1 /*
2 * Interface for configuring and controlling the state of tracing events.
3 *
4 * Copyright (C) 2014-2017 Lluís Vilanova <vilanova@ac.upc.edu>
5 *
6 * This work is licensed under the terms of the GNU GPL, version 2 or later.
7 * See the COPYING file in the top-level directory.
8 */
9
10 #include "qemu/osdep.h"
11 #include "trace/control.h"
12
13
trace_event_set_state_dynamic_init(TraceEvent * ev,bool state)14 void trace_event_set_state_dynamic_init(TraceEvent *ev, bool state)
15 {
16 bool state_pre;
17 assert(trace_event_get_state_static(ev));
18 /*
19 * We ignore the "vcpu" property here, since no vCPUs have been created
20 * yet. Then dstate can only be 1 or 0.
21 */
22 state_pre = *ev->dstate;
23 if (state_pre != state) {
24 if (state) {
25 trace_events_enabled_count++;
26 *ev->dstate = 1;
27 } else {
28 trace_events_enabled_count--;
29 *ev->dstate = 0;
30 }
31 }
32 }
33
trace_event_set_state_dynamic(TraceEvent * ev,bool state)34 void trace_event_set_state_dynamic(TraceEvent *ev, bool state)
35 {
36 assert(trace_event_get_state_static(ev));
37
38 /*
39 * There is no longer a "vcpu" property, dstate can only be 1 or
40 * 0. With it, we haven't instantiated any vCPU yet, so we will
41 * set a global state instead, and trace_init_vcpu will reconcile
42 * it afterwards.
43 */
44 bool state_pre = *ev->dstate;
45 if (state_pre != state) {
46 if (state) {
47 trace_events_enabled_count++;
48 *ev->dstate = 1;
49 } else {
50 trace_events_enabled_count--;
51 *ev->dstate = 0;
52 }
53 }
54 }
55