diff options
| -rw-r--r-- | arch/powerpc/include/asm/machdep.h | 1 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/mce.h | 3 | ||||
| -rw-r--r-- | arch/powerpc/kernel/exceptions-64s.S | 129 | ||||
| -rw-r--r-- | arch/powerpc/kernel/mce.c | 9 | ||||
| -rw-r--r-- | arch/powerpc/kernel/mce_power.c | 2 | ||||
| -rw-r--r-- | arch/powerpc/platforms/powernv/opal.c | 2 | ||||
| -rw-r--r-- | arch/powerpc/platforms/powernv/setup.c | 11 | ||||
| -rw-r--r-- | arch/powerpc/platforms/pseries/pseries.h | 1 | ||||
| -rw-r--r-- | arch/powerpc/platforms/pseries/ras.c | 60 | ||||
| -rw-r--r-- | arch/powerpc/platforms/pseries/setup.c | 1 |
10 files changed, 213 insertions, 6 deletions
diff --git a/arch/powerpc/include/asm/machdep.h b/arch/powerpc/include/asm/machdep.h index a47de82fb8e2..b4831f1338db 100644 --- a/arch/powerpc/include/asm/machdep.h +++ b/arch/powerpc/include/asm/machdep.h @@ -108,6 +108,7 @@ struct machdep_calls { /* Early exception handlers called in realmode */ int (*hmi_exception_early)(struct pt_regs *regs); + long (*machine_check_early)(struct pt_regs *regs); /* Called during machine check exception to retrive fixup address. */ bool (*mce_check_early_recovery)(struct pt_regs *regs); diff --git a/arch/powerpc/include/asm/mce.h b/arch/powerpc/include/asm/mce.h index 3a1226e9b465..a8b8903e1844 100644 --- a/arch/powerpc/include/asm/mce.h +++ b/arch/powerpc/include/asm/mce.h @@ -210,4 +210,7 @@ extern void release_mce_event(void); extern void machine_check_queue_event(void); extern void machine_check_print_event_info(struct machine_check_event *evt, bool user_mode); +#ifdef CONFIG_PPC_BOOK3S_64 +void flush_and_reload_slb(void); +#endif /* CONFIG_PPC_BOOK3S_64 */ #endif /* __ASM_PPC64_MCE_H__ */ diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S index ea04dfb8c092..b36e11d73702 100644 --- a/arch/powerpc/kernel/exceptions-64s.S +++ b/arch/powerpc/kernel/exceptions-64s.S @@ -331,6 +331,9 @@ TRAMP_REAL_BEGIN(machine_check_pSeries) machine_check_fwnmi: SET_SCRATCH0(r13) /* save r13 */ EXCEPTION_PROLOG_0(PACA_EXMC) +BEGIN_FTR_SECTION + b machine_check_pSeries_early +END_FTR_SECTION_IFCLR(CPU_FTR_HVMODE) machine_check_pSeries_0: EXCEPTION_PROLOG_1(PACA_EXMC, KVMTEST_PR, 0x200) /* @@ -342,6 +345,103 @@ machine_check_pSeries_0: TRAMP_KVM_SKIP(PACA_EXMC, 0x200) +TRAMP_REAL_BEGIN(machine_check_pSeries_early) +BEGIN_FTR_SECTION + EXCEPTION_PROLOG_1(PACA_EXMC, NOTEST, 0x200) + mr r10,r1 /* Save r1 */ + lhz r11,PACA_IN_MCE(r13) + cmpwi r11,0 /* Are we in nested machine check */ + bne 0f /* Yes, we are. */ + /* First machine check entry */ + ld r1,PACAMCEMERGSP(r13) /* Use MC emergency stack */ +0: subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */ + addi r11,r11,1 /* increment paca->in_mce */ + sth r11,PACA_IN_MCE(r13) + /* Limit nested MCE to level 4 to avoid stack overflow */ + cmpwi r11,MAX_MCE_DEPTH + bgt 1f /* Check if we hit limit of 4 */ + mfspr r11,SPRN_SRR0 /* Save SRR0 */ + mfspr r12,SPRN_SRR1 /* Save SRR1 */ + EXCEPTION_PROLOG_COMMON_1() + EXCEPTION_PROLOG_COMMON_2(PACA_EXMC) + EXCEPTION_PROLOG_COMMON_3(0x200) + addi r3,r1,STACK_FRAME_OVERHEAD + BRANCH_LINK_TO_FAR(machine_check_early) /* Function call ABI */ + ld r12,_MSR(r1) + andi. r11,r12,MSR_PR /* See if coming from user. */ + bne 2f /* continue in V mode if we are. */ + + /* + * At this point we are not sure about what context we come from. + * We may be in the middle of switching stack. r1 may not be valid. + * Hence stay on emergency stack, call machine_check_exception and + * return from the interrupt. + * But before that, check if this is an un-recoverable exception. + * If yes, then stay on emergency stack and panic. + */ + andi. r11,r12,MSR_RI + beq 1f + + /* + * Check if we have successfully handled/recovered from error, if not + * then stay on emergency stack and panic. + */ + cmpdi r3,0 /* see if we handled MCE successfully */ + beq 1f /* if !handled then panic */ + + /* Stay on emergency stack and return from interrupt. */ + LOAD_HANDLER(r10,mce_return) + mtspr SPRN_SRR0,r10 + ld r10,PACAKMSR(r13) + mtspr SPRN_SRR1,r10 + RFI_TO_KERNEL + b . + +1: LOAD_HANDLER(r10,unrecover_mce) + mtspr SPRN_SRR0,r10 + ld r10,PACAKMSR(r13) + /* + * We are going down. But there are chances that we might get hit by + * another MCE during panic path and we may run into unstable state + * with no way out. Hence, turn ME bit off while going down, so that + * when another MCE is hit during panic path, hypervisor will + * power cycle the lpar, instead of getting into MCE loop. + */ + li r3,MSR_ME + andc r10,r10,r3 /* Turn off MSR_ME */ + mtspr SPRN_SRR1,r10 + RFI_TO_KERNEL + b . + + /* Move original SRR0 and SRR1 into the respective regs */ +2: ld r9,_MSR(r1) + mtspr SPRN_SRR1,r9 + ld r3,_NIP(r1) + mtspr SPRN_SRR0,r3 + ld r9,_CTR(r1) + mtctr r9 + ld r9,_XER(r1) + mtxer r9 + ld r9,_LINK(r1) + mtlr r9 + REST_GPR(0, r1) + REST_8GPRS(2, r1) + REST_GPR(10, r1) + ld r11,_CCR(r1) + mtcr r11 + /* Decrement paca->in_mce. */ + lhz r12,PACA_IN_MCE(r13) + subi r12,r12,1 + sth r12,PACA_IN_MCE(r13) + REST_GPR(11, r1) + REST_2GPRS(12, r1) + /* restore original r1. */ + ld r1,GPR1(r1) + SET_SCRATCH0(r13) /* save r13 */ + EXCEPTION_PROLOG_0(PACA_EXMC) + b machine_check_pSeries_0 +END_FTR_SECTION_IFCLR(CPU_FTR_HVMODE) + EXC_COMMON_BEGIN(machine_check_common) /* * Machine check is different because we use a different @@ -535,6 +635,35 @@ EXC_COMMON_BEGIN(unrecover_mce) bl unrecoverable_exception b 1b +EXC_COMMON_BEGIN(mce_return) + /* Invoke machine_check_exception to print MCE event and return. */ + addi r3,r1,STACK_FRAME_OVERHEAD + bl machine_check_exception + ld r9,_MSR(r1) + mtspr SPRN_SRR1,r9 + ld r3,_NIP(r1) + mtspr SPRN_SRR0,r3 + ld r9,_CTR(r1) + mtctr r9 + ld r9,_XER(r1) + mtxer r9 + ld r9,_LINK(r1) + mtlr r9 + REST_GPR(0, r1) + REST_8GPRS(2, r1) + REST_GPR(10, r1) + ld r11,_CCR(r1) + mtcr r11 + /* Decrement paca->in_mce. */ + lhz r12,PACA_IN_MCE(r13) + subi r12,r12,1 + sth r12,PACA_IN_MCE(r13) + REST_GPR(11, r1) + REST_2GPRS(12, r1) + /* restore original r1. */ + ld r1,GPR1(r1) + RFI_TO_KERNEL + b . EXC_REAL(data_access, 0x300, 0x80) EXC_VIRT(data_access, 0x4300, 0x80, 0x300) diff --git a/arch/powerpc/kernel/mce.c b/arch/powerpc/kernel/mce.c index efdd16a79075..bd933a75f0bc 100644 --- a/arch/powerpc/kernel/mce.c +++ b/arch/powerpc/kernel/mce.c @@ -488,10 +488,11 @@ long machine_check_early(struct pt_regs *regs) { long handled = 0; - __this_cpu_inc(irq_stat.mce_exceptions); - - if (cur_cpu_spec && cur_cpu_spec->machine_check_early) - handled = cur_cpu_spec->machine_check_early(regs); + /* + * See if platform is capable of handling machine check. + */ + if (ppc_md.machine_check_early) + handled = ppc_md.machine_check_early(regs); return handled; } diff --git a/arch/powerpc/kernel/mce_power.c b/arch/powerpc/kernel/mce_power.c index 3497c8329c1d..2016b58d564f 100644 --- a/arch/powerpc/kernel/mce_power.c +++ b/arch/powerpc/kernel/mce_power.c @@ -60,7 +60,7 @@ static unsigned long addr_to_pfn(struct pt_regs *regs, unsigned long addr) /* flush SLBs and reload */ #ifdef CONFIG_PPC_BOOK3S_64 -static void flush_and_reload_slb(void) +void flush_and_reload_slb(void) { /* Invalidate all SLBs */ slb_flush_all_realmode(); diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c index 38fe4087484a..62c291e23dbe 100644 --- a/arch/powerpc/platforms/powernv/opal.c +++ b/arch/powerpc/platforms/powernv/opal.c @@ -578,6 +578,8 @@ int opal_machine_check(struct pt_regs *regs) { struct machine_check_event evt; + __this_cpu_inc(irq_stat.mce_exceptions); + if (!get_mce_event(&evt, MCE_EVENT_RELEASE)) return 0; diff --git a/arch/powerpc/platforms/powernv/setup.c b/arch/powerpc/platforms/powernv/setup.c index adddde023622..c9cbd11a442e 100644 --- a/arch/powerpc/platforms/powernv/setup.c +++ b/arch/powerpc/platforms/powernv/setup.c @@ -437,6 +437,16 @@ static unsigned long pnv_get_proc_freq(unsigned int cpu) return ret_freq; } +static long pnv_machine_check_early(struct pt_regs *regs) +{ + long handled = 0; + + if (cur_cpu_spec && cur_cpu_spec->machine_check_early) + handled = cur_cpu_spec->machine_check_early(regs); + + return handled; +} + define_machine(powernv) { .name = "PowerNV", .probe = pnv_probe, @@ -448,6 +458,7 @@ define_machine(powernv) { .machine_shutdown = pnv_shutdown, .power_save = NULL, .calibrate_decr = generic_calibrate_decr, + .machine_check_early = pnv_machine_check_early, #ifdef CONFIG_KEXEC_CORE .kexec_cpu_down = pnv_kexec_cpu_down, #endif diff --git a/arch/powerpc/platforms/pseries/pseries.h b/arch/powerpc/platforms/pseries/pseries.h index 60db2ee511fb..619f8f3fa173 100644 --- a/arch/powerpc/platforms/pseries/pseries.h +++ b/arch/powerpc/platforms/pseries/pseries.h @@ -24,6 +24,7 @@ struct pt_regs; extern int pSeries_system_reset_exception(struct pt_regs *regs); extern int pSeries_machine_check_exception(struct pt_regs *regs); +extern long pseries_machine_check_realmode(struct pt_regs *regs); #ifdef CONFIG_SMP extern void smp_init_pseries(void); diff --git a/arch/powerpc/platforms/pseries/ras.c b/arch/powerpc/platforms/pseries/ras.c index 3500ad982706..0578c243ef01 100644 --- a/arch/powerpc/platforms/pseries/ras.c +++ b/arch/powerpc/platforms/pseries/ras.c @@ -27,6 +27,7 @@ #include <asm/machdep.h> #include <asm/rtas.h> #include <asm/firmware.h> +#include <asm/mce.h> #include "pseries.h" @@ -522,6 +523,43 @@ int pSeries_system_reset_exception(struct pt_regs *regs) return 0; /* need to perform reset */ } +static int mce_handle_error(struct rtas_error_log *errp) +{ + struct pseries_errorlog *pseries_log; + struct pseries_mc_errorlog *mce_log; + int disposition = rtas_error_disposition(errp); + u8 error_type; + + if (!rtas_error_extended(errp)) + goto out; + + pseries_log = get_pseries_errorlog(errp, PSERIES_ELOG_SECT_ID_MCE); + if (pseries_log == NULL) + goto out; + + mce_log = (struct pseries_mc_errorlog *)pseries_log->data; + error_type = mce_log->error_type; + +#ifdef CONFIG_PPC_BOOK3S_64 + if (disposition == RTAS_DISP_NOT_RECOVERED) { + switch (error_type) { + case MC_ERROR_TYPE_SLB: + case MC_ERROR_TYPE_ERAT: + /* Store the old slb content someplace. */ + flush_and_reload_slb(); + disposition = RTAS_DISP_FULLY_RECOVERED; + rtas_set_disposition_recovered(errp); + break; + default: + break; + } + } +#endif + +out: + return disposition; +} + /* * Process MCE rtas errlog event. */ @@ -598,11 +636,31 @@ int pSeries_machine_check_exception(struct pt_regs *regs) struct rtas_error_log *errp; if (fwnmi_active) { - errp = fwnmi_get_errinfo(regs); fwnmi_release_errinfo(); + errp = fwnmi_get_errlog(); if (errp && recover_mce(regs, errp)) return 1; } return 0; } + +long pseries_machine_check_realmode(struct pt_regs *regs) +{ + struct rtas_error_log *errp; + int disposition; + + if (fwnmi_active) { + errp = fwnmi_get_errinfo(regs); + /* + * Call to fwnmi_release_errinfo() in real mode causes kernel + * to panic. Hence we will call it as soon as we go into + * virtual mode. + */ + disposition = mce_handle_error(errp); + if (disposition == RTAS_DISP_FULLY_RECOVERED) + return 1; + } + + return 0; +} diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c index ba1791fd3234..e03f62a78649 100644 --- a/arch/powerpc/platforms/pseries/setup.c +++ b/arch/powerpc/platforms/pseries/setup.c @@ -1017,6 +1017,7 @@ define_machine(pseries) { .calibrate_decr = generic_calibrate_decr, .progress = rtas_progress, .system_reset_exception = pSeries_system_reset_exception, + .machine_check_early = pseries_machine_check_realmode, .machine_check_exception = pSeries_machine_check_exception, #ifdef CONFIG_KEXEC_CORE .machine_kexec = pSeries_machine_kexec, |