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

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Message-ID: <3e2e6ee7-984f-254e-7a3e-e32d6256c8f2@linux.intel.com>
Date:   Tue, 14 Jun 2022 14:13:07 +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 13:36, Tian, Kevin wrote:
>> From: Baolu Lu<baolu.lu@...ux.intel.com>
>> Sent: Tuesday, June 14, 2022 12:48 PM
>>
>> 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.
> but let's not add dead code. and this patch is actually a right step
> simply from set_dev_pasid() p.o.v hence you should include in any
> series which first tries to use that interface.
> 

Yes, that's my intention. If it reviews well, we can include it in the
driver's implementation.

Best regards,
baolu