linux-kernel - [PATCH v4 0/1] perf: cs_etm: Allow no sink on command line.

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Message-Id: <20200526105310.9706-1-mike.leach@linaro.org>
Date:   Tue, 26 May 2020 11:53:09 +0100
From:   Mike Leach <mike.leach@...aro.org>
To:     linux-arm-kernel@...ts.infradead.org, coresight@...ts.linaro.org,
        linux-kernel@...r.kernel.org, acme@...nel.org
Cc:     mathieu.poirier@...aro.org, suzuki.poulose@....com,
        peterz@...radead.org, mingo@...hat.com,
        Mike Leach <mike.leach@...aro.org>
Subject: [PATCH v4 0/1] perf: cs_etm: Allow no sink on command line.

Currently starting CoreSight tracing using perf requires a sink selection
on the command line:-

sudo ./perf record -e cs_etm/@..._etr0/ --per-thread uname -a

Not providing the @<sink> here results in an error and no trace produced.

After this set (alongside the CoreSight change set [1]) the infrastructure
will be able to select a default sink:-

sudo ./perf record -e cs_etm// --per-thread uname -a

This matches with the default operation provided with perf and intelpt.

This patch removes the check that a sink value is provided on the command
line with a NULL value passed to the CoreSight infrastructure if omitted.

Note: If this set is applied to a system without [1], then the effect is
benign as the existing CoreSight infrastructure will detect the error and
refuse to trace.

Applies to Linux coresight/next branch

[1] http://lists.infradead.org/pipermail/linux-arm-kernel/2020-May/734854.html

Changes since v3:
1) Removed RFC designation and distributed to wider audience.
2) Split set into perf user runtime (this set), and CoreSight driver code.

Mike Leach (1):
  perf: cs-etm: Allow no CoreSight sink to be specified on command line

 tools/perf/arch/arm/util/cs-etm.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

-- 
2.17.1