[Bug 90266] Unigine Heaven 4.0 logging vm faults since radeon/llvm: Run LLVM's instruction combining pass

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90266

            Bug ID: 90266
           Summary: Unigine Heaven 4.0 logging vm faults since
                    radeon/llvm: Run LLVM's instruction combining pass
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: adf.lists at gmail.com
        QA Contact: dri-devel at lists.freedesktop.org

Related to 

https://bugs.freedesktop.org/show_bug.cgi?id=90056

Unlike valley I thought heaven 4.0 wasn't affected by above as it runs and
looks OK.

There is however an issue, again "fixed" by reverting mesa commit 

commit c6d79ed289a75f13c65f011be870f7e43a0fedc7
Author: Tom Stellard <thomas.stellard at amd.com>
Date:   Fri Apr 10 17:07:16 2015 +0000

    radeon/llvm: Run LLVM's instruction combining pass


This issue is thousands of lines of logging like below.

This happens with or without the llvm fix in the valley bug.

Will attach R600_DEBUG=ps,vs,gs with and without above mesa commit reverted.
The debug logs were done with todays llvm,mesa so the valley fix in in llvm.

The errors -

[ 7288.184664] VM fault (0x01, vmid 14) at page 185032279, read from TC (4)
[ 7288.184667] radeon 0000:01:00.0: GPU fault detected: 147 0x0afc0401
[ 7288.184668] radeon 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_ADDR  
0x0B075E57
[ 7288.184670] radeon 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_STATUS
0x1C004001
[ 7288.184671] VM fault (0x01, vmid 14) at page 185032279, read from TC (4)
[ 7288.184695] radeon 0000:01:00.0: GPU fault detected: 147 0x0afc0401
[ 7288.184696] radeon 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_ADDR  
0x0B075E57
[ 7288.184698] radeon 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_STATUS
0x1C004001

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