linux-kernel - [PATCH review for 4.9 48/50] EDAC, mce_amd: Print IPID and Syndrome on a separate line

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Message-ID: <20170925011225.10029-48-alexander.levin@verizon.com>
Date:   Mon, 25 Sep 2017 01:12:58 +0000
From:   "Levin, Alexander (Sasha Levin)" <alexander.levin@...izon.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Cc:     Yazen Ghannam <Yazen.Ghannam@....com>,
        linux-edac <linux-edac@...r.kernel.org>,
        Borislav Petkov <bp@...e.de>,
        "Levin, Alexander (Sasha Levin)" <alexander.levin@...izon.com>
Subject: [PATCH review for 4.9 48/50] EDAC, mce_amd: Print IPID and Syndrome
 on a separate line

From: Yazen Ghannam <Yazen.Ghannam@....com>

[ Upstream commit 75bf2f6478cab9b0c1d7f5f674a765d1e2ad530e ]

Currently, the IPID and Syndrome are printed on the same line as the
Address. There are cases when we can have a valid Syndrome but not a
valid Address.

For example, the MCA_SYND register can be used to hold more detailed
error info that the hardware folks can use. It's not just DRAM ECC
syndromes. There are some error types that aren't related to memory that
may have valid syndromes, like some errors related to links in the Data
Fabric, etc.

In these cases, the IPID and Syndrome are not printed at the same log
level as the rest of the stanza, so users won't see them on the console.

Console:
  [Hardware Error]: CPU:16 (17:1:0) MC22_STATUS[Over|CE|MiscV|-|-|-|-|SyndV|-]: 0xd82000000002080b
  [Hardware Error]: Power, Interrupts, etc. Extended Error Code: 2

Dmesg:
  [Hardware Error]: CPU:16 (17:1:0) MC22_STATUS[Over|CE|MiscV|-|-|-|-|SyndV|-]: 0xd82000000002080b
  , Syndrome: 0x000000010b404000, IPID: 0x0001002e00000002
  [Hardware Error]: Power, Interrupts, etc. Extended Error Code: 2

Print the IPID first and on a new line. The IPID should always be
printed on SMCA systems. The Syndrome will then be printed with the IPID
and at the same log level when valid:

  [Hardware Error]: CPU:16 (17:1:0) MC22_STATUS[Over|CE|MiscV|-|-|-|-|SyndV|-]: 0xd82000000002080b
  [Hardware Error]: IPID: 0x0001002e00000002, Syndrome: 0x000000010b404000
  [Hardware Error]: Power, Interrupts, etc. Extended Error Code: 2

Signed-off-by: Yazen Ghannam <Yazen.Ghannam@....com>
Cc: linux-edac <linux-edac@...r.kernel.org>
Link: http://lkml.kernel.org/r/1487192182-2474-1-git-send-email-Yazen.Ghannam@amd.com
Signed-off-by: Borislav Petkov <bp@...e.de>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 drivers/edac/mce_amd.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/edac/mce_amd.c b/drivers/edac/mce_amd.c
index daaac2c79ca7..7db692ed3dea 100644
--- a/drivers/edac/mce_amd.c
+++ b/drivers/edac/mce_amd.c
@@ -981,20 +981,19 @@ int amd_decode_mce(struct notifier_block *nb, unsigned long val, void *data)
 	pr_cont("]: 0x%016llx\n", m->status);

 	if (m->status & MCI_STATUS_ADDRV)
-		pr_emerg(HW_ERR "Error Addr: 0x%016llx", m->addr);
+		pr_emerg(HW_ERR "Error Addr: 0x%016llx\n", m->addr);

 	if (boot_cpu_has(X86_FEATURE_SMCA)) {
+		pr_emerg(HW_ERR "IPID: 0x%016llx", m->ipid);
+
 		if (m->status & MCI_STATUS_SYNDV)
 			pr_cont(", Syndrome: 0x%016llx", m->synd);

-		pr_cont(", IPID: 0x%016llx", m->ipid);
-
 		pr_cont("\n");

 		decode_smca_errors(m);
 		goto err_code;
-	} else
-		pr_cont("\n");
+	}

 	if (!fam_ops)
 		goto err_code;
-- 
2.11.0