1/*
2 * QMP commands for tracing events.
3 *
4 * Copyright (C) 2014-2016 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 "qapi/error.h"
12#include "qapi/qapi-commands-trace.h"
13#include "control-vcpu.h"
14
15
16static CPUState *get_cpu(bool has_vcpu, int vcpu, Error **errp)
17{
18 if (has_vcpu) {
19 CPUState *cpu = qemu_get_cpu(vcpu);
20 if (cpu == NULL) {
21 error_setg(errp, "invalid vCPU index %u", vcpu);
22 }
23 return cpu;
24 } else {
25 return NULL;
26 }
27}
28
29static bool check_events(bool has_vcpu, bool ignore_unavailable, bool is_pattern,
30 const char *name, Error **errp)
31{
32 if (!is_pattern) {
33 TraceEvent *ev = trace_event_name(name);
34
35 /* error for non-existing event */
36 if (ev == NULL) {
37 error_setg(errp, "unknown event \"%s\"", name);
38 return false;
39 }
40
41 /* error for non-vcpu event */
42 if (has_vcpu && !trace_event_is_vcpu(ev)) {
43 error_setg(errp, "event \"%s\" is not vCPU-specific", name);
44 return false;
45 }
46
47 /* error for unavailable event */
48 if (!ignore_unavailable && !trace_event_get_state_static(ev)) {
49 error_setg(errp, "event \"%s\" is disabled", name);
50 return false;
51 }
52
53 return true;
54 } else {
55 /* error for unavailable events */
56 TraceEventIter iter;
57 TraceEvent *ev;
58 trace_event_iter_init(&iter, name);
59 while ((ev = trace_event_iter_next(&iter)) != NULL) {
60 if (!ignore_unavailable && !trace_event_get_state_static(ev)) {
61 error_setg(errp, "event \"%s\" is disabled", trace_event_get_name(ev));
62 return false;
63 }
64 }
65 return true;
66 }
67}
68
69TraceEventInfoList *qmp_trace_event_get_state(const char *name,
70 bool has_vcpu, int64_t vcpu,
71 Error **errp)
72{
73 Error *err = NULL;
74 TraceEventInfoList *events = NULL;
75 TraceEventIter iter;
76 TraceEvent *ev;
77 bool is_pattern = trace_event_is_pattern(name);
78 CPUState *cpu;
79
80 /* Check provided vcpu */
81 cpu = get_cpu(has_vcpu, vcpu, &err);
82 if (err) {
83 error_propagate(errp, err);
84 return NULL;
85 }
86
87 /* Check events */
88 if (!check_events(has_vcpu, true, is_pattern, name, errp)) {
89 return NULL;
90 }
91
92 /* Get states (all errors checked above) */
93 trace_event_iter_init(&iter, name);
94 while ((ev = trace_event_iter_next(&iter)) != NULL) {
95 TraceEventInfoList *elem;
96 bool is_vcpu = trace_event_is_vcpu(ev);
97 if (has_vcpu && !is_vcpu) {
98 continue;
99 }
100
101 elem = g_new(TraceEventInfoList, 1);
102 elem->value = g_new(TraceEventInfo, 1);
103 elem->value->vcpu = is_vcpu;
104 elem->value->name = g_strdup(trace_event_get_name(ev));
105
106 if (!trace_event_get_state_static(ev)) {
107 elem->value->state = TRACE_EVENT_STATE_UNAVAILABLE;
108 } else {
109 if (has_vcpu) {
110 if (is_vcpu) {
111 if (trace_event_get_vcpu_state_dynamic(cpu, ev)) {
112 elem->value->state = TRACE_EVENT_STATE_ENABLED;
113 } else {
114 elem->value->state = TRACE_EVENT_STATE_DISABLED;
115 }
116 }
117 /* else: already skipped above */
118 } else {
119 if (trace_event_get_state_dynamic(ev)) {
120 elem->value->state = TRACE_EVENT_STATE_ENABLED;
121 } else {
122 elem->value->state = TRACE_EVENT_STATE_DISABLED;
123 }
124 }
125 }
126 elem->next = events;
127 events = elem;
128 }
129
130 return events;
131}
132
133void qmp_trace_event_set_state(const char *name, bool enable,
134 bool has_ignore_unavailable, bool ignore_unavailable,
135 bool has_vcpu, int64_t vcpu,
136 Error **errp)
137{
138 Error *err = NULL;
139 TraceEventIter iter;
140 TraceEvent *ev;
141 bool is_pattern = trace_event_is_pattern(name);
142 CPUState *cpu;
143
144 /* Check provided vcpu */
145 cpu = get_cpu(has_vcpu, vcpu, &err);
146 if (err) {
147 error_propagate(errp, err);
148 return;
149 }
150
151 /* Check events */
152 if (!check_events(has_vcpu, has_ignore_unavailable && ignore_unavailable,
153 is_pattern, name, errp)) {
154 return;
155 }
156
157 /* Apply changes (all errors checked above) */
158 trace_event_iter_init(&iter, name);
159 while ((ev = trace_event_iter_next(&iter)) != NULL) {
160 if (!trace_event_get_state_static(ev) ||
161 (has_vcpu && !trace_event_is_vcpu(ev))) {
162 continue;
163 }
164 if (has_vcpu) {
165 trace_event_set_vcpu_state_dynamic(cpu, ev, enable);
166 } else {
167 trace_event_set_state_dynamic(ev, enable);
168 }
169 }
170}
171