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[media] v4l: vb2-vmalloc: add support for dmabuf importing 

This patch adds support for importing DMABUF files for
vmalloc allocator in Videobuf2.

Signed-off-by: Tomasz Stanislawski <t.stanislaws@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Tested-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Tomasz Stanislawski 2012-06-14 10:37:46 -03:00 committed by Mauro Carvalho Chehab
parent 8c417d03a8
commit 89d2ee0890
2 changed files with 57 additions and 0 deletions
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1
drivers/media/v4l2-core/Kconfig
View File

@ -75,6 +75,7 @@ config VIDEOBUF2_VMALLOC
tristate
select VIDEOBUF2_CORE
select VIDEOBUF2_MEMOPS
select DMA_SHARED_BUFFER
config VIDEOBUF2_DMA_SG
tristate

56
drivers/media/v4l2-core/videobuf2-vmalloc.c
View File

@ -30,6 +30,7 @@ struct vb2_vmalloc_buf {
unsigned int n_pages;
atomic_t refcount;
struct vb2_vmarea_handler handler;
struct dma_buf *dbuf;
};
static void vb2_vmalloc_put(void *buf_priv);
@ -207,11 +208,66 @@ static int vb2_vmalloc_mmap(void *buf_priv, struct vm_area_struct *vma)
return 0;
}
/*********************************************/
/* callbacks for DMABUF buffers */
/*********************************************/
static int vb2_vmalloc_map_dmabuf(void *mem_priv)
{
struct vb2_vmalloc_buf *buf = mem_priv;
buf->vaddr = dma_buf_vmap(buf->dbuf);
return buf->vaddr ? 0 : -EFAULT;
}
static void vb2_vmalloc_unmap_dmabuf(void *mem_priv)
{
struct vb2_vmalloc_buf *buf = mem_priv;
dma_buf_vunmap(buf->dbuf, buf->vaddr);
buf->vaddr = NULL;
}
static void vb2_vmalloc_detach_dmabuf(void *mem_priv)
{
struct vb2_vmalloc_buf *buf = mem_priv;
if (buf->vaddr)
dma_buf_vunmap(buf->dbuf, buf->vaddr);
kfree(buf);
}
static void *vb2_vmalloc_attach_dmabuf(void *alloc_ctx, struct dma_buf *dbuf,
unsigned long size, int write)
{
struct vb2_vmalloc_buf *buf;
if (dbuf->size < size)
return ERR_PTR(-EFAULT);
buf = kzalloc(sizeof(*buf), GFP_KERNEL);
if (!buf)
return ERR_PTR(-ENOMEM);
buf->dbuf = dbuf;
buf->write = write;
buf->size = size;
return buf;
}
const struct vb2_mem_ops vb2_vmalloc_memops = {
.alloc = vb2_vmalloc_alloc,
.put = vb2_vmalloc_put,
.get_userptr = vb2_vmalloc_get_userptr,
.put_userptr = vb2_vmalloc_put_userptr,
.map_dmabuf = vb2_vmalloc_map_dmabuf,
.unmap_dmabuf = vb2_vmalloc_unmap_dmabuf,
.attach_dmabuf = vb2_vmalloc_attach_dmabuf,
.detach_dmabuf = vb2_vmalloc_detach_dmabuf,
.vaddr = vb2_vmalloc_vaddr,
.mmap = vb2_vmalloc_mmap,
.num_users = vb2_vmalloc_num_users,