Merge with master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6.git

Documentation/aoe/aoe.txt

@@ -4,6 +4,16 @@ The EtherDrive (R) HOWTO for users of 2.6 kernels is found at ...
 
   It has many tips and hints!
 
+The aoetools are userland programs that are designed to work with this
+driver.  The aoetools are on sourceforge.
+
+  http://aoetools.sourceforge.net/
+
+The scripts in this Documentation/aoe directory are intended to
+document the use of the driver and are not necessary if you install
+the aoetools.
+
+
 CREATING DEVICE NODES
 
   Users of udev should find the block device nodes created
@@ -35,14 +45,15 @@ USING DEVICE NODES
 
   "echo eth2 eth4 > /dev/etherd/interfaces" tells the aoe driver to
   limit ATA over Ethernet traffic to eth2 and eth4.  AoE traffic from
-  untrusted networks should be ignored as a matter of security.
+  untrusted networks should be ignored as a matter of security.  See
+  also the aoe_iflist driver option described below.
 
   "echo > /dev/etherd/discover" tells the driver to find out what AoE
   devices are available.
 
   These character devices may disappear and be replaced by sysfs
-  counterparts, so distribution maintainers are encouraged to create
-  scripts that use these devices.
+  counterparts.  Using the commands in aoetools insulates users from
+  these implementation details.
 
   The block devices are named like this:
 
@@ -66,7 +77,8 @@ USING SYSFS
   through which we are communicating with the remote AoE device.
 
   There is a script in this directory that formats this information
-  in a convenient way.
+  in a convenient way.  Users with aoetools can use the aoe-stat
+  command.
 
   root@makki root# sh Documentation/aoe/status.sh 
      e10.0            eth3              up
@@ -89,3 +101,23 @@ USING SYSFS
       e4.7            eth1              up
       e4.8            eth1              up
       e4.9            eth1              up
+
+  Use /sys/module/aoe/parameters/aoe_iflist (or better, the driver
+  option discussed below) instead of /dev/etherd/interfaces to limit
+  AoE traffic to the network interfaces in the given
+  whitespace-separated list.  Unlike the old character device, the
+  sysfs entry can be read from as well as written to.
+
+  It's helpful to trigger discovery after setting the list of allowed
+  interfaces.  The aoetools package provides an aoe-discover script
+  for this purpose.  You can also directly use the
+  /dev/etherd/discover special file described above.
+
+DRIVER OPTIONS
+
+  There is a boot option for the built-in aoe driver and a
+  corresponding module parameter, aoe_iflist.  Without this option,
+  all network interfaces may be used for ATA over Ethernet.  Here is a
+  usage example for the module parameter.
+
+    modprobe aoe_iflist="eth1 eth3"

Documentation/aoe/status.sh

@@ -14,10 +14,6 @@ test ! -d "$sysd/block" && {
 	echo "$me Error: sysfs is not mounted" 1>&2
 	exit 1
 }
-test -z "`lsmod | grep '^aoe'`" && {
-	echo  "$me Error: aoe module is not loaded" 1>&2
-	exit 1
-}
 
 for d in `ls -d $sysd/block/etherd* 2>/dev/null | grep -v p` end; do
 	# maybe ls comes up empty, so we use "end"

Documentation/pci.txt

@@ -279,6 +279,7 @@ pci_for_each_dev_reverse()	Superseded by pci_find_device_reverse()
 pci_for_each_bus()		Superseded by pci_find_next_bus()
 pci_find_device()		Superseded by pci_get_device()
 pci_find_subsys()		Superseded by pci_get_subsys()
+pci_find_slot()			Superseded by pci_get_slot()
 pcibios_find_class()		Superseded by pci_get_class()
 pci_find_class()		Superseded by pci_get_class()
 pci_(read|write)_*_nodev()	Superseded by pci_bus_(read|write)_*()

Documentation/power/pci.txt

@@ -165,40 +165,9 @@ Description:
 These functions are intended for use by individual drivers, and are defined in 
 struct pci_driver:
 
-        int  (*save_state) (struct pci_dev *dev, u32 state);
-        int  (*suspend) (struct pci_dev *dev, u32 state);
+        int  (*suspend) (struct pci_dev *dev, pm_message_t state);
         int  (*resume) (struct pci_dev *dev);
-        int  (*enable_wake) (struct pci_dev *dev, u32 state, int enable);
-
-
-save_state
-----------
-
-Usage:
-
-if (dev->driver && dev->driver->save_state)
-	dev->driver->save_state(dev,state);
-
-The driver should use this callback to save device state. It should take into
-account the current state of the device and the requested state in order to
-avoid any unnecessary operations.
-
-For example, a video card that supports all 4 states (D0-D3), all controller
-context is preserved when entering D1, but the screen is placed into a low power
-state (blanked). 
-
-The driver can also interpret this function as a notification that it may be
-entering a sleep state in the near future. If it knows that the device cannot
-enter the requested state, either because of lack of support for it, or because
-the device is middle of some critical operation, then it should fail.
-
-This function should not be used to set any state in the device or the driver
-because the device may not actually enter the sleep state (e.g. another driver
-later causes causes a global state transition to fail).
-
-Note that in intermediate low power states, a device's I/O and memory spaces may
-be disabled and may not be available in subsequent transitions to lower power
-states.
+        int  (*enable_wake) (struct pci_dev *dev, pci_power_t state, int enable);
 
 
 suspend

arch/alpha/Kconfig

@@ -280,6 +280,10 @@ config ISA
 	  (MCA) or VESA.  ISA is an older system, now being displaced by PCI;
 	  newer boards don't support it.  If you have ISA, say Y, otherwise N.
 
+config ISA_DMA_API
+	bool
+	default y
+
 config PCI
 	bool
 	depends on !ALPHA_JENSEN

arch/arm/Kconfig

@@ -266,6 +266,10 @@ config ISA_DMA
 	depends on FOOTBRIDGE_HOST || ARCH_SHARK
 	default y
 
+config ISA_DMA_API
+	bool
+	default y
+
 config PCI
 	bool "PCI support" if ARCH_INTEGRATOR_AP
 	default y if ARCH_SHARK || FOOTBRIDGE_HOST || ARCH_IOP3XX || ARCH_IXP4XX || ARCH_IXP2000

arch/arm/boot/compressed/head.S

@@ -18,48 +18,30 @@
  * Please select one of the following when turning on debugging.
  */
 #ifdef DEBUG
-#if defined(CONFIG_DEBUG_DC21285_PORT)
-		.macro	loadsp, rb
-		mov	\rb, #0x42000000
-		.endm
-		.macro	writeb, rb
-		str	\rb, [r3, #0x160]
-		.endm
-#elif defined(CONFIG_DEBUG_ICEDCC)
+
+#include <asm/arch/debug-macro.S>
+
+#if defined(CONFIG_DEBUG_ICEDCC)
 		.macro	loadsp, rb
 		.endm
-		.macro writeb, rb
-		mcr	p14, 0, \rb, c0, c1, 0
-		.endm
-#elif defined(CONFIG_FOOTBRIDGE)
-		.macro	loadsp,	rb
-		mov	\rb, #0x7c000000
+		.macro writeb, ch, rb
+		mcr	p14, 0, \ch, c0, c1, 0
 		.endm
-		.macro	writeb,	rb
-		strb	\rb, [r3, #0x3f8]
+#else
+		.macro	writeb,	ch, rb
+		senduart \ch, \rb
 		.endm
-#elif defined(CONFIG_ARCH_RPC)
+
+#if defined(CONFIG_FOOTBRIDGE) || \
+    defined(CONFIG_ARCH_RPC) || \
+    defined(CONFIG_ARCH_INTEGRATOR) || \
+    defined(CONFIG_ARCH_PXA) || \
+    defined(CONFIG_ARCH_IXP4XX) || \
+    defined(CONFIG_ARCH_IXP2000) || \
+    defined(CONFIG_ARCH_LH7A40X) || \
+    defined(CONFIG_ARCH_OMAP)
 		.macro	loadsp,	rb
-		mov	\rb, #0x03000000
-		orr	\rb, \rb, #0x00010000
-		.endm
-		.macro	writeb,	rb
-		strb	\rb, [r3, #0x3f8 << 2]
-		.endm
-#elif defined(CONFIG_ARCH_INTEGRATOR)
-		.macro	loadsp, rb
-		mov	\rb, #0x16000000
-		.endm
-		.macro	writeb, rb
-		strb	\rb, [r3, #0]
-		.endm
-#elif defined(CONFIG_ARCH_PXA) /* Xscale-type */
-		.macro 	loadsp, rb
-		mov	\rb, #0x40000000
-		orr	\rb, \rb, #0x00100000
-		.endm
-		.macro	writeb, rb
-		strb	\rb, [r3, #0]
+		addruart \rb
 		.endm
 #elif defined(CONFIG_ARCH_SA1100)
 		.macro	loadsp, rb
@@ -70,64 +52,21 @@
 		add	\rb, \rb, #0x00010000	@ Ser1
 #  endif
 		.endm
-		.macro	writeb, rb
-		str	\rb, [r3, #0x14]	@ UTDR
-		.endm
-#elif defined(CONFIG_ARCH_IXP4XX)
-		.macro	loadsp, rb
-		mov	\rb, #0xc8000000
-		.endm
-		.macro	writeb, rb
-		str	\rb, [r3, #0]
-#elif defined(CONFIG_ARCH_IXP2000)
-		.macro	loadsp, rb
-		mov	\rb, #0xc0000000
-		orr	\rb, \rb, #0x00030000
-		.endm
-		.macro	writeb, rb
-		str	\rb, [r3, #0]
-		.endm
-#elif defined(CONFIG_ARCH_LH7A40X)
-		.macro	loadsp, rb
-		ldr	\rb, =0x80000700	@ UART2 UARTBASE
-		.endm
-		.macro	writeb, rb
-		strb	\rb, [r3, #0]
-		.endm
-#elif defined(CONFIG_ARCH_OMAP)
-		.macro  loadsp, rb
-		mov	\rb, #0xff000000	@ physical base address
-		add	\rb, \rb, #0x00fb0000
-#if defined(CONFIG_OMAP_LL_DEBUG_UART2) || defined(CONFIG_OMAP_LL_DEBUG_UART3)
-		add	\rb, \rb, #0x00000800
-#endif
-#ifdef CONFIG_OMAP_LL_DEBUG_UART3
-		add	\rb, \rb, #0x00009000
-#endif
-		.endm
-		.macro	writeb, rb
-		strb	\rb, [r3]
-		.endm
 #elif defined(CONFIG_ARCH_IOP331)
 		.macro loadsp, rb
                 mov   	\rb, #0xff000000
                 orr     \rb, \rb, #0x00ff0000
                 orr     \rb, \rb, #0x0000f700   @ location of the UART
 		.endm
-		.macro	writeb, rb
-		str	\rb, [r3, #0]
-		.endm
 #elif defined(CONFIG_ARCH_S3C2410)
-			.macro loadsp, rb
+		.macro loadsp, rb
 		mov	\rb, #0x50000000
 		add	\rb, \rb, #0x4000 * CONFIG_S3C2410_LOWLEVEL_UART_PORT
 		.endm
-		.macro	writeb, rb
-		strb	\rb, [r3, #0x20]
-		.endm
 #else
 #error no serial architecture defined
 #endif
+#endif
 #endif
 
 		.macro	kputc,val
@@ -734,7 +673,7 @@ puts:		loadsp	r3
 1:		ldrb	r2, [r0], #1
 		teq	r2, #0
 		moveq	pc, lr
-2:		writeb	r2
+2:		writeb	r2, r3
 		mov	r1, #0x00020000
 3:		subs	r1, r1, #1
 		bne	3b

arch/arm/mach-imx/generic.c

@@ -26,6 +26,7 @@
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <asm/arch/imxfb.h>
 #include <asm/hardware.h>
 
 #include <asm/mach/map.h>
@@ -228,6 +229,14 @@ static struct platform_device imx_uart2_device = {
 	.resource	= imx_uart2_resources,
 };
 
+static struct imxfb_mach_info imx_fb_info;
+
+void __init set_imx_fb_info(struct imxfb_mach_info *hard_imx_fb_info)
+{
+	memcpy(&imx_fb_info,hard_imx_fb_info,sizeof(struct imxfb_mach_info));
+}
+EXPORT_SYMBOL(set_imx_fb_info);
+
 static struct resource imxfb_resources[] = {
 	[0] = {
 		.start	= 0x00205000,
@@ -241,9 +250,16 @@ static struct resource imxfb_resources[] = {
 	},
 };
 
+static u64 fb_dma_mask = ~(u64)0;
+
 static struct platform_device imxfb_device = {
 	.name		= "imx-fb",
 	.id		= 0,
+	.dev		= {
+ 		.platform_data	= &imx_fb_info,
+		.dma_mask	= &fb_dma_mask,
+		.coherent_dma_mask = 0xffffffff,
+	},
 	.num_resources	= ARRAY_SIZE(imxfb_resources),
 	.resource	= imxfb_resources,
 };

arch/arm/mach-integrator/core.c

@@ -216,7 +216,9 @@ integrator_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 
 	write_seqlock(&xtime_lock);
 
-	// ...clear the interrupt
+	/*
+	 * clear the interrupt
+	 */
 	timer1->TimerClear = 1;
 
 	timer_tick(regs);
@@ -264,7 +266,7 @@ void __init integrator_time_init(unsigned long reload, unsigned int ctrl)
 	timer1->TimerValue   = timer_reload;
 	timer1->TimerControl = timer_ctrl;
 
-	/* 
+	/*
 	 * Make irqs happen for the system timer
 	 */
 	setup_irq(IRQ_TIMERINT1, &integrator_timer_irq);

arch/arm/mach-integrator/leds.c

@@ -37,7 +37,7 @@ static void integrator_leds_event(led_event_t ledevt)
 	unsigned long flags;
 	const unsigned int dbg_base = IO_ADDRESS(INTEGRATOR_DBG_BASE);
 	unsigned int update_alpha_leds;
-	
+
 	// yup, change the LEDs
 	local_irq_save(flags);
 	update_alpha_leds = 0;

arch/arm/mach-ixp4xx/common-pci.c

@@ -501,15 +501,6 @@ pci_set_dma_mask(struct pci_dev *dev, u64 mask)
 	return -EIO;
 }
     
-int
-pci_dac_set_dma_mask(struct pci_dev *dev, u64 mask)
-{
-	if (mask >= SZ_64M - 1 )
-		return 0;
-
-	return -EIO;
-}
-
 int
 pci_set_consistent_dma_mask(struct pci_dev *dev, u64 mask)
 {
@@ -520,7 +511,6 @@ pci_set_consistent_dma_mask(struct pci_dev *dev, u64 mask)
 }
 
 EXPORT_SYMBOL(pci_set_dma_mask);
-EXPORT_SYMBOL(pci_dac_set_dma_mask);
 EXPORT_SYMBOL(pci_set_consistent_dma_mask);
 EXPORT_SYMBOL(ixp4xx_pci_read);
 EXPORT_SYMBOL(ixp4xx_pci_write);

arch/arm/mm/Kconfig

@@ -413,6 +413,7 @@ config CPU_BPREDICT_DISABLE
 config HAS_TLS_REG
 	bool
 	depends on CPU_32v6 && !CPU_32v5 && !CPU_32v4 && !CPU_32v3
+	default y
 	help
 	  This selects support for the CP15 thread register.
 	  It is defined to be available on ARMv6 or later.  However

arch/arm26/Kconfig

@@ -89,6 +89,10 @@ config PAGESIZE_16
           machine with 4MB of memory.
 endmenu
 
+config ISA_DMA_API
+	bool
+	default y
+
 menu "General setup"
 
 # Compressed boot loader in ROM.  Yes, we really want to ask about

arch/i386/Kconfig

@@ -1173,6 +1173,10 @@ source "drivers/pci/pcie/Kconfig"
 
 source "drivers/pci/Kconfig"
 
+config ISA_DMA_API
+	bool
+	default y
+
 config ISA
 	bool "ISA support"
 	depends on !(X86_VOYAGER || X86_VISWS)

arch/ia64/Kconfig

@@ -217,6 +217,16 @@ config IA64_SGI_SN_SIM
 	  If you are compiling a kernel that will run under SGI's IA-64
 	  simulator (Medusa) then say Y, otherwise say N.
 
+config IA64_SGI_SN_XP
+	tristate "Support communication between SGI SSIs"
+	depends on MSPEC
+	help
+	  An SGI machine can be divided into multiple Single System
+	  Images which act independently of each other and have
+	  hardware based memory protection from the others.  Enabling
+	  this feature will allow for direct communication between SSIs
+	  based on a network adapter and DMA messaging.
+
 config FORCE_MAX_ZONEORDER
 	int
 	default "18"
@@ -261,6 +271,15 @@ config HOTPLUG_CPU
 	  can be controlled through /sys/devices/system/cpu/cpu#.
 	  Say N if you want to disable CPU hotplug.
 
+config SCHED_SMT
+	bool "SMT scheduler support"
+	depends on SMP
+	default off
+	help
+	  Improves the CPU scheduler's decision making when dealing with
+	  Intel IA64 chips with MultiThreading at a cost of slightly increased
+	  overhead in some places. If unsure say N here.
+
 config PREEMPT
 	bool "Preemptible Kernel"
         help

arch/ia64/configs/tiger_defconfig

@@ -1,7 +1,7 @@
 #
 # Automatically generated make config: don't edit
-# Linux kernel version: 2.6.11-rc2
-# Sat Jan 22 11:17:02 2005
+# Linux kernel version: 2.6.12-rc3
+# Tue May  3 15:55:04 2005
 #
 
 #
@@ -10,6 +10,7 @@
 CONFIG_EXPERIMENTAL=y
 CONFIG_CLEAN_COMPILE=y
 CONFIG_LOCK_KERNEL=y
+CONFIG_INIT_ENV_ARG_LIMIT=32
 
 #
 # General setup
@@ -21,24 +22,27 @@ CONFIG_POSIX_MQUEUE=y
 # CONFIG_BSD_PROCESS_ACCT is not set
 CONFIG_SYSCTL=y
 # CONFIG_AUDIT is not set
-CONFIG_LOG_BUF_SHIFT=20
 CONFIG_HOTPLUG=y
 CONFIG_KOBJECT_UEVENT=y
 CONFIG_IKCONFIG=y
 CONFIG_IKCONFIG_PROC=y
+# CONFIG_CPUSETS is not set
 # CONFIG_EMBEDDED is not set
 CONFIG_KALLSYMS=y
 CONFIG_KALLSYMS_ALL=y
 # CONFIG_KALLSYMS_EXTRA_PASS is not set
+CONFIG_PRINTK=y
+CONFIG_BUG=y
+CONFIG_BASE_FULL=y
 CONFIG_FUTEX=y
 CONFIG_EPOLL=y
-# CONFIG_CC_OPTIMIZE_FOR_SIZE is not set
 CONFIG_SHMEM=y
 CONFIG_CC_ALIGN_FUNCTIONS=0
 CONFIG_CC_ALIGN_LABELS=0
 CONFIG_CC_ALIGN_LOOPS=0
 CONFIG_CC_ALIGN_JUMPS=0
 # CONFIG_TINY_SHMEM is not set
+CONFIG_BASE_SMALL=0
 
 #
 # Loadable module support
@@ -85,6 +89,7 @@ CONFIG_FORCE_MAX_ZONEORDER=18
 CONFIG_SMP=y
 CONFIG_NR_CPUS=4
 CONFIG_HOTPLUG_CPU=y
+# CONFIG_SCHED_SMT is not set
 # CONFIG_PREEMPT is not set
 CONFIG_HAVE_DEC_LOCK=y
 CONFIG_IA32_SUPPORT=y
@@ -135,6 +140,7 @@ CONFIG_PCI_DOMAINS=y
 # CONFIG_PCI_MSI is not set
 CONFIG_PCI_LEGACY_PROC=y
 CONFIG_PCI_NAMES=y
+# CONFIG_PCI_DEBUG is not set
 
 #
 # PCI Hotplug Support
@@ -151,10 +157,6 @@ CONFIG_HOTPLUG_PCI_ACPI=m
 #
 # CONFIG_PCCARD is not set
 
-#
-# PC-card bridges
-#
-
 #
 # Device Drivers
 #
@@ -195,9 +197,10 @@ CONFIG_BLK_DEV_CRYPTOLOOP=m
 CONFIG_BLK_DEV_NBD=m
 # CONFIG_BLK_DEV_SX8 is not set
 # CONFIG_BLK_DEV_UB is not set
-CONFIG_BLK_DEV_RAM=m
+CONFIG_BLK_DEV_RAM=y
 CONFIG_BLK_DEV_RAM_COUNT=16
 CONFIG_BLK_DEV_RAM_SIZE=4096
+CONFIG_BLK_DEV_INITRD=y
 CONFIG_INITRAMFS_SOURCE=""
 # CONFIG_CDROM_PKTCDVD is not set
 
@@ -313,7 +316,6 @@ CONFIG_SCSI_FC_ATTRS=y
 # CONFIG_SCSI_BUSLOGIC is not set
 # CONFIG_SCSI_DMX3191D is not set
 # CONFIG_SCSI_EATA is not set
-# CONFIG_SCSI_EATA_PIO is not set
 # CONFIG_SCSI_FUTURE_DOMAIN is not set
 # CONFIG_SCSI_GDTH is not set
 # CONFIG_SCSI_IPS is not set
@@ -325,7 +327,6 @@ CONFIG_SCSI_SYM53C8XX_DEFAULT_TAGS=16
 CONFIG_SCSI_SYM53C8XX_MAX_TAGS=64
 # CONFIG_SCSI_SYM53C8XX_IOMAPPED is not set
 # CONFIG_SCSI_IPR is not set
-# CONFIG_SCSI_QLOGIC_ISP is not set
 CONFIG_SCSI_QLOGIC_FC=y
 # CONFIG_SCSI_QLOGIC_FC_FIRMWARE is not set
 CONFIG_SCSI_QLOGIC_1280=y
@@ -336,6 +337,7 @@ CONFIG_SCSI_QLA22XX=m
 CONFIG_SCSI_QLA2300=m
 CONFIG_SCSI_QLA2322=m
 # CONFIG_SCSI_QLA6312 is not set
+# CONFIG_SCSI_LPFC is not set
 # CONFIG_SCSI_DC395x is not set
 # CONFIG_SCSI_DC390T is not set
 # CONFIG_SCSI_DEBUG is not set
@@ -358,6 +360,7 @@ CONFIG_DM_CRYPT=m
 CONFIG_DM_SNAPSHOT=m
 CONFIG_DM_MIRROR=m
 CONFIG_DM_ZERO=m
+# CONFIG_DM_MULTIPATH is not set
 
 #
 # Fusion MPT device support
@@ -386,7 +389,6 @@ CONFIG_NET=y
 #
 CONFIG_PACKET=y
 # CONFIG_PACKET_MMAP is not set
-CONFIG_NETLINK_DEV=y
 CONFIG_UNIX=y
 # CONFIG_NET_KEY is not set
 CONFIG_INET=y
@@ -446,7 +448,6 @@ CONFIG_DUMMY=m
 # CONFIG_BONDING is not set
 # CONFIG_EQUALIZER is not set
 # CONFIG_TUN is not set
-# CONFIG_ETHERTAP is not set
 
 #
 # ARCnet devices
@@ -484,7 +485,6 @@ CONFIG_NET_PCI=y
 # CONFIG_DGRS is not set
 CONFIG_EEPRO100=m
 CONFIG_E100=m
-# CONFIG_E100_NAPI is not set
 # CONFIG_FEALNX is not set
 # CONFIG_NATSEMI is not set
 # CONFIG_NE2K_PCI is not set
@@ -565,25 +565,6 @@ CONFIG_INPUT_MOUSEDEV_SCREEN_Y=768
 # CONFIG_INPUT_EVDEV is not set
 # CONFIG_INPUT_EVBUG is not set
 
-#
-# Input I/O drivers
-#
-CONFIG_GAMEPORT=m
-CONFIG_SOUND_GAMEPORT=m
-# CONFIG_GAMEPORT_NS558 is not set
-# CONFIG_GAMEPORT_L4 is not set
-# CONFIG_GAMEPORT_EMU10K1 is not set
-# CONFIG_GAMEPORT_VORTEX is not set
-# CONFIG_GAMEPORT_FM801 is not set
-# CONFIG_GAMEPORT_CS461X is not set
-CONFIG_SERIO=y
-CONFIG_SERIO_I8042=y
-# CONFIG_SERIO_SERPORT is not set
-# CONFIG_SERIO_CT82C710 is not set
-# CONFIG_SERIO_PCIPS2 is not set
-CONFIG_SERIO_LIBPS2=y
-# CONFIG_SERIO_RAW is not set
-
 #
 # Input Device Drivers
 #
@@ -601,6 +582,24 @@ CONFIG_MOUSE_PS2=y
 # CONFIG_INPUT_TOUCHSCREEN is not set
 # CONFIG_INPUT_MISC is not set
 
+#
+# Hardware I/O ports
+#
+CONFIG_SERIO=y
+CONFIG_SERIO_I8042=y
+# CONFIG_SERIO_SERPORT is not set
+# CONFIG_SERIO_PCIPS2 is not set
+CONFIG_SERIO_LIBPS2=y
+# CONFIG_SERIO_RAW is not set
+CONFIG_GAMEPORT=m
+# CONFIG_GAMEPORT_NS558 is not set
+# CONFIG_GAMEPORT_L4 is not set
+# CONFIG_GAMEPORT_EMU10K1 is not set
+# CONFIG_GAMEPORT_VORTEX is not set
+# CONFIG_GAMEPORT_FM801 is not set
+# CONFIG_GAMEPORT_CS461X is not set
+CONFIG_SOUND_GAMEPORT=m
+
 #
 # Character devices
 #
@@ -615,6 +614,8 @@ CONFIG_SERIAL_NONSTANDARD=y
 # CONFIG_SYNCLINK is not set
 # CONFIG_SYNCLINKMP is not set
 # CONFIG_N_HDLC is not set
+# CONFIG_SPECIALIX is not set
+# CONFIG_SX is not set
 # CONFIG_STALDRV is not set
 
 #
@@ -635,6 +636,7 @@ CONFIG_SERIAL_8250_SHARE_IRQ=y
 #
 CONFIG_SERIAL_CORE=y
 CONFIG_SERIAL_CORE_CONSOLE=y
+# CONFIG_SERIAL_JSM is not set
 CONFIG_UNIX98_PTYS=y
 CONFIG_LEGACY_PTYS=y
 CONFIG_LEGACY_PTY_COUNT=256
@@ -670,6 +672,12 @@ CONFIG_HPET=y
 # CONFIG_HPET_RTC_IRQ is not set
 CONFIG_HPET_MMAP=y
 CONFIG_MAX_RAW_DEVS=256
+# CONFIG_HANGCHECK_TIMER is not set
+
+#
+# TPM devices
+#
+# CONFIG_TCG_TPM is not set
 
 #
 # I2C support
@@ -705,7 +713,6 @@ CONFIG_MAX_RAW_DEVS=256
 #
 CONFIG_VGA_CONSOLE=y
 CONFIG_DUMMY_CONSOLE=y
-# CONFIG_BACKLIGHT_LCD_SUPPORT is not set
 
 #
 # Sound
@@ -715,6 +722,8 @@ CONFIG_DUMMY_CONSOLE=y
 #
 # USB support
 #
+CONFIG_USB_ARCH_HAS_HCD=y
+CONFIG_USB_ARCH_HAS_OHCI=y
 CONFIG_USB=y
 # CONFIG_USB_DEBUG is not set
 
@@ -726,8 +735,6 @@ CONFIG_USB_DEVICEFS=y
 # CONFIG_USB_DYNAMIC_MINORS is not set
 # CONFIG_USB_SUSPEND is not set
 # CONFIG_USB_OTG is not set
-CONFIG_USB_ARCH_HAS_HCD=y
-CONFIG_USB_ARCH_HAS_OHCI=y
 
 #
 # USB Host Controller Drivers
@@ -736,6 +743,8 @@ CONFIG_USB_EHCI_HCD=m
 # CONFIG_USB_EHCI_SPLIT_ISO is not set
 # CONFIG_USB_EHCI_ROOT_HUB_TT is not set
 CONFIG_USB_OHCI_HCD=m
+# CONFIG_USB_OHCI_BIG_ENDIAN is not set
+CONFIG_USB_OHCI_LITTLE_ENDIAN=y
 CONFIG_USB_UHCI_HCD=y
 # CONFIG_USB_SL811_HCD is not set
 
@@ -751,12 +760,11 @@ CONFIG_USB_UHCI_HCD=y
 #
 CONFIG_USB_STORAGE=m
 # CONFIG_USB_STORAGE_DEBUG is not set
-# CONFIG_USB_STORAGE_RW_DETECT is not set
 # CONFIG_USB_STORAGE_DATAFAB is not set
 # CONFIG_USB_STORAGE_FREECOM is not set
 # CONFIG_USB_STORAGE_ISD200 is not set
 # CONFIG_USB_STORAGE_DPCM is not set
-# CONFIG_USB_STORAGE_HP8200e is not set
+# CONFIG_USB_STORAGE_USBAT is not set
 # CONFIG_USB_STORAGE_SDDR09 is not set
 # CONFIG_USB_STORAGE_SDDR55 is not set
 # CONFIG_USB_STORAGE_JUMPSHOT is not set
@@ -800,6 +808,7 @@ CONFIG_USB_HIDINPUT=y
 # CONFIG_USB_PEGASUS is not set
 # CONFIG_USB_RTL8150 is not set
 # CONFIG_USB_USBNET is not set
+# CONFIG_USB_MON is not set
 
 #
 # USB port drivers
@@ -824,6 +833,7 @@ CONFIG_USB_HIDINPUT=y
 # CONFIG_USB_PHIDGETKIT is not set
 # CONFIG_USB_PHIDGETSERVO is not set
 # CONFIG_USB_IDMOUSE is not set
+# CONFIG_USB_SISUSBVGA is not set
 # CONFIG_USB_TEST is not set
 
 #
@@ -867,7 +877,12 @@ CONFIG_REISERFS_FS_POSIX_ACL=y
 CONFIG_REISERFS_FS_SECURITY=y
 # CONFIG_JFS_FS is not set
 CONFIG_FS_POSIX_ACL=y
+
+#
+# XFS support
+#
 CONFIG_XFS_FS=y
+CONFIG_XFS_EXPORT=y
 # CONFIG_XFS_RT is not set
 # CONFIG_XFS_QUOTA is not set
 # CONFIG_XFS_SECURITY is not set
@@ -945,7 +960,7 @@ CONFIG_NFSD_V4=y
 CONFIG_NFSD_TCP=y
 CONFIG_LOCKD=m
 CONFIG_LOCKD_V4=y
-CONFIG_EXPORTFS=m
+CONFIG_EXPORTFS=y
 CONFIG_SUNRPC=m
 CONFIG_SUNRPC_GSS=m
 CONFIG_RPCSEC_GSS_KRB5=m
@@ -1042,8 +1057,10 @@ CONFIG_GENERIC_IRQ_PROBE=y
 #
 # Kernel hacking
 #
+# CONFIG_PRINTK_TIME is not set
 CONFIG_DEBUG_KERNEL=y
 CONFIG_MAGIC_SYSRQ=y
+CONFIG_LOG_BUF_SHIFT=20
 # CONFIG_SCHEDSTATS is not set
 # CONFIG_DEBUG_SLAB is not set
 # CONFIG_DEBUG_SPINLOCK is not set
@@ -1077,6 +1094,7 @@ CONFIG_CRYPTO_MD5=m
 # CONFIG_CRYPTO_SHA256 is not set
 # CONFIG_CRYPTO_SHA512 is not set
 # CONFIG_CRYPTO_WP512 is not set
+# CONFIG_CRYPTO_TGR192 is not set
 CONFIG_CRYPTO_DES=m
 # CONFIG_CRYPTO_BLOWFISH is not set
 # CONFIG_CRYPTO_TWOFISH is not set

arch/ia64/hp/common/sba_iommu.c

@@ -1944,43 +1944,17 @@ sba_connect_bus(struct pci_bus *bus)
 static void __init
 sba_map_ioc_to_node(struct ioc *ioc, acpi_handle handle)
 {
-	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
-	union acpi_object *obj;
-	acpi_handle phandle;
 	unsigned int node;
+	int pxm;
 
 	ioc->node = MAX_NUMNODES;
 
-	/*
-	 * Check for a _PXM on this node first.  We don't typically see
-	 * one here, so we'll end up getting it from the parent.
-	 */
-	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_PXM", NULL, &buffer))) {
-		if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
-			return;
-
-		/* Reset the acpi buffer */
-		buffer.length = ACPI_ALLOCATE_BUFFER;
-		buffer.pointer = NULL;
-
-		if (ACPI_FAILURE(acpi_evaluate_object(phandle, "_PXM", NULL,
-		                                      &buffer)))
-			return;
-	}
+	pxm = acpi_get_pxm(handle);
 
-	if (!buffer.length || !buffer.pointer)
+	if (pxm < 0)
 		return;
 
-	obj = buffer.pointer;
-
-	if (obj->type != ACPI_TYPE_INTEGER ||
-	    obj->integer.value >= MAX_PXM_DOMAINS) {
-		acpi_os_free(buffer.pointer);
-		return;
-	}
-
-	node = pxm_to_nid_map[obj->integer.value];
-	acpi_os_free(buffer.pointer);
+	node = pxm_to_nid_map[pxm];
 
 	if (node >= MAX_NUMNODES || !node_online(node))
 		return;

arch/ia64/kernel/acpi.c

@@ -779,7 +779,7 @@ acpi_map_iosapic (acpi_handle handle, u32 depth, void *context, void **ret)
 	union acpi_object *obj;
 	struct acpi_table_iosapic *iosapic;
 	unsigned int gsi_base;
-	int node;
+	int pxm, node;
 
 	/* Only care about objects w/ a method that returns the MADT */
 	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
@@ -805,29 +805,16 @@ acpi_map_iosapic (acpi_handle handle, u32 depth, void *context, void **ret)
 	gsi_base = iosapic->global_irq_base;
 
 	acpi_os_free(buffer.pointer);
-	buffer.length = ACPI_ALLOCATE_BUFFER;
-	buffer.pointer = NULL;
 
 	/*
-	 * OK, it's an IOSAPIC MADT entry, look for a _PXM method to tell
+	 * OK, it's an IOSAPIC MADT entry, look for a _PXM value to tell
 	 * us which node to associate this with.
 	 */
-	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_PXM", NULL, &buffer)))
-		return AE_OK;
-
-	if (!buffer.length || !buffer.pointer)
-		return AE_OK;
-
-	obj = buffer.pointer;
-
-	if (obj->type != ACPI_TYPE_INTEGER ||
-	    obj->integer.value >= MAX_PXM_DOMAINS) {
-		acpi_os_free(buffer.pointer);
+	pxm = acpi_get_pxm(handle);
+	if (pxm < 0)
 		return AE_OK;
-	}
 
-	node = pxm_to_nid_map[obj->integer.value];
-	acpi_os_free(buffer.pointer);
+	node = pxm_to_nid_map[pxm];
 
 	if (node >= MAX_NUMNODES || !node_online(node) ||
 	    cpus_empty(node_to_cpumask(node)))

arch/ia64/kernel/entry.S

@@ -782,7 +782,7 @@ GLOBAL_ENTRY(ia64_ret_from_ia32_execve)
 	st8.spill [r2]=r8	// store return value in slot for r8 and set unat bit
 	.mem.offset 8,0
 	st8.spill [r3]=r0	// clear error indication in slot for r10 and set unat bit
-END(ia64_ret_from_ia32_execve_syscall)
+END(ia64_ret_from_ia32_execve)
 	// fall through
 #endif /* CONFIG_IA32_SUPPORT */
 GLOBAL_ENTRY(ia64_leave_kernel)

arch/ia64/kernel/mca_drv.c

@@ -132,8 +132,7 @@ mca_handler_bh(unsigned long paddr)
 	spin_unlock(&mca_bh_lock);
 
 	/* This process is about to be killed itself */
-	force_sig(SIGKILL, current);
-	schedule();
+	do_exit(SIGKILL);
 }
 
 /**
@@ -439,6 +438,7 @@ recover_from_read_error(slidx_table_t *slidx, peidx_table_t *peidx, pal_bus_chec
 			psr2 = (struct ia64_psr *)&pmsa->pmsa_ipsr;
 			psr2->cpl = 0;
 			psr2->ri  = 0;
+			psr2->i  = 0;
 
 			return 1;
 		}

arch/ia64/kernel/mca_drv_asm.S

@@ -10,6 +10,7 @@
 
 #include <asm/asmmacro.h>
 #include <asm/processor.h>
+#include <asm/ptrace.h>
 
 GLOBAL_ENTRY(mca_handler_bhhook)
 	invala						// clear RSE ?
@@ -20,12 +21,21 @@ GLOBAL_ENTRY(mca_handler_bhhook)
 	;;						
 	alloc		r16=ar.pfs,0,2,1,0		// make a new frame
 	;;
+	mov		ar.rsc=0
+	;;
 	mov		r13=IA64_KR(CURRENT)		// current task pointer
 	;;
-	adds		r12=IA64_TASK_THREAD_KSP_OFFSET,r13
+	mov		r2=r13
+	;;
+	addl		r22=IA64_RBS_OFFSET,r2
+	;;
+	mov		ar.bspstore=r22
 	;;
-	ld8		r12=[r12]			// stack pointer
+	addl		sp=IA64_STK_OFFSET-IA64_PT_REGS_SIZE,r2
 	;;
+	adds		r2=IA64_TASK_THREAD_ON_USTACK_OFFSET,r13
+	;;
+	st1		[r2]=r0				// clear current->thread.on_ustack flag
 	mov		loc0=r16
 	movl		loc1=mca_handler_bh		// recovery C function
 	;;
@@ -34,7 +44,9 @@ GLOBAL_ENTRY(mca_handler_bhhook)
 	;;
 	mov		loc1=rp
 	;;
-	br.call.sptk.many    rp=b6			// not return ...
+	ssm		psr.i
+	;;
+	br.call.sptk.many    rp=b6			// does not return ...
 	;;
 	mov		ar.pfs=loc0
 	mov 		rp=loc1

arch/ia64/kernel/perfmon.c

@@ -1265,6 +1265,8 @@ out:
 }
 EXPORT_SYMBOL(pfm_unregister_buffer_fmt);
 
+extern void update_pal_halt_status(int);
+
 static int
 pfm_reserve_session(struct task_struct *task, int is_syswide, unsigned int cpu)
 {
@@ -1311,6 +1313,11 @@ pfm_reserve_session(struct task_struct *task, int is_syswide, unsigned int cpu)
 		is_syswide,
 		cpu));
 
+	/*
+	 * disable default_idle() to go to PAL_HALT
+	 */
+	update_pal_halt_status(0);
+
 	UNLOCK_PFS(flags);
 
 	return 0;
@@ -1366,6 +1373,12 @@ pfm_unreserve_session(pfm_context_t *ctx, int is_syswide, unsigned int cpu)
 		is_syswide,
 		cpu));
 
+	/*
+	 * if possible, enable default_idle() to go into PAL_HALT
+	 */
+	if (pfm_sessions.pfs_task_sessions == 0 && pfm_sessions.pfs_sys_sessions == 0)
+		update_pal_halt_status(1);
+
 	UNLOCK_PFS(flags);
 
 	return 0;
@@ -4202,7 +4215,7 @@ pfm_context_load(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
 		DPRINT(("cannot load to [%d], invalid ctx_state=%d\n",
 			req->load_pid,
 			ctx->ctx_state));
-		return -EINVAL;
+		return -EBUSY;
 	}
 
 	DPRINT(("load_pid [%d] using_dbreg=%d\n", req->load_pid, ctx->ctx_fl_using_dbreg));
@@ -4704,16 +4717,26 @@ recheck:
 	if (task == current || ctx->ctx_fl_system) return 0;
 
 	/*
-	 * if context is UNLOADED we are safe to go
-	 */
-	if (state == PFM_CTX_UNLOADED) return 0;
-
-	/*
-	 * no command can operate on a zombie context
+	 * we are monitoring another thread
 	 */
-	if (state == PFM_CTX_ZOMBIE) {
-		DPRINT(("cmd %d state zombie cannot operate on context\n", cmd));
-		return -EINVAL;
+	switch(state) {
+		case PFM_CTX_UNLOADED:
+			/*
+			 * if context is UNLOADED we are safe to go
+			 */
+			return 0;
+		case PFM_CTX_ZOMBIE:
+			/*
+			 * no command can operate on a zombie context
+			 */
+			DPRINT(("cmd %d state zombie cannot operate on context\n", cmd));
+			return -EINVAL;
+		case PFM_CTX_MASKED:
+			/*
+			 * PMU state has been saved to software even though
+			 * the thread may still be running.
+			 */
+			if (cmd != PFM_UNLOAD_CONTEXT) return 0;
 	}
 
 	/*

arch/ia64/kernel/process.c

@@ -50,7 +50,7 @@
 #include "sigframe.h"
 
 void (*ia64_mark_idle)(int);
-static cpumask_t cpu_idle_map;
+static DEFINE_PER_CPU(unsigned int, cpu_idle_state);
 
 unsigned long boot_option_idle_override = 0;
 EXPORT_SYMBOL(boot_option_idle_override);
@@ -173,7 +173,9 @@ do_notify_resume_user (sigset_t *oldset, struct sigscratch *scr, long in_syscall
 		ia64_do_signal(oldset, scr, in_syscall);
 }
 
-static int pal_halt = 1;
+static int pal_halt        = 1;
+static int can_do_pal_halt = 1;
+
 static int __init nohalt_setup(char * str)
 {
 	pal_halt = 0;
@@ -181,16 +183,20 @@ static int __init nohalt_setup(char * str)
 }
 __setup("nohalt", nohalt_setup);
 
+void
+update_pal_halt_status(int status)
+{
+	can_do_pal_halt = pal_halt && status;
+}
+
 /*
  * We use this if we don't have any better idle routine..
  */
 void
 default_idle (void)
 {
-	unsigned long pmu_active = ia64_getreg(_IA64_REG_PSR) & (IA64_PSR_PP | IA64_PSR_UP);
-
 	while (!need_resched())
-		if (pal_halt && !pmu_active)
+		if (can_do_pal_halt)
 			safe_halt();
 		else
 			cpu_relax();
@@ -223,20 +229,31 @@ static inline void play_dead(void)
 }
 #endif /* CONFIG_HOTPLUG_CPU */
 
-
 void cpu_idle_wait(void)
 {
-        int cpu;
-        cpumask_t map;
+	unsigned int cpu, this_cpu = get_cpu();
+	cpumask_t map;
 
-        for_each_online_cpu(cpu)
-                cpu_set(cpu, cpu_idle_map);
+	set_cpus_allowed(current, cpumask_of_cpu(this_cpu));
+	put_cpu();
 
-        wmb();
-        do {
-                ssleep(1);
-                cpus_and(map, cpu_idle_map, cpu_online_map);
-        } while (!cpus_empty(map));
+	cpus_clear(map);
+	for_each_online_cpu(cpu) {
+		per_cpu(cpu_idle_state, cpu) = 1;
+		cpu_set(cpu, map);
+	}
+
+	__get_cpu_var(cpu_idle_state) = 0;
+
+	wmb();
+	do {
+		ssleep(1);
+		for_each_online_cpu(cpu) {
+			if (cpu_isset(cpu, map) && !per_cpu(cpu_idle_state, cpu))
+				cpu_clear(cpu, map);
+		}
+		cpus_and(map, map, cpu_online_map);
+	} while (!cpus_empty(map));
 }
 EXPORT_SYMBOL_GPL(cpu_idle_wait);
 
@@ -244,7 +261,6 @@ void __attribute__((noreturn))
 cpu_idle (void)
 {
 	void (*mark_idle)(int) = ia64_mark_idle;
-	int cpu = smp_processor_id();
 
 	/* endless idle loop with no priority at all */
 	while (1) {
@@ -255,12 +271,13 @@ cpu_idle (void)
 		while (!need_resched()) {
 			void (*idle)(void);
 
+			if (__get_cpu_var(cpu_idle_state))
+				__get_cpu_var(cpu_idle_state) = 0;
+
+			rmb();
 			if (mark_idle)
 				(*mark_idle)(1);
 
-			if (cpu_isset(cpu, cpu_idle_map))
-				cpu_clear(cpu, cpu_idle_map);
-			rmb();
 			idle = pm_idle;
 			if (!idle)
 				idle = default_idle;

arch/ia64/kernel/signal.c

@@ -224,7 +224,7 @@ ia64_rt_sigreturn (struct sigscratch *scr)
 	 * could be corrupted.
 	 */
 	retval = (long) &ia64_leave_kernel;
-	if (test_thread_flag(TIF_SYSCALL_TRACE) 
+	if (test_thread_flag(TIF_SYSCALL_TRACE)
 	    || test_thread_flag(TIF_SYSCALL_AUDIT))
 		/*
 		 * strace expects to be notified after sigreturn returns even though the

arch/ia64/lib/flush.S

@@ -1,8 +1,8 @@
 /*
  * Cache flushing routines.
  *
- * Copyright (C) 1999-2001 Hewlett-Packard Co
- * Copyright (C) 1999-2001 David Mosberger-Tang <davidm@hpl.hp.com>
+ * Copyright (C) 1999-2001, 2005 Hewlett-Packard Co
+ *	David Mosberger-Tang <davidm@hpl.hp.com>
  */
 #include <asm/asmmacro.h>
 #include <asm/page.h>
@@ -26,7 +26,7 @@ GLOBAL_ENTRY(flush_icache_range)
 
 	mov ar.lc=r8
 	;;
-.Loop:	fc in0				// issuable on M0 only
+.Loop:	fc.i in0			// issuable on M2 only
 	add in0=32,in0
 	br.cloop.sptk.few .Loop
 	;;

arch/ia64/lib/memcpy_mck.S

@@ -75,6 +75,7 @@ GLOBAL_ENTRY(memcpy)
 	mov	f6=f0
 	br.cond.sptk .common_code
 	;;
+END(memcpy)
 GLOBAL_ENTRY(__copy_user)
 	.prologue
 // check dest alignment
@@ -524,7 +525,6 @@ EK(.ex_handler,  (p17)	st8	[dst1]=r39,8);						\
 #undef B
 #undef C
 #undef D
-END(memcpy)
 
 /*
  * Due to lack of local tag support in gcc 2.x assembler, it is not clear which

arch/ia64/lib/memset.S

@@ -57,10 +57,10 @@ GLOBAL_ENTRY(memset)
 { .mmi
 	.prologue
 	alloc	tmp = ar.pfs, 3, 0, 0, 0
-	.body
 	lfetch.nt1 [dest]			//
 	.save   ar.lc, save_lc
 	mov.i	save_lc = ar.lc
+	.body
 } { .mmi
 	mov	ret0 = dest			// return value
 	cmp.ne	p_nz, p_zr = value, r0		// use stf.spill if value is zero

arch/ia64/sn/kernel/Makefile

@@ -4,10 +4,15 @@
 # License.  See the file "COPYING" in the main directory of this archive
 # for more details.
 #
-# Copyright (C) 1999,2001-2003 Silicon Graphics, Inc.  All Rights Reserved.
+# Copyright (C) 1999,2001-2005 Silicon Graphics, Inc.  All Rights Reserved.
 #
 
 obj-y				+= setup.o bte.o bte_error.o irq.o mca.o idle.o \
 				   huberror.o io_init.o iomv.o klconflib.o sn2/
 obj-$(CONFIG_IA64_GENERIC)      += machvec.o
 obj-$(CONFIG_SGI_TIOCX)		+= tiocx.o
+obj-$(CONFIG_IA64_SGI_SN_XP)	+= xp.o
+xp-y				:= xp_main.o xp_nofault.o
+obj-$(CONFIG_IA64_SGI_SN_XP)	+= xpc.o
+xpc-y				:= xpc_main.o xpc_channel.o xpc_partition.o
+obj-$(CONFIG_IA64_SGI_SN_XP)	+= xpnet.o

arch/ia64/sn/kernel/io_init.c

@@ -174,6 +174,12 @@ static void sn_fixup_ionodes(void)
 		if (status)
 			continue;
 
+		/* Attach the error interrupt handlers */
+		if (nasid & 1)
+			ice_error_init(hubdev);
+		else
+			hub_error_init(hubdev);
+
 		for (widget = 0; widget <= HUB_WIDGET_ID_MAX; widget++)
 			hubdev->hdi_xwidget_info[widget].xwi_hubinfo = hubdev;
 
@@ -211,10 +217,6 @@ static void sn_fixup_ionodes(void)
 			    sn_flush_device_list;
 		}
 
-		if (!(i & 1))
-			hub_error_init(hubdev);
-		else
-			ice_error_init(hubdev);
 	}
 
 }

arch/ia64/sn/kernel/mca.c

@@ -37,6 +37,11 @@ static u64 *sn_oemdata_size, sn_oemdata_bufsize;
  * This function is the callback routine that SAL calls to log error
  * info for platform errors.  buf is appended to sn_oemdata, resizing as
  * required.
+ * Note: this is a SAL to OS callback, running under the same rules as the SAL
+ * code.  SAL calls are run with preempt disabled so this routine must not
+ * sleep.  vmalloc can sleep so print_hook cannot resize the output buffer
+ * itself, instead it must set the required size and return to let the caller
+ * resize the buffer then redrive the SAL call.
  */
 static int print_hook(const char *fmt, ...)
 {
@@ -47,18 +52,8 @@ static int print_hook(const char *fmt, ...)
 	vsnprintf(buf, sizeof(buf), fmt, args);
 	va_end(args);
 	len = strlen(buf);
-	while (*sn_oemdata_size + len + 1 > sn_oemdata_bufsize) {
-		u8 *newbuf = vmalloc(sn_oemdata_bufsize += 1000);
-		if (!newbuf) {
-			printk(KERN_ERR "%s: unable to extend sn_oemdata\n",
-			       __FUNCTION__);
-			return 0;
-		}
-		memcpy(newbuf, *sn_oemdata, *sn_oemdata_size);
-		vfree(*sn_oemdata);
-		*sn_oemdata = newbuf;
-	}
-	memcpy(*sn_oemdata + *sn_oemdata_size, buf, len + 1);
+	if (*sn_oemdata_size + len <= sn_oemdata_bufsize)
+		memcpy(*sn_oemdata + *sn_oemdata_size, buf, len);
 	*sn_oemdata_size += len;
 	return 0;
 }
@@ -98,7 +93,20 @@ sn_platform_plat_specific_err_print(const u8 * sect_header, u8 ** oemdata,
 	sn_oemdata = oemdata;
 	sn_oemdata_size = oemdata_size;
 	sn_oemdata_bufsize = 0;
-	ia64_sn_plat_specific_err_print(print_hook, (char *)sect_header);
+	*sn_oemdata_size = PAGE_SIZE;	/* first guess at how much data will be generated */
+	while (*sn_oemdata_size > sn_oemdata_bufsize) {
+		u8 *newbuf = vmalloc(*sn_oemdata_size);
+		if (!newbuf) {
+			printk(KERN_ERR "%s: unable to extend sn_oemdata\n",
+			       __FUNCTION__);
+			return 1;
+		}
+		vfree(*sn_oemdata);
+		*sn_oemdata = newbuf;
+		sn_oemdata_bufsize = *sn_oemdata_size;
+		*sn_oemdata_size = 0;
+		ia64_sn_plat_specific_err_print(print_hook, (char *)sect_header);
+	}
 	up(&sn_oemdata_mutex);
 	return 0;
 }

arch/ia64/sn/kernel/setup.c

@@ -3,7 +3,7 @@
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
  *
- * Copyright (C) 1999,2001-2004 Silicon Graphics, Inc. All rights reserved.
+ * Copyright (C) 1999,2001-2005 Silicon Graphics, Inc. All rights reserved.
  */
 
 #include <linux/config.h>
@@ -73,6 +73,12 @@ EXPORT_SYMBOL(sn_rtc_cycles_per_second);
 DEFINE_PER_CPU(struct sn_hub_info_s, __sn_hub_info);
 EXPORT_PER_CPU_SYMBOL(__sn_hub_info);
 
+DEFINE_PER_CPU(short, __sn_cnodeid_to_nasid[MAX_NUMNODES]);
+EXPORT_PER_CPU_SYMBOL(__sn_cnodeid_to_nasid);
+
+DEFINE_PER_CPU(struct nodepda_s *, __sn_nodepda);
+EXPORT_PER_CPU_SYMBOL(__sn_nodepda);
+
 partid_t sn_partid = -1;
 EXPORT_SYMBOL(sn_partid);
 char sn_system_serial_number_string[128];
@@ -373,11 +379,11 @@ static void __init sn_init_pdas(char **cmdline_p)
 {
 	cnodeid_t cnode;
 
-	memset(pda->cnodeid_to_nasid_table, -1,
-	       sizeof(pda->cnodeid_to_nasid_table));
+	memset(sn_cnodeid_to_nasid, -1,
+			sizeof(__ia64_per_cpu_var(__sn_cnodeid_to_nasid)));
 	for_each_online_node(cnode)
-		pda->cnodeid_to_nasid_table[cnode] =
-		    pxm_to_nasid(nid_to_pxm_map[cnode]);
+		sn_cnodeid_to_nasid[cnode] =
+				pxm_to_nasid(nid_to_pxm_map[cnode]);
 
 	numionodes = num_online_nodes();
 	scan_for_ionodes();
@@ -477,7 +483,8 @@ void __init sn_cpu_init(void)
 
 	cnode = nasid_to_cnodeid(nasid);
 
-	pda->p_nodepda = nodepdaindr[cnode];
+	sn_nodepda = nodepdaindr[cnode];
+
 	pda->led_address =
 	    (typeof(pda->led_address)) (LED0 + (slice << LED_CPU_SHIFT));
 	pda->led_state = LED_ALWAYS_SET;
@@ -486,15 +493,18 @@ void __init sn_cpu_init(void)
 	pda->idle_flag = 0;
 
 	if (cpuid != 0) {
-		memcpy(pda->cnodeid_to_nasid_table,
-		       pdacpu(0)->cnodeid_to_nasid_table,
-		       sizeof(pda->cnodeid_to_nasid_table));
+		/* copy cpu 0's sn_cnodeid_to_nasid table to this cpu's */
+		memcpy(sn_cnodeid_to_nasid,
+		       (&per_cpu(__sn_cnodeid_to_nasid, 0)),
+		       sizeof(__ia64_per_cpu_var(__sn_cnodeid_to_nasid)));
 	}
 
 	/*
 	 * Check for WARs.
 	 * Only needs to be done once, on BSP.
-	 * Has to be done after loop above, because it uses pda.cnodeid_to_nasid_table[i].
+	 * Has to be done after loop above, because it uses this cpu's
+	 * sn_cnodeid_to_nasid table which was just initialized if this
+	 * isn't cpu 0.
 	 * Has to be done before assignment below.
 	 */
 	if (!wars_have_been_checked) {
@@ -580,8 +590,7 @@ static void __init scan_for_ionodes(void)
 		brd = find_lboard_any(brd, KLTYPE_SNIA);
 
 		while (brd) {
-			pda->cnodeid_to_nasid_table[numionodes] =
-			    brd->brd_nasid;
+			sn_cnodeid_to_nasid[numionodes] = brd->brd_nasid;
 			physical_node_map[brd->brd_nasid] = numionodes;
 			root_lboard[numionodes] = brd;
 			numionodes++;
@@ -602,8 +611,7 @@ static void __init scan_for_ionodes(void)
 				      root_lboard[nasid_to_cnodeid(nasid)],
 				      KLTYPE_TIO);
 		while (brd) {
-			pda->cnodeid_to_nasid_table[numionodes] =
-			    brd->brd_nasid;
+			sn_cnodeid_to_nasid[numionodes] = brd->brd_nasid;
 			physical_node_map[brd->brd_nasid] = numionodes;
 			root_lboard[numionodes] = brd;
 			numionodes++;
@@ -614,7 +622,6 @@ static void __init scan_for_ionodes(void)
 			brd = find_lboard_any(brd, KLTYPE_TIO);
 		}
 	}
-
 }
 
 int
@@ -623,7 +630,8 @@ nasid_slice_to_cpuid(int nasid, int slice)
 	long cpu;
 	
 	for (cpu=0; cpu < NR_CPUS; cpu++) 
-		if (nodepda->phys_cpuid[cpu].nasid == nasid && nodepda->phys_cpuid[cpu].slice == slice)
+		if (cpuid_to_nasid(cpu) == nasid &&
+					cpuid_to_slice(cpu) == slice)
 			return cpu;
 
 	return -1;

arch/ia64/sn/kernel/tiocx.c

@@ -21,6 +21,8 @@
 #include <asm/sn/types.h>
 #include <asm/sn/shubio.h>
 #include <asm/sn/tiocx.h>
+#include <asm/sn/l1.h>
+#include <asm/sn/module.h>
 #include "tio.h"
 #include "xtalk/xwidgetdev.h"
 #include "xtalk/hubdev.h"
@@ -308,14 +310,12 @@ void tiocx_irq_free(struct sn_irq_info *sn_irq_info)
 	}
 }
 
-uint64_t
-tiocx_dma_addr(uint64_t addr)
+uint64_t tiocx_dma_addr(uint64_t addr)
 {
 	return PHYS_TO_TIODMA(addr);
 }
 
-uint64_t
-tiocx_swin_base(int nasid)
+uint64_t tiocx_swin_base(int nasid)
 {
 	return TIO_SWIN_BASE(nasid, TIOCX_CORELET);
 }
@@ -330,19 +330,6 @@ EXPORT_SYMBOL(tiocx_bus_type);
 EXPORT_SYMBOL(tiocx_dma_addr);
 EXPORT_SYMBOL(tiocx_swin_base);
 
-static uint64_t tiocx_get_hubdev_info(u64 handle, u64 address)
-{
-
-	struct ia64_sal_retval ret_stuff;
-	ret_stuff.status = 0;
-	ret_stuff.v0 = 0;
-
-	ia64_sal_oemcall_nolock(&ret_stuff,
-				SN_SAL_IOIF_GET_HUBDEV_INFO,
-				handle, address, 0, 0, 0, 0, 0);
-	return ret_stuff.v0;
-}
-
 static void tio_conveyor_set(nasid_t nasid, int enable_flag)
 {
 	uint64_t ice_frz;
@@ -379,7 +366,29 @@ static void tio_corelet_reset(nasid_t nasid, int corelet)
 	udelay(2000);
 }
 
-static int fpga_attached(nasid_t nasid)
+static int tiocx_btchar_get(int nasid)
+{
+	moduleid_t module_id;
+	geoid_t geoid;
+	int cnodeid;
+
+	cnodeid = nasid_to_cnodeid(nasid);
+	geoid = cnodeid_get_geoid(cnodeid);
+	module_id = geo_module(geoid);
+	return MODULE_GET_BTCHAR(module_id);
+}
+
+static int is_fpga_brick(int nasid)
+{
+	switch (tiocx_btchar_get(nasid)) {
+	case L1_BRICKTYPE_SA:
+	case L1_BRICKTYPE_ATHENA:
+		return 1;
+	}
+	return 0;
+}
+
+static int bitstream_loaded(nasid_t nasid)
 {
 	uint64_t cx_credits;
 
@@ -396,7 +405,7 @@ static int tiocx_reload(struct cx_dev *cx_dev)
 	int mfg_num = CX_DEV_NONE;
 	nasid_t nasid = cx_dev->cx_id.nasid;
 
-	if (fpga_attached(nasid)) {
+	if (bitstream_loaded(nasid)) {
 		uint64_t cx_id;
 
 		cx_id =
@@ -427,9 +436,10 @@ static ssize_t show_cxdev_control(struct device *dev, char *buf)
 {
 	struct cx_dev *cx_dev = to_cx_dev(dev);
 
-	return sprintf(buf, "0x%x 0x%x 0x%x\n",
+	return sprintf(buf, "0x%x 0x%x 0x%x %d\n",
 		       cx_dev->cx_id.nasid,
-		       cx_dev->cx_id.part_num, cx_dev->cx_id.mfg_num);
+		       cx_dev->cx_id.part_num, cx_dev->cx_id.mfg_num,
+		       tiocx_btchar_get(cx_dev->cx_id.nasid));
 }
 
 static ssize_t store_cxdev_control(struct device *dev, const char *buf,
@@ -475,20 +485,14 @@ static int __init tiocx_init(void)
 		if ((nasid = cnodeid_to_nasid(cnodeid)) < 0)
 			break;	/* No more nasids .. bail out of loop */
 
-		if (nasid & 0x1) {	/* TIO's are always odd */
+		if ((nasid & 0x1) && is_fpga_brick(nasid)) {
 			struct hubdev_info *hubdev;
-			uint64_t status;
 			struct xwidget_info *widgetp;
 
 			DBG("Found TIO at nasid 0x%x\n", nasid);
 
 			hubdev =
 			    (struct hubdev_info *)(NODEPDA(cnodeid)->pdinfo);
-			status =
-			    tiocx_get_hubdev_info(nasid,
-						  (uint64_t) __pa(hubdev));
-			if (status)
-				continue;
 
 			widgetp = &hubdev->hdi_xwidget_info[TIOCX_CORELET];
 

arch/ia64/sn/kernel/xp_main.c

@@ -0,0 +1,289 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 2004-2005 Silicon Graphics, Inc.  All Rights Reserved.
+ */
+
+
+/*
+ * Cross Partition (XP) base.
+ *
+ *	XP provides a base from which its users can interact
+ *	with XPC, yet not be dependent on XPC.
+ *
+ */
+
+
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <asm/sn/intr.h>
+#include <asm/sn/sn_sal.h>
+#include <asm/sn/xp.h>
+
+
+/*
+ * Target of nofault PIO read.
+ */
+u64 xp_nofault_PIOR_target;
+
+
+/*
+ * xpc_registrations[] keeps track of xpc_connect()'s done by the kernel-level
+ * users of XPC.
+ */
+struct xpc_registration xpc_registrations[XPC_NCHANNELS];
+
+
+/*
+ * Initialize the XPC interface to indicate that XPC isn't loaded.
+ */
+static enum xpc_retval xpc_notloaded(void) { return xpcNotLoaded; }
+
+struct xpc_interface xpc_interface = {
+	(void (*)(int)) xpc_notloaded,
+	(void (*)(int)) xpc_notloaded,
+	(enum xpc_retval (*)(partid_t, int, u32, void **)) xpc_notloaded,
+	(enum xpc_retval (*)(partid_t, int, void *)) xpc_notloaded,
+	(enum xpc_retval (*)(partid_t, int, void *, xpc_notify_func, void *))
+							xpc_notloaded,
+	(void (*)(partid_t, int, void *)) xpc_notloaded,
+	(enum xpc_retval (*)(partid_t, void *)) xpc_notloaded
+};
+
+
+/*
+ * XPC calls this when it (the XPC module) has been loaded.
+ */
+void
+xpc_set_interface(void (*connect)(int),
+		void (*disconnect)(int),
+		enum xpc_retval (*allocate)(partid_t, int, u32, void **),
+		enum xpc_retval (*send)(partid_t, int, void *),
+		enum xpc_retval (*send_notify)(partid_t, int, void *,
+						xpc_notify_func, void *),
+		void (*received)(partid_t, int, void *),
+		enum xpc_retval (*partid_to_nasids)(partid_t, void *))
+{
+	xpc_interface.connect = connect;
+	xpc_interface.disconnect = disconnect;
+	xpc_interface.allocate = allocate;
+	xpc_interface.send = send;
+	xpc_interface.send_notify = send_notify;
+	xpc_interface.received = received;
+	xpc_interface.partid_to_nasids = partid_to_nasids;
+}
+
+
+/*
+ * XPC calls this when it (the XPC module) is being unloaded.
+ */
+void
+xpc_clear_interface(void)
+{
+	xpc_interface.connect = (void (*)(int)) xpc_notloaded;
+	xpc_interface.disconnect = (void (*)(int)) xpc_notloaded;
+	xpc_interface.allocate = (enum xpc_retval (*)(partid_t, int, u32,
+					void **)) xpc_notloaded;
+	xpc_interface.send = (enum xpc_retval (*)(partid_t, int, void *))
+					xpc_notloaded;
+	xpc_interface.send_notify = (enum xpc_retval (*)(partid_t, int, void *,
+				    xpc_notify_func, void *)) xpc_notloaded;
+	xpc_interface.received = (void (*)(partid_t, int, void *))
+					xpc_notloaded;
+	xpc_interface.partid_to_nasids = (enum xpc_retval (*)(partid_t, void *))
+					xpc_notloaded;
+}
+
+
+/*
+ * Register for automatic establishment of a channel connection whenever
+ * a partition comes up.
+ *
+ * Arguments:
+ *
+ *	ch_number - channel # to register for connection.
+ *	func - function to call for asynchronous notification of channel
+ *	       state changes (i.e., connection, disconnection, error) and
+ *	       the arrival of incoming messages.
+ *      key - pointer to optional user-defined value that gets passed back
+ *	      to the user on any callouts made to func.
+ *	payload_size - size in bytes of the XPC message's payload area which
+ *		       contains a user-defined message. The user should make
+ *		       this large enough to hold their largest message.
+ *	nentries - max #of XPC message entries a message queue can contain.
+ *		   The actual number, which is determined when a connection
+ * 		   is established and may be less then requested, will be
+ *		   passed to the user via the xpcConnected callout.
+ *	assigned_limit - max number of kthreads allowed to be processing
+ * 			 messages (per connection) at any given instant.
+ *	idle_limit - max number of kthreads allowed to be idle at any given
+ * 		     instant.
+ */
+enum xpc_retval
+xpc_connect(int ch_number, xpc_channel_func func, void *key, u16 payload_size,
+		u16 nentries, u32 assigned_limit, u32 idle_limit)
+{
+	struct xpc_registration *registration;
+
+
+	DBUG_ON(ch_number < 0 || ch_number >= XPC_NCHANNELS);
+	DBUG_ON(payload_size == 0 || nentries == 0);
+	DBUG_ON(func == NULL);
+	DBUG_ON(assigned_limit == 0 || idle_limit > assigned_limit);
+
+	registration = &xpc_registrations[ch_number];
+
+	if (down_interruptible(&registration->sema) != 0) {
+		return xpcInterrupted;
+	}
+
+	/* if XPC_CHANNEL_REGISTERED(ch_number) */
+	if (registration->func != NULL) {
+		up(&registration->sema);
+		return xpcAlreadyRegistered;
+	}
+
+	/* register the channel for connection */
+	registration->msg_size = XPC_MSG_SIZE(payload_size);
+	registration->nentries = nentries;
+	registration->assigned_limit = assigned_limit;
+	registration->idle_limit = idle_limit;
+	registration->key = key;
+	registration->func = func;
+
+	up(&registration->sema);
+
+	xpc_interface.connect(ch_number);
+
+	return xpcSuccess;
+}
+
+
+/*
+ * Remove the registration for automatic connection of the specified channel
+ * when a partition comes up.
+ *
+ * Before returning this xpc_disconnect() will wait for all connections on the
+ * specified channel have been closed/torndown. So the caller can be assured
+ * that they will not be receiving any more callouts from XPC to their
+ * function registered via xpc_connect().
+ *
+ * Arguments:
+ *
+ *	ch_number - channel # to unregister.
+ */
+void
+xpc_disconnect(int ch_number)
+{
+	struct xpc_registration *registration;
+
+
+	DBUG_ON(ch_number < 0 || ch_number >= XPC_NCHANNELS);
+
+	registration = &xpc_registrations[ch_number];
+
+	/*
+	 * We've decided not to make this a down_interruptible(), since we
+	 * figured XPC's users will just turn around and call xpc_disconnect()
+	 * again anyways, so we might as well wait, if need be.
+	 */
+	down(&registration->sema);
+
+	/* if !XPC_CHANNEL_REGISTERED(ch_number) */
+	if (registration->func == NULL) {
+		up(&registration->sema);
+		return;
+	}
+
+	/* remove the connection registration for the specified channel */
+	registration->func = NULL;
+	registration->key = NULL;
+	registration->nentries = 0;
+	registration->msg_size = 0;
+	registration->assigned_limit = 0;
+	registration->idle_limit = 0;
+
+	xpc_interface.disconnect(ch_number);
+
+	up(&registration->sema);
+
+	return;
+}
+
+
+int __init
+xp_init(void)
+{
+	int ret, ch_number;
+	u64 func_addr = *(u64 *) xp_nofault_PIOR;
+	u64 err_func_addr = *(u64 *) xp_error_PIOR;
+
+
+	if (!ia64_platform_is("sn2")) {
+		return -ENODEV;
+	}
+
+	/*
+	 * Register a nofault code region which performs a cross-partition
+	 * PIO read. If the PIO read times out, the MCA handler will consume
+	 * the error and return to a kernel-provided instruction to indicate
+	 * an error. This PIO read exists because it is guaranteed to timeout
+	 * if the destination is down (AMO operations do not timeout on at
+	 * least some CPUs on Shubs <= v1.2, which unfortunately we have to
+	 * work around).
+	 */
+	if ((ret = sn_register_nofault_code(func_addr, err_func_addr,
+						err_func_addr, 1, 1)) != 0) {
+		printk(KERN_ERR "XP: can't register nofault code, error=%d\n",
+			ret);
+	}
+	/*
+	 * Setup the nofault PIO read target. (There is no special reason why
+	 * SH_IPI_ACCESS was selected.)
+	 */
+	if (is_shub2()) {
+		xp_nofault_PIOR_target = SH2_IPI_ACCESS0;
+	} else {
+		xp_nofault_PIOR_target = SH1_IPI_ACCESS;
+	}
+
+	/* initialize the connection registration semaphores */
+	for (ch_number = 0; ch_number < XPC_NCHANNELS; ch_number++) {
+		sema_init(&xpc_registrations[ch_number].sema, 1);  /* mutex */
+	}
+
+	return 0;
+}
+module_init(xp_init);
+
+
+void __exit
+xp_exit(void)
+{
+	u64 func_addr = *(u64 *) xp_nofault_PIOR;
+	u64 err_func_addr = *(u64 *) xp_error_PIOR;
+
+
+	/* unregister the PIO read nofault code region */
+	(void) sn_register_nofault_code(func_addr, err_func_addr,
+					err_func_addr, 1, 0);
+}
+module_exit(xp_exit);
+
+
+MODULE_AUTHOR("Silicon Graphics, Inc.");
+MODULE_DESCRIPTION("Cross Partition (XP) base");
+MODULE_LICENSE("GPL");
+
+EXPORT_SYMBOL(xp_nofault_PIOR);
+EXPORT_SYMBOL(xp_nofault_PIOR_target);
+EXPORT_SYMBOL(xpc_registrations);
+EXPORT_SYMBOL(xpc_interface);
+EXPORT_SYMBOL(xpc_clear_interface);
+EXPORT_SYMBOL(xpc_set_interface);
+EXPORT_SYMBOL(xpc_connect);
+EXPORT_SYMBOL(xpc_disconnect);
+

arch/ia64/sn/kernel/xp_nofault.S

@@ -0,0 +1,31 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 2004-2005 Silicon Graphics, Inc.  All Rights Reserved.
+ */
+
+
+/*
+ * The xp_nofault_PIOR function takes a pointer to a remote PIO register
+ * and attempts to load and consume a value from it.  This function
+ * will be registered as a nofault code block.  In the event that the
+ * PIO read fails, the MCA handler will force the error to look
+ * corrected and vector to the xp_error_PIOR which will return an error.
+ *
+ *	extern int xp_nofault_PIOR(void *remote_register);
+ */
+
+	.global xp_nofault_PIOR
+xp_nofault_PIOR:
+	mov	r8=r0			// Stage a success return value
+	ld8.acq	r9=[r32];;		// PIO Read the specified register
+	adds	r9=1,r9			// Add to force a consume
+	br.ret.sptk.many b0;;		// Return success
+
+	.global xp_error_PIOR
+xp_error_PIOR:
+	mov	r8=1			// Return value of 1
+	br.ret.sptk.many b0;;		// Return failure
+

arch/ia64/sn/kernel/xpc.h

@@ -0,0 +1,991 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 2004-2005 Silicon Graphics, Inc.  All Rights Reserved.
+ */
+
+
+/*
+ * Cross Partition Communication (XPC) structures and macros.
+ */
+
+#ifndef _IA64_SN_KERNEL_XPC_H
+#define _IA64_SN_KERNEL_XPC_H
+
+
+#include <linux/config.h>
+#include <linux/interrupt.h>
+#include <linux/sysctl.h>
+#include <linux/device.h>
+#include <asm/pgtable.h>
+#include <asm/processor.h>
+#include <asm/sn/bte.h>
+#include <asm/sn/clksupport.h>
+#include <asm/sn/addrs.h>
+#include <asm/sn/mspec.h>
+#include <asm/sn/shub_mmr.h>
+#include <asm/sn/xp.h>
+
+
+/*
+ * XPC Version numbers consist of a major and minor number. XPC can always
+ * talk to versions with same major #, and never talk to versions with a
+ * different major #.
+ */
+#define _XPC_VERSION(_maj, _min)	(((_maj) << 4) | ((_min) & 0xf))
+#define XPC_VERSION_MAJOR(_v)		((_v) >> 4)
+#define XPC_VERSION_MINOR(_v)		((_v) & 0xf)
+
+
+/*
+ * The next macros define word or bit representations for given
+ * C-brick nasid in either the SAL provided bit array representing
+ * nasids in the partition/machine or the AMO_t array used for
+ * inter-partition initiation communications.
+ *
+ * For SN2 machines, C-Bricks are alway even numbered NASIDs.  As
+ * such, some space will be saved by insisting that nasid information
+ * passed from SAL always be packed for C-Bricks and the
+ * cross-partition interrupts use the same packing scheme.
+ */
+#define XPC_NASID_W_INDEX(_n)	(((_n) / 64) / 2)
+#define XPC_NASID_B_INDEX(_n)	(((_n) / 2) & (64 - 1))
+#define XPC_NASID_IN_ARRAY(_n, _p) ((_p)[XPC_NASID_W_INDEX(_n)] & \
+				    (1UL << XPC_NASID_B_INDEX(_n)))
+#define XPC_NASID_FROM_W_B(_w, _b) (((_w) * 64 + (_b)) * 2)
+
+#define XPC_HB_DEFAULT_INTERVAL		5	/* incr HB every x secs */
+#define XPC_HB_CHECK_DEFAULT_TIMEOUT	20	/* check HB every x secs */
+
+/* define the process name of HB checker and the CPU it is pinned to */
+#define XPC_HB_CHECK_THREAD_NAME	"xpc_hb"
+#define XPC_HB_CHECK_CPU		0
+
+/* define the process name of the discovery thread */
+#define XPC_DISCOVERY_THREAD_NAME	"xpc_discovery"
+
+
+#define XPC_HB_ALLOWED(_p, _v)	((_v)->heartbeating_to_mask & (1UL << (_p)))
+#define XPC_ALLOW_HB(_p, _v)	(_v)->heartbeating_to_mask |= (1UL << (_p))
+#define XPC_DISALLOW_HB(_p, _v)	(_v)->heartbeating_to_mask &= (~(1UL << (_p)))
+
+
+/*
+ * Reserved Page provided by SAL.
+ *
+ * SAL provides one page per partition of reserved memory.  When SAL
+ * initialization is complete, SAL_signature, SAL_version, partid,
+ * part_nasids, and mach_nasids are set.
+ *
+ * Note: Until vars_pa is set, the partition XPC code has not been initialized.
+ */
+struct xpc_rsvd_page {
+	u64 SAL_signature;	/* SAL unique signature */
+	u64 SAL_version;	/* SAL specified version */
+	u8 partid;		/* partition ID from SAL */
+	u8 version;
+	u8 pad[6];		/* pad to u64 align */
+	u64 vars_pa;
+	u64 part_nasids[XP_NASID_MASK_WORDS] ____cacheline_aligned;
+	u64 mach_nasids[XP_NASID_MASK_WORDS] ____cacheline_aligned;
+};
+#define XPC_RP_VERSION _XPC_VERSION(1,0) /* version 1.0 of the reserved page */
+
+#define XPC_RSVD_PAGE_ALIGNED_SIZE \
+			(L1_CACHE_ALIGN(sizeof(struct xpc_rsvd_page)))
+
+
+/*
+ * Define the structures by which XPC variables can be exported to other
+ * partitions. (There are two: struct xpc_vars and struct xpc_vars_part)
+ */
+
+/*
+ * The following structure describes the partition generic variables
+ * needed by other partitions in order to properly initialize.
+ *
+ * struct xpc_vars version number also applies to struct xpc_vars_part.
+ * Changes to either structure and/or related functionality should be
+ * reflected by incrementing either the major or minor version numbers
+ * of struct xpc_vars.
+ */
+struct xpc_vars {
+	u8 version;
+	u64 heartbeat;
+	u64 heartbeating_to_mask;
+	u64 kdb_status;		/* 0 = machine running */
+	int act_nasid;
+	int act_phys_cpuid;
+	u64 vars_part_pa;
+	u64 amos_page_pa;	/* paddr of page of AMOs from MSPEC driver */
+	AMO_t *amos_page;	/* vaddr of page of AMOs from MSPEC driver */
+	AMO_t *act_amos;	/* pointer to the first activation AMO */
+};
+#define XPC_V_VERSION _XPC_VERSION(3,0) /* version 3.0 of the cross vars */
+
+#define XPC_VARS_ALIGNED_SIZE  (L1_CACHE_ALIGN(sizeof(struct xpc_vars)))
+
+/*
+ * The following structure describes the per partition specific variables.
+ *
+ * An array of these structures, one per partition, will be defined. As a
+ * partition becomes active XPC will copy the array entry corresponding to
+ * itself from that partition. It is desirable that the size of this
+ * structure evenly divide into a cacheline, such that none of the entries
+ * in this array crosses a cacheline boundary. As it is now, each entry
+ * occupies half a cacheline.
+ */
+struct xpc_vars_part {
+	u64 magic;
+
+	u64 openclose_args_pa;	/* physical address of open and close args */
+	u64 GPs_pa;		/* physical address of Get/Put values */
+
+	u64 IPI_amo_pa;		/* physical address of IPI AMO_t structure */
+	int IPI_nasid;		/* nasid of where to send IPIs */
+	int IPI_phys_cpuid;	/* physical CPU ID of where to send IPIs */
+
+	u8 nchannels;		/* #of defined channels supported */
+
+	u8 reserved[23];	/* pad to a full 64 bytes */
+};
+
+/*
+ * The vars_part MAGIC numbers play a part in the first contact protocol.
+ *
+ * MAGIC1 indicates that the per partition specific variables for a remote
+ * partition have been initialized by this partition.
+ *
+ * MAGIC2 indicates that this partition has pulled the remote partititions
+ * per partition variables that pertain to this partition.
+ */
+#define XPC_VP_MAGIC1	0x0053524156435058L  /* 'XPCVARS\0'L (little endian) */
+#define XPC_VP_MAGIC2	0x0073726176435058L  /* 'XPCvars\0'L (little endian) */
+
+
+
+/*
+ * Functions registered by add_timer() or called by kernel_thread() only
+ * allow for a single 64-bit argument. The following macros can be used to
+ * pack and unpack two (32-bit, 16-bit or 8-bit) arguments into or out from
+ * the passed argument.
+ */
+#define XPC_PACK_ARGS(_arg1, _arg2) \
+			((((u64) _arg1) & 0xffffffff) | \
+			((((u64) _arg2) & 0xffffffff) << 32))
+
+#define XPC_UNPACK_ARG1(_args)	(((u64) _args) & 0xffffffff)
+#define XPC_UNPACK_ARG2(_args)	((((u64) _args) >> 32) & 0xffffffff)
+
+
+
+/*
+ * Define a Get/Put value pair (pointers) used with a message queue.
+ */
+struct xpc_gp {
+	s64 get;	/* Get value */
+	s64 put;	/* Put value */
+};
+
+#define XPC_GP_SIZE \
+		L1_CACHE_ALIGN(sizeof(struct xpc_gp) * XPC_NCHANNELS)
+
+
+
+/*
+ * Define a structure that contains arguments associated with opening and
+ * closing a channel.
+ */
+struct xpc_openclose_args {
+	u16 reason;		/* reason why channel is closing */
+	u16 msg_size;		/* sizeof each message entry */
+	u16 remote_nentries;	/* #of message entries in remote msg queue */
+	u16 local_nentries;	/* #of message entries in local msg queue */
+	u64 local_msgqueue_pa;	/* physical address of local message queue */
+};
+
+#define XPC_OPENCLOSE_ARGS_SIZE \
+	      L1_CACHE_ALIGN(sizeof(struct xpc_openclose_args) * XPC_NCHANNELS)
+
+
+
+/* struct xpc_msg flags */
+
+#define	XPC_M_DONE		0x01	/* msg has been received/consumed */
+#define	XPC_M_READY		0x02	/* msg is ready to be sent */
+#define	XPC_M_INTERRUPT		0x04	/* send interrupt when msg consumed */
+
+
+#define XPC_MSG_ADDRESS(_payload) \
+		((struct xpc_msg *)((u8 *)(_payload) - XPC_MSG_PAYLOAD_OFFSET))
+
+
+
+/*
+ * Defines notify entry.
+ *
+ * This is used to notify a message's sender that their message was received
+ * and consumed by the intended recipient.
+ */
+struct xpc_notify {
+	struct semaphore sema;		/* notify semaphore */
+	u8 type;			/* type of notification */
+
+	/* the following two fields are only used if type == XPC_N_CALL */
+	xpc_notify_func func;		/* user's notify function */
+	void *key;			/* pointer to user's key */
+};
+
+/* struct xpc_notify type of notification */
+
+#define	XPC_N_CALL		0x01	/* notify function provided by user */
+
+
+
+/*
+ * Define the structure that manages all the stuff required by a channel. In
+ * particular, they are used to manage the messages sent across the channel.
+ *
+ * This structure is private to a partition, and is NOT shared across the
+ * partition boundary.
+ *
+ * There is an array of these structures for each remote partition. It is
+ * allocated at the time a partition becomes active. The array contains one
+ * of these structures for each potential channel connection to that partition.
+ *
+ * Each of these structures manages two message queues (circular buffers).
+ * They are allocated at the time a channel connection is made. One of
+ * these message queues (local_msgqueue) holds the locally created messages
+ * that are destined for the remote partition. The other of these message
+ * queues (remote_msgqueue) is a locally cached copy of the remote partition's
+ * own local_msgqueue.
+ *
+ * The following is a description of the Get/Put pointers used to manage these
+ * two message queues. Consider the local_msgqueue to be on one partition
+ * and the remote_msgqueue to be its cached copy on another partition. A
+ * description of what each of the lettered areas contains is included.
+ *
+ *
+ *                     local_msgqueue      remote_msgqueue
+ *
+ *                        |/////////|      |/////////|
+ *    w_remote_GP.get --> +---------+      |/////////|
+ *                        |    F    |      |/////////|
+ *     remote_GP.get  --> +---------+      +---------+ <-- local_GP->get
+ *                        |         |      |         |
+ *                        |         |      |    E    |
+ *                        |         |      |         |
+ *                        |         |      +---------+ <-- w_local_GP.get
+ *                        |    B    |      |/////////|
+ *                        |         |      |////D////|
+ *                        |         |      |/////////|
+ *                        |         |      +---------+ <-- w_remote_GP.put
+ *                        |         |      |////C////|
+ *      local_GP->put --> +---------+      +---------+ <-- remote_GP.put
+ *                        |         |      |/////////|
+ *                        |    A    |      |/////////|
+ *                        |         |      |/////////|
+ *     w_local_GP.put --> +---------+      |/////////|
+ *                        |/////////|      |/////////|
+ *
+ *
+ *	    ( remote_GP.[get|put] are cached copies of the remote
+ *	      partition's local_GP->[get|put], and thus their values can
+ *	      lag behind their counterparts on the remote partition. )
+ *
+ *
+ *  A - Messages that have been allocated, but have not yet been sent to the
+ *	remote partition.
+ *
+ *  B - Messages that have been sent, but have not yet been acknowledged by the
+ *      remote partition as having been received.
+ *
+ *  C - Area that needs to be prepared for the copying of sent messages, by
+ *	the clearing of the message flags of any previously received messages.
+ *
+ *  D - Area into which sent messages are to be copied from the remote
+ *	partition's local_msgqueue and then delivered to their intended
+ *	recipients. [ To allow for a multi-message copy, another pointer
+ *	(next_msg_to_pull) has been added to keep track of the next message
+ *	number needing to be copied (pulled). It chases after w_remote_GP.put.
+ *	Any messages lying between w_local_GP.get and next_msg_to_pull have
+ *	been copied and are ready to be delivered. ]
+ *
+ *  E - Messages that have been copied and delivered, but have not yet been
+ *	acknowledged by the recipient as having been received.
+ *
+ *  F - Messages that have been acknowledged, but XPC has not yet notified the
+ *	sender that the message was received by its intended recipient.
+ *	This is also an area that needs to be prepared for the allocating of
+ *	new messages, by the clearing of the message flags of the acknowledged
+ *	messages.
+ */
+struct xpc_channel {
+	partid_t partid;		/* ID of remote partition connected */
+	spinlock_t lock;		/* lock for updating this structure */
+	u32 flags;			/* general flags */
+
+	enum xpc_retval reason;		/* reason why channel is disconnect'g */
+	int reason_line;		/* line# disconnect initiated from */
+
+	u16 number;			/* channel # */
+
+	u16 msg_size;			/* sizeof each msg entry */
+	u16 local_nentries;		/* #of msg entries in local msg queue */
+	u16 remote_nentries;		/* #of msg entries in remote msg queue*/
+
+	void *local_msgqueue_base;	/* base address of kmalloc'd space */
+	struct xpc_msg *local_msgqueue;	/* local message queue */
+	void *remote_msgqueue_base;	/* base address of kmalloc'd space */
+	struct xpc_msg *remote_msgqueue;/* cached copy of remote partition's */
+					/* local message queue */
+	u64 remote_msgqueue_pa;		/* phys addr of remote partition's */
+					/* local message queue */
+
+	atomic_t references;		/* #of external references to queues */
+
+	atomic_t n_on_msg_allocate_wq;   /* #on msg allocation wait queue */
+	wait_queue_head_t msg_allocate_wq; /* msg allocation wait queue */
+
+	/* queue of msg senders who want to be notified when msg received */
+
+	atomic_t n_to_notify;		/* #of msg senders to notify */
+	struct xpc_notify *notify_queue;/* notify queue for messages sent */
+
+	xpc_channel_func func;		/* user's channel function */
+	void *key;			/* pointer to user's key */
+
+	struct semaphore msg_to_pull_sema; /* next msg to pull serialization */
+	struct semaphore teardown_sema;    /* wait for teardown completion */
+
+	struct xpc_openclose_args *local_openclose_args; /* args passed on */
+					/* opening or closing of channel */
+
+	/* various flavors of local and remote Get/Put values */
+
+	struct xpc_gp *local_GP;	/* local Get/Put values */
+	struct xpc_gp remote_GP;	/* remote Get/Put values */
+	struct xpc_gp w_local_GP;	/* working local Get/Put values */
+	struct xpc_gp w_remote_GP;	/* working remote Get/Put values */
+	s64 next_msg_to_pull;		/* Put value of next msg to pull */
+
+	/* kthread management related fields */
+
+// >>> rethink having kthreads_assigned_limit and kthreads_idle_limit; perhaps
+// >>> allow the assigned limit be unbounded and let the idle limit be dynamic
+// >>> dependent on activity over the last interval of time
+	atomic_t kthreads_assigned;	/* #of kthreads assigned to channel */
+	u32 kthreads_assigned_limit; 	/* limit on #of kthreads assigned */
+	atomic_t kthreads_idle;		/* #of kthreads idle waiting for work */
+	u32 kthreads_idle_limit;	/* limit on #of kthreads idle */
+	atomic_t kthreads_active;	/* #of kthreads actively working */
+	// >>> following field is temporary
+	u32 kthreads_created;		/* total #of kthreads created */
+
+	wait_queue_head_t idle_wq;	/* idle kthread wait queue */
+
+} ____cacheline_aligned;
+
+
+/* struct xpc_channel flags */
+
+#define	XPC_C_WASCONNECTED	0x00000001 /* channel was connected */
+
+#define	XPC_C_ROPENREPLY	0x00000002 /* remote open channel reply */
+#define	XPC_C_OPENREPLY		0x00000004 /* local open channel reply */
+#define	XPC_C_ROPENREQUEST	0x00000008 /* remote open channel request */
+#define	XPC_C_OPENREQUEST	0x00000010 /* local open channel request */
+
+#define	XPC_C_SETUP		0x00000020 /* channel's msgqueues are alloc'd */
+#define	XPC_C_CONNECTCALLOUT	0x00000040 /* channel connected callout made */
+#define	XPC_C_CONNECTED		0x00000080 /* local channel is connected */
+#define	XPC_C_CONNECTING	0x00000100 /* channel is being connected */
+
+#define	XPC_C_RCLOSEREPLY	0x00000200 /* remote close channel reply */
+#define	XPC_C_CLOSEREPLY	0x00000400 /* local close channel reply */
+#define	XPC_C_RCLOSEREQUEST	0x00000800 /* remote close channel request */
+#define	XPC_C_CLOSEREQUEST	0x00001000 /* local close channel request */
+
+#define	XPC_C_DISCONNECTED	0x00002000 /* channel is disconnected */
+#define	XPC_C_DISCONNECTING	0x00004000 /* channel is being disconnected */
+
+
+
+/*
+ * Manages channels on a partition basis. There is one of these structures
+ * for each partition (a partition will never utilize the structure that
+ * represents itself).
+ */
+struct xpc_partition {
+
+	/* XPC HB infrastructure */
+
+	u64 remote_rp_pa;		/* phys addr of partition's rsvd pg */
+	u64 remote_vars_pa;		/* phys addr of partition's vars */
+	u64 remote_vars_part_pa;	/* phys addr of partition's vars part */
+	u64 last_heartbeat;		/* HB at last read */
+	u64 remote_amos_page_pa;	/* phys addr of partition's amos page */
+	int remote_act_nasid;		/* active part's act/deact nasid */
+	int remote_act_phys_cpuid;	/* active part's act/deact phys cpuid */
+	u32 act_IRQ_rcvd;		/* IRQs since activation */
+	spinlock_t act_lock;		/* protect updating of act_state */
+	u8 act_state;			/* from XPC HB viewpoint */
+	enum xpc_retval reason;		/* reason partition is deactivating */
+	int reason_line;		/* line# deactivation initiated from */
+	int reactivate_nasid;		/* nasid in partition to reactivate */
+
+
+	/* XPC infrastructure referencing and teardown control */
+
+	u8 setup_state;			/* infrastructure setup state */
+	wait_queue_head_t teardown_wq;	/* kthread waiting to teardown infra */
+	atomic_t references;		/* #of references to infrastructure */
+
+
+	/*
+	 * NONE OF THE PRECEDING FIELDS OF THIS STRUCTURE WILL BE CLEARED WHEN
+	 * XPC SETS UP THE NECESSARY INFRASTRUCTURE TO SUPPORT CROSS PARTITION
+	 * COMMUNICATION. ALL OF THE FOLLOWING FIELDS WILL BE CLEARED. (THE
+	 * 'nchannels' FIELD MUST BE THE FIRST OF THE FIELDS TO BE CLEARED.)
+	 */
+
+
+	u8 nchannels;		   /* #of defined channels supported */
+	atomic_t nchannels_active; /* #of channels that are not DISCONNECTED */
+	struct xpc_channel *channels;/* array of channel structures */
+
+	void *local_GPs_base;	  /* base address of kmalloc'd space */
+	struct xpc_gp *local_GPs; /* local Get/Put values */
+	void *remote_GPs_base;    /* base address of kmalloc'd space */
+	struct xpc_gp *remote_GPs;/* copy of remote partition's local Get/Put */
+				  /* values */
+	u64 remote_GPs_pa;	  /* phys address of remote partition's local */
+				  /* Get/Put values */
+
+
+	/* fields used to pass args when opening or closing a channel */
+
+	void *local_openclose_args_base;  /* base address of kmalloc'd space */
+	struct xpc_openclose_args *local_openclose_args;  /* local's args */
+	void *remote_openclose_args_base; /* base address of kmalloc'd space */
+	struct xpc_openclose_args *remote_openclose_args; /* copy of remote's */
+					  /* args */
+	u64 remote_openclose_args_pa;	  /* phys addr of remote's args */
+
+
+	/* IPI sending, receiving and handling related fields */
+
+	int remote_IPI_nasid;	    /* nasid of where to send IPIs */
+	int remote_IPI_phys_cpuid;  /* phys CPU ID of where to send IPIs */
+	AMO_t *remote_IPI_amo_va;   /* address of remote IPI AMO_t structure */
+
+	AMO_t *local_IPI_amo_va;    /* address of IPI AMO_t structure */
+	u64 local_IPI_amo;	    /* IPI amo flags yet to be handled */
+	char IPI_owner[8];	    /* IPI owner's name */
+	struct timer_list dropped_IPI_timer; /* dropped IPI timer */
+
+	spinlock_t IPI_lock;	    /* IPI handler lock */
+
+
+	/* channel manager related fields */
+
+	atomic_t channel_mgr_requests;	/* #of requests to activate chan mgr */
+	wait_queue_head_t channel_mgr_wq; /* channel mgr's wait queue */
+
+} ____cacheline_aligned;
+
+
+/* struct xpc_partition act_state values (for XPC HB) */
+
+#define	XPC_P_INACTIVE		0x00	/* partition is not active */
+#define XPC_P_ACTIVATION_REQ	0x01	/* created thread to activate */
+#define XPC_P_ACTIVATING	0x02	/* activation thread started */
+#define XPC_P_ACTIVE		0x03	/* xpc_partition_up() was called */
+#define XPC_P_DEACTIVATING	0x04	/* partition deactivation initiated */
+
+
+#define XPC_DEACTIVATE_PARTITION(_p, _reason) \
+			xpc_deactivate_partition(__LINE__, (_p), (_reason))
+
+
+/* struct xpc_partition setup_state values */
+
+#define XPC_P_UNSET		0x00	/* infrastructure was never setup */
+#define XPC_P_SETUP		0x01	/* infrastructure is setup */
+#define XPC_P_WTEARDOWN		0x02	/* waiting to teardown infrastructure */
+#define XPC_P_TORNDOWN		0x03	/* infrastructure is torndown */
+
+
+/*
+ * struct xpc_partition IPI_timer #of seconds to wait before checking for
+ * dropped IPIs. These occur whenever an IPI amo write doesn't complete until
+ * after the IPI was received.
+ */
+#define XPC_P_DROPPED_IPI_WAIT	(0.25 * HZ)
+
+
+#define XPC_PARTID(_p)	((partid_t) ((_p) - &xpc_partitions[0]))
+
+
+
+/* found in xp_main.c */
+extern struct xpc_registration xpc_registrations[];
+
+
+/* >>> found in xpc_main.c only */
+extern struct device *xpc_part;
+extern struct device *xpc_chan;
+extern irqreturn_t xpc_notify_IRQ_handler(int, void *, struct pt_regs *);
+extern void xpc_dropped_IPI_check(struct xpc_partition *);
+extern void xpc_activate_kthreads(struct xpc_channel *, int);
+extern void xpc_create_kthreads(struct xpc_channel *, int);
+extern void xpc_disconnect_wait(int);
+
+
+/* found in xpc_main.c and efi-xpc.c */
+extern void xpc_activate_partition(struct xpc_partition *);
+
+
+/* found in xpc_partition.c */
+extern int xpc_exiting;
+extern int xpc_hb_interval;
+extern int xpc_hb_check_interval;
+extern struct xpc_vars *xpc_vars;
+extern struct xpc_rsvd_page *xpc_rsvd_page;
+extern struct xpc_vars_part *xpc_vars_part;
+extern struct xpc_partition xpc_partitions[XP_MAX_PARTITIONS + 1];
+extern char xpc_remote_copy_buffer[];
+extern struct xpc_rsvd_page *xpc_rsvd_page_init(void);
+extern void xpc_allow_IPI_ops(void);
+extern void xpc_restrict_IPI_ops(void);
+extern int xpc_identify_act_IRQ_sender(void);
+extern enum xpc_retval xpc_mark_partition_active(struct xpc_partition *);
+extern void xpc_mark_partition_inactive(struct xpc_partition *);
+extern void xpc_discovery(void);
+extern void xpc_check_remote_hb(void);
+extern void xpc_deactivate_partition(const int, struct xpc_partition *,
+						enum xpc_retval);
+extern enum xpc_retval xpc_initiate_partid_to_nasids(partid_t, void *);
+
+
+/* found in xpc_channel.c */
+extern void xpc_initiate_connect(int);
+extern void xpc_initiate_disconnect(int);
+extern enum xpc_retval xpc_initiate_allocate(partid_t, int, u32, void **);
+extern enum xpc_retval xpc_initiate_send(partid_t, int, void *);
+extern enum xpc_retval xpc_initiate_send_notify(partid_t, int, void *,
+						xpc_notify_func, void *);
+extern void xpc_initiate_received(partid_t, int, void *);
+extern enum xpc_retval xpc_setup_infrastructure(struct xpc_partition *);
+extern enum xpc_retval xpc_pull_remote_vars_part(struct xpc_partition *);
+extern void xpc_process_channel_activity(struct xpc_partition *);
+extern void xpc_connected_callout(struct xpc_channel *);
+extern void xpc_deliver_msg(struct xpc_channel *);
+extern void xpc_disconnect_channel(const int, struct xpc_channel *,
+					enum xpc_retval, unsigned long *);
+extern void xpc_disconnected_callout(struct xpc_channel *);
+extern void xpc_partition_down(struct xpc_partition *, enum xpc_retval);
+extern void xpc_teardown_infrastructure(struct xpc_partition *);
+
+
+
+static inline void
+xpc_wakeup_channel_mgr(struct xpc_partition *part)
+{
+	if (atomic_inc_return(&part->channel_mgr_requests) == 1) {
+		wake_up(&part->channel_mgr_wq);
+	}
+}
+
+
+
+/*
+ * These next two inlines are used to keep us from tearing down a channel's
+ * msg queues while a thread may be referencing them.
+ */
+static inline void
+xpc_msgqueue_ref(struct xpc_channel *ch)
+{
+	atomic_inc(&ch->references);
+}
+
+static inline void
+xpc_msgqueue_deref(struct xpc_channel *ch)
+{
+	s32 refs = atomic_dec_return(&ch->references);
+
+	DBUG_ON(refs < 0);
+	if (refs == 0) {
+		xpc_wakeup_channel_mgr(&xpc_partitions[ch->partid]);
+	}
+}
+
+
+
+#define XPC_DISCONNECT_CHANNEL(_ch, _reason, _irqflgs) \
+		xpc_disconnect_channel(__LINE__, _ch, _reason, _irqflgs)
+
+
+/*
+ * These two inlines are used to keep us from tearing down a partition's
+ * setup infrastructure while a thread may be referencing it.
+ */
+static inline void
+xpc_part_deref(struct xpc_partition *part)
+{
+	s32 refs = atomic_dec_return(&part->references);
+
+
+	DBUG_ON(refs < 0);
+	if (refs == 0 && part->setup_state == XPC_P_WTEARDOWN) {
+		wake_up(&part->teardown_wq);
+	}
+}
+
+static inline int
+xpc_part_ref(struct xpc_partition *part)
+{
+	int setup;
+
+
+	atomic_inc(&part->references);
+	setup = (part->setup_state == XPC_P_SETUP);
+	if (!setup) {
+		xpc_part_deref(part);
+	}
+	return setup;
+}
+
+
+
+/*
+ * The following macro is to be used for the setting of the reason and
+ * reason_line fields in both the struct xpc_channel and struct xpc_partition
+ * structures.
+ */
+#define XPC_SET_REASON(_p, _reason, _line) \
+	{ \
+		(_p)->reason = _reason; \
+		(_p)->reason_line = _line; \
+	}
+
+
+
+/*
+ * The following set of macros and inlines are used for the sending and
+ * receiving of IPIs (also known as IRQs). There are two flavors of IPIs,
+ * one that is associated with partition activity (SGI_XPC_ACTIVATE) and
+ * the other that is associated with channel activity (SGI_XPC_NOTIFY).
+ */
+
+static inline u64
+xpc_IPI_receive(AMO_t *amo)
+{
+	return FETCHOP_LOAD_OP(TO_AMO((u64) &amo->variable), FETCHOP_CLEAR);
+}
+
+
+static inline enum xpc_retval
+xpc_IPI_send(AMO_t *amo, u64 flag, int nasid, int phys_cpuid, int vector)
+{
+	int ret = 0;
+	unsigned long irq_flags;
+
+
+	local_irq_save(irq_flags);
+
+	FETCHOP_STORE_OP(TO_AMO((u64) &amo->variable), FETCHOP_OR, flag);
+	sn_send_IPI_phys(nasid, phys_cpuid, vector, 0);
+
+	/*
+	 * We must always use the nofault function regardless of whether we
+	 * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we
+	 * didn't, we'd never know that the other partition is down and would
+	 * keep sending IPIs and AMOs to it until the heartbeat times out.
+	 */
+	ret = xp_nofault_PIOR((u64 *) GLOBAL_MMR_ADDR(NASID_GET(&amo->variable),
+				xp_nofault_PIOR_target));
+
+	local_irq_restore(irq_flags);
+
+	return ((ret == 0) ? xpcSuccess : xpcPioReadError);
+}
+
+
+/*
+ * IPIs associated with SGI_XPC_ACTIVATE IRQ.
+ */
+
+/*
+ * Flag the appropriate AMO variable and send an IPI to the specified node.
+ */
+static inline void
+xpc_activate_IRQ_send(u64 amos_page, int from_nasid, int to_nasid,
+			int to_phys_cpuid)
+{
+	int w_index = XPC_NASID_W_INDEX(from_nasid);
+	int b_index = XPC_NASID_B_INDEX(from_nasid);
+	AMO_t *amos = (AMO_t *) __va(amos_page +
+					(XP_MAX_PARTITIONS * sizeof(AMO_t)));
+
+
+	(void) xpc_IPI_send(&amos[w_index], (1UL << b_index), to_nasid,
+				to_phys_cpuid, SGI_XPC_ACTIVATE);
+}
+
+static inline void
+xpc_IPI_send_activate(struct xpc_vars *vars)
+{
+	xpc_activate_IRQ_send(vars->amos_page_pa, cnodeid_to_nasid(0),
+				vars->act_nasid, vars->act_phys_cpuid);
+}
+
+static inline void
+xpc_IPI_send_activated(struct xpc_partition *part)
+{
+	xpc_activate_IRQ_send(part->remote_amos_page_pa, cnodeid_to_nasid(0),
+			part->remote_act_nasid, part->remote_act_phys_cpuid);
+}
+
+static inline void
+xpc_IPI_send_reactivate(struct xpc_partition *part)
+{
+	xpc_activate_IRQ_send(xpc_vars->amos_page_pa, part->reactivate_nasid,
+				xpc_vars->act_nasid, xpc_vars->act_phys_cpuid);
+}
+
+
+/*
+ * IPIs associated with SGI_XPC_NOTIFY IRQ.
+ */
+
+/*
+ * Send an IPI to the remote partition that is associated with the
+ * specified channel.
+ */
+#define XPC_NOTIFY_IRQ_SEND(_ch, _ipi_f, _irq_f) \
+		xpc_notify_IRQ_send(_ch, _ipi_f, #_ipi_f, _irq_f)
+
+static inline void
+xpc_notify_IRQ_send(struct xpc_channel *ch, u8 ipi_flag, char *ipi_flag_string,
+			unsigned long *irq_flags)
+{
+	struct xpc_partition *part = &xpc_partitions[ch->partid];
+	enum xpc_retval ret;
+
+
+	if (likely(part->act_state != XPC_P_DEACTIVATING)) {
+		ret = xpc_IPI_send(part->remote_IPI_amo_va,
+					(u64) ipi_flag << (ch->number * 8),
+					part->remote_IPI_nasid,
+					part->remote_IPI_phys_cpuid,
+					SGI_XPC_NOTIFY);
+		dev_dbg(xpc_chan, "%s sent to partid=%d, channel=%d, ret=%d\n",
+			ipi_flag_string, ch->partid, ch->number, ret);
+		if (unlikely(ret != xpcSuccess)) {
+			if (irq_flags != NULL) {
+				spin_unlock_irqrestore(&ch->lock, *irq_flags);
+			}
+			XPC_DEACTIVATE_PARTITION(part, ret);
+			if (irq_flags != NULL) {
+				spin_lock_irqsave(&ch->lock, *irq_flags);
+			}
+		}
+	}
+}
+
+
+/*
+ * Make it look like the remote partition, which is associated with the
+ * specified channel, sent us an IPI. This faked IPI will be handled
+ * by xpc_dropped_IPI_check().
+ */
+#define XPC_NOTIFY_IRQ_SEND_LOCAL(_ch, _ipi_f) \
+		xpc_notify_IRQ_send_local(_ch, _ipi_f, #_ipi_f)
+
+static inline void
+xpc_notify_IRQ_send_local(struct xpc_channel *ch, u8 ipi_flag,
+				char *ipi_flag_string)
+{
+	struct xpc_partition *part = &xpc_partitions[ch->partid];
+
+
+	FETCHOP_STORE_OP(TO_AMO((u64) &part->local_IPI_amo_va->variable),
+			FETCHOP_OR, ((u64) ipi_flag << (ch->number * 8)));
+	dev_dbg(xpc_chan, "%s sent local from partid=%d, channel=%d\n",
+		ipi_flag_string, ch->partid, ch->number);
+}
+
+
+/*
+ * The sending and receiving of IPIs includes the setting of an AMO variable
+ * to indicate the reason the IPI was sent. The 64-bit variable is divided
+ * up into eight bytes, ordered from right to left. Byte zero pertains to
+ * channel 0, byte one to channel 1, and so on. Each byte is described by
+ * the following IPI flags.
+ */
+
+#define	XPC_IPI_CLOSEREQUEST	0x01
+#define	XPC_IPI_CLOSEREPLY	0x02
+#define	XPC_IPI_OPENREQUEST	0x04
+#define	XPC_IPI_OPENREPLY	0x08
+#define	XPC_IPI_MSGREQUEST	0x10
+
+
+/* given an AMO variable and a channel#, get its associated IPI flags */
+#define XPC_GET_IPI_FLAGS(_amo, _c)	((u8) (((_amo) >> ((_c) * 8)) & 0xff))
+
+#define	XPC_ANY_OPENCLOSE_IPI_FLAGS_SET(_amo) ((_amo) & 0x0f0f0f0f0f0f0f0f)
+#define XPC_ANY_MSG_IPI_FLAGS_SET(_amo)       ((_amo) & 0x1010101010101010)
+
+
+static inline void
+xpc_IPI_send_closerequest(struct xpc_channel *ch, unsigned long *irq_flags)
+{
+	struct xpc_openclose_args *args = ch->local_openclose_args;
+
+
+	args->reason = ch->reason;
+
+	XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_CLOSEREQUEST, irq_flags);
+}
+
+static inline void
+xpc_IPI_send_closereply(struct xpc_channel *ch, unsigned long *irq_flags)
+{
+	XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_CLOSEREPLY, irq_flags);
+}
+
+static inline void
+xpc_IPI_send_openrequest(struct xpc_channel *ch, unsigned long *irq_flags)
+{
+	struct xpc_openclose_args *args = ch->local_openclose_args;
+
+
+	args->msg_size = ch->msg_size;
+	args->local_nentries = ch->local_nentries;
+
+	XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_OPENREQUEST, irq_flags);
+}
+
+static inline void
+xpc_IPI_send_openreply(struct xpc_channel *ch, unsigned long *irq_flags)
+{
+	struct xpc_openclose_args *args = ch->local_openclose_args;
+
+
+	args->remote_nentries = ch->remote_nentries;
+	args->local_nentries = ch->local_nentries;
+	args->local_msgqueue_pa = __pa(ch->local_msgqueue);
+
+	XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_OPENREPLY, irq_flags);
+}
+
+static inline void
+xpc_IPI_send_msgrequest(struct xpc_channel *ch)
+{
+	XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_MSGREQUEST, NULL);
+}
+
+static inline void
+xpc_IPI_send_local_msgrequest(struct xpc_channel *ch)
+{
+	XPC_NOTIFY_IRQ_SEND_LOCAL(ch, XPC_IPI_MSGREQUEST);
+}
+
+
+/*
+ * Memory for XPC's AMO variables is allocated by the MSPEC driver. These
+ * pages are located in the lowest granule. The lowest granule uses 4k pages
+ * for cached references and an alternate TLB handler to never provide a
+ * cacheable mapping for the entire region. This will prevent speculative
+ * reading of cached copies of our lines from being issued which will cause
+ * a PI FSB Protocol error to be generated by the SHUB. For XPC, we need 64
+ * (XP_MAX_PARTITIONS) AMO variables for message notification (xpc_main.c)
+ * and an additional 16 AMO variables for partition activation (xpc_hb.c).
+ */
+static inline AMO_t *
+xpc_IPI_init(partid_t partid)
+{
+	AMO_t *part_amo = xpc_vars->amos_page + partid;
+
+
+	xpc_IPI_receive(part_amo);
+	return part_amo;
+}
+
+
+
+static inline enum xpc_retval
+xpc_map_bte_errors(bte_result_t error)
+{
+	switch (error) {
+	case BTE_SUCCESS:	return xpcSuccess;
+	case BTEFAIL_DIR:	return xpcBteDirectoryError;
+	case BTEFAIL_POISON:	return xpcBtePoisonError;
+	case BTEFAIL_WERR:	return xpcBteWriteError;
+	case BTEFAIL_ACCESS:	return xpcBteAccessError;
+	case BTEFAIL_PWERR:	return xpcBtePWriteError;
+	case BTEFAIL_PRERR:	return xpcBtePReadError;
+	case BTEFAIL_TOUT:	return xpcBteTimeOutError;
+	case BTEFAIL_XTERR:	return xpcBteXtalkError;
+	case BTEFAIL_NOTAVAIL:	return xpcBteNotAvailable;
+	default:		return xpcBteUnmappedError;
+	}
+}
+
+
+
+static inline void *
+xpc_kmalloc_cacheline_aligned(size_t size, int flags, void **base)
+{
+	/* see if kmalloc will give us cachline aligned memory by default */
+	*base = kmalloc(size, flags);
+	if (*base == NULL) {
+		return NULL;
+	}
+	if ((u64) *base == L1_CACHE_ALIGN((u64) *base)) {
+		return *base;
+	}
+	kfree(*base);
+
+	/* nope, we'll have to do it ourselves */
+	*base = kmalloc(size + L1_CACHE_BYTES, flags);
+	if (*base == NULL) {
+		return NULL;
+	}
+	return (void *) L1_CACHE_ALIGN((u64) *base);
+}
+
+
+/*
+ * Check to see if there is any channel activity to/from the specified
+ * partition.
+ */
+static inline void
+xpc_check_for_channel_activity(struct xpc_partition *part)
+{
+	u64 IPI_amo;
+	unsigned long irq_flags;
+
+
+	IPI_amo = xpc_IPI_receive(part->local_IPI_amo_va);
+	if (IPI_amo == 0) {
+		return;
+	}
+
+	spin_lock_irqsave(&part->IPI_lock, irq_flags);
+	part->local_IPI_amo |= IPI_amo;
+	spin_unlock_irqrestore(&part->IPI_lock, irq_flags);
+
+	dev_dbg(xpc_chan, "received IPI from partid=%d, IPI_amo=0x%lx\n",
+		XPC_PARTID(part), IPI_amo);
+
+	xpc_wakeup_channel_mgr(part);
+}
+
+
+#endif /* _IA64_SN_KERNEL_XPC_H */
+

arch/ia64/sn/kernel/xpc_channel.c

@@ -0,0 +1,2297 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 2004-2005 Silicon Graphics, Inc.  All Rights Reserved.
+ */
+
+
+/*
+ * Cross Partition Communication (XPC) channel support.
+ *
+ *	This is the part of XPC that manages the channels and
+ *	sends/receives messages across them to/from other partitions.
+ *
+ */
+
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/cache.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <asm/sn/bte.h>
+#include <asm/sn/sn_sal.h>
+#include "xpc.h"
+
+
+/*
+ * Set up the initial values for the XPartition Communication channels.
+ */
+static void
+xpc_initialize_channels(struct xpc_partition *part, partid_t partid)
+{
+	int ch_number;
+	struct xpc_channel *ch;
+
+
+	for (ch_number = 0; ch_number < part->nchannels; ch_number++) {
+		ch = &part->channels[ch_number];
+
+		ch->partid = partid;
+		ch->number = ch_number;
+		ch->flags = XPC_C_DISCONNECTED;
+
+		ch->local_GP = &part->local_GPs[ch_number];
+		ch->local_openclose_args =
+					&part->local_openclose_args[ch_number];
+
+		atomic_set(&ch->kthreads_assigned, 0);
+		atomic_set(&ch->kthreads_idle, 0);
+		atomic_set(&ch->kthreads_active, 0);
+
+		atomic_set(&ch->references, 0);
+		atomic_set(&ch->n_to_notify, 0);
+
+		spin_lock_init(&ch->lock);
+		sema_init(&ch->msg_to_pull_sema, 1);	/* mutex */
+
+		atomic_set(&ch->n_on_msg_allocate_wq, 0);
+		init_waitqueue_head(&ch->msg_allocate_wq);
+		init_waitqueue_head(&ch->idle_wq);
+	}
+}
+
+
+/*
+ * Setup the infrastructure necessary to support XPartition Communication
+ * between the specified remote partition and the local one.
+ */
+enum xpc_retval
+xpc_setup_infrastructure(struct xpc_partition *part)
+{
+	int ret;
+	struct timer_list *timer;
+	partid_t partid = XPC_PARTID(part);
+
+
+	/*
+	 * Zero out MOST of the entry for this partition. Only the fields
+	 * starting with `nchannels' will be zeroed. The preceding fields must
+	 * remain `viable' across partition ups and downs, since they may be
+	 * referenced during this memset() operation.
+	 */
+	memset(&part->nchannels, 0, sizeof(struct xpc_partition) -
+				offsetof(struct xpc_partition, nchannels));
+
+	/*
+	 * Allocate all of the channel structures as a contiguous chunk of
+	 * memory.
+	 */
+	part->channels = kmalloc(sizeof(struct xpc_channel) * XPC_NCHANNELS,
+								GFP_KERNEL);
+	if (part->channels == NULL) {
+		dev_err(xpc_chan, "can't get memory for channels\n");
+		return xpcNoMemory;
+	}
+	memset(part->channels, 0, sizeof(struct xpc_channel) * XPC_NCHANNELS);
+
+	part->nchannels = XPC_NCHANNELS;
+
+
+	/* allocate all the required GET/PUT values */
+
+	part->local_GPs = xpc_kmalloc_cacheline_aligned(XPC_GP_SIZE,
+					GFP_KERNEL, &part->local_GPs_base);
+	if (part->local_GPs == NULL) {
+		kfree(part->channels);
+		part->channels = NULL;
+		dev_err(xpc_chan, "can't get memory for local get/put "
+			"values\n");
+		return xpcNoMemory;
+	}
+	memset(part->local_GPs, 0, XPC_GP_SIZE);
+
+	part->remote_GPs = xpc_kmalloc_cacheline_aligned(XPC_GP_SIZE,
+					GFP_KERNEL, &part->remote_GPs_base);
+	if (part->remote_GPs == NULL) {
+		kfree(part->channels);
+		part->channels = NULL;
+		kfree(part->local_GPs_base);
+		part->local_GPs = NULL;
+		dev_err(xpc_chan, "can't get memory for remote get/put "
+			"values\n");
+		return xpcNoMemory;
+	}
+	memset(part->remote_GPs, 0, XPC_GP_SIZE);
+
+
+	/* allocate all the required open and close args */
+
+	part->local_openclose_args = xpc_kmalloc_cacheline_aligned(
+					XPC_OPENCLOSE_ARGS_SIZE, GFP_KERNEL,
+					&part->local_openclose_args_base);
+	if (part->local_openclose_args == NULL) {
+		kfree(part->channels);
+		part->channels = NULL;
+		kfree(part->local_GPs_base);
+		part->local_GPs = NULL;
+		kfree(part->remote_GPs_base);
+		part->remote_GPs = NULL;
+		dev_err(xpc_chan, "can't get memory for local connect args\n");
+		return xpcNoMemory;
+	}
+	memset(part->local_openclose_args, 0, XPC_OPENCLOSE_ARGS_SIZE);
+
+	part->remote_openclose_args = xpc_kmalloc_cacheline_aligned(
+					XPC_OPENCLOSE_ARGS_SIZE, GFP_KERNEL,
+					&part->remote_openclose_args_base);
+	if (part->remote_openclose_args == NULL) {
+		kfree(part->channels);
+		part->channels = NULL;
+		kfree(part->local_GPs_base);
+		part->local_GPs = NULL;
+		kfree(part->remote_GPs_base);
+		part->remote_GPs = NULL;
+		kfree(part->local_openclose_args_base);
+		part->local_openclose_args = NULL;
+		dev_err(xpc_chan, "can't get memory for remote connect args\n");
+		return xpcNoMemory;
+	}
+	memset(part->remote_openclose_args, 0, XPC_OPENCLOSE_ARGS_SIZE);
+
+
+	xpc_initialize_channels(part, partid);
+
+	atomic_set(&part->nchannels_active, 0);
+
+
+	/* local_IPI_amo were set to 0 by an earlier memset() */
+
+	/* Initialize this partitions AMO_t structure */
+	part->local_IPI_amo_va = xpc_IPI_init(partid);
+
+	spin_lock_init(&part->IPI_lock);
+
+	atomic_set(&part->channel_mgr_requests, 1);
+	init_waitqueue_head(&part->channel_mgr_wq);
+
+	sprintf(part->IPI_owner, "xpc%02d", partid);
+	ret = request_irq(SGI_XPC_NOTIFY, xpc_notify_IRQ_handler, SA_SHIRQ,
+				part->IPI_owner, (void *) (u64) partid);
+	if (ret != 0) {
+		kfree(part->channels);
+		part->channels = NULL;
+		kfree(part->local_GPs_base);
+		part->local_GPs = NULL;
+		kfree(part->remote_GPs_base);
+		part->remote_GPs = NULL;
+		kfree(part->local_openclose_args_base);
+		part->local_openclose_args = NULL;
+		kfree(part->remote_openclose_args_base);
+		part->remote_openclose_args = NULL;
+		dev_err(xpc_chan, "can't register NOTIFY IRQ handler, "
+			"errno=%d\n", -ret);
+		return xpcLackOfResources;
+	}
+
+	/* Setup a timer to check for dropped IPIs */
+	timer = &part->dropped_IPI_timer;
+	init_timer(timer);
+	timer->function = (void (*)(unsigned long)) xpc_dropped_IPI_check;
+	timer->data = (unsigned long) part;
+	timer->expires = jiffies + XPC_P_DROPPED_IPI_WAIT;
+	add_timer(timer);
+
+	/*
+	 * With the setting of the partition setup_state to XPC_P_SETUP, we're
+	 * declaring that this partition is ready to go.
+	 */
+	(volatile u8) part->setup_state = XPC_P_SETUP;
+
+
+	/*
+	 * Setup the per partition specific variables required by the
+	 * remote partition to establish channel connections with us.
+	 *
+	 * The setting of the magic # indicates that these per partition
+	 * specific variables are ready to be used.
+	 */
+	xpc_vars_part[partid].GPs_pa = __pa(part->local_GPs);
+	xpc_vars_part[partid].openclose_args_pa =
+					__pa(part->local_openclose_args);
+	xpc_vars_part[partid].IPI_amo_pa = __pa(part->local_IPI_amo_va);
+	xpc_vars_part[partid].IPI_nasid = cpuid_to_nasid(smp_processor_id());
+	xpc_vars_part[partid].IPI_phys_cpuid =
+					cpu_physical_id(smp_processor_id());
+	xpc_vars_part[partid].nchannels = part->nchannels;
+	(volatile u64) xpc_vars_part[partid].magic = XPC_VP_MAGIC1;
+
+	return xpcSuccess;
+}
+
+
+/*
+ * Create a wrapper that hides the underlying mechanism for pulling a cacheline
+ * (or multiple cachelines) from a remote partition.
+ *
+ * src must be a cacheline aligned physical address on the remote partition.
+ * dst must be a cacheline aligned virtual address on this partition.
+ * cnt must be an cacheline sized
+ */
+static enum xpc_retval
+xpc_pull_remote_cachelines(struct xpc_partition *part, void *dst,
+				const void *src, size_t cnt)
+{
+	bte_result_t bte_ret;
+
+
+	DBUG_ON((u64) src != L1_CACHE_ALIGN((u64) src));
+	DBUG_ON((u64) dst != L1_CACHE_ALIGN((u64) dst));
+	DBUG_ON(cnt != L1_CACHE_ALIGN(cnt));
+
+	if (part->act_state == XPC_P_DEACTIVATING) {
+		return part->reason;
+	}
+
+	bte_ret = xp_bte_copy((u64) src, (u64) ia64_tpa((u64) dst),
+				(u64) cnt, (BTE_NORMAL | BTE_WACQUIRE), NULL);
+	if (bte_ret == BTE_SUCCESS) {
+		return xpcSuccess;
+	}
+
+	dev_dbg(xpc_chan, "xp_bte_copy() from partition %d failed, ret=%d\n",
+		XPC_PARTID(part), bte_ret);
+
+	return xpc_map_bte_errors(bte_ret);
+}
+
+
+/*
+ * Pull the remote per partititon specific variables from the specified
+ * partition.
+ */
+enum xpc_retval
+xpc_pull_remote_vars_part(struct xpc_partition *part)
+{
+	u8 buffer[L1_CACHE_BYTES * 2];
+	struct xpc_vars_part *pulled_entry_cacheline =
+			(struct xpc_vars_part *) L1_CACHE_ALIGN((u64) buffer);
+	struct xpc_vars_part *pulled_entry;
+	u64 remote_entry_cacheline_pa, remote_entry_pa;
+	partid_t partid = XPC_PARTID(part);
+	enum xpc_retval ret;
+
+
+	/* pull the cacheline that contains the variables we're interested in */
+
+	DBUG_ON(part->remote_vars_part_pa !=
+				L1_CACHE_ALIGN(part->remote_vars_part_pa));
+	DBUG_ON(sizeof(struct xpc_vars_part) != L1_CACHE_BYTES / 2);
+
+	remote_entry_pa = part->remote_vars_part_pa +
+			sn_partition_id * sizeof(struct xpc_vars_part);
+
+	remote_entry_cacheline_pa = (remote_entry_pa & ~(L1_CACHE_BYTES - 1));
+
+	pulled_entry = (struct xpc_vars_part *) ((u64) pulled_entry_cacheline +
+				(remote_entry_pa & (L1_CACHE_BYTES - 1)));
+
+	ret = xpc_pull_remote_cachelines(part, pulled_entry_cacheline,
+					(void *) remote_entry_cacheline_pa,
+					L1_CACHE_BYTES);
+	if (ret != xpcSuccess) {
+		dev_dbg(xpc_chan, "failed to pull XPC vars_part from "
+			"partition %d, ret=%d\n", partid, ret);
+		return ret;
+	}
+
+
+	/* see if they've been set up yet */
+
+	if (pulled_entry->magic != XPC_VP_MAGIC1 &&
+				pulled_entry->magic != XPC_VP_MAGIC2) {
+
+		if (pulled_entry->magic != 0) {
+			dev_dbg(xpc_chan, "partition %d's XPC vars_part for "
+				"partition %d has bad magic value (=0x%lx)\n",
+				partid, sn_partition_id, pulled_entry->magic);
+			return xpcBadMagic;
+		}
+
+		/* they've not been initialized yet */
+		return xpcRetry;
+	}
+
+	if (xpc_vars_part[partid].magic == XPC_VP_MAGIC1) {
+
+		/* validate the variables */
+
+		if (pulled_entry->GPs_pa == 0 ||
+				pulled_entry->openclose_args_pa == 0 ||
+					pulled_entry->IPI_amo_pa == 0) {
+
+			dev_err(xpc_chan, "partition %d's XPC vars_part for "
+				"partition %d are not valid\n", partid,
+				sn_partition_id);
+			return xpcInvalidAddress;
+		}
+
+		/* the variables we imported look to be valid */
+
+		part->remote_GPs_pa = pulled_entry->GPs_pa;
+		part->remote_openclose_args_pa =
+					pulled_entry->openclose_args_pa;
+		part->remote_IPI_amo_va =
+				      (AMO_t *) __va(pulled_entry->IPI_amo_pa);
+		part->remote_IPI_nasid = pulled_entry->IPI_nasid;
+		part->remote_IPI_phys_cpuid = pulled_entry->IPI_phys_cpuid;
+
+		if (part->nchannels > pulled_entry->nchannels) {
+			part->nchannels = pulled_entry->nchannels;
+		}
+
+		/* let the other side know that we've pulled their variables */
+
+		(volatile u64) xpc_vars_part[partid].magic = XPC_VP_MAGIC2;
+	}
+
+	if (pulled_entry->magic == XPC_VP_MAGIC1) {
+		return xpcRetry;
+	}
+
+	return xpcSuccess;
+}
+
+
+/*
+ * Get the IPI flags and pull the openclose args and/or remote GPs as needed.
+ */
+static u64
+xpc_get_IPI_flags(struct xpc_partition *part)
+{
+	unsigned long irq_flags;
+	u64 IPI_amo;
+	enum xpc_retval ret;
+
+
+	/*
+	 * See if there are any IPI flags to be handled.
+	 */
+
+	spin_lock_irqsave(&part->IPI_lock, irq_flags);
+	if ((IPI_amo = part->local_IPI_amo) != 0) {
+		part->local_IPI_amo = 0;
+	}
+	spin_unlock_irqrestore(&part->IPI_lock, irq_flags);
+
+
+	if (XPC_ANY_OPENCLOSE_IPI_FLAGS_SET(IPI_amo)) {
+		ret = xpc_pull_remote_cachelines(part,
+					part->remote_openclose_args,
+					(void *) part->remote_openclose_args_pa,
+					XPC_OPENCLOSE_ARGS_SIZE);
+		if (ret != xpcSuccess) {
+			XPC_DEACTIVATE_PARTITION(part, ret);
+
+			dev_dbg(xpc_chan, "failed to pull openclose args from "
+				"partition %d, ret=%d\n", XPC_PARTID(part),
+				ret);
+
+			/* don't bother processing IPIs anymore */
+			IPI_amo = 0;
+		}
+	}
+
+	if (XPC_ANY_MSG_IPI_FLAGS_SET(IPI_amo)) {
+		ret = xpc_pull_remote_cachelines(part, part->remote_GPs,
+						(void *) part->remote_GPs_pa,
+						XPC_GP_SIZE);
+		if (ret != xpcSuccess) {
+			XPC_DEACTIVATE_PARTITION(part, ret);
+
+			dev_dbg(xpc_chan, "failed to pull GPs from partition "
+				"%d, ret=%d\n", XPC_PARTID(part), ret);
+
+			/* don't bother processing IPIs anymore */
+			IPI_amo = 0;
+		}
+	}
+
+	return IPI_amo;
+}
+
+
+/*
+ * Allocate the local message queue and the notify queue.
+ */
+static enum xpc_retval
+xpc_allocate_local_msgqueue(struct xpc_channel *ch)
+{
+	unsigned long irq_flags;
+	int nentries;
+	size_t nbytes;
+
+
+	// >>> may want to check for ch->flags & XPC_C_DISCONNECTING between
+	// >>> iterations of the for-loop, bail if set?
+
+	// >>> should we impose a minumum #of entries? like 4 or 8?
+	for (nentries = ch->local_nentries; nentries > 0; nentries--) {
+
+		nbytes = nentries * ch->msg_size;
+		ch->local_msgqueue = xpc_kmalloc_cacheline_aligned(nbytes,
+						(GFP_KERNEL | GFP_DMA),
+						&ch->local_msgqueue_base);
+		if (ch->local_msgqueue == NULL) {
+			continue;
+		}
+		memset(ch->local_msgqueue, 0, nbytes);
+
+		nbytes = nentries * sizeof(struct xpc_notify);
+		ch->notify_queue = kmalloc(nbytes, (GFP_KERNEL | GFP_DMA));
+		if (ch->notify_queue == NULL) {
+			kfree(ch->local_msgqueue_base);
+			ch->local_msgqueue = NULL;
+			continue;
+		}
+		memset(ch->notify_queue, 0, nbytes);
+
+		spin_lock_irqsave(&ch->lock, irq_flags);
+		if (nentries < ch->local_nentries) {
+			dev_dbg(xpc_chan, "nentries=%d local_nentries=%d, "
+				"partid=%d, channel=%d\n", nentries,
+				ch->local_nentries, ch->partid, ch->number);
+
+			ch->local_nentries = nentries;
+		}
+		spin_unlock_irqrestore(&ch->lock, irq_flags);
+		return xpcSuccess;
+	}
+
+	dev_dbg(xpc_chan, "can't get memory for local message queue and notify "
+		"queue, partid=%d, channel=%d\n", ch->partid, ch->number);
+	return xpcNoMemory;
+}
+
+
+/*
+ * Allocate the cached remote message queue.
+ */
+static enum xpc_retval
+xpc_allocate_remote_msgqueue(struct xpc_channel *ch)
+{
+	unsigned long irq_flags;
+	int nentries;
+	size_t nbytes;
+
+
+	DBUG_ON(ch->remote_nentries <= 0);
+
+	// >>> may want to check for ch->flags & XPC_C_DISCONNECTING between
+	// >>> iterations of the for-loop, bail if set?
+
+	// >>> should we impose a minumum #of entries? like 4 or 8?
+	for (nentries = ch->remote_nentries; nentries > 0; nentries--) {
+
+		nbytes = nentries * ch->msg_size;
+		ch->remote_msgqueue = xpc_kmalloc_cacheline_aligned(nbytes,
+						(GFP_KERNEL | GFP_DMA),
+						&ch->remote_msgqueue_base);
+		if (ch->remote_msgqueue == NULL) {
+			continue;
+		}
+		memset(ch->remote_msgqueue, 0, nbytes);
+
+		spin_lock_irqsave(&ch->lock, irq_flags);
+		if (nentries < ch->remote_nentries) {
+			dev_dbg(xpc_chan, "nentries=%d remote_nentries=%d, "
+				"partid=%d, channel=%d\n", nentries,
+				ch->remote_nentries, ch->partid, ch->number);
+
+			ch->remote_nentries = nentries;
+		}
+		spin_unlock_irqrestore(&ch->lock, irq_flags);
+		return xpcSuccess;
+	}
+
+	dev_dbg(xpc_chan, "can't get memory for cached remote message queue, "
+		"partid=%d, channel=%d\n", ch->partid, ch->number);
+	return xpcNoMemory;
+}
+
+
+/*
+ * Allocate message queues and other stuff associated with a channel.
+ *
+ * Note: Assumes all of the channel sizes are filled in.
+ */
+static enum xpc_retval
+xpc_allocate_msgqueues(struct xpc_channel *ch)
+{
+	unsigned long irq_flags;
+	int i;
+	enum xpc_retval ret;
+
+
+	DBUG_ON(ch->flags & XPC_C_SETUP);
+
+	if ((ret = xpc_allocate_local_msgqueue(ch)) != xpcSuccess) {
+		return ret;
+	}
+
+	if ((ret = xpc_allocate_remote_msgqueue(ch)) != xpcSuccess) {
+		kfree(ch->local_msgqueue_base);
+		ch->local_msgqueue = NULL;
+		kfree(ch->notify_queue);
+		ch->notify_queue = NULL;
+		return ret;
+	}
+
+	for (i = 0; i < ch->local_nentries; i++) {
+		/* use a semaphore as an event wait queue */
+		sema_init(&ch->notify_queue[i].sema, 0);
+	}
+
+	sema_init(&ch->teardown_sema, 0);	/* event wait */
+
+	spin_lock_irqsave(&ch->lock, irq_flags);
+	ch->flags |= XPC_C_SETUP;
+	spin_unlock_irqrestore(&ch->lock, irq_flags);
+
+	return xpcSuccess;
+}
+
+
+/*
+ * Process a connect message from a remote partition.
+ *
+ * Note: xpc_process_connect() is expecting to be called with the
+ * spin_lock_irqsave held and will leave it locked upon return.
+ */
+static void
+xpc_process_connect(struct xpc_channel *ch, unsigned long *irq_flags)
+{
+	enum xpc_retval ret;
+
+
+	DBUG_ON(!spin_is_locked(&ch->lock));
+
+	if (!(ch->flags & XPC_C_OPENREQUEST) ||
+				!(ch->flags & XPC_C_ROPENREQUEST)) {
+		/* nothing more to do for now */
+		return;
+	}
+	DBUG_ON(!(ch->flags & XPC_C_CONNECTING));
+
+	if (!(ch->flags & XPC_C_SETUP)) {
+		spin_unlock_irqrestore(&ch->lock, *irq_flags);
+		ret = xpc_allocate_msgqueues(ch);
+		spin_lock_irqsave(&ch->lock, *irq_flags);
+
+		if (ret != xpcSuccess) {
+			XPC_DISCONNECT_CHANNEL(ch, ret, irq_flags);
+		}
+		if (ch->flags & (XPC_C_CONNECTED | XPC_C_DISCONNECTING)) {
+			return;
+		}
+
+		DBUG_ON(!(ch->flags & XPC_C_SETUP));
+		DBUG_ON(ch->local_msgqueue == NULL);
+		DBUG_ON(ch->remote_msgqueue == NULL);
+	}
+
+	if (!(ch->flags & XPC_C_OPENREPLY)) {
+		ch->flags |= XPC_C_OPENREPLY;
+		xpc_IPI_send_openreply(ch, irq_flags);
+	}
+
+	if (!(ch->flags & XPC_C_ROPENREPLY)) {
+		return;
+	}
+
+	DBUG_ON(ch->remote_msgqueue_pa == 0);
+
+	ch->flags = (XPC_C_CONNECTED | XPC_C_SETUP);	/* clear all else */
+
+	dev_info(xpc_chan, "channel %d to partition %d connected\n",
+		ch->number, ch->partid);
+
+	spin_unlock_irqrestore(&ch->lock, *irq_flags);
+	xpc_create_kthreads(ch, 1);
+	spin_lock_irqsave(&ch->lock, *irq_flags);
+}
+
+
+/*
+ * Free up message queues and other stuff that were allocated for the specified
+ * channel.
+ *
+ * Note: ch->reason and ch->reason_line are left set for debugging purposes,
+ * they're cleared when XPC_C_DISCONNECTED is cleared.
+ */
+static void
+xpc_free_msgqueues(struct xpc_channel *ch)
+{
+	DBUG_ON(!spin_is_locked(&ch->lock));
+	DBUG_ON(atomic_read(&ch->n_to_notify) != 0);
+
+	ch->remote_msgqueue_pa = 0;
+	ch->func = NULL;
+	ch->key = NULL;
+	ch->msg_size = 0;
+	ch->local_nentries = 0;
+	ch->remote_nentries = 0;
+	ch->kthreads_assigned_limit = 0;
+	ch->kthreads_idle_limit = 0;
+
+	ch->local_GP->get = 0;
+	ch->local_GP->put = 0;
+	ch->remote_GP.get = 0;
+	ch->remote_GP.put = 0;
+	ch->w_local_GP.get = 0;
+	ch->w_local_GP.put = 0;
+	ch->w_remote_GP.get = 0;
+	ch->w_remote_GP.put = 0;
+	ch->next_msg_to_pull = 0;
+
+	if (ch->flags & XPC_C_SETUP) {
+		ch->flags &= ~XPC_C_SETUP;
+
+		dev_dbg(xpc_chan, "ch->flags=0x%x, partid=%d, channel=%d\n",
+			ch->flags, ch->partid, ch->number);
+
+		kfree(ch->local_msgqueue_base);
+		ch->local_msgqueue = NULL;
+		kfree(ch->remote_msgqueue_base);
+		ch->remote_msgqueue = NULL;
+		kfree(ch->notify_queue);
+		ch->notify_queue = NULL;
+
+		/* in case someone is waiting for the teardown to complete */
+		up(&ch->teardown_sema);
+	}
+}
+
+
+/*
+ * spin_lock_irqsave() is expected to be held on entry.
+ */
+static void
+xpc_process_disconnect(struct xpc_channel *ch, unsigned long *irq_flags)
+{
+	struct xpc_partition *part = &xpc_partitions[ch->partid];
+	u32 ch_flags = ch->flags;
+
+
+	DBUG_ON(!spin_is_locked(&ch->lock));
+
+	if (!(ch->flags & XPC_C_DISCONNECTING)) {
+		return;
+	}
+
+	DBUG_ON(!(ch->flags & XPC_C_CLOSEREQUEST));
+
+	/* make sure all activity has settled down first */
+
+	if (atomic_read(&ch->references) > 0) {
+		return;
+	}
+	DBUG_ON(atomic_read(&ch->kthreads_assigned) != 0);
+
+	/* it's now safe to free the channel's message queues */
+
+	xpc_free_msgqueues(ch);
+	DBUG_ON(ch->flags & XPC_C_SETUP);
+
+	if (part->act_state != XPC_P_DEACTIVATING) {
+
+		/* as long as the other side is up do the full protocol */
+
+		if (!(ch->flags & XPC_C_RCLOSEREQUEST)) {
+			return;
+		}
+
+		if (!(ch->flags & XPC_C_CLOSEREPLY)) {
+			ch->flags |= XPC_C_CLOSEREPLY;
+			xpc_IPI_send_closereply(ch, irq_flags);
+		}
+
+		if (!(ch->flags & XPC_C_RCLOSEREPLY)) {
+			return;
+		}
+	}
+
+	/* both sides are disconnected now */
+
+	ch->flags = XPC_C_DISCONNECTED;	/* clear all flags, but this one */
+
+	atomic_dec(&part->nchannels_active);
+
+	if (ch_flags & XPC_C_WASCONNECTED) {
+		dev_info(xpc_chan, "channel %d to partition %d disconnected, "
+			"reason=%d\n", ch->number, ch->partid, ch->reason);
+	}
+}
+
+
+/*
+ * Process a change in the channel's remote connection state.
+ */
+static void
+xpc_process_openclose_IPI(struct xpc_partition *part, int ch_number,
+				u8 IPI_flags)
+{
+	unsigned long irq_flags;
+	struct xpc_openclose_args *args =
+				&part->remote_openclose_args[ch_number];
+	struct xpc_channel *ch = &part->channels[ch_number];
+	enum xpc_retval reason;
+
+
+
+	spin_lock_irqsave(&ch->lock, irq_flags);
+
+
+	if (IPI_flags & XPC_IPI_CLOSEREQUEST) {
+
+		dev_dbg(xpc_chan, "XPC_IPI_CLOSEREQUEST (reason=%d) received "
+			"from partid=%d, channel=%d\n", args->reason,
+			ch->partid, ch->number);
+
+		/*
+		 * If RCLOSEREQUEST is set, we're probably waiting for
+		 * RCLOSEREPLY. We should find it and a ROPENREQUEST packed
+		 * with this RCLOSEQREUQEST in the IPI_flags.
+		 */
+
+		if (ch->flags & XPC_C_RCLOSEREQUEST) {
+			DBUG_ON(!(ch->flags & XPC_C_DISCONNECTING));
+			DBUG_ON(!(ch->flags & XPC_C_CLOSEREQUEST));
+			DBUG_ON(!(ch->flags & XPC_C_CLOSEREPLY));
+			DBUG_ON(ch->flags & XPC_C_RCLOSEREPLY);
+
+			DBUG_ON(!(IPI_flags & XPC_IPI_CLOSEREPLY));
+			IPI_flags &= ~XPC_IPI_CLOSEREPLY;
+			ch->flags |= XPC_C_RCLOSEREPLY;
+
+			/* both sides have finished disconnecting */
+			xpc_process_disconnect(ch, &irq_flags);
+		}
+
+		if (ch->flags & XPC_C_DISCONNECTED) {
+			// >>> explain this section
+
+			if (!(IPI_flags & XPC_IPI_OPENREQUEST)) {
+				DBUG_ON(part->act_state !=
+							XPC_P_DEACTIVATING);
+				spin_unlock_irqrestore(&ch->lock, irq_flags);
+				return;
+			}
+
+			XPC_SET_REASON(ch, 0, 0);
+			ch->flags &= ~XPC_C_DISCONNECTED;
+
+			atomic_inc(&part->nchannels_active);
+			ch->flags |= (XPC_C_CONNECTING | XPC_C_ROPENREQUEST);
+		}
+
+		IPI_flags &= ~(XPC_IPI_OPENREQUEST | XPC_IPI_OPENREPLY);
+
+		/*
+		 * The meaningful CLOSEREQUEST connection state fields are:
+		 *      reason = reason connection is to be closed
+		 */
+
+		ch->flags |= XPC_C_RCLOSEREQUEST;
+
+		if (!(ch->flags & XPC_C_DISCONNECTING)) {
+			reason = args->reason;
+			if (reason <= xpcSuccess || reason > xpcUnknownReason) {
+				reason = xpcUnknownReason;
+			} else if (reason == xpcUnregistering) {
+				reason = xpcOtherUnregistering;
+			}
+
+			XPC_DISCONNECT_CHANNEL(ch, reason, &irq_flags);
+		} else {
+			xpc_process_disconnect(ch, &irq_flags);
+		}
+	}
+
+
+	if (IPI_flags & XPC_IPI_CLOSEREPLY) {
+
+		dev_dbg(xpc_chan, "XPC_IPI_CLOSEREPLY received from partid=%d,"
+			" channel=%d\n", ch->partid, ch->number);
+
+		if (ch->flags & XPC_C_DISCONNECTED) {
+			DBUG_ON(part->act_state != XPC_P_DEACTIVATING);
+			spin_unlock_irqrestore(&ch->lock, irq_flags);
+			return;
+		}
+
+		DBUG_ON(!(ch->flags & XPC_C_CLOSEREQUEST));
+		DBUG_ON(!(ch->flags & XPC_C_RCLOSEREQUEST));
+
+		ch->flags |= XPC_C_RCLOSEREPLY;
+
+		if (ch->flags & XPC_C_CLOSEREPLY) {
+			/* both sides have finished disconnecting */
+			xpc_process_disconnect(ch, &irq_flags);
+		}
+	}
+
+
+	if (IPI_flags & XPC_IPI_OPENREQUEST) {
+
+		dev_dbg(xpc_chan, "XPC_IPI_OPENREQUEST (msg_size=%d, "
+			"local_nentries=%d) received from partid=%d, "
+			"channel=%d\n", args->msg_size, args->local_nentries,
+			ch->partid, ch->number);
+
+		if ((ch->flags & XPC_C_DISCONNECTING) ||
+					part->act_state == XPC_P_DEACTIVATING) {
+			spin_unlock_irqrestore(&ch->lock, irq_flags);
+			return;
+		}
+		DBUG_ON(!(ch->flags & (XPC_C_DISCONNECTED |
+							XPC_C_OPENREQUEST)));
+		DBUG_ON(ch->flags & (XPC_C_ROPENREQUEST | XPC_C_ROPENREPLY |
+					XPC_C_OPENREPLY | XPC_C_CONNECTED));
+
+		/*
+		 * The meaningful OPENREQUEST connection state fields are:
+		 *      msg_size = size of channel's messages in bytes
+		 *      local_nentries = remote partition's local_nentries
+		 */
+		DBUG_ON(args->msg_size == 0);
+		DBUG_ON(args->local_nentries == 0);
+
+		ch->flags |= (XPC_C_ROPENREQUEST | XPC_C_CONNECTING);
+		ch->remote_nentries = args->local_nentries;
+
+
+		if (ch->flags & XPC_C_OPENREQUEST) {
+			if (args->msg_size != ch->msg_size) {
+				XPC_DISCONNECT_CHANNEL(ch, xpcUnequalMsgSizes,
+								&irq_flags);
+				spin_unlock_irqrestore(&ch->lock, irq_flags);
+				return;
+			}
+		} else {
+			ch->msg_size = args->msg_size;
+
+			XPC_SET_REASON(ch, 0, 0);
+			ch->flags &= ~XPC_C_DISCONNECTED;
+
+			atomic_inc(&part->nchannels_active);
+		}
+
+		xpc_process_connect(ch, &irq_flags);
+	}
+
+
+	if (IPI_flags & XPC_IPI_OPENREPLY) {
+
+		dev_dbg(xpc_chan, "XPC_IPI_OPENREPLY (local_msgqueue_pa=0x%lx, "
+			"local_nentries=%d, remote_nentries=%d) received from "
+			"partid=%d, channel=%d\n", args->local_msgqueue_pa,
+			args->local_nentries, args->remote_nentries,
+			ch->partid, ch->number);
+
+		if (ch->flags & (XPC_C_DISCONNECTING | XPC_C_DISCONNECTED)) {
+			spin_unlock_irqrestore(&ch->lock, irq_flags);
+			return;
+		}
+		DBUG_ON(!(ch->flags & XPC_C_OPENREQUEST));
+		DBUG_ON(!(ch->flags & XPC_C_ROPENREQUEST));
+		DBUG_ON(ch->flags & XPC_C_CONNECTED);
+
+		/*
+		 * The meaningful OPENREPLY connection state fields are:
+		 *      local_msgqueue_pa = physical address of remote
+		 *			    partition's local_msgqueue
+		 *      local_nentries = remote partition's local_nentries
+		 *      remote_nentries = remote partition's remote_nentries
+		 */
+		DBUG_ON(args->local_msgqueue_pa == 0);
+		DBUG_ON(args->local_nentries == 0);
+		DBUG_ON(args->remote_nentries == 0);
+
+		ch->flags |= XPC_C_ROPENREPLY;
+		ch->remote_msgqueue_pa = args->local_msgqueue_pa;
+
+		if (args->local_nentries < ch->remote_nentries) {
+			dev_dbg(xpc_chan, "XPC_IPI_OPENREPLY: new "
+				"remote_nentries=%d, old remote_nentries=%d, "
+				"partid=%d, channel=%d\n",
+				args->local_nentries, ch->remote_nentries,
+				ch->partid, ch->number);
+
+			ch->remote_nentries = args->local_nentries;
+		}
+		if (args->remote_nentries < ch->local_nentries) {
+			dev_dbg(xpc_chan, "XPC_IPI_OPENREPLY: new "
+				"local_nentries=%d, old local_nentries=%d, "
+				"partid=%d, channel=%d\n",
+				args->remote_nentries, ch->local_nentries,
+				ch->partid, ch->number);
+
+			ch->local_nentries = args->remote_nentries;
+		}
+
+		xpc_process_connect(ch, &irq_flags);
+	}
+
+	spin_unlock_irqrestore(&ch->lock, irq_flags);
+}
+
+
+/*
+ * Attempt to establish a channel connection to a remote partition.
+ */
+static enum xpc_retval
+xpc_connect_channel(struct xpc_channel *ch)
+{
+	unsigned long irq_flags;
+	struct xpc_registration *registration = &xpc_registrations[ch->number];
+
+
+	if (down_interruptible(&registration->sema) != 0) {
+		return xpcInterrupted;
+	}
+
+	if (!XPC_CHANNEL_REGISTERED(ch->number)) {
+		up(&registration->sema);
+		return xpcUnregistered;
+	}
+
+	spin_lock_irqsave(&ch->lock, irq_flags);
+
+	DBUG_ON(ch->flags & XPC_C_CONNECTED);
+	DBUG_ON(ch->flags & XPC_C_OPENREQUEST);
+
+	if (ch->flags & XPC_C_DISCONNECTING) {
+		spin_unlock_irqrestore(&ch->lock, irq_flags);
+		up(&registration->sema);
+		return ch->reason;
+	}
+
+
+	/* add info from the channel connect registration to the channel */
+
+	ch->kthreads_assigned_limit = registration->assigned_limit;
+	ch->kthreads_idle_limit = registration->idle_limit;
+	DBUG_ON(atomic_read(&ch->kthreads_assigned) != 0);
+	DBUG_ON(atomic_read(&ch->kthreads_idle) != 0);
+	DBUG_ON(atomic_read(&ch->kthreads_active) != 0);
+
+	ch->func = registration->func;
+	DBUG_ON(registration->func == NULL);
+	ch->key = registration->key;
+
+	ch->local_nentries = registration->nentries;
+
+	if (ch->flags & XPC_C_ROPENREQUEST) {
+		if (registration->msg_size != ch->msg_size) {
+			/* the local and remote sides aren't the same */
+
+			/*
+			 * Because XPC_DISCONNECT_CHANNEL() can block we're
+			 * forced to up the registration sema before we unlock
+			 * the channel lock. But that's okay here because we're
+			 * done with the part that required the registration
+			 * sema. XPC_DISCONNECT_CHANNEL() requires that the
+			 * channel lock be locked and will unlock and relock
+			 * the channel lock as needed.
+			 */
+			up(&registration->sema);
+			XPC_DISCONNECT_CHANNEL(ch, xpcUnequalMsgSizes,
+								&irq_flags);
+			spin_unlock_irqrestore(&ch->lock, irq_flags);
+			return xpcUnequalMsgSizes;
+		}
+	} else {
+		ch->msg_size = registration->msg_size;
+
+		XPC_SET_REASON(ch, 0, 0);
+		ch->flags &= ~XPC_C_DISCONNECTED;
+
+		atomic_inc(&xpc_partitions[ch->partid].nchannels_active);
+	}
+
+	up(&registration->sema);
+
+
+	/* initiate the connection */
+
+	ch->flags |= (XPC_C_OPENREQUEST | XPC_C_CONNECTING);
+	xpc_IPI_send_openrequest(ch, &irq_flags);
+
+	xpc_process_connect(ch, &irq_flags);
+
+	spin_unlock_irqrestore(&ch->lock, irq_flags);
+
+	return xpcSuccess;
+}
+
+
+/*
+ * Notify those who wanted to be notified upon delivery of their message.
+ */
+static void
+xpc_notify_senders(struct xpc_channel *ch, enum xpc_retval reason, s64 put)
+{
+	struct xpc_notify *notify;
+	u8 notify_type;
+	s64 get = ch->w_remote_GP.get - 1;
+
+
+	while (++get < put && atomic_read(&ch->n_to_notify) > 0) {
+
+		notify = &ch->notify_queue[get % ch->local_nentries];
+
+		/*
+		 * See if the notify entry indicates it was associated with
+		 * a message who's sender wants to be notified. It is possible
+		 * that it is, but someone else is doing or has done the
+		 * notification.
+		 */
+		notify_type = notify->type;
+		if (notify_type == 0 ||
+				cmpxchg(&notify->type, notify_type, 0) !=
+								notify_type) {
+			continue;
+		}
+
+		DBUG_ON(notify_type != XPC_N_CALL);
+
+		atomic_dec(&ch->n_to_notify);
+
+		if (notify->func != NULL) {
+			dev_dbg(xpc_chan, "notify->func() called, notify=0x%p, "
+				"msg_number=%ld, partid=%d, channel=%d\n",
+				(void *) notify, get, ch->partid, ch->number);
+
+			notify->func(reason, ch->partid, ch->number,
+								notify->key);
+
+			dev_dbg(xpc_chan, "notify->func() returned, "
+				"notify=0x%p, msg_number=%ld, partid=%d, "
+				"channel=%d\n", (void *) notify, get,
+				ch->partid, ch->number);
+		}
+	}
+}
+
+
+/*
+ * Clear some of the msg flags in the local message queue.
+ */
+static inline void
+xpc_clear_local_msgqueue_flags(struct xpc_channel *ch)
+{
+	struct xpc_msg *msg;
+	s64 get;
+
+
+	get = ch->w_remote_GP.get;
+	do {
+		msg = (struct xpc_msg *) ((u64) ch->local_msgqueue +
+				(get % ch->local_nentries) * ch->msg_size);
+		msg->flags = 0;
+	} while (++get < (volatile s64) ch->remote_GP.get);
+}
+
+
+/*
+ * Clear some of the msg flags in the remote message queue.
+ */
+static inline void
+xpc_clear_remote_msgqueue_flags(struct xpc_channel *ch)
+{
+	struct xpc_msg *msg;
+	s64 put;
+
+
+	put = ch->w_remote_GP.put;
+	do {
+		msg = (struct xpc_msg *) ((u64) ch->remote_msgqueue +
+				(put % ch->remote_nentries) * ch->msg_size);
+		msg->flags = 0;
+	} while (++put < (volatile s64) ch->remote_GP.put);
+}
+
+
+static void
+xpc_process_msg_IPI(struct xpc_partition *part, int ch_number)
+{
+	struct xpc_channel *ch = &part->channels[ch_number];
+	int nmsgs_sent;
+
+
+	ch->remote_GP = part->remote_GPs[ch_number];
+
+
+	/* See what, if anything, has changed for each connected channel */
+
+	xpc_msgqueue_ref(ch);
+
+	if (ch->w_remote_GP.get == ch->remote_GP.get &&
+				ch->w_remote_GP.put == ch->remote_GP.put) {
+		/* nothing changed since GPs were last pulled */
+		xpc_msgqueue_deref(ch);
+		return;
+	}
+
+	if (!(ch->flags & XPC_C_CONNECTED)){
+		xpc_msgqueue_deref(ch);
+		return;
+	}
+
+
+	/*
+	 * First check to see if messages recently sent by us have been
+	 * received by the other side. (The remote GET value will have
+	 * changed since we last looked at it.)
+	 */
+
+	if (ch->w_remote_GP.get != ch->remote_GP.get) {
+
+		/*
+		 * We need to notify any senders that want to be notified
+		 * that their sent messages have been received by their
+		 * intended recipients. We need to do this before updating
+		 * w_remote_GP.get so that we don't allocate the same message
+		 * queue entries prematurely (see xpc_allocate_msg()).
+		 */
+		if (atomic_read(&ch->n_to_notify) > 0) {
+			/*
+			 * Notify senders that messages sent have been
+			 * received and delivered by the other side.
+			 */
+			xpc_notify_senders(ch, xpcMsgDelivered,
+							ch->remote_GP.get);
+		}
+
+		/*
+		 * Clear msg->flags in previously sent messages, so that
+		 * they're ready for xpc_allocate_msg().
+		 */
+		xpc_clear_local_msgqueue_flags(ch);
+
+		(volatile s64) ch->w_remote_GP.get = ch->remote_GP.get;
+
+		dev_dbg(xpc_chan, "w_remote_GP.get changed to %ld, partid=%d, "
+			"channel=%d\n", ch->w_remote_GP.get, ch->partid,
+			ch->number);
+
+		/*
+		 * If anyone was waiting for message queue entries to become
+		 * available, wake them up.
+		 */
+		if (atomic_read(&ch->n_on_msg_allocate_wq) > 0) {
+			wake_up(&ch->msg_allocate_wq);
+		}
+	}
+
+
+	/*
+	 * Now check for newly sent messages by the other side. (The remote
+	 * PUT value will have changed since we last looked at it.)
+	 */
+
+	if (ch->w_remote_GP.put != ch->remote_GP.put) {
+		/*
+		 * Clear msg->flags in previously received messages, so that
+		 * they're ready for xpc_get_deliverable_msg().
+		 */
+		xpc_clear_remote_msgqueue_flags(ch);
+
+		(volatile s64) ch->w_remote_GP.put = ch->remote_GP.put;
+
+		dev_dbg(xpc_chan, "w_remote_GP.put changed to %ld, partid=%d, "
+			"channel=%d\n", ch->w_remote_GP.put, ch->partid,
+			ch->number);
+
+		nmsgs_sent = ch->w_remote_GP.put - ch->w_local_GP.get;
+		if (nmsgs_sent > 0) {
+			dev_dbg(xpc_chan, "msgs waiting to be copied and "
+				"delivered=%d, partid=%d, channel=%d\n",
+				nmsgs_sent, ch->partid, ch->number);
+
+			if (ch->flags & XPC_C_CONNECTCALLOUT) {
+				xpc_activate_kthreads(ch, nmsgs_sent);
+			}
+		}
+	}
+
+	xpc_msgqueue_deref(ch);
+}
+
+
+void
+xpc_process_channel_activity(struct xpc_partition *part)
+{
+	unsigned long irq_flags;
+	u64 IPI_amo, IPI_flags;
+	struct xpc_channel *ch;
+	int ch_number;
+
+
+	IPI_amo = xpc_get_IPI_flags(part);
+
+	/*
+	 * Initiate channel connections for registered channels.
+	 *
+	 * For each connected channel that has pending messages activate idle
+	 * kthreads and/or create new kthreads as needed.
+	 */
+
+	for (ch_number = 0; ch_number < part->nchannels; ch_number++) {
+		ch = &part->channels[ch_number];
+
+
+		/*
+		 * Process any open or close related IPI flags, and then deal
+		 * with connecting or disconnecting the channel as required.
+		 */
+
+		IPI_flags = XPC_GET_IPI_FLAGS(IPI_amo, ch_number);
+
+		if (XPC_ANY_OPENCLOSE_IPI_FLAGS_SET(IPI_flags)) {
+			xpc_process_openclose_IPI(part, ch_number, IPI_flags);
+		}
+
+
+		if (ch->flags & XPC_C_DISCONNECTING) {
+			spin_lock_irqsave(&ch->lock, irq_flags);
+			xpc_process_disconnect(ch, &irq_flags);
+			spin_unlock_irqrestore(&ch->lock, irq_flags);
+			continue;
+		}
+
+		if (part->act_state == XPC_P_DEACTIVATING) {
+			continue;
+		}
+
+		if (!(ch->flags & XPC_C_CONNECTED)) {
+			if (!(ch->flags & XPC_C_OPENREQUEST)) {
+				DBUG_ON(ch->flags & XPC_C_SETUP);
+				(void) xpc_connect_channel(ch);
+			} else {
+				spin_lock_irqsave(&ch->lock, irq_flags);
+				xpc_process_connect(ch, &irq_flags);
+				spin_unlock_irqrestore(&ch->lock, irq_flags);
+			}
+			continue;
+		}
+
+
+		/*
+		 * Process any message related IPI flags, this may involve the
+		 * activation of kthreads to deliver any pending messages sent
+		 * from the other partition.
+		 */
+
+		if (XPC_ANY_MSG_IPI_FLAGS_SET(IPI_flags)) {
+			xpc_process_msg_IPI(part, ch_number);
+		}
+	}
+}
+
+
+/*
+ * XPC's heartbeat code calls this function to inform XPC that a partition has
+ * gone down.  XPC responds by tearing down the XPartition Communication
+ * infrastructure used for the just downed partition.
+ *
+ * XPC's heartbeat code will never call this function and xpc_partition_up()
+ * at the same time. Nor will it ever make multiple calls to either function
+ * at the same time.
+ */
+void
+xpc_partition_down(struct xpc_partition *part, enum xpc_retval reason)
+{
+	unsigned long irq_flags;
+	int ch_number;
+	struct xpc_channel *ch;
+
+
+	dev_dbg(xpc_chan, "deactivating partition %d, reason=%d\n",
+		XPC_PARTID(part), reason);
+
+	if (!xpc_part_ref(part)) {
+		/* infrastructure for this partition isn't currently set up */
+		return;
+	}
+
+
+	/* disconnect all channels associated with the downed partition */
+
+	for (ch_number = 0; ch_number < part->nchannels; ch_number++) {
+		ch = &part->channels[ch_number];
+
+
+		xpc_msgqueue_ref(ch);
+		spin_lock_irqsave(&ch->lock, irq_flags);
+
+		XPC_DISCONNECT_CHANNEL(ch, reason, &irq_flags);
+
+		spin_unlock_irqrestore(&ch->lock, irq_flags);
+		xpc_msgqueue_deref(ch);
+	}
+
+	xpc_wakeup_channel_mgr(part);
+
+	xpc_part_deref(part);
+}
+
+
+/*
+ * Teardown the infrastructure necessary to support XPartition Communication
+ * between the specified remote partition and the local one.
+ */
+void
+xpc_teardown_infrastructure(struct xpc_partition *part)
+{
+	partid_t partid = XPC_PARTID(part);
+
+
+	/*
+	 * We start off by making this partition inaccessible to local
+	 * processes by marking it as no longer setup. Then we make it
+	 * inaccessible to remote processes by clearing the XPC per partition
+	 * specific variable's magic # (which indicates that these variables
+	 * are no longer valid) and by ignoring all XPC notify IPIs sent to
+	 * this partition.
+	 */
+
+	DBUG_ON(atomic_read(&part->nchannels_active) != 0);
+	DBUG_ON(part->setup_state != XPC_P_SETUP);
+	part->setup_state = XPC_P_WTEARDOWN;
+
+	xpc_vars_part[partid].magic = 0;
+
+
+	free_irq(SGI_XPC_NOTIFY, (void *) (u64) partid);
+
+
+	/*
+	 * Before proceding with the teardown we have to wait until all
+	 * existing references cease.
+	 */
+	wait_event(part->teardown_wq, (atomic_read(&part->references) == 0));
+
+
+	/* now we can begin tearing down the infrastructure */
+
+	part->setup_state = XPC_P_TORNDOWN;
+
+	/* in case we've still got outstanding timers registered... */
+	del_timer_sync(&part->dropped_IPI_timer);
+
+	kfree(part->remote_openclose_args_base);
+	part->remote_openclose_args = NULL;
+	kfree(part->local_openclose_args_base);
+	part->local_openclose_args = NULL;
+	kfree(part->remote_GPs_base);
+	part->remote_GPs = NULL;
+	kfree(part->local_GPs_base);
+	part->local_GPs = NULL;
+	kfree(part->channels);
+	part->channels = NULL;
+	part->local_IPI_amo_va = NULL;
+}
+
+
+/*
+ * Called by XP at the time of channel connection registration to cause
+ * XPC to establish connections to all currently active partitions.
+ */
+void
+xpc_initiate_connect(int ch_number)
+{
+	partid_t partid;
+	struct xpc_partition *part;
+	struct xpc_channel *ch;
+
+
+	DBUG_ON(ch_number < 0 || ch_number >= XPC_NCHANNELS);
+
+	for (partid = 1; partid < XP_MAX_PARTITIONS; partid++) {
+		part = &xpc_partitions[partid];
+
+		if (xpc_part_ref(part)) {
+			ch = &part->channels[ch_number];
+
+			if (!(ch->flags & XPC_C_DISCONNECTING)) {
+				DBUG_ON(ch->flags & XPC_C_OPENREQUEST);
+				DBUG_ON(ch->flags & XPC_C_CONNECTED);
+				DBUG_ON(ch->flags & XPC_C_SETUP);
+
+				/*
+				 * Initiate the establishment of a connection
+				 * on the newly registered channel to the
+				 * remote partition.
+				 */
+				xpc_wakeup_channel_mgr(part);
+			}
+
+			xpc_part_deref(part);
+		}
+	}
+}
+
+
+void
+xpc_connected_callout(struct xpc_channel *ch)
+{
+	unsigned long irq_flags;
+
+
+	/* let the registerer know that a connection has been established */
+
+	if (ch->func != NULL) {
+		dev_dbg(xpc_chan, "ch->func() called, reason=xpcConnected, "
+			"partid=%d, channel=%d\n", ch->partid, ch->number);
+
+		ch->func(xpcConnected, ch->partid, ch->number,
+				(void *) (u64) ch->local_nentries, ch->key);
+
+		dev_dbg(xpc_chan, "ch->func() returned, reason=xpcConnected, "
+			"partid=%d, channel=%d\n", ch->partid, ch->number);
+	}
+
+	spin_lock_irqsave(&ch->lock, irq_flags);
+	ch->flags |= XPC_C_CONNECTCALLOUT;
+	spin_unlock_irqrestore(&ch->lock, irq_flags);
+}
+
+
+/*
+ * Called by XP at the time of channel connection unregistration to cause
+ * XPC to teardown all current connections for the specified channel.
+ *
+ * Before returning xpc_initiate_disconnect() will wait until all connections
+ * on the specified channel have been closed/torndown. So the caller can be
+ * assured that they will not be receiving any more callouts from XPC to the
+ * function they registered via xpc_connect().
+ *
+ * Arguments:
+ *
+ *	ch_number - channel # to unregister.
+ */
+void
+xpc_initiate_disconnect(int ch_number)
+{
+	unsigned long irq_flags;
+	partid_t partid;
+	struct xpc_partition *part;
+	struct xpc_channel *ch;
+
+
+	DBUG_ON(ch_number < 0 || ch_number >= XPC_NCHANNELS);
+
+	/* initiate the channel disconnect for every active partition */
+	for (partid = 1; partid < XP_MAX_PARTITIONS; partid++) {
+		part = &xpc_partitions[partid];
+
+		if (xpc_part_ref(part)) {
+			ch = &part->channels[ch_number];
+			xpc_msgqueue_ref(ch);
+
+			spin_lock_irqsave(&ch->lock, irq_flags);
+
+			XPC_DISCONNECT_CHANNEL(ch, xpcUnregistering,
+								&irq_flags);
+
+			spin_unlock_irqrestore(&ch->lock, irq_flags);
+
+			xpc_msgqueue_deref(ch);
+			xpc_part_deref(part);
+		}
+	}
+
+	xpc_disconnect_wait(ch_number);
+}
+
+
+/*
+ * To disconnect a channel, and reflect it back to all who may be waiting.
+ *
+ * >>> An OPEN is not allowed until XPC_C_DISCONNECTING is cleared by
+ * >>> xpc_free_msgqueues().
+ *
+ * THE CHANNEL IS TO BE LOCKED BY THE CALLER AND WILL REMAIN LOCKED UPON RETURN.
+ */
+void
+xpc_disconnect_channel(const int line, struct xpc_channel *ch,
+			enum xpc_retval reason, unsigned long *irq_flags)
+{
+	u32 flags;
+
+
+	DBUG_ON(!spin_is_locked(&ch->lock));
+
+	if (ch->flags & (XPC_C_DISCONNECTING | XPC_C_DISCONNECTED)) {
+		return;
+	}
+	DBUG_ON(!(ch->flags & (XPC_C_CONNECTING | XPC_C_CONNECTED)));
+
+	dev_dbg(xpc_chan, "reason=%d, line=%d, partid=%d, channel=%d\n",
+		reason, line, ch->partid, ch->number);
+
+	XPC_SET_REASON(ch, reason, line);
+
+	flags = ch->flags;
+	/* some of these may not have been set */
+	ch->flags &= ~(XPC_C_OPENREQUEST | XPC_C_OPENREPLY |
+			XPC_C_ROPENREQUEST | XPC_C_ROPENREPLY |
+			XPC_C_CONNECTING | XPC_C_CONNECTED);
+
+	ch->flags |= (XPC_C_CLOSEREQUEST | XPC_C_DISCONNECTING);
+	xpc_IPI_send_closerequest(ch, irq_flags);
+
+	if (flags & XPC_C_CONNECTED) {
+		ch->flags |= XPC_C_WASCONNECTED;
+	}
+
+	if (atomic_read(&ch->kthreads_idle) > 0) {
+		/* wake all idle kthreads so they can exit */
+		wake_up_all(&ch->idle_wq);
+	}
+
+	spin_unlock_irqrestore(&ch->lock, *irq_flags);
+
+
+	/* wake those waiting to allocate an entry from the local msg queue */
+
+	if (atomic_read(&ch->n_on_msg_allocate_wq) > 0) {
+		wake_up(&ch->msg_allocate_wq);
+	}
+
+	/* wake those waiting for notify completion */
+
+	if (atomic_read(&ch->n_to_notify) > 0) {
+		xpc_notify_senders(ch, reason, ch->w_local_GP.put);
+	}
+
+	spin_lock_irqsave(&ch->lock, *irq_flags);
+}
+
+
+void
+xpc_disconnected_callout(struct xpc_channel *ch)
+{
+	/*
+	 * Let the channel's registerer know that the channel is now
+	 * disconnected. We don't want to do this if the registerer was never
+	 * informed of a connection being made, unless the disconnect was for
+	 * abnormal reasons.
+	 */
+
+	if (ch->func != NULL) {
+		dev_dbg(xpc_chan, "ch->func() called, reason=%d, partid=%d, "
+			"channel=%d\n", ch->reason, ch->partid, ch->number);
+
+		ch->func(ch->reason, ch->partid, ch->number, NULL, ch->key);
+
+		dev_dbg(xpc_chan, "ch->func() returned, reason=%d, partid=%d, "
+			"channel=%d\n", ch->reason, ch->partid, ch->number);
+	}
+}
+
+
+/*
+ * Wait for a message entry to become available for the specified channel,
+ * but don't wait any longer than 1 jiffy.
+ */
+static enum xpc_retval
+xpc_allocate_msg_wait(struct xpc_channel *ch)
+{
+	enum xpc_retval ret;
+
+
+	if (ch->flags & XPC_C_DISCONNECTING) {
+		DBUG_ON(ch->reason == xpcInterrupted);  // >>> Is this true?
+		return ch->reason;
+	}
+
+	atomic_inc(&ch->n_on_msg_allocate_wq);
+	ret = interruptible_sleep_on_timeout(&ch->msg_allocate_wq, 1);
+	atomic_dec(&ch->n_on_msg_allocate_wq);
+
+	if (ch->flags & XPC_C_DISCONNECTING) {
+		ret = ch->reason;
+		DBUG_ON(ch->reason == xpcInterrupted);  // >>> Is this true?
+	} else if (ret == 0) {
+		ret = xpcTimeout;
+	} else {
+		ret = xpcInterrupted;
+	}
+
+	return ret;
+}
+
+
+/*
+ * Allocate an entry for a message from the message queue associated with the
+ * specified channel.
+ */
+static enum xpc_retval
+xpc_allocate_msg(struct xpc_channel *ch, u32 flags,
+			struct xpc_msg **address_of_msg)
+{
+	struct xpc_msg *msg;
+	enum xpc_retval ret;
+	s64 put;
+
+
+	/* this reference will be dropped in xpc_send_msg() */
+	xpc_msgqueue_ref(ch);
+
+	if (ch->flags & XPC_C_DISCONNECTING) {
+		xpc_msgqueue_deref(ch);
+		return ch->reason;
+	}
+	if (!(ch->flags & XPC_C_CONNECTED)) {
+		xpc_msgqueue_deref(ch);
+		return xpcNotConnected;
+	}
+
+
+	/*
+	 * Get the next available message entry from the local message queue.
+	 * If none are available, we'll make sure that we grab the latest
+	 * GP values.
+	 */
+	ret = xpcTimeout;
+
+	while (1) {
+
+		put = (volatile s64) ch->w_local_GP.put;
+		if (put - (volatile s64) ch->w_remote_GP.get <
+							ch->local_nentries) {
+
+			/* There are available message entries. We need to try
+			 * to secure one for ourselves. We'll do this by trying
+			 * to increment w_local_GP.put as long as someone else
+			 * doesn't beat us to it. If they do, we'll have to
+			 * try again.
+		 	 */
+			if (cmpxchg(&ch->w_local_GP.put, put, put + 1) ==
+									put) {
+				/* we got the entry referenced by put */
+				break;
+			}
+			continue;	/* try again */
+		}
+
+
+		/*
+		 * There aren't any available msg entries at this time.
+		 *
+		 * In waiting for a message entry to become available,
+		 * we set a timeout in case the other side is not
+		 * sending completion IPIs. This lets us fake an IPI
+		 * that will cause the IPI handler to fetch the latest
+		 * GP values as if an IPI was sent by the other side.
+		 */
+		if (ret == xpcTimeout) {
+			xpc_IPI_send_local_msgrequest(ch);
+		}
+
+		if (flags & XPC_NOWAIT) {
+			xpc_msgqueue_deref(ch);
+			return xpcNoWait;
+		}
+
+		ret = xpc_allocate_msg_wait(ch);
+		if (ret != xpcInterrupted && ret != xpcTimeout) {
+			xpc_msgqueue_deref(ch);
+			return ret;
+		}
+	}
+
+
+	/* get the message's address and initialize it */
+	msg = (struct xpc_msg *) ((u64) ch->local_msgqueue +
+				(put % ch->local_nentries) * ch->msg_size);
+
+
+	DBUG_ON(msg->flags != 0);
+	msg->number = put;
+
+	dev_dbg(xpc_chan, "w_local_GP.put changed to %ld; msg=0x%p, "
+		"msg_number=%ld, partid=%d, channel=%d\n", put + 1,
+		(void *) msg, msg->number, ch->partid, ch->number);
+
+	*address_of_msg = msg;
+
+	return xpcSuccess;
+}
+
+
+/*
+ * Allocate an entry for a message from the message queue associated with the
+ * specified channel. NOTE that this routine can sleep waiting for a message
+ * entry to become available. To not sleep, pass in the XPC_NOWAIT flag.
+ *
+ * Arguments:
+ *
+ *	partid - ID of partition to which the channel is connected.
+ *	ch_number - channel #.
+ *	flags - see xpc.h for valid flags.
+ *	payload - address of the allocated payload area pointer (filled in on
+ * 	          return) in which the user-defined message is constructed.
+ */
+enum xpc_retval
+xpc_initiate_allocate(partid_t partid, int ch_number, u32 flags, void **payload)
+{
+	struct xpc_partition *part = &xpc_partitions[partid];
+	enum xpc_retval ret = xpcUnknownReason;
+	struct xpc_msg *msg;
+
+
+	DBUG_ON(partid <= 0 || partid >= XP_MAX_PARTITIONS);
+	DBUG_ON(ch_number < 0 || ch_number >= part->nchannels);
+
+	*payload = NULL;
+
+	if (xpc_part_ref(part)) {
+		ret = xpc_allocate_msg(&part->channels[ch_number], flags, &msg);
+		xpc_part_deref(part);
+
+		if (msg != NULL) {
+			*payload = &msg->payload;
+		}
+	}
+
+	return ret;
+}
+
+
+/*
+ * Now we actually send the messages that are ready to be sent by advancing
+ * the local message queue's Put value and then send an IPI to the recipient
+ * partition.
+ */
+static void
+xpc_send_msgs(struct xpc_channel *ch, s64 initial_put)
+{
+	struct xpc_msg *msg;
+	s64 put = initial_put + 1;
+	int send_IPI = 0;
+
+
+	while (1) {
+
+		while (1) {
+			if (put == (volatile s64) ch->w_local_GP.put) {
+				break;
+			}
+
+			msg = (struct xpc_msg *) ((u64) ch->local_msgqueue +
+			       (put % ch->local_nentries) * ch->msg_size);
+
+			if (!(msg->flags & XPC_M_READY)) {
+				break;
+			}
+
+			put++;
+		}
+
+		if (put == initial_put) {
+			/* nothing's changed */
+			break;
+		}
+
+		if (cmpxchg_rel(&ch->local_GP->put, initial_put, put) !=
+								initial_put) {
+			/* someone else beat us to it */
+			DBUG_ON((volatile s64) ch->local_GP->put < initial_put);
+			break;
+		}
+
+		/* we just set the new value of local_GP->put */
+
+		dev_dbg(xpc_chan, "local_GP->put changed to %ld, partid=%d, "
+			"channel=%d\n", put, ch->partid, ch->number);
+
+		send_IPI = 1;
+
+		/*
+		 * We need to ensure that the message referenced by
+		 * local_GP->put is not XPC_M_READY or that local_GP->put
+		 * equals w_local_GP.put, so we'll go have a look.
+		 */
+		initial_put = put;
+	}
+
+	if (send_IPI) {
+		xpc_IPI_send_msgrequest(ch);
+	}
+}
+
+
+/*
+ * Common code that does the actual sending of the message by advancing the
+ * local message queue's Put value and sends an IPI to the partition the
+ * message is being sent to.
+ */
+static enum xpc_retval
+xpc_send_msg(struct xpc_channel *ch, struct xpc_msg *msg, u8 notify_type,
+			xpc_notify_func func, void *key)
+{
+	enum xpc_retval ret = xpcSuccess;
+	struct xpc_notify *notify = NULL;   // >>> to keep the compiler happy!!
+	s64 put, msg_number = msg->number;
+
+
+	DBUG_ON(notify_type == XPC_N_CALL && func == NULL);
+	DBUG_ON((((u64) msg - (u64) ch->local_msgqueue) / ch->msg_size) !=
+					msg_number % ch->local_nentries);
+	DBUG_ON(msg->flags & XPC_M_READY);
+
+	if (ch->flags & XPC_C_DISCONNECTING) {
+		/* drop the reference grabbed in xpc_allocate_msg() */
+		xpc_msgqueue_deref(ch);
+		return ch->reason;
+	}
+
+	if (notify_type != 0) {
+		/*
+		 * Tell the remote side to send an ACK interrupt when the
+		 * message has been delivered.
+		 */
+		msg->flags |= XPC_M_INTERRUPT;
+
+		atomic_inc(&ch->n_to_notify);
+
+		notify = &ch->notify_queue[msg_number % ch->local_nentries];
+		notify->func = func;
+		notify->key = key;
+		(volatile u8) notify->type = notify_type;
+
+		// >>> is a mb() needed here?
+
+		if (ch->flags & XPC_C_DISCONNECTING) {
+			/*
+			 * An error occurred between our last error check and
+			 * this one. We will try to clear the type field from
+			 * the notify entry. If we succeed then
+			 * xpc_disconnect_channel() didn't already process
+			 * the notify entry.
+			 */
+			if (cmpxchg(&notify->type, notify_type, 0) ==
+								notify_type) {
+				atomic_dec(&ch->n_to_notify);
+				ret = ch->reason;
+			}
+
+			/* drop the reference grabbed in xpc_allocate_msg() */
+			xpc_msgqueue_deref(ch);
+			return ret;
+		}
+	}
+
+	msg->flags |= XPC_M_READY;
+
+	/*
+	 * The preceding store of msg->flags must occur before the following
+	 * load of ch->local_GP->put.
+	 */
+	mb();
+
+	/* see if the message is next in line to be sent, if so send it */
+
+	put = ch->local_GP->put;
+	if (put == msg_number) {
+		xpc_send_msgs(ch, put);
+	}
+
+	/* drop the reference grabbed in xpc_allocate_msg() */
+	xpc_msgqueue_deref(ch);
+	return ret;
+}
+
+
+/*
+ * Send a message previously allocated using xpc_initiate_allocate() on the
+ * specified channel connected to the specified partition.
+ *
+ * This routine will not wait for the message to be received, nor will
+ * notification be given when it does happen. Once this routine has returned
+ * the message entry allocated via xpc_initiate_allocate() is no longer
+ * accessable to the caller.
+ *
+ * This routine, although called by users, does not call xpc_part_ref() to
+ * ensure that the partition infrastructure is in place. It relies on the
+ * fact that we called xpc_msgqueue_ref() in xpc_allocate_msg().
+ *
+ * Arguments:
+ *
+ *	partid - ID of partition to which the channel is connected.
+ *	ch_number - channel # to send message on.
+ *	payload - pointer to the payload area allocated via
+ *			xpc_initiate_allocate().
+ */
+enum xpc_retval
+xpc_initiate_send(partid_t partid, int ch_number, void *payload)
+{
+	struct xpc_partition *part = &xpc_partitions[partid];
+	struct xpc_msg *msg = XPC_MSG_ADDRESS(payload);
+	enum xpc_retval ret;
+
+
+	dev_dbg(xpc_chan, "msg=0x%p, partid=%d, channel=%d\n", (void *) msg,
+		partid, ch_number);
+
+	DBUG_ON(partid <= 0 || partid >= XP_MAX_PARTITIONS);
+	DBUG_ON(ch_number < 0 || ch_number >= part->nchannels);
+	DBUG_ON(msg == NULL);
+
+	ret = xpc_send_msg(&part->channels[ch_number], msg, 0, NULL, NULL);
+
+	return ret;
+}
+
+
+/*
+ * Send a message previously allocated using xpc_initiate_allocate on the
+ * specified channel connected to the specified partition.
+ *
+ * This routine will not wait for the message to be sent. Once this routine
+ * has returned the message entry allocated via xpc_initiate_allocate() is no
+ * longer accessable to the caller.
+ *
+ * Once the remote end of the channel has received the message, the function
+ * passed as an argument to xpc_initiate_send_notify() will be called. This
+ * allows the sender to free up or re-use any buffers referenced by the
+ * message, but does NOT mean the message has been processed at the remote
+ * end by a receiver.
+ *
+ * If this routine returns an error, the caller's function will NOT be called.
+ *
+ * This routine, although called by users, does not call xpc_part_ref() to
+ * ensure that the partition infrastructure is in place. It relies on the
+ * fact that we called xpc_msgqueue_ref() in xpc_allocate_msg().
+ *
+ * Arguments:
+ *
+ *	partid - ID of partition to which the channel is connected.
+ *	ch_number - channel # to send message on.
+ *	payload - pointer to the payload area allocated via
+ *			xpc_initiate_allocate().
+ *	func - function to call with asynchronous notification of message
+ *		  receipt. THIS FUNCTION MUST BE NON-BLOCKING.
+ *	key - user-defined key to be passed to the function when it's called.
+ */
+enum xpc_retval
+xpc_initiate_send_notify(partid_t partid, int ch_number, void *payload,
+				xpc_notify_func func, void *key)
+{
+	struct xpc_partition *part = &xpc_partitions[partid];
+	struct xpc_msg *msg = XPC_MSG_ADDRESS(payload);
+	enum xpc_retval ret;
+
+
+	dev_dbg(xpc_chan, "msg=0x%p, partid=%d, channel=%d\n", (void *) msg,
+		partid, ch_number);
+
+	DBUG_ON(partid <= 0 || partid >= XP_MAX_PARTITIONS);
+	DBUG_ON(ch_number < 0 || ch_number >= part->nchannels);
+	DBUG_ON(msg == NULL);
+	DBUG_ON(func == NULL);
+
+	ret = xpc_send_msg(&part->channels[ch_number], msg, XPC_N_CALL,
+								func, key);
+	return ret;
+}
+
+
+static struct xpc_msg *
+xpc_pull_remote_msg(struct xpc_channel *ch, s64 get)
+{
+	struct xpc_partition *part = &xpc_partitions[ch->partid];
+	struct xpc_msg *remote_msg, *msg;
+	u32 msg_index, nmsgs;
+	u64 msg_offset;
+	enum xpc_retval ret;
+
+
+	if (down_interruptible(&ch->msg_to_pull_sema) != 0) {
+		/* we were interrupted by a signal */
+		return NULL;
+	}
+
+	while (get >= ch->next_msg_to_pull) {
+
+		/* pull as many messages as are ready and able to be pulled */
+
+		msg_index = ch->next_msg_to_pull % ch->remote_nentries;
+
+		DBUG_ON(ch->next_msg_to_pull >=
+					(volatile s64) ch->w_remote_GP.put);
+		nmsgs =  (volatile s64) ch->w_remote_GP.put -
+						ch->next_msg_to_pull;
+		if (msg_index + nmsgs > ch->remote_nentries) {
+			/* ignore the ones that wrap the msg queue for now */
+			nmsgs = ch->remote_nentries - msg_index;
+		}
+
+		msg_offset = msg_index * ch->msg_size;
+		msg = (struct xpc_msg *) ((u64) ch->remote_msgqueue +
+								msg_offset);
+		remote_msg = (struct xpc_msg *) (ch->remote_msgqueue_pa +
+								msg_offset);
+
+		if ((ret = xpc_pull_remote_cachelines(part, msg, remote_msg,
+				nmsgs * ch->msg_size)) != xpcSuccess) {
+
+			dev_dbg(xpc_chan, "failed to pull %d msgs starting with"
+				" msg %ld from partition %d, channel=%d, "
+				"ret=%d\n", nmsgs, ch->next_msg_to_pull,
+				ch->partid, ch->number, ret);
+
+			XPC_DEACTIVATE_PARTITION(part, ret);
+
+			up(&ch->msg_to_pull_sema);
+			return NULL;
+		}
+
+		mb();	/* >>> this may not be needed, we're not sure */
+
+		ch->next_msg_to_pull += nmsgs;
+	}
+
+	up(&ch->msg_to_pull_sema);
+
+	/* return the message we were looking for */
+	msg_offset = (get % ch->remote_nentries) * ch->msg_size;
+	msg = (struct xpc_msg *) ((u64) ch->remote_msgqueue + msg_offset);
+
+	return msg;
+}
+
+
+/*
+ * Get a message to be delivered.
+ */
+static struct xpc_msg *
+xpc_get_deliverable_msg(struct xpc_channel *ch)
+{
+	struct xpc_msg *msg = NULL;
+	s64 get;
+
+
+	do {
+		if ((volatile u32) ch->flags & XPC_C_DISCONNECTING) {
+			break;
+		}
+
+		get = (volatile s64) ch->w_local_GP.get;
+		if (get == (volatile s64) ch->w_remote_GP.put) {
+			break;
+		}
+
+		/* There are messages waiting to be pulled and delivered.
+		 * We need to try to secure one for ourselves. We'll do this
+		 * by trying to increment w_local_GP.get and hope that no one
+		 * else beats us to it. If they do, we'll we'll simply have
+		 * to try again for the next one.
+	 	 */
+
+		if (cmpxchg(&ch->w_local_GP.get, get, get + 1) == get) {
+			/* we got the entry referenced by get */
+
+			dev_dbg(xpc_chan, "w_local_GP.get changed to %ld, "
+				"partid=%d, channel=%d\n", get + 1,
+				ch->partid, ch->number);
+
+			/* pull the message from the remote partition */
+
+			msg = xpc_pull_remote_msg(ch, get);
+
+			DBUG_ON(msg != NULL && msg->number != get);
+			DBUG_ON(msg != NULL && (msg->flags & XPC_M_DONE));
+			DBUG_ON(msg != NULL && !(msg->flags & XPC_M_READY));
+
+			break;
+		}
+
+	} while (1);
+
+	return msg;
+}
+
+
+/*
+ * Deliver a message to its intended recipient.
+ */
+void
+xpc_deliver_msg(struct xpc_channel *ch)
+{
+	struct xpc_msg *msg;
+
+
+	if ((msg = xpc_get_deliverable_msg(ch)) != NULL) {
+
+		/*
+		 * This ref is taken to protect the payload itself from being
+		 * freed before the user is finished with it, which the user
+		 * indicates by calling xpc_initiate_received().
+		 */
+		xpc_msgqueue_ref(ch);
+
+		atomic_inc(&ch->kthreads_active);
+
+		if (ch->func != NULL) {
+			dev_dbg(xpc_chan, "ch->func() called, msg=0x%p, "
+				"msg_number=%ld, partid=%d, channel=%d\n",
+				(void *) msg, msg->number, ch->partid,
+				ch->number);
+
+			/* deliver the message to its intended recipient */
+			ch->func(xpcMsgReceived, ch->partid, ch->number,
+					&msg->payload, ch->key);
+
+			dev_dbg(xpc_chan, "ch->func() returned, msg=0x%p, "
+				"msg_number=%ld, partid=%d, channel=%d\n",
+				(void *) msg, msg->number, ch->partid,
+				ch->number);
+		}
+
+		atomic_dec(&ch->kthreads_active);
+	}
+}
+
+
+/*
+ * Now we actually acknowledge the messages that have been delivered and ack'd
+ * by advancing the cached remote message queue's Get value and if requested
+ * send an IPI to the message sender's partition.
+ */
+static void
+xpc_acknowledge_msgs(struct xpc_channel *ch, s64 initial_get, u8 msg_flags)
+{
+	struct xpc_msg *msg;
+	s64 get = initial_get + 1;
+	int send_IPI = 0;
+
+
+	while (1) {
+
+		while (1) {
+			if (get == (volatile s64) ch->w_local_GP.get) {
+				break;
+			}
+
+			msg = (struct xpc_msg *) ((u64) ch->remote_msgqueue +
+			       (get % ch->remote_nentries) * ch->msg_size);
+
+			if (!(msg->flags & XPC_M_DONE)) {
+				break;
+			}
+
+			msg_flags |= msg->flags;
+			get++;
+		}
+
+		if (get == initial_get) {
+			/* nothing's changed */
+			break;
+		}
+
+		if (cmpxchg_rel(&ch->local_GP->get, initial_get, get) !=
+								initial_get) {
+			/* someone else beat us to it */
+			DBUG_ON((volatile s64) ch->local_GP->get <=
+								initial_get);
+			break;
+		}
+
+		/* we just set the new value of local_GP->get */
+
+		dev_dbg(xpc_chan, "local_GP->get changed to %ld, partid=%d, "
+			"channel=%d\n", get, ch->partid, ch->number);
+
+		send_IPI = (msg_flags & XPC_M_INTERRUPT);
+
+		/*
+		 * We need to ensure that the message referenced by
+		 * local_GP->get is not XPC_M_DONE or that local_GP->get
+		 * equals w_local_GP.get, so we'll go have a look.
+		 */
+		initial_get = get;
+	}
+
+	if (send_IPI) {
+		xpc_IPI_send_msgrequest(ch);
+	}
+}
+
+
+/*
+ * Acknowledge receipt of a delivered message.
+ *
+ * If a message has XPC_M_INTERRUPT set, send an interrupt to the partition
+ * that sent the message.
+ *
+ * This function, although called by users, does not call xpc_part_ref() to
+ * ensure that the partition infrastructure is in place. It relies on the
+ * fact that we called xpc_msgqueue_ref() in xpc_deliver_msg().
+ *
+ * Arguments:
+ *
+ *	partid - ID of partition to which the channel is connected.
+ *	ch_number - channel # message received on.
+ *	payload - pointer to the payload area allocated via
+ *			xpc_initiate_allocate().
+ */
+void
+xpc_initiate_received(partid_t partid, int ch_number, void *payload)
+{
+	struct xpc_partition *part = &xpc_partitions[partid];
+	struct xpc_channel *ch;
+	struct xpc_msg *msg = XPC_MSG_ADDRESS(payload);
+	s64 get, msg_number = msg->number;
+
+
+	DBUG_ON(partid <= 0 || partid >= XP_MAX_PARTITIONS);
+	DBUG_ON(ch_number < 0 || ch_number >= part->nchannels);
+
+	ch = &part->channels[ch_number];
+
+	dev_dbg(xpc_chan, "msg=0x%p, msg_number=%ld, partid=%d, channel=%d\n",
+		(void *) msg, msg_number, ch->partid, ch->number);
+
+	DBUG_ON((((u64) msg - (u64) ch->remote_msgqueue) / ch->msg_size) !=
+					msg_number % ch->remote_nentries);
+	DBUG_ON(msg->flags & XPC_M_DONE);
+
+	msg->flags |= XPC_M_DONE;
+
+	/*
+	 * The preceding store of msg->flags must occur before the following
+	 * load of ch->local_GP->get.
+	 */
+	mb();
+
+	/*
+	 * See if this message is next in line to be acknowledged as having
+	 * been delivered.
+	 */
+	get = ch->local_GP->get;
+	if (get == msg_number) {
+		xpc_acknowledge_msgs(ch, get, msg->flags);
+	}
+
+	/* the call to xpc_msgqueue_ref() was done by xpc_deliver_msg()  */
+	xpc_msgqueue_deref(ch);
+}
+

arch/ia64/sn/kernel/xpc_main.c

@@ -0,0 +1,1064 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 2004-2005 Silicon Graphics, Inc.  All Rights Reserved.
+ */
+
+
+/*
+ * Cross Partition Communication (XPC) support - standard version.
+ *
+ *	XPC provides a message passing capability that crosses partition
+ *	boundaries. This module is made up of two parts:
+ *
+ *	    partition	This part detects the presence/absence of other
+ *			partitions. It provides a heartbeat and monitors
+ *			the heartbeats of other partitions.
+ *
+ *	    channel	This part manages the channels and sends/receives
+ *			messages across them to/from other partitions.
+ *
+ *	There are a couple of additional functions residing in XP, which
+ *	provide an interface to XPC for its users.
+ *
+ *
+ *	Caveats:
+ *
+ *	  . We currently have no way to determine which nasid an IPI came
+ *	    from. Thus, xpc_IPI_send() does a remote AMO write followed by
+ *	    an IPI. The AMO indicates where data is to be pulled from, so
+ *	    after the IPI arrives, the remote partition checks the AMO word.
+ *	    The IPI can actually arrive before the AMO however, so other code
+ *	    must periodically check for this case. Also, remote AMO operations
+ *	    do not reliably time out. Thus we do a remote PIO read solely to
+ *	    know whether the remote partition is down and whether we should
+ *	    stop sending IPIs to it. This remote PIO read operation is set up
+ *	    in a special nofault region so SAL knows to ignore (and cleanup)
+ *	    any errors due to the remote AMO write, PIO read, and/or PIO
+ *	    write operations.
+ *
+ *	    If/when new hardware solves this IPI problem, we should abandon
+ *	    the current approach.
+ *
+ */
+
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/syscalls.h>
+#include <linux/cache.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <asm/sn/intr.h>
+#include <asm/sn/sn_sal.h>
+#include <asm/uaccess.h>
+#include "xpc.h"
+
+
+/* define two XPC debug device structures to be used with dev_dbg() et al */
+
+struct device_driver xpc_dbg_name = {
+	.name = "xpc"
+};
+
+struct device xpc_part_dbg_subname = {
+	.bus_id = {0},		/* set to "part" at xpc_init() time */
+	.driver = &xpc_dbg_name
+};
+
+struct device xpc_chan_dbg_subname = {
+	.bus_id = {0},		/* set to "chan" at xpc_init() time */
+	.driver = &xpc_dbg_name
+};
+
+struct device *xpc_part = &xpc_part_dbg_subname;
+struct device *xpc_chan = &xpc_chan_dbg_subname;
+
+
+/* systune related variables for /proc/sys directories */
+
+static int xpc_hb_min = 1;
+static int xpc_hb_max = 10;
+
+static int xpc_hb_check_min = 10;
+static int xpc_hb_check_max = 120;
+
+static ctl_table xpc_sys_xpc_hb_dir[] = {
+	{
+		1,
+		"hb_interval",
+		&xpc_hb_interval,
+		sizeof(int),
+		0644,
+		NULL,
+		&proc_dointvec_minmax,
+		&sysctl_intvec,
+		NULL,
+		&xpc_hb_min, &xpc_hb_max
+	},
+	{
+		2,
+		"hb_check_interval",
+		&xpc_hb_check_interval,
+		sizeof(int),
+		0644,
+		NULL,
+		&proc_dointvec_minmax,
+		&sysctl_intvec,
+		NULL,
+		&xpc_hb_check_min, &xpc_hb_check_max
+	},
+	{0}
+};
+static ctl_table xpc_sys_xpc_dir[] = {
+	{
+		1,
+		"hb",
+		NULL,
+		0,
+		0555,
+		xpc_sys_xpc_hb_dir
+	},
+	{0}
+};
+static ctl_table xpc_sys_dir[] = {
+	{
+		1,
+		"xpc",
+		NULL,
+		0,
+		0555,
+		xpc_sys_xpc_dir
+	},
+	{0}
+};
+static struct ctl_table_header *xpc_sysctl;
+
+
+/* #of IRQs received */
+static atomic_t xpc_act_IRQ_rcvd;
+
+/* IRQ handler notifies this wait queue on receipt of an IRQ */
+static DECLARE_WAIT_QUEUE_HEAD(xpc_act_IRQ_wq);
+
+static unsigned long xpc_hb_check_timeout;
+
+/* xpc_hb_checker thread exited notification */
+static DECLARE_MUTEX_LOCKED(xpc_hb_checker_exited);
+
+/* xpc_discovery thread exited notification */
+static DECLARE_MUTEX_LOCKED(xpc_discovery_exited);
+
+
+static struct timer_list xpc_hb_timer;
+
+
+static void xpc_kthread_waitmsgs(struct xpc_partition *, struct xpc_channel *);
+
+
+/*
+ * Notify the heartbeat check thread that an IRQ has been received.
+ */
+static irqreturn_t
+xpc_act_IRQ_handler(int irq, void *dev_id, struct pt_regs *regs)
+{
+	atomic_inc(&xpc_act_IRQ_rcvd);
+	wake_up_interruptible(&xpc_act_IRQ_wq);
+	return IRQ_HANDLED;
+}
+
+
+/*
+ * Timer to produce the heartbeat.  The timer structures function is
+ * already set when this is initially called.  A tunable is used to
+ * specify when the next timeout should occur.
+ */
+static void
+xpc_hb_beater(unsigned long dummy)
+{
+	xpc_vars->heartbeat++;
+
+	if (jiffies >= xpc_hb_check_timeout) {
+		wake_up_interruptible(&xpc_act_IRQ_wq);
+	}
+
+	xpc_hb_timer.expires = jiffies + (xpc_hb_interval * HZ);
+	add_timer(&xpc_hb_timer);
+}
+
+
+/*
+ * This thread is responsible for nearly all of the partition
+ * activation/deactivation.
+ */
+static int
+xpc_hb_checker(void *ignore)
+{
+	int last_IRQ_count = 0;
+	int new_IRQ_count;
+	int force_IRQ=0;
+
+
+	/* this thread was marked active by xpc_hb_init() */
+
+	daemonize(XPC_HB_CHECK_THREAD_NAME);
+
+	set_cpus_allowed(current, cpumask_of_cpu(XPC_HB_CHECK_CPU));
+
+	xpc_hb_check_timeout = jiffies + (xpc_hb_check_interval * HZ);
+
+	while (!(volatile int) xpc_exiting) {
+
+		/* wait for IRQ or timeout */
+		(void) wait_event_interruptible(xpc_act_IRQ_wq,
+			    (last_IRQ_count < atomic_read(&xpc_act_IRQ_rcvd) ||
+					jiffies >= xpc_hb_check_timeout ||
+						(volatile int) xpc_exiting));
+
+		dev_dbg(xpc_part, "woke up with %d ticks rem; %d IRQs have "
+			"been received\n",
+			(int) (xpc_hb_check_timeout - jiffies),
+			atomic_read(&xpc_act_IRQ_rcvd) - last_IRQ_count);
+
+
+		/* checking of remote heartbeats is skewed by IRQ handling */
+		if (jiffies >= xpc_hb_check_timeout) {
+			dev_dbg(xpc_part, "checking remote heartbeats\n");
+			xpc_check_remote_hb();
+
+			/*
+			 * We need to periodically recheck to ensure no
+			 * IPI/AMO pairs have been missed.  That check
+			 * must always reset xpc_hb_check_timeout.
+			 */
+			force_IRQ = 1;
+		}
+
+
+		new_IRQ_count = atomic_read(&xpc_act_IRQ_rcvd);
+		if (last_IRQ_count < new_IRQ_count || force_IRQ != 0) {
+			force_IRQ = 0;
+
+			dev_dbg(xpc_part, "found an IRQ to process; will be "
+				"resetting xpc_hb_check_timeout\n");
+
+			last_IRQ_count += xpc_identify_act_IRQ_sender();
+			if (last_IRQ_count < new_IRQ_count) {
+				/* retry once to help avoid missing AMO */
+				(void) xpc_identify_act_IRQ_sender();
+			}
+			last_IRQ_count = new_IRQ_count;
+
+			xpc_hb_check_timeout = jiffies +
+					   (xpc_hb_check_interval * HZ);
+		}
+	}
+
+	dev_dbg(xpc_part, "heartbeat checker is exiting\n");
+
+
+	/* mark this thread as inactive */
+	up(&xpc_hb_checker_exited);
+	return 0;
+}
+
+
+/*
+ * This thread will attempt to discover other partitions to activate
+ * based on info provided by SAL. This new thread is short lived and
+ * will exit once discovery is complete.
+ */
+static int
+xpc_initiate_discovery(void *ignore)
+{
+	daemonize(XPC_DISCOVERY_THREAD_NAME);
+
+	xpc_discovery();
+
+	dev_dbg(xpc_part, "discovery thread is exiting\n");
+
+	/* mark this thread as inactive */
+	up(&xpc_discovery_exited);
+	return 0;
+}
+
+
+/*
+ * Establish first contact with the remote partititon. This involves pulling
+ * the XPC per partition variables from the remote partition and waiting for
+ * the remote partition to pull ours.
+ */
+static enum xpc_retval
+xpc_make_first_contact(struct xpc_partition *part)
+{
+	enum xpc_retval ret;
+
+
+	while ((ret = xpc_pull_remote_vars_part(part)) != xpcSuccess) {
+		if (ret != xpcRetry) {
+			XPC_DEACTIVATE_PARTITION(part, ret);
+			return ret;
+		}
+
+		dev_dbg(xpc_chan, "waiting to make first contact with "
+			"partition %d\n", XPC_PARTID(part));
+
+		/* wait a 1/4 of a second or so */
+		set_current_state(TASK_INTERRUPTIBLE);
+		(void) schedule_timeout(0.25 * HZ);
+
+		if (part->act_state == XPC_P_DEACTIVATING) {
+			return part->reason;
+		}
+	}
+
+	return xpc_mark_partition_active(part);
+}
+
+
+/*
+ * The first kthread assigned to a newly activated partition is the one
+ * created by XPC HB with which it calls xpc_partition_up(). XPC hangs on to
+ * that kthread until the partition is brought down, at which time that kthread
+ * returns back to XPC HB. (The return of that kthread will signify to XPC HB
+ * that XPC has dismantled all communication infrastructure for the associated
+ * partition.) This kthread becomes the channel manager for that partition.
+ *
+ * Each active partition has a channel manager, who, besides connecting and
+ * disconnecting channels, will ensure that each of the partition's connected
+ * channels has the required number of assigned kthreads to get the work done.
+ */
+static void
+xpc_channel_mgr(struct xpc_partition *part)
+{
+	while (part->act_state != XPC_P_DEACTIVATING ||
+				atomic_read(&part->nchannels_active) > 0) {
+
+		xpc_process_channel_activity(part);
+
+
+		/*
+		 * Wait until we've been requested to activate kthreads or
+		 * all of the channel's message queues have been torn down or
+		 * a signal is pending.
+		 *
+		 * The channel_mgr_requests is set to 1 after being awakened,
+		 * This is done to prevent the channel mgr from making one pass
+		 * through the loop for each request, since he will
+		 * be servicing all the requests in one pass. The reason it's
+		 * set to 1 instead of 0 is so that other kthreads will know
+		 * that the channel mgr is running and won't bother trying to
+		 * wake him up.
+		 */
+		atomic_dec(&part->channel_mgr_requests);
+		(void) wait_event_interruptible(part->channel_mgr_wq,
+				(atomic_read(&part->channel_mgr_requests) > 0 ||
+				(volatile u64) part->local_IPI_amo != 0 ||
+				((volatile u8) part->act_state ==
+							XPC_P_DEACTIVATING &&
+				atomic_read(&part->nchannels_active) == 0)));
+		atomic_set(&part->channel_mgr_requests, 1);
+
+		// >>> Does it need to wakeup periodically as well? In case we
+		// >>> miscalculated the #of kthreads to wakeup or create?
+	}
+}
+
+
+/*
+ * When XPC HB determines that a partition has come up, it will create a new
+ * kthread and that kthread will call this function to attempt to set up the
+ * basic infrastructure used for Cross Partition Communication with the newly
+ * upped partition.
+ *
+ * The kthread that was created by XPC HB and which setup the XPC
+ * infrastructure will remain assigned to the partition until the partition
+ * goes down. At which time the kthread will teardown the XPC infrastructure
+ * and then exit.
+ *
+ * XPC HB will put the remote partition's XPC per partition specific variables
+ * physical address into xpc_partitions[partid].remote_vars_part_pa prior to
+ * calling xpc_partition_up().
+ */
+static void
+xpc_partition_up(struct xpc_partition *part)
+{
+	DBUG_ON(part->channels != NULL);
+
+	dev_dbg(xpc_chan, "activating partition %d\n", XPC_PARTID(part));
+
+	if (xpc_setup_infrastructure(part) != xpcSuccess) {
+		return;
+	}
+
+	/*
+	 * The kthread that XPC HB called us with will become the
+	 * channel manager for this partition. It will not return
+	 * back to XPC HB until the partition's XPC infrastructure
+	 * has been dismantled.
+	 */
+
+	(void) xpc_part_ref(part);	/* this will always succeed */
+
+	if (xpc_make_first_contact(part) == xpcSuccess) {
+		xpc_channel_mgr(part);
+	}
+
+	xpc_part_deref(part);
+
+	xpc_teardown_infrastructure(part);
+}
+
+
+static int
+xpc_activating(void *__partid)
+{
+	partid_t partid = (u64) __partid;
+	struct xpc_partition *part = &xpc_partitions[partid];
+	unsigned long irq_flags;
+	struct sched_param param = { sched_priority: MAX_USER_RT_PRIO - 1 };
+	int ret;
+
+
+	DBUG_ON(partid <= 0 || partid >= XP_MAX_PARTITIONS);
+
+	spin_lock_irqsave(&part->act_lock, irq_flags);
+
+	if (part->act_state == XPC_P_DEACTIVATING) {
+		part->act_state = XPC_P_INACTIVE;
+		spin_unlock_irqrestore(&part->act_lock, irq_flags);
+		part->remote_rp_pa = 0;
+		return 0;
+	}
+
+	/* indicate the thread is activating */
+	DBUG_ON(part->act_state != XPC_P_ACTIVATION_REQ);
+	part->act_state = XPC_P_ACTIVATING;
+
+	XPC_SET_REASON(part, 0, 0);
+	spin_unlock_irqrestore(&part->act_lock, irq_flags);
+
+	dev_dbg(xpc_part, "bringing partition %d up\n", partid);
+
+	daemonize("xpc%02d", partid);
+
+	/*
+	 * This thread needs to run at a realtime priority to prevent a
+	 * significant performance degradation.
+	 */
+	ret = sched_setscheduler(current, SCHED_FIFO, &param);
+	if (ret != 0) {
+		dev_warn(xpc_part, "unable to set pid %d to a realtime "
+			"priority, ret=%d\n", current->pid, ret);
+	}
+
+	/* allow this thread and its children to run on any CPU */
+	set_cpus_allowed(current, CPU_MASK_ALL);
+
+	/*
+	 * Register the remote partition's AMOs with SAL so it can handle
+	 * and cleanup errors within that address range should the remote
+	 * partition go down. We don't unregister this range because it is
+	 * difficult to tell when outstanding writes to the remote partition
+	 * are finished and thus when it is safe to unregister. This should
+	 * not result in wasted space in the SAL xp_addr_region table because
+	 * we should get the same page for remote_amos_page_pa after module
+	 * reloads and system reboots.
+	 */
+	if (sn_register_xp_addr_region(part->remote_amos_page_pa,
+							PAGE_SIZE, 1) < 0) {
+		dev_warn(xpc_part, "xpc_partition_up(%d) failed to register "
+			"xp_addr region\n", partid);
+
+		spin_lock_irqsave(&part->act_lock, irq_flags);
+		part->act_state = XPC_P_INACTIVE;
+		XPC_SET_REASON(part, xpcPhysAddrRegFailed, __LINE__);
+		spin_unlock_irqrestore(&part->act_lock, irq_flags);
+		part->remote_rp_pa = 0;
+		return 0;
+	}
+
+	XPC_ALLOW_HB(partid, xpc_vars);
+	xpc_IPI_send_activated(part);
+
+
+	/*
+	 * xpc_partition_up() holds this thread and marks this partition as
+	 * XPC_P_ACTIVE by calling xpc_hb_mark_active().
+	 */
+	(void) xpc_partition_up(part);
+
+	xpc_mark_partition_inactive(part);
+
+	if (part->reason == xpcReactivating) {
+		/* interrupting ourselves results in activating partition */
+		xpc_IPI_send_reactivate(part);
+	}
+
+	return 0;
+}
+
+
+void
+xpc_activate_partition(struct xpc_partition *part)
+{
+	partid_t partid = XPC_PARTID(part);
+	unsigned long irq_flags;
+	pid_t pid;
+
+
+	spin_lock_irqsave(&part->act_lock, irq_flags);
+
+	pid = kernel_thread(xpc_activating, (void *) ((u64) partid), 0);
+
+	DBUG_ON(part->act_state != XPC_P_INACTIVE);
+
+	if (pid > 0) {
+		part->act_state = XPC_P_ACTIVATION_REQ;
+		XPC_SET_REASON(part, xpcCloneKThread, __LINE__);
+	} else {
+		XPC_SET_REASON(part, xpcCloneKThreadFailed, __LINE__);
+	}
+
+	spin_unlock_irqrestore(&part->act_lock, irq_flags);
+}
+
+
+/*
+ * Handle the receipt of a SGI_XPC_NOTIFY IRQ by seeing whether the specified
+ * partition actually sent it. Since SGI_XPC_NOTIFY IRQs may be shared by more
+ * than one partition, we use an AMO_t structure per partition to indicate
+ * whether a partition has sent an IPI or not.  >>> If it has, then wake up the
+ * associated kthread to handle it.
+ *
+ * All SGI_XPC_NOTIFY IRQs received by XPC are the result of IPIs sent by XPC
+ * running on other partitions.
+ *
+ * Noteworthy Arguments:
+ *
+ *	irq - Interrupt ReQuest number. NOT USED.
+ *
+ *	dev_id - partid of IPI's potential sender.
+ *
+ *	regs - processor's context before the processor entered
+ *	       interrupt code. NOT USED.
+ */
+irqreturn_t
+xpc_notify_IRQ_handler(int irq, void *dev_id, struct pt_regs *regs)
+{
+	partid_t partid = (partid_t) (u64) dev_id;
+	struct xpc_partition *part = &xpc_partitions[partid];
+
+
+	DBUG_ON(partid <= 0 || partid >= XP_MAX_PARTITIONS);
+
+	if (xpc_part_ref(part)) {
+		xpc_check_for_channel_activity(part);
+
+		xpc_part_deref(part);
+	}
+	return IRQ_HANDLED;
+}
+
+
+/*
+ * Check to see if xpc_notify_IRQ_handler() dropped any IPIs on the floor
+ * because the write to their associated IPI amo completed after the IRQ/IPI
+ * was received.
+ */
+void
+xpc_dropped_IPI_check(struct xpc_partition *part)
+{
+	if (xpc_part_ref(part)) {
+		xpc_check_for_channel_activity(part);
+
+		part->dropped_IPI_timer.expires = jiffies +
+							XPC_P_DROPPED_IPI_WAIT;
+		add_timer(&part->dropped_IPI_timer);
+		xpc_part_deref(part);
+	}
+}
+
+
+void
+xpc_activate_kthreads(struct xpc_channel *ch, int needed)
+{
+	int idle = atomic_read(&ch->kthreads_idle);
+	int assigned = atomic_read(&ch->kthreads_assigned);
+	int wakeup;
+
+
+	DBUG_ON(needed <= 0);
+
+	if (idle > 0) {
+		wakeup = (needed > idle) ? idle : needed;
+		needed -= wakeup;
+
+		dev_dbg(xpc_chan, "wakeup %d idle kthreads, partid=%d, "
+			"channel=%d\n", wakeup, ch->partid, ch->number);
+
+		/* only wakeup the requested number of kthreads */
+		wake_up_nr(&ch->idle_wq, wakeup);
+	}
+
+	if (needed <= 0) {
+		return;
+	}
+
+	if (needed + assigned > ch->kthreads_assigned_limit) {
+		needed = ch->kthreads_assigned_limit - assigned;
+		// >>>should never be less than 0
+		if (needed <= 0) {
+			return;
+		}
+	}
+
+	dev_dbg(xpc_chan, "create %d new kthreads, partid=%d, channel=%d\n",
+		needed, ch->partid, ch->number);
+
+	xpc_create_kthreads(ch, needed);
+}
+
+
+/*
+ * This function is where XPC's kthreads wait for messages to deliver.
+ */
+static void
+xpc_kthread_waitmsgs(struct xpc_partition *part, struct xpc_channel *ch)
+{
+	do {
+		/* deliver messages to their intended recipients */
+
+		while ((volatile s64) ch->w_local_GP.get <
+				(volatile s64) ch->w_remote_GP.put &&
+					!((volatile u32) ch->flags &
+						XPC_C_DISCONNECTING)) {
+			xpc_deliver_msg(ch);
+		}
+
+		if (atomic_inc_return(&ch->kthreads_idle) >
+						ch->kthreads_idle_limit) {
+			/* too many idle kthreads on this channel */
+			atomic_dec(&ch->kthreads_idle);
+			break;
+		}
+
+		dev_dbg(xpc_chan, "idle kthread calling "
+			"wait_event_interruptible_exclusive()\n");
+
+		(void) wait_event_interruptible_exclusive(ch->idle_wq,
+				((volatile s64) ch->w_local_GP.get <
+					(volatile s64) ch->w_remote_GP.put ||
+				((volatile u32) ch->flags &
+						XPC_C_DISCONNECTING)));
+
+		atomic_dec(&ch->kthreads_idle);
+
+	} while (!((volatile u32) ch->flags & XPC_C_DISCONNECTING));
+}
+
+
+static int
+xpc_daemonize_kthread(void *args)
+{
+	partid_t partid = XPC_UNPACK_ARG1(args);
+	u16 ch_number = XPC_UNPACK_ARG2(args);
+	struct xpc_partition *part = &xpc_partitions[partid];
+	struct xpc_channel *ch;
+	int n_needed;
+
+
+	daemonize("xpc%02dc%d", partid, ch_number);
+
+	dev_dbg(xpc_chan, "kthread starting, partid=%d, channel=%d\n",
+		partid, ch_number);
+
+	ch = &part->channels[ch_number];
+
+	if (!(ch->flags & XPC_C_DISCONNECTING)) {
+		DBUG_ON(!(ch->flags & XPC_C_CONNECTED));
+
+		/* let registerer know that connection has been established */
+
+		if (atomic_read(&ch->kthreads_assigned) == 1) {
+			xpc_connected_callout(ch);
+
+			/*
+			 * It is possible that while the callout was being
+			 * made that the remote partition sent some messages.
+			 * If that is the case, we may need to activate
+			 * additional kthreads to help deliver them. We only
+			 * need one less than total #of messages to deliver.
+			 */
+			n_needed = ch->w_remote_GP.put - ch->w_local_GP.get - 1;
+			if (n_needed > 0 &&
+					!(ch->flags & XPC_C_DISCONNECTING)) {
+				xpc_activate_kthreads(ch, n_needed);
+			}
+		}
+
+		xpc_kthread_waitmsgs(part, ch);
+	}
+
+	if (atomic_dec_return(&ch->kthreads_assigned) == 0 &&
+			((ch->flags & XPC_C_CONNECTCALLOUT) ||
+				(ch->reason != xpcUnregistering &&
+					ch->reason != xpcOtherUnregistering))) {
+		xpc_disconnected_callout(ch);
+	}
+
+
+	xpc_msgqueue_deref(ch);
+
+	dev_dbg(xpc_chan, "kthread exiting, partid=%d, channel=%d\n",
+		partid, ch_number);
+
+	xpc_part_deref(part);
+	return 0;
+}
+
+
+/*
+ * For each partition that XPC has established communications with, there is
+ * a minimum of one kernel thread assigned to perform any operation that
+ * may potentially sleep or block (basically the callouts to the asynchronous
+ * functions registered via xpc_connect()).
+ *
+ * Additional kthreads are created and destroyed by XPC as the workload
+ * demands.
+ *
+ * A kthread is assigned to one of the active channels that exists for a given
+ * partition.
+ */
+void
+xpc_create_kthreads(struct xpc_channel *ch, int needed)
+{
+	unsigned long irq_flags;
+	pid_t pid;
+	u64 args = XPC_PACK_ARGS(ch->partid, ch->number);
+
+
+	while (needed-- > 0) {
+		pid = kernel_thread(xpc_daemonize_kthread, (void *) args, 0);
+		if (pid < 0) {
+			/* the fork failed */
+
+			if (atomic_read(&ch->kthreads_assigned) <
+						ch->kthreads_idle_limit) {
+				/*
+				 * Flag this as an error only if we have an
+				 * insufficient #of kthreads for the channel
+				 * to function.
+				 *
+				 * No xpc_msgqueue_ref() is needed here since
+				 * the channel mgr is doing this.
+				 */
+				spin_lock_irqsave(&ch->lock, irq_flags);
+				XPC_DISCONNECT_CHANNEL(ch, xpcLackOfResources,
+								&irq_flags);
+				spin_unlock_irqrestore(&ch->lock, irq_flags);
+			}
+			break;
+		}
+
+		/*
+		 * The following is done on behalf of the newly created
+		 * kthread. That kthread is responsible for doing the
+		 * counterpart to the following before it exits.
+		 */
+		(void) xpc_part_ref(&xpc_partitions[ch->partid]);
+		xpc_msgqueue_ref(ch);
+		atomic_inc(&ch->kthreads_assigned);
+		ch->kthreads_created++;	// >>> temporary debug only!!!
+	}
+}
+
+
+void
+xpc_disconnect_wait(int ch_number)
+{
+	partid_t partid;
+	struct xpc_partition *part;
+	struct xpc_channel *ch;
+
+
+	/* now wait for all callouts to the caller's function to cease */
+	for (partid = 1; partid < XP_MAX_PARTITIONS; partid++) {
+		part = &xpc_partitions[partid];
+
+		if (xpc_part_ref(part)) {
+			ch = &part->channels[ch_number];
+
+// >>> how do we keep from falling into the window between our check and going
+// >>> down and coming back up where sema is re-inited?
+			if (ch->flags & XPC_C_SETUP) {
+				(void) down(&ch->teardown_sema);
+			}
+
+			xpc_part_deref(part);
+		}
+	}
+}
+
+
+static void
+xpc_do_exit(void)
+{
+	partid_t partid;
+	int active_part_count;
+	struct xpc_partition *part;
+
+
+	/* now it's time to eliminate our heartbeat */
+	del_timer_sync(&xpc_hb_timer);
+	xpc_vars->heartbeating_to_mask = 0;
+
+	/* indicate to others that our reserved page is uninitialized */
+	xpc_rsvd_page->vars_pa = 0;
+
+	/*
+	 * Ignore all incoming interrupts. Without interupts the heartbeat
+	 * checker won't activate any new partitions that may come up.
+	 */
+	free_irq(SGI_XPC_ACTIVATE, NULL);
+
+	/*
+	 * Cause the heartbeat checker and the discovery threads to exit.
+	 * We don't want them attempting to activate new partitions as we
+	 * try to deactivate the existing ones.
+	 */
+	xpc_exiting = 1;
+	wake_up_interruptible(&xpc_act_IRQ_wq);
+
+	/* wait for the heartbeat checker thread to mark itself inactive */
+	down(&xpc_hb_checker_exited);
+
+	/* wait for the discovery thread to mark itself inactive */
+	down(&xpc_discovery_exited);
+
+
+	set_current_state(TASK_INTERRUPTIBLE);
+	schedule_timeout(0.3 * HZ);
+	set_current_state(TASK_RUNNING);
+
+
+	/* wait for all partitions to become inactive */
+
+	do {
+		active_part_count = 0;
+
+		for (partid = 1; partid < XP_MAX_PARTITIONS; partid++) {
+			part = &xpc_partitions[partid];
+			if (part->act_state != XPC_P_INACTIVE) {
+				active_part_count++;
+
+				XPC_DEACTIVATE_PARTITION(part, xpcUnloading);
+			}
+		}
+
+		if (active_part_count) {
+			set_current_state(TASK_INTERRUPTIBLE);
+			schedule_timeout(0.3 * HZ);
+			set_current_state(TASK_RUNNING);
+		}
+
+	} while (active_part_count > 0);
+
+
+	/* close down protections for IPI operations */
+	xpc_restrict_IPI_ops();
+
+
+	/* clear the interface to XPC's functions */
+	xpc_clear_interface();
+
+	if (xpc_sysctl) {
+		unregister_sysctl_table(xpc_sysctl);
+	}
+}
+
+
+int __init
+xpc_init(void)
+{
+	int ret;
+	partid_t partid;
+	struct xpc_partition *part;
+	pid_t pid;
+
+
+	/*
+	 * xpc_remote_copy_buffer is used as a temporary buffer for bte_copy'ng
+	 * both a partition's reserved page and its XPC variables. Its size was
+	 * based on the size of a reserved page. So we need to ensure that the
+	 * XPC variables will fit as well.
+	 */
+	if (XPC_VARS_ALIGNED_SIZE > XPC_RSVD_PAGE_ALIGNED_SIZE) {
+		dev_err(xpc_part, "xpc_remote_copy_buffer is not big enough\n");
+		return -EPERM;
+	}
+	DBUG_ON((u64) xpc_remote_copy_buffer !=
+				L1_CACHE_ALIGN((u64) xpc_remote_copy_buffer));
+
+	snprintf(xpc_part->bus_id, BUS_ID_SIZE, "part");
+	snprintf(xpc_chan->bus_id, BUS_ID_SIZE, "chan");
+
+	xpc_sysctl = register_sysctl_table(xpc_sys_dir, 1);
+
+	/*
+	 * The first few fields of each entry of xpc_partitions[] need to
+	 * be initialized now so that calls to xpc_connect() and
+	 * xpc_disconnect() can be made prior to the activation of any remote
+	 * partition. NOTE THAT NONE OF THE OTHER FIELDS BELONGING TO THESE
+	 * ENTRIES ARE MEANINGFUL UNTIL AFTER AN ENTRY'S CORRESPONDING
+	 * PARTITION HAS BEEN ACTIVATED.
+	 */
+	for (partid = 1; partid < XP_MAX_PARTITIONS; partid++) {
+		part = &xpc_partitions[partid];
+
+		DBUG_ON((u64) part != L1_CACHE_ALIGN((u64) part));
+
+		part->act_IRQ_rcvd = 0;
+		spin_lock_init(&part->act_lock);
+		part->act_state = XPC_P_INACTIVE;
+		XPC_SET_REASON(part, 0, 0);
+		part->setup_state = XPC_P_UNSET;
+		init_waitqueue_head(&part->teardown_wq);
+		atomic_set(&part->references, 0);
+	}
+
+	/*
+	 * Open up protections for IPI operations (and AMO operations on
+	 * Shub 1.1 systems).
+	 */
+	xpc_allow_IPI_ops();
+
+	/*
+	 * Interrupts being processed will increment this atomic variable and
+	 * awaken the heartbeat thread which will process the interrupts.
+	 */
+	atomic_set(&xpc_act_IRQ_rcvd, 0);
+
+	/*
+	 * This is safe to do before the xpc_hb_checker thread has started
+	 * because the handler releases a wait queue.  If an interrupt is
+	 * received before the thread is waiting, it will not go to sleep,
+	 * but rather immediately process the interrupt.
+	 */
+	ret = request_irq(SGI_XPC_ACTIVATE, xpc_act_IRQ_handler, 0,
+							"xpc hb", NULL);
+	if (ret != 0) {
+		dev_err(xpc_part, "can't register ACTIVATE IRQ handler, "
+			"errno=%d\n", -ret);
+
+		xpc_restrict_IPI_ops();
+
+		if (xpc_sysctl) {
+			unregister_sysctl_table(xpc_sysctl);
+		}
+		return -EBUSY;
+	}
+
+	/*
+	 * Fill the partition reserved page with the information needed by
+	 * other partitions to discover we are alive and establish initial
+	 * communications.
+	 */
+	xpc_rsvd_page = xpc_rsvd_page_init();
+	if (xpc_rsvd_page == NULL) {
+		dev_err(xpc_part, "could not setup our reserved page\n");
+
+		free_irq(SGI_XPC_ACTIVATE, NULL);
+		xpc_restrict_IPI_ops();
+
+		if (xpc_sysctl) {
+			unregister_sysctl_table(xpc_sysctl);
+		}
+		return -EBUSY;
+	}
+
+
+	/*
+	 * Set the beating to other partitions into motion.  This is
+	 * the last requirement for other partitions' discovery to
+	 * initiate communications with us.
+	 */
+	init_timer(&xpc_hb_timer);
+	xpc_hb_timer.function = xpc_hb_beater;
+	xpc_hb_beater(0);
+
+
+	/*
+	 * The real work-horse behind xpc.  This processes incoming
+	 * interrupts and monitors remote heartbeats.
+	 */
+	pid = kernel_thread(xpc_hb_checker, NULL, 0);
+	if (pid < 0) {
+		dev_err(xpc_part, "failed while forking hb check thread\n");
+
+		/* indicate to others that our reserved page is uninitialized */
+		xpc_rsvd_page->vars_pa = 0;
+
+		del_timer_sync(&xpc_hb_timer);
+		free_irq(SGI_XPC_ACTIVATE, NULL);
+		xpc_restrict_IPI_ops();
+
+		if (xpc_sysctl) {
+			unregister_sysctl_table(xpc_sysctl);
+		}
+		return -EBUSY;
+	}
+
+
+	/*
+	 * Startup a thread that will attempt to discover other partitions to
+	 * activate based on info provided by SAL. This new thread is short
+	 * lived and will exit once discovery is complete.
+	 */
+	pid = kernel_thread(xpc_initiate_discovery, NULL, 0);
+	if (pid < 0) {
+		dev_err(xpc_part, "failed while forking discovery thread\n");
+
+		/* mark this new thread as a non-starter */
+		up(&xpc_discovery_exited);
+
+		xpc_do_exit();
+		return -EBUSY;
+	}
+
+
+	/* set the interface to point at XPC's functions */
+	xpc_set_interface(xpc_initiate_connect, xpc_initiate_disconnect,
+			  xpc_initiate_allocate, xpc_initiate_send,
+			  xpc_initiate_send_notify, xpc_initiate_received,
+			  xpc_initiate_partid_to_nasids);
+
+	return 0;
+}
+module_init(xpc_init);
+
+
+void __exit
+xpc_exit(void)
+{
+	xpc_do_exit();
+}
+module_exit(xpc_exit);
+
+
+MODULE_AUTHOR("Silicon Graphics, Inc.");
+MODULE_DESCRIPTION("Cross Partition Communication (XPC) support");
+MODULE_LICENSE("GPL");
+
+module_param(xpc_hb_interval, int, 0);
+MODULE_PARM_DESC(xpc_hb_interval, "Number of seconds between "
+		"heartbeat increments.");
+
+module_param(xpc_hb_check_interval, int, 0);
+MODULE_PARM_DESC(xpc_hb_check_interval, "Number of seconds between "
+		"heartbeat checks.");
+

arch/ia64/sn/kernel/xpc_partition.c

@@ -0,0 +1,984 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 2004-2005 Silicon Graphics, Inc.  All Rights Reserved.
+ */
+
+
+/*
+ * Cross Partition Communication (XPC) partition support.
+ *
+ *	This is the part of XPC that detects the presence/absence of
+ *	other partitions. It provides a heartbeat and monitors the
+ *	heartbeats of other partitions.
+ *
+ */
+
+
+#include <linux/kernel.h>
+#include <linux/sysctl.h>
+#include <linux/cache.h>
+#include <linux/mmzone.h>
+#include <linux/nodemask.h>
+#include <asm/sn/bte.h>
+#include <asm/sn/intr.h>
+#include <asm/sn/sn_sal.h>
+#include <asm/sn/nodepda.h>
+#include <asm/sn/addrs.h>
+#include "xpc.h"
+
+
+/* XPC is exiting flag */
+int xpc_exiting;
+
+
+/* SH_IPI_ACCESS shub register value on startup */
+static u64 xpc_sh1_IPI_access;
+static u64 xpc_sh2_IPI_access0;
+static u64 xpc_sh2_IPI_access1;
+static u64 xpc_sh2_IPI_access2;
+static u64 xpc_sh2_IPI_access3;
+
+
+/* original protection values for each node */
+u64 xpc_prot_vec[MAX_COMPACT_NODES];
+
+
+/* this partition's reserved page */
+struct xpc_rsvd_page *xpc_rsvd_page;
+
+/* this partition's XPC variables (within the reserved page) */
+struct xpc_vars *xpc_vars;
+struct xpc_vars_part *xpc_vars_part;
+
+
+/*
+ * For performance reasons, each entry of xpc_partitions[] is cacheline
+ * aligned. And xpc_partitions[] is padded with an additional entry at the
+ * end so that the last legitimate entry doesn't share its cacheline with
+ * another variable.
+ */
+struct xpc_partition xpc_partitions[XP_MAX_PARTITIONS + 1];
+
+
+/*
+ * Generic buffer used to store a local copy of the remote partitions
+ * reserved page or XPC variables.
+ *
+ * xpc_discovery runs only once and is a seperate thread that is
+ * very likely going to be processing in parallel with receiving
+ * interrupts.
+ */
+char ____cacheline_aligned
+		xpc_remote_copy_buffer[XPC_RSVD_PAGE_ALIGNED_SIZE];
+
+
+/* systune related variables */
+int xpc_hb_interval = XPC_HB_DEFAULT_INTERVAL;
+int xpc_hb_check_interval = XPC_HB_CHECK_DEFAULT_TIMEOUT;
+
+
+/*
+ * Given a nasid, get the physical address of the  partition's reserved page
+ * for that nasid. This function returns 0 on any error.
+ */
+static u64
+xpc_get_rsvd_page_pa(int nasid, u64 buf, u64 buf_size)
+{
+	bte_result_t bte_res;
+	s64 status;
+	u64 cookie = 0;
+	u64 rp_pa = nasid;	/* seed with nasid */
+	u64 len = 0;
+
+
+	while (1) {
+
+		status = sn_partition_reserved_page_pa(buf, &cookie, &rp_pa,
+								&len);
+
+		dev_dbg(xpc_part, "SAL returned with status=%li, cookie="
+			"0x%016lx, address=0x%016lx, len=0x%016lx\n",
+			status, cookie, rp_pa, len);
+
+		if (status != SALRET_MORE_PASSES) {
+			break;
+		}
+
+		if (len > buf_size) {
+			dev_err(xpc_part, "len (=0x%016lx) > buf_size\n", len);
+			status = SALRET_ERROR;
+			break;
+		}
+
+		bte_res = xp_bte_copy(rp_pa, ia64_tpa(buf), buf_size,
+					(BTE_NOTIFY | BTE_WACQUIRE), NULL);
+		if (bte_res != BTE_SUCCESS) {
+			dev_dbg(xpc_part, "xp_bte_copy failed %i\n", bte_res);
+			status = SALRET_ERROR;
+			break;
+		}
+	}
+
+	if (status != SALRET_OK) {
+		rp_pa = 0;
+	}
+	dev_dbg(xpc_part, "reserved page at phys address 0x%016lx\n", rp_pa);
+	return rp_pa;
+}
+
+
+/*
+ * Fill the partition reserved page with the information needed by
+ * other partitions to discover we are alive and establish initial
+ * communications.
+ */
+struct xpc_rsvd_page *
+xpc_rsvd_page_init(void)
+{
+	struct xpc_rsvd_page *rp;
+	AMO_t *amos_page;
+	u64 rp_pa, next_cl, nasid_array = 0;
+	int i, ret;
+
+
+	/* get the local reserved page's address */
+
+	rp_pa = xpc_get_rsvd_page_pa(cnodeid_to_nasid(0),
+					(u64) xpc_remote_copy_buffer,
+						XPC_RSVD_PAGE_ALIGNED_SIZE);
+	if (rp_pa == 0) {
+		dev_err(xpc_part, "SAL failed to locate the reserved page\n");
+		return NULL;
+	}
+	rp = (struct xpc_rsvd_page *) __va(rp_pa);
+
+	if (rp->partid != sn_partition_id) {
+		dev_err(xpc_part, "the reserved page's partid of %d should be "
+			"%d\n", rp->partid, sn_partition_id);
+		return NULL;
+	}
+
+	rp->version = XPC_RP_VERSION;
+
+	/*
+	 * Place the XPC variables on the cache line following the
+	 * reserved page structure.
+	 */
+	next_cl = (u64) rp + XPC_RSVD_PAGE_ALIGNED_SIZE;
+	xpc_vars = (struct xpc_vars *) next_cl;
+
+	/*
+	 * Before clearing xpc_vars, see if a page of AMOs had been previously
+	 * allocated. If not we'll need to allocate one and set permissions
+	 * so that cross-partition AMOs are allowed.
+	 *
+	 * The allocated AMO page needs MCA reporting to remain disabled after
+	 * XPC has unloaded.  To make this work, we keep a copy of the pointer
+	 * to this page (i.e., amos_page) in the struct xpc_vars structure,
+	 * which is pointed to by the reserved page, and re-use that saved copy
+	 * on subsequent loads of XPC. This AMO page is never freed, and its
+	 * memory protections are never restricted.
+	 */
+	if ((amos_page = xpc_vars->amos_page) == NULL) {
+		amos_page = (AMO_t *) mspec_kalloc_page(0);
+		if (amos_page == NULL) {
+			dev_err(xpc_part, "can't allocate page of AMOs\n");
+			return NULL;
+		}
+
+		/*
+		 * Open up AMO-R/W to cpu.  This is done for Shub 1.1 systems
+		 * when xpc_allow_IPI_ops() is called via xpc_hb_init().
+		 */
+		if (!enable_shub_wars_1_1()) {
+			ret = sn_change_memprotect(ia64_tpa((u64) amos_page),
+					PAGE_SIZE, SN_MEMPROT_ACCESS_CLASS_1,
+					&nasid_array);
+			if (ret != 0) {
+				dev_err(xpc_part, "can't change memory "
+					"protections\n");
+				mspec_kfree_page((unsigned long) amos_page);
+				return NULL;
+			}
+		}
+	} else if (!IS_AMO_ADDRESS((u64) amos_page)) {
+		/*
+		 * EFI's XPBOOT can also set amos_page in the reserved page,
+		 * but it happens to leave it as an uncached physical address
+		 * and we need it to be an uncached virtual, so we'll have to
+		 * convert it.
+		 */
+		if (!IS_AMO_PHYS_ADDRESS((u64) amos_page)) {
+			dev_err(xpc_part, "previously used amos_page address "
+				"is bad = 0x%p\n", (void *) amos_page);
+			return NULL;
+		}
+		amos_page = (AMO_t *) TO_AMO((u64) amos_page);
+	}
+
+	memset(xpc_vars, 0, sizeof(struct xpc_vars));
+
+	/*
+	 * Place the XPC per partition specific variables on the cache line
+	 * following the XPC variables structure.
+	 */
+	next_cl += XPC_VARS_ALIGNED_SIZE;
+	memset((u64 *) next_cl, 0, sizeof(struct xpc_vars_part) *
+							XP_MAX_PARTITIONS);
+	xpc_vars_part = (struct xpc_vars_part *) next_cl;
+	xpc_vars->vars_part_pa = __pa(next_cl);
+
+	xpc_vars->version = XPC_V_VERSION;
+	xpc_vars->act_nasid = cpuid_to_nasid(0);
+	xpc_vars->act_phys_cpuid = cpu_physical_id(0);
+	xpc_vars->amos_page = amos_page;  /* save for next load of XPC */
+
+
+	/*
+	 * Initialize the activation related AMO variables.
+	 */
+	xpc_vars->act_amos = xpc_IPI_init(XP_MAX_PARTITIONS);
+	for (i = 1; i < XP_NASID_MASK_WORDS; i++) {
+		xpc_IPI_init(i + XP_MAX_PARTITIONS);
+	}
+	/* export AMO page's physical address to other partitions */
+	xpc_vars->amos_page_pa = ia64_tpa((u64) xpc_vars->amos_page);
+
+	/*
+	 * This signifies to the remote partition that our reserved
+	 * page is initialized.
+	 */
+	(volatile u64) rp->vars_pa = __pa(xpc_vars);
+
+	return rp;
+}
+
+
+/*
+ * Change protections to allow IPI operations (and AMO operations on
+ * Shub 1.1 systems).
+ */
+void
+xpc_allow_IPI_ops(void)
+{
+	int node;
+	int nasid;
+
+
+	// >>> Change SH_IPI_ACCESS code to use SAL call once it is available.
+
+	if (is_shub2()) {
+		xpc_sh2_IPI_access0 =
+			(u64) HUB_L((u64 *) LOCAL_MMR_ADDR(SH2_IPI_ACCESS0));
+		xpc_sh2_IPI_access1 =
+			(u64) HUB_L((u64 *) LOCAL_MMR_ADDR(SH2_IPI_ACCESS1));
+		xpc_sh2_IPI_access2 =
+			(u64) HUB_L((u64 *) LOCAL_MMR_ADDR(SH2_IPI_ACCESS2));
+		xpc_sh2_IPI_access3 =
+			(u64) HUB_L((u64 *) LOCAL_MMR_ADDR(SH2_IPI_ACCESS3));
+
+		for_each_online_node(node) {
+			nasid = cnodeid_to_nasid(node);
+			HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS0),
+								-1UL);
+			HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS1),
+								-1UL);
+			HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS2),
+								-1UL);
+			HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS3),
+								-1UL);
+		}
+
+	} else {
+		xpc_sh1_IPI_access =
+			(u64) HUB_L((u64 *) LOCAL_MMR_ADDR(SH1_IPI_ACCESS));
+
+		for_each_online_node(node) {
+			nasid = cnodeid_to_nasid(node);
+			HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH1_IPI_ACCESS),
+								-1UL);
+
+			/*
+			 * Since the BIST collides with memory operations on
+			 * SHUB 1.1 sn_change_memprotect() cannot be used.
+			 */
+			if (enable_shub_wars_1_1()) {
+				/* open up everything */
+				xpc_prot_vec[node] = (u64) HUB_L((u64 *)
+						GLOBAL_MMR_ADDR(nasid,
+						SH1_MD_DQLP_MMR_DIR_PRIVEC0));
+				HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid,
+						SH1_MD_DQLP_MMR_DIR_PRIVEC0),
+								-1UL);
+				HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid,
+						SH1_MD_DQRP_MMR_DIR_PRIVEC0),
+								-1UL);
+			}
+		}
+	}
+}
+
+
+/*
+ * Restrict protections to disallow IPI operations (and AMO operations on
+ * Shub 1.1 systems).
+ */
+void
+xpc_restrict_IPI_ops(void)
+{
+	int node;
+	int nasid;
+
+
+	// >>> Change SH_IPI_ACCESS code to use SAL call once it is available.
+
+	if (is_shub2()) {
+
+		for_each_online_node(node) {
+			nasid = cnodeid_to_nasid(node);
+			HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS0),
+							xpc_sh2_IPI_access0);
+			HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS1),
+							xpc_sh2_IPI_access1);
+			HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS2),
+							xpc_sh2_IPI_access2);
+			HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS3),
+							xpc_sh2_IPI_access3);
+		}
+
+	} else {
+
+		for_each_online_node(node) {
+			nasid = cnodeid_to_nasid(node);
+			HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH1_IPI_ACCESS),
+							xpc_sh1_IPI_access);
+
+			if (enable_shub_wars_1_1()) {
+				HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid,
+						SH1_MD_DQLP_MMR_DIR_PRIVEC0),
+							xpc_prot_vec[node]);
+				HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid,
+						SH1_MD_DQRP_MMR_DIR_PRIVEC0),
+							xpc_prot_vec[node]);
+			}
+		}
+	}
+}
+
+
+/*
+ * At periodic intervals, scan through all active partitions and ensure
+ * their heartbeat is still active.  If not, the partition is deactivated.
+ */
+void
+xpc_check_remote_hb(void)
+{
+	struct xpc_vars *remote_vars;
+	struct xpc_partition *part;
+	partid_t partid;
+	bte_result_t bres;
+
+
+	remote_vars = (struct xpc_vars *) xpc_remote_copy_buffer;
+
+	for (partid = 1; partid < XP_MAX_PARTITIONS; partid++) {
+		if (partid == sn_partition_id) {
+			continue;
+		}
+
+		part = &xpc_partitions[partid];
+
+		if (part->act_state == XPC_P_INACTIVE ||
+				part->act_state == XPC_P_DEACTIVATING) {
+			continue;
+		}
+
+		/* pull the remote_hb cache line */
+		bres = xp_bte_copy(part->remote_vars_pa,
+					ia64_tpa((u64) remote_vars),
+					XPC_VARS_ALIGNED_SIZE,
+					(BTE_NOTIFY | BTE_WACQUIRE), NULL);
+		if (bres != BTE_SUCCESS) {
+			XPC_DEACTIVATE_PARTITION(part,
+						xpc_map_bte_errors(bres));
+			continue;
+		}
+
+		dev_dbg(xpc_part, "partid = %d, heartbeat = %ld, last_heartbeat"
+			" = %ld, kdb_status = %ld, HB_mask = 0x%lx\n", partid,
+			remote_vars->heartbeat, part->last_heartbeat,
+			remote_vars->kdb_status,
+			remote_vars->heartbeating_to_mask);
+
+		if (((remote_vars->heartbeat == part->last_heartbeat) &&
+			(remote_vars->kdb_status == 0)) ||
+			     !XPC_HB_ALLOWED(sn_partition_id, remote_vars)) {
+
+			XPC_DEACTIVATE_PARTITION(part, xpcNoHeartbeat);
+			continue;
+		}
+
+		part->last_heartbeat = remote_vars->heartbeat;
+	}
+}
+
+
+/*
+ * Get a copy of the remote partition's rsvd page.
+ *
+ * remote_rp points to a buffer that is cacheline aligned for BTE copies and
+ * assumed to be of size XPC_RSVD_PAGE_ALIGNED_SIZE.
+ */
+static enum xpc_retval
+xpc_get_remote_rp(int nasid, u64 *discovered_nasids,
+		struct xpc_rsvd_page *remote_rp, u64 *remote_rsvd_page_pa)
+{
+	int bres, i;
+
+
+	/* get the reserved page's physical address */
+
+	*remote_rsvd_page_pa = xpc_get_rsvd_page_pa(nasid, (u64) remote_rp,
+						XPC_RSVD_PAGE_ALIGNED_SIZE);
+	if (*remote_rsvd_page_pa == 0) {
+		return xpcNoRsvdPageAddr;
+	}
+
+
+	/* pull over the reserved page structure */
+
+	bres = xp_bte_copy(*remote_rsvd_page_pa, ia64_tpa((u64) remote_rp),
+				XPC_RSVD_PAGE_ALIGNED_SIZE,
+				(BTE_NOTIFY | BTE_WACQUIRE), NULL);
+	if (bres != BTE_SUCCESS) {
+		return xpc_map_bte_errors(bres);
+	}
+
+
+	if (discovered_nasids != NULL) {
+		for (i = 0; i < XP_NASID_MASK_WORDS; i++) {
+			discovered_nasids[i] |= remote_rp->part_nasids[i];
+		}
+	}
+
+
+	/* check that the partid is for another partition */
+
+	if (remote_rp->partid < 1 ||
+				remote_rp->partid > (XP_MAX_PARTITIONS - 1)) {
+		return xpcInvalidPartid;
+	}
+
+	if (remote_rp->partid == sn_partition_id) {
+		return xpcLocalPartid;
+	}
+
+
+	if (XPC_VERSION_MAJOR(remote_rp->version) !=
+					XPC_VERSION_MAJOR(XPC_RP_VERSION)) {
+		return xpcBadVersion;
+	}
+
+	return xpcSuccess;
+}
+
+
+/*
+ * Get a copy of the remote partition's XPC variables.
+ *
+ * remote_vars points to a buffer that is cacheline aligned for BTE copies and
+ * assumed to be of size XPC_VARS_ALIGNED_SIZE.
+ */
+static enum xpc_retval
+xpc_get_remote_vars(u64 remote_vars_pa, struct xpc_vars *remote_vars)
+{
+	int bres;
+
+
+	if (remote_vars_pa == 0) {
+		return xpcVarsNotSet;
+	}
+
+
+	/* pull over the cross partition variables */
+
+	bres = xp_bte_copy(remote_vars_pa, ia64_tpa((u64) remote_vars),
+				XPC_VARS_ALIGNED_SIZE,
+				(BTE_NOTIFY | BTE_WACQUIRE), NULL);
+	if (bres != BTE_SUCCESS) {
+		return xpc_map_bte_errors(bres);
+	}
+
+	if (XPC_VERSION_MAJOR(remote_vars->version) !=
+					XPC_VERSION_MAJOR(XPC_V_VERSION)) {
+		return xpcBadVersion;
+	}
+
+	return xpcSuccess;
+}
+
+
+/*
+ * Prior code has determine the nasid which generated an IPI.  Inspect
+ * that nasid to determine if its partition needs to be activated or
+ * deactivated.
+ *
+ * A partition is consider "awaiting activation" if our partition
+ * flags indicate it is not active and it has a heartbeat.  A
+ * partition is considered "awaiting deactivation" if our partition
+ * flags indicate it is active but it has no heartbeat or it is not
+ * sending its heartbeat to us.
+ *
+ * To determine the heartbeat, the remote nasid must have a properly
+ * initialized reserved page.
+ */
+static void
+xpc_identify_act_IRQ_req(int nasid)
+{
+	struct xpc_rsvd_page *remote_rp;
+	struct xpc_vars *remote_vars;
+	u64 remote_rsvd_page_pa;
+	u64 remote_vars_pa;
+	partid_t partid;
+	struct xpc_partition *part;
+	enum xpc_retval ret;
+
+
+	/* pull over the reserved page structure */
+
+	remote_rp = (struct xpc_rsvd_page *) xpc_remote_copy_buffer;
+
+	ret = xpc_get_remote_rp(nasid, NULL, remote_rp, &remote_rsvd_page_pa);
+	if (ret != xpcSuccess) {
+		dev_warn(xpc_part, "unable to get reserved page from nasid %d, "
+			"which sent interrupt, reason=%d\n", nasid, ret);
+		return;
+	}
+
+	remote_vars_pa = remote_rp->vars_pa;
+	partid = remote_rp->partid;
+	part = &xpc_partitions[partid];
+
+
+	/* pull over the cross partition variables */
+
+	remote_vars = (struct xpc_vars *) xpc_remote_copy_buffer;
+
+	ret = xpc_get_remote_vars(remote_vars_pa, remote_vars);
+	if (ret != xpcSuccess) {
+
+		dev_warn(xpc_part, "unable to get XPC variables from nasid %d, "
+			"which sent interrupt, reason=%d\n", nasid, ret);
+
+		XPC_DEACTIVATE_PARTITION(part, ret);
+		return;
+	}
+
+
+	part->act_IRQ_rcvd++;
+
+	dev_dbg(xpc_part, "partid for nasid %d is %d; IRQs = %d; HB = "
+		"%ld:0x%lx\n", (int) nasid, (int) partid, part->act_IRQ_rcvd,
+		remote_vars->heartbeat, remote_vars->heartbeating_to_mask);
+
+
+	if (part->act_state == XPC_P_INACTIVE) {
+
+		part->remote_rp_pa = remote_rsvd_page_pa;
+		dev_dbg(xpc_part, "  remote_rp_pa = 0x%016lx\n",
+			part->remote_rp_pa);
+
+		part->remote_vars_pa = remote_vars_pa;
+		dev_dbg(xpc_part, "  remote_vars_pa = 0x%016lx\n",
+			part->remote_vars_pa);
+
+		part->last_heartbeat = remote_vars->heartbeat;
+		dev_dbg(xpc_part, "  last_heartbeat = 0x%016lx\n",
+			part->last_heartbeat);
+
+		part->remote_vars_part_pa = remote_vars->vars_part_pa;
+		dev_dbg(xpc_part, "  remote_vars_part_pa = 0x%016lx\n",
+			part->remote_vars_part_pa);
+
+		part->remote_act_nasid = remote_vars->act_nasid;
+		dev_dbg(xpc_part, "  remote_act_nasid = 0x%x\n",
+			part->remote_act_nasid);
+
+		part->remote_act_phys_cpuid = remote_vars->act_phys_cpuid;
+		dev_dbg(xpc_part, "  remote_act_phys_cpuid = 0x%x\n",
+			part->remote_act_phys_cpuid);
+
+		part->remote_amos_page_pa = remote_vars->amos_page_pa;
+		dev_dbg(xpc_part, "  remote_amos_page_pa = 0x%lx\n",
+			part->remote_amos_page_pa);
+
+		xpc_activate_partition(part);
+
+	} else if (part->remote_amos_page_pa != remote_vars->amos_page_pa ||
+			!XPC_HB_ALLOWED(sn_partition_id, remote_vars)) {
+
+		part->reactivate_nasid = nasid;
+		XPC_DEACTIVATE_PARTITION(part, xpcReactivating);
+	}
+}
+
+
+/*
+ * Loop through the activation AMO variables and process any bits
+ * which are set.  Each bit indicates a nasid sending a partition
+ * activation or deactivation request.
+ *
+ * Return #of IRQs detected.
+ */
+int
+xpc_identify_act_IRQ_sender(void)
+{
+	int word, bit;
+	u64 nasid_mask;
+	u64 nasid;			/* remote nasid */
+	int n_IRQs_detected = 0;
+	AMO_t *act_amos;
+	struct xpc_rsvd_page *rp = (struct xpc_rsvd_page *) xpc_rsvd_page;
+
+
+	act_amos = xpc_vars->act_amos;
+
+
+	/* scan through act AMO variable looking for non-zero entries */
+	for (word = 0; word < XP_NASID_MASK_WORDS; word++) {
+
+		nasid_mask = xpc_IPI_receive(&act_amos[word]);
+		if (nasid_mask == 0) {
+			/* no IRQs from nasids in this variable */
+			continue;
+		}
+
+		dev_dbg(xpc_part, "AMO[%d] gave back 0x%lx\n", word,
+			nasid_mask);
+
+
+		/*
+		 * If this nasid has been added to the machine since
+		 * our partition was reset, this will retain the
+		 * remote nasid in our reserved pages machine mask.
+		 * This is used in the event of module reload.
+		 */
+		rp->mach_nasids[word] |= nasid_mask;
+
+
+		/* locate the nasid(s) which sent interrupts */
+
+		for (bit = 0; bit < (8 * sizeof(u64)); bit++) {
+			if (nasid_mask & (1UL << bit)) {
+				n_IRQs_detected++;
+				nasid = XPC_NASID_FROM_W_B(word, bit);
+				dev_dbg(xpc_part, "interrupt from nasid %ld\n",
+					nasid);
+				xpc_identify_act_IRQ_req(nasid);
+			}
+		}
+	}
+	return n_IRQs_detected;
+}
+
+
+/*
+ * Mark specified partition as active.
+ */
+enum xpc_retval
+xpc_mark_partition_active(struct xpc_partition *part)
+{
+	unsigned long irq_flags;
+	enum xpc_retval ret;
+
+
+	dev_dbg(xpc_part, "setting partition %d to ACTIVE\n", XPC_PARTID(part));
+
+	spin_lock_irqsave(&part->act_lock, irq_flags);
+	if (part->act_state == XPC_P_ACTIVATING) {
+		part->act_state = XPC_P_ACTIVE;
+		ret = xpcSuccess;
+	} else {
+		DBUG_ON(part->reason == xpcSuccess);
+		ret = part->reason;
+	}
+	spin_unlock_irqrestore(&part->act_lock, irq_flags);
+
+	return ret;
+}
+
+
+/*
+ * Notify XPC that the partition is down.
+ */
+void
+xpc_deactivate_partition(const int line, struct xpc_partition *part,
+				enum xpc_retval reason)
+{
+	unsigned long irq_flags;
+	partid_t partid = XPC_PARTID(part);
+
+
+	spin_lock_irqsave(&part->act_lock, irq_flags);
+
+	if (part->act_state == XPC_P_INACTIVE) {
+		XPC_SET_REASON(part, reason, line);
+		spin_unlock_irqrestore(&part->act_lock, irq_flags);
+		if (reason == xpcReactivating) {
+			/* we interrupt ourselves to reactivate partition */
+			xpc_IPI_send_reactivate(part);
+		}
+		return;
+	}
+	if (part->act_state == XPC_P_DEACTIVATING) {
+		if ((part->reason == xpcUnloading && reason != xpcUnloading) ||
+					reason == xpcReactivating) {
+			XPC_SET_REASON(part, reason, line);
+		}
+		spin_unlock_irqrestore(&part->act_lock, irq_flags);
+		return;
+	}
+
+	part->act_state = XPC_P_DEACTIVATING;
+	XPC_SET_REASON(part, reason, line);
+
+	spin_unlock_irqrestore(&part->act_lock, irq_flags);
+
+	XPC_DISALLOW_HB(partid, xpc_vars);
+
+	dev_dbg(xpc_part, "bringing partition %d down, reason = %d\n", partid,
+		reason);
+
+	xpc_partition_down(part, reason);
+}
+
+
+/*
+ * Mark specified partition as active.
+ */
+void
+xpc_mark_partition_inactive(struct xpc_partition *part)
+{
+	unsigned long irq_flags;
+
+
+	dev_dbg(xpc_part, "setting partition %d to INACTIVE\n",
+		XPC_PARTID(part));
+
+	spin_lock_irqsave(&part->act_lock, irq_flags);
+	part->act_state = XPC_P_INACTIVE;
+	spin_unlock_irqrestore(&part->act_lock, irq_flags);
+	part->remote_rp_pa = 0;
+}
+
+
+/*
+ * SAL has provided a partition and machine mask.  The partition mask
+ * contains a bit for each even nasid in our partition.  The machine
+ * mask contains a bit for each even nasid in the entire machine.
+ *
+ * Using those two bit arrays, we can determine which nasids are
+ * known in the machine.  Each should also have a reserved page
+ * initialized if they are available for partitioning.
+ */
+void
+xpc_discovery(void)
+{
+	void *remote_rp_base;
+	struct xpc_rsvd_page *remote_rp;
+	struct xpc_vars *remote_vars;
+	u64 remote_rsvd_page_pa;
+	u64 remote_vars_pa;
+	int region;
+	int max_regions;
+	int nasid;
+	struct xpc_rsvd_page *rp;
+	partid_t partid;
+	struct xpc_partition *part;
+	u64 *discovered_nasids;
+	enum xpc_retval ret;
+
+
+	remote_rp = xpc_kmalloc_cacheline_aligned(XPC_RSVD_PAGE_ALIGNED_SIZE,
+						GFP_KERNEL, &remote_rp_base);
+	if (remote_rp == NULL) {
+		return;
+	}
+	remote_vars = (struct xpc_vars *) remote_rp;
+
+
+	discovered_nasids = kmalloc(sizeof(u64) * XP_NASID_MASK_WORDS,
+							GFP_KERNEL);
+	if (discovered_nasids == NULL) {
+		kfree(remote_rp_base);
+		return;
+	}
+	memset(discovered_nasids, 0, sizeof(u64) * XP_NASID_MASK_WORDS);
+
+	rp = (struct xpc_rsvd_page *) xpc_rsvd_page;
+
+	/*
+	 * The term 'region' in this context refers to the minimum number of
+	 * nodes that can comprise an access protection grouping. The access
+	 * protection is in regards to memory, IOI and IPI.
+	 */
+//>>> move the next two #defines into either include/asm-ia64/sn/arch.h or
+//>>> include/asm-ia64/sn/addrs.h
+#define SH1_MAX_REGIONS		64
+#define SH2_MAX_REGIONS		256
+	max_regions = is_shub2() ? SH2_MAX_REGIONS : SH1_MAX_REGIONS;
+
+	for (region = 0; region < max_regions; region++) {
+
+		if ((volatile int) xpc_exiting) {
+			break;
+		}
+
+		dev_dbg(xpc_part, "searching region %d\n", region);
+
+		for (nasid = (region * sn_region_size * 2);
+		     nasid < ((region + 1) * sn_region_size * 2);
+		     nasid += 2) {
+
+			if ((volatile int) xpc_exiting) {
+				break;
+			}
+
+			dev_dbg(xpc_part, "checking nasid %d\n", nasid);
+
+
+			if (XPC_NASID_IN_ARRAY(nasid, rp->part_nasids)) {
+				dev_dbg(xpc_part, "PROM indicates Nasid %d is "
+					"part of the local partition; skipping "
+					"region\n", nasid);
+				break;
+			}
+
+			if (!(XPC_NASID_IN_ARRAY(nasid, rp->mach_nasids))) {
+				dev_dbg(xpc_part, "PROM indicates Nasid %d was "
+					"not on Numa-Link network at reset\n",
+					nasid);
+				continue;
+			}
+
+			if (XPC_NASID_IN_ARRAY(nasid, discovered_nasids)) {
+				dev_dbg(xpc_part, "Nasid %d is part of a "
+					"partition which was previously "
+					"discovered\n", nasid);
+				continue;
+			}
+
+
+			/* pull over the reserved page structure */
+
+			ret = xpc_get_remote_rp(nasid, discovered_nasids,
+					      remote_rp, &remote_rsvd_page_pa);
+			if (ret != xpcSuccess) {
+				dev_dbg(xpc_part, "unable to get reserved page "
+					"from nasid %d, reason=%d\n", nasid,
+					ret);
+
+				if (ret == xpcLocalPartid) {
+					break;
+				}
+				continue;
+			}
+
+			remote_vars_pa = remote_rp->vars_pa;
+
+			partid = remote_rp->partid;
+			part = &xpc_partitions[partid];
+
+
+			/* pull over the cross partition variables */
+
+			ret = xpc_get_remote_vars(remote_vars_pa, remote_vars);
+			if (ret != xpcSuccess) {
+				dev_dbg(xpc_part, "unable to get XPC variables "
+					"from nasid %d, reason=%d\n", nasid,
+					ret);
+
+				XPC_DEACTIVATE_PARTITION(part, ret);
+				continue;
+			}
+
+			if (part->act_state != XPC_P_INACTIVE) {
+				dev_dbg(xpc_part, "partition %d on nasid %d is "
+					"already activating\n", partid, nasid);
+				break;
+			}
+
+			/*
+			 * Register the remote partition's AMOs with SAL so it
+			 * can handle and cleanup errors within that address
+			 * range should the remote partition go down. We don't
+			 * unregister this range because it is difficult to
+			 * tell when outstanding writes to the remote partition
+			 * are finished and thus when it is thus safe to
+			 * unregister. This should not result in wasted space
+			 * in the SAL xp_addr_region table because we should
+			 * get the same page for remote_act_amos_pa after
+			 * module reloads and system reboots.
+			 */
+			if (sn_register_xp_addr_region(
+					    remote_vars->amos_page_pa,
+							PAGE_SIZE, 1) < 0) {
+				dev_dbg(xpc_part, "partition %d failed to "
+					"register xp_addr region 0x%016lx\n",
+					partid, remote_vars->amos_page_pa);
+
+				XPC_SET_REASON(part, xpcPhysAddrRegFailed,
+						__LINE__);
+				break;
+			}
+
+			/*
+			 * The remote nasid is valid and available.
+			 * Send an interrupt to that nasid to notify
+			 * it that we are ready to begin activation.
+			 */
+			dev_dbg(xpc_part, "sending an interrupt to AMO 0x%lx, "
+				"nasid %d, phys_cpuid 0x%x\n",
+				remote_vars->amos_page_pa,
+				remote_vars->act_nasid,
+				remote_vars->act_phys_cpuid);
+
+			xpc_IPI_send_activate(remote_vars);
+		}
+	}
+
+	kfree(discovered_nasids);
+	kfree(remote_rp_base);
+}
+
+
+/*
+ * Given a partid, get the nasids owned by that partition from the
+ * remote partition's reserved page.
+ */
+enum xpc_retval
+xpc_initiate_partid_to_nasids(partid_t partid, void *nasid_mask)
+{
+	struct xpc_partition *part;
+	u64 part_nasid_pa;
+	int bte_res;
+
+
+	part = &xpc_partitions[partid];
+	if (part->remote_rp_pa == 0) {
+		return xpcPartitionDown;
+	}
+
+	part_nasid_pa = part->remote_rp_pa +
+		(u64) &((struct xpc_rsvd_page *) 0)->part_nasids;
+
+	bte_res = xp_bte_copy(part_nasid_pa, ia64_tpa((u64) nasid_mask),
+				L1_CACHE_ALIGN(XP_NASID_MASK_BYTES),
+				(BTE_NOTIFY | BTE_WACQUIRE), NULL);
+
+	return xpc_map_bte_errors(bte_res);
+}
+

arch/ia64/sn/kernel/xpnet.c

@@ -0,0 +1,715 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1999,2001-2005 Silicon Graphics, Inc. All rights reserved.
+ */
+
+
+/*
+ * Cross Partition Network Interface (XPNET) support
+ *
+ *	XPNET provides a virtual network layered on top of the Cross
+ *	Partition communication layer.
+ *
+ *	XPNET provides direct point-to-point and broadcast-like support
+ *	for an ethernet-like device.  The ethernet broadcast medium is
+ *	replaced with a point-to-point message structure which passes
+ *	pointers to a DMA-capable block that a remote partition should
+ *	retrieve and pass to the upper level networking layer.
+ *
+ */
+
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/delay.h>
+#include <linux/ethtool.h>
+#include <linux/mii.h>
+#include <linux/smp.h>
+#include <linux/string.h>
+#include <asm/sn/bte.h>
+#include <asm/sn/io.h>
+#include <asm/sn/sn_sal.h>
+#include <asm/types.h>
+#include <asm/atomic.h>
+#include <asm/sn/xp.h>
+
+
+/*
+ * The message payload transferred by XPC.
+ *
+ * buf_pa is the physical address where the DMA should pull from.
+ *
+ * NOTE: for performance reasons, buf_pa should _ALWAYS_ begin on a
+ * cacheline boundary.  To accomplish this, we record the number of
+ * bytes from the beginning of the first cacheline to the first useful
+ * byte of the skb (leadin_ignore) and the number of bytes from the
+ * last useful byte of the skb to the end of the last cacheline
+ * (tailout_ignore).
+ *
+ * size is the number of bytes to transfer which includes the skb->len
+ * (useful bytes of the senders skb) plus the leadin and tailout
+ */
+struct xpnet_message {
+	u16 version;		/* Version for this message */
+	u16 embedded_bytes;	/* #of bytes embedded in XPC message */
+	u32 magic;		/* Special number indicating this is xpnet */
+	u64 buf_pa;		/* phys address of buffer to retrieve */
+	u32 size;		/* #of bytes in buffer */
+	u8 leadin_ignore;	/* #of bytes to ignore at the beginning */
+	u8 tailout_ignore;	/* #of bytes to ignore at the end */
+	unsigned char data;	/* body of small packets */
+};
+
+/*
+ * Determine the size of our message, the cacheline aligned size,
+ * and then the number of message will request from XPC.
+ *
+ * XPC expects each message to exist in an individual cacheline.
+ */
+#define XPNET_MSG_SIZE		(L1_CACHE_BYTES - XPC_MSG_PAYLOAD_OFFSET)
+#define XPNET_MSG_DATA_MAX	\
+		(XPNET_MSG_SIZE - (u64)(&((struct xpnet_message *)0)->data))
+#define XPNET_MSG_ALIGNED_SIZE	(L1_CACHE_ALIGN(XPNET_MSG_SIZE))
+#define XPNET_MSG_NENTRIES	(PAGE_SIZE / XPNET_MSG_ALIGNED_SIZE)
+
+
+#define XPNET_MAX_KTHREADS	(XPNET_MSG_NENTRIES + 1)
+#define XPNET_MAX_IDLE_KTHREADS	(XPNET_MSG_NENTRIES + 1)
+
+/*
+ * Version number of XPNET implementation. XPNET can always talk to versions
+ * with same major #, and never talk to versions with a different version.
+ */
+#define _XPNET_VERSION(_major, _minor)	(((_major) << 4) | (_minor))
+#define XPNET_VERSION_MAJOR(_v)		((_v) >> 4)
+#define XPNET_VERSION_MINOR(_v)		((_v) & 0xf)
+
+#define	XPNET_VERSION _XPNET_VERSION(1,0)		/* version 1.0 */
+#define	XPNET_VERSION_EMBED _XPNET_VERSION(1,1)		/* version 1.1 */
+#define XPNET_MAGIC	0x88786984 /* "XNET" */
+
+#define XPNET_VALID_MSG(_m)						     \
+   ((XPNET_VERSION_MAJOR(_m->version) == XPNET_VERSION_MAJOR(XPNET_VERSION)) \
+    && (msg->magic == XPNET_MAGIC))
+
+#define XPNET_DEVICE_NAME		"xp0"
+
+
+/*
+ * When messages are queued with xpc_send_notify, a kmalloc'd buffer
+ * of the following type is passed as a notification cookie.  When the
+ * notification function is called, we use the cookie to decide
+ * whether all outstanding message sends have completed.  The skb can
+ * then be released.
+ */
+struct xpnet_pending_msg {
+	struct list_head free_list;
+	struct sk_buff *skb;
+	atomic_t use_count;
+};
+
+/* driver specific structure pointed to by the device structure */
+struct xpnet_dev_private {
+	struct net_device_stats stats;
+};
+
+struct net_device *xpnet_device;
+
+/*
+ * When we are notified of other partitions activating, we add them to
+ * our bitmask of partitions to which we broadcast.
+ */
+static u64 xpnet_broadcast_partitions;
+/* protect above */
+static spinlock_t xpnet_broadcast_lock = SPIN_LOCK_UNLOCKED;
+
+/*
+ * Since the Block Transfer Engine (BTE) is being used for the transfer
+ * and it relies upon cache-line size transfers, we need to reserve at
+ * least one cache-line for head and tail alignment.  The BTE is
+ * limited to 8MB transfers.
+ *
+ * Testing has shown that changing MTU to greater than 64KB has no effect
+ * on TCP as the two sides negotiate a Max Segment Size that is limited
+ * to 64K.  Other protocols May use packets greater than this, but for
+ * now, the default is 64KB.
+ */
+#define XPNET_MAX_MTU (0x800000UL - L1_CACHE_BYTES)
+/* 32KB has been determined to be the ideal */
+#define XPNET_DEF_MTU (0x8000UL)
+
+
+/*
+ * The partition id is encapsulated in the MAC address.  The following
+ * define locates the octet the partid is in.
+ */
+#define XPNET_PARTID_OCTET	1
+#define XPNET_LICENSE_OCTET	2
+
+
+/*
+ * Define the XPNET debug device structure that is to be used with dev_dbg(),
+ * dev_err(), dev_warn(), and dev_info().
+ */
+struct device_driver xpnet_dbg_name = {
+	.name = "xpnet"
+};
+
+struct device xpnet_dbg_subname = {
+	.bus_id = {0},			/* set to "" */
+	.driver = &xpnet_dbg_name
+};
+
+struct device *xpnet = &xpnet_dbg_subname;
+
+/*
+ * Packet was recevied by XPC and forwarded to us.
+ */
+static void
+xpnet_receive(partid_t partid, int channel, struct xpnet_message *msg)
+{
+	struct sk_buff *skb;
+	bte_result_t bret;
+	struct xpnet_dev_private *priv =
+		(struct xpnet_dev_private *) xpnet_device->priv;
+
+
+	if (!XPNET_VALID_MSG(msg)) {
+		/*
+		 * Packet with a different XPC version.  Ignore.
+		 */
+		xpc_received(partid, channel, (void *) msg);
+
+		priv->stats.rx_errors++;
+
+		return;
+	}
+	dev_dbg(xpnet, "received 0x%lx, %d, %d, %d\n", msg->buf_pa, msg->size,
+		msg->leadin_ignore, msg->tailout_ignore);
+
+
+	/* reserve an extra cache line */
+	skb = dev_alloc_skb(msg->size + L1_CACHE_BYTES);
+	if (!skb) {
+		dev_err(xpnet, "failed on dev_alloc_skb(%d)\n",
+			msg->size + L1_CACHE_BYTES);
+
+		xpc_received(partid, channel, (void *) msg);
+
+		priv->stats.rx_errors++;
+
+		return;
+	}
+
+	/*
+	 * The allocated skb has some reserved space.
+	 * In order to use bte_copy, we need to get the
+	 * skb->data pointer moved forward.
+	 */
+	skb_reserve(skb, (L1_CACHE_BYTES - ((u64)skb->data &
+					    (L1_CACHE_BYTES - 1)) +
+			  msg->leadin_ignore));
+
+	/*
+	 * Update the tail pointer to indicate data actually
+	 * transferred.
+	 */
+	skb_put(skb, (msg->size - msg->leadin_ignore - msg->tailout_ignore));
+
+	/*
+	 * Move the data over from the the other side.
+	 */
+	if ((XPNET_VERSION_MINOR(msg->version) == 1) &&
+						(msg->embedded_bytes != 0)) {
+		dev_dbg(xpnet, "copying embedded message. memcpy(0x%p, 0x%p, "
+			"%lu)\n", skb->data, &msg->data,
+			(size_t) msg->embedded_bytes);
+
+		memcpy(skb->data, &msg->data, (size_t) msg->embedded_bytes);
+	} else {
+		dev_dbg(xpnet, "transferring buffer to the skb->data area;\n\t"
+			"bte_copy(0x%p, 0x%p, %hu)\n", (void *)msg->buf_pa,
+			(void *)__pa((u64)skb->data & ~(L1_CACHE_BYTES - 1)),
+			msg->size);
+
+		bret = bte_copy(msg->buf_pa,
+				__pa((u64)skb->data & ~(L1_CACHE_BYTES - 1)),
+				msg->size, (BTE_NOTIFY | BTE_WACQUIRE), NULL);
+
+		if (bret != BTE_SUCCESS) {
+			// >>> Need better way of cleaning skb.  Currently skb
+			// >>> appears in_use and we can't just call
+			// >>> dev_kfree_skb.
+			dev_err(xpnet, "bte_copy(0x%p, 0x%p, 0x%hx) returned "
+				"error=0x%x\n", (void *)msg->buf_pa,
+				(void *)__pa((u64)skb->data &
+							~(L1_CACHE_BYTES - 1)),
+				msg->size, bret);
+
+			xpc_received(partid, channel, (void *) msg);
+
+			priv->stats.rx_errors++;
+
+			return;
+		}
+	}
+
+	dev_dbg(xpnet, "<skb->head=0x%p skb->data=0x%p skb->tail=0x%p "
+		"skb->end=0x%p skb->len=%d\n", (void *) skb->head,
+		(void *) skb->data, (void *) skb->tail, (void *) skb->end,
+		skb->len);
+
+	skb->dev = xpnet_device;
+	skb->protocol = eth_type_trans(skb, xpnet_device);
+	skb->ip_summed = CHECKSUM_UNNECESSARY;
+
+	dev_dbg(xpnet, "passing skb to network layer; \n\tskb->head=0x%p "
+		"skb->data=0x%p skb->tail=0x%p skb->end=0x%p skb->len=%d\n",
+		(void *) skb->head, (void *) skb->data, (void *) skb->tail,
+		(void *) skb->end, skb->len);
+
+
+	xpnet_device->last_rx = jiffies;
+	priv->stats.rx_packets++;
+	priv->stats.rx_bytes += skb->len + ETH_HLEN;
+
+	netif_rx_ni(skb);
+	xpc_received(partid, channel, (void *) msg);
+}
+
+
+/*
+ * This is the handler which XPC calls during any sort of change in
+ * state or message reception on a connection.
+ */
+static void
+xpnet_connection_activity(enum xpc_retval reason, partid_t partid, int channel,
+			  void *data, void *key)
+{
+	long bp;
+
+
+	DBUG_ON(partid <= 0 || partid >= XP_MAX_PARTITIONS);
+	DBUG_ON(channel != XPC_NET_CHANNEL);
+
+	switch(reason) {
+	case xpcMsgReceived:	/* message received */
+		DBUG_ON(data == NULL);
+
+		xpnet_receive(partid, channel, (struct xpnet_message *) data);
+		break;
+
+	case xpcConnected:	/* connection completed to a partition */
+		spin_lock_bh(&xpnet_broadcast_lock);
+		xpnet_broadcast_partitions |= 1UL << (partid -1 );
+		bp = xpnet_broadcast_partitions;
+		spin_unlock_bh(&xpnet_broadcast_lock);
+
+		netif_carrier_on(xpnet_device);
+
+		dev_dbg(xpnet, "%s connection created to partition %d; "
+			"xpnet_broadcast_partitions=0x%lx\n",
+			xpnet_device->name, partid, bp);
+		break;
+
+	default:
+		spin_lock_bh(&xpnet_broadcast_lock);
+		xpnet_broadcast_partitions &= ~(1UL << (partid -1 ));
+		bp = xpnet_broadcast_partitions;
+		spin_unlock_bh(&xpnet_broadcast_lock);
+
+		if (bp == 0) {
+			netif_carrier_off(xpnet_device);
+		}
+
+		dev_dbg(xpnet, "%s disconnected from partition %d; "
+			"xpnet_broadcast_partitions=0x%lx\n",
+			xpnet_device->name, partid, bp);
+		break;
+
+	}
+}
+
+
+static int
+xpnet_dev_open(struct net_device *dev)
+{
+	enum xpc_retval ret;
+
+
+	dev_dbg(xpnet, "calling xpc_connect(%d, 0x%p, NULL, %ld, %ld, %d, "
+		"%d)\n", XPC_NET_CHANNEL, xpnet_connection_activity,
+		XPNET_MSG_SIZE, XPNET_MSG_NENTRIES, XPNET_MAX_KTHREADS,
+		XPNET_MAX_IDLE_KTHREADS);
+
+	ret = xpc_connect(XPC_NET_CHANNEL, xpnet_connection_activity, NULL,
+			  XPNET_MSG_SIZE, XPNET_MSG_NENTRIES,
+			  XPNET_MAX_KTHREADS, XPNET_MAX_IDLE_KTHREADS);
+	if (ret != xpcSuccess) {
+		dev_err(xpnet, "ifconfig up of %s failed on XPC connect, "
+			"ret=%d\n", dev->name, ret);
+
+		return -ENOMEM;
+	}
+
+	dev_dbg(xpnet, "ifconfig up of %s; XPC connected\n", dev->name);
+
+	return 0;
+}
+
+
+static int
+xpnet_dev_stop(struct net_device *dev)
+{
+	xpc_disconnect(XPC_NET_CHANNEL);
+
+	dev_dbg(xpnet, "ifconfig down of %s; XPC disconnected\n", dev->name);
+
+	return 0;
+}
+
+
+static int
+xpnet_dev_change_mtu(struct net_device *dev, int new_mtu)
+{
+	/* 68 comes from min TCP+IP+MAC header */
+	if ((new_mtu < 68) || (new_mtu > XPNET_MAX_MTU)) {
+		dev_err(xpnet, "ifconfig %s mtu %d failed; value must be "
+			"between 68 and %ld\n", dev->name, new_mtu,
+			XPNET_MAX_MTU);
+		return -EINVAL;
+	}
+
+	dev->mtu = new_mtu;
+	dev_dbg(xpnet, "ifconfig %s mtu set to %d\n", dev->name, new_mtu);
+	return 0;
+}
+
+
+/*
+ * Required for the net_device structure.
+ */
+static int
+xpnet_dev_set_config(struct net_device *dev, struct ifmap *new_map)
+{
+	return 0;
+}
+
+
+/*
+ * Return statistics to the caller.
+ */
+static struct net_device_stats *
+xpnet_dev_get_stats(struct net_device *dev)
+{
+	struct xpnet_dev_private *priv;
+
+
+	priv = (struct xpnet_dev_private *) dev->priv;
+
+	return &priv->stats;
+}
+
+
+/*
+ * Notification that the other end has received the message and
+ * DMA'd the skb information.  At this point, they are done with
+ * our side.  When all recipients are done processing, we
+ * release the skb and then release our pending message structure.
+ */
+static void
+xpnet_send_completed(enum xpc_retval reason, partid_t partid, int channel,
+			void *__qm)
+{
+	struct xpnet_pending_msg *queued_msg =
+		(struct xpnet_pending_msg *) __qm;
+
+
+	DBUG_ON(queued_msg == NULL);
+
+	dev_dbg(xpnet, "message to %d notified with reason %d\n",
+		partid, reason);
+
+	if (atomic_dec_return(&queued_msg->use_count) == 0) {
+		dev_dbg(xpnet, "all acks for skb->head=-x%p\n",
+			(void *) queued_msg->skb->head);
+
+		dev_kfree_skb_any(queued_msg->skb);
+		kfree(queued_msg);
+	}
+}
+
+
+/*
+ * Network layer has formatted a packet (skb) and is ready to place it
+ * "on the wire".  Prepare and send an xpnet_message to all partitions
+ * which have connected with us and are targets of this packet.
+ *
+ * MAC-NOTE:  For the XPNET driver, the MAC address contains the
+ * destination partition_id.  If the destination partition id word
+ * is 0xff, this packet is to broadcast to all partitions.
+ */
+static int
+xpnet_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct xpnet_pending_msg *queued_msg;
+	enum xpc_retval ret;
+	struct xpnet_message *msg;
+	u64 start_addr, end_addr;
+	long dp;
+	u8 second_mac_octet;
+	partid_t dest_partid;
+	struct xpnet_dev_private *priv;
+	u16 embedded_bytes;
+
+
+	priv = (struct xpnet_dev_private *) dev->priv;
+
+
+	dev_dbg(xpnet, ">skb->head=0x%p skb->data=0x%p skb->tail=0x%p "
+		"skb->end=0x%p skb->len=%d\n", (void *) skb->head,
+		(void *) skb->data, (void *) skb->tail, (void *) skb->end,
+		skb->len);
+
+
+	/*
+	 * The xpnet_pending_msg tracks how many outstanding
+	 * xpc_send_notifies are relying on this skb.  When none
+	 * remain, release the skb.
+	 */
+	queued_msg = kmalloc(sizeof(struct xpnet_pending_msg), GFP_ATOMIC);
+	if (queued_msg == NULL) {
+		dev_warn(xpnet, "failed to kmalloc %ld bytes; dropping "
+			"packet\n", sizeof(struct xpnet_pending_msg));
+
+		priv->stats.tx_errors++;
+
+		return -ENOMEM;
+	}
+
+
+	/* get the beginning of the first cacheline and end of last */
+	start_addr = ((u64) skb->data & ~(L1_CACHE_BYTES - 1));
+	end_addr = L1_CACHE_ALIGN((u64) skb->tail);
+
+	/* calculate how many bytes to embed in the XPC message */
+	embedded_bytes = 0;
+	if (unlikely(skb->len <= XPNET_MSG_DATA_MAX)) {
+		/* skb->data does fit so embed */
+		embedded_bytes = skb->len;
+	}
+
+
+	/*
+	 * Since the send occurs asynchronously, we set the count to one
+	 * and begin sending.  Any sends that happen to complete before
+	 * we are done sending will not free the skb.  We will be left
+	 * with that task during exit.  This also handles the case of
+	 * a packet destined for a partition which is no longer up.
+	 */
+	atomic_set(&queued_msg->use_count, 1);
+	queued_msg->skb = skb;
+
+
+	second_mac_octet = skb->data[XPNET_PARTID_OCTET];
+	if (second_mac_octet == 0xff) {
+		/* we are being asked to broadcast to all partitions */
+		dp = xpnet_broadcast_partitions;
+	} else if (second_mac_octet != 0) {
+		dp = xpnet_broadcast_partitions &
+					(1UL << (second_mac_octet - 1));
+	} else {
+		/* 0 is an invalid partid.  Ignore */
+		dp = 0;
+	}
+	dev_dbg(xpnet, "destination Partitions mask (dp) = 0x%lx\n", dp);
+
+	/*
+	 * If we wanted to allow promiscous mode to work like an
+	 * unswitched network, this would be a good point to OR in a
+	 * mask of partitions which should be receiving all packets.
+	 */
+
+	/*
+	 * Main send loop.
+	 */
+	for (dest_partid = 1; dp && dest_partid < XP_MAX_PARTITIONS;
+	     dest_partid++) {
+
+
+		if (!(dp & (1UL << (dest_partid - 1)))) {
+			/* not destined for this partition */
+			continue;
+		}
+
+		/* remove this partition from the destinations mask */
+		dp &= ~(1UL << (dest_partid - 1));
+
+
+		/* found a partition to send to */
+
+		ret = xpc_allocate(dest_partid, XPC_NET_CHANNEL,
+				   XPC_NOWAIT, (void **)&msg);
+		if (unlikely(ret != xpcSuccess)) {
+			continue;
+		}
+
+		msg->embedded_bytes = embedded_bytes;
+		if (unlikely(embedded_bytes != 0)) {
+			msg->version = XPNET_VERSION_EMBED;
+			dev_dbg(xpnet, "calling memcpy(0x%p, 0x%p, 0x%lx)\n",
+				&msg->data, skb->data, (size_t) embedded_bytes);
+			memcpy(&msg->data, skb->data, (size_t) embedded_bytes);
+		} else {
+			msg->version = XPNET_VERSION;
+		}
+		msg->magic = XPNET_MAGIC;
+		msg->size = end_addr - start_addr;
+		msg->leadin_ignore = (u64) skb->data - start_addr;
+		msg->tailout_ignore = end_addr - (u64) skb->tail;
+		msg->buf_pa = __pa(start_addr);
+
+		dev_dbg(xpnet, "sending XPC message to %d:%d\nmsg->buf_pa="
+			"0x%lx, msg->size=%u, msg->leadin_ignore=%u, "
+			"msg->tailout_ignore=%u\n", dest_partid,
+			XPC_NET_CHANNEL, msg->buf_pa, msg->size,
+			msg->leadin_ignore, msg->tailout_ignore);
+
+
+		atomic_inc(&queued_msg->use_count);
+
+		ret = xpc_send_notify(dest_partid, XPC_NET_CHANNEL, msg,
+				      xpnet_send_completed, queued_msg);
+		if (unlikely(ret != xpcSuccess)) {
+			atomic_dec(&queued_msg->use_count);
+			continue;
+		}
+
+	}
+
+	if (atomic_dec_return(&queued_msg->use_count) == 0) {
+		dev_dbg(xpnet, "no partitions to receive packet destined for "
+			"%d\n", dest_partid);
+
+
+		dev_kfree_skb(skb);
+		kfree(queued_msg);
+	}
+
+	priv->stats.tx_packets++;
+	priv->stats.tx_bytes += skb->len;
+
+	return 0;
+}
+
+
+/*
+ * Deal with transmit timeouts coming from the network layer.
+ */
+static void
+xpnet_dev_tx_timeout (struct net_device *dev)
+{
+	struct xpnet_dev_private *priv;
+
+
+	priv = (struct xpnet_dev_private *) dev->priv;
+
+	priv->stats.tx_errors++;
+	return;
+}
+
+
+static int __init
+xpnet_init(void)
+{
+	int i;
+	u32 license_num;
+	int result = -ENOMEM;
+
+
+	dev_info(xpnet, "registering network device %s\n", XPNET_DEVICE_NAME);
+
+	/*
+	 * use ether_setup() to init the majority of our device
+	 * structure and then override the necessary pieces.
+	 */
+	xpnet_device = alloc_netdev(sizeof(struct xpnet_dev_private),
+				    XPNET_DEVICE_NAME, ether_setup);
+	if (xpnet_device == NULL) {
+		return -ENOMEM;
+	}
+
+	netif_carrier_off(xpnet_device);
+
+	xpnet_device->mtu = XPNET_DEF_MTU;
+	xpnet_device->change_mtu = xpnet_dev_change_mtu;
+	xpnet_device->open = xpnet_dev_open;
+	xpnet_device->get_stats = xpnet_dev_get_stats;
+	xpnet_device->stop = xpnet_dev_stop;
+	xpnet_device->hard_start_xmit = xpnet_dev_hard_start_xmit;
+	xpnet_device->tx_timeout = xpnet_dev_tx_timeout;
+	xpnet_device->set_config = xpnet_dev_set_config;
+
+	/*
+	 * Multicast assumes the LSB of the first octet is set for multicast
+	 * MAC addresses.  We chose the first octet of the MAC to be unlikely
+	 * to collide with any vendor's officially issued MAC.
+	 */
+	xpnet_device->dev_addr[0] = 0xfe;
+	xpnet_device->dev_addr[XPNET_PARTID_OCTET] = sn_partition_id;
+	license_num = sn_partition_serial_number_val();
+	for (i = 3; i >= 0; i--) {
+		xpnet_device->dev_addr[XPNET_LICENSE_OCTET + i] =
+							license_num & 0xff;
+		license_num = license_num >> 8;
+	}
+
+	/*
+	 * ether_setup() sets this to a multicast device.  We are
+	 * really not supporting multicast at this time.
+	 */
+	xpnet_device->flags &= ~IFF_MULTICAST;
+
+	/*
+	 * No need to checksum as it is a DMA transfer.  The BTE will
+	 * report an error if the data is not retrievable and the
+	 * packet will be dropped.
+	 */
+	xpnet_device->features = NETIF_F_NO_CSUM;
+
+	result = register_netdev(xpnet_device);
+	if (result != 0) {
+		free_netdev(xpnet_device);
+	}
+
+	return result;
+}
+module_init(xpnet_init);
+
+
+static void __exit
+xpnet_exit(void)
+{
+	dev_info(xpnet, "unregistering network device %s\n",
+		xpnet_device[0].name);
+
+	unregister_netdev(xpnet_device);
+
+	free_netdev(xpnet_device);
+}
+module_exit(xpnet_exit);
+
+
+MODULE_AUTHOR("Silicon Graphics, Inc.");
+MODULE_DESCRIPTION("Cross Partition Network adapter (XPNET)");
+MODULE_LICENSE("GPL");
+

arch/ia64/sn/pci/pcibr/pcibr_dma.c

@@ -301,7 +301,7 @@ void sn_dma_flush(uint64_t addr)
 		spin_lock_irqsave(&((struct sn_flush_device_list *)p)->
 				  sfdl_flush_lock, flags);
 
-		p->sfdl_flush_value = 0;
+		*p->sfdl_flush_addr = 0;
 
 		/* force an interrupt. */
 		*(volatile uint32_t *)(p->sfdl_force_int_addr) = 1;

arch/ia64/sn/pci/tioca_provider.c

@@ -431,7 +431,7 @@ tioca_dma_mapped(struct pci_dev *pdev, uint64_t paddr, size_t req_size)
 	ca_dmamap->cad_dma_addr = bus_addr;
 	ca_dmamap->cad_gart_size = entries;
 	ca_dmamap->cad_gart_entry = entry;
-	list_add(&ca_dmamap->cad_list, &tioca_kern->ca_list);
+	list_add(&ca_dmamap->cad_list, &tioca_kern->ca_dmamaps);
 
 	if (xio_addr % ps) {
 		tioca_kern->ca_pcigart[entry] = tioca_paddr_to_gart(xio_addr);

arch/m68knommu/Kconfig

@@ -534,6 +534,11 @@ endchoice
 
 endmenu
 
+config ISA_DMA_API
+	bool
+	depends on !M5272
+	default y
+
 menu "Bus options (PCI, PCMCIA, EISA, MCA, ISA)"
 
 config PCI

arch/mips/Kconfig

@@ -1656,3 +1656,7 @@ config GENERIC_HARDIRQS
 config GENERIC_IRQ_PROBE
 	bool
 	default y
+
+config ISA_DMA_API
+	bool
+	default y

arch/parisc/Kconfig

@@ -45,6 +45,10 @@ config GENERIC_IRQ_PROBE
 config PM
 	bool
 
+config ISA_DMA_API
+	bool
+	default y
+
 source "init/Kconfig"
 
 

arch/ppc/Kconfig

@@ -1079,6 +1079,10 @@ source kernel/power/Kconfig
 
 endmenu
 
+config ISA_DMA_API
+	bool
+	default y
+
 menu "Bus options"
 
 config ISA

arch/ppc64/Kconfig

@@ -293,6 +293,9 @@ config SECCOMP
 
 endmenu
 
+config ISA_DMA_API
+	bool
+	default y
 
 menu "General setup"
 

arch/ppc64/Makefile

@@ -56,12 +56,19 @@ LDFLAGS_vmlinux	:= -Bstatic -e $(KERNELLOAD) -Ttext $(KERNELLOAD)
 CFLAGS		+= -msoft-float -pipe -mminimal-toc -mtraceback=none \
 		   -mcall-aixdesc
 
+GCC_VERSION     := $(call cc-version)
+GCC_BROKEN_VEC	:= $(shell if [ $(GCC_VERSION) -lt 0400 ] ; then echo "y"; fi ;)
+
 ifeq ($(CONFIG_POWER4_ONLY),y)
 ifeq ($(CONFIG_ALTIVEC),y)
+ifeq ($(GCC_BROKEN_VEC),y)
 	CFLAGS += $(call cc-option,-mcpu=970)
 else
 	CFLAGS += $(call cc-option,-mcpu=power4)
 endif
+else
+	CFLAGS += $(call cc-option,-mcpu=power4)
+endif
 else
 	CFLAGS += $(call cc-option,-mtune=power4)
 endif

arch/sh/Kconfig

@@ -693,6 +693,10 @@ config RTC_9701JE
 
 endmenu
 
+config ISA_DMA_API
+	bool
+	depends on MPC1211
+	default y
 
 menu "Bus options (PCI, PCMCIA, EISA, MCA, ISA)"
 

arch/sparc/prom/memory.c

@@ -47,9 +47,9 @@ prom_sortmemlist(struct linux_mlist_v0 *thislist)
 	char *tmpaddr;
 	char *lowest;
 
-	for(i=0; thislist[i].theres_more != 0; i++) {
+	for(i=0; thislist[i].theres_more; i++) {
 		lowest = thislist[i].start_adr;
-		for(mitr = i+1; thislist[mitr-1].theres_more != 0; mitr++)
+		for(mitr = i+1; thislist[mitr-1].theres_more; mitr++)
 			if(thislist[mitr].start_adr < lowest) {
 				lowest = thislist[mitr].start_adr;
 				swapi = mitr;
@@ -85,7 +85,7 @@ void __init prom_meminit(void)
 			prom_phys_total[iter].num_bytes = mptr->num_bytes;
 			prom_phys_total[iter].theres_more = &prom_phys_total[iter+1];
 		}
-		prom_phys_total[iter-1].theres_more = 0x0;
+		prom_phys_total[iter-1].theres_more = NULL;
 		/* Second, the total prom taken descriptors. */
 		for(mptr = (*(romvec->pv_v0mem.v0_prommap)), iter=0;
 		    mptr; mptr=mptr->theres_more, iter++) {
@@ -93,7 +93,7 @@ void __init prom_meminit(void)
 			prom_prom_taken[iter].num_bytes = mptr->num_bytes;
 			prom_prom_taken[iter].theres_more = &prom_prom_taken[iter+1];
 		}
-		prom_prom_taken[iter-1].theres_more = 0x0;
+		prom_prom_taken[iter-1].theres_more = NULL;
 		/* Last, the available physical descriptors. */
 		for(mptr = (*(romvec->pv_v0mem.v0_available)), iter=0;
 		    mptr; mptr=mptr->theres_more, iter++) {
@@ -101,7 +101,7 @@ void __init prom_meminit(void)
 			prom_phys_avail[iter].num_bytes = mptr->num_bytes;
 			prom_phys_avail[iter].theres_more = &prom_phys_avail[iter+1];
 		}
-		prom_phys_avail[iter-1].theres_more = 0x0;
+		prom_phys_avail[iter-1].theres_more = NULL;
 		/* Sort all the lists. */
 		prom_sortmemlist(prom_phys_total);
 		prom_sortmemlist(prom_prom_taken);
@@ -124,7 +124,7 @@ void __init prom_meminit(void)
 			prom_phys_avail[iter].theres_more =
 				&prom_phys_avail[iter+1];
 		}
-		prom_phys_avail[iter-1].theres_more = 0x0;
+		prom_phys_avail[iter-1].theres_more = NULL;
 
 		num_regs = prom_getproperty(node, "reg",
 					    (char *) prom_reg_memlist,
@@ -138,7 +138,7 @@ void __init prom_meminit(void)
 			prom_phys_total[iter].theres_more =
 				&prom_phys_total[iter+1];
 		}
-		prom_phys_total[iter-1].theres_more = 0x0;
+		prom_phys_total[iter-1].theres_more = NULL;
 
 		node = prom_getchild(prom_root_node);
 		node = prom_searchsiblings(node, "virtual-memory");
@@ -158,7 +158,7 @@ void __init prom_meminit(void)
 			prom_prom_taken[iter].theres_more =
 				&prom_prom_taken[iter+1];
 		}
-		prom_prom_taken[iter-1].theres_more = 0x0;
+		prom_prom_taken[iter-1].theres_more = NULL;
 
 		prom_sortmemlist(prom_prom_taken);
 
@@ -182,15 +182,15 @@ void __init prom_meminit(void)
 	case PROM_SUN4:
 #ifdef CONFIG_SUN4	
 		/* how simple :) */
-		prom_phys_total[0].start_adr = 0x0;
+		prom_phys_total[0].start_adr = NULL;
 		prom_phys_total[0].num_bytes = *(sun4_romvec->memorysize);
-		prom_phys_total[0].theres_more = 0x0;
-		prom_prom_taken[0].start_adr = 0x0; 
+		prom_phys_total[0].theres_more = NULL;
+		prom_prom_taken[0].start_adr = NULL; 
 		prom_prom_taken[0].num_bytes = 0x0;
-		prom_prom_taken[0].theres_more = 0x0;
-		prom_phys_avail[0].start_adr = 0x0;
+		prom_prom_taken[0].theres_more = NULL;
+		prom_phys_avail[0].start_adr = NULL;
 		prom_phys_avail[0].num_bytes = *(sun4_romvec->memoryavail);
-		prom_phys_avail[0].theres_more = 0x0;
+		prom_phys_avail[0].theres_more = NULL;
 #endif
 		break;
 

arch/sparc/prom/sun4prom.c

@@ -151,7 +151,7 @@ struct linux_romvec * __init sun4_prom_init(void)
 	 * have more time, we can teach the penguin to say "By your
 	 * command" or "Activating turbo boost, Michael". :-)
 	 */
-	sun4_romvec->setLEDs(0x0);
+	sun4_romvec->setLEDs(NULL);
 	
 	printk("PROMLIB: Old Sun4 boot PROM monitor %s, romvec version %d\n",
 		sun4_romvec->monid,

arch/sparc64/kernel/irq.c

@@ -756,7 +756,7 @@ void handler_irq(int irq, struct pt_regs *regs)
 		clear_softint(clr_mask);
 	}
 #else
-	int should_forward = 1;
+	int should_forward = 0;
 
 	clear_softint(1 << irq);
 #endif
@@ -1007,10 +1007,10 @@ static int retarget_one_irq(struct irqaction *p, int goal_cpu)
 	}
 	upa_writel(tid | IMAP_VALID, imap);
 
-	while (!cpu_online(goal_cpu)) {
+	do {
 		if (++goal_cpu >= NR_CPUS)
 			goal_cpu = 0;
-	}
+	} while (!cpu_online(goal_cpu));
 
 	return goal_cpu;
 }

arch/x86_64/Kconfig

@@ -379,6 +379,11 @@ config GENERIC_IRQ_PROBE
 	bool
 	default y
 
+# we have no ISA slots, but we do have ISA-style DMA.
+config ISA_DMA_API
+	bool
+	default y
+
 menu "Power management options"
 
 source kernel/power/Kconfig

drivers/base/bus.c

@@ -405,9 +405,8 @@ void device_release_driver(struct device * dev)
 
 static void driver_detach(struct device_driver * drv)
 {
-	struct list_head * entry, * next;
-	list_for_each_safe(entry, next, &drv->devices) {
-		struct device * dev = container_of(entry, struct device, driver_list);
+	while (!list_empty(&drv->devices)) {
+		struct device * dev = container_of(drv->devices.next, struct device, driver_list);
 		device_release_driver(dev);
 	}
 }

drivers/base/core.c

@@ -139,7 +139,7 @@ static int dev_hotplug(struct kset *kset, struct kobject *kobj, char **envp,
 	buffer = &buffer[length];
 	buffer_size -= length;
 
-	if (dev->bus->hotplug) {
+	if (dev->bus && dev->bus->hotplug) {
 		/* have the bus specific function add its stuff */
 		retval = dev->bus->hotplug (dev, envp, num_envp, buffer, buffer_size);
 			if (retval) {

drivers/block/Kconfig

@@ -105,7 +105,7 @@ config ATARI_SLM
 
 config BLK_DEV_XD
 	tristate "XT hard disk support"
-	depends on ISA
+	depends on ISA && ISA_DMA_API
 	help
 	  Very old 8 bit hard disk controllers used in the IBM XT computer
 	  will be supported if you say Y here.

drivers/block/aoe/aoe.h

@@ -1,5 +1,5 @@
 /* Copyright (c) 2004 Coraid, Inc.  See COPYING for GPL terms. */
-#define VERSION "6"
+#define VERSION "10"
 #define AOE_MAJOR 152
 #define DEVICE_NAME "aoe"
 

drivers/block/aoe/aoeblk.c

@@ -37,6 +37,13 @@ static ssize_t aoedisk_show_netif(struct gendisk * disk, char *page)
 
 	return snprintf(page, PAGE_SIZE, "%s\n", d->ifp->name);
 }
+/* firmware version */
+static ssize_t aoedisk_show_fwver(struct gendisk * disk, char *page)
+{
+	struct aoedev *d = disk->private_data;
+
+	return snprintf(page, PAGE_SIZE, "0x%04x\n", (unsigned int) d->fw_ver);
+}
 
 static struct disk_attribute disk_attr_state = {
 	.attr = {.name = "state", .mode = S_IRUGO },
@@ -50,6 +57,10 @@ static struct disk_attribute disk_attr_netif = {
 	.attr = {.name = "netif", .mode = S_IRUGO },
 	.show = aoedisk_show_netif
 };
+static struct disk_attribute disk_attr_fwver = {
+	.attr = {.name = "firmware-version", .mode = S_IRUGO },
+	.show = aoedisk_show_fwver
+};
 
 static void
 aoedisk_add_sysfs(struct aoedev *d)
@@ -57,6 +68,7 @@ aoedisk_add_sysfs(struct aoedev *d)
 	sysfs_create_file(&d->gd->kobj, &disk_attr_state.attr);
 	sysfs_create_file(&d->gd->kobj, &disk_attr_mac.attr);
 	sysfs_create_file(&d->gd->kobj, &disk_attr_netif.attr);
+	sysfs_create_file(&d->gd->kobj, &disk_attr_fwver.attr);
 }
 void
 aoedisk_rm_sysfs(struct aoedev *d)
@@ -64,6 +76,7 @@ aoedisk_rm_sysfs(struct aoedev *d)
 	sysfs_remove_link(&d->gd->kobj, "state");
 	sysfs_remove_link(&d->gd->kobj, "mac");
 	sysfs_remove_link(&d->gd->kobj, "netif");
+	sysfs_remove_link(&d->gd->kobj, "firmware-version");
 }
 
 static int

drivers/block/aoe/aoedev.c

@@ -109,25 +109,22 @@ aoedev_set(ulong sysminor, unsigned char *addr, struct net_device *ifp, ulong bu
 	spin_lock_irqsave(&devlist_lock, flags);
 
 	for (d=devlist; d; d=d->next)
-		if (d->sysminor == sysminor
-		|| memcmp(d->addr, addr, sizeof d->addr) == 0)
+		if (d->sysminor == sysminor)
 			break;
 
 	if (d == NULL && (d = aoedev_newdev(bufcnt)) == NULL) {
 		spin_unlock_irqrestore(&devlist_lock, flags);
 		printk(KERN_INFO "aoe: aoedev_set: aoedev_newdev failure.\n");
 		return NULL;
-	}
+	} /* if newdev, (d->flags & DEVFL_UP) == 0 for below */
 
 	spin_unlock_irqrestore(&devlist_lock, flags);
 	spin_lock_irqsave(&d->lock, flags);
 
 	d->ifp = ifp;
-
-	if (d->sysminor != sysminor
-	|| (d->flags & DEVFL_UP) == 0) {
+	memcpy(d->addr, addr, sizeof d->addr);
+	if ((d->flags & DEVFL_UP) == 0) {
 		aoedev_downdev(d); /* flushes outstanding frames */
-		memcpy(d->addr, addr, sizeof d->addr);
 		d->sysminor = sysminor;
 		d->aoemajor = AOEMAJOR(sysminor);
 		d->aoeminor = AOEMINOR(sysminor);

drivers/block/aoe/aoenet.c

@@ -7,6 +7,7 @@
 #include <linux/hdreg.h>
 #include <linux/blkdev.h>
 #include <linux/netdevice.h>
+#include <linux/moduleparam.h>
 #include "aoe.h"
 
 #define NECODES 5
@@ -26,6 +27,19 @@ enum {
 };
 
 static char aoe_iflist[IFLISTSZ];
+module_param_string(aoe_iflist, aoe_iflist, IFLISTSZ, 0600);
+MODULE_PARM_DESC(aoe_iflist, "aoe_iflist=\"dev1 [dev2 ...]\"\n");
+
+#ifndef MODULE
+static int __init aoe_iflist_setup(char *str)
+{
+	strncpy(aoe_iflist, str, IFLISTSZ);
+	aoe_iflist[IFLISTSZ - 1] = '\0';
+	return 1;
+}
+
+__setup("aoe_iflist=", aoe_iflist_setup);
+#endif
 
 int
 is_aoe_netif(struct net_device *ifp)
@@ -36,7 +50,8 @@ is_aoe_netif(struct net_device *ifp)
 	if (aoe_iflist[0] == '\0')
 		return 1;
 
-	for (p = aoe_iflist; *p; p = q + strspn(q, WHITESPACE)) {
+	p = aoe_iflist + strspn(aoe_iflist, WHITESPACE);
+	for (; *p; p = q + strspn(q, WHITESPACE)) {
 		q = p + strcspn(p, WHITESPACE);
 		if (q != p)
 			len = q - p;

drivers/char/Kconfig

@@ -153,7 +153,7 @@ config DIGIEPCA
 
 config ESPSERIAL
 	tristate "Hayes ESP serial port support"
-	depends on SERIAL_NONSTANDARD && ISA && BROKEN_ON_SMP
+	depends on SERIAL_NONSTANDARD && ISA && BROKEN_ON_SMP && ISA_DMA_API
 	help
 	  This is a driver which supports Hayes ESP serial ports.  Both single
 	  port cards and multiport cards are supported.  Make sure to read
@@ -195,7 +195,7 @@ config ISI
 
 config SYNCLINK
 	tristate "Microgate SyncLink card support"
-	depends on SERIAL_NONSTANDARD && PCI
+	depends on SERIAL_NONSTANDARD && PCI && ISA_DMA_API
 	help
 	  Provides support for the SyncLink ISA and PCI multiprotocol serial
 	  adapters. These adapters support asynchronous and HDLC bit
@@ -408,7 +408,7 @@ config SGI_TIOCX
 
 config SGI_MBCS
        tristate "SGI FPGA Core Services driver support"
-       depends on (IA64_SGI_SN2 || IA64_GENERIC)
+       depends on SGI_TIOCX
        help
          If you have an SGI Altix with an attached SABrick
          say Y or M here, otherwise say N.

drivers/char/ipmi/ipmi_si_intf.c

@@ -1617,15 +1617,15 @@ typedef struct dmi_header
 	u16	handle;
 } dmi_header_t;
 
-static int decode_dmi(dmi_header_t *dm, int intf_num)
+static int decode_dmi(dmi_header_t __iomem *dm, int intf_num)
 {
-	u8		*data = (u8 *)dm;
+	u8		__iomem *data = (u8 __iomem *)dm;
 	unsigned long  	base_addr;
 	u8		reg_spacing;
-	u8              len = dm->length;
+	u8              len = readb(&dm->length);
 	dmi_ipmi_data_t *ipmi_data = dmi_data+intf_num;
 
-	ipmi_data->type = data[4];
+	ipmi_data->type = readb(&data[4]);
 
 	memcpy(&base_addr, data+8, sizeof(unsigned long));
 	if (len >= 0x11) {
@@ -1640,12 +1640,12 @@ static int decode_dmi(dmi_header_t *dm, int intf_num)
 		}
 		/* If bit 4 of byte 0x10 is set, then the lsb for the address
 		   is odd. */
-		ipmi_data->base_addr = base_addr | ((data[0x10] & 0x10) >> 4);
+		ipmi_data->base_addr = base_addr | ((readb(&data[0x10]) & 0x10) >> 4);
 
-		ipmi_data->irq = data[0x11];
+		ipmi_data->irq = readb(&data[0x11]);
 
 		/* The top two bits of byte 0x10 hold the register spacing. */
-		reg_spacing = (data[0x10] & 0xC0) >> 6;
+		reg_spacing = (readb(&data[0x10]) & 0xC0) >> 6;
 		switch(reg_spacing){
 		case 0x00: /* Byte boundaries */
 		    ipmi_data->offset = 1;
@@ -1673,7 +1673,7 @@ static int decode_dmi(dmi_header_t *dm, int intf_num)
 		ipmi_data->offset = 1;
 	}
 
-	ipmi_data->slave_addr = data[6];
+	ipmi_data->slave_addr = readb(&data[6]);
 
 	if (is_new_interface(-1, ipmi_data->addr_space,ipmi_data->base_addr)) {
 		dmi_data_entries++;
@@ -1687,9 +1687,9 @@ static int decode_dmi(dmi_header_t *dm, int intf_num)
 
 static int dmi_table(u32 base, int len, int num)
 {
-	u8 		  *buf;
-	struct dmi_header *dm;
-	u8 		  *data;
+	u8 		  __iomem *buf;
+	struct dmi_header __iomem *dm;
+	u8 		  __iomem *data;
 	int 		  i=1;
 	int		  status=-1;
 	int               intf_num = 0;
@@ -1702,12 +1702,12 @@ static int dmi_table(u32 base, int len, int num)
 
 	while(i<num && (data - buf) < len)
 	{
-		dm=(dmi_header_t *)data;
+		dm=(dmi_header_t __iomem *)data;
 
-		if((data-buf+dm->length) >= len)
+		if((data-buf+readb(&dm->length)) >= len)
         		break;
 
-		if (dm->type == 38) {
+		if (readb(&dm->type) == 38) {
 			if (decode_dmi(dm, intf_num) == 0) {
 				intf_num++;
 				if (intf_num >= SI_MAX_DRIVERS)
@@ -1715,8 +1715,8 @@ static int dmi_table(u32 base, int len, int num)
 			}
 		}
 
-	        data+=dm->length;
-		while((data-buf) < len && (*data || data[1]))
+	        data+=readb(&dm->length);
+		while((data-buf) < len && (readb(data)||readb(data+1)))
 			data++;
 		data+=2;
 		i++;

drivers/char/ipmi/ipmi_si_sm.h

@@ -51,7 +51,7 @@ struct si_sm_io
 	/* Generic info used by the actual handling routines, the
            state machine shouldn't touch these. */
 	void *info;
-	void *addr;
+	void __iomem *addr;
 	int  regspacing;
 	int  regsize;
 	int  regshift;

drivers/char/mbcs.c

@@ -394,7 +394,7 @@ int mbcs_open(struct inode *ip, struct file *fp)
 	return -ENODEV;
 }
 
-ssize_t mbcs_sram_read(struct file * fp, char *buf, size_t len, loff_t * off)
+ssize_t mbcs_sram_read(struct file * fp, char __user *buf, size_t len, loff_t * off)
 {
 	struct cx_dev *cx_dev = fp->private_data;
 	struct mbcs_soft *soft = cx_dev->soft;
@@ -419,7 +419,7 @@ ssize_t mbcs_sram_read(struct file * fp, char *buf, size_t len, loff_t * off)
 }
 
 ssize_t
-mbcs_sram_write(struct file * fp, const char *buf, size_t len, loff_t * off)
+mbcs_sram_write(struct file * fp, const char __user *buf, size_t len, loff_t * off)
 {
 	struct cx_dev *cx_dev = fp->private_data;
 	struct mbcs_soft *soft = cx_dev->soft;

drivers/char/mbcs.h

@@ -543,9 +543,9 @@ struct mbcs_soft {
 };
 
 extern int mbcs_open(struct inode *ip, struct file *fp);
-extern ssize_t mbcs_sram_read(struct file *fp, char *buf, size_t len,
+extern ssize_t mbcs_sram_read(struct file *fp, char __user *buf, size_t len,
 			      loff_t * off);
-extern ssize_t mbcs_sram_write(struct file *fp, const char *buf, size_t len,
+extern ssize_t mbcs_sram_write(struct file *fp, const char __user *buf, size_t len,
 			       loff_t * off);
 extern loff_t mbcs_sram_llseek(struct file *filp, loff_t off, int whence);
 extern int mbcs_gscr_mmap(struct file *fp, struct vm_area_struct *vma);

drivers/char/sonypi.c

@@ -1021,11 +1021,11 @@ static int sonypi_misc_ioctl(struct inode *ip, struct file *fp,
 			ret = -EIO;
 			break;
 		}
-		if (copy_to_user((u8 *)arg, &val8, sizeof(val8)))
+		if (copy_to_user(argp, &val8, sizeof(val8)))
 			ret = -EFAULT;
 		break;
 	case SONYPI_IOCSFAN:
-		if (copy_from_user(&val8, (u8 *)arg, sizeof(val8))) {
+		if (copy_from_user(&val8, argp, sizeof(val8))) {
 			ret = -EFAULT;
 			break;
 		}
@@ -1038,7 +1038,7 @@ static int sonypi_misc_ioctl(struct inode *ip, struct file *fp,
 			ret = -EIO;
 			break;
 		}
-		if (copy_to_user((u8 *)arg, &val8, sizeof(val8)))
+		if (copy_to_user(argp, &val8, sizeof(val8)))
 			ret = -EFAULT;
 		break;
 	default:

drivers/mmc/Kconfig

@@ -51,7 +51,7 @@ config MMC_PXA
 
 config MMC_WBSD
 	tristate "Winbond W83L51xD SD/MMC Card Interface support"
-	depends on MMC && ISA
+	depends on MMC && ISA && ISA_DMA_API
 	help
 	  This selects the Winbond(R) W83L51xD Secure digital and
           Multimedia card Interface.

drivers/net/Kconfig

@@ -589,7 +589,7 @@ config EL2
 
 config ELPLUS
 	tristate "3c505 \"EtherLink Plus\" support"
-	depends on NET_VENDOR_3COM && ISA
+	depends on NET_VENDOR_3COM && ISA && ISA_DMA_API
 	---help---
 	  Information about this network (Ethernet) card can be found in
 	  <file:Documentation/networking/3c505.txt>.  If you have a card of
@@ -630,7 +630,7 @@ config EL3
 
 config 3C515
 	tristate "3c515 ISA \"Fast EtherLink\""
-	depends on NET_VENDOR_3COM && (ISA || EISA)
+	depends on NET_VENDOR_3COM && (ISA || EISA) && ISA_DMA_API
 	help
 	  If you have a 3Com ISA EtherLink XL "Corkscrew" 3c515 Fast Ethernet
 	  network card, say Y and read the Ethernet-HOWTO, available from
@@ -708,7 +708,7 @@ config TYPHOON
 
 config LANCE
 	tristate "AMD LANCE and PCnet (AT1500 and NE2100) support"
-	depends on NET_ETHERNET && ISA
+	depends on NET_ETHERNET && ISA && ISA_DMA_API
 	help
 	  If you have a network (Ethernet) card of this type, say Y and read
 	  the Ethernet-HOWTO, available from
@@ -864,7 +864,7 @@ config NI52
 
 config NI65
 	tristate "NI6510 support"
-	depends on NET_VENDOR_RACAL && ISA
+	depends on NET_VENDOR_RACAL && ISA && ISA_DMA_API
 	help
 	  If you have a network (Ethernet) card of this type, say Y and read
 	  the Ethernet-HOWTO, available from
@@ -1072,7 +1072,7 @@ config NE2000
 
 config ZNET
 	tristate "Zenith Z-Note support (EXPERIMENTAL)"
-	depends on NET_ISA && EXPERIMENTAL
+	depends on NET_ISA && EXPERIMENTAL && ISA_DMA_API
 	help
 	  The Zenith Z-Note notebook computer has a built-in network
 	  (Ethernet) card, and this is the Linux driver for it. Note that the

drivers/net/appletalk/Kconfig

@@ -13,7 +13,7 @@ config DEV_APPLETALK
 
 config LTPC
 	tristate "Apple/Farallon LocalTalk PC support"
-	depends on DEV_APPLETALK && (ISA || EISA)
+	depends on DEV_APPLETALK && (ISA || EISA) && ISA_DMA_API
 	help
 	  This allows you to use the AppleTalk PC card to connect to LocalTalk
 	  networks. The card is also known as the Farallon PhoneNet PC card.

drivers/net/hamradio/Kconfig

@@ -45,7 +45,7 @@ config BPQETHER
 
 config DMASCC
 	tristate "High-speed (DMA) SCC driver for AX.25"
-	depends on ISA && AX25 && BROKEN_ON_SMP
+	depends on ISA && AX25 && BROKEN_ON_SMP && ISA_DMA_API
 	---help---
 	  This is a driver for high-speed SCC boards, i.e. those supporting
 	  DMA on one port. You usually use those boards to connect your
@@ -78,7 +78,7 @@ config DMASCC
 
 config SCC
 	tristate "Z8530 SCC driver"
-	depends on ISA && AX25
+	depends on ISA && AX25 && ISA_DMA_API
 	---help---
 	  These cards are used to connect your Linux box to an amateur radio
 	  in order to communicate with other computers. If you want to use

drivers/net/irda/Kconfig

@@ -310,7 +310,7 @@ config SIGMATEL_FIR
 
 config NSC_FIR
 	tristate "NSC PC87108/PC87338"
-	depends on IRDA
+	depends on IRDA && ISA_DMA_API
 	help
 	  Say Y here if you want to build support for the NSC PC87108 and
 	  PC87338 IrDA chipsets.  This driver supports SIR,
@@ -321,7 +321,7 @@ config NSC_FIR
 
 config WINBOND_FIR
 	tristate "Winbond W83977AF (IR)"
-	depends on IRDA
+	depends on IRDA && ISA_DMA_API
 	help
 	  Say Y here if you want to build IrDA support for the Winbond
 	  W83977AF super-io chipset.  This driver should be used for the IrDA
@@ -347,7 +347,7 @@ config AU1000_FIR
 
 config SMC_IRCC_FIR
 	tristate "SMSC IrCC (EXPERIMENTAL)"
-	depends on EXPERIMENTAL && IRDA
+	depends on EXPERIMENTAL && IRDA && ISA_DMA_API
 	help
 	  Say Y here if you want to build support for the SMC Infrared
 	  Communications Controller.  It is used in a wide variety of
@@ -357,7 +357,7 @@ config SMC_IRCC_FIR
 
 config ALI_FIR
 	tristate "ALi M5123 FIR (EXPERIMENTAL)"
-	depends on EXPERIMENTAL && IRDA
+	depends on EXPERIMENTAL && IRDA && ISA_DMA_API
 	help
 	  Say Y here if you want to build support for the ALi M5123 FIR
 	  Controller.  The ALi M5123 FIR Controller is embedded in ALi M1543C,
@@ -385,7 +385,7 @@ config SA1100_FIR
 
 config VIA_FIR
 	tristate "VIA VT8231/VT1211 SIR/MIR/FIR"
-	depends on IRDA
+	depends on IRDA && ISA_DMA_API
 	help
 	  Say Y here if you want to build support for the VIA VT8231
 	  and VIA VT1211 IrDA controllers, found on the motherboards using

drivers/net/ppp_deflate.c

@@ -87,8 +87,7 @@ static void z_comp_free(void *arg)
 
 	if (state) {
 		zlib_deflateEnd(&state->strm);
-		if (state->strm.workspace)
-			vfree(state->strm.workspace);
+		vfree(state->strm.workspace);
 		kfree(state);
 	}
 }
@@ -308,8 +307,7 @@ static void z_decomp_free(void *arg)
 
 	if (state) {
 		zlib_inflateEnd(&state->strm);
-		if (state->strm.workspace)
-			kfree(state->strm.workspace);
+		kfree(state->strm.workspace);
 		kfree(state);
 	}
 }

drivers/net/ppp_generic.c

@@ -2467,14 +2467,10 @@ static void ppp_destroy_interface(struct ppp *ppp)
 	skb_queue_purge(&ppp->mrq);
 #endif /* CONFIG_PPP_MULTILINK */
 #ifdef CONFIG_PPP_FILTER
-	if (ppp->pass_filter) {
-		kfree(ppp->pass_filter);
-		ppp->pass_filter = NULL;
-	}
-	if (ppp->active_filter) {
-		kfree(ppp->active_filter);
-		ppp->active_filter = NULL;
-	}
+	kfree(ppp->pass_filter);
+	ppp->pass_filter = NULL;
+	kfree(ppp->active_filter);
+	ppp->active_filter = NULL;
 #endif /* CONFIG_PPP_FILTER */
 
 	kfree(ppp);

drivers/net/wan/Kconfig

@@ -26,7 +26,7 @@ config WAN
 # There is no way to detect a comtrol sv11 - force it modular for now.
 config HOSTESS_SV11
 	tristate "Comtrol Hostess SV-11 support"
-	depends on WAN && ISA && m
+	depends on WAN && ISA && m && ISA_DMA_API
 	help
 	  Driver for Comtrol Hostess SV-11 network card which
 	  operates on low speed synchronous serial links at up to
@@ -38,7 +38,7 @@ config HOSTESS_SV11
 # The COSA/SRP driver has not been tested as non-modular yet.
 config COSA
 	tristate "COSA/SRP sync serial boards support"
-	depends on WAN && ISA && m
+	depends on WAN && ISA && m && ISA_DMA_API
 	---help---
 	  Driver for COSA and SRP synchronous serial boards.
 
@@ -127,7 +127,7 @@ config LANMEDIA
 # There is no way to detect a Sealevel board. Force it modular
 config SEALEVEL_4021
 	tristate "Sealevel Systems 4021 support"
-	depends on WAN && ISA && m
+	depends on WAN && ISA && m && ISA_DMA_API
 	help
 	  This is a driver for the Sealevel Systems ACB 56 serial I/O adapter.
 

drivers/net/wan/cycx_x25.c

@@ -436,9 +436,7 @@ static int cycx_wan_new_if(struct wan_device *wandev, struct net_device *dev,
 	}
 
 	if (err) {
-		if (chan->local_addr)
-			kfree(chan->local_addr);
-
+		kfree(chan->local_addr);
 		kfree(chan);
 		return err;
 	}
@@ -458,9 +456,7 @@ static int cycx_wan_del_if(struct wan_device *wandev, struct net_device *dev)
 		struct cycx_x25_channel *chan = dev->priv;
 
 		if (chan->svc) {
-			if (chan->local_addr)
-				kfree(chan->local_addr);
-
+			kfree(chan->local_addr);
 			if (chan->state == WAN_CONNECTED)
 				del_timer(&chan->timer);
 		}

drivers/net/wan/pc300_tty.c

@@ -400,10 +400,8 @@ static void cpc_tty_close(struct tty_struct *tty, struct file *flip)
 		cpc_tty->buf_rx.last = NULL;
 	}
 	
-	if (cpc_tty->buf_tx) {
-		kfree(cpc_tty->buf_tx);
-		cpc_tty->buf_tx = NULL;
-	}
+	kfree(cpc_tty->buf_tx);
+	cpc_tty->buf_tx = NULL;
 
 	CPC_TTY_DBG("%s: TTY closed\n",cpc_tty->name);
 	
@@ -666,7 +664,7 @@ static void cpc_tty_rx_work(void * data)
 	unsigned long port;
 	int i, j;
 	st_cpc_tty_area *cpc_tty; 
-	volatile st_cpc_rx_buf * buf;
+	volatile st_cpc_rx_buf *buf;
 	char flags=0,flg_rx=1; 
 	struct tty_ldisc *ld;
 
@@ -680,9 +678,9 @@ static void cpc_tty_rx_work(void * data)
 			cpc_tty = &cpc_tty_area[port];
 		
 			if ((buf=cpc_tty->buf_rx.first) != 0) {
-				if(cpc_tty->tty) {
+				if (cpc_tty->tty) {
 					ld = tty_ldisc_ref(cpc_tty->tty);
-					if(ld) {
+					if (ld) {
 						if (ld->receive_buf) {
 							CPC_TTY_DBG("%s: call line disc. receive_buf\n",cpc_tty->name);
 							ld->receive_buf(cpc_tty->tty, (char *)(buf->data), &flags, buf->size);
@@ -691,7 +689,7 @@ static void cpc_tty_rx_work(void * data)
 					}
 				}	
 				cpc_tty->buf_rx.first = cpc_tty->buf_rx.first->next;
-				kfree((unsigned char *)buf);
+				kfree(buf);
 				buf = cpc_tty->buf_rx.first;
 				flg_rx = 1;
 			}
@@ -733,7 +731,7 @@ static void cpc_tty_rx_disc_frame(pc300ch_t *pc300chan)
 
 void cpc_tty_receive(pc300dev_t *pc300dev)
 {
-	st_cpc_tty_area    *cpc_tty; 
+	st_cpc_tty_area *cpc_tty; 
 	pc300ch_t *pc300chan = (pc300ch_t *)pc300dev->chan; 
 	pc300_t *card = (pc300_t *)pc300chan->card; 
 	int ch = pc300chan->channel; 
@@ -742,7 +740,7 @@ void cpc_tty_receive(pc300dev_t *pc300dev)
 	int rx_len, rx_aux; 
 	volatile unsigned char status; 
 	unsigned short first_bd = pc300chan->rx_first_bd;
-	st_cpc_rx_buf	*new=NULL;
+	st_cpc_rx_buf *new = NULL;
 	unsigned char dsr_rx;
 
 	if (pc300dev->cpc_tty == NULL) { 
@@ -762,7 +760,7 @@ void cpc_tty_receive(pc300dev_t *pc300dev)
 			if (status & DST_EOM) {
 				break;
 			}
-			ptdescr=(pcsca_bd_t __iomem *)(card->hw.rambase+cpc_readl(&ptdescr->next));
+			ptdescr = (pcsca_bd_t __iomem *)(card->hw.rambase+cpc_readl(&ptdescr->next));
 		}
 			
 		if (!rx_len) { 
@@ -771,10 +769,7 @@ void cpc_tty_receive(pc300dev_t *pc300dev)
 				cpc_writel(card->hw.scabase + DRX_REG(EDAL, ch), 
 						RX_BD_ADDR(ch, pc300chan->rx_last_bd)); 
 			}
-			if (new) {
-				kfree(new);
-				new = NULL;
-			}
+			kfree(new);
 			return; 
 		}
 		
@@ -787,7 +782,7 @@ void cpc_tty_receive(pc300dev_t *pc300dev)
 			continue;
 		} 
 		
-		new = (st_cpc_rx_buf *) kmalloc(rx_len + sizeof(st_cpc_rx_buf), GFP_ATOMIC);
+		new = (st_cpc_rx_buf *)kmalloc(rx_len + sizeof(st_cpc_rx_buf), GFP_ATOMIC);
 		if (new == 0) {
 			cpc_tty_rx_disc_frame(pc300chan);
 			continue;

drivers/net/wan/sdla_chdlc.c

@@ -3664,15 +3664,10 @@ static void wanpipe_tty_close(struct tty_struct *tty, struct file * filp)
 		chdlc_disable_comm_shutdown(card);
 		unlock_adapter_irq(&card->wandev.lock,&smp_flags);
 
-		if (card->tty_buf){
-			kfree(card->tty_buf);
-			card->tty_buf=NULL;			
-		}
-
-		if (card->tty_rx){
-			kfree(card->tty_rx);
-			card->tty_rx=NULL;
-		}
+		kfree(card->tty_buf);
+		card->tty_buf = NULL;			
+		kfree(card->tty_rx);
+		card->tty_rx = NULL;
 	}
 	return;
 }

drivers/net/wan/x25_asy.c

@@ -107,13 +107,9 @@ static struct x25_asy *x25_asy_alloc(void)
 static void x25_asy_free(struct x25_asy *sl)
 {
 	/* Free all X.25 frame buffers. */
-	if (sl->rbuff)  {
-		kfree(sl->rbuff);
-	}
+	kfree(sl->rbuff);
 	sl->rbuff = NULL;
-	if (sl->xbuff)  {
-		kfree(sl->xbuff);
-	}
+	kfree(sl->xbuff);
 	sl->xbuff = NULL;
 
 	if (!test_and_clear_bit(SLF_INUSE, &sl->flags)) {
@@ -134,10 +130,8 @@ static int x25_asy_change_mtu(struct net_device *dev, int newmtu)
 	{
 		printk("%s: unable to grow X.25 buffers, MTU change cancelled.\n",
 		       dev->name);
-		if (xbuff != NULL)  
-			kfree(xbuff);
-		if (rbuff != NULL)  
-			kfree(rbuff);
+		kfree(xbuff);
+		kfree(rbuff);
 		return -ENOMEM;
 	}
 
@@ -169,10 +163,8 @@ static int x25_asy_change_mtu(struct net_device *dev, int newmtu)
 
 	spin_unlock_bh(&sl->lock);
 
-	if (xbuff != NULL) 
-		kfree(xbuff);
-	if (rbuff != NULL)
-		kfree(rbuff);
+	kfree(xbuff);
+	kfree(rbuff);
 	return 0;
 }
 

drivers/parport/Kconfig

@@ -34,7 +34,7 @@ config PARPORT
 
 config PARPORT_PC
 	tristate "PC-style hardware"
-	depends on PARPORT && (!SPARC64 || PCI) && (!SPARC32 || BROKEN)
+	depends on PARPORT && (!SPARC64 || PCI) && !SPARC32
 	---help---
 	  You should say Y here if you have a PC-style parallel port. All
 	  IBM PC compatible computers and some Alphas have PC-style

drivers/parport/parport_pc.c

@@ -67,6 +67,10 @@
 
 #define PARPORT_PC_MAX_PORTS PARPORT_MAX
 
+#ifdef CONFIG_ISA_DMA_API
+#define HAS_DMA
+#endif
+
 /* ECR modes */
 #define ECR_SPP 00
 #define ECR_PS2 01
@@ -610,6 +614,7 @@ dump_parport_state ("leave fifo_write_block_pio", port);
 	return length - left;
 }
 
+#ifdef HAS_DMA
 static size_t parport_pc_fifo_write_block_dma (struct parport *port,
 					       const void *buf, size_t length)
 {
@@ -732,6 +737,17 @@ dump_parport_state ("enter fifo_write_block_dma", port);
 dump_parport_state ("leave fifo_write_block_dma", port);
 	return length - left;
 }
+#endif
+
+static inline size_t parport_pc_fifo_write_block(struct parport *port,
+					       const void *buf, size_t length)
+{
+#ifdef HAS_DMA
+	if (port->dma != PARPORT_DMA_NONE)
+		return parport_pc_fifo_write_block_dma (port, buf, length);
+#endif
+	return parport_pc_fifo_write_block_pio (port, buf, length);
+}
 
 /* Parallel Port FIFO mode (ECP chipsets) */
 static size_t parport_pc_compat_write_block_pio (struct parport *port,
@@ -758,10 +774,7 @@ static size_t parport_pc_compat_write_block_pio (struct parport *port,
 	port->physport->ieee1284.phase = IEEE1284_PH_FWD_DATA;
 
 	/* Write the data to the FIFO. */
-	if (port->dma != PARPORT_DMA_NONE)
-		written = parport_pc_fifo_write_block_dma (port, buf, length);
-	else
-		written = parport_pc_fifo_write_block_pio (port, buf, length);
+	written = parport_pc_fifo_write_block(port, buf, length);
 
 	/* Finish up. */
 	/* For some hardware we don't want to touch the mode until
@@ -856,10 +869,7 @@ static size_t parport_pc_ecp_write_block_pio (struct parport *port,
 	port->physport->ieee1284.phase = IEEE1284_PH_FWD_DATA;
 
 	/* Write the data to the FIFO. */
-	if (port->dma != PARPORT_DMA_NONE)
-		written = parport_pc_fifo_write_block_dma (port, buf, length);
-	else
-		written = parport_pc_fifo_write_block_pio (port, buf, length);
+	written = parport_pc_fifo_write_block(port, buf, length);
 
 	/* Finish up. */
 	/* For some hardware we don't want to touch the mode until
@@ -2285,6 +2295,7 @@ struct parport *parport_pc_probe_port (unsigned long int base,
 		}
 
 #ifdef CONFIG_PARPORT_PC_FIFO
+#ifdef HAS_DMA
 		if (p->dma != PARPORT_DMA_NONE) {
 			if (request_dma (p->dma, p->name)) {
 				printk (KERN_WARNING "%s: dma %d in use, "
@@ -2306,7 +2317,8 @@ struct parport *parport_pc_probe_port (unsigned long int base,
 				}
 			}
 		}
-#endif /* CONFIG_PARPORT_PC_FIFO */
+#endif
+#endif
 	}
 
 	/* Done probing.  Now put the port into a sensible start-up state. */
@@ -2367,11 +2379,13 @@ void parport_pc_unregister_port (struct parport *p)
 	if (p->modes & PARPORT_MODE_ECP)
 		release_region(p->base_hi, 3);
 #ifdef CONFIG_PARPORT_PC_FIFO
+#ifdef HAS_DMA
 	if (priv->dma_buf)
 		pci_free_consistent(priv->dev, PAGE_SIZE,
 				    priv->dma_buf,
 				    priv->dma_handle);
-#endif /* CONFIG_PARPORT_PC_FIFO */
+#endif
+#endif
 	kfree (p->private_data);
 	parport_put_port(p);
 	kfree (ops); /* hope no-one cached it */

drivers/pci/hotplug/ibmphp.h

@@ -196,7 +196,7 @@ struct ebda_hpc_bus {
 
 
 /********************************************************************
-*   THREE TYPE OF HOT PLUG CONTROLER                                *
+*   THREE TYPE OF HOT PLUG CONTROLLER                                *
 ********************************************************************/
 
 struct isa_ctlr_access {

drivers/pci/hotplug/ibmphp_hpc.c

@@ -64,7 +64,7 @@ static int to_debug = FALSE;
 #define WPG_I2C_OR		0x2000	// I2C OR operation
 
 //----------------------------------------------------------------------------
-// Command set for I2C Master Operation Setup Regisetr
+// Command set for I2C Master Operation Setup Register
 //----------------------------------------------------------------------------
 #define WPG_READATADDR_MASK	0x00010000	// read,bytes,I2C shifted,index
 #define WPG_WRITEATADDR_MASK	0x40010000	// write,bytes,I2C shifted,index
@@ -835,7 +835,7 @@ static void poll_hpc (void)
 		if (ibmphp_shutdown) 
 			break;
 		
-		/* try to get the lock to do some kind of harware access */
+		/* try to get the lock to do some kind of hardware access */
 		down (&semOperations);
 
 		switch (poll_state) {
@@ -906,7 +906,7 @@ static void poll_hpc (void)
 				poll_state = POLL_LATCH_REGISTER;
 			break;
 		}	
-		/* give up the harware semaphore */
+		/* give up the hardware semaphore */
 		up (&semOperations);
 		/* sleep for a short time just for good measure */
 		msleep(100);

drivers/pci/hotplug/ibmphp_pci.c

@@ -1308,10 +1308,10 @@ static int unconfigure_boot_device (u8 busno, u8 device, u8 function)
 			/* ????????? DO WE NEED TO WRITE ANYTHING INTO THE PCI CONFIG SPACE BACK ?????????? */
 		} else {
 			/* This is Memory */
-			start_address &= PCI_BASE_ADDRESS_MEM_MASK;
 			if (start_address & PCI_BASE_ADDRESS_MEM_PREFETCH) {
 				/* pfmem */
 				debug ("start address of pfmem is %x\n", start_address);
+				start_address &= PCI_BASE_ADDRESS_MEM_MASK;
 
 				if (ibmphp_find_resource (bus, start_address, &pfmem, PFMEM) < 0) {
 					err ("cannot find corresponding PFMEM resource to remove\n");
@@ -1325,6 +1325,8 @@ static int unconfigure_boot_device (u8 busno, u8 device, u8 function)
 			} else {
 				/* regular memory */
 				debug ("start address of mem is %x\n", start_address);
+				start_address &= PCI_BASE_ADDRESS_MEM_MASK;
+
 				if (ibmphp_find_resource (bus, start_address, &mem, MEM) < 0) {
 					err ("cannot find corresponding MEM resource to remove\n");
 					return -EIO;
@@ -1422,9 +1424,9 @@ static int unconfigure_boot_bridge (u8 busno, u8 device, u8 function)
 			/* ????????? DO WE NEED TO WRITE ANYTHING INTO THE PCI CONFIG SPACE BACK ?????????? */
 		} else {
 			/* This is Memory */
-			start_address &= PCI_BASE_ADDRESS_MEM_MASK;
 			if (start_address & PCI_BASE_ADDRESS_MEM_PREFETCH) {
 				/* pfmem */
+				start_address &= PCI_BASE_ADDRESS_MEM_MASK;
 				if (ibmphp_find_resource (bus, start_address, &pfmem, PFMEM) < 0) {
 					err ("cannot find corresponding PFMEM resource to remove\n");
 					return -EINVAL;
@@ -1436,6 +1438,7 @@ static int unconfigure_boot_bridge (u8 busno, u8 device, u8 function)
 				}
 			} else {
 				/* regular memory */
+				start_address &= PCI_BASE_ADDRESS_MEM_MASK;
 				if (ibmphp_find_resource (bus, start_address, &mem, MEM) < 0) {
 					err ("cannot find corresponding MEM resource to remove\n");
 					return -EINVAL;

drivers/pci/hotplug/pci_hotplug.h

@@ -150,7 +150,7 @@ struct hotplug_slot_info {
  * @name: the name of the slot being registered.  This string must
  * be unique amoung slots registered on this system.
  * @ops: pointer to the &struct hotplug_slot_ops to be used for this slot
- * @info: pointer to the &struct hotplug_slot_info for the inital values for
+ * @info: pointer to the &struct hotplug_slot_info for the initial values for
  * this slot.
  * @release: called during pci_hp_deregister to free memory allocated in a
  * hotplug_slot structure.

drivers/pci/hotplug/pciehp_core.c

@@ -90,6 +90,22 @@ static struct hotplug_slot_ops pciehp_hotplug_slot_ops = {
   	.get_cur_bus_speed =	get_cur_bus_speed,
 };
 
+/**
+ * release_slot - free up the memory used by a slot
+ * @hotplug_slot: slot to free
+ */
+static void release_slot(struct hotplug_slot *hotplug_slot)
+{
+	struct slot *slot = hotplug_slot->private;
+
+	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
+
+	kfree(slot->hotplug_slot->info);
+	kfree(slot->hotplug_slot->name);
+	kfree(slot->hotplug_slot);
+	kfree(slot);
+}
+
 static int init_slots(struct controller *ctrl)
 {
 	struct slot *new_slot;
@@ -139,7 +155,8 @@ static int init_slots(struct controller *ctrl)
 
 		/* register this slot with the hotplug pci core */
 		new_slot->hotplug_slot->private = new_slot;
-		make_slot_name (new_slot->hotplug_slot->name, SLOT_NAME_SIZE, new_slot);
+		new_slot->hotplug_slot->release = &release_slot;
+		make_slot_name(new_slot->hotplug_slot->name, SLOT_NAME_SIZE, new_slot);
 		new_slot->hotplug_slot->ops = &pciehp_hotplug_slot_ops;
 
 		new_slot->hpc_ops->get_power_status(new_slot, &(new_slot->hotplug_slot->info->power_status));
@@ -188,10 +205,6 @@ static int cleanup_slots (struct controller * ctrl)
 	while (old_slot) {
 		next_slot = old_slot->next;
 		pci_hp_deregister (old_slot->hotplug_slot);
-		kfree(old_slot->hotplug_slot->info);
-		kfree(old_slot->hotplug_slot->name);
-		kfree(old_slot->hotplug_slot);
-		kfree(old_slot);
 		old_slot = next_slot;
 	}
 

drivers/pci/hotplug/pcihp_skeleton.c

@@ -297,7 +297,7 @@ static int __init init_slots(void)
 		hotplug_slot->ops = &skel_hotplug_slot_ops;
 		
 		/*
-		 * Initilize the slot info structure with some known
+		 * Initialize the slot info structure with some known
 		 * good values.
 		 */
 		info->power_status = get_power_status(slot);

drivers/pci/msi.c

@@ -522,7 +522,7 @@ void pci_scan_msi_device(struct pci_dev *dev)
  * msi_capability_init - configure device's MSI capability structure
  * @dev: pointer to the pci_dev data structure of MSI device function
  *
- * Setup the MSI capability structure of device funtion with a single
+ * Setup the MSI capability structure of device function with a single
  * MSI vector, regardless of device function is capable of handling
  * multiple messages. A return of zero indicates the successful setup
  * of an entry zero with the new MSI vector or non-zero for otherwise.
@@ -599,7 +599,7 @@ static int msi_capability_init(struct pci_dev *dev)
  * msix_capability_init - configure device's MSI-X capability
  * @dev: pointer to the pci_dev data structure of MSI-X device function
  *
- * Setup the MSI-X capability structure of device funtion with a
+ * Setup the MSI-X capability structure of device function with a
  * single MSI-X vector. A return of zero indicates the successful setup of
  * requested MSI-X entries with allocated vectors or non-zero for otherwise.
  **/
@@ -1074,7 +1074,7 @@ void pci_disable_msix(struct pci_dev* dev)
  * msi_remove_pci_irq_vectors - reclaim MSI(X) vectors to unused state
  * @dev: pointer to the pci_dev data structure of MSI(X) device function
  *
- * Being called during hotplug remove, from which the device funciton
+ * Being called during hotplug remove, from which the device function
  * is hot-removed. All previous assigned MSI/MSI-X vectors, if
  * allocated for this device function, are reclaimed to unused state,
  * which may be used later on.

drivers/pci/pci-acpi.c

@@ -19,7 +19,7 @@
 
 static u32 ctrlset_buf[3] = {0, 0, 0};
 static u32 global_ctrlsets = 0;
-u8 OSC_UUID[16] = {0x5B, 0x4D, 0xDB, 0x33, 0xF7, 0x1F, 0x1C, 0x40, 0x96, 0x57, 0x74, 0x41, 0xC0, 0x3D, 0xD7, 0x66};
+static u8 OSC_UUID[16] = {0x5B, 0x4D, 0xDB, 0x33, 0xF7, 0x1F, 0x1C, 0x40, 0x96, 0x57, 0x74, 0x41, 0xC0, 0x3D, 0xD7, 0x66};
 
 static acpi_status  
 acpi_query_osc (

drivers/pci/pci-driver.c

@@ -318,6 +318,14 @@ static int pci_device_resume(struct device * dev)
 	return 0;
 }
 
+static void pci_device_shutdown(struct device *dev)
+{
+	struct pci_dev *pci_dev = to_pci_dev(dev);
+	struct pci_driver *drv = pci_dev->driver;
+
+	if (drv && drv->shutdown)
+		drv->shutdown(pci_dev);
+}
 
 #define kobj_to_pci_driver(obj) container_of(obj, struct device_driver, kobj)
 #define attr_to_driver_attribute(obj) container_of(obj, struct driver_attribute, attr)
@@ -373,7 +381,7 @@ pci_populate_driver_dir(struct pci_driver *drv)
  * 
  * Adds the driver structure to the list of registered drivers.
  * Returns a negative value on error, otherwise 0. 
- * If no error occured, the driver remains registered even if 
+ * If no error occurred, the driver remains registered even if 
  * no device was claimed during registration.
  */
 int pci_register_driver(struct pci_driver *drv)
@@ -385,6 +393,7 @@ int pci_register_driver(struct pci_driver *drv)
 	drv->driver.bus = &pci_bus_type;
 	drv->driver.probe = pci_device_probe;
 	drv->driver.remove = pci_device_remove;
+	drv->driver.shutdown = pci_device_shutdown,
 	drv->driver.owner = drv->owner;
 	drv->driver.kobj.ktype = &pci_driver_kobj_type;
 	pci_init_dynids(&drv->dynids);

drivers/pci/pci-sysfs.c

@@ -91,6 +91,7 @@ pci_read_config(struct kobject *kobj, char *buf, loff_t off, size_t count)
 	struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
 	unsigned int size = 64;
 	loff_t init_off = off;
+	u8 *data = (u8*) buf;
 
 	/* Several chips lock up trying to read undefined config space */
 	if (capable(CAP_SYS_ADMIN)) {
@@ -108,30 +109,47 @@ pci_read_config(struct kobject *kobj, char *buf, loff_t off, size_t count)
 		size = count;
 	}
 
-	while (off & 3) {
-		unsigned char val;
+	if ((off & 1) && size) {
+		u8 val;
 		pci_read_config_byte(dev, off, &val);
-		buf[off - init_off] = val;
+		data[off - init_off] = val;
 		off++;
-		if (--size == 0)
-			break;
+		size--;
+	}
+
+	if ((off & 3) && size > 2) {
+		u16 val;
+		pci_read_config_word(dev, off, &val);
+		data[off - init_off] = val & 0xff;
+		data[off - init_off + 1] = (val >> 8) & 0xff;
+		off += 2;
+		size -= 2;
 	}
 
 	while (size > 3) {
-		unsigned int val;
+		u32 val;
 		pci_read_config_dword(dev, off, &val);
-		buf[off - init_off] = val & 0xff;
-		buf[off - init_off + 1] = (val >> 8) & 0xff;
-		buf[off - init_off + 2] = (val >> 16) & 0xff;
-		buf[off - init_off + 3] = (val >> 24) & 0xff;
+		data[off - init_off] = val & 0xff;
+		data[off - init_off + 1] = (val >> 8) & 0xff;
+		data[off - init_off + 2] = (val >> 16) & 0xff;
+		data[off - init_off + 3] = (val >> 24) & 0xff;
 		off += 4;
 		size -= 4;
 	}
 
-	while (size > 0) {
-		unsigned char val;
+	if (size >= 2) {
+		u16 val;
+		pci_read_config_word(dev, off, &val);
+		data[off - init_off] = val & 0xff;
+		data[off - init_off + 1] = (val >> 8) & 0xff;
+		off += 2;
+		size -= 2;
+	}
+
+	if (size > 0) {
+		u8 val;
 		pci_read_config_byte(dev, off, &val);
-		buf[off - init_off] = val;
+		data[off - init_off] = val;
 		off++;
 		--size;
 	}
@@ -145,6 +163,7 @@ pci_write_config(struct kobject *kobj, char *buf, loff_t off, size_t count)
 	struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
 	unsigned int size = count;
 	loff_t init_off = off;
+	u8 *data = (u8*) buf;
 
 	if (off > dev->cfg_size)
 		return 0;
@@ -152,26 +171,41 @@ pci_write_config(struct kobject *kobj, char *buf, loff_t off, size_t count)
 		size = dev->cfg_size - off;
 		count = size;
 	}
-
-	while (off & 3) {
-		pci_write_config_byte(dev, off, buf[off - init_off]);
+	
+	if ((off & 1) && size) {
+		pci_write_config_byte(dev, off, data[off - init_off]);
 		off++;
-		if (--size == 0)
-			break;
+		size--;
 	}
+	
+	if ((off & 3) && size > 2) {
+		u16 val = data[off - init_off];
+		val |= (u16) data[off - init_off + 1] << 8;
+                pci_write_config_word(dev, off, val);
+                off += 2;
+                size -= 2;
+        }
 
 	while (size > 3) {
-		unsigned int val = buf[off - init_off];
-		val |= (unsigned int) buf[off - init_off + 1] << 8;
-		val |= (unsigned int) buf[off - init_off + 2] << 16;
-		val |= (unsigned int) buf[off - init_off + 3] << 24;
+		u32 val = data[off - init_off];
+		val |= (u32) data[off - init_off + 1] << 8;
+		val |= (u32) data[off - init_off + 2] << 16;
+		val |= (u32) data[off - init_off + 3] << 24;
 		pci_write_config_dword(dev, off, val);
 		off += 4;
 		size -= 4;
 	}
+	
+	if (size >= 2) {
+		u16 val = data[off - init_off];
+		val |= (u16) data[off - init_off + 1] << 8;
+		pci_write_config_word(dev, off, val);
+		off += 2;
+		size -= 2;
+	}
 
-	while (size > 0) {
-		pci_write_config_byte(dev, off, buf[off - init_off]);
+	if (size) {
+		pci_write_config_byte(dev, off, data[off - init_off]);
 		off++;
 		--size;
 	}

drivers/pci/pci.c

@@ -16,6 +16,7 @@
 #include <linux/module.h>
 #include <linux/spinlock.h>
 #include <asm/dma.h>	/* isa_dma_bridge_buggy */
+#include "pci.h"
 
 
 /**
@@ -398,10 +399,10 @@ pci_enable_device(struct pci_dev *dev)
 {
 	int err;
 
-	dev->is_enabled = 1;
 	if ((err = pci_enable_device_bars(dev, (1 << PCI_NUM_RESOURCES) - 1)))
 		return err;
 	pci_fixup_device(pci_fixup_enable, dev);
+	dev->is_enabled = 1;
 	return 0;
 }
 
@@ -427,16 +428,15 @@ pci_disable_device(struct pci_dev *dev)
 {
 	u16 pci_command;
 	
-	dev->is_enabled = 0;
-	dev->is_busmaster = 0;
-
 	pci_read_config_word(dev, PCI_COMMAND, &pci_command);
 	if (pci_command & PCI_COMMAND_MASTER) {
 		pci_command &= ~PCI_COMMAND_MASTER;
 		pci_write_config_word(dev, PCI_COMMAND, pci_command);
 	}
+	dev->is_busmaster = 0;
 
 	pcibios_disable_device(dev);
+	dev->is_enabled = 0;
 }
 
 /**
@@ -748,17 +748,6 @@ pci_set_dma_mask(struct pci_dev *dev, u64 mask)
 	return 0;
 }
     
-int
-pci_dac_set_dma_mask(struct pci_dev *dev, u64 mask)
-{
-	if (!pci_dac_dma_supported(dev, mask))
-		return -EIO;
-
-	dev->dma_mask = mask;
-
-	return 0;
-}
-
 int
 pci_set_consistent_dma_mask(struct pci_dev *dev, u64 mask)
 {
@@ -821,7 +810,6 @@ EXPORT_SYMBOL(pci_set_master);
 EXPORT_SYMBOL(pci_set_mwi);
 EXPORT_SYMBOL(pci_clear_mwi);
 EXPORT_SYMBOL(pci_set_dma_mask);
-EXPORT_SYMBOL(pci_dac_set_dma_mask);
 EXPORT_SYMBOL(pci_set_consistent_dma_mask);
 EXPORT_SYMBOL(pci_assign_resource);
 EXPORT_SYMBOL(pci_find_parent_resource);

drivers/pci/probe.c

@@ -9,6 +9,7 @@
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/cpumask.h>
+#include "pci.h"
 
 #define CARDBUS_LATENCY_TIMER	176	/* secondary latency timer */
 #define CARDBUS_RESERVE_BUSNR	3

drivers/pci/proc.c

@@ -15,6 +15,7 @@
 
 #include <asm/uaccess.h>
 #include <asm/byteorder.h>
+#include "pci.h"
 
 static int proc_initialized;	/* = 0 */
 

drivers/pci/quirks.c

@@ -18,6 +18,7 @@
 #include <linux/pci.h>
 #include <linux/init.h>
 #include <linux/delay.h>
+#include "pci.h"
 
 /* Deal with broken BIOS'es that neglect to enable passive release,
    which can cause problems in combination with the 82441FX/PPro MTRRs */
@@ -328,6 +329,7 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL,    PCI_DEVICE_ID_INTEL_82801CA_12,
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL,    PCI_DEVICE_ID_INTEL_82801DB_0,		quirk_ich4_lpc_acpi );
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL,    PCI_DEVICE_ID_INTEL_82801DB_12,	quirk_ich4_lpc_acpi );
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL,    PCI_DEVICE_ID_INTEL_82801EB_0,		quirk_ich4_lpc_acpi );
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL,    PCI_DEVICE_ID_INTEL_ESB_1,		quirk_ich4_lpc_acpi );
 
 /*
  * VIA ACPI: One IO region pointed to by longword at

drivers/scsi/Kconfig

@@ -260,7 +260,7 @@ config SCSI_3W_9XXX
 
 config SCSI_7000FASST
 	tristate "7000FASST SCSI support"
-	depends on ISA && SCSI
+	depends on ISA && SCSI && ISA_DMA_API
 	help
 	  This driver supports the Western Digital 7000 SCSI host adapter
 	  family.  Some information is in the source:
@@ -295,7 +295,7 @@ config SCSI_AHA152X
 
 config SCSI_AHA1542
 	tristate "Adaptec AHA1542 support"
-	depends on ISA && SCSI
+	depends on ISA && SCSI && ISA_DMA_API
 	---help---
 	  This is support for a SCSI host adapter.  It is explained in section
 	  3.4 of the SCSI-HOWTO, available from
@@ -515,7 +515,7 @@ config SCSI_SATA_VITESSE
 
 config SCSI_BUSLOGIC
 	tristate "BusLogic SCSI support"
-	depends on (PCI || ISA || MCA) && SCSI && (BROKEN || !SPARC64)
+	depends on (PCI || ISA || MCA) && SCSI && ISA_DMA_API
 	---help---
 	  This is support for BusLogic MultiMaster and FlashPoint SCSI Host
 	  Adapters. Consult the SCSI-HOWTO, available from
@@ -571,7 +571,7 @@ config SCSI_DTC3280
 
 config SCSI_EATA
 	tristate "EATA ISA/EISA/PCI (DPT and generic EATA/DMA-compliant boards) support"
-	depends on (ISA || EISA || PCI) && SCSI && (BROKEN || !SPARC64)
+	depends on (ISA || EISA || PCI) && SCSI && ISA_DMA_API
 	---help---
 	  This driver supports all EATA/DMA-compliant SCSI host adapters.  DPT
 	  ISA and all EISA I/O addresses are probed looking for the "EATA"
@@ -665,7 +665,7 @@ config SCSI_FD_MCS
 
 config SCSI_GDTH
 	tristate "Intel/ICP (former GDT SCSI Disk Array) RAID Controller support"
-	depends on (ISA || EISA || PCI) && SCSI && (BROKEN || !SPARC64)
+	depends on (ISA || EISA || PCI) && SCSI && ISA_DMA_API
 	---help---
 	  Formerly called GDT SCSI Disk Array Controller Support.
 
@@ -1416,7 +1416,7 @@ config SCSI_T128
 
 config SCSI_U14_34F
 	tristate "UltraStor 14F/34F support"
-	depends on ISA && SCSI
+	depends on ISA && SCSI && ISA_DMA_API
 	---help---
 	  This is support for the UltraStor 14F and 34F SCSI-2 host adapters.
 	  The source at <file:drivers/scsi/u14-34f.c> contains some

drivers/usb/core/message.c

@@ -431,7 +431,7 @@ nomem:
  * (2) error, where io->status is a negative errno value.  The number
  *     of io->bytes transferred before the error is usually less
  *     than requested, and can be nonzero.
- * (3) cancelation, a type of error with status -ECONNRESET that
+ * (3) cancellation, a type of error with status -ECONNRESET that
  *     is initiated by usb_sg_cancel().
  *
  * When this function returns, all memory allocated through usb_sg_init() or
@@ -1282,7 +1282,7 @@ static void release_interface(struct device *dev)
  * bus rwsem; usb device driver probe() methods cannot use this routine.
  *
  * Returns zero on success, or else the status code returned by the
- * underlying call that failed.  On succesful completion, each interface
+ * underlying call that failed.  On successful completion, each interface
  * in the original device configuration has been destroyed, and each one
  * in the new configuration has been probed by all relevant usb device
  * drivers currently known to the kernel.

drivers/usb/core/urb.c

@@ -121,7 +121,7 @@ struct urb * usb_get_urb(struct urb *urb)
  * describing that request to the USB subsystem.  Request completion will
  * be indicated later, asynchronously, by calling the completion handler.
  * The three types of completion are success, error, and unlink
- * (a software-induced fault, also called "request cancelation").  
+ * (a software-induced fault, also called "request cancellation").  
  *
  * URBs may be submitted in interrupt context.
  *
@@ -170,7 +170,7 @@ struct urb * usb_get_urb(struct urb *urb)
  * As of Linux 2.6, all USB endpoint transfer queues support depths greater
  * than one.  This was previously a HCD-specific behavior, except for ISO
  * transfers.  Non-isochronous endpoint queues are inactive during cleanup
- * after faults (transfer errors or cancelation).
+ * after faults (transfer errors or cancellation).
  *
  * Reserved Bandwidth Transfers:
  *
@@ -395,7 +395,7 @@ int usb_submit_urb(struct urb *urb, int mem_flags)
  *
  * This routine cancels an in-progress request.  URBs complete only
  * once per submission, and may be canceled only once per submission.
- * Successful cancelation means the requests's completion handler will
+ * Successful cancellation means the requests's completion handler will
  * be called with a status code indicating that the request has been
  * canceled (rather than any other code) and will quickly be removed
  * from host controller data structures.

drivers/usb/gadget/ether.c

@@ -569,7 +569,7 @@ static const struct usb_cdc_ether_desc ether_desc = {
 
 /* include the status endpoint if we can, even where it's optional.
  * use wMaxPacketSize big enough to fit CDC_NOTIFY_SPEED_CHANGE in one
- * packet, to simplify cancelation; and a big transfer interval, to
+ * packet, to simplify cancellation; and a big transfer interval, to
  * waste less bandwidth.
  *
  * some drivers (like Linux 2.4 cdc-ether!) "need" it to exist even

drivers/usb/gadget/inode.c

@@ -275,7 +275,7 @@ static const char *CHIP;
  *
  * After opening, configure non-control endpoints.  Then use normal
  * stream read() and write() requests; and maybe ioctl() to get more
- * precise FIFO status when recovering from cancelation.
+ * precise FIFO status when recovering from cancellation.
  */
 
 static void epio_complete (struct usb_ep *ep, struct usb_request *req)

drivers/usb/gadget/lh7a40x_udc.c

@@ -705,7 +705,7 @@ void nuke(struct lh7a40x_ep *ep, int status)
 		done(ep, req, status);
 	}
 
-	/* Disable IRQ if EP is enabled (has decriptor) */
+	/* Disable IRQ if EP is enabled (has descriptor) */
 	if (ep->desc)
 		pio_irq_disable(ep_index(ep));
 }

drivers/usb/gadget/serial.c

@@ -240,7 +240,7 @@ struct gs_dev {
 	struct usb_ep		*dev_notify_ep;	/* address of notify endpoint */
 	struct usb_ep		*dev_in_ep;	/* address of in endpoint */
 	struct usb_ep		*dev_out_ep;	/* address of out endpoint */
-	struct usb_endpoint_descriptor		/* desciptor of notify ep */
+	struct usb_endpoint_descriptor		/* descriptor of notify ep */
 				*dev_notify_ep_desc;
 	struct usb_endpoint_descriptor		/* descriptor of in endpoint */
 				*dev_in_ep_desc;