67 lines
1.5 KiB
Bash
67 lines
1.5 KiB
Bash
|
#!/bin/bash
|
||
|
|
|
||
|
|
# udelay() test script
|
||
|
|
#
|
||
|
|
# Test is executed by writing and reading to /sys/kernel/debug/udelay_test
|
||
|
|
# and exercises a variety of delays to ensure that udelay() is delaying
|
||
|
|
# at least as long as requested (as compared to ktime).
|
||
|
|
#
|
||
|
|
# Copyright (C) 2014 Google, Inc.
|
||
|
|
#
|
||
|
|
# This software is licensed under the terms of the GNU General Public
|
||
|
|
# License version 2, as published by the Free Software Foundation, and
|
||
|
|
# may be copied, distributed, and modified under those terms.
|
||
|
|
#
|
||
|
|
# This program is distributed in the hope that it will be useful,
|
||
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
# GNU General Public License for more details.
|
||
|
|
|
||
|
|
MODULE_NAME=udelay_test
|
||
|
|
UDELAY_PATH=/sys/kernel/debug/udelay_test
|
||
|
|
|
||
|
|
setup()
|
||
|
|
{
|
||
|
|
/sbin/modprobe -q $MODULE_NAME
|
||
|
|
tmp_file=`mktemp`
|
||
|
|
}
|
||
|
|
|
||
|
|
test_one()
|
||
|
|
{
|
||
|
|
delay=$1
|
||
|
|
echo $delay > $UDELAY_PATH
|
||
|
|
tee -a $tmp_file < $UDELAY_PATH
|
||
|
|
}
|
||
|
|
|
||
|
|
cleanup()
|
||
|
|
{
|
||
|
|
if [ -f $tmp_file ]; then
|
||
|
|
rm $tmp_file
|
||
|
|
fi
|
||
|
|
/sbin/modprobe -q -r $MODULE_NAME
|
||
|
|
}
|
||
|
|
|
||
|
|
trap cleanup EXIT
|
||
|
|
setup
|
||
|
|
|
||
|
|
# Delay for a variety of times.
|
||
|
|
# 1..200, 200..500 (by 10), 500..2000 (by 100)
|
||
|
|
for (( delay = 1; delay < 200; delay += 1 )); do
|
||
|
|
test_one $delay
|
||
|
|
done
|
||
|
|
for (( delay = 200; delay < 500; delay += 10 )); do
|
||
|
|
test_one $delay
|
||
|
|
done
|
||
|
|
for (( delay = 500; delay <= 2000; delay += 100 )); do
|
||
|
|
test_one $delay
|
||
|
|
done
|
||
|
|
|
||
|
|
# Search for failures
|
||
|
|
count=`grep -c FAIL $tmp_file`
|
||
|
|
if [ $? -eq "0" ]; then
|
||
|
|
echo "ERROR: $count delays failed to delay long enough"
|
||
|
|
retcode=1
|
||
|
|
fi
|
||
|
|
|
||
|
|
exit $retcode
|