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 | * | |
3415a89f HV |
9 | * The vb2_thread implementation was based on code from videobuf-dvb.c: |
10 | * (c) 2004 Gerd Knorr <kraxel@bytesex.org> [SUSE Labs] | |
11 | * | |
e23ccc0a PO |
12 | * This program is free software; you can redistribute it and/or modify |
13 | * it under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation. | |
15 | */ | |
16 | ||
17 | #include <linux/err.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/mm.h> | |
21 | #include <linux/poll.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/sched.h> | |
3415a89f HV |
24 | #include <linux/freezer.h> |
25 | #include <linux/kthread.h> | |
e23ccc0a | 26 | |
95213ceb HV |
27 | #include <media/v4l2-dev.h> |
28 | #include <media/v4l2-fh.h> | |
29 | #include <media/v4l2-event.h> | |
ebd7c505 | 30 | #include <media/v4l2-common.h> |
e23ccc0a PO |
31 | #include <media/videobuf2-core.h> |
32 | ||
33 | static int debug; | |
34 | module_param(debug, int, 0644); | |
35 | ||
fd4354cf HV |
36 | #define dprintk(level, fmt, arg...) \ |
37 | do { \ | |
38 | if (debug >= level) \ | |
0821344d | 39 | pr_info("vb2: %s: " fmt, __func__, ## arg); \ |
e23ccc0a PO |
40 | } while (0) |
41 | ||
b5b4541e HV |
42 | #ifdef CONFIG_VIDEO_ADV_DEBUG |
43 | ||
44 | /* | |
a1d36d8c HV |
45 | * If advanced debugging is on, then count how often each op is called |
46 | * successfully, which can either be per-buffer or per-queue. | |
b5b4541e | 47 | * |
a1d36d8c | 48 | * This makes it easy to check that the 'init' and 'cleanup' |
b5b4541e HV |
49 | * (and variations thereof) stay balanced. |
50 | */ | |
51 | ||
a1d36d8c HV |
52 | #define log_memop(vb, op) \ |
53 | dprintk(2, "call_memop(%p, %d, %s)%s\n", \ | |
54 | (vb)->vb2_queue, (vb)->v4l2_buf.index, #op, \ | |
55 | (vb)->vb2_queue->mem_ops->op ? "" : " (nop)") | |
56 | ||
b5b4541e HV |
57 | #define call_memop(vb, op, args...) \ |
58 | ({ \ | |
59 | struct vb2_queue *_q = (vb)->vb2_queue; \ | |
a1d36d8c HV |
60 | int err; \ |
61 | \ | |
62 | log_memop(vb, op); \ | |
63 | err = _q->mem_ops->op ? _q->mem_ops->op(args) : 0; \ | |
64 | if (!err) \ | |
65 | (vb)->cnt_mem_ ## op++; \ | |
66 | err; \ | |
67 | }) | |
68 | ||
69 | #define call_ptr_memop(vb, op, args...) \ | |
70 | ({ \ | |
71 | struct vb2_queue *_q = (vb)->vb2_queue; \ | |
72 | void *ptr; \ | |
73 | \ | |
74 | log_memop(vb, op); \ | |
75 | ptr = _q->mem_ops->op ? _q->mem_ops->op(args) : NULL; \ | |
76 | if (!IS_ERR_OR_NULL(ptr)) \ | |
77 | (vb)->cnt_mem_ ## op++; \ | |
78 | ptr; \ | |
79 | }) | |
80 | ||
81 | #define call_void_memop(vb, op, args...) \ | |
82 | ({ \ | |
83 | struct vb2_queue *_q = (vb)->vb2_queue; \ | |
84 | \ | |
85 | log_memop(vb, op); \ | |
86 | if (_q->mem_ops->op) \ | |
87 | _q->mem_ops->op(args); \ | |
b5b4541e | 88 | (vb)->cnt_mem_ ## op++; \ |
b5b4541e | 89 | }) |
a1d36d8c HV |
90 | |
91 | #define log_qop(q, op) \ | |
92 | dprintk(2, "call_qop(%p, %s)%s\n", q, #op, \ | |
93 | (q)->ops->op ? "" : " (nop)") | |
b5b4541e HV |
94 | |
95 | #define call_qop(q, op, args...) \ | |
96 | ({ \ | |
a1d36d8c HV |
97 | int err; \ |
98 | \ | |
99 | log_qop(q, op); \ | |
100 | err = (q)->ops->op ? (q)->ops->op(args) : 0; \ | |
101 | if (!err) \ | |
102 | (q)->cnt_ ## op++; \ | |
103 | err; \ | |
104 | }) | |
105 | ||
106 | #define call_void_qop(q, op, args...) \ | |
107 | ({ \ | |
108 | log_qop(q, op); \ | |
109 | if ((q)->ops->op) \ | |
110 | (q)->ops->op(args); \ | |
b5b4541e | 111 | (q)->cnt_ ## op++; \ |
b5b4541e | 112 | }) |
a1d36d8c HV |
113 | |
114 | #define log_vb_qop(vb, op, args...) \ | |
115 | dprintk(2, "call_vb_qop(%p, %d, %s)%s\n", \ | |
116 | (vb)->vb2_queue, (vb)->v4l2_buf.index, #op, \ | |
117 | (vb)->vb2_queue->ops->op ? "" : " (nop)") | |
b5b4541e HV |
118 | |
119 | #define call_vb_qop(vb, op, args...) \ | |
120 | ({ \ | |
a1d36d8c HV |
121 | int err; \ |
122 | \ | |
123 | log_vb_qop(vb, op); \ | |
124 | err = (vb)->vb2_queue->ops->op ? \ | |
125 | (vb)->vb2_queue->ops->op(args) : 0; \ | |
126 | if (!err) \ | |
127 | (vb)->cnt_ ## op++; \ | |
128 | err; \ | |
129 | }) | |
130 | ||
131 | #define call_void_vb_qop(vb, op, args...) \ | |
132 | ({ \ | |
133 | log_vb_qop(vb, op); \ | |
134 | if ((vb)->vb2_queue->ops->op) \ | |
135 | (vb)->vb2_queue->ops->op(args); \ | |
b5b4541e | 136 | (vb)->cnt_ ## op++; \ |
b5b4541e | 137 | }) |
b5b4541e HV |
138 | |
139 | #else | |
140 | ||
141 | #define call_memop(vb, op, args...) \ | |
a1d36d8c HV |
142 | ((vb)->vb2_queue->mem_ops->op ? \ |
143 | (vb)->vb2_queue->mem_ops->op(args) : 0) | |
144 | ||
145 | #define call_ptr_memop(vb, op, args...) \ | |
146 | ((vb)->vb2_queue->mem_ops->op ? \ | |
147 | (vb)->vb2_queue->mem_ops->op(args) : NULL) | |
148 | ||
149 | #define call_void_memop(vb, op, args...) \ | |
150 | do { \ | |
151 | if ((vb)->vb2_queue->mem_ops->op) \ | |
152 | (vb)->vb2_queue->mem_ops->op(args); \ | |
153 | } while (0) | |
e23ccc0a PO |
154 | |
155 | #define call_qop(q, op, args...) \ | |
b5b4541e | 156 | ((q)->ops->op ? (q)->ops->op(args) : 0) |
a1d36d8c HV |
157 | |
158 | #define call_void_qop(q, op, args...) \ | |
159 | do { \ | |
160 | if ((q)->ops->op) \ | |
161 | (q)->ops->op(args); \ | |
162 | } while (0) | |
b5b4541e HV |
163 | |
164 | #define call_vb_qop(vb, op, args...) \ | |
165 | ((vb)->vb2_queue->ops->op ? (vb)->vb2_queue->ops->op(args) : 0) | |
a1d36d8c HV |
166 | |
167 | #define call_void_vb_qop(vb, op, args...) \ | |
168 | do { \ | |
169 | if ((vb)->vb2_queue->ops->op) \ | |
170 | (vb)->vb2_queue->ops->op(args); \ | |
171 | } while (0) | |
b5b4541e HV |
172 | |
173 | #endif | |
e23ccc0a | 174 | |
f1343281 | 175 | /* Flags that are set by the vb2 core */ |
1b18e7a0 | 176 | #define V4L2_BUFFER_MASK_FLAGS (V4L2_BUF_FLAG_MAPPED | V4L2_BUF_FLAG_QUEUED | \ |
2d86401c | 177 | V4L2_BUF_FLAG_DONE | V4L2_BUF_FLAG_ERROR | \ |
1b18e7a0 SA |
178 | V4L2_BUF_FLAG_PREPARED | \ |
179 | V4L2_BUF_FLAG_TIMESTAMP_MASK) | |
f1343281 HV |
180 | /* Output buffer flags that should be passed on to the driver */ |
181 | #define V4L2_BUFFER_OUT_FLAGS (V4L2_BUF_FLAG_PFRAME | V4L2_BUF_FLAG_BFRAME | \ | |
182 | V4L2_BUF_FLAG_KEYFRAME | V4L2_BUF_FLAG_TIMECODE) | |
ea42c8ec | 183 | |
fb64dca8 HV |
184 | static void __vb2_queue_cancel(struct vb2_queue *q); |
185 | ||
e23ccc0a PO |
186 | /** |
187 | * __vb2_buf_mem_alloc() - allocate video memory for the given buffer | |
188 | */ | |
c1426bc7 | 189 | static int __vb2_buf_mem_alloc(struct vb2_buffer *vb) |
e23ccc0a PO |
190 | { |
191 | struct vb2_queue *q = vb->vb2_queue; | |
d935c57e HV |
192 | enum dma_data_direction dma_dir = |
193 | V4L2_TYPE_IS_OUTPUT(q->type) ? DMA_TO_DEVICE : DMA_FROM_DEVICE; | |
e23ccc0a PO |
194 | void *mem_priv; |
195 | int plane; | |
196 | ||
7f841459 MCC |
197 | /* |
198 | * Allocate memory for all planes in this buffer | |
199 | * NOTE: mmapped areas should be page aligned | |
200 | */ | |
e23ccc0a | 201 | for (plane = 0; plane < vb->num_planes; ++plane) { |
7f841459 MCC |
202 | unsigned long size = PAGE_ALIGN(q->plane_sizes[plane]); |
203 | ||
a1d36d8c | 204 | mem_priv = call_ptr_memop(vb, alloc, q->alloc_ctx[plane], |
d935c57e | 205 | size, dma_dir, q->gfp_flags); |
62a79436 | 206 | if (IS_ERR_OR_NULL(mem_priv)) |
e23ccc0a PO |
207 | goto free; |
208 | ||
209 | /* Associate allocator private data with this plane */ | |
210 | vb->planes[plane].mem_priv = mem_priv; | |
c1426bc7 | 211 | vb->v4l2_planes[plane].length = q->plane_sizes[plane]; |
e23ccc0a PO |
212 | } |
213 | ||
214 | return 0; | |
215 | free: | |
216 | /* Free already allocated memory if one of the allocations failed */ | |
a00d0266 | 217 | for (; plane > 0; --plane) { |
a1d36d8c | 218 | call_void_memop(vb, put, vb->planes[plane - 1].mem_priv); |
a00d0266 MS |
219 | vb->planes[plane - 1].mem_priv = NULL; |
220 | } | |
e23ccc0a PO |
221 | |
222 | return -ENOMEM; | |
223 | } | |
224 | ||
225 | /** | |
226 | * __vb2_buf_mem_free() - free memory of the given buffer | |
227 | */ | |
228 | static void __vb2_buf_mem_free(struct vb2_buffer *vb) | |
229 | { | |
e23ccc0a PO |
230 | unsigned int plane; |
231 | ||
232 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
a1d36d8c | 233 | call_void_memop(vb, put, vb->planes[plane].mem_priv); |
e23ccc0a | 234 | vb->planes[plane].mem_priv = NULL; |
3050040b | 235 | dprintk(3, "freed plane %d of buffer %d\n", plane, |
a00d0266 | 236 | vb->v4l2_buf.index); |
e23ccc0a PO |
237 | } |
238 | } | |
239 | ||
240 | /** | |
241 | * __vb2_buf_userptr_put() - release userspace memory associated with | |
242 | * a USERPTR buffer | |
243 | */ | |
244 | static void __vb2_buf_userptr_put(struct vb2_buffer *vb) | |
245 | { | |
e23ccc0a PO |
246 | unsigned int plane; |
247 | ||
248 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
a00d0266 | 249 | if (vb->planes[plane].mem_priv) |
a1d36d8c | 250 | call_void_memop(vb, put_userptr, vb->planes[plane].mem_priv); |
a00d0266 | 251 | vb->planes[plane].mem_priv = NULL; |
e23ccc0a PO |
252 | } |
253 | } | |
254 | ||
c5384048 SS |
255 | /** |
256 | * __vb2_plane_dmabuf_put() - release memory associated with | |
257 | * a DMABUF shared plane | |
258 | */ | |
b5b4541e | 259 | static void __vb2_plane_dmabuf_put(struct vb2_buffer *vb, struct vb2_plane *p) |
c5384048 SS |
260 | { |
261 | if (!p->mem_priv) | |
262 | return; | |
263 | ||
264 | if (p->dbuf_mapped) | |
a1d36d8c | 265 | call_void_memop(vb, unmap_dmabuf, p->mem_priv); |
c5384048 | 266 | |
a1d36d8c | 267 | call_void_memop(vb, detach_dmabuf, p->mem_priv); |
c5384048 SS |
268 | dma_buf_put(p->dbuf); |
269 | memset(p, 0, sizeof(*p)); | |
270 | } | |
271 | ||
272 | /** | |
273 | * __vb2_buf_dmabuf_put() - release memory associated with | |
274 | * a DMABUF shared buffer | |
275 | */ | |
276 | static void __vb2_buf_dmabuf_put(struct vb2_buffer *vb) | |
277 | { | |
c5384048 SS |
278 | unsigned int plane; |
279 | ||
280 | for (plane = 0; plane < vb->num_planes; ++plane) | |
b5b4541e | 281 | __vb2_plane_dmabuf_put(vb, &vb->planes[plane]); |
c5384048 SS |
282 | } |
283 | ||
a5e3d743 HV |
284 | /** |
285 | * __setup_lengths() - setup initial lengths for every plane in | |
286 | * every buffer on the queue | |
287 | */ | |
288 | static void __setup_lengths(struct vb2_queue *q, unsigned int n) | |
289 | { | |
290 | unsigned int buffer, plane; | |
291 | struct vb2_buffer *vb; | |
292 | ||
293 | for (buffer = q->num_buffers; buffer < q->num_buffers + n; ++buffer) { | |
294 | vb = q->bufs[buffer]; | |
295 | if (!vb) | |
296 | continue; | |
297 | ||
298 | for (plane = 0; plane < vb->num_planes; ++plane) | |
299 | vb->v4l2_planes[plane].length = q->plane_sizes[plane]; | |
300 | } | |
301 | } | |
302 | ||
e23ccc0a PO |
303 | /** |
304 | * __setup_offsets() - setup unique offsets ("cookies") for every plane in | |
305 | * every buffer on the queue | |
306 | */ | |
2d86401c | 307 | static void __setup_offsets(struct vb2_queue *q, unsigned int n) |
e23ccc0a PO |
308 | { |
309 | unsigned int buffer, plane; | |
310 | struct vb2_buffer *vb; | |
2d86401c | 311 | unsigned long off; |
e23ccc0a | 312 | |
2d86401c GL |
313 | if (q->num_buffers) { |
314 | struct v4l2_plane *p; | |
315 | vb = q->bufs[q->num_buffers - 1]; | |
316 | p = &vb->v4l2_planes[vb->num_planes - 1]; | |
317 | off = PAGE_ALIGN(p->m.mem_offset + p->length); | |
318 | } else { | |
319 | off = 0; | |
320 | } | |
321 | ||
322 | for (buffer = q->num_buffers; buffer < q->num_buffers + n; ++buffer) { | |
e23ccc0a PO |
323 | vb = q->bufs[buffer]; |
324 | if (!vb) | |
325 | continue; | |
326 | ||
327 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
328 | vb->v4l2_planes[plane].m.mem_offset = off; | |
329 | ||
3050040b | 330 | dprintk(3, "buffer %d, plane %d offset 0x%08lx\n", |
e23ccc0a PO |
331 | buffer, plane, off); |
332 | ||
333 | off += vb->v4l2_planes[plane].length; | |
334 | off = PAGE_ALIGN(off); | |
335 | } | |
336 | } | |
337 | } | |
338 | ||
339 | /** | |
340 | * __vb2_queue_alloc() - allocate videobuf buffer structures and (for MMAP type) | |
341 | * video buffer memory for all buffers/planes on the queue and initializes the | |
342 | * queue | |
343 | * | |
344 | * Returns the number of buffers successfully allocated. | |
345 | */ | |
346 | static int __vb2_queue_alloc(struct vb2_queue *q, enum v4l2_memory memory, | |
c1426bc7 | 347 | unsigned int num_buffers, unsigned int num_planes) |
e23ccc0a PO |
348 | { |
349 | unsigned int buffer; | |
350 | struct vb2_buffer *vb; | |
351 | int ret; | |
352 | ||
353 | for (buffer = 0; buffer < num_buffers; ++buffer) { | |
354 | /* Allocate videobuf buffer structures */ | |
355 | vb = kzalloc(q->buf_struct_size, GFP_KERNEL); | |
356 | if (!vb) { | |
3050040b | 357 | dprintk(1, "memory alloc for buffer struct failed\n"); |
e23ccc0a PO |
358 | break; |
359 | } | |
360 | ||
361 | /* Length stores number of planes for multiplanar buffers */ | |
362 | if (V4L2_TYPE_IS_MULTIPLANAR(q->type)) | |
363 | vb->v4l2_buf.length = num_planes; | |
364 | ||
365 | vb->state = VB2_BUF_STATE_DEQUEUED; | |
366 | vb->vb2_queue = q; | |
367 | vb->num_planes = num_planes; | |
2d86401c | 368 | vb->v4l2_buf.index = q->num_buffers + buffer; |
e23ccc0a PO |
369 | vb->v4l2_buf.type = q->type; |
370 | vb->v4l2_buf.memory = memory; | |
371 | ||
372 | /* Allocate video buffer memory for the MMAP type */ | |
373 | if (memory == V4L2_MEMORY_MMAP) { | |
c1426bc7 | 374 | ret = __vb2_buf_mem_alloc(vb); |
e23ccc0a | 375 | if (ret) { |
3050040b | 376 | dprintk(1, "failed allocating memory for " |
e23ccc0a PO |
377 | "buffer %d\n", buffer); |
378 | kfree(vb); | |
379 | break; | |
380 | } | |
381 | /* | |
382 | * Call the driver-provided buffer initialization | |
383 | * callback, if given. An error in initialization | |
384 | * results in queue setup failure. | |
385 | */ | |
b5b4541e | 386 | ret = call_vb_qop(vb, buf_init, vb); |
e23ccc0a | 387 | if (ret) { |
3050040b | 388 | dprintk(1, "buffer %d %p initialization" |
e23ccc0a PO |
389 | " failed\n", buffer, vb); |
390 | __vb2_buf_mem_free(vb); | |
391 | kfree(vb); | |
392 | break; | |
393 | } | |
394 | } | |
395 | ||
2d86401c | 396 | q->bufs[q->num_buffers + buffer] = vb; |
e23ccc0a PO |
397 | } |
398 | ||
a5e3d743 | 399 | __setup_lengths(q, buffer); |
dc77523c PZ |
400 | if (memory == V4L2_MEMORY_MMAP) |
401 | __setup_offsets(q, buffer); | |
e23ccc0a | 402 | |
3050040b | 403 | dprintk(1, "allocated %d buffers, %d plane(s) each\n", |
2d86401c | 404 | buffer, num_planes); |
e23ccc0a PO |
405 | |
406 | return buffer; | |
407 | } | |
408 | ||
409 | /** | |
410 | * __vb2_free_mem() - release all video buffer memory for a given queue | |
411 | */ | |
2d86401c | 412 | static void __vb2_free_mem(struct vb2_queue *q, unsigned int buffers) |
e23ccc0a PO |
413 | { |
414 | unsigned int buffer; | |
415 | struct vb2_buffer *vb; | |
416 | ||
2d86401c GL |
417 | for (buffer = q->num_buffers - buffers; buffer < q->num_buffers; |
418 | ++buffer) { | |
e23ccc0a PO |
419 | vb = q->bufs[buffer]; |
420 | if (!vb) | |
421 | continue; | |
422 | ||
423 | /* Free MMAP buffers or release USERPTR buffers */ | |
424 | if (q->memory == V4L2_MEMORY_MMAP) | |
425 | __vb2_buf_mem_free(vb); | |
c5384048 SS |
426 | else if (q->memory == V4L2_MEMORY_DMABUF) |
427 | __vb2_buf_dmabuf_put(vb); | |
e23ccc0a PO |
428 | else |
429 | __vb2_buf_userptr_put(vb); | |
430 | } | |
431 | } | |
432 | ||
433 | /** | |
2d86401c GL |
434 | * __vb2_queue_free() - free buffers at the end of the queue - video memory and |
435 | * related information, if no buffers are left return the queue to an | |
436 | * uninitialized state. Might be called even if the queue has already been freed. | |
e23ccc0a | 437 | */ |
63faabfd | 438 | static int __vb2_queue_free(struct vb2_queue *q, unsigned int buffers) |
e23ccc0a PO |
439 | { |
440 | unsigned int buffer; | |
441 | ||
63faabfd HV |
442 | /* |
443 | * Sanity check: when preparing a buffer the queue lock is released for | |
444 | * a short while (see __buf_prepare for the details), which would allow | |
445 | * a race with a reqbufs which can call this function. Removing the | |
446 | * buffers from underneath __buf_prepare is obviously a bad idea, so we | |
447 | * check if any of the buffers is in the state PREPARING, and if so we | |
448 | * just return -EAGAIN. | |
449 | */ | |
450 | for (buffer = q->num_buffers - buffers; buffer < q->num_buffers; | |
451 | ++buffer) { | |
452 | if (q->bufs[buffer] == NULL) | |
453 | continue; | |
454 | if (q->bufs[buffer]->state == VB2_BUF_STATE_PREPARING) { | |
fd4354cf | 455 | dprintk(1, "preparing buffers, cannot free\n"); |
63faabfd HV |
456 | return -EAGAIN; |
457 | } | |
458 | } | |
459 | ||
e23ccc0a | 460 | /* Call driver-provided cleanup function for each buffer, if provided */ |
b5b4541e HV |
461 | for (buffer = q->num_buffers - buffers; buffer < q->num_buffers; |
462 | ++buffer) { | |
256f3162 HV |
463 | struct vb2_buffer *vb = q->bufs[buffer]; |
464 | ||
465 | if (vb && vb->planes[0].mem_priv) | |
a1d36d8c | 466 | call_void_vb_qop(vb, buf_cleanup, vb); |
e23ccc0a PO |
467 | } |
468 | ||
469 | /* Release video buffer memory */ | |
2d86401c | 470 | __vb2_free_mem(q, buffers); |
e23ccc0a | 471 | |
b5b4541e HV |
472 | #ifdef CONFIG_VIDEO_ADV_DEBUG |
473 | /* | |
474 | * Check that all the calls were balances during the life-time of this | |
475 | * queue. If not (or if the debug level is 1 or up), then dump the | |
476 | * counters to the kernel log. | |
477 | */ | |
478 | if (q->num_buffers) { | |
479 | bool unbalanced = q->cnt_start_streaming != q->cnt_stop_streaming || | |
480 | q->cnt_wait_prepare != q->cnt_wait_finish; | |
481 | ||
482 | if (unbalanced || debug) { | |
483 | pr_info("vb2: counters for queue %p:%s\n", q, | |
484 | unbalanced ? " UNBALANCED!" : ""); | |
485 | pr_info("vb2: setup: %u start_streaming: %u stop_streaming: %u\n", | |
486 | q->cnt_queue_setup, q->cnt_start_streaming, | |
487 | q->cnt_stop_streaming); | |
488 | pr_info("vb2: wait_prepare: %u wait_finish: %u\n", | |
489 | q->cnt_wait_prepare, q->cnt_wait_finish); | |
490 | } | |
491 | q->cnt_queue_setup = 0; | |
492 | q->cnt_wait_prepare = 0; | |
493 | q->cnt_wait_finish = 0; | |
494 | q->cnt_start_streaming = 0; | |
495 | q->cnt_stop_streaming = 0; | |
496 | } | |
497 | for (buffer = 0; buffer < q->num_buffers; ++buffer) { | |
498 | struct vb2_buffer *vb = q->bufs[buffer]; | |
499 | bool unbalanced = vb->cnt_mem_alloc != vb->cnt_mem_put || | |
500 | vb->cnt_mem_prepare != vb->cnt_mem_finish || | |
501 | vb->cnt_mem_get_userptr != vb->cnt_mem_put_userptr || | |
502 | vb->cnt_mem_attach_dmabuf != vb->cnt_mem_detach_dmabuf || | |
503 | vb->cnt_mem_map_dmabuf != vb->cnt_mem_unmap_dmabuf || | |
504 | vb->cnt_buf_queue != vb->cnt_buf_done || | |
505 | vb->cnt_buf_prepare != vb->cnt_buf_finish || | |
506 | vb->cnt_buf_init != vb->cnt_buf_cleanup; | |
507 | ||
508 | if (unbalanced || debug) { | |
509 | pr_info("vb2: counters for queue %p, buffer %d:%s\n", | |
510 | q, buffer, unbalanced ? " UNBALANCED!" : ""); | |
511 | pr_info("vb2: buf_init: %u buf_cleanup: %u buf_prepare: %u buf_finish: %u\n", | |
512 | vb->cnt_buf_init, vb->cnt_buf_cleanup, | |
513 | vb->cnt_buf_prepare, vb->cnt_buf_finish); | |
514 | pr_info("vb2: buf_queue: %u buf_done: %u\n", | |
515 | vb->cnt_buf_queue, vb->cnt_buf_done); | |
516 | pr_info("vb2: alloc: %u put: %u prepare: %u finish: %u mmap: %u\n", | |
517 | vb->cnt_mem_alloc, vb->cnt_mem_put, | |
518 | vb->cnt_mem_prepare, vb->cnt_mem_finish, | |
519 | vb->cnt_mem_mmap); | |
520 | pr_info("vb2: get_userptr: %u put_userptr: %u\n", | |
521 | vb->cnt_mem_get_userptr, vb->cnt_mem_put_userptr); | |
522 | pr_info("vb2: attach_dmabuf: %u detach_dmabuf: %u map_dmabuf: %u unmap_dmabuf: %u\n", | |
523 | vb->cnt_mem_attach_dmabuf, vb->cnt_mem_detach_dmabuf, | |
524 | vb->cnt_mem_map_dmabuf, vb->cnt_mem_unmap_dmabuf); | |
525 | pr_info("vb2: get_dmabuf: %u num_users: %u vaddr: %u cookie: %u\n", | |
526 | vb->cnt_mem_get_dmabuf, | |
527 | vb->cnt_mem_num_users, | |
528 | vb->cnt_mem_vaddr, | |
529 | vb->cnt_mem_cookie); | |
530 | } | |
531 | } | |
532 | #endif | |
533 | ||
e23ccc0a | 534 | /* Free videobuf buffers */ |
2d86401c GL |
535 | for (buffer = q->num_buffers - buffers; buffer < q->num_buffers; |
536 | ++buffer) { | |
e23ccc0a PO |
537 | kfree(q->bufs[buffer]); |
538 | q->bufs[buffer] = NULL; | |
539 | } | |
540 | ||
2d86401c | 541 | q->num_buffers -= buffers; |
a7afcacc | 542 | if (!q->num_buffers) { |
2d86401c | 543 | q->memory = 0; |
a7afcacc HV |
544 | INIT_LIST_HEAD(&q->queued_list); |
545 | } | |
63faabfd | 546 | return 0; |
e23ccc0a PO |
547 | } |
548 | ||
549 | /** | |
550 | * __verify_planes_array() - verify that the planes array passed in struct | |
551 | * v4l2_buffer from userspace can be safely used | |
552 | */ | |
2d86401c | 553 | static int __verify_planes_array(struct vb2_buffer *vb, const struct v4l2_buffer *b) |
e23ccc0a | 554 | { |
32a77260 HV |
555 | if (!V4L2_TYPE_IS_MULTIPLANAR(b->type)) |
556 | return 0; | |
557 | ||
e23ccc0a PO |
558 | /* Is memory for copying plane information present? */ |
559 | if (NULL == b->m.planes) { | |
3050040b | 560 | dprintk(1, "multi-planar buffer passed but " |
e23ccc0a PO |
561 | "planes array not provided\n"); |
562 | return -EINVAL; | |
563 | } | |
564 | ||
565 | if (b->length < vb->num_planes || b->length > VIDEO_MAX_PLANES) { | |
3050040b | 566 | dprintk(1, "incorrect planes array length, " |
e23ccc0a PO |
567 | "expected %d, got %d\n", vb->num_planes, b->length); |
568 | return -EINVAL; | |
569 | } | |
570 | ||
571 | return 0; | |
572 | } | |
573 | ||
8023ed09 LP |
574 | /** |
575 | * __verify_length() - Verify that the bytesused value for each plane fits in | |
576 | * the plane length and that the data offset doesn't exceed the bytesused value. | |
577 | */ | |
578 | static int __verify_length(struct vb2_buffer *vb, const struct v4l2_buffer *b) | |
579 | { | |
580 | unsigned int length; | |
8a75ffb8 | 581 | unsigned int bytesused; |
8023ed09 LP |
582 | unsigned int plane; |
583 | ||
584 | if (!V4L2_TYPE_IS_OUTPUT(b->type)) | |
585 | return 0; | |
586 | ||
587 | if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) { | |
588 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
8a75ffb8 HV |
589 | length = (b->memory == V4L2_MEMORY_USERPTR || |
590 | b->memory == V4L2_MEMORY_DMABUF) | |
8023ed09 LP |
591 | ? b->m.planes[plane].length |
592 | : vb->v4l2_planes[plane].length; | |
8a75ffb8 HV |
593 | bytesused = b->m.planes[plane].bytesused |
594 | ? b->m.planes[plane].bytesused : length; | |
8023ed09 LP |
595 | |
596 | if (b->m.planes[plane].bytesused > length) | |
597 | return -EINVAL; | |
3c5c23c5 SN |
598 | |
599 | if (b->m.planes[plane].data_offset > 0 && | |
8a75ffb8 | 600 | b->m.planes[plane].data_offset >= bytesused) |
8023ed09 LP |
601 | return -EINVAL; |
602 | } | |
603 | } else { | |
604 | length = (b->memory == V4L2_MEMORY_USERPTR) | |
605 | ? b->length : vb->v4l2_planes[0].length; | |
8a75ffb8 | 606 | bytesused = b->bytesused ? b->bytesused : length; |
8023ed09 LP |
607 | |
608 | if (b->bytesused > length) | |
609 | return -EINVAL; | |
610 | } | |
611 | ||
612 | return 0; | |
613 | } | |
614 | ||
25a27d91 MS |
615 | /** |
616 | * __buffer_in_use() - return true if the buffer is in use and | |
617 | * the queue cannot be freed (by the means of REQBUFS(0)) call | |
618 | */ | |
619 | static bool __buffer_in_use(struct vb2_queue *q, struct vb2_buffer *vb) | |
620 | { | |
621 | unsigned int plane; | |
622 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
2c2dd6ac | 623 | void *mem_priv = vb->planes[plane].mem_priv; |
25a27d91 MS |
624 | /* |
625 | * If num_users() has not been provided, call_memop | |
626 | * will return 0, apparently nobody cares about this | |
627 | * case anyway. If num_users() returns more than 1, | |
628 | * we are not the only user of the plane's memory. | |
629 | */ | |
b5b4541e | 630 | if (mem_priv && call_memop(vb, num_users, mem_priv) > 1) |
25a27d91 MS |
631 | return true; |
632 | } | |
633 | return false; | |
634 | } | |
635 | ||
636 | /** | |
637 | * __buffers_in_use() - return true if any buffers on the queue are in use and | |
638 | * the queue cannot be freed (by the means of REQBUFS(0)) call | |
639 | */ | |
640 | static bool __buffers_in_use(struct vb2_queue *q) | |
641 | { | |
642 | unsigned int buffer; | |
643 | for (buffer = 0; buffer < q->num_buffers; ++buffer) { | |
644 | if (__buffer_in_use(q, q->bufs[buffer])) | |
645 | return true; | |
646 | } | |
647 | return false; | |
648 | } | |
649 | ||
e23ccc0a PO |
650 | /** |
651 | * __fill_v4l2_buffer() - fill in a struct v4l2_buffer with information to be | |
652 | * returned to userspace | |
653 | */ | |
32a77260 | 654 | static void __fill_v4l2_buffer(struct vb2_buffer *vb, struct v4l2_buffer *b) |
e23ccc0a PO |
655 | { |
656 | struct vb2_queue *q = vb->vb2_queue; | |
e23ccc0a | 657 | |
2b719d7b | 658 | /* Copy back data such as timestamp, flags, etc. */ |
e23ccc0a | 659 | memcpy(b, &vb->v4l2_buf, offsetof(struct v4l2_buffer, m)); |
2b719d7b | 660 | b->reserved2 = vb->v4l2_buf.reserved2; |
e23ccc0a PO |
661 | b->reserved = vb->v4l2_buf.reserved; |
662 | ||
663 | if (V4L2_TYPE_IS_MULTIPLANAR(q->type)) { | |
e23ccc0a PO |
664 | /* |
665 | * Fill in plane-related data if userspace provided an array | |
32a77260 | 666 | * for it. The caller has already verified memory and size. |
e23ccc0a | 667 | */ |
3c0b6061 | 668 | b->length = vb->num_planes; |
e23ccc0a PO |
669 | memcpy(b->m.planes, vb->v4l2_planes, |
670 | b->length * sizeof(struct v4l2_plane)); | |
671 | } else { | |
672 | /* | |
673 | * We use length and offset in v4l2_planes array even for | |
674 | * single-planar buffers, but userspace does not. | |
675 | */ | |
676 | b->length = vb->v4l2_planes[0].length; | |
677 | b->bytesused = vb->v4l2_planes[0].bytesused; | |
678 | if (q->memory == V4L2_MEMORY_MMAP) | |
679 | b->m.offset = vb->v4l2_planes[0].m.mem_offset; | |
680 | else if (q->memory == V4L2_MEMORY_USERPTR) | |
681 | b->m.userptr = vb->v4l2_planes[0].m.userptr; | |
c5384048 SS |
682 | else if (q->memory == V4L2_MEMORY_DMABUF) |
683 | b->m.fd = vb->v4l2_planes[0].m.fd; | |
e23ccc0a PO |
684 | } |
685 | ||
ea42c8ec MS |
686 | /* |
687 | * Clear any buffer state related flags. | |
688 | */ | |
1b18e7a0 | 689 | b->flags &= ~V4L2_BUFFER_MASK_FLAGS; |
7ce6fd8f SA |
690 | b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK; |
691 | if ((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) != | |
692 | V4L2_BUF_FLAG_TIMESTAMP_COPY) { | |
693 | /* | |
694 | * For non-COPY timestamps, drop timestamp source bits | |
695 | * and obtain the timestamp source from the queue. | |
696 | */ | |
697 | b->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK; | |
698 | b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TSTAMP_SRC_MASK; | |
699 | } | |
e23ccc0a PO |
700 | |
701 | switch (vb->state) { | |
702 | case VB2_BUF_STATE_QUEUED: | |
703 | case VB2_BUF_STATE_ACTIVE: | |
704 | b->flags |= V4L2_BUF_FLAG_QUEUED; | |
705 | break; | |
706 | case VB2_BUF_STATE_ERROR: | |
707 | b->flags |= V4L2_BUF_FLAG_ERROR; | |
708 | /* fall through */ | |
709 | case VB2_BUF_STATE_DONE: | |
710 | b->flags |= V4L2_BUF_FLAG_DONE; | |
711 | break; | |
ebc087d0 | 712 | case VB2_BUF_STATE_PREPARED: |
2d86401c GL |
713 | b->flags |= V4L2_BUF_FLAG_PREPARED; |
714 | break; | |
b18a8ff2 | 715 | case VB2_BUF_STATE_PREPARING: |
2d86401c | 716 | case VB2_BUF_STATE_DEQUEUED: |
e23ccc0a PO |
717 | /* nothing */ |
718 | break; | |
719 | } | |
720 | ||
25a27d91 | 721 | if (__buffer_in_use(q, vb)) |
e23ccc0a | 722 | b->flags |= V4L2_BUF_FLAG_MAPPED; |
e23ccc0a PO |
723 | } |
724 | ||
725 | /** | |
726 | * vb2_querybuf() - query video buffer information | |
727 | * @q: videobuf queue | |
728 | * @b: buffer struct passed from userspace to vidioc_querybuf handler | |
729 | * in driver | |
730 | * | |
731 | * Should be called from vidioc_querybuf ioctl handler in driver. | |
732 | * This function will verify the passed v4l2_buffer structure and fill the | |
733 | * relevant information for the userspace. | |
734 | * | |
735 | * The return values from this function are intended to be directly returned | |
736 | * from vidioc_querybuf handler in driver. | |
737 | */ | |
738 | int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b) | |
739 | { | |
740 | struct vb2_buffer *vb; | |
32a77260 | 741 | int ret; |
e23ccc0a PO |
742 | |
743 | if (b->type != q->type) { | |
fd4354cf | 744 | dprintk(1, "wrong buffer type\n"); |
e23ccc0a PO |
745 | return -EINVAL; |
746 | } | |
747 | ||
748 | if (b->index >= q->num_buffers) { | |
fd4354cf | 749 | dprintk(1, "buffer index out of range\n"); |
e23ccc0a PO |
750 | return -EINVAL; |
751 | } | |
752 | vb = q->bufs[b->index]; | |
32a77260 HV |
753 | ret = __verify_planes_array(vb, b); |
754 | if (!ret) | |
755 | __fill_v4l2_buffer(vb, b); | |
756 | return ret; | |
e23ccc0a PO |
757 | } |
758 | EXPORT_SYMBOL(vb2_querybuf); | |
759 | ||
760 | /** | |
761 | * __verify_userptr_ops() - verify that all memory operations required for | |
762 | * USERPTR queue type have been provided | |
763 | */ | |
764 | static int __verify_userptr_ops(struct vb2_queue *q) | |
765 | { | |
766 | if (!(q->io_modes & VB2_USERPTR) || !q->mem_ops->get_userptr || | |
767 | !q->mem_ops->put_userptr) | |
768 | return -EINVAL; | |
769 | ||
770 | return 0; | |
771 | } | |
772 | ||
773 | /** | |
774 | * __verify_mmap_ops() - verify that all memory operations required for | |
775 | * MMAP queue type have been provided | |
776 | */ | |
777 | static int __verify_mmap_ops(struct vb2_queue *q) | |
778 | { | |
779 | if (!(q->io_modes & VB2_MMAP) || !q->mem_ops->alloc || | |
780 | !q->mem_ops->put || !q->mem_ops->mmap) | |
781 | return -EINVAL; | |
782 | ||
783 | return 0; | |
784 | } | |
785 | ||
c5384048 SS |
786 | /** |
787 | * __verify_dmabuf_ops() - verify that all memory operations required for | |
788 | * DMABUF queue type have been provided | |
789 | */ | |
790 | static int __verify_dmabuf_ops(struct vb2_queue *q) | |
791 | { | |
792 | if (!(q->io_modes & VB2_DMABUF) || !q->mem_ops->attach_dmabuf || | |
793 | !q->mem_ops->detach_dmabuf || !q->mem_ops->map_dmabuf || | |
794 | !q->mem_ops->unmap_dmabuf) | |
795 | return -EINVAL; | |
796 | ||
797 | return 0; | |
798 | } | |
799 | ||
e23ccc0a | 800 | /** |
37d9ed94 HV |
801 | * __verify_memory_type() - Check whether the memory type and buffer type |
802 | * passed to a buffer operation are compatible with the queue. | |
803 | */ | |
804 | static int __verify_memory_type(struct vb2_queue *q, | |
805 | enum v4l2_memory memory, enum v4l2_buf_type type) | |
806 | { | |
c5384048 SS |
807 | if (memory != V4L2_MEMORY_MMAP && memory != V4L2_MEMORY_USERPTR && |
808 | memory != V4L2_MEMORY_DMABUF) { | |
fd4354cf | 809 | dprintk(1, "unsupported memory type\n"); |
37d9ed94 HV |
810 | return -EINVAL; |
811 | } | |
812 | ||
813 | if (type != q->type) { | |
fd4354cf | 814 | dprintk(1, "requested type is incorrect\n"); |
37d9ed94 HV |
815 | return -EINVAL; |
816 | } | |
817 | ||
818 | /* | |
819 | * Make sure all the required memory ops for given memory type | |
820 | * are available. | |
821 | */ | |
822 | if (memory == V4L2_MEMORY_MMAP && __verify_mmap_ops(q)) { | |
fd4354cf | 823 | dprintk(1, "MMAP for current setup unsupported\n"); |
37d9ed94 HV |
824 | return -EINVAL; |
825 | } | |
826 | ||
827 | if (memory == V4L2_MEMORY_USERPTR && __verify_userptr_ops(q)) { | |
fd4354cf | 828 | dprintk(1, "USERPTR for current setup unsupported\n"); |
37d9ed94 HV |
829 | return -EINVAL; |
830 | } | |
831 | ||
c5384048 | 832 | if (memory == V4L2_MEMORY_DMABUF && __verify_dmabuf_ops(q)) { |
fd4354cf | 833 | dprintk(1, "DMABUF for current setup unsupported\n"); |
c5384048 SS |
834 | return -EINVAL; |
835 | } | |
836 | ||
37d9ed94 HV |
837 | /* |
838 | * Place the busy tests at the end: -EBUSY can be ignored when | |
839 | * create_bufs is called with count == 0, but count == 0 should still | |
840 | * do the memory and type validation. | |
841 | */ | |
74753cff | 842 | if (vb2_fileio_is_active(q)) { |
fd4354cf | 843 | dprintk(1, "file io in progress\n"); |
37d9ed94 HV |
844 | return -EBUSY; |
845 | } | |
846 | return 0; | |
847 | } | |
848 | ||
849 | /** | |
850 | * __reqbufs() - Initiate streaming | |
e23ccc0a PO |
851 | * @q: videobuf2 queue |
852 | * @req: struct passed from userspace to vidioc_reqbufs handler in driver | |
853 | * | |
854 | * Should be called from vidioc_reqbufs ioctl handler of a driver. | |
855 | * This function: | |
856 | * 1) verifies streaming parameters passed from the userspace, | |
857 | * 2) sets up the queue, | |
858 | * 3) negotiates number of buffers and planes per buffer with the driver | |
859 | * to be used during streaming, | |
860 | * 4) allocates internal buffer structures (struct vb2_buffer), according to | |
861 | * the agreed parameters, | |
862 | * 5) for MMAP memory type, allocates actual video memory, using the | |
863 | * memory handling/allocation routines provided during queue initialization | |
864 | * | |
865 | * If req->count is 0, all the memory will be freed instead. | |
866 | * If the queue has been allocated previously (by a previous vb2_reqbufs) call | |
867 | * and the queue is not busy, memory will be reallocated. | |
868 | * | |
869 | * The return values from this function are intended to be directly returned | |
870 | * from vidioc_reqbufs handler in driver. | |
871 | */ | |
37d9ed94 | 872 | static int __reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req) |
e23ccc0a | 873 | { |
2d86401c | 874 | unsigned int num_buffers, allocated_buffers, num_planes = 0; |
37d9ed94 | 875 | int ret; |
e23ccc0a PO |
876 | |
877 | if (q->streaming) { | |
fd4354cf | 878 | dprintk(1, "streaming active\n"); |
e23ccc0a PO |
879 | return -EBUSY; |
880 | } | |
881 | ||
29e3fbd8 | 882 | if (req->count == 0 || q->num_buffers != 0 || q->memory != req->memory) { |
e23ccc0a PO |
883 | /* |
884 | * We already have buffers allocated, so first check if they | |
885 | * are not in use and can be freed. | |
886 | */ | |
f035eb4e | 887 | mutex_lock(&q->mmap_lock); |
e23ccc0a | 888 | if (q->memory == V4L2_MEMORY_MMAP && __buffers_in_use(q)) { |
f035eb4e | 889 | mutex_unlock(&q->mmap_lock); |
fd4354cf | 890 | dprintk(1, "memory in use, cannot free\n"); |
e23ccc0a PO |
891 | return -EBUSY; |
892 | } | |
893 | ||
fb64dca8 HV |
894 | /* |
895 | * Call queue_cancel to clean up any buffers in the PREPARED or | |
896 | * QUEUED state which is possible if buffers were prepared or | |
897 | * queued without ever calling STREAMON. | |
898 | */ | |
899 | __vb2_queue_cancel(q); | |
63faabfd | 900 | ret = __vb2_queue_free(q, q->num_buffers); |
f035eb4e | 901 | mutex_unlock(&q->mmap_lock); |
63faabfd HV |
902 | if (ret) |
903 | return ret; | |
29e3fbd8 MS |
904 | |
905 | /* | |
906 | * In case of REQBUFS(0) return immediately without calling | |
907 | * driver's queue_setup() callback and allocating resources. | |
908 | */ | |
909 | if (req->count == 0) | |
910 | return 0; | |
e23ccc0a PO |
911 | } |
912 | ||
913 | /* | |
914 | * Make sure the requested values and current defaults are sane. | |
915 | */ | |
916 | num_buffers = min_t(unsigned int, req->count, VIDEO_MAX_FRAME); | |
4cf743de | 917 | num_buffers = max_t(unsigned int, num_buffers, q->min_buffers_needed); |
c1426bc7 | 918 | memset(q->plane_sizes, 0, sizeof(q->plane_sizes)); |
e23ccc0a | 919 | memset(q->alloc_ctx, 0, sizeof(q->alloc_ctx)); |
13b14095 | 920 | q->memory = req->memory; |
e23ccc0a PO |
921 | |
922 | /* | |
923 | * Ask the driver how many buffers and planes per buffer it requires. | |
924 | * Driver also sets the size and allocator context for each plane. | |
925 | */ | |
fc714e70 | 926 | ret = call_qop(q, queue_setup, q, NULL, &num_buffers, &num_planes, |
c1426bc7 | 927 | q->plane_sizes, q->alloc_ctx); |
a1d36d8c | 928 | if (ret) |
e23ccc0a PO |
929 | return ret; |
930 | ||
931 | /* Finally, allocate buffers and video memory */ | |
a7afcacc HV |
932 | allocated_buffers = __vb2_queue_alloc(q, req->memory, num_buffers, num_planes); |
933 | if (allocated_buffers == 0) { | |
3050040b | 934 | dprintk(1, "memory allocation failed\n"); |
66072d4f | 935 | return -ENOMEM; |
e23ccc0a PO |
936 | } |
937 | ||
b3379c62 HV |
938 | /* |
939 | * There is no point in continuing if we can't allocate the minimum | |
940 | * number of buffers needed by this vb2_queue. | |
941 | */ | |
942 | if (allocated_buffers < q->min_buffers_needed) | |
943 | ret = -ENOMEM; | |
944 | ||
e23ccc0a PO |
945 | /* |
946 | * Check if driver can handle the allocated number of buffers. | |
947 | */ | |
b3379c62 | 948 | if (!ret && allocated_buffers < num_buffers) { |
2d86401c | 949 | num_buffers = allocated_buffers; |
e23ccc0a | 950 | |
fc714e70 GL |
951 | ret = call_qop(q, queue_setup, q, NULL, &num_buffers, |
952 | &num_planes, q->plane_sizes, q->alloc_ctx); | |
e23ccc0a | 953 | |
2d86401c | 954 | if (!ret && allocated_buffers < num_buffers) |
e23ccc0a | 955 | ret = -ENOMEM; |
e23ccc0a PO |
956 | |
957 | /* | |
2d86401c GL |
958 | * Either the driver has accepted a smaller number of buffers, |
959 | * or .queue_setup() returned an error | |
e23ccc0a | 960 | */ |
2d86401c GL |
961 | } |
962 | ||
f035eb4e | 963 | mutex_lock(&q->mmap_lock); |
2d86401c GL |
964 | q->num_buffers = allocated_buffers; |
965 | ||
966 | if (ret < 0) { | |
a7afcacc HV |
967 | /* |
968 | * Note: __vb2_queue_free() will subtract 'allocated_buffers' | |
969 | * from q->num_buffers. | |
970 | */ | |
2d86401c | 971 | __vb2_queue_free(q, allocated_buffers); |
f035eb4e | 972 | mutex_unlock(&q->mmap_lock); |
2d86401c | 973 | return ret; |
e23ccc0a | 974 | } |
f035eb4e | 975 | mutex_unlock(&q->mmap_lock); |
e23ccc0a | 976 | |
e23ccc0a PO |
977 | /* |
978 | * Return the number of successfully allocated buffers | |
979 | * to the userspace. | |
980 | */ | |
2d86401c | 981 | req->count = allocated_buffers; |
58d75f4b | 982 | q->waiting_for_buffers = !V4L2_TYPE_IS_OUTPUT(q->type); |
e23ccc0a PO |
983 | |
984 | return 0; | |
e23ccc0a | 985 | } |
37d9ed94 HV |
986 | |
987 | /** | |
988 | * vb2_reqbufs() - Wrapper for __reqbufs() that also verifies the memory and | |
989 | * type values. | |
990 | * @q: videobuf2 queue | |
991 | * @req: struct passed from userspace to vidioc_reqbufs handler in driver | |
992 | */ | |
993 | int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req) | |
994 | { | |
995 | int ret = __verify_memory_type(q, req->memory, req->type); | |
996 | ||
997 | return ret ? ret : __reqbufs(q, req); | |
998 | } | |
e23ccc0a PO |
999 | EXPORT_SYMBOL_GPL(vb2_reqbufs); |
1000 | ||
2d86401c | 1001 | /** |
37d9ed94 | 1002 | * __create_bufs() - Allocate buffers and any required auxiliary structs |
2d86401c GL |
1003 | * @q: videobuf2 queue |
1004 | * @create: creation parameters, passed from userspace to vidioc_create_bufs | |
1005 | * handler in driver | |
1006 | * | |
1007 | * Should be called from vidioc_create_bufs ioctl handler of a driver. | |
1008 | * This function: | |
1009 | * 1) verifies parameter sanity | |
1010 | * 2) calls the .queue_setup() queue operation | |
1011 | * 3) performs any necessary memory allocations | |
1012 | * | |
1013 | * The return values from this function are intended to be directly returned | |
1014 | * from vidioc_create_bufs handler in driver. | |
1015 | */ | |
37d9ed94 | 1016 | static int __create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) |
2d86401c GL |
1017 | { |
1018 | unsigned int num_planes = 0, num_buffers, allocated_buffers; | |
37d9ed94 | 1019 | int ret; |
2d86401c GL |
1020 | |
1021 | if (q->num_buffers == VIDEO_MAX_FRAME) { | |
fd4354cf | 1022 | dprintk(1, "maximum number of buffers already allocated\n"); |
2d86401c GL |
1023 | return -ENOBUFS; |
1024 | } | |
1025 | ||
2d86401c GL |
1026 | if (!q->num_buffers) { |
1027 | memset(q->plane_sizes, 0, sizeof(q->plane_sizes)); | |
1028 | memset(q->alloc_ctx, 0, sizeof(q->alloc_ctx)); | |
1029 | q->memory = create->memory; | |
58d75f4b | 1030 | q->waiting_for_buffers = !V4L2_TYPE_IS_OUTPUT(q->type); |
2d86401c GL |
1031 | } |
1032 | ||
1033 | num_buffers = min(create->count, VIDEO_MAX_FRAME - q->num_buffers); | |
1034 | ||
1035 | /* | |
1036 | * Ask the driver, whether the requested number of buffers, planes per | |
1037 | * buffer and their sizes are acceptable | |
1038 | */ | |
1039 | ret = call_qop(q, queue_setup, q, &create->format, &num_buffers, | |
1040 | &num_planes, q->plane_sizes, q->alloc_ctx); | |
a1d36d8c | 1041 | if (ret) |
2d86401c GL |
1042 | return ret; |
1043 | ||
1044 | /* Finally, allocate buffers and video memory */ | |
a7afcacc | 1045 | allocated_buffers = __vb2_queue_alloc(q, create->memory, num_buffers, |
2d86401c | 1046 | num_planes); |
a7afcacc | 1047 | if (allocated_buffers == 0) { |
3050040b | 1048 | dprintk(1, "memory allocation failed\n"); |
f05393d2 | 1049 | return -ENOMEM; |
2d86401c GL |
1050 | } |
1051 | ||
2d86401c GL |
1052 | /* |
1053 | * Check if driver can handle the so far allocated number of buffers. | |
1054 | */ | |
a7afcacc HV |
1055 | if (allocated_buffers < num_buffers) { |
1056 | num_buffers = allocated_buffers; | |
2d86401c GL |
1057 | |
1058 | /* | |
1059 | * q->num_buffers contains the total number of buffers, that the | |
1060 | * queue driver has set up | |
1061 | */ | |
1062 | ret = call_qop(q, queue_setup, q, &create->format, &num_buffers, | |
1063 | &num_planes, q->plane_sizes, q->alloc_ctx); | |
1064 | ||
1065 | if (!ret && allocated_buffers < num_buffers) | |
1066 | ret = -ENOMEM; | |
1067 | ||
1068 | /* | |
1069 | * Either the driver has accepted a smaller number of buffers, | |
1070 | * or .queue_setup() returned an error | |
1071 | */ | |
1072 | } | |
1073 | ||
f035eb4e | 1074 | mutex_lock(&q->mmap_lock); |
2d86401c GL |
1075 | q->num_buffers += allocated_buffers; |
1076 | ||
1077 | if (ret < 0) { | |
a7afcacc HV |
1078 | /* |
1079 | * Note: __vb2_queue_free() will subtract 'allocated_buffers' | |
1080 | * from q->num_buffers. | |
1081 | */ | |
2d86401c | 1082 | __vb2_queue_free(q, allocated_buffers); |
f035eb4e | 1083 | mutex_unlock(&q->mmap_lock); |
f05393d2 | 1084 | return -ENOMEM; |
2d86401c | 1085 | } |
f035eb4e | 1086 | mutex_unlock(&q->mmap_lock); |
2d86401c GL |
1087 | |
1088 | /* | |
1089 | * Return the number of successfully allocated buffers | |
1090 | * to the userspace. | |
1091 | */ | |
1092 | create->count = allocated_buffers; | |
1093 | ||
1094 | return 0; | |
1095 | } | |
37d9ed94 HV |
1096 | |
1097 | /** | |
53aa3b19 NT |
1098 | * vb2_create_bufs() - Wrapper for __create_bufs() that also verifies the |
1099 | * memory and type values. | |
37d9ed94 HV |
1100 | * @q: videobuf2 queue |
1101 | * @create: creation parameters, passed from userspace to vidioc_create_bufs | |
1102 | * handler in driver | |
1103 | */ | |
1104 | int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) | |
1105 | { | |
1106 | int ret = __verify_memory_type(q, create->memory, create->format.type); | |
1107 | ||
1108 | create->index = q->num_buffers; | |
f05393d2 HV |
1109 | if (create->count == 0) |
1110 | return ret != -EBUSY ? ret : 0; | |
37d9ed94 HV |
1111 | return ret ? ret : __create_bufs(q, create); |
1112 | } | |
2d86401c GL |
1113 | EXPORT_SYMBOL_GPL(vb2_create_bufs); |
1114 | ||
e23ccc0a PO |
1115 | /** |
1116 | * vb2_plane_vaddr() - Return a kernel virtual address of a given plane | |
1117 | * @vb: vb2_buffer to which the plane in question belongs to | |
1118 | * @plane_no: plane number for which the address is to be returned | |
1119 | * | |
1120 | * This function returns a kernel virtual address of a given plane if | |
1121 | * such a mapping exist, NULL otherwise. | |
1122 | */ | |
1123 | void *vb2_plane_vaddr(struct vb2_buffer *vb, unsigned int plane_no) | |
1124 | { | |
a00d0266 | 1125 | if (plane_no > vb->num_planes || !vb->planes[plane_no].mem_priv) |
e23ccc0a PO |
1126 | return NULL; |
1127 | ||
a1d36d8c | 1128 | return call_ptr_memop(vb, vaddr, vb->planes[plane_no].mem_priv); |
e23ccc0a PO |
1129 | |
1130 | } | |
1131 | EXPORT_SYMBOL_GPL(vb2_plane_vaddr); | |
1132 | ||
1133 | /** | |
1134 | * vb2_plane_cookie() - Return allocator specific cookie for the given plane | |
1135 | * @vb: vb2_buffer to which the plane in question belongs to | |
1136 | * @plane_no: plane number for which the cookie is to be returned | |
1137 | * | |
1138 | * This function returns an allocator specific cookie for a given plane if | |
1139 | * available, NULL otherwise. The allocator should provide some simple static | |
1140 | * inline function, which would convert this cookie to the allocator specific | |
1141 | * type that can be used directly by the driver to access the buffer. This can | |
1142 | * be for example physical address, pointer to scatter list or IOMMU mapping. | |
1143 | */ | |
1144 | void *vb2_plane_cookie(struct vb2_buffer *vb, unsigned int plane_no) | |
1145 | { | |
a9ae4692 | 1146 | if (plane_no >= vb->num_planes || !vb->planes[plane_no].mem_priv) |
e23ccc0a PO |
1147 | return NULL; |
1148 | ||
a1d36d8c | 1149 | return call_ptr_memop(vb, cookie, vb->planes[plane_no].mem_priv); |
e23ccc0a PO |
1150 | } |
1151 | EXPORT_SYMBOL_GPL(vb2_plane_cookie); | |
1152 | ||
1153 | /** | |
1154 | * vb2_buffer_done() - inform videobuf that an operation on a buffer is finished | |
1155 | * @vb: vb2_buffer returned from the driver | |
1156 | * @state: either VB2_BUF_STATE_DONE if the operation finished successfully | |
b3379c62 HV |
1157 | * or VB2_BUF_STATE_ERROR if the operation finished with an error. |
1158 | * If start_streaming fails then it should return buffers with state | |
1159 | * VB2_BUF_STATE_QUEUED to put them back into the queue. | |
e23ccc0a PO |
1160 | * |
1161 | * This function should be called by the driver after a hardware operation on | |
1162 | * a buffer is finished and the buffer may be returned to userspace. The driver | |
1163 | * cannot use this buffer anymore until it is queued back to it by videobuf | |
1164 | * by the means of buf_queue callback. Only buffers previously queued to the | |
1165 | * driver by buf_queue can be passed to this function. | |
b3379c62 HV |
1166 | * |
1167 | * While streaming a buffer can only be returned in state DONE or ERROR. | |
1168 | * The start_streaming op can also return them in case the DMA engine cannot | |
1169 | * be started for some reason. In that case the buffers should be returned with | |
1170 | * state QUEUED. | |
e23ccc0a PO |
1171 | */ |
1172 | void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state) | |
1173 | { | |
1174 | struct vb2_queue *q = vb->vb2_queue; | |
1175 | unsigned long flags; | |
3e0c2f20 | 1176 | unsigned int plane; |
e23ccc0a | 1177 | |
b3379c62 | 1178 | if (WARN_ON(vb->state != VB2_BUF_STATE_ACTIVE)) |
e23ccc0a PO |
1179 | return; |
1180 | ||
bf3593d9 HV |
1181 | if (WARN_ON(state != VB2_BUF_STATE_DONE && |
1182 | state != VB2_BUF_STATE_ERROR && | |
1183 | state != VB2_BUF_STATE_QUEUED)) | |
1184 | state = VB2_BUF_STATE_ERROR; | |
e23ccc0a | 1185 | |
b5b4541e HV |
1186 | #ifdef CONFIG_VIDEO_ADV_DEBUG |
1187 | /* | |
1188 | * Although this is not a callback, it still does have to balance | |
1189 | * with the buf_queue op. So update this counter manually. | |
1190 | */ | |
1191 | vb->cnt_buf_done++; | |
1192 | #endif | |
3050040b | 1193 | dprintk(4, "done processing on buffer %d, state: %d\n", |
9b6f5dc0 | 1194 | vb->v4l2_buf.index, state); |
e23ccc0a | 1195 | |
3e0c2f20 MS |
1196 | /* sync buffers */ |
1197 | for (plane = 0; plane < vb->num_planes; ++plane) | |
a1d36d8c | 1198 | call_void_memop(vb, finish, vb->planes[plane].mem_priv); |
3e0c2f20 | 1199 | |
e23ccc0a PO |
1200 | /* Add the buffer to the done buffers list */ |
1201 | spin_lock_irqsave(&q->done_lock, flags); | |
1202 | vb->state = state; | |
b3379c62 HV |
1203 | if (state != VB2_BUF_STATE_QUEUED) |
1204 | list_add_tail(&vb->done_entry, &q->done_list); | |
6ea3b980 | 1205 | atomic_dec(&q->owned_by_drv_count); |
e23ccc0a PO |
1206 | spin_unlock_irqrestore(&q->done_lock, flags); |
1207 | ||
b3379c62 HV |
1208 | if (state == VB2_BUF_STATE_QUEUED) |
1209 | return; | |
1210 | ||
e23ccc0a PO |
1211 | /* Inform any processes that may be waiting for buffers */ |
1212 | wake_up(&q->done_wq); | |
1213 | } | |
1214 | EXPORT_SYMBOL_GPL(vb2_buffer_done); | |
1215 | ||
34ea4d44 LP |
1216 | /** |
1217 | * vb2_discard_done() - discard all buffers marked as DONE | |
1218 | * @q: videobuf2 queue | |
1219 | * | |
1220 | * This function is intended to be used with suspend/resume operations. It | |
1221 | * discards all 'done' buffers as they would be too old to be requested after | |
1222 | * resume. | |
1223 | * | |
1224 | * Drivers must stop the hardware and synchronize with interrupt handlers and/or | |
1225 | * delayed works before calling this function to make sure no buffer will be | |
1226 | * touched by the driver and/or hardware. | |
1227 | */ | |
1228 | void vb2_discard_done(struct vb2_queue *q) | |
1229 | { | |
1230 | struct vb2_buffer *vb; | |
1231 | unsigned long flags; | |
1232 | ||
1233 | spin_lock_irqsave(&q->done_lock, flags); | |
1234 | list_for_each_entry(vb, &q->done_list, done_entry) | |
1235 | vb->state = VB2_BUF_STATE_ERROR; | |
1236 | spin_unlock_irqrestore(&q->done_lock, flags); | |
1237 | } | |
1238 | EXPORT_SYMBOL_GPL(vb2_discard_done); | |
1239 | ||
e23ccc0a | 1240 | /** |
32a77260 HV |
1241 | * __fill_vb2_buffer() - fill a vb2_buffer with information provided in a |
1242 | * v4l2_buffer by the userspace. The caller has already verified that struct | |
1243 | * v4l2_buffer has a valid number of planes. | |
e23ccc0a | 1244 | */ |
32a77260 | 1245 | static void __fill_vb2_buffer(struct vb2_buffer *vb, const struct v4l2_buffer *b, |
e23ccc0a PO |
1246 | struct v4l2_plane *v4l2_planes) |
1247 | { | |
1248 | unsigned int plane; | |
e23ccc0a PO |
1249 | |
1250 | if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) { | |
e23ccc0a PO |
1251 | if (b->memory == V4L2_MEMORY_USERPTR) { |
1252 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
1253 | v4l2_planes[plane].m.userptr = | |
1254 | b->m.planes[plane].m.userptr; | |
1255 | v4l2_planes[plane].length = | |
1256 | b->m.planes[plane].length; | |
1257 | } | |
1258 | } | |
c5384048 SS |
1259 | if (b->memory == V4L2_MEMORY_DMABUF) { |
1260 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
1261 | v4l2_planes[plane].m.fd = | |
1262 | b->m.planes[plane].m.fd; | |
1263 | v4l2_planes[plane].length = | |
1264 | b->m.planes[plane].length; | |
c5384048 SS |
1265 | } |
1266 | } | |
8a75ffb8 HV |
1267 | |
1268 | /* Fill in driver-provided information for OUTPUT types */ | |
1269 | if (V4L2_TYPE_IS_OUTPUT(b->type)) { | |
1270 | /* | |
1271 | * Will have to go up to b->length when API starts | |
1272 | * accepting variable number of planes. | |
1273 | * | |
1274 | * If bytesused == 0 for the output buffer, then fall | |
1275 | * back to the full buffer size. In that case | |
1276 | * userspace clearly never bothered to set it and | |
1277 | * it's a safe assumption that they really meant to | |
1278 | * use the full plane sizes. | |
1279 | */ | |
1280 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
1281 | struct v4l2_plane *pdst = &v4l2_planes[plane]; | |
1282 | struct v4l2_plane *psrc = &b->m.planes[plane]; | |
1283 | ||
1284 | pdst->bytesused = psrc->bytesused ? | |
1285 | psrc->bytesused : pdst->length; | |
1286 | pdst->data_offset = psrc->data_offset; | |
1287 | } | |
1288 | } | |
e23ccc0a PO |
1289 | } else { |
1290 | /* | |
1291 | * Single-planar buffers do not use planes array, | |
1292 | * so fill in relevant v4l2_buffer struct fields instead. | |
1293 | * In videobuf we use our internal V4l2_planes struct for | |
1294 | * single-planar buffers as well, for simplicity. | |
61bd8fb3 | 1295 | * |
8a75ffb8 HV |
1296 | * If bytesused == 0 for the output buffer, then fall back |
1297 | * to the full buffer size as that's a sensible default. | |
e23ccc0a | 1298 | */ |
e23ccc0a PO |
1299 | if (b->memory == V4L2_MEMORY_USERPTR) { |
1300 | v4l2_planes[0].m.userptr = b->m.userptr; | |
1301 | v4l2_planes[0].length = b->length; | |
1302 | } | |
c5384048 SS |
1303 | |
1304 | if (b->memory == V4L2_MEMORY_DMABUF) { | |
1305 | v4l2_planes[0].m.fd = b->m.fd; | |
1306 | v4l2_planes[0].length = b->length; | |
c5384048 | 1307 | } |
8a75ffb8 HV |
1308 | |
1309 | if (V4L2_TYPE_IS_OUTPUT(b->type)) | |
1310 | v4l2_planes[0].bytesused = b->bytesused ? | |
1311 | b->bytesused : v4l2_planes[0].length; | |
1312 | else | |
1313 | v4l2_planes[0].bytesused = 0; | |
1314 | ||
e23ccc0a PO |
1315 | } |
1316 | ||
f1343281 | 1317 | /* Zero flags that the vb2 core handles */ |
1b18e7a0 | 1318 | vb->v4l2_buf.flags = b->flags & ~V4L2_BUFFER_MASK_FLAGS; |
7ce6fd8f SA |
1319 | if ((vb->vb2_queue->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) != |
1320 | V4L2_BUF_FLAG_TIMESTAMP_COPY || !V4L2_TYPE_IS_OUTPUT(b->type)) { | |
1321 | /* | |
1322 | * Non-COPY timestamps and non-OUTPUT queues will get | |
1323 | * their timestamp and timestamp source flags from the | |
1324 | * queue. | |
1325 | */ | |
1326 | vb->v4l2_buf.flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK; | |
1327 | } | |
1328 | ||
f1343281 HV |
1329 | if (V4L2_TYPE_IS_OUTPUT(b->type)) { |
1330 | /* | |
1331 | * For output buffers mask out the timecode flag: | |
1332 | * this will be handled later in vb2_internal_qbuf(). | |
1333 | * The 'field' is valid metadata for this output buffer | |
1334 | * and so that needs to be copied here. | |
1335 | */ | |
1336 | vb->v4l2_buf.flags &= ~V4L2_BUF_FLAG_TIMECODE; | |
1337 | vb->v4l2_buf.field = b->field; | |
1338 | } else { | |
1339 | /* Zero any output buffer flags as this is a capture buffer */ | |
1340 | vb->v4l2_buf.flags &= ~V4L2_BUFFER_OUT_FLAGS; | |
1341 | } | |
e23ccc0a PO |
1342 | } |
1343 | ||
dcc2428a HV |
1344 | /** |
1345 | * __qbuf_mmap() - handle qbuf of an MMAP buffer | |
1346 | */ | |
1347 | static int __qbuf_mmap(struct vb2_buffer *vb, const struct v4l2_buffer *b) | |
1348 | { | |
1349 | __fill_vb2_buffer(vb, b, vb->v4l2_planes); | |
1350 | return call_vb_qop(vb, buf_prepare, vb); | |
1351 | } | |
1352 | ||
e23ccc0a PO |
1353 | /** |
1354 | * __qbuf_userptr() - handle qbuf of a USERPTR buffer | |
1355 | */ | |
2d86401c | 1356 | static int __qbuf_userptr(struct vb2_buffer *vb, const struct v4l2_buffer *b) |
e23ccc0a PO |
1357 | { |
1358 | struct v4l2_plane planes[VIDEO_MAX_PLANES]; | |
1359 | struct vb2_queue *q = vb->vb2_queue; | |
1360 | void *mem_priv; | |
1361 | unsigned int plane; | |
1362 | int ret; | |
cd474037 HV |
1363 | enum dma_data_direction dma_dir = |
1364 | V4L2_TYPE_IS_OUTPUT(q->type) ? DMA_TO_DEVICE : DMA_FROM_DEVICE; | |
256f3162 | 1365 | bool reacquired = vb->planes[0].mem_priv == NULL; |
e23ccc0a | 1366 | |
412376a1 | 1367 | memset(planes, 0, sizeof(planes[0]) * vb->num_planes); |
32a77260 HV |
1368 | /* Copy relevant information provided by the userspace */ |
1369 | __fill_vb2_buffer(vb, b, planes); | |
e23ccc0a PO |
1370 | |
1371 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
1372 | /* Skip the plane if already verified */ | |
f0b7c7fc MS |
1373 | if (vb->v4l2_planes[plane].m.userptr && |
1374 | vb->v4l2_planes[plane].m.userptr == planes[plane].m.userptr | |
e23ccc0a PO |
1375 | && vb->v4l2_planes[plane].length == planes[plane].length) |
1376 | continue; | |
1377 | ||
fd4354cf | 1378 | dprintk(3, "userspace address for plane %d changed, " |
e23ccc0a PO |
1379 | "reacquiring memory\n", plane); |
1380 | ||
c1426bc7 MS |
1381 | /* Check if the provided plane buffer is large enough */ |
1382 | if (planes[plane].length < q->plane_sizes[plane]) { | |
fd4354cf | 1383 | dprintk(1, "provided buffer size %u is less than " |
2484a7e2 SWK |
1384 | "setup size %u for plane %d\n", |
1385 | planes[plane].length, | |
1386 | q->plane_sizes[plane], plane); | |
4c2625db | 1387 | ret = -EINVAL; |
c1426bc7 MS |
1388 | goto err; |
1389 | } | |
1390 | ||
e23ccc0a | 1391 | /* Release previously acquired memory if present */ |
256f3162 HV |
1392 | if (vb->planes[plane].mem_priv) { |
1393 | if (!reacquired) { | |
1394 | reacquired = true; | |
a1d36d8c | 1395 | call_void_vb_qop(vb, buf_cleanup, vb); |
256f3162 | 1396 | } |
a1d36d8c | 1397 | call_void_memop(vb, put_userptr, vb->planes[plane].mem_priv); |
256f3162 | 1398 | } |
e23ccc0a PO |
1399 | |
1400 | vb->planes[plane].mem_priv = NULL; | |
256f3162 | 1401 | memset(&vb->v4l2_planes[plane], 0, sizeof(struct v4l2_plane)); |
e23ccc0a PO |
1402 | |
1403 | /* Acquire each plane's memory */ | |
a1d36d8c | 1404 | mem_priv = call_ptr_memop(vb, get_userptr, q->alloc_ctx[plane], |
a00d0266 | 1405 | planes[plane].m.userptr, |
cd474037 | 1406 | planes[plane].length, dma_dir); |
a00d0266 | 1407 | if (IS_ERR_OR_NULL(mem_priv)) { |
fd4354cf | 1408 | dprintk(1, "failed acquiring userspace " |
e23ccc0a | 1409 | "memory for plane %d\n", plane); |
a00d0266 MS |
1410 | ret = mem_priv ? PTR_ERR(mem_priv) : -EINVAL; |
1411 | goto err; | |
e23ccc0a | 1412 | } |
a00d0266 | 1413 | vb->planes[plane].mem_priv = mem_priv; |
e23ccc0a PO |
1414 | } |
1415 | ||
e23ccc0a PO |
1416 | /* |
1417 | * Now that everything is in order, copy relevant information | |
1418 | * provided by userspace. | |
1419 | */ | |
1420 | for (plane = 0; plane < vb->num_planes; ++plane) | |
1421 | vb->v4l2_planes[plane] = planes[plane]; | |
1422 | ||
256f3162 HV |
1423 | if (reacquired) { |
1424 | /* | |
1425 | * One or more planes changed, so we must call buf_init to do | |
1426 | * the driver-specific initialization on the newly acquired | |
1427 | * buffer, if provided. | |
1428 | */ | |
1429 | ret = call_vb_qop(vb, buf_init, vb); | |
1430 | if (ret) { | |
fd4354cf | 1431 | dprintk(1, "buffer initialization failed\n"); |
256f3162 HV |
1432 | goto err; |
1433 | } | |
1434 | } | |
1435 | ||
1436 | ret = call_vb_qop(vb, buf_prepare, vb); | |
1437 | if (ret) { | |
fd4354cf | 1438 | dprintk(1, "buffer preparation failed\n"); |
a1d36d8c | 1439 | call_void_vb_qop(vb, buf_cleanup, vb); |
256f3162 HV |
1440 | goto err; |
1441 | } | |
1442 | ||
e23ccc0a PO |
1443 | return 0; |
1444 | err: | |
1445 | /* In case of errors, release planes that were already acquired */ | |
c1426bc7 MS |
1446 | for (plane = 0; plane < vb->num_planes; ++plane) { |
1447 | if (vb->planes[plane].mem_priv) | |
a1d36d8c | 1448 | call_void_memop(vb, put_userptr, vb->planes[plane].mem_priv); |
c1426bc7 MS |
1449 | vb->planes[plane].mem_priv = NULL; |
1450 | vb->v4l2_planes[plane].m.userptr = 0; | |
1451 | vb->v4l2_planes[plane].length = 0; | |
e23ccc0a PO |
1452 | } |
1453 | ||
1454 | return ret; | |
1455 | } | |
1456 | ||
c5384048 SS |
1457 | /** |
1458 | * __qbuf_dmabuf() - handle qbuf of a DMABUF buffer | |
1459 | */ | |
1460 | static int __qbuf_dmabuf(struct vb2_buffer *vb, const struct v4l2_buffer *b) | |
1461 | { | |
1462 | struct v4l2_plane planes[VIDEO_MAX_PLANES]; | |
1463 | struct vb2_queue *q = vb->vb2_queue; | |
1464 | void *mem_priv; | |
1465 | unsigned int plane; | |
1466 | int ret; | |
cd474037 HV |
1467 | enum dma_data_direction dma_dir = |
1468 | V4L2_TYPE_IS_OUTPUT(q->type) ? DMA_TO_DEVICE : DMA_FROM_DEVICE; | |
256f3162 | 1469 | bool reacquired = vb->planes[0].mem_priv == NULL; |
c5384048 | 1470 | |
412376a1 | 1471 | memset(planes, 0, sizeof(planes[0]) * vb->num_planes); |
6f546c5f | 1472 | /* Copy relevant information provided by the userspace */ |
c5384048 SS |
1473 | __fill_vb2_buffer(vb, b, planes); |
1474 | ||
1475 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
1476 | struct dma_buf *dbuf = dma_buf_get(planes[plane].m.fd); | |
1477 | ||
1478 | if (IS_ERR_OR_NULL(dbuf)) { | |
fd4354cf | 1479 | dprintk(1, "invalid dmabuf fd for plane %d\n", |
c5384048 SS |
1480 | plane); |
1481 | ret = -EINVAL; | |
1482 | goto err; | |
1483 | } | |
1484 | ||
1485 | /* use DMABUF size if length is not provided */ | |
1486 | if (planes[plane].length == 0) | |
1487 | planes[plane].length = dbuf->size; | |
1488 | ||
412376a1 | 1489 | if (planes[plane].length < q->plane_sizes[plane]) { |
fd4354cf | 1490 | dprintk(1, "invalid dmabuf length for plane %d\n", |
77c0782e | 1491 | plane); |
c5384048 SS |
1492 | ret = -EINVAL; |
1493 | goto err; | |
1494 | } | |
1495 | ||
1496 | /* Skip the plane if already verified */ | |
1497 | if (dbuf == vb->planes[plane].dbuf && | |
1498 | vb->v4l2_planes[plane].length == planes[plane].length) { | |
1499 | dma_buf_put(dbuf); | |
1500 | continue; | |
1501 | } | |
1502 | ||
fd4354cf | 1503 | dprintk(1, "buffer for plane %d changed\n", plane); |
c5384048 | 1504 | |
256f3162 HV |
1505 | if (!reacquired) { |
1506 | reacquired = true; | |
a1d36d8c | 1507 | call_void_vb_qop(vb, buf_cleanup, vb); |
256f3162 HV |
1508 | } |
1509 | ||
c5384048 | 1510 | /* Release previously acquired memory if present */ |
b5b4541e | 1511 | __vb2_plane_dmabuf_put(vb, &vb->planes[plane]); |
c5384048 SS |
1512 | memset(&vb->v4l2_planes[plane], 0, sizeof(struct v4l2_plane)); |
1513 | ||
1514 | /* Acquire each plane's memory */ | |
a1d36d8c | 1515 | mem_priv = call_ptr_memop(vb, attach_dmabuf, q->alloc_ctx[plane], |
cd474037 | 1516 | dbuf, planes[plane].length, dma_dir); |
c5384048 | 1517 | if (IS_ERR(mem_priv)) { |
fd4354cf | 1518 | dprintk(1, "failed to attach dmabuf\n"); |
c5384048 SS |
1519 | ret = PTR_ERR(mem_priv); |
1520 | dma_buf_put(dbuf); | |
1521 | goto err; | |
1522 | } | |
1523 | ||
1524 | vb->planes[plane].dbuf = dbuf; | |
1525 | vb->planes[plane].mem_priv = mem_priv; | |
1526 | } | |
1527 | ||
1528 | /* TODO: This pins the buffer(s) with dma_buf_map_attachment()).. but | |
1529 | * really we want to do this just before the DMA, not while queueing | |
1530 | * the buffer(s).. | |
1531 | */ | |
1532 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
b5b4541e | 1533 | ret = call_memop(vb, map_dmabuf, vb->planes[plane].mem_priv); |
c5384048 | 1534 | if (ret) { |
fd4354cf | 1535 | dprintk(1, "failed to map dmabuf for plane %d\n", |
c5384048 SS |
1536 | plane); |
1537 | goto err; | |
1538 | } | |
1539 | vb->planes[plane].dbuf_mapped = 1; | |
1540 | } | |
1541 | ||
c5384048 SS |
1542 | /* |
1543 | * Now that everything is in order, copy relevant information | |
1544 | * provided by userspace. | |
1545 | */ | |
1546 | for (plane = 0; plane < vb->num_planes; ++plane) | |
1547 | vb->v4l2_planes[plane] = planes[plane]; | |
1548 | ||
256f3162 HV |
1549 | if (reacquired) { |
1550 | /* | |
1551 | * Call driver-specific initialization on the newly acquired buffer, | |
1552 | * if provided. | |
1553 | */ | |
1554 | ret = call_vb_qop(vb, buf_init, vb); | |
1555 | if (ret) { | |
fd4354cf | 1556 | dprintk(1, "buffer initialization failed\n"); |
256f3162 HV |
1557 | goto err; |
1558 | } | |
1559 | } | |
1560 | ||
1561 | ret = call_vb_qop(vb, buf_prepare, vb); | |
1562 | if (ret) { | |
fd4354cf | 1563 | dprintk(1, "buffer preparation failed\n"); |
a1d36d8c | 1564 | call_void_vb_qop(vb, buf_cleanup, vb); |
256f3162 HV |
1565 | goto err; |
1566 | } | |
1567 | ||
c5384048 SS |
1568 | return 0; |
1569 | err: | |
1570 | /* In case of errors, release planes that were already acquired */ | |
1571 | __vb2_buf_dmabuf_put(vb); | |
1572 | ||
1573 | return ret; | |
1574 | } | |
1575 | ||
e23ccc0a PO |
1576 | /** |
1577 | * __enqueue_in_driver() - enqueue a vb2_buffer in driver for processing | |
1578 | */ | |
1579 | static void __enqueue_in_driver(struct vb2_buffer *vb) | |
1580 | { | |
1581 | struct vb2_queue *q = vb->vb2_queue; | |
3e0c2f20 | 1582 | unsigned int plane; |
e23ccc0a PO |
1583 | |
1584 | vb->state = VB2_BUF_STATE_ACTIVE; | |
6ea3b980 | 1585 | atomic_inc(&q->owned_by_drv_count); |
3e0c2f20 MS |
1586 | |
1587 | /* sync buffers */ | |
1588 | for (plane = 0; plane < vb->num_planes; ++plane) | |
a1d36d8c | 1589 | call_void_memop(vb, prepare, vb->planes[plane].mem_priv); |
3e0c2f20 | 1590 | |
a1d36d8c | 1591 | call_void_vb_qop(vb, buf_queue, vb); |
e23ccc0a PO |
1592 | } |
1593 | ||
2d86401c | 1594 | static int __buf_prepare(struct vb2_buffer *vb, const struct v4l2_buffer *b) |
ebc087d0 GL |
1595 | { |
1596 | struct vb2_queue *q = vb->vb2_queue; | |
1597 | int ret; | |
1598 | ||
8023ed09 | 1599 | ret = __verify_length(vb, b); |
3a9621b0 | 1600 | if (ret < 0) { |
fd4354cf | 1601 | dprintk(1, "plane parameters verification failed: %d\n", ret); |
8023ed09 | 1602 | return ret; |
3a9621b0 | 1603 | } |
e35e41b5 HV |
1604 | if (b->field == V4L2_FIELD_ALTERNATE && V4L2_TYPE_IS_OUTPUT(q->type)) { |
1605 | /* | |
1606 | * If the format's field is ALTERNATE, then the buffer's field | |
1607 | * should be either TOP or BOTTOM, not ALTERNATE since that | |
1608 | * makes no sense. The driver has to know whether the | |
1609 | * buffer represents a top or a bottom field in order to | |
1610 | * program any DMA correctly. Using ALTERNATE is wrong, since | |
1611 | * that just says that it is either a top or a bottom field, | |
1612 | * but not which of the two it is. | |
1613 | */ | |
1614 | dprintk(1, "the field is incorrectly set to ALTERNATE for an output buffer\n"); | |
1615 | return -EINVAL; | |
1616 | } | |
8023ed09 | 1617 | |
4bb7267d LP |
1618 | if (q->error) { |
1619 | dprintk(1, "fatal error occurred on queue\n"); | |
1620 | return -EIO; | |
1621 | } | |
1622 | ||
b18a8ff2 | 1623 | vb->state = VB2_BUF_STATE_PREPARING; |
f1343281 HV |
1624 | vb->v4l2_buf.timestamp.tv_sec = 0; |
1625 | vb->v4l2_buf.timestamp.tv_usec = 0; | |
1626 | vb->v4l2_buf.sequence = 0; | |
1627 | ||
ebc087d0 GL |
1628 | switch (q->memory) { |
1629 | case V4L2_MEMORY_MMAP: | |
1630 | ret = __qbuf_mmap(vb, b); | |
1631 | break; | |
1632 | case V4L2_MEMORY_USERPTR: | |
12561ad6 | 1633 | down_read(¤t->mm->mmap_sem); |
ebc087d0 | 1634 | ret = __qbuf_userptr(vb, b); |
12561ad6 | 1635 | up_read(¤t->mm->mmap_sem); |
ebc087d0 | 1636 | break; |
c5384048 SS |
1637 | case V4L2_MEMORY_DMABUF: |
1638 | ret = __qbuf_dmabuf(vb, b); | |
1639 | break; | |
ebc087d0 GL |
1640 | default: |
1641 | WARN(1, "Invalid queue type\n"); | |
1642 | ret = -EINVAL; | |
1643 | } | |
1644 | ||
ebc087d0 | 1645 | if (ret) |
fd4354cf | 1646 | dprintk(1, "buffer preparation failed: %d\n", ret); |
b18a8ff2 | 1647 | vb->state = ret ? VB2_BUF_STATE_DEQUEUED : VB2_BUF_STATE_PREPARED; |
ebc087d0 GL |
1648 | |
1649 | return ret; | |
1650 | } | |
1651 | ||
012043b8 | 1652 | static int vb2_queue_or_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b, |
4138111a | 1653 | const char *opname) |
2d86401c | 1654 | { |
2d86401c | 1655 | if (b->type != q->type) { |
fd4354cf | 1656 | dprintk(1, "%s: invalid buffer type\n", opname); |
b18a8ff2 | 1657 | return -EINVAL; |
2d86401c GL |
1658 | } |
1659 | ||
1660 | if (b->index >= q->num_buffers) { | |
fd4354cf | 1661 | dprintk(1, "%s: buffer index out of range\n", opname); |
b18a8ff2 | 1662 | return -EINVAL; |
2d86401c GL |
1663 | } |
1664 | ||
4138111a | 1665 | if (q->bufs[b->index] == NULL) { |
2d86401c | 1666 | /* Should never happen */ |
fd4354cf | 1667 | dprintk(1, "%s: buffer is NULL\n", opname); |
b18a8ff2 | 1668 | return -EINVAL; |
2d86401c GL |
1669 | } |
1670 | ||
1671 | if (b->memory != q->memory) { | |
fd4354cf | 1672 | dprintk(1, "%s: invalid memory type\n", opname); |
b18a8ff2 | 1673 | return -EINVAL; |
2d86401c GL |
1674 | } |
1675 | ||
4138111a | 1676 | return __verify_planes_array(q->bufs[b->index], b); |
012043b8 | 1677 | } |
2d86401c | 1678 | |
e23ccc0a | 1679 | /** |
012043b8 | 1680 | * vb2_prepare_buf() - Pass ownership of a buffer from userspace to the kernel |
e23ccc0a | 1681 | * @q: videobuf2 queue |
012043b8 LP |
1682 | * @b: buffer structure passed from userspace to vidioc_prepare_buf |
1683 | * handler in driver | |
e23ccc0a | 1684 | * |
012043b8 | 1685 | * Should be called from vidioc_prepare_buf ioctl handler of a driver. |
e23ccc0a PO |
1686 | * This function: |
1687 | * 1) verifies the passed buffer, | |
012043b8 LP |
1688 | * 2) calls buf_prepare callback in the driver (if provided), in which |
1689 | * driver-specific buffer initialization can be performed, | |
e23ccc0a PO |
1690 | * |
1691 | * The return values from this function are intended to be directly returned | |
012043b8 | 1692 | * from vidioc_prepare_buf handler in driver. |
e23ccc0a | 1693 | */ |
012043b8 | 1694 | int vb2_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b) |
e23ccc0a | 1695 | { |
4138111a | 1696 | struct vb2_buffer *vb; |
b2f2f047 HV |
1697 | int ret; |
1698 | ||
74753cff | 1699 | if (vb2_fileio_is_active(q)) { |
fd4354cf | 1700 | dprintk(1, "file io in progress\n"); |
b2f2f047 HV |
1701 | return -EBUSY; |
1702 | } | |
4138111a | 1703 | |
b2f2f047 | 1704 | ret = vb2_queue_or_prepare_buf(q, b, "prepare_buf"); |
4138111a HV |
1705 | if (ret) |
1706 | return ret; | |
1707 | ||
1708 | vb = q->bufs[b->index]; | |
1709 | if (vb->state != VB2_BUF_STATE_DEQUEUED) { | |
fd4354cf | 1710 | dprintk(1, "invalid buffer state %d\n", |
4138111a HV |
1711 | vb->state); |
1712 | return -EINVAL; | |
1713 | } | |
1714 | ||
1715 | ret = __buf_prepare(vb, b); | |
1716 | if (!ret) { | |
1717 | /* Fill buffer information for the userspace */ | |
1718 | __fill_v4l2_buffer(vb, b); | |
1719 | ||
fd4354cf | 1720 | dprintk(1, "prepare of buffer %d succeeded\n", vb->v4l2_buf.index); |
4138111a HV |
1721 | } |
1722 | return ret; | |
012043b8 LP |
1723 | } |
1724 | EXPORT_SYMBOL_GPL(vb2_prepare_buf); | |
e23ccc0a | 1725 | |
02f142ec HV |
1726 | /** |
1727 | * vb2_start_streaming() - Attempt to start streaming. | |
1728 | * @q: videobuf2 queue | |
1729 | * | |
b3379c62 HV |
1730 | * Attempt to start streaming. When this function is called there must be |
1731 | * at least q->min_buffers_needed buffers queued up (i.e. the minimum | |
1732 | * number of buffers required for the DMA engine to function). If the | |
1733 | * @start_streaming op fails it is supposed to return all the driver-owned | |
1734 | * buffers back to vb2 in state QUEUED. Check if that happened and if | |
1735 | * not warn and reclaim them forcefully. | |
02f142ec HV |
1736 | */ |
1737 | static int vb2_start_streaming(struct vb2_queue *q) | |
1738 | { | |
b3379c62 | 1739 | struct vb2_buffer *vb; |
02f142ec HV |
1740 | int ret; |
1741 | ||
02f142ec | 1742 | /* |
b3379c62 HV |
1743 | * If any buffers were queued before streamon, |
1744 | * we can now pass them to driver for processing. | |
02f142ec | 1745 | */ |
b3379c62 HV |
1746 | list_for_each_entry(vb, &q->queued_list, queued_entry) |
1747 | __enqueue_in_driver(vb); | |
1748 | ||
1749 | /* Tell the driver to start streaming */ | |
bd994ddb | 1750 | q->start_streaming_called = 1; |
b3379c62 HV |
1751 | ret = call_qop(q, start_streaming, q, |
1752 | atomic_read(&q->owned_by_drv_count)); | |
b3379c62 | 1753 | if (!ret) |
02f142ec | 1754 | return 0; |
b3379c62 | 1755 | |
bd994ddb LP |
1756 | q->start_streaming_called = 0; |
1757 | ||
fd4354cf | 1758 | dprintk(1, "driver refused to start streaming\n"); |
23cd08c8 HV |
1759 | /* |
1760 | * If you see this warning, then the driver isn't cleaning up properly | |
1761 | * after a failed start_streaming(). See the start_streaming() | |
1762 | * documentation in videobuf2-core.h for more information how buffers | |
1763 | * should be returned to vb2 in start_streaming(). | |
1764 | */ | |
b3379c62 HV |
1765 | if (WARN_ON(atomic_read(&q->owned_by_drv_count))) { |
1766 | unsigned i; | |
1767 | ||
1768 | /* | |
1769 | * Forcefully reclaim buffers if the driver did not | |
1770 | * correctly return them to vb2. | |
1771 | */ | |
1772 | for (i = 0; i < q->num_buffers; ++i) { | |
1773 | vb = q->bufs[i]; | |
1774 | if (vb->state == VB2_BUF_STATE_ACTIVE) | |
1775 | vb2_buffer_done(vb, VB2_BUF_STATE_QUEUED); | |
1776 | } | |
1777 | /* Must be zero now */ | |
1778 | WARN_ON(atomic_read(&q->owned_by_drv_count)); | |
02f142ec | 1779 | } |
bf3593d9 HV |
1780 | /* |
1781 | * If done_list is not empty, then start_streaming() didn't call | |
1782 | * vb2_buffer_done(vb, VB2_BUF_STATE_QUEUED) but STATE_ERROR or | |
1783 | * STATE_DONE. | |
1784 | */ | |
1785 | WARN_ON(!list_empty(&q->done_list)); | |
02f142ec HV |
1786 | return ret; |
1787 | } | |
1788 | ||
b2f2f047 | 1789 | static int vb2_internal_qbuf(struct vb2_queue *q, struct v4l2_buffer *b) |
012043b8 | 1790 | { |
4138111a HV |
1791 | int ret = vb2_queue_or_prepare_buf(q, b, "qbuf"); |
1792 | struct vb2_buffer *vb; | |
1793 | ||
1794 | if (ret) | |
1795 | return ret; | |
1796 | ||
1797 | vb = q->bufs[b->index]; | |
e23ccc0a | 1798 | |
ebc087d0 GL |
1799 | switch (vb->state) { |
1800 | case VB2_BUF_STATE_DEQUEUED: | |
1801 | ret = __buf_prepare(vb, b); | |
1802 | if (ret) | |
012043b8 | 1803 | return ret; |
4138111a | 1804 | break; |
ebc087d0 GL |
1805 | case VB2_BUF_STATE_PREPARED: |
1806 | break; | |
b18a8ff2 | 1807 | case VB2_BUF_STATE_PREPARING: |
fd4354cf | 1808 | dprintk(1, "buffer still being prepared\n"); |
b18a8ff2 | 1809 | return -EINVAL; |
ebc087d0 | 1810 | default: |
fd4354cf | 1811 | dprintk(1, "invalid buffer state %d\n", vb->state); |
012043b8 | 1812 | return -EINVAL; |
e23ccc0a PO |
1813 | } |
1814 | ||
e23ccc0a PO |
1815 | /* |
1816 | * Add to the queued buffers list, a buffer will stay on it until | |
1817 | * dequeued in dqbuf. | |
1818 | */ | |
1819 | list_add_tail(&vb->queued_entry, &q->queued_list); | |
b3379c62 | 1820 | q->queued_count++; |
58d75f4b | 1821 | q->waiting_for_buffers = false; |
e23ccc0a | 1822 | vb->state = VB2_BUF_STATE_QUEUED; |
f1343281 HV |
1823 | if (V4L2_TYPE_IS_OUTPUT(q->type)) { |
1824 | /* | |
1825 | * For output buffers copy the timestamp if needed, | |
1826 | * and the timecode field and flag if needed. | |
1827 | */ | |
c57ff792 SA |
1828 | if ((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == |
1829 | V4L2_BUF_FLAG_TIMESTAMP_COPY) | |
f1343281 HV |
1830 | vb->v4l2_buf.timestamp = b->timestamp; |
1831 | vb->v4l2_buf.flags |= b->flags & V4L2_BUF_FLAG_TIMECODE; | |
1832 | if (b->flags & V4L2_BUF_FLAG_TIMECODE) | |
1833 | vb->v4l2_buf.timecode = b->timecode; | |
1834 | } | |
e23ccc0a PO |
1835 | |
1836 | /* | |
1837 | * If already streaming, give the buffer to driver for processing. | |
1838 | * If not, the buffer will be given to driver on next streamon. | |
1839 | */ | |
b3379c62 | 1840 | if (q->start_streaming_called) |
e23ccc0a PO |
1841 | __enqueue_in_driver(vb); |
1842 | ||
4138111a HV |
1843 | /* Fill buffer information for the userspace */ |
1844 | __fill_v4l2_buffer(vb, b); | |
21db3e07 | 1845 | |
b3379c62 HV |
1846 | /* |
1847 | * If streamon has been called, and we haven't yet called | |
1848 | * start_streaming() since not enough buffers were queued, and | |
1849 | * we now have reached the minimum number of queued buffers, | |
1850 | * then we can finally call start_streaming(). | |
1851 | */ | |
1852 | if (q->streaming && !q->start_streaming_called && | |
1853 | q->queued_count >= q->min_buffers_needed) { | |
02f142ec HV |
1854 | ret = vb2_start_streaming(q); |
1855 | if (ret) | |
1856 | return ret; | |
1857 | } | |
1858 | ||
fd4354cf | 1859 | dprintk(1, "qbuf of buffer %d succeeded\n", vb->v4l2_buf.index); |
4138111a | 1860 | return 0; |
e23ccc0a | 1861 | } |
b2f2f047 HV |
1862 | |
1863 | /** | |
1864 | * vb2_qbuf() - Queue a buffer from userspace | |
1865 | * @q: videobuf2 queue | |
1866 | * @b: buffer structure passed from userspace to vidioc_qbuf handler | |
1867 | * in driver | |
1868 | * | |
1869 | * Should be called from vidioc_qbuf ioctl handler of a driver. | |
1870 | * This function: | |
1871 | * 1) verifies the passed buffer, | |
1872 | * 2) if necessary, calls buf_prepare callback in the driver (if provided), in | |
1873 | * which driver-specific buffer initialization can be performed, | |
1874 | * 3) if streaming is on, queues the buffer in driver by the means of buf_queue | |
1875 | * callback for processing. | |
1876 | * | |
1877 | * The return values from this function are intended to be directly returned | |
1878 | * from vidioc_qbuf handler in driver. | |
1879 | */ | |
1880 | int vb2_qbuf(struct vb2_queue *q, struct v4l2_buffer *b) | |
1881 | { | |
74753cff | 1882 | if (vb2_fileio_is_active(q)) { |
fd4354cf | 1883 | dprintk(1, "file io in progress\n"); |
b2f2f047 HV |
1884 | return -EBUSY; |
1885 | } | |
1886 | ||
1887 | return vb2_internal_qbuf(q, b); | |
1888 | } | |
e23ccc0a PO |
1889 | EXPORT_SYMBOL_GPL(vb2_qbuf); |
1890 | ||
1891 | /** | |
1892 | * __vb2_wait_for_done_vb() - wait for a buffer to become available | |
1893 | * for dequeuing | |
1894 | * | |
1895 | * Will sleep if required for nonblocking == false. | |
1896 | */ | |
1897 | static int __vb2_wait_for_done_vb(struct vb2_queue *q, int nonblocking) | |
1898 | { | |
1899 | /* | |
1900 | * All operations on vb_done_list are performed under done_lock | |
1901 | * spinlock protection. However, buffers may be removed from | |
1902 | * it and returned to userspace only while holding both driver's | |
1903 | * lock and the done_lock spinlock. Thus we can be sure that as | |
1904 | * long as we hold the driver's lock, the list will remain not | |
1905 | * empty if list_empty() check succeeds. | |
1906 | */ | |
1907 | ||
1908 | for (;;) { | |
1909 | int ret; | |
1910 | ||
1911 | if (!q->streaming) { | |
3050040b | 1912 | dprintk(1, "streaming off, will not wait for buffers\n"); |
e23ccc0a PO |
1913 | return -EINVAL; |
1914 | } | |
1915 | ||
4bb7267d LP |
1916 | if (q->error) { |
1917 | dprintk(1, "Queue in error state, will not wait for buffers\n"); | |
1918 | return -EIO; | |
1919 | } | |
1920 | ||
e23ccc0a PO |
1921 | if (!list_empty(&q->done_list)) { |
1922 | /* | |
1923 | * Found a buffer that we were waiting for. | |
1924 | */ | |
1925 | break; | |
1926 | } | |
1927 | ||
1928 | if (nonblocking) { | |
3050040b | 1929 | dprintk(1, "nonblocking and no buffers to dequeue, " |
e23ccc0a PO |
1930 | "will not wait\n"); |
1931 | return -EAGAIN; | |
1932 | } | |
1933 | ||
1934 | /* | |
1935 | * We are streaming and blocking, wait for another buffer to | |
1936 | * become ready or for streamoff. Driver's lock is released to | |
1937 | * allow streamoff or qbuf to be called while waiting. | |
1938 | */ | |
a1d36d8c | 1939 | call_void_qop(q, wait_prepare, q); |
e23ccc0a PO |
1940 | |
1941 | /* | |
1942 | * All locks have been released, it is safe to sleep now. | |
1943 | */ | |
3050040b | 1944 | dprintk(3, "will sleep waiting for buffers\n"); |
e23ccc0a | 1945 | ret = wait_event_interruptible(q->done_wq, |
4bb7267d LP |
1946 | !list_empty(&q->done_list) || !q->streaming || |
1947 | q->error); | |
e23ccc0a PO |
1948 | |
1949 | /* | |
1950 | * We need to reevaluate both conditions again after reacquiring | |
1951 | * the locks or return an error if one occurred. | |
1952 | */ | |
a1d36d8c | 1953 | call_void_qop(q, wait_finish, q); |
32a77260 | 1954 | if (ret) { |
3050040b | 1955 | dprintk(1, "sleep was interrupted\n"); |
e23ccc0a | 1956 | return ret; |
32a77260 | 1957 | } |
e23ccc0a PO |
1958 | } |
1959 | return 0; | |
1960 | } | |
1961 | ||
1962 | /** | |
1963 | * __vb2_get_done_vb() - get a buffer ready for dequeuing | |
1964 | * | |
1965 | * Will sleep if required for nonblocking == false. | |
1966 | */ | |
1967 | static int __vb2_get_done_vb(struct vb2_queue *q, struct vb2_buffer **vb, | |
32a77260 | 1968 | struct v4l2_buffer *b, int nonblocking) |
e23ccc0a PO |
1969 | { |
1970 | unsigned long flags; | |
1971 | int ret; | |
1972 | ||
1973 | /* | |
1974 | * Wait for at least one buffer to become available on the done_list. | |
1975 | */ | |
1976 | ret = __vb2_wait_for_done_vb(q, nonblocking); | |
1977 | if (ret) | |
1978 | return ret; | |
1979 | ||
1980 | /* | |
1981 | * Driver's lock has been held since we last verified that done_list | |
1982 | * is not empty, so no need for another list_empty(done_list) check. | |
1983 | */ | |
1984 | spin_lock_irqsave(&q->done_lock, flags); | |
1985 | *vb = list_first_entry(&q->done_list, struct vb2_buffer, done_entry); | |
32a77260 HV |
1986 | /* |
1987 | * Only remove the buffer from done_list if v4l2_buffer can handle all | |
1988 | * the planes. | |
1989 | */ | |
1990 | ret = __verify_planes_array(*vb, b); | |
1991 | if (!ret) | |
1992 | list_del(&(*vb)->done_entry); | |
e23ccc0a PO |
1993 | spin_unlock_irqrestore(&q->done_lock, flags); |
1994 | ||
32a77260 | 1995 | return ret; |
e23ccc0a PO |
1996 | } |
1997 | ||
1998 | /** | |
1999 | * vb2_wait_for_all_buffers() - wait until all buffers are given back to vb2 | |
2000 | * @q: videobuf2 queue | |
2001 | * | |
2002 | * This function will wait until all buffers that have been given to the driver | |
2003 | * by buf_queue() are given back to vb2 with vb2_buffer_done(). It doesn't call | |
2004 | * wait_prepare, wait_finish pair. It is intended to be called with all locks | |
2005 | * taken, for example from stop_streaming() callback. | |
2006 | */ | |
2007 | int vb2_wait_for_all_buffers(struct vb2_queue *q) | |
2008 | { | |
2009 | if (!q->streaming) { | |
3050040b | 2010 | dprintk(1, "streaming off, will not wait for buffers\n"); |
e23ccc0a PO |
2011 | return -EINVAL; |
2012 | } | |
2013 | ||
b3379c62 | 2014 | if (q->start_streaming_called) |
6ea3b980 | 2015 | wait_event(q->done_wq, !atomic_read(&q->owned_by_drv_count)); |
e23ccc0a PO |
2016 | return 0; |
2017 | } | |
2018 | EXPORT_SYMBOL_GPL(vb2_wait_for_all_buffers); | |
2019 | ||
c5384048 SS |
2020 | /** |
2021 | * __vb2_dqbuf() - bring back the buffer to the DEQUEUED state | |
2022 | */ | |
2023 | static void __vb2_dqbuf(struct vb2_buffer *vb) | |
2024 | { | |
2025 | struct vb2_queue *q = vb->vb2_queue; | |
2026 | unsigned int i; | |
2027 | ||
2028 | /* nothing to do if the buffer is already dequeued */ | |
2029 | if (vb->state == VB2_BUF_STATE_DEQUEUED) | |
2030 | return; | |
2031 | ||
2032 | vb->state = VB2_BUF_STATE_DEQUEUED; | |
2033 | ||
2034 | /* unmap DMABUF buffer */ | |
2035 | if (q->memory == V4L2_MEMORY_DMABUF) | |
2036 | for (i = 0; i < vb->num_planes; ++i) { | |
2037 | if (!vb->planes[i].dbuf_mapped) | |
2038 | continue; | |
a1d36d8c | 2039 | call_void_memop(vb, unmap_dmabuf, vb->planes[i].mem_priv); |
c5384048 SS |
2040 | vb->planes[i].dbuf_mapped = 0; |
2041 | } | |
2042 | } | |
2043 | ||
b2f2f047 | 2044 | static int vb2_internal_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking) |
e23ccc0a PO |
2045 | { |
2046 | struct vb2_buffer *vb = NULL; | |
2047 | int ret; | |
2048 | ||
2049 | if (b->type != q->type) { | |
fd4354cf | 2050 | dprintk(1, "invalid buffer type\n"); |
e23ccc0a PO |
2051 | return -EINVAL; |
2052 | } | |
32a77260 HV |
2053 | ret = __vb2_get_done_vb(q, &vb, b, nonblocking); |
2054 | if (ret < 0) | |
e23ccc0a | 2055 | return ret; |
e23ccc0a | 2056 | |
e23ccc0a PO |
2057 | switch (vb->state) { |
2058 | case VB2_BUF_STATE_DONE: | |
3050040b | 2059 | dprintk(3, "returning done buffer\n"); |
e23ccc0a PO |
2060 | break; |
2061 | case VB2_BUF_STATE_ERROR: | |
3050040b | 2062 | dprintk(3, "returning done buffer with errors\n"); |
e23ccc0a PO |
2063 | break; |
2064 | default: | |
3050040b | 2065 | dprintk(1, "invalid buffer state\n"); |
e23ccc0a PO |
2066 | return -EINVAL; |
2067 | } | |
2068 | ||
a1d36d8c | 2069 | call_void_vb_qop(vb, buf_finish, vb); |
9cf3c31a | 2070 | |
e23ccc0a PO |
2071 | /* Fill buffer information for the userspace */ |
2072 | __fill_v4l2_buffer(vb, b); | |
2073 | /* Remove from videobuf queue */ | |
2074 | list_del(&vb->queued_entry); | |
b3379c62 | 2075 | q->queued_count--; |
c5384048 SS |
2076 | /* go back to dequeued state */ |
2077 | __vb2_dqbuf(vb); | |
e23ccc0a PO |
2078 | |
2079 | dprintk(1, "dqbuf of buffer %d, with state %d\n", | |
2080 | vb->v4l2_buf.index, vb->state); | |
2081 | ||
e23ccc0a PO |
2082 | return 0; |
2083 | } | |
b2f2f047 HV |
2084 | |
2085 | /** | |
2086 | * vb2_dqbuf() - Dequeue a buffer to the userspace | |
2087 | * @q: videobuf2 queue | |
2088 | * @b: buffer structure passed from userspace to vidioc_dqbuf handler | |
2089 | * in driver | |
2090 | * @nonblocking: if true, this call will not sleep waiting for a buffer if no | |
2091 | * buffers ready for dequeuing are present. Normally the driver | |
2092 | * would be passing (file->f_flags & O_NONBLOCK) here | |
2093 | * | |
2094 | * Should be called from vidioc_dqbuf ioctl handler of a driver. | |
2095 | * This function: | |
2096 | * 1) verifies the passed buffer, | |
2097 | * 2) calls buf_finish callback in the driver (if provided), in which | |
2098 | * driver can perform any additional operations that may be required before | |
2099 | * returning the buffer to userspace, such as cache sync, | |
2100 | * 3) the buffer struct members are filled with relevant information for | |
2101 | * the userspace. | |
2102 | * | |
2103 | * The return values from this function are intended to be directly returned | |
2104 | * from vidioc_dqbuf handler in driver. | |
2105 | */ | |
2106 | int vb2_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking) | |
2107 | { | |
74753cff | 2108 | if (vb2_fileio_is_active(q)) { |
fd4354cf | 2109 | dprintk(1, "file io in progress\n"); |
b2f2f047 HV |
2110 | return -EBUSY; |
2111 | } | |
2112 | return vb2_internal_dqbuf(q, b, nonblocking); | |
2113 | } | |
e23ccc0a PO |
2114 | EXPORT_SYMBOL_GPL(vb2_dqbuf); |
2115 | ||
bd323e28 MS |
2116 | /** |
2117 | * __vb2_queue_cancel() - cancel and stop (pause) streaming | |
2118 | * | |
2119 | * Removes all queued buffers from driver's queue and all buffers queued by | |
2120 | * userspace from videobuf's queue. Returns to state after reqbufs. | |
2121 | */ | |
2122 | static void __vb2_queue_cancel(struct vb2_queue *q) | |
2123 | { | |
2124 | unsigned int i; | |
2125 | ||
2126 | /* | |
2127 | * Tell driver to stop all transactions and release all queued | |
2128 | * buffers. | |
2129 | */ | |
b3379c62 | 2130 | if (q->start_streaming_called) |
e37559b2 | 2131 | call_void_qop(q, stop_streaming, q); |
b3379c62 | 2132 | |
23cd08c8 HV |
2133 | /* |
2134 | * If you see this warning, then the driver isn't cleaning up properly | |
2135 | * in stop_streaming(). See the stop_streaming() documentation in | |
2136 | * videobuf2-core.h for more information how buffers should be returned | |
2137 | * to vb2 in stop_streaming(). | |
2138 | */ | |
b3379c62 HV |
2139 | if (WARN_ON(atomic_read(&q->owned_by_drv_count))) { |
2140 | for (i = 0; i < q->num_buffers; ++i) | |
2141 | if (q->bufs[i]->state == VB2_BUF_STATE_ACTIVE) | |
2142 | vb2_buffer_done(q->bufs[i], VB2_BUF_STATE_ERROR); | |
2143 | /* Must be zero now */ | |
2144 | WARN_ON(atomic_read(&q->owned_by_drv_count)); | |
2145 | } | |
bd323e28 | 2146 | |
b646f0b7 LP |
2147 | q->streaming = 0; |
2148 | q->start_streaming_called = 0; | |
2149 | q->queued_count = 0; | |
4bb7267d | 2150 | q->error = 0; |
b646f0b7 | 2151 | |
bd323e28 MS |
2152 | /* |
2153 | * Remove all buffers from videobuf's list... | |
2154 | */ | |
2155 | INIT_LIST_HEAD(&q->queued_list); | |
2156 | /* | |
2157 | * ...and done list; userspace will not receive any buffers it | |
2158 | * has not already dequeued before initiating cancel. | |
2159 | */ | |
2160 | INIT_LIST_HEAD(&q->done_list); | |
6ea3b980 | 2161 | atomic_set(&q->owned_by_drv_count, 0); |
bd323e28 MS |
2162 | wake_up_all(&q->done_wq); |
2163 | ||
2164 | /* | |
2165 | * Reinitialize all buffers for next use. | |
9c0863b1 HV |
2166 | * Make sure to call buf_finish for any queued buffers. Normally |
2167 | * that's done in dqbuf, but that's not going to happen when we | |
2168 | * cancel the whole queue. Note: this code belongs here, not in | |
2169 | * __vb2_dqbuf() since in vb2_internal_dqbuf() there is a critical | |
2170 | * call to __fill_v4l2_buffer() after buf_finish(). That order can't | |
2171 | * be changed, so we can't move the buf_finish() to __vb2_dqbuf(). | |
bd323e28 | 2172 | */ |
9c0863b1 HV |
2173 | for (i = 0; i < q->num_buffers; ++i) { |
2174 | struct vb2_buffer *vb = q->bufs[i]; | |
2175 | ||
2176 | if (vb->state != VB2_BUF_STATE_DEQUEUED) { | |
2177 | vb->state = VB2_BUF_STATE_PREPARED; | |
a1d36d8c | 2178 | call_void_vb_qop(vb, buf_finish, vb); |
9c0863b1 HV |
2179 | } |
2180 | __vb2_dqbuf(vb); | |
2181 | } | |
bd323e28 MS |
2182 | } |
2183 | ||
b2f2f047 | 2184 | static int vb2_internal_streamon(struct vb2_queue *q, enum v4l2_buf_type type) |
e23ccc0a | 2185 | { |
5db2c3ba | 2186 | int ret; |
e23ccc0a PO |
2187 | |
2188 | if (type != q->type) { | |
fd4354cf | 2189 | dprintk(1, "invalid stream type\n"); |
e23ccc0a PO |
2190 | return -EINVAL; |
2191 | } | |
2192 | ||
2193 | if (q->streaming) { | |
fd4354cf | 2194 | dprintk(3, "already streaming\n"); |
f956035c | 2195 | return 0; |
e23ccc0a PO |
2196 | } |
2197 | ||
548df783 | 2198 | if (!q->num_buffers) { |
fd4354cf | 2199 | dprintk(1, "no buffers have been allocated\n"); |
548df783 RR |
2200 | return -EINVAL; |
2201 | } | |
2202 | ||
b3379c62 | 2203 | if (q->num_buffers < q->min_buffers_needed) { |
fd4354cf | 2204 | dprintk(1, "need at least %u allocated buffers\n", |
b3379c62 HV |
2205 | q->min_buffers_needed); |
2206 | return -EINVAL; | |
2207 | } | |
249f5a58 | 2208 | |
e23ccc0a | 2209 | /* |
b3379c62 HV |
2210 | * Tell driver to start streaming provided sufficient buffers |
2211 | * are available. | |
e23ccc0a | 2212 | */ |
b3379c62 HV |
2213 | if (q->queued_count >= q->min_buffers_needed) { |
2214 | ret = vb2_start_streaming(q); | |
2215 | if (ret) { | |
2216 | __vb2_queue_cancel(q); | |
2217 | return ret; | |
2218 | } | |
5db2c3ba PO |
2219 | } |
2220 | ||
2221 | q->streaming = 1; | |
e23ccc0a | 2222 | |
fd4354cf | 2223 | dprintk(3, "successful\n"); |
e23ccc0a PO |
2224 | return 0; |
2225 | } | |
e23ccc0a | 2226 | |
4bb7267d LP |
2227 | /** |
2228 | * vb2_queue_error() - signal a fatal error on the queue | |
2229 | * @q: videobuf2 queue | |
2230 | * | |
2231 | * Flag that a fatal unrecoverable error has occurred and wake up all processes | |
2232 | * waiting on the queue. Polling will now set POLLERR and queuing and dequeuing | |
2233 | * buffers will return -EIO. | |
2234 | * | |
2235 | * The error flag will be cleared when cancelling the queue, either from | |
2236 | * vb2_streamoff or vb2_queue_release. Drivers should thus not call this | |
2237 | * function before starting the stream, otherwise the error flag will remain set | |
2238 | * until the queue is released when closing the device node. | |
2239 | */ | |
2240 | void vb2_queue_error(struct vb2_queue *q) | |
2241 | { | |
2242 | q->error = 1; | |
2243 | ||
2244 | wake_up_all(&q->done_wq); | |
2245 | } | |
2246 | EXPORT_SYMBOL_GPL(vb2_queue_error); | |
2247 | ||
e23ccc0a | 2248 | /** |
b2f2f047 | 2249 | * vb2_streamon - start streaming |
e23ccc0a | 2250 | * @q: videobuf2 queue |
b2f2f047 | 2251 | * @type: type argument passed from userspace to vidioc_streamon handler |
e23ccc0a | 2252 | * |
b2f2f047 | 2253 | * Should be called from vidioc_streamon handler of a driver. |
e23ccc0a | 2254 | * This function: |
b2f2f047 HV |
2255 | * 1) verifies current state |
2256 | * 2) passes any previously queued buffers to the driver and starts streaming | |
e23ccc0a | 2257 | * |
e23ccc0a | 2258 | * The return values from this function are intended to be directly returned |
b2f2f047 | 2259 | * from vidioc_streamon handler in the driver. |
e23ccc0a | 2260 | */ |
b2f2f047 | 2261 | int vb2_streamon(struct vb2_queue *q, enum v4l2_buf_type type) |
e23ccc0a | 2262 | { |
74753cff | 2263 | if (vb2_fileio_is_active(q)) { |
fd4354cf | 2264 | dprintk(1, "file io in progress\n"); |
b25748fe MS |
2265 | return -EBUSY; |
2266 | } | |
b2f2f047 HV |
2267 | return vb2_internal_streamon(q, type); |
2268 | } | |
2269 | EXPORT_SYMBOL_GPL(vb2_streamon); | |
b25748fe | 2270 | |
b2f2f047 HV |
2271 | static int vb2_internal_streamoff(struct vb2_queue *q, enum v4l2_buf_type type) |
2272 | { | |
e23ccc0a | 2273 | if (type != q->type) { |
fd4354cf | 2274 | dprintk(1, "invalid stream type\n"); |
e23ccc0a PO |
2275 | return -EINVAL; |
2276 | } | |
2277 | ||
e23ccc0a PO |
2278 | /* |
2279 | * Cancel will pause streaming and remove all buffers from the driver | |
2280 | * and videobuf, effectively returning control over them to userspace. | |
3f1a9a33 HV |
2281 | * |
2282 | * Note that we do this even if q->streaming == 0: if you prepare or | |
2283 | * queue buffers, and then call streamoff without ever having called | |
2284 | * streamon, you would still expect those buffers to be returned to | |
2285 | * their normal dequeued state. | |
e23ccc0a PO |
2286 | */ |
2287 | __vb2_queue_cancel(q); | |
58d75f4b | 2288 | q->waiting_for_buffers = !V4L2_TYPE_IS_OUTPUT(q->type); |
e23ccc0a | 2289 | |
fd4354cf | 2290 | dprintk(3, "successful\n"); |
e23ccc0a PO |
2291 | return 0; |
2292 | } | |
b2f2f047 HV |
2293 | |
2294 | /** | |
2295 | * vb2_streamoff - stop streaming | |
2296 | * @q: videobuf2 queue | |
2297 | * @type: type argument passed from userspace to vidioc_streamoff handler | |
2298 | * | |
2299 | * Should be called from vidioc_streamoff handler of a driver. | |
2300 | * This function: | |
2301 | * 1) verifies current state, | |
2302 | * 2) stop streaming and dequeues any queued buffers, including those previously | |
2303 | * passed to the driver (after waiting for the driver to finish). | |
2304 | * | |
2305 | * This call can be used for pausing playback. | |
2306 | * The return values from this function are intended to be directly returned | |
2307 | * from vidioc_streamoff handler in the driver | |
2308 | */ | |
2309 | int vb2_streamoff(struct vb2_queue *q, enum v4l2_buf_type type) | |
2310 | { | |
74753cff | 2311 | if (vb2_fileio_is_active(q)) { |
fd4354cf | 2312 | dprintk(1, "file io in progress\n"); |
b2f2f047 HV |
2313 | return -EBUSY; |
2314 | } | |
2315 | return vb2_internal_streamoff(q, type); | |
2316 | } | |
e23ccc0a PO |
2317 | EXPORT_SYMBOL_GPL(vb2_streamoff); |
2318 | ||
2319 | /** | |
2320 | * __find_plane_by_offset() - find plane associated with the given offset off | |
2321 | */ | |
2322 | static int __find_plane_by_offset(struct vb2_queue *q, unsigned long off, | |
2323 | unsigned int *_buffer, unsigned int *_plane) | |
2324 | { | |
2325 | struct vb2_buffer *vb; | |
2326 | unsigned int buffer, plane; | |
2327 | ||
2328 | /* | |
2329 | * Go over all buffers and their planes, comparing the given offset | |
2330 | * with an offset assigned to each plane. If a match is found, | |
2331 | * return its buffer and plane numbers. | |
2332 | */ | |
2333 | for (buffer = 0; buffer < q->num_buffers; ++buffer) { | |
2334 | vb = q->bufs[buffer]; | |
2335 | ||
2336 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
2337 | if (vb->v4l2_planes[plane].m.mem_offset == off) { | |
2338 | *_buffer = buffer; | |
2339 | *_plane = plane; | |
2340 | return 0; | |
2341 | } | |
2342 | } | |
2343 | } | |
2344 | ||
2345 | return -EINVAL; | |
2346 | } | |
2347 | ||
83ae7c5a TS |
2348 | /** |
2349 | * vb2_expbuf() - Export a buffer as a file descriptor | |
2350 | * @q: videobuf2 queue | |
2351 | * @eb: export buffer structure passed from userspace to vidioc_expbuf | |
2352 | * handler in driver | |
2353 | * | |
2354 | * The return values from this function are intended to be directly returned | |
2355 | * from vidioc_expbuf handler in driver. | |
2356 | */ | |
2357 | int vb2_expbuf(struct vb2_queue *q, struct v4l2_exportbuffer *eb) | |
2358 | { | |
2359 | struct vb2_buffer *vb = NULL; | |
2360 | struct vb2_plane *vb_plane; | |
2361 | int ret; | |
2362 | struct dma_buf *dbuf; | |
2363 | ||
2364 | if (q->memory != V4L2_MEMORY_MMAP) { | |
3050040b | 2365 | dprintk(1, "queue is not currently set up for mmap\n"); |
83ae7c5a TS |
2366 | return -EINVAL; |
2367 | } | |
2368 | ||
2369 | if (!q->mem_ops->get_dmabuf) { | |
3050040b | 2370 | dprintk(1, "queue does not support DMA buffer exporting\n"); |
83ae7c5a TS |
2371 | return -EINVAL; |
2372 | } | |
2373 | ||
ea3aba84 | 2374 | if (eb->flags & ~(O_CLOEXEC | O_ACCMODE)) { |
3050040b | 2375 | dprintk(1, "queue does support only O_CLOEXEC and access mode flags\n"); |
83ae7c5a TS |
2376 | return -EINVAL; |
2377 | } | |
2378 | ||
2379 | if (eb->type != q->type) { | |
fd4354cf | 2380 | dprintk(1, "invalid buffer type\n"); |
83ae7c5a TS |
2381 | return -EINVAL; |
2382 | } | |
2383 | ||
2384 | if (eb->index >= q->num_buffers) { | |
2385 | dprintk(1, "buffer index out of range\n"); | |
2386 | return -EINVAL; | |
2387 | } | |
2388 | ||
2389 | vb = q->bufs[eb->index]; | |
2390 | ||
2391 | if (eb->plane >= vb->num_planes) { | |
2392 | dprintk(1, "buffer plane out of range\n"); | |
2393 | return -EINVAL; | |
2394 | } | |
2395 | ||
74753cff HV |
2396 | if (vb2_fileio_is_active(q)) { |
2397 | dprintk(1, "expbuf: file io in progress\n"); | |
2398 | return -EBUSY; | |
2399 | } | |
2400 | ||
83ae7c5a TS |
2401 | vb_plane = &vb->planes[eb->plane]; |
2402 | ||
a1d36d8c | 2403 | dbuf = call_ptr_memop(vb, get_dmabuf, vb_plane->mem_priv, eb->flags & O_ACCMODE); |
83ae7c5a | 2404 | if (IS_ERR_OR_NULL(dbuf)) { |
3050040b | 2405 | dprintk(1, "failed to export buffer %d, plane %d\n", |
83ae7c5a TS |
2406 | eb->index, eb->plane); |
2407 | return -EINVAL; | |
2408 | } | |
2409 | ||
ea3aba84 | 2410 | ret = dma_buf_fd(dbuf, eb->flags & ~O_ACCMODE); |
83ae7c5a TS |
2411 | if (ret < 0) { |
2412 | dprintk(3, "buffer %d, plane %d failed to export (%d)\n", | |
2413 | eb->index, eb->plane, ret); | |
2414 | dma_buf_put(dbuf); | |
2415 | return ret; | |
2416 | } | |
2417 | ||
2418 | dprintk(3, "buffer %d, plane %d exported as %d descriptor\n", | |
2419 | eb->index, eb->plane, ret); | |
2420 | eb->fd = ret; | |
2421 | ||
2422 | return 0; | |
2423 | } | |
2424 | EXPORT_SYMBOL_GPL(vb2_expbuf); | |
2425 | ||
e23ccc0a PO |
2426 | /** |
2427 | * vb2_mmap() - map video buffers into application address space | |
2428 | * @q: videobuf2 queue | |
2429 | * @vma: vma passed to the mmap file operation handler in the driver | |
2430 | * | |
2431 | * Should be called from mmap file operation handler of a driver. | |
2432 | * This function maps one plane of one of the available video buffers to | |
2433 | * userspace. To map whole video memory allocated on reqbufs, this function | |
2434 | * has to be called once per each plane per each buffer previously allocated. | |
2435 | * | |
2436 | * When the userspace application calls mmap, it passes to it an offset returned | |
2437 | * to it earlier by the means of vidioc_querybuf handler. That offset acts as | |
2438 | * a "cookie", which is then used to identify the plane to be mapped. | |
2439 | * This function finds a plane with a matching offset and a mapping is performed | |
2440 | * by the means of a provided memory operation. | |
2441 | * | |
2442 | * The return values from this function are intended to be directly returned | |
2443 | * from the mmap handler in driver. | |
2444 | */ | |
2445 | int vb2_mmap(struct vb2_queue *q, struct vm_area_struct *vma) | |
2446 | { | |
2447 | unsigned long off = vma->vm_pgoff << PAGE_SHIFT; | |
e23ccc0a | 2448 | struct vb2_buffer *vb; |
ce9c2244 | 2449 | unsigned int buffer = 0, plane = 0; |
e23ccc0a | 2450 | int ret; |
7f841459 | 2451 | unsigned long length; |
e23ccc0a PO |
2452 | |
2453 | if (q->memory != V4L2_MEMORY_MMAP) { | |
3050040b | 2454 | dprintk(1, "queue is not currently set up for mmap\n"); |
e23ccc0a PO |
2455 | return -EINVAL; |
2456 | } | |
2457 | ||
2458 | /* | |
2459 | * Check memory area access mode. | |
2460 | */ | |
2461 | if (!(vma->vm_flags & VM_SHARED)) { | |
3050040b | 2462 | dprintk(1, "invalid vma flags, VM_SHARED needed\n"); |
e23ccc0a PO |
2463 | return -EINVAL; |
2464 | } | |
2465 | if (V4L2_TYPE_IS_OUTPUT(q->type)) { | |
2466 | if (!(vma->vm_flags & VM_WRITE)) { | |
3050040b | 2467 | dprintk(1, "invalid vma flags, VM_WRITE needed\n"); |
e23ccc0a PO |
2468 | return -EINVAL; |
2469 | } | |
2470 | } else { | |
2471 | if (!(vma->vm_flags & VM_READ)) { | |
3050040b | 2472 | dprintk(1, "invalid vma flags, VM_READ needed\n"); |
e23ccc0a PO |
2473 | return -EINVAL; |
2474 | } | |
2475 | } | |
74753cff HV |
2476 | if (vb2_fileio_is_active(q)) { |
2477 | dprintk(1, "mmap: file io in progress\n"); | |
2478 | return -EBUSY; | |
2479 | } | |
e23ccc0a PO |
2480 | |
2481 | /* | |
2482 | * Find the plane corresponding to the offset passed by userspace. | |
2483 | */ | |
2484 | ret = __find_plane_by_offset(q, off, &buffer, &plane); | |
2485 | if (ret) | |
2486 | return ret; | |
2487 | ||
2488 | vb = q->bufs[buffer]; | |
e23ccc0a | 2489 | |
7f841459 MCC |
2490 | /* |
2491 | * MMAP requires page_aligned buffers. | |
2492 | * The buffer length was page_aligned at __vb2_buf_mem_alloc(), | |
2493 | * so, we need to do the same here. | |
2494 | */ | |
2495 | length = PAGE_ALIGN(vb->v4l2_planes[plane].length); | |
2496 | if (length < (vma->vm_end - vma->vm_start)) { | |
2497 | dprintk(1, | |
2498 | "MMAP invalid, as it would overflow buffer length\n"); | |
068a0df7 SWK |
2499 | return -EINVAL; |
2500 | } | |
2501 | ||
f035eb4e | 2502 | mutex_lock(&q->mmap_lock); |
b5b4541e | 2503 | ret = call_memop(vb, mmap, vb->planes[plane].mem_priv, vma); |
f035eb4e | 2504 | mutex_unlock(&q->mmap_lock); |
a1d36d8c | 2505 | if (ret) |
e23ccc0a PO |
2506 | return ret; |
2507 | ||
3050040b | 2508 | dprintk(3, "buffer %d, plane %d successfully mapped\n", buffer, plane); |
e23ccc0a PO |
2509 | return 0; |
2510 | } | |
2511 | EXPORT_SYMBOL_GPL(vb2_mmap); | |
2512 | ||
6f524ec1 SJ |
2513 | #ifndef CONFIG_MMU |
2514 | unsigned long vb2_get_unmapped_area(struct vb2_queue *q, | |
2515 | unsigned long addr, | |
2516 | unsigned long len, | |
2517 | unsigned long pgoff, | |
2518 | unsigned long flags) | |
2519 | { | |
2520 | unsigned long off = pgoff << PAGE_SHIFT; | |
2521 | struct vb2_buffer *vb; | |
2522 | unsigned int buffer, plane; | |
f035eb4e | 2523 | void *vaddr; |
6f524ec1 SJ |
2524 | int ret; |
2525 | ||
2526 | if (q->memory != V4L2_MEMORY_MMAP) { | |
3050040b | 2527 | dprintk(1, "queue is not currently set up for mmap\n"); |
6f524ec1 SJ |
2528 | return -EINVAL; |
2529 | } | |
2530 | ||
2531 | /* | |
2532 | * Find the plane corresponding to the offset passed by userspace. | |
2533 | */ | |
2534 | ret = __find_plane_by_offset(q, off, &buffer, &plane); | |
2535 | if (ret) | |
2536 | return ret; | |
2537 | ||
2538 | vb = q->bufs[buffer]; | |
2539 | ||
f035eb4e HV |
2540 | vaddr = vb2_plane_vaddr(vb, plane); |
2541 | return vaddr ? (unsigned long)vaddr : -EINVAL; | |
6f524ec1 SJ |
2542 | } |
2543 | EXPORT_SYMBOL_GPL(vb2_get_unmapped_area); | |
2544 | #endif | |
2545 | ||
b25748fe MS |
2546 | static int __vb2_init_fileio(struct vb2_queue *q, int read); |
2547 | static int __vb2_cleanup_fileio(struct vb2_queue *q); | |
e23ccc0a PO |
2548 | |
2549 | /** | |
2550 | * vb2_poll() - implements poll userspace operation | |
2551 | * @q: videobuf2 queue | |
2552 | * @file: file argument passed to the poll file operation handler | |
2553 | * @wait: wait argument passed to the poll file operation handler | |
2554 | * | |
2555 | * This function implements poll file operation handler for a driver. | |
2556 | * For CAPTURE queues, if a buffer is ready to be dequeued, the userspace will | |
2557 | * be informed that the file descriptor of a video device is available for | |
2558 | * reading. | |
2559 | * For OUTPUT queues, if a buffer is ready to be dequeued, the file descriptor | |
2560 | * will be reported as available for writing. | |
2561 | * | |
95213ceb HV |
2562 | * If the driver uses struct v4l2_fh, then vb2_poll() will also check for any |
2563 | * pending events. | |
2564 | * | |
e23ccc0a PO |
2565 | * The return values from this function are intended to be directly returned |
2566 | * from poll handler in driver. | |
2567 | */ | |
2568 | unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait) | |
2569 | { | |
95213ceb | 2570 | struct video_device *vfd = video_devdata(file); |
bf5c7cbb | 2571 | unsigned long req_events = poll_requested_events(wait); |
e23ccc0a | 2572 | struct vb2_buffer *vb = NULL; |
95213ceb HV |
2573 | unsigned int res = 0; |
2574 | unsigned long flags; | |
2575 | ||
2576 | if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) { | |
2577 | struct v4l2_fh *fh = file->private_data; | |
2578 | ||
2579 | if (v4l2_event_pending(fh)) | |
2580 | res = POLLPRI; | |
2581 | else if (req_events & POLLPRI) | |
2582 | poll_wait(file, &fh->wait, wait); | |
2583 | } | |
e23ccc0a | 2584 | |
cd13823f HV |
2585 | if (!V4L2_TYPE_IS_OUTPUT(q->type) && !(req_events & (POLLIN | POLLRDNORM))) |
2586 | return res; | |
2587 | if (V4L2_TYPE_IS_OUTPUT(q->type) && !(req_events & (POLLOUT | POLLWRNORM))) | |
2588 | return res; | |
2589 | ||
b25748fe | 2590 | /* |
4ffabdb3 | 2591 | * Start file I/O emulator only if streaming API has not been used yet. |
b25748fe | 2592 | */ |
74753cff | 2593 | if (q->num_buffers == 0 && !vb2_fileio_is_active(q)) { |
bf5c7cbb HV |
2594 | if (!V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_READ) && |
2595 | (req_events & (POLLIN | POLLRDNORM))) { | |
95213ceb HV |
2596 | if (__vb2_init_fileio(q, 1)) |
2597 | return res | POLLERR; | |
b25748fe | 2598 | } |
bf5c7cbb HV |
2599 | if (V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_WRITE) && |
2600 | (req_events & (POLLOUT | POLLWRNORM))) { | |
95213ceb HV |
2601 | if (__vb2_init_fileio(q, 0)) |
2602 | return res | POLLERR; | |
b25748fe MS |
2603 | /* |
2604 | * Write to OUTPUT queue can be done immediately. | |
2605 | */ | |
95213ceb | 2606 | return res | POLLOUT | POLLWRNORM; |
b25748fe MS |
2607 | } |
2608 | } | |
2609 | ||
e23ccc0a | 2610 | /* |
58d75f4b HV |
2611 | * There is nothing to wait for if the queue isn't streaming, or if the |
2612 | * error flag is set. | |
e23ccc0a | 2613 | */ |
58d75f4b HV |
2614 | if (!vb2_is_streaming(q) || q->error) |
2615 | return res | POLLERR; | |
2616 | /* | |
2617 | * For compatibility with vb1: if QBUF hasn't been called yet, then | |
2618 | * return POLLERR as well. This only affects capture queues, output | |
2619 | * queues will always initialize waiting_for_buffers to false. | |
2620 | */ | |
2621 | if (q->waiting_for_buffers) | |
95213ceb | 2622 | return res | POLLERR; |
e23ccc0a | 2623 | |
1612f20e HV |
2624 | /* |
2625 | * For output streams you can write as long as there are fewer buffers | |
2626 | * queued than there are buffers available. | |
2627 | */ | |
2628 | if (V4L2_TYPE_IS_OUTPUT(q->type) && q->queued_count < q->num_buffers) | |
2629 | return res | POLLOUT | POLLWRNORM; | |
2630 | ||
412cb87d SWK |
2631 | if (list_empty(&q->done_list)) |
2632 | poll_wait(file, &q->done_wq, wait); | |
e23ccc0a PO |
2633 | |
2634 | /* | |
2635 | * Take first buffer available for dequeuing. | |
2636 | */ | |
2637 | spin_lock_irqsave(&q->done_lock, flags); | |
2638 | if (!list_empty(&q->done_list)) | |
2639 | vb = list_first_entry(&q->done_list, struct vb2_buffer, | |
2640 | done_entry); | |
2641 | spin_unlock_irqrestore(&q->done_lock, flags); | |
2642 | ||
2643 | if (vb && (vb->state == VB2_BUF_STATE_DONE | |
2644 | || vb->state == VB2_BUF_STATE_ERROR)) { | |
95213ceb HV |
2645 | return (V4L2_TYPE_IS_OUTPUT(q->type)) ? |
2646 | res | POLLOUT | POLLWRNORM : | |
2647 | res | POLLIN | POLLRDNORM; | |
e23ccc0a | 2648 | } |
95213ceb | 2649 | return res; |
e23ccc0a PO |
2650 | } |
2651 | EXPORT_SYMBOL_GPL(vb2_poll); | |
2652 | ||
2653 | /** | |
2654 | * vb2_queue_init() - initialize a videobuf2 queue | |
2655 | * @q: videobuf2 queue; this structure should be allocated in driver | |
2656 | * | |
2657 | * The vb2_queue structure should be allocated by the driver. The driver is | |
2658 | * responsible of clearing it's content and setting initial values for some | |
2659 | * required entries before calling this function. | |
2660 | * q->ops, q->mem_ops, q->type and q->io_modes are mandatory. Please refer | |
2661 | * to the struct vb2_queue description in include/media/videobuf2-core.h | |
2662 | * for more information. | |
2663 | */ | |
2664 | int vb2_queue_init(struct vb2_queue *q) | |
2665 | { | |
896f38f5 EG |
2666 | /* |
2667 | * Sanity check | |
2668 | */ | |
2669 | if (WARN_ON(!q) || | |
2670 | WARN_ON(!q->ops) || | |
2671 | WARN_ON(!q->mem_ops) || | |
2672 | WARN_ON(!q->type) || | |
2673 | WARN_ON(!q->io_modes) || | |
2674 | WARN_ON(!q->ops->queue_setup) || | |
6aa69f99 | 2675 | WARN_ON(!q->ops->buf_queue) || |
872484ce SA |
2676 | WARN_ON(q->timestamp_flags & |
2677 | ~(V4L2_BUF_FLAG_TIMESTAMP_MASK | | |
2678 | V4L2_BUF_FLAG_TSTAMP_SRC_MASK))) | |
896f38f5 | 2679 | return -EINVAL; |
e23ccc0a | 2680 | |
6aa69f99 | 2681 | /* Warn that the driver should choose an appropriate timestamp type */ |
c57ff792 SA |
2682 | WARN_ON((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == |
2683 | V4L2_BUF_FLAG_TIMESTAMP_UNKNOWN); | |
6aa69f99 | 2684 | |
e23ccc0a PO |
2685 | INIT_LIST_HEAD(&q->queued_list); |
2686 | INIT_LIST_HEAD(&q->done_list); | |
2687 | spin_lock_init(&q->done_lock); | |
f035eb4e | 2688 | mutex_init(&q->mmap_lock); |
e23ccc0a PO |
2689 | init_waitqueue_head(&q->done_wq); |
2690 | ||
2691 | if (q->buf_struct_size == 0) | |
2692 | q->buf_struct_size = sizeof(struct vb2_buffer); | |
2693 | ||
2694 | return 0; | |
2695 | } | |
2696 | EXPORT_SYMBOL_GPL(vb2_queue_init); | |
2697 | ||
2698 | /** | |
2699 | * vb2_queue_release() - stop streaming, release the queue and free memory | |
2700 | * @q: videobuf2 queue | |
2701 | * | |
2702 | * This function stops streaming and performs necessary clean ups, including | |
2703 | * freeing video buffer memory. The driver is responsible for freeing | |
2704 | * the vb2_queue structure itself. | |
2705 | */ | |
2706 | void vb2_queue_release(struct vb2_queue *q) | |
2707 | { | |
b25748fe | 2708 | __vb2_cleanup_fileio(q); |
e23ccc0a | 2709 | __vb2_queue_cancel(q); |
f035eb4e | 2710 | mutex_lock(&q->mmap_lock); |
2d86401c | 2711 | __vb2_queue_free(q, q->num_buffers); |
f035eb4e | 2712 | mutex_unlock(&q->mmap_lock); |
e23ccc0a PO |
2713 | } |
2714 | EXPORT_SYMBOL_GPL(vb2_queue_release); | |
2715 | ||
b25748fe MS |
2716 | /** |
2717 | * struct vb2_fileio_buf - buffer context used by file io emulator | |
2718 | * | |
2719 | * vb2 provides a compatibility layer and emulator of file io (read and | |
2720 | * write) calls on top of streaming API. This structure is used for | |
2721 | * tracking context related to the buffers. | |
2722 | */ | |
2723 | struct vb2_fileio_buf { | |
2724 | void *vaddr; | |
2725 | unsigned int size; | |
2726 | unsigned int pos; | |
2727 | unsigned int queued:1; | |
2728 | }; | |
2729 | ||
2730 | /** | |
2731 | * struct vb2_fileio_data - queue context used by file io emulator | |
2732 | * | |
4e5a4d8a HV |
2733 | * @cur_index: the index of the buffer currently being read from or |
2734 | * written to. If equal to q->num_buffers then a new buffer | |
2735 | * must be dequeued. | |
2736 | * @initial_index: in the read() case all buffers are queued up immediately | |
2737 | * in __vb2_init_fileio() and __vb2_perform_fileio() just cycles | |
2738 | * buffers. However, in the write() case no buffers are initially | |
2739 | * queued, instead whenever a buffer is full it is queued up by | |
2740 | * __vb2_perform_fileio(). Only once all available buffers have | |
2741 | * been queued up will __vb2_perform_fileio() start to dequeue | |
2742 | * buffers. This means that initially __vb2_perform_fileio() | |
2743 | * needs to know what buffer index to use when it is queuing up | |
2744 | * the buffers for the first time. That initial index is stored | |
2745 | * in this field. Once it is equal to q->num_buffers all | |
2746 | * available buffers have been queued and __vb2_perform_fileio() | |
2747 | * should start the normal dequeue/queue cycle. | |
2748 | * | |
b25748fe MS |
2749 | * vb2 provides a compatibility layer and emulator of file io (read and |
2750 | * write) calls on top of streaming API. For proper operation it required | |
2751 | * this structure to save the driver state between each call of the read | |
2752 | * or write function. | |
2753 | */ | |
2754 | struct vb2_fileio_data { | |
2755 | struct v4l2_requestbuffers req; | |
7bb6edd3 | 2756 | struct v4l2_plane p; |
b25748fe MS |
2757 | struct v4l2_buffer b; |
2758 | struct vb2_fileio_buf bufs[VIDEO_MAX_FRAME]; | |
4e5a4d8a HV |
2759 | unsigned int cur_index; |
2760 | unsigned int initial_index; | |
b25748fe MS |
2761 | unsigned int q_count; |
2762 | unsigned int dq_count; | |
2763 | unsigned int flags; | |
2764 | }; | |
2765 | ||
2766 | /** | |
2767 | * __vb2_init_fileio() - initialize file io emulator | |
2768 | * @q: videobuf2 queue | |
2769 | * @read: mode selector (1 means read, 0 means write) | |
2770 | */ | |
2771 | static int __vb2_init_fileio(struct vb2_queue *q, int read) | |
2772 | { | |
2773 | struct vb2_fileio_data *fileio; | |
2774 | int i, ret; | |
2775 | unsigned int count = 0; | |
2776 | ||
2777 | /* | |
2778 | * Sanity check | |
2779 | */ | |
e4d25816 HV |
2780 | if (WARN_ON((read && !(q->io_modes & VB2_READ)) || |
2781 | (!read && !(q->io_modes & VB2_WRITE)))) | |
2782 | return -EINVAL; | |
b25748fe MS |
2783 | |
2784 | /* | |
2785 | * Check if device supports mapping buffers to kernel virtual space. | |
2786 | */ | |
2787 | if (!q->mem_ops->vaddr) | |
2788 | return -EBUSY; | |
2789 | ||
2790 | /* | |
2791 | * Check if streaming api has not been already activated. | |
2792 | */ | |
2793 | if (q->streaming || q->num_buffers > 0) | |
2794 | return -EBUSY; | |
2795 | ||
2796 | /* | |
2797 | * Start with count 1, driver can increase it in queue_setup() | |
2798 | */ | |
2799 | count = 1; | |
2800 | ||
2801 | dprintk(3, "setting up file io: mode %s, count %d, flags %08x\n", | |
2802 | (read) ? "read" : "write", count, q->io_flags); | |
2803 | ||
2804 | fileio = kzalloc(sizeof(struct vb2_fileio_data), GFP_KERNEL); | |
2805 | if (fileio == NULL) | |
2806 | return -ENOMEM; | |
2807 | ||
2808 | fileio->flags = q->io_flags; | |
2809 | ||
2810 | /* | |
2811 | * Request buffers and use MMAP type to force driver | |
2812 | * to allocate buffers by itself. | |
2813 | */ | |
2814 | fileio->req.count = count; | |
2815 | fileio->req.memory = V4L2_MEMORY_MMAP; | |
2816 | fileio->req.type = q->type; | |
74753cff HV |
2817 | q->fileio = fileio; |
2818 | ret = __reqbufs(q, &fileio->req); | |
b25748fe MS |
2819 | if (ret) |
2820 | goto err_kfree; | |
2821 | ||
2822 | /* | |
2823 | * Check if plane_count is correct | |
2824 | * (multiplane buffers are not supported). | |
2825 | */ | |
2826 | if (q->bufs[0]->num_planes != 1) { | |
b25748fe MS |
2827 | ret = -EBUSY; |
2828 | goto err_reqbufs; | |
2829 | } | |
2830 | ||
2831 | /* | |
2832 | * Get kernel address of each buffer. | |
2833 | */ | |
2834 | for (i = 0; i < q->num_buffers; i++) { | |
2835 | fileio->bufs[i].vaddr = vb2_plane_vaddr(q->bufs[i], 0); | |
5dd6946c WY |
2836 | if (fileio->bufs[i].vaddr == NULL) { |
2837 | ret = -EINVAL; | |
b25748fe | 2838 | goto err_reqbufs; |
5dd6946c | 2839 | } |
b25748fe MS |
2840 | fileio->bufs[i].size = vb2_plane_size(q->bufs[i], 0); |
2841 | } | |
2842 | ||
2843 | /* | |
2844 | * Read mode requires pre queuing of all buffers. | |
2845 | */ | |
2846 | if (read) { | |
7bb6edd3 HV |
2847 | bool is_multiplanar = V4L2_TYPE_IS_MULTIPLANAR(q->type); |
2848 | ||
b25748fe MS |
2849 | /* |
2850 | * Queue all buffers. | |
2851 | */ | |
2852 | for (i = 0; i < q->num_buffers; i++) { | |
2853 | struct v4l2_buffer *b = &fileio->b; | |
7bb6edd3 | 2854 | |
b25748fe MS |
2855 | memset(b, 0, sizeof(*b)); |
2856 | b->type = q->type; | |
7bb6edd3 HV |
2857 | if (is_multiplanar) { |
2858 | memset(&fileio->p, 0, sizeof(fileio->p)); | |
2859 | b->m.planes = &fileio->p; | |
2860 | b->length = 1; | |
2861 | } | |
b25748fe MS |
2862 | b->memory = q->memory; |
2863 | b->index = i; | |
74753cff | 2864 | ret = vb2_internal_qbuf(q, b); |
b25748fe MS |
2865 | if (ret) |
2866 | goto err_reqbufs; | |
2867 | fileio->bufs[i].queued = 1; | |
2868 | } | |
4e5a4d8a HV |
2869 | /* |
2870 | * All buffers have been queued, so mark that by setting | |
2871 | * initial_index to q->num_buffers | |
2872 | */ | |
2873 | fileio->initial_index = q->num_buffers; | |
2874 | fileio->cur_index = q->num_buffers; | |
b25748fe MS |
2875 | } |
2876 | ||
02f142ec HV |
2877 | /* |
2878 | * Start streaming. | |
2879 | */ | |
74753cff | 2880 | ret = vb2_internal_streamon(q, q->type); |
02f142ec HV |
2881 | if (ret) |
2882 | goto err_reqbufs; | |
2883 | ||
b25748fe MS |
2884 | return ret; |
2885 | ||
2886 | err_reqbufs: | |
a67e1722 | 2887 | fileio->req.count = 0; |
74753cff | 2888 | __reqbufs(q, &fileio->req); |
b25748fe MS |
2889 | |
2890 | err_kfree: | |
74753cff | 2891 | q->fileio = NULL; |
b25748fe MS |
2892 | kfree(fileio); |
2893 | return ret; | |
2894 | } | |
2895 | ||
2896 | /** | |
2897 | * __vb2_cleanup_fileio() - free resourced used by file io emulator | |
2898 | * @q: videobuf2 queue | |
2899 | */ | |
2900 | static int __vb2_cleanup_fileio(struct vb2_queue *q) | |
2901 | { | |
2902 | struct vb2_fileio_data *fileio = q->fileio; | |
2903 | ||
2904 | if (fileio) { | |
b2f2f047 | 2905 | vb2_internal_streamoff(q, q->type); |
b25748fe | 2906 | q->fileio = NULL; |
b25748fe MS |
2907 | fileio->req.count = 0; |
2908 | vb2_reqbufs(q, &fileio->req); | |
2909 | kfree(fileio); | |
2910 | dprintk(3, "file io emulator closed\n"); | |
2911 | } | |
2912 | return 0; | |
2913 | } | |
2914 | ||
2915 | /** | |
2916 | * __vb2_perform_fileio() - perform a single file io (read or write) operation | |
2917 | * @q: videobuf2 queue | |
2918 | * @data: pointed to target userspace buffer | |
2919 | * @count: number of bytes to read or write | |
2920 | * @ppos: file handle position tracking pointer | |
2921 | * @nonblock: mode selector (1 means blocking calls, 0 means nonblocking) | |
2922 | * @read: access mode selector (1 means read, 0 means write) | |
2923 | */ | |
2924 | static size_t __vb2_perform_fileio(struct vb2_queue *q, char __user *data, size_t count, | |
2925 | loff_t *ppos, int nonblock, int read) | |
2926 | { | |
2927 | struct vb2_fileio_data *fileio; | |
2928 | struct vb2_fileio_buf *buf; | |
7bb6edd3 | 2929 | bool is_multiplanar = V4L2_TYPE_IS_MULTIPLANAR(q->type); |
ebd7c505 HV |
2930 | /* |
2931 | * When using write() to write data to an output video node the vb2 core | |
2932 | * should set timestamps if V4L2_BUF_FLAG_TIMESTAMP_COPY is set. Nobody | |
2933 | * else is able to provide this information with the write() operation. | |
2934 | */ | |
2935 | bool set_timestamp = !read && | |
2936 | (q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == | |
2937 | V4L2_BUF_FLAG_TIMESTAMP_COPY; | |
b25748fe MS |
2938 | int ret, index; |
2939 | ||
fd4354cf | 2940 | dprintk(3, "mode %s, offset %ld, count %zd, %sblocking\n", |
b25748fe MS |
2941 | read ? "read" : "write", (long)*ppos, count, |
2942 | nonblock ? "non" : ""); | |
2943 | ||
2944 | if (!data) | |
2945 | return -EINVAL; | |
2946 | ||
2947 | /* | |
2948 | * Initialize emulator on first call. | |
2949 | */ | |
74753cff | 2950 | if (!vb2_fileio_is_active(q)) { |
b25748fe | 2951 | ret = __vb2_init_fileio(q, read); |
fd4354cf | 2952 | dprintk(3, "vb2_init_fileio result: %d\n", ret); |
b25748fe MS |
2953 | if (ret) |
2954 | return ret; | |
2955 | } | |
2956 | fileio = q->fileio; | |
2957 | ||
b25748fe MS |
2958 | /* |
2959 | * Check if we need to dequeue the buffer. | |
2960 | */ | |
4e5a4d8a | 2961 | index = fileio->cur_index; |
88e26870 | 2962 | if (index >= q->num_buffers) { |
b25748fe MS |
2963 | /* |
2964 | * Call vb2_dqbuf to get buffer back. | |
2965 | */ | |
2966 | memset(&fileio->b, 0, sizeof(fileio->b)); | |
2967 | fileio->b.type = q->type; | |
2968 | fileio->b.memory = q->memory; | |
7bb6edd3 HV |
2969 | if (is_multiplanar) { |
2970 | memset(&fileio->p, 0, sizeof(fileio->p)); | |
2971 | fileio->b.m.planes = &fileio->p; | |
2972 | fileio->b.length = 1; | |
2973 | } | |
b2f2f047 | 2974 | ret = vb2_internal_dqbuf(q, &fileio->b, nonblock); |
fd4354cf | 2975 | dprintk(5, "vb2_dqbuf result: %d\n", ret); |
b25748fe | 2976 | if (ret) |
b2f2f047 | 2977 | return ret; |
b25748fe MS |
2978 | fileio->dq_count += 1; |
2979 | ||
4e5a4d8a | 2980 | fileio->cur_index = index = fileio->b.index; |
88e26870 HV |
2981 | buf = &fileio->bufs[index]; |
2982 | ||
b25748fe MS |
2983 | /* |
2984 | * Get number of bytes filled by the driver | |
2985 | */ | |
88e26870 | 2986 | buf->pos = 0; |
b25748fe | 2987 | buf->queued = 0; |
88e26870 HV |
2988 | buf->size = read ? vb2_get_plane_payload(q->bufs[index], 0) |
2989 | : vb2_plane_size(q->bufs[index], 0); | |
529a53c6 HV |
2990 | /* Compensate for data_offset on read in the multiplanar case. */ |
2991 | if (is_multiplanar && read && | |
2992 | fileio->b.m.planes[0].data_offset < buf->size) { | |
2993 | buf->pos = fileio->b.m.planes[0].data_offset; | |
2994 | buf->size -= buf->pos; | |
2995 | } | |
88e26870 HV |
2996 | } else { |
2997 | buf = &fileio->bufs[index]; | |
b25748fe MS |
2998 | } |
2999 | ||
3000 | /* | |
3001 | * Limit count on last few bytes of the buffer. | |
3002 | */ | |
3003 | if (buf->pos + count > buf->size) { | |
3004 | count = buf->size - buf->pos; | |
08b99e26 | 3005 | dprintk(5, "reducing read count: %zd\n", count); |
b25748fe MS |
3006 | } |
3007 | ||
3008 | /* | |
3009 | * Transfer data to userspace. | |
3010 | */ | |
fd4354cf | 3011 | dprintk(3, "copying %zd bytes - buffer %d, offset %u\n", |
b25748fe MS |
3012 | count, index, buf->pos); |
3013 | if (read) | |
3014 | ret = copy_to_user(data, buf->vaddr + buf->pos, count); | |
3015 | else | |
3016 | ret = copy_from_user(buf->vaddr + buf->pos, data, count); | |
3017 | if (ret) { | |
fd4354cf | 3018 | dprintk(3, "error copying data\n"); |
b2f2f047 | 3019 | return -EFAULT; |
b25748fe MS |
3020 | } |
3021 | ||
3022 | /* | |
3023 | * Update counters. | |
3024 | */ | |
3025 | buf->pos += count; | |
3026 | *ppos += count; | |
3027 | ||
3028 | /* | |
3029 | * Queue next buffer if required. | |
3030 | */ | |
3031 | if (buf->pos == buf->size || | |
3032 | (!read && (fileio->flags & VB2_FILEIO_WRITE_IMMEDIATELY))) { | |
3033 | /* | |
3034 | * Check if this is the last buffer to read. | |
3035 | */ | |
3036 | if (read && (fileio->flags & VB2_FILEIO_READ_ONCE) && | |
3037 | fileio->dq_count == 1) { | |
fd4354cf | 3038 | dprintk(3, "read limit reached\n"); |
b25748fe MS |
3039 | return __vb2_cleanup_fileio(q); |
3040 | } | |
3041 | ||
3042 | /* | |
3043 | * Call vb2_qbuf and give buffer to the driver. | |
3044 | */ | |
3045 | memset(&fileio->b, 0, sizeof(fileio->b)); | |
3046 | fileio->b.type = q->type; | |
3047 | fileio->b.memory = q->memory; | |
3048 | fileio->b.index = index; | |
3049 | fileio->b.bytesused = buf->pos; | |
7bb6edd3 HV |
3050 | if (is_multiplanar) { |
3051 | memset(&fileio->p, 0, sizeof(fileio->p)); | |
3052 | fileio->p.bytesused = buf->pos; | |
3053 | fileio->b.m.planes = &fileio->p; | |
3054 | fileio->b.length = 1; | |
3055 | } | |
ebd7c505 HV |
3056 | if (set_timestamp) |
3057 | v4l2_get_timestamp(&fileio->b.timestamp); | |
b2f2f047 | 3058 | ret = vb2_internal_qbuf(q, &fileio->b); |
fd4354cf | 3059 | dprintk(5, "vb2_dbuf result: %d\n", ret); |
b25748fe | 3060 | if (ret) |
b2f2f047 | 3061 | return ret; |
b25748fe MS |
3062 | |
3063 | /* | |
3064 | * Buffer has been queued, update the status | |
3065 | */ | |
3066 | buf->pos = 0; | |
3067 | buf->queued = 1; | |
88e26870 | 3068 | buf->size = vb2_plane_size(q->bufs[index], 0); |
b25748fe | 3069 | fileio->q_count += 1; |
4e5a4d8a HV |
3070 | /* |
3071 | * If we are queuing up buffers for the first time, then | |
3072 | * increase initial_index by one. | |
3073 | */ | |
3074 | if (fileio->initial_index < q->num_buffers) | |
3075 | fileio->initial_index++; | |
3076 | /* | |
3077 | * The next buffer to use is either a buffer that's going to be | |
3078 | * queued for the first time (initial_index < q->num_buffers) | |
3079 | * or it is equal to q->num_buffers, meaning that the next | |
3080 | * time we need to dequeue a buffer since we've now queued up | |
3081 | * all the 'first time' buffers. | |
3082 | */ | |
3083 | fileio->cur_index = fileio->initial_index; | |
b25748fe MS |
3084 | } |
3085 | ||
3086 | /* | |
3087 | * Return proper number of bytes processed. | |
3088 | */ | |
3089 | if (ret == 0) | |
3090 | ret = count; | |
b25748fe MS |
3091 | return ret; |
3092 | } | |
3093 | ||
3094 | size_t vb2_read(struct vb2_queue *q, char __user *data, size_t count, | |
3095 | loff_t *ppos, int nonblocking) | |
3096 | { | |
3097 | return __vb2_perform_fileio(q, data, count, ppos, nonblocking, 1); | |
3098 | } | |
3099 | EXPORT_SYMBOL_GPL(vb2_read); | |
3100 | ||
819585bc | 3101 | size_t vb2_write(struct vb2_queue *q, const char __user *data, size_t count, |
b25748fe MS |
3102 | loff_t *ppos, int nonblocking) |
3103 | { | |
819585bc RR |
3104 | return __vb2_perform_fileio(q, (char __user *) data, count, |
3105 | ppos, nonblocking, 0); | |
b25748fe MS |
3106 | } |
3107 | EXPORT_SYMBOL_GPL(vb2_write); | |
3108 | ||
3415a89f HV |
3109 | struct vb2_threadio_data { |
3110 | struct task_struct *thread; | |
3111 | vb2_thread_fnc fnc; | |
3112 | void *priv; | |
3113 | bool stop; | |
3114 | }; | |
3115 | ||
3116 | static int vb2_thread(void *data) | |
3117 | { | |
3118 | struct vb2_queue *q = data; | |
3119 | struct vb2_threadio_data *threadio = q->threadio; | |
3120 | struct vb2_fileio_data *fileio = q->fileio; | |
3121 | bool set_timestamp = false; | |
3122 | int prequeue = 0; | |
3123 | int index = 0; | |
3124 | int ret = 0; | |
3125 | ||
3126 | if (V4L2_TYPE_IS_OUTPUT(q->type)) { | |
3127 | prequeue = q->num_buffers; | |
3128 | set_timestamp = | |
3129 | (q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == | |
3130 | V4L2_BUF_FLAG_TIMESTAMP_COPY; | |
3131 | } | |
3132 | ||
3133 | set_freezable(); | |
3134 | ||
3135 | for (;;) { | |
3136 | struct vb2_buffer *vb; | |
3137 | ||
3138 | /* | |
3139 | * Call vb2_dqbuf to get buffer back. | |
3140 | */ | |
3141 | memset(&fileio->b, 0, sizeof(fileio->b)); | |
3142 | fileio->b.type = q->type; | |
3143 | fileio->b.memory = q->memory; | |
3144 | if (prequeue) { | |
3145 | fileio->b.index = index++; | |
3146 | prequeue--; | |
3147 | } else { | |
3148 | call_void_qop(q, wait_finish, q); | |
3149 | ret = vb2_internal_dqbuf(q, &fileio->b, 0); | |
3150 | call_void_qop(q, wait_prepare, q); | |
3151 | dprintk(5, "file io: vb2_dqbuf result: %d\n", ret); | |
3152 | } | |
3153 | if (threadio->stop) | |
3154 | break; | |
3155 | if (ret) | |
3156 | break; | |
3157 | try_to_freeze(); | |
3158 | ||
3159 | vb = q->bufs[fileio->b.index]; | |
3160 | if (!(fileio->b.flags & V4L2_BUF_FLAG_ERROR)) | |
3161 | ret = threadio->fnc(vb, threadio->priv); | |
3162 | if (ret) | |
3163 | break; | |
3164 | call_void_qop(q, wait_finish, q); | |
3165 | if (set_timestamp) | |
3166 | v4l2_get_timestamp(&fileio->b.timestamp); | |
3167 | ret = vb2_internal_qbuf(q, &fileio->b); | |
3168 | call_void_qop(q, wait_prepare, q); | |
3169 | if (ret) | |
3170 | break; | |
3171 | } | |
3172 | ||
3173 | /* Hmm, linux becomes *very* unhappy without this ... */ | |
3174 | while (!kthread_should_stop()) { | |
3175 | set_current_state(TASK_INTERRUPTIBLE); | |
3176 | schedule(); | |
3177 | } | |
3178 | return 0; | |
3179 | } | |
3180 | ||
3181 | /* | |
3182 | * This function should not be used for anything else but the videobuf2-dvb | |
3183 | * support. If you think you have another good use-case for this, then please | |
3184 | * contact the linux-media mailinglist first. | |
3185 | */ | |
3186 | int vb2_thread_start(struct vb2_queue *q, vb2_thread_fnc fnc, void *priv, | |
3187 | const char *thread_name) | |
3188 | { | |
3189 | struct vb2_threadio_data *threadio; | |
3190 | int ret = 0; | |
3191 | ||
3192 | if (q->threadio) | |
3193 | return -EBUSY; | |
3194 | if (vb2_is_busy(q)) | |
3195 | return -EBUSY; | |
3196 | if (WARN_ON(q->fileio)) | |
3197 | return -EBUSY; | |
3198 | ||
3199 | threadio = kzalloc(sizeof(*threadio), GFP_KERNEL); | |
3200 | if (threadio == NULL) | |
3201 | return -ENOMEM; | |
3202 | threadio->fnc = fnc; | |
3203 | threadio->priv = priv; | |
3204 | ||
3205 | ret = __vb2_init_fileio(q, !V4L2_TYPE_IS_OUTPUT(q->type)); | |
3206 | dprintk(3, "file io: vb2_init_fileio result: %d\n", ret); | |
3207 | if (ret) | |
3208 | goto nomem; | |
3209 | q->threadio = threadio; | |
3210 | threadio->thread = kthread_run(vb2_thread, q, "vb2-%s", thread_name); | |
3211 | if (IS_ERR(threadio->thread)) { | |
3212 | ret = PTR_ERR(threadio->thread); | |
3213 | threadio->thread = NULL; | |
3214 | goto nothread; | |
3215 | } | |
3216 | return 0; | |
3217 | ||
3218 | nothread: | |
3219 | __vb2_cleanup_fileio(q); | |
3220 | nomem: | |
3221 | kfree(threadio); | |
3222 | return ret; | |
3223 | } | |
3224 | EXPORT_SYMBOL_GPL(vb2_thread_start); | |
3225 | ||
3226 | int vb2_thread_stop(struct vb2_queue *q) | |
3227 | { | |
3228 | struct vb2_threadio_data *threadio = q->threadio; | |
3229 | struct vb2_fileio_data *fileio = q->fileio; | |
3230 | int err; | |
3231 | ||
3232 | if (threadio == NULL) | |
3233 | return 0; | |
3234 | call_void_qop(q, wait_finish, q); | |
3235 | threadio->stop = true; | |
3236 | vb2_internal_streamoff(q, q->type); | |
3237 | call_void_qop(q, wait_prepare, q); | |
3238 | q->fileio = NULL; | |
3239 | fileio->req.count = 0; | |
3240 | vb2_reqbufs(q, &fileio->req); | |
3241 | kfree(fileio); | |
3242 | err = kthread_stop(threadio->thread); | |
3243 | threadio->thread = NULL; | |
3244 | kfree(threadio); | |
3245 | q->fileio = NULL; | |
3246 | q->threadio = NULL; | |
3247 | return err; | |
3248 | } | |
3249 | EXPORT_SYMBOL_GPL(vb2_thread_stop); | |
4c1ffcaa HV |
3250 | |
3251 | /* | |
3252 | * The following functions are not part of the vb2 core API, but are helper | |
3253 | * functions that plug into struct v4l2_ioctl_ops, struct v4l2_file_operations | |
3254 | * and struct vb2_ops. | |
3255 | * They contain boilerplate code that most if not all drivers have to do | |
3256 | * and so they simplify the driver code. | |
3257 | */ | |
3258 | ||
3259 | /* The queue is busy if there is a owner and you are not that owner. */ | |
3260 | static inline bool vb2_queue_is_busy(struct video_device *vdev, struct file *file) | |
3261 | { | |
3262 | return vdev->queue->owner && vdev->queue->owner != file->private_data; | |
3263 | } | |
3264 | ||
3265 | /* vb2 ioctl helpers */ | |
3266 | ||
3267 | int vb2_ioctl_reqbufs(struct file *file, void *priv, | |
3268 | struct v4l2_requestbuffers *p) | |
3269 | { | |
3270 | struct video_device *vdev = video_devdata(file); | |
3271 | int res = __verify_memory_type(vdev->queue, p->memory, p->type); | |
3272 | ||
3273 | if (res) | |
3274 | return res; | |
3275 | if (vb2_queue_is_busy(vdev, file)) | |
3276 | return -EBUSY; | |
3277 | res = __reqbufs(vdev->queue, p); | |
3278 | /* If count == 0, then the owner has released all buffers and he | |
3279 | is no longer owner of the queue. Otherwise we have a new owner. */ | |
3280 | if (res == 0) | |
3281 | vdev->queue->owner = p->count ? file->private_data : NULL; | |
3282 | return res; | |
3283 | } | |
3284 | EXPORT_SYMBOL_GPL(vb2_ioctl_reqbufs); | |
3285 | ||
3286 | int vb2_ioctl_create_bufs(struct file *file, void *priv, | |
3287 | struct v4l2_create_buffers *p) | |
3288 | { | |
3289 | struct video_device *vdev = video_devdata(file); | |
3290 | int res = __verify_memory_type(vdev->queue, p->memory, p->format.type); | |
3291 | ||
3292 | p->index = vdev->queue->num_buffers; | |
3293 | /* If count == 0, then just check if memory and type are valid. | |
3294 | Any -EBUSY result from __verify_memory_type can be mapped to 0. */ | |
3295 | if (p->count == 0) | |
3296 | return res != -EBUSY ? res : 0; | |
3297 | if (res) | |
3298 | return res; | |
3299 | if (vb2_queue_is_busy(vdev, file)) | |
3300 | return -EBUSY; | |
3301 | res = __create_bufs(vdev->queue, p); | |
3302 | if (res == 0) | |
3303 | vdev->queue->owner = file->private_data; | |
3304 | return res; | |
3305 | } | |
3306 | EXPORT_SYMBOL_GPL(vb2_ioctl_create_bufs); | |
3307 | ||
3308 | int vb2_ioctl_prepare_buf(struct file *file, void *priv, | |
3309 | struct v4l2_buffer *p) | |
3310 | { | |
3311 | struct video_device *vdev = video_devdata(file); | |
3312 | ||
3313 | if (vb2_queue_is_busy(vdev, file)) | |
3314 | return -EBUSY; | |
3315 | return vb2_prepare_buf(vdev->queue, p); | |
3316 | } | |
3317 | EXPORT_SYMBOL_GPL(vb2_ioctl_prepare_buf); | |
3318 | ||
3319 | int vb2_ioctl_querybuf(struct file *file, void *priv, struct v4l2_buffer *p) | |
3320 | { | |
3321 | struct video_device *vdev = video_devdata(file); | |
3322 | ||
3323 | /* No need to call vb2_queue_is_busy(), anyone can query buffers. */ | |
3324 | return vb2_querybuf(vdev->queue, p); | |
3325 | } | |
3326 | EXPORT_SYMBOL_GPL(vb2_ioctl_querybuf); | |
3327 | ||
3328 | int vb2_ioctl_qbuf(struct file *file, void *priv, struct v4l2_buffer *p) | |
3329 | { | |
3330 | struct video_device *vdev = video_devdata(file); | |
3331 | ||
3332 | if (vb2_queue_is_busy(vdev, file)) | |
3333 | return -EBUSY; | |
3334 | return vb2_qbuf(vdev->queue, p); | |
3335 | } | |
3336 | EXPORT_SYMBOL_GPL(vb2_ioctl_qbuf); | |
3337 | ||
3338 | int vb2_ioctl_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p) | |
3339 | { | |
3340 | struct video_device *vdev = video_devdata(file); | |
3341 | ||
3342 | if (vb2_queue_is_busy(vdev, file)) | |
3343 | return -EBUSY; | |
3344 | return vb2_dqbuf(vdev->queue, p, file->f_flags & O_NONBLOCK); | |
3345 | } | |
3346 | EXPORT_SYMBOL_GPL(vb2_ioctl_dqbuf); | |
3347 | ||
3348 | int vb2_ioctl_streamon(struct file *file, void *priv, enum v4l2_buf_type i) | |
3349 | { | |
3350 | struct video_device *vdev = video_devdata(file); | |
3351 | ||
3352 | if (vb2_queue_is_busy(vdev, file)) | |
3353 | return -EBUSY; | |
3354 | return vb2_streamon(vdev->queue, i); | |
3355 | } | |
3356 | EXPORT_SYMBOL_GPL(vb2_ioctl_streamon); | |
3357 | ||
3358 | int vb2_ioctl_streamoff(struct file *file, void *priv, enum v4l2_buf_type i) | |
3359 | { | |
3360 | struct video_device *vdev = video_devdata(file); | |
3361 | ||
3362 | if (vb2_queue_is_busy(vdev, file)) | |
3363 | return -EBUSY; | |
3364 | return vb2_streamoff(vdev->queue, i); | |
3365 | } | |
3366 | EXPORT_SYMBOL_GPL(vb2_ioctl_streamoff); | |
3367 | ||
83ae7c5a TS |
3368 | int vb2_ioctl_expbuf(struct file *file, void *priv, struct v4l2_exportbuffer *p) |
3369 | { | |
3370 | struct video_device *vdev = video_devdata(file); | |
3371 | ||
3372 | if (vb2_queue_is_busy(vdev, file)) | |
3373 | return -EBUSY; | |
3374 | return vb2_expbuf(vdev->queue, p); | |
3375 | } | |
3376 | EXPORT_SYMBOL_GPL(vb2_ioctl_expbuf); | |
3377 | ||
4c1ffcaa HV |
3378 | /* v4l2_file_operations helpers */ |
3379 | ||
3380 | int vb2_fop_mmap(struct file *file, struct vm_area_struct *vma) | |
3381 | { | |
3382 | struct video_device *vdev = video_devdata(file); | |
3383 | ||
f035eb4e | 3384 | return vb2_mmap(vdev->queue, vma); |
4c1ffcaa HV |
3385 | } |
3386 | EXPORT_SYMBOL_GPL(vb2_fop_mmap); | |
3387 | ||
1380f575 | 3388 | int _vb2_fop_release(struct file *file, struct mutex *lock) |
4c1ffcaa HV |
3389 | { |
3390 | struct video_device *vdev = video_devdata(file); | |
3391 | ||
69c0e9c5 LP |
3392 | if (lock) |
3393 | mutex_lock(lock); | |
4c1ffcaa HV |
3394 | if (file->private_data == vdev->queue->owner) { |
3395 | vb2_queue_release(vdev->queue); | |
3396 | vdev->queue->owner = NULL; | |
3397 | } | |
69c0e9c5 LP |
3398 | if (lock) |
3399 | mutex_unlock(lock); | |
4c1ffcaa HV |
3400 | return v4l2_fh_release(file); |
3401 | } | |
1380f575 RR |
3402 | EXPORT_SYMBOL_GPL(_vb2_fop_release); |
3403 | ||
3404 | int vb2_fop_release(struct file *file) | |
3405 | { | |
3406 | struct video_device *vdev = video_devdata(file); | |
3407 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; | |
3408 | ||
3409 | return _vb2_fop_release(file, lock); | |
3410 | } | |
4c1ffcaa HV |
3411 | EXPORT_SYMBOL_GPL(vb2_fop_release); |
3412 | ||
819585bc | 3413 | ssize_t vb2_fop_write(struct file *file, const char __user *buf, |
4c1ffcaa HV |
3414 | size_t count, loff_t *ppos) |
3415 | { | |
3416 | struct video_device *vdev = video_devdata(file); | |
3417 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; | |
4c1ffcaa HV |
3418 | int err = -EBUSY; |
3419 | ||
cf533735 | 3420 | if (lock && mutex_lock_interruptible(lock)) |
4c1ffcaa HV |
3421 | return -ERESTARTSYS; |
3422 | if (vb2_queue_is_busy(vdev, file)) | |
3423 | goto exit; | |
3424 | err = vb2_write(vdev->queue, buf, count, ppos, | |
3425 | file->f_flags & O_NONBLOCK); | |
8c82c75c | 3426 | if (vdev->queue->fileio) |
4c1ffcaa HV |
3427 | vdev->queue->owner = file->private_data; |
3428 | exit: | |
cf533735 | 3429 | if (lock) |
4c1ffcaa HV |
3430 | mutex_unlock(lock); |
3431 | return err; | |
3432 | } | |
3433 | EXPORT_SYMBOL_GPL(vb2_fop_write); | |
3434 | ||
3435 | ssize_t vb2_fop_read(struct file *file, char __user *buf, | |
3436 | size_t count, loff_t *ppos) | |
3437 | { | |
3438 | struct video_device *vdev = video_devdata(file); | |
3439 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; | |
4c1ffcaa HV |
3440 | int err = -EBUSY; |
3441 | ||
cf533735 | 3442 | if (lock && mutex_lock_interruptible(lock)) |
4c1ffcaa HV |
3443 | return -ERESTARTSYS; |
3444 | if (vb2_queue_is_busy(vdev, file)) | |
3445 | goto exit; | |
3446 | err = vb2_read(vdev->queue, buf, count, ppos, | |
3447 | file->f_flags & O_NONBLOCK); | |
8c82c75c | 3448 | if (vdev->queue->fileio) |
4c1ffcaa HV |
3449 | vdev->queue->owner = file->private_data; |
3450 | exit: | |
cf533735 | 3451 | if (lock) |
4c1ffcaa HV |
3452 | mutex_unlock(lock); |
3453 | return err; | |
3454 | } | |
3455 | EXPORT_SYMBOL_GPL(vb2_fop_read); | |
3456 | ||
3457 | unsigned int vb2_fop_poll(struct file *file, poll_table *wait) | |
3458 | { | |
3459 | struct video_device *vdev = video_devdata(file); | |
3460 | struct vb2_queue *q = vdev->queue; | |
3461 | struct mutex *lock = q->lock ? q->lock : vdev->lock; | |
4c1ffcaa HV |
3462 | unsigned res; |
3463 | void *fileio; | |
4c1ffcaa | 3464 | |
f6cee188 LP |
3465 | /* |
3466 | * If this helper doesn't know how to lock, then you shouldn't be using | |
3467 | * it but you should write your own. | |
3468 | */ | |
3469 | WARN_ON(!lock); | |
4c1ffcaa | 3470 | |
f6cee188 | 3471 | if (lock && mutex_lock_interruptible(lock)) |
4c1ffcaa HV |
3472 | return POLLERR; |
3473 | ||
3474 | fileio = q->fileio; | |
3475 | ||
3476 | res = vb2_poll(vdev->queue, file, wait); | |
3477 | ||
3478 | /* If fileio was started, then we have a new queue owner. */ | |
f6cee188 | 3479 | if (!fileio && q->fileio) |
4c1ffcaa | 3480 | q->owner = file->private_data; |
f6cee188 | 3481 | if (lock) |
4c1ffcaa HV |
3482 | mutex_unlock(lock); |
3483 | return res; | |
3484 | } | |
3485 | EXPORT_SYMBOL_GPL(vb2_fop_poll); | |
3486 | ||
3487 | #ifndef CONFIG_MMU | |
3488 | unsigned long vb2_fop_get_unmapped_area(struct file *file, unsigned long addr, | |
3489 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
3490 | { | |
3491 | struct video_device *vdev = video_devdata(file); | |
3492 | ||
f035eb4e | 3493 | return vb2_get_unmapped_area(vdev->queue, addr, len, pgoff, flags); |
4c1ffcaa HV |
3494 | } |
3495 | EXPORT_SYMBOL_GPL(vb2_fop_get_unmapped_area); | |
3496 | #endif | |
3497 | ||
3498 | /* vb2_ops helpers. Only use if vq->lock is non-NULL. */ | |
3499 | ||
3500 | void vb2_ops_wait_prepare(struct vb2_queue *vq) | |
3501 | { | |
3502 | mutex_unlock(vq->lock); | |
3503 | } | |
3504 | EXPORT_SYMBOL_GPL(vb2_ops_wait_prepare); | |
3505 | ||
3506 | void vb2_ops_wait_finish(struct vb2_queue *vq) | |
3507 | { | |
3508 | mutex_lock(vq->lock); | |
3509 | } | |
3510 | EXPORT_SYMBOL_GPL(vb2_ops_wait_finish); | |
3511 | ||
e23ccc0a | 3512 | MODULE_DESCRIPTION("Driver helper framework for Video for Linux 2"); |
95072084 | 3513 | MODULE_AUTHOR("Pawel Osciak <pawel@osciak.com>, Marek Szyprowski"); |
e23ccc0a | 3514 | MODULE_LICENSE("GPL"); |