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#!/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" "------------------------------------------------"
}