[PATCH vhost v3 15/16] vdpa/mlx5: Make iotlb helper functions more generic

[Dragos Tatulea via Virtualization]

They will be used in a follow-up patch.

For dup_iotlb, avoid the src == dst case. This is an error.

Acked-by: Eugenio Pérez <epere...@redhat.com>
Signed-off-by: Dragos Tatulea <dtatu...@nvidia.com>
---
 drivers/vdpa/mlx5/core/mr.c | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/drivers/vdpa/mlx5/core/mr.c b/drivers/vdpa/mlx5/core/mr.c
index 3dee6d9bed6b..4a3df865df40 100644
--- a/drivers/vdpa/mlx5/core/mr.c
+++ b/drivers/vdpa/mlx5/core/mr.c
@@ -454,20 +454,23 @@ static void destroy_dma_mr(struct mlx5_vdpa_dev *mvdev, 
struct mlx5_vdpa_mr *mr)
        mlx5_vdpa_destroy_mkey(mvdev, mr->mkey);
 }
 
-static int dup_iotlb(struct mlx5_vdpa_dev *mvdev, struct vhost_iotlb *src)
+static int dup_iotlb(struct vhost_iotlb *dst, struct vhost_iotlb *src)
 {
        struct vhost_iotlb_map *map;
        u64 start = 0, last = ULLONG_MAX;
        int err;
 
+       if (dst == src)
+               return -EINVAL;
+
        if (!src) {
-               err = vhost_iotlb_add_range(mvdev->cvq.iotlb, start, last, 
start, VHOST_ACCESS_RW);
+               err = vhost_iotlb_add_range(dst, start, last, start, 
VHOST_ACCESS_RW);
                return err;
        }
 
        for (map = vhost_iotlb_itree_first(src, start, last); map;
                map = vhost_iotlb_itree_next(map, start, last)) {
-               err = vhost_iotlb_add_range(mvdev->cvq.iotlb, map->start, 
map->last,
+               err = vhost_iotlb_add_range(dst, map->start, map->last,
                                            map->addr, map->perm);
                if (err)
                        return err;
@@ -475,9 +478,9 @@ static int dup_iotlb(struct mlx5_vdpa_dev *mvdev, struct 
vhost_iotlb *src)
        return 0;
 }
 
-static void prune_iotlb(struct mlx5_vdpa_dev *mvdev)
+static void prune_iotlb(struct vhost_iotlb *iotlb)
 {
-       vhost_iotlb_del_range(mvdev->cvq.iotlb, 0, ULLONG_MAX);
+       vhost_iotlb_del_range(iotlb, 0, ULLONG_MAX);
 }
 
 static void destroy_user_mr(struct mlx5_vdpa_dev *mvdev, struct mlx5_vdpa_mr 
*mr)
@@ -544,7 +547,7 @@ void mlx5_vdpa_destroy_mr_resources(struct mlx5_vdpa_dev 
*mvdev)
        for (int i = 0; i < MLX5_VDPA_NUM_AS; i++)
                mlx5_vdpa_destroy_mr(mvdev, mvdev->mr[i]);
 
-       prune_iotlb(mvdev);
+       prune_iotlb(mvdev->cvq.iotlb);
 }
 
 static int _mlx5_vdpa_create_mr(struct mlx5_vdpa_dev *mvdev,
@@ -596,8 +599,8 @@ int mlx5_vdpa_update_cvq_iotlb(struct mlx5_vdpa_dev *mvdev,
 
        spin_lock(&mvdev->cvq.iommu_lock);
 
-       prune_iotlb(mvdev);
-       err = dup_iotlb(mvdev, iotlb);
+       prune_iotlb(mvdev->cvq.iotlb);
+       err = dup_iotlb(mvdev->cvq.iotlb, iotlb);
 
        spin_unlock(&mvdev->cvq.iommu_lock);
 
-- 
2.41.0

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