[Bug 110980] [CI][SHARDS] igt at perf_pmu@busy-double-start-bcs0 - dmesg-warn - Failed to idle engines, declaring wedged!

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110980

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 8db7933ee3d442627c716ee49a70fa3aef18640d (HEAD -> drm-intel-next-queued,
drm-intel/for-linux-next, drm-intel/drm-intel-next-queued)
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Mon Jun 24 10:20:09 2019 +0100

    drm/i915/execlists: Always clear ring_pause if we do not submit

    In the unlikely case (thank you CI!), we may find ourselves wanting to
    issue a preemption but having no runnable requests left. In this case,
    we set the semaphore before computing the preemption and so must unset
    it before forgetting (or else we leave the machine busywaiting until the
    next request comes along and so likely hang).

    v2: Replace readback with only a wmb after asserting the semaphore

    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com>
    Reviewed-by: Mika Kuoppala <mika.kuoppala at linux.intel.com>
    Link:
https://patchwork.freedesktop.org/patch/msgid/20190624092009.30189-1-chris@chris-wilson.co.uk

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