linux-kernel - Re: [PATCH] coresight: tmc-etr: Don't enable ETR when it's not ready

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Message-ID: <8200e62a-0038-ae83-4c94-5059110d448e@arm.com>
Date:   Wed, 25 Jan 2023 10:21:09 +0000
From:   James Clark <james.clark@....com>
To:     Yabin Cui <yabinc@...gle.com>,
        Suzuki K Poulose <suzuki.poulose@....com>
Cc:     Mike Leach <mike.leach@...aro.org>, coresight@...ts.linaro.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Leo Yan <leo.yan@...aro.org>
Subject: Re: [PATCH] coresight: tmc-etr: Don't enable ETR when it's not ready



On 24/01/2023 20:09, Yabin Cui wrote:
> Ping for review. And I still can't reproduce it, even if I reduced the
> timeout to 2us and tried different workloads. Any suggestions for how
> to reproduce it?
> 

Hi Yabin,

I just found this in my kernel log files from a few days ago.

Jan 19 15:03:35 n1-sdp kernel: [865337.521413] coresight tmc_etr0:
timeout while waiting for completion of Manual Flush
Jan 19 15:03:35 n1-sdp kernel: [865337.529351] coresight tmc_etr0:
timeout while waiting for TMC to be Ready

This is on N1SDP, and I've only been running "normal" perf commands like:

  perf record -e cs_etm//k --  taskset -c 2 sleep 1
  perf record -e cs_etm//  -- stress -c 2 -t 1

I also haven't been able to reproduce it since

James