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    SubjectRe: [RFC] Simple userspace interface for PCI drivers
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    Matt Porter <mporter@embeddedalley.com> writes:
    >
    > What about portable access to the PCI DMA API from userspace?

    We'll definitely need this for X11 anyways. Currently it is not
    possible to run the standard X server with a IOMMU that isolates
    the graphics card because it has no way to get at the GPU MMIO
    registers then.

    My long-term plan was to integrate it in /sys/bus/pci mmaps
    (together with PAT etc.). When you mmap it there the kernel
    allocates a DMA mapping and then frees it on unmap.

    Then it should hopefully just work.

    -Andi
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