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| author | Zhu Yanjun <yanjun.zhu@linux.dev> | 2023-02-17 09:14:25 +0800 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@nvidia.com> | 2023-02-17 16:36:14 -0400 |
| commit | d2225b838ccad126045e048471441693c7bca217 (patch) | |
| tree | efc994898c7c214eb8a48e05d89ca9dced51604b /drivers/infiniband | |
| parent | 5ef17179da7b779b3029d9a7d3871ba09279d56c (diff) | |
| download | linux-d2225b838ccad126045e048471441693c7bca217.tar.gz | |
RDMA/irdma: Add support for dmabuf pin memory regions
This is a followup to the EFA dmabuf[1]. Irdma driver currently does
not support on-demand-paging(ODP). So it uses habanalabs as the
dmabuf exporter, and irdma as the importer to allow for peer2peer
access through libibverbs.
In this commit, the function ib_umem_dmabuf_get_pinned() is used.
This function is introduced in EFA dmabuf[1] which allows the driver
to get a dmabuf umem which is pinned and does not require move_notify
callback implementation. The returned umem is pinned and DMA mapped
like standard cpu umems, and is released through ib_umem_release().
[1]https://lore.kernel.org/lkml/20211007114018.GD2688930@ziepe.ca/t/
Link: https://lore.kernel.org/r/20230217011425.498847-1-yanjun.zhu@intel.com
Reviewed-by: Shiraz Saleem <shiraz.saleem@intel.com>
Signed-off-by: Zhu Yanjun <yanjun.zhu@linux.dev>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Diffstat (limited to 'drivers/infiniband')
| -rw-r--r-- | drivers/infiniband/hw/irdma/verbs.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/irdma/verbs.c b/drivers/infiniband/hw/irdma/verbs.c index 6982f38596c8..1b2e3e800c9a 100644 --- a/drivers/infiniband/hw/irdma/verbs.c +++ b/drivers/infiniband/hw/irdma/verbs.c @@ -2977,6 +2977,47 @@ error: return ERR_PTR(err); } +static struct ib_mr *irdma_reg_user_mr_dmabuf(struct ib_pd *pd, u64 start, + u64 len, u64 virt, + int fd, int access, + struct ib_udata *udata) +{ + struct irdma_device *iwdev = to_iwdev(pd->device); + struct ib_umem_dmabuf *umem_dmabuf; + struct irdma_mr *iwmr; + int err; + + if (len > iwdev->rf->sc_dev.hw_attrs.max_mr_size) + return ERR_PTR(-EINVAL); + + umem_dmabuf = ib_umem_dmabuf_get_pinned(pd->device, start, len, fd, access); + if (IS_ERR(umem_dmabuf)) { + err = PTR_ERR(umem_dmabuf); + ibdev_dbg(&iwdev->ibdev, "Failed to get dmabuf umem[%d]\n", err); + return ERR_PTR(err); + } + + iwmr = irdma_alloc_iwmr(&umem_dmabuf->umem, pd, virt, IRDMA_MEMREG_TYPE_MEM); + if (IS_ERR(iwmr)) { + err = PTR_ERR(iwmr); + goto err_release; + } + + err = irdma_reg_user_mr_type_mem(iwmr, access); + if (err) + goto err_iwmr; + + return &iwmr->ibmr; + +err_iwmr: + irdma_free_iwmr(iwmr); + +err_release: + ib_umem_release(&umem_dmabuf->umem); + + return ERR_PTR(err); +} + /** * irdma_reg_phys_mr - register kernel physical memory * @pd: ibpd pointer @@ -4483,6 +4524,7 @@ static const struct ib_device_ops irdma_dev_ops = { .query_port = irdma_query_port, .query_qp = irdma_query_qp, .reg_user_mr = irdma_reg_user_mr, + .reg_user_mr_dmabuf = irdma_reg_user_mr_dmabuf, .req_notify_cq = irdma_req_notify_cq, .resize_cq = irdma_resize_cq, INIT_RDMA_OBJ_SIZE(ib_pd, irdma_pd, ibpd), |