linux-kernel - Re: [PATCH v10 04/12] iommu: Add attach/detach_dev

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Date:   Thu, 28 Jul 2022 08:59:45 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     "Tian, Kevin" <kevin.tian@...el.com>
Cc:     Baolu Lu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        Christoph Hellwig <hch@...radead.org>,
        "Raj, Ashok" <ashok.raj@...el.com>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>,
        "Jiang, Dave" <dave.jiang@...el.com>,
        Vinod Koul <vkoul@...nel.org>,
        Eric Auger <eric.auger@...hat.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "Pan, Jacob jun" <jacob.jun.pan@...el.com>,
        Zhangfei Gao <zhangfei.gao@...aro.org>,
        "Zhu, Tony" <tony.zhu@...el.com>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>
Subject: Re: [PATCH v10 04/12] iommu: Add attach/detach_dev_pasid iommu
 interface

On Thu, Jul 28, 2022 at 03:06:47AM +0000, Tian, Kevin wrote:

> > Then we don't need this weirdo check in the core iommu code at all.
> 
> and then we could also move group->pasid_array to device->pasid_array
> with this approach. Though the end result doesn't change i.e. still only
> the singleton group can enable pasid the iommu core can just stick to
> the device manner now.

I don't see why, the group is still logically the unit of attachment
in the iommu area, and if we have a multi-device group it just means
we iterate over all the devices in the group when doing pasid set, no
different than a RID.

Jason