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    SubjectProcess memory DMA access from devices, kiobuf ?

    We are doing work with FPGA's and have a Linux driver for a particular
    board that has these
    devices. For performance reasons the driver has the ability to DMA
    directly to process (user)
    memory. We have made use of the kiobuf routines such as
    "map_user_kiobuf()" to map into
    physical memory the user address space.
    I note that the RedHat kernels have a patched kernel containing the
    kiobuf code but the
    standard linux source does not right up to 2.4.2.
    Is there a better recommended way to perform DMA access to user memory
    from a device
    using the Linux kernel ?



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