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Where IORT nodes for named components can describe simple DMA limits expressed as the number of address bits a device can drive, _DMA methods in AML can express more complex topologies, involving DMA translation in particular. Currently, we only take this _DMA method into account if it appears on a ACPI device node describing a PCIe root complex, but it is perfectly acceptable to use them for named components as well, so let's ensure we take them into account in those cases too. Note that such named components are expected to reside under a pseudo-bus node such as the ACPI0004 container device, which should be providing the _DMA method as well as a _CRS (as mandated by the ACPI spec). This is not enforced by the code however. Reported-by: Andrei Warkentin <awarkentin@vmware.com> Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Link: https://lore.kernel.org/r/20200420092753.9819-1-ardb@kernel.org Signed-off-by: Will Deacon <will@kernel.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 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.