We need a simple method to test Perf with Arm CoreSight drivers, this could be used for smoke testing when new patch is coming for perf or CoreSight drivers, and we also can use the test to confirm if the CoreSight has been enabled successfully on new platforms.

This patch introduces the shell script test_arm_coresight.sh which is under the 'pert test' framework. This script provides three testing scenarios:

Test scenario 1: traverse all possible paths between source and sink

For traversing possible paths, simply to say, the testing rationale is source oriented testing, it traverses every source (now only refers to ETM device) and test its all possible sinks. To search the complete paths from one specific source to its sinks, this patch relies on the sysfs '/sys/bus/coresight/devices/devX/out:Y' for depth-first search (DFS) for iteration connected device nodes, if the output device is detected as one of ETR, ETF, or ETB types then it will test trace data recording and decoding for this PMU device.

The script runs three output testings for every trace data: - Test branch samples dumping with 'perf script' command; - Test branch samples reporting with 'perf report' command; - Use option '--itrace=i1000i' to insert synthesized instructions events and the script will check if perf can output the percentage value successfully based on the instruction samples.

Test scenario 2: CPU wide mode test

For CPU wide mode testing, it passes option '-a' to perf tool to enable tracing on all CPUs, so it's hard to say which program will be traced. But perf tool itself contributes much overload in this case, so it will parse trace data and check if process 'perf' can be detected or not.

Test scenario 3: snapshot mode test.

For snapshot mode testing, it uses 'dd' command to launch a long running program, so this can give chance to send signal -USR2; it will check the captured trace data contains 'dd' related thread info or not.

If any test fails, it will report failure and directly exit with error. This test will be only applied on a platform with PMU event 'cs_etm//', otherwise will skip the testing.

Below is detailed usage for it:

# cd $linux/tools/perf -> This is important so can use shell script # perf test list [...] 65: probe libc's inet_pton & backtrace it with ping 66: Check Arm CoreSight trace data recording and branch samples 67: Check open filename arg using perf trace + vfs_getname 68: Zstd perf.data compression/decompression 69: Add vfs_getname probe to get syscall args filenames 70: Use vfs_getname probe to get syscall args filenames

# perf test 66 66: Check Arm CoreSight trace data recording and branch samples: Ok

Signed-off-by: Leo Yan leo.yan@linaro.org --- tools/perf/tests/shell/test_arm_coresight.sh | 172 +++++++++++++++++++ 1 file changed, 172 insertions(+) create mode 100755 tools/perf/tests/shell/test_arm_coresight.sh

diff --git a/tools/perf/tests/shell/test_arm_coresight.sh b/tools/perf/tests/shell/test_arm_coresight.sh new file mode 100755 index 000000000000..73b973bada26 --- /dev/null +++ b/tools/perf/tests/shell/test_arm_coresight.sh @@ -0,0 +1,172 @@ +#!/bin/sh +# Check Arm CoreSight trace data recording and branch samples + +# Uses the 'perf record' to record trace data with Arm CoreSight sinks; +# then verify if there have any branch samples and instruction samples +# are generated by CoreSight with 'perf script' and 'perf report' +# commands. + +# SPDX-License-Identifier: GPL-2.0 +# Leo Yan leo.yan@linaro.org, 2020 + +perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX) +file=$(mktemp /tmp/temporary_file.XXXXX) + +skip_if_no_cs_etm_event() { + perf list | grep -q 'cs_etm//' && return 0 + + # cs_etm event doesn't exist + return 2 +} + +skip_if_no_cs_etm_event || exit 2 + +record_touch_file() { + echo "Recording trace (only user mode) with path: CPU$2 => $1" + perf record -o ${perfdata} -e cs_etm/@$1/u --per-thread \ + -- taskset -c $2 touch $file +} + +perf_script_branch_samples() { + echo "Looking at perf.data file for dumping branch samples:" + + # Below is an example of the branch samples dumping: + # touch 6512 1 branches:u: ffffb220824c strcmp+0xc (/lib/aarch64-linux-gnu/ld-2.27.so) + # touch 6512 1 branches:u: ffffb22082e0 strcmp+0xa0 (/lib/aarch64-linux-gnu/ld-2.27.so) + # touch 6512 1 branches:u: ffffb2208320 strcmp+0xe0 (/lib/aarch64-linux-gnu/ld-2.27.so) + perf script -F,-time -i ${perfdata} | \ + egrep " +$1 +[0-9]+ .* +branches:([u|k]:)? +" +} + +perf_report_branch_samples() { + echo "Looking at perf.data file for reporting branch samples:" + + # Below is an example of the branch samples reporting: + # 73.04% 73.04% touch libc-2.27.so [.] _dl_addr + # 7.71% 7.71% touch libc-2.27.so [.] getenv + # 2.59% 2.59% touch ld-2.27.so [.] strcmp + perf report --stdio -i ${perfdata} | \ + egrep " +[0-9]+.[0-9]+% +[0-9]+.[0-9]+% +$1 " +} + +perf_report_instruction_samples() { + echo "Looking at perf.data file for instruction samples:" + + # Below is an example of the instruction samples reporting: + # 68.12% touch libc-2.27.so [.] _dl_addr + # 5.80% touch libc-2.27.so [.] getenv + # 4.35% touch ld-2.27.so [.] _dl_fixup + perf report --itrace=i1000i --stdio -i ${perfdata} | \ + egrep " +[0-9]+.[0-9]+% +$1" +} + +arm_cs_iterate_devices() { + for dev in $1/connections/out:*; do + + # Skip testing if it's not a directory + ! [ -d $dev ] && continue; + + # Read out its symbol link file name + path=`readlink -f $dev` + + # Extract device name from path, e.g. + # path = '/sys/devices/platform/20010000.etf/tmc_etf0' + # `> device_name = 'tmc_etf0' + device_name=`echo $path | awk -F/ '{print $(NF)}'` + + echo $device_name | egrep -q "etr|etb|etf" + + # Only test if the output device is ETR/ETB/ETF + if [ $? -eq 0 ]; then + + pmu_dev="/sys/bus/event_source/devices/cs_etm/sinks/$device_name" + + # Exit if PMU device node doesn't exist + if ! [ -f $pmu_dev ]; then + echo "PMU device $pmu_dev doesn't exist" + exit 1 + fi + + record_touch_file $device_name $2 && + perf_script_branch_samples touch && + perf_report_branch_samples touch && + perf_report_instruction_samples touch + + err=$? + + # Exit when find failure + [ $err != 0 ] && exit $err + + rm -f ${perfdata} + rm -f ${file} + fi + + arm_cs_iterate_devices $dev $2 + done +} + +arm_cs_etm_traverse_path_test() { + # Iterate for every ETM device + for dev in /sys/bus/coresight/devices/etm*; do + + # Find the ETM device belonging to which CPU + cpu=`cat $dev/cpu` + + echo $dev + echo $cpu + + # Use depth-first search (DFS) to iterate outputs + arm_cs_iterate_devices $dev $cpu + done +} + +arm_cs_etm_cpu_wide_test() { + echo "Recording trace with CPU wide mode" + perf record -o ${perfdata} -e cs_etm// -a -- ls + + perf_script_branch_samples perf && + perf_report_branch_samples perf && + perf_report_instruction_samples perf + + err=$? + + # Exit when find failure + [ $err != 0 ] && exit $err + + rm -f ${perfdata} + rm -f ${file} +} + +arm_cs_etm_snapshot_test() { + echo "Recording trace with snapshot mode" + perf record -o ${perfdata} -e cs_etm// -S --per-thread \ + -- dd if=/dev/zero of=/dev/null & + PERFPID=$! + + # Wait for perf program + sleep 1 + + # Send signal to snapshot trace data + kill -USR2 $PERFPID + + # Stop perf program + kill $PERFPID + wait $PERFPID + + perf_script_branch_samples dd && + perf_report_branch_samples dd && + perf_report_instruction_samples dd + + err=$? + + # Exit when find failure + [ $err != 0 ] && exit $err + + rm -f ${perfdata} + rm -f ${file} +} + +arm_cs_etm_traverse_path_test +arm_cs_etm_cpu_wide_test +arm_cs_etm_snapshot_test +exit 0