linux-kernel - Re: [PATCH v2 0/5] hwmon: k10temp driver improvements

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Message-ID: <7345a801-6e9d-b85f-1a8a-72ee89cc0330@roeck-us.net>
Date:   Sat, 18 Jan 2020 16:48:56 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Ken Moffat <zarniwhoop73@...glemail.com>
Cc:     linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org,
        Clemens Ladisch <clemens@...isch.de>,
        Jean Delvare <jdelvare@...e.com>,
        Darren Salt <devspam@...eofthesa.me.uk>,
        Bernhard Gebetsberger <bernhard.gebetsberger@....at>,
        Ondrej Čerman <ocerman@...1.eu>,
        Holger Kiehl <Holger.Kiehl@....de>,
        Sebastian Reichel <sebastian.reichel@...labora.com>,
        Brad Campbell <lists2009@...rfbargle.com>
Subject: Re: [PATCH v2 0/5] hwmon: k10temp driver improvements

On 1/18/20 4:33 PM, Ken Moffat wrote:
> On Sat, 18 Jan 2020 at 17:26, Guenter Roeck <linux@...ck-us.net> wrote:
>>
>> This patch series implements various improvements for the k10temp driver.
>>
>> Patch 1/5 introduces the use of bit operations.
>>
>> Patch 2/5 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 3/5 adds support for reporting Core Complex Die (CCD) temperatures
>> on Ryzen 3 (Zen2) CPUs.
>>
>> Patch 4/5 adds support for reporting core and SoC current and voltage
>> information on Ryzen CPUs.
>>
>> Patch 5/5 removes the maximum temperature from Tdie for Ryzen CPUs.
>> It is inaccurate, misleading, and it just doesn't make sense to report
>> wrong information.
>>
>> 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:        +1.36 V
>> Vsoc:         +1.18 V
>> Tdie:         +86.8°C
>> Tctl:         +86.8°C
>> Tccd1:        +80.0°C
>> Tccd2:        +81.8°C
>> Icore:       +44.14 A
>> Isoc:        +13.83 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.
> 
> As the owner of that machine, very much agreed.
>  >>      1600
>>      1800X
>>      2200G
>>      2400G
>>      3800X
>>      3900X
>>      3950X
>>
> 
> I also had sensible results for v1 on 2500U and 3400G
> 
Sorry, I somehow missed that.

>> 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.
> 
> For v2 on my 2500U, system idle and then under load -
> 
> --- k10temp-idle 2020-01-19 00:16:18.812002121 +0000
> +++ k10temp-load 2020-01-19 00:22:05.595470877 +0000
> @@ -1,15 +1,15 @@
>   k10temp-pci-00c3
>   Adapter: PCI adapter
> -Vcore:        +0.98 V
> +Vcore:        +1.15 V
>   Vsoc:         +0.93 V
> -Tdie:         +38.2°C
> -Tctl:         +38.2°C
> -Icore:       +10.39 A
> -Isoc:         +6.49 A
> +Tdie:         +76.2°C
> +Tctl:         +76.2°C
> +Icore:       +51.96 A
> +Isoc:         +7.58 A
> 
>   amdgpu-pci-0300
>   Adapter: PCI adapter
>   vddgfx:           N/A
>   vddnb:            N/A
> -edge:         +38.0°C  (crit = +80.0°C, hyst =  +0.0°C)
> +edge:         +76.0°C  (crit = +80.0°C, hyst =  +0.0°C)
> 
> I'll ony test v2 on the 3400G if you think the results would add something.
> 

Thanks a lot for the additional testing! I don't think we need another
test on 3400G; after all, the actual measurement code didn't change.

Everyone: I'll be happy to add Tested-by: tags with your name and e-mail
address to the series, but you'll have to send it to me. I appreciate
all your testing and would like to acknowledge it, but I can not add
Tested-by: tags (or any other tags, for that matter) on my own.

Thanks,
Guenter