CoreSight April 2020

coresight@lists.linaro.org

16 participants
22 discussions

[RFC]Disable enabled coresight path when device on the path is removed

by tingwei＠codeaurora.org

Hi Mathieu and Suzuki, I'm working a patch set to support building coresight drivers as loadable modules. The main gap is handling dynamicly unload module when there's some enabled coresight path. I tried to disable all the enabled coresight paths when device driver calls coresight_unregister() and free that path. In this case, there will be no access to the structures that have been freed after removing the device. This works fine with sysfs use case. I use one script to unload/load coresight module continuously and another script to enable/disable coresight sink/source continuously. There're no Kernel panic. I'm not really familiar with perf side since most of my work is on sysfs side. I'd like to know your opinion whether we can do similar thing on perf use case.Base on my limit understanding on perf etm module, I have some basic ideas. 1.Record the new perf event to a global list. 2.Record enabled perf event to per_cpu variable since there's only one enabled event on one CPU. 3.Make a call from coresight_unregister() to perf_etm to clean up. 4.Go through enabled perf events and disable them when device on their path is removed. 5.Go through global events list and remove all the events with removed device on their path. I'm seeking for the correct way to disable perf event and remove them from etm_perf driver.I'm also thinking about the correct lock to avoid racing. Thanks, Tingwei

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CoreSight April 2020