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Commit e66d5b67 authored by Viresh Kumar's avatar Viresh Kumar Committed by Shuah Khan
Browse files

selftest: cpufreq: Add support for cpufreq tests 



This patch adds supports for basic cpufreq tests, which can be performed
independent of any platform.

It does basic tests for now, like
- reading all cpufreq files
- trying to update them
- switching frequencies
- switching governors

This can be extended to have more specific tests later on.

Signed-off-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: default avatarShuah Khan <shuahkh@osg.samsung.com>
parent 6320303f

tools/testing/selftests/Makefile

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Original line number Diff line number Diff line 
TARGETS =  bpf

TARGETS += breakpoints

TARGETS += capabilities

TARGETS += cpufreq

TARGETS += cpu-hotplug

TARGETS += efivarfs

TARGETS += exec

tools/testing/selftests/cpufreq/Makefile

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Original line number Diff line number Diff line 
all:



TEST_PROGS := main.sh

TEST_FILES := cpu.sh cpufreq.sh governor.sh



include ../lib.mk



clean:

tools/testing/selftests/cpufreq/cpu.sh

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#!/bin/bash

#

# CPU helpers



# protect against multiple inclusion

if [ $FILE_CPU ]; then

	return 0

else

	FILE_CPU=DONE

fi



source cpufreq.sh



for_each_cpu()

{

	cpus=$(ls $CPUROOT | grep "cpu[0-9].*")

	for cpu in $cpus; do

		$@ $cpu

	done

}



for_each_non_boot_cpu()

{

	cpus=$(ls $CPUROOT | grep "cpu[1-9].*")

	for cpu in $cpus; do

		$@ $cpu

	done

}



#$1: cpu

offline_cpu()

{

	printf "Offline $1\n"

	echo 0 > $CPUROOT/$1/online

}



#$1: cpu

online_cpu()

{

	printf "Online $1\n"

	echo 1 > $CPUROOT/$1/online

}



#$1: cpu

reboot_cpu()

{

	offline_cpu $1

	online_cpu $1

}



# Reboot CPUs

# param: number of times we want to run the loop

reboot_cpus()

{

	printf "** Test: Running ${FUNCNAME[0]} for $1 loops **\n\n"



	for i in `seq 1 $1`; do

		for_each_non_boot_cpu offline_cpu

		for_each_non_boot_cpu online_cpu

		printf "\n"

	done



	printf "\n%s\n\n" "------------------------------------------------"

}



# Prints warning for all CPUs with missing cpufreq directory

print_unmanaged_cpus()

{

	for_each_cpu cpu_should_have_cpufreq_directory

}



# Counts CPUs with cpufreq directories

count_cpufreq_managed_cpus()

{

	count=0;



	for cpu in `ls $CPUROOT | grep "cpu[0-9].*"`; do

		if [ -d $CPUROOT/$cpu/cpufreq ]; then

			let count=count+1;

		fi

	done



	echo $count;

}

tools/testing/selftests/cpufreq/cpufreq.sh

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Original line number Diff line number Diff line 
#!/bin/bash



# protect against multiple inclusion

if [ $FILE_CPUFREQ ]; then

	return 0

else

	FILE_CPUFREQ=DONE

fi



source cpu.sh





# $1: cpu

cpu_should_have_cpufreq_directory()

{

	if [ ! -d $CPUROOT/$1/cpufreq ]; then

		printf "Warning: No cpufreq directory present for $1\n"

	fi

}



cpu_should_not_have_cpufreq_directory()

{

	if [ -d $CPUROOT/$1/cpufreq ]; then

		printf "Warning: cpufreq directory present for $1\n"

	fi

}



for_each_policy()

{

	policies=$(ls $CPUFREQROOT| grep "policy[0-9].*")

	for policy in $policies; do

		$@ $policy

	done

}



for_each_policy_concurrent()

{

	policies=$(ls $CPUFREQROOT| grep "policy[0-9].*")

	for policy in $policies; do

		$@ $policy &

	done

}



# $1: Path

read_cpufreq_files_in_dir()

{

	local files=`ls $1`



	printf "Printing directory: $1\n\n"



	for file in $files; do

		if [ -f $1/$file ]; then

			printf "$file:"

			cat $1/$file

		else

			printf "\n"

			read_cpufreq_files_in_dir "$1/$file"

		fi

	done

	printf "\n"

}





read_all_cpufreq_files()

{

	printf "** Test: Running ${FUNCNAME[0]} **\n\n"



	read_cpufreq_files_in_dir $CPUFREQROOT



	printf "%s\n\n" "------------------------------------------------"

}





# UPDATE CPUFREQ FILES



# $1: directory path

update_cpufreq_files_in_dir()

{

	local files=`ls $1`



	printf "Updating directory: $1\n\n"



	for file in $files; do

		if [ -f $1/$file ]; then

			# file is writable ?

			local wfile=$(ls -l $1/$file | awk '$1 ~ /^.*w.*/ { print $NF; }')



			if [ ! -z $wfile ]; then

				# scaling_setspeed is a special file and we

				# should skip updating it

				if [ $file != "scaling_setspeed" ]; then

					local val=$(cat $1/$file)

					printf "Writing $val to: $file\n"

					echo $val > $1/$file

				fi

			fi

		else

			printf "\n"

			update_cpufreq_files_in_dir "$1/$file"

		fi

	done



	printf "\n"

}



# Update all writable files with their existing values

update_all_cpufreq_files()

{

	printf "** Test: Running ${FUNCNAME[0]} **\n\n"



	update_cpufreq_files_in_dir $CPUFREQROOT



	printf "%s\n\n" "------------------------------------------------"

}





# CHANGE CPU FREQUENCIES



# $1: policy

find_current_freq()

{

	cat $CPUFREQROOT/$1/scaling_cur_freq

}



# $1: policy

# $2: frequency

set_cpu_frequency()

{

	printf "Change frequency for $1 to $2\n"

	echo $2 > $CPUFREQROOT/$1/scaling_setspeed

}



# $1: policy

test_all_frequencies()

{

	local filepath="$CPUFREQROOT/$1"



	backup_governor $1



	local found=$(switch_governor $1 "userspace")

	if [ $found = 1 ]; then

		printf "${FUNCNAME[0]}: userspace governor not available for: $1\n"

		return;

	fi



	printf "Switched governor for $1 to userspace\n\n"



	local freqs=$(cat $filepath/scaling_available_frequencies)

	printf "Available frequencies for $1: $freqs\n\n"



	# Set all frequencies one-by-one

	for freq in $freqs; do

		set_cpu_frequency $1 $freq

	done



	printf "\n"



	restore_governor $1

}



# $1: loop count

shuffle_frequency_for_all_cpus()

{

	printf "** Test: Running ${FUNCNAME[0]} for $1 loops **\n\n"



	for i in `seq 1 $1`; do

		for_each_policy test_all_frequencies

	done

	printf "\n%s\n\n" "------------------------------------------------"

}



# Basic cpufreq tests

cpufreq_basic_tests()

{

	printf "*** RUNNING CPUFREQ SANITY TESTS ***\n"

	printf "====================================\n\n"



	count=$(count_cpufreq_managed_cpus)

	if [ $count = 0 ]; then

		printf "No cpu is managed by cpufreq core, exiting\n"

		exit;

	else

		printf "CPUFreq manages: $count CPUs\n\n"

	fi



	# Detect & print which CPUs are not managed by cpufreq

	print_unmanaged_cpus



	# read/update all cpufreq files

	read_all_cpufreq_files

	update_all_cpufreq_files



	# hotplug cpus

	reboot_cpus 5



	# Test all frequencies

	shuffle_frequency_for_all_cpus 2



	# Test all governors

	shuffle_governors_for_all_cpus 1

}

tools/testing/selftests/cpufreq/governor.sh

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#!/bin/bash

#

# Test governors



# protect against multiple inclusion

if [ $FILE_GOVERNOR ]; then

	return 0

else

	FILE_GOVERNOR=DONE

fi



source cpu.sh

source cpufreq.sh



CUR_GOV=

CUR_FREQ=



# Find governor's directory path

# $1: policy, $2: governor

find_gov_directory()

{

	if [ -d $CPUFREQROOT/$2 ]; then

		printf "$CPUFREQROOT/$2\n"

	elif [ -d $CPUFREQROOT/$1/$2 ]; then

		printf "$CPUFREQROOT/$1/$2\n"

	else

		printf "INVALID\n"

	fi

}



# $1: policy

find_current_governor()

{

	cat $CPUFREQROOT/$1/scaling_governor

}



# $1: policy

backup_governor()

{

	CUR_GOV=$(find_current_governor $1)



	printf "Governor backup done for $1: $CUR_GOV\n"



	if [ $CUR_GOV == "userspace" ]; then

		CUR_FREQ=$(find_current_freq $1)

		printf "Governor frequency backup done for $1: $CUR_FREQ\n"

	fi



	printf "\n"

}



# $1: policy

restore_governor()

{

	__switch_governor $1 $CUR_GOV



	printf "Governor restored for $1 to $CUR_GOV\n"



	if [ $CUR_GOV == "userspace" ]; then

		set_cpu_frequency $1 $CUR_FREQ

		printf "Governor frequency restored for $1: $CUR_FREQ\n"

	fi



	printf "\n"

}



# param:

# $1: policy, $2: governor

__switch_governor()

{

	echo $2 > $CPUFREQROOT/$1/scaling_governor

}



# SWITCH GOVERNORS



# $1: cpu, $2: governor

switch_governor()

{

	local filepath=$CPUFREQROOT/$1/scaling_available_governors



	# check if governor is available

	local found=$(cat $filepath | grep $2 | wc -l)

	if [ $found = 0 ]; then

		echo 1;

		return

	fi



	__switch_governor $1 $2

	echo 0;

}



# $1: policy, $2: governor

switch_show_governor()

{

	cur_gov=find_current_governor

	if [ $cur_gov == "userspace" ]; then

		cur_freq=find_current_freq

	fi



	# switch governor

	__switch_governor $1 $2



	printf "\nSwitched governor for $1 to $2\n\n"



	if [ $2 == "userspace" -o $2 == "powersave" -o $2 == "performance" ]; then

		printf "No files to read for $2 governor\n\n"

		return

	fi



	# show governor files

	local govpath=$(find_gov_directory $1 $2)

	read_cpufreq_files_in_dir $govpath

}



# $1: function to be called, $2: policy

call_for_each_governor()

{

	local filepath=$CPUFREQROOT/$2/scaling_available_governors



	# Exit if cpu isn't managed by cpufreq core

	if [ ! -f $filepath ]; then

		return;

	fi



	backup_governor $2



	local governors=$(cat $filepath)

	printf "Available governors for $2: $governors\n"



	for governor in $governors; do

		$1 $2 $governor

	done



	restore_governor $2

}



# $1: loop count

shuffle_governors_for_all_cpus()

{

	printf "** Test: Running ${FUNCNAME[0]} for $1 loops **\n\n"



	for i in `seq 1 $1`; do

		for_each_policy call_for_each_governor switch_show_governor

	done

	printf "%s\n\n" "------------------------------------------------"

}