linux-kernel - Re: [PATCH] perf/x86/uncore: Fix IVT/SNB-EP uncore CBOX NID filter table

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Date:	Thu, 20 Feb 2014 09:56:16 +0100
From:	Stephane Eranian <eranian@...gle.com>
To:	"Yan, Zheng" <zheng.z.yan@...el.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>
Subject: Re: [PATCH] perf/x86/uncore: Fix IVT/SNB-EP uncore CBOX NID filter table

On Thu, Feb 20, 2014 at 7:20 AM, Yan, Zheng <zheng.z.yan@...el.com> wrote:
> On 02/19/2014 09:10 PM, Stephane Eranian wrote:
>>
>> This patch updates the CBOX PMU filters mapping tables for SNB-EP
>> and IVT (model 45 and 62 respectively).
>>
>> The NID umask always comes in addition to another umask.
>> When set, the NID filter is applied.
>
> Do you means the NID always applies for LLC_LOOKUP no matter what umask is.
> If yes, I think it's better to define filter as SNBEP_CBO_EVENT_EXTRA_REG(0x34, 0xff, 0x6)
>
No. I mean you can add NID umask to any other umask but it cannot be
used by itself.
In other words, LLC_LOOKUP.NID is not allowed but LLC_LOOKUP.DATA_READ.NID is.

That is what I gathered from the description in the specs.


> Regards
> Yan, Zheng
>
>>
>> The current mapping tables were missing some code/umask
>> combinations to account for the NID umask. This patch
>> fixes that.
>>
>> Signed-off-by: Stephane Eranian <eranian@...gle.com>
>>
>> diff --git a/arch/x86/kernel/cpu/perf_event_intel_uncore.c b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
>> --- a/arch/x86/kernel/cpu/perf_event_intel_uncore.c
>> +++ b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
>> @@ -501,8 +501,11 @@ static struct extra_reg snbep_uncore_cbox_extra_regs[] = {
>>       SNBEP_CBO_EVENT_EXTRA_REG(SNBEP_CBO_PMON_CTL_TID_EN,
>>                                 SNBEP_CBO_PMON_CTL_TID_EN, 0x1),
>>       SNBEP_CBO_EVENT_EXTRA_REG(0x0334, 0xffff, 0x4),
>> +     SNBEP_CBO_EVENT_EXTRA_REG(0x4334, 0xffff, 0x6),
>>       SNBEP_CBO_EVENT_EXTRA_REG(0x0534, 0xffff, 0x4),
>> +     SNBEP_CBO_EVENT_EXTRA_REG(0x4534, 0xffff, 0x6),
>>       SNBEP_CBO_EVENT_EXTRA_REG(0x0934, 0xffff, 0x4),
>> +     SNBEP_CBO_EVENT_EXTRA_REG(0x4934, 0xffff, 0x6),
>>       SNBEP_CBO_EVENT_EXTRA_REG(0x4134, 0xffff, 0x6),
>>       SNBEP_CBO_EVENT_EXTRA_REG(0x0135, 0xffff, 0x8),
>>       SNBEP_CBO_EVENT_EXTRA_REG(0x0335, 0xffff, 0x8),
>> @@ -1178,10 +1181,15 @@ static struct extra_reg ivt_uncore_cbox_extra_regs[] = {
>>       SNBEP_CBO_EVENT_EXTRA_REG(SNBEP_CBO_PMON_CTL_TID_EN,
>>                                 SNBEP_CBO_PMON_CTL_TID_EN, 0x1),
>>       SNBEP_CBO_EVENT_EXTRA_REG(0x1031, 0x10ff, 0x2),
>> +     SNBEP_CBO_EVENT_EXTRA_REG(0x1134, 0xffff, 0x4),
>> +     SNBEP_CBO_EVENT_EXTRA_REG(0x4134, 0xffff, 0xc),
>> +     SNBEP_CBO_EVENT_EXTRA_REG(0x5134, 0xffff, 0xc),
>>       SNBEP_CBO_EVENT_EXTRA_REG(0x0334, 0xffff, 0x4),
>> +     SNBEP_CBO_EVENT_EXTRA_REG(0x4334, 0xffff, 0xc),
>>       SNBEP_CBO_EVENT_EXTRA_REG(0x0534, 0xffff, 0x4),
>> +     SNBEP_CBO_EVENT_EXTRA_REG(0x4534, 0xffff, 0xc),
>>       SNBEP_CBO_EVENT_EXTRA_REG(0x0934, 0xffff, 0x4),
>> -     SNBEP_CBO_EVENT_EXTRA_REG(0x4134, 0xffff, 0xc),
>> +     SNBEP_CBO_EVENT_EXTRA_REG(0x4934, 0xffff, 0xc),
>>       SNBEP_CBO_EVENT_EXTRA_REG(0x0135, 0xffff, 0x10),
>>       SNBEP_CBO_EVENT_EXTRA_REG(0x0335, 0xffff, 0x10),
>>       SNBEP_CBO_EVENT_EXTRA_REG(0x2135, 0xffff, 0x10),
>>
>
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