[Bug 110380] [CI][SHARDS] igt at gem_exec_schedule@semaphore-codependency - fail - Failed assertion: !"GPU hung"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110380

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

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

--- Comment #4 from Chris Wilson <chris at chris-wilson.co.uk> ---
commit b7404c7ecb38b66f103cec694e23a8e99252829e (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:   Tue Apr 9 16:29:22 2019 +0100

    drm/i915: Bump ready tasks ahead of busywaits

    Consider two tasks that are running in parallel on a pair of engines
    (vcs0, vcs1), but then must complete on a shared engine (rcs0). To
    maximise throughput, we want to run the first ready task on rcs0 (i.e.
    the first task that completes on either of vcs0 or vcs1). When using
    semaphores, however, we will instead queue onto rcs in submission order.

    To resolve this incorrect ordering, we want to re-evaluate the priority
    queue when each of the request is ready. Normally this happens because
    we only insert into the priority queue requests that are ready, but with
    semaphores we are inserting ahead of their readiness and to compensate
    we penalize those tasks with reduced priority (so that tasks that do not
    need to busywait should naturally be run first). However, given a series
    of tasks that each use semaphores, the queue degrades into submission
    fifo rather than readiness fifo, and so to counter this we give a small
    boost to semaphore users as their dependent tasks are completed (and so
    we no longer require any busywait prior to running the user task as they
    are then ready themselves).

    v2: Fixup irqsave for schedule_lock (Tvrtko)

    Testcase: igt/gem_exec_schedule/semaphore-codependency
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
    Cc: Dmitry Rogozhkin <dmitry.v.rogozhkin at intel.com>
    Cc: Dmitry Ermilov <dmitry.ermilov at intel.com>
    Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
    Link:
https://patchwork.freedesktop.org/patch/msgid/20190409152922.23894-1-chris@chris-wilson.co.uk

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