powerpc/powernv: Add documentation for the opal sensor_groups sysfs interfaces (32377bd2) · Commits · 戴 / test

Commit ("powerpc/powernv: Add support to clear sensor groups data") added a mechanism to clear sensor-group data via a sysfs interface. However, the ABI for that interface has not been documented. This patch documents the ABI for the sysfs interface for sensor-groups and clearing the sensor-groups. This patch was originally sent by Shilpasri G Bhat on the mailing list: https://lkml.org/lkml/2018/8/1/85 Signed-off-by:

Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com> Signed-off-by:

Gautham R. Shenoy <ego@linux.vnet.ibm.com> Signed-off-by:

Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/1574776274-22355-1-git-send-email-ego@linux.vnet.ibm.com

Documentation/ABI/testing/sysfs-firmware-opal-sensor-groups

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Original line number	Diff line number	Diff line
		What: /sys/firmware/opal/sensor_groups
		Date: August 2017
		Contact: Linux for PowerPC mailing list <linuxppc-dev@ozlabs.org>
		Description: Sensor groups directory for POWER9 powernv servers

		Each folder in this directory contains a sensor group
		which are classified based on type of the sensor
		like power, temperature, frequency, current, etc. They
		can also indicate the group of sensors belonging to
		different owners like CSM, Profiler, Job-Scheduler

		What: /sys/firmware/opal/sensor_groups/<sensor_group_name>/clear
		Date: August 2017
		Contact: Linux for PowerPC mailing list <linuxppc-dev@ozlabs.org>
		Description: Sysfs file to clear the min-max of all the sensors
		belonging to the group.

		Writing 1 to this file will clear the minimum and
		maximum values of all the sensors in the group.
		In POWER9, the min-max of a sensor is the historical minimum
		and maximum value of the sensor cached by OCC.

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