iommu: Print default domain type on boot

Introduce a subsys_initcall for IOMMU code and use it to
print the default domain type at boot.

Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 544f44fc08e4dc34e5d6c5cd4a80211102f080b8..31a66c4600bcb6d877d6516ff6a7f55cca690175 100644 (file)
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -93,12 +93,40 @@ struct iommu_group_attribute iommu_group_attr_##_name =             \
 static LIST_HEAD(iommu_device_list);
 static DEFINE_SPINLOCK(iommu_device_lock);
 
+/*
+ * Use a function instead of an array here because the domain-type is a
+ * bit-field, so an array would waste memory.
+ */
+static const char *iommu_domain_type_str(unsigned int t)
+{
+       switch (t) {
+       case IOMMU_DOMAIN_BLOCKED:
+               return "Blocked";
+       case IOMMU_DOMAIN_IDENTITY:
+               return "Passthrough";
+       case IOMMU_DOMAIN_UNMANAGED:
+               return "Unmanaged";
+       case IOMMU_DOMAIN_DMA:
+               return "Translated";
+       default:
+               return "Unknown";
+       }
+}
+
+static int __init iommu_subsys_init(void)
+{
+       pr_info("Default domain type: %s\n",
+               iommu_domain_type_str(iommu_def_domain_type));
+
+       return 0;
+}
+subsys_initcall(iommu_subsys_init);
+
 int iommu_device_register(struct iommu_device *iommu)
 {
        spin_lock(&iommu_device_lock);
        list_add_tail(&iommu->list, &iommu_device_list);
        spin_unlock(&iommu_device_lock);
-
        return 0;
 }