Re: [PATCH 1/1] remoteproc: Use iommu_paging_domain_alloc()

[Jason Gunthorpe]

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