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x86/MCE: Make correctable error detection look at the Deferred bit 

AMD systems may log Deferred errors. These are errors that are uncorrected
but which do not need immediate action. The MCA_STATUS[UC] bit may not be
set for Deferred errors.

Flag the error as not correctable when MCA_STATUS[Deferred] is set and
do not feed it into the Correctable Errors Collector.

[ bp: Massage commit message. ]

Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20171212165143.27475-1-Yazen.Ghannam@amd.com
This commit is contained in:
Yazen Ghannam 2017-12-18 12:37:14 +01:00 committed by Thomas Gleixner
parent c6708d50f1
commit 179eb850ac
1 changed files with 12 additions and 1 deletions
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13
arch/x86/kernel/cpu/mcheck/mce.c
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@ -528,6 +528,17 @@ bool mce_is_memory_error(struct mce *m)
}
EXPORT_SYMBOL_GPL(mce_is_memory_error);
static bool mce_is_correctable(struct mce *m)
{
if (m->cpuvendor == X86_VENDOR_AMD && m->status & MCI_STATUS_DEFERRED)
return false;
if (m->status & MCI_STATUS_UC)
return false;
return true;
}
static bool cec_add_mce(struct mce *m)
{
if (!m)
@ -535,7 +546,7 @@ static bool cec_add_mce(struct mce *m)
/* We eat only correctable DRAM errors with usable addresses. */
if (mce_is_memory_error(m) &&
!(m->status & MCI_STATUS_UC) &&
mce_is_correctable(m) &&
mce_usable_address(m))
if (!cec_add_elem(m->addr >> PAGE_SHIFT))
return true;