linux-kernel - Re: [PATCH] perf, x86: Make cycles:p working on SNB

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Message-ID: <CABPqkBSwpUHYcq89K-DYwa-6+hV2zNN5t2_22VHV4ROVUWsoGA@mail.gmail.com>
Date:	Thu, 24 May 2012 09:58:14 +0200
From:	Stephane Eranian <eranian@...gle.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Namhyung Kim <namhyung.kim@....com>,
	Ingo Molnar <mingo@...hat.com>,
	Namhyung Kim <namhyung@...il.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Paul Mackerras <paulus@...ba.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] perf, x86: Make cycles:p working on SNB

On Thu, May 24, 2012 at 9:52 AM, Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
> On Thu, 2012-05-24 at 09:41 +0200, Stephane Eranian wrote:
>> So should we mark that
>> > as bad as well?
>> >
>> I never could but was told it was there too.
>>
>> > Also, do you happen to know if/when a u-code update would appear?
>> >
>> I am hoping Intel will release the ucode update very soon now. I will
>> post a patch
>> to re-enable PEBS on model 42 when that happens.
>
> OK, so how about I queue the below and if the u-code updates gets
> released before this hits Linus' tree we'll make it all go away ;-)
>
Let me get confirmation from Intel today before we do this.

> ---
> Subject: perf,x86: Mark PEBS as broken on SNB-EP as well
>
> As per information from Intel.
>
> Cc: Stephane Eranian <eranian@...gle.com>
> Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> ---
>  arch/x86/kernel/cpu/perf_event_intel.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/x86/kernel/cpu/perf_event_intel.c b/arch/x86/kernel/cpu/perf_event_intel.c
> index 166546e..6c8e400 100644
> --- a/arch/x86/kernel/cpu/perf_event_intel.c
> +++ b/arch/x86/kernel/cpu/perf_event_intel.c
> @@ -1840,8 +1840,8 @@ __init int intel_pmu_init(void)
>                break;
>
>        case 42: /* SandyBridge */
> -               x86_add_quirk(intel_sandybridge_quirk);
>        case 45: /* SandyBridge, "Romely-EP" */
> +               x86_add_quirk(intel_sandybridge_quirk);
>                memcpy(hw_cache_event_ids, snb_hw_cache_event_ids,
>                       sizeof(hw_cache_event_ids));
>
>
>
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