linux-kernel - [PATCH v2 4/4] perf tests: Add a DRM PMU test

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Message-ID: <20250326035045.129440-5-irogers@google.com>
Date: Tue, 25 Mar 2025 20:50:45 -0700
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	Kan Liang <kan.liang@...ux.intel.com>, 
	"Masami Hiramatsu (Google)" <mhiramat@...nel.org>, James Clark <james.clark@...aro.org>, 
	Weilin Wang <weilin.wang@...el.com>, Dominique Martinet <asmadeus@...ewreck.org>, 
	Thomas Richter <tmricht@...ux.ibm.com>, Junhao He <hejunhao3@...wei.com>, 
	Jean-Philippe Romain <jean-philippe.romain@...s.st.com>, linux-kernel@...r.kernel.org, 
	linux-perf-users@...r.kernel.org
Cc: dri-devel@...ts.freedesktop.org
Subject: [PATCH v2 4/4] perf tests: Add a DRM PMU test

The test opens any DRM devices so that the shell has fdinfo files
containing the DRM data. The test then uses perf stat to make sure the
events can be read.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/tests/shell/drm_pmu.sh | 77 +++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100755 tools/perf/tests/shell/drm_pmu.sh

diff --git a/tools/perf/tests/shell/drm_pmu.sh b/tools/perf/tests/shell/drm_pmu.sh
new file mode 100755
index 000000000000..55477603a80f
--- /dev/null
+++ b/tools/perf/tests/shell/drm_pmu.sh
@@ -0,0 +1,77 @@
+#!/bin/bash
+# DRM PMU
+# SPDX-License-Identifier: GPL-2.0
+
+set -e
+
+output=$(mktemp /tmp/perf.drm_pmu.XXXXXX.txt)
+
+cleanup() {
+  rm -f "${output}"
+
+  trap - EXIT TERM INT
+}
+
+trap_cleanup() {
+  echo "Unexpected signal in ${FUNCNAME[1]}"
+  cleanup
+  exit 1
+}
+trap trap_cleanup EXIT TERM INT
+
+# Array to store file descriptors and device names
+declare -A device_fds
+
+# Open all devices and store file descriptors. Opening the device will create a
+# /proc/$$/fdinfo file containing the DRM statistics.
+fd_count=3 # Start with file descriptor 3
+for device in /dev/dri/*
+do
+  if [[ ! -c "$device" ]]
+  then
+    continue
+  fi
+  major=$(stat -c "%Hr" "$device")
+  if [[ "$major" != 226 ]]
+  then
+    continue
+  fi
+  echo "Opening $device"
+  eval "exec $fd_count<\"$device\""
+  echo "fdinfo for: $device (FD: $fd_count)"
+  cat "/proc/$$/fdinfo/$fd_count"
+  echo
+  device_fds["$device"]="$fd_count"
+  fd_count=$((fd_count + 1))
+done
+
+if [[ ${#device_fds[@]} -eq 0 ]]
+then
+  echo "No DRM devices found [Skip]"
+  exit 2
+fi
+
+# For each DRM event
+err=0
+for p in $(perf list --raw-dump drm-)
+do
+  echo -n "Testing perf stat of $p. "
+  perf stat -e "$p" --pid=$$ true > "$output" 2>&1
+  if ! grep -q "$p" "$output"
+  then
+    echo "Missing DRM event in: [Failed]"
+    cat "$output"
+    err=1
+  else
+    echo "[OK]"
+  fi
+done
+
+# Close all file descriptors
+for fd in "${device_fds[@]}"; do
+  eval "exec $fd<&-"
+done
+
+# Finished
+cleanup
+exit $err
-- 
2.49.0.395.g12beb8f557-goog