[PATCH v2 0/3] ast, mgag200: Map console BO while it's being displayed

[Gerd Hoffmann]

  Hi,

> - imo we should fix this by using the io_mapping stuff, that avoids
> the overhead of repeated pat checks for map/unmap.

Another idea:  IIRC ttm has a move_notify callback.  So we could simply
keep mappings active even when the refcount goes down to zero.  Then do
the actual unmap either in the move_notify or in the destroy callback.

cheers,
  Gerd