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#!/bin/sh
# Check Arm SPE trace data recording and synthesized samples (exclusive)
# Uses the 'perf record' to record trace data of Arm SPE events;
# then verify if any SPE event samples are generated by SPE with
# 'perf script' and 'perf report' commands.
# SPDX-License-Identifier: GPL-2.0
# German Gomez <german.gomez@arm.com>, 2021
skip_if_no_arm_spe_event() {
perf list pmu | grep -E -q 'arm_spe_[0-9]+//' && return 0
# arm_spe event doesn't exist
return 2
}
skip_if_no_arm_spe_event || exit 2
perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
glb_err=0
cleanup_files()
{
rm -f ${perfdata}
rm -f ${perfdata}.old
exit $glb_err
}
trap cleanup_files EXIT TERM INT
arm_spe_report() {
if [ $2 = 0 ]; then
echo "$1: PASS"
elif [ $2 = 2 ]; then
echo "$1: SKIPPED"
else
echo "$1: FAIL"
glb_err=$2
fi
}
perf_script_samples() {
echo "Looking at perf.data file for dumping samples:"
# from arm-spe.c/arm_spe_synth_events()
events="(ld1-miss|ld1-access|llc-miss|lld-access|tlb-miss|tlb-access|branch-miss|remote-access|memory)"
# Below is an example of the samples dumping:
# dd 3048 [002] 1 l1d-access: ffffaa64999c __GI___libc_write+0x3c (/lib/aarch64-linux-gnu/libc-2.27.so)
# dd 3048 [002] 1 tlb-access: ffffaa64999c __GI___libc_write+0x3c (/lib/aarch64-linux-gnu/libc-2.27.so)
# dd 3048 [002] 1 memory: ffffaa64999c __GI___libc_write+0x3c (/lib/aarch64-linux-gnu/libc-2.27.so)
perf script -F,-time -i ${perfdata} 2>&1 | \
grep -E " +$1 +[0-9]+ .* +${events}:(.*:)? +" > /dev/null 2>&1
}
perf_report_samples() {
echo "Looking at perf.data file for reporting samples:"
# Below is an example of the samples reporting:
# 73.04% 73.04% dd libc-2.27.so [.] _dl_addr
# 7.71% 7.71% dd libc-2.27.so [.] getenv
# 2.59% 2.59% dd ld-2.27.so [.] strcmp
perf report --stdio -i ${perfdata} 2>&1 | \
grep -E " +[0-9]+\.[0-9]+% +[0-9]+\.[0-9]+% +$1 " > /dev/null 2>&1
}
arm_spe_snapshot_test() {
echo "Recording trace with snapshot mode $perfdata"
perf record -o ${perfdata} -e arm_spe// -S \
-- dd if=/dev/zero of=/dev/null > /dev/null 2>&1 &
PERFPID=$!
# Wait for perf program
sleep 1
# Send signal to snapshot trace data
kill -USR2 $PERFPID
# Stop perf program
kill $PERFPID
wait $PERFPID
perf_script_samples dd &&
perf_report_samples dd
err=$?
arm_spe_report "SPE snapshot testing" $err
}
arm_spe_system_wide_test() {
echo "Recording trace with system-wide mode $perfdata"
perf record -o - -e dummy -a -B true > /dev/null 2>&1
if [ $? != 0 ]; then
arm_spe_report "SPE system-wide testing" 2
return
fi
perf record -o ${perfdata} -e arm_spe// -a --no-bpf-event \
-- dd if=/dev/zero of=/dev/null count=100000 > /dev/null 2>&1
perf_script_samples dd &&
perf_report_samples dd
err=$?
arm_spe_report "SPE system-wide testing" $err
}
arm_spe_discard_test() {
echo "SPE discard mode"
for f in /sys/bus/event_source/devices/arm_spe_*; do
if [ -e "$f/format/discard" ]; then
cpu=$(cut -c -1 "$f/cpumask")
break
fi
done
if [ -z $cpu ]; then
arm_spe_report "SPE discard mode not present" 2
return
fi
# Test can use wildcard SPE instance and Perf will only open the event
# on instances that have that format flag. But make sure the target
# runs on an instance with discard mode otherwise we're not testing
# anything.
perf record -o ${perfdata} -e arm_spe/discard/ -N -B --no-bpf-event \
-- taskset --cpu-list $cpu true
if perf report -i ${perfdata} --stats | grep 'AUX events\|AUXTRACE events'; then
arm_spe_report "SPE discard mode found unexpected data" 1
else
arm_spe_report "SPE discard mode" 0
fi
}
arm_spe_snapshot_test
arm_spe_system_wide_test
arm_spe_discard_test
exit $glb_err
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