linux-kernel - RE: [PATCH v3 4/6] iommu: Regulate EINVAL in ->attach

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Message-ID: <BN9PR11MB52768A3239F75290F7842D0E8C4C9@BN9PR11MB5276.namprd11.prod.outlook.com>
Date:   Tue, 20 Sep 2022 06:29:28 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Nicolin Chen <nicolinc@...dia.com>,
        "joro@...tes.org" <joro@...tes.org>,
        "will@...nel.org" <will@...nel.org>,
        "robin.murphy@....com" <robin.murphy@....com>,
        "dwmw2@...radead.org" <dwmw2@...radead.org>,
        "baolu.lu@...ux.intel.com" <baolu.lu@...ux.intel.com>,
        "yong.wu@...iatek.com" <yong.wu@...iatek.com>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>
CC:     "jgg@...dia.com" <jgg@...dia.com>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH v3 4/6] iommu: Regulate EINVAL in ->attach_dev callback
 functions

> From: Nicolin Chen <nicolinc@...dia.com>
> Sent: Thursday, September 15, 2022 3:59 PM
>
> diff --git a/drivers/iommu/intel/pasid.c b/drivers/iommu/intel/pasid.c
> index c5e7e8b020a5..4cadbd744b7f 100644
> --- a/drivers/iommu/intel/pasid.c
> +++ b/drivers/iommu/intel/pasid.c
> @@ -101,8 +101,10 @@ int intel_pasid_alloc_table(struct device *dev)
> 
>  	might_sleep();
>  	info = dev_iommu_priv_get(dev);
> -	if (WARN_ON(!info || !dev_is_pci(dev) || info->pasid_table))
> -		return -EINVAL;
> +	if (WARN_ON(!info || !dev_is_pci(dev)))
> +		return -ENODEV;
> +	if (WARN_ON(info->pasid_table))
> +		return -EBUSY;

-EEXIST. It's not a busy condition which might change sometime after.

btw below -EVINAL in viommu should be converted to -ENODEV too
since it's a check purely on device side:

viommu_domain_finalise()
        viommu_page_size = 1UL << __ffs(viommu->pgsize_bitmap);
        if (viommu_page_size > PAGE_SIZE) {
                dev_err(vdev->dev,
                        "granule 0x%lx larger than system page size 0x%lx\n",
                        viommu_page_size, PAGE_SIZE);
                return -EINVAL;
        }