60 lines · bash
1#!/bin/bash2# SPDX-License-Identifier: GPL-2.0-only3 4# udelay() test script5#6# Test is executed by writing and reading to /sys/kernel/debug/udelay_test7# and exercises a variety of delays to ensure that udelay() is delaying8# at least as long as requested (as compared to ktime).9#10# Copyright (C) 2014 Google, Inc.11#12 13MODULE_NAME=udelay_test14UDELAY_PATH=/sys/kernel/debug/udelay_test15 16setup()17{18 /sbin/modprobe -q $MODULE_NAME19 tmp_file=`mktemp`20}21 22test_one()23{24 delay=$125 echo $delay > $UDELAY_PATH26 tee -a $tmp_file < $UDELAY_PATH27}28 29cleanup()30{31 if [ -f $tmp_file ]; then32 rm $tmp_file33 fi34 /sbin/modprobe -q -r $MODULE_NAME35}36 37trap cleanup EXIT38setup39 40# Delay for a variety of times.41# 1..200, 200..500 (by 10), 500..2000 (by 100)42for (( delay = 1; delay < 200; delay += 1 )); do43 test_one $delay44done45for (( delay = 200; delay < 500; delay += 10 )); do46 test_one $delay47done48for (( delay = 500; delay <= 2000; delay += 100 )); do49 test_one $delay50done51 52# Search for failures53count=`grep -c FAIL $tmp_file`54if [ $? -eq "0" ]; then55 echo "ERROR: $count delays failed to delay long enough"56 retcode=157fi58 59exit $retcode60