1 files changed, 13 insertions, 0 deletions

diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index 347fdc32177a..e13117cbd2f7 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -1,6 +1,7 @@
 #ifndef _LINUX_DMA_MAPPING_H
 #define _LINUX_DMA_MAPPING_H
 
+#include <linux/string.h>
 #include <linux/device.h>
 #include <linux/err.h>
 #include <linux/dma-attrs.h>
@@ -41,6 +42,9 @@ struct dma_map_ops {
         int (*mapping_error)(struct device *dev, dma_addr_t dma_addr);
         int (*dma_supported)(struct device *dev, u64 mask);
         int (*set_dma_mask)(struct device *dev, u64 mask);
+#ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
+        u64 (*get_required_mask)(struct device *dev);
+#endif
         int is_phys;
 };
 
@@ -117,6 +121,15 @@ static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
                 return -EIO;
 }
 
+static inline void *dma_zalloc_coherent(struct device *dev, size_t size,
+                                        dma_addr_t *dma_handle, gfp_t flag)
+{
+        void *ret = dma_alloc_coherent(dev, size, dma_handle, flag);
+        if (ret)
+                memset(ret, 0, size);
+        return ret;
+}
+
 #ifdef CONFIG_HAS_DMA
 static inline int dma_get_cache_alignment(void)
 {