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Date: Mon, 2 Aug 2021 11:39:36 +0000
From: "Winiarska, Iwona" <iwona.winiarska@...el.com>
To: "linux@...ck-us.net" <linux@...ck-us.net>,
"zweiss@...inix.com" <zweiss@...inix.com>
CC: "corbet@....net" <corbet@....net>,
"jae.hyun.yoo@...ux.intel.com" <jae.hyun.yoo@...ux.intel.com>,
"Lutomirski, Andy" <luto@...nel.org>,
"linux-hwmon@...r.kernel.org" <linux-hwmon@...r.kernel.org>,
"Luck, Tony" <tony.luck@...el.com>,
"andrew@...id.au" <andrew@...id.au>,
"mchehab@...nel.org" <mchehab@...nel.org>,
"jdelvare@...e.com" <jdelvare@...e.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
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"tglx@...utronix.de" <tglx@...utronix.de>,
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"openbmc@...ts.ozlabs.org" <openbmc@...ts.ozlabs.org>,
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"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"pierre-louis.bossart@...ux.intel.com"
<pierre-louis.bossart@...ux.intel.com>,
"andriy.shevchenko@...ux.intel.com"
<andriy.shevchenko@...ux.intel.com>,
"x86@...nel.org" <x86@...nel.org>,
"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 13/14] docs: hwmon: Document PECI drivers
On Tue, 2021-07-27 at 17:49 -0700, Guenter Roeck wrote:
> On 7/27/21 3:58 PM, Zev Weiss wrote:
> > On Mon, Jul 12, 2021 at 05:04:46PM CDT, Iwona Winiarska wrote:
> > > From: Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com>
> > >
> > > Add documentation for peci-cputemp driver that provides DTS thermal
> > > readings for CPU packages and CPU cores and peci-dimmtemp driver that
> > > provides DTS thermal readings for DIMMs.
> > >
> > > Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com>
> > > Co-developed-by: Iwona Winiarska <iwona.winiarska@...el.com>
> > > Signed-off-by: Iwona Winiarska <iwona.winiarska@...el.com>
> > > Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
> > > ---
> > > Documentation/hwmon/index.rst | 2 +
> > > Documentation/hwmon/peci-cputemp.rst | 93 +++++++++++++++++++++++++++
> > > Documentation/hwmon/peci-dimmtemp.rst | 58 +++++++++++++++++
> > > MAINTAINERS | 2 +
> > > 4 files changed, 155 insertions(+)
> > > create mode 100644 Documentation/hwmon/peci-cputemp.rst
> > > create mode 100644 Documentation/hwmon/peci-dimmtemp.rst
> > >
> > > diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
> > > index bc01601ea81a..cc76b5b3f791 100644
> > > --- a/Documentation/hwmon/index.rst
> > > +++ b/Documentation/hwmon/index.rst
> > > @@ -154,6 +154,8 @@ Hardware Monitoring Kernel Drivers
> > > pcf8591
> > > pim4328
> > > pm6764tr
> > > + peci-cputemp
> > > + peci-dimmtemp
> > > pmbus
> > > powr1220
> > > pxe1610
> > > diff --git a/Documentation/hwmon/peci-cputemp.rst
> > > b/Documentation/hwmon/peci-cputemp.rst
> > > new file mode 100644
> > > index 000000000000..d3a218ba810a
> > > --- /dev/null
> > > +++ b/Documentation/hwmon/peci-cputemp.rst
> > > @@ -0,0 +1,93 @@
> > > +.. SPDX-License-Identifier: GPL-2.0-only
> > > +
> > > +Kernel driver peci-cputemp
> > > +==========================
> > > +
> > > +Supported chips:
> > > + One of Intel server CPUs listed below which is connected to a PECI
> > > bus.
> > > + * Intel Xeon E5/E7 v3 server processors
> > > + Intel Xeon E5-14xx v3 family
> > > + Intel Xeon E5-24xx v3 family
> > > + Intel Xeon E5-16xx v3 family
> > > + Intel Xeon E5-26xx v3 family
> > > + Intel Xeon E5-46xx v3 family
> > > + Intel Xeon E7-48xx v3 family
> > > + Intel Xeon E7-88xx v3 family
> > > + * Intel Xeon E5/E7 v4 server processors
> > > + Intel Xeon E5-16xx v4 family
> > > + Intel Xeon E5-26xx v4 family
> > > + Intel Xeon E5-46xx v4 family
> > > + Intel Xeon E7-48xx v4 family
> > > + Intel Xeon E7-88xx v4 family
> > > + * Intel Xeon Scalable server processors
> > > + Intel Xeon D family
> > > + Intel Xeon Bronze family
> > > + Intel Xeon Silver family
> > > + Intel Xeon Gold family
> > > + Intel Xeon Platinum family
> > > +
> > > + Datasheet: Available from http://www.intel.com/design/literature.htm
> > > +
> > > +Author: Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com>
> > > +
> > > +Description
> > > +-----------
> > > +
> > > +This driver implements a generic PECI hwmon feature which provides Digital
> > > +Thermal Sensor (DTS) thermal readings of the CPU package and CPU cores that
> > > are
> > > +accessible via the processor PECI interface.
> > > +
> > > +All temperature values are given in millidegree Celsius and will be
> > > measurable
> > > +only when the target CPU is powered on.
> > > +
> > > +Sysfs interface
> > > +-------------------
> > > +
> > > +=======================
> > > =======================================================
> > > +temp1_label "Die"
> > > +temp1_input Provides current die temperature of the CPU package.
> > > +temp1_max Provides thermal control temperature of the CPU
> > > package
> > > + which is also known as Tcontrol.
> > > +temp1_crit Provides shutdown temperature of the CPU package
> > > which
> > > + is also known as the maximum processor junction
> > > + temperature, Tjmax or Tprochot.
> > > +temp1_crit_hyst Provides the hysteresis value from Tcontrol
> > > to Tjmax of
> > > + the CPU package.
> > > +
> > > +temp2_label "DTS"
> > > +temp2_input Provides current DTS temperature of the CPU package.
> >
> > Would this be a good place to note the slightly counter-intuitive nature
> > of DTS readings? i.e. add something along the lines of "The DTS sensor
> > produces a delta relative to Tjmax, so negative values are normal and
> > values approaching zero are hot." (In my experience people who aren't
> > already familiar with it tend to think something's wrong when a CPU
> > temperature reading shows -50C.)
> >
>
> All attributes shall follow the ABI, and the driver must translate reported
> values to degrees C. If those sensors do not follow the ABI and report something
> else, I won't accept the driver.
>
> Guenter
Sure, I believe all attributes already follow the ABI and the reported values
are in millidegree Celsius.
Thanks
-Iwona
>
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