Bug 109219 - iommu_intel=on + i915 incompatibility in 4.17, 4.19.13 and drm-tip
Summary: iommu_intel=on + i915 incompatibility in 4.17, 4.19.13 and drm-tip
Status: NEEDINFO
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/Intel (show other bugs)
Version: DRI git
Hardware: Other All
: medium normal
Assignee: Intel GFX Bugs mailing list
QA Contact: Intel GFX Bugs mailing list
URL: https://lore.kernel.org/lkml/20181227...
Whiteboard: Triaged
Keywords:
Depends on:
Blocks:
 
Reported: 2019-01-04 00:55 UTC by e+i915
Modified: 2019-09-07 17:21 UTC (History)
3 users (show)

See Also:
i915 platform: ILK
i915 features:


Attachments
dmesg output with without iommu_intel set (51.34 KB, text/plain)
2019-01-04 00:55 UTC, e+i915
no flags Details
dmesg output with iommu_on (53.42 KB, text/plain)
2019-01-04 00:56 UTC, e+i915
no flags Details
Debian 4.17 config (124.59 KB, text/plain)
2019-01-04 00:57 UTC, e+i915
no flags Details

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Description e+i915 2019-01-04 00:55:28 UTC
Created attachment 142968 [details]
dmesg output with without iommu_intel set

iommu_intel=on fails with i915 on x201 Thinkpad.

Thread on LKML: https://lore.kernel.org/lkml/20181227114948.ev4b3jte3ubsc5us@dcvr/T/
Comment 1 e+i915 2019-01-04 00:56:17 UTC
Created attachment 142969 [details]
dmesg output with iommu_on
Comment 2 e+i915 2019-01-04 00:57:12 UTC
Created attachment 142970 [details]
Debian 4.17 config
Comment 3 Lakshmi 2019-07-03 08:28:00 UTC
My apologies for responding on this issue so late.

@Joonas, any suggestion how to proceed with this issue?
Comment 4 Lakshmi 2019-08-28 10:07:03 UTC
> 
> Thread on LKML:
> https://lore.kernel.org/lkml/20181227114948.ev4b3jte3ubsc5us@dcvr/T/
In the attached logs I can not find the same warnings as mentioned in link.

Reporter, do you still see the kernel panics? Can you reproduce the issue with drmtip? (https://cgit.freedesktop.org/drm-tip).
Comment 5 Chris Wilson 2019-09-07 17:21:53 UTC
Note that Ironlake igfx + iommu is known to be a bad mix -- the gpu cannot be active while iommu is remapped, it seems doubtful that we are able to do that or if that is the only workaround required.


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