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a3e00c964f
Introduce a calculation to find a target's position in a region interleave. Perform a self-test of the calculation on user-defined regions. The region driver uses the kernel sort() function to put region targets in relative order. Positions are assigned based on each target's index in that sorted list. That relative sort doesn't consider the offset of a port into its parent port which causes some auto-discovered regions to fail creation. In one failure case, a 2 + 2 config (2 host bridges each with 2 endpoints), the sort puts all the targets of one port ahead of another port when they were expected to be interleaved. In preparation for repairing the autodiscovery region assembly, introduce a new method for discovering a target position in the region interleave. cxl_calc_interleave_pos() adds a method to find the target position by ascending from an endpoint to a root decoder. The calculation starts with the endpoint's local position and position in the parent port. It traverses towards the root decoder and examines both position and ways in order to allow the position to be refined all the way to the root decoder. This calculation: position = position * parent_ways + parent_pos; applied iteratively yields the correct position. Include a self-test that exercises this new position calculation against every successfully configured user-defined region. Signed-off-by: Alison Schofield <alison.schofield@intel.com> Link: https://lore.kernel.org/r/0ac32c75cf81dd8b86bf07d70ff139d33c2300bc.1698263080.git.alison.schofield@intel.com Signed-off-by: Dan Williams <dan.j.williams@intel.com> |
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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.