[Bug 97104] [KBL IVB] kicked stuck waiters missed irq when running drv_missed_irq

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97104

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

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

--- Comment #8 from Chris Wilson <chris at chris-wilson.co.uk> ---
commit 83348ba84ee0d5d4d982e5382bfbc8b2a2d05e75
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Tue Aug 9 17:47:51 2016 +0100

    drm/i915: Move missed interrupt detection from hangcheck to breadcrumbs

    In commit 2529d57050af ("drm/i915: Drop racy markup of missed-irqs from
    idle-worker") the racy detection of missed interrupts was removed when
    we went idle. This however opened up the issue that the stuck waiters
    were not being reported, causing a test case failure. If we move the
    stuck waiter detection out of hangcheck and into the breadcrumb
    mechanims (i.e. the waiter) itself, we can avoid this issue entirely.
    This leaves hangcheck looking for a stuck GPU (inspecting for request
    advancement and HEAD motion), and breadcrumbs looking for a stuck
    waiter - hopefully make both easier to understand by their segregation.

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