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Lluís Vilanova48151852016-07-11 12:53:41 +02001/*
2 * Interface for configuring and controlling the state of tracing events.
3 *
Lluís Vilanovaf5956d72017-06-25 14:08:38 +03004 * Copyright (C) 2014-2017 Lluís Vilanova <vilanova@ac.upc.edu>
Lluís Vilanova48151852016-07-11 12:53:41 +02005 *
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 "cpu.h"
Daniel P. Berrange0ab8ed12017-01-25 16:14:15 +000012#include "trace-root.h"
Lluís Vilanova48151852016-07-11 12:53:41 +020013#include "trace/control.h"
Lluís Vilanova48151852016-07-11 12:53:41 +020014
15
Lluís Vilanovaa4d50b12016-08-23 10:58:52 +020016void trace_event_set_state_dynamic_init(TraceEvent *ev, bool state)
17{
Lluís Vilanova8eb1b9d2016-08-23 10:58:58 +020018 bool state_pre;
Lluís Vilanovaa4d50b12016-08-23 10:58:52 +020019 assert(trace_event_get_state_static(ev));
Lluís Vilanova8eb1b9d2016-08-23 10:58:58 +020020 /*
21 * We ignore the "vcpu" property here, since no vCPUs have been created
22 * yet. Then dstate can only be 1 or 0.
23 */
Daniel P. Berrange93977402016-10-04 14:35:45 +010024 state_pre = *ev->dstate;
Lluís Vilanova8eb1b9d2016-08-23 10:58:58 +020025 if (state_pre != state) {
26 if (state) {
27 trace_events_enabled_count++;
Daniel P. Berrange93977402016-10-04 14:35:45 +010028 *ev->dstate = 1;
Lluís Vilanova8eb1b9d2016-08-23 10:58:58 +020029 } else {
30 trace_events_enabled_count--;
Daniel P. Berrange93977402016-10-04 14:35:45 +010031 *ev->dstate = 0;
Lluís Vilanova8eb1b9d2016-08-23 10:58:58 +020032 }
33 }
Lluís Vilanovaa4d50b12016-08-23 10:58:52 +020034}
35
Lluís Vilanova48151852016-07-11 12:53:41 +020036void trace_event_set_state_dynamic(TraceEvent *ev, bool state)
37{
38 CPUState *vcpu;
39 assert(trace_event_get_state_static(ev));
Lluís Vilanovaf5956d72017-06-25 14:08:38 +030040 if (trace_event_is_vcpu(ev) && likely(first_cpu != NULL)) {
Lluís Vilanova48151852016-07-11 12:53:41 +020041 CPU_FOREACH(vcpu) {
42 trace_event_set_vcpu_state_dynamic(vcpu, ev, state);
43 }
44 } else {
Lluís Vilanovaf5956d72017-06-25 14:08:38 +030045 /*
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.
49 */
Daniel P. Berrange93977402016-10-04 14:35:45 +010050 bool state_pre = *ev->dstate;
Lluís Vilanova8eb1b9d2016-08-23 10:58:58 +020051 if (state_pre != state) {
52 if (state) {
53 trace_events_enabled_count++;
Daniel P. Berrange93977402016-10-04 14:35:45 +010054 *ev->dstate = 1;
Lluís Vilanova8eb1b9d2016-08-23 10:58:58 +020055 } else {
56 trace_events_enabled_count--;
Daniel P. Berrange93977402016-10-04 14:35:45 +010057 *ev->dstate = 0;
Lluís Vilanova8eb1b9d2016-08-23 10:58:58 +020058 }
59 }
Lluís Vilanova48151852016-07-11 12:53:41 +020060 }
61}
62
Lluís Vilanovad4381112017-07-04 10:38:26 +020063static void trace_event_synchronize_vcpu_state_dynamic(
64 CPUState *vcpu, run_on_cpu_data ignored)
65{
66 bitmap_copy(vcpu->trace_dstate, vcpu->trace_dstate_delayed,
67 CPU_TRACE_DSTATE_MAX_EVENTS);
Lluís Vilanova61a67f72017-07-04 10:42:32 +020068 cpu_tb_jmp_cache_clear(vcpu);
Lluís Vilanovad4381112017-07-04 10:38:26 +020069}
70
Lluís Vilanova48151852016-07-11 12:53:41 +020071void trace_event_set_vcpu_state_dynamic(CPUState *vcpu,
72 TraceEvent *ev, bool state)
73{
Daniel P. Berrangeef4c9fc2016-10-04 14:35:49 +010074 uint32_t vcpu_id;
Lluís Vilanova48151852016-07-11 12:53:41 +020075 bool state_pre;
76 assert(trace_event_get_state_static(ev));
77 assert(trace_event_is_vcpu(ev));
Lluís Vilanova48151852016-07-11 12:53:41 +020078 vcpu_id = trace_event_get_vcpu_id(ev);
79 state_pre = test_bit(vcpu_id, vcpu->trace_dstate);
80 if (state_pre != state) {
81 if (state) {
82 trace_events_enabled_count++;
Lluís Vilanovad4381112017-07-04 10:38:26 +020083 set_bit(vcpu_id, vcpu->trace_dstate_delayed);
Daniel P. Berrange93977402016-10-04 14:35:45 +010084 (*ev->dstate)++;
Lluís Vilanova48151852016-07-11 12:53:41 +020085 } else {
86 trace_events_enabled_count--;
Lluís Vilanovad4381112017-07-04 10:38:26 +020087 clear_bit(vcpu_id, vcpu->trace_dstate_delayed);
Daniel P. Berrange93977402016-10-04 14:35:45 +010088 (*ev->dstate)--;
Lluís Vilanova48151852016-07-11 12:53:41 +020089 }
Lluís Vilanovaf99b38f2017-09-13 01:50:25 +030090 if (vcpu->created) {
91 /*
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.
95 */
96 async_run_on_cpu(vcpu, trace_event_synchronize_vcpu_state_dynamic,
97 RUN_ON_CPU_NULL);
98 } else {
99 trace_event_synchronize_vcpu_state_dynamic(vcpu, RUN_ON_CPU_NULL);
100 }
Lluís Vilanova48151852016-07-11 12:53:41 +0200101 }
102}
Lluís Vilanova2bfe11c2016-09-19 14:55:07 +0200103
Lluís Vilanovafff895d2016-12-26 22:24:35 +0100104static bool adding_first_cpu1(void)
Lluís Vilanova2bfe11c2016-09-19 14:55:07 +0200105{
106 CPUState *cpu;
107 size_t count = 0;
108 CPU_FOREACH(cpu) {
109 count++;
110 if (count > 1) {
111 return false;
112 }
113 }
114 return true;
115}
116
Lluís Vilanovafff895d2016-12-26 22:24:35 +0100117static bool adding_first_cpu(void)
118{
119 bool res;
120 cpu_list_lock();
121 res = adding_first_cpu1();
122 cpu_list_unlock();
123 return res;
124}
125
Lluís Vilanova2bfe11c2016-09-19 14:55:07 +0200126void trace_init_vcpu(CPUState *vcpu)
127{
Daniel P. Berrange0d4e9952016-10-04 14:35:43 +0100128 TraceEventIter iter;
129 TraceEvent *ev;
130 trace_event_iter_init(&iter, NULL);
131 while ((ev = trace_event_iter_next(&iter)) != NULL) {
Lluís Vilanova2bfe11c2016-09-19 14:55:07 +0200132 if (trace_event_is_vcpu(ev) &&
133 trace_event_get_state_static(ev) &&
134 trace_event_get_state_dynamic(ev)) {
Lluís Vilanova2bfe11c2016-09-19 14:55:07 +0200135 if (adding_first_cpu()) {
136 /* check preconditions */
Daniel P. Berrange93977402016-10-04 14:35:45 +0100137 assert(*ev->dstate == 1);
Lluís Vilanova2bfe11c2016-09-19 14:55:07 +0200138 /* disable early-init state ... */
Daniel P. Berrange93977402016-10-04 14:35:45 +0100139 *ev->dstate = 0;
Lluís Vilanova2bfe11c2016-09-19 14:55:07 +0200140 trace_events_enabled_count--;
141 /* ... and properly re-enable */
142 trace_event_set_vcpu_state_dynamic(vcpu, ev, true);
143 } else {
144 trace_event_set_vcpu_state_dynamic(vcpu, ev, true);
145 }
146 }
147 }
Lluís Vilanovab9d72212016-09-19 14:55:13 +0200148 trace_guest_cpu_enter(vcpu);
Lluís Vilanova2bfe11c2016-09-19 14:55:07 +0200149}