#!/bin/bash
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# SPDX-License-Identifier: GPL-2.0-only
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# udelay() test script
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#
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# Test is executed by writing and reading to /sys/kernel/debug/udelay_test
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# and exercises a variety of delays to ensure that udelay() is delaying
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# at least as long as requested (as compared to ktime).
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#
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# Copyright (C) 2014 Google, Inc.
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#
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MODULE_NAME=udelay_test
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UDELAY_PATH=/sys/kernel/debug/udelay_test
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setup()
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{
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/sbin/modprobe -q $MODULE_NAME
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tmp_file=`mktemp`
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}
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test_one()
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{
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delay=$1
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echo $delay > $UDELAY_PATH
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tee -a $tmp_file < $UDELAY_PATH
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}
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cleanup()
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{
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if [ -f $tmp_file ]; then
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rm $tmp_file
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fi
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/sbin/modprobe -q -r $MODULE_NAME
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}
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trap cleanup EXIT
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setup
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# Delay for a variety of times.
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# 1..200, 200..500 (by 10), 500..2000 (by 100)
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for (( delay = 1; delay < 200; delay += 1 )); do
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test_one $delay
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done
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for (( delay = 200; delay < 500; delay += 10 )); do
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test_one $delay
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done
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for (( delay = 500; delay <= 2000; delay += 100 )); do
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test_one $delay
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done
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# Search for failures
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count=`grep -c FAIL $tmp_file`
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if [ $? -eq "0" ]; then
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echo "ERROR: $count delays failed to delay long enough"
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retcode=1
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fi
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exit $retcode
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