[PATCH 5/6] EDAC, mce_amd: Print syndrome register value on SMCA systems

[Borislav Petkov]

From: Yazen Ghannam <Yazen.Ghannam@xxxxxxx>

Print SyndV bit status and print the raw value of the MCA_SYND register.
Further decoding of the syndrome from struct mce.synd can be done in
other places where appropriate, e.g. DRAM ECC.

Boris: make the error stanza more compact by putting the error address
and syndrome on the same line:

  [Hardware Error]: Corrected error, no action required.
  [Hardware Error]: CPU:2 (17:0:0) MC4_STATUS[-|CE|-|PCC|AddrV|-|-|SyndV|CECC]: 0x96204100001e0117
  [Hardware Error]: Error Addr: 0x000000007f4c52e3, Syndrome: 0x0000000000000000
  [Hardware Error]: Invalid IP block specified.
  [Hardware Error]: cache level: L3/GEN, tx: DATA, mem-tx: RD

Signed-off-by: Yazen Ghannam <Yazen.Ghannam@xxxxxxx>
Cc: Aravind Gopalakrishnan <aravindksg.lkml@xxxxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Cc: linux-edac <linux-edac@xxxxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1467633035-32080-2-git-send-email-Yazen.Ghannam@xxxxxxx
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
---
 drivers/edac/mce_amd.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/edac/mce_amd.c b/drivers/edac/mce_amd.c
index 9b6800a79c7f..057ece577800 100644
--- a/drivers/edac/mce_amd.c
+++ b/drivers/edac/mce_amd.c
@@ -927,7 +927,7 @@ static void decode_smca_errors(struct mce *m)
 	size_t len;
 
 	if (rdmsr_safe(addr, &low, &high)) {
-		pr_emerg("Invalid IP block specified, error information is unreliable.\n");
+		pr_emerg(HW_ERR "Invalid IP block specified.\n");
 		return;
 	}
 
@@ -1078,6 +1078,8 @@ int amd_decode_mce(struct notifier_block *nb, unsigned long val, void *data)
 		u32 low, high;
 		u32 addr = MSR_AMD64_SMCA_MCx_CONFIG(m->bank);
 
+		pr_cont("|%s", ((m->status & MCI_STATUS_SYNDV) ? "SyndV" : "-"));
+
 		if (!rdmsr_safe(addr, &low, &high) &&
 		    (low & MCI_CONFIG_MCAX))
 			pr_cont("|%s", ((m->status & MCI_STATUS_TCC) ? "TCC" : "-"));
@@ -1091,12 +1093,18 @@ 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 "MC%d Error Address: 0x%016llx\n", m->bank, m->addr);
+		pr_emerg(HW_ERR "Error Addr: 0x%016llx", m->addr);
 
 	if (boot_cpu_has(X86_FEATURE_SMCA)) {
+		if (m->status & MCI_STATUS_SYNDV)
+			pr_cont(", Syndrome: 0x%016llx", m->synd);
+
+		pr_cont("\n");
+
 		decode_smca_errors(m);
 		goto err_code;
-	}
+	} else
+		pr_cont("\n");
 
 	if (!fam_ops)
 		goto err_code;
-- 
2.7.3