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path: root/drivers/media/video/videobuf-dma-sg.c
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Diffstat (limited to 'drivers/media/video/videobuf-dma-sg.c')
-rw-r--r--drivers/media/video/videobuf-dma-sg.c76
1 files changed, 31 insertions, 45 deletions
diff --git a/drivers/media/video/videobuf-dma-sg.c b/drivers/media/video/videobuf-dma-sg.c
index 8359e6badd3..06f9a9c2a39 100644
--- a/drivers/media/video/videobuf-dma-sg.c
+++ b/drivers/media/video/videobuf-dma-sg.c
@@ -57,7 +57,13 @@ MODULE_LICENSE("GPL");
/* --------------------------------------------------------------------- */
-struct scatterlist *videobuf_vmalloc_to_sg(unsigned char *virt, int nr_pages)
+/*
+ * 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;
@@ -81,10 +87,14 @@ err:
vfree(sglist);
return NULL;
}
-EXPORT_SYMBOL_GPL(videobuf_vmalloc_to_sg);
-struct scatterlist *videobuf_pages_to_sg(struct page **pages, int nr_pages,
- int offset)
+/*
+ * 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)
{
struct scatterlist *sglist;
int i;
@@ -201,17 +211,17 @@ int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction,
dprintk(1, "init kernel [%d pages]\n", nr_pages);
dma->direction = direction;
- dma->vmalloc = vmalloc_32(nr_pages << PAGE_SHIFT);
- if (NULL == dma->vmalloc) {
+ 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->vmalloc,
+ (unsigned long)dma->vaddr,
nr_pages << PAGE_SHIFT);
- memset(dma->vmalloc, 0, nr_pages << PAGE_SHIFT);
+ memset(dma->vaddr, 0, nr_pages << PAGE_SHIFT);
dma->nr_pages = nr_pages;
return 0;
@@ -235,7 +245,7 @@ int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction,
}
EXPORT_SYMBOL_GPL(videobuf_dma_init_overlay);
-int videobuf_dma_map(struct videobuf_queue *q, struct videobuf_dmabuf *dma)
+int videobuf_dma_map(struct device *dev, struct videobuf_dmabuf *dma)
{
MAGIC_CHECK(dma->magic, MAGIC_DMABUF);
BUG_ON(0 == dma->nr_pages);
@@ -244,8 +254,8 @@ int videobuf_dma_map(struct videobuf_queue *q, struct videobuf_dmabuf *dma)
dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages,
dma->offset);
}
- if (dma->vmalloc) {
- dma->sglist = videobuf_vmalloc_to_sg(dma->vmalloc,
+ if (dma->vaddr) {
+ dma->sglist = videobuf_vmalloc_to_sg(dma->vaddr,
dma->nr_pages);
}
if (dma->bus_addr) {
@@ -263,7 +273,7 @@ int videobuf_dma_map(struct videobuf_queue *q, struct videobuf_dmabuf *dma)
return -ENOMEM;
}
if (!dma->bus_addr) {
- dma->sglen = dma_map_sg(q->dev, dma->sglist,
+ dma->sglen = dma_map_sg(dev, dma->sglist,
dma->nr_pages, dma->direction);
if (0 == dma->sglen) {
printk(KERN_WARNING
@@ -279,14 +289,14 @@ int videobuf_dma_map(struct videobuf_queue *q, struct videobuf_dmabuf *dma)
}
EXPORT_SYMBOL_GPL(videobuf_dma_map);
-int videobuf_dma_unmap(struct videobuf_queue *q, struct videobuf_dmabuf *dma)
+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(q->dev, dma->sglist, dma->sglen, dma->direction);
+ dma_unmap_sg(dev, dma->sglist, dma->sglen, dma->direction);
vfree(dma->sglist);
dma->sglist = NULL;
@@ -309,8 +319,8 @@ int videobuf_dma_free(struct videobuf_dmabuf *dma)
dma->pages = NULL;
}
- vfree(dma->vmalloc);
- dma->vmalloc = NULL;
+ vfree(dma->vaddr);
+ dma->vaddr = NULL;
if (dma->bus_addr)
dma->bus_addr = 0;
@@ -322,28 +332,6 @@ EXPORT_SYMBOL_GPL(videobuf_dma_free);
/* --------------------------------------------------------------------- */
-int videobuf_sg_dma_map(struct device *dev, struct videobuf_dmabuf *dma)
-{
- struct videobuf_queue q;
-
- q.dev = dev;
-
- return videobuf_dma_map(&q, dma);
-}
-EXPORT_SYMBOL_GPL(videobuf_sg_dma_map);
-
-int videobuf_sg_dma_unmap(struct device *dev, struct videobuf_dmabuf *dma)
-{
- struct videobuf_queue q;
-
- q.dev = dev;
-
- return videobuf_dma_unmap(&q, dma);
-}
-EXPORT_SYMBOL_GPL(videobuf_sg_dma_unmap);
-
-/* --------------------------------------------------------------------- */
-
static void videobuf_vm_open(struct vm_area_struct *vma)
{
struct videobuf_mapping *map = vma->vm_private_data;
@@ -428,7 +416,7 @@ static const struct vm_operations_struct videobuf_vm_ops = {
struct videobuf_dma_sg_memory
*/
-static struct videobuf_buffer *__videobuf_alloc(size_t size)
+static struct videobuf_buffer *__videobuf_alloc_vb(size_t size)
{
struct videobuf_dma_sg_memory *mem;
struct videobuf_buffer *vb;
@@ -456,7 +444,7 @@ static void *__videobuf_to_vaddr(struct videobuf_buffer *buf)
MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
- return mem->dma.vmalloc;
+ return mem->dma.vaddr;
}
static int __videobuf_iolock(struct videobuf_queue *q,
@@ -520,7 +508,7 @@ static int __videobuf_iolock(struct videobuf_queue *q,
default:
BUG();
}
- err = videobuf_dma_map(q, &mem->dma);
+ err = videobuf_dma_map(q->dev, &mem->dma);
if (0 != err)
return err;
@@ -620,8 +608,6 @@ static int __videobuf_mmap_mapper(struct videobuf_queue *q,
}
map->count = 1;
- map->start = vma->vm_start;
- map->end = vma->vm_end;
map->q = q;
vma->vm_ops = &videobuf_vm_ops;
vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED;
@@ -638,7 +624,7 @@ done:
static struct videobuf_qtype_ops sg_ops = {
.magic = MAGIC_QTYPE_OPS,
- .alloc = __videobuf_alloc,
+ .alloc_vb = __videobuf_alloc_vb,
.iolock = __videobuf_iolock,
.sync = __videobuf_sync,
.mmap_mapper = __videobuf_mmap_mapper,
@@ -654,7 +640,7 @@ void *videobuf_sg_alloc(size_t size)
q.msize = size;
- return videobuf_alloc(&q);
+ return videobuf_alloc_vb(&q);
}
EXPORT_SYMBOL_GPL(videobuf_sg_alloc);