linux-kernel - Re: [PATCH 1/1] remoteproc: Use iommu_paging_domain

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Message-ID: <20240822162425.GE3468552@ziepe.ca>
Date: Thu, 22 Aug 2024 13:24:25 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: Mathieu Poirier <mathieu.poirier@...aro.org>
Cc: Lu Baolu <baolu.lu@...ux.intel.com>, andersson@...nel.org, afd@...com,
	nm@...com, hnagalla@...com, b-padhi@...com,
	Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
	Robin Murphy <robin.murphy@....com>,
	Kevin Tian <kevin.tian@...el.com>, linux-remoteproc@...r.kernel.org,
	iommu@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] remoteproc: Use iommu_paging_domain_alloc()

On Thu, Aug 22, 2024 at 10:17:56AM -0600, Mathieu Poirier wrote:

> > -	domain = iommu_domain_alloc(dev->bus);
> > -	if (!domain) {
> > +	domain = iommu_paging_domain_alloc(dev);
> 
> I'm a little hesitant here.  Function iommu_domain_alloc() passes NULL two the
> second argument of __iommu_domain_alloc() while iommu_paging_domain_alloc()
> provides a 'dev'.  I don't have any HW to test on and I am not familiar enough
> with the IOMMU subsystem to confidently more forward.

So long as dev is the device that will be initiating DMA this is a
correct change from the iommu subsystem perspective.

Jason