Functions in the atomic commit tail are not allowed to acquire the
dmabuf's reservation lock. So we cannot legally call the GEM object's
vmap functionality in atomic_update.
But, much better, we can use drm_shadow_plane_state to do all the mapping
for us. Patch 1 exports the helpers for shadow-buffered planes from the
DRM KMS helper library and adds documentation on how to use them. Patch 2
replaces the vmap code in vbox' cursor update code with a the helpers for
shadow-buffered planes.
v3:
* documentation fixes (Daniel)
v2:
* rebuilt with shadow-buffered planes
Thomas Zimmermann (2):
drm/gem: Export helpers for shadow-buffered planes
drm/vboxvideo: Implement cursor plane with struct
drm_shadow_plane_state
drivers/gpu/drm/drm_gem_atomic_helper.c | 148 +++++++++++++++++++++++-
drivers/gpu/drm/vboxvideo/vbox_mode.c | 28 ++---
include/drm/drm_gem_atomic_helper.h | 32 +++++
3 files changed, 181 insertions(+), 27 deletions(-)
--
2.30.0
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