27 Jun
2011
27 Jun
'11
1:22 p.m.
On Monday 27 June 2011, Marek Szyprowski wrote:
On a related note, do you plan to make the CMA work use this transparently, or do you want to have a DMA_ATTR_LARGE or DMA_ATTR_CONTIGUOUS for CMA?
IMHO it will be better to hide the CMA from the drivers. Memory allocated from CMA doesn't really differ from the one allocated by dma_alloc_coherent() (which internally use alloc_pages()), so I really see no reason for adding additional attribute for it.
Ok, fair enough. On a semi-related topic, IIRC we still need to make sure that dma_alloc_coherent() pages are unmapped from the linear mapping. I hope this is independent of both CMA and this patch.
Arnd