[PATCH 3/3] fbcon: use __iowrite{32/64} to speedup the framebuffer console scrolling

[Sascha Hauer]

On Thu, Mar 09, 2017 at 11:31:11AM +0100, Jean-Christophe PLAGNIOL-VILLARD wrote:
> this devide the time by 4 on x86
> 
> Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj at jcrosoft.com>
> ---
>  drivers/video/fbconsole.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/video/fbconsole.c b/drivers/video/fbconsole.c
> index b261f1704..b5e951e23 100644
> --- a/drivers/video/fbconsole.c
> +++ b/drivers/video/fbconsole.c
> @@ -6,6 +6,7 @@
>  #include <gui/image_renderer.h>
>  #include <gui/graphic_utils.h>
>  #include <linux/font.h>
> +#include <linux/io.h>
>  
>  enum state_t {
>  	LIT,				/* Literal input */
> @@ -202,7 +203,7 @@ static void printchar(struct fbc_priv *priv, int c)
>  
>  		buf = gui_screen_render_buffer(priv->sc);
>  
> -		memcpy(buf, buf + line_height, line_height * priv->rows);
> +		__iowrite64_copy(buf, buf + line_height, (line_height * priv->rows) >> 2);

Shouldn't this be >> 3?

Besides, I'm not sure using __iowrite64_copy is the right weapon here.
Maybe better port arch/x86/lib/memcpy_64.S to get an optimized memcpy?

Sascha


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