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. -- dwmw2
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