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

On Thu, Sep 5, 2019 at 9:01 AM Gerd Hoffmann kraxel@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