linux-kernel - [tip:perfcounters/core] perf_counter, x86: Check old-AMD performance monitoring support

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Date:	Sat, 13 Jun 2009 14:49:21 GMT
From:	tip-bot for Jaswinder Singh Rajput <jaswinder@...nel.org>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, acme@...hat.com, paulus@...ba.org,
	hpa@...or.com, mingo@...hat.com, a.p.zijlstra@...llo.nl,
	efault@....de, jaswinder@...nel.org, jaswinderrajput@...il.com,
	robert.richter@....com, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:perfcounters/core] perf_counter, x86: Check old-AMD performance monitoring support

Commit-ID:  4d2be1267fcfb3a4d2198fd696aec5e3dcbce60e
Gitweb:     http://git.kernel.org/tip/4d2be1267fcfb3a4d2198fd696aec5e3dcbce60e
Author:     Jaswinder Singh Rajput <jaswinder@...nel.org>
AuthorDate: Thu, 11 Jun 2009 15:28:09 +0530
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Sat, 13 Jun 2009 12:58:25 +0200

perf_counter, x86: Check old-AMD performance monitoring support

AMD supports performance monitoring start from K7 (i.e. family 6),
so disable it for earlier AMD CPUs.

Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@...il.com>
Cc: Robert Richter <robert.richter@....com>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Mike Galbraith <efault@....de>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
LKML-Reference: <1244714289.6923.0.camel@...satnam>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 arch/x86/kernel/cpu/perf_counter.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/cpu/perf_counter.c b/arch/x86/kernel/cpu/perf_counter.c
index 275bc14..3c37c39 100644
--- a/arch/x86/kernel/cpu/perf_counter.c
+++ b/arch/x86/kernel/cpu/perf_counter.c
@@ -1459,6 +1459,10 @@ static int intel_pmu_init(void)
 
 static int amd_pmu_init(void)
 {
+	/* Performance-monitoring supported from K7 and later: */
+	if (boot_cpu_data.x86 < 6)
+		return -ENODEV;
+
 	x86_pmu = amd_pmu;
 
 	switch (boot_cpu_data.x86) {
--
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