linux-kernel - Re: [PATCH v13 0/5] arm64 userspace counter support

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Message-Id: <163948145564.2060329.17036263207999776606.b4-ty@kernel.org>
Date:   Tue, 14 Dec 2021 14:04:35 +0000
From:   Will Deacon <will@...nel.org>
To:     Mark Rutland <mark.rutland@....com>, Rob Herring <robh@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     catalin.marinas@....com, kernel-team@...roid.com,
        Will Deacon <will@...nel.org>, Borislav Petkov <bp@...en8.de>,
        Vince Weaver <vincent.weaver@...ne.edu>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jonathan Corbet <corbet@....net>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        linux-arm-kernel@...ts.infradead.org,
        Namhyung Kim <namhyung@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        linux-perf-users@...r.kernel.org
Subject: Re: [PATCH v13 0/5] arm64 userspace counter support

On Wed, 8 Dec 2021 14:11:19 -0600, Rob Herring wrote:
> Another version of arm64 userspace counter access support. No changes from
> the last version except rebasing and rewriting a commit message.
> 
> The arm64 support departs from the x86 implementation by requiring the user
> to explicitly request user access (via attr.config1) and only enables access
> for task bound events. Since usage is explicitly requested, access is
> enabled at perf_event_open() rather than on mmap() as that greatly
> simplifies the implementation. Rather than trying to lock down the access
> as the x86 implementation has been doing, we can start with only a limited
> use case enabled and later expand it if needed.
> 
> [...]

Applied to will (for-next/perf-user-counter-access), thanks!

[1/5] x86: perf: Move RDPMC event flag to a common definition
      https://git.kernel.org/arm64/c/369461ce8fb6
[2/5] perf: Add a counter for number of user access events in context
      https://git.kernel.org/arm64/c/82ff0c022d19
[3/5] arm64: perf: Add userspace counter access disable switch
      https://git.kernel.org/arm64/c/e2012600810c
[4/5] arm64: perf: Enable PMU counter userspace access for perf event
      https://git.kernel.org/arm64/c/83a7a4d643d3
[5/5] Documentation: arm64: Document PMU counters access from userspace
      https://git.kernel.org/arm64/c/aa1005d15d2a

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev