linux-kernel - Re: [PATCH rc 7/8] iommu/vt-d: Wrap the dirty tracking loop to be a helper

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Message-ID: <63070cc2-3dee-4da8-a76d-0e4a54eafff5@oracle.com>
Date: Thu, 8 Feb 2024 10:29:09 +0000
From: Joao Martins <joao.m.martins@...cle.com>
To: Yi Liu <yi.l.liu@...el.com>, joro@...tes.org, jgg@...dia.com,
        kevin.tian@...el.com, baolu.lu@...ux.intel.com
Cc: alex.williamson@...hat.com, robin.murphy@....com, eric.auger@...hat.com,
        nicolinc@...dia.com, kvm@...r.kernel.org, chao.p.peng@...ux.intel.com,
        yi.y.sun@...ux.intel.com, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        zhenzhong.duan@...el.com
Subject: Re: [PATCH rc 7/8] iommu/vt-d: Wrap the dirty tracking loop to be a
 helper

On 08/02/2024 08:23, Yi Liu wrote:
> Add device_set_dirty_tracking() to loop all the devices and set the dirty
> tracking per the @enable parameter.
> 
> Signed-off-by: Yi Liu <yi.l.liu@...el.com>

Nice cleanup,

Reviewed-by: Joao Martins <joao.m.martins@...cle.com>

> ---
>  drivers/iommu/intel/iommu.c | 32 +++++++++++++++++++++-----------
>  1 file changed, 21 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
> index dae20991e036..7636d3f03905 100644
> --- a/drivers/iommu/intel/iommu.c
> +++ b/drivers/iommu/intel/iommu.c
> @@ -4730,23 +4730,35 @@ static void *intel_iommu_hw_info(struct device *dev, u32 *length, u32 *type)
>  	return vtd;
>  }
>  
> +static int
> +device_set_dirty_tracking(struct list_head *devices, bool enable)
> +{
> +	struct device_domain_info *info;
> +	int ret = 0;
> +
> +	list_for_each_entry(info, devices, link) {
> +		ret = intel_pasid_setup_dirty_tracking(info->iommu, info->dev,
> +						       IOMMU_NO_PASID, enable);
> +		if (ret)
> +			break;
> +	}
> +
> +	return ret;
> +}
> +
>  static int intel_iommu_set_dirty_tracking(struct iommu_domain *domain,
>  					  bool enable)
>  {
>  	struct dmar_domain *dmar_domain = to_dmar_domain(domain);
> -	struct device_domain_info *info;
>  	int ret;
>  
>  	spin_lock(&dmar_domain->lock);
>  	if (dmar_domain->dirty_tracking == enable)
>  		goto out_unlock;
>  
> -	list_for_each_entry(info, &dmar_domain->devices, link) {
> -		ret = intel_pasid_setup_dirty_tracking(info->iommu, info->dev,
> -						       IOMMU_NO_PASID, enable);
> -		if (ret)
> -			goto err_unwind;
> -	}
> +	ret = device_set_dirty_tracking(&dmar_domain->devices, enable);
> +	if (ret)
> +		goto err_unwind;
>  
>  	dmar_domain->dirty_tracking = enable;
>  out_unlock:
> @@ -4755,10 +4767,8 @@ static int intel_iommu_set_dirty_tracking(struct iommu_domain *domain,
>  	return 0;
>  
>  err_unwind:
> -	list_for_each_entry(info, &dmar_domain->devices, link)
> -		intel_pasid_setup_dirty_tracking(info->iommu, info->dev,
> -						 IOMMU_NO_PASID,
> -						 dmar_domain->dirty_tracking);
> +	device_set_dirty_tracking(&dmar_domain->devices,
> +				  dmar_domain->dirty_tracking);
>  	spin_unlock(&dmar_domain->lock);
>  	return ret;
>  }