summaryrefslogtreecommitdiff
path: root/Documentation
diff options
context:
space:
mode:
authorLukasz Luba <lukasz.luba@arm.com>2021-11-02 18:01:44 +0000
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2021-11-10 21:26:34 +0100
commit08374410a5ea3ff2fa9a87edd7d7ab15375b1c31 (patch)
tree3b6144cef691cdaf40c76f671a8ba90585dcbe3b /Documentation
parentd704aa0d44ade12660d4d7220b2a8d785b7b4247 (diff)
Documentation: power: Describe 'advanced' and 'simple' EM models
The Energy Model (EM) can be registered in two ways: 1) Using a helper function, which under the hood relies on OPP framework and DT entry in CPU node: 'dynamic-power-coefficient'. This is a 'simple' EM because it's tied to the math formula: Power = dynamic-power-coefficient * V^2 * f 2) Using em_dev_register_perf_domain() API function with a driver custom callback which provides power for each performance state. This is 'advanced' EM, since it can better reflect real power measurements for each performance state. It's not limited to any math formula and can better reflect real physics of the device. Add description of these two methods to the documentation, so developers could choose the suitable registration method (option). Signed-off-by: Lukasz Luba <lukasz.luba@arm.com> [ rjw: Changelog edits ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/power/energy-model.rst22
1 files changed, 22 insertions, 0 deletions
diff --git a/Documentation/power/energy-model.rst b/Documentation/power/energy-model.rst
index 7af0e1760962..5ac62a7b4b7c 100644
--- a/Documentation/power/energy-model.rst
+++ b/Documentation/power/energy-model.rst
@@ -84,6 +84,16 @@ CONFIG_ENERGY_MODEL must be enabled to use the EM framework.
2.2 Registration of performance domains
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+Registration of 'advanced' EM
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The 'advanced' EM gets it's name due to the fact that the driver is allowed
+to provide more precised power model. It's not limited to some implemented math
+formula in the framework (like it's in 'simple' EM case). It can better reflect
+the real power measurements performed for each performance state. Thus, this
+registration method should be preferred in case considering EM static power
+(leakage) is important.
+
Drivers are expected to register performance domains into the EM framework by
calling the following API::
@@ -103,6 +113,18 @@ to: return warning/error, stop working or panic.
See Section 3. for an example of driver implementing this
callback, or Section 2.4 for further documentation on this API
+Registration of 'simple' EM
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The 'simple' EM is registered using the framework helper function
+cpufreq_register_em_with_opp(). It implements a power model which is tight to
+math formula::
+
+ Power = C * V^2 * f
+
+The EM which is registered using this method might not reflect correctly the
+physics of a real device, e.g. when static power (leakage) is important.
+
2.3 Accessing performance domains
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^