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    SubjectRe: [Intel-gfx] [PATCH] iommu: export no_iommu and dmar_disabled symbols
    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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