linux-kernel - Re: [PATCH v2,RESEND 1/2] drivers: perf: added capabilities for legacy PMU

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Message-ID: <mhng-320add25-610e-4e86-a266-55a5f0b52087@palmer-ri-x1c9a>
Date: Tue, 27 Feb 2024 12:56:59 -0800 (PST)
From: Palmer Dabbelt <palmer@...belt.com>
To: alex@...ti.fr
CC: vadim.shakirov@...tacore.com, linux-riscv@...ts.infradead.org,
  atishp@...shpatra.org, anup@...infault.org, Will Deacon <will@...nel.org>,
  Mark Rutland <mark.rutland@....com>, Paul Walmsley <paul.walmsley@...ive.com>, aou@...s.berkeley.edu,
  linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, Atish Patra <atishp@...osinc.com>
Subject:     Re: [PATCH v2,RESEND 1/2] drivers: perf: added capabilities for legacy PMU

On Tue, 27 Feb 2024 11:26:20 PST (-0800), alex@...ti.fr wrote:
> On 27/02/2024 18:00, Vadim Shakirov wrote:
>> Added the PERF_PMU_CAP_NO_INTERRUPT flag because the legacy pmu driver
>> does not provide sampling capabilities
>>
>> Added the PERF_PMU_CAP_NO_EXCLUDE flag because the legacy pmu driver
>> does not provide the ability to disable counter incrementation in
>> different privilege modes
>>
>> Suggested-by: Atish Patra <atishp@...osinc.com>
>> Signed-off-by: Vadim Shakirov <vadim.shakirov@...tacore.com>
>> ---
>>   drivers/perf/riscv_pmu_legacy.c | 2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/drivers/perf/riscv_pmu_legacy.c b/drivers/perf/riscv_pmu_legacy.c
>> index 79fdd667922e..a85fc9a15f03 100644
>> --- a/drivers/perf/riscv_pmu_legacy.c
>> +++ b/drivers/perf/riscv_pmu_legacy.c
>> @@ -117,6 +117,8 @@ static void pmu_legacy_init(struct riscv_pmu *pmu)
>>   	pmu->event_mapped = pmu_legacy_event_mapped;
>>   	pmu->event_unmapped = pmu_legacy_event_unmapped;
>>   	pmu->csr_index = pmu_legacy_csr_index;
>> +	pmu->pmu.capabilities |= PERF_PMU_CAP_NO_INTERRUPT;
>> +	pmu->pmu.capabilities |= PERF_PMU_CAP_NO_EXCLUDE;
>>
>>   	perf_pmu_register(&pmu->pmu, "cpu", PERF_TYPE_RAW);
>>   }
>
>
> I see here that Atish added its RB:
> https://lore.kernel.org/linux-riscv/CAOnJCUJ-eE+zbXH0yBX_QBK2ep779q=wNCSrc+BJfzUb+zBCaw@mail.gmail.com/
>
> So I add it here (hopefully b4 won't complain, I don't know):
>
> Reviewed-by: Atish Patra <atishp@...osinc.com>

It says

NOTE: some trailers ignored due to from/email mismatches:
    ! Trailer: Reviewed-by: Atish Patra <atishp@...osinc.com>
     Msg From: Alexandre Ghiti <alex@...ti.fr>
NOTE: Rerun with -S to apply them anyway

Should show up on fixes in a bit, assuming it gets through the testing.

>
> And I'd say the fixes tag for this one is:
>
> Fixes: 9b3e150e310e ("RISC-V: Add a simple platform driver for RISC-V
> legacy perf")
>
> Thanks,
>
> Alex