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) |