linux-kernel - RE: [PATCH RFC v3 04/12] iommu/sva: Basic data structures for SVA

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Message-ID: <BN9PR11MB52766016D2FAD092A892E2A58CED9@BN9PR11MB5276.namprd11.prod.outlook.com>
Date:   Tue, 12 Apr 2022 06:49:38 +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>
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 RFC v3 04/12] iommu/sva: Basic data structures for SVA

> From: Lu Baolu <baolu.lu@...ux.intel.com>
> Sent: Sunday, April 10, 2022 6:25 PM
> 
> Use below data structures for SVA implementation in the IOMMU core:
> 
> - struct iommu_sva_ioas
>   Represent the I/O address space shared with an application CPU address
>   space. This structure has a 1:1 relationship with an mm_struct. It
>   graps a "mm->mm_count" refcount during creation and drop it on release.
> 
> - struct iommu_domain (IOMMU_DOMAIN_SVA type)
>   Represent a hardware pagetable that the IOMMU hardware could use for
>   SVA translation. Multiple iommu domains could be bound with an SVA ioas
>   and each graps a refcount from ioas in order to make sure ioas could
>   only be freed after all domains have been unbound.
> 
> - struct iommu_sva
>   Represent a bond relationship between an SVA ioas and an iommu domain.
>   If a bond already exists, it's reused and a reference is taken.
> 
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>

This should be patch07. None of following patches touch those structures
until hitting patch08.