search for: gpfifo

...a), such accesses on ARM might result in the other accessor to end up in an incoherent state. To address this, patches 1-3 add the ability to understand whether we are on a non-coherent architecture, implement a way to explicitly allocate coherent buffers buffers using the DMA API, and uses it for GPFIFOS and fences. Patch 4 also uses the DMA API to synchronize user-space allocated buffers when they are passed from the CPU to the GPU and vice-versa. Thanks to the feedback received on the previous revisions I believe this code looks rather good now. I also have extensively tested it and could not s...

...nd preparation for CPU access, as previously shown by Lucas (http://lists.freedesktop.org/archives/nouveau/2013-August/014029.html ). For these, we don't mind if the memory is not coherent and prefer to use the page allocator. - buffers that are used by the kernel, typically fences and GPFIFO buffers, are accessed rarely and thus should not trigger a costly flush or cache invalidation. For these, we want to guarantee coherent access and use the DMA API if necessary. This series attempts to implement this behavior by allowing the TTM_PL_FLAG_UNCACHED flag to be passed to nouveau_b...