linux-kernel - Re: [PATCH v2 7/9] perf cs-etm: Create ETE decoder

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Date:   Fri, 3 Sep 2021 10:15:07 +0100
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     James Clark <james.clark@....com>, mathieu.poirier@...aro.org,
        leo.yan@...aro.org, coresight@...ts.linaro.org,
        linux-perf-users@...r.kernel.org, mike.leach@...aro.org
Cc:     acme@...nel.org, John Garry <john.garry@...wei.com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 7/9] perf cs-etm: Create ETE decoder

On 06/08/2021 14:41, James Clark wrote:
> If the magic number indicates ETE instantiate a OCSD_BUILTIN_DCD_ETE
> decoder instead of OCSD_BUILTIN_DCD_ETMV4I. ETE is the new trace feature
> for Armv9.
> 
> Testing performed
> =================
> 
> * Old files with v0 and v1 headers for ETMv4 still open correctly
> * New files with new magic number open on new versions of perf
> * New files with new magic number fail to open on old versions of perf
> * Decoding with the ETE decoder results in the same output as the ETMv4
>    decoder as long as there are no new ETE packet types
> 
> Signed-off-by: James Clark <james.clark@....com>

Changes look good to me with my limited knowledge about the decoder
facing code.

FWIW,

Acked-by: Suzuki K Poulose <suzuki.poulose@....com>