drm/vmwgfx: Assign eviction priorities to resources

TTM provides a means to assign eviction priorities to buffer object. This
means that all buffer objects with a lower priority will be evicted first
on memory pressure.
Use this to make sure surfaces and in particular non-dirty surfaces are
evicted first. Evicting in particular shaders, cotables and contexts imply
a significant performance hit on vmwgfx, so make sure these resources are
evicted last.
Some buffer objects are sub-allocated in user-space which means we can have
many resources attached to a single buffer object or resource. In that case
the buffer object is given the highest priority of the attached resources.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Deepak Rawat <drawat@vmware.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>

drivers/gpu/drm/vmwgfx/vmwgfx_resource_priv.h

@@ -78,6 +78,8 @@ struct vmw_res_func {
 	const char *type_name;
 	struct ttm_placement *backup_placement;
 	bool may_evict;
+	u32 prio;
+	u32 dirty_prio;
 
 	int (*create) (struct vmw_resource *res);
 	int (*destroy) (struct vmw_resource *res);