Changeset 61597 in vbox for trunk/src/VBox/Additions/linux/drm

Timestamp:

Jun 9, 2016 6:24:00 AM (9 years ago)

Author:

vboxsync

Message:

bugref:4567: Linux kernel driver maintenance
drm/vboxvideo: Add delayed update to support fbdev

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@…>
Signed-off-by: Egbert Eich <eich@…>

File:

• trunk/src/VBox/Additions/linux/drm/vbox_fb.c (modified) (3 diffs)

trunk/src/VBox/Additions/linux/drm/vbox_fb.c

@@ -69 +69 @@
 #include "vbox_drv.h"
 
+#define VBOX_DIRTY_DELAY (HZ / 30)
 /**
  * Tell the host about dirty rectangles to update.
@@ -161 +162 @@
     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,
@@ -324 +357 @@
     info->screen_size = size;
 
+    info->fbdefio = &vbox_defio;
+    fb_deferred_io_init(info);
+
     info->pixmap.flags = FB_PIXMAP_SYSTEM;