Re: [PATCH 02/11] driver core: Set DMA ownership during driver bind/unbind

[Christoph Hellwig]

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