Skip to content

L
linux
Commit b7649ef7 authored by Gerd Knorr's avatar Gerd Knorr Committed by Linus Torvalds
Browse files
Options

[PATCH] videobuf update 

This updates the video-buf.c module (helper module for video buffer
management).  Some memory management fixes, also some adaptions to the
final v4l2 api.
parent 2f61876e
Hide whitespace changes
Inline Side-by-side
Showing with 110 additions and 78 deletions
drivers/media/video/video-buf.c
View file @ b7649ef7
......@@ -26,6 +26,11 @@
#include <asm/page.h>
#include <asm/pgtable.h>
#ifndef TryLockPage
# include "linux/page-flags.h"
# define TryLockPage TestSetPageLocked
#endif
#include "video-buf.h"
static int debug = 0;
......@@ -65,12 +70,12 @@ videobuf_vmalloc_to_sg(unsigned char *virt, int nr_pages)
return NULL;
}
struct scatterlist *
struct scatterlist*
videobuf_pages_to_sg(struct page **pages, int nr_pages, int offset)
{
struct scatterlist *sglist;
int i = 0;
if (NULL == pages[0])
return NULL;
sglist = kmalloc(sizeof(*sglist) * nr_pages, GFP_KERNEL);
......@@ -80,21 +85,27 @@ videobuf_pages_to_sg(struct page **pages, int nr_pages, int offset)
if (PageHighMem(pages[0]))
/* DMA to highmem pages might not work */
goto err;
goto highmem;
sglist[0].page = pages[0];
sglist[0].offset = offset;
sglist[0].length = PAGE_SIZE - offset;
for (i = 1; i < nr_pages; i++) {
if (NULL == pages[i])
goto err;
goto nopage;
if (PageHighMem(pages[i]))
goto err;
goto highmem;
sglist[i].page = pages[i];
sglist[i].length = PAGE_SIZE;
}
return sglist;
err:
nopage:
dprintk(2,"sgl: oops - no page\n");
kfree(sglist);
return NULL;
highmem:
dprintk(2,"sgl: oops - highmem page\n");
kfree(sglist);
return NULL;
}
......@@ -103,14 +114,18 @@ int videobuf_lock(struct page **pages, int nr_pages)
{
int i;
dprintk(2,"lock start ...\n");
for (i = 0; i < nr_pages; i++)
if (TestSetPageLocked(pages[i]))
if (TryLockPage(pages[i]))
goto err;
dprintk(2,"lock ok\n");
return 0;
err:
dprintk(2,"lock failed, unlock ...\n");
while (i > 0)
unlock_page(pages[--i]);
dprintk(2,"lock quit\n");
return -EINVAL;
}
......@@ -118,8 +133,10 @@ int videobuf_unlock(struct page **pages, int nr_pages)
{
int i;
dprintk(2,"unlock start ...\n");
for (i = 0; i < nr_pages; i++)
unlock_page(pages[i]);
dprintk(2,"unlock ok\n");
return 0;
}
......@@ -128,6 +145,7 @@ int videobuf_unlock(struct page **pages, int nr_pages)
int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction,
unsigned long data, unsigned long size)
{
unsigned long first,last;
int err, rw = 0;
dma->direction = direction;
......@@ -137,25 +155,35 @@ int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction,
default: BUG();
}
dma->offset = data & PAGE_MASK;
dma->nr_pages = ((((data+size) & ~PAGE_MASK) -
(data & ~PAGE_MASK)) >> PAGE_SHIFT) +1;
dma->pages = kmalloc(dma->nr_pages * sizeof(struct page*),
GFP_KERNEL);
first = (data & PAGE_MASK) >> PAGE_SHIFT;
last = ((data+size-1) & PAGE_MASK) >> PAGE_SHIFT;
dma->offset = data & ~PAGE_MASK;
dma->nr_pages = last-first+1;
dma->pages = kmalloc(dma->nr_pages * sizeof(struct page*),
GFP_KERNEL);
if (NULL == dma->pages)
return -ENOMEM;
dprintk(1,"init user [0x%lx+0x%lx => %d pages]\n",
data,size,dma->nr_pages);
down_read(&current->mm->mmap_sem);
err = get_user_pages(current,current->mm,
data, dma->nr_pages,
rw == READ, 0, /* don't force */
data & PAGE_MASK, dma->nr_pages,
rw == READ, 1, /* force */
dma->pages, NULL);
up_read(&current->mm->mmap_sem);
return err;
if (err != dma->nr_pages) {
dma->nr_pages = (err >= 0) ? err : 0;
dprintk(1,"get_user_pages: err=%d [%d]\n",err,dma->nr_pages);
return err < 0 ? err : -EINVAL;
}
return 0;
}
int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction,
int nr_pages)
{
dprintk(1,"init kernel [%d pages]\n",nr_pages);
dma->direction = direction;
dma->vmalloc = vmalloc_32(nr_pages << PAGE_SHIFT);
if (NULL == dma->vmalloc) {
......@@ -176,13 +204,14 @@ int videobuf_dma_pci_map(struct pci_dev *dev, struct videobuf_dmabuf *dma)
if (dma->pages) {
if (0 != (err = videobuf_lock(dma->pages, dma->nr_pages))) {
dprintk(1,"videobuf_lock_pages: %d\n",err);
dprintk(1,"videobuf_lock: %d\n",err);
return err;
}
dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages,
dma->offset);
if (NULL == dma->sglist)
videobuf_unlock(dma->pages, dma->nr_pages);
}
if (dma->vmalloc) {
dma->sglist = videobuf_vmalloc_to_sg
(dma->vmalloc,dma->nr_pages);
......@@ -215,7 +244,7 @@ int videobuf_dma_pci_unmap(struct pci_dev *dev, struct videobuf_dmabuf *dma)
dma->sglist = NULL;
dma->sglen = 0;
if (dma->pages)
videobuf_lock(dma->pages, dma->nr_pages);
videobuf_unlock(dma->pages, dma->nr_pages);
return 0;
}
......@@ -231,7 +260,6 @@ int videobuf_dma_free(struct videobuf_dmabuf *dma)
kfree(dma->pages);
dma->pages = NULL;
}
if (dma->vmalloc) {
vfree(dma->vmalloc);
dma->vmalloc = NULL;
......@@ -286,16 +314,12 @@ videobuf_iolock(struct pci_dev *pci, struct videobuf_buffer *vb)
if (0 == vb->baddr) {
/* no userspace addr -- kernel bounce buffer */
pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
dprintk(1,"kernel buf size=%ld (%d pages)\n",
vb->size,pages);
err = videobuf_dma_init_kernel(&vb->dma,PCI_DMA_FROMDEVICE,
pages);
if (0 != err)
return err;
} else {
/* dma directly to userspace */
dprintk(1,"user buf addr=%08lx size=%ld\n",
vb->baddr,vb->bsize);
err = videobuf_dma_init_user(&vb->dma,PCI_DMA_FROMDEVICE,
vb->baddr,vb->bsize);
if (0 != err)
......@@ -314,7 +338,7 @@ videobuf_queue_init(struct videobuf_queue *q,
struct videobuf_queue_ops *ops,
struct pci_dev *pci,
spinlock_t *irqlock,
int type,
enum v4l2_buf_type type,
int msize)
{
memset(q,0,sizeof(*q));
......@@ -329,6 +353,30 @@ videobuf_queue_init(struct videobuf_queue *q,
INIT_LIST_HEAD(&q->stream);
}
int
videobuf_queue_is_busy(struct videobuf_queue *q)
{
int i;
if (q->reading)
return 1;
if (q->streaming)
return 1;
if (q->read_buf)
return 1;
for (i = 0; i < VIDEO_MAX_FRAME; i++) {
if (NULL == q->bufs[i])
continue;
if (q->bufs[i]->map)
return 1;
if (q->bufs[i]->state == STATE_QUEUED)
return 1;
if (q->bufs[i]->state == STATE_ACTIVE)
return 1;
}
return 0;
}
void
videobuf_queue_cancel(struct file *file, struct videobuf_queue *q)
{
......@@ -358,15 +406,15 @@ videobuf_queue_cancel(struct file *file, struct videobuf_queue *q)
/* --------------------------------------------------------------------- */
#ifdef HAVE_V4L2
void
videobuf_status(struct v4l2_buffer *b, struct videobuf_buffer *vb, int type)
videobuf_status(struct v4l2_buffer *b, struct videobuf_buffer *vb,
enum v4l2_buf_type type)
{
b->index = vb->i;
b->type = type;
b->offset = vb->boff;
b->length = vb->bsize;
b->flags = 0;
b->index = vb->i;
b->type = type;
b->m.offset = vb->boff;
b->length = vb->bsize;
b->flags = 0;
if (vb->map)
b->flags |= V4L2_BUF_FLAG_MAPPED;
switch (vb->state) {
......@@ -384,12 +432,7 @@ videobuf_status(struct v4l2_buffer *b, struct videobuf_buffer *vb, int type)
/* nothing */
break;
}
if (!(vb->field & VBUF_FIELD_INTER)) {
if (vb->field & VBUF_FIELD_ODD)
b->flags |= V4L2_BUF_FLAG_TOPFIELD;
if (vb->field & VBUF_FIELD_EVEN)
b->flags |= V4L2_BUF_FLAG_BOTFIELD;
}
b->field = vb->field;
b->timestamp = vb->ts;
b->bytesused = vb->size;
b->sequence = vb->field_count >> 1;
......@@ -401,7 +444,7 @@ videobuf_reqbufs(struct file *file, struct videobuf_queue *q,
{
int size,count,retval;
if ((req->type & V4L2_BUF_TYPE_field) != q->type)
if (req->type != q->type)
return -EINVAL;
if (req->count < 1)
return -EINVAL;
......@@ -428,11 +471,11 @@ videobuf_reqbufs(struct file *file, struct videobuf_queue *q,
int
videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b)
{
if ((b->type & V4L2_BUF_TYPE_field) != q->type)
if (unlikely(b->type != q->type))
return -EINVAL;
if (b->index < 0 || b->index >= VIDEO_MAX_FRAME)
if (unlikely(b->index < 0 || b->index >= VIDEO_MAX_FRAME))
return -EINVAL;
if (NULL == q->bufs[b->index])
if (unlikely(NULL == q->bufs[b->index]))
return -EINVAL;
videobuf_status(b,q->bufs[b->index],q->type);
return 0;
......@@ -444,7 +487,6 @@ videobuf_qbuf(struct file *file, struct videobuf_queue *q,
{
struct videobuf_buffer *buf;
unsigned long flags;
int field = 0;
int retval;
down(&q->lock);
......@@ -452,7 +494,7 @@ videobuf_qbuf(struct file *file, struct videobuf_queue *q,
if (q->reading)
goto done;
retval = -EINVAL;
if ((b->type & V4L2_BUF_TYPE_field) != q->type)
if (b->type != q->type)
goto done;
if (b->index < 0 || b->index >= VIDEO_MAX_FRAME)
goto done;
......@@ -465,11 +507,7 @@ videobuf_qbuf(struct file *file, struct videobuf_queue *q,
buf->state == STATE_ACTIVE)
goto done;
if (b->flags & V4L2_BUF_FLAG_TOPFIELD)
field |= VBUF_FIELD_ODD;
if (b->flags & V4L2_BUF_FLAG_BOTFIELD)
field |= VBUF_FIELD_EVEN;
retval = q->ops->buf_prepare(file,buf,field);
retval = q->ops->buf_prepare(file,buf);
if (0 != retval)
goto done;
......@@ -498,7 +536,7 @@ videobuf_dqbuf(struct file *file, struct videobuf_queue *q,
if (q->reading)
goto done;
retval = -EINVAL;
if ((b->type & V4L2_BUF_TYPE_field) != q->type)
if (b->type != q->type)
goto done;
if (list_empty(&q->stream))
goto done;
......@@ -526,7 +564,6 @@ videobuf_dqbuf(struct file *file, struct videobuf_queue *q,
up(&q->lock);
return retval;
}
#endif /* HAVE_V4L2 */
int videobuf_streamon(struct file *file, struct videobuf_queue *q)
{
......@@ -586,7 +623,7 @@ videobuf_read_zerocopy(struct file *file, struct videobuf_queue *q,
q->read_buf->baddr = (unsigned long)data;
q->read_buf->bsize = count;
retval = q->ops->buf_prepare(file,q->read_buf,0);
retval = q->ops->buf_prepare(file,q->read_buf);
if (0 != retval)
goto done;
......@@ -631,7 +668,7 @@ ssize_t videobuf_read_one(struct file *file, struct videobuf_queue *q,
q->read_buf = videobuf_alloc(q->msize);
if (NULL == q->read_buf)
goto done;
retval = q->ops->buf_prepare(file,q->read_buf,0);
retval = q->ops->buf_prepare(file,q->read_buf);
if (0 != retval)
goto done;
q->ops->buf_queue(file,q->read_buf);
......@@ -683,7 +720,7 @@ int videobuf_read_start(struct file *file, struct videobuf_queue *q)
if (err)
return err;
for (i = 0; i < count; i++) {
err = q->ops->buf_prepare(file,q->bufs[i],0);
err = q->ops->buf_prepare(file,q->bufs[i]);
if (err)
return err;
list_add_tail(&q->bufs[i]->stream, &q->stream);
......@@ -1008,6 +1045,8 @@ int videobuf_mmap_mapper(struct vm_area_struct *vma,
/* --------------------------------------------------------------------- */
EXPORT_SYMBOL_GPL(videobuf_vmalloc_to_sg);
EXPORT_SYMBOL_GPL(videobuf_lock);
EXPORT_SYMBOL_GPL(videobuf_unlock);
EXPORT_SYMBOL_GPL(videobuf_dma_init_user);
EXPORT_SYMBOL_GPL(videobuf_dma_init_kernel);
......@@ -1022,14 +1061,13 @@ EXPORT_SYMBOL_GPL(videobuf_iolock);
EXPORT_SYMBOL_GPL(videobuf_queue_init);
EXPORT_SYMBOL_GPL(videobuf_queue_cancel);
EXPORT_SYMBOL_GPL(videobuf_queue_is_busy);
#ifdef HAVE_V4L2
EXPORT_SYMBOL_GPL(videobuf_status);
EXPORT_SYMBOL_GPL(videobuf_reqbufs);
EXPORT_SYMBOL_GPL(videobuf_querybuf);
EXPORT_SYMBOL_GPL(videobuf_qbuf);
EXPORT_SYMBOL_GPL(videobuf_dqbuf);
#endif
EXPORT_SYMBOL_GPL(videobuf_streamon);
EXPORT_SYMBOL_GPL(videobuf_streamoff);
......
drivers/media/video/video-buf.h
View file @ b7649ef7
......@@ -28,12 +28,14 @@
struct scatterlist* videobuf_vmalloc_to_sg(unsigned char *virt, int nr_pages);
/*
* Return a scatterlist for a an array of userpages (NULL on errors). Memory
* for the scatterlist is allocated using kmalloc. The caller must
* free the memory.
* Return a scatterlist for a an array of userpages (NULL on errors).
* Memory for the scatterlist is allocated using kmalloc. The caller
* must free the memory.
*/
struct scatterlist *videobuf_pages_to_sg(struct page **pages, int nr_pages,
struct scatterlist* videobuf_pages_to_sg(struct page **pages, int nr_pages,
int offset);
int videobuf_lock(struct page **pages, int nr_pages);
int videobuf_unlock(struct page **pages, int nr_pages);
/* --------------------------------------------------------------------- */
......@@ -58,8 +60,8 @@ struct scatterlist *videobuf_pages_to_sg(struct page **pages, int nr_pages,
struct videobuf_dmabuf {
/* for userland buffer */
struct page **pages;
int offset;
struct page **pages;
/* for kernel buffers */
void *vmalloc;
......@@ -115,10 +117,6 @@ struct videobuf_mapping {
struct videobuf_queue *q;
};
#define VBUF_FIELD_EVEN 1
#define VBUF_FIELD_ODD 2
#define VBUF_FIELD_INTER 4
enum videobuf_state {
STATE_NEEDS_INIT = 0,
STATE_PREPARED = 1,
......@@ -136,30 +134,27 @@ struct videobuf_buffer {
int width;
int height;
long size;
int field;
enum v4l2_field field;
enum videobuf_state state;
struct videobuf_dmabuf dma;
struct list_head stream; /* QBUF/DQBUF list */
/* for mmap'ed buffers */
unsigned long boff; /* buffer offset (mmap) */
unsigned long bsize; /* buffer size */
unsigned long baddr; /* buffer addr (userland ptr!) */
off_t boff; /* buffer offset (mmap) */
size_t bsize; /* buffer size */
unsigned long baddr; /* buffer addr (userland ptr!) */
struct videobuf_mapping *map;
/* touched by irq handler */
struct list_head queue;
wait_queue_head_t done;
int field_count;
#ifdef HAVE_V4L2
stamp_t ts;
#endif
struct timeval ts;
};
struct videobuf_queue_ops {
int (*buf_setup)(struct file *file, int *count, int *size);
int (*buf_prepare)(struct file *file,struct videobuf_buffer *vb,
int field);
int (*buf_prepare)(struct file *file,struct videobuf_buffer *vb);
void (*buf_queue)(struct file *file,struct videobuf_buffer *vb);
void (*buf_release)(struct file *file,struct videobuf_buffer *vb);
};
......@@ -169,7 +164,7 @@ struct videobuf_queue {
spinlock_t *irqlock;
struct pci_dev *pci;
int type;
enum v4l2_buf_type type;
int msize;
struct videobuf_buffer *bufs[VIDEO_MAX_FRAME];
struct videobuf_queue_ops *ops;
......@@ -191,12 +186,12 @@ int videobuf_iolock(struct pci_dev *pci, struct videobuf_buffer *vb);
void videobuf_queue_init(struct videobuf_queue *q,
struct videobuf_queue_ops *ops,
struct pci_dev *pci, spinlock_t *irqlock,
int type, int msize);
enum v4l2_buf_type type, int msize);
int videobuf_queue_is_busy(struct videobuf_queue *q);
void videobuf_queue_cancel(struct file *file, struct videobuf_queue *q);
#ifdef HAVE_V4L2
void videobuf_status(struct v4l2_buffer *b, struct videobuf_buffer *vb,
int type);
enum v4l2_buf_type type);
int videobuf_reqbufs(struct file *file, struct videobuf_queue *q,
struct v4l2_requestbuffers *req);
int videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b);
......@@ -204,7 +199,6 @@ int videobuf_qbuf(struct file *file, struct videobuf_queue *q,
struct v4l2_buffer *b);
int videobuf_dqbuf(struct file *file, struct videobuf_queue *q,
struct v4l2_buffer *b);
#endif
int videobuf_streamon(struct file *file, struct videobuf_queue *q);
int videobuf_streamoff(struct file *file, struct videobuf_queue *q);
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment
GitLab Nexedi Edition | About GitLab | About Nexedi | 沪ICP备2021021310号-2 | 沪ICP备2021021310号-7