[PATCH v2 0/4] drm/atomic: Add accessor macros for all atomic state.

[Maarten Lankhorst]

Second approach. Instead of trying to convert all drivers straight away,
implement all macros that are required to get state working.

Current situation:
Use obj->state, which can refer to old or new state.
Use drm_atomic_get_(existing_)obj_state, which can refer to new or old state.
Use for_each_obj_in_state, which refers to new or old state.

New situation:
When doing some dereferencing outside atomic_state, use
drm_atomic_get_current_obj_state which has locking checks, instead of
obj->state.

During atomic check:
- Use drm_atomic_get_obj_state to add a object to the atomic state,
  or get the new state.
- Use drm_atomic_get_(old/new)_obj_state to peek at the new/old state,
  without adding the object if it's not part of the state. For planes
  and connectors the relevant crtc_state is added, so this will work to
  get the crtc_state from foo_state->crtc too, saves some error handling. :)

During atomic commit:
- Do not use drm_atomic_get_obj_state, obj->state or drm_atomic_get_(existing_)obj_state
  any more, replace with drm_atomic_get_old/new_obj_state calls as required.

During both:
- Use for_each_(new,old,oldnew)_obj_in_state to get the old or new state as needed.
  oldnew will be renamed to for_each_obj_in_state after all callers are converted
  to the new api.

This will give the correct state regardless of swapping.

Maarten Lankhorst (4):
  drm/atomic: Add new iterators over all state, v2.
  drm/atomic: Add accessor macros for the current state.
  drm/atomic: Add macros to access existing old/new state
  drm/atomic: Add checks to ensure get_state is not called after
    swapping.

 drivers/gpu/drm/drm_atomic.c         |  24 +++-
 drivers/gpu/drm/drm_atomic_helper.c  |  47 ++++++-
 drivers/gpu/drm/i915/intel_display.c |  11 +-
 include/drm/drm_atomic.h             | 247 ++++++++++++++++++++++++++++++++++-
 include/drm/drm_atomic_helper.h      |   2 +
 include/drm/drm_modeset_lock.h       |  21 +++
 6 files changed, 338 insertions(+), 14 deletions(-)

-- 
2.7.4