tools/testing/selftests/cpufreq/governor.sh

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