net/mlx5: Add pages debugfs

Add pages debugfs to expose the following counters for debuggability:
fw_pages_total - How many pages were given to FW and not returned yet.
vfs_pages - For SRIOV, how many pages were given to FW for virtual
functions usage.
host_pf_pages - For ECPF, how many pages were given to FW for external
hosts physical functions usage.
Signed-off-by: Moshe Shemesh <moshe@nvidia.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

drivers/net/ethernet/mellanox/mlx5/core/debugfs.c

@@ -212,6 +212,23 @@ void mlx5_cq_debugfs_cleanup(struct mlx5_core_dev *dev)
 	debugfs_remove_recursive(dev->priv.dbg.cq_debugfs);
 }
 
+void mlx5_pages_debugfs_init(struct mlx5_core_dev *dev)
+{
+	struct dentry *pages;
+
+	dev->priv.dbg.pages_debugfs = debugfs_create_dir("pages", dev->priv.dbg.dbg_root);
+	pages = dev->priv.dbg.pages_debugfs;
+
+	debugfs_create_u32("fw_pages_total", 0400, pages, &dev->priv.fw_pages);
+	debugfs_create_u32("fw_pages_vfs", 0400, pages, &dev->priv.vfs_pages);
+	debugfs_create_u32("fw_pages_host_pf", 0400, pages, &dev->priv.host_pf_pages);
+}
+
+void mlx5_pages_debugfs_cleanup(struct mlx5_core_dev *dev)
+{
+	debugfs_remove_recursive(dev->priv.dbg.pages_debugfs);
+}
+
 static u64 qp_read_field(struct mlx5_core_dev *dev, struct mlx5_core_qp *qp,
 			 int index, int *is_str)
 {

drivers/net/ethernet/mellanox/mlx5/core/pagealloc.c

@@ -714,12 +714,14 @@ int mlx5_pagealloc_init(struct mlx5_core_dev *dev)
 		return -ENOMEM;
 
 	xa_init(&dev->priv.page_root_xa);
+	mlx5_pages_debugfs_init(dev);
 
 	return 0;
 }
 
 void mlx5_pagealloc_cleanup(struct mlx5_core_dev *dev)
 {
+	mlx5_pages_debugfs_cleanup(dev);
 	xa_destroy(&dev->priv.page_root_xa);
 	destroy_workqueue(dev->priv.pg_wq);
 }

include/linux/mlx5/driver.h

@@ -557,6 +557,7 @@ struct mlx5_debugfs_entries {
 	struct dentry *eq_debugfs;
 	struct dentry *cq_debugfs;
 	struct dentry *cmdif_debugfs;
+	struct dentry *pages_debugfs;
 };
 
 struct mlx5_ft_pool;
@@ -569,11 +570,11 @@ struct mlx5_priv {
 	struct mlx5_nb          pg_nb;
 	struct workqueue_struct *pg_wq;
 	struct xarray           page_root_xa;
-	int			fw_pages;
+	u32			fw_pages;
 	atomic_t		reg_pages;
 	struct list_head	free_list;
-	int			vfs_pages;
-	int			host_pf_pages;
+	u32			vfs_pages;
+	u32			host_pf_pages;
 
 	struct mlx5_core_health health;
 	struct list_head	traps;
@@ -1026,6 +1027,8 @@ int mlx5_pagealloc_init(struct mlx5_core_dev *dev);
 void mlx5_pagealloc_cleanup(struct mlx5_core_dev *dev);
 void mlx5_pagealloc_start(struct mlx5_core_dev *dev);
 void mlx5_pagealloc_stop(struct mlx5_core_dev *dev);
+void mlx5_pages_debugfs_init(struct mlx5_core_dev *dev);
+void mlx5_pages_debugfs_cleanup(struct mlx5_core_dev *dev);
 void mlx5_core_req_pages_handler(struct mlx5_core_dev *dev, u16 func_id,
 				 s32 npages, bool ec_function);
 int mlx5_satisfy_startup_pages(struct mlx5_core_dev *dev, int boot);