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Message-Id: <20240605192934.742369-7-martin.oliveira@eideticom.com>
Date: Wed, 5 Jun 2024 13:29:34 -0600
From: Martin Oliveira <martin.oliveira@...eticom.com>
To: linux-rdma@...r.kernel.org,
linux-kernel@...r.kernel.org,
linux-pci@...r.kernel.org,
linux-mm@...ck.org
Cc: Jason Gunthorpe <jgg@...pe.ca>,
Leon Romanovsky <leon@...nel.org>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Logan Gunthorpe <logang@...tatee.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Tejun Heo <tj@...nel.org>,
"Rafael J. Wysocki" <rafael@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Mike Marciniszyn <mike.marciniszyn@...el.com>,
Michael Guralnik <michaelgur@...dia.com>,
Martin Oliveira <martin.oliveira@...eticom.com>,
Dan Williams <dan.j.williams@...el.com>,
Ard Biesheuvel <ardb@...nel.org>,
Valentine Sinitsyn <valesini@...dex-team.ru>,
Lukas Wunner <lukas@...ner.de>
Subject: [PATCH 6/6] 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>
---
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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