perf tests: Add a DRM PMU test

#!/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]"

  cleanup

  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