[Mesa-dev] [PATCH] nvc0/ir: clamp the UBO index for compute on Kepler

[Ilia Mirkin]

On Fri, Jun 3, 2016 at 7:28 AM, Samuel Pitoiset
<samuel.pitoiset at gmail.com> wrote:
> We already check that the address is not "too far", but we should also
> clamp the UBO index in order to avoid looking at the wrong place in the
> driver cb. This is a pretty rare situation though.
>
> Signed-off-by: Samuel Pitoiset <samuel.pitoiset at gmail.com>
> Cc: "12.0" <mesa-stable at lists.freedesktop.org>
> ---
>  src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nvc0.cpp | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nvc0.cpp b/src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nvc0.cpp
> index 689fecf..e766aa7 100644
> --- a/src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nvc0.cpp
> +++ b/src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nvc0.cpp
> @@ -2181,7 +2181,12 @@ NVC0LoweringPass::handleLDST(Instruction *i)
>           int8_t fileIndex = i->getSrc(0)->reg.fileIndex - 1;
>           Value *ind = i->getIndirect(0, 1);
>
> -         // TODO: clamp the offset to the maximum number of const buf.
> +         if (ind) {
> +            // Clamp the UBO index when an indirect access is used to avoid
> +            // loading information from the wrong place in the driver cb.
> +            ind = bld.mkOp2v(OP_MIN, TYPE_U32, ind, ind, bld.loadImm(NULL, 12));

This doesn't take the file index into account.

> +         }
> +
>           if (i->src(0).isIndirect(1)) {
>              Value *offset = bld.loadImm(NULL, i->getSrc(0)->reg.data.offset + typeSizeof(i->sType));
>              Value *ptr = loadUboInfo64(ind, fileIndex * 16);
> --
> 2.8.3
>
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