![Hans Verkuil](/assets/img/avatar_default.png)
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
633 lines
15 KiB
C
633 lines
15 KiB
C
/*
|
|
* helper functions for SG DMA video4linux capture buffers
|
|
*
|
|
* The functions expect the hardware being able to scatter gather
|
|
* (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.
|
|
*
|
|
* (c) 2007 Mauro Carvalho Chehab, <mchehab@infradead.org>
|
|
*
|
|
* Highly based on video-buf written originally by:
|
|
* (c) 2001,02 Gerd Knorr <kraxel@bytesex.org>
|
|
* (c) 2006 Mauro Carvalho Chehab, <mchehab@infradead.org>
|
|
* (c) 2006 Ted Walther and John Sokol
|
|
*
|
|
* 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
|
|
* the Free Software Foundation; either version 2
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/interrupt.h>
|
|
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/scatterlist.h>
|
|
#include <asm/page.h>
|
|
#include <asm/pgtable.h>
|
|
|
|
#include <media/videobuf-dma-sg.h>
|
|
|
|
#define MAGIC_DMABUF 0x19721112
|
|
#define MAGIC_SG_MEM 0x17890714
|
|
|
|
#define MAGIC_CHECK(is, should) \
|
|
if (unlikely((is) != (should))) { \
|
|
printk(KERN_ERR "magic mismatch: %x (expected %x)\n", \
|
|
is, should); \
|
|
BUG(); \
|
|
}
|
|
|
|
static int debug;
|
|
module_param(debug, int, 0644);
|
|
|
|
MODULE_DESCRIPTION("helper module to manage video4linux dma sg buffers");
|
|
MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
#define dprintk(level, fmt, arg...) \
|
|
if (debug >= level) \
|
|
printk(KERN_DEBUG "vbuf-sg: " fmt , ## arg)
|
|
|
|
/* --------------------------------------------------------------------- */
|
|
|
|
/*
|
|
* Return a scatterlist for some page-aligned vmalloc()'ed memory
|
|
* block (NULL on errors). Memory for the scatterlist is allocated
|
|
* using kmalloc. The caller must free the memory.
|
|
*/
|
|
static struct scatterlist *videobuf_vmalloc_to_sg(unsigned char *virt,
|
|
int nr_pages)
|
|
{
|
|
struct scatterlist *sglist;
|
|
struct page *pg;
|
|
int i;
|
|
|
|
sglist = vzalloc(nr_pages * sizeof(*sglist));
|
|
if (NULL == sglist)
|
|
return NULL;
|
|
sg_init_table(sglist, nr_pages);
|
|
for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) {
|
|
pg = vmalloc_to_page(virt);
|
|
if (NULL == pg)
|
|
goto err;
|
|
BUG_ON(PageHighMem(pg));
|
|
sg_set_page(&sglist[i], pg, PAGE_SIZE, 0);
|
|
}
|
|
return sglist;
|
|
|
|
err:
|
|
vfree(sglist);
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
static struct scatterlist *videobuf_pages_to_sg(struct page **pages,
|
|
int nr_pages, int offset, size_t size)
|
|
{
|
|
struct scatterlist *sglist;
|
|
int i;
|
|
|
|
if (NULL == pages[0])
|
|
return NULL;
|
|
sglist = vmalloc(nr_pages * sizeof(*sglist));
|
|
if (NULL == sglist)
|
|
return NULL;
|
|
sg_init_table(sglist, nr_pages);
|
|
|
|
if (PageHighMem(pages[0]))
|
|
/* DMA to highmem pages might not work */
|
|
goto highmem;
|
|
sg_set_page(&sglist[0], pages[0], PAGE_SIZE - offset, offset);
|
|
size -= PAGE_SIZE - offset;
|
|
for (i = 1; i < nr_pages; i++) {
|
|
if (NULL == pages[i])
|
|
goto nopage;
|
|
if (PageHighMem(pages[i]))
|
|
goto highmem;
|
|
sg_set_page(&sglist[i], pages[i], min_t(size_t, PAGE_SIZE, size), 0);
|
|
size -= min_t(size_t, PAGE_SIZE, size);
|
|
}
|
|
return sglist;
|
|
|
|
nopage:
|
|
dprintk(2, "sgl: oops - no page\n");
|
|
vfree(sglist);
|
|
return NULL;
|
|
|
|
highmem:
|
|
dprintk(2, "sgl: oops - highmem page\n");
|
|
vfree(sglist);
|
|
return NULL;
|
|
}
|
|
|
|
/* --------------------------------------------------------------------- */
|
|
|
|
struct videobuf_dmabuf *videobuf_to_dma(struct videobuf_buffer *buf)
|
|
{
|
|
struct videobuf_dma_sg_memory *mem = buf->priv;
|
|
BUG_ON(!mem);
|
|
|
|
MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
|
|
|
|
return &mem->dma;
|
|
}
|
|
EXPORT_SYMBOL_GPL(videobuf_to_dma);
|
|
|
|
void videobuf_dma_init(struct videobuf_dmabuf *dma)
|
|
{
|
|
memset(dma, 0, sizeof(*dma));
|
|
dma->magic = MAGIC_DMABUF;
|
|
}
|
|
EXPORT_SYMBOL_GPL(videobuf_dma_init);
|
|
|
|
static int videobuf_dma_init_user_locked(struct videobuf_dmabuf *dma,
|
|
int direction, unsigned long data, unsigned long size)
|
|
{
|
|
unsigned long first, last;
|
|
int err, rw = 0;
|
|
|
|
dma->direction = direction;
|
|
switch (dma->direction) {
|
|
case DMA_FROM_DEVICE:
|
|
rw = READ;
|
|
break;
|
|
case DMA_TO_DEVICE:
|
|
rw = WRITE;
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
|
|
first = (data & PAGE_MASK) >> PAGE_SHIFT;
|
|
last = ((data+size-1) & PAGE_MASK) >> PAGE_SHIFT;
|
|
dma->offset = data & ~PAGE_MASK;
|
|
dma->size = size;
|
|
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);
|
|
|
|
err = get_user_pages(current, current->mm,
|
|
data & PAGE_MASK, dma->nr_pages,
|
|
rw == READ, 1, /* force */
|
|
dma->pages, NULL);
|
|
|
|
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_user(struct videobuf_dmabuf *dma, int direction,
|
|
unsigned long data, unsigned long size)
|
|
{
|
|
int ret;
|
|
|
|
down_read(¤t->mm->mmap_sem);
|
|
ret = videobuf_dma_init_user_locked(dma, direction, data, size);
|
|
up_read(¤t->mm->mmap_sem);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(videobuf_dma_init_user);
|
|
|
|
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->vaddr = vmalloc_32(nr_pages << PAGE_SHIFT);
|
|
if (NULL == dma->vaddr) {
|
|
dprintk(1, "vmalloc_32(%d pages) failed\n", nr_pages);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
dprintk(1, "vmalloc is at addr 0x%08lx, size=%d\n",
|
|
(unsigned long)dma->vaddr,
|
|
nr_pages << PAGE_SHIFT);
|
|
|
|
memset(dma->vaddr, 0, nr_pages << PAGE_SHIFT);
|
|
dma->nr_pages = nr_pages;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(videobuf_dma_init_kernel);
|
|
|
|
int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction,
|
|
dma_addr_t addr, int nr_pages)
|
|
{
|
|
dprintk(1, "init overlay [%d pages @ bus 0x%lx]\n",
|
|
nr_pages, (unsigned long)addr);
|
|
dma->direction = direction;
|
|
|
|
if (0 == addr)
|
|
return -EINVAL;
|
|
|
|
dma->bus_addr = addr;
|
|
dma->nr_pages = nr_pages;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(videobuf_dma_init_overlay);
|
|
|
|
int videobuf_dma_map(struct device *dev, struct videobuf_dmabuf *dma)
|
|
{
|
|
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, dma->size);
|
|
}
|
|
if (dma->vaddr) {
|
|
dma->sglist = videobuf_vmalloc_to_sg(dma->vaddr,
|
|
dma->nr_pages);
|
|
}
|
|
if (dma->bus_addr) {
|
|
dma->sglist = vmalloc(sizeof(*dma->sglist));
|
|
if (NULL != dma->sglist) {
|
|
dma->sglen = 1;
|
|
sg_dma_address(&dma->sglist[0]) = dma->bus_addr
|
|
& PAGE_MASK;
|
|
dma->sglist[0].offset = dma->bus_addr & ~PAGE_MASK;
|
|
sg_dma_len(&dma->sglist[0]) = dma->nr_pages * PAGE_SIZE;
|
|
}
|
|
}
|
|
if (NULL == dma->sglist) {
|
|
dprintk(1, "scatterlist is NULL\n");
|
|
return -ENOMEM;
|
|
}
|
|
if (!dma->bus_addr) {
|
|
dma->sglen = dma_map_sg(dev, dma->sglist,
|
|
dma->nr_pages, dma->direction);
|
|
if (0 == dma->sglen) {
|
|
printk(KERN_WARNING
|
|
"%s: videobuf_map_sg failed\n", __func__);
|
|
vfree(dma->sglist);
|
|
dma->sglist = NULL;
|
|
dma->sglen = 0;
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(videobuf_dma_map);
|
|
|
|
int videobuf_dma_unmap(struct device *dev, struct videobuf_dmabuf *dma)
|
|
{
|
|
MAGIC_CHECK(dma->magic, MAGIC_DMABUF);
|
|
|
|
if (!dma->sglen)
|
|
return 0;
|
|
|
|
dma_unmap_sg(dev, dma->sglist, dma->sglen, dma->direction);
|
|
|
|
vfree(dma->sglist);
|
|
dma->sglist = NULL;
|
|
dma->sglen = 0;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(videobuf_dma_unmap);
|
|
|
|
int videobuf_dma_free(struct videobuf_dmabuf *dma)
|
|
{
|
|
int i;
|
|
MAGIC_CHECK(dma->magic, MAGIC_DMABUF);
|
|
BUG_ON(dma->sglen);
|
|
|
|
if (dma->pages) {
|
|
for (i = 0; i < dma->nr_pages; i++)
|
|
page_cache_release(dma->pages[i]);
|
|
kfree(dma->pages);
|
|
dma->pages = NULL;
|
|
}
|
|
|
|
vfree(dma->vaddr);
|
|
dma->vaddr = NULL;
|
|
|
|
if (dma->bus_addr)
|
|
dma->bus_addr = 0;
|
|
dma->direction = DMA_NONE;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(videobuf_dma_free);
|
|
|
|
/* --------------------------------------------------------------------- */
|
|
|
|
static void videobuf_vm_open(struct vm_area_struct *vma)
|
|
{
|
|
struct videobuf_mapping *map = vma->vm_private_data;
|
|
|
|
dprintk(2, "vm_open %p [count=%d,vma=%08lx-%08lx]\n", map,
|
|
map->count, vma->vm_start, vma->vm_end);
|
|
|
|
map->count++;
|
|
}
|
|
|
|
static void videobuf_vm_close(struct vm_area_struct *vma)
|
|
{
|
|
struct videobuf_mapping *map = vma->vm_private_data;
|
|
struct videobuf_queue *q = map->q;
|
|
struct videobuf_dma_sg_memory *mem;
|
|
int i;
|
|
|
|
dprintk(2, "vm_close %p [count=%d,vma=%08lx-%08lx]\n", map,
|
|
map->count, vma->vm_start, vma->vm_end);
|
|
|
|
map->count--;
|
|
if (0 == map->count) {
|
|
dprintk(1, "munmap %p q=%p\n", map, q);
|
|
videobuf_queue_lock(q);
|
|
for (i = 0; i < VIDEO_MAX_FRAME; i++) {
|
|
if (NULL == q->bufs[i])
|
|
continue;
|
|
mem = q->bufs[i]->priv;
|
|
if (!mem)
|
|
continue;
|
|
|
|
MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
|
|
|
|
if (q->bufs[i]->map != map)
|
|
continue;
|
|
q->bufs[i]->map = NULL;
|
|
q->bufs[i]->baddr = 0;
|
|
q->ops->buf_release(q, q->bufs[i]);
|
|
}
|
|
videobuf_queue_unlock(q);
|
|
kfree(map);
|
|
}
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Get a anonymous page for the mapping. Make sure we can DMA to that
|
|
* memory location with 32bit PCI devices (i.e. don't use highmem for
|
|
* now ...). Bounce buffers don't work very well for the data rates
|
|
* video capture has.
|
|
*/
|
|
static int videobuf_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
|
|
{
|
|
struct page *page;
|
|
|
|
dprintk(3, "fault: fault @ %08lx [vma %08lx-%08lx]\n",
|
|
(unsigned long)vmf->virtual_address,
|
|
vma->vm_start, vma->vm_end);
|
|
|
|
page = alloc_page(GFP_USER | __GFP_DMA32);
|
|
if (!page)
|
|
return VM_FAULT_OOM;
|
|
clear_user_highpage(page, (unsigned long)vmf->virtual_address);
|
|
vmf->page = page;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct vm_operations_struct videobuf_vm_ops = {
|
|
.open = videobuf_vm_open,
|
|
.close = videobuf_vm_close,
|
|
.fault = videobuf_vm_fault,
|
|
};
|
|
|
|
/* ---------------------------------------------------------------------
|
|
* SG handlers for the generic methods
|
|
*/
|
|
|
|
/* Allocated area consists on 3 parts:
|
|
struct video_buffer
|
|
struct <driver>_buffer (cx88_buffer, saa7134_buf, ...)
|
|
struct videobuf_dma_sg_memory
|
|
*/
|
|
|
|
static struct videobuf_buffer *__videobuf_alloc_vb(size_t size)
|
|
{
|
|
struct videobuf_dma_sg_memory *mem;
|
|
struct videobuf_buffer *vb;
|
|
|
|
vb = kzalloc(size + sizeof(*mem), GFP_KERNEL);
|
|
if (!vb)
|
|
return vb;
|
|
|
|
mem = vb->priv = ((char *)vb) + size;
|
|
mem->magic = MAGIC_SG_MEM;
|
|
|
|
videobuf_dma_init(&mem->dma);
|
|
|
|
dprintk(1, "%s: allocated at %p(%ld+%ld) & %p(%ld)\n",
|
|
__func__, vb, (long)sizeof(*vb), (long)size - sizeof(*vb),
|
|
mem, (long)sizeof(*mem));
|
|
|
|
return vb;
|
|
}
|
|
|
|
static void *__videobuf_to_vaddr(struct videobuf_buffer *buf)
|
|
{
|
|
struct videobuf_dma_sg_memory *mem = buf->priv;
|
|
BUG_ON(!mem);
|
|
|
|
MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
|
|
|
|
return mem->dma.vaddr;
|
|
}
|
|
|
|
static int __videobuf_iolock(struct videobuf_queue *q,
|
|
struct videobuf_buffer *vb,
|
|
struct v4l2_framebuffer *fbuf)
|
|
{
|
|
int err, pages;
|
|
dma_addr_t bus;
|
|
struct videobuf_dma_sg_memory *mem = vb->priv;
|
|
BUG_ON(!mem);
|
|
|
|
MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
|
|
|
|
switch (vb->memory) {
|
|
case V4L2_MEMORY_MMAP:
|
|
case V4L2_MEMORY_USERPTR:
|
|
if (0 == vb->baddr) {
|
|
/* no userspace addr -- kernel bounce buffer */
|
|
pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
|
|
err = videobuf_dma_init_kernel(&mem->dma,
|
|
DMA_FROM_DEVICE,
|
|
pages);
|
|
if (0 != err)
|
|
return err;
|
|
} else if (vb->memory == V4L2_MEMORY_USERPTR) {
|
|
/* dma directly to userspace */
|
|
err = videobuf_dma_init_user(&mem->dma,
|
|
DMA_FROM_DEVICE,
|
|
vb->baddr, vb->bsize);
|
|
if (0 != err)
|
|
return err;
|
|
} else {
|
|
/* NOTE: HACK: videobuf_iolock on V4L2_MEMORY_MMAP
|
|
buffers can only be called from videobuf_qbuf
|
|
we take current->mm->mmap_sem there, to prevent
|
|
locking inversion, so don't take it here */
|
|
|
|
err = videobuf_dma_init_user_locked(&mem->dma,
|
|
DMA_FROM_DEVICE,
|
|
vb->baddr, vb->bsize);
|
|
if (0 != err)
|
|
return err;
|
|
}
|
|
break;
|
|
case V4L2_MEMORY_OVERLAY:
|
|
if (NULL == fbuf)
|
|
return -EINVAL;
|
|
/* FIXME: need sanity checks for vb->boff */
|
|
/*
|
|
* Using a double cast to avoid compiler warnings when
|
|
* building for PAE. Compiler doesn't like direct casting
|
|
* of a 32 bit ptr to 64 bit integer.
|
|
*/
|
|
bus = (dma_addr_t)(unsigned long)fbuf->base + vb->boff;
|
|
pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
|
|
err = videobuf_dma_init_overlay(&mem->dma, DMA_FROM_DEVICE,
|
|
bus, pages);
|
|
if (0 != err)
|
|
return err;
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
err = videobuf_dma_map(q->dev, &mem->dma);
|
|
if (0 != err)
|
|
return err;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __videobuf_sync(struct videobuf_queue *q,
|
|
struct videobuf_buffer *buf)
|
|
{
|
|
struct videobuf_dma_sg_memory *mem = buf->priv;
|
|
BUG_ON(!mem || !mem->dma.sglen);
|
|
|
|
MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
|
|
MAGIC_CHECK(mem->dma.magic, MAGIC_DMABUF);
|
|
|
|
dma_sync_sg_for_cpu(q->dev, mem->dma.sglist,
|
|
mem->dma.sglen, mem->dma.direction);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __videobuf_mmap_mapper(struct videobuf_queue *q,
|
|
struct videobuf_buffer *buf,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
struct videobuf_dma_sg_memory *mem = buf->priv;
|
|
struct videobuf_mapping *map;
|
|
unsigned int first, last, size = 0, i;
|
|
int retval;
|
|
|
|
retval = -EINVAL;
|
|
|
|
BUG_ON(!mem);
|
|
MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
|
|
|
|
/* look for first buffer to map */
|
|
for (first = 0; first < VIDEO_MAX_FRAME; first++) {
|
|
if (buf == q->bufs[first]) {
|
|
size = PAGE_ALIGN(q->bufs[first]->bsize);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* paranoia, should never happen since buf is always valid. */
|
|
if (!size) {
|
|
dprintk(1, "mmap app bug: offset invalid [offset=0x%lx]\n",
|
|
(vma->vm_pgoff << PAGE_SHIFT));
|
|
goto done;
|
|
}
|
|
|
|
last = first;
|
|
|
|
/* create mapping + update buffer list */
|
|
retval = -ENOMEM;
|
|
map = kmalloc(sizeof(struct videobuf_mapping), GFP_KERNEL);
|
|
if (NULL == map)
|
|
goto done;
|
|
|
|
size = 0;
|
|
for (i = first; i <= last; i++) {
|
|
if (NULL == q->bufs[i])
|
|
continue;
|
|
q->bufs[i]->map = map;
|
|
q->bufs[i]->baddr = vma->vm_start + size;
|
|
size += PAGE_ALIGN(q->bufs[i]->bsize);
|
|
}
|
|
|
|
map->count = 1;
|
|
map->q = q;
|
|
vma->vm_ops = &videobuf_vm_ops;
|
|
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: 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:
|
|
return retval;
|
|
}
|
|
|
|
static struct videobuf_qtype_ops sg_ops = {
|
|
.magic = MAGIC_QTYPE_OPS,
|
|
|
|
.alloc_vb = __videobuf_alloc_vb,
|
|
.iolock = __videobuf_iolock,
|
|
.sync = __videobuf_sync,
|
|
.mmap_mapper = __videobuf_mmap_mapper,
|
|
.vaddr = __videobuf_to_vaddr,
|
|
};
|
|
|
|
void *videobuf_sg_alloc(size_t size)
|
|
{
|
|
struct videobuf_queue q;
|
|
|
|
/* Required to make generic handler to call __videobuf_alloc */
|
|
q.int_ops = &sg_ops;
|
|
|
|
q.msize = size;
|
|
|
|
return videobuf_alloc_vb(&q);
|
|
}
|
|
EXPORT_SYMBOL_GPL(videobuf_sg_alloc);
|
|
|
|
void videobuf_queue_sg_init(struct videobuf_queue *q,
|
|
const struct videobuf_queue_ops *ops,
|
|
struct device *dev,
|
|
spinlock_t *irqlock,
|
|
enum v4l2_buf_type type,
|
|
enum v4l2_field field,
|
|
unsigned int msize,
|
|
void *priv,
|
|
struct mutex *ext_lock)
|
|
{
|
|
videobuf_queue_core_init(q, ops, dev, irqlock, type, field, msize,
|
|
priv, &sg_ops, ext_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(videobuf_queue_sg_init);
|
|
|