[Qemu-devel] [PATCH v2] sysbus: add irq_routing_notifier

[Eric Auger <eric.auger@linaro.org>]

Add a new irq_routing_notifier notifier in the SysBusDeviceClass. This
notifier, if populated, is called after sysbus_connect_irq.

This mechanism is used to setup VFIO signaling once VFIO platform
devices get attached to their platform bus, on a machine init done
notifier.

Signed-off-by: Eric Auger <eric.auger@linaro.org>

---

v1 -> v2:
- duly put the notifier in the class and not in the device
---
 hw/core/sysbus.c    | 6 ++++++
 include/hw/sysbus.h | 1 +
 2 files changed, 7 insertions(+)

diff --git a/hw/core/sysbus.c b/hw/core/sysbus.c
index b53c351..8553a6f 100644
--- a/hw/core/sysbus.c
+++ b/hw/core/sysbus.c
@@ -109,7 +109,13 @@ qemu_irq sysbus_get_connected_irq(SysBusDevice *dev, int n)
 
 void sysbus_connect_irq(SysBusDevice *dev, int n, qemu_irq irq)
 {
+    SysBusDeviceClass *sbd = SYS_BUS_DEVICE_GET_CLASS(dev);
+
     qdev_connect_gpio_out_named(DEVICE(dev), SYSBUS_DEVICE_GPIO_IRQ, n, irq);
+
+    if (sbd->irq_routing_notifier) {
+        sbd->irq_routing_notifier(dev, irq);
+    }
 }
 
 /* Check whether an MMIO region exists */
diff --git a/include/hw/sysbus.h b/include/hw/sysbus.h
index d1f3f00..dbf3f0f 100644
--- a/include/hw/sysbus.h
+++ b/include/hw/sysbus.h
@@ -41,6 +41,7 @@ typedef struct SysBusDeviceClass {
     /*< public >*/
 
     int (*init)(SysBusDevice *dev);
+    void (*irq_routing_notifier)(SysBusDevice *dev, qemu_irq irq);
 } SysBusDeviceClass;
 
 struct SysBusDevice {
-- 
1.8.3.2