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Replacing kmalloc/kfree/dma_map_single/dma_unmap_single() with dma_alloc_coherent/dma_free_coherent() helps to reduce code size, and simplify the code, and coherent DMA will not clear the cache every time. The SOC that this driver supports does not have incoherent DMA, so this makes the code follow the DMA API properly with no performance impact. Currently there are missing dma sync calls around the DMA transfers. Link: https://lore.kernel.org/r/20210926061116.282-1-caihuoqing@baidu.com Signed-off-by: Cai Huoqing <caihuoqing@baidu.com> Reviewed-by: Wenpeng Liang <liangwenpeng@huawei.com> Tested-by: Wenpeng Liang <liangwenpeng@huawei.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
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.