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RDMA/irdma: Add support for dmabuf pin memory regions

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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>
This commit is contained in:
Zhu Yanjun 2023-02-17 09:14:25 +08:00 committed by Jason Gunthorpe
parent 5ef17179da
commit d2225b838c
1 changed files with 42 additions and 0 deletions
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42
drivers/infiniband/hw/irdma/verbs.c
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@ -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),