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From: "Winiarska, Iwona" <iwona.winiarska@intel.com>
To: "linux@roeck-us.net" <linux@roeck-us.net>,
	"zweiss@equinix.com" <zweiss@equinix.com>
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Subject: Re: [PATCH 13/14] docs: hwmon: Document PECI drivers
Date: Mon, 2 Aug 2021 11:39:36 +0000	[thread overview]
Message-ID: <ad6b0ccbed7ad3e4a8b8519571f5c23cca22a12d.camel@intel.com> (raw)
In-Reply-To: <0521a076-9772-532f-2eab-8870464ca211@roeck-us.net>

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@linux.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@linux.intel.com>
> > > Co-developed-by: Iwona Winiarska <iwona.winiarska@intel.com>
> > > Signed-off-by: Iwona Winiarska <iwona.winiarska@intel.com>
> > > Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.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@linux.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
> 


  reply	other threads:[~2021-08-02 11:41 UTC|newest]

Thread overview: 72+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-12 22:04 [PATCH 00/14] Introduce PECI subsystem Iwona Winiarska
2021-07-12 22:04 ` [PATCH 01/14] x86/cpu: Move intel-family to arch-independent headers Iwona Winiarska
2021-07-14 16:54   ` Williams, Dan J
2021-07-15 16:47     ` Winiarska, Iwona
2021-07-15 18:13       ` Dan Williams
2021-07-15 18:29         ` Luck, Tony
2021-07-12 22:04 ` [PATCH 02/14] x86/cpu: Extract cpuid helpers to arch-independent Iwona Winiarska
2021-07-14 16:58   ` Williams, Dan J
2021-07-15 16:51     ` Winiarska, Iwona
2021-07-15 16:58       ` Winiarska, Iwona
2021-07-12 22:04 ` [PATCH 03/14] dt-bindings: Add generic bindings for PECI Iwona Winiarska
2021-07-12 22:04 ` [PATCH 04/14] dt-bindings: Add bindings for peci-aspeed Iwona Winiarska
2021-07-15 16:28   ` Rob Herring
2021-07-16 21:22     ` Winiarska, Iwona
2021-07-12 22:04 ` [PATCH 05/14] ARM: dts: aspeed: Add PECI controller nodes Iwona Winiarska
2021-07-12 22:04 ` [PATCH 06/14] peci: Add core infrastructure Iwona Winiarska
2021-07-14 17:19   ` Williams, Dan J
2021-07-16 21:08     ` Winiarska, Iwona
2021-07-16 21:50       ` Dan Williams
2021-07-17  6:12         ` gregkh
2021-07-17 20:54           ` Dan Williams
2021-07-12 22:04 ` [PATCH 07/14] peci: Add peci-aspeed controller driver Iwona Winiarska
2021-07-13  5:02   ` Randy Dunlap
2021-07-15 16:42     ` Winiarska, Iwona
2021-07-14 17:39   ` Williams, Dan J
2021-07-16 21:17     ` Winiarska, Iwona
2021-07-27  8:49   ` Zev Weiss
2021-07-29 14:03     ` Winiarska, Iwona
2021-07-29 18:15       ` Zev Weiss
2021-07-12 22:04 ` [PATCH 08/14] peci: Add device detection Iwona Winiarska
2021-07-14 21:05   ` Williams, Dan J
2021-07-16 21:20     ` Winiarska, Iwona
2021-07-27 17:49   ` Zev Weiss
2021-07-29 18:55     ` Winiarska, Iwona
2021-07-29 20:50       ` Zev Weiss
2021-07-30 20:10         ` Winiarska, Iwona
2021-07-12 22:04 ` [PATCH 09/14] peci: Add support for PECI device drivers Iwona Winiarska
2021-07-27 20:10   ` Zev Weiss
2021-07-27 21:23     ` Guenter Roeck
2021-07-29 21:17     ` Winiarska, Iwona
2021-07-29 23:22       ` Zev Weiss
2021-07-30 20:13         ` Winiarska, Iwona
2021-07-12 22:04 ` [PATCH 10/14] peci: Add peci-cpu driver Iwona Winiarska
2021-07-27 11:16   ` David Müller (ELSOFT AG)
2021-07-30 20:14     ` Winiarska, Iwona
2021-07-27 21:33   ` Zev Weiss
2021-07-30 21:21     ` Winiarska, Iwona
2021-07-12 22:04 ` [PATCH 11/14] hwmon: peci: Add cputemp driver Iwona Winiarska
2021-07-15 17:45   ` Guenter Roeck
2021-07-19 20:12     ` Winiarska, Iwona
2021-07-19 20:35       ` Guenter Roeck
2021-07-27  7:06   ` Zev Weiss
2021-07-30 21:51     ` Winiarska, Iwona
2021-07-30 22:04       ` Guenter Roeck
2021-07-12 22:04 ` [PATCH 12/14] hwmon: peci: Add dimmtemp driver Iwona Winiarska
2021-07-15 17:56   ` Guenter Roeck
2021-07-19 20:31     ` Winiarska, Iwona
2021-07-19 20:36       ` Guenter Roeck
2021-07-26 22:08   ` Zev Weiss
2021-07-30 22:48     ` Winiarska, Iwona
2021-07-12 22:04 ` [PATCH 13/14] docs: hwmon: Document PECI drivers Iwona Winiarska
2021-07-27 22:58   ` Zev Weiss
2021-07-28  0:49     ` Guenter Roeck
2021-08-02 11:39       ` Winiarska, Iwona [this message]
2021-08-02 11:37     ` Winiarska, Iwona
2021-08-04 17:52       ` Zev Weiss
2021-08-04 18:05         ` Guenter Roeck
2021-08-05 21:42           ` Winiarska, Iwona
2021-07-12 22:04 ` [PATCH 14/14] docs: Add PECI documentation Iwona Winiarska
2021-07-14 16:51 ` [PATCH 00/14] Introduce PECI subsystem Williams, Dan J
2021-07-15 17:33   ` Winiarska, Iwona
2021-07-15 19:34     ` Dan Williams

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