v3d: Emit a TF flush after each draw using TF.

This fixes GPU hangs on 7278 in transform feedback tests such as
GTF-GLES3.gtf.GL3Tests.transform_feedback2.transform_feedback2_basic

diff --git a/src/broadcom/cle/v3d_packet_v33.xml b/src/broadcom/cle/v3d_packet_v33.xml
index ff5ecb5c171600d38e5fb7cd1c9bec748f43d8df..3e85b6723203079aec5d765c3317048e61b6384d 100644 (file)
--- a/src/broadcom/cle/v3d_packet_v33.xml
+++ b/src/broadcom/cle/v3d_packet_v33.xml
@@ -425,6 +425,8 @@
     </field>
   </packet>
 
+  <packet code="31" name="Transform Feedback Flush and Count"/>
+
   <packet code="32" name="Indexed Primitive List" cl="B" max_ver="33">
     <field name="Minimum index" size="32" start="104" type="uint"/>
     <field name="Enable Primitive Restarts" size="1" start="103" type="bool"/>

diff --git a/src/gallium/drivers/v3d/v3dx_draw.c b/src/gallium/drivers/v3d/v3dx_draw.c
index 1e8b472a27dc06ccd09ffa44747999d4b958f043..43dd4089f123e7aa0ea2206a38c8c0f02c3f9f98 100644 (file)
--- a/src/gallium/drivers/v3d/v3dx_draw.c
+++ b/src/gallium/drivers/v3d/v3dx_draw.c
@@ -558,6 +558,13 @@ v3d_draw_vbo(struct pipe_context *pctx, const struct pipe_draw_info *info)
                         }
                 }
         }
+
+        /* A flush is required in between a TF draw and any following TF specs
+         * packet, or the GPU may hang.  Just flush each time for now.
+         */
+        if (v3d->streamout.num_targets)
+                cl_emit(&job->bcl, TRANSFORM_FEEDBACK_FLUSH_AND_COUNT, flush);
+
         job->draw_calls_queued++;
 
         /* Increment the TF offsets by how many verts we wrote.  XXX: This