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selftests: firmware: send expected errors to /dev/null
[karo-tx-linux.git] / tools / testing / selftests / firmware / fw_filesystem.sh
1 #!/bin/sh
2 # This validates that the kernel will load firmware out of its list of
3 # firmware locations on disk. Since the user helper does similar work,
4 # we reset the custom load directory to a location the user helper doesn't
5 # know so we can be sure we're not accidentally testing the user helper.
6 set -e
7
8 DIR=/sys/devices/virtual/misc/test_firmware
9 TEST_DIR=$(dirname $0)
10
11 test_modprobe()
12 {
13         if [ ! -d $DIR ]; then
14                 echo "$0: $DIR not present"
15                 echo "You must have the following enabled in your kernel:"
16                 cat $TEST_DIR/config
17                 exit 1
18         fi
19 }
20
21 trap "test_modprobe" EXIT
22
23 if [ ! -d $DIR ]; then
24         modprobe test_firmware
25 fi
26
27 # CONFIG_FW_LOADER_USER_HELPER has a sysfs class under /sys/class/firmware/
28 # These days no one enables CONFIG_FW_LOADER_USER_HELPER so check for that
29 # as an indicator for CONFIG_FW_LOADER_USER_HELPER.
30 HAS_FW_LOADER_USER_HELPER=$(if [ -d /sys/class/firmware/ ]; then echo yes; else echo no; fi)
31
32 if [ "$HAS_FW_LOADER_USER_HELPER" = "yes" ]; then
33         OLD_TIMEOUT=$(cat /sys/class/firmware/timeout)
34 fi
35
36 OLD_FWPATH=$(cat /sys/module/firmware_class/parameters/path)
37
38 FWPATH=$(mktemp -d)
39 FW="$FWPATH/test-firmware.bin"
40
41 test_finish()
42 {
43         if [ "$HAS_FW_LOADER_USER_HELPER" = "yes" ]; then
44                 echo "$OLD_TIMEOUT" >/sys/class/firmware/timeout
45         fi
46         echo -n "$OLD_PATH" >/sys/module/firmware_class/parameters/path
47         rm -f "$FW"
48         rmdir "$FWPATH"
49 }
50
51 trap "test_finish" EXIT
52
53 if [ "$HAS_FW_LOADER_USER_HELPER" = "yes" ]; then
54         # Turn down the timeout so failures don't take so long.
55         echo 1 >/sys/class/firmware/timeout
56 fi
57
58 # Set the kernel search path.
59 echo -n "$FWPATH" >/sys/module/firmware_class/parameters/path
60
61 # This is an unlikely real-world firmware content. :)
62 echo "ABCD0123" >"$FW"
63
64 NAME=$(basename "$FW")
65
66 if printf '\000' >"$DIR"/trigger_request 2> /dev/null; then
67         echo "$0: empty filename should not succeed" >&2
68         exit 1
69 fi
70
71 if printf '\000' >"$DIR"/trigger_async_request 2> /dev/null; then
72         echo "$0: empty filename should not succeed (async)" >&2
73         exit 1
74 fi
75
76 # Request a firmware that doesn't exist, it should fail.
77 if echo -n "nope-$NAME" >"$DIR"/trigger_request 2> /dev/null; then
78         echo "$0: firmware shouldn't have loaded" >&2
79         exit 1
80 fi
81 if diff -q "$FW" /dev/test_firmware >/dev/null ; then
82         echo "$0: firmware was not expected to match" >&2
83         exit 1
84 else
85         if [ "$HAS_FW_LOADER_USER_HELPER" = "yes" ]; then
86                 echo "$0: timeout works"
87         fi
88 fi
89
90 # This should succeed via kernel load or will fail after 1 second after
91 # being handed over to the user helper, which won't find the fw either.
92 if ! echo -n "$NAME" >"$DIR"/trigger_request ; then
93         echo "$0: could not trigger request" >&2
94         exit 1
95 fi
96
97 # Verify the contents are what we expect.
98 if ! diff -q "$FW" /dev/test_firmware >/dev/null ; then
99         echo "$0: firmware was not loaded" >&2
100         exit 1
101 else
102         echo "$0: filesystem loading works"
103 fi
104
105 # Try the asynchronous version too
106 if ! echo -n "$NAME" >"$DIR"/trigger_async_request ; then
107         echo "$0: could not trigger async request" >&2
108         exit 1
109 fi
110
111 # Verify the contents are what we expect.
112 if ! diff -q "$FW" /dev/test_firmware >/dev/null ; then
113         echo "$0: firmware was not loaded (async)" >&2
114         exit 1
115 else
116         echo "$0: async filesystem loading works"
117 fi
118
119 exit 0