Hi Balbir, Balbir Singh <bsinghar...@gmail.com> writes:
> On 12/8/19 7:22 pm, Santosh Sivaraj wrote: >> If we take a UE on one of the instructions with a fixup entry, set nip >> to continue execution at the fixup entry. Stop processing the event >> further or print it. >> >> Co-developed-by: Reza Arbab <ar...@linux.ibm.com> >> Signed-off-by: Reza Arbab <ar...@linux.ibm.com> >> Cc: Mahesh Salgaonkar <mah...@linux.ibm.com> >> Signed-off-by: Santosh Sivaraj <sant...@fossix.org> >> --- > > Isn't this based on https://patchwork.ozlabs.org/patch/895294/? If so it > should still have my author tag and signed-off-by Originally when I received the series for posting, I had Reza's authorship and signed-off-by, since the patch changed significantly I added co-developed-by as Reza. I will update in the next spin. https://lore.kernel.org/linuxppc-dev/20190702051932.511-1-sant...@fossix.org/ Santosh > > Balbir Singh > >> arch/powerpc/include/asm/mce.h | 4 +++- >> arch/powerpc/kernel/mce.c | 16 ++++++++++++++++ >> arch/powerpc/kernel/mce_power.c | 15 +++++++++++++-- >> 3 files changed, 32 insertions(+), 3 deletions(-) >> >> diff --git a/arch/powerpc/include/asm/mce.h b/arch/powerpc/include/asm/mce.h >> index f3a6036b6bc0..e1931c8c2743 100644 >> --- a/arch/powerpc/include/asm/mce.h >> +++ b/arch/powerpc/include/asm/mce.h >> @@ -122,7 +122,8 @@ struct machine_check_event { >> enum MCE_UeErrorType ue_error_type:8; >> u8 effective_address_provided; >> u8 physical_address_provided; >> - u8 reserved_1[5]; >> + u8 ignore_event; >> + u8 reserved_1[4]; >> u64 effective_address; >> u64 physical_address; >> u8 reserved_2[8]; >> @@ -193,6 +194,7 @@ struct mce_error_info { >> enum MCE_Initiator initiator:8; >> enum MCE_ErrorClass error_class:8; >> bool sync_error; >> + bool ignore_event; >> }; >> >> #define MAX_MC_EVT 100 >> diff --git a/arch/powerpc/kernel/mce.c b/arch/powerpc/kernel/mce.c >> index a3b122a685a5..ec4b3e1087be 100644 >> --- a/arch/powerpc/kernel/mce.c >> +++ b/arch/powerpc/kernel/mce.c >> @@ -149,6 +149,7 @@ void save_mce_event(struct pt_regs *regs, long handled, >> if (phys_addr != ULONG_MAX) { >> mce->u.ue_error.physical_address_provided = true; >> mce->u.ue_error.physical_address = phys_addr; >> + mce->u.ue_error.ignore_event = mce_err->ignore_event; >> machine_check_ue_event(mce); >> } >> } >> @@ -266,8 +267,17 @@ static void machine_process_ue_event(struct work_struct >> *work) >> /* >> * This should probably queued elsewhere, but >> * oh! well >> + * >> + * Don't report this machine check because the caller has a >> + * asked us to ignore the event, it has a fixup handler which >> + * will do the appropriate error handling and reporting. >> */ >> if (evt->error_type == MCE_ERROR_TYPE_UE) { >> + if (evt->u.ue_error.ignore_event) { >> + __this_cpu_dec(mce_ue_count); >> + continue; >> + } >> + >> if (evt->u.ue_error.physical_address_provided) { >> unsigned long pfn; >> >> @@ -301,6 +311,12 @@ 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; >> evt = this_cpu_ptr(&mce_event_queue[index]); >> + >> + if (evt->error_type == MCE_ERROR_TYPE_UE && >> + evt->u.ue_error.ignore_event) { >> + __this_cpu_dec(mce_queue_count); >> + continue; >> + } >> machine_check_print_event_info(evt, false, false); >> __this_cpu_dec(mce_queue_count); >> } >> diff --git a/arch/powerpc/kernel/mce_power.c >> b/arch/powerpc/kernel/mce_power.c >> index e74816f045f8..1dd87f6f5186 100644 >> --- a/arch/powerpc/kernel/mce_power.c >> +++ b/arch/powerpc/kernel/mce_power.c >> @@ -11,6 +11,7 @@ >> >> #include <linux/types.h> >> #include <linux/ptrace.h> >> +#include <linux/extable.h> >> #include <asm/mmu.h> >> #include <asm/mce.h> >> #include <asm/machdep.h> >> @@ -18,6 +19,7 @@ >> #include <asm/pte-walk.h> >> #include <asm/sstep.h> >> #include <asm/exception-64s.h> >> +#include <asm/extable.h> >> >> /* >> * Convert an address related to an mm to a physical address. >> @@ -559,9 +561,18 @@ static int mce_handle_derror(struct pt_regs *regs, >> return 0; >> } >> >> -static long mce_handle_ue_error(struct pt_regs *regs) >> +static long mce_handle_ue_error(struct pt_regs *regs, >> + struct mce_error_info *mce_err) >> { >> long handled = 0; >> + const struct exception_table_entry *entry; >> + >> + entry = search_kernel_exception_table(regs->nip); >> + if (entry) { >> + mce_err->ignore_event = true; >> + regs->nip = extable_fixup(entry); >> + return 1; >> + } >> >> /* >> * On specific SCOM read via MMIO we may get a machine check >> @@ -594,7 +605,7 @@ static long mce_handle_error(struct pt_regs *regs, >> &phys_addr); >> >> if (!handled && mce_err.error_type == MCE_ERROR_TYPE_UE) >> - handled = mce_handle_ue_error(regs); >> + handled = mce_handle_ue_error(regs, &mce_err); >> >> save_mce_event(regs, handled, &mce_err, regs->nip, addr, phys_addr); >> >>
