313 lines
7.8 KiB
C
313 lines
7.8 KiB
C
/*
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* Interface for configuring and controlling the state of tracing events.
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*
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* Copyright (C) 2011-2016 Lluís Vilanova <vilanova@ac.upc.edu>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "trace/control.h"
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#include "qemu/help_option.h"
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#include "qemu/option.h"
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#ifdef CONFIG_TRACE_SIMPLE
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#include "trace/simple.h"
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#endif
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#ifdef CONFIG_TRACE_FTRACE
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#include "trace/ftrace.h"
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#endif
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#ifdef CONFIG_TRACE_LOG
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#include "qemu/log.h"
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#endif
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#ifdef CONFIG_TRACE_SYSLOG
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#include <syslog.h>
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#endif
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#include "qapi/error.h"
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#include "qemu/error-report.h"
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#include "qemu/config-file.h"
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#include "monitor/monitor.h"
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#include "trace/trace-root.h"
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int trace_events_enabled_count;
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typedef struct TraceEventGroup {
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TraceEvent **events;
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} TraceEventGroup;
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static TraceEventGroup *event_groups;
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static size_t nevent_groups;
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static uint32_t next_id;
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static uint32_t next_vcpu_id;
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static bool init_trace_on_startup;
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QemuOptsList qemu_trace_opts = {
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.name = "trace",
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.implied_opt_name = "enable",
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.head = QTAILQ_HEAD_INITIALIZER(qemu_trace_opts.head),
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.desc = {
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{
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.name = "enable",
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.type = QEMU_OPT_STRING,
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},
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{
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.name = "events",
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.type = QEMU_OPT_STRING,
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},{
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.name = "file",
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.type = QEMU_OPT_STRING,
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},
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{ /* end of list */ }
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},
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};
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void trace_event_register_group(TraceEvent **events)
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{
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size_t i;
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for (i = 0; events[i] != NULL; i++) {
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events[i]->id = next_id++;
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if (events[i]->vcpu_id == TRACE_VCPU_EVENT_NONE) {
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continue;
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}
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if (likely(next_vcpu_id < CPU_TRACE_DSTATE_MAX_EVENTS)) {
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events[i]->vcpu_id = next_vcpu_id++;
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} else {
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warn_report("too many vcpu trace events; dropping '%s'",
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events[i]->name);
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}
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}
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event_groups = g_renew(TraceEventGroup, event_groups, nevent_groups + 1);
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event_groups[nevent_groups].events = events;
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nevent_groups++;
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}
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TraceEvent *trace_event_name(const char *name)
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{
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assert(name != NULL);
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TraceEventIter iter;
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TraceEvent *ev;
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trace_event_iter_init(&iter, NULL);
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while ((ev = trace_event_iter_next(&iter)) != NULL) {
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if (strcmp(trace_event_get_name(ev), name) == 0) {
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return ev;
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}
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}
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return NULL;
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}
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void trace_event_iter_init(TraceEventIter *iter, const char *pattern)
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{
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iter->event = 0;
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iter->group = 0;
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iter->pattern = pattern;
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}
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TraceEvent *trace_event_iter_next(TraceEventIter *iter)
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{
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while (iter->group < nevent_groups &&
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event_groups[iter->group].events[iter->event] != NULL) {
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TraceEvent *ev = event_groups[iter->group].events[iter->event];
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iter->event++;
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if (event_groups[iter->group].events[iter->event] == NULL) {
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iter->event = 0;
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iter->group++;
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}
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if (!iter->pattern ||
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g_pattern_match_simple(iter->pattern, trace_event_get_name(ev))) {
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return ev;
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}
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}
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return NULL;
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}
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void trace_list_events(FILE *f)
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{
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TraceEventIter iter;
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TraceEvent *ev;
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trace_event_iter_init(&iter, NULL);
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while ((ev = trace_event_iter_next(&iter)) != NULL) {
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fprintf(f, "%s\n", trace_event_get_name(ev));
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}
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#ifdef CONFIG_TRACE_DTRACE
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fprintf(f, "This list of names of trace points may be incomplete "
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"when using the DTrace/SystemTap backends.\n"
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"Run 'qemu-trace-stap list %s' to print the full list.\n",
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error_get_progname());
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#endif
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}
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static void do_trace_enable_events(const char *line_buf)
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{
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const bool enable = ('-' != line_buf[0]);
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const char *line_ptr = enable ? line_buf : line_buf + 1;
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TraceEventIter iter;
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TraceEvent *ev;
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bool is_pattern = trace_event_is_pattern(line_ptr);
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trace_event_iter_init(&iter, line_ptr);
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while ((ev = trace_event_iter_next(&iter)) != NULL) {
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if (!trace_event_get_state_static(ev)) {
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if (!is_pattern) {
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warn_report("trace event '%s' is not traceable",
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line_ptr);
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return;
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}
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continue;
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}
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/* start tracing */
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trace_event_set_state_dynamic(ev, enable);
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if (!is_pattern) {
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return;
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}
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}
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if (!is_pattern) {
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warn_report("trace event '%s' does not exist",
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line_ptr);
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}
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}
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void trace_enable_events(const char *line_buf)
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{
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if (is_help_option(line_buf)) {
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trace_list_events(stdout);
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if (monitor_cur() == NULL) {
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exit(0);
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}
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} else {
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do_trace_enable_events(line_buf);
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}
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}
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static void trace_init_events(const char *fname)
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{
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Location loc;
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FILE *fp;
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char line_buf[1024];
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size_t line_idx = 0;
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if (fname == NULL) {
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return;
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}
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loc_push_none(&loc);
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loc_set_file(fname, 0);
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fp = fopen(fname, "r");
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if (!fp) {
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error_report("%s", strerror(errno));
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exit(1);
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}
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while (fgets(line_buf, sizeof(line_buf), fp)) {
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loc_set_file(fname, ++line_idx);
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size_t len = strlen(line_buf);
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if (len > 1) { /* skip empty lines */
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line_buf[len - 1] = '\0';
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if ('#' == line_buf[0]) { /* skip commented lines */
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continue;
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}
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trace_enable_events(line_buf);
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}
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}
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if (fclose(fp) != 0) {
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loc_set_file(fname, 0);
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error_report("%s", strerror(errno));
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exit(1);
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}
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loc_pop(&loc);
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}
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void trace_init_file(void)
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{
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QemuOpts *opts = qemu_find_opts_singleton("trace");
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const char *file = qemu_opt_get(opts, "file");
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#ifdef CONFIG_TRACE_SIMPLE
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st_set_trace_file(file);
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if (init_trace_on_startup) {
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st_set_trace_file_enabled(true);
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}
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#elif defined CONFIG_TRACE_LOG
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/*
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* If both the simple and the log backends are enabled, "--trace file"
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* only applies to the simple backend; use "-D" for the log
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* backend. However we should only override -D if we actually have
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* something to override it with.
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*/
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if (file) {
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qemu_set_log_filename(file, &error_fatal);
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}
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#else
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if (file) {
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fprintf(stderr, "error: --trace file=...: "
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"option not supported by the selected tracing backends\n");
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exit(1);
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}
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#endif
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}
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void trace_fini_vcpu(CPUState *vcpu)
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{
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TraceEventIter iter;
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TraceEvent *ev;
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trace_guest_cpu_exit(vcpu);
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trace_event_iter_init(&iter, NULL);
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while ((ev = trace_event_iter_next(&iter)) != NULL) {
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if (trace_event_is_vcpu(ev) &&
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trace_event_get_state_static(ev) &&
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trace_event_get_vcpu_state_dynamic(vcpu, ev)) {
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/* must disable to affect the global counter */
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trace_event_set_vcpu_state_dynamic(vcpu, ev, false);
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}
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}
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}
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bool trace_init_backends(void)
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{
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#ifdef CONFIG_TRACE_SIMPLE
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if (!st_init()) {
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fprintf(stderr, "failed to initialize simple tracing backend.\n");
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return false;
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}
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#endif
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#ifdef CONFIG_TRACE_FTRACE
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if (!ftrace_init()) {
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fprintf(stderr, "failed to initialize ftrace backend.\n");
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return false;
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}
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#endif
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#ifdef CONFIG_TRACE_SYSLOG
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openlog(NULL, LOG_PID, LOG_DAEMON);
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#endif
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return true;
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}
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void trace_opt_parse(const char *optarg)
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{
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QemuOpts *opts = qemu_opts_parse_noisily(qemu_find_opts("trace"),
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optarg, true);
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if (!opts) {
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exit(1);
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}
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if (qemu_opt_get(opts, "enable")) {
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trace_enable_events(qemu_opt_get(opts, "enable"));
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}
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trace_init_events(qemu_opt_get(opts, "events"));
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init_trace_on_startup = true;
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qemu_opts_del(opts);
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}
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uint32_t trace_get_vcpu_event_count(void)
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{
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return next_vcpu_id;
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}
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