1 #!/bin/bash 1 #!/bin/bash
2 # SPDX-License-Identifier: GPL-2.0-only <<
3 2
4 # udelay() test script 3 # udelay() test script
5 # 4 #
6 # Test is executed by writing and reading to / 5 # Test is executed by writing and reading to /sys/kernel/debug/udelay_test
7 # and exercises a variety of delays to ensure 6 # and exercises a variety of delays to ensure that udelay() is delaying
8 # at least as long as requested (as compared t 7 # at least as long as requested (as compared to ktime).
9 # 8 #
10 # Copyright (C) 2014 Google, Inc. 9 # Copyright (C) 2014 Google, Inc.
11 # 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.
12 19
13 MODULE_NAME=udelay_test 20 MODULE_NAME=udelay_test
14 UDELAY_PATH=/sys/kernel/debug/udelay_test 21 UDELAY_PATH=/sys/kernel/debug/udelay_test
15 22
16 setup() 23 setup()
17 { 24 {
18 /sbin/modprobe -q $MODULE_NAME 25 /sbin/modprobe -q $MODULE_NAME
19 tmp_file=`mktemp` 26 tmp_file=`mktemp`
20 } 27 }
21 28
22 test_one() 29 test_one()
23 { 30 {
24 delay=$1 31 delay=$1
25 echo $delay > $UDELAY_PATH 32 echo $delay > $UDELAY_PATH
26 tee -a $tmp_file < $UDELAY_PATH 33 tee -a $tmp_file < $UDELAY_PATH
27 } 34 }
28 35
29 cleanup() 36 cleanup()
30 { 37 {
31 if [ -f $tmp_file ]; then 38 if [ -f $tmp_file ]; then
32 rm $tmp_file 39 rm $tmp_file
33 fi 40 fi
34 /sbin/modprobe -q -r $MODULE_NAME 41 /sbin/modprobe -q -r $MODULE_NAME
35 } 42 }
36 43
37 trap cleanup EXIT 44 trap cleanup EXIT
38 setup 45 setup
39 46
40 # Delay for a variety of times. 47 # Delay for a variety of times.
41 # 1..200, 200..500 (by 10), 500..2000 (by 100) 48 # 1..200, 200..500 (by 10), 500..2000 (by 100)
42 for (( delay = 1; delay < 200; delay += 1 )); 49 for (( delay = 1; delay < 200; delay += 1 )); do
43 test_one $delay 50 test_one $delay
44 done 51 done
45 for (( delay = 200; delay < 500; delay += 10 ) 52 for (( delay = 200; delay < 500; delay += 10 )); do
46 test_one $delay 53 test_one $delay
47 done 54 done
48 for (( delay = 500; delay <= 2000; delay += 10 55 for (( delay = 500; delay <= 2000; delay += 100 )); do
49 test_one $delay 56 test_one $delay
50 done 57 done
51 58
52 # Search for failures 59 # Search for failures
53 count=`grep -c FAIL $tmp_file` 60 count=`grep -c FAIL $tmp_file`
54 if [ $? -eq "0" ]; then 61 if [ $? -eq "0" ]; then
55 echo "ERROR: $count delays failed to d 62 echo "ERROR: $count delays failed to delay long enough"
56 retcode=1 63 retcode=1
57 fi 64 fi
58 65
59 exit $retcode 66 exit $retcode
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