drm/vmwgfx: Implement basic pm operations.

Currently we really only support S3, since the device doesn't support
saving of the 3D state.

On S3/S4, move all buffer objects to swappable memory and take down
GMR bindings. We need to do that from a PM notifier since we can't
do persistant memory allocations from the standard PM callbacks.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
index 4c9d6b2..7532b9b 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
@@ -32,6 +32,7 @@
 #include "drmP.h"
 #include "vmwgfx_drm.h"
 #include "drm_hashtab.h"
+#include "linux/suspend.h"
 #include "ttm/ttm_bo_driver.h"
 #include "ttm/ttm_object.h"
 #include "ttm/ttm_lock.h"
@@ -258,6 +259,7 @@
 
 	struct vmw_master *active_master;
 	struct vmw_master fbdev_master;
+	struct notifier_block pm_nb;
 };
 
 static inline struct vmw_private *vmw_priv(struct drm_device *dev)