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From: Wyes Karny <wyes.karny@amd.com>
To: Rafael J Wysocki <rafael@kernel.org>,
	Huang Rui <ray.huang@amd.com>, Jonathan Corbet <corbet@lwn.net>,
	Viresh Kumar <viresh.kumar@linaro.org>,
	<Mario.Limonciello@amd.com>, <Perry.Yuan@amd.com>,
	Ananth Narayan <ananth.narayan@amd.com>, <gautham.shenoy@amd.com>
Cc: <linux-doc@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<linux-pm@vger.kernel.org>, Bagas Sanjaya <bagasdotme@gmail.com>,
	<santosh.shukla@amd.com>, Len Brown <lenb@kernel.org>,
	Robert Moore <robert.moore@intel.com>,
	Borislav Petkov <bp@suse.de>, Wyes Karny <wyes.karny@amd.com>
Subject: [PATCH v3 6/6] Documentation: amd_pstate: Update amd_pstate status sysfs for guided
Date: Thu, 19 Jan 2023 11:50:17 +0000	[thread overview]
Message-ID: <20230119115017.10188-7-wyes.karny@amd.com> (raw)
In-Reply-To: <20230119115017.10188-1-wyes.karny@amd.com>

Update amd_pstate status sysfs for guided mode.

Signed-off-by: Wyes Karny <wyes.karny@amd.com>
---
 Documentation/admin-guide/pm/amd-pstate.rst | 32 ++++++++++++++++-----
 1 file changed, 25 insertions(+), 7 deletions(-)

diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst
index 5304adf2fc2f..d85a141109e5 100644
--- a/Documentation/admin-guide/pm/amd-pstate.rst
+++ b/Documentation/admin-guide/pm/amd-pstate.rst
@@ -303,13 +303,19 @@ 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 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 +344,15 @@ 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 +373,9 @@ 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


  parent reply	other threads:[~2023-01-19 11:54 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-01-19 11:50 [PATCH v3 0/6] amd_pstate: Add guided autonomous mode support Wyes Karny
2023-01-19 11:50 ` [PATCH v3 1/6] acpi: cppc: Add min and max perf reg writing support Wyes Karny
2023-01-19 11:50 ` [PATCH v3 2/6] acpi: cppc: Add auto select register read/write support Wyes Karny
2023-01-19 11:50 ` [PATCH v3 3/6] cpufreq: amd_pstate: Add guided autonomous mode Wyes Karny
2023-01-19 11:50 ` [PATCH v3 4/6] Documentation: amd_pstate: Move amd_pstate param to alphabetical order Wyes Karny
2023-01-19 11:50 ` [PATCH v3 5/6] cpufreq: amd_pstate: Add guided mode control support via sysfs Wyes Karny
2023-01-19 11:50 ` Wyes Karny [this message]
2023-01-19 12:30   ` [PATCH v3 6/6] Documentation: amd_pstate: Update amd_pstate status sysfs for guided Bagas Sanjaya
2023-01-20  4:16     ` Wyes Karny
2023-01-20  9:18 ` [PATCH v3 0/6] amd_pstate: Add guided autonomous mode support Huang Rui
2023-01-20  9:55   ` Wyes Karny
2023-01-24 20:40 ` Tor Vic
2023-01-25 10:25   ` Wyes Karny
2023-01-31  5:34   ` Wyes Karny
2023-02-01 18:15     ` Tor Vic

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