Update amd_pstate status sysfs for guided mode. Signed-off-by: Wyes Karny <wyes.karny@xxxxxxx> --- Documentation/admin-guide/pm/amd-pstate.rst | 29 ++++++++++++++++----- 1 file changed, 22 insertions(+), 7 deletions(-) diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst index 55396981266a..92fa22e45a2b 100644 --- a/Documentation/admin-guide/pm/amd-pstate.rst +++ b/Documentation/admin-guide/pm/amd-pstate.rst @@ -303,13 +303,16 @@ efficiency frequency management method on AMD processors. AMD Pstate Driver Operation Modes ================================= -``amd_pstate`` CPPC has two operation modes: CPPC Autonomous(active) mode and -CPPC non-autonomous(passive) mode. -active mode and passive mode can be chosen by different kernel parameters. -When in Autonomous mode, CPPC ignores requests done in the Desired Performance -Target register and takes into account only the values set to the Minimum requested -performance, Maximum requested performance, and Energy Performance Preference -registers. When Autonomous is disabled, it only considers the Desired Performance Target. +``amd_pstate`` CPPC has 3 operation modes: autonomous (active) mode, guided +autonomous (guided) mode and non-autonomous (passive) mode. +Active/passive/guided mode can be chosen by different kernel parameters. In +autonomous mode, platform ignores the desired performance level request and +takes into account only the values set to the Minimum requested performance, +Maximum requested performance and Energy Performance Preference registers. In +non-autonomous mode, platform gets desired performance level from OS directly +through Desired Performance Register. In guided-autonomous mode, platform sets +operating performance level autonomously according to the current workload and +within the limits set by OS through min and max performance registers. Active Mode ------------ @@ -338,6 +341,15 @@ to the Performance Reduction Tolerance register. Above the nominal performance l processor must provide at least nominal performance requested and go higher if current operating conditions allow. +Guided Mode +----------- + +``amd_pstate=guided`` + +If ``amd_pstate=guided`` is passed to kernel command line option then this mode +is activated. In this mode, driver requests minimum and maximum performance +level and the platform autonomously selects a performance level in this range +and appropriate to the current workload. User Space Interface in ``sysfs`` ================================= @@ -358,6 +370,9 @@ control its functionality at the system level. They are located in the "passive" The driver is functional and in the ``passive mode`` + "guided" + The driver is functional and in the ``guided mode`` + "disable" The driver is unregistered and not functional now. -- 2.34.1
