tools/perf/tests/shell/test_arm_spe.sh

   1 #!/bin/sh
   2 # Check Arm SPE trace data recording and synthesized samples
   3
   4 # Uses the 'perf record' to record trace data of Arm SPE events;
   5 # then verify if any SPE event samples are generated by SPE with
   6 # 'perf script' and 'perf report' commands.
   7
   8 # SPDX-License-Identifier: GPL-2.0
   9 # German Gomez <german.gomez@arm.com>, 2021
  10
  11 skip_if_no_arm_spe_event() {
  12         perf list | egrep -q 'arm_spe_[0-9]+//' && return 0
  13
  14         # arm_spe event doesn't exist
  15         return 2
  16 }
  17
  18 skip_if_no_arm_spe_event || exit 2
  19
  20 perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
  21 glb_err=0
  22
  23 cleanup_files()
  24 {
  25         rm -f ${perfdata}
  26         exit $glb_err
  27 }
  28
  29 trap cleanup_files exit term int
  30
  31 arm_spe_report() {
  32         if [ $2 != 0 ]; then
  33                 echo "$1: FAIL"
  34                 glb_err=$2
  35         else
  36                 echo "$1: PASS"
  37         fi
  38 }
  39
  40 perf_script_samples() {
  41         echo "Looking at perf.data file for dumping samples:"
  42
  43         # from arm-spe.c/arm_spe_synth_events()
  44         events="(ld1-miss|ld1-access|llc-miss|lld-access|tlb-miss|tlb-access|branch-miss|remote-access|memory)"
  45
  46         # Below is an example of the samples dumping:
  47         #       dd  3048 [002]          1    l1d-access:      ffffaa64999c __GI___libc_write+0x3c (/lib/aarch64-linux-gnu/libc-2.27.so)
  48         #       dd  3048 [002]          1    tlb-access:      ffffaa64999c __GI___libc_write+0x3c (/lib/aarch64-linux-gnu/libc-2.27.so)
  49         #       dd  3048 [002]          1        memory:      ffffaa64999c __GI___libc_write+0x3c (/lib/aarch64-linux-gnu/libc-2.27.so)
  50         perf script -F,-time -i ${perfdata} 2>&1 | \
  51                 egrep " +$1 +[0-9]+ .* +${events}:(.*:)? +" > /dev/null 2>&1
  52 }
  53
  54 perf_report_samples() {
  55         echo "Looking at perf.data file for reporting samples:"
  56
  57         # Below is an example of the samples reporting:
  58         #   73.04%    73.04%  dd    libc-2.27.so      [.] _dl_addr
  59         #    7.71%     7.71%  dd    libc-2.27.so      [.] getenv
  60         #    2.59%     2.59%  dd    ld-2.27.so        [.] strcmp
  61         perf report --stdio -i ${perfdata} 2>&1 | \
  62                 egrep " +[0-9]+\.[0-9]+% +[0-9]+\.[0-9]+% +$1 " > /dev/null 2>&1
  63 }
  64
  65 arm_spe_snapshot_test() {
  66         echo "Recording trace with snapshot mode $perfdata"
  67         perf record -o ${perfdata} -e arm_spe// -S \
  68                 -- dd if=/dev/zero of=/dev/null > /dev/null 2>&1 &
  69         PERFPID=$!
  70
  71         # Wait for perf program
  72         sleep 1
  73
  74         # Send signal to snapshot trace data
  75         kill -USR2 $PERFPID
  76
  77         # Stop perf program
  78         kill $PERFPID
  79         wait $PERFPID
  80
  81         perf_script_samples dd &&
  82         perf_report_samples dd
  83
  84         err=$?
  85         arm_spe_report "SPE snapshot testing" $err
  86 }
  87
  88 arm_spe_snapshot_test
  89 exit $glb_err