Quelle  governor.sh   Sprache: Shell

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