1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * db-export.c: Support for exporting data suitable for import to a database 4 * Copyright (c) 2014, Intel Corporation. 5 */ 6 7 #include <errno.h> 8 #include <stdlib.h> 9 10 #include "dso.h" 11 #include "evsel.h" 12 #include "machine.h" 13 #include "thread.h" 14 #include "comm.h" 15 #include "symbol.h" 16 #include "map.h" 17 #include "event.h" 18 #include "thread-stack.h" 19 #include "callchain.h" 20 #include "call-path.h" 21 #include "db-export.h" 22 #include <linux/zalloc.h> 23 24 int db_export__init(struct db_export *dbe) 25 { 26 memset(dbe, 0, sizeof(struct db_export)); 27 return 0; 28 } 29 30 void db_export__exit(struct db_export *dbe) 31 { 32 call_return_processor__free(dbe->crp); 33 dbe->crp = NULL; 34 } 35 36 int db_export__evsel(struct db_export *dbe, struct evsel *evsel) 37 { 38 if (evsel->db_id) 39 return 0; 40 41 evsel->db_id = ++dbe->evsel_last_db_id; 42 43 if (dbe->export_evsel) 44 return dbe->export_evsel(dbe, evsel); 45 46 return 0; 47 } 48 49 int db_export__machine(struct db_export *dbe, struct machine *machine) 50 { 51 if (machine->db_id) 52 return 0; 53 54 machine->db_id = ++dbe->machine_last_db_id; 55 56 if (dbe->export_machine) 57 return dbe->export_machine(dbe, machine); 58 59 return 0; 60 } 61 62 int db_export__thread(struct db_export *dbe, struct thread *thread, 63 struct machine *machine, struct thread *main_thread) 64 { 65 u64 main_thread_db_id = 0; 66 67 if (thread->db_id) 68 return 0; 69 70 thread->db_id = ++dbe->thread_last_db_id; 71 72 if (main_thread) 73 main_thread_db_id = main_thread->db_id; 74 75 if (dbe->export_thread) 76 return dbe->export_thread(dbe, thread, main_thread_db_id, 77 machine); 78 79 return 0; 80 } 81 82 static int __db_export__comm(struct db_export *dbe, struct comm *comm, 83 struct thread *thread) 84 { 85 comm->db_id = ++dbe->comm_last_db_id; 86 87 if (dbe->export_comm) 88 return dbe->export_comm(dbe, comm, thread); 89 90 return 0; 91 } 92 93 int db_export__comm(struct db_export *dbe, struct comm *comm, 94 struct thread *thread) 95 { 96 if (comm->db_id) 97 return 0; 98 99 return __db_export__comm(dbe, comm, thread); 100 } 101 102 /* 103 * Export the "exec" comm. The "exec" comm is the program / application command 104 * name at the time it first executes. It is used to group threads for the same 105 * program. Note that the main thread pid (or thread group id tgid) cannot be 106 * used because it does not change when a new program is exec'ed. 107 */ 108 int db_export__exec_comm(struct db_export *dbe, struct comm *comm, 109 struct thread *main_thread) 110 { 111 int err; 112 113 if (comm->db_id) 114 return 0; 115 116 err = __db_export__comm(dbe, comm, main_thread); 117 if (err) 118 return err; 119 120 /* 121 * Record the main thread for this comm. Note that the main thread can 122 * have many "exec" comms because there will be a new one every time it 123 * exec's. An "exec" comm however will only ever have 1 main thread. 124 * That is different to any other threads for that same program because 125 * exec() will effectively kill them, so the relationship between the 126 * "exec" comm and non-main threads is 1-to-1. That is why 127 * db_export__comm_thread() is called here for the main thread, but it 128 * is called for non-main threads when they are exported. 129 */ 130 return db_export__comm_thread(dbe, comm, main_thread); 131 } 132 133 int db_export__comm_thread(struct db_export *dbe, struct comm *comm, 134 struct thread *thread) 135 { 136 u64 db_id; 137 138 db_id = ++dbe->comm_thread_last_db_id; 139 140 if (dbe->export_comm_thread) 141 return dbe->export_comm_thread(dbe, db_id, comm, thread); 142 143 return 0; 144 } 145 146 int db_export__dso(struct db_export *dbe, struct dso *dso, 147 struct machine *machine) 148 { 149 if (dso->db_id) 150 return 0; 151 152 dso->db_id = ++dbe->dso_last_db_id; 153 154 if (dbe->export_dso) 155 return dbe->export_dso(dbe, dso, machine); 156 157 return 0; 158 } 159 160 int db_export__symbol(struct db_export *dbe, struct symbol *sym, 161 struct dso *dso) 162 { 163 u64 *sym_db_id = symbol__priv(sym); 164 165 if (*sym_db_id) 166 return 0; 167 168 *sym_db_id = ++dbe->symbol_last_db_id; 169 170 if (dbe->export_symbol) 171 return dbe->export_symbol(dbe, sym, dso); 172 173 return 0; 174 } 175 176 static int db_ids_from_al(struct db_export *dbe, struct addr_location *al, 177 u64 *dso_db_id, u64 *sym_db_id, u64 *offset) 178 { 179 int err; 180 181 if (al->map) { 182 struct dso *dso = al->map->dso; 183 184 err = db_export__dso(dbe, dso, al->machine); 185 if (err) 186 return err; 187 *dso_db_id = dso->db_id; 188 189 if (!al->sym) { 190 al->sym = symbol__new(al->addr, 0, 0, 0, "unknown"); 191 if (al->sym) 192 dso__insert_symbol(dso, al->sym); 193 } 194 195 if (al->sym) { 196 u64 *db_id = symbol__priv(al->sym); 197 198 err = db_export__symbol(dbe, al->sym, dso); 199 if (err) 200 return err; 201 *sym_db_id = *db_id; 202 *offset = al->addr - al->sym->start; 203 } 204 } 205 206 return 0; 207 } 208 209 static struct call_path *call_path_from_sample(struct db_export *dbe, 210 struct machine *machine, 211 struct thread *thread, 212 struct perf_sample *sample, 213 struct evsel *evsel) 214 { 215 u64 kernel_start = machine__kernel_start(machine); 216 struct call_path *current = &dbe->cpr->call_path; 217 enum chain_order saved_order = callchain_param.order; 218 int err; 219 220 if (!symbol_conf.use_callchain || !sample->callchain) 221 return NULL; 222 223 /* 224 * Since the call path tree must be built starting with the root, we 225 * must use ORDER_CALL for call chain resolution, in order to process 226 * the callchain starting with the root node and ending with the leaf. 227 */ 228 callchain_param.order = ORDER_CALLER; 229 err = thread__resolve_callchain(thread, &callchain_cursor, evsel, 230 sample, NULL, NULL, PERF_MAX_STACK_DEPTH); 231 if (err) { 232 callchain_param.order = saved_order; 233 return NULL; 234 } 235 callchain_cursor_commit(&callchain_cursor); 236 237 while (1) { 238 struct callchain_cursor_node *node; 239 struct addr_location al; 240 u64 dso_db_id = 0, sym_db_id = 0, offset = 0; 241 242 memset(&al, 0, sizeof(al)); 243 244 node = callchain_cursor_current(&callchain_cursor); 245 if (!node) 246 break; 247 /* 248 * Handle export of symbol and dso for this node by 249 * constructing an addr_location struct and then passing it to 250 * db_ids_from_al() to perform the export. 251 */ 252 al.sym = node->sym; 253 al.map = node->map; 254 al.machine = machine; 255 al.addr = node->ip; 256 257 if (al.map && !al.sym) 258 al.sym = dso__find_symbol(al.map->dso, al.addr); 259 260 db_ids_from_al(dbe, &al, &dso_db_id, &sym_db_id, &offset); 261 262 /* add node to the call path tree if it doesn't exist */ 263 current = call_path__findnew(dbe->cpr, current, 264 al.sym, node->ip, 265 kernel_start); 266 267 callchain_cursor_advance(&callchain_cursor); 268 } 269 270 /* Reset the callchain order to its prior value. */ 271 callchain_param.order = saved_order; 272 273 if (current == &dbe->cpr->call_path) { 274 /* Bail because the callchain was empty. */ 275 return NULL; 276 } 277 278 return current; 279 } 280 281 int db_export__branch_type(struct db_export *dbe, u32 branch_type, 282 const char *name) 283 { 284 if (dbe->export_branch_type) 285 return dbe->export_branch_type(dbe, branch_type, name); 286 287 return 0; 288 } 289 290 static int db_export__threads(struct db_export *dbe, struct thread *thread, 291 struct thread *main_thread, 292 struct machine *machine, struct comm **comm_ptr) 293 { 294 struct comm *comm = NULL; 295 struct comm *curr_comm; 296 int err; 297 298 if (main_thread) { 299 /* 300 * A thread has a reference to the main thread, so export the 301 * main thread first. 302 */ 303 err = db_export__thread(dbe, main_thread, machine, main_thread); 304 if (err) 305 return err; 306 /* 307 * Export comm before exporting the non-main thread because 308 * db_export__comm_thread() can be called further below. 309 */ 310 comm = machine__thread_exec_comm(machine, main_thread); 311 if (comm) { 312 err = db_export__exec_comm(dbe, comm, main_thread); 313 if (err) 314 return err; 315 *comm_ptr = comm; 316 } 317 } 318 319 if (thread != main_thread) { 320 /* 321 * For a non-main thread, db_export__comm_thread() must be 322 * called only if thread has not previously been exported. 323 */ 324 bool export_comm_thread = comm && !thread->db_id; 325 326 err = db_export__thread(dbe, thread, machine, main_thread); 327 if (err) 328 return err; 329 330 if (export_comm_thread) { 331 err = db_export__comm_thread(dbe, comm, thread); 332 if (err) 333 return err; 334 } 335 } 336 337 curr_comm = thread__comm(thread); 338 if (curr_comm) 339 return db_export__comm(dbe, curr_comm, thread); 340 341 return 0; 342 } 343 344 int db_export__sample(struct db_export *dbe, union perf_event *event, 345 struct perf_sample *sample, struct evsel *evsel, 346 struct addr_location *al) 347 { 348 struct thread *thread = al->thread; 349 struct export_sample es = { 350 .event = event, 351 .sample = sample, 352 .evsel = evsel, 353 .al = al, 354 }; 355 struct thread *main_thread; 356 struct comm *comm = NULL; 357 int err; 358 359 err = db_export__evsel(dbe, evsel); 360 if (err) 361 return err; 362 363 err = db_export__machine(dbe, al->machine); 364 if (err) 365 return err; 366 367 main_thread = thread__main_thread(al->machine, thread); 368 369 err = db_export__threads(dbe, thread, main_thread, al->machine, &comm); 370 if (err) 371 goto out_put; 372 373 if (comm) 374 es.comm_db_id = comm->db_id; 375 376 es.db_id = ++dbe->sample_last_db_id; 377 378 err = db_ids_from_al(dbe, al, &es.dso_db_id, &es.sym_db_id, &es.offset); 379 if (err) 380 goto out_put; 381 382 if (dbe->cpr) { 383 struct call_path *cp = call_path_from_sample(dbe, al->machine, 384 thread, sample, 385 evsel); 386 if (cp) { 387 db_export__call_path(dbe, cp); 388 es.call_path_id = cp->db_id; 389 } 390 } 391 392 if ((evsel->core.attr.sample_type & PERF_SAMPLE_ADDR) && 393 sample_addr_correlates_sym(&evsel->core.attr)) { 394 struct addr_location addr_al; 395 396 thread__resolve(thread, &addr_al, sample); 397 err = db_ids_from_al(dbe, &addr_al, &es.addr_dso_db_id, 398 &es.addr_sym_db_id, &es.addr_offset); 399 if (err) 400 goto out_put; 401 if (dbe->crp) { 402 err = thread_stack__process(thread, comm, sample, al, 403 &addr_al, es.db_id, 404 dbe->crp); 405 if (err) 406 goto out_put; 407 } 408 } 409 410 if (dbe->export_sample) 411 err = dbe->export_sample(dbe, &es); 412 413 out_put: 414 thread__put(main_thread); 415 return err; 416 } 417 418 static struct { 419 u32 branch_type; 420 const char *name; 421 } branch_types[] = { 422 {0, "no branch"}, 423 {PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_CALL, "call"}, 424 {PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_RETURN, "return"}, 425 {PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_CONDITIONAL, "conditional jump"}, 426 {PERF_IP_FLAG_BRANCH, "unconditional jump"}, 427 {PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_CALL | PERF_IP_FLAG_INTERRUPT, 428 "software interrupt"}, 429 {PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_RETURN | PERF_IP_FLAG_INTERRUPT, 430 "return from interrupt"}, 431 {PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_CALL | PERF_IP_FLAG_SYSCALLRET, 432 "system call"}, 433 {PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_RETURN | PERF_IP_FLAG_SYSCALLRET, 434 "return from system call"}, 435 {PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_ASYNC, "asynchronous branch"}, 436 {PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_CALL | PERF_IP_FLAG_ASYNC | 437 PERF_IP_FLAG_INTERRUPT, "hardware interrupt"}, 438 {PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_TX_ABORT, "transaction abort"}, 439 {PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_TRACE_BEGIN, "trace begin"}, 440 {PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_TRACE_END, "trace end"}, 441 {0, NULL} 442 }; 443 444 int db_export__branch_types(struct db_export *dbe) 445 { 446 int i, err = 0; 447 448 for (i = 0; branch_types[i].name ; i++) { 449 err = db_export__branch_type(dbe, branch_types[i].branch_type, 450 branch_types[i].name); 451 if (err) 452 break; 453 } 454 455 /* Add trace begin / end variants */ 456 for (i = 0; branch_types[i].name ; i++) { 457 const char *name = branch_types[i].name; 458 u32 type = branch_types[i].branch_type; 459 char buf[64]; 460 461 if (type == PERF_IP_FLAG_BRANCH || 462 (type & (PERF_IP_FLAG_TRACE_BEGIN | PERF_IP_FLAG_TRACE_END))) 463 continue; 464 465 snprintf(buf, sizeof(buf), "trace begin / %s", name); 466 err = db_export__branch_type(dbe, type | PERF_IP_FLAG_TRACE_BEGIN, buf); 467 if (err) 468 break; 469 470 snprintf(buf, sizeof(buf), "%s / trace end", name); 471 err = db_export__branch_type(dbe, type | PERF_IP_FLAG_TRACE_END, buf); 472 if (err) 473 break; 474 } 475 476 return err; 477 } 478 479 int db_export__call_path(struct db_export *dbe, struct call_path *cp) 480 { 481 int err; 482 483 if (cp->db_id) 484 return 0; 485 486 if (cp->parent) { 487 err = db_export__call_path(dbe, cp->parent); 488 if (err) 489 return err; 490 } 491 492 cp->db_id = ++dbe->call_path_last_db_id; 493 494 if (dbe->export_call_path) 495 return dbe->export_call_path(dbe, cp); 496 497 return 0; 498 } 499 500 int db_export__call_return(struct db_export *dbe, struct call_return *cr, 501 u64 *parent_db_id) 502 { 503 int err; 504 505 err = db_export__call_path(dbe, cr->cp); 506 if (err) 507 return err; 508 509 if (!cr->db_id) 510 cr->db_id = ++dbe->call_return_last_db_id; 511 512 if (parent_db_id) { 513 if (!*parent_db_id) 514 *parent_db_id = ++dbe->call_return_last_db_id; 515 cr->parent_db_id = *parent_db_id; 516 } 517 518 if (dbe->export_call_return) 519 return dbe->export_call_return(dbe, cr); 520 521 return 0; 522 } 523 524 static int db_export__pid_tid(struct db_export *dbe, struct machine *machine, 525 pid_t pid, pid_t tid, u64 *db_id, 526 struct comm **comm_ptr, bool *is_idle) 527 { 528 struct thread *thread = machine__find_thread(machine, pid, tid); 529 struct thread *main_thread; 530 int err = 0; 531 532 if (!thread || !thread->comm_set) 533 goto out_put; 534 535 *is_idle = !thread->pid_ && !thread->tid; 536 537 main_thread = thread__main_thread(machine, thread); 538 539 err = db_export__threads(dbe, thread, main_thread, machine, comm_ptr); 540 541 *db_id = thread->db_id; 542 543 thread__put(main_thread); 544 out_put: 545 thread__put(thread); 546 547 return err; 548 } 549 550 int db_export__switch(struct db_export *dbe, union perf_event *event, 551 struct perf_sample *sample, struct machine *machine) 552 { 553 bool out = event->header.misc & PERF_RECORD_MISC_SWITCH_OUT; 554 bool out_preempt = out && 555 (event->header.misc & PERF_RECORD_MISC_SWITCH_OUT_PREEMPT); 556 int flags = out | (out_preempt << 1); 557 bool is_idle_a = false, is_idle_b = false; 558 u64 th_a_id = 0, th_b_id = 0; 559 u64 comm_out_id, comm_in_id; 560 struct comm *comm_a = NULL; 561 struct comm *comm_b = NULL; 562 u64 th_out_id, th_in_id; 563 u64 db_id; 564 int err; 565 566 err = db_export__machine(dbe, machine); 567 if (err) 568 return err; 569 570 err = db_export__pid_tid(dbe, machine, sample->pid, sample->tid, 571 &th_a_id, &comm_a, &is_idle_a); 572 if (err) 573 return err; 574 575 if (event->header.type == PERF_RECORD_SWITCH_CPU_WIDE) { 576 pid_t pid = event->context_switch.next_prev_pid; 577 pid_t tid = event->context_switch.next_prev_tid; 578 579 err = db_export__pid_tid(dbe, machine, pid, tid, &th_b_id, 580 &comm_b, &is_idle_b); 581 if (err) 582 return err; 583 } 584 585 /* 586 * Do not export if both threads are unknown (i.e. not being traced), 587 * or one is unknown and the other is the idle task. 588 */ 589 if ((!th_a_id || is_idle_a) && (!th_b_id || is_idle_b)) 590 return 0; 591 592 db_id = ++dbe->context_switch_last_db_id; 593 594 if (out) { 595 th_out_id = th_a_id; 596 th_in_id = th_b_id; 597 comm_out_id = comm_a ? comm_a->db_id : 0; 598 comm_in_id = comm_b ? comm_b->db_id : 0; 599 } else { 600 th_out_id = th_b_id; 601 th_in_id = th_a_id; 602 comm_out_id = comm_b ? comm_b->db_id : 0; 603 comm_in_id = comm_a ? comm_a->db_id : 0; 604 } 605 606 if (dbe->export_context_switch) 607 return dbe->export_context_switch(dbe, db_id, machine, sample, 608 th_out_id, comm_out_id, 609 th_in_id, comm_in_id, flags); 610 return 0; 611 } 612