On Tue, Sep 9, 2014 at 1:34 PM, Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> wrote: > 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. > Yes, my understanding is that these registers are per engine, and bcs couldn't be affected by rcs. -Michel
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