iommu/arm-smmu: add devices attached to the SMMU to an IOMMU group
IOMMU groups are expected by certain users of the IOMMU API,
e.g. VFIO. Add new devices found by the SMMU driver to an IOMMU
group to satisfy those users.
Acked-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Antonios Motakis <a.motakis@virtualopensystems.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index e46a8870..879da20 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -1494,6 +1494,13 @@
{
struct arm_smmu_device *child, *parent, *smmu;
struct arm_smmu_master *master = NULL;
+ struct iommu_group *group;
+ int ret;
+
+ if (dev->archdata.iommu) {
+ dev_warn(dev, "IOMMU driver already assigned to device\n");
+ return -EINVAL;
+ }
spin_lock(&arm_smmu_devices_lock);
list_for_each_entry(parent, &arm_smmu_devices, list) {
@@ -1526,13 +1533,23 @@
if (!master)
return -ENODEV;
+ group = iommu_group_alloc();
+ if (IS_ERR(group)) {
+ dev_err(dev, "Failed to allocate IOMMU group\n");
+ return PTR_ERR(group);
+ }
+
+ ret = iommu_group_add_device(group, dev);
+ iommu_group_put(group);
dev->archdata.iommu = smmu;
- return 0;
+
+ return ret;
}
static void arm_smmu_remove_device(struct device *dev)
{
dev->archdata.iommu = NULL;
+ iommu_group_remove_device(dev);
}
static struct iommu_ops arm_smmu_ops = {