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 <[email protected]>
---
include/linux/device.h | 11 +++++++++++
include/linux/dma-mapping.h | 15 +++++++++++++++
2 files changed, 26 insertions(+), 0 deletions(-)
ACK
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