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850438e1d5
Allocate space for level-2 IOMMU translation tables on demand. This should save memory in most cases but means that map_pages() can now fail with -ENOMEM. Unused pages are retained for re-use. Move all dma_sync* calls into map and unmap functions rather than batching them up. This makes it easier to ensure they are safely balanced, now that the tables are held as separate pages. Add OF properties to override the default aperture size (2GB) and base address (40GB); this doesn't include any dma-iova-offset. Various tidy-ups. The internal representation of aperture limits *does* include dma_iova_offset, as that is more commonly useful. Clarify the distinction between Linux pages and IOMMU table pages. Fix wrong definition of MMMU_CTRL_PT_INVALID_EN flag. Signed-off-by: Nick Hollinghurst <nick.hollinghurst@raspberrypi.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.
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.
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