[Mesa-dev] [PATCH] anv: Fill holes in the VF VUE to zero

[Jason Ekstrand]

On Sat, Aug 25, 2018 at 5:56 PM Lionel Landwerlin <
lionel.g.landwerlin at intel.com> wrote:

> I don't know how you find this stuff...
>

Hours and hours of painfully reading through aub dumps looking for stuff
that's out of place and many experiments.  This hang has probably taken me
near enough to a week of debugging time all told.


> Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin at intel.com>
>

Thanks!

--Jason


> On 25/08/2018 23:17, Jason Ekstrand wrote:
> > Cc: mesa-stable at lists.freedesktop.org
> > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104809
> > ---
> >   src/intel/vulkan/genX_pipeline.c | 29 ++++++++++++++++++++++++++++-
> >   1 file changed, 28 insertions(+), 1 deletion(-)
> >
> > diff --git a/src/intel/vulkan/genX_pipeline.c
> b/src/intel/vulkan/genX_pipeline.c
> > index 022f324606e..b531205508c 100644
> > --- a/src/intel/vulkan/genX_pipeline.c
> > +++ b/src/intel/vulkan/genX_pipeline.c
> > @@ -115,7 +115,34 @@ emit_vertex_input(struct anv_pipeline *pipeline,
> >                          GENX(3DSTATE_VERTEX_ELEMENTS));
> >      if (!p)
> >         return;
> > -   memset(p + 1, 0, (num_dwords - 1) * 4);
> > +
> > +   for (uint32_t i = 0; i < total_elems; i++) {
> > +      /* The SKL docs for VERTEX_ELEMENT_STATE say:
> > +       *
> > +       *    "All elements must be valid from Element[0] to the last
> valid
> > +       *    element. (I.e. if Element[2] is valid then Element[1] and
> > +       *    Element[0] must also be valid)."
> > +       *
> > +       * The SKL docs for 3D_Vertex_Component_Control say:
> > +       *
> > +       *    "Don't store this component. (Not valid for Component 0,
> but can
> > +       *    be used for Component 1-3)."
> > +       *
> > +       * So we can't just leave a vertex element blank and hope for the
> best.
> > +       * We have to tell the VF hardware to put something in it; so we
> just
> > +       * store a bunch of zero.
> > +       *
> > +       * TODO: Compact vertex elements so we never end up with holes.
> > +       */
> > +      struct GENX(VERTEX_ELEMENT_STATE) element = {
> > +         .Valid = true,
> > +         .Component0Control = VFCOMP_STORE_0,
> > +         .Component1Control = VFCOMP_STORE_0,
> > +         .Component2Control = VFCOMP_STORE_0,
> > +         .Component3Control = VFCOMP_STORE_0,
> > +      };
> > +      GENX(VERTEX_ELEMENT_STATE_pack)(NULL, &p[1 + i * 2], &element);
> > +   }
> >
> >      for (uint32_t i = 0; i < info->vertexAttributeDescriptionCount;
> i++) {
> >         const VkVertexInputAttributeDescription *desc =
>
>
>
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