linux-kernel - Re: [PATCH] perf/x86/intel/uncore: Fix the lack of ch

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Message-ID: <bff44127-73ec-469a-b82b-e8aa9062fe8e@linux.alibaba.com>
Date: Tue, 7 Jan 2025 09:55:12 +0800
From: Jing Zhang <renyu.zj@...ux.alibaba.com>
To: "Liang, Kan" <kan.liang@...ux.intel.com>,
 "Peter Zijlstra (Intel)" <peterz@...radead.org>,
 Ian Rogers <irogers@...gle.com>, Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Shuai Xue <xueshuai@...ux.alibaba.com>, linux-perf-users@...r.kernel.org,
 linux-kernel@...r.kernel.org, Thomas Falcon <thomas.falcon@...el.com>
Subject: Re: [PATCH] perf/x86/intel/uncore: Fix the lack of ch_mask format for
 SPR



在 2025/1/6 下午9:44, Liang, Kan 写道:
> 
> 
> On 2025-01-05 9:16 p.m., Jing Zhang wrote:
>>
>>
>> 在 2025/1/3 上午3:02, Liang, Kan 写道:
>>>
>>>
>>> On 2024-12-30 2:11 a.m., Jing Zhang wrote:
>>>> perf stat errors out with UNC_CHA_TOR_INSERTS.IA_HIT_CXL_ACC_LOCAL event
>>>> because of lack of ch_mask format in drivers, and perf test "104: perf
>>>> all PMU test (exclusive)" failed.
>>>>
>>>> $perf stat -e perf stat -e UNC_CHA_TOR_INSERTS.IA_HIT_CXL_ACC_LOCAL
>>>> sleep 1
>>>>
>>>> Initial error:
>>>> event syntax error: 'UNC_CHA_TOR_INSERTS.IA_HIT_CXL_ACC_LOCAL'
>>>>                                 \___ unknown term 'ch_mask' for pmu 'uncore_cha_0'
>>>>
>>>> 104: perf all PMU test (exclusive)                                   : FAILED!
>>>>
>>>> Add ch_mask format for SPR to fix it.
>>>>
>>>
>>> I don't think there is a ch_mask. It should be extended umask.
>>> The issue of the CHA extended umask should has been fixed by
>>> https://lore.kernel.org/lkml/172052531679.2215.16140288595428337453.tip-bot2@tip-bot2/
>>>
>>
>> I think it is not the same issue. I have this patch but still error.
>>
>> in "tools/perf/pmu-events/arch/x86/sapphirerapids/uncore-cache.json",
>> the event "UNC_CHA_TOR_INSERTS.IA_HIT_CXL_ACC_LOCAL" is described as:
>> {
>>         "BriefDescription": "UNC_CHA_TOR_INSERTS.IA_HIT_CXL_ACC_LOCAL",
>>         "Counter": "0,1,2,3",
>>         "EventCode": "0x35",
>>         "EventName": "UNC_CHA_TOR_INSERTS.IA_HIT_CXL_ACC_LOCAL",
>>         "Experimental": "1",
>>         "PerPkg": "1",
>>         "PortMask": "0x000",
>>         "UMask": "0x10c0008101",
>>         "Unit": "CHA"
>> },
>>
>> the PortMask is ch_mask, but driver not output ch_mask on SPR, it causes error.
> 
> There is no ch_mask on SPR. It should be Extended Umask.
> The convertor tool should avoid generating the PortMask and FCMask for
> SPR/EMR/GNR.

Oh, I see. Maybe the event description is inaccurate.

Thanks,
Jing

> 
> + Thomas
> 
> Could you please take a look? We may have to re-generate the event list.
> 
> Thanks,
> Kan
> 
>>
>> Thanks,
>> Jing
>>
>>> Thanks,
>>> Kan
>>
>>
>>
>>
>>>> Fixes: 949b11381f81 ("perf/x86/intel/uncore: Add Sapphire Rapids server CHA support")
>>>> Signed-off-by: Jing Zhang <renyu.zj@...ux.alibaba.com>
>>>> ---
>>>>  arch/x86/events/intel/uncore_snbep.c | 1 +
>>>>  1 file changed, 1 insertion(+)
>>>>
>>>> diff --git a/arch/x86/events/intel/uncore_snbep.c b/arch/x86/events/intel/uncore_snbep.c
>>>> index ca98744..e537623 100644
>>>> --- a/arch/x86/events/intel/uncore_snbep.c
>>>> +++ b/arch/x86/events/intel/uncore_snbep.c
>>>> @@ -5967,6 +5967,7 @@ static int spr_cha_hw_config(struct intel_uncore_box *box, struct perf_event *ev
>>>>  	&format_attr_inv.attr,
>>>>  	&format_attr_thresh8.attr,
>>>>  	&format_attr_filter_tid5.attr,
>>>> +	&format_attr_ch_mask.attr,
>>>>  	NULL,
>>>>  };
>>>>  static const struct attribute_group spr_uncore_chabox_format_group = {
>>
>