linux-kernel - Re: [PATCH 05/20] iommu: Add iommu_paging_domain

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Date: Thu, 30 May 2024 11:09:45 +0800
From: Baolu Lu <baolu.lu@...ux.intel.com>
To: Yi Liu <yi.l.liu@...el.com>, Joerg Roedel <joro@...tes.org>,
 Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
 Jason Gunthorpe <jgg@...pe.ca>, Kevin Tian <kevin.tian@...el.com>
Cc: baolu.lu@...ux.intel.com, David Airlie <airlied@...il.com>,
 Daniel Vetter <daniel@...ll.ch>, Kalle Valo <kvalo@...nel.org>,
 Bjorn Andersson <andersson@...nel.org>,
 Mathieu Poirier <mathieu.poirier@...aro.org>,
 Alex Williamson <alex.williamson@...hat.com>, mst@...hat.com,
 Jason Wang <jasowang@...hat.com>, Thierry Reding <thierry.reding@...il.com>,
 Jonathan Hunter <jonathanh@...dia.com>,
 Mikko Perttunen <mperttunen@...dia.com>, iommu@...ts.linux.dev,
 dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/20] iommu: Add iommu_paging_domain_alloc() interface

On 5/30/24 9:59 AM, Baolu Lu wrote:
> On 5/29/24 5:04 PM, Yi Liu wrote:
>> On 2024/5/29 13:32, Lu Baolu wrote:
>>> Commit <17de3f5fdd35> ("iommu: Retire bus ops") removes iommu ops from
>>> bus. The iommu subsystem no longer relies on bus for operations. So the
>>> bus parameter in iommu_domain_alloc() is no longer relevant.
>>>
>>> Add a new interface named iommu_paging_domain_alloc(), which explicitly
>>> indicates the allocation of a paging domain for DMA managed by a kernel
>>> driver. The new interface takes a device pointer as its parameter, that
>>> better aligns with the current iommu subsystem.
>>
>> you may want to move this patch before patch 03/04.
> 
> Emm, why?

I see. The commit subject is misleading. It should be "vfio/type1: Use
iommu_user_domain_alloc()".

Best regards,
baolu