Commit | Line | Data |
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e23ccc0a PO |
1 | /* |
2 | * videobuf2-core.c - V4L2 driver helper framework | |
3 | * | |
4 | * Copyright (C) 2010 Samsung Electronics | |
5 | * | |
95072084 | 6 | * Author: Pawel Osciak <pawel@osciak.com> |
e23ccc0a PO |
7 | * Marek Szyprowski <m.szyprowski@samsung.com> |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation. | |
12 | */ | |
13 | ||
14 | #include <linux/err.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/mm.h> | |
18 | #include <linux/poll.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/sched.h> | |
21 | ||
95213ceb HV |
22 | #include <media/v4l2-dev.h> |
23 | #include <media/v4l2-fh.h> | |
24 | #include <media/v4l2-event.h> | |
e23ccc0a PO |
25 | #include <media/videobuf2-core.h> |
26 | ||
27 | static int debug; | |
28 | module_param(debug, int, 0644); | |
29 | ||
30 | #define dprintk(level, fmt, arg...) \ | |
31 | do { \ | |
32 | if (debug >= level) \ | |
33 | printk(KERN_DEBUG "vb2: " fmt, ## arg); \ | |
34 | } while (0) | |
35 | ||
5931ffe3 | 36 | #define call_memop(q, op, args...) \ |
e23ccc0a PO |
37 | (((q)->mem_ops->op) ? \ |
38 | ((q)->mem_ops->op(args)) : 0) | |
39 | ||
40 | #define call_qop(q, op, args...) \ | |
41 | (((q)->ops->op) ? ((q)->ops->op(args)) : 0) | |
42 | ||
ea42c8ec | 43 | #define V4L2_BUFFER_STATE_FLAGS (V4L2_BUF_FLAG_MAPPED | V4L2_BUF_FLAG_QUEUED | \ |
2d86401c GL |
44 | V4L2_BUF_FLAG_DONE | V4L2_BUF_FLAG_ERROR | \ |
45 | V4L2_BUF_FLAG_PREPARED) | |
ea42c8ec | 46 | |
e23ccc0a PO |
47 | /** |
48 | * __vb2_buf_mem_alloc() - allocate video memory for the given buffer | |
49 | */ | |
c1426bc7 | 50 | static int __vb2_buf_mem_alloc(struct vb2_buffer *vb) |
e23ccc0a PO |
51 | { |
52 | struct vb2_queue *q = vb->vb2_queue; | |
53 | void *mem_priv; | |
54 | int plane; | |
55 | ||
56 | /* Allocate memory for all planes in this buffer */ | |
57 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
5931ffe3 | 58 | mem_priv = call_memop(q, alloc, q->alloc_ctx[plane], |
c1426bc7 | 59 | q->plane_sizes[plane]); |
62a79436 | 60 | if (IS_ERR_OR_NULL(mem_priv)) |
e23ccc0a PO |
61 | goto free; |
62 | ||
63 | /* Associate allocator private data with this plane */ | |
64 | vb->planes[plane].mem_priv = mem_priv; | |
c1426bc7 | 65 | vb->v4l2_planes[plane].length = q->plane_sizes[plane]; |
e23ccc0a PO |
66 | } |
67 | ||
68 | return 0; | |
69 | free: | |
70 | /* Free already allocated memory if one of the allocations failed */ | |
a00d0266 | 71 | for (; plane > 0; --plane) { |
5931ffe3 | 72 | call_memop(q, put, vb->planes[plane - 1].mem_priv); |
a00d0266 MS |
73 | vb->planes[plane - 1].mem_priv = NULL; |
74 | } | |
e23ccc0a PO |
75 | |
76 | return -ENOMEM; | |
77 | } | |
78 | ||
79 | /** | |
80 | * __vb2_buf_mem_free() - free memory of the given buffer | |
81 | */ | |
82 | static void __vb2_buf_mem_free(struct vb2_buffer *vb) | |
83 | { | |
84 | struct vb2_queue *q = vb->vb2_queue; | |
85 | unsigned int plane; | |
86 | ||
87 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
5931ffe3 | 88 | call_memop(q, put, vb->planes[plane].mem_priv); |
e23ccc0a | 89 | vb->planes[plane].mem_priv = NULL; |
a00d0266 MS |
90 | dprintk(3, "Freed plane %d of buffer %d\n", plane, |
91 | vb->v4l2_buf.index); | |
e23ccc0a PO |
92 | } |
93 | } | |
94 | ||
95 | /** | |
96 | * __vb2_buf_userptr_put() - release userspace memory associated with | |
97 | * a USERPTR buffer | |
98 | */ | |
99 | static void __vb2_buf_userptr_put(struct vb2_buffer *vb) | |
100 | { | |
101 | struct vb2_queue *q = vb->vb2_queue; | |
102 | unsigned int plane; | |
103 | ||
104 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
a00d0266 MS |
105 | if (vb->planes[plane].mem_priv) |
106 | call_memop(q, put_userptr, vb->planes[plane].mem_priv); | |
107 | vb->planes[plane].mem_priv = NULL; | |
e23ccc0a PO |
108 | } |
109 | } | |
110 | ||
111 | /** | |
112 | * __setup_offsets() - setup unique offsets ("cookies") for every plane in | |
113 | * every buffer on the queue | |
114 | */ | |
2d86401c | 115 | static void __setup_offsets(struct vb2_queue *q, unsigned int n) |
e23ccc0a PO |
116 | { |
117 | unsigned int buffer, plane; | |
118 | struct vb2_buffer *vb; | |
2d86401c | 119 | unsigned long off; |
e23ccc0a | 120 | |
2d86401c GL |
121 | if (q->num_buffers) { |
122 | struct v4l2_plane *p; | |
123 | vb = q->bufs[q->num_buffers - 1]; | |
124 | p = &vb->v4l2_planes[vb->num_planes - 1]; | |
125 | off = PAGE_ALIGN(p->m.mem_offset + p->length); | |
126 | } else { | |
127 | off = 0; | |
128 | } | |
129 | ||
130 | for (buffer = q->num_buffers; buffer < q->num_buffers + n; ++buffer) { | |
e23ccc0a PO |
131 | vb = q->bufs[buffer]; |
132 | if (!vb) | |
133 | continue; | |
134 | ||
135 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
4907602f | 136 | vb->v4l2_planes[plane].length = q->plane_sizes[plane]; |
e23ccc0a PO |
137 | vb->v4l2_planes[plane].m.mem_offset = off; |
138 | ||
139 | dprintk(3, "Buffer %d, plane %d offset 0x%08lx\n", | |
140 | buffer, plane, off); | |
141 | ||
142 | off += vb->v4l2_planes[plane].length; | |
143 | off = PAGE_ALIGN(off); | |
144 | } | |
145 | } | |
146 | } | |
147 | ||
148 | /** | |
149 | * __vb2_queue_alloc() - allocate videobuf buffer structures and (for MMAP type) | |
150 | * video buffer memory for all buffers/planes on the queue and initializes the | |
151 | * queue | |
152 | * | |
153 | * Returns the number of buffers successfully allocated. | |
154 | */ | |
155 | static int __vb2_queue_alloc(struct vb2_queue *q, enum v4l2_memory memory, | |
c1426bc7 | 156 | unsigned int num_buffers, unsigned int num_planes) |
e23ccc0a PO |
157 | { |
158 | unsigned int buffer; | |
159 | struct vb2_buffer *vb; | |
160 | int ret; | |
161 | ||
162 | for (buffer = 0; buffer < num_buffers; ++buffer) { | |
163 | /* Allocate videobuf buffer structures */ | |
164 | vb = kzalloc(q->buf_struct_size, GFP_KERNEL); | |
165 | if (!vb) { | |
166 | dprintk(1, "Memory alloc for buffer struct failed\n"); | |
167 | break; | |
168 | } | |
169 | ||
170 | /* Length stores number of planes for multiplanar buffers */ | |
171 | if (V4L2_TYPE_IS_MULTIPLANAR(q->type)) | |
172 | vb->v4l2_buf.length = num_planes; | |
173 | ||
174 | vb->state = VB2_BUF_STATE_DEQUEUED; | |
175 | vb->vb2_queue = q; | |
176 | vb->num_planes = num_planes; | |
2d86401c | 177 | vb->v4l2_buf.index = q->num_buffers + buffer; |
e23ccc0a PO |
178 | vb->v4l2_buf.type = q->type; |
179 | vb->v4l2_buf.memory = memory; | |
180 | ||
181 | /* Allocate video buffer memory for the MMAP type */ | |
182 | if (memory == V4L2_MEMORY_MMAP) { | |
c1426bc7 | 183 | ret = __vb2_buf_mem_alloc(vb); |
e23ccc0a PO |
184 | if (ret) { |
185 | dprintk(1, "Failed allocating memory for " | |
186 | "buffer %d\n", buffer); | |
187 | kfree(vb); | |
188 | break; | |
189 | } | |
190 | /* | |
191 | * Call the driver-provided buffer initialization | |
192 | * callback, if given. An error in initialization | |
193 | * results in queue setup failure. | |
194 | */ | |
195 | ret = call_qop(q, buf_init, vb); | |
196 | if (ret) { | |
197 | dprintk(1, "Buffer %d %p initialization" | |
198 | " failed\n", buffer, vb); | |
199 | __vb2_buf_mem_free(vb); | |
200 | kfree(vb); | |
201 | break; | |
202 | } | |
203 | } | |
204 | ||
2d86401c | 205 | q->bufs[q->num_buffers + buffer] = vb; |
e23ccc0a PO |
206 | } |
207 | ||
2d86401c | 208 | __setup_offsets(q, buffer); |
e23ccc0a PO |
209 | |
210 | dprintk(1, "Allocated %d buffers, %d plane(s) each\n", | |
2d86401c | 211 | buffer, num_planes); |
e23ccc0a PO |
212 | |
213 | return buffer; | |
214 | } | |
215 | ||
216 | /** | |
217 | * __vb2_free_mem() - release all video buffer memory for a given queue | |
218 | */ | |
2d86401c | 219 | static void __vb2_free_mem(struct vb2_queue *q, unsigned int buffers) |
e23ccc0a PO |
220 | { |
221 | unsigned int buffer; | |
222 | struct vb2_buffer *vb; | |
223 | ||
2d86401c GL |
224 | for (buffer = q->num_buffers - buffers; buffer < q->num_buffers; |
225 | ++buffer) { | |
e23ccc0a PO |
226 | vb = q->bufs[buffer]; |
227 | if (!vb) | |
228 | continue; | |
229 | ||
230 | /* Free MMAP buffers or release USERPTR buffers */ | |
231 | if (q->memory == V4L2_MEMORY_MMAP) | |
232 | __vb2_buf_mem_free(vb); | |
233 | else | |
234 | __vb2_buf_userptr_put(vb); | |
235 | } | |
236 | } | |
237 | ||
238 | /** | |
2d86401c GL |
239 | * __vb2_queue_free() - free buffers at the end of the queue - video memory and |
240 | * related information, if no buffers are left return the queue to an | |
241 | * uninitialized state. Might be called even if the queue has already been freed. | |
e23ccc0a | 242 | */ |
2d86401c | 243 | static void __vb2_queue_free(struct vb2_queue *q, unsigned int buffers) |
e23ccc0a PO |
244 | { |
245 | unsigned int buffer; | |
246 | ||
247 | /* Call driver-provided cleanup function for each buffer, if provided */ | |
248 | if (q->ops->buf_cleanup) { | |
2d86401c GL |
249 | for (buffer = q->num_buffers - buffers; buffer < q->num_buffers; |
250 | ++buffer) { | |
e23ccc0a PO |
251 | if (NULL == q->bufs[buffer]) |
252 | continue; | |
253 | q->ops->buf_cleanup(q->bufs[buffer]); | |
254 | } | |
255 | } | |
256 | ||
257 | /* Release video buffer memory */ | |
2d86401c | 258 | __vb2_free_mem(q, buffers); |
e23ccc0a PO |
259 | |
260 | /* Free videobuf buffers */ | |
2d86401c GL |
261 | for (buffer = q->num_buffers - buffers; buffer < q->num_buffers; |
262 | ++buffer) { | |
e23ccc0a PO |
263 | kfree(q->bufs[buffer]); |
264 | q->bufs[buffer] = NULL; | |
265 | } | |
266 | ||
2d86401c GL |
267 | q->num_buffers -= buffers; |
268 | if (!q->num_buffers) | |
269 | q->memory = 0; | |
bd50d999 | 270 | INIT_LIST_HEAD(&q->queued_list); |
e23ccc0a PO |
271 | } |
272 | ||
273 | /** | |
274 | * __verify_planes_array() - verify that the planes array passed in struct | |
275 | * v4l2_buffer from userspace can be safely used | |
276 | */ | |
2d86401c | 277 | static int __verify_planes_array(struct vb2_buffer *vb, const struct v4l2_buffer *b) |
e23ccc0a PO |
278 | { |
279 | /* Is memory for copying plane information present? */ | |
280 | if (NULL == b->m.planes) { | |
281 | dprintk(1, "Multi-planar buffer passed but " | |
282 | "planes array not provided\n"); | |
283 | return -EINVAL; | |
284 | } | |
285 | ||
286 | if (b->length < vb->num_planes || b->length > VIDEO_MAX_PLANES) { | |
287 | dprintk(1, "Incorrect planes array length, " | |
288 | "expected %d, got %d\n", vb->num_planes, b->length); | |
289 | return -EINVAL; | |
290 | } | |
291 | ||
292 | return 0; | |
293 | } | |
294 | ||
25a27d91 MS |
295 | /** |
296 | * __buffer_in_use() - return true if the buffer is in use and | |
297 | * the queue cannot be freed (by the means of REQBUFS(0)) call | |
298 | */ | |
299 | static bool __buffer_in_use(struct vb2_queue *q, struct vb2_buffer *vb) | |
300 | { | |
301 | unsigned int plane; | |
302 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
2c2dd6ac | 303 | void *mem_priv = vb->planes[plane].mem_priv; |
25a27d91 MS |
304 | /* |
305 | * If num_users() has not been provided, call_memop | |
306 | * will return 0, apparently nobody cares about this | |
307 | * case anyway. If num_users() returns more than 1, | |
308 | * we are not the only user of the plane's memory. | |
309 | */ | |
5931ffe3 | 310 | if (mem_priv && call_memop(q, num_users, mem_priv) > 1) |
25a27d91 MS |
311 | return true; |
312 | } | |
313 | return false; | |
314 | } | |
315 | ||
316 | /** | |
317 | * __buffers_in_use() - return true if any buffers on the queue are in use and | |
318 | * the queue cannot be freed (by the means of REQBUFS(0)) call | |
319 | */ | |
320 | static bool __buffers_in_use(struct vb2_queue *q) | |
321 | { | |
322 | unsigned int buffer; | |
323 | for (buffer = 0; buffer < q->num_buffers; ++buffer) { | |
324 | if (__buffer_in_use(q, q->bufs[buffer])) | |
325 | return true; | |
326 | } | |
327 | return false; | |
328 | } | |
329 | ||
e23ccc0a PO |
330 | /** |
331 | * __fill_v4l2_buffer() - fill in a struct v4l2_buffer with information to be | |
332 | * returned to userspace | |
333 | */ | |
334 | static int __fill_v4l2_buffer(struct vb2_buffer *vb, struct v4l2_buffer *b) | |
335 | { | |
336 | struct vb2_queue *q = vb->vb2_queue; | |
2d86401c | 337 | int ret; |
e23ccc0a | 338 | |
2b719d7b | 339 | /* Copy back data such as timestamp, flags, etc. */ |
e23ccc0a | 340 | memcpy(b, &vb->v4l2_buf, offsetof(struct v4l2_buffer, m)); |
2b719d7b | 341 | b->reserved2 = vb->v4l2_buf.reserved2; |
e23ccc0a PO |
342 | b->reserved = vb->v4l2_buf.reserved; |
343 | ||
344 | if (V4L2_TYPE_IS_MULTIPLANAR(q->type)) { | |
345 | ret = __verify_planes_array(vb, b); | |
346 | if (ret) | |
347 | return ret; | |
348 | ||
349 | /* | |
350 | * Fill in plane-related data if userspace provided an array | |
351 | * for it. The memory and size is verified above. | |
352 | */ | |
353 | memcpy(b->m.planes, vb->v4l2_planes, | |
354 | b->length * sizeof(struct v4l2_plane)); | |
355 | } else { | |
356 | /* | |
357 | * We use length and offset in v4l2_planes array even for | |
358 | * single-planar buffers, but userspace does not. | |
359 | */ | |
360 | b->length = vb->v4l2_planes[0].length; | |
361 | b->bytesused = vb->v4l2_planes[0].bytesused; | |
362 | if (q->memory == V4L2_MEMORY_MMAP) | |
363 | b->m.offset = vb->v4l2_planes[0].m.mem_offset; | |
364 | else if (q->memory == V4L2_MEMORY_USERPTR) | |
365 | b->m.userptr = vb->v4l2_planes[0].m.userptr; | |
366 | } | |
367 | ||
ea42c8ec MS |
368 | /* |
369 | * Clear any buffer state related flags. | |
370 | */ | |
371 | b->flags &= ~V4L2_BUFFER_STATE_FLAGS; | |
e23ccc0a PO |
372 | |
373 | switch (vb->state) { | |
374 | case VB2_BUF_STATE_QUEUED: | |
375 | case VB2_BUF_STATE_ACTIVE: | |
376 | b->flags |= V4L2_BUF_FLAG_QUEUED; | |
377 | break; | |
378 | case VB2_BUF_STATE_ERROR: | |
379 | b->flags |= V4L2_BUF_FLAG_ERROR; | |
380 | /* fall through */ | |
381 | case VB2_BUF_STATE_DONE: | |
382 | b->flags |= V4L2_BUF_FLAG_DONE; | |
383 | break; | |
ebc087d0 | 384 | case VB2_BUF_STATE_PREPARED: |
2d86401c GL |
385 | b->flags |= V4L2_BUF_FLAG_PREPARED; |
386 | break; | |
387 | case VB2_BUF_STATE_DEQUEUED: | |
e23ccc0a PO |
388 | /* nothing */ |
389 | break; | |
390 | } | |
391 | ||
25a27d91 | 392 | if (__buffer_in_use(q, vb)) |
e23ccc0a PO |
393 | b->flags |= V4L2_BUF_FLAG_MAPPED; |
394 | ||
2d86401c | 395 | return 0; |
e23ccc0a PO |
396 | } |
397 | ||
398 | /** | |
399 | * vb2_querybuf() - query video buffer information | |
400 | * @q: videobuf queue | |
401 | * @b: buffer struct passed from userspace to vidioc_querybuf handler | |
402 | * in driver | |
403 | * | |
404 | * Should be called from vidioc_querybuf ioctl handler in driver. | |
405 | * This function will verify the passed v4l2_buffer structure and fill the | |
406 | * relevant information for the userspace. | |
407 | * | |
408 | * The return values from this function are intended to be directly returned | |
409 | * from vidioc_querybuf handler in driver. | |
410 | */ | |
411 | int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b) | |
412 | { | |
413 | struct vb2_buffer *vb; | |
414 | ||
415 | if (b->type != q->type) { | |
416 | dprintk(1, "querybuf: wrong buffer type\n"); | |
417 | return -EINVAL; | |
418 | } | |
419 | ||
420 | if (b->index >= q->num_buffers) { | |
421 | dprintk(1, "querybuf: buffer index out of range\n"); | |
422 | return -EINVAL; | |
423 | } | |
424 | vb = q->bufs[b->index]; | |
425 | ||
426 | return __fill_v4l2_buffer(vb, b); | |
427 | } | |
428 | EXPORT_SYMBOL(vb2_querybuf); | |
429 | ||
430 | /** | |
431 | * __verify_userptr_ops() - verify that all memory operations required for | |
432 | * USERPTR queue type have been provided | |
433 | */ | |
434 | static int __verify_userptr_ops(struct vb2_queue *q) | |
435 | { | |
436 | if (!(q->io_modes & VB2_USERPTR) || !q->mem_ops->get_userptr || | |
437 | !q->mem_ops->put_userptr) | |
438 | return -EINVAL; | |
439 | ||
440 | return 0; | |
441 | } | |
442 | ||
443 | /** | |
444 | * __verify_mmap_ops() - verify that all memory operations required for | |
445 | * MMAP queue type have been provided | |
446 | */ | |
447 | static int __verify_mmap_ops(struct vb2_queue *q) | |
448 | { | |
449 | if (!(q->io_modes & VB2_MMAP) || !q->mem_ops->alloc || | |
450 | !q->mem_ops->put || !q->mem_ops->mmap) | |
451 | return -EINVAL; | |
452 | ||
453 | return 0; | |
454 | } | |
455 | ||
e23ccc0a | 456 | /** |
37d9ed94 HV |
457 | * __verify_memory_type() - Check whether the memory type and buffer type |
458 | * passed to a buffer operation are compatible with the queue. | |
459 | */ | |
460 | static int __verify_memory_type(struct vb2_queue *q, | |
461 | enum v4l2_memory memory, enum v4l2_buf_type type) | |
462 | { | |
463 | if (memory != V4L2_MEMORY_MMAP && memory != V4L2_MEMORY_USERPTR) { | |
464 | dprintk(1, "reqbufs: unsupported memory type\n"); | |
465 | return -EINVAL; | |
466 | } | |
467 | ||
468 | if (type != q->type) { | |
469 | dprintk(1, "reqbufs: requested type is incorrect\n"); | |
470 | return -EINVAL; | |
471 | } | |
472 | ||
473 | /* | |
474 | * Make sure all the required memory ops for given memory type | |
475 | * are available. | |
476 | */ | |
477 | if (memory == V4L2_MEMORY_MMAP && __verify_mmap_ops(q)) { | |
478 | dprintk(1, "reqbufs: MMAP for current setup unsupported\n"); | |
479 | return -EINVAL; | |
480 | } | |
481 | ||
482 | if (memory == V4L2_MEMORY_USERPTR && __verify_userptr_ops(q)) { | |
483 | dprintk(1, "reqbufs: USERPTR for current setup unsupported\n"); | |
484 | return -EINVAL; | |
485 | } | |
486 | ||
487 | /* | |
488 | * Place the busy tests at the end: -EBUSY can be ignored when | |
489 | * create_bufs is called with count == 0, but count == 0 should still | |
490 | * do the memory and type validation. | |
491 | */ | |
492 | if (q->fileio) { | |
493 | dprintk(1, "reqbufs: file io in progress\n"); | |
494 | return -EBUSY; | |
495 | } | |
496 | return 0; | |
497 | } | |
498 | ||
499 | /** | |
500 | * __reqbufs() - Initiate streaming | |
e23ccc0a PO |
501 | * @q: videobuf2 queue |
502 | * @req: struct passed from userspace to vidioc_reqbufs handler in driver | |
503 | * | |
504 | * Should be called from vidioc_reqbufs ioctl handler of a driver. | |
505 | * This function: | |
506 | * 1) verifies streaming parameters passed from the userspace, | |
507 | * 2) sets up the queue, | |
508 | * 3) negotiates number of buffers and planes per buffer with the driver | |
509 | * to be used during streaming, | |
510 | * 4) allocates internal buffer structures (struct vb2_buffer), according to | |
511 | * the agreed parameters, | |
512 | * 5) for MMAP memory type, allocates actual video memory, using the | |
513 | * memory handling/allocation routines provided during queue initialization | |
514 | * | |
515 | * If req->count is 0, all the memory will be freed instead. | |
516 | * If the queue has been allocated previously (by a previous vb2_reqbufs) call | |
517 | * and the queue is not busy, memory will be reallocated. | |
518 | * | |
519 | * The return values from this function are intended to be directly returned | |
520 | * from vidioc_reqbufs handler in driver. | |
521 | */ | |
37d9ed94 | 522 | static int __reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req) |
e23ccc0a | 523 | { |
2d86401c | 524 | unsigned int num_buffers, allocated_buffers, num_planes = 0; |
37d9ed94 | 525 | int ret; |
e23ccc0a PO |
526 | |
527 | if (q->streaming) { | |
528 | dprintk(1, "reqbufs: streaming active\n"); | |
529 | return -EBUSY; | |
530 | } | |
531 | ||
29e3fbd8 | 532 | if (req->count == 0 || q->num_buffers != 0 || q->memory != req->memory) { |
e23ccc0a PO |
533 | /* |
534 | * We already have buffers allocated, so first check if they | |
535 | * are not in use and can be freed. | |
536 | */ | |
537 | if (q->memory == V4L2_MEMORY_MMAP && __buffers_in_use(q)) { | |
538 | dprintk(1, "reqbufs: memory in use, cannot free\n"); | |
539 | return -EBUSY; | |
540 | } | |
541 | ||
2d86401c | 542 | __vb2_queue_free(q, q->num_buffers); |
29e3fbd8 MS |
543 | |
544 | /* | |
545 | * In case of REQBUFS(0) return immediately without calling | |
546 | * driver's queue_setup() callback and allocating resources. | |
547 | */ | |
548 | if (req->count == 0) | |
549 | return 0; | |
e23ccc0a PO |
550 | } |
551 | ||
552 | /* | |
553 | * Make sure the requested values and current defaults are sane. | |
554 | */ | |
555 | num_buffers = min_t(unsigned int, req->count, VIDEO_MAX_FRAME); | |
c1426bc7 | 556 | memset(q->plane_sizes, 0, sizeof(q->plane_sizes)); |
e23ccc0a | 557 | memset(q->alloc_ctx, 0, sizeof(q->alloc_ctx)); |
13b14095 | 558 | q->memory = req->memory; |
e23ccc0a PO |
559 | |
560 | /* | |
561 | * Ask the driver how many buffers and planes per buffer it requires. | |
562 | * Driver also sets the size and allocator context for each plane. | |
563 | */ | |
fc714e70 | 564 | ret = call_qop(q, queue_setup, q, NULL, &num_buffers, &num_planes, |
c1426bc7 | 565 | q->plane_sizes, q->alloc_ctx); |
e23ccc0a PO |
566 | if (ret) |
567 | return ret; | |
568 | ||
569 | /* Finally, allocate buffers and video memory */ | |
c1426bc7 | 570 | ret = __vb2_queue_alloc(q, req->memory, num_buffers, num_planes); |
66072d4f MS |
571 | if (ret == 0) { |
572 | dprintk(1, "Memory allocation failed\n"); | |
573 | return -ENOMEM; | |
e23ccc0a PO |
574 | } |
575 | ||
2d86401c GL |
576 | allocated_buffers = ret; |
577 | ||
e23ccc0a PO |
578 | /* |
579 | * Check if driver can handle the allocated number of buffers. | |
580 | */ | |
2d86401c GL |
581 | if (allocated_buffers < num_buffers) { |
582 | num_buffers = allocated_buffers; | |
e23ccc0a | 583 | |
fc714e70 GL |
584 | ret = call_qop(q, queue_setup, q, NULL, &num_buffers, |
585 | &num_planes, q->plane_sizes, q->alloc_ctx); | |
e23ccc0a | 586 | |
2d86401c | 587 | if (!ret && allocated_buffers < num_buffers) |
e23ccc0a | 588 | ret = -ENOMEM; |
e23ccc0a PO |
589 | |
590 | /* | |
2d86401c GL |
591 | * Either the driver has accepted a smaller number of buffers, |
592 | * or .queue_setup() returned an error | |
e23ccc0a | 593 | */ |
2d86401c GL |
594 | } |
595 | ||
596 | q->num_buffers = allocated_buffers; | |
597 | ||
598 | if (ret < 0) { | |
599 | __vb2_queue_free(q, allocated_buffers); | |
600 | return ret; | |
e23ccc0a PO |
601 | } |
602 | ||
e23ccc0a PO |
603 | /* |
604 | * Return the number of successfully allocated buffers | |
605 | * to the userspace. | |
606 | */ | |
2d86401c | 607 | req->count = allocated_buffers; |
e23ccc0a PO |
608 | |
609 | return 0; | |
e23ccc0a | 610 | } |
37d9ed94 HV |
611 | |
612 | /** | |
613 | * vb2_reqbufs() - Wrapper for __reqbufs() that also verifies the memory and | |
614 | * type values. | |
615 | * @q: videobuf2 queue | |
616 | * @req: struct passed from userspace to vidioc_reqbufs handler in driver | |
617 | */ | |
618 | int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req) | |
619 | { | |
620 | int ret = __verify_memory_type(q, req->memory, req->type); | |
621 | ||
622 | return ret ? ret : __reqbufs(q, req); | |
623 | } | |
e23ccc0a PO |
624 | EXPORT_SYMBOL_GPL(vb2_reqbufs); |
625 | ||
2d86401c | 626 | /** |
37d9ed94 | 627 | * __create_bufs() - Allocate buffers and any required auxiliary structs |
2d86401c GL |
628 | * @q: videobuf2 queue |
629 | * @create: creation parameters, passed from userspace to vidioc_create_bufs | |
630 | * handler in driver | |
631 | * | |
632 | * Should be called from vidioc_create_bufs ioctl handler of a driver. | |
633 | * This function: | |
634 | * 1) verifies parameter sanity | |
635 | * 2) calls the .queue_setup() queue operation | |
636 | * 3) performs any necessary memory allocations | |
637 | * | |
638 | * The return values from this function are intended to be directly returned | |
639 | * from vidioc_create_bufs handler in driver. | |
640 | */ | |
37d9ed94 | 641 | static int __create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) |
2d86401c GL |
642 | { |
643 | unsigned int num_planes = 0, num_buffers, allocated_buffers; | |
37d9ed94 | 644 | int ret; |
2d86401c GL |
645 | |
646 | if (q->num_buffers == VIDEO_MAX_FRAME) { | |
647 | dprintk(1, "%s(): maximum number of buffers already allocated\n", | |
648 | __func__); | |
649 | return -ENOBUFS; | |
650 | } | |
651 | ||
2d86401c GL |
652 | if (!q->num_buffers) { |
653 | memset(q->plane_sizes, 0, sizeof(q->plane_sizes)); | |
654 | memset(q->alloc_ctx, 0, sizeof(q->alloc_ctx)); | |
655 | q->memory = create->memory; | |
656 | } | |
657 | ||
658 | num_buffers = min(create->count, VIDEO_MAX_FRAME - q->num_buffers); | |
659 | ||
660 | /* | |
661 | * Ask the driver, whether the requested number of buffers, planes per | |
662 | * buffer and their sizes are acceptable | |
663 | */ | |
664 | ret = call_qop(q, queue_setup, q, &create->format, &num_buffers, | |
665 | &num_planes, q->plane_sizes, q->alloc_ctx); | |
666 | if (ret) | |
667 | return ret; | |
668 | ||
669 | /* Finally, allocate buffers and video memory */ | |
670 | ret = __vb2_queue_alloc(q, create->memory, num_buffers, | |
671 | num_planes); | |
f05393d2 HV |
672 | if (ret == 0) { |
673 | dprintk(1, "Memory allocation failed\n"); | |
674 | return -ENOMEM; | |
2d86401c GL |
675 | } |
676 | ||
677 | allocated_buffers = ret; | |
678 | ||
679 | /* | |
680 | * Check if driver can handle the so far allocated number of buffers. | |
681 | */ | |
682 | if (ret < num_buffers) { | |
683 | num_buffers = ret; | |
684 | ||
685 | /* | |
686 | * q->num_buffers contains the total number of buffers, that the | |
687 | * queue driver has set up | |
688 | */ | |
689 | ret = call_qop(q, queue_setup, q, &create->format, &num_buffers, | |
690 | &num_planes, q->plane_sizes, q->alloc_ctx); | |
691 | ||
692 | if (!ret && allocated_buffers < num_buffers) | |
693 | ret = -ENOMEM; | |
694 | ||
695 | /* | |
696 | * Either the driver has accepted a smaller number of buffers, | |
697 | * or .queue_setup() returned an error | |
698 | */ | |
699 | } | |
700 | ||
701 | q->num_buffers += allocated_buffers; | |
702 | ||
703 | if (ret < 0) { | |
704 | __vb2_queue_free(q, allocated_buffers); | |
f05393d2 | 705 | return -ENOMEM; |
2d86401c GL |
706 | } |
707 | ||
708 | /* | |
709 | * Return the number of successfully allocated buffers | |
710 | * to the userspace. | |
711 | */ | |
712 | create->count = allocated_buffers; | |
713 | ||
714 | return 0; | |
715 | } | |
37d9ed94 HV |
716 | |
717 | /** | |
53aa3b19 NT |
718 | * vb2_create_bufs() - Wrapper for __create_bufs() that also verifies the |
719 | * memory and type values. | |
37d9ed94 HV |
720 | * @q: videobuf2 queue |
721 | * @create: creation parameters, passed from userspace to vidioc_create_bufs | |
722 | * handler in driver | |
723 | */ | |
724 | int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) | |
725 | { | |
726 | int ret = __verify_memory_type(q, create->memory, create->format.type); | |
727 | ||
728 | create->index = q->num_buffers; | |
f05393d2 HV |
729 | if (create->count == 0) |
730 | return ret != -EBUSY ? ret : 0; | |
37d9ed94 HV |
731 | return ret ? ret : __create_bufs(q, create); |
732 | } | |
2d86401c GL |
733 | EXPORT_SYMBOL_GPL(vb2_create_bufs); |
734 | ||
e23ccc0a PO |
735 | /** |
736 | * vb2_plane_vaddr() - Return a kernel virtual address of a given plane | |
737 | * @vb: vb2_buffer to which the plane in question belongs to | |
738 | * @plane_no: plane number for which the address is to be returned | |
739 | * | |
740 | * This function returns a kernel virtual address of a given plane if | |
741 | * such a mapping exist, NULL otherwise. | |
742 | */ | |
743 | void *vb2_plane_vaddr(struct vb2_buffer *vb, unsigned int plane_no) | |
744 | { | |
745 | struct vb2_queue *q = vb->vb2_queue; | |
746 | ||
a00d0266 | 747 | if (plane_no > vb->num_planes || !vb->planes[plane_no].mem_priv) |
e23ccc0a PO |
748 | return NULL; |
749 | ||
5931ffe3 | 750 | return call_memop(q, vaddr, vb->planes[plane_no].mem_priv); |
e23ccc0a PO |
751 | |
752 | } | |
753 | EXPORT_SYMBOL_GPL(vb2_plane_vaddr); | |
754 | ||
755 | /** | |
756 | * vb2_plane_cookie() - Return allocator specific cookie for the given plane | |
757 | * @vb: vb2_buffer to which the plane in question belongs to | |
758 | * @plane_no: plane number for which the cookie is to be returned | |
759 | * | |
760 | * This function returns an allocator specific cookie for a given plane if | |
761 | * available, NULL otherwise. The allocator should provide some simple static | |
762 | * inline function, which would convert this cookie to the allocator specific | |
763 | * type that can be used directly by the driver to access the buffer. This can | |
764 | * be for example physical address, pointer to scatter list or IOMMU mapping. | |
765 | */ | |
766 | void *vb2_plane_cookie(struct vb2_buffer *vb, unsigned int plane_no) | |
767 | { | |
768 | struct vb2_queue *q = vb->vb2_queue; | |
769 | ||
a00d0266 | 770 | if (plane_no > vb->num_planes || !vb->planes[plane_no].mem_priv) |
e23ccc0a PO |
771 | return NULL; |
772 | ||
5931ffe3 | 773 | return call_memop(q, cookie, vb->planes[plane_no].mem_priv); |
e23ccc0a PO |
774 | } |
775 | EXPORT_SYMBOL_GPL(vb2_plane_cookie); | |
776 | ||
777 | /** | |
778 | * vb2_buffer_done() - inform videobuf that an operation on a buffer is finished | |
779 | * @vb: vb2_buffer returned from the driver | |
780 | * @state: either VB2_BUF_STATE_DONE if the operation finished successfully | |
781 | * or VB2_BUF_STATE_ERROR if the operation finished with an error | |
782 | * | |
783 | * This function should be called by the driver after a hardware operation on | |
784 | * a buffer is finished and the buffer may be returned to userspace. The driver | |
785 | * cannot use this buffer anymore until it is queued back to it by videobuf | |
786 | * by the means of buf_queue callback. Only buffers previously queued to the | |
787 | * driver by buf_queue can be passed to this function. | |
788 | */ | |
789 | void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state) | |
790 | { | |
791 | struct vb2_queue *q = vb->vb2_queue; | |
792 | unsigned long flags; | |
793 | ||
794 | if (vb->state != VB2_BUF_STATE_ACTIVE) | |
795 | return; | |
796 | ||
797 | if (state != VB2_BUF_STATE_DONE && state != VB2_BUF_STATE_ERROR) | |
798 | return; | |
799 | ||
800 | dprintk(4, "Done processing on buffer %d, state: %d\n", | |
801 | vb->v4l2_buf.index, vb->state); | |
802 | ||
803 | /* Add the buffer to the done buffers list */ | |
804 | spin_lock_irqsave(&q->done_lock, flags); | |
805 | vb->state = state; | |
806 | list_add_tail(&vb->done_entry, &q->done_list); | |
807 | atomic_dec(&q->queued_count); | |
808 | spin_unlock_irqrestore(&q->done_lock, flags); | |
809 | ||
810 | /* Inform any processes that may be waiting for buffers */ | |
811 | wake_up(&q->done_wq); | |
812 | } | |
813 | EXPORT_SYMBOL_GPL(vb2_buffer_done); | |
814 | ||
815 | /** | |
816 | * __fill_vb2_buffer() - fill a vb2_buffer with information provided in | |
817 | * a v4l2_buffer by the userspace | |
818 | */ | |
2d86401c | 819 | static int __fill_vb2_buffer(struct vb2_buffer *vb, const struct v4l2_buffer *b, |
e23ccc0a PO |
820 | struct v4l2_plane *v4l2_planes) |
821 | { | |
822 | unsigned int plane; | |
823 | int ret; | |
824 | ||
825 | if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) { | |
826 | /* | |
827 | * Verify that the userspace gave us a valid array for | |
828 | * plane information. | |
829 | */ | |
830 | ret = __verify_planes_array(vb, b); | |
831 | if (ret) | |
832 | return ret; | |
833 | ||
834 | /* Fill in driver-provided information for OUTPUT types */ | |
835 | if (V4L2_TYPE_IS_OUTPUT(b->type)) { | |
836 | /* | |
837 | * Will have to go up to b->length when API starts | |
838 | * accepting variable number of planes. | |
839 | */ | |
840 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
841 | v4l2_planes[plane].bytesused = | |
842 | b->m.planes[plane].bytesused; | |
843 | v4l2_planes[plane].data_offset = | |
844 | b->m.planes[plane].data_offset; | |
845 | } | |
846 | } | |
847 | ||
848 | if (b->memory == V4L2_MEMORY_USERPTR) { | |
849 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
850 | v4l2_planes[plane].m.userptr = | |
851 | b->m.planes[plane].m.userptr; | |
852 | v4l2_planes[plane].length = | |
853 | b->m.planes[plane].length; | |
854 | } | |
855 | } | |
856 | } else { | |
857 | /* | |
858 | * Single-planar buffers do not use planes array, | |
859 | * so fill in relevant v4l2_buffer struct fields instead. | |
860 | * In videobuf we use our internal V4l2_planes struct for | |
861 | * single-planar buffers as well, for simplicity. | |
862 | */ | |
863 | if (V4L2_TYPE_IS_OUTPUT(b->type)) | |
864 | v4l2_planes[0].bytesused = b->bytesused; | |
865 | ||
866 | if (b->memory == V4L2_MEMORY_USERPTR) { | |
867 | v4l2_planes[0].m.userptr = b->m.userptr; | |
868 | v4l2_planes[0].length = b->length; | |
869 | } | |
870 | } | |
871 | ||
872 | vb->v4l2_buf.field = b->field; | |
873 | vb->v4l2_buf.timestamp = b->timestamp; | |
ea42c8ec | 874 | vb->v4l2_buf.flags = b->flags & ~V4L2_BUFFER_STATE_FLAGS; |
e23ccc0a PO |
875 | |
876 | return 0; | |
877 | } | |
878 | ||
879 | /** | |
880 | * __qbuf_userptr() - handle qbuf of a USERPTR buffer | |
881 | */ | |
2d86401c | 882 | static int __qbuf_userptr(struct vb2_buffer *vb, const struct v4l2_buffer *b) |
e23ccc0a PO |
883 | { |
884 | struct v4l2_plane planes[VIDEO_MAX_PLANES]; | |
885 | struct vb2_queue *q = vb->vb2_queue; | |
886 | void *mem_priv; | |
887 | unsigned int plane; | |
888 | int ret; | |
889 | int write = !V4L2_TYPE_IS_OUTPUT(q->type); | |
890 | ||
891 | /* Verify and copy relevant information provided by the userspace */ | |
892 | ret = __fill_vb2_buffer(vb, b, planes); | |
893 | if (ret) | |
894 | return ret; | |
895 | ||
896 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
897 | /* Skip the plane if already verified */ | |
f0b7c7fc MS |
898 | if (vb->v4l2_planes[plane].m.userptr && |
899 | vb->v4l2_planes[plane].m.userptr == planes[plane].m.userptr | |
e23ccc0a PO |
900 | && vb->v4l2_planes[plane].length == planes[plane].length) |
901 | continue; | |
902 | ||
903 | dprintk(3, "qbuf: userspace address for plane %d changed, " | |
904 | "reacquiring memory\n", plane); | |
905 | ||
c1426bc7 MS |
906 | /* Check if the provided plane buffer is large enough */ |
907 | if (planes[plane].length < q->plane_sizes[plane]) { | |
4c2625db | 908 | ret = -EINVAL; |
c1426bc7 MS |
909 | goto err; |
910 | } | |
911 | ||
e23ccc0a PO |
912 | /* Release previously acquired memory if present */ |
913 | if (vb->planes[plane].mem_priv) | |
5931ffe3 | 914 | call_memop(q, put_userptr, vb->planes[plane].mem_priv); |
e23ccc0a PO |
915 | |
916 | vb->planes[plane].mem_priv = NULL; | |
c1426bc7 MS |
917 | vb->v4l2_planes[plane].m.userptr = 0; |
918 | vb->v4l2_planes[plane].length = 0; | |
e23ccc0a PO |
919 | |
920 | /* Acquire each plane's memory */ | |
a00d0266 MS |
921 | mem_priv = call_memop(q, get_userptr, q->alloc_ctx[plane], |
922 | planes[plane].m.userptr, | |
923 | planes[plane].length, write); | |
924 | if (IS_ERR_OR_NULL(mem_priv)) { | |
925 | dprintk(1, "qbuf: failed acquiring userspace " | |
e23ccc0a | 926 | "memory for plane %d\n", plane); |
a00d0266 MS |
927 | ret = mem_priv ? PTR_ERR(mem_priv) : -EINVAL; |
928 | goto err; | |
e23ccc0a | 929 | } |
a00d0266 | 930 | vb->planes[plane].mem_priv = mem_priv; |
e23ccc0a PO |
931 | } |
932 | ||
933 | /* | |
934 | * Call driver-specific initialization on the newly acquired buffer, | |
935 | * if provided. | |
936 | */ | |
937 | ret = call_qop(q, buf_init, vb); | |
938 | if (ret) { | |
939 | dprintk(1, "qbuf: buffer initialization failed\n"); | |
940 | goto err; | |
941 | } | |
942 | ||
943 | /* | |
944 | * Now that everything is in order, copy relevant information | |
945 | * provided by userspace. | |
946 | */ | |
947 | for (plane = 0; plane < vb->num_planes; ++plane) | |
948 | vb->v4l2_planes[plane] = planes[plane]; | |
949 | ||
950 | return 0; | |
951 | err: | |
952 | /* In case of errors, release planes that were already acquired */ | |
c1426bc7 MS |
953 | for (plane = 0; plane < vb->num_planes; ++plane) { |
954 | if (vb->planes[plane].mem_priv) | |
5931ffe3 | 955 | call_memop(q, put_userptr, vb->planes[plane].mem_priv); |
c1426bc7 MS |
956 | vb->planes[plane].mem_priv = NULL; |
957 | vb->v4l2_planes[plane].m.userptr = 0; | |
958 | vb->v4l2_planes[plane].length = 0; | |
e23ccc0a PO |
959 | } |
960 | ||
961 | return ret; | |
962 | } | |
963 | ||
964 | /** | |
965 | * __qbuf_mmap() - handle qbuf of an MMAP buffer | |
966 | */ | |
2d86401c | 967 | static int __qbuf_mmap(struct vb2_buffer *vb, const struct v4l2_buffer *b) |
e23ccc0a PO |
968 | { |
969 | return __fill_vb2_buffer(vb, b, vb->v4l2_planes); | |
970 | } | |
971 | ||
972 | /** | |
973 | * __enqueue_in_driver() - enqueue a vb2_buffer in driver for processing | |
974 | */ | |
975 | static void __enqueue_in_driver(struct vb2_buffer *vb) | |
976 | { | |
977 | struct vb2_queue *q = vb->vb2_queue; | |
978 | ||
979 | vb->state = VB2_BUF_STATE_ACTIVE; | |
980 | atomic_inc(&q->queued_count); | |
981 | q->ops->buf_queue(vb); | |
982 | } | |
983 | ||
2d86401c | 984 | static int __buf_prepare(struct vb2_buffer *vb, const struct v4l2_buffer *b) |
ebc087d0 GL |
985 | { |
986 | struct vb2_queue *q = vb->vb2_queue; | |
987 | int ret; | |
988 | ||
989 | switch (q->memory) { | |
990 | case V4L2_MEMORY_MMAP: | |
991 | ret = __qbuf_mmap(vb, b); | |
992 | break; | |
993 | case V4L2_MEMORY_USERPTR: | |
994 | ret = __qbuf_userptr(vb, b); | |
995 | break; | |
996 | default: | |
997 | WARN(1, "Invalid queue type\n"); | |
998 | ret = -EINVAL; | |
999 | } | |
1000 | ||
1001 | if (!ret) | |
1002 | ret = call_qop(q, buf_prepare, vb); | |
1003 | if (ret) | |
1004 | dprintk(1, "qbuf: buffer preparation failed: %d\n", ret); | |
1005 | else | |
1006 | vb->state = VB2_BUF_STATE_PREPARED; | |
1007 | ||
1008 | return ret; | |
1009 | } | |
1010 | ||
2d86401c GL |
1011 | /** |
1012 | * vb2_prepare_buf() - Pass ownership of a buffer from userspace to the kernel | |
1013 | * @q: videobuf2 queue | |
1014 | * @b: buffer structure passed from userspace to vidioc_prepare_buf | |
1015 | * handler in driver | |
1016 | * | |
1017 | * Should be called from vidioc_prepare_buf ioctl handler of a driver. | |
1018 | * This function: | |
1019 | * 1) verifies the passed buffer, | |
1020 | * 2) calls buf_prepare callback in the driver (if provided), in which | |
1021 | * driver-specific buffer initialization can be performed, | |
1022 | * | |
1023 | * The return values from this function are intended to be directly returned | |
1024 | * from vidioc_prepare_buf handler in driver. | |
1025 | */ | |
1026 | int vb2_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b) | |
1027 | { | |
1028 | struct vb2_buffer *vb; | |
1029 | int ret; | |
1030 | ||
1031 | if (q->fileio) { | |
1032 | dprintk(1, "%s(): file io in progress\n", __func__); | |
1033 | return -EBUSY; | |
1034 | } | |
1035 | ||
1036 | if (b->type != q->type) { | |
1037 | dprintk(1, "%s(): invalid buffer type\n", __func__); | |
1038 | return -EINVAL; | |
1039 | } | |
1040 | ||
1041 | if (b->index >= q->num_buffers) { | |
1042 | dprintk(1, "%s(): buffer index out of range\n", __func__); | |
1043 | return -EINVAL; | |
1044 | } | |
1045 | ||
1046 | vb = q->bufs[b->index]; | |
1047 | if (NULL == vb) { | |
1048 | /* Should never happen */ | |
1049 | dprintk(1, "%s(): buffer is NULL\n", __func__); | |
1050 | return -EINVAL; | |
1051 | } | |
1052 | ||
1053 | if (b->memory != q->memory) { | |
1054 | dprintk(1, "%s(): invalid memory type\n", __func__); | |
1055 | return -EINVAL; | |
1056 | } | |
1057 | ||
1058 | if (vb->state != VB2_BUF_STATE_DEQUEUED) { | |
1059 | dprintk(1, "%s(): invalid buffer state %d\n", __func__, vb->state); | |
1060 | return -EINVAL; | |
1061 | } | |
1062 | ||
1063 | ret = __buf_prepare(vb, b); | |
1064 | if (ret < 0) | |
1065 | return ret; | |
1066 | ||
1067 | __fill_v4l2_buffer(vb, b); | |
1068 | ||
1069 | return 0; | |
1070 | } | |
1071 | EXPORT_SYMBOL_GPL(vb2_prepare_buf); | |
1072 | ||
e23ccc0a PO |
1073 | /** |
1074 | * vb2_qbuf() - Queue a buffer from userspace | |
1075 | * @q: videobuf2 queue | |
1076 | * @b: buffer structure passed from userspace to vidioc_qbuf handler | |
1077 | * in driver | |
1078 | * | |
1079 | * Should be called from vidioc_qbuf ioctl handler of a driver. | |
1080 | * This function: | |
1081 | * 1) verifies the passed buffer, | |
ebc087d0 GL |
1082 | * 2) if necessary, calls buf_prepare callback in the driver (if provided), in |
1083 | * which driver-specific buffer initialization can be performed, | |
e23ccc0a PO |
1084 | * 3) if streaming is on, queues the buffer in driver by the means of buf_queue |
1085 | * callback for processing. | |
1086 | * | |
1087 | * The return values from this function are intended to be directly returned | |
1088 | * from vidioc_qbuf handler in driver. | |
1089 | */ | |
1090 | int vb2_qbuf(struct vb2_queue *q, struct v4l2_buffer *b) | |
1091 | { | |
b037c0fd | 1092 | struct rw_semaphore *mmap_sem = NULL; |
e23ccc0a | 1093 | struct vb2_buffer *vb; |
b037c0fd MS |
1094 | int ret = 0; |
1095 | ||
1096 | /* | |
1097 | * In case of user pointer buffers vb2 allocator needs to get direct | |
1098 | * access to userspace pages. This requires getting read access on | |
1099 | * mmap semaphore in the current process structure. The same | |
1100 | * semaphore is taken before calling mmap operation, while both mmap | |
1101 | * and qbuf are called by the driver or v4l2 core with driver's lock | |
1102 | * held. To avoid a AB-BA deadlock (mmap_sem then driver's lock in | |
1103 | * mmap and driver's lock then mmap_sem in qbuf) the videobuf2 core | |
1104 | * release driver's lock, takes mmap_sem and then takes again driver's | |
1105 | * lock. | |
1106 | * | |
1107 | * To avoid race with other vb2 calls, which might be called after | |
1108 | * releasing driver's lock, this operation is performed at the | |
1109 | * beggining of qbuf processing. This way the queue status is | |
1110 | * consistent after getting driver's lock back. | |
1111 | */ | |
57e43cfb | 1112 | if (q->memory == V4L2_MEMORY_USERPTR) { |
b037c0fd MS |
1113 | mmap_sem = ¤t->mm->mmap_sem; |
1114 | call_qop(q, wait_prepare, q); | |
1115 | down_read(mmap_sem); | |
1116 | call_qop(q, wait_finish, q); | |
1117 | } | |
e23ccc0a | 1118 | |
b25748fe MS |
1119 | if (q->fileio) { |
1120 | dprintk(1, "qbuf: file io in progress\n"); | |
b037c0fd MS |
1121 | ret = -EBUSY; |
1122 | goto unlock; | |
b25748fe MS |
1123 | } |
1124 | ||
e23ccc0a PO |
1125 | if (b->type != q->type) { |
1126 | dprintk(1, "qbuf: invalid buffer type\n"); | |
b037c0fd MS |
1127 | ret = -EINVAL; |
1128 | goto unlock; | |
e23ccc0a PO |
1129 | } |
1130 | ||
1131 | if (b->index >= q->num_buffers) { | |
1132 | dprintk(1, "qbuf: buffer index out of range\n"); | |
b037c0fd MS |
1133 | ret = -EINVAL; |
1134 | goto unlock; | |
e23ccc0a PO |
1135 | } |
1136 | ||
1137 | vb = q->bufs[b->index]; | |
1138 | if (NULL == vb) { | |
1139 | /* Should never happen */ | |
1140 | dprintk(1, "qbuf: buffer is NULL\n"); | |
b037c0fd MS |
1141 | ret = -EINVAL; |
1142 | goto unlock; | |
e23ccc0a PO |
1143 | } |
1144 | ||
1145 | if (b->memory != q->memory) { | |
1146 | dprintk(1, "qbuf: invalid memory type\n"); | |
b037c0fd MS |
1147 | ret = -EINVAL; |
1148 | goto unlock; | |
e23ccc0a PO |
1149 | } |
1150 | ||
ebc087d0 GL |
1151 | switch (vb->state) { |
1152 | case VB2_BUF_STATE_DEQUEUED: | |
1153 | ret = __buf_prepare(vb, b); | |
1154 | if (ret) | |
b037c0fd | 1155 | goto unlock; |
ebc087d0 GL |
1156 | case VB2_BUF_STATE_PREPARED: |
1157 | break; | |
1158 | default: | |
e23ccc0a | 1159 | dprintk(1, "qbuf: buffer already in use\n"); |
b037c0fd MS |
1160 | ret = -EINVAL; |
1161 | goto unlock; | |
e23ccc0a PO |
1162 | } |
1163 | ||
e23ccc0a PO |
1164 | /* |
1165 | * Add to the queued buffers list, a buffer will stay on it until | |
1166 | * dequeued in dqbuf. | |
1167 | */ | |
1168 | list_add_tail(&vb->queued_entry, &q->queued_list); | |
1169 | vb->state = VB2_BUF_STATE_QUEUED; | |
1170 | ||
1171 | /* | |
1172 | * If already streaming, give the buffer to driver for processing. | |
1173 | * If not, the buffer will be given to driver on next streamon. | |
1174 | */ | |
1175 | if (q->streaming) | |
1176 | __enqueue_in_driver(vb); | |
1177 | ||
21db3e07 GL |
1178 | /* Fill buffer information for the userspace */ |
1179 | __fill_v4l2_buffer(vb, b); | |
1180 | ||
e23ccc0a | 1181 | dprintk(1, "qbuf of buffer %d succeeded\n", vb->v4l2_buf.index); |
b037c0fd MS |
1182 | unlock: |
1183 | if (mmap_sem) | |
1184 | up_read(mmap_sem); | |
1185 | return ret; | |
e23ccc0a PO |
1186 | } |
1187 | EXPORT_SYMBOL_GPL(vb2_qbuf); | |
1188 | ||
1189 | /** | |
1190 | * __vb2_wait_for_done_vb() - wait for a buffer to become available | |
1191 | * for dequeuing | |
1192 | * | |
1193 | * Will sleep if required for nonblocking == false. | |
1194 | */ | |
1195 | static int __vb2_wait_for_done_vb(struct vb2_queue *q, int nonblocking) | |
1196 | { | |
1197 | /* | |
1198 | * All operations on vb_done_list are performed under done_lock | |
1199 | * spinlock protection. However, buffers may be removed from | |
1200 | * it and returned to userspace only while holding both driver's | |
1201 | * lock and the done_lock spinlock. Thus we can be sure that as | |
1202 | * long as we hold the driver's lock, the list will remain not | |
1203 | * empty if list_empty() check succeeds. | |
1204 | */ | |
1205 | ||
1206 | for (;;) { | |
1207 | int ret; | |
1208 | ||
1209 | if (!q->streaming) { | |
1210 | dprintk(1, "Streaming off, will not wait for buffers\n"); | |
1211 | return -EINVAL; | |
1212 | } | |
1213 | ||
1214 | if (!list_empty(&q->done_list)) { | |
1215 | /* | |
1216 | * Found a buffer that we were waiting for. | |
1217 | */ | |
1218 | break; | |
1219 | } | |
1220 | ||
1221 | if (nonblocking) { | |
1222 | dprintk(1, "Nonblocking and no buffers to dequeue, " | |
1223 | "will not wait\n"); | |
1224 | return -EAGAIN; | |
1225 | } | |
1226 | ||
1227 | /* | |
1228 | * We are streaming and blocking, wait for another buffer to | |
1229 | * become ready or for streamoff. Driver's lock is released to | |
1230 | * allow streamoff or qbuf to be called while waiting. | |
1231 | */ | |
1232 | call_qop(q, wait_prepare, q); | |
1233 | ||
1234 | /* | |
1235 | * All locks have been released, it is safe to sleep now. | |
1236 | */ | |
1237 | dprintk(3, "Will sleep waiting for buffers\n"); | |
1238 | ret = wait_event_interruptible(q->done_wq, | |
1239 | !list_empty(&q->done_list) || !q->streaming); | |
1240 | ||
1241 | /* | |
1242 | * We need to reevaluate both conditions again after reacquiring | |
1243 | * the locks or return an error if one occurred. | |
1244 | */ | |
1245 | call_qop(q, wait_finish, q); | |
1246 | if (ret) | |
1247 | return ret; | |
1248 | } | |
1249 | return 0; | |
1250 | } | |
1251 | ||
1252 | /** | |
1253 | * __vb2_get_done_vb() - get a buffer ready for dequeuing | |
1254 | * | |
1255 | * Will sleep if required for nonblocking == false. | |
1256 | */ | |
1257 | static int __vb2_get_done_vb(struct vb2_queue *q, struct vb2_buffer **vb, | |
1258 | int nonblocking) | |
1259 | { | |
1260 | unsigned long flags; | |
1261 | int ret; | |
1262 | ||
1263 | /* | |
1264 | * Wait for at least one buffer to become available on the done_list. | |
1265 | */ | |
1266 | ret = __vb2_wait_for_done_vb(q, nonblocking); | |
1267 | if (ret) | |
1268 | return ret; | |
1269 | ||
1270 | /* | |
1271 | * Driver's lock has been held since we last verified that done_list | |
1272 | * is not empty, so no need for another list_empty(done_list) check. | |
1273 | */ | |
1274 | spin_lock_irqsave(&q->done_lock, flags); | |
1275 | *vb = list_first_entry(&q->done_list, struct vb2_buffer, done_entry); | |
1276 | list_del(&(*vb)->done_entry); | |
1277 | spin_unlock_irqrestore(&q->done_lock, flags); | |
1278 | ||
1279 | return 0; | |
1280 | } | |
1281 | ||
1282 | /** | |
1283 | * vb2_wait_for_all_buffers() - wait until all buffers are given back to vb2 | |
1284 | * @q: videobuf2 queue | |
1285 | * | |
1286 | * This function will wait until all buffers that have been given to the driver | |
1287 | * by buf_queue() are given back to vb2 with vb2_buffer_done(). It doesn't call | |
1288 | * wait_prepare, wait_finish pair. It is intended to be called with all locks | |
1289 | * taken, for example from stop_streaming() callback. | |
1290 | */ | |
1291 | int vb2_wait_for_all_buffers(struct vb2_queue *q) | |
1292 | { | |
1293 | if (!q->streaming) { | |
1294 | dprintk(1, "Streaming off, will not wait for buffers\n"); | |
1295 | return -EINVAL; | |
1296 | } | |
1297 | ||
1298 | wait_event(q->done_wq, !atomic_read(&q->queued_count)); | |
1299 | return 0; | |
1300 | } | |
1301 | EXPORT_SYMBOL_GPL(vb2_wait_for_all_buffers); | |
1302 | ||
1303 | /** | |
1304 | * vb2_dqbuf() - Dequeue a buffer to the userspace | |
1305 | * @q: videobuf2 queue | |
1306 | * @b: buffer structure passed from userspace to vidioc_dqbuf handler | |
1307 | * in driver | |
1308 | * @nonblocking: if true, this call will not sleep waiting for a buffer if no | |
1309 | * buffers ready for dequeuing are present. Normally the driver | |
1310 | * would be passing (file->f_flags & O_NONBLOCK) here | |
1311 | * | |
1312 | * Should be called from vidioc_dqbuf ioctl handler of a driver. | |
1313 | * This function: | |
1314 | * 1) verifies the passed buffer, | |
1315 | * 2) calls buf_finish callback in the driver (if provided), in which | |
1316 | * driver can perform any additional operations that may be required before | |
1317 | * returning the buffer to userspace, such as cache sync, | |
1318 | * 3) the buffer struct members are filled with relevant information for | |
1319 | * the userspace. | |
1320 | * | |
1321 | * The return values from this function are intended to be directly returned | |
1322 | * from vidioc_dqbuf handler in driver. | |
1323 | */ | |
1324 | int vb2_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking) | |
1325 | { | |
1326 | struct vb2_buffer *vb = NULL; | |
1327 | int ret; | |
1328 | ||
b25748fe MS |
1329 | if (q->fileio) { |
1330 | dprintk(1, "dqbuf: file io in progress\n"); | |
1331 | return -EBUSY; | |
1332 | } | |
1333 | ||
e23ccc0a PO |
1334 | if (b->type != q->type) { |
1335 | dprintk(1, "dqbuf: invalid buffer type\n"); | |
1336 | return -EINVAL; | |
1337 | } | |
1338 | ||
1339 | ret = __vb2_get_done_vb(q, &vb, nonblocking); | |
1340 | if (ret < 0) { | |
1341 | dprintk(1, "dqbuf: error getting next done buffer\n"); | |
1342 | return ret; | |
1343 | } | |
1344 | ||
1345 | ret = call_qop(q, buf_finish, vb); | |
1346 | if (ret) { | |
1347 | dprintk(1, "dqbuf: buffer finish failed\n"); | |
1348 | return ret; | |
1349 | } | |
1350 | ||
1351 | switch (vb->state) { | |
1352 | case VB2_BUF_STATE_DONE: | |
1353 | dprintk(3, "dqbuf: Returning done buffer\n"); | |
1354 | break; | |
1355 | case VB2_BUF_STATE_ERROR: | |
1356 | dprintk(3, "dqbuf: Returning done buffer with errors\n"); | |
1357 | break; | |
1358 | default: | |
1359 | dprintk(1, "dqbuf: Invalid buffer state\n"); | |
1360 | return -EINVAL; | |
1361 | } | |
1362 | ||
1363 | /* Fill buffer information for the userspace */ | |
1364 | __fill_v4l2_buffer(vb, b); | |
1365 | /* Remove from videobuf queue */ | |
1366 | list_del(&vb->queued_entry); | |
1367 | ||
1368 | dprintk(1, "dqbuf of buffer %d, with state %d\n", | |
1369 | vb->v4l2_buf.index, vb->state); | |
1370 | ||
1371 | vb->state = VB2_BUF_STATE_DEQUEUED; | |
1372 | return 0; | |
1373 | } | |
1374 | EXPORT_SYMBOL_GPL(vb2_dqbuf); | |
1375 | ||
bd323e28 MS |
1376 | /** |
1377 | * __vb2_queue_cancel() - cancel and stop (pause) streaming | |
1378 | * | |
1379 | * Removes all queued buffers from driver's queue and all buffers queued by | |
1380 | * userspace from videobuf's queue. Returns to state after reqbufs. | |
1381 | */ | |
1382 | static void __vb2_queue_cancel(struct vb2_queue *q) | |
1383 | { | |
1384 | unsigned int i; | |
1385 | ||
1386 | /* | |
1387 | * Tell driver to stop all transactions and release all queued | |
1388 | * buffers. | |
1389 | */ | |
1390 | if (q->streaming) | |
1391 | call_qop(q, stop_streaming, q); | |
1392 | q->streaming = 0; | |
1393 | ||
1394 | /* | |
1395 | * Remove all buffers from videobuf's list... | |
1396 | */ | |
1397 | INIT_LIST_HEAD(&q->queued_list); | |
1398 | /* | |
1399 | * ...and done list; userspace will not receive any buffers it | |
1400 | * has not already dequeued before initiating cancel. | |
1401 | */ | |
1402 | INIT_LIST_HEAD(&q->done_list); | |
1403 | atomic_set(&q->queued_count, 0); | |
1404 | wake_up_all(&q->done_wq); | |
1405 | ||
1406 | /* | |
1407 | * Reinitialize all buffers for next use. | |
1408 | */ | |
1409 | for (i = 0; i < q->num_buffers; ++i) | |
1410 | q->bufs[i]->state = VB2_BUF_STATE_DEQUEUED; | |
1411 | } | |
1412 | ||
e23ccc0a PO |
1413 | /** |
1414 | * vb2_streamon - start streaming | |
1415 | * @q: videobuf2 queue | |
1416 | * @type: type argument passed from userspace to vidioc_streamon handler | |
1417 | * | |
1418 | * Should be called from vidioc_streamon handler of a driver. | |
1419 | * This function: | |
1420 | * 1) verifies current state | |
bd323e28 | 1421 | * 2) passes any previously queued buffers to the driver and starts streaming |
e23ccc0a PO |
1422 | * |
1423 | * The return values from this function are intended to be directly returned | |
1424 | * from vidioc_streamon handler in the driver. | |
1425 | */ | |
1426 | int vb2_streamon(struct vb2_queue *q, enum v4l2_buf_type type) | |
1427 | { | |
1428 | struct vb2_buffer *vb; | |
5db2c3ba | 1429 | int ret; |
e23ccc0a | 1430 | |
b25748fe MS |
1431 | if (q->fileio) { |
1432 | dprintk(1, "streamon: file io in progress\n"); | |
1433 | return -EBUSY; | |
1434 | } | |
1435 | ||
e23ccc0a PO |
1436 | if (type != q->type) { |
1437 | dprintk(1, "streamon: invalid stream type\n"); | |
1438 | return -EINVAL; | |
1439 | } | |
1440 | ||
1441 | if (q->streaming) { | |
1442 | dprintk(1, "streamon: already streaming\n"); | |
1443 | return -EBUSY; | |
1444 | } | |
1445 | ||
1446 | /* | |
bd323e28 MS |
1447 | * If any buffers were queued before streamon, |
1448 | * we can now pass them to driver for processing. | |
e23ccc0a | 1449 | */ |
bd323e28 MS |
1450 | list_for_each_entry(vb, &q->queued_list, queued_entry) |
1451 | __enqueue_in_driver(vb); | |
e23ccc0a | 1452 | |
e23ccc0a PO |
1453 | /* |
1454 | * Let driver notice that streaming state has been enabled. | |
1455 | */ | |
bd323e28 | 1456 | ret = call_qop(q, start_streaming, q, atomic_read(&q->queued_count)); |
5db2c3ba PO |
1457 | if (ret) { |
1458 | dprintk(1, "streamon: driver refused to start streaming\n"); | |
bd323e28 | 1459 | __vb2_queue_cancel(q); |
5db2c3ba PO |
1460 | return ret; |
1461 | } | |
1462 | ||
1463 | q->streaming = 1; | |
e23ccc0a | 1464 | |
e23ccc0a PO |
1465 | dprintk(3, "Streamon successful\n"); |
1466 | return 0; | |
1467 | } | |
1468 | EXPORT_SYMBOL_GPL(vb2_streamon); | |
1469 | ||
e23ccc0a PO |
1470 | |
1471 | /** | |
1472 | * vb2_streamoff - stop streaming | |
1473 | * @q: videobuf2 queue | |
1474 | * @type: type argument passed from userspace to vidioc_streamoff handler | |
1475 | * | |
1476 | * Should be called from vidioc_streamoff handler of a driver. | |
1477 | * This function: | |
1478 | * 1) verifies current state, | |
1479 | * 2) stop streaming and dequeues any queued buffers, including those previously | |
1480 | * passed to the driver (after waiting for the driver to finish). | |
1481 | * | |
1482 | * This call can be used for pausing playback. | |
1483 | * The return values from this function are intended to be directly returned | |
1484 | * from vidioc_streamoff handler in the driver | |
1485 | */ | |
1486 | int vb2_streamoff(struct vb2_queue *q, enum v4l2_buf_type type) | |
1487 | { | |
b25748fe MS |
1488 | if (q->fileio) { |
1489 | dprintk(1, "streamoff: file io in progress\n"); | |
1490 | return -EBUSY; | |
1491 | } | |
1492 | ||
e23ccc0a PO |
1493 | if (type != q->type) { |
1494 | dprintk(1, "streamoff: invalid stream type\n"); | |
1495 | return -EINVAL; | |
1496 | } | |
1497 | ||
1498 | if (!q->streaming) { | |
1499 | dprintk(1, "streamoff: not streaming\n"); | |
1500 | return -EINVAL; | |
1501 | } | |
1502 | ||
1503 | /* | |
1504 | * Cancel will pause streaming and remove all buffers from the driver | |
1505 | * and videobuf, effectively returning control over them to userspace. | |
1506 | */ | |
1507 | __vb2_queue_cancel(q); | |
1508 | ||
1509 | dprintk(3, "Streamoff successful\n"); | |
1510 | return 0; | |
1511 | } | |
1512 | EXPORT_SYMBOL_GPL(vb2_streamoff); | |
1513 | ||
1514 | /** | |
1515 | * __find_plane_by_offset() - find plane associated with the given offset off | |
1516 | */ | |
1517 | static int __find_plane_by_offset(struct vb2_queue *q, unsigned long off, | |
1518 | unsigned int *_buffer, unsigned int *_plane) | |
1519 | { | |
1520 | struct vb2_buffer *vb; | |
1521 | unsigned int buffer, plane; | |
1522 | ||
1523 | /* | |
1524 | * Go over all buffers and their planes, comparing the given offset | |
1525 | * with an offset assigned to each plane. If a match is found, | |
1526 | * return its buffer and plane numbers. | |
1527 | */ | |
1528 | for (buffer = 0; buffer < q->num_buffers; ++buffer) { | |
1529 | vb = q->bufs[buffer]; | |
1530 | ||
1531 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
1532 | if (vb->v4l2_planes[plane].m.mem_offset == off) { | |
1533 | *_buffer = buffer; | |
1534 | *_plane = plane; | |
1535 | return 0; | |
1536 | } | |
1537 | } | |
1538 | } | |
1539 | ||
1540 | return -EINVAL; | |
1541 | } | |
1542 | ||
1543 | /** | |
1544 | * vb2_mmap() - map video buffers into application address space | |
1545 | * @q: videobuf2 queue | |
1546 | * @vma: vma passed to the mmap file operation handler in the driver | |
1547 | * | |
1548 | * Should be called from mmap file operation handler of a driver. | |
1549 | * This function maps one plane of one of the available video buffers to | |
1550 | * userspace. To map whole video memory allocated on reqbufs, this function | |
1551 | * has to be called once per each plane per each buffer previously allocated. | |
1552 | * | |
1553 | * When the userspace application calls mmap, it passes to it an offset returned | |
1554 | * to it earlier by the means of vidioc_querybuf handler. That offset acts as | |
1555 | * a "cookie", which is then used to identify the plane to be mapped. | |
1556 | * This function finds a plane with a matching offset and a mapping is performed | |
1557 | * by the means of a provided memory operation. | |
1558 | * | |
1559 | * The return values from this function are intended to be directly returned | |
1560 | * from the mmap handler in driver. | |
1561 | */ | |
1562 | int vb2_mmap(struct vb2_queue *q, struct vm_area_struct *vma) | |
1563 | { | |
1564 | unsigned long off = vma->vm_pgoff << PAGE_SHIFT; | |
e23ccc0a PO |
1565 | struct vb2_buffer *vb; |
1566 | unsigned int buffer, plane; | |
1567 | int ret; | |
1568 | ||
1569 | if (q->memory != V4L2_MEMORY_MMAP) { | |
1570 | dprintk(1, "Queue is not currently set up for mmap\n"); | |
1571 | return -EINVAL; | |
1572 | } | |
1573 | ||
1574 | /* | |
1575 | * Check memory area access mode. | |
1576 | */ | |
1577 | if (!(vma->vm_flags & VM_SHARED)) { | |
1578 | dprintk(1, "Invalid vma flags, VM_SHARED needed\n"); | |
1579 | return -EINVAL; | |
1580 | } | |
1581 | if (V4L2_TYPE_IS_OUTPUT(q->type)) { | |
1582 | if (!(vma->vm_flags & VM_WRITE)) { | |
1583 | dprintk(1, "Invalid vma flags, VM_WRITE needed\n"); | |
1584 | return -EINVAL; | |
1585 | } | |
1586 | } else { | |
1587 | if (!(vma->vm_flags & VM_READ)) { | |
1588 | dprintk(1, "Invalid vma flags, VM_READ needed\n"); | |
1589 | return -EINVAL; | |
1590 | } | |
1591 | } | |
1592 | ||
1593 | /* | |
1594 | * Find the plane corresponding to the offset passed by userspace. | |
1595 | */ | |
1596 | ret = __find_plane_by_offset(q, off, &buffer, &plane); | |
1597 | if (ret) | |
1598 | return ret; | |
1599 | ||
1600 | vb = q->bufs[buffer]; | |
e23ccc0a | 1601 | |
a00d0266 | 1602 | ret = call_memop(q, mmap, vb->planes[plane].mem_priv, vma); |
e23ccc0a PO |
1603 | if (ret) |
1604 | return ret; | |
1605 | ||
e23ccc0a PO |
1606 | dprintk(3, "Buffer %d, plane %d successfully mapped\n", buffer, plane); |
1607 | return 0; | |
1608 | } | |
1609 | EXPORT_SYMBOL_GPL(vb2_mmap); | |
1610 | ||
6f524ec1 SJ |
1611 | #ifndef CONFIG_MMU |
1612 | unsigned long vb2_get_unmapped_area(struct vb2_queue *q, | |
1613 | unsigned long addr, | |
1614 | unsigned long len, | |
1615 | unsigned long pgoff, | |
1616 | unsigned long flags) | |
1617 | { | |
1618 | unsigned long off = pgoff << PAGE_SHIFT; | |
1619 | struct vb2_buffer *vb; | |
1620 | unsigned int buffer, plane; | |
1621 | int ret; | |
1622 | ||
1623 | if (q->memory != V4L2_MEMORY_MMAP) { | |
1624 | dprintk(1, "Queue is not currently set up for mmap\n"); | |
1625 | return -EINVAL; | |
1626 | } | |
1627 | ||
1628 | /* | |
1629 | * Find the plane corresponding to the offset passed by userspace. | |
1630 | */ | |
1631 | ret = __find_plane_by_offset(q, off, &buffer, &plane); | |
1632 | if (ret) | |
1633 | return ret; | |
1634 | ||
1635 | vb = q->bufs[buffer]; | |
1636 | ||
1637 | return (unsigned long)vb2_plane_vaddr(vb, plane); | |
1638 | } | |
1639 | EXPORT_SYMBOL_GPL(vb2_get_unmapped_area); | |
1640 | #endif | |
1641 | ||
b25748fe MS |
1642 | static int __vb2_init_fileio(struct vb2_queue *q, int read); |
1643 | static int __vb2_cleanup_fileio(struct vb2_queue *q); | |
e23ccc0a PO |
1644 | |
1645 | /** | |
1646 | * vb2_poll() - implements poll userspace operation | |
1647 | * @q: videobuf2 queue | |
1648 | * @file: file argument passed to the poll file operation handler | |
1649 | * @wait: wait argument passed to the poll file operation handler | |
1650 | * | |
1651 | * This function implements poll file operation handler for a driver. | |
1652 | * For CAPTURE queues, if a buffer is ready to be dequeued, the userspace will | |
1653 | * be informed that the file descriptor of a video device is available for | |
1654 | * reading. | |
1655 | * For OUTPUT queues, if a buffer is ready to be dequeued, the file descriptor | |
1656 | * will be reported as available for writing. | |
1657 | * | |
95213ceb HV |
1658 | * If the driver uses struct v4l2_fh, then vb2_poll() will also check for any |
1659 | * pending events. | |
1660 | * | |
e23ccc0a PO |
1661 | * The return values from this function are intended to be directly returned |
1662 | * from poll handler in driver. | |
1663 | */ | |
1664 | unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait) | |
1665 | { | |
95213ceb | 1666 | struct video_device *vfd = video_devdata(file); |
bf5c7cbb | 1667 | unsigned long req_events = poll_requested_events(wait); |
e23ccc0a | 1668 | struct vb2_buffer *vb = NULL; |
95213ceb HV |
1669 | unsigned int res = 0; |
1670 | unsigned long flags; | |
1671 | ||
1672 | if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) { | |
1673 | struct v4l2_fh *fh = file->private_data; | |
1674 | ||
1675 | if (v4l2_event_pending(fh)) | |
1676 | res = POLLPRI; | |
1677 | else if (req_events & POLLPRI) | |
1678 | poll_wait(file, &fh->wait, wait); | |
1679 | } | |
e23ccc0a | 1680 | |
b25748fe | 1681 | /* |
4ffabdb3 | 1682 | * Start file I/O emulator only if streaming API has not been used yet. |
b25748fe MS |
1683 | */ |
1684 | if (q->num_buffers == 0 && q->fileio == NULL) { | |
bf5c7cbb HV |
1685 | if (!V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_READ) && |
1686 | (req_events & (POLLIN | POLLRDNORM))) { | |
95213ceb HV |
1687 | if (__vb2_init_fileio(q, 1)) |
1688 | return res | POLLERR; | |
b25748fe | 1689 | } |
bf5c7cbb HV |
1690 | if (V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_WRITE) && |
1691 | (req_events & (POLLOUT | POLLWRNORM))) { | |
95213ceb HV |
1692 | if (__vb2_init_fileio(q, 0)) |
1693 | return res | POLLERR; | |
b25748fe MS |
1694 | /* |
1695 | * Write to OUTPUT queue can be done immediately. | |
1696 | */ | |
95213ceb | 1697 | return res | POLLOUT | POLLWRNORM; |
b25748fe MS |
1698 | } |
1699 | } | |
1700 | ||
e23ccc0a PO |
1701 | /* |
1702 | * There is nothing to wait for if no buffers have already been queued. | |
1703 | */ | |
1704 | if (list_empty(&q->queued_list)) | |
95213ceb | 1705 | return res | POLLERR; |
e23ccc0a PO |
1706 | |
1707 | poll_wait(file, &q->done_wq, wait); | |
1708 | ||
1709 | /* | |
1710 | * Take first buffer available for dequeuing. | |
1711 | */ | |
1712 | spin_lock_irqsave(&q->done_lock, flags); | |
1713 | if (!list_empty(&q->done_list)) | |
1714 | vb = list_first_entry(&q->done_list, struct vb2_buffer, | |
1715 | done_entry); | |
1716 | spin_unlock_irqrestore(&q->done_lock, flags); | |
1717 | ||
1718 | if (vb && (vb->state == VB2_BUF_STATE_DONE | |
1719 | || vb->state == VB2_BUF_STATE_ERROR)) { | |
95213ceb HV |
1720 | return (V4L2_TYPE_IS_OUTPUT(q->type)) ? |
1721 | res | POLLOUT | POLLWRNORM : | |
1722 | res | POLLIN | POLLRDNORM; | |
e23ccc0a | 1723 | } |
95213ceb | 1724 | return res; |
e23ccc0a PO |
1725 | } |
1726 | EXPORT_SYMBOL_GPL(vb2_poll); | |
1727 | ||
1728 | /** | |
1729 | * vb2_queue_init() - initialize a videobuf2 queue | |
1730 | * @q: videobuf2 queue; this structure should be allocated in driver | |
1731 | * | |
1732 | * The vb2_queue structure should be allocated by the driver. The driver is | |
1733 | * responsible of clearing it's content and setting initial values for some | |
1734 | * required entries before calling this function. | |
1735 | * q->ops, q->mem_ops, q->type and q->io_modes are mandatory. Please refer | |
1736 | * to the struct vb2_queue description in include/media/videobuf2-core.h | |
1737 | * for more information. | |
1738 | */ | |
1739 | int vb2_queue_init(struct vb2_queue *q) | |
1740 | { | |
1741 | BUG_ON(!q); | |
1742 | BUG_ON(!q->ops); | |
1743 | BUG_ON(!q->mem_ops); | |
1744 | BUG_ON(!q->type); | |
1745 | BUG_ON(!q->io_modes); | |
1746 | ||
1747 | BUG_ON(!q->ops->queue_setup); | |
1748 | BUG_ON(!q->ops->buf_queue); | |
1749 | ||
1750 | INIT_LIST_HEAD(&q->queued_list); | |
1751 | INIT_LIST_HEAD(&q->done_list); | |
1752 | spin_lock_init(&q->done_lock); | |
1753 | init_waitqueue_head(&q->done_wq); | |
1754 | ||
1755 | if (q->buf_struct_size == 0) | |
1756 | q->buf_struct_size = sizeof(struct vb2_buffer); | |
1757 | ||
1758 | return 0; | |
1759 | } | |
1760 | EXPORT_SYMBOL_GPL(vb2_queue_init); | |
1761 | ||
1762 | /** | |
1763 | * vb2_queue_release() - stop streaming, release the queue and free memory | |
1764 | * @q: videobuf2 queue | |
1765 | * | |
1766 | * This function stops streaming and performs necessary clean ups, including | |
1767 | * freeing video buffer memory. The driver is responsible for freeing | |
1768 | * the vb2_queue structure itself. | |
1769 | */ | |
1770 | void vb2_queue_release(struct vb2_queue *q) | |
1771 | { | |
b25748fe | 1772 | __vb2_cleanup_fileio(q); |
e23ccc0a | 1773 | __vb2_queue_cancel(q); |
2d86401c | 1774 | __vb2_queue_free(q, q->num_buffers); |
e23ccc0a PO |
1775 | } |
1776 | EXPORT_SYMBOL_GPL(vb2_queue_release); | |
1777 | ||
b25748fe MS |
1778 | /** |
1779 | * struct vb2_fileio_buf - buffer context used by file io emulator | |
1780 | * | |
1781 | * vb2 provides a compatibility layer and emulator of file io (read and | |
1782 | * write) calls on top of streaming API. This structure is used for | |
1783 | * tracking context related to the buffers. | |
1784 | */ | |
1785 | struct vb2_fileio_buf { | |
1786 | void *vaddr; | |
1787 | unsigned int size; | |
1788 | unsigned int pos; | |
1789 | unsigned int queued:1; | |
1790 | }; | |
1791 | ||
1792 | /** | |
1793 | * struct vb2_fileio_data - queue context used by file io emulator | |
1794 | * | |
1795 | * vb2 provides a compatibility layer and emulator of file io (read and | |
1796 | * write) calls on top of streaming API. For proper operation it required | |
1797 | * this structure to save the driver state between each call of the read | |
1798 | * or write function. | |
1799 | */ | |
1800 | struct vb2_fileio_data { | |
1801 | struct v4l2_requestbuffers req; | |
1802 | struct v4l2_buffer b; | |
1803 | struct vb2_fileio_buf bufs[VIDEO_MAX_FRAME]; | |
1804 | unsigned int index; | |
1805 | unsigned int q_count; | |
1806 | unsigned int dq_count; | |
1807 | unsigned int flags; | |
1808 | }; | |
1809 | ||
1810 | /** | |
1811 | * __vb2_init_fileio() - initialize file io emulator | |
1812 | * @q: videobuf2 queue | |
1813 | * @read: mode selector (1 means read, 0 means write) | |
1814 | */ | |
1815 | static int __vb2_init_fileio(struct vb2_queue *q, int read) | |
1816 | { | |
1817 | struct vb2_fileio_data *fileio; | |
1818 | int i, ret; | |
1819 | unsigned int count = 0; | |
1820 | ||
1821 | /* | |
1822 | * Sanity check | |
1823 | */ | |
1824 | if ((read && !(q->io_modes & VB2_READ)) || | |
1825 | (!read && !(q->io_modes & VB2_WRITE))) | |
1826 | BUG(); | |
1827 | ||
1828 | /* | |
1829 | * Check if device supports mapping buffers to kernel virtual space. | |
1830 | */ | |
1831 | if (!q->mem_ops->vaddr) | |
1832 | return -EBUSY; | |
1833 | ||
1834 | /* | |
1835 | * Check if streaming api has not been already activated. | |
1836 | */ | |
1837 | if (q->streaming || q->num_buffers > 0) | |
1838 | return -EBUSY; | |
1839 | ||
1840 | /* | |
1841 | * Start with count 1, driver can increase it in queue_setup() | |
1842 | */ | |
1843 | count = 1; | |
1844 | ||
1845 | dprintk(3, "setting up file io: mode %s, count %d, flags %08x\n", | |
1846 | (read) ? "read" : "write", count, q->io_flags); | |
1847 | ||
1848 | fileio = kzalloc(sizeof(struct vb2_fileio_data), GFP_KERNEL); | |
1849 | if (fileio == NULL) | |
1850 | return -ENOMEM; | |
1851 | ||
1852 | fileio->flags = q->io_flags; | |
1853 | ||
1854 | /* | |
1855 | * Request buffers and use MMAP type to force driver | |
1856 | * to allocate buffers by itself. | |
1857 | */ | |
1858 | fileio->req.count = count; | |
1859 | fileio->req.memory = V4L2_MEMORY_MMAP; | |
1860 | fileio->req.type = q->type; | |
1861 | ret = vb2_reqbufs(q, &fileio->req); | |
1862 | if (ret) | |
1863 | goto err_kfree; | |
1864 | ||
1865 | /* | |
1866 | * Check if plane_count is correct | |
1867 | * (multiplane buffers are not supported). | |
1868 | */ | |
1869 | if (q->bufs[0]->num_planes != 1) { | |
b25748fe MS |
1870 | ret = -EBUSY; |
1871 | goto err_reqbufs; | |
1872 | } | |
1873 | ||
1874 | /* | |
1875 | * Get kernel address of each buffer. | |
1876 | */ | |
1877 | for (i = 0; i < q->num_buffers; i++) { | |
1878 | fileio->bufs[i].vaddr = vb2_plane_vaddr(q->bufs[i], 0); | |
1879 | if (fileio->bufs[i].vaddr == NULL) | |
1880 | goto err_reqbufs; | |
1881 | fileio->bufs[i].size = vb2_plane_size(q->bufs[i], 0); | |
1882 | } | |
1883 | ||
1884 | /* | |
1885 | * Read mode requires pre queuing of all buffers. | |
1886 | */ | |
1887 | if (read) { | |
1888 | /* | |
1889 | * Queue all buffers. | |
1890 | */ | |
1891 | for (i = 0; i < q->num_buffers; i++) { | |
1892 | struct v4l2_buffer *b = &fileio->b; | |
1893 | memset(b, 0, sizeof(*b)); | |
1894 | b->type = q->type; | |
1895 | b->memory = q->memory; | |
1896 | b->index = i; | |
1897 | ret = vb2_qbuf(q, b); | |
1898 | if (ret) | |
1899 | goto err_reqbufs; | |
1900 | fileio->bufs[i].queued = 1; | |
1901 | } | |
1902 | ||
1903 | /* | |
1904 | * Start streaming. | |
1905 | */ | |
1906 | ret = vb2_streamon(q, q->type); | |
1907 | if (ret) | |
1908 | goto err_reqbufs; | |
1909 | } | |
1910 | ||
1911 | q->fileio = fileio; | |
1912 | ||
1913 | return ret; | |
1914 | ||
1915 | err_reqbufs: | |
a67e1722 | 1916 | fileio->req.count = 0; |
b25748fe MS |
1917 | vb2_reqbufs(q, &fileio->req); |
1918 | ||
1919 | err_kfree: | |
1920 | kfree(fileio); | |
1921 | return ret; | |
1922 | } | |
1923 | ||
1924 | /** | |
1925 | * __vb2_cleanup_fileio() - free resourced used by file io emulator | |
1926 | * @q: videobuf2 queue | |
1927 | */ | |
1928 | static int __vb2_cleanup_fileio(struct vb2_queue *q) | |
1929 | { | |
1930 | struct vb2_fileio_data *fileio = q->fileio; | |
1931 | ||
1932 | if (fileio) { | |
1933 | /* | |
1934 | * Hack fileio context to enable direct calls to vb2 ioctl | |
1935 | * interface. | |
1936 | */ | |
1937 | q->fileio = NULL; | |
1938 | ||
1939 | vb2_streamoff(q, q->type); | |
1940 | fileio->req.count = 0; | |
1941 | vb2_reqbufs(q, &fileio->req); | |
1942 | kfree(fileio); | |
1943 | dprintk(3, "file io emulator closed\n"); | |
1944 | } | |
1945 | return 0; | |
1946 | } | |
1947 | ||
1948 | /** | |
1949 | * __vb2_perform_fileio() - perform a single file io (read or write) operation | |
1950 | * @q: videobuf2 queue | |
1951 | * @data: pointed to target userspace buffer | |
1952 | * @count: number of bytes to read or write | |
1953 | * @ppos: file handle position tracking pointer | |
1954 | * @nonblock: mode selector (1 means blocking calls, 0 means nonblocking) | |
1955 | * @read: access mode selector (1 means read, 0 means write) | |
1956 | */ | |
1957 | static size_t __vb2_perform_fileio(struct vb2_queue *q, char __user *data, size_t count, | |
1958 | loff_t *ppos, int nonblock, int read) | |
1959 | { | |
1960 | struct vb2_fileio_data *fileio; | |
1961 | struct vb2_fileio_buf *buf; | |
1962 | int ret, index; | |
1963 | ||
08b99e26 | 1964 | dprintk(3, "file io: mode %s, offset %ld, count %zd, %sblocking\n", |
b25748fe MS |
1965 | read ? "read" : "write", (long)*ppos, count, |
1966 | nonblock ? "non" : ""); | |
1967 | ||
1968 | if (!data) | |
1969 | return -EINVAL; | |
1970 | ||
1971 | /* | |
1972 | * Initialize emulator on first call. | |
1973 | */ | |
1974 | if (!q->fileio) { | |
1975 | ret = __vb2_init_fileio(q, read); | |
1976 | dprintk(3, "file io: vb2_init_fileio result: %d\n", ret); | |
1977 | if (ret) | |
1978 | return ret; | |
1979 | } | |
1980 | fileio = q->fileio; | |
1981 | ||
1982 | /* | |
1983 | * Hack fileio context to enable direct calls to vb2 ioctl interface. | |
1984 | * The pointer will be restored before returning from this function. | |
1985 | */ | |
1986 | q->fileio = NULL; | |
1987 | ||
1988 | index = fileio->index; | |
1989 | buf = &fileio->bufs[index]; | |
1990 | ||
1991 | /* | |
1992 | * Check if we need to dequeue the buffer. | |
1993 | */ | |
1994 | if (buf->queued) { | |
1995 | struct vb2_buffer *vb; | |
1996 | ||
1997 | /* | |
1998 | * Call vb2_dqbuf to get buffer back. | |
1999 | */ | |
2000 | memset(&fileio->b, 0, sizeof(fileio->b)); | |
2001 | fileio->b.type = q->type; | |
2002 | fileio->b.memory = q->memory; | |
2003 | fileio->b.index = index; | |
2004 | ret = vb2_dqbuf(q, &fileio->b, nonblock); | |
2005 | dprintk(5, "file io: vb2_dqbuf result: %d\n", ret); | |
2006 | if (ret) | |
2007 | goto end; | |
2008 | fileio->dq_count += 1; | |
2009 | ||
2010 | /* | |
2011 | * Get number of bytes filled by the driver | |
2012 | */ | |
2013 | vb = q->bufs[index]; | |
2014 | buf->size = vb2_get_plane_payload(vb, 0); | |
2015 | buf->queued = 0; | |
2016 | } | |
2017 | ||
2018 | /* | |
2019 | * Limit count on last few bytes of the buffer. | |
2020 | */ | |
2021 | if (buf->pos + count > buf->size) { | |
2022 | count = buf->size - buf->pos; | |
08b99e26 | 2023 | dprintk(5, "reducing read count: %zd\n", count); |
b25748fe MS |
2024 | } |
2025 | ||
2026 | /* | |
2027 | * Transfer data to userspace. | |
2028 | */ | |
08b99e26 | 2029 | dprintk(3, "file io: copying %zd bytes - buffer %d, offset %u\n", |
b25748fe MS |
2030 | count, index, buf->pos); |
2031 | if (read) | |
2032 | ret = copy_to_user(data, buf->vaddr + buf->pos, count); | |
2033 | else | |
2034 | ret = copy_from_user(buf->vaddr + buf->pos, data, count); | |
2035 | if (ret) { | |
2036 | dprintk(3, "file io: error copying data\n"); | |
2037 | ret = -EFAULT; | |
2038 | goto end; | |
2039 | } | |
2040 | ||
2041 | /* | |
2042 | * Update counters. | |
2043 | */ | |
2044 | buf->pos += count; | |
2045 | *ppos += count; | |
2046 | ||
2047 | /* | |
2048 | * Queue next buffer if required. | |
2049 | */ | |
2050 | if (buf->pos == buf->size || | |
2051 | (!read && (fileio->flags & VB2_FILEIO_WRITE_IMMEDIATELY))) { | |
2052 | /* | |
2053 | * Check if this is the last buffer to read. | |
2054 | */ | |
2055 | if (read && (fileio->flags & VB2_FILEIO_READ_ONCE) && | |
2056 | fileio->dq_count == 1) { | |
2057 | dprintk(3, "file io: read limit reached\n"); | |
2058 | /* | |
2059 | * Restore fileio pointer and release the context. | |
2060 | */ | |
2061 | q->fileio = fileio; | |
2062 | return __vb2_cleanup_fileio(q); | |
2063 | } | |
2064 | ||
2065 | /* | |
2066 | * Call vb2_qbuf and give buffer to the driver. | |
2067 | */ | |
2068 | memset(&fileio->b, 0, sizeof(fileio->b)); | |
2069 | fileio->b.type = q->type; | |
2070 | fileio->b.memory = q->memory; | |
2071 | fileio->b.index = index; | |
2072 | fileio->b.bytesused = buf->pos; | |
2073 | ret = vb2_qbuf(q, &fileio->b); | |
2074 | dprintk(5, "file io: vb2_dbuf result: %d\n", ret); | |
2075 | if (ret) | |
2076 | goto end; | |
2077 | ||
2078 | /* | |
2079 | * Buffer has been queued, update the status | |
2080 | */ | |
2081 | buf->pos = 0; | |
2082 | buf->queued = 1; | |
2083 | buf->size = q->bufs[0]->v4l2_planes[0].length; | |
2084 | fileio->q_count += 1; | |
2085 | ||
2086 | /* | |
2087 | * Switch to the next buffer | |
2088 | */ | |
2089 | fileio->index = (index + 1) % q->num_buffers; | |
2090 | ||
2091 | /* | |
2092 | * Start streaming if required. | |
2093 | */ | |
2094 | if (!read && !q->streaming) { | |
2095 | ret = vb2_streamon(q, q->type); | |
2096 | if (ret) | |
2097 | goto end; | |
2098 | } | |
2099 | } | |
2100 | ||
2101 | /* | |
2102 | * Return proper number of bytes processed. | |
2103 | */ | |
2104 | if (ret == 0) | |
2105 | ret = count; | |
2106 | end: | |
2107 | /* | |
2108 | * Restore the fileio context and block vb2 ioctl interface. | |
2109 | */ | |
2110 | q->fileio = fileio; | |
2111 | return ret; | |
2112 | } | |
2113 | ||
2114 | size_t vb2_read(struct vb2_queue *q, char __user *data, size_t count, | |
2115 | loff_t *ppos, int nonblocking) | |
2116 | { | |
2117 | return __vb2_perform_fileio(q, data, count, ppos, nonblocking, 1); | |
2118 | } | |
2119 | EXPORT_SYMBOL_GPL(vb2_read); | |
2120 | ||
2121 | size_t vb2_write(struct vb2_queue *q, char __user *data, size_t count, | |
2122 | loff_t *ppos, int nonblocking) | |
2123 | { | |
2124 | return __vb2_perform_fileio(q, data, count, ppos, nonblocking, 0); | |
2125 | } | |
2126 | EXPORT_SYMBOL_GPL(vb2_write); | |
2127 | ||
4c1ffcaa HV |
2128 | |
2129 | /* | |
2130 | * The following functions are not part of the vb2 core API, but are helper | |
2131 | * functions that plug into struct v4l2_ioctl_ops, struct v4l2_file_operations | |
2132 | * and struct vb2_ops. | |
2133 | * They contain boilerplate code that most if not all drivers have to do | |
2134 | * and so they simplify the driver code. | |
2135 | */ | |
2136 | ||
2137 | /* The queue is busy if there is a owner and you are not that owner. */ | |
2138 | static inline bool vb2_queue_is_busy(struct video_device *vdev, struct file *file) | |
2139 | { | |
2140 | return vdev->queue->owner && vdev->queue->owner != file->private_data; | |
2141 | } | |
2142 | ||
2143 | /* vb2 ioctl helpers */ | |
2144 | ||
2145 | int vb2_ioctl_reqbufs(struct file *file, void *priv, | |
2146 | struct v4l2_requestbuffers *p) | |
2147 | { | |
2148 | struct video_device *vdev = video_devdata(file); | |
2149 | int res = __verify_memory_type(vdev->queue, p->memory, p->type); | |
2150 | ||
2151 | if (res) | |
2152 | return res; | |
2153 | if (vb2_queue_is_busy(vdev, file)) | |
2154 | return -EBUSY; | |
2155 | res = __reqbufs(vdev->queue, p); | |
2156 | /* If count == 0, then the owner has released all buffers and he | |
2157 | is no longer owner of the queue. Otherwise we have a new owner. */ | |
2158 | if (res == 0) | |
2159 | vdev->queue->owner = p->count ? file->private_data : NULL; | |
2160 | return res; | |
2161 | } | |
2162 | EXPORT_SYMBOL_GPL(vb2_ioctl_reqbufs); | |
2163 | ||
2164 | int vb2_ioctl_create_bufs(struct file *file, void *priv, | |
2165 | struct v4l2_create_buffers *p) | |
2166 | { | |
2167 | struct video_device *vdev = video_devdata(file); | |
2168 | int res = __verify_memory_type(vdev->queue, p->memory, p->format.type); | |
2169 | ||
2170 | p->index = vdev->queue->num_buffers; | |
2171 | /* If count == 0, then just check if memory and type are valid. | |
2172 | Any -EBUSY result from __verify_memory_type can be mapped to 0. */ | |
2173 | if (p->count == 0) | |
2174 | return res != -EBUSY ? res : 0; | |
2175 | if (res) | |
2176 | return res; | |
2177 | if (vb2_queue_is_busy(vdev, file)) | |
2178 | return -EBUSY; | |
2179 | res = __create_bufs(vdev->queue, p); | |
2180 | if (res == 0) | |
2181 | vdev->queue->owner = file->private_data; | |
2182 | return res; | |
2183 | } | |
2184 | EXPORT_SYMBOL_GPL(vb2_ioctl_create_bufs); | |
2185 | ||
2186 | int vb2_ioctl_prepare_buf(struct file *file, void *priv, | |
2187 | struct v4l2_buffer *p) | |
2188 | { | |
2189 | struct video_device *vdev = video_devdata(file); | |
2190 | ||
2191 | if (vb2_queue_is_busy(vdev, file)) | |
2192 | return -EBUSY; | |
2193 | return vb2_prepare_buf(vdev->queue, p); | |
2194 | } | |
2195 | EXPORT_SYMBOL_GPL(vb2_ioctl_prepare_buf); | |
2196 | ||
2197 | int vb2_ioctl_querybuf(struct file *file, void *priv, struct v4l2_buffer *p) | |
2198 | { | |
2199 | struct video_device *vdev = video_devdata(file); | |
2200 | ||
2201 | /* No need to call vb2_queue_is_busy(), anyone can query buffers. */ | |
2202 | return vb2_querybuf(vdev->queue, p); | |
2203 | } | |
2204 | EXPORT_SYMBOL_GPL(vb2_ioctl_querybuf); | |
2205 | ||
2206 | int vb2_ioctl_qbuf(struct file *file, void *priv, struct v4l2_buffer *p) | |
2207 | { | |
2208 | struct video_device *vdev = video_devdata(file); | |
2209 | ||
2210 | if (vb2_queue_is_busy(vdev, file)) | |
2211 | return -EBUSY; | |
2212 | return vb2_qbuf(vdev->queue, p); | |
2213 | } | |
2214 | EXPORT_SYMBOL_GPL(vb2_ioctl_qbuf); | |
2215 | ||
2216 | int vb2_ioctl_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p) | |
2217 | { | |
2218 | struct video_device *vdev = video_devdata(file); | |
2219 | ||
2220 | if (vb2_queue_is_busy(vdev, file)) | |
2221 | return -EBUSY; | |
2222 | return vb2_dqbuf(vdev->queue, p, file->f_flags & O_NONBLOCK); | |
2223 | } | |
2224 | EXPORT_SYMBOL_GPL(vb2_ioctl_dqbuf); | |
2225 | ||
2226 | int vb2_ioctl_streamon(struct file *file, void *priv, enum v4l2_buf_type i) | |
2227 | { | |
2228 | struct video_device *vdev = video_devdata(file); | |
2229 | ||
2230 | if (vb2_queue_is_busy(vdev, file)) | |
2231 | return -EBUSY; | |
2232 | return vb2_streamon(vdev->queue, i); | |
2233 | } | |
2234 | EXPORT_SYMBOL_GPL(vb2_ioctl_streamon); | |
2235 | ||
2236 | int vb2_ioctl_streamoff(struct file *file, void *priv, enum v4l2_buf_type i) | |
2237 | { | |
2238 | struct video_device *vdev = video_devdata(file); | |
2239 | ||
2240 | if (vb2_queue_is_busy(vdev, file)) | |
2241 | return -EBUSY; | |
2242 | return vb2_streamoff(vdev->queue, i); | |
2243 | } | |
2244 | EXPORT_SYMBOL_GPL(vb2_ioctl_streamoff); | |
2245 | ||
2246 | /* v4l2_file_operations helpers */ | |
2247 | ||
2248 | int vb2_fop_mmap(struct file *file, struct vm_area_struct *vma) | |
2249 | { | |
2250 | struct video_device *vdev = video_devdata(file); | |
2251 | ||
2252 | return vb2_mmap(vdev->queue, vma); | |
2253 | } | |
2254 | EXPORT_SYMBOL_GPL(vb2_fop_mmap); | |
2255 | ||
2256 | int vb2_fop_release(struct file *file) | |
2257 | { | |
2258 | struct video_device *vdev = video_devdata(file); | |
2259 | ||
2260 | if (file->private_data == vdev->queue->owner) { | |
2261 | vb2_queue_release(vdev->queue); | |
2262 | vdev->queue->owner = NULL; | |
2263 | } | |
2264 | return v4l2_fh_release(file); | |
2265 | } | |
2266 | EXPORT_SYMBOL_GPL(vb2_fop_release); | |
2267 | ||
2268 | ssize_t vb2_fop_write(struct file *file, char __user *buf, | |
2269 | size_t count, loff_t *ppos) | |
2270 | { | |
2271 | struct video_device *vdev = video_devdata(file); | |
2272 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; | |
4c1ffcaa HV |
2273 | int err = -EBUSY; |
2274 | ||
cf533735 | 2275 | if (lock && mutex_lock_interruptible(lock)) |
4c1ffcaa HV |
2276 | return -ERESTARTSYS; |
2277 | if (vb2_queue_is_busy(vdev, file)) | |
2278 | goto exit; | |
2279 | err = vb2_write(vdev->queue, buf, count, ppos, | |
2280 | file->f_flags & O_NONBLOCK); | |
2281 | if (err >= 0) | |
2282 | vdev->queue->owner = file->private_data; | |
2283 | exit: | |
cf533735 | 2284 | if (lock) |
4c1ffcaa HV |
2285 | mutex_unlock(lock); |
2286 | return err; | |
2287 | } | |
2288 | EXPORT_SYMBOL_GPL(vb2_fop_write); | |
2289 | ||
2290 | ssize_t vb2_fop_read(struct file *file, char __user *buf, | |
2291 | size_t count, loff_t *ppos) | |
2292 | { | |
2293 | struct video_device *vdev = video_devdata(file); | |
2294 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; | |
4c1ffcaa HV |
2295 | int err = -EBUSY; |
2296 | ||
cf533735 | 2297 | if (lock && mutex_lock_interruptible(lock)) |
4c1ffcaa HV |
2298 | return -ERESTARTSYS; |
2299 | if (vb2_queue_is_busy(vdev, file)) | |
2300 | goto exit; | |
2301 | err = vb2_read(vdev->queue, buf, count, ppos, | |
2302 | file->f_flags & O_NONBLOCK); | |
2303 | if (err >= 0) | |
2304 | vdev->queue->owner = file->private_data; | |
2305 | exit: | |
cf533735 | 2306 | if (lock) |
4c1ffcaa HV |
2307 | mutex_unlock(lock); |
2308 | return err; | |
2309 | } | |
2310 | EXPORT_SYMBOL_GPL(vb2_fop_read); | |
2311 | ||
2312 | unsigned int vb2_fop_poll(struct file *file, poll_table *wait) | |
2313 | { | |
2314 | struct video_device *vdev = video_devdata(file); | |
2315 | struct vb2_queue *q = vdev->queue; | |
2316 | struct mutex *lock = q->lock ? q->lock : vdev->lock; | |
2317 | unsigned long req_events = poll_requested_events(wait); | |
2318 | unsigned res; | |
2319 | void *fileio; | |
4c1ffcaa HV |
2320 | bool must_lock = false; |
2321 | ||
2322 | /* Try to be smart: only lock if polling might start fileio, | |
2323 | otherwise locking will only introduce unwanted delays. */ | |
2324 | if (q->num_buffers == 0 && q->fileio == NULL) { | |
2325 | if (!V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_READ) && | |
2326 | (req_events & (POLLIN | POLLRDNORM))) | |
2327 | must_lock = true; | |
2328 | else if (V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_WRITE) && | |
2329 | (req_events & (POLLOUT | POLLWRNORM))) | |
2330 | must_lock = true; | |
2331 | } | |
2332 | ||
2333 | /* If locking is needed, but this helper doesn't know how, then you | |
2334 | shouldn't be using this helper but you should write your own. */ | |
cf533735 | 2335 | WARN_ON(must_lock && !lock); |
4c1ffcaa | 2336 | |
cf533735 | 2337 | if (must_lock && lock && mutex_lock_interruptible(lock)) |
4c1ffcaa HV |
2338 | return POLLERR; |
2339 | ||
2340 | fileio = q->fileio; | |
2341 | ||
2342 | res = vb2_poll(vdev->queue, file, wait); | |
2343 | ||
2344 | /* If fileio was started, then we have a new queue owner. */ | |
2345 | if (must_lock && !fileio && q->fileio) | |
2346 | q->owner = file->private_data; | |
cf533735 | 2347 | if (must_lock && lock) |
4c1ffcaa HV |
2348 | mutex_unlock(lock); |
2349 | return res; | |
2350 | } | |
2351 | EXPORT_SYMBOL_GPL(vb2_fop_poll); | |
2352 | ||
2353 | #ifndef CONFIG_MMU | |
2354 | unsigned long vb2_fop_get_unmapped_area(struct file *file, unsigned long addr, | |
2355 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
2356 | { | |
2357 | struct video_device *vdev = video_devdata(file); | |
2358 | ||
2359 | return vb2_get_unmapped_area(vdev->queue, addr, len, pgoff, flags); | |
2360 | } | |
2361 | EXPORT_SYMBOL_GPL(vb2_fop_get_unmapped_area); | |
2362 | #endif | |
2363 | ||
2364 | /* vb2_ops helpers. Only use if vq->lock is non-NULL. */ | |
2365 | ||
2366 | void vb2_ops_wait_prepare(struct vb2_queue *vq) | |
2367 | { | |
2368 | mutex_unlock(vq->lock); | |
2369 | } | |
2370 | EXPORT_SYMBOL_GPL(vb2_ops_wait_prepare); | |
2371 | ||
2372 | void vb2_ops_wait_finish(struct vb2_queue *vq) | |
2373 | { | |
2374 | mutex_lock(vq->lock); | |
2375 | } | |
2376 | EXPORT_SYMBOL_GPL(vb2_ops_wait_finish); | |
2377 | ||
e23ccc0a | 2378 | MODULE_DESCRIPTION("Driver helper framework for Video for Linux 2"); |
95072084 | 2379 | MODULE_AUTHOR("Pawel Osciak <pawel@osciak.com>, Marek Szyprowski"); |
e23ccc0a | 2380 | MODULE_LICENSE("GPL"); |