multiseat

[Benjamin Herrenschmidt]

> Ben's plan is to group the video cards into two categories, good and
> bad. Bad cards need VGA at run time, good cards do not.  You can have
> one bad card and as many good ones as you want. Posting is
> sequentialized so that each card can use the VGA ports.
> 
> On super fancy machines you can have one bad card per bus since the
> bridges can be used to isolate them.  You'll probably still have to
> access them sequentially because of the A000 memory hole.

Oh, it's not really a 2 categories thing. It's just that for each card,
i track wether they actually decode legacy IO and/or legacy MEM (and
separately). By default I assume they assume they all do both, but then,
the driver can instruct the arbiter to disable that behaviour.

Ben.