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/* 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
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