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Commit | Line | Data |
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988b0c54 | 1 | #!/bin/bash |
9c92ab61 | 2 | # SPDX-License-Identifier: GPL-2.0-only |
988b0c54 DR |
3 | |
4 | # udelay() test script | |
5 | # | |
6 | # Test is executed by writing and reading to /sys/kernel/debug/udelay_test | |
7 | # and exercises a variety of delays to ensure that udelay() is delaying | |
8 | # at least as long as requested (as compared to ktime). | |
9 | # | |
10 | # Copyright (C) 2014 Google, Inc. | |
11 | # | |
988b0c54 DR |
12 | |
13 | MODULE_NAME=udelay_test | |
14 | UDELAY_PATH=/sys/kernel/debug/udelay_test | |
15 | ||
16 | setup() | |
17 | { | |
18 | /sbin/modprobe -q $MODULE_NAME | |
19 | tmp_file=`mktemp` | |
20 | } | |
21 | ||
22 | test_one() | |
23 | { | |
24 | delay=$1 | |
25 | echo $delay > $UDELAY_PATH | |
26 | tee -a $tmp_file < $UDELAY_PATH | |
27 | } | |
28 | ||
29 | cleanup() | |
30 | { | |
31 | if [ -f $tmp_file ]; then | |
32 | rm $tmp_file | |
33 | fi | |
34 | /sbin/modprobe -q -r $MODULE_NAME | |
35 | } | |
36 | ||
37 | trap cleanup EXIT | |
38 | setup | |
39 | ||
40 | # Delay for a variety of times. | |
41 | # 1..200, 200..500 (by 10), 500..2000 (by 100) | |
42 | for (( delay = 1; delay < 200; delay += 1 )); do | |
43 | test_one $delay | |
44 | done | |
45 | for (( delay = 200; delay < 500; delay += 10 )); do | |
46 | test_one $delay | |
47 | done | |
48 | for (( delay = 500; delay <= 2000; delay += 100 )); do | |
49 | test_one $delay | |
50 | done | |
51 | ||
52 | # Search for failures | |
53 | count=`grep -c FAIL $tmp_file` | |
54 | if [ $? -eq "0" ]; then | |
55 | echo "ERROR: $count delays failed to delay long enough" | |
56 | retcode=1 | |
57 | fi | |
58 | ||
59 | exit $retcode |