tools/testing/selftests/firmware/fw_filesystem.sh

   1 #!/bin/sh
   2 # This validates that the kernel will load firmware out of its list of
   3 # firmware locations on disk. Since the user helper does similar work,
   4 # we reset the custom load directory to a location the user helper doesn't
   5 # know so we can be sure we're not accidentally testing the user helper.
   6 set -e
   7
   8 DIR=/sys/devices/virtual/misc/test_firmware
   9 TEST_DIR=$(dirname $0)
  10
  11 test_modprobe()
  12 {
  13         if [ ! -d $DIR ]; then
  14                 echo "$0: $DIR not present"
  15                 echo "You must have the following enabled in your kernel:"
  16                 cat $TEST_DIR/config
  17                 exit 1
  18         fi
  19 }
  20
  21 trap "test_modprobe" EXIT
  22
  23 if [ ! -d $DIR ]; then
  24         modprobe test_firmware
  25 fi
  26
  27 # CONFIG_FW_LOADER_USER_HELPER has a sysfs class under /sys/class/firmware/
  28 # These days no one enables CONFIG_FW_LOADER_USER_HELPER so check for that
  29 # as an indicator for CONFIG_FW_LOADER_USER_HELPER.
  30 HAS_FW_LOADER_USER_HELPER=$(if [ -d /sys/class/firmware/ ]; then echo yes; else echo no; fi)
  31
  32 if [ "$HAS_FW_LOADER_USER_HELPER" = "yes" ]; then
  33         OLD_TIMEOUT=$(cat /sys/class/firmware/timeout)
  34 fi
  35
  36 OLD_FWPATH=$(cat /sys/module/firmware_class/parameters/path)
  37
  38 FWPATH=$(mktemp -d)
  39 FW="$FWPATH/test-firmware.bin"
  40
  41 test_finish()
  42 {
  43         if [ "$HAS_FW_LOADER_USER_HELPER" = "yes" ]; then
  44                 echo "$OLD_TIMEOUT" >/sys/class/firmware/timeout
  45         fi
  46         echo -n "$OLD_PATH" >/sys/module/firmware_class/parameters/path
  47         rm -f "$FW"
  48         rmdir "$FWPATH"
  49 }
  50
  51 trap "test_finish" EXIT
  52
  53 if [ "$HAS_FW_LOADER_USER_HELPER" = "yes" ]; then
  54         # Turn down the timeout so failures don't take so long.
  55         echo 1 >/sys/class/firmware/timeout
  56 fi
  57
  58 # Set the kernel search path.
  59 echo -n "$FWPATH" >/sys/module/firmware_class/parameters/path
  60
  61 # This is an unlikely real-world firmware content. :)
  62 echo "ABCD0123" >"$FW"
  63
  64 NAME=$(basename "$FW")
  65
  66 if printf '\000' >"$DIR"/trigger_request; then
  67         echo "$0: empty filename should not succeed" >&2
  68         exit 1
  69 fi
  70
  71 if printf '\000' >"$DIR"/trigger_async_request; then
  72         echo "$0: empty filename should not succeed (async)" >&2
  73         exit 1
  74 fi
  75
  76 # Request a firmware that doesn't exist, it should fail.
  77 if echo -n "nope-$NAME" >"$DIR"/trigger_request; then
  78         echo "$0: firmware shouldn't have loaded" >&2
  79         exit 1
  80 fi
  81 if diff -q "$FW" /dev/test_firmware >/dev/null ; then
  82         echo "$0: firmware was not expected to match" >&2
  83         exit 1
  84 else
  85         if [ "$HAS_FW_LOADER_USER_HELPER" = "yes" ]; then
  86                 echo "$0: timeout works"
  87         fi
  88 fi
  89
  90 # This should succeed via kernel load or will fail after 1 second after
  91 # being handed over to the user helper, which won't find the fw either.
  92 if ! echo -n "$NAME" >"$DIR"/trigger_request ; then
  93         echo "$0: could not trigger request" >&2
  94         exit 1
  95 fi
  96
  97 # Verify the contents are what we expect.
  98 if ! diff -q "$FW" /dev/test_firmware >/dev/null ; then
  99         echo "$0: firmware was not loaded" >&2
 100         exit 1
 101 else
 102         echo "$0: filesystem loading works"
 103 fi
 104
 105 # Try the asynchronous version too
 106 if ! echo -n "$NAME" >"$DIR"/trigger_async_request ; then
 107         echo "$0: could not trigger async request" >&2
 108         exit 1
 109 fi
 110
 111 # Verify the contents are what we expect.
 112 if ! diff -q "$FW" /dev/test_firmware >/dev/null ; then
 113         echo "$0: firmware was not loaded (async)" >&2
 114         exit 1
 115 else
 116         echo "$0: async filesystem loading works"
 117 fi
 118
 119 exit 0