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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 <santosh@fossix.org>
Signed-off-by: Ganesh Goudar <ganeshgr@linux.ibm.com>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200709135142.721504-1-santosh@fossix.org
This commit is contained in:
Santosh Sivaraj 2020-07-09 19:21:41 +05:30 committed by Michael Ellerman
parent af9d00e93a
commit c37a63afc4
2 changed files with 17 additions and 0 deletions
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2
arch/powerpc/include/asm/mce.h
View File

@ -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 */

15
arch/powerpc/kernel/mce.c
View File

@ -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