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