linux-kernel - Re: [PATCH v2 1/2] iommu/sva: Tighten SVA bind API with explicit flags

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Date:   Thu, 15 Apr 2021 07:40:33 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        iommu@...ts.linux-foundation.org, Joerg Roedel <joro@...tes.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Raj Ashok <ashok.raj@...el.com>, vkoul@...nel.org,
        Jason Gunthorpe <jgg@...dia.com>, zhangfei.gao@...aro.org
Subject: Re: [PATCH v2 1/2] iommu/sva: Tighten SVA bind API with explicit
 flags

On Wed, Apr 14, 2021 at 08:27:56AM -0700, Jacob Pan wrote:
>  static int idxd_enable_system_pasid(struct idxd_device *idxd)
>  {
> -	int flags;
> +	unsigned int flags;
>  	unsigned int pasid;
>  	struct iommu_sva *sva;
>  
> -	flags = SVM_FLAG_SUPERVISOR_MODE;
> +	flags = IOMMU_SVA_BIND_SUPERVISOR;
>  
> -	sva = iommu_sva_bind_device(&idxd->pdev->dev, NULL, &flags);
> +	sva = iommu_sva_bind_device(&idxd->pdev->dev, NULL, flags);

Please also remove the now pointless flags variable.

> +iommu_sva_bind_device(struct device *dev, struct mm_struct *mm, unsigned int flags)

Pleae avoid the pointless overly long line.

> -#define SVM_FLAG_GUEST_PASID		(1<<3)
> +#define SVM_FLAG_GUEST_PASID		(1<<2)

This flag is entirely unused, please just remove it in a prep patch
rather than renumbering it.

>  static inline struct iommu_sva *
> -iommu_sva_bind_device(struct device *dev, struct mm_struct *mm, void *drvdata)
> +iommu_sva_bind_device(struct device *dev, struct mm_struct *mm, unsigned int flags)

Same overy long line here.