mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 11:18:45 +07:00
cd261c9832
Document the hwmon interface for the OCC. Signed-off-by: Eddie James <eajames@linux.ibm.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
113 lines
4.6 KiB
Plaintext
113 lines
4.6 KiB
Plaintext
Kernel driver occ-hwmon
|
|
=======================
|
|
|
|
Supported chips:
|
|
* POWER8
|
|
* POWER9
|
|
|
|
Author: Eddie James <eajames@linux.ibm.com>
|
|
|
|
Description
|
|
-----------
|
|
|
|
This driver supports hardware monitoring for the On-Chip Controller (OCC)
|
|
embedded on POWER processors. The OCC is a device that collects and aggregates
|
|
sensor data from the processor and the system. The OCC can provide the raw
|
|
sensor data as well as perform thermal and power management on the system.
|
|
|
|
The P8 version of this driver is a client driver of I2C. It may be probed
|
|
manually if an "ibm,p8-occ-hwmon" compatible device is found under the
|
|
appropriate I2C bus node in the device-tree.
|
|
|
|
The P9 version of this driver is a client driver of the FSI-based OCC driver.
|
|
It will be probed automatically by the FSI-based OCC driver.
|
|
|
|
Sysfs entries
|
|
-------------
|
|
|
|
The following attributes are supported. All attributes are read-only unless
|
|
specified.
|
|
|
|
The OCC sensor ID is an integer that represents the unique identifier of the
|
|
sensor with respect to the OCC. For example, a temperature sensor for the third
|
|
DIMM slot in the system may have a sensor ID of 7. This mapping is unavailable
|
|
to the device driver, which must therefore export the sensor ID as-is.
|
|
|
|
Some entries are only present with certain OCC sensor versions or only on
|
|
certain OCCs in the system. The version number is not exported to the user
|
|
but can be inferred.
|
|
|
|
temp[1-n]_label OCC sensor ID.
|
|
[with temperature sensor version 1]
|
|
temp[1-n]_input Measured temperature of the component in millidegrees
|
|
Celsius.
|
|
[with temperature sensor version >= 2]
|
|
temp[1-n]_type The FRU (Field Replaceable Unit) type
|
|
(represented by an integer) for the component
|
|
that this sensor measures.
|
|
temp[1-n]_fault Temperature sensor fault boolean; 1 to indicate
|
|
that a fault is present or 0 to indicate that
|
|
no fault is present.
|
|
[with type == 3 (FRU type is VRM)]
|
|
temp[1-n]_alarm VRM temperature alarm boolean; 1 to indicate
|
|
alarm, 0 to indicate no alarm
|
|
[else]
|
|
temp[1-n]_input Measured temperature of the component in
|
|
millidegrees Celsius.
|
|
|
|
freq[1-n]_label OCC sensor ID.
|
|
freq[1-n]_input Measured frequency of the component in MHz.
|
|
|
|
power[1-n]_input Latest measured power reading of the component in
|
|
microwatts.
|
|
power[1-n]_average Average power of the component in microwatts.
|
|
power[1-n]_average_interval The amount of time over which the power average
|
|
was taken in microseconds.
|
|
[with power sensor version < 2]
|
|
power[1-n]_label OCC sensor ID.
|
|
[with power sensor version >= 2]
|
|
power[1-n]_label OCC sensor ID + function ID + channel in the form
|
|
of a string, delimited by underscores, i.e. "0_15_1".
|
|
Both the function ID and channel are integers that
|
|
further identify the power sensor.
|
|
[with power sensor version 0xa0]
|
|
power[1-n]_label OCC sensor ID + sensor type in the form of a string,
|
|
delimited by an underscore, i.e. "0_system". Sensor
|
|
type will be one of "system", "proc", "vdd" or "vdn".
|
|
For this sensor version, OCC sensor ID will be the same
|
|
for all power sensors.
|
|
[present only on "master" OCC; represents the whole system power; only one of
|
|
this type of power sensor will be present]
|
|
power[1-n]_label "system"
|
|
power[1-n]_input Latest system output power in microwatts.
|
|
power[1-n]_cap Current system power cap in microwatts.
|
|
power[1-n]_cap_not_redundant System power cap in microwatts when
|
|
there is not redundant power.
|
|
power[1-n]_cap_max Maximum power cap that the OCC can enforce in
|
|
microwatts.
|
|
power[1-n]_cap_min Minimum power cap that the OCC can enforce in
|
|
microwatts.
|
|
power[1-n]_cap_user The power cap set by the user, in microwatts.
|
|
This attribute will return 0 if no user power
|
|
cap has been set. This attribute is read-write,
|
|
but writing any precision below watts will be
|
|
ignored, i.e. requesting a power cap of
|
|
500900000 microwatts will result in a power cap
|
|
request of 500 watts.
|
|
[with caps sensor version > 1]
|
|
power[1-n]_cap_user_source Indicates how the user power cap was
|
|
set. This is an integer that maps to
|
|
system or firmware components that can
|
|
set the user power cap.
|
|
|
|
The following "extn" sensors are exported as a way for the OCC to provide data
|
|
that doesn't fit anywhere else. The meaning of these sensors is entirely
|
|
dependent on their data, and cannot be statically defined.
|
|
|
|
extn[1-n]_label ASCII ID or OCC sensor ID.
|
|
extn[1-n]_flags This is one byte hexadecimal value. Bit 7 indicates the
|
|
type of the label attribute; 1 for sensor ID, 0 for
|
|
ASCII ID. Other bits are reserved.
|
|
extn[1-n]_input 6 bytes of hexadecimal data, with a meaning defined by
|
|
the sensor ID.
|