}
}
-static int show_device_domain_translation(struct device *dev, void *data)
+static int __show_device_domain_translation(struct device *dev, void *data)
{
- struct device_domain_info *info = dev_iommu_priv_get(dev);
- struct dmar_domain *domain = info->domain;
+ struct dmar_domain *domain;
struct seq_file *m = data;
u64 path[6] = { 0 };
+ domain = to_dmar_domain(iommu_get_domain_for_dev(dev));
if (!domain)
return 0;
pgtable_walk_level(m, domain->pgd, domain->agaw + 2, 0, path);
seq_putc(m, '\n');
- return 0;
+ /* Don't iterate */
+ return 1;
}
-static int domain_translation_struct_show(struct seq_file *m, void *unused)
+static int show_device_domain_translation(struct device *dev, void *data)
{
- unsigned long flags;
- int ret;
+ struct iommu_group *group;
- spin_lock_irqsave(&device_domain_lock, flags);
- ret = bus_for_each_dev(&pci_bus_type, NULL, m,
- show_device_domain_translation);
- spin_unlock_irqrestore(&device_domain_lock, flags);
+ group = iommu_group_get(dev);
+ if (group) {
+ /*
+ * The group->mutex is held across the callback, which will
+ * block calls to iommu_attach/detach_group/device. Hence,
+ * the domain of the device will not change during traversal.
+ *
+ * All devices in an iommu group share a single domain, hence
+ * we only dump the domain of the first device. Even though,
+ * this code still possibly races with the iommu_unmap()
+ * interface. This could be solved by RCU-freeing the page
+ * table pages in the iommu_unmap() path.
+ */
+ iommu_group_for_each_dev(group, data,
+ __show_device_domain_translation);
+ iommu_group_put(group);
+ }
- return ret;
+ return 0;
+}
+
+static int domain_translation_struct_show(struct seq_file *m, void *unused)
+{
+ return bus_for_each_dev(&pci_bus_type, NULL, m,
+ show_device_domain_translation);
}
DEFINE_SHOW_ATTRIBUTE(domain_translation_struct);