Re: [PATCH] drm/i915: Enable stolen for iommu on snb/ivb

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Quoting Martin Peres (2019-09-17 12:39:13)
> On 13/09/2019 19:43, Chris Wilson wrote:
> > Now that we have CI testing of iommu, let's enable stolen + iommu with a
> > lot more confidence that we can diagnose any potential erors.
> 
> AFAIK, we still haven't checked that these machines indeed have the
> IOMMU enabled yet. Am I wrong?

Hmm, let's have a quick look,

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6906/fi-snb-2600/boot0.txt
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6907/fi-snb-2520m/boot0.txt
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6905/shard-snb6/boot1.txt
No iommu

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6905/shard-hsw8/boot1.txt
<6>[    1.540343] pci 0000:00:02.0: Adding to iommu group 1

So only a smattering of coverage on Haswell (didn't check the farm1
ivb/hsw/byt).

So indeed hard to draw any conclusion from our test results at present.
Hopefully, Tomi will have some success in fighting with the BIOS.
-Chris
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