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Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
[GitHub/LineageOS/android_kernel_samsung_universal7580.git] / drivers / media / video / videobuf-dma-sg.c
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/slab.h>
25 #include <linux/interrupt.h>
26
27 #include <linux/dma-mapping.h>
28 #include <linux/vmalloc.h>
29 #include <linux/pagemap.h>
30 #include <linux/scatterlist.h>
31 #include <asm/page.h>
32 #include <asm/pgtable.h>
33
34 #include <media/videobuf-dma-sg.h>
35
36 #define MAGIC_DMABUF 0x19721112
37 #define MAGIC_SG_MEM 0x17890714
38
39 #define MAGIC_CHECK(is,should) if (unlikely((is) != (should))) \
40 { printk(KERN_ERR "magic mismatch: %x (expected %x)\n",is,should); BUG(); }
41
42 static int debug;
43 module_param(debug, int, 0644);
44
45 MODULE_DESCRIPTION("helper module to manage video4linux dma sg buffers");
46 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
47 MODULE_LICENSE("GPL");
48
49 #define dprintk(level, fmt, arg...) if (debug >= level) \
50 printk(KERN_DEBUG "vbuf-sg: " fmt , ## arg)
51
52 /* --------------------------------------------------------------------- */
53
54 struct scatterlist*
55 videobuf_vmalloc_to_sg(unsigned char *virt, int nr_pages)
56 {
57 struct scatterlist *sglist;
58 struct page *pg;
59 int i;
60
61 sglist = vmalloc(nr_pages * sizeof(*sglist));
62 if (NULL == sglist)
63 return NULL;
64 memset(sglist, 0, nr_pages * sizeof(*sglist));
65 sg_init_table(sglist, nr_pages);
66 for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) {
67 pg = vmalloc_to_page(virt);
68 if (NULL == pg)
69 goto err;
70 BUG_ON(PageHighMem(pg));
71 sg_set_page(&sglist[i], pg, PAGE_SIZE, 0);
72 }
73 return sglist;
74
75 err:
76 vfree(sglist);
77 return NULL;
78 }
79
80 struct scatterlist*
81 videobuf_pages_to_sg(struct page **pages, int nr_pages, int offset)
82 {
83 struct scatterlist *sglist;
84 int i;
85
86 if (NULL == pages[0])
87 return NULL;
88 sglist = vmalloc(nr_pages * sizeof(*sglist));
89 if (NULL == sglist)
90 return NULL;
91 sg_init_table(sglist, nr_pages);
92
93 if (PageHighMem(pages[0]))
94 /* DMA to highmem pages might not work */
95 goto highmem;
96 sg_set_page(&sglist[0], pages[0], PAGE_SIZE - offset, offset);
97 for (i = 1; i < nr_pages; i++) {
98 if (NULL == pages[i])
99 goto nopage;
100 if (PageHighMem(pages[i]))
101 goto highmem;
102 sg_set_page(&sglist[i], pages[i], PAGE_SIZE, 0);
103 }
104 return sglist;
105
106 nopage:
107 dprintk(2,"sgl: oops - no page\n");
108 vfree(sglist);
109 return NULL;
110
111 highmem:
112 dprintk(2,"sgl: oops - highmem page\n");
113 vfree(sglist);
114 return NULL;
115 }
116
117 /* --------------------------------------------------------------------- */
118
119 struct videobuf_dmabuf *videobuf_to_dma (struct videobuf_buffer *buf)
120 {
121 struct videobuf_dma_sg_memory *mem = buf->priv;
122 BUG_ON(!mem);
123
124 MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
125
126 return &mem->dma;
127 }
128
129 void videobuf_dma_init(struct videobuf_dmabuf *dma)
130 {
131 memset(dma,0,sizeof(*dma));
132 dma->magic = MAGIC_DMABUF;
133 }
134
135 static int videobuf_dma_init_user_locked(struct videobuf_dmabuf *dma,
136 int direction, unsigned long data, unsigned long size)
137 {
138 unsigned long first,last;
139 int err, rw = 0;
140
141 dma->direction = direction;
142 switch (dma->direction) {
143 case DMA_FROM_DEVICE:
144 rw = READ;
145 break;
146 case DMA_TO_DEVICE:
147 rw = WRITE;
148 break;
149 default:
150 BUG();
151 }
152
153 first = (data & PAGE_MASK) >> PAGE_SHIFT;
154 last = ((data+size-1) & PAGE_MASK) >> PAGE_SHIFT;
155 dma->offset = data & ~PAGE_MASK;
156 dma->nr_pages = last-first+1;
157 dma->pages = kmalloc(dma->nr_pages * sizeof(struct page*),
158 GFP_KERNEL);
159 if (NULL == dma->pages)
160 return -ENOMEM;
161 dprintk(1,"init user [0x%lx+0x%lx => %d pages]\n",
162 data,size,dma->nr_pages);
163
164 err = get_user_pages(current,current->mm,
165 data & PAGE_MASK, dma->nr_pages,
166 rw == READ, 1, /* force */
167 dma->pages, NULL);
168
169 if (err != dma->nr_pages) {
170 dma->nr_pages = (err >= 0) ? err : 0;
171 dprintk(1,"get_user_pages: err=%d [%d]\n",err,dma->nr_pages);
172 return err < 0 ? err : -EINVAL;
173 }
174 return 0;
175 }
176
177 int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction,
178 unsigned long data, unsigned long size)
179 {
180 int ret;
181 down_read(&current->mm->mmap_sem);
182 ret = videobuf_dma_init_user_locked(dma, direction, data, size);
183 up_read(&current->mm->mmap_sem);
184
185 return ret;
186 }
187
188 int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction,
189 int nr_pages)
190 {
191 dprintk(1,"init kernel [%d pages]\n",nr_pages);
192 dma->direction = direction;
193 dma->vmalloc = vmalloc_32(nr_pages << PAGE_SHIFT);
194 if (NULL == dma->vmalloc) {
195 dprintk(1,"vmalloc_32(%d pages) failed\n",nr_pages);
196 return -ENOMEM;
197 }
198 dprintk(1,"vmalloc is at addr 0x%08lx, size=%d\n",
199 (unsigned long)dma->vmalloc,
200 nr_pages << PAGE_SHIFT);
201 memset(dma->vmalloc,0,nr_pages << PAGE_SHIFT);
202 dma->nr_pages = nr_pages;
203 return 0;
204 }
205
206 int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction,
207 dma_addr_t addr, int nr_pages)
208 {
209 dprintk(1,"init overlay [%d pages @ bus 0x%lx]\n",
210 nr_pages,(unsigned long)addr);
211 dma->direction = direction;
212 if (0 == addr)
213 return -EINVAL;
214
215 dma->bus_addr = addr;
216 dma->nr_pages = nr_pages;
217 return 0;
218 }
219
220 int videobuf_dma_map(struct videobuf_queue* q, struct videobuf_dmabuf *dma)
221 {
222 MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
223 BUG_ON(0 == dma->nr_pages);
224
225 if (dma->pages) {
226 dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages,
227 dma->offset);
228 }
229 if (dma->vmalloc) {
230 dma->sglist = videobuf_vmalloc_to_sg
231 (dma->vmalloc,dma->nr_pages);
232 }
233 if (dma->bus_addr) {
234 dma->sglist = vmalloc(sizeof(*dma->sglist));
235 if (NULL != dma->sglist) {
236 dma->sglen = 1;
237 sg_dma_address(&dma->sglist[0]) = dma->bus_addr & PAGE_MASK;
238 dma->sglist[0].offset = dma->bus_addr & ~PAGE_MASK;
239 sg_dma_len(&dma->sglist[0]) = dma->nr_pages * PAGE_SIZE;
240 }
241 }
242 if (NULL == dma->sglist) {
243 dprintk(1,"scatterlist is NULL\n");
244 return -ENOMEM;
245 }
246 if (!dma->bus_addr) {
247 dma->sglen = dma_map_sg(q->dev, dma->sglist,
248 dma->nr_pages, dma->direction);
249 if (0 == dma->sglen) {
250 printk(KERN_WARNING
251 "%s: videobuf_map_sg failed\n",__func__);
252 vfree(dma->sglist);
253 dma->sglist = NULL;
254 dma->sglen = 0;
255 return -ENOMEM;
256 }
257 }
258 return 0;
259 }
260
261 int videobuf_dma_sync(struct videobuf_queue *q, struct videobuf_dmabuf *dma)
262 {
263 MAGIC_CHECK(dma->magic, MAGIC_DMABUF);
264 BUG_ON(!dma->sglen);
265
266 dma_sync_sg_for_cpu(q->dev, dma->sglist, dma->nr_pages, dma->direction);
267 return 0;
268 }
269
270 int videobuf_dma_unmap(struct videobuf_queue* q,struct videobuf_dmabuf *dma)
271 {
272 MAGIC_CHECK(dma->magic, MAGIC_DMABUF);
273 if (!dma->sglen)
274 return 0;
275
276 dma_unmap_sg(q->dev, dma->sglist, dma->nr_pages, dma->direction);
277
278 vfree(dma->sglist);
279 dma->sglist = NULL;
280 dma->sglen = 0;
281 return 0;
282 }
283
284 int videobuf_dma_free(struct videobuf_dmabuf *dma)
285 {
286 MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
287 BUG_ON(dma->sglen);
288
289 if (dma->pages) {
290 int i;
291 for (i=0; i < dma->nr_pages; i++)
292 page_cache_release(dma->pages[i]);
293 kfree(dma->pages);
294 dma->pages = NULL;
295 }
296
297 vfree(dma->vmalloc);
298 dma->vmalloc = NULL;
299
300 if (dma->bus_addr) {
301 dma->bus_addr = 0;
302 }
303 dma->direction = DMA_NONE;
304 return 0;
305 }
306
307 /* --------------------------------------------------------------------- */
308
309 int videobuf_sg_dma_map(struct device *dev, struct videobuf_dmabuf *dma)
310 {
311 struct videobuf_queue q;
312
313 q.dev = dev;
314
315 return videobuf_dma_map(&q, dma);
316 }
317
318 int videobuf_sg_dma_unmap(struct device *dev, struct videobuf_dmabuf *dma)
319 {
320 struct videobuf_queue q;
321
322 q.dev = dev;
323
324 return videobuf_dma_unmap(&q, dma);
325 }
326
327 /* --------------------------------------------------------------------- */
328
329 static void
330 videobuf_vm_open(struct vm_area_struct *vma)
331 {
332 struct videobuf_mapping *map = vma->vm_private_data;
333
334 dprintk(2,"vm_open %p [count=%d,vma=%08lx-%08lx]\n",map,
335 map->count,vma->vm_start,vma->vm_end);
336 map->count++;
337 }
338
339 static void
340 videobuf_vm_close(struct vm_area_struct *vma)
341 {
342 struct videobuf_mapping *map = vma->vm_private_data;
343 struct videobuf_queue *q = map->q;
344 struct videobuf_dma_sg_memory *mem;
345 int i;
346
347 dprintk(2,"vm_close %p [count=%d,vma=%08lx-%08lx]\n",map,
348 map->count,vma->vm_start,vma->vm_end);
349
350 map->count--;
351 if (0 == map->count) {
352 dprintk(1,"munmap %p q=%p\n",map,q);
353 mutex_lock(&q->vb_lock);
354 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
355 if (NULL == q->bufs[i])
356 continue;
357 mem=q->bufs[i]->priv;
358
359 if (!mem)
360 continue;
361
362 MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
363
364 if (q->bufs[i]->map != map)
365 continue;
366 q->bufs[i]->map = NULL;
367 q->bufs[i]->baddr = 0;
368 q->ops->buf_release(q,q->bufs[i]);
369 }
370 mutex_unlock(&q->vb_lock);
371 kfree(map);
372 }
373 return;
374 }
375
376 /*
377 * Get a anonymous page for the mapping. Make sure we can DMA to that
378 * memory location with 32bit PCI devices (i.e. don't use highmem for
379 * now ...). Bounce buffers don't work very well for the data rates
380 * video capture has.
381 */
382 static int
383 videobuf_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
384 {
385 struct page *page;
386
387 dprintk(3,"fault: fault @ %08lx [vma %08lx-%08lx]\n",
388 (unsigned long)vmf->virtual_address,vma->vm_start,vma->vm_end);
389 page = alloc_page(GFP_USER | __GFP_DMA32);
390 if (!page)
391 return VM_FAULT_OOM;
392 clear_user_highpage(page, (unsigned long)vmf->virtual_address);
393 vmf->page = page;
394 return 0;
395 }
396
397 static const struct vm_operations_struct videobuf_vm_ops =
398 {
399 .open = videobuf_vm_open,
400 .close = videobuf_vm_close,
401 .fault = videobuf_vm_fault,
402 };
403
404 /* ---------------------------------------------------------------------
405 * SG handlers for the generic methods
406 */
407
408 /* Allocated area consists on 3 parts:
409 struct video_buffer
410 struct <driver>_buffer (cx88_buffer, saa7134_buf, ...)
411 struct videobuf_dma_sg_memory
412 */
413
414 static void *__videobuf_alloc(size_t size)
415 {
416 struct videobuf_dma_sg_memory *mem;
417 struct videobuf_buffer *vb;
418
419 vb = kzalloc(size+sizeof(*mem),GFP_KERNEL);
420
421 mem = vb->priv = ((char *)vb)+size;
422 mem->magic=MAGIC_SG_MEM;
423
424 videobuf_dma_init(&mem->dma);
425
426 dprintk(1,"%s: allocated at %p(%ld+%ld) & %p(%ld)\n",
427 __func__,vb,(long)sizeof(*vb),(long)size-sizeof(*vb),
428 mem,(long)sizeof(*mem));
429
430 return vb;
431 }
432
433 static void *__videobuf_to_vmalloc (struct videobuf_buffer *buf)
434 {
435 struct videobuf_dma_sg_memory *mem = buf->priv;
436 BUG_ON(!mem);
437
438 MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
439
440 return mem->dma.vmalloc;
441 }
442
443 static int __videobuf_iolock (struct videobuf_queue* q,
444 struct videobuf_buffer *vb,
445 struct v4l2_framebuffer *fbuf)
446 {
447 int err,pages;
448 dma_addr_t bus;
449 struct videobuf_dma_sg_memory *mem = vb->priv;
450 BUG_ON(!mem);
451
452 MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
453
454 switch (vb->memory) {
455 case V4L2_MEMORY_MMAP:
456 case V4L2_MEMORY_USERPTR:
457 if (0 == vb->baddr) {
458 /* no userspace addr -- kernel bounce buffer */
459 pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
460 err = videobuf_dma_init_kernel( &mem->dma,
461 DMA_FROM_DEVICE,
462 pages );
463 if (0 != err)
464 return err;
465 } else if (vb->memory == V4L2_MEMORY_USERPTR) {
466 /* dma directly to userspace */
467 err = videobuf_dma_init_user( &mem->dma,
468 DMA_FROM_DEVICE,
469 vb->baddr,vb->bsize );
470 if (0 != err)
471 return err;
472 } else {
473 /* NOTE: HACK: videobuf_iolock on V4L2_MEMORY_MMAP
474 buffers can only be called from videobuf_qbuf
475 we take current->mm->mmap_sem there, to prevent
476 locking inversion, so don't take it here */
477
478 err = videobuf_dma_init_user_locked(&mem->dma,
479 DMA_FROM_DEVICE,
480 vb->baddr, vb->bsize);
481 if (0 != err)
482 return err;
483 }
484 break;
485 case V4L2_MEMORY_OVERLAY:
486 if (NULL == fbuf)
487 return -EINVAL;
488 /* FIXME: need sanity checks for vb->boff */
489 /*
490 * Using a double cast to avoid compiler warnings when
491 * building for PAE. Compiler doesn't like direct casting
492 * of a 32 bit ptr to 64 bit integer.
493 */
494 bus = (dma_addr_t)(unsigned long)fbuf->base + vb->boff;
495 pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
496 err = videobuf_dma_init_overlay(&mem->dma, DMA_FROM_DEVICE,
497 bus, pages);
498 if (0 != err)
499 return err;
500 break;
501 default:
502 BUG();
503 }
504 err = videobuf_dma_map(q, &mem->dma);
505 if (0 != err)
506 return err;
507
508 return 0;
509 }
510
511 static int __videobuf_sync(struct videobuf_queue *q,
512 struct videobuf_buffer *buf)
513 {
514 struct videobuf_dma_sg_memory *mem = buf->priv;
515 BUG_ON(!mem);
516 MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
517
518 return videobuf_dma_sync(q,&mem->dma);
519 }
520
521 static int __videobuf_mmap_free(struct videobuf_queue *q)
522 {
523 int i;
524
525 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
526 if (q->bufs[i]) {
527 if (q->bufs[i]->map)
528 return -EBUSY;
529 }
530 }
531
532 return 0;
533 }
534
535 static int __videobuf_mmap_mapper(struct videobuf_queue *q,
536 struct vm_area_struct *vma)
537 {
538 struct videobuf_dma_sg_memory *mem;
539 struct videobuf_mapping *map;
540 unsigned int first,last,size,i;
541 int retval;
542
543 retval = -EINVAL;
544 if (!(vma->vm_flags & VM_WRITE)) {
545 dprintk(1,"mmap app bug: PROT_WRITE please\n");
546 goto done;
547 }
548 if (!(vma->vm_flags & VM_SHARED)) {
549 dprintk(1,"mmap app bug: MAP_SHARED please\n");
550 goto done;
551 }
552
553 /* This function maintains backwards compatibility with V4L1 and will
554 * map more than one buffer if the vma length is equal to the combined
555 * size of multiple buffers than it will map them together. See
556 * VIDIOCGMBUF in the v4l spec
557 *
558 * TODO: Allow drivers to specify if they support this mode
559 */
560
561 /* look for first buffer to map */
562 for (first = 0; first < VIDEO_MAX_FRAME; first++) {
563 if (NULL == q->bufs[first])
564 continue;
565 mem=q->bufs[first]->priv;
566 BUG_ON(!mem);
567 MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
568
569 if (V4L2_MEMORY_MMAP != q->bufs[first]->memory)
570 continue;
571 if (q->bufs[first]->boff == (vma->vm_pgoff << PAGE_SHIFT))
572 break;
573 }
574 if (VIDEO_MAX_FRAME == first) {
575 dprintk(1,"mmap app bug: offset invalid [offset=0x%lx]\n",
576 (vma->vm_pgoff << PAGE_SHIFT));
577 goto done;
578 }
579
580 /* look for last buffer to map */
581 for (size = 0, last = first; last < VIDEO_MAX_FRAME; last++) {
582 if (NULL == q->bufs[last])
583 continue;
584 if (V4L2_MEMORY_MMAP != q->bufs[last]->memory)
585 continue;
586 if (q->bufs[last]->map) {
587 retval = -EBUSY;
588 goto done;
589 }
590 size += q->bufs[last]->bsize;
591 if (size == (vma->vm_end - vma->vm_start))
592 break;
593 }
594 if (VIDEO_MAX_FRAME == last) {
595 dprintk(1,"mmap app bug: size invalid [size=0x%lx]\n",
596 (vma->vm_end - vma->vm_start));
597 goto done;
598 }
599
600 /* create mapping + update buffer list */
601 retval = -ENOMEM;
602 map = kmalloc(sizeof(struct videobuf_mapping),GFP_KERNEL);
603 if (NULL == map)
604 goto done;
605
606 size = 0;
607 for (i = first; i <= last; i++) {
608 if (NULL == q->bufs[i])
609 continue;
610 q->bufs[i]->map = map;
611 q->bufs[i]->baddr = vma->vm_start + size;
612 size += q->bufs[i]->bsize;
613 }
614
615 map->count = 1;
616 map->start = vma->vm_start;
617 map->end = vma->vm_end;
618 map->q = q;
619 vma->vm_ops = &videobuf_vm_ops;
620 vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED;
621 vma->vm_flags &= ~VM_IO; /* using shared anonymous pages */
622 vma->vm_private_data = map;
623 dprintk(1,"mmap %p: q=%p %08lx-%08lx pgoff %08lx bufs %d-%d\n",
624 map,q,vma->vm_start,vma->vm_end,vma->vm_pgoff,first,last);
625 retval = 0;
626
627 done:
628 return retval;
629 }
630
631 static int __videobuf_copy_to_user ( struct videobuf_queue *q,
632 char __user *data, size_t count,
633 int nonblocking )
634 {
635 struct videobuf_dma_sg_memory *mem = q->read_buf->priv;
636 BUG_ON(!mem);
637 MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
638
639 /* copy to userspace */
640 if (count > q->read_buf->size - q->read_off)
641 count = q->read_buf->size - q->read_off;
642
643 if (copy_to_user(data, mem->dma.vmalloc+q->read_off, count))
644 return -EFAULT;
645
646 return count;
647 }
648
649 static int __videobuf_copy_stream ( struct videobuf_queue *q,
650 char __user *data, size_t count, size_t pos,
651 int vbihack, int nonblocking )
652 {
653 unsigned int *fc;
654 struct videobuf_dma_sg_memory *mem = q->read_buf->priv;
655 BUG_ON(!mem);
656 MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
657
658 if (vbihack) {
659 /* dirty, undocumented hack -- pass the frame counter
660 * within the last four bytes of each vbi data block.
661 * We need that one to maintain backward compatibility
662 * to all vbi decoding software out there ... */
663 fc = (unsigned int*)mem->dma.vmalloc;
664 fc += (q->read_buf->size>>2) -1;
665 *fc = q->read_buf->field_count >> 1;
666 dprintk(1,"vbihack: %d\n",*fc);
667 }
668
669 /* copy stuff using the common method */
670 count = __videobuf_copy_to_user (q,data,count,nonblocking);
671
672 if ( (count==-EFAULT) && (0 == pos) )
673 return -EFAULT;
674
675 return count;
676 }
677
678 static struct videobuf_qtype_ops sg_ops = {
679 .magic = MAGIC_QTYPE_OPS,
680
681 .alloc = __videobuf_alloc,
682 .iolock = __videobuf_iolock,
683 .sync = __videobuf_sync,
684 .mmap_free = __videobuf_mmap_free,
685 .mmap_mapper = __videobuf_mmap_mapper,
686 .video_copy_to_user = __videobuf_copy_to_user,
687 .copy_stream = __videobuf_copy_stream,
688 .vmalloc = __videobuf_to_vmalloc,
689 };
690
691 void *videobuf_sg_alloc(size_t size)
692 {
693 struct videobuf_queue q;
694
695 /* Required to make generic handler to call __videobuf_alloc */
696 q.int_ops = &sg_ops;
697
698 q.msize = size;
699
700 return videobuf_alloc(&q);
701 }
702
703 void videobuf_queue_sg_init(struct videobuf_queue* q,
704 struct videobuf_queue_ops *ops,
705 struct device *dev,
706 spinlock_t *irqlock,
707 enum v4l2_buf_type type,
708 enum v4l2_field field,
709 unsigned int msize,
710 void *priv)
711 {
712 videobuf_queue_core_init(q, ops, dev, irqlock, type, field, msize,
713 priv, &sg_ops);
714 }
715
716 /* --------------------------------------------------------------------- */
717
718 EXPORT_SYMBOL_GPL(videobuf_vmalloc_to_sg);
719
720 EXPORT_SYMBOL_GPL(videobuf_to_dma);
721 EXPORT_SYMBOL_GPL(videobuf_dma_init);
722 EXPORT_SYMBOL_GPL(videobuf_dma_init_user);
723 EXPORT_SYMBOL_GPL(videobuf_dma_init_kernel);
724 EXPORT_SYMBOL_GPL(videobuf_dma_init_overlay);
725 EXPORT_SYMBOL_GPL(videobuf_dma_map);
726 EXPORT_SYMBOL_GPL(videobuf_dma_sync);
727 EXPORT_SYMBOL_GPL(videobuf_dma_unmap);
728 EXPORT_SYMBOL_GPL(videobuf_dma_free);
729
730 EXPORT_SYMBOL_GPL(videobuf_sg_dma_map);
731 EXPORT_SYMBOL_GPL(videobuf_sg_dma_unmap);
732 EXPORT_SYMBOL_GPL(videobuf_sg_alloc);
733
734 EXPORT_SYMBOL_GPL(videobuf_queue_sg_init);
735
736 /*
737 * Local variables:
738 * c-basic-offset: 8
739 * End:
740 */