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| author |   Haggai Eran <haggaie@mellanox.com> | 2014-12-11 17:04:13 +0200 |
|---|---|---|
| committer |   Roland Dreier <roland@purestorage.com> | 2014-12-15 18:13:35 -0800 |
| commit | c5d76f130b286682b64c659eaf6af701e3d79a7b (patch) | |
| tree | 0431513226d065f1c46e106a78e3f51ddf723a2d /include/rdma/ib_umem.h | |
| parent | IB/core: Replace ib_umem's offset field with a full address (diff) | |
| download | linux-dev-c5d76f130b286682b64c659eaf6af701e3d79a7b.tar.xz linux-dev-c5d76f130b286682b64c659eaf6af701e3d79a7b.zip | |
IB/core: Add umem function to read data from user-space
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 <haggaie@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
Diffstat (limited to 'include/rdma/ib_umem.h')
| -rw-r--r-- | include/rdma/ib_umem.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/rdma/ib_umem.h b/include/rdma/ib_umem.h index 7ed6d4ff58dc..45bb04bc88cd 100644 --- a/include/rdma/ib_umem.h +++ b/include/rdma/ib_umem.h @@ -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 */ |