drm/vmwgfx: Add debug message for layout change ioctl

Add debug code to check user-space layout change request.

Signed-off-by: Deepak Rawat <[e-mail]>
Reviewed-by: Thomas Hellstrom <[e-mail]>
Signed-off-by: Thomas Hellstrom <[e-mail]>

drivers/gpu/drm/vmwgfx/vmwgfx_drv.h

···
 	DRM_DEBUG_DRIVER(fmt, ##__VA_ARGS__)
 
 /**
+ * VMW_DEBUG_KMS - Debug output for kernel mode-setting
+ *
+ * This macro is for debugging vmwgfx mode-setting code.
+ */
+#define VMW_DEBUG_KMS(fmt, ...)                                               \
+	DRM_DEBUG_DRIVER(fmt, ##__VA_ARGS__)
+
+/**
  * Inline helper functions
  */
 

drivers/gpu/drm/vmwgfx/vmwgfx_kms.c

···
 
 	if (!arg->num_outputs) {
 		struct drm_rect def_rect = {0, 0, 800, 600};
+		VMW_DEBUG_KMS("Default layout x1 = %d y1 = %d x2 = %d y2 = %d\n",
+			      def_rect.x1, def_rect.y1,
+			      def_rect.x2, def_rect.y2);
 		vmw_du_update_layout(dev_priv, 1, &def_rect);
 		return 0;
 	}
···
 
 	drm_rects = (struct drm_rect *)rects;
 
+	VMW_DEBUG_KMS("Layout count = %u\n", arg->num_outputs);
 	for (i = 0; i < arg->num_outputs; i++) {
 		struct drm_vmw_rect curr_rect;
 
···
 		drm_rects[i].y1 = curr_rect.y;
 		drm_rects[i].x2 = curr_rect.x + curr_rect.w;
 		drm_rects[i].y2 = curr_rect.y + curr_rect.h;
+
+		VMW_DEBUG_KMS("  x1 = %d y1 = %d x2 = %d y2 = %d\n",
+			      drm_rects[i].x1, drm_rects[i].y1,
+			      drm_rects[i].x2, drm_rects[i].y2);
 
 		/*
 		 * Currently this check is limiting the topology within