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