Hello,

On Monday, June 27, 2011 3:22 PM Arnd Bergmann wrote:

On Monday 27 June 2011, Marek Szyprowski wrote:

quoted

quoted

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()

quoted

(which internally use alloc_pages()), so I really see no reason for

adding

quoted

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.

Right, that's one more big item that is still on the TODO list.

Best regards
-- 
Marek Szyprowski
Samsung Poland R&D Center


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