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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #5 from Chris Wilson <chris at chris-wilson.co.uk> ---
https://cgit.freedesktop.org/~ickle/linux-2.6/log/?h=prescheduler

contains

commit 7b581cf26a4042e9bbb8410a31647e41cacafada
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Fri Jan 25 18:01:44 2019 +0000

    drm/i915: Apply rps waitboosting for dma_fence_wait_timeout()

    As time goes by, usage of generic ioctls such as drm_syncobj and
    sync_file are on the increase bypassing i915-specific ioctls like
    GEM_WAIT. Currently, we only apply waitboosting to our driver ioctls as
    we track the file/client and account the waitboosting to them. However,
    since commit 7b92c1bd0540 ("drm/i915: Avoid keeping waitboost active for
    signaling threads"), we no longer have been applying the client
    ratelimiting on waitboosts and so that information has only been used
    for debug tracking.

    Push the application of waitboosting down to the common
    i915_request_wait, and apply it to all foreign fence waits as well.

which might make a difference if the system has switched over to
sync_file/syncobj interfaces in preference to the i915 ioctls.

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