tools/testing/selftests/firmware/fw_lib.sh

   1 #!/bin/bash
   2 # SPDX-License-Identifier: GPL-2.0
   3
   4 # Library of helpers for test scripts.
   5 set -e
   6
   7 DIR=/sys/devices/virtual/misc/test_firmware
   8
   9 PROC_CONFIG="/proc/config.gz"
  10 TEST_DIR=$(dirname $0)
  11
  12 # We need to load a different file to test request_firmware_into_buf
  13 # I believe the issue is firmware loaded cached vs. non-cached
  14 # with same filename is bungled.
  15 # To reproduce rename this to test-firmware.bin
  16 TEST_FIRMWARE_INTO_BUF_FILENAME=test-firmware-into-buf.bin
  17
  18 # Kselftest framework requirement - SKIP code is 4.
  19 ksft_skip=4
  20
  21 print_reqs_exit()
  22 {
  23         echo "You must have the following enabled in your kernel:" >&2
  24         cat $TEST_DIR/config >&2
  25         exit $ksft_skip
  26 }
  27
  28 test_modprobe()
  29 {
  30         if [ ! -d $DIR ]; then
  31                 print_reqs_exit
  32         fi
  33 }
  34
  35 check_mods()
  36 {
  37         local uid=$(id -u)
  38         if [ $uid -ne 0 ]; then
  39                 echo "skip all tests: must be run as root" >&2
  40                 exit $ksft_skip
  41         fi
  42
  43         trap "test_modprobe" EXIT
  44         if [ ! -d $DIR ]; then
  45                 modprobe test_firmware
  46         fi
  47         if [ ! -f $PROC_CONFIG ]; then
  48                 if modprobe configs 2>/dev/null; then
  49                         echo "Loaded configs module"
  50                         if [ ! -f $PROC_CONFIG ]; then
  51                                 echo "You must have the following enabled in your kernel:" >&2
  52                                 cat $TEST_DIR/config >&2
  53                                 echo "Resorting to old heuristics" >&2
  54                         fi
  55                 else
  56                         echo "Failed to load configs module, using old heuristics" >&2
  57                 fi
  58         fi
  59 }
  60
  61 check_setup()
  62 {
  63         HAS_FW_LOADER_USER_HELPER="$(kconfig_has CONFIG_FW_LOADER_USER_HELPER=y)"
  64         HAS_FW_LOADER_USER_HELPER_FALLBACK="$(kconfig_has CONFIG_FW_LOADER_USER_HELPER_FALLBACK=y)"
  65         HAS_FW_LOADER_COMPRESS="$(kconfig_has CONFIG_FW_LOADER_COMPRESS=y)"
  66         PROC_FW_IGNORE_SYSFS_FALLBACK="0"
  67         PROC_FW_FORCE_SYSFS_FALLBACK="0"
  68
  69         if [ -z $PROC_SYS_DIR ]; then
  70                 PROC_SYS_DIR="/proc/sys/kernel"
  71         fi
  72
  73         FW_PROC="${PROC_SYS_DIR}/firmware_config"
  74         FW_FORCE_SYSFS_FALLBACK="$FW_PROC/force_sysfs_fallback"
  75         FW_IGNORE_SYSFS_FALLBACK="$FW_PROC/ignore_sysfs_fallback"
  76
  77         if [ -f $FW_FORCE_SYSFS_FALLBACK ]; then
  78                 PROC_FW_FORCE_SYSFS_FALLBACK="$(cat $FW_FORCE_SYSFS_FALLBACK)"
  79         fi
  80
  81         if [ -f $FW_IGNORE_SYSFS_FALLBACK ]; then
  82                 PROC_FW_IGNORE_SYSFS_FALLBACK="$(cat $FW_IGNORE_SYSFS_FALLBACK)"
  83         fi
  84
  85         if [ "$PROC_FW_FORCE_SYSFS_FALLBACK" = "1" ]; then
  86                 HAS_FW_LOADER_USER_HELPER="yes"
  87                 HAS_FW_LOADER_USER_HELPER_FALLBACK="yes"
  88         fi
  89
  90         if [ "$PROC_FW_IGNORE_SYSFS_FALLBACK" = "1" ]; then
  91                 HAS_FW_LOADER_USER_HELPER_FALLBACK="no"
  92                 HAS_FW_LOADER_USER_HELPER="no"
  93         fi
  94
  95         if [ "$HAS_FW_LOADER_USER_HELPER" = "yes" ]; then
  96                OLD_TIMEOUT="$(cat /sys/class/firmware/timeout)"
  97         fi
  98
  99         OLD_FWPATH="$(cat /sys/module/firmware_class/parameters/path)"
 100
 101         if [ "$HAS_FW_LOADER_COMPRESS" = "yes" ]; then
 102                 if ! which xz 2> /dev/null > /dev/null; then
 103                         HAS_FW_LOADER_COMPRESS=""
 104                 fi
 105         fi
 106 }
 107
 108 verify_reqs()
 109 {
 110         if [ "$TEST_REQS_FW_SYSFS_FALLBACK" = "yes" ]; then
 111                 if [ ! "$HAS_FW_LOADER_USER_HELPER" = "yes" ]; then
 112                         echo "usermode helper disabled so ignoring test"
 113                         exit 0
 114                 fi
 115         fi
 116 }
 117
 118 setup_tmp_file()
 119 {
 120         FWPATH=$(mktemp -d)
 121         FW="$FWPATH/test-firmware.bin"
 122         echo "ABCD0123" >"$FW"
 123         FW_INTO_BUF="$FWPATH/$TEST_FIRMWARE_INTO_BUF_FILENAME"
 124         echo "EFGH4567" >"$FW_INTO_BUF"
 125         NAME=$(basename "$FW")
 126         if [ "$TEST_REQS_FW_SET_CUSTOM_PATH" = "yes" ]; then
 127                 echo -n "$FWPATH" >/sys/module/firmware_class/parameters/path
 128         fi
 129 }
 130
 131 __setup_random_file()
 132 {
 133         RANDOM_FILE_PATH="$(mktemp -p $FWPATH)"
 134         # mktemp says dry-run -n is unsafe, so...
 135         if [[ "$1" = "fake" ]]; then
 136                 rm -rf $RANDOM_FILE_PATH
 137                 sync
 138         else
 139                 echo "ABCD0123" >"$RANDOM_FILE_PATH"
 140         fi
 141         echo $RANDOM_FILE_PATH
 142 }
 143
 144 setup_random_file()
 145 {
 146         echo $(__setup_random_file)
 147 }
 148
 149 setup_random_file_fake()
 150 {
 151         echo $(__setup_random_file fake)
 152 }
 153
 154 proc_set_force_sysfs_fallback()
 155 {
 156         if [ -f $FW_FORCE_SYSFS_FALLBACK ]; then
 157                 echo -n $1 > $FW_FORCE_SYSFS_FALLBACK
 158                 check_setup
 159         fi
 160 }
 161
 162 proc_set_ignore_sysfs_fallback()
 163 {
 164         if [ -f $FW_IGNORE_SYSFS_FALLBACK ]; then
 165                 echo -n $1 > $FW_IGNORE_SYSFS_FALLBACK
 166                 check_setup
 167         fi
 168 }
 169
 170 proc_restore_defaults()
 171 {
 172         proc_set_force_sysfs_fallback 0
 173         proc_set_ignore_sysfs_fallback 0
 174 }
 175
 176 test_finish()
 177 {
 178         if [ "$HAS_FW_LOADER_USER_HELPER" = "yes" ]; then
 179                 echo "$OLD_TIMEOUT" >/sys/class/firmware/timeout
 180         fi
 181         if [ "$TEST_REQS_FW_SET_CUSTOM_PATH" = "yes" ]; then
 182                 if [ "$OLD_FWPATH" = "" ]; then
 183                         # A zero-length write won't work; write a null byte
 184                         printf '\000' >/sys/module/firmware_class/parameters/path
 185                 else
 186                         echo -n "$OLD_FWPATH" >/sys/module/firmware_class/parameters/path
 187                 fi
 188         fi
 189         if [ -f $FW ]; then
 190                 rm -f "$FW"
 191         fi
 192         if [ -f $FW_INTO_BUF ]; then
 193                 rm -f "$FW_INTO_BUF"
 194         fi
 195         if [ -d $FWPATH ]; then
 196                 rm -rf "$FWPATH"
 197         fi
 198         proc_restore_defaults
 199 }
 200
 201 kconfig_has()
 202 {
 203         if [ -f $PROC_CONFIG ]; then
 204                 if zgrep -q $1 $PROC_CONFIG 2>/dev/null; then
 205                         echo "yes"
 206                 else
 207                         echo "no"
 208                 fi
 209         else
 210                 # We currently don't have easy heuristics to infer this
 211                 # so best we can do is just try to use the kernel assuming
 212                 # you had enabled it. This matches the old behaviour.
 213                 if [ "$1" = "CONFIG_FW_LOADER_USER_HELPER_FALLBACK=y" ]; then
 214                         echo "yes"
 215                 elif [ "$1" = "CONFIG_FW_LOADER_USER_HELPER=y" ]; then
 216                         if [ -d /sys/class/firmware/ ]; then
 217                                 echo yes
 218                         else
 219                                 echo no
 220                         fi
 221                 fi
 222         fi
 223 }