This patchset implements the current proposal for virtio cross-device resource sharing [1]. It will be used to import virtio resources into the virtio-video driver currently under discussion [2]. The patch under consideration to add support in the virtio-video driver is [3]. It uses the APIs from v3 of this series, but the changes to update it are relatively minor.
This 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.
[1] https://markmail.org/thread/2ypjt5cfeu3m6lxu [2] https://markmail.org/thread/p5d3k566srtdtute [3] https://markmail.org/thread/j4xlqaaim266qpks
v3 -> v4 changes: - Replace dma-buf hooks with virtio dma-buf from v1. - Remove virtio_attach callback, as the work that had been done in that callback is now done on dma-buf export. The documented requirement that get_uuid only be called on attached virtio dma-bufs is also removed. - Rebase and add call to virtio_gpu_notify for ASSIGN_UUID.
David Stevens (3): virtio: add dma-buf support for exported objects virtio-gpu: add VIRTIO_GPU_F_RESOURCE_UUID feature drm/virtio: Support virtgpu exported resources
drivers/gpu/drm/virtio/virtgpu_drv.c | 3 + drivers/gpu/drm/virtio/virtgpu_drv.h | 20 ++++++ drivers/gpu/drm/virtio/virtgpu_kms.c | 4 ++ drivers/gpu/drm/virtio/virtgpu_prime.c | 98 +++++++++++++++++++++++++- drivers/gpu/drm/virtio/virtgpu_vq.c | 55 +++++++++++++++ drivers/virtio/Makefile | 2 +- drivers/virtio/virtio.c | 6 ++ drivers/virtio/virtio_dma_buf.c | 91 ++++++++++++++++++++++++ include/linux/virtio.h | 1 + include/linux/virtio_dma_buf.h | 58 +++++++++++++++ include/uapi/linux/virtio_gpu.h | 19 +++++ 11 files changed, 353 insertions(+), 4 deletions(-) create mode 100644 drivers/virtio/virtio_dma_buf.c create mode 100644 include/linux/virtio_dma_buf.h