Update the documentation to reflect the new naming scheme with latest changes.
Reported-by: Leo Yan <[email protected]> Cc: Mathieu Poirier <[email protected]> Cc: Jonathan Corbet <[email protected]> Signed-off-by: Suzuki K Poulose <[email protected]> --- Documentation/trace/coresight.txt | 34 +++++++++++++++++++--------------- 1 file changed, 19 insertions(+), 15 deletions(-) diff --git a/Documentation/trace/coresight.txt b/Documentation/trace/coresight.txt index efbc832..7b427cf 100644 --- a/Documentation/trace/coresight.txt +++ b/Documentation/trace/coresight.txt @@ -326,16 +326,20 @@ amount of processor cores), the "cs_etm" PMU will be listed only once. A Coresight PMU works the same way as any other PMU, i.e the name of the PMU is listed along with configuration options within forward slashes '/'. Since a Coresight system will typically have more than one sink, the name of the sink to -work with needs to be specified as an event option. Names for sink to choose -from are listed in sysFS under ($SYSFS)/bus/coresight/devices: +work with needs to be specified as an event option. +On newer kernels the available sinks are listed in sysFS under: +($SYSFS)/bus/event_source/devices/cs_etm/sinks/ - root@linaro-nano:~# ls /sys/bus/coresight/devices/ - 20010000.etf 20040000.funnel 20100000.stm 22040000.etm - 22140000.etm 230c0000.funnel 23240000.etm 20030000.tpiu - 20070000.etr 20120000.replicator 220c0000.funnel - 23040000.etm 23140000.etm 23340000.etm + root@localhost:/sys/bus/event_source/devices/cs_etm/sinks# ls + tmc_etf0 tmc_etr0 tpiu0 - root@linaro-nano:~# perf record -e cs_etm/@20070000.etr/u --per-thread program +On older kernels, this may need to be found from the list of coresight devices, +available under ($SYSFS)/bus/coresight/devices/: + + root@localhost:/sys/bus/coresight/devices# ls + etm0 etm1 etm2 etm3 etm4 etm5 funnel0 funnel1 funnel2 replicator0 stm0 tmc_etf0 tmc_etr0 tpiu0 + + root@linaro-nano:~# perf record -e cs_etm/@tmc_etr0/u --per-thread program The syntax within the forward slashes '/' is important. The '@' character tells the parser that a sink is about to be specified and that this is the sink @@ -352,7 +356,7 @@ perf can be used to record and analyze trace of programs. Execution can be recorded using 'perf record' with the cs_etm event, specifying the name of the sink to record to, e.g: - perf record -e cs_etm/@20070000.etr/u --per-thread + perf record -e cs_etm/@tmc_etr0/u --per-thread The 'perf report' and 'perf script' commands can be used to analyze execution, synthesizing instruction and branch events from the instruction trace. @@ -381,7 +385,7 @@ sort example is from the AutoFDO tutorial (https://gcc.gnu.org/wiki/AutoFDO/Tuto Bubble sorting array of 30000 elements 5910 ms - $ perf record -e cs_etm/@20070000.etr/u --per-thread taskset -c 2 ./sort + $ perf record -e cs_etm/@tmc_etr0/u --per-thread taskset -c 2 ./sort Bubble sorting array of 30000 elements 12543 ms [ perf record: Woken up 35 times to write data ] @@ -405,7 +409,7 @@ than the program flow through the code. As with any other CoreSight component, specifics about the STM tracer can be found in sysfs with more information on each entry being found in [1]: -root@genericarmv8:~# ls /sys/bus/coresight/devices/20100000.stm +root@genericarmv8:~# ls /sys/bus/coresight/devices/stm0 enable_source hwevent_select port_enable subsystem uevent hwevent_enable mgmt port_select traceid root@genericarmv8:~# @@ -413,14 +417,14 @@ root@genericarmv8:~# Like any other source a sink needs to be identified and the STM enabled before being used: -root@genericarmv8:~# echo 1 > /sys/bus/coresight/devices/20010000.etf/enable_sink -root@genericarmv8:~# echo 1 > /sys/bus/coresight/devices/20100000.stm/enable_source +root@genericarmv8:~# echo 1 > /sys/bus/coresight/devices/tmc_etf0/enable_sink +root@genericarmv8:~# echo 1 > /sys/bus/coresight/devices/stm0/enable_source From there user space applications can request and use channels using the devfs interface provided for that purpose by the generic STM API: -root@genericarmv8:~# ls -l /dev/20100000.stm -crw------- 1 root root 10, 61 Jan 3 18:11 /dev/20100000.stm +root@genericarmv8:~# ls -l /dev/stm0 +crw------- 1 root root 10, 61 Jan 3 18:11 /dev/stm0 root@genericarmv8:~# Details on how to use the generic STM API can be found here [2]. -- 2.7.4
