linux-kernel - Re: [PATCH v7 03/10] iommu/sva: Add iommu_sva

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Message-ID: <20220525152538.GD1343366@nvidia.com>
Date:   Wed, 25 May 2022 12:25:38 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Baolu Lu <baolu.lu@...ux.intel.com>
Cc:     Joerg Roedel <joro@...tes.org>,
        Christoph Hellwig <hch@...radead.org>,
        Kevin Tian <kevin.tian@...el.com>,
        Ashok Raj <ashok.raj@...el.com>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Vinod Koul <vkoul@...nel.org>,
        Eric Auger <eric.auger@...hat.com>,
        Liu Yi L <yi.l.liu@...el.com>,
        Jacob jun Pan <jacob.jun.pan@...el.com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Jean-Philippe Brucker <jean-philippe@...aro.org>
Subject: Re: [PATCH v7 03/10] iommu/sva: Add iommu_sva_domain support

On Wed, May 25, 2022 at 01:19:08PM +0800, Baolu Lu wrote:
> Hi Jason,
> 
> On 2022/5/24 21:44, Jason Gunthorpe wrote:
> > > diff --git a/drivers/iommu/iommu-sva-lib.c b/drivers/iommu/iommu-sva-lib.c
> > > index 106506143896..210c376f6043 100644
> > > +++ b/drivers/iommu/iommu-sva-lib.c
> > > @@ -69,3 +69,51 @@ struct mm_struct *iommu_sva_find(ioasid_t pasid)
> > >   	return ioasid_find(&iommu_sva_pasid, pasid, __mmget_not_zero);
> > >   }
> > >   EXPORT_SYMBOL_GPL(iommu_sva_find);
> > > +
> > > +/*
> > > + * IOMMU SVA driver-oriented interfaces
> > > + */
> > > +struct iommu_domain *
> > > +iommu_sva_alloc_domain(struct bus_type *bus, struct mm_struct *mm)
> > This should return the proper type
> > 
> 
> Can you please elaborate a bit on "return the proper type"? Did you mean
> return iommu_sva_domain instead? That's a wrapper of iommu_domain and
> only for iommu internal usage.

If you are exposing special SVA APIs then it is not internal usage
only anymore, so expose the type.

Jason