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docs: admin-guide: Add information about intel_pstate active mode 

Information about intel_pstate active mode is added in the doc.
This operation mode could be used to set on the hardware when it's
not activated. Status of the mode could be checked from sysfs file
i.e., /sys/devices/system/cpu/intel_pstate/status.
The information is already available in cpu-freq/intel-pstate.txt
documentation.

Signed-off-by: Natesh Sharma <nsharma@redhat.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
[jc: reformatted for width ]
Link: https://lore.kernel.org/r/20230427083706.49882-1-nsharma@redhat.com
This commit is contained in:
Natesh Sharma 2023-04-27 14:07:06 +05:30 committed by Jonathan Corbet
parent bd415b5c95
commit f02c20d9f1
1 changed files with 10 additions and 0 deletions
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Documentation/admin-guide/kernel-parameters.txt
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@ -2117,6 +2117,16 @@
disable
Do not enable intel_pstate as the default
scaling driver for the supported processors
active
Use intel_pstate driver to bypass the scaling
governors layer of cpufreq and provides it own
algorithms for p-state selection. There are two
P-state selection algorithms provided by
intel_pstate in the active mode: powersave and
performance. The way they both operate depends
on whether or not the hardware managed P-states
(HWP) feature has been enabled in the processor
and possibly on the processor model.
passive
Use intel_pstate as a scaling driver, but configure it
to work with generic cpufreq governors (instead of