124 lines
3.3 KiB
Bash
124 lines
3.3 KiB
Bash
|
#!/bin/sh
|
||
|
|
# This validates that the kernel will fall back to using the user helper
|
||
|
|
# to load firmware it can't find on disk itself. We must request a firmware
|
||
|
|
# that the kernel won't find, and any installed helper (e.g. udev) also
|
||
|
|
# won't find so that we can do the load ourself manually.
|
||
|
|
set -e
|
||
|
|
|
||
|
|
modprobe test_firmware
|
||
|
|
|
||
|
|
DIR=/sys/devices/virtual/misc/test_firmware
|
||
|
|
|
||
|
|
# CONFIG_FW_LOADER_USER_HELPER has a sysfs class under /sys/class/firmware/
|
||
|
|
# These days no one enables CONFIG_FW_LOADER_USER_HELPER so check for that
|
||
|
|
# as an indicator for CONFIG_FW_LOADER_USER_HELPER.
|
||
|
|
HAS_FW_LOADER_USER_HELPER=$(if [ -d /sys/class/firmware/ ]; then echo yes; else echo no; fi)
|
||
|
|
|
||
|
|
if [ "$HAS_FW_LOADER_USER_HELPER" = "yes" ]; then
|
||
|
|
OLD_TIMEOUT=$(cat /sys/class/firmware/timeout)
|
||
|
|
else
|
||
|
|
echo "usermode helper disabled so ignoring test"
|
||
|
|
exit 0
|
||
|
|
fi
|
||
|
|
|
||
|
|
FWPATH=$(mktemp -d)
|
||
|
|
FW="$FWPATH/test-firmware.bin"
|
||
|
|
|
||
|
|
test_finish()
|
||
|
|
{
|
||
|
|
echo "$OLD_TIMEOUT" >/sys/class/firmware/timeout
|
||
|
|
rm -f "$FW"
|
||
|
|
rmdir "$FWPATH"
|
||
|
|
}
|
||
|
|
|
||
|
|
load_fw()
|
||
|
|
{
|
||
|
|
local name="$1"
|
||
|
|
local file="$2"
|
||
|
|
|
||
|
|
# This will block until our load (below) has finished.
|
||
|
|
echo -n "$name" >"$DIR"/trigger_request &
|
||
|
|
|
||
|
|
# Give kernel a chance to react.
|
||
|
|
local timeout=10
|
||
|
|
while [ ! -e "$DIR"/"$name"/loading ]; do
|
||
|
|
sleep 0.1
|
||
|
|
timeout=$(( $timeout - 1 ))
|
||
|
|
if [ "$timeout" -eq 0 ]; then
|
||
|
|
echo "$0: firmware interface never appeared" >&2
|
||
|
|
exit 1
|
||
|
|
fi
|
||
|
|
done
|
||
|
|
|
||
|
|
echo 1 >"$DIR"/"$name"/loading
|
||
|
|
cat "$file" >"$DIR"/"$name"/data
|
||
|
|
echo 0 >"$DIR"/"$name"/loading
|
||
|
|
|
||
|
|
# Wait for request to finish.
|
||
|
|
wait
|
||
|
|
}
|
||
|
|
|
||
|
|
trap "test_finish" EXIT
|
||
|
|
|
||
|
|
# This is an unlikely real-world firmware content. :)
|
||
|
|
echo "ABCD0123" >"$FW"
|
||
|
|
NAME=$(basename "$FW")
|
||
|
|
|
||
|
|
DEVPATH="$DIR"/"nope-$NAME"/loading
|
||
|
|
|
||
|
|
# Test failure when doing nothing (timeout works).
|
||
|
|
echo -n 2 >/sys/class/firmware/timeout
|
||
|
|
echo -n "nope-$NAME" >"$DIR"/trigger_request 2>/dev/null &
|
||
|
|
|
||
|
|
# Give the kernel some time to load the loading file, must be less
|
||
|
|
# than the timeout above.
|
||
|
|
sleep 1
|
||
|
|
if [ ! -f $DEVPATH ]; then
|
||
|
|
echo "$0: fallback mechanism immediately cancelled"
|
||
|
|
echo ""
|
||
|
|
echo "The file never appeared: $DEVPATH"
|
||
|
|
echo ""
|
||
|
|
echo "This might be a distribution udev rule setup by your distribution"
|
||
|
|
echo "to immediately cancel all fallback requests, this must be"
|
||
|
|
echo "removed before running these tests. To confirm look for"
|
||
|
|
echo "a firmware rule like /lib/udev/rules.d/50-firmware.rules"
|
||
|
|
echo "and see if you have something like this:"
|
||
|
|
echo ""
|
||
|
|
echo "SUBSYSTEM==\"firmware\", ACTION==\"add\", ATTR{loading}=\"-1\""
|
||
|
|
echo ""
|
||
|
|
echo "If you do remove this file or comment out this line before"
|
||
|
|
echo "proceeding with these tests."
|
||
|
|
exit 1
|
||
|
|
fi
|
||
|
|
|
||
|
|
if diff -q "$FW" /dev/test_firmware >/dev/null ; then
|
||
|
|
echo "$0: firmware was not expected to match" >&2
|
||
|
|
exit 1
|
||
|
|
else
|
||
|
|
echo "$0: timeout works"
|
||
|
|
fi
|
||
|
|
|
||
|
|
# Put timeout high enough for us to do work but not so long that failures
|
||
|
|
# slow down this test too much.
|
||
|
|
echo 4 >/sys/class/firmware/timeout
|
||
|
|
|
||
|
|
# Load this script instead of the desired firmware.
|
||
|
|
load_fw "$NAME" "$0"
|
||
|
|
if diff -q "$FW" /dev/test_firmware >/dev/null ; then
|
||
|
|
echo "$0: firmware was not expected to match" >&2
|
||
|
|
exit 1
|
||
|
|
else
|
||
|
|
echo "$0: firmware comparison works"
|
||
|
|
fi
|
||
|
|
|
||
|
|
# Do a proper load, which should work correctly.
|
||
|
|
load_fw "$NAME" "$FW"
|
||
|
|
if ! diff -q "$FW" /dev/test_firmware >/dev/null ; then
|
||
|
|
echo "$0: firmware was not loaded" >&2
|
||
|
|
exit 1
|
||
|
|
else
|
||
|
|
echo "$0: user helper firmware loading works"
|
||
|
|
fi
|
||
|
|
|
||
|
|
exit 0
|