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

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Message-ID: <20241201103659.420677-6-ymaman@nvidia.com>
Date: Sun, 1 Dec 2024 12:36:59 +0200
From: Yonatan Maman <ymaman@...dia.com>
To: <kherbst@...hat.com>, <lyude@...hat.com>, <dakr@...hat.com>,
	<airlied@...il.com>, <simona@...ll.ch>, <jgg@...pe.ca>, <leon@...nel.org>,
	<jglisse@...hat.com>, <akpm@...ux-foundation.org>, <Ymaman@...dia.com>,
	<GalShalom@...dia.com>, <dri-devel@...ts.freedesktop.org>,
	<nouveau@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
	<linux-rdma@...r.kernel.org>, <linux-mm@...ck.org>,
	<linux-tegra@...r.kernel.org>
Subject: [RFC 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 1bae5595c729..702d155f5048 100644
--- a/drivers/infiniband/hw/mlx5/mlx5_ib.h
+++ b/drivers/infiniband/hw/mlx5/mlx5_ib.h
@@ -1705,9 +1705,9 @@ 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