| 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.h" |
| 14 | |
| 15 | |
| 16 | static bool check_events(bool ignore_unavailable, bool is_pattern, |
| 17 | const char *name, Error **errp) |
| 18 | { |
| 19 | if (!is_pattern) { |
| 20 | TraceEvent *ev = trace_event_name(name); |
| 21 | |
| 22 | /* error for non-existing event */ |
| 23 | if (ev == NULL) { |
| 24 | error_setg(errp, "unknown event \"%s\"", name); |
| 25 | return false; |
| 26 | } |
| 27 | |
| 28 | /* error for unavailable event */ |
| 29 | if (!ignore_unavailable && !trace_event_get_state_static(ev)) { |
| 30 | error_setg(errp, "event \"%s\" is disabled", name); |
| 31 | return false; |
| 32 | } |
| 33 | |
| 34 | return true; |
| 35 | } else { |
| 36 | /* error for unavailable events */ |
| 37 | TraceEventIter iter; |
| 38 | TraceEvent *ev; |
| 39 | trace_event_iter_init_pattern(&iter, name); |
| 40 | while ((ev = trace_event_iter_next(&iter)) != NULL) { |
| 41 | if (!ignore_unavailable && !trace_event_get_state_static(ev)) { |
| 42 | error_setg(errp, "event \"%s\" is disabled", trace_event_get_name(ev)); |
| 43 | return false; |
| 44 | } |
| 45 | } |
| 46 | return true; |
| 47 | } |
| 48 | } |
| 49 | |
| 50 | TraceEventInfoList *qmp_trace_event_get_state(const char *name, |
| 51 | Error **errp) |
| 52 | { |
| 53 | TraceEventInfoList *events = NULL; |
| 54 | TraceEventIter iter; |
| 55 | TraceEvent *ev; |
| 56 | bool is_pattern = trace_event_is_pattern(name); |
| 57 | |
| 58 | /* Check events */ |
| 59 | if (!check_events(true, is_pattern, name, errp)) { |
| 60 | return NULL; |
| 61 | } |
| 62 | |
| 63 | /* Get states (all errors checked above) */ |
| 64 | trace_event_iter_init_pattern(&iter, name); |
| 65 | while ((ev = trace_event_iter_next(&iter)) != NULL) { |
| 66 | TraceEventInfo *value; |
| 67 | |
| 68 | value = g_new(TraceEventInfo, 1); |
| 69 | value->name = g_strdup(trace_event_get_name(ev)); |
| 70 | |
| 71 | if (!trace_event_get_state_static(ev)) { |
| 72 | value->state = TRACE_EVENT_STATE_UNAVAILABLE; |
| 73 | } else { |
| 74 | if (trace_event_get_state_dynamic(ev)) { |
| 75 | value->state = TRACE_EVENT_STATE_ENABLED; |
| 76 | } else { |
| 77 | value->state = TRACE_EVENT_STATE_DISABLED; |
| 78 | } |
| 79 | } |
| 80 | QAPI_LIST_PREPEND(events, value); |
| 81 | } |
| 82 | |
| 83 | return events; |
| 84 | } |
| 85 | |
| 86 | void qmp_trace_event_set_state(const char *name, bool enable, |
| 87 | bool has_ignore_unavailable, bool ignore_unavailable, |
| 88 | Error **errp) |
| 89 | { |
| 90 | TraceEventIter iter; |
| 91 | TraceEvent *ev; |
| 92 | bool is_pattern = trace_event_is_pattern(name); |
| 93 | |
| 94 | /* Check events */ |
| 95 | if (!check_events(has_ignore_unavailable && ignore_unavailable, |
| 96 | is_pattern, name, errp)) { |
| 97 | return; |
| 98 | } |
| 99 | |
| 100 | /* Apply changes (all errors checked above) */ |
| 101 | trace_event_iter_init_pattern(&iter, name); |
| 102 | while ((ev = trace_event_iter_next(&iter)) != NULL) { |
| 103 | if (!trace_event_get_state_static(ev)) { |
| 104 | continue; |
| 105 | } |
| 106 | trace_event_set_state_dynamic(ev, enable); |
| 107 | } |
| 108 | } |