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Subject[tip:ras/core] EDAC/mce_amd: Decode MCA_STATUS[Scrub] bit
Commit-ID:  3f4da372ec8e4ce58c17ac4f2e3c8891bbfea17e
Gitweb: https://git.kernel.org/tip/3f4da372ec8e4ce58c17ac4f2e3c8891bbfea17e
Author: Yazen Ghannam <yazen.ghannam@amd.com>
AuthorDate: Tue, 12 Feb 2019 21:24:28 +0000
Committer: Borislav Petkov <bp@suse.de>
CommitDate: Fri, 15 Feb 2019 14:25:58 +0100

EDAC/mce_amd: Decode MCA_STATUS[Scrub] bit

Previous AMD systems have had a bit in MCA_STATUS to indicate that an
error was detected on a scrub operation. However, this bit was defined
differently within different banks and families/models.

Starting with Family 17h, MCA_STATUS[40] is either Reserved/Read-as-Zero
or defined as "Scrub", for all MCA banks and CPU models. Therefore, this
bit can be defined as the "Scrub" bit.

Define MCA_STATUS[40] as "Scrub" and decode it in the AMD MCE decoding
module for Family 17h and newer systems.

Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Morse <james.morse@arm.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: Pu Wen <puwen@hygon.cn>
Cc: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Cc: x86-ml <x86@kernel.org>
Link: https://lkml.kernel.org/r/20190212212417.107049-1-Yazen.Ghannam@amd.com
---
arch/x86/include/asm/mce.h | 1 +
drivers/edac/mce_amd.c | 3 +++
2 files changed, 4 insertions(+)

diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h
index 299a38536567..22d05e3835f0 100644
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -48,6 +48,7 @@
#define MCI_STATUS_SYNDV BIT_ULL(53) /* synd reg. valid */
#define MCI_STATUS_DEFERRED BIT_ULL(44) /* uncorrected error, deferred exception */
#define MCI_STATUS_POISON BIT_ULL(43) /* access poisonous data */
+#define MCI_STATUS_SCRUB BIT_ULL(40) /* Error detected during scrub operation */

/*
* McaX field if set indicates a given bank supports MCA extensions:
diff --git a/drivers/edac/mce_amd.c b/drivers/edac/mce_amd.c
index f286b880f981..b349c22bb386 100644
--- a/drivers/edac/mce_amd.c
+++ b/drivers/edac/mce_amd.c
@@ -1078,6 +1078,9 @@ amd_decode_mce(struct notifier_block *nb, unsigned long val, void *data)
if (ecc)
pr_cont("|%sECC", ((ecc == 2) ? "C" : "U"));

+ if (fam >= 0x17)
+ pr_cont("|%s", (m->status & MCI_STATUS_SCRUB ? "Scrub" : "-"));
+
pr_cont("]: 0x%016llx\n", m->status);

if (m->status & MCI_STATUS_ADDRV)
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