On 1/30/2013 3:45 PM, Dan Carpenter wrote:
On Wed, Jan 30, 2013 at 03:36:48PM -0600, Steve Wise wrote:
I wonder, then, what the correct service is to get the cpu physical
address from a kernel virtual address returned from
dma_alloc_coherent()? I think this is correct as-is, since I think
dma_alloc_coherent() falls under the "directly mapped" addresses in
the virt_to_phys() prototype comment.
Here is another relevant comment I should have included.
commit ae6a5d37725853325a2b3460165fbc5613ce2916
Author: Russell King <[email protected]>
Date: Tue Nov 20 12:17:51 2012 +0000
ASoC: kirkwood-dma: fix use of virt_to_phys()
This is part of a patch found in Rabeeh Khoury's git tree for the
cubox.
You can not use virt_to_phys() on the address returned from
dma_alloc_coherent(); it may not be part of the kernel direct-mapped
memory. Fix this to use the DMA address instead.
Signed-off-by: Russell King <[email protected]>
Signed-off-by: Mark Brown <[email protected]>
I don't know the details though, and I certainly don't know how
someone would fix this. ;)
How do I map the dma address into a physical address suitable for
passing to remap_pfn_range()?
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