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e23ccc0a | 1 | /* |
c139990e | 2 | * videobuf2-core.h - Video Buffer 2 Core Framework |
e23ccc0a PO |
3 | * |
4 | * Copyright (C) 2010 Samsung Electronics | |
5 | * | |
95072084 | 6 | * Author: Pawel Osciak <pawel@osciak.com> |
e23ccc0a PO |
7 | * |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation. | |
11 | */ | |
12 | #ifndef _MEDIA_VIDEOBUF2_CORE_H | |
13 | #define _MEDIA_VIDEOBUF2_CORE_H | |
14 | ||
15 | #include <linux/mm_types.h> | |
16 | #include <linux/mutex.h> | |
17 | #include <linux/poll.h> | |
c5384048 | 18 | #include <linux/dma-buf.h> |
37bc2d87 | 19 | #include <linux/bitops.h> |
e23ccc0a | 20 | |
bed04f93 JS |
21 | #define VB2_MAX_FRAME (32) |
22 | #define VB2_MAX_PLANES (8) | |
23 | ||
52839f66 MCC |
24 | /** |
25 | * enum vb2_memory - type of memory model used to make the buffers visible | |
26 | * on userspace. | |
27 | * | |
28 | * @VB2_MEMORY_UNKNOWN: Buffer status is unknown or it is not used yet on | |
29 | * userspace. | |
30 | * @VB2_MEMORY_MMAP: The buffers are allocated by the Kernel and it is | |
31 | * memory mapped via mmap() ioctl. This model is | |
32 | * also used when the user is using the buffers via | |
33 | * read() or write() system calls. | |
34 | * @VB2_MEMORY_USERPTR: The buffers was allocated in userspace and it is | |
35 | * memory mapped via mmap() ioctl. | |
36 | * @VB2_MEMORY_DMABUF: The buffers are passed to userspace via DMA buffer. | |
37 | */ | |
bed04f93 JS |
38 | enum vb2_memory { |
39 | VB2_MEMORY_UNKNOWN = 0, | |
40 | VB2_MEMORY_MMAP = 1, | |
41 | VB2_MEMORY_USERPTR = 2, | |
42 | VB2_MEMORY_DMABUF = 4, | |
43 | }; | |
44 | ||
b25748fe | 45 | struct vb2_fileio_data; |
3415a89f | 46 | struct vb2_threadio_data; |
e23ccc0a PO |
47 | |
48 | /** | |
2b141324 | 49 | * struct vb2_mem_ops - memory handling/memory allocator operations. |
e23ccc0a | 50 | * @alloc: allocate video memory and, optionally, allocator private data, |
0ff657b0 | 51 | * return ERR_PTR() on failure or a pointer to allocator private, |
e23ccc0a | 52 | * per-buffer data on success; the returned private structure |
f286f4df | 53 | * will then be passed as @buf_priv argument to other ops in this |
b6ba2057 HV |
54 | * structure. Additional gfp_flags to use when allocating the |
55 | * are also passed to this operation. These flags are from the | |
56 | * gfp_flags field of vb2_queue. | |
e23ccc0a PO |
57 | * @put: inform the allocator that the buffer will no longer be used; |
58 | * usually will result in the allocator freeing the buffer (if | |
f286f4df | 59 | * no other users of this buffer are present); the @buf_priv |
e23ccc0a | 60 | * argument is the allocator private per-buffer structure |
3f12e6b0 | 61 | * previously returned from the alloc callback. |
32d81b41 MCC |
62 | * @get_dmabuf: acquire userspace memory for a hardware operation; used for |
63 | * DMABUF memory types. | |
e23ccc0a PO |
64 | * @get_userptr: acquire userspace memory for a hardware operation; used for |
65 | * USERPTR memory types; vaddr is the address passed to the | |
66 | * videobuf layer when queuing a video buffer of USERPTR type; | |
67 | * should return an allocator private per-buffer structure | |
0ff657b0 | 68 | * associated with the buffer on success, ERR_PTR() on failure; |
f286f4df | 69 | * the returned private structure will then be passed as @buf_priv |
3f12e6b0 | 70 | * argument to other ops in this structure. |
e23ccc0a | 71 | * @put_userptr: inform the allocator that a USERPTR buffer will no longer |
3f12e6b0 | 72 | * be used. |
60e7926b | 73 | * @attach_dmabuf: attach a shared &struct dma_buf for a hardware operation; |
36c0f8b3 | 74 | * used for DMABUF memory types; dev is the alloc device |
0ff657b0 | 75 | * dbuf is the shared dma_buf; returns ERR_PTR() on failure; |
c5384048 | 76 | * allocator private per-buffer structure on success; |
3f12e6b0 | 77 | * this needs to be used for further accesses to the buffer. |
c5384048 | 78 | * @detach_dmabuf: inform the exporter of the buffer that the current DMABUF |
f286f4df | 79 | * buffer is no longer used; the @buf_priv argument is the |
c5384048 | 80 | * allocator private per-buffer structure previously returned |
3f12e6b0 | 81 | * from the attach_dmabuf callback. |
c5384048 SS |
82 | * @map_dmabuf: request for access to the dmabuf from allocator; the allocator |
83 | * of dmabuf is informed that this driver is going to use the | |
3f12e6b0 | 84 | * dmabuf. |
c5384048 | 85 | * @unmap_dmabuf: releases access control to the dmabuf - allocator is notified |
3f12e6b0 | 86 | * that this driver is done using the dmabuf for now. |
3e0c2f20 | 87 | * @prepare: called every time the buffer is passed from userspace to the |
3f12e6b0 | 88 | * driver, useful for cache synchronisation, optional. |
3e0c2f20 | 89 | * @finish: called every time the buffer is passed back from the driver |
3f12e6b0 | 90 | * to the userspace, also optional. |
e23ccc0a PO |
91 | * @vaddr: return a kernel virtual address to a given memory buffer |
92 | * associated with the passed private structure or NULL if no | |
3f12e6b0 | 93 | * such mapping exists. |
e23ccc0a PO |
94 | * @cookie: return allocator specific cookie for a given memory buffer |
95 | * associated with the passed private structure or NULL if not | |
3f12e6b0 | 96 | * available. |
e23ccc0a PO |
97 | * @num_users: return the current number of users of a memory buffer; |
98 | * return 1 if the videobuf layer (or actually the driver using | |
3f12e6b0 | 99 | * it) is the only user. |
e23ccc0a | 100 | * @mmap: setup a userspace mapping for a given memory buffer under |
3f12e6b0 | 101 | * the provided virtual memory region. |
e23ccc0a | 102 | * |
89cb3ddb MCC |
103 | * Those operations are used by the videobuf2 core to implement the memory |
104 | * handling/memory allocators for each type of supported streaming I/O method. | |
105 | * | |
106 | * .. note:: | |
107 | * #) Required ops for USERPTR types: get_userptr, put_userptr. | |
108 | * | |
109 | * #) Required ops for MMAP types: alloc, put, num_users, mmap. | |
110 | * | |
111 | * #) Required ops for read/write access types: alloc, put, num_users, vaddr. | |
112 | * | |
f286f4df MCC |
113 | * #) Required ops for DMABUF types: attach_dmabuf, detach_dmabuf, |
114 | * map_dmabuf, unmap_dmabuf. | |
e23ccc0a PO |
115 | */ |
116 | struct vb2_mem_ops { | |
00085f1e | 117 | void *(*alloc)(struct device *dev, unsigned long attrs, |
f286f4df MCC |
118 | unsigned long size, |
119 | enum dma_data_direction dma_dir, | |
d935c57e | 120 | gfp_t gfp_flags); |
e23ccc0a | 121 | void (*put)(void *buf_priv); |
ea3aba84 | 122 | struct dma_buf *(*get_dmabuf)(void *buf_priv, unsigned long flags); |
e23ccc0a | 123 | |
36c0f8b3 | 124 | void *(*get_userptr)(struct device *dev, unsigned long vaddr, |
cd474037 HV |
125 | unsigned long size, |
126 | enum dma_data_direction dma_dir); | |
e23ccc0a PO |
127 | void (*put_userptr)(void *buf_priv); |
128 | ||
3e0c2f20 MS |
129 | void (*prepare)(void *buf_priv); |
130 | void (*finish)(void *buf_priv); | |
131 | ||
f286f4df MCC |
132 | void *(*attach_dmabuf)(struct device *dev, |
133 | struct dma_buf *dbuf, | |
cd474037 HV |
134 | unsigned long size, |
135 | enum dma_data_direction dma_dir); | |
c5384048 SS |
136 | void (*detach_dmabuf)(void *buf_priv); |
137 | int (*map_dmabuf)(void *buf_priv); | |
138 | void (*unmap_dmabuf)(void *buf_priv); | |
139 | ||
e23ccc0a PO |
140 | void *(*vaddr)(void *buf_priv); |
141 | void *(*cookie)(void *buf_priv); | |
142 | ||
143 | unsigned int (*num_users)(void *buf_priv); | |
144 | ||
145 | int (*mmap)(void *buf_priv, struct vm_area_struct *vma); | |
146 | }; | |
147 | ||
2d700715 | 148 | /** |
2b141324 MCC |
149 | * struct vb2_plane - plane information. |
150 | * @mem_priv: private data with this plane. | |
151 | * @dbuf: dma_buf - shared buffer object. | |
2d700715 | 152 | * @dbuf_mapped: flag to show whether dbuf is mapped or not |
2b141324 MCC |
153 | * @bytesused: number of bytes occupied by data in the plane (payload). |
154 | * @length: size of this plane (NOT the payload) in bytes. | |
58e1ba3c HV |
155 | * @min_length: minimum required size of this plane (NOT the payload) in bytes. |
156 | * @length is always greater or equal to @min_length. | |
2b141324 | 157 | * @m: Union with memtype-specific data. |
60e7926b MCC |
158 | * @m.offset: when memory in the associated struct vb2_buffer is |
159 | * %VB2_MEMORY_MMAP, equals the offset from the start of | |
2d700715 | 160 | * the device memory for this plane (or is a "cookie" that |
2b141324 | 161 | * should be passed to mmap() called on the video node). |
60e7926b | 162 | * @m.userptr: when memory is %VB2_MEMORY_USERPTR, a userspace pointer |
2b141324 | 163 | * pointing to this plane. |
60e7926b | 164 | * @m.fd: when memory is %VB2_MEMORY_DMABUF, a userspace file |
2b141324 | 165 | * descriptor associated with this plane. |
2d700715 | 166 | * @data_offset: offset in the plane to the start of data; usually 0, |
2b141324 MCC |
167 | * unless there is a header in front of the data. |
168 | * | |
2d700715 | 169 | * Should contain enough information to be able to cover all the fields |
2b141324 | 170 | * of &struct v4l2_plane at videodev2.h. |
2d700715 | 171 | */ |
e23ccc0a PO |
172 | struct vb2_plane { |
173 | void *mem_priv; | |
c5384048 SS |
174 | struct dma_buf *dbuf; |
175 | unsigned int dbuf_mapped; | |
2d700715 JS |
176 | unsigned int bytesused; |
177 | unsigned int length; | |
58e1ba3c | 178 | unsigned int min_length; |
2d700715 JS |
179 | union { |
180 | unsigned int offset; | |
181 | unsigned long userptr; | |
182 | int fd; | |
183 | } m; | |
184 | unsigned int data_offset; | |
e23ccc0a PO |
185 | }; |
186 | ||
187 | /** | |
2b141324 MCC |
188 | * enum vb2_io_modes - queue access methods. |
189 | * @VB2_MMAP: driver supports MMAP with streaming API. | |
190 | * @VB2_USERPTR: driver supports USERPTR with streaming API. | |
191 | * @VB2_READ: driver supports read() style access. | |
192 | * @VB2_WRITE: driver supports write() style access. | |
193 | * @VB2_DMABUF: driver supports DMABUF with streaming API. | |
e23ccc0a PO |
194 | */ |
195 | enum vb2_io_modes { | |
37bc2d87 MCC |
196 | VB2_MMAP = BIT(0), |
197 | VB2_USERPTR = BIT(1), | |
198 | VB2_READ = BIT(2), | |
199 | VB2_WRITE = BIT(3), | |
200 | VB2_DMABUF = BIT(4), | |
e23ccc0a PO |
201 | }; |
202 | ||
e23ccc0a | 203 | /** |
2b141324 MCC |
204 | * enum vb2_buffer_state - current video buffer state. |
205 | * @VB2_BUF_STATE_DEQUEUED: buffer under userspace control. | |
206 | * @VB2_BUF_STATE_PREPARING: buffer is being prepared in videobuf. | |
207 | * @VB2_BUF_STATE_PREPARED: buffer prepared in videobuf and by the driver. | |
208 | * @VB2_BUF_STATE_QUEUED: buffer queued in videobuf, but not in driver. | |
209 | * @VB2_BUF_STATE_REQUEUEING: re-queue a buffer to the driver. | |
e23ccc0a | 210 | * @VB2_BUF_STATE_ACTIVE: buffer queued in driver and possibly used |
2b141324 | 211 | * in a hardware operation. |
e23ccc0a | 212 | * @VB2_BUF_STATE_DONE: buffer returned from driver to videobuf, but |
2b141324 | 213 | * not yet dequeued to userspace. |
e23ccc0a PO |
214 | * @VB2_BUF_STATE_ERROR: same as above, but the operation on the buffer |
215 | * has ended with an error, which will be reported | |
2b141324 | 216 | * to the userspace when it is dequeued. |
e23ccc0a PO |
217 | */ |
218 | enum vb2_buffer_state { | |
219 | VB2_BUF_STATE_DEQUEUED, | |
b18a8ff2 | 220 | VB2_BUF_STATE_PREPARING, |
ebc087d0 | 221 | VB2_BUF_STATE_PREPARED, |
e23ccc0a | 222 | VB2_BUF_STATE_QUEUED, |
6d058c56 | 223 | VB2_BUF_STATE_REQUEUEING, |
e23ccc0a PO |
224 | VB2_BUF_STATE_ACTIVE, |
225 | VB2_BUF_STATE_DONE, | |
226 | VB2_BUF_STATE_ERROR, | |
227 | }; | |
228 | ||
229 | struct vb2_queue; | |
230 | ||
231 | /** | |
2b141324 MCC |
232 | * struct vb2_buffer - represents a video buffer. |
233 | * @vb2_queue: pointer to &struct vb2_queue with the queue to | |
234 | * which this driver belongs. | |
235 | * @index: id number of the buffer. | |
236 | * @type: buffer type. | |
237 | * @memory: the method, in which the actual data is passed. | |
e23ccc0a | 238 | * @num_planes: number of planes in the buffer |
2b141324 MCC |
239 | * on an internal driver queue. |
240 | * @timestamp: frame timestamp in ns. | |
e23ccc0a PO |
241 | */ |
242 | struct vb2_buffer { | |
e23ccc0a | 243 | struct vb2_queue *vb2_queue; |
2d700715 JS |
244 | unsigned int index; |
245 | unsigned int type; | |
246 | unsigned int memory; | |
e23ccc0a | 247 | unsigned int num_planes; |
d6dd645e | 248 | u64 timestamp; |
e23ccc0a | 249 | |
efe98010 MCC |
250 | /* private: internal use only |
251 | * | |
252 | * state: current buffer state; do not change | |
253 | * queued_entry: entry on the queued buffers list, which holds | |
254 | * all buffers queued from userspace | |
255 | * done_entry: entry on the list that stores all buffers ready | |
256 | * to be dequeued to userspace | |
2b141324 | 257 | * vb2_plane: per-plane information; do not change |
efe98010 | 258 | */ |
e23ccc0a PO |
259 | enum vb2_buffer_state state; |
260 | ||
2b141324 | 261 | struct vb2_plane planes[VB2_MAX_PLANES]; |
e23ccc0a PO |
262 | struct list_head queued_entry; |
263 | struct list_head done_entry; | |
b5b4541e HV |
264 | #ifdef CONFIG_VIDEO_ADV_DEBUG |
265 | /* | |
266 | * Counters for how often these buffer-related ops are | |
267 | * called. Used to check for unbalanced ops. | |
268 | */ | |
269 | u32 cnt_mem_alloc; | |
270 | u32 cnt_mem_put; | |
271 | u32 cnt_mem_get_dmabuf; | |
272 | u32 cnt_mem_get_userptr; | |
273 | u32 cnt_mem_put_userptr; | |
274 | u32 cnt_mem_prepare; | |
275 | u32 cnt_mem_finish; | |
276 | u32 cnt_mem_attach_dmabuf; | |
277 | u32 cnt_mem_detach_dmabuf; | |
278 | u32 cnt_mem_map_dmabuf; | |
279 | u32 cnt_mem_unmap_dmabuf; | |
280 | u32 cnt_mem_vaddr; | |
281 | u32 cnt_mem_cookie; | |
282 | u32 cnt_mem_num_users; | |
283 | u32 cnt_mem_mmap; | |
284 | ||
285 | u32 cnt_buf_init; | |
286 | u32 cnt_buf_prepare; | |
287 | u32 cnt_buf_finish; | |
288 | u32 cnt_buf_cleanup; | |
289 | u32 cnt_buf_queue; | |
290 | ||
291 | /* This counts the number of calls to vb2_buffer_done() */ | |
292 | u32 cnt_buf_done; | |
293 | #endif | |
e23ccc0a PO |
294 | }; |
295 | ||
296 | /** | |
2b141324 | 297 | * struct vb2_ops - driver-specific callbacks. |
e23ccc0a | 298 | * |
f286f4df | 299 | * @queue_setup: called from VIDIOC_REQBUFS() and VIDIOC_CREATE_BUFS() |
df9ecb0c HV |
300 | * handlers before memory allocation. It can be called |
301 | * twice: if the original number of requested buffers | |
302 | * could not be allocated, then it will be called a | |
303 | * second time with the actually allocated number of | |
304 | * buffers to verify if that is OK. | |
305 | * The driver should return the required number of buffers | |
89cb3ddb MCC |
306 | * in \*num_buffers, the required number of planes per |
307 | * buffer in \*num_planes, the size of each plane should be | |
564aaf69 MCC |
308 | * set in the sizes\[\] array and optional per-plane |
309 | * allocator specific device in the alloc_devs\[\] array. | |
e5c27ef3 | 310 | * When called from VIDIOC_REQBUFS(), \*num_planes == 0, |
f286f4df | 311 | * the driver has to use the currently configured format to |
89cb3ddb | 312 | * determine the plane sizes and \*num_buffers is the total |
df9ecb0c | 313 | * number of buffers that are being allocated. When called |
e5c27ef3 | 314 | * from VIDIOC_CREATE_BUFS(), \*num_planes != 0 and it |
564aaf69 | 315 | * describes the requested number of planes and sizes\[\] |
e5c27ef3 AL |
316 | * contains the requested plane sizes. In this case |
317 | * \*num_buffers are being allocated additionally to | |
318 | * q->num_buffers. If either \*num_planes or the requested | |
319 | * sizes are invalid callback must return %-EINVAL. | |
e23ccc0a PO |
320 | * @wait_prepare: release any locks taken while calling vb2 functions; |
321 | * it is called before an ioctl needs to wait for a new | |
322 | * buffer to arrive; required to avoid a deadlock in | |
3f12e6b0 | 323 | * blocking access type. |
e23ccc0a PO |
324 | * @wait_finish: reacquire all locks released in the previous callback; |
325 | * required to continue operation after sleeping while | |
3f12e6b0 | 326 | * waiting for a new buffer to arrive. |
e23ccc0a PO |
327 | * @buf_init: called once after allocating a buffer (in MMAP case) |
328 | * or after acquiring a new USERPTR buffer; drivers may | |
329 | * perform additional buffer-related initialization; | |
330 | * initialization failure (return != 0) will prevent | |
3f12e6b0 | 331 | * queue setup from completing successfully; optional. |
2d86401c | 332 | * @buf_prepare: called every time the buffer is queued from userspace |
f286f4df | 333 | * and from the VIDIOC_PREPARE_BUF() ioctl; drivers may |
cf227429 HV |
334 | * perform any initialization required before each |
335 | * hardware operation in this callback; drivers can | |
336 | * access/modify the buffer here as it is still synced for | |
f286f4df | 337 | * the CPU; drivers that support VIDIOC_CREATE_BUFS() must |
cf227429 HV |
338 | * also validate the buffer size; if an error is returned, |
339 | * the buffer will not be queued in driver; optional. | |
e23ccc0a | 340 | * @buf_finish: called before every dequeue of the buffer back to |
cf227429 HV |
341 | * userspace; the buffer is synced for the CPU, so drivers |
342 | * can access/modify the buffer contents; drivers may | |
343 | * perform any operations required before userspace | |
344 | * accesses the buffer; optional. The buffer state can be | |
564aaf69 MCC |
345 | * one of the following: %DONE and %ERROR occur while |
346 | * streaming is in progress, and the %PREPARED state occurs | |
cf227429 | 347 | * when the queue has been canceled and all pending |
564aaf69 | 348 | * buffers are being returned to their default %DEQUEUED |
cf227429 | 349 | * state. Typically you only have to do something if the |
564aaf69 | 350 | * state is %VB2_BUF_STATE_DONE, since in all other cases |
cf227429 | 351 | * the buffer contents will be ignored anyway. |
e23ccc0a | 352 | * @buf_cleanup: called once before the buffer is freed; drivers may |
3f12e6b0 | 353 | * perform any additional cleanup; optional. |
bd323e28 | 354 | * @start_streaming: called once to enter 'streaming' state; the driver may |
564aaf69 MCC |
355 | * receive buffers with @buf_queue callback |
356 | * before @start_streaming is called; the driver gets the | |
357 | * number of already queued buffers in count parameter; | |
358 | * driver can return an error if hardware fails, in that | |
359 | * case all buffers that have been already given by | |
360 | * the @buf_queue callback are to be returned by the driver | |
f286f4df | 361 | * by calling vb2_buffer_done() with %VB2_BUF_STATE_QUEUED. |
ccf58cb4 | 362 | * If you need a minimum number of buffers before you can |
2b141324 MCC |
363 | * start streaming, then set |
364 | * &vb2_queue->min_buffers_needed. If that is non-zero then | |
f286f4df | 365 | * @start_streaming won't be called until at least that |
ccf58cb4 | 366 | * many buffers have been queued up by userspace. |
e23ccc0a PO |
367 | * @stop_streaming: called when 'streaming' state must be disabled; driver |
368 | * should stop any DMA transactions or wait until they | |
564aaf69 | 369 | * finish and give back all buffers it got from &buf_queue |
f286f4df | 370 | * callback by calling vb2_buffer_done() with either |
564aaf69 | 371 | * %VB2_BUF_STATE_DONE or %VB2_BUF_STATE_ERROR; may use |
ccf58cb4 | 372 | * vb2_wait_for_all_buffers() function |
e23ccc0a PO |
373 | * @buf_queue: passes buffer vb to the driver; driver may start |
374 | * hardware operation on this buffer; driver should give | |
bd323e28 | 375 | * the buffer back by calling vb2_buffer_done() function; |
f286f4df MCC |
376 | * it is allways called after calling VIDIOC_STREAMON() |
377 | * ioctl; might be called before @start_streaming callback | |
378 | * if user pre-queued buffers before calling | |
379 | * VIDIOC_STREAMON(). | |
e23ccc0a PO |
380 | */ |
381 | struct vb2_ops { | |
df9ecb0c | 382 | int (*queue_setup)(struct vb2_queue *q, |
fc714e70 | 383 | unsigned int *num_buffers, unsigned int *num_planes, |
36c0f8b3 | 384 | unsigned int sizes[], struct device *alloc_devs[]); |
e23ccc0a PO |
385 | |
386 | void (*wait_prepare)(struct vb2_queue *q); | |
387 | void (*wait_finish)(struct vb2_queue *q); | |
388 | ||
389 | int (*buf_init)(struct vb2_buffer *vb); | |
390 | int (*buf_prepare)(struct vb2_buffer *vb); | |
06470642 | 391 | void (*buf_finish)(struct vb2_buffer *vb); |
e23ccc0a PO |
392 | void (*buf_cleanup)(struct vb2_buffer *vb); |
393 | ||
bd323e28 | 394 | int (*start_streaming)(struct vb2_queue *q, unsigned int count); |
e37559b2 | 395 | void (*stop_streaming)(struct vb2_queue *q); |
e23ccc0a PO |
396 | |
397 | void (*buf_queue)(struct vb2_buffer *vb); | |
398 | }; | |
399 | ||
10cc3b1e | 400 | /** |
2b141324 | 401 | * struct vb2_buf_ops - driver-specific callbacks. |
10cc3b1e | 402 | * |
e7e0c3e2 SA |
403 | * @verify_planes_array: Verify that a given user space structure contains |
404 | * enough planes for the buffer. This is called | |
405 | * for each dequeued buffer. | |
60e7926b | 406 | * @fill_user_buffer: given a &vb2_buffer fill in the userspace structure. |
2b141324 | 407 | * For V4L2 this is a &struct v4l2_buffer. |
60e7926b | 408 | * @fill_vb2_buffer: given a userspace structure, fill in the &vb2_buffer. |
10cc3b1e HV |
409 | * If the userspace structure is invalid, then this op |
410 | * will return an error. | |
411 | * @copy_timestamp: copy the timestamp from a userspace structure to | |
2b141324 | 412 | * the &struct vb2_buffer. |
10cc3b1e | 413 | */ |
b0e0e1f8 | 414 | struct vb2_buf_ops { |
e7e0c3e2 | 415 | int (*verify_planes_array)(struct vb2_buffer *vb, const void *pb); |
10cc3b1e | 416 | void (*fill_user_buffer)(struct vb2_buffer *vb, void *pb); |
b0e0e1f8 JS |
417 | int (*fill_vb2_buffer)(struct vb2_buffer *vb, const void *pb, |
418 | struct vb2_plane *planes); | |
10cc3b1e | 419 | void (*copy_timestamp)(struct vb2_buffer *vb, const void *pb); |
b0e0e1f8 | 420 | }; |
5a5adf6b | 421 | |
e23ccc0a | 422 | /** |
2b141324 | 423 | * struct vb2_queue - a videobuf queue. |
e23ccc0a | 424 | * |
bed04f93 JS |
425 | * @type: private buffer type whose content is defined by the vb2-core |
426 | * caller. For example, for V4L2, it should match | |
2b141324 MCC |
427 | * the types defined on &enum v4l2_buf_type. |
428 | * @io_modes: supported io methods (see &enum vb2_io_modes). | |
429 | * @alloc_devs: &struct device memory type/allocator-specific per-plane device | |
20be7ab8 | 430 | * @dev: device to use for the default allocation context if the driver |
36c0f8b3 | 431 | * doesn't fill in the @alloc_devs array. |
00085f1e | 432 | * @dma_attrs: DMA attributes to use for the DMA. |
5b6f9abe | 433 | * @bidirectional: when this flag is set the DMA direction for the buffers of |
60e7926b | 434 | * this queue will be overridden with %DMA_BIDIRECTIONAL direction. |
5b6f9abe | 435 | * This is useful in cases where the hardware (firmware) writes to |
60e7926b MCC |
436 | * a buffer which is mapped as read (%DMA_TO_DEVICE), or reads from |
437 | * buffer which is mapped for write (%DMA_FROM_DEVICE) in order | |
5b6f9abe SV |
438 | * to satisfy some internal hardware restrictions or adds a padding |
439 | * needed by the processing algorithm. In case the DMA mapping is | |
440 | * not bidirectional but the hardware (firmware) trying to access | |
441 | * the buffer (in the opposite direction) this could lead to an | |
442 | * IOMMU protection faults. | |
06e7a9b6 KD |
443 | * @fileio_read_once: report EOF after reading the first buffer |
444 | * @fileio_write_immediately: queue buffer after each write() call | |
f61bf13b | 445 | * @allow_zero_bytesused: allow bytesused == 0 to be passed to the driver |
a9a08845 | 446 | * @quirk_poll_must_check_waiting_for_buffers: Return %EPOLLERR at poll when QBUF |
b9387684 RRD |
447 | * has not been called. This is a vb1 idiom that has been adopted |
448 | * also by vb2. | |
2b141324 | 449 | * @lock: pointer to a mutex that protects the &struct vb2_queue. The |
5a5adf6b HV |
450 | * driver can set this to a mutex to let the v4l2 core serialize |
451 | * the queuing ioctls. If the driver wants to handle locking | |
452 | * itself, then this should be set to NULL. This lock is not used | |
453 | * by the videobuf2 core API. | |
454 | * @owner: The filehandle that 'owns' the buffers, i.e. the filehandle | |
455 | * that called reqbufs, create_buffers or started fileio. | |
456 | * This field is not used by the videobuf2 core API, but it allows | |
457 | * drivers to easily associate an owner filehandle with the queue. | |
e23ccc0a PO |
458 | * @ops: driver-specific callbacks |
459 | * @mem_ops: memory allocator specific callbacks | |
2b141324 MCC |
460 | * @buf_ops: callbacks to deliver buffer information. |
461 | * between user-space and kernel-space. | |
462 | * @drv_priv: driver private data. | |
e23ccc0a PO |
463 | * @buf_struct_size: size of the driver-specific buffer structure; |
464 | * "0" indicates the driver doesn't want to use a custom buffer | |
2b141324 | 465 | * structure type. for example, ``sizeof(struct vb2_v4l2_buffer)`` |
2d700715 | 466 | * will be used for v4l2. |
2b141324 MCC |
467 | * @timestamp_flags: Timestamp flags; ``V4L2_BUF_FLAG_TIMESTAMP_*`` and |
468 | * ``V4L2_BUF_FLAG_TSTAMP_SRC_*`` | |
b6ba2057 | 469 | * @gfp_flags: additional gfp flags used when allocating the buffers. |
60e7926b | 470 | * Typically this is 0, but it may be e.g. %GFP_DMA or %__GFP_DMA32 |
b6ba2057 | 471 | * to force the buffer allocation to a specific memory zone. |
b3379c62 | 472 | * @min_buffers_needed: the minimum number of buffers needed before |
f286f4df | 473 | * @start_streaming can be called. Used when a DMA engine |
b3379c62 HV |
474 | * cannot be started unless at least this number of buffers |
475 | * have been queued into the driver. | |
d78757e7 MCC |
476 | */ |
477 | /* | |
f286f4df | 478 | * Private elements (won't appear at the uAPI book): |
f035eb4e | 479 | * @mmap_lock: private mutex used when buffers are allocated/freed/mmapped |
e23ccc0a | 480 | * @memory: current memory type used |
5b6f9abe | 481 | * @dma_dir: DMA mapping direction. |
e23ccc0a PO |
482 | * @bufs: videobuf buffer structures |
483 | * @num_buffers: number of allocated/used buffers | |
484 | * @queued_list: list of buffers currently queued from userspace | |
b3379c62 | 485 | * @queued_count: number of buffers queued and ready for streaming. |
6ea3b980 | 486 | * @owned_by_drv_count: number of buffers owned by the driver |
e23ccc0a PO |
487 | * @done_list: list of buffers ready to be dequeued to userspace |
488 | * @done_lock: lock to protect done_list list | |
489 | * @done_wq: waitqueue for processes waiting for buffers ready to be dequeued | |
e23ccc0a | 490 | * @streaming: current streaming state |
f286f4df | 491 | * @start_streaming_called: @start_streaming was called successfully and we |
b3379c62 | 492 | * started streaming. |
4bb7267d | 493 | * @error: a fatal error occurred on the queue |
58d75f4b HV |
494 | * @waiting_for_buffers: used in poll() to check if vb2 is still waiting for |
495 | * buffers. Only set for capture queues if qbuf has not yet been | |
a9a08845 | 496 | * called since poll() needs to return %EPOLLERR in that situation. |
bed04f93 JS |
497 | * @is_multiplanar: set if buffer type is multiplanar |
498 | * @is_output: set if buffer type is output | |
959c3ef3 | 499 | * @copy_timestamp: set if vb2-core should set timestamps |
c1621840 PZ |
500 | * @last_buffer_dequeued: used in poll() and DQBUF to immediately return if the |
501 | * last decoded buffer was already dequeued. Set for capture queues | |
60e7926b | 502 | * when a buffer with the %V4L2_BUF_FLAG_LAST is dequeued. |
b25748fe | 503 | * @fileio: file io emulator internal data, used only if emulator is active |
3415a89f | 504 | * @threadio: thread io internal data, used only if thread is active |
e23ccc0a PO |
505 | */ |
506 | struct vb2_queue { | |
bed04f93 | 507 | unsigned int type; |
e23ccc0a | 508 | unsigned int io_modes; |
20be7ab8 | 509 | struct device *dev; |
00085f1e | 510 | unsigned long dma_attrs; |
5b6f9abe | 511 | unsigned bidirectional:1; |
06e7a9b6 KD |
512 | unsigned fileio_read_once:1; |
513 | unsigned fileio_write_immediately:1; | |
f61bf13b | 514 | unsigned allow_zero_bytesused:1; |
b9387684 | 515 | unsigned quirk_poll_must_check_waiting_for_buffers:1; |
06e7a9b6 | 516 | |
5a5adf6b | 517 | struct mutex *lock; |
bed04f93 | 518 | void *owner; |
e23ccc0a PO |
519 | |
520 | const struct vb2_ops *ops; | |
521 | const struct vb2_mem_ops *mem_ops; | |
b0e0e1f8 JS |
522 | const struct vb2_buf_ops *buf_ops; |
523 | ||
e23ccc0a PO |
524 | void *drv_priv; |
525 | unsigned int buf_struct_size; | |
ade48681 | 526 | u32 timestamp_flags; |
b6ba2057 | 527 | gfp_t gfp_flags; |
b3379c62 | 528 | u32 min_buffers_needed; |
e23ccc0a | 529 | |
2b141324 MCC |
530 | struct device *alloc_devs[VB2_MAX_PLANES]; |
531 | ||
d78757e7 | 532 | /* private: internal use only */ |
f035eb4e | 533 | struct mutex mmap_lock; |
bed04f93 | 534 | unsigned int memory; |
5b6f9abe | 535 | enum dma_data_direction dma_dir; |
bed04f93 | 536 | struct vb2_buffer *bufs[VB2_MAX_FRAME]; |
e23ccc0a PO |
537 | unsigned int num_buffers; |
538 | ||
539 | struct list_head queued_list; | |
b3379c62 | 540 | unsigned int queued_count; |
e23ccc0a | 541 | |
6ea3b980 | 542 | atomic_t owned_by_drv_count; |
e23ccc0a PO |
543 | struct list_head done_list; |
544 | spinlock_t done_lock; | |
545 | wait_queue_head_t done_wq; | |
546 | ||
e23ccc0a | 547 | unsigned int streaming:1; |
b3379c62 | 548 | unsigned int start_streaming_called:1; |
4bb7267d | 549 | unsigned int error:1; |
58d75f4b | 550 | unsigned int waiting_for_buffers:1; |
bed04f93 JS |
551 | unsigned int is_multiplanar:1; |
552 | unsigned int is_output:1; | |
959c3ef3 | 553 | unsigned int copy_timestamp:1; |
c1621840 | 554 | unsigned int last_buffer_dequeued:1; |
b25748fe MS |
555 | |
556 | struct vb2_fileio_data *fileio; | |
3415a89f | 557 | struct vb2_threadio_data *threadio; |
b5b4541e HV |
558 | |
559 | #ifdef CONFIG_VIDEO_ADV_DEBUG | |
560 | /* | |
561 | * Counters for how often these queue-related ops are | |
562 | * called. Used to check for unbalanced ops. | |
563 | */ | |
564 | u32 cnt_queue_setup; | |
565 | u32 cnt_wait_prepare; | |
566 | u32 cnt_wait_finish; | |
567 | u32 cnt_start_streaming; | |
568 | u32 cnt_stop_streaming; | |
569 | #endif | |
e23ccc0a PO |
570 | }; |
571 | ||
88b7eb09 | 572 | /** |
2b141324 MCC |
573 | * vb2_plane_vaddr() - Return a kernel virtual address of a given plane. |
574 | * @vb: pointer to &struct vb2_buffer to which the plane in | |
575 | * question belongs to. | |
576 | * @plane_no: plane number for which the address is to be returned. | |
88b7eb09 MCC |
577 | * |
578 | * This function returns a kernel virtual address of a given plane if | |
579 | * such a mapping exist, NULL otherwise. | |
580 | */ | |
e23ccc0a | 581 | void *vb2_plane_vaddr(struct vb2_buffer *vb, unsigned int plane_no); |
88b7eb09 MCC |
582 | |
583 | /** | |
2b141324 MCC |
584 | * vb2_plane_cookie() - Return allocator specific cookie for the given plane. |
585 | * @vb: pointer to &struct vb2_buffer to which the plane in | |
586 | * question belongs to. | |
587 | * @plane_no: plane number for which the cookie is to be returned. | |
88b7eb09 MCC |
588 | * |
589 | * This function returns an allocator specific cookie for a given plane if | |
590 | * available, NULL otherwise. The allocator should provide some simple static | |
591 | * inline function, which would convert this cookie to the allocator specific | |
592 | * type that can be used directly by the driver to access the buffer. This can | |
593 | * be for example physical address, pointer to scatter list or IOMMU mapping. | |
594 | */ | |
e23ccc0a PO |
595 | void *vb2_plane_cookie(struct vb2_buffer *vb, unsigned int plane_no); |
596 | ||
88b7eb09 | 597 | /** |
2b141324 MCC |
598 | * vb2_buffer_done() - inform videobuf that an operation on a buffer |
599 | * is finished. | |
600 | * @vb: pointer to &struct vb2_buffer to be used. | |
601 | * @state: state of the buffer, as defined by &enum vb2_buffer_state. | |
602 | * Either %VB2_BUF_STATE_DONE if the operation finished | |
f286f4df MCC |
603 | * successfully, %VB2_BUF_STATE_ERROR if the operation finished |
604 | * with an error or %VB2_BUF_STATE_QUEUED if the driver wants to | |
45ad3999 | 605 | * requeue buffers. |
88b7eb09 MCC |
606 | * |
607 | * This function should be called by the driver after a hardware operation on | |
608 | * a buffer is finished and the buffer may be returned to userspace. The driver | |
609 | * cannot use this buffer anymore until it is queued back to it by videobuf | |
f286f4df MCC |
610 | * by the means of &vb2_ops->buf_queue callback. Only buffers previously queued |
611 | * to the driver by &vb2_ops->buf_queue can be passed to this function. | |
88b7eb09 MCC |
612 | * |
613 | * While streaming a buffer can only be returned in state DONE or ERROR. | |
45ad3999 LC |
614 | * The &vb2_ops->start_streaming op can also return them in case the DMA engine |
615 | * cannot be started for some reason. In that case the buffers should be | |
616 | * returned with state QUEUED to put them back into the queue. | |
88b7eb09 | 617 | */ |
e23ccc0a | 618 | void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state); |
88b7eb09 MCC |
619 | |
620 | /** | |
2b141324 MCC |
621 | * vb2_discard_done() - discard all buffers marked as DONE. |
622 | * @q: pointer to &struct vb2_queue with videobuf2 queue. | |
88b7eb09 MCC |
623 | * |
624 | * This function is intended to be used with suspend/resume operations. It | |
625 | * discards all 'done' buffers as they would be too old to be requested after | |
626 | * resume. | |
627 | * | |
628 | * Drivers must stop the hardware and synchronize with interrupt handlers and/or | |
629 | * delayed works before calling this function to make sure no buffer will be | |
630 | * touched by the driver and/or hardware. | |
631 | */ | |
34ea4d44 | 632 | void vb2_discard_done(struct vb2_queue *q); |
88b7eb09 MCC |
633 | |
634 | /** | |
2b141324 MCC |
635 | * vb2_wait_for_all_buffers() - wait until all buffers are given back to vb2. |
636 | * @q: pointer to &struct vb2_queue with videobuf2 queue. | |
88b7eb09 MCC |
637 | * |
638 | * This function will wait until all buffers that have been given to the driver | |
f286f4df | 639 | * by &vb2_ops->buf_queue are given back to vb2 with vb2_buffer_done(). It |
2b141324 MCC |
640 | * doesn't call &vb2_ops->wait_prepare/&vb2_ops->wait_finish pair. |
641 | * It is intended to be called with all locks taken, for example from | |
642 | * &vb2_ops->stop_streaming callback. | |
88b7eb09 | 643 | */ |
e23ccc0a PO |
644 | int vb2_wait_for_all_buffers(struct vb2_queue *q); |
645 | ||
88b7eb09 | 646 | /** |
2b141324 MCC |
647 | * vb2_core_querybuf() - query video buffer information. |
648 | * @q: pointer to &struct vb2_queue with videobuf2 queue. | |
649 | * @index: id number of the buffer. | |
650 | * @pb: buffer struct passed from userspace. | |
651 | * | |
991232a9 MCC |
652 | * Videobuf2 core helper to implement VIDIOC_QUERYBUF() operation. It is called |
653 | * internally by VB2 by an API-specific handler, like ``videobuf2-v4l2.h``. | |
88b7eb09 | 654 | * |
88b7eb09 | 655 | * The passed buffer should have been verified. |
2b141324 | 656 | * |
88b7eb09 | 657 | * This function fills the relevant information for the userspace. |
991232a9 MCC |
658 | * |
659 | * Return: returns zero on success; an error code otherwise. | |
88b7eb09 | 660 | */ |
10cc3b1e | 661 | void vb2_core_querybuf(struct vb2_queue *q, unsigned int index, void *pb); |
88b7eb09 MCC |
662 | |
663 | /** | |
2b141324 MCC |
664 | * vb2_core_reqbufs() - Initiate streaming. |
665 | * @q: pointer to &struct vb2_queue with videobuf2 queue. | |
666 | * @memory: memory type, as defined by &enum vb2_memory. | |
667 | * @count: requested buffer count. | |
88b7eb09 | 668 | * |
991232a9 MCC |
669 | * Videobuf2 core helper to implement VIDIOC_REQBUF() operation. It is called |
670 | * internally by VB2 by an API-specific handler, like ``videobuf2-v4l2.h``. | |
f286f4df | 671 | * |
88b7eb09 | 672 | * This function: |
f286f4df | 673 | * |
991232a9 MCC |
674 | * #) verifies streaming parameters passed from the userspace; |
675 | * #) sets up the queue; | |
f286f4df | 676 | * #) negotiates number of buffers and planes per buffer with the driver |
991232a9 | 677 | * to be used during streaming; |
60e7926b | 678 | * #) allocates internal buffer structures (&struct vb2_buffer), according to |
991232a9 | 679 | * the agreed parameters; |
f286f4df | 680 | * #) for MMAP memory type, allocates actual video memory, using the |
991232a9 | 681 | * memory handling/allocation routines provided during queue initialization. |
88b7eb09 MCC |
682 | * |
683 | * If req->count is 0, all the memory will be freed instead. | |
88b7eb09 | 684 | * |
2b141324 MCC |
685 | * If the queue has been allocated previously by a previous vb2_core_reqbufs() |
686 | * call and the queue is not busy, memory will be reallocated. | |
88b7eb09 | 687 | * |
991232a9 | 688 | * Return: returns zero on success; an error code otherwise. |
88b7eb09 | 689 | */ |
3c5be988 JS |
690 | int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory, |
691 | unsigned int *count); | |
88b7eb09 MCC |
692 | |
693 | /** | |
694 | * vb2_core_create_bufs() - Allocate buffers and any required auxiliary structs | |
2b141324 MCC |
695 | * @q: pointer to &struct vb2_queue with videobuf2 queue. |
696 | * @memory: memory type, as defined by &enum vb2_memory. | |
697 | * @count: requested buffer count. | |
698 | * @requested_planes: number of planes requested. | |
699 | * @requested_sizes: array with the size of the planes. | |
700 | * | |
991232a9 MCC |
701 | * Videobuf2 core helper to implement VIDIOC_CREATE_BUFS() operation. It is |
702 | * called internally by VB2 by an API-specific handler, like | |
703 | * ``videobuf2-v4l2.h``. | |
88b7eb09 | 704 | * |
88b7eb09 | 705 | * This function: |
88b7eb09 | 706 | * |
991232a9 MCC |
707 | * #) verifies parameter sanity; |
708 | * #) calls the &vb2_ops->queue_setup queue operation; | |
709 | * #) performs any necessary memory allocations. | |
f286f4df | 710 | * |
991232a9 | 711 | * Return: returns zero on success; an error code otherwise. |
88b7eb09 | 712 | */ |
3c5be988 | 713 | int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory, |
f286f4df MCC |
714 | unsigned int *count, unsigned int requested_planes, |
715 | const unsigned int requested_sizes[]); | |
88b7eb09 MCC |
716 | |
717 | /** | |
718 | * vb2_core_prepare_buf() - Pass ownership of a buffer from userspace | |
2b141324 MCC |
719 | * to the kernel. |
720 | * @q: pointer to &struct vb2_queue with videobuf2 queue. | |
721 | * @index: id number of the buffer. | |
722 | * @pb: buffer structure passed from userspace to | |
723 | * &v4l2_ioctl_ops->vidioc_prepare_buf handler in driver. | |
724 | * | |
991232a9 MCC |
725 | * Videobuf2 core helper to implement VIDIOC_PREPARE_BUF() operation. It is |
726 | * called internally by VB2 by an API-specific handler, like | |
727 | * ``videobuf2-v4l2.h``. | |
88b7eb09 | 728 | * |
88b7eb09 | 729 | * The passed buffer should have been verified. |
88b7eb09 | 730 | * |
991232a9 MCC |
731 | * This function calls vb2_ops->buf_prepare callback in the driver |
732 | * (if provided), in which driver-specific buffer initialization can | |
733 | * be performed. | |
88b7eb09 | 734 | * |
991232a9 | 735 | * Return: returns zero on success; an error code otherwise. |
88b7eb09 | 736 | */ |
3c5be988 | 737 | int vb2_core_prepare_buf(struct vb2_queue *q, unsigned int index, void *pb); |
88b7eb09 MCC |
738 | |
739 | /** | |
740 | * vb2_core_qbuf() - Queue a buffer from userspace | |
f286f4df | 741 | * |
2b141324 | 742 | * @q: pointer to &struct vb2_queue with videobuf2 queue. |
88b7eb09 | 743 | * @index: id number of the buffer |
2b141324 MCC |
744 | * @pb: buffer structure passed from userspace to |
745 | * v4l2_ioctl_ops->vidioc_qbuf handler in driver | |
88b7eb09 | 746 | * |
991232a9 MCC |
747 | * Videobuf2 core helper to implement VIDIOC_QBUF() operation. It is called |
748 | * internally by VB2 by an API-specific handler, like ``videobuf2-v4l2.h``. | |
f286f4df | 749 | * |
88b7eb09 | 750 | * This function: |
f286f4df | 751 | * |
991232a9 MCC |
752 | * #) if necessary, calls &vb2_ops->buf_prepare callback in the driver |
753 | * (if provided), in which driver-specific buffer initialization can | |
754 | * be performed; | |
f286f4df MCC |
755 | * #) if streaming is on, queues the buffer in driver by the means of |
756 | * &vb2_ops->buf_queue callback for processing. | |
88b7eb09 | 757 | * |
991232a9 | 758 | * Return: returns zero on success; an error code otherwise. |
88b7eb09 | 759 | */ |
3c5be988 | 760 | int vb2_core_qbuf(struct vb2_queue *q, unsigned int index, void *pb); |
88b7eb09 MCC |
761 | |
762 | /** | |
763 | * vb2_core_dqbuf() - Dequeue a buffer to the userspace | |
2b141324 | 764 | * @q: pointer to &struct vb2_queue with videobuf2 queue |
88b7eb09 | 765 | * @pindex: pointer to the buffer index. May be NULL |
2b141324 MCC |
766 | * @pb: buffer structure passed from userspace to |
767 | * v4l2_ioctl_ops->vidioc_dqbuf handler in driver. | |
88b7eb09 MCC |
768 | * @nonblocking: if true, this call will not sleep waiting for a buffer if no |
769 | * buffers ready for dequeuing are present. Normally the driver | |
2b141324 | 770 | * would be passing (file->f_flags & O_NONBLOCK) here. |
88b7eb09 | 771 | * |
991232a9 MCC |
772 | * Videobuf2 core helper to implement VIDIOC_DQBUF() operation. It is called |
773 | * internally by VB2 by an API-specific handler, like ``videobuf2-v4l2.h``. | |
f286f4df | 774 | * |
88b7eb09 | 775 | * This function: |
f286f4df MCC |
776 | * |
777 | * #) calls buf_finish callback in the driver (if provided), in which | |
88b7eb09 MCC |
778 | * driver can perform any additional operations that may be required before |
779 | * returning the buffer to userspace, such as cache sync, | |
f286f4df | 780 | * #) the buffer struct members are filled with relevant information for |
88b7eb09 MCC |
781 | * the userspace. |
782 | * | |
991232a9 | 783 | * Return: returns zero on success; an error code otherwise. |
88b7eb09 | 784 | */ |
fac710e4 HV |
785 | int vb2_core_dqbuf(struct vb2_queue *q, unsigned int *pindex, void *pb, |
786 | bool nonblocking); | |
e23ccc0a | 787 | |
8dcde47f MCC |
788 | /** |
789 | * vb2_core_streamon() - Implements VB2 stream ON logic | |
790 | * | |
791 | * @q: pointer to &struct vb2_queue with videobuf2 queue | |
792 | * @type: type of the queue to be started. | |
793 | * For V4L2, this is defined by &enum v4l2_buf_type type. | |
794 | * | |
991232a9 MCC |
795 | * Videobuf2 core helper to implement VIDIOC_STREAMON() operation. It is called |
796 | * internally by VB2 by an API-specific handler, like ``videobuf2-v4l2.h``. | |
797 | * | |
798 | * Return: returns zero on success; an error code otherwise. | |
8dcde47f | 799 | */ |
3c5be988 | 800 | int vb2_core_streamon(struct vb2_queue *q, unsigned int type); |
8dcde47f MCC |
801 | |
802 | /** | |
803 | * vb2_core_streamoff() - Implements VB2 stream OFF logic | |
804 | * | |
805 | * @q: pointer to &struct vb2_queue with videobuf2 queue | |
806 | * @type: type of the queue to be started. | |
807 | * For V4L2, this is defined by &enum v4l2_buf_type type. | |
808 | * | |
991232a9 MCC |
809 | * Videobuf2 core helper to implement VIDIOC_STREAMOFF() operation. It is |
810 | * called internally by VB2 by an API-specific handler, like | |
811 | * ``videobuf2-v4l2.h``. | |
812 | * | |
813 | * Return: returns zero on success; an error code otherwise. | |
8dcde47f | 814 | */ |
3c5be988 | 815 | int vb2_core_streamoff(struct vb2_queue *q, unsigned int type); |
2d86401c | 816 | |
88b7eb09 | 817 | /** |
2b141324 MCC |
818 | * vb2_core_expbuf() - Export a buffer as a file descriptor. |
819 | * @q: pointer to &struct vb2_queue with videobuf2 queue. | |
820 | * @fd: pointer to the file descriptor associated with DMABUF | |
821 | * (set by driver). | |
822 | * @type: buffer type. | |
823 | * @index: id number of the buffer. | |
88b7eb09 | 824 | * @plane: index of the plane to be exported, 0 for single plane queues |
2b141324 MCC |
825 | * @flags: file flags for newly created file, as defined at |
826 | * include/uapi/asm-generic/fcntl.h. | |
827 | * Currently, the only used flag is %O_CLOEXEC. | |
828 | * is supported, refer to manual of open syscall for more details. | |
88b7eb09 | 829 | * |
991232a9 MCC |
830 | * |
831 | * Videobuf2 core helper to implement VIDIOC_EXPBUF() operation. It is called | |
832 | * internally by VB2 by an API-specific handler, like ``videobuf2-v4l2.h``. | |
833 | * | |
834 | * Return: returns zero on success; an error code otherwise. | |
88b7eb09 | 835 | */ |
3c5be988 JS |
836 | int vb2_core_expbuf(struct vb2_queue *q, int *fd, unsigned int type, |
837 | unsigned int index, unsigned int plane, unsigned int flags); | |
e23ccc0a | 838 | |
88b7eb09 MCC |
839 | /** |
840 | * vb2_core_queue_init() - initialize a videobuf2 queue | |
2b141324 MCC |
841 | * @q: pointer to &struct vb2_queue with videobuf2 queue. |
842 | * This structure should be allocated in driver | |
88b7eb09 | 843 | * |
60e7926b | 844 | * The &vb2_queue structure should be allocated by the driver. The driver is |
88b7eb09 MCC |
845 | * responsible of clearing it's content and setting initial values for some |
846 | * required entries before calling this function. | |
2b141324 MCC |
847 | * |
848 | * .. note:: | |
849 | * | |
850 | * The following fields at @q should be set before calling this function: | |
851 | * &vb2_queue->ops, &vb2_queue->mem_ops, &vb2_queue->type. | |
88b7eb09 | 852 | */ |
3c5be988 | 853 | int vb2_core_queue_init(struct vb2_queue *q); |
88b7eb09 MCC |
854 | |
855 | /** | |
856 | * vb2_core_queue_release() - stop streaming, release the queue and free memory | |
2b141324 | 857 | * @q: pointer to &struct vb2_queue with videobuf2 queue. |
88b7eb09 MCC |
858 | * |
859 | * This function stops streaming and performs necessary clean ups, including | |
860 | * freeing video buffer memory. The driver is responsible for freeing | |
2b141324 | 861 | * the &struct vb2_queue itself. |
88b7eb09 | 862 | */ |
3c5be988 | 863 | void vb2_core_queue_release(struct vb2_queue *q); |
e23ccc0a | 864 | |
88b7eb09 MCC |
865 | /** |
866 | * vb2_queue_error() - signal a fatal error on the queue | |
2b141324 | 867 | * @q: pointer to &struct vb2_queue with videobuf2 queue. |
88b7eb09 MCC |
868 | * |
869 | * Flag that a fatal unrecoverable error has occurred and wake up all processes | |
a9a08845 | 870 | * waiting on the queue. Polling will now set %EPOLLERR and queuing and dequeuing |
2b141324 | 871 | * buffers will return %-EIO. |
88b7eb09 | 872 | * |
60e7926b MCC |
873 | * The error flag will be cleared when canceling the queue, either from |
874 | * vb2_streamoff() or vb2_queue_release(). Drivers should thus not call this | |
88b7eb09 MCC |
875 | * function before starting the stream, otherwise the error flag will remain set |
876 | * until the queue is released when closing the device node. | |
877 | */ | |
3c5be988 | 878 | void vb2_queue_error(struct vb2_queue *q); |
e23ccc0a | 879 | |
88b7eb09 | 880 | /** |
2b141324 MCC |
881 | * vb2_mmap() - map video buffers into application address space. |
882 | * @q: pointer to &struct vb2_queue with videobuf2 queue. | |
883 | * @vma: pointer to &struct vm_area_struct with the vma passed | |
884 | * to the mmap file operation handler in the driver. | |
88b7eb09 MCC |
885 | * |
886 | * Should be called from mmap file operation handler of a driver. | |
887 | * This function maps one plane of one of the available video buffers to | |
888 | * userspace. To map whole video memory allocated on reqbufs, this function | |
889 | * has to be called once per each plane per each buffer previously allocated. | |
890 | * | |
891 | * When the userspace application calls mmap, it passes to it an offset returned | |
2b141324 MCC |
892 | * to it earlier by the means of &v4l2_ioctl_ops->vidioc_querybuf handler. |
893 | * That offset acts as a "cookie", which is then used to identify the plane | |
894 | * to be mapped. | |
895 | * | |
88b7eb09 MCC |
896 | * This function finds a plane with a matching offset and a mapping is performed |
897 | * by the means of a provided memory operation. | |
898 | * | |
899 | * The return values from this function are intended to be directly returned | |
900 | * from the mmap handler in driver. | |
901 | */ | |
e23ccc0a | 902 | int vb2_mmap(struct vb2_queue *q, struct vm_area_struct *vma); |
f286f4df | 903 | |
6f524ec1 | 904 | #ifndef CONFIG_MMU |
8dcde47f MCC |
905 | /** |
906 | * vb2_get_unmapped_area - map video buffers into application address space. | |
907 | * @q: pointer to &struct vb2_queue with videobuf2 queue. | |
908 | * @addr: memory address. | |
909 | * @len: buffer size. | |
910 | * @pgoff: page offset. | |
911 | * @flags: memory flags. | |
912 | * | |
913 | * This function is used in noMMU platforms to propose address mapping | |
914 | * for a given buffer. It's intended to be used as a handler for the | |
915 | * &file_operations->get_unmapped_area operation. | |
916 | * | |
917 | * This is called by the mmap() syscall routines will call this | |
918 | * to get a proposed address for the mapping, when ``!CONFIG_MMU``. | |
919 | */ | |
6f524ec1 SJ |
920 | unsigned long vb2_get_unmapped_area(struct vb2_queue *q, |
921 | unsigned long addr, | |
922 | unsigned long len, | |
923 | unsigned long pgoff, | |
924 | unsigned long flags); | |
925 | #endif | |
88b7eb09 MCC |
926 | |
927 | /** | |
8dcde47f | 928 | * vb2_core_poll() - implements poll syscall() logic. |
2b141324 MCC |
929 | * @q: pointer to &struct vb2_queue with videobuf2 queue. |
930 | * @file: &struct file argument passed to the poll | |
931 | * file operation handler. | |
932 | * @wait: &poll_table wait argument passed to the poll | |
933 | * file operation handler. | |
88b7eb09 MCC |
934 | * |
935 | * This function implements poll file operation handler for a driver. | |
936 | * For CAPTURE queues, if a buffer is ready to be dequeued, the userspace will | |
937 | * be informed that the file descriptor of a video device is available for | |
938 | * reading. | |
939 | * For OUTPUT queues, if a buffer is ready to be dequeued, the file descriptor | |
940 | * will be reported as available for writing. | |
941 | * | |
942 | * The return values from this function are intended to be directly returned | |
943 | * from poll handler in driver. | |
944 | */ | |
c23e0cb8 | 945 | __poll_t vb2_core_poll(struct vb2_queue *q, struct file *file, |
f286f4df MCC |
946 | poll_table *wait); |
947 | ||
8dcde47f MCC |
948 | /** |
949 | * vb2_read() - implements read() syscall logic. | |
950 | * @q: pointer to &struct vb2_queue with videobuf2 queue. | |
951 | * @data: pointed to target userspace buffer | |
952 | * @count: number of bytes to read | |
953 | * @ppos: file handle position tracking pointer | |
954 | * @nonblock: mode selector (1 means blocking calls, 0 means nonblocking) | |
955 | */ | |
af3bac1a JS |
956 | size_t vb2_read(struct vb2_queue *q, char __user *data, size_t count, |
957 | loff_t *ppos, int nonblock); | |
8dcde47f MCC |
958 | /** |
959 | * vb2_read() - implements write() syscall logic. | |
960 | * @q: pointer to &struct vb2_queue with videobuf2 queue. | |
961 | * @data: pointed to target userspace buffer | |
962 | * @count: number of bytes to write | |
963 | * @ppos: file handle position tracking pointer | |
964 | * @nonblock: mode selector (1 means blocking calls, 0 means nonblocking) | |
965 | */ | |
af3bac1a JS |
966 | size_t vb2_write(struct vb2_queue *q, const char __user *data, size_t count, |
967 | loff_t *ppos, int nonblock); | |
968 | ||
f286f4df | 969 | /** |
2b141324 | 970 | * typedef vb2_thread_fnc - callback function for use with vb2_thread. |
f286f4df | 971 | * |
2b141324 MCC |
972 | * @vb: pointer to struct &vb2_buffer. |
973 | * @priv: pointer to a private data. | |
af3bac1a JS |
974 | * |
975 | * This is called whenever a buffer is dequeued in the thread. | |
976 | */ | |
977 | typedef int (*vb2_thread_fnc)(struct vb2_buffer *vb, void *priv); | |
978 | ||
979 | /** | |
980 | * vb2_thread_start() - start a thread for the given queue. | |
2b141324 MCC |
981 | * @q: pointer to &struct vb2_queue with videobuf2 queue. |
982 | * @fnc: &vb2_thread_fnc callback function. | |
983 | * @priv: priv pointer passed to the callback function. | |
af3bac1a JS |
984 | * @thread_name:the name of the thread. This will be prefixed with "vb2-". |
985 | * | |
986 | * This starts a thread that will queue and dequeue until an error occurs | |
2b141324 | 987 | * or vb2_thread_stop() is called. |
af3bac1a | 988 | * |
f286f4df MCC |
989 | * .. attention:: |
990 | * | |
991 | * This function should not be used for anything else but the videobuf2-dvb | |
992 | * support. If you think you have another good use-case for this, then please | |
993 | * contact the linux-media mailing list first. | |
af3bac1a JS |
994 | */ |
995 | int vb2_thread_start(struct vb2_queue *q, vb2_thread_fnc fnc, void *priv, | |
996 | const char *thread_name); | |
997 | ||
998 | /** | |
999 | * vb2_thread_stop() - stop the thread for the given queue. | |
2b141324 | 1000 | * @q: pointer to &struct vb2_queue with videobuf2 queue. |
af3bac1a JS |
1001 | */ |
1002 | int vb2_thread_stop(struct vb2_queue *q); | |
e23ccc0a PO |
1003 | |
1004 | /** | |
2b141324 MCC |
1005 | * vb2_is_streaming() - return streaming status of the queue. |
1006 | * @q: pointer to &struct vb2_queue with videobuf2 queue. | |
e23ccc0a PO |
1007 | */ |
1008 | static inline bool vb2_is_streaming(struct vb2_queue *q) | |
1009 | { | |
1010 | return q->streaming; | |
1011 | } | |
1012 | ||
74753cff HV |
1013 | /** |
1014 | * vb2_fileio_is_active() - return true if fileio is active. | |
2b141324 | 1015 | * @q: pointer to &struct vb2_queue with videobuf2 queue. |
74753cff HV |
1016 | * |
1017 | * This returns true if read() or write() is used to stream the data | |
1018 | * as opposed to stream I/O. This is almost never an important distinction, | |
1019 | * except in rare cases. One such case is that using read() or write() to | |
2b141324 | 1020 | * stream a format using %V4L2_FIELD_ALTERNATE is not allowed since there |
74753cff HV |
1021 | * is no way you can pass the field information of each buffer to/from |
1022 | * userspace. A driver that supports this field format should check for | |
2b141324 MCC |
1023 | * this in the &vb2_ops->queue_setup op and reject it if this function returns |
1024 | * true. | |
74753cff HV |
1025 | */ |
1026 | static inline bool vb2_fileio_is_active(struct vb2_queue *q) | |
1027 | { | |
1028 | return q->fileio; | |
1029 | } | |
1030 | ||
e23ccc0a | 1031 | /** |
2b141324 MCC |
1032 | * vb2_is_busy() - return busy status of the queue. |
1033 | * @q: pointer to &struct vb2_queue with videobuf2 queue. | |
e23ccc0a PO |
1034 | * |
1035 | * This function checks if queue has any buffers allocated. | |
1036 | */ | |
1037 | static inline bool vb2_is_busy(struct vb2_queue *q) | |
1038 | { | |
1039 | return (q->num_buffers > 0); | |
1040 | } | |
1041 | ||
1042 | /** | |
2b141324 MCC |
1043 | * vb2_get_drv_priv() - return driver private data associated with the queue. |
1044 | * @q: pointer to &struct vb2_queue with videobuf2 queue. | |
e23ccc0a PO |
1045 | */ |
1046 | static inline void *vb2_get_drv_priv(struct vb2_queue *q) | |
1047 | { | |
1048 | return q->drv_priv; | |
1049 | } | |
1050 | ||
1051 | /** | |
2b141324 MCC |
1052 | * vb2_set_plane_payload() - set bytesused for the plane @plane_no. |
1053 | * @vb: pointer to &struct vb2_buffer to which the plane in | |
1054 | * question belongs to. | |
1055 | * @plane_no: plane number for which payload should be set. | |
1056 | * @size: payload in bytes. | |
e23ccc0a PO |
1057 | */ |
1058 | static inline void vb2_set_plane_payload(struct vb2_buffer *vb, | |
1059 | unsigned int plane_no, unsigned long size) | |
1060 | { | |
1061 | if (plane_no < vb->num_planes) | |
2d700715 | 1062 | vb->planes[plane_no].bytesused = size; |
e23ccc0a PO |
1063 | } |
1064 | ||
1065 | /** | |
9f00edae | 1066 | * vb2_get_plane_payload() - get bytesused for the plane plane_no |
2b141324 MCC |
1067 | * @vb: pointer to &struct vb2_buffer to which the plane in |
1068 | * question belongs to. | |
1069 | * @plane_no: plane number for which payload should be set. | |
e23ccc0a PO |
1070 | */ |
1071 | static inline unsigned long vb2_get_plane_payload(struct vb2_buffer *vb, | |
1072 | unsigned int plane_no) | |
1073 | { | |
1074 | if (plane_no < vb->num_planes) | |
2d700715 | 1075 | return vb->planes[plane_no].bytesused; |
e23ccc0a PO |
1076 | return 0; |
1077 | } | |
1078 | ||
1079 | /** | |
2b141324 MCC |
1080 | * vb2_plane_size() - return plane size in bytes. |
1081 | * @vb: pointer to &struct vb2_buffer to which the plane in | |
1082 | * question belongs to. | |
1083 | * @plane_no: plane number for which size should be returned. | |
e23ccc0a PO |
1084 | */ |
1085 | static inline unsigned long | |
1086 | vb2_plane_size(struct vb2_buffer *vb, unsigned int plane_no) | |
1087 | { | |
1088 | if (plane_no < vb->num_planes) | |
2d700715 | 1089 | return vb->planes[plane_no].length; |
e23ccc0a PO |
1090 | return 0; |
1091 | } | |
1092 | ||
ead13033 | 1093 | /** |
2b141324 MCC |
1094 | * vb2_start_streaming_called() - return streaming status of driver. |
1095 | * @q: pointer to &struct vb2_queue with videobuf2 queue. | |
ead13033 PL |
1096 | */ |
1097 | static inline bool vb2_start_streaming_called(struct vb2_queue *q) | |
1098 | { | |
1099 | return q->start_streaming_called; | |
1100 | } | |
1101 | ||
c1621840 | 1102 | /** |
2b141324 MCC |
1103 | * vb2_clear_last_buffer_dequeued() - clear last buffer dequeued flag of queue. |
1104 | * @q: pointer to &struct vb2_queue with videobuf2 queue. | |
c1621840 PZ |
1105 | */ |
1106 | static inline void vb2_clear_last_buffer_dequeued(struct vb2_queue *q) | |
1107 | { | |
1108 | q->last_buffer_dequeued = false; | |
1109 | } | |
1110 | ||
af3bac1a JS |
1111 | /* |
1112 | * The following functions are not part of the vb2 core API, but are useful | |
1113 | * functions for videobuf2-*. | |
1114 | */ | |
88b7eb09 MCC |
1115 | |
1116 | /** | |
1117 | * vb2_buffer_in_use() - return true if the buffer is in use and | |
2b141324 | 1118 | * the queue cannot be freed (by the means of VIDIOC_REQBUFS(0)) call. |
88b7eb09 | 1119 | * |
2b141324 MCC |
1120 | * @vb: buffer for which plane size should be returned. |
1121 | * @q: pointer to &struct vb2_queue with videobuf2 queue. | |
88b7eb09 | 1122 | */ |
af3bac1a | 1123 | bool vb2_buffer_in_use(struct vb2_queue *q, struct vb2_buffer *vb); |
88b7eb09 MCC |
1124 | |
1125 | /** | |
1126 | * vb2_verify_memory_type() - Check whether the memory type and buffer type | |
1127 | * passed to a buffer operation are compatible with the queue. | |
f286f4df | 1128 | * |
2b141324 | 1129 | * @q: pointer to &struct vb2_queue with videobuf2 queue. |
f286f4df MCC |
1130 | * @memory: memory model, as defined by enum &vb2_memory. |
1131 | * @type: private buffer type whose content is defined by the vb2-core | |
1132 | * caller. For example, for V4L2, it should match | |
2b141324 | 1133 | * the types defined on enum &v4l2_buf_type. |
88b7eb09 | 1134 | */ |
af3bac1a JS |
1135 | int vb2_verify_memory_type(struct vb2_queue *q, |
1136 | enum vb2_memory memory, unsigned int type); | |
e23ccc0a | 1137 | #endif /* _MEDIA_VIDEOBUF2_CORE_H */ |