diff mbox series

[v4,6/6] Documentation: amd_pstate: Update amd_pstate status sysfs for guided

Message ID 20230131052141.96475-7-wyes.karny@amd.com
State New
Headers
Series amd_pstate: Add guided autonomous mode support |

Commit Message

Wyes Karny Jan. 31, 2023, 5:21 a.m. UTC 
  Update amd_pstate status sysfs for guided mode.

Signed-off-by: Wyes Karny <wyes.karny@amd.com>
---
 Documentation/admin-guide/pm/amd-pstate.rst | 31 ++++++++++++++++-----
 1 file changed, 24 insertions(+), 7 deletions(-)

Comments

Bagas Sanjaya Jan. 31, 2023, 12:42 p.m. UTC | #1 
On 1/31/23 12:21, Wyes Karny wrote:
> diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst
> index 5304adf2fc2f..56a3d11f51a5 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.
>  

LGTM, thanks!

Reviewed-by: Bagas Sanjaya <bagasdotme@gmail.com>
Mario Limonciello Jan. 31, 2023, 1:12 p.m. UTC | #2 
On 1/30/23 23:21, Wyes Karny wrote:
> Update amd_pstate status sysfs for guided mode.
> 
> 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..56a3d11f51a5 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.
>   

Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
diff mbox series

Patch

diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst
index 5304adf2fc2f..56a3d11f51a5 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.