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AMD heterogeneous designs include two types of cores: * Performance * Efficiency Each core type has different highest performance values configured by the platform. Drivers such as amd_pstate need to identify the type of core to correctly set an appropriate boost numerator to calculate the maximum frequency. X86_FEATURE_AMD_HETEROGENEOUS_CORES is used to identify whether the SoC supports heterogeneous core type by reading CPUID leaf Fn_0x80000026. On performance cores the scaling factor of 196 is used. On efficiency cores the scaling factor is the value reported as the highest perf. Efficiency cores have the same preferred core rankings. Suggested-by: Perry Yuan <perry.yuan@amd.com> Signed-off-by: Mario Limonciello <mario.limonciello@amd.com> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Link: https://lore.kernel.org/r/20241025171459.1093-6-mario.limonciello@amd.com
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 reStructuredText 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.