[PATCH] drm/plane: drop num_overlay_planes

[Daniel Vetter]

On Fri, Oct 13, 2017 at 09:58:01AM +1000, Dave Airlie wrote:
> From: Dave Airlie <airlied at redhat.com>
> 
> In order to implement plane leasing we need to count things,
> just make the code consistent with the counting code currently
> used for counting crtcs/encoders/connectors and drop the need
> for num_overlay_planes.
> 
> Signed-off-by: Dave Airlie <airlied at redhat.com>

Pls check for intel CI to double-check this, every time I touched this
code I broke something :-/

> ---
>  drivers/gpu/drm/drm_mode_config.c |  1 -
>  drivers/gpu/drm/drm_plane.c       | 45 +++++++++++++--------------------------
>  include/drm/drm_mode_config.h     | 13 -----------
>  3 files changed, 15 insertions(+), 44 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_mode_config.c b/drivers/gpu/drm/drm_mode_config.c
> index 74f6ff5df656..919e78d45ab0 100644
> --- a/drivers/gpu/drm/drm_mode_config.c
> +++ b/drivers/gpu/drm/drm_mode_config.c
> @@ -385,7 +385,6 @@ void drm_mode_config_init(struct drm_device *dev)
>  	dev->mode_config.num_connector = 0;
>  	dev->mode_config.num_crtc = 0;
>  	dev->mode_config.num_encoder = 0;
> -	dev->mode_config.num_overlay_plane = 0;
>  	dev->mode_config.num_total_plane = 0;
>  }
>  EXPORT_SYMBOL(drm_mode_config_init);
> diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
> index 6af02c7b5da3..faa34afa708a 100644
> --- a/drivers/gpu/drm/drm_plane.c
> +++ b/drivers/gpu/drm/drm_plane.c
> @@ -241,8 +241,6 @@ int drm_universal_plane_init(struct drm_device *dev, struct drm_plane *plane,
>  
>  	list_add_tail(&plane->head, &config->plane_list);
>  	plane->index = config->num_total_plane++;
> -	if (plane->type == DRM_PLANE_TYPE_OVERLAY)
> -		config->num_overlay_plane++;
>  
>  	drm_object_attach_property(&plane->base,
>  				   config->plane_type_property,
> @@ -353,8 +351,6 @@ void drm_plane_cleanup(struct drm_plane *plane)
>  
>  	list_del(&plane->head);
>  	dev->mode_config.num_total_plane--;
> -	if (plane->type == DRM_PLANE_TYPE_OVERLAY)
> -		dev->mode_config.num_overlay_plane--;
>  
>  	WARN_ON(plane->state && !plane->funcs->atomic_destroy_state);
>  	if (plane->state && plane->funcs->atomic_destroy_state)
> @@ -462,43 +458,32 @@ int drm_mode_getplane_res(struct drm_device *dev, void *data,
>  	struct drm_mode_config *config;
>  	struct drm_plane *plane;
>  	uint32_t __user *plane_ptr;
> -	int copied = 0;
> -	unsigned num_planes;
> +	int count = 0;
>  
>  	if (!drm_core_check_feature(dev, DRIVER_MODESET))
>  		return -EINVAL;
>  
>  	config = &dev->mode_config;
>  
> -	if (file_priv->universal_planes)
> -		num_planes = config->num_total_plane;
> -	else
> -		num_planes = config->num_overlay_plane;
> -
>  	/*
>  	 * This ioctl is called twice, once to determine how much space is
>  	 * needed, and the 2nd time to fill it.
>  	 */
> -	if (num_planes &&
> -	    (plane_resp->count_planes >= num_planes)) {
> -		plane_ptr = (uint32_t __user *)(unsigned long)plane_resp->plane_id_ptr;
> -
> -		/* Plane lists are invariant, no locking needed. */
> -		drm_for_each_plane(plane, dev) {
> -			/*
> -			 * Unless userspace set the 'universal planes'
> -			 * capability bit, only advertise overlays.
> -			 */
> -			if (plane->type != DRM_PLANE_TYPE_OVERLAY &&
> -			    !file_priv->universal_planes)
> -				continue;
> -
> -			if (put_user(plane->base.id, plane_ptr + copied))
> -				return -EFAULT;
> -			copied++;
> -		}
> +	drm_for_each_plane(plane, dev) {
> +		/*
> +		 * Unless userspace set the 'universal planes'
> +		 * capability bit, only advertise overlays.
> +		 */
> +		if (plane->type != DRM_PLANE_TYPE_OVERLAY &&
> +		    !file_priv->universal_planes)
> +			continue;
> +
> +		if (count < config->num_total_plane &&

Shouldn't this check be count < plane_resp->count_planes? I think we don't
have nasty igts yet to check all these, but since we iirc query first with
num_planes = 0 and nothing allocated this should blow up.

Otherwise looks like a nice cleanup, with the bug fixed:

Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>

> +		    put_user(plane->base.id, plane_ptr + count))
> +			return -EFAULT;
> +		count++;
>  	}
> -	plane_resp->count_planes = num_planes;
> +	plane_resp->count_planes = count;
>  
>  	return 0;
>  }
> diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h
> index 1b37368416c8..0b4ac2ebc610 100644
> --- a/include/drm/drm_mode_config.h
> +++ b/include/drm/drm_mode_config.h
> @@ -429,19 +429,6 @@ struct drm_mode_config {
>  	 */
>  	struct list_head encoder_list;
>  
> -	/**
> -	 * @num_overlay_plane:
> -	 *
> -	 * Number of overlay planes on this device, excluding primary and cursor
> -	 * planes.
> -	 *
> -	 * Track number of overlay planes separately from number of total
> -	 * planes.  By default we only advertise overlay planes to userspace; if
> -	 * userspace sets the "universal plane" capability bit, we'll go ahead
> -	 * and expose all planes. This is invariant over the lifetime of a
> -	 * device and hence doesn't need any locks.
> -	 */
> -	int num_overlay_plane;
>  	/**
>  	 * @num_total_plane:
>  	 *
> -- 
> 2.14.2
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch