/*
+ * $Id: video-buf.c,v 1.17 2004/12/10 12:33:40 kraxel Exp $
+ *
* generic helper functions for video4linux capture buffers, to handle
* memory management and PCI DMA. Right now bttv + saa7134 use it.
*
* The functions expect the hardware being able to scatter gatter
* (i.e. the buffers are not linear in physical memory, but fragmented
* into PAGE_SIZE chunks). They also assume the driver does not need
- * to touch the video data (thus it is probably not useful for USB as
- * data often must be uncompressed by the drivers).
- *
- * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org>
+ * to touch the video data (thus it is probably not useful for USB 1.1
+ * as data often must be uncompressed by the drivers).
+ *
+ * (c) 2001-2004 Gerd Knorr <kraxel@bytesex.org> [SUSE Labs]
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
#include <linux/init.h>
#include <linux/module.h>
+#include <linux/moduleparam.h>
#include <linux/vmalloc.h>
#include <linux/pagemap.h>
#include <linux/slab.h>
#include <media/video-buf.h>
+#define MAGIC_DMABUF 0x19721112
+#define MAGIC_BUFFER 0x20040302
+#define MAGIC_CHECK(is,should) if (unlikely((is) != (should))) \
+ { printk(KERN_ERR "magic mismatch: %x (expected %x)\n",is,should); BUG(); }
+
static int debug = 0;
+module_param(debug, int, 0644);
MODULE_DESCRIPTION("helper module to manage video4linux pci dma buffers");
MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
MODULE_LICENSE("GPL");
-MODULE_PARM(debug,"i");
#define dprintk(level, fmt, arg...) if (debug >= level) \
printk(KERN_DEBUG "vbuf: " fmt , ## arg)
sglist[i].length = PAGE_SIZE;
}
return sglist;
-
+
err:
kfree(sglist);
return NULL;
/* --------------------------------------------------------------------- */
+void videobuf_dma_init(struct videobuf_dmabuf *dma)
+{
+ memset(dma,0,sizeof(*dma));
+ dma->magic = MAGIC_DMABUF;
+}
+
int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction,
unsigned long data, unsigned long size)
{
int videobuf_dma_pci_map(struct pci_dev *dev, struct videobuf_dmabuf *dma)
{
- if (0 == dma->nr_pages)
- BUG();
-
+ MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
+ BUG_ON(0 == dma->nr_pages);
+
if (dma->pages) {
dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages,
dma->offset);
int videobuf_dma_pci_sync(struct pci_dev *dev, struct videobuf_dmabuf *dma)
{
- if (!dma->sglen)
- BUG();
+ MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
+ BUG_ON(!dma->sglen);
if (!dma->bus_addr)
pci_dma_sync_sg_for_cpu(dev,dma->sglist,dma->nr_pages,dma->direction);
int videobuf_dma_pci_unmap(struct pci_dev *dev, struct videobuf_dmabuf *dma)
{
+ MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
if (!dma->sglen)
return 0;
int videobuf_dma_free(struct videobuf_dmabuf *dma)
{
- if (dma->sglen)
- BUG();
+ MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
+ BUG_ON(dma->sglen);
if (dma->pages) {
int i;
vb = kmalloc(size,GFP_KERNEL);
if (NULL != vb) {
memset(vb,0,size);
+ videobuf_dma_init(&vb->dma);
init_waitqueue_head(&vb->done);
+ vb->magic = MAGIC_BUFFER;
}
return vb;
}
{
int retval = 0;
DECLARE_WAITQUEUE(wait, current);
-
+
+ MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
add_wait_queue(&vb->done, &wait);
while (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED) {
if (non_blocking) {
int err,pages;
dma_addr_t bus;
+ MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
switch (vb->memory) {
case V4L2_MEMORY_MMAP:
case V4L2_MEMORY_USERPTR:
err = videobuf_dma_pci_map(pci,&vb->dma);
if (0 != err)
return err;
-
+
return 0;
}
/* --------------------------------------------------------------------- */
-void
-videobuf_queue_init(struct videobuf_queue *q,
- struct videobuf_queue_ops *ops,
- struct pci_dev *pci,
- spinlock_t *irqlock,
- enum v4l2_buf_type type,
- enum v4l2_field field,
- unsigned int msize)
+void videobuf_queue_init(struct videobuf_queue* q,
+ struct videobuf_queue_ops *ops,
+ struct pci_dev *pci,
+ spinlock_t *irqlock,
+ enum v4l2_buf_type type,
+ enum v4l2_field field,
+ unsigned int msize,
+ void *priv)
{
memset(q,0,sizeof(*q));
-
q->irqlock = irqlock;
q->pci = pci;
q->type = type;
q->field = field;
q->msize = msize;
q->ops = ops;
+ q->priv_data = priv;
init_MUTEX(&q->lock);
INIT_LIST_HEAD(&q->stream);
}
-int
+int
videobuf_queue_is_busy(struct videobuf_queue *q)
{
int i;
-
+
if (q->streaming) {
dprintk(1,"busy: streaming active\n");
return 1;
}
void
-videobuf_queue_cancel(struct file *file, struct videobuf_queue *q)
+videobuf_queue_cancel(struct videobuf_queue *q)
{
unsigned long flags;
int i;
for (i = 0; i < VIDEO_MAX_FRAME; i++) {
if (NULL == q->bufs[i])
continue;
- q->ops->buf_release(file,q->bufs[i]);
+ q->ops->buf_release(q,q->bufs[i]);
}
INIT_LIST_HEAD(&q->stream);
}
videobuf_status(struct v4l2_buffer *b, struct videobuf_buffer *vb,
enum v4l2_buf_type type)
{
+ MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
+
b->index = vb->i;
b->type = type;
break;
}
+ if (vb->input != UNSET) {
+ b->flags |= V4L2_BUF_FLAG_INPUT;
+ b->input = vb->input;
+ }
+
b->field = vb->field;
b->timestamp = vb->ts;
b->bytesused = vb->size;
}
int
-videobuf_reqbufs(struct file *file, struct videobuf_queue *q,
+videobuf_reqbufs(struct videobuf_queue *q,
struct v4l2_requestbuffers *req)
{
unsigned int size,count;
req->memory != V4L2_MEMORY_OVERLAY)
return -EINVAL;
+ if (q->streaming)
+ return -EBUSY;
+ if (!list_empty(&q->stream))
+ return -EBUSY;
+
down(&q->lock);
count = req->count;
if (count > VIDEO_MAX_FRAME)
count = VIDEO_MAX_FRAME;
size = 0;
- q->ops->buf_setup(file,&count,&size);
+ q->ops->buf_setup(q,&count,&size);
size = PAGE_ALIGN(size);
dprintk(1,"reqbufs: bufs=%d, size=0x%x [%d pages total]\n",
count, size, (count*size)>>PAGE_SHIFT);
- retval = videobuf_mmap_setup(file,q,count,size,req->memory);
+ retval = videobuf_mmap_setup(q,count,size,req->memory);
if (retval < 0)
goto done;
}
int
-videobuf_qbuf(struct file *file, struct videobuf_queue *q,
+videobuf_qbuf(struct videobuf_queue *q,
struct v4l2_buffer *b)
{
struct videobuf_buffer *buf;
buf = q->bufs[b->index];
if (NULL == buf)
goto done;
+ MAGIC_CHECK(buf->magic,MAGIC_BUFFER);
if (buf->memory != b->memory)
goto done;
if (buf->state == STATE_QUEUED ||
buf->state == STATE_ACTIVE)
goto done;
+ if (b->flags & V4L2_BUF_FLAG_INPUT) {
+ if (b->input >= q->inputs)
+ goto done;
+ buf->input = b->input;
+ } else {
+ buf->input = UNSET;
+ }
+
switch (b->memory) {
case V4L2_MEMORY_MMAP:
if (0 == buf->baddr)
case V4L2_MEMORY_USERPTR:
if (b->length < buf->bsize)
goto done;
+ if (STATE_NEEDS_INIT != buf->state && buf->baddr != b->m.userptr)
+ q->ops->buf_release(q,buf);
buf->baddr = b->m.userptr;
break;
case V4L2_MEMORY_OVERLAY:
}
field = videobuf_next_field(q);
- retval = q->ops->buf_prepare(file,buf,field);
+ retval = q->ops->buf_prepare(q,buf,field);
if (0 != retval)
goto done;
-
+
list_add_tail(&buf->stream,&q->stream);
if (q->streaming) {
spin_lock_irqsave(q->irqlock,flags);
- q->ops->buf_queue(file,buf);
+ q->ops->buf_queue(q,buf);
spin_unlock_irqrestore(q->irqlock,flags);
}
retval = 0;
-
+
done:
up(&q->lock);
return retval;
}
int
-videobuf_dqbuf(struct file *file, struct videobuf_queue *q,
- struct v4l2_buffer *b)
+videobuf_dqbuf(struct videobuf_queue *q,
+ struct v4l2_buffer *b, int nonblocking)
{
struct videobuf_buffer *buf;
int retval;
-
+
down(&q->lock);
retval = -EBUSY;
if (q->reading)
if (list_empty(&q->stream))
goto done;
buf = list_entry(q->stream.next, struct videobuf_buffer, stream);
- retval = videobuf_waiton(buf, file->f_flags & O_NONBLOCK, 1);
+ retval = videobuf_waiton(buf, nonblocking, 1);
if (retval < 0)
goto done;
switch (buf->state) {
return retval;
}
-int videobuf_streamon(struct file *file, struct videobuf_queue *q)
+int videobuf_streamon(struct videobuf_queue *q)
{
struct videobuf_buffer *buf;
struct list_head *list;
unsigned long flags;
int retval;
-
+
down(&q->lock);
retval = -EBUSY;
if (q->reading)
list_for_each(list,&q->stream) {
buf = list_entry(list, struct videobuf_buffer, stream);
if (buf->state == STATE_PREPARED)
- q->ops->buf_queue(file,buf);
+ q->ops->buf_queue(q,buf);
}
spin_unlock_irqrestore(q->irqlock,flags);
return retval;
}
-int videobuf_streamoff(struct file *file, struct videobuf_queue *q)
+int videobuf_streamoff(struct videobuf_queue *q)
{
int retval = -EINVAL;
down(&q->lock);
if (!q->streaming)
goto done;
- videobuf_queue_cancel(file,q);
+ videobuf_queue_cancel(q);
q->streaming = 0;
retval = 0;
}
static ssize_t
-videobuf_read_zerocopy(struct file *file, struct videobuf_queue *q,
- char *data, size_t count, loff_t *ppos)
+videobuf_read_zerocopy(struct videobuf_queue *q, char __user *data,
+ size_t count, loff_t *ppos)
{
enum v4l2_field field;
unsigned long flags;
q->read_buf->baddr = (unsigned long)data;
q->read_buf->bsize = count;
field = videobuf_next_field(q);
- retval = q->ops->buf_prepare(file,q->read_buf,field);
+ retval = q->ops->buf_prepare(q,q->read_buf,field);
if (0 != retval)
goto done;
-
+
/* start capture & wait */
spin_lock_irqsave(q->irqlock,flags);
- q->ops->buf_queue(file,q->read_buf);
+ q->ops->buf_queue(q,q->read_buf);
spin_unlock_irqrestore(q->irqlock,flags);
retval = videobuf_waiton(q->read_buf,0,0);
if (0 == retval) {
done:
/* cleanup */
- q->ops->buf_release(file,q->read_buf);
+ q->ops->buf_release(q,q->read_buf);
kfree(q->read_buf);
q->read_buf = NULL;
return retval;
}
-ssize_t videobuf_read_one(struct file *file, struct videobuf_queue *q,
- char *data, size_t count, loff_t *ppos)
+ssize_t videobuf_read_one(struct videobuf_queue *q,
+ char __user *data, size_t count, loff_t *ppos,
+ int nonblocking)
{
enum v4l2_field field;
unsigned long flags;
down(&q->lock);
nbufs = 1; size = 0;
- q->ops->buf_setup(file,&nbufs,&size);
+ q->ops->buf_setup(q,&nbufs,&size);
if (NULL == q->read_buf &&
count >= size &&
- !(file->f_flags & O_NONBLOCK)) {
- retval = videobuf_read_zerocopy(file,q,data,count,ppos);
+ !nonblocking) {
+ retval = videobuf_read_zerocopy(q,data,count,ppos);
if (retval >= 0 || retval == -EIO)
/* ok, all done */
goto done;
goto done;
q->read_buf->memory = V4L2_MEMORY_USERPTR;
field = videobuf_next_field(q);
- retval = q->ops->buf_prepare(file,q->read_buf,field);
+ retval = q->ops->buf_prepare(q,q->read_buf,field);
if (0 != retval)
goto done;
spin_lock_irqsave(q->irqlock,flags);
- q->ops->buf_queue(file,q->read_buf);
+ q->ops->buf_queue(q,q->read_buf);
spin_unlock_irqrestore(q->irqlock,flags);
q->read_off = 0;
}
/* wait until capture is done */
- retval = videobuf_waiton(q->read_buf, file->f_flags & O_NONBLOCK, 1);
+ retval = videobuf_waiton(q->read_buf, nonblocking, 1);
if (0 != retval)
goto done;
videobuf_dma_pci_sync(q->pci,&q->read_buf->dma);
if (STATE_ERROR == q->read_buf->state) {
/* catch I/O errors */
- q->ops->buf_release(file,q->read_buf);
+ q->ops->buf_release(q,q->read_buf);
kfree(q->read_buf);
q->read_buf = NULL;
retval = -EIO;
q->read_off += bytes;
if (q->read_off == q->read_buf->size) {
/* all data copied, cleanup */
- q->ops->buf_release(file,q->read_buf);
+ q->ops->buf_release(q,q->read_buf);
kfree(q->read_buf);
q->read_buf = NULL;
}
return retval;
}
-int videobuf_read_start(struct file *file, struct videobuf_queue *q)
+int videobuf_read_start(struct videobuf_queue *q)
{
enum v4l2_field field;
unsigned long flags;
int count = 0, size = 0;
int err, i;
- q->ops->buf_setup(file,&count,&size);
+ q->ops->buf_setup(q,&count,&size);
if (count < 2)
count = 2;
if (count > VIDEO_MAX_FRAME)
count = VIDEO_MAX_FRAME;
size = PAGE_ALIGN(size);
- err = videobuf_mmap_setup(file, q, count, size, V4L2_MEMORY_USERPTR);
+ err = videobuf_mmap_setup(q, count, size, V4L2_MEMORY_USERPTR);
if (err)
return err;
for (i = 0; i < count; i++) {
field = videobuf_next_field(q);
- err = q->ops->buf_prepare(file,q->bufs[i],field);
+ err = q->ops->buf_prepare(q,q->bufs[i],field);
if (err)
return err;
list_add_tail(&q->bufs[i]->stream, &q->stream);
}
spin_lock_irqsave(q->irqlock,flags);
for (i = 0; i < count; i++)
- q->ops->buf_queue(file,q->bufs[i]);
+ q->ops->buf_queue(q,q->bufs[i]);
spin_unlock_irqrestore(q->irqlock,flags);
q->reading = 1;
return 0;
}
-void videobuf_read_stop(struct file *file, struct videobuf_queue *q)
+void videobuf_read_stop(struct videobuf_queue *q)
{
int i;
-
- videobuf_queue_cancel(file,q);
+
+ videobuf_queue_cancel(q);
+ videobuf_mmap_free(q);
INIT_LIST_HEAD(&q->stream);
for (i = 0; i < VIDEO_MAX_FRAME; i++) {
if (NULL == q->bufs[i])
q->reading = 0;
}
-ssize_t videobuf_read_stream(struct file *file, struct videobuf_queue *q,
- char *data, size_t count, loff_t *ppos,
- int vbihack)
+ssize_t videobuf_read_stream(struct videobuf_queue *q,
+ char __user *data, size_t count, loff_t *ppos,
+ int vbihack, int nonblocking)
{
unsigned int *fc, bytes;
int err, retval;
unsigned long flags;
-
+
+ dprintk(2,"%s\n",__FUNCTION__);
down(&q->lock);
retval = -EBUSY;
if (q->streaming)
goto done;
if (!q->reading) {
- retval = videobuf_read_start(file,q);
+ retval = videobuf_read_start(q);
if (retval < 0)
goto done;
}
list_del(&q->read_buf->stream);
q->read_off = 0;
}
- err = videobuf_waiton(q->read_buf,
- file->f_flags & O_NONBLOCK,1);
+ err = videobuf_waiton(q->read_buf, nonblocking, 1);
if (err < 0) {
if (0 == retval)
retval = err;
*fc = q->read_buf->field_count >> 1;
dprintk(1,"vbihack: %d\n",*fc);
}
-
+
/* copy stuff */
bytes = count;
if (bytes > q->read_buf->size - q->read_off)
list_add_tail(&q->read_buf->stream,
&q->stream);
spin_lock_irqsave(q->irqlock,flags);
- q->ops->buf_queue(file,q->read_buf);
+ q->ops->buf_queue(q,q->read_buf);
spin_unlock_irqrestore(q->irqlock,flags);
q->read_buf = NULL;
}
struct videobuf_buffer, stream);
} else {
if (!q->reading)
- videobuf_read_start(file,q);
+ videobuf_read_start(q);
if (!q->reading) {
rc = POLLERR;
} else if (NULL == q->read_buf) {
videobuf_vm_close(struct vm_area_struct *vma)
{
struct videobuf_mapping *map = vma->vm_private_data;
+ struct videobuf_queue *q = map->q;
int i;
dprintk(2,"vm_close %p [count=%d,vma=%08lx-%08lx]\n",map,
map->count,vma->vm_start,vma->vm_end);
- /* down(&fh->lock); FIXME */
map->count--;
if (0 == map->count) {
- dprintk(1,"munmap %p\n",map);
+ dprintk(1,"munmap %p q=%p\n",map,q);
+ down(&q->lock);
for (i = 0; i < VIDEO_MAX_FRAME; i++) {
- if (NULL == map->q->bufs[i])
+ if (NULL == q->bufs[i])
continue;
- if (map->q->bufs[i])
+ if (q->bufs[i])
;
- if (map->q->bufs[i]->map != map)
+ if (q->bufs[i]->map != map)
continue;
- map->q->bufs[i]->map = NULL;
- map->q->bufs[i]->baddr = 0;
- map->q->ops->buf_release(vma->vm_file,map->q->bufs[i]);
+ q->bufs[i]->map = NULL;
+ q->bufs[i]->baddr = 0;
+ q->ops->buf_release(q,q->bufs[i]);
}
+ up(&q->lock);
kfree(map);
}
- /* up(&fh->lock); FIXME */
return;
}
.nopage = videobuf_vm_nopage,
};
-int videobuf_mmap_setup(struct file *file, struct videobuf_queue *q,
+int videobuf_mmap_setup(struct videobuf_queue *q,
unsigned int bcount, unsigned int bsize,
enum v4l2_memory memory)
{
unsigned int i;
int err;
- err = videobuf_mmap_free(file,q);
+ err = videobuf_mmap_free(q);
if (0 != err)
return err;
for (i = 0; i < bcount; i++) {
q->bufs[i] = videobuf_alloc(q->msize);
q->bufs[i]->i = i;
+ q->bufs[i]->input = UNSET;
q->bufs[i]->memory = memory;
q->bufs[i]->bsize = bsize;
switch (memory) {
case V4L2_MEMORY_OVERLAY:
/* nothing */
break;
- };
+ }
}
dprintk(1,"mmap setup: %d buffers, %d bytes each\n",
bcount,bsize);
return 0;
}
-int videobuf_mmap_free(struct file *file, struct videobuf_queue *q)
+int videobuf_mmap_free(struct videobuf_queue *q)
{
int i;
for (i = 0; i < VIDEO_MAX_FRAME; i++) {
if (NULL == q->bufs[i])
continue;
- q->ops->buf_release(file,q->bufs[i]);
+ q->ops->buf_release(q,q->bufs[i]);
kfree(q->bufs[i]);
q->bufs[i] = NULL;
}
return 0;
}
-int videobuf_mmap_mapper(struct vm_area_struct *vma,
- struct videobuf_queue *q)
+int videobuf_mmap_mapper(struct videobuf_queue *q,
+ struct vm_area_struct *vma)
{
struct videobuf_mapping *map;
unsigned int first,last,size,i;
vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED;
vma->vm_flags &= ~VM_IO; /* using shared anonymous pages */
vma->vm_private_data = map;
- dprintk(1,"mmap %p: %08lx-%08lx pgoff %08lx bufs %d-%d\n",
- map,vma->vm_start,vma->vm_end,vma->vm_pgoff,first,last);
+ dprintk(1,"mmap %p: q=%p %08lx-%08lx pgoff %08lx bufs %d-%d\n",
+ map,q,vma->vm_start,vma->vm_end,vma->vm_pgoff,first,last);
retval = 0;
done:
EXPORT_SYMBOL_GPL(videobuf_vmalloc_to_sg);
+EXPORT_SYMBOL_GPL(videobuf_dma_init);
EXPORT_SYMBOL_GPL(videobuf_dma_init_user);
EXPORT_SYMBOL_GPL(videobuf_dma_init_kernel);
EXPORT_SYMBOL_GPL(videobuf_dma_init_overlay);
git://git.onelab.eu / linux-2.6.git / blobdiff