1# Copyright 2016 Google Inc. 2# 3# Use of this source code is governed by a BSD-style license that can be 4# found in the LICENSE file. 5 6from __future__ import print_function 7from _hardware import Hardware 8import sys 9import time 10 11class HardwareAndroid(Hardware): 12 def __init__(self, adb): 13 Hardware.__init__(self) 14 self.warmup_time = 5 15 self._adb = adb 16 self.desiredClock = 0.66 17 18 if self._adb.root(): 19 self._adb.remount() 20 21 def __enter__(self): 22 Hardware.__enter__(self) 23 if not self._adb.is_root() and self._adb.root(): 24 self._adb.remount() 25 26 self._adb.shell('\n'.join([ 27 # turn on airplane mode. 28 ''' 29 settings put global airplane_mode_on 1''', 30 31 # disable GPS. 32 ''' 33 settings put secure location_providers_allowed -gps 34 settings put secure location_providers_allowed -wifi 35 settings put secure location_providers_allowed -network'''])) 36 37 if self._adb.is_root(): 38 39 # For explanation of variance reducing steps, see 40 # https://g3doc.corp.google.com/engedu/portal/android/g3doc/learn/develop/performance/content/best/reliable-startup-latency.md?cl=head 41 42 self._adb.shell('\n'.join([ 43 # disable bluetooth, wifi, and mobile data. 44 ''' 45 service call bluetooth_manager 8 46 svc wifi disable 47 svc data disable''', 48 49 # kill the gui. 50 ''' 51 setprop ctl.stop media 52 setprop ctl.stop zygote 53 setprop ctl.stop surfaceflinger 54 setprop ctl.stop drm''', 55 56 # disable ASLR 57 ''' 58 echo 0 > /proc/sys/kernel/randomize_va_space''', 59 ])) 60 61 self.lock_top_three_cores() 62 63 self.lock_adreno_gpu() 64 65 else: 66 print("WARNING: no adb root access; results may be unreliable.", 67 file=sys.stderr) 68 69 return self 70 71 def __exit__(self, exception_type, exception_value, traceback): 72 Hardware.__exit__(self, exception_type, exception_value, traceback) 73 self._adb.reboot() # some devices struggle waking up; just hard reboot. 74 75 def sanity_check(self): 76 Hardware.sanity_check(self) 77 78 def print_debug_diagnostics(self): 79 # search for and print thermal trip points that may have been exceeded. 80 self._adb.shell('''\ 81 THERMALDIR=/sys/class/thermal 82 if [ ! -d $THERMALDIR ]; then 83 exit 84 fi 85 for ZONE in $(cd $THERMALDIR; echo thermal_zone*); do 86 cd $THERMALDIR/$ZONE 87 if [ ! -e mode ] || grep -Fxqv enabled mode || [ ! -e trip_point_0_temp ]; then 88 continue 89 fi 90 TEMP=$(cat temp) 91 TRIPPOINT=trip_point_0_temp 92 if [ $TEMP -le $(cat $TRIPPOINT) ]; then 93 echo "$ZONE ($(cat type)): temp=$TEMP <= $TRIPPOINT=$(cat $TRIPPOINT)" 1>&2 94 else 95 let i=1 96 while [ -e trip_point_${i}_temp ] && 97 [ $TEMP -gt $(cat trip_point_${i}_temp) ]; do 98 TRIPPOINT=trip_point_${i}_temp 99 let i=i+1 100 done 101 echo "$ZONE ($(cat type)): temp=$TEMP > $TRIPPOINT=$(cat $TRIPPOINT)" 1>&2 102 fi 103 done''') 104 105 Hardware.print_debug_diagnostics(self) 106 107 # expects a float between 0 and 100 representing where along the list of freqs to choose a value. 108 def setDesiredClock(self, c): 109 self.desiredClock = c / 100 110 111 def lock_top_three_cores(self): 112 # Lock the clocks of the fastest three cores and disable others. 113 # Assumes root privlidges 114 core_count = int(self._adb.check('cat /proc/cpuinfo | grep processor | wc -l')) 115 max_speeds = [] 116 for i in range(core_count): 117 khz = int(self._adb.check('cat /sys/devices/system/cpu/cpu%i/cpufreq/cpuinfo_max_freq' % i)) 118 max_speeds.append((khz, i)) # the tuple's first position and it will be the sort key 119 cores_in_desc_order_of_max_speed = [a[1] for a in sorted(max_speeds, reverse=True)] 120 top_cores = cores_in_desc_order_of_max_speed[:3] 121 disable_cores = cores_in_desc_order_of_max_speed[3:] 122 if disable_cores: 123 self._adb.shell('\n'.join([('echo 0 > /sys/devices/system/cpu/cpu%i/online' % i) for i in disable_cores])) 124 # since thermal-engine will be disabled, don't pick the max freq to lock these at, 125 # pick something lower, so it doesn't get too hot (it'd reboot) 126 # get a list of available scaling frequencies and pick one 2/3 of the way up. 127 for i in top_cores: 128 freqs = self._adb.check('cat /sys/devices/system/cpu/cpu%i/cpufreq/scaling_available_frequencies' % i).split() 129 speed = freqs[int((len(freqs)-1) * self.desiredClock)] 130 self._adb.shell('''echo 1 > /sys/devices/system/cpu/cpu{id}/online 131 echo userspace > /sys/devices/system/cpu/cpu{id}/cpufreq/scaling_governor 132 echo {speed} > /sys/devices/system/cpu/cpu{id}/cpufreq/scaling_max_freq 133 echo {speed} > /sys/devices/system/cpu/cpu{id}/cpufreq/scaling_min_freq 134 echo {speed} > /sys/devices/system/cpu/cpu{id}/cpufreq/scaling_setspeed'''.format(id=i, speed=speed)) 135 136 def lock_adreno_gpu(self): 137 # Use presence of /sys/class/kgsl to indicate Adreno GPU 138 exists = self._adb.check('test -d /sys/class/kgsl && echo y') 139 if (exists.strip() != 'y'): 140 print('Not attempting Adreno GPU clock locking steps') 141 return 142 143 # variance reducing changes 144 self._adb.shell(''' 145 echo 0 > /sys/class/kgsl/kgsl-3d0/bus_split 146 echo 1 > /sys/class/kgsl/kgsl-3d0/force_clk_on 147 echo 10000 > /sys/class/kgsl/kgsl-3d0/idle_timer''') 148 149 freqs = self._adb.check('cat /sys/class/kgsl/kgsl-3d0/devfreq/available_frequencies').split() 150 speed = freqs[int((len(freqs)-1) * self.desiredClock)] 151 152 # Set GPU to performance mode and lock clock 153 self._adb.shell(''' 154 echo performance > /sys/class/kgsl/kgsl-3d0/devfreq/governor 155 echo {speed} > /sys/class/kgsl/kgsl-3d0/devfreq/max_freq 156 echo {speed} > /sys/class/kgsl/kgsl-3d0/devfreq/min_freq'''.format(speed=speed)) 157 158 # Set GPU power level 159 self._adb.shell(''' 160 echo 1 > /sys/class/kgsl/kgsl-3d0/max_pwrlevel 161 echo 1 > /sys/class/kgsl/kgsl-3d0/min_pwrlevel''') 162