ppc/pnv: add PnvPHB base/proxy device

The PnvPHB device is going to be the base device for all other powernv
PHBs. It consists of a device that has the same user API as the other
PHB, namely being a PCIHostBridge and having chip-id and index
properties. It also has a 'backend' pointer that will be initialized
with the PHB implementation that the device is going to use.

The initialization of the PHB backend is done by checking the PHB
version via a 'version' attribute that can be set via a global machine
property.  The 'version' field will be used to make adjustments based on
the running version, e.g. PHB3 uses a 'chip' reference while PHB4 uses
'pec'. To init the PnvPHB bus we'll rely on helpers for each version.
The version 3 helper is already added (pnv_phb3_bus_init), the PHB4
helper will be added later on.

For now let's add the basic logic of the PnvPHB object, which consists
mostly of pnv_phb_realize() doing all the work of checking the
phb->version set, initializing the proper backend, passing through its
attributes to the chosen backend, finalizing the backend realize and
adding a root port in the end.

Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: Frederic Barrat <fbarrat@linux.ibm.com>
Message-Id: <20220624084921.399219-3-danielhb413@gmail.com>

hw/pci-host/meson.build

@@ -35,5 +35,6 @@ specific_ss.add(when: 'CONFIG_PCI_POWERNV', if_true: files(
   'pnv_phb3_msi.c',
   'pnv_phb3_pbcq.c',
   'pnv_phb4.c',
-  'pnv_phb4_pec.c'
+  'pnv_phb4_pec.c',
+  'pnv_phb.c',
 ))

hw/pci-host/pnv_phb.c

@@ -0,0 +1,124 @@
+/*
+ * QEMU PowerPC PowerNV Proxy PHB model
+ *
+ * Copyright (c) 2022, IBM Corporation.
+ *
+ * This code is licensed under the GPL version 2 or later. See the
+ * COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/log.h"
+#include "qapi/visitor.h"
+#include "qapi/error.h"
+#include "hw/pci-host/pnv_phb.h"
+#include "hw/pci-host/pnv_phb3.h"
+#include "hw/pci-host/pnv_phb4.h"
+#include "hw/ppc/pnv.h"
+#include "hw/qdev-properties.h"
+#include "qom/object.h"
+
+
+static void pnv_phb_realize(DeviceState *dev, Error **errp)
+{
+    PnvPHB *phb = PNV_PHB(dev);
+    PCIHostState *pci = PCI_HOST_BRIDGE(dev);
+    g_autofree char *phb_typename = NULL;
+    g_autofree char *phb_rootport_typename = NULL;
+
+    if (!phb->version) {
+        error_setg(errp, "version not specified");
+        return;
+    }
+
+    switch (phb->version) {
+    case 3:
+        phb_typename = g_strdup(TYPE_PNV_PHB3);
+        phb_rootport_typename = g_strdup(TYPE_PNV_PHB3_ROOT_PORT);
+        break;
+    case 4:
+        phb_typename = g_strdup(TYPE_PNV_PHB4);
+        phb_rootport_typename = g_strdup(TYPE_PNV_PHB4_ROOT_PORT);
+        break;
+    case 5:
+        phb_typename = g_strdup(TYPE_PNV_PHB5);
+        phb_rootport_typename = g_strdup(TYPE_PNV_PHB5_ROOT_PORT);
+        break;
+    default:
+        g_assert_not_reached();
+    }
+
+    phb->backend = object_new(phb_typename);
+    object_property_add_child(OBJECT(dev), "phb-backend", phb->backend);
+
+    /* Passthrough child device properties to the proxy device */
+    object_property_set_uint(phb->backend, "index", phb->phb_id, errp);
+    object_property_set_uint(phb->backend, "chip-id", phb->chip_id, errp);
+    object_property_set_link(phb->backend, "phb-base", OBJECT(phb), errp);
+
+    if (phb->version == 3) {
+        object_property_set_link(phb->backend, "chip",
+                                 OBJECT(phb->chip), errp);
+    } else {
+        object_property_set_link(phb->backend, "pec", OBJECT(phb->pec), errp);
+    }
+
+    if (!qdev_realize(DEVICE(phb->backend), NULL, errp)) {
+        return;
+    }
+
+    if (phb->version == 3) {
+        pnv_phb3_bus_init(dev, PNV_PHB3(phb->backend));
+    }
+
+    pnv_phb_attach_root_port(pci, phb_rootport_typename,
+                             phb->phb_id, phb->chip_id);
+}
+
+static const char *pnv_phb_root_bus_path(PCIHostState *host_bridge,
+                                         PCIBus *rootbus)
+{
+    PnvPHB *phb = PNV_PHB(host_bridge);
+
+    snprintf(phb->bus_path, sizeof(phb->bus_path), "00%02x:%02x",
+             phb->chip_id, phb->phb_id);
+    return phb->bus_path;
+}
+
+static Property pnv_phb_properties[] = {
+    DEFINE_PROP_UINT32("index", PnvPHB, phb_id, 0),
+    DEFINE_PROP_UINT32("chip-id", PnvPHB, chip_id, 0),
+    DEFINE_PROP_UINT32("version", PnvPHB, version, 0),
+
+    DEFINE_PROP_LINK("chip", PnvPHB, chip, TYPE_PNV_CHIP, PnvChip *),
+
+    DEFINE_PROP_LINK("pec", PnvPHB, pec, TYPE_PNV_PHB4_PEC,
+                     PnvPhb4PecState *),
+
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void pnv_phb_class_init(ObjectClass *klass, void *data)
+{
+    PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(klass);
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    hc->root_bus_path = pnv_phb_root_bus_path;
+    dc->realize = pnv_phb_realize;
+    device_class_set_props(dc, pnv_phb_properties);
+    set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
+    dc->user_creatable = false;
+}
+
+static void pnv_phb_register_type(void)
+{
+    static const TypeInfo pnv_phb_type_info = {
+        .name          = TYPE_PNV_PHB,
+        .parent        = TYPE_PCIE_HOST_BRIDGE,
+        .instance_size = sizeof(PnvPHB),
+        .class_init    = pnv_phb_class_init,
+    };
+
+    type_register_static(&pnv_phb_type_info);
+}
+type_init(pnv_phb_register_type)

hw/pci-host/pnv_phb.h

@@ -0,0 +1,39 @@
+/*
+ * QEMU PowerPC PowerNV Proxy PHB model
+ *
+ * Copyright (c) 2022, IBM Corporation.
+ *
+ * This code is licensed under the GPL version 2 or later. See the
+ * COPYING file in the top-level directory.
+ */
+
+#ifndef PCI_HOST_PNV_PHB_H
+#define PCI_HOST_PNV_PHB_H
+
+#include "hw/pci/pcie_host.h"
+#include "hw/pci/pcie_port.h"
+#include "qom/object.h"
+
+typedef struct PnvChip PnvChip;
+typedef struct PnvPhb4PecState PnvPhb4PecState;
+
+struct PnvPHB {
+    PCIExpressHost parent_obj;
+
+    uint32_t chip_id;
+    uint32_t phb_id;
+    uint32_t version;
+    char bus_path[8];
+
+    PnvChip *chip;
+
+    PnvPhb4PecState *pec;
+
+    /* The PHB backend (PnvPHB3, PnvPHB4 ...) being used */
+    Object *backend;
+};
+
+#define TYPE_PNV_PHB "pnv-phb"
+OBJECT_DECLARE_SIMPLE_TYPE(PnvPHB, PNV_PHB)
+
+#endif /* PCI_HOST_PNV_PHB_H */