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File drm-vboxvideo-Add-delayed-update-to-support-fbdev.patch of Package virtualbox-5.0

From: Egbert Eich <eich@suse.de>
Date: Mon Apr 25 16:47:41 2016 +0200
Subject: drm/vboxvideo: Add delayed update to support fbdev
Patch-mainline: Not yet
Git-commit: 0671f61d2a240e26c02d5a4d5cb993e1a446e601
References: boo#977200

Due to the virtrual nature of the emulated hardware, the
hardware needs help to know about updates to screen content.
The fb layer provides this with 'deferred IO'.
This patch adds support for this to the vboxvideo DRM driver.

Signed-off-by: Egbert Eich <eich@suse.de>
Signed-off-by: Egbert Eich <eich@suse.com>
---
 src/VBox/Additions/linux/drm/vbox_fb.c | 36 ++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
diff --git a/src/VBox/Additions/linux/drm/vbox_fb.c b/src/VBox/Additions/linux/drm/vbox_fb.c
index 8e0e40d..e8c5a60 100644
--- a/src/VBox/Additions/linux/drm/vbox_fb.c
+++ b/src/VBox/Additions/linux/drm/vbox_fb.c
@@ -68,6 +68,7 @@
 #include <drm/drm_crtc_helper.h>
 #include "vbox_drv.h"
 
+#define VBOX_DIRTY_DELAY (HZ / 30)
 /**
  * Tell the host about dirty rectangles to update.
  */
@@ -162,6 +163,38 @@ static void vbox_dirty_update(struct vbox_fbdev *fbdev,
     vbox_bo_unreserve(bo);
 }
 
+static void vbox_deferred_io(struct fb_info *info,
+                             struct list_head *pagelist)
+{
+        struct vbox_fbdev *fbdev = info->par;
+        unsigned long start, end, min, max;
+        struct page *page;
+        int y1, y2;
+
+        min = ULONG_MAX;
+        max = 0;
+        list_for_each_entry(page, pagelist, lru) {
+                start = page->index << PAGE_SHIFT;
+                end = start + PAGE_SIZE - 1;
+                min = min(min, start);
+                max = max(max, end);
+        }
+
+        if (min < max) {
+                y1 = min / info->fix.line_length;
+                y2 = (max / info->fix.line_length) + 1;
+                printk(KERN_INFO "%s: Calling dirty update: 0, %d, %d, %d\n",
+                       __func__, y1, info->var.xres, y2 - y1 - 1);
+                vbox_dirty_update(fbdev, 0, y1, info->var.xres, y2 - y1 - 1);
+        }
+}
+
+static struct fb_deferred_io vbox_defio =
+{
+        .delay          = VBOX_DIRTY_DELAY,
+        .deferred_io    = vbox_deferred_io,
+};
+
 static void vbox_fillrect(struct fb_info *info,
              const struct fb_fillrect *rect)
 {
@@ -324,6 +357,9 @@ static int vboxfb_create(struct drm_fb_helper *helper,
     info->screen_base = sysram;
     info->screen_size = size;
 
+    info->fbdefio = &vbox_defio;
+    fb_deferred_io_init(info);
+
     info->pixmap.flags = FB_PIXMAP_SYSTEM;
 
     DRM_DEBUG_KMS("allocated %dx%d\n",