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

[Akinobu Mita]

2013/11/21 H. Peter Anvin <hpa@xxxxxxxxx>:
> On 11/19/2013 03:32 PM, Akinobu Mita wrote:
>> The DMA Contiguous Memory Allocator support on x86 is disabled when
>> swiotlb config option is enabled.  So DMA CMA is always disabled on
>> x86_64 because swiotlb is always enabled.  This attempts to support
>> for DMA CMA with enabling swiotlb config option.
>
> What is the use case?

I want to use DMA CMA for the feature that requires a single huge chunk
(about 64MB) of host memory.  Please refer 3 of 24 in:
http://www.jedec.org/sites/default/files/T_Fujisawa_MF_2013.pdf
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