linux-kernel - Re: [PATCH v2 05/10] riscv: Prepare for user-space perf event mmap support

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Message-ID: <20230531-107c91fd5c1926f7c8a2a25d@orel>
Date:   Wed, 31 May 2023 16:24:16 +0200
From:   Andrew Jones <ajones@...tanamicro.com>
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>,
        Atish Patra <atishp@...shpatra.org>,
        Anup Patel <anup@...infault.org>,
        Will Deacon <will@...nel.org>, Rob Herring <robh@...nel.org>,
        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 v2 05/10] riscv: Prepare for user-space perf event mmap
 support

On Fri, May 12, 2023 at 10:53:16AM +0200, Alexandre Ghiti wrote:
> Provide all the necessary bits in the generic riscv pmu driver to be
> able to mmap perf events in userspace: the heavy lifting lies in the
> driver backend, namely the legacy and sbi implementations.
> 
> Note that arch_perf_update_userpage is almost a copy of arm64 code.
> 
> Signed-off-by: Alexandre Ghiti <alexghiti@...osinc.com>
> ---
>  arch/riscv/kernel/Makefile     |  2 +-
>  arch/riscv/kernel/perf_event.c | 58 ++++++++++++++++++++++++++++++++++
>  drivers/perf/riscv_pmu.c       | 41 ++++++++++++++++++++++++
>  include/linux/perf/riscv_pmu.h |  4 +++
>  4 files changed, 104 insertions(+), 1 deletion(-)
>  create mode 100644 arch/riscv/kernel/perf_event.c
>

Reviewed-by: Andrew Jones <ajones@...tanamicro.com>