From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754549AbaEGAMr (ORCPT ); Tue, 6 May 2014 20:12:47 -0400 Received: from mail-pd0-f175.google.com ([209.85.192.175]:38126 "EHLO mail-pd0-f175.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753456AbaEGAMo (ORCPT ); Tue, 6 May 2014 20:12:44 -0400 From: David Riley To: Thomas Gleixner Cc: John Stultz , Doug Anderson , linux-kernel@vger.kernel.org, David Riley Subject: [PATCH 2/2] tools: add script to test udelay Date: Tue, 6 May 2014 17:12:23 -0700 Message-Id: <1399421543-7751-3-git-send-email-davidriley@chromium.org> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1399421543-7751-1-git-send-email-davidriley@chromium.org> References: <1399421543-7751-1-git-send-email-davidriley@chromium.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This script makes use of the udelay_test module to exercise udelay() and ensure that it is delaying long enough (as compared to ktime). Signed-off-by: David Riley --- tools/time/udelay_test.sh | 66 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 66 insertions(+) create mode 100644 tools/time/udelay_test.sh diff --git a/tools/time/udelay_test.sh b/tools/time/udelay_test.sh new file mode 100644 index 0000000..12d46b9 --- /dev/null +++ b/tools/time/udelay_test.sh @@ -0,0 +1,66 @@ +#!/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 -- 1.7.9.5