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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 | ||
908a0d7c | 20 | #include <media/videobuf2-core.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 | { |
908a0d7c | 100 | struct v4l2_m2m_buffer *b = NULL; |
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 | { |
908a0d7c | 122 | struct v4l2_m2m_buffer *b = NULL; |
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 | */ | |
211 | static void v4l2_m2m_try_schedule(struct v4l2_m2m_ctx *m2m_ctx) | |
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 | } | |
277 | ||
fea564a5 SAB |
278 | /** |
279 | * v4l2_m2m_cancel_job() - cancel pending jobs for the context | |
280 | * | |
281 | * In case of streamoff or release called on any context, | |
282 | * 1] If the context is currently running, then abort job will be called | |
283 | * 2] If the context is queued, then the context will be removed from | |
284 | * the job_queue | |
285 | */ | |
286 | static void v4l2_m2m_cancel_job(struct v4l2_m2m_ctx *m2m_ctx) | |
287 | { | |
288 | struct v4l2_m2m_dev *m2m_dev; | |
289 | unsigned long flags; | |
290 | ||
291 | m2m_dev = m2m_ctx->m2m_dev; | |
292 | spin_lock_irqsave(&m2m_dev->job_spinlock, flags); | |
2ad5389b SAB |
293 | |
294 | m2m_ctx->job_flags |= TRANS_ABORT; | |
fea564a5 SAB |
295 | if (m2m_ctx->job_flags & TRANS_RUNNING) { |
296 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | |
297 | m2m_dev->m2m_ops->job_abort(m2m_ctx->priv); | |
298 | dprintk("m2m_ctx %p running, will wait to complete", m2m_ctx); | |
299 | wait_event(m2m_ctx->finished, | |
300 | !(m2m_ctx->job_flags & TRANS_RUNNING)); | |
301 | } else if (m2m_ctx->job_flags & TRANS_QUEUED) { | |
302 | list_del(&m2m_ctx->queue); | |
303 | m2m_ctx->job_flags &= ~(TRANS_QUEUED | TRANS_RUNNING); | |
304 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | |
305 | dprintk("m2m_ctx: %p had been on queue and was removed\n", | |
306 | m2m_ctx); | |
307 | } else { | |
308 | /* Do nothing, was not on queue/running */ | |
309 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | |
310 | } | |
311 | } | |
312 | ||
7f98639d PO |
313 | /** |
314 | * v4l2_m2m_job_finish() - inform the framework that a job has been finished | |
315 | * and have it clean up | |
316 | * | |
317 | * Called by a driver to yield back the device after it has finished with it. | |
318 | * Should be called as soon as possible after reaching a state which allows | |
319 | * other instances to take control of the device. | |
320 | * | |
321 | * This function has to be called only after device_run() callback has been | |
322 | * called on the driver. To prevent recursion, it should not be called directly | |
323 | * from the device_run() callback though. | |
324 | */ | |
325 | void v4l2_m2m_job_finish(struct v4l2_m2m_dev *m2m_dev, | |
326 | struct v4l2_m2m_ctx *m2m_ctx) | |
327 | { | |
328 | unsigned long flags; | |
329 | ||
330 | spin_lock_irqsave(&m2m_dev->job_spinlock, flags); | |
331 | if (!m2m_dev->curr_ctx || m2m_dev->curr_ctx != m2m_ctx) { | |
332 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | |
333 | dprintk("Called by an instance not currently running\n"); | |
334 | return; | |
335 | } | |
336 | ||
337 | list_del(&m2m_dev->curr_ctx->queue); | |
338 | m2m_dev->curr_ctx->job_flags &= ~(TRANS_QUEUED | TRANS_RUNNING); | |
908a0d7c | 339 | wake_up(&m2m_dev->curr_ctx->finished); |
7f98639d PO |
340 | m2m_dev->curr_ctx = NULL; |
341 | ||
342 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | |
343 | ||
344 | /* This instance might have more buffers ready, but since we do not | |
345 | * allow more than one job on the job_queue per instance, each has | |
346 | * to be scheduled separately after the previous one finishes. */ | |
347 | v4l2_m2m_try_schedule(m2m_ctx); | |
348 | v4l2_m2m_try_run(m2m_dev); | |
349 | } | |
350 | EXPORT_SYMBOL(v4l2_m2m_job_finish); | |
351 | ||
352 | /** | |
353 | * v4l2_m2m_reqbufs() - multi-queue-aware REQBUFS multiplexer | |
354 | */ | |
355 | int v4l2_m2m_reqbufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | |
356 | struct v4l2_requestbuffers *reqbufs) | |
357 | { | |
908a0d7c | 358 | struct vb2_queue *vq; |
7f98639d PO |
359 | |
360 | vq = v4l2_m2m_get_vq(m2m_ctx, reqbufs->type); | |
908a0d7c | 361 | return vb2_reqbufs(vq, reqbufs); |
7f98639d PO |
362 | } |
363 | EXPORT_SYMBOL_GPL(v4l2_m2m_reqbufs); | |
364 | ||
365 | /** | |
366 | * v4l2_m2m_querybuf() - multi-queue-aware QUERYBUF multiplexer | |
367 | * | |
368 | * See v4l2_m2m_mmap() documentation for details. | |
369 | */ | |
370 | int v4l2_m2m_querybuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | |
371 | struct v4l2_buffer *buf) | |
372 | { | |
908a0d7c MS |
373 | struct vb2_queue *vq; |
374 | int ret = 0; | |
375 | unsigned int i; | |
7f98639d PO |
376 | |
377 | vq = v4l2_m2m_get_vq(m2m_ctx, buf->type); | |
908a0d7c MS |
378 | ret = vb2_querybuf(vq, buf); |
379 | ||
380 | /* Adjust MMAP memory offsets for the CAPTURE queue */ | |
381 | if (buf->memory == V4L2_MEMORY_MMAP && !V4L2_TYPE_IS_OUTPUT(vq->type)) { | |
382 | if (V4L2_TYPE_IS_MULTIPLANAR(vq->type)) { | |
383 | for (i = 0; i < buf->length; ++i) | |
384 | buf->m.planes[i].m.mem_offset | |
385 | += DST_QUEUE_OFF_BASE; | |
386 | } else { | |
387 | buf->m.offset += DST_QUEUE_OFF_BASE; | |
388 | } | |
7f98639d PO |
389 | } |
390 | ||
391 | return ret; | |
392 | } | |
393 | EXPORT_SYMBOL_GPL(v4l2_m2m_querybuf); | |
394 | ||
395 | /** | |
396 | * v4l2_m2m_qbuf() - enqueue a source or destination buffer, depending on | |
397 | * the type | |
398 | */ | |
399 | int v4l2_m2m_qbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | |
400 | struct v4l2_buffer *buf) | |
401 | { | |
908a0d7c | 402 | struct vb2_queue *vq; |
7f98639d PO |
403 | int ret; |
404 | ||
405 | vq = v4l2_m2m_get_vq(m2m_ctx, buf->type); | |
908a0d7c | 406 | ret = vb2_qbuf(vq, buf); |
7f98639d PO |
407 | if (!ret) |
408 | v4l2_m2m_try_schedule(m2m_ctx); | |
409 | ||
410 | return ret; | |
411 | } | |
412 | EXPORT_SYMBOL_GPL(v4l2_m2m_qbuf); | |
413 | ||
414 | /** | |
415 | * v4l2_m2m_dqbuf() - dequeue a source or destination buffer, depending on | |
416 | * the type | |
417 | */ | |
418 | int v4l2_m2m_dqbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | |
419 | struct v4l2_buffer *buf) | |
420 | { | |
908a0d7c | 421 | struct vb2_queue *vq; |
7f98639d PO |
422 | |
423 | vq = v4l2_m2m_get_vq(m2m_ctx, buf->type); | |
908a0d7c | 424 | return vb2_dqbuf(vq, buf, file->f_flags & O_NONBLOCK); |
7f98639d PO |
425 | } |
426 | EXPORT_SYMBOL_GPL(v4l2_m2m_dqbuf); | |
427 | ||
8b94ca61 PZ |
428 | /** |
429 | * v4l2_m2m_create_bufs() - create a source or destination buffer, depending | |
430 | * on the type | |
431 | */ | |
432 | int v4l2_m2m_create_bufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | |
433 | struct v4l2_create_buffers *create) | |
434 | { | |
435 | struct vb2_queue *vq; | |
436 | ||
437 | vq = v4l2_m2m_get_vq(m2m_ctx, create->format.type); | |
438 | return vb2_create_bufs(vq, create); | |
439 | } | |
440 | EXPORT_SYMBOL_GPL(v4l2_m2m_create_bufs); | |
441 | ||
83ae7c5a TS |
442 | /** |
443 | * v4l2_m2m_expbuf() - export a source or destination buffer, depending on | |
444 | * the type | |
445 | */ | |
446 | int v4l2_m2m_expbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | |
447 | struct v4l2_exportbuffer *eb) | |
448 | { | |
449 | struct vb2_queue *vq; | |
450 | ||
451 | vq = v4l2_m2m_get_vq(m2m_ctx, eb->type); | |
452 | return vb2_expbuf(vq, eb); | |
453 | } | |
454 | EXPORT_SYMBOL_GPL(v4l2_m2m_expbuf); | |
7f98639d PO |
455 | /** |
456 | * v4l2_m2m_streamon() - turn on streaming for a video queue | |
457 | */ | |
458 | int v4l2_m2m_streamon(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | |
459 | enum v4l2_buf_type type) | |
460 | { | |
908a0d7c | 461 | struct vb2_queue *vq; |
7f98639d PO |
462 | int ret; |
463 | ||
464 | vq = v4l2_m2m_get_vq(m2m_ctx, type); | |
908a0d7c | 465 | ret = vb2_streamon(vq, type); |
7f98639d PO |
466 | if (!ret) |
467 | v4l2_m2m_try_schedule(m2m_ctx); | |
468 | ||
469 | return ret; | |
470 | } | |
471 | EXPORT_SYMBOL_GPL(v4l2_m2m_streamon); | |
472 | ||
473 | /** | |
474 | * v4l2_m2m_streamoff() - turn off streaming for a video queue | |
475 | */ | |
476 | int v4l2_m2m_streamoff(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | |
477 | enum v4l2_buf_type type) | |
478 | { | |
401f6a27 JS |
479 | struct v4l2_m2m_dev *m2m_dev; |
480 | struct v4l2_m2m_queue_ctx *q_ctx; | |
481 | unsigned long flags_job, flags; | |
482 | int ret; | |
7f98639d | 483 | |
fea564a5 SAB |
484 | /* wait until the current context is dequeued from job_queue */ |
485 | v4l2_m2m_cancel_job(m2m_ctx); | |
486 | ||
401f6a27 JS |
487 | q_ctx = get_queue_ctx(m2m_ctx, type); |
488 | ret = vb2_streamoff(&q_ctx->q, type); | |
489 | if (ret) | |
490 | return ret; | |
491 | ||
492 | m2m_dev = m2m_ctx->m2m_dev; | |
493 | spin_lock_irqsave(&m2m_dev->job_spinlock, flags_job); | |
494 | /* We should not be scheduled anymore, since we're dropping a queue. */ | |
d7bb0ce8 PZ |
495 | if (m2m_ctx->job_flags & TRANS_QUEUED) |
496 | list_del(&m2m_ctx->queue); | |
401f6a27 JS |
497 | m2m_ctx->job_flags = 0; |
498 | ||
499 | spin_lock_irqsave(&q_ctx->rdy_spinlock, flags); | |
500 | /* Drop queue, since streamoff returns device to the same state as after | |
501 | * calling reqbufs. */ | |
502 | INIT_LIST_HEAD(&q_ctx->rdy_queue); | |
84e68098 | 503 | q_ctx->num_rdy = 0; |
401f6a27 JS |
504 | spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags); |
505 | ||
506 | if (m2m_dev->curr_ctx == m2m_ctx) { | |
507 | m2m_dev->curr_ctx = NULL; | |
508 | wake_up(&m2m_ctx->finished); | |
509 | } | |
510 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job); | |
511 | ||
512 | return 0; | |
7f98639d PO |
513 | } |
514 | EXPORT_SYMBOL_GPL(v4l2_m2m_streamoff); | |
515 | ||
516 | /** | |
517 | * v4l2_m2m_poll() - poll replacement, for destination buffers only | |
518 | * | |
519 | * Call from the driver's poll() function. Will poll both queues. If a buffer | |
520 | * is available to dequeue (with dqbuf) from the source queue, this will | |
521 | * indicate that a non-blocking write can be performed, while read will be | |
522 | * returned in case of the destination queue. | |
523 | */ | |
524 | unsigned int v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | |
525 | struct poll_table_struct *wait) | |
526 | { | |
08eb8510 HV |
527 | struct video_device *vfd = video_devdata(file); |
528 | unsigned long req_events = poll_requested_events(wait); | |
908a0d7c MS |
529 | struct vb2_queue *src_q, *dst_q; |
530 | struct vb2_buffer *src_vb = NULL, *dst_vb = NULL; | |
7f98639d | 531 | unsigned int rc = 0; |
908a0d7c | 532 | unsigned long flags; |
7f98639d | 533 | |
08eb8510 HV |
534 | if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) { |
535 | struct v4l2_fh *fh = file->private_data; | |
536 | ||
537 | if (v4l2_event_pending(fh)) | |
538 | rc = POLLPRI; | |
539 | else if (req_events & POLLPRI) | |
540 | poll_wait(file, &fh->wait, wait); | |
541 | if (!(req_events & (POLLOUT | POLLWRNORM | POLLIN | POLLRDNORM))) | |
542 | return rc; | |
543 | } | |
544 | ||
7f98639d PO |
545 | src_q = v4l2_m2m_get_src_vq(m2m_ctx); |
546 | dst_q = v4l2_m2m_get_dst_vq(m2m_ctx); | |
547 | ||
908a0d7c MS |
548 | /* |
549 | * There has to be at least one buffer queued on each queued_list, which | |
550 | * means either in driver already or waiting for driver to claim it | |
551 | * and start processing. | |
552 | */ | |
553 | if ((!src_q->streaming || list_empty(&src_q->queued_list)) | |
554 | && (!dst_q->streaming || list_empty(&dst_q->queued_list))) { | |
08eb8510 | 555 | rc |= POLLERR; |
7f98639d PO |
556 | goto end; |
557 | } | |
558 | ||
908a0d7c MS |
559 | if (m2m_ctx->m2m_dev->m2m_ops->unlock) |
560 | m2m_ctx->m2m_dev->m2m_ops->unlock(m2m_ctx->priv); | |
561 | ||
57183467 SWK |
562 | if (list_empty(&src_q->done_list)) |
563 | poll_wait(file, &src_q->done_wq, wait); | |
564 | if (list_empty(&dst_q->done_list)) | |
565 | poll_wait(file, &dst_q->done_wq, wait); | |
908a0d7c MS |
566 | |
567 | if (m2m_ctx->m2m_dev->m2m_ops->lock) | |
568 | m2m_ctx->m2m_dev->m2m_ops->lock(m2m_ctx->priv); | |
569 | ||
570 | spin_lock_irqsave(&src_q->done_lock, flags); | |
571 | if (!list_empty(&src_q->done_list)) | |
572 | src_vb = list_first_entry(&src_q->done_list, struct vb2_buffer, | |
573 | done_entry); | |
574 | if (src_vb && (src_vb->state == VB2_BUF_STATE_DONE | |
575 | || src_vb->state == VB2_BUF_STATE_ERROR)) | |
576 | rc |= POLLOUT | POLLWRNORM; | |
577 | spin_unlock_irqrestore(&src_q->done_lock, flags); | |
578 | ||
579 | spin_lock_irqsave(&dst_q->done_lock, flags); | |
580 | if (!list_empty(&dst_q->done_list)) | |
581 | dst_vb = list_first_entry(&dst_q->done_list, struct vb2_buffer, | |
582 | done_entry); | |
583 | if (dst_vb && (dst_vb->state == VB2_BUF_STATE_DONE | |
584 | || dst_vb->state == VB2_BUF_STATE_ERROR)) | |
585 | rc |= POLLIN | POLLRDNORM; | |
586 | spin_unlock_irqrestore(&dst_q->done_lock, flags); | |
7f98639d PO |
587 | |
588 | end: | |
7f98639d PO |
589 | return rc; |
590 | } | |
591 | EXPORT_SYMBOL_GPL(v4l2_m2m_poll); | |
592 | ||
593 | /** | |
594 | * v4l2_m2m_mmap() - source and destination queues-aware mmap multiplexer | |
595 | * | |
596 | * Call from driver's mmap() function. Will handle mmap() for both queues | |
597 | * seamlessly for videobuffer, which will receive normal per-queue offsets and | |
598 | * proper videobuf queue pointers. The differentiation is made outside videobuf | |
599 | * by adding a predefined offset to buffers from one of the queues and | |
600 | * subtracting it before passing it back to videobuf. Only drivers (and | |
601 | * thus applications) receive modified offsets. | |
602 | */ | |
603 | int v4l2_m2m_mmap(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | |
604 | struct vm_area_struct *vma) | |
605 | { | |
606 | unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; | |
908a0d7c | 607 | struct vb2_queue *vq; |
7f98639d PO |
608 | |
609 | if (offset < DST_QUEUE_OFF_BASE) { | |
610 | vq = v4l2_m2m_get_src_vq(m2m_ctx); | |
611 | } else { | |
612 | vq = v4l2_m2m_get_dst_vq(m2m_ctx); | |
613 | vma->vm_pgoff -= (DST_QUEUE_OFF_BASE >> PAGE_SHIFT); | |
614 | } | |
615 | ||
908a0d7c | 616 | return vb2_mmap(vq, vma); |
7f98639d PO |
617 | } |
618 | EXPORT_SYMBOL(v4l2_m2m_mmap); | |
619 | ||
620 | /** | |
621 | * v4l2_m2m_init() - initialize per-driver m2m data | |
622 | * | |
623 | * Usually called from driver's probe() function. | |
624 | */ | |
b1252eb8 | 625 | struct v4l2_m2m_dev *v4l2_m2m_init(const struct v4l2_m2m_ops *m2m_ops) |
7f98639d PO |
626 | { |
627 | struct v4l2_m2m_dev *m2m_dev; | |
628 | ||
3fac4eb3 NT |
629 | if (!m2m_ops || WARN_ON(!m2m_ops->device_run) || |
630 | WARN_ON(!m2m_ops->job_abort)) | |
7f98639d PO |
631 | return ERR_PTR(-EINVAL); |
632 | ||
7f98639d PO |
633 | m2m_dev = kzalloc(sizeof *m2m_dev, GFP_KERNEL); |
634 | if (!m2m_dev) | |
635 | return ERR_PTR(-ENOMEM); | |
636 | ||
637 | m2m_dev->curr_ctx = NULL; | |
638 | m2m_dev->m2m_ops = m2m_ops; | |
639 | INIT_LIST_HEAD(&m2m_dev->job_queue); | |
640 | spin_lock_init(&m2m_dev->job_spinlock); | |
641 | ||
642 | return m2m_dev; | |
643 | } | |
644 | EXPORT_SYMBOL_GPL(v4l2_m2m_init); | |
645 | ||
646 | /** | |
647 | * v4l2_m2m_release() - cleans up and frees a m2m_dev structure | |
648 | * | |
649 | * Usually called from driver's remove() function. | |
650 | */ | |
651 | void v4l2_m2m_release(struct v4l2_m2m_dev *m2m_dev) | |
652 | { | |
653 | kfree(m2m_dev); | |
654 | } | |
655 | EXPORT_SYMBOL_GPL(v4l2_m2m_release); | |
656 | ||
657 | /** | |
658 | * v4l2_m2m_ctx_init() - allocate and initialize a m2m context | |
659 | * @priv - driver's instance private data | |
660 | * @m2m_dev - a previously initialized m2m_dev struct | |
661 | * @vq_init - a callback for queue type-specific initialization function to be | |
662 | * used for initializing videobuf_queues | |
663 | * | |
664 | * Usually called from driver's open() function. | |
665 | */ | |
908a0d7c MS |
666 | struct v4l2_m2m_ctx *v4l2_m2m_ctx_init(struct v4l2_m2m_dev *m2m_dev, |
667 | void *drv_priv, | |
668 | int (*queue_init)(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq)) | |
7f98639d PO |
669 | { |
670 | struct v4l2_m2m_ctx *m2m_ctx; | |
671 | struct v4l2_m2m_queue_ctx *out_q_ctx, *cap_q_ctx; | |
908a0d7c | 672 | int ret; |
7f98639d PO |
673 | |
674 | m2m_ctx = kzalloc(sizeof *m2m_ctx, GFP_KERNEL); | |
675 | if (!m2m_ctx) | |
676 | return ERR_PTR(-ENOMEM); | |
677 | ||
908a0d7c | 678 | m2m_ctx->priv = drv_priv; |
7f98639d | 679 | m2m_ctx->m2m_dev = m2m_dev; |
908a0d7c | 680 | init_waitqueue_head(&m2m_ctx->finished); |
7f98639d | 681 | |
908a0d7c MS |
682 | out_q_ctx = &m2m_ctx->out_q_ctx; |
683 | cap_q_ctx = &m2m_ctx->cap_q_ctx; | |
7f98639d PO |
684 | |
685 | INIT_LIST_HEAD(&out_q_ctx->rdy_queue); | |
686 | INIT_LIST_HEAD(&cap_q_ctx->rdy_queue); | |
908a0d7c MS |
687 | spin_lock_init(&out_q_ctx->rdy_spinlock); |
688 | spin_lock_init(&cap_q_ctx->rdy_spinlock); | |
7f98639d PO |
689 | |
690 | INIT_LIST_HEAD(&m2m_ctx->queue); | |
691 | ||
908a0d7c MS |
692 | ret = queue_init(drv_priv, &out_q_ctx->q, &cap_q_ctx->q); |
693 | ||
694 | if (ret) | |
695 | goto err; | |
7f98639d PO |
696 | |
697 | return m2m_ctx; | |
908a0d7c MS |
698 | err: |
699 | kfree(m2m_ctx); | |
700 | return ERR_PTR(ret); | |
7f98639d PO |
701 | } |
702 | EXPORT_SYMBOL_GPL(v4l2_m2m_ctx_init); | |
703 | ||
704 | /** | |
705 | * v4l2_m2m_ctx_release() - release m2m context | |
706 | * | |
707 | * Usually called from driver's release() function. | |
708 | */ | |
709 | void v4l2_m2m_ctx_release(struct v4l2_m2m_ctx *m2m_ctx) | |
710 | { | |
fea564a5 SAB |
711 | /* wait until the current context is dequeued from job_queue */ |
712 | v4l2_m2m_cancel_job(m2m_ctx); | |
7f98639d | 713 | |
908a0d7c MS |
714 | vb2_queue_release(&m2m_ctx->cap_q_ctx.q); |
715 | vb2_queue_release(&m2m_ctx->out_q_ctx.q); | |
7f98639d PO |
716 | |
717 | kfree(m2m_ctx); | |
718 | } | |
719 | EXPORT_SYMBOL_GPL(v4l2_m2m_ctx_release); | |
720 | ||
721 | /** | |
722 | * v4l2_m2m_buf_queue() - add a buffer to the proper ready buffers list. | |
723 | * | |
724 | * Call from buf_queue(), videobuf_queue_ops callback. | |
7f98639d | 725 | */ |
908a0d7c | 726 | void v4l2_m2m_buf_queue(struct v4l2_m2m_ctx *m2m_ctx, struct vb2_buffer *vb) |
7f98639d | 727 | { |
908a0d7c | 728 | struct v4l2_m2m_buffer *b = container_of(vb, struct v4l2_m2m_buffer, vb); |
7f98639d | 729 | struct v4l2_m2m_queue_ctx *q_ctx; |
908a0d7c | 730 | unsigned long flags; |
7f98639d | 731 | |
908a0d7c | 732 | q_ctx = get_queue_ctx(m2m_ctx, vb->vb2_queue->type); |
7f98639d PO |
733 | if (!q_ctx) |
734 | return; | |
735 | ||
908a0d7c MS |
736 | spin_lock_irqsave(&q_ctx->rdy_spinlock, flags); |
737 | list_add_tail(&b->list, &q_ctx->rdy_queue); | |
7f98639d | 738 | q_ctx->num_rdy++; |
908a0d7c | 739 | spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags); |
7f98639d PO |
740 | } |
741 | EXPORT_SYMBOL_GPL(v4l2_m2m_buf_queue); | |
742 |