dm: vdisplay: terminate acrn-dm process when SDL init failed

Virtual display is component which based on native window system.
This feature depended phisical monitor connected and graphic driver in
SOS running correctly. If these dependencies fail, it is a fatal error
for virtual display. We have to terminate the device model to let user
fix runtime environment issue for graphics.

Tracked-On: #7672
Signed-off-by: Sun Peng <peng.p.sun@linux.intel.com>

devicemodel/core/main.c

@@ -1045,7 +1045,10 @@ main(int argc, char *argv[])
 	}
 
 	if (gfx_ui) {
-		gfx_ui_init();
+		if(gfx_ui_init()) {
+			pr_err("gfx ui initialize failed\n");
+			exit(1);
+		}
 	}
 
 	for (;;) {

devicemodel/hw/vdisplay_sdl.c

@@ -1128,7 +1128,7 @@ vdpy_deinit(int handle)
 	return 0;
 }
 
-void
+int
 gfx_ui_init()
 {
 	SDL_SysWMinfo info;
@@ -1141,6 +1141,7 @@ gfx_ui_init()
 
 	if (SDL_Init(SDL_INIT_VIDEO)) {
 		pr_err("Failed to Init SDL2 system");
+		return -1;
 	}
 
 	SDL_GetDisplayBounds(0, &disp_rect);
@@ -1150,6 +1151,7 @@ gfx_ui_init()
 		pr_err("Too small resolutions. Please check the "
 		       " graphics system\n");
 		SDL_Quit();
+		return -1;
 	}
 
 	SDL_SetHint(SDL_HINT_GRAB_KEYBOARD, "1");
@@ -1170,6 +1172,8 @@ gfx_ui_init()
 	SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 8);
 
 	vdpy.s.is_ui_realized = true;
+
+	return 0;
 }
 
 void

devicemodel/include/vdisplay.h

@@ -84,7 +84,7 @@ struct cursor {
 };
 
 int vdpy_parse_cmd_option(const char *opts);
-void gfx_ui_init();
+int gfx_ui_init();
 int vdpy_init();
 void vdpy_get_display_info(int handle, struct display_info *info);
 void vdpy_surface_set(int handle, struct surface *surf);