tools/perf/builtin-inject.c

   1 /*
   2  * builtin-inject.c
   3  *
   4  * Builtin inject command: Examine the live mode (stdin) event stream
   5  * and repipe it to stdout while optionally injecting additional
   6  * events into it.
   7  */
   8 #include "builtin.h"
   9
  10 #include "perf.h"
  11 #include "util/color.h"
  12 #include "util/evlist.h"
  13 #include "util/evsel.h"
  14 #include "util/session.h"
  15 #include "util/tool.h"
  16 #include "util/debug.h"
  17 #include "util/build-id.h"
  18
  19 #include "util/parse-options.h"
  20
  21 #include <linux/list.h>
  22
  23 struct perf_inject {
  24         struct perf_tool tool;
  25         bool             build_ids;
  26         bool             sched_stat;
  27         const char       *input_name;
  28         int              pipe_output,
  29                          output;
  30         u64              bytes_written;
  31         struct list_head samples;
  32 };
  33
  34 struct event_entry {
  35         struct list_head node;
  36         u32              tid;
  37         union perf_event event[0];
  38 };
  39
  40 static int perf_event__repipe_synth(struct perf_tool *tool,
  41                                     union perf_event *event)
  42 {
  43         struct perf_inject *inject = container_of(tool, struct perf_inject, tool);
  44         uint32_t size;
  45         void *buf = event;
  46
  47         size = event->header.size;
  48
  49         while (size) {
  50                 int ret = write(inject->output, buf, size);
  51                 if (ret < 0)
  52                         return -errno;
  53
  54                 size -= ret;
  55                 buf += ret;
  56                 inject->bytes_written += ret;
  57         }
  58
  59         return 0;
  60 }
  61
  62 static int perf_event__repipe_op2_synth(struct perf_tool *tool,
  63                                         union perf_event *event,
  64                                         struct perf_session *session
  65                                         __maybe_unused)
  66 {
  67         return perf_event__repipe_synth(tool, event);
  68 }
  69
  70 static int perf_event__repipe_attr(struct perf_tool *tool,
  71                                    union perf_event *event,
  72                                    struct perf_evlist **pevlist)
  73 {
  74         int ret;
  75
  76         ret = perf_event__process_attr(tool, event, pevlist);
  77         if (ret)
  78                 return ret;
  79
  80         return perf_event__repipe_synth(tool, event);
  81 }
  82
  83 static int perf_event__repipe(struct perf_tool *tool,
  84                               union perf_event *event,
  85                               struct perf_sample *sample __maybe_unused,
  86                               struct machine *machine __maybe_unused)
  87 {
  88         return perf_event__repipe_synth(tool, event);
  89 }
  90
  91 typedef int (*inject_handler)(struct perf_tool *tool,
  92                               union perf_event *event,
  93                               struct perf_sample *sample,
  94                               struct perf_evsel *evsel,
  95                               struct machine *machine);
  96
  97 static int perf_event__repipe_sample(struct perf_tool *tool,
  98                                      union perf_event *event,
  99                                      struct perf_sample *sample,
 100                                      struct perf_evsel *evsel,
 101                                      struct machine *machine)
 102 {
 103         if (evsel->handler.func) {
 104                 inject_handler f = evsel->handler.func;
 105                 return f(tool, event, sample, evsel, machine);
 106         }
 107
 108         build_id__mark_dso_hit(tool, event, sample, evsel, machine);
 109
 110         return perf_event__repipe_synth(tool, event);
 111 }
 112
 113 static int perf_event__repipe_mmap(struct perf_tool *tool,
 114                                    union perf_event *event,
 115                                    struct perf_sample *sample,
 116                                    struct machine *machine)
 117 {
 118         int err;
 119
 120         err = perf_event__process_mmap(tool, event, sample, machine);
 121         perf_event__repipe(tool, event, sample, machine);
 122
 123         return err;
 124 }
 125
 126 static int perf_event__repipe_fork(struct perf_tool *tool,
 127                                    union perf_event *event,
 128                                    struct perf_sample *sample,
 129                                    struct machine *machine)
 130 {
 131         int err;
 132
 133         err = perf_event__process_fork(tool, event, sample, machine);
 134         perf_event__repipe(tool, event, sample, machine);
 135
 136         return err;
 137 }
 138
 139 static int perf_event__repipe_tracing_data(struct perf_tool *tool,
 140                                            union perf_event *event,
 141                                            struct perf_session *session)
 142 {
 143         int err;
 144
 145         perf_event__repipe_synth(tool, event);
 146         err = perf_event__process_tracing_data(tool, event, session);
 147
 148         return err;
 149 }
 150
 151 static int dso__read_build_id(struct dso *self)
 152 {
 153         if (self->has_build_id)
 154                 return 0;
 155
 156         if (filename__read_build_id(self->long_name, self->build_id,
 157                                     sizeof(self->build_id)) > 0) {
 158                 self->has_build_id = true;
 159                 return 0;
 160         }
 161
 162         return -1;
 163 }
 164
 165 static int dso__inject_build_id(struct dso *self, struct perf_tool *tool,
 166                                 struct machine *machine)
 167 {
 168         u16 misc = PERF_RECORD_MISC_USER;
 169         int err;
 170
 171         if (dso__read_build_id(self) < 0) {
 172                 pr_debug("no build_id found for %s\n", self->long_name);
 173                 return -1;
 174         }
 175
 176         if (self->kernel)
 177                 misc = PERF_RECORD_MISC_KERNEL;
 178
 179         err = perf_event__synthesize_build_id(tool, self, misc, perf_event__repipe,
 180                                               machine);
 181         if (err) {
 182                 pr_err("Can't synthesize build_id event for %s\n", self->long_name);
 183                 return -1;
 184         }
 185
 186         return 0;
 187 }
 188
 189 static int perf_event__inject_buildid(struct perf_tool *tool,
 190                                       union perf_event *event,
 191                                       struct perf_sample *sample,
 192                                       struct perf_evsel *evsel __maybe_unused,
 193                                       struct machine *machine)
 194 {
 195         struct addr_location al;
 196         struct thread *thread;
 197         u8 cpumode;
 198
 199         cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 200
 201         thread = machine__findnew_thread(machine, sample->pid, sample->pid);
 202         if (thread == NULL) {
 203                 pr_err("problem processing %d event, skipping it.\n",
 204                        event->header.type);
 205                 goto repipe;
 206         }
 207
 208         thread__find_addr_map(thread, machine, cpumode, MAP__FUNCTION,
 209                               sample->ip, &al);
 210
 211         if (al.map != NULL) {
 212                 if (!al.map->dso->hit) {
 213                         al.map->dso->hit = 1;
 214                         if (map__load(al.map, NULL) >= 0) {
 215                                 dso__inject_build_id(al.map->dso, tool, machine);
 216                                 /*
 217                                  * If this fails, too bad, let the other side
 218                                  * account this as unresolved.
 219                                  */
 220                         } else {
 221 #ifdef LIBELF_SUPPORT
 222                                 pr_warning("no symbols found in %s, maybe "
 223                                            "install a debug package?\n",
 224                                            al.map->dso->long_name);
 225 #endif
 226                         }
 227                 }
 228         }
 229
 230 repipe:
 231         perf_event__repipe(tool, event, sample, machine);
 232         return 0;
 233 }
 234
 235 static int perf_inject__sched_process_exit(struct perf_tool *tool,
 236                                            union perf_event *event __maybe_unused,
 237                                            struct perf_sample *sample,
 238                                            struct perf_evsel *evsel __maybe_unused,
 239                                            struct machine *machine __maybe_unused)
 240 {
 241         struct perf_inject *inject = container_of(tool, struct perf_inject, tool);
 242         struct event_entry *ent;
 243
 244         list_for_each_entry(ent, &inject->samples, node) {
 245                 if (sample->tid == ent->tid) {
 246                         list_del_init(&ent->node);
 247                         free(ent);
 248                         break;
 249                 }
 250         }
 251
 252         return 0;
 253 }
 254
 255 static int perf_inject__sched_switch(struct perf_tool *tool,
 256                                      union perf_event *event,
 257                                      struct perf_sample *sample,
 258                                      struct perf_evsel *evsel,
 259                                      struct machine *machine)
 260 {
 261         struct perf_inject *inject = container_of(tool, struct perf_inject, tool);
 262         struct event_entry *ent;
 263
 264         perf_inject__sched_process_exit(tool, event, sample, evsel, machine);
 265
 266         ent = malloc(event->header.size + sizeof(struct event_entry));
 267         if (ent == NULL) {
 268                 color_fprintf(stderr, PERF_COLOR_RED,
 269                              "Not enough memory to process sched switch event!");
 270                 return -1;
 271         }
 272
 273         ent->tid = sample->tid;
 274         memcpy(&ent->event, event, event->header.size);
 275         list_add(&ent->node, &inject->samples);
 276         return 0;
 277 }
 278
 279 static int perf_inject__sched_stat(struct perf_tool *tool,
 280                                    union perf_event *event __maybe_unused,
 281                                    struct perf_sample *sample,
 282                                    struct perf_evsel *evsel,
 283                                    struct machine *machine)
 284 {
 285         struct event_entry *ent;
 286         union perf_event *event_sw;
 287         struct perf_sample sample_sw;
 288         struct perf_inject *inject = container_of(tool, struct perf_inject, tool);
 289         u32 pid = perf_evsel__intval(evsel, sample, "pid");
 290
 291         list_for_each_entry(ent, &inject->samples, node) {
 292                 if (pid == ent->tid)
 293                         goto found;
 294         }
 295
 296         return 0;
 297 found:
 298         event_sw = &ent->event[0];
 299         perf_evsel__parse_sample(evsel, event_sw, &sample_sw);
 300
 301         sample_sw.period = sample->period;
 302         sample_sw.time   = sample->time;
 303         perf_event__synthesize_sample(event_sw, evsel->attr.sample_type,
 304                                       &sample_sw, false);
 305         build_id__mark_dso_hit(tool, event_sw, &sample_sw, evsel, machine);
 306         return perf_event__repipe(tool, event_sw, &sample_sw, machine);
 307 }
 308
 309 extern volatile int session_done;
 310
 311 static void sig_handler(int sig __maybe_unused)
 312 {
 313         session_done = 1;
 314 }
 315
 316 static int perf_evsel__check_stype(struct perf_evsel *evsel,
 317                                    u64 sample_type, const char *sample_msg)
 318 {
 319         struct perf_event_attr *attr = &evsel->attr;
 320         const char *name = perf_evsel__name(evsel);
 321
 322         if (!(attr->sample_type & sample_type)) {
 323                 pr_err("Samples for %s event do not have %s attribute set.",
 324                         name, sample_msg);
 325                 return -EINVAL;
 326         }
 327
 328         return 0;
 329 }
 330
 331 static int __cmd_inject(struct perf_inject *inject)
 332 {
 333         struct perf_session *session;
 334         int ret = -EINVAL;
 335
 336         signal(SIGINT, sig_handler);
 337
 338         if (inject->build_ids || inject->sched_stat) {
 339                 inject->tool.mmap         = perf_event__repipe_mmap;
 340                 inject->tool.fork         = perf_event__repipe_fork;
 341                 inject->tool.tracing_data = perf_event__repipe_tracing_data;
 342         }
 343
 344         session = perf_session__new(inject->input_name, O_RDONLY, false, true, &inject->tool);
 345         if (session == NULL)
 346                 return -ENOMEM;
 347
 348         if (inject->build_ids) {
 349                 inject->tool.sample = perf_event__inject_buildid;
 350         } else if (inject->sched_stat) {
 351                 struct perf_evsel *evsel;
 352
 353                 inject->tool.ordered_samples = true;
 354
 355                 list_for_each_entry(evsel, &session->evlist->entries, node) {
 356                         const char *name = perf_evsel__name(evsel);
 357
 358                         if (!strcmp(name, "sched:sched_switch")) {
 359                                 if (perf_evsel__check_stype(evsel, PERF_SAMPLE_TID, "TID"))
 360                                         return -EINVAL;
 361
 362                                 evsel->handler.func = perf_inject__sched_switch;
 363                         } else if (!strcmp(name, "sched:sched_process_exit"))
 364                                 evsel->handler.func = perf_inject__sched_process_exit;
 365                         else if (!strncmp(name, "sched:sched_stat_", 17))
 366                                 evsel->handler.func = perf_inject__sched_stat;
 367                 }
 368         }
 369
 370         if (!inject->pipe_output)
 371                 lseek(inject->output, session->header.data_offset, SEEK_SET);
 372
 373         ret = perf_session__process_events(session, &inject->tool);
 374
 375         if (!inject->pipe_output) {
 376                 session->header.data_size = inject->bytes_written;
 377                 perf_session__write_header(session, session->evlist, inject->output, true);
 378         }
 379
 380         perf_session__delete(session);
 381
 382         return ret;
 383 }
 384
 385 int cmd_inject(int argc, const char **argv, const char *prefix __maybe_unused)
 386 {
 387         struct perf_inject inject = {
 388                 .tool = {
 389                         .sample         = perf_event__repipe_sample,
 390                         .mmap           = perf_event__repipe,
 391                         .comm           = perf_event__repipe,
 392                         .fork           = perf_event__repipe,
 393                         .exit           = perf_event__repipe,
 394                         .lost           = perf_event__repipe,
 395                         .read           = perf_event__repipe_sample,
 396                         .throttle       = perf_event__repipe,
 397                         .unthrottle     = perf_event__repipe,
 398                         .attr           = perf_event__repipe_attr,
 399                         .tracing_data   = perf_event__repipe_op2_synth,
 400                         .finished_round = perf_event__repipe_op2_synth,
 401                         .build_id       = perf_event__repipe_op2_synth,
 402                 },
 403                 .input_name  = "-",
 404                 .samples = LIST_HEAD_INIT(inject.samples),
 405         };
 406         const char *output_name = "-";
 407         const struct option options[] = {
 408                 OPT_BOOLEAN('b', "build-ids", &inject.build_ids,
 409                             "Inject build-ids into the output stream"),
 410                 OPT_STRING('i', "input", &inject.input_name, "file",
 411                            "input file name"),
 412                 OPT_STRING('o', "output", &output_name, "file",
 413                            "output file name"),
 414                 OPT_BOOLEAN('s', "sched-stat", &inject.sched_stat,
 415                             "Merge sched-stat and sched-switch for getting events "
 416                             "where and how long tasks slept"),
 417                 OPT_INCR('v', "verbose", &verbose,
 418                          "be more verbose (show build ids, etc)"),
 419                 OPT_END()
 420         };
 421         const char * const inject_usage[] = {
 422                 "perf inject [<options>]",
 423                 NULL
 424         };
 425
 426         argc = parse_options(argc, argv, options, inject_usage, 0);
 427
 428         /*
 429          * Any (unrecognized) arguments left?
 430          */
 431         if (argc)
 432                 usage_with_options(inject_usage, options);
 433
 434         if (!strcmp(output_name, "-")) {
 435                 inject.pipe_output = 1;
 436                 inject.output = STDOUT_FILENO;
 437         } else {
 438                 inject.output = open(output_name, O_CREAT | O_WRONLY | O_TRUNC,
 439                                                   S_IRUSR | S_IWUSR);
 440                 if (inject.output < 0) {
 441                         perror("failed to create output file");
 442                         return -1;
 443                 }
 444         }
 445
 446         if (symbol__init() < 0)
 447                 return -1;
 448
 449         return __cmd_inject(&inject);
 450 }