2023-09-12 14:28:44

by Dragos Tatulea

Subject: [PATCH 06/16] vdpa/mlx5: Take cvq iotlb lock during refresh

The reslock is taken while refresh is called but iommu_lock is more
specific to this resource. So take the iommu_lock during cvq iotlb
refresh.

Based on Eugenio's patch [0].

[0] https://lore.kernel.org/lkml/[email protected]/

Suggested-by: Eugenio Pérez <[email protected]>
Signed-off-by: Dragos Tatulea <[email protected]>
---
drivers/vdpa/mlx5/core/mr.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/vdpa/mlx5/core/mr.c b/drivers/vdpa/mlx5/core/mr.c
index fcb6ae32e9ed..587300e7c18e 100644
--- a/drivers/vdpa/mlx5/core/mr.c
+++ b/drivers/vdpa/mlx5/core/mr.c
@@ -590,11 +590,19 @@ int mlx5_vdpa_update_cvq_iotlb(struct mlx5_vdpa_dev *mvdev,
struct vhost_iotlb *iotlb,
unsigned int asid)
{
+ int err;
+
if (mvdev->group2asid[MLX5_VDPA_CVQ_GROUP] != asid)
return 0;

+ spin_lock(&mvdev->cvq.iommu_lock);
+
prune_iotlb(mvdev);
- return dup_iotlb(mvdev, iotlb);
+ err = dup_iotlb(mvdev, iotlb);
+
+ spin_unlock(&mvdev->cvq.iommu_lock);
+
+ return err;
}

int mlx5_vdpa_create_dma_mr(struct mlx5_vdpa_dev *mvdev)
--
2.41.0

2023-09-26 23:01:09

by Jason Wang

Subject: Re: [PATCH 06/16] vdpa/mlx5: Take cvq iotlb lock during refresh

On Tue, Sep 12, 2023 at 9:02 PM Dragos Tatulea <[email protected]> wrote:
>
> The reslock is taken while refresh is called but iommu_lock is more
> specific to this resource. So take the iommu_lock during cvq iotlb
> refresh.
>
> Based on Eugenio's patch [0].
>
> [0] https://lore.kernel.org/lkml/[email protected]/
>
> Suggested-by: Eugenio Pérez <[email protected]>
> Signed-off-by: Dragos Tatulea <[email protected]>

Acked-by: Jason Wang <[email protected]>

Thanks

> ---
> drivers/vdpa/mlx5/core/mr.c | 10 +++++++++-
> 1 file changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/vdpa/mlx5/core/mr.c b/drivers/vdpa/mlx5/core/mr.c
> index fcb6ae32e9ed..587300e7c18e 100644
> --- a/drivers/vdpa/mlx5/core/mr.c
> +++ b/drivers/vdpa/mlx5/core/mr.c
> @@ -590,11 +590,19 @@ int mlx5_vdpa_update_cvq_iotlb(struct mlx5_vdpa_dev *mvdev,
> struct vhost_iotlb *iotlb,
> unsigned int asid)
> {
> + int err;
> +
> if (mvdev->group2asid[MLX5_VDPA_CVQ_GROUP] != asid)
> return 0;
>
> + spin_lock(&mvdev->cvq.iommu_lock);
> +
> prune_iotlb(mvdev);
> - return dup_iotlb(mvdev, iotlb);
> + err = dup_iotlb(mvdev, iotlb);
> +
> + spin_unlock(&mvdev->cvq.iommu_lock);
> +
> + return err;
> }
>
> int mlx5_vdpa_create_dma_mr(struct mlx5_vdpa_dev *mvdev)
> --
> 2.41.0
>