On Thu, 08 Jul 2010 16:59:52 -0700 Zach Pfeffer <zpfeffer@xxxxxxxxxxxxxx> wrote: > The problem I'm trying to solve boils down to this: map a set of > contiguous physical buffers to an aligned IOMMU address. I need to > allocate the set of physical buffers in a particular way: use 1 MB > contiguous physical memory, then 64 KB, then 4 KB, etc. and I need to > align the IOMMU address in a particular way. Sounds like the DMA API already supports what you want. You can set segment_boundary_mask in struct device_dma_parameters if you want to align the IOMMU address. See IOMMU implementations that support dma_get_seg_boundary() properly. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>