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15c72f824b
Provide a template and the necessary callbacks to create PCI/MSI and PCI/MSI-X domains. The domains are created when MSI or MSI-X is enabled. The domain's lifetime is either the device lifetime or in case that e.g. MSI-X was tried first and failed, then the MSI-X domain is removed and a MSI domain is created as both are mutually exclusive and reside in the default domain ID slot of the per device domain pointer array. Also expand pci_msi_domain_supports() to handle feature checks correctly even in the case that the per device domain was not yet created by checking the features supported by the MSI parent. Add the necessary setup calls into the MSI and MSI-X enable code path. These setup calls are backwards compatible. They return success when there is no parent domain found, which means the existing global domains or the legacy allocation path keep just working. Co-developed-by: Ahmed S. Darwish <darwi@linutronix.de> Signed-off-by: Ahmed S. Darwish <darwi@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Kevin Tian <kevin.tian@intel.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20221124232325.975388241@linutronix.de
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.