Add a tracepoint for creations of qdev.  This can be used to see what devices
are created under the hood, along with the ordering of their creation.

Signed-off-by: Peter Xu <peterx@redhat.com>
---
 softmmu/qdev-monitor.c | 2 ++
 softmmu/trace-events   | 3 +++
 2 files changed, 5 insertions(+)

diff --git a/softmmu/qdev-monitor.c b/softmmu/qdev-monitor.c
index 721dec2d82..8602164082 100644
--- a/softmmu/qdev-monitor.c
+++ b/softmmu/qdev-monitor.c
@@ -40,6 +40,7 @@
 #include "qemu/cutils.h"
 #include "hw/qdev-properties.h"
 #include "hw/clock.h"
+#include "trace.h"
 
 /*
  * Aliases were a bad idea from the start.  Let's keep them
@@ -674,6 +675,7 @@ DeviceState *qdev_device_add(QemuOpts *opts, Error **errp)
         dev->opts = NULL;
         goto err_del_dev;
     }
+    trace_qdev_device_add(driver, qemu_opts_id(opts));
     return dev;
 
 err_del_dev:
diff --git a/softmmu/trace-events b/softmmu/trace-events
index 7b278590a0..fad85e9d5c 100644
--- a/softmmu/trace-events
+++ b/softmmu/trace-events
@@ -29,3 +29,6 @@ runstate_set(int current_state, const char *current_state_str, int new_state, co
 system_wakeup_request(int reason) "reason=%d"
 qemu_system_shutdown_request(int reason) "reason=%d"
 qemu_system_powerdown_request(void) ""
+
+# qdev-monitor.c
+qdev_device_add(const char *driver, const char *id) "driver '%s' id '%s'"
-- 
2.31.1