linux-kernel - Re: [PATCH v3 3/5] iommu: Add iommu_get_domain_for_dev

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Message-ID: <ba8c8e60-5907-49d2-88ff-b9c6ab994d2f@linux.intel.com>
Date: Tue, 19 Aug 2025 10:09:49 +0800
From: Baolu Lu <baolu.lu@...ux.intel.com>
To: Jason Gunthorpe <jgg@...dia.com>
Cc: Nicolin Chen <nicolinc@...dia.com>, robin.murphy@....com,
 joro@...tes.org, bhelgaas@...gle.com, will@...nel.org,
 robin.clark@....qualcomm.com, yong.wu@...iatek.com, matthias.bgg@...il.com,
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 kevin.tian@...el.com, yi.l.liu@...el.com,
 linux-arm-kernel@...ts.infradead.org, iommu@...ts.linux.dev,
 linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
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 helgaas@...nel.org, etzhao1900@...il.com
Subject: Re: [PATCH v3 3/5] iommu: Add iommu_get_domain_for_dev_locked()
 helper

On 8/18/25 22:40, Jason Gunthorpe wrote:
> On Fri, Aug 15, 2025 at 01:28:02PM +0800, Baolu Lu wrote:
> 
>> Given that iommu_group->mutex is transparent to the iommu driver, how
>> about
> It is not actually transparent, alot of drivers are implicitly
> assuming that the core single threads their struct device for alot of
> the ops callbacks and we exposed the lockdep test to the drivers to
> help the document this.

Fair enough. It's the role of iommu_group_mutex_assert().

Thanks,
baolu