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d84a7a654a
After more investigation on the hardware side, it appears that the hardware bug regarding 2^32 boundary reaching/crossing also affects other uses of the DMA engine, in particular the ones triggered by the context-info (image loader) mechanism. It also turns out that the bug only affects devices with gen2 TX hardware engine, so we don't need to change context info for gen3. The TX path workarounds are simpler to still keep for both though. Add the workaround to that code as well; this is a lot simpler as we have just a single way to allocate DMA memory there. I made the algorithm recursive (with a small limit) since it's actually (almost) impossible to hit this today - dma_alloc_coherent is currently documented to always return 32-bit addressable memory regardless of the DMA mask for it, and so we could only get REALLY unlucky to get the very last page in that area. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Luca Coelho <luciano.coelho@intel.com> |
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| kernel | ||
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| scripts | ||
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| .clang-format | ||
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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.