17ebd8b66SMauro Carvalho ChehabKernel driver k8temp 27ebd8b66SMauro Carvalho Chehab==================== 37ebd8b66SMauro Carvalho Chehab 47ebd8b66SMauro Carvalho ChehabSupported chips: 57ebd8b66SMauro Carvalho Chehab 67ebd8b66SMauro Carvalho Chehab * AMD Athlon64/FX or Opteron CPUs 77ebd8b66SMauro Carvalho Chehab 87ebd8b66SMauro Carvalho Chehab Prefix: 'k8temp' 97ebd8b66SMauro Carvalho Chehab 107ebd8b66SMauro Carvalho Chehab Addresses scanned: PCI space 117ebd8b66SMauro Carvalho Chehab 12f4753560SAlexander A. Klimov Datasheet: https://www.amd.com/system/files/TechDocs/32559.pdf 137ebd8b66SMauro Carvalho Chehab 147ebd8b66SMauro Carvalho ChehabAuthor: Rudolf Marek 157ebd8b66SMauro Carvalho Chehab 167ebd8b66SMauro Carvalho ChehabContact: Rudolf Marek <r.marek@assembler.cz> 177ebd8b66SMauro Carvalho Chehab 187ebd8b66SMauro Carvalho ChehabDescription 197ebd8b66SMauro Carvalho Chehab----------- 207ebd8b66SMauro Carvalho Chehab 217ebd8b66SMauro Carvalho ChehabThis driver permits reading temperature sensor(s) embedded inside AMD K8 227ebd8b66SMauro Carvalho Chehabfamily CPUs (Athlon64/FX, Opteron). Official documentation says that it works 237ebd8b66SMauro Carvalho Chehabfrom revision F of K8 core, but in fact it seems to be implemented for all 247ebd8b66SMauro Carvalho Chehabrevisions of K8 except the first two revisions (SH-B0 and SH-B3). 257ebd8b66SMauro Carvalho Chehab 267ebd8b66SMauro Carvalho ChehabPlease note that you will need at least lm-sensors 2.10.1 for proper userspace 277ebd8b66SMauro Carvalho Chehabsupport. 287ebd8b66SMauro Carvalho Chehab 297ebd8b66SMauro Carvalho ChehabThere can be up to four temperature sensors inside single CPU. The driver 307ebd8b66SMauro Carvalho Chehabwill auto-detect the sensors and will display only temperatures from 317ebd8b66SMauro Carvalho Chehabimplemented sensors. 327ebd8b66SMauro Carvalho Chehab 337ebd8b66SMauro Carvalho ChehabMapping of /sys files is as follows: 347ebd8b66SMauro Carvalho Chehab 357ebd8b66SMauro Carvalho Chehab============= =================================== 367ebd8b66SMauro Carvalho Chehabtemp1_input temperature of Core 0 and "place" 0 377ebd8b66SMauro Carvalho Chehabtemp2_input temperature of Core 0 and "place" 1 387ebd8b66SMauro Carvalho Chehabtemp3_input temperature of Core 1 and "place" 0 397ebd8b66SMauro Carvalho Chehabtemp4_input temperature of Core 1 and "place" 1 407ebd8b66SMauro Carvalho Chehab============= =================================== 417ebd8b66SMauro Carvalho Chehab 427ebd8b66SMauro Carvalho ChehabTemperatures are measured in degrees Celsius and measurement resolution is 437ebd8b66SMauro Carvalho Chehab1 degree C. It is expected that future CPU will have better resolution. The 447ebd8b66SMauro Carvalho Chehabtemperature is updated once a second. Valid temperatures are from -49 to 457ebd8b66SMauro Carvalho Chehab206 degrees C. 467ebd8b66SMauro Carvalho Chehab 477ebd8b66SMauro Carvalho ChehabTemperature known as TCaseMax was specified for processors up to revision E. 487ebd8b66SMauro Carvalho ChehabThis temperature is defined as temperature between heat-spreader and CPU 497ebd8b66SMauro Carvalho Chehabcase, so the internal CPU temperature supplied by this driver can be higher. 507ebd8b66SMauro Carvalho ChehabThere is no easy way how to measure the temperature which will correlate 517ebd8b66SMauro Carvalho Chehabwith TCaseMax temperature. 527ebd8b66SMauro Carvalho Chehab 537ebd8b66SMauro Carvalho ChehabFor newer revisions of CPU (rev F, socket AM2) there is a mathematically 547ebd8b66SMauro Carvalho Chehabcomputed temperature called TControl, which must be lower than TControlMax. 557ebd8b66SMauro Carvalho Chehab 567ebd8b66SMauro Carvalho ChehabThe relationship is following: 577ebd8b66SMauro Carvalho Chehab 587ebd8b66SMauro Carvalho Chehab temp1_input - TjOffset*2 < TControlMax, 597ebd8b66SMauro Carvalho Chehab 607ebd8b66SMauro Carvalho ChehabTjOffset is not yet exported by the driver, TControlMax is usually 617ebd8b66SMauro Carvalho Chehab70 degrees C. The rule of the thumb -> CPU temperature should not cross 627ebd8b66SMauro Carvalho Chehab60 degrees C too much. 63