AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2024-12-28 11:18:45 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity

x86/mce: Take action on UCNA/Deferred errors again

Browse Source 
Commit

  fa92c58694 ("x86, mce: Support memory error recovery for both UCNA
		and Deferred error in machine_check_poll")

added handling of UCNA and Deferred errors by adding them to the ring
for SRAO errors.

Later, commit

  fd4cf79fcc ("x86/mce: Remove the MCE ring for Action Optional errors")

switched storage from the SRAO ring to the unified pool that is still
in use today. In order to only act on the intended errors, a filter
for MCE_AO_SEVERITY is used -- effectively removing handling of
UCNA/Deferred errors again.

Extend the severity filter to include UCNA/Deferred errors again.
Also, generalize the naming of the notifier from SRAO to UC to capture
the extended scope.

Note, that this change may cause a message like the following to appear,
as the same address may be reported as SRAO and as UCNA:

 Memory failure: 0x5fe3284: already hardware poisoned

Technically, this is a return to previous behavior.

Signed-off-by: Jan H. Schönherr <jschoenh@amazon.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Tony Luck <tony.luck@intel.com>
Link: https://lkml.kernel.org/r/20200103150722.20313-2-jschoenh@amazon.de
This commit is contained in:
Jan H. Schönherr 2020-01-03 16:07:17 +01:00 committed by Borislav Petkov
parent 81736abd55
commit 8438b84ab4
2 changed files with 17 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/include/asm/mce.h
View File

@ -144,7 +144,7 @@ struct mce_log_buffer {
enum mce_notifier_prios {
MCE_PRIO_FIRST = INT_MAX,
MCE_PRIO_SRAO = INT_MAX - 1,
MCE_PRIO_UC = INT_MAX - 1,
MCE_PRIO_EXTLOG = INT_MAX - 2,
MCE_PRIO_NFIT = INT_MAX - 3,
MCE_PRIO_EDAC = INT_MAX - 4,

23
arch/x86/kernel/cpu/mce/core.c
View File

@ -156,10 +156,8 @@ void mce_log(struct mce *m)
}
EXPORT_SYMBOL_GPL(mce_log);
static struct notifier_block mce_srao_nb;
/*
* We run the default notifier if we have only the SRAO, the first and the
* We run the default notifier if we have only the UC, the first and the
* default notifier registered. I.e., the mandatory NUM_DEFAULT_NOTIFIERS
* notifiers registered on the chain.
*/
@ -585,26 +583,29 @@ static struct notifier_block first_nb = {
.priority = MCE_PRIO_FIRST,
};
static int srao_decode_notifier(struct notifier_block *nb, unsigned long val,
static int uc_decode_notifier(struct notifier_block *nb, unsigned long val,
void *data)
{
struct mce *mce = (struct mce *)data;
unsigned long pfn;
if (!mce)
if (!mce || !mce_usable_address(mce))
return NOTIFY_DONE;
if (mce->severity != MCE_AO_SEVERITY &&
mce->severity != MCE_DEFERRED_SEVERITY)
return NOTIFY_DONE;
if (mce_usable_address(mce) && (mce->severity == MCE_AO_SEVERITY)) {
pfn = mce->addr >> PAGE_SHIFT;
if (!memory_failure(pfn, 0))
set_mce_nospec(pfn);
}
return NOTIFY_OK;
}
static struct notifier_block mce_srao_nb = {
.notifier_call = srao_decode_notifier,
.priority = MCE_PRIO_SRAO,
static struct notifier_block mce_uc_nb = {
.notifier_call = uc_decode_notifier,
.priority = MCE_PRIO_UC,
};
static int mce_default_notifier(struct notifier_block *nb, unsigned long val,
@ -2032,7 +2033,7 @@ int __init mcheck_init(void)
{
mcheck_intel_therm_init();
mce_register_decode_chain(&first_nb);
mce_register_decode_chain(&mce_srao_nb);
mce_register_decode_chain(&mce_uc_nb);
mce_register_decode_chain(&mce_default_nb);
mcheck_vendor_init_severity();