linux-kernel - [tip:perf/urgent] perf/x86: Fix P6 FP

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Date:	Wed, 24 Oct 2012 02:59:38 -0700
From:	tip-bot for Vince Weaver <vincent.weaver@...ne.edu>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	vincent.weaver@...ne.edu, a.p.zijlstra@...llo.nl,
	tglx@...utronix.de
Subject: [tip:perf/urgent] perf/x86: Fix P6 FP_ASSIST event constraint

Commit-ID:  7991c9ca40d3127dd2ffa3a9c1e33f7d4005495a
Gitweb:     http://git.kernel.org/tip/7991c9ca40d3127dd2ffa3a9c1e33f7d4005495a
Author:     Vince Weaver <vincent.weaver@...ne.edu>
AuthorDate: Fri, 19 Oct 2012 17:30:01 -0400
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 24 Oct 2012 10:31:57 +0200

perf/x86: Fix P6 FP_ASSIST event constraint

According to Intel SDM Volume 3B, FP_ASSIST is limited to Counter 1 only,
not Counter 0.

Tested on a Pentium II.

Signed-off-by: Vince Weaver <vincent.weaver@...ne.edu>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/r/alpine.DEB.2.02.1210191728570.14552@vincent-weaver-1.um.maine.edu
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/cpu/perf_event_p6.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/cpu/perf_event_p6.c b/arch/x86/kernel/cpu/perf_event_p6.c
index e4dd0f7..0ff5f7f 100644
--- a/arch/x86/kernel/cpu/perf_event_p6.c
+++ b/arch/x86/kernel/cpu/perf_event_p6.c
@@ -34,7 +34,7 @@ static struct event_constraint p6_event_constraints[] =
 {
 	INTEL_EVENT_CONSTRAINT(0xc1, 0x1),	/* FLOPS */
 	INTEL_EVENT_CONSTRAINT(0x10, 0x1),	/* FP_COMP_OPS_EXE */
-	INTEL_EVENT_CONSTRAINT(0x11, 0x1),	/* FP_ASSIST */
+	INTEL_EVENT_CONSTRAINT(0x11, 0x2),	/* FP_ASSIST */
 	INTEL_EVENT_CONSTRAINT(0x12, 0x2),	/* MUL */
 	INTEL_EVENT_CONSTRAINT(0x13, 0x2),	/* DIV */
 	INTEL_EVENT_CONSTRAINT(0x14, 0x1),	/* CYCLES_DIV_BUSY */
--
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