linux-kernel - Re: [PATCH] perf cs-etm: Bump minimum OpenCSD version to ensure a bugfix is present

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Message-ID: <20230910092201.GA52362@leoy-huanghe.lan>
Date:   Sun, 10 Sep 2023 17:22:01 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     James Clark <james.clark@....com>
Cc:     linux-perf-users@...r.kernel.org,
        John Garry <john.g.garry@...cle.com>,
        Will Deacon <will@...nel.org>,
        Mike Leach <mike.leach@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf cs-etm: Bump minimum OpenCSD version to ensure a
 bugfix is present

On Fri, Sep 01, 2023 at 02:37:15PM +0100, James Clark wrote:
> Since commit d927ef5004ef ("perf cs-etm: Add exception level consistency
> check"), the exception that was added to Perf will be triggered unless
> the following bugfix from OpenCSD is present:
> 
>  - _Version 1.2.1_:
>   - __Bugfix__:
>     ETM4x / ETE - output of context elements to client can in some
>     circumstances be delayed until after subsequent atoms have been
>     processed leading to incorrect memory decode access via the client
>     callbacks. Fixed to flush context elements immediately they are
>     committed.
> 
> Rather than remove the assert and silently fail, just increase the
> minimum version requirement to avoid hard to debug issues and
> regressions.
> 
> Signed-off-by: James Clark <james.clark@....com>

Tested-by: Leo Yan <leo.yan@...aro.org>