i965: Set Broadwell MOCS values everywhere it's possible.

This patch introduces two pre-canned MOCS values: BDW_MOCS_WB
(write-back, all caches) and BDW_MOCS_WT (write-through, all caches).

We use write-through caching for render targets, and write-back for
all other data.  (At least on Haswell, I believe write-back LLC/eLLC
didn't work for scan-out buffers, while write-through did.)

No performance analysis has been done on the impact of this patch.

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

6 files changed, 27 insertions, 12 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_defines.h b/src/mesa/drivers/dri/i965/brw_defines.h
index 8a4879b..c38e447 100644
--- a/src/mesa/drivers/dri/i965/brw_defines.h
+++ b/src/mesa/drivers/dri/i965/brw_defines.h
@@ -521,6 +521,10 @@
 #define GEN7_SURFACE_ARYSPC_FULL	(0 << 10)
 #define GEN7_SURFACE_ARYSPC_LOD0	(1 << 10)
 
+/* Surface state DW0 */
+#define GEN8_SURFACE_MOCS_SHIFT         24
+#define GEN8_SURFACE_MOCS_MASK          INTEL_MASK(30, 24)
+
 /* Surface state DW2 */
 #define BRW_SURFACE_HEIGHT_SHIFT	19
 #define BRW_SURFACE_HEIGHT_MASK		INTEL_MASK(31, 19)
@@ -2193,6 +2197,10 @@ enum brw_wm_barycentric_interp_mode {
 #define HSW_MOCS_WB_LLC_WB_ELLC         (2 << 1)
 #define HSW_MOCS_UC_LLC_WB_ELLC         (3 << 1)
 
+/* Broadwell: write-back or write-through; always use all the caches. */
+#define BDW_MOCS_WB 0x78
+#define BDW_MOCS_WT 0x58
+
 #include "intel_chipset.h"
 
 #endif
diff --git a/src/mesa/drivers/dri/i965/gen8_depth_state.c b/src/mesa/drivers/dri/i965/gen8_depth_state.c
index 379a2c3..621951e 100644
--- a/src/mesa/drivers/dri/i965/gen8_depth_state.c
+++ b/src/mesa/drivers/dri/i965/gen8_depth_state.c
@@ -68,7 +68,7 @@ emit_depth_packets(struct brw_context *brw,
       OUT_BATCH(0);
    }
    OUT_BATCH(((width - 1) << 4) | ((height - 1) << 18) | lod);
-   OUT_BATCH(((depth - 1) << 21) | (min_array_element << 10));
+   OUT_BATCH(((depth - 1) << 21) | (min_array_element << 10) | BDW_MOCS_WB);
    OUT_BATCH(0);
    OUT_BATCH(depth_mt ? depth_mt->qpitch >> 2 : 0);
    ADVANCE_BATCH();
@@ -84,7 +84,7 @@ emit_depth_packets(struct brw_context *brw,
    } else {
       BEGIN_BATCH(5);
       OUT_BATCH(GEN7_3DSTATE_HIER_DEPTH_BUFFER << 16 | (5 - 2));
-      OUT_BATCH(depth_mt->hiz_mt->region->pitch - 1);
+      OUT_BATCH((depth_mt->hiz_mt->region->pitch - 1) | BDW_MOCS_WB << 25);
       OUT_RELOC64(depth_mt->hiz_mt->region->bo,
                   I915_GEM_DOMAIN_RENDER, I915_GEM_DOMAIN_RENDER, 0);
       OUT_BATCH(depth_mt->hiz_mt->qpitch >> 2);
@@ -116,7 +116,8 @@ emit_depth_packets(struct brw_context *brw,
        * page (which would imply that it does).  Experiments with the hardware
        * indicate that it does.
        */
-      OUT_BATCH(HSW_STENCIL_ENABLED | (2 * stencil_mt->region->pitch - 1));
+      OUT_BATCH(HSW_STENCIL_ENABLED | BDW_MOCS_WB << 22 |
+                (2 * stencil_mt->region->pitch - 1));
       OUT_RELOC64(stencil_mt->region->bo,
                   I915_GEM_DOMAIN_RENDER, I915_GEM_DOMAIN_RENDER,
                   stencil_offset);
diff --git a/src/mesa/drivers/dri/i965/gen8_draw_upload.c b/src/mesa/drivers/dri/i965/gen8_draw_upload.c
index f927c13..83bc240 100644
--- a/src/mesa/drivers/dri/i965/gen8_draw_upload.c
+++ b/src/mesa/drivers/dri/i965/gen8_draw_upload.c
@@ -105,6 +105,7 @@ gen8_emit_vertices(struct brw_context *brw)
          dw0 |= i << GEN6_VB0_INDEX_SHIFT;
          dw0 |= GEN7_VB0_ADDRESS_MODIFYENABLE;
          dw0 |= buffer->stride << BRW_VB0_PITCH_SHIFT;
+         dw0 |= BDW_MOCS_WB << 16;
 
          OUT_BATCH(dw0);
          OUT_RELOC64(buffer->bo, I915_GEM_DOMAIN_VERTEX, 0, buffer->offset);
diff --git a/src/mesa/drivers/dri/i965/gen8_misc_state.c b/src/mesa/drivers/dri/i965/gen8_misc_state.c
index 72ac2b2..4641388 100644
--- a/src/mesa/drivers/dri/i965/gen8_misc_state.c
+++ b/src/mesa/drivers/dri/i965/gen8_misc_state.c
@@ -37,18 +37,21 @@ static void upload_state_base_address(struct brw_context *brw)
    OUT_BATCH(CMD_STATE_BASE_ADDRESS << 16 | (16 - 2));
    /* General state base address: stateless DP read/write requests */
    OUT_BATCH(0);
-   OUT_BATCH(1);
-   OUT_BATCH(0);
+   OUT_BATCH(BDW_MOCS_WB << 2 | 1);
+   OUT_BATCH(BDW_MOCS_WB << 16);
    /* Surface state base address: */
-   OUT_RELOC64(brw->batch.bo, I915_GEM_DOMAIN_SAMPLER, 0, 1);
+   OUT_RELOC64(brw->batch.bo, I915_GEM_DOMAIN_SAMPLER, 0,
+               BDW_MOCS_WB << 4 | 1);
    /* Dynamic state base address: */
    OUT_RELOC64(brw->batch.bo,
-               I915_GEM_DOMAIN_RENDER | I915_GEM_DOMAIN_INSTRUCTION, 0, 1);
+               I915_GEM_DOMAIN_RENDER | I915_GEM_DOMAIN_INSTRUCTION, 0,
+               BDW_MOCS_WB << 4 | 1);
    /* Indirect object base address: MEDIA_OBJECT data */
    OUT_BATCH(0);
-   OUT_BATCH(1);
+   OUT_BATCH(BDW_MOCS_WB << 4 | 1);
    /* Instruction base address: shader kernels (incl. SIP) */
-   OUT_RELOC64(brw->cache.bo, I915_GEM_DOMAIN_INSTRUCTION, 0, 1);
+   OUT_RELOC64(brw->cache.bo, I915_GEM_DOMAIN_INSTRUCTION, 0,
+               BDW_MOCS_WB << 4 | 1);
 
    /* General state buffer size */
    OUT_BATCH(0xfffff001);
diff --git a/src/mesa/drivers/dri/i965/gen8_sol_state.c b/src/mesa/drivers/dri/i965/gen8_sol_state.c
index 35a77ac..35aa766 100644
--- a/src/mesa/drivers/dri/i965/gen8_sol_state.c
+++ b/src/mesa/drivers/dri/i965/gen8_sol_state.c
@@ -79,7 +79,8 @@ gen8_upload_3dstate_so_buffers(struct brw_context *brw)
       OUT_BATCH(_3DSTATE_SO_BUFFER << 16 | (8 - 2));
       OUT_BATCH(GEN8_SO_BUFFER_ENABLE | (i << SO_BUFFER_INDEX_SHIFT) |
                 GEN8_SO_BUFFER_OFFSET_WRITE_ENABLE |
-                GEN8_SO_BUFFER_OFFSET_ADDRESS_ENABLE);
+                GEN8_SO_BUFFER_OFFSET_ADDRESS_ENABLE |
+                (BDW_MOCS_WB << 22));
       OUT_RELOC64(bo, I915_GEM_DOMAIN_RENDER, I915_GEM_DOMAIN_RENDER, start);
       OUT_BATCH(xfb_obj->Size[i] / 4 - 1);
       OUT_RELOC64(brw_obj->offset_bo,
diff --git a/src/mesa/drivers/dri/i965/gen8_surface_state.c b/src/mesa/drivers/dri/i965/gen8_surface_state.c
index 27af6ad..90ec21a 100644
--- a/src/mesa/drivers/dri/i965/gen8_surface_state.c
+++ b/src/mesa/drivers/dri/i965/gen8_surface_state.c
@@ -101,6 +101,7 @@ gen8_emit_buffer_surface_state(struct brw_context *brw,
    surf[0] = BRW_SURFACE_BUFFER << BRW_SURFACE_TYPE_SHIFT |
              surface_format << BRW_SURFACE_FORMAT_SHIFT |
              BRW_SURFACE_RC_READ_WRITE;
+   surf[1] = SET_FIELD(mocs, GEN8_SURFACE_MOCS);
 
    surf[2] = SET_FIELD((buffer_size - 1) & 0x7f, GEN7_SURFACE_WIDTH) |
              SET_FIELD(((buffer_size - 1) >> 7) & 0x3fff, GEN7_SURFACE_HEIGHT);
@@ -172,7 +173,7 @@ gen8_update_texture_surface(struct gl_context *ctx,
    if (mt->logical_depth0 > 1 && tObj->Target != GL_TEXTURE_3D)
       surf[0] |= GEN8_SURFACE_IS_ARRAY;
 
-   surf[1] = mt->qpitch >> 2;
+   surf[1] = SET_FIELD(BDW_MOCS_WB, GEN8_SURFACE_MOCS) | mt->qpitch >> 2;
 
    surf[2] = SET_FIELD(mt->logical_width0 - 1, GEN7_SURFACE_WIDTH) |
              SET_FIELD(mt->logical_height0 - 1, GEN7_SURFACE_HEIGHT);
@@ -313,7 +314,7 @@ gen8_update_renderbuffer_surface(struct brw_context *brw,
              horizontal_alignment(mt) |
              surface_tiling_mode(region->tiling);
 
-   surf[1] = mt->qpitch >> 2;
+   surf[1] = SET_FIELD(BDW_MOCS_WT, GEN8_SURFACE_MOCS) | mt->qpitch >> 2;
 
    surf[2] = SET_FIELD(mt->logical_width0 - 1, GEN7_SURFACE_WIDTH) |
              SET_FIELD(mt->logical_height0 - 1, GEN7_SURFACE_HEIGHT);