[Bug 93264] Tonga VM Faults since llvm ScheduleDAGInstrs: Rework schedule graph builder.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93264

            Bug ID: 93264
           Summary: Tonga VM Faults since llvm ScheduleDAGInstrs: Rework
                    schedule graph builder.
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: adf.lists at gmail.com

R9285 using Unreal ElementalDemo to trigger this.

It doesn't start till well into the demo at the same place that triggered an
older resolved issue.

https://bugs.freedesktop.org/show_bug.cgi?id=93015
(so maybe Nicolai knows what happens at this point in demo)

bisecting llvm came up with

c0a189c3792865257c1383f176e5401373ed2270 is the first bad commit
commit c0a189c3792865257c1383f176e5401373ed2270
Author: Matthias Braun <matze at braunis.de>
Date:   Thu Dec 3 02:05:27 2015 +0000

    ScheduleDAGInstrs: Rework schedule graph builder.

    The new algorithm remembers the uses encountered while walking backwards
    until a matching def is found. Contrary to the previous version this:
    - Works without LiveIntervals being available
    - Allows to increase the precision to subregisters/lanemasks
      (not used for now)

    The changes in the AMDGPU tests are necessary because the R600 scheduler
    is not stable with respect to the order of nodes in the ready queues.

    Differential Revision: http://reviews.llvm.org/D9068


The demo continues to run/render OK, but I get thousands of -

amdgpu 0000:01:00.0: GPU fault detected: 147 0x07d04401
amdgpu 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x092D80FA
amdgpu 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x0A044001
VM fault (0x01, vmid 5) at page 153977082, read from 'TC7' (0x54433700) (68)
amdgpu 0000:01:00.0: GPU fault detected: 147 0x07d00401
amdgpu 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x0022D16B
amdgpu 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x0A0C4002
VM fault (0x02, vmid 5) at page 2281835, read from 'TC4' (0x54433400) (196)
amdgpu 0000:01:00.0: GPU fault detected: 147 0x07d04001
amdgpu 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x0022D163

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