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; | |
8a75ffb8 | 579 | unsigned int bytesused; |
8023ed09 LP |
580 | unsigned int plane; |
581 | ||
582 | if (!V4L2_TYPE_IS_OUTPUT(b->type)) | |
583 | return 0; | |
584 | ||
585 | if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) { | |
586 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
8a75ffb8 HV |
587 | length = (b->memory == V4L2_MEMORY_USERPTR || |
588 | b->memory == V4L2_MEMORY_DMABUF) | |
8023ed09 LP |
589 | ? b->m.planes[plane].length |
590 | : vb->v4l2_planes[plane].length; | |
8a75ffb8 HV |
591 | bytesused = b->m.planes[plane].bytesused |
592 | ? b->m.planes[plane].bytesused : length; | |
8023ed09 LP |
593 | |
594 | if (b->m.planes[plane].bytesused > length) | |
595 | return -EINVAL; | |
3c5c23c5 SN |
596 | |
597 | if (b->m.planes[plane].data_offset > 0 && | |
8a75ffb8 | 598 | b->m.planes[plane].data_offset >= bytesused) |
8023ed09 LP |
599 | return -EINVAL; |
600 | } | |
601 | } else { | |
602 | length = (b->memory == V4L2_MEMORY_USERPTR) | |
603 | ? b->length : vb->v4l2_planes[0].length; | |
8a75ffb8 | 604 | bytesused = b->bytesused ? b->bytesused : length; |
8023ed09 LP |
605 | |
606 | if (b->bytesused > length) | |
607 | return -EINVAL; | |
608 | } | |
609 | ||
610 | return 0; | |
611 | } | |
612 | ||
25a27d91 MS |
613 | /** |
614 | * __buffer_in_use() - return true if the buffer is in use and | |
615 | * the queue cannot be freed (by the means of REQBUFS(0)) call | |
616 | */ | |
617 | static bool __buffer_in_use(struct vb2_queue *q, struct vb2_buffer *vb) | |
618 | { | |
619 | unsigned int plane; | |
620 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
2c2dd6ac | 621 | void *mem_priv = vb->planes[plane].mem_priv; |
25a27d91 MS |
622 | /* |
623 | * If num_users() has not been provided, call_memop | |
624 | * will return 0, apparently nobody cares about this | |
625 | * case anyway. If num_users() returns more than 1, | |
626 | * we are not the only user of the plane's memory. | |
627 | */ | |
b5b4541e | 628 | if (mem_priv && call_memop(vb, num_users, mem_priv) > 1) |
25a27d91 MS |
629 | return true; |
630 | } | |
631 | return false; | |
632 | } | |
633 | ||
634 | /** | |
635 | * __buffers_in_use() - return true if any buffers on the queue are in use and | |
636 | * the queue cannot be freed (by the means of REQBUFS(0)) call | |
637 | */ | |
638 | static bool __buffers_in_use(struct vb2_queue *q) | |
639 | { | |
640 | unsigned int buffer; | |
641 | for (buffer = 0; buffer < q->num_buffers; ++buffer) { | |
642 | if (__buffer_in_use(q, q->bufs[buffer])) | |
643 | return true; | |
644 | } | |
645 | return false; | |
646 | } | |
647 | ||
e23ccc0a PO |
648 | /** |
649 | * __fill_v4l2_buffer() - fill in a struct v4l2_buffer with information to be | |
650 | * returned to userspace | |
651 | */ | |
32a77260 | 652 | static void __fill_v4l2_buffer(struct vb2_buffer *vb, struct v4l2_buffer *b) |
e23ccc0a PO |
653 | { |
654 | struct vb2_queue *q = vb->vb2_queue; | |
e23ccc0a | 655 | |
2b719d7b | 656 | /* Copy back data such as timestamp, flags, etc. */ |
e23ccc0a | 657 | memcpy(b, &vb->v4l2_buf, offsetof(struct v4l2_buffer, m)); |
2b719d7b | 658 | b->reserved2 = vb->v4l2_buf.reserved2; |
e23ccc0a PO |
659 | b->reserved = vb->v4l2_buf.reserved; |
660 | ||
661 | if (V4L2_TYPE_IS_MULTIPLANAR(q->type)) { | |
e23ccc0a PO |
662 | /* |
663 | * Fill in plane-related data if userspace provided an array | |
32a77260 | 664 | * for it. The caller has already verified memory and size. |
e23ccc0a | 665 | */ |
3c0b6061 | 666 | b->length = vb->num_planes; |
e23ccc0a PO |
667 | memcpy(b->m.planes, vb->v4l2_planes, |
668 | b->length * sizeof(struct v4l2_plane)); | |
669 | } else { | |
670 | /* | |
671 | * We use length and offset in v4l2_planes array even for | |
672 | * single-planar buffers, but userspace does not. | |
673 | */ | |
674 | b->length = vb->v4l2_planes[0].length; | |
675 | b->bytesused = vb->v4l2_planes[0].bytesused; | |
676 | if (q->memory == V4L2_MEMORY_MMAP) | |
677 | b->m.offset = vb->v4l2_planes[0].m.mem_offset; | |
678 | else if (q->memory == V4L2_MEMORY_USERPTR) | |
679 | b->m.userptr = vb->v4l2_planes[0].m.userptr; | |
c5384048 SS |
680 | else if (q->memory == V4L2_MEMORY_DMABUF) |
681 | b->m.fd = vb->v4l2_planes[0].m.fd; | |
e23ccc0a PO |
682 | } |
683 | ||
ea42c8ec MS |
684 | /* |
685 | * Clear any buffer state related flags. | |
686 | */ | |
1b18e7a0 | 687 | b->flags &= ~V4L2_BUFFER_MASK_FLAGS; |
7ce6fd8f SA |
688 | b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK; |
689 | if ((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) != | |
690 | V4L2_BUF_FLAG_TIMESTAMP_COPY) { | |
691 | /* | |
692 | * For non-COPY timestamps, drop timestamp source bits | |
693 | * and obtain the timestamp source from the queue. | |
694 | */ | |
695 | b->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK; | |
696 | b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TSTAMP_SRC_MASK; | |
697 | } | |
e23ccc0a PO |
698 | |
699 | switch (vb->state) { | |
700 | case VB2_BUF_STATE_QUEUED: | |
701 | case VB2_BUF_STATE_ACTIVE: | |
702 | b->flags |= V4L2_BUF_FLAG_QUEUED; | |
703 | break; | |
704 | case VB2_BUF_STATE_ERROR: | |
705 | b->flags |= V4L2_BUF_FLAG_ERROR; | |
706 | /* fall through */ | |
707 | case VB2_BUF_STATE_DONE: | |
708 | b->flags |= V4L2_BUF_FLAG_DONE; | |
709 | break; | |
ebc087d0 | 710 | case VB2_BUF_STATE_PREPARED: |
2d86401c GL |
711 | b->flags |= V4L2_BUF_FLAG_PREPARED; |
712 | break; | |
b18a8ff2 | 713 | case VB2_BUF_STATE_PREPARING: |
2d86401c | 714 | case VB2_BUF_STATE_DEQUEUED: |
e23ccc0a PO |
715 | /* nothing */ |
716 | break; | |
717 | } | |
718 | ||
25a27d91 | 719 | if (__buffer_in_use(q, vb)) |
e23ccc0a | 720 | b->flags |= V4L2_BUF_FLAG_MAPPED; |
e23ccc0a PO |
721 | } |
722 | ||
723 | /** | |
724 | * vb2_querybuf() - query video buffer information | |
725 | * @q: videobuf queue | |
726 | * @b: buffer struct passed from userspace to vidioc_querybuf handler | |
727 | * in driver | |
728 | * | |
729 | * Should be called from vidioc_querybuf ioctl handler in driver. | |
730 | * This function will verify the passed v4l2_buffer structure and fill the | |
731 | * relevant information for the userspace. | |
732 | * | |
733 | * The return values from this function are intended to be directly returned | |
734 | * from vidioc_querybuf handler in driver. | |
735 | */ | |
736 | int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b) | |
737 | { | |
738 | struct vb2_buffer *vb; | |
32a77260 | 739 | int ret; |
e23ccc0a PO |
740 | |
741 | if (b->type != q->type) { | |
fd4354cf | 742 | dprintk(1, "wrong buffer type\n"); |
e23ccc0a PO |
743 | return -EINVAL; |
744 | } | |
745 | ||
746 | if (b->index >= q->num_buffers) { | |
fd4354cf | 747 | dprintk(1, "buffer index out of range\n"); |
e23ccc0a PO |
748 | return -EINVAL; |
749 | } | |
750 | vb = q->bufs[b->index]; | |
32a77260 HV |
751 | ret = __verify_planes_array(vb, b); |
752 | if (!ret) | |
753 | __fill_v4l2_buffer(vb, b); | |
754 | return ret; | |
e23ccc0a PO |
755 | } |
756 | EXPORT_SYMBOL(vb2_querybuf); | |
757 | ||
758 | /** | |
759 | * __verify_userptr_ops() - verify that all memory operations required for | |
760 | * USERPTR queue type have been provided | |
761 | */ | |
762 | static int __verify_userptr_ops(struct vb2_queue *q) | |
763 | { | |
764 | if (!(q->io_modes & VB2_USERPTR) || !q->mem_ops->get_userptr || | |
765 | !q->mem_ops->put_userptr) | |
766 | return -EINVAL; | |
767 | ||
768 | return 0; | |
769 | } | |
770 | ||
771 | /** | |
772 | * __verify_mmap_ops() - verify that all memory operations required for | |
773 | * MMAP queue type have been provided | |
774 | */ | |
775 | static int __verify_mmap_ops(struct vb2_queue *q) | |
776 | { | |
777 | if (!(q->io_modes & VB2_MMAP) || !q->mem_ops->alloc || | |
778 | !q->mem_ops->put || !q->mem_ops->mmap) | |
779 | return -EINVAL; | |
780 | ||
781 | return 0; | |
782 | } | |
783 | ||
c5384048 SS |
784 | /** |
785 | * __verify_dmabuf_ops() - verify that all memory operations required for | |
786 | * DMABUF queue type have been provided | |
787 | */ | |
788 | static int __verify_dmabuf_ops(struct vb2_queue *q) | |
789 | { | |
790 | if (!(q->io_modes & VB2_DMABUF) || !q->mem_ops->attach_dmabuf || | |
791 | !q->mem_ops->detach_dmabuf || !q->mem_ops->map_dmabuf || | |
792 | !q->mem_ops->unmap_dmabuf) | |
793 | return -EINVAL; | |
794 | ||
795 | return 0; | |
796 | } | |
797 | ||
e23ccc0a | 798 | /** |
37d9ed94 HV |
799 | * __verify_memory_type() - Check whether the memory type and buffer type |
800 | * passed to a buffer operation are compatible with the queue. | |
801 | */ | |
802 | static int __verify_memory_type(struct vb2_queue *q, | |
803 | enum v4l2_memory memory, enum v4l2_buf_type type) | |
804 | { | |
c5384048 SS |
805 | if (memory != V4L2_MEMORY_MMAP && memory != V4L2_MEMORY_USERPTR && |
806 | memory != V4L2_MEMORY_DMABUF) { | |
fd4354cf | 807 | dprintk(1, "unsupported memory type\n"); |
37d9ed94 HV |
808 | return -EINVAL; |
809 | } | |
810 | ||
811 | if (type != q->type) { | |
fd4354cf | 812 | dprintk(1, "requested type is incorrect\n"); |
37d9ed94 HV |
813 | return -EINVAL; |
814 | } | |
815 | ||
816 | /* | |
817 | * Make sure all the required memory ops for given memory type | |
818 | * are available. | |
819 | */ | |
820 | if (memory == V4L2_MEMORY_MMAP && __verify_mmap_ops(q)) { | |
fd4354cf | 821 | dprintk(1, "MMAP for current setup unsupported\n"); |
37d9ed94 HV |
822 | return -EINVAL; |
823 | } | |
824 | ||
825 | if (memory == V4L2_MEMORY_USERPTR && __verify_userptr_ops(q)) { | |
fd4354cf | 826 | dprintk(1, "USERPTR for current setup unsupported\n"); |
37d9ed94 HV |
827 | return -EINVAL; |
828 | } | |
829 | ||
c5384048 | 830 | if (memory == V4L2_MEMORY_DMABUF && __verify_dmabuf_ops(q)) { |
fd4354cf | 831 | dprintk(1, "DMABUF for current setup unsupported\n"); |
c5384048 SS |
832 | return -EINVAL; |
833 | } | |
834 | ||
37d9ed94 HV |
835 | /* |
836 | * Place the busy tests at the end: -EBUSY can be ignored when | |
837 | * create_bufs is called with count == 0, but count == 0 should still | |
838 | * do the memory and type validation. | |
839 | */ | |
74753cff | 840 | if (vb2_fileio_is_active(q)) { |
fd4354cf | 841 | dprintk(1, "file io in progress\n"); |
37d9ed94 HV |
842 | return -EBUSY; |
843 | } | |
844 | return 0; | |
845 | } | |
846 | ||
847 | /** | |
848 | * __reqbufs() - Initiate streaming | |
e23ccc0a PO |
849 | * @q: videobuf2 queue |
850 | * @req: struct passed from userspace to vidioc_reqbufs handler in driver | |
851 | * | |
852 | * Should be called from vidioc_reqbufs ioctl handler of a driver. | |
853 | * This function: | |
854 | * 1) verifies streaming parameters passed from the userspace, | |
855 | * 2) sets up the queue, | |
856 | * 3) negotiates number of buffers and planes per buffer with the driver | |
857 | * to be used during streaming, | |
858 | * 4) allocates internal buffer structures (struct vb2_buffer), according to | |
859 | * the agreed parameters, | |
860 | * 5) for MMAP memory type, allocates actual video memory, using the | |
861 | * memory handling/allocation routines provided during queue initialization | |
862 | * | |
863 | * If req->count is 0, all the memory will be freed instead. | |
864 | * If the queue has been allocated previously (by a previous vb2_reqbufs) call | |
865 | * and the queue is not busy, memory will be reallocated. | |
866 | * | |
867 | * The return values from this function are intended to be directly returned | |
868 | * from vidioc_reqbufs handler in driver. | |
869 | */ | |
37d9ed94 | 870 | static int __reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req) |
e23ccc0a | 871 | { |
2d86401c | 872 | unsigned int num_buffers, allocated_buffers, num_planes = 0; |
37d9ed94 | 873 | int ret; |
e23ccc0a PO |
874 | |
875 | if (q->streaming) { | |
fd4354cf | 876 | dprintk(1, "streaming active\n"); |
e23ccc0a PO |
877 | return -EBUSY; |
878 | } | |
879 | ||
29e3fbd8 | 880 | if (req->count == 0 || q->num_buffers != 0 || q->memory != req->memory) { |
e23ccc0a PO |
881 | /* |
882 | * We already have buffers allocated, so first check if they | |
883 | * are not in use and can be freed. | |
884 | */ | |
885 | if (q->memory == V4L2_MEMORY_MMAP && __buffers_in_use(q)) { | |
fd4354cf | 886 | dprintk(1, "memory in use, cannot free\n"); |
e23ccc0a PO |
887 | return -EBUSY; |
888 | } | |
889 | ||
fb64dca8 HV |
890 | /* |
891 | * Call queue_cancel to clean up any buffers in the PREPARED or | |
892 | * QUEUED state which is possible if buffers were prepared or | |
893 | * queued without ever calling STREAMON. | |
894 | */ | |
895 | __vb2_queue_cancel(q); | |
63faabfd HV |
896 | ret = __vb2_queue_free(q, q->num_buffers); |
897 | if (ret) | |
898 | return ret; | |
29e3fbd8 MS |
899 | |
900 | /* | |
901 | * In case of REQBUFS(0) return immediately without calling | |
902 | * driver's queue_setup() callback and allocating resources. | |
903 | */ | |
904 | if (req->count == 0) | |
905 | return 0; | |
e23ccc0a PO |
906 | } |
907 | ||
908 | /* | |
909 | * Make sure the requested values and current defaults are sane. | |
910 | */ | |
911 | num_buffers = min_t(unsigned int, req->count, VIDEO_MAX_FRAME); | |
4cf743de | 912 | num_buffers = max_t(unsigned int, num_buffers, q->min_buffers_needed); |
c1426bc7 | 913 | memset(q->plane_sizes, 0, sizeof(q->plane_sizes)); |
e23ccc0a | 914 | memset(q->alloc_ctx, 0, sizeof(q->alloc_ctx)); |
13b14095 | 915 | q->memory = req->memory; |
e23ccc0a PO |
916 | |
917 | /* | |
918 | * Ask the driver how many buffers and planes per buffer it requires. | |
919 | * Driver also sets the size and allocator context for each plane. | |
920 | */ | |
fc714e70 | 921 | ret = call_qop(q, queue_setup, q, NULL, &num_buffers, &num_planes, |
c1426bc7 | 922 | q->plane_sizes, q->alloc_ctx); |
a1d36d8c | 923 | if (ret) |
e23ccc0a PO |
924 | return ret; |
925 | ||
926 | /* Finally, allocate buffers and video memory */ | |
a7afcacc HV |
927 | allocated_buffers = __vb2_queue_alloc(q, req->memory, num_buffers, num_planes); |
928 | if (allocated_buffers == 0) { | |
3050040b | 929 | dprintk(1, "memory allocation failed\n"); |
66072d4f | 930 | return -ENOMEM; |
e23ccc0a PO |
931 | } |
932 | ||
b3379c62 HV |
933 | /* |
934 | * There is no point in continuing if we can't allocate the minimum | |
935 | * number of buffers needed by this vb2_queue. | |
936 | */ | |
937 | if (allocated_buffers < q->min_buffers_needed) | |
938 | ret = -ENOMEM; | |
939 | ||
e23ccc0a PO |
940 | /* |
941 | * Check if driver can handle the allocated number of buffers. | |
942 | */ | |
b3379c62 | 943 | if (!ret && allocated_buffers < num_buffers) { |
2d86401c | 944 | num_buffers = allocated_buffers; |
e23ccc0a | 945 | |
fc714e70 GL |
946 | ret = call_qop(q, queue_setup, q, NULL, &num_buffers, |
947 | &num_planes, q->plane_sizes, q->alloc_ctx); | |
e23ccc0a | 948 | |
2d86401c | 949 | if (!ret && allocated_buffers < num_buffers) |
e23ccc0a | 950 | ret = -ENOMEM; |
e23ccc0a PO |
951 | |
952 | /* | |
2d86401c GL |
953 | * Either the driver has accepted a smaller number of buffers, |
954 | * or .queue_setup() returned an error | |
e23ccc0a | 955 | */ |
2d86401c GL |
956 | } |
957 | ||
958 | q->num_buffers = allocated_buffers; | |
959 | ||
960 | if (ret < 0) { | |
a7afcacc HV |
961 | /* |
962 | * Note: __vb2_queue_free() will subtract 'allocated_buffers' | |
963 | * from q->num_buffers. | |
964 | */ | |
2d86401c GL |
965 | __vb2_queue_free(q, allocated_buffers); |
966 | return ret; | |
e23ccc0a PO |
967 | } |
968 | ||
e23ccc0a PO |
969 | /* |
970 | * Return the number of successfully allocated buffers | |
971 | * to the userspace. | |
972 | */ | |
2d86401c | 973 | req->count = allocated_buffers; |
e23ccc0a PO |
974 | |
975 | return 0; | |
e23ccc0a | 976 | } |
37d9ed94 HV |
977 | |
978 | /** | |
979 | * vb2_reqbufs() - Wrapper for __reqbufs() that also verifies the memory and | |
980 | * type values. | |
981 | * @q: videobuf2 queue | |
982 | * @req: struct passed from userspace to vidioc_reqbufs handler in driver | |
983 | */ | |
984 | int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req) | |
985 | { | |
986 | int ret = __verify_memory_type(q, req->memory, req->type); | |
987 | ||
988 | return ret ? ret : __reqbufs(q, req); | |
989 | } | |
e23ccc0a PO |
990 | EXPORT_SYMBOL_GPL(vb2_reqbufs); |
991 | ||
2d86401c | 992 | /** |
37d9ed94 | 993 | * __create_bufs() - Allocate buffers and any required auxiliary structs |
2d86401c GL |
994 | * @q: videobuf2 queue |
995 | * @create: creation parameters, passed from userspace to vidioc_create_bufs | |
996 | * handler in driver | |
997 | * | |
998 | * Should be called from vidioc_create_bufs ioctl handler of a driver. | |
999 | * This function: | |
1000 | * 1) verifies parameter sanity | |
1001 | * 2) calls the .queue_setup() queue operation | |
1002 | * 3) performs any necessary memory allocations | |
1003 | * | |
1004 | * The return values from this function are intended to be directly returned | |
1005 | * from vidioc_create_bufs handler in driver. | |
1006 | */ | |
37d9ed94 | 1007 | static int __create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) |
2d86401c GL |
1008 | { |
1009 | unsigned int num_planes = 0, num_buffers, allocated_buffers; | |
37d9ed94 | 1010 | int ret; |
2d86401c GL |
1011 | |
1012 | if (q->num_buffers == VIDEO_MAX_FRAME) { | |
fd4354cf | 1013 | dprintk(1, "maximum number of buffers already allocated\n"); |
2d86401c GL |
1014 | return -ENOBUFS; |
1015 | } | |
1016 | ||
2d86401c GL |
1017 | if (!q->num_buffers) { |
1018 | memset(q->plane_sizes, 0, sizeof(q->plane_sizes)); | |
1019 | memset(q->alloc_ctx, 0, sizeof(q->alloc_ctx)); | |
1020 | q->memory = create->memory; | |
1021 | } | |
1022 | ||
1023 | num_buffers = min(create->count, VIDEO_MAX_FRAME - q->num_buffers); | |
1024 | ||
1025 | /* | |
1026 | * Ask the driver, whether the requested number of buffers, planes per | |
1027 | * buffer and their sizes are acceptable | |
1028 | */ | |
1029 | ret = call_qop(q, queue_setup, q, &create->format, &num_buffers, | |
1030 | &num_planes, q->plane_sizes, q->alloc_ctx); | |
a1d36d8c | 1031 | if (ret) |
2d86401c GL |
1032 | return ret; |
1033 | ||
1034 | /* Finally, allocate buffers and video memory */ | |
a7afcacc | 1035 | allocated_buffers = __vb2_queue_alloc(q, create->memory, num_buffers, |
2d86401c | 1036 | num_planes); |
a7afcacc | 1037 | if (allocated_buffers == 0) { |
3050040b | 1038 | dprintk(1, "memory allocation failed\n"); |
f05393d2 | 1039 | return -ENOMEM; |
2d86401c GL |
1040 | } |
1041 | ||
2d86401c GL |
1042 | /* |
1043 | * Check if driver can handle the so far allocated number of buffers. | |
1044 | */ | |
a7afcacc HV |
1045 | if (allocated_buffers < num_buffers) { |
1046 | num_buffers = allocated_buffers; | |
2d86401c GL |
1047 | |
1048 | /* | |
1049 | * q->num_buffers contains the total number of buffers, that the | |
1050 | * queue driver has set up | |
1051 | */ | |
1052 | ret = call_qop(q, queue_setup, q, &create->format, &num_buffers, | |
1053 | &num_planes, q->plane_sizes, q->alloc_ctx); | |
1054 | ||
1055 | if (!ret && allocated_buffers < num_buffers) | |
1056 | ret = -ENOMEM; | |
1057 | ||
1058 | /* | |
1059 | * Either the driver has accepted a smaller number of buffers, | |
1060 | * or .queue_setup() returned an error | |
1061 | */ | |
1062 | } | |
1063 | ||
1064 | q->num_buffers += allocated_buffers; | |
1065 | ||
1066 | if (ret < 0) { | |
a7afcacc HV |
1067 | /* |
1068 | * Note: __vb2_queue_free() will subtract 'allocated_buffers' | |
1069 | * from q->num_buffers. | |
1070 | */ | |
2d86401c | 1071 | __vb2_queue_free(q, allocated_buffers); |
f05393d2 | 1072 | return -ENOMEM; |
2d86401c GL |
1073 | } |
1074 | ||
1075 | /* | |
1076 | * Return the number of successfully allocated buffers | |
1077 | * to the userspace. | |
1078 | */ | |
1079 | create->count = allocated_buffers; | |
1080 | ||
1081 | return 0; | |
1082 | } | |
37d9ed94 HV |
1083 | |
1084 | /** | |
53aa3b19 NT |
1085 | * vb2_create_bufs() - Wrapper for __create_bufs() that also verifies the |
1086 | * memory and type values. | |
37d9ed94 HV |
1087 | * @q: videobuf2 queue |
1088 | * @create: creation parameters, passed from userspace to vidioc_create_bufs | |
1089 | * handler in driver | |
1090 | */ | |
1091 | int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) | |
1092 | { | |
1093 | int ret = __verify_memory_type(q, create->memory, create->format.type); | |
1094 | ||
1095 | create->index = q->num_buffers; | |
f05393d2 HV |
1096 | if (create->count == 0) |
1097 | return ret != -EBUSY ? ret : 0; | |
37d9ed94 HV |
1098 | return ret ? ret : __create_bufs(q, create); |
1099 | } | |
2d86401c GL |
1100 | EXPORT_SYMBOL_GPL(vb2_create_bufs); |
1101 | ||
e23ccc0a PO |
1102 | /** |
1103 | * vb2_plane_vaddr() - Return a kernel virtual address of a given plane | |
1104 | * @vb: vb2_buffer to which the plane in question belongs to | |
1105 | * @plane_no: plane number for which the address is to be returned | |
1106 | * | |
1107 | * This function returns a kernel virtual address of a given plane if | |
1108 | * such a mapping exist, NULL otherwise. | |
1109 | */ | |
1110 | void *vb2_plane_vaddr(struct vb2_buffer *vb, unsigned int plane_no) | |
1111 | { | |
a00d0266 | 1112 | if (plane_no > vb->num_planes || !vb->planes[plane_no].mem_priv) |
e23ccc0a PO |
1113 | return NULL; |
1114 | ||
a1d36d8c | 1115 | return call_ptr_memop(vb, vaddr, vb->planes[plane_no].mem_priv); |
e23ccc0a PO |
1116 | |
1117 | } | |
1118 | EXPORT_SYMBOL_GPL(vb2_plane_vaddr); | |
1119 | ||
1120 | /** | |
1121 | * vb2_plane_cookie() - Return allocator specific cookie for the given plane | |
1122 | * @vb: vb2_buffer to which the plane in question belongs to | |
1123 | * @plane_no: plane number for which the cookie is to be returned | |
1124 | * | |
1125 | * This function returns an allocator specific cookie for a given plane if | |
1126 | * available, NULL otherwise. The allocator should provide some simple static | |
1127 | * inline function, which would convert this cookie to the allocator specific | |
1128 | * type that can be used directly by the driver to access the buffer. This can | |
1129 | * be for example physical address, pointer to scatter list or IOMMU mapping. | |
1130 | */ | |
1131 | void *vb2_plane_cookie(struct vb2_buffer *vb, unsigned int plane_no) | |
1132 | { | |
a00d0266 | 1133 | if (plane_no > vb->num_planes || !vb->planes[plane_no].mem_priv) |
e23ccc0a PO |
1134 | return NULL; |
1135 | ||
a1d36d8c | 1136 | return call_ptr_memop(vb, cookie, vb->planes[plane_no].mem_priv); |
e23ccc0a PO |
1137 | } |
1138 | EXPORT_SYMBOL_GPL(vb2_plane_cookie); | |
1139 | ||
1140 | /** | |
1141 | * vb2_buffer_done() - inform videobuf that an operation on a buffer is finished | |
1142 | * @vb: vb2_buffer returned from the driver | |
1143 | * @state: either VB2_BUF_STATE_DONE if the operation finished successfully | |
b3379c62 HV |
1144 | * or VB2_BUF_STATE_ERROR if the operation finished with an error. |
1145 | * If start_streaming fails then it should return buffers with state | |
1146 | * VB2_BUF_STATE_QUEUED to put them back into the queue. | |
e23ccc0a PO |
1147 | * |
1148 | * This function should be called by the driver after a hardware operation on | |
1149 | * a buffer is finished and the buffer may be returned to userspace. The driver | |
1150 | * cannot use this buffer anymore until it is queued back to it by videobuf | |
1151 | * by the means of buf_queue callback. Only buffers previously queued to the | |
1152 | * driver by buf_queue can be passed to this function. | |
b3379c62 HV |
1153 | * |
1154 | * While streaming a buffer can only be returned in state DONE or ERROR. | |
1155 | * The start_streaming op can also return them in case the DMA engine cannot | |
1156 | * be started for some reason. In that case the buffers should be returned with | |
1157 | * state QUEUED. | |
e23ccc0a PO |
1158 | */ |
1159 | void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state) | |
1160 | { | |
1161 | struct vb2_queue *q = vb->vb2_queue; | |
1162 | unsigned long flags; | |
3e0c2f20 | 1163 | unsigned int plane; |
e23ccc0a | 1164 | |
b3379c62 | 1165 | if (WARN_ON(vb->state != VB2_BUF_STATE_ACTIVE)) |
e23ccc0a PO |
1166 | return; |
1167 | ||
b3379c62 HV |
1168 | if (!q->start_streaming_called) { |
1169 | if (WARN_ON(state != VB2_BUF_STATE_QUEUED)) | |
1170 | state = VB2_BUF_STATE_QUEUED; | |
57394b72 HV |
1171 | } else if (WARN_ON(state != VB2_BUF_STATE_DONE && |
1172 | state != VB2_BUF_STATE_ERROR)) { | |
b3379c62 HV |
1173 | state = VB2_BUF_STATE_ERROR; |
1174 | } | |
e23ccc0a | 1175 | |
b5b4541e HV |
1176 | #ifdef CONFIG_VIDEO_ADV_DEBUG |
1177 | /* | |
1178 | * Although this is not a callback, it still does have to balance | |
1179 | * with the buf_queue op. So update this counter manually. | |
1180 | */ | |
1181 | vb->cnt_buf_done++; | |
1182 | #endif | |
3050040b | 1183 | dprintk(4, "done processing on buffer %d, state: %d\n", |
9b6f5dc0 | 1184 | vb->v4l2_buf.index, state); |
e23ccc0a | 1185 | |
3e0c2f20 MS |
1186 | /* sync buffers */ |
1187 | for (plane = 0; plane < vb->num_planes; ++plane) | |
a1d36d8c | 1188 | call_void_memop(vb, finish, vb->planes[plane].mem_priv); |
3e0c2f20 | 1189 | |
e23ccc0a PO |
1190 | /* Add the buffer to the done buffers list */ |
1191 | spin_lock_irqsave(&q->done_lock, flags); | |
1192 | vb->state = state; | |
b3379c62 HV |
1193 | if (state != VB2_BUF_STATE_QUEUED) |
1194 | list_add_tail(&vb->done_entry, &q->done_list); | |
6ea3b980 | 1195 | atomic_dec(&q->owned_by_drv_count); |
e23ccc0a PO |
1196 | spin_unlock_irqrestore(&q->done_lock, flags); |
1197 | ||
b3379c62 HV |
1198 | if (state == VB2_BUF_STATE_QUEUED) |
1199 | return; | |
1200 | ||
e23ccc0a PO |
1201 | /* Inform any processes that may be waiting for buffers */ |
1202 | wake_up(&q->done_wq); | |
1203 | } | |
1204 | EXPORT_SYMBOL_GPL(vb2_buffer_done); | |
1205 | ||
34ea4d44 LP |
1206 | /** |
1207 | * vb2_discard_done() - discard all buffers marked as DONE | |
1208 | * @q: videobuf2 queue | |
1209 | * | |
1210 | * This function is intended to be used with suspend/resume operations. It | |
1211 | * discards all 'done' buffers as they would be too old to be requested after | |
1212 | * resume. | |
1213 | * | |
1214 | * Drivers must stop the hardware and synchronize with interrupt handlers and/or | |
1215 | * delayed works before calling this function to make sure no buffer will be | |
1216 | * touched by the driver and/or hardware. | |
1217 | */ | |
1218 | void vb2_discard_done(struct vb2_queue *q) | |
1219 | { | |
1220 | struct vb2_buffer *vb; | |
1221 | unsigned long flags; | |
1222 | ||
1223 | spin_lock_irqsave(&q->done_lock, flags); | |
1224 | list_for_each_entry(vb, &q->done_list, done_entry) | |
1225 | vb->state = VB2_BUF_STATE_ERROR; | |
1226 | spin_unlock_irqrestore(&q->done_lock, flags); | |
1227 | } | |
1228 | EXPORT_SYMBOL_GPL(vb2_discard_done); | |
1229 | ||
e23ccc0a | 1230 | /** |
32a77260 HV |
1231 | * __fill_vb2_buffer() - fill a vb2_buffer with information provided in a |
1232 | * v4l2_buffer by the userspace. The caller has already verified that struct | |
1233 | * v4l2_buffer has a valid number of planes. | |
e23ccc0a | 1234 | */ |
32a77260 | 1235 | static void __fill_vb2_buffer(struct vb2_buffer *vb, const struct v4l2_buffer *b, |
e23ccc0a PO |
1236 | struct v4l2_plane *v4l2_planes) |
1237 | { | |
1238 | unsigned int plane; | |
e23ccc0a PO |
1239 | |
1240 | if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) { | |
e23ccc0a PO |
1241 | if (b->memory == V4L2_MEMORY_USERPTR) { |
1242 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
1243 | v4l2_planes[plane].m.userptr = | |
1244 | b->m.planes[plane].m.userptr; | |
1245 | v4l2_planes[plane].length = | |
1246 | b->m.planes[plane].length; | |
1247 | } | |
1248 | } | |
c5384048 SS |
1249 | if (b->memory == V4L2_MEMORY_DMABUF) { |
1250 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
1251 | v4l2_planes[plane].m.fd = | |
1252 | b->m.planes[plane].m.fd; | |
1253 | v4l2_planes[plane].length = | |
1254 | b->m.planes[plane].length; | |
c5384048 SS |
1255 | } |
1256 | } | |
8a75ffb8 HV |
1257 | |
1258 | /* Fill in driver-provided information for OUTPUT types */ | |
1259 | if (V4L2_TYPE_IS_OUTPUT(b->type)) { | |
1260 | /* | |
1261 | * Will have to go up to b->length when API starts | |
1262 | * accepting variable number of planes. | |
1263 | * | |
1264 | * If bytesused == 0 for the output buffer, then fall | |
1265 | * back to the full buffer size. In that case | |
1266 | * userspace clearly never bothered to set it and | |
1267 | * it's a safe assumption that they really meant to | |
1268 | * use the full plane sizes. | |
1269 | */ | |
1270 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
1271 | struct v4l2_plane *pdst = &v4l2_planes[plane]; | |
1272 | struct v4l2_plane *psrc = &b->m.planes[plane]; | |
1273 | ||
1274 | pdst->bytesused = psrc->bytesused ? | |
1275 | psrc->bytesused : pdst->length; | |
1276 | pdst->data_offset = psrc->data_offset; | |
1277 | } | |
1278 | } | |
e23ccc0a PO |
1279 | } else { |
1280 | /* | |
1281 | * Single-planar buffers do not use planes array, | |
1282 | * so fill in relevant v4l2_buffer struct fields instead. | |
1283 | * In videobuf we use our internal V4l2_planes struct for | |
1284 | * single-planar buffers as well, for simplicity. | |
61bd8fb3 | 1285 | * |
8a75ffb8 HV |
1286 | * If bytesused == 0 for the output buffer, then fall back |
1287 | * to the full buffer size as that's a sensible default. | |
e23ccc0a | 1288 | */ |
e23ccc0a PO |
1289 | if (b->memory == V4L2_MEMORY_USERPTR) { |
1290 | v4l2_planes[0].m.userptr = b->m.userptr; | |
1291 | v4l2_planes[0].length = b->length; | |
1292 | } | |
c5384048 SS |
1293 | |
1294 | if (b->memory == V4L2_MEMORY_DMABUF) { | |
1295 | v4l2_planes[0].m.fd = b->m.fd; | |
1296 | v4l2_planes[0].length = b->length; | |
c5384048 | 1297 | } |
8a75ffb8 HV |
1298 | |
1299 | if (V4L2_TYPE_IS_OUTPUT(b->type)) | |
1300 | v4l2_planes[0].bytesused = b->bytesused ? | |
1301 | b->bytesused : v4l2_planes[0].length; | |
1302 | else | |
1303 | v4l2_planes[0].bytesused = 0; | |
1304 | ||
e23ccc0a PO |
1305 | } |
1306 | ||
f1343281 | 1307 | /* Zero flags that the vb2 core handles */ |
1b18e7a0 | 1308 | vb->v4l2_buf.flags = b->flags & ~V4L2_BUFFER_MASK_FLAGS; |
7ce6fd8f SA |
1309 | if ((vb->vb2_queue->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) != |
1310 | V4L2_BUF_FLAG_TIMESTAMP_COPY || !V4L2_TYPE_IS_OUTPUT(b->type)) { | |
1311 | /* | |
1312 | * Non-COPY timestamps and non-OUTPUT queues will get | |
1313 | * their timestamp and timestamp source flags from the | |
1314 | * queue. | |
1315 | */ | |
1316 | vb->v4l2_buf.flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK; | |
1317 | } | |
1318 | ||
f1343281 HV |
1319 | if (V4L2_TYPE_IS_OUTPUT(b->type)) { |
1320 | /* | |
1321 | * For output buffers mask out the timecode flag: | |
1322 | * this will be handled later in vb2_internal_qbuf(). | |
1323 | * The 'field' is valid metadata for this output buffer | |
1324 | * and so that needs to be copied here. | |
1325 | */ | |
1326 | vb->v4l2_buf.flags &= ~V4L2_BUF_FLAG_TIMECODE; | |
1327 | vb->v4l2_buf.field = b->field; | |
1328 | } else { | |
1329 | /* Zero any output buffer flags as this is a capture buffer */ | |
1330 | vb->v4l2_buf.flags &= ~V4L2_BUFFER_OUT_FLAGS; | |
1331 | } | |
e23ccc0a PO |
1332 | } |
1333 | ||
dcc2428a HV |
1334 | /** |
1335 | * __qbuf_mmap() - handle qbuf of an MMAP buffer | |
1336 | */ | |
1337 | static int __qbuf_mmap(struct vb2_buffer *vb, const struct v4l2_buffer *b) | |
1338 | { | |
1339 | __fill_vb2_buffer(vb, b, vb->v4l2_planes); | |
1340 | return call_vb_qop(vb, buf_prepare, vb); | |
1341 | } | |
1342 | ||
e23ccc0a PO |
1343 | /** |
1344 | * __qbuf_userptr() - handle qbuf of a USERPTR buffer | |
1345 | */ | |
2d86401c | 1346 | static int __qbuf_userptr(struct vb2_buffer *vb, const struct v4l2_buffer *b) |
e23ccc0a PO |
1347 | { |
1348 | struct v4l2_plane planes[VIDEO_MAX_PLANES]; | |
1349 | struct vb2_queue *q = vb->vb2_queue; | |
1350 | void *mem_priv; | |
1351 | unsigned int plane; | |
1352 | int ret; | |
1353 | int write = !V4L2_TYPE_IS_OUTPUT(q->type); | |
256f3162 | 1354 | bool reacquired = vb->planes[0].mem_priv == NULL; |
e23ccc0a | 1355 | |
412376a1 | 1356 | memset(planes, 0, sizeof(planes[0]) * vb->num_planes); |
32a77260 HV |
1357 | /* Copy relevant information provided by the userspace */ |
1358 | __fill_vb2_buffer(vb, b, planes); | |
e23ccc0a PO |
1359 | |
1360 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
1361 | /* Skip the plane if already verified */ | |
f0b7c7fc MS |
1362 | if (vb->v4l2_planes[plane].m.userptr && |
1363 | vb->v4l2_planes[plane].m.userptr == planes[plane].m.userptr | |
e23ccc0a PO |
1364 | && vb->v4l2_planes[plane].length == planes[plane].length) |
1365 | continue; | |
1366 | ||
fd4354cf | 1367 | dprintk(3, "userspace address for plane %d changed, " |
e23ccc0a PO |
1368 | "reacquiring memory\n", plane); |
1369 | ||
c1426bc7 MS |
1370 | /* Check if the provided plane buffer is large enough */ |
1371 | if (planes[plane].length < q->plane_sizes[plane]) { | |
fd4354cf | 1372 | dprintk(1, "provided buffer size %u is less than " |
2484a7e2 SWK |
1373 | "setup size %u for plane %d\n", |
1374 | planes[plane].length, | |
1375 | q->plane_sizes[plane], plane); | |
4c2625db | 1376 | ret = -EINVAL; |
c1426bc7 MS |
1377 | goto err; |
1378 | } | |
1379 | ||
e23ccc0a | 1380 | /* Release previously acquired memory if present */ |
256f3162 HV |
1381 | if (vb->planes[plane].mem_priv) { |
1382 | if (!reacquired) { | |
1383 | reacquired = true; | |
a1d36d8c | 1384 | call_void_vb_qop(vb, buf_cleanup, vb); |
256f3162 | 1385 | } |
a1d36d8c | 1386 | call_void_memop(vb, put_userptr, vb->planes[plane].mem_priv); |
256f3162 | 1387 | } |
e23ccc0a PO |
1388 | |
1389 | vb->planes[plane].mem_priv = NULL; | |
256f3162 | 1390 | memset(&vb->v4l2_planes[plane], 0, sizeof(struct v4l2_plane)); |
e23ccc0a PO |
1391 | |
1392 | /* Acquire each plane's memory */ | |
a1d36d8c | 1393 | mem_priv = call_ptr_memop(vb, get_userptr, q->alloc_ctx[plane], |
a00d0266 MS |
1394 | planes[plane].m.userptr, |
1395 | planes[plane].length, write); | |
1396 | if (IS_ERR_OR_NULL(mem_priv)) { | |
fd4354cf | 1397 | dprintk(1, "failed acquiring userspace " |
e23ccc0a | 1398 | "memory for plane %d\n", plane); |
a00d0266 MS |
1399 | ret = mem_priv ? PTR_ERR(mem_priv) : -EINVAL; |
1400 | goto err; | |
e23ccc0a | 1401 | } |
a00d0266 | 1402 | vb->planes[plane].mem_priv = mem_priv; |
e23ccc0a PO |
1403 | } |
1404 | ||
e23ccc0a PO |
1405 | /* |
1406 | * Now that everything is in order, copy relevant information | |
1407 | * provided by userspace. | |
1408 | */ | |
1409 | for (plane = 0; plane < vb->num_planes; ++plane) | |
1410 | vb->v4l2_planes[plane] = planes[plane]; | |
1411 | ||
256f3162 HV |
1412 | if (reacquired) { |
1413 | /* | |
1414 | * One or more planes changed, so we must call buf_init to do | |
1415 | * the driver-specific initialization on the newly acquired | |
1416 | * buffer, if provided. | |
1417 | */ | |
1418 | ret = call_vb_qop(vb, buf_init, vb); | |
1419 | if (ret) { | |
fd4354cf | 1420 | dprintk(1, "buffer initialization failed\n"); |
256f3162 HV |
1421 | goto err; |
1422 | } | |
1423 | } | |
1424 | ||
1425 | ret = call_vb_qop(vb, buf_prepare, vb); | |
1426 | if (ret) { | |
fd4354cf | 1427 | dprintk(1, "buffer preparation failed\n"); |
a1d36d8c | 1428 | call_void_vb_qop(vb, buf_cleanup, vb); |
256f3162 HV |
1429 | goto err; |
1430 | } | |
1431 | ||
e23ccc0a PO |
1432 | return 0; |
1433 | err: | |
1434 | /* In case of errors, release planes that were already acquired */ | |
c1426bc7 MS |
1435 | for (plane = 0; plane < vb->num_planes; ++plane) { |
1436 | if (vb->planes[plane].mem_priv) | |
a1d36d8c | 1437 | call_void_memop(vb, put_userptr, vb->planes[plane].mem_priv); |
c1426bc7 MS |
1438 | vb->planes[plane].mem_priv = NULL; |
1439 | vb->v4l2_planes[plane].m.userptr = 0; | |
1440 | vb->v4l2_planes[plane].length = 0; | |
e23ccc0a PO |
1441 | } |
1442 | ||
1443 | return ret; | |
1444 | } | |
1445 | ||
c5384048 SS |
1446 | /** |
1447 | * __qbuf_dmabuf() - handle qbuf of a DMABUF buffer | |
1448 | */ | |
1449 | static int __qbuf_dmabuf(struct vb2_buffer *vb, const struct v4l2_buffer *b) | |
1450 | { | |
1451 | struct v4l2_plane planes[VIDEO_MAX_PLANES]; | |
1452 | struct vb2_queue *q = vb->vb2_queue; | |
1453 | void *mem_priv; | |
1454 | unsigned int plane; | |
1455 | int ret; | |
1456 | int write = !V4L2_TYPE_IS_OUTPUT(q->type); | |
256f3162 | 1457 | bool reacquired = vb->planes[0].mem_priv == NULL; |
c5384048 | 1458 | |
412376a1 | 1459 | memset(planes, 0, sizeof(planes[0]) * vb->num_planes); |
6f546c5f | 1460 | /* Copy relevant information provided by the userspace */ |
c5384048 SS |
1461 | __fill_vb2_buffer(vb, b, planes); |
1462 | ||
1463 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
1464 | struct dma_buf *dbuf = dma_buf_get(planes[plane].m.fd); | |
1465 | ||
1466 | if (IS_ERR_OR_NULL(dbuf)) { | |
fd4354cf | 1467 | dprintk(1, "invalid dmabuf fd for plane %d\n", |
c5384048 SS |
1468 | plane); |
1469 | ret = -EINVAL; | |
1470 | goto err; | |
1471 | } | |
1472 | ||
1473 | /* use DMABUF size if length is not provided */ | |
1474 | if (planes[plane].length == 0) | |
1475 | planes[plane].length = dbuf->size; | |
1476 | ||
412376a1 | 1477 | if (planes[plane].length < q->plane_sizes[plane]) { |
fd4354cf | 1478 | dprintk(1, "invalid dmabuf length for plane %d\n", |
77c0782e | 1479 | plane); |
c5384048 SS |
1480 | ret = -EINVAL; |
1481 | goto err; | |
1482 | } | |
1483 | ||
1484 | /* Skip the plane if already verified */ | |
1485 | if (dbuf == vb->planes[plane].dbuf && | |
1486 | vb->v4l2_planes[plane].length == planes[plane].length) { | |
1487 | dma_buf_put(dbuf); | |
1488 | continue; | |
1489 | } | |
1490 | ||
fd4354cf | 1491 | dprintk(1, "buffer for plane %d changed\n", plane); |
c5384048 | 1492 | |
256f3162 HV |
1493 | if (!reacquired) { |
1494 | reacquired = true; | |
a1d36d8c | 1495 | call_void_vb_qop(vb, buf_cleanup, vb); |
256f3162 HV |
1496 | } |
1497 | ||
c5384048 | 1498 | /* Release previously acquired memory if present */ |
b5b4541e | 1499 | __vb2_plane_dmabuf_put(vb, &vb->planes[plane]); |
c5384048 SS |
1500 | memset(&vb->v4l2_planes[plane], 0, sizeof(struct v4l2_plane)); |
1501 | ||
1502 | /* Acquire each plane's memory */ | |
a1d36d8c | 1503 | mem_priv = call_ptr_memop(vb, attach_dmabuf, q->alloc_ctx[plane], |
c5384048 SS |
1504 | dbuf, planes[plane].length, write); |
1505 | if (IS_ERR(mem_priv)) { | |
fd4354cf | 1506 | dprintk(1, "failed to attach dmabuf\n"); |
c5384048 SS |
1507 | ret = PTR_ERR(mem_priv); |
1508 | dma_buf_put(dbuf); | |
1509 | goto err; | |
1510 | } | |
1511 | ||
1512 | vb->planes[plane].dbuf = dbuf; | |
1513 | vb->planes[plane].mem_priv = mem_priv; | |
1514 | } | |
1515 | ||
1516 | /* TODO: This pins the buffer(s) with dma_buf_map_attachment()).. but | |
1517 | * really we want to do this just before the DMA, not while queueing | |
1518 | * the buffer(s).. | |
1519 | */ | |
1520 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
b5b4541e | 1521 | ret = call_memop(vb, map_dmabuf, vb->planes[plane].mem_priv); |
c5384048 | 1522 | if (ret) { |
fd4354cf | 1523 | dprintk(1, "failed to map dmabuf for plane %d\n", |
c5384048 SS |
1524 | plane); |
1525 | goto err; | |
1526 | } | |
1527 | vb->planes[plane].dbuf_mapped = 1; | |
1528 | } | |
1529 | ||
c5384048 SS |
1530 | /* |
1531 | * Now that everything is in order, copy relevant information | |
1532 | * provided by userspace. | |
1533 | */ | |
1534 | for (plane = 0; plane < vb->num_planes; ++plane) | |
1535 | vb->v4l2_planes[plane] = planes[plane]; | |
1536 | ||
256f3162 HV |
1537 | if (reacquired) { |
1538 | /* | |
1539 | * Call driver-specific initialization on the newly acquired buffer, | |
1540 | * if provided. | |
1541 | */ | |
1542 | ret = call_vb_qop(vb, buf_init, vb); | |
1543 | if (ret) { | |
fd4354cf | 1544 | dprintk(1, "buffer initialization failed\n"); |
256f3162 HV |
1545 | goto err; |
1546 | } | |
1547 | } | |
1548 | ||
1549 | ret = call_vb_qop(vb, buf_prepare, vb); | |
1550 | if (ret) { | |
fd4354cf | 1551 | dprintk(1, "buffer preparation failed\n"); |
a1d36d8c | 1552 | call_void_vb_qop(vb, buf_cleanup, vb); |
256f3162 HV |
1553 | goto err; |
1554 | } | |
1555 | ||
c5384048 SS |
1556 | return 0; |
1557 | err: | |
1558 | /* In case of errors, release planes that were already acquired */ | |
1559 | __vb2_buf_dmabuf_put(vb); | |
1560 | ||
1561 | return ret; | |
1562 | } | |
1563 | ||
e23ccc0a PO |
1564 | /** |
1565 | * __enqueue_in_driver() - enqueue a vb2_buffer in driver for processing | |
1566 | */ | |
1567 | static void __enqueue_in_driver(struct vb2_buffer *vb) | |
1568 | { | |
1569 | struct vb2_queue *q = vb->vb2_queue; | |
3e0c2f20 | 1570 | unsigned int plane; |
e23ccc0a PO |
1571 | |
1572 | vb->state = VB2_BUF_STATE_ACTIVE; | |
6ea3b980 | 1573 | atomic_inc(&q->owned_by_drv_count); |
3e0c2f20 MS |
1574 | |
1575 | /* sync buffers */ | |
1576 | for (plane = 0; plane < vb->num_planes; ++plane) | |
a1d36d8c | 1577 | call_void_memop(vb, prepare, vb->planes[plane].mem_priv); |
3e0c2f20 | 1578 | |
a1d36d8c | 1579 | call_void_vb_qop(vb, buf_queue, vb); |
e23ccc0a PO |
1580 | } |
1581 | ||
2d86401c | 1582 | static int __buf_prepare(struct vb2_buffer *vb, const struct v4l2_buffer *b) |
ebc087d0 GL |
1583 | { |
1584 | struct vb2_queue *q = vb->vb2_queue; | |
b18a8ff2 | 1585 | struct rw_semaphore *mmap_sem; |
ebc087d0 GL |
1586 | int ret; |
1587 | ||
8023ed09 | 1588 | ret = __verify_length(vb, b); |
3a9621b0 | 1589 | if (ret < 0) { |
fd4354cf | 1590 | dprintk(1, "plane parameters verification failed: %d\n", ret); |
8023ed09 | 1591 | return ret; |
3a9621b0 | 1592 | } |
e35e41b5 HV |
1593 | if (b->field == V4L2_FIELD_ALTERNATE && V4L2_TYPE_IS_OUTPUT(q->type)) { |
1594 | /* | |
1595 | * If the format's field is ALTERNATE, then the buffer's field | |
1596 | * should be either TOP or BOTTOM, not ALTERNATE since that | |
1597 | * makes no sense. The driver has to know whether the | |
1598 | * buffer represents a top or a bottom field in order to | |
1599 | * program any DMA correctly. Using ALTERNATE is wrong, since | |
1600 | * that just says that it is either a top or a bottom field, | |
1601 | * but not which of the two it is. | |
1602 | */ | |
1603 | dprintk(1, "the field is incorrectly set to ALTERNATE for an output buffer\n"); | |
1604 | return -EINVAL; | |
1605 | } | |
8023ed09 | 1606 | |
4bb7267d LP |
1607 | if (q->error) { |
1608 | dprintk(1, "fatal error occurred on queue\n"); | |
1609 | return -EIO; | |
1610 | } | |
1611 | ||
b18a8ff2 | 1612 | vb->state = VB2_BUF_STATE_PREPARING; |
f1343281 HV |
1613 | vb->v4l2_buf.timestamp.tv_sec = 0; |
1614 | vb->v4l2_buf.timestamp.tv_usec = 0; | |
1615 | vb->v4l2_buf.sequence = 0; | |
1616 | ||
ebc087d0 GL |
1617 | switch (q->memory) { |
1618 | case V4L2_MEMORY_MMAP: | |
1619 | ret = __qbuf_mmap(vb, b); | |
1620 | break; | |
1621 | case V4L2_MEMORY_USERPTR: | |
b18a8ff2 | 1622 | /* |
f103b5d6 MCC |
1623 | * In case of user pointer buffers vb2 allocators need to get |
1624 | * direct access to userspace pages. This requires getting | |
1625 | * the mmap semaphore for read access in the current process | |
1626 | * structure. The same semaphore is taken before calling mmap | |
1627 | * operation, while both qbuf/prepare_buf and mmap are called | |
1628 | * by the driver or v4l2 core with the driver's lock held. | |
1629 | * To avoid an AB-BA deadlock (mmap_sem then driver's lock in | |
1630 | * mmap and driver's lock then mmap_sem in qbuf/prepare_buf), | |
1631 | * the videobuf2 core releases the driver's lock, takes | |
1632 | * mmap_sem and then takes the driver's lock again. | |
b18a8ff2 HV |
1633 | */ |
1634 | mmap_sem = ¤t->mm->mmap_sem; | |
a1d36d8c | 1635 | call_void_qop(q, wait_prepare, q); |
b18a8ff2 | 1636 | down_read(mmap_sem); |
a1d36d8c | 1637 | call_void_qop(q, wait_finish, q); |
b18a8ff2 | 1638 | |
ebc087d0 | 1639 | ret = __qbuf_userptr(vb, b); |
b18a8ff2 HV |
1640 | |
1641 | up_read(mmap_sem); | |
ebc087d0 | 1642 | break; |
c5384048 SS |
1643 | case V4L2_MEMORY_DMABUF: |
1644 | ret = __qbuf_dmabuf(vb, b); | |
1645 | break; | |
ebc087d0 GL |
1646 | default: |
1647 | WARN(1, "Invalid queue type\n"); | |
1648 | ret = -EINVAL; | |
1649 | } | |
1650 | ||
ebc087d0 | 1651 | if (ret) |
fd4354cf | 1652 | dprintk(1, "buffer preparation failed: %d\n", ret); |
b18a8ff2 | 1653 | vb->state = ret ? VB2_BUF_STATE_DEQUEUED : VB2_BUF_STATE_PREPARED; |
ebc087d0 GL |
1654 | |
1655 | return ret; | |
1656 | } | |
1657 | ||
012043b8 | 1658 | static int vb2_queue_or_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b, |
4138111a | 1659 | const char *opname) |
2d86401c | 1660 | { |
2d86401c | 1661 | if (b->type != q->type) { |
fd4354cf | 1662 | dprintk(1, "%s: invalid buffer type\n", opname); |
b18a8ff2 | 1663 | return -EINVAL; |
2d86401c GL |
1664 | } |
1665 | ||
1666 | if (b->index >= q->num_buffers) { | |
fd4354cf | 1667 | dprintk(1, "%s: buffer index out of range\n", opname); |
b18a8ff2 | 1668 | return -EINVAL; |
2d86401c GL |
1669 | } |
1670 | ||
4138111a | 1671 | if (q->bufs[b->index] == NULL) { |
2d86401c | 1672 | /* Should never happen */ |
fd4354cf | 1673 | dprintk(1, "%s: buffer is NULL\n", opname); |
b18a8ff2 | 1674 | return -EINVAL; |
2d86401c GL |
1675 | } |
1676 | ||
1677 | if (b->memory != q->memory) { | |
fd4354cf | 1678 | dprintk(1, "%s: invalid memory type\n", opname); |
b18a8ff2 | 1679 | return -EINVAL; |
2d86401c GL |
1680 | } |
1681 | ||
4138111a | 1682 | return __verify_planes_array(q->bufs[b->index], b); |
012043b8 | 1683 | } |
2d86401c | 1684 | |
e23ccc0a | 1685 | /** |
012043b8 | 1686 | * vb2_prepare_buf() - Pass ownership of a buffer from userspace to the kernel |
e23ccc0a | 1687 | * @q: videobuf2 queue |
012043b8 LP |
1688 | * @b: buffer structure passed from userspace to vidioc_prepare_buf |
1689 | * handler in driver | |
e23ccc0a | 1690 | * |
012043b8 | 1691 | * Should be called from vidioc_prepare_buf ioctl handler of a driver. |
e23ccc0a PO |
1692 | * This function: |
1693 | * 1) verifies the passed buffer, | |
012043b8 LP |
1694 | * 2) calls buf_prepare callback in the driver (if provided), in which |
1695 | * driver-specific buffer initialization can be performed, | |
e23ccc0a PO |
1696 | * |
1697 | * The return values from this function are intended to be directly returned | |
012043b8 | 1698 | * from vidioc_prepare_buf handler in driver. |
e23ccc0a | 1699 | */ |
012043b8 | 1700 | int vb2_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b) |
e23ccc0a | 1701 | { |
4138111a | 1702 | struct vb2_buffer *vb; |
b2f2f047 HV |
1703 | int ret; |
1704 | ||
74753cff | 1705 | if (vb2_fileio_is_active(q)) { |
fd4354cf | 1706 | dprintk(1, "file io in progress\n"); |
b2f2f047 HV |
1707 | return -EBUSY; |
1708 | } | |
4138111a | 1709 | |
b2f2f047 | 1710 | ret = vb2_queue_or_prepare_buf(q, b, "prepare_buf"); |
4138111a HV |
1711 | if (ret) |
1712 | return ret; | |
1713 | ||
1714 | vb = q->bufs[b->index]; | |
1715 | if (vb->state != VB2_BUF_STATE_DEQUEUED) { | |
fd4354cf | 1716 | dprintk(1, "invalid buffer state %d\n", |
4138111a HV |
1717 | vb->state); |
1718 | return -EINVAL; | |
1719 | } | |
1720 | ||
1721 | ret = __buf_prepare(vb, b); | |
1722 | if (!ret) { | |
1723 | /* Fill buffer information for the userspace */ | |
1724 | __fill_v4l2_buffer(vb, b); | |
1725 | ||
fd4354cf | 1726 | dprintk(1, "prepare of buffer %d succeeded\n", vb->v4l2_buf.index); |
4138111a HV |
1727 | } |
1728 | return ret; | |
012043b8 LP |
1729 | } |
1730 | EXPORT_SYMBOL_GPL(vb2_prepare_buf); | |
e23ccc0a | 1731 | |
02f142ec HV |
1732 | /** |
1733 | * vb2_start_streaming() - Attempt to start streaming. | |
1734 | * @q: videobuf2 queue | |
1735 | * | |
b3379c62 HV |
1736 | * Attempt to start streaming. When this function is called there must be |
1737 | * at least q->min_buffers_needed buffers queued up (i.e. the minimum | |
1738 | * number of buffers required for the DMA engine to function). If the | |
1739 | * @start_streaming op fails it is supposed to return all the driver-owned | |
1740 | * buffers back to vb2 in state QUEUED. Check if that happened and if | |
1741 | * not warn and reclaim them forcefully. | |
02f142ec HV |
1742 | */ |
1743 | static int vb2_start_streaming(struct vb2_queue *q) | |
1744 | { | |
b3379c62 | 1745 | struct vb2_buffer *vb; |
02f142ec HV |
1746 | int ret; |
1747 | ||
02f142ec | 1748 | /* |
b3379c62 HV |
1749 | * If any buffers were queued before streamon, |
1750 | * we can now pass them to driver for processing. | |
02f142ec | 1751 | */ |
b3379c62 HV |
1752 | list_for_each_entry(vb, &q->queued_list, queued_entry) |
1753 | __enqueue_in_driver(vb); | |
1754 | ||
1755 | /* Tell the driver to start streaming */ | |
bd994ddb | 1756 | q->start_streaming_called = 1; |
b3379c62 HV |
1757 | ret = call_qop(q, start_streaming, q, |
1758 | atomic_read(&q->owned_by_drv_count)); | |
b3379c62 | 1759 | if (!ret) |
02f142ec | 1760 | return 0; |
b3379c62 | 1761 | |
bd994ddb LP |
1762 | q->start_streaming_called = 0; |
1763 | ||
fd4354cf | 1764 | dprintk(1, "driver refused to start streaming\n"); |
b3379c62 HV |
1765 | if (WARN_ON(atomic_read(&q->owned_by_drv_count))) { |
1766 | unsigned i; | |
1767 | ||
1768 | /* | |
1769 | * Forcefully reclaim buffers if the driver did not | |
1770 | * correctly return them to vb2. | |
1771 | */ | |
1772 | for (i = 0; i < q->num_buffers; ++i) { | |
1773 | vb = q->bufs[i]; | |
1774 | if (vb->state == VB2_BUF_STATE_ACTIVE) | |
1775 | vb2_buffer_done(vb, VB2_BUF_STATE_QUEUED); | |
1776 | } | |
1777 | /* Must be zero now */ | |
1778 | WARN_ON(atomic_read(&q->owned_by_drv_count)); | |
02f142ec | 1779 | } |
02f142ec HV |
1780 | return ret; |
1781 | } | |
1782 | ||
b2f2f047 | 1783 | static int vb2_internal_qbuf(struct vb2_queue *q, struct v4l2_buffer *b) |
012043b8 | 1784 | { |
4138111a HV |
1785 | int ret = vb2_queue_or_prepare_buf(q, b, "qbuf"); |
1786 | struct vb2_buffer *vb; | |
1787 | ||
1788 | if (ret) | |
1789 | return ret; | |
1790 | ||
1791 | vb = q->bufs[b->index]; | |
e23ccc0a | 1792 | |
ebc087d0 GL |
1793 | switch (vb->state) { |
1794 | case VB2_BUF_STATE_DEQUEUED: | |
1795 | ret = __buf_prepare(vb, b); | |
1796 | if (ret) | |
012043b8 | 1797 | return ret; |
4138111a | 1798 | break; |
ebc087d0 GL |
1799 | case VB2_BUF_STATE_PREPARED: |
1800 | break; | |
b18a8ff2 | 1801 | case VB2_BUF_STATE_PREPARING: |
fd4354cf | 1802 | dprintk(1, "buffer still being prepared\n"); |
b18a8ff2 | 1803 | return -EINVAL; |
ebc087d0 | 1804 | default: |
fd4354cf | 1805 | dprintk(1, "invalid buffer state %d\n", vb->state); |
012043b8 | 1806 | return -EINVAL; |
e23ccc0a PO |
1807 | } |
1808 | ||
e23ccc0a PO |
1809 | /* |
1810 | * Add to the queued buffers list, a buffer will stay on it until | |
1811 | * dequeued in dqbuf. | |
1812 | */ | |
1813 | list_add_tail(&vb->queued_entry, &q->queued_list); | |
b3379c62 | 1814 | q->queued_count++; |
e23ccc0a | 1815 | vb->state = VB2_BUF_STATE_QUEUED; |
f1343281 HV |
1816 | if (V4L2_TYPE_IS_OUTPUT(q->type)) { |
1817 | /* | |
1818 | * For output buffers copy the timestamp if needed, | |
1819 | * and the timecode field and flag if needed. | |
1820 | */ | |
c57ff792 SA |
1821 | if ((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == |
1822 | V4L2_BUF_FLAG_TIMESTAMP_COPY) | |
f1343281 HV |
1823 | vb->v4l2_buf.timestamp = b->timestamp; |
1824 | vb->v4l2_buf.flags |= b->flags & V4L2_BUF_FLAG_TIMECODE; | |
1825 | if (b->flags & V4L2_BUF_FLAG_TIMECODE) | |
1826 | vb->v4l2_buf.timecode = b->timecode; | |
1827 | } | |
e23ccc0a PO |
1828 | |
1829 | /* | |
1830 | * If already streaming, give the buffer to driver for processing. | |
1831 | * If not, the buffer will be given to driver on next streamon. | |
1832 | */ | |
b3379c62 | 1833 | if (q->start_streaming_called) |
e23ccc0a PO |
1834 | __enqueue_in_driver(vb); |
1835 | ||
4138111a HV |
1836 | /* Fill buffer information for the userspace */ |
1837 | __fill_v4l2_buffer(vb, b); | |
21db3e07 | 1838 | |
b3379c62 HV |
1839 | /* |
1840 | * If streamon has been called, and we haven't yet called | |
1841 | * start_streaming() since not enough buffers were queued, and | |
1842 | * we now have reached the minimum number of queued buffers, | |
1843 | * then we can finally call start_streaming(). | |
1844 | */ | |
1845 | if (q->streaming && !q->start_streaming_called && | |
1846 | q->queued_count >= q->min_buffers_needed) { | |
02f142ec HV |
1847 | ret = vb2_start_streaming(q); |
1848 | if (ret) | |
1849 | return ret; | |
1850 | } | |
1851 | ||
fd4354cf | 1852 | dprintk(1, "qbuf of buffer %d succeeded\n", vb->v4l2_buf.index); |
4138111a | 1853 | return 0; |
e23ccc0a | 1854 | } |
b2f2f047 HV |
1855 | |
1856 | /** | |
1857 | * vb2_qbuf() - Queue a buffer from userspace | |
1858 | * @q: videobuf2 queue | |
1859 | * @b: buffer structure passed from userspace to vidioc_qbuf handler | |
1860 | * in driver | |
1861 | * | |
1862 | * Should be called from vidioc_qbuf ioctl handler of a driver. | |
1863 | * This function: | |
1864 | * 1) verifies the passed buffer, | |
1865 | * 2) if necessary, calls buf_prepare callback in the driver (if provided), in | |
1866 | * which driver-specific buffer initialization can be performed, | |
1867 | * 3) if streaming is on, queues the buffer in driver by the means of buf_queue | |
1868 | * callback for processing. | |
1869 | * | |
1870 | * The return values from this function are intended to be directly returned | |
1871 | * from vidioc_qbuf handler in driver. | |
1872 | */ | |
1873 | int vb2_qbuf(struct vb2_queue *q, struct v4l2_buffer *b) | |
1874 | { | |
74753cff | 1875 | if (vb2_fileio_is_active(q)) { |
fd4354cf | 1876 | dprintk(1, "file io in progress\n"); |
b2f2f047 HV |
1877 | return -EBUSY; |
1878 | } | |
1879 | ||
1880 | return vb2_internal_qbuf(q, b); | |
1881 | } | |
e23ccc0a PO |
1882 | EXPORT_SYMBOL_GPL(vb2_qbuf); |
1883 | ||
1884 | /** | |
1885 | * __vb2_wait_for_done_vb() - wait for a buffer to become available | |
1886 | * for dequeuing | |
1887 | * | |
1888 | * Will sleep if required for nonblocking == false. | |
1889 | */ | |
1890 | static int __vb2_wait_for_done_vb(struct vb2_queue *q, int nonblocking) | |
1891 | { | |
1892 | /* | |
1893 | * All operations on vb_done_list are performed under done_lock | |
1894 | * spinlock protection. However, buffers may be removed from | |
1895 | * it and returned to userspace only while holding both driver's | |
1896 | * lock and the done_lock spinlock. Thus we can be sure that as | |
1897 | * long as we hold the driver's lock, the list will remain not | |
1898 | * empty if list_empty() check succeeds. | |
1899 | */ | |
1900 | ||
1901 | for (;;) { | |
1902 | int ret; | |
1903 | ||
1904 | if (!q->streaming) { | |
3050040b | 1905 | dprintk(1, "streaming off, will not wait for buffers\n"); |
e23ccc0a PO |
1906 | return -EINVAL; |
1907 | } | |
1908 | ||
4bb7267d LP |
1909 | if (q->error) { |
1910 | dprintk(1, "Queue in error state, will not wait for buffers\n"); | |
1911 | return -EIO; | |
1912 | } | |
1913 | ||
e23ccc0a PO |
1914 | if (!list_empty(&q->done_list)) { |
1915 | /* | |
1916 | * Found a buffer that we were waiting for. | |
1917 | */ | |
1918 | break; | |
1919 | } | |
1920 | ||
1921 | if (nonblocking) { | |
3050040b | 1922 | dprintk(1, "nonblocking and no buffers to dequeue, " |
e23ccc0a PO |
1923 | "will not wait\n"); |
1924 | return -EAGAIN; | |
1925 | } | |
1926 | ||
1927 | /* | |
1928 | * We are streaming and blocking, wait for another buffer to | |
1929 | * become ready or for streamoff. Driver's lock is released to | |
1930 | * allow streamoff or qbuf to be called while waiting. | |
1931 | */ | |
a1d36d8c | 1932 | call_void_qop(q, wait_prepare, q); |
e23ccc0a PO |
1933 | |
1934 | /* | |
1935 | * All locks have been released, it is safe to sleep now. | |
1936 | */ | |
3050040b | 1937 | dprintk(3, "will sleep waiting for buffers\n"); |
e23ccc0a | 1938 | ret = wait_event_interruptible(q->done_wq, |
4bb7267d LP |
1939 | !list_empty(&q->done_list) || !q->streaming || |
1940 | q->error); | |
e23ccc0a PO |
1941 | |
1942 | /* | |
1943 | * We need to reevaluate both conditions again after reacquiring | |
1944 | * the locks or return an error if one occurred. | |
1945 | */ | |
a1d36d8c | 1946 | call_void_qop(q, wait_finish, q); |
32a77260 | 1947 | if (ret) { |
3050040b | 1948 | dprintk(1, "sleep was interrupted\n"); |
e23ccc0a | 1949 | return ret; |
32a77260 | 1950 | } |
e23ccc0a PO |
1951 | } |
1952 | return 0; | |
1953 | } | |
1954 | ||
1955 | /** | |
1956 | * __vb2_get_done_vb() - get a buffer ready for dequeuing | |
1957 | * | |
1958 | * Will sleep if required for nonblocking == false. | |
1959 | */ | |
1960 | static int __vb2_get_done_vb(struct vb2_queue *q, struct vb2_buffer **vb, | |
32a77260 | 1961 | struct v4l2_buffer *b, int nonblocking) |
e23ccc0a PO |
1962 | { |
1963 | unsigned long flags; | |
1964 | int ret; | |
1965 | ||
1966 | /* | |
1967 | * Wait for at least one buffer to become available on the done_list. | |
1968 | */ | |
1969 | ret = __vb2_wait_for_done_vb(q, nonblocking); | |
1970 | if (ret) | |
1971 | return ret; | |
1972 | ||
1973 | /* | |
1974 | * Driver's lock has been held since we last verified that done_list | |
1975 | * is not empty, so no need for another list_empty(done_list) check. | |
1976 | */ | |
1977 | spin_lock_irqsave(&q->done_lock, flags); | |
1978 | *vb = list_first_entry(&q->done_list, struct vb2_buffer, done_entry); | |
32a77260 HV |
1979 | /* |
1980 | * Only remove the buffer from done_list if v4l2_buffer can handle all | |
1981 | * the planes. | |
1982 | */ | |
1983 | ret = __verify_planes_array(*vb, b); | |
1984 | if (!ret) | |
1985 | list_del(&(*vb)->done_entry); | |
e23ccc0a PO |
1986 | spin_unlock_irqrestore(&q->done_lock, flags); |
1987 | ||
32a77260 | 1988 | return ret; |
e23ccc0a PO |
1989 | } |
1990 | ||
1991 | /** | |
1992 | * vb2_wait_for_all_buffers() - wait until all buffers are given back to vb2 | |
1993 | * @q: videobuf2 queue | |
1994 | * | |
1995 | * This function will wait until all buffers that have been given to the driver | |
1996 | * by buf_queue() are given back to vb2 with vb2_buffer_done(). It doesn't call | |
1997 | * wait_prepare, wait_finish pair. It is intended to be called with all locks | |
1998 | * taken, for example from stop_streaming() callback. | |
1999 | */ | |
2000 | int vb2_wait_for_all_buffers(struct vb2_queue *q) | |
2001 | { | |
2002 | if (!q->streaming) { | |
3050040b | 2003 | dprintk(1, "streaming off, will not wait for buffers\n"); |
e23ccc0a PO |
2004 | return -EINVAL; |
2005 | } | |
2006 | ||
b3379c62 | 2007 | if (q->start_streaming_called) |
6ea3b980 | 2008 | wait_event(q->done_wq, !atomic_read(&q->owned_by_drv_count)); |
e23ccc0a PO |
2009 | return 0; |
2010 | } | |
2011 | EXPORT_SYMBOL_GPL(vb2_wait_for_all_buffers); | |
2012 | ||
c5384048 SS |
2013 | /** |
2014 | * __vb2_dqbuf() - bring back the buffer to the DEQUEUED state | |
2015 | */ | |
2016 | static void __vb2_dqbuf(struct vb2_buffer *vb) | |
2017 | { | |
2018 | struct vb2_queue *q = vb->vb2_queue; | |
2019 | unsigned int i; | |
2020 | ||
2021 | /* nothing to do if the buffer is already dequeued */ | |
2022 | if (vb->state == VB2_BUF_STATE_DEQUEUED) | |
2023 | return; | |
2024 | ||
2025 | vb->state = VB2_BUF_STATE_DEQUEUED; | |
2026 | ||
2027 | /* unmap DMABUF buffer */ | |
2028 | if (q->memory == V4L2_MEMORY_DMABUF) | |
2029 | for (i = 0; i < vb->num_planes; ++i) { | |
2030 | if (!vb->planes[i].dbuf_mapped) | |
2031 | continue; | |
a1d36d8c | 2032 | call_void_memop(vb, unmap_dmabuf, vb->planes[i].mem_priv); |
c5384048 SS |
2033 | vb->planes[i].dbuf_mapped = 0; |
2034 | } | |
2035 | } | |
2036 | ||
b2f2f047 | 2037 | static int vb2_internal_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking) |
e23ccc0a PO |
2038 | { |
2039 | struct vb2_buffer *vb = NULL; | |
2040 | int ret; | |
2041 | ||
2042 | if (b->type != q->type) { | |
fd4354cf | 2043 | dprintk(1, "invalid buffer type\n"); |
e23ccc0a PO |
2044 | return -EINVAL; |
2045 | } | |
32a77260 HV |
2046 | ret = __vb2_get_done_vb(q, &vb, b, nonblocking); |
2047 | if (ret < 0) | |
e23ccc0a | 2048 | return ret; |
e23ccc0a | 2049 | |
e23ccc0a PO |
2050 | switch (vb->state) { |
2051 | case VB2_BUF_STATE_DONE: | |
3050040b | 2052 | dprintk(3, "returning done buffer\n"); |
e23ccc0a PO |
2053 | break; |
2054 | case VB2_BUF_STATE_ERROR: | |
3050040b | 2055 | dprintk(3, "returning done buffer with errors\n"); |
e23ccc0a PO |
2056 | break; |
2057 | default: | |
3050040b | 2058 | dprintk(1, "invalid buffer state\n"); |
e23ccc0a PO |
2059 | return -EINVAL; |
2060 | } | |
2061 | ||
a1d36d8c | 2062 | call_void_vb_qop(vb, buf_finish, vb); |
9cf3c31a | 2063 | |
e23ccc0a PO |
2064 | /* Fill buffer information for the userspace */ |
2065 | __fill_v4l2_buffer(vb, b); | |
2066 | /* Remove from videobuf queue */ | |
2067 | list_del(&vb->queued_entry); | |
b3379c62 | 2068 | q->queued_count--; |
c5384048 SS |
2069 | /* go back to dequeued state */ |
2070 | __vb2_dqbuf(vb); | |
e23ccc0a PO |
2071 | |
2072 | dprintk(1, "dqbuf of buffer %d, with state %d\n", | |
2073 | vb->v4l2_buf.index, vb->state); | |
2074 | ||
e23ccc0a PO |
2075 | return 0; |
2076 | } | |
b2f2f047 HV |
2077 | |
2078 | /** | |
2079 | * vb2_dqbuf() - Dequeue a buffer to the userspace | |
2080 | * @q: videobuf2 queue | |
2081 | * @b: buffer structure passed from userspace to vidioc_dqbuf handler | |
2082 | * in driver | |
2083 | * @nonblocking: if true, this call will not sleep waiting for a buffer if no | |
2084 | * buffers ready for dequeuing are present. Normally the driver | |
2085 | * would be passing (file->f_flags & O_NONBLOCK) here | |
2086 | * | |
2087 | * Should be called from vidioc_dqbuf ioctl handler of a driver. | |
2088 | * This function: | |
2089 | * 1) verifies the passed buffer, | |
2090 | * 2) calls buf_finish callback in the driver (if provided), in which | |
2091 | * driver can perform any additional operations that may be required before | |
2092 | * returning the buffer to userspace, such as cache sync, | |
2093 | * 3) the buffer struct members are filled with relevant information for | |
2094 | * the userspace. | |
2095 | * | |
2096 | * The return values from this function are intended to be directly returned | |
2097 | * from vidioc_dqbuf handler in driver. | |
2098 | */ | |
2099 | int vb2_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking) | |
2100 | { | |
74753cff | 2101 | if (vb2_fileio_is_active(q)) { |
fd4354cf | 2102 | dprintk(1, "file io in progress\n"); |
b2f2f047 HV |
2103 | return -EBUSY; |
2104 | } | |
2105 | return vb2_internal_dqbuf(q, b, nonblocking); | |
2106 | } | |
e23ccc0a PO |
2107 | EXPORT_SYMBOL_GPL(vb2_dqbuf); |
2108 | ||
bd323e28 MS |
2109 | /** |
2110 | * __vb2_queue_cancel() - cancel and stop (pause) streaming | |
2111 | * | |
2112 | * Removes all queued buffers from driver's queue and all buffers queued by | |
2113 | * userspace from videobuf's queue. Returns to state after reqbufs. | |
2114 | */ | |
2115 | static void __vb2_queue_cancel(struct vb2_queue *q) | |
2116 | { | |
2117 | unsigned int i; | |
2118 | ||
2119 | /* | |
2120 | * Tell driver to stop all transactions and release all queued | |
2121 | * buffers. | |
2122 | */ | |
b3379c62 | 2123 | if (q->start_streaming_called) |
e37559b2 | 2124 | call_void_qop(q, stop_streaming, q); |
b3379c62 HV |
2125 | |
2126 | if (WARN_ON(atomic_read(&q->owned_by_drv_count))) { | |
2127 | for (i = 0; i < q->num_buffers; ++i) | |
2128 | if (q->bufs[i]->state == VB2_BUF_STATE_ACTIVE) | |
2129 | vb2_buffer_done(q->bufs[i], VB2_BUF_STATE_ERROR); | |
2130 | /* Must be zero now */ | |
2131 | WARN_ON(atomic_read(&q->owned_by_drv_count)); | |
2132 | } | |
bd323e28 | 2133 | |
b646f0b7 LP |
2134 | q->streaming = 0; |
2135 | q->start_streaming_called = 0; | |
2136 | q->queued_count = 0; | |
4bb7267d | 2137 | q->error = 0; |
b646f0b7 | 2138 | |
bd323e28 MS |
2139 | /* |
2140 | * Remove all buffers from videobuf's list... | |
2141 | */ | |
2142 | INIT_LIST_HEAD(&q->queued_list); | |
2143 | /* | |
2144 | * ...and done list; userspace will not receive any buffers it | |
2145 | * has not already dequeued before initiating cancel. | |
2146 | */ | |
2147 | INIT_LIST_HEAD(&q->done_list); | |
6ea3b980 | 2148 | atomic_set(&q->owned_by_drv_count, 0); |
bd323e28 MS |
2149 | wake_up_all(&q->done_wq); |
2150 | ||
2151 | /* | |
2152 | * Reinitialize all buffers for next use. | |
9c0863b1 HV |
2153 | * Make sure to call buf_finish for any queued buffers. Normally |
2154 | * that's done in dqbuf, but that's not going to happen when we | |
2155 | * cancel the whole queue. Note: this code belongs here, not in | |
2156 | * __vb2_dqbuf() since in vb2_internal_dqbuf() there is a critical | |
2157 | * call to __fill_v4l2_buffer() after buf_finish(). That order can't | |
2158 | * be changed, so we can't move the buf_finish() to __vb2_dqbuf(). | |
bd323e28 | 2159 | */ |
9c0863b1 HV |
2160 | for (i = 0; i < q->num_buffers; ++i) { |
2161 | struct vb2_buffer *vb = q->bufs[i]; | |
2162 | ||
2163 | if (vb->state != VB2_BUF_STATE_DEQUEUED) { | |
2164 | vb->state = VB2_BUF_STATE_PREPARED; | |
a1d36d8c | 2165 | call_void_vb_qop(vb, buf_finish, vb); |
9c0863b1 HV |
2166 | } |
2167 | __vb2_dqbuf(vb); | |
2168 | } | |
bd323e28 MS |
2169 | } |
2170 | ||
b2f2f047 | 2171 | static int vb2_internal_streamon(struct vb2_queue *q, enum v4l2_buf_type type) |
e23ccc0a | 2172 | { |
5db2c3ba | 2173 | int ret; |
e23ccc0a PO |
2174 | |
2175 | if (type != q->type) { | |
fd4354cf | 2176 | dprintk(1, "invalid stream type\n"); |
e23ccc0a PO |
2177 | return -EINVAL; |
2178 | } | |
2179 | ||
2180 | if (q->streaming) { | |
fd4354cf | 2181 | dprintk(3, "already streaming\n"); |
f956035c | 2182 | return 0; |
e23ccc0a PO |
2183 | } |
2184 | ||
548df783 | 2185 | if (!q->num_buffers) { |
fd4354cf | 2186 | dprintk(1, "no buffers have been allocated\n"); |
548df783 RR |
2187 | return -EINVAL; |
2188 | } | |
2189 | ||
b3379c62 | 2190 | if (q->num_buffers < q->min_buffers_needed) { |
fd4354cf | 2191 | dprintk(1, "need at least %u allocated buffers\n", |
b3379c62 HV |
2192 | q->min_buffers_needed); |
2193 | return -EINVAL; | |
2194 | } | |
249f5a58 | 2195 | |
e23ccc0a | 2196 | /* |
b3379c62 HV |
2197 | * Tell driver to start streaming provided sufficient buffers |
2198 | * are available. | |
e23ccc0a | 2199 | */ |
b3379c62 HV |
2200 | if (q->queued_count >= q->min_buffers_needed) { |
2201 | ret = vb2_start_streaming(q); | |
2202 | if (ret) { | |
2203 | __vb2_queue_cancel(q); | |
2204 | return ret; | |
2205 | } | |
5db2c3ba PO |
2206 | } |
2207 | ||
2208 | q->streaming = 1; | |
e23ccc0a | 2209 | |
fd4354cf | 2210 | dprintk(3, "successful\n"); |
e23ccc0a PO |
2211 | return 0; |
2212 | } | |
e23ccc0a | 2213 | |
4bb7267d LP |
2214 | /** |
2215 | * vb2_queue_error() - signal a fatal error on the queue | |
2216 | * @q: videobuf2 queue | |
2217 | * | |
2218 | * Flag that a fatal unrecoverable error has occurred and wake up all processes | |
2219 | * waiting on the queue. Polling will now set POLLERR and queuing and dequeuing | |
2220 | * buffers will return -EIO. | |
2221 | * | |
2222 | * The error flag will be cleared when cancelling the queue, either from | |
2223 | * vb2_streamoff or vb2_queue_release. Drivers should thus not call this | |
2224 | * function before starting the stream, otherwise the error flag will remain set | |
2225 | * until the queue is released when closing the device node. | |
2226 | */ | |
2227 | void vb2_queue_error(struct vb2_queue *q) | |
2228 | { | |
2229 | q->error = 1; | |
2230 | ||
2231 | wake_up_all(&q->done_wq); | |
2232 | } | |
2233 | EXPORT_SYMBOL_GPL(vb2_queue_error); | |
2234 | ||
e23ccc0a | 2235 | /** |
b2f2f047 | 2236 | * vb2_streamon - start streaming |
e23ccc0a | 2237 | * @q: videobuf2 queue |
b2f2f047 | 2238 | * @type: type argument passed from userspace to vidioc_streamon handler |
e23ccc0a | 2239 | * |
b2f2f047 | 2240 | * Should be called from vidioc_streamon handler of a driver. |
e23ccc0a | 2241 | * This function: |
b2f2f047 HV |
2242 | * 1) verifies current state |
2243 | * 2) passes any previously queued buffers to the driver and starts streaming | |
e23ccc0a | 2244 | * |
e23ccc0a | 2245 | * The return values from this function are intended to be directly returned |
b2f2f047 | 2246 | * from vidioc_streamon handler in the driver. |
e23ccc0a | 2247 | */ |
b2f2f047 | 2248 | int vb2_streamon(struct vb2_queue *q, enum v4l2_buf_type type) |
e23ccc0a | 2249 | { |
74753cff | 2250 | if (vb2_fileio_is_active(q)) { |
fd4354cf | 2251 | dprintk(1, "file io in progress\n"); |
b25748fe MS |
2252 | return -EBUSY; |
2253 | } | |
b2f2f047 HV |
2254 | return vb2_internal_streamon(q, type); |
2255 | } | |
2256 | EXPORT_SYMBOL_GPL(vb2_streamon); | |
b25748fe | 2257 | |
b2f2f047 HV |
2258 | static int vb2_internal_streamoff(struct vb2_queue *q, enum v4l2_buf_type type) |
2259 | { | |
e23ccc0a | 2260 | if (type != q->type) { |
fd4354cf | 2261 | dprintk(1, "invalid stream type\n"); |
e23ccc0a PO |
2262 | return -EINVAL; |
2263 | } | |
2264 | ||
e23ccc0a PO |
2265 | /* |
2266 | * Cancel will pause streaming and remove all buffers from the driver | |
2267 | * and videobuf, effectively returning control over them to userspace. | |
3f1a9a33 HV |
2268 | * |
2269 | * Note that we do this even if q->streaming == 0: if you prepare or | |
2270 | * queue buffers, and then call streamoff without ever having called | |
2271 | * streamon, you would still expect those buffers to be returned to | |
2272 | * their normal dequeued state. | |
e23ccc0a PO |
2273 | */ |
2274 | __vb2_queue_cancel(q); | |
2275 | ||
fd4354cf | 2276 | dprintk(3, "successful\n"); |
e23ccc0a PO |
2277 | return 0; |
2278 | } | |
b2f2f047 HV |
2279 | |
2280 | /** | |
2281 | * vb2_streamoff - stop streaming | |
2282 | * @q: videobuf2 queue | |
2283 | * @type: type argument passed from userspace to vidioc_streamoff handler | |
2284 | * | |
2285 | * Should be called from vidioc_streamoff handler of a driver. | |
2286 | * This function: | |
2287 | * 1) verifies current state, | |
2288 | * 2) stop streaming and dequeues any queued buffers, including those previously | |
2289 | * passed to the driver (after waiting for the driver to finish). | |
2290 | * | |
2291 | * This call can be used for pausing playback. | |
2292 | * The return values from this function are intended to be directly returned | |
2293 | * from vidioc_streamoff handler in the driver | |
2294 | */ | |
2295 | int vb2_streamoff(struct vb2_queue *q, enum v4l2_buf_type type) | |
2296 | { | |
74753cff | 2297 | if (vb2_fileio_is_active(q)) { |
fd4354cf | 2298 | dprintk(1, "file io in progress\n"); |
b2f2f047 HV |
2299 | return -EBUSY; |
2300 | } | |
2301 | return vb2_internal_streamoff(q, type); | |
2302 | } | |
e23ccc0a PO |
2303 | EXPORT_SYMBOL_GPL(vb2_streamoff); |
2304 | ||
2305 | /** | |
2306 | * __find_plane_by_offset() - find plane associated with the given offset off | |
2307 | */ | |
2308 | static int __find_plane_by_offset(struct vb2_queue *q, unsigned long off, | |
2309 | unsigned int *_buffer, unsigned int *_plane) | |
2310 | { | |
2311 | struct vb2_buffer *vb; | |
2312 | unsigned int buffer, plane; | |
2313 | ||
2314 | /* | |
2315 | * Go over all buffers and their planes, comparing the given offset | |
2316 | * with an offset assigned to each plane. If a match is found, | |
2317 | * return its buffer and plane numbers. | |
2318 | */ | |
2319 | for (buffer = 0; buffer < q->num_buffers; ++buffer) { | |
2320 | vb = q->bufs[buffer]; | |
2321 | ||
2322 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
2323 | if (vb->v4l2_planes[plane].m.mem_offset == off) { | |
2324 | *_buffer = buffer; | |
2325 | *_plane = plane; | |
2326 | return 0; | |
2327 | } | |
2328 | } | |
2329 | } | |
2330 | ||
2331 | return -EINVAL; | |
2332 | } | |
2333 | ||
83ae7c5a TS |
2334 | /** |
2335 | * vb2_expbuf() - Export a buffer as a file descriptor | |
2336 | * @q: videobuf2 queue | |
2337 | * @eb: export buffer structure passed from userspace to vidioc_expbuf | |
2338 | * handler in driver | |
2339 | * | |
2340 | * The return values from this function are intended to be directly returned | |
2341 | * from vidioc_expbuf handler in driver. | |
2342 | */ | |
2343 | int vb2_expbuf(struct vb2_queue *q, struct v4l2_exportbuffer *eb) | |
2344 | { | |
2345 | struct vb2_buffer *vb = NULL; | |
2346 | struct vb2_plane *vb_plane; | |
2347 | int ret; | |
2348 | struct dma_buf *dbuf; | |
2349 | ||
2350 | if (q->memory != V4L2_MEMORY_MMAP) { | |
3050040b | 2351 | dprintk(1, "queue is not currently set up for mmap\n"); |
83ae7c5a TS |
2352 | return -EINVAL; |
2353 | } | |
2354 | ||
2355 | if (!q->mem_ops->get_dmabuf) { | |
3050040b | 2356 | dprintk(1, "queue does not support DMA buffer exporting\n"); |
83ae7c5a TS |
2357 | return -EINVAL; |
2358 | } | |
2359 | ||
ea3aba84 | 2360 | if (eb->flags & ~(O_CLOEXEC | O_ACCMODE)) { |
3050040b | 2361 | dprintk(1, "queue does support only O_CLOEXEC and access mode flags\n"); |
83ae7c5a TS |
2362 | return -EINVAL; |
2363 | } | |
2364 | ||
2365 | if (eb->type != q->type) { | |
fd4354cf | 2366 | dprintk(1, "invalid buffer type\n"); |
83ae7c5a TS |
2367 | return -EINVAL; |
2368 | } | |
2369 | ||
2370 | if (eb->index >= q->num_buffers) { | |
2371 | dprintk(1, "buffer index out of range\n"); | |
2372 | return -EINVAL; | |
2373 | } | |
2374 | ||
2375 | vb = q->bufs[eb->index]; | |
2376 | ||
2377 | if (eb->plane >= vb->num_planes) { | |
2378 | dprintk(1, "buffer plane out of range\n"); | |
2379 | return -EINVAL; | |
2380 | } | |
2381 | ||
74753cff HV |
2382 | if (vb2_fileio_is_active(q)) { |
2383 | dprintk(1, "expbuf: file io in progress\n"); | |
2384 | return -EBUSY; | |
2385 | } | |
2386 | ||
83ae7c5a TS |
2387 | vb_plane = &vb->planes[eb->plane]; |
2388 | ||
a1d36d8c | 2389 | dbuf = call_ptr_memop(vb, get_dmabuf, vb_plane->mem_priv, eb->flags & O_ACCMODE); |
83ae7c5a | 2390 | if (IS_ERR_OR_NULL(dbuf)) { |
3050040b | 2391 | dprintk(1, "failed to export buffer %d, plane %d\n", |
83ae7c5a TS |
2392 | eb->index, eb->plane); |
2393 | return -EINVAL; | |
2394 | } | |
2395 | ||
ea3aba84 | 2396 | ret = dma_buf_fd(dbuf, eb->flags & ~O_ACCMODE); |
83ae7c5a TS |
2397 | if (ret < 0) { |
2398 | dprintk(3, "buffer %d, plane %d failed to export (%d)\n", | |
2399 | eb->index, eb->plane, ret); | |
2400 | dma_buf_put(dbuf); | |
2401 | return ret; | |
2402 | } | |
2403 | ||
2404 | dprintk(3, "buffer %d, plane %d exported as %d descriptor\n", | |
2405 | eb->index, eb->plane, ret); | |
2406 | eb->fd = ret; | |
2407 | ||
2408 | return 0; | |
2409 | } | |
2410 | EXPORT_SYMBOL_GPL(vb2_expbuf); | |
2411 | ||
e23ccc0a PO |
2412 | /** |
2413 | * vb2_mmap() - map video buffers into application address space | |
2414 | * @q: videobuf2 queue | |
2415 | * @vma: vma passed to the mmap file operation handler in the driver | |
2416 | * | |
2417 | * Should be called from mmap file operation handler of a driver. | |
2418 | * This function maps one plane of one of the available video buffers to | |
2419 | * userspace. To map whole video memory allocated on reqbufs, this function | |
2420 | * has to be called once per each plane per each buffer previously allocated. | |
2421 | * | |
2422 | * When the userspace application calls mmap, it passes to it an offset returned | |
2423 | * to it earlier by the means of vidioc_querybuf handler. That offset acts as | |
2424 | * a "cookie", which is then used to identify the plane to be mapped. | |
2425 | * This function finds a plane with a matching offset and a mapping is performed | |
2426 | * by the means of a provided memory operation. | |
2427 | * | |
2428 | * The return values from this function are intended to be directly returned | |
2429 | * from the mmap handler in driver. | |
2430 | */ | |
2431 | int vb2_mmap(struct vb2_queue *q, struct vm_area_struct *vma) | |
2432 | { | |
2433 | unsigned long off = vma->vm_pgoff << PAGE_SHIFT; | |
e23ccc0a | 2434 | struct vb2_buffer *vb; |
ce9c2244 | 2435 | unsigned int buffer = 0, plane = 0; |
e23ccc0a | 2436 | int ret; |
7f841459 | 2437 | unsigned long length; |
e23ccc0a PO |
2438 | |
2439 | if (q->memory != V4L2_MEMORY_MMAP) { | |
3050040b | 2440 | dprintk(1, "queue is not currently set up for mmap\n"); |
e23ccc0a PO |
2441 | return -EINVAL; |
2442 | } | |
2443 | ||
2444 | /* | |
2445 | * Check memory area access mode. | |
2446 | */ | |
2447 | if (!(vma->vm_flags & VM_SHARED)) { | |
3050040b | 2448 | dprintk(1, "invalid vma flags, VM_SHARED needed\n"); |
e23ccc0a PO |
2449 | return -EINVAL; |
2450 | } | |
2451 | if (V4L2_TYPE_IS_OUTPUT(q->type)) { | |
2452 | if (!(vma->vm_flags & VM_WRITE)) { | |
3050040b | 2453 | dprintk(1, "invalid vma flags, VM_WRITE needed\n"); |
e23ccc0a PO |
2454 | return -EINVAL; |
2455 | } | |
2456 | } else { | |
2457 | if (!(vma->vm_flags & VM_READ)) { | |
3050040b | 2458 | dprintk(1, "invalid vma flags, VM_READ needed\n"); |
e23ccc0a PO |
2459 | return -EINVAL; |
2460 | } | |
2461 | } | |
74753cff HV |
2462 | if (vb2_fileio_is_active(q)) { |
2463 | dprintk(1, "mmap: file io in progress\n"); | |
2464 | return -EBUSY; | |
2465 | } | |
e23ccc0a PO |
2466 | |
2467 | /* | |
2468 | * Find the plane corresponding to the offset passed by userspace. | |
2469 | */ | |
2470 | ret = __find_plane_by_offset(q, off, &buffer, &plane); | |
2471 | if (ret) | |
2472 | return ret; | |
2473 | ||
2474 | vb = q->bufs[buffer]; | |
e23ccc0a | 2475 | |
7f841459 MCC |
2476 | /* |
2477 | * MMAP requires page_aligned buffers. | |
2478 | * The buffer length was page_aligned at __vb2_buf_mem_alloc(), | |
2479 | * so, we need to do the same here. | |
2480 | */ | |
2481 | length = PAGE_ALIGN(vb->v4l2_planes[plane].length); | |
2482 | if (length < (vma->vm_end - vma->vm_start)) { | |
2483 | dprintk(1, | |
2484 | "MMAP invalid, as it would overflow buffer length\n"); | |
068a0df7 SWK |
2485 | return -EINVAL; |
2486 | } | |
2487 | ||
b5b4541e | 2488 | ret = call_memop(vb, mmap, vb->planes[plane].mem_priv, vma); |
a1d36d8c | 2489 | if (ret) |
e23ccc0a PO |
2490 | return ret; |
2491 | ||
3050040b | 2492 | dprintk(3, "buffer %d, plane %d successfully mapped\n", buffer, plane); |
e23ccc0a PO |
2493 | return 0; |
2494 | } | |
2495 | EXPORT_SYMBOL_GPL(vb2_mmap); | |
2496 | ||
6f524ec1 SJ |
2497 | #ifndef CONFIG_MMU |
2498 | unsigned long vb2_get_unmapped_area(struct vb2_queue *q, | |
2499 | unsigned long addr, | |
2500 | unsigned long len, | |
2501 | unsigned long pgoff, | |
2502 | unsigned long flags) | |
2503 | { | |
2504 | unsigned long off = pgoff << PAGE_SHIFT; | |
2505 | struct vb2_buffer *vb; | |
2506 | unsigned int buffer, plane; | |
2507 | int ret; | |
2508 | ||
2509 | if (q->memory != V4L2_MEMORY_MMAP) { | |
3050040b | 2510 | dprintk(1, "queue is not currently set up for mmap\n"); |
6f524ec1 SJ |
2511 | return -EINVAL; |
2512 | } | |
2513 | ||
2514 | /* | |
2515 | * Find the plane corresponding to the offset passed by userspace. | |
2516 | */ | |
2517 | ret = __find_plane_by_offset(q, off, &buffer, &plane); | |
2518 | if (ret) | |
2519 | return ret; | |
2520 | ||
2521 | vb = q->bufs[buffer]; | |
2522 | ||
2523 | return (unsigned long)vb2_plane_vaddr(vb, plane); | |
2524 | } | |
2525 | EXPORT_SYMBOL_GPL(vb2_get_unmapped_area); | |
2526 | #endif | |
2527 | ||
b25748fe MS |
2528 | static int __vb2_init_fileio(struct vb2_queue *q, int read); |
2529 | static int __vb2_cleanup_fileio(struct vb2_queue *q); | |
e23ccc0a PO |
2530 | |
2531 | /** | |
2532 | * vb2_poll() - implements poll userspace operation | |
2533 | * @q: videobuf2 queue | |
2534 | * @file: file argument passed to the poll file operation handler | |
2535 | * @wait: wait argument passed to the poll file operation handler | |
2536 | * | |
2537 | * This function implements poll file operation handler for a driver. | |
2538 | * For CAPTURE queues, if a buffer is ready to be dequeued, the userspace will | |
2539 | * be informed that the file descriptor of a video device is available for | |
2540 | * reading. | |
2541 | * For OUTPUT queues, if a buffer is ready to be dequeued, the file descriptor | |
2542 | * will be reported as available for writing. | |
2543 | * | |
95213ceb HV |
2544 | * If the driver uses struct v4l2_fh, then vb2_poll() will also check for any |
2545 | * pending events. | |
2546 | * | |
e23ccc0a PO |
2547 | * The return values from this function are intended to be directly returned |
2548 | * from poll handler in driver. | |
2549 | */ | |
2550 | unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait) | |
2551 | { | |
95213ceb | 2552 | struct video_device *vfd = video_devdata(file); |
bf5c7cbb | 2553 | unsigned long req_events = poll_requested_events(wait); |
e23ccc0a | 2554 | struct vb2_buffer *vb = NULL; |
95213ceb HV |
2555 | unsigned int res = 0; |
2556 | unsigned long flags; | |
2557 | ||
2558 | if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) { | |
2559 | struct v4l2_fh *fh = file->private_data; | |
2560 | ||
2561 | if (v4l2_event_pending(fh)) | |
2562 | res = POLLPRI; | |
2563 | else if (req_events & POLLPRI) | |
2564 | poll_wait(file, &fh->wait, wait); | |
2565 | } | |
e23ccc0a | 2566 | |
cd13823f HV |
2567 | if (!V4L2_TYPE_IS_OUTPUT(q->type) && !(req_events & (POLLIN | POLLRDNORM))) |
2568 | return res; | |
2569 | if (V4L2_TYPE_IS_OUTPUT(q->type) && !(req_events & (POLLOUT | POLLWRNORM))) | |
2570 | return res; | |
2571 | ||
b25748fe | 2572 | /* |
4ffabdb3 | 2573 | * Start file I/O emulator only if streaming API has not been used yet. |
b25748fe | 2574 | */ |
74753cff | 2575 | if (q->num_buffers == 0 && !vb2_fileio_is_active(q)) { |
bf5c7cbb HV |
2576 | if (!V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_READ) && |
2577 | (req_events & (POLLIN | POLLRDNORM))) { | |
95213ceb HV |
2578 | if (__vb2_init_fileio(q, 1)) |
2579 | return res | POLLERR; | |
b25748fe | 2580 | } |
bf5c7cbb HV |
2581 | if (V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_WRITE) && |
2582 | (req_events & (POLLOUT | POLLWRNORM))) { | |
95213ceb HV |
2583 | if (__vb2_init_fileio(q, 0)) |
2584 | return res | POLLERR; | |
b25748fe MS |
2585 | /* |
2586 | * Write to OUTPUT queue can be done immediately. | |
2587 | */ | |
95213ceb | 2588 | return res | POLLOUT | POLLWRNORM; |
b25748fe MS |
2589 | } |
2590 | } | |
2591 | ||
e23ccc0a | 2592 | /* |
9241650d | 2593 | * There is nothing to wait for if no buffer has been queued and the |
4bb7267d | 2594 | * queue isn't streaming, or if the error flag is set. |
e23ccc0a | 2595 | */ |
4bb7267d | 2596 | if ((list_empty(&q->queued_list) && !vb2_is_streaming(q)) || q->error) |
95213ceb | 2597 | return res | POLLERR; |
e23ccc0a | 2598 | |
1612f20e HV |
2599 | /* |
2600 | * For output streams you can write as long as there are fewer buffers | |
2601 | * queued than there are buffers available. | |
2602 | */ | |
2603 | if (V4L2_TYPE_IS_OUTPUT(q->type) && q->queued_count < q->num_buffers) | |
2604 | return res | POLLOUT | POLLWRNORM; | |
2605 | ||
412cb87d SWK |
2606 | if (list_empty(&q->done_list)) |
2607 | poll_wait(file, &q->done_wq, wait); | |
e23ccc0a PO |
2608 | |
2609 | /* | |
2610 | * Take first buffer available for dequeuing. | |
2611 | */ | |
2612 | spin_lock_irqsave(&q->done_lock, flags); | |
2613 | if (!list_empty(&q->done_list)) | |
2614 | vb = list_first_entry(&q->done_list, struct vb2_buffer, | |
2615 | done_entry); | |
2616 | spin_unlock_irqrestore(&q->done_lock, flags); | |
2617 | ||
2618 | if (vb && (vb->state == VB2_BUF_STATE_DONE | |
2619 | || vb->state == VB2_BUF_STATE_ERROR)) { | |
95213ceb HV |
2620 | return (V4L2_TYPE_IS_OUTPUT(q->type)) ? |
2621 | res | POLLOUT | POLLWRNORM : | |
2622 | res | POLLIN | POLLRDNORM; | |
e23ccc0a | 2623 | } |
95213ceb | 2624 | return res; |
e23ccc0a PO |
2625 | } |
2626 | EXPORT_SYMBOL_GPL(vb2_poll); | |
2627 | ||
2628 | /** | |
2629 | * vb2_queue_init() - initialize a videobuf2 queue | |
2630 | * @q: videobuf2 queue; this structure should be allocated in driver | |
2631 | * | |
2632 | * The vb2_queue structure should be allocated by the driver. The driver is | |
2633 | * responsible of clearing it's content and setting initial values for some | |
2634 | * required entries before calling this function. | |
2635 | * q->ops, q->mem_ops, q->type and q->io_modes are mandatory. Please refer | |
2636 | * to the struct vb2_queue description in include/media/videobuf2-core.h | |
2637 | * for more information. | |
2638 | */ | |
2639 | int vb2_queue_init(struct vb2_queue *q) | |
2640 | { | |
896f38f5 EG |
2641 | /* |
2642 | * Sanity check | |
2643 | */ | |
2644 | if (WARN_ON(!q) || | |
2645 | WARN_ON(!q->ops) || | |
2646 | WARN_ON(!q->mem_ops) || | |
2647 | WARN_ON(!q->type) || | |
2648 | WARN_ON(!q->io_modes) || | |
2649 | WARN_ON(!q->ops->queue_setup) || | |
6aa69f99 | 2650 | WARN_ON(!q->ops->buf_queue) || |
872484ce SA |
2651 | WARN_ON(q->timestamp_flags & |
2652 | ~(V4L2_BUF_FLAG_TIMESTAMP_MASK | | |
2653 | V4L2_BUF_FLAG_TSTAMP_SRC_MASK))) | |
896f38f5 | 2654 | return -EINVAL; |
e23ccc0a | 2655 | |
6aa69f99 | 2656 | /* Warn that the driver should choose an appropriate timestamp type */ |
c57ff792 SA |
2657 | WARN_ON((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == |
2658 | V4L2_BUF_FLAG_TIMESTAMP_UNKNOWN); | |
6aa69f99 | 2659 | |
e23ccc0a PO |
2660 | INIT_LIST_HEAD(&q->queued_list); |
2661 | INIT_LIST_HEAD(&q->done_list); | |
2662 | spin_lock_init(&q->done_lock); | |
2663 | init_waitqueue_head(&q->done_wq); | |
2664 | ||
2665 | if (q->buf_struct_size == 0) | |
2666 | q->buf_struct_size = sizeof(struct vb2_buffer); | |
2667 | ||
2668 | return 0; | |
2669 | } | |
2670 | EXPORT_SYMBOL_GPL(vb2_queue_init); | |
2671 | ||
2672 | /** | |
2673 | * vb2_queue_release() - stop streaming, release the queue and free memory | |
2674 | * @q: videobuf2 queue | |
2675 | * | |
2676 | * This function stops streaming and performs necessary clean ups, including | |
2677 | * freeing video buffer memory. The driver is responsible for freeing | |
2678 | * the vb2_queue structure itself. | |
2679 | */ | |
2680 | void vb2_queue_release(struct vb2_queue *q) | |
2681 | { | |
b25748fe | 2682 | __vb2_cleanup_fileio(q); |
e23ccc0a | 2683 | __vb2_queue_cancel(q); |
2d86401c | 2684 | __vb2_queue_free(q, q->num_buffers); |
e23ccc0a PO |
2685 | } |
2686 | EXPORT_SYMBOL_GPL(vb2_queue_release); | |
2687 | ||
b25748fe MS |
2688 | /** |
2689 | * struct vb2_fileio_buf - buffer context used by file io emulator | |
2690 | * | |
2691 | * vb2 provides a compatibility layer and emulator of file io (read and | |
2692 | * write) calls on top of streaming API. This structure is used for | |
2693 | * tracking context related to the buffers. | |
2694 | */ | |
2695 | struct vb2_fileio_buf { | |
2696 | void *vaddr; | |
2697 | unsigned int size; | |
2698 | unsigned int pos; | |
2699 | unsigned int queued:1; | |
2700 | }; | |
2701 | ||
2702 | /** | |
2703 | * struct vb2_fileio_data - queue context used by file io emulator | |
2704 | * | |
4e5a4d8a HV |
2705 | * @cur_index: the index of the buffer currently being read from or |
2706 | * written to. If equal to q->num_buffers then a new buffer | |
2707 | * must be dequeued. | |
2708 | * @initial_index: in the read() case all buffers are queued up immediately | |
2709 | * in __vb2_init_fileio() and __vb2_perform_fileio() just cycles | |
2710 | * buffers. However, in the write() case no buffers are initially | |
2711 | * queued, instead whenever a buffer is full it is queued up by | |
2712 | * __vb2_perform_fileio(). Only once all available buffers have | |
2713 | * been queued up will __vb2_perform_fileio() start to dequeue | |
2714 | * buffers. This means that initially __vb2_perform_fileio() | |
2715 | * needs to know what buffer index to use when it is queuing up | |
2716 | * the buffers for the first time. That initial index is stored | |
2717 | * in this field. Once it is equal to q->num_buffers all | |
2718 | * available buffers have been queued and __vb2_perform_fileio() | |
2719 | * should start the normal dequeue/queue cycle. | |
2720 | * | |
b25748fe MS |
2721 | * vb2 provides a compatibility layer and emulator of file io (read and |
2722 | * write) calls on top of streaming API. For proper operation it required | |
2723 | * this structure to save the driver state between each call of the read | |
2724 | * or write function. | |
2725 | */ | |
2726 | struct vb2_fileio_data { | |
2727 | struct v4l2_requestbuffers req; | |
7bb6edd3 | 2728 | struct v4l2_plane p; |
b25748fe MS |
2729 | struct v4l2_buffer b; |
2730 | struct vb2_fileio_buf bufs[VIDEO_MAX_FRAME]; | |
4e5a4d8a HV |
2731 | unsigned int cur_index; |
2732 | unsigned int initial_index; | |
b25748fe MS |
2733 | unsigned int q_count; |
2734 | unsigned int dq_count; | |
2735 | unsigned int flags; | |
2736 | }; | |
2737 | ||
2738 | /** | |
2739 | * __vb2_init_fileio() - initialize file io emulator | |
2740 | * @q: videobuf2 queue | |
2741 | * @read: mode selector (1 means read, 0 means write) | |
2742 | */ | |
2743 | static int __vb2_init_fileio(struct vb2_queue *q, int read) | |
2744 | { | |
2745 | struct vb2_fileio_data *fileio; | |
2746 | int i, ret; | |
2747 | unsigned int count = 0; | |
2748 | ||
2749 | /* | |
2750 | * Sanity check | |
2751 | */ | |
e4d25816 HV |
2752 | if (WARN_ON((read && !(q->io_modes & VB2_READ)) || |
2753 | (!read && !(q->io_modes & VB2_WRITE)))) | |
2754 | return -EINVAL; | |
b25748fe MS |
2755 | |
2756 | /* | |
2757 | * Check if device supports mapping buffers to kernel virtual space. | |
2758 | */ | |
2759 | if (!q->mem_ops->vaddr) | |
2760 | return -EBUSY; | |
2761 | ||
2762 | /* | |
2763 | * Check if streaming api has not been already activated. | |
2764 | */ | |
2765 | if (q->streaming || q->num_buffers > 0) | |
2766 | return -EBUSY; | |
2767 | ||
2768 | /* | |
2769 | * Start with count 1, driver can increase it in queue_setup() | |
2770 | */ | |
2771 | count = 1; | |
2772 | ||
2773 | dprintk(3, "setting up file io: mode %s, count %d, flags %08x\n", | |
2774 | (read) ? "read" : "write", count, q->io_flags); | |
2775 | ||
2776 | fileio = kzalloc(sizeof(struct vb2_fileio_data), GFP_KERNEL); | |
2777 | if (fileio == NULL) | |
2778 | return -ENOMEM; | |
2779 | ||
2780 | fileio->flags = q->io_flags; | |
2781 | ||
2782 | /* | |
2783 | * Request buffers and use MMAP type to force driver | |
2784 | * to allocate buffers by itself. | |
2785 | */ | |
2786 | fileio->req.count = count; | |
2787 | fileio->req.memory = V4L2_MEMORY_MMAP; | |
2788 | fileio->req.type = q->type; | |
74753cff HV |
2789 | q->fileio = fileio; |
2790 | ret = __reqbufs(q, &fileio->req); | |
b25748fe MS |
2791 | if (ret) |
2792 | goto err_kfree; | |
2793 | ||
2794 | /* | |
2795 | * Check if plane_count is correct | |
2796 | * (multiplane buffers are not supported). | |
2797 | */ | |
2798 | if (q->bufs[0]->num_planes != 1) { | |
b25748fe MS |
2799 | ret = -EBUSY; |
2800 | goto err_reqbufs; | |
2801 | } | |
2802 | ||
2803 | /* | |
2804 | * Get kernel address of each buffer. | |
2805 | */ | |
2806 | for (i = 0; i < q->num_buffers; i++) { | |
2807 | fileio->bufs[i].vaddr = vb2_plane_vaddr(q->bufs[i], 0); | |
5dd6946c WY |
2808 | if (fileio->bufs[i].vaddr == NULL) { |
2809 | ret = -EINVAL; | |
b25748fe | 2810 | goto err_reqbufs; |
5dd6946c | 2811 | } |
b25748fe MS |
2812 | fileio->bufs[i].size = vb2_plane_size(q->bufs[i], 0); |
2813 | } | |
2814 | ||
2815 | /* | |
2816 | * Read mode requires pre queuing of all buffers. | |
2817 | */ | |
2818 | if (read) { | |
7bb6edd3 HV |
2819 | bool is_multiplanar = V4L2_TYPE_IS_MULTIPLANAR(q->type); |
2820 | ||
b25748fe MS |
2821 | /* |
2822 | * Queue all buffers. | |
2823 | */ | |
2824 | for (i = 0; i < q->num_buffers; i++) { | |
2825 | struct v4l2_buffer *b = &fileio->b; | |
7bb6edd3 | 2826 | |
b25748fe MS |
2827 | memset(b, 0, sizeof(*b)); |
2828 | b->type = q->type; | |
7bb6edd3 HV |
2829 | if (is_multiplanar) { |
2830 | memset(&fileio->p, 0, sizeof(fileio->p)); | |
2831 | b->m.planes = &fileio->p; | |
2832 | b->length = 1; | |
2833 | } | |
b25748fe MS |
2834 | b->memory = q->memory; |
2835 | b->index = i; | |
74753cff | 2836 | ret = vb2_internal_qbuf(q, b); |
b25748fe MS |
2837 | if (ret) |
2838 | goto err_reqbufs; | |
2839 | fileio->bufs[i].queued = 1; | |
2840 | } | |
4e5a4d8a HV |
2841 | /* |
2842 | * All buffers have been queued, so mark that by setting | |
2843 | * initial_index to q->num_buffers | |
2844 | */ | |
2845 | fileio->initial_index = q->num_buffers; | |
2846 | fileio->cur_index = q->num_buffers; | |
b25748fe MS |
2847 | } |
2848 | ||
02f142ec HV |
2849 | /* |
2850 | * Start streaming. | |
2851 | */ | |
74753cff | 2852 | ret = vb2_internal_streamon(q, q->type); |
02f142ec HV |
2853 | if (ret) |
2854 | goto err_reqbufs; | |
2855 | ||
b25748fe MS |
2856 | return ret; |
2857 | ||
2858 | err_reqbufs: | |
a67e1722 | 2859 | fileio->req.count = 0; |
74753cff | 2860 | __reqbufs(q, &fileio->req); |
b25748fe MS |
2861 | |
2862 | err_kfree: | |
74753cff | 2863 | q->fileio = NULL; |
b25748fe MS |
2864 | kfree(fileio); |
2865 | return ret; | |
2866 | } | |
2867 | ||
2868 | /** | |
2869 | * __vb2_cleanup_fileio() - free resourced used by file io emulator | |
2870 | * @q: videobuf2 queue | |
2871 | */ | |
2872 | static int __vb2_cleanup_fileio(struct vb2_queue *q) | |
2873 | { | |
2874 | struct vb2_fileio_data *fileio = q->fileio; | |
2875 | ||
2876 | if (fileio) { | |
b2f2f047 | 2877 | vb2_internal_streamoff(q, q->type); |
b25748fe | 2878 | q->fileio = NULL; |
b25748fe MS |
2879 | fileio->req.count = 0; |
2880 | vb2_reqbufs(q, &fileio->req); | |
2881 | kfree(fileio); | |
2882 | dprintk(3, "file io emulator closed\n"); | |
2883 | } | |
2884 | return 0; | |
2885 | } | |
2886 | ||
2887 | /** | |
2888 | * __vb2_perform_fileio() - perform a single file io (read or write) operation | |
2889 | * @q: videobuf2 queue | |
2890 | * @data: pointed to target userspace buffer | |
2891 | * @count: number of bytes to read or write | |
2892 | * @ppos: file handle position tracking pointer | |
2893 | * @nonblock: mode selector (1 means blocking calls, 0 means nonblocking) | |
2894 | * @read: access mode selector (1 means read, 0 means write) | |
2895 | */ | |
2896 | static size_t __vb2_perform_fileio(struct vb2_queue *q, char __user *data, size_t count, | |
2897 | loff_t *ppos, int nonblock, int read) | |
2898 | { | |
2899 | struct vb2_fileio_data *fileio; | |
2900 | struct vb2_fileio_buf *buf; | |
7bb6edd3 | 2901 | bool is_multiplanar = V4L2_TYPE_IS_MULTIPLANAR(q->type); |
ebd7c505 HV |
2902 | /* |
2903 | * When using write() to write data to an output video node the vb2 core | |
2904 | * should set timestamps if V4L2_BUF_FLAG_TIMESTAMP_COPY is set. Nobody | |
2905 | * else is able to provide this information with the write() operation. | |
2906 | */ | |
2907 | bool set_timestamp = !read && | |
2908 | (q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == | |
2909 | V4L2_BUF_FLAG_TIMESTAMP_COPY; | |
b25748fe MS |
2910 | int ret, index; |
2911 | ||
fd4354cf | 2912 | dprintk(3, "mode %s, offset %ld, count %zd, %sblocking\n", |
b25748fe MS |
2913 | read ? "read" : "write", (long)*ppos, count, |
2914 | nonblock ? "non" : ""); | |
2915 | ||
2916 | if (!data) | |
2917 | return -EINVAL; | |
2918 | ||
2919 | /* | |
2920 | * Initialize emulator on first call. | |
2921 | */ | |
74753cff | 2922 | if (!vb2_fileio_is_active(q)) { |
b25748fe | 2923 | ret = __vb2_init_fileio(q, read); |
fd4354cf | 2924 | dprintk(3, "vb2_init_fileio result: %d\n", ret); |
b25748fe MS |
2925 | if (ret) |
2926 | return ret; | |
2927 | } | |
2928 | fileio = q->fileio; | |
2929 | ||
b25748fe MS |
2930 | /* |
2931 | * Check if we need to dequeue the buffer. | |
2932 | */ | |
4e5a4d8a | 2933 | index = fileio->cur_index; |
88e26870 | 2934 | if (index >= q->num_buffers) { |
b25748fe MS |
2935 | /* |
2936 | * Call vb2_dqbuf to get buffer back. | |
2937 | */ | |
2938 | memset(&fileio->b, 0, sizeof(fileio->b)); | |
2939 | fileio->b.type = q->type; | |
2940 | fileio->b.memory = q->memory; | |
7bb6edd3 HV |
2941 | if (is_multiplanar) { |
2942 | memset(&fileio->p, 0, sizeof(fileio->p)); | |
2943 | fileio->b.m.planes = &fileio->p; | |
2944 | fileio->b.length = 1; | |
2945 | } | |
b2f2f047 | 2946 | ret = vb2_internal_dqbuf(q, &fileio->b, nonblock); |
fd4354cf | 2947 | dprintk(5, "vb2_dqbuf result: %d\n", ret); |
b25748fe | 2948 | if (ret) |
b2f2f047 | 2949 | return ret; |
b25748fe MS |
2950 | fileio->dq_count += 1; |
2951 | ||
4e5a4d8a | 2952 | fileio->cur_index = index = fileio->b.index; |
88e26870 HV |
2953 | buf = &fileio->bufs[index]; |
2954 | ||
b25748fe MS |
2955 | /* |
2956 | * Get number of bytes filled by the driver | |
2957 | */ | |
88e26870 | 2958 | buf->pos = 0; |
b25748fe | 2959 | buf->queued = 0; |
88e26870 HV |
2960 | buf->size = read ? vb2_get_plane_payload(q->bufs[index], 0) |
2961 | : vb2_plane_size(q->bufs[index], 0); | |
2962 | } else { | |
2963 | buf = &fileio->bufs[index]; | |
b25748fe MS |
2964 | } |
2965 | ||
2966 | /* | |
2967 | * Limit count on last few bytes of the buffer. | |
2968 | */ | |
2969 | if (buf->pos + count > buf->size) { | |
2970 | count = buf->size - buf->pos; | |
08b99e26 | 2971 | dprintk(5, "reducing read count: %zd\n", count); |
b25748fe MS |
2972 | } |
2973 | ||
2974 | /* | |
2975 | * Transfer data to userspace. | |
2976 | */ | |
fd4354cf | 2977 | dprintk(3, "copying %zd bytes - buffer %d, offset %u\n", |
b25748fe MS |
2978 | count, index, buf->pos); |
2979 | if (read) | |
2980 | ret = copy_to_user(data, buf->vaddr + buf->pos, count); | |
2981 | else | |
2982 | ret = copy_from_user(buf->vaddr + buf->pos, data, count); | |
2983 | if (ret) { | |
fd4354cf | 2984 | dprintk(3, "error copying data\n"); |
b2f2f047 | 2985 | return -EFAULT; |
b25748fe MS |
2986 | } |
2987 | ||
2988 | /* | |
2989 | * Update counters. | |
2990 | */ | |
2991 | buf->pos += count; | |
2992 | *ppos += count; | |
2993 | ||
2994 | /* | |
2995 | * Queue next buffer if required. | |
2996 | */ | |
2997 | if (buf->pos == buf->size || | |
2998 | (!read && (fileio->flags & VB2_FILEIO_WRITE_IMMEDIATELY))) { | |
2999 | /* | |
3000 | * Check if this is the last buffer to read. | |
3001 | */ | |
3002 | if (read && (fileio->flags & VB2_FILEIO_READ_ONCE) && | |
3003 | fileio->dq_count == 1) { | |
fd4354cf | 3004 | dprintk(3, "read limit reached\n"); |
b25748fe MS |
3005 | return __vb2_cleanup_fileio(q); |
3006 | } | |
3007 | ||
3008 | /* | |
3009 | * Call vb2_qbuf and give buffer to the driver. | |
3010 | */ | |
3011 | memset(&fileio->b, 0, sizeof(fileio->b)); | |
3012 | fileio->b.type = q->type; | |
3013 | fileio->b.memory = q->memory; | |
3014 | fileio->b.index = index; | |
3015 | fileio->b.bytesused = buf->pos; | |
7bb6edd3 HV |
3016 | if (is_multiplanar) { |
3017 | memset(&fileio->p, 0, sizeof(fileio->p)); | |
3018 | fileio->p.bytesused = buf->pos; | |
3019 | fileio->b.m.planes = &fileio->p; | |
3020 | fileio->b.length = 1; | |
3021 | } | |
ebd7c505 HV |
3022 | if (set_timestamp) |
3023 | v4l2_get_timestamp(&fileio->b.timestamp); | |
b2f2f047 | 3024 | ret = vb2_internal_qbuf(q, &fileio->b); |
fd4354cf | 3025 | dprintk(5, "vb2_dbuf result: %d\n", ret); |
b25748fe | 3026 | if (ret) |
b2f2f047 | 3027 | return ret; |
b25748fe MS |
3028 | |
3029 | /* | |
3030 | * Buffer has been queued, update the status | |
3031 | */ | |
3032 | buf->pos = 0; | |
3033 | buf->queued = 1; | |
88e26870 | 3034 | buf->size = vb2_plane_size(q->bufs[index], 0); |
b25748fe | 3035 | fileio->q_count += 1; |
4e5a4d8a HV |
3036 | /* |
3037 | * If we are queuing up buffers for the first time, then | |
3038 | * increase initial_index by one. | |
3039 | */ | |
3040 | if (fileio->initial_index < q->num_buffers) | |
3041 | fileio->initial_index++; | |
3042 | /* | |
3043 | * The next buffer to use is either a buffer that's going to be | |
3044 | * queued for the first time (initial_index < q->num_buffers) | |
3045 | * or it is equal to q->num_buffers, meaning that the next | |
3046 | * time we need to dequeue a buffer since we've now queued up | |
3047 | * all the 'first time' buffers. | |
3048 | */ | |
3049 | fileio->cur_index = fileio->initial_index; | |
b25748fe MS |
3050 | } |
3051 | ||
3052 | /* | |
3053 | * Return proper number of bytes processed. | |
3054 | */ | |
3055 | if (ret == 0) | |
3056 | ret = count; | |
b25748fe MS |
3057 | return ret; |
3058 | } | |
3059 | ||
3060 | size_t vb2_read(struct vb2_queue *q, char __user *data, size_t count, | |
3061 | loff_t *ppos, int nonblocking) | |
3062 | { | |
3063 | return __vb2_perform_fileio(q, data, count, ppos, nonblocking, 1); | |
3064 | } | |
3065 | EXPORT_SYMBOL_GPL(vb2_read); | |
3066 | ||
819585bc | 3067 | size_t vb2_write(struct vb2_queue *q, const char __user *data, size_t count, |
b25748fe MS |
3068 | loff_t *ppos, int nonblocking) |
3069 | { | |
819585bc RR |
3070 | return __vb2_perform_fileio(q, (char __user *) data, count, |
3071 | ppos, nonblocking, 0); | |
b25748fe MS |
3072 | } |
3073 | EXPORT_SYMBOL_GPL(vb2_write); | |
3074 | ||
3415a89f HV |
3075 | struct vb2_threadio_data { |
3076 | struct task_struct *thread; | |
3077 | vb2_thread_fnc fnc; | |
3078 | void *priv; | |
3079 | bool stop; | |
3080 | }; | |
3081 | ||
3082 | static int vb2_thread(void *data) | |
3083 | { | |
3084 | struct vb2_queue *q = data; | |
3085 | struct vb2_threadio_data *threadio = q->threadio; | |
3086 | struct vb2_fileio_data *fileio = q->fileio; | |
3087 | bool set_timestamp = false; | |
3088 | int prequeue = 0; | |
3089 | int index = 0; | |
3090 | int ret = 0; | |
3091 | ||
3092 | if (V4L2_TYPE_IS_OUTPUT(q->type)) { | |
3093 | prequeue = q->num_buffers; | |
3094 | set_timestamp = | |
3095 | (q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == | |
3096 | V4L2_BUF_FLAG_TIMESTAMP_COPY; | |
3097 | } | |
3098 | ||
3099 | set_freezable(); | |
3100 | ||
3101 | for (;;) { | |
3102 | struct vb2_buffer *vb; | |
3103 | ||
3104 | /* | |
3105 | * Call vb2_dqbuf to get buffer back. | |
3106 | */ | |
3107 | memset(&fileio->b, 0, sizeof(fileio->b)); | |
3108 | fileio->b.type = q->type; | |
3109 | fileio->b.memory = q->memory; | |
3110 | if (prequeue) { | |
3111 | fileio->b.index = index++; | |
3112 | prequeue--; | |
3113 | } else { | |
3114 | call_void_qop(q, wait_finish, q); | |
3115 | ret = vb2_internal_dqbuf(q, &fileio->b, 0); | |
3116 | call_void_qop(q, wait_prepare, q); | |
3117 | dprintk(5, "file io: vb2_dqbuf result: %d\n", ret); | |
3118 | } | |
3119 | if (threadio->stop) | |
3120 | break; | |
3121 | if (ret) | |
3122 | break; | |
3123 | try_to_freeze(); | |
3124 | ||
3125 | vb = q->bufs[fileio->b.index]; | |
3126 | if (!(fileio->b.flags & V4L2_BUF_FLAG_ERROR)) | |
3127 | ret = threadio->fnc(vb, threadio->priv); | |
3128 | if (ret) | |
3129 | break; | |
3130 | call_void_qop(q, wait_finish, q); | |
3131 | if (set_timestamp) | |
3132 | v4l2_get_timestamp(&fileio->b.timestamp); | |
3133 | ret = vb2_internal_qbuf(q, &fileio->b); | |
3134 | call_void_qop(q, wait_prepare, q); | |
3135 | if (ret) | |
3136 | break; | |
3137 | } | |
3138 | ||
3139 | /* Hmm, linux becomes *very* unhappy without this ... */ | |
3140 | while (!kthread_should_stop()) { | |
3141 | set_current_state(TASK_INTERRUPTIBLE); | |
3142 | schedule(); | |
3143 | } | |
3144 | return 0; | |
3145 | } | |
3146 | ||
3147 | /* | |
3148 | * This function should not be used for anything else but the videobuf2-dvb | |
3149 | * support. If you think you have another good use-case for this, then please | |
3150 | * contact the linux-media mailinglist first. | |
3151 | */ | |
3152 | int vb2_thread_start(struct vb2_queue *q, vb2_thread_fnc fnc, void *priv, | |
3153 | const char *thread_name) | |
3154 | { | |
3155 | struct vb2_threadio_data *threadio; | |
3156 | int ret = 0; | |
3157 | ||
3158 | if (q->threadio) | |
3159 | return -EBUSY; | |
3160 | if (vb2_is_busy(q)) | |
3161 | return -EBUSY; | |
3162 | if (WARN_ON(q->fileio)) | |
3163 | return -EBUSY; | |
3164 | ||
3165 | threadio = kzalloc(sizeof(*threadio), GFP_KERNEL); | |
3166 | if (threadio == NULL) | |
3167 | return -ENOMEM; | |
3168 | threadio->fnc = fnc; | |
3169 | threadio->priv = priv; | |
3170 | ||
3171 | ret = __vb2_init_fileio(q, !V4L2_TYPE_IS_OUTPUT(q->type)); | |
3172 | dprintk(3, "file io: vb2_init_fileio result: %d\n", ret); | |
3173 | if (ret) | |
3174 | goto nomem; | |
3175 | q->threadio = threadio; | |
3176 | threadio->thread = kthread_run(vb2_thread, q, "vb2-%s", thread_name); | |
3177 | if (IS_ERR(threadio->thread)) { | |
3178 | ret = PTR_ERR(threadio->thread); | |
3179 | threadio->thread = NULL; | |
3180 | goto nothread; | |
3181 | } | |
3182 | return 0; | |
3183 | ||
3184 | nothread: | |
3185 | __vb2_cleanup_fileio(q); | |
3186 | nomem: | |
3187 | kfree(threadio); | |
3188 | return ret; | |
3189 | } | |
3190 | EXPORT_SYMBOL_GPL(vb2_thread_start); | |
3191 | ||
3192 | int vb2_thread_stop(struct vb2_queue *q) | |
3193 | { | |
3194 | struct vb2_threadio_data *threadio = q->threadio; | |
3195 | struct vb2_fileio_data *fileio = q->fileio; | |
3196 | int err; | |
3197 | ||
3198 | if (threadio == NULL) | |
3199 | return 0; | |
3200 | call_void_qop(q, wait_finish, q); | |
3201 | threadio->stop = true; | |
3202 | vb2_internal_streamoff(q, q->type); | |
3203 | call_void_qop(q, wait_prepare, q); | |
3204 | q->fileio = NULL; | |
3205 | fileio->req.count = 0; | |
3206 | vb2_reqbufs(q, &fileio->req); | |
3207 | kfree(fileio); | |
3208 | err = kthread_stop(threadio->thread); | |
3209 | threadio->thread = NULL; | |
3210 | kfree(threadio); | |
3211 | q->fileio = NULL; | |
3212 | q->threadio = NULL; | |
3213 | return err; | |
3214 | } | |
3215 | EXPORT_SYMBOL_GPL(vb2_thread_stop); | |
4c1ffcaa HV |
3216 | |
3217 | /* | |
3218 | * The following functions are not part of the vb2 core API, but are helper | |
3219 | * functions that plug into struct v4l2_ioctl_ops, struct v4l2_file_operations | |
3220 | * and struct vb2_ops. | |
3221 | * They contain boilerplate code that most if not all drivers have to do | |
3222 | * and so they simplify the driver code. | |
3223 | */ | |
3224 | ||
3225 | /* The queue is busy if there is a owner and you are not that owner. */ | |
3226 | static inline bool vb2_queue_is_busy(struct video_device *vdev, struct file *file) | |
3227 | { | |
3228 | return vdev->queue->owner && vdev->queue->owner != file->private_data; | |
3229 | } | |
3230 | ||
3231 | /* vb2 ioctl helpers */ | |
3232 | ||
3233 | int vb2_ioctl_reqbufs(struct file *file, void *priv, | |
3234 | struct v4l2_requestbuffers *p) | |
3235 | { | |
3236 | struct video_device *vdev = video_devdata(file); | |
3237 | int res = __verify_memory_type(vdev->queue, p->memory, p->type); | |
3238 | ||
3239 | if (res) | |
3240 | return res; | |
3241 | if (vb2_queue_is_busy(vdev, file)) | |
3242 | return -EBUSY; | |
3243 | res = __reqbufs(vdev->queue, p); | |
3244 | /* If count == 0, then the owner has released all buffers and he | |
3245 | is no longer owner of the queue. Otherwise we have a new owner. */ | |
3246 | if (res == 0) | |
3247 | vdev->queue->owner = p->count ? file->private_data : NULL; | |
3248 | return res; | |
3249 | } | |
3250 | EXPORT_SYMBOL_GPL(vb2_ioctl_reqbufs); | |
3251 | ||
3252 | int vb2_ioctl_create_bufs(struct file *file, void *priv, | |
3253 | struct v4l2_create_buffers *p) | |
3254 | { | |
3255 | struct video_device *vdev = video_devdata(file); | |
3256 | int res = __verify_memory_type(vdev->queue, p->memory, p->format.type); | |
3257 | ||
3258 | p->index = vdev->queue->num_buffers; | |
3259 | /* If count == 0, then just check if memory and type are valid. | |
3260 | Any -EBUSY result from __verify_memory_type can be mapped to 0. */ | |
3261 | if (p->count == 0) | |
3262 | return res != -EBUSY ? res : 0; | |
3263 | if (res) | |
3264 | return res; | |
3265 | if (vb2_queue_is_busy(vdev, file)) | |
3266 | return -EBUSY; | |
3267 | res = __create_bufs(vdev->queue, p); | |
3268 | if (res == 0) | |
3269 | vdev->queue->owner = file->private_data; | |
3270 | return res; | |
3271 | } | |
3272 | EXPORT_SYMBOL_GPL(vb2_ioctl_create_bufs); | |
3273 | ||
3274 | int vb2_ioctl_prepare_buf(struct file *file, void *priv, | |
3275 | struct v4l2_buffer *p) | |
3276 | { | |
3277 | struct video_device *vdev = video_devdata(file); | |
3278 | ||
3279 | if (vb2_queue_is_busy(vdev, file)) | |
3280 | return -EBUSY; | |
3281 | return vb2_prepare_buf(vdev->queue, p); | |
3282 | } | |
3283 | EXPORT_SYMBOL_GPL(vb2_ioctl_prepare_buf); | |
3284 | ||
3285 | int vb2_ioctl_querybuf(struct file *file, void *priv, struct v4l2_buffer *p) | |
3286 | { | |
3287 | struct video_device *vdev = video_devdata(file); | |
3288 | ||
3289 | /* No need to call vb2_queue_is_busy(), anyone can query buffers. */ | |
3290 | return vb2_querybuf(vdev->queue, p); | |
3291 | } | |
3292 | EXPORT_SYMBOL_GPL(vb2_ioctl_querybuf); | |
3293 | ||
3294 | int vb2_ioctl_qbuf(struct file *file, void *priv, struct v4l2_buffer *p) | |
3295 | { | |
3296 | struct video_device *vdev = video_devdata(file); | |
3297 | ||
3298 | if (vb2_queue_is_busy(vdev, file)) | |
3299 | return -EBUSY; | |
3300 | return vb2_qbuf(vdev->queue, p); | |
3301 | } | |
3302 | EXPORT_SYMBOL_GPL(vb2_ioctl_qbuf); | |
3303 | ||
3304 | int vb2_ioctl_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p) | |
3305 | { | |
3306 | struct video_device *vdev = video_devdata(file); | |
3307 | ||
3308 | if (vb2_queue_is_busy(vdev, file)) | |
3309 | return -EBUSY; | |
3310 | return vb2_dqbuf(vdev->queue, p, file->f_flags & O_NONBLOCK); | |
3311 | } | |
3312 | EXPORT_SYMBOL_GPL(vb2_ioctl_dqbuf); | |
3313 | ||
3314 | int vb2_ioctl_streamon(struct file *file, void *priv, enum v4l2_buf_type i) | |
3315 | { | |
3316 | struct video_device *vdev = video_devdata(file); | |
3317 | ||
3318 | if (vb2_queue_is_busy(vdev, file)) | |
3319 | return -EBUSY; | |
3320 | return vb2_streamon(vdev->queue, i); | |
3321 | } | |
3322 | EXPORT_SYMBOL_GPL(vb2_ioctl_streamon); | |
3323 | ||
3324 | int vb2_ioctl_streamoff(struct file *file, void *priv, enum v4l2_buf_type i) | |
3325 | { | |
3326 | struct video_device *vdev = video_devdata(file); | |
3327 | ||
3328 | if (vb2_queue_is_busy(vdev, file)) | |
3329 | return -EBUSY; | |
3330 | return vb2_streamoff(vdev->queue, i); | |
3331 | } | |
3332 | EXPORT_SYMBOL_GPL(vb2_ioctl_streamoff); | |
3333 | ||
83ae7c5a TS |
3334 | int vb2_ioctl_expbuf(struct file *file, void *priv, struct v4l2_exportbuffer *p) |
3335 | { | |
3336 | struct video_device *vdev = video_devdata(file); | |
3337 | ||
3338 | if (vb2_queue_is_busy(vdev, file)) | |
3339 | return -EBUSY; | |
3340 | return vb2_expbuf(vdev->queue, p); | |
3341 | } | |
3342 | EXPORT_SYMBOL_GPL(vb2_ioctl_expbuf); | |
3343 | ||
4c1ffcaa HV |
3344 | /* v4l2_file_operations helpers */ |
3345 | ||
3346 | int vb2_fop_mmap(struct file *file, struct vm_area_struct *vma) | |
3347 | { | |
3348 | struct video_device *vdev = video_devdata(file); | |
8a90f1a6 LP |
3349 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; |
3350 | int err; | |
4c1ffcaa | 3351 | |
8a90f1a6 LP |
3352 | if (lock && mutex_lock_interruptible(lock)) |
3353 | return -ERESTARTSYS; | |
3354 | err = vb2_mmap(vdev->queue, vma); | |
3355 | if (lock) | |
3356 | mutex_unlock(lock); | |
3357 | return err; | |
4c1ffcaa HV |
3358 | } |
3359 | EXPORT_SYMBOL_GPL(vb2_fop_mmap); | |
3360 | ||
1380f575 | 3361 | int _vb2_fop_release(struct file *file, struct mutex *lock) |
4c1ffcaa HV |
3362 | { |
3363 | struct video_device *vdev = video_devdata(file); | |
3364 | ||
3365 | if (file->private_data == vdev->queue->owner) { | |
1380f575 RR |
3366 | if (lock) |
3367 | mutex_lock(lock); | |
4c1ffcaa HV |
3368 | vb2_queue_release(vdev->queue); |
3369 | vdev->queue->owner = NULL; | |
1380f575 RR |
3370 | if (lock) |
3371 | mutex_unlock(lock); | |
4c1ffcaa HV |
3372 | } |
3373 | return v4l2_fh_release(file); | |
3374 | } | |
1380f575 RR |
3375 | EXPORT_SYMBOL_GPL(_vb2_fop_release); |
3376 | ||
3377 | int vb2_fop_release(struct file *file) | |
3378 | { | |
3379 | struct video_device *vdev = video_devdata(file); | |
3380 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; | |
3381 | ||
3382 | return _vb2_fop_release(file, lock); | |
3383 | } | |
4c1ffcaa HV |
3384 | EXPORT_SYMBOL_GPL(vb2_fop_release); |
3385 | ||
819585bc | 3386 | ssize_t vb2_fop_write(struct file *file, const char __user *buf, |
4c1ffcaa HV |
3387 | size_t count, loff_t *ppos) |
3388 | { | |
3389 | struct video_device *vdev = video_devdata(file); | |
3390 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; | |
4c1ffcaa HV |
3391 | int err = -EBUSY; |
3392 | ||
cf533735 | 3393 | if (lock && mutex_lock_interruptible(lock)) |
4c1ffcaa HV |
3394 | return -ERESTARTSYS; |
3395 | if (vb2_queue_is_busy(vdev, file)) | |
3396 | goto exit; | |
3397 | err = vb2_write(vdev->queue, buf, count, ppos, | |
3398 | file->f_flags & O_NONBLOCK); | |
8c82c75c | 3399 | if (vdev->queue->fileio) |
4c1ffcaa HV |
3400 | vdev->queue->owner = file->private_data; |
3401 | exit: | |
cf533735 | 3402 | if (lock) |
4c1ffcaa HV |
3403 | mutex_unlock(lock); |
3404 | return err; | |
3405 | } | |
3406 | EXPORT_SYMBOL_GPL(vb2_fop_write); | |
3407 | ||
3408 | ssize_t vb2_fop_read(struct file *file, char __user *buf, | |
3409 | size_t count, loff_t *ppos) | |
3410 | { | |
3411 | struct video_device *vdev = video_devdata(file); | |
3412 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; | |
4c1ffcaa HV |
3413 | int err = -EBUSY; |
3414 | ||
cf533735 | 3415 | if (lock && mutex_lock_interruptible(lock)) |
4c1ffcaa HV |
3416 | return -ERESTARTSYS; |
3417 | if (vb2_queue_is_busy(vdev, file)) | |
3418 | goto exit; | |
3419 | err = vb2_read(vdev->queue, buf, count, ppos, | |
3420 | file->f_flags & O_NONBLOCK); | |
8c82c75c | 3421 | if (vdev->queue->fileio) |
4c1ffcaa HV |
3422 | vdev->queue->owner = file->private_data; |
3423 | exit: | |
cf533735 | 3424 | if (lock) |
4c1ffcaa HV |
3425 | mutex_unlock(lock); |
3426 | return err; | |
3427 | } | |
3428 | EXPORT_SYMBOL_GPL(vb2_fop_read); | |
3429 | ||
3430 | unsigned int vb2_fop_poll(struct file *file, poll_table *wait) | |
3431 | { | |
3432 | struct video_device *vdev = video_devdata(file); | |
3433 | struct vb2_queue *q = vdev->queue; | |
3434 | struct mutex *lock = q->lock ? q->lock : vdev->lock; | |
3435 | unsigned long req_events = poll_requested_events(wait); | |
3436 | unsigned res; | |
3437 | void *fileio; | |
4c1ffcaa HV |
3438 | bool must_lock = false; |
3439 | ||
3440 | /* Try to be smart: only lock if polling might start fileio, | |
3441 | otherwise locking will only introduce unwanted delays. */ | |
74753cff | 3442 | if (q->num_buffers == 0 && !vb2_fileio_is_active(q)) { |
4c1ffcaa HV |
3443 | if (!V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_READ) && |
3444 | (req_events & (POLLIN | POLLRDNORM))) | |
3445 | must_lock = true; | |
3446 | else if (V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_WRITE) && | |
3447 | (req_events & (POLLOUT | POLLWRNORM))) | |
3448 | must_lock = true; | |
3449 | } | |
3450 | ||
3451 | /* If locking is needed, but this helper doesn't know how, then you | |
3452 | shouldn't be using this helper but you should write your own. */ | |
cf533735 | 3453 | WARN_ON(must_lock && !lock); |
4c1ffcaa | 3454 | |
cf533735 | 3455 | if (must_lock && lock && mutex_lock_interruptible(lock)) |
4c1ffcaa HV |
3456 | return POLLERR; |
3457 | ||
3458 | fileio = q->fileio; | |
3459 | ||
3460 | res = vb2_poll(vdev->queue, file, wait); | |
3461 | ||
3462 | /* If fileio was started, then we have a new queue owner. */ | |
3463 | if (must_lock && !fileio && q->fileio) | |
3464 | q->owner = file->private_data; | |
cf533735 | 3465 | if (must_lock && lock) |
4c1ffcaa HV |
3466 | mutex_unlock(lock); |
3467 | return res; | |
3468 | } | |
3469 | EXPORT_SYMBOL_GPL(vb2_fop_poll); | |
3470 | ||
3471 | #ifndef CONFIG_MMU | |
3472 | unsigned long vb2_fop_get_unmapped_area(struct file *file, unsigned long addr, | |
3473 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
3474 | { | |
3475 | struct video_device *vdev = video_devdata(file); | |
8a90f1a6 LP |
3476 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; |
3477 | int ret; | |
4c1ffcaa | 3478 | |
8a90f1a6 LP |
3479 | if (lock && mutex_lock_interruptible(lock)) |
3480 | return -ERESTARTSYS; | |
3481 | ret = vb2_get_unmapped_area(vdev->queue, addr, len, pgoff, flags); | |
3482 | if (lock) | |
3483 | mutex_unlock(lock); | |
3484 | return ret; | |
4c1ffcaa HV |
3485 | } |
3486 | EXPORT_SYMBOL_GPL(vb2_fop_get_unmapped_area); | |
3487 | #endif | |
3488 | ||
3489 | /* vb2_ops helpers. Only use if vq->lock is non-NULL. */ | |
3490 | ||
3491 | void vb2_ops_wait_prepare(struct vb2_queue *vq) | |
3492 | { | |
3493 | mutex_unlock(vq->lock); | |
3494 | } | |
3495 | EXPORT_SYMBOL_GPL(vb2_ops_wait_prepare); | |
3496 | ||
3497 | void vb2_ops_wait_finish(struct vb2_queue *vq) | |
3498 | { | |
3499 | mutex_lock(vq->lock); | |
3500 | } | |
3501 | EXPORT_SYMBOL_GPL(vb2_ops_wait_finish); | |
3502 | ||
e23ccc0a | 3503 | MODULE_DESCRIPTION("Driver helper framework for Video for Linux 2"); |
95072084 | 3504 | MODULE_AUTHOR("Pawel Osciak <pawel@osciak.com>, Marek Szyprowski"); |
e23ccc0a | 3505 | MODULE_LICENSE("GPL"); |