This patch series implements various improvements for the k10temp driver.
Patch 1/6 introduces the use of bit operations.
Patch 2/6 converts the driver to use the devm_hwmon_device_register_with_info
API. This not only simplifies the code and reduces its size, it also
makes the code easier to maintain and enhance.
Patch 3/6 adds support for reporting Core Complex Die (CCD) temperatures
on Zen2 (Ryzen and Threadripper) CPUs (note that reporting is incomplete
for Threadripper CPUs - it is known that additional temperature sensors
exist, but the register locations are unknown).
Patch 4/6 adds support for reporting core and SoC current and voltage
information on Ryzen CPUs (note: voltage and current measurements for
Threadripper and EPYC CPUs are known to exist, but register locations
are unknown, and values are therefore not reported at this time).
Patch 5/6 removes the maximum temperature from Tdie for Ryzen CPUs.
It is inaccurate, misleading, and it just doesn't make sense to report
wrong information.
Patch 6/6 adds debugfs files to provide raw thermal and SVI register
dumps. This may help in the future to identify additional sensors and/or
to fix problems.
With all patches in place, output on Ryzen 3900X CPUs looks as follows
(with the system under load).
k10temp-pci-00c3
Adapter: PCI adapter
Vcore: +1.39 V
Vsoc: +1.18 V
Tdie: +79.9°C
Tctl: +79.9°C
Tccd1: +61.8°C
Tccd2: +76.5°C
Icore: +46.00 A
Isoc: +12.00 A
The voltage and current information is limited to Ryzen CPUs. Voltage
and current reporting on Threadripper and EPYC CPUs is different, and the
reported information is either incomplete or wrong. Exclude it for the time
being; it can always be added if/when more information becomes available.
Tested with the following Ryzen CPUs:
1300X A user with this CPU in the system reported somewhat unexpected
values for Vcore; it isn't entirely if at all clear why that is
the case. Overall this does not warrant holding up the series.
1600
1800X
2200G
2400G
2700
2700X
2950X
3600X
3800X
3900X
3950X
3970X
EPYC 7302
EPYC 7742
Many thanks to everyone who helped to test this series.
---
v4: Normalize current calculations do show 1A / LSB for core current and
0.25A / LSB for SoC current. The reported current values are board
specific and need to be scaled using the configuration file.
Clarified that the maximum temperature of 70 degrees C (which is no
longer displayed) was associated to Tctl and not to Tdie.
Added debugfs support.
v3: Added more Tested-by: tags
Added detection for 3970X, and report Tccd1 for this CPU.
v2: Added Tested-by: tags as received.
Don't display voltage and current information for Threadripper and EPYC.
Stop displaying the fixed (and wrong) maximum temperature of 70 degrees C
for Tdie on model 17h/18h CPUs.
