Gitweb: http://git.kernel.org/linus/dff5da6d09daaab40a8741dce0ed3c2e94079de2
Commit: dff5da6d09daaab40a8741dce0ed3c2e94079de2
Parent: faafec1e61e61d350248af2a7e5f047606adab6e
Author: Yong Wang <yong.y.wang@linux.intel.com>
AuthorDate: Fri Jun 12 16:08:55 2009 +0800
Committer: Ingo Molnar <mingo@elte.hu>
CommitDate: Fri Jun 12 13:48:32 2009 +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@intel.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <20090612080855.GA2286@ywang-moblin2.bj.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.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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