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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [BDW SKL IVB BYT HSW SNB] [Basic] GPU Hang with prime_busy basic tests"
href="https://bugs.freedesktop.org/show_bug.cgi?id=97076#c7">Comment # 7</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [BDW SKL IVB BYT HSW SNB] [Basic] GPU Hang with prime_busy basic tests"
href="https://bugs.freedesktop.org/show_bug.cgi?id=97076">bug 97076</a>
from <span class="vcard"><a class="email" href="mailto:yann.argotti@intel.com" title="yann <yann.argotti@intel.com>"> <span class="fn">yann</span></a>
</span></b>
<pre>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</pre>
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