ntb_tool: Add memory window debug support
We allocate some memory window buffers when the link comes up, then we provide debugfs files to read/write each side of the link. This is useful for debugging the mapping when writing new drivers. Signed-off-by: NLogan Gunthorpe <logang@deltatee.com> Acked-by: NAllen Hubbe <Allen.Hubbe@emc.com> Signed-off-by: NJon Mason <jdmason@kudzu.us>
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