xref: /linux/drivers/media/dvb-core/dvb_vb2.c (revision 021bc4b9) 
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * dvb-vb2.c - dvb-vb2
4  *
5  * Copyright (C) 2015 Samsung Electronics
6  *
7  * Author: jh1009.sung@samsung.com
8  */
9 
10 #include <linux/err.h>
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/mm.h>
14 
15 #include <media/dvbdev.h>
16 #include <media/dvb_vb2.h>
17 
18 #define DVB_V2_MAX_SIZE		(4096 * 188)
19 
20 static int vb2_debug;
21 module_param(vb2_debug, int, 0644);
22 
23 #define dprintk(level, fmt, arg...)					      \
24 	do {								      \
25 		if (vb2_debug >= level)					      \
26 			pr_info("vb2: %s: " fmt, __func__, ## arg); \
27 	} while (0)
28 
29 static int _queue_setup(struct vb2_queue *vq,
30 			unsigned int *nbuffers, unsigned int *nplanes,
31 			unsigned int sizes[], struct device *alloc_devs[])
32 {
33 	struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vq);
34 
35 	ctx->buf_cnt = *nbuffers;
36 	*nplanes = 1;
37 	sizes[0] = ctx->buf_siz;
38 
39 	/*
40 	 * videobuf2-vmalloc allocator is context-less so no need to set
41 	 * alloc_ctxs array.
42 	 */
43 
44 	dprintk(3, "[%s] count=%d, size=%d\n", ctx->name,
45 		*nbuffers, sizes[0]);
46 
47 	return 0;
48 }
49 
50 static int _buffer_prepare(struct vb2_buffer *vb)
51 {
52 	struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
53 	unsigned long size = ctx->buf_siz;
54 
55 	if (vb2_plane_size(vb, 0) < size) {
56 		dprintk(1, "[%s] data will not fit into plane (%lu < %lu)\n",
57 			ctx->name, vb2_plane_size(vb, 0), size);
58 		return -EINVAL;
59 	}
60 
61 	vb2_set_plane_payload(vb, 0, size);
62 	dprintk(3, "[%s]\n", ctx->name);
63 
64 	return 0;
65 }
66 
67 static void _buffer_queue(struct vb2_buffer *vb)
68 {
69 	struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
70 	struct dvb_buffer *buf = container_of(vb, struct dvb_buffer, vb);
71 	unsigned long flags = 0;
72 
73 	spin_lock_irqsave(&ctx->slock, flags);
74 	list_add_tail(&buf->list, &ctx->dvb_q);
75 	spin_unlock_irqrestore(&ctx->slock, flags);
76 
77 	dprintk(3, "[%s]\n", ctx->name);
78 }
79 
80 static int _start_streaming(struct vb2_queue *vq, unsigned int count)
81 {
82 	struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vq);
83 
84 	dprintk(3, "[%s] count=%d\n", ctx->name, count);
85 	return 0;
86 }
87 
88 static void _stop_streaming(struct vb2_queue *vq)
89 {
90 	struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vq);
91 	struct dvb_buffer *buf;
92 	unsigned long flags = 0;
93 
94 	dprintk(3, "[%s]\n", ctx->name);
95 
96 	spin_lock_irqsave(&ctx->slock, flags);
97 	while (!list_empty(&ctx->dvb_q)) {
98 		buf = list_entry(ctx->dvb_q.next,
99 				 struct dvb_buffer, list);
100 		vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
101 		list_del(&buf->list);
102 	}
103 	spin_unlock_irqrestore(&ctx->slock, flags);
104 }
105 
106 static void _dmxdev_lock(struct vb2_queue *vq)
107 {
108 	struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vq);
109 
110 	mutex_lock(&ctx->mutex);
111 	dprintk(3, "[%s]\n", ctx->name);
112 }
113 
114 static void _dmxdev_unlock(struct vb2_queue *vq)
115 {
116 	struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vq);
117 
118 	if (mutex_is_locked(&ctx->mutex))
119 		mutex_unlock(&ctx->mutex);
120 	dprintk(3, "[%s]\n", ctx->name);
121 }
122 
123 static const struct vb2_ops dvb_vb2_qops = {
124 	.queue_setup		= _queue_setup,
125 	.buf_prepare		= _buffer_prepare,
126 	.buf_queue		= _buffer_queue,
127 	.start_streaming	= _start_streaming,
128 	.stop_streaming		= _stop_streaming,
129 	.wait_prepare		= _dmxdev_unlock,
130 	.wait_finish		= _dmxdev_lock,
131 };
132 
133 static void _fill_dmx_buffer(struct vb2_buffer *vb, void *pb)
134 {
135 	struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
136 	struct dmx_buffer *b = pb;
137 
138 	b->index = vb->index;
139 	b->length = vb->planes[0].length;
140 	b->bytesused = vb->planes[0].bytesused;
141 	b->offset = vb->planes[0].m.offset;
142 	dprintk(3, "[%s]\n", ctx->name);
143 }
144 
145 static int _fill_vb2_buffer(struct vb2_buffer *vb, struct vb2_plane *planes)
146 {
147 	struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
148 
149 	planes[0].bytesused = 0;
150 	dprintk(3, "[%s]\n", ctx->name);
151 
152 	return 0;
153 }
154 
155 static const struct vb2_buf_ops dvb_vb2_buf_ops = {
156 	.fill_user_buffer	= _fill_dmx_buffer,
157 	.fill_vb2_buffer	= _fill_vb2_buffer,
158 };
159 
160 /*
161  * Videobuf operations
162  */
163 int dvb_vb2_init(struct dvb_vb2_ctx *ctx, const char *name, int nonblocking)
164 {
165 	struct vb2_queue *q = &ctx->vb_q;
166 	int ret;
167 
168 	memset(ctx, 0, sizeof(struct dvb_vb2_ctx));
169 	q->type = DVB_BUF_TYPE_CAPTURE;
170 	/**only mmap is supported currently*/
171 	q->io_modes = VB2_MMAP;
172 	q->drv_priv = ctx;
173 	q->buf_struct_size = sizeof(struct dvb_buffer);
174 	q->min_queued_buffers = 1;
175 	q->ops = &dvb_vb2_qops;
176 	q->mem_ops = &vb2_vmalloc_memops;
177 	q->buf_ops = &dvb_vb2_buf_ops;
178 	ret = vb2_core_queue_init(q);
179 	if (ret) {
180 		ctx->state = DVB_VB2_STATE_NONE;
181 		dprintk(1, "[%s] errno=%d\n", ctx->name, ret);
182 		return ret;
183 	}
184 
185 	mutex_init(&ctx->mutex);
186 	spin_lock_init(&ctx->slock);
187 	INIT_LIST_HEAD(&ctx->dvb_q);
188 
189 	strscpy(ctx->name, name, DVB_VB2_NAME_MAX);
190 	ctx->nonblocking = nonblocking;
191 	ctx->state = DVB_VB2_STATE_INIT;
192 
193 	dprintk(3, "[%s]\n", ctx->name);
194 
195 	return 0;
196 }
197 
198 int dvb_vb2_release(struct dvb_vb2_ctx *ctx)
199 {
200 	struct vb2_queue *q = (struct vb2_queue *)&ctx->vb_q;
201 
202 	if (ctx->state & DVB_VB2_STATE_INIT)
203 		vb2_core_queue_release(q);
204 
205 	ctx->state = DVB_VB2_STATE_NONE;
206 	dprintk(3, "[%s]\n", ctx->name);
207 
208 	return 0;
209 }
210 
211 int dvb_vb2_stream_on(struct dvb_vb2_ctx *ctx)
212 {
213 	struct vb2_queue *q = &ctx->vb_q;
214 	int ret;
215 
216 	ret = vb2_core_streamon(q, q->type);
217 	if (ret) {
218 		ctx->state = DVB_VB2_STATE_NONE;
219 		dprintk(1, "[%s] errno=%d\n", ctx->name, ret);
220 		return ret;
221 	}
222 	ctx->state |= DVB_VB2_STATE_STREAMON;
223 	dprintk(3, "[%s]\n", ctx->name);
224 
225 	return 0;
226 }
227 
228 int dvb_vb2_stream_off(struct dvb_vb2_ctx *ctx)
229 {
230 	struct vb2_queue *q = (struct vb2_queue *)&ctx->vb_q;
231 	int ret;
232 
233 	ctx->state &= ~DVB_VB2_STATE_STREAMON;
234 	ret = vb2_core_streamoff(q, q->type);
235 	if (ret) {
236 		ctx->state = DVB_VB2_STATE_NONE;
237 		dprintk(1, "[%s] errno=%d\n", ctx->name, ret);
238 		return ret;
239 	}
240 	dprintk(3, "[%s]\n", ctx->name);
241 
242 	return 0;
243 }
244 
245 int dvb_vb2_is_streaming(struct dvb_vb2_ctx *ctx)
246 {
247 	return (ctx->state & DVB_VB2_STATE_STREAMON);
248 }
249 
250 int dvb_vb2_fill_buffer(struct dvb_vb2_ctx *ctx,
251 			const unsigned char *src, int len,
252 			enum dmx_buffer_flags *buffer_flags)
253 {
254 	unsigned long flags = 0;
255 	void *vbuf = NULL;
256 	int todo = len;
257 	unsigned char *psrc = (unsigned char *)src;
258 	int ll = 0;
259 
260 	/*
261 	 * normal case: This func is called twice from demux driver
262 	 * one with valid src pointer, second time with NULL pointer
263 	 */
264 	if (!src || !len)
265 		return 0;
266 	spin_lock_irqsave(&ctx->slock, flags);
267 	if (buffer_flags && *buffer_flags) {
268 		ctx->flags |= *buffer_flags;
269 		*buffer_flags = 0;
270 	}
271 	while (todo) {
272 		if (!ctx->buf) {
273 			if (list_empty(&ctx->dvb_q)) {
274 				dprintk(3, "[%s] Buffer overflow!!!\n",
275 					ctx->name);
276 				break;
277 			}
278 
279 			ctx->buf = list_entry(ctx->dvb_q.next,
280 					      struct dvb_buffer, list);
281 			ctx->remain = vb2_plane_size(&ctx->buf->vb, 0);
282 			ctx->offset = 0;
283 		}
284 
285 		if (!dvb_vb2_is_streaming(ctx)) {
286 			vb2_buffer_done(&ctx->buf->vb, VB2_BUF_STATE_ERROR);
287 			list_del(&ctx->buf->list);
288 			ctx->buf = NULL;
289 			break;
290 		}
291 
292 		/* Fill buffer */
293 		ll = min(todo, ctx->remain);
294 		vbuf = vb2_plane_vaddr(&ctx->buf->vb, 0);
295 		memcpy(vbuf + ctx->offset, psrc, ll);
296 		todo -= ll;
297 		psrc += ll;
298 
299 		ctx->remain -= ll;
300 		ctx->offset += ll;
301 
302 		if (ctx->remain == 0) {
303 			vb2_buffer_done(&ctx->buf->vb, VB2_BUF_STATE_DONE);
304 			list_del(&ctx->buf->list);
305 			ctx->buf = NULL;
306 		}
307 	}
308 
309 	if (ctx->nonblocking && ctx->buf) {
310 		vb2_set_plane_payload(&ctx->buf->vb, 0, ll);
311 		vb2_buffer_done(&ctx->buf->vb, VB2_BUF_STATE_DONE);
312 		list_del(&ctx->buf->list);
313 		ctx->buf = NULL;
314 	}
315 	spin_unlock_irqrestore(&ctx->slock, flags);
316 
317 	if (todo)
318 		dprintk(1, "[%s] %d bytes are dropped.\n", ctx->name, todo);
319 	else
320 		dprintk(3, "[%s]\n", ctx->name);
321 
322 	dprintk(3, "[%s] %d bytes are copied\n", ctx->name, len - todo);
323 	return (len - todo);
324 }
325 
326 int dvb_vb2_reqbufs(struct dvb_vb2_ctx *ctx, struct dmx_requestbuffers *req)
327 {
328 	int ret;
329 
330 	/* Adjust size to a sane value */
331 	if (req->size > DVB_V2_MAX_SIZE)
332 		req->size = DVB_V2_MAX_SIZE;
333 
334 	/* FIXME: round req->size to a 188 or 204 multiple */
335 
336 	ctx->buf_siz = req->size;
337 	ctx->buf_cnt = req->count;
338 	ret = vb2_core_reqbufs(&ctx->vb_q, VB2_MEMORY_MMAP, 0, &req->count);
339 	if (ret) {
340 		ctx->state = DVB_VB2_STATE_NONE;
341 		dprintk(1, "[%s] count=%d size=%d errno=%d\n", ctx->name,
342 			ctx->buf_cnt, ctx->buf_siz, ret);
343 		return ret;
344 	}
345 	ctx->state |= DVB_VB2_STATE_REQBUFS;
346 	dprintk(3, "[%s] count=%d size=%d\n", ctx->name,
347 		ctx->buf_cnt, ctx->buf_siz);
348 
349 	return 0;
350 }
351 
352 int dvb_vb2_querybuf(struct dvb_vb2_ctx *ctx, struct dmx_buffer *b)
353 {
354 	struct vb2_queue *q = &ctx->vb_q;
355 	struct vb2_buffer *vb2 = vb2_get_buffer(q, b->index);
356 
357 	if (!vb2) {
358 		dprintk(1, "[%s] invalid buffer index\n", ctx->name);
359 		return -EINVAL;
360 	}
361 	vb2_core_querybuf(&ctx->vb_q, vb2, b);
362 	dprintk(3, "[%s] index=%d\n", ctx->name, b->index);
363 	return 0;
364 }
365 
366 int dvb_vb2_expbuf(struct dvb_vb2_ctx *ctx, struct dmx_exportbuffer *exp)
367 {
368 	struct vb2_queue *q = &ctx->vb_q;
369 	int ret;
370 
371 	ret = vb2_core_expbuf(&ctx->vb_q, &exp->fd, q->type, q->bufs[exp->index],
372 			      0, exp->flags);
373 	if (ret) {
374 		dprintk(1, "[%s] index=%d errno=%d\n", ctx->name,
375 			exp->index, ret);
376 		return ret;
377 	}
378 	dprintk(3, "[%s] index=%d fd=%d\n", ctx->name, exp->index, exp->fd);
379 
380 	return 0;
381 }
382 
383 int dvb_vb2_qbuf(struct dvb_vb2_ctx *ctx, struct dmx_buffer *b)
384 {
385 	struct vb2_queue *q = &ctx->vb_q;
386 	struct vb2_buffer *vb2 = vb2_get_buffer(q, b->index);
387 	int ret;
388 
389 	if (!vb2) {
390 		dprintk(1, "[%s] invalid buffer index\n", ctx->name);
391 		return -EINVAL;
392 	}
393 	ret = vb2_core_qbuf(&ctx->vb_q, vb2, b, NULL);
394 	if (ret) {
395 		dprintk(1, "[%s] index=%d errno=%d\n", ctx->name,
396 			b->index, ret);
397 		return ret;
398 	}
399 	dprintk(5, "[%s] index=%d\n", ctx->name, b->index);
400 
401 	return 0;
402 }
403 
404 int dvb_vb2_dqbuf(struct dvb_vb2_ctx *ctx, struct dmx_buffer *b)
405 {
406 	unsigned long flags;
407 	int ret;
408 
409 	ret = vb2_core_dqbuf(&ctx->vb_q, &b->index, b, ctx->nonblocking);
410 	if (ret) {
411 		dprintk(1, "[%s] errno=%d\n", ctx->name, ret);
412 		return ret;
413 	}
414 
415 	spin_lock_irqsave(&ctx->slock, flags);
416 	b->count = ctx->count++;
417 	b->flags = ctx->flags;
418 	ctx->flags = 0;
419 	spin_unlock_irqrestore(&ctx->slock, flags);
420 
421 	dprintk(5, "[%s] index=%d, count=%d, flags=%d\n",
422 		ctx->name, b->index, ctx->count, b->flags);
423 
424 
425 	return 0;
426 }
427 
428 int dvb_vb2_mmap(struct dvb_vb2_ctx *ctx, struct vm_area_struct *vma)
429 {
430 	int ret;
431 
432 	ret = vb2_mmap(&ctx->vb_q, vma);
433 	if (ret) {
434 		dprintk(1, "[%s] errno=%d\n", ctx->name, ret);
435 		return ret;
436 	}
437 	dprintk(3, "[%s] ret=%d\n", ctx->name, ret);
438 
439 	return 0;
440 }
441 
442 __poll_t dvb_vb2_poll(struct dvb_vb2_ctx *ctx, struct file *file,
443 		      poll_table *wait)
444 {
445 	dprintk(3, "[%s]\n", ctx->name);
446 	return vb2_core_poll(&ctx->vb_q, file, wait);
447 }
448 
449