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

[Paul Mackerras]

Greg KH writes:

> Ok, sorry, it wasn't blindingly obvious that this was for pci sysfs
> devices that are mmaped, that makes a bit more sense.
> 
> But I'd like to see what ioctl is wanted here first.

I believe the ioctl would be to set whether the mapping goes to I/O or
memory space, and whether write-combining is allowed.

So the alternative to the ioctl would be to have multiple files in
sysfs, one per combination of modes -- i.e., 4 files, or 3 if we
exclude the "I/O with write combining" mode, which would be
reasonable.

Paul.
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