linux-kernel - RE: [PATCH 3/6] iommufd: Add IOMMU_DEVICE_GET

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Message-ID: <BN9PR11MB5276C3A941EE5EAAF58805068CDD9@BN9PR11MB5276.namprd11.prod.outlook.com>
Date:   Mon, 13 Feb 2023 02:04:20 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Jason Gunthorpe <jgg@...dia.com>
CC:     "Liu, Yi L" <yi.l.liu@...el.com>,
        "joro@...tes.org" <joro@...tes.org>,
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Subject: RE: [PATCH 3/6] iommufd: Add IOMMU_DEVICE_GET_INFO

> From: Jason Gunthorpe <jgg@...dia.com>
> Sent: Saturday, February 11, 2023 5:00 AM
> 
> 
> > > +struct iommu_device_info {
> > > +	__u32 size;
> > > +	__u32 flags;
> > > +	__u32 dev_id;
> > > +	__u32 data_len;
> > > +	__aligned_u64 data_ptr;
> >
> > moving forward iommu hw cap is not the only information reported
> > via this interface, e.g. it can be also used to report pasid mode.
> >
> > from this angle it's better to rename above two fields to be iommu
> > specific, e.g.:
> >
> > 	__u32 iommu_data_len;
> > 	__aligned_u64 iommu_data_ptr;
> 
> maybe call it hw info
> 

that is fine given we already have 'struct iommu_device_info'.

probably this cmd should be named as IOMMU_DEVIEC_GET_IOMMU_INFO
to be more accurate.