On Thursday, March 9, 2017 8:30:44 PM PST Jason Ekstrand wrote:
> On Thu, Mar 9, 2017 at 8:18 PM, Kenneth Graunke <kenn...@whitecape.org>
> wrote:
>
> > On Thursday, March 9, 2017 3:35:15 PM PST Nanley Chery wrote:
> > > The PRMs state that this packet is 16 DWORDS long. Ensure that the last
> > > three DWORDS are zeroed as required by the hardware when allocating a
> > > null surface state.
> > >
> > > Cc: <mesa-sta...@lists.freedesktop.org>
> > > Signed-off-by: Nanley Chery <nanley.g.ch...@intel.com>
> > > ---
> > > src/intel/isl/isl.c | 2 +-
> > > src/mesa/drivers/dri/i965/gen8_surface_state.c | 5 ++---
> > > 2 files changed, 3 insertions(+), 4 deletions(-)
> > >
> > > diff --git a/src/intel/isl/isl.c b/src/intel/isl/isl.c
> > > index 6eb1e93efd..b4bdf2059a 100644
> > > --- a/src/intel/isl/isl.c
> > > +++ b/src/intel/isl/isl.c
> > > @@ -56,7 +56,7 @@ static const struct {
> > > [5] = {24, 32, 4},
> > > [6] = {24, 32, 4},
> > > [7] = {32, 32, 4, 24},
> > > - [8] = {52, 64, 32, 40},
> > > + [8] = {64, 64, 32, 40},
> > > [9] = {64, 64, 32, 40},
> > > };
> > >
> > > diff --git a/src/mesa/drivers/dri/i965/gen8_surface_state.c
> > b/src/mesa/drivers/dri/i965/gen8_surface_state.c
> > > index 501531d4ad..f868293217 100644
> > > --- a/src/mesa/drivers/dri/i965/gen8_surface_state.c
> > > +++ b/src/mesa/drivers/dri/i965/gen8_surface_state.c
> > > @@ -46,10 +46,9 @@ static uint32_t *
> > > gen8_allocate_surface_state(struct brw_context *brw,
> > > uint32_t *out_offset, int index)
> > > {
> > > - int dwords = brw->gen >= 9 ? 16 : 13;
> > > uint32_t *surf = __brw_state_batch(brw, AUB_TRACE_SURFACE_STATE,
> > > - dwords * 4, 64, index,
> > out_offset);
> > > - memset(surf, 0, dwords * 4);
> > > + 64, 64, index, out_offset);
> > > + memset(surf, 0, 64);
> > > return surf;
> > > }
> > >
> > >
> >
> > Does this actually fix anything, or just use more batch space?
> >
>
> If you allocate more than one, it won't use any more batch space due to
> alignments.
> Good point. Never mind the objection then. --Ken
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