[Bug 106947] [CI] igt at drv_selftest@live_hangcheck - dmesg-fail - Failed to switch back to kernel context; declaring wedged

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106947

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 5db1d4ea91b6ee447c4ae01f7f56803e32e690b1
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Mon Jun 4 08:34:40 2018 +0100

    drm/i915/execlists: Push the tasklet kick after reset to reset_finish

    In the unlikely case where we have failed to keep submitting to the GPU,
    we end up with the ELSP queue empty but a pending queue of requests.
    Here, we skip the per-engine reset as there is no guilty request, but in
    doing so we also skip the engine restart leaving ourselves with a
    permanently hung engine. A quick way to recover is by moving the tasklet
    kick to execlists_reset_finish() (from init_hw). We still emit the error
    on hanging, so the error is not lost but we should be able to recover.

    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Cc: Mika Kuoppala <mika.kuoppala at intel.com>
    Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
    Cc: Michel Thierry <michel.thierry at intel.com>
    Link:
https://patchwork.freedesktop.org/patch/msgid/20180604073441.6737-2-chris@chris-wilson.co.uk
    Reviewed-by: Mika Kuoppala <mika.kuoppala at intel.com>

We need to be careful to not mistake the STOP_RING hangs, bug 106560.

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