On Thu, Oct 23, 2014 at 02:21:02PM +0200, Daniel Vetter wrote: > On Wed, Oct 22, 2014 at 06:59:52PM +0100, Arun Siluvery wrote: > > The number of DWords should be even when doing ring emits as > > command sequences require QWord alignment. > > > > v2: user LRI variant that can write multiple regs in one go (Damien). > > We can simply insert one NOP at the end instead of one per register write. > > > > Cc: Mika Kuoppala <mika.kuopp...@intel.com> > > Signed-off-by: Arun Siluvery <arun.siluv...@linux.intel.com> > > --- > > drivers/gpu/drm/i915/intel_ringbuffer.c | 5 +++-- > > 1 file changed, 3 insertions(+), 2 deletions(-) > > > > diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c > > b/drivers/gpu/drm/i915/intel_ringbuffer.c > > index 497b836..a8f72e8 100644 > > --- a/drivers/gpu/drm/i915/intel_ringbuffer.c > > +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c > > @@ -680,15 +680,16 @@ static int intel_ring_workarounds_emit(struct > > intel_engine_cs *ring) > > if (ret) > > return ret; > > > > - ret = intel_ring_begin(ring, w->count * 3); > > + ret = intel_ring_begin(ring, (w->count * 2 + 2)); > > if (ret) > > return ret; > > > > + intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(w->count)); > > Afaik there's a limit to the size of an MI_LRI. Where's the check for > that (probably with a WARN_ON for now to avoid unecessary complexity)?
I guess there's always the size of the length field, I don't see any other indication. Note that I can find the documentation of the multi-registers version of LRI either. So, well, we probably should double check it does work. -- Damien _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx
