[XEN][PATCH v5 10/17] xen/iommu: Introduce iommu_remove_dt_device()

[Vikram Garhwal <vikram.garhwal@amd.com>]

Remove master device from the IOMMU. This will be helpful when removing the
overlay nodes using dynamic programming during run time.

Signed-off-by: Vikram Garhwal <vikram.garhwal@amd.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 457df333a0..a77a217f3d 100644
--- a/xen/drivers/passthrough/device_tree.c
+++ b/xen/drivers/passthrough/device_tree.c
@@ -126,6 +126,44 @@ 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_locked(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 )
+        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 405db59971..079c06321e 100644
--- a/xen/include/xen/iommu.h
+++ b/xen/include/xen/iommu.h
@@ -218,6 +218,8 @@ int iommu_deassign_dt_device(struct domain *d, struct dt_device_node *dev);
 int iommu_dt_domain_init(struct domain *d);
 int iommu_release_dt_devices(struct domain *d);
 
+int iommu_remove_dt_device(struct dt_device_node *np);
+
 /*
  * Helper to add master device to the IOMMU using generic IOMMU DT bindings.
  *
-- 
2.17.1