Commit d22a6966 authored by FUJITA Tomonori's avatar FUJITA Tomonori Committed by Linus Torvalds

iommu sg merging: add accessors for segment_boundary_mask in device_dma_parameters()

This adds new accessors for segment_boundary_mask in device_dma_parameters
structure in the same way I did for max_segment_size.  So we can easily change
where to place struct device_dma_parameters in the future.

dma_get_segment boundary returns 0xffffffff if dma_parms in struct device
isn't set up properly.  0xffffffff is the default value used in the block
layer and the scsi mid layer.
Signed-off-by: default avatarFUJITA Tomonori <>
Cc: James Bottomley <>
Cc: Jens Axboe <>
Cc: Greg KH <>
Cc: Jeff Garzik <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 67ec11cf
......@@ -75,6 +75,21 @@ static inline unsigned int dma_set_max_seg_size(struct device *dev,
return -EIO;
static inline unsigned long dma_get_seg_boundary(struct device *dev)
return dev->dma_parms ?
dev->dma_parms->segment_boundary_mask : 0xffffffff;
static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
if (dev->dma_parms) {
dev->dma_parms->segment_boundary_mask = mask;
return 0;
} else
return -EIO;
/* flags for the coherent memory api */
#define DMA_MEMORY_MAP 0x01
#define DMA_MEMORY_IO 0x02
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