Messages in this thread | | | Subject | Re: [Intel-gfx] [PATCH] iommu: export no_iommu and dmar_disabled symbols | From | David Woodhouse <> | Date | Wed, 23 Nov 2011 20:36:00 +0000 |
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On Wed, 2011-11-23 at 16:42 -0200, Eugeni Dodonov wrote: > Those are needed by the rc6 and semaphores support in i915 driver. > > In i915 driver, we do not enable either rc6 or semaphores on SNB when dmar > is enabled. So we use those variables to check the io remapping and iommu > status.
This is horrid. In the general case, drivers have no business knowing this. We need to properly identify what is wrong with this hardware, and put in a quirk for it — perhaps refusing to enable the IOMMU at all on the broken chipsets.
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