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
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