#!/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,uif ! 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 2fi 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 | tr -s ' ' '\n' > $TMPDIR/perf.script 	# example of branch entries:	# 	brstack_foo+0x14/brstack_bar+0x40/P/-/-/0/CALL 	set -x	grep -E -m1 "^brstack_bench\+[^ ]*/brstack_foo\+[^ ]*/IND_CALL/.*$"	$TMPDIR/perf.script	grep -E -m1 "^brstack_foo\+[^ ]*/brstack_bar\+[^ ]*/CALL/.*$"	$TMPDIR/perf.script	grep -E -m1 "^brstack_bench\+[^ ]*/brstack_foo\+[^ ]*/CALL/.*$"	$TMPDIR/perf.script	grep -E -m1 "^brstack_bench\+[^ ]*/brstack_bar\+[^ ]*/CALL/.*$"	$TMPDIR/perf.script	grep -E -m1 "^brstack_bar\+[^ ]*/brstack_foo\+[^ ]*/RET/.*$"		$TMPDIR/perf.script	grep -E -m1 "^brstack_foo\+[^ ]*/brstack_bench\+[^ ]*/RET/.*$"	$TMPDIR/perf.script	grep -E -m1 "^brstack_bench\+[^ ]*/brstack_bench\+[^ ]*/COND/.*$"	$TMPDIR/perf.script	grep -E -m1 "^brstack\+[^ ]*/brstack\+[^ ]*/UNCOND/.*$"		$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 filtertest_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 | tr -s ' ' '\n' | grep '.' > $TMPDIR/perf.script 	# fail if we find any branch type that doesn't match any of the expected ones	# also consider UNKNOWN branch types (-)	if grep -E -vm1 "^[^ ]*/($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"