linux-kernel - Re: [PATCH v4 0/6] hwmon: k10temp driver improvements

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Message-ID: <20200122193739.GA22685@roeck-us.net>
Date:   Wed, 22 Jan 2020 11:37:39 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Sebastian Reichel <sebastian.reichel@...labora.com>
Cc:     linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org,
        Clemens Ladisch <clemens@...isch.de>,
        Jean Delvare <jdelvare@...e.com>,
        Brad Campbell <lists2009@...rfbargle.com>,
        Ondrej Čerman <ocerman@...1.eu>,
        Bernhard Gebetsberger <bernhard.gebetsberger@....at>,
        Holger Kiehl <Holger.Kiehl@....de>,
        Michael Larabel <michael@...ronix.com>,
        Jonathan McDowell <noodles@...th.li>,
        Ken Moffat <zarniwhoop73@...glemail.com>,
        Darren Salt <devspam@...eofthesa.me.uk>
Subject: Re: [PATCH v4 0/6] hwmon: k10temp driver improvements

On Wed, Jan 22, 2020 at 08:05:08PM +0100, Sebastian Reichel wrote:
> Hi,
> 
> The series is
> 
> Tested-by: Sebastian Reichel <sebastian.reichel@...labora.com>
> 
Thanks again!

Guenter

> on 3800X.
> 
> idle:
> 
> k10temp-pci-00c3
> Adapter: PCI adapter
> Vcore:       919.00 mV
> Vsoc:          1.01 V
> Tdie:         +41.1°C
> Tctl:         +41.1°C
> Tccd1:        +39.8°C
> Icore:         0.00 A
> Isoc:          4.50 A
> 
> with load:
> 
> k10temp-pci-00c3
> Adapter: PCI adapter
> Vcore:         1.29 V
> Vsoc:          1.01 V
> Tdie:         +80.4°C
> Tctl:         +80.4°C
> Tccd1:        +78.5°C
> Icore:        61.00 A
> Isoc:          6.50 A
> 
> debugfs output is also register dumps are also working.
> 
> -- Sebastian
> 
> On Wed, Jan 22, 2020 at 08:07:54AM -0800, Guenter Roeck wrote:
> > 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.