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    Subject[PATCH v7 6/6] Documentation: cpufreq: amd-pstate: Update amd_pstate status sysfs for guided
    Date
    Update amd_pstate status sysfs for guided mode.

    Acked-by: Huang Rui <ray.huang@amd.com>
    Reviewed-by: Bagas Sanjaya <bagasdotme@gmail.com>
    Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
    Signed-off-by: Wyes Karny <wyes.karny@amd.com>
    ---
    Documentation/admin-guide/pm/amd-pstate.rst | 31 ++++++++++++++++-----
    1 file changed, 24 insertions(+), 7 deletions(-)

    diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst
    index 5304adf2fc2f..95d2d0a803fe 100644
    --- a/Documentation/admin-guide/pm/amd-pstate.rst
    +++ b/Documentation/admin-guide/pm/amd-pstate.rst
    @@ -303,13 +303,18 @@ 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,
    +non-autonomous (passive) mode and guided autonomous (guided) 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, maximum 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 +343,15 @@ 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 +372,9 @@ 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
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