FUJITA Tomonori wrote:
iommu code merges scatter/gather segments without considering a low level driver's restrictions. The problem is that iommu code can't access to the limitations because they are in request_queue. This patch adds a new structure, device_dma_parameters, including dma information. A pointer to device_dma_parameters is added to struct device. - there are only max_segment_size and segment_boundary_mask there but we'll move more dma stuff in struct device (like dma_mask) to struct device_dma_parameters later. segment_boundary_mask is not supported yet. - new accessors for the dma parameters are added. So we can easily change where to place struct device_dma_parameters in the future. - dma_get_max_seg_size returns 64K if dma_parms in struct device isn't set up properly. 64K is the default max_segment_size in the block layer. Signed-off-by: FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx> --- include/linux/device.h | 11 +++++++++++ include/linux/dma-mapping.h | 15 +++++++++++++++ 2 files changed, 26 insertions(+), 0 deletions(-)
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