Messages in this thread | | | Date | Wed, 24 Oct 2007 07:33:06 -0400 | From | Jeff Garzik <> | Subject | Re: [PATCH -mm 01/11] add device_dma_parameters structure |
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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@lab.ntt.co.jp> > --- > include/linux/device.h | 11 +++++++++++ > include/linux/dma-mapping.h | 15 +++++++++++++++ > 2 files changed, 26 insertions(+), 0 deletions(-)
ACK
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