1 files changed, 30 insertions, 0 deletions

diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index 4470950892be..332030709623 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -60,6 +60,36 @@ static inline int is_device_dma_capable(struct device *dev)
 
 extern u64 dma_get_required_mask(struct device *dev);
 
+static inline unsigned int dma_get_max_seg_size(struct device *dev)
+{
+        return dev->dma_parms ? dev->dma_parms->max_segment_size : 65536;
+}
+
+static inline unsigned int dma_set_max_seg_size(struct device *dev,
+                                                unsigned int size)
+{
+        if (dev->dma_parms) {
+                dev->dma_parms->max_segment_size = size;
+                return 0;
+        } else
+                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