*
*/
-#include <stdlib.h>
-#include <stdint.h>
-#include <stdio.h>
-#include <time.h>
+#include "qemu/osdep.h"
#ifndef _WIN32
-#include <signal.h>
#include <pthread.h>
#endif
#include "qemu/timer.h"
-#include "trace.h"
#include "trace/control.h"
+#include "trace/simple.h"
+#include "qemu/error-report.h"
-/** Trace file header event ID */
-#define HEADER_EVENT_ID (~(uint64_t)0) /* avoids conflicting with TraceEventIDs */
+/** Trace file header event ID, picked to avoid conflict with real event IDs */
+#define HEADER_EVENT_ID (~(uint64_t)0)
/** Trace file magic number */
#define HEADER_MAGIC 0xf2b177cb0aa429b4ULL
/** Trace file version number, bump if format changes */
-#define HEADER_VERSION 2
+#define HEADER_VERSION 4
/** Records were dropped event ID */
#define DROPPED_EVENT_ID (~(uint64_t)0 - 1)
* Trace records are written out by a dedicated thread. The thread waits for
* records to become available, writes them out, and then waits again.
*/
-static GStaticMutex trace_lock = G_STATIC_MUTEX_INIT;
-static GCond *trace_available_cond;
-static GCond *trace_empty_cond;
+static GMutex trace_lock;
+static GCond trace_available_cond;
+static GCond trace_empty_cond;
+
static bool trace_available;
static bool trace_writeout_enabled;
};
uint8_t trace_buf[TRACE_BUF_LEN];
-static unsigned int trace_idx;
+static volatile gint trace_idx;
static unsigned int writeout_idx;
-static int dropped_events;
+static volatile gint dropped_events;
+static uint32_t trace_pid;
static FILE *trace_fp;
static char *trace_file_name;
+#define TRACE_RECORD_TYPE_MAPPING 0
+#define TRACE_RECORD_TYPE_EVENT 1
+
/* * Trace buffer entry */
typedef struct {
- uint64_t event; /* TraceEventID */
+ uint64_t event; /* event ID value */
uint64_t timestamp_ns;
uint32_t length; /* in bytes */
- uint32_t reserved; /* unused */
+ uint32_t pid;
uint64_t arguments[];
} TraceRecord;
smp_rmb(); /* read memory barrier before accessing record */
/* read the record header to know record length */
read_from_buffer(idx, &record, sizeof(TraceRecord));
- *recordptr = malloc(record.length); /* dont use g_malloc, can deadlock when traced */
+ *recordptr = malloc(record.length); /* don't use g_malloc, can deadlock when traced */
/* make a copy of record to avoid being overwritten */
read_from_buffer(idx, *recordptr, record.length);
smp_rmb(); /* memory barrier before clearing valid flag */
*/
static void flush_trace_file(bool wait)
{
- g_static_mutex_lock(&trace_lock);
+ g_mutex_lock(&trace_lock);
trace_available = true;
- g_cond_signal(trace_available_cond);
+ g_cond_signal(&trace_available_cond);
if (wait) {
- g_cond_wait(trace_empty_cond, g_static_mutex_get_mutex(&trace_lock));
+ g_cond_wait(&trace_empty_cond, &trace_lock);
}
- g_static_mutex_unlock(&trace_lock);
+ g_mutex_unlock(&trace_lock);
}
static void wait_for_trace_records_available(void)
{
- g_static_mutex_lock(&trace_lock);
+ g_mutex_lock(&trace_lock);
while (!(trace_available && trace_writeout_enabled)) {
- g_cond_signal(trace_empty_cond);
- g_cond_wait(trace_available_cond,
- g_static_mutex_get_mutex(&trace_lock));
+ g_cond_signal(&trace_empty_cond);
+ g_cond_wait(&trace_available_cond, &trace_lock);
}
trace_available = false;
- g_static_mutex_unlock(&trace_lock);
+ g_mutex_unlock(&trace_lock);
}
static gpointer writeout_thread(gpointer opaque)
unsigned int idx = 0;
int dropped_count;
size_t unused __attribute__ ((unused));
+ uint64_t type = TRACE_RECORD_TYPE_EVENT;
for (;;) {
wait_for_trace_records_available();
if (g_atomic_int_get(&dropped_events)) {
- dropped.rec.event = DROPPED_EVENT_ID,
+ dropped.rec.event = DROPPED_EVENT_ID;
dropped.rec.timestamp_ns = get_clock();
- dropped.rec.length = sizeof(TraceRecord) + sizeof(uint64_t),
- dropped.rec.reserved = 0;
+ dropped.rec.length = sizeof(TraceRecord) + sizeof(uint64_t);
+ dropped.rec.pid = trace_pid;
do {
dropped_count = g_atomic_int_get(&dropped_events);
} while (!g_atomic_int_compare_and_exchange(&dropped_events,
dropped_count, 0));
dropped.rec.arguments[0] = dropped_count;
+ unused = fwrite(&type, sizeof(type), 1, trace_fp);
unused = fwrite(&dropped.rec, dropped.rec.length, 1, trace_fp);
}
while (get_trace_record(idx, &recordptr)) {
+ unused = fwrite(&type, sizeof(type), 1, trace_fp);
unused = fwrite(recordptr, recordptr->length, 1, trace_fp);
writeout_idx += recordptr->length;
- free(recordptr); /* dont use g_free, can deadlock when traced */
+ free(recordptr); /* don't use g_free, can deadlock when traced */
idx = writeout_idx % TRACE_BUF_LEN;
}
rec->rec_off = write_to_buffer(rec->rec_off, (void*)s, slen);
}
-int trace_record_start(TraceBufferRecord *rec, TraceEventID event, size_t datasize)
+int trace_record_start(TraceBufferRecord *rec, uint32_t event, size_t datasize)
{
unsigned int idx, rec_off, old_idx, new_idx;
uint32_t rec_len = sizeof(TraceRecord) + datasize;
+ uint64_t event_u64 = event;
uint64_t timestamp_ns = get_clock();
do {
idx = old_idx % TRACE_BUF_LEN;
rec_off = idx;
- rec_off = write_to_buffer(rec_off, &event, sizeof(event));
+ rec_off = write_to_buffer(rec_off, &event_u64, sizeof(event_u64));
rec_off = write_to_buffer(rec_off, ×tamp_ns, sizeof(timestamp_ns));
rec_off = write_to_buffer(rec_off, &rec_len, sizeof(rec_len));
+ rec_off = write_to_buffer(rec_off, &trace_pid, sizeof(trace_pid));
rec->tbuf_idx = idx;
rec->rec_off = (idx + sizeof(TraceRecord)) % TRACE_BUF_LEN;
record.event |= TRACE_RECORD_VALID;
write_to_buffer(rec->tbuf_idx, &record, sizeof(TraceRecord));
- if ((g_atomic_int_get(&trace_idx) - writeout_idx)
+ if (((unsigned int)g_atomic_int_get(&trace_idx) - writeout_idx)
> TRACE_BUF_FLUSH_THRESHOLD) {
flush_trace_file(false);
}
}
+static int st_write_event_mapping(void)
+{
+ uint64_t type = TRACE_RECORD_TYPE_MAPPING;
+ TraceEventIter iter;
+ TraceEvent *ev;
+
+ trace_event_iter_init(&iter, NULL);
+ while ((ev = trace_event_iter_next(&iter)) != NULL) {
+ uint64_t id = trace_event_get_id(ev);
+ const char *name = trace_event_get_name(ev);
+ uint32_t len = strlen(name);
+ if (fwrite(&type, sizeof(type), 1, trace_fp) != 1 ||
+ fwrite(&id, sizeof(id), 1, trace_fp) != 1 ||
+ fwrite(&len, sizeof(len), 1, trace_fp) != 1 ||
+ fwrite(name, len, 1, trace_fp) != 1) {
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
void st_set_trace_file_enabled(bool enable)
{
if (enable == !!trace_fp) {
return;
}
- if (fwrite(&header, sizeof header, 1, trace_fp) != 1) {
+ if (fwrite(&header, sizeof header, 1, trace_fp) != 1 ||
+ st_write_event_mapping() < 0) {
fclose(trace_fp);
trace_fp = NULL;
return;
* @file The trace file name or NULL for the default name-<pid> set at
* config time
*/
-bool st_set_trace_file(const char *file)
+void st_set_trace_file(const char *file)
{
st_set_trace_file_enabled(false);
g_free(trace_file_name);
if (!file) {
- trace_file_name = g_strdup_printf(CONFIG_TRACE_FILE, getpid());
+ /* Type cast needed for Windows where getpid() returns an int. */
+ trace_file_name = g_strdup_printf(CONFIG_TRACE_FILE, (pid_t)getpid());
} else {
trace_file_name = g_strdup_printf("%s", file);
}
st_set_trace_file_enabled(true);
- return true;
}
void st_print_trace_file_status(FILE *stream, int (*stream_printf)(FILE *stream, const char *fmt, ...))
flush_trace_file(true);
}
-void trace_print_events(FILE *stream, fprintf_function stream_printf)
-{
- unsigned int i;
-
- for (i = 0; i < NR_TRACE_EVENTS; i++) {
- stream_printf(stream, "%s [Event ID %u] : state %u\n",
- trace_list[i].tp_name, i, trace_list[i].state);
- }
-}
-
-bool trace_event_set_state(const char *name, bool state)
-{
- unsigned int i;
- unsigned int len;
- bool wildcard = false;
- bool matched = false;
-
- len = strlen(name);
- if (len > 0 && name[len - 1] == '*') {
- wildcard = true;
- len -= 1;
- }
- for (i = 0; i < NR_TRACE_EVENTS; i++) {
- if (wildcard) {
- if (!strncmp(trace_list[i].tp_name, name, len)) {
- trace_list[i].state = state;
- matched = true;
- }
- continue;
- }
- if (!strcmp(trace_list[i].tp_name, name)) {
- trace_list[i].state = state;
- return true;
- }
- }
- return matched;
-}
-
/* Helper function to create a thread with signals blocked. Use glib's
* portable threads since QEMU abstractions cannot be used due to reentrancy in
* the tracer. Also note the signal masking on POSIX hosts so that the thread
sigfillset(&set);
pthread_sigmask(SIG_SETMASK, &set, &oldset);
#endif
- thread = g_thread_create(fn, NULL, FALSE, NULL);
+
+ thread = g_thread_new("trace-thread", fn, NULL);
+
#ifndef _WIN32
pthread_sigmask(SIG_SETMASK, &oldset, NULL);
#endif
return thread;
}
-bool trace_backend_init(const char *events, const char *file)
+bool st_init(void)
{
GThread *thread;
- if (!g_thread_supported()) {
-#if !GLIB_CHECK_VERSION(2, 31, 0)
- g_thread_init(NULL);
-#else
- fprintf(stderr, "glib threading failed to initialize.\n");
- exit(1);
-#endif
- }
-
- trace_available_cond = g_cond_new();
- trace_empty_cond = g_cond_new();
+ trace_pid = getpid();
thread = trace_thread_create(writeout_thread);
if (!thread) {
- fprintf(stderr, "warning: unable to initialize simple trace backend\n");
+ warn_report("unable to initialize simple trace backend");
return false;
}
atexit(st_flush_trace_buffer);
- trace_backend_init_events(events);
- st_set_trace_file(file);
return true;
}
projects / qemu.git / blobdiff