Kernel Driver IBMPOWERNV

Supported systems:

  • Any recent IBM P servers based on POWERNV platform

Author: Neelesh Gupta

Description

This driver implements reading the platform sensors data like temperature/fan/ voltage/power for ‘POWERNV’ platform.

The driver uses the platform device infrastructure. It probes the device tree for sensor devices during the __init phase and registers them with the ‘hwmon’. ‘hwmon’ populates the ‘sysfs’ tree having attribute files, each for a given sensor type and its attribute data.

All the nodes in the DT appear under “/ibm,opal/sensors” and each valid node in the DT maps to an attribute file in ‘sysfs’. The node exports unique ‘sensor-id’ which the driver uses to make an OPAL call to the firmware.

Usage notes

The driver is built statically with the kernel by enabling the config CONFIG_SENSORS_IBMPOWERNV. It can also be built as module ‘ibmpowernv’.

Sysfs attributes

fanX_input Measured RPM value.
fanX_min Threshold RPM for alert generation.
fanX_fault
  • 0: No fail condition
  • 1: Failing fan
tempX_input Measured ambient temperature.
tempX_max Threshold ambient temperature for alert generation.
tempX_highest Historical maximum temperature
tempX_lowest Historical minimum temperature
tempX_enable

Enable/disable all temperature sensors belonging to the sub-group. In POWER9, this attribute corresponds to each OCC. Using this attribute each OCC can be asked to disable/enable all of its temperature sensors.

  • 1: Enable
  • 0: Disable
inX_input Measured power supply voltage (millivolt)
inX_fault
  • 0: No fail condition.
  • 1: Failing power supply.
inX_highest Historical maximum voltage
inX_lowest Historical minimum voltage
inX_enable

Enable/disable all voltage sensors belonging to the sub-group. In POWER9, this attribute corresponds to each OCC. Using this attribute each OCC can be asked to disable/enable all of its voltage sensors.

  • 1: Enable
  • 0: Disable
powerX_input Power consumption (microWatt)
powerX_input_highest Historical maximum power
powerX_input_lowest Historical minimum power
powerX_enable

Enable/disable all power sensors belonging to the sub-group. In POWER9, this attribute corresponds to each OCC. Using this attribute each OCC can be asked to disable/enable all of its power sensors.

  • 1: Enable
  • 0: Disable
currX_input Measured current (milliampere)
currX_highest Historical maximum current
currX_lowest Historical minimum current
currX_enable

Enable/disable all current sensors belonging to the sub-group. In POWER9, this attribute corresponds to each OCC. Using this attribute each OCC can be asked to disable/enable all of its current sensors.

  • 1: Enable
  • 0: Disable
energyX_input Cumulative energy (microJoule)