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 1.1
9 * as data often must be uncompressed by the drivers).
11 * (c) 2001-2004 Gerd Knorr <kraxel@bytesex.org> [SUSE Labs]
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>
31 #define MAGIC_DMABUF 0x19721112
32 #define MAGIC_BUFFER 0x20040302
33 #define MAGIC_CHECK(is,should) if (unlikely((is) != (should))) \
34 { printk(KERN_ERR "magic mismatch: %x (expected %x)\n",is,should); BUG(); }
38 MODULE_DESCRIPTION("helper module to manage video4linux pci dma buffers");
39 MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
40 MODULE_LICENSE("GPL");
41 MODULE_PARM(debug,"i");
43 #define dprintk(level, fmt, arg...) if (debug >= level) \
44 printk(KERN_DEBUG "vbuf: " fmt , ## arg)
47 videobuf_vmalloc_to_sg(unsigned char *virt, int nr_pages)
49 struct scatterlist *sglist;
53 sglist = kmalloc(sizeof(struct scatterlist)*nr_pages, GFP_KERNEL);
56 memset(sglist,0,sizeof(struct scatterlist)*nr_pages);
57 for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) {
58 pg = vmalloc_to_page(virt);
64 sglist[i].length = PAGE_SIZE;
74 videobuf_pages_to_sg(struct page **pages, int nr_pages, int offset)
76 struct scatterlist *sglist;
81 sglist = kmalloc(sizeof(*sglist) * nr_pages, GFP_KERNEL);
84 memset(sglist, 0, sizeof(*sglist) * nr_pages);
88 if (PageHighMem(pages[0]))
89 /* DMA to highmem pages might not work */
91 sglist[0].page = pages[0];
92 sglist[0].offset = offset;
93 sglist[0].length = PAGE_SIZE - offset;
94 for (i = 1; i < nr_pages; i++) {
97 if (PageHighMem(pages[i]))
99 sglist[i].page = pages[i];
100 sglist[i].length = PAGE_SIZE;
105 dprintk(2,"sgl: oops - no page\n");
110 dprintk(2,"sgl: oops - highmem page\n");
115 /* --------------------------------------------------------------------- */
117 void videobuf_dma_init(struct videobuf_dmabuf *dma)
119 memset(dma,0,sizeof(*dma));
120 dma->magic = MAGIC_DMABUF;
123 int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction,
124 unsigned long data, unsigned long size)
126 unsigned long first,last;
129 dma->direction = direction;
130 switch (dma->direction) {
131 case PCI_DMA_FROMDEVICE: rw = READ; break;
132 case PCI_DMA_TODEVICE: rw = WRITE; break;
136 first = (data & PAGE_MASK) >> PAGE_SHIFT;
137 last = ((data+size-1) & PAGE_MASK) >> PAGE_SHIFT;
138 dma->offset = data & ~PAGE_MASK;
139 dma->nr_pages = last-first+1;
140 dma->pages = kmalloc(dma->nr_pages * sizeof(struct page*),
142 if (NULL == dma->pages)
144 dprintk(1,"init user [0x%lx+0x%lx => %d pages]\n",
145 data,size,dma->nr_pages);
147 down_read(¤t->mm->mmap_sem);
148 err = get_user_pages(current,current->mm,
149 data & PAGE_MASK, dma->nr_pages,
150 rw == READ, 1, /* force */
152 up_read(¤t->mm->mmap_sem);
153 if (err != dma->nr_pages) {
154 dma->nr_pages = (err >= 0) ? err : 0;
155 dprintk(1,"get_user_pages: err=%d [%d]\n",err,dma->nr_pages);
156 return err < 0 ? err : -EINVAL;
161 int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction,
164 dprintk(1,"init kernel [%d pages]\n",nr_pages);
165 dma->direction = direction;
166 dma->vmalloc = vmalloc_32(nr_pages << PAGE_SHIFT);
167 if (NULL == dma->vmalloc) {
168 dprintk(1,"vmalloc_32(%d pages) failed\n",nr_pages);
171 memset(dma->vmalloc,0,nr_pages << PAGE_SHIFT);
172 dma->nr_pages = nr_pages;
176 int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction,
177 dma_addr_t addr, int nr_pages)
179 dprintk(1,"init overlay [%d pages @ bus 0x%lx]\n",
180 nr_pages,(unsigned long)addr);
181 dma->direction = direction;
185 dma->bus_addr = addr;
186 dma->nr_pages = nr_pages;
190 int videobuf_dma_pci_map(struct pci_dev *dev, struct videobuf_dmabuf *dma)
192 MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
193 BUG_ON(0 == dma->nr_pages);
196 dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages,
200 dma->sglist = videobuf_vmalloc_to_sg
201 (dma->vmalloc,dma->nr_pages);
204 dma->sglist = kmalloc(sizeof(struct scatterlist), GFP_KERNEL);
205 if (NULL != dma->sglist) {
207 sg_dma_address(&dma->sglist[0]) = dma->bus_addr & PAGE_MASK;
208 dma->sglist[0].offset = dma->bus_addr & ~PAGE_MASK;
209 sg_dma_len(&dma->sglist[0]) = dma->nr_pages * PAGE_SIZE;
212 if (NULL == dma->sglist) {
213 dprintk(1,"scatterlist is NULL\n");
218 dma->sglen = pci_map_sg(dev,dma->sglist,dma->nr_pages,
223 int videobuf_dma_pci_sync(struct pci_dev *dev, struct videobuf_dmabuf *dma)
225 MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
229 pci_dma_sync_sg_for_cpu(dev,dma->sglist,dma->nr_pages,dma->direction);
233 int videobuf_dma_pci_unmap(struct pci_dev *dev, struct videobuf_dmabuf *dma)
235 MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
240 pci_unmap_sg(dev,dma->sglist,dma->nr_pages,dma->direction);
247 int videobuf_dma_free(struct videobuf_dmabuf *dma)
249 MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
254 for (i=0; i < dma->nr_pages; i++)
255 page_cache_release(dma->pages[i]);
266 dma->direction = PCI_DMA_NONE;
270 /* --------------------------------------------------------------------- */
272 void* videobuf_alloc(unsigned int size)
274 struct videobuf_buffer *vb;
276 vb = kmalloc(size,GFP_KERNEL);
279 videobuf_dma_init(&vb->dma);
280 init_waitqueue_head(&vb->done);
281 vb->magic = MAGIC_BUFFER;
286 int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr)
289 DECLARE_WAITQUEUE(wait, current);
291 MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
292 add_wait_queue(&vb->done, &wait);
293 while (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED) {
298 set_current_state(intr ? TASK_INTERRUPTIBLE
299 : TASK_UNINTERRUPTIBLE);
300 if (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED)
302 set_current_state(TASK_RUNNING);
303 if (intr && signal_pending(current)) {
304 dprintk(1,"buffer waiton: -EINTR\n");
309 remove_wait_queue(&vb->done, &wait);
314 videobuf_iolock(struct pci_dev *pci, struct videobuf_buffer *vb,
315 struct v4l2_framebuffer *fbuf)
320 MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
321 switch (vb->memory) {
322 case V4L2_MEMORY_MMAP:
323 case V4L2_MEMORY_USERPTR:
324 if (0 == vb->baddr) {
325 /* no userspace addr -- kernel bounce buffer */
326 pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
327 err = videobuf_dma_init_kernel(&vb->dma,PCI_DMA_FROMDEVICE,
332 /* dma directly to userspace */
333 err = videobuf_dma_init_user(&vb->dma,PCI_DMA_FROMDEVICE,
334 vb->baddr,vb->bsize);
339 case V4L2_MEMORY_OVERLAY:
342 /* FIXME: need sanity checks for vb->boff */
343 bus = (dma_addr_t)fbuf->base + vb->boff;
344 pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
345 err = videobuf_dma_init_overlay(&vb->dma,PCI_DMA_FROMDEVICE,
353 err = videobuf_dma_pci_map(pci,&vb->dma);
360 /* --------------------------------------------------------------------- */
363 videobuf_queue_init(struct videobuf_queue *q,
364 struct videobuf_queue_ops *ops,
367 enum v4l2_buf_type type,
368 enum v4l2_field field,
371 memset(q,0,sizeof(*q));
373 q->irqlock = irqlock;
380 init_MUTEX(&q->lock);
381 INIT_LIST_HEAD(&q->stream);
385 videobuf_queue_is_busy(struct videobuf_queue *q)
390 dprintk(1,"busy: streaming active\n");
394 dprintk(1,"busy: pending read #1\n");
398 dprintk(1,"busy: pending read #2\n");
401 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
402 if (NULL == q->bufs[i])
404 if (q->bufs[i]->map) {
405 dprintk(1,"busy: buffer #%d mapped\n",i);
408 if (q->bufs[i]->state == STATE_QUEUED) {
409 dprintk(1,"busy: buffer #%d queued\n",i);
412 if (q->bufs[i]->state == STATE_ACTIVE) {
413 dprintk(1,"busy: buffer #%d avtive\n",i);
421 videobuf_queue_cancel(struct file *file, struct videobuf_queue *q)
426 /* remove queued buffers from list */
427 spin_lock_irqsave(q->irqlock,flags);
428 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
429 if (NULL == q->bufs[i])
431 if (q->bufs[i]->state == STATE_QUEUED) {
432 list_del(&q->bufs[i]->queue);
433 q->bufs[i]->state = STATE_ERROR;
436 spin_unlock_irqrestore(q->irqlock,flags);
438 /* free all buffers + clear queue */
439 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
440 if (NULL == q->bufs[i])
442 q->ops->buf_release(file,q->bufs[i]);
444 INIT_LIST_HEAD(&q->stream);
447 /* --------------------------------------------------------------------- */
450 videobuf_next_field(struct videobuf_queue *q)
452 enum v4l2_field field = q->field;
454 BUG_ON(V4L2_FIELD_ANY == field);
456 if (V4L2_FIELD_ALTERNATE == field) {
457 if (V4L2_FIELD_TOP == q->last) {
458 field = V4L2_FIELD_BOTTOM;
459 q->last = V4L2_FIELD_BOTTOM;
461 field = V4L2_FIELD_TOP;
462 q->last = V4L2_FIELD_TOP;
469 videobuf_status(struct v4l2_buffer *b, struct videobuf_buffer *vb,
470 enum v4l2_buf_type type)
472 MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
477 b->memory = vb->memory;
479 case V4L2_MEMORY_MMAP:
480 b->m.offset = vb->boff;
481 b->length = vb->bsize;
483 case V4L2_MEMORY_USERPTR:
484 b->m.userptr = vb->baddr;
485 b->length = vb->bsize;
487 case V4L2_MEMORY_OVERLAY:
488 b->m.offset = vb->boff;
494 b->flags |= V4L2_BUF_FLAG_MAPPED;
500 b->flags |= V4L2_BUF_FLAG_QUEUED;
504 b->flags |= V4L2_BUF_FLAG_DONE;
506 case STATE_NEEDS_INIT:
512 if (vb->input != UNSET) {
513 b->flags |= V4L2_BUF_FLAG_INPUT;
514 b->input = vb->input;
517 b->field = vb->field;
518 b->timestamp = vb->ts;
519 b->bytesused = vb->size;
520 b->sequence = vb->field_count >> 1;
524 videobuf_reqbufs(struct file *file, struct videobuf_queue *q,
525 struct v4l2_requestbuffers *req)
527 unsigned int size,count;
530 if (req->type != q->type)
534 if (req->memory != V4L2_MEMORY_MMAP &&
535 req->memory != V4L2_MEMORY_USERPTR &&
536 req->memory != V4L2_MEMORY_OVERLAY)
541 if (!list_empty(&q->stream))
546 if (count > VIDEO_MAX_FRAME)
547 count = VIDEO_MAX_FRAME;
549 q->ops->buf_setup(file,&count,&size);
550 size = PAGE_ALIGN(size);
551 dprintk(1,"reqbufs: bufs=%d, size=0x%x [%d pages total]\n",
552 count, size, (count*size)>>PAGE_SHIFT);
554 retval = videobuf_mmap_setup(file,q,count,size,req->memory);
566 videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b)
568 if (unlikely(b->type != q->type))
570 if (unlikely(b->index < 0 || b->index >= VIDEO_MAX_FRAME))
572 if (unlikely(NULL == q->bufs[b->index]))
574 videobuf_status(b,q->bufs[b->index],q->type);
579 videobuf_qbuf(struct file *file, struct videobuf_queue *q,
580 struct v4l2_buffer *b)
582 struct videobuf_buffer *buf;
583 enum v4l2_field field;
592 if (b->type != q->type)
594 if (b->index < 0 || b->index >= VIDEO_MAX_FRAME)
596 buf = q->bufs[b->index];
599 MAGIC_CHECK(buf->magic,MAGIC_BUFFER);
600 if (buf->memory != b->memory)
602 if (buf->state == STATE_QUEUED ||
603 buf->state == STATE_ACTIVE)
606 if (b->flags & V4L2_BUF_FLAG_INPUT) {
607 if (b->input >= q->inputs)
609 buf->input = b->input;
615 case V4L2_MEMORY_MMAP:
619 case V4L2_MEMORY_USERPTR:
620 if (b->length < buf->bsize)
622 if (STATE_NEEDS_INIT != buf->state && buf->baddr != b->m.userptr)
623 q->ops->buf_release(file,buf);
624 buf->baddr = b->m.userptr;
626 case V4L2_MEMORY_OVERLAY:
627 buf->boff = b->m.offset;
633 field = videobuf_next_field(q);
634 retval = q->ops->buf_prepare(file,buf,field);
638 list_add_tail(&buf->stream,&q->stream);
640 spin_lock_irqsave(q->irqlock,flags);
641 q->ops->buf_queue(file,buf);
642 spin_unlock_irqrestore(q->irqlock,flags);
652 videobuf_dqbuf(struct file *file, struct videobuf_queue *q,
653 struct v4l2_buffer *b)
655 struct videobuf_buffer *buf;
663 if (b->type != q->type)
665 if (list_empty(&q->stream))
667 buf = list_entry(q->stream.next, struct videobuf_buffer, stream);
668 retval = videobuf_waiton(buf, file->f_flags & O_NONBLOCK, 1);
671 switch (buf->state) {
676 videobuf_dma_pci_sync(q->pci,&buf->dma);
677 buf->state = STATE_IDLE;
683 list_del(&buf->stream);
684 memset(b,0,sizeof(*b));
685 videobuf_status(b,buf,q->type);
692 int videobuf_streamon(struct file *file, struct videobuf_queue *q)
694 struct videobuf_buffer *buf;
695 struct list_head *list;
707 spin_lock_irqsave(q->irqlock,flags);
708 list_for_each(list,&q->stream) {
709 buf = list_entry(list, struct videobuf_buffer, stream);
710 if (buf->state == STATE_PREPARED)
711 q->ops->buf_queue(file,buf);
713 spin_unlock_irqrestore(q->irqlock,flags);
720 int videobuf_streamoff(struct file *file, struct videobuf_queue *q)
722 int retval = -EINVAL;
727 videobuf_queue_cancel(file,q);
737 videobuf_read_zerocopy(struct file *file, struct videobuf_queue *q,
738 char __user *data, size_t count, loff_t *ppos)
740 enum v4l2_field field;
746 q->read_buf = videobuf_alloc(q->msize);
747 if (NULL == q->read_buf)
750 q->read_buf->memory = V4L2_MEMORY_USERPTR;
751 q->read_buf->baddr = (unsigned long)data;
752 q->read_buf->bsize = count;
753 field = videobuf_next_field(q);
754 retval = q->ops->buf_prepare(file,q->read_buf,field);
758 /* start capture & wait */
759 spin_lock_irqsave(q->irqlock,flags);
760 q->ops->buf_queue(file,q->read_buf);
761 spin_unlock_irqrestore(q->irqlock,flags);
762 retval = videobuf_waiton(q->read_buf,0,0);
764 videobuf_dma_pci_sync(q->pci,&q->read_buf->dma);
765 if (STATE_ERROR == q->read_buf->state)
768 retval = q->read_buf->size;
773 q->ops->buf_release(file,q->read_buf);
779 ssize_t videobuf_read_one(struct file *file, struct videobuf_queue *q,
780 char __user *data, size_t count, loff_t *ppos)
782 enum v4l2_field field;
784 unsigned size, nbufs, bytes;
790 q->ops->buf_setup(file,&nbufs,&size);
791 if (NULL == q->read_buf &&
793 !(file->f_flags & O_NONBLOCK)) {
794 retval = videobuf_read_zerocopy(file,q,data,count,ppos);
795 if (retval >= 0 || retval == -EIO)
798 /* fallback to kernel bounce buffer on failures */
801 if (NULL == q->read_buf) {
802 /* need to capture a new frame */
804 q->read_buf = videobuf_alloc(q->msize);
805 if (NULL == q->read_buf)
807 q->read_buf->memory = V4L2_MEMORY_USERPTR;
808 field = videobuf_next_field(q);
809 retval = q->ops->buf_prepare(file,q->read_buf,field);
812 spin_lock_irqsave(q->irqlock,flags);
813 q->ops->buf_queue(file,q->read_buf);
814 spin_unlock_irqrestore(q->irqlock,flags);
818 /* wait until capture is done */
819 retval = videobuf_waiton(q->read_buf, file->f_flags & O_NONBLOCK, 1);
822 videobuf_dma_pci_sync(q->pci,&q->read_buf->dma);
824 if (STATE_ERROR == q->read_buf->state) {
825 /* catch I/O errors */
826 q->ops->buf_release(file,q->read_buf);
833 /* copy to userspace */
835 if (bytes > q->read_buf->size - q->read_off)
836 bytes = q->read_buf->size - q->read_off;
838 if (copy_to_user(data, q->read_buf->dma.vmalloc+q->read_off, bytes))
842 q->read_off += bytes;
843 if (q->read_off == q->read_buf->size) {
844 /* all data copied, cleanup */
845 q->ops->buf_release(file,q->read_buf);
855 int videobuf_read_start(struct file *file, struct videobuf_queue *q)
857 enum v4l2_field field;
859 int count = 0, size = 0;
862 q->ops->buf_setup(file,&count,&size);
865 if (count > VIDEO_MAX_FRAME)
866 count = VIDEO_MAX_FRAME;
867 size = PAGE_ALIGN(size);
869 err = videobuf_mmap_setup(file, q, count, size, V4L2_MEMORY_USERPTR);
872 for (i = 0; i < count; i++) {
873 field = videobuf_next_field(q);
874 err = q->ops->buf_prepare(file,q->bufs[i],field);
877 list_add_tail(&q->bufs[i]->stream, &q->stream);
879 spin_lock_irqsave(q->irqlock,flags);
880 for (i = 0; i < count; i++)
881 q->ops->buf_queue(file,q->bufs[i]);
882 spin_unlock_irqrestore(q->irqlock,flags);
887 void videobuf_read_stop(struct file *file, struct videobuf_queue *q)
891 videobuf_queue_cancel(file,q);
892 INIT_LIST_HEAD(&q->stream);
893 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
894 if (NULL == q->bufs[i])
903 ssize_t videobuf_read_stream(struct file *file, struct videobuf_queue *q,
904 char __user *data, size_t count, loff_t *ppos,
907 unsigned int *fc, bytes;
916 retval = videobuf_read_start(file,q);
923 /* get / wait for data */
924 if (NULL == q->read_buf) {
925 q->read_buf = list_entry(q->stream.next,
926 struct videobuf_buffer,
928 list_del(&q->read_buf->stream);
931 err = videobuf_waiton(q->read_buf,
932 file->f_flags & O_NONBLOCK,1);
939 if (q->read_buf->state == STATE_DONE) {
941 /* dirty, undocumented hack -- pass the frame counter
942 * within the last four bytes of each vbi data block.
943 * We need that one to maintain backward compatibility
944 * to all vbi decoding software out there ... */
945 fc = (unsigned int*)q->read_buf->dma.vmalloc;
946 fc += (q->read_buf->size>>2) -1;
947 *fc = q->read_buf->field_count >> 1;
948 dprintk(1,"vbihack: %d\n",*fc);
953 if (bytes > q->read_buf->size - q->read_off)
954 bytes = q->read_buf->size - q->read_off;
955 if (copy_to_user(data + retval,
956 q->read_buf->dma.vmalloc + q->read_off,
964 q->read_off += bytes;
967 q->read_off = q->read_buf->size;
972 /* requeue buffer when done with copying */
973 if (q->read_off == q->read_buf->size) {
974 list_add_tail(&q->read_buf->stream,
976 spin_lock_irqsave(q->irqlock,flags);
977 q->ops->buf_queue(file,q->read_buf);
978 spin_unlock_irqrestore(q->irqlock,flags);
990 unsigned int videobuf_poll_stream(struct file *file,
991 struct videobuf_queue *q,
994 struct videobuf_buffer *buf = NULL;
999 if (!list_empty(&q->stream))
1000 buf = list_entry(q->stream.next,
1001 struct videobuf_buffer, stream);
1004 videobuf_read_start(file,q);
1007 } else if (NULL == q->read_buf) {
1008 q->read_buf = list_entry(q->stream.next,
1009 struct videobuf_buffer,
1011 list_del(&q->read_buf->stream);
1020 poll_wait(file, &buf->done, wait);
1021 if (buf->state == STATE_DONE ||
1022 buf->state == STATE_ERROR)
1023 rc = POLLIN|POLLRDNORM;
1029 /* --------------------------------------------------------------------- */
1032 videobuf_vm_open(struct vm_area_struct *vma)
1034 struct videobuf_mapping *map = vma->vm_private_data;
1036 dprintk(2,"vm_open %p [count=%d,vma=%08lx-%08lx]\n",map,
1037 map->count,vma->vm_start,vma->vm_end);
1042 videobuf_vm_close(struct vm_area_struct *vma)
1044 struct videobuf_mapping *map = vma->vm_private_data;
1047 dprintk(2,"vm_close %p [count=%d,vma=%08lx-%08lx]\n",map,
1048 map->count,vma->vm_start,vma->vm_end);
1050 /* down(&fh->lock); FIXME */
1052 if (0 == map->count) {
1053 dprintk(1,"munmap %p\n",map);
1054 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
1055 if (NULL == map->q->bufs[i])
1057 if (map->q->bufs[i])
1059 if (map->q->bufs[i]->map != map)
1061 map->q->bufs[i]->map = NULL;
1062 map->q->bufs[i]->baddr = 0;
1063 map->q->ops->buf_release(vma->vm_file,map->q->bufs[i]);
1067 /* up(&fh->lock); FIXME */
1072 * Get a anonymous page for the mapping. Make sure we can DMA to that
1073 * memory location with 32bit PCI devices (i.e. don't use highmem for
1074 * now ...). Bounce buffers don't work very well for the data rates
1075 * video capture has.
1078 videobuf_vm_nopage(struct vm_area_struct *vma, unsigned long vaddr,
1083 dprintk(3,"nopage: fault @ %08lx [vma %08lx-%08lx]\n",
1084 vaddr,vma->vm_start,vma->vm_end);
1085 if (vaddr > vma->vm_end)
1086 return NOPAGE_SIGBUS;
1087 page = alloc_page(GFP_USER);
1090 clear_user_page(page_address(page), vaddr, page);
1092 *type = VM_FAULT_MINOR;
1096 static struct vm_operations_struct videobuf_vm_ops =
1098 .open = videobuf_vm_open,
1099 .close = videobuf_vm_close,
1100 .nopage = videobuf_vm_nopage,
1103 int videobuf_mmap_setup(struct file *file, struct videobuf_queue *q,
1104 unsigned int bcount, unsigned int bsize,
1105 enum v4l2_memory memory)
1110 err = videobuf_mmap_free(file,q);
1114 for (i = 0; i < bcount; i++) {
1115 q->bufs[i] = videobuf_alloc(q->msize);
1117 q->bufs[i]->input = UNSET;
1118 q->bufs[i]->memory = memory;
1119 q->bufs[i]->bsize = bsize;
1121 case V4L2_MEMORY_MMAP:
1122 q->bufs[i]->boff = bsize * i;
1124 case V4L2_MEMORY_USERPTR:
1125 case V4L2_MEMORY_OVERLAY:
1130 dprintk(1,"mmap setup: %d buffers, %d bytes each\n",
1135 int videobuf_mmap_free(struct file *file, struct videobuf_queue *q)
1139 for (i = 0; i < VIDEO_MAX_FRAME; i++)
1140 if (q->bufs[i] && q->bufs[i]->map)
1142 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
1143 if (NULL == q->bufs[i])
1145 q->ops->buf_release(file,q->bufs[i]);
1152 int videobuf_mmap_mapper(struct vm_area_struct *vma,
1153 struct videobuf_queue *q)
1155 struct videobuf_mapping *map;
1156 unsigned int first,last,size,i;
1161 if (!(vma->vm_flags & VM_WRITE)) {
1162 dprintk(1,"mmap app bug: PROT_WRITE please\n");
1165 if (!(vma->vm_flags & VM_SHARED)) {
1166 dprintk(1,"mmap app bug: MAP_SHARED please\n");
1170 /* look for first buffer to map */
1171 for (first = 0; first < VIDEO_MAX_FRAME; first++) {
1172 if (NULL == q->bufs[first])
1174 if (V4L2_MEMORY_MMAP != q->bufs[first]->memory)
1176 if (q->bufs[first]->boff == (vma->vm_pgoff << PAGE_SHIFT))
1179 if (VIDEO_MAX_FRAME == first) {
1180 dprintk(1,"mmap app bug: offset invalid [offset=0x%lx]\n",
1181 (vma->vm_pgoff << PAGE_SHIFT));
1185 /* look for last buffer to map */
1186 for (size = 0, last = first; last < VIDEO_MAX_FRAME; last++) {
1187 if (NULL == q->bufs[last])
1189 if (V4L2_MEMORY_MMAP != q->bufs[last]->memory)
1191 if (q->bufs[last]->map) {
1195 size += q->bufs[last]->bsize;
1196 if (size == (vma->vm_end - vma->vm_start))
1199 if (VIDEO_MAX_FRAME == last) {
1200 dprintk(1,"mmap app bug: size invalid [size=0x%lx]\n",
1201 (vma->vm_end - vma->vm_start));
1205 /* create mapping + update buffer list */
1207 map = kmalloc(sizeof(struct videobuf_mapping),GFP_KERNEL);
1210 for (size = 0, i = first; i <= last; size += q->bufs[i++]->bsize) {
1211 q->bufs[i]->map = map;
1212 q->bufs[i]->baddr = vma->vm_start + size;
1215 map->start = vma->vm_start;
1216 map->end = vma->vm_end;
1218 vma->vm_ops = &videobuf_vm_ops;
1219 vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED;
1220 vma->vm_flags &= ~VM_IO; /* using shared anonymous pages */
1221 vma->vm_private_data = map;
1222 dprintk(1,"mmap %p: %08lx-%08lx pgoff %08lx bufs %d-%d\n",
1223 map,vma->vm_start,vma->vm_end,vma->vm_pgoff,first,last);
1231 /* --------------------------------------------------------------------- */
1233 EXPORT_SYMBOL_GPL(videobuf_vmalloc_to_sg);
1235 EXPORT_SYMBOL_GPL(videobuf_dma_init);
1236 EXPORT_SYMBOL_GPL(videobuf_dma_init_user);
1237 EXPORT_SYMBOL_GPL(videobuf_dma_init_kernel);
1238 EXPORT_SYMBOL_GPL(videobuf_dma_init_overlay);
1239 EXPORT_SYMBOL_GPL(videobuf_dma_pci_map);
1240 EXPORT_SYMBOL_GPL(videobuf_dma_pci_sync);
1241 EXPORT_SYMBOL_GPL(videobuf_dma_pci_unmap);
1242 EXPORT_SYMBOL_GPL(videobuf_dma_free);
1244 EXPORT_SYMBOL_GPL(videobuf_alloc);
1245 EXPORT_SYMBOL_GPL(videobuf_waiton);
1246 EXPORT_SYMBOL_GPL(videobuf_iolock);
1248 EXPORT_SYMBOL_GPL(videobuf_queue_init);
1249 EXPORT_SYMBOL_GPL(videobuf_queue_cancel);
1250 EXPORT_SYMBOL_GPL(videobuf_queue_is_busy);
1252 EXPORT_SYMBOL_GPL(videobuf_next_field);
1253 EXPORT_SYMBOL_GPL(videobuf_status);
1254 EXPORT_SYMBOL_GPL(videobuf_reqbufs);
1255 EXPORT_SYMBOL_GPL(videobuf_querybuf);
1256 EXPORT_SYMBOL_GPL(videobuf_qbuf);
1257 EXPORT_SYMBOL_GPL(videobuf_dqbuf);
1258 EXPORT_SYMBOL_GPL(videobuf_streamon);
1259 EXPORT_SYMBOL_GPL(videobuf_streamoff);
1261 EXPORT_SYMBOL_GPL(videobuf_read_start);
1262 EXPORT_SYMBOL_GPL(videobuf_read_stop);
1263 EXPORT_SYMBOL_GPL(videobuf_read_stream);
1264 EXPORT_SYMBOL_GPL(videobuf_read_one);
1265 EXPORT_SYMBOL_GPL(videobuf_poll_stream);
1267 EXPORT_SYMBOL_GPL(videobuf_mmap_setup);
1268 EXPORT_SYMBOL_GPL(videobuf_mmap_free);
1269 EXPORT_SYMBOL_GPL(videobuf_mmap_mapper);