2 * generic helper functions for video4linux capture buffers, to handle
3 * memory management and PCI DMA. Right now bttv + saa7134 use it.
5 * The functions expect the hardware being able to scatter gatter
6 * (i.e. the buffers are not linear in physical memory, but fragmented
7 * into PAGE_SIZE chunks). They also assume the driver does not need
8 * to touch the video data (thus it is probably not useful for USB as
9 * data often must be uncompressed by the drivers).
11 * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org>
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
19 #include <linux/init.h>
20 #include <linux/module.h>
21 #include <linux/vmalloc.h>
22 #include <linux/pagemap.h>
23 #include <linux/slab.h>
24 #include <linux/pci.h>
25 #include <linux/interrupt.h>
27 #include <asm/pgtable.h>
29 #include <media/video-buf.h>
33 MODULE_DESCRIPTION("helper module to manage video4linux pci dma buffers");
34 MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
35 MODULE_LICENSE("GPL");
36 MODULE_PARM(debug,"i");
38 #define dprintk(level, fmt, arg...) if (debug >= level) \
39 printk(KERN_DEBUG "vbuf: " fmt , ## arg)
42 videobuf_vmalloc_to_sg(unsigned char *virt, int nr_pages)
44 struct scatterlist *sglist;
48 sglist = kmalloc(sizeof(struct scatterlist)*nr_pages, GFP_KERNEL);
51 memset(sglist,0,sizeof(struct scatterlist)*nr_pages);
52 for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) {
53 pg = vmalloc_to_page(virt);
59 sglist[i].length = PAGE_SIZE;
69 videobuf_pages_to_sg(struct page **pages, int nr_pages, int offset)
71 struct scatterlist *sglist;
76 sglist = kmalloc(sizeof(*sglist) * nr_pages, GFP_KERNEL);
79 memset(sglist, 0, sizeof(*sglist) * nr_pages);
83 if (PageHighMem(pages[0]))
84 /* DMA to highmem pages might not work */
86 sglist[0].page = pages[0];
87 sglist[0].offset = offset;
88 sglist[0].length = PAGE_SIZE - offset;
89 for (i = 1; i < nr_pages; i++) {
92 if (PageHighMem(pages[i]))
94 sglist[i].page = pages[i];
95 sglist[i].length = PAGE_SIZE;
100 dprintk(2,"sgl: oops - no page\n");
105 dprintk(2,"sgl: oops - highmem page\n");
110 /* --------------------------------------------------------------------- */
112 int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction,
113 unsigned long data, unsigned long size)
115 unsigned long first,last;
118 dma->direction = direction;
119 switch (dma->direction) {
120 case PCI_DMA_FROMDEVICE: rw = READ; break;
121 case PCI_DMA_TODEVICE: rw = WRITE; break;
125 first = (data & PAGE_MASK) >> PAGE_SHIFT;
126 last = ((data+size-1) & PAGE_MASK) >> PAGE_SHIFT;
127 dma->offset = data & ~PAGE_MASK;
128 dma->nr_pages = last-first+1;
129 dma->pages = kmalloc(dma->nr_pages * sizeof(struct page*),
131 if (NULL == dma->pages)
133 dprintk(1,"init user [0x%lx+0x%lx => %d pages]\n",
134 data,size,dma->nr_pages);
136 down_read(¤t->mm->mmap_sem);
137 err = get_user_pages(current,current->mm,
138 data & PAGE_MASK, dma->nr_pages,
139 rw == READ, 1, /* force */
141 up_read(¤t->mm->mmap_sem);
142 if (err != dma->nr_pages) {
143 dma->nr_pages = (err >= 0) ? err : 0;
144 dprintk(1,"get_user_pages: err=%d [%d]\n",err,dma->nr_pages);
145 return err < 0 ? err : -EINVAL;
150 int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction,
153 dprintk(1,"init kernel [%d pages]\n",nr_pages);
154 dma->direction = direction;
155 dma->vmalloc = vmalloc_32(nr_pages << PAGE_SHIFT);
156 if (NULL == dma->vmalloc) {
157 dprintk(1,"vmalloc_32(%d pages) failed\n",nr_pages);
160 memset(dma->vmalloc,0,nr_pages << PAGE_SHIFT);
161 dma->nr_pages = nr_pages;
165 int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction,
166 dma_addr_t addr, int nr_pages)
168 dprintk(1,"init overlay [%d pages @ bus 0x%lx]\n",
169 nr_pages,(unsigned long)addr);
170 dma->direction = direction;
174 dma->bus_addr = addr;
175 dma->nr_pages = nr_pages;
179 int videobuf_dma_pci_map(struct pci_dev *dev, struct videobuf_dmabuf *dma)
181 if (0 == dma->nr_pages)
185 dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages,
189 dma->sglist = videobuf_vmalloc_to_sg
190 (dma->vmalloc,dma->nr_pages);
193 dma->sglist = kmalloc(sizeof(struct scatterlist), GFP_KERNEL);
194 if (NULL != dma->sglist) {
196 sg_dma_address(&dma->sglist[0]) = dma->bus_addr & PAGE_MASK;
197 dma->sglist[0].offset = dma->bus_addr & ~PAGE_MASK;
198 sg_dma_len(&dma->sglist[0]) = dma->nr_pages * PAGE_SIZE;
201 if (NULL == dma->sglist) {
202 dprintk(1,"scatterlist is NULL\n");
207 dma->sglen = pci_map_sg(dev,dma->sglist,dma->nr_pages,
212 int videobuf_dma_pci_sync(struct pci_dev *dev, struct videobuf_dmabuf *dma)
218 pci_dma_sync_sg_for_cpu(dev,dma->sglist,dma->nr_pages,dma->direction);
222 int videobuf_dma_pci_unmap(struct pci_dev *dev, struct videobuf_dmabuf *dma)
228 pci_unmap_sg(dev,dma->sglist,dma->nr_pages,dma->direction);
235 int videobuf_dma_free(struct videobuf_dmabuf *dma)
242 for (i=0; i < dma->nr_pages; i++)
243 page_cache_release(dma->pages[i]);
254 dma->direction = PCI_DMA_NONE;
258 /* --------------------------------------------------------------------- */
260 void* videobuf_alloc(unsigned int size)
262 struct videobuf_buffer *vb;
264 vb = kmalloc(size,GFP_KERNEL);
267 init_waitqueue_head(&vb->done);
272 int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr)
275 DECLARE_WAITQUEUE(wait, current);
277 add_wait_queue(&vb->done, &wait);
278 while (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED) {
283 set_current_state(intr ? TASK_INTERRUPTIBLE
284 : TASK_UNINTERRUPTIBLE);
285 if (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED)
287 set_current_state(TASK_RUNNING);
288 if (intr && signal_pending(current)) {
289 dprintk(1,"buffer waiton: -EINTR\n");
294 remove_wait_queue(&vb->done, &wait);
299 videobuf_iolock(struct pci_dev *pci, struct videobuf_buffer *vb,
300 struct v4l2_framebuffer *fbuf)
305 switch (vb->memory) {
306 case V4L2_MEMORY_MMAP:
307 case V4L2_MEMORY_USERPTR:
308 if (0 == vb->baddr) {
309 /* no userspace addr -- kernel bounce buffer */
310 pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
311 err = videobuf_dma_init_kernel(&vb->dma,PCI_DMA_FROMDEVICE,
316 /* dma directly to userspace */
317 err = videobuf_dma_init_user(&vb->dma,PCI_DMA_FROMDEVICE,
318 vb->baddr,vb->bsize);
323 case V4L2_MEMORY_OVERLAY:
326 /* FIXME: need sanity checks for vb->boff */
327 bus = (dma_addr_t)fbuf->base + vb->boff;
328 pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
329 err = videobuf_dma_init_overlay(&vb->dma,PCI_DMA_FROMDEVICE,
337 err = videobuf_dma_pci_map(pci,&vb->dma);
344 /* --------------------------------------------------------------------- */
347 videobuf_queue_init(struct videobuf_queue *q,
348 struct videobuf_queue_ops *ops,
351 enum v4l2_buf_type type,
352 enum v4l2_field field,
355 memset(q,0,sizeof(*q));
357 q->irqlock = irqlock;
364 init_MUTEX(&q->lock);
365 INIT_LIST_HEAD(&q->stream);
369 videobuf_queue_is_busy(struct videobuf_queue *q)
374 dprintk(1,"busy: streaming active\n");
378 dprintk(1,"busy: pending read #1\n");
382 dprintk(1,"busy: pending read #2\n");
385 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
386 if (NULL == q->bufs[i])
388 if (q->bufs[i]->map) {
389 dprintk(1,"busy: buffer #%d mapped\n",i);
392 if (q->bufs[i]->state == STATE_QUEUED) {
393 dprintk(1,"busy: buffer #%d queued\n",i);
396 if (q->bufs[i]->state == STATE_ACTIVE) {
397 dprintk(1,"busy: buffer #%d avtive\n",i);
405 videobuf_queue_cancel(struct file *file, struct videobuf_queue *q)
410 /* remove queued buffers from list */
411 spin_lock_irqsave(q->irqlock,flags);
412 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
413 if (NULL == q->bufs[i])
415 if (q->bufs[i]->state == STATE_QUEUED) {
416 list_del(&q->bufs[i]->queue);
417 q->bufs[i]->state = STATE_ERROR;
420 spin_unlock_irqrestore(q->irqlock,flags);
422 /* free all buffers + clear queue */
423 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
424 if (NULL == q->bufs[i])
426 q->ops->buf_release(file,q->bufs[i]);
428 INIT_LIST_HEAD(&q->stream);
431 /* --------------------------------------------------------------------- */
434 videobuf_next_field(struct videobuf_queue *q)
436 enum v4l2_field field = q->field;
438 BUG_ON(V4L2_FIELD_ANY == field);
440 if (V4L2_FIELD_ALTERNATE == field) {
441 if (V4L2_FIELD_TOP == q->last) {
442 field = V4L2_FIELD_BOTTOM;
443 q->last = V4L2_FIELD_BOTTOM;
445 field = V4L2_FIELD_TOP;
446 q->last = V4L2_FIELD_TOP;
453 videobuf_status(struct v4l2_buffer *b, struct videobuf_buffer *vb,
454 enum v4l2_buf_type type)
459 b->memory = vb->memory;
461 case V4L2_MEMORY_MMAP:
462 b->m.offset = vb->boff;
463 b->length = vb->bsize;
465 case V4L2_MEMORY_USERPTR:
466 b->m.userptr = vb->baddr;
467 b->length = vb->bsize;
469 case V4L2_MEMORY_OVERLAY:
470 b->m.offset = vb->boff;
476 b->flags |= V4L2_BUF_FLAG_MAPPED;
482 b->flags |= V4L2_BUF_FLAG_QUEUED;
486 b->flags |= V4L2_BUF_FLAG_DONE;
488 case STATE_NEEDS_INIT:
494 b->field = vb->field;
495 b->timestamp = vb->ts;
496 b->bytesused = vb->size;
497 b->sequence = vb->field_count >> 1;
501 videobuf_reqbufs(struct file *file, struct videobuf_queue *q,
502 struct v4l2_requestbuffers *req)
504 unsigned int size,count;
507 if (req->type != q->type)
511 if (req->memory != V4L2_MEMORY_MMAP &&
512 req->memory != V4L2_MEMORY_USERPTR &&
513 req->memory != V4L2_MEMORY_OVERLAY)
518 if (count > VIDEO_MAX_FRAME)
519 count = VIDEO_MAX_FRAME;
521 q->ops->buf_setup(file,&count,&size);
522 size = PAGE_ALIGN(size);
523 dprintk(1,"reqbufs: bufs=%d, size=0x%x [%d pages total]\n",
524 count, size, (count*size)>>PAGE_SHIFT);
526 retval = videobuf_mmap_setup(file,q,count,size,req->memory);
538 videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b)
540 if (unlikely(b->type != q->type))
542 if (unlikely(b->index < 0 || b->index >= VIDEO_MAX_FRAME))
544 if (unlikely(NULL == q->bufs[b->index]))
546 videobuf_status(b,q->bufs[b->index],q->type);
551 videobuf_qbuf(struct file *file, struct videobuf_queue *q,
552 struct v4l2_buffer *b)
554 struct videobuf_buffer *buf;
555 enum v4l2_field field;
564 if (b->type != q->type)
566 if (b->index < 0 || b->index >= VIDEO_MAX_FRAME)
568 buf = q->bufs[b->index];
571 if (buf->memory != b->memory)
573 if (buf->state == STATE_QUEUED ||
574 buf->state == STATE_ACTIVE)
578 case V4L2_MEMORY_MMAP:
582 case V4L2_MEMORY_USERPTR:
583 if (b->length < buf->bsize)
585 buf->baddr = b->m.userptr;
587 case V4L2_MEMORY_OVERLAY:
588 buf->boff = b->m.offset;
594 field = videobuf_next_field(q);
595 retval = q->ops->buf_prepare(file,buf,field);
599 list_add_tail(&buf->stream,&q->stream);
601 spin_lock_irqsave(q->irqlock,flags);
602 q->ops->buf_queue(file,buf);
603 spin_unlock_irqrestore(q->irqlock,flags);
613 videobuf_dqbuf(struct file *file, struct videobuf_queue *q,
614 struct v4l2_buffer *b)
616 struct videobuf_buffer *buf;
624 if (b->type != q->type)
626 if (list_empty(&q->stream))
628 buf = list_entry(q->stream.next, struct videobuf_buffer, stream);
629 retval = videobuf_waiton(buf, file->f_flags & O_NONBLOCK, 1);
632 switch (buf->state) {
637 videobuf_dma_pci_sync(q->pci,&buf->dma);
638 buf->state = STATE_IDLE;
644 list_del(&buf->stream);
645 memset(b,0,sizeof(*b));
646 videobuf_status(b,buf,q->type);
653 int videobuf_streamon(struct file *file, struct videobuf_queue *q)
655 struct videobuf_buffer *buf;
656 struct list_head *list;
668 spin_lock_irqsave(q->irqlock,flags);
669 list_for_each(list,&q->stream) {
670 buf = list_entry(list, struct videobuf_buffer, stream);
671 if (buf->state == STATE_PREPARED)
672 q->ops->buf_queue(file,buf);
674 spin_unlock_irqrestore(q->irqlock,flags);
681 int videobuf_streamoff(struct file *file, struct videobuf_queue *q)
683 int retval = -EINVAL;
688 videobuf_queue_cancel(file,q);
698 videobuf_read_zerocopy(struct file *file, struct videobuf_queue *q,
699 char *data, size_t count, loff_t *ppos)
701 enum v4l2_field field;
707 q->read_buf = videobuf_alloc(q->msize);
708 if (NULL == q->read_buf)
711 q->read_buf->memory = V4L2_MEMORY_USERPTR;
712 q->read_buf->baddr = (unsigned long)data;
713 q->read_buf->bsize = count;
714 field = videobuf_next_field(q);
715 retval = q->ops->buf_prepare(file,q->read_buf,field);
719 /* start capture & wait */
720 spin_lock_irqsave(q->irqlock,flags);
721 q->ops->buf_queue(file,q->read_buf);
722 spin_unlock_irqrestore(q->irqlock,flags);
723 retval = videobuf_waiton(q->read_buf,0,0);
725 videobuf_dma_pci_sync(q->pci,&q->read_buf->dma);
726 if (STATE_ERROR == q->read_buf->state)
729 retval = q->read_buf->size;
734 q->ops->buf_release(file,q->read_buf);
740 ssize_t videobuf_read_one(struct file *file, struct videobuf_queue *q,
741 char *data, size_t count, loff_t *ppos)
743 enum v4l2_field field;
745 unsigned size, nbufs, bytes;
751 q->ops->buf_setup(file,&nbufs,&size);
752 if (NULL == q->read_buf &&
754 !(file->f_flags & O_NONBLOCK)) {
755 retval = videobuf_read_zerocopy(file,q,data,count,ppos);
756 if (retval >= 0 || retval == -EIO)
759 /* fallback to kernel bounce buffer on failures */
762 if (NULL == q->read_buf) {
763 /* need to capture a new frame */
765 q->read_buf = videobuf_alloc(q->msize);
766 if (NULL == q->read_buf)
768 q->read_buf->memory = V4L2_MEMORY_USERPTR;
769 field = videobuf_next_field(q);
770 retval = q->ops->buf_prepare(file,q->read_buf,field);
773 spin_lock_irqsave(q->irqlock,flags);
774 q->ops->buf_queue(file,q->read_buf);
775 spin_unlock_irqrestore(q->irqlock,flags);
779 /* wait until capture is done */
780 retval = videobuf_waiton(q->read_buf, file->f_flags & O_NONBLOCK, 1);
783 videobuf_dma_pci_sync(q->pci,&q->read_buf->dma);
785 if (STATE_ERROR == q->read_buf->state) {
786 /* catch I/O errors */
787 q->ops->buf_release(file,q->read_buf);
794 /* copy to userspace */
796 if (bytes > q->read_buf->size - q->read_off)
797 bytes = q->read_buf->size - q->read_off;
799 if (copy_to_user(data, q->read_buf->dma.vmalloc+q->read_off, bytes))
803 q->read_off += bytes;
804 if (q->read_off == q->read_buf->size) {
805 /* all data copied, cleanup */
806 q->ops->buf_release(file,q->read_buf);
816 int videobuf_read_start(struct file *file, struct videobuf_queue *q)
818 enum v4l2_field field;
820 int count = 0, size = 0;
823 q->ops->buf_setup(file,&count,&size);
826 if (count > VIDEO_MAX_FRAME)
827 count = VIDEO_MAX_FRAME;
828 size = PAGE_ALIGN(size);
830 err = videobuf_mmap_setup(file, q, count, size, V4L2_MEMORY_USERPTR);
833 for (i = 0; i < count; i++) {
834 field = videobuf_next_field(q);
835 err = q->ops->buf_prepare(file,q->bufs[i],field);
838 list_add_tail(&q->bufs[i]->stream, &q->stream);
840 spin_lock_irqsave(q->irqlock,flags);
841 for (i = 0; i < count; i++)
842 q->ops->buf_queue(file,q->bufs[i]);
843 spin_unlock_irqrestore(q->irqlock,flags);
848 void videobuf_read_stop(struct file *file, struct videobuf_queue *q)
852 videobuf_queue_cancel(file,q);
853 INIT_LIST_HEAD(&q->stream);
854 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
855 if (NULL == q->bufs[i])
864 ssize_t videobuf_read_stream(struct file *file, struct videobuf_queue *q,
865 char *data, size_t count, loff_t *ppos,
868 unsigned int *fc, bytes;
877 retval = videobuf_read_start(file,q);
884 /* get / wait for data */
885 if (NULL == q->read_buf) {
886 q->read_buf = list_entry(q->stream.next,
887 struct videobuf_buffer,
889 list_del(&q->read_buf->stream);
892 err = videobuf_waiton(q->read_buf,
893 file->f_flags & O_NONBLOCK,1);
900 if (q->read_buf->state == STATE_DONE) {
902 /* dirty, undocumented hack -- pass the frame counter
903 * within the last four bytes of each vbi data block.
904 * We need that one to maintain backward compatibility
905 * to all vbi decoding software out there ... */
906 fc = (unsigned int*)q->read_buf->dma.vmalloc;
907 fc += (q->read_buf->size>>2) -1;
908 *fc = q->read_buf->field_count >> 1;
909 dprintk(1,"vbihack: %d\n",*fc);
914 if (bytes > q->read_buf->size - q->read_off)
915 bytes = q->read_buf->size - q->read_off;
916 if (copy_to_user(data + retval,
917 q->read_buf->dma.vmalloc + q->read_off,
925 q->read_off += bytes;
928 q->read_off = q->read_buf->size;
933 /* requeue buffer when done with copying */
934 if (q->read_off == q->read_buf->size) {
935 list_add_tail(&q->read_buf->stream,
937 spin_lock_irqsave(q->irqlock,flags);
938 q->ops->buf_queue(file,q->read_buf);
939 spin_unlock_irqrestore(q->irqlock,flags);
951 unsigned int videobuf_poll_stream(struct file *file,
952 struct videobuf_queue *q,
955 struct videobuf_buffer *buf = NULL;
960 if (!list_empty(&q->stream))
961 buf = list_entry(q->stream.next,
962 struct videobuf_buffer, stream);
965 videobuf_read_start(file,q);
968 } else if (NULL == q->read_buf) {
969 q->read_buf = list_entry(q->stream.next,
970 struct videobuf_buffer,
972 list_del(&q->read_buf->stream);
981 poll_wait(file, &buf->done, wait);
982 if (buf->state == STATE_DONE ||
983 buf->state == STATE_ERROR)
984 rc = POLLIN|POLLRDNORM;
990 /* --------------------------------------------------------------------- */
993 videobuf_vm_open(struct vm_area_struct *vma)
995 struct videobuf_mapping *map = vma->vm_private_data;
997 dprintk(2,"vm_open %p [count=%d,vma=%08lx-%08lx]\n",map,
998 map->count,vma->vm_start,vma->vm_end);
1003 videobuf_vm_close(struct vm_area_struct *vma)
1005 struct videobuf_mapping *map = vma->vm_private_data;
1008 dprintk(2,"vm_close %p [count=%d,vma=%08lx-%08lx]\n",map,
1009 map->count,vma->vm_start,vma->vm_end);
1011 /* down(&fh->lock); FIXME */
1013 if (0 == map->count) {
1014 dprintk(1,"munmap %p\n",map);
1015 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
1016 if (NULL == map->q->bufs[i])
1018 if (map->q->bufs[i])
1020 if (map->q->bufs[i]->map != map)
1022 map->q->bufs[i]->map = NULL;
1023 map->q->bufs[i]->baddr = 0;
1024 map->q->ops->buf_release(vma->vm_file,map->q->bufs[i]);
1028 /* up(&fh->lock); FIXME */
1033 * Get a anonymous page for the mapping. Make sure we can DMA to that
1034 * memory location with 32bit PCI devices (i.e. don't use highmem for
1035 * now ...). Bounce buffers don't work very well for the data rates
1036 * video capture has.
1039 videobuf_vm_nopage(struct vm_area_struct *vma, unsigned long vaddr,
1044 dprintk(3,"nopage: fault @ %08lx [vma %08lx-%08lx]\n",
1045 vaddr,vma->vm_start,vma->vm_end);
1046 if (vaddr > vma->vm_end)
1047 return NOPAGE_SIGBUS;
1048 page = alloc_page(GFP_USER);
1051 clear_user_page(page_address(page), vaddr, page);
1053 *type = VM_FAULT_MINOR;
1057 static struct vm_operations_struct videobuf_vm_ops =
1059 .open = videobuf_vm_open,
1060 .close = videobuf_vm_close,
1061 .nopage = videobuf_vm_nopage,
1064 int videobuf_mmap_setup(struct file *file, struct videobuf_queue *q,
1065 unsigned int bcount, unsigned int bsize,
1066 enum v4l2_memory memory)
1071 err = videobuf_mmap_free(file,q);
1075 for (i = 0; i < bcount; i++) {
1076 q->bufs[i] = videobuf_alloc(q->msize);
1078 q->bufs[i]->memory = memory;
1079 q->bufs[i]->bsize = bsize;
1081 case V4L2_MEMORY_MMAP:
1082 q->bufs[i]->boff = bsize * i;
1084 case V4L2_MEMORY_USERPTR:
1085 case V4L2_MEMORY_OVERLAY:
1090 dprintk(1,"mmap setup: %d buffers, %d bytes each\n",
1095 int videobuf_mmap_free(struct file *file, struct videobuf_queue *q)
1099 for (i = 0; i < VIDEO_MAX_FRAME; i++)
1100 if (q->bufs[i] && q->bufs[i]->map)
1102 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
1103 if (NULL == q->bufs[i])
1105 q->ops->buf_release(file,q->bufs[i]);
1112 int videobuf_mmap_mapper(struct vm_area_struct *vma,
1113 struct videobuf_queue *q)
1115 struct videobuf_mapping *map;
1116 unsigned int first,last,size,i;
1121 if (!(vma->vm_flags & VM_WRITE)) {
1122 dprintk(1,"mmap app bug: PROT_WRITE please\n");
1125 if (!(vma->vm_flags & VM_SHARED)) {
1126 dprintk(1,"mmap app bug: MAP_SHARED please\n");
1130 /* look for first buffer to map */
1131 for (first = 0; first < VIDEO_MAX_FRAME; first++) {
1132 if (NULL == q->bufs[first])
1134 if (V4L2_MEMORY_MMAP != q->bufs[first]->memory)
1136 if (q->bufs[first]->boff == (vma->vm_pgoff << PAGE_SHIFT))
1139 if (VIDEO_MAX_FRAME == first) {
1140 dprintk(1,"mmap app bug: offset invalid [offset=0x%lx]\n",
1141 (vma->vm_pgoff << PAGE_SHIFT));
1145 /* look for last buffer to map */
1146 for (size = 0, last = first; last < VIDEO_MAX_FRAME; last++) {
1147 if (NULL == q->bufs[last])
1149 if (V4L2_MEMORY_MMAP != q->bufs[last]->memory)
1151 if (q->bufs[last]->map) {
1155 size += q->bufs[last]->bsize;
1156 if (size == (vma->vm_end - vma->vm_start))
1159 if (VIDEO_MAX_FRAME == last) {
1160 dprintk(1,"mmap app bug: size invalid [size=0x%lx]\n",
1161 (vma->vm_end - vma->vm_start));
1165 /* create mapping + update buffer list */
1167 map = kmalloc(sizeof(struct videobuf_mapping),GFP_KERNEL);
1170 for (size = 0, i = first; i <= last; size += q->bufs[i++]->bsize) {
1171 q->bufs[i]->map = map;
1172 q->bufs[i]->baddr = vma->vm_start + size;
1175 map->start = vma->vm_start;
1176 map->end = vma->vm_end;
1178 vma->vm_ops = &videobuf_vm_ops;
1179 vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED;
1180 vma->vm_flags &= ~VM_IO; /* using shared anonymous pages */
1181 vma->vm_private_data = map;
1182 dprintk(1,"mmap %p: %08lx-%08lx pgoff %08lx bufs %d-%d\n",
1183 map,vma->vm_start,vma->vm_end,vma->vm_pgoff,first,last);
1191 /* --------------------------------------------------------------------- */
1193 EXPORT_SYMBOL_GPL(videobuf_vmalloc_to_sg);
1195 EXPORT_SYMBOL_GPL(videobuf_dma_init_user);
1196 EXPORT_SYMBOL_GPL(videobuf_dma_init_kernel);
1197 EXPORT_SYMBOL_GPL(videobuf_dma_init_overlay);
1198 EXPORT_SYMBOL_GPL(videobuf_dma_pci_map);
1199 EXPORT_SYMBOL_GPL(videobuf_dma_pci_sync);
1200 EXPORT_SYMBOL_GPL(videobuf_dma_pci_unmap);
1201 EXPORT_SYMBOL_GPL(videobuf_dma_free);
1203 EXPORT_SYMBOL_GPL(videobuf_alloc);
1204 EXPORT_SYMBOL_GPL(videobuf_waiton);
1205 EXPORT_SYMBOL_GPL(videobuf_iolock);
1207 EXPORT_SYMBOL_GPL(videobuf_queue_init);
1208 EXPORT_SYMBOL_GPL(videobuf_queue_cancel);
1209 EXPORT_SYMBOL_GPL(videobuf_queue_is_busy);
1211 EXPORT_SYMBOL_GPL(videobuf_next_field);
1212 EXPORT_SYMBOL_GPL(videobuf_status);
1213 EXPORT_SYMBOL_GPL(videobuf_reqbufs);
1214 EXPORT_SYMBOL_GPL(videobuf_querybuf);
1215 EXPORT_SYMBOL_GPL(videobuf_qbuf);
1216 EXPORT_SYMBOL_GPL(videobuf_dqbuf);
1217 EXPORT_SYMBOL_GPL(videobuf_streamon);
1218 EXPORT_SYMBOL_GPL(videobuf_streamoff);
1220 EXPORT_SYMBOL_GPL(videobuf_read_start);
1221 EXPORT_SYMBOL_GPL(videobuf_read_stop);
1222 EXPORT_SYMBOL_GPL(videobuf_read_stream);
1223 EXPORT_SYMBOL_GPL(videobuf_read_one);
1224 EXPORT_SYMBOL_GPL(videobuf_poll_stream);
1226 EXPORT_SYMBOL_GPL(videobuf_mmap_setup);
1227 EXPORT_SYMBOL_GPL(videobuf_mmap_free);
1228 EXPORT_SYMBOL_GPL(videobuf_mmap_mapper);