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Message-Id: <20220125011104.2480133-13-iwona.winiarska@intel.com>
Date: Tue, 25 Jan 2022 02:11:03 +0100
From: Iwona Winiarska <iwona.winiarska@...el.com>
To: linux-kernel@...r.kernel.org, openbmc@...ts.ozlabs.org,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: devicetree@...r.kernel.org, linux-aspeed@...ts.ozlabs.org,
linux-arm-kernel@...ts.infradead.org, linux-hwmon@...r.kernel.org,
linux-doc@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
Joel Stanley <joel@....id.au>,
Andrew Jeffery <andrew@...id.au>,
Jean Delvare <jdelvare@...e.com>,
Guenter Roeck <linux@...ck-us.net>,
Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
Jonathan Corbet <corbet@....net>,
Borislav Petkov <bp@...en8.de>,
Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
Tony Luck <tony.luck@...el.com>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Dan Williams <dan.j.williams@...el.com>,
Randy Dunlap <rdunlap@...radead.org>,
Zev Weiss <zweiss@...inix.com>,
David Muller <d.mueller@...oft.ch>,
Dave Hansen <dave.hansen@...el.com>,
Billy Tsai <billy_tsai@...eedtech.com>,
Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com>,
Iwona Winiarska <iwona.winiarska@...el.com>
Subject: [PATCH v6 12/13] docs: hwmon: Document PECI drivers
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 Temperature Sensor on DIMM readings.
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>
Acked-by: Guenter Roeck <linux@...ck-us.net>
---
Documentation/hwmon/index.rst | 2 +
Documentation/hwmon/peci-cputemp.rst | 90 +++++++++++++++++++++++++++
Documentation/hwmon/peci-dimmtemp.rst | 57 +++++++++++++++++
MAINTAINERS | 2 +
4 files changed, 151 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 df20022c741f..f387f661e1d7 100644
--- a/Documentation/hwmon/index.rst
+++ b/Documentation/hwmon/index.rst
@@ -161,6 +161,8 @@ 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..fe0422248dc5
--- /dev/null
+++ b/Documentation/hwmon/peci-cputemp.rst
@@ -0,0 +1,90 @@
+.. 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 temperature of the CPU package scaled
+ to match DTS thermal profile.
+temp2_max Provides thermal control temperature of the CPU package
+ which is also known as Tcontrol.
+temp2_crit Provides shutdown temperature of the CPU package which
+ is also known as the maximum processor junction
+ temperature, Tjmax or Tprochot.
+temp2_crit_hyst Provides the hysteresis value from Tcontrol to Tjmax of
+ the CPU package.
+
+temp3_label "Tcontrol"
+temp3_input Provides current Tcontrol temperature of the CPU
+ package which is also known as Fan Temperature target.
+ Indicates the relative value from thermal monitor trip
+ temperature at which fans should be engaged.
+temp3_crit Provides Tcontrol critical value of the CPU package
+ which is same to Tjmax.
+
+temp4_label "Tthrottle"
+temp4_input Provides current Tthrottle temperature of the CPU
+ package. Used for throttling temperature. If this value
+ is allowed and lower than Tjmax - the throttle will
+ occur and reported at lower than Tjmax.
+
+temp5_label "Tjmax"
+temp5_input Provides the maximum junction temperature, Tjmax of the
+ CPU package.
+
+temp[6-N]_label Provides string "Core X", where X is resolved core
+ number.
+temp[6-N]_input Provides current temperature of each core.
+
+======================= =======================================================
diff --git a/Documentation/hwmon/peci-dimmtemp.rst b/Documentation/hwmon/peci-dimmtemp.rst
new file mode 100644
index 000000000000..e562aed620de
--- /dev/null
+++ b/Documentation/hwmon/peci-dimmtemp.rst
@@ -0,0 +1,57 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Kernel driver peci-dimmtemp
+===========================
+
+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
+Temperature sensor on DIMM readings 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
+-------------------
+
+======================= =======================================================
+
+temp[N]_label Provides string "DIMM CI", where C is DIMM channel and
+ I is DIMM index of the populated DIMM.
+temp[N]_input Provides current temperature of the populated DIMM.
+temp[N]_max Provides thermal control temperature of the DIMM.
+temp[N]_crit Provides shutdown temperature of the DIMM.
+
+======================= =======================================================
+
+Note:
+ DIMM temperature attributes will appear when the client CPU's BIOS
+ completes memory training and testing.
diff --git a/MAINTAINERS b/MAINTAINERS
index 369ac3524f33..d821aeaaa2d3 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -15103,6 +15103,8 @@ PECI HARDWARE MONITORING DRIVERS
M: Iwona Winiarska <iwona.winiarska@...el.com>
L: linux-hwmon@...r.kernel.org
S: Supported
+F: Documentation/hwmon/peci-cputemp.rst
+F: Documentation/hwmon/peci-dimmtemp.rst
F: drivers/hwmon/peci/
PECI SUBSYSTEM
--
2.31.1
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