linux-kernel - Re: [PATCH v4 03/10] riscv: Make legacy counter enum match the HW numbering

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Message-ID: <CAOnJCULeM0TXR8mp-FihtMZ2KfOTkPzmzjX74Mj6_c62UrhAEA@mail.gmail.com>
Date:   Fri, 14 Jul 2023 01:01:01 -0700
From:   Atish Patra <atishp@...shpatra.org>
To:     Alexandre Ghiti <alexghiti@...osinc.com>
Cc:     Jonathan Corbet <corbet@....net>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Anup Patel <anup@...infault.org>,
        Will Deacon <will@...nel.org>, Rob Herring <robh@...nel.org>,
        Andrew Jones <ajones@...tanamicro.com>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 03/10] riscv: Make legacy counter enum match the HW numbering

On Mon, Jul 3, 2023 at 5:49 AM Alexandre Ghiti <alexghiti@...osinc.com> wrote:
>
> RISCV_PMU_LEGACY_INSTRET used to be set to 1 whereas the offset of this
> hardware counter from CSR_CYCLE is actually 2: make this offset match the
> real hw offset so that we can directly expose those values to userspace.
>
> Signed-off-by: Alexandre Ghiti <alexghiti@...osinc.com>
> Reviewed-by: Andrew Jones <ajones@...tanamicro.com>
> ---
>  drivers/perf/riscv_pmu_legacy.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/perf/riscv_pmu_legacy.c b/drivers/perf/riscv_pmu_legacy.c
> index ca9e20bfc7ac..6a000abc28bb 100644
> --- a/drivers/perf/riscv_pmu_legacy.c
> +++ b/drivers/perf/riscv_pmu_legacy.c
> @@ -13,7 +13,7 @@
>  #include <linux/platform_device.h>
>
>  #define RISCV_PMU_LEGACY_CYCLE         0
> -#define RISCV_PMU_LEGACY_INSTRET       1
> +#define RISCV_PMU_LEGACY_INSTRET       2
>
>  static bool pmu_init_done;
>
> --
> 2.39.2
>

Reviewed-by: Atish Patra <atishp@...osinc.com>

-- 
Regards,
Atish