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; 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 void trace_event_printf(struct trace_iterator *iter, const char *fmt, ...) 316 { 317 va_list ap; 318 319 va_start(ap, fmt); 320 trace_seq_vprintf(&iter->seq, trace_event_format(iter, fmt), ap); 321 va_end(ap); 322 } 323 EXPORT_SYMBOL(trace_event_printf); 324 325 static int trace_output_raw(struct trace_iterator *iter, char *name, 326 char *fmt, va_list ap) 327 { 328 struct trace_seq *s = &iter->seq; 329 330 trace_seq_printf(s, "%s: ", name); 331 trace_seq_vprintf(s, trace_event_format(iter, fmt), ap); 332 333 return trace_handle_return(s); 334 } 335 336 int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...) 337 { 338 va_list ap; 339 int ret; 340 341 va_start(ap, fmt); 342 ret = trace_output_raw(iter, name, fmt, ap); 343 va_end(ap); 344 345 return ret; 346 } 347 EXPORT_SYMBOL_GPL(trace_output_call); 348 349 #ifdef CONFIG_KRETPROBES 350 static inline const char *kretprobed(const char *name) 351 { 352 static const char tramp_name[] = "kretprobe_trampoline"; 353 int size = sizeof(tramp_name); 354 355 if (strncmp(tramp_name, name, size) == 0) 356 return "[unknown/kretprobe'd]"; 357 return name; 358 } 359 #else 360 static inline const char *kretprobed(const char *name) 361 { 362 return name; 363 } 364 #endif /* CONFIG_KRETPROBES */ 365 366 void 367 trace_seq_print_sym(struct trace_seq *s, unsigned long address, bool offset) 368 { 369 #ifdef CONFIG_KALLSYMS 370 char str[KSYM_SYMBOL_LEN]; 371 const char *name; 372 373 if (offset) 374 sprint_symbol(str, address); 375 else 376 kallsyms_lookup(address, NULL, NULL, NULL, str); 377 name = kretprobed(str); 378 379 if (name && strlen(name)) { 380 trace_seq_puts(s, name); 381 return; 382 } 383 #endif 384 trace_seq_printf(s, "0x%08lx", address); 385 } 386 387 #ifndef CONFIG_64BIT 388 # define IP_FMT "%08lx" 389 #else 390 # define IP_FMT "%016lx" 391 #endif 392 393 static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm, 394 unsigned long ip, unsigned long sym_flags) 395 { 396 struct file *file = NULL; 397 unsigned long vmstart = 0; 398 int ret = 1; 399 400 if (s->full) 401 return 0; 402 403 if (mm) { 404 const struct vm_area_struct *vma; 405 406 mmap_read_lock(mm); 407 vma = find_vma(mm, ip); 408 if (vma) { 409 file = vma->vm_file; 410 vmstart = vma->vm_start; 411 } 412 if (file) { 413 ret = trace_seq_path(s, &file->f_path); 414 if (ret) 415 trace_seq_printf(s, "[+0x%lx]", 416 ip - vmstart); 417 } 418 mmap_read_unlock(mm); 419 } 420 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file)) 421 trace_seq_printf(s, " <" IP_FMT ">", ip); 422 return !trace_seq_has_overflowed(s); 423 } 424 425 int 426 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags) 427 { 428 if (!ip) { 429 trace_seq_putc(s, '0'); 430 goto out; 431 } 432 433 trace_seq_print_sym(s, ip, sym_flags & TRACE_ITER_SYM_OFFSET); 434 435 if (sym_flags & TRACE_ITER_SYM_ADDR) 436 trace_seq_printf(s, " <" IP_FMT ">", ip); 437 438 out: 439 return !trace_seq_has_overflowed(s); 440 } 441 442 /** 443 * trace_print_lat_fmt - print the irq, preempt and lockdep fields 444 * @s: trace seq struct to write to 445 * @entry: The trace entry field from the ring buffer 446 * 447 * Prints the generic fields of irqs off, in hard or softirq, preempt 448 * count. 449 */ 450 int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry) 451 { 452 char hardsoft_irq; 453 char need_resched; 454 char irqs_off; 455 int hardirq; 456 int softirq; 457 int nmi; 458 459 nmi = entry->flags & TRACE_FLAG_NMI; 460 hardirq = entry->flags & TRACE_FLAG_HARDIRQ; 461 softirq = entry->flags & TRACE_FLAG_SOFTIRQ; 462 463 irqs_off = 464 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : 465 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' : 466 '.'; 467 468 switch (entry->flags & (TRACE_FLAG_NEED_RESCHED | 469 TRACE_FLAG_PREEMPT_RESCHED)) { 470 case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED: 471 need_resched = 'N'; 472 break; 473 case TRACE_FLAG_NEED_RESCHED: 474 need_resched = 'n'; 475 break; 476 case TRACE_FLAG_PREEMPT_RESCHED: 477 need_resched = 'p'; 478 break; 479 default: 480 need_resched = '.'; 481 break; 482 } 483 484 hardsoft_irq = 485 (nmi && hardirq) ? 'Z' : 486 nmi ? 'z' : 487 (hardirq && softirq) ? 'H' : 488 hardirq ? 'h' : 489 softirq ? 's' : 490 '.' ; 491 492 trace_seq_printf(s, "%c%c%c", 493 irqs_off, need_resched, hardsoft_irq); 494 495 if (entry->preempt_count) 496 trace_seq_printf(s, "%x", entry->preempt_count); 497 else 498 trace_seq_putc(s, '.'); 499 500 return !trace_seq_has_overflowed(s); 501 } 502 503 static int 504 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu) 505 { 506 char comm[TASK_COMM_LEN]; 507 508 trace_find_cmdline(entry->pid, comm); 509 510 trace_seq_printf(s, "%8.8s-%-7d %3d", 511 comm, entry->pid, cpu); 512 513 return trace_print_lat_fmt(s, entry); 514 } 515 516 #undef MARK 517 #define MARK(v, s) {.val = v, .sym = s} 518 /* trace overhead mark */ 519 static const struct trace_mark { 520 unsigned long long val; /* unit: nsec */ 521 char sym; 522 } mark[] = { 523 MARK(1000000000ULL , '$'), /* 1 sec */ 524 MARK(100000000ULL , '@'), /* 100 msec */ 525 MARK(10000000ULL , '*'), /* 10 msec */ 526 MARK(1000000ULL , '#'), /* 1000 usecs */ 527 MARK(100000ULL , '!'), /* 100 usecs */ 528 MARK(10000ULL , '+'), /* 10 usecs */ 529 }; 530 #undef MARK 531 532 char trace_find_mark(unsigned long long d) 533 { 534 int i; 535 int size = ARRAY_SIZE(mark); 536 537 for (i = 0; i < size; i++) { 538 if (d > mark[i].val) 539 break; 540 } 541 542 return (i == size) ? ' ' : mark[i].sym; 543 } 544 545 static int 546 lat_print_timestamp(struct trace_iterator *iter, u64 next_ts) 547 { 548 struct trace_array *tr = iter->tr; 549 unsigned long verbose = tr->trace_flags & TRACE_ITER_VERBOSE; 550 unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS; 551 unsigned long long abs_ts = iter->ts - iter->array_buffer->time_start; 552 unsigned long long rel_ts = next_ts - iter->ts; 553 struct trace_seq *s = &iter->seq; 554 555 if (in_ns) { 556 abs_ts = ns2usecs(abs_ts); 557 rel_ts = ns2usecs(rel_ts); 558 } 559 560 if (verbose && in_ns) { 561 unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC); 562 unsigned long abs_msec = (unsigned long)abs_ts; 563 unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC); 564 unsigned long rel_msec = (unsigned long)rel_ts; 565 566 trace_seq_printf( 567 s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ", 568 ns2usecs(iter->ts), 569 abs_msec, abs_usec, 570 rel_msec, rel_usec); 571 572 } else if (verbose && !in_ns) { 573 trace_seq_printf( 574 s, "[%016llx] %lld (+%lld): ", 575 iter->ts, abs_ts, rel_ts); 576 577 } else if (!verbose && in_ns) { 578 trace_seq_printf( 579 s, " %4lldus%c: ", 580 abs_ts, 581 trace_find_mark(rel_ts * NSEC_PER_USEC)); 582 583 } else { /* !verbose && !in_ns */ 584 trace_seq_printf(s, " %4lld: ", abs_ts); 585 } 586 587 return !trace_seq_has_overflowed(s); 588 } 589 590 int trace_print_context(struct trace_iterator *iter) 591 { 592 struct trace_array *tr = iter->tr; 593 struct trace_seq *s = &iter->seq; 594 struct trace_entry *entry = iter->ent; 595 unsigned long long t; 596 unsigned long secs, usec_rem; 597 char comm[TASK_COMM_LEN]; 598 599 trace_find_cmdline(entry->pid, comm); 600 601 trace_seq_printf(s, "%16s-%-7d ", comm, entry->pid); 602 603 if (tr->trace_flags & TRACE_ITER_RECORD_TGID) { 604 unsigned int tgid = trace_find_tgid(entry->pid); 605 606 if (!tgid) 607 trace_seq_printf(s, "(-------) "); 608 else 609 trace_seq_printf(s, "(%7d) ", tgid); 610 } 611 612 trace_seq_printf(s, "[%03d] ", iter->cpu); 613 614 if (tr->trace_flags & TRACE_ITER_IRQ_INFO) 615 trace_print_lat_fmt(s, entry); 616 617 if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) { 618 t = ns2usecs(iter->ts); 619 usec_rem = do_div(t, USEC_PER_SEC); 620 secs = (unsigned long)t; 621 trace_seq_printf(s, " %5lu.%06lu: ", secs, usec_rem); 622 } else 623 trace_seq_printf(s, " %12llu: ", iter->ts); 624 625 return !trace_seq_has_overflowed(s); 626 } 627 628 int trace_print_lat_context(struct trace_iterator *iter) 629 { 630 struct trace_entry *entry, *next_entry; 631 struct trace_array *tr = iter->tr; 632 struct trace_seq *s = &iter->seq; 633 unsigned long verbose = (tr->trace_flags & TRACE_ITER_VERBOSE); 634 u64 next_ts; 635 636 next_entry = trace_find_next_entry(iter, NULL, &next_ts); 637 if (!next_entry) 638 next_ts = iter->ts; 639 640 /* trace_find_next_entry() may change iter->ent */ 641 entry = iter->ent; 642 643 if (verbose) { 644 char comm[TASK_COMM_LEN]; 645 646 trace_find_cmdline(entry->pid, comm); 647 648 trace_seq_printf( 649 s, "%16s %7d %3d %d %08x %08lx ", 650 comm, entry->pid, iter->cpu, entry->flags, 651 entry->preempt_count, iter->idx); 652 } else { 653 lat_print_generic(s, entry, iter->cpu); 654 } 655 656 lat_print_timestamp(iter, next_ts); 657 658 return !trace_seq_has_overflowed(s); 659 } 660 661 /** 662 * ftrace_find_event - find a registered event 663 * @type: the type of event to look for 664 * 665 * Returns an event of type @type otherwise NULL 666 * Called with trace_event_read_lock() held. 667 */ 668 struct trace_event *ftrace_find_event(int type) 669 { 670 struct trace_event *event; 671 unsigned key; 672 673 key = type & (EVENT_HASHSIZE - 1); 674 675 hlist_for_each_entry(event, &event_hash[key], node) { 676 if (event->type == type) 677 return event; 678 } 679 680 return NULL; 681 } 682 683 static LIST_HEAD(ftrace_event_list); 684 685 static int trace_search_list(struct list_head **list) 686 { 687 struct trace_event *e; 688 int next = __TRACE_LAST_TYPE; 689 690 if (list_empty(&ftrace_event_list)) { 691 *list = &ftrace_event_list; 692 return next; 693 } 694 695 /* 696 * We used up all possible max events, 697 * lets see if somebody freed one. 698 */ 699 list_for_each_entry(e, &ftrace_event_list, list) { 700 if (e->type != next) 701 break; 702 next++; 703 } 704 705 /* Did we used up all 65 thousand events??? */ 706 if (next > TRACE_EVENT_TYPE_MAX) 707 return 0; 708 709 *list = &e->list; 710 return next; 711 } 712 713 void trace_event_read_lock(void) 714 { 715 down_read(&trace_event_sem); 716 } 717 718 void trace_event_read_unlock(void) 719 { 720 up_read(&trace_event_sem); 721 } 722 723 /** 724 * register_trace_event - register output for an event type 725 * @event: the event type to register 726 * 727 * Event types are stored in a hash and this hash is used to 728 * find a way to print an event. If the @event->type is set 729 * then it will use that type, otherwise it will assign a 730 * type to use. 731 * 732 * If you assign your own type, please make sure it is added 733 * to the trace_type enum in trace.h, to avoid collisions 734 * with the dynamic types. 735 * 736 * Returns the event type number or zero on error. 737 */ 738 int register_trace_event(struct trace_event *event) 739 { 740 unsigned key; 741 int ret = 0; 742 743 down_write(&trace_event_sem); 744 745 if (WARN_ON(!event)) 746 goto out; 747 748 if (WARN_ON(!event->funcs)) 749 goto out; 750 751 INIT_LIST_HEAD(&event->list); 752 753 if (!event->type) { 754 struct list_head *list = NULL; 755 756 if (next_event_type > TRACE_EVENT_TYPE_MAX) { 757 758 event->type = trace_search_list(&list); 759 if (!event->type) 760 goto out; 761 762 } else { 763 764 event->type = next_event_type++; 765 list = &ftrace_event_list; 766 } 767 768 if (WARN_ON(ftrace_find_event(event->type))) 769 goto out; 770 771 list_add_tail(&event->list, list); 772 773 } else if (event->type > __TRACE_LAST_TYPE) { 774 printk(KERN_WARNING "Need to add type to trace.h\n"); 775 WARN_ON(1); 776 goto out; 777 } else { 778 /* Is this event already used */ 779 if (ftrace_find_event(event->type)) 780 goto out; 781 } 782 783 if (event->funcs->trace == NULL) 784 event->funcs->trace = trace_nop_print; 785 if (event->funcs->raw == NULL) 786 event->funcs->raw = trace_nop_print; 787 if (event->funcs->hex == NULL) 788 event->funcs->hex = trace_nop_print; 789 if (event->funcs->binary == NULL) 790 event->funcs->binary = trace_nop_print; 791 792 key = event->type & (EVENT_HASHSIZE - 1); 793 794 hlist_add_head(&event->node, &event_hash[key]); 795 796 ret = event->type; 797 out: 798 up_write(&trace_event_sem); 799 800 return ret; 801 } 802 EXPORT_SYMBOL_GPL(register_trace_event); 803 804 /* 805 * Used by module code with the trace_event_sem held for write. 806 */ 807 int __unregister_trace_event(struct trace_event *event) 808 { 809 hlist_del(&event->node); 810 list_del(&event->list); 811 return 0; 812 } 813 814 /** 815 * unregister_trace_event - remove a no longer used event 816 * @event: the event to remove 817 */ 818 int unregister_trace_event(struct trace_event *event) 819 { 820 down_write(&trace_event_sem); 821 __unregister_trace_event(event); 822 up_write(&trace_event_sem); 823 824 return 0; 825 } 826 EXPORT_SYMBOL_GPL(unregister_trace_event); 827 828 /* 829 * Standard events 830 */ 831 832 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags, 833 struct trace_event *event) 834 { 835 trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type); 836 837 return trace_handle_return(&iter->seq); 838 } 839 840 /* TRACE_FN */ 841 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags, 842 struct trace_event *event) 843 { 844 struct ftrace_entry *field; 845 struct trace_seq *s = &iter->seq; 846 847 trace_assign_type(field, iter->ent); 848 849 seq_print_ip_sym(s, field->ip, flags); 850 851 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) { 852 trace_seq_puts(s, " <-"); 853 seq_print_ip_sym(s, field->parent_ip, flags); 854 } 855 856 trace_seq_putc(s, '\n'); 857 858 return trace_handle_return(s); 859 } 860 861 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags, 862 struct trace_event *event) 863 { 864 struct ftrace_entry *field; 865 866 trace_assign_type(field, iter->ent); 867 868 trace_seq_printf(&iter->seq, "%lx %lx\n", 869 field->ip, 870 field->parent_ip); 871 872 return trace_handle_return(&iter->seq); 873 } 874 875 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags, 876 struct trace_event *event) 877 { 878 struct ftrace_entry *field; 879 struct trace_seq *s = &iter->seq; 880 881 trace_assign_type(field, iter->ent); 882 883 SEQ_PUT_HEX_FIELD(s, field->ip); 884 SEQ_PUT_HEX_FIELD(s, field->parent_ip); 885 886 return trace_handle_return(s); 887 } 888 889 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags, 890 struct trace_event *event) 891 { 892 struct ftrace_entry *field; 893 struct trace_seq *s = &iter->seq; 894 895 trace_assign_type(field, iter->ent); 896 897 SEQ_PUT_FIELD(s, field->ip); 898 SEQ_PUT_FIELD(s, field->parent_ip); 899 900 return trace_handle_return(s); 901 } 902 903 static struct trace_event_functions trace_fn_funcs = { 904 .trace = trace_fn_trace, 905 .raw = trace_fn_raw, 906 .hex = trace_fn_hex, 907 .binary = trace_fn_bin, 908 }; 909 910 static struct trace_event trace_fn_event = { 911 .type = TRACE_FN, 912 .funcs = &trace_fn_funcs, 913 }; 914 915 /* TRACE_CTX an TRACE_WAKE */ 916 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter, 917 char *delim) 918 { 919 struct ctx_switch_entry *field; 920 char comm[TASK_COMM_LEN]; 921 int S, T; 922 923 924 trace_assign_type(field, iter->ent); 925 926 T = task_index_to_char(field->next_state); 927 S = task_index_to_char(field->prev_state); 928 trace_find_cmdline(field->next_pid, comm); 929 trace_seq_printf(&iter->seq, 930 " %7d:%3d:%c %s [%03d] %7d:%3d:%c %s\n", 931 field->prev_pid, 932 field->prev_prio, 933 S, delim, 934 field->next_cpu, 935 field->next_pid, 936 field->next_prio, 937 T, comm); 938 939 return trace_handle_return(&iter->seq); 940 } 941 942 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags, 943 struct trace_event *event) 944 { 945 return trace_ctxwake_print(iter, "==>"); 946 } 947 948 static enum print_line_t trace_wake_print(struct trace_iterator *iter, 949 int flags, struct trace_event *event) 950 { 951 return trace_ctxwake_print(iter, " +"); 952 } 953 954 static int trace_ctxwake_raw(struct trace_iterator *iter, char S) 955 { 956 struct ctx_switch_entry *field; 957 int T; 958 959 trace_assign_type(field, iter->ent); 960 961 if (!S) 962 S = task_index_to_char(field->prev_state); 963 T = task_index_to_char(field->next_state); 964 trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n", 965 field->prev_pid, 966 field->prev_prio, 967 S, 968 field->next_cpu, 969 field->next_pid, 970 field->next_prio, 971 T); 972 973 return trace_handle_return(&iter->seq); 974 } 975 976 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags, 977 struct trace_event *event) 978 { 979 return trace_ctxwake_raw(iter, 0); 980 } 981 982 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags, 983 struct trace_event *event) 984 { 985 return trace_ctxwake_raw(iter, '+'); 986 } 987 988 989 static int trace_ctxwake_hex(struct trace_iterator *iter, char S) 990 { 991 struct ctx_switch_entry *field; 992 struct trace_seq *s = &iter->seq; 993 int T; 994 995 trace_assign_type(field, iter->ent); 996 997 if (!S) 998 S = task_index_to_char(field->prev_state); 999 T = task_index_to_char(field->next_state); 1000 1001 SEQ_PUT_HEX_FIELD(s, field->prev_pid); 1002 SEQ_PUT_HEX_FIELD(s, field->prev_prio); 1003 SEQ_PUT_HEX_FIELD(s, S); 1004 SEQ_PUT_HEX_FIELD(s, field->next_cpu); 1005 SEQ_PUT_HEX_FIELD(s, field->next_pid); 1006 SEQ_PUT_HEX_FIELD(s, field->next_prio); 1007 SEQ_PUT_HEX_FIELD(s, T); 1008 1009 return trace_handle_return(s); 1010 } 1011 1012 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags, 1013 struct trace_event *event) 1014 { 1015 return trace_ctxwake_hex(iter, 0); 1016 } 1017 1018 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags, 1019 struct trace_event *event) 1020 { 1021 return trace_ctxwake_hex(iter, '+'); 1022 } 1023 1024 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter, 1025 int flags, struct trace_event *event) 1026 { 1027 struct ctx_switch_entry *field; 1028 struct trace_seq *s = &iter->seq; 1029 1030 trace_assign_type(field, iter->ent); 1031 1032 SEQ_PUT_FIELD(s, field->prev_pid); 1033 SEQ_PUT_FIELD(s, field->prev_prio); 1034 SEQ_PUT_FIELD(s, field->prev_state); 1035 SEQ_PUT_FIELD(s, field->next_cpu); 1036 SEQ_PUT_FIELD(s, field->next_pid); 1037 SEQ_PUT_FIELD(s, field->next_prio); 1038 SEQ_PUT_FIELD(s, field->next_state); 1039 1040 return trace_handle_return(s); 1041 } 1042 1043 static struct trace_event_functions trace_ctx_funcs = { 1044 .trace = trace_ctx_print, 1045 .raw = trace_ctx_raw, 1046 .hex = trace_ctx_hex, 1047 .binary = trace_ctxwake_bin, 1048 }; 1049 1050 static struct trace_event trace_ctx_event = { 1051 .type = TRACE_CTX, 1052 .funcs = &trace_ctx_funcs, 1053 }; 1054 1055 static struct trace_event_functions trace_wake_funcs = { 1056 .trace = trace_wake_print, 1057 .raw = trace_wake_raw, 1058 .hex = trace_wake_hex, 1059 .binary = trace_ctxwake_bin, 1060 }; 1061 1062 static struct trace_event trace_wake_event = { 1063 .type = TRACE_WAKE, 1064 .funcs = &trace_wake_funcs, 1065 }; 1066 1067 /* TRACE_STACK */ 1068 1069 static enum print_line_t trace_stack_print(struct trace_iterator *iter, 1070 int flags, struct trace_event *event) 1071 { 1072 struct stack_entry *field; 1073 struct trace_seq *s = &iter->seq; 1074 unsigned long *p; 1075 unsigned long *end; 1076 1077 trace_assign_type(field, iter->ent); 1078 end = (unsigned long *)((long)iter->ent + iter->ent_size); 1079 1080 trace_seq_puts(s, "<stack trace>\n"); 1081 1082 for (p = field->caller; p && p < end && *p != ULONG_MAX; p++) { 1083 1084 if (trace_seq_has_overflowed(s)) 1085 break; 1086 1087 trace_seq_puts(s, " => "); 1088 seq_print_ip_sym(s, *p, flags); 1089 trace_seq_putc(s, '\n'); 1090 } 1091 1092 return trace_handle_return(s); 1093 } 1094 1095 static struct trace_event_functions trace_stack_funcs = { 1096 .trace = trace_stack_print, 1097 }; 1098 1099 static struct trace_event trace_stack_event = { 1100 .type = TRACE_STACK, 1101 .funcs = &trace_stack_funcs, 1102 }; 1103 1104 /* TRACE_USER_STACK */ 1105 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter, 1106 int flags, struct trace_event *event) 1107 { 1108 struct trace_array *tr = iter->tr; 1109 struct userstack_entry *field; 1110 struct trace_seq *s = &iter->seq; 1111 struct mm_struct *mm = NULL; 1112 unsigned int i; 1113 1114 trace_assign_type(field, iter->ent); 1115 1116 trace_seq_puts(s, "<user stack trace>\n"); 1117 1118 if (tr->trace_flags & TRACE_ITER_SYM_USEROBJ) { 1119 struct task_struct *task; 1120 /* 1121 * we do the lookup on the thread group leader, 1122 * since individual threads might have already quit! 1123 */ 1124 rcu_read_lock(); 1125 task = find_task_by_vpid(field->tgid); 1126 if (task) 1127 mm = get_task_mm(task); 1128 rcu_read_unlock(); 1129 } 1130 1131 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { 1132 unsigned long ip = field->caller[i]; 1133 1134 if (!ip || trace_seq_has_overflowed(s)) 1135 break; 1136 1137 trace_seq_puts(s, " => "); 1138 seq_print_user_ip(s, mm, ip, flags); 1139 trace_seq_putc(s, '\n'); 1140 } 1141 1142 if (mm) 1143 mmput(mm); 1144 1145 return trace_handle_return(s); 1146 } 1147 1148 static struct trace_event_functions trace_user_stack_funcs = { 1149 .trace = trace_user_stack_print, 1150 }; 1151 1152 static struct trace_event trace_user_stack_event = { 1153 .type = TRACE_USER_STACK, 1154 .funcs = &trace_user_stack_funcs, 1155 }; 1156 1157 /* TRACE_HWLAT */ 1158 static enum print_line_t 1159 trace_hwlat_print(struct trace_iterator *iter, int flags, 1160 struct trace_event *event) 1161 { 1162 struct trace_entry *entry = iter->ent; 1163 struct trace_seq *s = &iter->seq; 1164 struct hwlat_entry *field; 1165 1166 trace_assign_type(field, entry); 1167 1168 trace_seq_printf(s, "#%-5u inner/outer(us): %4llu/%-5llu ts:%lld.%09ld count:%d", 1169 field->seqnum, 1170 field->duration, 1171 field->outer_duration, 1172 (long long)field->timestamp.tv_sec, 1173 field->timestamp.tv_nsec, field->count); 1174 1175 if (field->nmi_count) { 1176 /* 1177 * The generic sched_clock() is not NMI safe, thus 1178 * we only record the count and not the time. 1179 */ 1180 if (!IS_ENABLED(CONFIG_GENERIC_SCHED_CLOCK)) 1181 trace_seq_printf(s, " nmi-total:%llu", 1182 field->nmi_total_ts); 1183 trace_seq_printf(s, " nmi-count:%u", 1184 field->nmi_count); 1185 } 1186 1187 trace_seq_putc(s, '\n'); 1188 1189 return trace_handle_return(s); 1190 } 1191 1192 1193 static enum print_line_t 1194 trace_hwlat_raw(struct trace_iterator *iter, int flags, 1195 struct trace_event *event) 1196 { 1197 struct hwlat_entry *field; 1198 struct trace_seq *s = &iter->seq; 1199 1200 trace_assign_type(field, iter->ent); 1201 1202 trace_seq_printf(s, "%llu %lld %lld %09ld %u\n", 1203 field->duration, 1204 field->outer_duration, 1205 (long long)field->timestamp.tv_sec, 1206 field->timestamp.tv_nsec, 1207 field->seqnum); 1208 1209 return trace_handle_return(s); 1210 } 1211 1212 static struct trace_event_functions trace_hwlat_funcs = { 1213 .trace = trace_hwlat_print, 1214 .raw = trace_hwlat_raw, 1215 }; 1216 1217 static struct trace_event trace_hwlat_event = { 1218 .type = TRACE_HWLAT, 1219 .funcs = &trace_hwlat_funcs, 1220 }; 1221 1222 /* TRACE_BPUTS */ 1223 static enum print_line_t 1224 trace_bputs_print(struct trace_iterator *iter, int flags, 1225 struct trace_event *event) 1226 { 1227 struct trace_entry *entry = iter->ent; 1228 struct trace_seq *s = &iter->seq; 1229 struct bputs_entry *field; 1230 1231 trace_assign_type(field, entry); 1232 1233 seq_print_ip_sym(s, field->ip, flags); 1234 trace_seq_puts(s, ": "); 1235 trace_seq_puts(s, field->str); 1236 1237 return trace_handle_return(s); 1238 } 1239 1240 1241 static enum print_line_t 1242 trace_bputs_raw(struct trace_iterator *iter, int flags, 1243 struct trace_event *event) 1244 { 1245 struct bputs_entry *field; 1246 struct trace_seq *s = &iter->seq; 1247 1248 trace_assign_type(field, iter->ent); 1249 1250 trace_seq_printf(s, ": %lx : ", field->ip); 1251 trace_seq_puts(s, field->str); 1252 1253 return trace_handle_return(s); 1254 } 1255 1256 static struct trace_event_functions trace_bputs_funcs = { 1257 .trace = trace_bputs_print, 1258 .raw = trace_bputs_raw, 1259 }; 1260 1261 static struct trace_event trace_bputs_event = { 1262 .type = TRACE_BPUTS, 1263 .funcs = &trace_bputs_funcs, 1264 }; 1265 1266 /* TRACE_BPRINT */ 1267 static enum print_line_t 1268 trace_bprint_print(struct trace_iterator *iter, int flags, 1269 struct trace_event *event) 1270 { 1271 struct trace_entry *entry = iter->ent; 1272 struct trace_seq *s = &iter->seq; 1273 struct bprint_entry *field; 1274 1275 trace_assign_type(field, entry); 1276 1277 seq_print_ip_sym(s, field->ip, flags); 1278 trace_seq_puts(s, ": "); 1279 trace_seq_bprintf(s, field->fmt, field->buf); 1280 1281 return trace_handle_return(s); 1282 } 1283 1284 1285 static enum print_line_t 1286 trace_bprint_raw(struct trace_iterator *iter, int flags, 1287 struct trace_event *event) 1288 { 1289 struct bprint_entry *field; 1290 struct trace_seq *s = &iter->seq; 1291 1292 trace_assign_type(field, iter->ent); 1293 1294 trace_seq_printf(s, ": %lx : ", field->ip); 1295 trace_seq_bprintf(s, field->fmt, field->buf); 1296 1297 return trace_handle_return(s); 1298 } 1299 1300 static struct trace_event_functions trace_bprint_funcs = { 1301 .trace = trace_bprint_print, 1302 .raw = trace_bprint_raw, 1303 }; 1304 1305 static struct trace_event trace_bprint_event = { 1306 .type = TRACE_BPRINT, 1307 .funcs = &trace_bprint_funcs, 1308 }; 1309 1310 /* TRACE_PRINT */ 1311 static enum print_line_t trace_print_print(struct trace_iterator *iter, 1312 int flags, struct trace_event *event) 1313 { 1314 struct print_entry *field; 1315 struct trace_seq *s = &iter->seq; 1316 1317 trace_assign_type(field, iter->ent); 1318 1319 seq_print_ip_sym(s, field->ip, flags); 1320 trace_seq_printf(s, ": %s", field->buf); 1321 1322 return trace_handle_return(s); 1323 } 1324 1325 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags, 1326 struct trace_event *event) 1327 { 1328 struct print_entry *field; 1329 1330 trace_assign_type(field, iter->ent); 1331 1332 trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf); 1333 1334 return trace_handle_return(&iter->seq); 1335 } 1336 1337 static struct trace_event_functions trace_print_funcs = { 1338 .trace = trace_print_print, 1339 .raw = trace_print_raw, 1340 }; 1341 1342 static struct trace_event trace_print_event = { 1343 .type = TRACE_PRINT, 1344 .funcs = &trace_print_funcs, 1345 }; 1346 1347 static enum print_line_t trace_raw_data(struct trace_iterator *iter, int flags, 1348 struct trace_event *event) 1349 { 1350 struct raw_data_entry *field; 1351 int i; 1352 1353 trace_assign_type(field, iter->ent); 1354 1355 trace_seq_printf(&iter->seq, "# %x buf:", field->id); 1356 1357 for (i = 0; i < iter->ent_size - offsetof(struct raw_data_entry, buf); i++) 1358 trace_seq_printf(&iter->seq, " %02x", 1359 (unsigned char)field->buf[i]); 1360 1361 trace_seq_putc(&iter->seq, '\n'); 1362 1363 return trace_handle_return(&iter->seq); 1364 } 1365 1366 static struct trace_event_functions trace_raw_data_funcs = { 1367 .trace = trace_raw_data, 1368 .raw = trace_raw_data, 1369 }; 1370 1371 static struct trace_event trace_raw_data_event = { 1372 .type = TRACE_RAW_DATA, 1373 .funcs = &trace_raw_data_funcs, 1374 }; 1375 1376 1377 static struct trace_event *events[] __initdata = { 1378 &trace_fn_event, 1379 &trace_ctx_event, 1380 &trace_wake_event, 1381 &trace_stack_event, 1382 &trace_user_stack_event, 1383 &trace_bputs_event, 1384 &trace_bprint_event, 1385 &trace_print_event, 1386 &trace_hwlat_event, 1387 &trace_raw_data_event, 1388 NULL 1389 }; 1390 1391 __init static int init_events(void) 1392 { 1393 struct trace_event *event; 1394 int i, ret; 1395 1396 for (i = 0; events[i]; i++) { 1397 event = events[i]; 1398 1399 ret = register_trace_event(event); 1400 if (!ret) { 1401 printk(KERN_WARNING "event %d failed to register\n", 1402 event->type); 1403 WARN_ON_ONCE(1); 1404 } 1405 } 1406 1407 return 0; 1408 } 1409 early_initcall(init_events); 1410