From: Borislav Petkov <b...@suse.de>
For testing purposes only.
Signed-off-by: Borislav Petkov <b...@suse.de>
---
arch/x86/kernel/cpu/mcheck/ce.c | 24 ++++++++++++++++++++++++
arch/x86/kernel/cpu/mcheck/mce.c | 31 ++++++++++++++++++++++++++++++-
2 files changed, 54 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kernel/cpu/mcheck/ce.c b/arch/x86/kernel/cpu/mcheck/ce.c
index 3020415f27f4..aa2fee325588 100644
--- a/arch/x86/kernel/cpu/mcheck/ce.c
+++ b/arch/x86/kernel/cpu/mcheck/ce.c
@@ -94,6 +94,25 @@ static struct ce_array {
static DEFINE_MUTEX(ce_lock);
+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
@@ -202,6 +221,9 @@ u64 ce_del_lru_elem(void)
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);
mutex_unlock(&ce_lock);
@@ -263,7 +285,9 @@ int ce_add_elem(u64 pfn)
ret = 0;
}
+
unlock:
+ dump_array(ca);
mutex_unlock(&ce_lock);
return ret;
diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 732fbe61416d..59b726d4e116 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -2552,9 +2552,34 @@ 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)
+{
+ int ret;
+
+ cec_pfn = val;
+
+ ret = ce_add_elem(val);
+ if (ret < 0) {
+ ce_del_lru_elem();
+ ret = ce_add_elem(val);
+ }
+
+ return ret;
+}
+
+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)
@@ -2564,6 +2589,10 @@ 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
--
1.9.0
--
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