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The ACPI CXL Fixed Memory Window Structure (CFMWS) defines multiple methods to determine which host bridge provides access to a given endpoint relative to that device's position in the interleave. The "Interleave Arithmetic" defines either a "standard modulo" / round-random algorithm, or "xormap" based algorithm which can be defined as a non-linear transform. Given that there are already more options beyond "standard modulo" and that "xormap" may turn out to be ACPI CXL specific, provide a callback for the region provisioning code to map endpoint positions back to expected host bridge id (cxl_dport target). For now just support the simple modulo math case and save the xormap for a follow-on change. Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Link: https://lore.kernel.org/r/20220624041950.559155-14-dan.j.williams@intel.com Signed-off-by: Dan Williams <dan.j.williams@intel.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.