input: add input_mouse_mode tracepoint

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

trace-events

diff --git a/trace-events b/trace-events
index fcdd570..744563c 100644
--- a/trace-events
+++ b/trace-events
@@ -1027,6 +1027,7 @@
 input_event_rel(int conidx, const char *axis, int value) "con %d, axis %s, value %d"
 input_event_abs(int conidx, const char *axis, int value) "con %d, axis %s, value 0x%x"
 input_event_sync(void) ""
+input_mouse_mode(int absolute) "absolute %d"
 
 # hw/display/vmware_vga.c
 vmware_value_read(uint32_t index, uint32_t value) "index %d, value 0x%x"

ui/input.c

diff --git a/ui/input.c b/ui/input.c
index b8fc681..afc037c 100644
--- a/ui/input.c
+++ b/ui/input.c
@@ -289,6 +289,7 @@
     is_absolute = qemu_input_is_absolute();
 
     if (is_absolute != current_is_absolute) {
+        trace_input_mouse_mode(is_absolute);
         notifier_list_notify(&mouse_mode_notifiers, NULL);
     }