On Tue, Sep 09, 2014 at 12:57:11PM +0100, Chris Wilson wrote: > On Fri, Sep 05, 2014 at 02:13:16PM +0100, Michel Thierry wrote: > > Use full PPGTT as the default option in gen7. > > Note that aliasing PPGTT is the default option for gen8 (see HAS_PPGTT). > > > > This may well come back to bite me later. > > Indeed. So something I spotted was that bspec mentions that the per-ring > PDE registers (RING_PP_DIR_DCLV and RING_PP_DIR_BASE) are stored in the > logical context and so the registers are restored along with the > context. If this is correct what happens when we switch logical contexts > on RCS whilst we have active work on BCS etc? Does this mean that we > have to serialise context switches across rings, or is my reading of the > bspec false? How does rcs PP_DIR_* affect bcs? Also IIRC that stuff is part of the execlist context which isn't saved/restored unless execlists are actually enabled. IIRC when I tried it, snb did reserve the space for that stuff in the context image but didn't save/restore it, but ivb+ didn't even reserve the space. -- Ville Syrjälä Intel OTC _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
