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Perry Yuan authored
Add EPP driver support for AMD SoCs which support a dedicated MSR for
CPPC.  EPP is used by the DPM controller to configure the frequency that
a core operates at during short periods of activity.

The SoC EPP targets are configured on a scale from 0 to 255 where 0
represents maximum performance and 255 represents maximum efficiency.

The amd-pstate driver exports profile string names to userspace that are
tied to specific EPP values.

The balance_performance string (0x80) provides the best balance for
efficiency versus power on most systems, but users can choose other
strings to meet their needs as well.

$ cat /sys/devices/system/cpu/cpufreq/policy0/energy_performance_available_preferences
default performance balance_performance balance_power power

$ cat /sys/devices/system/cpu/cpufreq/policy0/energy_performance_preference
balance_performance

To enable the driver,it needs to add `amd_pstate=active` to kernel
command line and kernel will load the active mode epp driver

Acked-by: default avatarHuang Rui <ray.huang@amd.com>
Reviewed-by: default avatarMario Limonciello <Mario.Limonciello@amd.com>
Reviewed-by: default avatarWyes Karny <wyes.karny@amd.com>
Tested-by: default avatarWyes Karny <wyes.karny@amd.com>
Signed-off-by: default avatarPerry Yuan <Perry.Yuan@amd.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
ffa5096a
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Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.