Re: [Intel-gfx] [PATCH v2 02/19] fbcon: Move fbcon_bmove(_rec) functions

[Thomas Zimmermann <tzimmermann@suse.de>]

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Am 08.02.22 um 22:08 schrieb Daniel Vetter:
> Avoids two forward declarations, and more importantly, matches what
> I've done in my fbcon scrolling restore patches - so I need this to
> avoid a bunch of conflicts in rebasing since we ended up merging
> Helge's series instead.
> 
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> Cc: Helge Deller <deller@gmx.de>
> Cc: Daniel Vetter <daniel@ffwll.ch>
> Cc: Thomas Zimmermann <tzimmermann@suse.de>
> Cc: Du Cheng <ducheng2@gmail.com>
> Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
> Cc: Claudio Suarez <cssk@net-c.es>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Acked-by: Thomas Zimmermann <tzimmermann@suse.de>

> ---
>   drivers/video/fbdev/core/fbcon.c | 134 +++++++++++++++----------------
>   1 file changed, 65 insertions(+), 69 deletions(-)
> 
> diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c
> index 235eaab37d84..e925bb608e25 100644
> --- a/drivers/video/fbdev/core/fbcon.c
> +++ b/drivers/video/fbdev/core/fbcon.c
> @@ -164,15 +164,11 @@ static int fbcon_cursor_noblink;
>    */
>   
>   static void fbcon_clear_margins(struct vc_data *vc, int bottom_only);
> -static void fbcon_bmove(struct vc_data *vc, int sy, int sx, int dy, int dx,
> -			int height, int width);
>   static void fbcon_set_palette(struct vc_data *vc, const unsigned char *table);
>   
>   /*
>    *  Internal routines
>    */
> -static void fbcon_bmove_rec(struct vc_data *vc, struct fbcon_display *p, int sy, int sx,
> -			    int dy, int dx, int height, int width, u_int y_break);
>   static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,
>   			   int unit);
>   static void fbcon_redraw_move(struct vc_data *vc, struct fbcon_display *p,
> @@ -1667,6 +1663,71 @@ static void fbcon_redraw(struct vc_data *vc, struct fbcon_display *p,
>   	}
>   }
>   
> +static void fbcon_bmove_rec(struct vc_data *vc, struct fbcon_display *p, int sy, int sx,
> +			    int dy, int dx, int height, int width, u_int y_break)
> +{
> +	struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
> +	struct fbcon_ops *ops = info->fbcon_par;
> +	u_int b;
> +
> +	if (sy < y_break && sy + height > y_break) {
> +		b = y_break - sy;
> +		if (dy < sy) {	/* Avoid trashing self */
> +			fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
> +					y_break);
> +			fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
> +					height - b, width, y_break);
> +		} else {
> +			fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
> +					height - b, width, y_break);
> +			fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
> +					y_break);
> +		}
> +		return;
> +	}
> +
> +	if (dy < y_break && dy + height > y_break) {
> +		b = y_break - dy;
> +		if (dy < sy) {	/* Avoid trashing self */
> +			fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
> +					y_break);
> +			fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
> +					height - b, width, y_break);
> +		} else {
> +			fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
> +					height - b, width, y_break);
> +			fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
> +					y_break);
> +		}
> +		return;
> +	}
> +	ops->bmove(vc, info, real_y(p, sy), sx, real_y(p, dy), dx,
> +		   height, width);
> +}
> +
> +static void fbcon_bmove(struct vc_data *vc, int sy, int sx, int dy, int dx,
> +			int height, int width)
> +{
> +	struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
> +	struct fbcon_display *p = &fb_display[vc->vc_num];
> +
> +	if (fbcon_is_inactive(vc, info))
> +		return;
> +
> +	if (!width || !height)
> +		return;
> +
> +	/*  Split blits that cross physical y_wrap case.
> +	 *  Pathological case involves 4 blits, better to use recursive
> +	 *  code rather than unrolled case
> +	 *
> +	 *  Recursive invocations don't need to erase the cursor over and
> +	 *  over again, so we use fbcon_bmove_rec()
> +	 */
> +	fbcon_bmove_rec(vc, p, sy, sx, dy, dx, height, width,
> +			p->vrows - p->yscroll);
> +}
> +
>   static bool fbcon_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
>   		enum con_scroll dir, unsigned int count)
>   {
> @@ -1867,71 +1928,6 @@ static bool fbcon_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
>   }
>   
>   
> -static void fbcon_bmove(struct vc_data *vc, int sy, int sx, int dy, int dx,
> -			int height, int width)
> -{
> -	struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
> -	struct fbcon_display *p = &fb_display[vc->vc_num];
> -
> -	if (fbcon_is_inactive(vc, info))
> -		return;
> -
> -	if (!width || !height)
> -		return;
> -
> -	/*  Split blits that cross physical y_wrap case.
> -	 *  Pathological case involves 4 blits, better to use recursive
> -	 *  code rather than unrolled case
> -	 *
> -	 *  Recursive invocations don't need to erase the cursor over and
> -	 *  over again, so we use fbcon_bmove_rec()
> -	 */
> -	fbcon_bmove_rec(vc, p, sy, sx, dy, dx, height, width,
> -			p->vrows - p->yscroll);
> -}
> -
> -static void fbcon_bmove_rec(struct vc_data *vc, struct fbcon_display *p, int sy, int sx,
> -			    int dy, int dx, int height, int width, u_int y_break)
> -{
> -	struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
> -	struct fbcon_ops *ops = info->fbcon_par;
> -	u_int b;
> -
> -	if (sy < y_break && sy + height > y_break) {
> -		b = y_break - sy;
> -		if (dy < sy) {	/* Avoid trashing self */
> -			fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
> -					y_break);
> -			fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
> -					height - b, width, y_break);
> -		} else {
> -			fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
> -					height - b, width, y_break);
> -			fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
> -					y_break);
> -		}
> -		return;
> -	}
> -
> -	if (dy < y_break && dy + height > y_break) {
> -		b = y_break - dy;
> -		if (dy < sy) {	/* Avoid trashing self */
> -			fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
> -					y_break);
> -			fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
> -					height - b, width, y_break);
> -		} else {
> -			fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
> -					height - b, width, y_break);
> -			fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
> -					y_break);
> -		}
> -		return;
> -	}
> -	ops->bmove(vc, info, real_y(p, sy), sx, real_y(p, dy), dx,
> -		   height, width);
> -}
> -
>   static void updatescrollmode_accel(struct fbcon_display *p,
>   					struct fb_info *info,
>   					struct vc_data *vc)

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev

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