Mesa (master): Revert "i965/gen9: Plugin the code for selecting YF/ YS tiling on skl+"

[Anuj Phogat]

Module: Mesa
Branch: master
Commit: 545dec5b3efeab7691ab3eb1436747048f241cf9
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=545dec5b3efeab7691ab3eb1436747048f241cf9

Author: Anuj Phogat <anuj.phogat at gmail.com>
Date:   Fri Jul 17 14:14:29 2015 -0700

Revert "i965/gen9: Plugin the code for selecting YF/YS tiling on skl+"

Commit c9dbdc0 introduced some dead code which is supposed to be used
once we have Yf/Ys tiling working and performing better. Ken reported
the issue that static analysis tool now shows warnings due to the dead
code. To fix these warnings, this patch reverts the changes made in
commit c9dbdc0.

It'll be better to add the Yf/Ys tiling selection code later, when we
are ready to use it.

Signed-off-by: Anuj Phogat <anuj.phogat at gmail.com>
Acked-by: Kenneth Graunke <kenneth at whitecape.org>

---

 src/mesa/drivers/dri/i965/brw_tex_layout.c |  109 +++++-----------------------
 1 file changed, 17 insertions(+), 92 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_tex_layout.c b/src/mesa/drivers/dri/i965/brw_tex_layout.c
index a12b4af..85c0864 100644
--- a/src/mesa/drivers/dri/i965/brw_tex_layout.c
+++ b/src/mesa/drivers/dri/i965/brw_tex_layout.c
@@ -807,107 +807,32 @@ intel_miptree_set_alignment(struct brw_context *brw,
    }
 }
 
-static void
-intel_miptree_release_levels(struct intel_mipmap_tree *mt)
-{
-   unsigned int level = 0;
-
-   for (level = mt->first_level; level <= mt->last_level; level++) {
-      free(mt->level[level].slice);
-      mt->level[level].slice = NULL;
-   }
-}
-
-static bool
-intel_miptree_can_use_tr_mode(const struct intel_mipmap_tree *mt)
-{
-   if (mt->tiling == I915_TILING_Y ||
-       mt->tiling == (I915_TILING_Y | I915_TILING_X) ||
-       mt->tr_mode == INTEL_MIPTREE_TRMODE_NONE) {
-      /* FIXME: Don't allow YS tiling at the moment. Using 64KB tiling
-       * for small textures might result in to memory wastage. Revisit
-       * this condition when we have more information about the specific
-       * cases where using YS over YF will be useful.
-       */
-      if (mt->tr_mode != INTEL_MIPTREE_TRMODE_YS)
-         return true;
-   }
-   return false;
-}
-
 void
 brw_miptree_layout(struct brw_context *brw,
                    struct intel_mipmap_tree *mt,
                    uint32_t layout_flags)
 {
-   const unsigned bpp = mt->cpp * 8;
-   /* Enable YF/YS tiling only for color surfaces because depth and
-    * stencil surfaces are not supported in blitter using fast copy
-    * blit and meta PBO upload, download paths. No other paths
-    * currently support Yf/Ys tiled surfaces.
-    * FINISHME:  Remove this restriction once we have a tiled_memcpy()
-    * path to do depth/stencil data upload/download to Yf/Ys tiled
-    * surfaces.
-    */
-   const bool is_tr_mode_yf_ys_allowed =
-      brw->gen >= 9 &&
-      !(layout_flags & MIPTREE_LAYOUT_FOR_BO) &&
-      !mt->compressed &&
-      _mesa_is_format_color_format(mt->format) &&
-      (layout_flags & MIPTREE_LAYOUT_ALLOC_YTILED) &&
-      (bpp && is_power_of_two(bpp)) &&
-      /* FIXME: To avoid piglit regressions keep the Yf/Ys tiling
-       * disabled at the moment.
-       */
-      false;
+   mt->tr_mode = INTEL_MIPTREE_TRMODE_NONE;
 
-   /* Lower index (Yf) is the higher priority mode */
-   const uint32_t tr_mode[3] = {INTEL_MIPTREE_TRMODE_YF,
-                                INTEL_MIPTREE_TRMODE_YS,
-                                INTEL_MIPTREE_TRMODE_NONE};
-   int i = is_tr_mode_yf_ys_allowed ? 0 : ARRAY_SIZE(tr_mode) - 1;
-
-   while (i < ARRAY_SIZE(tr_mode)) {
-      if (brw->gen < 9)
-         assert(tr_mode[i] == INTEL_MIPTREE_TRMODE_NONE);
-      else
-         assert(tr_mode[i] == INTEL_MIPTREE_TRMODE_YF ||
-                tr_mode[i] == INTEL_MIPTREE_TRMODE_YS ||
-                tr_mode[i] == INTEL_MIPTREE_TRMODE_NONE);
+   intel_miptree_set_alignment(brw, mt, layout_flags);
+   intel_miptree_set_total_width_height(brw, mt);
 
-      mt->tr_mode = tr_mode[i];
-      intel_miptree_set_alignment(brw, mt, layout_flags);
-      intel_miptree_set_total_width_height(brw, mt);
-
-      if (!mt->total_width || !mt->total_height) {
-         intel_miptree_release(&mt);
-         break;
-      }
-
-      /* On Gen9+ the alignment values are expressed in multiples of the
-       * block size.
-       */
-      if (brw->gen >= 9) {
-         unsigned int i, j;
-         _mesa_get_format_block_size(mt->format, &i, &j);
-         mt->align_w /= i;
-         mt->align_h /= j;
-      }
+   if (!mt->total_width || !mt->total_height) {
+      intel_miptree_release(&mt);
+      return;
+   }
 
-      /* If there is already a BO, we cannot effect tiling modes */
-      if (layout_flags & MIPTREE_LAYOUT_FOR_BO)
-         break;
+   /* On Gen9+ the alignment values are expressed in multiples of the block
+    * size
+    */
+   if (brw->gen >= 9) {
+      unsigned int i, j;
+      _mesa_get_format_block_size(mt->format, &i, &j);
+      mt->align_w /= i;
+      mt->align_h /= j;
+   }
 
+   if ((layout_flags & MIPTREE_LAYOUT_FOR_BO) == 0)
       mt->tiling = brw_miptree_choose_tiling(brw, mt, layout_flags);
-      if (is_tr_mode_yf_ys_allowed) {
-         if (intel_miptree_can_use_tr_mode(mt))
-            break;
-         /* Failed to use selected tr_mode. Free up the memory allocated
-          * for miptree levels in intel_miptree_total_width_height().
-          */
-         intel_miptree_release_levels(mt);
-      }
-      i++;
-   }
 }