From 895e3dceeb97855dc9990136cbb80a842fe581aa Mon Sep 17 00:00:00 2001 From: Balbir Singh Date: Tue, 20 Aug 2019 13:43:50 +0530 Subject: powerpc/mce: Handle UE event for memcpy_mcsafe 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 Signed-off-by: Reza Arbab Signed-off-by: Balbir Singh Reviewed-by: Mahesh Salgaonkar Reviewed-by: Nicholas Piggin Signed-off-by: Santosh Sivaraj Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20190820081352.8641-6-santosh@fossix.org --- arch/powerpc/kernel/mce.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) (limited to 'arch/powerpc/kernel/mce.c') 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); } -- cgit v1.2.3