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Rev 6293 Rev 7143
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 * @unmap_dma_buf: decreases usecount of buffer, might deallocate scatter
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 * @unmap_dma_buf: decreases usecount of buffer, might deallocate scatter
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 *		   pages.
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 *		   pages.
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 * @release: release this buffer; to be called after the last dma_buf_put.
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 * @release: release this buffer; to be called after the last dma_buf_put.
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 * @begin_cpu_access: [optional] called before cpu access to invalidate cpu
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 * @begin_cpu_access: [optional] called before cpu access to invalidate cpu
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 * 		      caches and allocate backing storage (if not yet done)
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 * 		      caches and allocate backing storage (if not yet done)
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 * 		      respectively pin the objet into memory.
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 * 		      respectively pin the object into memory.
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 * @end_cpu_access: [optional] called after cpu access to flush caches.
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 * @end_cpu_access: [optional] called after cpu access to flush caches.
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 * @kmap_atomic: maps a page from the buffer into kernel address
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 * @kmap_atomic: maps a page from the buffer into kernel address
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 * 		 space, users may not block until the subsequent unmap call.
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 * 		 space, users may not block until the subsequent unmap call.
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 * 		 This callback must not sleep.
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 * 		 This callback must not sleep.
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 * @kunmap_atomic: [optional] unmaps a atomically mapped page from the buffer.
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 * @kunmap_atomic: [optional] unmaps a atomically mapped page from the buffer.
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	 */
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	 */
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	/* after final dma_buf_put() */
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	/* after final dma_buf_put() */
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	void (*release)(struct dma_buf *);
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	void (*release)(struct dma_buf *);
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	int (*begin_cpu_access)(struct dma_buf *, size_t, size_t,
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				enum dma_data_direction);
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	void (*end_cpu_access)(struct dma_buf *, size_t, size_t,
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	int (*begin_cpu_access)(struct dma_buf *, enum dma_data_direction);
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			       enum dma_data_direction);
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	int (*end_cpu_access)(struct dma_buf *, enum dma_data_direction);
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	void *(*kmap_atomic)(struct dma_buf *, unsigned long);
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	void *(*kmap_atomic)(struct dma_buf *, unsigned long);
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	void (*kunmap_atomic)(struct dma_buf *, unsigned long, void *);
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	void (*kunmap_atomic)(struct dma_buf *, unsigned long, void *);
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 * Increments the reference count on the dma-buf, needed in case of drivers
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 * Increments the reference count on the dma-buf, needed in case of drivers
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 * that either need to create additional references to the dmabuf on the
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 * that either need to create additional references to the dmabuf on the
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 * kernel side.  For example, an exporter that needs to keep a dmabuf ptr
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 * kernel side.  For example, an exporter that needs to keep a dmabuf ptr
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 * so that subsequent exports don't create a new dmabuf.
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 * so that subsequent exports don't create a new dmabuf.
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 */
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 */
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static inline void get_dma_buf(struct dma_buf *dmabuf)
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{
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	get_file(dmabuf->file);
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}
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struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf,
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struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf,
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							struct device *dev);
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							struct device *dev);
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void dma_buf_detach(struct dma_buf *dmabuf,
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void dma_buf_detach(struct dma_buf *dmabuf,
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struct sg_table *dma_buf_map_attachment(struct dma_buf_attachment *,
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struct sg_table *dma_buf_map_attachment(struct dma_buf_attachment *,
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					enum dma_data_direction);
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					enum dma_data_direction);
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void dma_buf_unmap_attachment(struct dma_buf_attachment *, struct sg_table *,
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void dma_buf_unmap_attachment(struct dma_buf_attachment *, struct sg_table *,
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				enum dma_data_direction);
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				enum dma_data_direction);
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int dma_buf_begin_cpu_access(struct dma_buf *dma_buf, size_t start, size_t len,
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int dma_buf_begin_cpu_access(struct dma_buf *dma_buf,
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			     enum dma_data_direction dir);
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			     enum dma_data_direction dir);
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void dma_buf_end_cpu_access(struct dma_buf *dma_buf, size_t start, size_t len,
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int dma_buf_end_cpu_access(struct dma_buf *dma_buf,
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			    enum dma_data_direction dir);
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			   enum dma_data_direction dir);
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void *dma_buf_kmap_atomic(struct dma_buf *, unsigned long);
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void *dma_buf_kmap_atomic(struct dma_buf *, unsigned long);
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void dma_buf_kunmap_atomic(struct dma_buf *, unsigned long, void *);
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void dma_buf_kunmap_atomic(struct dma_buf *, unsigned long, void *);
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void *dma_buf_kmap(struct dma_buf *, unsigned long);
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void *dma_buf_kmap(struct dma_buf *, unsigned long);