102 lines
3.1 KiB
Python
Executable File
102 lines
3.1 KiB
Python
Executable File
#!/usr/bin/env python2
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import ConfigParser
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import glob
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import os
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import struct
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from collections import defaultdict
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from periphery import MMIO
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from time import sleep
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SYSFS_POWER_PATH = '/sys/class/power_supply/AC/online'
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CONFIG_PATH = '/etc/lenovo_fix.conf'
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def writemsr(msr, val):
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n = glob.glob('/dev/cpu/[0-9]*/msr')
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for c in n:
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f = os.open(c, os.O_WRONLY)
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os.lseek(f, msr, os.SEEK_SET)
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os.write(f, struct.pack('Q', val))
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os.close(f)
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if not n:
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raise OSError("msr module not loaded (run modprobe msr)")
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def is_on_battery():
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with open(SYSFS_POWER_PATH) as f:
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return not bool(int(f.read()))
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def calc_time_window_vars(t):
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for Y in xrange(2**5):
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for Z in xrange(2**2):
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if t <= (2**Y) * (1. + Z / 4.) * 0.000977:
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return (Y, Z)
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raise Exception('Unable to find a good combination!')
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def load_config():
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config = ConfigParser.ConfigParser()
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config.read(CONFIG_PATH)
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for power_source in ('AC', 'BATTERY'):
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assert 0 < config.getfloat(power_source, 'Update_Rate_s')
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assert 0 < config.getfloat(power_source, 'PL1_Tdp_W')
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assert 0 < config.getfloat(power_source, 'PL1_Duration_s')
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assert 0 < config.getfloat(power_source, 'PL2_Tdp_W')
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assert 0 < config.getfloat(power_source, 'PL2_Duration_S')
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assert 40 < config.getfloat(power_source, 'Trip_Temp_C') < 98
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return config
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def calc_reg_values(config):
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regs = defaultdict(dict)
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for power_source in ('AC', 'BATTERY'):
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# the critical temperature for this CPU is 100 C
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trip_offset = int(round(100 - config.getfloat(power_source, 'Trip_Temp_C')))
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regs[power_source]['MSR_TEMPERATURE_TARGET'] = trip_offset << 24
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# 0.125 is the power unit of this CPU
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PL1 = int(round(config.getfloat(power_source, 'PL1_Tdp_W') / 0.125))
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Y, Z = calc_time_window_vars(config.getfloat(power_source, 'PL1_Duration_s'))
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TW1 = Y | (Z << 5)
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PL2 = int(round(config.getfloat(power_source, 'PL2_Tdp_W') / 0.125))
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Y, Z = calc_time_window_vars(config.getfloat(power_source, 'PL2_Duration_s'))
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TW2 = Y | (Z << 5)
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regs[power_source]['MSR_PKG_POWER_LIMIT'] = PL1 | (1 << 15) | (TW1 << 17) | (PL2 << 32) | (1 << 47) | (
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TW2 << 49)
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return regs
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def main():
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config = load_config()
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regs = calc_reg_values(config)
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if not config.getboolean('GENERAL', 'Enabled'):
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return
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mchbar_mmio = MMIO(0xfed159a0, 8)
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while True:
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power_source = 'BATTERY' if is_on_battery() else 'AC'
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# set temperature trip point
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writemsr(0x1a2, regs[power_source]['MSR_TEMPERATURE_TARGET'])
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# set PL1/2 on MSR
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writemsr(0x610, regs[power_source]['MSR_PKG_POWER_LIMIT'])
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# set MCHBAR register to the same PL1/2 values
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mchbar_mmio.write32(0, regs[power_source]['MSR_PKG_POWER_LIMIT'] & 0xffffffff)
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mchbar_mmio.write32(4, regs[power_source]['MSR_PKG_POWER_LIMIT'] >> 32)
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sleep(config.getfloat(power_source, 'Update_Rate_s'))
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if __name__ == '__main__':
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main()
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