[Bug 68410] [bisected ivb] Small black box corruption in firefox

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68410

--- Comment #33 from Chris Wilson <chris at chris-wilson.co.uk> ---
I would not say it was a missing flush - just some operation is not as
pipelined as intended and requires a top-of-pipe synchronisation.

To test that possibility, can you grab

commit c3fe60c15763c02b3b6238c77e6350d478cd8982
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Sun Oct 6 17:27:22 2013 +0100

    sna/gen7: Add a always-stall debug option

    References: https://bugs.freedesktop.org/show_bug.cgi?id=68410
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

and then set

diff --git a/src/sna/gen7_render.c b/src/sna/gen7_render.c
index 9fac7b0f..b678974 100644
--- a/src/sna/gen7_render.c
+++ b/src/sna/gen7_render.c
@@ -46,7 +46,7 @@
 #include "gen4_vertex.h"

 #define ALWAYS_FLUSH 0
-#define ALWAYS_STALL 0
+#define ALWAYS_STALL 1

 #define NO_COMPOSITE 0
 #define NO_COMPOSITE_SPANS 0

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