[Bug 109408] [Kabylake] RPS waitboost regression since v4.20

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109408

--- Comment #3 from Chris Wilson <chris at chris-wilson.co.uk> ---
2 more caught my eye in the diff as potentials,

commit 90098efacc4c3e2e4f6262a657d6b520ecfb2555
Author: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Date:   Wed Dec 5 11:33:24 2018 +0000

    drm/i915: Introduce per-engine workarounds

(looks like you need to jump to just before

commit 009367791f31afa0842854e7ea0acc9edf70ccaf
Author: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Date:   Wed Dec 5 11:33:23 2018 +0000

    drm/i915: Record GT workarounds in a list

as it doesn't look like a clean revert)

and

commit 11abf0c5a021af683b8fe12b0d30fb1226d60e0f
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Fri Sep 14 09:00:15 2018 +0100

    drm/i915: Limit the backpressure for i915_request allocation


Other than that, not much appears to have happened in i915-land between v4.19
and v4.20 :|

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