FM / cpufreq

/usr/src/linux-headers-5.15.0-190/tools/testing/selftests/cpufreq/

/usr/src/linux-headers-5.15.0-190/tools/testing/selftests/cpufreq

Name	Size	Mode	Actions
cpu.sh	1290	0755	edit dl rm
cpufreq.sh	4654	0755	edit dl rm
governor.sh	2784	0755	edit dl rm
main.sh	3578	0755	edit dl rm
Makefile	161	0644	edit dl rm
module.sh	4938	0755	edit dl rm
special-tests.sh	1997	0755	edit dl rm

Edit: /usr/src/linux-headers-5.15.0-190/tools/testing/selftests/cpufreq/governor.sh (2784B)

#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# 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
}

# param:
# $1: cpu, $2: governor
__switch_governor_for_cpu()
{
	echo $2 > $CPUROOT/$1/cpufreq/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" "------------------------------------------------"
}

cmd: