Import QEMU upstream snapshot d2e570c

Upstream: https://gitlab.com/qemu-project/qemu.git

Upstream-Commit: d2e570cc0f97b936902a5b1b86b73c0f5998b475

trace/qmp.c

@@ -0,0 +1,108 @@
+/*
+ * QMP commands for tracing events.
+ *
+ * Copyright (C) 2014-2016 Lluís Vilanova <[email protected]>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "qapi/qapi-commands-trace.h"
+#include "control.h"
+
+
+static bool check_events(bool ignore_unavailable, bool is_pattern,
+                         const char *name, Error **errp)
+{
+    if (!is_pattern) {
+        TraceEvent *ev = trace_event_name(name);
+
+        /* error for non-existing event */
+        if (ev == NULL) {
+            error_setg(errp, "unknown event \"%s\"", name);
+            return false;
+        }
+
+        /* error for unavailable event */
+        if (!ignore_unavailable && !trace_event_get_state_static(ev)) {
+            error_setg(errp, "event \"%s\" is disabled", name);
+            return false;
+        }
+
+        return true;
+    } else {
+        /* error for unavailable events */
+        TraceEventIter iter;
+        TraceEvent *ev;
+        trace_event_iter_init_pattern(&iter, name);
+        while ((ev = trace_event_iter_next(&iter)) != NULL) {
+            if (!ignore_unavailable && !trace_event_get_state_static(ev)) {
+                error_setg(errp, "event \"%s\" is disabled", trace_event_get_name(ev));
+                return false;
+            }
+        }
+        return true;
+    }
+}
+
+TraceEventInfoList *qmp_trace_event_get_state(const char *name,
+                                              Error **errp)
+{
+    TraceEventInfoList *events = NULL;
+    TraceEventIter iter;
+    TraceEvent *ev;
+    bool is_pattern = trace_event_is_pattern(name);
+
+    /* Check events */
+    if (!check_events(true, is_pattern, name, errp)) {
+        return NULL;
+    }
+
+    /* Get states (all errors checked above) */
+    trace_event_iter_init_pattern(&iter, name);
+    while ((ev = trace_event_iter_next(&iter)) != NULL) {
+        TraceEventInfo *value;
+
+        value = g_new(TraceEventInfo, 1);
+        value->name = g_strdup(trace_event_get_name(ev));
+
+        if (!trace_event_get_state_static(ev)) {
+            value->state = TRACE_EVENT_STATE_UNAVAILABLE;
+        } else {
+            if (trace_event_get_state_dynamic(ev)) {
+                value->state = TRACE_EVENT_STATE_ENABLED;
+            } else {
+                value->state = TRACE_EVENT_STATE_DISABLED;
+            }
+        }
+        QAPI_LIST_PREPEND(events, value);
+    }
+
+    return events;
+}
+
+void qmp_trace_event_set_state(const char *name, bool enable,
+                               bool has_ignore_unavailable, bool ignore_unavailable,
+                               Error **errp)
+{
+    TraceEventIter iter;
+    TraceEvent *ev;
+    bool is_pattern = trace_event_is_pattern(name);
+
+    /* Check events */
+    if (!check_events(has_ignore_unavailable && ignore_unavailable,
+                      is_pattern, name, errp)) {
+        return;
+    }
+
+    /* Apply changes (all errors checked above) */
+    trace_event_iter_init_pattern(&iter, name);
+    while ((ev = trace_event_iter_next(&iter)) != NULL) {
+        if (!trace_event_get_state_static(ev)) {
+            continue;
+        }
+        trace_event_set_state_dynamic(ev, enable);
+    }
+}