123d15e86SLluís /* 223d15e86SLluís * Interface for configuring and controlling the state of tracing events. 323d15e86SLluís * 45b808275SLluís Vilanova * Copyright (C) 2011-2014 Lluís Vilanova <vilanova@ac.upc.edu> 523d15e86SLluís * 6b1bae816SLluís Vilanova * This work is licensed under the terms of the GNU GPL, version 2 or later. 7b1bae816SLluís Vilanova * See the COPYING file in the top-level directory. 823d15e86SLluís */ 923d15e86SLluís 10d38ea87aSPeter Maydell #include "qemu/osdep.h" 1123d15e86SLluís #include "trace/control.h" 12f348b6d1SVeronia Bahaa #include "qemu/help_option.h" 135b808275SLluís Vilanova #ifdef CONFIG_TRACE_SIMPLE 145b808275SLluís Vilanova #include "trace/simple.h" 155b808275SLluís Vilanova #endif 165b808275SLluís Vilanova #ifdef CONFIG_TRACE_FTRACE 175b808275SLluís Vilanova #include "trace/ftrace.h" 185b808275SLluís Vilanova #endif 19ed7f5f1dSPaolo Bonzini #ifdef CONFIG_TRACE_LOG 20ed7f5f1dSPaolo Bonzini #include "qemu/log.h" 21ed7f5f1dSPaolo Bonzini #endif 22*daa76aa4SMarkus Armbruster #include "qapi/error.h" 23a35d9be6SAlexey Kardashevskiy #include "qemu/error-report.h" 24acc6809dSDenis V. Lunev #include "monitor/monitor.h" 2523d15e86SLluís 2643b48cfcSPaolo Bonzini int trace_events_enabled_count; 27585ec727SPaolo Bonzini bool trace_events_dstate[TRACE_EVENT_COUNT]; 2843b48cfcSPaolo Bonzini 29b1bae816SLluís Vilanova TraceEvent *trace_event_name(const char *name) 30b1bae816SLluís Vilanova { 31b1bae816SLluís Vilanova assert(name != NULL); 32b1bae816SLluís Vilanova 33b1bae816SLluís Vilanova TraceEventID i; 34b1bae816SLluís Vilanova for (i = 0; i < trace_event_count(); i++) { 35b1bae816SLluís Vilanova TraceEvent *ev = trace_event_id(i); 36b1bae816SLluís Vilanova if (strcmp(trace_event_get_name(ev), name) == 0) { 37b1bae816SLluís Vilanova return ev; 38b1bae816SLluís Vilanova } 39b1bae816SLluís Vilanova } 40b1bae816SLluís Vilanova return NULL; 41b1bae816SLluís Vilanova } 42b1bae816SLluís Vilanova 43b1bae816SLluís Vilanova static bool pattern_glob(const char *pat, const char *ev) 44b1bae816SLluís Vilanova { 45b1bae816SLluís Vilanova while (*pat != '\0' && *ev != '\0') { 46b1bae816SLluís Vilanova if (*pat == *ev) { 47b1bae816SLluís Vilanova pat++; 48b1bae816SLluís Vilanova ev++; 49b1bae816SLluís Vilanova } 50b1bae816SLluís Vilanova else if (*pat == '*') { 51b1bae816SLluís Vilanova if (pattern_glob(pat, ev+1)) { 52b1bae816SLluís Vilanova return true; 53b1bae816SLluís Vilanova } else if (pattern_glob(pat+1, ev)) { 54b1bae816SLluís Vilanova return true; 55b1bae816SLluís Vilanova } else { 56b1bae816SLluís Vilanova return false; 57b1bae816SLluís Vilanova } 58b1bae816SLluís Vilanova } else { 59b1bae816SLluís Vilanova return false; 60b1bae816SLluís Vilanova } 61b1bae816SLluís Vilanova } 62b1bae816SLluís Vilanova 63b1bae816SLluís Vilanova while (*pat == '*') { 64b1bae816SLluís Vilanova pat++; 65b1bae816SLluís Vilanova } 66b1bae816SLluís Vilanova 67b1bae816SLluís Vilanova if (*pat == '\0' && *ev == '\0') { 68b1bae816SLluís Vilanova return true; 69b1bae816SLluís Vilanova } else { 70b1bae816SLluís Vilanova return false; 71b1bae816SLluís Vilanova } 72b1bae816SLluís Vilanova } 73b1bae816SLluís Vilanova 74b1bae816SLluís Vilanova TraceEvent *trace_event_pattern(const char *pat, TraceEvent *ev) 75b1bae816SLluís Vilanova { 76b1bae816SLluís Vilanova assert(pat != NULL); 77b1bae816SLluís Vilanova 78b1bae816SLluís Vilanova TraceEventID i; 79b1bae816SLluís Vilanova 80b1bae816SLluís Vilanova if (ev == NULL) { 81b1bae816SLluís Vilanova i = -1; 82b1bae816SLluís Vilanova } else { 83b1bae816SLluís Vilanova i = trace_event_get_id(ev); 84b1bae816SLluís Vilanova } 85b1bae816SLluís Vilanova i++; 86b1bae816SLluís Vilanova 87b1bae816SLluís Vilanova while (i < trace_event_count()) { 88b1bae816SLluís Vilanova TraceEvent *res = trace_event_id(i); 89b1bae816SLluís Vilanova if (pattern_glob(pat, trace_event_get_name(res))) { 90b1bae816SLluís Vilanova return res; 91b1bae816SLluís Vilanova } 92b1bae816SLluís Vilanova i++; 93b1bae816SLluís Vilanova } 94b1bae816SLluís Vilanova 95b1bae816SLluís Vilanova return NULL; 96b1bae816SLluís Vilanova } 97b1bae816SLluís Vilanova 98e9527dd3SPaolo Bonzini void trace_list_events(void) 99e9527dd3SPaolo Bonzini { 100e9527dd3SPaolo Bonzini int i; 101e9527dd3SPaolo Bonzini for (i = 0; i < trace_event_count(); i++) { 102e9527dd3SPaolo Bonzini TraceEvent *res = trace_event_id(i); 103e9527dd3SPaolo Bonzini fprintf(stderr, "%s\n", trace_event_get_name(res)); 104e9527dd3SPaolo Bonzini } 105e9527dd3SPaolo Bonzini } 106e9527dd3SPaolo Bonzini 107e9527dd3SPaolo Bonzini static void do_trace_enable_events(const char *line_buf) 10810578a25SPaolo Bonzini { 10910578a25SPaolo Bonzini const bool enable = ('-' != line_buf[0]); 11010578a25SPaolo Bonzini const char *line_ptr = enable ? line_buf : line_buf + 1; 11110578a25SPaolo Bonzini 11210578a25SPaolo Bonzini if (trace_event_is_pattern(line_ptr)) { 11310578a25SPaolo Bonzini TraceEvent *ev = NULL; 11410578a25SPaolo Bonzini while ((ev = trace_event_pattern(line_ptr, ev)) != NULL) { 11510578a25SPaolo Bonzini if (trace_event_get_state_static(ev)) { 11610578a25SPaolo Bonzini trace_event_set_state_dynamic(ev, enable); 11710578a25SPaolo Bonzini } 11810578a25SPaolo Bonzini } 11910578a25SPaolo Bonzini } else { 12010578a25SPaolo Bonzini TraceEvent *ev = trace_event_name(line_ptr); 12110578a25SPaolo Bonzini if (ev == NULL) { 12210578a25SPaolo Bonzini error_report("WARNING: trace event '%s' does not exist", 12310578a25SPaolo Bonzini line_ptr); 12410578a25SPaolo Bonzini } else if (!trace_event_get_state_static(ev)) { 12510578a25SPaolo Bonzini error_report("WARNING: trace event '%s' is not traceable", 12610578a25SPaolo Bonzini line_ptr); 12710578a25SPaolo Bonzini } else { 12810578a25SPaolo Bonzini trace_event_set_state_dynamic(ev, enable); 12910578a25SPaolo Bonzini } 13010578a25SPaolo Bonzini } 13110578a25SPaolo Bonzini } 13210578a25SPaolo Bonzini 133e9527dd3SPaolo Bonzini void trace_enable_events(const char *line_buf) 134e9527dd3SPaolo Bonzini { 135e9527dd3SPaolo Bonzini if (is_help_option(line_buf)) { 136e9527dd3SPaolo Bonzini trace_list_events(); 137acc6809dSDenis V. Lunev if (cur_mon == NULL) { 138e9527dd3SPaolo Bonzini exit(0); 139acc6809dSDenis V. Lunev } 140e9527dd3SPaolo Bonzini } else { 141e9527dd3SPaolo Bonzini do_trace_enable_events(line_buf); 142e9527dd3SPaolo Bonzini } 143e9527dd3SPaolo Bonzini } 144e9527dd3SPaolo Bonzini 14545bd0b41SPaolo Bonzini void trace_init_events(const char *fname) 14623d15e86SLluís { 147a35d9be6SAlexey Kardashevskiy Location loc; 148a35d9be6SAlexey Kardashevskiy FILE *fp; 149a35d9be6SAlexey Kardashevskiy char line_buf[1024]; 150a35d9be6SAlexey Kardashevskiy size_t line_idx = 0; 151a35d9be6SAlexey Kardashevskiy 15223d15e86SLluís if (fname == NULL) { 15323d15e86SLluís return; 15423d15e86SLluís } 15523d15e86SLluís 156a35d9be6SAlexey Kardashevskiy loc_push_none(&loc); 157a35d9be6SAlexey Kardashevskiy loc_set_file(fname, 0); 158a35d9be6SAlexey Kardashevskiy fp = fopen(fname, "r"); 15923d15e86SLluís if (!fp) { 160a35d9be6SAlexey Kardashevskiy error_report("%s", strerror(errno)); 16123d15e86SLluís exit(1); 16223d15e86SLluís } 16323d15e86SLluís while (fgets(line_buf, sizeof(line_buf), fp)) { 164a35d9be6SAlexey Kardashevskiy loc_set_file(fname, ++line_idx); 16523d15e86SLluís size_t len = strlen(line_buf); 16623d15e86SLluís if (len > 1) { /* skip empty lines */ 16723d15e86SLluís line_buf[len - 1] = '\0'; 168794b1f96SAlexey Kardashevskiy if ('#' == line_buf[0]) { /* skip commented lines */ 169794b1f96SAlexey Kardashevskiy continue; 170794b1f96SAlexey Kardashevskiy } 17110578a25SPaolo Bonzini trace_enable_events(line_buf); 17223d15e86SLluís } 17382432638SAlexey Kardashevskiy } 17423d15e86SLluís if (fclose(fp) != 0) { 175a35d9be6SAlexey Kardashevskiy loc_set_file(fname, 0); 176a35d9be6SAlexey Kardashevskiy error_report("%s", strerror(errno)); 17723d15e86SLluís exit(1); 17823d15e86SLluís } 179a35d9be6SAlexey Kardashevskiy loc_pop(&loc); 18023d15e86SLluís } 1815b808275SLluís Vilanova 18241fc57e4SPaolo Bonzini void trace_init_file(const char *file) 1835b808275SLluís Vilanova { 1845b808275SLluís Vilanova #ifdef CONFIG_TRACE_SIMPLE 18541fc57e4SPaolo Bonzini st_set_trace_file(file); 186ed7f5f1dSPaolo Bonzini #elif defined CONFIG_TRACE_LOG 187ed7f5f1dSPaolo Bonzini /* If both the simple and the log backends are enabled, "-trace file" 188ed7f5f1dSPaolo Bonzini * only applies to the simple backend; use "-D" for the log backend. 189ed7f5f1dSPaolo Bonzini */ 190ed7f5f1dSPaolo Bonzini if (file) { 191*daa76aa4SMarkus Armbruster qemu_set_log_filename(file, &error_fatal); 192ed7f5f1dSPaolo Bonzini } 1935b808275SLluís Vilanova #else 1945b808275SLluís Vilanova if (file) { 1955b808275SLluís Vilanova fprintf(stderr, "error: -trace file=...: " 1965b808275SLluís Vilanova "option not supported by the selected tracing backends\n"); 19741fc57e4SPaolo Bonzini exit(1); 19841fc57e4SPaolo Bonzini } 19941fc57e4SPaolo Bonzini #endif 20041fc57e4SPaolo Bonzini } 20141fc57e4SPaolo Bonzini 20241fc57e4SPaolo Bonzini bool trace_init_backends(void) 20341fc57e4SPaolo Bonzini { 20441fc57e4SPaolo Bonzini #ifdef CONFIG_TRACE_SIMPLE 20541fc57e4SPaolo Bonzini if (!st_init()) { 20641fc57e4SPaolo Bonzini fprintf(stderr, "failed to initialize simple tracing backend.\n"); 2075b808275SLluís Vilanova return false; 2085b808275SLluís Vilanova } 2095b808275SLluís Vilanova #endif 2105b808275SLluís Vilanova 2115b808275SLluís Vilanova #ifdef CONFIG_TRACE_FTRACE 2125b808275SLluís Vilanova if (!ftrace_init()) { 2135b808275SLluís Vilanova fprintf(stderr, "failed to initialize ftrace backend.\n"); 2145b808275SLluís Vilanova return false; 2155b808275SLluís Vilanova } 2165b808275SLluís Vilanova #endif 2175b808275SLluís Vilanova 2185b808275SLluís Vilanova return true; 2195b808275SLluís Vilanova } 220