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. ;) regards, dan carpenter -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
