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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