For dmabuf import users to be able to use the vaddr from another
videobuf2-dma-sg source, the exporter needs to set a proper vaddr on
vb2_dma_sg_dmabuf_ops_vmap callback.
This patch adds vm_map_ram on map if buf->vaddr was not set, and also
adds the vb2_dma_sg_dmabuf_ops_vunmap function to remove the mapping
afterwards.
Cc: stable <stable@xxxxxxxxxx>
Signed-off-by: Michael Grzeschik <m.grzeschik@xxxxxxxxxxxxxx>
---
drivers/media/common/videobuf2/videobuf2-dma-sg.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/drivers/media/common/videobuf2/videobuf2-dma-sg.c b/drivers/media/common/videobuf2/videobuf2-dma-sg.c
index fa69158a65b1fd..8d6e154bbbc8b0 100644
--- a/drivers/media/common/videobuf2/videobuf2-dma-sg.c
+++ b/drivers/media/common/videobuf2/videobuf2-dma-sg.c
@@ -496,11 +496,25 @@ static int vb2_dma_sg_dmabuf_ops_vmap(struct dma_buf *dbuf,
{
struct vb2_dma_sg_buf *buf = dbuf->priv;
+ if (!buf->vaddr)
+ buf->vaddr = vm_map_ram(buf->pages, buf->num_pages, -1);
+
iosys_map_set_vaddr(map, buf->vaddr);
return 0;
}
+static void vb2_dma_sg_dmabuf_ops_vunmap(struct dma_buf *dbuf,
+ struct iosys_map *map)
+{
+ struct vb2_dma_sg_buf *buf = dbuf->priv;
+
+ if (buf->vaddr)
+ vm_unmap_ram(buf->vaddr, buf->num_pages);
+
+ buf->vaddr = NULL;
+}
+
static int vb2_dma_sg_dmabuf_ops_mmap(struct dma_buf *dbuf,
struct vm_area_struct *vma)
{
@@ -515,6 +529,7 @@ static const struct dma_buf_ops vb2_dma_sg_dmabuf_ops = {
.begin_cpu_access = vb2_dma_sg_dmabuf_ops_begin_cpu_access,
.end_cpu_access = vb2_dma_sg_dmabuf_ops_end_cpu_access,
.vmap = vb2_dma_sg_dmabuf_ops_vmap,
+ .vunmap = vb2_dma_sg_dmabuf_ops_vunmap,
.mmap = vb2_dma_sg_dmabuf_ops_mmap,
.release = vb2_dma_sg_dmabuf_ops_release,
};
--
2.30.2
