[Mesa-dev] [PATCH 2/2] i965: Set pitch of pull constant buffers to 16.

[Paul Berry]

We always access pull constant buffers using the message types "OWord
Block Read" or "OWord Dual Block Read".  According to the Sandy Bridge
PRM, Vol 4 Part 1, pages 214 and 218, when using these messages:

    "the surface pitch is ignored, the surface is treated as a
    1-dimensional surface.  An element size (pitch) of 16 bytes is
    used to determine the size of the buffer for out-of-bounds
    checking if using the surface state model."

Previously we were setting the pitch for pull constant buffers to the
size of the whole constant buffer--this made no sense and would have
led to incorrect behavior if it were not for the fact that the pitch
is ignored.

For clarity, this patch sets the pitch for pull constant buffers to 16
bytes, consistent with the hardware's behavior.

No piglit regressions on Sandy Bridge or Ivy Bridge.
---
 src/mesa/drivers/dri/i965/brw_wm_surface_state.c  |    2 +-
 src/mesa/drivers/dri/i965/gen7_wm_surface_state.c |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_wm_surface_state.c b/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
index b40f5e1..e474626 100644
--- a/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
+++ b/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
@@ -702,7 +702,7 @@ brw_create_constant_surface(struct brw_context *brw,
 	      ((w >> 7) & 0x1fff) << BRW_SURFACE_HEIGHT_SHIFT);
 
    surf[3] = (((w >> 20) & 0x7f) << BRW_SURFACE_DEPTH_SHIFT |
-	      (width * 16 - 1) << BRW_SURFACE_PITCH_SHIFT);
+	      15 << BRW_SURFACE_PITCH_SHIFT); /* ignored */
 
    surf[4] = 0;
    surf[5] = 0;
diff --git a/src/mesa/drivers/dri/i965/gen7_wm_surface_state.c b/src/mesa/drivers/dri/i965/gen7_wm_surface_state.c
index 1c0183b..b05c8ae 100644
--- a/src/mesa/drivers/dri/i965/gen7_wm_surface_state.c
+++ b/src/mesa/drivers/dri/i965/gen7_wm_surface_state.c
@@ -157,7 +157,7 @@ gen7_create_constant_surface(struct brw_context *brw,
    surf->ss2.width = w & 0x7f;            /* bits 6:0 of size or width */
    surf->ss2.height = (w >> 7) & 0x1fff;  /* bits 19:7 of size or width */
    surf->ss3.depth = (w >> 20) & 0x7f;    /* bits 26:20 of size or width */
-   surf->ss3.pitch = (width * 16) - 1; /* ignored?? */
+   surf->ss3.pitch = 15; /* ignored */
    gen7_set_surface_tiling(surf, I915_TILING_NONE); /* tiling now allowed */
 
    /* Emit relocation to surface contents.  Section 5.1.1 of the gen4
-- 
1.7.6.5