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    SubjectRe: [PATCH] x86: enable DMA CMA with swiotlb
    On 11/21/2013 07:02 AM, Akinobu Mita wrote:
    >
    > I want to use DMA CMA for the feature that requires a single huge chunk
    > (about 64MB) of host memory.

    That is tautological. "I want to use the Contiguous Memory Allocator to
    allocate contiguous memory."

    > Please refer 3 of 24 in:
    > http://www.jedec.org/sites/default/files/T_Fujisawa_MF_2013.pdf

    But yes, it makes sense that a device using host memory would not be
    able to leverage swiotlb, because the software simply has no clue what
    the DMA transactions are. In that sense it is fundamentally different
    from a real IOTLB.

    -hpa



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