#!/bin/bash# 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_testarm_spe_system_wide_testarm_spe_discard_test exit $glb_err