[Bug 108898] GPU hangs with GfxBench Manhattan GL tests

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108898

            Bug ID: 108898
           Summary: GPU hangs with GfxBench Manhattan GL tests
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: eero.t.tamminen at intel.com
        QA Contact: dri-devel at lists.freedesktop.org

Setup:
- FullHD monitor (through HDMI KVM)
- HadesCanyon KBL i7-8809G ([AMD/ATI] Vega [Radeon RX Vega M] (rev c0))
- Ubuntu 18.04
- drm-tip git kernel v4.20-rc4 (i.e. kernel.org v4.20-rc4 kernel + latest drm
code from yesterday)
- Mesa git (c120dbfe4d) with AMD VEGAM renderer
- X server git version
- Proprietary GfxBench v5, but public GfxBench v4 should have same tests:
  http://gfxbench.com

Test-cases:
* Manhattan 3.0 offscreen:
  bin/testfw_app --gfx glfw --gl_api desktop_core --width 1920 --height 1080
--fullscreen 1 --test_id gl_manhattan_off
* Manhattan 3.1 onscreen:
  bin/testfw_app --gfx glfw --gl_api desktop_core --width 1920 --height 1080
--fullscreen 1 --test_id gl_manhattan31

Expected outcome:
* No GPU timeouts

Actual outcome:
* 1 out of 3 runs gives in dmesg:
[ 2817.689624] [drm:drm_sched_job_timedout [gpu_sched]] *ERROR* ring gfx
timeout, but soft recovered

NOTE: These were happening already when we started testing this machine in mid
October, with Mesa 18cc65edf8480 & drm-tip kernel v4.19-rc8.

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