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You would hope that if you have a GICv3 in your system, you'd use the ITS, as it provides a large interrupt ID space and device isolation. Sadly, some SoC integrations are less than perfect, and the ITS is not usesable on those. The only solution for these systems is to use the MBI interface, and rely on a very small number of possible vectors. This patch thus adds minimal support for PCI/MSI on top of the GICv3 MBI driver. Please don't use it if you can avoid it. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Cc: Rob Herring <robh@kernel.org> Cc: Jason Cooper <jason@lakedaemon.net> Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com> Cc: Miquel Raynal <miquel.raynal@bootlin.com> Link: https://lkml.kernel.org/r/20180508121438.11301-9-marc.zyngier@arm.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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.