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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2009, 2010 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
*
*/
#include <stdlib.h>
#include <getopt.h>
#include <errno.h>
#include "tracefs.h"
#include "trace-local.h"
enum {
OPT_cpumask = 240,
OPT_graph_notrace,
OPT_graph_function,
OPT_ftrace_pid,
OPT_ftrace_notrace,
OPT_ftrace_filter,
OPT_buffer_subbuf_size_kb,
OPT_buffer_total_size_kb,
OPT_buffer_size_kb,
OPT_buffer_percent,
OPT_current_tracer,
OPT_tracing_on,
OPT_hist,
OPT_trigger,
};
void trace_show(int argc, char **argv)
{
const char *buffer = NULL;
const char *file = "trace";
const char *cpu = NULL;
struct buffer_instance *instance = &top_instance;
char *hist = NULL;
char *trigger = NULL;
char cpu_path[128];
char *path;
int snap = 0;
int pipe = 0;
int show_name = 0;
int option_index = 0;
int stop = 0;
int c;
static struct option long_options[] = {
{"hist", required_argument, NULL, OPT_hist},
{"trigger", required_argument, NULL, OPT_trigger},
{"tracing_on", no_argument, NULL, OPT_tracing_on},
{"current_tracer", no_argument, NULL, OPT_current_tracer},
{"buffer_size", no_argument, NULL, OPT_buffer_size_kb},
{"buffer_total_size", no_argument, NULL, OPT_buffer_total_size_kb},
{"buffer_subbuf_size", no_argument, NULL, OPT_buffer_subbuf_size_kb},
{"buffer_percent", no_argument, NULL, OPT_buffer_percent},
{"ftrace_filter", no_argument, NULL, OPT_ftrace_filter},
{"ftrace_notrace", no_argument, NULL, OPT_ftrace_notrace},
{"ftrace_pid", no_argument, NULL, OPT_ftrace_pid},
{"graph_function", no_argument, NULL, OPT_graph_function},
{"graph_notrace", no_argument, NULL, OPT_graph_notrace},
{"cpumask", no_argument, NULL, OPT_cpumask},
{"help", no_argument, NULL, '?'},
{NULL, 0, NULL, 0}
};
init_top_instance();
while ((c = getopt_long(argc-1, argv+1, "B:c:fsp",
long_options, &option_index)) >= 0) {
switch (c) {
case 'h':
usage(argv);
break;
case 'B':
if (buffer)
die("Can only show one buffer at a time");
buffer = optarg;
instance = allocate_instance(optarg);
if (!instance)
die("Failed to create instance");
break;
case 'c':
if (cpu)
die("Can only show one CPU at a time");
cpu = optarg;
break;
case 'f':
show_name = 1;
break;
case 's':
snap = 1;
if (pipe)
die("Can not have -s and -p together");
break;
case 'p':
pipe = 1;
if (snap)
die("Can not have -s and -p together");
break;
case OPT_hist:
hist = optarg;
break;
case OPT_trigger:
trigger = optarg;
break;
case OPT_tracing_on:
show_instance_file(instance, "tracing_on");
stop = 1;
break;
case OPT_current_tracer:
show_instance_file(instance, "current_tracer");
stop = 1;
break;
case OPT_buffer_size_kb:
show_instance_file(instance, "buffer_size_kb");
stop = 1;
break;
case OPT_buffer_total_size_kb:
show_instance_file(instance, "buffer_total_size_kb");
stop = 1;
break;
case OPT_buffer_subbuf_size_kb:
show_instance_file(instance, "buffer_subbuf_size_kb");
stop = 1;
break;
case OPT_buffer_percent:
show_instance_file(instance, "buffer_percent");
stop = 1;
break;
case OPT_ftrace_filter:
show_instance_file(instance, "set_ftrace_filter");
stop = 1;
break;
case OPT_ftrace_notrace:
show_instance_file(instance, "set_ftrace_notrace");
stop = 1;
break;
case OPT_ftrace_pid:
show_instance_file(instance, "set_ftrace_pid");
stop = 1;
break;
case OPT_graph_function:
show_instance_file(instance, "set_graph_function");
stop = 1;
break;
case OPT_graph_notrace:
show_instance_file(instance, "set_graph_notrace");
stop = 1;
break;
case OPT_cpumask:
show_instance_file(instance, "tracing_cpumask");
stop = 1;
break;
default:
usage(argv);
}
}
if (stop)
exit(0);
if (pipe)
file = "trace_pipe";
else if (snap)
file = "snapshot";
if (hist || trigger) {
char **systems = NULL;
char *system = NULL;
char *event = hist ? hist : trigger;
char *file = hist ? "hist" : "trigger";
char *p;
if ((p = strstr(event, ":"))) {
system = event;
event = p + 1;
*p = '\0';
}
if (!system) {
systems = tracefs_event_systems(NULL);
for (int i = 0; systems && systems[i]; i++) {
system = systems[i];
if (tracefs_event_file_exists(instance->tracefs,
system, event, file))
break;
}
if (!system)
die("Could not find system of event %s",
event);
}
path = tracefs_event_file_read(instance->tracefs,
system, event, file, NULL);
tracefs_list_free(systems);
if (!path)
die("Could not find hist for %s%s%s",
system ? system : "", system ? ":":"", event);
printf("%s\n", path);
free(path);
exit(0);
}
if (cpu) {
char *endptr;
long val;
errno = 0;
val = strtol(cpu, &endptr, 0);
if (errno || cpu == endptr)
die("Invalid CPU index '%s'", cpu);
snprintf(cpu_path, 128, "per_cpu/cpu%ld/%s", val, file);
file = cpu_path;
}
if (buffer) {
int ret;
ret = asprintf(&path, "instances/%s/%s", buffer, file);
if (ret < 0)
die("Failed to allocate instance path %s", file);
file = path;
}
if (show_name) {
char *name;
name = tracefs_get_tracing_file(file);
printf("%s\n", name);
tracefs_put_tracing_file(name);
}
show_file(file);
if (buffer)
free(path);
return;
}
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