linux-kernel - RE: [PATCH 1/1] iommu/vt-d: Add set_dev

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Message-ID: <DM4PR11MB5278EBE8FA26185D91ACCD118CAA9@DM4PR11MB5278.namprd11.prod.outlook.com>
Date:   Tue, 14 Jun 2022 04:02:42 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        Jason Gunthorpe <jgg@...dia.com>
CC:     "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 1/1] iommu/vt-d: Add set_dev_pasid callbacks for default
 domain

> From: Lu Baolu <baolu.lu@...ux.intel.com>
> Sent: Tuesday, June 14, 2022 11:44 AM
> 
> This allows the upper layers to set a domain to a PASID of a device
> if the PASID feature is supported by the IOMMU hardware. The typical
> use cases are, for example, kernel DMA with PASID and hardware
> assisted mediated device drivers.
> 

why is it not part of the series for those use cases? There is no consumer
of added callbacks in this patch...

> +/* PCI domain-subdevice relationship */
> +struct subdev_domain_info {
> +	struct list_head link_domain;	/* link to domain siblings */
> +	struct device *dev;		/* physical device derived from */
> +	ioasid_t pasid;			/* PASID on physical device */
> +};
> +

It's not subdev. Just dev+pasid in iommu's context.