FUJITA Tomonori wrote: > 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. That function takes the wrong argument in a VCM world: unsigned long dma_get_seg_boundary(struct device *dev); The boundary should be an attribute of the device side mapping, independent of the device. This would allow better code reuse. -- Sent by an employee of the Qualcomm Innovation Center, Inc. The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum. -- 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>