How to allow caching of PCI addresses in user space?

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I am currently working on a univ. project which
requires caching of data stored on a remote computer
and accessed via PCI address mmapping to userspace.

I have repeatdly failed to enable caching of these
addresses.

The mmaping is done using remap_page_range.
I have tried various protection options without
success.

Does this have to do with anything concerning the
MTRR's?

How can I allow caching of PCI addresses accessed in
user space thorugh mmaping using remap_page_range?

Thanks,
Daniel Zinder
 

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