This patch adds support for importing DMABUF files for
vmalloc allocator in Videobuf2.
Signed-off-by: Tomasz Stanislawski <t.stanislaws@xxxxxxxxxxx>
Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
Acked-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
Acked-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
---
drivers/media/v4l2-core/Kconfig | 1 +
drivers/media/v4l2-core/videobuf2-vmalloc.c | 56 +++++++++++++++++++++++++++
2 files changed, 57 insertions(+)
diff --git a/drivers/media/v4l2-core/Kconfig b/drivers/media/v4l2-core/Kconfig
index e30583b..65875c3 100644
--- a/drivers/media/v4l2-core/Kconfig
+++ b/drivers/media/v4l2-core/Kconfig
@@ -75,6 +75,7 @@ config VIDEOBUF2_VMALLOC
tristate
select VIDEOBUF2_CORE
select VIDEOBUF2_MEMOPS
+ select DMA_SHARED_BUFFER
config VIDEOBUF2_DMA_SG
tristate
diff --git a/drivers/media/v4l2-core/videobuf2-vmalloc.c b/drivers/media/v4l2-core/videobuf2-vmalloc.c
index 94efa04..a47fd4f 100644
--- a/drivers/media/v4l2-core/videobuf2-vmalloc.c
+++ b/drivers/media/v4l2-core/videobuf2-vmalloc.c
@@ -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,
--
1.7.9.5
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