Re: [RFC PATCH] drm/i915: Add a cursor hack to allow converting legacy page flip to atomic.

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On Thu, Nov 24, 2016 at 04:35:35PM +0100, Maarten Lankhorst wrote:
> Do something similar to vc4, only allow updating the cursor state
> in-place through a fastpath when the watermarks are unaffected. This
> will allow cursor movement to be smooth, but changing cursor size or
> showing/hiding cursor will still fall back so watermarks can be updated.
> 
> Not completely tested yet and doesn't handle fence structs well,
> quite likely leaks.. so I'm sending this out as RFC only.
> 
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>

fwiw I think this is the most reasonable short-term path to fix this. Long
term we probably want to codify this (refactoring together with what vc4
has). Didn't review, but

Acked-by: Daniel Vetter <daniel.vetter@xxxxxxxx>

> ---
>  drivers/gpu/drm/i915/intel_atomic_plane.c |  47 +++++++-----
>  drivers/gpu/drm/i915/intel_display.c      | 116 +++++++++++++++++++++++++++++-
>  drivers/gpu/drm/i915/intel_drv.h          |   2 +
>  3 files changed, 146 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_atomic_plane.c b/drivers/gpu/drm/i915/intel_atomic_plane.c
> index dbe9fb41ae53..60d75ce8a989 100644
> --- a/drivers/gpu/drm/i915/intel_atomic_plane.c
> +++ b/drivers/gpu/drm/i915/intel_atomic_plane.c
> @@ -103,36 +103,24 @@ intel_plane_destroy_state(struct drm_plane *plane,
>  	drm_atomic_helper_plane_destroy_state(plane, state);
>  }
>  
> -static int intel_plane_atomic_check(struct drm_plane *plane,
> -				    struct drm_plane_state *state)
> +int intel_plane_atomic_check_with_state(struct intel_crtc_state *crtc_state,
> +					struct intel_plane_state *intel_state)
>  {
> +	struct drm_plane *plane = intel_state->base.plane;
>  	struct drm_i915_private *dev_priv = to_i915(plane->dev);
> -	struct drm_crtc *crtc = state->crtc;
> -	struct intel_crtc *intel_crtc;
> -	struct intel_crtc_state *crtc_state;
> +	struct drm_plane_state *state = &intel_state->base;
>  	struct intel_plane *intel_plane = to_intel_plane(plane);
> -	struct intel_plane_state *intel_state = to_intel_plane_state(state);
> -	struct drm_crtc_state *drm_crtc_state;
>  	int ret;
>  
> -	crtc = crtc ? crtc : plane->state->crtc;
> -	intel_crtc = to_intel_crtc(crtc);
> -
>  	/*
>  	 * Both crtc and plane->crtc could be NULL if we're updating a
>  	 * property while the plane is disabled.  We don't actually have
>  	 * anything driver-specific we need to test in that case, so
>  	 * just return success.
>  	 */
> -	if (!crtc)
> +	if (!intel_state->base.crtc && !plane->state->crtc)
>  		return 0;
>  
> -	drm_crtc_state = drm_atomic_get_existing_crtc_state(state->state, crtc);
> -	if (WARN_ON(!drm_crtc_state))
> -		return -EINVAL;
> -
> -	crtc_state = to_intel_crtc_state(drm_crtc_state);
> -
>  	/* Clip all planes to CRTC size, or 0x0 if CRTC is disabled */
>  	intel_state->clip.x1 = 0;
>  	intel_state->clip.y1 = 0;
> @@ -184,6 +172,31 @@ static int intel_plane_atomic_check(struct drm_plane *plane,
>  	return intel_plane_atomic_calc_changes(&crtc_state->base, state);
>  }
>  
> +static int intel_plane_atomic_check(struct drm_plane *plane,
> +				    struct drm_plane_state *state)
> +{
> +	struct drm_crtc *crtc = state->crtc;
> +	struct drm_crtc_state *drm_crtc_state;
> +
> +	crtc = crtc ? crtc : plane->state->crtc;
> +
> +	/*
> +	 * Both crtc and plane->crtc could be NULL if we're updating a
> +	 * property while the plane is disabled.  We don't actually have
> +	 * anything driver-specific we need to test in that case, so
> +	 * just return success.
> +	 */
> +	if (!crtc)
> +		return 0;
> +
> +	drm_crtc_state = drm_atomic_get_existing_crtc_state(state->state, crtc);
> +	if (WARN_ON(!drm_crtc_state))
> +		return -EINVAL;
> +
> +	return intel_plane_atomic_check_with_state(to_intel_crtc_state(drm_crtc_state),
> +						   to_intel_plane_state(state));
> +}
> +
>  static void intel_plane_atomic_update(struct drm_plane *plane,
>  				      struct drm_plane_state *old_state)
>  {
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index e9741fc8b04e..919d30996f3f 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -14689,7 +14689,7 @@ static const struct drm_crtc_funcs intel_crtc_funcs = {
>  	.set_config = drm_atomic_helper_set_config,
>  	.set_property = drm_atomic_helper_crtc_set_property,
>  	.destroy = intel_crtc_destroy,
> -	.page_flip = intel_crtc_page_flip,
> +	.page_flip = drm_atomic_helper_page_flip,
>  	.atomic_duplicate_state = intel_crtc_duplicate_state,
>  	.atomic_destroy_state = intel_crtc_destroy_state,
>  };
> @@ -14955,6 +14955,118 @@ const struct drm_plane_funcs intel_plane_funcs = {
>  	.atomic_destroy_state = intel_plane_destroy_state,
>  };
>  
> +static int
> +intel_legacy_cursor_update(struct drm_plane *plane,
> +			   struct drm_crtc *crtc,
> +			   struct drm_framebuffer *fb,
> +			   int crtc_x, int crtc_y,
> +			   unsigned int crtc_w, unsigned int crtc_h,
> +			   uint32_t src_x, uint32_t src_y,
> +			   uint32_t src_w, uint32_t src_h)
> +{
> +	struct drm_i915_private *dev_priv = to_i915(crtc->dev);
> +	int ret;
> +	struct drm_plane_state *old_plane_state, *new_plane_state;
> +	struct intel_plane *intel_plane = to_intel_plane(plane);
> +	struct drm_framebuffer *old_fb;
> +
> +	old_plane_state = plane->state;
> +	if (old_plane_state->crtc != crtc ||
> +	    old_plane_state->src_w != src_w ||
> +	    old_plane_state->src_h != src_h ||
> +	    old_plane_state->crtc_w != crtc_w ||
> +	    old_plane_state->crtc_h != crtc_h ||
> +	    !old_plane_state->visible ||
> +	    old_plane_state->fb->modifier != fb->modifier)
> +		goto slow;
> +
> +	new_plane_state = intel_plane_duplicate_state(plane);
> +	if (!new_plane_state)
> +		return -ENOMEM;
> +
> +	drm_atomic_set_fb_for_plane(new_plane_state, fb);
> +
> +	new_plane_state->src_x = src_x;
> +	new_plane_state->src_y = src_y;
> +	new_plane_state->src_w = src_w;
> +	new_plane_state->src_h = src_h;
> +	new_plane_state->crtc_x = crtc_x;
> +	new_plane_state->crtc_y = crtc_y;
> +	new_plane_state->crtc_w = crtc_w;
> +	new_plane_state->crtc_h = crtc_h;
> +
> +	ret = intel_plane_atomic_check_with_state(to_intel_crtc_state(crtc->state),
> +						  to_intel_plane_state(new_plane_state));
> +	if (ret)
> +		return ret;
> +
> +	if (!new_plane_state->visible) {
> +		intel_plane_destroy_state(plane, new_plane_state);
> +		goto slow;
> +	}
> +
> +	ret = mutex_lock_interruptible(&dev_priv->drm.struct_mutex);
> +	if (ret)
> +		return ret;
> +
> +	if (INTEL_INFO(dev_priv)->cursor_needs_physical) {
> +		int align = IS_I830(dev_priv) ? 16 * 1024 : 256;
> +
> +		ret = i915_gem_object_attach_phys(intel_fb_obj(fb), align);
> +		if (ret) {
> +			DRM_DEBUG_KMS("failed to attach phys object\n");
> +			return ret;
> +		}
> +	} else {
> +		struct i915_vma *vma;
> +
> +		vma = intel_pin_and_fence_fb_obj(fb, new_plane_state->rotation);
> +		if (IS_ERR(vma)) {
> +			DRM_DEBUG_KMS("failed to pin object\n");
> +
> +			return PTR_ERR(vma);
> +		}
> +	}
> +
> +	old_fb = old_plane_state->fb;
> +
> +	i915_gem_track_fb(intel_fb_obj(old_fb), intel_fb_obj(fb),
> +			  intel_plane->frontbuffer_bit);
> +
> +	/* Swap plane state */
> +	new_plane_state->state = old_plane_state->state;
> +	*to_intel_plane_state(old_plane_state) = *to_intel_plane_state(new_plane_state);
> +	new_plane_state->state = NULL;
> +	new_plane_state->fb = old_fb;
> +
> +	intel_plane->update_plane(plane,
> +				  to_intel_crtc_state(crtc->state),
> +				  to_intel_plane_state(plane->state));
> +
> +	intel_cleanup_plane_fb(plane, new_plane_state);
> +	mutex_unlock(&dev_priv->drm.struct_mutex);
> +
> +	intel_plane_destroy_state(plane, new_plane_state);
> +
> +	return 0;
> +
> +slow:
> +	return drm_atomic_helper_update_plane(plane, crtc, fb,
> +					      crtc_x, crtc_y, crtc_w, crtc_h,
> +					      src_x, src_y, src_w, src_h);
> +}
> +
> +static const struct drm_plane_funcs intel_cursor_plane_funcs = {
> +	.update_plane = intel_legacy_cursor_update,
> +	.disable_plane = drm_atomic_helper_disable_plane,
> +	.destroy = intel_plane_destroy,
> +	.set_property = drm_atomic_helper_plane_set_property,
> +	.atomic_get_property = intel_plane_atomic_get_property,
> +	.atomic_set_property = intel_plane_atomic_set_property,
> +	.atomic_duplicate_state = intel_plane_duplicate_state,
> +	.atomic_destroy_state = intel_plane_destroy_state,
> +};
> +
>  static struct intel_plane *
>  intel_primary_plane_create(struct drm_i915_private *dev_priv, enum pipe pipe)
>  {
> @@ -15199,7 +15311,7 @@ intel_cursor_plane_create(struct drm_i915_private *dev_priv, enum pipe pipe)
>  	cursor->disable_plane = intel_disable_cursor_plane;
>  
>  	ret = drm_universal_plane_init(&dev_priv->drm, &cursor->base,
> -				       0, &intel_plane_funcs,
> +				       0, &intel_cursor_plane_funcs,
>  				       intel_cursor_formats,
>  				       ARRAY_SIZE(intel_cursor_formats),
>  				       DRM_PLANE_TYPE_CURSOR,
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 8415f2f1117d..25911911c5ef 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -1812,6 +1812,8 @@ struct drm_plane_state *intel_plane_duplicate_state(struct drm_plane *plane);
>  void intel_plane_destroy_state(struct drm_plane *plane,
>  			       struct drm_plane_state *state);
>  extern const struct drm_plane_helper_funcs intel_plane_helper_funcs;
> +int intel_plane_atomic_check_with_state(struct intel_crtc_state *crtc_state,
> +					struct intel_plane_state *intel_state);
>  
>  /* intel_color.c */
>  void intel_color_init(struct drm_crtc *crtc);
> -- 
> 2.7.4
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx

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