linux-kernel - Re: [PATCH v6 1/6] iommu: Add cache_invalidate

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Message-ID: <20231206185031.GB2692119@nvidia.com>
Date:   Wed, 6 Dec 2023 14:50:31 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Nicolin Chen <nicolinc@...dia.com>
Cc:     Yi Liu <yi.l.liu@...el.com>, joro@...tes.org,
        alex.williamson@...hat.com, kevin.tian@...el.com,
        robin.murphy@....com, baolu.lu@...ux.intel.com, cohuck@...hat.com,
        eric.auger@...hat.com, kvm@...r.kernel.org, mjrosato@...ux.ibm.com,
        chao.p.peng@...ux.intel.com, yi.y.sun@...ux.intel.com,
        peterx@...hat.com, jasowang@...hat.com,
        shameerali.kolothum.thodi@...wei.com, lulu@...hat.com,
        suravee.suthikulpanit@....com, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        zhenzhong.duan@...el.com, joao.m.martins@...cle.com,
        xin.zeng@...el.com, yan.y.zhao@...el.com
Subject: Re: [PATCH v6 1/6] iommu: Add cache_invalidate_user op

On Wed, Dec 06, 2023 at 10:43:34AM -0800, Nicolin Chen wrote:
> On Wed, Dec 06, 2023 at 02:32:09PM -0400, Jason Gunthorpe wrote:
> > On Fri, Nov 17, 2023 at 05:07:12AM -0800, Yi Liu wrote:
>  
> > > @@ -465,6 +492,9 @@ struct iommu_domain_ops {
> > >  			      size_t size);
> > >  	void (*iotlb_sync)(struct iommu_domain *domain,
> > >  			   struct iommu_iotlb_gather *iotlb_gather);
> > > +	int (*cache_invalidate_user)(struct iommu_domain *domain,
> > > +				     struct iommu_user_data_array *array,
> > > +				     u32 *error_code);
> > 
> > Regarding the other conversation I worry a u32 error_code is too small.
> > 
> > Unfortunately there is no obvious place to put something better so if
> > we reach it we will have to add more error_code space via normal
> > extension.
> > 
> > Maybe expand this to u64? That is 64 bits of error register data and
> > the consumer index. It should do for SMMUv3 at least?
> 
> I think Yi is moving the error_code to the entry data structure,
> where we can even define a list of error_codes as a driver data
> needs. So, I assume this u32 pointer would be gone too.

Oh, lets see that then..

Jason