[PATCH v2 14/14] perf cs-etm: Test multiple per-thread threads

Launch something that has multiple child threads, attach to it and
make sure that all child threads are present in the samples

Signed-off-by: James Clark <[email protected]>
---
 .../perf/tests/shell/coresight/per-thread-multi.sh | 78 ++++++++++++++++++++++
 1 file changed, 78 insertions(+)

diff --git a/tools/perf/tests/shell/coresight/per-thread-multi.sh b/tools/perf/tests/shell/coresight/per-thread-multi.sh
new file mode 100755
index 000000000000..ea525ed5e18b
--- /dev/null
+++ b/tools/perf/tests/shell/coresight/per-thread-multi.sh
@@ -0,0 +1,78 @@
+#!/bin/bash -e
+# CoreSight per-thread multiple threads (exclusive)
+
+# SPDX-License-Identifier: GPL-2.0
+
+# If CoreSight is not available, skip the test
+perf list pmu | grep -q cs_etm || exit 2
+
+if ! tmpdir=$(mktemp -d /tmp/perf-cs-callchain-test.XXXXXX); then
+	echo "mktemp failed"
+	exit 1
+fi
+
+cleanup_files()
+{
+	if [[ $parent ]]; then
+		kill -9 $parent
+		wait $parent || true
+	fi
+	if [[ $perf ]]; then
+		kill -9 $perf
+		wait $perf || true
+	fi
+	rm -rf "$tmpdir"
+	trap - EXIT TERM INT
+}
+
+trap cleanup_files EXIT
+trap 'cleanup_files; exit 1' TERM INT
+
+# Launch 2 threads to run indefinitely
+nthreads=2
+perf test -w named_threads $nthreads 0 &
+parent=$!
+
+# While parent still exists, wait for the 2 children to spawn
+while kill -0 "$parent" 2>/dev/null; do
+  threads=(/proc/"$parent"/task/*)
+
+  if (( ${#threads[@]} >= $(($nthreads + 1)))); then
+    break
+  fi
+
+  sleep 0.1
+done
+
+echo "Recording..."
+perf record -o "$tmpdir/data" -e cs_etm//u --per-thread -Se -m,64K --pid $parent > /dev/null 2>&1 &
+perf=$!
+
+sleep 1
+
+kill $parent
+wait $parent || true
+unset parent
+wait $perf
+unset perf
+
+echo "Decoding..."
+perf script -i "$tmpdir/data" > "$tmpdir/script" 2>/dev/null
+
+# Exit early unless there is a dedicated sink per core which only TRBE
+# guarantees. This is because shared sinks will report BUSY if two threads try
+# to use them at the same time
+if ! ls /sys/bus/coresight/devices/trbe* > /dev/null 2>&1; then
+	echo "No TRBE sinks, skipping output validation"
+	exit 0
+fi
+
+# Check all threads were traced and they have the correct thread name and symbol
+for i in $(seq 1 $nthreads); do
+	if ! grep -q "thread${i} .* named_threads_thread${i}" "$tmpdir/script"; then
+		echo "Error: thread${i} missing" >&2
+		exit 1
+	fi
+done
+
+exit 0

-- 
2.43.0