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#!/usr/bin/python
import struct
import os
import glob
import argparse
pstates = range(0xC0010064, 0xC001006C)
def writemsr(msr, val, cpu = -1):
try:
if cpu == -1:
for c in glob.glob('/dev/cpu/[0-9]*/msr'):
f = os.open(c, os.O_WRONLY)
os.lseek(f, msr, os.SEEK_SET)
os.write(f, struct.pack('Q', val))
os.close(f)
else:
f = os.open('/dev/cpu/%d/msr' % (cpu), os.O_WRONLY)
os.lseek(f, msr, os.SEEK_SET)
os.write(f, struct.pack('Q', val))
os.close(f)
except:
raise OSError("msr module not loaded (run modprobe msr)")
def readmsr(msr, cpu = 0):
try:
f = os.open('/dev/cpu/%d/msr' % cpu, os.O_RDONLY)
os.lseek(f, msr, os.SEEK_SET)
val = struct.unpack('Q', os.read(f, 8))[0]
os.close(f)
return val
except:
raise OSError("msr module not loaded (run modprobe msr)")
def pstate2str(val):
if val & (1 << 63):
fid = val & 0xff
did = (val & 0x3f00) >> 8
vid = (val & 0x3f0000) >> 14
ratio = 25*fid/(12.5 * did)
vcore = 1.55 - 0.00625 * vid
return "Enabled - FID = %X - DID = %X - VID = %X - Ratio = %.2f - vCore = %.5f" % (fid, did, vid, ratio, vcore)
else:
return "Disabled"
def setbits(val, base, length, new):
return (val ^ (val & ((2 ** length - 1) << base))) + (new << base)
def setfid(val, new):
return setbits(val, 0, 8, new)
def setdid(val, new):
return setbits(val, 8, 6, new)
def setvid(val, new):
return setbits(val, 14, 8, new)
def hex(x):
return int(x, 16)
parser = argparse.ArgumentParser(description='Sets P-States for Ryzen processors')
parser.add_argument('-l', '--list', action='store_true', help='List all P-States')
parser.add_argument('-p', '--pstate', default=-1, type=int, choices=range(8), help='P-State to set')
parser.add_argument('--enable', action='store_true', help='Enable P-State')
parser.add_argument('--disable', action='store_true', help='Disable P-State')
parser.add_argument('-f', '--fid', default=-1, type=hex, help='FID to set (in hex)')
parser.add_argument('-d', '--did', default=-1, type=hex, help='DID to set (in hex)')
parser.add_argument('-v', '--vid', default=-1, type=hex, help='VID to set (in hex)')
args = parser.parse_args()
if args.list:
for p in range(len(pstates)):
print('P' + str(p) + " - " + pstate2str(readmsr(pstates[p])))
if args.pstate >= 0:
new = old = readmsr(pstates[args.pstate])
print('Current P' + str(args.pstate) + ': ' + pstate2str(old))
if args.enable:
new = setbits(new, 63, 1, 1)
print('Enabling state')
if args.disable:
new = setbits(new, 63, 1, 0)
print('Disabling state')
if args.fid >= 0:
new = setfid(new, args.fid)
print('Setting FID to %X' % args.fid)
if args.did >= 0:
new = setdid(new, args.did)
print('Setting DID to %X' % args.did)
if args.vid >= 0:
new = setvid(new, args.vid)
print('Setting VID to %X' % args.vid)
if new != old:
if not (readmsr(0xC0010015) & (1 << 21)):
print('Locking TSC frequency')
for c in range(len(glob.glob('/dev/cpu/[0-9]*/msr'))):
writemsr(0xC0010015, readmsr(0xC0010015, c) | (1 << 21), c)
print('New P' + str(args.pstate) + ': ' + pstate2str(new))
writemsr(pstates[args.pstate], new)
if not args.list and args.pstate == -1:
parser.print_help()