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Commit beed2821 authored by Joerg Roedel's avatar Joerg Roedel
Browse files

iommu: Create direct mappings in default domains 



Use the information exported by the IOMMU drivers to create
direct mapped regions in the default domains.

Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent a1015c2b

drivers/iommu/iommu.c

+48 −0
Original line number Diff line number Diff line
@@ -325,6 +325,52 @@ int iommu_group_set_name(struct iommu_group *group, const char *name) 
}

EXPORT_SYMBOL_GPL(iommu_group_set_name);



static int iommu_group_create_direct_mappings(struct iommu_group *group,

					      struct device *dev)

{

	struct iommu_domain *domain = group->default_domain;

	struct iommu_dm_region *entry;

	struct list_head mappings;

	unsigned long pg_size;

	int ret = 0;



	if (!domain || domain->type != IOMMU_DOMAIN_DMA)

		return 0;



	BUG_ON(!domain->ops->pgsize_bitmap);



	pg_size = 1UL << __ffs(domain->ops->pgsize_bitmap);

	INIT_LIST_HEAD(&mappings);



	iommu_get_dm_regions(dev, &mappings);



	/* We need to consider overlapping regions for different devices */

	list_for_each_entry(entry, &mappings, list) {

		dma_addr_t start, end, addr;



		start = ALIGN(entry->start, pg_size);

		end   = ALIGN(entry->start + entry->length, pg_size);



		for (addr = start; addr < end; addr += pg_size) {

			phys_addr_t phys_addr;



			phys_addr = iommu_iova_to_phys(domain, addr);

			if (phys_addr)

				continue;



			ret = iommu_map(domain, addr, addr, pg_size, entry->prot);

			if (ret)

				goto out;

		}



	}



out:

	iommu_put_dm_regions(dev, &mappings);



	return ret;

}



/**

 * iommu_group_add_device - add a device to an iommu group

 * @group: the group into which to add the device (reference should be held)
@@ -381,6 +427,8 @@ rename: 


	dev->iommu_group = group;



	iommu_group_create_direct_mappings(group, dev);



	mutex_lock(&group->mutex);

	list_add_tail(&device->list, &group->devices);

	if (group->domain)