[PATCH for-7.2 v4 11/11] ppc/pnv: fix QOM parenting of user creatable root ports

[Daniel Henrique Barboza <danielhb413@gmail.com>]

User creatable root ports are being parented by the 'peripheral' or the
'peripheral-anon' container. This happens because this is the regular
QOM schema for sysbus devices that are added via the command line.

Let's make this QOM hierarchy similar to what we have with default root
ports, i.e. the root port must be parented by the pnv-root-bus. To do
that we change the qom and bus parent of the root port during
root_port_realize(). The realize() is shared by the default root port
code path, so we can remove the code inside pnv_phb_attach_root_port()
that was adding the root port as a child of the bus as well.

While we're at it, change pnv_phb_attach_root_port() to receive a PCIBus
instead of a PCIHostState to make it clear that the function does not
make use of the PHB.

Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
---
 hw/pci-host/pnv_phb.c | 35 +++++++++++++++--------------------
 1 file changed, 15 insertions(+), 20 deletions(-)

diff --git a/hw/pci-host/pnv_phb.c b/hw/pci-host/pnv_phb.c
index 17d9960aa1..65ed1f9eb4 100644
--- a/hw/pci-host/pnv_phb.c
+++ b/hw/pci-host/pnv_phb.c
@@ -51,27 +51,11 @@ static void pnv_parent_bus_fixup(DeviceState *parent, DeviceState *child,
     }
 }
 
-/*
- * Attach a root port device.
- *
- * 'index' will be used both as a PCIE slot value and to calculate
- * QOM id. 'chip_id' is going to be used as PCIE chassis for the
- * root port.
- */
-static void pnv_phb_attach_root_port(PCIHostState *pci)
+static void pnv_phb_attach_root_port(PCIBus *bus)
 {
     PCIDevice *root = pci_new(PCI_DEVFN(0, 0), TYPE_PNV_PHB_ROOT_PORT);
-    const char *dev_id = DEVICE(root)->id;
-    g_autofree char *default_id = NULL;
-    int index;
-
-    index = object_property_get_int(OBJECT(pci->bus), "phb-id", &error_fatal);
-    default_id = g_strdup_printf("%s[%d]", TYPE_PNV_PHB_ROOT_PORT, index);
-
-    object_property_add_child(OBJECT(pci->bus), dev_id ? dev_id : default_id,
-                              OBJECT(root));
 
-    pci_realize_and_unref(root, pci->bus, &error_fatal);
+    pci_realize_and_unref(root, bus, &error_fatal);
 }
 
 /*
@@ -171,7 +155,7 @@ static void pnv_phb_realize(DeviceState *dev, Error **errp)
         return;
     }
 
-    pnv_phb_attach_root_port(pci);
+    pnv_phb_attach_root_port(pci->bus);
 }
 
 static const char *pnv_phb_root_bus_path(PCIHostState *host_bridge,
@@ -240,12 +224,18 @@ static void pnv_phb_root_port_realize(DeviceState *dev, Error **errp)
 {
     PCIERootPortClass *rpc = PCIE_ROOT_PORT_GET_CLASS(dev);
     PnvPHBRootPort *phb_rp = PNV_PHB_ROOT_PORT(dev);
-    PCIBus *bus = PCI_BUS(qdev_get_parent_bus(dev));
+    BusState *qbus = qdev_get_parent_bus(dev);
+    PCIBus *bus = PCI_BUS(qbus);
     PCIDevice *pci = PCI_DEVICE(dev);
     uint16_t device_id = 0;
     Error *local_err = NULL;
     int chip_id, index;
 
+    /*
+     * 'index' will be used both as a PCIE slot value and to calculate
+     * QOM id. 'chip_id' is going to be used as PCIE chassis for the
+     * root port.
+     */
     chip_id = object_property_get_int(OBJECT(bus), "chip-id", &error_fatal);
     index = object_property_get_int(OBJECT(bus), "phb-id", &error_fatal);
 
@@ -253,6 +243,11 @@ static void pnv_phb_root_port_realize(DeviceState *dev, Error **errp)
     qdev_prop_set_uint8(dev, "chassis", chip_id);
     qdev_prop_set_uint16(dev, "slot", index);
 
+    pnv_parent_qom_fixup(OBJECT(bus), OBJECT(dev), index);
+    if (!qdev_set_parent_bus(dev, qbus, &error_fatal)) {
+        return;
+    }
+
     rpc->parent_realize(dev, &local_err);
     if (local_err) {
         error_propagate(errp, local_err);
-- 
2.36.1