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