Commit 1056d314 authored Nov 17, 2022 by Perry Yuan Committed by Rafael J. Wysocki Nov 22, 2022

Documentation: add amd-pstate kernel command line options



Add a new amd pstate driver command line option to enable driver passive
working mode via MSR and shared memory interface to request desired
performance within abstract scale and the power management firmware
(SMU) convert the perf requests into actual hardware pstates.

Also the `disable` parameter can disable the pstate driver loading by
adding `amd_pstate=disable` to kernel command line.

Acked-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Tested-by: Wyes Karny <wyes.karny@amd.com>
Signed-off-by: Perry Yuan <Perry.Yuan@amd.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

parent 8a2cbf72

Documentation/admin-guide/kernel-parameters.txt

+11 −0

Original line number	Diff line number	Diff line
		@@ -6959,3 +6959,14 @@
		memory, and other data can't be written using
		xmon commands.
		off xmon is disabled.

		amd_pstate= [X86]
		disable
		Do not enable amd_pstate as the default
		scaling driver for the supported processors
		passive
		Use amd_pstate as a scaling driver, driver requests a
		desired performance on this abstract scale and the power
		management firmware translates the requests into actual
		hardware states (core frequency, data fabric and memory
		clocks etc.)