Re: [PATCH v2 5/9] vgacon: remove screen_info dependency

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Hi Arnd,

On 19/7/23 14:39, Arnd Bergmann wrote:
From: Arnd Bergmann <arnd@xxxxxxxx>

The vga console driver is fairly self-contained, and only used by
architectures that explicitly initialize the screen_info settings.

Chance every instance that picks the vga console by setting conswitchp
to call a function instead, and pass a reference to the screen_info
there.

Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
---
  arch/alpha/kernel/setup.c      |  2 +-
  arch/arm/kernel/setup.c        |  2 +-
  arch/ia64/kernel/setup.c       |  2 +-
  arch/mips/kernel/setup.c       |  2 +-
  arch/x86/kernel/setup.c        |  2 +-
  drivers/firmware/pcdp.c        |  2 +-
  drivers/video/console/vgacon.c | 68 ++++++++++++++++++++--------------
  include/linux/console.h        |  7 ++++
  8 files changed, 53 insertions(+), 34 deletions(-)


@@ -1074,13 +1077,13 @@ static int vgacon_resize(struct vc_data *c, unsigned int width,
  		 * Ho ho!  Someone (svgatextmode, eh?) may have reprogrammed
  		 * the video mode!  Set the new defaults then and go away.
  		 */
-		screen_info.orig_video_cols = width;
-		screen_info.orig_video_lines = height;
+		vga_si->orig_video_cols = width;
+		vga_si->orig_video_lines = height;
  		vga_default_font_height = c->vc_cell_height;
  		return 0;
  	}
-	if (width % 2 || width > screen_info.orig_video_cols ||
-	    height > (screen_info.orig_video_lines * vga_default_font_height)/
+	if (width % 2 || width > vga_si->orig_video_cols ||
+	    height > (vga_si->orig_video_lines * vga_default_font_height)/
  	    c->vc_cell_height)
  		return -EINVAL;
@@ -1110,8 +1113,8 @@ static void vgacon_save_screen(struct vc_data *c)
  		 * console initialization routines.
  		 */
  		vga_bootup_console = 1;
-		c->state.x = screen_info.orig_x;
-		c->state.y = screen_info.orig_y;
+		c->state.x = vga_si->orig_x;
+		c->state.y = vga_si->orig_y;

Not really my area, so bare with me if this is obviously not
possible :) If using DUMMY_CONSOLE, can we trigger a save_screen
/ resize? If so, we'd reach here with vga_si=NULL.

  	}
/* We can't copy in more than the size of the video buffer,
@@ -1204,4 +1207,13 @@ const struct consw vga_con = {
  };
  EXPORT_SYMBOL(vga_con);
+void vgacon_register_screen(struct screen_info *si)
+{
+	if (!si || vga_si)
+		return;
+
+	conswitchp = &vga_con;
+	vga_si = si;
+}




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