From a16dc04ad51c32e5c7d136e4dd6273d983385d3f Mon Sep 17 00:00:00 2001 From: Kenneth Graunke Date: Tue, 31 Oct 2017 00:56:24 -0700 Subject: [PATCH] i965: properly initialize brw->cs.base.stage to MESA_SHADER_COMPUTE This has a bit of a surprising effect: For the render pipeline, the upload_sampler_state_table atom emits 3DSTATE_BINDING_TABLE_POINTERS_XS. It tries to avoid this for compute: if (GEN_GEN >= 7 && stage_state->stage != MESA_SHADER_COMPUTE) { /* Emit a 3DSTATE_SAMPLER_STATE_POINTERS_XS packet. */ genX(emit_sampler_state_pointers_xs)(brw, stage_state); } ... However, we were failing to initialize brw->cs.base.stage, so it was left as 0 (MESA_SHADER_VERTEX), causing this condition to break. We then emitted 3DSTATE_SAMPLER_STATE_POINTERS_VS in GPGPU mode, when trying to upload CS samplers. Nothing good can come of this. Found by inspection while debugging a GPU hang. Jordan believes this helps the Deus Ex: Mankind Divided benchmark mode's stability when running with shader cache. Cc: mesa-stable@lists.freedesktop.org Reviewed-by: Jason Ekstrand Reviewed-by: Jordan Justen --- src/mesa/drivers/dri/i965/brw_context.c | 1 + 1 file changed, 1 insertion(+) diff --git a/src/mesa/drivers/dri/i965/brw_context.c b/src/mesa/drivers/dri/i965/brw_context.c index 879daae..0ebd432 100644 --- a/src/mesa/drivers/dri/i965/brw_context.c +++ b/src/mesa/drivers/dri/i965/brw_context.c @@ -899,6 +899,7 @@ brwCreateContext(gl_api api, brw->tes.base.stage = MESA_SHADER_TESS_EVAL; brw->gs.base.stage = MESA_SHADER_GEOMETRY; brw->wm.base.stage = MESA_SHADER_FRAGMENT; + brw->cs.base.stage = MESA_SHADER_COMPUTE; if (devinfo->gen >= 8) { brw->vtbl.emit_depth_stencil_hiz = gen8_emit_depth_stencil_hiz; } else if (devinfo->gen >= 7) { -- 2.7.4