1 /* 2 * trace_output.c 3 * 4 * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com> 5 * 6 */ 7 8 #include <linux/module.h> 9 #include <linux/mutex.h> 10 #include <linux/ftrace.h> 11 12 #include "trace_output.h" 13 14 /* must be a power of 2 */ 15 #define EVENT_HASHSIZE 128 16 17 DECLARE_RWSEM(trace_event_mutex); 18 19 static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly; 20 21 static int next_event_type = __TRACE_LAST_TYPE + 1; 22 23 int trace_print_seq(struct seq_file *m, struct trace_seq *s) 24 { 25 int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len; 26 int ret; 27 28 ret = seq_write(m, s->buffer, len); 29 30 /* 31 * Only reset this buffer if we successfully wrote to the 32 * seq_file buffer. 33 */ 34 if (!ret) 35 trace_seq_init(s); 36 37 return ret; 38 } 39 40 enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter) 41 { 42 struct trace_seq *s = &iter->seq; 43 struct trace_entry *entry = iter->ent; 44 struct bprint_entry *field; 45 int ret; 46 47 trace_assign_type(field, entry); 48 49 ret = trace_seq_bprintf(s, field->fmt, field->buf); 50 if (!ret) 51 return TRACE_TYPE_PARTIAL_LINE; 52 53 return TRACE_TYPE_HANDLED; 54 } 55 56 enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter) 57 { 58 struct trace_seq *s = &iter->seq; 59 struct trace_entry *entry = iter->ent; 60 struct print_entry *field; 61 int ret; 62 63 trace_assign_type(field, entry); 64 65 ret = trace_seq_printf(s, "%s", field->buf); 66 if (!ret) 67 return TRACE_TYPE_PARTIAL_LINE; 68 69 return TRACE_TYPE_HANDLED; 70 } 71 72 /** 73 * trace_seq_printf - sequence printing of trace information 74 * @s: trace sequence descriptor 75 * @fmt: printf format string 76 * 77 * It returns 0 if the trace oversizes the buffer's free 78 * space, 1 otherwise. 79 * 80 * The tracer may use either sequence operations or its own 81 * copy to user routines. To simplify formating of a trace 82 * trace_seq_printf is used to store strings into a special 83 * buffer (@s). Then the output may be either used by 84 * the sequencer or pulled into another buffer. 85 */ 86 int 87 trace_seq_printf(struct trace_seq *s, const char *fmt, ...) 88 { 89 int len = (PAGE_SIZE - 1) - s->len; 90 va_list ap; 91 int ret; 92 93 if (s->full || !len) 94 return 0; 95 96 va_start(ap, fmt); 97 ret = vsnprintf(s->buffer + s->len, len, fmt, ap); 98 va_end(ap); 99 100 /* If we can't write it all, don't bother writing anything */ 101 if (ret >= len) { 102 s->full = 1; 103 return 0; 104 } 105 106 s->len += ret; 107 108 return 1; 109 } 110 EXPORT_SYMBOL_GPL(trace_seq_printf); 111 112 /** 113 * trace_seq_vprintf - sequence printing of trace information 114 * @s: trace sequence descriptor 115 * @fmt: printf format string 116 * 117 * The tracer may use either sequence operations or its own 118 * copy to user routines. To simplify formating of a trace 119 * trace_seq_printf is used to store strings into a special 120 * buffer (@s). Then the output may be either used by 121 * the sequencer or pulled into another buffer. 122 */ 123 int 124 trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args) 125 { 126 int len = (PAGE_SIZE - 1) - s->len; 127 int ret; 128 129 if (s->full || !len) 130 return 0; 131 132 ret = vsnprintf(s->buffer + s->len, len, fmt, args); 133 134 /* If we can't write it all, don't bother writing anything */ 135 if (ret >= len) { 136 s->full = 1; 137 return 0; 138 } 139 140 s->len += ret; 141 142 return len; 143 } 144 EXPORT_SYMBOL_GPL(trace_seq_vprintf); 145 146 int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary) 147 { 148 int len = (PAGE_SIZE - 1) - s->len; 149 int ret; 150 151 if (s->full || !len) 152 return 0; 153 154 ret = bstr_printf(s->buffer + s->len, len, fmt, binary); 155 156 /* If we can't write it all, don't bother writing anything */ 157 if (ret >= len) { 158 s->full = 1; 159 return 0; 160 } 161 162 s->len += ret; 163 164 return len; 165 } 166 167 /** 168 * trace_seq_puts - trace sequence printing of simple string 169 * @s: trace sequence descriptor 170 * @str: simple string to record 171 * 172 * The tracer may use either the sequence operations or its own 173 * copy to user routines. This function records a simple string 174 * into a special buffer (@s) for later retrieval by a sequencer 175 * or other mechanism. 176 */ 177 int trace_seq_puts(struct trace_seq *s, const char *str) 178 { 179 int len = strlen(str); 180 181 if (s->full) 182 return 0; 183 184 if (len > ((PAGE_SIZE - 1) - s->len)) { 185 s->full = 1; 186 return 0; 187 } 188 189 memcpy(s->buffer + s->len, str, len); 190 s->len += len; 191 192 return len; 193 } 194 195 int trace_seq_putc(struct trace_seq *s, unsigned char c) 196 { 197 if (s->full) 198 return 0; 199 200 if (s->len >= (PAGE_SIZE - 1)) { 201 s->full = 1; 202 return 0; 203 } 204 205 s->buffer[s->len++] = c; 206 207 return 1; 208 } 209 EXPORT_SYMBOL(trace_seq_putc); 210 211 int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len) 212 { 213 if (s->full) 214 return 0; 215 216 if (len > ((PAGE_SIZE - 1) - s->len)) { 217 s->full = 1; 218 return 0; 219 } 220 221 memcpy(s->buffer + s->len, mem, len); 222 s->len += len; 223 224 return len; 225 } 226 227 int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, size_t len) 228 { 229 unsigned char hex[HEX_CHARS]; 230 const unsigned char *data = mem; 231 int i, j; 232 233 if (s->full) 234 return 0; 235 236 #ifdef __BIG_ENDIAN 237 for (i = 0, j = 0; i < len; i++) { 238 #else 239 for (i = len-1, j = 0; i >= 0; i--) { 240 #endif 241 hex[j++] = hex_asc_hi(data[i]); 242 hex[j++] = hex_asc_lo(data[i]); 243 } 244 hex[j++] = ' '; 245 246 return trace_seq_putmem(s, hex, j); 247 } 248 249 void *trace_seq_reserve(struct trace_seq *s, size_t len) 250 { 251 void *ret; 252 253 if (s->full) 254 return NULL; 255 256 if (len > ((PAGE_SIZE - 1) - s->len)) { 257 s->full = 1; 258 return NULL; 259 } 260 261 ret = s->buffer + s->len; 262 s->len += len; 263 264 return ret; 265 } 266 267 int trace_seq_path(struct trace_seq *s, struct path *path) 268 { 269 unsigned char *p; 270 271 if (s->full) 272 return 0; 273 274 if (s->len >= (PAGE_SIZE - 1)) { 275 s->full = 1; 276 return 0; 277 } 278 279 p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len); 280 if (!IS_ERR(p)) { 281 p = mangle_path(s->buffer + s->len, p, "\n"); 282 if (p) { 283 s->len = p - s->buffer; 284 return 1; 285 } 286 } else { 287 s->buffer[s->len++] = '?'; 288 return 1; 289 } 290 291 s->full = 1; 292 return 0; 293 } 294 295 const char * 296 ftrace_print_flags_seq(struct trace_seq *p, const char *delim, 297 unsigned long flags, 298 const struct trace_print_flags *flag_array) 299 { 300 unsigned long mask; 301 const char *str; 302 const char *ret = p->buffer + p->len; 303 int i; 304 305 for (i = 0; flag_array[i].name && flags; i++) { 306 307 mask = flag_array[i].mask; 308 if ((flags & mask) != mask) 309 continue; 310 311 str = flag_array[i].name; 312 flags &= ~mask; 313 if (p->len && delim) 314 trace_seq_puts(p, delim); 315 trace_seq_puts(p, str); 316 } 317 318 /* check for left over flags */ 319 if (flags) { 320 if (p->len && delim) 321 trace_seq_puts(p, delim); 322 trace_seq_printf(p, "0x%lx", flags); 323 } 324 325 trace_seq_putc(p, 0); 326 327 return ret; 328 } 329 EXPORT_SYMBOL(ftrace_print_flags_seq); 330 331 const char * 332 ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val, 333 const struct trace_print_flags *symbol_array) 334 { 335 int i; 336 const char *ret = p->buffer + p->len; 337 338 for (i = 0; symbol_array[i].name; i++) { 339 340 if (val != symbol_array[i].mask) 341 continue; 342 343 trace_seq_puts(p, symbol_array[i].name); 344 break; 345 } 346 347 if (!p->len) 348 trace_seq_printf(p, "0x%lx", val); 349 350 trace_seq_putc(p, 0); 351 352 return ret; 353 } 354 EXPORT_SYMBOL(ftrace_print_symbols_seq); 355 356 #if BITS_PER_LONG == 32 357 const char * 358 ftrace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val, 359 const struct trace_print_flags_u64 *symbol_array) 360 { 361 int i; 362 const char *ret = p->buffer + p->len; 363 364 for (i = 0; symbol_array[i].name; i++) { 365 366 if (val != symbol_array[i].mask) 367 continue; 368 369 trace_seq_puts(p, symbol_array[i].name); 370 break; 371 } 372 373 if (!p->len) 374 trace_seq_printf(p, "0x%llx", val); 375 376 trace_seq_putc(p, 0); 377 378 return ret; 379 } 380 EXPORT_SYMBOL(ftrace_print_symbols_seq_u64); 381 #endif 382 383 const char * 384 ftrace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len) 385 { 386 int i; 387 const char *ret = p->buffer + p->len; 388 389 for (i = 0; i < buf_len; i++) 390 trace_seq_printf(p, "%s%2.2x", i == 0 ? "" : " ", buf[i]); 391 392 trace_seq_putc(p, 0); 393 394 return ret; 395 } 396 EXPORT_SYMBOL(ftrace_print_hex_seq); 397 398 #ifdef CONFIG_KRETPROBES 399 static inline const char *kretprobed(const char *name) 400 { 401 static const char tramp_name[] = "kretprobe_trampoline"; 402 int size = sizeof(tramp_name); 403 404 if (strncmp(tramp_name, name, size) == 0) 405 return "[unknown/kretprobe'd]"; 406 return name; 407 } 408 #else 409 static inline const char *kretprobed(const char *name) 410 { 411 return name; 412 } 413 #endif /* CONFIG_KRETPROBES */ 414 415 static int 416 seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address) 417 { 418 #ifdef CONFIG_KALLSYMS 419 char str[KSYM_SYMBOL_LEN]; 420 const char *name; 421 422 kallsyms_lookup(address, NULL, NULL, NULL, str); 423 424 name = kretprobed(str); 425 426 return trace_seq_printf(s, fmt, name); 427 #endif 428 return 1; 429 } 430 431 static int 432 seq_print_sym_offset(struct trace_seq *s, const char *fmt, 433 unsigned long address) 434 { 435 #ifdef CONFIG_KALLSYMS 436 char str[KSYM_SYMBOL_LEN]; 437 const char *name; 438 439 sprint_symbol(str, address); 440 name = kretprobed(str); 441 442 return trace_seq_printf(s, fmt, name); 443 #endif 444 return 1; 445 } 446 447 #ifndef CONFIG_64BIT 448 # define IP_FMT "%08lx" 449 #else 450 # define IP_FMT "%016lx" 451 #endif 452 453 int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm, 454 unsigned long ip, unsigned long sym_flags) 455 { 456 struct file *file = NULL; 457 unsigned long vmstart = 0; 458 int ret = 1; 459 460 if (s->full) 461 return 0; 462 463 if (mm) { 464 const struct vm_area_struct *vma; 465 466 down_read(&mm->mmap_sem); 467 vma = find_vma(mm, ip); 468 if (vma) { 469 file = vma->vm_file; 470 vmstart = vma->vm_start; 471 } 472 if (file) { 473 ret = trace_seq_path(s, &file->f_path); 474 if (ret) 475 ret = trace_seq_printf(s, "[+0x%lx]", 476 ip - vmstart); 477 } 478 up_read(&mm->mmap_sem); 479 } 480 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file)) 481 ret = trace_seq_printf(s, " <" IP_FMT ">", ip); 482 return ret; 483 } 484 485 int 486 seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s, 487 unsigned long sym_flags) 488 { 489 struct mm_struct *mm = NULL; 490 int ret = 1; 491 unsigned int i; 492 493 if (trace_flags & TRACE_ITER_SYM_USEROBJ) { 494 struct task_struct *task; 495 /* 496 * we do the lookup on the thread group leader, 497 * since individual threads might have already quit! 498 */ 499 rcu_read_lock(); 500 task = find_task_by_vpid(entry->tgid); 501 if (task) 502 mm = get_task_mm(task); 503 rcu_read_unlock(); 504 } 505 506 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { 507 unsigned long ip = entry->caller[i]; 508 509 if (ip == ULONG_MAX || !ret) 510 break; 511 if (ret) 512 ret = trace_seq_puts(s, " => "); 513 if (!ip) { 514 if (ret) 515 ret = trace_seq_puts(s, "??"); 516 if (ret) 517 ret = trace_seq_puts(s, "\n"); 518 continue; 519 } 520 if (!ret) 521 break; 522 if (ret) 523 ret = seq_print_user_ip(s, mm, ip, sym_flags); 524 ret = trace_seq_puts(s, "\n"); 525 } 526 527 if (mm) 528 mmput(mm); 529 return ret; 530 } 531 532 int 533 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags) 534 { 535 int ret; 536 537 if (!ip) 538 return trace_seq_printf(s, "0"); 539 540 if (sym_flags & TRACE_ITER_SYM_OFFSET) 541 ret = seq_print_sym_offset(s, "%s", ip); 542 else 543 ret = seq_print_sym_short(s, "%s", ip); 544 545 if (!ret) 546 return 0; 547 548 if (sym_flags & TRACE_ITER_SYM_ADDR) 549 ret = trace_seq_printf(s, " <" IP_FMT ">", ip); 550 return ret; 551 } 552 553 /** 554 * trace_print_lat_fmt - print the irq, preempt and lockdep fields 555 * @s: trace seq struct to write to 556 * @entry: The trace entry field from the ring buffer 557 * 558 * Prints the generic fields of irqs off, in hard or softirq, preempt 559 * count. 560 */ 561 int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry) 562 { 563 char hardsoft_irq; 564 char need_resched; 565 char irqs_off; 566 int hardirq; 567 int softirq; 568 int ret; 569 570 hardirq = entry->flags & TRACE_FLAG_HARDIRQ; 571 softirq = entry->flags & TRACE_FLAG_SOFTIRQ; 572 573 irqs_off = 574 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : 575 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' : 576 '.'; 577 need_resched = 578 (entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.'; 579 hardsoft_irq = 580 (hardirq && softirq) ? 'H' : 581 hardirq ? 'h' : 582 softirq ? 's' : 583 '.'; 584 585 if (!trace_seq_printf(s, "%c%c%c", 586 irqs_off, need_resched, hardsoft_irq)) 587 return 0; 588 589 if (entry->preempt_count) 590 ret = trace_seq_printf(s, "%x", entry->preempt_count); 591 else 592 ret = trace_seq_putc(s, '.'); 593 594 return ret; 595 } 596 597 static int 598 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu) 599 { 600 char comm[TASK_COMM_LEN]; 601 602 trace_find_cmdline(entry->pid, comm); 603 604 if (!trace_seq_printf(s, "%8.8s-%-5d %3d", 605 comm, entry->pid, cpu)) 606 return 0; 607 608 return trace_print_lat_fmt(s, entry); 609 } 610 611 static unsigned long preempt_mark_thresh = 100; 612 613 static int 614 lat_print_timestamp(struct trace_seq *s, u64 abs_usecs, 615 unsigned long rel_usecs) 616 { 617 return trace_seq_printf(s, " %4lldus%c: ", abs_usecs, 618 rel_usecs > preempt_mark_thresh ? '!' : 619 rel_usecs > 1 ? '+' : ' '); 620 } 621 622 int trace_print_context(struct trace_iterator *iter) 623 { 624 struct trace_seq *s = &iter->seq; 625 struct trace_entry *entry = iter->ent; 626 unsigned long long t = ns2usecs(iter->ts); 627 unsigned long usec_rem = do_div(t, USEC_PER_SEC); 628 unsigned long secs = (unsigned long)t; 629 char comm[TASK_COMM_LEN]; 630 631 trace_find_cmdline(entry->pid, comm); 632 633 return trace_seq_printf(s, "%16s-%-5d [%03d] %5lu.%06lu: ", 634 comm, entry->pid, iter->cpu, secs, usec_rem); 635 } 636 637 int trace_print_lat_context(struct trace_iterator *iter) 638 { 639 u64 next_ts; 640 int ret; 641 struct trace_seq *s = &iter->seq; 642 struct trace_entry *entry = iter->ent, 643 *next_entry = trace_find_next_entry(iter, NULL, 644 &next_ts); 645 unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE); 646 unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start); 647 unsigned long rel_usecs; 648 649 if (!next_entry) 650 next_ts = iter->ts; 651 rel_usecs = ns2usecs(next_ts - iter->ts); 652 653 if (verbose) { 654 char comm[TASK_COMM_LEN]; 655 656 trace_find_cmdline(entry->pid, comm); 657 658 ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08llx]" 659 " %ld.%03ldms (+%ld.%03ldms): ", comm, 660 entry->pid, iter->cpu, entry->flags, 661 entry->preempt_count, iter->idx, 662 ns2usecs(iter->ts), 663 abs_usecs / USEC_PER_MSEC, 664 abs_usecs % USEC_PER_MSEC, 665 rel_usecs / USEC_PER_MSEC, 666 rel_usecs % USEC_PER_MSEC); 667 } else { 668 ret = lat_print_generic(s, entry, iter->cpu); 669 if (ret) 670 ret = lat_print_timestamp(s, abs_usecs, rel_usecs); 671 } 672 673 return ret; 674 } 675 676 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR; 677 678 static int task_state_char(unsigned long state) 679 { 680 int bit = state ? __ffs(state) + 1 : 0; 681 682 return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?'; 683 } 684 685 /** 686 * ftrace_find_event - find a registered event 687 * @type: the type of event to look for 688 * 689 * Returns an event of type @type otherwise NULL 690 * Called with trace_event_read_lock() held. 691 */ 692 struct trace_event *ftrace_find_event(int type) 693 { 694 struct trace_event *event; 695 struct hlist_node *n; 696 unsigned key; 697 698 key = type & (EVENT_HASHSIZE - 1); 699 700 hlist_for_each_entry(event, n, &event_hash[key], node) { 701 if (event->type == type) 702 return event; 703 } 704 705 return NULL; 706 } 707 708 static LIST_HEAD(ftrace_event_list); 709 710 static int trace_search_list(struct list_head **list) 711 { 712 struct trace_event *e; 713 int last = __TRACE_LAST_TYPE; 714 715 if (list_empty(&ftrace_event_list)) { 716 *list = &ftrace_event_list; 717 return last + 1; 718 } 719 720 /* 721 * We used up all possible max events, 722 * lets see if somebody freed one. 723 */ 724 list_for_each_entry(e, &ftrace_event_list, list) { 725 if (e->type != last + 1) 726 break; 727 last++; 728 } 729 730 /* Did we used up all 65 thousand events??? */ 731 if ((last + 1) > FTRACE_MAX_EVENT) 732 return 0; 733 734 *list = &e->list; 735 return last + 1; 736 } 737 738 void trace_event_read_lock(void) 739 { 740 down_read(&trace_event_mutex); 741 } 742 743 void trace_event_read_unlock(void) 744 { 745 up_read(&trace_event_mutex); 746 } 747 748 /** 749 * register_ftrace_event - register output for an event type 750 * @event: the event type to register 751 * 752 * Event types are stored in a hash and this hash is used to 753 * find a way to print an event. If the @event->type is set 754 * then it will use that type, otherwise it will assign a 755 * type to use. 756 * 757 * If you assign your own type, please make sure it is added 758 * to the trace_type enum in trace.h, to avoid collisions 759 * with the dynamic types. 760 * 761 * Returns the event type number or zero on error. 762 */ 763 int register_ftrace_event(struct trace_event *event) 764 { 765 unsigned key; 766 int ret = 0; 767 768 down_write(&trace_event_mutex); 769 770 if (WARN_ON(!event)) 771 goto out; 772 773 if (WARN_ON(!event->funcs)) 774 goto out; 775 776 INIT_LIST_HEAD(&event->list); 777 778 if (!event->type) { 779 struct list_head *list = NULL; 780 781 if (next_event_type > FTRACE_MAX_EVENT) { 782 783 event->type = trace_search_list(&list); 784 if (!event->type) 785 goto out; 786 787 } else { 788 789 event->type = next_event_type++; 790 list = &ftrace_event_list; 791 } 792 793 if (WARN_ON(ftrace_find_event(event->type))) 794 goto out; 795 796 list_add_tail(&event->list, list); 797 798 } else if (event->type > __TRACE_LAST_TYPE) { 799 printk(KERN_WARNING "Need to add type to trace.h\n"); 800 WARN_ON(1); 801 goto out; 802 } else { 803 /* Is this event already used */ 804 if (ftrace_find_event(event->type)) 805 goto out; 806 } 807 808 if (event->funcs->trace == NULL) 809 event->funcs->trace = trace_nop_print; 810 if (event->funcs->raw == NULL) 811 event->funcs->raw = trace_nop_print; 812 if (event->funcs->hex == NULL) 813 event->funcs->hex = trace_nop_print; 814 if (event->funcs->binary == NULL) 815 event->funcs->binary = trace_nop_print; 816 817 key = event->type & (EVENT_HASHSIZE - 1); 818 819 hlist_add_head(&event->node, &event_hash[key]); 820 821 ret = event->type; 822 out: 823 up_write(&trace_event_mutex); 824 825 return ret; 826 } 827 EXPORT_SYMBOL_GPL(register_ftrace_event); 828 829 /* 830 * Used by module code with the trace_event_mutex held for write. 831 */ 832 int __unregister_ftrace_event(struct trace_event *event) 833 { 834 hlist_del(&event->node); 835 list_del(&event->list); 836 return 0; 837 } 838 839 /** 840 * unregister_ftrace_event - remove a no longer used event 841 * @event: the event to remove 842 */ 843 int unregister_ftrace_event(struct trace_event *event) 844 { 845 down_write(&trace_event_mutex); 846 __unregister_ftrace_event(event); 847 up_write(&trace_event_mutex); 848 849 return 0; 850 } 851 EXPORT_SYMBOL_GPL(unregister_ftrace_event); 852 853 /* 854 * Standard events 855 */ 856 857 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags, 858 struct trace_event *event) 859 { 860 if (!trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type)) 861 return TRACE_TYPE_PARTIAL_LINE; 862 863 return TRACE_TYPE_HANDLED; 864 } 865 866 /* TRACE_FN */ 867 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags, 868 struct trace_event *event) 869 { 870 struct ftrace_entry *field; 871 struct trace_seq *s = &iter->seq; 872 873 trace_assign_type(field, iter->ent); 874 875 if (!seq_print_ip_sym(s, field->ip, flags)) 876 goto partial; 877 878 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) { 879 if (!trace_seq_printf(s, " <-")) 880 goto partial; 881 if (!seq_print_ip_sym(s, 882 field->parent_ip, 883 flags)) 884 goto partial; 885 } 886 if (!trace_seq_printf(s, "\n")) 887 goto partial; 888 889 return TRACE_TYPE_HANDLED; 890 891 partial: 892 return TRACE_TYPE_PARTIAL_LINE; 893 } 894 895 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags, 896 struct trace_event *event) 897 { 898 struct ftrace_entry *field; 899 900 trace_assign_type(field, iter->ent); 901 902 if (!trace_seq_printf(&iter->seq, "%lx %lx\n", 903 field->ip, 904 field->parent_ip)) 905 return TRACE_TYPE_PARTIAL_LINE; 906 907 return TRACE_TYPE_HANDLED; 908 } 909 910 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags, 911 struct trace_event *event) 912 { 913 struct ftrace_entry *field; 914 struct trace_seq *s = &iter->seq; 915 916 trace_assign_type(field, iter->ent); 917 918 SEQ_PUT_HEX_FIELD_RET(s, field->ip); 919 SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip); 920 921 return TRACE_TYPE_HANDLED; 922 } 923 924 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags, 925 struct trace_event *event) 926 { 927 struct ftrace_entry *field; 928 struct trace_seq *s = &iter->seq; 929 930 trace_assign_type(field, iter->ent); 931 932 SEQ_PUT_FIELD_RET(s, field->ip); 933 SEQ_PUT_FIELD_RET(s, field->parent_ip); 934 935 return TRACE_TYPE_HANDLED; 936 } 937 938 static struct trace_event_functions trace_fn_funcs = { 939 .trace = trace_fn_trace, 940 .raw = trace_fn_raw, 941 .hex = trace_fn_hex, 942 .binary = trace_fn_bin, 943 }; 944 945 static struct trace_event trace_fn_event = { 946 .type = TRACE_FN, 947 .funcs = &trace_fn_funcs, 948 }; 949 950 /* TRACE_CTX an TRACE_WAKE */ 951 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter, 952 char *delim) 953 { 954 struct ctx_switch_entry *field; 955 char comm[TASK_COMM_LEN]; 956 int S, T; 957 958 959 trace_assign_type(field, iter->ent); 960 961 T = task_state_char(field->next_state); 962 S = task_state_char(field->prev_state); 963 trace_find_cmdline(field->next_pid, comm); 964 if (!trace_seq_printf(&iter->seq, 965 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n", 966 field->prev_pid, 967 field->prev_prio, 968 S, delim, 969 field->next_cpu, 970 field->next_pid, 971 field->next_prio, 972 T, comm)) 973 return TRACE_TYPE_PARTIAL_LINE; 974 975 return TRACE_TYPE_HANDLED; 976 } 977 978 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags, 979 struct trace_event *event) 980 { 981 return trace_ctxwake_print(iter, "==>"); 982 } 983 984 static enum print_line_t trace_wake_print(struct trace_iterator *iter, 985 int flags, struct trace_event *event) 986 { 987 return trace_ctxwake_print(iter, " +"); 988 } 989 990 static int trace_ctxwake_raw(struct trace_iterator *iter, char S) 991 { 992 struct ctx_switch_entry *field; 993 int T; 994 995 trace_assign_type(field, iter->ent); 996 997 if (!S) 998 S = task_state_char(field->prev_state); 999 T = task_state_char(field->next_state); 1000 if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n", 1001 field->prev_pid, 1002 field->prev_prio, 1003 S, 1004 field->next_cpu, 1005 field->next_pid, 1006 field->next_prio, 1007 T)) 1008 return TRACE_TYPE_PARTIAL_LINE; 1009 1010 return TRACE_TYPE_HANDLED; 1011 } 1012 1013 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags, 1014 struct trace_event *event) 1015 { 1016 return trace_ctxwake_raw(iter, 0); 1017 } 1018 1019 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags, 1020 struct trace_event *event) 1021 { 1022 return trace_ctxwake_raw(iter, '+'); 1023 } 1024 1025 1026 static int trace_ctxwake_hex(struct trace_iterator *iter, char S) 1027 { 1028 struct ctx_switch_entry *field; 1029 struct trace_seq *s = &iter->seq; 1030 int T; 1031 1032 trace_assign_type(field, iter->ent); 1033 1034 if (!S) 1035 S = task_state_char(field->prev_state); 1036 T = task_state_char(field->next_state); 1037 1038 SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid); 1039 SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio); 1040 SEQ_PUT_HEX_FIELD_RET(s, S); 1041 SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu); 1042 SEQ_PUT_HEX_FIELD_RET(s, field->next_pid); 1043 SEQ_PUT_HEX_FIELD_RET(s, field->next_prio); 1044 SEQ_PUT_HEX_FIELD_RET(s, T); 1045 1046 return TRACE_TYPE_HANDLED; 1047 } 1048 1049 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags, 1050 struct trace_event *event) 1051 { 1052 return trace_ctxwake_hex(iter, 0); 1053 } 1054 1055 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags, 1056 struct trace_event *event) 1057 { 1058 return trace_ctxwake_hex(iter, '+'); 1059 } 1060 1061 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter, 1062 int flags, struct trace_event *event) 1063 { 1064 struct ctx_switch_entry *field; 1065 struct trace_seq *s = &iter->seq; 1066 1067 trace_assign_type(field, iter->ent); 1068 1069 SEQ_PUT_FIELD_RET(s, field->prev_pid); 1070 SEQ_PUT_FIELD_RET(s, field->prev_prio); 1071 SEQ_PUT_FIELD_RET(s, field->prev_state); 1072 SEQ_PUT_FIELD_RET(s, field->next_pid); 1073 SEQ_PUT_FIELD_RET(s, field->next_prio); 1074 SEQ_PUT_FIELD_RET(s, field->next_state); 1075 1076 return TRACE_TYPE_HANDLED; 1077 } 1078 1079 static struct trace_event_functions trace_ctx_funcs = { 1080 .trace = trace_ctx_print, 1081 .raw = trace_ctx_raw, 1082 .hex = trace_ctx_hex, 1083 .binary = trace_ctxwake_bin, 1084 }; 1085 1086 static struct trace_event trace_ctx_event = { 1087 .type = TRACE_CTX, 1088 .funcs = &trace_ctx_funcs, 1089 }; 1090 1091 static struct trace_event_functions trace_wake_funcs = { 1092 .trace = trace_wake_print, 1093 .raw = trace_wake_raw, 1094 .hex = trace_wake_hex, 1095 .binary = trace_ctxwake_bin, 1096 }; 1097 1098 static struct trace_event trace_wake_event = { 1099 .type = TRACE_WAKE, 1100 .funcs = &trace_wake_funcs, 1101 }; 1102 1103 /* TRACE_STACK */ 1104 1105 static enum print_line_t trace_stack_print(struct trace_iterator *iter, 1106 int flags, struct trace_event *event) 1107 { 1108 struct stack_entry *field; 1109 struct trace_seq *s = &iter->seq; 1110 int i; 1111 1112 trace_assign_type(field, iter->ent); 1113 1114 if (!trace_seq_puts(s, "<stack trace>\n")) 1115 goto partial; 1116 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { 1117 if (!field->caller[i] || (field->caller[i] == ULONG_MAX)) 1118 break; 1119 if (!trace_seq_puts(s, " => ")) 1120 goto partial; 1121 1122 if (!seq_print_ip_sym(s, field->caller[i], flags)) 1123 goto partial; 1124 if (!trace_seq_puts(s, "\n")) 1125 goto partial; 1126 } 1127 1128 return TRACE_TYPE_HANDLED; 1129 1130 partial: 1131 return TRACE_TYPE_PARTIAL_LINE; 1132 } 1133 1134 static struct trace_event_functions trace_stack_funcs = { 1135 .trace = trace_stack_print, 1136 }; 1137 1138 static struct trace_event trace_stack_event = { 1139 .type = TRACE_STACK, 1140 .funcs = &trace_stack_funcs, 1141 }; 1142 1143 /* TRACE_USER_STACK */ 1144 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter, 1145 int flags, struct trace_event *event) 1146 { 1147 struct userstack_entry *field; 1148 struct trace_seq *s = &iter->seq; 1149 1150 trace_assign_type(field, iter->ent); 1151 1152 if (!trace_seq_puts(s, "<user stack trace>\n")) 1153 goto partial; 1154 1155 if (!seq_print_userip_objs(field, s, flags)) 1156 goto partial; 1157 1158 return TRACE_TYPE_HANDLED; 1159 1160 partial: 1161 return TRACE_TYPE_PARTIAL_LINE; 1162 } 1163 1164 static struct trace_event_functions trace_user_stack_funcs = { 1165 .trace = trace_user_stack_print, 1166 }; 1167 1168 static struct trace_event trace_user_stack_event = { 1169 .type = TRACE_USER_STACK, 1170 .funcs = &trace_user_stack_funcs, 1171 }; 1172 1173 /* TRACE_BPRINT */ 1174 static enum print_line_t 1175 trace_bprint_print(struct trace_iterator *iter, int flags, 1176 struct trace_event *event) 1177 { 1178 struct trace_entry *entry = iter->ent; 1179 struct trace_seq *s = &iter->seq; 1180 struct bprint_entry *field; 1181 1182 trace_assign_type(field, entry); 1183 1184 if (!seq_print_ip_sym(s, field->ip, flags)) 1185 goto partial; 1186 1187 if (!trace_seq_puts(s, ": ")) 1188 goto partial; 1189 1190 if (!trace_seq_bprintf(s, field->fmt, field->buf)) 1191 goto partial; 1192 1193 return TRACE_TYPE_HANDLED; 1194 1195 partial: 1196 return TRACE_TYPE_PARTIAL_LINE; 1197 } 1198 1199 1200 static enum print_line_t 1201 trace_bprint_raw(struct trace_iterator *iter, int flags, 1202 struct trace_event *event) 1203 { 1204 struct bprint_entry *field; 1205 struct trace_seq *s = &iter->seq; 1206 1207 trace_assign_type(field, iter->ent); 1208 1209 if (!trace_seq_printf(s, ": %lx : ", field->ip)) 1210 goto partial; 1211 1212 if (!trace_seq_bprintf(s, field->fmt, field->buf)) 1213 goto partial; 1214 1215 return TRACE_TYPE_HANDLED; 1216 1217 partial: 1218 return TRACE_TYPE_PARTIAL_LINE; 1219 } 1220 1221 static struct trace_event_functions trace_bprint_funcs = { 1222 .trace = trace_bprint_print, 1223 .raw = trace_bprint_raw, 1224 }; 1225 1226 static struct trace_event trace_bprint_event = { 1227 .type = TRACE_BPRINT, 1228 .funcs = &trace_bprint_funcs, 1229 }; 1230 1231 /* TRACE_PRINT */ 1232 static enum print_line_t trace_print_print(struct trace_iterator *iter, 1233 int flags, struct trace_event *event) 1234 { 1235 struct print_entry *field; 1236 struct trace_seq *s = &iter->seq; 1237 1238 trace_assign_type(field, iter->ent); 1239 1240 if (!seq_print_ip_sym(s, field->ip, flags)) 1241 goto partial; 1242 1243 if (!trace_seq_printf(s, ": %s", field->buf)) 1244 goto partial; 1245 1246 return TRACE_TYPE_HANDLED; 1247 1248 partial: 1249 return TRACE_TYPE_PARTIAL_LINE; 1250 } 1251 1252 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags, 1253 struct trace_event *event) 1254 { 1255 struct print_entry *field; 1256 1257 trace_assign_type(field, iter->ent); 1258 1259 if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf)) 1260 goto partial; 1261 1262 return TRACE_TYPE_HANDLED; 1263 1264 partial: 1265 return TRACE_TYPE_PARTIAL_LINE; 1266 } 1267 1268 static struct trace_event_functions trace_print_funcs = { 1269 .trace = trace_print_print, 1270 .raw = trace_print_raw, 1271 }; 1272 1273 static struct trace_event trace_print_event = { 1274 .type = TRACE_PRINT, 1275 .funcs = &trace_print_funcs, 1276 }; 1277 1278 1279 static struct trace_event *events[] __initdata = { 1280 &trace_fn_event, 1281 &trace_ctx_event, 1282 &trace_wake_event, 1283 &trace_stack_event, 1284 &trace_user_stack_event, 1285 &trace_bprint_event, 1286 &trace_print_event, 1287 NULL 1288 }; 1289 1290 __init static int init_events(void) 1291 { 1292 struct trace_event *event; 1293 int i, ret; 1294 1295 for (i = 0; events[i]; i++) { 1296 event = events[i]; 1297 1298 ret = register_ftrace_event(event); 1299 if (!ret) { 1300 printk(KERN_WARNING "event %d failed to register\n", 1301 event->type); 1302 WARN_ON_ONCE(1); 1303 } 1304 } 1305 1306 return 0; 1307 } 1308 device_initcall(init_events); 1309