[PATCH v6 0/9] Fix cursor planes with virtualized drivers

[Albert Esteve]

v6: Shift DRIVER_CURSOR_HOTSPOT flag bit to BIT(9), since BIT(8)
was already taken by DRIVER_GEM_GPUVA.

v5: Add a change with documentation from Michael, based on his discussion
with Pekka and bump the kernel version DRM_CLIENT_CAP_CURSOR_PLANE_HOTSPOT
might be introduced with to 6.6.

v4: Make drm_plane_create_hotspot_properties static, rename
DRM_CLIENT_CAP_VIRTUALIZED_CURSOR_PLANE to DRM_CLIENT_CAP_CURSOR_PLANE_HOTSPOT
and some minor stylistic fixes for things found by Javier and Pekka
in v3.

v3: Renames, fixes and cleanups suggested by Daniel, Simon and Pekka
after v2. There's no major changes in functionality. Please let me know
if I missed anything, it's been a while since v2.

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).

Link to the IGT test covering this patch (already merged):
https://lists.freedesktop.org/archives/igt-dev/2023-July/058427.html

Mutter patch:
https://lists.freedesktop.org/archives/igt-dev/2023-July/058427.html

Michael Banack (1):
  drm: Introduce documentation for hotspot properties

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_CURSOR_PLANE_HOTSPOT

 Documentation/gpu/drm-kms.rst             |   6 ++
 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               | 120 +++++++++++++++++++++-
 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      |   2 +-
 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                     |   9 ++
 include/drm/drm_file.h                    |  12 +++
 include/drm/drm_framebuffer.h             |  12 ---
 include/drm/drm_plane.h                   |  14 +++
 include/uapi/drm/drm.h                    |  25 +++++
 18 files changed, 245 insertions(+), 39 deletions(-)

-- 
2.41.0