governor.sh

  1#!/bin/bash
  2# SPDX-License-Identifier: GPL-2.0
  3#
  4# Test governors
  5
  6# protect against multiple inclusion
  7if [ $FILE_GOVERNOR ]; then
  8	return 0
  9else
 10	FILE_GOVERNOR=DONE
 11fi
 12
 13source cpu.sh
 14source cpufreq.sh
 15
 16CUR_GOV=
 17CUR_FREQ=
 18
 19# Find governor's directory path
 20# $1: policy, $2: governor
 21find_gov_directory()
 22{
 23	if [ -d $CPUFREQROOT/$2 ]; then
 24		printf "$CPUFREQROOT/$2\n"
 25	elif [ -d $CPUFREQROOT/$1/$2 ]; then
 26		printf "$CPUFREQROOT/$1/$2\n"
 27	else
 28		printf "INVALID\n"
 29	fi
 30}
 31
 32# $1: policy
 33find_current_governor()
 34{
 35	cat $CPUFREQROOT/$1/scaling_governor
 36}
 37
 38# $1: policy
 39backup_governor()
 40{
 41	CUR_GOV=$(find_current_governor $1)
 42
 43	printf "Governor backup done for $1: $CUR_GOV\n"
 44
 45	if [ $CUR_GOV == "userspace" ]; then
 46		CUR_FREQ=$(find_current_freq $1)
 47		printf "Governor frequency backup done for $1: $CUR_FREQ\n"
 48	fi
 49
 50	printf "\n"
 51}
 52
 53# $1: policy
 54restore_governor()
 55{
 56	__switch_governor $1 $CUR_GOV
 57
 58	printf "Governor restored for $1 to $CUR_GOV\n"
 59
 60	if [ $CUR_GOV == "userspace" ]; then
 61		set_cpu_frequency $1 $CUR_FREQ
 62		printf "Governor frequency restored for $1: $CUR_FREQ\n"
 63	fi
 64
 65	printf "\n"
 66}
 67
 68# param:
 69# $1: policy, $2: governor
 70__switch_governor()
 71{
 72	echo $2 > $CPUFREQROOT/$1/scaling_governor
 73}
 74
 75# param:
 76# $1: cpu, $2: governor
 77__switch_governor_for_cpu()
 78{
 79	echo $2 > $CPUROOT/$1/cpufreq/scaling_governor
 80}
 81
 82# SWITCH GOVERNORS
 83
 84# $1: cpu, $2: governor
 85switch_governor()
 86{
 87	local filepath=$CPUFREQROOT/$1/scaling_available_governors
 88
 89	# check if governor is available
 90	local found=$(cat $filepath | grep $2 | wc -l)
 91	if [ $found = 0 ]; then
 92		echo 1;
 93		return
 94	fi
 95
 96	__switch_governor $1 $2
 97	echo 0;
 98}
 99
100# $1: policy, $2: governor
101switch_show_governor()
102{
103	cur_gov=find_current_governor
104	if [ $cur_gov == "userspace" ]; then
105		cur_freq=find_current_freq
106	fi
107
108	# switch governor
109	__switch_governor $1 $2
110
111	printf "\nSwitched governor for $1 to $2\n\n"
112
113	if [ $2 == "userspace" -o $2 == "powersave" -o $2 == "performance" ]; then
114		printf "No files to read for $2 governor\n\n"
115		return
116	fi
117
118	# show governor files
119	local govpath=$(find_gov_directory $1 $2)
120	read_cpufreq_files_in_dir $govpath
121}
122
123# $1: function to be called, $2: policy
124call_for_each_governor()
125{
126	local filepath=$CPUFREQROOT/$2/scaling_available_governors
127
128	# Exit if cpu isn't managed by cpufreq core
129	if [ ! -f $filepath ]; then
130		return;
131	fi
132
133	backup_governor $2
134
135	local governors=$(cat $filepath)
136	printf "Available governors for $2: $governors\n"
137
138	for governor in $governors; do
139		$1 $2 $governor
140	done
141
142	restore_governor $2
143}
144
145# $1: loop count
146shuffle_governors_for_all_cpus()
147{
148	printf "** Test: Running ${FUNCNAME[0]} for $1 loops **\n\n"
149
150	for i in `seq 1 $1`; do
151		for_each_policy call_for_each_governor switch_show_governor
152	done
153	printf "%s\n\n" "------------------------------------------------"
154}