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Assuming that any SMMU can enforce coherency for any device is clearly nonsense. Although technically even a single SMMU instance can be wired up to only be capable of emitting coherent traffic for some of the devices it translates, it's a fairly realistic approximation that if the SMMU's pagetable walker is wired up to a coherent interconnect then all its translation units probably are too, and conversely that lack of coherent table walks implies a non-coherent system in general. Either way it's still less inaccurate than what we've been claiming so far. Signed-off-by: Robin Murphy <robin.murphy@arm.com> Link: https://lore.kernel.org/r/106c9741415f0b6358c72d53ae9c78c553a2b45c.1660574547.git.robin.murphy@arm.com Signed-off-by: Joerg Roedel <jroedel@suse.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.