Re: [Intel-gfx] [PATCH 16/23] drm/i915/intel_fb: Factor out calc_plane_normal_size()

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Thu, Mar 11, 2021 at 12:17:29AM +0200, Imre Deak wrote:
> Factor out to a new function the logic to calculate an FB plane's
> normal-view size.
> 
> Instead of using intel_remapped_plane_info, which is related only to
> remapping, add a helper to get the tile pitch and rows for an FB plane,
> so these helpers can be used both by the normal size calculation and the
> remapping code.
> 
> Also add a new fb_plane_view_dims struct in which we can pass around the
> view (either FB plane or plane source) and tile dimensions conveniently
> to functions calculating further view parameters.
> 
> Signed-off-by: Imre Deak <imre.deak@intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_fb.c | 82 ++++++++++++++++++-------
>  1 file changed, 61 insertions(+), 21 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_fb.c b/drivers/gpu/drm/i915/display/intel_fb.c
> index 62a8e37dca38..f661b21b119d 100644
> --- a/drivers/gpu/drm/i915/display/intel_fb.c
> +++ b/drivers/gpu/drm/i915/display/intel_fb.c
> @@ -634,6 +634,59 @@ static u32 setup_fb_rotation(int plane, const struct intel_remapped_plane_info *
>  	return plane_info->width * plane_info->height;
>  }
>  
> +struct fb_plane_view_dims {
> +	unsigned int width, height;
> +	unsigned int tile_width, tile_height;
> +};
> +
> +static void init_plane_view_dims(const struct intel_framebuffer *fb, int color_plane,
> +				 unsigned int width, unsigned int height,
> +				 struct fb_plane_view_dims *dims)
> +{
> +	dims->width = width;
> +	dims->height = height;
> +
> +	intel_tile_dims(&fb->base, color_plane, &dims->tile_width, &dims->tile_height);
> +}
> +
> +static unsigned int plane_view_stride_tiles(const struct intel_framebuffer *fb, int color_plane,
> +					    const struct fb_plane_view_dims *dims)
> +{
> +	const struct drm_framebuffer *drm_fb = &fb->base;
> +
> +	return DIV_ROUND_UP(drm_fb->pitches[color_plane],
> +			    dims->tile_width * drm_fb->format->cpp[color_plane]);

plane_view_fb_stride_tiles() maybe to make it clear it's the fb stride
we're talking about here?

> +}
> +
> +static unsigned int plane_view_tile_rows(const struct intel_framebuffer *fb, int color_plane,
> +					 const struct fb_plane_view_dims *dims,
> +					 int y)
> +{
> +	return DIV_ROUND_UP(y + dims->height, dims->tile_height);
> +}
> +
> +static int calc_plane_normal_size(const struct intel_framebuffer *fb, int color_plane,
> +				  const struct fb_plane_view_dims *dims,
> +				  int x, int y)
> +{
> +	const struct drm_framebuffer *drm_fb = &fb->base;
> +	struct drm_i915_private *i915 = to_i915(drm_fb->dev);
> +	int pages;

'tiles'?

> +
> +	if (is_surface_linear(drm_fb, color_plane)) {
> +		unsigned int size;
> +
> +		size = (y + dims->height) * drm_fb->pitches[color_plane] +
> +		       x * drm_fb->format->cpp[color_plane];
> +		pages = DIV_ROUND_UP(size, intel_tile_size(i915));
> +	} else {
> +		pages = plane_view_stride_tiles(fb, color_plane, dims) *
> +			plane_view_tile_rows(fb, color_plane, dims, y);
> +	}
> +
> +	return pages;
> +}
> +
>  int intel_fill_fb_info(struct drm_i915_private *i915, struct drm_framebuffer *fb)
>  {
>  	struct intel_framebuffer *intel_fb = to_intel_framebuffer(fb);
> @@ -644,6 +697,7 @@ int intel_fill_fb_info(struct drm_i915_private *i915, struct drm_framebuffer *fb
>  	unsigned int tile_size = intel_tile_size(i915);
>  
>  	for (i = 0; i < num_planes; i++) {
> +		struct fb_plane_view_dims view_dims;
>  		unsigned int width, height;
>  		unsigned int cpp, size;
>  		u32 offset;
> @@ -669,6 +723,8 @@ int intel_fill_fb_info(struct drm_i915_private *i915, struct drm_framebuffer *fb
>  		if (ret)
>  			return ret;
>  
> +		init_plane_view_dims(intel_fb, i, width, height, &view_dims);
> +
>  		/*
>  		 * First pixel of the framebuffer from
>  		 * the start of the normal gtt mapping.
> @@ -680,38 +736,22 @@ int intel_fill_fb_info(struct drm_i915_private *i915, struct drm_framebuffer *fb
>  
>  		if (!is_surface_linear(fb, i)) {
>  			struct intel_remapped_plane_info plane_info;
> -			unsigned int tile_width, tile_height;
> -
> -			intel_tile_dims(fb, i, &tile_width, &tile_height);
>  
>  			plane_info.offset = offset;
> -			plane_info.stride = DIV_ROUND_UP(fb->pitches[i],
> -							 tile_width * cpp);
> -			plane_info.width = DIV_ROUND_UP(x + width, tile_width);
> -			plane_info.height = DIV_ROUND_UP(y + height,
> -							 tile_height);
> -
> -			/* how many tiles does this plane need */
> -			size = plane_info.stride * plane_info.height;
> -			/*
> -			 * If the plane isn't horizontally tile aligned,
> -			 * we need one more tile.
> -			 */
> -			if (x != 0)
> -				size++;

Where did that go?

> +			plane_info.stride = plane_view_stride_tiles(intel_fb, i, &view_dims);
> +			plane_info.width = DIV_ROUND_UP(x + width, view_dims.tile_width);

Why this doesn't have its own function?

> +			plane_info.height = plane_view_tile_rows(intel_fb, i, &view_dims, y);
>  
>  			gtt_offset_rotated +=
>  				setup_fb_rotation(i, &plane_info,
>  						  gtt_offset_rotated,
>  						  x, y, width, height,
>  						  tile_size,
> -						  tile_width, tile_height,
> +						  view_dims.tile_width, view_dims.tile_height,
>  						  fb);
> -		} else {
> -			size = DIV_ROUND_UP((y + height) * fb->pitches[i] +
> -					    x * cpp, tile_size);
>  		}
>  
> +		size = calc_plane_normal_size(intel_fb, i, &view_dims, x, y);
>  		/* how many tiles in total needed in the bo */
>  		max_size = max(max_size, offset + size);
>  	}
> -- 
> 2.25.1
> 
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-- 
Ville Syrjälä
Intel
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