Re: [PATCH 1/1] drm: Add dirty_rects atomic blob property for drm_plane

[Daniel Vetter <daniel@ffwll.ch>]

On Thu, Dec 21, 2017 at 02:46:55PM +0200, Ville Syrjälä wrote:
> On Thu, Dec 21, 2017 at 12:10:08PM +0100, Lukasz Spintzyk wrote:
> > Change-Id: I63dce004f8d3c5dc6a7c71070f1fab0707286ea5
> > Signed-off-by: Lukasz Spintzyk <lukasz.spintzyk@displaylink.com>
> > ---
> >  drivers/gpu/drm/drm_atomic.c      | 10 ++++++++++
> >  drivers/gpu/drm/drm_mode_config.c |  6 ++++++
> >  drivers/gpu/drm/drm_plane.c       |  1 +
> >  include/drm/drm_mode_config.h     |  5 +++++
> >  include/drm/drm_plane.h           |  3 +++
> >  5 files changed, 25 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
> > index b76d49218cf1..cd3b4ed7b04c 100644
> > --- a/drivers/gpu/drm/drm_atomic.c
> > +++ b/drivers/gpu/drm/drm_atomic.c
> > @@ -759,6 +759,14 @@ static int drm_atomic_plane_set_property(struct drm_plane *plane,
> >  		state->rotation = val;
> >  	} else if (property == plane->zpos_property) {
> >  		state->zpos = val;
> > +	} else if (property == config->dirty_rects_property) {
> > +		bool replaced = false;
> > +		int ret = drm_atomic_replace_property_blob_from_id(dev,
> > +					&state->dirty_blob,
> > +					val,
> > +					-1,
> > +					&replaced);
> > +		return ret;
> >  	} else if (plane->funcs->atomic_set_property) {
> >  		return plane->funcs->atomic_set_property(plane, state,
> >  				property, val);
> > @@ -818,6 +826,8 @@ drm_atomic_plane_get_property(struct drm_plane *plane,
> >  		*val = state->rotation;
> >  	} else if (property == plane->zpos_property) {
> >  		*val = state->zpos;
> > +	} else if (property == config->dirty_rects_property) {
> > +		*val = (state->dirty_blob) ? state->dirty_blob->base.id : 0;
> >  	} else if (plane->funcs->atomic_get_property) {
> >  		return plane->funcs->atomic_get_property(plane, state, property, val);
> >  	} else {
> > diff --git a/drivers/gpu/drm/drm_mode_config.c b/drivers/gpu/drm/drm_mode_config.c
> > index bc5c46306b3d..d5f1021c6ece 100644
> > --- a/drivers/gpu/drm/drm_mode_config.c
> > +++ b/drivers/gpu/drm/drm_mode_config.c
> > @@ -293,6 +293,12 @@ static int drm_mode_create_standard_properties(struct drm_device *dev)
> >  		return -ENOMEM;
> >  	dev->mode_config.prop_crtc_id = prop;
> >  
> > +	prop = drm_property_create(dev, DRM_MODE_PROP_BLOB,
> > +			"DIRTY_RECTS", 0);
> > +	if (!prop)
> > +		return -ENOMEM;
> > +	dev->mode_config.dirty_rects_property = prop;
> > +
> >  	prop = drm_property_create_bool(dev, DRM_MODE_PROP_ATOMIC,
> >  			"ACTIVE");
> >  	if (!prop)
> > diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
> > index 37a93cdffb4a..add110f025e5 100644
> > --- a/drivers/gpu/drm/drm_plane.c
> > +++ b/drivers/gpu/drm/drm_plane.c
> > @@ -258,6 +258,7 @@ int drm_universal_plane_init(struct drm_device *dev, struct drm_plane *plane,
> >  		drm_object_attach_property(&plane->base, config->prop_src_y, 0);
> >  		drm_object_attach_property(&plane->base, config->prop_src_w, 0);
> >  		drm_object_attach_property(&plane->base, config->prop_src_h, 0);
> > +		drm_object_attach_property(&plane->base, config->dirty_rects_property, 0);
> >  	}
> >  
> >  	if (config->allow_fb_modifiers)
> > diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h
> > index e5f3b43014e1..65f64eb04c0c 100644
> > --- a/include/drm/drm_mode_config.h
> > +++ b/include/drm/drm_mode_config.h
> > @@ -599,6 +599,11 @@ struct drm_mode_config {
> >  	 * &drm_crtc.
> >  	 */
> >  	struct drm_property *prop_crtc_id;
> > +	/**
> > +	 * @dirty_rects_property: Optional plane property to mark damaged
> > +	 * regions on the plane framebuffer.
> 
> What exactly would the blob contain?
> 
> The comment seems to be implying these are in fb coordiantes as
> opposed to plane crtc coordinates? Not sure which would be more
> convenient. At least if they're fb coordinates then you probably
> want some helpers to translate/rotate/scale those rects to the
> crtc coordinates. Actual use depends on the driver/hw I suppose.

Yeah I think we also should add a decoded state to the drm_plane_state,
which has the full structure and all the details.

And when we discussed this iirc we've identified a clear need for at least
some drivers to deal in crtc dirty rectangles. I think the initial core
support should include a helper which takes an atomic update for a given
crtc, and converts all the plane dirty rectangles into crtc rectangles.
Including any full-plane or full-crtc upgrades needed due to e.g.
reposition, changed gamma, changed blendign/zpos or anything else really
that would affect the entire plane respectively crtc. That would also
provide a really good model for what damage actually means.

Plus ofc we need userspace for this, preferrably as a patch to something
generic like weston or xfree86-video-modesetting. And an example kernel
implementation.

Cheers, Daniel

> 
> > +	 */
> > +	struct drm_property *dirty_rects_property;
> >  	/**
> >  	 * @prop_active: Default atomic CRTC property to control the active
> >  	 * state, which is the simplified implementation for DPMS in atomic
> > diff --git a/include/drm/drm_plane.h b/include/drm/drm_plane.h
> > index 8185e3468a23..7d45b164ccce 100644
> > --- a/include/drm/drm_plane.h
> > +++ b/include/drm/drm_plane.h
> > @@ -131,6 +131,9 @@ struct drm_plane_state {
> >  	 */
> >  	struct drm_crtc_commit *commit;
> >  
> > +	/* Optional blob property with damaged regions. */
> > +	struct drm_property_blob *dirty_blob;
> > +
> >  	struct drm_atomic_state *state;
> >  };
> >  
> > -- 
> > 2.15.1
> > 
> > _______________________________________________
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> > https://lists.freedesktop.org/mailman/listinfo/dri-devel
> 
> -- 
> Ville Syrjälä
> Intel OTC
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

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