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