linux/tools/perf/tests/shell/test_intel_pt.sh

#!/bin/sh
# Miscellaneous Intel PT testing
# SPDX-License-Identifier: GPL-2.0

set -e

# Skip if no Intel PT
perf list | grep -q 'intel_pt//' || exit 2

skip_cnt=0
ok_cnt=0
err_cnt=0

temp_dir=$(mktemp -d /tmp/perf-test-intel-pt-sh.XXXXXXXXXX)

tmpfile="${temp_dir}/tmp-perf.data"
perfdatafile="${temp_dir}/test-perf.data"

cleanup()
{
	trap - EXIT TERM INT
	sane=$(echo "${temp_dir}" | cut -b 1-26)
	if [ "${sane}" = "/tmp/perf-test-intel-pt-sh" ] ; then
		echo "--- Cleaning up ---"
		rm -f "${temp_dir}/"*
		rmdir "${temp_dir}"
	fi
}

trap_cleanup()
{
	cleanup
	exit 1
}

trap trap_cleanup EXIT TERM INT

can_cpu_wide()
{
	perf record -o "${tmpfile}" -B -N --no-bpf-event -e dummy:u -C "$1" true >/dev/null 2>&1 || return 2
	return 0
}

test_system_wide_side_band()
{
	# Need CPU 0 and CPU 1
	can_cpu_wide 0 || return $?
	can_cpu_wide 1 || return $?

	# Record on CPU 0 a task running on CPU 1
	perf record -B -N --no-bpf-event -o "${perfdatafile}" -e intel_pt//u -C 0 -- taskset --cpu-list 1 uname

	# Should get MMAP events from CPU 1 because they can be needed to decode
	mmap_cnt=$(perf script -i "${perfdatafile}" --no-itrace --show-mmap-events -C 1 2>/dev/null | grep -c MMAP)

	if [ "${mmap_cnt}" -gt 0 ] ; then
		return 0
	fi

	echo "Failed to record MMAP events on CPU 1 when tracing CPU 0"
	return 1
}

count_result()
{
	if [ "$1" -eq 2 ] ; then
		skip_cnt=$((skip_cnt + 1))
		return
	fi
	if [ "$1" -eq 0 ] ; then
		ok_cnt=$((ok_cnt + 1))
		return
	fi
	err_cnt=$((err_cnt + 1))
	ret=0
}

ret=0
test_system_wide_side_band || ret=$? ; count_result $ret

cleanup

if [ ${err_cnt} -gt 0 ] ; then
	exit 1
fi

if [ ${ok_cnt} -gt 0 ] ; then
	exit 0
fi

exit 2