x86, MCE: Drain mcelog buffer
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:
parent
3653ada5d3
commit
0937195715
|
@ -189,9 +189,48 @@ void mce_log(struct mce *mce)
|
||||||
set_bit(0, &mce_need_notify);
|
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)
|
void mce_register_decode_chain(struct notifier_block *nb)
|
||||||
{
|
{
|
||||||
atomic_notifier_chain_register(&x86_mce_decoder_chain, nb);
|
atomic_notifier_chain_register(&x86_mce_decoder_chain, nb);
|
||||||
|
drain_mcelog_buffer();
|
||||||
}
|
}
|
||||||
EXPORT_SYMBOL_GPL(mce_register_decode_chain);
|
EXPORT_SYMBOL_GPL(mce_register_decode_chain);
|
||||||
|
|
||||||
|
|
Loading…
Reference in New Issue