Re: ✗ Fi.CI.BAT: failure for drm/i915/gen11: Add Wa_1604278689:icl,ehl

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On Fri, Aug 16, 2019 at 08:07:18AM +0100, Chris Wilson wrote:
> Quoting Patchwork (2019-08-16 00:52:20)
> > #### Possible regressions ####
> > 
> >   * igt@i915_selftest@live_hangcheck:
> >     - fi-icl-u3:          [PASS][1] -> [DMESG-FAIL][2]
> >    [1]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6714/fi-icl-u3/igt@i915_selftest@live_hangcheck.html
> >    [2]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_14040/fi-icl-u3/igt@i915_selftest@live_hangcheck.html
> >     - {fi-icl-dsi}:       [PASS][3] -> [DMESG-FAIL][4]
> >    [3]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6714/fi-icl-dsi/igt@i915_selftest@live_hangcheck.html
> >    [4]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_14040/fi-icl-dsi/igt@i915_selftest@live_hangcheck.html
> >     - {fi-icl-u4}:        [PASS][5] -> [DMESG-FAIL][6]
> >    [5]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6714/fi-icl-u4/igt@i915_selftest@live_hangcheck.html
> >    [6]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_14040/fi-icl-u4/igt@i915_selftest@live_hangcheck.html
> 
> All icl machines suffering a similar failure to reset an engine (not
> rcs!). We haven't seen that before, so it does look very suspicious.
> -Chris

Hmm.  So for a render engine register that's saved/restored as part of
the context, is there somewhere else I should be setting this value?  My
understanding was that the items added in *_ctx_workarounds_init only
applied to the render engine (since __intel_engine_init_ctx_wa bails out
for other engine classes), yet it seems it's the BCS engine that's
failing to reset with this patch?.  If I just I915_WRITE to this
register, won't the value only apply to whichever context is currently
executing on the RCS engine and be lost when other contexts switch in?


Matt

-- 
Matt Roper
Graphics Software Engineer
VTT-OSGC Platform Enablement
Intel Corporation
(916) 356-2795
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