[SPARC64]: Revamp Spitfire error trap handling.

Current uncorrectable error handling was poor enough
that the processor could just loop taking the same
trap over and over again.  Fix things up so that we
at least get a log message and perhaps even some register
state.

In the process, much consolidation became possible,
particularly with the correctable error handler.

Prefix assembler and C function names with "spitfire"
to indicate that these are for Ultra-I/II/IIi/IIe only.

More work is needed to make these routines robust and
featureful to the level of the Ultra-III error handlers.

Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc64/kernel/entry.S

@@ -21,6 +21,7 @@
 #include <asm/visasm.h>
 #include <asm/estate.h>
 #include <asm/auxio.h>
+#include <asm/sfafsr.h>
 
 #define curptr      g6
 
@@ -690,9 +691,159 @@ netbsd_syscall:
 	retl
 	 nop
 
-	.globl		__do_data_access_exception
-	.globl		__do_data_access_exception_tl1
-__do_data_access_exception_tl1:
+	/* We need to carefully read the error status, ACK
+	 * the errors, prevent recursive traps, and pass the
+	 * information on to C code for logging.
+	 *
+	 * We pass the AFAR in as-is, and we encode the status
+	 * information as described in asm-sparc64/sfafsr.h
+	 */
+	.globl		__spitfire_access_error
+__spitfire_access_error:
+	/* Disable ESTATE error reporting so that we do not
+	 * take recursive traps and RED state the processor.
+	 */
+	stxa		%g0, [%g0] ASI_ESTATE_ERROR_EN
+	membar		#Sync
+
+	mov		UDBE_UE, %g1
+	ldxa		[%g0] ASI_AFSR, %g4	! Get AFSR
+
+	/* __spitfire_cee_trap branches here with AFSR in %g4 and
+	 * UDBE_CE in %g1.  It only clears ESTATE_ERR_CE in the
+	 * ESTATE Error Enable register.
+	 */
+__spitfire_cee_trap_continue:
+	ldxa		[%g0] ASI_AFAR, %g5	! Get AFAR
+
+	rdpr		%tt, %g3
+	and		%g3, 0x1ff, %g3		! Paranoia
+	sllx		%g3, SFSTAT_TRAP_TYPE_SHIFT, %g3
+	or		%g4, %g3, %g4
+	rdpr		%tl, %g3
+	cmp		%g3, 1
+	mov		1, %g3
+	bleu		%xcc, 1f
+	 sllx		%g3, SFSTAT_TL_GT_ONE_SHIFT, %g3
+
+	or		%g4, %g3, %g4
+
+	/* Read in the UDB error register state, clearing the
+	 * sticky error bits as-needed.  We only clear them if
+	 * the UE bit is set.  Likewise, __spitfire_cee_trap
+	 * below will only do so if the CE bit is set.
+	 *
+	 * NOTE: UltraSparc-I/II have high and low UDB error
+	 *       registers, corresponding to the two UDB units
+	 *       present on those chips.  UltraSparc-IIi only
+	 *       has a single UDB, called "SDB" in the manual.
+	 *       For IIi the upper UDB register always reads
+	 *       as zero so for our purposes things will just
+	 *       work with the checks below.
+	 */
+1:	ldxa		[%g0] ASI_UDBH_ERROR_R, %g3
+	and		%g3, 0x3ff, %g7		! Paranoia
+	sllx		%g7, SFSTAT_UDBH_SHIFT, %g7
+	or		%g4, %g7, %g4
+	andcc		%g3, %g1, %g3		! UDBE_UE or UDBE_CE
+	be,pn		%xcc, 1f
+	 nop
+	stxa		%g3, [%g0] ASI_UDB_ERROR_W
+	membar		#Sync
+
+1:	mov		0x18, %g3
+	ldxa		[%g3] ASI_UDBL_ERROR_R, %g3
+	and		%g3, 0x3ff, %g7		! Paranoia
+	sllx		%g7, SFSTAT_UDBL_SHIFT, %g7
+	or		%g4, %g7, %g4
+	andcc		%g3, %g1, %g3		! UDBE_UE or UDBE_CE
+	be,pn		%xcc, 1f
+	 nop
+	mov		0x18, %g7
+	stxa		%g3, [%g7] ASI_UDB_ERROR_W
+	membar		#Sync
+
+1:	/* Ok, now that we've latched the error state,
+	 * clear the sticky bits in the AFSR.
+	 */
+	stxa		%g4, [%g0] ASI_AFSR
+	membar		#Sync
+
+	rdpr		%tl, %g2
+	cmp		%g2, 1
+	rdpr		%pil, %g2
+	bleu,pt		%xcc, 1f
+	 wrpr		%g0, 15, %pil
+
+	ba,pt		%xcc, etraptl1
+	 rd		%pc, %g7
+
+	ba,pt		%xcc, 2f
+	 nop
+
+1:	ba,pt		%xcc, etrap_irq
+	 rd		%pc, %g7
+
+2:	mov		%l4, %o1
+	mov		%l5, %o2
+	call		spitfire_access_error
+	 add		%sp, PTREGS_OFF, %o0
+	ba,pt		%xcc, rtrap
+	 clr		%l6
+
+	/* This is the trap handler entry point for ECC correctable
+	 * errors.  They are corrected, but we listen for the trap
+	 * so that the event can be logged.
+	 *
+	 * Disrupting errors are either:
+	 * 1) single-bit ECC errors during UDB reads to system
+	 *    memory
+	 * 2) data parity errors during write-back events
+	 *
+	 * As far as I can make out from the manual, the CEE trap
+	 * is only for correctable errors during memory read
+	 * accesses by the front-end of the processor.
+	 *
+	 * The code below is only for trap level 1 CEE events,
+	 * as it is the only situation where we can safely record
+	 * and log.  For trap level >1 we just clear the CE bit
+	 * in the AFSR and return.
+	 *
+	 * This is just like __spiftire_access_error above, but it
+	 * specifically handles correctable errors.  If an
+	 * uncorrectable error is indicated in the AFSR we
+	 * will branch directly above to __spitfire_access_error
+	 * to handle it instead.  Uncorrectable therefore takes
+	 * priority over correctable, and the error logging
+	 * C code will notice this case by inspecting the
+	 * trap type.
+	 */
+	.globl		__spitfire_cee_trap
+__spitfire_cee_trap:
+	ldxa		[%g0] ASI_AFSR, %g4	! Get AFSR
+	mov		1, %g3
+	sllx		%g3, SFAFSR_UE_SHIFT, %g3
+	andcc		%g4, %g3, %g0		! Check for UE
+	bne,pn		%xcc, __spitfire_access_error
+	 nop
+
+	/* Ok, in this case we only have a correctable error.
+	 * Indicate we only wish to capture that state in register
+	 * %g1, and we only disable CE error reporting unlike UE
+	 * handling which disables all errors.
+	 */
+	ldxa		[%g0] ASI_ESTATE_ERROR_EN, %g3
+	andn		%g3, ESTATE_ERR_CE, %g3
+	stxa		%g3, [%g0] ASI_ESTATE_ERROR_EN
+	membar		#Sync
+
+	/* Preserve AFSR in %g4, indicate UDB state to capture in %g1 */
+	ba,pt		%xcc, __spitfire_cee_trap_continue
+	 mov		UDBE_CE, %g1
+
+	.globl		__spitfire_data_access_exception
+	.globl		__spitfire_data_access_exception_tl1
+__spitfire_data_access_exception_tl1:
 	rdpr		%pstate, %g4
 	wrpr		%g4, PSTATE_MG|PSTATE_AG, %pstate
 	mov		TLB_SFSR, %g3
@@ -714,12 +865,12 @@ __do_data_access_exception_tl1:
 109:	 or		%g7, %lo(109b), %g7
 	mov		%l4, %o1
 	mov		%l5, %o2
-	call		data_access_exception_tl1
+	call		spitfire_data_access_exception_tl1
 	 add		%sp, PTREGS_OFF, %o0
 	ba,pt		%xcc, rtrap
 	 clr		%l6
 
-__do_data_access_exception:
+__spitfire_data_access_exception:
 	rdpr		%pstate, %g4
 	wrpr		%g4, PSTATE_MG|PSTATE_AG, %pstate
 	mov		TLB_SFSR, %g3
@@ -733,14 +884,14 @@ __do_data_access_exception:
 109:	 or		%g7, %lo(109b), %g7
 	mov		%l4, %o1
 	mov		%l5, %o2
-	call		data_access_exception
+	call		spitfire_data_access_exception
 	 add		%sp, PTREGS_OFF, %o0
 	ba,pt		%xcc, rtrap
 	 clr		%l6
 
-	.globl		__do_instruction_access_exception
-	.globl		__do_instruction_access_exception_tl1
-__do_instruction_access_exception_tl1:
+	.globl		__spitfire_insn_access_exception
+	.globl		__spitfire_insn_access_exception_tl1
+__spitfire_insn_access_exception_tl1:
 	rdpr		%pstate, %g4
 	wrpr		%g4, PSTATE_MG|PSTATE_AG, %pstate
 	mov		TLB_SFSR, %g3
@@ -753,12 +904,12 @@ __do_instruction_access_exception_tl1:
 109:	 or		%g7, %lo(109b), %g7
 	mov		%l4, %o1
 	mov		%l5, %o2
-	call		instruction_access_exception_tl1
+	call		spitfire_insn_access_exception_tl1
 	 add		%sp, PTREGS_OFF, %o0
 	ba,pt		%xcc, rtrap
 	 clr		%l6
 
-__do_instruction_access_exception:
+__spitfire_insn_access_exception:
 	rdpr		%pstate, %g4
 	wrpr		%g4, PSTATE_MG|PSTATE_AG, %pstate
 	mov		TLB_SFSR, %g3
@@ -771,102 +922,11 @@ __do_instruction_access_exception:
 109:	 or		%g7, %lo(109b), %g7
 	mov		%l4, %o1
 	mov		%l5, %o2
-	call		instruction_access_exception
+	call		spitfire_insn_access_exception
 	 add		%sp, PTREGS_OFF, %o0
 	ba,pt		%xcc, rtrap
 	 clr		%l6
 
-	/* This is the trap handler entry point for ECC correctable
-	 * errors.  They are corrected, but we listen for the trap
-	 * so that the event can be logged.
-	 *
-	 * Disrupting errors are either:
-	 * 1) single-bit ECC errors during UDB reads to system
-	 *    memory
-	 * 2) data parity errors during write-back events
-	 *
-	 * As far as I can make out from the manual, the CEE trap
-	 * is only for correctable errors during memory read
-	 * accesses by the front-end of the processor.
-	 *
-	 * The code below is only for trap level 1 CEE events,
-	 * as it is the only situation where we can safely record
-	 * and log.  For trap level >1 we just clear the CE bit
-	 * in the AFSR and return.
-	 */
-
-	/* Our trap handling infrastructure allows us to preserve
-	 * two 64-bit values during etrap for arguments to
-	 * subsequent C code.  Therefore we encode the information
-	 * as follows:
-	 *
-	 * value 1) Full 64-bits of AFAR
-	 * value 2) Low 33-bits of AFSR, then bits 33-->42
-	 *          are UDBL error status and bits 43-->52
-	 *          are UDBH error status
-	 */
-	.align	64
-	.globl	cee_trap
-cee_trap:
-	ldxa	[%g0] ASI_AFSR, %g1		! Read AFSR
-	ldxa	[%g0] ASI_AFAR, %g2		! Read AFAR
-	sllx	%g1, 31, %g1			! Clear reserved bits
-	srlx	%g1, 31, %g1			! in AFSR
-
-	/* NOTE: UltraSparc-I/II have high and low UDB error
-	 *       registers, corresponding to the two UDB units
-	 *       present on those chips.  UltraSparc-IIi only
-	 *       has a single UDB, called "SDB" in the manual.
-	 *       For IIi the upper UDB register always reads
-	 *       as zero so for our purposes things will just
-	 *       work with the checks below.
-	 */
-	ldxa	[%g0] ASI_UDBL_ERROR_R, %g3	! Read UDB-Low error status
-	andcc	%g3, (1 << 8), %g4		! Check CE bit
-	sllx	%g3, (64 - 10), %g3		! Clear reserved bits
-	srlx	%g3, (64 - 10), %g3		! in UDB-Low error status
-
-	sllx	%g3, (33 + 0), %g3		! Shift up to encoding area
-	or	%g1, %g3, %g1			! Or it in
-	be,pn	%xcc, 1f			! Branch if CE bit was clear
-	 nop
-	stxa	%g4, [%g0] ASI_UDB_ERROR_W	! Clear CE sticky bit in UDBL
-	membar	#Sync				! Synchronize ASI stores
-1:	mov	0x18, %g5			! Addr of UDB-High error status
-	ldxa	[%g5] ASI_UDBH_ERROR_R, %g3	! Read it
-
-	andcc	%g3, (1 << 8), %g4		! Check CE bit
-	sllx	%g3, (64 - 10), %g3		! Clear reserved bits
-	srlx	%g3, (64 - 10), %g3		! in UDB-High error status
-	sllx	%g3, (33 + 10), %g3		! Shift up to encoding area
-	or	%g1, %g3, %g1			! Or it in
-	be,pn	%xcc, 1f			! Branch if CE bit was clear
-	 nop
-	nop
-
-	stxa	%g4, [%g5] ASI_UDB_ERROR_W	! Clear CE sticky bit in UDBH
-	membar	#Sync				! Synchronize ASI stores
-1:	mov	1, %g5				! AFSR CE bit is
-	sllx	%g5, 20, %g5			! bit 20
-	stxa	%g5, [%g0] ASI_AFSR		! Clear CE sticky bit in AFSR
-	membar	#Sync				! Synchronize ASI stores
-	sllx	%g2, (64 - 41), %g2		! Clear reserved bits
-	srlx	%g2, (64 - 41), %g2		! in latched AFAR
-
-	andn	%g2, 0x0f, %g2			! Finish resv bit clearing
-	mov	%g1, %g4			! Move AFSR+UDB* into save reg
-	mov	%g2, %g5			! Move AFAR into save reg
-	rdpr	%pil, %g2
-	wrpr	%g0, 15, %pil
-	ba,pt	%xcc, etrap_irq
-	 rd	%pc, %g7
-	mov	%l4, %o0
-
-	mov	%l5, %o1
-	call	cee_log
-	 add	%sp, PTREGS_OFF, %o2
-	ba,a,pt	%xcc, rtrap_irq
-
 	/* Capture I/D/E-cache state into per-cpu error scoreboard.
 	 *
 	 * %g1:		(TL>=0) ? 1 : 0

arch/sparc64/kernel/traps.c

@@ -33,6 +33,7 @@
 #include <asm/dcu.h>
 #include <asm/estate.h>
 #include <asm/chafsr.h>
+#include <asm/sfafsr.h>
 #include <asm/psrcompat.h>
 #include <asm/processor.h>
 #include <asm/timer.h>
@@ -143,8 +144,7 @@ void do_BUG(const char *file, int line)
 }
 #endif
 
-void instruction_access_exception(struct pt_regs *regs,
-				  unsigned long sfsr, unsigned long sfar)
+void spitfire_insn_access_exception(struct pt_regs *regs, unsigned long sfsr, unsigned long sfar)
 {
 	siginfo_t info;
 
@@ -153,8 +153,8 @@ void instruction_access_exception(struct pt_regs *regs,
 		return;
 
 	if (regs->tstate & TSTATE_PRIV) {
-		printk("instruction_access_exception: SFSR[%016lx] SFAR[%016lx], going.\n",
-		       sfsr, sfar);
+		printk("spitfire_insn_access_exception: SFSR[%016lx] "
+		       "SFAR[%016lx], going.\n", sfsr, sfar);
 		die_if_kernel("Iax", regs);
 	}
 	if (test_thread_flag(TIF_32BIT)) {
@@ -169,19 +169,17 @@ void instruction_access_exception(struct pt_regs *regs,
 	force_sig_info(SIGSEGV, &info, current);
 }
 
-void instruction_access_exception_tl1(struct pt_regs *regs,
-				      unsigned long sfsr, unsigned long sfar)
+void spitfire_insn_access_exception_tl1(struct pt_regs *regs, unsigned long sfsr, unsigned long sfar)
 {
 	if (notify_die(DIE_TRAP_TL1, "instruction access exception tl1", regs,
 		       0, 0x8, SIGTRAP) == NOTIFY_STOP)
 		return;
 
 	dump_tl1_traplog((struct tl1_traplog *)(regs + 1));
-	instruction_access_exception(regs, sfsr, sfar);
+	spitfire_insn_access_exception(regs, sfsr, sfar);
 }
 
-void data_access_exception(struct pt_regs *regs,
-			   unsigned long sfsr, unsigned long sfar)
+void spitfire_data_access_exception(struct pt_regs *regs, unsigned long sfsr, unsigned long sfar)
 {
 	siginfo_t info;
 
@@ -207,8 +205,8 @@ void data_access_exception(struct pt_regs *regs,
 			return;
 		}
 		/* Shit... */
-		printk("data_access_exception: SFSR[%016lx] SFAR[%016lx], going.\n",
-		       sfsr, sfar);
+		printk("spitfire_data_access_exception: SFSR[%016lx] "
+		       "SFAR[%016lx], going.\n", sfsr, sfar);
 		die_if_kernel("Dax", regs);
 	}
 
@@ -220,15 +218,14 @@ void data_access_exception(struct pt_regs *regs,
 	force_sig_info(SIGSEGV, &info, current);
 }
 
-void data_access_exception_tl1(struct pt_regs *regs,
-			       unsigned long sfsr, unsigned long sfar)
+void spitfire_data_access_exception_tl1(struct pt_regs *regs, unsigned long sfsr, unsigned long sfar)
 {
 	if (notify_die(DIE_TRAP_TL1, "data access exception tl1", regs,
 		       0, 0x30, SIGTRAP) == NOTIFY_STOP)
 		return;
 
 	dump_tl1_traplog((struct tl1_traplog *)(regs + 1));
-	data_access_exception(regs, sfsr, sfar);
+	spitfire_data_access_exception(regs, sfsr, sfar);
 }
 
 #ifdef CONFIG_PCI
@@ -264,54 +261,13 @@ static void spitfire_clean_and_reenable_l1_caches(void)
 			     : "memory");
 }
 
-void do_iae(struct pt_regs *regs)
+static void spitfire_enable_estate_errors(void)
 {
-	siginfo_t info;
-
-	spitfire_clean_and_reenable_l1_caches();
-
-	if (notify_die(DIE_TRAP, "instruction access exception", regs,
-		       0, 0x8, SIGTRAP) == NOTIFY_STOP)
-		return;
-
-	info.si_signo = SIGBUS;
-	info.si_errno = 0;
-	info.si_code = BUS_OBJERR;
-	info.si_addr = (void *)0;
-	info.si_trapno = 0;
-	force_sig_info(SIGBUS, &info, current);
-}
-
-void do_dae(struct pt_regs *regs)
-{
-	siginfo_t info;
-
-#ifdef CONFIG_PCI
-	if (pci_poke_in_progress && pci_poke_cpu == smp_processor_id()) {
-		spitfire_clean_and_reenable_l1_caches();
-
-		pci_poke_faulted = 1;
-
-		/* Why the fuck did they have to change this? */
-		if (tlb_type == cheetah || tlb_type == cheetah_plus)
-			regs->tpc += 4;
-
-		regs->tnpc = regs->tpc + 4;
-		return;
-	}
-#endif
-	spitfire_clean_and_reenable_l1_caches();
-
-	if (notify_die(DIE_TRAP, "data access exception", regs,
-		       0, 0x30, SIGTRAP) == NOTIFY_STOP)
-		return;
-
-	info.si_signo = SIGBUS;
-	info.si_errno = 0;
-	info.si_code = BUS_OBJERR;
-	info.si_addr = (void *)0;
-	info.si_trapno = 0;
-	force_sig_info(SIGBUS, &info, current);
+	__asm__ __volatile__("stxa	%0, [%%g0] %1\n\t"
+			     "membar	#Sync"
+			     : /* no outputs */
+			     : "r" (ESTATE_ERR_ALL),
+			       "i" (ASI_ESTATE_ERROR_EN));
 }
 
 static char ecc_syndrome_table[] = {
@@ -349,65 +305,15 @@ static char ecc_syndrome_table[] = {
 	0x0b, 0x48, 0x48, 0x4b, 0x48, 0x4b, 0x4b, 0x4a
 };
 
-/* cee_trap in entry.S encodes AFSR/UDBH/UDBL error status
- * in the following format.  The AFAR is left as is, with
- * reserved bits cleared, and is a raw 40-bit physical
- * address.
- */
-#define CE_STATUS_UDBH_UE		(1UL << (43 + 9))
-#define CE_STATUS_UDBH_CE		(1UL << (43 + 8))
-#define CE_STATUS_UDBH_ESYNDR		(0xffUL << 43)
-#define CE_STATUS_UDBH_SHIFT		43
-#define CE_STATUS_UDBL_UE		(1UL << (33 + 9))
-#define CE_STATUS_UDBL_CE		(1UL << (33 + 8))
-#define CE_STATUS_UDBL_ESYNDR		(0xffUL << 33)
-#define CE_STATUS_UDBL_SHIFT		33
-#define CE_STATUS_AFSR_MASK		(0x1ffffffffUL)
-#define CE_STATUS_AFSR_ME		(1UL << 32)
-#define CE_STATUS_AFSR_PRIV		(1UL << 31)
-#define CE_STATUS_AFSR_ISAP		(1UL << 30)
-#define CE_STATUS_AFSR_ETP		(1UL << 29)
-#define CE_STATUS_AFSR_IVUE		(1UL << 28)
-#define CE_STATUS_AFSR_TO		(1UL << 27)
-#define CE_STATUS_AFSR_BERR		(1UL << 26)
-#define CE_STATUS_AFSR_LDP		(1UL << 25)
-#define CE_STATUS_AFSR_CP		(1UL << 24)
-#define CE_STATUS_AFSR_WP		(1UL << 23)
-#define CE_STATUS_AFSR_EDP		(1UL << 22)
-#define CE_STATUS_AFSR_UE		(1UL << 21)
-#define CE_STATUS_AFSR_CE		(1UL << 20)
-#define CE_STATUS_AFSR_ETS		(0xfUL << 16)
-#define CE_STATUS_AFSR_ETS_SHIFT	16
-#define CE_STATUS_AFSR_PSYND		(0xffffUL << 0)
-#define CE_STATUS_AFSR_PSYND_SHIFT	0
-
-/* Layout of Ecache TAG Parity Syndrome of AFSR */
-#define AFSR_ETSYNDROME_7_0		0x1UL /* E$-tag bus bits  <7:0> */
-#define AFSR_ETSYNDROME_15_8		0x2UL /* E$-tag bus bits <15:8> */
-#define AFSR_ETSYNDROME_21_16		0x4UL /* E$-tag bus bits <21:16> */
-#define AFSR_ETSYNDROME_24_22		0x8UL /* E$-tag bus bits <24:22> */
-
 static char *syndrome_unknown = "<Unknown>";
 
-asmlinkage void cee_log(unsigned long ce_status,
-			unsigned long afar,
-			struct pt_regs *regs)
+static void spitfire_log_udb_syndrome(unsigned long afar, unsigned long udbh, unsigned long udbl, unsigned long bit)
 {
-	char memmod_str[64];
-	char *p;
-	unsigned short scode, udb_reg;
+	unsigned short scode;
+	char memmod_str[64], *p;
 
-	printk(KERN_WARNING "CPU[%d]: Correctable ECC Error "
-	       "AFSR[%lx] AFAR[%016lx] UDBL[%lx] UDBH[%lx]\n",
-	       smp_processor_id(),
-	       (ce_status & CE_STATUS_AFSR_MASK),
-	       afar,
-	       ((ce_status >> CE_STATUS_UDBL_SHIFT) & 0x3ffUL),
-	       ((ce_status >> CE_STATUS_UDBH_SHIFT) & 0x3ffUL));
-
-	udb_reg = ((ce_status >> CE_STATUS_UDBL_SHIFT) & 0x3ffUL);
-	if (udb_reg & (1 << 8)) {
-		scode = ecc_syndrome_table[udb_reg & 0xff];
+	if (udbl & bit) {
+		scode = ecc_syndrome_table[udbl & 0xff];
 		if (prom_getunumber(scode, afar,
 				    memmod_str, sizeof(memmod_str)) == -1)
 			p = syndrome_unknown;
@@ -418,9 +324,8 @@ asmlinkage void cee_log(unsigned long ce_status,
 		       smp_processor_id(), scode, p);
 	}
 
-	udb_reg = ((ce_status >> CE_STATUS_UDBH_SHIFT) & 0x3ffUL);
-	if (udb_reg & (1 << 8)) {
-		scode = ecc_syndrome_table[udb_reg & 0xff];
+	if (udbh & bit) {
+		scode = ecc_syndrome_table[udbh & 0xff];
 		if (prom_getunumber(scode, afar,
 				    memmod_str, sizeof(memmod_str)) == -1)
 			p = syndrome_unknown;
@@ -430,6 +335,127 @@ asmlinkage void cee_log(unsigned long ce_status,
 		       "Memory Module \"%s\"\n",
 		       smp_processor_id(), scode, p);
 	}
+
+}
+
+static void spitfire_cee_log(unsigned long afsr, unsigned long afar, unsigned long udbh, unsigned long udbl, int tl1, struct pt_regs *regs)
+{
+
+	printk(KERN_WARNING "CPU[%d]: Correctable ECC Error "
+	       "AFSR[%lx] AFAR[%016lx] UDBL[%lx] UDBH[%lx] TL>1[%d]\n",
+	       smp_processor_id(), afsr, afar, udbl, udbh, tl1);
+
+	spitfire_log_udb_syndrome(afar, udbh, udbl, UDBE_CE);
+
+	/* We always log it, even if someone is listening for this
+	 * trap.
+	 */
+	notify_die(DIE_TRAP, "Correctable ECC Error", regs,
+		   0, TRAP_TYPE_CEE, SIGTRAP);
+
+	/* The Correctable ECC Error trap does not disable I/D caches.  So
+	 * we only have to restore the ESTATE Error Enable register.
+	 */
+	spitfire_enable_estate_errors();
+}
+
+static void spitfire_ue_log(unsigned long afsr, unsigned long afar, unsigned long udbh, unsigned long udbl, unsigned long tt, int tl1, struct pt_regs *regs)
+{
+	siginfo_t info;
+
+	printk(KERN_WARNING "CPU[%d]: Uncorrectable Error AFSR[%lx] "
+	       "AFAR[%lx] UDBL[%lx] UDBH[%ld] TT[%lx] TL>1[%d]\n",
+	       smp_processor_id(), afsr, afar, udbl, udbh, tt, tl1);
+
+	/* XXX add more human friendly logging of the error status
+	 * XXX as is implemented for cheetah
+	 */
+
+	spitfire_log_udb_syndrome(afar, udbh, udbl, UDBE_UE);
+
+	/* We always log it, even if someone is listening for this
+	 * trap.
+	 */
+	notify_die(DIE_TRAP, "Uncorrectable Error", regs,
+		   0, tt, SIGTRAP);
+
+	if (regs->tstate & TSTATE_PRIV) {
+		if (tl1)
+			dump_tl1_traplog((struct tl1_traplog *)(regs + 1));
+		die_if_kernel("UE", regs);
+	}
+
+	/* XXX need more intelligent processing here, such as is implemented
+	 * XXX for cheetah errors, in fact if the E-cache still holds the
+	 * XXX line with bad parity this will loop
+	 */
+
+	spitfire_clean_and_reenable_l1_caches();
+	spitfire_enable_estate_errors();
+
+	if (test_thread_flag(TIF_32BIT)) {
+		regs->tpc &= 0xffffffff;
+		regs->tnpc &= 0xffffffff;
+	}
+	info.si_signo = SIGBUS;
+	info.si_errno = 0;
+	info.si_code = BUS_OBJERR;
+	info.si_addr = (void *)0;
+	info.si_trapno = 0;
+	force_sig_info(SIGBUS, &info, current);
+}
+
+void spitfire_access_error(struct pt_regs *regs, unsigned long status_encoded, unsigned long afar)
+{
+	unsigned long afsr, tt, udbh, udbl;
+	int tl1;
+
+	afsr = (status_encoded & SFSTAT_AFSR_MASK) >> SFSTAT_AFSR_SHIFT;
+	tt = (status_encoded & SFSTAT_TRAP_TYPE) >> SFSTAT_TRAP_TYPE_SHIFT;
+	tl1 = (status_encoded & SFSTAT_TL_GT_ONE) ? 1 : 0;
+	udbl = (status_encoded & SFSTAT_UDBL_MASK) >> SFSTAT_UDBL_SHIFT;
+	udbh = (status_encoded & SFSTAT_UDBH_MASK) >> SFSTAT_UDBH_SHIFT;
+
+#ifdef CONFIG_PCI
+	if (tt == TRAP_TYPE_DAE &&
+	    pci_poke_in_progress && pci_poke_cpu == smp_processor_id()) {
+		spitfire_clean_and_reenable_l1_caches();
+		spitfire_enable_estate_errors();
+
+		pci_poke_faulted = 1;
+		regs->tnpc = regs->tpc + 4;
+		return;
+	}
+#endif
+
+	if (afsr & SFAFSR_UE)
+		spitfire_ue_log(afsr, afar, udbh, udbl, tt, tl1, regs);
+
+	if (tt == TRAP_TYPE_CEE) {
+		/* Handle the case where we took a CEE trap, but ACK'd
+		 * only the UE state in the UDB error registers.
+		 */
+		if (afsr & SFAFSR_UE) {
+			if (udbh & UDBE_CE) {
+				__asm__ __volatile__(
+					"stxa	%0, [%1] %2\n\t"
+					"membar	#Sync"
+					: /* no outputs */
+					: "r" (udbh & UDBE_CE),
+					  "r" (0x0), "i" (ASI_UDB_ERROR_W));
+			}
+			if (udbl & UDBE_CE) {
+				__asm__ __volatile__(
+					"stxa	%0, [%1] %2\n\t"
+					"membar	#Sync"
+					: /* no outputs */
+					: "r" (udbl & UDBE_CE),
+					  "r" (0x18), "i" (ASI_UDB_ERROR_W));
+			}
+		}
+
+		spitfire_cee_log(afsr, afar, udbh, udbl, tl1, regs);
+	}
 }
 
 int cheetah_pcache_forced_on;

arch/sparc64/kernel/ttable.S

@@ -18,9 +18,10 @@ sparc64_ttable_tl0:
 tl0_resv000:	BOOT_KERNEL BTRAP(0x1) BTRAP(0x2) BTRAP(0x3)
 tl0_resv004:	BTRAP(0x4)  BTRAP(0x5) BTRAP(0x6) BTRAP(0x7)
 tl0_iax:	membar #Sync
-		TRAP_NOSAVE_7INSNS(__do_instruction_access_exception)
+		TRAP_NOSAVE_7INSNS(__spitfire_insn_access_exception)
 tl0_resv009:	BTRAP(0x9)
-tl0_iae:	TRAP(do_iae)
+tl0_iae:	membar #Sync
+		TRAP_NOSAVE_7INSNS(__spitfire_access_error)
 tl0_resv00b:	BTRAP(0xb) BTRAP(0xc) BTRAP(0xd) BTRAP(0xe) BTRAP(0xf)
 tl0_ill:	membar #Sync
 		TRAP_7INSNS(do_illegal_instruction)
@@ -36,9 +37,10 @@ tl0_cwin:	CLEAN_WINDOW
 tl0_div0:	TRAP(do_div0)
 tl0_resv029:	BTRAP(0x29) BTRAP(0x2a) BTRAP(0x2b) BTRAP(0x2c) BTRAP(0x2d) BTRAP(0x2e)
 tl0_resv02f:	BTRAP(0x2f)
-tl0_dax:	TRAP_NOSAVE(__do_data_access_exception)
+tl0_dax:	TRAP_NOSAVE(__spitfire_data_access_exception)
 tl0_resv031:	BTRAP(0x31)
-tl0_dae:	TRAP(do_dae)
+tl0_dae:	membar #Sync
+		TRAP_NOSAVE_7INSNS(__spitfire_access_error)
 tl0_resv033:	BTRAP(0x33)
 tl0_mna:	TRAP_NOSAVE(do_mna)
 tl0_lddfmna:	TRAP_NOSAVE(do_lddfmna)
@@ -73,7 +75,8 @@ tl0_resv05c:	BTRAP(0x5c) BTRAP(0x5d) BTRAP(0x5e) BTRAP(0x5f)
 tl0_ivec:	TRAP_IVEC
 tl0_paw:	TRAP(do_paw)
 tl0_vaw:	TRAP(do_vaw)
-tl0_cee:	TRAP_NOSAVE(cee_trap)
+tl0_cee:	membar #Sync
+		TRAP_NOSAVE_7INSNS(__spitfire_cee_trap)
 tl0_iamiss:
 #include	"itlb_base.S"
 tl0_damiss:
@@ -175,9 +178,10 @@ tl0_resv1f0:	BTRAPS(0x1f0) BTRAPS(0x1f8)
 sparc64_ttable_tl1:
 tl1_resv000:	BOOT_KERNEL    BTRAPTL1(0x1) BTRAPTL1(0x2) BTRAPTL1(0x3)
 tl1_resv004:	BTRAPTL1(0x4)  BTRAPTL1(0x5) BTRAPTL1(0x6) BTRAPTL1(0x7)
-tl1_iax:	TRAP_NOSAVE(__do_instruction_access_exception_tl1)
+tl1_iax:	TRAP_NOSAVE(__spitfire_insn_access_exception_tl1)
 tl1_resv009:	BTRAPTL1(0x9)
-tl1_iae:	TRAPTL1(do_iae_tl1)
+tl1_iae:	membar #Sync
+		TRAP_NOSAVE_7INSNS(__spitfire_access_error)
 tl1_resv00b:	BTRAPTL1(0xb) BTRAPTL1(0xc) BTRAPTL1(0xd) BTRAPTL1(0xe) BTRAPTL1(0xf)
 tl1_ill:	TRAPTL1(do_ill_tl1)
 tl1_privop:	BTRAPTL1(0x11)
@@ -193,9 +197,10 @@ tl1_cwin:	CLEAN_WINDOW
 tl1_div0:	TRAPTL1(do_div0_tl1)
 tl1_resv029:	BTRAPTL1(0x29) BTRAPTL1(0x2a) BTRAPTL1(0x2b) BTRAPTL1(0x2c)
 tl1_resv02d:	BTRAPTL1(0x2d) BTRAPTL1(0x2e) BTRAPTL1(0x2f)
-tl1_dax:	TRAP_NOSAVE(__do_data_access_exception_tl1)
+tl1_dax:	TRAP_NOSAVE(__spitfire_data_access_exception_tl1)
 tl1_resv031:	BTRAPTL1(0x31)
-tl1_dae:	TRAPTL1(do_dae_tl1)
+tl1_dae:	membar #Sync
+		TRAP_NOSAVE_7INSNS(__spitfire_access_error)
 tl1_resv033:	BTRAPTL1(0x33)
 tl1_mna:	TRAP_NOSAVE(do_mna)
 tl1_lddfmna:	TRAPTL1(do_lddfmna_tl1)
@@ -219,8 +224,8 @@ tl1_paw:	TRAPTL1(do_paw_tl1)
 tl1_vaw:	TRAPTL1(do_vaw_tl1)
 
 		/* The grotty trick to save %g1 into current->thread.cee_stuff
-		 * is because when we take this trap we could be interrupting trap
-		 * code already using the trap alternate global registers.
+		 * is because when we take this trap we could be interrupting
+		 * trap code already using the trap alternate global registers.
 		 *
 		 * We cross our fingers and pray that this store/load does
 		 * not cause yet another CEE trap.

arch/sparc64/kernel/unaligned.c

@@ -349,9 +349,9 @@ int handle_popc(u32 insn, struct pt_regs *regs)
 
 extern void do_fpother(struct pt_regs *regs);
 extern void do_privact(struct pt_regs *regs);
-extern void data_access_exception(struct pt_regs *regs,
-				  unsigned long sfsr,
-				  unsigned long sfar);
+extern void spitfire_data_access_exception(struct pt_regs *regs,
+					   unsigned long sfsr,
+					   unsigned long sfar);
 
 int handle_ldf_stq(u32 insn, struct pt_regs *regs)
 {
@@ -394,14 +394,14 @@ int handle_ldf_stq(u32 insn, struct pt_regs *regs)
 				break;
 			}
 		default:
-			data_access_exception(regs, 0, addr);
+			spitfire_data_access_exception(regs, 0, addr);
 			return 1;
 		}
 		if (put_user (first >> 32, (u32 __user *)addr) ||
 		    __put_user ((u32)first, (u32 __user *)(addr + 4)) ||
 		    __put_user (second >> 32, (u32 __user *)(addr + 8)) ||
 		    __put_user ((u32)second, (u32 __user *)(addr + 12))) {
-		    	data_access_exception(regs, 0, addr);
+		    	spitfire_data_access_exception(regs, 0, addr);
 		    	return 1;
 		}
 	} else {
@@ -414,7 +414,7 @@ int handle_ldf_stq(u32 insn, struct pt_regs *regs)
 			do_privact(regs);
 			return 1;
 		} else if (asi > ASI_SNFL) {
-			data_access_exception(regs, 0, addr);
+			spitfire_data_access_exception(regs, 0, addr);
 			return 1;
 		}
 		switch (insn & 0x180000) {
@@ -431,7 +431,7 @@ int handle_ldf_stq(u32 insn, struct pt_regs *regs)
 				err |= __get_user (data[i], (u32 __user *)(addr + 4*i));
 		}
 		if (err && !(asi & 0x2 /* NF */)) {
-			data_access_exception(regs, 0, addr);
+			spitfire_data_access_exception(regs, 0, addr);
 			return 1;
 		}
 		if (asi & 0x8) /* Little */ {
@@ -534,7 +534,7 @@ void handle_lddfmna(struct pt_regs *regs, unsigned long sfar, unsigned long sfsr
 		*(u64 *)(f->regs + freg) = value;
 		current_thread_info()->fpsaved[0] |= flag;
 	} else {
-daex:		data_access_exception(regs, sfsr, sfar);
+daex:		spitfire_data_access_exception(regs, sfsr, sfar);
 		return;
 	}
 	advance(regs);
@@ -578,7 +578,7 @@ void handle_stdfmna(struct pt_regs *regs, unsigned long sfar, unsigned long sfsr
 		    __put_user ((u32)value, (u32 __user *)(sfar + 4)))
 			goto daex;
 	} else {
-daex:		data_access_exception(regs, sfsr, sfar);
+daex:		spitfire_data_access_exception(regs, sfsr, sfar);
 		return;
 	}
 	advance(regs);

arch/sparc64/kernel/winfixup.S

@@ -318,7 +318,7 @@ fill_fixup_dax:
 	 nop
 	rdpr		%pstate, %l1			! Prepare to change globals.
 	mov		%g4, %o1			! Setup args for
-	mov		%g5, %o2			! final call to data_access_exception.
+	mov		%g5, %o2			! final call to spitfire_data_access_exception.
 	andn		%l1, PSTATE_MM, %l1		! We want to be in RMO
 
 	mov		%g6, %o7			! Stash away current.
@@ -330,7 +330,7 @@ fill_fixup_dax:
 	mov		TSB_REG, %g1
 	ldxa		[%g1] ASI_IMMU, %g5
 #endif
-	call		data_access_exception
+	call		spitfire_data_access_exception
 	 add		%sp, PTREGS_OFF, %o0
 
 	b,pt		%xcc, rtrap
@@ -391,7 +391,7 @@ window_dax_from_user_common:
 109:	 or		%g7, %lo(109b), %g7
 	mov		%l4, %o1
 	mov		%l5, %o2
-	call		data_access_exception
+	call		spitfire_data_access_exception
 	 add		%sp, PTREGS_OFF, %o0
 	ba,pt		%xcc, rtrap
 	 clr		%l6

include/asm-sparc64/sfafsr.h

@@ -0,0 +1,82 @@
+#ifndef _SPARC64_SFAFSR_H
+#define _SPARC64_SFAFSR_H
+
+#include <asm/const.h>
+
+/* Spitfire Asynchronous Fault Status register, ASI=0x4C VA<63:0>=0x0 */
+
+#define SFAFSR_ME		(_AC(1,UL) << SFAFSR_ME_SHIFT)
+#define SFAFSR_ME_SHIFT		32
+#define SFAFSR_PRIV		(_AC(1,UL) << SFAFSR_PRIV_SHIFT)
+#define SFAFSR_PRIV_SHIFT	31
+#define SFAFSR_ISAP		(_AC(1,UL) << SFAFSR_ISAP_SHIFT)
+#define SFAFSR_ISAP_SHIFT	30
+#define SFAFSR_ETP		(_AC(1,UL) << SFAFSR_ETP_SHIFT)
+#define SFAFSR_ETP_SHIFT	29
+#define SFAFSR_IVUE		(_AC(1,UL) << SFAFSR_IVUE_SHIFT)
+#define SFAFSR_IVUE_SHIFT	28
+#define SFAFSR_TO		(_AC(1,UL) << SFAFSR_TO_SHIFT)
+#define SFAFSR_TO_SHIFT		27
+#define SFAFSR_BERR		(_AC(1,UL) << SFAFSR_BERR_SHIFT)
+#define SFAFSR_BERR_SHIFT	26
+#define SFAFSR_LDP		(_AC(1,UL) << SFAFSR_LDP_SHIFT)
+#define SFAFSR_LDP_SHIFT	25
+#define SFAFSR_CP		(_AC(1,UL) << SFAFSR_CP_SHIFT)
+#define SFAFSR_CP_SHIFT		24
+#define SFAFSR_WP		(_AC(1,UL) << SFAFSR_WP_SHIFT)
+#define SFAFSR_WP_SHIFT		23
+#define SFAFSR_EDP		(_AC(1,UL) << SFAFSR_EDP_SHIFT)
+#define SFAFSR_EDP_SHIFT	22
+#define SFAFSR_UE		(_AC(1,UL) << SFAFSR_UE_SHIFT)
+#define SFAFSR_UE_SHIFT		21
+#define SFAFSR_CE		(_AC(1,UL) << SFAFSR_CE_SHIFT)
+#define SFAFSR_CE_SHIFT		20
+#define SFAFSR_ETS		(_AC(0xf,UL) << SFAFSR_ETS_SHIFT)
+#define SFAFSR_ETS_SHIFT	16
+#define SFAFSR_PSYND		(_AC(0xffff,UL) << SFAFSR_PSYND_SHIFT)
+#define SFAFSR_PSYND_SHIFT	0
+
+/* UDB Error Register, ASI=0x7f VA<63:0>=0x0(High),0x18(Low) for read
+ *                     ASI=0x77 VA<63:0>=0x0(High),0x18(Low) for write
+ */
+
+#define UDBE_UE			(_AC(1,UL) << 9)
+#define UDBE_CE			(_AC(1,UL) << 8)
+#define UDBE_E_SYNDR		(_AC(0xff,UL) << 0)
+
+/* The trap handlers for asynchronous errors encode the AFSR and
+ * other pieces of information into a 64-bit argument for C code
+ * encoded as follows:
+ *
+ * -----------------------------------------------
+ * |  UDB_H  |  UDB_L  | TL>1  |  TT  |   AFSR   |
+ * -----------------------------------------------
+ *  63     54 53     44    42   41  33 32       0
+ *
+ * The AFAR is passed in unchanged.
+ */
+#define SFSTAT_UDBH_MASK	(_AC(0x3ff,UL) << SFSTAT_UDBH_SHIFT)
+#define SFSTAT_UDBH_SHIFT	54
+#define SFSTAT_UDBL_MASK	(_AC(0x3ff,UL) << SFSTAT_UDBH_SHIFT)
+#define SFSTAT_UDBL_SHIFT	44
+#define SFSTAT_TL_GT_ONE	(_AC(1,UL) << SFSTAT_TL_GT_ONE_SHIFT)
+#define SFSTAT_TL_GT_ONE_SHIFT	42
+#define SFSTAT_TRAP_TYPE	(_AC(0x1FF,UL) << SFSTAT_TRAP_TYPE_SHIFT)
+#define SFSTAT_TRAP_TYPE_SHIFT	33
+#define SFSTAT_AFSR_MASK	(_AC(0x1ffffffff,UL) << SFSTAT_AFSR_SHIFT)
+#define SFSTAT_AFSR_SHIFT	0
+
+/* ESTATE Error Enable Register, ASI=0x4b VA<63:0>=0x0 */
+#define ESTATE_ERR_CE		0x1 /* Correctable errors                    */
+#define ESTATE_ERR_NCE		0x2 /* TO, BERR, LDP, ETP, EDP, WP, UE, IVUE */
+#define ESTATE_ERR_ISAP		0x4 /* System address parity error           */
+#define ESTATE_ERR_ALL		(ESTATE_ERR_CE | \
+				 ESTATE_ERR_NCE | \
+				 ESTATE_ERR_ISAP)
+
+/* The various trap types that report using the above state. */
+#define TRAP_TYPE_IAE		0x09 /* Instruction Access Error             */
+#define TRAP_TYPE_DAE		0x32 /* Data Access Error                    */
+#define TRAP_TYPE_CEE		0x63 /* Correctable ECC Error                */
+
+#endif /* _SPARC64_SFAFSR_H */