1 #!/bin/bash
2 # SPDX-License-Identifier: GPL-2.0-only
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 #
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
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