[Bug 105955] New: System stall on Supermicro SKL boards on HEVC FEI workloads

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105955

            Bug ID: 105955
           Summary: System stall on Supermicro SKL boards on HEVC FEI
                    workloads
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: dmitry.ermilov at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 138701
  --> https://bugs.freedesktop.org/attachment.cgi?id=138701&action=edit
reproducer

Running HEVC FEI encode media workloads we see a random system stall issue.

We observe the issue on specifically this hardware:
* Supermicro SYS-5019S-ML/X11SSH-F, BIOS 2.0c 10/06/2017 
* video card device ID 0x191d
We do not see the bug on other SKL systems in our possession.

The issue is reproducible on CentOS 7 (7.4) with 4.14 and drm-tip (commit
29940f138482ff38047287ad288cea1fcf1f73b4) kernels.

The issue is a regression. We could bisect the faulty patch, it's below:
https://patchwork.freedesktop.org/patch/65235/
>From bedc054eb8a2751aa22797c4a21a34029b3e5475 Mon Sep 17 00:00:00 2001
From: Imre Deak <imre.deak at intel.com>
Date: Wed, 18 Nov 2015 19:53:50 +0200
Subject: [PATCH 08/10] drm/i915/skl: re-enable power well support
Now that the known DMC/DC issues are fixed, let's try again and
re-enable the power well support. 

Please note that in order to boot on drm-tip we have to use additional
parameters:
intel_pstate=disable i915.enable_rc6=0 intel_idle.max_cstate=1

The Supermicro systems boot but i915 produces some warnings.
https://bugs.freedesktop.org/show_bug.cgi?id=105949 describes it better. 

Reproducer:
1) Build this stack:
https://software.intel.com/en-us/articles/build-and-debug-open-source-media-stack
2) Run:
./repr.sh
System stalls in 1-10 minutes.

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