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 | ||
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) | |
44 | ||
45 | ||
46 | /* Offset base for buffers on the destination queue - used to distinguish | |
47 | * between source and destination buffers when mmapping - they receive the same | |
48 | * offsets but for different queues */ | |
49 | #define DST_QUEUE_OFF_BASE (1 << 30) | |
50 | ||
51 | ||
52 | /** | |
53 | * struct v4l2_m2m_dev - per-device context | |
54 | * @curr_ctx: currently running instance | |
55 | * @job_queue: instances queued to run | |
56 | * @job_spinlock: protects job_queue | |
57 | * @m2m_ops: driver callbacks | |
58 | */ | |
59 | struct v4l2_m2m_dev { | |
60 | struct v4l2_m2m_ctx *curr_ctx; | |
61 | ||
62 | struct list_head job_queue; | |
63 | spinlock_t job_spinlock; | |
64 | ||
b1252eb8 | 65 | const struct v4l2_m2m_ops *m2m_ops; |
7f98639d PO |
66 | }; |
67 | ||
68 | static struct v4l2_m2m_queue_ctx *get_queue_ctx(struct v4l2_m2m_ctx *m2m_ctx, | |
69 | enum v4l2_buf_type type) | |
70 | { | |
908a0d7c | 71 | if (V4L2_TYPE_IS_OUTPUT(type)) |
7f98639d | 72 | return &m2m_ctx->out_q_ctx; |
908a0d7c MS |
73 | else |
74 | return &m2m_ctx->cap_q_ctx; | |
7f98639d PO |
75 | } |
76 | ||
77 | /** | |
908a0d7c | 78 | * v4l2_m2m_get_vq() - return vb2_queue for the given type |
7f98639d | 79 | */ |
908a0d7c | 80 | struct vb2_queue *v4l2_m2m_get_vq(struct v4l2_m2m_ctx *m2m_ctx, |
7f98639d PO |
81 | enum v4l2_buf_type type) |
82 | { | |
83 | struct v4l2_m2m_queue_ctx *q_ctx; | |
84 | ||
85 | q_ctx = get_queue_ctx(m2m_ctx, type); | |
86 | if (!q_ctx) | |
87 | return NULL; | |
88 | ||
89 | return &q_ctx->q; | |
90 | } | |
91 | EXPORT_SYMBOL(v4l2_m2m_get_vq); | |
92 | ||
93 | /** | |
94 | * v4l2_m2m_next_buf() - return next buffer from the list of ready buffers | |
95 | */ | |
908a0d7c | 96 | void *v4l2_m2m_next_buf(struct v4l2_m2m_queue_ctx *q_ctx) |
7f98639d | 97 | { |
908a0d7c | 98 | struct v4l2_m2m_buffer *b = NULL; |
7f98639d PO |
99 | unsigned long flags; |
100 | ||
908a0d7c | 101 | spin_lock_irqsave(&q_ctx->rdy_spinlock, flags); |
7f98639d | 102 | |
a6bd62be AP |
103 | if (list_empty(&q_ctx->rdy_queue)) { |
104 | spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags); | |
105 | return NULL; | |
106 | } | |
7f98639d | 107 | |
c392e9e1 | 108 | b = list_first_entry(&q_ctx->rdy_queue, struct v4l2_m2m_buffer, list); |
908a0d7c MS |
109 | spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags); |
110 | return &b->vb; | |
7f98639d PO |
111 | } |
112 | EXPORT_SYMBOL_GPL(v4l2_m2m_next_buf); | |
113 | ||
114 | /** | |
115 | * v4l2_m2m_buf_remove() - take off a buffer from the list of ready buffers and | |
116 | * return it | |
117 | */ | |
908a0d7c | 118 | void *v4l2_m2m_buf_remove(struct v4l2_m2m_queue_ctx *q_ctx) |
7f98639d | 119 | { |
908a0d7c | 120 | struct v4l2_m2m_buffer *b = NULL; |
7f98639d PO |
121 | unsigned long flags; |
122 | ||
908a0d7c | 123 | spin_lock_irqsave(&q_ctx->rdy_spinlock, flags); |
a6bd62be AP |
124 | if (list_empty(&q_ctx->rdy_queue)) { |
125 | spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags); | |
126 | return NULL; | |
7f98639d | 127 | } |
c392e9e1 | 128 | b = list_first_entry(&q_ctx->rdy_queue, struct v4l2_m2m_buffer, list); |
a6bd62be AP |
129 | list_del(&b->list); |
130 | q_ctx->num_rdy--; | |
908a0d7c | 131 | spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags); |
7f98639d | 132 | |
908a0d7c | 133 | return &b->vb; |
7f98639d PO |
134 | } |
135 | EXPORT_SYMBOL_GPL(v4l2_m2m_buf_remove); | |
136 | ||
137 | /* | |
138 | * Scheduling handlers | |
139 | */ | |
140 | ||
141 | /** | |
142 | * v4l2_m2m_get_curr_priv() - return driver private data for the currently | |
143 | * running instance or NULL if no instance is running | |
144 | */ | |
145 | void *v4l2_m2m_get_curr_priv(struct v4l2_m2m_dev *m2m_dev) | |
146 | { | |
147 | unsigned long flags; | |
148 | void *ret = NULL; | |
149 | ||
150 | spin_lock_irqsave(&m2m_dev->job_spinlock, flags); | |
151 | if (m2m_dev->curr_ctx) | |
152 | ret = m2m_dev->curr_ctx->priv; | |
153 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | |
154 | ||
155 | return ret; | |
156 | } | |
157 | EXPORT_SYMBOL(v4l2_m2m_get_curr_priv); | |
158 | ||
159 | /** | |
160 | * v4l2_m2m_try_run() - select next job to perform and run it if possible | |
161 | * | |
162 | * Get next transaction (if present) from the waiting jobs list and run it. | |
163 | */ | |
164 | static void v4l2_m2m_try_run(struct v4l2_m2m_dev *m2m_dev) | |
165 | { | |
166 | unsigned long flags; | |
167 | ||
168 | spin_lock_irqsave(&m2m_dev->job_spinlock, flags); | |
169 | if (NULL != m2m_dev->curr_ctx) { | |
170 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | |
171 | dprintk("Another instance is running, won't run now\n"); | |
172 | return; | |
173 | } | |
174 | ||
175 | if (list_empty(&m2m_dev->job_queue)) { | |
176 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | |
177 | dprintk("No job pending\n"); | |
178 | return; | |
179 | } | |
180 | ||
c392e9e1 | 181 | m2m_dev->curr_ctx = list_first_entry(&m2m_dev->job_queue, |
7f98639d PO |
182 | struct v4l2_m2m_ctx, queue); |
183 | m2m_dev->curr_ctx->job_flags |= TRANS_RUNNING; | |
184 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | |
185 | ||
186 | m2m_dev->m2m_ops->device_run(m2m_dev->curr_ctx->priv); | |
187 | } | |
188 | ||
189 | /** | |
190 | * v4l2_m2m_try_schedule() - check whether an instance is ready to be added to | |
191 | * the pending job queue and add it if so. | |
192 | * @m2m_ctx: m2m context assigned to the instance to be checked | |
193 | * | |
194 | * There are three basic requirements an instance has to meet to be able to run: | |
195 | * 1) at least one source buffer has to be queued, | |
196 | * 2) at least one destination buffer has to be queued, | |
197 | * 3) streaming has to be on. | |
198 | * | |
33bdd5a8 PZ |
199 | * If a queue is buffered (for example a decoder hardware ringbuffer that has |
200 | * to be drained before doing streamoff), allow scheduling without v4l2 buffers | |
201 | * on that queue. | |
202 | * | |
7f98639d PO |
203 | * There may also be additional, custom requirements. In such case the driver |
204 | * should supply a custom callback (job_ready in v4l2_m2m_ops) that should | |
205 | * return 1 if the instance is ready. | |
206 | * An example of the above could be an instance that requires more than one | |
207 | * src/dst buffer per transaction. | |
208 | */ | |
209 | static void v4l2_m2m_try_schedule(struct v4l2_m2m_ctx *m2m_ctx) | |
210 | { | |
211 | struct v4l2_m2m_dev *m2m_dev; | |
b730627a | 212 | unsigned long flags_job, flags_out, flags_cap; |
7f98639d PO |
213 | |
214 | m2m_dev = m2m_ctx->m2m_dev; | |
215 | dprintk("Trying to schedule a job for m2m_ctx: %p\n", m2m_ctx); | |
216 | ||
217 | if (!m2m_ctx->out_q_ctx.q.streaming | |
218 | || !m2m_ctx->cap_q_ctx.q.streaming) { | |
219 | dprintk("Streaming needs to be on for both queues\n"); | |
220 | return; | |
221 | } | |
222 | ||
223 | spin_lock_irqsave(&m2m_dev->job_spinlock, flags_job); | |
224 | if (m2m_ctx->job_flags & TRANS_QUEUED) { | |
225 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job); | |
226 | dprintk("On job queue already\n"); | |
227 | return; | |
228 | } | |
229 | ||
b730627a | 230 | spin_lock_irqsave(&m2m_ctx->out_q_ctx.rdy_spinlock, flags_out); |
33bdd5a8 PZ |
231 | if (list_empty(&m2m_ctx->out_q_ctx.rdy_queue) |
232 | && !m2m_ctx->out_q_ctx.buffered) { | |
b730627a JS |
233 | spin_unlock_irqrestore(&m2m_ctx->out_q_ctx.rdy_spinlock, |
234 | flags_out); | |
7f98639d PO |
235 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job); |
236 | dprintk("No input buffers available\n"); | |
237 | return; | |
238 | } | |
b730627a | 239 | spin_lock_irqsave(&m2m_ctx->cap_q_ctx.rdy_spinlock, flags_cap); |
33bdd5a8 PZ |
240 | if (list_empty(&m2m_ctx->cap_q_ctx.rdy_queue) |
241 | && !m2m_ctx->cap_q_ctx.buffered) { | |
b730627a JS |
242 | spin_unlock_irqrestore(&m2m_ctx->cap_q_ctx.rdy_spinlock, |
243 | flags_cap); | |
244 | spin_unlock_irqrestore(&m2m_ctx->out_q_ctx.rdy_spinlock, | |
245 | flags_out); | |
7f98639d PO |
246 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job); |
247 | dprintk("No output buffers available\n"); | |
248 | return; | |
249 | } | |
b730627a JS |
250 | spin_unlock_irqrestore(&m2m_ctx->cap_q_ctx.rdy_spinlock, flags_cap); |
251 | spin_unlock_irqrestore(&m2m_ctx->out_q_ctx.rdy_spinlock, flags_out); | |
7f98639d PO |
252 | |
253 | if (m2m_dev->m2m_ops->job_ready | |
254 | && (!m2m_dev->m2m_ops->job_ready(m2m_ctx->priv))) { | |
255 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job); | |
256 | dprintk("Driver not ready\n"); | |
257 | return; | |
258 | } | |
259 | ||
260 | list_add_tail(&m2m_ctx->queue, &m2m_dev->job_queue); | |
261 | m2m_ctx->job_flags |= TRANS_QUEUED; | |
262 | ||
263 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job); | |
264 | ||
265 | v4l2_m2m_try_run(m2m_dev); | |
266 | } | |
267 | ||
fea564a5 SAB |
268 | /** |
269 | * v4l2_m2m_cancel_job() - cancel pending jobs for the context | |
270 | * | |
271 | * In case of streamoff or release called on any context, | |
272 | * 1] If the context is currently running, then abort job will be called | |
273 | * 2] If the context is queued, then the context will be removed from | |
274 | * the job_queue | |
275 | */ | |
276 | static void v4l2_m2m_cancel_job(struct v4l2_m2m_ctx *m2m_ctx) | |
277 | { | |
278 | struct v4l2_m2m_dev *m2m_dev; | |
279 | unsigned long flags; | |
280 | ||
281 | m2m_dev = m2m_ctx->m2m_dev; | |
282 | spin_lock_irqsave(&m2m_dev->job_spinlock, flags); | |
283 | if (m2m_ctx->job_flags & TRANS_RUNNING) { | |
284 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | |
285 | m2m_dev->m2m_ops->job_abort(m2m_ctx->priv); | |
286 | dprintk("m2m_ctx %p running, will wait to complete", m2m_ctx); | |
287 | wait_event(m2m_ctx->finished, | |
288 | !(m2m_ctx->job_flags & TRANS_RUNNING)); | |
289 | } else if (m2m_ctx->job_flags & TRANS_QUEUED) { | |
290 | list_del(&m2m_ctx->queue); | |
291 | m2m_ctx->job_flags &= ~(TRANS_QUEUED | TRANS_RUNNING); | |
292 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | |
293 | dprintk("m2m_ctx: %p had been on queue and was removed\n", | |
294 | m2m_ctx); | |
295 | } else { | |
296 | /* Do nothing, was not on queue/running */ | |
297 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | |
298 | } | |
299 | } | |
300 | ||
7f98639d PO |
301 | /** |
302 | * v4l2_m2m_job_finish() - inform the framework that a job has been finished | |
303 | * and have it clean up | |
304 | * | |
305 | * Called by a driver to yield back the device after it has finished with it. | |
306 | * Should be called as soon as possible after reaching a state which allows | |
307 | * other instances to take control of the device. | |
308 | * | |
309 | * This function has to be called only after device_run() callback has been | |
310 | * called on the driver. To prevent recursion, it should not be called directly | |
311 | * from the device_run() callback though. | |
312 | */ | |
313 | void v4l2_m2m_job_finish(struct v4l2_m2m_dev *m2m_dev, | |
314 | struct v4l2_m2m_ctx *m2m_ctx) | |
315 | { | |
316 | unsigned long flags; | |
317 | ||
318 | spin_lock_irqsave(&m2m_dev->job_spinlock, flags); | |
319 | if (!m2m_dev->curr_ctx || m2m_dev->curr_ctx != m2m_ctx) { | |
320 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | |
321 | dprintk("Called by an instance not currently running\n"); | |
322 | return; | |
323 | } | |
324 | ||
325 | list_del(&m2m_dev->curr_ctx->queue); | |
326 | m2m_dev->curr_ctx->job_flags &= ~(TRANS_QUEUED | TRANS_RUNNING); | |
908a0d7c | 327 | wake_up(&m2m_dev->curr_ctx->finished); |
7f98639d PO |
328 | m2m_dev->curr_ctx = NULL; |
329 | ||
330 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | |
331 | ||
332 | /* This instance might have more buffers ready, but since we do not | |
333 | * allow more than one job on the job_queue per instance, each has | |
334 | * to be scheduled separately after the previous one finishes. */ | |
335 | v4l2_m2m_try_schedule(m2m_ctx); | |
336 | v4l2_m2m_try_run(m2m_dev); | |
337 | } | |
338 | EXPORT_SYMBOL(v4l2_m2m_job_finish); | |
339 | ||
340 | /** | |
341 | * v4l2_m2m_reqbufs() - multi-queue-aware REQBUFS multiplexer | |
342 | */ | |
343 | int v4l2_m2m_reqbufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | |
344 | struct v4l2_requestbuffers *reqbufs) | |
345 | { | |
908a0d7c | 346 | struct vb2_queue *vq; |
7f98639d PO |
347 | |
348 | vq = v4l2_m2m_get_vq(m2m_ctx, reqbufs->type); | |
908a0d7c | 349 | return vb2_reqbufs(vq, reqbufs); |
7f98639d PO |
350 | } |
351 | EXPORT_SYMBOL_GPL(v4l2_m2m_reqbufs); | |
352 | ||
353 | /** | |
354 | * v4l2_m2m_querybuf() - multi-queue-aware QUERYBUF multiplexer | |
355 | * | |
356 | * See v4l2_m2m_mmap() documentation for details. | |
357 | */ | |
358 | int v4l2_m2m_querybuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | |
359 | struct v4l2_buffer *buf) | |
360 | { | |
908a0d7c MS |
361 | struct vb2_queue *vq; |
362 | int ret = 0; | |
363 | unsigned int i; | |
7f98639d PO |
364 | |
365 | vq = v4l2_m2m_get_vq(m2m_ctx, buf->type); | |
908a0d7c MS |
366 | ret = vb2_querybuf(vq, buf); |
367 | ||
368 | /* Adjust MMAP memory offsets for the CAPTURE queue */ | |
369 | if (buf->memory == V4L2_MEMORY_MMAP && !V4L2_TYPE_IS_OUTPUT(vq->type)) { | |
370 | if (V4L2_TYPE_IS_MULTIPLANAR(vq->type)) { | |
371 | for (i = 0; i < buf->length; ++i) | |
372 | buf->m.planes[i].m.mem_offset | |
373 | += DST_QUEUE_OFF_BASE; | |
374 | } else { | |
375 | buf->m.offset += DST_QUEUE_OFF_BASE; | |
376 | } | |
7f98639d PO |
377 | } |
378 | ||
379 | return ret; | |
380 | } | |
381 | EXPORT_SYMBOL_GPL(v4l2_m2m_querybuf); | |
382 | ||
383 | /** | |
384 | * v4l2_m2m_qbuf() - enqueue a source or destination buffer, depending on | |
385 | * the type | |
386 | */ | |
387 | int v4l2_m2m_qbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | |
388 | struct v4l2_buffer *buf) | |
389 | { | |
908a0d7c | 390 | struct vb2_queue *vq; |
7f98639d PO |
391 | int ret; |
392 | ||
393 | vq = v4l2_m2m_get_vq(m2m_ctx, buf->type); | |
908a0d7c | 394 | ret = vb2_qbuf(vq, buf); |
7f98639d PO |
395 | if (!ret) |
396 | v4l2_m2m_try_schedule(m2m_ctx); | |
397 | ||
398 | return ret; | |
399 | } | |
400 | EXPORT_SYMBOL_GPL(v4l2_m2m_qbuf); | |
401 | ||
402 | /** | |
403 | * v4l2_m2m_dqbuf() - dequeue a source or destination buffer, depending on | |
404 | * the type | |
405 | */ | |
406 | int v4l2_m2m_dqbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | |
407 | struct v4l2_buffer *buf) | |
408 | { | |
908a0d7c | 409 | struct vb2_queue *vq; |
7f98639d PO |
410 | |
411 | vq = v4l2_m2m_get_vq(m2m_ctx, buf->type); | |
908a0d7c | 412 | return vb2_dqbuf(vq, buf, file->f_flags & O_NONBLOCK); |
7f98639d PO |
413 | } |
414 | EXPORT_SYMBOL_GPL(v4l2_m2m_dqbuf); | |
415 | ||
8b94ca61 PZ |
416 | /** |
417 | * v4l2_m2m_create_bufs() - create a source or destination buffer, depending | |
418 | * on the type | |
419 | */ | |
420 | int v4l2_m2m_create_bufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | |
421 | struct v4l2_create_buffers *create) | |
422 | { | |
423 | struct vb2_queue *vq; | |
424 | ||
425 | vq = v4l2_m2m_get_vq(m2m_ctx, create->format.type); | |
426 | return vb2_create_bufs(vq, create); | |
427 | } | |
428 | EXPORT_SYMBOL_GPL(v4l2_m2m_create_bufs); | |
429 | ||
83ae7c5a TS |
430 | /** |
431 | * v4l2_m2m_expbuf() - export a source or destination buffer, depending on | |
432 | * the type | |
433 | */ | |
434 | int v4l2_m2m_expbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | |
435 | struct v4l2_exportbuffer *eb) | |
436 | { | |
437 | struct vb2_queue *vq; | |
438 | ||
439 | vq = v4l2_m2m_get_vq(m2m_ctx, eb->type); | |
440 | return vb2_expbuf(vq, eb); | |
441 | } | |
442 | EXPORT_SYMBOL_GPL(v4l2_m2m_expbuf); | |
7f98639d PO |
443 | /** |
444 | * v4l2_m2m_streamon() - turn on streaming for a video queue | |
445 | */ | |
446 | int v4l2_m2m_streamon(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | |
447 | enum v4l2_buf_type type) | |
448 | { | |
908a0d7c | 449 | struct vb2_queue *vq; |
7f98639d PO |
450 | int ret; |
451 | ||
452 | vq = v4l2_m2m_get_vq(m2m_ctx, type); | |
908a0d7c | 453 | ret = vb2_streamon(vq, type); |
7f98639d PO |
454 | if (!ret) |
455 | v4l2_m2m_try_schedule(m2m_ctx); | |
456 | ||
457 | return ret; | |
458 | } | |
459 | EXPORT_SYMBOL_GPL(v4l2_m2m_streamon); | |
460 | ||
461 | /** | |
462 | * v4l2_m2m_streamoff() - turn off streaming for a video queue | |
463 | */ | |
464 | int v4l2_m2m_streamoff(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | |
465 | enum v4l2_buf_type type) | |
466 | { | |
401f6a27 JS |
467 | struct v4l2_m2m_dev *m2m_dev; |
468 | struct v4l2_m2m_queue_ctx *q_ctx; | |
469 | unsigned long flags_job, flags; | |
470 | int ret; | |
7f98639d | 471 | |
fea564a5 SAB |
472 | /* wait until the current context is dequeued from job_queue */ |
473 | v4l2_m2m_cancel_job(m2m_ctx); | |
474 | ||
401f6a27 JS |
475 | q_ctx = get_queue_ctx(m2m_ctx, type); |
476 | ret = vb2_streamoff(&q_ctx->q, type); | |
477 | if (ret) | |
478 | return ret; | |
479 | ||
480 | m2m_dev = m2m_ctx->m2m_dev; | |
481 | spin_lock_irqsave(&m2m_dev->job_spinlock, flags_job); | |
482 | /* We should not be scheduled anymore, since we're dropping a queue. */ | |
d7bb0ce8 PZ |
483 | if (m2m_ctx->job_flags & TRANS_QUEUED) |
484 | list_del(&m2m_ctx->queue); | |
401f6a27 JS |
485 | m2m_ctx->job_flags = 0; |
486 | ||
487 | spin_lock_irqsave(&q_ctx->rdy_spinlock, flags); | |
488 | /* Drop queue, since streamoff returns device to the same state as after | |
489 | * calling reqbufs. */ | |
490 | INIT_LIST_HEAD(&q_ctx->rdy_queue); | |
491 | spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags); | |
492 | ||
493 | if (m2m_dev->curr_ctx == m2m_ctx) { | |
494 | m2m_dev->curr_ctx = NULL; | |
495 | wake_up(&m2m_ctx->finished); | |
496 | } | |
497 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job); | |
498 | ||
499 | return 0; | |
7f98639d PO |
500 | } |
501 | EXPORT_SYMBOL_GPL(v4l2_m2m_streamoff); | |
502 | ||
503 | /** | |
504 | * v4l2_m2m_poll() - poll replacement, for destination buffers only | |
505 | * | |
506 | * Call from the driver's poll() function. Will poll both queues. If a buffer | |
507 | * is available to dequeue (with dqbuf) from the source queue, this will | |
508 | * indicate that a non-blocking write can be performed, while read will be | |
509 | * returned in case of the destination queue. | |
510 | */ | |
511 | unsigned int v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | |
512 | struct poll_table_struct *wait) | |
513 | { | |
08eb8510 HV |
514 | struct video_device *vfd = video_devdata(file); |
515 | unsigned long req_events = poll_requested_events(wait); | |
908a0d7c MS |
516 | struct vb2_queue *src_q, *dst_q; |
517 | struct vb2_buffer *src_vb = NULL, *dst_vb = NULL; | |
7f98639d | 518 | unsigned int rc = 0; |
908a0d7c | 519 | unsigned long flags; |
7f98639d | 520 | |
08eb8510 HV |
521 | if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) { |
522 | struct v4l2_fh *fh = file->private_data; | |
523 | ||
524 | if (v4l2_event_pending(fh)) | |
525 | rc = POLLPRI; | |
526 | else if (req_events & POLLPRI) | |
527 | poll_wait(file, &fh->wait, wait); | |
528 | if (!(req_events & (POLLOUT | POLLWRNORM | POLLIN | POLLRDNORM))) | |
529 | return rc; | |
530 | } | |
531 | ||
7f98639d PO |
532 | src_q = v4l2_m2m_get_src_vq(m2m_ctx); |
533 | dst_q = v4l2_m2m_get_dst_vq(m2m_ctx); | |
534 | ||
908a0d7c MS |
535 | /* |
536 | * There has to be at least one buffer queued on each queued_list, which | |
537 | * means either in driver already or waiting for driver to claim it | |
538 | * and start processing. | |
539 | */ | |
540 | if ((!src_q->streaming || list_empty(&src_q->queued_list)) | |
541 | && (!dst_q->streaming || list_empty(&dst_q->queued_list))) { | |
08eb8510 | 542 | rc |= POLLERR; |
7f98639d PO |
543 | goto end; |
544 | } | |
545 | ||
908a0d7c MS |
546 | if (m2m_ctx->m2m_dev->m2m_ops->unlock) |
547 | m2m_ctx->m2m_dev->m2m_ops->unlock(m2m_ctx->priv); | |
548 | ||
57183467 SWK |
549 | if (list_empty(&src_q->done_list)) |
550 | poll_wait(file, &src_q->done_wq, wait); | |
551 | if (list_empty(&dst_q->done_list)) | |
552 | poll_wait(file, &dst_q->done_wq, wait); | |
908a0d7c MS |
553 | |
554 | if (m2m_ctx->m2m_dev->m2m_ops->lock) | |
555 | m2m_ctx->m2m_dev->m2m_ops->lock(m2m_ctx->priv); | |
556 | ||
557 | spin_lock_irqsave(&src_q->done_lock, flags); | |
558 | if (!list_empty(&src_q->done_list)) | |
559 | src_vb = list_first_entry(&src_q->done_list, struct vb2_buffer, | |
560 | done_entry); | |
561 | if (src_vb && (src_vb->state == VB2_BUF_STATE_DONE | |
562 | || src_vb->state == VB2_BUF_STATE_ERROR)) | |
563 | rc |= POLLOUT | POLLWRNORM; | |
564 | spin_unlock_irqrestore(&src_q->done_lock, flags); | |
565 | ||
566 | spin_lock_irqsave(&dst_q->done_lock, flags); | |
567 | if (!list_empty(&dst_q->done_list)) | |
568 | dst_vb = list_first_entry(&dst_q->done_list, struct vb2_buffer, | |
569 | done_entry); | |
570 | if (dst_vb && (dst_vb->state == VB2_BUF_STATE_DONE | |
571 | || dst_vb->state == VB2_BUF_STATE_ERROR)) | |
572 | rc |= POLLIN | POLLRDNORM; | |
573 | spin_unlock_irqrestore(&dst_q->done_lock, flags); | |
7f98639d PO |
574 | |
575 | end: | |
7f98639d PO |
576 | return rc; |
577 | } | |
578 | EXPORT_SYMBOL_GPL(v4l2_m2m_poll); | |
579 | ||
580 | /** | |
581 | * v4l2_m2m_mmap() - source and destination queues-aware mmap multiplexer | |
582 | * | |
583 | * Call from driver's mmap() function. Will handle mmap() for both queues | |
584 | * seamlessly for videobuffer, which will receive normal per-queue offsets and | |
585 | * proper videobuf queue pointers. The differentiation is made outside videobuf | |
586 | * by adding a predefined offset to buffers from one of the queues and | |
587 | * subtracting it before passing it back to videobuf. Only drivers (and | |
588 | * thus applications) receive modified offsets. | |
589 | */ | |
590 | int v4l2_m2m_mmap(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | |
591 | struct vm_area_struct *vma) | |
592 | { | |
593 | unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; | |
908a0d7c | 594 | struct vb2_queue *vq; |
7f98639d PO |
595 | |
596 | if (offset < DST_QUEUE_OFF_BASE) { | |
597 | vq = v4l2_m2m_get_src_vq(m2m_ctx); | |
598 | } else { | |
599 | vq = v4l2_m2m_get_dst_vq(m2m_ctx); | |
600 | vma->vm_pgoff -= (DST_QUEUE_OFF_BASE >> PAGE_SHIFT); | |
601 | } | |
602 | ||
908a0d7c | 603 | return vb2_mmap(vq, vma); |
7f98639d PO |
604 | } |
605 | EXPORT_SYMBOL(v4l2_m2m_mmap); | |
606 | ||
607 | /** | |
608 | * v4l2_m2m_init() - initialize per-driver m2m data | |
609 | * | |
610 | * Usually called from driver's probe() function. | |
611 | */ | |
b1252eb8 | 612 | struct v4l2_m2m_dev *v4l2_m2m_init(const struct v4l2_m2m_ops *m2m_ops) |
7f98639d PO |
613 | { |
614 | struct v4l2_m2m_dev *m2m_dev; | |
615 | ||
3fac4eb3 NT |
616 | if (!m2m_ops || WARN_ON(!m2m_ops->device_run) || |
617 | WARN_ON(!m2m_ops->job_abort)) | |
7f98639d PO |
618 | return ERR_PTR(-EINVAL); |
619 | ||
7f98639d PO |
620 | m2m_dev = kzalloc(sizeof *m2m_dev, GFP_KERNEL); |
621 | if (!m2m_dev) | |
622 | return ERR_PTR(-ENOMEM); | |
623 | ||
624 | m2m_dev->curr_ctx = NULL; | |
625 | m2m_dev->m2m_ops = m2m_ops; | |
626 | INIT_LIST_HEAD(&m2m_dev->job_queue); | |
627 | spin_lock_init(&m2m_dev->job_spinlock); | |
628 | ||
629 | return m2m_dev; | |
630 | } | |
631 | EXPORT_SYMBOL_GPL(v4l2_m2m_init); | |
632 | ||
633 | /** | |
634 | * v4l2_m2m_release() - cleans up and frees a m2m_dev structure | |
635 | * | |
636 | * Usually called from driver's remove() function. | |
637 | */ | |
638 | void v4l2_m2m_release(struct v4l2_m2m_dev *m2m_dev) | |
639 | { | |
640 | kfree(m2m_dev); | |
641 | } | |
642 | EXPORT_SYMBOL_GPL(v4l2_m2m_release); | |
643 | ||
644 | /** | |
645 | * v4l2_m2m_ctx_init() - allocate and initialize a m2m context | |
646 | * @priv - driver's instance private data | |
647 | * @m2m_dev - a previously initialized m2m_dev struct | |
648 | * @vq_init - a callback for queue type-specific initialization function to be | |
649 | * used for initializing videobuf_queues | |
650 | * | |
651 | * Usually called from driver's open() function. | |
652 | */ | |
908a0d7c MS |
653 | struct v4l2_m2m_ctx *v4l2_m2m_ctx_init(struct v4l2_m2m_dev *m2m_dev, |
654 | void *drv_priv, | |
655 | int (*queue_init)(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq)) | |
7f98639d PO |
656 | { |
657 | struct v4l2_m2m_ctx *m2m_ctx; | |
658 | struct v4l2_m2m_queue_ctx *out_q_ctx, *cap_q_ctx; | |
908a0d7c | 659 | int ret; |
7f98639d PO |
660 | |
661 | m2m_ctx = kzalloc(sizeof *m2m_ctx, GFP_KERNEL); | |
662 | if (!m2m_ctx) | |
663 | return ERR_PTR(-ENOMEM); | |
664 | ||
908a0d7c | 665 | m2m_ctx->priv = drv_priv; |
7f98639d | 666 | m2m_ctx->m2m_dev = m2m_dev; |
908a0d7c | 667 | init_waitqueue_head(&m2m_ctx->finished); |
7f98639d | 668 | |
908a0d7c MS |
669 | out_q_ctx = &m2m_ctx->out_q_ctx; |
670 | cap_q_ctx = &m2m_ctx->cap_q_ctx; | |
7f98639d PO |
671 | |
672 | INIT_LIST_HEAD(&out_q_ctx->rdy_queue); | |
673 | INIT_LIST_HEAD(&cap_q_ctx->rdy_queue); | |
908a0d7c MS |
674 | spin_lock_init(&out_q_ctx->rdy_spinlock); |
675 | spin_lock_init(&cap_q_ctx->rdy_spinlock); | |
7f98639d PO |
676 | |
677 | INIT_LIST_HEAD(&m2m_ctx->queue); | |
678 | ||
908a0d7c MS |
679 | ret = queue_init(drv_priv, &out_q_ctx->q, &cap_q_ctx->q); |
680 | ||
681 | if (ret) | |
682 | goto err; | |
7f98639d PO |
683 | |
684 | return m2m_ctx; | |
908a0d7c MS |
685 | err: |
686 | kfree(m2m_ctx); | |
687 | return ERR_PTR(ret); | |
7f98639d PO |
688 | } |
689 | EXPORT_SYMBOL_GPL(v4l2_m2m_ctx_init); | |
690 | ||
691 | /** | |
692 | * v4l2_m2m_ctx_release() - release m2m context | |
693 | * | |
694 | * Usually called from driver's release() function. | |
695 | */ | |
696 | void v4l2_m2m_ctx_release(struct v4l2_m2m_ctx *m2m_ctx) | |
697 | { | |
fea564a5 SAB |
698 | /* wait until the current context is dequeued from job_queue */ |
699 | v4l2_m2m_cancel_job(m2m_ctx); | |
7f98639d | 700 | |
908a0d7c MS |
701 | vb2_queue_release(&m2m_ctx->cap_q_ctx.q); |
702 | vb2_queue_release(&m2m_ctx->out_q_ctx.q); | |
7f98639d PO |
703 | |
704 | kfree(m2m_ctx); | |
705 | } | |
706 | EXPORT_SYMBOL_GPL(v4l2_m2m_ctx_release); | |
707 | ||
708 | /** | |
709 | * v4l2_m2m_buf_queue() - add a buffer to the proper ready buffers list. | |
710 | * | |
711 | * Call from buf_queue(), videobuf_queue_ops callback. | |
7f98639d | 712 | */ |
908a0d7c | 713 | void v4l2_m2m_buf_queue(struct v4l2_m2m_ctx *m2m_ctx, struct vb2_buffer *vb) |
7f98639d | 714 | { |
908a0d7c | 715 | struct v4l2_m2m_buffer *b = container_of(vb, struct v4l2_m2m_buffer, vb); |
7f98639d | 716 | struct v4l2_m2m_queue_ctx *q_ctx; |
908a0d7c | 717 | unsigned long flags; |
7f98639d | 718 | |
908a0d7c | 719 | q_ctx = get_queue_ctx(m2m_ctx, vb->vb2_queue->type); |
7f98639d PO |
720 | if (!q_ctx) |
721 | return; | |
722 | ||
908a0d7c MS |
723 | spin_lock_irqsave(&q_ctx->rdy_spinlock, flags); |
724 | list_add_tail(&b->list, &q_ctx->rdy_queue); | |
7f98639d | 725 | q_ctx->num_rdy++; |
908a0d7c | 726 | spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags); |
7f98639d PO |
727 | } |
728 | EXPORT_SYMBOL_GPL(v4l2_m2m_buf_queue); | |
729 |