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

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

On Mon, Nov 04, 2013 at 05:57:37AM -0800, Thomas Hellstrom wrote:
> 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.

Ooooh. Neat! Are there any RFC patches available?
> 
> 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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