[Qemu-devel] [PATCH v6 03/37] ppc/xive: introduce the XiveNotifier interface

["Cédric Le Goater" <clg@kaod.org>]

The XiveNotifier 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 <clg@kaod.org>
---
 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 7cebc32eba4c..6770cffec67d 100644
--- a/include/hw/ppc/xive.h
+++ b/include/hw/ppc/xive.h
@@ -142,6 +142,27 @@
 
 #include "hw/qdev-core.h"
 
+/*
+ * XIVE Fabric (Interface between Source and Router)
+ */
+
+typedef struct XiveNotifier {
+    Object parent;
+} XiveNotifier;
+
+#define TYPE_XIVE_NOTIFIER "xive-fabric"
+#define XIVE_NOTIFIER(obj)                                     \
+    OBJECT_CHECK(XiveNotifier, (obj), TYPE_XIVE_NOTIFIER)
+#define XIVE_NOTIFIER_CLASS(klass)                                     \
+    OBJECT_CLASS_CHECK(XiveNotifierClass, (klass), TYPE_XIVE_NOTIFIER)
+#define XIVE_NOTIFIER_GET_CLASS(obj)                                   \
+    OBJECT_GET_CLASS(XiveNotifierClass, (obj), TYPE_XIVE_NOTIFIER)
+
+typedef struct XiveNotifierClass {
+    InterfaceClass parent;
+    void (*notify)(XiveNotifier *xn, uint32_t lisn);
+} XiveNotifierClass;
+
 /*
  * XIVE Interrupt Source
  */
@@ -171,6 +192,8 @@ typedef struct XiveSource {
     uint64_t        esb_flags;
     uint32_t        esb_shift;
     MemoryRegion    esb_mmio;
+
+    XiveNotifier    *xive;
 } XiveSource;
 
 /*
diff --git a/hw/intc/xive.c b/hw/intc/xive.c
index 11c7aac962de..79238eb57fae 100644
--- a/hw/intc/xive.c
+++ b/hw/intc/xive.c
@@ -155,7 +155,11 @@ static bool xive_source_esb_eoi(XiveSource *xsrc, uint32_t srcno)
  */
 static void xive_source_notify(XiveSource *xsrc, int srcno)
 {
+    XiveNotifierClass *xnc = XIVE_NOTIFIER_GET_CLASS(xsrc->xive);
 
+    if (xnc->notify) {
+        xnc->notify(xsrc->xive, srcno);
+    }
 }
 
 /*
@@ -362,6 +366,17 @@ static void xive_source_reset(void *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_NOTIFIER(obj);
 
     if (!xsrc->nr_irqs) {
         error_setg(errp, "Number of interrupt needs to be greater than 0");
@@ -428,9 +443,19 @@ static const TypeInfo xive_source_info = {
     .class_init    = xive_source_class_init,
 };
 
+/*
+ * XIVE Fabric
+ */
+static const TypeInfo xive_fabric_info = {
+    .name = TYPE_XIVE_NOTIFIER,
+    .parent = TYPE_INTERFACE,
+    .class_size = sizeof(XiveNotifierClass),
+};
+
 static void xive_register_types(void)
 {
     type_register_static(&xive_source_info);
+    type_register_static(&xive_fabric_info);
 }
 
 type_init(xive_register_types)
-- 
2.17.2