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In preparation for switch port enumeration while also preserving the potential for multi-domain / multi-root CXL topologies. Introduce a 'struct device' generic mechanism for retrieving a root CXL port, if one is registered. Note that the only known multi-domain CXL configurations are running the cxl_test unit test on a system that also publishes an ACPI0017 device. With this in hand the nvdimm-bridge lookup can be with device_find_child() instead of bus_find_device() + custom mocked lookup infrastructure in cxl_test. The mechanism looks for a 2nd level port since the root level topology is platform-firmware specific and the 2nd level down follows standard PCIe topology expectations. The cxl_acpi 2nd level is associated with a PCIe Root Port. Reported-by: Ben Widawsky <ben.widawsky@intel.com> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Link: https://lore.kernel.org/r/164367562182.225521.9488555616768096049.stgit@dwillia2-desk3.amr.corp.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.