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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.c94
1 files changed, 42 insertions, 52 deletions
diff --git a/drivers/media/video/videobuf-dma-sg.c b/drivers/media/video/videobuf-dma-sg.c
index 8359e6badd36..20f227ee2b3e 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, size_t size)
{
struct scatterlist *sglist;
int i;
@@ -100,12 +110,14 @@ struct scatterlist *videobuf_pages_to_sg(struct page **pages, int nr_pages,
/* 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], PAGE_SIZE, 0);
+ 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;
@@ -160,7 +172,8 @@ static int videobuf_dma_init_user_locked(struct videobuf_dmabuf *dma,
first = (data & PAGE_MASK) >> PAGE_SHIFT;
last = ((data+size-1) & PAGE_MASK) >> PAGE_SHIFT;
- dma->offset = data & ~PAGE_MASK;
+ 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)
@@ -201,17 +214,17 @@ 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;
@@ -235,17 +248,17 @@ 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);
if (dma->pages) {
dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages,
- dma->offset);
+ dma->offset, dma->size);
}
- 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 +276,7 @@ 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 +292,14 @@ 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 +322,8 @@ 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 +335,6 @@ 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;
@@ -367,7 +358,7 @@ static void videobuf_vm_close(struct vm_area_struct *vma)
map->count--;
if (0 == map->count) {
dprintk(1, "munmap %p q=%p\n", map, q);
- mutex_lock(&q->vb_lock);
+ videobuf_queue_lock(q);
for (i = 0; i < VIDEO_MAX_FRAME; i++) {
if (NULL == q->bufs[i])
continue;
@@ -383,7 +374,7 @@ static void videobuf_vm_close(struct vm_area_struct *vma)
q->bufs[i]->baddr = 0;
q->ops->buf_release(q, q->bufs[i]);
}
- mutex_unlock(&q->vb_lock);
+ videobuf_queue_unlock(q);
kfree(map);
}
return;
@@ -428,7 +419,7 @@ 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 +447,7 @@ 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 +511,7 @@ 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 +611,6 @@ 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 +627,7 @@ 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 +643,7 @@ 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);
@@ -665,10 +654,11 @@ void videobuf_queue_sg_init(struct videobuf_queue *q,
enum v4l2_buf_type type,
enum v4l2_field field,
unsigned int msize,
- void *priv)
+ void *priv,
+ struct mutex *ext_lock)
{
videobuf_queue_core_init(q, ops, dev, irqlock, type, field, msize,
- priv, &sg_ops);
+ priv, &sg_ops, ext_lock);
}
EXPORT_SYMBOL_GPL(videobuf_queue_sg_init);
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2024-06-03 15:49:58 +0200