From f468911feec94201b4296e3fe7480ebaf278fc4d Mon Sep 17 00:00:00 2001
From: Thomas Hellstrom <thellstrom@vmware.com>
Date: Wed, 21 Nov 2012 11:29:13 +0100
Subject: [PATCH] drm/vmwgfx: Detach backing store from its resources when it
 is evicted

When the backing store buffer is evicted, Issue a readback from the
resources and notify the resources that they are no longer bound to
a valid backing store.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Zack Rusin <zackr@vmware.com>
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