linux-kernel - [tip:ras/core] x86/mce/AMD: Reduce number of blocks scanned per bank

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Date:	Mon, 1 Feb 2016 03:41:12 -0800
From:	tip-bot for Aravind Gopalakrishnan <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	tony.luck@...el.com, mingo@...nel.org,
	linux-kernel@...r.kernel.org, tglx@...utronix.de,
	linux-edac@...r.kernel.org, peterz@...radead.org, bp@...en8.de,
	Aravind.Gopalakrishnan@....com, hpa@...or.com,
	torvalds@...ux-foundation.org, bp@...e.de
Subject: [tip:ras/core] x86/mce/AMD:
  Reduce number of blocks scanned per bank

Commit-ID:  60f116fca162d9488f783f5014779463243ab7a2
Gitweb:     http://git.kernel.org/tip/60f116fca162d9488f783f5014779463243ab7a2
Author:     Aravind Gopalakrishnan <Aravind.Gopalakrishnan@....com>
AuthorDate: Mon, 25 Jan 2016 20:41:50 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 1 Feb 2016 10:53:57 +0100

x86/mce/AMD: Reduce number of blocks scanned per bank

>From Fam17h onwards, the number of extended MCx_MISC register blocks is
reduced to 4. It is an architectural change from what we had on
earlier processors.

Although theoritically the total number of extended MCx_MISC
registers was 8 in earlier processor families, in practice we
only had to use the extra registers for MC4. And only 2 of those
were used. So this change does not affect older processors.
Tested on Fam10h and Fam15h systems.

Signed-off-by: Aravind Gopalakrishnan <Aravind.Gopalakrishnan@....com>
Signed-off-by: Borislav Petkov <bp@...e.de>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Tony Luck <tony.luck@...el.com>
Cc: linux-edac <linux-edac@...r.kernel.org>
Link: http://lkml.kernel.org/r/1453750913-4781-6-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/cpu/mcheck/mce_amd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/mcheck/mce_amd.c b/arch/x86/kernel/cpu/mcheck/mce_amd.c
index 3068ce2..5982227 100644
--- a/arch/x86/kernel/cpu/mcheck/mce_amd.c
+++ b/arch/x86/kernel/cpu/mcheck/mce_amd.c
@@ -28,7 +28,7 @@
 #include <asm/msr.h>
 #include <asm/trace/irq_vectors.h>
 
-#define NR_BLOCKS         9
+#define NR_BLOCKS         5
 #define THRESHOLD_MAX     0xFFF
 #define INT_TYPE_APIC     0x00020000
 #define MASK_VALID_HI     0x80000000