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* Copyright IBM, Corp. 2010
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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#include "qemu-timer.h"
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/** Trace file header event ID */
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#define HEADER_EVENT_ID (~(uint64_t)0) /* avoids conflicting with TraceEventIDs */
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/** Trace file magic number */
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#define HEADER_MAGIC 0xf2b177cb0aa429b4ULL
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/** Trace file version number, bump if format changes */
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#define HEADER_VERSION 0
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/** Records were dropped event ID */
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#define DROPPED_EVENT_ID (~(uint64_t)0 - 1)
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/** Trace record is valid */
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#define TRACE_RECORD_VALID ((uint64_t)1 << 63)
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/** Trace buffer entry */
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uint64_t timestamp_ns;
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TRACE_BUF_FLUSH_THRESHOLD = TRACE_BUF_LEN / 4,
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* Trace records are written out by a dedicated thread. The thread waits for
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* records to become available, writes them out, and then waits again.
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static pthread_mutex_t trace_lock = PTHREAD_MUTEX_INITIALIZER;
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static pthread_cond_t trace_available_cond = PTHREAD_COND_INITIALIZER;
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static pthread_cond_t trace_empty_cond = PTHREAD_COND_INITIALIZER;
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static bool trace_available;
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static bool trace_writeout_enabled;
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static TraceRecord trace_buf[TRACE_BUF_LEN];
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static unsigned int trace_idx;
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static FILE *trace_fp;
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static char *trace_file_name = NULL;
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* Read a trace record from the trace buffer
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* @idx Trace buffer index
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* @record Trace record to fill
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* Returns false if the record is not valid.
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static bool get_trace_record(unsigned int idx, TraceRecord *record)
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if (!(trace_buf[idx].event & TRACE_RECORD_VALID)) {
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__sync_synchronize(); /* read memory barrier before accessing record */
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*record = trace_buf[idx];
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record->event &= ~TRACE_RECORD_VALID;
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* Kick writeout thread
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* @wait Whether to wait for writeout thread to complete
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static void flush_trace_file(bool wait)
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pthread_mutex_lock(&trace_lock);
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trace_available = true;
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pthread_cond_signal(&trace_available_cond);
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pthread_cond_wait(&trace_empty_cond, &trace_lock);
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pthread_mutex_unlock(&trace_lock);
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static void wait_for_trace_records_available(void)
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pthread_mutex_lock(&trace_lock);
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while (!(trace_available && trace_writeout_enabled)) {
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pthread_cond_signal(&trace_empty_cond);
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pthread_cond_wait(&trace_available_cond, &trace_lock);
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trace_available = false;
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pthread_mutex_unlock(&trace_lock);
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static void *writeout_thread(void *opaque)
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unsigned int writeout_idx = 0;
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unsigned int num_available, idx;
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size_t unused __attribute__ ((unused));
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wait_for_trace_records_available();
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num_available = trace_idx - writeout_idx;
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if (num_available > TRACE_BUF_LEN) {
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record = (TraceRecord){
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.event = DROPPED_EVENT_ID,
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unused = fwrite(&record, sizeof(record), 1, trace_fp);
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writeout_idx += num_available;
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idx = writeout_idx % TRACE_BUF_LEN;
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while (get_trace_record(idx, &record)) {
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trace_buf[idx].event = 0; /* clear valid bit */
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unused = fwrite(&record, sizeof(record), 1, trace_fp);
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idx = ++writeout_idx % TRACE_BUF_LEN;
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static void trace(TraceEventID event, uint64_t x1, uint64_t x2, uint64_t x3,
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uint64_t x4, uint64_t x5, uint64_t x6)
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if (!trace_list[event].state) {
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timestamp = get_clock();
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idx = __sync_fetch_and_add(&trace_idx, 1) % TRACE_BUF_LEN;
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trace_buf[idx] = (TraceRecord){
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.timestamp_ns = timestamp,
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__sync_synchronize(); /* write barrier before marking as valid */
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trace_buf[idx].event |= TRACE_RECORD_VALID;
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if ((idx + 1) % TRACE_BUF_FLUSH_THRESHOLD == 0) {
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flush_trace_file(false);
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void trace0(TraceEventID event)
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trace(event, 0, 0, 0, 0, 0, 0);
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void trace1(TraceEventID event, uint64_t x1)
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trace(event, x1, 0, 0, 0, 0, 0);
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void trace2(TraceEventID event, uint64_t x1, uint64_t x2)
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trace(event, x1, x2, 0, 0, 0, 0);
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void trace3(TraceEventID event, uint64_t x1, uint64_t x2, uint64_t x3)
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trace(event, x1, x2, x3, 0, 0, 0);
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void trace4(TraceEventID event, uint64_t x1, uint64_t x2, uint64_t x3, uint64_t x4)
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trace(event, x1, x2, x3, x4, 0, 0);
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void trace5(TraceEventID event, uint64_t x1, uint64_t x2, uint64_t x3, uint64_t x4, uint64_t x5)
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trace(event, x1, x2, x3, x4, x5, 0);
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void trace6(TraceEventID event, uint64_t x1, uint64_t x2, uint64_t x3, uint64_t x4, uint64_t x5, uint64_t x6)
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trace(event, x1, x2, x3, x4, x5, x6);
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void st_set_trace_file_enabled(bool enable)
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if (enable == !!trace_fp) {
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return; /* no change */
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/* Halt trace writeout */
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flush_trace_file(true);
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trace_writeout_enabled = false;
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flush_trace_file(true);
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static const TraceRecord header = {
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.event = HEADER_EVENT_ID,
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.timestamp_ns = HEADER_MAGIC,
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.x1 = HEADER_VERSION,
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trace_fp = fopen(trace_file_name, "w");
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if (fwrite(&header, sizeof header, 1, trace_fp) != 1) {
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/* Resume trace writeout */
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trace_writeout_enabled = true;
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flush_trace_file(false);
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* Set the name of a trace file
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* @file The trace file name or NULL for the default name-<pid> set at
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bool st_set_trace_file(const char *file)
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st_set_trace_file_enabled(false);
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free(trace_file_name);
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if (asprintf(&trace_file_name, CONFIG_TRACE_FILE, getpid()) < 0) {
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trace_file_name = NULL;
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if (asprintf(&trace_file_name, "%s", file) < 0) {
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trace_file_name = NULL;
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st_set_trace_file_enabled(true);
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void st_print_trace_file_status(FILE *stream, int (*stream_printf)(FILE *stream, const char *fmt, ...))
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stream_printf(stream, "Trace file \"%s\" %s.\n",
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trace_file_name, trace_fp ? "on" : "off");
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void st_print_trace(FILE *stream, int (*stream_printf)(FILE *stream, const char *fmt, ...))
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for (i = 0; i < TRACE_BUF_LEN; i++) {
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if (!get_trace_record(i, &record)) {
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stream_printf(stream, "Event %" PRIu64 " : %" PRIx64 " %" PRIx64
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" %" PRIx64 " %" PRIx64 " %" PRIx64 " %" PRIx64 "\n",
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record.event, record.x1, record.x2,
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record.x3, record.x4, record.x5,
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void st_print_trace_events(FILE *stream, int (*stream_printf)(FILE *stream, const char *fmt, ...))
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for (i = 0; i < NR_TRACE_EVENTS; i++) {
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stream_printf(stream, "%s [Event ID %u] : state %u\n",
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trace_list[i].tp_name, i, trace_list[i].state);
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bool st_change_trace_event_state(const char *name, bool enabled)
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for (i = 0; i < NR_TRACE_EVENTS; i++) {
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if (!strcmp(trace_list[i].tp_name, name)) {
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trace_list[i].state = enabled;
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void st_flush_trace_buffer(void)
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flush_trace_file(true);
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bool st_init(const char *file)
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sigset_t set, oldset;
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pthread_attr_init(&attr);
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pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
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pthread_sigmask(SIG_SETMASK, &set, &oldset);
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ret = pthread_create(&thread, &attr, writeout_thread, NULL);
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pthread_sigmask(SIG_SETMASK, &oldset, NULL);
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atexit(st_flush_trace_buffer);
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st_set_trace_file(file);