[Nouveau] [Bug 111724] New: NVE6 (GK106) memory re-clocking breaks GpuTest plot3d benchmark

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111724

            Bug ID: 111724
           Summary: NVE6 (GK106) memory re-clocking breaks GpuTest plot3d
                    benchmark
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: not set
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: mmenzyns at redhat.com
        QA Contact: xorg-team at lists.x.org

I have stepped upon a problem with NVE6 (GK106) in GpuTest
https://www.geeks3d.com/gputest/ plot3d benchmark that occurs only in plot3d
and nowhere else. There are visible glitches and when left for a longer time
Nouveau seems to crash.

The GPU has 4 profiles: 
07: core 324 MHz memory 648 MHz
0a: core 324-862 MHz memory 1620 MHz
0d: core 549-1228 MHz memory 6008 MHz
0f: core 549-1228 MHz memory 6008 MHz

The problem occurs when switching re-clocking profile directly from 648 MHz to
6008 MHz skipping the 0xA 1620 MHz profile. If gone through 0xA profile
everything works fine.

If the memory re-clocking is disabled, it works fine. If there is 0xF profile
set directly (breaking the benchmark) with memory re-clocking enabled, then the
nouveau gets unloaded, and nouveau gets loaded back with memory re-clocking
disabled, when changing re-clocking profiles it still glitches. Which implies
something that breaks this is only touched when the memory re-clocking is
enabled.

I have gone through all nouveau pmu scripts traces, checked every difference
(of the scripts) with Nvidia driver and nothing seemed to affect this problem
that has different values than Nvidia. Actual code which was changing the
values for 0xf profile to be same as Nvidia is here:
https://github.com/mmenzyns/nouveau/tree/linux-5.2_gk106_memory_issues. The
scripts for the highest-profile should be almost identical between Nvidia and
Nouveau.

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