diff options
| author |   Jianxin Xiong <jianxin.xiong@intel.com> | 2020-12-15 13:27:13 -0800 |
|---|---|---|
| committer |   Jason Gunthorpe <jgg@nvidia.com> | 2021-01-20 16:07:52 -0400 |
| commit | 368c0159d492d7fbdb5791b40c9263ec4e97a10f (patch) | |
| tree | cd16d9c4358935b05f317e4e2ed096d3e61e74f9 /drivers/infiniband/core/umem.c | |
| parent | RDMA/core/iwpm_msg: Add proper descriptions for 'skb' param (diff) | |
| download | linux-dev-368c0159d492d7fbdb5791b40c9263ec4e97a10f.tar.xz linux-dev-368c0159d492d7fbdb5791b40c9263ec4e97a10f.zip | |
RDMA/umem: Support importing dma-buf as user memory region
Dma-buf is a standard cross-driver buffer sharing mechanism that can be
used to support peer-to-peer access from RDMA devices.
Device memory exported via dma-buf is associated with a file descriptor.
This is passed to the user space as a property associated with the buffer
allocation. When the buffer is registered as a memory region, the file
descriptor is passed to the RDMA driver along with other parameters.
Implement the common code for importing dma-buf object and mapping dma-buf
pages.
Link: https://lore.kernel.org/r/1608067636-98073-2-git-send-email-jianxin.xiong@intel.com
Signed-off-by: Jianxin Xiong <jianxin.xiong@intel.com>
Reviewed-by: Sean Hefty <sean.hefty@intel.com>
Acked-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Acked-by: Christian Koenig <christian.koenig@amd.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Diffstat (limited to 'drivers/infiniband/core/umem.c')
| -rw-r--r-- | drivers/infiniband/core/umem.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c index 917338db7ac1..2dde99a9ba07 100644 --- a/drivers/infiniband/core/umem.c +++ b/drivers/infiniband/core/umem.c @@ -2,6 +2,7 @@ * Copyright (c) 2005 Topspin Communications. All rights reserved. * Copyright (c) 2005 Cisco Systems. All rights reserved. * Copyright (c) 2005 Mellanox Technologies. All rights reserved. + * Copyright (c) 2020 Intel Corporation. All rights reserved. * * This software is available to you under a choice of one of two * licenses. You may choose to be licensed under the terms of the GNU @@ -278,6 +279,8 @@ void ib_umem_release(struct ib_umem *umem) { if (!umem) return; + if (umem->is_dmabuf) + return ib_umem_dmabuf_release(to_ib_umem_dmabuf(umem)); if (umem->is_odp) return ib_umem_odp_release(to_ib_umem_odp(umem)); |