diff options
| author | FUJITA Tomonori <tomof@acm.org> | 2008-02-04 22:28:13 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-05 09:44:11 -0800 |
| commit | d22a6966b8029913fac37d078ab2403898d94c63 (patch) | |
| tree | f8bf9155b805781cef04ccb6c8de688ab6ea21e1 /include/linux/dma-mapping.h | |
| parent | 67ec11cf968241c9ae907f8817b6ac74d4dd71d7 (diff) | |
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: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: James Bottomley <James.Bottomley@steeleye.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Cc: Greg KH <greg@kroah.com>
Cc: Jeff Garzik <jeff@garzik.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/dma-mapping.h')
| -rw-r--r-- | include/linux/dma-mapping.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index df3a3610caf..33203070962 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -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 |