Commit | Line | Data |
---|---|---|
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 | ||
1b18e7a0 | 43 | #define V4L2_BUFFER_MASK_FLAGS (V4L2_BUF_FLAG_MAPPED | V4L2_BUF_FLAG_QUEUED | \ |
2d86401c | 44 | V4L2_BUF_FLAG_DONE | V4L2_BUF_FLAG_ERROR | \ |
1b18e7a0 SA |
45 | V4L2_BUF_FLAG_PREPARED | \ |
46 | V4L2_BUF_FLAG_TIMESTAMP_MASK) | |
ea42c8ec | 47 | |
e23ccc0a PO |
48 | /** |
49 | * __vb2_buf_mem_alloc() - allocate video memory for the given buffer | |
50 | */ | |
c1426bc7 | 51 | static int __vb2_buf_mem_alloc(struct vb2_buffer *vb) |
e23ccc0a PO |
52 | { |
53 | struct vb2_queue *q = vb->vb2_queue; | |
54 | void *mem_priv; | |
55 | int plane; | |
56 | ||
7f841459 MCC |
57 | /* |
58 | * Allocate memory for all planes in this buffer | |
59 | * NOTE: mmapped areas should be page aligned | |
60 | */ | |
e23ccc0a | 61 | for (plane = 0; plane < vb->num_planes; ++plane) { |
7f841459 MCC |
62 | unsigned long size = PAGE_ALIGN(q->plane_sizes[plane]); |
63 | ||
5931ffe3 | 64 | mem_priv = call_memop(q, alloc, q->alloc_ctx[plane], |
7f841459 | 65 | size, q->gfp_flags); |
62a79436 | 66 | if (IS_ERR_OR_NULL(mem_priv)) |
e23ccc0a PO |
67 | goto free; |
68 | ||
69 | /* Associate allocator private data with this plane */ | |
70 | vb->planes[plane].mem_priv = mem_priv; | |
c1426bc7 | 71 | vb->v4l2_planes[plane].length = q->plane_sizes[plane]; |
e23ccc0a PO |
72 | } |
73 | ||
74 | return 0; | |
75 | free: | |
76 | /* Free already allocated memory if one of the allocations failed */ | |
a00d0266 | 77 | for (; plane > 0; --plane) { |
5931ffe3 | 78 | call_memop(q, put, vb->planes[plane - 1].mem_priv); |
a00d0266 MS |
79 | vb->planes[plane - 1].mem_priv = NULL; |
80 | } | |
e23ccc0a PO |
81 | |
82 | return -ENOMEM; | |
83 | } | |
84 | ||
85 | /** | |
86 | * __vb2_buf_mem_free() - free memory of the given buffer | |
87 | */ | |
88 | static void __vb2_buf_mem_free(struct vb2_buffer *vb) | |
89 | { | |
90 | struct vb2_queue *q = vb->vb2_queue; | |
91 | unsigned int plane; | |
92 | ||
93 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
5931ffe3 | 94 | call_memop(q, put, vb->planes[plane].mem_priv); |
e23ccc0a | 95 | vb->planes[plane].mem_priv = NULL; |
a00d0266 MS |
96 | dprintk(3, "Freed plane %d of buffer %d\n", plane, |
97 | vb->v4l2_buf.index); | |
e23ccc0a PO |
98 | } |
99 | } | |
100 | ||
101 | /** | |
102 | * __vb2_buf_userptr_put() - release userspace memory associated with | |
103 | * a USERPTR buffer | |
104 | */ | |
105 | static void __vb2_buf_userptr_put(struct vb2_buffer *vb) | |
106 | { | |
107 | struct vb2_queue *q = vb->vb2_queue; | |
108 | unsigned int plane; | |
109 | ||
110 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
a00d0266 MS |
111 | if (vb->planes[plane].mem_priv) |
112 | call_memop(q, put_userptr, vb->planes[plane].mem_priv); | |
113 | vb->planes[plane].mem_priv = NULL; | |
e23ccc0a PO |
114 | } |
115 | } | |
116 | ||
c5384048 SS |
117 | /** |
118 | * __vb2_plane_dmabuf_put() - release memory associated with | |
119 | * a DMABUF shared plane | |
120 | */ | |
121 | static void __vb2_plane_dmabuf_put(struct vb2_queue *q, struct vb2_plane *p) | |
122 | { | |
123 | if (!p->mem_priv) | |
124 | return; | |
125 | ||
126 | if (p->dbuf_mapped) | |
127 | call_memop(q, unmap_dmabuf, p->mem_priv); | |
128 | ||
129 | call_memop(q, detach_dmabuf, p->mem_priv); | |
130 | dma_buf_put(p->dbuf); | |
131 | memset(p, 0, sizeof(*p)); | |
132 | } | |
133 | ||
134 | /** | |
135 | * __vb2_buf_dmabuf_put() - release memory associated with | |
136 | * a DMABUF shared buffer | |
137 | */ | |
138 | static void __vb2_buf_dmabuf_put(struct vb2_buffer *vb) | |
139 | { | |
140 | struct vb2_queue *q = vb->vb2_queue; | |
141 | unsigned int plane; | |
142 | ||
143 | for (plane = 0; plane < vb->num_planes; ++plane) | |
144 | __vb2_plane_dmabuf_put(q, &vb->planes[plane]); | |
145 | } | |
146 | ||
a5e3d743 HV |
147 | /** |
148 | * __setup_lengths() - setup initial lengths for every plane in | |
149 | * every buffer on the queue | |
150 | */ | |
151 | static void __setup_lengths(struct vb2_queue *q, unsigned int n) | |
152 | { | |
153 | unsigned int buffer, plane; | |
154 | struct vb2_buffer *vb; | |
155 | ||
156 | for (buffer = q->num_buffers; buffer < q->num_buffers + n; ++buffer) { | |
157 | vb = q->bufs[buffer]; | |
158 | if (!vb) | |
159 | continue; | |
160 | ||
161 | for (plane = 0; plane < vb->num_planes; ++plane) | |
162 | vb->v4l2_planes[plane].length = q->plane_sizes[plane]; | |
163 | } | |
164 | } | |
165 | ||
e23ccc0a PO |
166 | /** |
167 | * __setup_offsets() - setup unique offsets ("cookies") for every plane in | |
168 | * every buffer on the queue | |
169 | */ | |
2d86401c | 170 | static void __setup_offsets(struct vb2_queue *q, unsigned int n) |
e23ccc0a PO |
171 | { |
172 | unsigned int buffer, plane; | |
173 | struct vb2_buffer *vb; | |
2d86401c | 174 | unsigned long off; |
e23ccc0a | 175 | |
2d86401c GL |
176 | if (q->num_buffers) { |
177 | struct v4l2_plane *p; | |
178 | vb = q->bufs[q->num_buffers - 1]; | |
179 | p = &vb->v4l2_planes[vb->num_planes - 1]; | |
180 | off = PAGE_ALIGN(p->m.mem_offset + p->length); | |
181 | } else { | |
182 | off = 0; | |
183 | } | |
184 | ||
185 | for (buffer = q->num_buffers; buffer < q->num_buffers + n; ++buffer) { | |
e23ccc0a PO |
186 | vb = q->bufs[buffer]; |
187 | if (!vb) | |
188 | continue; | |
189 | ||
190 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
191 | vb->v4l2_planes[plane].m.mem_offset = off; | |
192 | ||
193 | dprintk(3, "Buffer %d, plane %d offset 0x%08lx\n", | |
194 | buffer, plane, off); | |
195 | ||
196 | off += vb->v4l2_planes[plane].length; | |
197 | off = PAGE_ALIGN(off); | |
198 | } | |
199 | } | |
200 | } | |
201 | ||
202 | /** | |
203 | * __vb2_queue_alloc() - allocate videobuf buffer structures and (for MMAP type) | |
204 | * video buffer memory for all buffers/planes on the queue and initializes the | |
205 | * queue | |
206 | * | |
207 | * Returns the number of buffers successfully allocated. | |
208 | */ | |
209 | static int __vb2_queue_alloc(struct vb2_queue *q, enum v4l2_memory memory, | |
c1426bc7 | 210 | unsigned int num_buffers, unsigned int num_planes) |
e23ccc0a PO |
211 | { |
212 | unsigned int buffer; | |
213 | struct vb2_buffer *vb; | |
214 | int ret; | |
215 | ||
216 | for (buffer = 0; buffer < num_buffers; ++buffer) { | |
217 | /* Allocate videobuf buffer structures */ | |
218 | vb = kzalloc(q->buf_struct_size, GFP_KERNEL); | |
219 | if (!vb) { | |
220 | dprintk(1, "Memory alloc for buffer struct failed\n"); | |
221 | break; | |
222 | } | |
223 | ||
224 | /* Length stores number of planes for multiplanar buffers */ | |
225 | if (V4L2_TYPE_IS_MULTIPLANAR(q->type)) | |
226 | vb->v4l2_buf.length = num_planes; | |
227 | ||
228 | vb->state = VB2_BUF_STATE_DEQUEUED; | |
229 | vb->vb2_queue = q; | |
230 | vb->num_planes = num_planes; | |
2d86401c | 231 | vb->v4l2_buf.index = q->num_buffers + buffer; |
e23ccc0a PO |
232 | vb->v4l2_buf.type = q->type; |
233 | vb->v4l2_buf.memory = memory; | |
234 | ||
235 | /* Allocate video buffer memory for the MMAP type */ | |
236 | if (memory == V4L2_MEMORY_MMAP) { | |
c1426bc7 | 237 | ret = __vb2_buf_mem_alloc(vb); |
e23ccc0a PO |
238 | if (ret) { |
239 | dprintk(1, "Failed allocating memory for " | |
240 | "buffer %d\n", buffer); | |
241 | kfree(vb); | |
242 | break; | |
243 | } | |
244 | /* | |
245 | * Call the driver-provided buffer initialization | |
246 | * callback, if given. An error in initialization | |
247 | * results in queue setup failure. | |
248 | */ | |
249 | ret = call_qop(q, buf_init, vb); | |
250 | if (ret) { | |
251 | dprintk(1, "Buffer %d %p initialization" | |
252 | " failed\n", buffer, vb); | |
253 | __vb2_buf_mem_free(vb); | |
254 | kfree(vb); | |
255 | break; | |
256 | } | |
257 | } | |
258 | ||
2d86401c | 259 | q->bufs[q->num_buffers + buffer] = vb; |
e23ccc0a PO |
260 | } |
261 | ||
a5e3d743 | 262 | __setup_lengths(q, buffer); |
dc77523c PZ |
263 | if (memory == V4L2_MEMORY_MMAP) |
264 | __setup_offsets(q, buffer); | |
e23ccc0a PO |
265 | |
266 | dprintk(1, "Allocated %d buffers, %d plane(s) each\n", | |
2d86401c | 267 | buffer, num_planes); |
e23ccc0a PO |
268 | |
269 | return buffer; | |
270 | } | |
271 | ||
272 | /** | |
273 | * __vb2_free_mem() - release all video buffer memory for a given queue | |
274 | */ | |
2d86401c | 275 | static void __vb2_free_mem(struct vb2_queue *q, unsigned int buffers) |
e23ccc0a PO |
276 | { |
277 | unsigned int buffer; | |
278 | struct vb2_buffer *vb; | |
279 | ||
2d86401c GL |
280 | for (buffer = q->num_buffers - buffers; buffer < q->num_buffers; |
281 | ++buffer) { | |
e23ccc0a PO |
282 | vb = q->bufs[buffer]; |
283 | if (!vb) | |
284 | continue; | |
285 | ||
286 | /* Free MMAP buffers or release USERPTR buffers */ | |
287 | if (q->memory == V4L2_MEMORY_MMAP) | |
288 | __vb2_buf_mem_free(vb); | |
c5384048 SS |
289 | else if (q->memory == V4L2_MEMORY_DMABUF) |
290 | __vb2_buf_dmabuf_put(vb); | |
e23ccc0a PO |
291 | else |
292 | __vb2_buf_userptr_put(vb); | |
293 | } | |
294 | } | |
295 | ||
296 | /** | |
2d86401c GL |
297 | * __vb2_queue_free() - free buffers at the end of the queue - video memory and |
298 | * related information, if no buffers are left return the queue to an | |
299 | * uninitialized state. Might be called even if the queue has already been freed. | |
e23ccc0a | 300 | */ |
63faabfd | 301 | static int __vb2_queue_free(struct vb2_queue *q, unsigned int buffers) |
e23ccc0a PO |
302 | { |
303 | unsigned int buffer; | |
304 | ||
63faabfd HV |
305 | /* |
306 | * Sanity check: when preparing a buffer the queue lock is released for | |
307 | * a short while (see __buf_prepare for the details), which would allow | |
308 | * a race with a reqbufs which can call this function. Removing the | |
309 | * buffers from underneath __buf_prepare is obviously a bad idea, so we | |
310 | * check if any of the buffers is in the state PREPARING, and if so we | |
311 | * just return -EAGAIN. | |
312 | */ | |
313 | for (buffer = q->num_buffers - buffers; buffer < q->num_buffers; | |
314 | ++buffer) { | |
315 | if (q->bufs[buffer] == NULL) | |
316 | continue; | |
317 | if (q->bufs[buffer]->state == VB2_BUF_STATE_PREPARING) { | |
318 | dprintk(1, "reqbufs: preparing buffers, cannot free\n"); | |
319 | return -EAGAIN; | |
320 | } | |
321 | } | |
322 | ||
e23ccc0a PO |
323 | /* Call driver-provided cleanup function for each buffer, if provided */ |
324 | if (q->ops->buf_cleanup) { | |
2d86401c GL |
325 | for (buffer = q->num_buffers - buffers; buffer < q->num_buffers; |
326 | ++buffer) { | |
e23ccc0a PO |
327 | if (NULL == q->bufs[buffer]) |
328 | continue; | |
329 | q->ops->buf_cleanup(q->bufs[buffer]); | |
330 | } | |
331 | } | |
332 | ||
333 | /* Release video buffer memory */ | |
2d86401c | 334 | __vb2_free_mem(q, buffers); |
e23ccc0a PO |
335 | |
336 | /* Free videobuf buffers */ | |
2d86401c GL |
337 | for (buffer = q->num_buffers - buffers; buffer < q->num_buffers; |
338 | ++buffer) { | |
e23ccc0a PO |
339 | kfree(q->bufs[buffer]); |
340 | q->bufs[buffer] = NULL; | |
341 | } | |
342 | ||
2d86401c GL |
343 | q->num_buffers -= buffers; |
344 | if (!q->num_buffers) | |
345 | q->memory = 0; | |
bd50d999 | 346 | INIT_LIST_HEAD(&q->queued_list); |
63faabfd | 347 | return 0; |
e23ccc0a PO |
348 | } |
349 | ||
350 | /** | |
351 | * __verify_planes_array() - verify that the planes array passed in struct | |
352 | * v4l2_buffer from userspace can be safely used | |
353 | */ | |
2d86401c | 354 | static int __verify_planes_array(struct vb2_buffer *vb, const struct v4l2_buffer *b) |
e23ccc0a | 355 | { |
32a77260 HV |
356 | if (!V4L2_TYPE_IS_MULTIPLANAR(b->type)) |
357 | return 0; | |
358 | ||
e23ccc0a PO |
359 | /* Is memory for copying plane information present? */ |
360 | if (NULL == b->m.planes) { | |
361 | dprintk(1, "Multi-planar buffer passed but " | |
362 | "planes array not provided\n"); | |
363 | return -EINVAL; | |
364 | } | |
365 | ||
366 | if (b->length < vb->num_planes || b->length > VIDEO_MAX_PLANES) { | |
367 | dprintk(1, "Incorrect planes array length, " | |
368 | "expected %d, got %d\n", vb->num_planes, b->length); | |
369 | return -EINVAL; | |
370 | } | |
371 | ||
372 | return 0; | |
373 | } | |
374 | ||
8023ed09 LP |
375 | /** |
376 | * __verify_length() - Verify that the bytesused value for each plane fits in | |
377 | * the plane length and that the data offset doesn't exceed the bytesused value. | |
378 | */ | |
379 | static int __verify_length(struct vb2_buffer *vb, const struct v4l2_buffer *b) | |
380 | { | |
381 | unsigned int length; | |
382 | unsigned int plane; | |
383 | ||
384 | if (!V4L2_TYPE_IS_OUTPUT(b->type)) | |
385 | return 0; | |
386 | ||
387 | if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) { | |
388 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
389 | length = (b->memory == V4L2_MEMORY_USERPTR) | |
390 | ? b->m.planes[plane].length | |
391 | : vb->v4l2_planes[plane].length; | |
392 | ||
393 | if (b->m.planes[plane].bytesused > length) | |
394 | return -EINVAL; | |
3c5c23c5 SN |
395 | |
396 | if (b->m.planes[plane].data_offset > 0 && | |
397 | b->m.planes[plane].data_offset >= | |
8023ed09 LP |
398 | b->m.planes[plane].bytesused) |
399 | return -EINVAL; | |
400 | } | |
401 | } else { | |
402 | length = (b->memory == V4L2_MEMORY_USERPTR) | |
403 | ? b->length : vb->v4l2_planes[0].length; | |
404 | ||
405 | if (b->bytesused > length) | |
406 | return -EINVAL; | |
407 | } | |
408 | ||
409 | return 0; | |
410 | } | |
411 | ||
25a27d91 MS |
412 | /** |
413 | * __buffer_in_use() - return true if the buffer is in use and | |
414 | * the queue cannot be freed (by the means of REQBUFS(0)) call | |
415 | */ | |
416 | static bool __buffer_in_use(struct vb2_queue *q, struct vb2_buffer *vb) | |
417 | { | |
418 | unsigned int plane; | |
419 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
2c2dd6ac | 420 | void *mem_priv = vb->planes[plane].mem_priv; |
25a27d91 MS |
421 | /* |
422 | * If num_users() has not been provided, call_memop | |
423 | * will return 0, apparently nobody cares about this | |
424 | * case anyway. If num_users() returns more than 1, | |
425 | * we are not the only user of the plane's memory. | |
426 | */ | |
5931ffe3 | 427 | if (mem_priv && call_memop(q, num_users, mem_priv) > 1) |
25a27d91 MS |
428 | return true; |
429 | } | |
430 | return false; | |
431 | } | |
432 | ||
433 | /** | |
434 | * __buffers_in_use() - return true if any buffers on the queue are in use and | |
435 | * the queue cannot be freed (by the means of REQBUFS(0)) call | |
436 | */ | |
437 | static bool __buffers_in_use(struct vb2_queue *q) | |
438 | { | |
439 | unsigned int buffer; | |
440 | for (buffer = 0; buffer < q->num_buffers; ++buffer) { | |
441 | if (__buffer_in_use(q, q->bufs[buffer])) | |
442 | return true; | |
443 | } | |
444 | return false; | |
445 | } | |
446 | ||
e23ccc0a PO |
447 | /** |
448 | * __fill_v4l2_buffer() - fill in a struct v4l2_buffer with information to be | |
449 | * returned to userspace | |
450 | */ | |
32a77260 | 451 | static void __fill_v4l2_buffer(struct vb2_buffer *vb, struct v4l2_buffer *b) |
e23ccc0a PO |
452 | { |
453 | struct vb2_queue *q = vb->vb2_queue; | |
e23ccc0a | 454 | |
2b719d7b | 455 | /* Copy back data such as timestamp, flags, etc. */ |
e23ccc0a | 456 | memcpy(b, &vb->v4l2_buf, offsetof(struct v4l2_buffer, m)); |
2b719d7b | 457 | b->reserved2 = vb->v4l2_buf.reserved2; |
e23ccc0a PO |
458 | b->reserved = vb->v4l2_buf.reserved; |
459 | ||
460 | if (V4L2_TYPE_IS_MULTIPLANAR(q->type)) { | |
e23ccc0a PO |
461 | /* |
462 | * Fill in plane-related data if userspace provided an array | |
32a77260 | 463 | * for it. The caller has already verified memory and size. |
e23ccc0a | 464 | */ |
3c0b6061 | 465 | b->length = vb->num_planes; |
e23ccc0a PO |
466 | memcpy(b->m.planes, vb->v4l2_planes, |
467 | b->length * sizeof(struct v4l2_plane)); | |
468 | } else { | |
469 | /* | |
470 | * We use length and offset in v4l2_planes array even for | |
471 | * single-planar buffers, but userspace does not. | |
472 | */ | |
473 | b->length = vb->v4l2_planes[0].length; | |
474 | b->bytesused = vb->v4l2_planes[0].bytesused; | |
475 | if (q->memory == V4L2_MEMORY_MMAP) | |
476 | b->m.offset = vb->v4l2_planes[0].m.mem_offset; | |
477 | else if (q->memory == V4L2_MEMORY_USERPTR) | |
478 | b->m.userptr = vb->v4l2_planes[0].m.userptr; | |
c5384048 SS |
479 | else if (q->memory == V4L2_MEMORY_DMABUF) |
480 | b->m.fd = vb->v4l2_planes[0].m.fd; | |
e23ccc0a PO |
481 | } |
482 | ||
ea42c8ec MS |
483 | /* |
484 | * Clear any buffer state related flags. | |
485 | */ | |
1b18e7a0 | 486 | b->flags &= ~V4L2_BUFFER_MASK_FLAGS; |
6aa69f99 | 487 | b->flags |= q->timestamp_type; |
e23ccc0a PO |
488 | |
489 | switch (vb->state) { | |
490 | case VB2_BUF_STATE_QUEUED: | |
491 | case VB2_BUF_STATE_ACTIVE: | |
492 | b->flags |= V4L2_BUF_FLAG_QUEUED; | |
493 | break; | |
494 | case VB2_BUF_STATE_ERROR: | |
495 | b->flags |= V4L2_BUF_FLAG_ERROR; | |
496 | /* fall through */ | |
497 | case VB2_BUF_STATE_DONE: | |
498 | b->flags |= V4L2_BUF_FLAG_DONE; | |
499 | break; | |
ebc087d0 | 500 | case VB2_BUF_STATE_PREPARED: |
2d86401c GL |
501 | b->flags |= V4L2_BUF_FLAG_PREPARED; |
502 | break; | |
b18a8ff2 | 503 | case VB2_BUF_STATE_PREPARING: |
2d86401c | 504 | case VB2_BUF_STATE_DEQUEUED: |
e23ccc0a PO |
505 | /* nothing */ |
506 | break; | |
507 | } | |
508 | ||
25a27d91 | 509 | if (__buffer_in_use(q, vb)) |
e23ccc0a | 510 | b->flags |= V4L2_BUF_FLAG_MAPPED; |
e23ccc0a PO |
511 | } |
512 | ||
513 | /** | |
514 | * vb2_querybuf() - query video buffer information | |
515 | * @q: videobuf queue | |
516 | * @b: buffer struct passed from userspace to vidioc_querybuf handler | |
517 | * in driver | |
518 | * | |
519 | * Should be called from vidioc_querybuf ioctl handler in driver. | |
520 | * This function will verify the passed v4l2_buffer structure and fill the | |
521 | * relevant information for the userspace. | |
522 | * | |
523 | * The return values from this function are intended to be directly returned | |
524 | * from vidioc_querybuf handler in driver. | |
525 | */ | |
526 | int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b) | |
527 | { | |
528 | struct vb2_buffer *vb; | |
32a77260 | 529 | int ret; |
e23ccc0a PO |
530 | |
531 | if (b->type != q->type) { | |
532 | dprintk(1, "querybuf: wrong buffer type\n"); | |
533 | return -EINVAL; | |
534 | } | |
535 | ||
536 | if (b->index >= q->num_buffers) { | |
537 | dprintk(1, "querybuf: buffer index out of range\n"); | |
538 | return -EINVAL; | |
539 | } | |
540 | vb = q->bufs[b->index]; | |
32a77260 HV |
541 | ret = __verify_planes_array(vb, b); |
542 | if (!ret) | |
543 | __fill_v4l2_buffer(vb, b); | |
544 | return ret; | |
e23ccc0a PO |
545 | } |
546 | EXPORT_SYMBOL(vb2_querybuf); | |
547 | ||
548 | /** | |
549 | * __verify_userptr_ops() - verify that all memory operations required for | |
550 | * USERPTR queue type have been provided | |
551 | */ | |
552 | static int __verify_userptr_ops(struct vb2_queue *q) | |
553 | { | |
554 | if (!(q->io_modes & VB2_USERPTR) || !q->mem_ops->get_userptr || | |
555 | !q->mem_ops->put_userptr) | |
556 | return -EINVAL; | |
557 | ||
558 | return 0; | |
559 | } | |
560 | ||
561 | /** | |
562 | * __verify_mmap_ops() - verify that all memory operations required for | |
563 | * MMAP queue type have been provided | |
564 | */ | |
565 | static int __verify_mmap_ops(struct vb2_queue *q) | |
566 | { | |
567 | if (!(q->io_modes & VB2_MMAP) || !q->mem_ops->alloc || | |
568 | !q->mem_ops->put || !q->mem_ops->mmap) | |
569 | return -EINVAL; | |
570 | ||
571 | return 0; | |
572 | } | |
573 | ||
c5384048 SS |
574 | /** |
575 | * __verify_dmabuf_ops() - verify that all memory operations required for | |
576 | * DMABUF queue type have been provided | |
577 | */ | |
578 | static int __verify_dmabuf_ops(struct vb2_queue *q) | |
579 | { | |
580 | if (!(q->io_modes & VB2_DMABUF) || !q->mem_ops->attach_dmabuf || | |
581 | !q->mem_ops->detach_dmabuf || !q->mem_ops->map_dmabuf || | |
582 | !q->mem_ops->unmap_dmabuf) | |
583 | return -EINVAL; | |
584 | ||
585 | return 0; | |
586 | } | |
587 | ||
e23ccc0a | 588 | /** |
37d9ed94 HV |
589 | * __verify_memory_type() - Check whether the memory type and buffer type |
590 | * passed to a buffer operation are compatible with the queue. | |
591 | */ | |
592 | static int __verify_memory_type(struct vb2_queue *q, | |
593 | enum v4l2_memory memory, enum v4l2_buf_type type) | |
594 | { | |
c5384048 SS |
595 | if (memory != V4L2_MEMORY_MMAP && memory != V4L2_MEMORY_USERPTR && |
596 | memory != V4L2_MEMORY_DMABUF) { | |
37d9ed94 HV |
597 | dprintk(1, "reqbufs: unsupported memory type\n"); |
598 | return -EINVAL; | |
599 | } | |
600 | ||
601 | if (type != q->type) { | |
602 | dprintk(1, "reqbufs: requested type is incorrect\n"); | |
603 | return -EINVAL; | |
604 | } | |
605 | ||
606 | /* | |
607 | * Make sure all the required memory ops for given memory type | |
608 | * are available. | |
609 | */ | |
610 | if (memory == V4L2_MEMORY_MMAP && __verify_mmap_ops(q)) { | |
611 | dprintk(1, "reqbufs: MMAP for current setup unsupported\n"); | |
612 | return -EINVAL; | |
613 | } | |
614 | ||
615 | if (memory == V4L2_MEMORY_USERPTR && __verify_userptr_ops(q)) { | |
616 | dprintk(1, "reqbufs: USERPTR for current setup unsupported\n"); | |
617 | return -EINVAL; | |
618 | } | |
619 | ||
c5384048 SS |
620 | if (memory == V4L2_MEMORY_DMABUF && __verify_dmabuf_ops(q)) { |
621 | dprintk(1, "reqbufs: DMABUF for current setup unsupported\n"); | |
622 | return -EINVAL; | |
623 | } | |
624 | ||
37d9ed94 HV |
625 | /* |
626 | * Place the busy tests at the end: -EBUSY can be ignored when | |
627 | * create_bufs is called with count == 0, but count == 0 should still | |
628 | * do the memory and type validation. | |
629 | */ | |
630 | if (q->fileio) { | |
631 | dprintk(1, "reqbufs: file io in progress\n"); | |
632 | return -EBUSY; | |
633 | } | |
634 | return 0; | |
635 | } | |
636 | ||
637 | /** | |
638 | * __reqbufs() - Initiate streaming | |
e23ccc0a PO |
639 | * @q: videobuf2 queue |
640 | * @req: struct passed from userspace to vidioc_reqbufs handler in driver | |
641 | * | |
642 | * Should be called from vidioc_reqbufs ioctl handler of a driver. | |
643 | * This function: | |
644 | * 1) verifies streaming parameters passed from the userspace, | |
645 | * 2) sets up the queue, | |
646 | * 3) negotiates number of buffers and planes per buffer with the driver | |
647 | * to be used during streaming, | |
648 | * 4) allocates internal buffer structures (struct vb2_buffer), according to | |
649 | * the agreed parameters, | |
650 | * 5) for MMAP memory type, allocates actual video memory, using the | |
651 | * memory handling/allocation routines provided during queue initialization | |
652 | * | |
653 | * If req->count is 0, all the memory will be freed instead. | |
654 | * If the queue has been allocated previously (by a previous vb2_reqbufs) call | |
655 | * and the queue is not busy, memory will be reallocated. | |
656 | * | |
657 | * The return values from this function are intended to be directly returned | |
658 | * from vidioc_reqbufs handler in driver. | |
659 | */ | |
37d9ed94 | 660 | static int __reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req) |
e23ccc0a | 661 | { |
2d86401c | 662 | unsigned int num_buffers, allocated_buffers, num_planes = 0; |
37d9ed94 | 663 | int ret; |
e23ccc0a PO |
664 | |
665 | if (q->streaming) { | |
666 | dprintk(1, "reqbufs: streaming active\n"); | |
667 | return -EBUSY; | |
668 | } | |
669 | ||
29e3fbd8 | 670 | if (req->count == 0 || q->num_buffers != 0 || q->memory != req->memory) { |
e23ccc0a PO |
671 | /* |
672 | * We already have buffers allocated, so first check if they | |
673 | * are not in use and can be freed. | |
674 | */ | |
675 | if (q->memory == V4L2_MEMORY_MMAP && __buffers_in_use(q)) { | |
676 | dprintk(1, "reqbufs: memory in use, cannot free\n"); | |
677 | return -EBUSY; | |
678 | } | |
679 | ||
63faabfd HV |
680 | ret = __vb2_queue_free(q, q->num_buffers); |
681 | if (ret) | |
682 | return ret; | |
29e3fbd8 MS |
683 | |
684 | /* | |
685 | * In case of REQBUFS(0) return immediately without calling | |
686 | * driver's queue_setup() callback and allocating resources. | |
687 | */ | |
688 | if (req->count == 0) | |
689 | return 0; | |
e23ccc0a PO |
690 | } |
691 | ||
692 | /* | |
693 | * Make sure the requested values and current defaults are sane. | |
694 | */ | |
695 | num_buffers = min_t(unsigned int, req->count, VIDEO_MAX_FRAME); | |
c1426bc7 | 696 | memset(q->plane_sizes, 0, sizeof(q->plane_sizes)); |
e23ccc0a | 697 | memset(q->alloc_ctx, 0, sizeof(q->alloc_ctx)); |
13b14095 | 698 | q->memory = req->memory; |
e23ccc0a PO |
699 | |
700 | /* | |
701 | * Ask the driver how many buffers and planes per buffer it requires. | |
702 | * Driver also sets the size and allocator context for each plane. | |
703 | */ | |
fc714e70 | 704 | ret = call_qop(q, queue_setup, q, NULL, &num_buffers, &num_planes, |
c1426bc7 | 705 | q->plane_sizes, q->alloc_ctx); |
e23ccc0a PO |
706 | if (ret) |
707 | return ret; | |
708 | ||
709 | /* Finally, allocate buffers and video memory */ | |
c1426bc7 | 710 | ret = __vb2_queue_alloc(q, req->memory, num_buffers, num_planes); |
66072d4f MS |
711 | if (ret == 0) { |
712 | dprintk(1, "Memory allocation failed\n"); | |
713 | return -ENOMEM; | |
e23ccc0a PO |
714 | } |
715 | ||
2d86401c GL |
716 | allocated_buffers = ret; |
717 | ||
e23ccc0a PO |
718 | /* |
719 | * Check if driver can handle the allocated number of buffers. | |
720 | */ | |
2d86401c GL |
721 | if (allocated_buffers < num_buffers) { |
722 | num_buffers = allocated_buffers; | |
e23ccc0a | 723 | |
fc714e70 GL |
724 | ret = call_qop(q, queue_setup, q, NULL, &num_buffers, |
725 | &num_planes, q->plane_sizes, q->alloc_ctx); | |
e23ccc0a | 726 | |
2d86401c | 727 | if (!ret && allocated_buffers < num_buffers) |
e23ccc0a | 728 | ret = -ENOMEM; |
e23ccc0a PO |
729 | |
730 | /* | |
2d86401c GL |
731 | * Either the driver has accepted a smaller number of buffers, |
732 | * or .queue_setup() returned an error | |
e23ccc0a | 733 | */ |
2d86401c GL |
734 | } |
735 | ||
736 | q->num_buffers = allocated_buffers; | |
737 | ||
738 | if (ret < 0) { | |
739 | __vb2_queue_free(q, allocated_buffers); | |
740 | return ret; | |
e23ccc0a PO |
741 | } |
742 | ||
e23ccc0a PO |
743 | /* |
744 | * Return the number of successfully allocated buffers | |
745 | * to the userspace. | |
746 | */ | |
2d86401c | 747 | req->count = allocated_buffers; |
e23ccc0a PO |
748 | |
749 | return 0; | |
e23ccc0a | 750 | } |
37d9ed94 HV |
751 | |
752 | /** | |
753 | * vb2_reqbufs() - Wrapper for __reqbufs() that also verifies the memory and | |
754 | * type values. | |
755 | * @q: videobuf2 queue | |
756 | * @req: struct passed from userspace to vidioc_reqbufs handler in driver | |
757 | */ | |
758 | int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req) | |
759 | { | |
760 | int ret = __verify_memory_type(q, req->memory, req->type); | |
761 | ||
762 | return ret ? ret : __reqbufs(q, req); | |
763 | } | |
e23ccc0a PO |
764 | EXPORT_SYMBOL_GPL(vb2_reqbufs); |
765 | ||
2d86401c | 766 | /** |
37d9ed94 | 767 | * __create_bufs() - Allocate buffers and any required auxiliary structs |
2d86401c GL |
768 | * @q: videobuf2 queue |
769 | * @create: creation parameters, passed from userspace to vidioc_create_bufs | |
770 | * handler in driver | |
771 | * | |
772 | * Should be called from vidioc_create_bufs ioctl handler of a driver. | |
773 | * This function: | |
774 | * 1) verifies parameter sanity | |
775 | * 2) calls the .queue_setup() queue operation | |
776 | * 3) performs any necessary memory allocations | |
777 | * | |
778 | * The return values from this function are intended to be directly returned | |
779 | * from vidioc_create_bufs handler in driver. | |
780 | */ | |
37d9ed94 | 781 | static int __create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) |
2d86401c GL |
782 | { |
783 | unsigned int num_planes = 0, num_buffers, allocated_buffers; | |
37d9ed94 | 784 | int ret; |
2d86401c GL |
785 | |
786 | if (q->num_buffers == VIDEO_MAX_FRAME) { | |
787 | dprintk(1, "%s(): maximum number of buffers already allocated\n", | |
788 | __func__); | |
789 | return -ENOBUFS; | |
790 | } | |
791 | ||
2d86401c GL |
792 | if (!q->num_buffers) { |
793 | memset(q->plane_sizes, 0, sizeof(q->plane_sizes)); | |
794 | memset(q->alloc_ctx, 0, sizeof(q->alloc_ctx)); | |
795 | q->memory = create->memory; | |
796 | } | |
797 | ||
798 | num_buffers = min(create->count, VIDEO_MAX_FRAME - q->num_buffers); | |
799 | ||
800 | /* | |
801 | * Ask the driver, whether the requested number of buffers, planes per | |
802 | * buffer and their sizes are acceptable | |
803 | */ | |
804 | ret = call_qop(q, queue_setup, q, &create->format, &num_buffers, | |
805 | &num_planes, q->plane_sizes, q->alloc_ctx); | |
806 | if (ret) | |
807 | return ret; | |
808 | ||
809 | /* Finally, allocate buffers and video memory */ | |
810 | ret = __vb2_queue_alloc(q, create->memory, num_buffers, | |
811 | num_planes); | |
f05393d2 HV |
812 | if (ret == 0) { |
813 | dprintk(1, "Memory allocation failed\n"); | |
814 | return -ENOMEM; | |
2d86401c GL |
815 | } |
816 | ||
817 | allocated_buffers = ret; | |
818 | ||
819 | /* | |
820 | * Check if driver can handle the so far allocated number of buffers. | |
821 | */ | |
822 | if (ret < num_buffers) { | |
823 | num_buffers = ret; | |
824 | ||
825 | /* | |
826 | * q->num_buffers contains the total number of buffers, that the | |
827 | * queue driver has set up | |
828 | */ | |
829 | ret = call_qop(q, queue_setup, q, &create->format, &num_buffers, | |
830 | &num_planes, q->plane_sizes, q->alloc_ctx); | |
831 | ||
832 | if (!ret && allocated_buffers < num_buffers) | |
833 | ret = -ENOMEM; | |
834 | ||
835 | /* | |
836 | * Either the driver has accepted a smaller number of buffers, | |
837 | * or .queue_setup() returned an error | |
838 | */ | |
839 | } | |
840 | ||
841 | q->num_buffers += allocated_buffers; | |
842 | ||
843 | if (ret < 0) { | |
844 | __vb2_queue_free(q, allocated_buffers); | |
f05393d2 | 845 | return -ENOMEM; |
2d86401c GL |
846 | } |
847 | ||
848 | /* | |
849 | * Return the number of successfully allocated buffers | |
850 | * to the userspace. | |
851 | */ | |
852 | create->count = allocated_buffers; | |
853 | ||
854 | return 0; | |
855 | } | |
37d9ed94 HV |
856 | |
857 | /** | |
53aa3b19 NT |
858 | * vb2_create_bufs() - Wrapper for __create_bufs() that also verifies the |
859 | * memory and type values. | |
37d9ed94 HV |
860 | * @q: videobuf2 queue |
861 | * @create: creation parameters, passed from userspace to vidioc_create_bufs | |
862 | * handler in driver | |
863 | */ | |
864 | int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) | |
865 | { | |
866 | int ret = __verify_memory_type(q, create->memory, create->format.type); | |
867 | ||
868 | create->index = q->num_buffers; | |
f05393d2 HV |
869 | if (create->count == 0) |
870 | return ret != -EBUSY ? ret : 0; | |
37d9ed94 HV |
871 | return ret ? ret : __create_bufs(q, create); |
872 | } | |
2d86401c GL |
873 | EXPORT_SYMBOL_GPL(vb2_create_bufs); |
874 | ||
e23ccc0a PO |
875 | /** |
876 | * vb2_plane_vaddr() - Return a kernel virtual address of a given plane | |
877 | * @vb: vb2_buffer to which the plane in question belongs to | |
878 | * @plane_no: plane number for which the address is to be returned | |
879 | * | |
880 | * This function returns a kernel virtual address of a given plane if | |
881 | * such a mapping exist, NULL otherwise. | |
882 | */ | |
883 | void *vb2_plane_vaddr(struct vb2_buffer *vb, unsigned int plane_no) | |
884 | { | |
885 | struct vb2_queue *q = vb->vb2_queue; | |
886 | ||
a00d0266 | 887 | if (plane_no > vb->num_planes || !vb->planes[plane_no].mem_priv) |
e23ccc0a PO |
888 | return NULL; |
889 | ||
5931ffe3 | 890 | return call_memop(q, vaddr, vb->planes[plane_no].mem_priv); |
e23ccc0a PO |
891 | |
892 | } | |
893 | EXPORT_SYMBOL_GPL(vb2_plane_vaddr); | |
894 | ||
895 | /** | |
896 | * vb2_plane_cookie() - Return allocator specific cookie for the given plane | |
897 | * @vb: vb2_buffer to which the plane in question belongs to | |
898 | * @plane_no: plane number for which the cookie is to be returned | |
899 | * | |
900 | * This function returns an allocator specific cookie for a given plane if | |
901 | * available, NULL otherwise. The allocator should provide some simple static | |
902 | * inline function, which would convert this cookie to the allocator specific | |
903 | * type that can be used directly by the driver to access the buffer. This can | |
904 | * be for example physical address, pointer to scatter list or IOMMU mapping. | |
905 | */ | |
906 | void *vb2_plane_cookie(struct vb2_buffer *vb, unsigned int plane_no) | |
907 | { | |
908 | struct vb2_queue *q = vb->vb2_queue; | |
909 | ||
a00d0266 | 910 | if (plane_no > vb->num_planes || !vb->planes[plane_no].mem_priv) |
e23ccc0a PO |
911 | return NULL; |
912 | ||
5931ffe3 | 913 | return call_memop(q, cookie, vb->planes[plane_no].mem_priv); |
e23ccc0a PO |
914 | } |
915 | EXPORT_SYMBOL_GPL(vb2_plane_cookie); | |
916 | ||
917 | /** | |
918 | * vb2_buffer_done() - inform videobuf that an operation on a buffer is finished | |
919 | * @vb: vb2_buffer returned from the driver | |
920 | * @state: either VB2_BUF_STATE_DONE if the operation finished successfully | |
921 | * or VB2_BUF_STATE_ERROR if the operation finished with an error | |
922 | * | |
923 | * This function should be called by the driver after a hardware operation on | |
924 | * a buffer is finished and the buffer may be returned to userspace. The driver | |
925 | * cannot use this buffer anymore until it is queued back to it by videobuf | |
926 | * by the means of buf_queue callback. Only buffers previously queued to the | |
927 | * driver by buf_queue can be passed to this function. | |
928 | */ | |
929 | void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state) | |
930 | { | |
931 | struct vb2_queue *q = vb->vb2_queue; | |
932 | unsigned long flags; | |
3e0c2f20 | 933 | unsigned int plane; |
e23ccc0a PO |
934 | |
935 | if (vb->state != VB2_BUF_STATE_ACTIVE) | |
936 | return; | |
937 | ||
938 | if (state != VB2_BUF_STATE_DONE && state != VB2_BUF_STATE_ERROR) | |
939 | return; | |
940 | ||
941 | dprintk(4, "Done processing on buffer %d, state: %d\n", | |
9b6f5dc0 | 942 | vb->v4l2_buf.index, state); |
e23ccc0a | 943 | |
3e0c2f20 MS |
944 | /* sync buffers */ |
945 | for (plane = 0; plane < vb->num_planes; ++plane) | |
946 | call_memop(q, finish, vb->planes[plane].mem_priv); | |
947 | ||
e23ccc0a PO |
948 | /* Add the buffer to the done buffers list */ |
949 | spin_lock_irqsave(&q->done_lock, flags); | |
950 | vb->state = state; | |
951 | list_add_tail(&vb->done_entry, &q->done_list); | |
952 | atomic_dec(&q->queued_count); | |
953 | spin_unlock_irqrestore(&q->done_lock, flags); | |
954 | ||
955 | /* Inform any processes that may be waiting for buffers */ | |
956 | wake_up(&q->done_wq); | |
957 | } | |
958 | EXPORT_SYMBOL_GPL(vb2_buffer_done); | |
959 | ||
960 | /** | |
32a77260 HV |
961 | * __fill_vb2_buffer() - fill a vb2_buffer with information provided in a |
962 | * v4l2_buffer by the userspace. The caller has already verified that struct | |
963 | * v4l2_buffer has a valid number of planes. | |
e23ccc0a | 964 | */ |
32a77260 | 965 | static void __fill_vb2_buffer(struct vb2_buffer *vb, const struct v4l2_buffer *b, |
e23ccc0a PO |
966 | struct v4l2_plane *v4l2_planes) |
967 | { | |
968 | unsigned int plane; | |
e23ccc0a PO |
969 | |
970 | if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) { | |
e23ccc0a PO |
971 | /* Fill in driver-provided information for OUTPUT types */ |
972 | if (V4L2_TYPE_IS_OUTPUT(b->type)) { | |
973 | /* | |
974 | * Will have to go up to b->length when API starts | |
975 | * accepting variable number of planes. | |
976 | */ | |
977 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
978 | v4l2_planes[plane].bytesused = | |
979 | b->m.planes[plane].bytesused; | |
980 | v4l2_planes[plane].data_offset = | |
981 | b->m.planes[plane].data_offset; | |
982 | } | |
983 | } | |
984 | ||
985 | if (b->memory == V4L2_MEMORY_USERPTR) { | |
986 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
987 | v4l2_planes[plane].m.userptr = | |
988 | b->m.planes[plane].m.userptr; | |
989 | v4l2_planes[plane].length = | |
990 | b->m.planes[plane].length; | |
991 | } | |
992 | } | |
c5384048 SS |
993 | if (b->memory == V4L2_MEMORY_DMABUF) { |
994 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
995 | v4l2_planes[plane].m.fd = | |
996 | b->m.planes[plane].m.fd; | |
997 | v4l2_planes[plane].length = | |
998 | b->m.planes[plane].length; | |
999 | v4l2_planes[plane].data_offset = | |
1000 | b->m.planes[plane].data_offset; | |
1001 | } | |
1002 | } | |
e23ccc0a PO |
1003 | } else { |
1004 | /* | |
1005 | * Single-planar buffers do not use planes array, | |
1006 | * so fill in relevant v4l2_buffer struct fields instead. | |
1007 | * In videobuf we use our internal V4l2_planes struct for | |
1008 | * single-planar buffers as well, for simplicity. | |
1009 | */ | |
ac706bf7 | 1010 | if (V4L2_TYPE_IS_OUTPUT(b->type)) { |
e23ccc0a | 1011 | v4l2_planes[0].bytesused = b->bytesused; |
ac706bf7 LP |
1012 | v4l2_planes[0].data_offset = 0; |
1013 | } | |
e23ccc0a PO |
1014 | |
1015 | if (b->memory == V4L2_MEMORY_USERPTR) { | |
1016 | v4l2_planes[0].m.userptr = b->m.userptr; | |
1017 | v4l2_planes[0].length = b->length; | |
1018 | } | |
c5384048 SS |
1019 | |
1020 | if (b->memory == V4L2_MEMORY_DMABUF) { | |
1021 | v4l2_planes[0].m.fd = b->m.fd; | |
1022 | v4l2_planes[0].length = b->length; | |
1023 | v4l2_planes[0].data_offset = 0; | |
1024 | } | |
1025 | ||
e23ccc0a PO |
1026 | } |
1027 | ||
1028 | vb->v4l2_buf.field = b->field; | |
1029 | vb->v4l2_buf.timestamp = b->timestamp; | |
1b18e7a0 | 1030 | vb->v4l2_buf.flags = b->flags & ~V4L2_BUFFER_MASK_FLAGS; |
e23ccc0a PO |
1031 | } |
1032 | ||
1033 | /** | |
1034 | * __qbuf_userptr() - handle qbuf of a USERPTR buffer | |
1035 | */ | |
2d86401c | 1036 | static int __qbuf_userptr(struct vb2_buffer *vb, const struct v4l2_buffer *b) |
e23ccc0a PO |
1037 | { |
1038 | struct v4l2_plane planes[VIDEO_MAX_PLANES]; | |
1039 | struct vb2_queue *q = vb->vb2_queue; | |
1040 | void *mem_priv; | |
1041 | unsigned int plane; | |
1042 | int ret; | |
1043 | int write = !V4L2_TYPE_IS_OUTPUT(q->type); | |
1044 | ||
32a77260 HV |
1045 | /* Copy relevant information provided by the userspace */ |
1046 | __fill_vb2_buffer(vb, b, planes); | |
e23ccc0a PO |
1047 | |
1048 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
1049 | /* Skip the plane if already verified */ | |
f0b7c7fc MS |
1050 | if (vb->v4l2_planes[plane].m.userptr && |
1051 | vb->v4l2_planes[plane].m.userptr == planes[plane].m.userptr | |
e23ccc0a PO |
1052 | && vb->v4l2_planes[plane].length == planes[plane].length) |
1053 | continue; | |
1054 | ||
1055 | dprintk(3, "qbuf: userspace address for plane %d changed, " | |
1056 | "reacquiring memory\n", plane); | |
1057 | ||
c1426bc7 MS |
1058 | /* Check if the provided plane buffer is large enough */ |
1059 | if (planes[plane].length < q->plane_sizes[plane]) { | |
2484a7e2 SWK |
1060 | dprintk(1, "qbuf: provided buffer size %u is less than " |
1061 | "setup size %u for plane %d\n", | |
1062 | planes[plane].length, | |
1063 | q->plane_sizes[plane], plane); | |
4c2625db | 1064 | ret = -EINVAL; |
c1426bc7 MS |
1065 | goto err; |
1066 | } | |
1067 | ||
e23ccc0a PO |
1068 | /* Release previously acquired memory if present */ |
1069 | if (vb->planes[plane].mem_priv) | |
5931ffe3 | 1070 | call_memop(q, put_userptr, vb->planes[plane].mem_priv); |
e23ccc0a PO |
1071 | |
1072 | vb->planes[plane].mem_priv = NULL; | |
c1426bc7 MS |
1073 | vb->v4l2_planes[plane].m.userptr = 0; |
1074 | vb->v4l2_planes[plane].length = 0; | |
e23ccc0a PO |
1075 | |
1076 | /* Acquire each plane's memory */ | |
a00d0266 MS |
1077 | mem_priv = call_memop(q, get_userptr, q->alloc_ctx[plane], |
1078 | planes[plane].m.userptr, | |
1079 | planes[plane].length, write); | |
1080 | if (IS_ERR_OR_NULL(mem_priv)) { | |
1081 | dprintk(1, "qbuf: failed acquiring userspace " | |
e23ccc0a | 1082 | "memory for plane %d\n", plane); |
a00d0266 MS |
1083 | ret = mem_priv ? PTR_ERR(mem_priv) : -EINVAL; |
1084 | goto err; | |
e23ccc0a | 1085 | } |
a00d0266 | 1086 | vb->planes[plane].mem_priv = mem_priv; |
e23ccc0a PO |
1087 | } |
1088 | ||
1089 | /* | |
1090 | * Call driver-specific initialization on the newly acquired buffer, | |
1091 | * if provided. | |
1092 | */ | |
1093 | ret = call_qop(q, buf_init, vb); | |
1094 | if (ret) { | |
1095 | dprintk(1, "qbuf: buffer initialization failed\n"); | |
1096 | goto err; | |
1097 | } | |
1098 | ||
1099 | /* | |
1100 | * Now that everything is in order, copy relevant information | |
1101 | * provided by userspace. | |
1102 | */ | |
1103 | for (plane = 0; plane < vb->num_planes; ++plane) | |
1104 | vb->v4l2_planes[plane] = planes[plane]; | |
1105 | ||
1106 | return 0; | |
1107 | err: | |
1108 | /* In case of errors, release planes that were already acquired */ | |
c1426bc7 MS |
1109 | for (plane = 0; plane < vb->num_planes; ++plane) { |
1110 | if (vb->planes[plane].mem_priv) | |
5931ffe3 | 1111 | call_memop(q, put_userptr, vb->planes[plane].mem_priv); |
c1426bc7 MS |
1112 | vb->planes[plane].mem_priv = NULL; |
1113 | vb->v4l2_planes[plane].m.userptr = 0; | |
1114 | vb->v4l2_planes[plane].length = 0; | |
e23ccc0a PO |
1115 | } |
1116 | ||
1117 | return ret; | |
1118 | } | |
1119 | ||
1120 | /** | |
1121 | * __qbuf_mmap() - handle qbuf of an MMAP buffer | |
1122 | */ | |
2d86401c | 1123 | static int __qbuf_mmap(struct vb2_buffer *vb, const struct v4l2_buffer *b) |
e23ccc0a | 1124 | { |
32a77260 HV |
1125 | __fill_vb2_buffer(vb, b, vb->v4l2_planes); |
1126 | return 0; | |
e23ccc0a PO |
1127 | } |
1128 | ||
c5384048 SS |
1129 | /** |
1130 | * __qbuf_dmabuf() - handle qbuf of a DMABUF buffer | |
1131 | */ | |
1132 | static int __qbuf_dmabuf(struct vb2_buffer *vb, const struct v4l2_buffer *b) | |
1133 | { | |
1134 | struct v4l2_plane planes[VIDEO_MAX_PLANES]; | |
1135 | struct vb2_queue *q = vb->vb2_queue; | |
1136 | void *mem_priv; | |
1137 | unsigned int plane; | |
1138 | int ret; | |
1139 | int write = !V4L2_TYPE_IS_OUTPUT(q->type); | |
1140 | ||
6f546c5f | 1141 | /* Copy relevant information provided by the userspace */ |
c5384048 SS |
1142 | __fill_vb2_buffer(vb, b, planes); |
1143 | ||
1144 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
1145 | struct dma_buf *dbuf = dma_buf_get(planes[plane].m.fd); | |
1146 | ||
1147 | if (IS_ERR_OR_NULL(dbuf)) { | |
1148 | dprintk(1, "qbuf: invalid dmabuf fd for plane %d\n", | |
1149 | plane); | |
1150 | ret = -EINVAL; | |
1151 | goto err; | |
1152 | } | |
1153 | ||
1154 | /* use DMABUF size if length is not provided */ | |
1155 | if (planes[plane].length == 0) | |
1156 | planes[plane].length = dbuf->size; | |
1157 | ||
1158 | if (planes[plane].length < planes[plane].data_offset + | |
1159 | q->plane_sizes[plane]) { | |
77c0782e SWK |
1160 | dprintk(1, "qbuf: invalid dmabuf length for plane %d\n", |
1161 | plane); | |
c5384048 SS |
1162 | ret = -EINVAL; |
1163 | goto err; | |
1164 | } | |
1165 | ||
1166 | /* Skip the plane if already verified */ | |
1167 | if (dbuf == vb->planes[plane].dbuf && | |
1168 | vb->v4l2_planes[plane].length == planes[plane].length) { | |
1169 | dma_buf_put(dbuf); | |
1170 | continue; | |
1171 | } | |
1172 | ||
1173 | dprintk(1, "qbuf: buffer for plane %d changed\n", plane); | |
1174 | ||
1175 | /* Release previously acquired memory if present */ | |
1176 | __vb2_plane_dmabuf_put(q, &vb->planes[plane]); | |
1177 | memset(&vb->v4l2_planes[plane], 0, sizeof(struct v4l2_plane)); | |
1178 | ||
1179 | /* Acquire each plane's memory */ | |
1180 | mem_priv = call_memop(q, attach_dmabuf, q->alloc_ctx[plane], | |
1181 | dbuf, planes[plane].length, write); | |
1182 | if (IS_ERR(mem_priv)) { | |
1183 | dprintk(1, "qbuf: failed to attach dmabuf\n"); | |
1184 | ret = PTR_ERR(mem_priv); | |
1185 | dma_buf_put(dbuf); | |
1186 | goto err; | |
1187 | } | |
1188 | ||
1189 | vb->planes[plane].dbuf = dbuf; | |
1190 | vb->planes[plane].mem_priv = mem_priv; | |
1191 | } | |
1192 | ||
1193 | /* TODO: This pins the buffer(s) with dma_buf_map_attachment()).. but | |
1194 | * really we want to do this just before the DMA, not while queueing | |
1195 | * the buffer(s).. | |
1196 | */ | |
1197 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
1198 | ret = call_memop(q, map_dmabuf, vb->planes[plane].mem_priv); | |
1199 | if (ret) { | |
1200 | dprintk(1, "qbuf: failed to map dmabuf for plane %d\n", | |
1201 | plane); | |
1202 | goto err; | |
1203 | } | |
1204 | vb->planes[plane].dbuf_mapped = 1; | |
1205 | } | |
1206 | ||
1207 | /* | |
1208 | * Call driver-specific initialization on the newly acquired buffer, | |
1209 | * if provided. | |
1210 | */ | |
1211 | ret = call_qop(q, buf_init, vb); | |
1212 | if (ret) { | |
1213 | dprintk(1, "qbuf: buffer initialization failed\n"); | |
1214 | goto err; | |
1215 | } | |
1216 | ||
1217 | /* | |
1218 | * Now that everything is in order, copy relevant information | |
1219 | * provided by userspace. | |
1220 | */ | |
1221 | for (plane = 0; plane < vb->num_planes; ++plane) | |
1222 | vb->v4l2_planes[plane] = planes[plane]; | |
1223 | ||
1224 | return 0; | |
1225 | err: | |
1226 | /* In case of errors, release planes that were already acquired */ | |
1227 | __vb2_buf_dmabuf_put(vb); | |
1228 | ||
1229 | return ret; | |
1230 | } | |
1231 | ||
e23ccc0a PO |
1232 | /** |
1233 | * __enqueue_in_driver() - enqueue a vb2_buffer in driver for processing | |
1234 | */ | |
1235 | static void __enqueue_in_driver(struct vb2_buffer *vb) | |
1236 | { | |
1237 | struct vb2_queue *q = vb->vb2_queue; | |
3e0c2f20 | 1238 | unsigned int plane; |
e23ccc0a PO |
1239 | |
1240 | vb->state = VB2_BUF_STATE_ACTIVE; | |
1241 | atomic_inc(&q->queued_count); | |
3e0c2f20 MS |
1242 | |
1243 | /* sync buffers */ | |
1244 | for (plane = 0; plane < vb->num_planes; ++plane) | |
1245 | call_memop(q, prepare, vb->planes[plane].mem_priv); | |
1246 | ||
e23ccc0a PO |
1247 | q->ops->buf_queue(vb); |
1248 | } | |
1249 | ||
2d86401c | 1250 | static int __buf_prepare(struct vb2_buffer *vb, const struct v4l2_buffer *b) |
ebc087d0 GL |
1251 | { |
1252 | struct vb2_queue *q = vb->vb2_queue; | |
b18a8ff2 | 1253 | struct rw_semaphore *mmap_sem; |
ebc087d0 GL |
1254 | int ret; |
1255 | ||
8023ed09 | 1256 | ret = __verify_length(vb, b); |
3a9621b0 SN |
1257 | if (ret < 0) { |
1258 | dprintk(1, "%s(): plane parameters verification failed: %d\n", | |
1259 | __func__, ret); | |
8023ed09 | 1260 | return ret; |
3a9621b0 | 1261 | } |
8023ed09 | 1262 | |
b18a8ff2 | 1263 | vb->state = VB2_BUF_STATE_PREPARING; |
ebc087d0 GL |
1264 | switch (q->memory) { |
1265 | case V4L2_MEMORY_MMAP: | |
1266 | ret = __qbuf_mmap(vb, b); | |
1267 | break; | |
1268 | case V4L2_MEMORY_USERPTR: | |
b18a8ff2 | 1269 | /* |
f103b5d6 MCC |
1270 | * In case of user pointer buffers vb2 allocators need to get |
1271 | * direct access to userspace pages. This requires getting | |
1272 | * the mmap semaphore for read access in the current process | |
1273 | * structure. The same semaphore is taken before calling mmap | |
1274 | * operation, while both qbuf/prepare_buf and mmap are called | |
1275 | * by the driver or v4l2 core with the driver's lock held. | |
1276 | * To avoid an AB-BA deadlock (mmap_sem then driver's lock in | |
1277 | * mmap and driver's lock then mmap_sem in qbuf/prepare_buf), | |
1278 | * the videobuf2 core releases the driver's lock, takes | |
1279 | * mmap_sem and then takes the driver's lock again. | |
b18a8ff2 HV |
1280 | */ |
1281 | mmap_sem = ¤t->mm->mmap_sem; | |
1282 | call_qop(q, wait_prepare, q); | |
1283 | down_read(mmap_sem); | |
1284 | call_qop(q, wait_finish, q); | |
1285 | ||
ebc087d0 | 1286 | ret = __qbuf_userptr(vb, b); |
b18a8ff2 HV |
1287 | |
1288 | up_read(mmap_sem); | |
ebc087d0 | 1289 | break; |
c5384048 SS |
1290 | case V4L2_MEMORY_DMABUF: |
1291 | ret = __qbuf_dmabuf(vb, b); | |
1292 | break; | |
ebc087d0 GL |
1293 | default: |
1294 | WARN(1, "Invalid queue type\n"); | |
1295 | ret = -EINVAL; | |
1296 | } | |
1297 | ||
1298 | if (!ret) | |
1299 | ret = call_qop(q, buf_prepare, vb); | |
1300 | if (ret) | |
1301 | dprintk(1, "qbuf: buffer preparation failed: %d\n", ret); | |
b18a8ff2 | 1302 | vb->state = ret ? VB2_BUF_STATE_DEQUEUED : VB2_BUF_STATE_PREPARED; |
ebc087d0 GL |
1303 | |
1304 | return ret; | |
1305 | } | |
1306 | ||
012043b8 | 1307 | static int vb2_queue_or_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b, |
4138111a | 1308 | const char *opname) |
2d86401c | 1309 | { |
2d86401c | 1310 | if (b->type != q->type) { |
012043b8 | 1311 | dprintk(1, "%s(): invalid buffer type\n", opname); |
b18a8ff2 | 1312 | return -EINVAL; |
2d86401c GL |
1313 | } |
1314 | ||
1315 | if (b->index >= q->num_buffers) { | |
012043b8 | 1316 | dprintk(1, "%s(): buffer index out of range\n", opname); |
b18a8ff2 | 1317 | return -EINVAL; |
2d86401c GL |
1318 | } |
1319 | ||
4138111a | 1320 | if (q->bufs[b->index] == NULL) { |
2d86401c | 1321 | /* Should never happen */ |
012043b8 | 1322 | dprintk(1, "%s(): buffer is NULL\n", opname); |
b18a8ff2 | 1323 | return -EINVAL; |
2d86401c GL |
1324 | } |
1325 | ||
1326 | if (b->memory != q->memory) { | |
012043b8 | 1327 | dprintk(1, "%s(): invalid memory type\n", opname); |
b18a8ff2 | 1328 | return -EINVAL; |
2d86401c GL |
1329 | } |
1330 | ||
4138111a | 1331 | return __verify_planes_array(q->bufs[b->index], b); |
012043b8 | 1332 | } |
2d86401c | 1333 | |
e23ccc0a | 1334 | /** |
012043b8 | 1335 | * vb2_prepare_buf() - Pass ownership of a buffer from userspace to the kernel |
e23ccc0a | 1336 | * @q: videobuf2 queue |
012043b8 LP |
1337 | * @b: buffer structure passed from userspace to vidioc_prepare_buf |
1338 | * handler in driver | |
e23ccc0a | 1339 | * |
012043b8 | 1340 | * Should be called from vidioc_prepare_buf ioctl handler of a driver. |
e23ccc0a PO |
1341 | * This function: |
1342 | * 1) verifies the passed buffer, | |
012043b8 LP |
1343 | * 2) calls buf_prepare callback in the driver (if provided), in which |
1344 | * driver-specific buffer initialization can be performed, | |
e23ccc0a PO |
1345 | * |
1346 | * The return values from this function are intended to be directly returned | |
012043b8 | 1347 | * from vidioc_prepare_buf handler in driver. |
e23ccc0a | 1348 | */ |
012043b8 | 1349 | int vb2_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b) |
e23ccc0a | 1350 | { |
4138111a | 1351 | struct vb2_buffer *vb; |
b2f2f047 HV |
1352 | int ret; |
1353 | ||
1354 | if (q->fileio) { | |
1355 | dprintk(1, "%s(): file io in progress\n", __func__); | |
1356 | return -EBUSY; | |
1357 | } | |
4138111a | 1358 | |
b2f2f047 | 1359 | ret = vb2_queue_or_prepare_buf(q, b, "prepare_buf"); |
4138111a HV |
1360 | if (ret) |
1361 | return ret; | |
1362 | ||
1363 | vb = q->bufs[b->index]; | |
1364 | if (vb->state != VB2_BUF_STATE_DEQUEUED) { | |
1365 | dprintk(1, "%s(): invalid buffer state %d\n", __func__, | |
1366 | vb->state); | |
1367 | return -EINVAL; | |
1368 | } | |
1369 | ||
1370 | ret = __buf_prepare(vb, b); | |
1371 | if (!ret) { | |
1372 | /* Fill buffer information for the userspace */ | |
1373 | __fill_v4l2_buffer(vb, b); | |
1374 | ||
1375 | dprintk(1, "%s() of buffer %d succeeded\n", __func__, vb->v4l2_buf.index); | |
1376 | } | |
1377 | return ret; | |
012043b8 LP |
1378 | } |
1379 | EXPORT_SYMBOL_GPL(vb2_prepare_buf); | |
e23ccc0a | 1380 | |
02f142ec HV |
1381 | /** |
1382 | * vb2_start_streaming() - Attempt to start streaming. | |
1383 | * @q: videobuf2 queue | |
1384 | * | |
1385 | * If there are not enough buffers, then retry_start_streaming is set to | |
1386 | * 1 and 0 is returned. The next time a buffer is queued and | |
1387 | * retry_start_streaming is 1, this function will be called again to | |
1388 | * retry starting the DMA engine. | |
1389 | */ | |
1390 | static int vb2_start_streaming(struct vb2_queue *q) | |
1391 | { | |
1392 | int ret; | |
1393 | ||
1394 | /* Tell the driver to start streaming */ | |
1395 | ret = call_qop(q, start_streaming, q, atomic_read(&q->queued_count)); | |
1396 | ||
1397 | /* | |
1398 | * If there are not enough buffers queued to start streaming, then | |
1399 | * the start_streaming operation will return -ENOBUFS and you have to | |
1400 | * retry when the next buffer is queued. | |
1401 | */ | |
1402 | if (ret == -ENOBUFS) { | |
1403 | dprintk(1, "qbuf: not enough buffers, retry when more buffers are queued.\n"); | |
1404 | q->retry_start_streaming = 1; | |
1405 | return 0; | |
1406 | } | |
1407 | if (ret) | |
1408 | dprintk(1, "qbuf: driver refused to start streaming\n"); | |
1409 | else | |
1410 | q->retry_start_streaming = 0; | |
1411 | return ret; | |
1412 | } | |
1413 | ||
b2f2f047 | 1414 | static int vb2_internal_qbuf(struct vb2_queue *q, struct v4l2_buffer *b) |
012043b8 | 1415 | { |
4138111a HV |
1416 | int ret = vb2_queue_or_prepare_buf(q, b, "qbuf"); |
1417 | struct vb2_buffer *vb; | |
1418 | ||
1419 | if (ret) | |
1420 | return ret; | |
1421 | ||
1422 | vb = q->bufs[b->index]; | |
1423 | if (vb->state != VB2_BUF_STATE_DEQUEUED) { | |
1424 | dprintk(1, "%s(): invalid buffer state %d\n", __func__, | |
1425 | vb->state); | |
1426 | return -EINVAL; | |
1427 | } | |
e23ccc0a | 1428 | |
ebc087d0 GL |
1429 | switch (vb->state) { |
1430 | case VB2_BUF_STATE_DEQUEUED: | |
1431 | ret = __buf_prepare(vb, b); | |
1432 | if (ret) | |
012043b8 | 1433 | return ret; |
4138111a | 1434 | break; |
ebc087d0 GL |
1435 | case VB2_BUF_STATE_PREPARED: |
1436 | break; | |
b18a8ff2 HV |
1437 | case VB2_BUF_STATE_PREPARING: |
1438 | dprintk(1, "qbuf: buffer still being prepared\n"); | |
1439 | return -EINVAL; | |
ebc087d0 | 1440 | default: |
e23ccc0a | 1441 | dprintk(1, "qbuf: buffer already in use\n"); |
012043b8 | 1442 | return -EINVAL; |
e23ccc0a PO |
1443 | } |
1444 | ||
e23ccc0a PO |
1445 | /* |
1446 | * Add to the queued buffers list, a buffer will stay on it until | |
1447 | * dequeued in dqbuf. | |
1448 | */ | |
1449 | list_add_tail(&vb->queued_entry, &q->queued_list); | |
1450 | vb->state = VB2_BUF_STATE_QUEUED; | |
1451 | ||
1452 | /* | |
1453 | * If already streaming, give the buffer to driver for processing. | |
1454 | * If not, the buffer will be given to driver on next streamon. | |
1455 | */ | |
1456 | if (q->streaming) | |
1457 | __enqueue_in_driver(vb); | |
1458 | ||
4138111a HV |
1459 | /* Fill buffer information for the userspace */ |
1460 | __fill_v4l2_buffer(vb, b); | |
21db3e07 | 1461 | |
02f142ec HV |
1462 | if (q->retry_start_streaming) { |
1463 | ret = vb2_start_streaming(q); | |
1464 | if (ret) | |
1465 | return ret; | |
1466 | } | |
1467 | ||
4138111a HV |
1468 | dprintk(1, "%s() of buffer %d succeeded\n", __func__, vb->v4l2_buf.index); |
1469 | return 0; | |
e23ccc0a | 1470 | } |
b2f2f047 HV |
1471 | |
1472 | /** | |
1473 | * vb2_qbuf() - Queue a buffer from userspace | |
1474 | * @q: videobuf2 queue | |
1475 | * @b: buffer structure passed from userspace to vidioc_qbuf handler | |
1476 | * in driver | |
1477 | * | |
1478 | * Should be called from vidioc_qbuf ioctl handler of a driver. | |
1479 | * This function: | |
1480 | * 1) verifies the passed buffer, | |
1481 | * 2) if necessary, calls buf_prepare callback in the driver (if provided), in | |
1482 | * which driver-specific buffer initialization can be performed, | |
1483 | * 3) if streaming is on, queues the buffer in driver by the means of buf_queue | |
1484 | * callback for processing. | |
1485 | * | |
1486 | * The return values from this function are intended to be directly returned | |
1487 | * from vidioc_qbuf handler in driver. | |
1488 | */ | |
1489 | int vb2_qbuf(struct vb2_queue *q, struct v4l2_buffer *b) | |
1490 | { | |
1491 | if (q->fileio) { | |
1492 | dprintk(1, "%s(): file io in progress\n", __func__); | |
1493 | return -EBUSY; | |
1494 | } | |
1495 | ||
1496 | return vb2_internal_qbuf(q, b); | |
1497 | } | |
e23ccc0a PO |
1498 | EXPORT_SYMBOL_GPL(vb2_qbuf); |
1499 | ||
1500 | /** | |
1501 | * __vb2_wait_for_done_vb() - wait for a buffer to become available | |
1502 | * for dequeuing | |
1503 | * | |
1504 | * Will sleep if required for nonblocking == false. | |
1505 | */ | |
1506 | static int __vb2_wait_for_done_vb(struct vb2_queue *q, int nonblocking) | |
1507 | { | |
1508 | /* | |
1509 | * All operations on vb_done_list are performed under done_lock | |
1510 | * spinlock protection. However, buffers may be removed from | |
1511 | * it and returned to userspace only while holding both driver's | |
1512 | * lock and the done_lock spinlock. Thus we can be sure that as | |
1513 | * long as we hold the driver's lock, the list will remain not | |
1514 | * empty if list_empty() check succeeds. | |
1515 | */ | |
1516 | ||
1517 | for (;;) { | |
1518 | int ret; | |
1519 | ||
1520 | if (!q->streaming) { | |
1521 | dprintk(1, "Streaming off, will not wait for buffers\n"); | |
1522 | return -EINVAL; | |
1523 | } | |
1524 | ||
1525 | if (!list_empty(&q->done_list)) { | |
1526 | /* | |
1527 | * Found a buffer that we were waiting for. | |
1528 | */ | |
1529 | break; | |
1530 | } | |
1531 | ||
1532 | if (nonblocking) { | |
1533 | dprintk(1, "Nonblocking and no buffers to dequeue, " | |
1534 | "will not wait\n"); | |
1535 | return -EAGAIN; | |
1536 | } | |
1537 | ||
1538 | /* | |
1539 | * We are streaming and blocking, wait for another buffer to | |
1540 | * become ready or for streamoff. Driver's lock is released to | |
1541 | * allow streamoff or qbuf to be called while waiting. | |
1542 | */ | |
1543 | call_qop(q, wait_prepare, q); | |
1544 | ||
1545 | /* | |
1546 | * All locks have been released, it is safe to sleep now. | |
1547 | */ | |
1548 | dprintk(3, "Will sleep waiting for buffers\n"); | |
1549 | ret = wait_event_interruptible(q->done_wq, | |
1550 | !list_empty(&q->done_list) || !q->streaming); | |
1551 | ||
1552 | /* | |
1553 | * We need to reevaluate both conditions again after reacquiring | |
1554 | * the locks or return an error if one occurred. | |
1555 | */ | |
1556 | call_qop(q, wait_finish, q); | |
32a77260 HV |
1557 | if (ret) { |
1558 | dprintk(1, "Sleep was interrupted\n"); | |
e23ccc0a | 1559 | return ret; |
32a77260 | 1560 | } |
e23ccc0a PO |
1561 | } |
1562 | return 0; | |
1563 | } | |
1564 | ||
1565 | /** | |
1566 | * __vb2_get_done_vb() - get a buffer ready for dequeuing | |
1567 | * | |
1568 | * Will sleep if required for nonblocking == false. | |
1569 | */ | |
1570 | static int __vb2_get_done_vb(struct vb2_queue *q, struct vb2_buffer **vb, | |
32a77260 | 1571 | struct v4l2_buffer *b, int nonblocking) |
e23ccc0a PO |
1572 | { |
1573 | unsigned long flags; | |
1574 | int ret; | |
1575 | ||
1576 | /* | |
1577 | * Wait for at least one buffer to become available on the done_list. | |
1578 | */ | |
1579 | ret = __vb2_wait_for_done_vb(q, nonblocking); | |
1580 | if (ret) | |
1581 | return ret; | |
1582 | ||
1583 | /* | |
1584 | * Driver's lock has been held since we last verified that done_list | |
1585 | * is not empty, so no need for another list_empty(done_list) check. | |
1586 | */ | |
1587 | spin_lock_irqsave(&q->done_lock, flags); | |
1588 | *vb = list_first_entry(&q->done_list, struct vb2_buffer, done_entry); | |
32a77260 HV |
1589 | /* |
1590 | * Only remove the buffer from done_list if v4l2_buffer can handle all | |
1591 | * the planes. | |
1592 | */ | |
1593 | ret = __verify_planes_array(*vb, b); | |
1594 | if (!ret) | |
1595 | list_del(&(*vb)->done_entry); | |
e23ccc0a PO |
1596 | spin_unlock_irqrestore(&q->done_lock, flags); |
1597 | ||
32a77260 | 1598 | return ret; |
e23ccc0a PO |
1599 | } |
1600 | ||
1601 | /** | |
1602 | * vb2_wait_for_all_buffers() - wait until all buffers are given back to vb2 | |
1603 | * @q: videobuf2 queue | |
1604 | * | |
1605 | * This function will wait until all buffers that have been given to the driver | |
1606 | * by buf_queue() are given back to vb2 with vb2_buffer_done(). It doesn't call | |
1607 | * wait_prepare, wait_finish pair. It is intended to be called with all locks | |
1608 | * taken, for example from stop_streaming() callback. | |
1609 | */ | |
1610 | int vb2_wait_for_all_buffers(struct vb2_queue *q) | |
1611 | { | |
1612 | if (!q->streaming) { | |
1613 | dprintk(1, "Streaming off, will not wait for buffers\n"); | |
1614 | return -EINVAL; | |
1615 | } | |
1616 | ||
02f142ec HV |
1617 | if (!q->retry_start_streaming) |
1618 | wait_event(q->done_wq, !atomic_read(&q->queued_count)); | |
e23ccc0a PO |
1619 | return 0; |
1620 | } | |
1621 | EXPORT_SYMBOL_GPL(vb2_wait_for_all_buffers); | |
1622 | ||
c5384048 SS |
1623 | /** |
1624 | * __vb2_dqbuf() - bring back the buffer to the DEQUEUED state | |
1625 | */ | |
1626 | static void __vb2_dqbuf(struct vb2_buffer *vb) | |
1627 | { | |
1628 | struct vb2_queue *q = vb->vb2_queue; | |
1629 | unsigned int i; | |
1630 | ||
1631 | /* nothing to do if the buffer is already dequeued */ | |
1632 | if (vb->state == VB2_BUF_STATE_DEQUEUED) | |
1633 | return; | |
1634 | ||
1635 | vb->state = VB2_BUF_STATE_DEQUEUED; | |
1636 | ||
1637 | /* unmap DMABUF buffer */ | |
1638 | if (q->memory == V4L2_MEMORY_DMABUF) | |
1639 | for (i = 0; i < vb->num_planes; ++i) { | |
1640 | if (!vb->planes[i].dbuf_mapped) | |
1641 | continue; | |
1642 | call_memop(q, unmap_dmabuf, vb->planes[i].mem_priv); | |
1643 | vb->planes[i].dbuf_mapped = 0; | |
1644 | } | |
1645 | } | |
1646 | ||
b2f2f047 | 1647 | static int vb2_internal_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking) |
e23ccc0a PO |
1648 | { |
1649 | struct vb2_buffer *vb = NULL; | |
1650 | int ret; | |
1651 | ||
1652 | if (b->type != q->type) { | |
1653 | dprintk(1, "dqbuf: invalid buffer type\n"); | |
1654 | return -EINVAL; | |
1655 | } | |
32a77260 HV |
1656 | ret = __vb2_get_done_vb(q, &vb, b, nonblocking); |
1657 | if (ret < 0) | |
e23ccc0a | 1658 | return ret; |
e23ccc0a PO |
1659 | |
1660 | ret = call_qop(q, buf_finish, vb); | |
1661 | if (ret) { | |
1662 | dprintk(1, "dqbuf: buffer finish failed\n"); | |
1663 | return ret; | |
1664 | } | |
1665 | ||
1666 | switch (vb->state) { | |
1667 | case VB2_BUF_STATE_DONE: | |
1668 | dprintk(3, "dqbuf: Returning done buffer\n"); | |
1669 | break; | |
1670 | case VB2_BUF_STATE_ERROR: | |
1671 | dprintk(3, "dqbuf: Returning done buffer with errors\n"); | |
1672 | break; | |
1673 | default: | |
1674 | dprintk(1, "dqbuf: Invalid buffer state\n"); | |
1675 | return -EINVAL; | |
1676 | } | |
1677 | ||
1678 | /* Fill buffer information for the userspace */ | |
1679 | __fill_v4l2_buffer(vb, b); | |
1680 | /* Remove from videobuf queue */ | |
1681 | list_del(&vb->queued_entry); | |
c5384048 SS |
1682 | /* go back to dequeued state */ |
1683 | __vb2_dqbuf(vb); | |
e23ccc0a PO |
1684 | |
1685 | dprintk(1, "dqbuf of buffer %d, with state %d\n", | |
1686 | vb->v4l2_buf.index, vb->state); | |
1687 | ||
e23ccc0a PO |
1688 | return 0; |
1689 | } | |
b2f2f047 HV |
1690 | |
1691 | /** | |
1692 | * vb2_dqbuf() - Dequeue a buffer to the userspace | |
1693 | * @q: videobuf2 queue | |
1694 | * @b: buffer structure passed from userspace to vidioc_dqbuf handler | |
1695 | * in driver | |
1696 | * @nonblocking: if true, this call will not sleep waiting for a buffer if no | |
1697 | * buffers ready for dequeuing are present. Normally the driver | |
1698 | * would be passing (file->f_flags & O_NONBLOCK) here | |
1699 | * | |
1700 | * Should be called from vidioc_dqbuf ioctl handler of a driver. | |
1701 | * This function: | |
1702 | * 1) verifies the passed buffer, | |
1703 | * 2) calls buf_finish callback in the driver (if provided), in which | |
1704 | * driver can perform any additional operations that may be required before | |
1705 | * returning the buffer to userspace, such as cache sync, | |
1706 | * 3) the buffer struct members are filled with relevant information for | |
1707 | * the userspace. | |
1708 | * | |
1709 | * The return values from this function are intended to be directly returned | |
1710 | * from vidioc_dqbuf handler in driver. | |
1711 | */ | |
1712 | int vb2_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking) | |
1713 | { | |
1714 | if (q->fileio) { | |
1715 | dprintk(1, "dqbuf: file io in progress\n"); | |
1716 | return -EBUSY; | |
1717 | } | |
1718 | return vb2_internal_dqbuf(q, b, nonblocking); | |
1719 | } | |
e23ccc0a PO |
1720 | EXPORT_SYMBOL_GPL(vb2_dqbuf); |
1721 | ||
bd323e28 MS |
1722 | /** |
1723 | * __vb2_queue_cancel() - cancel and stop (pause) streaming | |
1724 | * | |
1725 | * Removes all queued buffers from driver's queue and all buffers queued by | |
1726 | * userspace from videobuf's queue. Returns to state after reqbufs. | |
1727 | */ | |
1728 | static void __vb2_queue_cancel(struct vb2_queue *q) | |
1729 | { | |
1730 | unsigned int i; | |
1731 | ||
02f142ec HV |
1732 | if (q->retry_start_streaming) { |
1733 | q->retry_start_streaming = 0; | |
1734 | q->streaming = 0; | |
1735 | } | |
1736 | ||
bd323e28 MS |
1737 | /* |
1738 | * Tell driver to stop all transactions and release all queued | |
1739 | * buffers. | |
1740 | */ | |
1741 | if (q->streaming) | |
1742 | call_qop(q, stop_streaming, q); | |
1743 | q->streaming = 0; | |
1744 | ||
1745 | /* | |
1746 | * Remove all buffers from videobuf's list... | |
1747 | */ | |
1748 | INIT_LIST_HEAD(&q->queued_list); | |
1749 | /* | |
1750 | * ...and done list; userspace will not receive any buffers it | |
1751 | * has not already dequeued before initiating cancel. | |
1752 | */ | |
1753 | INIT_LIST_HEAD(&q->done_list); | |
1754 | atomic_set(&q->queued_count, 0); | |
1755 | wake_up_all(&q->done_wq); | |
1756 | ||
1757 | /* | |
1758 | * Reinitialize all buffers for next use. | |
1759 | */ | |
1760 | for (i = 0; i < q->num_buffers; ++i) | |
c5384048 | 1761 | __vb2_dqbuf(q->bufs[i]); |
bd323e28 MS |
1762 | } |
1763 | ||
b2f2f047 | 1764 | static int vb2_internal_streamon(struct vb2_queue *q, enum v4l2_buf_type type) |
e23ccc0a PO |
1765 | { |
1766 | struct vb2_buffer *vb; | |
5db2c3ba | 1767 | int ret; |
e23ccc0a PO |
1768 | |
1769 | if (type != q->type) { | |
1770 | dprintk(1, "streamon: invalid stream type\n"); | |
1771 | return -EINVAL; | |
1772 | } | |
1773 | ||
1774 | if (q->streaming) { | |
f956035c RR |
1775 | dprintk(3, "streamon successful: already streaming\n"); |
1776 | return 0; | |
e23ccc0a PO |
1777 | } |
1778 | ||
1779 | /* | |
bd323e28 MS |
1780 | * If any buffers were queued before streamon, |
1781 | * we can now pass them to driver for processing. | |
e23ccc0a | 1782 | */ |
bd323e28 MS |
1783 | list_for_each_entry(vb, &q->queued_list, queued_entry) |
1784 | __enqueue_in_driver(vb); | |
e23ccc0a | 1785 | |
02f142ec HV |
1786 | /* Tell driver to start streaming. */ |
1787 | ret = vb2_start_streaming(q); | |
5db2c3ba | 1788 | if (ret) { |
bd323e28 | 1789 | __vb2_queue_cancel(q); |
5db2c3ba PO |
1790 | return ret; |
1791 | } | |
1792 | ||
1793 | q->streaming = 1; | |
e23ccc0a | 1794 | |
e23ccc0a PO |
1795 | dprintk(3, "Streamon successful\n"); |
1796 | return 0; | |
1797 | } | |
e23ccc0a PO |
1798 | |
1799 | /** | |
b2f2f047 | 1800 | * vb2_streamon - start streaming |
e23ccc0a | 1801 | * @q: videobuf2 queue |
b2f2f047 | 1802 | * @type: type argument passed from userspace to vidioc_streamon handler |
e23ccc0a | 1803 | * |
b2f2f047 | 1804 | * Should be called from vidioc_streamon handler of a driver. |
e23ccc0a | 1805 | * This function: |
b2f2f047 HV |
1806 | * 1) verifies current state |
1807 | * 2) passes any previously queued buffers to the driver and starts streaming | |
e23ccc0a | 1808 | * |
e23ccc0a | 1809 | * The return values from this function are intended to be directly returned |
b2f2f047 | 1810 | * from vidioc_streamon handler in the driver. |
e23ccc0a | 1811 | */ |
b2f2f047 | 1812 | int vb2_streamon(struct vb2_queue *q, enum v4l2_buf_type type) |
e23ccc0a | 1813 | { |
b25748fe | 1814 | if (q->fileio) { |
b2f2f047 | 1815 | dprintk(1, "streamon: file io in progress\n"); |
b25748fe MS |
1816 | return -EBUSY; |
1817 | } | |
b2f2f047 HV |
1818 | return vb2_internal_streamon(q, type); |
1819 | } | |
1820 | EXPORT_SYMBOL_GPL(vb2_streamon); | |
b25748fe | 1821 | |
b2f2f047 HV |
1822 | static int vb2_internal_streamoff(struct vb2_queue *q, enum v4l2_buf_type type) |
1823 | { | |
e23ccc0a PO |
1824 | if (type != q->type) { |
1825 | dprintk(1, "streamoff: invalid stream type\n"); | |
1826 | return -EINVAL; | |
1827 | } | |
1828 | ||
1829 | if (!q->streaming) { | |
f956035c RR |
1830 | dprintk(3, "streamoff successful: not streaming\n"); |
1831 | return 0; | |
e23ccc0a PO |
1832 | } |
1833 | ||
1834 | /* | |
1835 | * Cancel will pause streaming and remove all buffers from the driver | |
1836 | * and videobuf, effectively returning control over them to userspace. | |
1837 | */ | |
1838 | __vb2_queue_cancel(q); | |
1839 | ||
1840 | dprintk(3, "Streamoff successful\n"); | |
1841 | return 0; | |
1842 | } | |
b2f2f047 HV |
1843 | |
1844 | /** | |
1845 | * vb2_streamoff - stop streaming | |
1846 | * @q: videobuf2 queue | |
1847 | * @type: type argument passed from userspace to vidioc_streamoff handler | |
1848 | * | |
1849 | * Should be called from vidioc_streamoff handler of a driver. | |
1850 | * This function: | |
1851 | * 1) verifies current state, | |
1852 | * 2) stop streaming and dequeues any queued buffers, including those previously | |
1853 | * passed to the driver (after waiting for the driver to finish). | |
1854 | * | |
1855 | * This call can be used for pausing playback. | |
1856 | * The return values from this function are intended to be directly returned | |
1857 | * from vidioc_streamoff handler in the driver | |
1858 | */ | |
1859 | int vb2_streamoff(struct vb2_queue *q, enum v4l2_buf_type type) | |
1860 | { | |
1861 | if (q->fileio) { | |
1862 | dprintk(1, "streamoff: file io in progress\n"); | |
1863 | return -EBUSY; | |
1864 | } | |
1865 | return vb2_internal_streamoff(q, type); | |
1866 | } | |
e23ccc0a PO |
1867 | EXPORT_SYMBOL_GPL(vb2_streamoff); |
1868 | ||
1869 | /** | |
1870 | * __find_plane_by_offset() - find plane associated with the given offset off | |
1871 | */ | |
1872 | static int __find_plane_by_offset(struct vb2_queue *q, unsigned long off, | |
1873 | unsigned int *_buffer, unsigned int *_plane) | |
1874 | { | |
1875 | struct vb2_buffer *vb; | |
1876 | unsigned int buffer, plane; | |
1877 | ||
1878 | /* | |
1879 | * Go over all buffers and their planes, comparing the given offset | |
1880 | * with an offset assigned to each plane. If a match is found, | |
1881 | * return its buffer and plane numbers. | |
1882 | */ | |
1883 | for (buffer = 0; buffer < q->num_buffers; ++buffer) { | |
1884 | vb = q->bufs[buffer]; | |
1885 | ||
1886 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
1887 | if (vb->v4l2_planes[plane].m.mem_offset == off) { | |
1888 | *_buffer = buffer; | |
1889 | *_plane = plane; | |
1890 | return 0; | |
1891 | } | |
1892 | } | |
1893 | } | |
1894 | ||
1895 | return -EINVAL; | |
1896 | } | |
1897 | ||
83ae7c5a TS |
1898 | /** |
1899 | * vb2_expbuf() - Export a buffer as a file descriptor | |
1900 | * @q: videobuf2 queue | |
1901 | * @eb: export buffer structure passed from userspace to vidioc_expbuf | |
1902 | * handler in driver | |
1903 | * | |
1904 | * The return values from this function are intended to be directly returned | |
1905 | * from vidioc_expbuf handler in driver. | |
1906 | */ | |
1907 | int vb2_expbuf(struct vb2_queue *q, struct v4l2_exportbuffer *eb) | |
1908 | { | |
1909 | struct vb2_buffer *vb = NULL; | |
1910 | struct vb2_plane *vb_plane; | |
1911 | int ret; | |
1912 | struct dma_buf *dbuf; | |
1913 | ||
1914 | if (q->memory != V4L2_MEMORY_MMAP) { | |
1915 | dprintk(1, "Queue is not currently set up for mmap\n"); | |
1916 | return -EINVAL; | |
1917 | } | |
1918 | ||
1919 | if (!q->mem_ops->get_dmabuf) { | |
1920 | dprintk(1, "Queue does not support DMA buffer exporting\n"); | |
1921 | return -EINVAL; | |
1922 | } | |
1923 | ||
ea3aba84 PZ |
1924 | if (eb->flags & ~(O_CLOEXEC | O_ACCMODE)) { |
1925 | dprintk(1, "Queue does support only O_CLOEXEC and access mode flags\n"); | |
83ae7c5a TS |
1926 | return -EINVAL; |
1927 | } | |
1928 | ||
1929 | if (eb->type != q->type) { | |
1930 | dprintk(1, "qbuf: invalid buffer type\n"); | |
1931 | return -EINVAL; | |
1932 | } | |
1933 | ||
1934 | if (eb->index >= q->num_buffers) { | |
1935 | dprintk(1, "buffer index out of range\n"); | |
1936 | return -EINVAL; | |
1937 | } | |
1938 | ||
1939 | vb = q->bufs[eb->index]; | |
1940 | ||
1941 | if (eb->plane >= vb->num_planes) { | |
1942 | dprintk(1, "buffer plane out of range\n"); | |
1943 | return -EINVAL; | |
1944 | } | |
1945 | ||
1946 | vb_plane = &vb->planes[eb->plane]; | |
1947 | ||
ea3aba84 | 1948 | dbuf = call_memop(q, get_dmabuf, vb_plane->mem_priv, eb->flags & O_ACCMODE); |
83ae7c5a TS |
1949 | if (IS_ERR_OR_NULL(dbuf)) { |
1950 | dprintk(1, "Failed to export buffer %d, plane %d\n", | |
1951 | eb->index, eb->plane); | |
1952 | return -EINVAL; | |
1953 | } | |
1954 | ||
ea3aba84 | 1955 | ret = dma_buf_fd(dbuf, eb->flags & ~O_ACCMODE); |
83ae7c5a TS |
1956 | if (ret < 0) { |
1957 | dprintk(3, "buffer %d, plane %d failed to export (%d)\n", | |
1958 | eb->index, eb->plane, ret); | |
1959 | dma_buf_put(dbuf); | |
1960 | return ret; | |
1961 | } | |
1962 | ||
1963 | dprintk(3, "buffer %d, plane %d exported as %d descriptor\n", | |
1964 | eb->index, eb->plane, ret); | |
1965 | eb->fd = ret; | |
1966 | ||
1967 | return 0; | |
1968 | } | |
1969 | EXPORT_SYMBOL_GPL(vb2_expbuf); | |
1970 | ||
e23ccc0a PO |
1971 | /** |
1972 | * vb2_mmap() - map video buffers into application address space | |
1973 | * @q: videobuf2 queue | |
1974 | * @vma: vma passed to the mmap file operation handler in the driver | |
1975 | * | |
1976 | * Should be called from mmap file operation handler of a driver. | |
1977 | * This function maps one plane of one of the available video buffers to | |
1978 | * userspace. To map whole video memory allocated on reqbufs, this function | |
1979 | * has to be called once per each plane per each buffer previously allocated. | |
1980 | * | |
1981 | * When the userspace application calls mmap, it passes to it an offset returned | |
1982 | * to it earlier by the means of vidioc_querybuf handler. That offset acts as | |
1983 | * a "cookie", which is then used to identify the plane to be mapped. | |
1984 | * This function finds a plane with a matching offset and a mapping is performed | |
1985 | * by the means of a provided memory operation. | |
1986 | * | |
1987 | * The return values from this function are intended to be directly returned | |
1988 | * from the mmap handler in driver. | |
1989 | */ | |
1990 | int vb2_mmap(struct vb2_queue *q, struct vm_area_struct *vma) | |
1991 | { | |
1992 | unsigned long off = vma->vm_pgoff << PAGE_SHIFT; | |
e23ccc0a PO |
1993 | struct vb2_buffer *vb; |
1994 | unsigned int buffer, plane; | |
1995 | int ret; | |
7f841459 | 1996 | unsigned long length; |
e23ccc0a PO |
1997 | |
1998 | if (q->memory != V4L2_MEMORY_MMAP) { | |
1999 | dprintk(1, "Queue is not currently set up for mmap\n"); | |
2000 | return -EINVAL; | |
2001 | } | |
2002 | ||
2003 | /* | |
2004 | * Check memory area access mode. | |
2005 | */ | |
2006 | if (!(vma->vm_flags & VM_SHARED)) { | |
2007 | dprintk(1, "Invalid vma flags, VM_SHARED needed\n"); | |
2008 | return -EINVAL; | |
2009 | } | |
2010 | if (V4L2_TYPE_IS_OUTPUT(q->type)) { | |
2011 | if (!(vma->vm_flags & VM_WRITE)) { | |
2012 | dprintk(1, "Invalid vma flags, VM_WRITE needed\n"); | |
2013 | return -EINVAL; | |
2014 | } | |
2015 | } else { | |
2016 | if (!(vma->vm_flags & VM_READ)) { | |
2017 | dprintk(1, "Invalid vma flags, VM_READ needed\n"); | |
2018 | return -EINVAL; | |
2019 | } | |
2020 | } | |
2021 | ||
2022 | /* | |
2023 | * Find the plane corresponding to the offset passed by userspace. | |
2024 | */ | |
2025 | ret = __find_plane_by_offset(q, off, &buffer, &plane); | |
2026 | if (ret) | |
2027 | return ret; | |
2028 | ||
2029 | vb = q->bufs[buffer]; | |
e23ccc0a | 2030 | |
7f841459 MCC |
2031 | /* |
2032 | * MMAP requires page_aligned buffers. | |
2033 | * The buffer length was page_aligned at __vb2_buf_mem_alloc(), | |
2034 | * so, we need to do the same here. | |
2035 | */ | |
2036 | length = PAGE_ALIGN(vb->v4l2_planes[plane].length); | |
2037 | if (length < (vma->vm_end - vma->vm_start)) { | |
2038 | dprintk(1, | |
2039 | "MMAP invalid, as it would overflow buffer length\n"); | |
068a0df7 SWK |
2040 | return -EINVAL; |
2041 | } | |
2042 | ||
a00d0266 | 2043 | ret = call_memop(q, mmap, vb->planes[plane].mem_priv, vma); |
e23ccc0a PO |
2044 | if (ret) |
2045 | return ret; | |
2046 | ||
e23ccc0a PO |
2047 | dprintk(3, "Buffer %d, plane %d successfully mapped\n", buffer, plane); |
2048 | return 0; | |
2049 | } | |
2050 | EXPORT_SYMBOL_GPL(vb2_mmap); | |
2051 | ||
6f524ec1 SJ |
2052 | #ifndef CONFIG_MMU |
2053 | unsigned long vb2_get_unmapped_area(struct vb2_queue *q, | |
2054 | unsigned long addr, | |
2055 | unsigned long len, | |
2056 | unsigned long pgoff, | |
2057 | unsigned long flags) | |
2058 | { | |
2059 | unsigned long off = pgoff << PAGE_SHIFT; | |
2060 | struct vb2_buffer *vb; | |
2061 | unsigned int buffer, plane; | |
2062 | int ret; | |
2063 | ||
2064 | if (q->memory != V4L2_MEMORY_MMAP) { | |
2065 | dprintk(1, "Queue is not currently set up for mmap\n"); | |
2066 | return -EINVAL; | |
2067 | } | |
2068 | ||
2069 | /* | |
2070 | * Find the plane corresponding to the offset passed by userspace. | |
2071 | */ | |
2072 | ret = __find_plane_by_offset(q, off, &buffer, &plane); | |
2073 | if (ret) | |
2074 | return ret; | |
2075 | ||
2076 | vb = q->bufs[buffer]; | |
2077 | ||
2078 | return (unsigned long)vb2_plane_vaddr(vb, plane); | |
2079 | } | |
2080 | EXPORT_SYMBOL_GPL(vb2_get_unmapped_area); | |
2081 | #endif | |
2082 | ||
b25748fe MS |
2083 | static int __vb2_init_fileio(struct vb2_queue *q, int read); |
2084 | static int __vb2_cleanup_fileio(struct vb2_queue *q); | |
e23ccc0a PO |
2085 | |
2086 | /** | |
2087 | * vb2_poll() - implements poll userspace operation | |
2088 | * @q: videobuf2 queue | |
2089 | * @file: file argument passed to the poll file operation handler | |
2090 | * @wait: wait argument passed to the poll file operation handler | |
2091 | * | |
2092 | * This function implements poll file operation handler for a driver. | |
2093 | * For CAPTURE queues, if a buffer is ready to be dequeued, the userspace will | |
2094 | * be informed that the file descriptor of a video device is available for | |
2095 | * reading. | |
2096 | * For OUTPUT queues, if a buffer is ready to be dequeued, the file descriptor | |
2097 | * will be reported as available for writing. | |
2098 | * | |
95213ceb HV |
2099 | * If the driver uses struct v4l2_fh, then vb2_poll() will also check for any |
2100 | * pending events. | |
2101 | * | |
e23ccc0a PO |
2102 | * The return values from this function are intended to be directly returned |
2103 | * from poll handler in driver. | |
2104 | */ | |
2105 | unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait) | |
2106 | { | |
95213ceb | 2107 | struct video_device *vfd = video_devdata(file); |
bf5c7cbb | 2108 | unsigned long req_events = poll_requested_events(wait); |
e23ccc0a | 2109 | struct vb2_buffer *vb = NULL; |
95213ceb HV |
2110 | unsigned int res = 0; |
2111 | unsigned long flags; | |
2112 | ||
2113 | if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) { | |
2114 | struct v4l2_fh *fh = file->private_data; | |
2115 | ||
2116 | if (v4l2_event_pending(fh)) | |
2117 | res = POLLPRI; | |
2118 | else if (req_events & POLLPRI) | |
2119 | poll_wait(file, &fh->wait, wait); | |
2120 | } | |
e23ccc0a | 2121 | |
cd13823f HV |
2122 | if (!V4L2_TYPE_IS_OUTPUT(q->type) && !(req_events & (POLLIN | POLLRDNORM))) |
2123 | return res; | |
2124 | if (V4L2_TYPE_IS_OUTPUT(q->type) && !(req_events & (POLLOUT | POLLWRNORM))) | |
2125 | return res; | |
2126 | ||
b25748fe | 2127 | /* |
4ffabdb3 | 2128 | * Start file I/O emulator only if streaming API has not been used yet. |
b25748fe MS |
2129 | */ |
2130 | if (q->num_buffers == 0 && q->fileio == NULL) { | |
bf5c7cbb HV |
2131 | if (!V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_READ) && |
2132 | (req_events & (POLLIN | POLLRDNORM))) { | |
95213ceb HV |
2133 | if (__vb2_init_fileio(q, 1)) |
2134 | return res | POLLERR; | |
b25748fe | 2135 | } |
bf5c7cbb HV |
2136 | if (V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_WRITE) && |
2137 | (req_events & (POLLOUT | POLLWRNORM))) { | |
95213ceb HV |
2138 | if (__vb2_init_fileio(q, 0)) |
2139 | return res | POLLERR; | |
b25748fe MS |
2140 | /* |
2141 | * Write to OUTPUT queue can be done immediately. | |
2142 | */ | |
95213ceb | 2143 | return res | POLLOUT | POLLWRNORM; |
b25748fe MS |
2144 | } |
2145 | } | |
2146 | ||
e23ccc0a PO |
2147 | /* |
2148 | * There is nothing to wait for if no buffers have already been queued. | |
2149 | */ | |
2150 | if (list_empty(&q->queued_list)) | |
95213ceb | 2151 | return res | POLLERR; |
e23ccc0a | 2152 | |
412cb87d SWK |
2153 | if (list_empty(&q->done_list)) |
2154 | poll_wait(file, &q->done_wq, wait); | |
e23ccc0a PO |
2155 | |
2156 | /* | |
2157 | * Take first buffer available for dequeuing. | |
2158 | */ | |
2159 | spin_lock_irqsave(&q->done_lock, flags); | |
2160 | if (!list_empty(&q->done_list)) | |
2161 | vb = list_first_entry(&q->done_list, struct vb2_buffer, | |
2162 | done_entry); | |
2163 | spin_unlock_irqrestore(&q->done_lock, flags); | |
2164 | ||
2165 | if (vb && (vb->state == VB2_BUF_STATE_DONE | |
2166 | || vb->state == VB2_BUF_STATE_ERROR)) { | |
95213ceb HV |
2167 | return (V4L2_TYPE_IS_OUTPUT(q->type)) ? |
2168 | res | POLLOUT | POLLWRNORM : | |
2169 | res | POLLIN | POLLRDNORM; | |
e23ccc0a | 2170 | } |
95213ceb | 2171 | return res; |
e23ccc0a PO |
2172 | } |
2173 | EXPORT_SYMBOL_GPL(vb2_poll); | |
2174 | ||
2175 | /** | |
2176 | * vb2_queue_init() - initialize a videobuf2 queue | |
2177 | * @q: videobuf2 queue; this structure should be allocated in driver | |
2178 | * | |
2179 | * The vb2_queue structure should be allocated by the driver. The driver is | |
2180 | * responsible of clearing it's content and setting initial values for some | |
2181 | * required entries before calling this function. | |
2182 | * q->ops, q->mem_ops, q->type and q->io_modes are mandatory. Please refer | |
2183 | * to the struct vb2_queue description in include/media/videobuf2-core.h | |
2184 | * for more information. | |
2185 | */ | |
2186 | int vb2_queue_init(struct vb2_queue *q) | |
2187 | { | |
896f38f5 EG |
2188 | /* |
2189 | * Sanity check | |
2190 | */ | |
2191 | if (WARN_ON(!q) || | |
2192 | WARN_ON(!q->ops) || | |
2193 | WARN_ON(!q->mem_ops) || | |
2194 | WARN_ON(!q->type) || | |
2195 | WARN_ON(!q->io_modes) || | |
2196 | WARN_ON(!q->ops->queue_setup) || | |
6aa69f99 KD |
2197 | WARN_ON(!q->ops->buf_queue) || |
2198 | WARN_ON(q->timestamp_type & ~V4L2_BUF_FLAG_TIMESTAMP_MASK)) | |
896f38f5 | 2199 | return -EINVAL; |
e23ccc0a | 2200 | |
6aa69f99 KD |
2201 | /* Warn that the driver should choose an appropriate timestamp type */ |
2202 | WARN_ON(q->timestamp_type == V4L2_BUF_FLAG_TIMESTAMP_UNKNOWN); | |
2203 | ||
e23ccc0a PO |
2204 | INIT_LIST_HEAD(&q->queued_list); |
2205 | INIT_LIST_HEAD(&q->done_list); | |
2206 | spin_lock_init(&q->done_lock); | |
2207 | init_waitqueue_head(&q->done_wq); | |
2208 | ||
2209 | if (q->buf_struct_size == 0) | |
2210 | q->buf_struct_size = sizeof(struct vb2_buffer); | |
2211 | ||
2212 | return 0; | |
2213 | } | |
2214 | EXPORT_SYMBOL_GPL(vb2_queue_init); | |
2215 | ||
2216 | /** | |
2217 | * vb2_queue_release() - stop streaming, release the queue and free memory | |
2218 | * @q: videobuf2 queue | |
2219 | * | |
2220 | * This function stops streaming and performs necessary clean ups, including | |
2221 | * freeing video buffer memory. The driver is responsible for freeing | |
2222 | * the vb2_queue structure itself. | |
2223 | */ | |
2224 | void vb2_queue_release(struct vb2_queue *q) | |
2225 | { | |
b25748fe | 2226 | __vb2_cleanup_fileio(q); |
e23ccc0a | 2227 | __vb2_queue_cancel(q); |
2d86401c | 2228 | __vb2_queue_free(q, q->num_buffers); |
e23ccc0a PO |
2229 | } |
2230 | EXPORT_SYMBOL_GPL(vb2_queue_release); | |
2231 | ||
b25748fe MS |
2232 | /** |
2233 | * struct vb2_fileio_buf - buffer context used by file io emulator | |
2234 | * | |
2235 | * vb2 provides a compatibility layer and emulator of file io (read and | |
2236 | * write) calls on top of streaming API. This structure is used for | |
2237 | * tracking context related to the buffers. | |
2238 | */ | |
2239 | struct vb2_fileio_buf { | |
2240 | void *vaddr; | |
2241 | unsigned int size; | |
2242 | unsigned int pos; | |
2243 | unsigned int queued:1; | |
2244 | }; | |
2245 | ||
2246 | /** | |
2247 | * struct vb2_fileio_data - queue context used by file io emulator | |
2248 | * | |
2249 | * vb2 provides a compatibility layer and emulator of file io (read and | |
2250 | * write) calls on top of streaming API. For proper operation it required | |
2251 | * this structure to save the driver state between each call of the read | |
2252 | * or write function. | |
2253 | */ | |
2254 | struct vb2_fileio_data { | |
2255 | struct v4l2_requestbuffers req; | |
2256 | struct v4l2_buffer b; | |
2257 | struct vb2_fileio_buf bufs[VIDEO_MAX_FRAME]; | |
2258 | unsigned int index; | |
2259 | unsigned int q_count; | |
2260 | unsigned int dq_count; | |
2261 | unsigned int flags; | |
2262 | }; | |
2263 | ||
2264 | /** | |
2265 | * __vb2_init_fileio() - initialize file io emulator | |
2266 | * @q: videobuf2 queue | |
2267 | * @read: mode selector (1 means read, 0 means write) | |
2268 | */ | |
2269 | static int __vb2_init_fileio(struct vb2_queue *q, int read) | |
2270 | { | |
2271 | struct vb2_fileio_data *fileio; | |
2272 | int i, ret; | |
2273 | unsigned int count = 0; | |
2274 | ||
2275 | /* | |
2276 | * Sanity check | |
2277 | */ | |
2278 | if ((read && !(q->io_modes & VB2_READ)) || | |
2279 | (!read && !(q->io_modes & VB2_WRITE))) | |
2280 | BUG(); | |
2281 | ||
2282 | /* | |
2283 | * Check if device supports mapping buffers to kernel virtual space. | |
2284 | */ | |
2285 | if (!q->mem_ops->vaddr) | |
2286 | return -EBUSY; | |
2287 | ||
2288 | /* | |
2289 | * Check if streaming api has not been already activated. | |
2290 | */ | |
2291 | if (q->streaming || q->num_buffers > 0) | |
2292 | return -EBUSY; | |
2293 | ||
2294 | /* | |
2295 | * Start with count 1, driver can increase it in queue_setup() | |
2296 | */ | |
2297 | count = 1; | |
2298 | ||
2299 | dprintk(3, "setting up file io: mode %s, count %d, flags %08x\n", | |
2300 | (read) ? "read" : "write", count, q->io_flags); | |
2301 | ||
2302 | fileio = kzalloc(sizeof(struct vb2_fileio_data), GFP_KERNEL); | |
2303 | if (fileio == NULL) | |
2304 | return -ENOMEM; | |
2305 | ||
2306 | fileio->flags = q->io_flags; | |
2307 | ||
2308 | /* | |
2309 | * Request buffers and use MMAP type to force driver | |
2310 | * to allocate buffers by itself. | |
2311 | */ | |
2312 | fileio->req.count = count; | |
2313 | fileio->req.memory = V4L2_MEMORY_MMAP; | |
2314 | fileio->req.type = q->type; | |
2315 | ret = vb2_reqbufs(q, &fileio->req); | |
2316 | if (ret) | |
2317 | goto err_kfree; | |
2318 | ||
2319 | /* | |
2320 | * Check if plane_count is correct | |
2321 | * (multiplane buffers are not supported). | |
2322 | */ | |
2323 | if (q->bufs[0]->num_planes != 1) { | |
b25748fe MS |
2324 | ret = -EBUSY; |
2325 | goto err_reqbufs; | |
2326 | } | |
2327 | ||
2328 | /* | |
2329 | * Get kernel address of each buffer. | |
2330 | */ | |
2331 | for (i = 0; i < q->num_buffers; i++) { | |
2332 | fileio->bufs[i].vaddr = vb2_plane_vaddr(q->bufs[i], 0); | |
5dd6946c WY |
2333 | if (fileio->bufs[i].vaddr == NULL) { |
2334 | ret = -EINVAL; | |
b25748fe | 2335 | goto err_reqbufs; |
5dd6946c | 2336 | } |
b25748fe MS |
2337 | fileio->bufs[i].size = vb2_plane_size(q->bufs[i], 0); |
2338 | } | |
2339 | ||
2340 | /* | |
2341 | * Read mode requires pre queuing of all buffers. | |
2342 | */ | |
2343 | if (read) { | |
2344 | /* | |
2345 | * Queue all buffers. | |
2346 | */ | |
2347 | for (i = 0; i < q->num_buffers; i++) { | |
2348 | struct v4l2_buffer *b = &fileio->b; | |
2349 | memset(b, 0, sizeof(*b)); | |
2350 | b->type = q->type; | |
2351 | b->memory = q->memory; | |
2352 | b->index = i; | |
2353 | ret = vb2_qbuf(q, b); | |
2354 | if (ret) | |
2355 | goto err_reqbufs; | |
2356 | fileio->bufs[i].queued = 1; | |
2357 | } | |
88e26870 | 2358 | fileio->index = q->num_buffers; |
b25748fe MS |
2359 | } |
2360 | ||
02f142ec HV |
2361 | /* |
2362 | * Start streaming. | |
2363 | */ | |
2364 | ret = vb2_streamon(q, q->type); | |
2365 | if (ret) | |
2366 | goto err_reqbufs; | |
2367 | ||
b25748fe MS |
2368 | q->fileio = fileio; |
2369 | ||
2370 | return ret; | |
2371 | ||
2372 | err_reqbufs: | |
a67e1722 | 2373 | fileio->req.count = 0; |
b25748fe MS |
2374 | vb2_reqbufs(q, &fileio->req); |
2375 | ||
2376 | err_kfree: | |
2377 | kfree(fileio); | |
2378 | return ret; | |
2379 | } | |
2380 | ||
2381 | /** | |
2382 | * __vb2_cleanup_fileio() - free resourced used by file io emulator | |
2383 | * @q: videobuf2 queue | |
2384 | */ | |
2385 | static int __vb2_cleanup_fileio(struct vb2_queue *q) | |
2386 | { | |
2387 | struct vb2_fileio_data *fileio = q->fileio; | |
2388 | ||
2389 | if (fileio) { | |
b2f2f047 | 2390 | vb2_internal_streamoff(q, q->type); |
b25748fe | 2391 | q->fileio = NULL; |
b25748fe MS |
2392 | fileio->req.count = 0; |
2393 | vb2_reqbufs(q, &fileio->req); | |
2394 | kfree(fileio); | |
2395 | dprintk(3, "file io emulator closed\n"); | |
2396 | } | |
2397 | return 0; | |
2398 | } | |
2399 | ||
2400 | /** | |
2401 | * __vb2_perform_fileio() - perform a single file io (read or write) operation | |
2402 | * @q: videobuf2 queue | |
2403 | * @data: pointed to target userspace buffer | |
2404 | * @count: number of bytes to read or write | |
2405 | * @ppos: file handle position tracking pointer | |
2406 | * @nonblock: mode selector (1 means blocking calls, 0 means nonblocking) | |
2407 | * @read: access mode selector (1 means read, 0 means write) | |
2408 | */ | |
2409 | static size_t __vb2_perform_fileio(struct vb2_queue *q, char __user *data, size_t count, | |
2410 | loff_t *ppos, int nonblock, int read) | |
2411 | { | |
2412 | struct vb2_fileio_data *fileio; | |
2413 | struct vb2_fileio_buf *buf; | |
2414 | int ret, index; | |
2415 | ||
08b99e26 | 2416 | dprintk(3, "file io: mode %s, offset %ld, count %zd, %sblocking\n", |
b25748fe MS |
2417 | read ? "read" : "write", (long)*ppos, count, |
2418 | nonblock ? "non" : ""); | |
2419 | ||
2420 | if (!data) | |
2421 | return -EINVAL; | |
2422 | ||
2423 | /* | |
2424 | * Initialize emulator on first call. | |
2425 | */ | |
2426 | if (!q->fileio) { | |
2427 | ret = __vb2_init_fileio(q, read); | |
2428 | dprintk(3, "file io: vb2_init_fileio result: %d\n", ret); | |
2429 | if (ret) | |
2430 | return ret; | |
2431 | } | |
2432 | fileio = q->fileio; | |
2433 | ||
b25748fe MS |
2434 | /* |
2435 | * Check if we need to dequeue the buffer. | |
2436 | */ | |
88e26870 HV |
2437 | index = fileio->index; |
2438 | if (index >= q->num_buffers) { | |
b25748fe MS |
2439 | /* |
2440 | * Call vb2_dqbuf to get buffer back. | |
2441 | */ | |
2442 | memset(&fileio->b, 0, sizeof(fileio->b)); | |
2443 | fileio->b.type = q->type; | |
2444 | fileio->b.memory = q->memory; | |
b2f2f047 | 2445 | ret = vb2_internal_dqbuf(q, &fileio->b, nonblock); |
b25748fe MS |
2446 | dprintk(5, "file io: vb2_dqbuf result: %d\n", ret); |
2447 | if (ret) | |
b2f2f047 | 2448 | return ret; |
b25748fe MS |
2449 | fileio->dq_count += 1; |
2450 | ||
88e26870 HV |
2451 | index = fileio->b.index; |
2452 | buf = &fileio->bufs[index]; | |
2453 | ||
b25748fe MS |
2454 | /* |
2455 | * Get number of bytes filled by the driver | |
2456 | */ | |
88e26870 | 2457 | buf->pos = 0; |
b25748fe | 2458 | buf->queued = 0; |
88e26870 HV |
2459 | buf->size = read ? vb2_get_plane_payload(q->bufs[index], 0) |
2460 | : vb2_plane_size(q->bufs[index], 0); | |
2461 | } else { | |
2462 | buf = &fileio->bufs[index]; | |
b25748fe MS |
2463 | } |
2464 | ||
2465 | /* | |
2466 | * Limit count on last few bytes of the buffer. | |
2467 | */ | |
2468 | if (buf->pos + count > buf->size) { | |
2469 | count = buf->size - buf->pos; | |
08b99e26 | 2470 | dprintk(5, "reducing read count: %zd\n", count); |
b25748fe MS |
2471 | } |
2472 | ||
2473 | /* | |
2474 | * Transfer data to userspace. | |
2475 | */ | |
08b99e26 | 2476 | dprintk(3, "file io: copying %zd bytes - buffer %d, offset %u\n", |
b25748fe MS |
2477 | count, index, buf->pos); |
2478 | if (read) | |
2479 | ret = copy_to_user(data, buf->vaddr + buf->pos, count); | |
2480 | else | |
2481 | ret = copy_from_user(buf->vaddr + buf->pos, data, count); | |
2482 | if (ret) { | |
2483 | dprintk(3, "file io: error copying data\n"); | |
b2f2f047 | 2484 | return -EFAULT; |
b25748fe MS |
2485 | } |
2486 | ||
2487 | /* | |
2488 | * Update counters. | |
2489 | */ | |
2490 | buf->pos += count; | |
2491 | *ppos += count; | |
2492 | ||
2493 | /* | |
2494 | * Queue next buffer if required. | |
2495 | */ | |
2496 | if (buf->pos == buf->size || | |
2497 | (!read && (fileio->flags & VB2_FILEIO_WRITE_IMMEDIATELY))) { | |
2498 | /* | |
2499 | * Check if this is the last buffer to read. | |
2500 | */ | |
2501 | if (read && (fileio->flags & VB2_FILEIO_READ_ONCE) && | |
2502 | fileio->dq_count == 1) { | |
2503 | dprintk(3, "file io: read limit reached\n"); | |
b25748fe MS |
2504 | return __vb2_cleanup_fileio(q); |
2505 | } | |
2506 | ||
2507 | /* | |
2508 | * Call vb2_qbuf and give buffer to the driver. | |
2509 | */ | |
2510 | memset(&fileio->b, 0, sizeof(fileio->b)); | |
2511 | fileio->b.type = q->type; | |
2512 | fileio->b.memory = q->memory; | |
2513 | fileio->b.index = index; | |
2514 | fileio->b.bytesused = buf->pos; | |
b2f2f047 | 2515 | ret = vb2_internal_qbuf(q, &fileio->b); |
b25748fe MS |
2516 | dprintk(5, "file io: vb2_dbuf result: %d\n", ret); |
2517 | if (ret) | |
b2f2f047 | 2518 | return ret; |
b25748fe MS |
2519 | |
2520 | /* | |
2521 | * Buffer has been queued, update the status | |
2522 | */ | |
2523 | buf->pos = 0; | |
2524 | buf->queued = 1; | |
88e26870 | 2525 | buf->size = vb2_plane_size(q->bufs[index], 0); |
b25748fe | 2526 | fileio->q_count += 1; |
88e26870 HV |
2527 | if (fileio->index < q->num_buffers) |
2528 | fileio->index++; | |
b25748fe MS |
2529 | } |
2530 | ||
2531 | /* | |
2532 | * Return proper number of bytes processed. | |
2533 | */ | |
2534 | if (ret == 0) | |
2535 | ret = count; | |
b25748fe MS |
2536 | return ret; |
2537 | } | |
2538 | ||
2539 | size_t vb2_read(struct vb2_queue *q, char __user *data, size_t count, | |
2540 | loff_t *ppos, int nonblocking) | |
2541 | { | |
2542 | return __vb2_perform_fileio(q, data, count, ppos, nonblocking, 1); | |
2543 | } | |
2544 | EXPORT_SYMBOL_GPL(vb2_read); | |
2545 | ||
819585bc | 2546 | size_t vb2_write(struct vb2_queue *q, const char __user *data, size_t count, |
b25748fe MS |
2547 | loff_t *ppos, int nonblocking) |
2548 | { | |
819585bc RR |
2549 | return __vb2_perform_fileio(q, (char __user *) data, count, |
2550 | ppos, nonblocking, 0); | |
b25748fe MS |
2551 | } |
2552 | EXPORT_SYMBOL_GPL(vb2_write); | |
2553 | ||
4c1ffcaa HV |
2554 | |
2555 | /* | |
2556 | * The following functions are not part of the vb2 core API, but are helper | |
2557 | * functions that plug into struct v4l2_ioctl_ops, struct v4l2_file_operations | |
2558 | * and struct vb2_ops. | |
2559 | * They contain boilerplate code that most if not all drivers have to do | |
2560 | * and so they simplify the driver code. | |
2561 | */ | |
2562 | ||
2563 | /* The queue is busy if there is a owner and you are not that owner. */ | |
2564 | static inline bool vb2_queue_is_busy(struct video_device *vdev, struct file *file) | |
2565 | { | |
2566 | return vdev->queue->owner && vdev->queue->owner != file->private_data; | |
2567 | } | |
2568 | ||
2569 | /* vb2 ioctl helpers */ | |
2570 | ||
2571 | int vb2_ioctl_reqbufs(struct file *file, void *priv, | |
2572 | struct v4l2_requestbuffers *p) | |
2573 | { | |
2574 | struct video_device *vdev = video_devdata(file); | |
2575 | int res = __verify_memory_type(vdev->queue, p->memory, p->type); | |
2576 | ||
2577 | if (res) | |
2578 | return res; | |
2579 | if (vb2_queue_is_busy(vdev, file)) | |
2580 | return -EBUSY; | |
2581 | res = __reqbufs(vdev->queue, p); | |
2582 | /* If count == 0, then the owner has released all buffers and he | |
2583 | is no longer owner of the queue. Otherwise we have a new owner. */ | |
2584 | if (res == 0) | |
2585 | vdev->queue->owner = p->count ? file->private_data : NULL; | |
2586 | return res; | |
2587 | } | |
2588 | EXPORT_SYMBOL_GPL(vb2_ioctl_reqbufs); | |
2589 | ||
2590 | int vb2_ioctl_create_bufs(struct file *file, void *priv, | |
2591 | struct v4l2_create_buffers *p) | |
2592 | { | |
2593 | struct video_device *vdev = video_devdata(file); | |
2594 | int res = __verify_memory_type(vdev->queue, p->memory, p->format.type); | |
2595 | ||
2596 | p->index = vdev->queue->num_buffers; | |
2597 | /* If count == 0, then just check if memory and type are valid. | |
2598 | Any -EBUSY result from __verify_memory_type can be mapped to 0. */ | |
2599 | if (p->count == 0) | |
2600 | return res != -EBUSY ? res : 0; | |
2601 | if (res) | |
2602 | return res; | |
2603 | if (vb2_queue_is_busy(vdev, file)) | |
2604 | return -EBUSY; | |
2605 | res = __create_bufs(vdev->queue, p); | |
2606 | if (res == 0) | |
2607 | vdev->queue->owner = file->private_data; | |
2608 | return res; | |
2609 | } | |
2610 | EXPORT_SYMBOL_GPL(vb2_ioctl_create_bufs); | |
2611 | ||
2612 | int vb2_ioctl_prepare_buf(struct file *file, void *priv, | |
2613 | struct v4l2_buffer *p) | |
2614 | { | |
2615 | struct video_device *vdev = video_devdata(file); | |
2616 | ||
2617 | if (vb2_queue_is_busy(vdev, file)) | |
2618 | return -EBUSY; | |
2619 | return vb2_prepare_buf(vdev->queue, p); | |
2620 | } | |
2621 | EXPORT_SYMBOL_GPL(vb2_ioctl_prepare_buf); | |
2622 | ||
2623 | int vb2_ioctl_querybuf(struct file *file, void *priv, struct v4l2_buffer *p) | |
2624 | { | |
2625 | struct video_device *vdev = video_devdata(file); | |
2626 | ||
2627 | /* No need to call vb2_queue_is_busy(), anyone can query buffers. */ | |
2628 | return vb2_querybuf(vdev->queue, p); | |
2629 | } | |
2630 | EXPORT_SYMBOL_GPL(vb2_ioctl_querybuf); | |
2631 | ||
2632 | int vb2_ioctl_qbuf(struct file *file, void *priv, struct v4l2_buffer *p) | |
2633 | { | |
2634 | struct video_device *vdev = video_devdata(file); | |
2635 | ||
2636 | if (vb2_queue_is_busy(vdev, file)) | |
2637 | return -EBUSY; | |
2638 | return vb2_qbuf(vdev->queue, p); | |
2639 | } | |
2640 | EXPORT_SYMBOL_GPL(vb2_ioctl_qbuf); | |
2641 | ||
2642 | int vb2_ioctl_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p) | |
2643 | { | |
2644 | struct video_device *vdev = video_devdata(file); | |
2645 | ||
2646 | if (vb2_queue_is_busy(vdev, file)) | |
2647 | return -EBUSY; | |
2648 | return vb2_dqbuf(vdev->queue, p, file->f_flags & O_NONBLOCK); | |
2649 | } | |
2650 | EXPORT_SYMBOL_GPL(vb2_ioctl_dqbuf); | |
2651 | ||
2652 | int vb2_ioctl_streamon(struct file *file, void *priv, enum v4l2_buf_type i) | |
2653 | { | |
2654 | struct video_device *vdev = video_devdata(file); | |
2655 | ||
2656 | if (vb2_queue_is_busy(vdev, file)) | |
2657 | return -EBUSY; | |
2658 | return vb2_streamon(vdev->queue, i); | |
2659 | } | |
2660 | EXPORT_SYMBOL_GPL(vb2_ioctl_streamon); | |
2661 | ||
2662 | int vb2_ioctl_streamoff(struct file *file, void *priv, enum v4l2_buf_type i) | |
2663 | { | |
2664 | struct video_device *vdev = video_devdata(file); | |
2665 | ||
2666 | if (vb2_queue_is_busy(vdev, file)) | |
2667 | return -EBUSY; | |
2668 | return vb2_streamoff(vdev->queue, i); | |
2669 | } | |
2670 | EXPORT_SYMBOL_GPL(vb2_ioctl_streamoff); | |
2671 | ||
83ae7c5a TS |
2672 | int vb2_ioctl_expbuf(struct file *file, void *priv, struct v4l2_exportbuffer *p) |
2673 | { | |
2674 | struct video_device *vdev = video_devdata(file); | |
2675 | ||
2676 | if (vb2_queue_is_busy(vdev, file)) | |
2677 | return -EBUSY; | |
2678 | return vb2_expbuf(vdev->queue, p); | |
2679 | } | |
2680 | EXPORT_SYMBOL_GPL(vb2_ioctl_expbuf); | |
2681 | ||
4c1ffcaa HV |
2682 | /* v4l2_file_operations helpers */ |
2683 | ||
2684 | int vb2_fop_mmap(struct file *file, struct vm_area_struct *vma) | |
2685 | { | |
2686 | struct video_device *vdev = video_devdata(file); | |
8a90f1a6 LP |
2687 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; |
2688 | int err; | |
4c1ffcaa | 2689 | |
8a90f1a6 LP |
2690 | if (lock && mutex_lock_interruptible(lock)) |
2691 | return -ERESTARTSYS; | |
2692 | err = vb2_mmap(vdev->queue, vma); | |
2693 | if (lock) | |
2694 | mutex_unlock(lock); | |
2695 | return err; | |
4c1ffcaa HV |
2696 | } |
2697 | EXPORT_SYMBOL_GPL(vb2_fop_mmap); | |
2698 | ||
1380f575 | 2699 | int _vb2_fop_release(struct file *file, struct mutex *lock) |
4c1ffcaa HV |
2700 | { |
2701 | struct video_device *vdev = video_devdata(file); | |
2702 | ||
2703 | if (file->private_data == vdev->queue->owner) { | |
1380f575 RR |
2704 | if (lock) |
2705 | mutex_lock(lock); | |
4c1ffcaa HV |
2706 | vb2_queue_release(vdev->queue); |
2707 | vdev->queue->owner = NULL; | |
1380f575 RR |
2708 | if (lock) |
2709 | mutex_unlock(lock); | |
4c1ffcaa HV |
2710 | } |
2711 | return v4l2_fh_release(file); | |
2712 | } | |
1380f575 RR |
2713 | EXPORT_SYMBOL_GPL(_vb2_fop_release); |
2714 | ||
2715 | int vb2_fop_release(struct file *file) | |
2716 | { | |
2717 | struct video_device *vdev = video_devdata(file); | |
2718 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; | |
2719 | ||
2720 | return _vb2_fop_release(file, lock); | |
2721 | } | |
4c1ffcaa HV |
2722 | EXPORT_SYMBOL_GPL(vb2_fop_release); |
2723 | ||
819585bc | 2724 | ssize_t vb2_fop_write(struct file *file, const char __user *buf, |
4c1ffcaa HV |
2725 | size_t count, loff_t *ppos) |
2726 | { | |
2727 | struct video_device *vdev = video_devdata(file); | |
2728 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; | |
4c1ffcaa HV |
2729 | int err = -EBUSY; |
2730 | ||
cf533735 | 2731 | if (lock && mutex_lock_interruptible(lock)) |
4c1ffcaa HV |
2732 | return -ERESTARTSYS; |
2733 | if (vb2_queue_is_busy(vdev, file)) | |
2734 | goto exit; | |
2735 | err = vb2_write(vdev->queue, buf, count, ppos, | |
2736 | file->f_flags & O_NONBLOCK); | |
8c82c75c | 2737 | if (vdev->queue->fileio) |
4c1ffcaa HV |
2738 | vdev->queue->owner = file->private_data; |
2739 | exit: | |
cf533735 | 2740 | if (lock) |
4c1ffcaa HV |
2741 | mutex_unlock(lock); |
2742 | return err; | |
2743 | } | |
2744 | EXPORT_SYMBOL_GPL(vb2_fop_write); | |
2745 | ||
2746 | ssize_t vb2_fop_read(struct file *file, char __user *buf, | |
2747 | size_t count, loff_t *ppos) | |
2748 | { | |
2749 | struct video_device *vdev = video_devdata(file); | |
2750 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; | |
4c1ffcaa HV |
2751 | int err = -EBUSY; |
2752 | ||
cf533735 | 2753 | if (lock && mutex_lock_interruptible(lock)) |
4c1ffcaa HV |
2754 | return -ERESTARTSYS; |
2755 | if (vb2_queue_is_busy(vdev, file)) | |
2756 | goto exit; | |
2757 | err = vb2_read(vdev->queue, buf, count, ppos, | |
2758 | file->f_flags & O_NONBLOCK); | |
8c82c75c | 2759 | if (vdev->queue->fileio) |
4c1ffcaa HV |
2760 | vdev->queue->owner = file->private_data; |
2761 | exit: | |
cf533735 | 2762 | if (lock) |
4c1ffcaa HV |
2763 | mutex_unlock(lock); |
2764 | return err; | |
2765 | } | |
2766 | EXPORT_SYMBOL_GPL(vb2_fop_read); | |
2767 | ||
2768 | unsigned int vb2_fop_poll(struct file *file, poll_table *wait) | |
2769 | { | |
2770 | struct video_device *vdev = video_devdata(file); | |
2771 | struct vb2_queue *q = vdev->queue; | |
2772 | struct mutex *lock = q->lock ? q->lock : vdev->lock; | |
2773 | unsigned long req_events = poll_requested_events(wait); | |
2774 | unsigned res; | |
2775 | void *fileio; | |
4c1ffcaa HV |
2776 | bool must_lock = false; |
2777 | ||
2778 | /* Try to be smart: only lock if polling might start fileio, | |
2779 | otherwise locking will only introduce unwanted delays. */ | |
2780 | if (q->num_buffers == 0 && q->fileio == NULL) { | |
2781 | if (!V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_READ) && | |
2782 | (req_events & (POLLIN | POLLRDNORM))) | |
2783 | must_lock = true; | |
2784 | else if (V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_WRITE) && | |
2785 | (req_events & (POLLOUT | POLLWRNORM))) | |
2786 | must_lock = true; | |
2787 | } | |
2788 | ||
2789 | /* If locking is needed, but this helper doesn't know how, then you | |
2790 | shouldn't be using this helper but you should write your own. */ | |
cf533735 | 2791 | WARN_ON(must_lock && !lock); |
4c1ffcaa | 2792 | |
cf533735 | 2793 | if (must_lock && lock && mutex_lock_interruptible(lock)) |
4c1ffcaa HV |
2794 | return POLLERR; |
2795 | ||
2796 | fileio = q->fileio; | |
2797 | ||
2798 | res = vb2_poll(vdev->queue, file, wait); | |
2799 | ||
2800 | /* If fileio was started, then we have a new queue owner. */ | |
2801 | if (must_lock && !fileio && q->fileio) | |
2802 | q->owner = file->private_data; | |
cf533735 | 2803 | if (must_lock && lock) |
4c1ffcaa HV |
2804 | mutex_unlock(lock); |
2805 | return res; | |
2806 | } | |
2807 | EXPORT_SYMBOL_GPL(vb2_fop_poll); | |
2808 | ||
2809 | #ifndef CONFIG_MMU | |
2810 | unsigned long vb2_fop_get_unmapped_area(struct file *file, unsigned long addr, | |
2811 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
2812 | { | |
2813 | struct video_device *vdev = video_devdata(file); | |
8a90f1a6 LP |
2814 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; |
2815 | int ret; | |
4c1ffcaa | 2816 | |
8a90f1a6 LP |
2817 | if (lock && mutex_lock_interruptible(lock)) |
2818 | return -ERESTARTSYS; | |
2819 | ret = vb2_get_unmapped_area(vdev->queue, addr, len, pgoff, flags); | |
2820 | if (lock) | |
2821 | mutex_unlock(lock); | |
2822 | return ret; | |
4c1ffcaa HV |
2823 | } |
2824 | EXPORT_SYMBOL_GPL(vb2_fop_get_unmapped_area); | |
2825 | #endif | |
2826 | ||
2827 | /* vb2_ops helpers. Only use if vq->lock is non-NULL. */ | |
2828 | ||
2829 | void vb2_ops_wait_prepare(struct vb2_queue *vq) | |
2830 | { | |
2831 | mutex_unlock(vq->lock); | |
2832 | } | |
2833 | EXPORT_SYMBOL_GPL(vb2_ops_wait_prepare); | |
2834 | ||
2835 | void vb2_ops_wait_finish(struct vb2_queue *vq) | |
2836 | { | |
2837 | mutex_lock(vq->lock); | |
2838 | } | |
2839 | EXPORT_SYMBOL_GPL(vb2_ops_wait_finish); | |
2840 | ||
e23ccc0a | 2841 | MODULE_DESCRIPTION("Driver helper framework for Video for Linux 2"); |
95072084 | 2842 | MODULE_AUTHOR("Pawel Osciak <pawel@osciak.com>, Marek Szyprowski"); |
e23ccc0a | 2843 | MODULE_LICENSE("GPL"); |