[PATCH 07/17] ppc/pnv: user created pnv-phb for powernv8

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

This patch reintroduces the powernv8 bits of the code what was removed
in commit 9c10d86fee "ppc/pnv: Remove user-created PHB{3,4,5} devices",
using the pnv-phb device instead of the now late pnv-phb3 device,
allowing us to enable user creatable pnv-phb devices for the powernv8
machine.

Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
---
 hw/pci-host/pnv_phb3.c | 31 +++++++++++++++++++++++++++++--
 hw/ppc/pnv.c           | 23 ++++++++++++++++++++++-
 include/hw/ppc/pnv.h   |  1 +
 3 files changed, 52 insertions(+), 3 deletions(-)

diff --git a/hw/pci-host/pnv_phb3.c b/hw/pci-host/pnv_phb3.c
index d2405d4f5a..a6d6a10c52 100644
--- a/hw/pci-host/pnv_phb3.c
+++ b/hw/pci-host/pnv_phb3.c
@@ -993,6 +993,30 @@ void pnv_phb3_realize(DeviceState *dev, Error **errp)
     PnvMachineState *pnv = PNV_MACHINE(qdev_get_machine());
     int i;
 
+    /* User created devices */
+    if (!phb->chip) {
+        Error *local_err = NULL;
+        BusState *s;
+
+        phb->chip = pnv_get_chip(pnv, phb->chip_id);
+        if (!phb->chip) {
+            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);
+
+        s = qdev_get_parent_bus(DEVICE(phb->chip));
+        if (!qdev_set_parent_bus(DEVICE(phb), s, &local_err)) {
+            error_propagate(errp, local_err);
+            return;
+        }
+    }
+
     if (phb->phb_id >= PNV_CHIP_GET_CLASS(phb->chip)->num_phbs) {
         error_setg(errp, "invalid PHB index: %d", phb->phb_id);
         return;
@@ -1052,7 +1076,10 @@ void pnv_phb3_realize(DeviceState *dev, Error **errp)
 
     pci_setup_iommu(pci->bus, pnv_phb3_dma_iommu, phb);
 
-    pnv_phb_attach_root_port(PCI_HOST_BRIDGE(phb), TYPE_PNV_PHB3_ROOT_PORT);
+    if (defaults_enabled()) {
+        pnv_phb_attach_root_port(PCI_HOST_BRIDGE(phb),
+                                 TYPE_PNV_PHB3_ROOT_PORT);
+    }
 }
 
 void pnv_phb3_update_regions(PnvPHB *phb)
@@ -1137,7 +1164,7 @@ static void pnv_phb3_root_port_class_init(ObjectClass *klass, void *data)
 
     device_class_set_parent_realize(dc, pnv_phb3_root_port_realize,
                                     &rpc->parent_realize);
-    dc->user_creatable = false;
+    dc->user_creatable = true;
 
     k->vendor_id = PCI_VENDOR_ID_IBM;
     k->device_id = 0x03dc;
diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
index 12a3fe4920..d9e7530cd3 100644
--- a/hw/ppc/pnv.c
+++ b/hw/ppc/pnv.c
@@ -1152,7 +1152,9 @@ static void pnv_chip_power8_instance_init(Object *obj)
 
     object_initialize_child(obj, "homer", &chip8->homer, TYPE_PNV8_HOMER);
 
-    chip8->num_phbs = pcc->num_phbs;
+    if (defaults_enabled()) {
+        chip8->num_phbs = pcc->num_phbs;
+    }
 
     for (i = 0; i < chip8->num_phbs; i++) {
         object_initialize_child(obj, "phb[*]", &chip8->phbs[i], TYPE_PNV_PHB);
@@ -1977,6 +1979,23 @@ 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;
@@ -2116,6 +2135,8 @@ static void pnv_machine_power8_class_init(ObjectClass *oc, void *data)
 
     pmc->compat = compat;
     pmc->compat_size = sizeof(compat);
+
+    machine_class_allow_dynamic_sysbus_dev(mc, TYPE_PNV_PHB);
 }
 
 static void pnv_machine_power9_class_init(ObjectClass *oc, void *data)
diff --git a/include/hw/ppc/pnv.h b/include/hw/ppc/pnv.h
index 539454fe9d..e489bec019 100644
--- a/include/hw/ppc/pnv.h
+++ b/include/hw/ppc/pnv.h
@@ -190,6 +190,7 @@ DECLARE_INSTANCE_CHECKER(PnvChip, PNV_CHIP_POWER10,
 
 PowerPCCPU *pnv_chip_find_cpu(PnvChip *chip, uint32_t pir);
 void pnv_phb_attach_root_port(PCIHostState *pci, const char *name);
+void pnv_chip_parent_fixup(PnvChip *chip, Object *obj, int index);
 
 #define TYPE_PNV_MACHINE       MACHINE_TYPE_NAME("powernv")
 typedef struct PnvMachineClass PnvMachineClass;
-- 
2.32.0