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 | ||
2091f518 PZ |
33 | #include <trace/events/v4l2.h> |
34 | ||
e23ccc0a PO |
35 | static int debug; |
36 | module_param(debug, int, 0644); | |
37 | ||
fd4354cf HV |
38 | #define dprintk(level, fmt, arg...) \ |
39 | do { \ | |
40 | if (debug >= level) \ | |
0821344d | 41 | pr_info("vb2: %s: " fmt, __func__, ## arg); \ |
e23ccc0a PO |
42 | } while (0) |
43 | ||
b5b4541e HV |
44 | #ifdef CONFIG_VIDEO_ADV_DEBUG |
45 | ||
46 | /* | |
a1d36d8c HV |
47 | * If advanced debugging is on, then count how often each op is called |
48 | * successfully, which can either be per-buffer or per-queue. | |
b5b4541e | 49 | * |
a1d36d8c | 50 | * This makes it easy to check that the 'init' and 'cleanup' |
b5b4541e HV |
51 | * (and variations thereof) stay balanced. |
52 | */ | |
53 | ||
a1d36d8c HV |
54 | #define log_memop(vb, op) \ |
55 | dprintk(2, "call_memop(%p, %d, %s)%s\n", \ | |
56 | (vb)->vb2_queue, (vb)->v4l2_buf.index, #op, \ | |
57 | (vb)->vb2_queue->mem_ops->op ? "" : " (nop)") | |
58 | ||
b5b4541e HV |
59 | #define call_memop(vb, op, args...) \ |
60 | ({ \ | |
61 | struct vb2_queue *_q = (vb)->vb2_queue; \ | |
a1d36d8c HV |
62 | int err; \ |
63 | \ | |
64 | log_memop(vb, op); \ | |
65 | err = _q->mem_ops->op ? _q->mem_ops->op(args) : 0; \ | |
66 | if (!err) \ | |
67 | (vb)->cnt_mem_ ## op++; \ | |
68 | err; \ | |
69 | }) | |
70 | ||
71 | #define call_ptr_memop(vb, op, args...) \ | |
72 | ({ \ | |
73 | struct vb2_queue *_q = (vb)->vb2_queue; \ | |
74 | void *ptr; \ | |
75 | \ | |
76 | log_memop(vb, op); \ | |
77 | ptr = _q->mem_ops->op ? _q->mem_ops->op(args) : NULL; \ | |
78 | if (!IS_ERR_OR_NULL(ptr)) \ | |
79 | (vb)->cnt_mem_ ## op++; \ | |
80 | ptr; \ | |
81 | }) | |
82 | ||
83 | #define call_void_memop(vb, op, args...) \ | |
84 | ({ \ | |
85 | struct vb2_queue *_q = (vb)->vb2_queue; \ | |
86 | \ | |
87 | log_memop(vb, op); \ | |
88 | if (_q->mem_ops->op) \ | |
89 | _q->mem_ops->op(args); \ | |
b5b4541e | 90 | (vb)->cnt_mem_ ## op++; \ |
b5b4541e | 91 | }) |
a1d36d8c HV |
92 | |
93 | #define log_qop(q, op) \ | |
94 | dprintk(2, "call_qop(%p, %s)%s\n", q, #op, \ | |
95 | (q)->ops->op ? "" : " (nop)") | |
b5b4541e HV |
96 | |
97 | #define call_qop(q, op, args...) \ | |
98 | ({ \ | |
a1d36d8c HV |
99 | int err; \ |
100 | \ | |
101 | log_qop(q, op); \ | |
102 | err = (q)->ops->op ? (q)->ops->op(args) : 0; \ | |
103 | if (!err) \ | |
104 | (q)->cnt_ ## op++; \ | |
105 | err; \ | |
106 | }) | |
107 | ||
108 | #define call_void_qop(q, op, args...) \ | |
109 | ({ \ | |
110 | log_qop(q, op); \ | |
111 | if ((q)->ops->op) \ | |
112 | (q)->ops->op(args); \ | |
b5b4541e | 113 | (q)->cnt_ ## op++; \ |
b5b4541e | 114 | }) |
a1d36d8c HV |
115 | |
116 | #define log_vb_qop(vb, op, args...) \ | |
117 | dprintk(2, "call_vb_qop(%p, %d, %s)%s\n", \ | |
118 | (vb)->vb2_queue, (vb)->v4l2_buf.index, #op, \ | |
119 | (vb)->vb2_queue->ops->op ? "" : " (nop)") | |
b5b4541e HV |
120 | |
121 | #define call_vb_qop(vb, op, args...) \ | |
122 | ({ \ | |
a1d36d8c HV |
123 | int err; \ |
124 | \ | |
125 | log_vb_qop(vb, op); \ | |
126 | err = (vb)->vb2_queue->ops->op ? \ | |
127 | (vb)->vb2_queue->ops->op(args) : 0; \ | |
128 | if (!err) \ | |
129 | (vb)->cnt_ ## op++; \ | |
130 | err; \ | |
131 | }) | |
132 | ||
133 | #define call_void_vb_qop(vb, op, args...) \ | |
134 | ({ \ | |
135 | log_vb_qop(vb, op); \ | |
136 | if ((vb)->vb2_queue->ops->op) \ | |
137 | (vb)->vb2_queue->ops->op(args); \ | |
b5b4541e | 138 | (vb)->cnt_ ## op++; \ |
b5b4541e | 139 | }) |
b5b4541e HV |
140 | |
141 | #else | |
142 | ||
143 | #define call_memop(vb, op, args...) \ | |
a1d36d8c HV |
144 | ((vb)->vb2_queue->mem_ops->op ? \ |
145 | (vb)->vb2_queue->mem_ops->op(args) : 0) | |
146 | ||
147 | #define call_ptr_memop(vb, op, args...) \ | |
148 | ((vb)->vb2_queue->mem_ops->op ? \ | |
149 | (vb)->vb2_queue->mem_ops->op(args) : NULL) | |
150 | ||
151 | #define call_void_memop(vb, op, args...) \ | |
152 | do { \ | |
153 | if ((vb)->vb2_queue->mem_ops->op) \ | |
154 | (vb)->vb2_queue->mem_ops->op(args); \ | |
155 | } while (0) | |
e23ccc0a PO |
156 | |
157 | #define call_qop(q, op, args...) \ | |
b5b4541e | 158 | ((q)->ops->op ? (q)->ops->op(args) : 0) |
a1d36d8c HV |
159 | |
160 | #define call_void_qop(q, op, args...) \ | |
161 | do { \ | |
162 | if ((q)->ops->op) \ | |
163 | (q)->ops->op(args); \ | |
164 | } while (0) | |
b5b4541e HV |
165 | |
166 | #define call_vb_qop(vb, op, args...) \ | |
167 | ((vb)->vb2_queue->ops->op ? (vb)->vb2_queue->ops->op(args) : 0) | |
a1d36d8c HV |
168 | |
169 | #define call_void_vb_qop(vb, op, args...) \ | |
170 | do { \ | |
171 | if ((vb)->vb2_queue->ops->op) \ | |
172 | (vb)->vb2_queue->ops->op(args); \ | |
173 | } while (0) | |
b5b4541e HV |
174 | |
175 | #endif | |
e23ccc0a | 176 | |
f1343281 | 177 | /* Flags that are set by the vb2 core */ |
1b18e7a0 | 178 | #define V4L2_BUFFER_MASK_FLAGS (V4L2_BUF_FLAG_MAPPED | V4L2_BUF_FLAG_QUEUED | \ |
2d86401c | 179 | V4L2_BUF_FLAG_DONE | V4L2_BUF_FLAG_ERROR | \ |
1b18e7a0 SA |
180 | V4L2_BUF_FLAG_PREPARED | \ |
181 | V4L2_BUF_FLAG_TIMESTAMP_MASK) | |
f1343281 HV |
182 | /* Output buffer flags that should be passed on to the driver */ |
183 | #define V4L2_BUFFER_OUT_FLAGS (V4L2_BUF_FLAG_PFRAME | V4L2_BUF_FLAG_BFRAME | \ | |
184 | V4L2_BUF_FLAG_KEYFRAME | V4L2_BUF_FLAG_TIMECODE) | |
ea42c8ec | 185 | |
fb64dca8 | 186 | static void __vb2_queue_cancel(struct vb2_queue *q); |
ce0eff01 | 187 | static void __enqueue_in_driver(struct vb2_buffer *vb); |
fb64dca8 | 188 | |
e23ccc0a PO |
189 | /** |
190 | * __vb2_buf_mem_alloc() - allocate video memory for the given buffer | |
191 | */ | |
c1426bc7 | 192 | static int __vb2_buf_mem_alloc(struct vb2_buffer *vb) |
e23ccc0a PO |
193 | { |
194 | struct vb2_queue *q = vb->vb2_queue; | |
d935c57e HV |
195 | enum dma_data_direction dma_dir = |
196 | V4L2_TYPE_IS_OUTPUT(q->type) ? DMA_TO_DEVICE : DMA_FROM_DEVICE; | |
e23ccc0a PO |
197 | void *mem_priv; |
198 | int plane; | |
199 | ||
7f841459 MCC |
200 | /* |
201 | * Allocate memory for all planes in this buffer | |
202 | * NOTE: mmapped areas should be page aligned | |
203 | */ | |
e23ccc0a | 204 | for (plane = 0; plane < vb->num_planes; ++plane) { |
7f841459 MCC |
205 | unsigned long size = PAGE_ALIGN(q->plane_sizes[plane]); |
206 | ||
a1d36d8c | 207 | mem_priv = call_ptr_memop(vb, alloc, q->alloc_ctx[plane], |
d935c57e | 208 | size, dma_dir, q->gfp_flags); |
62a79436 | 209 | if (IS_ERR_OR_NULL(mem_priv)) |
e23ccc0a PO |
210 | goto free; |
211 | ||
212 | /* Associate allocator private data with this plane */ | |
213 | vb->planes[plane].mem_priv = mem_priv; | |
c1426bc7 | 214 | vb->v4l2_planes[plane].length = q->plane_sizes[plane]; |
e23ccc0a PO |
215 | } |
216 | ||
217 | return 0; | |
218 | free: | |
219 | /* Free already allocated memory if one of the allocations failed */ | |
a00d0266 | 220 | for (; plane > 0; --plane) { |
a1d36d8c | 221 | call_void_memop(vb, put, vb->planes[plane - 1].mem_priv); |
a00d0266 MS |
222 | vb->planes[plane - 1].mem_priv = NULL; |
223 | } | |
e23ccc0a PO |
224 | |
225 | return -ENOMEM; | |
226 | } | |
227 | ||
228 | /** | |
229 | * __vb2_buf_mem_free() - free memory of the given buffer | |
230 | */ | |
231 | static void __vb2_buf_mem_free(struct vb2_buffer *vb) | |
232 | { | |
e23ccc0a PO |
233 | unsigned int plane; |
234 | ||
235 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
a1d36d8c | 236 | call_void_memop(vb, put, vb->planes[plane].mem_priv); |
e23ccc0a | 237 | vb->planes[plane].mem_priv = NULL; |
3050040b | 238 | dprintk(3, "freed plane %d of buffer %d\n", plane, |
a00d0266 | 239 | vb->v4l2_buf.index); |
e23ccc0a PO |
240 | } |
241 | } | |
242 | ||
243 | /** | |
244 | * __vb2_buf_userptr_put() - release userspace memory associated with | |
245 | * a USERPTR buffer | |
246 | */ | |
247 | static void __vb2_buf_userptr_put(struct vb2_buffer *vb) | |
248 | { | |
e23ccc0a PO |
249 | unsigned int plane; |
250 | ||
251 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
a00d0266 | 252 | if (vb->planes[plane].mem_priv) |
a1d36d8c | 253 | call_void_memop(vb, put_userptr, vb->planes[plane].mem_priv); |
a00d0266 | 254 | vb->planes[plane].mem_priv = NULL; |
e23ccc0a PO |
255 | } |
256 | } | |
257 | ||
c5384048 SS |
258 | /** |
259 | * __vb2_plane_dmabuf_put() - release memory associated with | |
260 | * a DMABUF shared plane | |
261 | */ | |
b5b4541e | 262 | static void __vb2_plane_dmabuf_put(struct vb2_buffer *vb, struct vb2_plane *p) |
c5384048 SS |
263 | { |
264 | if (!p->mem_priv) | |
265 | return; | |
266 | ||
267 | if (p->dbuf_mapped) | |
a1d36d8c | 268 | call_void_memop(vb, unmap_dmabuf, p->mem_priv); |
c5384048 | 269 | |
a1d36d8c | 270 | call_void_memop(vb, detach_dmabuf, p->mem_priv); |
c5384048 SS |
271 | dma_buf_put(p->dbuf); |
272 | memset(p, 0, sizeof(*p)); | |
273 | } | |
274 | ||
275 | /** | |
276 | * __vb2_buf_dmabuf_put() - release memory associated with | |
277 | * a DMABUF shared buffer | |
278 | */ | |
279 | static void __vb2_buf_dmabuf_put(struct vb2_buffer *vb) | |
280 | { | |
c5384048 SS |
281 | unsigned int plane; |
282 | ||
283 | for (plane = 0; plane < vb->num_planes; ++plane) | |
b5b4541e | 284 | __vb2_plane_dmabuf_put(vb, &vb->planes[plane]); |
c5384048 SS |
285 | } |
286 | ||
a5e3d743 HV |
287 | /** |
288 | * __setup_lengths() - setup initial lengths for every plane in | |
289 | * every buffer on the queue | |
290 | */ | |
291 | static void __setup_lengths(struct vb2_queue *q, unsigned int n) | |
292 | { | |
293 | unsigned int buffer, plane; | |
294 | struct vb2_buffer *vb; | |
295 | ||
296 | for (buffer = q->num_buffers; buffer < q->num_buffers + n; ++buffer) { | |
297 | vb = q->bufs[buffer]; | |
298 | if (!vb) | |
299 | continue; | |
300 | ||
301 | for (plane = 0; plane < vb->num_planes; ++plane) | |
302 | vb->v4l2_planes[plane].length = q->plane_sizes[plane]; | |
303 | } | |
304 | } | |
305 | ||
e23ccc0a PO |
306 | /** |
307 | * __setup_offsets() - setup unique offsets ("cookies") for every plane in | |
308 | * every buffer on the queue | |
309 | */ | |
2d86401c | 310 | static void __setup_offsets(struct vb2_queue *q, unsigned int n) |
e23ccc0a PO |
311 | { |
312 | unsigned int buffer, plane; | |
313 | struct vb2_buffer *vb; | |
2d86401c | 314 | unsigned long off; |
e23ccc0a | 315 | |
2d86401c GL |
316 | if (q->num_buffers) { |
317 | struct v4l2_plane *p; | |
318 | vb = q->bufs[q->num_buffers - 1]; | |
319 | p = &vb->v4l2_planes[vb->num_planes - 1]; | |
320 | off = PAGE_ALIGN(p->m.mem_offset + p->length); | |
321 | } else { | |
322 | off = 0; | |
323 | } | |
324 | ||
325 | for (buffer = q->num_buffers; buffer < q->num_buffers + n; ++buffer) { | |
e23ccc0a PO |
326 | vb = q->bufs[buffer]; |
327 | if (!vb) | |
328 | continue; | |
329 | ||
330 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
331 | vb->v4l2_planes[plane].m.mem_offset = off; | |
332 | ||
3050040b | 333 | dprintk(3, "buffer %d, plane %d offset 0x%08lx\n", |
e23ccc0a PO |
334 | buffer, plane, off); |
335 | ||
336 | off += vb->v4l2_planes[plane].length; | |
337 | off = PAGE_ALIGN(off); | |
338 | } | |
339 | } | |
340 | } | |
341 | ||
342 | /** | |
343 | * __vb2_queue_alloc() - allocate videobuf buffer structures and (for MMAP type) | |
344 | * video buffer memory for all buffers/planes on the queue and initializes the | |
345 | * queue | |
346 | * | |
347 | * Returns the number of buffers successfully allocated. | |
348 | */ | |
349 | static int __vb2_queue_alloc(struct vb2_queue *q, enum v4l2_memory memory, | |
c1426bc7 | 350 | unsigned int num_buffers, unsigned int num_planes) |
e23ccc0a PO |
351 | { |
352 | unsigned int buffer; | |
353 | struct vb2_buffer *vb; | |
354 | int ret; | |
355 | ||
356 | for (buffer = 0; buffer < num_buffers; ++buffer) { | |
357 | /* Allocate videobuf buffer structures */ | |
358 | vb = kzalloc(q->buf_struct_size, GFP_KERNEL); | |
359 | if (!vb) { | |
3050040b | 360 | dprintk(1, "memory alloc for buffer struct failed\n"); |
e23ccc0a PO |
361 | break; |
362 | } | |
363 | ||
364 | /* Length stores number of planes for multiplanar buffers */ | |
365 | if (V4L2_TYPE_IS_MULTIPLANAR(q->type)) | |
366 | vb->v4l2_buf.length = num_planes; | |
367 | ||
368 | vb->state = VB2_BUF_STATE_DEQUEUED; | |
369 | vb->vb2_queue = q; | |
370 | vb->num_planes = num_planes; | |
2d86401c | 371 | vb->v4l2_buf.index = q->num_buffers + buffer; |
e23ccc0a PO |
372 | vb->v4l2_buf.type = q->type; |
373 | vb->v4l2_buf.memory = memory; | |
374 | ||
375 | /* Allocate video buffer memory for the MMAP type */ | |
376 | if (memory == V4L2_MEMORY_MMAP) { | |
c1426bc7 | 377 | ret = __vb2_buf_mem_alloc(vb); |
e23ccc0a | 378 | if (ret) { |
3050040b | 379 | dprintk(1, "failed allocating memory for " |
e23ccc0a PO |
380 | "buffer %d\n", buffer); |
381 | kfree(vb); | |
382 | break; | |
383 | } | |
384 | /* | |
385 | * Call the driver-provided buffer initialization | |
386 | * callback, if given. An error in initialization | |
387 | * results in queue setup failure. | |
388 | */ | |
b5b4541e | 389 | ret = call_vb_qop(vb, buf_init, vb); |
e23ccc0a | 390 | if (ret) { |
3050040b | 391 | dprintk(1, "buffer %d %p initialization" |
e23ccc0a PO |
392 | " failed\n", buffer, vb); |
393 | __vb2_buf_mem_free(vb); | |
394 | kfree(vb); | |
395 | break; | |
396 | } | |
397 | } | |
398 | ||
2d86401c | 399 | q->bufs[q->num_buffers + buffer] = vb; |
e23ccc0a PO |
400 | } |
401 | ||
a5e3d743 | 402 | __setup_lengths(q, buffer); |
dc77523c PZ |
403 | if (memory == V4L2_MEMORY_MMAP) |
404 | __setup_offsets(q, buffer); | |
e23ccc0a | 405 | |
3050040b | 406 | dprintk(1, "allocated %d buffers, %d plane(s) each\n", |
2d86401c | 407 | buffer, num_planes); |
e23ccc0a PO |
408 | |
409 | return buffer; | |
410 | } | |
411 | ||
412 | /** | |
413 | * __vb2_free_mem() - release all video buffer memory for a given queue | |
414 | */ | |
2d86401c | 415 | static void __vb2_free_mem(struct vb2_queue *q, unsigned int buffers) |
e23ccc0a PO |
416 | { |
417 | unsigned int buffer; | |
418 | struct vb2_buffer *vb; | |
419 | ||
2d86401c GL |
420 | for (buffer = q->num_buffers - buffers; buffer < q->num_buffers; |
421 | ++buffer) { | |
e23ccc0a PO |
422 | vb = q->bufs[buffer]; |
423 | if (!vb) | |
424 | continue; | |
425 | ||
426 | /* Free MMAP buffers or release USERPTR buffers */ | |
427 | if (q->memory == V4L2_MEMORY_MMAP) | |
428 | __vb2_buf_mem_free(vb); | |
c5384048 SS |
429 | else if (q->memory == V4L2_MEMORY_DMABUF) |
430 | __vb2_buf_dmabuf_put(vb); | |
e23ccc0a PO |
431 | else |
432 | __vb2_buf_userptr_put(vb); | |
433 | } | |
434 | } | |
435 | ||
436 | /** | |
2d86401c GL |
437 | * __vb2_queue_free() - free buffers at the end of the queue - video memory and |
438 | * related information, if no buffers are left return the queue to an | |
439 | * uninitialized state. Might be called even if the queue has already been freed. | |
e23ccc0a | 440 | */ |
63faabfd | 441 | static int __vb2_queue_free(struct vb2_queue *q, unsigned int buffers) |
e23ccc0a PO |
442 | { |
443 | unsigned int buffer; | |
444 | ||
63faabfd HV |
445 | /* |
446 | * Sanity check: when preparing a buffer the queue lock is released for | |
447 | * a short while (see __buf_prepare for the details), which would allow | |
448 | * a race with a reqbufs which can call this function. Removing the | |
449 | * buffers from underneath __buf_prepare is obviously a bad idea, so we | |
450 | * check if any of the buffers is in the state PREPARING, and if so we | |
451 | * just return -EAGAIN. | |
452 | */ | |
453 | for (buffer = q->num_buffers - buffers; buffer < q->num_buffers; | |
454 | ++buffer) { | |
455 | if (q->bufs[buffer] == NULL) | |
456 | continue; | |
457 | if (q->bufs[buffer]->state == VB2_BUF_STATE_PREPARING) { | |
fd4354cf | 458 | dprintk(1, "preparing buffers, cannot free\n"); |
63faabfd HV |
459 | return -EAGAIN; |
460 | } | |
461 | } | |
462 | ||
e23ccc0a | 463 | /* Call driver-provided cleanup function for each buffer, if provided */ |
b5b4541e HV |
464 | for (buffer = q->num_buffers - buffers; buffer < q->num_buffers; |
465 | ++buffer) { | |
256f3162 HV |
466 | struct vb2_buffer *vb = q->bufs[buffer]; |
467 | ||
468 | if (vb && vb->planes[0].mem_priv) | |
a1d36d8c | 469 | call_void_vb_qop(vb, buf_cleanup, vb); |
e23ccc0a PO |
470 | } |
471 | ||
472 | /* Release video buffer memory */ | |
2d86401c | 473 | __vb2_free_mem(q, buffers); |
e23ccc0a | 474 | |
b5b4541e HV |
475 | #ifdef CONFIG_VIDEO_ADV_DEBUG |
476 | /* | |
477 | * Check that all the calls were balances during the life-time of this | |
478 | * queue. If not (or if the debug level is 1 or up), then dump the | |
479 | * counters to the kernel log. | |
480 | */ | |
481 | if (q->num_buffers) { | |
482 | bool unbalanced = q->cnt_start_streaming != q->cnt_stop_streaming || | |
483 | q->cnt_wait_prepare != q->cnt_wait_finish; | |
484 | ||
485 | if (unbalanced || debug) { | |
486 | pr_info("vb2: counters for queue %p:%s\n", q, | |
487 | unbalanced ? " UNBALANCED!" : ""); | |
488 | pr_info("vb2: setup: %u start_streaming: %u stop_streaming: %u\n", | |
489 | q->cnt_queue_setup, q->cnt_start_streaming, | |
490 | q->cnt_stop_streaming); | |
491 | pr_info("vb2: wait_prepare: %u wait_finish: %u\n", | |
492 | q->cnt_wait_prepare, q->cnt_wait_finish); | |
493 | } | |
494 | q->cnt_queue_setup = 0; | |
495 | q->cnt_wait_prepare = 0; | |
496 | q->cnt_wait_finish = 0; | |
497 | q->cnt_start_streaming = 0; | |
498 | q->cnt_stop_streaming = 0; | |
499 | } | |
500 | for (buffer = 0; buffer < q->num_buffers; ++buffer) { | |
501 | struct vb2_buffer *vb = q->bufs[buffer]; | |
502 | bool unbalanced = vb->cnt_mem_alloc != vb->cnt_mem_put || | |
503 | vb->cnt_mem_prepare != vb->cnt_mem_finish || | |
504 | vb->cnt_mem_get_userptr != vb->cnt_mem_put_userptr || | |
505 | vb->cnt_mem_attach_dmabuf != vb->cnt_mem_detach_dmabuf || | |
506 | vb->cnt_mem_map_dmabuf != vb->cnt_mem_unmap_dmabuf || | |
507 | vb->cnt_buf_queue != vb->cnt_buf_done || | |
508 | vb->cnt_buf_prepare != vb->cnt_buf_finish || | |
509 | vb->cnt_buf_init != vb->cnt_buf_cleanup; | |
510 | ||
511 | if (unbalanced || debug) { | |
512 | pr_info("vb2: counters for queue %p, buffer %d:%s\n", | |
513 | q, buffer, unbalanced ? " UNBALANCED!" : ""); | |
514 | pr_info("vb2: buf_init: %u buf_cleanup: %u buf_prepare: %u buf_finish: %u\n", | |
515 | vb->cnt_buf_init, vb->cnt_buf_cleanup, | |
516 | vb->cnt_buf_prepare, vb->cnt_buf_finish); | |
517 | pr_info("vb2: buf_queue: %u buf_done: %u\n", | |
518 | vb->cnt_buf_queue, vb->cnt_buf_done); | |
519 | pr_info("vb2: alloc: %u put: %u prepare: %u finish: %u mmap: %u\n", | |
520 | vb->cnt_mem_alloc, vb->cnt_mem_put, | |
521 | vb->cnt_mem_prepare, vb->cnt_mem_finish, | |
522 | vb->cnt_mem_mmap); | |
523 | pr_info("vb2: get_userptr: %u put_userptr: %u\n", | |
524 | vb->cnt_mem_get_userptr, vb->cnt_mem_put_userptr); | |
525 | pr_info("vb2: attach_dmabuf: %u detach_dmabuf: %u map_dmabuf: %u unmap_dmabuf: %u\n", | |
526 | vb->cnt_mem_attach_dmabuf, vb->cnt_mem_detach_dmabuf, | |
527 | vb->cnt_mem_map_dmabuf, vb->cnt_mem_unmap_dmabuf); | |
528 | pr_info("vb2: get_dmabuf: %u num_users: %u vaddr: %u cookie: %u\n", | |
529 | vb->cnt_mem_get_dmabuf, | |
530 | vb->cnt_mem_num_users, | |
531 | vb->cnt_mem_vaddr, | |
532 | vb->cnt_mem_cookie); | |
533 | } | |
534 | } | |
535 | #endif | |
536 | ||
e23ccc0a | 537 | /* Free videobuf buffers */ |
2d86401c GL |
538 | for (buffer = q->num_buffers - buffers; buffer < q->num_buffers; |
539 | ++buffer) { | |
e23ccc0a PO |
540 | kfree(q->bufs[buffer]); |
541 | q->bufs[buffer] = NULL; | |
542 | } | |
543 | ||
2d86401c | 544 | q->num_buffers -= buffers; |
a7afcacc | 545 | if (!q->num_buffers) { |
2d86401c | 546 | q->memory = 0; |
a7afcacc HV |
547 | INIT_LIST_HEAD(&q->queued_list); |
548 | } | |
63faabfd | 549 | return 0; |
e23ccc0a PO |
550 | } |
551 | ||
552 | /** | |
553 | * __verify_planes_array() - verify that the planes array passed in struct | |
554 | * v4l2_buffer from userspace can be safely used | |
555 | */ | |
2d86401c | 556 | static int __verify_planes_array(struct vb2_buffer *vb, const struct v4l2_buffer *b) |
e23ccc0a | 557 | { |
32a77260 HV |
558 | if (!V4L2_TYPE_IS_MULTIPLANAR(b->type)) |
559 | return 0; | |
560 | ||
e23ccc0a PO |
561 | /* Is memory for copying plane information present? */ |
562 | if (NULL == b->m.planes) { | |
3050040b | 563 | dprintk(1, "multi-planar buffer passed but " |
e23ccc0a PO |
564 | "planes array not provided\n"); |
565 | return -EINVAL; | |
566 | } | |
567 | ||
568 | if (b->length < vb->num_planes || b->length > VIDEO_MAX_PLANES) { | |
3050040b | 569 | dprintk(1, "incorrect planes array length, " |
e23ccc0a PO |
570 | "expected %d, got %d\n", vb->num_planes, b->length); |
571 | return -EINVAL; | |
572 | } | |
573 | ||
574 | return 0; | |
575 | } | |
576 | ||
8023ed09 LP |
577 | /** |
578 | * __verify_length() - Verify that the bytesused value for each plane fits in | |
579 | * the plane length and that the data offset doesn't exceed the bytesused value. | |
580 | */ | |
581 | static int __verify_length(struct vb2_buffer *vb, const struct v4l2_buffer *b) | |
582 | { | |
583 | unsigned int length; | |
8a75ffb8 | 584 | unsigned int bytesused; |
8023ed09 LP |
585 | unsigned int plane; |
586 | ||
587 | if (!V4L2_TYPE_IS_OUTPUT(b->type)) | |
588 | return 0; | |
589 | ||
590 | if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) { | |
591 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
8a75ffb8 HV |
592 | length = (b->memory == V4L2_MEMORY_USERPTR || |
593 | b->memory == V4L2_MEMORY_DMABUF) | |
8023ed09 LP |
594 | ? b->m.planes[plane].length |
595 | : vb->v4l2_planes[plane].length; | |
8a75ffb8 HV |
596 | bytesused = b->m.planes[plane].bytesused |
597 | ? b->m.planes[plane].bytesused : length; | |
8023ed09 LP |
598 | |
599 | if (b->m.planes[plane].bytesused > length) | |
600 | return -EINVAL; | |
3c5c23c5 SN |
601 | |
602 | if (b->m.planes[plane].data_offset > 0 && | |
8a75ffb8 | 603 | b->m.planes[plane].data_offset >= bytesused) |
8023ed09 LP |
604 | return -EINVAL; |
605 | } | |
606 | } else { | |
607 | length = (b->memory == V4L2_MEMORY_USERPTR) | |
608 | ? b->length : vb->v4l2_planes[0].length; | |
8a75ffb8 | 609 | bytesused = b->bytesused ? b->bytesused : length; |
8023ed09 LP |
610 | |
611 | if (b->bytesused > length) | |
612 | return -EINVAL; | |
613 | } | |
614 | ||
615 | return 0; | |
616 | } | |
617 | ||
25a27d91 MS |
618 | /** |
619 | * __buffer_in_use() - return true if the buffer is in use and | |
620 | * the queue cannot be freed (by the means of REQBUFS(0)) call | |
621 | */ | |
622 | static bool __buffer_in_use(struct vb2_queue *q, struct vb2_buffer *vb) | |
623 | { | |
624 | unsigned int plane; | |
625 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
2c2dd6ac | 626 | void *mem_priv = vb->planes[plane].mem_priv; |
25a27d91 MS |
627 | /* |
628 | * If num_users() has not been provided, call_memop | |
629 | * will return 0, apparently nobody cares about this | |
630 | * case anyway. If num_users() returns more than 1, | |
631 | * we are not the only user of the plane's memory. | |
632 | */ | |
b5b4541e | 633 | if (mem_priv && call_memop(vb, num_users, mem_priv) > 1) |
25a27d91 MS |
634 | return true; |
635 | } | |
636 | return false; | |
637 | } | |
638 | ||
639 | /** | |
640 | * __buffers_in_use() - return true if any buffers on the queue are in use and | |
641 | * the queue cannot be freed (by the means of REQBUFS(0)) call | |
642 | */ | |
643 | static bool __buffers_in_use(struct vb2_queue *q) | |
644 | { | |
645 | unsigned int buffer; | |
646 | for (buffer = 0; buffer < q->num_buffers; ++buffer) { | |
647 | if (__buffer_in_use(q, q->bufs[buffer])) | |
648 | return true; | |
649 | } | |
650 | return false; | |
651 | } | |
652 | ||
e23ccc0a PO |
653 | /** |
654 | * __fill_v4l2_buffer() - fill in a struct v4l2_buffer with information to be | |
655 | * returned to userspace | |
656 | */ | |
32a77260 | 657 | static void __fill_v4l2_buffer(struct vb2_buffer *vb, struct v4l2_buffer *b) |
e23ccc0a PO |
658 | { |
659 | struct vb2_queue *q = vb->vb2_queue; | |
e23ccc0a | 660 | |
2b719d7b | 661 | /* Copy back data such as timestamp, flags, etc. */ |
e23ccc0a | 662 | memcpy(b, &vb->v4l2_buf, offsetof(struct v4l2_buffer, m)); |
2b719d7b | 663 | b->reserved2 = vb->v4l2_buf.reserved2; |
e23ccc0a PO |
664 | b->reserved = vb->v4l2_buf.reserved; |
665 | ||
666 | if (V4L2_TYPE_IS_MULTIPLANAR(q->type)) { | |
e23ccc0a PO |
667 | /* |
668 | * Fill in plane-related data if userspace provided an array | |
32a77260 | 669 | * for it. The caller has already verified memory and size. |
e23ccc0a | 670 | */ |
3c0b6061 | 671 | b->length = vb->num_planes; |
e23ccc0a PO |
672 | memcpy(b->m.planes, vb->v4l2_planes, |
673 | b->length * sizeof(struct v4l2_plane)); | |
674 | } else { | |
675 | /* | |
676 | * We use length and offset in v4l2_planes array even for | |
677 | * single-planar buffers, but userspace does not. | |
678 | */ | |
679 | b->length = vb->v4l2_planes[0].length; | |
680 | b->bytesused = vb->v4l2_planes[0].bytesused; | |
681 | if (q->memory == V4L2_MEMORY_MMAP) | |
682 | b->m.offset = vb->v4l2_planes[0].m.mem_offset; | |
683 | else if (q->memory == V4L2_MEMORY_USERPTR) | |
684 | b->m.userptr = vb->v4l2_planes[0].m.userptr; | |
c5384048 SS |
685 | else if (q->memory == V4L2_MEMORY_DMABUF) |
686 | b->m.fd = vb->v4l2_planes[0].m.fd; | |
e23ccc0a PO |
687 | } |
688 | ||
ea42c8ec MS |
689 | /* |
690 | * Clear any buffer state related flags. | |
691 | */ | |
1b18e7a0 | 692 | b->flags &= ~V4L2_BUFFER_MASK_FLAGS; |
7ce6fd8f SA |
693 | b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK; |
694 | if ((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) != | |
695 | V4L2_BUF_FLAG_TIMESTAMP_COPY) { | |
696 | /* | |
697 | * For non-COPY timestamps, drop timestamp source bits | |
698 | * and obtain the timestamp source from the queue. | |
699 | */ | |
700 | b->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK; | |
701 | b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TSTAMP_SRC_MASK; | |
702 | } | |
e23ccc0a PO |
703 | |
704 | switch (vb->state) { | |
705 | case VB2_BUF_STATE_QUEUED: | |
706 | case VB2_BUF_STATE_ACTIVE: | |
707 | b->flags |= V4L2_BUF_FLAG_QUEUED; | |
708 | break; | |
709 | case VB2_BUF_STATE_ERROR: | |
710 | b->flags |= V4L2_BUF_FLAG_ERROR; | |
711 | /* fall through */ | |
712 | case VB2_BUF_STATE_DONE: | |
713 | b->flags |= V4L2_BUF_FLAG_DONE; | |
714 | break; | |
ebc087d0 | 715 | case VB2_BUF_STATE_PREPARED: |
2d86401c GL |
716 | b->flags |= V4L2_BUF_FLAG_PREPARED; |
717 | break; | |
b18a8ff2 | 718 | case VB2_BUF_STATE_PREPARING: |
2d86401c | 719 | case VB2_BUF_STATE_DEQUEUED: |
6d058c56 | 720 | case VB2_BUF_STATE_REQUEUEING: |
e23ccc0a PO |
721 | /* nothing */ |
722 | break; | |
723 | } | |
724 | ||
25a27d91 | 725 | if (__buffer_in_use(q, vb)) |
e23ccc0a | 726 | b->flags |= V4L2_BUF_FLAG_MAPPED; |
e23ccc0a PO |
727 | } |
728 | ||
729 | /** | |
730 | * vb2_querybuf() - query video buffer information | |
731 | * @q: videobuf queue | |
732 | * @b: buffer struct passed from userspace to vidioc_querybuf handler | |
733 | * in driver | |
734 | * | |
735 | * Should be called from vidioc_querybuf ioctl handler in driver. | |
736 | * This function will verify the passed v4l2_buffer structure and fill the | |
737 | * relevant information for the userspace. | |
738 | * | |
739 | * The return values from this function are intended to be directly returned | |
740 | * from vidioc_querybuf handler in driver. | |
741 | */ | |
742 | int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b) | |
743 | { | |
744 | struct vb2_buffer *vb; | |
32a77260 | 745 | int ret; |
e23ccc0a PO |
746 | |
747 | if (b->type != q->type) { | |
fd4354cf | 748 | dprintk(1, "wrong buffer type\n"); |
e23ccc0a PO |
749 | return -EINVAL; |
750 | } | |
751 | ||
752 | if (b->index >= q->num_buffers) { | |
fd4354cf | 753 | dprintk(1, "buffer index out of range\n"); |
e23ccc0a PO |
754 | return -EINVAL; |
755 | } | |
756 | vb = q->bufs[b->index]; | |
32a77260 HV |
757 | ret = __verify_planes_array(vb, b); |
758 | if (!ret) | |
759 | __fill_v4l2_buffer(vb, b); | |
760 | return ret; | |
e23ccc0a PO |
761 | } |
762 | EXPORT_SYMBOL(vb2_querybuf); | |
763 | ||
764 | /** | |
765 | * __verify_userptr_ops() - verify that all memory operations required for | |
766 | * USERPTR queue type have been provided | |
767 | */ | |
768 | static int __verify_userptr_ops(struct vb2_queue *q) | |
769 | { | |
770 | if (!(q->io_modes & VB2_USERPTR) || !q->mem_ops->get_userptr || | |
771 | !q->mem_ops->put_userptr) | |
772 | return -EINVAL; | |
773 | ||
774 | return 0; | |
775 | } | |
776 | ||
777 | /** | |
778 | * __verify_mmap_ops() - verify that all memory operations required for | |
779 | * MMAP queue type have been provided | |
780 | */ | |
781 | static int __verify_mmap_ops(struct vb2_queue *q) | |
782 | { | |
783 | if (!(q->io_modes & VB2_MMAP) || !q->mem_ops->alloc || | |
784 | !q->mem_ops->put || !q->mem_ops->mmap) | |
785 | return -EINVAL; | |
786 | ||
787 | return 0; | |
788 | } | |
789 | ||
c5384048 SS |
790 | /** |
791 | * __verify_dmabuf_ops() - verify that all memory operations required for | |
792 | * DMABUF queue type have been provided | |
793 | */ | |
794 | static int __verify_dmabuf_ops(struct vb2_queue *q) | |
795 | { | |
796 | if (!(q->io_modes & VB2_DMABUF) || !q->mem_ops->attach_dmabuf || | |
797 | !q->mem_ops->detach_dmabuf || !q->mem_ops->map_dmabuf || | |
798 | !q->mem_ops->unmap_dmabuf) | |
799 | return -EINVAL; | |
800 | ||
801 | return 0; | |
802 | } | |
803 | ||
e23ccc0a | 804 | /** |
37d9ed94 HV |
805 | * __verify_memory_type() - Check whether the memory type and buffer type |
806 | * passed to a buffer operation are compatible with the queue. | |
807 | */ | |
808 | static int __verify_memory_type(struct vb2_queue *q, | |
809 | enum v4l2_memory memory, enum v4l2_buf_type type) | |
810 | { | |
c5384048 SS |
811 | if (memory != V4L2_MEMORY_MMAP && memory != V4L2_MEMORY_USERPTR && |
812 | memory != V4L2_MEMORY_DMABUF) { | |
fd4354cf | 813 | dprintk(1, "unsupported memory type\n"); |
37d9ed94 HV |
814 | return -EINVAL; |
815 | } | |
816 | ||
817 | if (type != q->type) { | |
fd4354cf | 818 | dprintk(1, "requested type is incorrect\n"); |
37d9ed94 HV |
819 | return -EINVAL; |
820 | } | |
821 | ||
822 | /* | |
823 | * Make sure all the required memory ops for given memory type | |
824 | * are available. | |
825 | */ | |
826 | if (memory == V4L2_MEMORY_MMAP && __verify_mmap_ops(q)) { | |
fd4354cf | 827 | dprintk(1, "MMAP for current setup unsupported\n"); |
37d9ed94 HV |
828 | return -EINVAL; |
829 | } | |
830 | ||
831 | if (memory == V4L2_MEMORY_USERPTR && __verify_userptr_ops(q)) { | |
fd4354cf | 832 | dprintk(1, "USERPTR for current setup unsupported\n"); |
37d9ed94 HV |
833 | return -EINVAL; |
834 | } | |
835 | ||
c5384048 | 836 | if (memory == V4L2_MEMORY_DMABUF && __verify_dmabuf_ops(q)) { |
fd4354cf | 837 | dprintk(1, "DMABUF for current setup unsupported\n"); |
c5384048 SS |
838 | return -EINVAL; |
839 | } | |
840 | ||
37d9ed94 HV |
841 | /* |
842 | * Place the busy tests at the end: -EBUSY can be ignored when | |
843 | * create_bufs is called with count == 0, but count == 0 should still | |
844 | * do the memory and type validation. | |
845 | */ | |
74753cff | 846 | if (vb2_fileio_is_active(q)) { |
fd4354cf | 847 | dprintk(1, "file io in progress\n"); |
37d9ed94 HV |
848 | return -EBUSY; |
849 | } | |
850 | return 0; | |
851 | } | |
852 | ||
853 | /** | |
854 | * __reqbufs() - Initiate streaming | |
e23ccc0a PO |
855 | * @q: videobuf2 queue |
856 | * @req: struct passed from userspace to vidioc_reqbufs handler in driver | |
857 | * | |
858 | * Should be called from vidioc_reqbufs ioctl handler of a driver. | |
859 | * This function: | |
860 | * 1) verifies streaming parameters passed from the userspace, | |
861 | * 2) sets up the queue, | |
862 | * 3) negotiates number of buffers and planes per buffer with the driver | |
863 | * to be used during streaming, | |
864 | * 4) allocates internal buffer structures (struct vb2_buffer), according to | |
865 | * the agreed parameters, | |
866 | * 5) for MMAP memory type, allocates actual video memory, using the | |
867 | * memory handling/allocation routines provided during queue initialization | |
868 | * | |
869 | * If req->count is 0, all the memory will be freed instead. | |
870 | * If the queue has been allocated previously (by a previous vb2_reqbufs) call | |
871 | * and the queue is not busy, memory will be reallocated. | |
872 | * | |
873 | * The return values from this function are intended to be directly returned | |
874 | * from vidioc_reqbufs handler in driver. | |
875 | */ | |
37d9ed94 | 876 | static int __reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req) |
e23ccc0a | 877 | { |
2d86401c | 878 | unsigned int num_buffers, allocated_buffers, num_planes = 0; |
37d9ed94 | 879 | int ret; |
e23ccc0a PO |
880 | |
881 | if (q->streaming) { | |
fd4354cf | 882 | dprintk(1, "streaming active\n"); |
e23ccc0a PO |
883 | return -EBUSY; |
884 | } | |
885 | ||
29e3fbd8 | 886 | if (req->count == 0 || q->num_buffers != 0 || q->memory != req->memory) { |
e23ccc0a PO |
887 | /* |
888 | * We already have buffers allocated, so first check if they | |
889 | * are not in use and can be freed. | |
890 | */ | |
f035eb4e | 891 | mutex_lock(&q->mmap_lock); |
e23ccc0a | 892 | if (q->memory == V4L2_MEMORY_MMAP && __buffers_in_use(q)) { |
f035eb4e | 893 | mutex_unlock(&q->mmap_lock); |
fd4354cf | 894 | dprintk(1, "memory in use, cannot free\n"); |
e23ccc0a PO |
895 | return -EBUSY; |
896 | } | |
897 | ||
fb64dca8 HV |
898 | /* |
899 | * Call queue_cancel to clean up any buffers in the PREPARED or | |
900 | * QUEUED state which is possible if buffers were prepared or | |
901 | * queued without ever calling STREAMON. | |
902 | */ | |
903 | __vb2_queue_cancel(q); | |
63faabfd | 904 | ret = __vb2_queue_free(q, q->num_buffers); |
f035eb4e | 905 | mutex_unlock(&q->mmap_lock); |
63faabfd HV |
906 | if (ret) |
907 | return ret; | |
29e3fbd8 MS |
908 | |
909 | /* | |
910 | * In case of REQBUFS(0) return immediately without calling | |
911 | * driver's queue_setup() callback and allocating resources. | |
912 | */ | |
913 | if (req->count == 0) | |
914 | return 0; | |
e23ccc0a PO |
915 | } |
916 | ||
917 | /* | |
918 | * Make sure the requested values and current defaults are sane. | |
919 | */ | |
920 | num_buffers = min_t(unsigned int, req->count, VIDEO_MAX_FRAME); | |
4cf743de | 921 | num_buffers = max_t(unsigned int, num_buffers, q->min_buffers_needed); |
c1426bc7 | 922 | memset(q->plane_sizes, 0, sizeof(q->plane_sizes)); |
e23ccc0a | 923 | memset(q->alloc_ctx, 0, sizeof(q->alloc_ctx)); |
13b14095 | 924 | q->memory = req->memory; |
e23ccc0a PO |
925 | |
926 | /* | |
927 | * Ask the driver how many buffers and planes per buffer it requires. | |
928 | * Driver also sets the size and allocator context for each plane. | |
929 | */ | |
fc714e70 | 930 | ret = call_qop(q, queue_setup, q, NULL, &num_buffers, &num_planes, |
c1426bc7 | 931 | q->plane_sizes, q->alloc_ctx); |
a1d36d8c | 932 | if (ret) |
e23ccc0a PO |
933 | return ret; |
934 | ||
935 | /* Finally, allocate buffers and video memory */ | |
a7afcacc HV |
936 | allocated_buffers = __vb2_queue_alloc(q, req->memory, num_buffers, num_planes); |
937 | if (allocated_buffers == 0) { | |
3050040b | 938 | dprintk(1, "memory allocation failed\n"); |
66072d4f | 939 | return -ENOMEM; |
e23ccc0a PO |
940 | } |
941 | ||
b3379c62 HV |
942 | /* |
943 | * There is no point in continuing if we can't allocate the minimum | |
944 | * number of buffers needed by this vb2_queue. | |
945 | */ | |
946 | if (allocated_buffers < q->min_buffers_needed) | |
947 | ret = -ENOMEM; | |
948 | ||
e23ccc0a PO |
949 | /* |
950 | * Check if driver can handle the allocated number of buffers. | |
951 | */ | |
b3379c62 | 952 | if (!ret && allocated_buffers < num_buffers) { |
2d86401c | 953 | num_buffers = allocated_buffers; |
e23ccc0a | 954 | |
fc714e70 GL |
955 | ret = call_qop(q, queue_setup, q, NULL, &num_buffers, |
956 | &num_planes, q->plane_sizes, q->alloc_ctx); | |
e23ccc0a | 957 | |
2d86401c | 958 | if (!ret && allocated_buffers < num_buffers) |
e23ccc0a | 959 | ret = -ENOMEM; |
e23ccc0a PO |
960 | |
961 | /* | |
2d86401c GL |
962 | * Either the driver has accepted a smaller number of buffers, |
963 | * or .queue_setup() returned an error | |
e23ccc0a | 964 | */ |
2d86401c GL |
965 | } |
966 | ||
f035eb4e | 967 | mutex_lock(&q->mmap_lock); |
2d86401c GL |
968 | q->num_buffers = allocated_buffers; |
969 | ||
970 | if (ret < 0) { | |
a7afcacc HV |
971 | /* |
972 | * Note: __vb2_queue_free() will subtract 'allocated_buffers' | |
973 | * from q->num_buffers. | |
974 | */ | |
2d86401c | 975 | __vb2_queue_free(q, allocated_buffers); |
f035eb4e | 976 | mutex_unlock(&q->mmap_lock); |
2d86401c | 977 | return ret; |
e23ccc0a | 978 | } |
f035eb4e | 979 | mutex_unlock(&q->mmap_lock); |
e23ccc0a | 980 | |
e23ccc0a PO |
981 | /* |
982 | * Return the number of successfully allocated buffers | |
983 | * to the userspace. | |
984 | */ | |
2d86401c | 985 | req->count = allocated_buffers; |
58d75f4b | 986 | q->waiting_for_buffers = !V4L2_TYPE_IS_OUTPUT(q->type); |
e23ccc0a PO |
987 | |
988 | return 0; | |
e23ccc0a | 989 | } |
37d9ed94 HV |
990 | |
991 | /** | |
992 | * vb2_reqbufs() - Wrapper for __reqbufs() that also verifies the memory and | |
993 | * type values. | |
994 | * @q: videobuf2 queue | |
995 | * @req: struct passed from userspace to vidioc_reqbufs handler in driver | |
996 | */ | |
997 | int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req) | |
998 | { | |
999 | int ret = __verify_memory_type(q, req->memory, req->type); | |
1000 | ||
1001 | return ret ? ret : __reqbufs(q, req); | |
1002 | } | |
e23ccc0a PO |
1003 | EXPORT_SYMBOL_GPL(vb2_reqbufs); |
1004 | ||
2d86401c | 1005 | /** |
37d9ed94 | 1006 | * __create_bufs() - Allocate buffers and any required auxiliary structs |
2d86401c GL |
1007 | * @q: videobuf2 queue |
1008 | * @create: creation parameters, passed from userspace to vidioc_create_bufs | |
1009 | * handler in driver | |
1010 | * | |
1011 | * Should be called from vidioc_create_bufs ioctl handler of a driver. | |
1012 | * This function: | |
1013 | * 1) verifies parameter sanity | |
1014 | * 2) calls the .queue_setup() queue operation | |
1015 | * 3) performs any necessary memory allocations | |
1016 | * | |
1017 | * The return values from this function are intended to be directly returned | |
1018 | * from vidioc_create_bufs handler in driver. | |
1019 | */ | |
37d9ed94 | 1020 | static int __create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) |
2d86401c GL |
1021 | { |
1022 | unsigned int num_planes = 0, num_buffers, allocated_buffers; | |
37d9ed94 | 1023 | int ret; |
2d86401c GL |
1024 | |
1025 | if (q->num_buffers == VIDEO_MAX_FRAME) { | |
fd4354cf | 1026 | dprintk(1, "maximum number of buffers already allocated\n"); |
2d86401c GL |
1027 | return -ENOBUFS; |
1028 | } | |
1029 | ||
2d86401c GL |
1030 | if (!q->num_buffers) { |
1031 | memset(q->plane_sizes, 0, sizeof(q->plane_sizes)); | |
1032 | memset(q->alloc_ctx, 0, sizeof(q->alloc_ctx)); | |
1033 | q->memory = create->memory; | |
58d75f4b | 1034 | q->waiting_for_buffers = !V4L2_TYPE_IS_OUTPUT(q->type); |
2d86401c GL |
1035 | } |
1036 | ||
1037 | num_buffers = min(create->count, VIDEO_MAX_FRAME - q->num_buffers); | |
1038 | ||
1039 | /* | |
1040 | * Ask the driver, whether the requested number of buffers, planes per | |
1041 | * buffer and their sizes are acceptable | |
1042 | */ | |
1043 | ret = call_qop(q, queue_setup, q, &create->format, &num_buffers, | |
1044 | &num_planes, q->plane_sizes, q->alloc_ctx); | |
a1d36d8c | 1045 | if (ret) |
2d86401c GL |
1046 | return ret; |
1047 | ||
1048 | /* Finally, allocate buffers and video memory */ | |
a7afcacc | 1049 | allocated_buffers = __vb2_queue_alloc(q, create->memory, num_buffers, |
2d86401c | 1050 | num_planes); |
a7afcacc | 1051 | if (allocated_buffers == 0) { |
3050040b | 1052 | dprintk(1, "memory allocation failed\n"); |
f05393d2 | 1053 | return -ENOMEM; |
2d86401c GL |
1054 | } |
1055 | ||
2d86401c GL |
1056 | /* |
1057 | * Check if driver can handle the so far allocated number of buffers. | |
1058 | */ | |
a7afcacc HV |
1059 | if (allocated_buffers < num_buffers) { |
1060 | num_buffers = allocated_buffers; | |
2d86401c GL |
1061 | |
1062 | /* | |
1063 | * q->num_buffers contains the total number of buffers, that the | |
1064 | * queue driver has set up | |
1065 | */ | |
1066 | ret = call_qop(q, queue_setup, q, &create->format, &num_buffers, | |
1067 | &num_planes, q->plane_sizes, q->alloc_ctx); | |
1068 | ||
1069 | if (!ret && allocated_buffers < num_buffers) | |
1070 | ret = -ENOMEM; | |
1071 | ||
1072 | /* | |
1073 | * Either the driver has accepted a smaller number of buffers, | |
1074 | * or .queue_setup() returned an error | |
1075 | */ | |
1076 | } | |
1077 | ||
f035eb4e | 1078 | mutex_lock(&q->mmap_lock); |
2d86401c GL |
1079 | q->num_buffers += allocated_buffers; |
1080 | ||
1081 | if (ret < 0) { | |
a7afcacc HV |
1082 | /* |
1083 | * Note: __vb2_queue_free() will subtract 'allocated_buffers' | |
1084 | * from q->num_buffers. | |
1085 | */ | |
2d86401c | 1086 | __vb2_queue_free(q, allocated_buffers); |
f035eb4e | 1087 | mutex_unlock(&q->mmap_lock); |
f05393d2 | 1088 | return -ENOMEM; |
2d86401c | 1089 | } |
f035eb4e | 1090 | mutex_unlock(&q->mmap_lock); |
2d86401c GL |
1091 | |
1092 | /* | |
1093 | * Return the number of successfully allocated buffers | |
1094 | * to the userspace. | |
1095 | */ | |
1096 | create->count = allocated_buffers; | |
1097 | ||
1098 | return 0; | |
1099 | } | |
37d9ed94 HV |
1100 | |
1101 | /** | |
53aa3b19 NT |
1102 | * vb2_create_bufs() - Wrapper for __create_bufs() that also verifies the |
1103 | * memory and type values. | |
37d9ed94 HV |
1104 | * @q: videobuf2 queue |
1105 | * @create: creation parameters, passed from userspace to vidioc_create_bufs | |
1106 | * handler in driver | |
1107 | */ | |
1108 | int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) | |
1109 | { | |
1110 | int ret = __verify_memory_type(q, create->memory, create->format.type); | |
1111 | ||
1112 | create->index = q->num_buffers; | |
f05393d2 HV |
1113 | if (create->count == 0) |
1114 | return ret != -EBUSY ? ret : 0; | |
37d9ed94 HV |
1115 | return ret ? ret : __create_bufs(q, create); |
1116 | } | |
2d86401c GL |
1117 | EXPORT_SYMBOL_GPL(vb2_create_bufs); |
1118 | ||
e23ccc0a PO |
1119 | /** |
1120 | * vb2_plane_vaddr() - Return a kernel virtual address of a given plane | |
1121 | * @vb: vb2_buffer to which the plane in question belongs to | |
1122 | * @plane_no: plane number for which the address is to be returned | |
1123 | * | |
1124 | * This function returns a kernel virtual address of a given plane if | |
1125 | * such a mapping exist, NULL otherwise. | |
1126 | */ | |
1127 | void *vb2_plane_vaddr(struct vb2_buffer *vb, unsigned int plane_no) | |
1128 | { | |
a00d0266 | 1129 | if (plane_no > vb->num_planes || !vb->planes[plane_no].mem_priv) |
e23ccc0a PO |
1130 | return NULL; |
1131 | ||
a1d36d8c | 1132 | return call_ptr_memop(vb, vaddr, vb->planes[plane_no].mem_priv); |
e23ccc0a PO |
1133 | |
1134 | } | |
1135 | EXPORT_SYMBOL_GPL(vb2_plane_vaddr); | |
1136 | ||
1137 | /** | |
1138 | * vb2_plane_cookie() - Return allocator specific cookie for the given plane | |
1139 | * @vb: vb2_buffer to which the plane in question belongs to | |
1140 | * @plane_no: plane number for which the cookie is to be returned | |
1141 | * | |
1142 | * This function returns an allocator specific cookie for a given plane if | |
1143 | * available, NULL otherwise. The allocator should provide some simple static | |
1144 | * inline function, which would convert this cookie to the allocator specific | |
1145 | * type that can be used directly by the driver to access the buffer. This can | |
1146 | * be for example physical address, pointer to scatter list or IOMMU mapping. | |
1147 | */ | |
1148 | void *vb2_plane_cookie(struct vb2_buffer *vb, unsigned int plane_no) | |
1149 | { | |
a9ae4692 | 1150 | if (plane_no >= vb->num_planes || !vb->planes[plane_no].mem_priv) |
e23ccc0a PO |
1151 | return NULL; |
1152 | ||
a1d36d8c | 1153 | return call_ptr_memop(vb, cookie, vb->planes[plane_no].mem_priv); |
e23ccc0a PO |
1154 | } |
1155 | EXPORT_SYMBOL_GPL(vb2_plane_cookie); | |
1156 | ||
1157 | /** | |
1158 | * vb2_buffer_done() - inform videobuf that an operation on a buffer is finished | |
1159 | * @vb: vb2_buffer returned from the driver | |
ce0eff01 HV |
1160 | * @state: either VB2_BUF_STATE_DONE if the operation finished successfully, |
1161 | * VB2_BUF_STATE_ERROR if the operation finished with an error or | |
1162 | * VB2_BUF_STATE_QUEUED if the driver wants to requeue buffers. | |
b3379c62 HV |
1163 | * If start_streaming fails then it should return buffers with state |
1164 | * VB2_BUF_STATE_QUEUED to put them back into the queue. | |
e23ccc0a PO |
1165 | * |
1166 | * This function should be called by the driver after a hardware operation on | |
1167 | * a buffer is finished and the buffer may be returned to userspace. The driver | |
1168 | * cannot use this buffer anymore until it is queued back to it by videobuf | |
1169 | * by the means of buf_queue callback. Only buffers previously queued to the | |
1170 | * driver by buf_queue can be passed to this function. | |
b3379c62 HV |
1171 | * |
1172 | * While streaming a buffer can only be returned in state DONE or ERROR. | |
1173 | * The start_streaming op can also return them in case the DMA engine cannot | |
1174 | * be started for some reason. In that case the buffers should be returned with | |
1175 | * state QUEUED. | |
e23ccc0a PO |
1176 | */ |
1177 | void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state) | |
1178 | { | |
1179 | struct vb2_queue *q = vb->vb2_queue; | |
1180 | unsigned long flags; | |
3e0c2f20 | 1181 | unsigned int plane; |
e23ccc0a | 1182 | |
b3379c62 | 1183 | if (WARN_ON(vb->state != VB2_BUF_STATE_ACTIVE)) |
e23ccc0a PO |
1184 | return; |
1185 | ||
bf3593d9 HV |
1186 | if (WARN_ON(state != VB2_BUF_STATE_DONE && |
1187 | state != VB2_BUF_STATE_ERROR && | |
6d058c56 SA |
1188 | state != VB2_BUF_STATE_QUEUED && |
1189 | state != VB2_BUF_STATE_REQUEUEING)) | |
bf3593d9 | 1190 | state = VB2_BUF_STATE_ERROR; |
e23ccc0a | 1191 | |
b5b4541e HV |
1192 | #ifdef CONFIG_VIDEO_ADV_DEBUG |
1193 | /* | |
1194 | * Although this is not a callback, it still does have to balance | |
1195 | * with the buf_queue op. So update this counter manually. | |
1196 | */ | |
1197 | vb->cnt_buf_done++; | |
1198 | #endif | |
3050040b | 1199 | dprintk(4, "done processing on buffer %d, state: %d\n", |
9b6f5dc0 | 1200 | vb->v4l2_buf.index, state); |
e23ccc0a | 1201 | |
3e0c2f20 MS |
1202 | /* sync buffers */ |
1203 | for (plane = 0; plane < vb->num_planes; ++plane) | |
a1d36d8c | 1204 | call_void_memop(vb, finish, vb->planes[plane].mem_priv); |
3e0c2f20 | 1205 | |
e23ccc0a | 1206 | spin_lock_irqsave(&q->done_lock, flags); |
6d058c56 SA |
1207 | if (state == VB2_BUF_STATE_QUEUED || |
1208 | state == VB2_BUF_STATE_REQUEUEING) { | |
1209 | vb->state = VB2_BUF_STATE_QUEUED; | |
1210 | } else { | |
1211 | /* Add the buffer to the done buffers list */ | |
b3379c62 | 1212 | list_add_tail(&vb->done_entry, &q->done_list); |
6d058c56 SA |
1213 | vb->state = state; |
1214 | } | |
6ea3b980 | 1215 | atomic_dec(&q->owned_by_drv_count); |
e23ccc0a PO |
1216 | spin_unlock_irqrestore(&q->done_lock, flags); |
1217 | ||
2091f518 PZ |
1218 | trace_vb2_buf_done(q, vb); |
1219 | ||
6d058c56 SA |
1220 | switch (state) { |
1221 | case VB2_BUF_STATE_QUEUED: | |
1222 | return; | |
1223 | case VB2_BUF_STATE_REQUEUEING: | |
ce0eff01 HV |
1224 | if (q->start_streaming_called) |
1225 | __enqueue_in_driver(vb); | |
b3379c62 | 1226 | return; |
6d058c56 SA |
1227 | default: |
1228 | /* Inform any processes that may be waiting for buffers */ | |
1229 | wake_up(&q->done_wq); | |
1230 | break; | |
ce0eff01 | 1231 | } |
e23ccc0a PO |
1232 | } |
1233 | EXPORT_SYMBOL_GPL(vb2_buffer_done); | |
1234 | ||
34ea4d44 LP |
1235 | /** |
1236 | * vb2_discard_done() - discard all buffers marked as DONE | |
1237 | * @q: videobuf2 queue | |
1238 | * | |
1239 | * This function is intended to be used with suspend/resume operations. It | |
1240 | * discards all 'done' buffers as they would be too old to be requested after | |
1241 | * resume. | |
1242 | * | |
1243 | * Drivers must stop the hardware and synchronize with interrupt handlers and/or | |
1244 | * delayed works before calling this function to make sure no buffer will be | |
1245 | * touched by the driver and/or hardware. | |
1246 | */ | |
1247 | void vb2_discard_done(struct vb2_queue *q) | |
1248 | { | |
1249 | struct vb2_buffer *vb; | |
1250 | unsigned long flags; | |
1251 | ||
1252 | spin_lock_irqsave(&q->done_lock, flags); | |
1253 | list_for_each_entry(vb, &q->done_list, done_entry) | |
1254 | vb->state = VB2_BUF_STATE_ERROR; | |
1255 | spin_unlock_irqrestore(&q->done_lock, flags); | |
1256 | } | |
1257 | EXPORT_SYMBOL_GPL(vb2_discard_done); | |
1258 | ||
77a3c6fd LP |
1259 | static void vb2_warn_zero_bytesused(struct vb2_buffer *vb) |
1260 | { | |
2fa3dc4e | 1261 | static bool check_once; |
77a3c6fd | 1262 | |
2fa3dc4e | 1263 | if (check_once) |
77a3c6fd LP |
1264 | return; |
1265 | ||
2fa3dc4e LP |
1266 | check_once = true; |
1267 | WARN_ON(1); | |
77a3c6fd | 1268 | |
2fa3dc4e | 1269 | pr_warn("use of bytesused == 0 is deprecated and will be removed in the future,\n"); |
77a3c6fd | 1270 | if (vb->vb2_queue->allow_zero_bytesused) |
2fa3dc4e | 1271 | pr_warn("use VIDIOC_DECODER_CMD(V4L2_DEC_CMD_STOP) instead.\n"); |
77a3c6fd | 1272 | else |
2fa3dc4e | 1273 | pr_warn("use the actual size instead.\n"); |
77a3c6fd LP |
1274 | } |
1275 | ||
e23ccc0a | 1276 | /** |
32a77260 HV |
1277 | * __fill_vb2_buffer() - fill a vb2_buffer with information provided in a |
1278 | * v4l2_buffer by the userspace. The caller has already verified that struct | |
1279 | * v4l2_buffer has a valid number of planes. | |
e23ccc0a | 1280 | */ |
32a77260 | 1281 | static void __fill_vb2_buffer(struct vb2_buffer *vb, const struct v4l2_buffer *b, |
e23ccc0a PO |
1282 | struct v4l2_plane *v4l2_planes) |
1283 | { | |
1284 | unsigned int plane; | |
e23ccc0a PO |
1285 | |
1286 | if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) { | |
e23ccc0a PO |
1287 | if (b->memory == V4L2_MEMORY_USERPTR) { |
1288 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
1289 | v4l2_planes[plane].m.userptr = | |
1290 | b->m.planes[plane].m.userptr; | |
1291 | v4l2_planes[plane].length = | |
1292 | b->m.planes[plane].length; | |
1293 | } | |
1294 | } | |
c5384048 SS |
1295 | if (b->memory == V4L2_MEMORY_DMABUF) { |
1296 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
1297 | v4l2_planes[plane].m.fd = | |
1298 | b->m.planes[plane].m.fd; | |
1299 | v4l2_planes[plane].length = | |
1300 | b->m.planes[plane].length; | |
c5384048 SS |
1301 | } |
1302 | } | |
8a75ffb8 HV |
1303 | |
1304 | /* Fill in driver-provided information for OUTPUT types */ | |
1305 | if (V4L2_TYPE_IS_OUTPUT(b->type)) { | |
1306 | /* | |
1307 | * Will have to go up to b->length when API starts | |
1308 | * accepting variable number of planes. | |
1309 | * | |
1310 | * If bytesused == 0 for the output buffer, then fall | |
1311 | * back to the full buffer size. In that case | |
1312 | * userspace clearly never bothered to set it and | |
1313 | * it's a safe assumption that they really meant to | |
1314 | * use the full plane sizes. | |
f61bf13b KD |
1315 | * |
1316 | * Some drivers, e.g. old codec drivers, use bytesused == 0 | |
1317 | * as a way to indicate that streaming is finished. | |
1318 | * In that case, the driver should use the | |
1319 | * allow_zero_bytesused flag to keep old userspace | |
1320 | * applications working. | |
8a75ffb8 HV |
1321 | */ |
1322 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
1323 | struct v4l2_plane *pdst = &v4l2_planes[plane]; | |
1324 | struct v4l2_plane *psrc = &b->m.planes[plane]; | |
1325 | ||
77a3c6fd LP |
1326 | if (psrc->bytesused == 0) |
1327 | vb2_warn_zero_bytesused(vb); | |
1328 | ||
f61bf13b KD |
1329 | if (vb->vb2_queue->allow_zero_bytesused) |
1330 | pdst->bytesused = psrc->bytesused; | |
1331 | else | |
1332 | pdst->bytesused = psrc->bytesused ? | |
1333 | psrc->bytesused : pdst->length; | |
8a75ffb8 HV |
1334 | pdst->data_offset = psrc->data_offset; |
1335 | } | |
1336 | } | |
e23ccc0a PO |
1337 | } else { |
1338 | /* | |
1339 | * Single-planar buffers do not use planes array, | |
1340 | * so fill in relevant v4l2_buffer struct fields instead. | |
1341 | * In videobuf we use our internal V4l2_planes struct for | |
1342 | * single-planar buffers as well, for simplicity. | |
61bd8fb3 | 1343 | * |
8a75ffb8 HV |
1344 | * If bytesused == 0 for the output buffer, then fall back |
1345 | * to the full buffer size as that's a sensible default. | |
f61bf13b KD |
1346 | * |
1347 | * Some drivers, e.g. old codec drivers, use bytesused == 0 as | |
1348 | * a way to indicate that streaming is finished. In that case, | |
1349 | * the driver should use the allow_zero_bytesused flag to keep | |
1350 | * old userspace applications working. | |
e23ccc0a | 1351 | */ |
e23ccc0a PO |
1352 | if (b->memory == V4L2_MEMORY_USERPTR) { |
1353 | v4l2_planes[0].m.userptr = b->m.userptr; | |
1354 | v4l2_planes[0].length = b->length; | |
1355 | } | |
c5384048 SS |
1356 | |
1357 | if (b->memory == V4L2_MEMORY_DMABUF) { | |
1358 | v4l2_planes[0].m.fd = b->m.fd; | |
1359 | v4l2_planes[0].length = b->length; | |
c5384048 | 1360 | } |
8a75ffb8 | 1361 | |
f61bf13b | 1362 | if (V4L2_TYPE_IS_OUTPUT(b->type)) { |
77a3c6fd LP |
1363 | if (b->bytesused == 0) |
1364 | vb2_warn_zero_bytesused(vb); | |
1365 | ||
f61bf13b KD |
1366 | if (vb->vb2_queue->allow_zero_bytesused) |
1367 | v4l2_planes[0].bytesused = b->bytesused; | |
1368 | else | |
1369 | v4l2_planes[0].bytesused = b->bytesused ? | |
1370 | b->bytesused : v4l2_planes[0].length; | |
1371 | } else | |
8a75ffb8 HV |
1372 | v4l2_planes[0].bytesused = 0; |
1373 | ||
e23ccc0a PO |
1374 | } |
1375 | ||
f1343281 | 1376 | /* Zero flags that the vb2 core handles */ |
1b18e7a0 | 1377 | vb->v4l2_buf.flags = b->flags & ~V4L2_BUFFER_MASK_FLAGS; |
7ce6fd8f SA |
1378 | if ((vb->vb2_queue->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) != |
1379 | V4L2_BUF_FLAG_TIMESTAMP_COPY || !V4L2_TYPE_IS_OUTPUT(b->type)) { | |
1380 | /* | |
1381 | * Non-COPY timestamps and non-OUTPUT queues will get | |
1382 | * their timestamp and timestamp source flags from the | |
1383 | * queue. | |
1384 | */ | |
1385 | vb->v4l2_buf.flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK; | |
1386 | } | |
1387 | ||
f1343281 HV |
1388 | if (V4L2_TYPE_IS_OUTPUT(b->type)) { |
1389 | /* | |
1390 | * For output buffers mask out the timecode flag: | |
1391 | * this will be handled later in vb2_internal_qbuf(). | |
1392 | * The 'field' is valid metadata for this output buffer | |
1393 | * and so that needs to be copied here. | |
1394 | */ | |
1395 | vb->v4l2_buf.flags &= ~V4L2_BUF_FLAG_TIMECODE; | |
1396 | vb->v4l2_buf.field = b->field; | |
1397 | } else { | |
1398 | /* Zero any output buffer flags as this is a capture buffer */ | |
1399 | vb->v4l2_buf.flags &= ~V4L2_BUFFER_OUT_FLAGS; | |
1400 | } | |
e23ccc0a PO |
1401 | } |
1402 | ||
dcc2428a HV |
1403 | /** |
1404 | * __qbuf_mmap() - handle qbuf of an MMAP buffer | |
1405 | */ | |
1406 | static int __qbuf_mmap(struct vb2_buffer *vb, const struct v4l2_buffer *b) | |
1407 | { | |
1408 | __fill_vb2_buffer(vb, b, vb->v4l2_planes); | |
1409 | return call_vb_qop(vb, buf_prepare, vb); | |
1410 | } | |
1411 | ||
e23ccc0a PO |
1412 | /** |
1413 | * __qbuf_userptr() - handle qbuf of a USERPTR buffer | |
1414 | */ | |
2d86401c | 1415 | static int __qbuf_userptr(struct vb2_buffer *vb, const struct v4l2_buffer *b) |
e23ccc0a PO |
1416 | { |
1417 | struct v4l2_plane planes[VIDEO_MAX_PLANES]; | |
1418 | struct vb2_queue *q = vb->vb2_queue; | |
1419 | void *mem_priv; | |
1420 | unsigned int plane; | |
1421 | int ret; | |
cd474037 HV |
1422 | enum dma_data_direction dma_dir = |
1423 | V4L2_TYPE_IS_OUTPUT(q->type) ? DMA_TO_DEVICE : DMA_FROM_DEVICE; | |
256f3162 | 1424 | bool reacquired = vb->planes[0].mem_priv == NULL; |
e23ccc0a | 1425 | |
412376a1 | 1426 | memset(planes, 0, sizeof(planes[0]) * vb->num_planes); |
32a77260 HV |
1427 | /* Copy relevant information provided by the userspace */ |
1428 | __fill_vb2_buffer(vb, b, planes); | |
e23ccc0a PO |
1429 | |
1430 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
1431 | /* Skip the plane if already verified */ | |
f0b7c7fc MS |
1432 | if (vb->v4l2_planes[plane].m.userptr && |
1433 | vb->v4l2_planes[plane].m.userptr == planes[plane].m.userptr | |
e23ccc0a PO |
1434 | && vb->v4l2_planes[plane].length == planes[plane].length) |
1435 | continue; | |
1436 | ||
fd4354cf | 1437 | dprintk(3, "userspace address for plane %d changed, " |
e23ccc0a PO |
1438 | "reacquiring memory\n", plane); |
1439 | ||
c1426bc7 MS |
1440 | /* Check if the provided plane buffer is large enough */ |
1441 | if (planes[plane].length < q->plane_sizes[plane]) { | |
fd4354cf | 1442 | dprintk(1, "provided buffer size %u is less than " |
2484a7e2 SWK |
1443 | "setup size %u for plane %d\n", |
1444 | planes[plane].length, | |
1445 | q->plane_sizes[plane], plane); | |
4c2625db | 1446 | ret = -EINVAL; |
c1426bc7 MS |
1447 | goto err; |
1448 | } | |
1449 | ||
e23ccc0a | 1450 | /* Release previously acquired memory if present */ |
256f3162 HV |
1451 | if (vb->planes[plane].mem_priv) { |
1452 | if (!reacquired) { | |
1453 | reacquired = true; | |
a1d36d8c | 1454 | call_void_vb_qop(vb, buf_cleanup, vb); |
256f3162 | 1455 | } |
a1d36d8c | 1456 | call_void_memop(vb, put_userptr, vb->planes[plane].mem_priv); |
256f3162 | 1457 | } |
e23ccc0a PO |
1458 | |
1459 | vb->planes[plane].mem_priv = NULL; | |
256f3162 | 1460 | memset(&vb->v4l2_planes[plane], 0, sizeof(struct v4l2_plane)); |
e23ccc0a PO |
1461 | |
1462 | /* Acquire each plane's memory */ | |
a1d36d8c | 1463 | mem_priv = call_ptr_memop(vb, get_userptr, q->alloc_ctx[plane], |
a00d0266 | 1464 | planes[plane].m.userptr, |
cd474037 | 1465 | planes[plane].length, dma_dir); |
a00d0266 | 1466 | if (IS_ERR_OR_NULL(mem_priv)) { |
fd4354cf | 1467 | dprintk(1, "failed acquiring userspace " |
e23ccc0a | 1468 | "memory for plane %d\n", plane); |
a00d0266 MS |
1469 | ret = mem_priv ? PTR_ERR(mem_priv) : -EINVAL; |
1470 | goto err; | |
e23ccc0a | 1471 | } |
a00d0266 | 1472 | vb->planes[plane].mem_priv = mem_priv; |
e23ccc0a PO |
1473 | } |
1474 | ||
e23ccc0a PO |
1475 | /* |
1476 | * Now that everything is in order, copy relevant information | |
1477 | * provided by userspace. | |
1478 | */ | |
1479 | for (plane = 0; plane < vb->num_planes; ++plane) | |
1480 | vb->v4l2_planes[plane] = planes[plane]; | |
1481 | ||
256f3162 HV |
1482 | if (reacquired) { |
1483 | /* | |
1484 | * One or more planes changed, so we must call buf_init to do | |
1485 | * the driver-specific initialization on the newly acquired | |
1486 | * buffer, if provided. | |
1487 | */ | |
1488 | ret = call_vb_qop(vb, buf_init, vb); | |
1489 | if (ret) { | |
fd4354cf | 1490 | dprintk(1, "buffer initialization failed\n"); |
256f3162 HV |
1491 | goto err; |
1492 | } | |
1493 | } | |
1494 | ||
1495 | ret = call_vb_qop(vb, buf_prepare, vb); | |
1496 | if (ret) { | |
fd4354cf | 1497 | dprintk(1, "buffer preparation failed\n"); |
a1d36d8c | 1498 | call_void_vb_qop(vb, buf_cleanup, vb); |
256f3162 HV |
1499 | goto err; |
1500 | } | |
1501 | ||
e23ccc0a PO |
1502 | return 0; |
1503 | err: | |
1504 | /* In case of errors, release planes that were already acquired */ | |
c1426bc7 MS |
1505 | for (plane = 0; plane < vb->num_planes; ++plane) { |
1506 | if (vb->planes[plane].mem_priv) | |
a1d36d8c | 1507 | call_void_memop(vb, put_userptr, vb->planes[plane].mem_priv); |
c1426bc7 MS |
1508 | vb->planes[plane].mem_priv = NULL; |
1509 | vb->v4l2_planes[plane].m.userptr = 0; | |
1510 | vb->v4l2_planes[plane].length = 0; | |
e23ccc0a PO |
1511 | } |
1512 | ||
1513 | return ret; | |
1514 | } | |
1515 | ||
c5384048 SS |
1516 | /** |
1517 | * __qbuf_dmabuf() - handle qbuf of a DMABUF buffer | |
1518 | */ | |
1519 | static int __qbuf_dmabuf(struct vb2_buffer *vb, const struct v4l2_buffer *b) | |
1520 | { | |
1521 | struct v4l2_plane planes[VIDEO_MAX_PLANES]; | |
1522 | struct vb2_queue *q = vb->vb2_queue; | |
1523 | void *mem_priv; | |
1524 | unsigned int plane; | |
1525 | int ret; | |
cd474037 HV |
1526 | enum dma_data_direction dma_dir = |
1527 | V4L2_TYPE_IS_OUTPUT(q->type) ? DMA_TO_DEVICE : DMA_FROM_DEVICE; | |
256f3162 | 1528 | bool reacquired = vb->planes[0].mem_priv == NULL; |
c5384048 | 1529 | |
412376a1 | 1530 | memset(planes, 0, sizeof(planes[0]) * vb->num_planes); |
6f546c5f | 1531 | /* Copy relevant information provided by the userspace */ |
c5384048 SS |
1532 | __fill_vb2_buffer(vb, b, planes); |
1533 | ||
1534 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
1535 | struct dma_buf *dbuf = dma_buf_get(planes[plane].m.fd); | |
1536 | ||
1537 | if (IS_ERR_OR_NULL(dbuf)) { | |
fd4354cf | 1538 | dprintk(1, "invalid dmabuf fd for plane %d\n", |
c5384048 SS |
1539 | plane); |
1540 | ret = -EINVAL; | |
1541 | goto err; | |
1542 | } | |
1543 | ||
1544 | /* use DMABUF size if length is not provided */ | |
1545 | if (planes[plane].length == 0) | |
1546 | planes[plane].length = dbuf->size; | |
1547 | ||
412376a1 | 1548 | if (planes[plane].length < q->plane_sizes[plane]) { |
fd4354cf | 1549 | dprintk(1, "invalid dmabuf length for plane %d\n", |
77c0782e | 1550 | plane); |
c5384048 SS |
1551 | ret = -EINVAL; |
1552 | goto err; | |
1553 | } | |
1554 | ||
1555 | /* Skip the plane if already verified */ | |
1556 | if (dbuf == vb->planes[plane].dbuf && | |
1557 | vb->v4l2_planes[plane].length == planes[plane].length) { | |
1558 | dma_buf_put(dbuf); | |
1559 | continue; | |
1560 | } | |
1561 | ||
fd4354cf | 1562 | dprintk(1, "buffer for plane %d changed\n", plane); |
c5384048 | 1563 | |
256f3162 HV |
1564 | if (!reacquired) { |
1565 | reacquired = true; | |
a1d36d8c | 1566 | call_void_vb_qop(vb, buf_cleanup, vb); |
256f3162 HV |
1567 | } |
1568 | ||
c5384048 | 1569 | /* Release previously acquired memory if present */ |
b5b4541e | 1570 | __vb2_plane_dmabuf_put(vb, &vb->planes[plane]); |
c5384048 SS |
1571 | memset(&vb->v4l2_planes[plane], 0, sizeof(struct v4l2_plane)); |
1572 | ||
1573 | /* Acquire each plane's memory */ | |
a1d36d8c | 1574 | mem_priv = call_ptr_memop(vb, attach_dmabuf, q->alloc_ctx[plane], |
cd474037 | 1575 | dbuf, planes[plane].length, dma_dir); |
c5384048 | 1576 | if (IS_ERR(mem_priv)) { |
fd4354cf | 1577 | dprintk(1, "failed to attach dmabuf\n"); |
c5384048 SS |
1578 | ret = PTR_ERR(mem_priv); |
1579 | dma_buf_put(dbuf); | |
1580 | goto err; | |
1581 | } | |
1582 | ||
1583 | vb->planes[plane].dbuf = dbuf; | |
1584 | vb->planes[plane].mem_priv = mem_priv; | |
1585 | } | |
1586 | ||
1587 | /* TODO: This pins the buffer(s) with dma_buf_map_attachment()).. but | |
1588 | * really we want to do this just before the DMA, not while queueing | |
1589 | * the buffer(s).. | |
1590 | */ | |
1591 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
b5b4541e | 1592 | ret = call_memop(vb, map_dmabuf, vb->planes[plane].mem_priv); |
c5384048 | 1593 | if (ret) { |
fd4354cf | 1594 | dprintk(1, "failed to map dmabuf for plane %d\n", |
c5384048 SS |
1595 | plane); |
1596 | goto err; | |
1597 | } | |
1598 | vb->planes[plane].dbuf_mapped = 1; | |
1599 | } | |
1600 | ||
c5384048 SS |
1601 | /* |
1602 | * Now that everything is in order, copy relevant information | |
1603 | * provided by userspace. | |
1604 | */ | |
1605 | for (plane = 0; plane < vb->num_planes; ++plane) | |
1606 | vb->v4l2_planes[plane] = planes[plane]; | |
1607 | ||
256f3162 HV |
1608 | if (reacquired) { |
1609 | /* | |
1610 | * Call driver-specific initialization on the newly acquired buffer, | |
1611 | * if provided. | |
1612 | */ | |
1613 | ret = call_vb_qop(vb, buf_init, vb); | |
1614 | if (ret) { | |
fd4354cf | 1615 | dprintk(1, "buffer initialization failed\n"); |
256f3162 HV |
1616 | goto err; |
1617 | } | |
1618 | } | |
1619 | ||
1620 | ret = call_vb_qop(vb, buf_prepare, vb); | |
1621 | if (ret) { | |
fd4354cf | 1622 | dprintk(1, "buffer preparation failed\n"); |
a1d36d8c | 1623 | call_void_vb_qop(vb, buf_cleanup, vb); |
256f3162 HV |
1624 | goto err; |
1625 | } | |
1626 | ||
c5384048 SS |
1627 | return 0; |
1628 | err: | |
1629 | /* In case of errors, release planes that were already acquired */ | |
1630 | __vb2_buf_dmabuf_put(vb); | |
1631 | ||
1632 | return ret; | |
1633 | } | |
1634 | ||
e23ccc0a PO |
1635 | /** |
1636 | * __enqueue_in_driver() - enqueue a vb2_buffer in driver for processing | |
1637 | */ | |
1638 | static void __enqueue_in_driver(struct vb2_buffer *vb) | |
1639 | { | |
1640 | struct vb2_queue *q = vb->vb2_queue; | |
3e0c2f20 | 1641 | unsigned int plane; |
e23ccc0a PO |
1642 | |
1643 | vb->state = VB2_BUF_STATE_ACTIVE; | |
6ea3b980 | 1644 | atomic_inc(&q->owned_by_drv_count); |
3e0c2f20 | 1645 | |
2091f518 PZ |
1646 | trace_vb2_buf_queue(q, vb); |
1647 | ||
3e0c2f20 MS |
1648 | /* sync buffers */ |
1649 | for (plane = 0; plane < vb->num_planes; ++plane) | |
a1d36d8c | 1650 | call_void_memop(vb, prepare, vb->planes[plane].mem_priv); |
3e0c2f20 | 1651 | |
a1d36d8c | 1652 | call_void_vb_qop(vb, buf_queue, vb); |
e23ccc0a PO |
1653 | } |
1654 | ||
2d86401c | 1655 | static int __buf_prepare(struct vb2_buffer *vb, const struct v4l2_buffer *b) |
ebc087d0 GL |
1656 | { |
1657 | struct vb2_queue *q = vb->vb2_queue; | |
1658 | int ret; | |
1659 | ||
8023ed09 | 1660 | ret = __verify_length(vb, b); |
3a9621b0 | 1661 | if (ret < 0) { |
fd4354cf | 1662 | dprintk(1, "plane parameters verification failed: %d\n", ret); |
8023ed09 | 1663 | return ret; |
3a9621b0 | 1664 | } |
e35e41b5 HV |
1665 | if (b->field == V4L2_FIELD_ALTERNATE && V4L2_TYPE_IS_OUTPUT(q->type)) { |
1666 | /* | |
1667 | * If the format's field is ALTERNATE, then the buffer's field | |
1668 | * should be either TOP or BOTTOM, not ALTERNATE since that | |
1669 | * makes no sense. The driver has to know whether the | |
1670 | * buffer represents a top or a bottom field in order to | |
1671 | * program any DMA correctly. Using ALTERNATE is wrong, since | |
1672 | * that just says that it is either a top or a bottom field, | |
1673 | * but not which of the two it is. | |
1674 | */ | |
1675 | dprintk(1, "the field is incorrectly set to ALTERNATE for an output buffer\n"); | |
1676 | return -EINVAL; | |
1677 | } | |
8023ed09 | 1678 | |
4bb7267d LP |
1679 | if (q->error) { |
1680 | dprintk(1, "fatal error occurred on queue\n"); | |
1681 | return -EIO; | |
1682 | } | |
1683 | ||
b18a8ff2 | 1684 | vb->state = VB2_BUF_STATE_PREPARING; |
f1343281 HV |
1685 | vb->v4l2_buf.timestamp.tv_sec = 0; |
1686 | vb->v4l2_buf.timestamp.tv_usec = 0; | |
1687 | vb->v4l2_buf.sequence = 0; | |
1688 | ||
ebc087d0 GL |
1689 | switch (q->memory) { |
1690 | case V4L2_MEMORY_MMAP: | |
1691 | ret = __qbuf_mmap(vb, b); | |
1692 | break; | |
1693 | case V4L2_MEMORY_USERPTR: | |
1694 | ret = __qbuf_userptr(vb, b); | |
1695 | break; | |
c5384048 SS |
1696 | case V4L2_MEMORY_DMABUF: |
1697 | ret = __qbuf_dmabuf(vb, b); | |
1698 | break; | |
ebc087d0 GL |
1699 | default: |
1700 | WARN(1, "Invalid queue type\n"); | |
1701 | ret = -EINVAL; | |
1702 | } | |
1703 | ||
ebc087d0 | 1704 | if (ret) |
fd4354cf | 1705 | dprintk(1, "buffer preparation failed: %d\n", ret); |
b18a8ff2 | 1706 | vb->state = ret ? VB2_BUF_STATE_DEQUEUED : VB2_BUF_STATE_PREPARED; |
ebc087d0 GL |
1707 | |
1708 | return ret; | |
1709 | } | |
1710 | ||
012043b8 | 1711 | static int vb2_queue_or_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b, |
4138111a | 1712 | const char *opname) |
2d86401c | 1713 | { |
2d86401c | 1714 | if (b->type != q->type) { |
fd4354cf | 1715 | dprintk(1, "%s: invalid buffer type\n", opname); |
b18a8ff2 | 1716 | return -EINVAL; |
2d86401c GL |
1717 | } |
1718 | ||
1719 | if (b->index >= q->num_buffers) { | |
fd4354cf | 1720 | dprintk(1, "%s: buffer index out of range\n", opname); |
b18a8ff2 | 1721 | return -EINVAL; |
2d86401c GL |
1722 | } |
1723 | ||
4138111a | 1724 | if (q->bufs[b->index] == NULL) { |
2d86401c | 1725 | /* Should never happen */ |
fd4354cf | 1726 | dprintk(1, "%s: buffer is NULL\n", opname); |
b18a8ff2 | 1727 | return -EINVAL; |
2d86401c GL |
1728 | } |
1729 | ||
1730 | if (b->memory != q->memory) { | |
fd4354cf | 1731 | dprintk(1, "%s: invalid memory type\n", opname); |
b18a8ff2 | 1732 | return -EINVAL; |
2d86401c GL |
1733 | } |
1734 | ||
4138111a | 1735 | return __verify_planes_array(q->bufs[b->index], b); |
012043b8 | 1736 | } |
2d86401c | 1737 | |
e23ccc0a | 1738 | /** |
012043b8 | 1739 | * vb2_prepare_buf() - Pass ownership of a buffer from userspace to the kernel |
e23ccc0a | 1740 | * @q: videobuf2 queue |
012043b8 LP |
1741 | * @b: buffer structure passed from userspace to vidioc_prepare_buf |
1742 | * handler in driver | |
e23ccc0a | 1743 | * |
012043b8 | 1744 | * Should be called from vidioc_prepare_buf ioctl handler of a driver. |
e23ccc0a PO |
1745 | * This function: |
1746 | * 1) verifies the passed buffer, | |
012043b8 LP |
1747 | * 2) calls buf_prepare callback in the driver (if provided), in which |
1748 | * driver-specific buffer initialization can be performed, | |
e23ccc0a PO |
1749 | * |
1750 | * The return values from this function are intended to be directly returned | |
012043b8 | 1751 | * from vidioc_prepare_buf handler in driver. |
e23ccc0a | 1752 | */ |
012043b8 | 1753 | int vb2_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b) |
e23ccc0a | 1754 | { |
4138111a | 1755 | struct vb2_buffer *vb; |
b2f2f047 HV |
1756 | int ret; |
1757 | ||
74753cff | 1758 | if (vb2_fileio_is_active(q)) { |
fd4354cf | 1759 | dprintk(1, "file io in progress\n"); |
b2f2f047 HV |
1760 | return -EBUSY; |
1761 | } | |
4138111a | 1762 | |
b2f2f047 | 1763 | ret = vb2_queue_or_prepare_buf(q, b, "prepare_buf"); |
4138111a HV |
1764 | if (ret) |
1765 | return ret; | |
1766 | ||
1767 | vb = q->bufs[b->index]; | |
1768 | if (vb->state != VB2_BUF_STATE_DEQUEUED) { | |
fd4354cf | 1769 | dprintk(1, "invalid buffer state %d\n", |
4138111a HV |
1770 | vb->state); |
1771 | return -EINVAL; | |
1772 | } | |
1773 | ||
1774 | ret = __buf_prepare(vb, b); | |
1775 | if (!ret) { | |
1776 | /* Fill buffer information for the userspace */ | |
1777 | __fill_v4l2_buffer(vb, b); | |
1778 | ||
fd4354cf | 1779 | dprintk(1, "prepare of buffer %d succeeded\n", vb->v4l2_buf.index); |
4138111a HV |
1780 | } |
1781 | return ret; | |
012043b8 LP |
1782 | } |
1783 | EXPORT_SYMBOL_GPL(vb2_prepare_buf); | |
e23ccc0a | 1784 | |
02f142ec HV |
1785 | /** |
1786 | * vb2_start_streaming() - Attempt to start streaming. | |
1787 | * @q: videobuf2 queue | |
1788 | * | |
b3379c62 HV |
1789 | * Attempt to start streaming. When this function is called there must be |
1790 | * at least q->min_buffers_needed buffers queued up (i.e. the minimum | |
1791 | * number of buffers required for the DMA engine to function). If the | |
1792 | * @start_streaming op fails it is supposed to return all the driver-owned | |
1793 | * buffers back to vb2 in state QUEUED. Check if that happened and if | |
1794 | * not warn and reclaim them forcefully. | |
02f142ec HV |
1795 | */ |
1796 | static int vb2_start_streaming(struct vb2_queue *q) | |
1797 | { | |
b3379c62 | 1798 | struct vb2_buffer *vb; |
02f142ec HV |
1799 | int ret; |
1800 | ||
02f142ec | 1801 | /* |
b3379c62 HV |
1802 | * If any buffers were queued before streamon, |
1803 | * we can now pass them to driver for processing. | |
02f142ec | 1804 | */ |
b3379c62 HV |
1805 | list_for_each_entry(vb, &q->queued_list, queued_entry) |
1806 | __enqueue_in_driver(vb); | |
1807 | ||
1808 | /* Tell the driver to start streaming */ | |
bd994ddb | 1809 | q->start_streaming_called = 1; |
b3379c62 HV |
1810 | ret = call_qop(q, start_streaming, q, |
1811 | atomic_read(&q->owned_by_drv_count)); | |
b3379c62 | 1812 | if (!ret) |
02f142ec | 1813 | return 0; |
b3379c62 | 1814 | |
bd994ddb LP |
1815 | q->start_streaming_called = 0; |
1816 | ||
fd4354cf | 1817 | dprintk(1, "driver refused to start streaming\n"); |
23cd08c8 HV |
1818 | /* |
1819 | * If you see this warning, then the driver isn't cleaning up properly | |
1820 | * after a failed start_streaming(). See the start_streaming() | |
1821 | * documentation in videobuf2-core.h for more information how buffers | |
1822 | * should be returned to vb2 in start_streaming(). | |
1823 | */ | |
b3379c62 HV |
1824 | if (WARN_ON(atomic_read(&q->owned_by_drv_count))) { |
1825 | unsigned i; | |
1826 | ||
1827 | /* | |
1828 | * Forcefully reclaim buffers if the driver did not | |
1829 | * correctly return them to vb2. | |
1830 | */ | |
1831 | for (i = 0; i < q->num_buffers; ++i) { | |
1832 | vb = q->bufs[i]; | |
1833 | if (vb->state == VB2_BUF_STATE_ACTIVE) | |
1834 | vb2_buffer_done(vb, VB2_BUF_STATE_QUEUED); | |
1835 | } | |
1836 | /* Must be zero now */ | |
1837 | WARN_ON(atomic_read(&q->owned_by_drv_count)); | |
02f142ec | 1838 | } |
bf3593d9 HV |
1839 | /* |
1840 | * If done_list is not empty, then start_streaming() didn't call | |
1841 | * vb2_buffer_done(vb, VB2_BUF_STATE_QUEUED) but STATE_ERROR or | |
1842 | * STATE_DONE. | |
1843 | */ | |
1844 | WARN_ON(!list_empty(&q->done_list)); | |
02f142ec HV |
1845 | return ret; |
1846 | } | |
1847 | ||
b2f2f047 | 1848 | static int vb2_internal_qbuf(struct vb2_queue *q, struct v4l2_buffer *b) |
012043b8 | 1849 | { |
4138111a HV |
1850 | int ret = vb2_queue_or_prepare_buf(q, b, "qbuf"); |
1851 | struct vb2_buffer *vb; | |
1852 | ||
1853 | if (ret) | |
1854 | return ret; | |
1855 | ||
1856 | vb = q->bufs[b->index]; | |
e23ccc0a | 1857 | |
ebc087d0 GL |
1858 | switch (vb->state) { |
1859 | case VB2_BUF_STATE_DEQUEUED: | |
1860 | ret = __buf_prepare(vb, b); | |
1861 | if (ret) | |
012043b8 | 1862 | return ret; |
4138111a | 1863 | break; |
ebc087d0 GL |
1864 | case VB2_BUF_STATE_PREPARED: |
1865 | break; | |
b18a8ff2 | 1866 | case VB2_BUF_STATE_PREPARING: |
fd4354cf | 1867 | dprintk(1, "buffer still being prepared\n"); |
b18a8ff2 | 1868 | return -EINVAL; |
ebc087d0 | 1869 | default: |
fd4354cf | 1870 | dprintk(1, "invalid buffer state %d\n", vb->state); |
012043b8 | 1871 | return -EINVAL; |
e23ccc0a PO |
1872 | } |
1873 | ||
e23ccc0a PO |
1874 | /* |
1875 | * Add to the queued buffers list, a buffer will stay on it until | |
1876 | * dequeued in dqbuf. | |
1877 | */ | |
1878 | list_add_tail(&vb->queued_entry, &q->queued_list); | |
b3379c62 | 1879 | q->queued_count++; |
58d75f4b | 1880 | q->waiting_for_buffers = false; |
e23ccc0a | 1881 | vb->state = VB2_BUF_STATE_QUEUED; |
f1343281 HV |
1882 | if (V4L2_TYPE_IS_OUTPUT(q->type)) { |
1883 | /* | |
1884 | * For output buffers copy the timestamp if needed, | |
1885 | * and the timecode field and flag if needed. | |
1886 | */ | |
c57ff792 SA |
1887 | if ((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == |
1888 | V4L2_BUF_FLAG_TIMESTAMP_COPY) | |
f1343281 HV |
1889 | vb->v4l2_buf.timestamp = b->timestamp; |
1890 | vb->v4l2_buf.flags |= b->flags & V4L2_BUF_FLAG_TIMECODE; | |
1891 | if (b->flags & V4L2_BUF_FLAG_TIMECODE) | |
1892 | vb->v4l2_buf.timecode = b->timecode; | |
1893 | } | |
e23ccc0a | 1894 | |
2091f518 PZ |
1895 | trace_vb2_qbuf(q, vb); |
1896 | ||
e23ccc0a PO |
1897 | /* |
1898 | * If already streaming, give the buffer to driver for processing. | |
1899 | * If not, the buffer will be given to driver on next streamon. | |
1900 | */ | |
b3379c62 | 1901 | if (q->start_streaming_called) |
e23ccc0a PO |
1902 | __enqueue_in_driver(vb); |
1903 | ||
4138111a HV |
1904 | /* Fill buffer information for the userspace */ |
1905 | __fill_v4l2_buffer(vb, b); | |
21db3e07 | 1906 | |
b3379c62 HV |
1907 | /* |
1908 | * If streamon has been called, and we haven't yet called | |
1909 | * start_streaming() since not enough buffers were queued, and | |
1910 | * we now have reached the minimum number of queued buffers, | |
1911 | * then we can finally call start_streaming(). | |
1912 | */ | |
1913 | if (q->streaming && !q->start_streaming_called && | |
1914 | q->queued_count >= q->min_buffers_needed) { | |
02f142ec HV |
1915 | ret = vb2_start_streaming(q); |
1916 | if (ret) | |
1917 | return ret; | |
1918 | } | |
1919 | ||
fd4354cf | 1920 | dprintk(1, "qbuf of buffer %d succeeded\n", vb->v4l2_buf.index); |
4138111a | 1921 | return 0; |
e23ccc0a | 1922 | } |
b2f2f047 HV |
1923 | |
1924 | /** | |
1925 | * vb2_qbuf() - Queue a buffer from userspace | |
1926 | * @q: videobuf2 queue | |
1927 | * @b: buffer structure passed from userspace to vidioc_qbuf handler | |
1928 | * in driver | |
1929 | * | |
1930 | * Should be called from vidioc_qbuf ioctl handler of a driver. | |
1931 | * This function: | |
1932 | * 1) verifies the passed buffer, | |
1933 | * 2) if necessary, calls buf_prepare callback in the driver (if provided), in | |
1934 | * which driver-specific buffer initialization can be performed, | |
1935 | * 3) if streaming is on, queues the buffer in driver by the means of buf_queue | |
1936 | * callback for processing. | |
1937 | * | |
1938 | * The return values from this function are intended to be directly returned | |
1939 | * from vidioc_qbuf handler in driver. | |
1940 | */ | |
1941 | int vb2_qbuf(struct vb2_queue *q, struct v4l2_buffer *b) | |
1942 | { | |
74753cff | 1943 | if (vb2_fileio_is_active(q)) { |
fd4354cf | 1944 | dprintk(1, "file io in progress\n"); |
b2f2f047 HV |
1945 | return -EBUSY; |
1946 | } | |
1947 | ||
1948 | return vb2_internal_qbuf(q, b); | |
1949 | } | |
e23ccc0a PO |
1950 | EXPORT_SYMBOL_GPL(vb2_qbuf); |
1951 | ||
1952 | /** | |
1953 | * __vb2_wait_for_done_vb() - wait for a buffer to become available | |
1954 | * for dequeuing | |
1955 | * | |
1956 | * Will sleep if required for nonblocking == false. | |
1957 | */ | |
1958 | static int __vb2_wait_for_done_vb(struct vb2_queue *q, int nonblocking) | |
1959 | { | |
1960 | /* | |
1961 | * All operations on vb_done_list are performed under done_lock | |
1962 | * spinlock protection. However, buffers may be removed from | |
1963 | * it and returned to userspace only while holding both driver's | |
1964 | * lock and the done_lock spinlock. Thus we can be sure that as | |
1965 | * long as we hold the driver's lock, the list will remain not | |
1966 | * empty if list_empty() check succeeds. | |
1967 | */ | |
1968 | ||
1969 | for (;;) { | |
1970 | int ret; | |
1971 | ||
1972 | if (!q->streaming) { | |
3050040b | 1973 | dprintk(1, "streaming off, will not wait for buffers\n"); |
e23ccc0a PO |
1974 | return -EINVAL; |
1975 | } | |
1976 | ||
4bb7267d LP |
1977 | if (q->error) { |
1978 | dprintk(1, "Queue in error state, will not wait for buffers\n"); | |
1979 | return -EIO; | |
1980 | } | |
1981 | ||
c1621840 PZ |
1982 | if (q->last_buffer_dequeued) { |
1983 | dprintk(3, "last buffer dequeued already, will not wait for buffers\n"); | |
1984 | return -EPIPE; | |
1985 | } | |
1986 | ||
e23ccc0a PO |
1987 | if (!list_empty(&q->done_list)) { |
1988 | /* | |
1989 | * Found a buffer that we were waiting for. | |
1990 | */ | |
1991 | break; | |
1992 | } | |
1993 | ||
1994 | if (nonblocking) { | |
3050040b | 1995 | dprintk(1, "nonblocking and no buffers to dequeue, " |
e23ccc0a PO |
1996 | "will not wait\n"); |
1997 | return -EAGAIN; | |
1998 | } | |
1999 | ||
2000 | /* | |
2001 | * We are streaming and blocking, wait for another buffer to | |
2002 | * become ready or for streamoff. Driver's lock is released to | |
2003 | * allow streamoff or qbuf to be called while waiting. | |
2004 | */ | |
a1d36d8c | 2005 | call_void_qop(q, wait_prepare, q); |
e23ccc0a PO |
2006 | |
2007 | /* | |
2008 | * All locks have been released, it is safe to sleep now. | |
2009 | */ | |
3050040b | 2010 | dprintk(3, "will sleep waiting for buffers\n"); |
e23ccc0a | 2011 | ret = wait_event_interruptible(q->done_wq, |
4bb7267d LP |
2012 | !list_empty(&q->done_list) || !q->streaming || |
2013 | q->error); | |
e23ccc0a PO |
2014 | |
2015 | /* | |
2016 | * We need to reevaluate both conditions again after reacquiring | |
2017 | * the locks or return an error if one occurred. | |
2018 | */ | |
a1d36d8c | 2019 | call_void_qop(q, wait_finish, q); |
32a77260 | 2020 | if (ret) { |
3050040b | 2021 | dprintk(1, "sleep was interrupted\n"); |
e23ccc0a | 2022 | return ret; |
32a77260 | 2023 | } |
e23ccc0a PO |
2024 | } |
2025 | return 0; | |
2026 | } | |
2027 | ||
2028 | /** | |
2029 | * __vb2_get_done_vb() - get a buffer ready for dequeuing | |
2030 | * | |
2031 | * Will sleep if required for nonblocking == false. | |
2032 | */ | |
2033 | static int __vb2_get_done_vb(struct vb2_queue *q, struct vb2_buffer **vb, | |
32a77260 | 2034 | struct v4l2_buffer *b, int nonblocking) |
e23ccc0a PO |
2035 | { |
2036 | unsigned long flags; | |
2037 | int ret; | |
2038 | ||
2039 | /* | |
2040 | * Wait for at least one buffer to become available on the done_list. | |
2041 | */ | |
2042 | ret = __vb2_wait_for_done_vb(q, nonblocking); | |
2043 | if (ret) | |
2044 | return ret; | |
2045 | ||
2046 | /* | |
2047 | * Driver's lock has been held since we last verified that done_list | |
2048 | * is not empty, so no need for another list_empty(done_list) check. | |
2049 | */ | |
2050 | spin_lock_irqsave(&q->done_lock, flags); | |
2051 | *vb = list_first_entry(&q->done_list, struct vb2_buffer, done_entry); | |
32a77260 HV |
2052 | /* |
2053 | * Only remove the buffer from done_list if v4l2_buffer can handle all | |
2054 | * the planes. | |
2055 | */ | |
2056 | ret = __verify_planes_array(*vb, b); | |
2057 | if (!ret) | |
2058 | list_del(&(*vb)->done_entry); | |
e23ccc0a PO |
2059 | spin_unlock_irqrestore(&q->done_lock, flags); |
2060 | ||
32a77260 | 2061 | return ret; |
e23ccc0a PO |
2062 | } |
2063 | ||
2064 | /** | |
2065 | * vb2_wait_for_all_buffers() - wait until all buffers are given back to vb2 | |
2066 | * @q: videobuf2 queue | |
2067 | * | |
2068 | * This function will wait until all buffers that have been given to the driver | |
2069 | * by buf_queue() are given back to vb2 with vb2_buffer_done(). It doesn't call | |
2070 | * wait_prepare, wait_finish pair. It is intended to be called with all locks | |
2071 | * taken, for example from stop_streaming() callback. | |
2072 | */ | |
2073 | int vb2_wait_for_all_buffers(struct vb2_queue *q) | |
2074 | { | |
2075 | if (!q->streaming) { | |
3050040b | 2076 | dprintk(1, "streaming off, will not wait for buffers\n"); |
e23ccc0a PO |
2077 | return -EINVAL; |
2078 | } | |
2079 | ||
b3379c62 | 2080 | if (q->start_streaming_called) |
6ea3b980 | 2081 | wait_event(q->done_wq, !atomic_read(&q->owned_by_drv_count)); |
e23ccc0a PO |
2082 | return 0; |
2083 | } | |
2084 | EXPORT_SYMBOL_GPL(vb2_wait_for_all_buffers); | |
2085 | ||
c5384048 SS |
2086 | /** |
2087 | * __vb2_dqbuf() - bring back the buffer to the DEQUEUED state | |
2088 | */ | |
2089 | static void __vb2_dqbuf(struct vb2_buffer *vb) | |
2090 | { | |
2091 | struct vb2_queue *q = vb->vb2_queue; | |
2092 | unsigned int i; | |
2093 | ||
2094 | /* nothing to do if the buffer is already dequeued */ | |
2095 | if (vb->state == VB2_BUF_STATE_DEQUEUED) | |
2096 | return; | |
2097 | ||
2098 | vb->state = VB2_BUF_STATE_DEQUEUED; | |
2099 | ||
2100 | /* unmap DMABUF buffer */ | |
2101 | if (q->memory == V4L2_MEMORY_DMABUF) | |
2102 | for (i = 0; i < vb->num_planes; ++i) { | |
2103 | if (!vb->planes[i].dbuf_mapped) | |
2104 | continue; | |
a1d36d8c | 2105 | call_void_memop(vb, unmap_dmabuf, vb->planes[i].mem_priv); |
c5384048 SS |
2106 | vb->planes[i].dbuf_mapped = 0; |
2107 | } | |
2108 | } | |
2109 | ||
b2f2f047 | 2110 | static int vb2_internal_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking) |
e23ccc0a PO |
2111 | { |
2112 | struct vb2_buffer *vb = NULL; | |
2113 | int ret; | |
2114 | ||
2115 | if (b->type != q->type) { | |
fd4354cf | 2116 | dprintk(1, "invalid buffer type\n"); |
e23ccc0a PO |
2117 | return -EINVAL; |
2118 | } | |
32a77260 HV |
2119 | ret = __vb2_get_done_vb(q, &vb, b, nonblocking); |
2120 | if (ret < 0) | |
e23ccc0a | 2121 | return ret; |
e23ccc0a | 2122 | |
e23ccc0a PO |
2123 | switch (vb->state) { |
2124 | case VB2_BUF_STATE_DONE: | |
3050040b | 2125 | dprintk(3, "returning done buffer\n"); |
e23ccc0a PO |
2126 | break; |
2127 | case VB2_BUF_STATE_ERROR: | |
3050040b | 2128 | dprintk(3, "returning done buffer with errors\n"); |
e23ccc0a PO |
2129 | break; |
2130 | default: | |
3050040b | 2131 | dprintk(1, "invalid buffer state\n"); |
e23ccc0a PO |
2132 | return -EINVAL; |
2133 | } | |
2134 | ||
a1d36d8c | 2135 | call_void_vb_qop(vb, buf_finish, vb); |
9cf3c31a | 2136 | |
e23ccc0a PO |
2137 | /* Fill buffer information for the userspace */ |
2138 | __fill_v4l2_buffer(vb, b); | |
2139 | /* Remove from videobuf queue */ | |
2140 | list_del(&vb->queued_entry); | |
b3379c62 | 2141 | q->queued_count--; |
2091f518 PZ |
2142 | |
2143 | trace_vb2_dqbuf(q, vb); | |
2144 | ||
c1621840 PZ |
2145 | if (!V4L2_TYPE_IS_OUTPUT(q->type) && |
2146 | vb->v4l2_buf.flags & V4L2_BUF_FLAG_LAST) | |
2147 | q->last_buffer_dequeued = true; | |
c5384048 SS |
2148 | /* go back to dequeued state */ |
2149 | __vb2_dqbuf(vb); | |
e23ccc0a PO |
2150 | |
2151 | dprintk(1, "dqbuf of buffer %d, with state %d\n", | |
2152 | vb->v4l2_buf.index, vb->state); | |
2153 | ||
e23ccc0a PO |
2154 | return 0; |
2155 | } | |
b2f2f047 HV |
2156 | |
2157 | /** | |
2158 | * vb2_dqbuf() - Dequeue a buffer to the userspace | |
2159 | * @q: videobuf2 queue | |
2160 | * @b: buffer structure passed from userspace to vidioc_dqbuf handler | |
2161 | * in driver | |
2162 | * @nonblocking: if true, this call will not sleep waiting for a buffer if no | |
2163 | * buffers ready for dequeuing are present. Normally the driver | |
2164 | * would be passing (file->f_flags & O_NONBLOCK) here | |
2165 | * | |
2166 | * Should be called from vidioc_dqbuf ioctl handler of a driver. | |
2167 | * This function: | |
2168 | * 1) verifies the passed buffer, | |
2169 | * 2) calls buf_finish callback in the driver (if provided), in which | |
2170 | * driver can perform any additional operations that may be required before | |
2171 | * returning the buffer to userspace, such as cache sync, | |
2172 | * 3) the buffer struct members are filled with relevant information for | |
2173 | * the userspace. | |
2174 | * | |
2175 | * The return values from this function are intended to be directly returned | |
2176 | * from vidioc_dqbuf handler in driver. | |
2177 | */ | |
2178 | int vb2_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking) | |
2179 | { | |
74753cff | 2180 | if (vb2_fileio_is_active(q)) { |
fd4354cf | 2181 | dprintk(1, "file io in progress\n"); |
b2f2f047 HV |
2182 | return -EBUSY; |
2183 | } | |
2184 | return vb2_internal_dqbuf(q, b, nonblocking); | |
2185 | } | |
e23ccc0a PO |
2186 | EXPORT_SYMBOL_GPL(vb2_dqbuf); |
2187 | ||
bd323e28 MS |
2188 | /** |
2189 | * __vb2_queue_cancel() - cancel and stop (pause) streaming | |
2190 | * | |
2191 | * Removes all queued buffers from driver's queue and all buffers queued by | |
2192 | * userspace from videobuf's queue. Returns to state after reqbufs. | |
2193 | */ | |
2194 | static void __vb2_queue_cancel(struct vb2_queue *q) | |
2195 | { | |
2196 | unsigned int i; | |
2197 | ||
2198 | /* | |
2199 | * Tell driver to stop all transactions and release all queued | |
2200 | * buffers. | |
2201 | */ | |
b3379c62 | 2202 | if (q->start_streaming_called) |
e37559b2 | 2203 | call_void_qop(q, stop_streaming, q); |
b3379c62 | 2204 | |
23cd08c8 HV |
2205 | /* |
2206 | * If you see this warning, then the driver isn't cleaning up properly | |
2207 | * in stop_streaming(). See the stop_streaming() documentation in | |
2208 | * videobuf2-core.h for more information how buffers should be returned | |
2209 | * to vb2 in stop_streaming(). | |
2210 | */ | |
b3379c62 HV |
2211 | if (WARN_ON(atomic_read(&q->owned_by_drv_count))) { |
2212 | for (i = 0; i < q->num_buffers; ++i) | |
2213 | if (q->bufs[i]->state == VB2_BUF_STATE_ACTIVE) | |
2214 | vb2_buffer_done(q->bufs[i], VB2_BUF_STATE_ERROR); | |
2215 | /* Must be zero now */ | |
2216 | WARN_ON(atomic_read(&q->owned_by_drv_count)); | |
2217 | } | |
bd323e28 | 2218 | |
b646f0b7 LP |
2219 | q->streaming = 0; |
2220 | q->start_streaming_called = 0; | |
2221 | q->queued_count = 0; | |
4bb7267d | 2222 | q->error = 0; |
b646f0b7 | 2223 | |
bd323e28 MS |
2224 | /* |
2225 | * Remove all buffers from videobuf's list... | |
2226 | */ | |
2227 | INIT_LIST_HEAD(&q->queued_list); | |
2228 | /* | |
2229 | * ...and done list; userspace will not receive any buffers it | |
2230 | * has not already dequeued before initiating cancel. | |
2231 | */ | |
2232 | INIT_LIST_HEAD(&q->done_list); | |
6ea3b980 | 2233 | atomic_set(&q->owned_by_drv_count, 0); |
bd323e28 MS |
2234 | wake_up_all(&q->done_wq); |
2235 | ||
2236 | /* | |
2237 | * Reinitialize all buffers for next use. | |
9c0863b1 HV |
2238 | * Make sure to call buf_finish for any queued buffers. Normally |
2239 | * that's done in dqbuf, but that's not going to happen when we | |
2240 | * cancel the whole queue. Note: this code belongs here, not in | |
2241 | * __vb2_dqbuf() since in vb2_internal_dqbuf() there is a critical | |
2242 | * call to __fill_v4l2_buffer() after buf_finish(). That order can't | |
2243 | * be changed, so we can't move the buf_finish() to __vb2_dqbuf(). | |
bd323e28 | 2244 | */ |
9c0863b1 HV |
2245 | for (i = 0; i < q->num_buffers; ++i) { |
2246 | struct vb2_buffer *vb = q->bufs[i]; | |
2247 | ||
2248 | if (vb->state != VB2_BUF_STATE_DEQUEUED) { | |
2249 | vb->state = VB2_BUF_STATE_PREPARED; | |
a1d36d8c | 2250 | call_void_vb_qop(vb, buf_finish, vb); |
9c0863b1 HV |
2251 | } |
2252 | __vb2_dqbuf(vb); | |
2253 | } | |
bd323e28 MS |
2254 | } |
2255 | ||
b2f2f047 | 2256 | static int vb2_internal_streamon(struct vb2_queue *q, enum v4l2_buf_type type) |
e23ccc0a | 2257 | { |
5db2c3ba | 2258 | int ret; |
e23ccc0a PO |
2259 | |
2260 | if (type != q->type) { | |
fd4354cf | 2261 | dprintk(1, "invalid stream type\n"); |
e23ccc0a PO |
2262 | return -EINVAL; |
2263 | } | |
2264 | ||
2265 | if (q->streaming) { | |
fd4354cf | 2266 | dprintk(3, "already streaming\n"); |
f956035c | 2267 | return 0; |
e23ccc0a PO |
2268 | } |
2269 | ||
548df783 | 2270 | if (!q->num_buffers) { |
fd4354cf | 2271 | dprintk(1, "no buffers have been allocated\n"); |
548df783 RR |
2272 | return -EINVAL; |
2273 | } | |
2274 | ||
b3379c62 | 2275 | if (q->num_buffers < q->min_buffers_needed) { |
fd4354cf | 2276 | dprintk(1, "need at least %u allocated buffers\n", |
b3379c62 HV |
2277 | q->min_buffers_needed); |
2278 | return -EINVAL; | |
2279 | } | |
249f5a58 | 2280 | |
e23ccc0a | 2281 | /* |
b3379c62 HV |
2282 | * Tell driver to start streaming provided sufficient buffers |
2283 | * are available. | |
e23ccc0a | 2284 | */ |
b3379c62 HV |
2285 | if (q->queued_count >= q->min_buffers_needed) { |
2286 | ret = vb2_start_streaming(q); | |
2287 | if (ret) { | |
2288 | __vb2_queue_cancel(q); | |
2289 | return ret; | |
2290 | } | |
5db2c3ba PO |
2291 | } |
2292 | ||
2293 | q->streaming = 1; | |
e23ccc0a | 2294 | |
fd4354cf | 2295 | dprintk(3, "successful\n"); |
e23ccc0a PO |
2296 | return 0; |
2297 | } | |
e23ccc0a | 2298 | |
4bb7267d LP |
2299 | /** |
2300 | * vb2_queue_error() - signal a fatal error on the queue | |
2301 | * @q: videobuf2 queue | |
2302 | * | |
2303 | * Flag that a fatal unrecoverable error has occurred and wake up all processes | |
2304 | * waiting on the queue. Polling will now set POLLERR and queuing and dequeuing | |
2305 | * buffers will return -EIO. | |
2306 | * | |
2307 | * The error flag will be cleared when cancelling the queue, either from | |
2308 | * vb2_streamoff or vb2_queue_release. Drivers should thus not call this | |
2309 | * function before starting the stream, otherwise the error flag will remain set | |
2310 | * until the queue is released when closing the device node. | |
2311 | */ | |
2312 | void vb2_queue_error(struct vb2_queue *q) | |
2313 | { | |
2314 | q->error = 1; | |
2315 | ||
2316 | wake_up_all(&q->done_wq); | |
2317 | } | |
2318 | EXPORT_SYMBOL_GPL(vb2_queue_error); | |
2319 | ||
e23ccc0a | 2320 | /** |
b2f2f047 | 2321 | * vb2_streamon - start streaming |
e23ccc0a | 2322 | * @q: videobuf2 queue |
b2f2f047 | 2323 | * @type: type argument passed from userspace to vidioc_streamon handler |
e23ccc0a | 2324 | * |
b2f2f047 | 2325 | * Should be called from vidioc_streamon handler of a driver. |
e23ccc0a | 2326 | * This function: |
b2f2f047 HV |
2327 | * 1) verifies current state |
2328 | * 2) passes any previously queued buffers to the driver and starts streaming | |
e23ccc0a | 2329 | * |
e23ccc0a | 2330 | * The return values from this function are intended to be directly returned |
b2f2f047 | 2331 | * from vidioc_streamon handler in the driver. |
e23ccc0a | 2332 | */ |
b2f2f047 | 2333 | int vb2_streamon(struct vb2_queue *q, enum v4l2_buf_type type) |
e23ccc0a | 2334 | { |
74753cff | 2335 | if (vb2_fileio_is_active(q)) { |
fd4354cf | 2336 | dprintk(1, "file io in progress\n"); |
b25748fe MS |
2337 | return -EBUSY; |
2338 | } | |
b2f2f047 HV |
2339 | return vb2_internal_streamon(q, type); |
2340 | } | |
2341 | EXPORT_SYMBOL_GPL(vb2_streamon); | |
b25748fe | 2342 | |
b2f2f047 HV |
2343 | static int vb2_internal_streamoff(struct vb2_queue *q, enum v4l2_buf_type type) |
2344 | { | |
e23ccc0a | 2345 | if (type != q->type) { |
fd4354cf | 2346 | dprintk(1, "invalid stream type\n"); |
e23ccc0a PO |
2347 | return -EINVAL; |
2348 | } | |
2349 | ||
e23ccc0a PO |
2350 | /* |
2351 | * Cancel will pause streaming and remove all buffers from the driver | |
2352 | * and videobuf, effectively returning control over them to userspace. | |
3f1a9a33 HV |
2353 | * |
2354 | * Note that we do this even if q->streaming == 0: if you prepare or | |
2355 | * queue buffers, and then call streamoff without ever having called | |
2356 | * streamon, you would still expect those buffers to be returned to | |
2357 | * their normal dequeued state. | |
e23ccc0a PO |
2358 | */ |
2359 | __vb2_queue_cancel(q); | |
58d75f4b | 2360 | q->waiting_for_buffers = !V4L2_TYPE_IS_OUTPUT(q->type); |
c1621840 | 2361 | q->last_buffer_dequeued = false; |
e23ccc0a | 2362 | |
fd4354cf | 2363 | dprintk(3, "successful\n"); |
e23ccc0a PO |
2364 | return 0; |
2365 | } | |
b2f2f047 HV |
2366 | |
2367 | /** | |
2368 | * vb2_streamoff - stop streaming | |
2369 | * @q: videobuf2 queue | |
2370 | * @type: type argument passed from userspace to vidioc_streamoff handler | |
2371 | * | |
2372 | * Should be called from vidioc_streamoff handler of a driver. | |
2373 | * This function: | |
2374 | * 1) verifies current state, | |
2375 | * 2) stop streaming and dequeues any queued buffers, including those previously | |
2376 | * passed to the driver (after waiting for the driver to finish). | |
2377 | * | |
2378 | * This call can be used for pausing playback. | |
2379 | * The return values from this function are intended to be directly returned | |
2380 | * from vidioc_streamoff handler in the driver | |
2381 | */ | |
2382 | int vb2_streamoff(struct vb2_queue *q, enum v4l2_buf_type type) | |
2383 | { | |
74753cff | 2384 | if (vb2_fileio_is_active(q)) { |
fd4354cf | 2385 | dprintk(1, "file io in progress\n"); |
b2f2f047 HV |
2386 | return -EBUSY; |
2387 | } | |
2388 | return vb2_internal_streamoff(q, type); | |
2389 | } | |
e23ccc0a PO |
2390 | EXPORT_SYMBOL_GPL(vb2_streamoff); |
2391 | ||
2392 | /** | |
2393 | * __find_plane_by_offset() - find plane associated with the given offset off | |
2394 | */ | |
2395 | static int __find_plane_by_offset(struct vb2_queue *q, unsigned long off, | |
2396 | unsigned int *_buffer, unsigned int *_plane) | |
2397 | { | |
2398 | struct vb2_buffer *vb; | |
2399 | unsigned int buffer, plane; | |
2400 | ||
2401 | /* | |
2402 | * Go over all buffers and their planes, comparing the given offset | |
2403 | * with an offset assigned to each plane. If a match is found, | |
2404 | * return its buffer and plane numbers. | |
2405 | */ | |
2406 | for (buffer = 0; buffer < q->num_buffers; ++buffer) { | |
2407 | vb = q->bufs[buffer]; | |
2408 | ||
2409 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
2410 | if (vb->v4l2_planes[plane].m.mem_offset == off) { | |
2411 | *_buffer = buffer; | |
2412 | *_plane = plane; | |
2413 | return 0; | |
2414 | } | |
2415 | } | |
2416 | } | |
2417 | ||
2418 | return -EINVAL; | |
2419 | } | |
2420 | ||
83ae7c5a TS |
2421 | /** |
2422 | * vb2_expbuf() - Export a buffer as a file descriptor | |
2423 | * @q: videobuf2 queue | |
2424 | * @eb: export buffer structure passed from userspace to vidioc_expbuf | |
2425 | * handler in driver | |
2426 | * | |
2427 | * The return values from this function are intended to be directly returned | |
2428 | * from vidioc_expbuf handler in driver. | |
2429 | */ | |
2430 | int vb2_expbuf(struct vb2_queue *q, struct v4l2_exportbuffer *eb) | |
2431 | { | |
2432 | struct vb2_buffer *vb = NULL; | |
2433 | struct vb2_plane *vb_plane; | |
2434 | int ret; | |
2435 | struct dma_buf *dbuf; | |
2436 | ||
2437 | if (q->memory != V4L2_MEMORY_MMAP) { | |
3050040b | 2438 | dprintk(1, "queue is not currently set up for mmap\n"); |
83ae7c5a TS |
2439 | return -EINVAL; |
2440 | } | |
2441 | ||
2442 | if (!q->mem_ops->get_dmabuf) { | |
3050040b | 2443 | dprintk(1, "queue does not support DMA buffer exporting\n"); |
83ae7c5a TS |
2444 | return -EINVAL; |
2445 | } | |
2446 | ||
ea3aba84 | 2447 | if (eb->flags & ~(O_CLOEXEC | O_ACCMODE)) { |
3050040b | 2448 | dprintk(1, "queue does support only O_CLOEXEC and access mode flags\n"); |
83ae7c5a TS |
2449 | return -EINVAL; |
2450 | } | |
2451 | ||
2452 | if (eb->type != q->type) { | |
fd4354cf | 2453 | dprintk(1, "invalid buffer type\n"); |
83ae7c5a TS |
2454 | return -EINVAL; |
2455 | } | |
2456 | ||
2457 | if (eb->index >= q->num_buffers) { | |
2458 | dprintk(1, "buffer index out of range\n"); | |
2459 | return -EINVAL; | |
2460 | } | |
2461 | ||
2462 | vb = q->bufs[eb->index]; | |
2463 | ||
2464 | if (eb->plane >= vb->num_planes) { | |
2465 | dprintk(1, "buffer plane out of range\n"); | |
2466 | return -EINVAL; | |
2467 | } | |
2468 | ||
74753cff HV |
2469 | if (vb2_fileio_is_active(q)) { |
2470 | dprintk(1, "expbuf: file io in progress\n"); | |
2471 | return -EBUSY; | |
2472 | } | |
2473 | ||
83ae7c5a TS |
2474 | vb_plane = &vb->planes[eb->plane]; |
2475 | ||
a1d36d8c | 2476 | dbuf = call_ptr_memop(vb, get_dmabuf, vb_plane->mem_priv, eb->flags & O_ACCMODE); |
83ae7c5a | 2477 | if (IS_ERR_OR_NULL(dbuf)) { |
3050040b | 2478 | dprintk(1, "failed to export buffer %d, plane %d\n", |
83ae7c5a TS |
2479 | eb->index, eb->plane); |
2480 | return -EINVAL; | |
2481 | } | |
2482 | ||
ea3aba84 | 2483 | ret = dma_buf_fd(dbuf, eb->flags & ~O_ACCMODE); |
83ae7c5a TS |
2484 | if (ret < 0) { |
2485 | dprintk(3, "buffer %d, plane %d failed to export (%d)\n", | |
2486 | eb->index, eb->plane, ret); | |
2487 | dma_buf_put(dbuf); | |
2488 | return ret; | |
2489 | } | |
2490 | ||
2491 | dprintk(3, "buffer %d, plane %d exported as %d descriptor\n", | |
2492 | eb->index, eb->plane, ret); | |
2493 | eb->fd = ret; | |
2494 | ||
2495 | return 0; | |
2496 | } | |
2497 | EXPORT_SYMBOL_GPL(vb2_expbuf); | |
2498 | ||
e23ccc0a PO |
2499 | /** |
2500 | * vb2_mmap() - map video buffers into application address space | |
2501 | * @q: videobuf2 queue | |
2502 | * @vma: vma passed to the mmap file operation handler in the driver | |
2503 | * | |
2504 | * Should be called from mmap file operation handler of a driver. | |
2505 | * This function maps one plane of one of the available video buffers to | |
2506 | * userspace. To map whole video memory allocated on reqbufs, this function | |
2507 | * has to be called once per each plane per each buffer previously allocated. | |
2508 | * | |
2509 | * When the userspace application calls mmap, it passes to it an offset returned | |
2510 | * to it earlier by the means of vidioc_querybuf handler. That offset acts as | |
2511 | * a "cookie", which is then used to identify the plane to be mapped. | |
2512 | * This function finds a plane with a matching offset and a mapping is performed | |
2513 | * by the means of a provided memory operation. | |
2514 | * | |
2515 | * The return values from this function are intended to be directly returned | |
2516 | * from the mmap handler in driver. | |
2517 | */ | |
2518 | int vb2_mmap(struct vb2_queue *q, struct vm_area_struct *vma) | |
2519 | { | |
2520 | unsigned long off = vma->vm_pgoff << PAGE_SHIFT; | |
e23ccc0a | 2521 | struct vb2_buffer *vb; |
ce9c2244 | 2522 | unsigned int buffer = 0, plane = 0; |
e23ccc0a | 2523 | int ret; |
7f841459 | 2524 | unsigned long length; |
e23ccc0a PO |
2525 | |
2526 | if (q->memory != V4L2_MEMORY_MMAP) { | |
3050040b | 2527 | dprintk(1, "queue is not currently set up for mmap\n"); |
e23ccc0a PO |
2528 | return -EINVAL; |
2529 | } | |
2530 | ||
2531 | /* | |
2532 | * Check memory area access mode. | |
2533 | */ | |
2534 | if (!(vma->vm_flags & VM_SHARED)) { | |
3050040b | 2535 | dprintk(1, "invalid vma flags, VM_SHARED needed\n"); |
e23ccc0a PO |
2536 | return -EINVAL; |
2537 | } | |
2538 | if (V4L2_TYPE_IS_OUTPUT(q->type)) { | |
2539 | if (!(vma->vm_flags & VM_WRITE)) { | |
3050040b | 2540 | dprintk(1, "invalid vma flags, VM_WRITE needed\n"); |
e23ccc0a PO |
2541 | return -EINVAL; |
2542 | } | |
2543 | } else { | |
2544 | if (!(vma->vm_flags & VM_READ)) { | |
3050040b | 2545 | dprintk(1, "invalid vma flags, VM_READ needed\n"); |
e23ccc0a PO |
2546 | return -EINVAL; |
2547 | } | |
2548 | } | |
74753cff HV |
2549 | if (vb2_fileio_is_active(q)) { |
2550 | dprintk(1, "mmap: file io in progress\n"); | |
2551 | return -EBUSY; | |
2552 | } | |
e23ccc0a PO |
2553 | |
2554 | /* | |
2555 | * Find the plane corresponding to the offset passed by userspace. | |
2556 | */ | |
2557 | ret = __find_plane_by_offset(q, off, &buffer, &plane); | |
2558 | if (ret) | |
2559 | return ret; | |
2560 | ||
2561 | vb = q->bufs[buffer]; | |
e23ccc0a | 2562 | |
7f841459 MCC |
2563 | /* |
2564 | * MMAP requires page_aligned buffers. | |
2565 | * The buffer length was page_aligned at __vb2_buf_mem_alloc(), | |
2566 | * so, we need to do the same here. | |
2567 | */ | |
2568 | length = PAGE_ALIGN(vb->v4l2_planes[plane].length); | |
2569 | if (length < (vma->vm_end - vma->vm_start)) { | |
2570 | dprintk(1, | |
2571 | "MMAP invalid, as it would overflow buffer length\n"); | |
068a0df7 SWK |
2572 | return -EINVAL; |
2573 | } | |
2574 | ||
f035eb4e | 2575 | mutex_lock(&q->mmap_lock); |
b5b4541e | 2576 | ret = call_memop(vb, mmap, vb->planes[plane].mem_priv, vma); |
f035eb4e | 2577 | mutex_unlock(&q->mmap_lock); |
a1d36d8c | 2578 | if (ret) |
e23ccc0a PO |
2579 | return ret; |
2580 | ||
3050040b | 2581 | dprintk(3, "buffer %d, plane %d successfully mapped\n", buffer, plane); |
e23ccc0a PO |
2582 | return 0; |
2583 | } | |
2584 | EXPORT_SYMBOL_GPL(vb2_mmap); | |
2585 | ||
6f524ec1 SJ |
2586 | #ifndef CONFIG_MMU |
2587 | unsigned long vb2_get_unmapped_area(struct vb2_queue *q, | |
2588 | unsigned long addr, | |
2589 | unsigned long len, | |
2590 | unsigned long pgoff, | |
2591 | unsigned long flags) | |
2592 | { | |
2593 | unsigned long off = pgoff << PAGE_SHIFT; | |
2594 | struct vb2_buffer *vb; | |
2595 | unsigned int buffer, plane; | |
f035eb4e | 2596 | void *vaddr; |
6f524ec1 SJ |
2597 | int ret; |
2598 | ||
2599 | if (q->memory != V4L2_MEMORY_MMAP) { | |
3050040b | 2600 | dprintk(1, "queue is not currently set up for mmap\n"); |
6f524ec1 SJ |
2601 | return -EINVAL; |
2602 | } | |
2603 | ||
2604 | /* | |
2605 | * Find the plane corresponding to the offset passed by userspace. | |
2606 | */ | |
2607 | ret = __find_plane_by_offset(q, off, &buffer, &plane); | |
2608 | if (ret) | |
2609 | return ret; | |
2610 | ||
2611 | vb = q->bufs[buffer]; | |
2612 | ||
f035eb4e HV |
2613 | vaddr = vb2_plane_vaddr(vb, plane); |
2614 | return vaddr ? (unsigned long)vaddr : -EINVAL; | |
6f524ec1 SJ |
2615 | } |
2616 | EXPORT_SYMBOL_GPL(vb2_get_unmapped_area); | |
2617 | #endif | |
2618 | ||
b25748fe MS |
2619 | static int __vb2_init_fileio(struct vb2_queue *q, int read); |
2620 | static int __vb2_cleanup_fileio(struct vb2_queue *q); | |
e23ccc0a PO |
2621 | |
2622 | /** | |
2623 | * vb2_poll() - implements poll userspace operation | |
2624 | * @q: videobuf2 queue | |
2625 | * @file: file argument passed to the poll file operation handler | |
2626 | * @wait: wait argument passed to the poll file operation handler | |
2627 | * | |
2628 | * This function implements poll file operation handler for a driver. | |
2629 | * For CAPTURE queues, if a buffer is ready to be dequeued, the userspace will | |
2630 | * be informed that the file descriptor of a video device is available for | |
2631 | * reading. | |
2632 | * For OUTPUT queues, if a buffer is ready to be dequeued, the file descriptor | |
2633 | * will be reported as available for writing. | |
2634 | * | |
95213ceb HV |
2635 | * If the driver uses struct v4l2_fh, then vb2_poll() will also check for any |
2636 | * pending events. | |
2637 | * | |
e23ccc0a PO |
2638 | * The return values from this function are intended to be directly returned |
2639 | * from poll handler in driver. | |
2640 | */ | |
2641 | unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait) | |
2642 | { | |
95213ceb | 2643 | struct video_device *vfd = video_devdata(file); |
bf5c7cbb | 2644 | unsigned long req_events = poll_requested_events(wait); |
e23ccc0a | 2645 | struct vb2_buffer *vb = NULL; |
95213ceb HV |
2646 | unsigned int res = 0; |
2647 | unsigned long flags; | |
2648 | ||
2649 | if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) { | |
2650 | struct v4l2_fh *fh = file->private_data; | |
2651 | ||
2652 | if (v4l2_event_pending(fh)) | |
2653 | res = POLLPRI; | |
2654 | else if (req_events & POLLPRI) | |
2655 | poll_wait(file, &fh->wait, wait); | |
2656 | } | |
e23ccc0a | 2657 | |
cd13823f HV |
2658 | if (!V4L2_TYPE_IS_OUTPUT(q->type) && !(req_events & (POLLIN | POLLRDNORM))) |
2659 | return res; | |
2660 | if (V4L2_TYPE_IS_OUTPUT(q->type) && !(req_events & (POLLOUT | POLLWRNORM))) | |
2661 | return res; | |
2662 | ||
b25748fe | 2663 | /* |
4ffabdb3 | 2664 | * Start file I/O emulator only if streaming API has not been used yet. |
b25748fe | 2665 | */ |
74753cff | 2666 | if (q->num_buffers == 0 && !vb2_fileio_is_active(q)) { |
bf5c7cbb HV |
2667 | if (!V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_READ) && |
2668 | (req_events & (POLLIN | POLLRDNORM))) { | |
95213ceb HV |
2669 | if (__vb2_init_fileio(q, 1)) |
2670 | return res | POLLERR; | |
b25748fe | 2671 | } |
bf5c7cbb HV |
2672 | if (V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_WRITE) && |
2673 | (req_events & (POLLOUT | POLLWRNORM))) { | |
95213ceb HV |
2674 | if (__vb2_init_fileio(q, 0)) |
2675 | return res | POLLERR; | |
b25748fe MS |
2676 | /* |
2677 | * Write to OUTPUT queue can be done immediately. | |
2678 | */ | |
95213ceb | 2679 | return res | POLLOUT | POLLWRNORM; |
b25748fe MS |
2680 | } |
2681 | } | |
2682 | ||
e23ccc0a | 2683 | /* |
58d75f4b HV |
2684 | * There is nothing to wait for if the queue isn't streaming, or if the |
2685 | * error flag is set. | |
e23ccc0a | 2686 | */ |
58d75f4b HV |
2687 | if (!vb2_is_streaming(q) || q->error) |
2688 | return res | POLLERR; | |
2689 | /* | |
2690 | * For compatibility with vb1: if QBUF hasn't been called yet, then | |
2691 | * return POLLERR as well. This only affects capture queues, output | |
2692 | * queues will always initialize waiting_for_buffers to false. | |
2693 | */ | |
2694 | if (q->waiting_for_buffers) | |
95213ceb | 2695 | return res | POLLERR; |
e23ccc0a | 2696 | |
1612f20e HV |
2697 | /* |
2698 | * For output streams you can write as long as there are fewer buffers | |
2699 | * queued than there are buffers available. | |
2700 | */ | |
2701 | if (V4L2_TYPE_IS_OUTPUT(q->type) && q->queued_count < q->num_buffers) | |
2702 | return res | POLLOUT | POLLWRNORM; | |
2703 | ||
c1621840 PZ |
2704 | if (list_empty(&q->done_list)) { |
2705 | /* | |
2706 | * If the last buffer was dequeued from a capture queue, | |
2707 | * return immediately. DQBUF will return -EPIPE. | |
2708 | */ | |
2709 | if (q->last_buffer_dequeued) | |
2710 | return res | POLLIN | POLLRDNORM; | |
2711 | ||
412cb87d | 2712 | poll_wait(file, &q->done_wq, wait); |
c1621840 | 2713 | } |
e23ccc0a PO |
2714 | |
2715 | /* | |
2716 | * Take first buffer available for dequeuing. | |
2717 | */ | |
2718 | spin_lock_irqsave(&q->done_lock, flags); | |
2719 | if (!list_empty(&q->done_list)) | |
2720 | vb = list_first_entry(&q->done_list, struct vb2_buffer, | |
2721 | done_entry); | |
2722 | spin_unlock_irqrestore(&q->done_lock, flags); | |
2723 | ||
2724 | if (vb && (vb->state == VB2_BUF_STATE_DONE | |
2725 | || vb->state == VB2_BUF_STATE_ERROR)) { | |
95213ceb HV |
2726 | return (V4L2_TYPE_IS_OUTPUT(q->type)) ? |
2727 | res | POLLOUT | POLLWRNORM : | |
2728 | res | POLLIN | POLLRDNORM; | |
e23ccc0a | 2729 | } |
95213ceb | 2730 | return res; |
e23ccc0a PO |
2731 | } |
2732 | EXPORT_SYMBOL_GPL(vb2_poll); | |
2733 | ||
2734 | /** | |
2735 | * vb2_queue_init() - initialize a videobuf2 queue | |
2736 | * @q: videobuf2 queue; this structure should be allocated in driver | |
2737 | * | |
2738 | * The vb2_queue structure should be allocated by the driver. The driver is | |
2739 | * responsible of clearing it's content and setting initial values for some | |
2740 | * required entries before calling this function. | |
2741 | * q->ops, q->mem_ops, q->type and q->io_modes are mandatory. Please refer | |
2742 | * to the struct vb2_queue description in include/media/videobuf2-core.h | |
2743 | * for more information. | |
2744 | */ | |
2745 | int vb2_queue_init(struct vb2_queue *q) | |
2746 | { | |
896f38f5 EG |
2747 | /* |
2748 | * Sanity check | |
2749 | */ | |
2750 | if (WARN_ON(!q) || | |
2751 | WARN_ON(!q->ops) || | |
2752 | WARN_ON(!q->mem_ops) || | |
2753 | WARN_ON(!q->type) || | |
2754 | WARN_ON(!q->io_modes) || | |
2755 | WARN_ON(!q->ops->queue_setup) || | |
6aa69f99 | 2756 | WARN_ON(!q->ops->buf_queue) || |
872484ce SA |
2757 | WARN_ON(q->timestamp_flags & |
2758 | ~(V4L2_BUF_FLAG_TIMESTAMP_MASK | | |
2759 | V4L2_BUF_FLAG_TSTAMP_SRC_MASK))) | |
896f38f5 | 2760 | return -EINVAL; |
e23ccc0a | 2761 | |
6aa69f99 | 2762 | /* Warn that the driver should choose an appropriate timestamp type */ |
c57ff792 SA |
2763 | WARN_ON((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == |
2764 | V4L2_BUF_FLAG_TIMESTAMP_UNKNOWN); | |
6aa69f99 | 2765 | |
e23ccc0a PO |
2766 | INIT_LIST_HEAD(&q->queued_list); |
2767 | INIT_LIST_HEAD(&q->done_list); | |
2768 | spin_lock_init(&q->done_lock); | |
f035eb4e | 2769 | mutex_init(&q->mmap_lock); |
e23ccc0a PO |
2770 | init_waitqueue_head(&q->done_wq); |
2771 | ||
2772 | if (q->buf_struct_size == 0) | |
2773 | q->buf_struct_size = sizeof(struct vb2_buffer); | |
2774 | ||
2775 | return 0; | |
2776 | } | |
2777 | EXPORT_SYMBOL_GPL(vb2_queue_init); | |
2778 | ||
2779 | /** | |
2780 | * vb2_queue_release() - stop streaming, release the queue and free memory | |
2781 | * @q: videobuf2 queue | |
2782 | * | |
2783 | * This function stops streaming and performs necessary clean ups, including | |
2784 | * freeing video buffer memory. The driver is responsible for freeing | |
2785 | * the vb2_queue structure itself. | |
2786 | */ | |
2787 | void vb2_queue_release(struct vb2_queue *q) | |
2788 | { | |
b25748fe | 2789 | __vb2_cleanup_fileio(q); |
e23ccc0a | 2790 | __vb2_queue_cancel(q); |
f035eb4e | 2791 | mutex_lock(&q->mmap_lock); |
2d86401c | 2792 | __vb2_queue_free(q, q->num_buffers); |
f035eb4e | 2793 | mutex_unlock(&q->mmap_lock); |
e23ccc0a PO |
2794 | } |
2795 | EXPORT_SYMBOL_GPL(vb2_queue_release); | |
2796 | ||
b25748fe MS |
2797 | /** |
2798 | * struct vb2_fileio_buf - buffer context used by file io emulator | |
2799 | * | |
2800 | * vb2 provides a compatibility layer and emulator of file io (read and | |
2801 | * write) calls on top of streaming API. This structure is used for | |
2802 | * tracking context related to the buffers. | |
2803 | */ | |
2804 | struct vb2_fileio_buf { | |
2805 | void *vaddr; | |
2806 | unsigned int size; | |
2807 | unsigned int pos; | |
2808 | unsigned int queued:1; | |
2809 | }; | |
2810 | ||
2811 | /** | |
2812 | * struct vb2_fileio_data - queue context used by file io emulator | |
2813 | * | |
4e5a4d8a HV |
2814 | * @cur_index: the index of the buffer currently being read from or |
2815 | * written to. If equal to q->num_buffers then a new buffer | |
2816 | * must be dequeued. | |
2817 | * @initial_index: in the read() case all buffers are queued up immediately | |
2818 | * in __vb2_init_fileio() and __vb2_perform_fileio() just cycles | |
2819 | * buffers. However, in the write() case no buffers are initially | |
2820 | * queued, instead whenever a buffer is full it is queued up by | |
2821 | * __vb2_perform_fileio(). Only once all available buffers have | |
2822 | * been queued up will __vb2_perform_fileio() start to dequeue | |
2823 | * buffers. This means that initially __vb2_perform_fileio() | |
2824 | * needs to know what buffer index to use when it is queuing up | |
2825 | * the buffers for the first time. That initial index is stored | |
2826 | * in this field. Once it is equal to q->num_buffers all | |
2827 | * available buffers have been queued and __vb2_perform_fileio() | |
2828 | * should start the normal dequeue/queue cycle. | |
2829 | * | |
b25748fe MS |
2830 | * vb2 provides a compatibility layer and emulator of file io (read and |
2831 | * write) calls on top of streaming API. For proper operation it required | |
2832 | * this structure to save the driver state between each call of the read | |
2833 | * or write function. | |
2834 | */ | |
2835 | struct vb2_fileio_data { | |
2836 | struct v4l2_requestbuffers req; | |
7bb6edd3 | 2837 | struct v4l2_plane p; |
b25748fe MS |
2838 | struct v4l2_buffer b; |
2839 | struct vb2_fileio_buf bufs[VIDEO_MAX_FRAME]; | |
4e5a4d8a HV |
2840 | unsigned int cur_index; |
2841 | unsigned int initial_index; | |
b25748fe MS |
2842 | unsigned int q_count; |
2843 | unsigned int dq_count; | |
06e7a9b6 KD |
2844 | unsigned read_once:1; |
2845 | unsigned write_immediately:1; | |
b25748fe MS |
2846 | }; |
2847 | ||
2848 | /** | |
2849 | * __vb2_init_fileio() - initialize file io emulator | |
2850 | * @q: videobuf2 queue | |
2851 | * @read: mode selector (1 means read, 0 means write) | |
2852 | */ | |
2853 | static int __vb2_init_fileio(struct vb2_queue *q, int read) | |
2854 | { | |
2855 | struct vb2_fileio_data *fileio; | |
2856 | int i, ret; | |
2857 | unsigned int count = 0; | |
2858 | ||
2859 | /* | |
2860 | * Sanity check | |
2861 | */ | |
e4d25816 HV |
2862 | if (WARN_ON((read && !(q->io_modes & VB2_READ)) || |
2863 | (!read && !(q->io_modes & VB2_WRITE)))) | |
2864 | return -EINVAL; | |
b25748fe MS |
2865 | |
2866 | /* | |
2867 | * Check if device supports mapping buffers to kernel virtual space. | |
2868 | */ | |
2869 | if (!q->mem_ops->vaddr) | |
2870 | return -EBUSY; | |
2871 | ||
2872 | /* | |
2873 | * Check if streaming api has not been already activated. | |
2874 | */ | |
2875 | if (q->streaming || q->num_buffers > 0) | |
2876 | return -EBUSY; | |
2877 | ||
2878 | /* | |
2879 | * Start with count 1, driver can increase it in queue_setup() | |
2880 | */ | |
2881 | count = 1; | |
2882 | ||
06e7a9b6 KD |
2883 | dprintk(3, "setting up file io: mode %s, count %d, read_once %d, write_immediately %d\n", |
2884 | (read) ? "read" : "write", count, q->fileio_read_once, | |
2885 | q->fileio_write_immediately); | |
b25748fe MS |
2886 | |
2887 | fileio = kzalloc(sizeof(struct vb2_fileio_data), GFP_KERNEL); | |
2888 | if (fileio == NULL) | |
2889 | return -ENOMEM; | |
2890 | ||
06e7a9b6 KD |
2891 | fileio->read_once = q->fileio_read_once; |
2892 | fileio->write_immediately = q->fileio_write_immediately; | |
b25748fe MS |
2893 | |
2894 | /* | |
2895 | * Request buffers and use MMAP type to force driver | |
2896 | * to allocate buffers by itself. | |
2897 | */ | |
2898 | fileio->req.count = count; | |
2899 | fileio->req.memory = V4L2_MEMORY_MMAP; | |
2900 | fileio->req.type = q->type; | |
74753cff HV |
2901 | q->fileio = fileio; |
2902 | ret = __reqbufs(q, &fileio->req); | |
b25748fe MS |
2903 | if (ret) |
2904 | goto err_kfree; | |
2905 | ||
2906 | /* | |
2907 | * Check if plane_count is correct | |
2908 | * (multiplane buffers are not supported). | |
2909 | */ | |
2910 | if (q->bufs[0]->num_planes != 1) { | |
b25748fe MS |
2911 | ret = -EBUSY; |
2912 | goto err_reqbufs; | |
2913 | } | |
2914 | ||
2915 | /* | |
2916 | * Get kernel address of each buffer. | |
2917 | */ | |
2918 | for (i = 0; i < q->num_buffers; i++) { | |
2919 | fileio->bufs[i].vaddr = vb2_plane_vaddr(q->bufs[i], 0); | |
5dd6946c WY |
2920 | if (fileio->bufs[i].vaddr == NULL) { |
2921 | ret = -EINVAL; | |
b25748fe | 2922 | goto err_reqbufs; |
5dd6946c | 2923 | } |
b25748fe MS |
2924 | fileio->bufs[i].size = vb2_plane_size(q->bufs[i], 0); |
2925 | } | |
2926 | ||
2927 | /* | |
2928 | * Read mode requires pre queuing of all buffers. | |
2929 | */ | |
2930 | if (read) { | |
7bb6edd3 HV |
2931 | bool is_multiplanar = V4L2_TYPE_IS_MULTIPLANAR(q->type); |
2932 | ||
b25748fe MS |
2933 | /* |
2934 | * Queue all buffers. | |
2935 | */ | |
2936 | for (i = 0; i < q->num_buffers; i++) { | |
2937 | struct v4l2_buffer *b = &fileio->b; | |
7bb6edd3 | 2938 | |
b25748fe MS |
2939 | memset(b, 0, sizeof(*b)); |
2940 | b->type = q->type; | |
7bb6edd3 HV |
2941 | if (is_multiplanar) { |
2942 | memset(&fileio->p, 0, sizeof(fileio->p)); | |
2943 | b->m.planes = &fileio->p; | |
2944 | b->length = 1; | |
2945 | } | |
b25748fe MS |
2946 | b->memory = q->memory; |
2947 | b->index = i; | |
74753cff | 2948 | ret = vb2_internal_qbuf(q, b); |
b25748fe MS |
2949 | if (ret) |
2950 | goto err_reqbufs; | |
2951 | fileio->bufs[i].queued = 1; | |
2952 | } | |
4e5a4d8a HV |
2953 | /* |
2954 | * All buffers have been queued, so mark that by setting | |
2955 | * initial_index to q->num_buffers | |
2956 | */ | |
2957 | fileio->initial_index = q->num_buffers; | |
2958 | fileio->cur_index = q->num_buffers; | |
b25748fe MS |
2959 | } |
2960 | ||
02f142ec HV |
2961 | /* |
2962 | * Start streaming. | |
2963 | */ | |
74753cff | 2964 | ret = vb2_internal_streamon(q, q->type); |
02f142ec HV |
2965 | if (ret) |
2966 | goto err_reqbufs; | |
2967 | ||
b25748fe MS |
2968 | return ret; |
2969 | ||
2970 | err_reqbufs: | |
a67e1722 | 2971 | fileio->req.count = 0; |
74753cff | 2972 | __reqbufs(q, &fileio->req); |
b25748fe MS |
2973 | |
2974 | err_kfree: | |
74753cff | 2975 | q->fileio = NULL; |
b25748fe MS |
2976 | kfree(fileio); |
2977 | return ret; | |
2978 | } | |
2979 | ||
2980 | /** | |
2981 | * __vb2_cleanup_fileio() - free resourced used by file io emulator | |
2982 | * @q: videobuf2 queue | |
2983 | */ | |
2984 | static int __vb2_cleanup_fileio(struct vb2_queue *q) | |
2985 | { | |
2986 | struct vb2_fileio_data *fileio = q->fileio; | |
2987 | ||
2988 | if (fileio) { | |
b2f2f047 | 2989 | vb2_internal_streamoff(q, q->type); |
b25748fe | 2990 | q->fileio = NULL; |
b25748fe MS |
2991 | fileio->req.count = 0; |
2992 | vb2_reqbufs(q, &fileio->req); | |
2993 | kfree(fileio); | |
2994 | dprintk(3, "file io emulator closed\n"); | |
2995 | } | |
2996 | return 0; | |
2997 | } | |
2998 | ||
2999 | /** | |
3000 | * __vb2_perform_fileio() - perform a single file io (read or write) operation | |
3001 | * @q: videobuf2 queue | |
3002 | * @data: pointed to target userspace buffer | |
3003 | * @count: number of bytes to read or write | |
3004 | * @ppos: file handle position tracking pointer | |
3005 | * @nonblock: mode selector (1 means blocking calls, 0 means nonblocking) | |
3006 | * @read: access mode selector (1 means read, 0 means write) | |
3007 | */ | |
3008 | static size_t __vb2_perform_fileio(struct vb2_queue *q, char __user *data, size_t count, | |
3009 | loff_t *ppos, int nonblock, int read) | |
3010 | { | |
3011 | struct vb2_fileio_data *fileio; | |
3012 | struct vb2_fileio_buf *buf; | |
7bb6edd3 | 3013 | bool is_multiplanar = V4L2_TYPE_IS_MULTIPLANAR(q->type); |
ebd7c505 HV |
3014 | /* |
3015 | * When using write() to write data to an output video node the vb2 core | |
3016 | * should set timestamps if V4L2_BUF_FLAG_TIMESTAMP_COPY is set. Nobody | |
3017 | * else is able to provide this information with the write() operation. | |
3018 | */ | |
3019 | bool set_timestamp = !read && | |
3020 | (q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == | |
3021 | V4L2_BUF_FLAG_TIMESTAMP_COPY; | |
b25748fe MS |
3022 | int ret, index; |
3023 | ||
fd4354cf | 3024 | dprintk(3, "mode %s, offset %ld, count %zd, %sblocking\n", |
b25748fe MS |
3025 | read ? "read" : "write", (long)*ppos, count, |
3026 | nonblock ? "non" : ""); | |
3027 | ||
3028 | if (!data) | |
3029 | return -EINVAL; | |
3030 | ||
3031 | /* | |
3032 | * Initialize emulator on first call. | |
3033 | */ | |
74753cff | 3034 | if (!vb2_fileio_is_active(q)) { |
b25748fe | 3035 | ret = __vb2_init_fileio(q, read); |
fd4354cf | 3036 | dprintk(3, "vb2_init_fileio result: %d\n", ret); |
b25748fe MS |
3037 | if (ret) |
3038 | return ret; | |
3039 | } | |
3040 | fileio = q->fileio; | |
3041 | ||
b25748fe MS |
3042 | /* |
3043 | * Check if we need to dequeue the buffer. | |
3044 | */ | |
4e5a4d8a | 3045 | index = fileio->cur_index; |
88e26870 | 3046 | if (index >= q->num_buffers) { |
b25748fe MS |
3047 | /* |
3048 | * Call vb2_dqbuf to get buffer back. | |
3049 | */ | |
3050 | memset(&fileio->b, 0, sizeof(fileio->b)); | |
3051 | fileio->b.type = q->type; | |
3052 | fileio->b.memory = q->memory; | |
7bb6edd3 HV |
3053 | if (is_multiplanar) { |
3054 | memset(&fileio->p, 0, sizeof(fileio->p)); | |
3055 | fileio->b.m.planes = &fileio->p; | |
3056 | fileio->b.length = 1; | |
3057 | } | |
b2f2f047 | 3058 | ret = vb2_internal_dqbuf(q, &fileio->b, nonblock); |
fd4354cf | 3059 | dprintk(5, "vb2_dqbuf result: %d\n", ret); |
b25748fe | 3060 | if (ret) |
b2f2f047 | 3061 | return ret; |
b25748fe MS |
3062 | fileio->dq_count += 1; |
3063 | ||
4e5a4d8a | 3064 | fileio->cur_index = index = fileio->b.index; |
88e26870 HV |
3065 | buf = &fileio->bufs[index]; |
3066 | ||
b25748fe MS |
3067 | /* |
3068 | * Get number of bytes filled by the driver | |
3069 | */ | |
88e26870 | 3070 | buf->pos = 0; |
b25748fe | 3071 | buf->queued = 0; |
88e26870 HV |
3072 | buf->size = read ? vb2_get_plane_payload(q->bufs[index], 0) |
3073 | : vb2_plane_size(q->bufs[index], 0); | |
529a53c6 HV |
3074 | /* Compensate for data_offset on read in the multiplanar case. */ |
3075 | if (is_multiplanar && read && | |
3076 | fileio->b.m.planes[0].data_offset < buf->size) { | |
3077 | buf->pos = fileio->b.m.planes[0].data_offset; | |
3078 | buf->size -= buf->pos; | |
3079 | } | |
88e26870 HV |
3080 | } else { |
3081 | buf = &fileio->bufs[index]; | |
b25748fe MS |
3082 | } |
3083 | ||
3084 | /* | |
3085 | * Limit count on last few bytes of the buffer. | |
3086 | */ | |
3087 | if (buf->pos + count > buf->size) { | |
3088 | count = buf->size - buf->pos; | |
08b99e26 | 3089 | dprintk(5, "reducing read count: %zd\n", count); |
b25748fe MS |
3090 | } |
3091 | ||
3092 | /* | |
3093 | * Transfer data to userspace. | |
3094 | */ | |
fd4354cf | 3095 | dprintk(3, "copying %zd bytes - buffer %d, offset %u\n", |
b25748fe MS |
3096 | count, index, buf->pos); |
3097 | if (read) | |
3098 | ret = copy_to_user(data, buf->vaddr + buf->pos, count); | |
3099 | else | |
3100 | ret = copy_from_user(buf->vaddr + buf->pos, data, count); | |
3101 | if (ret) { | |
fd4354cf | 3102 | dprintk(3, "error copying data\n"); |
b2f2f047 | 3103 | return -EFAULT; |
b25748fe MS |
3104 | } |
3105 | ||
3106 | /* | |
3107 | * Update counters. | |
3108 | */ | |
3109 | buf->pos += count; | |
3110 | *ppos += count; | |
3111 | ||
3112 | /* | |
3113 | * Queue next buffer if required. | |
3114 | */ | |
06e7a9b6 | 3115 | if (buf->pos == buf->size || (!read && fileio->write_immediately)) { |
b25748fe MS |
3116 | /* |
3117 | * Check if this is the last buffer to read. | |
3118 | */ | |
06e7a9b6 | 3119 | if (read && fileio->read_once && fileio->dq_count == 1) { |
fd4354cf | 3120 | dprintk(3, "read limit reached\n"); |
b25748fe MS |
3121 | return __vb2_cleanup_fileio(q); |
3122 | } | |
3123 | ||
3124 | /* | |
3125 | * Call vb2_qbuf and give buffer to the driver. | |
3126 | */ | |
3127 | memset(&fileio->b, 0, sizeof(fileio->b)); | |
3128 | fileio->b.type = q->type; | |
3129 | fileio->b.memory = q->memory; | |
3130 | fileio->b.index = index; | |
3131 | fileio->b.bytesused = buf->pos; | |
7bb6edd3 HV |
3132 | if (is_multiplanar) { |
3133 | memset(&fileio->p, 0, sizeof(fileio->p)); | |
3134 | fileio->p.bytesused = buf->pos; | |
3135 | fileio->b.m.planes = &fileio->p; | |
3136 | fileio->b.length = 1; | |
3137 | } | |
ebd7c505 HV |
3138 | if (set_timestamp) |
3139 | v4l2_get_timestamp(&fileio->b.timestamp); | |
b2f2f047 | 3140 | ret = vb2_internal_qbuf(q, &fileio->b); |
fd4354cf | 3141 | dprintk(5, "vb2_dbuf result: %d\n", ret); |
b25748fe | 3142 | if (ret) |
b2f2f047 | 3143 | return ret; |
b25748fe MS |
3144 | |
3145 | /* | |
3146 | * Buffer has been queued, update the status | |
3147 | */ | |
3148 | buf->pos = 0; | |
3149 | buf->queued = 1; | |
88e26870 | 3150 | buf->size = vb2_plane_size(q->bufs[index], 0); |
b25748fe | 3151 | fileio->q_count += 1; |
4e5a4d8a HV |
3152 | /* |
3153 | * If we are queuing up buffers for the first time, then | |
3154 | * increase initial_index by one. | |
3155 | */ | |
3156 | if (fileio->initial_index < q->num_buffers) | |
3157 | fileio->initial_index++; | |
3158 | /* | |
3159 | * The next buffer to use is either a buffer that's going to be | |
3160 | * queued for the first time (initial_index < q->num_buffers) | |
3161 | * or it is equal to q->num_buffers, meaning that the next | |
3162 | * time we need to dequeue a buffer since we've now queued up | |
3163 | * all the 'first time' buffers. | |
3164 | */ | |
3165 | fileio->cur_index = fileio->initial_index; | |
b25748fe MS |
3166 | } |
3167 | ||
3168 | /* | |
3169 | * Return proper number of bytes processed. | |
3170 | */ | |
3171 | if (ret == 0) | |
3172 | ret = count; | |
b25748fe MS |
3173 | return ret; |
3174 | } | |
3175 | ||
3176 | size_t vb2_read(struct vb2_queue *q, char __user *data, size_t count, | |
3177 | loff_t *ppos, int nonblocking) | |
3178 | { | |
3179 | return __vb2_perform_fileio(q, data, count, ppos, nonblocking, 1); | |
3180 | } | |
3181 | EXPORT_SYMBOL_GPL(vb2_read); | |
3182 | ||
819585bc | 3183 | size_t vb2_write(struct vb2_queue *q, const char __user *data, size_t count, |
b25748fe MS |
3184 | loff_t *ppos, int nonblocking) |
3185 | { | |
819585bc RR |
3186 | return __vb2_perform_fileio(q, (char __user *) data, count, |
3187 | ppos, nonblocking, 0); | |
b25748fe MS |
3188 | } |
3189 | EXPORT_SYMBOL_GPL(vb2_write); | |
3190 | ||
3415a89f HV |
3191 | struct vb2_threadio_data { |
3192 | struct task_struct *thread; | |
3193 | vb2_thread_fnc fnc; | |
3194 | void *priv; | |
3195 | bool stop; | |
3196 | }; | |
3197 | ||
3198 | static int vb2_thread(void *data) | |
3199 | { | |
3200 | struct vb2_queue *q = data; | |
3201 | struct vb2_threadio_data *threadio = q->threadio; | |
3202 | struct vb2_fileio_data *fileio = q->fileio; | |
3203 | bool set_timestamp = false; | |
3204 | int prequeue = 0; | |
3205 | int index = 0; | |
3206 | int ret = 0; | |
3207 | ||
3208 | if (V4L2_TYPE_IS_OUTPUT(q->type)) { | |
3209 | prequeue = q->num_buffers; | |
3210 | set_timestamp = | |
3211 | (q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == | |
3212 | V4L2_BUF_FLAG_TIMESTAMP_COPY; | |
3213 | } | |
3214 | ||
3215 | set_freezable(); | |
3216 | ||
3217 | for (;;) { | |
3218 | struct vb2_buffer *vb; | |
3219 | ||
3220 | /* | |
3221 | * Call vb2_dqbuf to get buffer back. | |
3222 | */ | |
3223 | memset(&fileio->b, 0, sizeof(fileio->b)); | |
3224 | fileio->b.type = q->type; | |
3225 | fileio->b.memory = q->memory; | |
3226 | if (prequeue) { | |
3227 | fileio->b.index = index++; | |
3228 | prequeue--; | |
3229 | } else { | |
3230 | call_void_qop(q, wait_finish, q); | |
6cf11ee6 HV |
3231 | if (!threadio->stop) |
3232 | ret = vb2_internal_dqbuf(q, &fileio->b, 0); | |
3415a89f HV |
3233 | call_void_qop(q, wait_prepare, q); |
3234 | dprintk(5, "file io: vb2_dqbuf result: %d\n", ret); | |
3235 | } | |
6cf11ee6 | 3236 | if (ret || threadio->stop) |
3415a89f HV |
3237 | break; |
3238 | try_to_freeze(); | |
3239 | ||
3240 | vb = q->bufs[fileio->b.index]; | |
3241 | if (!(fileio->b.flags & V4L2_BUF_FLAG_ERROR)) | |
6cf11ee6 HV |
3242 | if (threadio->fnc(vb, threadio->priv)) |
3243 | break; | |
3415a89f HV |
3244 | call_void_qop(q, wait_finish, q); |
3245 | if (set_timestamp) | |
3246 | v4l2_get_timestamp(&fileio->b.timestamp); | |
6cf11ee6 HV |
3247 | if (!threadio->stop) |
3248 | ret = vb2_internal_qbuf(q, &fileio->b); | |
3415a89f | 3249 | call_void_qop(q, wait_prepare, q); |
6cf11ee6 | 3250 | if (ret || threadio->stop) |
3415a89f HV |
3251 | break; |
3252 | } | |
3253 | ||
3254 | /* Hmm, linux becomes *very* unhappy without this ... */ | |
3255 | while (!kthread_should_stop()) { | |
3256 | set_current_state(TASK_INTERRUPTIBLE); | |
3257 | schedule(); | |
3258 | } | |
3259 | return 0; | |
3260 | } | |
3261 | ||
3262 | /* | |
3263 | * This function should not be used for anything else but the videobuf2-dvb | |
3264 | * support. If you think you have another good use-case for this, then please | |
3265 | * contact the linux-media mailinglist first. | |
3266 | */ | |
3267 | int vb2_thread_start(struct vb2_queue *q, vb2_thread_fnc fnc, void *priv, | |
3268 | const char *thread_name) | |
3269 | { | |
3270 | struct vb2_threadio_data *threadio; | |
3271 | int ret = 0; | |
3272 | ||
3273 | if (q->threadio) | |
3274 | return -EBUSY; | |
3275 | if (vb2_is_busy(q)) | |
3276 | return -EBUSY; | |
3277 | if (WARN_ON(q->fileio)) | |
3278 | return -EBUSY; | |
3279 | ||
3280 | threadio = kzalloc(sizeof(*threadio), GFP_KERNEL); | |
3281 | if (threadio == NULL) | |
3282 | return -ENOMEM; | |
3283 | threadio->fnc = fnc; | |
3284 | threadio->priv = priv; | |
3285 | ||
3286 | ret = __vb2_init_fileio(q, !V4L2_TYPE_IS_OUTPUT(q->type)); | |
3287 | dprintk(3, "file io: vb2_init_fileio result: %d\n", ret); | |
3288 | if (ret) | |
3289 | goto nomem; | |
3290 | q->threadio = threadio; | |
3291 | threadio->thread = kthread_run(vb2_thread, q, "vb2-%s", thread_name); | |
3292 | if (IS_ERR(threadio->thread)) { | |
3293 | ret = PTR_ERR(threadio->thread); | |
3294 | threadio->thread = NULL; | |
3295 | goto nothread; | |
3296 | } | |
3297 | return 0; | |
3298 | ||
3299 | nothread: | |
3300 | __vb2_cleanup_fileio(q); | |
3301 | nomem: | |
3302 | kfree(threadio); | |
3303 | return ret; | |
3304 | } | |
3305 | EXPORT_SYMBOL_GPL(vb2_thread_start); | |
3306 | ||
3307 | int vb2_thread_stop(struct vb2_queue *q) | |
3308 | { | |
3309 | struct vb2_threadio_data *threadio = q->threadio; | |
3415a89f HV |
3310 | int err; |
3311 | ||
3312 | if (threadio == NULL) | |
3313 | return 0; | |
3415a89f | 3314 | threadio->stop = true; |
0e661006 HV |
3315 | /* Wake up all pending sleeps in the thread */ |
3316 | vb2_queue_error(q); | |
6cf11ee6 | 3317 | err = kthread_stop(threadio->thread); |
0e661006 | 3318 | __vb2_cleanup_fileio(q); |
3415a89f HV |
3319 | threadio->thread = NULL; |
3320 | kfree(threadio); | |
3415a89f HV |
3321 | q->threadio = NULL; |
3322 | return err; | |
3323 | } | |
3324 | EXPORT_SYMBOL_GPL(vb2_thread_stop); | |
4c1ffcaa HV |
3325 | |
3326 | /* | |
3327 | * The following functions are not part of the vb2 core API, but are helper | |
3328 | * functions that plug into struct v4l2_ioctl_ops, struct v4l2_file_operations | |
3329 | * and struct vb2_ops. | |
3330 | * They contain boilerplate code that most if not all drivers have to do | |
3331 | * and so they simplify the driver code. | |
3332 | */ | |
3333 | ||
3334 | /* The queue is busy if there is a owner and you are not that owner. */ | |
3335 | static inline bool vb2_queue_is_busy(struct video_device *vdev, struct file *file) | |
3336 | { | |
3337 | return vdev->queue->owner && vdev->queue->owner != file->private_data; | |
3338 | } | |
3339 | ||
3340 | /* vb2 ioctl helpers */ | |
3341 | ||
3342 | int vb2_ioctl_reqbufs(struct file *file, void *priv, | |
3343 | struct v4l2_requestbuffers *p) | |
3344 | { | |
3345 | struct video_device *vdev = video_devdata(file); | |
3346 | int res = __verify_memory_type(vdev->queue, p->memory, p->type); | |
3347 | ||
3348 | if (res) | |
3349 | return res; | |
3350 | if (vb2_queue_is_busy(vdev, file)) | |
3351 | return -EBUSY; | |
3352 | res = __reqbufs(vdev->queue, p); | |
3353 | /* If count == 0, then the owner has released all buffers and he | |
3354 | is no longer owner of the queue. Otherwise we have a new owner. */ | |
3355 | if (res == 0) | |
3356 | vdev->queue->owner = p->count ? file->private_data : NULL; | |
3357 | return res; | |
3358 | } | |
3359 | EXPORT_SYMBOL_GPL(vb2_ioctl_reqbufs); | |
3360 | ||
3361 | int vb2_ioctl_create_bufs(struct file *file, void *priv, | |
3362 | struct v4l2_create_buffers *p) | |
3363 | { | |
3364 | struct video_device *vdev = video_devdata(file); | |
3365 | int res = __verify_memory_type(vdev->queue, p->memory, p->format.type); | |
3366 | ||
3367 | p->index = vdev->queue->num_buffers; | |
3368 | /* If count == 0, then just check if memory and type are valid. | |
3369 | Any -EBUSY result from __verify_memory_type can be mapped to 0. */ | |
3370 | if (p->count == 0) | |
3371 | return res != -EBUSY ? res : 0; | |
3372 | if (res) | |
3373 | return res; | |
3374 | if (vb2_queue_is_busy(vdev, file)) | |
3375 | return -EBUSY; | |
3376 | res = __create_bufs(vdev->queue, p); | |
3377 | if (res == 0) | |
3378 | vdev->queue->owner = file->private_data; | |
3379 | return res; | |
3380 | } | |
3381 | EXPORT_SYMBOL_GPL(vb2_ioctl_create_bufs); | |
3382 | ||
3383 | int vb2_ioctl_prepare_buf(struct file *file, void *priv, | |
3384 | struct v4l2_buffer *p) | |
3385 | { | |
3386 | struct video_device *vdev = video_devdata(file); | |
3387 | ||
3388 | if (vb2_queue_is_busy(vdev, file)) | |
3389 | return -EBUSY; | |
3390 | return vb2_prepare_buf(vdev->queue, p); | |
3391 | } | |
3392 | EXPORT_SYMBOL_GPL(vb2_ioctl_prepare_buf); | |
3393 | ||
3394 | int vb2_ioctl_querybuf(struct file *file, void *priv, struct v4l2_buffer *p) | |
3395 | { | |
3396 | struct video_device *vdev = video_devdata(file); | |
3397 | ||
3398 | /* No need to call vb2_queue_is_busy(), anyone can query buffers. */ | |
3399 | return vb2_querybuf(vdev->queue, p); | |
3400 | } | |
3401 | EXPORT_SYMBOL_GPL(vb2_ioctl_querybuf); | |
3402 | ||
3403 | int vb2_ioctl_qbuf(struct file *file, void *priv, struct v4l2_buffer *p) | |
3404 | { | |
3405 | struct video_device *vdev = video_devdata(file); | |
3406 | ||
3407 | if (vb2_queue_is_busy(vdev, file)) | |
3408 | return -EBUSY; | |
3409 | return vb2_qbuf(vdev->queue, p); | |
3410 | } | |
3411 | EXPORT_SYMBOL_GPL(vb2_ioctl_qbuf); | |
3412 | ||
3413 | int vb2_ioctl_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p) | |
3414 | { | |
3415 | struct video_device *vdev = video_devdata(file); | |
3416 | ||
3417 | if (vb2_queue_is_busy(vdev, file)) | |
3418 | return -EBUSY; | |
3419 | return vb2_dqbuf(vdev->queue, p, file->f_flags & O_NONBLOCK); | |
3420 | } | |
3421 | EXPORT_SYMBOL_GPL(vb2_ioctl_dqbuf); | |
3422 | ||
3423 | int vb2_ioctl_streamon(struct file *file, void *priv, enum v4l2_buf_type i) | |
3424 | { | |
3425 | struct video_device *vdev = video_devdata(file); | |
3426 | ||
3427 | if (vb2_queue_is_busy(vdev, file)) | |
3428 | return -EBUSY; | |
3429 | return vb2_streamon(vdev->queue, i); | |
3430 | } | |
3431 | EXPORT_SYMBOL_GPL(vb2_ioctl_streamon); | |
3432 | ||
3433 | int vb2_ioctl_streamoff(struct file *file, void *priv, enum v4l2_buf_type i) | |
3434 | { | |
3435 | struct video_device *vdev = video_devdata(file); | |
3436 | ||
3437 | if (vb2_queue_is_busy(vdev, file)) | |
3438 | return -EBUSY; | |
3439 | return vb2_streamoff(vdev->queue, i); | |
3440 | } | |
3441 | EXPORT_SYMBOL_GPL(vb2_ioctl_streamoff); | |
3442 | ||
83ae7c5a TS |
3443 | int vb2_ioctl_expbuf(struct file *file, void *priv, struct v4l2_exportbuffer *p) |
3444 | { | |
3445 | struct video_device *vdev = video_devdata(file); | |
3446 | ||
3447 | if (vb2_queue_is_busy(vdev, file)) | |
3448 | return -EBUSY; | |
3449 | return vb2_expbuf(vdev->queue, p); | |
3450 | } | |
3451 | EXPORT_SYMBOL_GPL(vb2_ioctl_expbuf); | |
3452 | ||
4c1ffcaa HV |
3453 | /* v4l2_file_operations helpers */ |
3454 | ||
3455 | int vb2_fop_mmap(struct file *file, struct vm_area_struct *vma) | |
3456 | { | |
3457 | struct video_device *vdev = video_devdata(file); | |
3458 | ||
f035eb4e | 3459 | return vb2_mmap(vdev->queue, vma); |
4c1ffcaa HV |
3460 | } |
3461 | EXPORT_SYMBOL_GPL(vb2_fop_mmap); | |
3462 | ||
1380f575 | 3463 | int _vb2_fop_release(struct file *file, struct mutex *lock) |
4c1ffcaa HV |
3464 | { |
3465 | struct video_device *vdev = video_devdata(file); | |
3466 | ||
69c0e9c5 LP |
3467 | if (lock) |
3468 | mutex_lock(lock); | |
4c1ffcaa HV |
3469 | if (file->private_data == vdev->queue->owner) { |
3470 | vb2_queue_release(vdev->queue); | |
3471 | vdev->queue->owner = NULL; | |
3472 | } | |
69c0e9c5 LP |
3473 | if (lock) |
3474 | mutex_unlock(lock); | |
4c1ffcaa HV |
3475 | return v4l2_fh_release(file); |
3476 | } | |
1380f575 RR |
3477 | EXPORT_SYMBOL_GPL(_vb2_fop_release); |
3478 | ||
3479 | int vb2_fop_release(struct file *file) | |
3480 | { | |
3481 | struct video_device *vdev = video_devdata(file); | |
3482 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; | |
3483 | ||
3484 | return _vb2_fop_release(file, lock); | |
3485 | } | |
4c1ffcaa HV |
3486 | EXPORT_SYMBOL_GPL(vb2_fop_release); |
3487 | ||
819585bc | 3488 | ssize_t vb2_fop_write(struct file *file, const char __user *buf, |
4c1ffcaa HV |
3489 | size_t count, loff_t *ppos) |
3490 | { | |
3491 | struct video_device *vdev = video_devdata(file); | |
3492 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; | |
4c1ffcaa HV |
3493 | int err = -EBUSY; |
3494 | ||
ff05cb4b HV |
3495 | if (!(vdev->queue->io_modes & VB2_WRITE)) |
3496 | return -EINVAL; | |
cf533735 | 3497 | if (lock && mutex_lock_interruptible(lock)) |
4c1ffcaa HV |
3498 | return -ERESTARTSYS; |
3499 | if (vb2_queue_is_busy(vdev, file)) | |
3500 | goto exit; | |
3501 | err = vb2_write(vdev->queue, buf, count, ppos, | |
3502 | file->f_flags & O_NONBLOCK); | |
8c82c75c | 3503 | if (vdev->queue->fileio) |
4c1ffcaa HV |
3504 | vdev->queue->owner = file->private_data; |
3505 | exit: | |
cf533735 | 3506 | if (lock) |
4c1ffcaa HV |
3507 | mutex_unlock(lock); |
3508 | return err; | |
3509 | } | |
3510 | EXPORT_SYMBOL_GPL(vb2_fop_write); | |
3511 | ||
3512 | ssize_t vb2_fop_read(struct file *file, char __user *buf, | |
3513 | size_t count, loff_t *ppos) | |
3514 | { | |
3515 | struct video_device *vdev = video_devdata(file); | |
3516 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; | |
4c1ffcaa HV |
3517 | int err = -EBUSY; |
3518 | ||
ff05cb4b HV |
3519 | if (!(vdev->queue->io_modes & VB2_READ)) |
3520 | return -EINVAL; | |
cf533735 | 3521 | if (lock && mutex_lock_interruptible(lock)) |
4c1ffcaa HV |
3522 | return -ERESTARTSYS; |
3523 | if (vb2_queue_is_busy(vdev, file)) | |
3524 | goto exit; | |
3525 | err = vb2_read(vdev->queue, buf, count, ppos, | |
3526 | file->f_flags & O_NONBLOCK); | |
8c82c75c | 3527 | if (vdev->queue->fileio) |
4c1ffcaa HV |
3528 | vdev->queue->owner = file->private_data; |
3529 | exit: | |
cf533735 | 3530 | if (lock) |
4c1ffcaa HV |
3531 | mutex_unlock(lock); |
3532 | return err; | |
3533 | } | |
3534 | EXPORT_SYMBOL_GPL(vb2_fop_read); | |
3535 | ||
3536 | unsigned int vb2_fop_poll(struct file *file, poll_table *wait) | |
3537 | { | |
3538 | struct video_device *vdev = video_devdata(file); | |
3539 | struct vb2_queue *q = vdev->queue; | |
3540 | struct mutex *lock = q->lock ? q->lock : vdev->lock; | |
4c1ffcaa HV |
3541 | unsigned res; |
3542 | void *fileio; | |
4c1ffcaa | 3543 | |
f6cee188 LP |
3544 | /* |
3545 | * If this helper doesn't know how to lock, then you shouldn't be using | |
3546 | * it but you should write your own. | |
3547 | */ | |
3548 | WARN_ON(!lock); | |
4c1ffcaa | 3549 | |
f6cee188 | 3550 | if (lock && mutex_lock_interruptible(lock)) |
4c1ffcaa HV |
3551 | return POLLERR; |
3552 | ||
3553 | fileio = q->fileio; | |
3554 | ||
3555 | res = vb2_poll(vdev->queue, file, wait); | |
3556 | ||
3557 | /* If fileio was started, then we have a new queue owner. */ | |
f6cee188 | 3558 | if (!fileio && q->fileio) |
4c1ffcaa | 3559 | q->owner = file->private_data; |
f6cee188 | 3560 | if (lock) |
4c1ffcaa HV |
3561 | mutex_unlock(lock); |
3562 | return res; | |
3563 | } | |
3564 | EXPORT_SYMBOL_GPL(vb2_fop_poll); | |
3565 | ||
3566 | #ifndef CONFIG_MMU | |
3567 | unsigned long vb2_fop_get_unmapped_area(struct file *file, unsigned long addr, | |
3568 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
3569 | { | |
3570 | struct video_device *vdev = video_devdata(file); | |
3571 | ||
f035eb4e | 3572 | return vb2_get_unmapped_area(vdev->queue, addr, len, pgoff, flags); |
4c1ffcaa HV |
3573 | } |
3574 | EXPORT_SYMBOL_GPL(vb2_fop_get_unmapped_area); | |
3575 | #endif | |
3576 | ||
3577 | /* vb2_ops helpers. Only use if vq->lock is non-NULL. */ | |
3578 | ||
3579 | void vb2_ops_wait_prepare(struct vb2_queue *vq) | |
3580 | { | |
3581 | mutex_unlock(vq->lock); | |
3582 | } | |
3583 | EXPORT_SYMBOL_GPL(vb2_ops_wait_prepare); | |
3584 | ||
3585 | void vb2_ops_wait_finish(struct vb2_queue *vq) | |
3586 | { | |
3587 | mutex_lock(vq->lock); | |
3588 | } | |
3589 | EXPORT_SYMBOL_GPL(vb2_ops_wait_finish); | |
3590 | ||
e23ccc0a | 3591 | MODULE_DESCRIPTION("Driver helper framework for Video for Linux 2"); |
95072084 | 3592 | MODULE_AUTHOR("Pawel Osciak <pawel@osciak.com>, Marek Szyprowski"); |
e23ccc0a | 3593 | MODULE_LICENSE("GPL"); |