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 DEFINE_PER_CPU(struct trace_seq, ftrace_event_seq); 20 EXPORT_PER_CPU_SYMBOL(ftrace_event_seq); 21 22 static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly; 23 24 static int next_event_type = __TRACE_LAST_TYPE + 1; 25 26 void trace_print_seq(struct seq_file *m, struct trace_seq *s) 27 { 28 int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len; 29 30 seq_write(m, s->buffer, len); 31 32 trace_seq_init(s); 33 } 34 35 enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter) 36 { 37 struct trace_seq *s = &iter->seq; 38 struct trace_entry *entry = iter->ent; 39 struct bprint_entry *field; 40 int ret; 41 42 trace_assign_type(field, entry); 43 44 ret = trace_seq_bprintf(s, field->fmt, field->buf); 45 if (!ret) 46 return TRACE_TYPE_PARTIAL_LINE; 47 48 return TRACE_TYPE_HANDLED; 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 int ret; 57 58 trace_assign_type(field, entry); 59 60 ret = trace_seq_printf(s, "%s", field->buf); 61 if (!ret) 62 return TRACE_TYPE_PARTIAL_LINE; 63 64 return TRACE_TYPE_HANDLED; 65 } 66 67 /** 68 * trace_seq_printf - sequence printing of trace information 69 * @s: trace sequence descriptor 70 * @fmt: printf format string 71 * 72 * The tracer may use either sequence operations or its own 73 * copy to user routines. To simplify formating of a trace 74 * trace_seq_printf is used to store strings into a special 75 * buffer (@s). Then the output may be either used by 76 * the sequencer or pulled into another buffer. 77 */ 78 int 79 trace_seq_printf(struct trace_seq *s, const char *fmt, ...) 80 { 81 int len = (PAGE_SIZE - 1) - s->len; 82 va_list ap; 83 int ret; 84 85 if (!len) 86 return 0; 87 88 va_start(ap, fmt); 89 ret = vsnprintf(s->buffer + s->len, len, fmt, ap); 90 va_end(ap); 91 92 /* If we can't write it all, don't bother writing anything */ 93 if (ret >= len) 94 return 0; 95 96 s->len += ret; 97 98 return len; 99 } 100 EXPORT_SYMBOL_GPL(trace_seq_printf); 101 102 /** 103 * trace_seq_vprintf - sequence printing of trace information 104 * @s: trace sequence descriptor 105 * @fmt: printf format string 106 * 107 * The tracer may use either sequence operations or its own 108 * copy to user routines. To simplify formating of a trace 109 * trace_seq_printf is used to store strings into a special 110 * buffer (@s). Then the output may be either used by 111 * the sequencer or pulled into another buffer. 112 */ 113 int 114 trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args) 115 { 116 int len = (PAGE_SIZE - 1) - s->len; 117 int ret; 118 119 if (!len) 120 return 0; 121 122 ret = vsnprintf(s->buffer + s->len, len, fmt, args); 123 124 /* If we can't write it all, don't bother writing anything */ 125 if (ret >= len) 126 return 0; 127 128 s->len += ret; 129 130 return len; 131 } 132 EXPORT_SYMBOL_GPL(trace_seq_vprintf); 133 134 int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary) 135 { 136 int len = (PAGE_SIZE - 1) - s->len; 137 int ret; 138 139 if (!len) 140 return 0; 141 142 ret = bstr_printf(s->buffer + s->len, len, fmt, binary); 143 144 /* If we can't write it all, don't bother writing anything */ 145 if (ret >= len) 146 return 0; 147 148 s->len += ret; 149 150 return len; 151 } 152 153 /** 154 * trace_seq_puts - trace sequence printing of simple string 155 * @s: trace sequence descriptor 156 * @str: simple string to record 157 * 158 * The tracer may use either the sequence operations or its own 159 * copy to user routines. This function records a simple string 160 * into a special buffer (@s) for later retrieval by a sequencer 161 * or other mechanism. 162 */ 163 int trace_seq_puts(struct trace_seq *s, const char *str) 164 { 165 int len = strlen(str); 166 167 if (len > ((PAGE_SIZE - 1) - s->len)) 168 return 0; 169 170 memcpy(s->buffer + s->len, str, len); 171 s->len += len; 172 173 return len; 174 } 175 176 int trace_seq_putc(struct trace_seq *s, unsigned char c) 177 { 178 if (s->len >= (PAGE_SIZE - 1)) 179 return 0; 180 181 s->buffer[s->len++] = c; 182 183 return 1; 184 } 185 186 int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len) 187 { 188 if (len > ((PAGE_SIZE - 1) - s->len)) 189 return 0; 190 191 memcpy(s->buffer + s->len, mem, len); 192 s->len += len; 193 194 return len; 195 } 196 197 int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, size_t len) 198 { 199 unsigned char hex[HEX_CHARS]; 200 const unsigned char *data = mem; 201 int i, j; 202 203 #ifdef __BIG_ENDIAN 204 for (i = 0, j = 0; i < len; i++) { 205 #else 206 for (i = len-1, j = 0; i >= 0; i--) { 207 #endif 208 hex[j++] = hex_asc_hi(data[i]); 209 hex[j++] = hex_asc_lo(data[i]); 210 } 211 hex[j++] = ' '; 212 213 return trace_seq_putmem(s, hex, j); 214 } 215 216 void *trace_seq_reserve(struct trace_seq *s, size_t len) 217 { 218 void *ret; 219 220 if (len > ((PAGE_SIZE - 1) - s->len)) 221 return NULL; 222 223 ret = s->buffer + s->len; 224 s->len += len; 225 226 return ret; 227 } 228 229 int trace_seq_path(struct trace_seq *s, struct path *path) 230 { 231 unsigned char *p; 232 233 if (s->len >= (PAGE_SIZE - 1)) 234 return 0; 235 p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len); 236 if (!IS_ERR(p)) { 237 p = mangle_path(s->buffer + s->len, p, "\n"); 238 if (p) { 239 s->len = p - s->buffer; 240 return 1; 241 } 242 } else { 243 s->buffer[s->len++] = '?'; 244 return 1; 245 } 246 247 return 0; 248 } 249 250 const char * 251 ftrace_print_flags_seq(struct trace_seq *p, const char *delim, 252 unsigned long flags, 253 const struct trace_print_flags *flag_array) 254 { 255 unsigned long mask; 256 const char *str; 257 const char *ret = p->buffer + p->len; 258 int i; 259 260 for (i = 0; flag_array[i].name && flags; i++) { 261 262 mask = flag_array[i].mask; 263 if ((flags & mask) != mask) 264 continue; 265 266 str = flag_array[i].name; 267 flags &= ~mask; 268 if (p->len && delim) 269 trace_seq_puts(p, delim); 270 trace_seq_puts(p, str); 271 } 272 273 /* check for left over flags */ 274 if (flags) { 275 if (p->len && delim) 276 trace_seq_puts(p, delim); 277 trace_seq_printf(p, "0x%lx", flags); 278 } 279 280 trace_seq_putc(p, 0); 281 282 return ret; 283 } 284 EXPORT_SYMBOL(ftrace_print_flags_seq); 285 286 const char * 287 ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val, 288 const struct trace_print_flags *symbol_array) 289 { 290 int i; 291 const char *ret = p->buffer + p->len; 292 293 for (i = 0; symbol_array[i].name; i++) { 294 295 if (val != symbol_array[i].mask) 296 continue; 297 298 trace_seq_puts(p, symbol_array[i].name); 299 break; 300 } 301 302 if (!p->len) 303 trace_seq_printf(p, "0x%lx", val); 304 305 trace_seq_putc(p, 0); 306 307 return ret; 308 } 309 EXPORT_SYMBOL(ftrace_print_symbols_seq); 310 311 #ifdef CONFIG_KRETPROBES 312 static inline const char *kretprobed(const char *name) 313 { 314 static const char tramp_name[] = "kretprobe_trampoline"; 315 int size = sizeof(tramp_name); 316 317 if (strncmp(tramp_name, name, size) == 0) 318 return "[unknown/kretprobe'd]"; 319 return name; 320 } 321 #else 322 static inline const char *kretprobed(const char *name) 323 { 324 return name; 325 } 326 #endif /* CONFIG_KRETPROBES */ 327 328 static int 329 seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address) 330 { 331 #ifdef CONFIG_KALLSYMS 332 char str[KSYM_SYMBOL_LEN]; 333 const char *name; 334 335 kallsyms_lookup(address, NULL, NULL, NULL, str); 336 337 name = kretprobed(str); 338 339 return trace_seq_printf(s, fmt, name); 340 #endif 341 return 1; 342 } 343 344 static int 345 seq_print_sym_offset(struct trace_seq *s, const char *fmt, 346 unsigned long address) 347 { 348 #ifdef CONFIG_KALLSYMS 349 char str[KSYM_SYMBOL_LEN]; 350 const char *name; 351 352 sprint_symbol(str, address); 353 name = kretprobed(str); 354 355 return trace_seq_printf(s, fmt, name); 356 #endif 357 return 1; 358 } 359 360 #ifndef CONFIG_64BIT 361 # define IP_FMT "%08lx" 362 #else 363 # define IP_FMT "%016lx" 364 #endif 365 366 int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm, 367 unsigned long ip, unsigned long sym_flags) 368 { 369 struct file *file = NULL; 370 unsigned long vmstart = 0; 371 int ret = 1; 372 373 if (mm) { 374 const struct vm_area_struct *vma; 375 376 down_read(&mm->mmap_sem); 377 vma = find_vma(mm, ip); 378 if (vma) { 379 file = vma->vm_file; 380 vmstart = vma->vm_start; 381 } 382 if (file) { 383 ret = trace_seq_path(s, &file->f_path); 384 if (ret) 385 ret = trace_seq_printf(s, "[+0x%lx]", 386 ip - vmstart); 387 } 388 up_read(&mm->mmap_sem); 389 } 390 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file)) 391 ret = trace_seq_printf(s, " <" IP_FMT ">", ip); 392 return ret; 393 } 394 395 int 396 seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s, 397 unsigned long sym_flags) 398 { 399 struct mm_struct *mm = NULL; 400 int ret = 1; 401 unsigned int i; 402 403 if (trace_flags & TRACE_ITER_SYM_USEROBJ) { 404 struct task_struct *task; 405 /* 406 * we do the lookup on the thread group leader, 407 * since individual threads might have already quit! 408 */ 409 rcu_read_lock(); 410 task = find_task_by_vpid(entry->tgid); 411 if (task) 412 mm = get_task_mm(task); 413 rcu_read_unlock(); 414 } 415 416 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { 417 unsigned long ip = entry->caller[i]; 418 419 if (ip == ULONG_MAX || !ret) 420 break; 421 if (ret) 422 ret = trace_seq_puts(s, " => "); 423 if (!ip) { 424 if (ret) 425 ret = trace_seq_puts(s, "??"); 426 if (ret) 427 ret = trace_seq_puts(s, "\n"); 428 continue; 429 } 430 if (!ret) 431 break; 432 if (ret) 433 ret = seq_print_user_ip(s, mm, ip, sym_flags); 434 ret = trace_seq_puts(s, "\n"); 435 } 436 437 if (mm) 438 mmput(mm); 439 return ret; 440 } 441 442 int 443 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags) 444 { 445 int ret; 446 447 if (!ip) 448 return trace_seq_printf(s, "0"); 449 450 if (sym_flags & TRACE_ITER_SYM_OFFSET) 451 ret = seq_print_sym_offset(s, "%s", ip); 452 else 453 ret = seq_print_sym_short(s, "%s", ip); 454 455 if (!ret) 456 return 0; 457 458 if (sym_flags & TRACE_ITER_SYM_ADDR) 459 ret = trace_seq_printf(s, " <" IP_FMT ">", ip); 460 return ret; 461 } 462 463 /** 464 * trace_print_lat_fmt - print the irq, preempt and lockdep fields 465 * @s: trace seq struct to write to 466 * @entry: The trace entry field from the ring buffer 467 * 468 * Prints the generic fields of irqs off, in hard or softirq, preempt 469 * count and lock depth. 470 */ 471 int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry) 472 { 473 int hardirq, softirq; 474 int ret; 475 476 hardirq = entry->flags & TRACE_FLAG_HARDIRQ; 477 softirq = entry->flags & TRACE_FLAG_SOFTIRQ; 478 479 if (!trace_seq_printf(s, "%c%c%c", 480 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : 481 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 482 'X' : '.', 483 (entry->flags & TRACE_FLAG_NEED_RESCHED) ? 484 'N' : '.', 485 (hardirq && softirq) ? 'H' : 486 hardirq ? 'h' : softirq ? 's' : '.')) 487 return 0; 488 489 if (entry->lock_depth < 0) 490 ret = trace_seq_putc(s, '.'); 491 else 492 ret = trace_seq_printf(s, "%d", entry->lock_depth); 493 if (!ret) 494 return 0; 495 496 if (entry->preempt_count) 497 return trace_seq_printf(s, "%x", entry->preempt_count); 498 return trace_seq_putc(s, '.'); 499 } 500 501 static int 502 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu) 503 { 504 char comm[TASK_COMM_LEN]; 505 506 trace_find_cmdline(entry->pid, comm); 507 508 if (!trace_seq_printf(s, "%8.8s-%-5d %3d", 509 comm, entry->pid, cpu)) 510 return 0; 511 512 return trace_print_lat_fmt(s, entry); 513 } 514 515 static unsigned long preempt_mark_thresh = 100; 516 517 static int 518 lat_print_timestamp(struct trace_seq *s, u64 abs_usecs, 519 unsigned long rel_usecs) 520 { 521 return trace_seq_printf(s, " %4lldus%c: ", abs_usecs, 522 rel_usecs > preempt_mark_thresh ? '!' : 523 rel_usecs > 1 ? '+' : ' '); 524 } 525 526 int trace_print_context(struct trace_iterator *iter) 527 { 528 struct trace_seq *s = &iter->seq; 529 struct trace_entry *entry = iter->ent; 530 unsigned long long t = ns2usecs(iter->ts); 531 unsigned long usec_rem = do_div(t, USEC_PER_SEC); 532 unsigned long secs = (unsigned long)t; 533 char comm[TASK_COMM_LEN]; 534 535 trace_find_cmdline(entry->pid, comm); 536 537 return trace_seq_printf(s, "%16s-%-5d [%03d] %5lu.%06lu: ", 538 comm, entry->pid, iter->cpu, secs, usec_rem); 539 } 540 541 int trace_print_lat_context(struct trace_iterator *iter) 542 { 543 u64 next_ts; 544 int ret; 545 struct trace_seq *s = &iter->seq; 546 struct trace_entry *entry = iter->ent, 547 *next_entry = trace_find_next_entry(iter, NULL, 548 &next_ts); 549 unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE); 550 unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start); 551 unsigned long rel_usecs; 552 553 if (!next_entry) 554 next_ts = iter->ts; 555 rel_usecs = ns2usecs(next_ts - iter->ts); 556 557 if (verbose) { 558 char comm[TASK_COMM_LEN]; 559 560 trace_find_cmdline(entry->pid, comm); 561 562 ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08llx]" 563 " %ld.%03ldms (+%ld.%03ldms): ", comm, 564 entry->pid, iter->cpu, entry->flags, 565 entry->preempt_count, iter->idx, 566 ns2usecs(iter->ts), 567 abs_usecs / USEC_PER_MSEC, 568 abs_usecs % USEC_PER_MSEC, 569 rel_usecs / USEC_PER_MSEC, 570 rel_usecs % USEC_PER_MSEC); 571 } else { 572 ret = lat_print_generic(s, entry, iter->cpu); 573 if (ret) 574 ret = lat_print_timestamp(s, abs_usecs, rel_usecs); 575 } 576 577 return ret; 578 } 579 580 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR; 581 582 static int task_state_char(unsigned long state) 583 { 584 int bit = state ? __ffs(state) + 1 : 0; 585 586 return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?'; 587 } 588 589 /** 590 * ftrace_find_event - find a registered event 591 * @type: the type of event to look for 592 * 593 * Returns an event of type @type otherwise NULL 594 * Called with trace_event_read_lock() held. 595 */ 596 struct trace_event *ftrace_find_event(int type) 597 { 598 struct trace_event *event; 599 struct hlist_node *n; 600 unsigned key; 601 602 key = type & (EVENT_HASHSIZE - 1); 603 604 hlist_for_each_entry(event, n, &event_hash[key], node) { 605 if (event->type == type) 606 return event; 607 } 608 609 return NULL; 610 } 611 612 static LIST_HEAD(ftrace_event_list); 613 614 static int trace_search_list(struct list_head **list) 615 { 616 struct trace_event *e; 617 int last = __TRACE_LAST_TYPE; 618 619 if (list_empty(&ftrace_event_list)) { 620 *list = &ftrace_event_list; 621 return last + 1; 622 } 623 624 /* 625 * We used up all possible max events, 626 * lets see if somebody freed one. 627 */ 628 list_for_each_entry(e, &ftrace_event_list, list) { 629 if (e->type != last + 1) 630 break; 631 last++; 632 } 633 634 /* Did we used up all 65 thousand events??? */ 635 if ((last + 1) > FTRACE_MAX_EVENT) 636 return 0; 637 638 *list = &e->list; 639 return last + 1; 640 } 641 642 void trace_event_read_lock(void) 643 { 644 down_read(&trace_event_mutex); 645 } 646 647 void trace_event_read_unlock(void) 648 { 649 up_read(&trace_event_mutex); 650 } 651 652 /** 653 * register_ftrace_event - register output for an event type 654 * @event: the event type to register 655 * 656 * Event types are stored in a hash and this hash is used to 657 * find a way to print an event. If the @event->type is set 658 * then it will use that type, otherwise it will assign a 659 * type to use. 660 * 661 * If you assign your own type, please make sure it is added 662 * to the trace_type enum in trace.h, to avoid collisions 663 * with the dynamic types. 664 * 665 * Returns the event type number or zero on error. 666 */ 667 int register_ftrace_event(struct trace_event *event) 668 { 669 unsigned key; 670 int ret = 0; 671 672 down_write(&trace_event_mutex); 673 674 if (WARN_ON(!event)) 675 goto out; 676 677 INIT_LIST_HEAD(&event->list); 678 679 if (!event->type) { 680 struct list_head *list = NULL; 681 682 if (next_event_type > FTRACE_MAX_EVENT) { 683 684 event->type = trace_search_list(&list); 685 if (!event->type) 686 goto out; 687 688 } else { 689 690 event->type = next_event_type++; 691 list = &ftrace_event_list; 692 } 693 694 if (WARN_ON(ftrace_find_event(event->type))) 695 goto out; 696 697 list_add_tail(&event->list, list); 698 699 } else if (event->type > __TRACE_LAST_TYPE) { 700 printk(KERN_WARNING "Need to add type to trace.h\n"); 701 WARN_ON(1); 702 goto out; 703 } else { 704 /* Is this event already used */ 705 if (ftrace_find_event(event->type)) 706 goto out; 707 } 708 709 if (event->trace == NULL) 710 event->trace = trace_nop_print; 711 if (event->raw == NULL) 712 event->raw = trace_nop_print; 713 if (event->hex == NULL) 714 event->hex = trace_nop_print; 715 if (event->binary == NULL) 716 event->binary = trace_nop_print; 717 718 key = event->type & (EVENT_HASHSIZE - 1); 719 720 hlist_add_head(&event->node, &event_hash[key]); 721 722 ret = event->type; 723 out: 724 up_write(&trace_event_mutex); 725 726 return ret; 727 } 728 EXPORT_SYMBOL_GPL(register_ftrace_event); 729 730 /* 731 * Used by module code with the trace_event_mutex held for write. 732 */ 733 int __unregister_ftrace_event(struct trace_event *event) 734 { 735 hlist_del(&event->node); 736 list_del(&event->list); 737 return 0; 738 } 739 740 /** 741 * unregister_ftrace_event - remove a no longer used event 742 * @event: the event to remove 743 */ 744 int unregister_ftrace_event(struct trace_event *event) 745 { 746 down_write(&trace_event_mutex); 747 __unregister_ftrace_event(event); 748 up_write(&trace_event_mutex); 749 750 return 0; 751 } 752 EXPORT_SYMBOL_GPL(unregister_ftrace_event); 753 754 /* 755 * Standard events 756 */ 757 758 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags) 759 { 760 return TRACE_TYPE_HANDLED; 761 } 762 763 /* TRACE_FN */ 764 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags) 765 { 766 struct ftrace_entry *field; 767 struct trace_seq *s = &iter->seq; 768 769 trace_assign_type(field, iter->ent); 770 771 if (!seq_print_ip_sym(s, field->ip, flags)) 772 goto partial; 773 774 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) { 775 if (!trace_seq_printf(s, " <-")) 776 goto partial; 777 if (!seq_print_ip_sym(s, 778 field->parent_ip, 779 flags)) 780 goto partial; 781 } 782 if (!trace_seq_printf(s, "\n")) 783 goto partial; 784 785 return TRACE_TYPE_HANDLED; 786 787 partial: 788 return TRACE_TYPE_PARTIAL_LINE; 789 } 790 791 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags) 792 { 793 struct ftrace_entry *field; 794 795 trace_assign_type(field, iter->ent); 796 797 if (!trace_seq_printf(&iter->seq, "%lx %lx\n", 798 field->ip, 799 field->parent_ip)) 800 return TRACE_TYPE_PARTIAL_LINE; 801 802 return TRACE_TYPE_HANDLED; 803 } 804 805 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags) 806 { 807 struct ftrace_entry *field; 808 struct trace_seq *s = &iter->seq; 809 810 trace_assign_type(field, iter->ent); 811 812 SEQ_PUT_HEX_FIELD_RET(s, field->ip); 813 SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip); 814 815 return TRACE_TYPE_HANDLED; 816 } 817 818 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags) 819 { 820 struct ftrace_entry *field; 821 struct trace_seq *s = &iter->seq; 822 823 trace_assign_type(field, iter->ent); 824 825 SEQ_PUT_FIELD_RET(s, field->ip); 826 SEQ_PUT_FIELD_RET(s, field->parent_ip); 827 828 return TRACE_TYPE_HANDLED; 829 } 830 831 static struct trace_event trace_fn_event = { 832 .type = TRACE_FN, 833 .trace = trace_fn_trace, 834 .raw = trace_fn_raw, 835 .hex = trace_fn_hex, 836 .binary = trace_fn_bin, 837 }; 838 839 /* TRACE_CTX an TRACE_WAKE */ 840 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter, 841 char *delim) 842 { 843 struct ctx_switch_entry *field; 844 char comm[TASK_COMM_LEN]; 845 int S, T; 846 847 848 trace_assign_type(field, iter->ent); 849 850 T = task_state_char(field->next_state); 851 S = task_state_char(field->prev_state); 852 trace_find_cmdline(field->next_pid, comm); 853 if (!trace_seq_printf(&iter->seq, 854 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n", 855 field->prev_pid, 856 field->prev_prio, 857 S, delim, 858 field->next_cpu, 859 field->next_pid, 860 field->next_prio, 861 T, comm)) 862 return TRACE_TYPE_PARTIAL_LINE; 863 864 return TRACE_TYPE_HANDLED; 865 } 866 867 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags) 868 { 869 return trace_ctxwake_print(iter, "==>"); 870 } 871 872 static enum print_line_t trace_wake_print(struct trace_iterator *iter, 873 int flags) 874 { 875 return trace_ctxwake_print(iter, " +"); 876 } 877 878 static int trace_ctxwake_raw(struct trace_iterator *iter, char S) 879 { 880 struct ctx_switch_entry *field; 881 int T; 882 883 trace_assign_type(field, iter->ent); 884 885 if (!S) 886 task_state_char(field->prev_state); 887 T = task_state_char(field->next_state); 888 if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n", 889 field->prev_pid, 890 field->prev_prio, 891 S, 892 field->next_cpu, 893 field->next_pid, 894 field->next_prio, 895 T)) 896 return TRACE_TYPE_PARTIAL_LINE; 897 898 return TRACE_TYPE_HANDLED; 899 } 900 901 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags) 902 { 903 return trace_ctxwake_raw(iter, 0); 904 } 905 906 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags) 907 { 908 return trace_ctxwake_raw(iter, '+'); 909 } 910 911 912 static int trace_ctxwake_hex(struct trace_iterator *iter, char S) 913 { 914 struct ctx_switch_entry *field; 915 struct trace_seq *s = &iter->seq; 916 int T; 917 918 trace_assign_type(field, iter->ent); 919 920 if (!S) 921 task_state_char(field->prev_state); 922 T = task_state_char(field->next_state); 923 924 SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid); 925 SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio); 926 SEQ_PUT_HEX_FIELD_RET(s, S); 927 SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu); 928 SEQ_PUT_HEX_FIELD_RET(s, field->next_pid); 929 SEQ_PUT_HEX_FIELD_RET(s, field->next_prio); 930 SEQ_PUT_HEX_FIELD_RET(s, T); 931 932 return TRACE_TYPE_HANDLED; 933 } 934 935 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags) 936 { 937 return trace_ctxwake_hex(iter, 0); 938 } 939 940 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags) 941 { 942 return trace_ctxwake_hex(iter, '+'); 943 } 944 945 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter, 946 int flags) 947 { 948 struct ctx_switch_entry *field; 949 struct trace_seq *s = &iter->seq; 950 951 trace_assign_type(field, iter->ent); 952 953 SEQ_PUT_FIELD_RET(s, field->prev_pid); 954 SEQ_PUT_FIELD_RET(s, field->prev_prio); 955 SEQ_PUT_FIELD_RET(s, field->prev_state); 956 SEQ_PUT_FIELD_RET(s, field->next_pid); 957 SEQ_PUT_FIELD_RET(s, field->next_prio); 958 SEQ_PUT_FIELD_RET(s, field->next_state); 959 960 return TRACE_TYPE_HANDLED; 961 } 962 963 static struct trace_event trace_ctx_event = { 964 .type = TRACE_CTX, 965 .trace = trace_ctx_print, 966 .raw = trace_ctx_raw, 967 .hex = trace_ctx_hex, 968 .binary = trace_ctxwake_bin, 969 }; 970 971 static struct trace_event trace_wake_event = { 972 .type = TRACE_WAKE, 973 .trace = trace_wake_print, 974 .raw = trace_wake_raw, 975 .hex = trace_wake_hex, 976 .binary = trace_ctxwake_bin, 977 }; 978 979 /* TRACE_SPECIAL */ 980 static enum print_line_t trace_special_print(struct trace_iterator *iter, 981 int flags) 982 { 983 struct special_entry *field; 984 985 trace_assign_type(field, iter->ent); 986 987 if (!trace_seq_printf(&iter->seq, "# %ld %ld %ld\n", 988 field->arg1, 989 field->arg2, 990 field->arg3)) 991 return TRACE_TYPE_PARTIAL_LINE; 992 993 return TRACE_TYPE_HANDLED; 994 } 995 996 static enum print_line_t trace_special_hex(struct trace_iterator *iter, 997 int flags) 998 { 999 struct special_entry *field; 1000 struct trace_seq *s = &iter->seq; 1001 1002 trace_assign_type(field, iter->ent); 1003 1004 SEQ_PUT_HEX_FIELD_RET(s, field->arg1); 1005 SEQ_PUT_HEX_FIELD_RET(s, field->arg2); 1006 SEQ_PUT_HEX_FIELD_RET(s, field->arg3); 1007 1008 return TRACE_TYPE_HANDLED; 1009 } 1010 1011 static enum print_line_t trace_special_bin(struct trace_iterator *iter, 1012 int flags) 1013 { 1014 struct special_entry *field; 1015 struct trace_seq *s = &iter->seq; 1016 1017 trace_assign_type(field, iter->ent); 1018 1019 SEQ_PUT_FIELD_RET(s, field->arg1); 1020 SEQ_PUT_FIELD_RET(s, field->arg2); 1021 SEQ_PUT_FIELD_RET(s, field->arg3); 1022 1023 return TRACE_TYPE_HANDLED; 1024 } 1025 1026 static struct trace_event trace_special_event = { 1027 .type = TRACE_SPECIAL, 1028 .trace = trace_special_print, 1029 .raw = trace_special_print, 1030 .hex = trace_special_hex, 1031 .binary = trace_special_bin, 1032 }; 1033 1034 /* TRACE_STACK */ 1035 1036 static enum print_line_t trace_stack_print(struct trace_iterator *iter, 1037 int flags) 1038 { 1039 struct stack_entry *field; 1040 struct trace_seq *s = &iter->seq; 1041 int i; 1042 1043 trace_assign_type(field, iter->ent); 1044 1045 if (!trace_seq_puts(s, "<stack trace>\n")) 1046 goto partial; 1047 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { 1048 if (!field->caller[i] || (field->caller[i] == ULONG_MAX)) 1049 break; 1050 if (!trace_seq_puts(s, " => ")) 1051 goto partial; 1052 1053 if (!seq_print_ip_sym(s, field->caller[i], flags)) 1054 goto partial; 1055 if (!trace_seq_puts(s, "\n")) 1056 goto partial; 1057 } 1058 1059 return TRACE_TYPE_HANDLED; 1060 1061 partial: 1062 return TRACE_TYPE_PARTIAL_LINE; 1063 } 1064 1065 static struct trace_event trace_stack_event = { 1066 .type = TRACE_STACK, 1067 .trace = trace_stack_print, 1068 .raw = trace_special_print, 1069 .hex = trace_special_hex, 1070 .binary = trace_special_bin, 1071 }; 1072 1073 /* TRACE_USER_STACK */ 1074 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter, 1075 int flags) 1076 { 1077 struct userstack_entry *field; 1078 struct trace_seq *s = &iter->seq; 1079 1080 trace_assign_type(field, iter->ent); 1081 1082 if (!trace_seq_puts(s, "<user stack trace>\n")) 1083 goto partial; 1084 1085 if (!seq_print_userip_objs(field, s, flags)) 1086 goto partial; 1087 1088 return TRACE_TYPE_HANDLED; 1089 1090 partial: 1091 return TRACE_TYPE_PARTIAL_LINE; 1092 } 1093 1094 static struct trace_event trace_user_stack_event = { 1095 .type = TRACE_USER_STACK, 1096 .trace = trace_user_stack_print, 1097 .raw = trace_special_print, 1098 .hex = trace_special_hex, 1099 .binary = trace_special_bin, 1100 }; 1101 1102 /* TRACE_BPRINT */ 1103 static enum print_line_t 1104 trace_bprint_print(struct trace_iterator *iter, int flags) 1105 { 1106 struct trace_entry *entry = iter->ent; 1107 struct trace_seq *s = &iter->seq; 1108 struct bprint_entry *field; 1109 1110 trace_assign_type(field, entry); 1111 1112 if (!seq_print_ip_sym(s, field->ip, flags)) 1113 goto partial; 1114 1115 if (!trace_seq_puts(s, ": ")) 1116 goto partial; 1117 1118 if (!trace_seq_bprintf(s, field->fmt, field->buf)) 1119 goto partial; 1120 1121 return TRACE_TYPE_HANDLED; 1122 1123 partial: 1124 return TRACE_TYPE_PARTIAL_LINE; 1125 } 1126 1127 1128 static enum print_line_t 1129 trace_bprint_raw(struct trace_iterator *iter, int flags) 1130 { 1131 struct bprint_entry *field; 1132 struct trace_seq *s = &iter->seq; 1133 1134 trace_assign_type(field, iter->ent); 1135 1136 if (!trace_seq_printf(s, ": %lx : ", field->ip)) 1137 goto partial; 1138 1139 if (!trace_seq_bprintf(s, field->fmt, field->buf)) 1140 goto partial; 1141 1142 return TRACE_TYPE_HANDLED; 1143 1144 partial: 1145 return TRACE_TYPE_PARTIAL_LINE; 1146 } 1147 1148 1149 static struct trace_event trace_bprint_event = { 1150 .type = TRACE_BPRINT, 1151 .trace = trace_bprint_print, 1152 .raw = trace_bprint_raw, 1153 }; 1154 1155 /* TRACE_PRINT */ 1156 static enum print_line_t trace_print_print(struct trace_iterator *iter, 1157 int flags) 1158 { 1159 struct print_entry *field; 1160 struct trace_seq *s = &iter->seq; 1161 1162 trace_assign_type(field, iter->ent); 1163 1164 if (!seq_print_ip_sym(s, field->ip, flags)) 1165 goto partial; 1166 1167 if (!trace_seq_printf(s, ": %s", field->buf)) 1168 goto partial; 1169 1170 return TRACE_TYPE_HANDLED; 1171 1172 partial: 1173 return TRACE_TYPE_PARTIAL_LINE; 1174 } 1175 1176 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags) 1177 { 1178 struct print_entry *field; 1179 1180 trace_assign_type(field, iter->ent); 1181 1182 if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf)) 1183 goto partial; 1184 1185 return TRACE_TYPE_HANDLED; 1186 1187 partial: 1188 return TRACE_TYPE_PARTIAL_LINE; 1189 } 1190 1191 static struct trace_event trace_print_event = { 1192 .type = TRACE_PRINT, 1193 .trace = trace_print_print, 1194 .raw = trace_print_raw, 1195 }; 1196 1197 1198 static struct trace_event *events[] __initdata = { 1199 &trace_fn_event, 1200 &trace_ctx_event, 1201 &trace_wake_event, 1202 &trace_special_event, 1203 &trace_stack_event, 1204 &trace_user_stack_event, 1205 &trace_bprint_event, 1206 &trace_print_event, 1207 NULL 1208 }; 1209 1210 __init static int init_events(void) 1211 { 1212 struct trace_event *event; 1213 int i, ret; 1214 1215 for (i = 0; events[i]; i++) { 1216 event = events[i]; 1217 1218 ret = register_ftrace_event(event); 1219 if (!ret) { 1220 printk(KERN_WARNING "event %d failed to register\n", 1221 event->type); 1222 WARN_ON_ONCE(1); 1223 } 1224 } 1225 1226 return 0; 1227 } 1228 device_initcall(init_events); 1229