On Wed, 10 Oct 2012 23:14:01 +0200, Daniel Vetter <daniel.vetter at ffwll.ch> wrote: > It doesn't work since the gtt pte range sits in the middle of the mmio > bar. We didn't notice that since both my and Chris' gen2 machines > don't support PAT and hence all wc io mapping request will > automatically be demoted to uc. > > This regression has been introduce in > > commit edef7e685da05c13cce50c0126189c80fe2c8f71 > Author: Chris Wilson <chris at chris-wilson.co.uk> > Date: Fri Sep 14 11:57:47 2012 +0100 > > agp/intel: Use a write-combining map for updating PTEs > > Reported-by: Egbert Eich <eich at pdx.freedesktop.org> > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=55834 > Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch> Thanks for the explanation, Acked-by: Chris Wilson <chris at chris-wilson.co.uk> -Chris -- Chris Wilson, Intel Open Source Technology Centre
