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.
Signed-off-by: Antonios Motakis <a.motakis@xxxxxxxxxxxxxxxxxxxxxx>
---
drivers/iommu/arm-smmu.c | 18 +++++++++++++++++-
1 file changed, 17 insertions(+), 1 deletion(-)
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 0f45a48..8b71332 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -1502,6 +1502,8 @@ static int arm_smmu_add_device(struct device *dev)
{
struct arm_smmu_device *child, *parent, *smmu;
struct arm_smmu_master *master = NULL;
+ struct iommu_group *group;
+ int ret;
spin_lock(&arm_smmu_devices_lock);
list_for_each_entry(parent, &arm_smmu_devices, list) {
@@ -1534,13 +1536,27 @@ static int arm_smmu_add_device(struct device *dev)
if (!master)
return -ENODEV;
+ group = iommu_group_get(dev);
+
+ if (!group) {
+ 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 = {
--
1.8.1.2
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