| #!/bin/sh |
| # Check branch stack sampling |
| |
| # SPDX-License-Identifier: GPL-2.0 |
| # German Gomez <german.gomez@arm.com>, 2022 |
| |
| # 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 |
| |
| 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" |