linux-kernel - [tip:x86/core] x86/mce/amd: Collect valid address before logging an error

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Message-ID: <tip-6e6e746e33e9555a7fce159d25314c9df3bcda93@git.kernel.org>
Date:	Sun, 7 Jun 2015 10:37:00 -0700
From:	tip-bot for Aravind Gopalakrishnan <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	hpa@...or.com, Aravind.Gopalakrishnan@....com,
	linux-kernel@...r.kernel.org, bp@...e.de, x86@...nel.org,
	tglx@...utronix.de, mingo@...nel.org, linux-edac@...r.kernel.org,
	tony.luck@...el.com
Subject: [tip:x86/core] x86/mce/amd:
  Collect valid address before logging an error

Commit-ID:  6e6e746e33e9555a7fce159d25314c9df3bcda93
Gitweb:     http://git.kernel.org/tip/6e6e746e33e9555a7fce159d25314c9df3bcda93
Author:     Aravind Gopalakrishnan <Aravind.Gopalakrishnan@....com>
AuthorDate: Wed, 6 May 2015 06:58:54 -0500
Committer:  Borislav Petkov <bp@...e.de>
CommitDate: Wed, 6 May 2015 19:49:31 +0200

x86/mce/amd: Collect valid address before logging an error

amd_decode_mce() needs value in m->addr so it can report the error
address correctly. This should be setup in __log_error() before we call
mce_log(). We do this because the error address is an important bit of
information which should be conveyed to userspace.

The correct output then reports proper address, like this:

  [Hardware Error]: Corrected error, no action required.
  [Hardware Error]: CPU:0 (15:60:0) MC0_STATUS [-|CE|-|-|AddrV|-|-|CECC]: 0x840041000028017b
  [Hardware Error]: MC0 Error Address: 0x00001f808f0ff040

Signed-off-by: Aravind Gopalakrishnan <Aravind.Gopalakrishnan@....com>
Cc: Tony Luck <tony.luck@...el.com>
Cc: x86-ml <x86@...nel.org>
Cc: linux-edac <linux-edac@...r.kernel.org>
Link: http://lkml.kernel.org/r/1430913538-1415-3-git-send-email-Aravind.Gopalakrishnan@amd.com
Signed-off-by: Borislav Petkov <bp@...e.de>
---
 arch/x86/kernel/cpu/mcheck/mce_amd.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/mcheck/mce_amd.c b/arch/x86/kernel/cpu/mcheck/mce_amd.c
index 5f25de2..6070757 100644
--- a/arch/x86/kernel/cpu/mcheck/mce_amd.c
+++ b/arch/x86/kernel/cpu/mcheck/mce_amd.c
@@ -277,11 +277,14 @@ static void __log_error(unsigned int bank, bool threshold_err, u64 misc)
 
 	m.status = status;
 	m.bank = bank;
+
 	if (threshold_err)
 		m.misc = misc;
 
-	mce_log(&m);
+	if (m.status & MCI_STATUS_ADDRV)
+		rdmsrl(MSR_IA32_MCx_ADDR(bank), m.addr);
 
+	mce_log(&m);
 	wrmsrl(MSR_IA32_MCx_STATUS(bank), 0);
 }
 
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