diff options
Diffstat (limited to 'tools/perf/tests/shell/test_brstack.sh')
| -rwxr-xr-x | tools/perf/tests/shell/test_brstack.sh | 131 |
1 files changed, 101 insertions, 30 deletions
diff --git a/tools/perf/tests/shell/test_brstack.sh b/tools/perf/tests/shell/test_brstack.sh index 85233d435be6..71550e0b37ba 100755 --- a/tools/perf/tests/shell/test_brstack.sh +++ b/tools/perf/tests/shell/test_brstack.sh @@ -38,9 +38,13 @@ is_arm64() { [ "$(uname -m)" = "aarch64" ]; } +has_kaslr_bug() { + [ "$(uname -m)" != "aarch64" ]; +} + check_branches() { if ! tr -s ' ' '\n' < "$TMPDIR/perf.script" | grep -E -m1 -q "$1"; then - echo "Branches missing $1" + echo "ERROR: Branches missing $1" err=1 fi } @@ -48,6 +52,8 @@ check_branches() { test_user_branches() { echo "Testing user branch stack sampling" + start_err=$err + err=0 perf record -o "$TMPDIR/perf.data" --branch-filter any,save_type,u -- ${TESTPROG} > "$TMPDIR/record.txt" 2>&1 perf script -i "$TMPDIR/perf.data" --fields brstacksym > "$TMPDIR/perf.script" @@ -73,59 +79,105 @@ test_user_branches() { perf script -i "$TMPDIR/perf.data" --fields brstack | \ tr ' ' '\n' > "$TMPDIR/perf.script" - # There should be no kernel addresses with the u option, in either - # source or target addresses. - if grep -E -m1 "0x[89a-f][0-9a-f]{15}" $TMPDIR/perf.script; then - echo "ERROR: Kernel address found in user mode" + # There should be no kernel addresses in the target with the u option. + local regex="0x[89a-f][0-9a-f]{15}" + if has_kaslr_bug; then + # If the system has a kaslr bug that may leak kernel addresses + # in the source of something like an ERET/SYSRET. Make the regex + # more specific and just check the target address is in user + # code. + regex="^0x[0-9a-f]{0,16}/0x[89a-f][0-9a-f]{15}/" + fi + if grep -q -E -m1 "$regex" $TMPDIR/perf.script; then + echo "Testing user branch stack sampling [Failed kernel address found in user mode]" err=1 fi # some branch types are still not being tested: # IND COND_CALL COND_RET SYSRET SERROR NO_TX + if [ $err -eq 0 ]; then + echo "Testing user branch stack sampling [Passed]" + err=$start_err + else + echo "Testing user branch stack sampling [Failed]" + fi } test_trap_eret_branches() { echo "Testing trap & eret branches" + if ! is_arm64; then - echo "skip: not arm64" - else + echo "Testing trap & eret branches [Skipped not arm64]" + return + fi + start_err=$err + local ret=1 + for loops in 1000 10000 100000; do + err=0 perf record -o $TMPDIR/perf.data --branch-filter any,save_type,u,k -- \ - perf test -w traploop 1000 + perf test -w traploop $loops > "$TMPDIR/record.txt" 2>&1 perf script -i $TMPDIR/perf.data --fields brstacksym | \ tr ' ' '\n' > $TMPDIR/perf.script # BRBINF<n>.TYPE == TRAP are mapped to PERF_BR_IRQ by the BRBE driver check_branches "^trap_bench\+[^ ]+/[^ ]/IRQ/" check_branches "^[^ ]+/trap_bench\+[^ ]+/ERET/" + if [ $err -eq 0 ]; then + ret=0 + break + fi + done + + if [ $ret -eq 0 ]; then + echo "Testing trap & eret branches [Passed]" + err=$start_err + else + echo "Testing trap & eret branches [Failed]" + err=1 fi } test_kernel_branches() { - echo "Testing that k option only includes kernel source addresses" + echo "Testing kernel branch sampling" - if ! perf record --branch-filter any,k -o- -- true > /dev/null; then - echo "skip: not enough privileges" - else + if ! perf record --branch-filter any,k -o- -- true > "$TMPDIR/record.txt" 2>&1; then + echo "Testing that k option [Skipped not enough privileges]" + return + fi + start_err=$err + local ret=1 + for loops in 1000 10000 100000; do + err=0 perf record -o $TMPDIR/perf.data --branch-filter any,k -- \ - perf bench syscall basic --loop 1000 + perf bench syscall basic --loop $loops > "$TMPDIR/record.txt" 2>&1 perf script -i $TMPDIR/perf.data --fields brstack | \ tr ' ' '\n' > $TMPDIR/perf.script # Example of branch entries: # "0xffffffff93bda241/0xffffffff93bda20f/M/-/-/..." - # Source addresses come first and target address can be either - # userspace or kernel even with k option, as long as the source - # is in kernel. + # Source addresses come first in user or kernel code. Next is the target + # address that must be in the kernel. - #Look for source addresses with top bit set - if ! grep -E -m1 "^0x[89a-f][0-9a-f]{15}" $TMPDIR/perf.script; then - echo "ERROR: Kernel branches missing" + # Look for source addresses with top bit set + if ! grep -q -E -m1 "^0x[89a-f][0-9a-f]{15}" $TMPDIR/perf.script; then err=1 fi - # Look for no source addresses without top bit set - if grep -E -m1 "^0x[0-7][0-9a-f]{0,15}" $TMPDIR/perf.script; then - echo "ERROR: User branches found with kernel filter" + # Look for no target addresses without top bit set + if grep -q -E -m1 "^0x[0-9a-f]{0,16}/0x[0-7][0-9a-f]{1,15}/" \ + $TMPDIR/perf.script; then err=1 fi + if [ $err -eq 0 ]; then + ret=0 + break + fi + done + + if [ $ret -eq 0 ]; then + echo "Testing kernel branch sampling [Passed]" + err=$start_err + else + echo "Testing kernel branch sampling [Failed]" + err=1 fi } @@ -136,14 +188,15 @@ test_filter() { 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" -- ${TESTPROG} > "$TMPDIR/record.txt" 2>&1 + perf record -o "$TMPDIR/perf.data" --branch-filter "$test_filter_filter,save_type,u" -- \ + ${TESTPROG} > "$TMPDIR/record.txt" 2>&1 perf script -i "$TMPDIR/perf.data" --fields brstack > "$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 [ ! -s "$TMPDIR/perf.script" ] then - echo "Empty script output" + echo "Testing branch stack filtering [Failed empty script output]" err=1 return fi @@ -154,26 +207,44 @@ test_filter() { > "$TMPDIR/perf.script-filtered" || true if [ -s "$TMPDIR/perf.script-filtered" ] then - echo "Unexpected branch filter in script output" + echo "Testing branch stack filtering [Failed unexpected branch filter]" cat "$TMPDIR/perf.script" err=1 return fi + echo "Testing branch stack filtering [Passed]" } test_syscall() { echo "Testing syscalls" # skip if perf doesn't have enough privileges - if ! perf record --branch-filter any,k -o- -- true > /dev/null; then - echo "skip: not enough privileges" - else + if ! perf record --branch-filter any,k -o- -- true > "$TMPDIR/record.txt" 2>&1; then + echo "Testing syscalls [Skipped: not enough privileges]" + return + fi + start_err=$err + local ret=1 + for loops in 8000 30000 100000; do + err=0 perf record -o $TMPDIR/perf.data --branch-filter \ - any_call,save_type,u,k -c 10000 -- \ - perf bench syscall basic --loop 1000 + any_call,save_type,u,k -c 10007 -- \ + perf bench syscall basic --loop $loops > "$TMPDIR/record.txt" 2>&1 perf script -i $TMPDIR/perf.data --fields brstacksym | \ tr ' ' '\n' > $TMPDIR/perf.script check_branches "getppid[^ ]*/SYSCALL/" + if [ $err -eq 0 ]; then + ret=0 + break + fi + done + + if [ $ret -eq 0 ]; then + echo "Testing syscalls [Passed]" + err=$start_err + else + echo "Testing syscalls [Failed]" + err=1 fi } set -e |