Commit | Line | Data |
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7f98639d PO |
1 | /* |
2 | * Memory-to-memory device framework for Video for Linux 2 and videobuf. | |
3 | * | |
4 | * Helper functions for devices that use videobuf buffers for both their | |
5 | * source and destination. | |
6 | * | |
7 | * Copyright (c) 2009-2010 Samsung Electronics Co., Ltd. | |
95072084 | 8 | * Pawel Osciak, <pawel@osciak.com> |
7f98639d PO |
9 | * Marek Szyprowski, <m.szyprowski@samsung.com> |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by the | |
13 | * Free Software Foundation; either version 2 of the License, or (at your | |
14 | * option) any later version. | |
15 | */ | |
16 | #include <linux/module.h> | |
17 | #include <linux/sched.h> | |
18 | #include <linux/slab.h> | |
19 | ||
c139990e | 20 | #include <media/videobuf2-v4l2.h> |
7f98639d | 21 | #include <media/v4l2-mem2mem.h> |
08eb8510 HV |
22 | #include <media/v4l2-dev.h> |
23 | #include <media/v4l2-fh.h> | |
24 | #include <media/v4l2-event.h> | |
7f98639d PO |
25 | |
26 | MODULE_DESCRIPTION("Mem to mem device framework for videobuf"); | |
95072084 | 27 | MODULE_AUTHOR("Pawel Osciak, <pawel@osciak.com>"); |
7f98639d PO |
28 | MODULE_LICENSE("GPL"); |
29 | ||
30 | static bool debug; | |
31 | module_param(debug, bool, 0644); | |
32 | ||
33 | #define dprintk(fmt, arg...) \ | |
34 | do { \ | |
35 | if (debug) \ | |
36 | printk(KERN_DEBUG "%s: " fmt, __func__, ## arg);\ | |
37 | } while (0) | |
38 | ||
39 | ||
40 | /* Instance is already queued on the job_queue */ | |
41 | #define TRANS_QUEUED (1 << 0) | |
42 | /* Instance is currently running in hardware */ | |
43 | #define TRANS_RUNNING (1 << 1) | |
2ad5389b SAB |
44 | /* Instance is currently aborting */ |
45 | #define TRANS_ABORT (1 << 2) | |
7f98639d PO |
46 | |
47 | ||
48 | /* Offset base for buffers on the destination queue - used to distinguish | |
49 | * between source and destination buffers when mmapping - they receive the same | |
50 | * offsets but for different queues */ | |
51 | #define DST_QUEUE_OFF_BASE (1 << 30) | |
52 | ||
53 | ||
54 | /** | |
55 | * struct v4l2_m2m_dev - per-device context | |
56 | * @curr_ctx: currently running instance | |
57 | * @job_queue: instances queued to run | |
58 | * @job_spinlock: protects job_queue | |
59 | * @m2m_ops: driver callbacks | |
60 | */ | |
61 | struct v4l2_m2m_dev { | |
62 | struct v4l2_m2m_ctx *curr_ctx; | |
63 | ||
64 | struct list_head job_queue; | |
65 | spinlock_t job_spinlock; | |
66 | ||
b1252eb8 | 67 | const struct v4l2_m2m_ops *m2m_ops; |
7f98639d PO |
68 | }; |
69 | ||
70 | static struct v4l2_m2m_queue_ctx *get_queue_ctx(struct v4l2_m2m_ctx *m2m_ctx, | |
71 | enum v4l2_buf_type type) | |
72 | { | |
908a0d7c | 73 | if (V4L2_TYPE_IS_OUTPUT(type)) |
7f98639d | 74 | return &m2m_ctx->out_q_ctx; |
908a0d7c MS |
75 | else |
76 | return &m2m_ctx->cap_q_ctx; | |
7f98639d PO |
77 | } |
78 | ||
79 | /** | |
908a0d7c | 80 | * v4l2_m2m_get_vq() - return vb2_queue for the given type |
7f98639d | 81 | */ |
908a0d7c | 82 | struct vb2_queue *v4l2_m2m_get_vq(struct v4l2_m2m_ctx *m2m_ctx, |
7f98639d PO |
83 | enum v4l2_buf_type type) |
84 | { | |
85 | struct v4l2_m2m_queue_ctx *q_ctx; | |
86 | ||
87 | q_ctx = get_queue_ctx(m2m_ctx, type); | |
88 | if (!q_ctx) | |
89 | return NULL; | |
90 | ||
91 | return &q_ctx->q; | |
92 | } | |
93 | EXPORT_SYMBOL(v4l2_m2m_get_vq); | |
94 | ||
95 | /** | |
96 | * v4l2_m2m_next_buf() - return next buffer from the list of ready buffers | |
97 | */ | |
908a0d7c | 98 | void *v4l2_m2m_next_buf(struct v4l2_m2m_queue_ctx *q_ctx) |
7f98639d | 99 | { |
d5451c1d | 100 | struct v4l2_m2m_buffer *b; |
7f98639d PO |
101 | unsigned long flags; |
102 | ||
908a0d7c | 103 | spin_lock_irqsave(&q_ctx->rdy_spinlock, flags); |
7f98639d | 104 | |
a6bd62be AP |
105 | if (list_empty(&q_ctx->rdy_queue)) { |
106 | spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags); | |
107 | return NULL; | |
108 | } | |
7f98639d | 109 | |
c392e9e1 | 110 | b = list_first_entry(&q_ctx->rdy_queue, struct v4l2_m2m_buffer, list); |
908a0d7c MS |
111 | spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags); |
112 | return &b->vb; | |
7f98639d PO |
113 | } |
114 | EXPORT_SYMBOL_GPL(v4l2_m2m_next_buf); | |
115 | ||
116 | /** | |
117 | * v4l2_m2m_buf_remove() - take off a buffer from the list of ready buffers and | |
118 | * return it | |
119 | */ | |
908a0d7c | 120 | void *v4l2_m2m_buf_remove(struct v4l2_m2m_queue_ctx *q_ctx) |
7f98639d | 121 | { |
d5451c1d | 122 | struct v4l2_m2m_buffer *b; |
7f98639d PO |
123 | unsigned long flags; |
124 | ||
908a0d7c | 125 | spin_lock_irqsave(&q_ctx->rdy_spinlock, flags); |
a6bd62be AP |
126 | if (list_empty(&q_ctx->rdy_queue)) { |
127 | spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags); | |
128 | return NULL; | |
7f98639d | 129 | } |
c392e9e1 | 130 | b = list_first_entry(&q_ctx->rdy_queue, struct v4l2_m2m_buffer, list); |
a6bd62be AP |
131 | list_del(&b->list); |
132 | q_ctx->num_rdy--; | |
908a0d7c | 133 | spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags); |
7f98639d | 134 | |
908a0d7c | 135 | return &b->vb; |
7f98639d PO |
136 | } |
137 | EXPORT_SYMBOL_GPL(v4l2_m2m_buf_remove); | |
138 | ||
139 | /* | |
140 | * Scheduling handlers | |
141 | */ | |
142 | ||
143 | /** | |
144 | * v4l2_m2m_get_curr_priv() - return driver private data for the currently | |
145 | * running instance or NULL if no instance is running | |
146 | */ | |
147 | void *v4l2_m2m_get_curr_priv(struct v4l2_m2m_dev *m2m_dev) | |
148 | { | |
149 | unsigned long flags; | |
150 | void *ret = NULL; | |
151 | ||
152 | spin_lock_irqsave(&m2m_dev->job_spinlock, flags); | |
153 | if (m2m_dev->curr_ctx) | |
154 | ret = m2m_dev->curr_ctx->priv; | |
155 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | |
156 | ||
157 | return ret; | |
158 | } | |
159 | EXPORT_SYMBOL(v4l2_m2m_get_curr_priv); | |
160 | ||
161 | /** | |
162 | * v4l2_m2m_try_run() - select next job to perform and run it if possible | |
163 | * | |
164 | * Get next transaction (if present) from the waiting jobs list and run it. | |
165 | */ | |
166 | static void v4l2_m2m_try_run(struct v4l2_m2m_dev *m2m_dev) | |
167 | { | |
168 | unsigned long flags; | |
169 | ||
170 | spin_lock_irqsave(&m2m_dev->job_spinlock, flags); | |
171 | if (NULL != m2m_dev->curr_ctx) { | |
172 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | |
173 | dprintk("Another instance is running, won't run now\n"); | |
174 | return; | |
175 | } | |
176 | ||
177 | if (list_empty(&m2m_dev->job_queue)) { | |
178 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | |
179 | dprintk("No job pending\n"); | |
180 | return; | |
181 | } | |
182 | ||
c392e9e1 | 183 | m2m_dev->curr_ctx = list_first_entry(&m2m_dev->job_queue, |
7f98639d PO |
184 | struct v4l2_m2m_ctx, queue); |
185 | m2m_dev->curr_ctx->job_flags |= TRANS_RUNNING; | |
186 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | |
187 | ||
188 | m2m_dev->m2m_ops->device_run(m2m_dev->curr_ctx->priv); | |
189 | } | |
190 | ||
191 | /** | |
192 | * v4l2_m2m_try_schedule() - check whether an instance is ready to be added to | |
193 | * the pending job queue and add it if so. | |
194 | * @m2m_ctx: m2m context assigned to the instance to be checked | |
195 | * | |
196 | * There are three basic requirements an instance has to meet to be able to run: | |
197 | * 1) at least one source buffer has to be queued, | |
198 | * 2) at least one destination buffer has to be queued, | |
199 | * 3) streaming has to be on. | |
200 | * | |
33bdd5a8 PZ |
201 | * If a queue is buffered (for example a decoder hardware ringbuffer that has |
202 | * to be drained before doing streamoff), allow scheduling without v4l2 buffers | |
203 | * on that queue. | |
204 | * | |
7f98639d PO |
205 | * There may also be additional, custom requirements. In such case the driver |
206 | * should supply a custom callback (job_ready in v4l2_m2m_ops) that should | |
207 | * return 1 if the instance is ready. | |
208 | * An example of the above could be an instance that requires more than one | |
209 | * src/dst buffer per transaction. | |
210 | */ | |
1190a419 | 211 | void v4l2_m2m_try_schedule(struct v4l2_m2m_ctx *m2m_ctx) |
7f98639d PO |
212 | { |
213 | struct v4l2_m2m_dev *m2m_dev; | |
b730627a | 214 | unsigned long flags_job, flags_out, flags_cap; |
7f98639d PO |
215 | |
216 | m2m_dev = m2m_ctx->m2m_dev; | |
217 | dprintk("Trying to schedule a job for m2m_ctx: %p\n", m2m_ctx); | |
218 | ||
219 | if (!m2m_ctx->out_q_ctx.q.streaming | |
220 | || !m2m_ctx->cap_q_ctx.q.streaming) { | |
221 | dprintk("Streaming needs to be on for both queues\n"); | |
222 | return; | |
223 | } | |
224 | ||
225 | spin_lock_irqsave(&m2m_dev->job_spinlock, flags_job); | |
2ad5389b SAB |
226 | |
227 | /* If the context is aborted then don't schedule it */ | |
228 | if (m2m_ctx->job_flags & TRANS_ABORT) { | |
229 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job); | |
230 | dprintk("Aborted context\n"); | |
231 | return; | |
232 | } | |
233 | ||
7f98639d PO |
234 | if (m2m_ctx->job_flags & TRANS_QUEUED) { |
235 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job); | |
236 | dprintk("On job queue already\n"); | |
237 | return; | |
238 | } | |
239 | ||
b730627a | 240 | spin_lock_irqsave(&m2m_ctx->out_q_ctx.rdy_spinlock, flags_out); |
33bdd5a8 PZ |
241 | if (list_empty(&m2m_ctx->out_q_ctx.rdy_queue) |
242 | && !m2m_ctx->out_q_ctx.buffered) { | |
b730627a JS |
243 | spin_unlock_irqrestore(&m2m_ctx->out_q_ctx.rdy_spinlock, |
244 | flags_out); | |
7f98639d PO |
245 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job); |
246 | dprintk("No input buffers available\n"); | |
247 | return; | |
248 | } | |
b730627a | 249 | spin_lock_irqsave(&m2m_ctx->cap_q_ctx.rdy_spinlock, flags_cap); |
33bdd5a8 PZ |
250 | if (list_empty(&m2m_ctx->cap_q_ctx.rdy_queue) |
251 | && !m2m_ctx->cap_q_ctx.buffered) { | |
b730627a JS |
252 | spin_unlock_irqrestore(&m2m_ctx->cap_q_ctx.rdy_spinlock, |
253 | flags_cap); | |
254 | spin_unlock_irqrestore(&m2m_ctx->out_q_ctx.rdy_spinlock, | |
255 | flags_out); | |
7f98639d PO |
256 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job); |
257 | dprintk("No output buffers available\n"); | |
258 | return; | |
259 | } | |
b730627a JS |
260 | spin_unlock_irqrestore(&m2m_ctx->cap_q_ctx.rdy_spinlock, flags_cap); |
261 | spin_unlock_irqrestore(&m2m_ctx->out_q_ctx.rdy_spinlock, flags_out); | |
7f98639d PO |
262 | |
263 | if (m2m_dev->m2m_ops->job_ready | |
264 | && (!m2m_dev->m2m_ops->job_ready(m2m_ctx->priv))) { | |
265 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job); | |
266 | dprintk("Driver not ready\n"); | |
267 | return; | |
268 | } | |
269 | ||
270 | list_add_tail(&m2m_ctx->queue, &m2m_dev->job_queue); | |
271 | m2m_ctx->job_flags |= TRANS_QUEUED; | |
272 | ||
273 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job); | |
274 | ||
275 | v4l2_m2m_try_run(m2m_dev); | |
276 | } | |
1190a419 | 277 | EXPORT_SYMBOL_GPL(v4l2_m2m_try_schedule); |
7f98639d | 278 | |
fea564a5 SAB |
279 | /** |
280 | * v4l2_m2m_cancel_job() - cancel pending jobs for the context | |
281 | * | |
282 | * In case of streamoff or release called on any context, | |
283 | * 1] If the context is currently running, then abort job will be called | |
284 | * 2] If the context is queued, then the context will be removed from | |
285 | * the job_queue | |
286 | */ | |
287 | static void v4l2_m2m_cancel_job(struct v4l2_m2m_ctx *m2m_ctx) | |
288 | { | |
289 | struct v4l2_m2m_dev *m2m_dev; | |
290 | unsigned long flags; | |
291 | ||
292 | m2m_dev = m2m_ctx->m2m_dev; | |
293 | spin_lock_irqsave(&m2m_dev->job_spinlock, flags); | |
2ad5389b SAB |
294 | |
295 | m2m_ctx->job_flags |= TRANS_ABORT; | |
fea564a5 SAB |
296 | if (m2m_ctx->job_flags & TRANS_RUNNING) { |
297 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | |
298 | m2m_dev->m2m_ops->job_abort(m2m_ctx->priv); | |
299 | dprintk("m2m_ctx %p running, will wait to complete", m2m_ctx); | |
300 | wait_event(m2m_ctx->finished, | |
301 | !(m2m_ctx->job_flags & TRANS_RUNNING)); | |
302 | } else if (m2m_ctx->job_flags & TRANS_QUEUED) { | |
303 | list_del(&m2m_ctx->queue); | |
304 | m2m_ctx->job_flags &= ~(TRANS_QUEUED | TRANS_RUNNING); | |
305 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | |
306 | dprintk("m2m_ctx: %p had been on queue and was removed\n", | |
307 | m2m_ctx); | |
308 | } else { | |
309 | /* Do nothing, was not on queue/running */ | |
310 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | |
311 | } | |
312 | } | |
313 | ||
7f98639d PO |
314 | /** |
315 | * v4l2_m2m_job_finish() - inform the framework that a job has been finished | |
316 | * and have it clean up | |
317 | * | |
318 | * Called by a driver to yield back the device after it has finished with it. | |
319 | * Should be called as soon as possible after reaching a state which allows | |
320 | * other instances to take control of the device. | |
321 | * | |
322 | * This function has to be called only after device_run() callback has been | |
323 | * called on the driver. To prevent recursion, it should not be called directly | |
324 | * from the device_run() callback though. | |
325 | */ | |
326 | void v4l2_m2m_job_finish(struct v4l2_m2m_dev *m2m_dev, | |
327 | struct v4l2_m2m_ctx *m2m_ctx) | |
328 | { | |
329 | unsigned long flags; | |
330 | ||
331 | spin_lock_irqsave(&m2m_dev->job_spinlock, flags); | |
332 | if (!m2m_dev->curr_ctx || m2m_dev->curr_ctx != m2m_ctx) { | |
333 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | |
334 | dprintk("Called by an instance not currently running\n"); | |
335 | return; | |
336 | } | |
337 | ||
338 | list_del(&m2m_dev->curr_ctx->queue); | |
339 | m2m_dev->curr_ctx->job_flags &= ~(TRANS_QUEUED | TRANS_RUNNING); | |
908a0d7c | 340 | wake_up(&m2m_dev->curr_ctx->finished); |
7f98639d PO |
341 | m2m_dev->curr_ctx = NULL; |
342 | ||
343 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | |
344 | ||
345 | /* This instance might have more buffers ready, but since we do not | |
346 | * allow more than one job on the job_queue per instance, each has | |
347 | * to be scheduled separately after the previous one finishes. */ | |
348 | v4l2_m2m_try_schedule(m2m_ctx); | |
349 | v4l2_m2m_try_run(m2m_dev); | |
350 | } | |
351 | EXPORT_SYMBOL(v4l2_m2m_job_finish); | |
352 | ||
353 | /** | |
354 | * v4l2_m2m_reqbufs() - multi-queue-aware REQBUFS multiplexer | |
355 | */ | |
356 | int v4l2_m2m_reqbufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | |
357 | struct v4l2_requestbuffers *reqbufs) | |
358 | { | |
908a0d7c | 359 | struct vb2_queue *vq; |
c13a5ccf | 360 | int ret; |
7f98639d PO |
361 | |
362 | vq = v4l2_m2m_get_vq(m2m_ctx, reqbufs->type); | |
c13a5ccf PZ |
363 | ret = vb2_reqbufs(vq, reqbufs); |
364 | /* If count == 0, then the owner has released all buffers and he | |
365 | is no longer owner of the queue. Otherwise we have an owner. */ | |
366 | if (ret == 0) | |
367 | vq->owner = reqbufs->count ? file->private_data : NULL; | |
368 | ||
369 | return ret; | |
7f98639d PO |
370 | } |
371 | EXPORT_SYMBOL_GPL(v4l2_m2m_reqbufs); | |
372 | ||
373 | /** | |
374 | * v4l2_m2m_querybuf() - multi-queue-aware QUERYBUF multiplexer | |
375 | * | |
376 | * See v4l2_m2m_mmap() documentation for details. | |
377 | */ | |
378 | int v4l2_m2m_querybuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | |
379 | struct v4l2_buffer *buf) | |
380 | { | |
908a0d7c MS |
381 | struct vb2_queue *vq; |
382 | int ret = 0; | |
383 | unsigned int i; | |
7f98639d PO |
384 | |
385 | vq = v4l2_m2m_get_vq(m2m_ctx, buf->type); | |
908a0d7c MS |
386 | ret = vb2_querybuf(vq, buf); |
387 | ||
388 | /* Adjust MMAP memory offsets for the CAPTURE queue */ | |
389 | if (buf->memory == V4L2_MEMORY_MMAP && !V4L2_TYPE_IS_OUTPUT(vq->type)) { | |
390 | if (V4L2_TYPE_IS_MULTIPLANAR(vq->type)) { | |
391 | for (i = 0; i < buf->length; ++i) | |
392 | buf->m.planes[i].m.mem_offset | |
393 | += DST_QUEUE_OFF_BASE; | |
394 | } else { | |
395 | buf->m.offset += DST_QUEUE_OFF_BASE; | |
396 | } | |
7f98639d PO |
397 | } |
398 | ||
399 | return ret; | |
400 | } | |
401 | EXPORT_SYMBOL_GPL(v4l2_m2m_querybuf); | |
402 | ||
403 | /** | |
404 | * v4l2_m2m_qbuf() - enqueue a source or destination buffer, depending on | |
405 | * the type | |
406 | */ | |
407 | int v4l2_m2m_qbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | |
408 | struct v4l2_buffer *buf) | |
409 | { | |
908a0d7c | 410 | struct vb2_queue *vq; |
7f98639d PO |
411 | int ret; |
412 | ||
413 | vq = v4l2_m2m_get_vq(m2m_ctx, buf->type); | |
908a0d7c | 414 | ret = vb2_qbuf(vq, buf); |
7f98639d PO |
415 | if (!ret) |
416 | v4l2_m2m_try_schedule(m2m_ctx); | |
417 | ||
418 | return ret; | |
419 | } | |
420 | EXPORT_SYMBOL_GPL(v4l2_m2m_qbuf); | |
421 | ||
422 | /** | |
423 | * v4l2_m2m_dqbuf() - dequeue a source or destination buffer, depending on | |
424 | * the type | |
425 | */ | |
426 | int v4l2_m2m_dqbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | |
427 | struct v4l2_buffer *buf) | |
428 | { | |
908a0d7c | 429 | struct vb2_queue *vq; |
7f98639d PO |
430 | |
431 | vq = v4l2_m2m_get_vq(m2m_ctx, buf->type); | |
908a0d7c | 432 | return vb2_dqbuf(vq, buf, file->f_flags & O_NONBLOCK); |
7f98639d PO |
433 | } |
434 | EXPORT_SYMBOL_GPL(v4l2_m2m_dqbuf); | |
435 | ||
e68cf471 HV |
436 | /** |
437 | * v4l2_m2m_prepare_buf() - prepare a source or destination buffer, depending on | |
438 | * the type | |
439 | */ | |
440 | int v4l2_m2m_prepare_buf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | |
441 | struct v4l2_buffer *buf) | |
442 | { | |
443 | struct vb2_queue *vq; | |
444 | int ret; | |
445 | ||
446 | vq = v4l2_m2m_get_vq(m2m_ctx, buf->type); | |
447 | ret = vb2_prepare_buf(vq, buf); | |
448 | if (!ret) | |
449 | v4l2_m2m_try_schedule(m2m_ctx); | |
450 | ||
451 | return ret; | |
452 | } | |
453 | EXPORT_SYMBOL_GPL(v4l2_m2m_prepare_buf); | |
454 | ||
8b94ca61 PZ |
455 | /** |
456 | * v4l2_m2m_create_bufs() - create a source or destination buffer, depending | |
457 | * on the type | |
458 | */ | |
459 | int v4l2_m2m_create_bufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | |
460 | struct v4l2_create_buffers *create) | |
461 | { | |
462 | struct vb2_queue *vq; | |
463 | ||
464 | vq = v4l2_m2m_get_vq(m2m_ctx, create->format.type); | |
465 | return vb2_create_bufs(vq, create); | |
466 | } | |
467 | EXPORT_SYMBOL_GPL(v4l2_m2m_create_bufs); | |
468 | ||
83ae7c5a TS |
469 | /** |
470 | * v4l2_m2m_expbuf() - export a source or destination buffer, depending on | |
471 | * the type | |
472 | */ | |
473 | int v4l2_m2m_expbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | |
474 | struct v4l2_exportbuffer *eb) | |
475 | { | |
476 | struct vb2_queue *vq; | |
477 | ||
478 | vq = v4l2_m2m_get_vq(m2m_ctx, eb->type); | |
479 | return vb2_expbuf(vq, eb); | |
480 | } | |
481 | EXPORT_SYMBOL_GPL(v4l2_m2m_expbuf); | |
7f98639d PO |
482 | /** |
483 | * v4l2_m2m_streamon() - turn on streaming for a video queue | |
484 | */ | |
485 | int v4l2_m2m_streamon(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | |
486 | enum v4l2_buf_type type) | |
487 | { | |
908a0d7c | 488 | struct vb2_queue *vq; |
7f98639d PO |
489 | int ret; |
490 | ||
491 | vq = v4l2_m2m_get_vq(m2m_ctx, type); | |
908a0d7c | 492 | ret = vb2_streamon(vq, type); |
7f98639d PO |
493 | if (!ret) |
494 | v4l2_m2m_try_schedule(m2m_ctx); | |
495 | ||
496 | return ret; | |
497 | } | |
498 | EXPORT_SYMBOL_GPL(v4l2_m2m_streamon); | |
499 | ||
500 | /** | |
501 | * v4l2_m2m_streamoff() - turn off streaming for a video queue | |
502 | */ | |
503 | int v4l2_m2m_streamoff(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | |
504 | enum v4l2_buf_type type) | |
505 | { | |
401f6a27 JS |
506 | struct v4l2_m2m_dev *m2m_dev; |
507 | struct v4l2_m2m_queue_ctx *q_ctx; | |
508 | unsigned long flags_job, flags; | |
509 | int ret; | |
7f98639d | 510 | |
fea564a5 SAB |
511 | /* wait until the current context is dequeued from job_queue */ |
512 | v4l2_m2m_cancel_job(m2m_ctx); | |
513 | ||
401f6a27 JS |
514 | q_ctx = get_queue_ctx(m2m_ctx, type); |
515 | ret = vb2_streamoff(&q_ctx->q, type); | |
516 | if (ret) | |
517 | return ret; | |
518 | ||
519 | m2m_dev = m2m_ctx->m2m_dev; | |
520 | spin_lock_irqsave(&m2m_dev->job_spinlock, flags_job); | |
521 | /* We should not be scheduled anymore, since we're dropping a queue. */ | |
d7bb0ce8 PZ |
522 | if (m2m_ctx->job_flags & TRANS_QUEUED) |
523 | list_del(&m2m_ctx->queue); | |
401f6a27 JS |
524 | m2m_ctx->job_flags = 0; |
525 | ||
526 | spin_lock_irqsave(&q_ctx->rdy_spinlock, flags); | |
527 | /* Drop queue, since streamoff returns device to the same state as after | |
528 | * calling reqbufs. */ | |
529 | INIT_LIST_HEAD(&q_ctx->rdy_queue); | |
84e68098 | 530 | q_ctx->num_rdy = 0; |
401f6a27 JS |
531 | spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags); |
532 | ||
533 | if (m2m_dev->curr_ctx == m2m_ctx) { | |
534 | m2m_dev->curr_ctx = NULL; | |
535 | wake_up(&m2m_ctx->finished); | |
536 | } | |
537 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job); | |
538 | ||
539 | return 0; | |
7f98639d PO |
540 | } |
541 | EXPORT_SYMBOL_GPL(v4l2_m2m_streamoff); | |
542 | ||
543 | /** | |
544 | * v4l2_m2m_poll() - poll replacement, for destination buffers only | |
545 | * | |
546 | * Call from the driver's poll() function. Will poll both queues. If a buffer | |
547 | * is available to dequeue (with dqbuf) from the source queue, this will | |
548 | * indicate that a non-blocking write can be performed, while read will be | |
549 | * returned in case of the destination queue. | |
550 | */ | |
551 | unsigned int v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | |
552 | struct poll_table_struct *wait) | |
553 | { | |
08eb8510 HV |
554 | struct video_device *vfd = video_devdata(file); |
555 | unsigned long req_events = poll_requested_events(wait); | |
908a0d7c MS |
556 | struct vb2_queue *src_q, *dst_q; |
557 | struct vb2_buffer *src_vb = NULL, *dst_vb = NULL; | |
7f98639d | 558 | unsigned int rc = 0; |
908a0d7c | 559 | unsigned long flags; |
7f98639d | 560 | |
08eb8510 HV |
561 | if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) { |
562 | struct v4l2_fh *fh = file->private_data; | |
563 | ||
564 | if (v4l2_event_pending(fh)) | |
565 | rc = POLLPRI; | |
566 | else if (req_events & POLLPRI) | |
567 | poll_wait(file, &fh->wait, wait); | |
568 | if (!(req_events & (POLLOUT | POLLWRNORM | POLLIN | POLLRDNORM))) | |
569 | return rc; | |
570 | } | |
571 | ||
7f98639d PO |
572 | src_q = v4l2_m2m_get_src_vq(m2m_ctx); |
573 | dst_q = v4l2_m2m_get_dst_vq(m2m_ctx); | |
574 | ||
908a0d7c MS |
575 | /* |
576 | * There has to be at least one buffer queued on each queued_list, which | |
577 | * means either in driver already or waiting for driver to claim it | |
578 | * and start processing. | |
579 | */ | |
580 | if ((!src_q->streaming || list_empty(&src_q->queued_list)) | |
581 | && (!dst_q->streaming || list_empty(&dst_q->queued_list))) { | |
08eb8510 | 582 | rc |= POLLERR; |
7f98639d PO |
583 | goto end; |
584 | } | |
585 | ||
f1a81afc | 586 | spin_lock_irqsave(&src_q->done_lock, flags); |
57183467 SWK |
587 | if (list_empty(&src_q->done_list)) |
588 | poll_wait(file, &src_q->done_wq, wait); | |
f1a81afc ZD |
589 | spin_unlock_irqrestore(&src_q->done_lock, flags); |
590 | ||
591 | spin_lock_irqsave(&dst_q->done_lock, flags); | |
c1621840 PZ |
592 | if (list_empty(&dst_q->done_list)) { |
593 | /* | |
594 | * If the last buffer was dequeued from the capture queue, | |
595 | * return immediately. DQBUF will return -EPIPE. | |
596 | */ | |
f1a81afc ZD |
597 | if (dst_q->last_buffer_dequeued) { |
598 | spin_unlock_irqrestore(&dst_q->done_lock, flags); | |
c1621840 | 599 | return rc | POLLIN | POLLRDNORM; |
f1a81afc | 600 | } |
c1621840 | 601 | |
57183467 | 602 | poll_wait(file, &dst_q->done_wq, wait); |
c1621840 | 603 | } |
f1a81afc | 604 | spin_unlock_irqrestore(&dst_q->done_lock, flags); |
908a0d7c MS |
605 | |
606 | spin_lock_irqsave(&src_q->done_lock, flags); | |
607 | if (!list_empty(&src_q->done_list)) | |
608 | src_vb = list_first_entry(&src_q->done_list, struct vb2_buffer, | |
609 | done_entry); | |
610 | if (src_vb && (src_vb->state == VB2_BUF_STATE_DONE | |
611 | || src_vb->state == VB2_BUF_STATE_ERROR)) | |
612 | rc |= POLLOUT | POLLWRNORM; | |
613 | spin_unlock_irqrestore(&src_q->done_lock, flags); | |
614 | ||
615 | spin_lock_irqsave(&dst_q->done_lock, flags); | |
616 | if (!list_empty(&dst_q->done_list)) | |
617 | dst_vb = list_first_entry(&dst_q->done_list, struct vb2_buffer, | |
618 | done_entry); | |
619 | if (dst_vb && (dst_vb->state == VB2_BUF_STATE_DONE | |
620 | || dst_vb->state == VB2_BUF_STATE_ERROR)) | |
621 | rc |= POLLIN | POLLRDNORM; | |
622 | spin_unlock_irqrestore(&dst_q->done_lock, flags); | |
7f98639d PO |
623 | |
624 | end: | |
7f98639d PO |
625 | return rc; |
626 | } | |
627 | EXPORT_SYMBOL_GPL(v4l2_m2m_poll); | |
628 | ||
629 | /** | |
630 | * v4l2_m2m_mmap() - source and destination queues-aware mmap multiplexer | |
631 | * | |
632 | * Call from driver's mmap() function. Will handle mmap() for both queues | |
633 | * seamlessly for videobuffer, which will receive normal per-queue offsets and | |
634 | * proper videobuf queue pointers. The differentiation is made outside videobuf | |
635 | * by adding a predefined offset to buffers from one of the queues and | |
636 | * subtracting it before passing it back to videobuf. Only drivers (and | |
637 | * thus applications) receive modified offsets. | |
638 | */ | |
639 | int v4l2_m2m_mmap(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | |
640 | struct vm_area_struct *vma) | |
641 | { | |
642 | unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; | |
908a0d7c | 643 | struct vb2_queue *vq; |
7f98639d PO |
644 | |
645 | if (offset < DST_QUEUE_OFF_BASE) { | |
646 | vq = v4l2_m2m_get_src_vq(m2m_ctx); | |
647 | } else { | |
648 | vq = v4l2_m2m_get_dst_vq(m2m_ctx); | |
649 | vma->vm_pgoff -= (DST_QUEUE_OFF_BASE >> PAGE_SHIFT); | |
650 | } | |
651 | ||
908a0d7c | 652 | return vb2_mmap(vq, vma); |
7f98639d PO |
653 | } |
654 | EXPORT_SYMBOL(v4l2_m2m_mmap); | |
655 | ||
656 | /** | |
657 | * v4l2_m2m_init() - initialize per-driver m2m data | |
658 | * | |
659 | * Usually called from driver's probe() function. | |
660 | */ | |
b1252eb8 | 661 | struct v4l2_m2m_dev *v4l2_m2m_init(const struct v4l2_m2m_ops *m2m_ops) |
7f98639d PO |
662 | { |
663 | struct v4l2_m2m_dev *m2m_dev; | |
664 | ||
3fac4eb3 NT |
665 | if (!m2m_ops || WARN_ON(!m2m_ops->device_run) || |
666 | WARN_ON(!m2m_ops->job_abort)) | |
7f98639d PO |
667 | return ERR_PTR(-EINVAL); |
668 | ||
7f98639d PO |
669 | m2m_dev = kzalloc(sizeof *m2m_dev, GFP_KERNEL); |
670 | if (!m2m_dev) | |
671 | return ERR_PTR(-ENOMEM); | |
672 | ||
673 | m2m_dev->curr_ctx = NULL; | |
674 | m2m_dev->m2m_ops = m2m_ops; | |
675 | INIT_LIST_HEAD(&m2m_dev->job_queue); | |
676 | spin_lock_init(&m2m_dev->job_spinlock); | |
677 | ||
678 | return m2m_dev; | |
679 | } | |
680 | EXPORT_SYMBOL_GPL(v4l2_m2m_init); | |
681 | ||
682 | /** | |
683 | * v4l2_m2m_release() - cleans up and frees a m2m_dev structure | |
684 | * | |
685 | * Usually called from driver's remove() function. | |
686 | */ | |
687 | void v4l2_m2m_release(struct v4l2_m2m_dev *m2m_dev) | |
688 | { | |
689 | kfree(m2m_dev); | |
690 | } | |
691 | EXPORT_SYMBOL_GPL(v4l2_m2m_release); | |
692 | ||
693 | /** | |
694 | * v4l2_m2m_ctx_init() - allocate and initialize a m2m context | |
695 | * @priv - driver's instance private data | |
696 | * @m2m_dev - a previously initialized m2m_dev struct | |
697 | * @vq_init - a callback for queue type-specific initialization function to be | |
698 | * used for initializing videobuf_queues | |
699 | * | |
700 | * Usually called from driver's open() function. | |
701 | */ | |
908a0d7c MS |
702 | struct v4l2_m2m_ctx *v4l2_m2m_ctx_init(struct v4l2_m2m_dev *m2m_dev, |
703 | void *drv_priv, | |
704 | int (*queue_init)(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq)) | |
7f98639d PO |
705 | { |
706 | struct v4l2_m2m_ctx *m2m_ctx; | |
707 | struct v4l2_m2m_queue_ctx *out_q_ctx, *cap_q_ctx; | |
908a0d7c | 708 | int ret; |
7f98639d PO |
709 | |
710 | m2m_ctx = kzalloc(sizeof *m2m_ctx, GFP_KERNEL); | |
711 | if (!m2m_ctx) | |
712 | return ERR_PTR(-ENOMEM); | |
713 | ||
908a0d7c | 714 | m2m_ctx->priv = drv_priv; |
7f98639d | 715 | m2m_ctx->m2m_dev = m2m_dev; |
908a0d7c | 716 | init_waitqueue_head(&m2m_ctx->finished); |
7f98639d | 717 | |
908a0d7c MS |
718 | out_q_ctx = &m2m_ctx->out_q_ctx; |
719 | cap_q_ctx = &m2m_ctx->cap_q_ctx; | |
7f98639d PO |
720 | |
721 | INIT_LIST_HEAD(&out_q_ctx->rdy_queue); | |
722 | INIT_LIST_HEAD(&cap_q_ctx->rdy_queue); | |
908a0d7c MS |
723 | spin_lock_init(&out_q_ctx->rdy_spinlock); |
724 | spin_lock_init(&cap_q_ctx->rdy_spinlock); | |
7f98639d PO |
725 | |
726 | INIT_LIST_HEAD(&m2m_ctx->queue); | |
727 | ||
908a0d7c MS |
728 | ret = queue_init(drv_priv, &out_q_ctx->q, &cap_q_ctx->q); |
729 | ||
730 | if (ret) | |
731 | goto err; | |
8e6e8f93 SN |
732 | /* |
733 | * If both queues use same mutex assign it as the common buffer | |
734 | * queues lock to the m2m context. This lock is used in the | |
735 | * v4l2_m2m_ioctl_* helpers. | |
736 | */ | |
737 | if (out_q_ctx->q.lock == cap_q_ctx->q.lock) | |
738 | m2m_ctx->q_lock = out_q_ctx->q.lock; | |
7f98639d PO |
739 | |
740 | return m2m_ctx; | |
908a0d7c MS |
741 | err: |
742 | kfree(m2m_ctx); | |
743 | return ERR_PTR(ret); | |
7f98639d PO |
744 | } |
745 | EXPORT_SYMBOL_GPL(v4l2_m2m_ctx_init); | |
746 | ||
747 | /** | |
748 | * v4l2_m2m_ctx_release() - release m2m context | |
749 | * | |
750 | * Usually called from driver's release() function. | |
751 | */ | |
752 | void v4l2_m2m_ctx_release(struct v4l2_m2m_ctx *m2m_ctx) | |
753 | { | |
fea564a5 SAB |
754 | /* wait until the current context is dequeued from job_queue */ |
755 | v4l2_m2m_cancel_job(m2m_ctx); | |
7f98639d | 756 | |
908a0d7c MS |
757 | vb2_queue_release(&m2m_ctx->cap_q_ctx.q); |
758 | vb2_queue_release(&m2m_ctx->out_q_ctx.q); | |
7f98639d PO |
759 | |
760 | kfree(m2m_ctx); | |
761 | } | |
762 | EXPORT_SYMBOL_GPL(v4l2_m2m_ctx_release); | |
763 | ||
764 | /** | |
765 | * v4l2_m2m_buf_queue() - add a buffer to the proper ready buffers list. | |
766 | * | |
767 | * Call from buf_queue(), videobuf_queue_ops callback. | |
7f98639d | 768 | */ |
2d700715 JS |
769 | void v4l2_m2m_buf_queue(struct v4l2_m2m_ctx *m2m_ctx, |
770 | struct vb2_v4l2_buffer *vbuf) | |
7f98639d | 771 | { |
2d700715 JS |
772 | struct v4l2_m2m_buffer *b = container_of(vbuf, |
773 | struct v4l2_m2m_buffer, vb); | |
7f98639d | 774 | struct v4l2_m2m_queue_ctx *q_ctx; |
908a0d7c | 775 | unsigned long flags; |
7f98639d | 776 | |
2d700715 | 777 | q_ctx = get_queue_ctx(m2m_ctx, vbuf->vb2_buf.vb2_queue->type); |
7f98639d PO |
778 | if (!q_ctx) |
779 | return; | |
780 | ||
908a0d7c MS |
781 | spin_lock_irqsave(&q_ctx->rdy_spinlock, flags); |
782 | list_add_tail(&b->list, &q_ctx->rdy_queue); | |
7f98639d | 783 | q_ctx->num_rdy++; |
908a0d7c | 784 | spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags); |
7f98639d PO |
785 | } |
786 | EXPORT_SYMBOL_GPL(v4l2_m2m_buf_queue); | |
787 | ||
8e6e8f93 SN |
788 | /* Videobuf2 ioctl helpers */ |
789 | ||
790 | int v4l2_m2m_ioctl_reqbufs(struct file *file, void *priv, | |
791 | struct v4l2_requestbuffers *rb) | |
792 | { | |
793 | struct v4l2_fh *fh = file->private_data; | |
794 | ||
795 | return v4l2_m2m_reqbufs(file, fh->m2m_ctx, rb); | |
796 | } | |
797 | EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_reqbufs); | |
798 | ||
799 | int v4l2_m2m_ioctl_create_bufs(struct file *file, void *priv, | |
800 | struct v4l2_create_buffers *create) | |
801 | { | |
802 | struct v4l2_fh *fh = file->private_data; | |
803 | ||
804 | return v4l2_m2m_create_bufs(file, fh->m2m_ctx, create); | |
805 | } | |
806 | EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_create_bufs); | |
807 | ||
808 | int v4l2_m2m_ioctl_querybuf(struct file *file, void *priv, | |
809 | struct v4l2_buffer *buf) | |
810 | { | |
811 | struct v4l2_fh *fh = file->private_data; | |
812 | ||
813 | return v4l2_m2m_querybuf(file, fh->m2m_ctx, buf); | |
814 | } | |
815 | EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_querybuf); | |
816 | ||
817 | int v4l2_m2m_ioctl_qbuf(struct file *file, void *priv, | |
818 | struct v4l2_buffer *buf) | |
819 | { | |
820 | struct v4l2_fh *fh = file->private_data; | |
821 | ||
822 | return v4l2_m2m_qbuf(file, fh->m2m_ctx, buf); | |
823 | } | |
824 | EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_qbuf); | |
825 | ||
826 | int v4l2_m2m_ioctl_dqbuf(struct file *file, void *priv, | |
827 | struct v4l2_buffer *buf) | |
828 | { | |
829 | struct v4l2_fh *fh = file->private_data; | |
830 | ||
831 | return v4l2_m2m_dqbuf(file, fh->m2m_ctx, buf); | |
832 | } | |
833 | EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_dqbuf); | |
834 | ||
e68cf471 HV |
835 | int v4l2_m2m_ioctl_prepare_buf(struct file *file, void *priv, |
836 | struct v4l2_buffer *buf) | |
837 | { | |
838 | struct v4l2_fh *fh = file->private_data; | |
839 | ||
840 | return v4l2_m2m_prepare_buf(file, fh->m2m_ctx, buf); | |
841 | } | |
842 | EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_prepare_buf); | |
843 | ||
8e6e8f93 SN |
844 | int v4l2_m2m_ioctl_expbuf(struct file *file, void *priv, |
845 | struct v4l2_exportbuffer *eb) | |
846 | { | |
847 | struct v4l2_fh *fh = file->private_data; | |
848 | ||
849 | return v4l2_m2m_expbuf(file, fh->m2m_ctx, eb); | |
850 | } | |
851 | EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_expbuf); | |
852 | ||
853 | int v4l2_m2m_ioctl_streamon(struct file *file, void *priv, | |
854 | enum v4l2_buf_type type) | |
855 | { | |
856 | struct v4l2_fh *fh = file->private_data; | |
857 | ||
858 | return v4l2_m2m_streamon(file, fh->m2m_ctx, type); | |
859 | } | |
860 | EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_streamon); | |
861 | ||
862 | int v4l2_m2m_ioctl_streamoff(struct file *file, void *priv, | |
863 | enum v4l2_buf_type type) | |
864 | { | |
865 | struct v4l2_fh *fh = file->private_data; | |
866 | ||
867 | return v4l2_m2m_streamoff(file, fh->m2m_ctx, type); | |
868 | } | |
869 | EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_streamoff); | |
870 | ||
871 | /* | |
872 | * v4l2_file_operations helpers. It is assumed here same lock is used | |
873 | * for the output and the capture buffer queue. | |
874 | */ | |
875 | ||
876 | int v4l2_m2m_fop_mmap(struct file *file, struct vm_area_struct *vma) | |
877 | { | |
878 | struct v4l2_fh *fh = file->private_data; | |
8e6e8f93 | 879 | |
e752577e | 880 | return v4l2_m2m_mmap(file, fh->m2m_ctx, vma); |
8e6e8f93 SN |
881 | } |
882 | EXPORT_SYMBOL_GPL(v4l2_m2m_fop_mmap); | |
883 | ||
884 | unsigned int v4l2_m2m_fop_poll(struct file *file, poll_table *wait) | |
885 | { | |
886 | struct v4l2_fh *fh = file->private_data; | |
887 | struct v4l2_m2m_ctx *m2m_ctx = fh->m2m_ctx; | |
888 | unsigned int ret; | |
889 | ||
890 | if (m2m_ctx->q_lock) | |
891 | mutex_lock(m2m_ctx->q_lock); | |
892 | ||
893 | ret = v4l2_m2m_poll(file, m2m_ctx, wait); | |
894 | ||
895 | if (m2m_ctx->q_lock) | |
896 | mutex_unlock(m2m_ctx->q_lock); | |
897 | ||
898 | return ret; | |
899 | } | |
900 | EXPORT_SYMBOL_GPL(v4l2_m2m_fop_poll); | |
901 |