iommu: Introduce new 'struct iommu_device'

This struct represents one hardware iommu in the iommu core
code. For now it only has the iommu-ops associated with it,
but that will be extended soon.

The register/unregister interface is also added, as well as
making use of it in the Intel and AMD IOMMU drivers.

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

1 files changed, 19 insertions, 0 deletions

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index cc569b1b66a2..1dfd70ea27e4 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -77,6 +77,25 @@ struct iommu_group_attribute iommu_group_attr_##_name =		\
 #define to_iommu_group(_kobj)           \
         container_of(_kobj, struct iommu_group, kobj)
 
+static LIST_HEAD(iommu_device_list);
+static DEFINE_SPINLOCK(iommu_device_lock);
+
+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;
+}
+
+void iommu_device_unregister(struct iommu_device *iommu)
+{
+        spin_lock(&iommu_device_lock);
+        list_del(&iommu->list);
+        spin_unlock(&iommu_device_lock);
+}
+
 static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus,
                                                  unsigned type);
 static int __iommu_attach_device(struct iommu_domain *domain,