Re: [RFC] [PATCH 0/3] ioat: DMA engine support

[Roland Dreier]

    Kumar> I'm actually searching for any examples of drivers that
    Kumar> deal with the issues related to DMA'ng directly two and
    Kumar> from user space memory.

It's not quite the same story as what you're doing with DMA engines
inside the CPU, but you could look at drivers/infiniband, particularly
drivers/infiniband/core/uverbs_mem.c.  That handles pinning and
getting DMA addresses for user memory that will be used as a DMA
target in the future.

 - R.
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