linux-kernel - [RFC PATCH 8/8 v2] IB/mlx5/hmm: enable ODP using HMM v2.

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Date:	Thu, 13 Aug 2015 15:20:53 -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: [RFC PATCH 8/8 v2] IB/mlx5/hmm: enable ODP using HMM v2.

All pieces are in place for ODP (on demand paging) to work using HMM.
Add kernel option and final code to enable it.

Changed since v1:
  - Added kernel option in this last patch of the serie.

Signed-off-by: Jérôme Glisse <jglisse@...hat.com>
---
 drivers/infiniband/Kconfig           | 10 ++++++++++
 drivers/infiniband/core/uverbs_cmd.c |  3 ---
 drivers/infiniband/hw/mlx5/main.c    |  4 ++++
 3 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/infiniband/Kconfig b/drivers/infiniband/Kconfig
index b899531..764f524 100644
--- a/drivers/infiniband/Kconfig
+++ b/drivers/infiniband/Kconfig
@@ -49,6 +49,16 @@ config INFINIBAND_ON_DEMAND_PAGING
 	  memory regions without pinning their pages, fetching the
 	  pages on demand instead.
 
+config INFINIBAND_ON_DEMAND_PAGING_HMM
+	bool "InfiniBand on-demand paging support using HMM."
+	depends on HMM
+	depends on INFINIBAND_ON_DEMAND_PAGING
+	default n
+	---help---
+	  Use HMM (heterogeneous memory management) kernel API for
+	  on demand paging. No userspace difference, this is just
+	  an alternative implementation of the feature.
+
 config INFINIBAND_ADDR_TRANS
 	bool
 	depends on INFINIBAND
diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c
index 1db6a17..c3e14a8 100644
--- a/drivers/infiniband/core/uverbs_cmd.c
+++ b/drivers/infiniband/core/uverbs_cmd.c
@@ -3445,8 +3445,6 @@ int ib_uverbs_ex_query_device(struct ib_uverbs_file *file,
 		goto end;
 
 #if IS_ENABLED(CONFIG_INFINIBAND_ON_DEMAND_PAGING)
-#if IS_ENABLED(CONFIG_INFINIBAND_ON_DEMAND_PAGING_HMM)
-#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 +3453,6 @@ 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 32ed2f1..c340c3a 100644
--- a/drivers/infiniband/hw/mlx5/main.c
+++ b/drivers/infiniband/hw/mlx5/main.c
@@ -295,6 +295,10 @@ static int mlx5_ib_query_device(struct ib_device *ibdev,
 
 #if IS_ENABLED(CONFIG_INFINIBAND_ON_DEMAND_PAGING)
 #if IS_ENABLED(CONFIG_INFINIBAND_ON_DEMAND_PAGING_HMM)
+	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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