[Bug 96743] [BYT, HSW, SKL, BXT, KBL] GPU hangs with GfxBench 4.0 CarChase

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96743

--- Comment #51 from Topi Pohjolainen <topi.pohjolainen at intel.com> ---
For quite some time I only saw _intel_batchbuffer_flush_fence() when switching
from render ring to blit ring. And specifically because the following condition
fired:

   /* If we're switching rings, implicitly flush the batch. */
   if (unlikely(ring != brw->batch.ring) && brw->batch.ring != UNKNOWN_RING &&
       brw->gen >= 6)

I thought this was for some reason significant. But now I've gotten the hang
also when flushing due to running out of batch space and also from render ring
itself (brw_try_draw_prims()).

What is also curious is that error decode shows the batch buffer containing
garbage starting from the beginning but both brw->batch->bo->map_cpu and
brw->batch->last_bo->map_cpu give me sane values (0x7a000003 and 0x54c00006
respectively). Error decode says the first dword is 0x423303d0.

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