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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. | |
8 | * Pawel Osciak, <p.osciak@samsung.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 | ||
908a0d7c | 20 | #include <media/videobuf2-core.h> |
7f98639d PO |
21 | #include <media/v4l2-mem2mem.h> |
22 | ||
23 | MODULE_DESCRIPTION("Mem to mem device framework for videobuf"); | |
24 | MODULE_AUTHOR("Pawel Osciak, <p.osciak@samsung.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 | { | |
908a0d7c | 68 | if (V4L2_TYPE_IS_OUTPUT(type)) |
7f98639d | 69 | return &m2m_ctx->out_q_ctx; |
908a0d7c MS |
70 | else |
71 | return &m2m_ctx->cap_q_ctx; | |
7f98639d PO |
72 | } |
73 | ||
74 | /** | |
908a0d7c | 75 | * v4l2_m2m_get_vq() - return vb2_queue for the given type |
7f98639d | 76 | */ |
908a0d7c | 77 | struct vb2_queue *v4l2_m2m_get_vq(struct v4l2_m2m_ctx *m2m_ctx, |
7f98639d PO |
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 | */ | |
908a0d7c | 93 | void *v4l2_m2m_next_buf(struct v4l2_m2m_queue_ctx *q_ctx) |
7f98639d | 94 | { |
908a0d7c | 95 | struct v4l2_m2m_buffer *b = NULL; |
7f98639d PO |
96 | unsigned long flags; |
97 | ||
908a0d7c | 98 | spin_lock_irqsave(&q_ctx->rdy_spinlock, flags); |
7f98639d PO |
99 | |
100 | if (list_empty(&q_ctx->rdy_queue)) | |
101 | goto end; | |
102 | ||
908a0d7c | 103 | b = list_entry(q_ctx->rdy_queue.next, struct v4l2_m2m_buffer, list); |
7f98639d | 104 | end: |
908a0d7c MS |
105 | spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags); |
106 | return &b->vb; | |
7f98639d PO |
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 | */ | |
908a0d7c | 114 | void *v4l2_m2m_buf_remove(struct v4l2_m2m_queue_ctx *q_ctx) |
7f98639d | 115 | { |
908a0d7c | 116 | struct v4l2_m2m_buffer *b = NULL; |
7f98639d PO |
117 | unsigned long flags; |
118 | ||
908a0d7c | 119 | spin_lock_irqsave(&q_ctx->rdy_spinlock, flags); |
7f98639d | 120 | if (!list_empty(&q_ctx->rdy_queue)) { |
908a0d7c MS |
121 | b = list_entry(q_ctx->rdy_queue.next, struct v4l2_m2m_buffer, |
122 | list); | |
123 | list_del(&b->list); | |
7f98639d PO |
124 | q_ctx->num_rdy--; |
125 | } | |
908a0d7c | 126 | spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags); |
7f98639d | 127 | |
908a0d7c | 128 | return &b->vb; |
7f98639d PO |
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 | ||
908a0d7c | 221 | spin_lock_irqsave(&m2m_ctx->out_q_ctx.rdy_spinlock, flags); |
7f98639d | 222 | if (list_empty(&m2m_ctx->out_q_ctx.rdy_queue)) { |
908a0d7c | 223 | spin_unlock_irqrestore(&m2m_ctx->out_q_ctx.rdy_spinlock, flags); |
7f98639d PO |
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)) { | |
908a0d7c | 229 | spin_unlock_irqrestore(&m2m_ctx->out_q_ctx.rdy_spinlock, flags); |
7f98639d PO |
230 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job); |
231 | dprintk("No output buffers available\n"); | |
232 | return; | |
233 | } | |
908a0d7c | 234 | spin_unlock_irqrestore(&m2m_ctx->out_q_ctx.rdy_spinlock, flags); |
7f98639d PO |
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); | |
908a0d7c | 277 | wake_up(&m2m_dev->curr_ctx->finished); |
7f98639d PO |
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 | { | |
908a0d7c | 296 | struct vb2_queue *vq; |
7f98639d PO |
297 | |
298 | vq = v4l2_m2m_get_vq(m2m_ctx, reqbufs->type); | |
908a0d7c | 299 | return vb2_reqbufs(vq, reqbufs); |
7f98639d PO |
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 | { | |
908a0d7c MS |
311 | struct vb2_queue *vq; |
312 | int ret = 0; | |
313 | unsigned int i; | |
7f98639d PO |
314 | |
315 | vq = v4l2_m2m_get_vq(m2m_ctx, buf->type); | |
908a0d7c MS |
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 | } | |
7f98639d PO |
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 | { | |
908a0d7c | 340 | struct vb2_queue *vq; |
7f98639d PO |
341 | int ret; |
342 | ||
343 | vq = v4l2_m2m_get_vq(m2m_ctx, buf->type); | |
908a0d7c | 344 | ret = vb2_qbuf(vq, buf); |
7f98639d PO |
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 | { | |
908a0d7c | 359 | struct vb2_queue *vq; |
7f98639d PO |
360 | |
361 | vq = v4l2_m2m_get_vq(m2m_ctx, buf->type); | |
908a0d7c | 362 | return vb2_dqbuf(vq, buf, file->f_flags & O_NONBLOCK); |
7f98639d PO |
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 | { | |
908a0d7c | 372 | struct vb2_queue *vq; |
7f98639d PO |
373 | int ret; |
374 | ||
375 | vq = v4l2_m2m_get_vq(m2m_ctx, type); | |
908a0d7c | 376 | ret = vb2_streamon(vq, type); |
7f98639d PO |
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 | { | |
908a0d7c | 390 | struct vb2_queue *vq; |
7f98639d PO |
391 | |
392 | vq = v4l2_m2m_get_vq(m2m_ctx, type); | |
908a0d7c | 393 | return vb2_streamoff(vq, type); |
7f98639d PO |
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 | { | |
908a0d7c MS |
408 | struct vb2_queue *src_q, *dst_q; |
409 | struct vb2_buffer *src_vb = NULL, *dst_vb = NULL; | |
7f98639d | 410 | unsigned int rc = 0; |
908a0d7c | 411 | unsigned long flags; |
7f98639d PO |
412 | |
413 | src_q = v4l2_m2m_get_src_vq(m2m_ctx); | |
414 | dst_q = v4l2_m2m_get_dst_vq(m2m_ctx); | |
415 | ||
908a0d7c MS |
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))) { | |
7f98639d PO |
423 | rc = POLLERR; |
424 | goto end; | |
425 | } | |
426 | ||
908a0d7c MS |
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); | |
7f98639d PO |
453 | |
454 | end: | |
7f98639d PO |
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; | |
908a0d7c | 473 | struct vb2_queue *vq; |
7f98639d PO |
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 | ||
908a0d7c | 482 | return vb2_mmap(vq, vma); |
7f98639d PO |
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 | */ | |
908a0d7c MS |
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)) | |
7f98639d PO |
537 | { |
538 | struct v4l2_m2m_ctx *m2m_ctx; | |
539 | struct v4l2_m2m_queue_ctx *out_q_ctx, *cap_q_ctx; | |
908a0d7c | 540 | int ret; |
7f98639d PO |
541 | |
542 | m2m_ctx = kzalloc(sizeof *m2m_ctx, GFP_KERNEL); | |
543 | if (!m2m_ctx) | |
544 | return ERR_PTR(-ENOMEM); | |
545 | ||
908a0d7c | 546 | m2m_ctx->priv = drv_priv; |
7f98639d | 547 | m2m_ctx->m2m_dev = m2m_dev; |
908a0d7c | 548 | init_waitqueue_head(&m2m_ctx->finished); |
7f98639d | 549 | |
908a0d7c MS |
550 | out_q_ctx = &m2m_ctx->out_q_ctx; |
551 | cap_q_ctx = &m2m_ctx->cap_q_ctx; | |
7f98639d PO |
552 | |
553 | INIT_LIST_HEAD(&out_q_ctx->rdy_queue); | |
554 | INIT_LIST_HEAD(&cap_q_ctx->rdy_queue); | |
908a0d7c MS |
555 | spin_lock_init(&out_q_ctx->rdy_spinlock); |
556 | spin_lock_init(&cap_q_ctx->rdy_spinlock); | |
7f98639d PO |
557 | |
558 | INIT_LIST_HEAD(&m2m_ctx->queue); | |
559 | ||
908a0d7c MS |
560 | ret = queue_init(drv_priv, &out_q_ctx->q, &cap_q_ctx->q); |
561 | ||
562 | if (ret) | |
563 | goto err; | |
7f98639d PO |
564 | |
565 | return m2m_ctx; | |
908a0d7c MS |
566 | err: |
567 | kfree(m2m_ctx); | |
568 | return ERR_PTR(ret); | |
7f98639d PO |
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; | |
7f98639d PO |
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); | |
908a0d7c | 589 | wait_event(m2m_ctx->finished, !(m2m_ctx->job_flags & TRANS_RUNNING)); |
7f98639d PO |
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 | ||
908a0d7c MS |
601 | vb2_queue_release(&m2m_ctx->cap_q_ctx.q); |
602 | vb2_queue_release(&m2m_ctx->out_q_ctx.q); | |
7f98639d PO |
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. | |
7f98639d | 612 | */ |
908a0d7c | 613 | void v4l2_m2m_buf_queue(struct v4l2_m2m_ctx *m2m_ctx, struct vb2_buffer *vb) |
7f98639d | 614 | { |
908a0d7c | 615 | struct v4l2_m2m_buffer *b = container_of(vb, struct v4l2_m2m_buffer, vb); |
7f98639d | 616 | struct v4l2_m2m_queue_ctx *q_ctx; |
908a0d7c | 617 | unsigned long flags; |
7f98639d | 618 | |
908a0d7c | 619 | q_ctx = get_queue_ctx(m2m_ctx, vb->vb2_queue->type); |
7f98639d PO |
620 | if (!q_ctx) |
621 | return; | |
622 | ||
908a0d7c MS |
623 | spin_lock_irqsave(&q_ctx->rdy_spinlock, flags); |
624 | list_add_tail(&b->list, &q_ctx->rdy_queue); | |
7f98639d | 625 | q_ctx->num_rdy++; |
908a0d7c | 626 | spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags); |
7f98639d PO |
627 | } |
628 | EXPORT_SYMBOL_GPL(v4l2_m2m_buf_queue); | |
629 |