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powerpc/book3s: Print task info if we take a machine check in user mode

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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>
This commit is contained in:
Michael Ellerman
2017-04-03 15:29:34 +10:00
parent 5b1d6fc2d4
commit 63f44d6514
3 changed files with 15 additions and 5 deletions
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3
arch/powerpc/include/asm/mce.h
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@@ -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__ */