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988b0c54 DR |
1 | #!/bin/bash |
2 | ||
3 | # udelay() test script | |
4 | # | |
5 | # Test is executed by writing and reading to /sys/kernel/debug/udelay_test | |
6 | # and exercises a variety of delays to ensure that udelay() is delaying | |
7 | # at least as long as requested (as compared to ktime). | |
8 | # | |
9 | # Copyright (C) 2014 Google, Inc. | |
10 | # | |
11 | # This software is licensed under the terms of the GNU General Public | |
12 | # License version 2, as published by the Free Software Foundation, and | |
13 | # may be copied, distributed, and modified under those terms. | |
14 | # | |
15 | # This program is distributed in the hope that it will be useful, | |
16 | # but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | # GNU General Public License for more details. | |
19 | ||
20 | MODULE_NAME=udelay_test | |
21 | UDELAY_PATH=/sys/kernel/debug/udelay_test | |
22 | ||
23 | setup() | |
24 | { | |
25 | /sbin/modprobe -q $MODULE_NAME | |
26 | tmp_file=`mktemp` | |
27 | } | |
28 | ||
29 | test_one() | |
30 | { | |
31 | delay=$1 | |
32 | echo $delay > $UDELAY_PATH | |
33 | tee -a $tmp_file < $UDELAY_PATH | |
34 | } | |
35 | ||
36 | cleanup() | |
37 | { | |
38 | if [ -f $tmp_file ]; then | |
39 | rm $tmp_file | |
40 | fi | |
41 | /sbin/modprobe -q -r $MODULE_NAME | |
42 | } | |
43 | ||
44 | trap cleanup EXIT | |
45 | setup | |
46 | ||
47 | # Delay for a variety of times. | |
48 | # 1..200, 200..500 (by 10), 500..2000 (by 100) | |
49 | for (( delay = 1; delay < 200; delay += 1 )); do | |
50 | test_one $delay | |
51 | done | |
52 | for (( delay = 200; delay < 500; delay += 10 )); do | |
53 | test_one $delay | |
54 | done | |
55 | for (( delay = 500; delay <= 2000; delay += 100 )); do | |
56 | test_one $delay | |
57 | done | |
58 | ||
59 | # Search for failures | |
60 | count=`grep -c FAIL $tmp_file` | |
61 | if [ $? -eq "0" ]; then | |
62 | echo "ERROR: $count delays failed to delay long enough" | |
63 | retcode=1 | |
64 | fi | |
65 | ||
66 | exit $retcode |