Merge commit 'v2.6.36' into kbuild/misc

Update to be able to fix a recent change to scripts/basic/docproc.c
(commit eda603f).

.gitignore

@@ -35,13 +35,18 @@ modules.builtin
 #
 # Top-level generic files
 #
-tags
-TAGS
-vmlinux
-vmlinuz
-System.map
-Module.markers
-Module.symvers
+/tags
+/TAGS
+/linux
+/vmlinux
+/vmlinuz
+/System.map
+/Module.markers
+/Module.symvers
+
+#
+# git files that we don't want to ignore even it they are dot-files
+#
 !.gitignore
 !.mailmap
 

CREDITS

@@ -3554,12 +3554,12 @@ E: cvance@nai.com
 D: portions of the Linux Security Module (LSM) framework and security modules
 
 N: Petr Vandrovec
-E: vandrove@vc.cvut.cz
+E: petr@vandrovec.name
 D: Small contributions to ncpfs
 D: Matrox framebuffer driver
-S: Chudenicka 8
-S: 10200 Prague 10, Hostivar
-S: Czech Republic
+S: 21513 Conradia Ct
+S: Cupertino, CA 95014
+S: USA
 
 N: Thibaut Varene
 E: T-Bone@parisc-linux.org

Documentation/00-INDEX

@@ -32,8 +32,6 @@ DocBook/
 	- directory with DocBook templates etc. for kernel documentation.
 HOWTO
 	- the process and procedures of how to do Linux kernel development.
-IO-mapping.txt
-	- how to access I/O mapped memory from within device drivers.
 IPMI.txt
 	- info on Linux Intelligent Platform Management Interface (IPMI) Driver.
 IRQ-affinity.txt
@@ -84,6 +82,8 @@ blockdev/
 	- info on block devices & drivers
 btmrvl.txt
 	- info on Marvell Bluetooth driver usage.
+bus-virt-phys-mapping.txt
+	- how to access I/O mapped memory from within device drivers.
 cachetlb.txt
 	- describes the cache/TLB flushing interfaces Linux uses.
 cdrom/
@@ -130,8 +130,6 @@ edac.txt
 	- information on EDAC - Error Detection And Correction
 eisa.txt
 	- info on EISA bus support.
-exception.txt
-	- how Linux v2.2 handles exceptions without verify_area etc.
 fault-injection/
 	- dir with docs about the fault injection capabilities infrastructure.
 fb/
@@ -168,6 +166,8 @@ initrd.txt
 	- how to use the RAM disk as an initial/temporary root filesystem.
 input/
 	- info on Linux input device support.
+io-mapping.txt
+	- description of io_mapping functions in linux/io-mapping.h
 io_ordering.txt
 	- info on ordering I/O writes to memory-mapped addresses.
 ioctl/
@@ -232,6 +232,8 @@ memory.txt
 	- info on typical Linux memory problems.
 mips/
 	- directory with info about Linux on MIPS architecture.
+mmc/
+	- directory with info about the MMC subsystem
 mono.txt
 	- how to execute Mono-based .NET binaries with the help of BINFMT_MISC.
 mutex-design.txt
@@ -250,6 +252,8 @@ numastat.txt
 	- info on how to read Numa policy hit/miss statistics in sysfs.
 oops-tracing.txt
 	- how to decode those nasty internal kernel error dump messages.
+padata.txt
+	- An introduction to the "padata" parallel execution API
 parisc/
 	- directory with info on using Linux on PA-RISC architecture.
 parport.txt

Documentation/ABI/obsolete/sysfs-bus-usb

@@ -0,0 +1,31 @@
+What:		/sys/bus/usb/devices/.../power/level
+Date:		March 2007
+KernelVersion:	2.6.21
+Contact:	Alan Stern <stern@rowland.harvard.edu>
+Description:
+		Each USB device directory will contain a file named
+		power/level.  This file holds a power-level setting for
+		the device, either "on" or "auto".
+
+		"on" means that the device is not allowed to autosuspend,
+		although normal suspends for system sleep will still
+		be honored.  "auto" means the device will autosuspend
+		and autoresume in the usual manner, according to the
+		capabilities of its driver.
+
+		During normal use, devices should be left in the "auto"
+		level.  The "on" level is meant for administrative uses.
+		If you want to suspend a device immediately but leave it
+		free to wake up in response to I/O requests, you should
+		write "0" to power/autosuspend.
+
+		Device not capable of proper suspend and resume should be
+		left in the "on" level.  Although the USB spec requires
+		devices to support suspend/resume, many of them do not.
+		In fact so many don't that by default, the USB core
+		initializes all non-hub devices in the "on" level.  Some
+		drivers may change this setting when they are bound.
+
+		This file is deprecated and will be removed after 2010.
+		Use the power/control file instead; it does exactly the
+		same thing.

Documentation/ABI/obsolete/sysfs-class-rfkill

@@ -0,0 +1,29 @@
+rfkill - radio frequency (RF) connector kill switch support
+
+For details to this subsystem look at Documentation/rfkill.txt.
+
+What:		/sys/class/rfkill/rfkill[0-9]+/state
+Date:		09-Jul-2007
+KernelVersion	v2.6.22
+Contact:	linux-wireless@vger.kernel.org
+Description: 	Current state of the transmitter.
+		This file is deprecated and sheduled to be removed in 2014,
+		because its not possible to express the 'soft and hard block'
+		state of the rfkill driver.
+Values: 	A numeric value.
+		0: RFKILL_STATE_SOFT_BLOCKED
+			transmitter is turned off by software
+		1: RFKILL_STATE_UNBLOCKED
+			transmitter is (potentially) active
+		2: RFKILL_STATE_HARD_BLOCKED
+			transmitter is forced off by something outside of
+			the driver's control.
+
+What:		/sys/class/rfkill/rfkill[0-9]+/claim
+Date:		09-Jul-2007
+KernelVersion	v2.6.22
+Contact:	linux-wireless@vger.kernel.org
+Description:	This file is deprecated because there no longer is a way to
+		claim just control over a single rfkill instance.
+		This file is scheduled to be removed in 2012.
+Values: 	0: Kernel handles events

Documentation/ABI/stable/sysfs-class-rfkill

@@ -0,0 +1,67 @@
+rfkill - radio frequency (RF) connector kill switch support
+
+For details to this subsystem look at Documentation/rfkill.txt.
+
+For the deprecated /sys/class/rfkill/*/state and
+/sys/class/rfkill/*/claim knobs of this interface look in
+Documentation/ABI/obsolete/sysfs-class-rfkill.
+
+What: 		/sys/class/rfkill
+Date:		09-Jul-2007
+KernelVersion:	v2.6.22
+Contact:	linux-wireless@vger.kernel.org,
+Description: 	The rfkill class subsystem folder.
+		Each registered rfkill driver is represented by an rfkillX
+		subfolder (X being an integer > 0).
+
+
+What:		/sys/class/rfkill/rfkill[0-9]+/name
+Date:		09-Jul-2007
+KernelVersion	v2.6.22
+Contact:	linux-wireless@vger.kernel.org
+Description: 	Name assigned by driver to this key (interface or driver name).
+Values: 	arbitrary string.
+
+
+What: 		/sys/class/rfkill/rfkill[0-9]+/type
+Date:		09-Jul-2007
+KernelVersion	v2.6.22
+Contact:	linux-wireless@vger.kernel.org
+Description: 	Driver type string ("wlan", "bluetooth", etc).
+Values: 	See include/linux/rfkill.h.
+
+
+What:		/sys/class/rfkill/rfkill[0-9]+/persistent
+Date:		09-Jul-2007
+KernelVersion	v2.6.22
+Contact:	linux-wireless@vger.kernel.org
+Description: 	Whether the soft blocked state is initialised from non-volatile
+		storage at startup.
+Values: 	A numeric value.
+		0: false
+		1: true
+
+
+What:		/sys/class/rfkill/rfkill[0-9]+/hard
+Date:		12-March-2010
+KernelVersion	v2.6.34
+Contact:	linux-wireless@vger.kernel.org
+Description: 	Current hardblock state. This file is read only.
+Values: 	A numeric value.
+		0: inactive
+			The transmitter is (potentially) active.
+		1: active
+			The transmitter is forced off by something outside of
+			the driver's control.
+
+
+What:		/sys/class/rfkill/rfkill[0-9]+/soft
+Date:		12-March-2010
+KernelVersion	v2.6.34
+Contact:	linux-wireless@vger.kernel.org
+Description:	Current softblock state. This file is read and write.
+Values: 	A numeric value.
+		0: inactive
+			The transmitter is (potentially) active.
+		1: active
+			The transmitter is turned off by software.

Documentation/ABI/stable/sysfs-devices-node

@@ -0,0 +1,7 @@
+What:		/sys/devices/system/node/nodeX
+Date:		October 2002
+Contact:	Linux Memory Management list <linux-mm@kvack.org>
+Description:
+		When CONFIG_NUMA is enabled, this is a directory containing
+		information on node X such as what CPUs are local to the
+		node.

Documentation/ABI/testing/debugfs-ec

@@ -0,0 +1,20 @@
+What:		/sys/kernel/debug/ec/*/{gpe,use_global_lock,io}
+Date:		July 2010
+Contact:	Thomas Renninger <trenn@suse.de>
+Description:
+
+General information like which GPE is assigned to the EC and whether
+the global lock should get used.
+Knowing the EC GPE one can watch the amount of HW events related to
+the EC here (XY -> GPE number from /sys/kernel/debug/ec/*/gpe):
+/sys/firmware/acpi/interrupts/gpeXY
+
+The io file is binary and a userspace tool located here:
+ftp://ftp.suse.com/pub/people/trenn/sources/ec/
+should get used to read out the 256 Embedded Controller registers
+or writing to them.
+
+CAUTION: Do not write to the Embedded Controller if you don't know
+what you are doing! Rebooting afterwards also is a good idea.
+This can influence the way your machine is cooled and fans may
+not get switched on again after you did a wrong write.

Documentation/ABI/testing/debugfs-kmemtrace

@@ -1,71 +0,0 @@
-What:		/sys/kernel/debug/kmemtrace/
-Date:		July 2008
-Contact:	Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
-Description:
-
-In kmemtrace-enabled kernels, the following files are created:
-
-/sys/kernel/debug/kmemtrace/
-	cpu<n>		(0400)	Per-CPU tracing data, see below. (binary)
-	total_overruns	(0400)	Total number of bytes which were dropped from
-				cpu<n> files because of full buffer condition,
-				non-binary. (text)
-	abi_version	(0400)	Kernel's kmemtrace ABI version. (text)
-
-Each per-CPU file should be read according to the relay interface. That is,
-the reader should set affinity to that specific CPU and, as currently done by
-the userspace application (though there are other methods), use poll() with
-an infinite timeout before every read(). Otherwise, erroneous data may be
-read. The binary data has the following _core_ format:
-
-	Event ID	(1 byte)	Unsigned integer, one of:
-		0 - represents an allocation (KMEMTRACE_EVENT_ALLOC)
-		1 - represents a freeing of previously allocated memory
-		    (KMEMTRACE_EVENT_FREE)
-	Type ID		(1 byte)	Unsigned integer, one of:
-		0 - this is a kmalloc() / kfree()
-		1 - this is a kmem_cache_alloc() / kmem_cache_free()
-		2 - this is a __get_free_pages() et al.
-	Event size	(2 bytes)	Unsigned integer representing the
-					size of this event. Used to extend
-					kmemtrace. Discard the bytes you
-					don't know about.
-	Sequence number	(4 bytes)	Signed integer used to reorder data
-					logged on SMP machines. Wraparound
-					must be taken into account, although
-					it is unlikely.
-	Caller address	(8 bytes)	Return address to the caller.
-	Pointer to mem	(8 bytes)	Pointer to target memory area. Can be
-					NULL, but not all such calls might be
-					recorded.
-
-In case of KMEMTRACE_EVENT_ALLOC events, the next fields follow:
-
-	Requested bytes	(8 bytes)	Total number of requested bytes,
-					unsigned, must not be zero.
-	Allocated bytes (8 bytes)	Total number of actually allocated
-					bytes, unsigned, must not be lower
-					than requested bytes.
-	Requested flags	(4 bytes)	GFP flags supplied by the caller.
-	Target CPU	(4 bytes)	Signed integer, valid for event id 1.
-					If equal to -1, target CPU is the same
-					as origin CPU, but the reverse might
-					not be true.
-
-The data is made available in the same endianness the machine has.
-
-Other event ids and type ids may be defined and added. Other fields may be
-added by increasing event size, but see below for details.
-Every modification to the ABI, including new id definitions, are followed
-by bumping the ABI version by one.
-
-Adding new data to the packet (features) is done at the end of the mandatory
-data:
-	Feature size	(2 byte)
-	Feature ID	(1 byte)
-	Feature data	(Feature size - 3 bytes)
-
-
-Users:
-	kmemtrace-user - git://repo.or.cz/kmemtrace-user.git
-

Documentation/ABI/testing/ima_policy

@@ -20,7 +20,7 @@ Description:
 			lsm:	[[subj_user=] [subj_role=] [subj_type=]
 				 [obj_user=] [obj_role=] [obj_type=]]
 
-		base: 	func:= [BPRM_CHECK][FILE_MMAP][INODE_PERMISSION]
+		base: 	func:= [BPRM_CHECK][FILE_MMAP][FILE_CHECK]
 			mask:= [MAY_READ] [MAY_WRITE] [MAY_APPEND] [MAY_EXEC]
 			fsmagic:= hex value
 			uid:= decimal value
@@ -40,11 +40,11 @@ Description:
 
 			measure func=BPRM_CHECK
 			measure func=FILE_MMAP mask=MAY_EXEC
-			measure func=INODE_PERM mask=MAY_READ uid=0
+			measure func=FILE_CHECK mask=MAY_READ uid=0
 
 		The default policy measures all executables in bprm_check,
 		all files mmapped executable in file_mmap, and all files
-		open for read by root in inode_permission.
+		open for read by root in do_filp_open.
 
 		Examples of LSM specific definitions:
 
@@ -54,8 +54,8 @@ Description:
 
 			dont_measure obj_type=var_log_t
 			dont_measure obj_type=auditd_log_t
-			measure subj_user=system_u func=INODE_PERM mask=MAY_READ
-			measure subj_role=system_r func=INODE_PERM mask=MAY_READ
+			measure subj_user=system_u func=FILE_CHECK mask=MAY_READ
+			measure subj_role=system_r func=FILE_CHECK mask=MAY_READ
 
 		Smack:
-			measure subj_user=_ func=INODE_PERM mask=MAY_READ
+			measure subj_user=_ func=FILE_CHECK mask=MAY_READ

Documentation/ABI/testing/sysfs-block

@@ -128,3 +128,17 @@ Description:
 		preferred request size for workloads where sustained
 		throughput is desired.  If no optimal I/O size is
 		reported this file contains 0.
+
+What:		/sys/block/<disk>/queue/nomerges
+Date:		January 2010
+Contact:
+Description:
+		Standard I/O elevator operations include attempts to
+		merge contiguous I/Os. For known random I/O loads these
+		attempts will always fail and result in extra cycles
+		being spent in the kernel. This allows one to turn off
+		this behavior on one of two ways: When set to 1, complex
+		merge checks are disabled, but the simple one-shot merges
+		with the previous I/O request are enabled. When set to 2,
+		all merge tries are disabled. The default value is 0 -
+		which enables all types of merge tries.

Documentation/ABI/testing/sysfs-bus-i2c-devices-hm6352

@@ -0,0 +1,21 @@
+Where:		/sys/bus/i2c/devices/.../heading0_input
+Date:		April 2010
+Kernel Version: 2.6.36?
+Contact:	alan.cox@intel.com
+Description:	Reports the current heading from the compass as a floating
+		point value in degrees.
+
+Where:		/sys/bus/i2c/devices/.../power_state
+Date:		April 2010
+Kernel Version: 2.6.36?
+Contact:	alan.cox@intel.com
+Description:	Sets the power state of the device. 0 sets the device into
+		sleep mode, 1 wakes it up.
+
+Where:		/sys/bus/i2c/devices/.../calibration
+Date:		April 2010
+Kernel Version: 2.6.36?
+Contact:	alan.cox@intel.com
+Description:	Sets the calibration on or off (1 = on, 0 = off). See the
+		chip data sheet.
+

Documentation/ABI/testing/sysfs-bus-pci

@@ -139,3 +139,30 @@ Contact:	linux-pci@vger.kernel.org
 Description:
 		This symbolic link points to the PCI hotplug controller driver
 		module that manages the hotplug slot.
+
+What:		/sys/bus/pci/devices/.../label
+Date:		July 2010
+Contact:	Narendra K <narendra_k@dell.com>, linux-bugs@dell.com
+Description:
+		Reading this attribute will provide the firmware
+		given name(SMBIOS type 41 string) of the PCI device.
+		The attribute will be created only if the firmware
+		has given a name to the PCI device.
+Users:
+		Userspace applications interested in knowing the
+		firmware assigned name of the PCI device.
+
+What:		/sys/bus/pci/devices/.../index
+Date:		July 2010
+Contact:	Narendra K <narendra_k@dell.com>, linux-bugs@dell.com
+Description:
+		Reading this attribute will provide the firmware
+		given instance(SMBIOS type 41 device type instance)
+		of the PCI device. The attribute will be created
+		only if the firmware has given a device type instance
+		to the PCI device.
+Users:
+		Userspace applications interested in knowing the
+		firmware assigned device type instance of the PCI
+		device that can help in understanding the firmware
+		intended order of the PCI device.

Documentation/ABI/testing/sysfs-bus-usb

@@ -14,34 +14,6 @@ Description:
 		The autosuspend delay for newly-created devices is set to
 		the value of the usbcore.autosuspend module parameter.
 
-What:		/sys/bus/usb/devices/.../power/level
-Date:		March 2007
-KernelVersion:	2.6.21
-Contact:	Alan Stern <stern@rowland.harvard.edu>
-Description:
-		Each USB device directory will contain a file named
-		power/level.  This file holds a power-level setting for
-		the device, either "on" or "auto".
-
-		"on" means that the device is not allowed to autosuspend,
-		although normal suspends for system sleep will still
-		be honored.  "auto" means the device will autosuspend
-		and autoresume in the usual manner, according to the
-		capabilities of its driver.
-
-		During normal use, devices should be left in the "auto"
-		level.  The "on" level is meant for administrative uses.
-		If you want to suspend a device immediately but leave it
-		free to wake up in response to I/O requests, you should
-		write "0" to power/autosuspend.
-
-		Device not capable of proper suspend and resume should be
-		left in the "on" level.  Although the USB spec requires
-		devices to support suspend/resume, many of them do not.
-		In fact so many don't that by default, the USB core
-		initializes all non-hub devices in the "on" level.  Some
-		drivers may change this setting when they are bound.
-
 What:		/sys/bus/usb/devices/.../power/persist
 Date:		May 2007
 KernelVersion:	2.6.23
@@ -159,3 +131,14 @@ Description:
 		device.  This is useful to ensure auto probing won't
 		match the driver to the device.  For example:
 		# echo "046d c315" > /sys/bus/usb/drivers/foo/remove_id
+
+What:		/sys/bus/usb/device/.../avoid_reset_quirk
+Date:		December 2009
+Contact:	Oliver Neukum <oliver@neukum.org>
+Description:
+		Writing 1 to this file tells the kernel that this
+		device will morph into another mode when it is reset.
+		Drivers will not use reset for error handling for
+		such devices.
+Users:
+		usb_modeswitch

Documentation/ABI/testing/sysfs-class-power

@@ -0,0 +1,20 @@
+What:		/sys/class/power/ds2760-battery.*/charge_now
+Date:		May 2010
+KernelVersion:	2.6.35
+Contact:	Daniel Mack <daniel@caiaq.de>
+Description:
+		This file is writeable and can be used to set the current
+		coloumb counter value inside the battery monitor chip. This
+		is needed for unavoidable corrections of aging batteries.
+		A userspace daemon can monitor the battery charging logic
+		and once the counter drops out of considerable bounds, take
+		appropriate action.
+
+What:		/sys/class/power/ds2760-battery.*/charge_full
+Date:		May 2010
+KernelVersion:	2.6.35
+Contact:	Daniel Mack <daniel@caiaq.de>
+Description:
+		This file is writeable and can be used to set the assumed
+		battery 'full level'. As batteries age, this value has to be
+		amended over time.

Documentation/ABI/testing/sysfs-devices-memory

@@ -7,7 +7,7 @@ Description:
 		added or removed dynamically to represent hot-add/remove
 		operations.
 Users:		hotplug memory add/remove tools
-		https://w3.opensource.ibm.com/projects/powerpc-utils/
+		http://www.ibm.com/developerworks/wikis/display/LinuxP/powerpc-utils
 
 What:		/sys/devices/system/memory/memoryX/removable
 Date:		June 2008
@@ -19,7 +19,7 @@ Description:
 		identify removable sections of the memory before attempting
 		potentially expensive hot-remove memory operation
 Users:		hotplug memory remove tools
-		https://w3.opensource.ibm.com/projects/powerpc-utils/
+		http://www.ibm.com/developerworks/wikis/display/LinuxP/powerpc-utils	
 
 What:		/sys/devices/system/memory/memoryX/phys_device
 Date:		September 2008
@@ -43,7 +43,7 @@ Date:		September 2008
 Contact:	Badari Pulavarty <pbadari@us.ibm.com>
 Description:
 		The file /sys/devices/system/memory/memoryX/state
-		is read-write.  When read, it's contents show the
+		is read-write.  When read, its contents show the
 		online/offline state of the memory section.  When written,
 		root can toggle the the online/offline state of a removable
 		memory section (see removable file description above)
@@ -58,7 +58,7 @@ Description:
 		by root to offline that section.
 		# echo offline > /sys/devices/system/memory/memory22/state
 Users:		hotplug memory remove tools
-		https://w3.opensource.ibm.com/projects/powerpc-utils/
+		http://www.ibm.com/developerworks/wikis/display/LinuxP/powerpc-utils
 
 
 What:		/sys/devices/system/memoryX/nodeY

Documentation/ABI/testing/sysfs-devices-node

@@ -0,0 +1,7 @@
+What:		/sys/devices/system/node/nodeX/compact
+Date:		February 2010
+Contact:	Mel Gorman <mel@csn.ul.ie>
+Description:
+		When this file is written to, all memory within that node
+		will be compacted. When it completes, memory will be freed
+		into blocks which have as many contiguous pages as possible

Documentation/ABI/testing/sysfs-devices-platform-_UDC_-gadget

@@ -0,0 +1,21 @@
+What:		/sys/devices/platform/_UDC_/gadget/suspended
+Date:		April 2010
+Contact:	Fabien Chouteau <fabien.chouteau@barco.com>
+Description:
+		Show the suspend state of an USB composite gadget.
+		1 -> suspended
+		0 -> resumed
+
+		(_UDC_ is the name of the USB Device Controller driver)
+
+What:           /sys/devices/platform/_UDC_/gadget/gadget-lunX/nofua
+Date:           July 2010
+Contact:        Andy Shevchenko <andy.shevchenko@gmail.com>
+Description:
+		Show or set the reaction on the FUA (Force Unit Access) bit in
+		the SCSI WRITE(10,12) commands when a gadget in USB Mass
+		Storage mode.
+
+		Possible values are:
+			1 -> ignore the FUA flag
+			0 -> obey the FUA flag

Documentation/ABI/testing/sysfs-devices-power

@@ -0,0 +1,79 @@
+What:		/sys/devices/.../power/
+Date:		January 2009
+Contact:	Rafael J. Wysocki <rjw@sisk.pl>
+Description:
+		The /sys/devices/.../power directory contains attributes
+		allowing the user space to check and modify some power
+		management related properties of given device.
+
+What:		/sys/devices/.../power/wakeup
+Date:		January 2009
+Contact:	Rafael J. Wysocki <rjw@sisk.pl>
+Description:
+		The /sys/devices/.../power/wakeup attribute allows the user
+		space to check if the device is enabled to wake up the system
+		from sleep states, such as the memory sleep state (suspend to
+		RAM) and hibernation (suspend to disk), and to enable or disable
+		it to do that as desired.
+
+		Some devices support "wakeup" events, which are hardware signals
+		used to activate the system from a sleep state.  Such devices
+		have one of the following two values for the sysfs power/wakeup
+		file:
+
+		+ "enabled\n" to issue the events;
+		+ "disabled\n" not to do so;
+
+		In that cases the user space can change the setting represented
+		by the contents of this file by writing either "enabled", or
+		"disabled" to it.
+
+		For the devices that are not capable of generating system wakeup
+		events this file contains "\n".  In that cases the user space
+		cannot modify the contents of this file and the device cannot be
+		enabled to wake up the system.
+
+What:		/sys/devices/.../power/control
+Date:		January 2009
+Contact:	Rafael J. Wysocki <rjw@sisk.pl>
+Description:
+		The /sys/devices/.../power/control attribute allows the user
+		space to control the run-time power management of the device.
+
+		All devices have one of the following two values for the
+		power/control file:
+
+		+ "auto\n" to allow the device to be power managed at run time;
+		+ "on\n" to prevent the device from being power managed;
+
+		The default for all devices is "auto", which means that they may
+		be subject to automatic power management, depending on their
+		drivers.  Changing this attribute to "on" prevents the driver
+		from power managing the device at run time.  Doing that while
+		the device is suspended causes it to be woken up.
+
+What:		/sys/devices/.../power/async
+Date:		January 2009
+Contact:	Rafael J. Wysocki <rjw@sisk.pl>
+Description:
+		The /sys/devices/.../async attribute allows the user space to
+		enable or diasble the device's suspend and resume callbacks to
+		be executed asynchronously (ie. in separate threads, in parallel
+		with the main suspend/resume thread) during system-wide power
+		transitions (eg. suspend to RAM, hibernation).
+
+		All devices have one of the following two values for the
+		power/async file:
+
+		+ "enabled\n" to permit the asynchronous suspend/resume;
+		+ "disabled\n" to forbid it;
+
+		The value of this attribute may be changed by writing either
+		"enabled", or "disabled" to it.
+
+		It generally is unsafe to permit the asynchronous suspend/resume
+		of a device unless it is certain that all of the PM dependencies
+		of the device are known to the PM core.  However, for some
+		devices this attribute is set to "enabled" by bus type code or
+		device drivers and in that cases it should be safe to leave the
+		default value.

Documentation/ABI/testing/sysfs-devices-system-cpu

@@ -197,7 +197,7 @@ Description:	These files exist in every cpu's cache index directories.
 		Currently, only AMD Family 10h Processors support cache index
 		disable, and only for their L3 caches.  See the BIOS and
 		Kernel Developer's Guide at
-		http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/31116-Public-GH-BKDG_3.20_2-4-09.pdf
+		http://support.amd.com/us/Embedded_TechDocs/31116-Public-GH-BKDG_3-28_5-28-09.pdf	
 		for formatting information and other details on the
 		cache index disable.
 Users:    joachim.deguara@amd.com

Documentation/ABI/testing/sysfs-driver-hid-picolcd

@@ -0,0 +1,43 @@
+What:		/sys/bus/usb/devices/<busnum>-<devnum>:<config num>.<interface num>/<hid-bus>:<vendor-id>:<product-id>.<num>/operation_mode
+Date:		March 2010
+Contact:	Bruno Prémont <bonbons@linux-vserver.org>
+Description:	Make it possible to switch the PicoLCD device between LCD
+		(firmware) and bootloader (flasher) operation modes.
+
+		Reading: returns list of available modes, the active mode being
+		enclosed in brackets ('[' and ']')
+
+		Writing: causes operation mode switch. Permitted values are
+		the non-active mode names listed when read.
+
+		Note: when switching mode the current PicoLCD HID device gets
+		disconnected and reconnects after above delay (see attribute
+		operation_mode_delay for its value).
+
+
+What:		/sys/bus/usb/devices/<busnum>-<devnum>:<config num>.<interface num>/<hid-bus>:<vendor-id>:<product-id>.<num>/operation_mode_delay
+Date:		April 2010
+Contact:	Bruno Prémont <bonbons@linux-vserver.org>
+Description:	Delay PicoLCD waits before restarting in new mode when
+		operation_mode has changed.
+
+		Reading/Writing: It is expressed in ms and permitted range is
+		0..30000ms.
+
+
+What:		/sys/bus/usb/devices/<busnum>-<devnum>:<config num>.<interface num>/<hid-bus>:<vendor-id>:<product-id>.<num>/fb_update_rate
+Date:		March 2010
+Contact:	Bruno Prémont <bonbons@linux-vserver.org>
+Description:	Make it possible to adjust defio refresh rate.
+
+		Reading: returns list of available refresh rates (expressed in Hz),
+		the active refresh rate being enclosed in brackets ('[' and ']')
+
+		Writing: accepts new refresh rate expressed in integer Hz
+		within permitted rates.
+
+		Note: As device can barely do 2 complete refreshes a second
+		it only makes sense to adjust this value if only one or two
+		tiles get changed and it's not appropriate to expect the application
+		to flush it's tiny changes explicitely at higher than default rate.
+

Documentation/ABI/testing/sysfs-driver-hid-prodikeys

@@ -0,0 +1,29 @@
+What:		/sys/bus/hid/drivers/prodikeys/.../channel
+Date:		April 2010
+KernelVersion:	2.6.34
+Contact:	Don Prince <dhprince.devel@yahoo.co.uk>
+Description:
+		Allows control (via software) the midi channel to which
+		that the pc-midi keyboard will output.midi data.
+		Range: 0..15
+		Type:  Read/write
+What:		/sys/bus/hid/drivers/prodikeys/.../sustain
+Date:		April 2010
+KernelVersion:	2.6.34
+Contact:	Don Prince <dhprince.devel@yahoo.co.uk>
+Description:
+		Allows control (via software) the sustain duration of a
+		note held by the pc-midi driver.
+		0 means sustain mode is disabled.
+		Range: 0..5000 (milliseconds)
+		Type:  Read/write
+What:		/sys/bus/hid/drivers/prodikeys/.../octave
+Date:		April 2010
+KernelVersion:	2.6.34
+Contact:	Don Prince <dhprince.devel@yahoo.co.uk>
+Description:
+		Controls the octave shift modifier in the pc-midi driver.
+		The octave can be shifted via software up/down 2 octaves.
+		0 means the no ocatve shift.
+		Range: -2..2 (minus 2 to plus 2)
+		Type: Read/Write

Documentation/ABI/testing/sysfs-driver-hid-roccat-kone

@@ -0,0 +1,98 @@
+What:		/sys/bus/usb/devices/<busnum>-<devnum>:<config num>.<interface num>/actual_dpi
+Date:		March 2010
+Contact:	Stefan Achatz <erazor_de@users.sourceforge.net>
+Description:	It is possible to switch the dpi setting of the mouse with the
+		press of a button.
+		When read, this file returns the raw number of the actual dpi
+		setting reported by the mouse. This number has to be further
+		processed to receive the real dpi value.
+
+		VALUE DPI
+		1     800
+		2     1200
+		3     1600
+		4     2000
+		5     2400
+		6     3200
+
+		This file is readonly.
+
+What:		/sys/bus/usb/devices/<busnum>-<devnum>:<config num>.<interface num>/actual_profile
+Date:		March 2010
+Contact:	Stefan Achatz <erazor_de@users.sourceforge.net>
+Description:	When read, this file returns the number of the actual profile.
+		This file is readonly.
+
+What:		/sys/bus/usb/devices/<busnum>-<devnum>:<config num>.<interface num>/firmware_version
+Date:		March 2010
+Contact:	Stefan Achatz <erazor_de@users.sourceforge.net>
+Description:	When read, this file returns the raw integer version number of the
+		firmware reported by the mouse. Using the integer value eases
+		further usage in other programs. To receive the real version
+		number the decimal point has to be shifted 2 positions to the
+		left. E.g. a returned value of 138 means 1.38
+		This file is readonly.
+
+What:		/sys/bus/usb/devices/<busnum>-<devnum>:<config num>.<interface num>/profile[1-5]
+Date:		March 2010
+Contact:	Stefan Achatz <erazor_de@users.sourceforge.net>
+Description:	The mouse can store 5 profiles which can be switched by the
+                press of a button. A profile holds informations like button
+                mappings, sensitivity, the colors of the 5 leds and light
+                effects.
+                When read, these files return the respective profile. The
+                returned data is 975 bytes in size.
+		When written, this file lets one write the respective profile
+		data back to the mouse. The data has to be 975 bytes long.
+		The mouse will reject invalid data, whereas the profile number
+		stored in the profile doesn't need to fit the number of the
+		store.
+
+What:		/sys/bus/usb/devices/<busnum>-<devnum>:<config num>.<interface num>/settings
+Date:		March 2010
+Contact:	Stefan Achatz <erazor_de@users.sourceforge.net>
+Description:	When read, this file returns the settings stored in the mouse.
+		The size of the data is 36 bytes and holds information like the
+		startup_profile, tcu state and calibration_data.
+		When written, this file lets write settings back to the mouse.
+		The data has to be 36 bytes long. The mouse will reject invalid
+		data.
+
+What:		/sys/bus/usb/devices/<busnum>-<devnum>:<config num>.<interface num>/startup_profile
+Date:		March 2010
+Contact:	Stefan Achatz <erazor_de@users.sourceforge.net>
+Description:	The integer value of this attribute ranges from 1 to 5.
+                When read, this attribute returns the number of the profile
+                that's active when the mouse is powered on.
+		When written, this file sets the number of the startup profile
+		and the mouse activates this profile immediately.
+
+What:		/sys/bus/usb/devices/<busnum>-<devnum>:<config num>.<interface num>/tcu
+Date:		March 2010
+Contact:	Stefan Achatz <erazor_de@users.sourceforge.net>
+Description:	The mouse has a "Tracking Control Unit" which lets the user
+		calibrate the laser power to fit the mousepad surface.
+		When read, this file returns the current state of the TCU,
+		where 0 means off and 1 means on.
+		Writing 0 in this file will switch the TCU off.
+		Writing 1 in this file will start the calibration which takes
+		around 6 seconds to complete and activates the TCU.
+
+What:		/sys/bus/usb/devices/<busnum>-<devnum>:<config num>.<interface num>/weight
+Date:		March 2010
+Contact:	Stefan Achatz <erazor_de@users.sourceforge.net>
+Description:	The mouse can be equipped with one of four supplied weights
+		ranging from 5 to 20 grams which are recognized by the mouse
+		and its value can be read out. When read, this file returns the
+		raw value returned by the mouse which eases further processing
+		in other software.
+		The values map to the weights as follows:
+
+		VALUE WEIGHT
+		0     none
+		1     5g
+		2     10g
+		3     15g
+		4     20g
+
+		This file is readonly.

Documentation/ABI/testing/sysfs-firmware-sfi

@@ -0,0 +1,15 @@
+What:		/sys/firmware/sfi/tables/
+Date:		May 2010
+Contact:	Len Brown <lenb@kernel.org>
+Description:
+		SFI defines a number of small static memory tables
+		so the kernel can get platform information from firmware.
+
+		The tables are defined in the latest SFI specification:
+		http://simplefirmware.org/documentation
+
+		While the tables are used by the kernel, user-space
+		can observe them this way:
+
+		# cd /sys/firmware/sfi/tables
+		# cat $TABLENAME > $TABLENAME.bin

Documentation/ABI/testing/sysfs-i2c-bmp085

@@ -0,0 +1,31 @@
+What:		/sys/bus/i2c/devices/<busnum>-<devaddr>/pressure0_input
+Date:		June 2010
+Contact:	Christoph Mair <christoph.mair@gmail.com>
+Description:	Start a pressure measurement and read the result. Values
+		represent the ambient air pressure in pascal (0.01 millibar).
+
+		Reading: returns the current air pressure.
+
+
+What:		/sys/bus/i2c/devices/<busnum>-<devaddr>/temp0_input
+Date:		June 2010
+Contact:	Christoph Mair <christoph.mair@gmail.com>
+Description:	Measure the ambient temperature. The returned value represents
+		the ambient temperature in units of 0.1 degree celsius.
+
+		Reading: returns the current temperature.
+
+
+What:		/sys/bus/i2c/devices/<busnum>-<devaddr>/oversampling
+Date:		June 2010
+Contact:	Christoph Mair <christoph.mair@gmail.com>
+Description:	Tell the bmp085 to use more samples to calculate a pressure
+		value. When writing to this file the chip will use 2^x samples
+		to calculate the next pressure value with x being the value
+		written. Using this feature will decrease RMS noise and
+		increase the measurement time.
+
+		Reading: returns the current oversampling setting.
+
+		Writing: sets a new oversampling setting.
+		Accepted values: 0..3.

Documentation/ABI/testing/sysfs-platform-asus-laptop

@@ -1,4 +1,4 @@
-What:		/sys/devices/platform/asus-laptop/display
+What:		/sys/devices/platform/asus_laptop/display
 Date:		January 2007
 KernelVersion:	2.6.20
 Contact:	"Corentin Chary" <corentincj@iksaif.net>
@@ -13,7 +13,7 @@ Description:
 		Ex: - 0 (0000b) means no display
 		    - 3 (0011b) CRT+LCD.
 
-What:		/sys/devices/platform/asus-laptop/gps
+What:		/sys/devices/platform/asus_laptop/gps
 Date:		January 2007
 KernelVersion:	2.6.20
 Contact:	"Corentin Chary" <corentincj@iksaif.net>
@@ -21,7 +21,7 @@ Description:
 		Control the gps device. 1 means on, 0 means off.
 Users:		Lapsus
 
-What:		/sys/devices/platform/asus-laptop/ledd
+What:		/sys/devices/platform/asus_laptop/ledd
 Date:		January 2007
 KernelVersion:	2.6.20
 Contact:	"Corentin Chary" <corentincj@iksaif.net>
@@ -29,11 +29,11 @@ Description:
 		Some models like the W1N have a LED display that can be
 		used to display several informations.
 		To control the LED display, use the following :
-		    echo 0x0T000DDD > /sys/devices/platform/asus-laptop/
+		    echo 0x0T000DDD > /sys/devices/platform/asus_laptop/
 		where T control the 3 letters display, and DDD the 3 digits display.
 		The DDD table can be found in Documentation/laptops/asus-laptop.txt
 
-What:		/sys/devices/platform/asus-laptop/bluetooth
+What:		/sys/devices/platform/asus_laptop/bluetooth
 Date:		January 2007
 KernelVersion:	2.6.20
 Contact:	"Corentin Chary" <corentincj@iksaif.net>
@@ -42,7 +42,7 @@ Description:
 		This may control the led, the device or both.
 Users:		Lapsus
 
-What:		/sys/devices/platform/asus-laptop/wlan
+What:		/sys/devices/platform/asus_laptop/wlan
 Date:		January 2007
 KernelVersion:	2.6.20
 Contact:	"Corentin Chary" <corentincj@iksaif.net>

Documentation/ABI/testing/sysfs-platform-eeepc-laptop

@@ -1,4 +1,4 @@
-What:		/sys/devices/platform/eeepc-laptop/disp
+What:		/sys/devices/platform/eeepc/disp
 Date:		May 2008
 KernelVersion:	2.6.26
 Contact:	"Corentin Chary" <corentincj@iksaif.net>
@@ -9,21 +9,21 @@ Description:
 		- 3 = LCD+CRT
 		If you run X11, you should use xrandr instead.
 
-What:		/sys/devices/platform/eeepc-laptop/camera
+What:		/sys/devices/platform/eeepc/camera
 Date:		May 2008
 KernelVersion:	2.6.26
 Contact:	"Corentin Chary" <corentincj@iksaif.net>
 Description:
 		Control the camera. 1 means on, 0 means off.
 
-What:		/sys/devices/platform/eeepc-laptop/cardr
+What:		/sys/devices/platform/eeepc/cardr
 Date:		May 2008
 KernelVersion:	2.6.26
 Contact:	"Corentin Chary" <corentincj@iksaif.net>
 Description:
 		Control the card reader. 1 means on, 0 means off.
 
-What:		/sys/devices/platform/eeepc-laptop/cpufv
+What:		/sys/devices/platform/eeepc/cpufv
 Date:		Jun 2009
 KernelVersion:	2.6.31
 Contact:	"Corentin Chary" <corentincj@iksaif.net>
@@ -42,7 +42,7 @@ Description:
 		    `------------ Availables modes
 		For example, 0x301 means: mode 1 selected, 3 available modes.
 
-What:		/sys/devices/platform/eeepc-laptop/available_cpufv
+What:		/sys/devices/platform/eeepc/available_cpufv
 Date:		Jun 2009
 KernelVersion:	2.6.31
 Contact:	"Corentin Chary" <corentincj@iksaif.net>

Documentation/ABI/testing/sysfs-power

@@ -101,3 +101,31 @@ Description:
 
 		CAUTION: Using it will cause your machine's real-time (CMOS)
 		clock to be set to a random invalid time after a resume.
+
+What:		/sys/power/pm_async
+Date:		January 2009
+Contact:	Rafael J. Wysocki <rjw@sisk.pl>
+Description:
+		The /sys/power/pm_async file controls the switch allowing the
+		user space to enable or disable asynchronous suspend and resume
+		of devices.  If enabled, this feature will cause some device
+		drivers' suspend and resume callbacks to be executed in parallel
+		with each other and with the main suspend thread.  It is enabled
+		if this file contains "1", which is the default.  It may be
+		disabled by writing "0" to this file, in which case all devices
+		will be suspended and resumed synchronously.
+
+What:		/sys/power/wakeup_count
+Date:		July 2010
+Contact:	Rafael J. Wysocki <rjw@sisk.pl>
+Description:
+		The /sys/power/wakeup_count file allows user space to put the
+		system into a sleep state while taking into account the
+		concurrent arrival of wakeup events.  Reading from it returns
+		the current number of registered wakeup events and it blocks if
+		some wakeup events are being processed at the time the file is
+		read from.  Writing to it will only succeed if the current
+		number of wakeup events is equal to the written value and, if
+		successful, will make the kernel abort a subsequent transition
+		to a sleep state if any wakeup events are reported after the
+		write has returned.

Documentation/ABI/testing/sysfs-wacom

@@ -0,0 +1,10 @@
+What:		/sys/class/hidraw/hidraw*/device/speed
+Date:		April 2010
+Kernel Version:	2.6.35
+Contact:	linux-bluetooth@vger.kernel.org
+Description:
+		The /sys/class/hidraw/hidraw*/device/speed file controls
+		reporting speed of wacom bluetooth tablet. Reading from
+		this file returns 1 if tablet reports in high speed mode
+		or 0 otherwise. Writing to this file one of these values
+		switches reporting speed.

Documentation/Changes

@@ -49,7 +49,7 @@ o  oprofile               0.9                     # oprofiled --version
 o  udev                   081                     # udevinfo -V
 o  grub                   0.93                    # grub --version
 o  mcelog		  0.6
-o  iptables               1.4.1                   # iptables -V
+o  iptables               1.4.2                   # iptables -V
 
 
 Kernel compilation
@@ -331,7 +331,7 @@ o  <ftp://ftp.kernel.org/pub/linux/kernel/people/rusty/modules/>
 
 Mkinitrd
 --------
-o  <ftp://rawhide.redhat.com/pub/rawhide/SRPMS/SRPMS/>
+o  <https://code.launchpad.net/initrd-tools/main>
 
 E2fsprogs
 ---------
@@ -343,11 +343,11 @@ o  <http://jfs.sourceforge.net/>
 
 Reiserfsprogs
 -------------
-o  <http://www.namesys.com/pub/reiserfsprogs/reiserfsprogs-3.6.3.tar.gz>
+o  <http://www.kernel.org/pub/linux/utils/fs/reiserfs/>
 
 Xfsprogs
 --------
-o  <ftp://oss.sgi.com/projects/xfs/download/>
+o  <ftp://oss.sgi.com/projects/xfs/>
 
 Pcmciautils
 -----------
@@ -387,18 +387,18 @@ o <http://sourceforge.net/projects/fuse>
 
 mcelog
 ------
-o <ftp://ftp.kernel.org/pub/linux/utils/cpu/mce/mcelog/>
+o <ftp://ftp.kernel.org/pub/linux/utils/cpu/mce/>
 
 Networking
 **********
 
 PPP
 ---
-o  <ftp://ftp.samba.org/pub/ppp/ppp-2.4.0.tar.gz>
+o  <ftp://ftp.samba.org/pub/ppp/>
 
 Isdn4k-utils
 ------------
-o  <ftp://ftp.isdn4linux.de/pub/isdn4linux/utils/isdn4k-utils.v3.1pre1.tar.gz>
+o  <ftp://ftp.isdn4linux.de/pub/isdn4linux/utils/>
 
 NFS-utils
 ---------

Documentation/DMA-API-HOWTO.txt

@@ -0,0 +1,781 @@
+		     Dynamic DMA mapping Guide
+		     =========================
+
+		 David S. Miller <davem@redhat.com>
+		 Richard Henderson <rth@cygnus.com>
+		  Jakub Jelinek <jakub@redhat.com>
+
+This is a guide to device driver writers on how to use the DMA API
+with example pseudo-code.  For a concise description of the API, see
+DMA-API.txt.
+
+Most of the 64bit platforms have special hardware that translates bus
+addresses (DMA addresses) into physical addresses.  This is similar to
+how page tables and/or a TLB translates virtual addresses to physical
+addresses on a CPU.  This is needed so that e.g. PCI devices can
+access with a Single Address Cycle (32bit DMA address) any page in the
+64bit physical address space.  Previously in Linux those 64bit
+platforms had to set artificial limits on the maximum RAM size in the
+system, so that the virt_to_bus() static scheme works (the DMA address
+translation tables were simply filled on bootup to map each bus
+address to the physical page __pa(bus_to_virt())).
+
+So that Linux can use the dynamic DMA mapping, it needs some help from the
+drivers, namely it has to take into account that DMA addresses should be
+mapped only for the time they are actually used and unmapped after the DMA
+transfer.
+
+The following API will work of course even on platforms where no such
+hardware exists.
+
+Note that the DMA API works with any bus independent of the underlying
+microprocessor architecture. You should use the DMA API rather than
+the bus specific DMA API (e.g. pci_dma_*).
+
+First of all, you should make sure
+
+#include <linux/dma-mapping.h>
+
+is in your driver. This file will obtain for you the definition of the
+dma_addr_t (which can hold any valid DMA address for the platform)
+type which should be used everywhere you hold a DMA (bus) address
+returned from the DMA mapping functions.
+
+			 What memory is DMA'able?
+
+The first piece of information you must know is what kernel memory can
+be used with the DMA mapping facilities.  There has been an unwritten
+set of rules regarding this, and this text is an attempt to finally
+write them down.
+
+If you acquired your memory via the page allocator
+(i.e. __get_free_page*()) or the generic memory allocators
+(i.e. kmalloc() or kmem_cache_alloc()) then you may DMA to/from
+that memory using the addresses returned from those routines.
+
+This means specifically that you may _not_ use the memory/addresses
+returned from vmalloc() for DMA.  It is possible to DMA to the
+_underlying_ memory mapped into a vmalloc() area, but this requires
+walking page tables to get the physical addresses, and then
+translating each of those pages back to a kernel address using
+something like __va().  [ EDIT: Update this when we integrate
+Gerd Knorr's generic code which does this. ]
+
+This rule also means that you may use neither kernel image addresses
+(items in data/text/bss segments), nor module image addresses, nor
+stack addresses for DMA.  These could all be mapped somewhere entirely
+different than the rest of physical memory.  Even if those classes of
+memory could physically work with DMA, you'd need to ensure the I/O
+buffers were cacheline-aligned.  Without that, you'd see cacheline
+sharing problems (data corruption) on CPUs with DMA-incoherent caches.
+(The CPU could write to one word, DMA would write to a different one
+in the same cache line, and one of them could be overwritten.)
+
+Also, this means that you cannot take the return of a kmap()
+call and DMA to/from that.  This is similar to vmalloc().
+
+What about block I/O and networking buffers?  The block I/O and
+networking subsystems make sure that the buffers they use are valid
+for you to DMA from/to.
+
+			DMA addressing limitations
+
+Does your device have any DMA addressing limitations?  For example, is
+your device only capable of driving the low order 24-bits of address?
+If so, you need to inform the kernel of this fact.
+
+By default, the kernel assumes that your device can address the full
+32-bits.  For a 64-bit capable device, this needs to be increased.
+And for a device with limitations, as discussed in the previous
+paragraph, it needs to be decreased.
+
+Special note about PCI: PCI-X specification requires PCI-X devices to
+support 64-bit addressing (DAC) for all transactions.  And at least
+one platform (SGI SN2) requires 64-bit consistent allocations to
+operate correctly when the IO bus is in PCI-X mode.
+
+For correct operation, you must interrogate the kernel in your device
+probe routine to see if the DMA controller on the machine can properly
+support the DMA addressing limitation your device has.  It is good
+style to do this even if your device holds the default setting,
+because this shows that you did think about these issues wrt. your
+device.
+
+The query is performed via a call to dma_set_mask():
+
+	int dma_set_mask(struct device *dev, u64 mask);
+
+The query for consistent allocations is performed via a call to
+dma_set_coherent_mask():
+
+	int dma_set_coherent_mask(struct device *dev, u64 mask);
+
+Here, dev is a pointer to the device struct of your device, and mask
+is a bit mask describing which bits of an address your device
+supports.  It returns zero if your card can perform DMA properly on
+the machine given the address mask you provided.  In general, the
+device struct of your device is embedded in the bus specific device
+struct of your device.  For example, a pointer to the device struct of
+your PCI device is pdev->dev (pdev is a pointer to the PCI device
+struct of your device).
+
+If it returns non-zero, your device cannot perform DMA properly on
+this platform, and attempting to do so will result in undefined
+behavior.  You must either use a different mask, or not use DMA.
+
+This means that in the failure case, you have three options:
+
+1) Use another DMA mask, if possible (see below).
+2) Use some non-DMA mode for data transfer, if possible.
+3) Ignore this device and do not initialize it.
+
+It is recommended that your driver print a kernel KERN_WARNING message
+when you end up performing either #2 or #3.  In this manner, if a user
+of your driver reports that performance is bad or that the device is not
+even detected, you can ask them for the kernel messages to find out
+exactly why.
+
+The standard 32-bit addressing device would do something like this:
+
+	if (dma_set_mask(dev, DMA_BIT_MASK(32))) {
+		printk(KERN_WARNING
+		       "mydev: No suitable DMA available.\n");
+		goto ignore_this_device;
+	}
+
+Another common scenario is a 64-bit capable device.  The approach here
+is to try for 64-bit addressing, but back down to a 32-bit mask that
+should not fail.  The kernel may fail the 64-bit mask not because the
+platform is not capable of 64-bit addressing.  Rather, it may fail in
+this case simply because 32-bit addressing is done more efficiently
+than 64-bit addressing.  For example, Sparc64 PCI SAC addressing is
+more efficient than DAC addressing.
+
+Here is how you would handle a 64-bit capable device which can drive
+all 64-bits when accessing streaming DMA:
+
+	int using_dac;
+
+	if (!dma_set_mask(dev, DMA_BIT_MASK(64))) {
+		using_dac = 1;
+	} else if (!dma_set_mask(dev, DMA_BIT_MASK(32))) {
+		using_dac = 0;
+	} else {
+		printk(KERN_WARNING
+		       "mydev: No suitable DMA available.\n");
+		goto ignore_this_device;
+	}
+
+If a card is capable of using 64-bit consistent allocations as well,
+the case would look like this:
+
+	int using_dac, consistent_using_dac;
+
+	if (!dma_set_mask(dev, DMA_BIT_MASK(64))) {
+		using_dac = 1;
+	   	consistent_using_dac = 1;
+		dma_set_coherent_mask(dev, DMA_BIT_MASK(64));
+	} else if (!dma_set_mask(dev, DMA_BIT_MASK(32))) {
+		using_dac = 0;
+		consistent_using_dac = 0;
+		dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
+	} else {
+		printk(KERN_WARNING
+		       "mydev: No suitable DMA available.\n");
+		goto ignore_this_device;
+	}
+
+dma_set_coherent_mask() will always be able to set the same or a
+smaller mask as dma_set_mask(). However for the rare case that a
+device driver only uses consistent allocations, one would have to
+check the return value from dma_set_coherent_mask().
+
+Finally, if your device can only drive the low 24-bits of
+address you might do something like:
+
+	if (dma_set_mask(dev, DMA_BIT_MASK(24))) {
+		printk(KERN_WARNING
+		       "mydev: 24-bit DMA addressing not available.\n");
+		goto ignore_this_device;
+	}
+
+When dma_set_mask() is successful, and returns zero, the kernel saves
+away this mask you have provided.  The kernel will use this
+information later when you make DMA mappings.
+
+There is a case which we are aware of at this time, which is worth
+mentioning in this documentation.  If your device supports multiple
+functions (for example a sound card provides playback and record
+functions) and the various different functions have _different_
+DMA addressing limitations, you may wish to probe each mask and
+only provide the functionality which the machine can handle.  It
+is important that the last call to dma_set_mask() be for the
+most specific mask.
+
+Here is pseudo-code showing how this might be done:
+
+	#define PLAYBACK_ADDRESS_BITS	DMA_BIT_MASK(32)
+	#define RECORD_ADDRESS_BITS	DMA_BIT_MASK(24)
+
+	struct my_sound_card *card;
+	struct device *dev;
+
+	...
+	if (!dma_set_mask(dev, PLAYBACK_ADDRESS_BITS)) {
+		card->playback_enabled = 1;
+	} else {
+		card->playback_enabled = 0;
+		printk(KERN_WARNING "%s: Playback disabled due to DMA limitations.\n",
+		       card->name);
+	}
+	if (!dma_set_mask(dev, RECORD_ADDRESS_BITS)) {
+		card->record_enabled = 1;
+	} else {
+		card->record_enabled = 0;
+		printk(KERN_WARNING "%s: Record disabled due to DMA limitations.\n",
+		       card->name);
+	}
+
+A sound card was used as an example here because this genre of PCI
+devices seems to be littered with ISA chips given a PCI front end,
+and thus retaining the 16MB DMA addressing limitations of ISA.
+
+			Types of DMA mappings
+
+There are two types of DMA mappings:
+
+- Consistent DMA mappings which are usually mapped at driver
+  initialization, unmapped at the end and for which the hardware should
+  guarantee that the device and the CPU can access the data
+  in parallel and will see updates made by each other without any
+  explicit software flushing.
+
+  Think of "consistent" as "synchronous" or "coherent".
+
+  The current default is to return consistent memory in the low 32
+  bits of the bus space.  However, for future compatibility you should
+  set the consistent mask even if this default is fine for your
+  driver.
+
+  Good examples of what to use consistent mappings for are:
+
+	- Network card DMA ring descriptors.
+	- SCSI adapter mailbox command data structures.
+	- Device firmware microcode executed out of
+	  main memory.
+
+  The invariant these examples all require is that any CPU store
+  to memory is immediately visible to the device, and vice
+  versa.  Consistent mappings guarantee this.
+
+  IMPORTANT: Consistent DMA memory does not preclude the usage of
+             proper memory barriers.  The CPU may reorder stores to
+	     consistent memory just as it may normal memory.  Example:
+	     if it is important for the device to see the first word
+	     of a descriptor updated before the second, you must do
+	     something like:
+
+		desc->word0 = address;
+		wmb();
+		desc->word1 = DESC_VALID;
+
+             in order to get correct behavior on all platforms.
+
+	     Also, on some platforms your driver may need to flush CPU write
+	     buffers in much the same way as it needs to flush write buffers
+	     found in PCI bridges (such as by reading a register's value
+	     after writing it).
+
+- Streaming DMA mappings which are usually mapped for one DMA
+  transfer, unmapped right after it (unless you use dma_sync_* below)
+  and for which hardware can optimize for sequential accesses.
+
+  This of "streaming" as "asynchronous" or "outside the coherency
+  domain".
+
+  Good examples of what to use streaming mappings for are:
+
+	- Networking buffers transmitted/received by a device.
+	- Filesystem buffers written/read by a SCSI device.
+
+  The interfaces for using this type of mapping were designed in
+  such a way that an implementation can make whatever performance
+  optimizations the hardware allows.  To this end, when using
+  such mappings you must be explicit about what you want to happen.
+
+Neither type of DMA mapping has alignment restrictions that come from
+the underlying bus, although some devices may have such restrictions.
+Also, systems with caches that aren't DMA-coherent will work better
+when the underlying buffers don't share cache lines with other data.
+
+
+		 Using Consistent DMA mappings.
+
+To allocate and map large (PAGE_SIZE or so) consistent DMA regions,
+you should do:
+
+	dma_addr_t dma_handle;
+
+	cpu_addr = dma_alloc_coherent(dev, size, &dma_handle, gfp);
+
+where device is a struct device *. This may be called in interrupt
+context with the GFP_ATOMIC flag.
+
+Size is the length of the region you want to allocate, in bytes.
+
+This routine will allocate RAM for that region, so it acts similarly to
+__get_free_pages (but takes size instead of a page order).  If your
+driver needs regions sized smaller than a page, you may prefer using
+the dma_pool interface, described below.
+
+The consistent DMA mapping interfaces, for non-NULL dev, will by
+default return a DMA address which is 32-bit addressable.  Even if the
+device indicates (via DMA mask) that it may address the upper 32-bits,
+consistent allocation will only return > 32-bit addresses for DMA if
+the consistent DMA mask has been explicitly changed via
+dma_set_coherent_mask().  This is true of the dma_pool interface as
+well.
+
+dma_alloc_coherent returns two values: the virtual address which you
+can use to access it from the CPU and dma_handle which you pass to the
+card.
+
+The cpu return address and the DMA bus master address are both
+guaranteed to be aligned to the smallest PAGE_SIZE order which
+is greater than or equal to the requested size.  This invariant
+exists (for example) to guarantee that if you allocate a chunk
+which is smaller than or equal to 64 kilobytes, the extent of the
+buffer you receive will not cross a 64K boundary.
+
+To unmap and free such a DMA region, you call:
+
+	dma_free_coherent(dev, size, cpu_addr, dma_handle);
+
+where dev, size are the same as in the above call and cpu_addr and
+dma_handle are the values dma_alloc_coherent returned to you.
+This function may not be called in interrupt context.
+
+If your driver needs lots of smaller memory regions, you can write
+custom code to subdivide pages returned by dma_alloc_coherent,
+or you can use the dma_pool API to do that.  A dma_pool is like
+a kmem_cache, but it uses dma_alloc_coherent not __get_free_pages.
+Also, it understands common hardware constraints for alignment,
+like queue heads needing to be aligned on N byte boundaries.
+
+Create a dma_pool like this:
+
+	struct dma_pool *pool;
+
+	pool = dma_pool_create(name, dev, size, align, alloc);
+
+The "name" is for diagnostics (like a kmem_cache name); dev and size
+are as above.  The device's hardware alignment requirement for this
+type of data is "align" (which is expressed in bytes, and must be a
+power of two).  If your device has no boundary crossing restrictions,
+pass 0 for alloc; passing 4096 says memory allocated from this pool
+must not cross 4KByte boundaries (but at that time it may be better to
+go for dma_alloc_coherent directly instead).
+
+Allocate memory from a dma pool like this:
+
+	cpu_addr = dma_pool_alloc(pool, flags, &dma_handle);
+
+flags are SLAB_KERNEL if blocking is permitted (not in_interrupt nor
+holding SMP locks), SLAB_ATOMIC otherwise.  Like dma_alloc_coherent,
+this returns two values, cpu_addr and dma_handle.
+
+Free memory that was allocated from a dma_pool like this:
+
+	dma_pool_free(pool, cpu_addr, dma_handle);
+
+where pool is what you passed to dma_pool_alloc, and cpu_addr and
+dma_handle are the values dma_pool_alloc returned. This function
+may be called in interrupt context.
+
+Destroy a dma_pool by calling:
+
+	dma_pool_destroy(pool);
+
+Make sure you've called dma_pool_free for all memory allocated
+from a pool before you destroy the pool. This function may not
+be called in interrupt context.
+
+			DMA Direction
+
+The interfaces described in subsequent portions of this document
+take a DMA direction argument, which is an integer and takes on
+one of the following values:
+
+ DMA_BIDIRECTIONAL
+ DMA_TO_DEVICE
+ DMA_FROM_DEVICE
+ DMA_NONE
+
+One should provide the exact DMA direction if you know it.
+
+DMA_TO_DEVICE means "from main memory to the device"
+DMA_FROM_DEVICE means "from the device to main memory"
+It is the direction in which the data moves during the DMA
+transfer.
+
+You are _strongly_ encouraged to specify this as precisely
+as you possibly can.
+
+If you absolutely cannot know the direction of the DMA transfer,
+specify DMA_BIDIRECTIONAL.  It means that the DMA can go in
+either direction.  The platform guarantees that you may legally
+specify this, and that it will work, but this may be at the
+cost of performance for example.
+
+The value DMA_NONE is to be used for debugging.  One can
+hold this in a data structure before you come to know the
+precise direction, and this will help catch cases where your
+direction tracking logic has failed to set things up properly.
+
+Another advantage of specifying this value precisely (outside of
+potential platform-specific optimizations of such) is for debugging.
+Some platforms actually have a write permission boolean which DMA
+mappings can be marked with, much like page protections in the user
+program address space.  Such platforms can and do report errors in the
+kernel logs when the DMA controller hardware detects violation of the
+permission setting.
+
+Only streaming mappings specify a direction, consistent mappings
+implicitly have a direction attribute setting of
+DMA_BIDIRECTIONAL.
+
+The SCSI subsystem tells you the direction to use in the
+'sc_data_direction' member of the SCSI command your driver is
+working on.
+
+For Networking drivers, it's a rather simple affair.  For transmit
+packets, map/unmap them with the DMA_TO_DEVICE direction
+specifier.  For receive packets, just the opposite, map/unmap them
+with the DMA_FROM_DEVICE direction specifier.
+
+		  Using Streaming DMA mappings
+
+The streaming DMA mapping routines can be called from interrupt
+context.  There are two versions of each map/unmap, one which will
+map/unmap a single memory region, and one which will map/unmap a
+scatterlist.
+
+To map a single region, you do:
+
+	struct device *dev = &my_dev->dev;
+	dma_addr_t dma_handle;
+	void *addr = buffer->ptr;
+	size_t size = buffer->len;
+
+	dma_handle = dma_map_single(dev, addr, size, direction);
+
+and to unmap it:
+
+	dma_unmap_single(dev, dma_handle, size, direction);
+
+You should call dma_unmap_single when the DMA activity is finished, e.g.
+from the interrupt which told you that the DMA transfer is done.
+
+Using cpu pointers like this for single mappings has a disadvantage,
+you cannot reference HIGHMEM memory in this way.  Thus, there is a
+map/unmap interface pair akin to dma_{map,unmap}_single.  These
+interfaces deal with page/offset pairs instead of cpu pointers.
+Specifically:
+
+	struct device *dev = &my_dev->dev;
+	dma_addr_t dma_handle;
+	struct page *page = buffer->page;
+	unsigned long offset = buffer->offset;
+	size_t size = buffer->len;
+
+	dma_handle = dma_map_page(dev, page, offset, size, direction);
+
+	...
+
+	dma_unmap_page(dev, dma_handle, size, direction);
+
+Here, "offset" means byte offset within the given page.
+
+With scatterlists, you map a region gathered from several regions by:
+
+	int i, count = dma_map_sg(dev, sglist, nents, direction);
+	struct scatterlist *sg;
+
+	for_each_sg(sglist, sg, count, i) {
+		hw_address[i] = sg_dma_address(sg);
+		hw_len[i] = sg_dma_len(sg);
+	}
+
+where nents is the number of entries in the sglist.
+
+The implementation is free to merge several consecutive sglist entries
+into one (e.g. if DMA mapping is done with PAGE_SIZE granularity, any
+consecutive sglist entries can be merged into one provided the first one
+ends and the second one starts on a page boundary - in fact this is a huge
+advantage for cards which either cannot do scatter-gather or have very
+limited number of scatter-gather entries) and returns the actual number
+of sg entries it mapped them to. On failure 0 is returned.
+
+Then you should loop count times (note: this can be less than nents times)
+and use sg_dma_address() and sg_dma_len() macros where you previously
+accessed sg->address and sg->length as shown above.
+
+To unmap a scatterlist, just call:
+
+	dma_unmap_sg(dev, sglist, nents, direction);
+
+Again, make sure DMA activity has already finished.
+
+PLEASE NOTE:  The 'nents' argument to the dma_unmap_sg call must be
+              the _same_ one you passed into the dma_map_sg call,
+	      it should _NOT_ be the 'count' value _returned_ from the
+              dma_map_sg call.
+
+Every dma_map_{single,sg} call should have its dma_unmap_{single,sg}
+counterpart, because the bus address space is a shared resource (although
+in some ports the mapping is per each BUS so less devices contend for the
+same bus address space) and you could render the machine unusable by eating
+all bus addresses.
+
+If you need to use the same streaming DMA region multiple times and touch
+the data in between the DMA transfers, the buffer needs to be synced
+properly in order for the cpu and device to see the most uptodate and
+correct copy of the DMA buffer.
+
+So, firstly, just map it with dma_map_{single,sg}, and after each DMA
+transfer call either:
+
+	dma_sync_single_for_cpu(dev, dma_handle, size, direction);
+
+or:
+
+	dma_sync_sg_for_cpu(dev, sglist, nents, direction);
+
+as appropriate.
+
+Then, if you wish to let the device get at the DMA area again,
+finish accessing the data with the cpu, and then before actually
+giving the buffer to the hardware call either:
+
+	dma_sync_single_for_device(dev, dma_handle, size, direction);
+
+or:
+
+	dma_sync_sg_for_device(dev, sglist, nents, direction);
+
+as appropriate.
+
+After the last DMA transfer call one of the DMA unmap routines
+dma_unmap_{single,sg}. If you don't touch the data from the first dma_map_*
+call till dma_unmap_*, then you don't have to call the dma_sync_*
+routines at all.
+
+Here is pseudo code which shows a situation in which you would need
+to use the dma_sync_*() interfaces.
+
+	my_card_setup_receive_buffer(struct my_card *cp, char *buffer, int len)
+	{
+		dma_addr_t mapping;
+
+		mapping = dma_map_single(cp->dev, buffer, len, DMA_FROM_DEVICE);
+
+		cp->rx_buf = buffer;
+		cp->rx_len = len;
+		cp->rx_dma = mapping;
+
+		give_rx_buf_to_card(cp);
+	}
+
+	...
+
+	my_card_interrupt_handler(int irq, void *devid, struct pt_regs *regs)
+	{
+		struct my_card *cp = devid;
+
+		...
+		if (read_card_status(cp) == RX_BUF_TRANSFERRED) {
+			struct my_card_header *hp;
+
+			/* Examine the header to see if we wish
+			 * to accept the data.  But synchronize
+			 * the DMA transfer with the CPU first
+			 * so that we see updated contents.
+			 */
+			dma_sync_single_for_cpu(&cp->dev, cp->rx_dma,
+						cp->rx_len,
+						DMA_FROM_DEVICE);
+
+			/* Now it is safe to examine the buffer. */
+			hp = (struct my_card_header *) cp->rx_buf;
+			if (header_is_ok(hp)) {
+				dma_unmap_single(&cp->dev, cp->rx_dma, cp->rx_len,
+						 DMA_FROM_DEVICE);
+				pass_to_upper_layers(cp->rx_buf);
+				make_and_setup_new_rx_buf(cp);
+			} else {
+				/* Just sync the buffer and give it back
+				 * to the card.
+				 */
+				dma_sync_single_for_device(&cp->dev,
+							   cp->rx_dma,
+							   cp->rx_len,
+							   DMA_FROM_DEVICE);
+				give_rx_buf_to_card(cp);
+			}
+		}
+	}
+
+Drivers converted fully to this interface should not use virt_to_bus any
+longer, nor should they use bus_to_virt. Some drivers have to be changed a
+little bit, because there is no longer an equivalent to bus_to_virt in the
+dynamic DMA mapping scheme - you have to always store the DMA addresses
+returned by the dma_alloc_coherent, dma_pool_alloc, and dma_map_single
+calls (dma_map_sg stores them in the scatterlist itself if the platform
+supports dynamic DMA mapping in hardware) in your driver structures and/or
+in the card registers.
+
+All drivers should be using these interfaces with no exceptions.  It
+is planned to completely remove virt_to_bus() and bus_to_virt() as
+they are entirely deprecated.  Some ports already do not provide these
+as it is impossible to correctly support them.
+
+			Handling Errors
+
+DMA address space is limited on some architectures and an allocation
+failure can be determined by:
+
+- checking if dma_alloc_coherent returns NULL or dma_map_sg returns 0
+
+- checking the returned dma_addr_t of dma_map_single and dma_map_page
+  by using dma_mapping_error():
+
+	dma_addr_t dma_handle;
+
+	dma_handle = dma_map_single(dev, addr, size, direction);
+	if (dma_mapping_error(dev, dma_handle)) {
+		/*
+		 * reduce current DMA mapping usage,
+		 * delay and try again later or
+		 * reset driver.
+		 */
+	}
+
+Networking drivers must call dev_kfree_skb to free the socket buffer
+and return NETDEV_TX_OK if the DMA mapping fails on the transmit hook
+(ndo_start_xmit). This means that the socket buffer is just dropped in
+the failure case.
+
+SCSI drivers must return SCSI_MLQUEUE_HOST_BUSY if the DMA mapping
+fails in the queuecommand hook. This means that the SCSI subsystem
+passes the command to the driver again later.
+
+		Optimizing Unmap State Space Consumption
+
+On many platforms, dma_unmap_{single,page}() is simply a nop.
+Therefore, keeping track of the mapping address and length is a waste
+of space.  Instead of filling your drivers up with ifdefs and the like
+to "work around" this (which would defeat the whole purpose of a
+portable API) the following facilities are provided.
+
+Actually, instead of describing the macros one by one, we'll
+transform some example code.
+
+1) Use DEFINE_DMA_UNMAP_{ADDR,LEN} in state saving structures.
+   Example, before:
+
+	struct ring_state {
+		struct sk_buff *skb;
+		dma_addr_t mapping;
+		__u32 len;
+	};
+
+   after:
+
+	struct ring_state {
+		struct sk_buff *skb;
+		DEFINE_DMA_UNMAP_ADDR(mapping);
+		DEFINE_DMA_UNMAP_LEN(len);
+	};
+
+2) Use dma_unmap_{addr,len}_set to set these values.
+   Example, before:
+
+	ringp->mapping = FOO;
+	ringp->len = BAR;
+
+   after:
+
+	dma_unmap_addr_set(ringp, mapping, FOO);
+	dma_unmap_len_set(ringp, len, BAR);
+
+3) Use dma_unmap_{addr,len} to access these values.
+   Example, before:
+
+	dma_unmap_single(dev, ringp->mapping, ringp->len,
+			 DMA_FROM_DEVICE);
+
+   after:
+
+	dma_unmap_single(dev,
+			 dma_unmap_addr(ringp, mapping),
+			 dma_unmap_len(ringp, len),
+			 DMA_FROM_DEVICE);
+
+It really should be self-explanatory.  We treat the ADDR and LEN
+separately, because it is possible for an implementation to only
+need the address in order to perform the unmap operation.
+
+			Platform Issues
+
+If you are just writing drivers for Linux and do not maintain
+an architecture port for the kernel, you can safely skip down
+to "Closing".
+
+1) Struct scatterlist requirements.
+
+   Don't invent the architecture specific struct scatterlist; just use
+   <asm-generic/scatterlist.h>. You need to enable
+   CONFIG_NEED_SG_DMA_LENGTH if the architecture supports IOMMUs
+   (including software IOMMU).
+
+2) ARCH_DMA_MINALIGN
+
+   Architectures must ensure that kmalloc'ed buffer is
+   DMA-safe. Drivers and subsystems depend on it. If an architecture
+   isn't fully DMA-coherent (i.e. hardware doesn't ensure that data in
+   the CPU cache is identical to data in main memory),
+   ARCH_DMA_MINALIGN must be set so that the memory allocator
+   makes sure that kmalloc'ed buffer doesn't share a cache line with
+   the others. See arch/arm/include/asm/cache.h as an example.
+
+   Note that ARCH_DMA_MINALIGN is about DMA memory alignment
+   constraints. You don't need to worry about the architecture data
+   alignment constraints (e.g. the alignment constraints about 64-bit
+   objects).
+
+3) Supporting multiple types of IOMMUs
+
+   If your architecture needs to support multiple types of IOMMUs, you
+   can use include/linux/asm-generic/dma-mapping-common.h. It's a
+   library to support the DMA API with multiple types of IOMMUs. Lots
+   of architectures (x86, powerpc, sh, alpha, ia64, microblaze and
+   sparc) use it. Choose one to see how it can be used. If you need to
+   support multiple types of IOMMUs in a single system, the example of
+   x86 or powerpc helps.
+
+			   Closing
+
+This document, and the API itself, would not be in its current
+form without the feedback and suggestions from numerous individuals.
+We would like to specifically mention, in no particular order, the
+following people:
+
+	Russell King <rmk@arm.linux.org.uk>
+	Leo Dagum <dagum@barrel.engr.sgi.com>
+	Ralf Baechle <ralf@oss.sgi.com>
+	Grant Grundler <grundler@cup.hp.com>
+	Jay Estabrook <Jay.Estabrook@compaq.com>
+	Thomas Sailer <sailer@ife.ee.ethz.ch>
+	Andrea Arcangeli <andrea@suse.de>
+	Jens Axboe <jens.axboe@oracle.com>
+	David Mosberger-Tang <davidm@hpl.hp.com>

Documentation/DMA-API.txt

@@ -4,20 +4,18 @@
         James E.J. Bottomley <James.Bottomley@HansenPartnership.com>
 
 This document describes the DMA API.  For a more gentle introduction
-phrased in terms of the pci_ equivalents (and actual examples) see
-Documentation/PCI/PCI-DMA-mapping.txt.
+of the API (and actual examples) see
+Documentation/DMA-API-HOWTO.txt.
 
-This API is split into two pieces.  Part I describes the API and the
-corresponding pci_ API.  Part II describes the extensions to the API
-for supporting non-consistent memory machines.  Unless you know that
-your driver absolutely has to support non-consistent platforms (this
-is usually only legacy platforms) you should only use the API
-described in part I.
+This API is split into two pieces.  Part I describes the API.  Part II
+describes the extensions to the API for supporting non-consistent
+memory machines.  Unless you know that your driver absolutely has to
+support non-consistent platforms (this is usually only legacy
+platforms) you should only use the API described in part I.
 
-Part I - pci_ and dma_ Equivalent API 
+Part I - dma_ API
 -------------------------------------
 
-To get the pci_ API, you must #include <linux/pci.h>
 To get the dma_ API, you must #include <linux/dma-mapping.h>
 
 
@@ -27,9 +25,6 @@ Part Ia - Using large dma-coherent buffers
 void *
 dma_alloc_coherent(struct device *dev, size_t size,
 			     dma_addr_t *dma_handle, gfp_t flag)
-void *
-pci_alloc_consistent(struct pci_dev *dev, size_t size,
-			     dma_addr_t *dma_handle)
 
 Consistent memory is memory for which a write by either the device or
 the processor can immediately be read by the processor or device
@@ -53,15 +48,11 @@ The simplest way to do that is to use the dma_pool calls (see below).
 The flag parameter (dma_alloc_coherent only) allows the caller to
 specify the GFP_ flags (see kmalloc) for the allocation (the
 implementation may choose to ignore flags that affect the location of
-the returned memory, like GFP_DMA).  For pci_alloc_consistent, you
-must assume GFP_ATOMIC behaviour.
+the returned memory, like GFP_DMA).
 
 void
 dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
 			   dma_addr_t dma_handle)
-void
-pci_free_consistent(struct pci_dev *dev, size_t size, void *cpu_addr,
-			   dma_addr_t dma_handle)
 
 Free the region of consistent memory you previously allocated.  dev,
 size and dma_handle must all be the same as those passed into the
@@ -89,10 +80,6 @@ for alignment, like queue heads needing to be aligned on N-byte boundaries.
 	dma_pool_create(const char *name, struct device *dev,
 			size_t size, size_t align, size_t alloc);
 
-	struct pci_pool *
-	pci_pool_create(const char *name, struct pci_device *dev,
-			size_t size, size_t align, size_t alloc);
-
 The pool create() routines initialize a pool of dma-coherent buffers
 for use with a given device.  It must be called in a context which
 can sleep.
@@ -108,9 +95,6 @@ from this pool must not cross 4KByte boundaries.
 	void *dma_pool_alloc(struct dma_pool *pool, gfp_t gfp_flags,
 			dma_addr_t *dma_handle);
 
-	void *pci_pool_alloc(struct pci_pool *pool, gfp_t gfp_flags,
-			dma_addr_t *dma_handle);
-
 This allocates memory from the pool; the returned memory will meet the size
 and alignment requirements specified at creation time.  Pass GFP_ATOMIC to
 prevent blocking, or if it's permitted (not in_interrupt, not holding SMP locks),
@@ -122,9 +106,6 @@ pool's device.
 	void dma_pool_free(struct dma_pool *pool, void *vaddr,
 			dma_addr_t addr);
 
-	void pci_pool_free(struct pci_pool *pool, void *vaddr,
-			dma_addr_t addr);
-
 This puts memory back into the pool.  The pool is what was passed to
 the pool allocation routine; the cpu (vaddr) and dma addresses are what
 were returned when that routine allocated the memory being freed.
@@ -132,8 +113,6 @@ were returned when that routine allocated the memory being freed.
 
 	void dma_pool_destroy(struct dma_pool *pool);
 
-	void pci_pool_destroy(struct pci_pool *pool);
-
 The pool destroy() routines free the resources of the pool.  They must be
 called in a context which can sleep.  Make sure you've freed all allocated
 memory back to the pool before you destroy it.
@@ -144,8 +123,6 @@ Part Ic - DMA addressing limitations
 
 int
 dma_supported(struct device *dev, u64 mask)
-int
-pci_dma_supported(struct pci_dev *hwdev, u64 mask)
 
 Checks to see if the device can support DMA to the memory described by
 mask.
@@ -159,8 +136,14 @@ driver writers.
 
 int
 dma_set_mask(struct device *dev, u64 mask)
+
+Checks to see if the mask is possible and updates the device
+parameters if it is.
+
+Returns: 0 if successful and a negative error if not.
+
 int
-pci_set_dma_mask(struct pci_device *dev, u64 mask)
+dma_set_coherent_mask(struct device *dev, u64 mask)
 
 Checks to see if the mask is possible and updates the device
 parameters if it is.
@@ -187,9 +170,6 @@ Part Id - Streaming DMA mappings
 dma_addr_t
 dma_map_single(struct device *dev, void *cpu_addr, size_t size,
 		      enum dma_data_direction direction)
-dma_addr_t
-pci_map_single(struct pci_dev *hwdev, void *cpu_addr, size_t size,
-		      int direction)
 
 Maps a piece of processor virtual memory so it can be accessed by the
 device and returns the physical handle of the memory.
@@ -198,14 +178,10 @@ The direction for both api's may be converted freely by casting.
 However the dma_ API uses a strongly typed enumerator for its
 direction:
 
-DMA_NONE		= PCI_DMA_NONE		no direction (used for
-						debugging)
-DMA_TO_DEVICE		= PCI_DMA_TODEVICE	data is going from the
-						memory to the device
-DMA_FROM_DEVICE		= PCI_DMA_FROMDEVICE	data is coming from
-						the device to the
-						memory
-DMA_BIDIRECTIONAL	= PCI_DMA_BIDIRECTIONAL	direction isn't known
+DMA_NONE		no direction (used for debugging)
+DMA_TO_DEVICE		data is going from the memory to the device
+DMA_FROM_DEVICE		data is coming from the device to the memory
+DMA_BIDIRECTIONAL	direction isn't known
 
 Notes:  Not all memory regions in a machine can be mapped by this
 API.  Further, regions that appear to be physically contiguous in
@@ -268,9 +244,6 @@ cache lines are updated with data that the device may have changed).
 void
 dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
 		 enum dma_data_direction direction)
-void
-pci_unmap_single(struct pci_dev *hwdev, dma_addr_t dma_addr,
-		 size_t size, int direction)
 
 Unmaps the region previously mapped.  All the parameters passed in
 must be identical to those passed in (and returned) by the mapping
@@ -280,15 +253,9 @@ dma_addr_t
 dma_map_page(struct device *dev, struct page *page,
 		    unsigned long offset, size_t size,
 		    enum dma_data_direction direction)
-dma_addr_t
-pci_map_page(struct pci_dev *hwdev, struct page *page,
-		    unsigned long offset, size_t size, int direction)
 void
 dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
 	       enum dma_data_direction direction)
-void
-pci_unmap_page(struct pci_dev *hwdev, dma_addr_t dma_address,
-	       size_t size, int direction)
 
 API for mapping and unmapping for pages.  All the notes and warnings
 for the other mapping APIs apply here.  Also, although the <offset>
@@ -299,9 +266,6 @@ cache width is.
 int
 dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 
-int
-pci_dma_mapping_error(struct pci_dev *hwdev, dma_addr_t dma_addr)
-
 In some circumstances dma_map_single and dma_map_page will fail to create
 a mapping. A driver can check for these errors by testing the returned
 dma address with dma_mapping_error(). A non-zero return value means the mapping
@@ -311,9 +275,6 @@ reduce current DMA mapping usage or delay and try again later).
 	int
 	dma_map_sg(struct device *dev, struct scatterlist *sg,
 		int nents, enum dma_data_direction direction)
-	int
-	pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sg,
-		int nents, int direction)
 
 Returns: the number of physical segments mapped (this may be shorter
 than <nents> passed in if some elements of the scatter/gather list are
@@ -353,9 +314,6 @@ accessed sg->address and sg->length as shown above.
 	void
 	dma_unmap_sg(struct device *dev, struct scatterlist *sg,
 		int nhwentries, enum dma_data_direction direction)
-	void
-	pci_unmap_sg(struct pci_dev *hwdev, struct scatterlist *sg,
-		int nents, int direction)
 
 Unmap the previously mapped scatter/gather list.  All the parameters
 must be the same as those and passed in to the scatter/gather mapping
@@ -365,21 +323,23 @@ Note: <nents> must be the number you passed in, *not* the number of
 physical entries returned.
 
 void
-dma_sync_single(struct device *dev, dma_addr_t dma_handle, size_t size,
-		enum dma_data_direction direction)
+dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
+			enum dma_data_direction direction)
 void
-pci_dma_sync_single(struct pci_dev *hwdev, dma_addr_t dma_handle,
-			   size_t size, int direction)
+dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
+			   enum dma_data_direction direction)
 void
-dma_sync_sg(struct device *dev, struct scatterlist *sg, int nelems,
-			  enum dma_data_direction direction)
+dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
+		    enum dma_data_direction direction)
 void
-pci_dma_sync_sg(struct pci_dev *hwdev, struct scatterlist *sg,
-		       int nelems, int direction)
+dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
+		       enum dma_data_direction direction)
 
-Synchronise a single contiguous or scatter/gather mapping.  All the
-parameters must be the same as those passed into the single mapping
-API.
+Synchronise a single contiguous or scatter/gather mapping for the cpu
+and device. With the sync_sg API, all the parameters must be the same
+as those passed into the single mapping API. With the sync_single API,
+you can use dma_handle and size parameters that aren't identical to
+those passed into the single mapping API to do a partial sync.
 
 Notes:  You must do this:
 
@@ -461,9 +421,9 @@ void whizco_dma_map_sg_attrs(struct device *dev, dma_addr_t dma_addr,
 Part II - Advanced dma_ usage
 -----------------------------
 
-Warning: These pieces of the DMA API have no PCI equivalent.  They
-should also not be used in the majority of cases, since they cater for
-unlikely corner cases that don't belong in usual drivers.
+Warning: These pieces of the DMA API should not be used in the
+majority of cases, since they cater for unlikely corner cases that
+don't belong in usual drivers.
 
 If you don't understand how cache line coherency works between a
 processor and an I/O device, you should not be using this part of the
@@ -495,12 +455,6 @@ Free memory allocated by the nonconsistent API.  All parameters must
 be identical to those passed in (and returned by
 dma_alloc_noncoherent()).
 
-int
-dma_is_consistent(struct device *dev, dma_addr_t dma_handle)
-
-Returns true if the device dev is performing consistent DMA on the memory
-area pointed to by the dma_handle.
-
 int
 dma_get_cache_alignment(void)
 
@@ -513,16 +467,6 @@ line, but it will guarantee that one or more cache lines fit exactly
 into the width returned by this call.  It will also always be a power
 of two for easy alignment.
 
-void
-dma_sync_single_range(struct device *dev, dma_addr_t dma_handle,
-		      unsigned long offset, size_t size,
-		      enum dma_data_direction direction)
-
-Does a partial sync, starting at offset and continuing for size.  You
-must be careful to observe the cache alignment and width when doing
-anything like this.  You must also be extra careful about accessing
-memory you intend to sync partially.
-
 void
 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 	       enum dma_data_direction direction)

Documentation/DocBook/Makefile

@@ -14,7 +14,7 @@ DOCBOOKS := z8530book.xml mcabook.xml device-drivers.xml \
 	    genericirq.xml s390-drivers.xml uio-howto.xml scsi.xml \
 	    mac80211.xml debugobjects.xml sh.xml regulator.xml \
 	    alsa-driver-api.xml writing-an-alsa-driver.xml \
-	    tracepoint.xml media.xml
+	    tracepoint.xml media.xml drm.xml
 
 ###
 # The build process is as follows (targets):
@@ -35,7 +35,7 @@ PS_METHOD	= $(prefer-db2x)
 PHONY += xmldocs sgmldocs psdocs pdfdocs htmldocs mandocs installmandocs cleandocs xmldoclinks
 
 BOOKS := $(addprefix $(obj)/,$(DOCBOOKS))
-xmldocs: $(BOOKS) xmldoclinks
+xmldocs: $(BOOKS)
 sgmldocs: xmldocs
 
 PS := $(patsubst %.xml, %.ps, $(BOOKS))
@@ -45,7 +45,7 @@ PDF := $(patsubst %.xml, %.pdf, $(BOOKS))
 pdfdocs: $(PDF)
 
 HTML := $(sort $(patsubst %.xml, %.html, $(BOOKS)))
-htmldocs: $(HTML)
+htmldocs: $(HTML) xmldoclinks
 	$(call build_main_index)
 	$(call build_images)
 
@@ -95,7 +95,7 @@ define rule_docproc
         ) > $(dir $@).$(notdir $@).cmd
 endef
 
-%.xml: %.tmpl FORCE
+%.xml: %.tmpl xmldoclinks FORCE
 	$(call if_changed_rule,docproc)
 
 ###

Documentation/DocBook/device-drivers.tmpl

@@ -45,8 +45,7 @@
      </sect1>
 
      <sect1><title>Atomic and pointer manipulation</title>
-!Iarch/x86/include/asm/atomic_32.h
-!Iarch/x86/include/asm/unaligned.h
+!Iarch/x86/include/asm/atomic.h
      </sect1>
 
      <sect1><title>Delaying, scheduling, and timer routines</title>
@@ -111,6 +110,7 @@ X!Edrivers/base/attribute_container.c
 <!--
 X!Edrivers/base/interface.c
 -->
+!Iinclude/linux/platform_device.h
 !Edrivers/base/platform.c
 !Edrivers/base/bus.c
      </sect1>

Documentation/DocBook/deviceiobook.tmpl

@@ -316,7 +316,7 @@ CPU B:  spin_unlock_irqrestore(&dev_lock, flags)
 
   <chapter id="pubfunctions">
      <title>Public Functions Provided</title>
-!Iarch/x86/include/asm/io_32.h
+!Iarch/x86/include/asm/io.h
 !Elib/iomap.c
   </chapter>
 

Documentation/DocBook/drm.tmpl

@@ -0,0 +1,839 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
+	"http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" []>
+
+<book id="drmDevelopersGuide">
+  <bookinfo>
+    <title>Linux DRM Developer's Guide</title>
+
+    <copyright>
+      <year>2008-2009</year>
+      <holder>
+	Intel Corporation (Jesse Barnes &lt;jesse.barnes@intel.com&gt;)
+      </holder>
+    </copyright>
+
+    <legalnotice>
+      <para>
+	The contents of this file may be used under the terms of the GNU
+	General Public License version 2 (the "GPL") as distributed in
+	the kernel source COPYING file.
+      </para>
+    </legalnotice>
+  </bookinfo>
+
+<toc></toc>
+
+  <!-- Introduction -->
+
+  <chapter id="drmIntroduction">
+    <title>Introduction</title>
+    <para>
+      The Linux DRM layer contains code intended to support the needs
+      of complex graphics devices, usually containing programmable
+      pipelines well suited to 3D graphics acceleration.  Graphics
+      drivers in the kernel can make use of DRM functions to make
+      tasks like memory management, interrupt handling and DMA easier,
+      and provide a uniform interface to applications.
+    </para>
+    <para>
+      A note on versions: this guide covers features found in the DRM
+      tree, including the TTM memory manager, output configuration and
+      mode setting, and the new vblank internals, in addition to all
+      the regular features found in current kernels.
+    </para>
+    <para>
+      [Insert diagram of typical DRM stack here]
+    </para>
+  </chapter>
+
+  <!-- Internals -->
+
+  <chapter id="drmInternals">
+    <title>DRM Internals</title>
+    <para>
+      This chapter documents DRM internals relevant to driver authors
+      and developers working to add support for the latest features to
+      existing drivers.
+    </para>
+    <para>
+      First, we'll go over some typical driver initialization
+      requirements, like setting up command buffers, creating an
+      initial output configuration, and initializing core services.
+      Subsequent sections will cover core internals in more detail,
+      providing implementation notes and examples.
+    </para>
+    <para>
+      The DRM layer provides several services to graphics drivers,
+      many of them driven by the application interfaces it provides
+      through libdrm, the library that wraps most of the DRM ioctls.
+      These include vblank event handling, memory
+      management, output management, framebuffer management, command
+      submission &amp; fencing, suspend/resume support, and DMA
+      services.
+    </para>
+    <para>
+      The core of every DRM driver is struct drm_device.  Drivers
+      will typically statically initialize a drm_device structure,
+      then pass it to drm_init() at load time.
+    </para>
+
+  <!-- Internals: driver init -->
+
+  <sect1>
+    <title>Driver initialization</title>
+    <para>
+      Before calling the DRM initialization routines, the driver must
+      first create and fill out a struct drm_device structure.
+    </para>
+    <programlisting>
+      static struct drm_driver driver = {
+	/* don't use mtrr's here, the Xserver or user space app should
+	 * deal with them for intel hardware.
+	 */
+	.driver_features =
+	    DRIVER_USE_AGP | DRIVER_REQUIRE_AGP |
+	    DRIVER_HAVE_IRQ | DRIVER_IRQ_SHARED | DRIVER_MODESET,
+	.load = i915_driver_load,
+	.unload = i915_driver_unload,
+	.firstopen = i915_driver_firstopen,
+	.lastclose = i915_driver_lastclose,
+	.preclose = i915_driver_preclose,
+	.save = i915_save,
+	.restore = i915_restore,
+	.device_is_agp = i915_driver_device_is_agp,
+	.get_vblank_counter = i915_get_vblank_counter,
+	.enable_vblank = i915_enable_vblank,
+	.disable_vblank = i915_disable_vblank,
+	.irq_preinstall = i915_driver_irq_preinstall,
+	.irq_postinstall = i915_driver_irq_postinstall,
+	.irq_uninstall = i915_driver_irq_uninstall,
+	.irq_handler = i915_driver_irq_handler,
+	.reclaim_buffers = drm_core_reclaim_buffers,
+	.get_map_ofs = drm_core_get_map_ofs,
+	.get_reg_ofs = drm_core_get_reg_ofs,
+	.fb_probe = intelfb_probe,
+	.fb_remove = intelfb_remove,
+	.fb_resize = intelfb_resize,
+	.master_create = i915_master_create,
+	.master_destroy = i915_master_destroy,
+#if defined(CONFIG_DEBUG_FS)
+	.debugfs_init = i915_debugfs_init,
+	.debugfs_cleanup = i915_debugfs_cleanup,
+#endif
+	.gem_init_object = i915_gem_init_object,
+	.gem_free_object = i915_gem_free_object,
+	.gem_vm_ops = &amp;i915_gem_vm_ops,
+	.ioctls = i915_ioctls,
+	.fops = {
+		.owner = THIS_MODULE,
+		.open = drm_open,
+		.release = drm_release,
+		.ioctl = drm_ioctl,
+		.mmap = drm_mmap,
+		.poll = drm_poll,
+		.fasync = drm_fasync,
+#ifdef CONFIG_COMPAT
+		.compat_ioctl = i915_compat_ioctl,
+#endif
+		},
+	.pci_driver = {
+		.name = DRIVER_NAME,
+		.id_table = pciidlist,
+		.probe = probe,
+		.remove = __devexit_p(drm_cleanup_pci),
+		},
+	.name = DRIVER_NAME,
+	.desc = DRIVER_DESC,
+	.date = DRIVER_DATE,
+	.major = DRIVER_MAJOR,
+	.minor = DRIVER_MINOR,
+	.patchlevel = DRIVER_PATCHLEVEL,
+      };
+    </programlisting>
+    <para>
+      In the example above, taken from the i915 DRM driver, the driver
+      sets several flags indicating what core features it supports.
+      We'll go over the individual callbacks in later sections.  Since
+      flags indicate which features your driver supports to the DRM
+      core, you need to set most of them prior to calling drm_init().  Some,
+      like DRIVER_MODESET can be set later based on user supplied parameters,
+      but that's the exception rather than the rule.
+    </para>
+    <variablelist>
+      <title>Driver flags</title>
+      <varlistentry>
+	<term>DRIVER_USE_AGP</term>
+	<listitem><para>
+	    Driver uses AGP interface
+	</para></listitem>
+      </varlistentry>
+      <varlistentry>
+	<term>DRIVER_REQUIRE_AGP</term>
+	<listitem><para>
+	    Driver needs AGP interface to function.
+	</para></listitem>
+      </varlistentry>
+      <varlistentry>
+	<term>DRIVER_USE_MTRR</term>
+	<listitem>
+	  <para>
+	    Driver uses MTRR interface for mapping memory.  Deprecated.
+	  </para>
+	</listitem>
+      </varlistentry>
+      <varlistentry>
+	<term>DRIVER_PCI_DMA</term>
+	<listitem><para>
+	    Driver is capable of PCI DMA.  Deprecated.
+	</para></listitem>
+      </varlistentry>
+      <varlistentry>
+	<term>DRIVER_SG</term>
+	<listitem><para>
+	    Driver can perform scatter/gather DMA.  Deprecated.
+	</para></listitem>
+      </varlistentry>
+      <varlistentry>
+	<term>DRIVER_HAVE_DMA</term>
+	<listitem><para>Driver supports DMA.  Deprecated.</para></listitem>
+      </varlistentry>
+      <varlistentry>
+	<term>DRIVER_HAVE_IRQ</term><term>DRIVER_IRQ_SHARED</term>
+	<listitem>
+	  <para>
+	    DRIVER_HAVE_IRQ indicates whether the driver has a IRQ
+	    handler, DRIVER_IRQ_SHARED indicates whether the device &amp;
+	    handler support shared IRQs (note that this is required of
+	    PCI drivers).
+	  </para>
+	</listitem>
+      </varlistentry>
+      <varlistentry>
+	<term>DRIVER_DMA_QUEUE</term>
+	<listitem>
+	  <para>
+	    If the driver queues DMA requests and completes them
+	    asynchronously, this flag should be set.  Deprecated.
+	  </para>
+	</listitem>
+      </varlistentry>
+      <varlistentry>
+	<term>DRIVER_FB_DMA</term>
+	<listitem>
+	  <para>
+	    Driver supports DMA to/from the framebuffer.  Deprecated.
+	  </para>
+	</listitem>
+      </varlistentry>
+      <varlistentry>
+	<term>DRIVER_MODESET</term>
+	<listitem>
+	  <para>
+	    Driver supports mode setting interfaces.
+	  </para>
+	</listitem>
+      </varlistentry>
+    </variablelist>
+    <para>
+      In this specific case, the driver requires AGP and supports
+      IRQs.  DMA, as we'll see, is handled by device specific ioctls
+      in this case.  It also supports the kernel mode setting APIs, though
+      unlike in the actual i915 driver source, this example unconditionally
+      exports KMS capability.
+    </para>
+  </sect1>
+
+  <!-- Internals: driver load -->
+
+  <sect1>
+    <title>Driver load</title>
+    <para>
+      In the previous section, we saw what a typical drm_driver
+      structure might look like.  One of the more important fields in
+      the structure is the hook for the load function.
+    </para>
+    <programlisting>
+      static struct drm_driver driver = {
+      	...
+      	.load = i915_driver_load,
+        ...
+      };
+    </programlisting>
+    <para>
+      The load function has many responsibilities: allocating a driver
+      private structure, specifying supported performance counters,
+      configuring the device (e.g. mapping registers &amp; command
+      buffers), initializing the memory manager, and setting up the
+      initial output configuration.
+    </para>
+    <para>
+      Note that the tasks performed at driver load time must not
+      conflict with DRM client requirements.  For instance, if user
+      level mode setting drivers are in use, it would be problematic
+      to perform output discovery &amp; configuration at load time.
+      Likewise, if pre-memory management aware user level drivers are
+      in use, memory management and command buffer setup may need to
+      be omitted.  These requirements are driver specific, and care
+      needs to be taken to keep both old and new applications and
+      libraries working.  The i915 driver supports the "modeset"
+      module parameter to control whether advanced features are
+      enabled at load time or in legacy fashion.  If compatibility is
+      a concern (e.g. with drivers converted over to the new interfaces
+      from the old ones), care must be taken to prevent incompatible
+      device initialization and control with the currently active
+      userspace drivers.
+    </para>
+
+    <sect2>
+      <title>Driver private &amp; performance counters</title>
+      <para>
+	The driver private hangs off the main drm_device structure and
+	can be used for tracking various device specific bits of
+	information, like register offsets, command buffer status,
+	register state for suspend/resume, etc.  At load time, a
+	driver can simply allocate one and set drm_device.dev_priv
+	appropriately; at unload the driver can free it and set
+	drm_device.dev_priv to NULL.
+      </para>
+      <para>
+	The DRM supports several counters which can be used for rough
+	performance characterization.  Note that the DRM stat counter
+	system is not often used by applications, and supporting
+	additional counters is completely optional.
+      </para>
+      <para>
+	These interfaces are deprecated and should not be used.  If performance
+	monitoring is desired, the developer should investigate and
+	potentially enhance the kernel perf and tracing infrastructure to export
+	GPU related performance information to performance monitoring
+	tools and applications.
+      </para>
+    </sect2>
+
+    <sect2>
+      <title>Configuring the device</title>
+      <para>
+	Obviously, device configuration will be device specific.
+	However, there are several common operations: finding a
+	device's PCI resources, mapping them, and potentially setting
+	up an IRQ handler.
+      </para>
+      <para>
+	Finding &amp; mapping resources is fairly straightforward.  The
+	DRM wrapper functions, drm_get_resource_start() and
+	drm_get_resource_len() can be used to find BARs on the given
+	drm_device struct.  Once those values have been retrieved, the
+	driver load function can call drm_addmap() to create a new
+	mapping for the BAR in question.  Note you'll probably want a
+	drm_local_map_t in your driver private structure to track any
+	mappings you create.
+<!-- !Fdrivers/gpu/drm/drm_bufs.c drm_get_resource_* -->
+<!-- !Finclude/drm/drmP.h drm_local_map_t -->
+      </para>
+      <para>
+	if compatibility with other operating systems isn't a concern
+	(DRM drivers can run under various BSD variants and OpenSolaris),
+	native Linux calls can be used for the above, e.g. pci_resource_*
+	and iomap*/iounmap.  See the Linux device driver book for more
+	info.
+      </para>
+      <para>
+	Once you have a register map, you can use the DRM_READn() and
+	DRM_WRITEn() macros to access the registers on your device, or
+	use driver specific versions to offset into your MMIO space
+	relative to a driver specific base pointer (see I915_READ for
+	example).
+      </para>
+      <para>
+	If your device supports interrupt generation, you may want to
+	setup an interrupt handler at driver load time as well.  This
+	is done using the drm_irq_install() function.  If your device
+	supports vertical blank interrupts, it should call
+	drm_vblank_init() to initialize the core vblank handling code before
+	enabling interrupts on your device.  This ensures the vblank related
+	structures are allocated and allows the core to handle vblank events.
+      </para>
+<!--!Fdrivers/char/drm/drm_irq.c drm_irq_install-->
+      <para>
+	Once your interrupt handler is registered (it'll use your
+	drm_driver.irq_handler as the actual interrupt handling
+	function), you can safely enable interrupts on your device,
+	assuming any other state your interrupt handler uses is also
+	initialized.
+      </para>
+      <para>
+	Another task that may be necessary during configuration is
+	mapping the video BIOS.  On many devices, the VBIOS describes
+	device configuration, LCD panel timings (if any), and contains
+	flags indicating device state.  Mapping the BIOS can be done
+	using the pci_map_rom() call, a convenience function that
+	takes care of mapping the actual ROM, whether it has been
+	shadowed into memory (typically at address 0xc0000) or exists
+	on the PCI device in the ROM BAR.  Note that once you've
+	mapped the ROM and extracted any necessary information, be
+	sure to unmap it; on many devices the ROM address decoder is
+	shared with other BARs, so leaving it mapped can cause
+	undesired behavior like hangs or memory corruption.
+<!--!Fdrivers/pci/rom.c pci_map_rom-->
+      </para>
+    </sect2>
+
+    <sect2>
+      <title>Memory manager initialization</title>
+      <para>
+	In order to allocate command buffers, cursor memory, scanout
+	buffers, etc., as well as support the latest features provided
+	by packages like Mesa and the X.Org X server, your driver
+	should support a memory manager.
+      </para>
+      <para>
+	If your driver supports memory management (it should!), you'll
+	need to set that up at load time as well.  How you initialize
+	it depends on which memory manager you're using, TTM or GEM.
+      </para>
+      <sect3>
+	<title>TTM initialization</title>
+	<para>
+	  TTM (for Translation Table Manager) manages video memory and
+	  aperture space for graphics devices. TTM supports both UMA devices
+	  and devices with dedicated video RAM (VRAM), i.e. most discrete
+	  graphics devices.  If your device has dedicated RAM, supporting
+	  TTM is desirable.  TTM also integrates tightly with your
+	  driver specific buffer execution function.  See the radeon
+	  driver for examples.
+	</para>
+	<para>
+	  The core TTM structure is the ttm_bo_driver struct.  It contains
+	  several fields with function pointers for initializing the TTM,
+	  allocating and freeing memory, waiting for command completion
+	  and fence synchronization, and memory migration.  See the
+	  radeon_ttm.c file for an example of usage.
+	</para>
+	<para>
+	  The ttm_global_reference structure is made up of several fields:
+	</para>
+	<programlisting>
+	  struct ttm_global_reference {
+	  	enum ttm_global_types global_type;
+	  	size_t size;
+	  	void *object;
+	  	int (*init) (struct ttm_global_reference *);
+	  	void (*release) (struct ttm_global_reference *);
+	  };
+	</programlisting>
+	<para>
+	  There should be one global reference structure for your memory
+	  manager as a whole, and there will be others for each object
+	  created by the memory manager at runtime.  Your global TTM should
+	  have a type of TTM_GLOBAL_TTM_MEM.  The size field for the global
+	  object should be sizeof(struct ttm_mem_global), and the init and
+	  release hooks should point at your driver specific init and
+	  release routines, which will probably eventually call
+	  ttm_mem_global_init and ttm_mem_global_release respectively.
+	</para>
+	<para>
+	  Once your global TTM accounting structure is set up and initialized
+	  (done by calling ttm_global_item_ref on the global object you
+	  just created), you'll need to create a buffer object TTM to
+	  provide a pool for buffer object allocation by clients and the
+	  kernel itself.  The type of this object should be TTM_GLOBAL_TTM_BO,
+	  and its size should be sizeof(struct ttm_bo_global).  Again,
+	  driver specific init and release functions can be provided,
+	  likely eventually calling ttm_bo_global_init and
+	  ttm_bo_global_release, respectively.  Also like the previous
+	  object, ttm_global_item_ref is used to create an initial reference
+	  count for the TTM, which will call your initialization function.
+	</para>
+      </sect3>
+      <sect3>
+	<title>GEM initialization</title>
+	<para>
+	  GEM is an alternative to TTM, designed specifically for UMA
+	  devices.  It has simpler initialization and execution requirements
+	  than TTM, but has no VRAM management capability.  Core GEM
+	  initialization is comprised of a basic drm_mm_init call to create
+	  a GTT DRM MM object, which provides an address space pool for
+	  object allocation.  In a KMS configuration, the driver will
+	  need to allocate and initialize a command ring buffer following
+	  basic GEM initialization.  Most UMA devices have a so-called
+	  "stolen" memory region, which provides space for the initial
+	  framebuffer and large, contiguous memory regions required by the
+	  device.  This space is not typically managed by GEM, and must
+	  be initialized separately into its own DRM MM object.
+	</para>
+	<para>
+	  Initialization will be driver specific, and will depend on
+	  the architecture of the device.  In the case of Intel
+	  integrated graphics chips like 965GM, GEM initialization can
+	  be done by calling the internal GEM init function,
+	  i915_gem_do_init().  Since the 965GM is a UMA device
+	  (i.e. it doesn't have dedicated VRAM), GEM will manage
+	  making regular RAM available for GPU operations.  Memory set
+	  aside by the BIOS (called "stolen" memory by the i915
+	  driver) will be managed by the DRM memrange allocator; the
+	  rest of the aperture will be managed by GEM.
+	  <programlisting>
+	    /* Basic memrange allocator for stolen space (aka vram) */
+	    drm_memrange_init(&amp;dev_priv->vram, 0, prealloc_size);
+	    /* Let GEM Manage from end of prealloc space to end of aperture */
+	    i915_gem_do_init(dev, prealloc_size, agp_size);
+	  </programlisting>
+<!--!Edrivers/char/drm/drm_memrange.c-->
+	</para>
+	<para>
+	  Once the memory manager has been set up, we can allocate the
+	  command buffer.  In the i915 case, this is also done with a
+	  GEM function, i915_gem_init_ringbuffer().
+	</para>
+      </sect3>
+    </sect2>
+
+    <sect2>
+      <title>Output configuration</title>
+      <para>
+	The final initialization task is output configuration.  This involves
+	finding and initializing the CRTCs, encoders and connectors
+	for your device, creating an initial configuration and
+	registering a framebuffer console driver.
+      </para>
+      <sect3>
+	<title>Output discovery and initialization</title>
+	<para>
+	  Several core functions exist to create CRTCs, encoders and
+	  connectors, namely drm_crtc_init(), drm_connector_init() and
+	  drm_encoder_init(), along with several "helper" functions to
+	  perform common tasks.
+	</para>
+	<para>
+	  Connectors should be registered with sysfs once they've been
+	  detected and initialized, using the
+	  drm_sysfs_connector_add() function.  Likewise, when they're
+	  removed from the system, they should be destroyed with
+	  drm_sysfs_connector_remove().
+	</para>
+	<programlisting>
+<![CDATA[
+void intel_crt_init(struct drm_device *dev)
+{
+	struct drm_connector *connector;
+	struct intel_output *intel_output;
+
+	intel_output = kzalloc(sizeof(struct intel_output), GFP_KERNEL);
+	if (!intel_output)
+		return;
+
+	connector = &intel_output->base;
+	drm_connector_init(dev, &intel_output->base,
+			   &intel_crt_connector_funcs, DRM_MODE_CONNECTOR_VGA);
+
+	drm_encoder_init(dev, &intel_output->enc, &intel_crt_enc_funcs,
+			 DRM_MODE_ENCODER_DAC);
+
+	drm_mode_connector_attach_encoder(&intel_output->base,
+					  &intel_output->enc);
+
+	/* Set up the DDC bus. */
+	intel_output->ddc_bus = intel_i2c_create(dev, GPIOA, "CRTDDC_A");
+	if (!intel_output->ddc_bus) {
+		dev_printk(KERN_ERR, &dev->pdev->dev, "DDC bus registration "
+			   "failed.\n");
+		return;
+	}
+
+	intel_output->type = INTEL_OUTPUT_ANALOG;
+	connector->interlace_allowed = 0;
+	connector->doublescan_allowed = 0;
+
+	drm_encoder_helper_add(&intel_output->enc, &intel_crt_helper_funcs);
+	drm_connector_helper_add(connector, &intel_crt_connector_helper_funcs);
+
+	drm_sysfs_connector_add(connector);
+}
+]]>
+	</programlisting>
+	<para>
+	  In the example above (again, taken from the i915 driver), a
+	  CRT connector and encoder combination is created.  A device
+	  specific i2c bus is also created, for fetching EDID data and
+	  performing monitor detection.  Once the process is complete,
+	  the new connector is registered with sysfs, to make its
+	  properties available to applications.
+	</para>
+	<sect4>
+	  <title>Helper functions and core functions</title>
+	  <para>
+	    Since many PC-class graphics devices have similar display output
+	    designs, the DRM provides a set of helper functions to make
+	    output management easier.  The core helper routines handle
+	    encoder re-routing and disabling of unused functions following
+	    mode set.  Using the helpers is optional, but recommended for
+	    devices with PC-style architectures (i.e. a set of display planes
+	    for feeding pixels to encoders which are in turn routed to
+	    connectors).  Devices with more complex requirements needing
+	    finer grained management can opt to use the core callbacks
+	    directly.
+	  </para>
+	  <para>
+	    [Insert typical diagram here.]  [Insert OMAP style config here.]
+	  </para>
+	</sect4>
+	<para>
+	  For each encoder, CRTC and connector, several functions must
+	  be provided, depending on the object type.  Encoder objects
+	  need to provide a DPMS (basically on/off) function, mode fixup
+	  (for converting requested modes into native hardware timings),
+	  and prepare, set and commit functions for use by the core DRM
+	  helper functions.  Connector helpers need to provide mode fetch and
+	  validity functions as well as an encoder matching function for
+	  returning an ideal encoder for a given connector.  The core
+	  connector functions include a DPMS callback, (deprecated)
+	  save/restore routines, detection, mode probing, property handling,
+	  and cleanup functions.
+	</para>
+<!--!Edrivers/char/drm/drm_crtc.h-->
+<!--!Edrivers/char/drm/drm_crtc.c-->
+<!--!Edrivers/char/drm/drm_crtc_helper.c-->
+      </sect3>
+    </sect2>
+  </sect1>
+
+  <!-- Internals: vblank handling -->
+
+  <sect1>
+    <title>VBlank event handling</title>
+    <para>
+      The DRM core exposes two vertical blank related ioctls:
+      DRM_IOCTL_WAIT_VBLANK and DRM_IOCTL_MODESET_CTL.
+<!--!Edrivers/char/drm/drm_irq.c-->
+    </para>
+    <para>
+      DRM_IOCTL_WAIT_VBLANK takes a struct drm_wait_vblank structure
+      as its argument, and is used to block or request a signal when a
+      specified vblank event occurs.
+    </para>
+    <para>
+      DRM_IOCTL_MODESET_CTL should be called by application level
+      drivers before and after mode setting, since on many devices the
+      vertical blank counter will be reset at that time.  Internally,
+      the DRM snapshots the last vblank count when the ioctl is called
+      with the _DRM_PRE_MODESET command so that the counter won't go
+      backwards (which is dealt with when _DRM_POST_MODESET is used).
+    </para>
+    <para>
+      To support the functions above, the DRM core provides several
+      helper functions for tracking vertical blank counters, and
+      requires drivers to provide several callbacks:
+      get_vblank_counter(), enable_vblank() and disable_vblank().  The
+      core uses get_vblank_counter() to keep the counter accurate
+      across interrupt disable periods.  It should return the current
+      vertical blank event count, which is often tracked in a device
+      register.  The enable and disable vblank callbacks should enable
+      and disable vertical blank interrupts, respectively.  In the
+      absence of DRM clients waiting on vblank events, the core DRM
+      code will use the disable_vblank() function to disable
+      interrupts, which saves power.  They'll be re-enabled again when
+      a client calls the vblank wait ioctl above.
+    </para>
+    <para>
+      Devices that don't provide a count register can simply use an
+      internal atomic counter incremented on every vertical blank
+      interrupt, and can make their enable and disable vblank
+      functions into no-ops.
+    </para>
+  </sect1>
+
+  <sect1>
+    <title>Memory management</title>
+    <para>
+      The memory manager lies at the heart of many DRM operations, and
+      is also required to support advanced client features like OpenGL
+      pbuffers.  The DRM currently contains two memory managers, TTM
+      and GEM.
+    </para>
+
+    <sect2>
+      <title>The Translation Table Manager (TTM)</title>
+      <para>
+	TTM was developed by Tungsten Graphics, primarily by Thomas
+	Hellström, and is intended to be a flexible, high performance
+	graphics memory manager.
+      </para>
+      <para>
+	Drivers wishing to support TTM must fill out a drm_bo_driver
+	structure.
+      </para>
+      <para>
+	TTM design background and information belongs here.
+      </para>
+    </sect2>
+
+    <sect2>
+      <title>The Graphics Execution Manager (GEM)</title>
+      <para>
+	GEM is an Intel project, authored by Eric Anholt and Keith
+	Packard.  It provides simpler interfaces than TTM, and is well
+	suited for UMA devices.
+      </para>
+      <para>
+	GEM-enabled drivers must provide gem_init_object() and
+	gem_free_object() callbacks to support the core memory
+	allocation routines.  They should also provide several driver
+	specific ioctls to support command execution, pinning, buffer
+	read &amp; write, mapping, and domain ownership transfers.
+      </para>
+      <para>
+	On a fundamental level, GEM involves several operations: memory
+	allocation and freeing, command execution, and aperture management
+	at command execution time.  Buffer object allocation is relatively
+	straightforward and largely provided by Linux's shmem layer, which
+	provides memory to back each object.  When mapped into the GTT
+	or used in a command buffer, the backing pages for an object are
+	flushed to memory and marked write combined so as to be coherent
+	with the GPU.  Likewise, when the GPU finishes rendering to an object,
+	if the CPU accesses it, it must be made coherent with the CPU's view
+	of memory, usually involving GPU cache flushing of various kinds.
+	This core CPU&lt;-&gt;GPU coherency management is provided by the GEM
+	set domain function, which evaluates an object's current domain and
+	performs any necessary flushing or synchronization to put the object
+	into the desired coherency domain (note that the object may be busy,
+	i.e. an active render target; in that case the set domain function
+	will block the client and wait for rendering to complete before
+	performing any necessary flushing operations).
+      </para>
+      <para>
+	Perhaps the most important GEM function is providing a command
+	execution interface to clients.  Client programs construct command
+	buffers containing references to previously allocated memory objects
+	and submit them to GEM.  At that point, GEM will take care to bind
+	all the objects into the GTT, execute the buffer, and provide
+	necessary synchronization between clients accessing the same buffers.
+	This often involves evicting some objects from the GTT and re-binding
+	others (a fairly expensive operation), and providing relocation
+	support which hides fixed GTT offsets from clients.  Clients must
+	take care not to submit command buffers that reference more objects
+	than can fit in the GTT or GEM will reject them and no rendering
+	will occur.  Similarly, if several objects in the buffer require
+	fence registers to be allocated for correct rendering (e.g. 2D blits
+	on pre-965 chips), care must be taken not to require more fence
+	registers than are available to the client.  Such resource management
+	should be abstracted from the client in libdrm.
+      </para>
+    </sect2>
+
+  </sect1>
+
+  <!-- Output management -->
+  <sect1>
+    <title>Output management</title>
+    <para>
+      At the core of the DRM output management code is a set of
+      structures representing CRTCs, encoders and connectors.
+    </para>
+    <para>
+      A CRTC is an abstraction representing a part of the chip that
+      contains a pointer to a scanout buffer.  Therefore, the number
+      of CRTCs available determines how many independent scanout
+      buffers can be active at any given time.  The CRTC structure
+      contains several fields to support this: a pointer to some video
+      memory, a display mode, and an (x, y) offset into the video
+      memory to support panning or configurations where one piece of
+      video memory spans multiple CRTCs.
+    </para>
+    <para>
+      An encoder takes pixel data from a CRTC and converts it to a
+      format suitable for any attached connectors.  On some devices,
+      it may be possible to have a CRTC send data to more than one
+      encoder.  In that case, both encoders would receive data from
+      the same scanout buffer, resulting in a "cloned" display
+      configuration across the connectors attached to each encoder.
+    </para>
+    <para>
+      A connector is the final destination for pixel data on a device,
+      and usually connects directly to an external display device like
+      a monitor or laptop panel.  A connector can only be attached to
+      one encoder at a time.  The connector is also the structure
+      where information about the attached display is kept, so it
+      contains fields for display data, EDID data, DPMS &amp;
+      connection status, and information about modes supported on the
+      attached displays.
+    </para>
+<!--!Edrivers/char/drm/drm_crtc.c-->
+  </sect1>
+
+  <sect1>
+    <title>Framebuffer management</title>
+    <para>
+      In order to set a mode on a given CRTC, encoder and connector
+      configuration, clients need to provide a framebuffer object which
+      will provide a source of pixels for the CRTC to deliver to the encoder(s)
+      and ultimately the connector(s) in the configuration.  A framebuffer
+      is fundamentally a driver specific memory object, made into an opaque
+      handle by the DRM addfb function.  Once an fb has been created this
+      way it can be passed to the KMS mode setting routines for use in
+      a configuration.
+    </para>
+  </sect1>
+
+  <sect1>
+    <title>Command submission &amp; fencing</title>
+    <para>
+      This should cover a few device specific command submission
+      implementations.
+    </para>
+  </sect1>
+
+  <sect1>
+    <title>Suspend/resume</title>
+    <para>
+      The DRM core provides some suspend/resume code, but drivers
+      wanting full suspend/resume support should provide save() and
+      restore() functions.  These will be called at suspend,
+      hibernate, or resume time, and should perform any state save or
+      restore required by your device across suspend or hibernate
+      states.
+    </para>
+  </sect1>
+
+  <sect1>
+    <title>DMA services</title>
+    <para>
+      This should cover how DMA mapping etc. is supported by the core.
+      These functions are deprecated and should not be used.
+    </para>
+  </sect1>
+  </chapter>
+
+  <!-- External interfaces -->
+
+  <chapter id="drmExternals">
+    <title>Userland interfaces</title>
+    <para>
+      The DRM core exports several interfaces to applications,
+      generally intended to be used through corresponding libdrm
+      wrapper functions.  In addition, drivers export device specific
+      interfaces for use by userspace drivers &amp; device aware
+      applications through ioctls and sysfs files.
+    </para>
+    <para>
+      External interfaces include: memory mapping, context management,
+      DMA operations, AGP management, vblank control, fence
+      management, memory management, and output management.
+    </para>
+    <para>
+      Cover generic ioctls and sysfs layout here.  Only need high
+      level info, since man pages will cover the rest.
+    </para>
+  </chapter>
+
+  <!-- API reference -->
+
+  <appendix id="drmDriverApi">
+    <title>DRM Driver API</title>
+    <para>
+      Include auto-generated API reference here (need to reference it
+      from paragraphs above too).
+    </para>
+  </appendix>
+
+</book>

Documentation/DocBook/dvb/dvbapi.xml

@@ -12,10 +12,12 @@
 <othername role="mi">O. C.</othername>
 <affiliation><address><email>rjkm@metzlerbros.de</email></address></affiliation>
 </author>
+</authorgroup>
+<authorgroup>
 <author>
 <firstname>Mauro</firstname>
-<surname>Chehab</surname>
 <othername role="mi">Carvalho</othername>
+<surname>Chehab</surname>
 <affiliation><address><email>mchehab@redhat.com</email></address></affiliation>
 <contrib>Ported document to Docbook XML.</contrib>
 </author>
@@ -23,12 +25,23 @@
 <copyright>
 	<year>2002</year>
 	<year>2003</year>
-	<year>2009</year>
 	<holder>Convergence GmbH</holder>
 </copyright>
+<copyright>
+	<year>2009-2010</year>
+	<holder>Mauro Carvalho Chehab</holder>
+</copyright>
 
 <revhistory>
 <!-- Put document revisions here, newest first. -->
+<revision>
+	<revnumber>2.0.3</revnumber>
+	<date>2010-07-03</date>
+	<authorinitials>mcc</authorinitials>
+	<revremark>
+		Add some frontend capabilities flags, present on kernel, but missing at the specs.
+	</revremark>
+</revision>
 <revision>
 	<revnumber>2.0.2</revnumber>
 	<date>2009-10-25</date>
@@ -63,7 +76,7 @@ Added ISDB-T test originally written by Patrick Boettcher
 
 
 <title>LINUX DVB API</title>
-<subtitle>Version 3</subtitle>
+<subtitle>Version 5.2</subtitle>
 <!-- ADD THE CHAPTERS HERE -->
   <chapter id="dvb_introdution">
     &sub-intro;

Documentation/DocBook/dvb/frontend.h.xml

@@ -63,6 +63,7 @@ typedef enum fe_caps {
         FE_CAN_8VSB                     = 0x200000,
         FE_CAN_16VSB                    = 0x400000,
         FE_HAS_EXTENDED_CAPS            = 0x800000,   /* We need more bitspace for newer APIs, indicate this. */
+        FE_CAN_TURBO_FEC                = 0x8000000,  /* frontend supports "turbo fec modulation" */
         FE_CAN_2G_MODULATION            = 0x10000000, /* frontend supports "2nd generation modulation" (DVB-S2) */
         FE_NEEDS_BENDING                = 0x20000000, /* not supported anymore, don't use (frontend requires frequency bending) */
         FE_CAN_RECOVER                  = 0x40000000, /* frontend can recover from a cable unplug automatically */

Documentation/DocBook/dvb/frontend.xml

@@ -64,8 +64,14 @@ a specific frontend type.</para>
 	FE_CAN_BANDWIDTH_AUTO         = 0x40000,
 	FE_CAN_GUARD_INTERVAL_AUTO    = 0x80000,
 	FE_CAN_HIERARCHY_AUTO         = 0x100000,
-	FE_CAN_MUTE_TS                = 0x80000000,
-	FE_CAN_CLEAN_SETUP            = 0x40000000
+	FE_CAN_8VSB                   = 0x200000,
+	FE_CAN_16VSB                  = 0x400000,
+	FE_HAS_EXTENDED_CAPS          = 0x800000,
+	FE_CAN_TURBO_FEC              = 0x8000000,
+	FE_CAN_2G_MODULATION          = 0x10000000,
+	FE_NEEDS_BENDING              = 0x20000000,
+	FE_CAN_RECOVER                = 0x40000000,
+	FE_CAN_MUTE_TS                = 0x80000000
 	} fe_caps_t;
 </programlisting>
 </section>

Documentation/DocBook/kernel-api.tmpl

@@ -57,7 +57,6 @@
      </para>
 
      <sect1><title>String Conversions</title>
-!Ilib/vsprintf.c
 !Elib/vsprintf.c
      </sect1>
      <sect1><title>String Manipulation</title>
@@ -132,7 +131,6 @@ X!Ilib/string.c
      <title>FIFO Buffer</title>
      <sect1><title>kfifo interface</title>
 !Iinclude/linux/kfifo.h
-!Ekernel/kfifo.c
      </sect1>
   </chapter>
 

Documentation/DocBook/kernel-locking.tmpl

@@ -1922,9 +1922,12 @@ machines due to caching.
       <function>mutex_lock()</function>
       </para>
       <para>
-       There is a <function>mutex_trylock()</function> which can be
-       used inside interrupt context, as it will not sleep.
+       There is a <function>mutex_trylock()</function> which does not
+       sleep.  Still, it must not be used inside interrupt context since
+       its implementation is not safe for that.
        <function>mutex_unlock()</function> will also never sleep.
+       It cannot be used in interrupt context either since a mutex
+       must be released by the same task that acquired it.
       </para>
      </listitem>
     </itemizedlist>
@@ -1958,6 +1961,12 @@ machines due to caching.
    </sect1>
   </chapter>
 
+  <chapter id="apiref">
+   <title>Mutex API reference</title>
+!Iinclude/linux/mutex.h
+!Ekernel/mutex.c
+  </chapter>
+
   <chapter id="references">
    <title>Further reading</title>
 

Documentation/DocBook/kgdb.tmpl

@@ -4,7 +4,7 @@
 
 <book id="kgdbOnLinux">
  <bookinfo>
-  <title>Using kgdb and the kgdb Internals</title>
+  <title>Using kgdb, kdb and the kernel debugger internals</title>
 
   <authorgroup>
    <author>
@@ -17,33 +17,8 @@
     </affiliation>
    </author>
   </authorgroup>
-
-  <authorgroup>
-   <author>
-    <firstname>Tom</firstname>
-    <surname>Rini</surname>
-    <affiliation>
-     <address>
-      <email>trini@kernel.crashing.org</email>
-     </address>
-    </affiliation>
-   </author>
-  </authorgroup>
-
-  <authorgroup>
-   <author>
-    <firstname>Amit S.</firstname>
-    <surname>Kale</surname>
-    <affiliation>
-     <address>
-      <email>amitkale@linsyssoft.com</email>
-     </address>
-    </affiliation>
-   </author>
-  </authorgroup>
-
   <copyright>
-   <year>2008</year>
+   <year>2008,2010</year>
    <holder>Wind River Systems, Inc.</holder>
   </copyright>
   <copyright>
@@ -69,41 +44,76 @@
   <chapter id="Introduction">
     <title>Introduction</title>
     <para>
-    kgdb is a source level debugger for linux kernel. It is used along
-    with gdb to debug a linux kernel.  The expectation is that gdb can
-    be used to "break in" to the kernel to inspect memory, variables
-    and look through call stack information similar to what an
-    application developer would use gdb for.  It is possible to place
-    breakpoints in kernel code and perform some limited execution
-    stepping.
+    The kernel has two different debugger front ends (kdb and kgdb)
+    which interface to the debug core.  It is possible to use either
+    of the debugger front ends and dynamically transition between them
+    if you configure the kernel properly at compile and runtime.
+    </para>
+    <para>
+    Kdb is simplistic shell-style interface which you can use on a
+    system console with a keyboard or serial console.  You can use it
+    to inspect memory, registers, process lists, dmesg, and even set
+    breakpoints to stop in a certain location.  Kdb is not a source
+    level debugger, although you can set breakpoints and execute some
+    basic kernel run control.  Kdb is mainly aimed at doing some
+    analysis to aid in development or diagnosing kernel problems.  You
+    can access some symbols by name in kernel built-ins or in kernel
+    modules if the code was built
+    with <symbol>CONFIG_KALLSYMS</symbol>.
+    </para>
+    <para>
+    Kgdb is intended to be used as a source level debugger for the
+    Linux kernel. It is used along with gdb to debug a Linux kernel.
+    The expectation is that gdb can be used to "break in" to the
+    kernel to inspect memory, variables and look through call stack
+    information similar to the way an application developer would use
+    gdb to debug an application.  It is possible to place breakpoints
+    in kernel code and perform some limited execution stepping.
     </para>
     <para>
-    Two machines are required for using kgdb. One of these machines is a
-    development machine and the other is a test machine.  The kernel
-    to be debugged runs on the test machine. The development machine
-    runs an instance of gdb against the vmlinux file which contains
-    the symbols (not boot image such as bzImage, zImage, uImage...).
-    In gdb the developer specifies the connection parameters and
-    connects to kgdb.  The type of connection a developer makes with
-    gdb depends on the availability of kgdb I/O modules compiled as
-    builtin's or kernel modules in the test machine's kernel.
+    Two machines are required for using kgdb. One of these machines is
+    a development machine and the other is the target machine.  The
+    kernel to be debugged runs on the target machine. The development
+    machine runs an instance of gdb against the vmlinux file which
+    contains the symbols (not boot image such as bzImage, zImage,
+    uImage...).  In gdb the developer specifies the connection
+    parameters and connects to kgdb.  The type of connection a
+    developer makes with gdb depends on the availability of kgdb I/O
+    modules compiled as built-ins or loadable kernel modules in the test
+    machine's kernel.
     </para>
   </chapter>
   <chapter id="CompilingAKernel">
-    <title>Compiling a kernel</title>
+  <title>Compiling a kernel</title>
+  <para>
+  <itemizedlist>
+  <listitem><para>In order to enable compilation of kdb, you must first enable kgdb.</para></listitem>
+  <listitem><para>The kgdb test compile options are described in the kgdb test suite chapter.</para></listitem>
+  </itemizedlist>
+  </para>
+  <sect1 id="CompileKGDB">
+    <title>Kernel config options for kgdb</title>
     <para>
     To enable <symbol>CONFIG_KGDB</symbol> you should first turn on
     "Prompt for development and/or incomplete code/drivers"
     (CONFIG_EXPERIMENTAL) in  "General setup", then under the
-    "Kernel debugging" select "KGDB: kernel debugging with remote gdb".
+    "Kernel debugging" select "KGDB: kernel debugger".
+    </para>
+    <para>
+    While it is not a hard requirement that you have symbols in your
+    vmlinux file, gdb tends not to be very useful without the symbolic
+    data, so you will want to turn
+    on <symbol>CONFIG_DEBUG_INFO</symbol> which is called "Compile the
+    kernel with debug info" in the config menu.
     </para>
     <para>
     It is advised, but not required that you turn on the
-    CONFIG_FRAME_POINTER kernel option.  This option inserts code to
-    into the compiled executable which saves the frame information in
-    registers or on the stack at different points which will allow a
-    debugger such as gdb to more accurately construct stack back traces
-    while debugging the kernel.
+    <symbol>CONFIG_FRAME_POINTER</symbol> kernel option which is called "Compile the
+    kernel with frame pointers" in the config menu.  This option
+    inserts code to into the compiled executable which saves the frame
+    information in registers or on the stack at different points which
+    allows a debugger such as gdb to more accurately construct
+    stack back traces while debugging the kernel.
     </para>
     <para>
     If the architecture that you are using supports the kernel option
@@ -116,38 +126,192 @@
     this option.
     </para>
     <para>
-    Next you should choose one of more I/O drivers to interconnect debugging
-    host and debugged target.  Early boot debugging requires a KGDB
-    I/O driver that supports early debugging and the driver must be
-    built into the kernel directly. Kgdb I/O driver configuration
-    takes place via kernel or module parameters, see following
-    chapter.
+    Next you should choose one of more I/O drivers to interconnect
+    debugging host and debugged target.  Early boot debugging requires
+    a KGDB I/O driver that supports early debugging and the driver
+    must be built into the kernel directly. Kgdb I/O driver
+    configuration takes place via kernel or module parameters which
+    you can learn more about in the in the section that describes the
+    parameter "kgdboc".
     </para>
-    <para>
-    The kgdb test compile options are described in the kgdb test suite chapter.
+    <para>Here is an example set of .config symbols to enable or
+    disable for kgdb:
+    <itemizedlist>
+    <listitem><para># CONFIG_DEBUG_RODATA is not set</para></listitem>
+    <listitem><para>CONFIG_FRAME_POINTER=y</para></listitem>
+    <listitem><para>CONFIG_KGDB=y</para></listitem>
+    <listitem><para>CONFIG_KGDB_SERIAL_CONSOLE=y</para></listitem>
+    </itemizedlist>
     </para>
-
+  </sect1>
+  <sect1 id="CompileKDB">
+    <title>Kernel config options for kdb</title>
+    <para>Kdb is quite a bit more complex than the simple gdbstub
+    sitting on top of the kernel's debug core.  Kdb must implement a
+    shell, and also adds some helper functions in other parts of the
+    kernel, responsible for printing out interesting data such as what
+    you would see if you ran "lsmod", or "ps".  In order to build kdb
+    into the kernel you follow the same steps as you would for kgdb.
+    </para>
+    <para>The main config option for kdb
+    is <symbol>CONFIG_KGDB_KDB</symbol> which is called "KGDB_KDB:
+    include kdb frontend for kgdb" in the config menu.  In theory you
+    would have already also selected an I/O driver such as the
+    CONFIG_KGDB_SERIAL_CONSOLE interface if you plan on using kdb on a
+    serial port, when you were configuring kgdb.
+    </para>
+    <para>If you want to use a PS/2-style keyboard with kdb, you would
+    select CONFIG_KDB_KEYBOARD which is called "KGDB_KDB: keyboard as
+    input device" in the config menu.  The CONFIG_KDB_KEYBOARD option
+    is not used for anything in the gdb interface to kgdb.  The
+    CONFIG_KDB_KEYBOARD option only works with kdb.
+    </para>
+    <para>Here is an example set of .config symbols to enable/disable kdb:
+    <itemizedlist>
+    <listitem><para># CONFIG_DEBUG_RODATA is not set</para></listitem>
+    <listitem><para>CONFIG_FRAME_POINTER=y</para></listitem>
+    <listitem><para>CONFIG_KGDB=y</para></listitem>
+    <listitem><para>CONFIG_KGDB_SERIAL_CONSOLE=y</para></listitem>
+    <listitem><para>CONFIG_KGDB_KDB=y</para></listitem>
+    <listitem><para>CONFIG_KDB_KEYBOARD=y</para></listitem>
+    </itemizedlist>
+    </para>
+  </sect1>
   </chapter>
-  <chapter id="EnableKGDB">
-   <title>Enable kgdb for debugging</title>
-   <para>
-   In order to use kgdb you must activate it by passing configuration
-   information to one of the kgdb I/O drivers.  If you do not pass any
-   configuration information kgdb will not do anything at all.  Kgdb
-   will only actively hook up to the kernel trap hooks if a kgdb I/O
-   driver is loaded and configured.  If you unconfigure a kgdb I/O
-   driver, kgdb will unregister all the kernel hook points.
+  <chapter id="kgdbKernelArgs">
+  <title>Kernel Debugger Boot Arguments</title>
+  <para>This section describes the various runtime kernel
+  parameters that affect the configuration of the kernel debugger.
+  The following chapter covers using kdb and kgdb as well as
+  provides some examples of the configuration parameters.</para>
+   <sect1 id="kgdboc">
+   <title>Kernel parameter: kgdboc</title>
+   <para>The kgdboc driver was originally an abbreviation meant to
+   stand for "kgdb over console".  Today it is the primary mechanism
+   to configure how to communicate from gdb to kgdb as well as the
+   devices you want to use to interact with the kdb shell.
+   </para>
+   <para>For kgdb/gdb, kgdboc is designed to work with a single serial
+   port. It is intended to cover the circumstance where you want to
+   use a serial console as your primary console as well as using it to
+   perform kernel debugging.  It is also possible to use kgdb on a
+   serial port which is not designated as a system console.  Kgdboc
+   may be configured as a kernel built-in or a kernel loadable module.
+   You can only make use of <constant>kgdbwait</constant> and early
+   debugging if you build kgdboc into the kernel as a built-in.
+   <para>Optionally you can elect to activate kms (Kernel Mode
+   Setting) integration.  When you use kms with kgdboc and you have a
+   video driver that has atomic mode setting hooks, it is possible to
+   enter the debugger on the graphics console.  When the kernel
+   execution is resumed, the previous graphics mode will be restored.
+   This integration can serve as a useful tool to aid in diagnosing
+   crashes or doing analysis of memory with kdb while allowing the
+   full graphics console applications to run.
+   </para>
+   </para>
+   <sect2 id="kgdbocArgs">
+   <title>kgdboc arguments</title>
+   <para>Usage: <constant>kgdboc=[kms][[,]kbd][[,]serial_device][,baud]</constant></para>
+   <para>The order listed above must be observed if you use any of the
+   optional configurations together.
    </para>
+   <para>Abbreviations:
+   <itemizedlist>
+   <listitem><para>kms = Kernel Mode Setting</para></listitem>
+   <listitem><para>kbd = Keyboard</para></listitem>
+   </itemizedlist>
+   </para>
+   <para>You can configure kgdboc to use the keyboard, and or a serial
+   device depending on if you are using kdb and or kgdb, in one of the
+   following scenarios.  The order listed above must be observed if
+   you use any of the optional configurations together.  Using kms +
+   only gdb is generally not a useful combination.</para>
+   <sect3 id="kgdbocArgs1">
+   <title>Using loadable module or built-in</title>
    <para>
-   All drivers can be reconfigured at run time, if
-   <symbol>CONFIG_SYSFS</symbol> and <symbol>CONFIG_MODULES</symbol>
-   are enabled, by echo'ing a new config string to
-   <constant>/sys/module/&lt;driver&gt;/parameter/&lt;option&gt;</constant>.
-   The driver can be unconfigured by passing an empty string.  You cannot
-   change the configuration while the debugger is attached.  Make sure
-   to detach the debugger with the <constant>detach</constant> command
-   prior to trying unconfigure a kgdb I/O driver.
+   <orderedlist>
+   <listitem><para>As a kernel built-in:</para>
+   <para>Use the kernel boot argument: <constant>kgdboc=&lt;tty-device&gt;,[baud]</constant></para></listitem>
+   <listitem>
+   <para>As a kernel loadable module:</para>
+   <para>Use the command: <constant>modprobe kgdboc kgdboc=&lt;tty-device&gt;,[baud]</constant></para>
+   <para>Here are two examples of how you might format the kgdboc
+   string. The first is for an x86 target using the first serial port.
+   The second example is for the ARM Versatile AB using the second
+   serial port.
+   <orderedlist>
+   <listitem><para><constant>kgdboc=ttyS0,115200</constant></para></listitem>
+   <listitem><para><constant>kgdboc=ttyAMA1,115200</constant></para></listitem>
+   </orderedlist>
+   </para>
+   </listitem>
+   </orderedlist></para>
+   </sect3>
+   <sect3 id="kgdbocArgs2">
+   <title>Configure kgdboc at runtime with sysfs</title>
+   <para>At run time you can enable or disable kgdboc by echoing a
+   parameters into the sysfs.  Here are two examples:</para>
+   <orderedlist>
+   <listitem><para>Enable kgdboc on ttyS0</para>
+   <para><constant>echo ttyS0 &gt; /sys/module/kgdboc/parameters/kgdboc</constant></para></listitem>
+   <listitem><para>Disable kgdboc</para>
+   <para><constant>echo "" &gt; /sys/module/kgdboc/parameters/kgdboc</constant></para></listitem>
+   </orderedlist>
+   <para>NOTE: You do not need to specify the baud if you are
+   configuring the console on tty which is already configured or
+   open.</para>
+   </sect3>
+   <sect3 id="kgdbocArgs3">
+   <title>More examples</title>
+   <para>You can configure kgdboc to use the keyboard, and or a serial
+   device depending on if you are using kdb and or kgdb, in one of the
+   following scenarios.</para>
+   <para>You can configure kgdboc to use the keyboard, and or a serial device
+   depending on if you are using kdb and or kgdb, in one of the
+   following scenarios.
+   <orderedlist>
+   <listitem><para>kdb and kgdb over only a serial port</para>
+   <para><constant>kgdboc=&lt;serial_device&gt;[,baud]</constant></para>
+   <para>Example: <constant>kgdboc=ttyS0,115200</constant></para>
+   </listitem>
+   <listitem><para>kdb and kgdb with keyboard and a serial port</para>
+   <para><constant>kgdboc=kbd,&lt;serial_device&gt;[,baud]</constant></para>
+   <para>Example: <constant>kgdboc=kbd,ttyS0,115200</constant></para>
+   </listitem>
+   <listitem><para>kdb with a keyboard</para>
+   <para><constant>kgdboc=kbd</constant></para>
+   </listitem>
+   <listitem><para>kdb with kernel mode setting</para>
+   <para><constant>kgdboc=kms,kbd</constant></para>
+   </listitem>
+   <listitem><para>kdb with kernel mode setting and kgdb over a serial port</para>
+   <para><constant>kgdboc=kms,kbd,ttyS0,115200</constant></para>
+   </listitem>
+   </orderedlist>
+   </para>
+   </sect3>
+   <para>NOTE: Kgdboc does not support interrupting the target via the
+   gdb remote protocol.  You must manually send a sysrq-g unless you
+   have a proxy that splits console output to a terminal program.
+   A console proxy has a separate TCP port for the debugger and a separate
+   TCP port for the "human" console.  The proxy can take care of sending
+   the sysrq-g for you.
    </para>
+   <para>When using kgdboc with no debugger proxy, you can end up
+    connecting the debugger at one of two entry points.  If an
+    exception occurs after you have loaded kgdboc, a message should
+    print on the console stating it is waiting for the debugger.  In
+    this case you disconnect your terminal program and then connect the
+    debugger in its place.  If you want to interrupt the target system
+    and forcibly enter a debug session you have to issue a Sysrq
+    sequence and then type the letter <constant>g</constant>.  Then
+    you disconnect the terminal session and connect gdb.  Your options
+    if you don't like this are to hack gdb to send the sysrq-g for you
+    as well as on the initial connect, or to use a debugger proxy that
+    allows an unmodified gdb to do the debugging.
+   </para>
+   </sect2>
+   </sect1>
    <sect1 id="kgdbwait">
    <title>Kernel parameter: kgdbwait</title>
    <para>
@@ -162,103 +326,204 @@
    </para>
    <para>
    The kernel will stop and wait as early as the I/O driver and
-   architecture will allow when you use this option.  If you build the
-   kgdb I/O driver as a kernel module kgdbwait will not do anything.
+   architecture allows when you use this option.  If you build the
+   kgdb I/O driver as a loadable kernel module kgdbwait will not do
+   anything.
    </para>
    </sect1>
-  <sect1 id="kgdboc">
-  <title>Kernel parameter: kgdboc</title>
-  <para>
-  The kgdboc driver was originally an abbreviation meant to stand for
-  "kgdb over console".  Kgdboc is designed to work with a single
-  serial port. It was meant to cover the circumstance
-  where you wanted to use a serial console as your primary console as
-  well as using it to perform kernel debugging.  Of course you can
-  also use kgdboc without assigning a console to the same port.
+   <sect1 id="kgdbcon">
+   <title>Kernel parameter: kgdbcon</title>
+   <para> The kgdbcon feature allows you to see printk() messages
+   inside gdb while gdb is connected to the kernel.  Kdb does not make
+    use of the kgdbcon feature.
+   </para>
+   <para>Kgdb supports using the gdb serial protocol to send console
+   messages to the debugger when the debugger is connected and running.
+   There are two ways to activate this feature.
+   <orderedlist>
+   <listitem><para>Activate with the kernel command line option:</para>
+   <para><constant>kgdbcon</constant></para>
+   </listitem>
+   <listitem><para>Use sysfs before configuring an I/O driver</para>
+   <para>
+   <constant>echo 1 &gt; /sys/module/kgdb/parameters/kgdb_use_con</constant>
+   </para>
+   <para>
+   NOTE: If you do this after you configure the kgdb I/O driver, the
+   setting will not take effect until the next point the I/O is
+   reconfigured.
+   </para>
+   </listitem>
+   </orderedlist>
+   <para>IMPORTANT NOTE: You cannot use kgdboc + kgdbcon on a tty that is an
+   active system console.  An example incorrect usage is <constant>console=ttyS0,115200 kgdboc=ttyS0 kgdbcon</constant>
+   </para>
+   <para>It is possible to use this option with kgdboc on a tty that is not a system console.
+   </para>
   </para>
-  <sect2 id="UsingKgdboc">
-  <title>Using kgdboc</title>
-  <para>
-  You can configure kgdboc via sysfs or a module or kernel boot line
-  parameter depending on if you build with CONFIG_KGDBOC as a module
-  or built-in.
-  <orderedlist>
-  <listitem><para>From the module load or build-in</para>
-  <para><constant>kgdboc=&lt;tty-device&gt;,[baud]</constant></para>
+  </sect1>
+  </chapter>
+  <chapter id="usingKDB">
+  <title>Using kdb</title>
   <para>
-  The example here would be if your console port was typically ttyS0, you would use something like <constant>kgdboc=ttyS0,115200</constant> or on the ARM Versatile AB you would likely use <constant>kgdboc=ttyAMA0,115200</constant>
+  </para>
+  <sect1 id="quickKDBserial">
+  <title>Quick start for kdb on a serial port</title>
+  <para>This is a quick example of how to use kdb.</para>
+  <para><orderedlist>
+  <listitem><para>Boot kernel with arguments:
+  <itemizedlist>
+  <listitem><para><constant>console=ttyS0,115200 kgdboc=ttyS0,115200</constant></para></listitem>
+  </itemizedlist></para>
+  <para>OR</para>
+  <para>Configure kgdboc after the kernel booted; assuming you are using a serial port console:
+  <itemizedlist>
+  <listitem><para><constant>echo ttyS0 &gt; /sys/module/kgdboc/parameters/kgdboc</constant></para></listitem>
+  </itemizedlist>
   </para>
   </listitem>
-  <listitem><para>From sysfs</para>
-  <para><constant>echo ttyS0 &gt; /sys/module/kgdboc/parameters/kgdboc</constant></para>
+  <listitem><para>Enter the kernel debugger manually or by waiting for an oops or fault.  There are several ways you can enter the kernel debugger manually; all involve using the sysrq-g, which means you must have enabled CONFIG_MAGIC_SYSRQ=y in your kernel config.</para>
+  <itemizedlist>
+  <listitem><para>When logged in as root or with a super user session you can run:</para>
+   <para><constant>echo g &gt; /proc/sysrq-trigger</constant></para></listitem>
+  <listitem><para>Example using minicom 2.2</para>
+  <para>Press: <constant>Control-a</constant></para>
+  <para>Press: <constant>f</constant></para>
+  <para>Press: <constant>g</constant></para>
   </listitem>
-  </orderedlist>
-  </para>
-  <para>
-  NOTE: Kgdboc does not support interrupting the target via the
-  gdb remote protocol.  You must manually send a sysrq-g unless you
-  have a proxy that splits console output to a terminal problem and
-  has a separate port for the debugger to connect to that sends the
-  sysrq-g for you.
+  <listitem><para>When you have telneted to a terminal server that supports sending a remote break</para>
+  <para>Press: <constant>Control-]</constant></para>
+  <para>Type in:<constant>send break</constant></para>
+  <para>Press: <constant>Enter</constant></para>
+  <para>Press: <constant>g</constant></para>
+  </listitem>
+  </itemizedlist>
+  </listitem>
+  <listitem><para>From the kdb prompt you can run the "help" command to see a complete list of the commands that are available.</para>
+  <para>Some useful commands in kdb include:
+  <itemizedlist>
+  <listitem><para>lsmod  -- Shows where kernel modules are loaded</para></listitem>
+  <listitem><para>ps -- Displays only the active processes</para></listitem>
+  <listitem><para>ps A -- Shows all the processes</para></listitem>
+  <listitem><para>summary -- Shows kernel version info and memory usage</para></listitem>
+  <listitem><para>bt -- Get a backtrace of the current process using dump_stack()</para></listitem>
+  <listitem><para>dmesg -- View the kernel syslog buffer</para></listitem>
+  <listitem><para>go -- Continue the system</para></listitem>
+  </itemizedlist>
   </para>
-  <para>When using kgdboc with no debugger proxy, you can end up
-  connecting the debugger for one of two entry points.  If an
-  exception occurs after you have loaded kgdboc a message should print
-  on the console stating it is waiting for the debugger.  In case you
-  disconnect your terminal program and then connect the debugger in
-  its place.  If you want to interrupt the target system and forcibly
-  enter a debug session you have to issue a Sysrq sequence and then
-  type the letter <constant>g</constant>.  Then you disconnect the
-  terminal session and connect gdb.  Your options if you don't like
-  this are to hack gdb to send the sysrq-g for you as well as on the
-  initial connect, or to use a debugger proxy that allows an
-  unmodified gdb to do the debugging.
+  </listitem>
+  <listitem>
+  <para>When you are done using kdb you need to consider rebooting the
+  system or using the "go" command to resuming normal kernel
+  execution.  If you have paused the kernel for a lengthy period of
+  time, applications that rely on timely networking or anything to do
+  with real wall clock time could be adversely affected, so you
+  should take this into consideration when using the kernel
+  debugger.</para>
+  </listitem>
+  </orderedlist></para>
+  </sect1>
+  <sect1 id="quickKDBkeyboard">
+  <title>Quick start for kdb using a keyboard connected console</title>
+  <para>This is a quick example of how to use kdb with a keyboard.</para>
+  <para><orderedlist>
+  <listitem><para>Boot kernel with arguments:
+  <itemizedlist>
+  <listitem><para><constant>kgdboc=kbd</constant></para></listitem>
+  </itemizedlist></para>
+  <para>OR</para>
+  <para>Configure kgdboc after the kernel booted:
+  <itemizedlist>
+  <listitem><para><constant>echo kbd &gt; /sys/module/kgdboc/parameters/kgdboc</constant></para></listitem>
+  </itemizedlist>
   </para>
-  </sect2>
+  </listitem>
+  <listitem><para>Enter the kernel debugger manually or by waiting for an oops or fault.  There are several ways you can enter the kernel debugger manually; all involve using the sysrq-g, which means you must have enabled CONFIG_MAGIC_SYSRQ=y in your kernel config.</para>
+  <itemizedlist>
+  <listitem><para>When logged in as root or with a super user session you can run:</para>
+   <para><constant>echo g &gt; /proc/sysrq-trigger</constant></para></listitem>
+  <listitem><para>Example using a laptop keyboard</para>
+  <para>Press and hold down: <constant>Alt</constant></para>
+  <para>Press and hold down: <constant>Fn</constant></para>
+  <para>Press and release the key with the label: <constant>SysRq</constant></para>
+  <para>Release: <constant>Fn</constant></para>
+  <para>Press and release: <constant>g</constant></para>
+  <para>Release: <constant>Alt</constant></para>
+  </listitem>
+  <listitem><para>Example using a PS/2 101-key keyboard</para>
+  <para>Press and hold down: <constant>Alt</constant></para>
+  <para>Press and release the key with the label: <constant>SysRq</constant></para>
+  <para>Press and release: <constant>g</constant></para>
+  <para>Release: <constant>Alt</constant></para>
+  </listitem>
+  </itemizedlist>
+  </listitem>
+  <listitem>
+  <para>Now type in a kdb command such as "help", "dmesg", "bt" or "go" to continue kernel execution.</para>
+  </listitem>
+  </orderedlist></para>
   </sect1>
-  <sect1 id="kgdbcon">
-  <title>Kernel parameter: kgdbcon</title>
-  <para>
-  Kgdb supports using the gdb serial protocol to send console messages
-  to the debugger when the debugger is connected and running.  There
-  are two ways to activate this feature.
+  </chapter>
+  <chapter id="EnableKGDB">
+   <title>Using kgdb / gdb</title>
+   <para>In order to use kgdb you must activate it by passing
+   configuration information to one of the kgdb I/O drivers.  If you
+   do not pass any configuration information kgdb will not do anything
+   at all.  Kgdb will only actively hook up to the kernel trap hooks
+   if a kgdb I/O driver is loaded and configured.  If you unconfigure
+   a kgdb I/O driver, kgdb will unregister all the kernel hook points.
+   </para>
+   <para> All kgdb I/O drivers can be reconfigured at run time, if
+   <symbol>CONFIG_SYSFS</symbol> and <symbol>CONFIG_MODULES</symbol>
+   are enabled, by echo'ing a new config string to
+   <constant>/sys/module/&lt;driver&gt;/parameter/&lt;option&gt;</constant>.
+   The driver can be unconfigured by passing an empty string.  You cannot
+   change the configuration while the debugger is attached.  Make sure
+   to detach the debugger with the <constant>detach</constant> command
+   prior to trying to unconfigure a kgdb I/O driver.
+   </para>
+  <sect1 id="ConnectingGDB">
+  <title>Connecting with gdb to a serial port</title>
   <orderedlist>
-  <listitem><para>Activate with the kernel command line option:</para>
-  <para><constant>kgdbcon</constant></para>
+  <listitem><para>Configure kgdboc</para>
+   <para>Boot kernel with arguments:
+   <itemizedlist>
+    <listitem><para><constant>kgdboc=ttyS0,115200</constant></para></listitem>
+   </itemizedlist></para>
+   <para>OR</para>
+   <para>Configure kgdboc after the kernel booted:
+   <itemizedlist>
+    <listitem><para><constant>echo ttyS0 &gt; /sys/module/kgdboc/parameters/kgdboc</constant></para></listitem>
+   </itemizedlist></para>
   </listitem>
-  <listitem><para>Use sysfs before configuring an io driver</para>
-  <para>
-  <constant>echo 1 &gt; /sys/module/kgdb/parameters/kgdb_use_con</constant>
-  </para>
-  <para>
-  NOTE: If you do this after you configure the kgdb I/O driver, the
-  setting will not take effect until the next point the I/O is
-  reconfigured.
-  </para>
+  <listitem>
+  <para>Stop kernel execution (break into the debugger)</para>
+  <para>In order to connect to gdb via kgdboc, the kernel must
+  first be stopped.  There are several ways to stop the kernel which
+  include using kgdbwait as a boot argument, via a sysrq-g, or running
+  the kernel until it takes an exception where it waits for the
+  debugger to attach.
+  <itemizedlist>
+  <listitem><para>When logged in as root or with a super user session you can run:</para>
+   <para><constant>echo g &gt; /proc/sysrq-trigger</constant></para></listitem>
+  <listitem><para>Example using minicom 2.2</para>
+  <para>Press: <constant>Control-a</constant></para>
+  <para>Press: <constant>f</constant></para>
+  <para>Press: <constant>g</constant></para>
   </listitem>
-  </orderedlist>
-  </para>
-  <para>
-  IMPORTANT NOTE: Using this option with kgdb over the console
-  (kgdboc) is not supported.
+  <listitem><para>When you have telneted to a terminal server that supports sending a remote break</para>
+  <para>Press: <constant>Control-]</constant></para>
+  <para>Type in:<constant>send break</constant></para>
+  <para>Press: <constant>Enter</constant></para>
+  <para>Press: <constant>g</constant></para>
+  </listitem>
+  </itemizedlist>
   </para>
-  </sect1>
-  </chapter>
-  <chapter id="ConnectingGDB">
-  <title>Connecting gdb</title>
-    <para>
-    If you are using kgdboc, you need to have used kgdbwait as a boot
-    argument, issued a sysrq-g, or the system you are going to debug
-    has already taken an exception and is waiting for the debugger to
-    attach before you can connect gdb.
-    </para>
-    <para>
-    If you are not using different kgdb I/O driver other than kgdboc,
-    you should be able to connect and the target will automatically
-    respond.
-    </para>
+  </listitem>
+  <listitem>
+    <para>Connect from from gdb</para>
     <para>
-    Example (using a serial port):
+    Example (using a directly connected port):
     </para>
     <programlisting>
     % gdb ./vmlinux
@@ -266,7 +531,7 @@
     (gdb) target remote /dev/ttyS0
     </programlisting>
     <para>
-    Example (kgdb to a terminal server on tcp port 2012):
+    Example (kgdb to a terminal server on TCP port 2012):
     </para>
     <programlisting>
     % gdb ./vmlinux
@@ -283,6 +548,83 @@
     communications.  You do this prior to issuing the <constant>target
     remote</constant> command by typing in: <constant>set debug remote 1</constant>
     </para>
+  </listitem>
+  </orderedlist>
+  <para>Remember if you continue in gdb, and need to "break in" again,
+  you need to issue an other sysrq-g.  It is easy to create a simple
+  entry point by putting a breakpoint at <constant>sys_sync</constant>
+  and then you can run "sync" from a shell or script to break into the
+  debugger.</para>
+  </sect1>
+  </chapter>
+  <chapter id="switchKdbKgdb">
+  <title>kgdb and kdb interoperability</title>
+  <para>It is possible to transition between kdb and kgdb dynamically.
+  The debug core will remember which you used the last time and
+  automatically start in the same mode.</para>
+  <sect1>
+  <title>Switching between kdb and kgdb</title>
+  <sect2>
+  <title>Switching from kgdb to kdb</title>
+  <para>
+  There are two ways to switch from kgdb to kdb: you can use gdb to
+  issue a maintenance packet, or you can blindly type the command $3#33.
+  Whenever kernel debugger stops in kgdb mode it will print the
+  message <constant>KGDB or $3#33 for KDB</constant>.  It is important
+  to note that you have to type the sequence correctly in one pass.
+  You cannot type a backspace or delete because kgdb will interpret
+  that as part of the debug stream.
+  <orderedlist>
+  <listitem><para>Change from kgdb to kdb by blindly typing:</para>
+  <para><constant>$3#33</constant></para></listitem>
+  <listitem><para>Change from kgdb to kdb with gdb</para>
+  <para><constant>maintenance packet 3</constant></para>
+  <para>NOTE: Now you must kill gdb. Typically you press control-z and
+  issue the command: kill -9 %</para></listitem>
+  </orderedlist>
+  </para>
+  </sect2>
+  <sect2>
+  <title>Change from kdb to kgdb</title>
+  <para>There are two ways you can change from kdb to kgdb.  You can
+  manually enter kgdb mode by issuing the kgdb command from the kdb
+  shell prompt, or you can connect gdb while the kdb shell prompt is
+  active.  The kdb shell looks for the typical first commands that gdb
+  would issue with the gdb remote protocol and if it sees one of those
+  commands it automatically changes into kgdb mode.</para>
+  <orderedlist>
+  <listitem><para>From kdb issue the command:</para>
+  <para><constant>kgdb</constant></para>
+  <para>Now disconnect your terminal program and connect gdb in its place</para></listitem>
+  <listitem><para>At the kdb prompt, disconnect the terminal program and connect gdb in its place.</para></listitem>
+  </orderedlist>
+  </sect2>
+  </sect1>
+  <sect1>
+  <title>Running kdb commands from gdb</title>
+  <para>It is possible to run a limited set of kdb commands from gdb,
+  using the gdb monitor command.  You don't want to execute any of the
+  run control or breakpoint operations, because it can disrupt the
+  state of the kernel debugger.  You should be using gdb for
+  breakpoints and run control operations if you have gdb connected.
+  The more useful commands to run are things like lsmod, dmesg, ps or
+  possibly some of the memory information commands.  To see all the kdb
+  commands you can run <constant>monitor help</constant>.</para>
+  <para>Example:
+  <informalexample><programlisting>
+(gdb) monitor ps
+1 idle process (state I) and
+27 sleeping system daemon (state M) processes suppressed,
+use 'ps A' to see all.
+Task Addr       Pid   Parent [*] cpu State Thread     Command
+
+0xc78291d0        1        0  0    0   S  0xc7829404  init
+0xc7954150      942        1  0    0   S  0xc7954384  dropbear
+0xc78789c0      944        1  0    0   S  0xc7878bf4  sh
+(gdb)
+  </programlisting></informalexample>
+  </para>
+  </sect1>
   </chapter>
   <chapter id="KGDBTestSuite">
     <title>kgdb Test Suite</title>
@@ -309,34 +651,38 @@
     </para>
   </chapter>
   <chapter id="CommonBackEndReq">
-  <title>KGDB Internals</title>
+  <title>Kernel Debugger Internals</title>
   <sect1 id="kgdbArchitecture">
     <title>Architecture Specifics</title>
       <para>
-      Kgdb is organized into three basic components:
+      The kernel debugger is organized into a number of components:
       <orderedlist>
-      <listitem><para>kgdb core</para>
+      <listitem><para>The debug core</para>
       <para>
-      The kgdb core is found in kernel/kgdb.c.  It contains:
+      The debug core is found in kernel/debugger/debug_core.c.  It contains:
       <itemizedlist>
-      <listitem><para>All the logic to implement the gdb serial protocol</para></listitem>
-      <listitem><para>A generic OS exception handler which includes sync'ing the processors into a stopped state on an multi cpu system.</para></listitem>
+      <listitem><para>A generic OS exception handler which includes
+      sync'ing the processors into a stopped state on an multi-CPU
+      system.</para></listitem>
       <listitem><para>The API to talk to the kgdb I/O drivers</para></listitem>
-      <listitem><para>The API to make calls to the arch specific kgdb implementation</para></listitem>
+      <listitem><para>The API to make calls to the arch-specific kgdb implementation</para></listitem>
       <listitem><para>The logic to perform safe memory reads and writes to memory while using the debugger</para></listitem>
       <listitem><para>A full implementation for software breakpoints unless overridden by the arch</para></listitem>
+      <listitem><para>The API to invoke either the kdb or kgdb frontend to the debug core.</para></listitem>
+      <listitem><para>The structures and callback API for atomic kernel mode setting.</para>
+      <para>NOTE: kgdboc is where the kms callbacks are invoked.</para></listitem>
       </itemizedlist>
       </para>
       </listitem>
-      <listitem><para>kgdb arch specific implementation</para>
+      <listitem><para>kgdb arch-specific implementation</para>
       <para>
       This implementation is generally found in arch/*/kernel/kgdb.c.
       As an example, arch/x86/kernel/kgdb.c contains the specifics to
       implement HW breakpoint as well as the initialization to
       dynamically register and unregister for the trap handlers on
-      this architecture.  The arch specific portion implements:
+      this architecture.  The arch-specific portion implements:
       <itemizedlist>
-      <listitem><para>contains an arch specific trap catcher which
+      <listitem><para>contains an arch-specific trap catcher which
       invokes kgdb_handle_exception() to start kgdb about doing its
       work</para></listitem>
       <listitem><para>translation to and from gdb specific packet format to pt_regs</para></listitem>
@@ -347,11 +693,35 @@
       </itemizedlist>
       </para>
       </listitem>
+      <listitem><para>gdbstub frontend (aka kgdb)</para>
+      <para>The gdbstub is located in kernel/debug/gdbstub.c. It contains:</para>
+      <itemizedlist>
+        <listitem><para>All the logic to implement the gdb serial protocol</para></listitem>
+      </itemizedlist>
+      </listitem>
+      <listitem><para>kdb frontend</para>
+      <para>The kdb debugger shell is broken down into a number of
+      components.  The kdb core is located in kernel/debug/kdb.  There
+      are a number of helper functions in some of the other kernel
+      components to make it possible for kdb to examine and report
+      information about the kernel without taking locks that could
+      cause a kernel deadlock.  The kdb core contains implements the following functionality.</para>
+      <itemizedlist>
+        <listitem><para>A simple shell</para></listitem>
+        <listitem><para>The kdb core command set</para></listitem>
+        <listitem><para>A registration API to register additional kdb shell commands.</para>
+        <para>A good example of a self-contained kdb module is the "ftdump" command for dumping the ftrace buffer.  See: kernel/trace/trace_kdb.c</para></listitem>
+        <listitem><para>The implementation for kdb_printf() which
+        emits messages directly to I/O drivers, bypassing the kernel
+        log.</para></listitem>
+        <listitem><para>SW / HW breakpoint management for the kdb shell</para></listitem>
+      </itemizedlist>
+      </listitem>
       <listitem><para>kgdb I/O driver</para>
       <para>
-      Each kgdb I/O driver has to provide an implemenation for the following:
+      Each kgdb I/O driver has to provide an implementation for the following:
       <itemizedlist>
-      <listitem><para>configuration via builtin or module</para></listitem>
+      <listitem><para>configuration via built-in or module</para></listitem>
       <listitem><para>dynamic configuration and kgdb hook registration calls</para></listitem>
       <listitem><para>read and write character interface</para></listitem>
       <listitem><para>A cleanup handler for unconfiguring from the kgdb core</para></listitem>
@@ -411,20 +781,19 @@
   </sect1>
   <sect1 id="kgdbocDesign">
   <title>kgdboc internals</title>
+  <sect2>
+  <title>kgdboc and uarts</title>
   <para>
   The kgdboc driver is actually a very thin driver that relies on the
   underlying low level to the hardware driver having "polling hooks"
   which the to which the tty driver is attached.  In the initial
   implementation of kgdboc it the serial_core was changed to expose a
-  low level uart hook for doing polled mode reading and writing of a
+  low level UART hook for doing polled mode reading and writing of a
   single character while in an atomic context.  When kgdb makes an I/O
-  request to the debugger, kgdboc invokes a call back in the serial
-  core which in turn uses the call back in the uart driver.  It is
-  certainly possible to extend kgdboc to work with non-uart based
-  consoles in the future.
-  </para>
+  request to the debugger, kgdboc invokes a callback in the serial
+  core which in turn uses the callback in the UART driver.</para>
   <para>
-  When using kgdboc with a uart, the uart driver must implement two callbacks in the <constant>struct uart_ops</constant>. Example from drivers/8250.c:<programlisting>
+  When using kgdboc with a UART, the UART driver must implement two callbacks in the <constant>struct uart_ops</constant>. Example from drivers/8250.c:<programlisting>
 #ifdef CONFIG_CONSOLE_POLL
 	.poll_get_char = serial8250_get_poll_char,
 	.poll_put_char = serial8250_put_poll_char,
@@ -434,11 +803,70 @@
   <constant>#ifdef CONFIG_CONSOLE_POLL</constant>, as shown above.
   Keep in mind that polling hooks have to be implemented in such a way
   that they can be called from an atomic context and have to restore
-  the state of the uart chip on return such that the system can return
+  the state of the UART chip on return such that the system can return
   to normal when the debugger detaches.  You need to be very careful
-  with any kind of lock you consider, because failing here is most
+  with any kind of lock you consider, because failing here is most likely
   going to mean pressing the reset button.
   </para>
+  </sect2>
+  <sect2 id="kgdbocKbd">
+  <title>kgdboc and keyboards</title>
+  <para>The kgdboc driver contains logic to configure communications
+  with an attached keyboard.  The keyboard infrastructure is only
+  compiled into the kernel when CONFIG_KDB_KEYBOARD=y is set in the
+  kernel configuration.</para>
+  <para>The core polled keyboard driver driver for PS/2 type keyboards
+  is in drivers/char/kdb_keyboard.c.  This driver is hooked into the
+  debug core when kgdboc populates the callback in the array
+  called <constant>kdb_poll_funcs[]</constant>.  The
+  kdb_get_kbd_char() is the top-level function which polls hardware
+  for single character input.
+  </para>
+  </sect2>
+  <sect2 id="kgdbocKms">
+  <title>kgdboc and kms</title>
+  <para>The kgdboc driver contains logic to request the graphics
+  display to switch to a text context when you are using
+  "kgdboc=kms,kbd", provided that you have a video driver which has a
+  frame buffer console and atomic kernel mode setting support.</para>
+  <para>
+  Every time the kernel
+  debugger is entered it calls kgdboc_pre_exp_handler() which in turn
+  calls con_debug_enter() in the virtual console layer.  On resuming kernel
+  execution, the kernel debugger calls kgdboc_post_exp_handler() which
+  in turn calls con_debug_leave().</para>
+  <para>Any video driver that wants to be compatible with the kernel
+  debugger and the atomic kms callbacks must implement the
+  mode_set_base_atomic, fb_debug_enter and fb_debug_leave operations.
+  For the fb_debug_enter and fb_debug_leave the option exists to use
+  the generic drm fb helper functions or implement something custom for
+  the hardware.  The following example shows the initialization of the
+  .mode_set_base_atomic operation in
+  drivers/gpu/drm/i915/intel_display.c:
+  <informalexample>
+  <programlisting>
+static const struct drm_crtc_helper_funcs intel_helper_funcs = {
+[...]
+        .mode_set_base_atomic = intel_pipe_set_base_atomic,
+[...]
+};
+  </programlisting>
+  </informalexample>
+  </para>
+  <para>Here is an example of how the i915 driver initializes the fb_debug_enter and fb_debug_leave functions to use the generic drm helpers in
+  drivers/gpu/drm/i915/intel_fb.c:
+  <informalexample>
+  <programlisting>
+static struct fb_ops intelfb_ops = {
+[...]
+       .fb_debug_enter = drm_fb_helper_debug_enter,
+       .fb_debug_leave = drm_fb_helper_debug_leave,
+[...]
+};
+  </programlisting>
+  </informalexample>
+  </para>
+  </sect2>
   </sect1>
   </chapter>
   <chapter id="credits">
@@ -453,6 +881,10 @@
 		<itemizedlist>
 		<listitem><para>Jason Wessel<email>jason.wessel@windriver.com</email></para></listitem>
 		</itemizedlist>
+                In Jan 2010 this document was updated to include kdb.
+		<itemizedlist>
+		<listitem><para>Jason Wessel<email>jason.wessel@windriver.com</email></para></listitem>
+		</itemizedlist>
 	</para>
   </chapter>
 </book>

Documentation/DocBook/libata.tmpl

@@ -81,16 +81,14 @@ void (*port_disable) (struct ata_port *);
 	</programlisting>
 
 	<para>
-	Called from ata_bus_probe() and ata_bus_reset() error paths,
-	as well as when unregistering from the SCSI module (rmmod, hot
-	unplug).
+	Called from ata_bus_probe() error path, as well as when
+	unregistering from the SCSI module (rmmod, hot unplug).
 	This function should do whatever needs to be done to take the
 	port out of use.  In most cases, ata_port_disable() can be used
 	as this hook.
 	</para>
 	<para>
 	Called from ata_bus_probe() on a failed probe.
-	Called from ata_bus_reset() on a failed bus reset.
 	Called from ata_scsi_release().
 	</para>
 
@@ -107,10 +105,6 @@ void (*dev_config) (struct ata_port *, struct ata_device *);
 	issue of SET FEATURES - XFER MODE, and prior to operation.
 	</para>
 	<para>
-	Called by ata_device_add() after ata_dev_identify() determines
-	a device is present.
-	</para>
-	<para>
 	This entry may be specified as NULL in ata_port_operations.
 	</para>
 
@@ -154,8 +148,8 @@ unsigned int (*mode_filter) (struct ata_port *, struct ata_device *, unsigned in
 
 	<sect2><title>Taskfile read/write</title>
 	<programlisting>
-void (*tf_load) (struct ata_port *ap, struct ata_taskfile *tf);
-void (*tf_read) (struct ata_port *ap, struct ata_taskfile *tf);
+void (*sff_tf_load) (struct ata_port *ap, struct ata_taskfile *tf);
+void (*sff_tf_read) (struct ata_port *ap, struct ata_taskfile *tf);
 	</programlisting>
 
 	<para>
@@ -164,36 +158,35 @@ void (*tf_read) (struct ata_port *ap, struct ata_taskfile *tf);
 	hardware registers / DMA buffers, to obtain the current set of
 	taskfile register values.
 	Most drivers for taskfile-based hardware (PIO or MMIO) use
-	ata_tf_load() and ata_tf_read() for these hooks.
+	ata_sff_tf_load() and ata_sff_tf_read() for these hooks.
 	</para>
 
 	</sect2>
 
 	<sect2><title>PIO data read/write</title>
 	<programlisting>
-void (*data_xfer) (struct ata_device *, unsigned char *, unsigned int, int);
+void (*sff_data_xfer) (struct ata_device *, unsigned char *, unsigned int, int);
 	</programlisting>
 
 	<para>
 All bmdma-style drivers must implement this hook.  This is the low-level
 operation that actually copies the data bytes during a PIO data
 transfer.
-Typically the driver
-will choose one of ata_pio_data_xfer_noirq(), ata_pio_data_xfer(), or
-ata_mmio_data_xfer().
+Typically the driver will choose one of ata_sff_data_xfer_noirq(),
+ata_sff_data_xfer(), or ata_sff_data_xfer32().
 	</para>
 
 	</sect2>
 
 	<sect2><title>ATA command execute</title>
 	<programlisting>
-void (*exec_command)(struct ata_port *ap, struct ata_taskfile *tf);
+void (*sff_exec_command)(struct ata_port *ap, struct ata_taskfile *tf);
 	</programlisting>
 
 	<para>
 	causes an ATA command, previously loaded with
 	->tf_load(), to be initiated in hardware.
-	Most drivers for taskfile-based hardware use ata_exec_command()
+	Most drivers for taskfile-based hardware use ata_sff_exec_command()
 	for this hook.
 	</para>
 
@@ -218,8 +211,8 @@ command.
 
 	<sect2><title>Read specific ATA shadow registers</title>
 	<programlisting>
-u8   (*check_status)(struct ata_port *ap);
-u8   (*check_altstatus)(struct ata_port *ap);
+u8   (*sff_check_status)(struct ata_port *ap);
+u8   (*sff_check_altstatus)(struct ata_port *ap);
 	</programlisting>
 
 	<para>
@@ -227,20 +220,26 @@ u8   (*check_altstatus)(struct ata_port *ap);
 	hardware.  On some hardware, reading the Status register has
 	the side effect of clearing the interrupt condition.
 	Most drivers for taskfile-based hardware use
-	ata_check_status() for this hook.
+	ata_sff_check_status() for this hook.
 	</para>
+
+	</sect2>
+
+	<sect2><title>Write specific ATA shadow register</title>
+	<programlisting>
+void (*sff_set_devctl)(struct ata_port *ap, u8 ctl);
+	</programlisting>
+
 	<para>
-	Note that because this is called from ata_device_add(), at
-	least a dummy function that clears device interrupts must be
-	provided for all drivers, even if the controller doesn't
-	actually have a taskfile status register.
+	Write the device control ATA shadow register to the hardware.
+	Most drivers don't need to define this.
 	</para>
 
 	</sect2>
 
 	<sect2><title>Select ATA device on bus</title>
 	<programlisting>
-void (*dev_select)(struct ata_port *ap, unsigned int device);
+void (*sff_dev_select)(struct ata_port *ap, unsigned int device);
 	</programlisting>
 
 	<para>
@@ -251,9 +250,7 @@ void (*dev_select)(struct ata_port *ap, unsigned int device);
 	</para>
 	<para>
 	Most drivers for taskfile-based hardware use
-	ata_std_dev_select() for this hook.  Controllers which do not
-	support second drives on a port (such as SATA contollers) will
-	use ata_noop_dev_select().
+	ata_sff_dev_select() for this hook.
 	</para>
 
 	</sect2>
@@ -441,13 +438,13 @@ void (*irq_clear) (struct ata_port *);
 	to struct ata_host_set.
 	</para>
 	<para>
-	Most legacy IDE drivers use ata_interrupt() for the
+	Most legacy IDE drivers use ata_sff_interrupt() for the
 	irq_handler hook, which scans all ports in the host_set,
 	determines which queued command was active (if any), and calls
-	ata_host_intr(ap,qc).
+	ata_sff_host_intr(ap,qc).
 	</para>
 	<para>
-	Most legacy IDE drivers use ata_bmdma_irq_clear() for the
+	Most legacy IDE drivers use ata_sff_irq_clear() for the
 	irq_clear() hook, which simply clears the interrupt and error
 	flags in the DMA status register.
 	</para>
@@ -490,16 +487,12 @@ void (*host_stop) (struct ata_host_set *host_set);
 	allocates space for a legacy IDE PRD table and returns.
 	</para>
 	<para>
-	->port_stop() is called after ->host_stop().  It's sole function
+	->port_stop() is called after ->host_stop().  Its sole function
 	is to release DMA/memory resources, now that they are no longer
 	actively being used.  Many drivers also free driver-private
 	data from port at this time.
 	</para>
 	<para>
-	Many drivers use ata_port_stop() as this hook, which frees the
-	PRD table.
-	</para>
-	<para>
 	->host_stop() is called after all ->port_stop() calls
 have completed.  The hook must finalize hardware shutdown, release DMA
 and other resources, etc.

Documentation/DocBook/mac80211.tmpl

@@ -144,7 +144,7 @@ usage should require reading the full document.
         this though and the recommendation to allow only a single
         interface in STA mode at first!
       </para>
-!Finclude/net/mac80211.h ieee80211_if_init_conf
+!Finclude/net/mac80211.h ieee80211_vif
     </chapter>
 
     <chapter id="rx-tx">
@@ -234,7 +234,6 @@ usage should require reading the full document.
       <title>Multiple queues and QoS support</title>
       <para>TBD</para>
 !Finclude/net/mac80211.h ieee80211_tx_queue_params
-!Finclude/net/mac80211.h ieee80211_tx_queue_stats
     </chapter>
 
     <chapter id="AP">

Documentation/DocBook/media-entities.tmpl

@@ -17,6 +17,7 @@
 <!ENTITY VIDIOC-DBG-G-REGISTER "<link linkend='vidioc-dbg-g-register'><constant>VIDIOC_DBG_G_REGISTER</constant></link>">
 <!ENTITY VIDIOC-DBG-S-REGISTER "<link linkend='vidioc-dbg-g-register'><constant>VIDIOC_DBG_S_REGISTER</constant></link>">
 <!ENTITY VIDIOC-DQBUF "<link linkend='vidioc-qbuf'><constant>VIDIOC_DQBUF</constant></link>">
+<!ENTITY VIDIOC-DQEVENT "<link linkend='vidioc-dqevent'><constant>VIDIOC_DQEVENT</constant></link>">
 <!ENTITY VIDIOC-ENCODER-CMD "<link linkend='vidioc-encoder-cmd'><constant>VIDIOC_ENCODER_CMD</constant></link>">
 <!ENTITY VIDIOC-ENUMAUDIO "<link linkend='vidioc-enumaudio'><constant>VIDIOC_ENUMAUDIO</constant></link>">
 <!ENTITY VIDIOC-ENUMAUDOUT "<link linkend='vidioc-enumaudioout'><constant>VIDIOC_ENUMAUDOUT</constant></link>">
@@ -60,6 +61,7 @@
 <!ENTITY VIDIOC-REQBUFS "<link linkend='vidioc-reqbufs'><constant>VIDIOC_REQBUFS</constant></link>">
 <!ENTITY VIDIOC-STREAMOFF "<link linkend='vidioc-streamon'><constant>VIDIOC_STREAMOFF</constant></link>">
 <!ENTITY VIDIOC-STREAMON "<link linkend='vidioc-streamon'><constant>VIDIOC_STREAMON</constant></link>">
+<!ENTITY VIDIOC-SUBSCRIBE-EVENT "<link linkend='vidioc-subscribe-event'><constant>VIDIOC_SUBSCRIBE_EVENT</constant></link>">
 <!ENTITY VIDIOC-S-AUDIO "<link linkend='vidioc-g-audio'><constant>VIDIOC_S_AUDIO</constant></link>">
 <!ENTITY VIDIOC-S-AUDOUT "<link linkend='vidioc-g-audioout'><constant>VIDIOC_S_AUDOUT</constant></link>">
 <!ENTITY VIDIOC-S-CROP "<link linkend='vidioc-g-crop'><constant>VIDIOC_S_CROP</constant></link>">
@@ -83,6 +85,7 @@
 <!ENTITY VIDIOC-TRY-ENCODER-CMD "<link linkend='vidioc-encoder-cmd'><constant>VIDIOC_TRY_ENCODER_CMD</constant></link>">
 <!ENTITY VIDIOC-TRY-EXT-CTRLS "<link linkend='vidioc-g-ext-ctrls'><constant>VIDIOC_TRY_EXT_CTRLS</constant></link>">
 <!ENTITY VIDIOC-TRY-FMT "<link linkend='vidioc-g-fmt'><constant>VIDIOC_TRY_FMT</constant></link>">
+<!ENTITY VIDIOC-UNSUBSCRIBE-EVENT "<link linkend='vidioc-subscribe-event'><constant>VIDIOC_UNSUBSCRIBE_EVENT</constant></link>">
 
 <!-- Types -->
 <!ENTITY v4l2-std-id "<link linkend='v4l2-std-id'>v4l2_std_id</link>">
@@ -141,6 +144,9 @@
 <!ENTITY v4l2-enc-idx "struct&nbsp;<link linkend='v4l2-enc-idx'>v4l2_enc_idx</link>">
 <!ENTITY v4l2-enc-idx-entry "struct&nbsp;<link linkend='v4l2-enc-idx-entry'>v4l2_enc_idx_entry</link>">
 <!ENTITY v4l2-encoder-cmd "struct&nbsp;<link linkend='v4l2-encoder-cmd'>v4l2_encoder_cmd</link>">
+<!ENTITY v4l2-event "struct&nbsp;<link linkend='v4l2-event'>v4l2_event</link>">
+<!ENTITY v4l2-event-subscription "struct&nbsp;<link linkend='v4l2-event-subscription'>v4l2_event_subscription</link>">
+<!ENTITY v4l2-event-vsync "struct&nbsp;<link linkend='v4l2-event-vsync'>v4l2_event_vsync</link>">
 <!ENTITY v4l2-ext-control "struct&nbsp;<link linkend='v4l2-ext-control'>v4l2_ext_control</link>">
 <!ENTITY v4l2-ext-controls "struct&nbsp;<link linkend='v4l2-ext-controls'>v4l2_ext_controls</link>">
 <!ENTITY v4l2-fmtdesc "struct&nbsp;<link linkend='v4l2-fmtdesc'>v4l2_fmtdesc</link>">
@@ -200,6 +206,7 @@
 <!ENTITY sub-controls SYSTEM "v4l/controls.xml">
 <!ENTITY sub-dev-capture SYSTEM "v4l/dev-capture.xml">
 <!ENTITY sub-dev-codec SYSTEM "v4l/dev-codec.xml">
+<!ENTITY sub-dev-event SYSTEM "v4l/dev-event.xml">
 <!ENTITY sub-dev-effect SYSTEM "v4l/dev-effect.xml">
 <!ENTITY sub-dev-osd SYSTEM "v4l/dev-osd.xml">
 <!ENTITY sub-dev-output SYSTEM "v4l/dev-output.xml">
@@ -211,6 +218,7 @@
 <!ENTITY sub-dev-teletext SYSTEM "v4l/dev-teletext.xml">
 <!ENTITY sub-driver SYSTEM "v4l/driver.xml">
 <!ENTITY sub-libv4l SYSTEM "v4l/libv4l.xml">
+<!ENTITY sub-lirc_device_interface SYSTEM "v4l/lirc_device_interface.xml">
 <!ENTITY sub-remote_controllers SYSTEM "v4l/remote_controllers.xml">
 <!ENTITY sub-fdl-appendix SYSTEM "v4l/fdl-appendix.xml">
 <!ENTITY sub-close SYSTEM "v4l/func-close.xml">
@@ -292,6 +300,8 @@
 <!ENTITY sub-v4l2grab-c SYSTEM "v4l/v4l2grab.c.xml">
 <!ENTITY sub-videodev2-h SYSTEM "v4l/videodev2.h.xml">
 <!ENTITY sub-v4l2 SYSTEM "v4l/v4l2.xml">
+<!ENTITY sub-dqevent SYSTEM "v4l/vidioc-dqevent.xml">
+<!ENTITY sub-subscribe-event SYSTEM "v4l/vidioc-subscribe-event.xml">
 <!ENTITY sub-intro SYSTEM "dvb/intro.xml">
 <!ENTITY sub-frontend SYSTEM "dvb/frontend.xml">
 <!ENTITY sub-dvbproperty SYSTEM "dvb/dvbproperty.xml">
@@ -381,3 +391,5 @@
 <!ENTITY reqbufs SYSTEM "v4l/vidioc-reqbufs.xml">
 <!ENTITY s-hw-freq-seek SYSTEM "v4l/vidioc-s-hw-freq-seek.xml">
 <!ENTITY streamon SYSTEM "v4l/vidioc-streamon.xml">
+<!ENTITY dqevent SYSTEM "v4l/vidioc-dqevent.xml">
+<!ENTITY subscribe_event SYSTEM "v4l/vidioc-subscribe-event.xml">

Documentation/DocBook/media.tmpl

@@ -28,7 +28,7 @@
 <title>LINUX MEDIA INFRASTRUCTURE API</title>
 
 <copyright>
-	<year>2009</year>
+	<year>2009-2010</year>
 	<holder>LinuxTV Developers</holder>
 </copyright>
 
@@ -61,7 +61,7 @@ Foundation. A copy of the license is included in the chapter entitled
 		in fact it covers several different video standards including
 		DVB-T, DVB-S, DVB-C and ATSC. The API is currently being updated
 		to documment support also for DVB-S2, ISDB-T and ISDB-S.</para>
-	<para>The third part covers other API's used by all media infrastructure devices</para>
+	<para>The third part covers Remote Controller API</para>
 	<para>For additional information and for the latest development code,
 		see: <ulink url="http://linuxtv.org">http://linuxtv.org</ulink>.</para>
 	<para>For discussing improvements, reporting troubles, sending new drivers, etc, please mail to: <ulink url="http://vger.kernel.org/vger-lists.html#linux-media">Linux Media Mailing List (LMML).</ulink>.</para>
@@ -86,7 +86,7 @@ Foundation. A copy of the license is included in the chapter entitled
 </author>
 </authorgroup>
 <copyright>
-	<year>2009</year>
+	<year>2009-2010</year>
 	<holder>Mauro Carvalho Chehab</holder>
 </copyright>
 
@@ -101,7 +101,7 @@ Foundation. A copy of the license is included in the chapter entitled
 </revhistory>
 </partinfo>
 
-<title>Other API's used by media infrastructure drivers</title>
+<title>Remote Controller API</title>
 <chapter id="remote_controllers">
 &sub-remote_controllers;
 </chapter>

Documentation/DocBook/mtdnand.tmpl

@@ -269,7 +269,7 @@ static void board_hwcontrol(struct mtd_info *mtd, int cmd)
 			information about the device.
 		</para>
 		<programlisting>
-int __init board_init (void)
+static int __init board_init (void)
 {
 	struct nand_chip *this;
 	int err = 0;
@@ -488,7 +488,7 @@ static void board_select_chip (struct mtd_info *mtd, int chip)
 				The ECC bytes must be placed immidiately after the data
 				bytes in order to make the syndrome generator work. This
 				is contrary to the usual layout used by software ECC. The
-				seperation of data and out of band area is not longer
+				separation of data and out of band area is not longer
 				possible. The nand driver code handles this layout and
 				the remaining free bytes in the oob area are managed by 
 				the autoplacement code. Provide a matching oob-layout
@@ -560,7 +560,7 @@ static void board_select_chip (struct mtd_info *mtd, int chip)
 				bad blocks. They have factory marked good blocks. The marker pattern
 				is erased when the block is erased to be reused. So in case of
 				powerloss before writing the pattern back to the chip this block 
-				would be lost and added to the bad blocks. Therefor we scan the 
+				would be lost and added to the bad blocks. Therefore we scan the 
 				chip(s) when we detect them the first time for good blocks and 
 				store this information in a bad block table before erasing any 
 				of the blocks.
@@ -1094,7 +1094,7 @@ in this page</entry>
 		manufacturers specifications. This applies similar to the spare area. 
 	</para>
 	<para>
-		Therefor NAND aware filesystems must either write in page size chunks
+		Therefore NAND aware filesystems must either write in page size chunks
 		or hold a writebuffer to collect smaller writes until they sum up to 
 		pagesize. Available NAND aware filesystems: JFFS2, YAFFS. 		
 	</para>

Documentation/DocBook/scsi.tmpl

@@ -393,7 +393,7 @@
         </para>
         <para>
           For documentation see
-          <ulink url='http://www.torque.net/sg/sdebug26.html'>http://www.torque.net/sg/sdebug26.html</ulink>
+          <ulink url='http://sg.danny.cz/sg/sdebug26.html'>http://sg.danny.cz/sg/sdebug26.html</ulink>
         </para>
 <!-- !Edrivers/scsi/scsi_debug.c -->
       </sect2>

Documentation/DocBook/sh.tmpl

@@ -19,13 +19,17 @@
   </authorgroup>
 
   <copyright>
-   <year>2008</year>
+   <year>2008-2010</year>
    <holder>Paul Mundt</holder>
   </copyright>
   <copyright>
-   <year>2008</year>
+   <year>2008-2010</year>
    <holder>Renesas Technology Corp.</holder>
   </copyright>
+  <copyright>
+   <year>2010</year>
+   <holder>Renesas Electronics Corp.</holder>
+  </copyright>
 
   <legalnotice>
    <para>
@@ -77,7 +81,7 @@
   </chapter>
   <chapter id="clk">
     <title>Clock Framework Extensions</title>
-!Iarch/sh/include/asm/clock.h
+!Iinclude/linux/sh_clk.h
   </chapter>
   <chapter id="mach">
     <title>Machine Specific Interfaces</title>

Documentation/DocBook/stylesheet.xsl

@@ -6,4 +6,5 @@
 <param name="callout.graphics">0</param>
 <!-- <param name="paper.type">A4</param> -->
 <param name="generate.section.toc.level">2</param>
+<param name="use.id.as.filename">1</param>
 </stylesheet>

Documentation/DocBook/tracepoint.tmpl

@@ -16,6 +16,15 @@
      </address>
     </affiliation>
    </author>
+   <author>
+    <firstname>William</firstname>
+    <surname>Cohen</surname>
+    <affiliation>
+     <address>
+      <email>wcohen@redhat.com</email>
+     </address>
+    </affiliation>
+   </author>
   </authorgroup>
 
   <legalnotice>
@@ -91,4 +100,13 @@
 !Iinclude/trace/events/signal.h
   </chapter>
 
+  <chapter id="block">
+   <title>Block IO</title>
+!Iinclude/trace/events/block.h
+  </chapter>
+
+  <chapter id="workqueue">
+   <title>Workqueue</title>
+!Iinclude/trace/events/workqueue.h
+  </chapter>
 </book>

Documentation/DocBook/v4l/common.xml

@@ -1170,7 +1170,7 @@ frames per second. If less than this number of frames is to be
 captured or output, applications can request frame skipping or
 duplicating on the driver side. This is especially useful when using
 the &func-read; or &func-write;, which are not augmented by timestamps
-or sequence counters, and to avoid unneccessary data copying.</para>
+or sequence counters, and to avoid unnecessary data copying.</para>
 
     <para>Finally these ioctls can be used to determine the number of
 buffers used internally by a driver in read/write mode. For

Documentation/DocBook/v4l/compat.xml

@@ -1091,8 +1091,9 @@ signed 64-bit integer. Output devices should not send a buffer out
 until the time in the timestamp field has arrived. I would like to
 follow SGI's lead, and adopt a multimedia timestamping system like
 their UST (Unadjusted System Time). See
-http://reality.sgi.com/cpirazzi_engr/lg/time/intro.html. [This link is
-no longer valid.] UST uses timestamps that are 64-bit signed integers
+http://web.archive.org/web/*/http://reality.sgi.com
+/cpirazzi_engr/lg/time/intro.html. 
+UST uses timestamps that are 64-bit signed integers
 (not struct timeval's) and given in nanosecond units. The UST clock
 starts at zero when the system is booted and runs continuously and
 uniformly. It takes a little over 292 years for UST to overflow. There
@@ -2332,15 +2333,26 @@ more information.</para>
 	</listitem>
       </orderedlist>
     </section>
-   </section>
+    <section>
+      <title>V4L2 in Linux 2.6.34</title>
+      <orderedlist>
+	<listitem>
+	  <para>Added
+<constant>V4L2_CID_IRIS_ABSOLUTE</constant> and
+<constant>V4L2_CID_IRIS_RELATIVE</constant> controls to the
+	    <link linkend="camera-controls">Camera controls class</link>.
+	  </para>
+	</listitem>
+      </orderedlist>
+    </section>
 
-   <section id="other">
-     <title>Relation of V4L2 to other Linux multimedia APIs</title>
+    <section id="other">
+      <title>Relation of V4L2 to other Linux multimedia APIs</title>
 
-    <section id="xvideo">
-      <title>X Video Extension</title>
+      <section id="xvideo">
+        <title>X Video Extension</title>
 
-      <para>The X Video Extension (abbreviated XVideo or just Xv) is
+        <para>The X Video Extension (abbreviated XVideo or just Xv) is
 an extension of the X Window system, implemented for example by the
 XFree86 project. Its scope is similar to V4L2, an API to video capture
 and output devices for X clients. Xv allows applications to display
@@ -2351,7 +2363,7 @@ capture or output still images in XPixmaps<footnote>
 extension available across many operating systems and
 architectures.</para>
 
-      <para>Because the driver is embedded into the X server Xv has a
+        <para>Because the driver is embedded into the X server Xv has a
 number of advantages over the V4L2 <link linkend="overlay">video
 overlay interface</link>. The driver can easily determine the overlay
 target, &ie; visible graphics memory or off-screen buffers for a
@@ -2360,16 +2372,16 @@ overlay, scaling or color-keying, or the clipping functions of the
 video capture hardware, always in sync with drawing operations or
 windows moving or changing their stacking order.</para>
 
-      <para>To combine the advantages of Xv and V4L a special Xv
+        <para>To combine the advantages of Xv and V4L a special Xv
 driver exists in XFree86 and XOrg, just programming any overlay capable
 Video4Linux device it finds. To enable it
 <filename>/etc/X11/XF86Config</filename> must contain these lines:</para>
-      <para><screen>
+        <para><screen>
 Section "Module"
     Load "v4l"
 EndSection</screen></para>
 
-      <para>As of XFree86 4.2 this driver still supports only V4L
+        <para>As of XFree86 4.2 this driver still supports only V4L
 ioctls, however it should work just fine with all V4L2 devices through
 the V4L2 backward-compatibility layer. Since V4L2 permits multiple
 opens it is possible (if supported by the V4L2 driver) to capture
@@ -2377,83 +2389,84 @@ video while an X client requested video overlay. Restrictions of
 simultaneous capturing and overlay are discussed in <xref
 	  linkend="overlay" /> apply.</para>
 
-      <para>Only marginally related to V4L2, XFree86 extended Xv to
+        <para>Only marginally related to V4L2, XFree86 extended Xv to
 support hardware YUV to RGB conversion and scaling for faster video
 playback, and added an interface to MPEG-2 decoding hardware. This API
 is useful to display images captured with V4L2 devices.</para>
-    </section>
+      </section>
 
-    <section>
-      <title>Digital Video</title>
+      <section>
+        <title>Digital Video</title>
 
-      <para>V4L2 does not support digital terrestrial, cable or
+        <para>V4L2 does not support digital terrestrial, cable or
 satellite broadcast. A separate project aiming at digital receivers
 exists. You can find its homepage at <ulink
 url="http://linuxtv.org">http://linuxtv.org</ulink>. The Linux DVB API
 has no connection to the V4L2 API except that drivers for hybrid
 hardware may support both.</para>
-    </section>
+      </section>
 
-    <section>
-      <title>Audio Interfaces</title>
+      <section>
+        <title>Audio Interfaces</title>
 
-      <para>[to do - OSS/ALSA]</para>
+        <para>[to do - OSS/ALSA]</para>
+      </section>
     </section>
-  </section>
 
-  <section id="experimental">
-    <title>Experimental API Elements</title>
+    <section id="experimental">
+      <title>Experimental API Elements</title>
 
-    <para>The following V4L2 API elements are currently experimental
+      <para>The following V4L2 API elements are currently experimental
 and may change in the future.</para>
 
-    <itemizedlist>
-      <listitem>
-	<para>Video Output Overlay (OSD) Interface, <xref
+      <itemizedlist>
+        <listitem>
+	  <para>Video Output Overlay (OSD) Interface, <xref
 	    linkend="osd" />.</para>
-      </listitem>
+        </listitem>
 	<listitem>
-	<para><constant>V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY</constant>,
+	  <para><constant>V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY</constant>,
 	&v4l2-buf-type;, <xref linkend="v4l2-buf-type" />.</para>
-      </listitem>
-      <listitem>
-	<para><constant>V4L2_CAP_VIDEO_OUTPUT_OVERLAY</constant>,
+        </listitem>
+        <listitem>
+	  <para><constant>V4L2_CAP_VIDEO_OUTPUT_OVERLAY</constant>,
 &VIDIOC-QUERYCAP; ioctl, <xref linkend="device-capabilities" />.</para>
-      </listitem>
-      <listitem>
-	<para>&VIDIOC-ENUM-FRAMESIZES; and
+        </listitem>
+        <listitem>
+	  <para>&VIDIOC-ENUM-FRAMESIZES; and
 &VIDIOC-ENUM-FRAMEINTERVALS; ioctls.</para>
-      </listitem>
-      <listitem>
-	<para>&VIDIOC-G-ENC-INDEX; ioctl.</para>
-      </listitem>
-      <listitem>
-	<para>&VIDIOC-ENCODER-CMD; and &VIDIOC-TRY-ENCODER-CMD;
+        </listitem>
+        <listitem>
+	  <para>&VIDIOC-G-ENC-INDEX; ioctl.</para>
+        </listitem>
+        <listitem>
+	  <para>&VIDIOC-ENCODER-CMD; and &VIDIOC-TRY-ENCODER-CMD;
 ioctls.</para>
-      </listitem>
-      <listitem>
-	<para>&VIDIOC-DBG-G-REGISTER; and &VIDIOC-DBG-S-REGISTER;
+        </listitem>
+        <listitem>
+	  <para>&VIDIOC-DBG-G-REGISTER; and &VIDIOC-DBG-S-REGISTER;
 ioctls.</para>
-      </listitem>
-      <listitem>
-	<para>&VIDIOC-DBG-G-CHIP-IDENT; ioctl.</para>
-      </listitem>
-    </itemizedlist>
-  </section>
+        </listitem>
+        <listitem>
+	  <para>&VIDIOC-DBG-G-CHIP-IDENT; ioctl.</para>
+        </listitem>
+      </itemizedlist>
+    </section>
 
-  <section id="obsolete">
-    <title>Obsolete API Elements</title>
+    <section id="obsolete">
+      <title>Obsolete API Elements</title>
 
-    <para>The following V4L2 API elements were superseded by new
+      <para>The following V4L2 API elements were superseded by new
 interfaces and should not be implemented in new drivers.</para>
 
-    <itemizedlist>
-      <listitem>
-	<para><constant>VIDIOC_G_MPEGCOMP</constant> and
+      <itemizedlist>
+        <listitem>
+	  <para><constant>VIDIOC_G_MPEGCOMP</constant> and
 <constant>VIDIOC_S_MPEGCOMP</constant> ioctls. Use Extended Controls,
 <xref linkend="extended-controls" />.</para>
-      </listitem>
-    </itemizedlist>
+        </listitem>
+      </itemizedlist>
+    </section>
   </section>
 
   <!--

Documentation/DocBook/v4l/controls.xml

@@ -266,6 +266,12 @@ minimum value disables backlight compensation.</entry>
 	    <entry>boolean</entry>
 	    <entry>Chroma automatic gain control.</entry>
 	  </row>
+	  <row>
+	    <entry><constant>V4L2_CID_CHROMA_GAIN</constant></entry>
+	    <entry>integer</entry>
+	    <entry>Adjusts the Chroma gain control (for use when chroma AGC
+	    is disabled).</entry>
+	  </row>
 	  <row>
 	    <entry><constant>V4L2_CID_COLOR_KILLER</constant></entry>
 	    <entry>boolean</entry>
@@ -277,8 +283,15 @@ minimum value disables backlight compensation.</entry>
 	    <entry>Selects a color effect. Possible values for
 <constant>enum v4l2_colorfx</constant> are:
 <constant>V4L2_COLORFX_NONE</constant> (0),
-<constant>V4L2_COLORFX_BW</constant> (1) and
-<constant>V4L2_COLORFX_SEPIA</constant> (2).</entry>
+<constant>V4L2_COLORFX_BW</constant> (1),
+<constant>V4L2_COLORFX_SEPIA</constant> (2),
+<constant>V4L2_COLORFX_NEGATIVE</constant> (3),
+<constant>V4L2_COLORFX_EMBOSS</constant> (4),
+<constant>V4L2_COLORFX_SKETCH</constant> (5),
+<constant>V4L2_COLORFX_SKY_BLUE</constant> (6),
+<constant>V4L2_COLORFX_GRASS_GREEN</constant> (7),
+<constant>V4L2_COLORFX_SKIN_WHITEN</constant> (8) and
+<constant>V4L2_COLORFX_VIVID</constant> (9).</entry>
 	  </row>
 	  <row>
 	    <entry><constant>V4L2_CID_ROTATE</constant></entry>
@@ -1824,6 +1837,25 @@ wide-angle direction. The zoom speed unit is driver-specific.</entry>
 	  </row>
 	  <row><entry></entry></row>
 
+	  <row>
+	    <entry spanname="id"><constant>V4L2_CID_IRIS_ABSOLUTE</constant>&nbsp;</entry>
+	    <entry>integer</entry>
+	  </row><row><entry spanname="descr">This control sets the
+camera's aperture to the specified value. The unit is undefined.
+Larger values open the iris wider, smaller values close it.</entry>
+	  </row>
+	  <row><entry></entry></row>
+
+	  <row>
+	    <entry spanname="id"><constant>V4L2_CID_IRIS_RELATIVE</constant>&nbsp;</entry>
+	    <entry>integer</entry>
+	  </row><row><entry spanname="descr">This control modifies the
+camera's aperture by the specified amount. The unit is undefined.
+Positive values open the iris one step further, negative values close
+it one step further. This is a write-only control.</entry>
+	  </row>
+	  <row><entry></entry></row>
+
 	  <row>
 	    <entry spanname="id"><constant>V4L2_CID_PRIVACY</constant>&nbsp;</entry>
 	    <entry>boolean</entry>

Documentation/DocBook/v4l/dev-event.xml

@@ -0,0 +1,31 @@
+  <title>Event Interface</title>
+
+  <para>The V4L2 event interface provides means for user to get
+  immediately notified on certain conditions taking place on a device.
+  This might include start of frame or loss of signal events, for
+  example.
+  </para>
+
+  <para>To receive events, the events the user is interested in first must
+  be subscribed using the &VIDIOC-SUBSCRIBE-EVENT; ioctl. Once an event is
+  subscribed, the events of subscribed types are dequeueable using the
+  &VIDIOC-DQEVENT; ioctl. Events may be unsubscribed using
+  VIDIOC_UNSUBSCRIBE_EVENT ioctl. The special event type V4L2_EVENT_ALL may
+  be used to unsubscribe all the events the driver supports.</para>
+
+  <para>The event subscriptions and event queues are specific to file
+  handles. Subscribing an event on one file handle does not affect
+  other file handles.
+  </para>
+
+  <para>The information on dequeueable events is obtained by using select or
+  poll system calls on video devices. The V4L2 events use POLLPRI events on
+  poll system call and exceptions on select system call.  </para>
+
+  <!--
+Local Variables:
+mode: sgml
+sgml-parent-document: "v4l2.sgml"
+indent-tabs-mode: nil
+End:
+  -->

Documentation/DocBook/v4l/fdl-appendix.xml

@@ -2,7 +2,7 @@
      The GNU Free Documentation License 1.1 in DocBook
      Markup by Eric Baudais <baudais@okstate.edu>
      Maintained by the GNOME Documentation Project
-     http://developer.gnome.org/projects/gdp
+     http://live.gnome.org/DocumentationProject
      Version: 1.0.1
      Last Modified: Nov 16, 2000
 -->

Documentation/DocBook/v4l/io.xml

@@ -589,7 +589,8 @@ number of a video input as in &v4l2-input; field
 	    <entry></entry>
 	    <entry>A place holder for future extensions and custom
 (driver defined) buffer types
-<constant>V4L2_BUF_TYPE_PRIVATE</constant> and higher.</entry>
+<constant>V4L2_BUF_TYPE_PRIVATE</constant> and higher. Applications
+should set this to 0.</entry>
 	  </row>
 	</tbody>
       </tgroup>
@@ -700,6 +701,16 @@ buffer cannot be on both queues at the same time, the
 They can be both cleared however, then the buffer is in "dequeued"
 state, in the application domain to say so.</entry>
 	  </row>
+	  <row>
+	    <entry><constant>V4L2_BUF_FLAG_ERROR</constant></entry>
+	    <entry>0x0040</entry>
+	    <entry>When this flag is set, the buffer has been dequeued
+	    successfully, although the data might have been corrupted.
+	    This is recoverable, streaming may continue as normal and
+	    the buffer may be reused normally.
+	    Drivers set this flag when the <constant>VIDIOC_DQBUF</constant>
+	    ioctl is called.</entry>
+	  </row>
 	  <row>
 	    <entry><constant>V4L2_BUF_FLAG_KEYFRAME</constant></entry>
 	    <entry>0x0008</entry>
@@ -917,8 +928,8 @@ order</emphasis>.</para>
 
     <para>When the driver provides or accepts images field by field
 rather than interleaved, it is also important applications understand
-how the fields combine to frames. We distinguish between top and
-bottom fields, the <emphasis>spatial order</emphasis>: The first line
+how the fields combine to frames. We distinguish between top (aka odd) and
+bottom (aka even) fields, the <emphasis>spatial order</emphasis>: The first line
 of the top field is the first line of an interlaced frame, the first
 line of the bottom field is the second line of that frame.</para>
 
@@ -971,12 +982,12 @@ between <constant>V4L2_FIELD_TOP</constant> and
 	  <row>
 	    <entry><constant>V4L2_FIELD_TOP</constant></entry>
 	    <entry>2</entry>
-	    <entry>Images consist of the top field only.</entry>
+	    <entry>Images consist of the top (aka odd) field only.</entry>
 	  </row>
 	  <row>
 	    <entry><constant>V4L2_FIELD_BOTTOM</constant></entry>
 	    <entry>3</entry>
-	    <entry>Images consist of the bottom field only.
+	    <entry>Images consist of the bottom (aka even) field only.
 Applications may wish to prevent a device from capturing interlaced
 images because they will have "comb" or "feathering" artefacts around
 moving objects.</entry>

Documentation/DocBook/v4l/lirc_device_interface.xml

@@ -0,0 +1,251 @@
+<section id="lirc_dev">
+<title>LIRC Device Interface</title>
+
+
+<section id="lirc_dev_intro">
+<title>Introduction</title>
+
+<para>The LIRC device interface is a bi-directional interface for
+transporting raw IR data between userspace and kernelspace. Fundamentally,
+it is just a chardev (/dev/lircX, for X = 0, 1, 2, ...), with a number
+of standard struct file_operations defined on it. With respect to
+transporting raw IR data to and fro, the essential fops are read, write
+and ioctl.</para>
+
+<para>Example dmesg output upon a driver registering w/LIRC:</para>
+  <blockquote>
+    <para>$ dmesg |grep lirc_dev</para>
+    <para>lirc_dev: IR Remote Control driver registered, major 248</para>
+    <para>rc rc0: lirc_dev: driver ir-lirc-codec (mceusb) registered at minor = 0</para>
+  </blockquote>
+
+<para>What you should see for a chardev:</para>
+  <blockquote>
+    <para>$ ls -l /dev/lirc*</para>
+    <para>crw-rw---- 1 root root 248, 0 Jul  2 22:20 /dev/lirc0</para>
+  </blockquote>
+</section>
+
+<section id="lirc_read">
+<title>LIRC read fop</title>
+
+<para>The lircd userspace daemon reads raw IR data from the LIRC chardev. The
+exact format of the data depends on what modes a driver supports, and what
+mode has been selected. lircd obtains supported modes and sets the active mode
+via the ioctl interface, detailed at <xref linkend="lirc_ioctl"/>. The generally
+preferred mode is LIRC_MODE_MODE2, in which packets containing an int value
+describing an IR signal are read from the chardev.</para>
+
+<para>See also <ulink url="http://www.lirc.org/html/technical.html">http://www.lirc.org/html/technical.html</ulink> for more info.</para>
+</section>
+
+<section id="lirc_write">
+<title>LIRC write fop</title>
+
+<para>The data written to the chardev is a pulse/space sequence of integer
+values. Pulses and spaces are only marked implicitly by their position. The
+data must start and end with a pulse, therefore, the data must always include
+an unevent number of samples. The write function must block until the data has
+been transmitted by the hardware.</para>
+</section>
+
+<section id="lirc_ioctl">
+<title>LIRC ioctl fop</title>
+
+<para>The LIRC device's ioctl definition is bound by the ioctl function
+definition of struct file_operations, leaving us with an unsigned int
+for the ioctl command and an unsigned long for the arg. For the purposes
+of ioctl portability across 32-bit and 64-bit, these values are capped
+to their 32-bit sizes.</para>
+
+<para>The following ioctls can be used to change specific hardware settings.
+In general each driver should have a default set of settings. The driver
+implementation is expected to re-apply the default settings when the device
+is closed by user-space, so that every application opening the device can rely
+on working with the default settings initially.</para>
+
+<variablelist>
+  <varlistentry>
+    <term>LIRC_GET_FEATURES</term>
+    <listitem>
+      <para>Obviously, get the underlying hardware device's features. If a driver
+      does not announce support of certain features, calling of the corresponding
+      ioctls is undefined.</para>
+    </listitem>
+  </varlistentry>
+  <varlistentry>
+    <term>LIRC_GET_SEND_MODE</term>
+    <listitem>
+      <para>Get supported transmit mode. Only LIRC_MODE_PULSE is supported by lircd.</para>
+    </listitem>
+  </varlistentry>
+  <varlistentry>
+    <term>LIRC_GET_REC_MODE</term>
+    <listitem>
+      <para>Get supported receive modes. Only LIRC_MODE_MODE2 and LIRC_MODE_LIRCCODE
+      are supported by lircd.</para>
+    </listitem>
+  </varlistentry>
+  <varlistentry>
+    <term>LIRC_GET_SEND_CARRIER</term>
+    <listitem>
+      <para>Get carrier frequency (in Hz) currently used for transmit.</para>
+    </listitem>
+  </varlistentry>
+  <varlistentry>
+    <term>LIRC_GET_REC_CARRIER</term>
+    <listitem>
+      <para>Get carrier frequency (in Hz) currently used for IR reception.</para>
+    </listitem>
+  </varlistentry>
+  <varlistentry>
+    <term>LIRC_{G,S}ET_{SEND,REC}_DUTY_CYCLE</term>
+    <listitem>
+      <para>Get/set the duty cycle (from 0 to 100) of the carrier signal. Currently,
+      no special meaning is defined for 0 or 100, but this could be used to switch
+      off carrier generation in the future, so these values should be reserved.</para>
+    </listitem>
+  </varlistentry>
+  <varlistentry>
+    <term>LIRC_GET_REC_RESOLUTION</term>
+    <listitem>
+      <para>Some receiver have maximum resolution which is defined by internal
+      sample rate or data format limitations. E.g. it's common that signals can
+      only be reported in 50 microsecond steps. This integer value is used by
+      lircd to automatically adjust the aeps tolerance value in the lircd
+      config file.</para>
+    </listitem>
+  </varlistentry>
+  <varlistentry>
+    <term>LIRC_GET_M{IN,AX}_TIMEOUT</term>
+    <listitem>
+      <para>Some devices have internal timers that can be used to detect when
+      there's no IR activity for a long time. This can help lircd in detecting
+      that a IR signal is finished and can speed up the decoding process.
+      Returns an integer value with the minimum/maximum timeout that can be
+      set. Some devices have a fixed timeout, in that case both ioctls will
+      return the same value even though the timeout cannot be changed.</para>
+    </listitem>
+  </varlistentry>
+  <varlistentry>
+    <term>LIRC_GET_M{IN,AX}_FILTER_{PULSE,SPACE}</term>
+    <listitem>
+      <para>Some devices are able to filter out spikes in the incoming signal
+      using given filter rules. These ioctls return the hardware capabilities
+      that describe the bounds of the possible filters. Filter settings depend
+      on the IR protocols that are expected. lircd derives the settings from
+      all protocols definitions found in its config file.</para>
+    </listitem>
+  </varlistentry>
+  <varlistentry>
+    <term>LIRC_GET_LENGTH</term>
+    <listitem>
+      <para>Retrieves the code length in bits (only for LIRC_MODE_LIRCCODE).
+      Reads on the device must be done in blocks matching the bit count.
+      The bit could should be rounded up so that it matches full bytes.</para>
+    </listitem>
+  </varlistentry>
+  <varlistentry>
+    <term>LIRC_SET_{SEND,REC}_MODE</term>
+    <listitem>
+      <para>Set send/receive mode. Largely obsolete for send, as only
+      LIRC_MODE_PULSE is supported.</para>
+    </listitem>
+  </varlistentry>
+  <varlistentry>
+    <term>LIRC_SET_{SEND,REC}_CARRIER</term>
+    <listitem>
+      <para>Set send/receive carrier (in Hz).</para>
+    </listitem>
+  </varlistentry>
+  <varlistentry>
+    <term>LIRC_SET_TRANSMITTER_MASK</term>
+    <listitem>
+      <para>This enables the given set of transmitters. The first transmitter
+      is encoded by the least significant bit, etc. When an invalid bit mask
+      is given, i.e. a bit is set, even though the device does not have so many
+      transitters, then this ioctl returns the number of available transitters
+      and does nothing otherwise.</para>
+    </listitem>
+  </varlistentry>
+  <varlistentry>
+    <term>LIRC_SET_REC_TIMEOUT</term>
+    <listitem>
+      <para>Sets the integer value for IR inactivity timeout (cf.
+      LIRC_GET_MIN_TIMEOUT and LIRC_GET_MAX_TIMEOUT). A value of 0 (if
+      supported by the hardware) disables all hardware timeouts and data should
+      be reported as soon as possible. If the exact value cannot be set, then
+      the next possible value _greater_ than the given value should be set.</para>
+    </listitem>
+  </varlistentry>
+  <varlistentry>
+    <term>LIRC_SET_REC_TIMEOUT_REPORTS</term>
+    <listitem>
+      <para>Enable (1) or disable (0) timeout reports in LIRC_MODE_MODE2. By
+      default, timeout reports should be turned off.</para>
+    </listitem>
+  </varlistentry>
+  <varlistentry>
+    <term>LIRC_SET_REC_FILTER_{,PULSE,SPACE}</term>
+    <listitem>
+      <para>Pulses/spaces shorter than this are filtered out by hardware. If
+      filters cannot be set independently for pulse/space, the corresponding
+      ioctls must return an error and LIRC_SET_REC_FILTER shall be used instead.</para>
+    </listitem>
+  </varlistentry>
+  <varlistentry>
+    <term>LIRC_SET_MEASURE_CARRIER_MODE</term>
+    <listitem>
+      <para>Enable (1)/disable (0) measure mode. If enabled, from the next key
+      press on, the driver will send LIRC_MODE2_FREQUENCY packets. By default
+      this should be turned off.</para>
+    </listitem>
+  </varlistentry>
+  <varlistentry>
+    <term>LIRC_SET_REC_{DUTY_CYCLE,CARRIER}_RANGE</term>
+    <listitem>
+      <para>To set a range use LIRC_SET_REC_DUTY_CYCLE_RANGE/LIRC_SET_REC_CARRIER_RANGE
+      with the lower bound first and later LIRC_SET_REC_DUTY_CYCLE/LIRC_SET_REC_CARRIER
+      with the upper bound.</para>
+    </listitem>
+  </varlistentry>
+  <varlistentry>
+    <term>LIRC_NOTIFY_DECODE</term>
+    <listitem>
+      <para>This ioctl is called by lircd whenever a successful decoding of an
+      incoming IR signal could be done. This can be used by supporting hardware
+      to give visual feedback to the user e.g. by flashing a LED.</para>
+    </listitem>
+  </varlistentry>
+  <varlistentry>
+    <term>LIRC_SETUP_{START,END}</term>
+    <listitem>
+      <para>Setting of several driver parameters can be optimized by encapsulating
+      the according ioctl calls with LIRC_SETUP_START/LIRC_SETUP_END. When a
+      driver receives a LIRC_SETUP_START ioctl it can choose to not commit
+      further setting changes to the hardware until a LIRC_SETUP_END is received.
+      But this is open to the driver implementation and every driver must also
+      handle parameter changes which are not encapsulated by LIRC_SETUP_START
+      and LIRC_SETUP_END. Drivers can also choose to ignore these ioctls.</para>
+    </listitem>
+  </varlistentry>
+  <varlistentry>
+    <term>LIRC_SET_WIDEBAND_RECEIVER</term>
+    <listitem>
+      <para>Some receivers are equipped with special wide band receiver which is intended
+      to be used to learn output of existing remote.
+      Calling that ioctl with (1) will enable it, and with (0) disable it.
+      This might be useful of receivers that have otherwise narrow band receiver
+      that prevents them to be used with some remotes.
+      Wide band receiver might also be more precise
+      On the other hand its disadvantage it usually reduced range of reception.
+      Note: wide band receiver might be implictly enabled if you enable
+      carrier reports. In that case it will be disabled as soon as you disable
+      carrier reports. Trying to disable wide band receiver while carrier
+      reports are active will do nothing.</para>
+    </listitem>
+  </varlistentry>
+</variablelist>
+
+</section>
+</section>

Documentation/DocBook/v4l/pixfmt-packed-rgb.xml

@@ -240,6 +240,45 @@ colorspace <constant>V4L2_COLORSPACE_SRGB</constant>.</para>
 	    <entry>r<subscript>1</subscript></entry>
 	    <entry>r<subscript>0</subscript></entry>
 	  </row>
+	  <row id="V4L2-PIX-FMT-BGR666">
+	    <entry><constant>V4L2_PIX_FMT_BGR666</constant></entry>
+	    <entry>'BGRH'</entry>
+	    <entry></entry>
+	    <entry>b<subscript>5</subscript></entry>
+	    <entry>b<subscript>4</subscript></entry>
+	    <entry>b<subscript>3</subscript></entry>
+	    <entry>b<subscript>2</subscript></entry>
+	    <entry>b<subscript>1</subscript></entry>
+	    <entry>b<subscript>0</subscript></entry>
+	    <entry>g<subscript>5</subscript></entry>
+	    <entry>g<subscript>4</subscript></entry>
+	    <entry></entry>
+	    <entry>g<subscript>3</subscript></entry>
+	    <entry>g<subscript>2</subscript></entry>
+	    <entry>g<subscript>1</subscript></entry>
+	    <entry>g<subscript>0</subscript></entry>
+	    <entry>r<subscript>5</subscript></entry>
+	    <entry>r<subscript>4</subscript></entry>
+	    <entry>r<subscript>3</subscript></entry>
+	    <entry>r<subscript>2</subscript></entry>
+	    <entry></entry>
+	    <entry>r<subscript>1</subscript></entry>
+	    <entry>r<subscript>0</subscript></entry>
+	    <entry></entry>
+	    <entry></entry>
+	    <entry></entry>
+	    <entry></entry>
+	    <entry></entry>
+	    <entry></entry>
+	    <entry></entry>
+	    <entry></entry>
+	    <entry></entry>
+	    <entry></entry>
+	    <entry></entry>
+	    <entry></entry>
+	    <entry></entry>
+	    <entry></entry>
+	  </row>
 	  <row id="V4L2-PIX-FMT-BGR24">
 	    <entry><constant>V4L2_PIX_FMT_BGR24</constant></entry>
 	    <entry>'BGR3'</entry>
@@ -700,6 +739,45 @@ defined in error. Drivers may interpret them as in <xref
 	    <entry>b<subscript>1</subscript></entry>
 	    <entry>b<subscript>0</subscript></entry>
 	  </row>
+	  <row id="V4L2-PIX-FMT-BGR666">
+	    <entry><constant>V4L2_PIX_FMT_BGR666</constant></entry>
+	    <entry>'BGRH'</entry>
+	    <entry></entry>
+	    <entry>b<subscript>5</subscript></entry>
+	    <entry>b<subscript>4</subscript></entry>
+	    <entry>b<subscript>3</subscript></entry>
+	    <entry>b<subscript>2</subscript></entry>
+	    <entry>b<subscript>1</subscript></entry>
+	    <entry>b<subscript>0</subscript></entry>
+	    <entry>g<subscript>5</subscript></entry>
+	    <entry>g<subscript>4</subscript></entry>
+	    <entry></entry>
+	    <entry>g<subscript>3</subscript></entry>
+	    <entry>g<subscript>2</subscript></entry>
+	    <entry>g<subscript>1</subscript></entry>
+	    <entry>g<subscript>0</subscript></entry>
+	    <entry>r<subscript>5</subscript></entry>
+	    <entry>r<subscript>4</subscript></entry>
+	    <entry>r<subscript>3</subscript></entry>
+	    <entry>r<subscript>2</subscript></entry>
+	    <entry></entry>
+	    <entry>r<subscript>1</subscript></entry>
+	    <entry>r<subscript>0</subscript></entry>
+	    <entry></entry>
+	    <entry></entry>
+	    <entry></entry>
+	    <entry></entry>
+	    <entry></entry>
+	    <entry></entry>
+	    <entry></entry>
+	    <entry></entry>
+	    <entry></entry>
+	    <entry></entry>
+	    <entry></entry>
+	    <entry></entry>
+	    <entry></entry>
+	    <entry></entry>
+	  </row>
 	  <row><!-- id="V4L2-PIX-FMT-BGR24" -->
 	    <entry><constant>V4L2_PIX_FMT_BGR24</constant></entry>
 	    <entry>'BGR3'</entry>

Documentation/DocBook/v4l/pixfmt.xml

@@ -792,6 +792,18 @@ http://www.thedirks.org/winnov/</ulink></para></entry>
 	    <entry>'YYUV'</entry>
 	    <entry>unknown</entry>
 	  </row>
+	  <row id="V4L2-PIX-FMT-Y4">
+	    <entry><constant>V4L2_PIX_FMT_Y4</constant></entry>
+	    <entry>'Y04 '</entry>
+	    <entry>Old 4-bit greyscale format. Only the least significant 4 bits of each byte are used,
+the other bits are set to 0.</entry>
+	  </row>
+	  <row id="V4L2-PIX-FMT-Y6">
+	    <entry><constant>V4L2_PIX_FMT_Y6</constant></entry>
+	    <entry>'Y06 '</entry>
+	    <entry>Old 6-bit greyscale format. Only the least significant 6 bits of each byte are used,
+the other bits are set to 0.</entry>
+	  </row>
 	</tbody>
       </tgroup>
     </table>

Documentation/DocBook/v4l/remote_controllers.xml

@@ -173,3 +173,5 @@ keymapping.</para>
 <para>This program demonstrates how to replace the keymap tables.</para>
 &sub-keytable-c;
 </section>
+
+&sub-lirc_device_interface;

Documentation/DocBook/v4l/v4l2.xml

@@ -58,7 +58,7 @@ MPEG stream embedded, sliced VBI data format in this specification.
 </contrib>
 	<affiliation>
 	  <address>
-	    <email>awalls@radix.net</email>
+	    <email>awalls@md.metrocast.net</email>
 	  </address>
 	</affiliation>
       </author>
@@ -401,6 +401,7 @@ and discussions on the V4L mailing list.</revremark>
     <section id="ttx"> &sub-dev-teletext; </section>
     <section id="radio"> &sub-dev-radio; </section>
     <section id="rds"> &sub-dev-rds; </section>
+    <section id="event"> &sub-dev-event; </section>
   </chapter>
 
   <chapter id="driver">
@@ -426,6 +427,7 @@ and discussions on the V4L mailing list.</revremark>
     &sub-cropcap;
     &sub-dbg-g-chip-ident;
     &sub-dbg-g-register;
+    &sub-dqevent;
     &sub-encoder-cmd;
     &sub-enumaudio;
     &sub-enumaudioout;
@@ -467,6 +469,7 @@ and discussions on the V4L mailing list.</revremark>
     &sub-reqbufs;
     &sub-s-hw-freq-seek;
     &sub-streamon;
+    &sub-subscribe-event;
     <!-- End of ioctls. -->
     &sub-mmap;
     &sub-munmap;

Documentation/DocBook/v4l/videodev2.h.xml

@@ -1018,6 +1018,13 @@ enum <link linkend="v4l2-colorfx">v4l2_colorfx</link> {
         V4L2_COLORFX_NONE       = 0,
         V4L2_COLORFX_BW         = 1,
         V4L2_COLORFX_SEPIA      = 2,
+        V4L2_COLORFX_NEGATIVE   = 3,
+        V4L2_COLORFX_EMBOSS     = 4,
+        V4L2_COLORFX_SKETCH     = 5,
+        V4L2_COLORFX_SKY_BLUE   = 6,
+        V4L2_COLORFX_GRASS_GREEN = 7,
+        V4L2_COLORFX_SKIN_WHITEN = 8,
+        V4L2_COLORFX_VIVID      = 9.
 };
 #define V4L2_CID_AUTOBRIGHTNESS                 (V4L2_CID_BASE+32)
 #define V4L2_CID_BAND_STOP_FILTER               (V4L2_CID_BASE+33)
@@ -1271,6 +1278,9 @@ enum  <link linkend="v4l2-exposure-auto-type">v4l2_exposure_auto_type</link> {
 
 #define V4L2_CID_PRIVACY                        (V4L2_CID_CAMERA_CLASS_BASE+16)
 
+#define V4L2_CID_IRIS_ABSOLUTE                  (V4L2_CID_CAMERA_CLASS_BASE+17)
+#define V4L2_CID_IRIS_RELATIVE                  (V4L2_CID_CAMERA_CLASS_BASE+18)
+
 /* FM Modulator class control IDs */
 #define V4L2_CID_FM_TX_CLASS_BASE               (V4L2_CTRL_CLASS_FM_TX | 0x900)
 #define V4L2_CID_FM_TX_CLASS                    (V4L2_CTRL_CLASS_FM_TX | 1)

Documentation/DocBook/v4l/vidioc-dqevent.xml

@@ -0,0 +1,131 @@
+<refentry id="vidioc-dqevent">
+  <refmeta>
+    <refentrytitle>ioctl VIDIOC_DQEVENT</refentrytitle>
+    &manvol;
+  </refmeta>
+
+  <refnamediv>
+    <refname>VIDIOC_DQEVENT</refname>
+    <refpurpose>Dequeue event</refpurpose>
+  </refnamediv>
+
+  <refsynopsisdiv>
+    <funcsynopsis>
+      <funcprototype>
+	<funcdef>int <function>ioctl</function></funcdef>
+	<paramdef>int <parameter>fd</parameter></paramdef>
+	<paramdef>int <parameter>request</parameter></paramdef>
+	<paramdef>struct v4l2_event
+*<parameter>argp</parameter></paramdef>
+      </funcprototype>
+    </funcsynopsis>
+  </refsynopsisdiv>
+
+  <refsect1>
+    <title>Arguments</title>
+
+    <variablelist>
+      <varlistentry>
+	<term><parameter>fd</parameter></term>
+	<listitem>
+	  <para>&fd;</para>
+	</listitem>
+      </varlistentry>
+      <varlistentry>
+	<term><parameter>request</parameter></term>
+	<listitem>
+	  <para>VIDIOC_DQEVENT</para>
+	</listitem>
+      </varlistentry>
+      <varlistentry>
+	<term><parameter>argp</parameter></term>
+	<listitem>
+	  <para></para>
+	</listitem>
+      </varlistentry>
+    </variablelist>
+  </refsect1>
+
+  <refsect1>
+    <title>Description</title>
+
+    <para>Dequeue an event from a video device. No input is required
+    for this ioctl. All the fields of the &v4l2-event; structure are
+    filled by the driver. The file handle will also receive exceptions
+    which the application may get by e.g. using the select system
+    call.</para>
+
+    <table frame="none" pgwide="1" id="v4l2-event">
+      <title>struct <structname>v4l2_event</structname></title>
+      <tgroup cols="4">
+	&cs-str;
+	<tbody valign="top">
+	  <row>
+	    <entry>__u32</entry>
+	    <entry><structfield>type</structfield></entry>
+            <entry></entry>
+	    <entry>Type of the event.</entry>
+	  </row>
+	  <row>
+	    <entry>union</entry>
+	    <entry><structfield>u</structfield></entry>
+            <entry></entry>
+	    <entry></entry>
+	  </row>
+	  <row>
+	    <entry></entry>
+	    <entry>&v4l2-event-vsync;</entry>
+            <entry><structfield>vsync</structfield></entry>
+	    <entry>Event data for event V4L2_EVENT_VSYNC.
+            </entry>
+	  </row>
+	  <row>
+	    <entry></entry>
+	    <entry>__u8</entry>
+            <entry><structfield>data</structfield>[64]</entry>
+	    <entry>Event data. Defined by the event type. The union
+            should be used to define easily accessible type for
+            events.</entry>
+	  </row>
+	  <row>
+	    <entry>__u32</entry>
+	    <entry><structfield>pending</structfield></entry>
+            <entry></entry>
+	    <entry>Number of pending events excluding this one.</entry>
+	  </row>
+	  <row>
+	    <entry>__u32</entry>
+	    <entry><structfield>sequence</structfield></entry>
+            <entry></entry>
+	    <entry>Event sequence number. The sequence number is
+	    incremented for every subscribed event that takes place.
+	    If sequence numbers are not contiguous it means that
+	    events have been lost.
+	    </entry>
+	  </row>
+	  <row>
+	    <entry>struct timespec</entry>
+	    <entry><structfield>timestamp</structfield></entry>
+            <entry></entry>
+	    <entry>Event timestamp.</entry>
+	  </row>
+	  <row>
+	    <entry>__u32</entry>
+	    <entry><structfield>reserved</structfield>[9]</entry>
+            <entry></entry>
+	    <entry>Reserved for future extensions. Drivers must set
+	    the array to zero.</entry>
+	  </row>
+	</tbody>
+      </tgroup>
+    </table>
+
+  </refsect1>
+</refentry>
+<!--
+Local Variables:
+mode: sgml
+sgml-parent-document: "v4l2.sgml"
+indent-tabs-mode: nil
+End:
+-->

Documentation/DocBook/v4l/vidioc-enuminput.xml

@@ -283,7 +283,7 @@ input/output interface to linux-media@vger.kernel.org on 19 Oct 2009.
 	    <entry>This input supports setting DV presets by using VIDIOC_S_DV_PRESET.</entry>
 	  </row>
 	  <row>
-	    <entry><constant>V4L2_OUT_CAP_CUSTOM_TIMINGS</constant></entry>
+	    <entry><constant>V4L2_IN_CAP_CUSTOM_TIMINGS</constant></entry>
 	    <entry>0x00000002</entry>
 	    <entry>This input supports setting custom video timings by using VIDIOC_S_DV_TIMINGS.</entry>
 	  </row>

Documentation/DocBook/v4l/vidioc-g-parm.xml

@@ -55,7 +55,7 @@ captured or output, applications can request frame skipping or
 duplicating on the driver side. This is especially useful when using
 the <function>read()</function> or <function>write()</function>, which
 are not augmented by timestamps or sequence counters, and to avoid
-unneccessary data copying.</para>
+unnecessary data copying.</para>
 
     <para>Further these ioctls can be used to determine the number of
 buffers used internally by a driver in read/write mode. For

Documentation/DocBook/v4l/vidioc-qbuf.xml

@@ -54,12 +54,10 @@ to enqueue an empty (capturing) or filled (output) buffer in the
 driver's incoming queue. The semantics depend on the selected I/O
 method.</para>
 
-    <para>To enqueue a <link linkend="mmap">memory mapped</link>
-buffer applications set the <structfield>type</structfield> field of a
-&v4l2-buffer; to the same buffer type as previously &v4l2-format;
-<structfield>type</structfield> and &v4l2-requestbuffers;
-<structfield>type</structfield>, the <structfield>memory</structfield>
-field to <constant>V4L2_MEMORY_MMAP</constant> and the
+    <para>To enqueue a buffer applications set the <structfield>type</structfield>
+field of a &v4l2-buffer; to the same buffer type as was previously used
+with &v4l2-format; <structfield>type</structfield> and &v4l2-requestbuffers;
+<structfield>type</structfield>. Applications must also set the
 <structfield>index</structfield> field. Valid index numbers range from
 zero to the number of buffers allocated with &VIDIOC-REQBUFS;
 (&v4l2-requestbuffers; <structfield>count</structfield>) minus one. The
@@ -70,8 +68,19 @@ intended for output (<structfield>type</structfield> is
 <constant>V4L2_BUF_TYPE_VBI_OUTPUT</constant>) applications must also
 initialize the <structfield>bytesused</structfield>,
 <structfield>field</structfield> and
-<structfield>timestamp</structfield> fields. See <xref
-	linkend="buffer" /> for details. When
+<structfield>timestamp</structfield> fields, see <xref
+linkend="buffer" /> for details.
+Applications must also set <structfield>flags</structfield> to 0. If a driver
+supports capturing from specific video inputs and you want to specify a video
+input, then <structfield>flags</structfield> should be set to
+<constant>V4L2_BUF_FLAG_INPUT</constant> and the field
+<structfield>input</structfield> must be initialized to the desired input.
+The <structfield>reserved</structfield> field must be set to 0.
+</para>
+
+    <para>To enqueue a <link linkend="mmap">memory mapped</link>
+buffer applications set the <structfield>memory</structfield>
+field to <constant>V4L2_MEMORY_MMAP</constant>. When
 <constant>VIDIOC_QBUF</constant> is called with a pointer to this
 structure the driver sets the
 <constant>V4L2_BUF_FLAG_MAPPED</constant> and
@@ -81,14 +90,10 @@ structure the driver sets the
 &EINVAL;.</para>
 
     <para>To enqueue a <link linkend="userp">user pointer</link>
-buffer applications set the <structfield>type</structfield> field of a
-&v4l2-buffer; to the same buffer type as previously &v4l2-format;
-<structfield>type</structfield> and &v4l2-requestbuffers;
-<structfield>type</structfield>, the <structfield>memory</structfield>
-field to <constant>V4L2_MEMORY_USERPTR</constant> and the
+buffer applications set the <structfield>memory</structfield>
+field to <constant>V4L2_MEMORY_USERPTR</constant>, the
 <structfield>m.userptr</structfield> field to the address of the
-buffer and <structfield>length</structfield> to its size. When the
-buffer is intended for output additional fields must be set as above.
+buffer and <structfield>length</structfield> to its size.
 When <constant>VIDIOC_QBUF</constant> is called with a pointer to this
 structure the driver sets the <constant>V4L2_BUF_FLAG_QUEUED</constant>
 flag and clears the <constant>V4L2_BUF_FLAG_MAPPED</constant> and
@@ -96,16 +101,21 @@ flag and clears the <constant>V4L2_BUF_FLAG_MAPPED</constant> and
 <structfield>flags</structfield> field, or it returns an error code.
 This ioctl locks the memory pages of the buffer in physical memory,
 they cannot be swapped out to disk. Buffers remain locked until
-dequeued, until the &VIDIOC-STREAMOFF; or &VIDIOC-REQBUFS; ioctl are
+dequeued, until the &VIDIOC-STREAMOFF; or &VIDIOC-REQBUFS; ioctl is
 called, or until the device is closed.</para>
 
     <para>Applications call the <constant>VIDIOC_DQBUF</constant>
 ioctl to dequeue a filled (capturing) or displayed (output) buffer
 from the driver's outgoing queue. They just set the
-<structfield>type</structfield> and <structfield>memory</structfield>
+<structfield>type</structfield>, <structfield>memory</structfield>
+and <structfield>reserved</structfield>
 fields of a &v4l2-buffer; as above, when <constant>VIDIOC_DQBUF</constant>
 is called with a pointer to this structure the driver fills the
-remaining fields or returns an error code.</para>
+remaining fields or returns an error code. The driver may also set
+<constant>V4L2_BUF_FLAG_ERROR</constant> in the <structfield>flags</structfield>
+field. It indicates a non-critical (recoverable) streaming error. In such case
+the application may continue as normal, but should be aware that data in the
+dequeued buffer might be corrupted.</para>
 
     <para>By default <constant>VIDIOC_DQBUF</constant> blocks when no
 buffer is in the outgoing queue. When the
@@ -152,7 +162,13 @@ enqueue a user pointer buffer.</para>
 	  <para><constant>VIDIOC_DQBUF</constant> failed due to an
 internal error. Can also indicate temporary problems like signal
 loss. Note the driver might dequeue an (empty) buffer despite
-returning an error, or even stop capturing.</para>
+returning an error, or even stop capturing. Reusing such buffer may be unsafe
+though and its details (e.g. <structfield>index</structfield>) may not be
+returned either. It is recommended that drivers indicate recoverable errors
+by setting the <constant>V4L2_BUF_FLAG_ERROR</constant> and returning 0 instead.
+In that case the application should be able to safely reuse the buffer and
+continue streaming.
+	</para>
 	</listitem>
       </varlistentry>
     </variablelist>

Documentation/DocBook/v4l/vidioc-query-dv-preset.xml

@@ -53,8 +53,10 @@ input</refpurpose>
 automatically, similar to sensing the video standard. To do so, applications
 call <constant> VIDIOC_QUERY_DV_PRESET</constant> with a pointer to a
 &v4l2-dv-preset; type. Once the hardware detects a preset, that preset is
-returned in the preset field of &v4l2-dv-preset;. When detection is not
-possible or fails, the value V4L2_DV_INVALID is returned.</para>
+returned in the preset field of &v4l2-dv-preset;. If the preset could not be
+detected because there was no signal, or the signal was unreliable, or the
+signal did not map to a supported preset, then the value V4L2_DV_INVALID is
+returned.</para>
   </refsect1>
 
   <refsect1>

Documentation/DocBook/v4l/vidioc-querybuf.xml

@@ -54,12 +54,13 @@ buffer at any time after buffers have been allocated with the
 &VIDIOC-REQBUFS; ioctl.</para>
 
     <para>Applications set the <structfield>type</structfield> field
-    of a &v4l2-buffer; to the same buffer type as previously
+    of a &v4l2-buffer; to the same buffer type as was previously used with
 &v4l2-format; <structfield>type</structfield> and &v4l2-requestbuffers;
 <structfield>type</structfield>, and the <structfield>index</structfield>
     field. Valid index numbers range from zero
 to the number of buffers allocated with &VIDIOC-REQBUFS;
     (&v4l2-requestbuffers; <structfield>count</structfield>) minus one.
+The <structfield>reserved</structfield> field should to set to 0.
 After calling <constant>VIDIOC_QUERYBUF</constant> with a pointer to
     this structure drivers return an error code or fill the rest of
 the structure.</para>
@@ -68,8 +69,8 @@ the structure.</para>
 <constant>V4L2_BUF_FLAG_MAPPED</constant>,
 <constant>V4L2_BUF_FLAG_QUEUED</constant> and
 <constant>V4L2_BUF_FLAG_DONE</constant> flags will be valid. The
-<structfield>memory</structfield> field will be set to
-<constant>V4L2_MEMORY_MMAP</constant>, the <structfield>m.offset</structfield>
+<structfield>memory</structfield> field will be set to the current
+I/O method, the <structfield>m.offset</structfield>
 contains the offset of the buffer from the start of the device memory,
 the <structfield>length</structfield> field its size. The driver may
 or may not set the remaining fields and flags, they are meaningless in

Documentation/DocBook/v4l/vidioc-queryctrl.xml

@@ -325,7 +325,7 @@ should be part of the control documentation.</entry>
 	    <entry>n/a</entry>
 	    <entry>This is not a control. When
 <constant>VIDIOC_QUERYCTRL</constant> is called with a control ID
-equal to a control class code (see <xref linkend="ctrl-class" />), the
+equal to a control class code (see <xref linkend="ctrl-class" />) + 1, the
 ioctl returns the name of the control class and this control type.
 Older drivers which do not support this feature return an
 &EINVAL;.</entry>

Documentation/DocBook/v4l/vidioc-reqbufs.xml

@@ -54,23 +54,23 @@ I/O. Memory mapped buffers are located in device memory and must be
 allocated with this ioctl before they can be mapped into the
 application's address space. User buffers are allocated by
 applications themselves, and this ioctl is merely used to switch the
-driver into user pointer I/O mode.</para>
+driver into user pointer I/O mode and to setup some internal structures.</para>
 
-    <para>To allocate device buffers applications initialize three
-fields of a <structname>v4l2_requestbuffers</structname> structure.
+    <para>To allocate device buffers applications initialize all
+fields of the <structname>v4l2_requestbuffers</structname> structure.
 They set the <structfield>type</structfield> field to the respective
 stream or buffer type, the <structfield>count</structfield> field to
-the desired number of buffers, and <structfield>memory</structfield>
-must be set to <constant>V4L2_MEMORY_MMAP</constant>. When the ioctl
-is called with a pointer to this structure the driver attempts to
-allocate the requested number of buffers and stores the actual number
+the desired number of buffers, <structfield>memory</structfield>
+must be set to the requested I/O method and the <structfield>reserved</structfield> array
+must be zeroed. When the ioctl
+is called with a pointer to this structure the driver will attempt to allocate
+the requested number of buffers and it stores the actual number
 allocated in the <structfield>count</structfield> field. It can be
 smaller than the number requested, even zero, when the driver runs out
-of free memory. A larger number is possible when the driver requires
-more buffers to function correctly.<footnote>
-	<para>For example video output requires at least two buffers,
+of free memory. A larger number is also possible when the driver requires
+more buffers to function correctly. For example video output requires at least two buffers,
 one displayed and one filled by the application.</para>
-	</footnote> When memory mapping I/O is not supported the ioctl
+    <para>When the I/O method is not supported the ioctl
 returns an &EINVAL;.</para>
 
     <para>Applications can call <constant>VIDIOC_REQBUFS</constant>
@@ -81,14 +81,6 @@ in progress, an implicit &VIDIOC-STREAMOFF;. <!-- mhs: I see no
 reason why munmap()ping one or even all buffers must imply
 streamoff.--></para>
 
-    <para>To negotiate user pointer I/O, applications initialize only
-the <structfield>type</structfield> field and set
-<structfield>memory</structfield> to
-<constant>V4L2_MEMORY_USERPTR</constant>. When the ioctl is called
-with a pointer to this structure the driver prepares for user pointer
-I/O, when this I/O method is not supported the ioctl returns an
-&EINVAL;.</para>
-
     <table pgwide="1" frame="none" id="v4l2-requestbuffers">
       <title>struct <structname>v4l2_requestbuffers</structname></title>
       <tgroup cols="3">
@@ -97,9 +89,7 @@ I/O, when this I/O method is not supported the ioctl returns an
 	  <row>
 	    <entry>__u32</entry>
 	    <entry><structfield>count</structfield></entry>
-	    <entry>The number of buffers requested or granted. This
-field is only used when <structfield>memory</structfield> is set to
-<constant>V4L2_MEMORY_MMAP</constant>.</entry>
+	    <entry>The number of buffers requested or granted.</entry>
 	  </row>
 	  <row>
 	    <entry>&v4l2-buf-type;</entry>
@@ -120,7 +110,7 @@ as the &v4l2-format; <structfield>type</structfield> field. See <xref
 	    <entry><structfield>reserved</structfield>[2]</entry>
 	    <entry>A place holder for future extensions and custom
 (driver defined) buffer types <constant>V4L2_BUF_TYPE_PRIVATE</constant> and
-higher.</entry>
+higher. This array should be zeroed by applications.</entry>
 	  </row>
 	</tbody>
       </tgroup>

Documentation/DocBook/v4l/vidioc-subscribe-event.xml

@@ -0,0 +1,133 @@
+<refentry id="vidioc-subscribe-event">
+  <refmeta>
+    <refentrytitle>ioctl VIDIOC_SUBSCRIBE_EVENT, VIDIOC_UNSUBSCRIBE_EVENT</refentrytitle>
+    &manvol;
+  </refmeta>
+
+  <refnamediv>
+    <refname>VIDIOC_SUBSCRIBE_EVENT, VIDIOC_UNSUBSCRIBE_EVENT</refname>
+    <refpurpose>Subscribe or unsubscribe event</refpurpose>
+  </refnamediv>
+
+  <refsynopsisdiv>
+    <funcsynopsis>
+      <funcprototype>
+	<funcdef>int <function>ioctl</function></funcdef>
+	<paramdef>int <parameter>fd</parameter></paramdef>
+	<paramdef>int <parameter>request</parameter></paramdef>
+	<paramdef>struct v4l2_event_subscription
+*<parameter>argp</parameter></paramdef>
+      </funcprototype>
+    </funcsynopsis>
+  </refsynopsisdiv>
+
+  <refsect1>
+    <title>Arguments</title>
+
+    <variablelist>
+      <varlistentry>
+	<term><parameter>fd</parameter></term>
+	<listitem>
+	  <para>&fd;</para>
+	</listitem>
+      </varlistentry>
+      <varlistentry>
+	<term><parameter>request</parameter></term>
+	<listitem>
+	  <para>VIDIOC_SUBSCRIBE_EVENT, VIDIOC_UNSUBSCRIBE_EVENT</para>
+	</listitem>
+      </varlistentry>
+      <varlistentry>
+	<term><parameter>argp</parameter></term>
+	<listitem>
+	  <para></para>
+	</listitem>
+      </varlistentry>
+    </variablelist>
+  </refsect1>
+
+  <refsect1>
+    <title>Description</title>
+
+    <para>Subscribe or unsubscribe V4L2 event. Subscribed events are
+    dequeued by using the &VIDIOC-DQEVENT; ioctl.</para>
+
+    <table frame="none" pgwide="1" id="v4l2-event-subscription">
+      <title>struct <structname>v4l2_event_subscription</structname></title>
+      <tgroup cols="3">
+	&cs-str;
+	<tbody valign="top">
+	  <row>
+	    <entry>__u32</entry>
+	    <entry><structfield>type</structfield></entry>
+	    <entry>Type of the event.</entry>
+	  </row>
+	  <row>
+	    <entry>__u32</entry>
+	    <entry><structfield>reserved</structfield>[7]</entry>
+	    <entry>Reserved for future extensions. Drivers and applications
+	    must set the array to zero.</entry>
+	  </row>
+	</tbody>
+      </tgroup>
+    </table>
+
+    <table frame="none" pgwide="1" id="event-type">
+      <title>Event Types</title>
+      <tgroup cols="3">
+	&cs-def;
+	<tbody valign="top">
+	  <row>
+	    <entry><constant>V4L2_EVENT_ALL</constant></entry>
+	    <entry>0</entry>
+	    <entry>All events. V4L2_EVENT_ALL is valid only for
+	    VIDIOC_UNSUBSCRIBE_EVENT for unsubscribing all events at once.
+	    </entry>
+	  </row>
+	  <row>
+	    <entry><constant>V4L2_EVENT_VSYNC</constant></entry>
+	    <entry>1</entry>
+	    <entry>This event is triggered on the vertical sync.
+	    This event has &v4l2-event-vsync; associated with it.
+	    </entry>
+	  </row>
+	  <row>
+	    <entry><constant>V4L2_EVENT_EOS</constant></entry>
+	    <entry>2</entry>
+	    <entry>This event is triggered when the end of a stream is reached.
+	    This is typically used with MPEG decoders to report to the application
+	    when the last of the MPEG stream has been decoded.
+	    </entry>
+	  </row>
+	  <row>
+	    <entry><constant>V4L2_EVENT_PRIVATE_START</constant></entry>
+	    <entry>0x08000000</entry>
+	    <entry>Base event number for driver-private events.</entry>
+	  </row>
+	</tbody>
+      </tgroup>
+    </table>
+
+    <table frame="none" pgwide="1" id="v4l2-event-vsync">
+      <title>struct <structname>v4l2_event_vsync</structname></title>
+      <tgroup cols="3">
+	&cs-str;
+	<tbody valign="top">
+	  <row>
+	    <entry>__u8</entry>
+	    <entry><structfield>field</structfield></entry>
+	    <entry>The upcoming field. See &v4l2-field;.</entry>
+	  </row>
+	</tbody>
+      </tgroup>
+    </table>
+
+  </refsect1>
+</refentry>
+<!--
+Local Variables:
+mode: sgml
+sgml-parent-document: "v4l2.sgml"
+indent-tabs-mode: nil
+End:
+-->

Documentation/DocBook/writing-an-alsa-driver.tmpl

@@ -5518,34 +5518,41 @@ struct _snd_pcm_runtime {
 ]]>
         </programlisting>
       </informalexample>
+
+      For the raw data, <structfield>size</structfield> field must be
+      set properly.  This specifies the maximum size of the proc file access.
     </para>
 
     <para>
-      The callback is much more complicated than the text-file
-      version. You need to use a low-level I/O functions such as
+      The read/write callbacks of raw mode are more direct than the text mode.
+      You need to use a low-level I/O functions such as
       <function>copy_from/to_user()</function> to transfer the
       data.
 
       <informalexample>
         <programlisting>
 <![CDATA[
-  static long my_file_io_read(struct snd_info_entry *entry,
+  static ssize_t my_file_io_read(struct snd_info_entry *entry,
                               void *file_private_data,
                               struct file *file,
                               char *buf,
-                              unsigned long count,
-                              unsigned long pos)
+                              size_t count,
+                              loff_t pos)
   {
-          long size = count;
-          if (pos + size > local_max_size)
-                  size = local_max_size - pos;
-          if (copy_to_user(buf, local_data + pos, size))
+          if (copy_to_user(buf, local_data + pos, count))
                   return -EFAULT;
-          return size;
+          return count;
   }
 ]]>
         </programlisting>
       </informalexample>
+
+      If the size of the info entry has been set up properly,
+      <structfield>count</structfield> and <structfield>pos</structfield> are
+      guaranteed to fit within 0 and the given size.
+      You don't have to check the range in the callbacks unless any
+      other condition is required.
+
     </para>
 
   </chapter>

Documentation/DocBook/writing_usb_driver.tmpl

@@ -342,7 +342,7 @@ static inline void skel_delete (struct usb_skel *dev)
 {
     kfree (dev->bulk_in_buffer);
     if (dev->bulk_out_buffer != NULL)
-        usb_buffer_free (dev->udev, dev->bulk_out_size,
+        usb_free_coherent (dev->udev, dev->bulk_out_size,
             dev->bulk_out_buffer,
             dev->write_urb->transfer_dma);
     usb_free_urb (dev->write_urb);

Documentation/HOWTO

@@ -187,7 +187,7 @@ apply a patch.
 If you do not know where you want to start, but you want to look for
 some task to start doing to join into the kernel development community,
 go to the Linux Kernel Janitor's project:
-	http://janitor.kernelnewbies.org/
+	http://kernelnewbies.org/KernelJanitors	
 It is a great place to start.  It describes a list of relatively simple
 problems that need to be cleaned up and fixed within the Linux kernel
 source tree.  Working with the developers in charge of this project, you
@@ -221,8 +221,8 @@ branches.  These different branches are:
   - main 2.6.x kernel tree
   - 2.6.x.y -stable kernel tree
   - 2.6.x -git kernel patches
-  - 2.6.x -mm kernel patches
   - subsystem specific kernel trees and patches
+  - the 2.6.x -next kernel tree for integration tests
 
 2.6.x kernel tree
 -----------------
@@ -232,9 +232,9 @@ process is as follows:
   - As soon as a new kernel is released a two weeks window is open,
     during this period of time maintainers can submit big diffs to
     Linus, usually the patches that have already been included in the
-    -mm kernel for a few weeks.  The preferred way to submit big changes
+    -next kernel for a few weeks.  The preferred way to submit big changes
     is using git (the kernel's source management tool, more information
-    can be found at http://git.or.cz/) but plain patches are also just
+    can be found at http://git-scm.com/) but plain patches are also just
     fine.
   - After two weeks a -rc1 kernel is released it is now possible to push
     only patches that do not include new features that could affect the
@@ -293,84 +293,43 @@ daily and represent the current state of Linus' tree.  They are more
 experimental than -rc kernels since they are generated automatically
 without even a cursory glance to see if they are sane.
 
-2.6.x -mm kernel patches
-------------------------
-These are experimental kernel patches released by Andrew Morton.  Andrew
-takes all of the different subsystem kernel trees and patches and mushes
-them together, along with a lot of patches that have been plucked from
-the linux-kernel mailing list.  This tree serves as a proving ground for
-new features and patches.  Once a patch has proved its worth in -mm for
-a while Andrew or the subsystem maintainer pushes it on to Linus for
-inclusion in mainline.
-
-It is heavily encouraged that all new patches get tested in the -mm tree
-before they are sent to Linus for inclusion in the main kernel tree.  Code
-which does not make an appearance in -mm before the opening of the merge
-window will prove hard to merge into the mainline.
-
-These kernels are not appropriate for use on systems that are supposed
-to be stable and they are more risky to run than any of the other
-branches.
-
-If you wish to help out with the kernel development process, please test
-and use these kernel releases and provide feedback to the linux-kernel
-mailing list if you have any problems, and if everything works properly.
-
-In addition to all the other experimental patches, these kernels usually
-also contain any changes in the mainline -git kernels available at the
-time of release.
-
-The -mm kernels are not released on a fixed schedule, but usually a few
--mm kernels are released in between each -rc kernel (1 to 3 is common).
-
 Subsystem Specific kernel trees and patches
 -------------------------------------------
-A number of the different kernel subsystem developers expose their
-development trees so that others can see what is happening in the
-different areas of the kernel.  These trees are pulled into the -mm
-kernel releases as described above.
-
-Here is a list of some of the different kernel trees available:
-  git trees:
-    - Kbuild development tree, Sam Ravnborg <sam@ravnborg.org>
-	git.kernel.org:/pub/scm/linux/kernel/git/sam/kbuild.git
-
-    - ACPI development tree, Len Brown <len.brown@intel.com>
-	git.kernel.org:/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6.git
-
-    - Block development tree, Jens Axboe <jens.axboe@oracle.com>
-	git.kernel.org:/pub/scm/linux/kernel/git/axboe/linux-2.6-block.git
-
-    - DRM development tree, Dave Airlie <airlied@linux.ie>
-	git.kernel.org:/pub/scm/linux/kernel/git/airlied/drm-2.6.git
-
-    - ia64 development tree, Tony Luck <tony.luck@intel.com>
-	git.kernel.org:/pub/scm/linux/kernel/git/aegl/linux-2.6.git
-
-    - infiniband, Roland Dreier <rolandd@cisco.com>
-	git.kernel.org:/pub/scm/linux/kernel/git/roland/infiniband.git
-
-    - libata, Jeff Garzik <jgarzik@pobox.com>
-	git.kernel.org:/pub/scm/linux/kernel/git/jgarzik/libata-dev.git
-
-    - network drivers, Jeff Garzik <jgarzik@pobox.com>
-	git.kernel.org:/pub/scm/linux/kernel/git/jgarzik/netdev-2.6.git
-
-    - pcmcia, Dominik Brodowski <linux@dominikbrodowski.net>
-	git.kernel.org:/pub/scm/linux/kernel/git/brodo/pcmcia-2.6.git
-
-    - SCSI, James Bottomley <James.Bottomley@hansenpartnership.com>
-	git.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6.git
-
-    - x86, Ingo Molnar <mingo@elte.hu>
-	git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86.git
-
-  quilt trees:
-    - USB, Driver Core, and I2C, Greg Kroah-Hartman <gregkh@suse.de>
-	kernel.org/pub/linux/kernel/people/gregkh/gregkh-2.6/
+The maintainers of the various kernel subsystems --- and also many
+kernel subsystem developers --- expose their current state of
+development in source repositories.  That way, others can see what is
+happening in the different areas of the kernel.  In areas where
+development is rapid, a developer may be asked to base his submissions
+onto such a subsystem kernel tree so that conflicts between the
+submission and other already ongoing work are avoided.
+
+Most of these repositories are git trees, but there are also other SCMs
+in use, or patch queues being published as quilt series.  Addresses of
+these subsystem repositories are listed in the MAINTAINERS file.  Many
+of them can be browsed at http://git.kernel.org/.
+
+Before a proposed patch is committed to such a subsystem tree, it is
+subject to review which primarily happens on mailing lists (see the
+respective section below).  For several kernel subsystems, this review
+process is tracked with the tool patchwork.  Patchwork offers a web
+interface which shows patch postings, any comments on a patch or
+revisions to it, and maintainers can mark patches as under review,
+accepted, or rejected.  Most of these patchwork sites are listed at
+http://patchwork.kernel.org/.
+
+2.6.x -next kernel tree for integration tests
+---------------------------------------------
+Before updates from subsystem trees are merged into the mainline 2.6.x
+tree, they need to be integration-tested.  For this purpose, a special
+testing repository exists into which virtually all subsystem trees are
+pulled on an almost daily basis:
+	http://git.kernel.org/?p=linux/kernel/git/sfr/linux-next.git
+	http://linux.f-seidel.de/linux-next/pmwiki/
+
+This way, the -next kernel gives a summary outlook onto what will be
+expected to go into the mainline kernel at the next merge period.
+Adventurous testers are very welcome to runtime-test the -next kernel.
 
-  Other kernel trees can be found listed at http://git.kernel.org/ and in
-  the MAINTAINERS file.
 
 Bug Reporting
 -------------
@@ -636,7 +595,7 @@ start exactly where you are now.
 
 ----------
 Thanks to Paolo Ciarrocchi who allowed the "Development Process"
-(http://linux.tar.bz/articles/2.6-development_process) section
+(http://lwn.net/Articles/94386/) section
 to be based on text he had written, and to Randy Dunlap and Gerrit
 Huizenga for some of the list of things you should and should not say.
 Also thanks to Pat Mochel, Hanna Linder, Randy Dunlap, Kay Sievers,

Documentation/IPMI.txt

@@ -365,6 +365,7 @@ You can change this at module load time (for a module) with:
        regshifts=<shift1>,<shift2>,...
        slave_addrs=<addr1>,<addr2>,...
        force_kipmid=<enable1>,<enable2>,...
+       kipmid_max_busy_us=<ustime1>,<ustime2>,...
        unload_when_empty=[0|1]
 
 Each of these except si_trydefaults is a list, the first item for the
@@ -433,6 +434,7 @@ kernel command line as:
        ipmi_si.regshifts=<shift1>,<shift2>,...
        ipmi_si.slave_addrs=<addr1>,<addr2>,...
        ipmi_si.force_kipmid=<enable1>,<enable2>,...
+       ipmi_si.kipmid_max_busy_us=<ustime1>,<ustime2>,...
 
 It works the same as the module parameters of the same names.
 
@@ -450,6 +452,16 @@ force this thread on or off.  If you force it off and don't have
 interrupts, the driver will run VERY slowly.  Don't blame me,
 these interfaces suck.
 
+Unfortunately, this thread can use a lot of CPU depending on the
+interface's performance.  This can waste a lot of CPU and cause
+various issues with detecting idle CPU and using extra power.  To
+avoid this, the kipmid_max_busy_us sets the maximum amount of time, in
+microseconds, that kipmid will spin before sleeping for a tick.  This
+value sets a balance between performance and CPU waste and needs to be
+tuned to your needs.  Maybe, someday, auto-tuning will be added, but
+that's not a simple thing and even the auto-tuning would need to be
+tuned to the user's desired performance.
+
 The driver supports a hot add and remove of interfaces.  This way,
 interfaces can be added or removed after the kernel is up and running.
 This is done using /sys/modules/ipmi_si/parameters/hotmod, which is a

Documentation/Makefile

@@ -1,3 +1,3 @@
 obj-m := DocBook/ accounting/ auxdisplay/ connector/ \
-	filesystems/configfs/ ia64/ networking/ \
-	pcmcia/ spi/ video4linux/ vm/ watchdog/src/
+	filesystems/ filesystems/configfs/ ia64/ laptops/ networking/ \
+	pcmcia/ spi/ timers/ video4linux/ vm/ watchdog/src/

Documentation/PCI/PCI-DMA-mapping.txt

@@ -1,766 +0,0 @@
-			Dynamic DMA mapping
-			===================
-
-		 David S. Miller <davem@redhat.com>
-		 Richard Henderson <rth@cygnus.com>
-		  Jakub Jelinek <jakub@redhat.com>
-
-This document describes the DMA mapping system in terms of the pci_
-API.  For a similar API that works for generic devices, see
-DMA-API.txt.
-
-Most of the 64bit platforms have special hardware that translates bus
-addresses (DMA addresses) into physical addresses.  This is similar to
-how page tables and/or a TLB translates virtual addresses to physical
-addresses on a CPU.  This is needed so that e.g. PCI devices can
-access with a Single Address Cycle (32bit DMA address) any page in the
-64bit physical address space.  Previously in Linux those 64bit
-platforms had to set artificial limits on the maximum RAM size in the
-system, so that the virt_to_bus() static scheme works (the DMA address
-translation tables were simply filled on bootup to map each bus
-address to the physical page __pa(bus_to_virt())).
-
-So that Linux can use the dynamic DMA mapping, it needs some help from the
-drivers, namely it has to take into account that DMA addresses should be
-mapped only for the time they are actually used and unmapped after the DMA
-transfer.
-
-The following API will work of course even on platforms where no such
-hardware exists, see e.g. arch/x86/include/asm/pci.h for how it is implemented on
-top of the virt_to_bus interface.
-
-First of all, you should make sure
-
-#include <linux/pci.h>
-
-is in your driver. This file will obtain for you the definition of the
-dma_addr_t (which can hold any valid DMA address for the platform)
-type which should be used everywhere you hold a DMA (bus) address
-returned from the DMA mapping functions.
-
-			 What memory is DMA'able?
-
-The first piece of information you must know is what kernel memory can
-be used with the DMA mapping facilities.  There has been an unwritten
-set of rules regarding this, and this text is an attempt to finally
-write them down.
-
-If you acquired your memory via the page allocator
-(i.e. __get_free_page*()) or the generic memory allocators
-(i.e. kmalloc() or kmem_cache_alloc()) then you may DMA to/from
-that memory using the addresses returned from those routines.
-
-This means specifically that you may _not_ use the memory/addresses
-returned from vmalloc() for DMA.  It is possible to DMA to the
-_underlying_ memory mapped into a vmalloc() area, but this requires
-walking page tables to get the physical addresses, and then
-translating each of those pages back to a kernel address using
-something like __va().  [ EDIT: Update this when we integrate
-Gerd Knorr's generic code which does this. ]
-
-This rule also means that you may use neither kernel image addresses
-(items in data/text/bss segments), nor module image addresses, nor
-stack addresses for DMA.  These could all be mapped somewhere entirely
-different than the rest of physical memory.  Even if those classes of
-memory could physically work with DMA, you'd need to ensure the I/O
-buffers were cacheline-aligned.  Without that, you'd see cacheline
-sharing problems (data corruption) on CPUs with DMA-incoherent caches.
-(The CPU could write to one word, DMA would write to a different one
-in the same cache line, and one of them could be overwritten.)
-
-Also, this means that you cannot take the return of a kmap()
-call and DMA to/from that.  This is similar to vmalloc().
-
-What about block I/O and networking buffers?  The block I/O and
-networking subsystems make sure that the buffers they use are valid
-for you to DMA from/to.
-
-			DMA addressing limitations
-
-Does your device have any DMA addressing limitations?  For example, is
-your device only capable of driving the low order 24-bits of address
-on the PCI bus for SAC DMA transfers?  If so, you need to inform the
-PCI layer of this fact.
-
-By default, the kernel assumes that your device can address the full
-32-bits in a SAC cycle.  For a 64-bit DAC capable device, this needs
-to be increased.  And for a device with limitations, as discussed in
-the previous paragraph, it needs to be decreased.
-
-pci_alloc_consistent() by default will return 32-bit DMA addresses.
-PCI-X specification requires PCI-X devices to support 64-bit
-addressing (DAC) for all transactions. And at least one platform (SGI
-SN2) requires 64-bit consistent allocations to operate correctly when
-the IO bus is in PCI-X mode. Therefore, like with pci_set_dma_mask(),
-it's good practice to call pci_set_consistent_dma_mask() to set the
-appropriate mask even if your device only supports 32-bit DMA
-(default) and especially if it's a PCI-X device.
-
-For correct operation, you must interrogate the PCI layer in your
-device probe routine to see if the PCI controller on the machine can
-properly support the DMA addressing limitation your device has.  It is
-good style to do this even if your device holds the default setting,
-because this shows that you did think about these issues wrt. your
-device.
-
-The query is performed via a call to pci_set_dma_mask():
-
-	int pci_set_dma_mask(struct pci_dev *pdev, u64 device_mask);
-
-The query for consistent allocations is performed via a call to
-pci_set_consistent_dma_mask():
-
-	int pci_set_consistent_dma_mask(struct pci_dev *pdev, u64 device_mask);
-
-Here, pdev is a pointer to the PCI device struct of your device, and
-device_mask is a bit mask describing which bits of a PCI address your
-device supports.  It returns zero if your card can perform DMA
-properly on the machine given the address mask you provided.
-
-If it returns non-zero, your device cannot perform DMA properly on
-this platform, and attempting to do so will result in undefined
-behavior.  You must either use a different mask, or not use DMA.
-
-This means that in the failure case, you have three options:
-
-1) Use another DMA mask, if possible (see below).
-2) Use some non-DMA mode for data transfer, if possible.
-3) Ignore this device and do not initialize it.
-
-It is recommended that your driver print a kernel KERN_WARNING message
-when you end up performing either #2 or #3.  In this manner, if a user
-of your driver reports that performance is bad or that the device is not
-even detected, you can ask them for the kernel messages to find out
-exactly why.
-
-The standard 32-bit addressing PCI device would do something like
-this:
-
-	if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32))) {
-		printk(KERN_WARNING
-		       "mydev: No suitable DMA available.\n");
-		goto ignore_this_device;
-	}
-
-Another common scenario is a 64-bit capable device.  The approach
-here is to try for 64-bit DAC addressing, but back down to a
-32-bit mask should that fail.  The PCI platform code may fail the
-64-bit mask not because the platform is not capable of 64-bit
-addressing.  Rather, it may fail in this case simply because
-32-bit SAC addressing is done more efficiently than DAC addressing.
-Sparc64 is one platform which behaves in this way.
-
-Here is how you would handle a 64-bit capable device which can drive
-all 64-bits when accessing streaming DMA:
-
-	int using_dac;
-
-	if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(64))) {
-		using_dac = 1;
-	} else if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(32))) {
-		using_dac = 0;
-	} else {
-		printk(KERN_WARNING
-		       "mydev: No suitable DMA available.\n");
-		goto ignore_this_device;
-	}
-
-If a card is capable of using 64-bit consistent allocations as well,
-the case would look like this:
-
-	int using_dac, consistent_using_dac;
-
-	if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(64))) {
-		using_dac = 1;
-	   	consistent_using_dac = 1;
-		pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
-	} else if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(32))) {
-		using_dac = 0;
-		consistent_using_dac = 0;
-		pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
-	} else {
-		printk(KERN_WARNING
-		       "mydev: No suitable DMA available.\n");
-		goto ignore_this_device;
-	}
-
-pci_set_consistent_dma_mask() will always be able to set the same or a
-smaller mask as pci_set_dma_mask(). However for the rare case that a
-device driver only uses consistent allocations, one would have to
-check the return value from pci_set_consistent_dma_mask().
-
-Finally, if your device can only drive the low 24-bits of
-address during PCI bus mastering you might do something like:
-
-	if (pci_set_dma_mask(pdev, DMA_BIT_MASK(24))) {
-		printk(KERN_WARNING
-		       "mydev: 24-bit DMA addressing not available.\n");
-		goto ignore_this_device;
-	}
-
-When pci_set_dma_mask() is successful, and returns zero, the PCI layer
-saves away this mask you have provided.  The PCI layer will use this
-information later when you make DMA mappings.
-
-There is a case which we are aware of at this time, which is worth
-mentioning in this documentation.  If your device supports multiple
-functions (for example a sound card provides playback and record
-functions) and the various different functions have _different_
-DMA addressing limitations, you may wish to probe each mask and
-only provide the functionality which the machine can handle.  It
-is important that the last call to pci_set_dma_mask() be for the
-most specific mask.
-
-Here is pseudo-code showing how this might be done:
-
-	#define PLAYBACK_ADDRESS_BITS	DMA_BIT_MASK(32)
-	#define RECORD_ADDRESS_BITS	DMA_BIT_MASK(24)
-
-	struct my_sound_card *card;
-	struct pci_dev *pdev;
-
-	...
-	if (!pci_set_dma_mask(pdev, PLAYBACK_ADDRESS_BITS)) {
-		card->playback_enabled = 1;
-	} else {
-		card->playback_enabled = 0;
-		printk(KERN_WARNING "%s: Playback disabled due to DMA limitations.\n",
-		       card->name);
-	}
-	if (!pci_set_dma_mask(pdev, RECORD_ADDRESS_BITS)) {
-		card->record_enabled = 1;
-	} else {
-		card->record_enabled = 0;
-		printk(KERN_WARNING "%s: Record disabled due to DMA limitations.\n",
-		       card->name);
-	}
-
-A sound card was used as an example here because this genre of PCI
-devices seems to be littered with ISA chips given a PCI front end,
-and thus retaining the 16MB DMA addressing limitations of ISA.
-
-			Types of DMA mappings
-
-There are two types of DMA mappings:
-
-- Consistent DMA mappings which are usually mapped at driver
-  initialization, unmapped at the end and for which the hardware should
-  guarantee that the device and the CPU can access the data
-  in parallel and will see updates made by each other without any
-  explicit software flushing.
-
-  Think of "consistent" as "synchronous" or "coherent".
-
-  The current default is to return consistent memory in the low 32
-  bits of the PCI bus space.  However, for future compatibility you
-  should set the consistent mask even if this default is fine for your
-  driver.
-
-  Good examples of what to use consistent mappings for are:
-
-	- Network card DMA ring descriptors.
-	- SCSI adapter mailbox command data structures.
-	- Device firmware microcode executed out of
-	  main memory.
-
-  The invariant these examples all require is that any CPU store
-  to memory is immediately visible to the device, and vice
-  versa.  Consistent mappings guarantee this.
-
-  IMPORTANT: Consistent DMA memory does not preclude the usage of
-             proper memory barriers.  The CPU may reorder stores to
-	     consistent memory just as it may normal memory.  Example:
-	     if it is important for the device to see the first word
-	     of a descriptor updated before the second, you must do
-	     something like:
-
-		desc->word0 = address;
-		wmb();
-		desc->word1 = DESC_VALID;
-
-             in order to get correct behavior on all platforms.
-
-	     Also, on some platforms your driver may need to flush CPU write
-	     buffers in much the same way as it needs to flush write buffers
-	     found in PCI bridges (such as by reading a register's value
-	     after writing it).
-
-- Streaming DMA mappings which are usually mapped for one DMA transfer,
-  unmapped right after it (unless you use pci_dma_sync_* below) and for which
-  hardware can optimize for sequential accesses.
-
-  This of "streaming" as "asynchronous" or "outside the coherency
-  domain".
-
-  Good examples of what to use streaming mappings for are:
-
-	- Networking buffers transmitted/received by a device.
-	- Filesystem buffers written/read by a SCSI device.
-
-  The interfaces for using this type of mapping were designed in
-  such a way that an implementation can make whatever performance
-  optimizations the hardware allows.  To this end, when using
-  such mappings you must be explicit about what you want to happen.
-
-Neither type of DMA mapping has alignment restrictions that come
-from PCI, although some devices may have such restrictions.
-Also, systems with caches that aren't DMA-coherent will work better
-when the underlying buffers don't share cache lines with other data.
-
-
-		 Using Consistent DMA mappings.
-
-To allocate and map large (PAGE_SIZE or so) consistent DMA regions,
-you should do:
-
-	dma_addr_t dma_handle;
-
-	cpu_addr = pci_alloc_consistent(pdev, size, &dma_handle);
-
-where pdev is a struct pci_dev *. This may be called in interrupt context.
-You should use dma_alloc_coherent (see DMA-API.txt) for buses
-where devices don't have struct pci_dev (like ISA, EISA).
-
-This argument is needed because the DMA translations may be bus
-specific (and often is private to the bus which the device is attached
-to).
-
-Size is the length of the region you want to allocate, in bytes.
-
-This routine will allocate RAM for that region, so it acts similarly to
-__get_free_pages (but takes size instead of a page order).  If your
-driver needs regions sized smaller than a page, you may prefer using
-the pci_pool interface, described below.
-
-The consistent DMA mapping interfaces, for non-NULL pdev, will by
-default return a DMA address which is SAC (Single Address Cycle)
-addressable.  Even if the device indicates (via PCI dma mask) that it
-may address the upper 32-bits and thus perform DAC cycles, consistent
-allocation will only return > 32-bit PCI addresses for DMA if the
-consistent dma mask has been explicitly changed via
-pci_set_consistent_dma_mask().  This is true of the pci_pool interface
-as well.
-
-pci_alloc_consistent returns two values: the virtual address which you
-can use to access it from the CPU and dma_handle which you pass to the
-card.
-
-The cpu return address and the DMA bus master address are both
-guaranteed to be aligned to the smallest PAGE_SIZE order which
-is greater than or equal to the requested size.  This invariant
-exists (for example) to guarantee that if you allocate a chunk
-which is smaller than or equal to 64 kilobytes, the extent of the
-buffer you receive will not cross a 64K boundary.
-
-To unmap and free such a DMA region, you call:
-
-	pci_free_consistent(pdev, size, cpu_addr, dma_handle);
-
-where pdev, size are the same as in the above call and cpu_addr and
-dma_handle are the values pci_alloc_consistent returned to you.
-This function may not be called in interrupt context.
-
-If your driver needs lots of smaller memory regions, you can write
-custom code to subdivide pages returned by pci_alloc_consistent,
-or you can use the pci_pool API to do that.  A pci_pool is like
-a kmem_cache, but it uses pci_alloc_consistent not __get_free_pages.
-Also, it understands common hardware constraints for alignment,
-like queue heads needing to be aligned on N byte boundaries.
-
-Create a pci_pool like this:
-
-	struct pci_pool *pool;
-
-	pool = pci_pool_create(name, pdev, size, align, alloc);
-
-The "name" is for diagnostics (like a kmem_cache name); pdev and size
-are as above.  The device's hardware alignment requirement for this
-type of data is "align" (which is expressed in bytes, and must be a
-power of two).  If your device has no boundary crossing restrictions,
-pass 0 for alloc; passing 4096 says memory allocated from this pool
-must not cross 4KByte boundaries (but at that time it may be better to
-go for pci_alloc_consistent directly instead).
-
-Allocate memory from a pci pool like this:
-
-	cpu_addr = pci_pool_alloc(pool, flags, &dma_handle);
-
-flags are SLAB_KERNEL if blocking is permitted (not in_interrupt nor
-holding SMP locks), SLAB_ATOMIC otherwise.  Like pci_alloc_consistent,
-this returns two values, cpu_addr and dma_handle.
-
-Free memory that was allocated from a pci_pool like this:
-
-	pci_pool_free(pool, cpu_addr, dma_handle);
-
-where pool is what you passed to pci_pool_alloc, and cpu_addr and
-dma_handle are the values pci_pool_alloc returned. This function
-may be called in interrupt context.
-
-Destroy a pci_pool by calling:
-
-	pci_pool_destroy(pool);
-
-Make sure you've called pci_pool_free for all memory allocated
-from a pool before you destroy the pool. This function may not
-be called in interrupt context.
-
-			DMA Direction
-
-The interfaces described in subsequent portions of this document
-take a DMA direction argument, which is an integer and takes on
-one of the following values:
-
- PCI_DMA_BIDIRECTIONAL
- PCI_DMA_TODEVICE
- PCI_DMA_FROMDEVICE
- PCI_DMA_NONE
-
-One should provide the exact DMA direction if you know it.
-
-PCI_DMA_TODEVICE means "from main memory to the PCI device"
-PCI_DMA_FROMDEVICE means "from the PCI device to main memory"
-It is the direction in which the data moves during the DMA
-transfer.
-
-You are _strongly_ encouraged to specify this as precisely
-as you possibly can.
-
-If you absolutely cannot know the direction of the DMA transfer,
-specify PCI_DMA_BIDIRECTIONAL.  It means that the DMA can go in
-either direction.  The platform guarantees that you may legally
-specify this, and that it will work, but this may be at the
-cost of performance for example.
-
-The value PCI_DMA_NONE is to be used for debugging.  One can
-hold this in a data structure before you come to know the
-precise direction, and this will help catch cases where your
-direction tracking logic has failed to set things up properly.
-
-Another advantage of specifying this value precisely (outside of
-potential platform-specific optimizations of such) is for debugging.
-Some platforms actually have a write permission boolean which DMA
-mappings can be marked with, much like page protections in the user
-program address space.  Such platforms can and do report errors in the
-kernel logs when the PCI controller hardware detects violation of the
-permission setting.
-
-Only streaming mappings specify a direction, consistent mappings
-implicitly have a direction attribute setting of
-PCI_DMA_BIDIRECTIONAL.
-
-The SCSI subsystem tells you the direction to use in the
-'sc_data_direction' member of the SCSI command your driver is
-working on.
-
-For Networking drivers, it's a rather simple affair.  For transmit
-packets, map/unmap them with the PCI_DMA_TODEVICE direction
-specifier.  For receive packets, just the opposite, map/unmap them
-with the PCI_DMA_FROMDEVICE direction specifier.
-
-		  Using Streaming DMA mappings
-
-The streaming DMA mapping routines can be called from interrupt
-context.  There are two versions of each map/unmap, one which will
-map/unmap a single memory region, and one which will map/unmap a
-scatterlist.
-
-To map a single region, you do:
-
-	struct pci_dev *pdev = mydev->pdev;
-	dma_addr_t dma_handle;
-	void *addr = buffer->ptr;
-	size_t size = buffer->len;
-
-	dma_handle = pci_map_single(pdev, addr, size, direction);
-
-and to unmap it:
-
-	pci_unmap_single(pdev, dma_handle, size, direction);
-
-You should call pci_unmap_single when the DMA activity is finished, e.g.
-from the interrupt which told you that the DMA transfer is done.
-
-Using cpu pointers like this for single mappings has a disadvantage,
-you cannot reference HIGHMEM memory in this way.  Thus, there is a
-map/unmap interface pair akin to pci_{map,unmap}_single.  These
-interfaces deal with page/offset pairs instead of cpu pointers.
-Specifically:
-
-	struct pci_dev *pdev = mydev->pdev;
-	dma_addr_t dma_handle;
-	struct page *page = buffer->page;
-	unsigned long offset = buffer->offset;
-	size_t size = buffer->len;
-
-	dma_handle = pci_map_page(pdev, page, offset, size, direction);
-
-	...
-
-	pci_unmap_page(pdev, dma_handle, size, direction);
-
-Here, "offset" means byte offset within the given page.
-
-With scatterlists, you map a region gathered from several regions by:
-
-	int i, count = pci_map_sg(pdev, sglist, nents, direction);
-	struct scatterlist *sg;
-
-	for_each_sg(sglist, sg, count, i) {
-		hw_address[i] = sg_dma_address(sg);
-		hw_len[i] = sg_dma_len(sg);
-	}
-
-where nents is the number of entries in the sglist.
-
-The implementation is free to merge several consecutive sglist entries
-into one (e.g. if DMA mapping is done with PAGE_SIZE granularity, any
-consecutive sglist entries can be merged into one provided the first one
-ends and the second one starts on a page boundary - in fact this is a huge
-advantage for cards which either cannot do scatter-gather or have very
-limited number of scatter-gather entries) and returns the actual number
-of sg entries it mapped them to. On failure 0 is returned.
-
-Then you should loop count times (note: this can be less than nents times)
-and use sg_dma_address() and sg_dma_len() macros where you previously
-accessed sg->address and sg->length as shown above.
-
-To unmap a scatterlist, just call:
-
-	pci_unmap_sg(pdev, sglist, nents, direction);
-
-Again, make sure DMA activity has already finished.
-
-PLEASE NOTE:  The 'nents' argument to the pci_unmap_sg call must be
-              the _same_ one you passed into the pci_map_sg call,
-	      it should _NOT_ be the 'count' value _returned_ from the
-              pci_map_sg call.
-
-Every pci_map_{single,sg} call should have its pci_unmap_{single,sg}
-counterpart, because the bus address space is a shared resource (although
-in some ports the mapping is per each BUS so less devices contend for the
-same bus address space) and you could render the machine unusable by eating
-all bus addresses.
-
-If you need to use the same streaming DMA region multiple times and touch
-the data in between the DMA transfers, the buffer needs to be synced
-properly in order for the cpu and device to see the most uptodate and
-correct copy of the DMA buffer.
-
-So, firstly, just map it with pci_map_{single,sg}, and after each DMA
-transfer call either:
-
-	pci_dma_sync_single_for_cpu(pdev, dma_handle, size, direction);
-
-or:
-
-	pci_dma_sync_sg_for_cpu(pdev, sglist, nents, direction);
-
-as appropriate.
-
-Then, if you wish to let the device get at the DMA area again,
-finish accessing the data with the cpu, and then before actually
-giving the buffer to the hardware call either:
-
-	pci_dma_sync_single_for_device(pdev, dma_handle, size, direction);
-
-or:
-
-	pci_dma_sync_sg_for_device(dev, sglist, nents, direction);
-
-as appropriate.
-
-After the last DMA transfer call one of the DMA unmap routines
-pci_unmap_{single,sg}. If you don't touch the data from the first pci_map_*
-call till pci_unmap_*, then you don't have to call the pci_dma_sync_*
-routines at all.
-
-Here is pseudo code which shows a situation in which you would need
-to use the pci_dma_sync_*() interfaces.
-
-	my_card_setup_receive_buffer(struct my_card *cp, char *buffer, int len)
-	{
-		dma_addr_t mapping;
-
-		mapping = pci_map_single(cp->pdev, buffer, len, PCI_DMA_FROMDEVICE);
-
-		cp->rx_buf = buffer;
-		cp->rx_len = len;
-		cp->rx_dma = mapping;
-
-		give_rx_buf_to_card(cp);
-	}
-
-	...
-
-	my_card_interrupt_handler(int irq, void *devid, struct pt_regs *regs)
-	{
-		struct my_card *cp = devid;
-
-		...
-		if (read_card_status(cp) == RX_BUF_TRANSFERRED) {
-			struct my_card_header *hp;
-
-			/* Examine the header to see if we wish
-			 * to accept the data.  But synchronize
-			 * the DMA transfer with the CPU first
-			 * so that we see updated contents.
-			 */
-			pci_dma_sync_single_for_cpu(cp->pdev, cp->rx_dma,
-						    cp->rx_len,
-						    PCI_DMA_FROMDEVICE);
-
-			/* Now it is safe to examine the buffer. */
-			hp = (struct my_card_header *) cp->rx_buf;
-			if (header_is_ok(hp)) {
-				pci_unmap_single(cp->pdev, cp->rx_dma, cp->rx_len,
-						 PCI_DMA_FROMDEVICE);
-				pass_to_upper_layers(cp->rx_buf);
-				make_and_setup_new_rx_buf(cp);
-			} else {
-				/* Just sync the buffer and give it back
-				 * to the card.
-				 */
-				pci_dma_sync_single_for_device(cp->pdev,
-							       cp->rx_dma,
-							       cp->rx_len,
-							       PCI_DMA_FROMDEVICE);
-				give_rx_buf_to_card(cp);
-			}
-		}
-	}
-
-Drivers converted fully to this interface should not use virt_to_bus any
-longer, nor should they use bus_to_virt. Some drivers have to be changed a
-little bit, because there is no longer an equivalent to bus_to_virt in the
-dynamic DMA mapping scheme - you have to always store the DMA addresses
-returned by the pci_alloc_consistent, pci_pool_alloc, and pci_map_single
-calls (pci_map_sg stores them in the scatterlist itself if the platform
-supports dynamic DMA mapping in hardware) in your driver structures and/or
-in the card registers.
-
-All PCI drivers should be using these interfaces with no exceptions.
-It is planned to completely remove virt_to_bus() and bus_to_virt() as
-they are entirely deprecated.  Some ports already do not provide these
-as it is impossible to correctly support them.
-
-		Optimizing Unmap State Space Consumption
-
-On many platforms, pci_unmap_{single,page}() is simply a nop.
-Therefore, keeping track of the mapping address and length is a waste
-of space.  Instead of filling your drivers up with ifdefs and the like
-to "work around" this (which would defeat the whole purpose of a
-portable API) the following facilities are provided.
-
-Actually, instead of describing the macros one by one, we'll
-transform some example code.
-
-1) Use DECLARE_PCI_UNMAP_{ADDR,LEN} in state saving structures.
-   Example, before:
-
-	struct ring_state {
-		struct sk_buff *skb;
-		dma_addr_t mapping;
-		__u32 len;
-	};
-
-   after:
-
-	struct ring_state {
-		struct sk_buff *skb;
-		DECLARE_PCI_UNMAP_ADDR(mapping)
-		DECLARE_PCI_UNMAP_LEN(len)
-	};
-
-   NOTE: DO NOT put a semicolon at the end of the DECLARE_*()
-         macro.
-
-2) Use pci_unmap_{addr,len}_set to set these values.
-   Example, before:
-
-	ringp->mapping = FOO;
-	ringp->len = BAR;
-
-   after:
-
-	pci_unmap_addr_set(ringp, mapping, FOO);
-	pci_unmap_len_set(ringp, len, BAR);
-
-3) Use pci_unmap_{addr,len} to access these values.
-   Example, before:
-
-	pci_unmap_single(pdev, ringp->mapping, ringp->len,
-			 PCI_DMA_FROMDEVICE);
-
-   after:
-
-	pci_unmap_single(pdev,
-			 pci_unmap_addr(ringp, mapping),
-			 pci_unmap_len(ringp, len),
-			 PCI_DMA_FROMDEVICE);
-
-It really should be self-explanatory.  We treat the ADDR and LEN
-separately, because it is possible for an implementation to only
-need the address in order to perform the unmap operation.
-
-			Platform Issues
-
-If you are just writing drivers for Linux and do not maintain
-an architecture port for the kernel, you can safely skip down
-to "Closing".
-
-1) Struct scatterlist requirements.
-
-   Struct scatterlist must contain, at a minimum, the following
-   members:
-
-	struct page *page;
-	unsigned int offset;
-	unsigned int length;
-
-   The base address is specified by a "page+offset" pair.
-
-   Previous versions of struct scatterlist contained a "void *address"
-   field that was sometimes used instead of page+offset.  As of Linux
-   2.5., page+offset is always used, and the "address" field has been
-   deleted.
-
-2) More to come...
-
-			Handling Errors
-
-DMA address space is limited on some architectures and an allocation
-failure can be determined by:
-
-- checking if pci_alloc_consistent returns NULL or pci_map_sg returns 0
-
-- checking the returned dma_addr_t of pci_map_single and pci_map_page
-  by using pci_dma_mapping_error():
-
-	dma_addr_t dma_handle;
-
-	dma_handle = pci_map_single(pdev, addr, size, direction);
-	if (pci_dma_mapping_error(pdev, dma_handle)) {
-		/*
-		 * reduce current DMA mapping usage,
-		 * delay and try again later or
-		 * reset driver.
-		 */
-	}
-
-			   Closing
-
-This document, and the API itself, would not be in it's current
-form without the feedback and suggestions from numerous individuals.
-We would like to specifically mention, in no particular order, the
-following people:
-
-	Russell King <rmk@arm.linux.org.uk>
-	Leo Dagum <dagum@barrel.engr.sgi.com>
-	Ralf Baechle <ralf@oss.sgi.com>
-	Grant Grundler <grundler@cup.hp.com>
-	Jay Estabrook <Jay.Estabrook@compaq.com>
-	Thomas Sailer <sailer@ife.ee.ethz.ch>
-	Andrea Arcangeli <andrea@suse.de>
-	Jens Axboe <jens.axboe@oracle.com>
-	David Mosberger-Tang <davidm@hpl.hp.com>

Documentation/PCI/pci-error-recovery.txt

@@ -216,7 +216,7 @@ The driver should return one of the following result codes:
 
 		- PCI_ERS_RESULT_NEED_RESET
 		  Driver returns this if it thinks the device is not
-		  recoverable in it's current state and it needs a slot
+		  recoverable in its current state and it needs a slot
 		  reset to proceed.
 
 		- PCI_ERS_RESULT_DISCONNECT
@@ -241,7 +241,7 @@ in working condition.
 
 The driver is not supposed to restart normal driver I/O operations
 at this point.  It should limit itself to "probing" the device to
-check it's recoverability status. If all is right, then the platform
+check its recoverability status. If all is right, then the platform
 will call resume() once all drivers have ack'd link_reset().
 
 	Result codes:

Documentation/PCI/pci.txt

@@ -581,7 +581,7 @@ to be handled by platform and generic code, not individual drivers.
 8. Vendor and device identifications
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-One is not not required to add new device ids to include/linux/pci_ids.h.
+One is not required to add new device ids to include/linux/pci_ids.h.
 Please add PCI_VENDOR_ID_xxx for vendors and a hex constant for device ids.
 
 PCI_VENDOR_ID_xxx constants are re-used. The device ids are arbitrary

Documentation/PCI/pcieaer-howto.txt

@@ -13,7 +13,7 @@ Reporting (AER) driver and provides information on how to use it, as
 well as how to enable the drivers of endpoint devices to conform with
 PCI Express AER driver.
 
-1.2 Copyright © Intel Corporation 2006.
+1.2 Copyright (C) Intel Corporation 2006.
 
 1.3 What is the PCI Express AER Driver?
 
@@ -71,15 +71,11 @@ console. If it's a correctable error, it is outputed as a warning.
 Otherwise, it is printed as an error. So users could choose different
 log level to filter out correctable error messages.
 
-Below shows an example.
-+------ PCI-Express Device Error -----+
-Error Severity          : Uncorrected (Fatal)
-PCIE Bus Error type     : Transaction Layer
-Unsupported Request     : First
-Requester ID            : 0500
-VendorID=8086h, DeviceID=0329h, Bus=05h, Device=00h, Function=00h
-TLB Header:
-04000001 00200a03 05010000 00050100
+Below shows an example:
+0000:50:00.0: PCIe Bus Error: severity=Uncorrected (Fatal), type=Transaction Layer, id=0500(Requester ID)
+0000:50:00.0:   device [8086:0329] error status/mask=00100000/00000000
+0000:50:00.0:    [20] Unsupported Request    (First)
+0000:50:00.0:   TLP Header: 04000001 00200a03 05010000 00050100
 
 In the example, 'Requester ID' means the ID of the device who sends
 the error message to root port. Pls. refer to pci express specs for
@@ -112,7 +108,7 @@ but the PCI Express link itself is fully functional. Fatal errors, on
 the other hand, cause the link to be unreliable.
 
 When AER is enabled, a PCI Express device will automatically send an
-error message to the PCIE root port above it when the device captures
+error message to the PCIe root port above it when the device captures
 an error. The Root Port, upon receiving an error reporting message,
 internally processes and logs the error message in its PCI Express
 capability structure. Error information being logged includes storing
@@ -198,8 +194,9 @@ to reset link, AER port service driver is required to provide the
 function to reset link. Firstly, kernel looks for if the upstream
 component has an aer driver. If it has, kernel uses the reset_link
 callback of the aer driver. If the upstream component has no aer driver
-and the port is downstream port, we will use the aer driver of the
-root port who reports the AER error. As for upstream ports,
+and the port is downstream port, we will perform a hot reset as the
+default by setting the Secondary Bus Reset bit of the Bridge Control
+register associated with the downstream port. As for upstream ports,
 they should provide their own aer service drivers with reset_link
 function. If error_detected returns PCI_ERS_RESULT_CAN_RECOVER and
 reset_link returns PCI_ERS_RESULT_RECOVERED, the error handling goes
@@ -253,11 +250,11 @@ cleanup uncorrectable status register. Pls. refer to section 3.3.
 
 4. Software error injection
 
-Debugging PCIE AER error recovery code is quite difficult because it
+Debugging PCIe AER error recovery code is quite difficult because it
 is hard to trigger real hardware errors. Software based error
-injection can be used to fake various kinds of PCIE errors.
+injection can be used to fake various kinds of PCIe errors.
 
-First you should enable PCIE AER software error injection in kernel
+First you should enable PCIe AER software error injection in kernel
 configuration, that is, following item should be in your .config.
 
 CONFIG_PCIEAER_INJECT=y or CONFIG_PCIEAER_INJECT=m

Documentation/RCU/00-INDEX

@@ -6,16 +6,22 @@ checklist.txt
 	- Review Checklist for RCU Patches
 listRCU.txt
 	- Using RCU to Protect Read-Mostly Linked Lists
+lockdep.txt
+	- RCU and lockdep checking
 NMI-RCU.txt
 	- Using RCU to Protect Dynamic NMI Handlers
+rcubarrier.txt
+	- RCU and Unloadable Modules
+rculist_nulls.txt
+	- RCU list primitives for use with SLAB_DESTROY_BY_RCU
 rcuref.txt
 	- Reference-count design for elements of lists/arrays protected by RCU
 rcu.txt
 	- RCU Concepts
-rcubarrier.txt
-	- Unloading modules that use RCU callbacks
 RTFP.txt
 	- List of RCU papers (bibliography) going back to 1980.
+stallwarn.txt
+	- RCU CPU stall warnings (CONFIG_RCU_CPU_STALL_DETECTOR)
 torture.txt
 	- RCU Torture Test Operation (CONFIG_RCU_TORTURE_TEST)
 trace.txt

Documentation/RCU/NMI-RCU.txt

@@ -34,7 +34,7 @@ NMI handler.
 		cpu = smp_processor_id();
 		++nmi_count(cpu);
 
-		if (!rcu_dereference(nmi_callback)(regs, cpu))
+		if (!rcu_dereference_sched(nmi_callback)(regs, cpu))
 			default_do_nmi(regs);
 
 		nmi_exit();
@@ -47,12 +47,13 @@ function pointer.  If this handler returns zero, do_nmi() invokes the
 default_do_nmi() function to handle a machine-specific NMI.  Finally,
 preemption is restored.
 
-Strictly speaking, rcu_dereference() is not needed, since this code runs
-only on i386, which does not need rcu_dereference() anyway.  However,
-it is a good documentation aid, particularly for anyone attempting to
-do something similar on Alpha.
+In theory, rcu_dereference_sched() is not needed, since this code runs
+only on i386, which in theory does not need rcu_dereference_sched()
+anyway.  However, in practice it is a good documentation aid, particularly
+for anyone attempting to do something similar on Alpha or on systems
+with aggressive optimizing compilers.
 
-Quick Quiz:  Why might the rcu_dereference() be necessary on Alpha,
+Quick Quiz:  Why might the rcu_dereference_sched() be necessary on Alpha,
 	     given that the code referenced by the pointer is read-only?
 
 
@@ -99,17 +100,21 @@ invoke irq_enter() and irq_exit() on NMI entry and exit, respectively.
 
 Answer to Quick Quiz
 
-	Why might the rcu_dereference() be necessary on Alpha, given
+	Why might the rcu_dereference_sched() be necessary on Alpha, given
 	that the code referenced by the pointer is read-only?
 
 	Answer: The caller to set_nmi_callback() might well have
-		initialized some data that is to be used by the
-		new NMI handler.  In this case, the rcu_dereference()
-		would be needed, because otherwise a CPU that received
-		an NMI just after the new handler was set might see
-		the pointer to the new NMI handler, but the old
-		pre-initialized version of the handler's data.
-
-		More important, the rcu_dereference() makes it clear
-		to someone reading the code that the pointer is being
-		protected by RCU.
+		initialized some data that is to be used by the new NMI
+		handler.  In this case, the rcu_dereference_sched() would
+		be needed, because otherwise a CPU that received an NMI
+		just after the new handler was set might see the pointer
+		to the new NMI handler, but the old pre-initialized
+		version of the handler's data.
+
+		This same sad story can happen on other CPUs when using
+		a compiler with aggressive pointer-value speculation
+		optimizations.
+
+		More important, the rcu_dereference_sched() makes it
+		clear to someone reading the code that the pointer is
+		being protected by RCU-sched.

Documentation/RCU/RTFP.txt

@@ -25,10 +25,10 @@ to be referencing the data structure.  However, this mechanism was not
 optimized for modern computer systems, which is not surprising given
 that these overheads were not so expensive in the mid-80s.  Nonetheless,
 passive serialization appears to be the first deferred-destruction
-mechanism to be used in production.  Furthermore, the relevant patent has
-lapsed, so this approach may be used in non-GPL software, if desired.
-(In contrast, use of RCU is permitted only in software licensed under
-GPL.  Sorry!!!)
+mechanism to be used in production.  Furthermore, the relevant patent
+has lapsed, so this approach may be used in non-GPL software, if desired.
+(In contrast, implementation of RCU is permitted only in software licensed
+under either GPL or LGPL.  Sorry!!!)
 
 In 1990, Pugh [Pugh90] noted that explicitly tracking which threads
 were reading a given data structure permitted deferred free to operate
@@ -150,6 +150,18 @@ preemptible RCU [PaulEMcKenney2007PreemptibleRCU], and the three-part
 LWN "What is RCU?" series [PaulEMcKenney2007WhatIsRCUFundamentally,
 PaulEMcKenney2008WhatIsRCUUsage, and PaulEMcKenney2008WhatIsRCUAPI].
 
+2008 saw a journal paper on real-time RCU [DinakarGuniguntala2008IBMSysJ],
+a history of how Linux changed RCU more than RCU changed Linux
+[PaulEMcKenney2008RCUOSR], and a design overview of hierarchical RCU
+[PaulEMcKenney2008HierarchicalRCU].
+
+2009 introduced user-level RCU algorithms [PaulEMcKenney2009MaliciousURCU],
+which Mathieu Desnoyers is now maintaining [MathieuDesnoyers2009URCU]
+[MathieuDesnoyersPhD].  TINY_RCU [PaulEMcKenney2009BloatWatchRCU] made
+its appearance, as did expedited RCU [PaulEMcKenney2009expeditedRCU].
+The problem of resizeable RCU-protected hash tables may now be on a path
+to a solution [JoshTriplett2009RPHash].
+
 Bibtex Entries
 
 @article{Kung80
@@ -594,7 +606,7 @@ Suparna Bhattacharya"
 ,Year="2006"
 ,pages="v2 123-138"
 ,note="Available:
-\url{http://www.linuxsymposium.org/2006/view_abstract.php?content_key=184}
+\url{http://www.linuxsymposium.org/2006/index_2006.php}
 \url{http://www.rdrop.com/users/paulmck/RCU/OLSrtRCU.2006.08.11a.pdf}
 [Viewed January 1, 2007]"
 ,annotation="
@@ -730,6 +742,11 @@ Revised:
 "
 }
 
+#
+#	"What is RCU?" LWN series.
+#
+########################################################################
+
 @article{DinakarGuniguntala2008IBMSysJ
 ,author="D. Guniguntala and P. E. McKenney and J. Triplett and J. Walpole"
 ,title="The read-copy-update mechanism for supporting real-time applications on shared-memory multiprocessor systems with {Linux}"
@@ -820,3 +837,39 @@ Revised:
 	Uniprocessor assumptions allow simplified RCU implementation.
 "
 }
+
+@unpublished{PaulEMcKenney2009expeditedRCU
+,Author="Paul E. McKenney"
+,Title="[{PATCH} -tip 0/3] expedited 'big hammer' {RCU} grace periods"
+,month="June"
+,day="25"
+,year="2009"
+,note="Available:
+\url{http://lkml.org/lkml/2009/6/25/306}
+[Viewed August 16, 2009]"
+,annotation="
+	First posting of expedited RCU to be accepted into -tip.
+"
+}
+
+@unpublished{JoshTriplett2009RPHash
+,Author="Josh Triplett"
+,Title="Scalable concurrent hash tables via relativistic programming"
+,month="September"
+,year="2009"
+,note="Linux Plumbers Conference presentation"
+,annotation="
+	RP fun with hash tables.
+"
+}
+
+@phdthesis{MathieuDesnoyersPhD
+, title  = "Low-Impact Operating System Tracing"
+, author = "Mathieu Desnoyers"
+, school = "Ecole Polytechnique de Montr\'{e}al"
+, month  = "December"
+, year   = 2009
+,note="Available:
+\url{http://www.lttng.org/pub/thesis/desnoyers-dissertation-2009-12.pdf}
+[Viewed December 9, 2009]"
+}

Documentation/RCU/checklist.txt

@@ -8,13 +8,12 @@ would cause.  This list is based on experiences reviewing such patches
 over a rather long period of time, but improvements are always welcome!
 
 0.	Is RCU being applied to a read-mostly situation?  If the data
-	structure is updated more than about 10% of the time, then
-	you should strongly consider some other approach, unless
-	detailed performance measurements show that RCU is nonetheless
-	the right tool for the job.  Yes, you might think of RCU
-	as simply cutting overhead off of the readers and imposing it
-	on the writers.  That is exactly why normal uses of RCU will
-	do much more reading than updating.
+	structure is updated more than about 10% of the time, then you
+	should strongly consider some other approach, unless detailed
+	performance measurements show that RCU is nonetheless the right
+	tool for the job.  Yes, RCU does reduce read-side overhead by
+	increasing write-side overhead, which is exactly why normal uses
+	of RCU will do much more reading than updating.
 
 	Another exception is where performance is not an issue, and RCU
 	provides a simpler implementation.  An example of this situation
@@ -35,13 +34,13 @@ over a rather long period of time, but improvements are always welcome!
 
 	If you choose #b, be prepared to describe how you have handled
 	memory barriers on weakly ordered machines (pretty much all of
-	them -- even x86 allows reads to be reordered), and be prepared
-	to explain why this added complexity is worthwhile.  If you
-	choose #c, be prepared to explain how this single task does not
-	become a major bottleneck on big multiprocessor machines (for
-	example, if the task is updating information relating to itself
-	that other tasks can read, there by definition can be no
-	bottleneck).
+	them -- even x86 allows later loads to be reordered to precede
+	earlier stores), and be prepared to explain why this added
+	complexity is worthwhile.  If you choose #c, be prepared to
+	explain how this single task does not become a major bottleneck on
+	big multiprocessor machines (for example, if the task is updating
+	information relating to itself that other tasks can read, there
+	by definition can be no bottleneck).
 
 2.	Do the RCU read-side critical sections make proper use of
 	rcu_read_lock() and friends?  These primitives are needed
@@ -51,8 +50,10 @@ over a rather long period of time, but improvements are always welcome!
 	actuarial risk of your kernel.
 
 	As a rough rule of thumb, any dereference of an RCU-protected
-	pointer must be covered by rcu_read_lock() or rcu_read_lock_bh()
-	or by the appropriate update-side lock.
+	pointer must be covered by rcu_read_lock(), rcu_read_lock_bh(),
+	rcu_read_lock_sched(), or by the appropriate update-side lock.
+	Disabling of preemption can serve as rcu_read_lock_sched(), but
+	is less readable.
 
 3.	Does the update code tolerate concurrent accesses?
 
@@ -62,25 +63,27 @@ over a rather long period of time, but improvements are always welcome!
 	of ways to handle this concurrency, depending on the situation:
 
 	a.	Use the RCU variants of the list and hlist update
-		primitives to add, remove, and replace elements on an
-		RCU-protected list.  Alternatively, use the RCU-protected
-		trees that have been added to the Linux kernel.
+		primitives to add, remove, and replace elements on
+		an RCU-protected list.	Alternatively, use the other
+		RCU-protected data structures that have been added to
+		the Linux kernel.
 
 		This is almost always the best approach.
 
 	b.	Proceed as in (a) above, but also maintain per-element
 		locks (that are acquired by both readers and writers)
 		that guard per-element state.  Of course, fields that
-		the readers refrain from accessing can be guarded by the
-		update-side lock.
+		the readers refrain from accessing can be guarded by
+		some other lock acquired only by updaters, if desired.
 
 		This works quite well, also.
 
 	c.	Make updates appear atomic to readers.  For example,
-		pointer updates to properly aligned fields will appear
-		atomic, as will individual atomic primitives.  Operations
-		performed under a lock and sequences of multiple atomic
-		primitives will -not- appear to be atomic.
+		pointer updates to properly aligned fields will
+		appear atomic, as will individual atomic primitives.
+		Sequences of perations performed under a lock will -not-
+		appear to be atomic to RCU readers, nor will sequences
+		of multiple atomic primitives.
 
 		This can work, but is starting to get a bit tricky.
 
@@ -98,9 +101,9 @@ over a rather long period of time, but improvements are always welcome!
 		a new structure containing updated values.
 
 4.	Weakly ordered CPUs pose special challenges.  Almost all CPUs
-	are weakly ordered -- even i386 CPUs allow reads to be reordered.
-	RCU code must take all of the following measures to prevent
-	memory-corruption problems:
+	are weakly ordered -- even x86 CPUs allow later loads to be
+	reordered to precede earlier stores.  RCU code must take all of
+	the following measures to prevent memory-corruption problems:
 
 	a.	Readers must maintain proper ordering of their memory
 		accesses.  The rcu_dereference() primitive ensures that
@@ -113,14 +116,25 @@ over a rather long period of time, but improvements are always welcome!
 		The rcu_dereference() primitive is also an excellent
 		documentation aid, letting the person reading the code
 		know exactly which pointers are protected by RCU.
-
-		The rcu_dereference() primitive is used by the various
-		"_rcu()" list-traversal primitives, such as the
-		list_for_each_entry_rcu().  Note that it is perfectly
-		legal (if redundant) for update-side code to use
-		rcu_dereference() and the "_rcu()" list-traversal
-		primitives.  This is particularly useful in code
-		that is common to readers and updaters.
+		Please note that compilers can also reorder code, and
+		they are becoming increasingly aggressive about doing
+		just that.  The rcu_dereference() primitive therefore
+		also prevents destructive compiler optimizations.
+
+		The rcu_dereference() primitive is used by the
+		various "_rcu()" list-traversal primitives, such
+		as the list_for_each_entry_rcu().  Note that it is
+		perfectly legal (if redundant) for update-side code to
+		use rcu_dereference() and the "_rcu()" list-traversal
+		primitives.  This is particularly useful in code that
+		is common to readers and updaters.  However, lockdep
+		will complain if you access rcu_dereference() outside
+		of an RCU read-side critical section.  See lockdep.txt
+		to learn what to do about this.
+
+		Of course, neither rcu_dereference() nor the "_rcu()"
+		list-traversal primitives can substitute for a good
+		concurrency design coordinating among multiple updaters.
 
 	b.	If the list macros are being used, the list_add_tail_rcu()
 		and list_add_rcu() primitives must be used in order
@@ -135,11 +149,14 @@ over a rather long period of time, but improvements are always welcome!
 		readers.  Similarly, if the hlist macros are being used,
 		the hlist_del_rcu() primitive is required.
 
-		The list_replace_rcu() primitive may be used to
-		replace an old structure with a new one in an
-		RCU-protected list.
+		The list_replace_rcu() and hlist_replace_rcu() primitives
+		may be used to replace an old structure with a new one
+		in their respective types of RCU-protected lists.
+
+	d.	Rules similar to (4b) and (4c) apply to the "hlist_nulls"
+		type of RCU-protected linked lists.
 
-	d.	Updates must ensure that initialization of a given
+	e.	Updates must ensure that initialization of a given
 		structure happens before pointers to that structure are
 		publicized.  Use the rcu_assign_pointer() primitive
 		when publicizing a pointer to a structure that can
@@ -151,16 +168,31 @@ over a rather long period of time, but improvements are always welcome!
 	it cannot block.
 
 6.	Since synchronize_rcu() can block, it cannot be called from
-	any sort of irq context.  Ditto for synchronize_sched() and
-	synchronize_srcu().
-
-7.	If the updater uses call_rcu(), then the corresponding readers
-	must use rcu_read_lock() and rcu_read_unlock().  If the updater
-	uses call_rcu_bh(), then the corresponding readers must use
-	rcu_read_lock_bh() and rcu_read_unlock_bh().  If the updater
-	uses call_rcu_sched(), then the corresponding readers must
-	disable preemption.  Mixing things up will result in confusion
-	and broken kernels.
+	any sort of irq context.  The same rule applies for
+	synchronize_rcu_bh(), synchronize_sched(), synchronize_srcu(),
+	synchronize_rcu_expedited(), synchronize_rcu_bh_expedited(),
+	synchronize_sched_expedite(), and synchronize_srcu_expedited().
+
+	The expedited forms of these primitives have the same semantics
+	as the non-expedited forms, but expediting is both expensive
+	and unfriendly to real-time workloads.	Use of the expedited
+	primitives should be restricted to rare configuration-change
+	operations that would not normally be undertaken while a real-time
+	workload is running.
+
+7.	If the updater uses call_rcu() or synchronize_rcu(), then the
+	corresponding readers must use rcu_read_lock() and
+	rcu_read_unlock().  If the updater uses call_rcu_bh() or
+	synchronize_rcu_bh(), then the corresponding readers must
+	use rcu_read_lock_bh() and rcu_read_unlock_bh().  If the
+	updater uses call_rcu_sched() or synchronize_sched(), then
+	the corresponding readers must disable preemption, possibly
+	by calling rcu_read_lock_sched() and rcu_read_unlock_sched().
+	If the updater uses synchronize_srcu(), the the corresponding
+	readers must use srcu_read_lock() and srcu_read_unlock(),
+	and with the same srcu_struct.	The rules for the expedited
+	primitives are the same as for their non-expedited counterparts.
+	Mixing things up will result in confusion and broken kernels.
 
 	One exception to this rule: rcu_read_lock() and rcu_read_unlock()
 	may be substituted for rcu_read_lock_bh() and rcu_read_unlock_bh()
@@ -212,6 +244,8 @@ over a rather long period of time, but improvements are always welcome!
 	e.	Periodically invoke synchronize_rcu(), permitting a limited
 		number of updates per grace period.
 
+	The same cautions apply to call_rcu_bh() and call_rcu_sched().
+
 9.	All RCU list-traversal primitives, which include
 	rcu_dereference(), list_for_each_entry_rcu(),
 	list_for_each_continue_rcu(), and list_for_each_safe_rcu(),
@@ -219,17 +253,21 @@ over a rather long period of time, but improvements are always welcome!
 	must be protected by appropriate update-side locks.  RCU
 	read-side critical sections are delimited by rcu_read_lock()
 	and rcu_read_unlock(), or by similar primitives such as
-	rcu_read_lock_bh() and rcu_read_unlock_bh().
+	rcu_read_lock_bh() and rcu_read_unlock_bh(), in which case
+	the matching rcu_dereference() primitive must be used in order
+	to keep lockdep happy, in this case, rcu_dereference_bh().
 
 	The reason that it is permissible to use RCU list-traversal
 	primitives when the update-side lock is held is that doing so
 	can be quite helpful in reducing code bloat when common code is
-	shared between readers and updaters.
+	shared between readers and updaters.  Additional primitives
+	are provided for this case, as discussed in lockdep.txt.
 
 10.	Conversely, if you are in an RCU read-side critical section,
 	and you don't hold the appropriate update-side lock, you -must-
 	use the "_rcu()" variants of the list macros.  Failing to do so
-	will break Alpha and confuse people reading your code.
+	will break Alpha, cause aggressive compilers to generate bad code,
+	and confuse people trying to read your code.
 
 11.	Note that synchronize_rcu() -only- guarantees to wait until
 	all currently executing rcu_read_lock()-protected RCU read-side
@@ -239,15 +277,21 @@ over a rather long period of time, but improvements are always welcome!
 	rcu_read_lock()-protected read-side critical sections, do -not-
 	use synchronize_rcu().
 
-	If you want to wait for some of these other things, you might
-	instead need to use synchronize_irq() or synchronize_sched().
+	Similarly, disabling preemption is not an acceptable substitute
+	for rcu_read_lock().  Code that attempts to use preemption
+	disabling where it should be using rcu_read_lock() will break
+	in real-time kernel builds.
+
+	If you want to wait for interrupt handlers, NMI handlers, and
+	code under the influence of preempt_disable(), you instead
+	need to use synchronize_irq() or synchronize_sched().
 
 12.	Any lock acquired by an RCU callback must be acquired elsewhere
 	with softirq disabled, e.g., via spin_lock_irqsave(),
 	spin_lock_bh(), etc.  Failing to disable irq on a given
-	acquisition of that lock will result in deadlock as soon as the
-	RCU callback happens to interrupt that acquisition's critical
-	section.
+	acquisition of that lock will result in deadlock as soon as
+	the RCU softirq handler happens to run your RCU callback while
+	interrupting that acquisition's critical section.
 
 13.	RCU callbacks can be and are executed in parallel.  In many cases,
 	the callback code simply wrappers around kfree(), so that this
@@ -265,29 +309,30 @@ over a rather long period of time, but improvements are always welcome!
 	not the case, a self-spawning RCU callback would prevent the
 	victim CPU from ever going offline.)
 
-14.	SRCU (srcu_read_lock(), srcu_read_unlock(), and synchronize_srcu())
-	may only be invoked from process context.  Unlike other forms of
-	RCU, it -is- permissible to block in an SRCU read-side critical
-	section (demarked by srcu_read_lock() and srcu_read_unlock()),
-	hence the "SRCU": "sleepable RCU".  Please note that if you
-	don't need to sleep in read-side critical sections, you should
-	be using RCU rather than SRCU, because RCU is almost always
-	faster and easier to use than is SRCU.
+14.	SRCU (srcu_read_lock(), srcu_read_unlock(), srcu_dereference(),
+	synchronize_srcu(), and synchronize_srcu_expedited()) may only
+	be invoked from process context.  Unlike other forms of RCU, it
+	-is- permissible to block in an SRCU read-side critical section
+	(demarked by srcu_read_lock() and srcu_read_unlock()), hence the
+	"SRCU": "sleepable RCU".  Please note that if you don't need
+	to sleep in read-side critical sections, you should be using
+	RCU rather than SRCU, because RCU is almost always faster and
+	easier to use than is SRCU.
 
 	Also unlike other forms of RCU, explicit initialization
 	and cleanup is required via init_srcu_struct() and
 	cleanup_srcu_struct().	These are passed a "struct srcu_struct"
 	that defines the scope of a given SRCU domain.	Once initialized,
 	the srcu_struct is passed to srcu_read_lock(), srcu_read_unlock()
-	and synchronize_srcu().  A given synchronize_srcu() waits only
-	for SRCU read-side critical sections governed by srcu_read_lock()
-	and srcu_read_unlock() calls that have been passd the same
-	srcu_struct.  This property is what makes sleeping read-side
-	critical sections tolerable -- a given subsystem delays only
-	its own updates, not those of other subsystems using SRCU.
-	Therefore, SRCU is less prone to OOM the system than RCU would
-	be if RCU's read-side critical sections were permitted to
-	sleep.
+	synchronize_srcu(), and synchronize_srcu_expedited().  A given
+	synchronize_srcu() waits only for SRCU read-side critical
+	sections governed by srcu_read_lock() and srcu_read_unlock()
+	calls that have been passed the same srcu_struct.  This property
+	is what makes sleeping read-side critical sections tolerable --
+	a given subsystem delays only its own updates, not those of other
+	subsystems using SRCU.	Therefore, SRCU is less prone to OOM the
+	system than RCU would be if RCU's read-side critical sections
+	were permitted to sleep.
 
 	The ability to sleep in read-side critical sections does not
 	come for free.	First, corresponding srcu_read_lock() and
@@ -300,8 +345,8 @@ over a rather long period of time, but improvements are always welcome!
 	requiring SRCU's read-side deadlock immunity or low read-side
 	realtime latency.
 
-	Note that, rcu_assign_pointer() and rcu_dereference() relate to
-	SRCU just as they do to other forms of RCU.
+	Note that, rcu_assign_pointer() relates to SRCU just as they do
+	to other forms of RCU.
 
 15.	The whole point of call_rcu(), synchronize_rcu(), and friends
 	is to wait until all pre-existing readers have finished before
@@ -311,12 +356,12 @@ over a rather long period of time, but improvements are always welcome!
 	destructive operation, and -only- -then- invoke call_rcu(),
 	synchronize_rcu(), or friends.
 
-	Because these primitives only wait for pre-existing readers,
-	it is the caller's responsibility to guarantee safety to
-	any subsequent readers.
+	Because these primitives only wait for pre-existing readers, it
+	is the caller's responsibility to guarantee that any subsequent
+	readers will execute safely.
 
-16.	The various RCU read-side primitives do -not- contain memory
-	barriers.  The CPU (and in some cases, the compiler) is free
-	to reorder code into and out of RCU read-side critical sections.
-	It is the responsibility of the RCU update-side primitives to
-	deal with this.
+16.	The various RCU read-side primitives do -not- necessarily contain
+	memory barriers.  You should therefore plan for the CPU
+	and the compiler to freely reorder code into and out of RCU
+	read-side critical sections.  It is the responsibility of the
+	RCU update-side primitives to deal with this.

Documentation/RCU/lockdep.txt

@@ -0,0 +1,91 @@
+RCU and lockdep checking
+
+All flavors of RCU have lockdep checking available, so that lockdep is
+aware of when each task enters and leaves any flavor of RCU read-side
+critical section.  Each flavor of RCU is tracked separately (but note
+that this is not the case in 2.6.32 and earlier).  This allows lockdep's
+tracking to include RCU state, which can sometimes help when debugging
+deadlocks and the like.
+
+In addition, RCU provides the following primitives that check lockdep's
+state:
+
+	rcu_read_lock_held() for normal RCU.
+	rcu_read_lock_bh_held() for RCU-bh.
+	rcu_read_lock_sched_held() for RCU-sched.
+	srcu_read_lock_held() for SRCU.
+
+These functions are conservative, and will therefore return 1 if they
+aren't certain (for example, if CONFIG_DEBUG_LOCK_ALLOC is not set).
+This prevents things like WARN_ON(!rcu_read_lock_held()) from giving false
+positives when lockdep is disabled.
+
+In addition, a separate kernel config parameter CONFIG_PROVE_RCU enables
+checking of rcu_dereference() primitives:
+
+	rcu_dereference(p):
+		Check for RCU read-side critical section.
+	rcu_dereference_bh(p):
+		Check for RCU-bh read-side critical section.
+	rcu_dereference_sched(p):
+		Check for RCU-sched read-side critical section.
+	srcu_dereference(p, sp):
+		Check for SRCU read-side critical section.
+	rcu_dereference_check(p, c):
+		Use explicit check expression "c".  This is useful in
+		code that is invoked by both readers and updaters.
+	rcu_dereference_raw(p)
+		Don't check.  (Use sparingly, if at all.)
+	rcu_dereference_protected(p, c):
+		Use explicit check expression "c", and omit all barriers
+		and compiler constraints.  This is useful when the data
+		structure cannot change, for example, in code that is
+		invoked only by updaters.
+	rcu_access_pointer(p):
+		Return the value of the pointer and omit all barriers,
+		but retain the compiler constraints that prevent duplicating
+		or coalescsing.  This is useful when when testing the
+		value of the pointer itself, for example, against NULL.
+
+The rcu_dereference_check() check expression can be any boolean
+expression, but would normally include one of the rcu_read_lock_held()
+family of functions and a lockdep expression.  However, any boolean
+expression can be used.  For a moderately ornate example, consider
+the following:
+
+	file = rcu_dereference_check(fdt->fd[fd],
+				     rcu_read_lock_held() ||
+				     lockdep_is_held(&files->file_lock) ||
+				     atomic_read(&files->count) == 1);
+
+This expression picks up the pointer "fdt->fd[fd]" in an RCU-safe manner,
+and, if CONFIG_PROVE_RCU is configured, verifies that this expression
+is used in:
+
+1.	An RCU read-side critical section, or
+2.	with files->file_lock held, or
+3.	on an unshared files_struct.
+
+In case (1), the pointer is picked up in an RCU-safe manner for vanilla
+RCU read-side critical sections, in case (2) the ->file_lock prevents
+any change from taking place, and finally, in case (3) the current task
+is the only task accessing the file_struct, again preventing any change
+from taking place.  If the above statement was invoked only from updater
+code, it could instead be written as follows:
+
+	file = rcu_dereference_protected(fdt->fd[fd],
+					 lockdep_is_held(&files->file_lock) ||
+					 atomic_read(&files->count) == 1);
+
+This would verify cases #2 and #3 above, and furthermore lockdep would
+complain if this was used in an RCU read-side critical section unless one
+of these two cases held.  Because rcu_dereference_protected() omits all
+barriers and compiler constraints, it generates better code than do the
+other flavors of rcu_dereference().  On the other hand, it is illegal
+to use rcu_dereference_protected() if either the RCU-protected pointer
+or the RCU-protected data that it points to can change concurrently.
+
+There are currently only "universal" versions of the rcu_assign_pointer()
+and RCU list-/tree-traversal primitives, which do not (yet) check for
+being in an RCU read-side critical section.  In the future, separate
+versions of these primitives might be created.

Documentation/RCU/rcu.txt

@@ -75,6 +75,8 @@ o	I hear that RCU is patented?  What is with that?
 	search for the string "Patent" in RTFP.txt to find them.
 	Of these, one was allowed to lapse by the assignee, and the
 	others have been contributed to the Linux kernel under GPL.
+	There are now also LGPL implementations of user-level RCU
+	available (http://lttng.org/?q=node/18).
 
 o	I hear that RCU needs work in order to support realtime kernels?
 
@@ -91,48 +93,4 @@ o	Where can I find more information on RCU?
 
 o	What are all these files in this directory?
 
-
-	NMI-RCU.txt
-
-		Describes how to use RCU to implement dynamic
-		NMI handlers, which can be revectored on the fly,
-		without rebooting.
-
-	RTFP.txt
-
-		List of RCU-related publications and web sites.
-
-	UP.txt
-
-		Discussion of RCU usage in UP kernels.
-
-	arrayRCU.txt
-
-		Describes how to use RCU to protect arrays, with
-		resizeable arrays whose elements reference other
-		data structures being of the most interest.
-
-	checklist.txt
-
-		Lists things to check for when inspecting code that
-		uses RCU.
-
-	listRCU.txt
-
-		Describes how to use RCU to protect linked lists.
-		This is the simplest and most common use of RCU
-		in the Linux kernel.
-
-	rcu.txt
-
-		You are reading it!
-
-	rcuref.txt
-
-		Describes how to combine use of reference counts
-		with RCU.
-
-	whatisRCU.txt
-
-		Overview of how the RCU implementation works.  Along
-		the way, presents a conceptual view of RCU.
+	See 00-INDEX for the list.

Documentation/RCU/stallwarn.txt

@@ -0,0 +1,106 @@
+Using RCU's CPU Stall Detector
+
+The CONFIG_RCU_CPU_STALL_DETECTOR kernel config parameter enables
+RCU's CPU stall detector, which detects conditions that unduly delay
+RCU grace periods.  The stall detector's idea of what constitutes
+"unduly delayed" is controlled by a set of C preprocessor macros:
+
+RCU_SECONDS_TILL_STALL_CHECK
+
+	This macro defines the period of time that RCU will wait from
+	the beginning of a grace period until it issues an RCU CPU
+	stall warning.	This time period is normally ten seconds.
+
+RCU_SECONDS_TILL_STALL_RECHECK
+
+	This macro defines the period of time that RCU will wait after
+	issuing a stall warning until it issues another stall warning
+	for the same stall.  This time period is normally set to thirty
+	seconds.
+
+RCU_STALL_RAT_DELAY
+
+	The CPU stall detector tries to make the offending CPU print its
+	own warnings, as this often gives better-quality stack traces.
+	However, if the offending CPU does not detect its own stall in
+	the number of jiffies specified by RCU_STALL_RAT_DELAY, then
+	some other CPU will complain.  This delay is normally set to
+	two jiffies.
+
+When a CPU detects that it is stalling, it will print a message similar
+to the following:
+
+INFO: rcu_sched_state detected stall on CPU 5 (t=2500 jiffies)
+
+This message indicates that CPU 5 detected that it was causing a stall,
+and that the stall was affecting RCU-sched.  This message will normally be
+followed by a stack dump of the offending CPU.  On TREE_RCU kernel builds,
+RCU and RCU-sched are implemented by the same underlying mechanism,
+while on TREE_PREEMPT_RCU kernel builds, RCU is instead implemented
+by rcu_preempt_state.
+
+On the other hand, if the offending CPU fails to print out a stall-warning
+message quickly enough, some other CPU will print a message similar to
+the following:
+
+INFO: rcu_bh_state detected stalls on CPUs/tasks: { 3 5 } (detected by 2, 2502 jiffies)
+
+This message indicates that CPU 2 detected that CPUs 3 and 5 were both
+causing stalls, and that the stall was affecting RCU-bh.  This message
+will normally be followed by stack dumps for each CPU.  Please note that
+TREE_PREEMPT_RCU builds can be stalled by tasks as well as by CPUs,
+and that the tasks will be indicated by PID, for example, "P3421".
+It is even possible for a rcu_preempt_state stall to be caused by both
+CPUs -and- tasks, in which case the offending CPUs and tasks will all
+be called out in the list.
+
+Finally, if the grace period ends just as the stall warning starts
+printing, there will be a spurious stall-warning message:
+
+INFO: rcu_bh_state detected stalls on CPUs/tasks: { } (detected by 4, 2502 jiffies)
+
+This is rare, but does happen from time to time in real life.
+
+So your kernel printed an RCU CPU stall warning.  The next question is
+"What caused it?"  The following problems can result in RCU CPU stall
+warnings:
+
+o	A CPU looping in an RCU read-side critical section.
+	
+o	A CPU looping with interrupts disabled.  This condition can
+	result in RCU-sched and RCU-bh stalls.
+
+o	A CPU looping with preemption disabled.  This condition can
+	result in RCU-sched stalls and, if ksoftirqd is in use, RCU-bh
+	stalls.
+
+o	A CPU looping with bottom halves disabled.  This condition can
+	result in RCU-sched and RCU-bh stalls.
+
+o	For !CONFIG_PREEMPT kernels, a CPU looping anywhere in the kernel
+	without invoking schedule().
+
+o	A bug in the RCU implementation.
+
+o	A hardware failure.  This is quite unlikely, but has occurred
+	at least once in real life.  A CPU failed in a running system,
+	becoming unresponsive, but not causing an immediate crash.
+	This resulted in a series of RCU CPU stall warnings, eventually
+	leading the realization that the CPU had failed.
+
+The RCU, RCU-sched, and RCU-bh implementations have CPU stall
+warning.  SRCU does not have its own CPU stall warnings, but its
+calls to synchronize_sched() will result in RCU-sched detecting
+RCU-sched-related CPU stalls.  Please note that RCU only detects
+CPU stalls when there is a grace period in progress.  No grace period,
+no CPU stall warnings.
+
+To diagnose the cause of the stall, inspect the stack traces.
+The offending function will usually be near the top of the stack.
+If you have a series of stall warnings from a single extended stall,
+comparing the stack traces can often help determine where the stall
+is occurring, which will usually be in the function nearest the top of
+that portion of the stack which remains the same from trace to trace.
+If you can reliably trigger the stall, ftrace can be quite helpful.
+
+RCU bugs can often be debugged with the help of CONFIG_RCU_TRACE.

Documentation/RCU/torture.txt

@@ -30,6 +30,18 @@ MODULE PARAMETERS
 
 This module has the following parameters:
 
+fqs_duration	Duration (in microseconds) of artificially induced bursts
+		of force_quiescent_state() invocations.  In RCU
+		implementations having force_quiescent_state(), these
+		bursts help force races between forcing a given grace
+		period and that grace period ending on its own.
+
+fqs_holdoff	Holdoff time (in microseconds) between consecutive calls
+		to force_quiescent_state() within a burst.
+
+fqs_stutter	Wait time (in seconds) between consecutive bursts
+		of calls to force_quiescent_state().
+
 irqreaders	Says to invoke RCU readers from irq level.  This is currently
 		done via timers.  Defaults to "1" for variants of RCU that
 		permit this.  (Or, more accurately, variants of RCU that do
@@ -170,16 +182,6 @@ Similarly, sched_expedited RCU provides the following:
 	sched_expedited-torture: Reader Pipe:  12660320201 95875 0 0 0 0 0 0 0 0 0
 	sched_expedited-torture: Reader Batch:  12660424885 0 0 0 0 0 0 0 0 0 0
 	sched_expedited-torture: Free-Block Circulation:  1090795 1090795 1090794 1090793 1090792 1090791 1090790 1090789 1090788 1090787 0
-	state: -1 / 0:0 3:0 4:0
-
-As before, the first four lines are similar to those for RCU.
-The last line shows the task-migration state.  The first number is
--1 if synchronize_sched_expedited() is idle, -2 if in the process of
-posting wakeups to the migration kthreads, and N when waiting on CPU N.
-Each of the colon-separated fields following the "/" is a CPU:state pair.
-Valid states are "0" for idle, "1" for waiting for quiescent state,
-"2" for passed through quiescent state, and "3" when a race with a
-CPU-hotplug event forces use of the synchronize_sched() primitive.
 
 
 USAGE

Documentation/RCU/trace.txt

@@ -256,23 +256,23 @@ o	Each element of the form "1/1 0:127 ^0" represents one struct
 The output of "cat rcu/rcu_pending" looks as follows:
 
 rcu_sched:
-  0 np=255892 qsp=53936 cbr=0 cng=14417 gpc=10033 gps=24320 nf=6445 nn=146741
-  1 np=261224 qsp=54638 cbr=0 cng=25723 gpc=16310 gps=2849 nf=5912 nn=155792
-  2 np=237496 qsp=49664 cbr=0 cng=2762 gpc=45478 gps=1762 nf=1201 nn=136629
-  3 np=236249 qsp=48766 cbr=0 cng=286 gpc=48049 gps=1218 nf=207 nn=137723
-  4 np=221310 qsp=46850 cbr=0 cng=26 gpc=43161 gps=4634 nf=3529 nn=123110
-  5 np=237332 qsp=48449 cbr=0 cng=54 gpc=47920 gps=3252 nf=201 nn=137456
-  6 np=219995 qsp=46718 cbr=0 cng=50 gpc=42098 gps=6093 nf=4202 nn=120834
-  7 np=249893 qsp=49390 cbr=0 cng=72 gpc=38400 gps=17102 nf=41 nn=144888
+  0 np=255892 qsp=53936 rpq=85 cbr=0 cng=14417 gpc=10033 gps=24320 nf=6445 nn=146741
+  1 np=261224 qsp=54638 rpq=33 cbr=0 cng=25723 gpc=16310 gps=2849 nf=5912 nn=155792
+  2 np=237496 qsp=49664 rpq=23 cbr=0 cng=2762 gpc=45478 gps=1762 nf=1201 nn=136629
+  3 np=236249 qsp=48766 rpq=98 cbr=0 cng=286 gpc=48049 gps=1218 nf=207 nn=137723
+  4 np=221310 qsp=46850 rpq=7 cbr=0 cng=26 gpc=43161 gps=4634 nf=3529 nn=123110
+  5 np=237332 qsp=48449 rpq=9 cbr=0 cng=54 gpc=47920 gps=3252 nf=201 nn=137456
+  6 np=219995 qsp=46718 rpq=12 cbr=0 cng=50 gpc=42098 gps=6093 nf=4202 nn=120834
+  7 np=249893 qsp=49390 rpq=42 cbr=0 cng=72 gpc=38400 gps=17102 nf=41 nn=144888
 rcu_bh:
-  0 np=146741 qsp=1419 cbr=0 cng=6 gpc=0 gps=0 nf=2 nn=145314
-  1 np=155792 qsp=12597 cbr=0 cng=0 gpc=4 gps=8 nf=3 nn=143180
-  2 np=136629 qsp=18680 cbr=0 cng=0 gpc=7 gps=6 nf=0 nn=117936
-  3 np=137723 qsp=2843 cbr=0 cng=0 gpc=10 gps=7 nf=0 nn=134863
-  4 np=123110 qsp=12433 cbr=0 cng=0 gpc=4 gps=2 nf=0 nn=110671
-  5 np=137456 qsp=4210 cbr=0 cng=0 gpc=6 gps=5 nf=0 nn=133235
-  6 np=120834 qsp=9902 cbr=0 cng=0 gpc=6 gps=3 nf=2 nn=110921
-  7 np=144888 qsp=26336 cbr=0 cng=0 gpc=8 gps=2 nf=0 nn=118542
+  0 np=146741 qsp=1419 rpq=6 cbr=0 cng=6 gpc=0 gps=0 nf=2 nn=145314
+  1 np=155792 qsp=12597 rpq=3 cbr=0 cng=0 gpc=4 gps=8 nf=3 nn=143180
+  2 np=136629 qsp=18680 rpq=1 cbr=0 cng=0 gpc=7 gps=6 nf=0 nn=117936
+  3 np=137723 qsp=2843 rpq=0 cbr=0 cng=0 gpc=10 gps=7 nf=0 nn=134863
+  4 np=123110 qsp=12433 rpq=0 cbr=0 cng=0 gpc=4 gps=2 nf=0 nn=110671
+  5 np=137456 qsp=4210 rpq=1 cbr=0 cng=0 gpc=6 gps=5 nf=0 nn=133235
+  6 np=120834 qsp=9902 rpq=2 cbr=0 cng=0 gpc=6 gps=3 nf=2 nn=110921
+  7 np=144888 qsp=26336 rpq=0 cbr=0 cng=0 gpc=8 gps=2 nf=0 nn=118542
 
 As always, this is once again split into "rcu_sched" and "rcu_bh"
 portions, with CONFIG_TREE_PREEMPT_RCU kernels having an additional
@@ -284,6 +284,9 @@ o	"np" is the number of times that __rcu_pending() has been invoked
 o	"qsp" is the number of times that the RCU was waiting for a
 	quiescent state from this CPU.
 
+o	"rpq" is the number of times that the CPU had passed through
+	a quiescent state, but not yet reported it to RCU.
+
 o	"cbr" is the number of times that this CPU had RCU callbacks
 	that had passed through a grace period, and were thus ready
 	to be invoked.

Documentation/RCU/whatisRCU.txt

@@ -323,14 +323,17 @@ used as follows:
 	Defer			Protect
 
 a.	synchronize_rcu()	rcu_read_lock() / rcu_read_unlock()
-	call_rcu()
+	call_rcu()		rcu_dereference()
 
 b.	call_rcu_bh()		rcu_read_lock_bh() / rcu_read_unlock_bh()
+				rcu_dereference_bh()
 
-c.	synchronize_sched()	preempt_disable() / preempt_enable()
+c.	synchronize_sched()	rcu_read_lock_sched() / rcu_read_unlock_sched()
+				preempt_disable() / preempt_enable()
 				local_irq_save() / local_irq_restore()
 				hardirq enter / hardirq exit
 				NMI enter / NMI exit
+				rcu_dereference_sched()
 
 These three mechanisms are used as follows:
 
@@ -780,9 +783,8 @@ Linux-kernel source code, but it helps to have a full list of the
 APIs, since there does not appear to be a way to categorize them
 in docbook.  Here is the list, by category.
 
-RCU pointer/list traversal:
+RCU list traversal:
 
-	rcu_dereference
 	list_for_each_entry_rcu
 	hlist_for_each_entry_rcu
 	hlist_nulls_for_each_entry_rcu
@@ -808,7 +810,7 @@ RCU:	Critical sections	Grace period		Barrier
 
 	rcu_read_lock		synchronize_net		rcu_barrier
 	rcu_read_unlock		synchronize_rcu
-				synchronize_rcu_expedited
+	rcu_dereference		synchronize_rcu_expedited
 				call_rcu
 
 
@@ -816,7 +818,7 @@ bh:	Critical sections	Grace period		Barrier
 
 	rcu_read_lock_bh	call_rcu_bh		rcu_barrier_bh
 	rcu_read_unlock_bh	synchronize_rcu_bh
-				synchronize_rcu_bh_expedited
+	rcu_dereference_bh	synchronize_rcu_bh_expedited
 
 
 sched:	Critical sections	Grace period		Barrier
@@ -825,17 +827,25 @@ sched:	Critical sections	Grace period		Barrier
 	rcu_read_unlock_sched	call_rcu_sched
 	[preempt_disable]	synchronize_sched_expedited
 	[and friends]
+	rcu_dereference_sched
 
 
 SRCU:	Critical sections	Grace period		Barrier
 
 	srcu_read_lock		synchronize_srcu	N/A
 	srcu_read_unlock	synchronize_srcu_expedited
+	srcu_dereference
 
 SRCU:	Initialization/cleanup
 	init_srcu_struct
 	cleanup_srcu_struct
 
+All:  lockdep-checked RCU-protected pointer access
+
+	rcu_dereference_check
+	rcu_dereference_protected
+	rcu_access_pointer
+
 See the comment headers in the source code (or the docbook generated
 from them) for more information.
 

Documentation/Smack.txt

@@ -73,7 +73,7 @@ NOTE: Smack labels are limited to 23 characters. The attr command
 If you don't do anything special all users will get the floor ("_")
 label when they log in. If you do want to log in via the hacked ssh
 at other labels use the attr command to set the smack value on the
-home directory and it's contents.
+home directory and its contents.
 
 You can add access rules in /etc/smack/accesses. They take the form:
 

Documentation/SubmitChecklist

@@ -9,10 +9,16 @@ Documentation/SubmittingPatches and elsewhere regarding submitting Linux
 kernel patches.
 
 
-1: Builds cleanly with applicable or modified CONFIG options =y, =m, and
+1: If you use a facility then #include the file that defines/declares
+   that facility.  Don't depend on other header files pulling in ones
+   that you use.
+
+2: Builds cleanly with applicable or modified CONFIG options =y, =m, and
    =n.  No gcc warnings/errors, no linker warnings/errors.
 
-2: Passes allnoconfig, allmodconfig
+2b: Passes allnoconfig, allmodconfig
+
+2c: Builds successfully when using O=builddir
 
 3: Builds on multiple CPU architectures by using local cross-compile tools
    or some other build farm.
@@ -91,3 +97,13 @@ kernel patches.
 
 25: If any ioctl's are added by the patch, then also update
     Documentation/ioctl/ioctl-number.txt.
+
+26: If your modified source code depends on or uses any of the kernel
+    APIs or features that are related to the following kconfig symbols,
+    then test multiple builds with the related kconfig symbols disabled
+    and/or =m (if that option is available) [not all of these at the
+    same time, just various/random combinations of them]:
+
+    CONFIG_SMP, CONFIG_SYSFS, CONFIG_PROC_FS, CONFIG_INPUT, CONFIG_PCI,
+    CONFIG_BLOCK, CONFIG_PM, CONFIG_HOTPLUG, CONFIG_MAGIC_SYSRQ,
+    CONFIG_NET, CONFIG_INET=n (but latter with CONFIG_NET=y)

Documentation/SubmittingDrivers

@@ -130,6 +130,8 @@ Linux kernel master tree:
 	ftp.??.kernel.org:/pub/linux/kernel/...
 	?? == your country code, such as "us", "uk", "fr", etc.
 
+	http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git
+
 Linux kernel mailing list:
 	linux-kernel@vger.kernel.org
 	[mail majordomo@vger.kernel.org to subscribe]
@@ -159,4 +161,7 @@ How to NOT write kernel driver by Arjan van de Ven:
 	http://www.fenrus.org/how-to-not-write-a-device-driver-paper.pdf
 
 Kernel Janitor:
-	http://janitor.kernelnewbies.org/
+	http://kernelnewbies.org/KernelJanitors
+
+GIT, Fast Version Control System:
+	http://git-scm.com/

Documentation/SubmittingPatches

@@ -98,6 +98,17 @@ system, git, as a "commit log".  See #15, below.
 If your description starts to get long, that's a sign that you probably
 need to split up your patch.  See #3, next.
 
+When you submit or resubmit a patch or patch series, include the
+complete patch description and justification for it.  Don't just
+say that this is version N of the patch (series).  Don't expect the
+patch merger to refer back to earlier patch versions or referenced
+URLs to find the patch description and put that into the patch.
+I.e., the patch (series) and its description should be self-contained.
+This benefits both the patch merger(s) and reviewers.  Some reviewers
+probably didn't even receive earlier versions of the patch.
+
+If the patch fixes a logged bug entry, refer to that bug entry by
+number and URL.
 
 
 3) Separate your changes.

Documentation/acpi/apei/einj.txt

@@ -0,0 +1,59 @@
+			APEI Error INJection
+			~~~~~~~~~~~~~~~~~~~~
+
+EINJ provides a hardware error injection mechanism
+It is very useful for debugging and testing of other APEI and RAS features.
+
+To use EINJ, make sure the following are enabled in your kernel
+configuration:
+
+CONFIG_DEBUG_FS
+CONFIG_ACPI_APEI
+CONFIG_ACPI_APEI_EINJ
+
+The user interface of EINJ is debug file system, under the
+directory apei/einj. The following files are provided.
+
+- available_error_type
+  Reading this file returns the error injection capability of the
+  platform, that is, which error types are supported. The error type
+  definition is as follow, the left field is the error type value, the
+  right field is error description.
+
+    0x00000001	Processor Correctable
+    0x00000002	Processor Uncorrectable non-fatal
+    0x00000004	Processor Uncorrectable fatal
+    0x00000008  Memory Correctable
+    0x00000010  Memory Uncorrectable non-fatal
+    0x00000020  Memory Uncorrectable fatal
+    0x00000040	PCI Express Correctable
+    0x00000080	PCI Express Uncorrectable fatal
+    0x00000100	PCI Express Uncorrectable non-fatal
+    0x00000200	Platform Correctable
+    0x00000400	Platform Uncorrectable non-fatal
+    0x00000800	Platform Uncorrectable fatal
+
+  The format of file contents are as above, except there are only the
+  available error type lines.
+
+- error_type
+  This file is used to set the error type value. The error type value
+  is defined in "available_error_type" description.
+
+- error_inject
+  Write any integer to this file to trigger the error
+  injection. Before this, please specify all necessary error
+  parameters.
+
+- param1
+  This file is used to set the first error parameter value. Effect of
+  parameter depends on error_type specified. For memory error, this is
+  physical memory address.
+
+- param2
+  This file is used to set the second error parameter value. Effect of
+  parameter depends on error_type specified. For memory error, this is
+  physical memory address mask.
+
+For more information about EINJ, please refer to ACPI specification
+version 4.0, section 17.5.

Documentation/acpi/method-customizing.txt

@@ -19,6 +19,8 @@ Note: Only ACPI METHOD can be overridden, any other object types like
       "Device", "OperationRegion", are not recognized.
 Note: The same ACPI control method can be overridden for many times,
       and it's always the latest one that used by Linux/kernel.
+Note: To get the ACPI debug object output (Store (AAAA, Debug)),
+      please run "echo 1 > /sys/module/acpi/parameters/aml_debug_output".
 
 1. override an existing method
    a) get the ACPI table via ACPI sysfs I/F. e.g. to get the DSDT,

Documentation/aoe/aoe.txt

@@ -1,6 +1,6 @@
 The EtherDrive (R) HOWTO for users of 2.6 kernels is found at ...
 
-  http://www.coraid.com/support/linux/EtherDrive-2.6-HOWTO.html
+  http://www.coraid.com/SUPPORT/EtherDrive-HBA  
 
   It has many tips and hints!
 

Documentation/apparmor.txt

@@ -0,0 +1,39 @@
+--- What is AppArmor? ---
+
+AppArmor is MAC style security extension for the Linux kernel.  It implements
+a task centered policy, with task "profiles" being created and loaded
+from user space.  Tasks on the system that do not have a profile defined for
+them run in an unconfined state which is equivalent to standard Linux DAC
+permissions.
+
+--- How to enable/disable ---
+
+set CONFIG_SECURITY_APPARMOR=y
+
+If AppArmor should be selected as the default security module then
+   set CONFIG_DEFAULT_SECURITY="apparmor"
+   and CONFIG_SECURITY_APPARMOR_BOOTPARAM_VALUE=1
+
+Build the kernel
+
+If AppArmor is not the default security module it can be enabled by passing
+security=apparmor on the kernel's command line.
+
+If AppArmor is the default security module it can be disabled by passing
+apparmor=0, security=XXXX (where XXX is valid security module), on the
+kernel's command line
+
+For AppArmor to enforce any restrictions beyond standard Linux DAC permissions
+policy must be loaded into the kernel from user space (see the Documentation
+and tools links).
+
+--- Documentation ---
+
+Documentation can be found on the wiki.
+
+--- Links ---
+
+Mailing List - apparmor@lists.ubuntu.com
+Wiki - http://apparmor.wiki.kernel.org/
+User space tools - https://launchpad.net/apparmor
+Kernel module - git://git.kernel.org/pub/scm/linux/kernel/git/jj/apparmor-dev.git

Documentation/arm/00-INDEX

@@ -20,6 +20,8 @@ Samsung-S3C24XX
 	- S3C24XX ARM Linux Overview
 Sharp-LH
 	- Linux on Sharp LH79524 and LH7A40X System On a Chip (SOC)
+SPEAr
+	- ST SPEAr platform Linux Overview
 VFP/
 	- Release notes for Linux Kernel Vector Floating Point support code
 empeg/