1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * trace_output.c 4 * 5 * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com> 6 * 7 */ 8 #include <linux/module.h> 9 #include <linux/mutex.h> 10 #include <linux/ftrace.h> 11 #include <linux/sched/clock.h> 12 #include <linux/sched/mm.h> 13 14 #include "trace_output.h" 15 16 /* must be a power of 2 */ 17 #define EVENT_HASHSIZE 128 18 19 DECLARE_RWSEM(trace_event_sem); 20 21 static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly; 22 23 static int next_event_type = __TRACE_LAST_TYPE + 1; 24 25 enum print_line_t trace_print_bputs_msg_only(struct trace_iterator *iter) 26 { 27 struct trace_seq *s = &iter->seq; 28 struct trace_entry *entry = iter->ent; 29 struct bputs_entry *field; 30 31 trace_assign_type(field, entry); 32 33 trace_seq_puts(s, field->str); 34 35 return trace_handle_return(s); 36 } 37 38 enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter) 39 { 40 struct trace_seq *s = &iter->seq; 41 struct trace_entry *entry = iter->ent; 42 struct bprint_entry *field; 43 44 trace_assign_type(field, entry); 45 46 trace_seq_bprintf(s, field->fmt, field->buf); 47 48 return trace_handle_return(s); 49 } 50 51 enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter) 52 { 53 struct trace_seq *s = &iter->seq; 54 struct trace_entry *entry = iter->ent; 55 struct print_entry *field; 56 57 trace_assign_type(field, entry); 58 59 trace_seq_puts(s, field->buf); 60 61 return trace_handle_return(s); 62 } 63 64 const char * 65 trace_print_flags_seq(struct trace_seq *p, const char *delim, 66 unsigned long flags, 67 const struct trace_print_flags *flag_array) 68 { 69 unsigned long mask; 70 const char *str; 71 const char *ret = trace_seq_buffer_ptr(p); 72 int i, first = 1; 73 74 for (i = 0; flag_array[i].name && flags; i++) { 75 76 mask = flag_array[i].mask; 77 if ((flags & mask) != mask) 78 continue; 79 80 str = flag_array[i].name; 81 flags &= ~mask; 82 if (!first && delim) 83 trace_seq_puts(p, delim); 84 else 85 first = 0; 86 trace_seq_puts(p, str); 87 } 88 89 /* check for left over flags */ 90 if (flags) { 91 if (!first && delim) 92 trace_seq_puts(p, delim); 93 trace_seq_printf(p, "0x%lx", flags); 94 } 95 96 trace_seq_putc(p, 0); 97 98 return ret; 99 } 100 EXPORT_SYMBOL(trace_print_flags_seq); 101 102 const char * 103 trace_print_symbols_seq(struct trace_seq *p, unsigned long val, 104 const struct trace_print_flags *symbol_array) 105 { 106 int i; 107 const char *ret = trace_seq_buffer_ptr(p); 108 109 for (i = 0; symbol_array[i].name; i++) { 110 111 if (val != symbol_array[i].mask) 112 continue; 113 114 trace_seq_puts(p, symbol_array[i].name); 115 break; 116 } 117 118 if (ret == (const char *)(trace_seq_buffer_ptr(p))) 119 trace_seq_printf(p, "0x%lx", val); 120 121 trace_seq_putc(p, 0); 122 123 return ret; 124 } 125 EXPORT_SYMBOL(trace_print_symbols_seq); 126 127 #if BITS_PER_LONG == 32 128 const char * 129 trace_print_flags_seq_u64(struct trace_seq *p, const char *delim, 130 unsigned long long flags, 131 const struct trace_print_flags_u64 *flag_array) 132 { 133 unsigned long long mask; 134 const char *str; 135 const char *ret = trace_seq_buffer_ptr(p); 136 int i, first = 1; 137 138 for (i = 0; flag_array[i].name && flags; i++) { 139 140 mask = flag_array[i].mask; 141 if ((flags & mask) != mask) 142 continue; 143 144 str = flag_array[i].name; 145 flags &= ~mask; 146 if (!first && delim) 147 trace_seq_puts(p, delim); 148 else 149 first = 0; 150 trace_seq_puts(p, str); 151 } 152 153 /* check for left over flags */ 154 if (flags) { 155 if (!first && delim) 156 trace_seq_puts(p, delim); 157 trace_seq_printf(p, "0x%llx", flags); 158 } 159 160 trace_seq_putc(p, 0); 161 162 return ret; 163 } 164 EXPORT_SYMBOL(trace_print_flags_seq_u64); 165 166 const char * 167 trace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val, 168 const struct trace_print_flags_u64 *symbol_array) 169 { 170 int i; 171 const char *ret = trace_seq_buffer_ptr(p); 172 173 for (i = 0; symbol_array[i].name; i++) { 174 175 if (val != symbol_array[i].mask) 176 continue; 177 178 trace_seq_puts(p, symbol_array[i].name); 179 break; 180 } 181 182 if (ret == (const char *)(trace_seq_buffer_ptr(p))) 183 trace_seq_printf(p, "0x%llx", val); 184 185 trace_seq_putc(p, 0); 186 187 return ret; 188 } 189 EXPORT_SYMBOL(trace_print_symbols_seq_u64); 190 #endif 191 192 const char * 193 trace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr, 194 unsigned int bitmask_size) 195 { 196 const char *ret = trace_seq_buffer_ptr(p); 197 198 trace_seq_bitmask(p, bitmask_ptr, bitmask_size * 8); 199 trace_seq_putc(p, 0); 200 201 return ret; 202 } 203 EXPORT_SYMBOL_GPL(trace_print_bitmask_seq); 204 205 /** 206 * trace_print_hex_seq - print buffer as hex sequence 207 * @p: trace seq struct to write to 208 * @buf: The buffer to print 209 * @buf_len: Length of @buf in bytes 210 * @concatenate: Print @buf as single hex string or with spacing 211 * 212 * Prints the passed buffer as a hex sequence either as a whole, 213 * single hex string if @concatenate is true or with spacing after 214 * each byte in case @concatenate is false. 215 */ 216 const char * 217 trace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len, 218 bool concatenate) 219 { 220 int i; 221 const char *ret = trace_seq_buffer_ptr(p); 222 const char *fmt = concatenate ? "%*phN" : "%*ph"; 223 224 for (i = 0; i < buf_len; i += 16) 225 trace_seq_printf(p, fmt, min(buf_len - i, 16), &buf[i]); 226 trace_seq_putc(p, 0); 227 228 return ret; 229 } 230 EXPORT_SYMBOL(trace_print_hex_seq); 231 232 const char * 233 trace_print_array_seq(struct trace_seq *p, const void *buf, int count, 234 size_t el_size) 235 { 236 const char *ret = trace_seq_buffer_ptr(p); 237 const char *prefix = ""; 238 void *ptr = (void *)buf; 239 size_t buf_len = count * el_size; 240 241 trace_seq_putc(p, '{'); 242 243 while (ptr < buf + buf_len) { 244 switch (el_size) { 245 case 1: 246 trace_seq_printf(p, "%s0x%x", prefix, 247 *(u8 *)ptr); 248 break; 249 case 2: 250 trace_seq_printf(p, "%s0x%x", prefix, 251 *(u16 *)ptr); 252 break; 253 case 4: 254 trace_seq_printf(p, "%s0x%x", prefix, 255 *(u32 *)ptr); 256 break; 257 case 8: 258 trace_seq_printf(p, "%s0x%llx", prefix, 259 *(u64 *)ptr); 260 break; 261 default: 262 trace_seq_printf(p, "BAD SIZE:%zu 0x%x", el_size, 263 *(u8 *)ptr); 264 el_size = 1; 265 } 266 prefix = ","; 267 ptr += el_size; 268 } 269 270 trace_seq_putc(p, '}'); 271 trace_seq_putc(p, 0); 272 273 return ret; 274 } 275 EXPORT_SYMBOL(trace_print_array_seq); 276 277 const char * 278 trace_print_hex_dump_seq(struct trace_seq *p, const char *prefix_str, 279 int prefix_type, int rowsize, int groupsize, 280 const void *buf, size_t len, bool ascii) 281 { 282 const char *ret = trace_seq_buffer_ptr(p); 283 284 trace_seq_putc(p, '\n'); 285 trace_seq_hex_dump(p, prefix_str, prefix_type, 286 rowsize, groupsize, buf, len, ascii); 287 trace_seq_putc(p, 0); 288 return ret; 289 } 290 EXPORT_SYMBOL(trace_print_hex_dump_seq); 291 292 int trace_raw_output_prep(struct trace_iterator *iter, 293 struct trace_event *trace_event) 294 { 295 struct trace_event_call *event; 296 struct trace_seq *s = &iter->seq; 297 struct trace_seq *p = &iter->tmp_seq; 298 struct trace_entry *entry; 299 300 event = container_of(trace_event, struct trace_event_call, event); 301 entry = iter->ent; 302 303 if (entry->type != event->event.type) { 304 WARN_ON_ONCE(1); 305 return TRACE_TYPE_UNHANDLED; 306 } 307 308 trace_seq_init(p); 309 trace_seq_printf(s, "%s: ", trace_event_name(event)); 310 311 return trace_handle_return(s); 312 } 313 EXPORT_SYMBOL(trace_raw_output_prep); 314 315 static int trace_output_raw(struct trace_iterator *iter, char *name, 316 char *fmt, va_list ap) 317 { 318 struct trace_seq *s = &iter->seq; 319 320 trace_seq_printf(s, "%s: ", name); 321 trace_seq_vprintf(s, fmt, ap); 322 323 return trace_handle_return(s); 324 } 325 326 int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...) 327 { 328 va_list ap; 329 int ret; 330 331 va_start(ap, fmt); 332 ret = trace_output_raw(iter, name, fmt, ap); 333 va_end(ap); 334 335 return ret; 336 } 337 EXPORT_SYMBOL_GPL(trace_output_call); 338 339 #ifdef CONFIG_KRETPROBES 340 static inline const char *kretprobed(const char *name) 341 { 342 static const char tramp_name[] = "kretprobe_trampoline"; 343 int size = sizeof(tramp_name); 344 345 if (strncmp(tramp_name, name, size) == 0) 346 return "[unknown/kretprobe'd]"; 347 return name; 348 } 349 #else 350 static inline const char *kretprobed(const char *name) 351 { 352 return name; 353 } 354 #endif /* CONFIG_KRETPROBES */ 355 356 static void 357 seq_print_sym(struct trace_seq *s, unsigned long address, bool offset) 358 { 359 #ifdef CONFIG_KALLSYMS 360 char str[KSYM_SYMBOL_LEN]; 361 const char *name; 362 363 if (offset) 364 sprint_symbol(str, address); 365 else 366 kallsyms_lookup(address, NULL, NULL, NULL, str); 367 name = kretprobed(str); 368 369 if (name && strlen(name)) { 370 trace_seq_puts(s, name); 371 return; 372 } 373 #endif 374 trace_seq_printf(s, "0x%08lx", address); 375 } 376 377 #ifndef CONFIG_64BIT 378 # define IP_FMT "%08lx" 379 #else 380 # define IP_FMT "%016lx" 381 #endif 382 383 static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm, 384 unsigned long ip, unsigned long sym_flags) 385 { 386 struct file *file = NULL; 387 unsigned long vmstart = 0; 388 int ret = 1; 389 390 if (s->full) 391 return 0; 392 393 if (mm) { 394 const struct vm_area_struct *vma; 395 396 down_read(&mm->mmap_sem); 397 vma = find_vma(mm, ip); 398 if (vma) { 399 file = vma->vm_file; 400 vmstart = vma->vm_start; 401 } 402 if (file) { 403 ret = trace_seq_path(s, &file->f_path); 404 if (ret) 405 trace_seq_printf(s, "[+0x%lx]", 406 ip - vmstart); 407 } 408 up_read(&mm->mmap_sem); 409 } 410 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file)) 411 trace_seq_printf(s, " <" IP_FMT ">", ip); 412 return !trace_seq_has_overflowed(s); 413 } 414 415 int 416 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags) 417 { 418 if (!ip) { 419 trace_seq_putc(s, '0'); 420 goto out; 421 } 422 423 seq_print_sym(s, ip, sym_flags & TRACE_ITER_SYM_OFFSET); 424 425 if (sym_flags & TRACE_ITER_SYM_ADDR) 426 trace_seq_printf(s, " <" IP_FMT ">", ip); 427 428 out: 429 return !trace_seq_has_overflowed(s); 430 } 431 432 /** 433 * trace_print_lat_fmt - print the irq, preempt and lockdep fields 434 * @s: trace seq struct to write to 435 * @entry: The trace entry field from the ring buffer 436 * 437 * Prints the generic fields of irqs off, in hard or softirq, preempt 438 * count. 439 */ 440 int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry) 441 { 442 char hardsoft_irq; 443 char need_resched; 444 char irqs_off; 445 int hardirq; 446 int softirq; 447 int nmi; 448 449 nmi = entry->flags & TRACE_FLAG_NMI; 450 hardirq = entry->flags & TRACE_FLAG_HARDIRQ; 451 softirq = entry->flags & TRACE_FLAG_SOFTIRQ; 452 453 irqs_off = 454 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : 455 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' : 456 '.'; 457 458 switch (entry->flags & (TRACE_FLAG_NEED_RESCHED | 459 TRACE_FLAG_PREEMPT_RESCHED)) { 460 case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED: 461 need_resched = 'N'; 462 break; 463 case TRACE_FLAG_NEED_RESCHED: 464 need_resched = 'n'; 465 break; 466 case TRACE_FLAG_PREEMPT_RESCHED: 467 need_resched = 'p'; 468 break; 469 default: 470 need_resched = '.'; 471 break; 472 } 473 474 hardsoft_irq = 475 (nmi && hardirq) ? 'Z' : 476 nmi ? 'z' : 477 (hardirq && softirq) ? 'H' : 478 hardirq ? 'h' : 479 softirq ? 's' : 480 '.' ; 481 482 trace_seq_printf(s, "%c%c%c", 483 irqs_off, need_resched, hardsoft_irq); 484 485 if (entry->preempt_count) 486 trace_seq_printf(s, "%x", entry->preempt_count); 487 else 488 trace_seq_putc(s, '.'); 489 490 return !trace_seq_has_overflowed(s); 491 } 492 493 static int 494 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu) 495 { 496 char comm[TASK_COMM_LEN]; 497 498 trace_find_cmdline(entry->pid, comm); 499 500 trace_seq_printf(s, "%8.8s-%-5d %3d", 501 comm, entry->pid, cpu); 502 503 return trace_print_lat_fmt(s, entry); 504 } 505 506 #undef MARK 507 #define MARK(v, s) {.val = v, .sym = s} 508 /* trace overhead mark */ 509 static const struct trace_mark { 510 unsigned long long val; /* unit: nsec */ 511 char sym; 512 } mark[] = { 513 MARK(1000000000ULL , '$'), /* 1 sec */ 514 MARK(100000000ULL , '@'), /* 100 msec */ 515 MARK(10000000ULL , '*'), /* 10 msec */ 516 MARK(1000000ULL , '#'), /* 1000 usecs */ 517 MARK(100000ULL , '!'), /* 100 usecs */ 518 MARK(10000ULL , '+'), /* 10 usecs */ 519 }; 520 #undef MARK 521 522 char trace_find_mark(unsigned long long d) 523 { 524 int i; 525 int size = ARRAY_SIZE(mark); 526 527 for (i = 0; i < size; i++) { 528 if (d > mark[i].val) 529 break; 530 } 531 532 return (i == size) ? ' ' : mark[i].sym; 533 } 534 535 static int 536 lat_print_timestamp(struct trace_iterator *iter, u64 next_ts) 537 { 538 struct trace_array *tr = iter->tr; 539 unsigned long verbose = tr->trace_flags & TRACE_ITER_VERBOSE; 540 unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS; 541 unsigned long long abs_ts = iter->ts - iter->array_buffer->time_start; 542 unsigned long long rel_ts = next_ts - iter->ts; 543 struct trace_seq *s = &iter->seq; 544 545 if (in_ns) { 546 abs_ts = ns2usecs(abs_ts); 547 rel_ts = ns2usecs(rel_ts); 548 } 549 550 if (verbose && in_ns) { 551 unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC); 552 unsigned long abs_msec = (unsigned long)abs_ts; 553 unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC); 554 unsigned long rel_msec = (unsigned long)rel_ts; 555 556 trace_seq_printf( 557 s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ", 558 ns2usecs(iter->ts), 559 abs_msec, abs_usec, 560 rel_msec, rel_usec); 561 562 } else if (verbose && !in_ns) { 563 trace_seq_printf( 564 s, "[%016llx] %lld (+%lld): ", 565 iter->ts, abs_ts, rel_ts); 566 567 } else if (!verbose && in_ns) { 568 trace_seq_printf( 569 s, " %4lldus%c: ", 570 abs_ts, 571 trace_find_mark(rel_ts * NSEC_PER_USEC)); 572 573 } else { /* !verbose && !in_ns */ 574 trace_seq_printf(s, " %4lld: ", abs_ts); 575 } 576 577 return !trace_seq_has_overflowed(s); 578 } 579 580 int trace_print_context(struct trace_iterator *iter) 581 { 582 struct trace_array *tr = iter->tr; 583 struct trace_seq *s = &iter->seq; 584 struct trace_entry *entry = iter->ent; 585 unsigned long long t; 586 unsigned long secs, usec_rem; 587 char comm[TASK_COMM_LEN]; 588 589 trace_find_cmdline(entry->pid, comm); 590 591 trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid); 592 593 if (tr->trace_flags & TRACE_ITER_RECORD_TGID) { 594 unsigned int tgid = trace_find_tgid(entry->pid); 595 596 if (!tgid) 597 trace_seq_printf(s, "(-----) "); 598 else 599 trace_seq_printf(s, "(%5d) ", tgid); 600 } 601 602 trace_seq_printf(s, "[%03d] ", iter->cpu); 603 604 if (tr->trace_flags & TRACE_ITER_IRQ_INFO) 605 trace_print_lat_fmt(s, entry); 606 607 if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) { 608 t = ns2usecs(iter->ts); 609 usec_rem = do_div(t, USEC_PER_SEC); 610 secs = (unsigned long)t; 611 trace_seq_printf(s, " %5lu.%06lu: ", secs, usec_rem); 612 } else 613 trace_seq_printf(s, " %12llu: ", iter->ts); 614 615 return !trace_seq_has_overflowed(s); 616 } 617 618 int trace_print_lat_context(struct trace_iterator *iter) 619 { 620 struct trace_entry *entry, *next_entry; 621 struct trace_array *tr = iter->tr; 622 struct trace_seq *s = &iter->seq; 623 unsigned long verbose = (tr->trace_flags & TRACE_ITER_VERBOSE); 624 u64 next_ts; 625 626 next_entry = trace_find_next_entry(iter, NULL, &next_ts); 627 if (!next_entry) 628 next_ts = iter->ts; 629 630 /* trace_find_next_entry() may change iter->ent */ 631 entry = iter->ent; 632 633 if (verbose) { 634 char comm[TASK_COMM_LEN]; 635 636 trace_find_cmdline(entry->pid, comm); 637 638 trace_seq_printf( 639 s, "%16s %5d %3d %d %08x %08lx ", 640 comm, entry->pid, iter->cpu, entry->flags, 641 entry->preempt_count, iter->idx); 642 } else { 643 lat_print_generic(s, entry, iter->cpu); 644 } 645 646 lat_print_timestamp(iter, next_ts); 647 648 return !trace_seq_has_overflowed(s); 649 } 650 651 /** 652 * ftrace_find_event - find a registered event 653 * @type: the type of event to look for 654 * 655 * Returns an event of type @type otherwise NULL 656 * Called with trace_event_read_lock() held. 657 */ 658 struct trace_event *ftrace_find_event(int type) 659 { 660 struct trace_event *event; 661 unsigned key; 662 663 key = type & (EVENT_HASHSIZE - 1); 664 665 hlist_for_each_entry(event, &event_hash[key], node) { 666 if (event->type == type) 667 return event; 668 } 669 670 return NULL; 671 } 672 673 static LIST_HEAD(ftrace_event_list); 674 675 static int trace_search_list(struct list_head **list) 676 { 677 struct trace_event *e; 678 int last = __TRACE_LAST_TYPE; 679 680 if (list_empty(&ftrace_event_list)) { 681 *list = &ftrace_event_list; 682 return last + 1; 683 } 684 685 /* 686 * We used up all possible max events, 687 * lets see if somebody freed one. 688 */ 689 list_for_each_entry(e, &ftrace_event_list, list) { 690 if (e->type != last + 1) 691 break; 692 last++; 693 } 694 695 /* Did we used up all 65 thousand events??? */ 696 if ((last + 1) > TRACE_EVENT_TYPE_MAX) 697 return 0; 698 699 *list = &e->list; 700 return last + 1; 701 } 702 703 void trace_event_read_lock(void) 704 { 705 down_read(&trace_event_sem); 706 } 707 708 void trace_event_read_unlock(void) 709 { 710 up_read(&trace_event_sem); 711 } 712 713 /** 714 * register_trace_event - register output for an event type 715 * @event: the event type to register 716 * 717 * Event types are stored in a hash and this hash is used to 718 * find a way to print an event. If the @event->type is set 719 * then it will use that type, otherwise it will assign a 720 * type to use. 721 * 722 * If you assign your own type, please make sure it is added 723 * to the trace_type enum in trace.h, to avoid collisions 724 * with the dynamic types. 725 * 726 * Returns the event type number or zero on error. 727 */ 728 int register_trace_event(struct trace_event *event) 729 { 730 unsigned key; 731 int ret = 0; 732 733 down_write(&trace_event_sem); 734 735 if (WARN_ON(!event)) 736 goto out; 737 738 if (WARN_ON(!event->funcs)) 739 goto out; 740 741 INIT_LIST_HEAD(&event->list); 742 743 if (!event->type) { 744 struct list_head *list = NULL; 745 746 if (next_event_type > TRACE_EVENT_TYPE_MAX) { 747 748 event->type = trace_search_list(&list); 749 if (!event->type) 750 goto out; 751 752 } else { 753 754 event->type = next_event_type++; 755 list = &ftrace_event_list; 756 } 757 758 if (WARN_ON(ftrace_find_event(event->type))) 759 goto out; 760 761 list_add_tail(&event->list, list); 762 763 } else if (event->type > __TRACE_LAST_TYPE) { 764 printk(KERN_WARNING "Need to add type to trace.h\n"); 765 WARN_ON(1); 766 goto out; 767 } else { 768 /* Is this event already used */ 769 if (ftrace_find_event(event->type)) 770 goto out; 771 } 772 773 if (event->funcs->trace == NULL) 774 event->funcs->trace = trace_nop_print; 775 if (event->funcs->raw == NULL) 776 event->funcs->raw = trace_nop_print; 777 if (event->funcs->hex == NULL) 778 event->funcs->hex = trace_nop_print; 779 if (event->funcs->binary == NULL) 780 event->funcs->binary = trace_nop_print; 781 782 key = event->type & (EVENT_HASHSIZE - 1); 783 784 hlist_add_head(&event->node, &event_hash[key]); 785 786 ret = event->type; 787 out: 788 up_write(&trace_event_sem); 789 790 return ret; 791 } 792 EXPORT_SYMBOL_GPL(register_trace_event); 793 794 /* 795 * Used by module code with the trace_event_sem held for write. 796 */ 797 int __unregister_trace_event(struct trace_event *event) 798 { 799 hlist_del(&event->node); 800 list_del(&event->list); 801 return 0; 802 } 803 804 /** 805 * unregister_trace_event - remove a no longer used event 806 * @event: the event to remove 807 */ 808 int unregister_trace_event(struct trace_event *event) 809 { 810 down_write(&trace_event_sem); 811 __unregister_trace_event(event); 812 up_write(&trace_event_sem); 813 814 return 0; 815 } 816 EXPORT_SYMBOL_GPL(unregister_trace_event); 817 818 /* 819 * Standard events 820 */ 821 822 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags, 823 struct trace_event *event) 824 { 825 trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type); 826 827 return trace_handle_return(&iter->seq); 828 } 829 830 /* TRACE_FN */ 831 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags, 832 struct trace_event *event) 833 { 834 struct ftrace_entry *field; 835 struct trace_seq *s = &iter->seq; 836 837 trace_assign_type(field, iter->ent); 838 839 seq_print_ip_sym(s, field->ip, flags); 840 841 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) { 842 trace_seq_puts(s, " <-"); 843 seq_print_ip_sym(s, field->parent_ip, flags); 844 } 845 846 trace_seq_putc(s, '\n'); 847 848 return trace_handle_return(s); 849 } 850 851 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags, 852 struct trace_event *event) 853 { 854 struct ftrace_entry *field; 855 856 trace_assign_type(field, iter->ent); 857 858 trace_seq_printf(&iter->seq, "%lx %lx\n", 859 field->ip, 860 field->parent_ip); 861 862 return trace_handle_return(&iter->seq); 863 } 864 865 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags, 866 struct trace_event *event) 867 { 868 struct ftrace_entry *field; 869 struct trace_seq *s = &iter->seq; 870 871 trace_assign_type(field, iter->ent); 872 873 SEQ_PUT_HEX_FIELD(s, field->ip); 874 SEQ_PUT_HEX_FIELD(s, field->parent_ip); 875 876 return trace_handle_return(s); 877 } 878 879 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags, 880 struct trace_event *event) 881 { 882 struct ftrace_entry *field; 883 struct trace_seq *s = &iter->seq; 884 885 trace_assign_type(field, iter->ent); 886 887 SEQ_PUT_FIELD(s, field->ip); 888 SEQ_PUT_FIELD(s, field->parent_ip); 889 890 return trace_handle_return(s); 891 } 892 893 static struct trace_event_functions trace_fn_funcs = { 894 .trace = trace_fn_trace, 895 .raw = trace_fn_raw, 896 .hex = trace_fn_hex, 897 .binary = trace_fn_bin, 898 }; 899 900 static struct trace_event trace_fn_event = { 901 .type = TRACE_FN, 902 .funcs = &trace_fn_funcs, 903 }; 904 905 /* TRACE_CTX an TRACE_WAKE */ 906 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter, 907 char *delim) 908 { 909 struct ctx_switch_entry *field; 910 char comm[TASK_COMM_LEN]; 911 int S, T; 912 913 914 trace_assign_type(field, iter->ent); 915 916 T = task_index_to_char(field->next_state); 917 S = task_index_to_char(field->prev_state); 918 trace_find_cmdline(field->next_pid, comm); 919 trace_seq_printf(&iter->seq, 920 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n", 921 field->prev_pid, 922 field->prev_prio, 923 S, delim, 924 field->next_cpu, 925 field->next_pid, 926 field->next_prio, 927 T, comm); 928 929 return trace_handle_return(&iter->seq); 930 } 931 932 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags, 933 struct trace_event *event) 934 { 935 return trace_ctxwake_print(iter, "==>"); 936 } 937 938 static enum print_line_t trace_wake_print(struct trace_iterator *iter, 939 int flags, struct trace_event *event) 940 { 941 return trace_ctxwake_print(iter, " +"); 942 } 943 944 static int trace_ctxwake_raw(struct trace_iterator *iter, char S) 945 { 946 struct ctx_switch_entry *field; 947 int T; 948 949 trace_assign_type(field, iter->ent); 950 951 if (!S) 952 S = task_index_to_char(field->prev_state); 953 T = task_index_to_char(field->next_state); 954 trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n", 955 field->prev_pid, 956 field->prev_prio, 957 S, 958 field->next_cpu, 959 field->next_pid, 960 field->next_prio, 961 T); 962 963 return trace_handle_return(&iter->seq); 964 } 965 966 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags, 967 struct trace_event *event) 968 { 969 return trace_ctxwake_raw(iter, 0); 970 } 971 972 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags, 973 struct trace_event *event) 974 { 975 return trace_ctxwake_raw(iter, '+'); 976 } 977 978 979 static int trace_ctxwake_hex(struct trace_iterator *iter, char S) 980 { 981 struct ctx_switch_entry *field; 982 struct trace_seq *s = &iter->seq; 983 int T; 984 985 trace_assign_type(field, iter->ent); 986 987 if (!S) 988 S = task_index_to_char(field->prev_state); 989 T = task_index_to_char(field->next_state); 990 991 SEQ_PUT_HEX_FIELD(s, field->prev_pid); 992 SEQ_PUT_HEX_FIELD(s, field->prev_prio); 993 SEQ_PUT_HEX_FIELD(s, S); 994 SEQ_PUT_HEX_FIELD(s, field->next_cpu); 995 SEQ_PUT_HEX_FIELD(s, field->next_pid); 996 SEQ_PUT_HEX_FIELD(s, field->next_prio); 997 SEQ_PUT_HEX_FIELD(s, T); 998 999 return trace_handle_return(s); 1000 } 1001 1002 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags, 1003 struct trace_event *event) 1004 { 1005 return trace_ctxwake_hex(iter, 0); 1006 } 1007 1008 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags, 1009 struct trace_event *event) 1010 { 1011 return trace_ctxwake_hex(iter, '+'); 1012 } 1013 1014 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter, 1015 int flags, struct trace_event *event) 1016 { 1017 struct ctx_switch_entry *field; 1018 struct trace_seq *s = &iter->seq; 1019 1020 trace_assign_type(field, iter->ent); 1021 1022 SEQ_PUT_FIELD(s, field->prev_pid); 1023 SEQ_PUT_FIELD(s, field->prev_prio); 1024 SEQ_PUT_FIELD(s, field->prev_state); 1025 SEQ_PUT_FIELD(s, field->next_cpu); 1026 SEQ_PUT_FIELD(s, field->next_pid); 1027 SEQ_PUT_FIELD(s, field->next_prio); 1028 SEQ_PUT_FIELD(s, field->next_state); 1029 1030 return trace_handle_return(s); 1031 } 1032 1033 static struct trace_event_functions trace_ctx_funcs = { 1034 .trace = trace_ctx_print, 1035 .raw = trace_ctx_raw, 1036 .hex = trace_ctx_hex, 1037 .binary = trace_ctxwake_bin, 1038 }; 1039 1040 static struct trace_event trace_ctx_event = { 1041 .type = TRACE_CTX, 1042 .funcs = &trace_ctx_funcs, 1043 }; 1044 1045 static struct trace_event_functions trace_wake_funcs = { 1046 .trace = trace_wake_print, 1047 .raw = trace_wake_raw, 1048 .hex = trace_wake_hex, 1049 .binary = trace_ctxwake_bin, 1050 }; 1051 1052 static struct trace_event trace_wake_event = { 1053 .type = TRACE_WAKE, 1054 .funcs = &trace_wake_funcs, 1055 }; 1056 1057 /* TRACE_STACK */ 1058 1059 static enum print_line_t trace_stack_print(struct trace_iterator *iter, 1060 int flags, struct trace_event *event) 1061 { 1062 struct stack_entry *field; 1063 struct trace_seq *s = &iter->seq; 1064 unsigned long *p; 1065 unsigned long *end; 1066 1067 trace_assign_type(field, iter->ent); 1068 end = (unsigned long *)((long)iter->ent + iter->ent_size); 1069 1070 trace_seq_puts(s, "<stack trace>\n"); 1071 1072 for (p = field->caller; p && p < end && *p != ULONG_MAX; p++) { 1073 1074 if (trace_seq_has_overflowed(s)) 1075 break; 1076 1077 trace_seq_puts(s, " => "); 1078 seq_print_ip_sym(s, *p, flags); 1079 trace_seq_putc(s, '\n'); 1080 } 1081 1082 return trace_handle_return(s); 1083 } 1084 1085 static struct trace_event_functions trace_stack_funcs = { 1086 .trace = trace_stack_print, 1087 }; 1088 1089 static struct trace_event trace_stack_event = { 1090 .type = TRACE_STACK, 1091 .funcs = &trace_stack_funcs, 1092 }; 1093 1094 /* TRACE_USER_STACK */ 1095 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter, 1096 int flags, struct trace_event *event) 1097 { 1098 struct trace_array *tr = iter->tr; 1099 struct userstack_entry *field; 1100 struct trace_seq *s = &iter->seq; 1101 struct mm_struct *mm = NULL; 1102 unsigned int i; 1103 1104 trace_assign_type(field, iter->ent); 1105 1106 trace_seq_puts(s, "<user stack trace>\n"); 1107 1108 if (tr->trace_flags & TRACE_ITER_SYM_USEROBJ) { 1109 struct task_struct *task; 1110 /* 1111 * we do the lookup on the thread group leader, 1112 * since individual threads might have already quit! 1113 */ 1114 rcu_read_lock(); 1115 task = find_task_by_vpid(field->tgid); 1116 if (task) 1117 mm = get_task_mm(task); 1118 rcu_read_unlock(); 1119 } 1120 1121 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { 1122 unsigned long ip = field->caller[i]; 1123 1124 if (!ip || trace_seq_has_overflowed(s)) 1125 break; 1126 1127 trace_seq_puts(s, " => "); 1128 seq_print_user_ip(s, mm, ip, flags); 1129 trace_seq_putc(s, '\n'); 1130 } 1131 1132 if (mm) 1133 mmput(mm); 1134 1135 return trace_handle_return(s); 1136 } 1137 1138 static struct trace_event_functions trace_user_stack_funcs = { 1139 .trace = trace_user_stack_print, 1140 }; 1141 1142 static struct trace_event trace_user_stack_event = { 1143 .type = TRACE_USER_STACK, 1144 .funcs = &trace_user_stack_funcs, 1145 }; 1146 1147 /* TRACE_HWLAT */ 1148 static enum print_line_t 1149 trace_hwlat_print(struct trace_iterator *iter, int flags, 1150 struct trace_event *event) 1151 { 1152 struct trace_entry *entry = iter->ent; 1153 struct trace_seq *s = &iter->seq; 1154 struct hwlat_entry *field; 1155 1156 trace_assign_type(field, entry); 1157 1158 trace_seq_printf(s, "#%-5u inner/outer(us): %4llu/%-5llu ts:%lld.%09ld count:%d", 1159 field->seqnum, 1160 field->duration, 1161 field->outer_duration, 1162 (long long)field->timestamp.tv_sec, 1163 field->timestamp.tv_nsec, field->count); 1164 1165 if (field->nmi_count) { 1166 /* 1167 * The generic sched_clock() is not NMI safe, thus 1168 * we only record the count and not the time. 1169 */ 1170 if (!IS_ENABLED(CONFIG_GENERIC_SCHED_CLOCK)) 1171 trace_seq_printf(s, " nmi-total:%llu", 1172 field->nmi_total_ts); 1173 trace_seq_printf(s, " nmi-count:%u", 1174 field->nmi_count); 1175 } 1176 1177 trace_seq_putc(s, '\n'); 1178 1179 return trace_handle_return(s); 1180 } 1181 1182 1183 static enum print_line_t 1184 trace_hwlat_raw(struct trace_iterator *iter, int flags, 1185 struct trace_event *event) 1186 { 1187 struct hwlat_entry *field; 1188 struct trace_seq *s = &iter->seq; 1189 1190 trace_assign_type(field, iter->ent); 1191 1192 trace_seq_printf(s, "%llu %lld %lld %09ld %u\n", 1193 field->duration, 1194 field->outer_duration, 1195 (long long)field->timestamp.tv_sec, 1196 field->timestamp.tv_nsec, 1197 field->seqnum); 1198 1199 return trace_handle_return(s); 1200 } 1201 1202 static struct trace_event_functions trace_hwlat_funcs = { 1203 .trace = trace_hwlat_print, 1204 .raw = trace_hwlat_raw, 1205 }; 1206 1207 static struct trace_event trace_hwlat_event = { 1208 .type = TRACE_HWLAT, 1209 .funcs = &trace_hwlat_funcs, 1210 }; 1211 1212 /* TRACE_BPUTS */ 1213 static enum print_line_t 1214 trace_bputs_print(struct trace_iterator *iter, int flags, 1215 struct trace_event *event) 1216 { 1217 struct trace_entry *entry = iter->ent; 1218 struct trace_seq *s = &iter->seq; 1219 struct bputs_entry *field; 1220 1221 trace_assign_type(field, entry); 1222 1223 seq_print_ip_sym(s, field->ip, flags); 1224 trace_seq_puts(s, ": "); 1225 trace_seq_puts(s, field->str); 1226 1227 return trace_handle_return(s); 1228 } 1229 1230 1231 static enum print_line_t 1232 trace_bputs_raw(struct trace_iterator *iter, int flags, 1233 struct trace_event *event) 1234 { 1235 struct bputs_entry *field; 1236 struct trace_seq *s = &iter->seq; 1237 1238 trace_assign_type(field, iter->ent); 1239 1240 trace_seq_printf(s, ": %lx : ", field->ip); 1241 trace_seq_puts(s, field->str); 1242 1243 return trace_handle_return(s); 1244 } 1245 1246 static struct trace_event_functions trace_bputs_funcs = { 1247 .trace = trace_bputs_print, 1248 .raw = trace_bputs_raw, 1249 }; 1250 1251 static struct trace_event trace_bputs_event = { 1252 .type = TRACE_BPUTS, 1253 .funcs = &trace_bputs_funcs, 1254 }; 1255 1256 /* TRACE_BPRINT */ 1257 static enum print_line_t 1258 trace_bprint_print(struct trace_iterator *iter, int flags, 1259 struct trace_event *event) 1260 { 1261 struct trace_entry *entry = iter->ent; 1262 struct trace_seq *s = &iter->seq; 1263 struct bprint_entry *field; 1264 1265 trace_assign_type(field, entry); 1266 1267 seq_print_ip_sym(s, field->ip, flags); 1268 trace_seq_puts(s, ": "); 1269 trace_seq_bprintf(s, field->fmt, field->buf); 1270 1271 return trace_handle_return(s); 1272 } 1273 1274 1275 static enum print_line_t 1276 trace_bprint_raw(struct trace_iterator *iter, int flags, 1277 struct trace_event *event) 1278 { 1279 struct bprint_entry *field; 1280 struct trace_seq *s = &iter->seq; 1281 1282 trace_assign_type(field, iter->ent); 1283 1284 trace_seq_printf(s, ": %lx : ", field->ip); 1285 trace_seq_bprintf(s, field->fmt, field->buf); 1286 1287 return trace_handle_return(s); 1288 } 1289 1290 static struct trace_event_functions trace_bprint_funcs = { 1291 .trace = trace_bprint_print, 1292 .raw = trace_bprint_raw, 1293 }; 1294 1295 static struct trace_event trace_bprint_event = { 1296 .type = TRACE_BPRINT, 1297 .funcs = &trace_bprint_funcs, 1298 }; 1299 1300 /* TRACE_PRINT */ 1301 static enum print_line_t trace_print_print(struct trace_iterator *iter, 1302 int flags, struct trace_event *event) 1303 { 1304 struct print_entry *field; 1305 struct trace_seq *s = &iter->seq; 1306 1307 trace_assign_type(field, iter->ent); 1308 1309 seq_print_ip_sym(s, field->ip, flags); 1310 trace_seq_printf(s, ": %s", field->buf); 1311 1312 return trace_handle_return(s); 1313 } 1314 1315 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags, 1316 struct trace_event *event) 1317 { 1318 struct print_entry *field; 1319 1320 trace_assign_type(field, iter->ent); 1321 1322 trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf); 1323 1324 return trace_handle_return(&iter->seq); 1325 } 1326 1327 static struct trace_event_functions trace_print_funcs = { 1328 .trace = trace_print_print, 1329 .raw = trace_print_raw, 1330 }; 1331 1332 static struct trace_event trace_print_event = { 1333 .type = TRACE_PRINT, 1334 .funcs = &trace_print_funcs, 1335 }; 1336 1337 static enum print_line_t trace_raw_data(struct trace_iterator *iter, int flags, 1338 struct trace_event *event) 1339 { 1340 struct raw_data_entry *field; 1341 int i; 1342 1343 trace_assign_type(field, iter->ent); 1344 1345 trace_seq_printf(&iter->seq, "# %x buf:", field->id); 1346 1347 for (i = 0; i < iter->ent_size - offsetof(struct raw_data_entry, buf); i++) 1348 trace_seq_printf(&iter->seq, " %02x", 1349 (unsigned char)field->buf[i]); 1350 1351 trace_seq_putc(&iter->seq, '\n'); 1352 1353 return trace_handle_return(&iter->seq); 1354 } 1355 1356 static struct trace_event_functions trace_raw_data_funcs = { 1357 .trace = trace_raw_data, 1358 .raw = trace_raw_data, 1359 }; 1360 1361 static struct trace_event trace_raw_data_event = { 1362 .type = TRACE_RAW_DATA, 1363 .funcs = &trace_raw_data_funcs, 1364 }; 1365 1366 1367 static struct trace_event *events[] __initdata = { 1368 &trace_fn_event, 1369 &trace_ctx_event, 1370 &trace_wake_event, 1371 &trace_stack_event, 1372 &trace_user_stack_event, 1373 &trace_bputs_event, 1374 &trace_bprint_event, 1375 &trace_print_event, 1376 &trace_hwlat_event, 1377 &trace_raw_data_event, 1378 NULL 1379 }; 1380 1381 __init static int init_events(void) 1382 { 1383 struct trace_event *event; 1384 int i, ret; 1385 1386 for (i = 0; events[i]; i++) { 1387 event = events[i]; 1388 1389 ret = register_trace_event(event); 1390 if (!ret) { 1391 printk(KERN_WARNING "event %d failed to register\n", 1392 event->type); 1393 WARN_ON_ONCE(1); 1394 } 1395 } 1396 1397 return 0; 1398 } 1399 early_initcall(init_events); 1400