Bug 110980 - [CI][SHARDS] igt@perf_pmu@busy-double-start-bcs0 - dmesg-warn - Failed to idle engines, declaring wedged!
Summary: [CI][SHARDS] igt@perf_pmu@busy-double-start-bcs0 - dmesg-warn - Failed to idl...
Status: RESOLVED FIXED
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/Intel (show other bugs)
Version: XOrg git
Hardware: Other All
: high normal
Assignee: Intel GFX Bugs mailing list
QA Contact: Intel GFX Bugs mailing list
URL:
Whiteboard: ReadyForDev
Keywords:
Depends on:
Blocks:
 
Reported: 2019-06-24 10:58 UTC by Martin Peres
Modified: 2019-06-24 11:08 UTC (History)
1 user (show)

See Also:
i915 platform: KBL
i915 features: GEM/Other


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Description Martin Peres 2019-06-24 10:58:54 UTC
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6318/shard-kbl3/igt@perf_pmu@busy-double-start-bcs0.html

<6> [680.854903] [IGT] perf_pmu: starting subtest busy-double-start-bcs0
<3> [684.059453] i915 0000:00:02.0: Failed to idle engines, declaring wedged!
Comment 1 CI Bug Log 2019-06-24 10:59:32 UTC
The CI Bug Log issue associated to this bug has been updated.

### New filters associated

* KBL: igt@perf_pmu@busy-double-start-bcs0 - dmesg-warn - Failed to idle engines, declaring wedged!
  - https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6318/shard-kbl3/igt@perf_pmu@busy-double-start-bcs0.html
Comment 2 Chris Wilson 2019-06-24 11:08:26 UTC
commit 8db7933ee3d442627c716ee49a70fa3aef18640d (HEAD -> drm-intel-next-queued, drm-intel/for-linux-next, drm-intel/drm-intel-next-queued)
Author: Chris Wilson <chris@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@chris-wilson.co.uk>
    Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
    Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
    Link: https://patchwork.freedesktop.org/patch/msgid/20190624092009.30189-1-chris@chris-wilson.co.uk


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