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caab277b | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
d15bd7ee SS |
2 | /* |
3 | * Header file for dma buffer sharing framework. | |
4 | * | |
5 | * Copyright(C) 2011 Linaro Limited. All rights reserved. | |
6 | * Author: Sumit Semwal <sumit.semwal@ti.com> | |
7 | * | |
8 | * Many thanks to linaro-mm-sig list, and specially | |
9 | * Arnd Bergmann <arnd@arndb.de>, Rob Clark <rob@ti.com> and | |
10 | * Daniel Vetter <daniel@ffwll.ch> for their support in creation and | |
11 | * refining of this idea. | |
d15bd7ee SS |
12 | */ |
13 | #ifndef __DMA_BUF_H__ | |
14 | #define __DMA_BUF_H__ | |
15 | ||
16 | #include <linux/file.h> | |
17 | #include <linux/err.h> | |
d15bd7ee SS |
18 | #include <linux/scatterlist.h> |
19 | #include <linux/list.h> | |
20 | #include <linux/dma-mapping.h> | |
f9a24d1a | 21 | #include <linux/fs.h> |
f54d1867 | 22 | #include <linux/dma-fence.h> |
9b495a58 | 23 | #include <linux/wait.h> |
d15bd7ee | 24 | |
313162d0 | 25 | struct device; |
d15bd7ee SS |
26 | struct dma_buf; |
27 | struct dma_buf_attachment; | |
28 | ||
29 | /** | |
30 | * struct dma_buf_ops - operations possible on struct dma_buf | |
12c4727e SS |
31 | * @vmap: [optional] creates a virtual mapping for the buffer into kernel |
32 | * address space. Same restrictions as for vmap and friends apply. | |
33 | * @vunmap: [optional] unmaps a vmap from the buffer | |
d15bd7ee SS |
34 | */ |
35 | struct dma_buf_ops { | |
f13e143e CK |
36 | /** |
37 | * @cache_sgt_mapping: | |
38 | * | |
39 | * If true the framework will cache the first mapping made for each | |
40 | * attachment. This avoids creating mappings for attachments multiple | |
41 | * times. | |
42 | */ | |
43 | bool cache_sgt_mapping; | |
44 | ||
2904a8c1 DV |
45 | /** |
46 | * @attach: | |
47 | * | |
48 | * This is called from dma_buf_attach() to make sure that a given | |
a19741e5 CK |
49 | * &dma_buf_attachment.dev can access the provided &dma_buf. Exporters |
50 | * which support buffer objects in special locations like VRAM or | |
51 | * device-specific carveout areas should check whether the buffer could | |
52 | * be move to system memory (or directly accessed by the provided | |
53 | * device), and otherwise need to fail the attach operation. | |
2904a8c1 DV |
54 | * |
55 | * The exporter should also in general check whether the current | |
56 | * allocation fullfills the DMA constraints of the new device. If this | |
57 | * is not the case, and the allocation cannot be moved, it should also | |
58 | * fail the attach operation. | |
59 | * | |
e9b4d7b5 DV |
60 | * Any exporter-private housekeeping data can be stored in the |
61 | * &dma_buf_attachment.priv pointer. | |
2904a8c1 DV |
62 | * |
63 | * This callback is optional. | |
64 | * | |
65 | * Returns: | |
66 | * | |
67 | * 0 on success, negative error code on failure. It might return -EBUSY | |
68 | * to signal that backing storage is already allocated and incompatible | |
69 | * with the requirements of requesting device. | |
70 | */ | |
a19741e5 | 71 | int (*attach)(struct dma_buf *, struct dma_buf_attachment *); |
d15bd7ee | 72 | |
2904a8c1 DV |
73 | /** |
74 | * @detach: | |
75 | * | |
76 | * This is called by dma_buf_detach() to release a &dma_buf_attachment. | |
77 | * Provided so that exporters can clean up any housekeeping for an | |
78 | * &dma_buf_attachment. | |
79 | * | |
80 | * This callback is optional. | |
81 | */ | |
d15bd7ee SS |
82 | void (*detach)(struct dma_buf *, struct dma_buf_attachment *); |
83 | ||
bb42df46 CK |
84 | /** |
85 | * @pin: | |
86 | * | |
87 | * This is called by dma_buf_pin and lets the exporter know that the | |
88 | * DMA-buf can't be moved any more. | |
89 | * | |
bd2275ee CK |
90 | * This is called with the dmabuf->resv object locked and is mutual |
91 | * exclusive with @cache_sgt_mapping. | |
bb42df46 CK |
92 | * |
93 | * This callback is optional and should only be used in limited use | |
94 | * cases like scanout and not for temporary pin operations. | |
95 | * | |
96 | * Returns: | |
97 | * | |
98 | * 0 on success, negative error code on failure. | |
99 | */ | |
100 | int (*pin)(struct dma_buf_attachment *attach); | |
101 | ||
102 | /** | |
103 | * @unpin: | |
104 | * | |
105 | * This is called by dma_buf_unpin and lets the exporter know that the | |
106 | * DMA-buf can be moved again. | |
107 | * | |
bd2275ee CK |
108 | * This is called with the dmabuf->resv object locked and is mutual |
109 | * exclusive with @cache_sgt_mapping. | |
bb42df46 CK |
110 | * |
111 | * This callback is optional. | |
112 | */ | |
113 | void (*unpin)(struct dma_buf_attachment *attach); | |
114 | ||
2904a8c1 DV |
115 | /** |
116 | * @map_dma_buf: | |
117 | * | |
118 | * This is called by dma_buf_map_attachment() and is used to map a | |
119 | * shared &dma_buf into device address space, and it is mandatory. It | |
bb42df46 | 120 | * can only be called if @attach has been called successfully. |
2904a8c1 DV |
121 | * |
122 | * This call may sleep, e.g. when the backing storage first needs to be | |
123 | * allocated, or moved to a location suitable for all currently attached | |
124 | * devices. | |
125 | * | |
126 | * Note that any specific buffer attributes required for this function | |
127 | * should get added to device_dma_parameters accessible via | |
e9b4d7b5 | 128 | * &device.dma_params from the &dma_buf_attachment. The @attach callback |
2904a8c1 DV |
129 | * should also check these constraints. |
130 | * | |
131 | * If this is being called for the first time, the exporter can now | |
132 | * choose to scan through the list of attachments for this buffer, | |
133 | * collate the requirements of the attached devices, and choose an | |
134 | * appropriate backing storage for the buffer. | |
135 | * | |
136 | * Based on enum dma_data_direction, it might be possible to have | |
137 | * multiple users accessing at the same time (for reading, maybe), or | |
138 | * any other kind of sharing that the exporter might wish to make | |
139 | * available to buffer-users. | |
140 | * | |
15fd552d CK |
141 | * This is always called with the dmabuf->resv object locked when |
142 | * the dynamic_mapping flag is true. | |
143 | * | |
2904a8c1 DV |
144 | * Returns: |
145 | * | |
146 | * A &sg_table scatter list of or the backing storage of the DMA buffer, | |
147 | * already mapped into the device address space of the &device attached | |
148 | * with the provided &dma_buf_attachment. | |
149 | * | |
150 | * On failure, returns a negative error value wrapped into a pointer. | |
151 | * May also return -EINTR when a signal was received while being | |
152 | * blocked. | |
d15bd7ee SS |
153 | */ |
154 | struct sg_table * (*map_dma_buf)(struct dma_buf_attachment *, | |
2904a8c1 DV |
155 | enum dma_data_direction); |
156 | /** | |
157 | * @unmap_dma_buf: | |
158 | * | |
159 | * This is called by dma_buf_unmap_attachment() and should unmap and | |
160 | * release the &sg_table allocated in @map_dma_buf, and it is mandatory. | |
bb42df46 CK |
161 | * For static dma_buf handling this might also unpins the backing |
162 | * storage if this is the last mapping of the DMA buffer. | |
2904a8c1 | 163 | */ |
d15bd7ee | 164 | void (*unmap_dma_buf)(struct dma_buf_attachment *, |
2904a8c1 DV |
165 | struct sg_table *, |
166 | enum dma_data_direction); | |
167 | ||
d15bd7ee SS |
168 | /* TODO: Add try_map_dma_buf version, to return immed with -EBUSY |
169 | * if the call would block. | |
170 | */ | |
171 | ||
2904a8c1 DV |
172 | /** |
173 | * @release: | |
174 | * | |
175 | * Called after the last dma_buf_put to release the &dma_buf, and | |
176 | * mandatory. | |
177 | */ | |
d15bd7ee SS |
178 | void (*release)(struct dma_buf *); |
179 | ||
0959a168 DV |
180 | /** |
181 | * @begin_cpu_access: | |
182 | * | |
183 | * This is called from dma_buf_begin_cpu_access() and allows the | |
184 | * exporter to ensure that the memory is actually available for cpu | |
185 | * access - the exporter might need to allocate or swap-in and pin the | |
186 | * backing storage. The exporter also needs to ensure that cpu access is | |
187 | * coherent for the access direction. The direction can be used by the | |
188 | * exporter to optimize the cache flushing, i.e. access with a different | |
189 | * direction (read instead of write) might return stale or even bogus | |
190 | * data (e.g. when the exporter needs to copy the data to temporary | |
191 | * storage). | |
192 | * | |
193 | * This callback is optional. | |
194 | * | |
195 | * FIXME: This is both called through the DMA_BUF_IOCTL_SYNC command | |
196 | * from userspace (where storage shouldn't be pinned to avoid handing | |
197 | * de-factor mlock rights to userspace) and for the kernel-internal | |
198 | * users of the various kmap interfaces, where the backing storage must | |
199 | * be pinned to guarantee that the atomic kmap calls can succeed. Since | |
200 | * there's no in-kernel users of the kmap interfaces yet this isn't a | |
201 | * real problem. | |
202 | * | |
203 | * Returns: | |
204 | * | |
205 | * 0 on success or a negative error code on failure. This can for | |
206 | * example fail when the backing storage can't be allocated. Can also | |
207 | * return -ERESTARTSYS or -EINTR when the call has been interrupted and | |
208 | * needs to be restarted. | |
209 | */ | |
831e9da7 | 210 | int (*begin_cpu_access)(struct dma_buf *, enum dma_data_direction); |
0959a168 DV |
211 | |
212 | /** | |
213 | * @end_cpu_access: | |
214 | * | |
215 | * This is called from dma_buf_end_cpu_access() when the importer is | |
216 | * done accessing the CPU. The exporter can use this to flush caches and | |
217 | * unpin any resources pinned in @begin_cpu_access. | |
218 | * The result of any dma_buf kmap calls after end_cpu_access is | |
219 | * undefined. | |
220 | * | |
221 | * This callback is optional. | |
222 | * | |
223 | * Returns: | |
224 | * | |
225 | * 0 on success or a negative error code on failure. Can return | |
226 | * -ERESTARTSYS or -EINTR when the call has been interrupted and needs | |
227 | * to be restarted. | |
228 | */ | |
18b862dc | 229 | int (*end_cpu_access)(struct dma_buf *, enum dma_data_direction); |
4c78513e | 230 | |
0959a168 DV |
231 | /** |
232 | * @mmap: | |
233 | * | |
234 | * This callback is used by the dma_buf_mmap() function | |
235 | * | |
236 | * Note that the mapping needs to be incoherent, userspace is expected | |
237 | * to braket CPU access using the DMA_BUF_IOCTL_SYNC interface. | |
238 | * | |
239 | * Because dma-buf buffers have invariant size over their lifetime, the | |
240 | * dma-buf core checks whether a vma is too large and rejects such | |
241 | * mappings. The exporter hence does not need to duplicate this check. | |
242 | * Drivers do not need to check this themselves. | |
243 | * | |
244 | * If an exporter needs to manually flush caches and hence needs to fake | |
245 | * coherency for mmap support, it needs to be able to zap all the ptes | |
246 | * pointing at the backing storage. Now linux mm needs a struct | |
247 | * address_space associated with the struct file stored in vma->vm_file | |
248 | * to do that with the function unmap_mapping_range. But the dma_buf | |
249 | * framework only backs every dma_buf fd with the anon_file struct file, | |
250 | * i.e. all dma_bufs share the same file. | |
251 | * | |
252 | * Hence exporters need to setup their own file (and address_space) | |
253 | * association by setting vma->vm_file and adjusting vma->vm_pgoff in | |
254 | * the dma_buf mmap callback. In the specific case of a gem driver the | |
255 | * exporter could use the shmem file already provided by gem (and set | |
256 | * vm_pgoff = 0). Exporters can then zap ptes by unmapping the | |
257 | * corresponding range of the struct address_space associated with their | |
258 | * own file. | |
259 | * | |
260 | * This callback is optional. | |
261 | * | |
262 | * Returns: | |
263 | * | |
264 | * 0 on success or a negative error code on failure. | |
265 | */ | |
4c78513e | 266 | int (*mmap)(struct dma_buf *, struct vm_area_struct *vma); |
98f86c9e DA |
267 | |
268 | void *(*vmap)(struct dma_buf *); | |
269 | void (*vunmap)(struct dma_buf *, void *vaddr); | |
d15bd7ee SS |
270 | }; |
271 | ||
272 | /** | |
273 | * struct dma_buf - shared buffer object | |
274 | * @size: size of the buffer | |
275 | * @file: file pointer used for sharing buffers across, and for refcounting. | |
15fd552d CK |
276 | * @attachments: list of dma_buf_attachment that denotes all devices attached, |
277 | * protected by dma_resv lock. | |
d15bd7ee | 278 | * @ops: dma_buf_ops associated with this buffer object. |
bb2bb903 | 279 | * @lock: used internally to serialize list manipulation, attach/detach and |
15fd552d | 280 | * vmap/unmap |
e2082e3a RC |
281 | * @vmapping_counter: used internally to refcnt the vmaps |
282 | * @vmap_ptr: the current vmap ptr if vmapping_counter > 0 | |
78df9695 | 283 | * @exp_name: name of the exporter; useful for debugging. |
15fd552d CK |
284 | * @name: userspace-provided name; useful for accounting and debugging, |
285 | * protected by @resv. | |
9abdffe2 SS |
286 | * @owner: pointer to exporter module; used for refcounting when exporter is a |
287 | * kernel module. | |
b89e3563 | 288 | * @list_node: node for dma_buf accounting and debugging. |
d15bd7ee | 289 | * @priv: exporter specific private data for this buffer object. |
3aac4502 | 290 | * @resv: reservation object linked to this dma-buf |
e2082e3a RC |
291 | * @poll: for userspace poll support |
292 | * @cb_excl: for userspace poll support | |
293 | * @cb_shared: for userspace poll support | |
2904a8c1 DV |
294 | * |
295 | * This represents a shared buffer, created by calling dma_buf_export(). The | |
296 | * userspace representation is a normal file descriptor, which can be created by | |
297 | * calling dma_buf_fd(). | |
298 | * | |
299 | * Shared dma buffers are reference counted using dma_buf_put() and | |
300 | * get_dma_buf(). | |
301 | * | |
f641d3b5 | 302 | * Device DMA access is handled by the separate &struct dma_buf_attachment. |
d15bd7ee SS |
303 | */ |
304 | struct dma_buf { | |
305 | size_t size; | |
306 | struct file *file; | |
307 | struct list_head attachments; | |
308 | const struct dma_buf_ops *ops; | |
d15bd7ee | 309 | struct mutex lock; |
f00b4dad DV |
310 | unsigned vmapping_counter; |
311 | void *vmap_ptr; | |
78df9695 | 312 | const char *exp_name; |
bb2bb903 | 313 | const char *name; |
6348dd29 | 314 | spinlock_t name_lock; /* spinlock to protect name access */ |
9abdffe2 | 315 | struct module *owner; |
b89e3563 | 316 | struct list_head list_node; |
d15bd7ee | 317 | void *priv; |
52791eee | 318 | struct dma_resv *resv; |
9b495a58 ML |
319 | |
320 | /* poll support */ | |
321 | wait_queue_head_t poll; | |
322 | ||
323 | struct dma_buf_poll_cb_t { | |
f54d1867 | 324 | struct dma_fence_cb cb; |
9b495a58 ML |
325 | wait_queue_head_t *poll; |
326 | ||
01e5d556 | 327 | __poll_t active; |
9b495a58 | 328 | } cb_excl, cb_shared; |
d15bd7ee SS |
329 | }; |
330 | ||
bb42df46 CK |
331 | /** |
332 | * struct dma_buf_attach_ops - importer operations for an attachment | |
bb42df46 CK |
333 | * |
334 | * Attachment operations implemented by the importer. | |
335 | */ | |
336 | struct dma_buf_attach_ops { | |
09606b54 CK |
337 | /** |
338 | * @allow_peer2peer: | |
339 | * | |
340 | * If this is set to true the importer must be able to handle peer | |
341 | * resources without struct pages. | |
342 | */ | |
343 | bool allow_peer2peer; | |
344 | ||
bb42df46 | 345 | /** |
6f49c251 | 346 | * @move_notify: [optional] notification that the DMA-buf is moving |
bb42df46 CK |
347 | * |
348 | * If this callback is provided the framework can avoid pinning the | |
349 | * backing store while mappings exists. | |
350 | * | |
351 | * This callback is called with the lock of the reservation object | |
352 | * associated with the dma_buf held and the mapping function must be | |
353 | * called with this lock held as well. This makes sure that no mapping | |
354 | * is created concurrently with an ongoing move operation. | |
355 | * | |
356 | * Mappings stay valid and are not directly affected by this callback. | |
357 | * But the DMA-buf can now be in a different physical location, so all | |
358 | * mappings should be destroyed and re-created as soon as possible. | |
359 | * | |
360 | * New mappings can be created after this callback returns, and will | |
361 | * point to the new location of the DMA-buf. | |
362 | */ | |
363 | void (*move_notify)(struct dma_buf_attachment *attach); | |
364 | }; | |
365 | ||
d15bd7ee SS |
366 | /** |
367 | * struct dma_buf_attachment - holds device-buffer attachment data | |
368 | * @dmabuf: buffer for this attachment. | |
369 | * @dev: device attached to the buffer. | |
15fd552d | 370 | * @node: list of dma_buf_attachment, protected by dma_resv lock of the dmabuf. |
f13e143e CK |
371 | * @sgt: cached mapping. |
372 | * @dir: direction of cached mapping. | |
09606b54 | 373 | * @peer2peer: true if the importer can handle peer resources without pages. |
d15bd7ee | 374 | * @priv: exporter specific attachment data. |
bb42df46 CK |
375 | * @importer_ops: importer operations for this attachment, if provided |
376 | * dma_buf_map/unmap_attachment() must be called with the dma_resv lock held. | |
377 | * @importer_priv: importer specific attachment data. | |
d15bd7ee SS |
378 | * |
379 | * This structure holds the attachment information between the dma_buf buffer | |
380 | * and its user device(s). The list contains one attachment struct per device | |
381 | * attached to the buffer. | |
2904a8c1 DV |
382 | * |
383 | * An attachment is created by calling dma_buf_attach(), and released again by | |
384 | * calling dma_buf_detach(). The DMA mapping itself needed to initiate a | |
385 | * transfer is created by dma_buf_map_attachment() and freed again by calling | |
386 | * dma_buf_unmap_attachment(). | |
d15bd7ee SS |
387 | */ |
388 | struct dma_buf_attachment { | |
389 | struct dma_buf *dmabuf; | |
390 | struct device *dev; | |
391 | struct list_head node; | |
f13e143e CK |
392 | struct sg_table *sgt; |
393 | enum dma_data_direction dir; | |
09606b54 | 394 | bool peer2peer; |
bb42df46 CK |
395 | const struct dma_buf_attach_ops *importer_ops; |
396 | void *importer_priv; | |
d15bd7ee SS |
397 | void *priv; |
398 | }; | |
399 | ||
d8fbe341 SS |
400 | /** |
401 | * struct dma_buf_export_info - holds information needed to export a dma_buf | |
9abdffe2 SS |
402 | * @exp_name: name of the exporter - useful for debugging. |
403 | * @owner: pointer to exporter module - used for refcounting kernel module | |
d8fbe341 SS |
404 | * @ops: Attach allocator-defined dma buf ops to the new buffer |
405 | * @size: Size of the buffer | |
406 | * @flags: mode flags for the file | |
407 | * @resv: reservation-object, NULL to allocate default one | |
408 | * @priv: Attach private data of allocator to this buffer | |
409 | * | |
410 | * This structure holds the information required to export the buffer. Used | |
411 | * with dma_buf_export() only. | |
412 | */ | |
413 | struct dma_buf_export_info { | |
414 | const char *exp_name; | |
9abdffe2 | 415 | struct module *owner; |
d8fbe341 SS |
416 | const struct dma_buf_ops *ops; |
417 | size_t size; | |
418 | int flags; | |
52791eee | 419 | struct dma_resv *resv; |
d8fbe341 SS |
420 | void *priv; |
421 | }; | |
422 | ||
423 | /** | |
2904a8c1 | 424 | * DEFINE_DMA_BUF_EXPORT_INFO - helper macro for exporters |
e2082e3a | 425 | * @name: export-info name |
2904a8c1 | 426 | * |
f641d3b5 | 427 | * DEFINE_DMA_BUF_EXPORT_INFO macro defines the &struct dma_buf_export_info, |
2904a8c1 | 428 | * zeroes it out and pre-populates exp_name in it. |
d8fbe341 | 429 | */ |
e2082e3a RC |
430 | #define DEFINE_DMA_BUF_EXPORT_INFO(name) \ |
431 | struct dma_buf_export_info name = { .exp_name = KBUILD_MODNAME, \ | |
9abdffe2 | 432 | .owner = THIS_MODULE } |
d8fbe341 | 433 | |
f9a24d1a RC |
434 | /** |
435 | * get_dma_buf - convenience wrapper for get_file. | |
436 | * @dmabuf: [in] pointer to dma_buf | |
437 | * | |
438 | * Increments the reference count on the dma-buf, needed in case of drivers | |
439 | * that either need to create additional references to the dmabuf on the | |
440 | * kernel side. For example, an exporter that needs to keep a dmabuf ptr | |
441 | * so that subsequent exports don't create a new dmabuf. | |
442 | */ | |
443 | static inline void get_dma_buf(struct dma_buf *dmabuf) | |
444 | { | |
445 | get_file(dmabuf->file); | |
446 | } | |
447 | ||
15fd552d CK |
448 | /** |
449 | * dma_buf_is_dynamic - check if a DMA-buf uses dynamic mappings. | |
450 | * @dmabuf: the DMA-buf to check | |
451 | * | |
452 | * Returns true if a DMA-buf exporter wants to be called with the dma_resv | |
453 | * locked for the map/unmap callbacks, false if it doesn't wants to be called | |
454 | * with the lock held. | |
455 | */ | |
456 | static inline bool dma_buf_is_dynamic(struct dma_buf *dmabuf) | |
457 | { | |
bd2275ee | 458 | return !!dmabuf->ops->pin; |
15fd552d CK |
459 | } |
460 | ||
461 | /** | |
462 | * dma_buf_attachment_is_dynamic - check if a DMA-buf attachment uses dynamic | |
463 | * mappinsg | |
464 | * @attach: the DMA-buf attachment to check | |
465 | * | |
466 | * Returns true if a DMA-buf importer wants to call the map/unmap functions with | |
467 | * the dma_resv lock held. | |
468 | */ | |
469 | static inline bool | |
470 | dma_buf_attachment_is_dynamic(struct dma_buf_attachment *attach) | |
471 | { | |
bb42df46 | 472 | return !!attach->importer_ops; |
15fd552d CK |
473 | } |
474 | ||
d15bd7ee | 475 | struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf, |
15fd552d CK |
476 | struct device *dev); |
477 | struct dma_buf_attachment * | |
478 | dma_buf_dynamic_attach(struct dma_buf *dmabuf, struct device *dev, | |
bb42df46 CK |
479 | const struct dma_buf_attach_ops *importer_ops, |
480 | void *importer_priv); | |
d15bd7ee | 481 | void dma_buf_detach(struct dma_buf *dmabuf, |
15fd552d | 482 | struct dma_buf_attachment *attach); |
bb42df46 CK |
483 | int dma_buf_pin(struct dma_buf_attachment *attach); |
484 | void dma_buf_unpin(struct dma_buf_attachment *attach); | |
78df9695 | 485 | |
d8fbe341 | 486 | struct dma_buf *dma_buf_export(const struct dma_buf_export_info *exp_info); |
78df9695 | 487 | |
55c1c4ca | 488 | int dma_buf_fd(struct dma_buf *dmabuf, int flags); |
d15bd7ee SS |
489 | struct dma_buf *dma_buf_get(int fd); |
490 | void dma_buf_put(struct dma_buf *dmabuf); | |
491 | ||
492 | struct sg_table *dma_buf_map_attachment(struct dma_buf_attachment *, | |
493 | enum dma_data_direction); | |
33ea2dcb SS |
494 | void dma_buf_unmap_attachment(struct dma_buf_attachment *, struct sg_table *, |
495 | enum dma_data_direction); | |
15fd552d | 496 | void dma_buf_move_notify(struct dma_buf *dma_buf); |
831e9da7 | 497 | int dma_buf_begin_cpu_access(struct dma_buf *dma_buf, |
fc13020e | 498 | enum dma_data_direction dir); |
18b862dc CW |
499 | int dma_buf_end_cpu_access(struct dma_buf *dma_buf, |
500 | enum dma_data_direction dir); | |
4c78513e DV |
501 | |
502 | int dma_buf_mmap(struct dma_buf *, struct vm_area_struct *, | |
503 | unsigned long); | |
98f86c9e DA |
504 | void *dma_buf_vmap(struct dma_buf *); |
505 | void dma_buf_vunmap(struct dma_buf *, void *vaddr); | |
d15bd7ee | 506 | #endif /* __DMA_BUF_H__ */ |