linux-kernel - [PATCH v4 3/3] RDMA/umem: add support for P2P RDMA

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Message-Id: <20240708165714.3401377-4-martin.oliveira@eideticom.com>
Date: Mon,  8 Jul 2024 10:57:14 -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 v4 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