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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