Merge branch 'next' of git://git.infradead.org/users/vkoul/slave-dma
[sfrench/cifs-2.6.git] / Documentation / hwmon / coretemp
1 Kernel driver coretemp
2 ======================
3
4 Supported chips:
5   * All Intel Core family
6     Prefix: 'coretemp'
7     CPUID: family 0x6, models 0xe (Pentium M DC), 0xf (Core 2 DC 65nm),
8                               0x16 (Core 2 SC 65nm), 0x17 (Penryn 45nm),
9                               0x1a (Nehalem), 0x1c (Atom), 0x1e (Lynnfield),
10                               0x26 (Tunnel Creek Atom), 0x27 (Medfield Atom),
11                               0x36 (Cedar Trail Atom)
12     Datasheet: Intel 64 and IA-32 Architectures Software Developer's Manual
13                Volume 3A: System Programming Guide
14                http://softwarecommunity.intel.com/Wiki/Mobility/720.htm
15
16 Author: Rudolf Marek
17
18 Description
19 -----------
20 This driver permits reading the DTS (Digital Temperature Sensor) embedded
21 inside Intel CPUs. This driver can read both the per-core and per-package
22 temperature using the appropriate sensors. The per-package sensor is new;
23 as of now, it is present only in the SandyBridge platform. The driver will
24 show the temperature of all cores inside a package under a single device
25 directory inside hwmon.
26
27 Temperature is measured in degrees Celsius and measurement resolution is
28 1 degree C. Valid temperatures are from 0 to TjMax degrees C, because
29 the actual value of temperature register is in fact a delta from TjMax.
30
31 Temperature known as TjMax is the maximum junction temperature of processor,
32 which depends on the CPU model. See table below. At this temperature, protection
33 mechanism will perform actions to forcibly cool down the processor. Alarm
34 may be raised, if the temperature grows enough (more than TjMax) to trigger
35 the Out-Of-Spec bit. Following table summarizes the exported sysfs files:
36
37 All Sysfs entries are named with their core_id (represented here by 'X').
38 tempX_input      - Core temperature (in millidegrees Celsius).
39 tempX_max        - All cooling devices should be turned on (on Core2).
40 tempX_crit       - Maximum junction temperature (in millidegrees Celsius).
41 tempX_crit_alarm - Set when Out-of-spec bit is set, never clears.
42                    Correct CPU operation is no longer guaranteed.
43 tempX_label      - Contains string "Core X", where X is processor
44                    number. For Package temp, this will be "Physical id Y",
45                    where Y is the package number.
46
47 On CPU models which support it, TjMax is read from a model-specific register.
48 On other models, it is set to an arbitrary value based on weak heuristics.
49 If these heuristics don't work for you, you can pass the correct TjMax value
50 as a module parameter (tjmax).
51
52 Appendix A. Known TjMax lists (TBD):
53 Some information comes from ark.intel.com
54
55 Process         Processor                                       TjMax(C)
56
57 22nm            Core i5/i7 Processors
58                 i7 3920XM, 3820QM, 3720QM, 3667U, 3520M         105
59                 i5 3427U, 3360M/3320M                           105
60                 i7 3770/3770K                                   105
61                 i5 3570/3570K, 3550, 3470/3450                  105
62                 i7 3770S                                        103
63                 i5 3570S/3550S, 3475S/3470S/3450S               103
64                 i7 3770T                                        94
65                 i5 3570T                                        94
66                 i5 3470T                                        91
67
68 32nm            Core i3/i5/i7 Processors
69                 i7 2600                                         98
70                 i7 660UM/640/620, 640LM/620, 620M, 610E         105
71                 i5 540UM/520/430, 540M/520/450/430              105
72                 i3 330E, 370M/350/330                           90 rPGA, 105 BGA
73                 i3 330UM                                        105
74
75 32nm            Core i7 Extreme Processors
76                 980X                                            100
77
78 32nm            Celeron Processors
79                 U3400                                           105
80                 P4505/P4500                                     90
81
82 32nm            Atom Processors
83                 S1260/1220                                      95
84                 S1240                                           102
85                 Z2460                                           90
86                 Z2760                                           90
87                 D2700/2550/2500                                 100
88                 N2850/2800/2650/2600                            100
89
90 45nm            Xeon Processors 5400 Quad-Core
91                 X5492, X5482, X5472, X5470, X5460, X5450        85
92                 E5472, E5462, E5450/40/30/20/10/05              85
93                 L5408                                           95
94                 L5430, L5420, L5410                             70
95
96 45nm            Xeon Processors 5200 Dual-Core
97                 X5282, X5272, X5270, X5260                      90
98                 E5240                                           90
99                 E5205, E5220                                    70, 90
100                 L5240                                           70
101                 L5238, L5215                                    95
102
103 45nm            Atom Processors
104                 D525/510/425/410                                100
105                 K525/510/425/410                                100
106                 Z670/650                                        90
107                 Z560/550/540/530P/530/520PT/520/515/510PT/510P  90
108                 Z510/500                                        90
109                 N570/550                                        100
110                 N475/470/455/450                                100
111                 N280/270                                        90
112                 330/230                                         125
113                 E680/660/640/620                                90
114                 E680T/660T/640T/620T                            110
115                 E665C/645C                                      90
116                 E665CT/645CT                                    110
117                 CE4170/4150/4110                                110
118                 CE4200 series                                   unknown
119                 CE5300 series                                   unknown
120
121 45nm            Core2 Processors
122                 Solo ULV SU3500/3300                            100
123                 T9900/9800/9600/9550/9500/9400/9300/8300/8100   105
124                 T6670/6500/6400                                 105
125                 T6600                                           90
126                 SU9600/9400/9300                                105
127                 SP9600/9400                                     105
128                 SL9600/9400/9380/9300                           105
129                 P9700/9600/9500/8800/8700/8600/8400/7570        105
130                 P7550/7450                                      90
131
132 45nm            Core2 Quad Processors
133                 Q9100/9000                                      100
134
135 45nm            Core2 Extreme Processors
136                 X9100/9000                                      105
137                 QX9300                                          100
138
139 45nm            Core i3/i5/i7 Processors
140                 i7 940XM/920                                    100
141                 i7 840QM/820/740/720                            100
142
143 45nm            Celeron Processors
144                 SU2300                                          100
145                 900                                             105
146
147 65nm            Core2 Duo Processors
148                 Solo U2200, U2100                               100
149                 U7700/7600/7500                                 100
150                 T7800/7700/7600/7500/7400/7300/7250/7200/7100   100
151                 T5870/5670/5600/5550/5500/5470/5450/5300/5270   100
152                 T5250                                           100
153                 T5800/5750/5200                                 85
154                 L7700/7500/7400/7300/7200                       100
155
156 65nm            Core2 Extreme Processors
157                 X7900/7800                                      100
158
159 65nm            Core Duo Processors
160                 U2500/2400                                      100
161                 T2700/2600/2450/2400/2350/2300E/2300/2250/2050  100
162                 L2500/2400/2300                                 100
163
164 65nm            Core Solo Processors
165                 U1500/1400/1300                                 100
166                 T1400/1350/1300/1250                            100
167
168 65nm            Xeon Processors 5000 Quad-Core
169                 X5000                                           90-95
170                 E5000                                           80
171                 L5000                                           70
172                 L5318                                           95
173
174 65nm            Xeon Processors 5000 Dual-Core
175                 5080, 5063, 5060, 5050, 5030                    80-90
176                 5160, 5150, 5148, 5140, 5130, 5120, 5110        80
177                 L5138                                           100
178
179 65nm            Celeron Processors
180                 T1700/1600                                      100
181                 560/550/540/530                                 100