[Qemu-ppc] [PATCH v4 06/28] ppc/xive: introduce the XiveFabric interface

[Cédric Le Goater]

The XiveFabric offers a simple interface, between the XiveSource
object and the main interrupt controller of the machine. It will
forward event notifications to the XIVE Interrupt Virtualization
Routing Engine (IVRE).

Signed-off-by: Cédric Le Goater <address@hidden>
---
 include/hw/ppc/xive.h | 23 +++++++++++++++++++++++
 hw/intc/xive.c        | 25 +++++++++++++++++++++++++
 2 files changed, 48 insertions(+)

diff --git a/include/hw/ppc/xive.h b/include/hw/ppc/xive.h
index e118acd59f1e..be93fae6317b 100644
--- a/include/hw/ppc/xive.h
+++ b/include/hw/ppc/xive.h
@@ -13,6 +13,27 @@
 #include "hw/sysbus.h"
 
 /*
+ * XIVE Fabric (Interface between Source and Router)
+ */
+
+typedef struct XiveFabric {
+    Object parent;
+} XiveFabric;
+
+#define TYPE_XIVE_FABRIC "xive-fabric"
+#define XIVE_FABRIC(obj)                                     \
+    OBJECT_CHECK(XiveFabric, (obj), TYPE_XIVE_FABRIC)
+#define XIVE_FABRIC_CLASS(klass)                                     \
+    OBJECT_CLASS_CHECK(XiveFabricClass, (klass), TYPE_XIVE_FABRIC)
+#define XIVE_FABRIC_GET_CLASS(obj)                                   \
+    OBJECT_GET_CLASS(XiveFabricClass, (obj), TYPE_XIVE_FABRIC)
+
+typedef struct XiveFabricClass {
+    InterfaceClass parent;
+    void (*notify)(XiveFabric *xf, uint32_t lisn);
+} XiveFabricClass;
+
+/*
  * XIVE Interrupt Source
  */
 
@@ -42,6 +63,8 @@ typedef struct XiveSource {
     uint64_t        esb_flags;
     uint32_t        esb_shift;
     MemoryRegion    esb_mmio;
+
+    XiveFabric      *xive;
 } XiveSource;
 
 /*
diff --git a/hw/intc/xive.c b/hw/intc/xive.c
index 3ad8c151b9dc..3f6fcb358f83 100644
--- a/hw/intc/xive.c
+++ b/hw/intc/xive.c
@@ -152,7 +152,11 @@ static bool xive_source_esb_eoi(XiveSource *xsrc, uint32_t 
srcno)
  */
 static void xive_source_notify(XiveSource *xsrc, int srcno)
 {
+    XiveFabricClass *xfc = XIVE_FABRIC_GET_CLASS(xsrc->xive);
 
+    if (xfc->notify) {
+        xfc->notify(xsrc->xive, srcno);
+    }
 }
 
 /* In a two pages ESB MMIO setting, even page is the trigger page, odd
@@ -358,6 +362,17 @@ static void xive_source_reset(DeviceState *dev)
 static void xive_source_realize(DeviceState *dev, Error **errp)
 {
     XiveSource *xsrc = XIVE_SOURCE(dev);
+    Object *obj;
+    Error *local_err = NULL;
+
+    obj = object_property_get_link(OBJECT(dev), "xive", &local_err);
+    if (!obj) {
+        error_propagate(errp, local_err);
+        error_prepend(errp, "required link 'xive' not found: ");
+        return;
+    }
+
+    xsrc->xive = XIVE_FABRIC(obj);
 
     if (!xsrc->nr_irqs) {
         error_setg(errp, "Number of interrupt needs to be greater than 0");
@@ -427,9 +442,19 @@ static const TypeInfo xive_source_info = {
     .class_init    = xive_source_class_init,
 };
 
+/*
+ * XIVE Fabric
+ */
+static const TypeInfo xive_fabric_info = {
+    .name = TYPE_XIVE_FABRIC,
+    .parent = TYPE_INTERFACE,
+    .class_size = sizeof(XiveFabricClass),
+};
+
 static void xive_register_types(void)
 {
     type_register_static(&xive_source_info);
+    type_register_static(&xive_fabric_info);
 }
 
 type_init(xive_register_types)
-- 
2.13.6