IB/core: remove ib_get_dma_mr
We now only use it from ib_alloc_pd to create a local DMA lkey if the device doesn't provide one, or a global rkey if the ULP requests it. This patch removes ib_get_dma_mr and open codes the functionality in ib_alloc_pd so that we can simplify the code and prevent abuse of the functionality. As a side effect we can also simplify things by removing the valid access bit check, and the PD refcounting. In the future I hope to also remove the per-PD global MR entirely by shifting this work into the HW drivers, as one step towards avoiding the struct ib_mr overload for various different use cases. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NSagi Grimberg <sagi@grimberg.me> Reviewed-by: NJason Gunthorpe <jgunthorpe@obsidianresearch.com> Reviewed-by: NSteve Wise <swise@opengridcomputing.com> Signed-off-by: NDoug Ledford <dledford@redhat.com>
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