On Mon, Mar 02, 2020 at 09:15:21PM +0900, David Stevens wrote:

This change adds a new dma-buf operation that allows dma-bufs to be used by virtio drivers to share exported objects. The new operation allows the importing driver to query the exporting driver for the UUID which identifies the underlying exported object.

Signed-off-by: David Stevens stevensd@chromium.org

drivers/dma-buf/dma-buf.c | 14 ++++++++++++++ include/linux/dma-buf.h | 22 ++++++++++++++++++++++ 2 files changed, 36 insertions(+)

diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index d4097856c86b..a04632284ec2 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -1158,6 +1158,20 @@ void dma_buf_vunmap(struct dma_buf *dmabuf, void *vaddr) } EXPORT_SYMBOL_GPL(dma_buf_vunmap); +#ifdef CONFIG_VIRTIO +int dma_buf_get_uuid(struct dma_buf *dmabuf, uuid_t *uuid)

Hmm, I think I would drop the #ifdef

cheers, Gerd