kernel

linux-6.8.1/tools/perf/tests/shell/test_brstack.sh

@@ -0,0 +1,82 @@
+#!/bin/sh
+# Check branch stack sampling
+
+# SPDX-License-Identifier: GPL-2.0
+# German Gomez <german.gomez@arm.com>, 2022
+
+shelldir=$(dirname "$0")
+# shellcheck source=lib/perf_has_symbol.sh
+. "${shelldir}"/lib/perf_has_symbol.sh
+
+# skip the test if the hardware doesn't support branch stack sampling
+# and if the architecture doesn't support filter types: any,save_type,u
+if ! perf record -o- --no-buildid --branch-filter any,save_type,u -- true > /dev/null 2>&1 ; then
+	echo "skip: system doesn't support filter types: any,save_type,u"
+	exit 2
+fi
+
+skip_test_missing_symbol brstack_bench
+
+TMPDIR=$(mktemp -d /tmp/__perf_test.program.XXXXX)
+TESTPROG="perf test -w brstack"
+
+cleanup() {
+	rm -rf $TMPDIR
+}
+
+trap cleanup EXIT TERM INT
+
+test_user_branches() {
+	echo "Testing user branch stack sampling"
+
+	perf record -o $TMPDIR/perf.data --branch-filter any,save_type,u -- ${TESTPROG} > /dev/null 2>&1
+	perf script -i $TMPDIR/perf.data --fields brstacksym | xargs -n1 > $TMPDIR/perf.script
+
+	# example of branch entries:
+	# 	brstack_foo+0x14/brstack_bar+0x40/P/-/-/0/CALL
+
+	set -x
+	grep -E -m1 "^brstack_bench\+[^ ]*/brstack_foo\+[^ ]*/IND_CALL/.*$"	$TMPDIR/perf.script
+	grep -E -m1 "^brstack_foo\+[^ ]*/brstack_bar\+[^ ]*/CALL/.*$"	$TMPDIR/perf.script
+	grep -E -m1 "^brstack_bench\+[^ ]*/brstack_foo\+[^ ]*/CALL/.*$"	$TMPDIR/perf.script
+	grep -E -m1 "^brstack_bench\+[^ ]*/brstack_bar\+[^ ]*/CALL/.*$"	$TMPDIR/perf.script
+	grep -E -m1 "^brstack_bar\+[^ ]*/brstack_foo\+[^ ]*/RET/.*$"		$TMPDIR/perf.script
+	grep -E -m1 "^brstack_foo\+[^ ]*/brstack_bench\+[^ ]*/RET/.*$"	$TMPDIR/perf.script
+	grep -E -m1 "^brstack_bench\+[^ ]*/brstack_bench\+[^ ]*/COND/.*$"	$TMPDIR/perf.script
+	grep -E -m1 "^brstack\+[^ ]*/brstack\+[^ ]*/UNCOND/.*$"		$TMPDIR/perf.script
+	set +x
+
+	# some branch types are still not being tested:
+	# IND COND_CALL COND_RET SYSCALL SYSRET IRQ SERROR NO_TX
+}
+
+# first argument <arg0> is the argument passed to "--branch-stack <arg0>,save_type,u"
+# second argument are the expected branch types for the given filter
+test_filter() {
+	test_filter_filter=$1
+	test_filter_expect=$2
+
+	echo "Testing branch stack filtering permutation ($test_filter_filter,$test_filter_expect)"
+
+	perf record -o $TMPDIR/perf.data --branch-filter $test_filter_filter,save_type,u -- ${TESTPROG} > /dev/null 2>&1
+	perf script -i $TMPDIR/perf.data --fields brstack | xargs -n1 > $TMPDIR/perf.script
+
+	# fail if we find any branch type that doesn't match any of the expected ones
+	# also consider UNKNOWN branch types (-)
+	if grep -E -vm1 "^[^ ]*/($test_filter_expect|-|( *))/.*$" $TMPDIR/perf.script; then
+		return 1
+	fi
+}
+
+set -e
+
+test_user_branches
+
+test_filter "any_call"	"CALL|IND_CALL|COND_CALL|SYSCALL|IRQ"
+test_filter "call"	"CALL|SYSCALL"
+test_filter "cond"	"COND"
+test_filter "any_ret"	"RET|COND_RET|SYSRET|ERET"
+
+test_filter "call,cond"		"CALL|SYSCALL|COND"
+test_filter "any_call,cond"		"CALL|IND_CALL|COND_CALL|IRQ|SYSCALL|COND"
+test_filter "cond,any_call,any_ret"	"COND|CALL|IND_CALL|COND_CALL|SYSCALL|IRQ|RET|COND_RET|SYSRET|ERET"