linux-kernel - Re: [PATCH v4 1/6] iommu: Add a per domain PASID for DMA API

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Message-ID: <868984fa-c8bc-635c-1788-99bc8e6fd587@linux.intel.com>
Date:   Wed, 1 Jun 2022 17:37:25 +0800
From:   Baolu Lu <baolu.lu@...ux.intel.com>
To:     "Tian, Kevin" <kevin.tian@...el.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc:     baolu.lu@...ux.intel.com, Jason Gunthorpe <jgg@...dia.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
        Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>,
        Christoph Hellwig <hch@...radead.org>,
        "vkoul@...nel.org" <vkoul@...nel.org>,
        "robin.murphy@....com" <robin.murphy@....com>,
        "will@...nel.org" <will@...nel.org>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "Jiang, Dave" <dave.jiang@...el.com>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        Eric Auger <eric.auger@...hat.com>
Subject: Re: [PATCH v4 1/6] iommu: Add a per domain PASID for DMA API

On 2022/6/1 09:43, Tian, Kevin wrote:
>> From: Jacob Pan<jacob.jun.pan@...ux.intel.com>
>> Sent: Wednesday, June 1, 2022 1:30 AM
>>>> In both cases the pasid is stored in the attach data instead of the
>>>> domain.
>>>>
>> So during IOTLB flush for the domain, do we loop through the attach data?
> Yes and it's required.

What does the attach data mean here? Do you mean group->pasid_array?

Why not tracking the {device, pasid} info in the iommu driver when
setting domain to {device, pasid}? We have tracked device in a list when
setting a domain to device.

Best regards,
baolu