Messages in this thread | | | Date | Fri, 22 Nov 2013 00:02:14 +0900 | Subject | Re: [PATCH] x86: enable DMA CMA with swiotlb | From | Akinobu Mita <> |
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2013/11/21 H. Peter Anvin <hpa@zytor.com>: > 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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