mirror of
https://gitlab.com/qemu-project/qemu
synced 2024-09-06 18:05:37 +00:00
![Alex Bennée](/assets/img/avatar_default.png)
Now we no longer have any events that are for vcpus we can start excising the code from the trace control. As the vcpu parameter is encoded as part of QMP we just stub out the has_vcpu/vcpu parameters rather than alter the API. Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Message-id: 20230526165401.574474-8-alex.bennee@linaro.org Message-Id: <20230524133952.3971948-7-alex.bennee@linaro.org> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
309 lines
7.6 KiB
C
309 lines
7.6 KiB
C
/*
|
|
* Interface for configuring and controlling the state of tracing events.
|
|
*
|
|
* Copyright (C) 2011-2016 Lluís Vilanova <vilanova@ac.upc.edu>
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2 or later.
|
|
* See the COPYING file in the top-level directory.
|
|
*/
|
|
|
|
#include "qemu/osdep.h"
|
|
#include "trace/control.h"
|
|
#include "qemu/help_option.h"
|
|
#include "qemu/option.h"
|
|
#ifdef CONFIG_TRACE_SIMPLE
|
|
#include "trace/simple.h"
|
|
#endif
|
|
#ifdef CONFIG_TRACE_FTRACE
|
|
#include "trace/ftrace.h"
|
|
#endif
|
|
#ifdef CONFIG_TRACE_LOG
|
|
#include "qemu/log.h"
|
|
#endif
|
|
#ifdef CONFIG_TRACE_SYSLOG
|
|
#include <syslog.h>
|
|
#endif
|
|
#include "qapi/error.h"
|
|
#include "qemu/error-report.h"
|
|
#include "qemu/config-file.h"
|
|
#include "monitor/monitor.h"
|
|
#include "trace/trace-root.h"
|
|
|
|
int trace_events_enabled_count;
|
|
|
|
typedef struct TraceEventGroup {
|
|
TraceEvent **events;
|
|
} TraceEventGroup;
|
|
|
|
static TraceEventGroup *event_groups;
|
|
static size_t nevent_groups;
|
|
static uint32_t next_id;
|
|
static uint32_t next_vcpu_id;
|
|
static bool init_trace_on_startup;
|
|
static char *trace_opts_file;
|
|
|
|
QemuOptsList qemu_trace_opts = {
|
|
.name = "trace",
|
|
.implied_opt_name = "enable",
|
|
.head = QTAILQ_HEAD_INITIALIZER(qemu_trace_opts.head),
|
|
.desc = {
|
|
{
|
|
.name = "enable",
|
|
.type = QEMU_OPT_STRING,
|
|
},
|
|
{
|
|
.name = "events",
|
|
.type = QEMU_OPT_STRING,
|
|
},{
|
|
.name = "file",
|
|
.type = QEMU_OPT_STRING,
|
|
},
|
|
{ /* end of list */ }
|
|
},
|
|
};
|
|
|
|
|
|
void trace_event_register_group(TraceEvent **events)
|
|
{
|
|
size_t i;
|
|
for (i = 0; events[i] != NULL; i++) {
|
|
events[i]->id = next_id++;
|
|
}
|
|
event_groups = g_renew(TraceEventGroup, event_groups, nevent_groups + 1);
|
|
event_groups[nevent_groups].events = events;
|
|
nevent_groups++;
|
|
|
|
#ifdef CONFIG_TRACE_SIMPLE
|
|
st_init_group(nevent_groups - 1);
|
|
#endif
|
|
}
|
|
|
|
|
|
TraceEvent *trace_event_name(const char *name)
|
|
{
|
|
assert(name != NULL);
|
|
|
|
TraceEventIter iter;
|
|
TraceEvent *ev;
|
|
trace_event_iter_init_all(&iter);
|
|
while ((ev = trace_event_iter_next(&iter)) != NULL) {
|
|
if (strcmp(trace_event_get_name(ev), name) == 0) {
|
|
return ev;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
void trace_event_iter_init_all(TraceEventIter *iter)
|
|
{
|
|
iter->event = 0;
|
|
iter->group = 0;
|
|
iter->group_id = -1;
|
|
iter->pattern = NULL;
|
|
}
|
|
|
|
void trace_event_iter_init_pattern(TraceEventIter *iter, const char *pattern)
|
|
{
|
|
trace_event_iter_init_all(iter);
|
|
iter->pattern = pattern;
|
|
}
|
|
|
|
void trace_event_iter_init_group(TraceEventIter *iter, size_t group_id)
|
|
{
|
|
trace_event_iter_init_all(iter);
|
|
iter->group_id = group_id;
|
|
}
|
|
|
|
TraceEvent *trace_event_iter_next(TraceEventIter *iter)
|
|
{
|
|
while (iter->group < nevent_groups &&
|
|
event_groups[iter->group].events[iter->event] != NULL) {
|
|
TraceEvent *ev = event_groups[iter->group].events[iter->event];
|
|
size_t group = iter->group;
|
|
iter->event++;
|
|
if (event_groups[iter->group].events[iter->event] == NULL) {
|
|
iter->event = 0;
|
|
iter->group++;
|
|
}
|
|
if (iter->pattern &&
|
|
!g_pattern_match_simple(iter->pattern, trace_event_get_name(ev))) {
|
|
continue;
|
|
}
|
|
if (iter->group_id != -1 &&
|
|
iter->group_id != group) {
|
|
continue;
|
|
}
|
|
return ev;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
void trace_list_events(FILE *f)
|
|
{
|
|
TraceEventIter iter;
|
|
TraceEvent *ev;
|
|
trace_event_iter_init_all(&iter);
|
|
while ((ev = trace_event_iter_next(&iter)) != NULL) {
|
|
fprintf(f, "%s\n", trace_event_get_name(ev));
|
|
}
|
|
#ifdef CONFIG_TRACE_DTRACE
|
|
fprintf(f, "This list of names of trace points may be incomplete "
|
|
"when using the DTrace/SystemTap backends.\n"
|
|
"Run 'qemu-trace-stap list %s' to print the full list.\n",
|
|
g_get_prgname());
|
|
#endif
|
|
}
|
|
|
|
static void do_trace_enable_events(const char *line_buf)
|
|
{
|
|
const bool enable = ('-' != line_buf[0]);
|
|
const char *line_ptr = enable ? line_buf : line_buf + 1;
|
|
TraceEventIter iter;
|
|
TraceEvent *ev;
|
|
bool is_pattern = trace_event_is_pattern(line_ptr);
|
|
|
|
trace_event_iter_init_pattern(&iter, line_ptr);
|
|
while ((ev = trace_event_iter_next(&iter)) != NULL) {
|
|
if (!trace_event_get_state_static(ev)) {
|
|
if (!is_pattern) {
|
|
warn_report("trace event '%s' is not traceable",
|
|
line_ptr);
|
|
return;
|
|
}
|
|
continue;
|
|
}
|
|
|
|
/* start tracing */
|
|
trace_event_set_state_dynamic(ev, enable);
|
|
if (!is_pattern) {
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (!is_pattern) {
|
|
warn_report("trace event '%s' does not exist",
|
|
line_ptr);
|
|
}
|
|
}
|
|
|
|
void trace_enable_events(const char *line_buf)
|
|
{
|
|
if (is_help_option(line_buf)) {
|
|
trace_list_events(stdout);
|
|
if (monitor_cur() == NULL) {
|
|
exit(0);
|
|
}
|
|
} else {
|
|
do_trace_enable_events(line_buf);
|
|
}
|
|
}
|
|
|
|
static void trace_init_events(const char *fname)
|
|
{
|
|
Location loc;
|
|
FILE *fp;
|
|
char line_buf[1024];
|
|
size_t line_idx = 0;
|
|
|
|
if (fname == NULL) {
|
|
return;
|
|
}
|
|
|
|
loc_push_none(&loc);
|
|
loc_set_file(fname, 0);
|
|
fp = fopen(fname, "r");
|
|
if (!fp) {
|
|
error_report("%s", strerror(errno));
|
|
exit(1);
|
|
}
|
|
while (fgets(line_buf, sizeof(line_buf), fp)) {
|
|
loc_set_file(fname, ++line_idx);
|
|
size_t len = strlen(line_buf);
|
|
if (len > 1) { /* skip empty lines */
|
|
line_buf[len - 1] = '\0';
|
|
if ('#' == line_buf[0]) { /* skip commented lines */
|
|
continue;
|
|
}
|
|
trace_enable_events(line_buf);
|
|
}
|
|
}
|
|
if (fclose(fp) != 0) {
|
|
loc_set_file(fname, 0);
|
|
error_report("%s", strerror(errno));
|
|
exit(1);
|
|
}
|
|
loc_pop(&loc);
|
|
}
|
|
|
|
void trace_init_file(void)
|
|
{
|
|
#ifdef CONFIG_TRACE_SIMPLE
|
|
st_set_trace_file(trace_opts_file);
|
|
if (init_trace_on_startup) {
|
|
st_set_trace_file_enabled(true);
|
|
}
|
|
#elif defined CONFIG_TRACE_LOG
|
|
/*
|
|
* If both the simple and the log backends are enabled, "--trace file"
|
|
* only applies to the simple backend; use "-D" for the log
|
|
* backend. However we should only override -D if we actually have
|
|
* something to override it with.
|
|
*/
|
|
if (trace_opts_file) {
|
|
qemu_set_log_filename(trace_opts_file, &error_fatal);
|
|
}
|
|
#else
|
|
if (trace_opts_file) {
|
|
fprintf(stderr, "error: --trace file=...: "
|
|
"option not supported by the selected tracing backends\n");
|
|
exit(1);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
bool trace_init_backends(void)
|
|
{
|
|
#ifdef CONFIG_TRACE_SIMPLE
|
|
if (!st_init()) {
|
|
fprintf(stderr, "failed to initialize simple tracing backend.\n");
|
|
return false;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_TRACE_FTRACE
|
|
if (!ftrace_init()) {
|
|
fprintf(stderr, "failed to initialize ftrace backend.\n");
|
|
return false;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_TRACE_SYSLOG
|
|
openlog(NULL, LOG_PID, LOG_DAEMON);
|
|
#endif
|
|
|
|
return true;
|
|
}
|
|
|
|
void trace_opt_parse(const char *optarg)
|
|
{
|
|
QemuOpts *opts = qemu_opts_parse_noisily(qemu_find_opts("trace"),
|
|
optarg, true);
|
|
if (!opts) {
|
|
exit(1);
|
|
}
|
|
if (qemu_opt_get(opts, "enable")) {
|
|
trace_enable_events(qemu_opt_get(opts, "enable"));
|
|
}
|
|
trace_init_events(qemu_opt_get(opts, "events"));
|
|
init_trace_on_startup = true;
|
|
g_free(trace_opts_file);
|
|
trace_opts_file = g_strdup(qemu_opt_get(opts, "file"));
|
|
qemu_opts_del(opts);
|
|
}
|
|
|
|
uint32_t trace_get_vcpu_event_count(void)
|
|
{
|
|
return next_vcpu_id;
|
|
}
|