[PATCH 0/2] Make the vmwgfx driver reasonably DMA-API compliant

[Thomas Hellstrom <thellstrom@vmware.com>]

These patches makes the vmwgfx driver use the DMA API to obtain valid
device addresses rather than blindly using physical addresses.

The main motivation is to be able to use a virtual IOMMU in the future.

Other TTM drivers typically map pages one by one rather than using a
scatter-gather list, but since we can benefit from having a single dma
address region set up by the IOMMU, we use a scatter-gather list instead.

Finally to be able to handle all the dma mapping modes, we locally extend the
scatter-gather list page iterator to handle also the direct physical- and
coherent cases.

Finally, the TTM DMA page pool is enabled also when the Intel IOMMU is active

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