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

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Date:   Tue, 14 Jun 2022 12:48:06 +0800
From:   Baolu Lu <baolu.lu@...ux.intel.com>
To:     "Tian, Kevin" <kevin.tian@...el.com>,
        Joerg Roedel <joro@...tes.org>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        Jason Gunthorpe <jgg@...dia.com>
Cc:     baolu.lu@...ux.intel.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 1/1] iommu/vt-d: Add set_dev_pasid callbacks for default
 domain

On 2022/6/14 12:02, Tian, Kevin wrote:
>> 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...

It could be. I just wanted to maintain the integrity of Intel IOMMU
driver implementation.

> 
>> +/* 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.

How about struct device_pasid_info?

Best regards,
baolu