diff options
Diffstat (limited to 'drivers/media/video/v4l2-mem2mem.c')
-rw-r--r-- | drivers/media/video/v4l2-mem2mem.c | 629 |
1 files changed, 629 insertions, 0 deletions
diff --git a/drivers/media/video/v4l2-mem2mem.c b/drivers/media/video/v4l2-mem2mem.c new file mode 100644 index 00000000000..3b15bf5892a --- /dev/null +++ b/drivers/media/video/v4l2-mem2mem.c | |||
@@ -0,0 +1,629 @@ | |||
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. | ||
8 | * Pawel Osciak, <pawel@osciak.com> | ||
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 | |||
20 | #include <media/videobuf2-core.h> | ||
21 | #include <media/v4l2-mem2mem.h> | ||
22 | |||
23 | MODULE_DESCRIPTION("Mem to mem device framework for videobuf"); | ||
24 | MODULE_AUTHOR("Pawel Osciak, <pawel@osciak.com>"); | ||
25 | MODULE_LICENSE("GPL"); | ||
26 | |||
27 | static bool debug; | ||
28 | module_param(debug, bool, 0644); | ||
29 | |||
30 | #define dprintk(fmt, arg...) \ | ||
31 | do { \ | ||
32 | if (debug) \ | ||
33 | printk(KERN_DEBUG "%s: " fmt, __func__, ## arg);\ | ||
34 | } while (0) | ||
35 | |||
36 | |||
37 | /* Instance is already queued on the job_queue */ | ||
38 | #define TRANS_QUEUED (1 << 0) | ||
39 | /* Instance is currently running in hardware */ | ||
40 | #define TRANS_RUNNING (1 << 1) | ||
41 | |||
42 | |||
43 | /* Offset base for buffers on the destination queue - used to distinguish | ||
44 | * between source and destination buffers when mmapping - they receive the same | ||
45 | * offsets but for different queues */ | ||
46 | #define DST_QUEUE_OFF_BASE (1 << 30) | ||
47 | |||
48 | |||
49 | /** | ||
50 | * struct v4l2_m2m_dev - per-device context | ||
51 | * @curr_ctx: currently running instance | ||
52 | * @job_queue: instances queued to run | ||
53 | * @job_spinlock: protects job_queue | ||
54 | * @m2m_ops: driver callbacks | ||
55 | */ | ||
56 | struct v4l2_m2m_dev { | ||
57 | struct v4l2_m2m_ctx *curr_ctx; | ||
58 | |||
59 | struct list_head job_queue; | ||
60 | spinlock_t job_spinlock; | ||
61 | |||
62 | struct v4l2_m2m_ops *m2m_ops; | ||
63 | }; | ||
64 | |||
65 | static struct v4l2_m2m_queue_ctx *get_queue_ctx(struct v4l2_m2m_ctx *m2m_ctx, | ||
66 | enum v4l2_buf_type type) | ||
67 | { | ||
68 | if (V4L2_TYPE_IS_OUTPUT(type)) | ||
69 | return &m2m_ctx->out_q_ctx; | ||
70 | else | ||
71 | return &m2m_ctx->cap_q_ctx; | ||
72 | } | ||
73 | |||
74 | /** | ||
75 | * v4l2_m2m_get_vq() - return vb2_queue for the given type | ||
76 | */ | ||
77 | struct vb2_queue *v4l2_m2m_get_vq(struct v4l2_m2m_ctx *m2m_ctx, | ||
78 | enum v4l2_buf_type type) | ||
79 | { | ||
80 | struct v4l2_m2m_queue_ctx *q_ctx; | ||
81 | |||
82 | q_ctx = get_queue_ctx(m2m_ctx, type); | ||
83 | if (!q_ctx) | ||
84 | return NULL; | ||
85 | |||
86 | return &q_ctx->q; | ||
87 | } | ||
88 | EXPORT_SYMBOL(v4l2_m2m_get_vq); | ||
89 | |||
90 | /** | ||
91 | * v4l2_m2m_next_buf() - return next buffer from the list of ready buffers | ||
92 | */ | ||
93 | void *v4l2_m2m_next_buf(struct v4l2_m2m_queue_ctx *q_ctx) | ||
94 | { | ||
95 | struct v4l2_m2m_buffer *b = NULL; | ||
96 | unsigned long flags; | ||
97 | |||
98 | spin_lock_irqsave(&q_ctx->rdy_spinlock, flags); | ||
99 | |||
100 | if (list_empty(&q_ctx->rdy_queue)) | ||
101 | goto end; | ||
102 | |||
103 | b = list_entry(q_ctx->rdy_queue.next, struct v4l2_m2m_buffer, list); | ||
104 | end: | ||
105 | spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags); | ||
106 | return &b->vb; | ||
107 | } | ||
108 | EXPORT_SYMBOL_GPL(v4l2_m2m_next_buf); | ||
109 | |||
110 | /** | ||
111 | * v4l2_m2m_buf_remove() - take off a buffer from the list of ready buffers and | ||
112 | * return it | ||
113 | */ | ||
114 | void *v4l2_m2m_buf_remove(struct v4l2_m2m_queue_ctx *q_ctx) | ||
115 | { | ||
116 | struct v4l2_m2m_buffer *b = NULL; | ||
117 | unsigned long flags; | ||
118 | |||
119 | spin_lock_irqsave(&q_ctx->rdy_spinlock, flags); | ||
120 | if (!list_empty(&q_ctx->rdy_queue)) { | ||
121 | b = list_entry(q_ctx->rdy_queue.next, struct v4l2_m2m_buffer, | ||
122 | list); | ||
123 | list_del(&b->list); | ||
124 | q_ctx->num_rdy--; | ||
125 | } | ||
126 | spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags); | ||
127 | |||
128 | return &b->vb; | ||
129 | } | ||
130 | EXPORT_SYMBOL_GPL(v4l2_m2m_buf_remove); | ||
131 | |||
132 | /* | ||
133 | * Scheduling handlers | ||
134 | */ | ||
135 | |||
136 | /** | ||
137 | * v4l2_m2m_get_curr_priv() - return driver private data for the currently | ||
138 | * running instance or NULL if no instance is running | ||
139 | */ | ||
140 | void *v4l2_m2m_get_curr_priv(struct v4l2_m2m_dev *m2m_dev) | ||
141 | { | ||
142 | unsigned long flags; | ||
143 | void *ret = NULL; | ||
144 | |||
145 | spin_lock_irqsave(&m2m_dev->job_spinlock, flags); | ||
146 | if (m2m_dev->curr_ctx) | ||
147 | ret = m2m_dev->curr_ctx->priv; | ||
148 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | ||
149 | |||
150 | return ret; | ||
151 | } | ||
152 | EXPORT_SYMBOL(v4l2_m2m_get_curr_priv); | ||
153 | |||
154 | /** | ||
155 | * v4l2_m2m_try_run() - select next job to perform and run it if possible | ||
156 | * | ||
157 | * Get next transaction (if present) from the waiting jobs list and run it. | ||
158 | */ | ||
159 | static void v4l2_m2m_try_run(struct v4l2_m2m_dev *m2m_dev) | ||
160 | { | ||
161 | unsigned long flags; | ||
162 | |||
163 | spin_lock_irqsave(&m2m_dev->job_spinlock, flags); | ||
164 | if (NULL != m2m_dev->curr_ctx) { | ||
165 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | ||
166 | dprintk("Another instance is running, won't run now\n"); | ||
167 | return; | ||
168 | } | ||
169 | |||
170 | if (list_empty(&m2m_dev->job_queue)) { | ||
171 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | ||
172 | dprintk("No job pending\n"); | ||
173 | return; | ||
174 | } | ||
175 | |||
176 | m2m_dev->curr_ctx = list_entry(m2m_dev->job_queue.next, | ||
177 | struct v4l2_m2m_ctx, queue); | ||
178 | m2m_dev->curr_ctx->job_flags |= TRANS_RUNNING; | ||
179 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | ||
180 | |||
181 | m2m_dev->m2m_ops->device_run(m2m_dev->curr_ctx->priv); | ||
182 | } | ||
183 | |||
184 | /** | ||
185 | * v4l2_m2m_try_schedule() - check whether an instance is ready to be added to | ||
186 | * the pending job queue and add it if so. | ||
187 | * @m2m_ctx: m2m context assigned to the instance to be checked | ||
188 | * | ||
189 | * There are three basic requirements an instance has to meet to be able to run: | ||
190 | * 1) at least one source buffer has to be queued, | ||
191 | * 2) at least one destination buffer has to be queued, | ||
192 | * 3) streaming has to be on. | ||
193 | * | ||
194 | * There may also be additional, custom requirements. In such case the driver | ||
195 | * should supply a custom callback (job_ready in v4l2_m2m_ops) that should | ||
196 | * return 1 if the instance is ready. | ||
197 | * An example of the above could be an instance that requires more than one | ||
198 | * src/dst buffer per transaction. | ||
199 | */ | ||
200 | static void v4l2_m2m_try_schedule(struct v4l2_m2m_ctx *m2m_ctx) | ||
201 | { | ||
202 | struct v4l2_m2m_dev *m2m_dev; | ||
203 | unsigned long flags_job, flags; | ||
204 | |||
205 | m2m_dev = m2m_ctx->m2m_dev; | ||
206 | dprintk("Trying to schedule a job for m2m_ctx: %p\n", m2m_ctx); | ||
207 | |||
208 | if (!m2m_ctx->out_q_ctx.q.streaming | ||
209 | || !m2m_ctx->cap_q_ctx.q.streaming) { | ||
210 | dprintk("Streaming needs to be on for both queues\n"); | ||
211 | return; | ||
212 | } | ||
213 | |||
214 | spin_lock_irqsave(&m2m_dev->job_spinlock, flags_job); | ||
215 | if (m2m_ctx->job_flags & TRANS_QUEUED) { | ||
216 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job); | ||
217 | dprintk("On job queue already\n"); | ||
218 | return; | ||
219 | } | ||
220 | |||
221 | spin_lock_irqsave(&m2m_ctx->out_q_ctx.rdy_spinlock, flags); | ||
222 | if (list_empty(&m2m_ctx->out_q_ctx.rdy_queue)) { | ||
223 | spin_unlock_irqrestore(&m2m_ctx->out_q_ctx.rdy_spinlock, flags); | ||
224 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job); | ||
225 | dprintk("No input buffers available\n"); | ||
226 | return; | ||
227 | } | ||
228 | if (list_empty(&m2m_ctx->cap_q_ctx.rdy_queue)) { | ||
229 | spin_unlock_irqrestore(&m2m_ctx->out_q_ctx.rdy_spinlock, flags); | ||
230 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job); | ||
231 | dprintk("No output buffers available\n"); | ||
232 | return; | ||
233 | } | ||
234 | spin_unlock_irqrestore(&m2m_ctx->out_q_ctx.rdy_spinlock, flags); | ||
235 | |||
236 | if (m2m_dev->m2m_ops->job_ready | ||
237 | && (!m2m_dev->m2m_ops->job_ready(m2m_ctx->priv))) { | ||
238 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job); | ||
239 | dprintk("Driver not ready\n"); | ||
240 | return; | ||
241 | } | ||
242 | |||
243 | list_add_tail(&m2m_ctx->queue, &m2m_dev->job_queue); | ||
244 | m2m_ctx->job_flags |= TRANS_QUEUED; | ||
245 | |||
246 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job); | ||
247 | |||
248 | v4l2_m2m_try_run(m2m_dev); | ||
249 | } | ||
250 | |||
251 | /** | ||
252 | * v4l2_m2m_job_finish() - inform the framework that a job has been finished | ||
253 | * and have it clean up | ||
254 | * | ||
255 | * Called by a driver to yield back the device after it has finished with it. | ||
256 | * Should be called as soon as possible after reaching a state which allows | ||
257 | * other instances to take control of the device. | ||
258 | * | ||
259 | * This function has to be called only after device_run() callback has been | ||
260 | * called on the driver. To prevent recursion, it should not be called directly | ||
261 | * from the device_run() callback though. | ||
262 | */ | ||
263 | void v4l2_m2m_job_finish(struct v4l2_m2m_dev *m2m_dev, | ||
264 | struct v4l2_m2m_ctx *m2m_ctx) | ||
265 | { | ||
266 | unsigned long flags; | ||
267 | |||
268 | spin_lock_irqsave(&m2m_dev->job_spinlock, flags); | ||
269 | if (!m2m_dev->curr_ctx || m2m_dev->curr_ctx != m2m_ctx) { | ||
270 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | ||
271 | dprintk("Called by an instance not currently running\n"); | ||
272 | return; | ||
273 | } | ||
274 | |||
275 | list_del(&m2m_dev->curr_ctx->queue); | ||
276 | m2m_dev->curr_ctx->job_flags &= ~(TRANS_QUEUED | TRANS_RUNNING); | ||
277 | wake_up(&m2m_dev->curr_ctx->finished); | ||
278 | m2m_dev->curr_ctx = NULL; | ||
279 | |||
280 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | ||
281 | |||
282 | /* This instance might have more buffers ready, but since we do not | ||
283 | * allow more than one job on the job_queue per instance, each has | ||
284 | * to be scheduled separately after the previous one finishes. */ | ||
285 | v4l2_m2m_try_schedule(m2m_ctx); | ||
286 | v4l2_m2m_try_run(m2m_dev); | ||
287 | } | ||
288 | EXPORT_SYMBOL(v4l2_m2m_job_finish); | ||
289 | |||
290 | /** | ||
291 | * v4l2_m2m_reqbufs() - multi-queue-aware REQBUFS multiplexer | ||
292 | */ | ||
293 | int v4l2_m2m_reqbufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | ||
294 | struct v4l2_requestbuffers *reqbufs) | ||
295 | { | ||
296 | struct vb2_queue *vq; | ||
297 | |||
298 | vq = v4l2_m2m_get_vq(m2m_ctx, reqbufs->type); | ||
299 | return vb2_reqbufs(vq, reqbufs); | ||
300 | } | ||
301 | EXPORT_SYMBOL_GPL(v4l2_m2m_reqbufs); | ||
302 | |||
303 | /** | ||
304 | * v4l2_m2m_querybuf() - multi-queue-aware QUERYBUF multiplexer | ||
305 | * | ||
306 | * See v4l2_m2m_mmap() documentation for details. | ||
307 | */ | ||
308 | int v4l2_m2m_querybuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | ||
309 | struct v4l2_buffer *buf) | ||
310 | { | ||
311 | struct vb2_queue *vq; | ||
312 | int ret = 0; | ||
313 | unsigned int i; | ||
314 | |||
315 | vq = v4l2_m2m_get_vq(m2m_ctx, buf->type); | ||
316 | ret = vb2_querybuf(vq, buf); | ||
317 | |||
318 | /* Adjust MMAP memory offsets for the CAPTURE queue */ | ||
319 | if (buf->memory == V4L2_MEMORY_MMAP && !V4L2_TYPE_IS_OUTPUT(vq->type)) { | ||
320 | if (V4L2_TYPE_IS_MULTIPLANAR(vq->type)) { | ||
321 | for (i = 0; i < buf->length; ++i) | ||
322 | buf->m.planes[i].m.mem_offset | ||
323 | += DST_QUEUE_OFF_BASE; | ||
324 | } else { | ||
325 | buf->m.offset += DST_QUEUE_OFF_BASE; | ||
326 | } | ||
327 | } | ||
328 | |||
329 | return ret; | ||
330 | } | ||
331 | EXPORT_SYMBOL_GPL(v4l2_m2m_querybuf); | ||
332 | |||
333 | /** | ||
334 | * v4l2_m2m_qbuf() - enqueue a source or destination buffer, depending on | ||
335 | * the type | ||
336 | */ | ||
337 | int v4l2_m2m_qbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | ||
338 | struct v4l2_buffer *buf) | ||
339 | { | ||
340 | struct vb2_queue *vq; | ||
341 | int ret; | ||
342 | |||
343 | vq = v4l2_m2m_get_vq(m2m_ctx, buf->type); | ||
344 | ret = vb2_qbuf(vq, buf); | ||
345 | if (!ret) | ||
346 | v4l2_m2m_try_schedule(m2m_ctx); | ||
347 | |||
348 | return ret; | ||
349 | } | ||
350 | EXPORT_SYMBOL_GPL(v4l2_m2m_qbuf); | ||
351 | |||
352 | /** | ||
353 | * v4l2_m2m_dqbuf() - dequeue a source or destination buffer, depending on | ||
354 | * the type | ||
355 | */ | ||
356 | int v4l2_m2m_dqbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | ||
357 | struct v4l2_buffer *buf) | ||
358 | { | ||
359 | struct vb2_queue *vq; | ||
360 | |||
361 | vq = v4l2_m2m_get_vq(m2m_ctx, buf->type); | ||
362 | return vb2_dqbuf(vq, buf, file->f_flags & O_NONBLOCK); | ||
363 | } | ||
364 | EXPORT_SYMBOL_GPL(v4l2_m2m_dqbuf); | ||
365 | |||
366 | /** | ||
367 | * v4l2_m2m_streamon() - turn on streaming for a video queue | ||
368 | */ | ||
369 | int v4l2_m2m_streamon(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | ||
370 | enum v4l2_buf_type type) | ||
371 | { | ||
372 | struct vb2_queue *vq; | ||
373 | int ret; | ||
374 | |||
375 | vq = v4l2_m2m_get_vq(m2m_ctx, type); | ||
376 | ret = vb2_streamon(vq, type); | ||
377 | if (!ret) | ||
378 | v4l2_m2m_try_schedule(m2m_ctx); | ||
379 | |||
380 | return ret; | ||
381 | } | ||
382 | EXPORT_SYMBOL_GPL(v4l2_m2m_streamon); | ||
383 | |||
384 | /** | ||
385 | * v4l2_m2m_streamoff() - turn off streaming for a video queue | ||
386 | */ | ||
387 | int v4l2_m2m_streamoff(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | ||
388 | enum v4l2_buf_type type) | ||
389 | { | ||
390 | struct vb2_queue *vq; | ||
391 | |||
392 | vq = v4l2_m2m_get_vq(m2m_ctx, type); | ||
393 | return vb2_streamoff(vq, type); | ||
394 | } | ||
395 | EXPORT_SYMBOL_GPL(v4l2_m2m_streamoff); | ||
396 | |||
397 | /** | ||
398 | * v4l2_m2m_poll() - poll replacement, for destination buffers only | ||
399 | * | ||
400 | * Call from the driver's poll() function. Will poll both queues. If a buffer | ||
401 | * is available to dequeue (with dqbuf) from the source queue, this will | ||
402 | * indicate that a non-blocking write can be performed, while read will be | ||
403 | * returned in case of the destination queue. | ||
404 | */ | ||
405 | unsigned int v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | ||
406 | struct poll_table_struct *wait) | ||
407 | { | ||
408 | struct vb2_queue *src_q, *dst_q; | ||
409 | struct vb2_buffer *src_vb = NULL, *dst_vb = NULL; | ||
410 | unsigned int rc = 0; | ||
411 | unsigned long flags; | ||
412 | |||
413 | src_q = v4l2_m2m_get_src_vq(m2m_ctx); | ||
414 | dst_q = v4l2_m2m_get_dst_vq(m2m_ctx); | ||
415 | |||
416 | /* | ||
417 | * There has to be at least one buffer queued on each queued_list, which | ||
418 | * means either in driver already or waiting for driver to claim it | ||
419 | * and start processing. | ||
420 | */ | ||
421 | if ((!src_q->streaming || list_empty(&src_q->queued_list)) | ||
422 | && (!dst_q->streaming || list_empty(&dst_q->queued_list))) { | ||
423 | rc = POLLERR; | ||
424 | goto end; | ||
425 | } | ||
426 | |||
427 | if (m2m_ctx->m2m_dev->m2m_ops->unlock) | ||
428 | m2m_ctx->m2m_dev->m2m_ops->unlock(m2m_ctx->priv); | ||
429 | |||
430 | poll_wait(file, &src_q->done_wq, wait); | ||
431 | poll_wait(file, &dst_q->done_wq, wait); | ||
432 | |||
433 | if (m2m_ctx->m2m_dev->m2m_ops->lock) | ||
434 | m2m_ctx->m2m_dev->m2m_ops->lock(m2m_ctx->priv); | ||
435 | |||
436 | spin_lock_irqsave(&src_q->done_lock, flags); | ||
437 | if (!list_empty(&src_q->done_list)) | ||
438 | src_vb = list_first_entry(&src_q->done_list, struct vb2_buffer, | ||
439 | done_entry); | ||
440 | if (src_vb && (src_vb->state == VB2_BUF_STATE_DONE | ||
441 | || src_vb->state == VB2_BUF_STATE_ERROR)) | ||
442 | rc |= POLLOUT | POLLWRNORM; | ||
443 | spin_unlock_irqrestore(&src_q->done_lock, flags); | ||
444 | |||
445 | spin_lock_irqsave(&dst_q->done_lock, flags); | ||
446 | if (!list_empty(&dst_q->done_list)) | ||
447 | dst_vb = list_first_entry(&dst_q->done_list, struct vb2_buffer, | ||
448 | done_entry); | ||
449 | if (dst_vb && (dst_vb->state == VB2_BUF_STATE_DONE | ||
450 | || dst_vb->state == VB2_BUF_STATE_ERROR)) | ||
451 | rc |= POLLIN | POLLRDNORM; | ||
452 | spin_unlock_irqrestore(&dst_q->done_lock, flags); | ||
453 | |||
454 | end: | ||
455 | return rc; | ||
456 | } | ||
457 | EXPORT_SYMBOL_GPL(v4l2_m2m_poll); | ||
458 | |||
459 | /** | ||
460 | * v4l2_m2m_mmap() - source and destination queues-aware mmap multiplexer | ||
461 | * | ||
462 | * Call from driver's mmap() function. Will handle mmap() for both queues | ||
463 | * seamlessly for videobuffer, which will receive normal per-queue offsets and | ||
464 | * proper videobuf queue pointers. The differentiation is made outside videobuf | ||
465 | * by adding a predefined offset to buffers from one of the queues and | ||
466 | * subtracting it before passing it back to videobuf. Only drivers (and | ||
467 | * thus applications) receive modified offsets. | ||
468 | */ | ||
469 | int v4l2_m2m_mmap(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | ||
470 | struct vm_area_struct *vma) | ||
471 | { | ||
472 | unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; | ||
473 | struct vb2_queue *vq; | ||
474 | |||
475 | if (offset < DST_QUEUE_OFF_BASE) { | ||
476 | vq = v4l2_m2m_get_src_vq(m2m_ctx); | ||
477 | } else { | ||
478 | vq = v4l2_m2m_get_dst_vq(m2m_ctx); | ||
479 | vma->vm_pgoff -= (DST_QUEUE_OFF_BASE >> PAGE_SHIFT); | ||
480 | } | ||
481 | |||
482 | return vb2_mmap(vq, vma); | ||
483 | } | ||
484 | EXPORT_SYMBOL(v4l2_m2m_mmap); | ||
485 | |||
486 | /** | ||
487 | * v4l2_m2m_init() - initialize per-driver m2m data | ||
488 | * | ||
489 | * Usually called from driver's probe() function. | ||
490 | */ | ||
491 | struct v4l2_m2m_dev *v4l2_m2m_init(struct v4l2_m2m_ops *m2m_ops) | ||
492 | { | ||
493 | struct v4l2_m2m_dev *m2m_dev; | ||
494 | |||
495 | if (!m2m_ops) | ||
496 | return ERR_PTR(-EINVAL); | ||
497 | |||
498 | BUG_ON(!m2m_ops->device_run); | ||
499 | BUG_ON(!m2m_ops->job_abort); | ||
500 | |||
501 | m2m_dev = kzalloc(sizeof *m2m_dev, GFP_KERNEL); | ||
502 | if (!m2m_dev) | ||
503 | return ERR_PTR(-ENOMEM); | ||
504 | |||
505 | m2m_dev->curr_ctx = NULL; | ||
506 | m2m_dev->m2m_ops = m2m_ops; | ||
507 | INIT_LIST_HEAD(&m2m_dev->job_queue); | ||
508 | spin_lock_init(&m2m_dev->job_spinlock); | ||
509 | |||
510 | return m2m_dev; | ||
511 | } | ||
512 | EXPORT_SYMBOL_GPL(v4l2_m2m_init); | ||
513 | |||
514 | /** | ||
515 | * v4l2_m2m_release() - cleans up and frees a m2m_dev structure | ||
516 | * | ||
517 | * Usually called from driver's remove() function. | ||
518 | */ | ||
519 | void v4l2_m2m_release(struct v4l2_m2m_dev *m2m_dev) | ||
520 | { | ||
521 | kfree(m2m_dev); | ||
522 | } | ||
523 | EXPORT_SYMBOL_GPL(v4l2_m2m_release); | ||
524 | |||
525 | /** | ||
526 | * v4l2_m2m_ctx_init() - allocate and initialize a m2m context | ||
527 | * @priv - driver's instance private data | ||
528 | * @m2m_dev - a previously initialized m2m_dev struct | ||
529 | * @vq_init - a callback for queue type-specific initialization function to be | ||
530 | * used for initializing videobuf_queues | ||
531 | * | ||
532 | * Usually called from driver's open() function. | ||
533 | */ | ||
534 | struct v4l2_m2m_ctx *v4l2_m2m_ctx_init(struct v4l2_m2m_dev *m2m_dev, | ||
535 | void *drv_priv, | ||
536 | int (*queue_init)(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq)) | ||
537 | { | ||
538 | struct v4l2_m2m_ctx *m2m_ctx; | ||
539 | struct v4l2_m2m_queue_ctx *out_q_ctx, *cap_q_ctx; | ||
540 | int ret; | ||
541 | |||
542 | m2m_ctx = kzalloc(sizeof *m2m_ctx, GFP_KERNEL); | ||
543 | if (!m2m_ctx) | ||
544 | return ERR_PTR(-ENOMEM); | ||
545 | |||
546 | m2m_ctx->priv = drv_priv; | ||
547 | m2m_ctx->m2m_dev = m2m_dev; | ||
548 | init_waitqueue_head(&m2m_ctx->finished); | ||
549 | |||
550 | out_q_ctx = &m2m_ctx->out_q_ctx; | ||
551 | cap_q_ctx = &m2m_ctx->cap_q_ctx; | ||
552 | |||
553 | INIT_LIST_HEAD(&out_q_ctx->rdy_queue); | ||
554 | INIT_LIST_HEAD(&cap_q_ctx->rdy_queue); | ||
555 | spin_lock_init(&out_q_ctx->rdy_spinlock); | ||
556 | spin_lock_init(&cap_q_ctx->rdy_spinlock); | ||
557 | |||
558 | INIT_LIST_HEAD(&m2m_ctx->queue); | ||
559 | |||
560 | ret = queue_init(drv_priv, &out_q_ctx->q, &cap_q_ctx->q); | ||
561 | |||
562 | if (ret) | ||
563 | goto err; | ||
564 | |||
565 | return m2m_ctx; | ||
566 | err: | ||
567 | kfree(m2m_ctx); | ||
568 | return ERR_PTR(ret); | ||
569 | } | ||
570 | EXPORT_SYMBOL_GPL(v4l2_m2m_ctx_init); | ||
571 | |||
572 | /** | ||
573 | * v4l2_m2m_ctx_release() - release m2m context | ||
574 | * | ||
575 | * Usually called from driver's release() function. | ||
576 | */ | ||
577 | void v4l2_m2m_ctx_release(struct v4l2_m2m_ctx *m2m_ctx) | ||
578 | { | ||
579 | struct v4l2_m2m_dev *m2m_dev; | ||
580 | unsigned long flags; | ||
581 | |||
582 | m2m_dev = m2m_ctx->m2m_dev; | ||
583 | |||
584 | spin_lock_irqsave(&m2m_dev->job_spinlock, flags); | ||
585 | if (m2m_ctx->job_flags & TRANS_RUNNING) { | ||
586 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | ||
587 | m2m_dev->m2m_ops->job_abort(m2m_ctx->priv); | ||
588 | dprintk("m2m_ctx %p running, will wait to complete", m2m_ctx); | ||
589 | wait_event(m2m_ctx->finished, !(m2m_ctx->job_flags & TRANS_RUNNING)); | ||
590 | } else if (m2m_ctx->job_flags & TRANS_QUEUED) { | ||
591 | list_del(&m2m_ctx->queue); | ||
592 | m2m_ctx->job_flags &= ~(TRANS_QUEUED | TRANS_RUNNING); | ||
593 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | ||
594 | dprintk("m2m_ctx: %p had been on queue and was removed\n", | ||
595 | m2m_ctx); | ||
596 | } else { | ||
597 | /* Do nothing, was not on queue/running */ | ||
598 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | ||
599 | } | ||
600 | |||
601 | vb2_queue_release(&m2m_ctx->cap_q_ctx.q); | ||
602 | vb2_queue_release(&m2m_ctx->out_q_ctx.q); | ||
603 | |||
604 | kfree(m2m_ctx); | ||
605 | } | ||
606 | EXPORT_SYMBOL_GPL(v4l2_m2m_ctx_release); | ||
607 | |||
608 | /** | ||
609 | * v4l2_m2m_buf_queue() - add a buffer to the proper ready buffers list. | ||
610 | * | ||
611 | * Call from buf_queue(), videobuf_queue_ops callback. | ||
612 | */ | ||
613 | void v4l2_m2m_buf_queue(struct v4l2_m2m_ctx *m2m_ctx, struct vb2_buffer *vb) | ||
614 | { | ||
615 | struct v4l2_m2m_buffer *b = container_of(vb, struct v4l2_m2m_buffer, vb); | ||
616 | struct v4l2_m2m_queue_ctx *q_ctx; | ||
617 | unsigned long flags; | ||
618 | |||
619 | q_ctx = get_queue_ctx(m2m_ctx, vb->vb2_queue->type); | ||
620 | if (!q_ctx) | ||
621 | return; | ||
622 | |||
623 | spin_lock_irqsave(&q_ctx->rdy_spinlock, flags); | ||
624 | list_add_tail(&b->list, &q_ctx->rdy_queue); | ||
625 | q_ctx->num_rdy++; | ||
626 | spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags); | ||
627 | } | ||
628 | EXPORT_SYMBOL_GPL(v4l2_m2m_buf_queue); | ||
629 | |||