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