diff options
| author | Michael Ellerman <mpe@ellerman.id.au> | 2017-04-03 15:29:34 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-04-03 16:12:00 +1000 |
| commit | 63f44d65143976af9b28cf70ebe23f2c8b38677a (patch) | |
| tree | 4edd63ac044b7aea15ba21450814f5fa87db03ac /arch/powerpc | |
| parent | 5b1d6fc2d4d927852214f2a7e2a8eb1bdce3b574 (diff) | |
powerpc/book3s: Print task info if we take a machine check in user mode
For an MCE (Machine Check Exception) that hits while in user mode
MSR(PR=1), print the task info to the console MCE error log. This may
help to identify an application that triggered the MCE.
After this patch the MCE console looks like:
Severe Machine check interrupt [Recovered]
NIP: [0000000010039778] PID: 762 Comm: ebizzy
Initiator: CPU
Error type: SLB [Multihit]
Effective address: 0000000010039778
Severe Machine check interrupt [Not recovered]
NIP: [0000000010039778] PID: 763 Comm: ebizzy
Initiator: CPU
Error type: UE [Page table walk ifetch]
Effective address: 0000000010039778
ebizzy[763]: unhandled signal 7 at 0000000010039778 nip 0000000010039778 lr 0000000010001b44 code 30004
Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/include/asm/mce.h | 3 | ||||
| -rw-r--r-- | arch/powerpc/kernel/mce.c | 15 | ||||
| -rw-r--r-- | arch/powerpc/platforms/powernv/opal.c | 2 |
3 files changed, 15 insertions, 5 deletions
diff --git a/arch/powerpc/include/asm/mce.h b/arch/powerpc/include/asm/mce.h index e3498b446788..81eff8631434 100644 --- a/arch/powerpc/include/asm/mce.h +++ b/arch/powerpc/include/asm/mce.h @@ -207,7 +207,8 @@ extern void save_mce_event(struct pt_regs *regs, long handled, extern int get_mce_event(struct machine_check_event *mce, bool release); 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); +extern void machine_check_print_event_info(struct machine_check_event *evt, + bool user_mode); extern uint64_t get_mce_fault_addr(struct machine_check_event *evt); #endif /* __ASM_PPC64_MCE_H__ */ diff --git a/arch/powerpc/kernel/mce.c b/arch/powerpc/kernel/mce.c index b960f00f4908..16eb0b508761 100644 --- a/arch/powerpc/kernel/mce.c +++ b/arch/powerpc/kernel/mce.c @@ -228,12 +228,13 @@ static void machine_check_process_queued_event(struct irq_work *work) while (__this_cpu_read(mce_queue_count) > 0) { index = __this_cpu_read(mce_queue_count) - 1; machine_check_print_event_info( - this_cpu_ptr(&mce_event_queue[index])); + this_cpu_ptr(&mce_event_queue[index]), false); __this_cpu_dec(mce_queue_count); } } -void machine_check_print_event_info(struct machine_check_event *evt) +void machine_check_print_event_info(struct machine_check_event *evt, + bool user_mode) { const char *level, *sevstr, *subtype; static const char *mc_ue_types[] = { @@ -311,7 +312,15 @@ void machine_check_print_event_info(struct machine_check_event *evt) printk("%s%s Machine check interrupt [%s]\n", level, sevstr, evt->disposition == MCE_DISPOSITION_RECOVERED ? "Recovered" : "Not recovered"); - printk("%s NIP [%016llx]: %pS\n", level, evt->srr0, (void *)evt->srr0); + + if (user_mode) { + printk("%s NIP: [%016llx] PID: %d Comm: %s\n", level, + evt->srr0, current->pid, current->comm); + } else { + printk("%s NIP [%016llx]: %pS\n", level, evt->srr0, + (void *)evt->srr0); + } + printk("%s Initiator: %s\n", level, evt->initiator == MCE_INITIATOR_CPU ? "CPU" : "Unknown"); switch (evt->error_type) { diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c index e0f856bfbfe8..296c9426f72b 100644 --- a/arch/powerpc/platforms/powernv/opal.c +++ b/arch/powerpc/platforms/powernv/opal.c @@ -435,7 +435,7 @@ int opal_machine_check(struct pt_regs *regs) evt.version); return 0; } - machine_check_print_event_info(&evt); + machine_check_print_event_info(&evt, user_mode(regs)); if (opal_recover_mce(regs, &evt)) return 1; |