[PATCH v2 0/8] Fix cursor planes with virtualized drivers

[Zack Rusin <zack@kde.org>]

From: Zack Rusin <zackr@vmware.com>

Virtualized drivers have had a lot of issues with cursor support on top
of atomic modesetting. This set both fixes the long standing problems
with atomic kms and virtualized drivers and adds code to let userspace
use atomic kms on virtualized drivers while preserving functioning
seamless cursors between the host and guest.

The first change in the set is one that should be backported as far as
possible, likely 5.4 stable, because earlier stable kernels do not have
virtualbox driver. The change makes virtualized drivers stop exposing
a cursor plane for atomic clients, this fixes mouse cursor on all well
formed compositors which will automatically fallback to software cursor.

The rest of the changes until the last one ports the legacy hotspot code
to atomic plane properties.

Finally the last change introduces userspace API to let userspace
clients advertise the fact that they are aware of additional restrictions
placed upon the cursor plane by virtualized drivers and lets them use
atomic kms with virtualized drivers (the clients are expected to set
hotspots correctly when advertising support for virtual cursor plane).

Zack Rusin (8):
  drm: Disable the cursor plane on atomic contexts with virtualized
    drivers
  drm/atomic: Add support for mouse hotspots
  drm/vmwgfx: Use the hotspot properties from cursor planes
  drm/qxl: Use the hotspot properties from cursor planes
  drm/vboxvideo: Use the hotspot properties from cursor planes
  drm/virtio: Use the hotspot properties from cursor planes
  drm: Remove legacy cursor hotspot code
  drm: Introduce DRM_CLIENT_CAP_SUPPORTS_VIRTUAL_CURSOR_PLANE

 drivers/gpu/drm/drm_atomic_state_helper.c | 14 ++++++
 drivers/gpu/drm/drm_atomic_uapi.c         | 20 ++++++++
 drivers/gpu/drm/drm_ioctl.c               |  9 ++++
 drivers/gpu/drm/drm_plane.c               | 59 ++++++++++++++++++++++-
 drivers/gpu/drm/qxl/qxl_display.c         | 14 +++---
 drivers/gpu/drm/qxl/qxl_drv.c             |  2 +-
 drivers/gpu/drm/vboxvideo/vbox_drv.c      |  2 +-
 drivers/gpu/drm/vboxvideo/vbox_mode.c     |  4 +-
 drivers/gpu/drm/virtio/virtgpu_drv.c      |  3 +-
 drivers/gpu/drm/virtio/virtgpu_plane.c    |  8 +--
 drivers/gpu/drm/vmwgfx/vmwgfx_drv.c       |  2 +-
 drivers/gpu/drm/vmwgfx/vmwgfx_kms.c       |  9 +---
 include/drm/drm_drv.h                     | 10 ++++
 include/drm/drm_file.h                    | 12 +++++
 include/drm/drm_framebuffer.h             | 12 -----
 include/drm/drm_plane.h                   | 15 ++++++
 include/uapi/drm/drm.h                    | 17 +++++++
 17 files changed, 173 insertions(+), 39 deletions(-)

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2.34.1