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The Intel Speed Select Technology - Base Frequency (SST-BF) feature lets the user control base frequency. If some critical workload threads demand constant high guaranteed performance, then this feature can be used to execute the thread at higher base frequency on specific sets of CPUs (high priority CPUs) at the cost of lower base frequency (low priority CPUs) on other CPUs. Two new IOCTLs are added: ISST_IF_GET_BASE_FREQ_INFO : Get frequency information for high and low priority CPUs ISST_IF_GET_BASE_FREQ_CPU_MASK : CPUs capable of higher frequency Once an instance is identified, read or write from correct MMIO offset for a given field as defined in the specification. For details on SST-BF operations using intel-speed-selet utility, refer to: Documentation/admin-guide/pm/intel-speed-select.rst under the kernel documentation Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Reviewed-by: Zhang Rui <rui.zhang@intel.com> Tested-by: Pragya Tanwar <pragya.tanwar@intel.com> Link: https://lore.kernel.org/r/20230308070642.1727167-7-srinivas.pandruvada@linux.intel.com Signed-off-by: Hans de Goede <hdegoede@redhat.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.