Re: [PATCH 3/3] drm: document the all the atomic iterators

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On Tue, Mar 28, 2017 at 11:53 AM, Daniel Vetter <daniel.vetter@xxxxxxxx> wrote:
> Mostly because I want the links from the newly-added @state functions
> to work. But I think explaining when they're useful and that the
> implicit one is deprecated is good either way. Slightly repetitive
> unfortunately.
>
> Cc: Harry Wentland <harry.wentland@xxxxxxx>
> Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
> Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>

Series is:
Reviewed-by: Alex Deucher <alexander.deucher@xxxxxxx>

> ---
>  include/drm/drm_atomic.h | 159 ++++++++++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 158 insertions(+), 1 deletion(-)
>
> diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h
> index 0147a047878d..fd33ed5eaeb4 100644
> --- a/include/drm/drm_atomic.h
> +++ b/include/drm/drm_atomic.h
> @@ -498,6 +498,23 @@ int __must_check drm_atomic_nonblocking_commit(struct drm_atomic_state *state);
>
>  void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
>
> +/**
> + * for_each_connector_in_state - iterate over all connectors in an atomic update
> + * @__state: &struct drm_atomic_state pointer
> + * @connector: &struct drm_connector iteration cursor
> + * @connector_state: &struct drm_connector_state iteration cursor
> + * @__i: int iteration cursor, for macro-internal use
> + *
> + * This iterates over all connectors in an atomic update. Note that before the
> + * software state is committed (by calling drm_atomic_helper_swap_state(), this
> + * points to the new state, while afterwards it points to the old state. Due to
> + * this tricky confusion this macro is deprecated.
> + *
> + * FIXME:
> + *
> + * Replace all usage of this with one of the explicit iterators below and then
> + * remove this macro.
> + */
>  #define for_each_connector_in_state(__state, connector, connector_state, __i) \
>         for ((__i) = 0;                                                 \
>              (__i) < (__state)->num_connector &&                                \
> @@ -506,6 +523,20 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
>              (__i)++)                                                   \
>                 for_each_if (connector)
>
> +/**
> + * for_each_oldnew_connector_in_state - iterate over all connectors in an atomic update
> + * @__state: &struct drm_atomic_state pointer
> + * @connector: &struct drm_connector iteration cursor
> + * @old_connector_state: &struct drm_connector_state iteration cursor for the
> + *     old state
> + * @new_connector_state: &struct drm_connector_state iteration cursor for the
> + *     new state
> + * @__i: int iteration cursor, for macro-internal use
> + *
> + * This iterates over all connectors in an atomic update, tracking both old and
> + * new state. This is useful in places where the state delta needs to be
> + * considered, for example in atomic check functions.
> + */
>  #define for_each_oldnew_connector_in_state(__state, connector, old_connector_state, new_connector_state, __i) \
>         for ((__i) = 0;                                                         \
>              (__i) < (__state)->num_connector &&                                \
> @@ -515,6 +546,18 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
>              (__i)++)                                                   \
>                 for_each_if (connector)
>
> +/**
> + * for_each_old_connector_in_state - iterate over all connectors in an atomic update
> + * @__state: &struct drm_atomic_state pointer
> + * @connector: &struct drm_connector iteration cursor
> + * @old_connector_state: &struct drm_connector_state iteration cursor for the
> + *     old state
> + * @__i: int iteration cursor, for macro-internal use
> + *
> + * This iterates over all connectors in an atomic update, tracking only the old
> + * state. This is useful in disable functions, where we need the old state the
> + * hardware is still in.
> + */
>  #define for_each_old_connector_in_state(__state, connector, old_connector_state, __i) \
>         for ((__i) = 0;                                                         \
>              (__i) < (__state)->num_connector &&                                \
> @@ -523,6 +566,18 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
>              (__i)++)                                                   \
>                 for_each_if (connector)
>
> +/**
> + * for_each_new_connector_in_state - iterate over all connectors in an atomic update
> + * @__state: &struct drm_atomic_state pointer
> + * @connector: &struct drm_connector iteration cursor
> + * @new_connector_state: &struct drm_connector_state iteration cursor for the
> + *     new state
> + * @__i: int iteration cursor, for macro-internal use
> + *
> + * This iterates over all connectors in an atomic update, tracking only the new
> + * state. This is useful in enable functions, where we need the new state the
> + * hardware should be in when the atomic commit operation has completed.
> + */
>  #define for_each_new_connector_in_state(__state, connector, new_connector_state, __i) \
>         for ((__i) = 0;                                                         \
>              (__i) < (__state)->num_connector &&                                \
> @@ -531,6 +586,23 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
>              (__i)++)                                                   \
>                 for_each_if (connector)
>
> +/**
> + * for_each_crtc_in_state - iterate over all connectors in an atomic update
> + * @__state: &struct drm_atomic_state pointer
> + * @crtc: &struct drm_crtc iteration cursor
> + * @crtc_state: &struct drm_crtc_state iteration cursor
> + * @__i: int iteration cursor, for macro-internal use
> + *
> + * This iterates over all CRTCs in an atomic update. Note that before the
> + * software state is committed (by calling drm_atomic_helper_swap_state(), this
> + * points to the new state, while afterwards it points to the old state. Due to
> + * this tricky confusion this macro is deprecated.
> + *
> + * FIXME:
> + *
> + * Replace all usage of this with one of the explicit iterators below and then
> + * remove this macro.
> + */
>  #define for_each_crtc_in_state(__state, crtc, crtc_state, __i) \
>         for ((__i) = 0;                                         \
>              (__i) < (__state)->dev->mode_config.num_crtc &&    \
> @@ -539,6 +611,18 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
>              (__i)++)                                           \
>                 for_each_if (crtc_state)
>
> +/**
> + * for_each_oldnew_crtc_in_state - iterate over all CRTCs in an atomic update
> + * @__state: &struct drm_atomic_state pointer
> + * @crtc: &struct drm_crtc iteration cursor
> + * @old_crtc_state: &struct drm_crtc_state iteration cursor for the old state
> + * @new_crtc_state: &struct drm_crtc_state iteration cursor for the new state
> + * @__i: int iteration cursor, for macro-internal use
> + *
> + * This iterates over all CRTCs in an atomic update, tracking both old and
> + * new state. This is useful in places where the state delta needs to be
> + * considered, for example in atomic check functions.
> + */
>  #define for_each_oldnew_crtc_in_state(__state, crtc, old_crtc_state, new_crtc_state, __i) \
>         for ((__i) = 0;                                                 \
>              (__i) < (__state)->dev->mode_config.num_crtc &&            \
> @@ -548,6 +632,17 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
>              (__i)++)                                                   \
>                 for_each_if (crtc)
>
> +/**
> + * for_each_old_crtc_in_state - iterate over all CRTCs in an atomic update
> + * @__state: &struct drm_atomic_state pointer
> + * @crtc: &struct drm_crtc iteration cursor
> + * @old_crtc_state: &struct drm_crtc_state iteration cursor for the old state
> + * @__i: int iteration cursor, for macro-internal use
> + *
> + * This iterates over all CRTCs in an atomic update, tracking only the old
> + * state. This is useful in disable functions, where we need the old state the
> + * hardware is still in.
> + */
>  #define for_each_old_crtc_in_state(__state, crtc, old_crtc_state, __i) \
>         for ((__i) = 0;                                                 \
>              (__i) < (__state)->dev->mode_config.num_crtc &&            \
> @@ -556,6 +651,17 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
>              (__i)++)                                                   \
>                 for_each_if (crtc)
>
> +/**
> + * for_each_new_crtc_in_state - iterate over all CRTCs in an atomic update
> + * @__state: &struct drm_atomic_state pointer
> + * @crtc: &struct drm_crtc iteration cursor
> + * @new_crtc_state: &struct drm_crtc_state iteration cursor for the new state
> + * @__i: int iteration cursor, for macro-internal use
> + *
> + * This iterates over all CRTCs in an atomic update, tracking only the new
> + * state. This is useful in enable functions, where we need the new state the
> + * hardware should be in when the atomic commit operation has completed.
> + */
>  #define for_each_new_crtc_in_state(__state, crtc, new_crtc_state, __i) \
>         for ((__i) = 0;                                                 \
>              (__i) < (__state)->dev->mode_config.num_crtc &&            \
> @@ -564,6 +670,23 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
>              (__i)++)                                                   \
>                 for_each_if (crtc)
>
> +/**
> + * for_each_plane_in_state - iterate over all planes in an atomic update
> + * @__state: &struct drm_atomic_state pointer
> + * @plane: &struct drm_plane iteration cursor
> + * @plane_state: &struct drm_plane_state iteration cursor
> + * @__i: int iteration cursor, for macro-internal use
> + *
> + * This iterates over all planes in an atomic update. Note that before the
> + * software state is committed (by calling drm_atomic_helper_swap_state(), this
> + * points to the new state, while afterwards it points to the old state. Due to
> + * this tricky confusion this macro is deprecated.
> + *
> + * FIXME:
> + *
> + * Replace all usage of this with one of the explicit iterators below and then
> + * remove this macro.
> + */
>  #define for_each_plane_in_state(__state, plane, plane_state, __i)              \
>         for ((__i) = 0;                                                 \
>              (__i) < (__state)->dev->mode_config.num_total_plane &&     \
> @@ -572,6 +695,18 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
>              (__i)++)                                                   \
>                 for_each_if (plane_state)
>
> +/**
> + * for_each_oldnew_plane_in_state - iterate over all planes in an atomic update
> + * @__state: &struct drm_atomic_state pointer
> + * @plane: &struct drm_plane iteration cursor
> + * @old_plane_state: &struct drm_plane_state iteration cursor for the old state
> + * @new_plane_state: &struct drm_plane_state iteration cursor for the new state
> + * @__i: int iteration cursor, for macro-internal use
> + *
> + * This iterates over all planes in an atomic update, tracking both old and
> + * new state. This is useful in places where the state delta needs to be
> + * considered, for example in atomic check functions.
> + */
>  #define for_each_oldnew_plane_in_state(__state, plane, old_plane_state, new_plane_state, __i) \
>         for ((__i) = 0;                                                 \
>              (__i) < (__state)->dev->mode_config.num_total_plane &&     \
> @@ -581,6 +716,17 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
>              (__i)++)                                                   \
>                 for_each_if (plane)
>
> +/**
> + * for_each_old_plane_in_state - iterate over all planes in an atomic update
> + * @__state: &struct drm_atomic_state pointer
> + * @plane: &struct drm_plane iteration cursor
> + * @old_plane_state: &struct drm_plane_state iteration cursor for the old state
> + * @__i: int iteration cursor, for macro-internal use
> + *
> + * This iterates over all planes in an atomic update, tracking only the old
> + * state. This is useful in disable functions, where we need the old state the
> + * hardware is still in.
> + */
>  #define for_each_old_plane_in_state(__state, plane, old_plane_state, __i) \
>         for ((__i) = 0;                                                 \
>              (__i) < (__state)->dev->mode_config.num_total_plane &&     \
> @@ -589,6 +735,17 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
>              (__i)++)                                                   \
>                 for_each_if (plane)
>
> +/**
> + * for_each_new_plane_in_state - iterate over all planes in an atomic update
> + * @__state: &struct drm_atomic_state pointer
> + * @plane: &struct drm_plane iteration cursor
> + * @new_plane_state: &struct drm_plane_state iteration cursor for the new state
> + * @__i: int iteration cursor, for macro-internal use
> + *
> + * This iterates over all planes in an atomic update, tracking only the new
> + * state. This is useful in enable functions, where we need the new state the
> + * hardware should be in when the atomic commit operation has completed.
> + */
>  #define for_each_new_plane_in_state(__state, plane, new_plane_state, __i) \
>         for ((__i) = 0;                                                 \
>              (__i) < (__state)->dev->mode_config.num_total_plane &&     \
> @@ -603,7 +760,7 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
>   *
>   * To give drivers flexibility &struct drm_crtc_state has 3 booleans to track
>   * whether the state CRTC changed enough to need a full modeset cycle:
> - * connectors_changed, mode_changed and active_changed. This helper simply
> + * planes_changed, mode_changed and active_changed. This helper simply
>   * combines these three to compute the overall need for a modeset for @state.
>   *
>   * The atomic helper code sets these booleans, but drivers can and should
> --
> 2.11.0
>
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