This patchset implements the current proposal for virtio cross-device resource sharing [1], with minor changes based on recent comments (i.e. renumbering the new virtio gpu command and adding a feature flag).
The patchset adds a new flavor of dma-bufs that supports querying the underlying virtio object UUID, as well as adding support for exporting resources from virtgpu. It is expected that this will be used to import virtgpu resources into the virtio-video driver currently under discussion [2].
[1] https://markmail.org/thread/jsaoqy7phrqdcpqu [2] https://markmail.org/thread/p5d3k566srtdtute
David Stevens (2): virtio: add dma-buf support for exported objects drm/virtio: Support virtgpu exported resources
drivers/gpu/drm/virtio/virtgpu_drv.c | 3 + drivers/gpu/drm/virtio/virtgpu_drv.h | 21 +++++ drivers/gpu/drm/virtio/virtgpu_kms.c | 4 + drivers/gpu/drm/virtio/virtgpu_prime.c | 109 ++++++++++++++++++++++++- drivers/gpu/drm/virtio/virtgpu_vq.c | 58 +++++++++++++ drivers/virtio/Makefile | 2 +- drivers/virtio/virtio.c | 6 ++ drivers/virtio/virtio_dma_buf.c | 97 ++++++++++++++++++++++ include/linux/virtio.h | 1 + include/linux/virtio_dma_buf.h | 62 ++++++++++++++ include/uapi/linux/virtio_gpu.h | 19 +++++ 11 files changed, 378 insertions(+), 4 deletions(-) create mode 100644 drivers/virtio/virtio_dma_buf.c create mode 100644 include/linux/virtio_dma_buf.h