[Qemu-devel] [RFC PATCH v5 1/6] qdev : add a maximum device allowed field for the bus.

[fred.konrad@greensocs.com]

From: KONRAD Frederic <fred.konrad@greensocs.com>

Add a max_dev field to BusState to specify the maximum amount of devices allowed
on the bus ( have no effect if max_dev=0 )

Signed-off-by: KONRAD Frederic <fred.konrad@greensocs.com>
---
 hw/qdev-core.h    |  2 ++
 hw/qdev-monitor.c | 11 +++++++++++
 2 files changed, 13 insertions(+)

diff --git a/hw/qdev-core.h b/hw/qdev-core.h
index fff7f0f..ee4becd 100644
--- a/hw/qdev-core.h
+++ b/hw/qdev-core.h
@@ -113,6 +113,8 @@ struct BusState {
     const char *name;
     int allow_hotplug;
     int max_index;
+    /* maximum devices allowed on the bus, 0 : no limit. */
+    int max_dev;
     QTAILQ_HEAD(ChildrenHead, BusChild) children;
     QLIST_ENTRY(BusState) sibling;
 };
diff --git a/hw/qdev-monitor.c b/hw/qdev-monitor.c
index a1b4d6a..7a9d275 100644
--- a/hw/qdev-monitor.c
+++ b/hw/qdev-monitor.c
@@ -292,6 +292,17 @@ static BusState *qbus_find_recursive(BusState *bus, const char *name,
     if (bus_typename && !object_dynamic_cast(OBJECT(bus), bus_typename)) {
         match = 0;
     }
+    if ((bus->max_dev != 0) && (bus->max_dev <= bus->max_index)) {
+        if (name != NULL) {
+            /* bus was explicitly specified : return an error. */
+            qerror_report(ERROR_CLASS_GENERIC_ERROR, "Bus '%s' is full",
+                          bus->name);
+            return NULL;
+        } else {
+            /* bus was not specified : try to find another one. */
+            match = 0;
+        }
+    }
     if (match) {
         return bus;
     }
-- 
1.7.11.7