linux-kernel - Re: [PATCH vhost 15/16] vdpa/mlx5: Make iotlb helper functions more generic

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Message-ID: <CAJaqyWe2btM+8Hbnq9ROyh-bhQA5vVwNk9xgSHb_gFme9dJViw@mail.gmail.com>
Date:   Thu, 5 Oct 2023 12:14:30 +0200
From:   Eugenio Perez Martin <eperezma@...hat.com>
To:     Dragos Tatulea <dtatulea@...dia.com>
Cc:     gal@...dia.com, "Michael S . Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH vhost 15/16] vdpa/mlx5: Make iotlb helper functions more generic

On Thu, Sep 28, 2023 at 6:50 PM Dragos Tatulea <dtatulea@...dia.com> wrote:
>
> They will be used in a followup patch.
>
> Signed-off-by: Dragos Tatulea <dtatulea@...dia.com>
> ---
>  drivers/vdpa/mlx5/core/mr.c | 16 ++++++++--------
>  1 file changed, 8 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/vdpa/mlx5/core/mr.c b/drivers/vdpa/mlx5/core/mr.c
> index 3dee6d9bed6b..a4135c16b5bf 100644
> --- a/drivers/vdpa/mlx5/core/mr.c
> +++ b/drivers/vdpa/mlx5/core/mr.c
> @@ -454,20 +454,20 @@ 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 *iotlb, struct vhost_iotlb *src)

It would be great to move this patch to vhost/iotlb, especially
because it can be reused by vdpa_sim. But it can be done on top for
sure,

Acked-by: Eugenio Pérez <eperezma@...hat.com>

>  {
>         struct vhost_iotlb_map *map;
>         u64 start = 0, last = ULLONG_MAX;
>         int err;
>
>         if (!src) {
> -               err = vhost_iotlb_add_range(mvdev->cvq.iotlb, start, last, start, VHOST_ACCESS_RW);
> +               err = vhost_iotlb_add_range(iotlb, 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(iotlb, map->start, map->last,
>                                             map->addr, map->perm);
>                 if (err)
>                         return err;
> @@ -475,9 +475,9 @@ 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 +544,7 @@ 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 +596,8 @@ 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
>