diff options
Diffstat (limited to 'drivers/iommu/iommu.c')
| -rw-r--r-- | drivers/iommu/iommu.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 6b8d6e7771e1..ffad1eaf450d 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -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) |
