linux-kernel - [tip:perfcounters/core] perf_counter/x86: Add a quirk for Atom processors

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Date:	Fri, 12 Jun 2009 11:51:29 GMT
From:	tip-bot for Yong Wang <yong.y.wang@...ux.intel.com>
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, yong.y.wang@...el.com, yong.y.wang@...ux.intel.com,
	tglx@...utronix.de, mingo@...e.hu
Subject: [tip:perfcounters/core] perf_counter/x86: Add a quirk for Atom processors

Commit-ID:  dff5da6d09daaab40a8741dce0ed3c2e94079de2
Gitweb:     http://git.kernel.org/tip/dff5da6d09daaab40a8741dce0ed3c2e94079de2
Author:     Yong Wang <yong.y.wang@...ux.intel.com>
AuthorDate: Fri, 12 Jun 2009 16:08:55 +0800
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Fri, 12 Jun 2009 13:48:32 +0200

perf_counter/x86: Add a quirk for Atom processors

The fixed-function performance counters do not work on current Atom
processors. Use the general-purpose ones instead.

Signed-off-by: Yong Wang <yong.y.wang@...el.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: <20090612080855.GA2286@...ng-moblin2.bj.intel.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 arch/x86/kernel/cpu/perf_counter.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/cpu/perf_counter.c b/arch/x86/kernel/cpu/perf_counter.c
index 895c82e..275bc14 100644
--- a/arch/x86/kernel/cpu/perf_counter.c
+++ b/arch/x86/kernel/cpu/perf_counter.c
@@ -968,6 +968,13 @@ fixed_mode_idx(struct perf_counter *counter, struct hw_perf_counter *hwc)
 	if (!x86_pmu.num_counters_fixed)
 		return -1;
 
+	/*
+	 * Quirk, IA32_FIXED_CTRs do not work on current Atom processors:
+	 */
+	if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL &&
+					boot_cpu_data.x86_model == 28)
+		return -1;
+
 	event = hwc->config & ARCH_PERFMON_EVENT_MASK;
 
 	if (unlikely(event == x86_pmu.event_map(PERF_COUNT_HW_INSTRUCTIONS)))
--
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