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Linux 2.6.34-rc3
[pohmelfs.git] / drivers / media / video / videobuf-dma-sg.c
blobfcd045e7a1c1e2ea90ca0ead71766e3e55e7a5b7
1 /*
2 * helper functions for SG DMA video4linux capture buffers
3 *
4 * The functions expect the hardware being able to scatter gather
5 * (i.e. the buffers are not linear in physical memory, but fragmented
6 * into PAGE_SIZE chunks). They also assume the driver does not need
7 * to touch the video data.
8 *
9 * (c) 2007 Mauro Carvalho Chehab, <mchehab@infradead.org>
10 *
11 * Highly based on video-buf written originally by:
12 * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org>
13 * (c) 2006 Mauro Carvalho Chehab, <mchehab@infradead.org>
14 * (c) 2006 Ted Walther and John Sokol
15 *
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2
19 */
20
21 #include <linux/init.h>
22 #include <linux/module.h>
23 #include <linux/moduleparam.h>
24 #include <linux/sched.h>
25 #include <linux/slab.h>
26 #include <linux/interrupt.h>
27
28 #include <linux/dma-mapping.h>
29 #include <linux/vmalloc.h>
30 #include <linux/pagemap.h>
31 #include <linux/scatterlist.h>
32 #include <asm/page.h>
33 #include <asm/pgtable.h>
34
35 #include <media/videobuf-dma-sg.h>
36
37 #define MAGIC_DMABUF 0x19721112
38 #define MAGIC_SG_MEM 0x17890714
39
40 #define MAGIC_CHECK(is,should) if (unlikely((is) != (should))) \
41 { printk(KERN_ERR "magic mismatch: %x (expected %x)\n",is,should); BUG(); }
42
43 static int debug;
44 module_param(debug, int, 0644);
45
46 MODULE_DESCRIPTION("helper module to manage video4linux dma sg buffers");
47 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
48 MODULE_LICENSE("GPL");
49
50 #define dprintk(level, fmt, arg...) if (debug >= level) \
51 printk(KERN_DEBUG "vbuf-sg: " fmt , ## arg)
52
53 /* --------------------------------------------------------------------- */
54
55 struct scatterlist*
56 videobuf_vmalloc_to_sg(unsigned char *virt, int nr_pages)
57 {
58 struct scatterlist *sglist;
59 struct page *pg;
60 int i;
61
62 sglist = vmalloc(nr_pages * sizeof(*sglist));
63 if (NULL == sglist)
64 return NULL;
65 memset(sglist, 0, nr_pages * sizeof(*sglist));
66 sg_init_table(sglist, nr_pages);
67 for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) {
68 pg = vmalloc_to_page(virt);
69 if (NULL == pg)
70 goto err;
71 BUG_ON(PageHighMem(pg));
72 sg_set_page(&sglist[i], pg, PAGE_SIZE, 0);
73 }
74 return sglist;
75
76 err:
77 vfree(sglist);
78 return NULL;
79 }
80
81 struct scatterlist*
82 videobuf_pages_to_sg(struct page **pages, int nr_pages, int offset)
83 {
84 struct scatterlist *sglist;
85 int i;
86
87 if (NULL == pages[0])
88 return NULL;
89 sglist = vmalloc(nr_pages * sizeof(*sglist));
90 if (NULL == sglist)
91 return NULL;
92 sg_init_table(sglist, nr_pages);
93
94 if (PageHighMem(pages[0]))
95 /* DMA to highmem pages might not work */
96 goto highmem;
97 sg_set_page(&sglist[0], pages[0], PAGE_SIZE - offset, offset);
98 for (i = 1; i < nr_pages; i++) {
99 if (NULL == pages[i])
100 goto nopage;
101 if (PageHighMem(pages[i]))
102 goto highmem;
103 sg_set_page(&sglist[i], pages[i], PAGE_SIZE, 0);
104 }
105 return sglist;
106
107 nopage:
108 dprintk(2,"sgl: oops - no page\n");
109 vfree(sglist);
110 return NULL;
111
112 highmem:
113 dprintk(2,"sgl: oops - highmem page\n");
114 vfree(sglist);
115 return NULL;
116 }
117
118 /* --------------------------------------------------------------------- */
119
120 struct videobuf_dmabuf *videobuf_to_dma (struct videobuf_buffer *buf)
121 {
122 struct videobuf_dma_sg_memory *mem = buf->priv;
123 BUG_ON(!mem);
124
125 MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
126
127 return &mem->dma;
128 }
129
130 void videobuf_dma_init(struct videobuf_dmabuf *dma)
131 {
132 memset(dma,0,sizeof(*dma));
133 dma->magic = MAGIC_DMABUF;
134 }
135
136 static int videobuf_dma_init_user_locked(struct videobuf_dmabuf *dma,
137 int direction, unsigned long data, unsigned long size)
138 {
139 unsigned long first,last;
140 int err, rw = 0;
141
142 dma->direction = direction;
143 switch (dma->direction) {
144 case DMA_FROM_DEVICE:
145 rw = READ;
146 break;
147 case DMA_TO_DEVICE:
148 rw = WRITE;
149 break;
150 default:
151 BUG();
152 }
153
154 first = (data & PAGE_MASK) >> PAGE_SHIFT;
155 last = ((data+size-1) & PAGE_MASK) >> PAGE_SHIFT;
156 dma->offset = data & ~PAGE_MASK;
157 dma->nr_pages = last-first+1;
158 dma->pages = kmalloc(dma->nr_pages * sizeof(struct page*),
159 GFP_KERNEL);
160 if (NULL == dma->pages)
161 return -ENOMEM;
162 dprintk(1,"init user [0x%lx+0x%lx => %d pages]\n",
163 data,size,dma->nr_pages);
164
165 err = get_user_pages(current,current->mm,
166 data & PAGE_MASK, dma->nr_pages,
167 rw == READ, 1, /* force */
168 dma->pages, NULL);
169
170 if (err != dma->nr_pages) {
171 dma->nr_pages = (err >= 0) ? err : 0;
172 dprintk(1,"get_user_pages: err=%d [%d]\n",err,dma->nr_pages);
173 return err < 0 ? err : -EINVAL;
174 }
175 return 0;
176 }
177
178 int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction,
179 unsigned long data, unsigned long size)
180 {
181 int ret;
182 down_read(&current->mm->mmap_sem);
183 ret = videobuf_dma_init_user_locked(dma, direction, data, size);
184 up_read(&current->mm->mmap_sem);
185
186 return ret;
187 }
188
189 int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction,
190 int nr_pages)
191 {
192 dprintk(1,"init kernel [%d pages]\n",nr_pages);
193 dma->direction = direction;
194 dma->vmalloc = vmalloc_32(nr_pages << PAGE_SHIFT);
195 if (NULL == dma->vmalloc) {
196 dprintk(1,"vmalloc_32(%d pages) failed\n",nr_pages);
197 return -ENOMEM;
198 }
199 dprintk(1,"vmalloc is at addr 0x%08lx, size=%d\n",
200 (unsigned long)dma->vmalloc,
201 nr_pages << PAGE_SHIFT);
202 memset(dma->vmalloc,0,nr_pages << PAGE_SHIFT);
203 dma->nr_pages = nr_pages;
204 return 0;
205 }
206
207 int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction,
208 dma_addr_t addr, int nr_pages)
209 {
210 dprintk(1,"init overlay [%d pages @ bus 0x%lx]\n",
211 nr_pages,(unsigned long)addr);
212 dma->direction = direction;
213 if (0 == addr)
214 return -EINVAL;
215
216 dma->bus_addr = addr;
217 dma->nr_pages = nr_pages;
218 return 0;
219 }
220
221 int videobuf_dma_map(struct videobuf_queue* q, struct videobuf_dmabuf *dma)
222 {
223 MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
224 BUG_ON(0 == dma->nr_pages);
225
226 if (dma->pages) {
227 dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages,
228 dma->offset);
229 }
230 if (dma->vmalloc) {
231 dma->sglist = videobuf_vmalloc_to_sg
232 (dma->vmalloc,dma->nr_pages);
233 }
234 if (dma->bus_addr) {
235 dma->sglist = vmalloc(sizeof(*dma->sglist));
236 if (NULL != dma->sglist) {
237 dma->sglen = 1;
238 sg_dma_address(&dma->sglist[0]) = dma->bus_addr & PAGE_MASK;
239 dma->sglist[0].offset = dma->bus_addr & ~PAGE_MASK;
240 sg_dma_len(&dma->sglist[0]) = dma->nr_pages * PAGE_SIZE;
241 }
242 }
243 if (NULL == dma->sglist) {
244 dprintk(1,"scatterlist is NULL\n");
245 return -ENOMEM;
246 }
247 if (!dma->bus_addr) {
248 dma->sglen = dma_map_sg(q->dev, dma->sglist,
249 dma->nr_pages, dma->direction);
250 if (0 == dma->sglen) {
251 printk(KERN_WARNING
252 "%s: videobuf_map_sg failed\n",__func__);
253 vfree(dma->sglist);
254 dma->sglist = NULL;
255 dma->sglen = 0;
256 return -ENOMEM;
257 }
258 }
259 return 0;
260 }
261
262 int videobuf_dma_sync(struct videobuf_queue *q, struct videobuf_dmabuf *dma)
263 {
264 MAGIC_CHECK(dma->magic, MAGIC_DMABUF);
265 BUG_ON(!dma->sglen);
266
267 dma_sync_sg_for_cpu(q->dev, dma->sglist, dma->nr_pages, dma->direction);
268 return 0;
269 }
270
271 int videobuf_dma_unmap(struct videobuf_queue* q,struct videobuf_dmabuf *dma)
272 {
273 MAGIC_CHECK(dma->magic, MAGIC_DMABUF);
274 if (!dma->sglen)
275 return 0;
276
277 dma_unmap_sg(q->dev, dma->sglist, dma->nr_pages, dma->direction);
278
279 vfree(dma->sglist);
280 dma->sglist = NULL;
281 dma->sglen = 0;
282 return 0;
283 }
284
285 int videobuf_dma_free(struct videobuf_dmabuf *dma)
286 {
287 MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
288 BUG_ON(dma->sglen);
289
290 if (dma->pages) {
291 int i;
292 for (i=0; i < dma->nr_pages; i++)
293 page_cache_release(dma->pages[i]);
294 kfree(dma->pages);
295 dma->pages = NULL;
296 }
297
298 vfree(dma->vmalloc);
299 dma->vmalloc = NULL;
300
301 if (dma->bus_addr) {
302 dma->bus_addr = 0;
303 }
304 dma->direction = DMA_NONE;
305 return 0;
306 }
307
308 /* --------------------------------------------------------------------- */
309
310 int videobuf_sg_dma_map(struct device *dev, struct videobuf_dmabuf *dma)
311 {
312 struct videobuf_queue q;
313
314 q.dev = dev;
315
316 return videobuf_dma_map(&q, dma);
317 }
318
319 int videobuf_sg_dma_unmap(struct device *dev, struct videobuf_dmabuf *dma)
320 {
321 struct videobuf_queue q;
322
323 q.dev = dev;
324
325 return videobuf_dma_unmap(&q, dma);
326 }
327
328 /* --------------------------------------------------------------------- */
329
330 static void
331 videobuf_vm_open(struct vm_area_struct *vma)
332 {
333 struct videobuf_mapping *map = vma->vm_private_data;
334
335 dprintk(2,"vm_open %p [count=%d,vma=%08lx-%08lx]\n",map,
336 map->count,vma->vm_start,vma->vm_end);
337 map->count++;
338 }
339
340 static void
341 videobuf_vm_close(struct vm_area_struct *vma)
342 {
343 struct videobuf_mapping *map = vma->vm_private_data;
344 struct videobuf_queue *q = map->q;
345 struct videobuf_dma_sg_memory *mem;
346 int i;
347
348 dprintk(2,"vm_close %p [count=%d,vma=%08lx-%08lx]\n",map,
349 map->count,vma->vm_start,vma->vm_end);
350
351 map->count--;
352 if (0 == map->count) {
353 dprintk(1,"munmap %p q=%p\n",map,q);
354 mutex_lock(&q->vb_lock);
355 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
356 if (NULL == q->bufs[i])
357 continue;
358 mem=q->bufs[i]->priv;
359
360 if (!mem)
361 continue;
362
363 MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
364
365 if (q->bufs[i]->map != map)
366 continue;
367 q->bufs[i]->map = NULL;
368 q->bufs[i]->baddr = 0;
369 q->ops->buf_release(q,q->bufs[i]);
370 }
371 mutex_unlock(&q->vb_lock);
372 kfree(map);
373 }
374 return;
375 }
376
377 /*
378 * Get a anonymous page for the mapping. Make sure we can DMA to that
379 * memory location with 32bit PCI devices (i.e. don't use highmem for
380 * now ...). Bounce buffers don't work very well for the data rates
381 * video capture has.
382 */
383 static int
384 videobuf_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
385 {
386 struct page *page;
387
388 dprintk(3,"fault: fault @ %08lx [vma %08lx-%08lx]\n",
389 (unsigned long)vmf->virtual_address,vma->vm_start,vma->vm_end);
390 page = alloc_page(GFP_USER | __GFP_DMA32);
391 if (!page)
392 return VM_FAULT_OOM;
393 clear_user_highpage(page, (unsigned long)vmf->virtual_address);
394 vmf->page = page;
395 return 0;
396 }
397
398 static const struct vm_operations_struct videobuf_vm_ops =
399 {
400 .open = videobuf_vm_open,
401 .close = videobuf_vm_close,
402 .fault = videobuf_vm_fault,
403 };
404
405 /* ---------------------------------------------------------------------
406 * SG handlers for the generic methods
407 */
408
409 /* Allocated area consists on 3 parts:
410 struct video_buffer
411 struct <driver>_buffer (cx88_buffer, saa7134_buf, ...)
412 struct videobuf_dma_sg_memory
413 */
414
415 static void *__videobuf_alloc(size_t size)
416 {
417 struct videobuf_dma_sg_memory *mem;
418 struct videobuf_buffer *vb;
419
420 vb = kzalloc(size+sizeof(*mem),GFP_KERNEL);
421 if (!vb)
422 return vb;
423
424 mem = vb->priv = ((char *)vb)+size;
425 mem->magic=MAGIC_SG_MEM;
426
427 videobuf_dma_init(&mem->dma);
428
429 dprintk(1,"%s: allocated at %p(%ld+%ld) & %p(%ld)\n",
430 __func__,vb,(long)sizeof(*vb),(long)size-sizeof(*vb),
431 mem,(long)sizeof(*mem));
432
433 return vb;
434 }
435
436 static void *__videobuf_to_vmalloc (struct videobuf_buffer *buf)
437 {
438 struct videobuf_dma_sg_memory *mem = buf->priv;
439 BUG_ON(!mem);
440
441 MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
442
443 return mem->dma.vmalloc;
444 }
445
446 static int __videobuf_iolock (struct videobuf_queue* q,
447 struct videobuf_buffer *vb,
448 struct v4l2_framebuffer *fbuf)
449 {
450 int err,pages;
451 dma_addr_t bus;
452 struct videobuf_dma_sg_memory *mem = vb->priv;
453 BUG_ON(!mem);
454
455 MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
456
457 switch (vb->memory) {
458 case V4L2_MEMORY_MMAP:
459 case V4L2_MEMORY_USERPTR:
460 if (0 == vb->baddr) {
461 /* no userspace addr -- kernel bounce buffer */
462 pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
463 err = videobuf_dma_init_kernel( &mem->dma,
464 DMA_FROM_DEVICE,
465 pages );
466 if (0 != err)
467 return err;
468 } else if (vb->memory == V4L2_MEMORY_USERPTR) {
469 /* dma directly to userspace */
470 err = videobuf_dma_init_user( &mem->dma,
471 DMA_FROM_DEVICE,
472 vb->baddr,vb->bsize );
473 if (0 != err)
474 return err;
475 } else {
476 /* NOTE: HACK: videobuf_iolock on V4L2_MEMORY_MMAP
477 buffers can only be called from videobuf_qbuf
478 we take current->mm->mmap_sem there, to prevent
479 locking inversion, so don't take it here */
480
481 err = videobuf_dma_init_user_locked(&mem->dma,
482 DMA_FROM_DEVICE,
483 vb->baddr, vb->bsize);
484 if (0 != err)
485 return err;
486 }
487 break;
488 case V4L2_MEMORY_OVERLAY:
489 if (NULL == fbuf)
490 return -EINVAL;
491 /* FIXME: need sanity checks for vb->boff */
492 /*
493 * Using a double cast to avoid compiler warnings when
494 * building for PAE. Compiler doesn't like direct casting
495 * of a 32 bit ptr to 64 bit integer.
496 */
497 bus = (dma_addr_t)(unsigned long)fbuf->base + vb->boff;
498 pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
499 err = videobuf_dma_init_overlay(&mem->dma, DMA_FROM_DEVICE,
500 bus, pages);
501 if (0 != err)
502 return err;
503 break;
504 default:
505 BUG();
506 }
507 err = videobuf_dma_map(q, &mem->dma);
508 if (0 != err)
509 return err;
510
511 return 0;
512 }
513
514 static int __videobuf_sync(struct videobuf_queue *q,
515 struct videobuf_buffer *buf)
516 {
517 struct videobuf_dma_sg_memory *mem = buf->priv;
518 BUG_ON(!mem);
519 MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
520
521 return videobuf_dma_sync(q,&mem->dma);
522 }
523
524 static int __videobuf_mmap_free(struct videobuf_queue *q)
525 {
526 int i;
527
528 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
529 if (q->bufs[i]) {
530 if (q->bufs[i]->map)
531 return -EBUSY;
532 }
533 }
534
535 return 0;
536 }
537
538 static int __videobuf_mmap_mapper(struct videobuf_queue *q,
539 struct vm_area_struct *vma)
540 {
541 struct videobuf_dma_sg_memory *mem;
542 struct videobuf_mapping *map;
543 unsigned int first,last,size,i;
544 int retval;
545
546 retval = -EINVAL;
547 if (!(vma->vm_flags & VM_WRITE)) {
548 dprintk(1,"mmap app bug: PROT_WRITE please\n");
549 goto done;
550 }
551 if (!(vma->vm_flags & VM_SHARED)) {
552 dprintk(1,"mmap app bug: MAP_SHARED please\n");
553 goto done;
554 }
555
556 /* This function maintains backwards compatibility with V4L1 and will
557 * map more than one buffer if the vma length is equal to the combined
558 * size of multiple buffers than it will map them together. See
559 * VIDIOCGMBUF in the v4l spec
560 *
561 * TODO: Allow drivers to specify if they support this mode
562 */
563
564 /* look for first buffer to map */
565 for (first = 0; first < VIDEO_MAX_FRAME; first++) {
566 if (NULL == q->bufs[first])
567 continue;
568 mem=q->bufs[first]->priv;
569 BUG_ON(!mem);
570 MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
571
572 if (V4L2_MEMORY_MMAP != q->bufs[first]->memory)
573 continue;
574 if (q->bufs[first]->boff == (vma->vm_pgoff << PAGE_SHIFT))
575 break;
576 }
577 if (VIDEO_MAX_FRAME == first) {
578 dprintk(1,"mmap app bug: offset invalid [offset=0x%lx]\n",
579 (vma->vm_pgoff << PAGE_SHIFT));
580 goto done;
581 }
582
583 /* look for last buffer to map */
584 for (size = 0, last = first; last < VIDEO_MAX_FRAME; last++) {
585 if (NULL == q->bufs[last])
586 continue;
587 if (V4L2_MEMORY_MMAP != q->bufs[last]->memory)
588 continue;
589 if (q->bufs[last]->map) {
590 retval = -EBUSY;
591 goto done;
592 }
593 size += PAGE_ALIGN(q->bufs[last]->bsize);
594 if (size == (vma->vm_end - vma->vm_start))
595 break;
596 }
597 if (VIDEO_MAX_FRAME == last) {
598 dprintk(1,"mmap app bug: size invalid [size=0x%lx]\n",
599 (vma->vm_end - vma->vm_start));
600 goto done;
601 }
602
603 /* create mapping + update buffer list */
604 retval = -ENOMEM;
605 map = kmalloc(sizeof(struct videobuf_mapping),GFP_KERNEL);
606 if (NULL == map)
607 goto done;
608
609 size = 0;
610 for (i = first; i <= last; i++) {
611 if (NULL == q->bufs[i])
612 continue;
613 q->bufs[i]->map = map;
614 q->bufs[i]->baddr = vma->vm_start + size;
615 size += PAGE_ALIGN(q->bufs[i]->bsize);
616 }
617
618 map->count = 1;
619 map->start = vma->vm_start;
620 map->end = vma->vm_end;
621 map->q = q;
622 vma->vm_ops = &videobuf_vm_ops;
623 vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED;
624 vma->vm_flags &= ~VM_IO; /* using shared anonymous pages */
625 vma->vm_private_data = map;
626 dprintk(1,"mmap %p: q=%p %08lx-%08lx pgoff %08lx bufs %d-%d\n",
627 map,q,vma->vm_start,vma->vm_end,vma->vm_pgoff,first,last);
628 retval = 0;
629
630 done:
631 return retval;
632 }
633
634 static int __videobuf_copy_to_user ( struct videobuf_queue *q,
635 char __user *data, size_t count,
636 int nonblocking )
637 {
638 struct videobuf_dma_sg_memory *mem = q->read_buf->priv;
639 BUG_ON(!mem);
640 MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
641
642 /* copy to userspace */
643 if (count > q->read_buf->size - q->read_off)
644 count = q->read_buf->size - q->read_off;
645
646 if (copy_to_user(data, mem->dma.vmalloc+q->read_off, count))
647 return -EFAULT;
648
649 return count;
650 }
651
652 static int __videobuf_copy_stream ( struct videobuf_queue *q,
653 char __user *data, size_t count, size_t pos,
654 int vbihack, int nonblocking )
655 {
656 unsigned int *fc;
657 struct videobuf_dma_sg_memory *mem = q->read_buf->priv;
658 BUG_ON(!mem);
659 MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
660
661 if (vbihack) {
662 /* dirty, undocumented hack -- pass the frame counter
663 * within the last four bytes of each vbi data block.
664 * We need that one to maintain backward compatibility
665 * to all vbi decoding software out there ... */
666 fc = (unsigned int*)mem->dma.vmalloc;
667 fc += (q->read_buf->size>>2) -1;
668 *fc = q->read_buf->field_count >> 1;
669 dprintk(1,"vbihack: %d\n",*fc);
670 }
671
672 /* copy stuff using the common method */
673 count = __videobuf_copy_to_user (q,data,count,nonblocking);
674
675 if ( (count==-EFAULT) && (0 == pos) )
676 return -EFAULT;
677
678 return count;
679 }
680
681 static struct videobuf_qtype_ops sg_ops = {
682 .magic = MAGIC_QTYPE_OPS,
683
684 .alloc = __videobuf_alloc,
685 .iolock = __videobuf_iolock,
686 .sync = __videobuf_sync,
687 .mmap_free = __videobuf_mmap_free,
688 .mmap_mapper = __videobuf_mmap_mapper,
689 .video_copy_to_user = __videobuf_copy_to_user,
690 .copy_stream = __videobuf_copy_stream,
691 .vmalloc = __videobuf_to_vmalloc,
692 };
693
694 void *videobuf_sg_alloc(size_t size)
695 {
696 struct videobuf_queue q;
697
698 /* Required to make generic handler to call __videobuf_alloc */
699 q.int_ops = &sg_ops;
700
701 q.msize = size;
702
703 return videobuf_alloc(&q);
704 }
705
706 void videobuf_queue_sg_init(struct videobuf_queue* q,
707 const struct videobuf_queue_ops *ops,
708 struct device *dev,
709 spinlock_t *irqlock,
710 enum v4l2_buf_type type,
711 enum v4l2_field field,
712 unsigned int msize,
713 void *priv)
714 {
715 videobuf_queue_core_init(q, ops, dev, irqlock, type, field, msize,
716 priv, &sg_ops);
717 }
718
719 /* --------------------------------------------------------------------- */
720
721 EXPORT_SYMBOL_GPL(videobuf_vmalloc_to_sg);
722
723 EXPORT_SYMBOL_GPL(videobuf_to_dma);
724 EXPORT_SYMBOL_GPL(videobuf_dma_init);
725 EXPORT_SYMBOL_GPL(videobuf_dma_init_user);
726 EXPORT_SYMBOL_GPL(videobuf_dma_init_kernel);
727 EXPORT_SYMBOL_GPL(videobuf_dma_init_overlay);
728 EXPORT_SYMBOL_GPL(videobuf_dma_map);
729 EXPORT_SYMBOL_GPL(videobuf_dma_sync);
730 EXPORT_SYMBOL_GPL(videobuf_dma_unmap);
731 EXPORT_SYMBOL_GPL(videobuf_dma_free);
732
733 EXPORT_SYMBOL_GPL(videobuf_sg_dma_map);
734 EXPORT_SYMBOL_GPL(videobuf_sg_dma_unmap);
735 EXPORT_SYMBOL_GPL(videobuf_sg_alloc);
736
737 EXPORT_SYMBOL_GPL(videobuf_queue_sg_init);
738
739 /*
740 * Local variables:
741 * c-basic-offset: 8
742 * End:
743 */