vdpa/mlx5: Move mr mutex out of mr struct

The mutex is named like it is supposed to protect only the mkey but in
reality it is a global lock for all mr resources.

Shift the mutex to it's rightful location (struct mlx5_vdpa_dev) and
give it a more appropriate name.
Signed-off-by: Dragos Tatulea <dtatulea@nvidia.com>
Acked-by: Eugenio Pérez <eperezma@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20231018171456.1624030-13-dtatulea@nvidia.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Si-Wei Liu <si-wei.liu@oracle.com>
Tested-by: Si-Wei Liu <si-wei.liu@oracle.com>
Tested-by: Lei Yang <leiyang@redhat.com>

drivers/vdpa/mlx5/core/mlx5_vdpa.h

@@ -34,8 +34,6 @@ struct mlx5_vdpa_mr {
 	/* state of dvq mr */
 	bool initialized;
 
-	/* serialize mkey creation and destruction */
-	struct mutex mkey_mtx;
 	bool user_mr;
 };
 
@@ -94,6 +92,8 @@ struct mlx5_vdpa_dev {
 	u32 generation;
 
 	struct mlx5_vdpa_mr mr;
+	/* serialize mr access */
+	struct mutex mr_mtx;
 	struct mlx5_control_vq cvq;
 	struct workqueue_struct *wq;
 	unsigned int group2asid[MLX5_VDPA_NUMVQ_GROUPS];

drivers/vdpa/mlx5/core/mr.c

@@ -509,11 +509,11 @@ static void _mlx5_vdpa_destroy_mr(struct mlx5_vdpa_dev *mvdev, struct mlx5_vdpa_
 void mlx5_vdpa_destroy_mr(struct mlx5_vdpa_dev *mvdev,
 			  struct mlx5_vdpa_mr *mr)
 {
-	mutex_lock(&mr->mkey_mtx);
+	mutex_lock(&mvdev->mr_mtx);
 
 	_mlx5_vdpa_destroy_mr(mvdev, mr);
 
-	mutex_unlock(&mr->mkey_mtx);
+	mutex_unlock(&mvdev->mr_mtx);
 }
 
 void mlx5_vdpa_destroy_mr_resources(struct mlx5_vdpa_dev *mvdev)
@@ -550,9 +550,10 @@ int mlx5_vdpa_create_mr(struct mlx5_vdpa_dev *mvdev,
 {
 	int err;
 
-	mutex_lock(&mvdev->mr.mkey_mtx);
+	mutex_lock(&mvdev->mr_mtx);
 	err = _mlx5_vdpa_create_mr(mvdev, mr, iotlb);
-	mutex_unlock(&mvdev->mr.mkey_mtx);
+	mutex_unlock(&mvdev->mr_mtx);
+
 	return err;
 }
 
@@ -563,14 +564,14 @@ int mlx5_vdpa_handle_set_map(struct mlx5_vdpa_dev *mvdev, struct vhost_iotlb *io
 	int err = 0;
 
 	*change_map = false;
-	mutex_lock(&mr->mkey_mtx);
+	mutex_lock(&mvdev->mr_mtx);
 	if (mr->initialized) {
 		mlx5_vdpa_info(mvdev, "memory map update\n");
 		*change_map = true;
 	}
 	if (!*change_map)
 		err = _mlx5_vdpa_create_mr(mvdev, mr, iotlb);
-	mutex_unlock(&mr->mkey_mtx);
+	mutex_unlock(&mvdev->mr_mtx);
 
 	return err;
 }

drivers/vdpa/mlx5/core/resources.c

@@ -256,7 +256,7 @@ int mlx5_vdpa_alloc_resources(struct mlx5_vdpa_dev *mvdev)
 		mlx5_vdpa_warn(mvdev, "resources already allocated\n");
 		return -EINVAL;
 	}
-	mutex_init(&mvdev->mr.mkey_mtx);
+	mutex_init(&mvdev->mr_mtx);
 	res->uar = mlx5_get_uars_page(mdev);
 	if (IS_ERR(res->uar)) {
 		err = PTR_ERR(res->uar);
@@ -301,7 +301,7 @@ int mlx5_vdpa_alloc_resources(struct mlx5_vdpa_dev *mvdev)
 err_uctx:
 	mlx5_put_uars_page(mdev, res->uar);
 err_uars:
-	mutex_destroy(&mvdev->mr.mkey_mtx);
+	mutex_destroy(&mvdev->mr_mtx);
 	return err;
 }
 
@@ -318,6 +318,6 @@ void mlx5_vdpa_free_resources(struct mlx5_vdpa_dev *mvdev)
 	dealloc_pd(mvdev, res->pdn, res->uid);
 	destroy_uctx(mvdev, res->uid);
 	mlx5_put_uars_page(mvdev->mdev, res->uar);
-	mutex_destroy(&mvdev->mr.mkey_mtx);
+	mutex_destroy(&mvdev->mr_mtx);
 	res->valid = false;
 }