Remove master device from the IOMMU.
Signed-off-by: Vikram Garhwal <fnu.vik...@xilinx.com>
---
xen/drivers/passthrough/device_tree.c | 38 +++++++++++++++++++++++++++
xen/include/xen/iommu.h | 2 ++
2 files changed, 40 insertions(+)
diff --git a/xen/drivers/passthrough/device_tree.c
b/xen/drivers/passthrough/device_tree.c
index 776809a8f2..5cd0b20c77 100644
--- a/xen/drivers/passthrough/device_tree.c
+++ b/xen/drivers/passthrough/device_tree.c
@@ -125,6 +125,44 @@ int iommu_release_dt_devices(struct domain *d)
return 0;
}
+int iommu_remove_dt_device(struct dt_device_node *np)
+{
+ const struct iommu_ops *ops = iommu_get_ops();
+ struct device *dev = dt_to_dev(np);
+ int rc;
+
+ if ( !ops )
+ return -EOPNOTSUPP;
+
+ spin_lock(&dtdevs_lock);
+
+ if ( iommu_dt_device_is_assigned_lock(np) ) {
+ rc = -EBUSY;
+ goto fail;
+ }
+
+ /*
+ * The driver which supports generic IOMMU DT bindings must have
+ * these callback implemented.
+ */
+ if ( !ops->remove_device ) {
+ rc = -EOPNOTSUPP;
+ goto fail;
+ }
+
+ /*
+ * Remove master device from the IOMMU if latter is present and available.
+ */
+ rc = ops->remove_device(0, dev);
+
+ if ( rc == 0 )
+ iommu_fwspec_free(dev);
+
+fail:
+ spin_unlock(&dtdevs_lock);
+ return rc;
+}
+
int iommu_add_dt_device(struct dt_device_node *np)
{
const struct iommu_ops *ops = iommu_get_ops();
diff --git a/xen/include/xen/iommu.h b/xen/include/xen/iommu.h
index b18e7760a2..64871e5cb8 100644
--- a/xen/include/xen/iommu.h
+++ b/xen/include/xen/iommu.h
@@ -215,6 +215,8 @@ int iommu_release_dt_devices(struct domain *d);
*/
int iommu_add_dt_device(struct dt_device_node *np);
+int iommu_remove_dt_device(struct dt_device_node *np);
+
int iommu_do_dt_domctl(struct xen_domctl *, struct domain *,
XEN_GUEST_HANDLE_PARAM(xen_domctl_t));
--
2.17.1
