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6806f2c70c
The IOMMU-backed DMA API support has now been in place for a while and proven stable, so there's no real need to keep most of Juno's SMMUs disabled. The USB, HDLCDs, and CoreSight ETR all just need to map RAM buffers for DMA - enabling their SMMUs obviates CPU bounce buffering for USB's streaming DMA to the upper memory bank, and lets the other two allocate their relatively large coherent buffers without pressuring CMA. Some more software work is still needed for the DMA-330 and PCIe before those can accommodate SMMU translation correctly in all cases, so we leave those alone for now. Tested-by: Liviu Dudau <Liviu.Dudau@arm.com> [only HDLCD] Acked-by: Liviu Dudau <Liviu.Dudau@arm.com> Signed-off-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> |
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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.