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When bifurcated to x2, Xeon 6 Root Port performance is sensitive to the configuration of Extended Tags, Max Read Request Size (MRRS), and 10-Bit Tag Requester (note: there is currently no 10-Bit Tag support in the kernel). While those can be configured to the recommended values by FW, kernel may decide to overwrite the initial values. Add a quirk that disallows enabling Extended Tags and setting MRRS larger than 128B for devices under Xeon 6 Root Ports if the Root Port is bifurcated to x2. Use the host bridge's enable_device hook to overwrite MRRS if it's set to >128B for the device to be enabled. The earlier attempts to implement this quirk polluted PCI core code with the checks necessary to support this quirk. Using the enable_device hook keeps the quirk well-contained, away from the PCI core code. Suggested-by: Lukas Wunner <lukas@wunner.de> Link: https://cdrdv2.intel.com/v1/dl/getContent/837176 Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> [bhelgaas: 2x -> x2, rename quirk] Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Lukas Wunner <lukas@wunner.de> Reviewed-by: Dan Williams <dan.j.williams@intel.com> Link: https://patch.msgid.link/20250610114802.7460-1-ilpo.jarvinen@linux.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 reStructuredText 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.