Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 241 insertions, 0 deletions

diff --git a/arch/sparc/kernel/spiterrs.S b/arch/sparc/kernel/spiterrs.S
new file mode 100644
index 000000000..5427af440
--- /dev/null
+++ b/arch/sparc/kernel/spiterrs.S
@@ -0,0 +1,241 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+	/* 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
+	 */
+	.type		__spitfire_access_error,#function
+__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, PIL_NORMAL_MAX, %pil
+
+	ba,pt		%xcc, etraptl1
+	 rd		%pc, %g7
+
+	ba,a,pt		%xcc, 2f
+	 nop
+
+1:	ba,pt		%xcc, etrap_irq
+	 rd		%pc, %g7
+
+2:
+#ifdef CONFIG_TRACE_IRQFLAGS
+	call	trace_hardirqs_off
+	 nop
+#endif
+	mov		%l4, %o1
+	mov		%l5, %o2
+	call		spitfire_access_error
+	 add		%sp, PTREGS_OFF, %o0
+	ba,a,pt		%xcc, rtrap
+	.size		__spitfire_access_error,.-__spitfire_access_error
+
+	/* 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.
+	 */
+	.type		__spitfire_cee_trap,#function
+__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
+	.size		__spitfire_cee_trap,.-__spitfire_cee_trap
+
+	.type		__spitfire_data_access_exception_tl1,#function
+__spitfire_data_access_exception_tl1:
+	rdpr		%pstate, %g4
+	wrpr		%g4, PSTATE_MG|PSTATE_AG, %pstate
+	mov		TLB_SFSR, %g3
+	mov		DMMU_SFAR, %g5
+	ldxa		[%g3] ASI_DMMU, %g4	! Get SFSR
+	ldxa		[%g5] ASI_DMMU, %g5	! Get SFAR
+	stxa		%g0, [%g3] ASI_DMMU	! Clear SFSR.FaultValid bit
+	membar		#Sync
+	rdpr		%tt, %g3
+	cmp		%g3, 0x80		! first win spill/fill trap
+	blu,pn		%xcc, 1f
+	 cmp		%g3, 0xff		! last win spill/fill trap
+	bgu,pn		%xcc, 1f
+	 nop
+	ba,pt		%xcc, winfix_dax
+	 rdpr		%tpc, %g3
+1:	sethi		%hi(109f), %g7
+	ba,pt		%xcc, etraptl1
+109:	 or		%g7, %lo(109b), %g7
+	mov		%l4, %o1
+	mov		%l5, %o2
+	call		spitfire_data_access_exception_tl1
+	 add		%sp, PTREGS_OFF, %o0
+	ba,a,pt		%xcc, rtrap
+	.size		__spitfire_data_access_exception_tl1,.-__spitfire_data_access_exception_tl1
+
+	.type		__spitfire_data_access_exception,#function
+__spitfire_data_access_exception:
+	rdpr		%pstate, %g4
+	wrpr		%g4, PSTATE_MG|PSTATE_AG, %pstate
+	mov		TLB_SFSR, %g3
+	mov		DMMU_SFAR, %g5
+	ldxa		[%g3] ASI_DMMU, %g4	! Get SFSR
+	ldxa		[%g5] ASI_DMMU, %g5	! Get SFAR
+	stxa		%g0, [%g3] ASI_DMMU	! Clear SFSR.FaultValid bit
+	membar		#Sync
+	sethi		%hi(109f), %g7
+	ba,pt		%xcc, etrap
+109:	 or		%g7, %lo(109b), %g7
+	mov		%l4, %o1
+	mov		%l5, %o2
+	call		spitfire_data_access_exception
+	 add		%sp, PTREGS_OFF, %o0
+	ba,a,pt		%xcc, rtrap
+	.size		__spitfire_data_access_exception,.-__spitfire_data_access_exception
+
+	.type		__spitfire_insn_access_exception_tl1,#function
+__spitfire_insn_access_exception_tl1:
+	rdpr		%pstate, %g4
+	wrpr		%g4, PSTATE_MG|PSTATE_AG, %pstate
+	mov		TLB_SFSR, %g3
+	ldxa		[%g3] ASI_IMMU, %g4	! Get SFSR
+	rdpr		%tpc, %g5		! IMMU has no SFAR, use TPC
+	stxa		%g0, [%g3] ASI_IMMU	! Clear FaultValid bit
+	membar		#Sync
+	sethi		%hi(109f), %g7
+	ba,pt		%xcc, etraptl1
+109:	 or		%g7, %lo(109b), %g7
+	mov		%l4, %o1
+	mov		%l5, %o2
+	call		spitfire_insn_access_exception_tl1
+	 add		%sp, PTREGS_OFF, %o0
+	ba,a,pt		%xcc, rtrap
+	.size		__spitfire_insn_access_exception_tl1,.-__spitfire_insn_access_exception_tl1
+
+	.type		__spitfire_insn_access_exception,#function
+__spitfire_insn_access_exception:
+	rdpr		%pstate, %g4
+	wrpr		%g4, PSTATE_MG|PSTATE_AG, %pstate
+	mov		TLB_SFSR, %g3
+	ldxa		[%g3] ASI_IMMU, %g4	! Get SFSR
+	rdpr		%tpc, %g5		! IMMU has no SFAR, use TPC
+	stxa		%g0, [%g3] ASI_IMMU	! Clear FaultValid bit
+	membar		#Sync
+	sethi		%hi(109f), %g7
+	ba,pt		%xcc, etrap
+109:	 or		%g7, %lo(109b), %g7
+	mov		%l4, %o1
+	mov		%l5, %o2
+	call		spitfire_insn_access_exception
+	 add		%sp, PTREGS_OFF, %o0
+	ba,a,pt		%xcc, rtrap
+	.size		__spitfire_insn_access_exception,.-__spitfire_insn_access_exception