linux-kernel - Re: [PATCH 07/11] iommu/arm-smmu: Make use of the iommu

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Date:   Fri, 10 Feb 2017 16:25:53 +0100
From:   Joerg Roedel <joro@...tes.org>
To:     Robin Murphy <robin.murphy@....com>
Cc:     Will Deacon <will.deacon@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Alex Williamson <alex.williamson@...hat.com>,
        David Woodhouse <dwmw2@...radead.org>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Joerg Roedel <jroedel@...e.de>
Subject: Re: [PATCH 07/11] iommu/arm-smmu: Make use of the iommu_register
 interface

On Fri, Feb 10, 2017 at 02:20:34PM +0000, Robin Murphy wrote:
> > @@ -1795,8 +1798,10 @@ static int arm_smmu_add_device(struct device *dev)
> >  	}
> >  
> >  	group = iommu_group_get_for_dev(dev);
> > -	if (!IS_ERR(group))
> > +	if (!IS_ERR(group)) {
> >  		iommu_group_put(group);
> > +		iommu_device_link(&smmu->iommu, dev);
> 
> Given the coupling evident from this and the other patches, might it
> work to simply do the linking/unlinking automatically in
> iommu_group_{add,remove}_device()?

Yes, this is one of the goals too. But currently we don't have a generic
device->hw_iommu mapping in the iommu-code which would allow to call
the link/unlink functions in generic code too.

But changing this is one of the next things on my list :)



	Joerg