From: Borislav Petkov <[email protected]> For testing purposes only.
Signed-off-by: Borislav Petkov <[email protected]> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
