[v2] rcu/rcu_torture.sh: Rewrite test

1) Cleanup and convert to new API
2) Update valid rcutorture types(rcu, srcu, srcud, tasks)

Note:
Exclude valid busted* types(busted, busted_srcud) that check
the test itself and expect failures, suggested by:
https://www.spinics.net/lists/kernel/msg3045252.html

Signed-off-by: Xiao Yang <ice_yangxiao@163.com>

v2:
1) Add check for invalid rcutorture types
2) Remove unnecessary code and update descriptions
3) Exclude busted* types
---
 testcases/kernel/device-drivers/rcu/rcu_torture.sh | 139 +++++++++------------
 1 file changed, 59 insertions(+), 80 deletions(-)

On 06/07/2019 11:23 PM, Xiao Yang wrote:
> 1) Cleanup and convert to new API
> 2) Update valid rcutorture types(rcu, srcu, srcud, tasks)
>
> Note:
> Exclude valid busted* types(busted, busted_srcud) that check
> the test itself and expect failures, suggested by:
> https://www.spinics.net/lists/kernel/msg3045252.html
>
> Signed-off-by: Xiao Yang <ice_yangxiao@163.com>
>
> v2:
> 1) Add check for invalid rcutorture types
> 2) Remove unnecessary code and update descriptions
> 3) Exclude busted* types
Hi,

Sorry, the changelog was misplaced.
Please ignore it and I will resend the v2 patch.

Best Regards,
Xiao Yang
> ---
>   testcases/kernel/device-drivers/rcu/rcu_torture.sh | 139 +++++++++------------
>   1 file changed, 59 insertions(+), 80 deletions(-)
>
> diff --git a/testcases/kernel/device-drivers/rcu/rcu_torture.sh b/testcases/kernel/device-drivers/rcu/rcu_torture.sh
> index c3739f9..5549bd2 100755
> --- a/testcases/kernel/device-drivers/rcu/rcu_torture.sh
> +++ b/testcases/kernel/device-drivers/rcu/rcu_torture.sh
> @@ -1,20 +1,7 @@
>   #!/bin/sh
> +# SPDX-License-Identifier: GPL-2.0-or-later
>   # Copyright (c) 2014-2015 Oracle and/or its affiliates. All Rights Reserved.
> -#
> -# This program is free software; you can redistribute it and/or
> -# modify it under the terms of the GNU General Public License as
> -# published by the Free Software Foundation; either version 2 of
> -# the License, or (at your option) any later version.
> -#
> -# This program is distributed in the hope that it would 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.
> -#
> -# You should have received a copy of the GNU General Public License
> -# along with this program; if not, write the Free Software Foundation,
> -# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
> -#
> +# Copyright (C) 2019 Xiao Yang <ice_yangxiao@163.com>
>   # Author: Alexey Kodanev <alexey.kodanev@oracle.com>
>   #
>   # One of the possible ways to test RCU is to use rcutorture kernel module.
> @@ -23,89 +10,81 @@
>   # dmesg output for module's test results.
>   # For more information, please read Linux Documentation: RCU/torture.txt
>   
> -TCID="rcu_torture"
> -TST_TOTAL=14
> -TST_CLEANUP=cleanup
> +TST_CNT=4
> +TST_SETUP=rcutorture_setup
> +TST_TESTFUNC=do_test
> +TST_NEEDS_ROOT=1
> +TST_NEEDS_CMDS="modprobe rmmod dmesg sed tail"
> +TST_OPTS="t:w:"
> +TST_USAGE=rcutorture_usage
> +TST_PARSE_ARGS=rcutorture_parse_args
>   
> -. test.sh
> +. tst_test.sh
>   
>   # default options
> -test_time=60
> +test_time=30
>   num_writers=5
>   
> -while getopts :ht:w: opt; do
> -	case "$opt" in
> -	h)
> -		echo "Usage:"
> -		echo "h        help"
> -		echo "t x      time in seconds for each test-case"
> -		echo "w x      number of writers"
> -		exit 0
> -	;;
> -	t) test_time=$OPTARG ;;
> -	w) num_writers=$OPTARG ;;
> -	*)
> -		tst_brkm TBROK "unknown option: $opt"
> -	;;
> -	esac
> -done
> -
> -cleanup()
> +rcutorture_usage()
>   {
> -	tst_resm TINFO "cleanup"
> -	rmmod rcutorture > /dev/null 2>&1
> +	echo "Usage:"
> +	echo "-t x    time in seconds for each test-case"
> +	echo "-w x    number of writers"
>   }
>   
> -tst_require_root
> +rcutorture_parse_args()
> +{
> +	case $1 in
> +	t) test_time=$2 ;;
> +	w) num_writers=$2 ;;
> +	esac
> +}
>   
> -# check if module is present
> -modprobe rcutorture > /dev/null 2>&1 || \
> -	tst_brkm TCONF "Test requires rcutorture module"
> -rmmod rcutorture > /dev/null 2>&1
> +rcutorture_setup()
> +{
> +	# do test by inserting and removing rcutorture module
> +	# so check if it is built-in, loaded or unbuilt
> +	modprobe -n --first-time rcutorture >/dev/null 2>&1 || \
> +		tst_brk TCONF "built-in, loaded or unbuilt rcutorture"
> +}
>   
> -trap cleanup INT
> +rcutorture_test()
> +{
> +	local rcu_type=$1
>   
> -rcu_type="rcu rcu_bh srcu sched"
> +	tst_res TINFO "${rcu_type}-torture: running ${test_time} sec..."
>   
> -if tst_kvcmp -lt "3.12"; then
> -	rcu_type="$rcu_type rcu_sync rcu_expedited rcu_bh_sync rcu_bh_expedited \
> -	          srcu_sync srcu_expedited sched_sync sched_expedited"
> +	modprobe rcutorture nfakewriters=${num_writers} \
> +		torture_type=${rcu_type} >/dev/null 2>&1
> +	if [ $? -ne 0 ]; then
> +		dmesg | grep -q "invalid torture type: \"${rcu_type}\"" && \
> +			tst_brk TCONF "invalid ${rcu_type} type"
>   
> -	if tst_kvcmp -lt "3.11"; then
> -		rcu_type="$rcu_type srcu_raw srcu_raw_sync"
> +		tst_brk TBROK "failed to load module"
>   	fi
> -fi
> -
> -TST_TOTAL=$(echo "$rcu_type" | wc -w)
> -
> -est_time=`echo "scale=2; $test_time * $TST_TOTAL / 60 " | bc`
> -tst_resm TINFO "estimate time $est_time min"
> -
> -for type in $rcu_type; do
> -
> -	tst_resm TINFO "$type: running $test_time sec..."
> -
> -	modprobe rcutorture nfakewriters=$num_writers \
> -	         stat_interval=60 test_no_idle_hz=1 shuffle_interval=3 \
> -	         stutter=5 irqreader=1 fqs_duration=0 fqs_holdoff=0 \
> -	         fqs_stutter=3 test_boost=1 test_boost_interval=7 \
> -	         test_boost_duration=4 shutdown_secs=0 \
> -	         stall_cpu=0 stall_cpu_holdoff=10 n_barrier_cbs=0 \
> -	         onoff_interval=0 onoff_holdoff=0 torture_type=$type \
> -	         > /dev/null 2>&1 || tst_brkm TBROK "failed to load module"
>   
> -	sleep $test_time
> +	sleep ${test_time}
>   
> -	rmmod rcutorture > /dev/null 2>&1 || \
> -		tst_brkm TBROK "failed to unload module"
> +	rmmod rcutorture >/dev/null 2>&1 || \
> +		tst_brk TBROK "failed to unload module"
>   
>   	# check module status in dmesg
> -	result_str=`dmesg | sed -nE '$s/.*End of test: ([A-Z]+):.*/\1/p'`
> -	if [ "$result_str" = "SUCCESS" ]; then
> -		tst_resm TPASS "$type: completed"
> +	local res=$(dmesg | sed -nE "s/.* ${rcu_type}-torture:.* End of test: (.*): .*/\1/p" | tail -n1)
> +	if [ "$res" = "SUCCESS" ]; then
> +		tst_res TPASS "${rcu_type}-torture: $res"
>   	else
> -		tst_resm TFAIL "$type: $result_str, see dmesg"
> +		tst_res TFAIL "${rcu_type}-torture: $res, see dmesg"
>   	fi
> -done
> +}
> +
> +do_test()
> +{
> +	case $1 in
> +	1) rcutorture_test rcu;;
> +	2) rcutorture_test srcu;;
> +	3) rcutorture_test srcud;;
> +	4) rcutorture_test tasks;;
> +	esac
> +}
>   
> -tst_exit
> +tst_run