Good day Joey,

I can spot several problems with your manipulations - please see below. I also suggest to CC the coresight mailing list when looking for support.

On Tue, 10 Dec 2019 at 00:44, Joey Jiao notifications@github.com wrote:

Hi, I have a arm64 device, perf list pmu

List of pre-defined events (to be used in -e): cs_etm// [Kernel PMU event]

However I cannot run perf record -e cs_etm successfully.

can you help? ls /sys/bus/coresight/devices/|grep coresight-etm

coresight-etm0 coresight-etm1 coresight-etm2 coresight-etm3 coresight-etm4 coresight-etm5 coresight-etm6 coresight-etm7

We will need a full list of all the CS devices on your system. Just listing the ETMs is not sufficient.

#2 https://github.com/Linaro/perf-opencsd/issues/2 ls -l /sys/bus/coresight/devices/coresight-etm0 lrwxrwxrwx. 1 root root 0 Dec 7 16:58 /sys/bus/coresight/devices/coresight-etm0 -> ../../../devices/platform/soc/7040000.etm/coresight-etm0 perf record -e cs_etm ls

event syntax error: 'cs_etm' ___ parser error Run 'perf list' for a list of valid events

Usage: perf record [] [] or: perf record [] -- []

-e, --event <event> event selector. use 'perf list' to list available events

Yes, that is the expected behavior. On systems with a 1:N topology a sink needs to be specified. System with 1:1 topologies aren't supported, hence the request to see all the CS devices on your system (above).

perf record -e cs_etm/7040000.etm/ ls

event syntax error: 'cs_etm/7040000.etm/' ___ parser error Run 'perf list' for a list of valid events

Usage: perf record [] [] or: perf record [] -- []

-e, --event <event> event selector. use 'perf list' to list available events

Also incorrect. First the sink needs to be preceded by '@' and actually be a sink - here you have specified a source. Before going further I advise you to spend some time in the documentation [1].

Thanks, Mathieu

[1]. https://elixir.bootlin.com/linux/v5.5-rc1/source/Documentation/trace/coresig...

perf record -e cs_etm/@7040000.etm/ ls

failed to set config "7040000.etm" on event cs_etm/@7040000.etm/ with 2 (No such file or directory)

I can cat /dev/coresight-tmc-etr > dump.bin after enabled ETM, but perf

doesn't work as above stated.

Thanks

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