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Subject[RFC PATCH -v2 3/3] MCE, CE: Add debugging glue
Date
From: Borislav Petkov <bp@suse.de>

For testing purposes only.

Signed-off-by: Borislav Petkov <bp@suse.de>
---
arch/x86/kernel/cpu/mcheck/mce.c | 23 ++++++++++++++++++++++-
drivers/ras/ce.c | 28 +++++++++++++++++++++++++++-
2 files changed, 49 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index f908b4cd7448..fa92c46c0220 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -2579,9 +2579,26 @@ static int fake_panic_set(void *data, u64 val)
DEFINE_SIMPLE_ATTRIBUTE(fake_panic_fops, fake_panic_get,
fake_panic_set, "%llu\n");

+static u64 cec_pfn;
+
+static int cec_pfn_get(void *data, u64 *val)
+{
+ *val = cec_pfn;
+ return 0;
+}
+
+static int cec_pfn_set(void *data, u64 val)
+{
+ cec_pfn = val;
+
+ return ce_add_elem(val);
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(cec_pfn_ops, cec_pfn_get, cec_pfn_set, "0x%llx\n");
+
static int __init mcheck_debugfs_init(void)
{
- struct dentry *dmce, *ffake_panic;
+ struct dentry *dmce, *ffake_panic, *cec_pfn;

dmce = mce_get_debugfs_dir();
if (!dmce)
@@ -2591,6 +2608,10 @@ static int __init mcheck_debugfs_init(void)
if (!ffake_panic)
return -ENOMEM;

+ cec_pfn = debugfs_create_file("cec_pfn", 0400, dmce, NULL, &cec_pfn_ops);
+ if (!cec_pfn)
+ return -ENOMEM;
+
return 0;
}
#else
diff --git a/drivers/ras/ce.c b/drivers/ras/ce.c
index 6b66a587c3ae..4603c0003391 100644
--- a/drivers/ras/ce.c
+++ b/drivers/ras/ce.c
@@ -94,6 +94,25 @@ static struct ce_array {

static DEFINE_MUTEX(ce_mutex);

+static void dump_array(struct ce_array *ca)
+{
+ u64 prev = 0;
+ int i;
+
+ pr_info("{ n: %d\n", ca->n);
+ for (i = 0; i < ca->n; i++) {
+ u64 this = PFN(ca->array[i]);
+
+ pr_info(" %03d: [%016llu|%03llx]\n", i, this, FULL_COUNT(ca->array[i]));
+
+ WARN_ON(prev > this);
+
+ prev = this;
+ }
+
+ pr_info("}\n");
+}
+
/*
* Decrement decay value. We're using DECAY_BITS bits to denote decay of an
* element in the array. On insertion and any access, it gets maxed
@@ -180,6 +199,7 @@ static u64 del_lru_elem_unlocked(struct ce_array *ca)
{
unsigned int min = FULL_COUNT_MASK;
int i, min_idx = 0;
+ u64 pfn;

for (i = 0; i < ca->n; i++) {
unsigned int this = FULL_COUNT(ca->array[i]);
@@ -189,9 +209,14 @@ static u64 del_lru_elem_unlocked(struct ce_array *ca)
}
}

+ pfn = PFN(ca->array[min_idx]);
+
+ pr_err("%s: Deleting ca[%d]: %016llu|%03x\n",
+ __func__, min_idx, pfn, min);
+
__del_elem(ca, min_idx);

- return PFN(ca->array[min_idx]);
+ return pfn;
}

/*
@@ -266,6 +291,7 @@ int ce_add_elem(u64 pfn)
}

unlock:
+ dump_array(ca);
mutex_unlock(&ce_mutex);

return ret;
--
2.0.0


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