1#!/bin/sh 2# Check branch stack sampling 3 4# SPDX-License-Identifier: GPL-2.0 5# German Gomez <german.gomez@arm.com>, 2022 6 7shelldir=$(dirname "$0") 8# shellcheck source=lib/perf_has_symbol.sh 9. "${shelldir}"/lib/perf_has_symbol.sh 10 11# skip the test if the hardware doesn't support branch stack sampling 12# and if the architecture doesn't support filter types: any,save_type,u 13if ! perf record -o- --no-buildid --branch-filter any,save_type,u -- true > /dev/null 2>&1 ; then 14 echo "skip: system doesn't support filter types: any,save_type,u" 15 exit 2 16fi 17 18skip_test_missing_symbol brstack_bench 19 20TMPDIR=$(mktemp -d /tmp/__perf_test.program.XXXXX) 21TESTPROG="perf test -w brstack" 22 23cleanup() { 24 rm -rf $TMPDIR 25} 26 27trap cleanup EXIT TERM INT 28 29test_user_branches() { 30 echo "Testing user branch stack sampling" 31 32 perf record -o $TMPDIR/perf.data --branch-filter any,save_type,u -- ${TESTPROG} > /dev/null 2>&1 33 perf script -i $TMPDIR/perf.data --fields brstacksym | xargs -n1 > $TMPDIR/perf.script 34 35 # example of branch entries: 36 # brstack_foo+0x14/brstack_bar+0x40/P/-/-/0/CALL 37 38 set -x 39 grep -E -m1 "^brstack_bench\+[^ ]*/brstack_foo\+[^ ]*/IND_CALL/.*$" $TMPDIR/perf.script 40 grep -E -m1 "^brstack_foo\+[^ ]*/brstack_bar\+[^ ]*/CALL/.*$" $TMPDIR/perf.script 41 grep -E -m1 "^brstack_bench\+[^ ]*/brstack_foo\+[^ ]*/CALL/.*$" $TMPDIR/perf.script 42 grep -E -m1 "^brstack_bench\+[^ ]*/brstack_bar\+[^ ]*/CALL/.*$" $TMPDIR/perf.script 43 grep -E -m1 "^brstack_bar\+[^ ]*/brstack_foo\+[^ ]*/RET/.*$" $TMPDIR/perf.script 44 grep -E -m1 "^brstack_foo\+[^ ]*/brstack_bench\+[^ ]*/RET/.*$" $TMPDIR/perf.script 45 grep -E -m1 "^brstack_bench\+[^ ]*/brstack_bench\+[^ ]*/COND/.*$" $TMPDIR/perf.script 46 grep -E -m1 "^brstack\+[^ ]*/brstack\+[^ ]*/UNCOND/.*$" $TMPDIR/perf.script 47 set +x 48 49 # some branch types are still not being tested: 50 # IND COND_CALL COND_RET SYSCALL SYSRET IRQ SERROR NO_TX 51} 52 53# first argument <arg0> is the argument passed to "--branch-stack <arg0>,save_type,u" 54# second argument are the expected branch types for the given filter 55test_filter() { 56 test_filter_filter=$1 57 test_filter_expect=$2 58 59 echo "Testing branch stack filtering permutation ($test_filter_filter,$test_filter_expect)" 60 61 perf record -o $TMPDIR/perf.data --branch-filter $test_filter_filter,save_type,u -- ${TESTPROG} > /dev/null 2>&1 62 perf script -i $TMPDIR/perf.data --fields brstack | xargs -n1 > $TMPDIR/perf.script 63 64 # fail if we find any branch type that doesn't match any of the expected ones 65 # also consider UNKNOWN branch types (-) 66 if grep -E -vm1 "^[^ ]*/($test_filter_expect|-|( *))/.*$" $TMPDIR/perf.script; then 67 return 1 68 fi 69} 70 71set -e 72 73test_user_branches 74 75test_filter "any_call" "CALL|IND_CALL|COND_CALL|SYSCALL|IRQ" 76test_filter "call" "CALL|SYSCALL" 77test_filter "cond" "COND" 78test_filter "any_ret" "RET|COND_RET|SYSRET|ERET" 79 80test_filter "call,cond" "CALL|SYSCALL|COND" 81test_filter "any_call,cond" "CALL|IND_CALL|COND_CALL|IRQ|SYSCALL|COND" 82test_filter "cond,any_call,any_ret" "COND|CALL|IND_CALL|COND_CALL|SYSCALL|IRQ|RET|COND_RET|SYSRET|ERET" 83