[Nouveau] [Bug 93629] [NVE6] complete system freeze, PGRAPH engine fault on channel 2, SCHED_ERROR [ CTXSW_TIMEOUT ]

[bugzilla-daemon at bugs.freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93629

--- Comment #19 from Roy <rspliet at eclipso.eu> ---
Created attachment 123609
  --> https://bugs.freedesktop.org/attachment.cgi?id=123609&action=edit
Race condition fix for nouveau firmware

For anyone who experiences random hangs using the nouveau firmware and have
spotted "SCHED_ERROR [ CTXSW_TIMEOUT ]" in the logs, please build a kernel with
the attached patch and run using the nouveau firmware. Minimum kernel required
is 4.6.

I've tested this on one machine of my own and have a strong indication that
this improves the situation, but unfortunately it is difficult to distinguish
random infrequent hangs from no hangs.

--- Comment #20 from Alexandre Courbot <gnurou at gmail.com> ---
Roy, NVE6 is rock-stable on my end using your patch. Feel free to add my

Tested-by: Alexandre Courbot <acourbot at nvidia.com>

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