diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h
index 24e0f48..ee7ef99 100644
--- a/include/linux/dma-buf.h
+++ b/include/linux/dma-buf.h
@@ -50,6 +50,17 @@
  * @unmap_dma_buf: decreases usecount of buffer, might deallocate scatter
  *		   pages.
  * @release: release this buffer; to be called after the last dma_buf_put.
+ * @begin_cpu_access: [optional] called before cpu access to invalidate cpu
+ * 		      caches and allocate backing storage (if not yet done)
+ * 		      respectively pin the objet into memory.
+ * @end_cpu_access: [optional] called after cpu access to flush cashes.
+ * @kmap_atomic: maps a page from the buffer into kernel address
+ * 		 space, users may not block until the subsequent unmap call.
+ * 		 This callback must not sleep.
+ * @kunmap_atomic: [optional] unmaps a atomically mapped page from the buffer.
+ * 		   This Callback must not sleep.
+ * @kmap: maps a page from the buffer into kernel address space.
+ * @kunmap: [optional] unmaps a page from the buffer.
  */
 struct dma_buf_ops {
 	int (*attach)(struct dma_buf *, struct device *,
@@ -73,6 +84,14 @@
 	/* after final dma_buf_put() */
 	void (*release)(struct dma_buf *);
 
+	int (*begin_cpu_access)(struct dma_buf *, size_t, size_t,
+				enum dma_data_direction);
+	void (*end_cpu_access)(struct dma_buf *, size_t, size_t,
+			       enum dma_data_direction);
+	void *(*kmap_atomic)(struct dma_buf *, unsigned long);
+	void (*kunmap_atomic)(struct dma_buf *, unsigned long, void *);
+	void *(*kmap)(struct dma_buf *, unsigned long);
+	void (*kunmap)(struct dma_buf *, unsigned long, void *);
 };
 
 /**
@@ -140,6 +159,14 @@
 					enum dma_data_direction);
 void dma_buf_unmap_attachment(struct dma_buf_attachment *, struct sg_table *,
 				enum dma_data_direction);
+int dma_buf_begin_cpu_access(struct dma_buf *dma_buf, size_t start, size_t len,
+			     enum dma_data_direction dir);
+void dma_buf_end_cpu_access(struct dma_buf *dma_buf, size_t start, size_t len,
+			    enum dma_data_direction dir);
+void *dma_buf_kmap_atomic(struct dma_buf *, unsigned long);
+void dma_buf_kunmap_atomic(struct dma_buf *, unsigned long, void *);
+void *dma_buf_kmap(struct dma_buf *, unsigned long);
+void dma_buf_kunmap(struct dma_buf *, unsigned long, void *);
 #else
 
 static inline struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf,
@@ -188,6 +215,38 @@
 	return;
 }
 
+static inline int dma_buf_begin_cpu_access(struct dma_buf *,
+					   size_t, size_t,
+					   enum dma_data_direction)
+{
+	return -ENODEV;
+}
+
+static inline void dma_buf_end_cpu_access(struct dma_buf *,
+					  size_t, size_t,
+					  enum dma_data_direction)
+{
+}
+
+static inline void *dma_buf_kmap_atomic(struct dma_buf *, unsigned long)
+{
+	return NULL;
+}
+
+static inline void dma_buf_kunmap_atomic(struct dma_buf *, unsigned long,
+					 void *)
+{
+}
+
+static inline void *dma_buf_kmap(struct dma_buf *, unsigned long)
+{
+	return NULL;
+}
+
+static inline void dma_buf_kunmap(struct dma_buf *, unsigned long,
+				  void *)
+{
+}
 #endif /* CONFIG_DMA_SHARED_BUFFER */
 
 #endif /* __DMA_BUF_H__ */