linux-kernel - Re: [PATCH] [RESEND] perf/x86/intel/uncore: Fix the index of PCU.3 Broadwell CPUs

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Date:   Mon, 16 Jul 2018 11:07:08 -0400
From:   Masayoshi Mizuma <msys.mizuma@...il.com>
To:     kan.liang@...ux.intel.com, mingo@...nel.org, kan.liang@...el.com
Cc:     tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
        x86@...nel.org, linux-kernel@...r.kernel.org,
        m.mizuma@...fujitsu.com
Subject: Re: [PATCH] [RESEND] perf/x86/intel/uncore: Fix the index of PCU.3
 Broadwell CPUs



On 07/16/2018 10:29 AM, Liang, Kan wrote:
> 
> 
> On 7/15/2018 6:34 PM, Ingo Molnar wrote:
>>
>> * Masayoshi Mizuma <msys.mizuma@...il.com> wrote:
>>
>>> From: Masayoshi Mizuma <m.mizuma@...fujitsu.com>
>>>
>>> commit 15a3e845b01c ("perf/x86/intel/uncore: Fix SBOX support for
>>> Broadwell CPUs") introduced PCU.3 for Broadwell CPU. Unfortunately,
>>> the driver_data of PCU.3 conflicts to QPI Port 2 filter.
>>>
>>>      { /* QPI Port 2 filter  */
>>>              PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x6f46),
>>>              .driver_data = UNCORE_PCI_DEV_DATA(UNCORE_EXTRA_PCI_DEV, 2),
>>>
>>>      { /* PCU.3 (for Capability registers) */
>>>              PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x6fc0),
>>>              .driver_data = UNCORE_PCI_DEV_DATA(UNCORE_EXTRA_PCI_DEV,
>>>                                                 HSWEP_PCI_PCU_3),
>>>                               // HSWEP_PCI_PCU_3 == 2
>>
>>> --- a/arch/x86/events/intel/uncore_snbep.c
>>> +++ b/arch/x86/events/intel/uncore_snbep.c
>>> @@ -1030,6 +1030,7 @@ enum {
>>>       SNBEP_PCI_QPI_PORT0_FILTER,
>>>       SNBEP_PCI_QPI_PORT1_FILTER,
>>>       HSWEP_PCI_PCU_3,
>>> +    BDX_PCI_PCU_3,
>>>   };
>>
>> So we use a magic '2' enumerator in the 'QPI Port 2 filter', and that overlaps
>> with HSWEP_PCI_PCU_3, right?
>>
>> Shouldn't we clean up all the enumerators and not use magic numbers, and this fix
>> the conflict?
>>
> 
> Yes, it should fix the conflict. I will clean up the code.

Thanks a lot!
I would appreciate if you could add CC to me when you post the patch.

Thanks,
Masa 

> 
> Thanks,
> Kan
> 
> 
>> Thanks,
>>
>>     Ingo
>>