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

[Daniel Vetter]

On Thu, Sep 5, 2019 at 9:01 AM Gerd Hoffmann <kraxel at redhat.com> wrote:
>
>   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.

Yeah that should be a really clean solution, and only needs changes in
the vram helpers. Which is nice, more common code!
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch