23 Nov
2011
23 Nov
'11
8:36 p.m.
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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dwmw2