linux-kernel - Re: [PATCH 5/7] perf cs-etm: Don't use hard coded config bits when setting up TRCCONFIGR

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Message-ID: <20251202120147.GW724103@e132581.arm.com>
Date: Tue, 2 Dec 2025 12:01:47 +0000
From: Leo Yan <leo.yan@....com>
To: James Clark <james.clark@...aro.org>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Mike Leach <mike.leach@...aro.org>,
	John Garry <john.g.garry@...cle.com>, Will Deacon <will@...nel.org>,
	Leo Yan <leo.yan@...ux.dev>, linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org, coresight@...ts.linaro.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 5/7] perf cs-etm: Don't use hard coded config bits when
 setting up TRCCONFIGR

On Mon, Dec 01, 2025 at 04:41:08PM +0000, Coresight ML wrote:
> Perf only looks at attr.config when determining what was programmed into
> TRCCONFIGR. These bits could theoretically be in any of the config
> fields. Use the evsel__get_config_val() helper so it's agnostic to
> which config field they are in.
> 
> The kernel will also stop publishing the TRCCONFIGR register bits in a
> header [1] so preempt that by defining them here.
> 
> [1]: https://lore.kernel.org/linux-arm-kernel/20251128-james-cs-syncfreq-v8-10-4d319764cc58@linaro.org/
> Signed-off-by: James Clark <james.clark@...aro.org>

Reviewed-by: Leo Yan <leo.yan@....com>