[Bug 77263] [BDW GT3]System hangs while running glxgear with SNA

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77263

--- Comment #13 from Chris Wilson <chris at chris-wilson.co.uk> ---
One thing to try is

commit b12bc035fb8ee40bb382e66604e869b729270189
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Tue Apr 22 12:30:29 2014 +0100

    sna: Add a DBG aide to disable hardware execution

    Submit a dummy batch so that we still build, submit batches and perform
    relocations, but do not actually invoke the GPU. This can be useful when
    looking at mysterious hardware hangs.

    References: https://bugs.freedesktop.org/show_bug.cgi?id=77263
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

and

diff --git a/src/sna/kgem.c b/src/sna/kgem.c
index 82199a1..68b0917 100644
--- a/src/sna/kgem.c
+++ b/src/sna/kgem.c
@@ -61,7 +61,7 @@ static struct kgem_bo *
 search_snoop_cache(struct kgem *kgem, unsigned int num_pages, unsigned flags);

 #define DBG_NO_HW 0
-#define DBG_NO_EXEC 0
+#define DBG_NO_EXEC 1
 #define DBG_NO_TILING 0
 #define DBG_NO_CACHE 0
 #define DBG_NO_CACHE_LEVEL 0

That will isolate the fault in either the driver or the hardware.

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