ppc/pnv: Reparent user created PHB3 devices to the PnvChip

The powernv machine uses the object hierarchy to populate the device
tree and each device should be parented to the chip it belongs to.
This is not the case for user created devices which are parented to
the container "/unattached".

Make sure a PHB3 device is parented to its chip by reparenting the
object if necessary.

Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: Frederic Barrat <fbarrat@linux.ibm.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20220105212338.49899-8-danielhb413@gmail.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>

2 files changed, 23 insertions, 0 deletions

diff --git a/hw/pci-host/pnv_phb3.c b/hw/pci-host/pnv_phb3.c
index 1ebe43d..a52aedc 100644
--- a/hw/pci-host/pnv_phb3.c
+++ b/hw/pci-host/pnv_phb3.c
@@ -998,6 +998,12 @@ static void pnv_phb3_realize(DeviceState *dev, Error **errp)
             error_setg(errp, "invalid chip id: %d", phb->chip_id);
             return;
         }
+
+        /*
+         * Reparent user created devices to the chip to build
+         * correctly the device tree.
+         */
+        pnv_chip_parent_fixup(phb->chip, OBJECT(phb), phb->phb_id);
     }
 
     if (phb->phb_id >= PNV_CHIP_GET_CLASS(phb->chip)->num_phbs) {
diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
index ad02d56..fa5e7bc 100644
--- a/hw/ppc/pnv.c
+++ b/hw/ppc/pnv.c
@@ -1814,6 +1814,23 @@ static ICSState *pnv_ics_get(XICSFabric *xi, int irq)
     return NULL;
 }
 
+void pnv_chip_parent_fixup(PnvChip *chip, Object *obj, int index)
+{
+    Object *parent = OBJECT(chip);
+    g_autofree char *default_id =
+        g_strdup_printf("%s[%d]", object_get_typename(obj), index);
+
+    if (obj->parent == parent) {
+        return;
+    }
+
+    object_ref(obj);
+    object_unparent(obj);
+    object_property_add_child(
+        parent, DEVICE(obj)->id ? DEVICE(obj)->id : default_id, obj);
+    object_unref(obj);
+}
+
 PnvChip *pnv_get_chip(PnvMachineState *pnv, uint32_t chip_id)
 {
     int i;