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#!/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()
{
echo "Checking for CPU-wide recording on CPU $1"
if ! perf record -o "${tmpfile}" -B -N --no-bpf-event -e dummy:u -C "$1" true >/dev/null 2>&1 ; then
echo "No so skipping"
return 2
fi
echo OK
return 0
}
test_system_wide_side_band()
{
echo "--- Test system-wide sideband ---"
# 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
echo OK
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
echo "--- Done ---"
if [ ${err_cnt} -gt 0 ] ; then
exit 1
fi
if [ ${ok_cnt} -gt 0 ] ; then
exit 0
fi
exit 2
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