Commit | Line | Data |
---|---|---|
e23ccc0a PO |
1 | /* |
2 | * videobuf2-core.c - V4L2 driver helper framework | |
3 | * | |
4 | * Copyright (C) 2010 Samsung Electronics | |
5 | * | |
95072084 | 6 | * Author: Pawel Osciak <pawel@osciak.com> |
e23ccc0a PO |
7 | * Marek Szyprowski <m.szyprowski@samsung.com> |
8 | * | |
3415a89f HV |
9 | * The vb2_thread implementation was based on code from videobuf-dvb.c: |
10 | * (c) 2004 Gerd Knorr <kraxel@bytesex.org> [SUSE Labs] | |
11 | * | |
e23ccc0a PO |
12 | * This program is free software; you can redistribute it and/or modify |
13 | * it under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation. | |
15 | */ | |
16 | ||
17 | #include <linux/err.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/mm.h> | |
21 | #include <linux/poll.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/sched.h> | |
3415a89f HV |
24 | #include <linux/freezer.h> |
25 | #include <linux/kthread.h> | |
e23ccc0a | 26 | |
95213ceb HV |
27 | #include <media/v4l2-dev.h> |
28 | #include <media/v4l2-fh.h> | |
29 | #include <media/v4l2-event.h> | |
ebd7c505 | 30 | #include <media/v4l2-common.h> |
e23ccc0a PO |
31 | #include <media/videobuf2-core.h> |
32 | ||
33 | static int debug; | |
34 | module_param(debug, int, 0644); | |
35 | ||
fd4354cf HV |
36 | #define dprintk(level, fmt, arg...) \ |
37 | do { \ | |
38 | if (debug >= level) \ | |
39 | pr_debug("vb2: %s: " fmt, __func__, ## arg); \ | |
e23ccc0a PO |
40 | } while (0) |
41 | ||
b5b4541e HV |
42 | #ifdef CONFIG_VIDEO_ADV_DEBUG |
43 | ||
44 | /* | |
a1d36d8c HV |
45 | * If advanced debugging is on, then count how often each op is called |
46 | * successfully, which can either be per-buffer or per-queue. | |
b5b4541e | 47 | * |
a1d36d8c | 48 | * This makes it easy to check that the 'init' and 'cleanup' |
b5b4541e HV |
49 | * (and variations thereof) stay balanced. |
50 | */ | |
51 | ||
a1d36d8c HV |
52 | #define log_memop(vb, op) \ |
53 | dprintk(2, "call_memop(%p, %d, %s)%s\n", \ | |
54 | (vb)->vb2_queue, (vb)->v4l2_buf.index, #op, \ | |
55 | (vb)->vb2_queue->mem_ops->op ? "" : " (nop)") | |
56 | ||
b5b4541e HV |
57 | #define call_memop(vb, op, args...) \ |
58 | ({ \ | |
59 | struct vb2_queue *_q = (vb)->vb2_queue; \ | |
a1d36d8c HV |
60 | int err; \ |
61 | \ | |
62 | log_memop(vb, op); \ | |
63 | err = _q->mem_ops->op ? _q->mem_ops->op(args) : 0; \ | |
64 | if (!err) \ | |
65 | (vb)->cnt_mem_ ## op++; \ | |
66 | err; \ | |
67 | }) | |
68 | ||
69 | #define call_ptr_memop(vb, op, args...) \ | |
70 | ({ \ | |
71 | struct vb2_queue *_q = (vb)->vb2_queue; \ | |
72 | void *ptr; \ | |
73 | \ | |
74 | log_memop(vb, op); \ | |
75 | ptr = _q->mem_ops->op ? _q->mem_ops->op(args) : NULL; \ | |
76 | if (!IS_ERR_OR_NULL(ptr)) \ | |
77 | (vb)->cnt_mem_ ## op++; \ | |
78 | ptr; \ | |
79 | }) | |
80 | ||
81 | #define call_void_memop(vb, op, args...) \ | |
82 | ({ \ | |
83 | struct vb2_queue *_q = (vb)->vb2_queue; \ | |
84 | \ | |
85 | log_memop(vb, op); \ | |
86 | if (_q->mem_ops->op) \ | |
87 | _q->mem_ops->op(args); \ | |
b5b4541e | 88 | (vb)->cnt_mem_ ## op++; \ |
b5b4541e | 89 | }) |
a1d36d8c HV |
90 | |
91 | #define log_qop(q, op) \ | |
92 | dprintk(2, "call_qop(%p, %s)%s\n", q, #op, \ | |
93 | (q)->ops->op ? "" : " (nop)") | |
b5b4541e HV |
94 | |
95 | #define call_qop(q, op, args...) \ | |
96 | ({ \ | |
a1d36d8c HV |
97 | int err; \ |
98 | \ | |
99 | log_qop(q, op); \ | |
100 | err = (q)->ops->op ? (q)->ops->op(args) : 0; \ | |
101 | if (!err) \ | |
102 | (q)->cnt_ ## op++; \ | |
103 | err; \ | |
104 | }) | |
105 | ||
106 | #define call_void_qop(q, op, args...) \ | |
107 | ({ \ | |
108 | log_qop(q, op); \ | |
109 | if ((q)->ops->op) \ | |
110 | (q)->ops->op(args); \ | |
b5b4541e | 111 | (q)->cnt_ ## op++; \ |
b5b4541e | 112 | }) |
a1d36d8c HV |
113 | |
114 | #define log_vb_qop(vb, op, args...) \ | |
115 | dprintk(2, "call_vb_qop(%p, %d, %s)%s\n", \ | |
116 | (vb)->vb2_queue, (vb)->v4l2_buf.index, #op, \ | |
117 | (vb)->vb2_queue->ops->op ? "" : " (nop)") | |
b5b4541e HV |
118 | |
119 | #define call_vb_qop(vb, op, args...) \ | |
120 | ({ \ | |
a1d36d8c HV |
121 | int err; \ |
122 | \ | |
123 | log_vb_qop(vb, op); \ | |
124 | err = (vb)->vb2_queue->ops->op ? \ | |
125 | (vb)->vb2_queue->ops->op(args) : 0; \ | |
126 | if (!err) \ | |
127 | (vb)->cnt_ ## op++; \ | |
128 | err; \ | |
129 | }) | |
130 | ||
131 | #define call_void_vb_qop(vb, op, args...) \ | |
132 | ({ \ | |
133 | log_vb_qop(vb, op); \ | |
134 | if ((vb)->vb2_queue->ops->op) \ | |
135 | (vb)->vb2_queue->ops->op(args); \ | |
b5b4541e | 136 | (vb)->cnt_ ## op++; \ |
b5b4541e | 137 | }) |
b5b4541e HV |
138 | |
139 | #else | |
140 | ||
141 | #define call_memop(vb, op, args...) \ | |
a1d36d8c HV |
142 | ((vb)->vb2_queue->mem_ops->op ? \ |
143 | (vb)->vb2_queue->mem_ops->op(args) : 0) | |
144 | ||
145 | #define call_ptr_memop(vb, op, args...) \ | |
146 | ((vb)->vb2_queue->mem_ops->op ? \ | |
147 | (vb)->vb2_queue->mem_ops->op(args) : NULL) | |
148 | ||
149 | #define call_void_memop(vb, op, args...) \ | |
150 | do { \ | |
151 | if ((vb)->vb2_queue->mem_ops->op) \ | |
152 | (vb)->vb2_queue->mem_ops->op(args); \ | |
153 | } while (0) | |
e23ccc0a PO |
154 | |
155 | #define call_qop(q, op, args...) \ | |
b5b4541e | 156 | ((q)->ops->op ? (q)->ops->op(args) : 0) |
a1d36d8c HV |
157 | |
158 | #define call_void_qop(q, op, args...) \ | |
159 | do { \ | |
160 | if ((q)->ops->op) \ | |
161 | (q)->ops->op(args); \ | |
162 | } while (0) | |
b5b4541e HV |
163 | |
164 | #define call_vb_qop(vb, op, args...) \ | |
165 | ((vb)->vb2_queue->ops->op ? (vb)->vb2_queue->ops->op(args) : 0) | |
a1d36d8c HV |
166 | |
167 | #define call_void_vb_qop(vb, op, args...) \ | |
168 | do { \ | |
169 | if ((vb)->vb2_queue->ops->op) \ | |
170 | (vb)->vb2_queue->ops->op(args); \ | |
171 | } while (0) | |
b5b4541e HV |
172 | |
173 | #endif | |
e23ccc0a | 174 | |
f1343281 | 175 | /* Flags that are set by the vb2 core */ |
1b18e7a0 | 176 | #define V4L2_BUFFER_MASK_FLAGS (V4L2_BUF_FLAG_MAPPED | V4L2_BUF_FLAG_QUEUED | \ |
2d86401c | 177 | V4L2_BUF_FLAG_DONE | V4L2_BUF_FLAG_ERROR | \ |
1b18e7a0 SA |
178 | V4L2_BUF_FLAG_PREPARED | \ |
179 | V4L2_BUF_FLAG_TIMESTAMP_MASK) | |
f1343281 HV |
180 | /* Output buffer flags that should be passed on to the driver */ |
181 | #define V4L2_BUFFER_OUT_FLAGS (V4L2_BUF_FLAG_PFRAME | V4L2_BUF_FLAG_BFRAME | \ | |
182 | V4L2_BUF_FLAG_KEYFRAME | V4L2_BUF_FLAG_TIMECODE) | |
ea42c8ec | 183 | |
fb64dca8 HV |
184 | static void __vb2_queue_cancel(struct vb2_queue *q); |
185 | ||
e23ccc0a PO |
186 | /** |
187 | * __vb2_buf_mem_alloc() - allocate video memory for the given buffer | |
188 | */ | |
c1426bc7 | 189 | static int __vb2_buf_mem_alloc(struct vb2_buffer *vb) |
e23ccc0a PO |
190 | { |
191 | struct vb2_queue *q = vb->vb2_queue; | |
192 | void *mem_priv; | |
193 | int plane; | |
194 | ||
7f841459 MCC |
195 | /* |
196 | * Allocate memory for all planes in this buffer | |
197 | * NOTE: mmapped areas should be page aligned | |
198 | */ | |
e23ccc0a | 199 | for (plane = 0; plane < vb->num_planes; ++plane) { |
7f841459 MCC |
200 | unsigned long size = PAGE_ALIGN(q->plane_sizes[plane]); |
201 | ||
a1d36d8c | 202 | mem_priv = call_ptr_memop(vb, alloc, q->alloc_ctx[plane], |
7f841459 | 203 | size, q->gfp_flags); |
62a79436 | 204 | if (IS_ERR_OR_NULL(mem_priv)) |
e23ccc0a PO |
205 | goto free; |
206 | ||
207 | /* Associate allocator private data with this plane */ | |
208 | vb->planes[plane].mem_priv = mem_priv; | |
c1426bc7 | 209 | vb->v4l2_planes[plane].length = q->plane_sizes[plane]; |
e23ccc0a PO |
210 | } |
211 | ||
212 | return 0; | |
213 | free: | |
214 | /* Free already allocated memory if one of the allocations failed */ | |
a00d0266 | 215 | for (; plane > 0; --plane) { |
a1d36d8c | 216 | call_void_memop(vb, put, vb->planes[plane - 1].mem_priv); |
a00d0266 MS |
217 | vb->planes[plane - 1].mem_priv = NULL; |
218 | } | |
e23ccc0a PO |
219 | |
220 | return -ENOMEM; | |
221 | } | |
222 | ||
223 | /** | |
224 | * __vb2_buf_mem_free() - free memory of the given buffer | |
225 | */ | |
226 | static void __vb2_buf_mem_free(struct vb2_buffer *vb) | |
227 | { | |
e23ccc0a PO |
228 | unsigned int plane; |
229 | ||
230 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
a1d36d8c | 231 | call_void_memop(vb, put, vb->planes[plane].mem_priv); |
e23ccc0a | 232 | vb->planes[plane].mem_priv = NULL; |
3050040b | 233 | dprintk(3, "freed plane %d of buffer %d\n", plane, |
a00d0266 | 234 | vb->v4l2_buf.index); |
e23ccc0a PO |
235 | } |
236 | } | |
237 | ||
238 | /** | |
239 | * __vb2_buf_userptr_put() - release userspace memory associated with | |
240 | * a USERPTR buffer | |
241 | */ | |
242 | static void __vb2_buf_userptr_put(struct vb2_buffer *vb) | |
243 | { | |
e23ccc0a PO |
244 | unsigned int plane; |
245 | ||
246 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
a00d0266 | 247 | if (vb->planes[plane].mem_priv) |
a1d36d8c | 248 | call_void_memop(vb, put_userptr, vb->planes[plane].mem_priv); |
a00d0266 | 249 | vb->planes[plane].mem_priv = NULL; |
e23ccc0a PO |
250 | } |
251 | } | |
252 | ||
c5384048 SS |
253 | /** |
254 | * __vb2_plane_dmabuf_put() - release memory associated with | |
255 | * a DMABUF shared plane | |
256 | */ | |
b5b4541e | 257 | static void __vb2_plane_dmabuf_put(struct vb2_buffer *vb, struct vb2_plane *p) |
c5384048 SS |
258 | { |
259 | if (!p->mem_priv) | |
260 | return; | |
261 | ||
262 | if (p->dbuf_mapped) | |
a1d36d8c | 263 | call_void_memop(vb, unmap_dmabuf, p->mem_priv); |
c5384048 | 264 | |
a1d36d8c | 265 | call_void_memop(vb, detach_dmabuf, p->mem_priv); |
c5384048 SS |
266 | dma_buf_put(p->dbuf); |
267 | memset(p, 0, sizeof(*p)); | |
268 | } | |
269 | ||
270 | /** | |
271 | * __vb2_buf_dmabuf_put() - release memory associated with | |
272 | * a DMABUF shared buffer | |
273 | */ | |
274 | static void __vb2_buf_dmabuf_put(struct vb2_buffer *vb) | |
275 | { | |
c5384048 SS |
276 | unsigned int plane; |
277 | ||
278 | for (plane = 0; plane < vb->num_planes; ++plane) | |
b5b4541e | 279 | __vb2_plane_dmabuf_put(vb, &vb->planes[plane]); |
c5384048 SS |
280 | } |
281 | ||
a5e3d743 HV |
282 | /** |
283 | * __setup_lengths() - setup initial lengths for every plane in | |
284 | * every buffer on the queue | |
285 | */ | |
286 | static void __setup_lengths(struct vb2_queue *q, unsigned int n) | |
287 | { | |
288 | unsigned int buffer, plane; | |
289 | struct vb2_buffer *vb; | |
290 | ||
291 | for (buffer = q->num_buffers; buffer < q->num_buffers + n; ++buffer) { | |
292 | vb = q->bufs[buffer]; | |
293 | if (!vb) | |
294 | continue; | |
295 | ||
296 | for (plane = 0; plane < vb->num_planes; ++plane) | |
297 | vb->v4l2_planes[plane].length = q->plane_sizes[plane]; | |
298 | } | |
299 | } | |
300 | ||
e23ccc0a PO |
301 | /** |
302 | * __setup_offsets() - setup unique offsets ("cookies") for every plane in | |
303 | * every buffer on the queue | |
304 | */ | |
2d86401c | 305 | static void __setup_offsets(struct vb2_queue *q, unsigned int n) |
e23ccc0a PO |
306 | { |
307 | unsigned int buffer, plane; | |
308 | struct vb2_buffer *vb; | |
2d86401c | 309 | unsigned long off; |
e23ccc0a | 310 | |
2d86401c GL |
311 | if (q->num_buffers) { |
312 | struct v4l2_plane *p; | |
313 | vb = q->bufs[q->num_buffers - 1]; | |
314 | p = &vb->v4l2_planes[vb->num_planes - 1]; | |
315 | off = PAGE_ALIGN(p->m.mem_offset + p->length); | |
316 | } else { | |
317 | off = 0; | |
318 | } | |
319 | ||
320 | for (buffer = q->num_buffers; buffer < q->num_buffers + n; ++buffer) { | |
e23ccc0a PO |
321 | vb = q->bufs[buffer]; |
322 | if (!vb) | |
323 | continue; | |
324 | ||
325 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
326 | vb->v4l2_planes[plane].m.mem_offset = off; | |
327 | ||
3050040b | 328 | dprintk(3, "buffer %d, plane %d offset 0x%08lx\n", |
e23ccc0a PO |
329 | buffer, plane, off); |
330 | ||
331 | off += vb->v4l2_planes[plane].length; | |
332 | off = PAGE_ALIGN(off); | |
333 | } | |
334 | } | |
335 | } | |
336 | ||
337 | /** | |
338 | * __vb2_queue_alloc() - allocate videobuf buffer structures and (for MMAP type) | |
339 | * video buffer memory for all buffers/planes on the queue and initializes the | |
340 | * queue | |
341 | * | |
342 | * Returns the number of buffers successfully allocated. | |
343 | */ | |
344 | static int __vb2_queue_alloc(struct vb2_queue *q, enum v4l2_memory memory, | |
c1426bc7 | 345 | unsigned int num_buffers, unsigned int num_planes) |
e23ccc0a PO |
346 | { |
347 | unsigned int buffer; | |
348 | struct vb2_buffer *vb; | |
349 | int ret; | |
350 | ||
351 | for (buffer = 0; buffer < num_buffers; ++buffer) { | |
352 | /* Allocate videobuf buffer structures */ | |
353 | vb = kzalloc(q->buf_struct_size, GFP_KERNEL); | |
354 | if (!vb) { | |
3050040b | 355 | dprintk(1, "memory alloc for buffer struct failed\n"); |
e23ccc0a PO |
356 | break; |
357 | } | |
358 | ||
359 | /* Length stores number of planes for multiplanar buffers */ | |
360 | if (V4L2_TYPE_IS_MULTIPLANAR(q->type)) | |
361 | vb->v4l2_buf.length = num_planes; | |
362 | ||
363 | vb->state = VB2_BUF_STATE_DEQUEUED; | |
364 | vb->vb2_queue = q; | |
365 | vb->num_planes = num_planes; | |
2d86401c | 366 | vb->v4l2_buf.index = q->num_buffers + buffer; |
e23ccc0a PO |
367 | vb->v4l2_buf.type = q->type; |
368 | vb->v4l2_buf.memory = memory; | |
369 | ||
370 | /* Allocate video buffer memory for the MMAP type */ | |
371 | if (memory == V4L2_MEMORY_MMAP) { | |
c1426bc7 | 372 | ret = __vb2_buf_mem_alloc(vb); |
e23ccc0a | 373 | if (ret) { |
3050040b | 374 | dprintk(1, "failed allocating memory for " |
e23ccc0a PO |
375 | "buffer %d\n", buffer); |
376 | kfree(vb); | |
377 | break; | |
378 | } | |
379 | /* | |
380 | * Call the driver-provided buffer initialization | |
381 | * callback, if given. An error in initialization | |
382 | * results in queue setup failure. | |
383 | */ | |
b5b4541e | 384 | ret = call_vb_qop(vb, buf_init, vb); |
e23ccc0a | 385 | if (ret) { |
3050040b | 386 | dprintk(1, "buffer %d %p initialization" |
e23ccc0a PO |
387 | " failed\n", buffer, vb); |
388 | __vb2_buf_mem_free(vb); | |
389 | kfree(vb); | |
390 | break; | |
391 | } | |
392 | } | |
393 | ||
2d86401c | 394 | q->bufs[q->num_buffers + buffer] = vb; |
e23ccc0a PO |
395 | } |
396 | ||
a5e3d743 | 397 | __setup_lengths(q, buffer); |
dc77523c PZ |
398 | if (memory == V4L2_MEMORY_MMAP) |
399 | __setup_offsets(q, buffer); | |
e23ccc0a | 400 | |
3050040b | 401 | dprintk(1, "allocated %d buffers, %d plane(s) each\n", |
2d86401c | 402 | buffer, num_planes); |
e23ccc0a PO |
403 | |
404 | return buffer; | |
405 | } | |
406 | ||
407 | /** | |
408 | * __vb2_free_mem() - release all video buffer memory for a given queue | |
409 | */ | |
2d86401c | 410 | static void __vb2_free_mem(struct vb2_queue *q, unsigned int buffers) |
e23ccc0a PO |
411 | { |
412 | unsigned int buffer; | |
413 | struct vb2_buffer *vb; | |
414 | ||
2d86401c GL |
415 | for (buffer = q->num_buffers - buffers; buffer < q->num_buffers; |
416 | ++buffer) { | |
e23ccc0a PO |
417 | vb = q->bufs[buffer]; |
418 | if (!vb) | |
419 | continue; | |
420 | ||
421 | /* Free MMAP buffers or release USERPTR buffers */ | |
422 | if (q->memory == V4L2_MEMORY_MMAP) | |
423 | __vb2_buf_mem_free(vb); | |
c5384048 SS |
424 | else if (q->memory == V4L2_MEMORY_DMABUF) |
425 | __vb2_buf_dmabuf_put(vb); | |
e23ccc0a PO |
426 | else |
427 | __vb2_buf_userptr_put(vb); | |
428 | } | |
429 | } | |
430 | ||
431 | /** | |
2d86401c GL |
432 | * __vb2_queue_free() - free buffers at the end of the queue - video memory and |
433 | * related information, if no buffers are left return the queue to an | |
434 | * uninitialized state. Might be called even if the queue has already been freed. | |
e23ccc0a | 435 | */ |
63faabfd | 436 | static int __vb2_queue_free(struct vb2_queue *q, unsigned int buffers) |
e23ccc0a PO |
437 | { |
438 | unsigned int buffer; | |
439 | ||
63faabfd HV |
440 | /* |
441 | * Sanity check: when preparing a buffer the queue lock is released for | |
442 | * a short while (see __buf_prepare for the details), which would allow | |
443 | * a race with a reqbufs which can call this function. Removing the | |
444 | * buffers from underneath __buf_prepare is obviously a bad idea, so we | |
445 | * check if any of the buffers is in the state PREPARING, and if so we | |
446 | * just return -EAGAIN. | |
447 | */ | |
448 | for (buffer = q->num_buffers - buffers; buffer < q->num_buffers; | |
449 | ++buffer) { | |
450 | if (q->bufs[buffer] == NULL) | |
451 | continue; | |
452 | if (q->bufs[buffer]->state == VB2_BUF_STATE_PREPARING) { | |
fd4354cf | 453 | dprintk(1, "preparing buffers, cannot free\n"); |
63faabfd HV |
454 | return -EAGAIN; |
455 | } | |
456 | } | |
457 | ||
e23ccc0a | 458 | /* Call driver-provided cleanup function for each buffer, if provided */ |
b5b4541e HV |
459 | for (buffer = q->num_buffers - buffers; buffer < q->num_buffers; |
460 | ++buffer) { | |
256f3162 HV |
461 | struct vb2_buffer *vb = q->bufs[buffer]; |
462 | ||
463 | if (vb && vb->planes[0].mem_priv) | |
a1d36d8c | 464 | call_void_vb_qop(vb, buf_cleanup, vb); |
e23ccc0a PO |
465 | } |
466 | ||
467 | /* Release video buffer memory */ | |
2d86401c | 468 | __vb2_free_mem(q, buffers); |
e23ccc0a | 469 | |
b5b4541e HV |
470 | #ifdef CONFIG_VIDEO_ADV_DEBUG |
471 | /* | |
472 | * Check that all the calls were balances during the life-time of this | |
473 | * queue. If not (or if the debug level is 1 or up), then dump the | |
474 | * counters to the kernel log. | |
475 | */ | |
476 | if (q->num_buffers) { | |
477 | bool unbalanced = q->cnt_start_streaming != q->cnt_stop_streaming || | |
478 | q->cnt_wait_prepare != q->cnt_wait_finish; | |
479 | ||
480 | if (unbalanced || debug) { | |
481 | pr_info("vb2: counters for queue %p:%s\n", q, | |
482 | unbalanced ? " UNBALANCED!" : ""); | |
483 | pr_info("vb2: setup: %u start_streaming: %u stop_streaming: %u\n", | |
484 | q->cnt_queue_setup, q->cnt_start_streaming, | |
485 | q->cnt_stop_streaming); | |
486 | pr_info("vb2: wait_prepare: %u wait_finish: %u\n", | |
487 | q->cnt_wait_prepare, q->cnt_wait_finish); | |
488 | } | |
489 | q->cnt_queue_setup = 0; | |
490 | q->cnt_wait_prepare = 0; | |
491 | q->cnt_wait_finish = 0; | |
492 | q->cnt_start_streaming = 0; | |
493 | q->cnt_stop_streaming = 0; | |
494 | } | |
495 | for (buffer = 0; buffer < q->num_buffers; ++buffer) { | |
496 | struct vb2_buffer *vb = q->bufs[buffer]; | |
497 | bool unbalanced = vb->cnt_mem_alloc != vb->cnt_mem_put || | |
498 | vb->cnt_mem_prepare != vb->cnt_mem_finish || | |
499 | vb->cnt_mem_get_userptr != vb->cnt_mem_put_userptr || | |
500 | vb->cnt_mem_attach_dmabuf != vb->cnt_mem_detach_dmabuf || | |
501 | vb->cnt_mem_map_dmabuf != vb->cnt_mem_unmap_dmabuf || | |
502 | vb->cnt_buf_queue != vb->cnt_buf_done || | |
503 | vb->cnt_buf_prepare != vb->cnt_buf_finish || | |
504 | vb->cnt_buf_init != vb->cnt_buf_cleanup; | |
505 | ||
506 | if (unbalanced || debug) { | |
507 | pr_info("vb2: counters for queue %p, buffer %d:%s\n", | |
508 | q, buffer, unbalanced ? " UNBALANCED!" : ""); | |
509 | pr_info("vb2: buf_init: %u buf_cleanup: %u buf_prepare: %u buf_finish: %u\n", | |
510 | vb->cnt_buf_init, vb->cnt_buf_cleanup, | |
511 | vb->cnt_buf_prepare, vb->cnt_buf_finish); | |
512 | pr_info("vb2: buf_queue: %u buf_done: %u\n", | |
513 | vb->cnt_buf_queue, vb->cnt_buf_done); | |
514 | pr_info("vb2: alloc: %u put: %u prepare: %u finish: %u mmap: %u\n", | |
515 | vb->cnt_mem_alloc, vb->cnt_mem_put, | |
516 | vb->cnt_mem_prepare, vb->cnt_mem_finish, | |
517 | vb->cnt_mem_mmap); | |
518 | pr_info("vb2: get_userptr: %u put_userptr: %u\n", | |
519 | vb->cnt_mem_get_userptr, vb->cnt_mem_put_userptr); | |
520 | pr_info("vb2: attach_dmabuf: %u detach_dmabuf: %u map_dmabuf: %u unmap_dmabuf: %u\n", | |
521 | vb->cnt_mem_attach_dmabuf, vb->cnt_mem_detach_dmabuf, | |
522 | vb->cnt_mem_map_dmabuf, vb->cnt_mem_unmap_dmabuf); | |
523 | pr_info("vb2: get_dmabuf: %u num_users: %u vaddr: %u cookie: %u\n", | |
524 | vb->cnt_mem_get_dmabuf, | |
525 | vb->cnt_mem_num_users, | |
526 | vb->cnt_mem_vaddr, | |
527 | vb->cnt_mem_cookie); | |
528 | } | |
529 | } | |
530 | #endif | |
531 | ||
e23ccc0a | 532 | /* Free videobuf buffers */ |
2d86401c GL |
533 | for (buffer = q->num_buffers - buffers; buffer < q->num_buffers; |
534 | ++buffer) { | |
e23ccc0a PO |
535 | kfree(q->bufs[buffer]); |
536 | q->bufs[buffer] = NULL; | |
537 | } | |
538 | ||
2d86401c | 539 | q->num_buffers -= buffers; |
a7afcacc | 540 | if (!q->num_buffers) { |
2d86401c | 541 | q->memory = 0; |
a7afcacc HV |
542 | INIT_LIST_HEAD(&q->queued_list); |
543 | } | |
63faabfd | 544 | return 0; |
e23ccc0a PO |
545 | } |
546 | ||
547 | /** | |
548 | * __verify_planes_array() - verify that the planes array passed in struct | |
549 | * v4l2_buffer from userspace can be safely used | |
550 | */ | |
2d86401c | 551 | static int __verify_planes_array(struct vb2_buffer *vb, const struct v4l2_buffer *b) |
e23ccc0a | 552 | { |
32a77260 HV |
553 | if (!V4L2_TYPE_IS_MULTIPLANAR(b->type)) |
554 | return 0; | |
555 | ||
e23ccc0a PO |
556 | /* Is memory for copying plane information present? */ |
557 | if (NULL == b->m.planes) { | |
3050040b | 558 | dprintk(1, "multi-planar buffer passed but " |
e23ccc0a PO |
559 | "planes array not provided\n"); |
560 | return -EINVAL; | |
561 | } | |
562 | ||
563 | if (b->length < vb->num_planes || b->length > VIDEO_MAX_PLANES) { | |
3050040b | 564 | dprintk(1, "incorrect planes array length, " |
e23ccc0a PO |
565 | "expected %d, got %d\n", vb->num_planes, b->length); |
566 | return -EINVAL; | |
567 | } | |
568 | ||
569 | return 0; | |
570 | } | |
571 | ||
8023ed09 LP |
572 | /** |
573 | * __verify_length() - Verify that the bytesused value for each plane fits in | |
574 | * the plane length and that the data offset doesn't exceed the bytesused value. | |
575 | */ | |
576 | static int __verify_length(struct vb2_buffer *vb, const struct v4l2_buffer *b) | |
577 | { | |
578 | unsigned int length; | |
579 | unsigned int plane; | |
580 | ||
581 | if (!V4L2_TYPE_IS_OUTPUT(b->type)) | |
582 | return 0; | |
583 | ||
584 | if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) { | |
585 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
586 | length = (b->memory == V4L2_MEMORY_USERPTR) | |
587 | ? b->m.planes[plane].length | |
588 | : vb->v4l2_planes[plane].length; | |
589 | ||
590 | if (b->m.planes[plane].bytesused > length) | |
591 | return -EINVAL; | |
3c5c23c5 SN |
592 | |
593 | if (b->m.planes[plane].data_offset > 0 && | |
594 | b->m.planes[plane].data_offset >= | |
8023ed09 LP |
595 | b->m.planes[plane].bytesused) |
596 | return -EINVAL; | |
597 | } | |
598 | } else { | |
599 | length = (b->memory == V4L2_MEMORY_USERPTR) | |
600 | ? b->length : vb->v4l2_planes[0].length; | |
601 | ||
602 | if (b->bytesused > length) | |
603 | return -EINVAL; | |
604 | } | |
605 | ||
606 | return 0; | |
607 | } | |
608 | ||
25a27d91 MS |
609 | /** |
610 | * __buffer_in_use() - return true if the buffer is in use and | |
611 | * the queue cannot be freed (by the means of REQBUFS(0)) call | |
612 | */ | |
613 | static bool __buffer_in_use(struct vb2_queue *q, struct vb2_buffer *vb) | |
614 | { | |
615 | unsigned int plane; | |
616 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
2c2dd6ac | 617 | void *mem_priv = vb->planes[plane].mem_priv; |
25a27d91 MS |
618 | /* |
619 | * If num_users() has not been provided, call_memop | |
620 | * will return 0, apparently nobody cares about this | |
621 | * case anyway. If num_users() returns more than 1, | |
622 | * we are not the only user of the plane's memory. | |
623 | */ | |
b5b4541e | 624 | if (mem_priv && call_memop(vb, num_users, mem_priv) > 1) |
25a27d91 MS |
625 | return true; |
626 | } | |
627 | return false; | |
628 | } | |
629 | ||
630 | /** | |
631 | * __buffers_in_use() - return true if any buffers on the queue are in use and | |
632 | * the queue cannot be freed (by the means of REQBUFS(0)) call | |
633 | */ | |
634 | static bool __buffers_in_use(struct vb2_queue *q) | |
635 | { | |
636 | unsigned int buffer; | |
637 | for (buffer = 0; buffer < q->num_buffers; ++buffer) { | |
638 | if (__buffer_in_use(q, q->bufs[buffer])) | |
639 | return true; | |
640 | } | |
641 | return false; | |
642 | } | |
643 | ||
e23ccc0a PO |
644 | /** |
645 | * __fill_v4l2_buffer() - fill in a struct v4l2_buffer with information to be | |
646 | * returned to userspace | |
647 | */ | |
32a77260 | 648 | static void __fill_v4l2_buffer(struct vb2_buffer *vb, struct v4l2_buffer *b) |
e23ccc0a PO |
649 | { |
650 | struct vb2_queue *q = vb->vb2_queue; | |
e23ccc0a | 651 | |
2b719d7b | 652 | /* Copy back data such as timestamp, flags, etc. */ |
e23ccc0a | 653 | memcpy(b, &vb->v4l2_buf, offsetof(struct v4l2_buffer, m)); |
2b719d7b | 654 | b->reserved2 = vb->v4l2_buf.reserved2; |
e23ccc0a PO |
655 | b->reserved = vb->v4l2_buf.reserved; |
656 | ||
657 | if (V4L2_TYPE_IS_MULTIPLANAR(q->type)) { | |
e23ccc0a PO |
658 | /* |
659 | * Fill in plane-related data if userspace provided an array | |
32a77260 | 660 | * for it. The caller has already verified memory and size. |
e23ccc0a | 661 | */ |
3c0b6061 | 662 | b->length = vb->num_planes; |
e23ccc0a PO |
663 | memcpy(b->m.planes, vb->v4l2_planes, |
664 | b->length * sizeof(struct v4l2_plane)); | |
665 | } else { | |
666 | /* | |
667 | * We use length and offset in v4l2_planes array even for | |
668 | * single-planar buffers, but userspace does not. | |
669 | */ | |
670 | b->length = vb->v4l2_planes[0].length; | |
671 | b->bytesused = vb->v4l2_planes[0].bytesused; | |
672 | if (q->memory == V4L2_MEMORY_MMAP) | |
673 | b->m.offset = vb->v4l2_planes[0].m.mem_offset; | |
674 | else if (q->memory == V4L2_MEMORY_USERPTR) | |
675 | b->m.userptr = vb->v4l2_planes[0].m.userptr; | |
c5384048 SS |
676 | else if (q->memory == V4L2_MEMORY_DMABUF) |
677 | b->m.fd = vb->v4l2_planes[0].m.fd; | |
e23ccc0a PO |
678 | } |
679 | ||
ea42c8ec MS |
680 | /* |
681 | * Clear any buffer state related flags. | |
682 | */ | |
1b18e7a0 | 683 | b->flags &= ~V4L2_BUFFER_MASK_FLAGS; |
7ce6fd8f SA |
684 | b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK; |
685 | if ((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) != | |
686 | V4L2_BUF_FLAG_TIMESTAMP_COPY) { | |
687 | /* | |
688 | * For non-COPY timestamps, drop timestamp source bits | |
689 | * and obtain the timestamp source from the queue. | |
690 | */ | |
691 | b->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK; | |
692 | b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TSTAMP_SRC_MASK; | |
693 | } | |
e23ccc0a PO |
694 | |
695 | switch (vb->state) { | |
696 | case VB2_BUF_STATE_QUEUED: | |
697 | case VB2_BUF_STATE_ACTIVE: | |
698 | b->flags |= V4L2_BUF_FLAG_QUEUED; | |
699 | break; | |
700 | case VB2_BUF_STATE_ERROR: | |
701 | b->flags |= V4L2_BUF_FLAG_ERROR; | |
702 | /* fall through */ | |
703 | case VB2_BUF_STATE_DONE: | |
704 | b->flags |= V4L2_BUF_FLAG_DONE; | |
705 | break; | |
ebc087d0 | 706 | case VB2_BUF_STATE_PREPARED: |
2d86401c GL |
707 | b->flags |= V4L2_BUF_FLAG_PREPARED; |
708 | break; | |
b18a8ff2 | 709 | case VB2_BUF_STATE_PREPARING: |
2d86401c | 710 | case VB2_BUF_STATE_DEQUEUED: |
e23ccc0a PO |
711 | /* nothing */ |
712 | break; | |
713 | } | |
714 | ||
25a27d91 | 715 | if (__buffer_in_use(q, vb)) |
e23ccc0a | 716 | b->flags |= V4L2_BUF_FLAG_MAPPED; |
e23ccc0a PO |
717 | } |
718 | ||
719 | /** | |
720 | * vb2_querybuf() - query video buffer information | |
721 | * @q: videobuf queue | |
722 | * @b: buffer struct passed from userspace to vidioc_querybuf handler | |
723 | * in driver | |
724 | * | |
725 | * Should be called from vidioc_querybuf ioctl handler in driver. | |
726 | * This function will verify the passed v4l2_buffer structure and fill the | |
727 | * relevant information for the userspace. | |
728 | * | |
729 | * The return values from this function are intended to be directly returned | |
730 | * from vidioc_querybuf handler in driver. | |
731 | */ | |
732 | int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b) | |
733 | { | |
734 | struct vb2_buffer *vb; | |
32a77260 | 735 | int ret; |
e23ccc0a PO |
736 | |
737 | if (b->type != q->type) { | |
fd4354cf | 738 | dprintk(1, "wrong buffer type\n"); |
e23ccc0a PO |
739 | return -EINVAL; |
740 | } | |
741 | ||
742 | if (b->index >= q->num_buffers) { | |
fd4354cf | 743 | dprintk(1, "buffer index out of range\n"); |
e23ccc0a PO |
744 | return -EINVAL; |
745 | } | |
746 | vb = q->bufs[b->index]; | |
32a77260 HV |
747 | ret = __verify_planes_array(vb, b); |
748 | if (!ret) | |
749 | __fill_v4l2_buffer(vb, b); | |
750 | return ret; | |
e23ccc0a PO |
751 | } |
752 | EXPORT_SYMBOL(vb2_querybuf); | |
753 | ||
754 | /** | |
755 | * __verify_userptr_ops() - verify that all memory operations required for | |
756 | * USERPTR queue type have been provided | |
757 | */ | |
758 | static int __verify_userptr_ops(struct vb2_queue *q) | |
759 | { | |
760 | if (!(q->io_modes & VB2_USERPTR) || !q->mem_ops->get_userptr || | |
761 | !q->mem_ops->put_userptr) | |
762 | return -EINVAL; | |
763 | ||
764 | return 0; | |
765 | } | |
766 | ||
767 | /** | |
768 | * __verify_mmap_ops() - verify that all memory operations required for | |
769 | * MMAP queue type have been provided | |
770 | */ | |
771 | static int __verify_mmap_ops(struct vb2_queue *q) | |
772 | { | |
773 | if (!(q->io_modes & VB2_MMAP) || !q->mem_ops->alloc || | |
774 | !q->mem_ops->put || !q->mem_ops->mmap) | |
775 | return -EINVAL; | |
776 | ||
777 | return 0; | |
778 | } | |
779 | ||
c5384048 SS |
780 | /** |
781 | * __verify_dmabuf_ops() - verify that all memory operations required for | |
782 | * DMABUF queue type have been provided | |
783 | */ | |
784 | static int __verify_dmabuf_ops(struct vb2_queue *q) | |
785 | { | |
786 | if (!(q->io_modes & VB2_DMABUF) || !q->mem_ops->attach_dmabuf || | |
787 | !q->mem_ops->detach_dmabuf || !q->mem_ops->map_dmabuf || | |
788 | !q->mem_ops->unmap_dmabuf) | |
789 | return -EINVAL; | |
790 | ||
791 | return 0; | |
792 | } | |
793 | ||
e23ccc0a | 794 | /** |
37d9ed94 HV |
795 | * __verify_memory_type() - Check whether the memory type and buffer type |
796 | * passed to a buffer operation are compatible with the queue. | |
797 | */ | |
798 | static int __verify_memory_type(struct vb2_queue *q, | |
799 | enum v4l2_memory memory, enum v4l2_buf_type type) | |
800 | { | |
c5384048 SS |
801 | if (memory != V4L2_MEMORY_MMAP && memory != V4L2_MEMORY_USERPTR && |
802 | memory != V4L2_MEMORY_DMABUF) { | |
fd4354cf | 803 | dprintk(1, "unsupported memory type\n"); |
37d9ed94 HV |
804 | return -EINVAL; |
805 | } | |
806 | ||
807 | if (type != q->type) { | |
fd4354cf | 808 | dprintk(1, "requested type is incorrect\n"); |
37d9ed94 HV |
809 | return -EINVAL; |
810 | } | |
811 | ||
812 | /* | |
813 | * Make sure all the required memory ops for given memory type | |
814 | * are available. | |
815 | */ | |
816 | if (memory == V4L2_MEMORY_MMAP && __verify_mmap_ops(q)) { | |
fd4354cf | 817 | dprintk(1, "MMAP for current setup unsupported\n"); |
37d9ed94 HV |
818 | return -EINVAL; |
819 | } | |
820 | ||
821 | if (memory == V4L2_MEMORY_USERPTR && __verify_userptr_ops(q)) { | |
fd4354cf | 822 | dprintk(1, "USERPTR for current setup unsupported\n"); |
37d9ed94 HV |
823 | return -EINVAL; |
824 | } | |
825 | ||
c5384048 | 826 | if (memory == V4L2_MEMORY_DMABUF && __verify_dmabuf_ops(q)) { |
fd4354cf | 827 | dprintk(1, "DMABUF for current setup unsupported\n"); |
c5384048 SS |
828 | return -EINVAL; |
829 | } | |
830 | ||
37d9ed94 HV |
831 | /* |
832 | * Place the busy tests at the end: -EBUSY can be ignored when | |
833 | * create_bufs is called with count == 0, but count == 0 should still | |
834 | * do the memory and type validation. | |
835 | */ | |
74753cff | 836 | if (vb2_fileio_is_active(q)) { |
fd4354cf | 837 | dprintk(1, "file io in progress\n"); |
37d9ed94 HV |
838 | return -EBUSY; |
839 | } | |
840 | return 0; | |
841 | } | |
842 | ||
843 | /** | |
844 | * __reqbufs() - Initiate streaming | |
e23ccc0a PO |
845 | * @q: videobuf2 queue |
846 | * @req: struct passed from userspace to vidioc_reqbufs handler in driver | |
847 | * | |
848 | * Should be called from vidioc_reqbufs ioctl handler of a driver. | |
849 | * This function: | |
850 | * 1) verifies streaming parameters passed from the userspace, | |
851 | * 2) sets up the queue, | |
852 | * 3) negotiates number of buffers and planes per buffer with the driver | |
853 | * to be used during streaming, | |
854 | * 4) allocates internal buffer structures (struct vb2_buffer), according to | |
855 | * the agreed parameters, | |
856 | * 5) for MMAP memory type, allocates actual video memory, using the | |
857 | * memory handling/allocation routines provided during queue initialization | |
858 | * | |
859 | * If req->count is 0, all the memory will be freed instead. | |
860 | * If the queue has been allocated previously (by a previous vb2_reqbufs) call | |
861 | * and the queue is not busy, memory will be reallocated. | |
862 | * | |
863 | * The return values from this function are intended to be directly returned | |
864 | * from vidioc_reqbufs handler in driver. | |
865 | */ | |
37d9ed94 | 866 | static int __reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req) |
e23ccc0a | 867 | { |
2d86401c | 868 | unsigned int num_buffers, allocated_buffers, num_planes = 0; |
37d9ed94 | 869 | int ret; |
e23ccc0a PO |
870 | |
871 | if (q->streaming) { | |
fd4354cf | 872 | dprintk(1, "streaming active\n"); |
e23ccc0a PO |
873 | return -EBUSY; |
874 | } | |
875 | ||
29e3fbd8 | 876 | if (req->count == 0 || q->num_buffers != 0 || q->memory != req->memory) { |
e23ccc0a PO |
877 | /* |
878 | * We already have buffers allocated, so first check if they | |
879 | * are not in use and can be freed. | |
880 | */ | |
881 | if (q->memory == V4L2_MEMORY_MMAP && __buffers_in_use(q)) { | |
fd4354cf | 882 | dprintk(1, "memory in use, cannot free\n"); |
e23ccc0a PO |
883 | return -EBUSY; |
884 | } | |
885 | ||
fb64dca8 HV |
886 | /* |
887 | * Call queue_cancel to clean up any buffers in the PREPARED or | |
888 | * QUEUED state which is possible if buffers were prepared or | |
889 | * queued without ever calling STREAMON. | |
890 | */ | |
891 | __vb2_queue_cancel(q); | |
63faabfd HV |
892 | ret = __vb2_queue_free(q, q->num_buffers); |
893 | if (ret) | |
894 | return ret; | |
29e3fbd8 MS |
895 | |
896 | /* | |
897 | * In case of REQBUFS(0) return immediately without calling | |
898 | * driver's queue_setup() callback and allocating resources. | |
899 | */ | |
900 | if (req->count == 0) | |
901 | return 0; | |
e23ccc0a PO |
902 | } |
903 | ||
904 | /* | |
905 | * Make sure the requested values and current defaults are sane. | |
906 | */ | |
907 | num_buffers = min_t(unsigned int, req->count, VIDEO_MAX_FRAME); | |
4cf743de | 908 | num_buffers = max_t(unsigned int, num_buffers, q->min_buffers_needed); |
c1426bc7 | 909 | memset(q->plane_sizes, 0, sizeof(q->plane_sizes)); |
e23ccc0a | 910 | memset(q->alloc_ctx, 0, sizeof(q->alloc_ctx)); |
13b14095 | 911 | q->memory = req->memory; |
e23ccc0a PO |
912 | |
913 | /* | |
914 | * Ask the driver how many buffers and planes per buffer it requires. | |
915 | * Driver also sets the size and allocator context for each plane. | |
916 | */ | |
fc714e70 | 917 | ret = call_qop(q, queue_setup, q, NULL, &num_buffers, &num_planes, |
c1426bc7 | 918 | q->plane_sizes, q->alloc_ctx); |
a1d36d8c | 919 | if (ret) |
e23ccc0a PO |
920 | return ret; |
921 | ||
922 | /* Finally, allocate buffers and video memory */ | |
a7afcacc HV |
923 | allocated_buffers = __vb2_queue_alloc(q, req->memory, num_buffers, num_planes); |
924 | if (allocated_buffers == 0) { | |
3050040b | 925 | dprintk(1, "memory allocation failed\n"); |
66072d4f | 926 | return -ENOMEM; |
e23ccc0a PO |
927 | } |
928 | ||
b3379c62 HV |
929 | /* |
930 | * There is no point in continuing if we can't allocate the minimum | |
931 | * number of buffers needed by this vb2_queue. | |
932 | */ | |
933 | if (allocated_buffers < q->min_buffers_needed) | |
934 | ret = -ENOMEM; | |
935 | ||
e23ccc0a PO |
936 | /* |
937 | * Check if driver can handle the allocated number of buffers. | |
938 | */ | |
b3379c62 | 939 | if (!ret && allocated_buffers < num_buffers) { |
2d86401c | 940 | num_buffers = allocated_buffers; |
e23ccc0a | 941 | |
fc714e70 GL |
942 | ret = call_qop(q, queue_setup, q, NULL, &num_buffers, |
943 | &num_planes, q->plane_sizes, q->alloc_ctx); | |
e23ccc0a | 944 | |
2d86401c | 945 | if (!ret && allocated_buffers < num_buffers) |
e23ccc0a | 946 | ret = -ENOMEM; |
e23ccc0a PO |
947 | |
948 | /* | |
2d86401c GL |
949 | * Either the driver has accepted a smaller number of buffers, |
950 | * or .queue_setup() returned an error | |
e23ccc0a | 951 | */ |
2d86401c GL |
952 | } |
953 | ||
954 | q->num_buffers = allocated_buffers; | |
955 | ||
956 | if (ret < 0) { | |
a7afcacc HV |
957 | /* |
958 | * Note: __vb2_queue_free() will subtract 'allocated_buffers' | |
959 | * from q->num_buffers. | |
960 | */ | |
2d86401c GL |
961 | __vb2_queue_free(q, allocated_buffers); |
962 | return ret; | |
e23ccc0a PO |
963 | } |
964 | ||
e23ccc0a PO |
965 | /* |
966 | * Return the number of successfully allocated buffers | |
967 | * to the userspace. | |
968 | */ | |
2d86401c | 969 | req->count = allocated_buffers; |
e23ccc0a PO |
970 | |
971 | return 0; | |
e23ccc0a | 972 | } |
37d9ed94 HV |
973 | |
974 | /** | |
975 | * vb2_reqbufs() - Wrapper for __reqbufs() that also verifies the memory and | |
976 | * type values. | |
977 | * @q: videobuf2 queue | |
978 | * @req: struct passed from userspace to vidioc_reqbufs handler in driver | |
979 | */ | |
980 | int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req) | |
981 | { | |
982 | int ret = __verify_memory_type(q, req->memory, req->type); | |
983 | ||
984 | return ret ? ret : __reqbufs(q, req); | |
985 | } | |
e23ccc0a PO |
986 | EXPORT_SYMBOL_GPL(vb2_reqbufs); |
987 | ||
2d86401c | 988 | /** |
37d9ed94 | 989 | * __create_bufs() - Allocate buffers and any required auxiliary structs |
2d86401c GL |
990 | * @q: videobuf2 queue |
991 | * @create: creation parameters, passed from userspace to vidioc_create_bufs | |
992 | * handler in driver | |
993 | * | |
994 | * Should be called from vidioc_create_bufs ioctl handler of a driver. | |
995 | * This function: | |
996 | * 1) verifies parameter sanity | |
997 | * 2) calls the .queue_setup() queue operation | |
998 | * 3) performs any necessary memory allocations | |
999 | * | |
1000 | * The return values from this function are intended to be directly returned | |
1001 | * from vidioc_create_bufs handler in driver. | |
1002 | */ | |
37d9ed94 | 1003 | static int __create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) |
2d86401c GL |
1004 | { |
1005 | unsigned int num_planes = 0, num_buffers, allocated_buffers; | |
37d9ed94 | 1006 | int ret; |
2d86401c GL |
1007 | |
1008 | if (q->num_buffers == VIDEO_MAX_FRAME) { | |
fd4354cf | 1009 | dprintk(1, "maximum number of buffers already allocated\n"); |
2d86401c GL |
1010 | return -ENOBUFS; |
1011 | } | |
1012 | ||
2d86401c GL |
1013 | if (!q->num_buffers) { |
1014 | memset(q->plane_sizes, 0, sizeof(q->plane_sizes)); | |
1015 | memset(q->alloc_ctx, 0, sizeof(q->alloc_ctx)); | |
1016 | q->memory = create->memory; | |
1017 | } | |
1018 | ||
1019 | num_buffers = min(create->count, VIDEO_MAX_FRAME - q->num_buffers); | |
1020 | ||
1021 | /* | |
1022 | * Ask the driver, whether the requested number of buffers, planes per | |
1023 | * buffer and their sizes are acceptable | |
1024 | */ | |
1025 | ret = call_qop(q, queue_setup, q, &create->format, &num_buffers, | |
1026 | &num_planes, q->plane_sizes, q->alloc_ctx); | |
a1d36d8c | 1027 | if (ret) |
2d86401c GL |
1028 | return ret; |
1029 | ||
1030 | /* Finally, allocate buffers and video memory */ | |
a7afcacc | 1031 | allocated_buffers = __vb2_queue_alloc(q, create->memory, num_buffers, |
2d86401c | 1032 | num_planes); |
a7afcacc | 1033 | if (allocated_buffers == 0) { |
3050040b | 1034 | dprintk(1, "memory allocation failed\n"); |
f05393d2 | 1035 | return -ENOMEM; |
2d86401c GL |
1036 | } |
1037 | ||
2d86401c GL |
1038 | /* |
1039 | * Check if driver can handle the so far allocated number of buffers. | |
1040 | */ | |
a7afcacc HV |
1041 | if (allocated_buffers < num_buffers) { |
1042 | num_buffers = allocated_buffers; | |
2d86401c GL |
1043 | |
1044 | /* | |
1045 | * q->num_buffers contains the total number of buffers, that the | |
1046 | * queue driver has set up | |
1047 | */ | |
1048 | ret = call_qop(q, queue_setup, q, &create->format, &num_buffers, | |
1049 | &num_planes, q->plane_sizes, q->alloc_ctx); | |
1050 | ||
1051 | if (!ret && allocated_buffers < num_buffers) | |
1052 | ret = -ENOMEM; | |
1053 | ||
1054 | /* | |
1055 | * Either the driver has accepted a smaller number of buffers, | |
1056 | * or .queue_setup() returned an error | |
1057 | */ | |
1058 | } | |
1059 | ||
1060 | q->num_buffers += allocated_buffers; | |
1061 | ||
1062 | if (ret < 0) { | |
a7afcacc HV |
1063 | /* |
1064 | * Note: __vb2_queue_free() will subtract 'allocated_buffers' | |
1065 | * from q->num_buffers. | |
1066 | */ | |
2d86401c | 1067 | __vb2_queue_free(q, allocated_buffers); |
f05393d2 | 1068 | return -ENOMEM; |
2d86401c GL |
1069 | } |
1070 | ||
1071 | /* | |
1072 | * Return the number of successfully allocated buffers | |
1073 | * to the userspace. | |
1074 | */ | |
1075 | create->count = allocated_buffers; | |
1076 | ||
1077 | return 0; | |
1078 | } | |
37d9ed94 HV |
1079 | |
1080 | /** | |
53aa3b19 NT |
1081 | * vb2_create_bufs() - Wrapper for __create_bufs() that also verifies the |
1082 | * memory and type values. | |
37d9ed94 HV |
1083 | * @q: videobuf2 queue |
1084 | * @create: creation parameters, passed from userspace to vidioc_create_bufs | |
1085 | * handler in driver | |
1086 | */ | |
1087 | int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) | |
1088 | { | |
1089 | int ret = __verify_memory_type(q, create->memory, create->format.type); | |
1090 | ||
1091 | create->index = q->num_buffers; | |
f05393d2 HV |
1092 | if (create->count == 0) |
1093 | return ret != -EBUSY ? ret : 0; | |
37d9ed94 HV |
1094 | return ret ? ret : __create_bufs(q, create); |
1095 | } | |
2d86401c GL |
1096 | EXPORT_SYMBOL_GPL(vb2_create_bufs); |
1097 | ||
e23ccc0a PO |
1098 | /** |
1099 | * vb2_plane_vaddr() - Return a kernel virtual address of a given plane | |
1100 | * @vb: vb2_buffer to which the plane in question belongs to | |
1101 | * @plane_no: plane number for which the address is to be returned | |
1102 | * | |
1103 | * This function returns a kernel virtual address of a given plane if | |
1104 | * such a mapping exist, NULL otherwise. | |
1105 | */ | |
1106 | void *vb2_plane_vaddr(struct vb2_buffer *vb, unsigned int plane_no) | |
1107 | { | |
a00d0266 | 1108 | if (plane_no > vb->num_planes || !vb->planes[plane_no].mem_priv) |
e23ccc0a PO |
1109 | return NULL; |
1110 | ||
a1d36d8c | 1111 | return call_ptr_memop(vb, vaddr, vb->planes[plane_no].mem_priv); |
e23ccc0a PO |
1112 | |
1113 | } | |
1114 | EXPORT_SYMBOL_GPL(vb2_plane_vaddr); | |
1115 | ||
1116 | /** | |
1117 | * vb2_plane_cookie() - Return allocator specific cookie for the given plane | |
1118 | * @vb: vb2_buffer to which the plane in question belongs to | |
1119 | * @plane_no: plane number for which the cookie is to be returned | |
1120 | * | |
1121 | * This function returns an allocator specific cookie for a given plane if | |
1122 | * available, NULL otherwise. The allocator should provide some simple static | |
1123 | * inline function, which would convert this cookie to the allocator specific | |
1124 | * type that can be used directly by the driver to access the buffer. This can | |
1125 | * be for example physical address, pointer to scatter list or IOMMU mapping. | |
1126 | */ | |
1127 | void *vb2_plane_cookie(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, cookie, vb->planes[plane_no].mem_priv); |
e23ccc0a PO |
1133 | } |
1134 | EXPORT_SYMBOL_GPL(vb2_plane_cookie); | |
1135 | ||
1136 | /** | |
1137 | * vb2_buffer_done() - inform videobuf that an operation on a buffer is finished | |
1138 | * @vb: vb2_buffer returned from the driver | |
1139 | * @state: either VB2_BUF_STATE_DONE if the operation finished successfully | |
b3379c62 HV |
1140 | * or VB2_BUF_STATE_ERROR if the operation finished with an error. |
1141 | * If start_streaming fails then it should return buffers with state | |
1142 | * VB2_BUF_STATE_QUEUED to put them back into the queue. | |
e23ccc0a PO |
1143 | * |
1144 | * This function should be called by the driver after a hardware operation on | |
1145 | * a buffer is finished and the buffer may be returned to userspace. The driver | |
1146 | * cannot use this buffer anymore until it is queued back to it by videobuf | |
1147 | * by the means of buf_queue callback. Only buffers previously queued to the | |
1148 | * driver by buf_queue can be passed to this function. | |
b3379c62 HV |
1149 | * |
1150 | * While streaming a buffer can only be returned in state DONE or ERROR. | |
1151 | * The start_streaming op can also return them in case the DMA engine cannot | |
1152 | * be started for some reason. In that case the buffers should be returned with | |
1153 | * state QUEUED. | |
e23ccc0a PO |
1154 | */ |
1155 | void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state) | |
1156 | { | |
1157 | struct vb2_queue *q = vb->vb2_queue; | |
1158 | unsigned long flags; | |
3e0c2f20 | 1159 | unsigned int plane; |
e23ccc0a | 1160 | |
b3379c62 | 1161 | if (WARN_ON(vb->state != VB2_BUF_STATE_ACTIVE)) |
e23ccc0a PO |
1162 | return; |
1163 | ||
b3379c62 HV |
1164 | if (!q->start_streaming_called) { |
1165 | if (WARN_ON(state != VB2_BUF_STATE_QUEUED)) | |
1166 | state = VB2_BUF_STATE_QUEUED; | |
57394b72 HV |
1167 | } else if (WARN_ON(state != VB2_BUF_STATE_DONE && |
1168 | state != VB2_BUF_STATE_ERROR)) { | |
b3379c62 HV |
1169 | state = VB2_BUF_STATE_ERROR; |
1170 | } | |
e23ccc0a | 1171 | |
b5b4541e HV |
1172 | #ifdef CONFIG_VIDEO_ADV_DEBUG |
1173 | /* | |
1174 | * Although this is not a callback, it still does have to balance | |
1175 | * with the buf_queue op. So update this counter manually. | |
1176 | */ | |
1177 | vb->cnt_buf_done++; | |
1178 | #endif | |
3050040b | 1179 | dprintk(4, "done processing on buffer %d, state: %d\n", |
9b6f5dc0 | 1180 | vb->v4l2_buf.index, state); |
e23ccc0a | 1181 | |
3e0c2f20 MS |
1182 | /* sync buffers */ |
1183 | for (plane = 0; plane < vb->num_planes; ++plane) | |
a1d36d8c | 1184 | call_void_memop(vb, finish, vb->planes[plane].mem_priv); |
3e0c2f20 | 1185 | |
e23ccc0a PO |
1186 | /* Add the buffer to the done buffers list */ |
1187 | spin_lock_irqsave(&q->done_lock, flags); | |
1188 | vb->state = state; | |
b3379c62 HV |
1189 | if (state != VB2_BUF_STATE_QUEUED) |
1190 | list_add_tail(&vb->done_entry, &q->done_list); | |
6ea3b980 | 1191 | atomic_dec(&q->owned_by_drv_count); |
e23ccc0a PO |
1192 | spin_unlock_irqrestore(&q->done_lock, flags); |
1193 | ||
b3379c62 HV |
1194 | if (state == VB2_BUF_STATE_QUEUED) |
1195 | return; | |
1196 | ||
e23ccc0a PO |
1197 | /* Inform any processes that may be waiting for buffers */ |
1198 | wake_up(&q->done_wq); | |
1199 | } | |
1200 | EXPORT_SYMBOL_GPL(vb2_buffer_done); | |
1201 | ||
1202 | /** | |
32a77260 HV |
1203 | * __fill_vb2_buffer() - fill a vb2_buffer with information provided in a |
1204 | * v4l2_buffer by the userspace. The caller has already verified that struct | |
1205 | * v4l2_buffer has a valid number of planes. | |
e23ccc0a | 1206 | */ |
32a77260 | 1207 | static void __fill_vb2_buffer(struct vb2_buffer *vb, const struct v4l2_buffer *b, |
e23ccc0a PO |
1208 | struct v4l2_plane *v4l2_planes) |
1209 | { | |
1210 | unsigned int plane; | |
e23ccc0a PO |
1211 | |
1212 | if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) { | |
e23ccc0a PO |
1213 | /* Fill in driver-provided information for OUTPUT types */ |
1214 | if (V4L2_TYPE_IS_OUTPUT(b->type)) { | |
61bd8fb3 HV |
1215 | bool bytesused_is_used; |
1216 | ||
1217 | /* Check if bytesused == 0 for all planes */ | |
1218 | for (plane = 0; plane < vb->num_planes; ++plane) | |
1219 | if (b->m.planes[plane].bytesused) | |
1220 | break; | |
1221 | bytesused_is_used = plane < vb->num_planes; | |
1222 | ||
e23ccc0a PO |
1223 | /* |
1224 | * Will have to go up to b->length when API starts | |
1225 | * accepting variable number of planes. | |
61bd8fb3 HV |
1226 | * |
1227 | * If bytesused_is_used is false, then fall back to the | |
1228 | * full buffer size. In that case userspace clearly | |
1229 | * never bothered to set it and it's a safe assumption | |
1230 | * that they really meant to use the full plane sizes. | |
e23ccc0a PO |
1231 | */ |
1232 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
61bd8fb3 HV |
1233 | struct v4l2_plane *pdst = &v4l2_planes[plane]; |
1234 | struct v4l2_plane *psrc = &b->m.planes[plane]; | |
1235 | ||
1236 | pdst->bytesused = bytesused_is_used ? | |
1237 | psrc->bytesused : psrc->length; | |
1238 | pdst->data_offset = psrc->data_offset; | |
e23ccc0a PO |
1239 | } |
1240 | } | |
1241 | ||
1242 | if (b->memory == V4L2_MEMORY_USERPTR) { | |
1243 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
1244 | v4l2_planes[plane].m.userptr = | |
1245 | b->m.planes[plane].m.userptr; | |
1246 | v4l2_planes[plane].length = | |
1247 | b->m.planes[plane].length; | |
1248 | } | |
1249 | } | |
c5384048 SS |
1250 | if (b->memory == V4L2_MEMORY_DMABUF) { |
1251 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
1252 | v4l2_planes[plane].m.fd = | |
1253 | b->m.planes[plane].m.fd; | |
1254 | v4l2_planes[plane].length = | |
1255 | b->m.planes[plane].length; | |
c5384048 SS |
1256 | } |
1257 | } | |
e23ccc0a PO |
1258 | } else { |
1259 | /* | |
1260 | * Single-planar buffers do not use planes array, | |
1261 | * so fill in relevant v4l2_buffer struct fields instead. | |
1262 | * In videobuf we use our internal V4l2_planes struct for | |
1263 | * single-planar buffers as well, for simplicity. | |
61bd8fb3 HV |
1264 | * |
1265 | * If bytesused == 0, then fall back to the full buffer size | |
1266 | * as that's a sensible default. | |
e23ccc0a | 1267 | */ |
412376a1 | 1268 | if (V4L2_TYPE_IS_OUTPUT(b->type)) |
61bd8fb3 HV |
1269 | v4l2_planes[0].bytesused = |
1270 | b->bytesused ? b->bytesused : b->length; | |
1271 | else | |
1272 | v4l2_planes[0].bytesused = 0; | |
e23ccc0a PO |
1273 | |
1274 | if (b->memory == V4L2_MEMORY_USERPTR) { | |
1275 | v4l2_planes[0].m.userptr = b->m.userptr; | |
1276 | v4l2_planes[0].length = b->length; | |
1277 | } | |
c5384048 SS |
1278 | |
1279 | if (b->memory == V4L2_MEMORY_DMABUF) { | |
1280 | v4l2_planes[0].m.fd = b->m.fd; | |
1281 | v4l2_planes[0].length = b->length; | |
c5384048 | 1282 | } |
e23ccc0a PO |
1283 | } |
1284 | ||
f1343281 | 1285 | /* Zero flags that the vb2 core handles */ |
1b18e7a0 | 1286 | vb->v4l2_buf.flags = b->flags & ~V4L2_BUFFER_MASK_FLAGS; |
7ce6fd8f SA |
1287 | if ((vb->vb2_queue->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) != |
1288 | V4L2_BUF_FLAG_TIMESTAMP_COPY || !V4L2_TYPE_IS_OUTPUT(b->type)) { | |
1289 | /* | |
1290 | * Non-COPY timestamps and non-OUTPUT queues will get | |
1291 | * their timestamp and timestamp source flags from the | |
1292 | * queue. | |
1293 | */ | |
1294 | vb->v4l2_buf.flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK; | |
1295 | } | |
1296 | ||
f1343281 HV |
1297 | if (V4L2_TYPE_IS_OUTPUT(b->type)) { |
1298 | /* | |
1299 | * For output buffers mask out the timecode flag: | |
1300 | * this will be handled later in vb2_internal_qbuf(). | |
1301 | * The 'field' is valid metadata for this output buffer | |
1302 | * and so that needs to be copied here. | |
1303 | */ | |
1304 | vb->v4l2_buf.flags &= ~V4L2_BUF_FLAG_TIMECODE; | |
1305 | vb->v4l2_buf.field = b->field; | |
1306 | } else { | |
1307 | /* Zero any output buffer flags as this is a capture buffer */ | |
1308 | vb->v4l2_buf.flags &= ~V4L2_BUFFER_OUT_FLAGS; | |
1309 | } | |
e23ccc0a PO |
1310 | } |
1311 | ||
dcc2428a HV |
1312 | /** |
1313 | * __qbuf_mmap() - handle qbuf of an MMAP buffer | |
1314 | */ | |
1315 | static int __qbuf_mmap(struct vb2_buffer *vb, const struct v4l2_buffer *b) | |
1316 | { | |
1317 | __fill_vb2_buffer(vb, b, vb->v4l2_planes); | |
1318 | return call_vb_qop(vb, buf_prepare, vb); | |
1319 | } | |
1320 | ||
e23ccc0a PO |
1321 | /** |
1322 | * __qbuf_userptr() - handle qbuf of a USERPTR buffer | |
1323 | */ | |
2d86401c | 1324 | static int __qbuf_userptr(struct vb2_buffer *vb, const struct v4l2_buffer *b) |
e23ccc0a PO |
1325 | { |
1326 | struct v4l2_plane planes[VIDEO_MAX_PLANES]; | |
1327 | struct vb2_queue *q = vb->vb2_queue; | |
1328 | void *mem_priv; | |
1329 | unsigned int plane; | |
1330 | int ret; | |
1331 | int write = !V4L2_TYPE_IS_OUTPUT(q->type); | |
256f3162 | 1332 | bool reacquired = vb->planes[0].mem_priv == NULL; |
e23ccc0a | 1333 | |
412376a1 | 1334 | memset(planes, 0, sizeof(planes[0]) * vb->num_planes); |
32a77260 HV |
1335 | /* Copy relevant information provided by the userspace */ |
1336 | __fill_vb2_buffer(vb, b, planes); | |
e23ccc0a PO |
1337 | |
1338 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
1339 | /* Skip the plane if already verified */ | |
f0b7c7fc MS |
1340 | if (vb->v4l2_planes[plane].m.userptr && |
1341 | vb->v4l2_planes[plane].m.userptr == planes[plane].m.userptr | |
e23ccc0a PO |
1342 | && vb->v4l2_planes[plane].length == planes[plane].length) |
1343 | continue; | |
1344 | ||
fd4354cf | 1345 | dprintk(3, "userspace address for plane %d changed, " |
e23ccc0a PO |
1346 | "reacquiring memory\n", plane); |
1347 | ||
c1426bc7 MS |
1348 | /* Check if the provided plane buffer is large enough */ |
1349 | if (planes[plane].length < q->plane_sizes[plane]) { | |
fd4354cf | 1350 | dprintk(1, "provided buffer size %u is less than " |
2484a7e2 SWK |
1351 | "setup size %u for plane %d\n", |
1352 | planes[plane].length, | |
1353 | q->plane_sizes[plane], plane); | |
4c2625db | 1354 | ret = -EINVAL; |
c1426bc7 MS |
1355 | goto err; |
1356 | } | |
1357 | ||
e23ccc0a | 1358 | /* Release previously acquired memory if present */ |
256f3162 HV |
1359 | if (vb->planes[plane].mem_priv) { |
1360 | if (!reacquired) { | |
1361 | reacquired = true; | |
a1d36d8c | 1362 | call_void_vb_qop(vb, buf_cleanup, vb); |
256f3162 | 1363 | } |
a1d36d8c | 1364 | call_void_memop(vb, put_userptr, vb->planes[plane].mem_priv); |
256f3162 | 1365 | } |
e23ccc0a PO |
1366 | |
1367 | vb->planes[plane].mem_priv = NULL; | |
256f3162 | 1368 | memset(&vb->v4l2_planes[plane], 0, sizeof(struct v4l2_plane)); |
e23ccc0a PO |
1369 | |
1370 | /* Acquire each plane's memory */ | |
a1d36d8c | 1371 | mem_priv = call_ptr_memop(vb, get_userptr, q->alloc_ctx[plane], |
a00d0266 MS |
1372 | planes[plane].m.userptr, |
1373 | planes[plane].length, write); | |
1374 | if (IS_ERR_OR_NULL(mem_priv)) { | |
fd4354cf | 1375 | dprintk(1, "failed acquiring userspace " |
e23ccc0a | 1376 | "memory for plane %d\n", plane); |
a00d0266 MS |
1377 | ret = mem_priv ? PTR_ERR(mem_priv) : -EINVAL; |
1378 | goto err; | |
e23ccc0a | 1379 | } |
a00d0266 | 1380 | vb->planes[plane].mem_priv = mem_priv; |
e23ccc0a PO |
1381 | } |
1382 | ||
e23ccc0a PO |
1383 | /* |
1384 | * Now that everything is in order, copy relevant information | |
1385 | * provided by userspace. | |
1386 | */ | |
1387 | for (plane = 0; plane < vb->num_planes; ++plane) | |
1388 | vb->v4l2_planes[plane] = planes[plane]; | |
1389 | ||
256f3162 HV |
1390 | if (reacquired) { |
1391 | /* | |
1392 | * One or more planes changed, so we must call buf_init to do | |
1393 | * the driver-specific initialization on the newly acquired | |
1394 | * buffer, if provided. | |
1395 | */ | |
1396 | ret = call_vb_qop(vb, buf_init, vb); | |
1397 | if (ret) { | |
fd4354cf | 1398 | dprintk(1, "buffer initialization failed\n"); |
256f3162 HV |
1399 | goto err; |
1400 | } | |
1401 | } | |
1402 | ||
1403 | ret = call_vb_qop(vb, buf_prepare, vb); | |
1404 | if (ret) { | |
fd4354cf | 1405 | dprintk(1, "buffer preparation failed\n"); |
a1d36d8c | 1406 | call_void_vb_qop(vb, buf_cleanup, vb); |
256f3162 HV |
1407 | goto err; |
1408 | } | |
1409 | ||
e23ccc0a PO |
1410 | return 0; |
1411 | err: | |
1412 | /* In case of errors, release planes that were already acquired */ | |
c1426bc7 MS |
1413 | for (plane = 0; plane < vb->num_planes; ++plane) { |
1414 | if (vb->planes[plane].mem_priv) | |
a1d36d8c | 1415 | call_void_memop(vb, put_userptr, vb->planes[plane].mem_priv); |
c1426bc7 MS |
1416 | vb->planes[plane].mem_priv = NULL; |
1417 | vb->v4l2_planes[plane].m.userptr = 0; | |
1418 | vb->v4l2_planes[plane].length = 0; | |
e23ccc0a PO |
1419 | } |
1420 | ||
1421 | return ret; | |
1422 | } | |
1423 | ||
c5384048 SS |
1424 | /** |
1425 | * __qbuf_dmabuf() - handle qbuf of a DMABUF buffer | |
1426 | */ | |
1427 | static int __qbuf_dmabuf(struct vb2_buffer *vb, const struct v4l2_buffer *b) | |
1428 | { | |
1429 | struct v4l2_plane planes[VIDEO_MAX_PLANES]; | |
1430 | struct vb2_queue *q = vb->vb2_queue; | |
1431 | void *mem_priv; | |
1432 | unsigned int plane; | |
1433 | int ret; | |
1434 | int write = !V4L2_TYPE_IS_OUTPUT(q->type); | |
256f3162 | 1435 | bool reacquired = vb->planes[0].mem_priv == NULL; |
c5384048 | 1436 | |
412376a1 | 1437 | memset(planes, 0, sizeof(planes[0]) * vb->num_planes); |
6f546c5f | 1438 | /* Copy relevant information provided by the userspace */ |
c5384048 SS |
1439 | __fill_vb2_buffer(vb, b, planes); |
1440 | ||
1441 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
1442 | struct dma_buf *dbuf = dma_buf_get(planes[plane].m.fd); | |
1443 | ||
1444 | if (IS_ERR_OR_NULL(dbuf)) { | |
fd4354cf | 1445 | dprintk(1, "invalid dmabuf fd for plane %d\n", |
c5384048 SS |
1446 | plane); |
1447 | ret = -EINVAL; | |
1448 | goto err; | |
1449 | } | |
1450 | ||
1451 | /* use DMABUF size if length is not provided */ | |
1452 | if (planes[plane].length == 0) | |
1453 | planes[plane].length = dbuf->size; | |
1454 | ||
412376a1 | 1455 | if (planes[plane].length < q->plane_sizes[plane]) { |
fd4354cf | 1456 | dprintk(1, "invalid dmabuf length for plane %d\n", |
77c0782e | 1457 | plane); |
c5384048 SS |
1458 | ret = -EINVAL; |
1459 | goto err; | |
1460 | } | |
1461 | ||
1462 | /* Skip the plane if already verified */ | |
1463 | if (dbuf == vb->planes[plane].dbuf && | |
1464 | vb->v4l2_planes[plane].length == planes[plane].length) { | |
1465 | dma_buf_put(dbuf); | |
1466 | continue; | |
1467 | } | |
1468 | ||
fd4354cf | 1469 | dprintk(1, "buffer for plane %d changed\n", plane); |
c5384048 | 1470 | |
256f3162 HV |
1471 | if (!reacquired) { |
1472 | reacquired = true; | |
a1d36d8c | 1473 | call_void_vb_qop(vb, buf_cleanup, vb); |
256f3162 HV |
1474 | } |
1475 | ||
c5384048 | 1476 | /* Release previously acquired memory if present */ |
b5b4541e | 1477 | __vb2_plane_dmabuf_put(vb, &vb->planes[plane]); |
c5384048 SS |
1478 | memset(&vb->v4l2_planes[plane], 0, sizeof(struct v4l2_plane)); |
1479 | ||
1480 | /* Acquire each plane's memory */ | |
a1d36d8c | 1481 | mem_priv = call_ptr_memop(vb, attach_dmabuf, q->alloc_ctx[plane], |
c5384048 SS |
1482 | dbuf, planes[plane].length, write); |
1483 | if (IS_ERR(mem_priv)) { | |
fd4354cf | 1484 | dprintk(1, "failed to attach dmabuf\n"); |
c5384048 SS |
1485 | ret = PTR_ERR(mem_priv); |
1486 | dma_buf_put(dbuf); | |
1487 | goto err; | |
1488 | } | |
1489 | ||
1490 | vb->planes[plane].dbuf = dbuf; | |
1491 | vb->planes[plane].mem_priv = mem_priv; | |
1492 | } | |
1493 | ||
1494 | /* TODO: This pins the buffer(s) with dma_buf_map_attachment()).. but | |
1495 | * really we want to do this just before the DMA, not while queueing | |
1496 | * the buffer(s).. | |
1497 | */ | |
1498 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
b5b4541e | 1499 | ret = call_memop(vb, map_dmabuf, vb->planes[plane].mem_priv); |
c5384048 | 1500 | if (ret) { |
fd4354cf | 1501 | dprintk(1, "failed to map dmabuf for plane %d\n", |
c5384048 SS |
1502 | plane); |
1503 | goto err; | |
1504 | } | |
1505 | vb->planes[plane].dbuf_mapped = 1; | |
1506 | } | |
1507 | ||
c5384048 SS |
1508 | /* |
1509 | * Now that everything is in order, copy relevant information | |
1510 | * provided by userspace. | |
1511 | */ | |
1512 | for (plane = 0; plane < vb->num_planes; ++plane) | |
1513 | vb->v4l2_planes[plane] = planes[plane]; | |
1514 | ||
256f3162 HV |
1515 | if (reacquired) { |
1516 | /* | |
1517 | * Call driver-specific initialization on the newly acquired buffer, | |
1518 | * if provided. | |
1519 | */ | |
1520 | ret = call_vb_qop(vb, buf_init, vb); | |
1521 | if (ret) { | |
fd4354cf | 1522 | dprintk(1, "buffer initialization failed\n"); |
256f3162 HV |
1523 | goto err; |
1524 | } | |
1525 | } | |
1526 | ||
1527 | ret = call_vb_qop(vb, buf_prepare, vb); | |
1528 | if (ret) { | |
fd4354cf | 1529 | dprintk(1, "buffer preparation failed\n"); |
a1d36d8c | 1530 | call_void_vb_qop(vb, buf_cleanup, vb); |
256f3162 HV |
1531 | goto err; |
1532 | } | |
1533 | ||
c5384048 SS |
1534 | return 0; |
1535 | err: | |
1536 | /* In case of errors, release planes that were already acquired */ | |
1537 | __vb2_buf_dmabuf_put(vb); | |
1538 | ||
1539 | return ret; | |
1540 | } | |
1541 | ||
e23ccc0a PO |
1542 | /** |
1543 | * __enqueue_in_driver() - enqueue a vb2_buffer in driver for processing | |
1544 | */ | |
1545 | static void __enqueue_in_driver(struct vb2_buffer *vb) | |
1546 | { | |
1547 | struct vb2_queue *q = vb->vb2_queue; | |
3e0c2f20 | 1548 | unsigned int plane; |
e23ccc0a PO |
1549 | |
1550 | vb->state = VB2_BUF_STATE_ACTIVE; | |
6ea3b980 | 1551 | atomic_inc(&q->owned_by_drv_count); |
3e0c2f20 MS |
1552 | |
1553 | /* sync buffers */ | |
1554 | for (plane = 0; plane < vb->num_planes; ++plane) | |
a1d36d8c | 1555 | call_void_memop(vb, prepare, vb->planes[plane].mem_priv); |
3e0c2f20 | 1556 | |
a1d36d8c | 1557 | call_void_vb_qop(vb, buf_queue, vb); |
e23ccc0a PO |
1558 | } |
1559 | ||
2d86401c | 1560 | static int __buf_prepare(struct vb2_buffer *vb, const struct v4l2_buffer *b) |
ebc087d0 GL |
1561 | { |
1562 | struct vb2_queue *q = vb->vb2_queue; | |
b18a8ff2 | 1563 | struct rw_semaphore *mmap_sem; |
ebc087d0 GL |
1564 | int ret; |
1565 | ||
8023ed09 | 1566 | ret = __verify_length(vb, b); |
3a9621b0 | 1567 | if (ret < 0) { |
fd4354cf | 1568 | dprintk(1, "plane parameters verification failed: %d\n", ret); |
8023ed09 | 1569 | return ret; |
3a9621b0 | 1570 | } |
e35e41b5 HV |
1571 | if (b->field == V4L2_FIELD_ALTERNATE && V4L2_TYPE_IS_OUTPUT(q->type)) { |
1572 | /* | |
1573 | * If the format's field is ALTERNATE, then the buffer's field | |
1574 | * should be either TOP or BOTTOM, not ALTERNATE since that | |
1575 | * makes no sense. The driver has to know whether the | |
1576 | * buffer represents a top or a bottom field in order to | |
1577 | * program any DMA correctly. Using ALTERNATE is wrong, since | |
1578 | * that just says that it is either a top or a bottom field, | |
1579 | * but not which of the two it is. | |
1580 | */ | |
1581 | dprintk(1, "the field is incorrectly set to ALTERNATE for an output buffer\n"); | |
1582 | return -EINVAL; | |
1583 | } | |
8023ed09 | 1584 | |
b18a8ff2 | 1585 | vb->state = VB2_BUF_STATE_PREPARING; |
f1343281 HV |
1586 | vb->v4l2_buf.timestamp.tv_sec = 0; |
1587 | vb->v4l2_buf.timestamp.tv_usec = 0; | |
1588 | vb->v4l2_buf.sequence = 0; | |
1589 | ||
ebc087d0 GL |
1590 | switch (q->memory) { |
1591 | case V4L2_MEMORY_MMAP: | |
1592 | ret = __qbuf_mmap(vb, b); | |
1593 | break; | |
1594 | case V4L2_MEMORY_USERPTR: | |
b18a8ff2 | 1595 | /* |
f103b5d6 MCC |
1596 | * In case of user pointer buffers vb2 allocators need to get |
1597 | * direct access to userspace pages. This requires getting | |
1598 | * the mmap semaphore for read access in the current process | |
1599 | * structure. The same semaphore is taken before calling mmap | |
1600 | * operation, while both qbuf/prepare_buf and mmap are called | |
1601 | * by the driver or v4l2 core with the driver's lock held. | |
1602 | * To avoid an AB-BA deadlock (mmap_sem then driver's lock in | |
1603 | * mmap and driver's lock then mmap_sem in qbuf/prepare_buf), | |
1604 | * the videobuf2 core releases the driver's lock, takes | |
1605 | * mmap_sem and then takes the driver's lock again. | |
b18a8ff2 HV |
1606 | */ |
1607 | mmap_sem = ¤t->mm->mmap_sem; | |
a1d36d8c | 1608 | call_void_qop(q, wait_prepare, q); |
b18a8ff2 | 1609 | down_read(mmap_sem); |
a1d36d8c | 1610 | call_void_qop(q, wait_finish, q); |
b18a8ff2 | 1611 | |
ebc087d0 | 1612 | ret = __qbuf_userptr(vb, b); |
b18a8ff2 HV |
1613 | |
1614 | up_read(mmap_sem); | |
ebc087d0 | 1615 | break; |
c5384048 SS |
1616 | case V4L2_MEMORY_DMABUF: |
1617 | ret = __qbuf_dmabuf(vb, b); | |
1618 | break; | |
ebc087d0 GL |
1619 | default: |
1620 | WARN(1, "Invalid queue type\n"); | |
1621 | ret = -EINVAL; | |
1622 | } | |
1623 | ||
ebc087d0 | 1624 | if (ret) |
fd4354cf | 1625 | dprintk(1, "buffer preparation failed: %d\n", ret); |
b18a8ff2 | 1626 | vb->state = ret ? VB2_BUF_STATE_DEQUEUED : VB2_BUF_STATE_PREPARED; |
ebc087d0 GL |
1627 | |
1628 | return ret; | |
1629 | } | |
1630 | ||
012043b8 | 1631 | static int vb2_queue_or_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b, |
4138111a | 1632 | const char *opname) |
2d86401c | 1633 | { |
2d86401c | 1634 | if (b->type != q->type) { |
fd4354cf | 1635 | dprintk(1, "%s: invalid buffer type\n", opname); |
b18a8ff2 | 1636 | return -EINVAL; |
2d86401c GL |
1637 | } |
1638 | ||
1639 | if (b->index >= q->num_buffers) { | |
fd4354cf | 1640 | dprintk(1, "%s: buffer index out of range\n", opname); |
b18a8ff2 | 1641 | return -EINVAL; |
2d86401c GL |
1642 | } |
1643 | ||
4138111a | 1644 | if (q->bufs[b->index] == NULL) { |
2d86401c | 1645 | /* Should never happen */ |
fd4354cf | 1646 | dprintk(1, "%s: buffer is NULL\n", opname); |
b18a8ff2 | 1647 | return -EINVAL; |
2d86401c GL |
1648 | } |
1649 | ||
1650 | if (b->memory != q->memory) { | |
fd4354cf | 1651 | dprintk(1, "%s: invalid memory type\n", opname); |
b18a8ff2 | 1652 | return -EINVAL; |
2d86401c GL |
1653 | } |
1654 | ||
4138111a | 1655 | return __verify_planes_array(q->bufs[b->index], b); |
012043b8 | 1656 | } |
2d86401c | 1657 | |
e23ccc0a | 1658 | /** |
012043b8 | 1659 | * vb2_prepare_buf() - Pass ownership of a buffer from userspace to the kernel |
e23ccc0a | 1660 | * @q: videobuf2 queue |
012043b8 LP |
1661 | * @b: buffer structure passed from userspace to vidioc_prepare_buf |
1662 | * handler in driver | |
e23ccc0a | 1663 | * |
012043b8 | 1664 | * Should be called from vidioc_prepare_buf ioctl handler of a driver. |
e23ccc0a PO |
1665 | * This function: |
1666 | * 1) verifies the passed buffer, | |
012043b8 LP |
1667 | * 2) calls buf_prepare callback in the driver (if provided), in which |
1668 | * driver-specific buffer initialization can be performed, | |
e23ccc0a PO |
1669 | * |
1670 | * The return values from this function are intended to be directly returned | |
012043b8 | 1671 | * from vidioc_prepare_buf handler in driver. |
e23ccc0a | 1672 | */ |
012043b8 | 1673 | int vb2_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b) |
e23ccc0a | 1674 | { |
4138111a | 1675 | struct vb2_buffer *vb; |
b2f2f047 HV |
1676 | int ret; |
1677 | ||
74753cff | 1678 | if (vb2_fileio_is_active(q)) { |
fd4354cf | 1679 | dprintk(1, "file io in progress\n"); |
b2f2f047 HV |
1680 | return -EBUSY; |
1681 | } | |
4138111a | 1682 | |
b2f2f047 | 1683 | ret = vb2_queue_or_prepare_buf(q, b, "prepare_buf"); |
4138111a HV |
1684 | if (ret) |
1685 | return ret; | |
1686 | ||
1687 | vb = q->bufs[b->index]; | |
1688 | if (vb->state != VB2_BUF_STATE_DEQUEUED) { | |
fd4354cf | 1689 | dprintk(1, "invalid buffer state %d\n", |
4138111a HV |
1690 | vb->state); |
1691 | return -EINVAL; | |
1692 | } | |
1693 | ||
1694 | ret = __buf_prepare(vb, b); | |
1695 | if (!ret) { | |
1696 | /* Fill buffer information for the userspace */ | |
1697 | __fill_v4l2_buffer(vb, b); | |
1698 | ||
fd4354cf | 1699 | dprintk(1, "prepare of buffer %d succeeded\n", vb->v4l2_buf.index); |
4138111a HV |
1700 | } |
1701 | return ret; | |
012043b8 LP |
1702 | } |
1703 | EXPORT_SYMBOL_GPL(vb2_prepare_buf); | |
e23ccc0a | 1704 | |
02f142ec HV |
1705 | /** |
1706 | * vb2_start_streaming() - Attempt to start streaming. | |
1707 | * @q: videobuf2 queue | |
1708 | * | |
b3379c62 HV |
1709 | * Attempt to start streaming. When this function is called there must be |
1710 | * at least q->min_buffers_needed buffers queued up (i.e. the minimum | |
1711 | * number of buffers required for the DMA engine to function). If the | |
1712 | * @start_streaming op fails it is supposed to return all the driver-owned | |
1713 | * buffers back to vb2 in state QUEUED. Check if that happened and if | |
1714 | * not warn and reclaim them forcefully. | |
02f142ec HV |
1715 | */ |
1716 | static int vb2_start_streaming(struct vb2_queue *q) | |
1717 | { | |
b3379c62 | 1718 | struct vb2_buffer *vb; |
02f142ec HV |
1719 | int ret; |
1720 | ||
02f142ec | 1721 | /* |
b3379c62 HV |
1722 | * If any buffers were queued before streamon, |
1723 | * we can now pass them to driver for processing. | |
02f142ec | 1724 | */ |
b3379c62 HV |
1725 | list_for_each_entry(vb, &q->queued_list, queued_entry) |
1726 | __enqueue_in_driver(vb); | |
1727 | ||
1728 | /* Tell the driver to start streaming */ | |
1729 | ret = call_qop(q, start_streaming, q, | |
1730 | atomic_read(&q->owned_by_drv_count)); | |
1731 | q->start_streaming_called = ret == 0; | |
1732 | if (!ret) | |
02f142ec | 1733 | return 0; |
b3379c62 | 1734 | |
fd4354cf | 1735 | dprintk(1, "driver refused to start streaming\n"); |
b3379c62 HV |
1736 | if (WARN_ON(atomic_read(&q->owned_by_drv_count))) { |
1737 | unsigned i; | |
1738 | ||
1739 | /* | |
1740 | * Forcefully reclaim buffers if the driver did not | |
1741 | * correctly return them to vb2. | |
1742 | */ | |
1743 | for (i = 0; i < q->num_buffers; ++i) { | |
1744 | vb = q->bufs[i]; | |
1745 | if (vb->state == VB2_BUF_STATE_ACTIVE) | |
1746 | vb2_buffer_done(vb, VB2_BUF_STATE_QUEUED); | |
1747 | } | |
1748 | /* Must be zero now */ | |
1749 | WARN_ON(atomic_read(&q->owned_by_drv_count)); | |
02f142ec | 1750 | } |
02f142ec HV |
1751 | return ret; |
1752 | } | |
1753 | ||
b2f2f047 | 1754 | static int vb2_internal_qbuf(struct vb2_queue *q, struct v4l2_buffer *b) |
012043b8 | 1755 | { |
4138111a HV |
1756 | int ret = vb2_queue_or_prepare_buf(q, b, "qbuf"); |
1757 | struct vb2_buffer *vb; | |
1758 | ||
1759 | if (ret) | |
1760 | return ret; | |
1761 | ||
1762 | vb = q->bufs[b->index]; | |
e23ccc0a | 1763 | |
ebc087d0 GL |
1764 | switch (vb->state) { |
1765 | case VB2_BUF_STATE_DEQUEUED: | |
1766 | ret = __buf_prepare(vb, b); | |
1767 | if (ret) | |
012043b8 | 1768 | return ret; |
4138111a | 1769 | break; |
ebc087d0 GL |
1770 | case VB2_BUF_STATE_PREPARED: |
1771 | break; | |
b18a8ff2 | 1772 | case VB2_BUF_STATE_PREPARING: |
fd4354cf | 1773 | dprintk(1, "buffer still being prepared\n"); |
b18a8ff2 | 1774 | return -EINVAL; |
ebc087d0 | 1775 | default: |
fd4354cf | 1776 | dprintk(1, "invalid buffer state %d\n", vb->state); |
012043b8 | 1777 | return -EINVAL; |
e23ccc0a PO |
1778 | } |
1779 | ||
e23ccc0a PO |
1780 | /* |
1781 | * Add to the queued buffers list, a buffer will stay on it until | |
1782 | * dequeued in dqbuf. | |
1783 | */ | |
1784 | list_add_tail(&vb->queued_entry, &q->queued_list); | |
b3379c62 | 1785 | q->queued_count++; |
e23ccc0a | 1786 | vb->state = VB2_BUF_STATE_QUEUED; |
f1343281 HV |
1787 | if (V4L2_TYPE_IS_OUTPUT(q->type)) { |
1788 | /* | |
1789 | * For output buffers copy the timestamp if needed, | |
1790 | * and the timecode field and flag if needed. | |
1791 | */ | |
c57ff792 SA |
1792 | if ((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == |
1793 | V4L2_BUF_FLAG_TIMESTAMP_COPY) | |
f1343281 HV |
1794 | vb->v4l2_buf.timestamp = b->timestamp; |
1795 | vb->v4l2_buf.flags |= b->flags & V4L2_BUF_FLAG_TIMECODE; | |
1796 | if (b->flags & V4L2_BUF_FLAG_TIMECODE) | |
1797 | vb->v4l2_buf.timecode = b->timecode; | |
1798 | } | |
e23ccc0a PO |
1799 | |
1800 | /* | |
1801 | * If already streaming, give the buffer to driver for processing. | |
1802 | * If not, the buffer will be given to driver on next streamon. | |
1803 | */ | |
b3379c62 | 1804 | if (q->start_streaming_called) |
e23ccc0a PO |
1805 | __enqueue_in_driver(vb); |
1806 | ||
4138111a HV |
1807 | /* Fill buffer information for the userspace */ |
1808 | __fill_v4l2_buffer(vb, b); | |
21db3e07 | 1809 | |
b3379c62 HV |
1810 | /* |
1811 | * If streamon has been called, and we haven't yet called | |
1812 | * start_streaming() since not enough buffers were queued, and | |
1813 | * we now have reached the minimum number of queued buffers, | |
1814 | * then we can finally call start_streaming(). | |
1815 | */ | |
1816 | if (q->streaming && !q->start_streaming_called && | |
1817 | q->queued_count >= q->min_buffers_needed) { | |
02f142ec HV |
1818 | ret = vb2_start_streaming(q); |
1819 | if (ret) | |
1820 | return ret; | |
1821 | } | |
1822 | ||
fd4354cf | 1823 | dprintk(1, "qbuf of buffer %d succeeded\n", vb->v4l2_buf.index); |
4138111a | 1824 | return 0; |
e23ccc0a | 1825 | } |
b2f2f047 HV |
1826 | |
1827 | /** | |
1828 | * vb2_qbuf() - Queue a buffer from userspace | |
1829 | * @q: videobuf2 queue | |
1830 | * @b: buffer structure passed from userspace to vidioc_qbuf handler | |
1831 | * in driver | |
1832 | * | |
1833 | * Should be called from vidioc_qbuf ioctl handler of a driver. | |
1834 | * This function: | |
1835 | * 1) verifies the passed buffer, | |
1836 | * 2) if necessary, calls buf_prepare callback in the driver (if provided), in | |
1837 | * which driver-specific buffer initialization can be performed, | |
1838 | * 3) if streaming is on, queues the buffer in driver by the means of buf_queue | |
1839 | * callback for processing. | |
1840 | * | |
1841 | * The return values from this function are intended to be directly returned | |
1842 | * from vidioc_qbuf handler in driver. | |
1843 | */ | |
1844 | int vb2_qbuf(struct vb2_queue *q, struct v4l2_buffer *b) | |
1845 | { | |
74753cff | 1846 | if (vb2_fileio_is_active(q)) { |
fd4354cf | 1847 | dprintk(1, "file io in progress\n"); |
b2f2f047 HV |
1848 | return -EBUSY; |
1849 | } | |
1850 | ||
1851 | return vb2_internal_qbuf(q, b); | |
1852 | } | |
e23ccc0a PO |
1853 | EXPORT_SYMBOL_GPL(vb2_qbuf); |
1854 | ||
1855 | /** | |
1856 | * __vb2_wait_for_done_vb() - wait for a buffer to become available | |
1857 | * for dequeuing | |
1858 | * | |
1859 | * Will sleep if required for nonblocking == false. | |
1860 | */ | |
1861 | static int __vb2_wait_for_done_vb(struct vb2_queue *q, int nonblocking) | |
1862 | { | |
1863 | /* | |
1864 | * All operations on vb_done_list are performed under done_lock | |
1865 | * spinlock protection. However, buffers may be removed from | |
1866 | * it and returned to userspace only while holding both driver's | |
1867 | * lock and the done_lock spinlock. Thus we can be sure that as | |
1868 | * long as we hold the driver's lock, the list will remain not | |
1869 | * empty if list_empty() check succeeds. | |
1870 | */ | |
1871 | ||
1872 | for (;;) { | |
1873 | int ret; | |
1874 | ||
1875 | if (!q->streaming) { | |
3050040b | 1876 | dprintk(1, "streaming off, will not wait for buffers\n"); |
e23ccc0a PO |
1877 | return -EINVAL; |
1878 | } | |
1879 | ||
1880 | if (!list_empty(&q->done_list)) { | |
1881 | /* | |
1882 | * Found a buffer that we were waiting for. | |
1883 | */ | |
1884 | break; | |
1885 | } | |
1886 | ||
1887 | if (nonblocking) { | |
3050040b | 1888 | dprintk(1, "nonblocking and no buffers to dequeue, " |
e23ccc0a PO |
1889 | "will not wait\n"); |
1890 | return -EAGAIN; | |
1891 | } | |
1892 | ||
1893 | /* | |
1894 | * We are streaming and blocking, wait for another buffer to | |
1895 | * become ready or for streamoff. Driver's lock is released to | |
1896 | * allow streamoff or qbuf to be called while waiting. | |
1897 | */ | |
a1d36d8c | 1898 | call_void_qop(q, wait_prepare, q); |
e23ccc0a PO |
1899 | |
1900 | /* | |
1901 | * All locks have been released, it is safe to sleep now. | |
1902 | */ | |
3050040b | 1903 | dprintk(3, "will sleep waiting for buffers\n"); |
e23ccc0a PO |
1904 | ret = wait_event_interruptible(q->done_wq, |
1905 | !list_empty(&q->done_list) || !q->streaming); | |
1906 | ||
1907 | /* | |
1908 | * We need to reevaluate both conditions again after reacquiring | |
1909 | * the locks or return an error if one occurred. | |
1910 | */ | |
a1d36d8c | 1911 | call_void_qop(q, wait_finish, q); |
32a77260 | 1912 | if (ret) { |
3050040b | 1913 | dprintk(1, "sleep was interrupted\n"); |
e23ccc0a | 1914 | return ret; |
32a77260 | 1915 | } |
e23ccc0a PO |
1916 | } |
1917 | return 0; | |
1918 | } | |
1919 | ||
1920 | /** | |
1921 | * __vb2_get_done_vb() - get a buffer ready for dequeuing | |
1922 | * | |
1923 | * Will sleep if required for nonblocking == false. | |
1924 | */ | |
1925 | static int __vb2_get_done_vb(struct vb2_queue *q, struct vb2_buffer **vb, | |
32a77260 | 1926 | struct v4l2_buffer *b, int nonblocking) |
e23ccc0a PO |
1927 | { |
1928 | unsigned long flags; | |
1929 | int ret; | |
1930 | ||
1931 | /* | |
1932 | * Wait for at least one buffer to become available on the done_list. | |
1933 | */ | |
1934 | ret = __vb2_wait_for_done_vb(q, nonblocking); | |
1935 | if (ret) | |
1936 | return ret; | |
1937 | ||
1938 | /* | |
1939 | * Driver's lock has been held since we last verified that done_list | |
1940 | * is not empty, so no need for another list_empty(done_list) check. | |
1941 | */ | |
1942 | spin_lock_irqsave(&q->done_lock, flags); | |
1943 | *vb = list_first_entry(&q->done_list, struct vb2_buffer, done_entry); | |
32a77260 HV |
1944 | /* |
1945 | * Only remove the buffer from done_list if v4l2_buffer can handle all | |
1946 | * the planes. | |
1947 | */ | |
1948 | ret = __verify_planes_array(*vb, b); | |
1949 | if (!ret) | |
1950 | list_del(&(*vb)->done_entry); | |
e23ccc0a PO |
1951 | spin_unlock_irqrestore(&q->done_lock, flags); |
1952 | ||
32a77260 | 1953 | return ret; |
e23ccc0a PO |
1954 | } |
1955 | ||
1956 | /** | |
1957 | * vb2_wait_for_all_buffers() - wait until all buffers are given back to vb2 | |
1958 | * @q: videobuf2 queue | |
1959 | * | |
1960 | * This function will wait until all buffers that have been given to the driver | |
1961 | * by buf_queue() are given back to vb2 with vb2_buffer_done(). It doesn't call | |
1962 | * wait_prepare, wait_finish pair. It is intended to be called with all locks | |
1963 | * taken, for example from stop_streaming() callback. | |
1964 | */ | |
1965 | int vb2_wait_for_all_buffers(struct vb2_queue *q) | |
1966 | { | |
1967 | if (!q->streaming) { | |
3050040b | 1968 | dprintk(1, "streaming off, will not wait for buffers\n"); |
e23ccc0a PO |
1969 | return -EINVAL; |
1970 | } | |
1971 | ||
b3379c62 | 1972 | if (q->start_streaming_called) |
6ea3b980 | 1973 | wait_event(q->done_wq, !atomic_read(&q->owned_by_drv_count)); |
e23ccc0a PO |
1974 | return 0; |
1975 | } | |
1976 | EXPORT_SYMBOL_GPL(vb2_wait_for_all_buffers); | |
1977 | ||
c5384048 SS |
1978 | /** |
1979 | * __vb2_dqbuf() - bring back the buffer to the DEQUEUED state | |
1980 | */ | |
1981 | static void __vb2_dqbuf(struct vb2_buffer *vb) | |
1982 | { | |
1983 | struct vb2_queue *q = vb->vb2_queue; | |
1984 | unsigned int i; | |
1985 | ||
1986 | /* nothing to do if the buffer is already dequeued */ | |
1987 | if (vb->state == VB2_BUF_STATE_DEQUEUED) | |
1988 | return; | |
1989 | ||
1990 | vb->state = VB2_BUF_STATE_DEQUEUED; | |
1991 | ||
1992 | /* unmap DMABUF buffer */ | |
1993 | if (q->memory == V4L2_MEMORY_DMABUF) | |
1994 | for (i = 0; i < vb->num_planes; ++i) { | |
1995 | if (!vb->planes[i].dbuf_mapped) | |
1996 | continue; | |
a1d36d8c | 1997 | call_void_memop(vb, unmap_dmabuf, vb->planes[i].mem_priv); |
c5384048 SS |
1998 | vb->planes[i].dbuf_mapped = 0; |
1999 | } | |
2000 | } | |
2001 | ||
b2f2f047 | 2002 | static int vb2_internal_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking) |
e23ccc0a PO |
2003 | { |
2004 | struct vb2_buffer *vb = NULL; | |
2005 | int ret; | |
2006 | ||
2007 | if (b->type != q->type) { | |
fd4354cf | 2008 | dprintk(1, "invalid buffer type\n"); |
e23ccc0a PO |
2009 | return -EINVAL; |
2010 | } | |
32a77260 HV |
2011 | ret = __vb2_get_done_vb(q, &vb, b, nonblocking); |
2012 | if (ret < 0) | |
e23ccc0a | 2013 | return ret; |
e23ccc0a | 2014 | |
e23ccc0a PO |
2015 | switch (vb->state) { |
2016 | case VB2_BUF_STATE_DONE: | |
3050040b | 2017 | dprintk(3, "returning done buffer\n"); |
e23ccc0a PO |
2018 | break; |
2019 | case VB2_BUF_STATE_ERROR: | |
3050040b | 2020 | dprintk(3, "returning done buffer with errors\n"); |
e23ccc0a PO |
2021 | break; |
2022 | default: | |
3050040b | 2023 | dprintk(1, "invalid buffer state\n"); |
e23ccc0a PO |
2024 | return -EINVAL; |
2025 | } | |
2026 | ||
a1d36d8c | 2027 | call_void_vb_qop(vb, buf_finish, vb); |
9cf3c31a | 2028 | |
e23ccc0a PO |
2029 | /* Fill buffer information for the userspace */ |
2030 | __fill_v4l2_buffer(vb, b); | |
2031 | /* Remove from videobuf queue */ | |
2032 | list_del(&vb->queued_entry); | |
b3379c62 | 2033 | q->queued_count--; |
c5384048 SS |
2034 | /* go back to dequeued state */ |
2035 | __vb2_dqbuf(vb); | |
e23ccc0a PO |
2036 | |
2037 | dprintk(1, "dqbuf of buffer %d, with state %d\n", | |
2038 | vb->v4l2_buf.index, vb->state); | |
2039 | ||
e23ccc0a PO |
2040 | return 0; |
2041 | } | |
b2f2f047 HV |
2042 | |
2043 | /** | |
2044 | * vb2_dqbuf() - Dequeue a buffer to the userspace | |
2045 | * @q: videobuf2 queue | |
2046 | * @b: buffer structure passed from userspace to vidioc_dqbuf handler | |
2047 | * in driver | |
2048 | * @nonblocking: if true, this call will not sleep waiting for a buffer if no | |
2049 | * buffers ready for dequeuing are present. Normally the driver | |
2050 | * would be passing (file->f_flags & O_NONBLOCK) here | |
2051 | * | |
2052 | * Should be called from vidioc_dqbuf ioctl handler of a driver. | |
2053 | * This function: | |
2054 | * 1) verifies the passed buffer, | |
2055 | * 2) calls buf_finish callback in the driver (if provided), in which | |
2056 | * driver can perform any additional operations that may be required before | |
2057 | * returning the buffer to userspace, such as cache sync, | |
2058 | * 3) the buffer struct members are filled with relevant information for | |
2059 | * the userspace. | |
2060 | * | |
2061 | * The return values from this function are intended to be directly returned | |
2062 | * from vidioc_dqbuf handler in driver. | |
2063 | */ | |
2064 | int vb2_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking) | |
2065 | { | |
74753cff | 2066 | if (vb2_fileio_is_active(q)) { |
fd4354cf | 2067 | dprintk(1, "file io in progress\n"); |
b2f2f047 HV |
2068 | return -EBUSY; |
2069 | } | |
2070 | return vb2_internal_dqbuf(q, b, nonblocking); | |
2071 | } | |
e23ccc0a PO |
2072 | EXPORT_SYMBOL_GPL(vb2_dqbuf); |
2073 | ||
bd323e28 MS |
2074 | /** |
2075 | * __vb2_queue_cancel() - cancel and stop (pause) streaming | |
2076 | * | |
2077 | * Removes all queued buffers from driver's queue and all buffers queued by | |
2078 | * userspace from videobuf's queue. Returns to state after reqbufs. | |
2079 | */ | |
2080 | static void __vb2_queue_cancel(struct vb2_queue *q) | |
2081 | { | |
2082 | unsigned int i; | |
2083 | ||
2084 | /* | |
2085 | * Tell driver to stop all transactions and release all queued | |
2086 | * buffers. | |
2087 | */ | |
b3379c62 | 2088 | if (q->start_streaming_called) |
e37559b2 | 2089 | call_void_qop(q, stop_streaming, q); |
b3379c62 HV |
2090 | |
2091 | if (WARN_ON(atomic_read(&q->owned_by_drv_count))) { | |
2092 | for (i = 0; i < q->num_buffers; ++i) | |
2093 | if (q->bufs[i]->state == VB2_BUF_STATE_ACTIVE) | |
2094 | vb2_buffer_done(q->bufs[i], VB2_BUF_STATE_ERROR); | |
2095 | /* Must be zero now */ | |
2096 | WARN_ON(atomic_read(&q->owned_by_drv_count)); | |
2097 | } | |
bd323e28 | 2098 | |
b646f0b7 LP |
2099 | q->streaming = 0; |
2100 | q->start_streaming_called = 0; | |
2101 | q->queued_count = 0; | |
2102 | ||
bd323e28 MS |
2103 | /* |
2104 | * Remove all buffers from videobuf's list... | |
2105 | */ | |
2106 | INIT_LIST_HEAD(&q->queued_list); | |
2107 | /* | |
2108 | * ...and done list; userspace will not receive any buffers it | |
2109 | * has not already dequeued before initiating cancel. | |
2110 | */ | |
2111 | INIT_LIST_HEAD(&q->done_list); | |
6ea3b980 | 2112 | atomic_set(&q->owned_by_drv_count, 0); |
bd323e28 MS |
2113 | wake_up_all(&q->done_wq); |
2114 | ||
2115 | /* | |
2116 | * Reinitialize all buffers for next use. | |
9c0863b1 HV |
2117 | * Make sure to call buf_finish for any queued buffers. Normally |
2118 | * that's done in dqbuf, but that's not going to happen when we | |
2119 | * cancel the whole queue. Note: this code belongs here, not in | |
2120 | * __vb2_dqbuf() since in vb2_internal_dqbuf() there is a critical | |
2121 | * call to __fill_v4l2_buffer() after buf_finish(). That order can't | |
2122 | * be changed, so we can't move the buf_finish() to __vb2_dqbuf(). | |
bd323e28 | 2123 | */ |
9c0863b1 HV |
2124 | for (i = 0; i < q->num_buffers; ++i) { |
2125 | struct vb2_buffer *vb = q->bufs[i]; | |
2126 | ||
2127 | if (vb->state != VB2_BUF_STATE_DEQUEUED) { | |
2128 | vb->state = VB2_BUF_STATE_PREPARED; | |
a1d36d8c | 2129 | call_void_vb_qop(vb, buf_finish, vb); |
9c0863b1 HV |
2130 | } |
2131 | __vb2_dqbuf(vb); | |
2132 | } | |
bd323e28 MS |
2133 | } |
2134 | ||
b2f2f047 | 2135 | static int vb2_internal_streamon(struct vb2_queue *q, enum v4l2_buf_type type) |
e23ccc0a | 2136 | { |
5db2c3ba | 2137 | int ret; |
e23ccc0a PO |
2138 | |
2139 | if (type != q->type) { | |
fd4354cf | 2140 | dprintk(1, "invalid stream type\n"); |
e23ccc0a PO |
2141 | return -EINVAL; |
2142 | } | |
2143 | ||
2144 | if (q->streaming) { | |
fd4354cf | 2145 | dprintk(3, "already streaming\n"); |
f956035c | 2146 | return 0; |
e23ccc0a PO |
2147 | } |
2148 | ||
548df783 | 2149 | if (!q->num_buffers) { |
fd4354cf | 2150 | dprintk(1, "no buffers have been allocated\n"); |
548df783 RR |
2151 | return -EINVAL; |
2152 | } | |
2153 | ||
b3379c62 | 2154 | if (q->num_buffers < q->min_buffers_needed) { |
fd4354cf | 2155 | dprintk(1, "need at least %u allocated buffers\n", |
b3379c62 HV |
2156 | q->min_buffers_needed); |
2157 | return -EINVAL; | |
2158 | } | |
249f5a58 | 2159 | |
e23ccc0a | 2160 | /* |
b3379c62 HV |
2161 | * Tell driver to start streaming provided sufficient buffers |
2162 | * are available. | |
e23ccc0a | 2163 | */ |
b3379c62 HV |
2164 | if (q->queued_count >= q->min_buffers_needed) { |
2165 | ret = vb2_start_streaming(q); | |
2166 | if (ret) { | |
2167 | __vb2_queue_cancel(q); | |
2168 | return ret; | |
2169 | } | |
5db2c3ba PO |
2170 | } |
2171 | ||
2172 | q->streaming = 1; | |
e23ccc0a | 2173 | |
fd4354cf | 2174 | dprintk(3, "successful\n"); |
e23ccc0a PO |
2175 | return 0; |
2176 | } | |
e23ccc0a PO |
2177 | |
2178 | /** | |
b2f2f047 | 2179 | * vb2_streamon - start streaming |
e23ccc0a | 2180 | * @q: videobuf2 queue |
b2f2f047 | 2181 | * @type: type argument passed from userspace to vidioc_streamon handler |
e23ccc0a | 2182 | * |
b2f2f047 | 2183 | * Should be called from vidioc_streamon handler of a driver. |
e23ccc0a | 2184 | * This function: |
b2f2f047 HV |
2185 | * 1) verifies current state |
2186 | * 2) passes any previously queued buffers to the driver and starts streaming | |
e23ccc0a | 2187 | * |
e23ccc0a | 2188 | * The return values from this function are intended to be directly returned |
b2f2f047 | 2189 | * from vidioc_streamon handler in the driver. |
e23ccc0a | 2190 | */ |
b2f2f047 | 2191 | int vb2_streamon(struct vb2_queue *q, enum v4l2_buf_type type) |
e23ccc0a | 2192 | { |
74753cff | 2193 | if (vb2_fileio_is_active(q)) { |
fd4354cf | 2194 | dprintk(1, "file io in progress\n"); |
b25748fe MS |
2195 | return -EBUSY; |
2196 | } | |
b2f2f047 HV |
2197 | return vb2_internal_streamon(q, type); |
2198 | } | |
2199 | EXPORT_SYMBOL_GPL(vb2_streamon); | |
b25748fe | 2200 | |
b2f2f047 HV |
2201 | static int vb2_internal_streamoff(struct vb2_queue *q, enum v4l2_buf_type type) |
2202 | { | |
e23ccc0a | 2203 | if (type != q->type) { |
fd4354cf | 2204 | dprintk(1, "invalid stream type\n"); |
e23ccc0a PO |
2205 | return -EINVAL; |
2206 | } | |
2207 | ||
e23ccc0a PO |
2208 | /* |
2209 | * Cancel will pause streaming and remove all buffers from the driver | |
2210 | * and videobuf, effectively returning control over them to userspace. | |
3f1a9a33 HV |
2211 | * |
2212 | * Note that we do this even if q->streaming == 0: if you prepare or | |
2213 | * queue buffers, and then call streamoff without ever having called | |
2214 | * streamon, you would still expect those buffers to be returned to | |
2215 | * their normal dequeued state. | |
e23ccc0a PO |
2216 | */ |
2217 | __vb2_queue_cancel(q); | |
2218 | ||
fd4354cf | 2219 | dprintk(3, "successful\n"); |
e23ccc0a PO |
2220 | return 0; |
2221 | } | |
b2f2f047 HV |
2222 | |
2223 | /** | |
2224 | * vb2_streamoff - stop streaming | |
2225 | * @q: videobuf2 queue | |
2226 | * @type: type argument passed from userspace to vidioc_streamoff handler | |
2227 | * | |
2228 | * Should be called from vidioc_streamoff handler of a driver. | |
2229 | * This function: | |
2230 | * 1) verifies current state, | |
2231 | * 2) stop streaming and dequeues any queued buffers, including those previously | |
2232 | * passed to the driver (after waiting for the driver to finish). | |
2233 | * | |
2234 | * This call can be used for pausing playback. | |
2235 | * The return values from this function are intended to be directly returned | |
2236 | * from vidioc_streamoff handler in the driver | |
2237 | */ | |
2238 | int vb2_streamoff(struct vb2_queue *q, enum v4l2_buf_type type) | |
2239 | { | |
74753cff | 2240 | if (vb2_fileio_is_active(q)) { |
fd4354cf | 2241 | dprintk(1, "file io in progress\n"); |
b2f2f047 HV |
2242 | return -EBUSY; |
2243 | } | |
2244 | return vb2_internal_streamoff(q, type); | |
2245 | } | |
e23ccc0a PO |
2246 | EXPORT_SYMBOL_GPL(vb2_streamoff); |
2247 | ||
2248 | /** | |
2249 | * __find_plane_by_offset() - find plane associated with the given offset off | |
2250 | */ | |
2251 | static int __find_plane_by_offset(struct vb2_queue *q, unsigned long off, | |
2252 | unsigned int *_buffer, unsigned int *_plane) | |
2253 | { | |
2254 | struct vb2_buffer *vb; | |
2255 | unsigned int buffer, plane; | |
2256 | ||
2257 | /* | |
2258 | * Go over all buffers and their planes, comparing the given offset | |
2259 | * with an offset assigned to each plane. If a match is found, | |
2260 | * return its buffer and plane numbers. | |
2261 | */ | |
2262 | for (buffer = 0; buffer < q->num_buffers; ++buffer) { | |
2263 | vb = q->bufs[buffer]; | |
2264 | ||
2265 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
2266 | if (vb->v4l2_planes[plane].m.mem_offset == off) { | |
2267 | *_buffer = buffer; | |
2268 | *_plane = plane; | |
2269 | return 0; | |
2270 | } | |
2271 | } | |
2272 | } | |
2273 | ||
2274 | return -EINVAL; | |
2275 | } | |
2276 | ||
83ae7c5a TS |
2277 | /** |
2278 | * vb2_expbuf() - Export a buffer as a file descriptor | |
2279 | * @q: videobuf2 queue | |
2280 | * @eb: export buffer structure passed from userspace to vidioc_expbuf | |
2281 | * handler in driver | |
2282 | * | |
2283 | * The return values from this function are intended to be directly returned | |
2284 | * from vidioc_expbuf handler in driver. | |
2285 | */ | |
2286 | int vb2_expbuf(struct vb2_queue *q, struct v4l2_exportbuffer *eb) | |
2287 | { | |
2288 | struct vb2_buffer *vb = NULL; | |
2289 | struct vb2_plane *vb_plane; | |
2290 | int ret; | |
2291 | struct dma_buf *dbuf; | |
2292 | ||
2293 | if (q->memory != V4L2_MEMORY_MMAP) { | |
3050040b | 2294 | dprintk(1, "queue is not currently set up for mmap\n"); |
83ae7c5a TS |
2295 | return -EINVAL; |
2296 | } | |
2297 | ||
2298 | if (!q->mem_ops->get_dmabuf) { | |
3050040b | 2299 | dprintk(1, "queue does not support DMA buffer exporting\n"); |
83ae7c5a TS |
2300 | return -EINVAL; |
2301 | } | |
2302 | ||
ea3aba84 | 2303 | if (eb->flags & ~(O_CLOEXEC | O_ACCMODE)) { |
3050040b | 2304 | dprintk(1, "queue does support only O_CLOEXEC and access mode flags\n"); |
83ae7c5a TS |
2305 | return -EINVAL; |
2306 | } | |
2307 | ||
2308 | if (eb->type != q->type) { | |
fd4354cf | 2309 | dprintk(1, "invalid buffer type\n"); |
83ae7c5a TS |
2310 | return -EINVAL; |
2311 | } | |
2312 | ||
2313 | if (eb->index >= q->num_buffers) { | |
2314 | dprintk(1, "buffer index out of range\n"); | |
2315 | return -EINVAL; | |
2316 | } | |
2317 | ||
2318 | vb = q->bufs[eb->index]; | |
2319 | ||
2320 | if (eb->plane >= vb->num_planes) { | |
2321 | dprintk(1, "buffer plane out of range\n"); | |
2322 | return -EINVAL; | |
2323 | } | |
2324 | ||
74753cff HV |
2325 | if (vb2_fileio_is_active(q)) { |
2326 | dprintk(1, "expbuf: file io in progress\n"); | |
2327 | return -EBUSY; | |
2328 | } | |
2329 | ||
83ae7c5a TS |
2330 | vb_plane = &vb->planes[eb->plane]; |
2331 | ||
a1d36d8c | 2332 | dbuf = call_ptr_memop(vb, get_dmabuf, vb_plane->mem_priv, eb->flags & O_ACCMODE); |
83ae7c5a | 2333 | if (IS_ERR_OR_NULL(dbuf)) { |
3050040b | 2334 | dprintk(1, "failed to export buffer %d, plane %d\n", |
83ae7c5a TS |
2335 | eb->index, eb->plane); |
2336 | return -EINVAL; | |
2337 | } | |
2338 | ||
ea3aba84 | 2339 | ret = dma_buf_fd(dbuf, eb->flags & ~O_ACCMODE); |
83ae7c5a TS |
2340 | if (ret < 0) { |
2341 | dprintk(3, "buffer %d, plane %d failed to export (%d)\n", | |
2342 | eb->index, eb->plane, ret); | |
2343 | dma_buf_put(dbuf); | |
2344 | return ret; | |
2345 | } | |
2346 | ||
2347 | dprintk(3, "buffer %d, plane %d exported as %d descriptor\n", | |
2348 | eb->index, eb->plane, ret); | |
2349 | eb->fd = ret; | |
2350 | ||
2351 | return 0; | |
2352 | } | |
2353 | EXPORT_SYMBOL_GPL(vb2_expbuf); | |
2354 | ||
e23ccc0a PO |
2355 | /** |
2356 | * vb2_mmap() - map video buffers into application address space | |
2357 | * @q: videobuf2 queue | |
2358 | * @vma: vma passed to the mmap file operation handler in the driver | |
2359 | * | |
2360 | * Should be called from mmap file operation handler of a driver. | |
2361 | * This function maps one plane of one of the available video buffers to | |
2362 | * userspace. To map whole video memory allocated on reqbufs, this function | |
2363 | * has to be called once per each plane per each buffer previously allocated. | |
2364 | * | |
2365 | * When the userspace application calls mmap, it passes to it an offset returned | |
2366 | * to it earlier by the means of vidioc_querybuf handler. That offset acts as | |
2367 | * a "cookie", which is then used to identify the plane to be mapped. | |
2368 | * This function finds a plane with a matching offset and a mapping is performed | |
2369 | * by the means of a provided memory operation. | |
2370 | * | |
2371 | * The return values from this function are intended to be directly returned | |
2372 | * from the mmap handler in driver. | |
2373 | */ | |
2374 | int vb2_mmap(struct vb2_queue *q, struct vm_area_struct *vma) | |
2375 | { | |
2376 | unsigned long off = vma->vm_pgoff << PAGE_SHIFT; | |
e23ccc0a | 2377 | struct vb2_buffer *vb; |
ce9c2244 | 2378 | unsigned int buffer = 0, plane = 0; |
e23ccc0a | 2379 | int ret; |
7f841459 | 2380 | unsigned long length; |
e23ccc0a PO |
2381 | |
2382 | if (q->memory != V4L2_MEMORY_MMAP) { | |
3050040b | 2383 | dprintk(1, "queue is not currently set up for mmap\n"); |
e23ccc0a PO |
2384 | return -EINVAL; |
2385 | } | |
2386 | ||
2387 | /* | |
2388 | * Check memory area access mode. | |
2389 | */ | |
2390 | if (!(vma->vm_flags & VM_SHARED)) { | |
3050040b | 2391 | dprintk(1, "invalid vma flags, VM_SHARED needed\n"); |
e23ccc0a PO |
2392 | return -EINVAL; |
2393 | } | |
2394 | if (V4L2_TYPE_IS_OUTPUT(q->type)) { | |
2395 | if (!(vma->vm_flags & VM_WRITE)) { | |
3050040b | 2396 | dprintk(1, "invalid vma flags, VM_WRITE needed\n"); |
e23ccc0a PO |
2397 | return -EINVAL; |
2398 | } | |
2399 | } else { | |
2400 | if (!(vma->vm_flags & VM_READ)) { | |
3050040b | 2401 | dprintk(1, "invalid vma flags, VM_READ needed\n"); |
e23ccc0a PO |
2402 | return -EINVAL; |
2403 | } | |
2404 | } | |
74753cff HV |
2405 | if (vb2_fileio_is_active(q)) { |
2406 | dprintk(1, "mmap: file io in progress\n"); | |
2407 | return -EBUSY; | |
2408 | } | |
e23ccc0a PO |
2409 | |
2410 | /* | |
2411 | * Find the plane corresponding to the offset passed by userspace. | |
2412 | */ | |
2413 | ret = __find_plane_by_offset(q, off, &buffer, &plane); | |
2414 | if (ret) | |
2415 | return ret; | |
2416 | ||
2417 | vb = q->bufs[buffer]; | |
e23ccc0a | 2418 | |
7f841459 MCC |
2419 | /* |
2420 | * MMAP requires page_aligned buffers. | |
2421 | * The buffer length was page_aligned at __vb2_buf_mem_alloc(), | |
2422 | * so, we need to do the same here. | |
2423 | */ | |
2424 | length = PAGE_ALIGN(vb->v4l2_planes[plane].length); | |
2425 | if (length < (vma->vm_end - vma->vm_start)) { | |
2426 | dprintk(1, | |
2427 | "MMAP invalid, as it would overflow buffer length\n"); | |
068a0df7 SWK |
2428 | return -EINVAL; |
2429 | } | |
2430 | ||
b5b4541e | 2431 | ret = call_memop(vb, mmap, vb->planes[plane].mem_priv, vma); |
a1d36d8c | 2432 | if (ret) |
e23ccc0a PO |
2433 | return ret; |
2434 | ||
3050040b | 2435 | dprintk(3, "buffer %d, plane %d successfully mapped\n", buffer, plane); |
e23ccc0a PO |
2436 | return 0; |
2437 | } | |
2438 | EXPORT_SYMBOL_GPL(vb2_mmap); | |
2439 | ||
6f524ec1 SJ |
2440 | #ifndef CONFIG_MMU |
2441 | unsigned long vb2_get_unmapped_area(struct vb2_queue *q, | |
2442 | unsigned long addr, | |
2443 | unsigned long len, | |
2444 | unsigned long pgoff, | |
2445 | unsigned long flags) | |
2446 | { | |
2447 | unsigned long off = pgoff << PAGE_SHIFT; | |
2448 | struct vb2_buffer *vb; | |
2449 | unsigned int buffer, plane; | |
2450 | int ret; | |
2451 | ||
2452 | if (q->memory != V4L2_MEMORY_MMAP) { | |
3050040b | 2453 | dprintk(1, "queue is not currently set up for mmap\n"); |
6f524ec1 SJ |
2454 | return -EINVAL; |
2455 | } | |
2456 | ||
2457 | /* | |
2458 | * Find the plane corresponding to the offset passed by userspace. | |
2459 | */ | |
2460 | ret = __find_plane_by_offset(q, off, &buffer, &plane); | |
2461 | if (ret) | |
2462 | return ret; | |
2463 | ||
2464 | vb = q->bufs[buffer]; | |
2465 | ||
2466 | return (unsigned long)vb2_plane_vaddr(vb, plane); | |
2467 | } | |
2468 | EXPORT_SYMBOL_GPL(vb2_get_unmapped_area); | |
2469 | #endif | |
2470 | ||
b25748fe MS |
2471 | static int __vb2_init_fileio(struct vb2_queue *q, int read); |
2472 | static int __vb2_cleanup_fileio(struct vb2_queue *q); | |
e23ccc0a PO |
2473 | |
2474 | /** | |
2475 | * vb2_poll() - implements poll userspace operation | |
2476 | * @q: videobuf2 queue | |
2477 | * @file: file argument passed to the poll file operation handler | |
2478 | * @wait: wait argument passed to the poll file operation handler | |
2479 | * | |
2480 | * This function implements poll file operation handler for a driver. | |
2481 | * For CAPTURE queues, if a buffer is ready to be dequeued, the userspace will | |
2482 | * be informed that the file descriptor of a video device is available for | |
2483 | * reading. | |
2484 | * For OUTPUT queues, if a buffer is ready to be dequeued, the file descriptor | |
2485 | * will be reported as available for writing. | |
2486 | * | |
95213ceb HV |
2487 | * If the driver uses struct v4l2_fh, then vb2_poll() will also check for any |
2488 | * pending events. | |
2489 | * | |
e23ccc0a PO |
2490 | * The return values from this function are intended to be directly returned |
2491 | * from poll handler in driver. | |
2492 | */ | |
2493 | unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait) | |
2494 | { | |
95213ceb | 2495 | struct video_device *vfd = video_devdata(file); |
bf5c7cbb | 2496 | unsigned long req_events = poll_requested_events(wait); |
e23ccc0a | 2497 | struct vb2_buffer *vb = NULL; |
95213ceb HV |
2498 | unsigned int res = 0; |
2499 | unsigned long flags; | |
2500 | ||
2501 | if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) { | |
2502 | struct v4l2_fh *fh = file->private_data; | |
2503 | ||
2504 | if (v4l2_event_pending(fh)) | |
2505 | res = POLLPRI; | |
2506 | else if (req_events & POLLPRI) | |
2507 | poll_wait(file, &fh->wait, wait); | |
2508 | } | |
e23ccc0a | 2509 | |
cd13823f HV |
2510 | if (!V4L2_TYPE_IS_OUTPUT(q->type) && !(req_events & (POLLIN | POLLRDNORM))) |
2511 | return res; | |
2512 | if (V4L2_TYPE_IS_OUTPUT(q->type) && !(req_events & (POLLOUT | POLLWRNORM))) | |
2513 | return res; | |
2514 | ||
b25748fe | 2515 | /* |
4ffabdb3 | 2516 | * Start file I/O emulator only if streaming API has not been used yet. |
b25748fe | 2517 | */ |
74753cff | 2518 | if (q->num_buffers == 0 && !vb2_fileio_is_active(q)) { |
bf5c7cbb HV |
2519 | if (!V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_READ) && |
2520 | (req_events & (POLLIN | POLLRDNORM))) { | |
95213ceb HV |
2521 | if (__vb2_init_fileio(q, 1)) |
2522 | return res | POLLERR; | |
b25748fe | 2523 | } |
bf5c7cbb HV |
2524 | if (V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_WRITE) && |
2525 | (req_events & (POLLOUT | POLLWRNORM))) { | |
95213ceb HV |
2526 | if (__vb2_init_fileio(q, 0)) |
2527 | return res | POLLERR; | |
b25748fe MS |
2528 | /* |
2529 | * Write to OUTPUT queue can be done immediately. | |
2530 | */ | |
95213ceb | 2531 | return res | POLLOUT | POLLWRNORM; |
b25748fe MS |
2532 | } |
2533 | } | |
2534 | ||
e23ccc0a PO |
2535 | /* |
2536 | * There is nothing to wait for if no buffers have already been queued. | |
2537 | */ | |
2538 | if (list_empty(&q->queued_list)) | |
95213ceb | 2539 | return res | POLLERR; |
e23ccc0a | 2540 | |
412cb87d SWK |
2541 | if (list_empty(&q->done_list)) |
2542 | poll_wait(file, &q->done_wq, wait); | |
e23ccc0a PO |
2543 | |
2544 | /* | |
2545 | * Take first buffer available for dequeuing. | |
2546 | */ | |
2547 | spin_lock_irqsave(&q->done_lock, flags); | |
2548 | if (!list_empty(&q->done_list)) | |
2549 | vb = list_first_entry(&q->done_list, struct vb2_buffer, | |
2550 | done_entry); | |
2551 | spin_unlock_irqrestore(&q->done_lock, flags); | |
2552 | ||
2553 | if (vb && (vb->state == VB2_BUF_STATE_DONE | |
2554 | || vb->state == VB2_BUF_STATE_ERROR)) { | |
95213ceb HV |
2555 | return (V4L2_TYPE_IS_OUTPUT(q->type)) ? |
2556 | res | POLLOUT | POLLWRNORM : | |
2557 | res | POLLIN | POLLRDNORM; | |
e23ccc0a | 2558 | } |
95213ceb | 2559 | return res; |
e23ccc0a PO |
2560 | } |
2561 | EXPORT_SYMBOL_GPL(vb2_poll); | |
2562 | ||
2563 | /** | |
2564 | * vb2_queue_init() - initialize a videobuf2 queue | |
2565 | * @q: videobuf2 queue; this structure should be allocated in driver | |
2566 | * | |
2567 | * The vb2_queue structure should be allocated by the driver. The driver is | |
2568 | * responsible of clearing it's content and setting initial values for some | |
2569 | * required entries before calling this function. | |
2570 | * q->ops, q->mem_ops, q->type and q->io_modes are mandatory. Please refer | |
2571 | * to the struct vb2_queue description in include/media/videobuf2-core.h | |
2572 | * for more information. | |
2573 | */ | |
2574 | int vb2_queue_init(struct vb2_queue *q) | |
2575 | { | |
896f38f5 EG |
2576 | /* |
2577 | * Sanity check | |
2578 | */ | |
2579 | if (WARN_ON(!q) || | |
2580 | WARN_ON(!q->ops) || | |
2581 | WARN_ON(!q->mem_ops) || | |
2582 | WARN_ON(!q->type) || | |
2583 | WARN_ON(!q->io_modes) || | |
2584 | WARN_ON(!q->ops->queue_setup) || | |
6aa69f99 | 2585 | WARN_ON(!q->ops->buf_queue) || |
872484ce SA |
2586 | WARN_ON(q->timestamp_flags & |
2587 | ~(V4L2_BUF_FLAG_TIMESTAMP_MASK | | |
2588 | V4L2_BUF_FLAG_TSTAMP_SRC_MASK))) | |
896f38f5 | 2589 | return -EINVAL; |
e23ccc0a | 2590 | |
6aa69f99 | 2591 | /* Warn that the driver should choose an appropriate timestamp type */ |
c57ff792 SA |
2592 | WARN_ON((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == |
2593 | V4L2_BUF_FLAG_TIMESTAMP_UNKNOWN); | |
6aa69f99 | 2594 | |
e23ccc0a PO |
2595 | INIT_LIST_HEAD(&q->queued_list); |
2596 | INIT_LIST_HEAD(&q->done_list); | |
2597 | spin_lock_init(&q->done_lock); | |
2598 | init_waitqueue_head(&q->done_wq); | |
2599 | ||
2600 | if (q->buf_struct_size == 0) | |
2601 | q->buf_struct_size = sizeof(struct vb2_buffer); | |
2602 | ||
2603 | return 0; | |
2604 | } | |
2605 | EXPORT_SYMBOL_GPL(vb2_queue_init); | |
2606 | ||
2607 | /** | |
2608 | * vb2_queue_release() - stop streaming, release the queue and free memory | |
2609 | * @q: videobuf2 queue | |
2610 | * | |
2611 | * This function stops streaming and performs necessary clean ups, including | |
2612 | * freeing video buffer memory. The driver is responsible for freeing | |
2613 | * the vb2_queue structure itself. | |
2614 | */ | |
2615 | void vb2_queue_release(struct vb2_queue *q) | |
2616 | { | |
b25748fe | 2617 | __vb2_cleanup_fileio(q); |
e23ccc0a | 2618 | __vb2_queue_cancel(q); |
2d86401c | 2619 | __vb2_queue_free(q, q->num_buffers); |
e23ccc0a PO |
2620 | } |
2621 | EXPORT_SYMBOL_GPL(vb2_queue_release); | |
2622 | ||
b25748fe MS |
2623 | /** |
2624 | * struct vb2_fileio_buf - buffer context used by file io emulator | |
2625 | * | |
2626 | * vb2 provides a compatibility layer and emulator of file io (read and | |
2627 | * write) calls on top of streaming API. This structure is used for | |
2628 | * tracking context related to the buffers. | |
2629 | */ | |
2630 | struct vb2_fileio_buf { | |
2631 | void *vaddr; | |
2632 | unsigned int size; | |
2633 | unsigned int pos; | |
2634 | unsigned int queued:1; | |
2635 | }; | |
2636 | ||
2637 | /** | |
2638 | * struct vb2_fileio_data - queue context used by file io emulator | |
2639 | * | |
4e5a4d8a HV |
2640 | * @cur_index: the index of the buffer currently being read from or |
2641 | * written to. If equal to q->num_buffers then a new buffer | |
2642 | * must be dequeued. | |
2643 | * @initial_index: in the read() case all buffers are queued up immediately | |
2644 | * in __vb2_init_fileio() and __vb2_perform_fileio() just cycles | |
2645 | * buffers. However, in the write() case no buffers are initially | |
2646 | * queued, instead whenever a buffer is full it is queued up by | |
2647 | * __vb2_perform_fileio(). Only once all available buffers have | |
2648 | * been queued up will __vb2_perform_fileio() start to dequeue | |
2649 | * buffers. This means that initially __vb2_perform_fileio() | |
2650 | * needs to know what buffer index to use when it is queuing up | |
2651 | * the buffers for the first time. That initial index is stored | |
2652 | * in this field. Once it is equal to q->num_buffers all | |
2653 | * available buffers have been queued and __vb2_perform_fileio() | |
2654 | * should start the normal dequeue/queue cycle. | |
2655 | * | |
b25748fe MS |
2656 | * vb2 provides a compatibility layer and emulator of file io (read and |
2657 | * write) calls on top of streaming API. For proper operation it required | |
2658 | * this structure to save the driver state between each call of the read | |
2659 | * or write function. | |
2660 | */ | |
2661 | struct vb2_fileio_data { | |
2662 | struct v4l2_requestbuffers req; | |
7bb6edd3 | 2663 | struct v4l2_plane p; |
b25748fe MS |
2664 | struct v4l2_buffer b; |
2665 | struct vb2_fileio_buf bufs[VIDEO_MAX_FRAME]; | |
4e5a4d8a HV |
2666 | unsigned int cur_index; |
2667 | unsigned int initial_index; | |
b25748fe MS |
2668 | unsigned int q_count; |
2669 | unsigned int dq_count; | |
2670 | unsigned int flags; | |
2671 | }; | |
2672 | ||
2673 | /** | |
2674 | * __vb2_init_fileio() - initialize file io emulator | |
2675 | * @q: videobuf2 queue | |
2676 | * @read: mode selector (1 means read, 0 means write) | |
2677 | */ | |
2678 | static int __vb2_init_fileio(struct vb2_queue *q, int read) | |
2679 | { | |
2680 | struct vb2_fileio_data *fileio; | |
2681 | int i, ret; | |
2682 | unsigned int count = 0; | |
2683 | ||
2684 | /* | |
2685 | * Sanity check | |
2686 | */ | |
e4d25816 HV |
2687 | if (WARN_ON((read && !(q->io_modes & VB2_READ)) || |
2688 | (!read && !(q->io_modes & VB2_WRITE)))) | |
2689 | return -EINVAL; | |
b25748fe MS |
2690 | |
2691 | /* | |
2692 | * Check if device supports mapping buffers to kernel virtual space. | |
2693 | */ | |
2694 | if (!q->mem_ops->vaddr) | |
2695 | return -EBUSY; | |
2696 | ||
2697 | /* | |
2698 | * Check if streaming api has not been already activated. | |
2699 | */ | |
2700 | if (q->streaming || q->num_buffers > 0) | |
2701 | return -EBUSY; | |
2702 | ||
2703 | /* | |
2704 | * Start with count 1, driver can increase it in queue_setup() | |
2705 | */ | |
2706 | count = 1; | |
2707 | ||
2708 | dprintk(3, "setting up file io: mode %s, count %d, flags %08x\n", | |
2709 | (read) ? "read" : "write", count, q->io_flags); | |
2710 | ||
2711 | fileio = kzalloc(sizeof(struct vb2_fileio_data), GFP_KERNEL); | |
2712 | if (fileio == NULL) | |
2713 | return -ENOMEM; | |
2714 | ||
2715 | fileio->flags = q->io_flags; | |
2716 | ||
2717 | /* | |
2718 | * Request buffers and use MMAP type to force driver | |
2719 | * to allocate buffers by itself. | |
2720 | */ | |
2721 | fileio->req.count = count; | |
2722 | fileio->req.memory = V4L2_MEMORY_MMAP; | |
2723 | fileio->req.type = q->type; | |
74753cff HV |
2724 | q->fileio = fileio; |
2725 | ret = __reqbufs(q, &fileio->req); | |
b25748fe MS |
2726 | if (ret) |
2727 | goto err_kfree; | |
2728 | ||
2729 | /* | |
2730 | * Check if plane_count is correct | |
2731 | * (multiplane buffers are not supported). | |
2732 | */ | |
2733 | if (q->bufs[0]->num_planes != 1) { | |
b25748fe MS |
2734 | ret = -EBUSY; |
2735 | goto err_reqbufs; | |
2736 | } | |
2737 | ||
2738 | /* | |
2739 | * Get kernel address of each buffer. | |
2740 | */ | |
2741 | for (i = 0; i < q->num_buffers; i++) { | |
2742 | fileio->bufs[i].vaddr = vb2_plane_vaddr(q->bufs[i], 0); | |
5dd6946c WY |
2743 | if (fileio->bufs[i].vaddr == NULL) { |
2744 | ret = -EINVAL; | |
b25748fe | 2745 | goto err_reqbufs; |
5dd6946c | 2746 | } |
b25748fe MS |
2747 | fileio->bufs[i].size = vb2_plane_size(q->bufs[i], 0); |
2748 | } | |
2749 | ||
2750 | /* | |
2751 | * Read mode requires pre queuing of all buffers. | |
2752 | */ | |
2753 | if (read) { | |
7bb6edd3 HV |
2754 | bool is_multiplanar = V4L2_TYPE_IS_MULTIPLANAR(q->type); |
2755 | ||
b25748fe MS |
2756 | /* |
2757 | * Queue all buffers. | |
2758 | */ | |
2759 | for (i = 0; i < q->num_buffers; i++) { | |
2760 | struct v4l2_buffer *b = &fileio->b; | |
7bb6edd3 | 2761 | |
b25748fe MS |
2762 | memset(b, 0, sizeof(*b)); |
2763 | b->type = q->type; | |
7bb6edd3 HV |
2764 | if (is_multiplanar) { |
2765 | memset(&fileio->p, 0, sizeof(fileio->p)); | |
2766 | b->m.planes = &fileio->p; | |
2767 | b->length = 1; | |
2768 | } | |
b25748fe MS |
2769 | b->memory = q->memory; |
2770 | b->index = i; | |
74753cff | 2771 | ret = vb2_internal_qbuf(q, b); |
b25748fe MS |
2772 | if (ret) |
2773 | goto err_reqbufs; | |
2774 | fileio->bufs[i].queued = 1; | |
2775 | } | |
4e5a4d8a HV |
2776 | /* |
2777 | * All buffers have been queued, so mark that by setting | |
2778 | * initial_index to q->num_buffers | |
2779 | */ | |
2780 | fileio->initial_index = q->num_buffers; | |
2781 | fileio->cur_index = q->num_buffers; | |
b25748fe MS |
2782 | } |
2783 | ||
02f142ec HV |
2784 | /* |
2785 | * Start streaming. | |
2786 | */ | |
74753cff | 2787 | ret = vb2_internal_streamon(q, q->type); |
02f142ec HV |
2788 | if (ret) |
2789 | goto err_reqbufs; | |
2790 | ||
b25748fe MS |
2791 | return ret; |
2792 | ||
2793 | err_reqbufs: | |
a67e1722 | 2794 | fileio->req.count = 0; |
74753cff | 2795 | __reqbufs(q, &fileio->req); |
b25748fe MS |
2796 | |
2797 | err_kfree: | |
74753cff | 2798 | q->fileio = NULL; |
b25748fe MS |
2799 | kfree(fileio); |
2800 | return ret; | |
2801 | } | |
2802 | ||
2803 | /** | |
2804 | * __vb2_cleanup_fileio() - free resourced used by file io emulator | |
2805 | * @q: videobuf2 queue | |
2806 | */ | |
2807 | static int __vb2_cleanup_fileio(struct vb2_queue *q) | |
2808 | { | |
2809 | struct vb2_fileio_data *fileio = q->fileio; | |
2810 | ||
2811 | if (fileio) { | |
b2f2f047 | 2812 | vb2_internal_streamoff(q, q->type); |
b25748fe | 2813 | q->fileio = NULL; |
b25748fe MS |
2814 | fileio->req.count = 0; |
2815 | vb2_reqbufs(q, &fileio->req); | |
2816 | kfree(fileio); | |
2817 | dprintk(3, "file io emulator closed\n"); | |
2818 | } | |
2819 | return 0; | |
2820 | } | |
2821 | ||
2822 | /** | |
2823 | * __vb2_perform_fileio() - perform a single file io (read or write) operation | |
2824 | * @q: videobuf2 queue | |
2825 | * @data: pointed to target userspace buffer | |
2826 | * @count: number of bytes to read or write | |
2827 | * @ppos: file handle position tracking pointer | |
2828 | * @nonblock: mode selector (1 means blocking calls, 0 means nonblocking) | |
2829 | * @read: access mode selector (1 means read, 0 means write) | |
2830 | */ | |
2831 | static size_t __vb2_perform_fileio(struct vb2_queue *q, char __user *data, size_t count, | |
2832 | loff_t *ppos, int nonblock, int read) | |
2833 | { | |
2834 | struct vb2_fileio_data *fileio; | |
2835 | struct vb2_fileio_buf *buf; | |
7bb6edd3 | 2836 | bool is_multiplanar = V4L2_TYPE_IS_MULTIPLANAR(q->type); |
ebd7c505 HV |
2837 | /* |
2838 | * When using write() to write data to an output video node the vb2 core | |
2839 | * should set timestamps if V4L2_BUF_FLAG_TIMESTAMP_COPY is set. Nobody | |
2840 | * else is able to provide this information with the write() operation. | |
2841 | */ | |
2842 | bool set_timestamp = !read && | |
2843 | (q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == | |
2844 | V4L2_BUF_FLAG_TIMESTAMP_COPY; | |
b25748fe MS |
2845 | int ret, index; |
2846 | ||
fd4354cf | 2847 | dprintk(3, "mode %s, offset %ld, count %zd, %sblocking\n", |
b25748fe MS |
2848 | read ? "read" : "write", (long)*ppos, count, |
2849 | nonblock ? "non" : ""); | |
2850 | ||
2851 | if (!data) | |
2852 | return -EINVAL; | |
2853 | ||
2854 | /* | |
2855 | * Initialize emulator on first call. | |
2856 | */ | |
74753cff | 2857 | if (!vb2_fileio_is_active(q)) { |
b25748fe | 2858 | ret = __vb2_init_fileio(q, read); |
fd4354cf | 2859 | dprintk(3, "vb2_init_fileio result: %d\n", ret); |
b25748fe MS |
2860 | if (ret) |
2861 | return ret; | |
2862 | } | |
2863 | fileio = q->fileio; | |
2864 | ||
b25748fe MS |
2865 | /* |
2866 | * Check if we need to dequeue the buffer. | |
2867 | */ | |
4e5a4d8a | 2868 | index = fileio->cur_index; |
88e26870 | 2869 | if (index >= q->num_buffers) { |
b25748fe MS |
2870 | /* |
2871 | * Call vb2_dqbuf to get buffer back. | |
2872 | */ | |
2873 | memset(&fileio->b, 0, sizeof(fileio->b)); | |
2874 | fileio->b.type = q->type; | |
2875 | fileio->b.memory = q->memory; | |
7bb6edd3 HV |
2876 | if (is_multiplanar) { |
2877 | memset(&fileio->p, 0, sizeof(fileio->p)); | |
2878 | fileio->b.m.planes = &fileio->p; | |
2879 | fileio->b.length = 1; | |
2880 | } | |
b2f2f047 | 2881 | ret = vb2_internal_dqbuf(q, &fileio->b, nonblock); |
fd4354cf | 2882 | dprintk(5, "vb2_dqbuf result: %d\n", ret); |
b25748fe | 2883 | if (ret) |
b2f2f047 | 2884 | return ret; |
b25748fe MS |
2885 | fileio->dq_count += 1; |
2886 | ||
4e5a4d8a | 2887 | fileio->cur_index = index = fileio->b.index; |
88e26870 HV |
2888 | buf = &fileio->bufs[index]; |
2889 | ||
b25748fe MS |
2890 | /* |
2891 | * Get number of bytes filled by the driver | |
2892 | */ | |
88e26870 | 2893 | buf->pos = 0; |
b25748fe | 2894 | buf->queued = 0; |
88e26870 HV |
2895 | buf->size = read ? vb2_get_plane_payload(q->bufs[index], 0) |
2896 | : vb2_plane_size(q->bufs[index], 0); | |
2897 | } else { | |
2898 | buf = &fileio->bufs[index]; | |
b25748fe MS |
2899 | } |
2900 | ||
2901 | /* | |
2902 | * Limit count on last few bytes of the buffer. | |
2903 | */ | |
2904 | if (buf->pos + count > buf->size) { | |
2905 | count = buf->size - buf->pos; | |
08b99e26 | 2906 | dprintk(5, "reducing read count: %zd\n", count); |
b25748fe MS |
2907 | } |
2908 | ||
2909 | /* | |
2910 | * Transfer data to userspace. | |
2911 | */ | |
fd4354cf | 2912 | dprintk(3, "copying %zd bytes - buffer %d, offset %u\n", |
b25748fe MS |
2913 | count, index, buf->pos); |
2914 | if (read) | |
2915 | ret = copy_to_user(data, buf->vaddr + buf->pos, count); | |
2916 | else | |
2917 | ret = copy_from_user(buf->vaddr + buf->pos, data, count); | |
2918 | if (ret) { | |
fd4354cf | 2919 | dprintk(3, "error copying data\n"); |
b2f2f047 | 2920 | return -EFAULT; |
b25748fe MS |
2921 | } |
2922 | ||
2923 | /* | |
2924 | * Update counters. | |
2925 | */ | |
2926 | buf->pos += count; | |
2927 | *ppos += count; | |
2928 | ||
2929 | /* | |
2930 | * Queue next buffer if required. | |
2931 | */ | |
2932 | if (buf->pos == buf->size || | |
2933 | (!read && (fileio->flags & VB2_FILEIO_WRITE_IMMEDIATELY))) { | |
2934 | /* | |
2935 | * Check if this is the last buffer to read. | |
2936 | */ | |
2937 | if (read && (fileio->flags & VB2_FILEIO_READ_ONCE) && | |
2938 | fileio->dq_count == 1) { | |
fd4354cf | 2939 | dprintk(3, "read limit reached\n"); |
b25748fe MS |
2940 | return __vb2_cleanup_fileio(q); |
2941 | } | |
2942 | ||
2943 | /* | |
2944 | * Call vb2_qbuf and give buffer to the driver. | |
2945 | */ | |
2946 | memset(&fileio->b, 0, sizeof(fileio->b)); | |
2947 | fileio->b.type = q->type; | |
2948 | fileio->b.memory = q->memory; | |
2949 | fileio->b.index = index; | |
2950 | fileio->b.bytesused = buf->pos; | |
7bb6edd3 HV |
2951 | if (is_multiplanar) { |
2952 | memset(&fileio->p, 0, sizeof(fileio->p)); | |
2953 | fileio->p.bytesused = buf->pos; | |
2954 | fileio->b.m.planes = &fileio->p; | |
2955 | fileio->b.length = 1; | |
2956 | } | |
ebd7c505 HV |
2957 | if (set_timestamp) |
2958 | v4l2_get_timestamp(&fileio->b.timestamp); | |
b2f2f047 | 2959 | ret = vb2_internal_qbuf(q, &fileio->b); |
fd4354cf | 2960 | dprintk(5, "vb2_dbuf result: %d\n", ret); |
b25748fe | 2961 | if (ret) |
b2f2f047 | 2962 | return ret; |
b25748fe MS |
2963 | |
2964 | /* | |
2965 | * Buffer has been queued, update the status | |
2966 | */ | |
2967 | buf->pos = 0; | |
2968 | buf->queued = 1; | |
88e26870 | 2969 | buf->size = vb2_plane_size(q->bufs[index], 0); |
b25748fe | 2970 | fileio->q_count += 1; |
4e5a4d8a HV |
2971 | /* |
2972 | * If we are queuing up buffers for the first time, then | |
2973 | * increase initial_index by one. | |
2974 | */ | |
2975 | if (fileio->initial_index < q->num_buffers) | |
2976 | fileio->initial_index++; | |
2977 | /* | |
2978 | * The next buffer to use is either a buffer that's going to be | |
2979 | * queued for the first time (initial_index < q->num_buffers) | |
2980 | * or it is equal to q->num_buffers, meaning that the next | |
2981 | * time we need to dequeue a buffer since we've now queued up | |
2982 | * all the 'first time' buffers. | |
2983 | */ | |
2984 | fileio->cur_index = fileio->initial_index; | |
b25748fe MS |
2985 | } |
2986 | ||
2987 | /* | |
2988 | * Return proper number of bytes processed. | |
2989 | */ | |
2990 | if (ret == 0) | |
2991 | ret = count; | |
b25748fe MS |
2992 | return ret; |
2993 | } | |
2994 | ||
2995 | size_t vb2_read(struct vb2_queue *q, char __user *data, size_t count, | |
2996 | loff_t *ppos, int nonblocking) | |
2997 | { | |
2998 | return __vb2_perform_fileio(q, data, count, ppos, nonblocking, 1); | |
2999 | } | |
3000 | EXPORT_SYMBOL_GPL(vb2_read); | |
3001 | ||
819585bc | 3002 | size_t vb2_write(struct vb2_queue *q, const char __user *data, size_t count, |
b25748fe MS |
3003 | loff_t *ppos, int nonblocking) |
3004 | { | |
819585bc RR |
3005 | return __vb2_perform_fileio(q, (char __user *) data, count, |
3006 | ppos, nonblocking, 0); | |
b25748fe MS |
3007 | } |
3008 | EXPORT_SYMBOL_GPL(vb2_write); | |
3009 | ||
3415a89f HV |
3010 | struct vb2_threadio_data { |
3011 | struct task_struct *thread; | |
3012 | vb2_thread_fnc fnc; | |
3013 | void *priv; | |
3014 | bool stop; | |
3015 | }; | |
3016 | ||
3017 | static int vb2_thread(void *data) | |
3018 | { | |
3019 | struct vb2_queue *q = data; | |
3020 | struct vb2_threadio_data *threadio = q->threadio; | |
3021 | struct vb2_fileio_data *fileio = q->fileio; | |
3022 | bool set_timestamp = false; | |
3023 | int prequeue = 0; | |
3024 | int index = 0; | |
3025 | int ret = 0; | |
3026 | ||
3027 | if (V4L2_TYPE_IS_OUTPUT(q->type)) { | |
3028 | prequeue = q->num_buffers; | |
3029 | set_timestamp = | |
3030 | (q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == | |
3031 | V4L2_BUF_FLAG_TIMESTAMP_COPY; | |
3032 | } | |
3033 | ||
3034 | set_freezable(); | |
3035 | ||
3036 | for (;;) { | |
3037 | struct vb2_buffer *vb; | |
3038 | ||
3039 | /* | |
3040 | * Call vb2_dqbuf to get buffer back. | |
3041 | */ | |
3042 | memset(&fileio->b, 0, sizeof(fileio->b)); | |
3043 | fileio->b.type = q->type; | |
3044 | fileio->b.memory = q->memory; | |
3045 | if (prequeue) { | |
3046 | fileio->b.index = index++; | |
3047 | prequeue--; | |
3048 | } else { | |
3049 | call_void_qop(q, wait_finish, q); | |
3050 | ret = vb2_internal_dqbuf(q, &fileio->b, 0); | |
3051 | call_void_qop(q, wait_prepare, q); | |
3052 | dprintk(5, "file io: vb2_dqbuf result: %d\n", ret); | |
3053 | } | |
3054 | if (threadio->stop) | |
3055 | break; | |
3056 | if (ret) | |
3057 | break; | |
3058 | try_to_freeze(); | |
3059 | ||
3060 | vb = q->bufs[fileio->b.index]; | |
3061 | if (!(fileio->b.flags & V4L2_BUF_FLAG_ERROR)) | |
3062 | ret = threadio->fnc(vb, threadio->priv); | |
3063 | if (ret) | |
3064 | break; | |
3065 | call_void_qop(q, wait_finish, q); | |
3066 | if (set_timestamp) | |
3067 | v4l2_get_timestamp(&fileio->b.timestamp); | |
3068 | ret = vb2_internal_qbuf(q, &fileio->b); | |
3069 | call_void_qop(q, wait_prepare, q); | |
3070 | if (ret) | |
3071 | break; | |
3072 | } | |
3073 | ||
3074 | /* Hmm, linux becomes *very* unhappy without this ... */ | |
3075 | while (!kthread_should_stop()) { | |
3076 | set_current_state(TASK_INTERRUPTIBLE); | |
3077 | schedule(); | |
3078 | } | |
3079 | return 0; | |
3080 | } | |
3081 | ||
3082 | /* | |
3083 | * This function should not be used for anything else but the videobuf2-dvb | |
3084 | * support. If you think you have another good use-case for this, then please | |
3085 | * contact the linux-media mailinglist first. | |
3086 | */ | |
3087 | int vb2_thread_start(struct vb2_queue *q, vb2_thread_fnc fnc, void *priv, | |
3088 | const char *thread_name) | |
3089 | { | |
3090 | struct vb2_threadio_data *threadio; | |
3091 | int ret = 0; | |
3092 | ||
3093 | if (q->threadio) | |
3094 | return -EBUSY; | |
3095 | if (vb2_is_busy(q)) | |
3096 | return -EBUSY; | |
3097 | if (WARN_ON(q->fileio)) | |
3098 | return -EBUSY; | |
3099 | ||
3100 | threadio = kzalloc(sizeof(*threadio), GFP_KERNEL); | |
3101 | if (threadio == NULL) | |
3102 | return -ENOMEM; | |
3103 | threadio->fnc = fnc; | |
3104 | threadio->priv = priv; | |
3105 | ||
3106 | ret = __vb2_init_fileio(q, !V4L2_TYPE_IS_OUTPUT(q->type)); | |
3107 | dprintk(3, "file io: vb2_init_fileio result: %d\n", ret); | |
3108 | if (ret) | |
3109 | goto nomem; | |
3110 | q->threadio = threadio; | |
3111 | threadio->thread = kthread_run(vb2_thread, q, "vb2-%s", thread_name); | |
3112 | if (IS_ERR(threadio->thread)) { | |
3113 | ret = PTR_ERR(threadio->thread); | |
3114 | threadio->thread = NULL; | |
3115 | goto nothread; | |
3116 | } | |
3117 | return 0; | |
3118 | ||
3119 | nothread: | |
3120 | __vb2_cleanup_fileio(q); | |
3121 | nomem: | |
3122 | kfree(threadio); | |
3123 | return ret; | |
3124 | } | |
3125 | EXPORT_SYMBOL_GPL(vb2_thread_start); | |
3126 | ||
3127 | int vb2_thread_stop(struct vb2_queue *q) | |
3128 | { | |
3129 | struct vb2_threadio_data *threadio = q->threadio; | |
3130 | struct vb2_fileio_data *fileio = q->fileio; | |
3131 | int err; | |
3132 | ||
3133 | if (threadio == NULL) | |
3134 | return 0; | |
3135 | call_void_qop(q, wait_finish, q); | |
3136 | threadio->stop = true; | |
3137 | vb2_internal_streamoff(q, q->type); | |
3138 | call_void_qop(q, wait_prepare, q); | |
3139 | q->fileio = NULL; | |
3140 | fileio->req.count = 0; | |
3141 | vb2_reqbufs(q, &fileio->req); | |
3142 | kfree(fileio); | |
3143 | err = kthread_stop(threadio->thread); | |
3144 | threadio->thread = NULL; | |
3145 | kfree(threadio); | |
3146 | q->fileio = NULL; | |
3147 | q->threadio = NULL; | |
3148 | return err; | |
3149 | } | |
3150 | EXPORT_SYMBOL_GPL(vb2_thread_stop); | |
4c1ffcaa HV |
3151 | |
3152 | /* | |
3153 | * The following functions are not part of the vb2 core API, but are helper | |
3154 | * functions that plug into struct v4l2_ioctl_ops, struct v4l2_file_operations | |
3155 | * and struct vb2_ops. | |
3156 | * They contain boilerplate code that most if not all drivers have to do | |
3157 | * and so they simplify the driver code. | |
3158 | */ | |
3159 | ||
3160 | /* The queue is busy if there is a owner and you are not that owner. */ | |
3161 | static inline bool vb2_queue_is_busy(struct video_device *vdev, struct file *file) | |
3162 | { | |
3163 | return vdev->queue->owner && vdev->queue->owner != file->private_data; | |
3164 | } | |
3165 | ||
3166 | /* vb2 ioctl helpers */ | |
3167 | ||
3168 | int vb2_ioctl_reqbufs(struct file *file, void *priv, | |
3169 | struct v4l2_requestbuffers *p) | |
3170 | { | |
3171 | struct video_device *vdev = video_devdata(file); | |
3172 | int res = __verify_memory_type(vdev->queue, p->memory, p->type); | |
3173 | ||
3174 | if (res) | |
3175 | return res; | |
3176 | if (vb2_queue_is_busy(vdev, file)) | |
3177 | return -EBUSY; | |
3178 | res = __reqbufs(vdev->queue, p); | |
3179 | /* If count == 0, then the owner has released all buffers and he | |
3180 | is no longer owner of the queue. Otherwise we have a new owner. */ | |
3181 | if (res == 0) | |
3182 | vdev->queue->owner = p->count ? file->private_data : NULL; | |
3183 | return res; | |
3184 | } | |
3185 | EXPORT_SYMBOL_GPL(vb2_ioctl_reqbufs); | |
3186 | ||
3187 | int vb2_ioctl_create_bufs(struct file *file, void *priv, | |
3188 | struct v4l2_create_buffers *p) | |
3189 | { | |
3190 | struct video_device *vdev = video_devdata(file); | |
3191 | int res = __verify_memory_type(vdev->queue, p->memory, p->format.type); | |
3192 | ||
3193 | p->index = vdev->queue->num_buffers; | |
3194 | /* If count == 0, then just check if memory and type are valid. | |
3195 | Any -EBUSY result from __verify_memory_type can be mapped to 0. */ | |
3196 | if (p->count == 0) | |
3197 | return res != -EBUSY ? res : 0; | |
3198 | if (res) | |
3199 | return res; | |
3200 | if (vb2_queue_is_busy(vdev, file)) | |
3201 | return -EBUSY; | |
3202 | res = __create_bufs(vdev->queue, p); | |
3203 | if (res == 0) | |
3204 | vdev->queue->owner = file->private_data; | |
3205 | return res; | |
3206 | } | |
3207 | EXPORT_SYMBOL_GPL(vb2_ioctl_create_bufs); | |
3208 | ||
3209 | int vb2_ioctl_prepare_buf(struct file *file, void *priv, | |
3210 | struct v4l2_buffer *p) | |
3211 | { | |
3212 | struct video_device *vdev = video_devdata(file); | |
3213 | ||
3214 | if (vb2_queue_is_busy(vdev, file)) | |
3215 | return -EBUSY; | |
3216 | return vb2_prepare_buf(vdev->queue, p); | |
3217 | } | |
3218 | EXPORT_SYMBOL_GPL(vb2_ioctl_prepare_buf); | |
3219 | ||
3220 | int vb2_ioctl_querybuf(struct file *file, void *priv, struct v4l2_buffer *p) | |
3221 | { | |
3222 | struct video_device *vdev = video_devdata(file); | |
3223 | ||
3224 | /* No need to call vb2_queue_is_busy(), anyone can query buffers. */ | |
3225 | return vb2_querybuf(vdev->queue, p); | |
3226 | } | |
3227 | EXPORT_SYMBOL_GPL(vb2_ioctl_querybuf); | |
3228 | ||
3229 | int vb2_ioctl_qbuf(struct file *file, void *priv, struct v4l2_buffer *p) | |
3230 | { | |
3231 | struct video_device *vdev = video_devdata(file); | |
3232 | ||
3233 | if (vb2_queue_is_busy(vdev, file)) | |
3234 | return -EBUSY; | |
3235 | return vb2_qbuf(vdev->queue, p); | |
3236 | } | |
3237 | EXPORT_SYMBOL_GPL(vb2_ioctl_qbuf); | |
3238 | ||
3239 | int vb2_ioctl_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p) | |
3240 | { | |
3241 | struct video_device *vdev = video_devdata(file); | |
3242 | ||
3243 | if (vb2_queue_is_busy(vdev, file)) | |
3244 | return -EBUSY; | |
3245 | return vb2_dqbuf(vdev->queue, p, file->f_flags & O_NONBLOCK); | |
3246 | } | |
3247 | EXPORT_SYMBOL_GPL(vb2_ioctl_dqbuf); | |
3248 | ||
3249 | int vb2_ioctl_streamon(struct file *file, void *priv, enum v4l2_buf_type i) | |
3250 | { | |
3251 | struct video_device *vdev = video_devdata(file); | |
3252 | ||
3253 | if (vb2_queue_is_busy(vdev, file)) | |
3254 | return -EBUSY; | |
3255 | return vb2_streamon(vdev->queue, i); | |
3256 | } | |
3257 | EXPORT_SYMBOL_GPL(vb2_ioctl_streamon); | |
3258 | ||
3259 | int vb2_ioctl_streamoff(struct file *file, void *priv, enum v4l2_buf_type i) | |
3260 | { | |
3261 | struct video_device *vdev = video_devdata(file); | |
3262 | ||
3263 | if (vb2_queue_is_busy(vdev, file)) | |
3264 | return -EBUSY; | |
3265 | return vb2_streamoff(vdev->queue, i); | |
3266 | } | |
3267 | EXPORT_SYMBOL_GPL(vb2_ioctl_streamoff); | |
3268 | ||
83ae7c5a TS |
3269 | int vb2_ioctl_expbuf(struct file *file, void *priv, struct v4l2_exportbuffer *p) |
3270 | { | |
3271 | struct video_device *vdev = video_devdata(file); | |
3272 | ||
3273 | if (vb2_queue_is_busy(vdev, file)) | |
3274 | return -EBUSY; | |
3275 | return vb2_expbuf(vdev->queue, p); | |
3276 | } | |
3277 | EXPORT_SYMBOL_GPL(vb2_ioctl_expbuf); | |
3278 | ||
4c1ffcaa HV |
3279 | /* v4l2_file_operations helpers */ |
3280 | ||
3281 | int vb2_fop_mmap(struct file *file, struct vm_area_struct *vma) | |
3282 | { | |
3283 | struct video_device *vdev = video_devdata(file); | |
8a90f1a6 LP |
3284 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; |
3285 | int err; | |
4c1ffcaa | 3286 | |
8a90f1a6 LP |
3287 | if (lock && mutex_lock_interruptible(lock)) |
3288 | return -ERESTARTSYS; | |
3289 | err = vb2_mmap(vdev->queue, vma); | |
3290 | if (lock) | |
3291 | mutex_unlock(lock); | |
3292 | return err; | |
4c1ffcaa HV |
3293 | } |
3294 | EXPORT_SYMBOL_GPL(vb2_fop_mmap); | |
3295 | ||
1380f575 | 3296 | int _vb2_fop_release(struct file *file, struct mutex *lock) |
4c1ffcaa HV |
3297 | { |
3298 | struct video_device *vdev = video_devdata(file); | |
3299 | ||
3300 | if (file->private_data == vdev->queue->owner) { | |
1380f575 RR |
3301 | if (lock) |
3302 | mutex_lock(lock); | |
4c1ffcaa HV |
3303 | vb2_queue_release(vdev->queue); |
3304 | vdev->queue->owner = NULL; | |
1380f575 RR |
3305 | if (lock) |
3306 | mutex_unlock(lock); | |
4c1ffcaa HV |
3307 | } |
3308 | return v4l2_fh_release(file); | |
3309 | } | |
1380f575 RR |
3310 | EXPORT_SYMBOL_GPL(_vb2_fop_release); |
3311 | ||
3312 | int vb2_fop_release(struct file *file) | |
3313 | { | |
3314 | struct video_device *vdev = video_devdata(file); | |
3315 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; | |
3316 | ||
3317 | return _vb2_fop_release(file, lock); | |
3318 | } | |
4c1ffcaa HV |
3319 | EXPORT_SYMBOL_GPL(vb2_fop_release); |
3320 | ||
819585bc | 3321 | ssize_t vb2_fop_write(struct file *file, const char __user *buf, |
4c1ffcaa HV |
3322 | size_t count, loff_t *ppos) |
3323 | { | |
3324 | struct video_device *vdev = video_devdata(file); | |
3325 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; | |
4c1ffcaa HV |
3326 | int err = -EBUSY; |
3327 | ||
cf533735 | 3328 | if (lock && mutex_lock_interruptible(lock)) |
4c1ffcaa HV |
3329 | return -ERESTARTSYS; |
3330 | if (vb2_queue_is_busy(vdev, file)) | |
3331 | goto exit; | |
3332 | err = vb2_write(vdev->queue, buf, count, ppos, | |
3333 | file->f_flags & O_NONBLOCK); | |
8c82c75c | 3334 | if (vdev->queue->fileio) |
4c1ffcaa HV |
3335 | vdev->queue->owner = file->private_data; |
3336 | exit: | |
cf533735 | 3337 | if (lock) |
4c1ffcaa HV |
3338 | mutex_unlock(lock); |
3339 | return err; | |
3340 | } | |
3341 | EXPORT_SYMBOL_GPL(vb2_fop_write); | |
3342 | ||
3343 | ssize_t vb2_fop_read(struct file *file, char __user *buf, | |
3344 | size_t count, loff_t *ppos) | |
3345 | { | |
3346 | struct video_device *vdev = video_devdata(file); | |
3347 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; | |
4c1ffcaa HV |
3348 | int err = -EBUSY; |
3349 | ||
cf533735 | 3350 | if (lock && mutex_lock_interruptible(lock)) |
4c1ffcaa HV |
3351 | return -ERESTARTSYS; |
3352 | if (vb2_queue_is_busy(vdev, file)) | |
3353 | goto exit; | |
3354 | err = vb2_read(vdev->queue, buf, count, ppos, | |
3355 | file->f_flags & O_NONBLOCK); | |
8c82c75c | 3356 | if (vdev->queue->fileio) |
4c1ffcaa HV |
3357 | vdev->queue->owner = file->private_data; |
3358 | exit: | |
cf533735 | 3359 | if (lock) |
4c1ffcaa HV |
3360 | mutex_unlock(lock); |
3361 | return err; | |
3362 | } | |
3363 | EXPORT_SYMBOL_GPL(vb2_fop_read); | |
3364 | ||
3365 | unsigned int vb2_fop_poll(struct file *file, poll_table *wait) | |
3366 | { | |
3367 | struct video_device *vdev = video_devdata(file); | |
3368 | struct vb2_queue *q = vdev->queue; | |
3369 | struct mutex *lock = q->lock ? q->lock : vdev->lock; | |
3370 | unsigned long req_events = poll_requested_events(wait); | |
3371 | unsigned res; | |
3372 | void *fileio; | |
4c1ffcaa HV |
3373 | bool must_lock = false; |
3374 | ||
3375 | /* Try to be smart: only lock if polling might start fileio, | |
3376 | otherwise locking will only introduce unwanted delays. */ | |
74753cff | 3377 | if (q->num_buffers == 0 && !vb2_fileio_is_active(q)) { |
4c1ffcaa HV |
3378 | if (!V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_READ) && |
3379 | (req_events & (POLLIN | POLLRDNORM))) | |
3380 | must_lock = true; | |
3381 | else if (V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_WRITE) && | |
3382 | (req_events & (POLLOUT | POLLWRNORM))) | |
3383 | must_lock = true; | |
3384 | } | |
3385 | ||
3386 | /* If locking is needed, but this helper doesn't know how, then you | |
3387 | shouldn't be using this helper but you should write your own. */ | |
cf533735 | 3388 | WARN_ON(must_lock && !lock); |
4c1ffcaa | 3389 | |
cf533735 | 3390 | if (must_lock && lock && mutex_lock_interruptible(lock)) |
4c1ffcaa HV |
3391 | return POLLERR; |
3392 | ||
3393 | fileio = q->fileio; | |
3394 | ||
3395 | res = vb2_poll(vdev->queue, file, wait); | |
3396 | ||
3397 | /* If fileio was started, then we have a new queue owner. */ | |
3398 | if (must_lock && !fileio && q->fileio) | |
3399 | q->owner = file->private_data; | |
cf533735 | 3400 | if (must_lock && lock) |
4c1ffcaa HV |
3401 | mutex_unlock(lock); |
3402 | return res; | |
3403 | } | |
3404 | EXPORT_SYMBOL_GPL(vb2_fop_poll); | |
3405 | ||
3406 | #ifndef CONFIG_MMU | |
3407 | unsigned long vb2_fop_get_unmapped_area(struct file *file, unsigned long addr, | |
3408 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
3409 | { | |
3410 | struct video_device *vdev = video_devdata(file); | |
8a90f1a6 LP |
3411 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; |
3412 | int ret; | |
4c1ffcaa | 3413 | |
8a90f1a6 LP |
3414 | if (lock && mutex_lock_interruptible(lock)) |
3415 | return -ERESTARTSYS; | |
3416 | ret = vb2_get_unmapped_area(vdev->queue, addr, len, pgoff, flags); | |
3417 | if (lock) | |
3418 | mutex_unlock(lock); | |
3419 | return ret; | |
4c1ffcaa HV |
3420 | } |
3421 | EXPORT_SYMBOL_GPL(vb2_fop_get_unmapped_area); | |
3422 | #endif | |
3423 | ||
3424 | /* vb2_ops helpers. Only use if vq->lock is non-NULL. */ | |
3425 | ||
3426 | void vb2_ops_wait_prepare(struct vb2_queue *vq) | |
3427 | { | |
3428 | mutex_unlock(vq->lock); | |
3429 | } | |
3430 | EXPORT_SYMBOL_GPL(vb2_ops_wait_prepare); | |
3431 | ||
3432 | void vb2_ops_wait_finish(struct vb2_queue *vq) | |
3433 | { | |
3434 | mutex_lock(vq->lock); | |
3435 | } | |
3436 | EXPORT_SYMBOL_GPL(vb2_ops_wait_finish); | |
3437 | ||
e23ccc0a | 3438 | MODULE_DESCRIPTION("Driver helper framework for Video for Linux 2"); |
95072084 | 3439 | MODULE_AUTHOR("Pawel Osciak <pawel@osciak.com>, Marek Szyprowski"); |
e23ccc0a | 3440 | MODULE_LICENSE("GPL"); |