linux-kernel - [PATCH v4 0/3] Support virtio cross-device resources

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Date:   Tue, 26 May 2020 19:58:08 +0900
From:   David Stevens <stevensd@...omium.org>
To:     Gerd Hoffmann <kraxel@...hat.com>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Sumit Semwal <sumit.semwal@...aro.org>
Cc:     "Michael S . Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Stevens <stevensd@...omium.org>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        virtualization@...ts.linux-foundation.org,
        linux-media@...r.kernel.org, linaro-mm-sig@...ts.linaro.org,
        virtio-dev@...ts.oasis-open.org
Subject: [PATCH v4 0/3] Support virtio cross-device resources

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

-- 
2.27.0.rc0.183.gde8f92d652-goog