[Intel-gfx] [PATCH 9/9] drm/i915: swizzling support for snb/ivb

[Eric Anholt]

On Fri, 11 Nov 2011 21:18:31 +0100, Daniel Vetter <daniel at ffwll.ch> wrote:
> On Fri, Nov 11, 2011 at 20:58, Eric Anholt <eric at anholt.net> wrote:
> > Oh, yeah, swap.  Good point, sounds like a plan.  If you manage to get
> > reliable swapping of tiled data on 945g, I'll owe you all the beers.
> 
> If you mean i945G as in desktop variant, patch 6/9 should fix the
> swizzle detection on that one - it can do bit17 swizzling, too. I'd be
> interested in whether this fixes all the swap issues, if you have that
> machine still around ...
> 
> But as I've said there's also the gm45 bug which looks like a part of
> the main memory in not swizzled. On that topic: Do you still remember
> details about that machine where parts of the memory can be
> unswizzled?

The management engine/mismatched dimms issue making "L-shaped" memory
(part dual channel, part single channel) in the 945-gm45 era was never
handled (somewhere in g45-ilk era, there was a reg the BIOS could set
that would make L-shaped memory have consistent swizzling anyway).  I
never found precise docs on how to figure out what the shape of the L
was -- I suspect you'd get to find out by poking at things like TOLUD
and experimenting with binding all the pages you can grab to find which
are swizzled.

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