[Bug 97076] [BDW SKL IVB BYT HSW SNB] [Basic] GPU Hang with prime_busy basic tests

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97076

--- Comment #7 from yann <yann.argotti at intel.com> ---
>From these error dumps (same symptom), hung is happening in batch buffer
submitted by prime_busy with IPEHR 0x10000002 (MI_STORE_DATA_IMM)

for both SKL and BDW IOMMU is not enable but we have DMC 1.26 in SKL and hung
appears quicker on this system.

Here is extract from BDW dump:
ACTHD: 0x00000000 ffffc554
IPEHR: 0x10000002
INSTDONE: 0xffd7ffff
    busy: CS
    busy: GAM

and extract from batch buffer around active head 0xffffc554
...
0xffffc540:      0x10000002: MI_STORE_DATA_IMM
0xffffc544:      0xffffed50:    dword 1
0xffffc548:      0x00000000:    dword 2
0xffffc54c:      0x00000354:    dword 3
0xffffc550:      0x10000002: MI_STORE_DATA_IMM
0xffffc554:      0xffffed54:    dword 1
0xffffc558:      0x00000000:    dword 2
0xffffc55c:      0x00000355:    dword 3

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