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Date:   Mon, 15 Nov 2021 05:19:02 -0800
From:   Christoph Hellwig <hch@infradead.org>
To:     Lu Baolu <baolu.lu@linux.intel.com>
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Joerg Roedel <joro@8bytes.org>,
        Alex Williamson <alex.williamson@redhat.com>,
        Bjorn Helgaas <bhelgaas@google.com>,
        Jason Gunthorpe <jgg@nvidia.com>,
        Kevin Tian <kevin.tian@intel.com>,
        Ashok Raj <ashok.raj@intel.com>,
        Chaitanya Kulkarni <kch@nvidia.com>, kvm@vger.kernel.org,
        rafael@kernel.org, linux-pci@vger.kernel.org,
        Cornelia Huck <cohuck@redhat.com>,
        linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org,
        Jacob jun Pan <jacob.jun.pan@intel.com>,
        Diana Craciun <diana.craciun@oss.nxp.com>,
        Will Deacon <will@kernel.org>
Subject: Re: [PATCH 02/11] driver core: Set DMA ownership during driver
 bind/unbind
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References: <20211115020552.2378167-1-baolu.lu@linux.intel.com>
 <20211115020552.2378167-3-baolu.lu@linux.intel.com>
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On Mon, Nov 15, 2021 at 10:05:43AM +0800, Lu Baolu wrote:
> @@ -566,6 +567,12 @@ static int really_probe(struct device *dev, struct device_driver *drv)
>  		goto done;
>  	}
>  
> +	if (!drv->suppress_auto_claim_dma_owner) {
> +		ret = iommu_device_set_dma_owner(dev, DMA_OWNER_KERNEL, NULL);
> +		if (ret)
> +			return ret;
> +	}

I'd expect this to go into iommu_setup_dma_ops (and its arm and s390
equivalents), as that is what claims an IOMMU for in-kernel usage