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x86, MCE: Drain mcelog buffer

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Add a function which drains whatever MCEs were logged in already during
boot and before the decoder chains were registered.

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
This commit is contained in:
Borislav Petkov 2011-12-08 12:28:33 +01:00 committed by Borislav Petkov
parent 3653ada5d3
commit 0937195715
1 changed files with 39 additions and 0 deletions
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39
arch/x86/kernel/cpu/mcheck/mce.c
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@ -189,9 +189,48 @@ void mce_log(struct mce *mce)
set_bit(0, &mce_need_notify);
}
static void drain_mcelog_buffer(void)
{
unsigned int next, i, prev = 0;
next = rcu_dereference_check_mce(mcelog.next);
do {
struct mce *m;
/* drain what was logged during boot */
for (i = prev; i < next; i++) {
unsigned long start = jiffies;
unsigned retries = 1;
m = &mcelog.entry[i];
while (!m->finished) {
if (time_after_eq(jiffies, start + 2*retries))
retries++;
cpu_relax();
if (!m->finished && retries >= 4) {
pr_err("MCE: skipping error being logged currently!\n");
break;
}
}
smp_rmb();
atomic_notifier_call_chain(&x86_mce_decoder_chain, 0, m);
}
memset(mcelog.entry + prev, 0, (next - prev) * sizeof(*m));
prev = next;
next = cmpxchg(&mcelog.next, prev, 0);
} while (next != prev);
}
void mce_register_decode_chain(struct notifier_block *nb)
{
atomic_notifier_chain_register(&x86_mce_decoder_chain, nb);
drain_mcelog_buffer();
}
EXPORT_SYMBOL_GPL(mce_register_decode_chain);