Commit c37a63af authored by Santosh Sivaraj's avatar Santosh Sivaraj Committed by Michael Ellerman
Browse files

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: default avatarSantosh Sivaraj <santosh@fossix.org>
Signed-off-by: default avatarGanesh Goudar <ganeshgr@linux.ibm.com>
Reviewed-by: default avatarChristophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200709135142.721504-1-santosh@fossix.org
parent af9d00e9

arch/powerpc/include/asm/mce.h

+2 −0
Original line number Diff line number Diff line
@@ -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 */

arch/powerpc/kernel/mce.c

+15 −0
Original line number Diff line number Diff line
@@ -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

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