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#!/bin/bash -e
# CoreSight raw dump stress (exclusive)
# SPDX-License-Identifier: GPL-2.0
if [ "$(id -u)" != 0 ]; then
# Requires root for larger buffer size
echo "[Skip] No root permission"
exit 2
fi
# If CoreSight is not available, skip the test
perf list pmu | grep -q cs_etm || exit 2
tmpdir=$(mktemp -d /tmp/__perf_test.coresight_raw_dump_stress.XXXXX)
cleanup() {
rm -r "${tmpdir}"
trap - EXIT TERM INT
}
trap_cleanup() {
cleanup
exit 1
}
trap trap_cleanup EXIT TERM INT
# Use exit snapshot to record 2M of trace to make about 80MB of raw dump data.
echo "Recording..."
perf record -e cs_etm/timestamp=0/u -m,2M -Se -o "$tmpdir/data" -- \
perf test -w brstack 20000 > /dev/null 2>&1
# Test raw dump runs to completion but don't decode because that's too slow for
# a test
echo "Dumping raw trace..."
perf report --dump-raw-trace -i "$tmpdir/data" 2>/dev/null > "$tmpdir/rawdump"
# Get the size and offset of the first AUXTRACE buffer and the index of the last
# packet in the raw dump.
read -r size offset last_idx <<< "$(awk '
found && /PERF_RECORD_/ { exit }
/PERF_RECORD_AUXTRACE / { found = 1; size = $7; offset = $9; next }
found && /Idx:/ { last_idx = $1; gsub(/Idx:|;/, "", last_idx) }
END { if (last_idx) print size, offset, last_idx }
' "$tmpdir/rawdump")"
# The last Idx minus start offset should equal the size of the buffer if
# everything was dumped. Allow 48 bytes difference to cover 3 frames: current
# frame length, a partial frame and a final empty one, all of which aren't
# dumped.
#
# TODO: for a single snapshot, offset should always be zero. However, we
# currently output AUX records in snapshot mode when we shouldn't, which
# increments the offset. Allow for that until it's fixed so we can test raw
# dumping.
decode_size=$((1 + last_idx - offset))
if [ "$decode_size" -gt "$((size - 48))" ] && [ "$decode_size" -le "$((size))" ]; then
echo "PASS: AUXTRACE buffer length matches dumped packet index"
cleanup
exit 0
fi
echo "FAIL: AUXTRACE buffer length mismatch: size=$size offset=$offset last_idx=$last_idx decode_size=$decode_size"
cleanup
exit 1
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