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IB/core: Add umem function to read data from user-space

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In some drivers there's a need to read data from a user space area
that was pinned using ib_umem when running from a different process
context.

The ib_umem_copy_from function allows reading data from the physical
pages pinned in the ib_umem struct.

Signed-off-by: Haggai Eran <[email protected]>
Signed-off-by: Roland Dreier <[email protected]>
This commit is contained in:
Haggai Eran 2014-12-11 17:04:13 +02:00 • committed by Roland Dreier
commit c5d76f130b
2 changed files with 36 additions and 0 deletions
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2
include/rdma/ib_umem.h
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@ -84,6 +84,8 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
size_t size, int access, int dmasync);
void ib_umem_release(struct ib_umem *umem);
int ib_umem_page_count(struct ib_umem *umem);
int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset,
size_t length);
#else /* CONFIG_INFINIBAND_USER_MEM */