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Message-Id: <20240704163724.2462161-4-martin.oliveira@eideticom.com>
Date: Thu, 4 Jul 2024 10:37:24 -0600
From: Martin Oliveira <martin.oliveira@...eticom.com>
To: linux-kernel@...r.kernel.org,
linux-mm@...ck.org,
linux-rdma@...r.kernel.org
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Artemy Kovalyov <artemyko@...dia.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Jason Gunthorpe <jgg@...pe.ca>,
Leon Romanovsky <leon@...nel.org>,
Logan Gunthorpe <logang@...tatee.com>,
Martin Oliveira <martin.oliveira@...eticom.com>,
Michael Guralnik <michaelgur@...dia.com>,
Mike Marciniszyn <mike.marciniszyn@...el.com>,
Shiraz Saleem <shiraz.saleem@...el.com>,
Tejun Heo <tj@...nel.org>,
John Hubbard <jhubbard@...dia.com>,
Dan Williams <dan.j.williams@...el.com>,
David Sloan <david.sloan@...eticom.com>,
Jason Gunthorpe <jgg@...dia.com>
Subject: [PATCH v3 3/3] RDMA/umem: add support for P2P RDMA
If the device supports P2PDMA, add the FOLL_PCI_P2PDMA flag
This allows ibv_reg_mr() and friends to use P2PDMA memory that has been
mmaped into userspace for MRs in IB and RDMA transactions.
Co-developed-by: Logan Gunthorpe <logang@...tatee.com>
Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
Signed-off-by: Martin Oliveira <martin.oliveira@...eticom.com>
Acked-by: Jason Gunthorpe <jgg@...dia.com>
---
drivers/infiniband/core/umem.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c
index 07c571c7b699..b59bb6e1475e 100644
--- a/drivers/infiniband/core/umem.c
+++ b/drivers/infiniband/core/umem.c
@@ -208,6 +208,9 @@ struct ib_umem *ib_umem_get(struct ib_device *device, unsigned long addr,
if (umem->writable)
gup_flags |= FOLL_WRITE;
+ if (ib_dma_pci_p2p_dma_supported(device))
+ gup_flags |= FOLL_PCI_P2PDMA;
+
while (npages) {
cond_resched();
pinned = pin_user_pages_fast(cur_base,
--
2.34.1
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