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0b9f2bd00f
The fallback S/G buffer allocation for x86 used the addresses deduced from the page allocations blindly. It broke the allocations on IOMMU and made us to work around with a hackish DMA ops check. For cleaning up those messes, this patch switches to the proper DMA mapping API usages with the standard sg-table instead. By introducing the sg-table, the address table isn't needed, but for keeping the original allocation sizes for freeing, replace it with the array keeping the number of pages. The get_addr callback is changed to use the existing one for non-contiguous buffers. (Also it's the reason sg_table is put at the beginning of struct snd_dma_sg_fallback.) And finally, the hackish workaround that checks the DMA ops is dropped now. Link: https://patch.msgid.link/20240912155227.4078-3-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
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 reStructuredText 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.