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The ARM SMMU identity mapping performance was poor compared with the DMA mode. It was found that enable caching would restore the performance back to normal. The S2CRB_TLBEN bit in the ACR register would allow for caching of the stream to context register bypass transaction information. Reviewed-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Feng Kan <fkan@apm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.