#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
# This validates that the kernel will fall back to using the fallback mechanism
# 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
TEST_REQS_FW_SYSFS_FALLBACK="yes"
TEST_REQS_FW_SET_CUSTOM_PATH="no"
TEST_DIR=$(dirname $0)
source $TEST_DIR/fw_lib.sh
check_mods
check_setup
verify_reqs
setup_tmp_file
trap "test_finish" EXIT
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
}
load_fw_cancel()
{
local name="$1"
local file="$2"
# This will block until our load (below) has finished.
echo -n "$name" >"$DIR"/trigger_request 2>/dev/null &
# Give kernel a chance to react.
local timeout=10
while [ ! -e "$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"/"$name"/loading
# Wait for request to finish.
wait
}
load_fw_custom()
{
if [ ! -e "$DIR"/trigger_custom_fallback ]; then
echo "$0: custom fallback trigger not present, ignoring test" >&2
exit $ksft_skip
fi
local name="$1"
local file="$2"
echo -n "$name" >"$DIR"/trigger_custom_fallback 2>/dev/null &
# Give kernel a chance to react.
local timeout=10
while [ ! -e "$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
return 0
}
load_fw_custom_cancel()
{
if [ ! -e "$DIR"/trigger_custom_fallback ]; then
echo "$0: canceling custom fallback trigger not present, ignoring test" >&2
exit $ksft_skip
fi
local name="$1"
local file="$2"
echo -n "$name" >"$DIR"/trigger_custom_fallback 2>/dev/null &
# Give kernel a chance to react.
local timeout=10
while [ ! -e "$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
# Wait for request to finish.
wait
return 0
}
load_fw_fallback_with_child()
{
local name="$1"
local file="$2"
# This is the value already set but we want to be explicit
echo 4 >/sys/class/firmware/timeout
sleep 1 &
SECONDS_BEFORE=$(date +%s)
echo -n "$name" >"$DIR"/trigger_request 2>/dev/null
SECONDS_AFTER=$(date +%s)
SECONDS_DELTA=$(($SECONDS_AFTER - $SECONDS_BEFORE))
if [ "$SECONDS_DELTA" -lt 4 ]; then
RET=1
else
RET=0
fi
wait
return $RET
}
test_syfs_timeout()
{
DEVPATH="$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 "$0: timeout works"
fi
}
run_sysfs_main_tests()
{
test_syfs_timeout
# Put timeout high enough for us to do work but not so long that failures
# slow down this test too much.
echo 4 >/sys/class/firmware/timeout
# Load this script instead of the desired firmware.
load_fw "$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 "$0: fallback mechanism works"
fi
load_fw_cancel "nope-$NAME" "$FW"
if diff -q "$FW" /dev/test_firmware >/dev/null ; then
echo "$0: firmware was expected to be cancelled" >&2
exit 1
else
echo "$0: cancelling fallback mechanism works"
fi
set +e
load_fw_fallback_with_child "nope-signal-$NAME" "$FW"
if [ "$?" -eq 0 ]; then
echo "$0: SIGCHLD on sync ignored as expected" >&2
else
echo "$0: error - sync firmware request cancelled due to SIGCHLD" >&2
exit 1
fi
set -e
}
run_sysfs_custom_load_tests()
{
RANDOM_FILE_PATH=$(setup_random_file)
RANDOM_FILE="$(basename $RANDOM_FILE_PATH)"
if load_fw_custom "$RANDOM_FILE" "$RANDOM_FILE_PATH" ; then
if ! diff -q "$RANDOM_FILE_PATH" /dev/test_firmware >/dev/null ; then
echo "$0: firmware was not loaded" >&2
exit 1
else
echo "$0: custom fallback loading mechanism works"
fi
fi
RANDOM_FILE_PATH=$(setup_random_file)
RANDOM_FILE="$(basename $RANDOM_FILE_PATH)"
if load_fw_custom "$RANDOM_FILE" "$RANDOM_FILE_PATH" ; then
if ! diff -q "$RANDOM_FILE_PATH" /dev/test_firmware >/dev/null ; then
echo "$0: firmware was not loaded" >&2
exit 1
else
echo "$0: custom fallback loading mechanism works"
fi
fi
RANDOM_FILE_REAL="$RANDOM_FILE_PATH"
FAKE_RANDOM_FILE_PATH=$(setup_random_file_fake)
FAKE_RANDOM_FILE="$(basename $FAKE_RANDOM_FILE_PATH)"
if load_fw_custom_cancel "$FAKE_RANDOM_FILE" "$RANDOM_FILE_REAL" ; then
if diff -q "$RANDOM_FILE_PATH" /dev/test_firmware >/dev/null ; then
echo "$0: firmware was expected to be cancelled" >&2
exit 1
else
echo "$0: cancelling custom fallback mechanism works"
fi
fi
}
if [ "$HAS_FW_LOADER_USER_HELPER_FALLBACK" = "yes" ]; then
run_sysfs_main_tests
fi
run_sysfs_custom_load_tests
exit 0
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