[Bug 111378] [CI][DRMTIP]igt at perf_pmu@busy-no-semaphores-vcs0 - dmesg-warn- IRQs not enabled as expected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111378

Chris Wilson <chris at chris-wilson.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #4 from Chris Wilson <chris at chris-wilson.co.uk> ---
commit a79ca656b648e6851dd2f1eb0dcef86b278a8908
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Tue Aug 13 20:07:05 2019 +0100

    drm/i915: Push the wakeref->count deferral to the backend

    If the backend wishes to defer the wakeref parking, make it responsible
    for unlocking the wakeref (i.e. bumping the counter). This allows it to
    time the unlock much more carefully in case it happens to needs the
    wakeref to be active during its deferral.

    For instance, during engine parking we may choose to emit an idle
    barrier (a request). To do so, we borrow the engine->kernel_context
    timeline and to ensure exclusive access we keep the
    engine->wakeref.count as 0. However, to submit that request to HW may
    require a intel_engine_pm_get() (e.g. to keep the submission tasklet
    alive) and before we allow that we have to rewake our wakeref to avoid a
    recursive deadlock.

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