perf arm-spe: Snapshot mode test

Shell script test_arm_spe.sh has been added to test the recording of SPE
tracing events in snapshot mode.

Reviewed-by: Leo Yan <leo.yan@linaro.org>
Signed-off-by: German Gomez <german.gomez@arm.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: John Garry <john.garry@huawei.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/20211109163009.92072-4-german.gomez@arm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/tests/shell/test_arm_spe.sh b/tools/perf/tests/shell/test_arm_spe.sh
new file mode 100755 (executable)
index 0000000..e59044e
--- /dev/null
+++ b/tools/perf/tests/shell/test_arm_spe.sh
@@ -0,0 +1,89 @@
+#!/bin/sh
+# Check Arm SPE trace data recording and synthesized samples
+
+# Uses the 'perf record' to record trace data of Arm SPE events;
+# then verify if any SPE event samples are generated by SPE with
+# 'perf script' and 'perf report' commands.
+
+# SPDX-License-Identifier: GPL-2.0
+# German Gomez <german.gomez@arm.com>, 2021
+
+skip_if_no_arm_spe_event() {
+       perf list | egrep -q 'arm_spe_[0-9]+//' && return 0
+
+       # arm_spe event doesn't exist
+       return 2
+}
+
+skip_if_no_arm_spe_event || exit 2
+
+perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
+glb_err=0
+
+cleanup_files()
+{
+       rm -f ${perfdata}
+       exit $glb_err
+}
+
+trap cleanup_files exit term int
+
+arm_spe_report() {
+       if [ $2 != 0 ]; then
+               echo "$1: FAIL"
+               glb_err=$2
+       else
+               echo "$1: PASS"
+       fi
+}
+
+perf_script_samples() {
+       echo "Looking at perf.data file for dumping samples:"
+
+       # from arm-spe.c/arm_spe_synth_events()
+       events="(ld1-miss|ld1-access|llc-miss|lld-access|tlb-miss|tlb-access|branch-miss|remote-access|memory)"
+
+       # Below is an example of the samples dumping:
+       #       dd  3048 [002]          1    l1d-access:      ffffaa64999c __GI___libc_write+0x3c (/lib/aarch64-linux-gnu/libc-2.27.so)
+       #       dd  3048 [002]          1    tlb-access:      ffffaa64999c __GI___libc_write+0x3c (/lib/aarch64-linux-gnu/libc-2.27.so)
+       #       dd  3048 [002]          1        memory:      ffffaa64999c __GI___libc_write+0x3c (/lib/aarch64-linux-gnu/libc-2.27.so)
+       perf script -F,-time -i ${perfdata} 2>&1 | \
+               egrep " +$1 +[0-9]+ .* +${events}:(.*:)? +" > /dev/null 2>&1
+}
+
+perf_report_samples() {
+       echo "Looking at perf.data file for reporting samples:"
+
+       # Below is an example of the samples reporting:
+       #   73.04%    73.04%  dd    libc-2.27.so      [.] _dl_addr
+       #    7.71%     7.71%  dd    libc-2.27.so      [.] getenv
+       #    2.59%     2.59%  dd    ld-2.27.so        [.] strcmp
+       perf report --stdio -i ${perfdata} 2>&1 | \
+               egrep " +[0-9]+\.[0-9]+% +[0-9]+\.[0-9]+% +$1 " > /dev/null 2>&1
+}
+
+arm_spe_snapshot_test() {
+       echo "Recording trace with snapshot mode $perfdata"
+       perf record -o ${perfdata} -e arm_spe// -S \
+               -- dd if=/dev/zero of=/dev/null > /dev/null 2>&1 &
+       PERFPID=$!
+
+       # Wait for perf program
+       sleep 1
+
+       # Send signal to snapshot trace data
+       kill -USR2 $PERFPID
+
+       # Stop perf program
+       kill $PERFPID
+       wait $PERFPID
+
+       perf_script_samples dd &&
+       perf_report_samples dd
+
+       err=$?
+       arm_spe_report "SPE snapshot testing" $err
+}
+
+arm_spe_snapshot_test
+exit $glb_err