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/*
* builtin-inject.c
*
* Builtin inject command: Examine the live mode (stdin) event stream
* and repipe it to stdout while optionally injecting additional
* events into it.
*/
#include "builtin.h"
#include "perf.h"
#include "util/session.h"
#include "util/debug.h"
#include "util/parse-options.h"
static char const *input_name = "-";
static bool inject_build_ids;
static int event__repipe(event_t *event __used,
struct perf_session *session __used)
{
uint32_t size;
void *buf = event;
size = event->header.size;
while (size) {
int ret = write(STDOUT_FILENO, buf, size);
if (ret < 0)
return -errno;
size -= ret;
buf += ret;
}
return 0;
}
static int event__repipe_mmap(event_t *self, struct perf_session *session)
{
int err;
err = event__process_mmap(self, session);
event__repipe(self, session);
return err;
}
static int event__repipe_task(event_t *self, struct perf_session *session)
{
int err;
err = event__process_task(self, session);
event__repipe(self, session);
return err;
}
static int event__repipe_tracing_data(event_t *self,
struct perf_session *session)
{
int err;
event__repipe(self, session);
err = event__process_tracing_data(self, session);
return err;
}
static int dso__read_build_id(struct dso *self)
{
if (self->has_build_id)
return 0;
if (filename__read_build_id(self->long_name, self->build_id,
sizeof(self->build_id)) > 0) {
self->has_build_id = true;
return 0;
}
return -1;
}
static int dso__inject_build_id(struct dso *self, struct perf_session *session)
{
u16 misc = PERF_RECORD_MISC_USER;
struct machine *machine;
int err;
if (dso__read_build_id(self) < 0) {
pr_debug("no build_id found for %s\n", self->long_name);
return -1;
}
machine = perf_session__find_host_machine(session);
if (machine == NULL) {
pr_err("Can't find machine for session\n");
return -1;
}
if (self->kernel)
misc = PERF_RECORD_MISC_KERNEL;
err = event__synthesize_build_id(self, misc, event__repipe,
machine, session);
if (err) {
pr_err("Can't synthesize build_id event for %s\n", self->long_name);
return -1;
}
return 0;
}
static int event__inject_buildid(event_t *event, struct perf_session *session)
{
struct addr_location al;
struct thread *thread;
u8 cpumode;
cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
thread = perf_session__findnew(session, event->ip.pid);
if (thread == NULL) {
pr_err("problem processing %d event, skipping it.\n",
event->header.type);
goto repipe;
}
thread__find_addr_map(thread, session, cpumode, MAP__FUNCTION,
event->ip.pid, event->ip.ip, &al);
if (al.map != NULL) {
if (!al.map->dso->hit) {
al.map->dso->hit = 1;
if (map__load(al.map, NULL) >= 0) {
dso__inject_build_id(al.map->dso, session);
/*
* If this fails, too bad, let the other side
* account this as unresolved.
*/
} else
pr_warning("no symbols found in %s, maybe "
"install a debug package?\n",
al.map->dso->long_name);
}
}
repipe:
event__repipe(event, session);
return 0;
}
struct perf_event_ops inject_ops = {
.sample = event__repipe,
.mmap = event__repipe,
.comm = event__repipe,
.fork = event__repipe,
.exit = event__repipe,
.lost = event__repipe,
.read = event__repipe,
.throttle = event__repipe,
.unthrottle = event__repipe,
.attr = event__repipe,
.event_type = event__repipe,
.tracing_data = event__repipe,
.build_id = event__repipe,
};
extern volatile int session_done;
static void sig_handler(int sig __attribute__((__unused__)))
{
session_done = 1;
}
static int __cmd_inject(void)
{
struct perf_session *session;
int ret = -EINVAL;
signal(SIGINT, sig_handler);
if (inject_build_ids) {
inject_ops.sample = event__inject_buildid;
inject_ops.mmap = event__repipe_mmap;
inject_ops.fork = event__repipe_task;
inject_ops.tracing_data = event__repipe_tracing_data;
}
session = perf_session__new(input_name, O_RDONLY, false, true);
if (session == NULL)
return -ENOMEM;
ret = perf_session__process_events(session, &inject_ops);
perf_session__delete(session);
return ret;
}
static const char * const report_usage[] = {
"perf inject [<options>]",
NULL
};
static const struct option options[] = {
OPT_BOOLEAN('b', "build-ids", &inject_build_ids,
"Inject build-ids into the output stream"),
OPT_INCR('v', "verbose", &verbose,
"be more verbose (show build ids, etc)"),
OPT_END()
};
int cmd_inject(int argc, const char **argv, const char *prefix __used)
{
argc = parse_options(argc, argv, options, report_usage, 0);
/*
* Any (unrecognized) arguments left?
*/
if (argc)
usage_with_options(report_usage, options);
if (symbol__init() < 0)
return -1;
return __cmd_inject();
}
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