WebSVN – Kolibri OS – Diff – /drivers/include/linux/dma-buf.h


/*
 * Header file for dma buffer sharing framework.
 *
 * Copyright(C) 2011 Linaro Limited. All rights reserved.
 * Author: Sumit Semwal 
 *
 * Many thanks to linaro-mm-sig list, and specially
 * Arnd Bergmann , Rob Clark  and
 * Daniel Vetter  for their support in creation and
 * refining of this idea.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see .
 */
#ifndef __DMA_BUF_H__
#define __DMA_BUF_H__
 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
 
struct device;
struct dma_buf;
struct dma_buf_attachment;
 
/**
 * struct dma_buf_ops - operations possible on struct dma_buf
 * @attach: [optional] allows different devices to 'attach' themselves to the
 *	    given buffer. It might return -EBUSY to signal that backing storage
 *	    is already allocated and incompatible with the requirements
 *	    of requesting device.
 * @detach: [optional] detach a given device from this buffer.
 * @map_dma_buf: returns list of scatter pages allocated, increases usecount
 *		 of the buffer. Requires atleast one attach to be called
 *		 before. Returned sg list should already be mapped into
 *		 _device_ address space. This call may sleep. May also return
 *		 -EINTR. Should return -EINVAL if attach hasn't been called yet.
 * @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 caches.
 * @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.
 * @mmap: used to expose the backing storage to userspace. Note that the
 * 	  mapping needs to be coherent - if the exporter doesn't directly
 * 	  support this, it needs to fake coherency by shooting down any ptes
 * 	  when transitioning away from the cpu domain.
 * @vmap: [optional] creates a virtual mapping for the buffer into kernel
 *	  address space. Same restrictions as for vmap and friends apply.
 * @vunmap: [optional] unmaps a vmap from the buffer
 */
struct dma_buf_ops {
	int (*attach)(struct dma_buf *, struct device *,
			struct dma_buf_attachment *);
 
	void (*detach)(struct dma_buf *, struct dma_buf_attachment *);
 
	/* For {map,unmap}_dma_buf below, any specific buffer attributes
	 * required should get added to device_dma_parameters accessible
	 * via dev->dma_params.
	 */
	struct sg_table * (*map_dma_buf)(struct dma_buf_attachment *,
						enum dma_data_direction);
	void (*unmap_dma_buf)(struct dma_buf_attachment *,
						struct sg_table *,
						enum dma_data_direction);
	/* TODO: Add try_map_dma_buf version, to return immed with -EBUSY
	 * if the call would block.
	 */
 
	/* 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 *);
 
	int (*mmap)(struct dma_buf *, struct vm_area_struct *vma);
 
	void *(*vmap)(struct dma_buf *);
	void (*vunmap)(struct dma_buf *, void *vaddr);
};
 
/**
 * struct dma_buf - shared buffer object
 * @size: size of the buffer
 * @file: file pointer used for sharing buffers across, and for refcounting.
 * @attachments: list of dma_buf_attachment that denotes all devices attached.
 * @ops: dma_buf_ops associated with this buffer object.
 * @exp_name: name of the exporter; useful for debugging.
 * @owner: pointer to exporter module; used for refcounting when exporter is a
 *         kernel module.
 * @list_node: node for dma_buf accounting and debugging.
 * @priv: exporter specific private data for this buffer object.
 * @resv: reservation object linked to this dma-buf
 */
struct dma_buf {
	size_t size;
	struct file *file;
	struct list_head attachments;
	const struct dma_buf_ops *ops;
	/* mutex to serialize list manipulation, attach/detach and vmap/unmap */
	struct mutex lock;
	unsigned vmapping_counter;
	void *vmap_ptr;
	const char *exp_name;
	struct list_head list_node;
	void *priv;
};
 
/**
 * struct dma_buf_attachment - holds device-buffer attachment data
 * @dmabuf: buffer for this attachment.
 * @dev: device attached to the buffer.
 * @node: list of dma_buf_attachment.
 * @priv: exporter specific attachment data.
 *
 * This structure holds the attachment information between the dma_buf buffer
 * and its user device(s). The list contains one attachment struct per device
 * attached to the buffer.
 */
struct dma_buf_attachment {
	struct dma_buf *dmabuf;
	struct device *dev;
	struct list_head node;
	void *priv;
};
 
/**
 * struct dma_buf_export_info - holds information needed to export a dma_buf
 * @exp_name:	name of the exporter - useful for debugging.
 * @owner:	pointer to exporter module - used for refcounting kernel module
 * @ops:	Attach allocator-defined dma buf ops to the new buffer
 * @size:	Size of the buffer
 * @flags:	mode flags for the file
 * @resv:	reservation-object, NULL to allocate default one
 * @priv:	Attach private data of allocator to this buffer
 *
 * This structure holds the information required to export the buffer. Used
 * with dma_buf_export() only.
 */
struct dma_buf_export_info {
	const char *exp_name;
	struct module *owner;
	const struct dma_buf_ops *ops;
	size_t size;
	int flags;
	struct reservation_object *resv;
	void *priv;
};
 
/**
 * helper macro for exporters; zeros and fills in most common values
 */
#define DEFINE_DMA_BUF_EXPORT_INFO(a)	\
	struct dma_buf_export_info a = { .exp_name = KBUILD_MODNAME, \
					 .owner = THIS_MODULE }
 
/**
 * get_dma_buf - convenience wrapper for get_file.
 * @dmabuf:	[in]	pointer to dma_buf
 *
 * Increments the reference count on the dma-buf, needed in case of drivers
 * that either need to create additional references to the dmabuf on the
 * kernel side.  For example, an exporter that needs to keep a dmabuf ptr
 * so that subsequent exports don't create a new dmabuf.
 */
static inline void get_dma_buf(struct dma_buf *dmabuf)
{
	get_file(dmabuf->file);
}
 
struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf,
							struct device *dev);
void dma_buf_detach(struct dma_buf *dmabuf,
				struct dma_buf_attachment *dmabuf_attach);
 
struct dma_buf *dma_buf_export(const struct dma_buf_export_info *exp_info);
 
int dma_buf_fd(struct dma_buf *dmabuf, int flags);
struct dma_buf *dma_buf_get(int fd);
void dma_buf_put(struct dma_buf *dmabuf);
 
struct sg_table *dma_buf_map_attachment(struct dma_buf_attachment *,
					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 *);
 
int dma_buf_mmap(struct dma_buf *, struct vm_area_struct *,
		 unsigned long);
void *dma_buf_vmap(struct dma_buf *);
void dma_buf_vunmap(struct dma_buf *, void *vaddr);
int dma_buf_debugfs_create_file(const char *name,
				int (*write)(struct seq_file *));
#endif /* __DMA_BUF_H__ */

Rev 6082	Rev 6293
1	/*	1	/*
2	* Header file for dma buffer sharing framework.	2	* Header file for dma buffer sharing framework.
3	*	3	*
4	* Copyright(C) 2011 Linaro Limited. All rights reserved.	4	* Copyright(C) 2011 Linaro Limited. All rights reserved.
5	* Author: Sumit Semwal	5	* Author: Sumit Semwal
6	*	6	*
7	* Many thanks to linaro-mm-sig list, and specially	7	* Many thanks to linaro-mm-sig list, and specially
8	* Arnd Bergmann , Rob Clark and	8	* Arnd Bergmann , Rob Clark and
9	* Daniel Vetter for their support in creation and	9	* Daniel Vetter for their support in creation and
10	* refining of this idea.	10	* refining of this idea.
11	*	11	*
12	* This program is free software; you can redistribute it and/or modify it	12	* This program is free software; you can redistribute it and/or modify it
13	* under the terms of the GNU General Public License version 2 as published by	13	* under the terms of the GNU General Public License version 2 as published by
14	* the Free Software Foundation.	14	* the Free Software Foundation.
15	*	15	*
16	* This program is distributed in the hope that it will be useful, but WITHOUT	16	* This program is distributed in the hope that it will be useful, but WITHOUT
17	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or	17	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
18	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for	18	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
19	* more details.	19	* more details.
20	*	20	*
21	* You should have received a copy of the GNU General Public License along with	21	* You should have received a copy of the GNU General Public License along with
22	* this program. If not, see .	22	* this program. If not, see .
23	*/	23	*/
24	#ifndef __DMA_BUF_H__	24	#ifndef __DMA_BUF_H__
25	#define __DMA_BUF_H__	25	#define __DMA_BUF_H__
26		26
27	#include	27	#include
28	#include	28	#include
29	#include	29	#include
30	#include	30	#include
31	#include	31	#include
32	#include	32	#include
33	#include	33	#include
34	#include	34	#include
35		35
36	struct device;	36	struct device;
37	struct dma_buf;	37	struct dma_buf;
38	struct dma_buf_attachment;	38	struct dma_buf_attachment;
39		39
40	/**	40	/**
41	* struct dma_buf_ops - operations possible on struct dma_buf	41	* struct dma_buf_ops - operations possible on struct dma_buf
42	* @attach: [optional] allows different devices to 'attach' themselves to the	42	* @attach: [optional] allows different devices to 'attach' themselves to the
43	* given buffer. It might return -EBUSY to signal that backing storage	43	* given buffer. It might return -EBUSY to signal that backing storage
44	* is already allocated and incompatible with the requirements	44	* is already allocated and incompatible with the requirements
45	* of requesting device.	45	* of requesting device.
46	* @detach: [optional] detach a given device from this buffer.	46	* @detach: [optional] detach a given device from this buffer.
47	* @map_dma_buf: returns list of scatter pages allocated, increases usecount	47	* @map_dma_buf: returns list of scatter pages allocated, increases usecount
48	* of the buffer. Requires atleast one attach to be called	48	* of the buffer. Requires atleast one attach to be called
49	* before. Returned sg list should already be mapped into	49	* before. Returned sg list should already be mapped into
50	* _device_ address space. This call may sleep. May also return	50	* _device_ address space. This call may sleep. May also return
51	* -EINTR. Should return -EINVAL if attach hasn't been called yet.	51	* -EINTR. Should return -EINVAL if attach hasn't been called yet.
52	* @unmap_dma_buf: decreases usecount of buffer, might deallocate scatter	52	* @unmap_dma_buf: decreases usecount of buffer, might deallocate scatter
53	* pages.	53	* pages.
54	* @release: release this buffer; to be called after the last dma_buf_put.	54	* @release: release this buffer; to be called after the last dma_buf_put.
55	* @begin_cpu_access: [optional] called before cpu access to invalidate cpu	55	* @begin_cpu_access: [optional] called before cpu access to invalidate cpu
56	* caches and allocate backing storage (if not yet done)	56	* caches and allocate backing storage (if not yet done)
57	* respectively pin the objet into memory.	57	* respectively pin the objet into memory.
58	* @end_cpu_access: [optional] called after cpu access to flush caches.	58	* @end_cpu_access: [optional] called after cpu access to flush caches.
59	* @kmap_atomic: maps a page from the buffer into kernel address	59	* @kmap_atomic: maps a page from the buffer into kernel address
60	* space, users may not block until the subsequent unmap call.	60	* space, users may not block until the subsequent unmap call.
61	* This callback must not sleep.	61	* This callback must not sleep.
62	* @kunmap_atomic: [optional] unmaps a atomically mapped page from the buffer.	62	* @kunmap_atomic: [optional] unmaps a atomically mapped page from the buffer.
63	* This Callback must not sleep.	63	* This Callback must not sleep.
64	* @kmap: maps a page from the buffer into kernel address space.	64	* @kmap: maps a page from the buffer into kernel address space.
65	* @kunmap: [optional] unmaps a page from the buffer.	65	* @kunmap: [optional] unmaps a page from the buffer.
66	* @mmap: used to expose the backing storage to userspace. Note that the	66	* @mmap: used to expose the backing storage to userspace. Note that the
67	* mapping needs to be coherent - if the exporter doesn't directly	67	* mapping needs to be coherent - if the exporter doesn't directly
68	* support this, it needs to fake coherency by shooting down any ptes	68	* support this, it needs to fake coherency by shooting down any ptes
69	* when transitioning away from the cpu domain.	69	* when transitioning away from the cpu domain.
70	* @vmap: [optional] creates a virtual mapping for the buffer into kernel	70	* @vmap: [optional] creates a virtual mapping for the buffer into kernel
71	* address space. Same restrictions as for vmap and friends apply.	71	* address space. Same restrictions as for vmap and friends apply.
72	* @vunmap: [optional] unmaps a vmap from the buffer	72	* @vunmap: [optional] unmaps a vmap from the buffer
73	*/	73	*/
74	struct dma_buf_ops {	74	struct dma_buf_ops {
75	int (attach)(struct dma_buf , struct device *,	75	int (attach)(struct dma_buf , struct device *,
76	struct dma_buf_attachment *);	76	struct dma_buf_attachment *);
77		77
78	void (detach)(struct dma_buf , struct dma_buf_attachment *);	78	void (detach)(struct dma_buf , struct dma_buf_attachment *);
79		79
80	/* For {map,unmap}_dma_buf below, any specific buffer attributes	80	/* For {map,unmap}_dma_buf below, any specific buffer attributes
81	* required should get added to device_dma_parameters accessible	81	* required should get added to device_dma_parameters accessible
82	* via dev->dma_params.	82	* via dev->dma_params.
83	*/	83	*/
84	struct sg_table * (map_dma_buf)(struct dma_buf_attachment ,	84	struct sg_table * (map_dma_buf)(struct dma_buf_attachment ,
85	enum dma_data_direction);	85	enum dma_data_direction);
86	void (unmap_dma_buf)(struct dma_buf_attachment ,	86	void (unmap_dma_buf)(struct dma_buf_attachment ,
87	struct sg_table *,	87	struct sg_table *,
88	enum dma_data_direction);	88	enum dma_data_direction);
89	/* TODO: Add try_map_dma_buf version, to return immed with -EBUSY	89	/* TODO: Add try_map_dma_buf version, to return immed with -EBUSY
90	* if the call would block.	90	* if the call would block.
91	*/	91	*/
92		92
93	/* after final dma_buf_put() */	93	/* after final dma_buf_put() */
94	void (release)(struct dma_buf );	94	void (release)(struct dma_buf );
95		95
96	int (begin_cpu_access)(struct dma_buf , size_t, size_t,	96	int (begin_cpu_access)(struct dma_buf , size_t, size_t,
97	enum dma_data_direction);	97	enum dma_data_direction);
98	void (end_cpu_access)(struct dma_buf , size_t, size_t,	98	void (end_cpu_access)(struct dma_buf , size_t, size_t,
99	enum dma_data_direction);	99	enum dma_data_direction);
100	void (kmap_atomic)(struct dma_buf *, unsigned long);	100	void (kmap_atomic)(struct dma_buf *, unsigned long);
101	void (kunmap_atomic)(struct dma_buf , unsigned long, void *);	101	void (kunmap_atomic)(struct dma_buf , unsigned long, void *);
102	void (kmap)(struct dma_buf *, unsigned long);	102	void (kmap)(struct dma_buf *, unsigned long);
103	void (kunmap)(struct dma_buf , unsigned long, void *);	103	void (kunmap)(struct dma_buf , unsigned long, void *);
104		104
105	int (mmap)(struct dma_buf , struct vm_area_struct *vma);	105	int (mmap)(struct dma_buf , struct vm_area_struct *vma);
106		106
107	void (vmap)(struct dma_buf *);	107	void (vmap)(struct dma_buf *);
108	void (vunmap)(struct dma_buf , void *vaddr);	108	void (vunmap)(struct dma_buf , void *vaddr);
109	};	109	};
110		110
111	/**	111	/**
112	* struct dma_buf - shared buffer object	112	* struct dma_buf - shared buffer object
113	* @size: size of the buffer	113	* @size: size of the buffer
114	* @file: file pointer used for sharing buffers across, and for refcounting.	114	* @file: file pointer used for sharing buffers across, and for refcounting.
115	* @attachments: list of dma_buf_attachment that denotes all devices attached.	115	* @attachments: list of dma_buf_attachment that denotes all devices attached.
116	* @ops: dma_buf_ops associated with this buffer object.	116	* @ops: dma_buf_ops associated with this buffer object.
117	* @exp_name: name of the exporter; useful for debugging.	117	* @exp_name: name of the exporter; useful for debugging.
118	* @owner: pointer to exporter module; used for refcounting when exporter is a	118	* @owner: pointer to exporter module; used for refcounting when exporter is a
119	* kernel module.	119	* kernel module.
120	* @list_node: node for dma_buf accounting and debugging.	120	* @list_node: node for dma_buf accounting and debugging.
121	* @priv: exporter specific private data for this buffer object.	121	* @priv: exporter specific private data for this buffer object.
122	* @resv: reservation object linked to this dma-buf	122	* @resv: reservation object linked to this dma-buf
123	*/	123	*/
124	struct dma_buf {	124	struct dma_buf {
125	size_t size;	125	size_t size;
126	struct file *file;	126	struct file *file;
127	struct list_head attachments;	127	struct list_head attachments;
128	const struct dma_buf_ops *ops;	128	const struct dma_buf_ops *ops;
129	/* mutex to serialize list manipulation, attach/detach and vmap/unmap */	129	/* mutex to serialize list manipulation, attach/detach and vmap/unmap */
130	struct mutex lock;	130	struct mutex lock;
131	unsigned vmapping_counter;	131	unsigned vmapping_counter;
132	void *vmap_ptr;	132	void *vmap_ptr;
133	const char *exp_name;	133	const char *exp_name;
134	struct list_head list_node;	134	struct list_head list_node;
135	void *priv;	135	void *priv;
136	};	136	};
137		137
138	/**	138	/**
139	* struct dma_buf_attachment - holds device-buffer attachment data	139	* struct dma_buf_attachment - holds device-buffer attachment data
140	* @dmabuf: buffer for this attachment.	140	* @dmabuf: buffer for this attachment.
141	* @dev: device attached to the buffer.	141	* @dev: device attached to the buffer.
142	* @node: list of dma_buf_attachment.	142	* @node: list of dma_buf_attachment.
143	* @priv: exporter specific attachment data.	143	* @priv: exporter specific attachment data.
144	*	144	*
145	* This structure holds the attachment information between the dma_buf buffer	145	* This structure holds the attachment information between the dma_buf buffer
146	* and its user device(s). The list contains one attachment struct per device	146	* and its user device(s). The list contains one attachment struct per device
147	* attached to the buffer.	147	* attached to the buffer.
148	*/	148	*/
149	struct dma_buf_attachment {	149	struct dma_buf_attachment {
150	struct dma_buf *dmabuf;	150	struct dma_buf *dmabuf;
151	struct device *dev;	151	struct device *dev;
152	struct list_head node;	152	struct list_head node;
153	void *priv;	153	void *priv;
154	};	154	};
155		155
156	/**	156	/**
-		157	* struct dma_buf_export_info - holds information needed to export a dma_buf
-		158	* @exp_name: name of the exporter - useful for debugging.
-		159	* @owner: pointer to exporter module - used for refcounting kernel module
-		160	* @ops: Attach allocator-defined dma buf ops to the new buffer
-		161	* @size: Size of the buffer
-		162	* @flags: mode flags for the file
-		163	* @resv: reservation-object, NULL to allocate default one
-		164	* @priv: Attach private data of allocator to this buffer
-		165	*
-		166	* This structure holds the information required to export the buffer. Used
-		167	* with dma_buf_export() only.
-		168	*/
-		169	struct dma_buf_export_info {
-		170	const char *exp_name;
-		171	struct module *owner;
-		172	const struct dma_buf_ops *ops;
-		173	size_t size;
-		174	int flags;
-		175	struct reservation_object *resv;
-		176	void *priv;
-		177	};
-		178
-		179	/**
-		180	* helper macro for exporters; zeros and fills in most common values
-		181	*/
-		182	#define DEFINE_DMA_BUF_EXPORT_INFO(a) \
-		183	struct dma_buf_export_info a = { .exp_name = KBUILD_MODNAME, \
-		184	.owner = THIS_MODULE }
-		185
-		186	/**
157	* get_dma_buf - convenience wrapper for get_file.	187	* get_dma_buf - convenience wrapper for get_file.
158	* @dmabuf: [in] pointer to dma_buf	188	* @dmabuf: [in] pointer to dma_buf
159	*	189	*
160	* Increments the reference count on the dma-buf, needed in case of drivers	190	* Increments the reference count on the dma-buf, needed in case of drivers
161	* that either need to create additional references to the dmabuf on the	191	* that either need to create additional references to the dmabuf on the
162	* kernel side. For example, an exporter that needs to keep a dmabuf ptr	192	* kernel side. For example, an exporter that needs to keep a dmabuf ptr
163	* so that subsequent exports don't create a new dmabuf.	193	* so that subsequent exports don't create a new dmabuf.
164	*/	194	*/
165	static inline void get_dma_buf(struct dma_buf *dmabuf)	195	static inline void get_dma_buf(struct dma_buf *dmabuf)
166	{	196	{
167	get_file(dmabuf->file);	197	get_file(dmabuf->file);
168	}	198	}
169		199
170	struct dma_buf_attachment dma_buf_attach(struct dma_buf dmabuf,	200	struct dma_buf_attachment dma_buf_attach(struct dma_buf dmabuf,
171	struct device *dev);	201	struct device *dev);
172	void dma_buf_detach(struct dma_buf *dmabuf,	202	void dma_buf_detach(struct dma_buf *dmabuf,
173	struct dma_buf_attachment *dmabuf_attach);	203	struct dma_buf_attachment *dmabuf_attach);
174		204
175	struct dma_buf dma_buf_export(const struct dma_buf_export_info exp_info);	205	struct dma_buf dma_buf_export(const struct dma_buf_export_info exp_info);
176		206
177	int dma_buf_fd(struct dma_buf *dmabuf, int flags);	207	int dma_buf_fd(struct dma_buf *dmabuf, int flags);
178	struct dma_buf *dma_buf_get(int fd);	208	struct dma_buf *dma_buf_get(int fd);
179	void dma_buf_put(struct dma_buf *dmabuf);	209	void dma_buf_put(struct dma_buf *dmabuf);
180		210
181	struct sg_table dma_buf_map_attachment(struct dma_buf_attachment ,	211	struct sg_table dma_buf_map_attachment(struct dma_buf_attachment ,
182	enum dma_data_direction);	212	enum dma_data_direction);
183	void dma_buf_unmap_attachment(struct dma_buf_attachment , struct sg_table ,	213	void dma_buf_unmap_attachment(struct dma_buf_attachment , struct sg_table ,
184	enum dma_data_direction);	214	enum dma_data_direction);
185	int dma_buf_begin_cpu_access(struct dma_buf *dma_buf, size_t start, size_t len,	215	int dma_buf_begin_cpu_access(struct dma_buf *dma_buf, size_t start, size_t len,
186	enum dma_data_direction dir);	216	enum dma_data_direction dir);
187	void dma_buf_end_cpu_access(struct dma_buf *dma_buf, size_t start, size_t len,	217	void dma_buf_end_cpu_access(struct dma_buf *dma_buf, size_t start, size_t len,
188	enum dma_data_direction dir);	218	enum dma_data_direction dir);
189	void dma_buf_kmap_atomic(struct dma_buf , unsigned long);	219	void dma_buf_kmap_atomic(struct dma_buf , unsigned long);
190	void dma_buf_kunmap_atomic(struct dma_buf , unsigned long, void );	220	void dma_buf_kunmap_atomic(struct dma_buf , unsigned long, void );
191	void dma_buf_kmap(struct dma_buf , unsigned long);	221	void dma_buf_kmap(struct dma_buf , unsigned long);
192	void dma_buf_kunmap(struct dma_buf , unsigned long, void );	222	void dma_buf_kunmap(struct dma_buf , unsigned long, void );
193		223
194	int dma_buf_mmap(struct dma_buf , struct vm_area_struct ,	224	int dma_buf_mmap(struct dma_buf , struct vm_area_struct ,
195	unsigned long);	225	unsigned long);
196	void dma_buf_vmap(struct dma_buf );	226	void dma_buf_vmap(struct dma_buf );
197	void dma_buf_vunmap(struct dma_buf , void vaddr);	227	void dma_buf_vunmap(struct dma_buf , void vaddr);
198	int dma_buf_debugfs_create_file(const char *name,	228	int dma_buf_debugfs_create_file(const char *name,
199	int (write)(struct seq_file ));	229	int (write)(struct seq_file ));
200	#endif /* __DMA_BUF_H__ */	230	#endif /* __DMA_BUF_H__ */

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(root)/drivers/include/linux/dma-buf.h – Rev 6082 → 6293