i965: Explicitly disable unused pipeline stages on Ivybridge.

This may not be strictly necessary, but seems wise.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>

src/mesa/drivers/dri/i965/Makefile

@@ -99,6 +99,7 @@ DRIVER_SOURCES = \
 	gen6_wm_state.c \
 	gen7_cc_state.c \
 	gen7_clip_state.c \
+	gen7_disable.c \
 	gen7_sf_state.c \
 	gen7_urb.c \
 	gen7_viewport_state.c \

src/mesa/drivers/dri/i965/brw_defines.h

@@ -930,6 +930,7 @@
 # define GEN6_GS_BINDING_TABLE_ENTRY_COUNT_SHIFT	18
 /* DW4 */
 # define GEN6_GS_URB_READ_LENGTH_SHIFT			11
+# define GEN7_GS_INCLUDE_VERTEX_HANDLES		        (1 << 10)
 # define GEN6_GS_URB_ENTRY_READ_OFFSET_SHIFT		4
 # define GEN6_GS_DISPATCH_START_GRF_SHIFT		0
 /* DW5 */
@@ -937,9 +938,14 @@
 # define GEN6_GS_STATISTICS_ENABLE			(1 << 10)
 # define GEN6_GS_SO_STATISTICS_ENABLE			(1 << 9)
 # define GEN6_GS_RENDERING_ENABLE			(1 << 8)
+# define GEN7_GS_ENABLE					(1 << 0)
 /* DW6 */
 # define GEN6_GS_ENABLE					(1 << 15)
 
+#define _3DSTATE_HS                             0x781B /* GEN7+ */
+#define _3DSTATE_TE                             0x781C /* GEN7+ */
+#define _3DSTATE_DS                             0x781D /* GEN7+ */
+
 #define _3DSTATE_CLIP				0x7812 /* GEN6+ */
 /* DW1 */
 # define GEN7_CLIP_WINDING_CW                           (0 << 20)
@@ -1148,6 +1154,9 @@
 # define GEN6_CONSTANT_BUFFER_1_ENABLE			(1 << 13)
 # define GEN6_CONSTANT_BUFFER_0_ENABLE			(1 << 12)
 
+#define _3DSTATE_CONSTANT_HS                  0x7819 /* GEN7+ */
+#define _3DSTATE_CONSTANT_DS                  0x781A /* GEN7+ */
+
 /* 3DSTATE_WM for Gen7 */
 /* DW1 */
 # define GEN7_WM_STATISTICS_ENABLE			(1 << 31)
@@ -1219,6 +1228,8 @@
 /* DW6: kernel 1 pointer */
 /* DW7: kernel 2 pointer */
 
+#define _3DSTATE_STREAMOUT                      0x781e /* GEN7+ */
+
 #define _3DSTATE_SAMPLE_MASK			0x7818 /* GEN6+ */
 
 #define _3DSTATE_DRAWING_RECTANGLE		0x7900

src/mesa/drivers/dri/i965/brw_state.h

@@ -116,11 +116,13 @@ extern const struct brw_tracked_state gen7_cc_state_pointer;
 extern const struct brw_tracked_state gen7_cc_viewport_state_pointer;
 extern const struct brw_tracked_state gen7_clip_state;
 extern const struct brw_tracked_state gen7_depth_stencil_state_pointer;
+extern const struct brw_tracked_state gen7_disable_stages;
 extern const struct brw_tracked_state gen7_ps_state;
 extern const struct brw_tracked_state gen7_sbe_state;
 extern const struct brw_tracked_state gen7_sf_clip_viewport;
 extern const struct brw_tracked_state gen7_sf_clip_viewport_state_pointer;
 extern const struct brw_tracked_state gen7_sf_state;
+extern const struct brw_tracked_state gen7_sol_state;
 extern const struct brw_tracked_state gen7_urb;
 extern const struct brw_tracked_state gen7_vs_state;
 extern const struct brw_tracked_state gen7_wm_constants;

src/mesa/drivers/dri/i965/brw_state_upload.c

@@ -210,8 +210,8 @@ const struct brw_tracked_state *gen7_atoms[] =
    &brw_wm_samplers,
    &gen6_sampler_state,
 
+   &gen7_disable_stages,
    &gen7_vs_state,
-   &gen6_gs_state,
    &gen7_clip_state,
    &gen7_sbe_state,
    &gen7_sf_state,

src/mesa/drivers/dri/i965/gen7_disable.c

@@ -0,0 +1,126 @@
+/*
+ * Copyright © 2011 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include "brw_context.h"
+#include "brw_state.h"
+#include "brw_defines.h"
+#include "intel_batchbuffer.h"
+
+static void
+disable_stages(struct brw_context *brw)
+{
+   struct intel_context *intel = &brw->intel;
+
+   assert(brw->gs.prog_bo == NULL);
+
+   /* Disable the Geometry Shader (GS) Unit */
+   BEGIN_BATCH(7);
+   OUT_BATCH(_3DSTATE_CONSTANT_GS << 16 | (7 - 2));
+   OUT_BATCH(0);
+   OUT_BATCH(0);
+   OUT_BATCH(0);
+   OUT_BATCH(0);
+   OUT_BATCH(0);
+   OUT_BATCH(0);
+   ADVANCE_BATCH();
+
+   BEGIN_BATCH(7);
+   OUT_BATCH(_3DSTATE_GS << 16 | (7 - 2));
+   OUT_BATCH(0); /* prog_bo */
+   OUT_BATCH((0 << GEN6_GS_SAMPLER_COUNT_SHIFT) |
+	     (0 << GEN6_GS_BINDING_TABLE_ENTRY_COUNT_SHIFT));
+   OUT_BATCH(0); /* scratch space base offset */
+   OUT_BATCH((1 << GEN6_GS_DISPATCH_START_GRF_SHIFT) |
+	     (0 << GEN6_GS_URB_READ_LENGTH_SHIFT) |
+	     GEN7_GS_INCLUDE_VERTEX_HANDLES |
+	     (0 << GEN6_GS_URB_ENTRY_READ_OFFSET_SHIFT));
+   OUT_BATCH((0 << GEN6_GS_MAX_THREADS_SHIFT) |
+	     GEN6_GS_STATISTICS_ENABLE);
+   OUT_BATCH(0);
+   ADVANCE_BATCH();
+
+   /* Disable the HS Unit */
+   BEGIN_BATCH(7);
+   OUT_BATCH(_3DSTATE_CONSTANT_HS << 16 | (7 - 2));
+   OUT_BATCH(0);
+   OUT_BATCH(0);
+   OUT_BATCH(0);
+   OUT_BATCH(0);
+   OUT_BATCH(0);
+   OUT_BATCH(0);
+   ADVANCE_BATCH();
+
+   BEGIN_BATCH(7);
+   OUT_BATCH(_3DSTATE_HS << 16 | (7 - 2));
+   OUT_BATCH(0);
+   OUT_BATCH(0);
+   OUT_BATCH(0);
+   OUT_BATCH(0);
+   OUT_BATCH(0);
+   OUT_BATCH(0);
+   ADVANCE_BATCH();
+
+   /* Disable the TE */
+   BEGIN_BATCH(4);
+   OUT_BATCH(_3DSTATE_TE << 16 | (4 - 2));
+   OUT_BATCH(0);
+   OUT_BATCH(0);
+   OUT_BATCH(0);
+   ADVANCE_BATCH();
+
+   /* Disable the DS Unit */
+   BEGIN_BATCH(7);
+   OUT_BATCH(_3DSTATE_CONSTANT_DS << 16 | (7 - 2));
+   OUT_BATCH(0);
+   OUT_BATCH(0);
+   OUT_BATCH(0);
+   OUT_BATCH(0);
+   OUT_BATCH(0);
+   OUT_BATCH(0);
+   ADVANCE_BATCH();
+
+   BEGIN_BATCH(6);
+   OUT_BATCH(_3DSTATE_DS << 16 | (6 - 2));
+   OUT_BATCH(0);
+   OUT_BATCH(0);
+   OUT_BATCH(0);
+   OUT_BATCH(0);
+   OUT_BATCH(0);
+   ADVANCE_BATCH();
+
+   /* Disable the SOL stage */
+   BEGIN_BATCH(3);
+   OUT_BATCH(_3DSTATE_STREAMOUT << 16 | (3 - 2));
+   OUT_BATCH(0);
+   OUT_BATCH(0);
+   ADVANCE_BATCH();
+}
+
+const struct brw_tracked_state gen7_disable_stages = {
+   .dirty = {
+      .mesa  = 0,
+      .brw   = BRW_NEW_BATCH,
+      .cache = 0,
+   },
+   .emit = disable_stages,
+};