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Subjectuio_dmem_genirq.c and DMA mapping to user space ?

I am trying to use the uio_dmem_genirq.c driver for allocating DMA memory to a PCI device
using the uio_pci_generic.c driver.

I got as far as defining an UIO dev containing only Dynamic DMA memory and
now I am stuck.
I can see how DMA memory is allocated when opening the /dev/uio device but I cannot
figure out how to mmap this memory to User space as well so I can share this
memory with the PCI device and my user space driver.

What am I missing?

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