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RAS/CEC: Sanity-check array on every insertion 

Check the elements order in the array after every insertion.

Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
This commit is contained in:
Borislav Petkov 2019-04-21 21:41:45 +02:00
parent d0e375e8f2
commit 9632a3299b
1 changed files with 31 additions and 6 deletions
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37
drivers/ras/cec.c
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@ -276,11 +276,39 @@ static u64 __maybe_unused del_lru_elem(void)
return pfn;
}
static bool sanity_check(struct ce_array *ca)
{
bool ret = false;
u64 prev = 0;
int i;
for (i = 0; i < ca->n; i++) {
u64 this = PFN(ca->array[i]);
if (WARN(prev > this, "prev: 0x%016llx <-> this: 0x%016llx\n", prev, this))
ret = true;
prev = this;
}
if (!ret)
return ret;
pr_info("Sanity check dump:\n{ n: %d\n", ca->n);
for (i = 0; i < ca->n; i++) {
u64 this = PFN(ca->array[i]);
pr_info(" %03d: [%016llx|%03llx]\n", i, this, FULL_COUNT(ca->array[i]));
}
pr_info("}\n");
return ret;
}
int cec_add_elem(u64 pfn)
{
struct ce_array *ca = &ce_arr;
unsigned int to;
unsigned int to = 0;
int count, ret = 0;
/*
@ -345,6 +373,8 @@ int cec_add_elem(u64 pfn)
if (ca->decay_count >= CLEAN_ELEMS)
do_spring_cleaning(ca);
WARN_ON_ONCE(sanity_check(ca));
unlock:
mutex_unlock(&ce_mutex);
@ -402,7 +432,6 @@ DEFINE_DEBUGFS_ATTRIBUTE(count_threshold_ops, u64_get, count_threshold_set, "%ll
static int array_dump(struct seq_file *m, void *v)
{
struct ce_array *ca = &ce_arr;
u64 prev = 0;
int i;
mutex_lock(&ce_mutex);
@ -412,10 +441,6 @@ static int array_dump(struct seq_file *m, void *v)
u64 this = PFN(ca->array[i]);
seq_printf(m, " %03d: [%016llx|%03llx]\n", i, this, FULL_COUNT(ca->array[i]));
WARN_ON(prev > this);
prev = this;
}
seq_printf(m, "}\n");