ppc/pnv: fix QOM parenting of user creatable root ports

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.

After all that, remove pnv_phb_attach_root_port() and create the root
port explictly in the 'default_enabled()' case of pnv_phb_realize().

Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Frederic Barrat <fbarrat@linux.ibm.com>
Message-Id: <20220819094748.400578-3-danielhb413@gmail.com>

1 files changed, 20 insertions, 27 deletions

diff --git a/hw/pci-host/pnv_phb.c b/hw/pci-host/pnv_phb.c
index 4ea33fb..7b11f1e 100644
--- a/hw/pci-host/pnv_phb.c
+++ b/hw/pci-host/pnv_phb.c
@@ -63,29 +63,6 @@ static bool pnv_parent_fixup(Object *parent, BusState *parent_bus,
 }
 
 /*
- * 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)
-{
-    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);
-}
-
-/*
  * User created devices won't have the initial setup that default
  * devices have. This setup consists of assigning a parent device
  * (chip for PHB3, PEC for PHB4/5) that will be the QOM/bus parent
@@ -180,11 +157,11 @@ static void pnv_phb_realize(DeviceState *dev, Error **errp)
         pnv_phb4_bus_init(dev, PNV_PHB4(phb->backend));
     }
 
-    if (!defaults_enabled()) {
-        return;
-    }
+    if (defaults_enabled()) {
+        PCIDevice *root = pci_new(PCI_DEVFN(0, 0), TYPE_PNV_PHB_ROOT_PORT);
 
-    pnv_phb_attach_root_port(pci);
+        pci_realize_and_unref(root, pci->bus, errp);
+    }
 }
 
 static const char *pnv_phb_root_bus_path(PCIHostState *host_bridge,
@@ -259,6 +236,11 @@ static void pnv_phb_root_port_realize(DeviceState *dev, Error **errp)
     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);
 
@@ -266,6 +248,17 @@ 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);
 
+    /*
+     * User created root ports are QOM parented to one of
+     * the peripheral containers but it's already at the right
+     * parent bus. Change the QOM parent to be the same as the
+     * parent bus it's already assigned to.
+     */
+    if (!pnv_parent_fixup(OBJECT(bus), BUS(bus), OBJECT(dev),
+                          index, errp)) {
+        return;
+    }
+
     rpc->parent_realize(dev, &local_err);
     if (local_err) {
         error_propagate(errp, local_err);