2014-05-20 오후 5:32, Joonsoo Kim 쓴 글:
On Tue, May 20, 2014 at 04:05:52PM +0900, Gioh Kim wrote:
That case, device-specific coherent memory allocation, is handled at dma_alloc_coherent in arm_dma_alloc.
__dma_alloc handles only general coherent memory allocation.
I'm sorry missing mention about it.
Hello,
AFAIK, *coherent* memory allocation is different with *contiguous* memory
allocation(CMA). So we need to handle the case I mentioned.
Yes, I confused the coherent memory aand contiguous memory. It's my mistake.
So I checked dma_alloc_from_contiguous and found dev_get_cma_area function.
The dev_get_cma_area returns device-specific cma if it exists or default global-cma.
I think __alloc_from_contiguous doesn't distinguish device-specific cma area and global cma.
The purpose of __alloc_from_contiguous is allocation of contiguous memory from any cma area, not device-specific area.
If my assumption is right, __alloc_from_contiguous can be replaced with __alloc_remap_buffer without checking device-specific cma area.
What do you think about it?
Thanks.
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