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-rw-r--r--include/linux/dma-mapping.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index 952e0f8..ba9114e 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -48,6 +48,11 @@ static inline int is_device_dma_capable(struct device *dev)
return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE;
}
+static inline int is_buffer_dma_capable(u64 mask, dma_addr_t addr, size_t size)
+{
+ return addr + size <= mask;
+}
+
#ifdef CONFIG_HAS_DMA
#include <asm/dma-mapping.h>
#else
@@ -58,6 +63,13 @@ static inline int is_device_dma_capable(struct device *dev)
#define dma_sync_single dma_sync_single_for_cpu
#define dma_sync_sg dma_sync_sg_for_cpu
+static inline u64 dma_get_mask(struct device *dev)
+{
+ if (dev && dev->dma_mask && *dev->dma_mask)
+ return *dev->dma_mask;
+ return DMA_32BIT_MASK;
+}
+
extern u64 dma_get_required_mask(struct device *dev);
static inline unsigned int dma_get_max_seg_size(struct device *dev)
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