On Wed, 11 Dec 2019 at 18:01, Joey Jiao <notifications@github.com> wrote:

Another point is I cannot see any sink here:

ls -l /sys/bus/event_source/devices


Please stop using different fonts in your email - it is very hard to read.

Here is the output I get on my reference platform:

root@linaro-developer:/sys/bus/event_source/devices/cs_etm# ls
cpu0  cpu3  format                      power      type
cpu1  cpu4  nr_addr_filters             sinks      uevent
cpu2  cpu5  perf_event_mux_interval_ms  subsystem

You should have a "sinks" directory in there where all the sinks are listed.  If you don't the kernel you are using is either too old, the DTB isn't describing sinks correctly, the extra set of patches that were added on top of (whatever) tree you are using is incomplete or a mix of those.

I suggest you purchase a dragonboard 410c and see how coresight works on a mainline kernel on that platform.  From there you'll be able to troubleshoot your way backward on your current platform.  Last but not least and to repeat my advice from a previous email, please spend time to really understand the documentation available on a v5.4 kernel - it will make your life (and mine) a lot easier.  If there is something in there that is not clear or needs more details, send us a patch and it will be our pleasure to consider it.

/cs_etm/ total 0
lrwxrwxrwx. 1 root root 0 Dec 8 13:00 cpu0 -> ../platform/soc/7040000.etm/coresight-etm0 lrwxrwxrwx. 1 root root 0 Dec 8 13:00 cpu1 -> ../platform/soc/7140000.etm/coresight-etm1 lrwxrwxrwx. 1 root root 0 Dec 8 13:00 cpu2 -> ../platform/soc/7240000.etm/coresight-etm2
lrwxrwxrwx. 1 root root 0 Dec 8 13:00 cpu3 -> ../platform/soc/7340000.etm/coresight-etm3
lrwxrwxrwx. 1 root root 0 Dec 8 13:00 cpu4 -> ../platform/soc/7440000.etm/coresight-etm4
lrwxrwxrwx. 1 root root 0 Dec 8 13:00 cpu5 -> ../platform/soc/7540000.etm/coresight-etm5 lrwxrwxrwx. 1 root root 0 Dec 8 13:00 cpu6 -> ../platform/soc/7640000.etm/coresight-etm6
lrwxrwxrwx. 1 root root 0 Dec 8 13:00 cpu7 -> ../platform/soc/7740000.etm/coresight-etm7
drwxr-xr-x. 2 root root 0 Dec 8 12:58 format
-r--r--r--. 1 root root 4096 Dec 8 12:58 nr_addr_filters -rw-r--r--. 1 root root 4096 Dec 8 13:00 perf_event_mux_interval_ms
drwxr-xr-x. 2 root root 0 Dec 8 13:00 power lrwxrwxrwx. 1 root root 0 Dec 8 13:00 subsystem -> ../../bus/event_source -r--r--r--. 1 root root 4096 Dec 8 12:58 type

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