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6df63b7ebd
The physical address to the directory table is currently encoded using the following bit layout for IOMMU v2. 31:12 - Address bit 31:0 11: 4 - Address bit 39:32 This is also the bit layout used by the vendor kernel. However, testing has shown that addresses to the directory/page tables and memory pages are all encoded using the same bit layout. IOMMU v1: 31:12 - Address bit 31:0 IOMMU v2: 31:12 - Address bit 31:0 11: 8 - Address bit 35:32 7: 4 - Address bit 39:36 Change to use the mk_dtentries ops to encode the directory table address correctly. The value written to DTE_ADDR may include the valid bit set, a bit that is ignored and DTE_ADDR reg read it back as 0. This also update the bit layout comment for the page address and the number of nybbles that are read back for DTE_ADDR comment. These changes render the dte_addr_phys and dma_addr_dte ops unused and is removed. Fixes: |
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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.