[Bug 112226] [HadesCanyon] GPU hangs don't anymore recover (although kernel still claims that they do)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=112226

            Bug ID: 112226
           Summary: [HadesCanyon] GPU hangs don't anymore recover
                    (although kernel still claims that they do)
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: not set
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: eero.t.tamminen at intel.com

Setup:
* HW: KBL HadesCanyon (i7-8809G with Radeon RX Vega M GH)
* OS: Ubuntu 18.04 with Unity desktop (compiz)
* SW: Git builds of drm-tip kernel, Mesa and X server

Issue:
* AMD GPU driver stopped recovering from bug 108898 KBL HadesCanyon GPU hangs.

It still claims to recover from the bug:
-------------------------------------------------------
[ 1057.512690] Iteration 2/3: bin/testfw_app --gfx glfw --gl_api desktop_core
--width 1920 --height 1080 --fullscreen 1 --test_id gl_manhattan
[ 1119.867403] [drm:amdgpu_dm_atomic_commit_tail [amdgpu]] *ERROR* Waiting for
fences timed out!
[ 1124.987449] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx timeout, but
soft recovered
-------------------------------------------------------
But now all 3D tests run after this error will fail.

This started to happen between following (drm-tip) kernel commits:
* 2019-10-28 16:01:46: 912b87256c: drm-tip: 2019y-10m-28d-16h-00m-10s UTC
integration manifest
* 2019-10-29 17:58:05: a2c9f8ce2a: drm-tip: 2019y-10m-29d-17h-57m-39s UTC
integration manifest

And following Mesa commits:
* 2019-10-28 17:47:06: d298740a1c: iris: Disallow incomplete resource creation
* 2019-10-29 16:19:34: ff6e148a3d: freedreno/a6xx: add a618 support


Note:
* I'm not seeing the same issue by using few months old Mesa with latest
drm-tip kernel, so some change in Mesa triggers this kernel issue
* If latest Mesa is used with drm-tip kernel 5.3, 4/5 times X fails to start. 
This started to happen with Mesa version within couple of days of the GPU hang
recovery issue, so potentially there are more issue in Mesa (HadesCanyon) AMD
support

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