summaryrefslogtreecommitdiff
path: root/tools/testing/selftests/firmware/fw_fallback.sh
blob: 8f511035f78331410fdba45ebea6081345cdce4c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
#!/bin/sh
# 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

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
}

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()
{
	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
}


load_fw_custom_cancel()
{
	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
}

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
}

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: 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

load_fw_custom "$NAME" "$FW"
if ! diff -q "$FW" /dev/test_firmware >/dev/null ; then
	echo "$0: firmware was not loaded" >&2
	exit 1
else
	echo "$0: custom fallback loading mechanism works"
fi

load_fw_custom_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 custom 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

exit 0