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

[Daniel Vetter]

On Wed, Nov 16, 2016 at 02:58:04PM +0100, Maarten Lankhorst wrote:
> 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.

So this is all nice, but fundamentally it's pile of new code with 0 users.
Where are those patches? I think at least converting all the core+helpers
to use it consistently would be needed to justify this.
-Daniel

> 
> 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
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch