Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
[linux-2.6] / drivers / media / video / videobuf-dma-sg.c
1 /*
2  * helper functions for PCI DMA video4linux capture buffers
3  *
4  * The functions expect the hardware being able to scatter gatter
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/pci.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 = 0;
43 module_param(debug, int, 0644);
44
45 MODULE_DESCRIPTION("helper module to manage video4linux pci 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 = kcalloc(nr_pages, sizeof(struct scatterlist), GFP_KERNEL);
62         if (NULL == sglist)
63                 return NULL;
64         sg_init_table(sglist, nr_pages);
65         for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) {
66                 pg = vmalloc_to_page(virt);
67                 if (NULL == pg)
68                         goto err;
69                 BUG_ON(PageHighMem(pg));
70                 sg_set_page(&sglist[i], pg, PAGE_SIZE, 0);
71         }
72         return sglist;
73
74  err:
75         kfree(sglist);
76         return NULL;
77 }
78
79 struct scatterlist*
80 videobuf_pages_to_sg(struct page **pages, int nr_pages, int offset)
81 {
82         struct scatterlist *sglist;
83         int i = 0;
84
85         if (NULL == pages[0])
86                 return NULL;
87         sglist = kcalloc(nr_pages, sizeof(*sglist), GFP_KERNEL);
88         if (NULL == sglist)
89                 return NULL;
90         sg_init_table(sglist, nr_pages);
91
92         if (NULL == pages[0])
93                 goto nopage;
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         kfree(sglist);
110         return NULL;
111
112  highmem:
113         dprintk(2,"sgl: oops - highmem page\n");
114         kfree(sglist);
115         return NULL;
116 }
117
118 /* --------------------------------------------------------------------- */
119
120 struct videobuf_dmabuf *videobuf_to_dma (struct videobuf_buffer *buf)
121 {
122         struct videbuf_pci_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 PCI_DMA_FROMDEVICE: rw = READ;  break;
145         case PCI_DMA_TODEVICE:   rw = WRITE; break;
146         default:                 BUG();
147         }
148
149         first = (data          & PAGE_MASK) >> PAGE_SHIFT;
150         last  = ((data+size-1) & PAGE_MASK) >> PAGE_SHIFT;
151         dma->offset   = data & ~PAGE_MASK;
152         dma->nr_pages = last-first+1;
153         dma->pages = kmalloc(dma->nr_pages * sizeof(struct page*),
154                              GFP_KERNEL);
155         if (NULL == dma->pages)
156                 return -ENOMEM;
157         dprintk(1,"init user [0x%lx+0x%lx => %d pages]\n",
158                 data,size,dma->nr_pages);
159
160         dma->varea = (void *) data;
161
162
163         err = get_user_pages(current,current->mm,
164                              data & PAGE_MASK, dma->nr_pages,
165                              rw == READ, 1, /* force */
166                              dma->pages, NULL);
167
168         if (err != dma->nr_pages) {
169                 dma->nr_pages = (err >= 0) ? err : 0;
170                 dprintk(1,"get_user_pages: err=%d [%d]\n",err,dma->nr_pages);
171                 return err < 0 ? err : -EINVAL;
172         }
173         return 0;
174 }
175
176 int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction,
177                            unsigned long data, unsigned long size)
178 {
179         int ret;
180         down_read(&current->mm->mmap_sem);
181         ret = videobuf_dma_init_user_locked(dma, direction, data, size);
182         up_read(&current->mm->mmap_sem);
183
184         return ret;
185 }
186
187 int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction,
188                              int nr_pages)
189 {
190         dprintk(1,"init kernel [%d pages]\n",nr_pages);
191         dma->direction = direction;
192         dma->vmalloc = vmalloc_32(nr_pages << PAGE_SHIFT);
193         if (NULL == dma->vmalloc) {
194                 dprintk(1,"vmalloc_32(%d pages) failed\n",nr_pages);
195                 return -ENOMEM;
196         }
197         dprintk(1,"vmalloc is at addr 0x%08lx, size=%d\n",
198                                 (unsigned long)dma->vmalloc,
199                                 nr_pages << PAGE_SHIFT);
200         memset(dma->vmalloc,0,nr_pages << PAGE_SHIFT);
201         dma->nr_pages = nr_pages;
202         return 0;
203 }
204
205 int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction,
206                               dma_addr_t addr, int nr_pages)
207 {
208         dprintk(1,"init overlay [%d pages @ bus 0x%lx]\n",
209                 nr_pages,(unsigned long)addr);
210         dma->direction = direction;
211         if (0 == addr)
212                 return -EINVAL;
213
214         dma->bus_addr = addr;
215         dma->nr_pages = nr_pages;
216         return 0;
217 }
218
219 int videobuf_dma_map(struct videobuf_queue* q,struct videobuf_dmabuf *dma)
220 {
221         void                   *dev=q->dev;
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 = kmalloc(sizeof(struct scatterlist), GFP_KERNEL);
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 = pci_map_sg(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",__FUNCTION__);
253                         kfree(dma->sglist);
254                         dma->sglist = NULL;
255                         dma->sglen = 0;
256                         return -EIO;
257                 }
258         }
259         return 0;
260 }
261
262 int videobuf_dma_sync(struct videobuf_queue *q,struct videobuf_dmabuf *dma)
263 {
264         void                   *dev=q->dev;
265
266         MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
267         BUG_ON(!dma->sglen);
268
269         pci_dma_sync_sg_for_cpu (dev,dma->sglist,dma->nr_pages,dma->direction);
270         return 0;
271 }
272
273 int videobuf_dma_unmap(struct videobuf_queue* q,struct videobuf_dmabuf *dma)
274 {
275         void                   *dev=q->dev;
276
277         MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
278         if (!dma->sglen)
279                 return 0;
280
281         pci_unmap_sg (dev,dma->sglist,dma->nr_pages,dma->direction);
282
283         kfree(dma->sglist);
284         dma->sglist = NULL;
285         dma->sglen = 0;
286         return 0;
287 }
288
289 int videobuf_dma_free(struct videobuf_dmabuf *dma)
290 {
291         MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
292         BUG_ON(dma->sglen);
293
294         if (dma->pages) {
295                 int i;
296                 for (i=0; i < dma->nr_pages; i++)
297                         page_cache_release(dma->pages[i]);
298                 kfree(dma->pages);
299                 dma->pages = NULL;
300         }
301
302         vfree(dma->vmalloc);
303         dma->vmalloc = NULL;
304         dma->varea = NULL;
305
306         if (dma->bus_addr) {
307                 dma->bus_addr = 0;
308         }
309         dma->direction = PCI_DMA_NONE;
310         return 0;
311 }
312
313 /* --------------------------------------------------------------------- */
314
315 int videobuf_pci_dma_map(struct pci_dev *pci,struct videobuf_dmabuf *dma)
316 {
317         struct videobuf_queue q;
318
319         q.dev=pci;
320
321         return (videobuf_dma_map(&q,dma));
322 }
323
324 int videobuf_pci_dma_unmap(struct pci_dev *pci,struct videobuf_dmabuf *dma)
325 {
326         struct videobuf_queue q;
327
328         q.dev=pci;
329
330         return (videobuf_dma_unmap(&q,dma));
331 }
332
333 /* --------------------------------------------------------------------- */
334
335 static void
336 videobuf_vm_open(struct vm_area_struct *vma)
337 {
338         struct videobuf_mapping *map = vma->vm_private_data;
339
340         dprintk(2,"vm_open %p [count=%d,vma=%08lx-%08lx]\n",map,
341                 map->count,vma->vm_start,vma->vm_end);
342         map->count++;
343 }
344
345 static void
346 videobuf_vm_close(struct vm_area_struct *vma)
347 {
348         struct videobuf_mapping *map = vma->vm_private_data;
349         struct videobuf_queue *q = map->q;
350         struct videbuf_pci_sg_memory *mem;
351         int i;
352
353         dprintk(2,"vm_close %p [count=%d,vma=%08lx-%08lx]\n",map,
354                 map->count,vma->vm_start,vma->vm_end);
355
356         map->count--;
357         if (0 == map->count) {
358                 dprintk(1,"munmap %p q=%p\n",map,q);
359                 mutex_lock(&q->vb_lock);
360                 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
361                         if (NULL == q->bufs[i])
362                                 continue;
363                         mem=q->bufs[i]->priv;
364
365                         if (!mem)
366                                 continue;
367
368                         MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
369
370                         if (q->bufs[i]->map != map)
371                                 continue;
372                         q->bufs[i]->map   = NULL;
373                         q->bufs[i]->baddr = 0;
374                         q->ops->buf_release(q,q->bufs[i]);
375                 }
376                 mutex_unlock(&q->vb_lock);
377                 kfree(map);
378         }
379         return;
380 }
381
382 /*
383  * Get a anonymous page for the mapping.  Make sure we can DMA to that
384  * memory location with 32bit PCI devices (i.e. don't use highmem for
385  * now ...).  Bounce buffers don't work very well for the data rates
386  * video capture has.
387  */
388 static int
389 videobuf_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
390 {
391         struct page *page;
392
393         dprintk(3,"fault: fault @ %08lx [vma %08lx-%08lx]\n",
394                 (unsigned long)vmf->virtual_address,vma->vm_start,vma->vm_end);
395         page = alloc_page(GFP_USER | __GFP_DMA32);
396         if (!page)
397                 return VM_FAULT_OOM;
398         clear_user_page(page_address(page), (unsigned long)vmf->virtual_address,
399                         page);
400         vmf->page = page;
401         return 0;
402 }
403
404 static struct vm_operations_struct videobuf_vm_ops =
405 {
406         .open     = videobuf_vm_open,
407         .close    = videobuf_vm_close,
408         .fault    = videobuf_vm_fault,
409 };
410
411 /* ---------------------------------------------------------------------
412  * PCI handlers for the generic methods
413  */
414
415 /* Allocated area consists on 3 parts:
416         struct video_buffer
417         struct <driver>_buffer (cx88_buffer, saa7134_buf, ...)
418         struct videobuf_pci_sg_memory
419  */
420
421 static void *__videobuf_alloc(size_t size)
422 {
423         struct videbuf_pci_sg_memory *mem;
424         struct videobuf_buffer *vb;
425
426         vb = kzalloc(size+sizeof(*mem),GFP_KERNEL);
427
428         mem = vb->priv = ((char *)vb)+size;
429         mem->magic=MAGIC_SG_MEM;
430
431         videobuf_dma_init(&mem->dma);
432
433         dprintk(1,"%s: allocated at %p(%ld+%ld) & %p(%ld)\n",
434                 __FUNCTION__,vb,(long)sizeof(*vb),(long)size-sizeof(*vb),
435                 mem,(long)sizeof(*mem));
436
437         return vb;
438 }
439
440 static int __videobuf_iolock (struct videobuf_queue* q,
441                               struct videobuf_buffer *vb,
442                               struct v4l2_framebuffer *fbuf)
443 {
444         int err,pages;
445         dma_addr_t bus;
446         struct videbuf_pci_sg_memory *mem=vb->priv;
447         BUG_ON(!mem);
448
449         MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
450
451         switch (vb->memory) {
452         case V4L2_MEMORY_MMAP:
453         case V4L2_MEMORY_USERPTR:
454                 if (0 == vb->baddr) {
455                         /* no userspace addr -- kernel bounce buffer */
456                         pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
457                         err = videobuf_dma_init_kernel( &mem->dma,
458                                                         PCI_DMA_FROMDEVICE,
459                                                         pages );
460                         if (0 != err)
461                                 return err;
462                 } else if (vb->memory == V4L2_MEMORY_USERPTR) {
463                         /* dma directly to userspace */
464                         err = videobuf_dma_init_user( &mem->dma,
465                                                       PCI_DMA_FROMDEVICE,
466                                                       vb->baddr,vb->bsize );
467                         if (0 != err)
468                                 return err;
469                 } else {
470                         /* NOTE: HACK: videobuf_iolock on V4L2_MEMORY_MMAP
471                         buffers can only be called from videobuf_qbuf
472                         we take current->mm->mmap_sem there, to prevent
473                         locking inversion, so don't take it here */
474
475                         err = videobuf_dma_init_user_locked(&mem->dma,
476                                                       PCI_DMA_FROMDEVICE,
477                                                       vb->baddr, vb->bsize);
478                         if (0 != err)
479                                 return err;
480                 }
481                 break;
482         case V4L2_MEMORY_OVERLAY:
483                 if (NULL == fbuf)
484                         return -EINVAL;
485                 /* FIXME: need sanity checks for vb->boff */
486                 /*
487                  * Using a double cast to avoid compiler warnings when
488                  * building for PAE. Compiler doesn't like direct casting
489                  * of a 32 bit ptr to 64 bit integer.
490                  */
491                 bus   = (dma_addr_t)(unsigned long)fbuf->base + vb->boff;
492                 pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
493                 err = videobuf_dma_init_overlay(&mem->dma,PCI_DMA_FROMDEVICE,
494                                                 bus, pages);
495                 if (0 != err)
496                         return err;
497                 break;
498         default:
499                 BUG();
500         }
501         err = videobuf_dma_map(q,&mem->dma);
502         if (0 != err)
503                 return err;
504
505         return 0;
506 }
507
508 static int __videobuf_sync(struct videobuf_queue *q,
509                            struct videobuf_buffer *buf)
510 {
511         struct videbuf_pci_sg_memory *mem=buf->priv;
512         BUG_ON (!mem);
513         MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
514
515         return  videobuf_dma_sync(q,&mem->dma);
516 }
517
518 static int __videobuf_mmap_free(struct videobuf_queue *q)
519 {
520         int i;
521
522         for (i = 0; i < VIDEO_MAX_FRAME; i++) {
523                 if (q->bufs[i]) {
524                         if (q->bufs[i]->map)
525                                 return -EBUSY;
526                 }
527         }
528
529         return 0;
530 }
531
532 static int __videobuf_mmap_mapper(struct videobuf_queue *q,
533                          struct vm_area_struct *vma)
534 {
535         struct videbuf_pci_sg_memory *mem;
536         struct videobuf_mapping *map;
537         unsigned int first,last,size,i;
538         int retval;
539
540         retval = -EINVAL;
541         if (!(vma->vm_flags & VM_WRITE)) {
542                 dprintk(1,"mmap app bug: PROT_WRITE please\n");
543                 goto done;
544         }
545         if (!(vma->vm_flags & VM_SHARED)) {
546                 dprintk(1,"mmap app bug: MAP_SHARED please\n");
547                 goto done;
548         }
549
550         /* look for first buffer to map */
551         for (first = 0; first < VIDEO_MAX_FRAME; first++) {
552                 if (NULL == q->bufs[first])
553                         continue;
554                 mem=q->bufs[first]->priv;
555                 BUG_ON (!mem);
556                 MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
557
558                 if (V4L2_MEMORY_MMAP != q->bufs[first]->memory)
559                         continue;
560                 if (q->bufs[first]->boff == (vma->vm_pgoff << PAGE_SHIFT))
561                         break;
562         }
563         if (VIDEO_MAX_FRAME == first) {
564                 dprintk(1,"mmap app bug: offset invalid [offset=0x%lx]\n",
565                         (vma->vm_pgoff << PAGE_SHIFT));
566                 goto done;
567         }
568
569         /* look for last buffer to map */
570         for (size = 0, last = first; last < VIDEO_MAX_FRAME; last++) {
571                 if (NULL == q->bufs[last])
572                         continue;
573                 if (V4L2_MEMORY_MMAP != q->bufs[last]->memory)
574                         continue;
575                 if (q->bufs[last]->map) {
576                         retval = -EBUSY;
577                         goto done;
578                 }
579                 size += q->bufs[last]->bsize;
580                 if (size == (vma->vm_end - vma->vm_start))
581                         break;
582         }
583         if (VIDEO_MAX_FRAME == last) {
584                 dprintk(1,"mmap app bug: size invalid [size=0x%lx]\n",
585                         (vma->vm_end - vma->vm_start));
586                 goto done;
587         }
588
589         /* create mapping + update buffer list */
590         retval = -ENOMEM;
591         map = kmalloc(sizeof(struct videobuf_mapping),GFP_KERNEL);
592         if (NULL == map)
593                 goto done;
594         for (size = 0, i = first; i <= last; size += q->bufs[i++]->bsize) {
595                 q->bufs[i]->map   = map;
596                 q->bufs[i]->baddr = vma->vm_start + size;
597         }
598         map->count    = 1;
599         map->start    = vma->vm_start;
600         map->end      = vma->vm_end;
601         map->q        = q;
602         vma->vm_ops   = &videobuf_vm_ops;
603         vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED;
604         vma->vm_flags &= ~VM_IO; /* using shared anonymous pages */
605         vma->vm_private_data = map;
606         dprintk(1,"mmap %p: q=%p %08lx-%08lx pgoff %08lx bufs %d-%d\n",
607                 map,q,vma->vm_start,vma->vm_end,vma->vm_pgoff,first,last);
608         retval = 0;
609
610  done:
611         return retval;
612 }
613
614 static int __videobuf_copy_to_user ( struct videobuf_queue *q,
615                                 char __user *data, size_t count,
616                                 int nonblocking )
617 {
618         struct videbuf_pci_sg_memory *mem=q->read_buf->priv;
619         BUG_ON (!mem);
620         MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
621
622         /* copy to userspace */
623         if (count > q->read_buf->size - q->read_off)
624                 count = q->read_buf->size - q->read_off;
625
626         if (copy_to_user(data, mem->dma.vmalloc+q->read_off, count))
627                 return -EFAULT;
628
629         return count;
630 }
631
632 static int __videobuf_copy_stream ( struct videobuf_queue *q,
633                                 char __user *data, size_t count, size_t pos,
634                                 int vbihack, int nonblocking )
635 {
636         unsigned int  *fc;
637         struct videbuf_pci_sg_memory *mem=q->read_buf->priv;
638         BUG_ON (!mem);
639         MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
640
641         if (vbihack) {
642                 /* dirty, undocumented hack -- pass the frame counter
643                         * within the last four bytes of each vbi data block.
644                         * We need that one to maintain backward compatibility
645                         * to all vbi decoding software out there ... */
646                 fc  = (unsigned int*)mem->dma.vmalloc;
647                 fc += (q->read_buf->size>>2) -1;
648                 *fc = q->read_buf->field_count >> 1;
649                 dprintk(1,"vbihack: %d\n",*fc);
650         }
651
652         /* copy stuff using the common method */
653         count = __videobuf_copy_to_user (q,data,count,nonblocking);
654
655         if ( (count==-EFAULT) && (0 == pos) )
656                 return -EFAULT;
657
658         return count;
659 }
660
661 static struct videobuf_qtype_ops pci_ops = {
662         .magic        = MAGIC_QTYPE_OPS,
663
664         .alloc        = __videobuf_alloc,
665         .iolock       = __videobuf_iolock,
666         .sync         = __videobuf_sync,
667         .mmap_free    = __videobuf_mmap_free,
668         .mmap_mapper  = __videobuf_mmap_mapper,
669         .video_copy_to_user = __videobuf_copy_to_user,
670         .copy_stream  = __videobuf_copy_stream,
671 };
672
673 void *videobuf_pci_alloc (size_t size)
674 {
675         struct videobuf_queue q;
676
677         /* Required to make generic handler to call __videobuf_alloc */
678         q.int_ops=&pci_ops;
679
680         q.msize=size;
681
682         return videobuf_alloc (&q);
683 }
684
685 void videobuf_queue_pci_init(struct videobuf_queue* q,
686                          struct videobuf_queue_ops *ops,
687                          void *dev,
688                          spinlock_t *irqlock,
689                          enum v4l2_buf_type type,
690                          enum v4l2_field field,
691                          unsigned int msize,
692                          void *priv)
693 {
694         videobuf_queue_core_init(q, ops, dev, irqlock, type, field, msize,
695                                  priv, &pci_ops);
696 }
697
698 /* --------------------------------------------------------------------- */
699
700 EXPORT_SYMBOL_GPL(videobuf_vmalloc_to_sg);
701
702 EXPORT_SYMBOL_GPL(videobuf_to_dma);
703 EXPORT_SYMBOL_GPL(videobuf_dma_init);
704 EXPORT_SYMBOL_GPL(videobuf_dma_init_user);
705 EXPORT_SYMBOL_GPL(videobuf_dma_init_kernel);
706 EXPORT_SYMBOL_GPL(videobuf_dma_init_overlay);
707 EXPORT_SYMBOL_GPL(videobuf_dma_map);
708 EXPORT_SYMBOL_GPL(videobuf_dma_sync);
709 EXPORT_SYMBOL_GPL(videobuf_dma_unmap);
710 EXPORT_SYMBOL_GPL(videobuf_dma_free);
711
712 EXPORT_SYMBOL_GPL(videobuf_pci_dma_map);
713 EXPORT_SYMBOL_GPL(videobuf_pci_dma_unmap);
714 EXPORT_SYMBOL_GPL(videobuf_pci_alloc);
715
716 EXPORT_SYMBOL_GPL(videobuf_queue_pci_init);
717
718 /*
719  * Local variables:
720  * c-basic-offset: 8
721  * End:
722  */