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perf, x86: Disable PEBS on SandyBridge chips

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Cc: Stephane Eranian <eranian@google.com>
Cc: stable@kernel.org
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra
2011-11-15 10:51:15 +01:00
committed by Ingo Molnar
parent 4a1dba7238
commit 6a600a8b87
1 changed files with 8 additions and 0 deletions
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8
arch/x86/kernel/cpu/perf_event_intel.c
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@@ -1545,6 +1545,13 @@ static void intel_clovertown_quirks(void)
x86_pmu.pebs_constraints = NULL; x86_pmu.pebs_constraints = NULL;
} }
static void intel_sandybridge_quirks(void)
{
printk(KERN_WARNING "PEBS disabled due to CPU errata.\n");
x86_pmu.pebs = 0;
x86_pmu.pebs_constraints = NULL;
}
__init int intel_pmu_init(void) __init int intel_pmu_init(void)
{ {
union cpuid10_edx edx; union cpuid10_edx edx;
@@ -1694,6 +1701,7 @@ __init int intel_pmu_init(void)
break; break;
case 42: /* SandyBridge */ case 42: /* SandyBridge */
x86_pmu.quirks = intel_sandybridge_quirks;
case 45: /* SandyBridge, "Romely-EP" */ case 45: /* SandyBridge, "Romely-EP" */
memcpy(hw_cache_event_ids, snb_hw_cache_event_ids, memcpy(hw_cache_event_ids, snb_hw_cache_event_ids,
sizeof(hw_cache_event_ids)); sizeof(hw_cache_event_ids));