https://bugs.freedesktop.org/show_bug.cgi?id=105952

            Bug ID: 105952
           Summary: GPU hang on SI
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Drivers/Vulkan/radeon
          Assignee: mesa-dev@lists.freedesktop.org
          Reporter: t...@alternativegames.net
        QA Contact: mesa-dev@lists.freedesktop.org

GPU hangs when running any Vulkan program. I tested with vulkan-smoketest but
seems to happen with anything.

gmc_v6_0_process_interrupt: 28 callbacks suppressed
amdgpu 0000:01:00.0: GPU fault detected: 147 0x0f2a7001
amdgpu 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x0F47FFF9
amdgpu 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x0A070001
amdgpu 0000:01:00.0: VM fault (0x01, vmid 5) at page 256376825, read from ''
(0x00000000) (112)

Kernel 4.15.11 (current in Debian testing), LLVM 6.0.0, Pitcairn.

Bisected to:
4ad7595f350462c704fbe5b2bd2ca406c904e78e is the first bad commit
commit 4ad7595f350462c704fbe5b2bd2ca406c904e78e
Author: Samuel Pitoiset <samuel.pitoi...@gmail.com>
Date:   Wed Apr 4 12:12:03 2018 +0200

    radv: rename radv_emit_prefetch() to radv_emit_prefetch_L2()

    Signed-off-by: Samuel Pitoiset <samuel.pitoi...@gmail.com>
    Reviewed-by: Bas Nieuwenhuizen <b...@basnieuwenhuizen.nl>
    Tested-by: Dieter N├╝tzel <die...@nuetzel-hh.de>


Despite the commit message it seems to contain functional changes, in
particular it seems to enable some DMA transfers on all chips. It looks it
doesn't work on SI.

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