linux-kernel - Re: [PATCH v3 8/8] perf: arm_spe: Add support for SPEv1.2 inverted event filtering

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Message-ID: <CAM9d7ciYabTpo0q5Z8h229dZ+RXG7JP1zgOoR1fgdZZCH87vow@mail.gmail.com>
Date:   Mon, 7 Nov 2022 11:48:23 -0800
From:   Namhyung Kim <namhyung@...nel.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Will Deacon <will@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Marc Zyngier <maz@...nel.org>,
        Oliver Upton <oliver.upton@...ux.dev>,
        Ingo Molnar <mingo@...hat.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        James Morse <james.morse@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        kvmarm@...ts.linux.dev, linux-perf-users@...r.kernel.org,
        linux-kernel@...r.kernel.org, James Clark <james.clark@....com>,
        Mark Brown <broonie@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu
Subject: Re: [PATCH v3 8/8] perf: arm_spe: Add support for SPEv1.2 inverted
 event filtering

Hello,

On Fri, Nov 4, 2022 at 8:55 AM Rob Herring <robh@...nel.org> wrote:
>
> Arm SPEv1.2 (Arm v8.7/v9.2) adds a new feature called Inverted Event
> Filter which excludes samples matching the event filter. The feature
> mirrors the existing event filter in PMSEVFR_EL1 adding a new register,
> PMSNEVFR_EL1, which has the same event bit assignments.

Just out of curiosity, is it possible to have the event filter and
inverted filter at the same time?  What if they have the same?

Thanks,
Namhyung

>
> Tested-by: James Clark <james.clark@....com>
> Signed-off-by: Rob Herring <robh@...nel.org>
> ---
> v3:
>  - No change
> v2:
>  - Update for auto generated register defines
>  - Avoid accessing SYS_PMSNEVFR_EL1 on < v8.7
> ---