linux-kernel - Re: [PATCH 07/10] perf: arm_spe: Add support for filtering on data source

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Message-ID: <20250520162243.GU412060@e132581.arm.com>
Date: Tue, 20 May 2025 17:22:43 +0100
From: Leo Yan <leo.yan@....com>
To: James Clark <james.clark@...aro.org>
Cc: Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>, Mark Rutland <mark.rutland@....com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Jonathan Corbet <corbet@....net>, Marc Zyngier <maz@...nel.org>,
	Oliver Upton <oliver.upton@...ux.dev>,
	Joey Gouly <joey.gouly@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Zenghui Yu <yuzenghui@...wei.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-perf-users@...r.kernel.org, linux-doc@...r.kernel.org,
	kvmarm@...ts.linux.dev
Subject: Re: [PATCH 07/10] perf: arm_spe: Add support for filtering on data
 source

On Tue, May 20, 2025 at 05:10:03PM +0100, Leo Yan wrote:

[...]

> If 'PMSFCR_EL1.FDS == 0 and PMSDSFR_EL1 == 0x0' is the init state, as
> you said, when user passed 0xFFFF,FFFF,FFFF,FFFF for data filter, we
> cannot distinguish it from the init state, as a result, we will fail
> to handle this case.

Correct a typo. The case above, it means "when a user passes 0x0 for
data source filter ....".

Sorry for spamming.

Leo