On 10/5/2017 11:28 AM, Chris Wilson wrote:
Quoting Michel Thierry (2017-10-05 19:19:27)
WaDisableCtxRestoreArbitration was only applied for bdw and chv, but
this changed after the code got moved to gen8_emit_bb_start (and, at
least in my tree, there is no gen9_emit_bb_start).
But I need to make sure we enable arbitration at some point. :)
It may not need the w/a name, but I was making very sure we didn't start
a BB without ARB, or context-switch into the middle of a batch without
ARB. That was my thinking, that there was no harm in overkill if we set
it more often than strictly necessary.
Ok, thanks for the detailed explanation and yes, probably no harm in
setting MI_ARB_ON.
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