Subject: [PATCH v2 5/5] iommu: Allow default domain type to be set on the kernel command line

From: [email-masked] (Joerg Roedel)
Date: Tue, 21 Mar 2017 16:45:27 +0100

Hi Will,

On Fri, Mar 10, 2017 at 08:49:36PM +0000, Will Deacon wrote:
> @@ -1014,8 +1027,8 @@ struct iommu_group *iommu_group_get_for_dev(struct device *dev)
>  	 * IOMMU driver.
>  	 */
>  	if (!group->default_domain) {
> -		group->default_domain = __iommu_domain_alloc(dev->bus,
> -							     IOMMU_DOMAIN_DMA);
> +		group->default_domain =
> +			__iommu_domain_alloc(dev->bus, iommu_def_domain_type);

It would be good to have a fall-back here if we are talking to an IOMMU
driver that uses default domains, but does not support identity-mapped
domains (yet). Exynos and Rockchip IOMMU drivers seem to fall into this
category. A dev_warn() also makes sense in case allocating a identity
domain fails.

	Joerg