IB/uverbs: Have the core code create the uverbs_root_spec

There is no reason for drivers to do this, the core code should take of
everything. The drivers will provide their information from rodata to
describe their modifications to the core's base uapi specification.

The core uses this to build up the runtime uapi for each device.

Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>

drivers/infiniband/hw/mlx5/main.c

@@ -5523,37 +5523,29 @@ ADD_UVERBS_ATTRIBUTES_SIMPLE(
 	UVERBS_ATTR_FLAGS_IN(MLX5_IB_ATTR_CREATE_FLOW_ACTION_FLAGS,
 			     enum mlx5_ib_uapi_flow_action_flags));
 
-#define NUM_TREES	5
 static int populate_specs_root(struct mlx5_ib_dev *dev)
 {
-	const struct uverbs_object_tree_def *default_root[NUM_TREES + 1] = {
-		uverbs_default_get_objects()};
-	size_t num_trees = 1;
+	const struct uverbs_object_tree_def **trees = dev->driver_trees;
+	size_t num_trees = 0;
 
-	if (mlx5_accel_ipsec_device_caps(dev->mdev) & MLX5_ACCEL_IPSEC_CAP_DEVICE &&
-	    !WARN_ON(num_trees >= ARRAY_SIZE(default_root)))
-		default_root[num_trees++] = &mlx5_ib_flow_action;
+	if (mlx5_accel_ipsec_device_caps(dev->mdev) &
+	    MLX5_ACCEL_IPSEC_CAP_DEVICE)
+		trees[num_trees++] = &mlx5_ib_flow_action;
 
-	if (MLX5_CAP_DEV_MEM(dev->mdev, memic) &&
-	    !WARN_ON(num_trees >= ARRAY_SIZE(default_root)))
-		default_root[num_trees++] = &mlx5_ib_dm;
+	if (MLX5_CAP_DEV_MEM(dev->mdev, memic))
+		trees[num_trees++] = &mlx5_ib_dm;
 
 	if (MLX5_CAP_GEN_64(dev->mdev, general_obj_types) &
-			    MLX5_GENERAL_OBJ_TYPES_CAP_UCTX &&
-	    !WARN_ON(num_trees >= ARRAY_SIZE(default_root)))
-		default_root[num_trees++] = mlx5_ib_get_devx_tree();
+	    MLX5_GENERAL_OBJ_TYPES_CAP_UCTX)
+		trees[num_trees++] = mlx5_ib_get_devx_tree();
 
-	num_trees += mlx5_ib_get_flow_trees(default_root + num_trees);
+	num_trees += mlx5_ib_get_flow_trees(trees + num_trees);
 
-	dev->ib_dev.driver_specs_root =
-		uverbs_alloc_spec_tree(num_trees, default_root);
+	WARN_ON(num_trees >= ARRAY_SIZE(dev->driver_trees));
+	trees[num_trees] = NULL;
+	dev->ib_dev.driver_specs = trees;
 
-	return PTR_ERR_OR_ZERO(dev->ib_dev.driver_specs_root);
-}
-
-static void depopulate_specs_root(struct mlx5_ib_dev *dev)
-{
-	uverbs_free_spec_tree(dev->ib_dev.driver_specs_root);
+	return 0;
 }
 
 static int mlx5_ib_read_counters(struct ib_counters *counters,
@@ -6092,11 +6084,6 @@ int mlx5_ib_stage_ib_reg_init(struct mlx5_ib_dev *dev)
 	return ib_register_device(&dev->ib_dev, NULL);
 }
 
-static void mlx5_ib_stage_depopulate_specs(struct mlx5_ib_dev *dev)
-{
-	depopulate_specs_root(dev);
-}
-
 void mlx5_ib_stage_pre_ib_reg_umr_cleanup(struct mlx5_ib_dev *dev)
 {
 	destroy_umrc_res(dev);
@@ -6231,7 +6218,7 @@ static const struct mlx5_ib_profile pf_profile = {
 		     mlx5_ib_stage_pre_ib_reg_umr_cleanup),
 	STAGE_CREATE(MLX5_IB_STAGE_SPECS,
 		     mlx5_ib_stage_populate_specs,
-		     mlx5_ib_stage_depopulate_specs),
+		     NULL),
 	STAGE_CREATE(MLX5_IB_STAGE_IB_REG,
 		     mlx5_ib_stage_ib_reg_init,
 		     mlx5_ib_stage_ib_reg_cleanup),
@@ -6279,7 +6266,7 @@ static const struct mlx5_ib_profile nic_rep_profile = {
 		     mlx5_ib_stage_pre_ib_reg_umr_cleanup),
 	STAGE_CREATE(MLX5_IB_STAGE_SPECS,
 		     mlx5_ib_stage_populate_specs,
-		     mlx5_ib_stage_depopulate_specs),
+		     NULL),
 	STAGE_CREATE(MLX5_IB_STAGE_IB_REG,
 		     mlx5_ib_stage_ib_reg_init,
 		     mlx5_ib_stage_ib_reg_cleanup),

drivers/infiniband/hw/mlx5/mlx5_ib.h

@@ -860,6 +860,7 @@ to_mcounters(struct ib_counters *ibcntrs)
 
 struct mlx5_ib_dev {
 	struct ib_device		ib_dev;
+	const struct uverbs_object_tree_def *driver_trees[6];
 	struct mlx5_core_dev		*mdev;
 	struct mlx5_roce		roce[MLX5_MAX_PORTS];
 	int				num_ports;