[Bug 105348] [CI] [KBL only] gt at drv_selftest@live_hangcheck - fail - Failed assertion: err == 0 / incomplete system hang?

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105348

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

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

--- Comment #2 from Chris Wilson <chris at chris-wilson.co.uk> ---
I claim to have fixed the incompletes and kbl failures, as of

commit 028666793a0291b63eb61bae7252345821326a1b
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Fri Mar 30 14:18:01 2018 +0100

    drm/i915/selftests: Avoid repeatedly harming the same innocent context

    We don't handle resetting the kernel context very well, or presumably any
    context executing its breadcrumb commands in the ring as opposed to the
    batchbuffer and flush. If we trigger a device reset twice in quick
    succession while the kernel context is executing, we may end up skipping
    the breadcrumb.  This is really only a problem for the selftest as
    normally there is a large interlude between resets (hangcheck), or we
    focus on resetting just one engine and so avoid repeatedly resetting
    innocents.

    Something to try would be a preempt-to-idle to quiesce the engine before
    reset, so that innocent contexts would be spared the reset.

    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com>
    Cc: Michał Winiarski <michal.winiarski at intel.com>
    CC: Michel Thierry <michel.thierry at intel.com>
    Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
    Link:
https://patchwork.freedesktop.org/patch/msgid/20180330131801.18327-1-chris@chris-wilson.co.uk

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