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: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Reviewed-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

1 files changed, 0 insertions, 12 deletions

diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index 4bdd898697cf..0a6c70895c8b 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -2879,18 +2879,6 @@ static inline int ib_req_ncomp_notif(struct ib_cq *cq, int wc_cnt)
 }
 
 /**
- * ib_get_dma_mr - Returns a memory region for system memory that is
- *   usable for DMA.
- * @pd: The protection domain associated with the memory region.
- * @mr_access_flags: Specifies the memory access rights.
- *
- * Note that the ib_dma_*() functions defined below must be used
- * to create/destroy addresses used with the Lkey or Rkey returned
- * by ib_get_dma_mr().
- */
-struct ib_mr *ib_get_dma_mr(struct ib_pd *pd, int mr_access_flags);
-
-/**
  * ib_dma_mapping_error - check a DMA addr for error
  * @dev: The device for which the dma_addr was created
  * @dma_addr: The DMA address to check