[Bug 105341] [CI] igt at gem_eio@in-flight-external - incomplete - i915_gem_find_active_request:2880 GEM_BUG_ON((__builtin_constant_p((DMA_FENCE_FLAG_SIGNALED_BIT)) ? constant_test_bit((DMA_FENCE_FLAG_SIGNALED_BIT), (&request->fence.flags)) : variable_test_bit((DMA_FENCE

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105341

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

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

--- Comment #6 from Chris Wilson <chris at chris-wilson.co.uk> ---
commit ac697ae8013a7c7301174c9c3b02a92fe418b7ea
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Thu Mar 15 15:10:15 2018 +0000

    drm/i915: Stop engines when declaring the machine wedged

    If we fail to reset the GPU, we declare the machine wedged. However, the
    GPU may well still be running in the background with an in-flight
    request. So despite our efforts in cleaning up the request queue and
    faking the breadcrumb in the HWSP, the GPU may eventually write the
    in-flght seqno there breaking all of our assumptions and throwing the
    driver into a deep turmoil, wedging beyond wedged.

    To avoid this we ideally want to reset the GPU. Since that has already
    failed, make sure the rings have the stop bit set instead. This is part
    of the normal GPU reset sequence, but that is actually disabled by
    igt/gem_eio to force the wedged state. If we assume the worst, we must
    poke at the bit again before we give up.

    v2: Move the intel_gpu_reset() from set-wedged in the reset error path
    into i915_gem_set_wedged() itself. Even if the reset fails (e.g. if it is
    disabled by gem_eio), it still tries to make sure the engines are
    stopped. For i915_gem_set_wedged() callers from outside of i915_reset(),
    this should make sure the GPU is disabled while the driver is marked as
    being wedged.

    Testcase: igt/gem_eio
    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: Michal Wajdeczko <michal.wajdeczko at intel.com>
    Cc: Michel Thierry <michel.thierry at intel.com>
    Reviewed-by: Mika Kuoppala <mika.kuoppala at linux.intel.com>
    Link:
https://patchwork.freedesktop.org/patch/msgid/20180315151015.22741-1-chris@chris-wilson.co.uk

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