Re: [RFC PATCH 08/12] PAT 64b: coherent mmap and sysfs bin ioctl

> Well the other alternative looks like having a second file per par
> bar.  Say resource0_wc to support the write-combining mode, possibly

The intention was to support memory not in bars, but give a generic
IOMMU mapped memory interface for user space e.g. for the X server.
But that needs a way to return the bus address for the mmap mapping
and ioctl was the best I came up with for that.
Given it was never finished.

-Andi
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