[Mesa-dev] [PATCH 0/10] Tessellation shaders for Gen7/7.5.

[Connor Abbott]

On Thu, Dec 24, 2015 at 8:34 PM, Kenneth Graunke <kenneth at whitecape.org> wrote:
> This morning, I woke up and somehow "knew" what was causing my HS GPU hangs
> on Gen7/7.5.  It turns out I was (completely) wrong, but through some
> miraculous series of illogical leaps, I arrived at a solution anyway.
>
> I don't honestly know how I got it working on Christmas Eve after
> failing to figure it out for months on end.  After exhausting every bit
> of documentation and every tool available, and finding zero information,
> somehow randomly flailing in the dark resulted in a solution, today of
> all days.  Honestly, I had pretty much no hope for figuring this out,
> so I'm relieved to have it working at last...
>
> It turns out that setting interleave on the EOT URB write does bad things.
> Fixing this fixed all the GPU hangs when releasing inputs one at a time,
> I then added back the ability to release inputs in pairs, which caused
> more GPU hangs.  It turned out I needed to be more careful and enable
> both halves.
>
> Everything seems to be working just fine now, so let's turn it on.
>
> --Ken
>
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Merry Christmas, and stop working, Ken!