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 | 184 | static void __vb2_queue_cancel(struct vb2_queue *q); |
ce0eff01 | 185 | static void __enqueue_in_driver(struct vb2_buffer *vb); |
fb64dca8 | 186 | |
e23ccc0a PO |
187 | /** |
188 | * __vb2_buf_mem_alloc() - allocate video memory for the given buffer | |
189 | */ | |
c1426bc7 | 190 | static int __vb2_buf_mem_alloc(struct vb2_buffer *vb) |
e23ccc0a PO |
191 | { |
192 | struct vb2_queue *q = vb->vb2_queue; | |
d935c57e HV |
193 | enum dma_data_direction dma_dir = |
194 | V4L2_TYPE_IS_OUTPUT(q->type) ? DMA_TO_DEVICE : DMA_FROM_DEVICE; | |
e23ccc0a PO |
195 | void *mem_priv; |
196 | int plane; | |
197 | ||
7f841459 MCC |
198 | /* |
199 | * Allocate memory for all planes in this buffer | |
200 | * NOTE: mmapped areas should be page aligned | |
201 | */ | |
e23ccc0a | 202 | for (plane = 0; plane < vb->num_planes; ++plane) { |
7f841459 MCC |
203 | unsigned long size = PAGE_ALIGN(q->plane_sizes[plane]); |
204 | ||
a1d36d8c | 205 | mem_priv = call_ptr_memop(vb, alloc, q->alloc_ctx[plane], |
d935c57e | 206 | size, dma_dir, q->gfp_flags); |
62a79436 | 207 | if (IS_ERR_OR_NULL(mem_priv)) |
e23ccc0a PO |
208 | goto free; |
209 | ||
210 | /* Associate allocator private data with this plane */ | |
211 | vb->planes[plane].mem_priv = mem_priv; | |
c1426bc7 | 212 | vb->v4l2_planes[plane].length = q->plane_sizes[plane]; |
e23ccc0a PO |
213 | } |
214 | ||
215 | return 0; | |
216 | free: | |
217 | /* Free already allocated memory if one of the allocations failed */ | |
a00d0266 | 218 | for (; plane > 0; --plane) { |
a1d36d8c | 219 | call_void_memop(vb, put, vb->planes[plane - 1].mem_priv); |
a00d0266 MS |
220 | vb->planes[plane - 1].mem_priv = NULL; |
221 | } | |
e23ccc0a PO |
222 | |
223 | return -ENOMEM; | |
224 | } | |
225 | ||
226 | /** | |
227 | * __vb2_buf_mem_free() - free memory of the given buffer | |
228 | */ | |
229 | static void __vb2_buf_mem_free(struct vb2_buffer *vb) | |
230 | { | |
e23ccc0a PO |
231 | unsigned int plane; |
232 | ||
233 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
a1d36d8c | 234 | call_void_memop(vb, put, vb->planes[plane].mem_priv); |
e23ccc0a | 235 | vb->planes[plane].mem_priv = NULL; |
3050040b | 236 | dprintk(3, "freed plane %d of buffer %d\n", plane, |
a00d0266 | 237 | vb->v4l2_buf.index); |
e23ccc0a PO |
238 | } |
239 | } | |
240 | ||
241 | /** | |
242 | * __vb2_buf_userptr_put() - release userspace memory associated with | |
243 | * a USERPTR buffer | |
244 | */ | |
245 | static void __vb2_buf_userptr_put(struct vb2_buffer *vb) | |
246 | { | |
e23ccc0a PO |
247 | unsigned int plane; |
248 | ||
249 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
a00d0266 | 250 | if (vb->planes[plane].mem_priv) |
a1d36d8c | 251 | call_void_memop(vb, put_userptr, vb->planes[plane].mem_priv); |
a00d0266 | 252 | vb->planes[plane].mem_priv = NULL; |
e23ccc0a PO |
253 | } |
254 | } | |
255 | ||
c5384048 SS |
256 | /** |
257 | * __vb2_plane_dmabuf_put() - release memory associated with | |
258 | * a DMABUF shared plane | |
259 | */ | |
b5b4541e | 260 | static void __vb2_plane_dmabuf_put(struct vb2_buffer *vb, struct vb2_plane *p) |
c5384048 SS |
261 | { |
262 | if (!p->mem_priv) | |
263 | return; | |
264 | ||
265 | if (p->dbuf_mapped) | |
a1d36d8c | 266 | call_void_memop(vb, unmap_dmabuf, p->mem_priv); |
c5384048 | 267 | |
a1d36d8c | 268 | call_void_memop(vb, detach_dmabuf, p->mem_priv); |
c5384048 SS |
269 | dma_buf_put(p->dbuf); |
270 | memset(p, 0, sizeof(*p)); | |
271 | } | |
272 | ||
273 | /** | |
274 | * __vb2_buf_dmabuf_put() - release memory associated with | |
275 | * a DMABUF shared buffer | |
276 | */ | |
277 | static void __vb2_buf_dmabuf_put(struct vb2_buffer *vb) | |
278 | { | |
c5384048 SS |
279 | unsigned int plane; |
280 | ||
281 | for (plane = 0; plane < vb->num_planes; ++plane) | |
b5b4541e | 282 | __vb2_plane_dmabuf_put(vb, &vb->planes[plane]); |
c5384048 SS |
283 | } |
284 | ||
a5e3d743 HV |
285 | /** |
286 | * __setup_lengths() - setup initial lengths for every plane in | |
287 | * every buffer on the queue | |
288 | */ | |
289 | static void __setup_lengths(struct vb2_queue *q, unsigned int n) | |
290 | { | |
291 | unsigned int buffer, plane; | |
292 | struct vb2_buffer *vb; | |
293 | ||
294 | for (buffer = q->num_buffers; buffer < q->num_buffers + n; ++buffer) { | |
295 | vb = q->bufs[buffer]; | |
296 | if (!vb) | |
297 | continue; | |
298 | ||
299 | for (plane = 0; plane < vb->num_planes; ++plane) | |
300 | vb->v4l2_planes[plane].length = q->plane_sizes[plane]; | |
301 | } | |
302 | } | |
303 | ||
e23ccc0a PO |
304 | /** |
305 | * __setup_offsets() - setup unique offsets ("cookies") for every plane in | |
306 | * every buffer on the queue | |
307 | */ | |
2d86401c | 308 | static void __setup_offsets(struct vb2_queue *q, unsigned int n) |
e23ccc0a PO |
309 | { |
310 | unsigned int buffer, plane; | |
311 | struct vb2_buffer *vb; | |
2d86401c | 312 | unsigned long off; |
e23ccc0a | 313 | |
2d86401c GL |
314 | if (q->num_buffers) { |
315 | struct v4l2_plane *p; | |
316 | vb = q->bufs[q->num_buffers - 1]; | |
317 | p = &vb->v4l2_planes[vb->num_planes - 1]; | |
318 | off = PAGE_ALIGN(p->m.mem_offset + p->length); | |
319 | } else { | |
320 | off = 0; | |
321 | } | |
322 | ||
323 | for (buffer = q->num_buffers; buffer < q->num_buffers + n; ++buffer) { | |
e23ccc0a PO |
324 | vb = q->bufs[buffer]; |
325 | if (!vb) | |
326 | continue; | |
327 | ||
328 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
329 | vb->v4l2_planes[plane].m.mem_offset = off; | |
330 | ||
3050040b | 331 | dprintk(3, "buffer %d, plane %d offset 0x%08lx\n", |
e23ccc0a PO |
332 | buffer, plane, off); |
333 | ||
334 | off += vb->v4l2_planes[plane].length; | |
335 | off = PAGE_ALIGN(off); | |
336 | } | |
337 | } | |
338 | } | |
339 | ||
340 | /** | |
341 | * __vb2_queue_alloc() - allocate videobuf buffer structures and (for MMAP type) | |
342 | * video buffer memory for all buffers/planes on the queue and initializes the | |
343 | * queue | |
344 | * | |
345 | * Returns the number of buffers successfully allocated. | |
346 | */ | |
347 | static int __vb2_queue_alloc(struct vb2_queue *q, enum v4l2_memory memory, | |
c1426bc7 | 348 | unsigned int num_buffers, unsigned int num_planes) |
e23ccc0a PO |
349 | { |
350 | unsigned int buffer; | |
351 | struct vb2_buffer *vb; | |
352 | int ret; | |
353 | ||
354 | for (buffer = 0; buffer < num_buffers; ++buffer) { | |
355 | /* Allocate videobuf buffer structures */ | |
356 | vb = kzalloc(q->buf_struct_size, GFP_KERNEL); | |
357 | if (!vb) { | |
3050040b | 358 | dprintk(1, "memory alloc for buffer struct failed\n"); |
e23ccc0a PO |
359 | break; |
360 | } | |
361 | ||
362 | /* Length stores number of planes for multiplanar buffers */ | |
363 | if (V4L2_TYPE_IS_MULTIPLANAR(q->type)) | |
364 | vb->v4l2_buf.length = num_planes; | |
365 | ||
366 | vb->state = VB2_BUF_STATE_DEQUEUED; | |
367 | vb->vb2_queue = q; | |
368 | vb->num_planes = num_planes; | |
2d86401c | 369 | vb->v4l2_buf.index = q->num_buffers + buffer; |
e23ccc0a PO |
370 | vb->v4l2_buf.type = q->type; |
371 | vb->v4l2_buf.memory = memory; | |
372 | ||
373 | /* Allocate video buffer memory for the MMAP type */ | |
374 | if (memory == V4L2_MEMORY_MMAP) { | |
c1426bc7 | 375 | ret = __vb2_buf_mem_alloc(vb); |
e23ccc0a | 376 | if (ret) { |
3050040b | 377 | dprintk(1, "failed allocating memory for " |
e23ccc0a PO |
378 | "buffer %d\n", buffer); |
379 | kfree(vb); | |
380 | break; | |
381 | } | |
382 | /* | |
383 | * Call the driver-provided buffer initialization | |
384 | * callback, if given. An error in initialization | |
385 | * results in queue setup failure. | |
386 | */ | |
b5b4541e | 387 | ret = call_vb_qop(vb, buf_init, vb); |
e23ccc0a | 388 | if (ret) { |
3050040b | 389 | dprintk(1, "buffer %d %p initialization" |
e23ccc0a PO |
390 | " failed\n", buffer, vb); |
391 | __vb2_buf_mem_free(vb); | |
392 | kfree(vb); | |
393 | break; | |
394 | } | |
395 | } | |
396 | ||
2d86401c | 397 | q->bufs[q->num_buffers + buffer] = vb; |
e23ccc0a PO |
398 | } |
399 | ||
a5e3d743 | 400 | __setup_lengths(q, buffer); |
dc77523c PZ |
401 | if (memory == V4L2_MEMORY_MMAP) |
402 | __setup_offsets(q, buffer); | |
e23ccc0a | 403 | |
3050040b | 404 | dprintk(1, "allocated %d buffers, %d plane(s) each\n", |
2d86401c | 405 | buffer, num_planes); |
e23ccc0a PO |
406 | |
407 | return buffer; | |
408 | } | |
409 | ||
410 | /** | |
411 | * __vb2_free_mem() - release all video buffer memory for a given queue | |
412 | */ | |
2d86401c | 413 | static void __vb2_free_mem(struct vb2_queue *q, unsigned int buffers) |
e23ccc0a PO |
414 | { |
415 | unsigned int buffer; | |
416 | struct vb2_buffer *vb; | |
417 | ||
2d86401c GL |
418 | for (buffer = q->num_buffers - buffers; buffer < q->num_buffers; |
419 | ++buffer) { | |
e23ccc0a PO |
420 | vb = q->bufs[buffer]; |
421 | if (!vb) | |
422 | continue; | |
423 | ||
424 | /* Free MMAP buffers or release USERPTR buffers */ | |
425 | if (q->memory == V4L2_MEMORY_MMAP) | |
426 | __vb2_buf_mem_free(vb); | |
c5384048 SS |
427 | else if (q->memory == V4L2_MEMORY_DMABUF) |
428 | __vb2_buf_dmabuf_put(vb); | |
e23ccc0a PO |
429 | else |
430 | __vb2_buf_userptr_put(vb); | |
431 | } | |
432 | } | |
433 | ||
434 | /** | |
2d86401c GL |
435 | * __vb2_queue_free() - free buffers at the end of the queue - video memory and |
436 | * related information, if no buffers are left return the queue to an | |
437 | * uninitialized state. Might be called even if the queue has already been freed. | |
e23ccc0a | 438 | */ |
63faabfd | 439 | static int __vb2_queue_free(struct vb2_queue *q, unsigned int buffers) |
e23ccc0a PO |
440 | { |
441 | unsigned int buffer; | |
442 | ||
63faabfd HV |
443 | /* |
444 | * Sanity check: when preparing a buffer the queue lock is released for | |
445 | * a short while (see __buf_prepare for the details), which would allow | |
446 | * a race with a reqbufs which can call this function. Removing the | |
447 | * buffers from underneath __buf_prepare is obviously a bad idea, so we | |
448 | * check if any of the buffers is in the state PREPARING, and if so we | |
449 | * just return -EAGAIN. | |
450 | */ | |
451 | for (buffer = q->num_buffers - buffers; buffer < q->num_buffers; | |
452 | ++buffer) { | |
453 | if (q->bufs[buffer] == NULL) | |
454 | continue; | |
455 | if (q->bufs[buffer]->state == VB2_BUF_STATE_PREPARING) { | |
fd4354cf | 456 | dprintk(1, "preparing buffers, cannot free\n"); |
63faabfd HV |
457 | return -EAGAIN; |
458 | } | |
459 | } | |
460 | ||
e23ccc0a | 461 | /* Call driver-provided cleanup function for each buffer, if provided */ |
b5b4541e HV |
462 | for (buffer = q->num_buffers - buffers; buffer < q->num_buffers; |
463 | ++buffer) { | |
256f3162 HV |
464 | struct vb2_buffer *vb = q->bufs[buffer]; |
465 | ||
466 | if (vb && vb->planes[0].mem_priv) | |
a1d36d8c | 467 | call_void_vb_qop(vb, buf_cleanup, vb); |
e23ccc0a PO |
468 | } |
469 | ||
470 | /* Release video buffer memory */ | |
2d86401c | 471 | __vb2_free_mem(q, buffers); |
e23ccc0a | 472 | |
b5b4541e HV |
473 | #ifdef CONFIG_VIDEO_ADV_DEBUG |
474 | /* | |
475 | * Check that all the calls were balances during the life-time of this | |
476 | * queue. If not (or if the debug level is 1 or up), then dump the | |
477 | * counters to the kernel log. | |
478 | */ | |
479 | if (q->num_buffers) { | |
480 | bool unbalanced = q->cnt_start_streaming != q->cnt_stop_streaming || | |
481 | q->cnt_wait_prepare != q->cnt_wait_finish; | |
482 | ||
483 | if (unbalanced || debug) { | |
484 | pr_info("vb2: counters for queue %p:%s\n", q, | |
485 | unbalanced ? " UNBALANCED!" : ""); | |
486 | pr_info("vb2: setup: %u start_streaming: %u stop_streaming: %u\n", | |
487 | q->cnt_queue_setup, q->cnt_start_streaming, | |
488 | q->cnt_stop_streaming); | |
489 | pr_info("vb2: wait_prepare: %u wait_finish: %u\n", | |
490 | q->cnt_wait_prepare, q->cnt_wait_finish); | |
491 | } | |
492 | q->cnt_queue_setup = 0; | |
493 | q->cnt_wait_prepare = 0; | |
494 | q->cnt_wait_finish = 0; | |
495 | q->cnt_start_streaming = 0; | |
496 | q->cnt_stop_streaming = 0; | |
497 | } | |
498 | for (buffer = 0; buffer < q->num_buffers; ++buffer) { | |
499 | struct vb2_buffer *vb = q->bufs[buffer]; | |
500 | bool unbalanced = vb->cnt_mem_alloc != vb->cnt_mem_put || | |
501 | vb->cnt_mem_prepare != vb->cnt_mem_finish || | |
502 | vb->cnt_mem_get_userptr != vb->cnt_mem_put_userptr || | |
503 | vb->cnt_mem_attach_dmabuf != vb->cnt_mem_detach_dmabuf || | |
504 | vb->cnt_mem_map_dmabuf != vb->cnt_mem_unmap_dmabuf || | |
505 | vb->cnt_buf_queue != vb->cnt_buf_done || | |
506 | vb->cnt_buf_prepare != vb->cnt_buf_finish || | |
507 | vb->cnt_buf_init != vb->cnt_buf_cleanup; | |
508 | ||
509 | if (unbalanced || debug) { | |
510 | pr_info("vb2: counters for queue %p, buffer %d:%s\n", | |
511 | q, buffer, unbalanced ? " UNBALANCED!" : ""); | |
512 | pr_info("vb2: buf_init: %u buf_cleanup: %u buf_prepare: %u buf_finish: %u\n", | |
513 | vb->cnt_buf_init, vb->cnt_buf_cleanup, | |
514 | vb->cnt_buf_prepare, vb->cnt_buf_finish); | |
515 | pr_info("vb2: buf_queue: %u buf_done: %u\n", | |
516 | vb->cnt_buf_queue, vb->cnt_buf_done); | |
517 | pr_info("vb2: alloc: %u put: %u prepare: %u finish: %u mmap: %u\n", | |
518 | vb->cnt_mem_alloc, vb->cnt_mem_put, | |
519 | vb->cnt_mem_prepare, vb->cnt_mem_finish, | |
520 | vb->cnt_mem_mmap); | |
521 | pr_info("vb2: get_userptr: %u put_userptr: %u\n", | |
522 | vb->cnt_mem_get_userptr, vb->cnt_mem_put_userptr); | |
523 | pr_info("vb2: attach_dmabuf: %u detach_dmabuf: %u map_dmabuf: %u unmap_dmabuf: %u\n", | |
524 | vb->cnt_mem_attach_dmabuf, vb->cnt_mem_detach_dmabuf, | |
525 | vb->cnt_mem_map_dmabuf, vb->cnt_mem_unmap_dmabuf); | |
526 | pr_info("vb2: get_dmabuf: %u num_users: %u vaddr: %u cookie: %u\n", | |
527 | vb->cnt_mem_get_dmabuf, | |
528 | vb->cnt_mem_num_users, | |
529 | vb->cnt_mem_vaddr, | |
530 | vb->cnt_mem_cookie); | |
531 | } | |
532 | } | |
533 | #endif | |
534 | ||
e23ccc0a | 535 | /* Free videobuf buffers */ |
2d86401c GL |
536 | for (buffer = q->num_buffers - buffers; buffer < q->num_buffers; |
537 | ++buffer) { | |
e23ccc0a PO |
538 | kfree(q->bufs[buffer]); |
539 | q->bufs[buffer] = NULL; | |
540 | } | |
541 | ||
2d86401c | 542 | q->num_buffers -= buffers; |
a7afcacc | 543 | if (!q->num_buffers) { |
2d86401c | 544 | q->memory = 0; |
a7afcacc HV |
545 | INIT_LIST_HEAD(&q->queued_list); |
546 | } | |
63faabfd | 547 | return 0; |
e23ccc0a PO |
548 | } |
549 | ||
550 | /** | |
551 | * __verify_planes_array() - verify that the planes array passed in struct | |
552 | * v4l2_buffer from userspace can be safely used | |
553 | */ | |
2d86401c | 554 | static int __verify_planes_array(struct vb2_buffer *vb, const struct v4l2_buffer *b) |
e23ccc0a | 555 | { |
32a77260 HV |
556 | if (!V4L2_TYPE_IS_MULTIPLANAR(b->type)) |
557 | return 0; | |
558 | ||
e23ccc0a PO |
559 | /* Is memory for copying plane information present? */ |
560 | if (NULL == b->m.planes) { | |
3050040b | 561 | dprintk(1, "multi-planar buffer passed but " |
e23ccc0a PO |
562 | "planes array not provided\n"); |
563 | return -EINVAL; | |
564 | } | |
565 | ||
566 | if (b->length < vb->num_planes || b->length > VIDEO_MAX_PLANES) { | |
3050040b | 567 | dprintk(1, "incorrect planes array length, " |
e23ccc0a PO |
568 | "expected %d, got %d\n", vb->num_planes, b->length); |
569 | return -EINVAL; | |
570 | } | |
571 | ||
572 | return 0; | |
573 | } | |
574 | ||
8023ed09 LP |
575 | /** |
576 | * __verify_length() - Verify that the bytesused value for each plane fits in | |
577 | * the plane length and that the data offset doesn't exceed the bytesused value. | |
578 | */ | |
579 | static int __verify_length(struct vb2_buffer *vb, const struct v4l2_buffer *b) | |
580 | { | |
581 | unsigned int length; | |
8a75ffb8 | 582 | unsigned int bytesused; |
8023ed09 LP |
583 | unsigned int plane; |
584 | ||
585 | if (!V4L2_TYPE_IS_OUTPUT(b->type)) | |
586 | return 0; | |
587 | ||
588 | if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) { | |
589 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
8a75ffb8 HV |
590 | length = (b->memory == V4L2_MEMORY_USERPTR || |
591 | b->memory == V4L2_MEMORY_DMABUF) | |
8023ed09 LP |
592 | ? b->m.planes[plane].length |
593 | : vb->v4l2_planes[plane].length; | |
8a75ffb8 HV |
594 | bytesused = b->m.planes[plane].bytesused |
595 | ? b->m.planes[plane].bytesused : length; | |
8023ed09 LP |
596 | |
597 | if (b->m.planes[plane].bytesused > length) | |
598 | return -EINVAL; | |
3c5c23c5 SN |
599 | |
600 | if (b->m.planes[plane].data_offset > 0 && | |
8a75ffb8 | 601 | b->m.planes[plane].data_offset >= bytesused) |
8023ed09 LP |
602 | return -EINVAL; |
603 | } | |
604 | } else { | |
605 | length = (b->memory == V4L2_MEMORY_USERPTR) | |
606 | ? b->length : vb->v4l2_planes[0].length; | |
8a75ffb8 | 607 | bytesused = b->bytesused ? b->bytesused : length; |
8023ed09 LP |
608 | |
609 | if (b->bytesused > length) | |
610 | return -EINVAL; | |
611 | } | |
612 | ||
613 | return 0; | |
614 | } | |
615 | ||
25a27d91 MS |
616 | /** |
617 | * __buffer_in_use() - return true if the buffer is in use and | |
618 | * the queue cannot be freed (by the means of REQBUFS(0)) call | |
619 | */ | |
620 | static bool __buffer_in_use(struct vb2_queue *q, struct vb2_buffer *vb) | |
621 | { | |
622 | unsigned int plane; | |
623 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
2c2dd6ac | 624 | void *mem_priv = vb->planes[plane].mem_priv; |
25a27d91 MS |
625 | /* |
626 | * If num_users() has not been provided, call_memop | |
627 | * will return 0, apparently nobody cares about this | |
628 | * case anyway. If num_users() returns more than 1, | |
629 | * we are not the only user of the plane's memory. | |
630 | */ | |
b5b4541e | 631 | if (mem_priv && call_memop(vb, num_users, mem_priv) > 1) |
25a27d91 MS |
632 | return true; |
633 | } | |
634 | return false; | |
635 | } | |
636 | ||
637 | /** | |
638 | * __buffers_in_use() - return true if any buffers on the queue are in use and | |
639 | * the queue cannot be freed (by the means of REQBUFS(0)) call | |
640 | */ | |
641 | static bool __buffers_in_use(struct vb2_queue *q) | |
642 | { | |
643 | unsigned int buffer; | |
644 | for (buffer = 0; buffer < q->num_buffers; ++buffer) { | |
645 | if (__buffer_in_use(q, q->bufs[buffer])) | |
646 | return true; | |
647 | } | |
648 | return false; | |
649 | } | |
650 | ||
e23ccc0a PO |
651 | /** |
652 | * __fill_v4l2_buffer() - fill in a struct v4l2_buffer with information to be | |
653 | * returned to userspace | |
654 | */ | |
32a77260 | 655 | static void __fill_v4l2_buffer(struct vb2_buffer *vb, struct v4l2_buffer *b) |
e23ccc0a PO |
656 | { |
657 | struct vb2_queue *q = vb->vb2_queue; | |
e23ccc0a | 658 | |
2b719d7b | 659 | /* Copy back data such as timestamp, flags, etc. */ |
e23ccc0a | 660 | memcpy(b, &vb->v4l2_buf, offsetof(struct v4l2_buffer, m)); |
2b719d7b | 661 | b->reserved2 = vb->v4l2_buf.reserved2; |
e23ccc0a PO |
662 | b->reserved = vb->v4l2_buf.reserved; |
663 | ||
664 | if (V4L2_TYPE_IS_MULTIPLANAR(q->type)) { | |
e23ccc0a PO |
665 | /* |
666 | * Fill in plane-related data if userspace provided an array | |
32a77260 | 667 | * for it. The caller has already verified memory and size. |
e23ccc0a | 668 | */ |
3c0b6061 | 669 | b->length = vb->num_planes; |
e23ccc0a PO |
670 | memcpy(b->m.planes, vb->v4l2_planes, |
671 | b->length * sizeof(struct v4l2_plane)); | |
672 | } else { | |
673 | /* | |
674 | * We use length and offset in v4l2_planes array even for | |
675 | * single-planar buffers, but userspace does not. | |
676 | */ | |
677 | b->length = vb->v4l2_planes[0].length; | |
678 | b->bytesused = vb->v4l2_planes[0].bytesused; | |
679 | if (q->memory == V4L2_MEMORY_MMAP) | |
680 | b->m.offset = vb->v4l2_planes[0].m.mem_offset; | |
681 | else if (q->memory == V4L2_MEMORY_USERPTR) | |
682 | b->m.userptr = vb->v4l2_planes[0].m.userptr; | |
c5384048 SS |
683 | else if (q->memory == V4L2_MEMORY_DMABUF) |
684 | b->m.fd = vb->v4l2_planes[0].m.fd; | |
e23ccc0a PO |
685 | } |
686 | ||
ea42c8ec MS |
687 | /* |
688 | * Clear any buffer state related flags. | |
689 | */ | |
1b18e7a0 | 690 | b->flags &= ~V4L2_BUFFER_MASK_FLAGS; |
7ce6fd8f SA |
691 | b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK; |
692 | if ((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) != | |
693 | V4L2_BUF_FLAG_TIMESTAMP_COPY) { | |
694 | /* | |
695 | * For non-COPY timestamps, drop timestamp source bits | |
696 | * and obtain the timestamp source from the queue. | |
697 | */ | |
698 | b->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK; | |
699 | b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TSTAMP_SRC_MASK; | |
700 | } | |
e23ccc0a PO |
701 | |
702 | switch (vb->state) { | |
703 | case VB2_BUF_STATE_QUEUED: | |
704 | case VB2_BUF_STATE_ACTIVE: | |
705 | b->flags |= V4L2_BUF_FLAG_QUEUED; | |
706 | break; | |
707 | case VB2_BUF_STATE_ERROR: | |
708 | b->flags |= V4L2_BUF_FLAG_ERROR; | |
709 | /* fall through */ | |
710 | case VB2_BUF_STATE_DONE: | |
711 | b->flags |= V4L2_BUF_FLAG_DONE; | |
712 | break; | |
ebc087d0 | 713 | case VB2_BUF_STATE_PREPARED: |
2d86401c GL |
714 | b->flags |= V4L2_BUF_FLAG_PREPARED; |
715 | break; | |
b18a8ff2 | 716 | case VB2_BUF_STATE_PREPARING: |
2d86401c | 717 | case VB2_BUF_STATE_DEQUEUED: |
e23ccc0a PO |
718 | /* nothing */ |
719 | break; | |
720 | } | |
721 | ||
25a27d91 | 722 | if (__buffer_in_use(q, vb)) |
e23ccc0a | 723 | b->flags |= V4L2_BUF_FLAG_MAPPED; |
e23ccc0a PO |
724 | } |
725 | ||
726 | /** | |
727 | * vb2_querybuf() - query video buffer information | |
728 | * @q: videobuf queue | |
729 | * @b: buffer struct passed from userspace to vidioc_querybuf handler | |
730 | * in driver | |
731 | * | |
732 | * Should be called from vidioc_querybuf ioctl handler in driver. | |
733 | * This function will verify the passed v4l2_buffer structure and fill the | |
734 | * relevant information for the userspace. | |
735 | * | |
736 | * The return values from this function are intended to be directly returned | |
737 | * from vidioc_querybuf handler in driver. | |
738 | */ | |
739 | int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b) | |
740 | { | |
741 | struct vb2_buffer *vb; | |
32a77260 | 742 | int ret; |
e23ccc0a PO |
743 | |
744 | if (b->type != q->type) { | |
fd4354cf | 745 | dprintk(1, "wrong buffer type\n"); |
e23ccc0a PO |
746 | return -EINVAL; |
747 | } | |
748 | ||
749 | if (b->index >= q->num_buffers) { | |
fd4354cf | 750 | dprintk(1, "buffer index out of range\n"); |
e23ccc0a PO |
751 | return -EINVAL; |
752 | } | |
753 | vb = q->bufs[b->index]; | |
32a77260 HV |
754 | ret = __verify_planes_array(vb, b); |
755 | if (!ret) | |
756 | __fill_v4l2_buffer(vb, b); | |
757 | return ret; | |
e23ccc0a PO |
758 | } |
759 | EXPORT_SYMBOL(vb2_querybuf); | |
760 | ||
761 | /** | |
762 | * __verify_userptr_ops() - verify that all memory operations required for | |
763 | * USERPTR queue type have been provided | |
764 | */ | |
765 | static int __verify_userptr_ops(struct vb2_queue *q) | |
766 | { | |
767 | if (!(q->io_modes & VB2_USERPTR) || !q->mem_ops->get_userptr || | |
768 | !q->mem_ops->put_userptr) | |
769 | return -EINVAL; | |
770 | ||
771 | return 0; | |
772 | } | |
773 | ||
774 | /** | |
775 | * __verify_mmap_ops() - verify that all memory operations required for | |
776 | * MMAP queue type have been provided | |
777 | */ | |
778 | static int __verify_mmap_ops(struct vb2_queue *q) | |
779 | { | |
780 | if (!(q->io_modes & VB2_MMAP) || !q->mem_ops->alloc || | |
781 | !q->mem_ops->put || !q->mem_ops->mmap) | |
782 | return -EINVAL; | |
783 | ||
784 | return 0; | |
785 | } | |
786 | ||
c5384048 SS |
787 | /** |
788 | * __verify_dmabuf_ops() - verify that all memory operations required for | |
789 | * DMABUF queue type have been provided | |
790 | */ | |
791 | static int __verify_dmabuf_ops(struct vb2_queue *q) | |
792 | { | |
793 | if (!(q->io_modes & VB2_DMABUF) || !q->mem_ops->attach_dmabuf || | |
794 | !q->mem_ops->detach_dmabuf || !q->mem_ops->map_dmabuf || | |
795 | !q->mem_ops->unmap_dmabuf) | |
796 | return -EINVAL; | |
797 | ||
798 | return 0; | |
799 | } | |
800 | ||
e23ccc0a | 801 | /** |
37d9ed94 HV |
802 | * __verify_memory_type() - Check whether the memory type and buffer type |
803 | * passed to a buffer operation are compatible with the queue. | |
804 | */ | |
805 | static int __verify_memory_type(struct vb2_queue *q, | |
806 | enum v4l2_memory memory, enum v4l2_buf_type type) | |
807 | { | |
c5384048 SS |
808 | if (memory != V4L2_MEMORY_MMAP && memory != V4L2_MEMORY_USERPTR && |
809 | memory != V4L2_MEMORY_DMABUF) { | |
fd4354cf | 810 | dprintk(1, "unsupported memory type\n"); |
37d9ed94 HV |
811 | return -EINVAL; |
812 | } | |
813 | ||
814 | if (type != q->type) { | |
fd4354cf | 815 | dprintk(1, "requested type is incorrect\n"); |
37d9ed94 HV |
816 | return -EINVAL; |
817 | } | |
818 | ||
819 | /* | |
820 | * Make sure all the required memory ops for given memory type | |
821 | * are available. | |
822 | */ | |
823 | if (memory == V4L2_MEMORY_MMAP && __verify_mmap_ops(q)) { | |
fd4354cf | 824 | dprintk(1, "MMAP for current setup unsupported\n"); |
37d9ed94 HV |
825 | return -EINVAL; |
826 | } | |
827 | ||
828 | if (memory == V4L2_MEMORY_USERPTR && __verify_userptr_ops(q)) { | |
fd4354cf | 829 | dprintk(1, "USERPTR for current setup unsupported\n"); |
37d9ed94 HV |
830 | return -EINVAL; |
831 | } | |
832 | ||
c5384048 | 833 | if (memory == V4L2_MEMORY_DMABUF && __verify_dmabuf_ops(q)) { |
fd4354cf | 834 | dprintk(1, "DMABUF for current setup unsupported\n"); |
c5384048 SS |
835 | return -EINVAL; |
836 | } | |
837 | ||
37d9ed94 HV |
838 | /* |
839 | * Place the busy tests at the end: -EBUSY can be ignored when | |
840 | * create_bufs is called with count == 0, but count == 0 should still | |
841 | * do the memory and type validation. | |
842 | */ | |
74753cff | 843 | if (vb2_fileio_is_active(q)) { |
fd4354cf | 844 | dprintk(1, "file io in progress\n"); |
37d9ed94 HV |
845 | return -EBUSY; |
846 | } | |
847 | return 0; | |
848 | } | |
849 | ||
850 | /** | |
851 | * __reqbufs() - Initiate streaming | |
e23ccc0a PO |
852 | * @q: videobuf2 queue |
853 | * @req: struct passed from userspace to vidioc_reqbufs handler in driver | |
854 | * | |
855 | * Should be called from vidioc_reqbufs ioctl handler of a driver. | |
856 | * This function: | |
857 | * 1) verifies streaming parameters passed from the userspace, | |
858 | * 2) sets up the queue, | |
859 | * 3) negotiates number of buffers and planes per buffer with the driver | |
860 | * to be used during streaming, | |
861 | * 4) allocates internal buffer structures (struct vb2_buffer), according to | |
862 | * the agreed parameters, | |
863 | * 5) for MMAP memory type, allocates actual video memory, using the | |
864 | * memory handling/allocation routines provided during queue initialization | |
865 | * | |
866 | * If req->count is 0, all the memory will be freed instead. | |
867 | * If the queue has been allocated previously (by a previous vb2_reqbufs) call | |
868 | * and the queue is not busy, memory will be reallocated. | |
869 | * | |
870 | * The return values from this function are intended to be directly returned | |
871 | * from vidioc_reqbufs handler in driver. | |
872 | */ | |
37d9ed94 | 873 | static int __reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req) |
e23ccc0a | 874 | { |
2d86401c | 875 | unsigned int num_buffers, allocated_buffers, num_planes = 0; |
37d9ed94 | 876 | int ret; |
e23ccc0a PO |
877 | |
878 | if (q->streaming) { | |
fd4354cf | 879 | dprintk(1, "streaming active\n"); |
e23ccc0a PO |
880 | return -EBUSY; |
881 | } | |
882 | ||
29e3fbd8 | 883 | if (req->count == 0 || q->num_buffers != 0 || q->memory != req->memory) { |
e23ccc0a PO |
884 | /* |
885 | * We already have buffers allocated, so first check if they | |
886 | * are not in use and can be freed. | |
887 | */ | |
f035eb4e | 888 | mutex_lock(&q->mmap_lock); |
e23ccc0a | 889 | if (q->memory == V4L2_MEMORY_MMAP && __buffers_in_use(q)) { |
f035eb4e | 890 | mutex_unlock(&q->mmap_lock); |
fd4354cf | 891 | dprintk(1, "memory in use, cannot free\n"); |
e23ccc0a PO |
892 | return -EBUSY; |
893 | } | |
894 | ||
fb64dca8 HV |
895 | /* |
896 | * Call queue_cancel to clean up any buffers in the PREPARED or | |
897 | * QUEUED state which is possible if buffers were prepared or | |
898 | * queued without ever calling STREAMON. | |
899 | */ | |
900 | __vb2_queue_cancel(q); | |
63faabfd | 901 | ret = __vb2_queue_free(q, q->num_buffers); |
f035eb4e | 902 | mutex_unlock(&q->mmap_lock); |
63faabfd HV |
903 | if (ret) |
904 | return ret; | |
29e3fbd8 MS |
905 | |
906 | /* | |
907 | * In case of REQBUFS(0) return immediately without calling | |
908 | * driver's queue_setup() callback and allocating resources. | |
909 | */ | |
910 | if (req->count == 0) | |
911 | return 0; | |
e23ccc0a PO |
912 | } |
913 | ||
914 | /* | |
915 | * Make sure the requested values and current defaults are sane. | |
916 | */ | |
917 | num_buffers = min_t(unsigned int, req->count, VIDEO_MAX_FRAME); | |
4cf743de | 918 | num_buffers = max_t(unsigned int, num_buffers, q->min_buffers_needed); |
c1426bc7 | 919 | memset(q->plane_sizes, 0, sizeof(q->plane_sizes)); |
e23ccc0a | 920 | memset(q->alloc_ctx, 0, sizeof(q->alloc_ctx)); |
13b14095 | 921 | q->memory = req->memory; |
e23ccc0a PO |
922 | |
923 | /* | |
924 | * Ask the driver how many buffers and planes per buffer it requires. | |
925 | * Driver also sets the size and allocator context for each plane. | |
926 | */ | |
fc714e70 | 927 | ret = call_qop(q, queue_setup, q, NULL, &num_buffers, &num_planes, |
c1426bc7 | 928 | q->plane_sizes, q->alloc_ctx); |
a1d36d8c | 929 | if (ret) |
e23ccc0a PO |
930 | return ret; |
931 | ||
932 | /* Finally, allocate buffers and video memory */ | |
a7afcacc HV |
933 | allocated_buffers = __vb2_queue_alloc(q, req->memory, num_buffers, num_planes); |
934 | if (allocated_buffers == 0) { | |
3050040b | 935 | dprintk(1, "memory allocation failed\n"); |
66072d4f | 936 | return -ENOMEM; |
e23ccc0a PO |
937 | } |
938 | ||
b3379c62 HV |
939 | /* |
940 | * There is no point in continuing if we can't allocate the minimum | |
941 | * number of buffers needed by this vb2_queue. | |
942 | */ | |
943 | if (allocated_buffers < q->min_buffers_needed) | |
944 | ret = -ENOMEM; | |
945 | ||
e23ccc0a PO |
946 | /* |
947 | * Check if driver can handle the allocated number of buffers. | |
948 | */ | |
b3379c62 | 949 | if (!ret && allocated_buffers < num_buffers) { |
2d86401c | 950 | num_buffers = allocated_buffers; |
e23ccc0a | 951 | |
fc714e70 GL |
952 | ret = call_qop(q, queue_setup, q, NULL, &num_buffers, |
953 | &num_planes, q->plane_sizes, q->alloc_ctx); | |
e23ccc0a | 954 | |
2d86401c | 955 | if (!ret && allocated_buffers < num_buffers) |
e23ccc0a | 956 | ret = -ENOMEM; |
e23ccc0a PO |
957 | |
958 | /* | |
2d86401c GL |
959 | * Either the driver has accepted a smaller number of buffers, |
960 | * or .queue_setup() returned an error | |
e23ccc0a | 961 | */ |
2d86401c GL |
962 | } |
963 | ||
f035eb4e | 964 | mutex_lock(&q->mmap_lock); |
2d86401c GL |
965 | q->num_buffers = allocated_buffers; |
966 | ||
967 | if (ret < 0) { | |
a7afcacc HV |
968 | /* |
969 | * Note: __vb2_queue_free() will subtract 'allocated_buffers' | |
970 | * from q->num_buffers. | |
971 | */ | |
2d86401c | 972 | __vb2_queue_free(q, allocated_buffers); |
f035eb4e | 973 | mutex_unlock(&q->mmap_lock); |
2d86401c | 974 | return ret; |
e23ccc0a | 975 | } |
f035eb4e | 976 | mutex_unlock(&q->mmap_lock); |
e23ccc0a | 977 | |
e23ccc0a PO |
978 | /* |
979 | * Return the number of successfully allocated buffers | |
980 | * to the userspace. | |
981 | */ | |
2d86401c | 982 | req->count = allocated_buffers; |
58d75f4b | 983 | q->waiting_for_buffers = !V4L2_TYPE_IS_OUTPUT(q->type); |
e23ccc0a PO |
984 | |
985 | return 0; | |
e23ccc0a | 986 | } |
37d9ed94 HV |
987 | |
988 | /** | |
989 | * vb2_reqbufs() - Wrapper for __reqbufs() that also verifies the memory and | |
990 | * type values. | |
991 | * @q: videobuf2 queue | |
992 | * @req: struct passed from userspace to vidioc_reqbufs handler in driver | |
993 | */ | |
994 | int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req) | |
995 | { | |
996 | int ret = __verify_memory_type(q, req->memory, req->type); | |
997 | ||
998 | return ret ? ret : __reqbufs(q, req); | |
999 | } | |
e23ccc0a PO |
1000 | EXPORT_SYMBOL_GPL(vb2_reqbufs); |
1001 | ||
2d86401c | 1002 | /** |
37d9ed94 | 1003 | * __create_bufs() - Allocate buffers and any required auxiliary structs |
2d86401c GL |
1004 | * @q: videobuf2 queue |
1005 | * @create: creation parameters, passed from userspace to vidioc_create_bufs | |
1006 | * handler in driver | |
1007 | * | |
1008 | * Should be called from vidioc_create_bufs ioctl handler of a driver. | |
1009 | * This function: | |
1010 | * 1) verifies parameter sanity | |
1011 | * 2) calls the .queue_setup() queue operation | |
1012 | * 3) performs any necessary memory allocations | |
1013 | * | |
1014 | * The return values from this function are intended to be directly returned | |
1015 | * from vidioc_create_bufs handler in driver. | |
1016 | */ | |
37d9ed94 | 1017 | static int __create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) |
2d86401c GL |
1018 | { |
1019 | unsigned int num_planes = 0, num_buffers, allocated_buffers; | |
37d9ed94 | 1020 | int ret; |
2d86401c GL |
1021 | |
1022 | if (q->num_buffers == VIDEO_MAX_FRAME) { | |
fd4354cf | 1023 | dprintk(1, "maximum number of buffers already allocated\n"); |
2d86401c GL |
1024 | return -ENOBUFS; |
1025 | } | |
1026 | ||
2d86401c GL |
1027 | if (!q->num_buffers) { |
1028 | memset(q->plane_sizes, 0, sizeof(q->plane_sizes)); | |
1029 | memset(q->alloc_ctx, 0, sizeof(q->alloc_ctx)); | |
1030 | q->memory = create->memory; | |
58d75f4b | 1031 | q->waiting_for_buffers = !V4L2_TYPE_IS_OUTPUT(q->type); |
2d86401c GL |
1032 | } |
1033 | ||
1034 | num_buffers = min(create->count, VIDEO_MAX_FRAME - q->num_buffers); | |
1035 | ||
1036 | /* | |
1037 | * Ask the driver, whether the requested number of buffers, planes per | |
1038 | * buffer and their sizes are acceptable | |
1039 | */ | |
1040 | ret = call_qop(q, queue_setup, q, &create->format, &num_buffers, | |
1041 | &num_planes, q->plane_sizes, q->alloc_ctx); | |
a1d36d8c | 1042 | if (ret) |
2d86401c GL |
1043 | return ret; |
1044 | ||
1045 | /* Finally, allocate buffers and video memory */ | |
a7afcacc | 1046 | allocated_buffers = __vb2_queue_alloc(q, create->memory, num_buffers, |
2d86401c | 1047 | num_planes); |
a7afcacc | 1048 | if (allocated_buffers == 0) { |
3050040b | 1049 | dprintk(1, "memory allocation failed\n"); |
f05393d2 | 1050 | return -ENOMEM; |
2d86401c GL |
1051 | } |
1052 | ||
2d86401c GL |
1053 | /* |
1054 | * Check if driver can handle the so far allocated number of buffers. | |
1055 | */ | |
a7afcacc HV |
1056 | if (allocated_buffers < num_buffers) { |
1057 | num_buffers = allocated_buffers; | |
2d86401c GL |
1058 | |
1059 | /* | |
1060 | * q->num_buffers contains the total number of buffers, that the | |
1061 | * queue driver has set up | |
1062 | */ | |
1063 | ret = call_qop(q, queue_setup, q, &create->format, &num_buffers, | |
1064 | &num_planes, q->plane_sizes, q->alloc_ctx); | |
1065 | ||
1066 | if (!ret && allocated_buffers < num_buffers) | |
1067 | ret = -ENOMEM; | |
1068 | ||
1069 | /* | |
1070 | * Either the driver has accepted a smaller number of buffers, | |
1071 | * or .queue_setup() returned an error | |
1072 | */ | |
1073 | } | |
1074 | ||
f035eb4e | 1075 | mutex_lock(&q->mmap_lock); |
2d86401c GL |
1076 | q->num_buffers += allocated_buffers; |
1077 | ||
1078 | if (ret < 0) { | |
a7afcacc HV |
1079 | /* |
1080 | * Note: __vb2_queue_free() will subtract 'allocated_buffers' | |
1081 | * from q->num_buffers. | |
1082 | */ | |
2d86401c | 1083 | __vb2_queue_free(q, allocated_buffers); |
f035eb4e | 1084 | mutex_unlock(&q->mmap_lock); |
f05393d2 | 1085 | return -ENOMEM; |
2d86401c | 1086 | } |
f035eb4e | 1087 | mutex_unlock(&q->mmap_lock); |
2d86401c GL |
1088 | |
1089 | /* | |
1090 | * Return the number of successfully allocated buffers | |
1091 | * to the userspace. | |
1092 | */ | |
1093 | create->count = allocated_buffers; | |
1094 | ||
1095 | return 0; | |
1096 | } | |
37d9ed94 HV |
1097 | |
1098 | /** | |
53aa3b19 NT |
1099 | * vb2_create_bufs() - Wrapper for __create_bufs() that also verifies the |
1100 | * memory and type values. | |
37d9ed94 HV |
1101 | * @q: videobuf2 queue |
1102 | * @create: creation parameters, passed from userspace to vidioc_create_bufs | |
1103 | * handler in driver | |
1104 | */ | |
1105 | int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) | |
1106 | { | |
1107 | int ret = __verify_memory_type(q, create->memory, create->format.type); | |
1108 | ||
1109 | create->index = q->num_buffers; | |
f05393d2 HV |
1110 | if (create->count == 0) |
1111 | return ret != -EBUSY ? ret : 0; | |
37d9ed94 HV |
1112 | return ret ? ret : __create_bufs(q, create); |
1113 | } | |
2d86401c GL |
1114 | EXPORT_SYMBOL_GPL(vb2_create_bufs); |
1115 | ||
e23ccc0a PO |
1116 | /** |
1117 | * vb2_plane_vaddr() - Return a kernel virtual address of a given plane | |
1118 | * @vb: vb2_buffer to which the plane in question belongs to | |
1119 | * @plane_no: plane number for which the address is to be returned | |
1120 | * | |
1121 | * This function returns a kernel virtual address of a given plane if | |
1122 | * such a mapping exist, NULL otherwise. | |
1123 | */ | |
1124 | void *vb2_plane_vaddr(struct vb2_buffer *vb, unsigned int plane_no) | |
1125 | { | |
a00d0266 | 1126 | if (plane_no > vb->num_planes || !vb->planes[plane_no].mem_priv) |
e23ccc0a PO |
1127 | return NULL; |
1128 | ||
a1d36d8c | 1129 | return call_ptr_memop(vb, vaddr, vb->planes[plane_no].mem_priv); |
e23ccc0a PO |
1130 | |
1131 | } | |
1132 | EXPORT_SYMBOL_GPL(vb2_plane_vaddr); | |
1133 | ||
1134 | /** | |
1135 | * vb2_plane_cookie() - Return allocator specific cookie for the given plane | |
1136 | * @vb: vb2_buffer to which the plane in question belongs to | |
1137 | * @plane_no: plane number for which the cookie is to be returned | |
1138 | * | |
1139 | * This function returns an allocator specific cookie for a given plane if | |
1140 | * available, NULL otherwise. The allocator should provide some simple static | |
1141 | * inline function, which would convert this cookie to the allocator specific | |
1142 | * type that can be used directly by the driver to access the buffer. This can | |
1143 | * be for example physical address, pointer to scatter list or IOMMU mapping. | |
1144 | */ | |
1145 | void *vb2_plane_cookie(struct vb2_buffer *vb, unsigned int plane_no) | |
1146 | { | |
a9ae4692 | 1147 | if (plane_no >= vb->num_planes || !vb->planes[plane_no].mem_priv) |
e23ccc0a PO |
1148 | return NULL; |
1149 | ||
a1d36d8c | 1150 | return call_ptr_memop(vb, cookie, vb->planes[plane_no].mem_priv); |
e23ccc0a PO |
1151 | } |
1152 | EXPORT_SYMBOL_GPL(vb2_plane_cookie); | |
1153 | ||
1154 | /** | |
1155 | * vb2_buffer_done() - inform videobuf that an operation on a buffer is finished | |
1156 | * @vb: vb2_buffer returned from the driver | |
ce0eff01 HV |
1157 | * @state: either VB2_BUF_STATE_DONE if the operation finished successfully, |
1158 | * VB2_BUF_STATE_ERROR if the operation finished with an error or | |
1159 | * VB2_BUF_STATE_QUEUED if the driver wants to requeue buffers. | |
b3379c62 HV |
1160 | * If start_streaming fails then it should return buffers with state |
1161 | * VB2_BUF_STATE_QUEUED to put them back into the queue. | |
e23ccc0a PO |
1162 | * |
1163 | * This function should be called by the driver after a hardware operation on | |
1164 | * a buffer is finished and the buffer may be returned to userspace. The driver | |
1165 | * cannot use this buffer anymore until it is queued back to it by videobuf | |
1166 | * by the means of buf_queue callback. Only buffers previously queued to the | |
1167 | * driver by buf_queue can be passed to this function. | |
b3379c62 HV |
1168 | * |
1169 | * While streaming a buffer can only be returned in state DONE or ERROR. | |
1170 | * The start_streaming op can also return them in case the DMA engine cannot | |
1171 | * be started for some reason. In that case the buffers should be returned with | |
1172 | * state QUEUED. | |
e23ccc0a PO |
1173 | */ |
1174 | void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state) | |
1175 | { | |
1176 | struct vb2_queue *q = vb->vb2_queue; | |
1177 | unsigned long flags; | |
3e0c2f20 | 1178 | unsigned int plane; |
e23ccc0a | 1179 | |
b3379c62 | 1180 | if (WARN_ON(vb->state != VB2_BUF_STATE_ACTIVE)) |
e23ccc0a PO |
1181 | return; |
1182 | ||
bf3593d9 HV |
1183 | if (WARN_ON(state != VB2_BUF_STATE_DONE && |
1184 | state != VB2_BUF_STATE_ERROR && | |
1185 | state != VB2_BUF_STATE_QUEUED)) | |
1186 | state = VB2_BUF_STATE_ERROR; | |
e23ccc0a | 1187 | |
b5b4541e HV |
1188 | #ifdef CONFIG_VIDEO_ADV_DEBUG |
1189 | /* | |
1190 | * Although this is not a callback, it still does have to balance | |
1191 | * with the buf_queue op. So update this counter manually. | |
1192 | */ | |
1193 | vb->cnt_buf_done++; | |
1194 | #endif | |
3050040b | 1195 | dprintk(4, "done processing on buffer %d, state: %d\n", |
9b6f5dc0 | 1196 | vb->v4l2_buf.index, state); |
e23ccc0a | 1197 | |
3e0c2f20 MS |
1198 | /* sync buffers */ |
1199 | for (plane = 0; plane < vb->num_planes; ++plane) | |
a1d36d8c | 1200 | call_void_memop(vb, finish, vb->planes[plane].mem_priv); |
3e0c2f20 | 1201 | |
e23ccc0a PO |
1202 | /* Add the buffer to the done buffers list */ |
1203 | spin_lock_irqsave(&q->done_lock, flags); | |
1204 | vb->state = state; | |
b3379c62 HV |
1205 | if (state != VB2_BUF_STATE_QUEUED) |
1206 | list_add_tail(&vb->done_entry, &q->done_list); | |
6ea3b980 | 1207 | atomic_dec(&q->owned_by_drv_count); |
e23ccc0a PO |
1208 | spin_unlock_irqrestore(&q->done_lock, flags); |
1209 | ||
ce0eff01 HV |
1210 | if (state == VB2_BUF_STATE_QUEUED) { |
1211 | if (q->start_streaming_called) | |
1212 | __enqueue_in_driver(vb); | |
b3379c62 | 1213 | return; |
ce0eff01 | 1214 | } |
b3379c62 | 1215 | |
e23ccc0a PO |
1216 | /* Inform any processes that may be waiting for buffers */ |
1217 | wake_up(&q->done_wq); | |
1218 | } | |
1219 | EXPORT_SYMBOL_GPL(vb2_buffer_done); | |
1220 | ||
34ea4d44 LP |
1221 | /** |
1222 | * vb2_discard_done() - discard all buffers marked as DONE | |
1223 | * @q: videobuf2 queue | |
1224 | * | |
1225 | * This function is intended to be used with suspend/resume operations. It | |
1226 | * discards all 'done' buffers as they would be too old to be requested after | |
1227 | * resume. | |
1228 | * | |
1229 | * Drivers must stop the hardware and synchronize with interrupt handlers and/or | |
1230 | * delayed works before calling this function to make sure no buffer will be | |
1231 | * touched by the driver and/or hardware. | |
1232 | */ | |
1233 | void vb2_discard_done(struct vb2_queue *q) | |
1234 | { | |
1235 | struct vb2_buffer *vb; | |
1236 | unsigned long flags; | |
1237 | ||
1238 | spin_lock_irqsave(&q->done_lock, flags); | |
1239 | list_for_each_entry(vb, &q->done_list, done_entry) | |
1240 | vb->state = VB2_BUF_STATE_ERROR; | |
1241 | spin_unlock_irqrestore(&q->done_lock, flags); | |
1242 | } | |
1243 | EXPORT_SYMBOL_GPL(vb2_discard_done); | |
1244 | ||
e23ccc0a | 1245 | /** |
32a77260 HV |
1246 | * __fill_vb2_buffer() - fill a vb2_buffer with information provided in a |
1247 | * v4l2_buffer by the userspace. The caller has already verified that struct | |
1248 | * v4l2_buffer has a valid number of planes. | |
e23ccc0a | 1249 | */ |
32a77260 | 1250 | static void __fill_vb2_buffer(struct vb2_buffer *vb, const struct v4l2_buffer *b, |
e23ccc0a PO |
1251 | struct v4l2_plane *v4l2_planes) |
1252 | { | |
1253 | unsigned int plane; | |
e23ccc0a | 1254 | |
f61bf13b KD |
1255 | if (V4L2_TYPE_IS_OUTPUT(b->type)) { |
1256 | if (WARN_ON_ONCE(b->bytesused == 0)) { | |
1257 | pr_warn_once("use of bytesused == 0 is deprecated and will be removed in the future,\n"); | |
1258 | if (vb->vb2_queue->allow_zero_bytesused) | |
1259 | pr_warn_once("use VIDIOC_DECODER_CMD(V4L2_DEC_CMD_STOP) instead.\n"); | |
1260 | else | |
1261 | pr_warn_once("use the actual size instead.\n"); | |
1262 | } | |
1263 | } | |
1264 | ||
e23ccc0a | 1265 | if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) { |
e23ccc0a PO |
1266 | if (b->memory == V4L2_MEMORY_USERPTR) { |
1267 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
1268 | v4l2_planes[plane].m.userptr = | |
1269 | b->m.planes[plane].m.userptr; | |
1270 | v4l2_planes[plane].length = | |
1271 | b->m.planes[plane].length; | |
1272 | } | |
1273 | } | |
c5384048 SS |
1274 | if (b->memory == V4L2_MEMORY_DMABUF) { |
1275 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
1276 | v4l2_planes[plane].m.fd = | |
1277 | b->m.planes[plane].m.fd; | |
1278 | v4l2_planes[plane].length = | |
1279 | b->m.planes[plane].length; | |
c5384048 SS |
1280 | } |
1281 | } | |
8a75ffb8 HV |
1282 | |
1283 | /* Fill in driver-provided information for OUTPUT types */ | |
1284 | if (V4L2_TYPE_IS_OUTPUT(b->type)) { | |
1285 | /* | |
1286 | * Will have to go up to b->length when API starts | |
1287 | * accepting variable number of planes. | |
1288 | * | |
1289 | * If bytesused == 0 for the output buffer, then fall | |
1290 | * back to the full buffer size. In that case | |
1291 | * userspace clearly never bothered to set it and | |
1292 | * it's a safe assumption that they really meant to | |
1293 | * use the full plane sizes. | |
f61bf13b KD |
1294 | * |
1295 | * Some drivers, e.g. old codec drivers, use bytesused == 0 | |
1296 | * as a way to indicate that streaming is finished. | |
1297 | * In that case, the driver should use the | |
1298 | * allow_zero_bytesused flag to keep old userspace | |
1299 | * applications working. | |
8a75ffb8 HV |
1300 | */ |
1301 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
1302 | struct v4l2_plane *pdst = &v4l2_planes[plane]; | |
1303 | struct v4l2_plane *psrc = &b->m.planes[plane]; | |
1304 | ||
f61bf13b KD |
1305 | if (vb->vb2_queue->allow_zero_bytesused) |
1306 | pdst->bytesused = psrc->bytesused; | |
1307 | else | |
1308 | pdst->bytesused = psrc->bytesused ? | |
1309 | psrc->bytesused : pdst->length; | |
8a75ffb8 HV |
1310 | pdst->data_offset = psrc->data_offset; |
1311 | } | |
1312 | } | |
e23ccc0a PO |
1313 | } else { |
1314 | /* | |
1315 | * Single-planar buffers do not use planes array, | |
1316 | * so fill in relevant v4l2_buffer struct fields instead. | |
1317 | * In videobuf we use our internal V4l2_planes struct for | |
1318 | * single-planar buffers as well, for simplicity. | |
61bd8fb3 | 1319 | * |
8a75ffb8 HV |
1320 | * If bytesused == 0 for the output buffer, then fall back |
1321 | * to the full buffer size as that's a sensible default. | |
f61bf13b KD |
1322 | * |
1323 | * Some drivers, e.g. old codec drivers, use bytesused == 0 as | |
1324 | * a way to indicate that streaming is finished. In that case, | |
1325 | * the driver should use the allow_zero_bytesused flag to keep | |
1326 | * old userspace applications working. | |
e23ccc0a | 1327 | */ |
e23ccc0a PO |
1328 | if (b->memory == V4L2_MEMORY_USERPTR) { |
1329 | v4l2_planes[0].m.userptr = b->m.userptr; | |
1330 | v4l2_planes[0].length = b->length; | |
1331 | } | |
c5384048 SS |
1332 | |
1333 | if (b->memory == V4L2_MEMORY_DMABUF) { | |
1334 | v4l2_planes[0].m.fd = b->m.fd; | |
1335 | v4l2_planes[0].length = b->length; | |
c5384048 | 1336 | } |
8a75ffb8 | 1337 | |
f61bf13b KD |
1338 | if (V4L2_TYPE_IS_OUTPUT(b->type)) { |
1339 | if (vb->vb2_queue->allow_zero_bytesused) | |
1340 | v4l2_planes[0].bytesused = b->bytesused; | |
1341 | else | |
1342 | v4l2_planes[0].bytesused = b->bytesused ? | |
1343 | b->bytesused : v4l2_planes[0].length; | |
1344 | } else | |
8a75ffb8 HV |
1345 | v4l2_planes[0].bytesused = 0; |
1346 | ||
e23ccc0a PO |
1347 | } |
1348 | ||
f1343281 | 1349 | /* Zero flags that the vb2 core handles */ |
1b18e7a0 | 1350 | vb->v4l2_buf.flags = b->flags & ~V4L2_BUFFER_MASK_FLAGS; |
7ce6fd8f SA |
1351 | if ((vb->vb2_queue->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) != |
1352 | V4L2_BUF_FLAG_TIMESTAMP_COPY || !V4L2_TYPE_IS_OUTPUT(b->type)) { | |
1353 | /* | |
1354 | * Non-COPY timestamps and non-OUTPUT queues will get | |
1355 | * their timestamp and timestamp source flags from the | |
1356 | * queue. | |
1357 | */ | |
1358 | vb->v4l2_buf.flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK; | |
1359 | } | |
1360 | ||
f1343281 HV |
1361 | if (V4L2_TYPE_IS_OUTPUT(b->type)) { |
1362 | /* | |
1363 | * For output buffers mask out the timecode flag: | |
1364 | * this will be handled later in vb2_internal_qbuf(). | |
1365 | * The 'field' is valid metadata for this output buffer | |
1366 | * and so that needs to be copied here. | |
1367 | */ | |
1368 | vb->v4l2_buf.flags &= ~V4L2_BUF_FLAG_TIMECODE; | |
1369 | vb->v4l2_buf.field = b->field; | |
1370 | } else { | |
1371 | /* Zero any output buffer flags as this is a capture buffer */ | |
1372 | vb->v4l2_buf.flags &= ~V4L2_BUFFER_OUT_FLAGS; | |
1373 | } | |
e23ccc0a PO |
1374 | } |
1375 | ||
dcc2428a HV |
1376 | /** |
1377 | * __qbuf_mmap() - handle qbuf of an MMAP buffer | |
1378 | */ | |
1379 | static int __qbuf_mmap(struct vb2_buffer *vb, const struct v4l2_buffer *b) | |
1380 | { | |
1381 | __fill_vb2_buffer(vb, b, vb->v4l2_planes); | |
1382 | return call_vb_qop(vb, buf_prepare, vb); | |
1383 | } | |
1384 | ||
e23ccc0a PO |
1385 | /** |
1386 | * __qbuf_userptr() - handle qbuf of a USERPTR buffer | |
1387 | */ | |
2d86401c | 1388 | static int __qbuf_userptr(struct vb2_buffer *vb, const struct v4l2_buffer *b) |
e23ccc0a PO |
1389 | { |
1390 | struct v4l2_plane planes[VIDEO_MAX_PLANES]; | |
1391 | struct vb2_queue *q = vb->vb2_queue; | |
1392 | void *mem_priv; | |
1393 | unsigned int plane; | |
1394 | int ret; | |
cd474037 HV |
1395 | enum dma_data_direction dma_dir = |
1396 | V4L2_TYPE_IS_OUTPUT(q->type) ? DMA_TO_DEVICE : DMA_FROM_DEVICE; | |
256f3162 | 1397 | bool reacquired = vb->planes[0].mem_priv == NULL; |
e23ccc0a | 1398 | |
412376a1 | 1399 | memset(planes, 0, sizeof(planes[0]) * vb->num_planes); |
32a77260 HV |
1400 | /* Copy relevant information provided by the userspace */ |
1401 | __fill_vb2_buffer(vb, b, planes); | |
e23ccc0a PO |
1402 | |
1403 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
1404 | /* Skip the plane if already verified */ | |
f0b7c7fc MS |
1405 | if (vb->v4l2_planes[plane].m.userptr && |
1406 | vb->v4l2_planes[plane].m.userptr == planes[plane].m.userptr | |
e23ccc0a PO |
1407 | && vb->v4l2_planes[plane].length == planes[plane].length) |
1408 | continue; | |
1409 | ||
fd4354cf | 1410 | dprintk(3, "userspace address for plane %d changed, " |
e23ccc0a PO |
1411 | "reacquiring memory\n", plane); |
1412 | ||
c1426bc7 MS |
1413 | /* Check if the provided plane buffer is large enough */ |
1414 | if (planes[plane].length < q->plane_sizes[plane]) { | |
fd4354cf | 1415 | dprintk(1, "provided buffer size %u is less than " |
2484a7e2 SWK |
1416 | "setup size %u for plane %d\n", |
1417 | planes[plane].length, | |
1418 | q->plane_sizes[plane], plane); | |
4c2625db | 1419 | ret = -EINVAL; |
c1426bc7 MS |
1420 | goto err; |
1421 | } | |
1422 | ||
e23ccc0a | 1423 | /* Release previously acquired memory if present */ |
256f3162 HV |
1424 | if (vb->planes[plane].mem_priv) { |
1425 | if (!reacquired) { | |
1426 | reacquired = true; | |
a1d36d8c | 1427 | call_void_vb_qop(vb, buf_cleanup, vb); |
256f3162 | 1428 | } |
a1d36d8c | 1429 | call_void_memop(vb, put_userptr, vb->planes[plane].mem_priv); |
256f3162 | 1430 | } |
e23ccc0a PO |
1431 | |
1432 | vb->planes[plane].mem_priv = NULL; | |
256f3162 | 1433 | memset(&vb->v4l2_planes[plane], 0, sizeof(struct v4l2_plane)); |
e23ccc0a PO |
1434 | |
1435 | /* Acquire each plane's memory */ | |
a1d36d8c | 1436 | mem_priv = call_ptr_memop(vb, get_userptr, q->alloc_ctx[plane], |
a00d0266 | 1437 | planes[plane].m.userptr, |
cd474037 | 1438 | planes[plane].length, dma_dir); |
a00d0266 | 1439 | if (IS_ERR_OR_NULL(mem_priv)) { |
fd4354cf | 1440 | dprintk(1, "failed acquiring userspace " |
e23ccc0a | 1441 | "memory for plane %d\n", plane); |
a00d0266 MS |
1442 | ret = mem_priv ? PTR_ERR(mem_priv) : -EINVAL; |
1443 | goto err; | |
e23ccc0a | 1444 | } |
a00d0266 | 1445 | vb->planes[plane].mem_priv = mem_priv; |
e23ccc0a PO |
1446 | } |
1447 | ||
e23ccc0a PO |
1448 | /* |
1449 | * Now that everything is in order, copy relevant information | |
1450 | * provided by userspace. | |
1451 | */ | |
1452 | for (plane = 0; plane < vb->num_planes; ++plane) | |
1453 | vb->v4l2_planes[plane] = planes[plane]; | |
1454 | ||
256f3162 HV |
1455 | if (reacquired) { |
1456 | /* | |
1457 | * One or more planes changed, so we must call buf_init to do | |
1458 | * the driver-specific initialization on the newly acquired | |
1459 | * buffer, if provided. | |
1460 | */ | |
1461 | ret = call_vb_qop(vb, buf_init, vb); | |
1462 | if (ret) { | |
fd4354cf | 1463 | dprintk(1, "buffer initialization failed\n"); |
256f3162 HV |
1464 | goto err; |
1465 | } | |
1466 | } | |
1467 | ||
1468 | ret = call_vb_qop(vb, buf_prepare, vb); | |
1469 | if (ret) { | |
fd4354cf | 1470 | dprintk(1, "buffer preparation failed\n"); |
a1d36d8c | 1471 | call_void_vb_qop(vb, buf_cleanup, vb); |
256f3162 HV |
1472 | goto err; |
1473 | } | |
1474 | ||
e23ccc0a PO |
1475 | return 0; |
1476 | err: | |
1477 | /* In case of errors, release planes that were already acquired */ | |
c1426bc7 MS |
1478 | for (plane = 0; plane < vb->num_planes; ++plane) { |
1479 | if (vb->planes[plane].mem_priv) | |
a1d36d8c | 1480 | call_void_memop(vb, put_userptr, vb->planes[plane].mem_priv); |
c1426bc7 MS |
1481 | vb->planes[plane].mem_priv = NULL; |
1482 | vb->v4l2_planes[plane].m.userptr = 0; | |
1483 | vb->v4l2_planes[plane].length = 0; | |
e23ccc0a PO |
1484 | } |
1485 | ||
1486 | return ret; | |
1487 | } | |
1488 | ||
c5384048 SS |
1489 | /** |
1490 | * __qbuf_dmabuf() - handle qbuf of a DMABUF buffer | |
1491 | */ | |
1492 | static int __qbuf_dmabuf(struct vb2_buffer *vb, const struct v4l2_buffer *b) | |
1493 | { | |
1494 | struct v4l2_plane planes[VIDEO_MAX_PLANES]; | |
1495 | struct vb2_queue *q = vb->vb2_queue; | |
1496 | void *mem_priv; | |
1497 | unsigned int plane; | |
1498 | int ret; | |
cd474037 HV |
1499 | enum dma_data_direction dma_dir = |
1500 | V4L2_TYPE_IS_OUTPUT(q->type) ? DMA_TO_DEVICE : DMA_FROM_DEVICE; | |
256f3162 | 1501 | bool reacquired = vb->planes[0].mem_priv == NULL; |
c5384048 | 1502 | |
412376a1 | 1503 | memset(planes, 0, sizeof(planes[0]) * vb->num_planes); |
6f546c5f | 1504 | /* Copy relevant information provided by the userspace */ |
c5384048 SS |
1505 | __fill_vb2_buffer(vb, b, planes); |
1506 | ||
1507 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
1508 | struct dma_buf *dbuf = dma_buf_get(planes[plane].m.fd); | |
1509 | ||
1510 | if (IS_ERR_OR_NULL(dbuf)) { | |
fd4354cf | 1511 | dprintk(1, "invalid dmabuf fd for plane %d\n", |
c5384048 SS |
1512 | plane); |
1513 | ret = -EINVAL; | |
1514 | goto err; | |
1515 | } | |
1516 | ||
1517 | /* use DMABUF size if length is not provided */ | |
1518 | if (planes[plane].length == 0) | |
1519 | planes[plane].length = dbuf->size; | |
1520 | ||
412376a1 | 1521 | if (planes[plane].length < q->plane_sizes[plane]) { |
fd4354cf | 1522 | dprintk(1, "invalid dmabuf length for plane %d\n", |
77c0782e | 1523 | plane); |
c5384048 SS |
1524 | ret = -EINVAL; |
1525 | goto err; | |
1526 | } | |
1527 | ||
1528 | /* Skip the plane if already verified */ | |
1529 | if (dbuf == vb->planes[plane].dbuf && | |
1530 | vb->v4l2_planes[plane].length == planes[plane].length) { | |
1531 | dma_buf_put(dbuf); | |
1532 | continue; | |
1533 | } | |
1534 | ||
fd4354cf | 1535 | dprintk(1, "buffer for plane %d changed\n", plane); |
c5384048 | 1536 | |
256f3162 HV |
1537 | if (!reacquired) { |
1538 | reacquired = true; | |
a1d36d8c | 1539 | call_void_vb_qop(vb, buf_cleanup, vb); |
256f3162 HV |
1540 | } |
1541 | ||
c5384048 | 1542 | /* Release previously acquired memory if present */ |
b5b4541e | 1543 | __vb2_plane_dmabuf_put(vb, &vb->planes[plane]); |
c5384048 SS |
1544 | memset(&vb->v4l2_planes[plane], 0, sizeof(struct v4l2_plane)); |
1545 | ||
1546 | /* Acquire each plane's memory */ | |
a1d36d8c | 1547 | mem_priv = call_ptr_memop(vb, attach_dmabuf, q->alloc_ctx[plane], |
cd474037 | 1548 | dbuf, planes[plane].length, dma_dir); |
c5384048 | 1549 | if (IS_ERR(mem_priv)) { |
fd4354cf | 1550 | dprintk(1, "failed to attach dmabuf\n"); |
c5384048 SS |
1551 | ret = PTR_ERR(mem_priv); |
1552 | dma_buf_put(dbuf); | |
1553 | goto err; | |
1554 | } | |
1555 | ||
1556 | vb->planes[plane].dbuf = dbuf; | |
1557 | vb->planes[plane].mem_priv = mem_priv; | |
1558 | } | |
1559 | ||
1560 | /* TODO: This pins the buffer(s) with dma_buf_map_attachment()).. but | |
1561 | * really we want to do this just before the DMA, not while queueing | |
1562 | * the buffer(s).. | |
1563 | */ | |
1564 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
b5b4541e | 1565 | ret = call_memop(vb, map_dmabuf, vb->planes[plane].mem_priv); |
c5384048 | 1566 | if (ret) { |
fd4354cf | 1567 | dprintk(1, "failed to map dmabuf for plane %d\n", |
c5384048 SS |
1568 | plane); |
1569 | goto err; | |
1570 | } | |
1571 | vb->planes[plane].dbuf_mapped = 1; | |
1572 | } | |
1573 | ||
c5384048 SS |
1574 | /* |
1575 | * Now that everything is in order, copy relevant information | |
1576 | * provided by userspace. | |
1577 | */ | |
1578 | for (plane = 0; plane < vb->num_planes; ++plane) | |
1579 | vb->v4l2_planes[plane] = planes[plane]; | |
1580 | ||
256f3162 HV |
1581 | if (reacquired) { |
1582 | /* | |
1583 | * Call driver-specific initialization on the newly acquired buffer, | |
1584 | * if provided. | |
1585 | */ | |
1586 | ret = call_vb_qop(vb, buf_init, vb); | |
1587 | if (ret) { | |
fd4354cf | 1588 | dprintk(1, "buffer initialization failed\n"); |
256f3162 HV |
1589 | goto err; |
1590 | } | |
1591 | } | |
1592 | ||
1593 | ret = call_vb_qop(vb, buf_prepare, vb); | |
1594 | if (ret) { | |
fd4354cf | 1595 | dprintk(1, "buffer preparation failed\n"); |
a1d36d8c | 1596 | call_void_vb_qop(vb, buf_cleanup, vb); |
256f3162 HV |
1597 | goto err; |
1598 | } | |
1599 | ||
c5384048 SS |
1600 | return 0; |
1601 | err: | |
1602 | /* In case of errors, release planes that were already acquired */ | |
1603 | __vb2_buf_dmabuf_put(vb); | |
1604 | ||
1605 | return ret; | |
1606 | } | |
1607 | ||
e23ccc0a PO |
1608 | /** |
1609 | * __enqueue_in_driver() - enqueue a vb2_buffer in driver for processing | |
1610 | */ | |
1611 | static void __enqueue_in_driver(struct vb2_buffer *vb) | |
1612 | { | |
1613 | struct vb2_queue *q = vb->vb2_queue; | |
3e0c2f20 | 1614 | unsigned int plane; |
e23ccc0a PO |
1615 | |
1616 | vb->state = VB2_BUF_STATE_ACTIVE; | |
6ea3b980 | 1617 | atomic_inc(&q->owned_by_drv_count); |
3e0c2f20 MS |
1618 | |
1619 | /* sync buffers */ | |
1620 | for (plane = 0; plane < vb->num_planes; ++plane) | |
a1d36d8c | 1621 | call_void_memop(vb, prepare, vb->planes[plane].mem_priv); |
3e0c2f20 | 1622 | |
a1d36d8c | 1623 | call_void_vb_qop(vb, buf_queue, vb); |
e23ccc0a PO |
1624 | } |
1625 | ||
2d86401c | 1626 | static int __buf_prepare(struct vb2_buffer *vb, const struct v4l2_buffer *b) |
ebc087d0 GL |
1627 | { |
1628 | struct vb2_queue *q = vb->vb2_queue; | |
1629 | int ret; | |
1630 | ||
8023ed09 | 1631 | ret = __verify_length(vb, b); |
3a9621b0 | 1632 | if (ret < 0) { |
fd4354cf | 1633 | dprintk(1, "plane parameters verification failed: %d\n", ret); |
8023ed09 | 1634 | return ret; |
3a9621b0 | 1635 | } |
e35e41b5 HV |
1636 | if (b->field == V4L2_FIELD_ALTERNATE && V4L2_TYPE_IS_OUTPUT(q->type)) { |
1637 | /* | |
1638 | * If the format's field is ALTERNATE, then the buffer's field | |
1639 | * should be either TOP or BOTTOM, not ALTERNATE since that | |
1640 | * makes no sense. The driver has to know whether the | |
1641 | * buffer represents a top or a bottom field in order to | |
1642 | * program any DMA correctly. Using ALTERNATE is wrong, since | |
1643 | * that just says that it is either a top or a bottom field, | |
1644 | * but not which of the two it is. | |
1645 | */ | |
1646 | dprintk(1, "the field is incorrectly set to ALTERNATE for an output buffer\n"); | |
1647 | return -EINVAL; | |
1648 | } | |
8023ed09 | 1649 | |
4bb7267d LP |
1650 | if (q->error) { |
1651 | dprintk(1, "fatal error occurred on queue\n"); | |
1652 | return -EIO; | |
1653 | } | |
1654 | ||
b18a8ff2 | 1655 | vb->state = VB2_BUF_STATE_PREPARING; |
f1343281 HV |
1656 | vb->v4l2_buf.timestamp.tv_sec = 0; |
1657 | vb->v4l2_buf.timestamp.tv_usec = 0; | |
1658 | vb->v4l2_buf.sequence = 0; | |
1659 | ||
ebc087d0 GL |
1660 | switch (q->memory) { |
1661 | case V4L2_MEMORY_MMAP: | |
1662 | ret = __qbuf_mmap(vb, b); | |
1663 | break; | |
1664 | case V4L2_MEMORY_USERPTR: | |
1665 | ret = __qbuf_userptr(vb, b); | |
1666 | break; | |
c5384048 SS |
1667 | case V4L2_MEMORY_DMABUF: |
1668 | ret = __qbuf_dmabuf(vb, b); | |
1669 | break; | |
ebc087d0 GL |
1670 | default: |
1671 | WARN(1, "Invalid queue type\n"); | |
1672 | ret = -EINVAL; | |
1673 | } | |
1674 | ||
ebc087d0 | 1675 | if (ret) |
fd4354cf | 1676 | dprintk(1, "buffer preparation failed: %d\n", ret); |
b18a8ff2 | 1677 | vb->state = ret ? VB2_BUF_STATE_DEQUEUED : VB2_BUF_STATE_PREPARED; |
ebc087d0 GL |
1678 | |
1679 | return ret; | |
1680 | } | |
1681 | ||
012043b8 | 1682 | static int vb2_queue_or_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b, |
4138111a | 1683 | const char *opname) |
2d86401c | 1684 | { |
2d86401c | 1685 | if (b->type != q->type) { |
fd4354cf | 1686 | dprintk(1, "%s: invalid buffer type\n", opname); |
b18a8ff2 | 1687 | return -EINVAL; |
2d86401c GL |
1688 | } |
1689 | ||
1690 | if (b->index >= q->num_buffers) { | |
fd4354cf | 1691 | dprintk(1, "%s: buffer index out of range\n", opname); |
b18a8ff2 | 1692 | return -EINVAL; |
2d86401c GL |
1693 | } |
1694 | ||
4138111a | 1695 | if (q->bufs[b->index] == NULL) { |
2d86401c | 1696 | /* Should never happen */ |
fd4354cf | 1697 | dprintk(1, "%s: buffer is NULL\n", opname); |
b18a8ff2 | 1698 | return -EINVAL; |
2d86401c GL |
1699 | } |
1700 | ||
1701 | if (b->memory != q->memory) { | |
fd4354cf | 1702 | dprintk(1, "%s: invalid memory type\n", opname); |
b18a8ff2 | 1703 | return -EINVAL; |
2d86401c GL |
1704 | } |
1705 | ||
4138111a | 1706 | return __verify_planes_array(q->bufs[b->index], b); |
012043b8 | 1707 | } |
2d86401c | 1708 | |
e23ccc0a | 1709 | /** |
012043b8 | 1710 | * vb2_prepare_buf() - Pass ownership of a buffer from userspace to the kernel |
e23ccc0a | 1711 | * @q: videobuf2 queue |
012043b8 LP |
1712 | * @b: buffer structure passed from userspace to vidioc_prepare_buf |
1713 | * handler in driver | |
e23ccc0a | 1714 | * |
012043b8 | 1715 | * Should be called from vidioc_prepare_buf ioctl handler of a driver. |
e23ccc0a PO |
1716 | * This function: |
1717 | * 1) verifies the passed buffer, | |
012043b8 LP |
1718 | * 2) calls buf_prepare callback in the driver (if provided), in which |
1719 | * driver-specific buffer initialization can be performed, | |
e23ccc0a PO |
1720 | * |
1721 | * The return values from this function are intended to be directly returned | |
012043b8 | 1722 | * from vidioc_prepare_buf handler in driver. |
e23ccc0a | 1723 | */ |
012043b8 | 1724 | int vb2_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b) |
e23ccc0a | 1725 | { |
4138111a | 1726 | struct vb2_buffer *vb; |
b2f2f047 HV |
1727 | int ret; |
1728 | ||
74753cff | 1729 | if (vb2_fileio_is_active(q)) { |
fd4354cf | 1730 | dprintk(1, "file io in progress\n"); |
b2f2f047 HV |
1731 | return -EBUSY; |
1732 | } | |
4138111a | 1733 | |
b2f2f047 | 1734 | ret = vb2_queue_or_prepare_buf(q, b, "prepare_buf"); |
4138111a HV |
1735 | if (ret) |
1736 | return ret; | |
1737 | ||
1738 | vb = q->bufs[b->index]; | |
1739 | if (vb->state != VB2_BUF_STATE_DEQUEUED) { | |
fd4354cf | 1740 | dprintk(1, "invalid buffer state %d\n", |
4138111a HV |
1741 | vb->state); |
1742 | return -EINVAL; | |
1743 | } | |
1744 | ||
1745 | ret = __buf_prepare(vb, b); | |
1746 | if (!ret) { | |
1747 | /* Fill buffer information for the userspace */ | |
1748 | __fill_v4l2_buffer(vb, b); | |
1749 | ||
fd4354cf | 1750 | dprintk(1, "prepare of buffer %d succeeded\n", vb->v4l2_buf.index); |
4138111a HV |
1751 | } |
1752 | return ret; | |
012043b8 LP |
1753 | } |
1754 | EXPORT_SYMBOL_GPL(vb2_prepare_buf); | |
e23ccc0a | 1755 | |
02f142ec HV |
1756 | /** |
1757 | * vb2_start_streaming() - Attempt to start streaming. | |
1758 | * @q: videobuf2 queue | |
1759 | * | |
b3379c62 HV |
1760 | * Attempt to start streaming. When this function is called there must be |
1761 | * at least q->min_buffers_needed buffers queued up (i.e. the minimum | |
1762 | * number of buffers required for the DMA engine to function). If the | |
1763 | * @start_streaming op fails it is supposed to return all the driver-owned | |
1764 | * buffers back to vb2 in state QUEUED. Check if that happened and if | |
1765 | * not warn and reclaim them forcefully. | |
02f142ec HV |
1766 | */ |
1767 | static int vb2_start_streaming(struct vb2_queue *q) | |
1768 | { | |
b3379c62 | 1769 | struct vb2_buffer *vb; |
02f142ec HV |
1770 | int ret; |
1771 | ||
02f142ec | 1772 | /* |
b3379c62 HV |
1773 | * If any buffers were queued before streamon, |
1774 | * we can now pass them to driver for processing. | |
02f142ec | 1775 | */ |
b3379c62 HV |
1776 | list_for_each_entry(vb, &q->queued_list, queued_entry) |
1777 | __enqueue_in_driver(vb); | |
1778 | ||
1779 | /* Tell the driver to start streaming */ | |
bd994ddb | 1780 | q->start_streaming_called = 1; |
b3379c62 HV |
1781 | ret = call_qop(q, start_streaming, q, |
1782 | atomic_read(&q->owned_by_drv_count)); | |
b3379c62 | 1783 | if (!ret) |
02f142ec | 1784 | return 0; |
b3379c62 | 1785 | |
bd994ddb LP |
1786 | q->start_streaming_called = 0; |
1787 | ||
fd4354cf | 1788 | dprintk(1, "driver refused to start streaming\n"); |
23cd08c8 HV |
1789 | /* |
1790 | * If you see this warning, then the driver isn't cleaning up properly | |
1791 | * after a failed start_streaming(). See the start_streaming() | |
1792 | * documentation in videobuf2-core.h for more information how buffers | |
1793 | * should be returned to vb2 in start_streaming(). | |
1794 | */ | |
b3379c62 HV |
1795 | if (WARN_ON(atomic_read(&q->owned_by_drv_count))) { |
1796 | unsigned i; | |
1797 | ||
1798 | /* | |
1799 | * Forcefully reclaim buffers if the driver did not | |
1800 | * correctly return them to vb2. | |
1801 | */ | |
1802 | for (i = 0; i < q->num_buffers; ++i) { | |
1803 | vb = q->bufs[i]; | |
1804 | if (vb->state == VB2_BUF_STATE_ACTIVE) | |
1805 | vb2_buffer_done(vb, VB2_BUF_STATE_QUEUED); | |
1806 | } | |
1807 | /* Must be zero now */ | |
1808 | WARN_ON(atomic_read(&q->owned_by_drv_count)); | |
02f142ec | 1809 | } |
bf3593d9 HV |
1810 | /* |
1811 | * If done_list is not empty, then start_streaming() didn't call | |
1812 | * vb2_buffer_done(vb, VB2_BUF_STATE_QUEUED) but STATE_ERROR or | |
1813 | * STATE_DONE. | |
1814 | */ | |
1815 | WARN_ON(!list_empty(&q->done_list)); | |
02f142ec HV |
1816 | return ret; |
1817 | } | |
1818 | ||
b2f2f047 | 1819 | static int vb2_internal_qbuf(struct vb2_queue *q, struct v4l2_buffer *b) |
012043b8 | 1820 | { |
4138111a HV |
1821 | int ret = vb2_queue_or_prepare_buf(q, b, "qbuf"); |
1822 | struct vb2_buffer *vb; | |
1823 | ||
1824 | if (ret) | |
1825 | return ret; | |
1826 | ||
1827 | vb = q->bufs[b->index]; | |
e23ccc0a | 1828 | |
ebc087d0 GL |
1829 | switch (vb->state) { |
1830 | case VB2_BUF_STATE_DEQUEUED: | |
1831 | ret = __buf_prepare(vb, b); | |
1832 | if (ret) | |
012043b8 | 1833 | return ret; |
4138111a | 1834 | break; |
ebc087d0 GL |
1835 | case VB2_BUF_STATE_PREPARED: |
1836 | break; | |
b18a8ff2 | 1837 | case VB2_BUF_STATE_PREPARING: |
fd4354cf | 1838 | dprintk(1, "buffer still being prepared\n"); |
b18a8ff2 | 1839 | return -EINVAL; |
ebc087d0 | 1840 | default: |
fd4354cf | 1841 | dprintk(1, "invalid buffer state %d\n", vb->state); |
012043b8 | 1842 | return -EINVAL; |
e23ccc0a PO |
1843 | } |
1844 | ||
e23ccc0a PO |
1845 | /* |
1846 | * Add to the queued buffers list, a buffer will stay on it until | |
1847 | * dequeued in dqbuf. | |
1848 | */ | |
1849 | list_add_tail(&vb->queued_entry, &q->queued_list); | |
b3379c62 | 1850 | q->queued_count++; |
58d75f4b | 1851 | q->waiting_for_buffers = false; |
e23ccc0a | 1852 | vb->state = VB2_BUF_STATE_QUEUED; |
f1343281 HV |
1853 | if (V4L2_TYPE_IS_OUTPUT(q->type)) { |
1854 | /* | |
1855 | * For output buffers copy the timestamp if needed, | |
1856 | * and the timecode field and flag if needed. | |
1857 | */ | |
c57ff792 SA |
1858 | if ((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == |
1859 | V4L2_BUF_FLAG_TIMESTAMP_COPY) | |
f1343281 HV |
1860 | vb->v4l2_buf.timestamp = b->timestamp; |
1861 | vb->v4l2_buf.flags |= b->flags & V4L2_BUF_FLAG_TIMECODE; | |
1862 | if (b->flags & V4L2_BUF_FLAG_TIMECODE) | |
1863 | vb->v4l2_buf.timecode = b->timecode; | |
1864 | } | |
e23ccc0a PO |
1865 | |
1866 | /* | |
1867 | * If already streaming, give the buffer to driver for processing. | |
1868 | * If not, the buffer will be given to driver on next streamon. | |
1869 | */ | |
b3379c62 | 1870 | if (q->start_streaming_called) |
e23ccc0a PO |
1871 | __enqueue_in_driver(vb); |
1872 | ||
4138111a HV |
1873 | /* Fill buffer information for the userspace */ |
1874 | __fill_v4l2_buffer(vb, b); | |
21db3e07 | 1875 | |
b3379c62 HV |
1876 | /* |
1877 | * If streamon has been called, and we haven't yet called | |
1878 | * start_streaming() since not enough buffers were queued, and | |
1879 | * we now have reached the minimum number of queued buffers, | |
1880 | * then we can finally call start_streaming(). | |
1881 | */ | |
1882 | if (q->streaming && !q->start_streaming_called && | |
1883 | q->queued_count >= q->min_buffers_needed) { | |
02f142ec HV |
1884 | ret = vb2_start_streaming(q); |
1885 | if (ret) | |
1886 | return ret; | |
1887 | } | |
1888 | ||
fd4354cf | 1889 | dprintk(1, "qbuf of buffer %d succeeded\n", vb->v4l2_buf.index); |
4138111a | 1890 | return 0; |
e23ccc0a | 1891 | } |
b2f2f047 HV |
1892 | |
1893 | /** | |
1894 | * vb2_qbuf() - Queue a buffer from userspace | |
1895 | * @q: videobuf2 queue | |
1896 | * @b: buffer structure passed from userspace to vidioc_qbuf handler | |
1897 | * in driver | |
1898 | * | |
1899 | * Should be called from vidioc_qbuf ioctl handler of a driver. | |
1900 | * This function: | |
1901 | * 1) verifies the passed buffer, | |
1902 | * 2) if necessary, calls buf_prepare callback in the driver (if provided), in | |
1903 | * which driver-specific buffer initialization can be performed, | |
1904 | * 3) if streaming is on, queues the buffer in driver by the means of buf_queue | |
1905 | * callback for processing. | |
1906 | * | |
1907 | * The return values from this function are intended to be directly returned | |
1908 | * from vidioc_qbuf handler in driver. | |
1909 | */ | |
1910 | int vb2_qbuf(struct vb2_queue *q, struct v4l2_buffer *b) | |
1911 | { | |
74753cff | 1912 | if (vb2_fileio_is_active(q)) { |
fd4354cf | 1913 | dprintk(1, "file io in progress\n"); |
b2f2f047 HV |
1914 | return -EBUSY; |
1915 | } | |
1916 | ||
1917 | return vb2_internal_qbuf(q, b); | |
1918 | } | |
e23ccc0a PO |
1919 | EXPORT_SYMBOL_GPL(vb2_qbuf); |
1920 | ||
1921 | /** | |
1922 | * __vb2_wait_for_done_vb() - wait for a buffer to become available | |
1923 | * for dequeuing | |
1924 | * | |
1925 | * Will sleep if required for nonblocking == false. | |
1926 | */ | |
1927 | static int __vb2_wait_for_done_vb(struct vb2_queue *q, int nonblocking) | |
1928 | { | |
1929 | /* | |
1930 | * All operations on vb_done_list are performed under done_lock | |
1931 | * spinlock protection. However, buffers may be removed from | |
1932 | * it and returned to userspace only while holding both driver's | |
1933 | * lock and the done_lock spinlock. Thus we can be sure that as | |
1934 | * long as we hold the driver's lock, the list will remain not | |
1935 | * empty if list_empty() check succeeds. | |
1936 | */ | |
1937 | ||
1938 | for (;;) { | |
1939 | int ret; | |
1940 | ||
1941 | if (!q->streaming) { | |
3050040b | 1942 | dprintk(1, "streaming off, will not wait for buffers\n"); |
e23ccc0a PO |
1943 | return -EINVAL; |
1944 | } | |
1945 | ||
4bb7267d LP |
1946 | if (q->error) { |
1947 | dprintk(1, "Queue in error state, will not wait for buffers\n"); | |
1948 | return -EIO; | |
1949 | } | |
1950 | ||
c1621840 PZ |
1951 | if (q->last_buffer_dequeued) { |
1952 | dprintk(3, "last buffer dequeued already, will not wait for buffers\n"); | |
1953 | return -EPIPE; | |
1954 | } | |
1955 | ||
e23ccc0a PO |
1956 | if (!list_empty(&q->done_list)) { |
1957 | /* | |
1958 | * Found a buffer that we were waiting for. | |
1959 | */ | |
1960 | break; | |
1961 | } | |
1962 | ||
1963 | if (nonblocking) { | |
3050040b | 1964 | dprintk(1, "nonblocking and no buffers to dequeue, " |
e23ccc0a PO |
1965 | "will not wait\n"); |
1966 | return -EAGAIN; | |
1967 | } | |
1968 | ||
1969 | /* | |
1970 | * We are streaming and blocking, wait for another buffer to | |
1971 | * become ready or for streamoff. Driver's lock is released to | |
1972 | * allow streamoff or qbuf to be called while waiting. | |
1973 | */ | |
a1d36d8c | 1974 | call_void_qop(q, wait_prepare, q); |
e23ccc0a PO |
1975 | |
1976 | /* | |
1977 | * All locks have been released, it is safe to sleep now. | |
1978 | */ | |
3050040b | 1979 | dprintk(3, "will sleep waiting for buffers\n"); |
e23ccc0a | 1980 | ret = wait_event_interruptible(q->done_wq, |
4bb7267d LP |
1981 | !list_empty(&q->done_list) || !q->streaming || |
1982 | q->error); | |
e23ccc0a PO |
1983 | |
1984 | /* | |
1985 | * We need to reevaluate both conditions again after reacquiring | |
1986 | * the locks or return an error if one occurred. | |
1987 | */ | |
a1d36d8c | 1988 | call_void_qop(q, wait_finish, q); |
32a77260 | 1989 | if (ret) { |
3050040b | 1990 | dprintk(1, "sleep was interrupted\n"); |
e23ccc0a | 1991 | return ret; |
32a77260 | 1992 | } |
e23ccc0a PO |
1993 | } |
1994 | return 0; | |
1995 | } | |
1996 | ||
1997 | /** | |
1998 | * __vb2_get_done_vb() - get a buffer ready for dequeuing | |
1999 | * | |
2000 | * Will sleep if required for nonblocking == false. | |
2001 | */ | |
2002 | static int __vb2_get_done_vb(struct vb2_queue *q, struct vb2_buffer **vb, | |
32a77260 | 2003 | struct v4l2_buffer *b, int nonblocking) |
e23ccc0a PO |
2004 | { |
2005 | unsigned long flags; | |
2006 | int ret; | |
2007 | ||
2008 | /* | |
2009 | * Wait for at least one buffer to become available on the done_list. | |
2010 | */ | |
2011 | ret = __vb2_wait_for_done_vb(q, nonblocking); | |
2012 | if (ret) | |
2013 | return ret; | |
2014 | ||
2015 | /* | |
2016 | * Driver's lock has been held since we last verified that done_list | |
2017 | * is not empty, so no need for another list_empty(done_list) check. | |
2018 | */ | |
2019 | spin_lock_irqsave(&q->done_lock, flags); | |
2020 | *vb = list_first_entry(&q->done_list, struct vb2_buffer, done_entry); | |
32a77260 HV |
2021 | /* |
2022 | * Only remove the buffer from done_list if v4l2_buffer can handle all | |
2023 | * the planes. | |
2024 | */ | |
2025 | ret = __verify_planes_array(*vb, b); | |
2026 | if (!ret) | |
2027 | list_del(&(*vb)->done_entry); | |
e23ccc0a PO |
2028 | spin_unlock_irqrestore(&q->done_lock, flags); |
2029 | ||
32a77260 | 2030 | return ret; |
e23ccc0a PO |
2031 | } |
2032 | ||
2033 | /** | |
2034 | * vb2_wait_for_all_buffers() - wait until all buffers are given back to vb2 | |
2035 | * @q: videobuf2 queue | |
2036 | * | |
2037 | * This function will wait until all buffers that have been given to the driver | |
2038 | * by buf_queue() are given back to vb2 with vb2_buffer_done(). It doesn't call | |
2039 | * wait_prepare, wait_finish pair. It is intended to be called with all locks | |
2040 | * taken, for example from stop_streaming() callback. | |
2041 | */ | |
2042 | int vb2_wait_for_all_buffers(struct vb2_queue *q) | |
2043 | { | |
2044 | if (!q->streaming) { | |
3050040b | 2045 | dprintk(1, "streaming off, will not wait for buffers\n"); |
e23ccc0a PO |
2046 | return -EINVAL; |
2047 | } | |
2048 | ||
b3379c62 | 2049 | if (q->start_streaming_called) |
6ea3b980 | 2050 | wait_event(q->done_wq, !atomic_read(&q->owned_by_drv_count)); |
e23ccc0a PO |
2051 | return 0; |
2052 | } | |
2053 | EXPORT_SYMBOL_GPL(vb2_wait_for_all_buffers); | |
2054 | ||
c5384048 SS |
2055 | /** |
2056 | * __vb2_dqbuf() - bring back the buffer to the DEQUEUED state | |
2057 | */ | |
2058 | static void __vb2_dqbuf(struct vb2_buffer *vb) | |
2059 | { | |
2060 | struct vb2_queue *q = vb->vb2_queue; | |
2061 | unsigned int i; | |
2062 | ||
2063 | /* nothing to do if the buffer is already dequeued */ | |
2064 | if (vb->state == VB2_BUF_STATE_DEQUEUED) | |
2065 | return; | |
2066 | ||
2067 | vb->state = VB2_BUF_STATE_DEQUEUED; | |
2068 | ||
2069 | /* unmap DMABUF buffer */ | |
2070 | if (q->memory == V4L2_MEMORY_DMABUF) | |
2071 | for (i = 0; i < vb->num_planes; ++i) { | |
2072 | if (!vb->planes[i].dbuf_mapped) | |
2073 | continue; | |
a1d36d8c | 2074 | call_void_memop(vb, unmap_dmabuf, vb->planes[i].mem_priv); |
c5384048 SS |
2075 | vb->planes[i].dbuf_mapped = 0; |
2076 | } | |
2077 | } | |
2078 | ||
b2f2f047 | 2079 | static int vb2_internal_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking) |
e23ccc0a PO |
2080 | { |
2081 | struct vb2_buffer *vb = NULL; | |
2082 | int ret; | |
2083 | ||
2084 | if (b->type != q->type) { | |
fd4354cf | 2085 | dprintk(1, "invalid buffer type\n"); |
e23ccc0a PO |
2086 | return -EINVAL; |
2087 | } | |
32a77260 HV |
2088 | ret = __vb2_get_done_vb(q, &vb, b, nonblocking); |
2089 | if (ret < 0) | |
e23ccc0a | 2090 | return ret; |
e23ccc0a | 2091 | |
e23ccc0a PO |
2092 | switch (vb->state) { |
2093 | case VB2_BUF_STATE_DONE: | |
3050040b | 2094 | dprintk(3, "returning done buffer\n"); |
e23ccc0a PO |
2095 | break; |
2096 | case VB2_BUF_STATE_ERROR: | |
3050040b | 2097 | dprintk(3, "returning done buffer with errors\n"); |
e23ccc0a PO |
2098 | break; |
2099 | default: | |
3050040b | 2100 | dprintk(1, "invalid buffer state\n"); |
e23ccc0a PO |
2101 | return -EINVAL; |
2102 | } | |
2103 | ||
a1d36d8c | 2104 | call_void_vb_qop(vb, buf_finish, vb); |
9cf3c31a | 2105 | |
e23ccc0a PO |
2106 | /* Fill buffer information for the userspace */ |
2107 | __fill_v4l2_buffer(vb, b); | |
2108 | /* Remove from videobuf queue */ | |
2109 | list_del(&vb->queued_entry); | |
b3379c62 | 2110 | q->queued_count--; |
c1621840 PZ |
2111 | if (!V4L2_TYPE_IS_OUTPUT(q->type) && |
2112 | vb->v4l2_buf.flags & V4L2_BUF_FLAG_LAST) | |
2113 | q->last_buffer_dequeued = true; | |
c5384048 SS |
2114 | /* go back to dequeued state */ |
2115 | __vb2_dqbuf(vb); | |
e23ccc0a PO |
2116 | |
2117 | dprintk(1, "dqbuf of buffer %d, with state %d\n", | |
2118 | vb->v4l2_buf.index, vb->state); | |
2119 | ||
e23ccc0a PO |
2120 | return 0; |
2121 | } | |
b2f2f047 HV |
2122 | |
2123 | /** | |
2124 | * vb2_dqbuf() - Dequeue a buffer to the userspace | |
2125 | * @q: videobuf2 queue | |
2126 | * @b: buffer structure passed from userspace to vidioc_dqbuf handler | |
2127 | * in driver | |
2128 | * @nonblocking: if true, this call will not sleep waiting for a buffer if no | |
2129 | * buffers ready for dequeuing are present. Normally the driver | |
2130 | * would be passing (file->f_flags & O_NONBLOCK) here | |
2131 | * | |
2132 | * Should be called from vidioc_dqbuf ioctl handler of a driver. | |
2133 | * This function: | |
2134 | * 1) verifies the passed buffer, | |
2135 | * 2) calls buf_finish callback in the driver (if provided), in which | |
2136 | * driver can perform any additional operations that may be required before | |
2137 | * returning the buffer to userspace, such as cache sync, | |
2138 | * 3) the buffer struct members are filled with relevant information for | |
2139 | * the userspace. | |
2140 | * | |
2141 | * The return values from this function are intended to be directly returned | |
2142 | * from vidioc_dqbuf handler in driver. | |
2143 | */ | |
2144 | int vb2_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking) | |
2145 | { | |
74753cff | 2146 | if (vb2_fileio_is_active(q)) { |
fd4354cf | 2147 | dprintk(1, "file io in progress\n"); |
b2f2f047 HV |
2148 | return -EBUSY; |
2149 | } | |
2150 | return vb2_internal_dqbuf(q, b, nonblocking); | |
2151 | } | |
e23ccc0a PO |
2152 | EXPORT_SYMBOL_GPL(vb2_dqbuf); |
2153 | ||
bd323e28 MS |
2154 | /** |
2155 | * __vb2_queue_cancel() - cancel and stop (pause) streaming | |
2156 | * | |
2157 | * Removes all queued buffers from driver's queue and all buffers queued by | |
2158 | * userspace from videobuf's queue. Returns to state after reqbufs. | |
2159 | */ | |
2160 | static void __vb2_queue_cancel(struct vb2_queue *q) | |
2161 | { | |
2162 | unsigned int i; | |
2163 | ||
2164 | /* | |
2165 | * Tell driver to stop all transactions and release all queued | |
2166 | * buffers. | |
2167 | */ | |
b3379c62 | 2168 | if (q->start_streaming_called) |
e37559b2 | 2169 | call_void_qop(q, stop_streaming, q); |
b3379c62 | 2170 | |
23cd08c8 HV |
2171 | /* |
2172 | * If you see this warning, then the driver isn't cleaning up properly | |
2173 | * in stop_streaming(). See the stop_streaming() documentation in | |
2174 | * videobuf2-core.h for more information how buffers should be returned | |
2175 | * to vb2 in stop_streaming(). | |
2176 | */ | |
b3379c62 HV |
2177 | if (WARN_ON(atomic_read(&q->owned_by_drv_count))) { |
2178 | for (i = 0; i < q->num_buffers; ++i) | |
2179 | if (q->bufs[i]->state == VB2_BUF_STATE_ACTIVE) | |
2180 | vb2_buffer_done(q->bufs[i], VB2_BUF_STATE_ERROR); | |
2181 | /* Must be zero now */ | |
2182 | WARN_ON(atomic_read(&q->owned_by_drv_count)); | |
2183 | } | |
bd323e28 | 2184 | |
b646f0b7 LP |
2185 | q->streaming = 0; |
2186 | q->start_streaming_called = 0; | |
2187 | q->queued_count = 0; | |
4bb7267d | 2188 | q->error = 0; |
b646f0b7 | 2189 | |
bd323e28 MS |
2190 | /* |
2191 | * Remove all buffers from videobuf's list... | |
2192 | */ | |
2193 | INIT_LIST_HEAD(&q->queued_list); | |
2194 | /* | |
2195 | * ...and done list; userspace will not receive any buffers it | |
2196 | * has not already dequeued before initiating cancel. | |
2197 | */ | |
2198 | INIT_LIST_HEAD(&q->done_list); | |
6ea3b980 | 2199 | atomic_set(&q->owned_by_drv_count, 0); |
bd323e28 MS |
2200 | wake_up_all(&q->done_wq); |
2201 | ||
2202 | /* | |
2203 | * Reinitialize all buffers for next use. | |
9c0863b1 HV |
2204 | * Make sure to call buf_finish for any queued buffers. Normally |
2205 | * that's done in dqbuf, but that's not going to happen when we | |
2206 | * cancel the whole queue. Note: this code belongs here, not in | |
2207 | * __vb2_dqbuf() since in vb2_internal_dqbuf() there is a critical | |
2208 | * call to __fill_v4l2_buffer() after buf_finish(). That order can't | |
2209 | * be changed, so we can't move the buf_finish() to __vb2_dqbuf(). | |
bd323e28 | 2210 | */ |
9c0863b1 HV |
2211 | for (i = 0; i < q->num_buffers; ++i) { |
2212 | struct vb2_buffer *vb = q->bufs[i]; | |
2213 | ||
2214 | if (vb->state != VB2_BUF_STATE_DEQUEUED) { | |
2215 | vb->state = VB2_BUF_STATE_PREPARED; | |
a1d36d8c | 2216 | call_void_vb_qop(vb, buf_finish, vb); |
9c0863b1 HV |
2217 | } |
2218 | __vb2_dqbuf(vb); | |
2219 | } | |
bd323e28 MS |
2220 | } |
2221 | ||
b2f2f047 | 2222 | static int vb2_internal_streamon(struct vb2_queue *q, enum v4l2_buf_type type) |
e23ccc0a | 2223 | { |
5db2c3ba | 2224 | int ret; |
e23ccc0a PO |
2225 | |
2226 | if (type != q->type) { | |
fd4354cf | 2227 | dprintk(1, "invalid stream type\n"); |
e23ccc0a PO |
2228 | return -EINVAL; |
2229 | } | |
2230 | ||
2231 | if (q->streaming) { | |
fd4354cf | 2232 | dprintk(3, "already streaming\n"); |
f956035c | 2233 | return 0; |
e23ccc0a PO |
2234 | } |
2235 | ||
548df783 | 2236 | if (!q->num_buffers) { |
fd4354cf | 2237 | dprintk(1, "no buffers have been allocated\n"); |
548df783 RR |
2238 | return -EINVAL; |
2239 | } | |
2240 | ||
b3379c62 | 2241 | if (q->num_buffers < q->min_buffers_needed) { |
fd4354cf | 2242 | dprintk(1, "need at least %u allocated buffers\n", |
b3379c62 HV |
2243 | q->min_buffers_needed); |
2244 | return -EINVAL; | |
2245 | } | |
249f5a58 | 2246 | |
e23ccc0a | 2247 | /* |
b3379c62 HV |
2248 | * Tell driver to start streaming provided sufficient buffers |
2249 | * are available. | |
e23ccc0a | 2250 | */ |
b3379c62 HV |
2251 | if (q->queued_count >= q->min_buffers_needed) { |
2252 | ret = vb2_start_streaming(q); | |
2253 | if (ret) { | |
2254 | __vb2_queue_cancel(q); | |
2255 | return ret; | |
2256 | } | |
5db2c3ba PO |
2257 | } |
2258 | ||
2259 | q->streaming = 1; | |
e23ccc0a | 2260 | |
fd4354cf | 2261 | dprintk(3, "successful\n"); |
e23ccc0a PO |
2262 | return 0; |
2263 | } | |
e23ccc0a | 2264 | |
4bb7267d LP |
2265 | /** |
2266 | * vb2_queue_error() - signal a fatal error on the queue | |
2267 | * @q: videobuf2 queue | |
2268 | * | |
2269 | * Flag that a fatal unrecoverable error has occurred and wake up all processes | |
2270 | * waiting on the queue. Polling will now set POLLERR and queuing and dequeuing | |
2271 | * buffers will return -EIO. | |
2272 | * | |
2273 | * The error flag will be cleared when cancelling the queue, either from | |
2274 | * vb2_streamoff or vb2_queue_release. Drivers should thus not call this | |
2275 | * function before starting the stream, otherwise the error flag will remain set | |
2276 | * until the queue is released when closing the device node. | |
2277 | */ | |
2278 | void vb2_queue_error(struct vb2_queue *q) | |
2279 | { | |
2280 | q->error = 1; | |
2281 | ||
2282 | wake_up_all(&q->done_wq); | |
2283 | } | |
2284 | EXPORT_SYMBOL_GPL(vb2_queue_error); | |
2285 | ||
e23ccc0a | 2286 | /** |
b2f2f047 | 2287 | * vb2_streamon - start streaming |
e23ccc0a | 2288 | * @q: videobuf2 queue |
b2f2f047 | 2289 | * @type: type argument passed from userspace to vidioc_streamon handler |
e23ccc0a | 2290 | * |
b2f2f047 | 2291 | * Should be called from vidioc_streamon handler of a driver. |
e23ccc0a | 2292 | * This function: |
b2f2f047 HV |
2293 | * 1) verifies current state |
2294 | * 2) passes any previously queued buffers to the driver and starts streaming | |
e23ccc0a | 2295 | * |
e23ccc0a | 2296 | * The return values from this function are intended to be directly returned |
b2f2f047 | 2297 | * from vidioc_streamon handler in the driver. |
e23ccc0a | 2298 | */ |
b2f2f047 | 2299 | int vb2_streamon(struct vb2_queue *q, enum v4l2_buf_type type) |
e23ccc0a | 2300 | { |
74753cff | 2301 | if (vb2_fileio_is_active(q)) { |
fd4354cf | 2302 | dprintk(1, "file io in progress\n"); |
b25748fe MS |
2303 | return -EBUSY; |
2304 | } | |
b2f2f047 HV |
2305 | return vb2_internal_streamon(q, type); |
2306 | } | |
2307 | EXPORT_SYMBOL_GPL(vb2_streamon); | |
b25748fe | 2308 | |
b2f2f047 HV |
2309 | static int vb2_internal_streamoff(struct vb2_queue *q, enum v4l2_buf_type type) |
2310 | { | |
e23ccc0a | 2311 | if (type != q->type) { |
fd4354cf | 2312 | dprintk(1, "invalid stream type\n"); |
e23ccc0a PO |
2313 | return -EINVAL; |
2314 | } | |
2315 | ||
e23ccc0a PO |
2316 | /* |
2317 | * Cancel will pause streaming and remove all buffers from the driver | |
2318 | * and videobuf, effectively returning control over them to userspace. | |
3f1a9a33 HV |
2319 | * |
2320 | * Note that we do this even if q->streaming == 0: if you prepare or | |
2321 | * queue buffers, and then call streamoff without ever having called | |
2322 | * streamon, you would still expect those buffers to be returned to | |
2323 | * their normal dequeued state. | |
e23ccc0a PO |
2324 | */ |
2325 | __vb2_queue_cancel(q); | |
58d75f4b | 2326 | q->waiting_for_buffers = !V4L2_TYPE_IS_OUTPUT(q->type); |
c1621840 | 2327 | q->last_buffer_dequeued = false; |
e23ccc0a | 2328 | |
fd4354cf | 2329 | dprintk(3, "successful\n"); |
e23ccc0a PO |
2330 | return 0; |
2331 | } | |
b2f2f047 HV |
2332 | |
2333 | /** | |
2334 | * vb2_streamoff - stop streaming | |
2335 | * @q: videobuf2 queue | |
2336 | * @type: type argument passed from userspace to vidioc_streamoff handler | |
2337 | * | |
2338 | * Should be called from vidioc_streamoff handler of a driver. | |
2339 | * This function: | |
2340 | * 1) verifies current state, | |
2341 | * 2) stop streaming and dequeues any queued buffers, including those previously | |
2342 | * passed to the driver (after waiting for the driver to finish). | |
2343 | * | |
2344 | * This call can be used for pausing playback. | |
2345 | * The return values from this function are intended to be directly returned | |
2346 | * from vidioc_streamoff handler in the driver | |
2347 | */ | |
2348 | int vb2_streamoff(struct vb2_queue *q, enum v4l2_buf_type type) | |
2349 | { | |
74753cff | 2350 | if (vb2_fileio_is_active(q)) { |
fd4354cf | 2351 | dprintk(1, "file io in progress\n"); |
b2f2f047 HV |
2352 | return -EBUSY; |
2353 | } | |
2354 | return vb2_internal_streamoff(q, type); | |
2355 | } | |
e23ccc0a PO |
2356 | EXPORT_SYMBOL_GPL(vb2_streamoff); |
2357 | ||
2358 | /** | |
2359 | * __find_plane_by_offset() - find plane associated with the given offset off | |
2360 | */ | |
2361 | static int __find_plane_by_offset(struct vb2_queue *q, unsigned long off, | |
2362 | unsigned int *_buffer, unsigned int *_plane) | |
2363 | { | |
2364 | struct vb2_buffer *vb; | |
2365 | unsigned int buffer, plane; | |
2366 | ||
2367 | /* | |
2368 | * Go over all buffers and their planes, comparing the given offset | |
2369 | * with an offset assigned to each plane. If a match is found, | |
2370 | * return its buffer and plane numbers. | |
2371 | */ | |
2372 | for (buffer = 0; buffer < q->num_buffers; ++buffer) { | |
2373 | vb = q->bufs[buffer]; | |
2374 | ||
2375 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
2376 | if (vb->v4l2_planes[plane].m.mem_offset == off) { | |
2377 | *_buffer = buffer; | |
2378 | *_plane = plane; | |
2379 | return 0; | |
2380 | } | |
2381 | } | |
2382 | } | |
2383 | ||
2384 | return -EINVAL; | |
2385 | } | |
2386 | ||
83ae7c5a TS |
2387 | /** |
2388 | * vb2_expbuf() - Export a buffer as a file descriptor | |
2389 | * @q: videobuf2 queue | |
2390 | * @eb: export buffer structure passed from userspace to vidioc_expbuf | |
2391 | * handler in driver | |
2392 | * | |
2393 | * The return values from this function are intended to be directly returned | |
2394 | * from vidioc_expbuf handler in driver. | |
2395 | */ | |
2396 | int vb2_expbuf(struct vb2_queue *q, struct v4l2_exportbuffer *eb) | |
2397 | { | |
2398 | struct vb2_buffer *vb = NULL; | |
2399 | struct vb2_plane *vb_plane; | |
2400 | int ret; | |
2401 | struct dma_buf *dbuf; | |
2402 | ||
2403 | if (q->memory != V4L2_MEMORY_MMAP) { | |
3050040b | 2404 | dprintk(1, "queue is not currently set up for mmap\n"); |
83ae7c5a TS |
2405 | return -EINVAL; |
2406 | } | |
2407 | ||
2408 | if (!q->mem_ops->get_dmabuf) { | |
3050040b | 2409 | dprintk(1, "queue does not support DMA buffer exporting\n"); |
83ae7c5a TS |
2410 | return -EINVAL; |
2411 | } | |
2412 | ||
ea3aba84 | 2413 | if (eb->flags & ~(O_CLOEXEC | O_ACCMODE)) { |
3050040b | 2414 | dprintk(1, "queue does support only O_CLOEXEC and access mode flags\n"); |
83ae7c5a TS |
2415 | return -EINVAL; |
2416 | } | |
2417 | ||
2418 | if (eb->type != q->type) { | |
fd4354cf | 2419 | dprintk(1, "invalid buffer type\n"); |
83ae7c5a TS |
2420 | return -EINVAL; |
2421 | } | |
2422 | ||
2423 | if (eb->index >= q->num_buffers) { | |
2424 | dprintk(1, "buffer index out of range\n"); | |
2425 | return -EINVAL; | |
2426 | } | |
2427 | ||
2428 | vb = q->bufs[eb->index]; | |
2429 | ||
2430 | if (eb->plane >= vb->num_planes) { | |
2431 | dprintk(1, "buffer plane out of range\n"); | |
2432 | return -EINVAL; | |
2433 | } | |
2434 | ||
74753cff HV |
2435 | if (vb2_fileio_is_active(q)) { |
2436 | dprintk(1, "expbuf: file io in progress\n"); | |
2437 | return -EBUSY; | |
2438 | } | |
2439 | ||
83ae7c5a TS |
2440 | vb_plane = &vb->planes[eb->plane]; |
2441 | ||
a1d36d8c | 2442 | dbuf = call_ptr_memop(vb, get_dmabuf, vb_plane->mem_priv, eb->flags & O_ACCMODE); |
83ae7c5a | 2443 | if (IS_ERR_OR_NULL(dbuf)) { |
3050040b | 2444 | dprintk(1, "failed to export buffer %d, plane %d\n", |
83ae7c5a TS |
2445 | eb->index, eb->plane); |
2446 | return -EINVAL; | |
2447 | } | |
2448 | ||
ea3aba84 | 2449 | ret = dma_buf_fd(dbuf, eb->flags & ~O_ACCMODE); |
83ae7c5a TS |
2450 | if (ret < 0) { |
2451 | dprintk(3, "buffer %d, plane %d failed to export (%d)\n", | |
2452 | eb->index, eb->plane, ret); | |
2453 | dma_buf_put(dbuf); | |
2454 | return ret; | |
2455 | } | |
2456 | ||
2457 | dprintk(3, "buffer %d, plane %d exported as %d descriptor\n", | |
2458 | eb->index, eb->plane, ret); | |
2459 | eb->fd = ret; | |
2460 | ||
2461 | return 0; | |
2462 | } | |
2463 | EXPORT_SYMBOL_GPL(vb2_expbuf); | |
2464 | ||
e23ccc0a PO |
2465 | /** |
2466 | * vb2_mmap() - map video buffers into application address space | |
2467 | * @q: videobuf2 queue | |
2468 | * @vma: vma passed to the mmap file operation handler in the driver | |
2469 | * | |
2470 | * Should be called from mmap file operation handler of a driver. | |
2471 | * This function maps one plane of one of the available video buffers to | |
2472 | * userspace. To map whole video memory allocated on reqbufs, this function | |
2473 | * has to be called once per each plane per each buffer previously allocated. | |
2474 | * | |
2475 | * When the userspace application calls mmap, it passes to it an offset returned | |
2476 | * to it earlier by the means of vidioc_querybuf handler. That offset acts as | |
2477 | * a "cookie", which is then used to identify the plane to be mapped. | |
2478 | * This function finds a plane with a matching offset and a mapping is performed | |
2479 | * by the means of a provided memory operation. | |
2480 | * | |
2481 | * The return values from this function are intended to be directly returned | |
2482 | * from the mmap handler in driver. | |
2483 | */ | |
2484 | int vb2_mmap(struct vb2_queue *q, struct vm_area_struct *vma) | |
2485 | { | |
2486 | unsigned long off = vma->vm_pgoff << PAGE_SHIFT; | |
e23ccc0a | 2487 | struct vb2_buffer *vb; |
ce9c2244 | 2488 | unsigned int buffer = 0, plane = 0; |
e23ccc0a | 2489 | int ret; |
7f841459 | 2490 | unsigned long length; |
e23ccc0a PO |
2491 | |
2492 | if (q->memory != V4L2_MEMORY_MMAP) { | |
3050040b | 2493 | dprintk(1, "queue is not currently set up for mmap\n"); |
e23ccc0a PO |
2494 | return -EINVAL; |
2495 | } | |
2496 | ||
2497 | /* | |
2498 | * Check memory area access mode. | |
2499 | */ | |
2500 | if (!(vma->vm_flags & VM_SHARED)) { | |
3050040b | 2501 | dprintk(1, "invalid vma flags, VM_SHARED needed\n"); |
e23ccc0a PO |
2502 | return -EINVAL; |
2503 | } | |
2504 | if (V4L2_TYPE_IS_OUTPUT(q->type)) { | |
2505 | if (!(vma->vm_flags & VM_WRITE)) { | |
3050040b | 2506 | dprintk(1, "invalid vma flags, VM_WRITE needed\n"); |
e23ccc0a PO |
2507 | return -EINVAL; |
2508 | } | |
2509 | } else { | |
2510 | if (!(vma->vm_flags & VM_READ)) { | |
3050040b | 2511 | dprintk(1, "invalid vma flags, VM_READ needed\n"); |
e23ccc0a PO |
2512 | return -EINVAL; |
2513 | } | |
2514 | } | |
74753cff HV |
2515 | if (vb2_fileio_is_active(q)) { |
2516 | dprintk(1, "mmap: file io in progress\n"); | |
2517 | return -EBUSY; | |
2518 | } | |
e23ccc0a PO |
2519 | |
2520 | /* | |
2521 | * Find the plane corresponding to the offset passed by userspace. | |
2522 | */ | |
2523 | ret = __find_plane_by_offset(q, off, &buffer, &plane); | |
2524 | if (ret) | |
2525 | return ret; | |
2526 | ||
2527 | vb = q->bufs[buffer]; | |
e23ccc0a | 2528 | |
7f841459 MCC |
2529 | /* |
2530 | * MMAP requires page_aligned buffers. | |
2531 | * The buffer length was page_aligned at __vb2_buf_mem_alloc(), | |
2532 | * so, we need to do the same here. | |
2533 | */ | |
2534 | length = PAGE_ALIGN(vb->v4l2_planes[plane].length); | |
2535 | if (length < (vma->vm_end - vma->vm_start)) { | |
2536 | dprintk(1, | |
2537 | "MMAP invalid, as it would overflow buffer length\n"); | |
068a0df7 SWK |
2538 | return -EINVAL; |
2539 | } | |
2540 | ||
f035eb4e | 2541 | mutex_lock(&q->mmap_lock); |
b5b4541e | 2542 | ret = call_memop(vb, mmap, vb->planes[plane].mem_priv, vma); |
f035eb4e | 2543 | mutex_unlock(&q->mmap_lock); |
a1d36d8c | 2544 | if (ret) |
e23ccc0a PO |
2545 | return ret; |
2546 | ||
3050040b | 2547 | dprintk(3, "buffer %d, plane %d successfully mapped\n", buffer, plane); |
e23ccc0a PO |
2548 | return 0; |
2549 | } | |
2550 | EXPORT_SYMBOL_GPL(vb2_mmap); | |
2551 | ||
6f524ec1 SJ |
2552 | #ifndef CONFIG_MMU |
2553 | unsigned long vb2_get_unmapped_area(struct vb2_queue *q, | |
2554 | unsigned long addr, | |
2555 | unsigned long len, | |
2556 | unsigned long pgoff, | |
2557 | unsigned long flags) | |
2558 | { | |
2559 | unsigned long off = pgoff << PAGE_SHIFT; | |
2560 | struct vb2_buffer *vb; | |
2561 | unsigned int buffer, plane; | |
f035eb4e | 2562 | void *vaddr; |
6f524ec1 SJ |
2563 | int ret; |
2564 | ||
2565 | if (q->memory != V4L2_MEMORY_MMAP) { | |
3050040b | 2566 | dprintk(1, "queue is not currently set up for mmap\n"); |
6f524ec1 SJ |
2567 | return -EINVAL; |
2568 | } | |
2569 | ||
2570 | /* | |
2571 | * Find the plane corresponding to the offset passed by userspace. | |
2572 | */ | |
2573 | ret = __find_plane_by_offset(q, off, &buffer, &plane); | |
2574 | if (ret) | |
2575 | return ret; | |
2576 | ||
2577 | vb = q->bufs[buffer]; | |
2578 | ||
f035eb4e HV |
2579 | vaddr = vb2_plane_vaddr(vb, plane); |
2580 | return vaddr ? (unsigned long)vaddr : -EINVAL; | |
6f524ec1 SJ |
2581 | } |
2582 | EXPORT_SYMBOL_GPL(vb2_get_unmapped_area); | |
2583 | #endif | |
2584 | ||
b25748fe MS |
2585 | static int __vb2_init_fileio(struct vb2_queue *q, int read); |
2586 | static int __vb2_cleanup_fileio(struct vb2_queue *q); | |
e23ccc0a PO |
2587 | |
2588 | /** | |
2589 | * vb2_poll() - implements poll userspace operation | |
2590 | * @q: videobuf2 queue | |
2591 | * @file: file argument passed to the poll file operation handler | |
2592 | * @wait: wait argument passed to the poll file operation handler | |
2593 | * | |
2594 | * This function implements poll file operation handler for a driver. | |
2595 | * For CAPTURE queues, if a buffer is ready to be dequeued, the userspace will | |
2596 | * be informed that the file descriptor of a video device is available for | |
2597 | * reading. | |
2598 | * For OUTPUT queues, if a buffer is ready to be dequeued, the file descriptor | |
2599 | * will be reported as available for writing. | |
2600 | * | |
95213ceb HV |
2601 | * If the driver uses struct v4l2_fh, then vb2_poll() will also check for any |
2602 | * pending events. | |
2603 | * | |
e23ccc0a PO |
2604 | * The return values from this function are intended to be directly returned |
2605 | * from poll handler in driver. | |
2606 | */ | |
2607 | unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait) | |
2608 | { | |
95213ceb | 2609 | struct video_device *vfd = video_devdata(file); |
bf5c7cbb | 2610 | unsigned long req_events = poll_requested_events(wait); |
e23ccc0a | 2611 | struct vb2_buffer *vb = NULL; |
95213ceb HV |
2612 | unsigned int res = 0; |
2613 | unsigned long flags; | |
2614 | ||
2615 | if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) { | |
2616 | struct v4l2_fh *fh = file->private_data; | |
2617 | ||
2618 | if (v4l2_event_pending(fh)) | |
2619 | res = POLLPRI; | |
2620 | else if (req_events & POLLPRI) | |
2621 | poll_wait(file, &fh->wait, wait); | |
2622 | } | |
e23ccc0a | 2623 | |
cd13823f HV |
2624 | if (!V4L2_TYPE_IS_OUTPUT(q->type) && !(req_events & (POLLIN | POLLRDNORM))) |
2625 | return res; | |
2626 | if (V4L2_TYPE_IS_OUTPUT(q->type) && !(req_events & (POLLOUT | POLLWRNORM))) | |
2627 | return res; | |
2628 | ||
b25748fe | 2629 | /* |
4ffabdb3 | 2630 | * Start file I/O emulator only if streaming API has not been used yet. |
b25748fe | 2631 | */ |
74753cff | 2632 | if (q->num_buffers == 0 && !vb2_fileio_is_active(q)) { |
bf5c7cbb HV |
2633 | if (!V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_READ) && |
2634 | (req_events & (POLLIN | POLLRDNORM))) { | |
95213ceb HV |
2635 | if (__vb2_init_fileio(q, 1)) |
2636 | return res | POLLERR; | |
b25748fe | 2637 | } |
bf5c7cbb HV |
2638 | if (V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_WRITE) && |
2639 | (req_events & (POLLOUT | POLLWRNORM))) { | |
95213ceb HV |
2640 | if (__vb2_init_fileio(q, 0)) |
2641 | return res | POLLERR; | |
b25748fe MS |
2642 | /* |
2643 | * Write to OUTPUT queue can be done immediately. | |
2644 | */ | |
95213ceb | 2645 | return res | POLLOUT | POLLWRNORM; |
b25748fe MS |
2646 | } |
2647 | } | |
2648 | ||
e23ccc0a | 2649 | /* |
58d75f4b HV |
2650 | * There is nothing to wait for if the queue isn't streaming, or if the |
2651 | * error flag is set. | |
e23ccc0a | 2652 | */ |
58d75f4b HV |
2653 | if (!vb2_is_streaming(q) || q->error) |
2654 | return res | POLLERR; | |
2655 | /* | |
2656 | * For compatibility with vb1: if QBUF hasn't been called yet, then | |
2657 | * return POLLERR as well. This only affects capture queues, output | |
2658 | * queues will always initialize waiting_for_buffers to false. | |
2659 | */ | |
2660 | if (q->waiting_for_buffers) | |
95213ceb | 2661 | return res | POLLERR; |
e23ccc0a | 2662 | |
1612f20e HV |
2663 | /* |
2664 | * For output streams you can write as long as there are fewer buffers | |
2665 | * queued than there are buffers available. | |
2666 | */ | |
2667 | if (V4L2_TYPE_IS_OUTPUT(q->type) && q->queued_count < q->num_buffers) | |
2668 | return res | POLLOUT | POLLWRNORM; | |
2669 | ||
c1621840 PZ |
2670 | if (list_empty(&q->done_list)) { |
2671 | /* | |
2672 | * If the last buffer was dequeued from a capture queue, | |
2673 | * return immediately. DQBUF will return -EPIPE. | |
2674 | */ | |
2675 | if (q->last_buffer_dequeued) | |
2676 | return res | POLLIN | POLLRDNORM; | |
2677 | ||
412cb87d | 2678 | poll_wait(file, &q->done_wq, wait); |
c1621840 | 2679 | } |
e23ccc0a PO |
2680 | |
2681 | /* | |
2682 | * Take first buffer available for dequeuing. | |
2683 | */ | |
2684 | spin_lock_irqsave(&q->done_lock, flags); | |
2685 | if (!list_empty(&q->done_list)) | |
2686 | vb = list_first_entry(&q->done_list, struct vb2_buffer, | |
2687 | done_entry); | |
2688 | spin_unlock_irqrestore(&q->done_lock, flags); | |
2689 | ||
2690 | if (vb && (vb->state == VB2_BUF_STATE_DONE | |
2691 | || vb->state == VB2_BUF_STATE_ERROR)) { | |
95213ceb HV |
2692 | return (V4L2_TYPE_IS_OUTPUT(q->type)) ? |
2693 | res | POLLOUT | POLLWRNORM : | |
2694 | res | POLLIN | POLLRDNORM; | |
e23ccc0a | 2695 | } |
95213ceb | 2696 | return res; |
e23ccc0a PO |
2697 | } |
2698 | EXPORT_SYMBOL_GPL(vb2_poll); | |
2699 | ||
2700 | /** | |
2701 | * vb2_queue_init() - initialize a videobuf2 queue | |
2702 | * @q: videobuf2 queue; this structure should be allocated in driver | |
2703 | * | |
2704 | * The vb2_queue structure should be allocated by the driver. The driver is | |
2705 | * responsible of clearing it's content and setting initial values for some | |
2706 | * required entries before calling this function. | |
2707 | * q->ops, q->mem_ops, q->type and q->io_modes are mandatory. Please refer | |
2708 | * to the struct vb2_queue description in include/media/videobuf2-core.h | |
2709 | * for more information. | |
2710 | */ | |
2711 | int vb2_queue_init(struct vb2_queue *q) | |
2712 | { | |
896f38f5 EG |
2713 | /* |
2714 | * Sanity check | |
2715 | */ | |
2716 | if (WARN_ON(!q) || | |
2717 | WARN_ON(!q->ops) || | |
2718 | WARN_ON(!q->mem_ops) || | |
2719 | WARN_ON(!q->type) || | |
2720 | WARN_ON(!q->io_modes) || | |
2721 | WARN_ON(!q->ops->queue_setup) || | |
6aa69f99 | 2722 | WARN_ON(!q->ops->buf_queue) || |
872484ce SA |
2723 | WARN_ON(q->timestamp_flags & |
2724 | ~(V4L2_BUF_FLAG_TIMESTAMP_MASK | | |
2725 | V4L2_BUF_FLAG_TSTAMP_SRC_MASK))) | |
896f38f5 | 2726 | return -EINVAL; |
e23ccc0a | 2727 | |
6aa69f99 | 2728 | /* Warn that the driver should choose an appropriate timestamp type */ |
c57ff792 SA |
2729 | WARN_ON((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == |
2730 | V4L2_BUF_FLAG_TIMESTAMP_UNKNOWN); | |
6aa69f99 | 2731 | |
e23ccc0a PO |
2732 | INIT_LIST_HEAD(&q->queued_list); |
2733 | INIT_LIST_HEAD(&q->done_list); | |
2734 | spin_lock_init(&q->done_lock); | |
f035eb4e | 2735 | mutex_init(&q->mmap_lock); |
e23ccc0a PO |
2736 | init_waitqueue_head(&q->done_wq); |
2737 | ||
2738 | if (q->buf_struct_size == 0) | |
2739 | q->buf_struct_size = sizeof(struct vb2_buffer); | |
2740 | ||
2741 | return 0; | |
2742 | } | |
2743 | EXPORT_SYMBOL_GPL(vb2_queue_init); | |
2744 | ||
2745 | /** | |
2746 | * vb2_queue_release() - stop streaming, release the queue and free memory | |
2747 | * @q: videobuf2 queue | |
2748 | * | |
2749 | * This function stops streaming and performs necessary clean ups, including | |
2750 | * freeing video buffer memory. The driver is responsible for freeing | |
2751 | * the vb2_queue structure itself. | |
2752 | */ | |
2753 | void vb2_queue_release(struct vb2_queue *q) | |
2754 | { | |
b25748fe | 2755 | __vb2_cleanup_fileio(q); |
e23ccc0a | 2756 | __vb2_queue_cancel(q); |
f035eb4e | 2757 | mutex_lock(&q->mmap_lock); |
2d86401c | 2758 | __vb2_queue_free(q, q->num_buffers); |
f035eb4e | 2759 | mutex_unlock(&q->mmap_lock); |
e23ccc0a PO |
2760 | } |
2761 | EXPORT_SYMBOL_GPL(vb2_queue_release); | |
2762 | ||
b25748fe MS |
2763 | /** |
2764 | * struct vb2_fileio_buf - buffer context used by file io emulator | |
2765 | * | |
2766 | * vb2 provides a compatibility layer and emulator of file io (read and | |
2767 | * write) calls on top of streaming API. This structure is used for | |
2768 | * tracking context related to the buffers. | |
2769 | */ | |
2770 | struct vb2_fileio_buf { | |
2771 | void *vaddr; | |
2772 | unsigned int size; | |
2773 | unsigned int pos; | |
2774 | unsigned int queued:1; | |
2775 | }; | |
2776 | ||
2777 | /** | |
2778 | * struct vb2_fileio_data - queue context used by file io emulator | |
2779 | * | |
4e5a4d8a HV |
2780 | * @cur_index: the index of the buffer currently being read from or |
2781 | * written to. If equal to q->num_buffers then a new buffer | |
2782 | * must be dequeued. | |
2783 | * @initial_index: in the read() case all buffers are queued up immediately | |
2784 | * in __vb2_init_fileio() and __vb2_perform_fileio() just cycles | |
2785 | * buffers. However, in the write() case no buffers are initially | |
2786 | * queued, instead whenever a buffer is full it is queued up by | |
2787 | * __vb2_perform_fileio(). Only once all available buffers have | |
2788 | * been queued up will __vb2_perform_fileio() start to dequeue | |
2789 | * buffers. This means that initially __vb2_perform_fileio() | |
2790 | * needs to know what buffer index to use when it is queuing up | |
2791 | * the buffers for the first time. That initial index is stored | |
2792 | * in this field. Once it is equal to q->num_buffers all | |
2793 | * available buffers have been queued and __vb2_perform_fileio() | |
2794 | * should start the normal dequeue/queue cycle. | |
2795 | * | |
b25748fe MS |
2796 | * vb2 provides a compatibility layer and emulator of file io (read and |
2797 | * write) calls on top of streaming API. For proper operation it required | |
2798 | * this structure to save the driver state between each call of the read | |
2799 | * or write function. | |
2800 | */ | |
2801 | struct vb2_fileio_data { | |
2802 | struct v4l2_requestbuffers req; | |
7bb6edd3 | 2803 | struct v4l2_plane p; |
b25748fe MS |
2804 | struct v4l2_buffer b; |
2805 | struct vb2_fileio_buf bufs[VIDEO_MAX_FRAME]; | |
4e5a4d8a HV |
2806 | unsigned int cur_index; |
2807 | unsigned int initial_index; | |
b25748fe MS |
2808 | unsigned int q_count; |
2809 | unsigned int dq_count; | |
06e7a9b6 KD |
2810 | unsigned read_once:1; |
2811 | unsigned write_immediately:1; | |
b25748fe MS |
2812 | }; |
2813 | ||
2814 | /** | |
2815 | * __vb2_init_fileio() - initialize file io emulator | |
2816 | * @q: videobuf2 queue | |
2817 | * @read: mode selector (1 means read, 0 means write) | |
2818 | */ | |
2819 | static int __vb2_init_fileio(struct vb2_queue *q, int read) | |
2820 | { | |
2821 | struct vb2_fileio_data *fileio; | |
2822 | int i, ret; | |
2823 | unsigned int count = 0; | |
2824 | ||
2825 | /* | |
2826 | * Sanity check | |
2827 | */ | |
e4d25816 HV |
2828 | if (WARN_ON((read && !(q->io_modes & VB2_READ)) || |
2829 | (!read && !(q->io_modes & VB2_WRITE)))) | |
2830 | return -EINVAL; | |
b25748fe MS |
2831 | |
2832 | /* | |
2833 | * Check if device supports mapping buffers to kernel virtual space. | |
2834 | */ | |
2835 | if (!q->mem_ops->vaddr) | |
2836 | return -EBUSY; | |
2837 | ||
2838 | /* | |
2839 | * Check if streaming api has not been already activated. | |
2840 | */ | |
2841 | if (q->streaming || q->num_buffers > 0) | |
2842 | return -EBUSY; | |
2843 | ||
2844 | /* | |
2845 | * Start with count 1, driver can increase it in queue_setup() | |
2846 | */ | |
2847 | count = 1; | |
2848 | ||
06e7a9b6 KD |
2849 | dprintk(3, "setting up file io: mode %s, count %d, read_once %d, write_immediately %d\n", |
2850 | (read) ? "read" : "write", count, q->fileio_read_once, | |
2851 | q->fileio_write_immediately); | |
b25748fe MS |
2852 | |
2853 | fileio = kzalloc(sizeof(struct vb2_fileio_data), GFP_KERNEL); | |
2854 | if (fileio == NULL) | |
2855 | return -ENOMEM; | |
2856 | ||
06e7a9b6 KD |
2857 | fileio->read_once = q->fileio_read_once; |
2858 | fileio->write_immediately = q->fileio_write_immediately; | |
b25748fe MS |
2859 | |
2860 | /* | |
2861 | * Request buffers and use MMAP type to force driver | |
2862 | * to allocate buffers by itself. | |
2863 | */ | |
2864 | fileio->req.count = count; | |
2865 | fileio->req.memory = V4L2_MEMORY_MMAP; | |
2866 | fileio->req.type = q->type; | |
74753cff HV |
2867 | q->fileio = fileio; |
2868 | ret = __reqbufs(q, &fileio->req); | |
b25748fe MS |
2869 | if (ret) |
2870 | goto err_kfree; | |
2871 | ||
2872 | /* | |
2873 | * Check if plane_count is correct | |
2874 | * (multiplane buffers are not supported). | |
2875 | */ | |
2876 | if (q->bufs[0]->num_planes != 1) { | |
b25748fe MS |
2877 | ret = -EBUSY; |
2878 | goto err_reqbufs; | |
2879 | } | |
2880 | ||
2881 | /* | |
2882 | * Get kernel address of each buffer. | |
2883 | */ | |
2884 | for (i = 0; i < q->num_buffers; i++) { | |
2885 | fileio->bufs[i].vaddr = vb2_plane_vaddr(q->bufs[i], 0); | |
5dd6946c WY |
2886 | if (fileio->bufs[i].vaddr == NULL) { |
2887 | ret = -EINVAL; | |
b25748fe | 2888 | goto err_reqbufs; |
5dd6946c | 2889 | } |
b25748fe MS |
2890 | fileio->bufs[i].size = vb2_plane_size(q->bufs[i], 0); |
2891 | } | |
2892 | ||
2893 | /* | |
2894 | * Read mode requires pre queuing of all buffers. | |
2895 | */ | |
2896 | if (read) { | |
7bb6edd3 HV |
2897 | bool is_multiplanar = V4L2_TYPE_IS_MULTIPLANAR(q->type); |
2898 | ||
b25748fe MS |
2899 | /* |
2900 | * Queue all buffers. | |
2901 | */ | |
2902 | for (i = 0; i < q->num_buffers; i++) { | |
2903 | struct v4l2_buffer *b = &fileio->b; | |
7bb6edd3 | 2904 | |
b25748fe MS |
2905 | memset(b, 0, sizeof(*b)); |
2906 | b->type = q->type; | |
7bb6edd3 HV |
2907 | if (is_multiplanar) { |
2908 | memset(&fileio->p, 0, sizeof(fileio->p)); | |
2909 | b->m.planes = &fileio->p; | |
2910 | b->length = 1; | |
2911 | } | |
b25748fe MS |
2912 | b->memory = q->memory; |
2913 | b->index = i; | |
74753cff | 2914 | ret = vb2_internal_qbuf(q, b); |
b25748fe MS |
2915 | if (ret) |
2916 | goto err_reqbufs; | |
2917 | fileio->bufs[i].queued = 1; | |
2918 | } | |
4e5a4d8a HV |
2919 | /* |
2920 | * All buffers have been queued, so mark that by setting | |
2921 | * initial_index to q->num_buffers | |
2922 | */ | |
2923 | fileio->initial_index = q->num_buffers; | |
2924 | fileio->cur_index = q->num_buffers; | |
b25748fe MS |
2925 | } |
2926 | ||
02f142ec HV |
2927 | /* |
2928 | * Start streaming. | |
2929 | */ | |
74753cff | 2930 | ret = vb2_internal_streamon(q, q->type); |
02f142ec HV |
2931 | if (ret) |
2932 | goto err_reqbufs; | |
2933 | ||
b25748fe MS |
2934 | return ret; |
2935 | ||
2936 | err_reqbufs: | |
a67e1722 | 2937 | fileio->req.count = 0; |
74753cff | 2938 | __reqbufs(q, &fileio->req); |
b25748fe MS |
2939 | |
2940 | err_kfree: | |
74753cff | 2941 | q->fileio = NULL; |
b25748fe MS |
2942 | kfree(fileio); |
2943 | return ret; | |
2944 | } | |
2945 | ||
2946 | /** | |
2947 | * __vb2_cleanup_fileio() - free resourced used by file io emulator | |
2948 | * @q: videobuf2 queue | |
2949 | */ | |
2950 | static int __vb2_cleanup_fileio(struct vb2_queue *q) | |
2951 | { | |
2952 | struct vb2_fileio_data *fileio = q->fileio; | |
2953 | ||
2954 | if (fileio) { | |
b2f2f047 | 2955 | vb2_internal_streamoff(q, q->type); |
b25748fe | 2956 | q->fileio = NULL; |
b25748fe MS |
2957 | fileio->req.count = 0; |
2958 | vb2_reqbufs(q, &fileio->req); | |
2959 | kfree(fileio); | |
2960 | dprintk(3, "file io emulator closed\n"); | |
2961 | } | |
2962 | return 0; | |
2963 | } | |
2964 | ||
2965 | /** | |
2966 | * __vb2_perform_fileio() - perform a single file io (read or write) operation | |
2967 | * @q: videobuf2 queue | |
2968 | * @data: pointed to target userspace buffer | |
2969 | * @count: number of bytes to read or write | |
2970 | * @ppos: file handle position tracking pointer | |
2971 | * @nonblock: mode selector (1 means blocking calls, 0 means nonblocking) | |
2972 | * @read: access mode selector (1 means read, 0 means write) | |
2973 | */ | |
2974 | static size_t __vb2_perform_fileio(struct vb2_queue *q, char __user *data, size_t count, | |
2975 | loff_t *ppos, int nonblock, int read) | |
2976 | { | |
2977 | struct vb2_fileio_data *fileio; | |
2978 | struct vb2_fileio_buf *buf; | |
7bb6edd3 | 2979 | bool is_multiplanar = V4L2_TYPE_IS_MULTIPLANAR(q->type); |
ebd7c505 HV |
2980 | /* |
2981 | * When using write() to write data to an output video node the vb2 core | |
2982 | * should set timestamps if V4L2_BUF_FLAG_TIMESTAMP_COPY is set. Nobody | |
2983 | * else is able to provide this information with the write() operation. | |
2984 | */ | |
2985 | bool set_timestamp = !read && | |
2986 | (q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == | |
2987 | V4L2_BUF_FLAG_TIMESTAMP_COPY; | |
b25748fe MS |
2988 | int ret, index; |
2989 | ||
fd4354cf | 2990 | dprintk(3, "mode %s, offset %ld, count %zd, %sblocking\n", |
b25748fe MS |
2991 | read ? "read" : "write", (long)*ppos, count, |
2992 | nonblock ? "non" : ""); | |
2993 | ||
2994 | if (!data) | |
2995 | return -EINVAL; | |
2996 | ||
2997 | /* | |
2998 | * Initialize emulator on first call. | |
2999 | */ | |
74753cff | 3000 | if (!vb2_fileio_is_active(q)) { |
b25748fe | 3001 | ret = __vb2_init_fileio(q, read); |
fd4354cf | 3002 | dprintk(3, "vb2_init_fileio result: %d\n", ret); |
b25748fe MS |
3003 | if (ret) |
3004 | return ret; | |
3005 | } | |
3006 | fileio = q->fileio; | |
3007 | ||
b25748fe MS |
3008 | /* |
3009 | * Check if we need to dequeue the buffer. | |
3010 | */ | |
4e5a4d8a | 3011 | index = fileio->cur_index; |
88e26870 | 3012 | if (index >= q->num_buffers) { |
b25748fe MS |
3013 | /* |
3014 | * Call vb2_dqbuf to get buffer back. | |
3015 | */ | |
3016 | memset(&fileio->b, 0, sizeof(fileio->b)); | |
3017 | fileio->b.type = q->type; | |
3018 | fileio->b.memory = q->memory; | |
7bb6edd3 HV |
3019 | if (is_multiplanar) { |
3020 | memset(&fileio->p, 0, sizeof(fileio->p)); | |
3021 | fileio->b.m.planes = &fileio->p; | |
3022 | fileio->b.length = 1; | |
3023 | } | |
b2f2f047 | 3024 | ret = vb2_internal_dqbuf(q, &fileio->b, nonblock); |
fd4354cf | 3025 | dprintk(5, "vb2_dqbuf result: %d\n", ret); |
b25748fe | 3026 | if (ret) |
b2f2f047 | 3027 | return ret; |
b25748fe MS |
3028 | fileio->dq_count += 1; |
3029 | ||
4e5a4d8a | 3030 | fileio->cur_index = index = fileio->b.index; |
88e26870 HV |
3031 | buf = &fileio->bufs[index]; |
3032 | ||
b25748fe MS |
3033 | /* |
3034 | * Get number of bytes filled by the driver | |
3035 | */ | |
88e26870 | 3036 | buf->pos = 0; |
b25748fe | 3037 | buf->queued = 0; |
88e26870 HV |
3038 | buf->size = read ? vb2_get_plane_payload(q->bufs[index], 0) |
3039 | : vb2_plane_size(q->bufs[index], 0); | |
529a53c6 HV |
3040 | /* Compensate for data_offset on read in the multiplanar case. */ |
3041 | if (is_multiplanar && read && | |
3042 | fileio->b.m.planes[0].data_offset < buf->size) { | |
3043 | buf->pos = fileio->b.m.planes[0].data_offset; | |
3044 | buf->size -= buf->pos; | |
3045 | } | |
88e26870 HV |
3046 | } else { |
3047 | buf = &fileio->bufs[index]; | |
b25748fe MS |
3048 | } |
3049 | ||
3050 | /* | |
3051 | * Limit count on last few bytes of the buffer. | |
3052 | */ | |
3053 | if (buf->pos + count > buf->size) { | |
3054 | count = buf->size - buf->pos; | |
08b99e26 | 3055 | dprintk(5, "reducing read count: %zd\n", count); |
b25748fe MS |
3056 | } |
3057 | ||
3058 | /* | |
3059 | * Transfer data to userspace. | |
3060 | */ | |
fd4354cf | 3061 | dprintk(3, "copying %zd bytes - buffer %d, offset %u\n", |
b25748fe MS |
3062 | count, index, buf->pos); |
3063 | if (read) | |
3064 | ret = copy_to_user(data, buf->vaddr + buf->pos, count); | |
3065 | else | |
3066 | ret = copy_from_user(buf->vaddr + buf->pos, data, count); | |
3067 | if (ret) { | |
fd4354cf | 3068 | dprintk(3, "error copying data\n"); |
b2f2f047 | 3069 | return -EFAULT; |
b25748fe MS |
3070 | } |
3071 | ||
3072 | /* | |
3073 | * Update counters. | |
3074 | */ | |
3075 | buf->pos += count; | |
3076 | *ppos += count; | |
3077 | ||
3078 | /* | |
3079 | * Queue next buffer if required. | |
3080 | */ | |
06e7a9b6 | 3081 | if (buf->pos == buf->size || (!read && fileio->write_immediately)) { |
b25748fe MS |
3082 | /* |
3083 | * Check if this is the last buffer to read. | |
3084 | */ | |
06e7a9b6 | 3085 | if (read && fileio->read_once && fileio->dq_count == 1) { |
fd4354cf | 3086 | dprintk(3, "read limit reached\n"); |
b25748fe MS |
3087 | return __vb2_cleanup_fileio(q); |
3088 | } | |
3089 | ||
3090 | /* | |
3091 | * Call vb2_qbuf and give buffer to the driver. | |
3092 | */ | |
3093 | memset(&fileio->b, 0, sizeof(fileio->b)); | |
3094 | fileio->b.type = q->type; | |
3095 | fileio->b.memory = q->memory; | |
3096 | fileio->b.index = index; | |
3097 | fileio->b.bytesused = buf->pos; | |
7bb6edd3 HV |
3098 | if (is_multiplanar) { |
3099 | memset(&fileio->p, 0, sizeof(fileio->p)); | |
3100 | fileio->p.bytesused = buf->pos; | |
3101 | fileio->b.m.planes = &fileio->p; | |
3102 | fileio->b.length = 1; | |
3103 | } | |
ebd7c505 HV |
3104 | if (set_timestamp) |
3105 | v4l2_get_timestamp(&fileio->b.timestamp); | |
b2f2f047 | 3106 | ret = vb2_internal_qbuf(q, &fileio->b); |
fd4354cf | 3107 | dprintk(5, "vb2_dbuf result: %d\n", ret); |
b25748fe | 3108 | if (ret) |
b2f2f047 | 3109 | return ret; |
b25748fe MS |
3110 | |
3111 | /* | |
3112 | * Buffer has been queued, update the status | |
3113 | */ | |
3114 | buf->pos = 0; | |
3115 | buf->queued = 1; | |
88e26870 | 3116 | buf->size = vb2_plane_size(q->bufs[index], 0); |
b25748fe | 3117 | fileio->q_count += 1; |
4e5a4d8a HV |
3118 | /* |
3119 | * If we are queuing up buffers for the first time, then | |
3120 | * increase initial_index by one. | |
3121 | */ | |
3122 | if (fileio->initial_index < q->num_buffers) | |
3123 | fileio->initial_index++; | |
3124 | /* | |
3125 | * The next buffer to use is either a buffer that's going to be | |
3126 | * queued for the first time (initial_index < q->num_buffers) | |
3127 | * or it is equal to q->num_buffers, meaning that the next | |
3128 | * time we need to dequeue a buffer since we've now queued up | |
3129 | * all the 'first time' buffers. | |
3130 | */ | |
3131 | fileio->cur_index = fileio->initial_index; | |
b25748fe MS |
3132 | } |
3133 | ||
3134 | /* | |
3135 | * Return proper number of bytes processed. | |
3136 | */ | |
3137 | if (ret == 0) | |
3138 | ret = count; | |
b25748fe MS |
3139 | return ret; |
3140 | } | |
3141 | ||
3142 | size_t vb2_read(struct vb2_queue *q, char __user *data, size_t count, | |
3143 | loff_t *ppos, int nonblocking) | |
3144 | { | |
3145 | return __vb2_perform_fileio(q, data, count, ppos, nonblocking, 1); | |
3146 | } | |
3147 | EXPORT_SYMBOL_GPL(vb2_read); | |
3148 | ||
819585bc | 3149 | size_t vb2_write(struct vb2_queue *q, const char __user *data, size_t count, |
b25748fe MS |
3150 | loff_t *ppos, int nonblocking) |
3151 | { | |
819585bc RR |
3152 | return __vb2_perform_fileio(q, (char __user *) data, count, |
3153 | ppos, nonblocking, 0); | |
b25748fe MS |
3154 | } |
3155 | EXPORT_SYMBOL_GPL(vb2_write); | |
3156 | ||
3415a89f HV |
3157 | struct vb2_threadio_data { |
3158 | struct task_struct *thread; | |
3159 | vb2_thread_fnc fnc; | |
3160 | void *priv; | |
3161 | bool stop; | |
3162 | }; | |
3163 | ||
3164 | static int vb2_thread(void *data) | |
3165 | { | |
3166 | struct vb2_queue *q = data; | |
3167 | struct vb2_threadio_data *threadio = q->threadio; | |
3168 | struct vb2_fileio_data *fileio = q->fileio; | |
3169 | bool set_timestamp = false; | |
3170 | int prequeue = 0; | |
3171 | int index = 0; | |
3172 | int ret = 0; | |
3173 | ||
3174 | if (V4L2_TYPE_IS_OUTPUT(q->type)) { | |
3175 | prequeue = q->num_buffers; | |
3176 | set_timestamp = | |
3177 | (q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == | |
3178 | V4L2_BUF_FLAG_TIMESTAMP_COPY; | |
3179 | } | |
3180 | ||
3181 | set_freezable(); | |
3182 | ||
3183 | for (;;) { | |
3184 | struct vb2_buffer *vb; | |
3185 | ||
3186 | /* | |
3187 | * Call vb2_dqbuf to get buffer back. | |
3188 | */ | |
3189 | memset(&fileio->b, 0, sizeof(fileio->b)); | |
3190 | fileio->b.type = q->type; | |
3191 | fileio->b.memory = q->memory; | |
3192 | if (prequeue) { | |
3193 | fileio->b.index = index++; | |
3194 | prequeue--; | |
3195 | } else { | |
3196 | call_void_qop(q, wait_finish, q); | |
6cf11ee6 HV |
3197 | if (!threadio->stop) |
3198 | ret = vb2_internal_dqbuf(q, &fileio->b, 0); | |
3415a89f HV |
3199 | call_void_qop(q, wait_prepare, q); |
3200 | dprintk(5, "file io: vb2_dqbuf result: %d\n", ret); | |
3201 | } | |
6cf11ee6 | 3202 | if (ret || threadio->stop) |
3415a89f HV |
3203 | break; |
3204 | try_to_freeze(); | |
3205 | ||
3206 | vb = q->bufs[fileio->b.index]; | |
3207 | if (!(fileio->b.flags & V4L2_BUF_FLAG_ERROR)) | |
6cf11ee6 HV |
3208 | if (threadio->fnc(vb, threadio->priv)) |
3209 | break; | |
3415a89f HV |
3210 | call_void_qop(q, wait_finish, q); |
3211 | if (set_timestamp) | |
3212 | v4l2_get_timestamp(&fileio->b.timestamp); | |
6cf11ee6 HV |
3213 | if (!threadio->stop) |
3214 | ret = vb2_internal_qbuf(q, &fileio->b); | |
3415a89f | 3215 | call_void_qop(q, wait_prepare, q); |
6cf11ee6 | 3216 | if (ret || threadio->stop) |
3415a89f HV |
3217 | break; |
3218 | } | |
3219 | ||
3220 | /* Hmm, linux becomes *very* unhappy without this ... */ | |
3221 | while (!kthread_should_stop()) { | |
3222 | set_current_state(TASK_INTERRUPTIBLE); | |
3223 | schedule(); | |
3224 | } | |
3225 | return 0; | |
3226 | } | |
3227 | ||
3228 | /* | |
3229 | * This function should not be used for anything else but the videobuf2-dvb | |
3230 | * support. If you think you have another good use-case for this, then please | |
3231 | * contact the linux-media mailinglist first. | |
3232 | */ | |
3233 | int vb2_thread_start(struct vb2_queue *q, vb2_thread_fnc fnc, void *priv, | |
3234 | const char *thread_name) | |
3235 | { | |
3236 | struct vb2_threadio_data *threadio; | |
3237 | int ret = 0; | |
3238 | ||
3239 | if (q->threadio) | |
3240 | return -EBUSY; | |
3241 | if (vb2_is_busy(q)) | |
3242 | return -EBUSY; | |
3243 | if (WARN_ON(q->fileio)) | |
3244 | return -EBUSY; | |
3245 | ||
3246 | threadio = kzalloc(sizeof(*threadio), GFP_KERNEL); | |
3247 | if (threadio == NULL) | |
3248 | return -ENOMEM; | |
3249 | threadio->fnc = fnc; | |
3250 | threadio->priv = priv; | |
3251 | ||
3252 | ret = __vb2_init_fileio(q, !V4L2_TYPE_IS_OUTPUT(q->type)); | |
3253 | dprintk(3, "file io: vb2_init_fileio result: %d\n", ret); | |
3254 | if (ret) | |
3255 | goto nomem; | |
3256 | q->threadio = threadio; | |
3257 | threadio->thread = kthread_run(vb2_thread, q, "vb2-%s", thread_name); | |
3258 | if (IS_ERR(threadio->thread)) { | |
3259 | ret = PTR_ERR(threadio->thread); | |
3260 | threadio->thread = NULL; | |
3261 | goto nothread; | |
3262 | } | |
3263 | return 0; | |
3264 | ||
3265 | nothread: | |
3266 | __vb2_cleanup_fileio(q); | |
3267 | nomem: | |
3268 | kfree(threadio); | |
3269 | return ret; | |
3270 | } | |
3271 | EXPORT_SYMBOL_GPL(vb2_thread_start); | |
3272 | ||
3273 | int vb2_thread_stop(struct vb2_queue *q) | |
3274 | { | |
3275 | struct vb2_threadio_data *threadio = q->threadio; | |
3415a89f HV |
3276 | int err; |
3277 | ||
3278 | if (threadio == NULL) | |
3279 | return 0; | |
3415a89f | 3280 | threadio->stop = true; |
0e661006 HV |
3281 | /* Wake up all pending sleeps in the thread */ |
3282 | vb2_queue_error(q); | |
6cf11ee6 | 3283 | err = kthread_stop(threadio->thread); |
0e661006 | 3284 | __vb2_cleanup_fileio(q); |
3415a89f HV |
3285 | threadio->thread = NULL; |
3286 | kfree(threadio); | |
3415a89f HV |
3287 | q->threadio = NULL; |
3288 | return err; | |
3289 | } | |
3290 | EXPORT_SYMBOL_GPL(vb2_thread_stop); | |
4c1ffcaa HV |
3291 | |
3292 | /* | |
3293 | * The following functions are not part of the vb2 core API, but are helper | |
3294 | * functions that plug into struct v4l2_ioctl_ops, struct v4l2_file_operations | |
3295 | * and struct vb2_ops. | |
3296 | * They contain boilerplate code that most if not all drivers have to do | |
3297 | * and so they simplify the driver code. | |
3298 | */ | |
3299 | ||
3300 | /* The queue is busy if there is a owner and you are not that owner. */ | |
3301 | static inline bool vb2_queue_is_busy(struct video_device *vdev, struct file *file) | |
3302 | { | |
3303 | return vdev->queue->owner && vdev->queue->owner != file->private_data; | |
3304 | } | |
3305 | ||
3306 | /* vb2 ioctl helpers */ | |
3307 | ||
3308 | int vb2_ioctl_reqbufs(struct file *file, void *priv, | |
3309 | struct v4l2_requestbuffers *p) | |
3310 | { | |
3311 | struct video_device *vdev = video_devdata(file); | |
3312 | int res = __verify_memory_type(vdev->queue, p->memory, p->type); | |
3313 | ||
3314 | if (res) | |
3315 | return res; | |
3316 | if (vb2_queue_is_busy(vdev, file)) | |
3317 | return -EBUSY; | |
3318 | res = __reqbufs(vdev->queue, p); | |
3319 | /* If count == 0, then the owner has released all buffers and he | |
3320 | is no longer owner of the queue. Otherwise we have a new owner. */ | |
3321 | if (res == 0) | |
3322 | vdev->queue->owner = p->count ? file->private_data : NULL; | |
3323 | return res; | |
3324 | } | |
3325 | EXPORT_SYMBOL_GPL(vb2_ioctl_reqbufs); | |
3326 | ||
3327 | int vb2_ioctl_create_bufs(struct file *file, void *priv, | |
3328 | struct v4l2_create_buffers *p) | |
3329 | { | |
3330 | struct video_device *vdev = video_devdata(file); | |
3331 | int res = __verify_memory_type(vdev->queue, p->memory, p->format.type); | |
3332 | ||
3333 | p->index = vdev->queue->num_buffers; | |
3334 | /* If count == 0, then just check if memory and type are valid. | |
3335 | Any -EBUSY result from __verify_memory_type can be mapped to 0. */ | |
3336 | if (p->count == 0) | |
3337 | return res != -EBUSY ? res : 0; | |
3338 | if (res) | |
3339 | return res; | |
3340 | if (vb2_queue_is_busy(vdev, file)) | |
3341 | return -EBUSY; | |
3342 | res = __create_bufs(vdev->queue, p); | |
3343 | if (res == 0) | |
3344 | vdev->queue->owner = file->private_data; | |
3345 | return res; | |
3346 | } | |
3347 | EXPORT_SYMBOL_GPL(vb2_ioctl_create_bufs); | |
3348 | ||
3349 | int vb2_ioctl_prepare_buf(struct file *file, void *priv, | |
3350 | struct v4l2_buffer *p) | |
3351 | { | |
3352 | struct video_device *vdev = video_devdata(file); | |
3353 | ||
3354 | if (vb2_queue_is_busy(vdev, file)) | |
3355 | return -EBUSY; | |
3356 | return vb2_prepare_buf(vdev->queue, p); | |
3357 | } | |
3358 | EXPORT_SYMBOL_GPL(vb2_ioctl_prepare_buf); | |
3359 | ||
3360 | int vb2_ioctl_querybuf(struct file *file, void *priv, struct v4l2_buffer *p) | |
3361 | { | |
3362 | struct video_device *vdev = video_devdata(file); | |
3363 | ||
3364 | /* No need to call vb2_queue_is_busy(), anyone can query buffers. */ | |
3365 | return vb2_querybuf(vdev->queue, p); | |
3366 | } | |
3367 | EXPORT_SYMBOL_GPL(vb2_ioctl_querybuf); | |
3368 | ||
3369 | int vb2_ioctl_qbuf(struct file *file, void *priv, struct v4l2_buffer *p) | |
3370 | { | |
3371 | struct video_device *vdev = video_devdata(file); | |
3372 | ||
3373 | if (vb2_queue_is_busy(vdev, file)) | |
3374 | return -EBUSY; | |
3375 | return vb2_qbuf(vdev->queue, p); | |
3376 | } | |
3377 | EXPORT_SYMBOL_GPL(vb2_ioctl_qbuf); | |
3378 | ||
3379 | int vb2_ioctl_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p) | |
3380 | { | |
3381 | struct video_device *vdev = video_devdata(file); | |
3382 | ||
3383 | if (vb2_queue_is_busy(vdev, file)) | |
3384 | return -EBUSY; | |
3385 | return vb2_dqbuf(vdev->queue, p, file->f_flags & O_NONBLOCK); | |
3386 | } | |
3387 | EXPORT_SYMBOL_GPL(vb2_ioctl_dqbuf); | |
3388 | ||
3389 | int vb2_ioctl_streamon(struct file *file, void *priv, enum v4l2_buf_type i) | |
3390 | { | |
3391 | struct video_device *vdev = video_devdata(file); | |
3392 | ||
3393 | if (vb2_queue_is_busy(vdev, file)) | |
3394 | return -EBUSY; | |
3395 | return vb2_streamon(vdev->queue, i); | |
3396 | } | |
3397 | EXPORT_SYMBOL_GPL(vb2_ioctl_streamon); | |
3398 | ||
3399 | int vb2_ioctl_streamoff(struct file *file, void *priv, enum v4l2_buf_type i) | |
3400 | { | |
3401 | struct video_device *vdev = video_devdata(file); | |
3402 | ||
3403 | if (vb2_queue_is_busy(vdev, file)) | |
3404 | return -EBUSY; | |
3405 | return vb2_streamoff(vdev->queue, i); | |
3406 | } | |
3407 | EXPORT_SYMBOL_GPL(vb2_ioctl_streamoff); | |
3408 | ||
83ae7c5a TS |
3409 | int vb2_ioctl_expbuf(struct file *file, void *priv, struct v4l2_exportbuffer *p) |
3410 | { | |
3411 | struct video_device *vdev = video_devdata(file); | |
3412 | ||
3413 | if (vb2_queue_is_busy(vdev, file)) | |
3414 | return -EBUSY; | |
3415 | return vb2_expbuf(vdev->queue, p); | |
3416 | } | |
3417 | EXPORT_SYMBOL_GPL(vb2_ioctl_expbuf); | |
3418 | ||
4c1ffcaa HV |
3419 | /* v4l2_file_operations helpers */ |
3420 | ||
3421 | int vb2_fop_mmap(struct file *file, struct vm_area_struct *vma) | |
3422 | { | |
3423 | struct video_device *vdev = video_devdata(file); | |
3424 | ||
f035eb4e | 3425 | return vb2_mmap(vdev->queue, vma); |
4c1ffcaa HV |
3426 | } |
3427 | EXPORT_SYMBOL_GPL(vb2_fop_mmap); | |
3428 | ||
1380f575 | 3429 | int _vb2_fop_release(struct file *file, struct mutex *lock) |
4c1ffcaa HV |
3430 | { |
3431 | struct video_device *vdev = video_devdata(file); | |
3432 | ||
69c0e9c5 LP |
3433 | if (lock) |
3434 | mutex_lock(lock); | |
4c1ffcaa HV |
3435 | if (file->private_data == vdev->queue->owner) { |
3436 | vb2_queue_release(vdev->queue); | |
3437 | vdev->queue->owner = NULL; | |
3438 | } | |
69c0e9c5 LP |
3439 | if (lock) |
3440 | mutex_unlock(lock); | |
4c1ffcaa HV |
3441 | return v4l2_fh_release(file); |
3442 | } | |
1380f575 RR |
3443 | EXPORT_SYMBOL_GPL(_vb2_fop_release); |
3444 | ||
3445 | int vb2_fop_release(struct file *file) | |
3446 | { | |
3447 | struct video_device *vdev = video_devdata(file); | |
3448 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; | |
3449 | ||
3450 | return _vb2_fop_release(file, lock); | |
3451 | } | |
4c1ffcaa HV |
3452 | EXPORT_SYMBOL_GPL(vb2_fop_release); |
3453 | ||
819585bc | 3454 | ssize_t vb2_fop_write(struct file *file, const char __user *buf, |
4c1ffcaa HV |
3455 | size_t count, loff_t *ppos) |
3456 | { | |
3457 | struct video_device *vdev = video_devdata(file); | |
3458 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; | |
4c1ffcaa HV |
3459 | int err = -EBUSY; |
3460 | ||
ff05cb4b HV |
3461 | if (!(vdev->queue->io_modes & VB2_WRITE)) |
3462 | return -EINVAL; | |
cf533735 | 3463 | if (lock && mutex_lock_interruptible(lock)) |
4c1ffcaa HV |
3464 | return -ERESTARTSYS; |
3465 | if (vb2_queue_is_busy(vdev, file)) | |
3466 | goto exit; | |
3467 | err = vb2_write(vdev->queue, buf, count, ppos, | |
3468 | file->f_flags & O_NONBLOCK); | |
8c82c75c | 3469 | if (vdev->queue->fileio) |
4c1ffcaa HV |
3470 | vdev->queue->owner = file->private_data; |
3471 | exit: | |
cf533735 | 3472 | if (lock) |
4c1ffcaa HV |
3473 | mutex_unlock(lock); |
3474 | return err; | |
3475 | } | |
3476 | EXPORT_SYMBOL_GPL(vb2_fop_write); | |
3477 | ||
3478 | ssize_t vb2_fop_read(struct file *file, char __user *buf, | |
3479 | size_t count, loff_t *ppos) | |
3480 | { | |
3481 | struct video_device *vdev = video_devdata(file); | |
3482 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; | |
4c1ffcaa HV |
3483 | int err = -EBUSY; |
3484 | ||
ff05cb4b HV |
3485 | if (!(vdev->queue->io_modes & VB2_READ)) |
3486 | return -EINVAL; | |
cf533735 | 3487 | if (lock && mutex_lock_interruptible(lock)) |
4c1ffcaa HV |
3488 | return -ERESTARTSYS; |
3489 | if (vb2_queue_is_busy(vdev, file)) | |
3490 | goto exit; | |
3491 | err = vb2_read(vdev->queue, buf, count, ppos, | |
3492 | file->f_flags & O_NONBLOCK); | |
8c82c75c | 3493 | if (vdev->queue->fileio) |
4c1ffcaa HV |
3494 | vdev->queue->owner = file->private_data; |
3495 | exit: | |
cf533735 | 3496 | if (lock) |
4c1ffcaa HV |
3497 | mutex_unlock(lock); |
3498 | return err; | |
3499 | } | |
3500 | EXPORT_SYMBOL_GPL(vb2_fop_read); | |
3501 | ||
3502 | unsigned int vb2_fop_poll(struct file *file, poll_table *wait) | |
3503 | { | |
3504 | struct video_device *vdev = video_devdata(file); | |
3505 | struct vb2_queue *q = vdev->queue; | |
3506 | struct mutex *lock = q->lock ? q->lock : vdev->lock; | |
4c1ffcaa HV |
3507 | unsigned res; |
3508 | void *fileio; | |
4c1ffcaa | 3509 | |
f6cee188 LP |
3510 | /* |
3511 | * If this helper doesn't know how to lock, then you shouldn't be using | |
3512 | * it but you should write your own. | |
3513 | */ | |
3514 | WARN_ON(!lock); | |
4c1ffcaa | 3515 | |
f6cee188 | 3516 | if (lock && mutex_lock_interruptible(lock)) |
4c1ffcaa HV |
3517 | return POLLERR; |
3518 | ||
3519 | fileio = q->fileio; | |
3520 | ||
3521 | res = vb2_poll(vdev->queue, file, wait); | |
3522 | ||
3523 | /* If fileio was started, then we have a new queue owner. */ | |
f6cee188 | 3524 | if (!fileio && q->fileio) |
4c1ffcaa | 3525 | q->owner = file->private_data; |
f6cee188 | 3526 | if (lock) |
4c1ffcaa HV |
3527 | mutex_unlock(lock); |
3528 | return res; | |
3529 | } | |
3530 | EXPORT_SYMBOL_GPL(vb2_fop_poll); | |
3531 | ||
3532 | #ifndef CONFIG_MMU | |
3533 | unsigned long vb2_fop_get_unmapped_area(struct file *file, unsigned long addr, | |
3534 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
3535 | { | |
3536 | struct video_device *vdev = video_devdata(file); | |
3537 | ||
f035eb4e | 3538 | return vb2_get_unmapped_area(vdev->queue, addr, len, pgoff, flags); |
4c1ffcaa HV |
3539 | } |
3540 | EXPORT_SYMBOL_GPL(vb2_fop_get_unmapped_area); | |
3541 | #endif | |
3542 | ||
3543 | /* vb2_ops helpers. Only use if vq->lock is non-NULL. */ | |
3544 | ||
3545 | void vb2_ops_wait_prepare(struct vb2_queue *vq) | |
3546 | { | |
3547 | mutex_unlock(vq->lock); | |
3548 | } | |
3549 | EXPORT_SYMBOL_GPL(vb2_ops_wait_prepare); | |
3550 | ||
3551 | void vb2_ops_wait_finish(struct vb2_queue *vq) | |
3552 | { | |
3553 | mutex_lock(vq->lock); | |
3554 | } | |
3555 | EXPORT_SYMBOL_GPL(vb2_ops_wait_finish); | |
3556 | ||
e23ccc0a | 3557 | MODULE_DESCRIPTION("Driver helper framework for Video for Linux 2"); |
95072084 | 3558 | MODULE_AUTHOR("Pawel Osciak <pawel@osciak.com>, Marek Szyprowski"); |
e23ccc0a | 3559 | MODULE_LICENSE("GPL"); |