[Bug 104259] [BAT] igt at gem_sync@basic-all - fail - Failed assertion: !"GPU hung"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104259

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

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

--- Comment #2 from Chris Wilson <chris at chris-wilson.co.uk> ---
commit 7b6da818d86fddfc88ddb523d6539c1bf7fc6302
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Sat Dec 16 00:03:34 2017 +0000

    drm/i915: Restore the kernel context after a GPU reset on an idle engine

    As part of the system requirement for powersaving is that we always have
    a context loaded. Upon boot and resume, we load the kernel_context to
    ensure that some valid state is set before powersaving kicks in, we
    should do so after a full GPU reset as well. We only need to do so for
    an idle engine, as any active engines will restart by executing the
    stuck request, loading its context. For the idle engine, we create a
    new request to load the kernel_context instead.

    For whatever reason, perfoming a dummy execute on the idle engine after
    reset papers over a subsequent GPU hang in rare circumstances, even on
    machines not using contexts (e.g. Pineview).

    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104259
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104261
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com>
    Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
    Reviewed-by: Michel Thierry <michel.thierry at intel.com>
    Link:
https://patchwork.freedesktop.org/patch/msgid/20171216000334.8197-1-chris@chris-wilson.co.uk

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