Re: [PATCH] x86: enable DMA CMA with swiotlb

[H. Peter Anvin]

On 11/22/2013 04:27 AM, Akinobu Mita wrote:
> 
> I'm currently working for integrating DMA CMA with intel-iommu which
> I can test.  Regardless of which dma ops is actually used, I would
> like to allocate large contiguous memory with dma_alloc_coherent()
> and tell the base address to the device.
> 
> We can use mem= or crashkernel= to reserve host memory, but it is
> complicated and unables to work with real IOMMU.
> 

If you have a real iotlb, why would you need contiguous memory?

	-hpa

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