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Now that it's simple to discover the necessary reservations for a given device/IOMMU combination, let's wire up the appropriate handling. Basic reserved regions and direct-mapped regions we simply have to carve out of IOVA space (the IOMMU core having already mapped the latter before attaching the device). For hardware MSI regions, we also pre-populate the cookie with matching msi_pages. That way, irqchip drivers which normally assume MSIs to require mapping at the IOMMU can keep working without having to special-case their iommu_dma_map_msi_msg() hook, or indeed be aware at all of quirks preventing the IOMMU from translating certain addresses. Reviewed-by: Eric Auger <eric.auger@redhat.com> Signed-off-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Joerg Roedel <jroedel@suse.de> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. 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.