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.
10 #include "qemu/osdep.h"
12 #include "trace/trace-root.h"
13 #include "trace/control.h"
16 void trace_event_set_state_dynamic_init(TraceEvent *ev, bool state)
19 assert(trace_event_get_state_static(ev));
21 * We ignore the "vcpu" property here, since no vCPUs have been created
22 * yet. Then dstate can only be 1 or 0.
24 state_pre = *ev->dstate;
25 if (state_pre != state) {
27 trace_events_enabled_count++;
30 trace_events_enabled_count--;
36 void trace_event_set_state_dynamic(TraceEvent *ev, bool state)
39 assert(trace_event_get_state_static(ev));
40 if (trace_event_is_vcpu(ev) && likely(first_cpu != NULL)) {
42 trace_event_set_vcpu_state_dynamic(vcpu, ev, state);
46 * Without the "vcpu" property, dstate can only be 1 or 0. With it, we
47 * haven't instantiated any vCPU yet, so we will set a global state
48 * instead, and trace_init_vcpu will reconcile it afterwards.
50 bool state_pre = *ev->dstate;
51 if (state_pre != state) {
53 trace_events_enabled_count++;
56 trace_events_enabled_count--;
63 static void trace_event_synchronize_vcpu_state_dynamic(
64 CPUState *vcpu, run_on_cpu_data ignored)
66 bitmap_copy(vcpu->trace_dstate, vcpu->trace_dstate_delayed,
67 CPU_TRACE_DSTATE_MAX_EVENTS);
68 cpu_tb_jmp_cache_clear(vcpu);
71 void trace_event_set_vcpu_state_dynamic(CPUState *vcpu,
72 TraceEvent *ev, bool state)
76 assert(trace_event_get_state_static(ev));
77 assert(trace_event_is_vcpu(ev));
78 vcpu_id = trace_event_get_vcpu_id(ev);
79 state_pre = test_bit(vcpu_id, vcpu->trace_dstate);
80 if (state_pre != state) {
82 trace_events_enabled_count++;
83 set_bit(vcpu_id, vcpu->trace_dstate_delayed);
86 trace_events_enabled_count--;
87 clear_bit(vcpu_id, vcpu->trace_dstate_delayed);
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
96 async_run_on_cpu(vcpu, trace_event_synchronize_vcpu_state_dynamic,
99 trace_event_synchronize_vcpu_state_dynamic(vcpu, RUN_ON_CPU_NULL);
104 static bool adding_first_cpu1(void)
117 static bool adding_first_cpu(void)
121 res = adding_first_cpu1();
126 void trace_init_vcpu(CPUState *vcpu)
130 trace_event_iter_init(&iter, NULL);
131 while ((ev = trace_event_iter_next(&iter)) != NULL) {
132 if (trace_event_is_vcpu(ev) &&
133 trace_event_get_state_static(ev) &&
134 trace_event_get_state_dynamic(ev)) {
135 if (adding_first_cpu()) {
136 /* check preconditions */
137 assert(*ev->dstate == 1);
138 /* disable early-init state ... */
140 trace_events_enabled_count--;
141 /* ... and properly re-enable */
142 trace_event_set_vcpu_state_dynamic(vcpu, ev, true);
144 trace_event_set_vcpu_state_dynamic(vcpu, ev, true);
148 trace_guest_cpu_enter(vcpu);