block: List anonymous device BBs in query-block
[qemu/kevin.git] / trace / control-target.c
blob4e361019974703d089982028ae93100ece6e10d0
1 /*
2 * Interface for configuring and controlling the state of tracing events.
4 * Copyright (C) 2014-2017 LluĂ­s Vilanova <vilanova@ac.upc.edu>
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 */
10 #include "qemu/osdep.h"
11 #include "cpu.h"
12 #include "trace-root.h"
13 #include "trace/control.h"
14 #include "translate-all.h"
17 void trace_event_set_state_dynamic_init(TraceEvent *ev, bool state)
19 bool state_pre;
20 assert(trace_event_get_state_static(ev));
22 * We ignore the "vcpu" property here, since no vCPUs have been created
23 * yet. Then dstate can only be 1 or 0.
25 state_pre = *ev->dstate;
26 if (state_pre != state) {
27 if (state) {
28 trace_events_enabled_count++;
29 *ev->dstate = 1;
30 } else {
31 trace_events_enabled_count--;
32 *ev->dstate = 0;
37 void trace_event_set_state_dynamic(TraceEvent *ev, bool state)
39 CPUState *vcpu;
40 assert(trace_event_get_state_static(ev));
41 if (trace_event_is_vcpu(ev) && likely(first_cpu != NULL)) {
42 CPU_FOREACH(vcpu) {
43 trace_event_set_vcpu_state_dynamic(vcpu, ev, state);
45 } else {
47 * Without the "vcpu" property, dstate can only be 1 or 0. With it, we
48 * haven't instantiated any vCPU yet, so we will set a global state
49 * instead, and trace_init_vcpu will reconcile it afterwards.
51 bool state_pre = *ev->dstate;
52 if (state_pre != state) {
53 if (state) {
54 trace_events_enabled_count++;
55 *ev->dstate = 1;
56 } else {
57 trace_events_enabled_count--;
58 *ev->dstate = 0;
64 static void trace_event_synchronize_vcpu_state_dynamic(
65 CPUState *vcpu, run_on_cpu_data ignored)
67 bitmap_copy(vcpu->trace_dstate, vcpu->trace_dstate_delayed,
68 CPU_TRACE_DSTATE_MAX_EVENTS);
69 cpu_tb_jmp_cache_clear(vcpu);
72 void trace_event_set_vcpu_state_dynamic(CPUState *vcpu,
73 TraceEvent *ev, bool state)
75 uint32_t vcpu_id;
76 bool state_pre;
77 assert(trace_event_get_state_static(ev));
78 assert(trace_event_is_vcpu(ev));
79 vcpu_id = trace_event_get_vcpu_id(ev);
80 state_pre = test_bit(vcpu_id, vcpu->trace_dstate);
81 if (state_pre != state) {
82 if (state) {
83 trace_events_enabled_count++;
84 set_bit(vcpu_id, vcpu->trace_dstate_delayed);
85 (*ev->dstate)++;
86 } else {
87 trace_events_enabled_count--;
88 clear_bit(vcpu_id, vcpu->trace_dstate_delayed);
89 (*ev->dstate)--;
92 * Delay changes until next TB; we want all TBs to be built from a
93 * single set of dstate values to ensure consistency of generated
94 * tracing code.
96 async_run_on_cpu(vcpu, trace_event_synchronize_vcpu_state_dynamic,
97 RUN_ON_CPU_NULL);
101 static bool adding_first_cpu1(void)
103 CPUState *cpu;
104 size_t count = 0;
105 CPU_FOREACH(cpu) {
106 count++;
107 if (count > 1) {
108 return false;
111 return true;
114 static bool adding_first_cpu(void)
116 bool res;
117 cpu_list_lock();
118 res = adding_first_cpu1();
119 cpu_list_unlock();
120 return res;
123 void trace_init_vcpu(CPUState *vcpu)
125 TraceEventIter iter;
126 TraceEvent *ev;
127 trace_event_iter_init(&iter, NULL);
128 while ((ev = trace_event_iter_next(&iter)) != NULL) {
129 if (trace_event_is_vcpu(ev) &&
130 trace_event_get_state_static(ev) &&
131 trace_event_get_state_dynamic(ev)) {
132 if (adding_first_cpu()) {
133 /* check preconditions */
134 assert(*ev->dstate == 1);
135 /* disable early-init state ... */
136 *ev->dstate = 0;
137 trace_events_enabled_count--;
138 /* ... and properly re-enable */
139 trace_event_set_vcpu_state_dynamic(vcpu, ev, true);
140 } else {
141 trace_event_set_vcpu_state_dynamic(vcpu, ev, true);
145 trace_guest_cpu_enter(vcpu);