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

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Message-ID: <20250818144051.GP802098@nvidia.com>
Date: Mon, 18 Aug 2025 11:40:51 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Baolu Lu <baolu.lu@...ux.intel.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, angelogioacchino.delregno@...labora.com,
	thierry.reding@...il.com, vdumpa@...dia.com, jonathanh@...dia.com,
	rafael@...nel.org, lenb@...nel.org, 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, linux-mediatek@...ts.infradead.org,
	linux-tegra@...r.kernel.org, linux-acpi@...r.kernel.org,
	linux-pci@...r.kernel.org, patches@...ts.linux.dev,
	pjaroszynski@...dia.com, vsethi@...dia.com, helgaas@...nel.org,
	etzhao1900@...il.com
Subject: Re: [PATCH v3 3/5] iommu: Add iommu_get_domain_for_dev_locked()
 helper

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.

Jason