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SCMI v3.2 adds PERF protocol support to optionally define performance domains that cannot be represented on a linear scale; the platform firmware can declare the performance levels of a domain as being 'level indexed' and provide an indicative frequency associated to each of those levels, with such indexes not required anymore to be contiguous nor to satisfy any linear-scaling constraint: when level-indexing is available for a domain, the platform will expect to deal with SCMI requests using indexes instead of performance levels for that domain. Add level-indexing mode support to the PERF protocol implementation while maintaining unchanged the protocol operations interface exposed by PERF; all the required mapping from performamce levels/frequencies to the corresponding level indexes is carried out transparently by the core PERF protocol support: as a consequence no change is either required in any SCMI driver using the PERF protocol, even when using level indexing. Signed-off-by: Cristian Marussi <cristian.marussi@arm.com> Link: https://lore.kernel.org/r/20230717161246.1761777-3-cristian.marussi@arm.com Signed-off-by: Sudeep Holla <sudeep.holla@arm.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 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.