From c37a63afc429ce959402168f67e4f094ab639ace Mon Sep 17 00:00:00 2001 From: Santosh Sivaraj Date: Thu, 9 Jul 2020 19:21:41 +0530 Subject: [PATCH] powerpc/mce: Add MCE notification chain Introduce notification chain which lets us know about uncorrected memory errors(UE). This would help prospective users in pmem or nvdimm subsystem to track bad blocks for better handling of persistent memory allocations. Signed-off-by: Santosh Sivaraj Signed-off-by: Ganesh Goudar Reviewed-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200709135142.721504-1-santosh@fossix.org --- arch/powerpc/include/asm/mce.h | 2 ++ arch/powerpc/kernel/mce.c | 15 +++++++++++++++ 2 files changed, 17 insertions(+) diff --git a/arch/powerpc/include/asm/mce.h b/arch/powerpc/include/asm/mce.h index 376a395daf32..7bdd0cd4f2de 100644 --- a/arch/powerpc/include/asm/mce.h +++ b/arch/powerpc/include/asm/mce.h @@ -220,6 +220,8 @@ extern void machine_check_print_event_info(struct machine_check_event *evt, unsigned long addr_to_pfn(struct pt_regs *regs, unsigned long addr); extern void mce_common_process_ue(struct pt_regs *regs, struct mce_error_info *mce_err); +int mce_register_notifier(struct notifier_block *nb); +int mce_unregister_notifier(struct notifier_block *nb); #ifdef CONFIG_PPC_BOOK3S_64 void flush_and_reload_slb(void); #endif /* CONFIG_PPC_BOOK3S_64 */ diff --git a/arch/powerpc/kernel/mce.c b/arch/powerpc/kernel/mce.c index fd90c0eda229..b7b3ed4e6193 100644 --- a/arch/powerpc/kernel/mce.c +++ b/arch/powerpc/kernel/mce.c @@ -49,6 +49,20 @@ static struct irq_work mce_ue_event_irq_work = { DECLARE_WORK(mce_ue_event_work, machine_process_ue_event); +static BLOCKING_NOTIFIER_HEAD(mce_notifier_list); + +int mce_register_notifier(struct notifier_block *nb) +{ + return blocking_notifier_chain_register(&mce_notifier_list, nb); +} +EXPORT_SYMBOL_GPL(mce_register_notifier); + +int mce_unregister_notifier(struct notifier_block *nb) +{ + return blocking_notifier_chain_unregister(&mce_notifier_list, nb); +} +EXPORT_SYMBOL_GPL(mce_unregister_notifier); + static void mce_set_error_info(struct machine_check_event *mce, struct mce_error_info *mce_err) { @@ -278,6 +292,7 @@ static void machine_process_ue_event(struct work_struct *work) while (__this_cpu_read(mce_ue_count) > 0) { index = __this_cpu_read(mce_ue_count) - 1; evt = this_cpu_ptr(&mce_ue_event_queue[index]); + blocking_notifier_call_chain(&mce_notifier_list, 0, evt); #ifdef CONFIG_MEMORY_FAILURE /* * This should probably queued elsewhere, but -- 2.17.1