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From the DWC EP databook 5.96a, section "3.5.7.1.4 General Rules for BAR Setup (Fixed Mask or Programmable Mask Schemes Only)": "Any pair (for example BARs 0 and 1) can be configured as one 64-bit BAR, two 32-bit BARs, or one 32-bit BAR." "BAR pairs cannot overlap to form a 64-bit BAR. For example, you cannot combine BARs 1 and 2 to form a 64-bit BAR." While this limitation does exist in some other PCI endpoint controllers, e.g. cdns_pcie_ep_set_bar(), the limitation does not appear to be defined in the PCIe specification itself, thus add an explicit check for this in dw_pcie_ep_set_bar() (rather than pci_epc_set_bar()). Link: https://lore.kernel.org/linux-pci/20240528134839.8817-2-cassel@kernel.org Signed-off-by: Niklas Cassel <cassel@kernel.org> Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
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.