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From: Martin Oliveira <martin.oliveira@eideticom.com>
To: linux-rdma@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	linux-mm@kvack.org
Cc: Jason Gunthorpe <jgg@ziepe.ca>,
	Leon Romanovsky <leon@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Tejun Heo <tj@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Logan Gunthorpe <logang@deltatee.com>,
	Martin Oliveira <martin.oliveira@eideticom.com>,
	Mike Marciniszyn <mike.marciniszyn@intel.com>,
	Shiraz Saleem <shiraz.saleem@intel.com>,
	Michael Guralnik <michaelgur@nvidia.com>,
	Artemy Kovalyov <artemyko@nvidia.com>,
	Jason Gunthorpe <jgg@nvidia.com>
Subject: [PATCH v2 4/4] RDMA/umem: add support for P2P RDMA
Date: Tue, 11 Jun 2024 12:27:32 -0600
Message-ID: <20240611182732.360317-5-martin.oliveira@eideticom.com>
In-Reply-To: <20240611182732.360317-1-martin.oliveira@eideticom.com>
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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@deltatee.com>
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Martin Oliveira <martin.oliveira@eideticom.com>
Acked-by: Jason Gunthorpe <jgg@nvidia.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 07c571c7b6999..b59bb6e1475e2 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,
-- 
2.43.0