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    SubjectRe: problems doing direct dma from a pci device to pci-e device
    On Fri, Sep 11, 2009 at 04:04:00PM -0400, Mark Hounschell wrote:
    > A quick readup on the IOMMU makes me think that if it does use one, that
    > could certainly cause my problem. I'm using bus addresses plugged into
    > page tables that live in the gpiohsd card obtained from virt2bus.

    If you haven't yet, take a look at Documentation/DMA-API.txt and
    DMA-mapping.txt . virt2bus has been deprecated for DMA since 2.4 releases.

    grant


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