tools/testing/selftests/cpufreq/governor.sh

   1 #!/bin/bash
   2 # SPDX-License-Identifier: GPL-2.0
   3 #
   4 # Test governors
   5
   6 # protect against multiple inclusion
   7 if [ $FILE_GOVERNOR ]; then
   8         return 0
   9 else
  10         FILE_GOVERNOR=DONE
  11 fi
  12
  13 source cpu.sh
  14 source cpufreq.sh
  15
  16 CUR_GOV=
  17 CUR_FREQ=
  18
  19 # Find governor's directory path
  20 # $1: policy, $2: governor
  21 find_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
  33 find_current_governor()
  34 {
  35         cat $CPUFREQROOT/$1/scaling_governor
  36 }
  37
  38 # $1: policy
  39 backup_governor()
  40 {
  41         CUR_GOV=$(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
  54 restore_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, $2: governor
  85 switch_governor()
  86 {
  87         local filepath=$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
 101 switch_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, $2: policy
 124 call_for_each_governor()
 125 {
 126         local filepath=$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
 146 shuffle_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 }