.. SPDX-License-Identifier: GPL-2.0-only
Kernel driver Ampere(R)'s Altra(R) SMpro hwmon
==============================================
Supported chips:
* Ampere(R) Altra(R)
Prefix: ``smpro``
Reference: `Altra SoC BMC Interface Specification`
Author: Thu Nguyen <thu@os.amperecomputing.com>
Description
-----------
The smpro-hwmon driver supports hardware monitoring for Ampere(R) Altra(R)
SoCs based on the SMpro co-processor (SMpro). The following sensor metrics
are supported by the driver:
* temperature
* voltage
* current
* power
The interface provides the registers to query the various sensors and
their values which are then exported to userspace by this driver.
Usage Notes
-----------
The driver creates at least two sysfs files for each sensor.
* ``<sensor_type><idx>_label`` reports the sensor label.
* ``<sensor_type><idx>_input`` returns the sensor value.
The sysfs files are allocated in the SMpro rootfs folder, with one root
directory for each instance.
When the SoC is turned off, the driver will fail to read registers and
return ``-ENXIO``.
Sysfs entries
-------------
The following sysfs files are supported:
* Ampere(R) Altra(R):
============ ============= ====== ===============================================
Name Unit Perm Description
============ ============= ====== ===============================================
temp1_input millicelsius RO SoC temperature
temp2_input millicelsius RO Max temperature reported among SoC VRDs
temp2_crit millicelsius RO SoC VRD HOT Threshold temperature
temp3_input millicelsius RO Max temperature reported among DIMM VRDs
temp4_input millicelsius RO Max temperature reported among Core VRDs
temp5_input millicelsius RO Temperature of DIMM0 on CH0
temp5_crit millicelsius RO MEM HOT Threshold for all DIMMs
temp6_input millicelsius RO Temperature of DIMM0 on CH1
temp6_crit millicelsius RO MEM HOT Threshold for all DIMMs
temp7_input millicelsius RO Temperature of DIMM0 on CH2
temp7_crit millicelsius RO MEM HOT Threshold for all DIMMs
temp8_input millicelsius RO Temperature of DIMM0 on CH3
temp8_crit millicelsius RO MEM HOT Threshold for all DIMMs
temp9_input millicelsius RO Temperature of DIMM0 on CH4
temp9_crit millicelsius RO MEM HOT Threshold for all DIMMs
temp10_input millicelsius RO Temperature of DIMM0 on CH5
temp10_crit millicelsius RO MEM HOT Threshold for all DIMMs
temp11_input millicelsius RO Temperature of DIMM0 on CH6
temp11_crit millicelsius RO MEM HOT Threshold for all DIMMs
temp12_input millicelsius RO Temperature of DIMM0 on CH7
temp12_crit millicelsius RO MEM HOT Threshold for all DIMMs
temp13_input millicelsius RO Max temperature reported among RCA VRDs
in0_input millivolts RO Core voltage
in1_input millivolts RO SoC voltage
in2_input millivolts RO DIMM VRD1 voltage
in3_input millivolts RO DIMM VRD2 voltage
in4_input millivolts RO RCA VRD voltage
cur1_input milliamperes RO Core VRD current
cur2_input milliamperes RO SoC VRD current
cur3_input milliamperes RO DIMM VRD1 current
cur4_input milliamperes RO DIMM VRD2 current
cur5_input milliamperes RO RCA VRD current
power1_input microwatts RO Core VRD power
power2_input microwatts RO SoC VRD power
power3_input microwatts RO DIMM VRD1 power
power4_input microwatts RO DIMM VRD2 power
power5_input microwatts RO RCA VRD power
============ ============= ====== ===============================================
Example::
# cat in0_input
830
# cat temp1_input
37000
# cat curr1_input
9000
# cat power5_input
19500000