linux-kernel - [PATCH 8/8] IB/mlx5/hmm: enable ODP using HMM.

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Date:	Fri, 17 Jul 2015 15:01:05 -0400
From:	Jérôme Glisse <jglisse@...hat.com>
To:	<linux-kernel@...r.kernel.org>, <linux-rdma@...r.kernel.org>
Cc:	Christophe Harle <charle@...dia.com>,
	Duncan Poole <dpoole@...dia.com>,
	Sherry Cheung <SCheung@...dia.com>,
	Subhash Gutti <sgutti@...dia.com>,
	John Hubbard <jhubbard@...dia.com>,
	Mark Hairgrove <mhairgrove@...dia.com>,
	Lucien Dunning <ldunning@...dia.com>,
	Cameron Buschardt <cabuschardt@...dia.com>,
	Arvind Gopalakrishnan <arvindg@...dia.com>,
	Haggai Eran <haggaie@...lanox.com>,
	Shachar Raindel <raindel@...lanox.com>,
	Liran Liss <liranl@...lanox.com>,
	Jérôme Glisse <jglisse@...hat.com>
Subject: [PATCH 8/8] IB/mlx5/hmm: enable ODP using HMM.

All pieces are in place for ODP (on demand paging) to work using HMM.

Signed-off-by: Jérôme Glisse <jglisse@...hat.com>
---
 drivers/infiniband/core/uverbs_cmd.c | 4 ----
 drivers/infiniband/hw/mlx5/main.c    | 5 ++++-
 2 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c
index 165c9cd..c5c9bf0 100644
--- a/drivers/infiniband/core/uverbs_cmd.c
+++ b/drivers/infiniband/core/uverbs_cmd.c
@@ -3444,9 +3444,6 @@ int ib_uverbs_ex_query_device(struct ib_uverbs_file *file,
 		goto end;
 
 #ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
-#ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING_HMM
-#error "CONFIG_INFINIBAND_ON_DEMAND_PAGING_HMM not supported at this stage !"
-#else /* CONFIG_INFINIBAND_ON_DEMAND_PAGING_HMM */
 	resp.odp_caps.general_caps = attr.odp_caps.general_caps;
 	resp.odp_caps.per_transport_caps.rc_odp_caps =
 		attr.odp_caps.per_transport_caps.rc_odp_caps;
@@ -3455,7 +3452,6 @@ int ib_uverbs_ex_query_device(struct ib_uverbs_file *file,
 	resp.odp_caps.per_transport_caps.ud_odp_caps =
 		attr.odp_caps.per_transport_caps.ud_odp_caps;
 	resp.odp_caps.reserved = 0;
-#endif /* CONFIG_INFINIBAND_ON_DEMAND_PAGING_HMM */
 #else /* CONFIG_INFINIBAND_ON_DEMAND_PAGING */
 	memset(&resp.odp_caps, 0, sizeof(resp.odp_caps));
 #endif /* CONFIG_INFINIBAND_ON_DEMAND_PAGING */
diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c
index b731d06..1ba31d4 100644
--- a/drivers/infiniband/hw/mlx5/main.c
+++ b/drivers/infiniband/hw/mlx5/main.c
@@ -295,7 +295,10 @@ static int mlx5_ib_query_device(struct ib_device *ibdev,
 
 #ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
 #ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING_HMM
-#error "CONFIG_INFINIBAND_ON_DEMAND_PAGING_HMM not supported at this stage !"
+	if (MLX5_CAP_GEN(mdev, pg) && ibdev->hmm_ready) {
+		props->device_cap_flags |= IB_DEVICE_ON_DEMAND_PAGING;
+		props->odp_caps = dev->odp_caps;
+	}
 #else /* CONFIG_INFINIBAND_ON_DEMAND_PAGING_HMM */
 	if (MLX5_CAP_GEN(mdev, pg))
 		props->device_cap_flags |= IB_DEVICE_ON_DEMAND_PAGING;
-- 
1.9.3

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