linux-kernel - Re: [PATCH v8] libperf: Add arm64 support to perf_mmap__read

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Message-ID: <CAL_Jsq+F1x-spV4hatHLFmFHo8e4U-gf8goz69_MPihfPirTXw@mail.gmail.com>
Date:   Tue, 14 Dec 2021 16:08:35 -0600
From:   Rob Herring <robh@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>
Cc:     linux-perf-users@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH v8] libperf: Add arm64 support to perf_mmap__read_self()

On Tue, Dec 14, 2021 at 3:56 PM Rob Herring <robh@...nel.org> wrote:
>
> Add the arm64 variants for read_perf_counter() and read_timestamp().
> Unfortunately the counter number is encoded into the instruction, so the
> code is a bit verbose to enumerate all possible counters.
>
> Signed-off-by: Rob Herring <robh@...nel.org>
> ---
> v8:
>  - Set attr.config1 to request user access on arm64

Hit send a bit too quick. The kernel side[1] has now been applied by
Will, so hopefully the libperf enabling can land in 5.17 too.

Rob

[1] https://lore.kernel.org/all/163948145564.2060329.17036263207999776606.b4-ty@kernel.org/