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Файловый менеджер - Редактировать - /usr/src/linux-headers-5.4.0-200/tools/testing/selftests/firmware/fw_fallback.sh

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#!/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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