spapr, pnv, xive: Add a "xive-fabric" link to the XIVE router

In order to get rid of qdev_get_machine(), first add a pointer to the
XIVE fabric under the XIVE router and make it configurable through a
QOM link property.

Configure it in the spapr and pnv machine. In the case of pnv, the XIVE
routers are under the chip, so this is done with a QOM alias property of
the POWER9 pnv chip.

Signed-off-by: Greg Kurz <groug@kaod.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20200106145645.4539-5-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

hw/intc/xive.c

@@ -1714,12 +1714,19 @@ void xive_router_notify(XiveNotifier *xn, uint32_t lisn)
                            xive_get_field64(EAS_END_DATA,  eas.w));
 }
 
+static Property xive_router_properties[] = {
+    DEFINE_PROP_LINK("xive-fabric", XiveRouter, xfb,
+                     TYPE_XIVE_FABRIC, XiveFabric *),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
 static void xive_router_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
     XiveNotifierClass *xnc = XIVE_NOTIFIER_CLASS(klass);
 
     dc->desc    = "XIVE Router Engine";
+    dc->props   = xive_router_properties;
     xnc->notify = xive_router_notify;
 }
 
@@ -1727,6 +1734,7 @@ static const TypeInfo xive_router_info = {
     .name          = TYPE_XIVE_ROUTER,
     .parent        = TYPE_SYS_BUS_DEVICE,
     .abstract      = true,
+    .instance_size = sizeof(XiveRouter),
     .class_size    = sizeof(XiveRouterClass),
     .class_init    = xive_router_class_init,
     .interfaces    = (InterfaceInfo[]) {

hw/ppc/pnv.c

@@ -809,6 +809,10 @@ static void pnv_init(MachineState *machine)
         if (object_dynamic_cast(OBJECT(pnv), TYPE_XICS_FABRIC)) {
             object_property_set_link(chip, OBJECT(pnv), "xics", &error_abort);
         }
+        if (object_dynamic_cast(OBJECT(pnv), TYPE_XIVE_FABRIC)) {
+            object_property_set_link(chip, OBJECT(pnv), "xive-fabric",
+                                     &error_abort);
+        }
         object_property_set_bool(chip, true, "realized", &error_fatal);
     }
     g_free(chip_typename);
@@ -1227,6 +1231,8 @@ static void pnv_chip_power9_instance_init(Object *obj)
 
     object_initialize_child(obj, "xive", &chip9->xive, sizeof(chip9->xive),
                             TYPE_PNV_XIVE, &error_abort, NULL);
+    object_property_add_alias(obj, "xive-fabric", OBJECT(&chip9->xive),
+                              "xive-fabric", &error_abort);
 
     object_initialize_child(obj, "psi",  &chip9->psi, sizeof(chip9->psi),
                             TYPE_PNV9_PSI, &error_abort, NULL);

hw/ppc/spapr_irq.c

@@ -332,6 +332,8 @@ void spapr_irq_init(SpaprMachineState *spapr, Error **errp)
          * priority
          */
         qdev_prop_set_uint32(dev, "nr-ends", nr_servers << 3);
+        object_property_set_link(OBJECT(dev), OBJECT(spapr), "xive-fabric",
+                                 &error_abort);
         qdev_init_nofail(dev);
 
         spapr->xive = SPAPR_XIVE(dev);

include/hw/ppc/xive.h

@@ -324,9 +324,12 @@ typedef struct XiveTCTX {
 /*
  * XIVE Router
  */
+typedef struct XiveFabric XiveFabric;
 
 typedef struct XiveRouter {
     SysBusDevice    parent;
+
+    XiveFabric *xfb;
 } XiveRouter;
 
 #define TYPE_XIVE_ROUTER "xive-router"
@@ -402,8 +405,6 @@ int xive_presenter_tctx_match(XivePresenter *xptr, XiveTCTX *tctx,
  * XIVE Fabric (Interface between Interrupt Controller and Machine)
  */
 
-typedef struct XiveFabric XiveFabric;
-
 #define TYPE_XIVE_FABRIC "xive-fabric"
 #define XIVE_FABRIC(obj)                                     \
     INTERFACE_CHECK(XiveFabric, (obj), TYPE_XIVE_FABRIC)