linux-kernel - [PATCH v2 5/5] RDMA/mlx5: Enabling ATS for ODP memory

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Message-ID: <20250718115112.3881129-6-ymaman@nvidia.com>
Date: Fri, 18 Jul 2025 14:51:12 +0300
From: Yonatan Maman <ymaman@...dia.com>
To: Jérôme Glisse <jglisse@...hat.com>, Andrew Morton
	<akpm@...ux-foundation.org>, Jason Gunthorpe <jgg@...pe.ca>, Leon Romanovsky
	<leon@...nel.org>
CC: Lyude Paul <lyude@...hat.com>, Danilo Krummrich <dakr@...nel.org>, "David
 Airlie" <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, Alistair Popple
	<apopple@...dia.com>, Ben Skeggs <bskeggs@...dia.com>, Michael Guralnik
	<michaelgur@...dia.com>, Or Har-Toov <ohartoov@...dia.com>, Daisuke Matsuda
	<dskmtsd@...il.com>, Shay Drory <shayd@...dia.com>, <linux-mm@...ck.org>,
	<linux-rdma@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
	<nouveau@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>, "Yonatan
 Maman" <Ymaman@...dia.com>, Gal Shalom <GalShalom@...dia.com>
Subject: [PATCH v2 5/5] RDMA/mlx5: Enabling ATS for ODP memory

From: Yonatan Maman <Ymaman@...dia.com>

ATS (Address Translation Services) mainly utilized to optimize PCI
Peer-to-Peer transfers and prevent bus failures. This change employed
ATS usage for ODP memory, to optimize DMA P2P for ODP memory. (e.g DMA
P2P for private device pages - ODP memory).

Signed-off-by: Yonatan Maman <Ymaman@...dia.com>
Signed-off-by: Gal Shalom <GalShalom@...dia.com>
---
 drivers/infiniband/hw/mlx5/mlx5_ib.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/infiniband/hw/mlx5/mlx5_ib.h b/drivers/infiniband/hw/mlx5/mlx5_ib.h
index fde859d207ae..a7b7a565b7e8 100644
--- a/drivers/infiniband/hw/mlx5/mlx5_ib.h
+++ b/drivers/infiniband/hw/mlx5/mlx5_ib.h
@@ -1734,9 +1734,9 @@ static inline bool rt_supported(int ts_cap)
 static inline bool mlx5_umem_needs_ats(struct mlx5_ib_dev *dev,
 				       struct ib_umem *umem, int access_flags)
 {
-	if (!MLX5_CAP_GEN(dev->mdev, ats) || !umem->is_dmabuf)
-		return false;
-	return access_flags & IB_ACCESS_RELAXED_ORDERING;
+	if (MLX5_CAP_GEN(dev->mdev, ats) && (umem->is_dmabuf || umem->is_odp))
+		return access_flags & IB_ACCESS_RELAXED_ORDERING;
+	return false;
 }
 
 int set_roce_addr(struct mlx5_ib_dev *dev, u32 port_num,
-- 
2.34.1