From 0a647b76dbf29e6a20c328cd8676a1ca49526f09 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= <clg@kaod.org>
Date: Mon, 25 Jun 2018 11:17:14 +0200
Subject: [PATCH] ppc/xics: introduce a parent_realize in ICSStateClass
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This makes possible to move the common ICSState code of the realize
handlers in the ics-base class.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 hw/intc/xics.c        | 37 ++++++++++++++++++++++---------------
 hw/intc/xics_kvm.c    | 20 +++++++++++++++-----
 include/hw/ppc/xics.h |  3 ++-
 3 files changed, 39 insertions(+), 21 deletions(-)

diff --git a/hw/intc/xics.c b/hw/intc/xics.c
index 063491f387..d6066d561f 100644
--- a/hw/intc/xics.c
+++ b/hw/intc/xics.c
@@ -618,30 +618,31 @@ static void ics_simple_initfn(Object *obj)
     ics->offset = XICS_IRQ_BASE;
 }
 
-static void ics_simple_realize(ICSState *ics, Error **errp)
+static void ics_simple_realize(DeviceState *dev, Error **errp)
 {
-    if (!ics->nr_irqs) {
-        error_setg(errp, "Number of interrupts needs to be greater 0");
+    ICSState *ics = ICS_SIMPLE(dev);
+    ICSStateClass *icsc = ICS_BASE_GET_CLASS(ics);
+    Error *local_err = NULL;
+
+    icsc->parent_realize(dev, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
         return;
     }
-    ics->irqs = g_malloc0(ics->nr_irqs * sizeof(ICSIRQState));
+
     ics->qirqs = qemu_allocate_irqs(ics_simple_set_irq, ics, ics->nr_irqs);
 
     qemu_register_reset(ics_simple_reset, ics);
 }
 
-static Property ics_simple_properties[] = {
-    DEFINE_PROP_UINT32("nr-irqs", ICSState, nr_irqs, 0),
-    DEFINE_PROP_END_OF_LIST(),
-};
-
 static void ics_simple_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
     ICSStateClass *isc = ICS_BASE_CLASS(klass);
 
-    isc->realize = ics_simple_realize;
-    dc->props = ics_simple_properties;
+    device_class_set_parent_realize(dc, ics_simple_realize,
+                                    &isc->parent_realize);
+
     dc->vmsd = &vmstate_ics_simple;
     isc->reject = ics_simple_reject;
     isc->resend = ics_simple_resend;
@@ -659,7 +660,6 @@ static const TypeInfo ics_simple_info = {
 
 static void ics_base_realize(DeviceState *dev, Error **errp)
 {
-    ICSStateClass *icsc = ICS_BASE_GET_CLASS(dev);
     ICSState *ics = ICS_BASE(dev);
     Object *obj;
     Error *err = NULL;
@@ -672,17 +672,24 @@ static void ics_base_realize(DeviceState *dev, Error **errp)
     }
     ics->xics = XICS_FABRIC(obj);
 
-
-    if (icsc->realize) {
-        icsc->realize(ics, errp);
+    if (!ics->nr_irqs) {
+        error_setg(errp, "Number of interrupts needs to be greater 0");
+        return;
     }
+    ics->irqs = g_malloc0(ics->nr_irqs * sizeof(ICSIRQState));
 }
 
+static Property ics_base_properties[] = {
+    DEFINE_PROP_UINT32("nr-irqs", ICSState, nr_irqs, 0),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
 static void ics_base_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
 
     dc->realize = ics_base_realize;
+    dc->props = ics_base_properties;
 }
 
 static const TypeInfo ics_base_info = {
diff --git a/hw/intc/xics_kvm.c b/hw/intc/xics_kvm.c
index f511e50a80..1f27eb4979 100644
--- a/hw/intc/xics_kvm.c
+++ b/hw/intc/xics_kvm.c
@@ -345,13 +345,17 @@ static void ics_kvm_reset(void *dev)
     ics_set_kvm_state(ics, 1);
 }
 
-static void ics_kvm_realize(ICSState *ics, Error **errp)
+static void ics_kvm_realize(DeviceState *dev, Error **errp)
 {
-    if (!ics->nr_irqs) {
-        error_setg(errp, "Number of interrupts needs to be greater 0");
+    ICSState *ics = ICS_KVM(dev);
+    ICSStateClass *icsc = ICS_BASE_GET_CLASS(ics);
+    Error *local_err = NULL;
+
+    icsc->parent_realize(dev, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
         return;
     }
-    ics->irqs = g_malloc0(ics->nr_irqs * sizeof(ICSIRQState));
     ics->qirqs = qemu_allocate_irqs(ics_kvm_set_irq, ics, ics->nr_irqs);
 
     qemu_register_reset(ics_kvm_reset, ics);
@@ -360,8 +364,14 @@ static void ics_kvm_realize(ICSState *ics, Error **errp)
 static void ics_kvm_class_init(ObjectClass *klass, void *data)
 {
     ICSStateClass *icsc = ICS_BASE_CLASS(klass);
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    /*
+     * Use device_class_set_parent_realize() when ics-kvm inherits
+     * directly from ics-base and not from ics-simple anymore.
+     */
+    dc->realize = ics_kvm_realize;
 
-    icsc->realize = ics_kvm_realize;
     icsc->pre_save = ics_get_kvm_state;
     icsc->post_load = ics_set_kvm_state;
     icsc->synchronize_state = ics_synchronize_state;
diff --git a/include/hw/ppc/xics.h b/include/hw/ppc/xics.h
index 4b04b295a7..44e96e6400 100644
--- a/include/hw/ppc/xics.h
+++ b/include/hw/ppc/xics.h
@@ -115,7 +115,8 @@ struct PnvICPState {
 struct ICSStateClass {
     DeviceClass parent_class;
 
-    void (*realize)(ICSState *s, Error **errp);
+    DeviceRealize parent_realize;
+
     void (*pre_save)(ICSState *s);
     int (*post_load)(ICSState *s, int version_id);
     void (*reject)(ICSState *s, uint32_t irq);