linux-kernel - RE: [PATCH v7 06/10] iommu/sva: Refactoring iommu_sva_bind/unbind

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Message-ID: <BN9PR11MB5276E462E3B32DDE54DD66418CD79@BN9PR11MB5276.namprd11.prod.outlook.com>
Date:   Tue, 24 May 2022 10:22:28 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        "Jason Gunthorpe" <jgg@...dia.com>,
        Christoph Hellwig <hch@...radead.org>,
        "Raj, Ashok" <ashok.raj@...el.com>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>,
        "Jiang, Dave" <dave.jiang@...el.com>, Vinod Koul <vkoul@...nel.org>
CC:     Eric Auger <eric.auger@...hat.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "Pan, Jacob jun" <jacob.jun.pan@...el.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v7 06/10] iommu/sva: Refactoring
 iommu_sva_bind/unbind_device()

> From: Lu Baolu <baolu.lu@...ux.intel.com>
> Sent: Thursday, May 19, 2022 3:21 PM
> 
> The existing iommu SVA interfaces are implemented by calling the SVA
> specific iommu ops provided by the IOMMU drivers. There's no need for
> any SVA specific ops in iommu_ops vector anymore as we can achieve
> this through the generic attach/detach_dev_pasid domain ops.

set/block_pasid_dev, to be consistent.

> +
> +	mutex_lock(&iommu_sva_lock);
> +	/* Search for an existing domain. */
> +	domain = iommu_get_domain_for_dev_pasid(dev, mm->pasid);
> +	if (domain) {
> +		sva_domain = to_sva_domain(domain);
> +		refcount_inc(&sva_domain->bond.users);
> +		goto out_success;
> +	}
> +

why would one device/pasid be bound to a mm more than once?