100 lines
2.5 KiB
Bash
Executable File
100 lines
2.5 KiB
Bash
Executable File
#!/bin/sh
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# This validates that the kernel will fall back to using the user helper
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# to load firmware it can't find on disk itself. We must request a firmware
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# that the kernel won't find, and any installed helper (e.g. udev) also
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# won't find so that we can do the load ourself manually.
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set -e
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modprobe test_firmware
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DIR=/sys/devices/virtual/misc/test_firmware
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# CONFIG_FW_LOADER_USER_HELPER has a sysfs class under /sys/class/firmware/
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# These days no one enables CONFIG_FW_LOADER_USER_HELPER so check for that
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# as an indicator for CONFIG_FW_LOADER_USER_HELPER.
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HAS_FW_LOADER_USER_HELPER=$(if [ -d /sys/class/firmware/ ]; then echo yes; else echo no; fi)
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if [ "$HAS_FW_LOADER_USER_HELPER" = "yes" ]; then
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OLD_TIMEOUT=$(cat /sys/class/firmware/timeout)
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else
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echo "usermode helper disabled so ignoring test"
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exit 0
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fi
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FWPATH=$(mktemp -d)
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FW="$FWPATH/test-firmware.bin"
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test_finish()
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{
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echo "$OLD_TIMEOUT" >/sys/class/firmware/timeout
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rm -f "$FW"
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rmdir "$FWPATH"
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}
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load_fw()
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{
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local name="$1"
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local file="$2"
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# This will block until our load (below) has finished.
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echo -n "$name" >"$DIR"/trigger_request &
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# Give kernel a chance to react.
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local timeout=10
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while [ ! -e "$DIR"/"$name"/loading ]; do
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sleep 0.1
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timeout=$(( $timeout - 1 ))
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if [ "$timeout" -eq 0 ]; then
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echo "$0: firmware interface never appeared" >&2
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exit 1
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fi
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done
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echo 1 >"$DIR"/"$name"/loading
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cat "$file" >"$DIR"/"$name"/data
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echo 0 >"$DIR"/"$name"/loading
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# Wait for request to finish.
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wait
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}
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trap "test_finish" EXIT
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# This is an unlikely real-world firmware content. :)
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echo "ABCD0123" >"$FW"
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NAME=$(basename "$FW")
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# Test failure when doing nothing (timeout works).
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echo 1 >/sys/class/firmware/timeout
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echo -n "$NAME" >"$DIR"/trigger_request
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if diff -q "$FW" /dev/test_firmware >/dev/null ; then
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echo "$0: firmware was not expected to match" >&2
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exit 1
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else
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echo "$0: timeout works"
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fi
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# Put timeout high enough for us to do work but not so long that failures
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# slow down this test too much.
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echo 4 >/sys/class/firmware/timeout
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# Load this script instead of the desired firmware.
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load_fw "$NAME" "$0"
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if diff -q "$FW" /dev/test_firmware >/dev/null ; then
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echo "$0: firmware was not expected to match" >&2
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exit 1
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else
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echo "$0: firmware comparison works"
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fi
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# Do a proper load, which should work correctly.
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load_fw "$NAME" "$FW"
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if ! diff -q "$FW" /dev/test_firmware >/dev/null ; then
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echo "$0: firmware was not loaded" >&2
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exit 1
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else
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echo "$0: user helper firmware loading works"
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fi
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exit 0
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