IB/mlx5: Page faults handling infrastructure

* Refactor MR registration and cleanup, and fix reg_pages accounting.
* Create a work queue to handle page fault events in a kthread context.
* Register a fault handler to get events from the core for each QP.

The registered fault handler is empty in this patch, and only a later
patch implements it.

Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Shachar Raindel <raindel@mellanox.com>
Signed-off-by: Haggai Eran <haggaie@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/linux/mlx5/driver.h b/include/linux/mlx5/driver.h
index 7088dcd19214..166d9315fe4b 100644
--- a/include/linux/mlx5/driver.h
+++ b/include/linux/mlx5/driver.h
@@ -474,7 +474,7 @@ struct mlx5_priv {
         struct workqueue_struct *pg_wq;
         struct rb_root          page_root;
         int                     fw_pages;
-        int                     reg_pages;
+        atomic_t                reg_pages;
         struct list_head        free_list;
 
         struct mlx5_core_health health;