[Mesa-stable] [PATCH 2/2] i965/mt: Disable HiZ when sharing depth buffer externally

[Chad Versace]

intel_miptree_make_shareable() discarded and disabled CCS. Fix it so
that it discards and disables HiZ too.

Fixes dEQP-EGL.functional.image.render_multiple_contexts.gles2_renderbuffer_depth16_depth_buffer
on Skylake.

Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=98329
Cc: Haixia Shi <hshi at chromium.org>
Cc: Topi Pohjolainen <topi.pohjolainen at intel.com>
Cc: Nanley Chery <nanley.g.chery at intel.com
Cc: mesa-stable at lists.freedesktop.org
---
 src/mesa/drivers/dri/i965/intel_mipmap_tree.c | 23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/intel_mipmap_tree.c b/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
index 15404dae32..06ff3a25d0 100644
--- a/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
+++ b/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
@@ -945,6 +945,19 @@ intel_miptree_reference(struct intel_mipmap_tree **dst,
    *dst = src;
 }
 
+static void
+intel_miptree_hiz_buffer_free(struct intel_miptree_hiz_buffer *hiz_buf)
+{
+   if (hiz_buf == NULL)
+      return;
+
+   if (hiz_buf->mt)
+      intel_miptree_release(&hiz_buf->mt);
+   else
+      drm_intel_bo_unreference(hiz_buf->aux_base.bo);
+
+   free(hiz_buf);
+}
 
 void
 intel_miptree_release(struct intel_mipmap_tree **mt)
@@ -961,13 +974,7 @@ intel_miptree_release(struct intel_mipmap_tree **mt)
       drm_intel_bo_unreference((*mt)->bo);
       intel_miptree_release(&(*mt)->stencil_mt);
       intel_miptree_release(&(*mt)->r8stencil_mt);
-      if ((*mt)->hiz_buf) {
-         if ((*mt)->hiz_buf->mt)
-            intel_miptree_release(&(*mt)->hiz_buf->mt);
-         else
-            drm_intel_bo_unreference((*mt)->hiz_buf->aux_base.bo);
-         free((*mt)->hiz_buf);
-      }
+      intel_miptree_hiz_buffer_free((*mt)->hiz_buf);
       if ((*mt)->mcs_buf) {
          drm_intel_bo_unreference((*mt)->mcs_buf->bo);
          free((*mt)->mcs_buf);
@@ -2311,6 +2318,8 @@ intel_miptree_all_slices_resolve_color(struct brw_context *brw,
  * Fast color clears are unsafe with shared buffers, so we need to resolve and
  * then discard the MCS buffer, if present.  We also set the no_ccs flag to
  * ensure that no MCS buffer gets allocated in the future.
+ *
+ * HiZ is similarly unsafe with shared buffers.
  */
 void
 intel_miptree_make_shareable(struct brw_context *brw,
-- 
2.11.0.rc2