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

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Date: Tue, 27 Feb 2024 20:26:20 +0100
From: Alexandre Ghiti <alex@...ti.fr>
To: Vadim Shakirov <vadim.shakirov@...tacore.com>,
 linux-riscv@...ts.infradead.org
Cc: Atish Patra <atishp@...shpatra.org>, Anup Patel <anup@...infault.org>,
 Will Deacon <will@...nel.org>, Mark Rutland <mark.rutland@....com>,
 Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt
 <palmer@...belt.com>, Albert Ou <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 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>

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