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A mirror of the official Linux kernel repository just in case
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The ACPI IVRS table can contain multiple IVHD blocks. Each block contains information used to initialize each IOMMU instance. Currently, init_iommu_all sequentially process IVHD block and initialize IOMMU instance one-by-one. However, certain features require all IOMMUs to be configured in the same way system-wide. In case certain IVHD blocks contain inconsistent information (most likely FW bugs), the driver needs to go through and try to revert settings on IOMMUs that have already been configured. A solution is to split IOMMU initialization into 3 phases: Phase1 : Processes information of the IVRS table for all IOMMU instances. This allow all IVHDs to be processed prior to enabling features. Phase2 : Early feature support check on all IOMMUs (using information in IVHD blocks. Phase3 : Iterates through all IOMMU instances and enabling features. Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> Link: https://lore.kernel.org/r/20220713225651.20758-5-suravee.suthikulpanit@amd.com Signed-off-by: Joerg Roedel <jroedel@suse.de> |
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| init | ||
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| kernel | ||
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| README | ||
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.