[Bug 93015] Tonga Elemental segfault + VM faults since radeon: implement r600_query_hw_get_result via function pointers

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=93015

            Bug ID: 93015
           Summary: Tonga Elemental segfault + VM faults since  radeon:
                    implement r600_query_hw_get_result via function
                    pointers
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: adf.lists@gmail.com

Unreal 4.5 Elemental demo on r9 285 using powerplay kernel.

Since mesa commit -

commit 50f0f938e3a577647fdfb6bdbb4ad3da252aa791
Author: Nicolai Hähnle <nhaehnle@gmail.com>
Date:   Fri Nov 13 00:27:34 2015 +0100

    radeon: implement r600_query_hw_get_result via function pointers

    We will need the clear_result override for the batch query implementation.

About a minute into the demo (always same place) the demo will catch a segfault
and quit.

In dmesg I see a few VM faults.

While confirming the bisect I see that though it doesn't crash on the commit
before above =

commit c207c55fc08a1bf3dd40e79b3aaec34afbee2e55
Author: Nicolai Hähnle <nhaehnle@gmail.com>
Date:   Wed Nov 18 12:05:11 2015 +0100

    radeon: split hw query buffer handling from cs emit

    The idea here is that driver queries implemented outside of common code
    will use the same query buffer handling with different logic for starting
    and stopping the corresponding counters.

At the point where it would have crashed I start getting flooded with VM faults

[17771.298259] VM fault (0x14, vmid 5) at page 1204016, write from 'TC0'
(0x54433000) (8)
[17771.330661] amdgpu 0000:01:00.0: GPU fault detected: 146 0x04c20814
[17771.330665] amdgpu 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_ADDR  
0x00125E98
[17771.330666] amdgpu 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_STATUS
0x0B008014
[17771.330668] VM fault (0x14, vmid 5) at page 1203864, write from 'TC0'
(0x54433000) (8)
[17771.363320] amdgpu 0000:01:00.0: GPU fault detected: 146 0x05e20814
[17771.363323] amdgpu 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_ADDR  
0x001264BC
[17771.363325] amdgpu 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_STATUS
0x0B008014
[17771.363326] VM fault (0x14, vmid 5) at page 1205436, write from 'TC0'
(0x54433000) (8)
[17771.395828] amdgpu 0000:01:00.0: GPU fault detected: 146 0x06620814
[17771.395832] amdgpu 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_ADDR  
0x001260CC
[17771.395833] amdgpu 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_STATUS
0x0B008014
[17771.395834] VM fault (0x14, vmid 5) at page 1204428, write from 'TC0'
(0x54433000) (8)

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