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->ent.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 static int 464 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu) 465 { 466 int hardirq, softirq; 467 char comm[TASK_COMM_LEN]; 468 469 trace_find_cmdline(entry->pid, comm); 470 hardirq = entry->flags & TRACE_FLAG_HARDIRQ; 471 softirq = entry->flags & TRACE_FLAG_SOFTIRQ; 472 473 if (!trace_seq_printf(s, "%8.8s-%-5d %3d%c%c%c", 474 comm, entry->pid, cpu, 475 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : 476 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 477 'X' : '.', 478 (entry->flags & TRACE_FLAG_NEED_RESCHED) ? 479 'N' : '.', 480 (hardirq && softirq) ? 'H' : 481 hardirq ? 'h' : softirq ? 's' : '.')) 482 return 0; 483 484 if (entry->preempt_count) 485 return trace_seq_printf(s, "%x", entry->preempt_count); 486 return trace_seq_puts(s, "."); 487 } 488 489 static unsigned long preempt_mark_thresh = 100; 490 491 static int 492 lat_print_timestamp(struct trace_seq *s, u64 abs_usecs, 493 unsigned long rel_usecs) 494 { 495 return trace_seq_printf(s, " %4lldus%c: ", abs_usecs, 496 rel_usecs > preempt_mark_thresh ? '!' : 497 rel_usecs > 1 ? '+' : ' '); 498 } 499 500 int trace_print_context(struct trace_iterator *iter) 501 { 502 struct trace_seq *s = &iter->seq; 503 struct trace_entry *entry = iter->ent; 504 unsigned long long t = ns2usecs(iter->ts); 505 unsigned long usec_rem = do_div(t, USEC_PER_SEC); 506 unsigned long secs = (unsigned long)t; 507 char comm[TASK_COMM_LEN]; 508 509 trace_find_cmdline(entry->pid, comm); 510 511 return trace_seq_printf(s, "%16s-%-5d [%03d] %5lu.%06lu: ", 512 comm, entry->pid, iter->cpu, secs, usec_rem); 513 } 514 515 int trace_print_lat_context(struct trace_iterator *iter) 516 { 517 u64 next_ts; 518 int ret; 519 struct trace_seq *s = &iter->seq; 520 struct trace_entry *entry = iter->ent, 521 *next_entry = trace_find_next_entry(iter, NULL, 522 &next_ts); 523 unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE); 524 unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start); 525 unsigned long rel_usecs; 526 527 if (!next_entry) 528 next_ts = iter->ts; 529 rel_usecs = ns2usecs(next_ts - iter->ts); 530 531 if (verbose) { 532 char comm[TASK_COMM_LEN]; 533 534 trace_find_cmdline(entry->pid, comm); 535 536 ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08llx]" 537 " %ld.%03ldms (+%ld.%03ldms): ", comm, 538 entry->pid, iter->cpu, entry->flags, 539 entry->preempt_count, iter->idx, 540 ns2usecs(iter->ts), 541 abs_usecs / USEC_PER_MSEC, 542 abs_usecs % USEC_PER_MSEC, 543 rel_usecs / USEC_PER_MSEC, 544 rel_usecs % USEC_PER_MSEC); 545 } else { 546 ret = lat_print_generic(s, entry, iter->cpu); 547 if (ret) 548 ret = lat_print_timestamp(s, abs_usecs, rel_usecs); 549 } 550 551 return ret; 552 } 553 554 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR; 555 556 static int task_state_char(unsigned long state) 557 { 558 int bit = state ? __ffs(state) + 1 : 0; 559 560 return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?'; 561 } 562 563 /** 564 * ftrace_find_event - find a registered event 565 * @type: the type of event to look for 566 * 567 * Returns an event of type @type otherwise NULL 568 * Called with trace_event_read_lock() held. 569 */ 570 struct trace_event *ftrace_find_event(int type) 571 { 572 struct trace_event *event; 573 struct hlist_node *n; 574 unsigned key; 575 576 key = type & (EVENT_HASHSIZE - 1); 577 578 hlist_for_each_entry(event, n, &event_hash[key], node) { 579 if (event->type == type) 580 return event; 581 } 582 583 return NULL; 584 } 585 586 static LIST_HEAD(ftrace_event_list); 587 588 static int trace_search_list(struct list_head **list) 589 { 590 struct trace_event *e; 591 int last = __TRACE_LAST_TYPE; 592 593 if (list_empty(&ftrace_event_list)) { 594 *list = &ftrace_event_list; 595 return last + 1; 596 } 597 598 /* 599 * We used up all possible max events, 600 * lets see if somebody freed one. 601 */ 602 list_for_each_entry(e, &ftrace_event_list, list) { 603 if (e->type != last + 1) 604 break; 605 last++; 606 } 607 608 /* Did we used up all 65 thousand events??? */ 609 if ((last + 1) > FTRACE_MAX_EVENT) 610 return 0; 611 612 *list = &e->list; 613 return last + 1; 614 } 615 616 void trace_event_read_lock(void) 617 { 618 down_read(&trace_event_mutex); 619 } 620 621 void trace_event_read_unlock(void) 622 { 623 up_read(&trace_event_mutex); 624 } 625 626 /** 627 * register_ftrace_event - register output for an event type 628 * @event: the event type to register 629 * 630 * Event types are stored in a hash and this hash is used to 631 * find a way to print an event. If the @event->type is set 632 * then it will use that type, otherwise it will assign a 633 * type to use. 634 * 635 * If you assign your own type, please make sure it is added 636 * to the trace_type enum in trace.h, to avoid collisions 637 * with the dynamic types. 638 * 639 * Returns the event type number or zero on error. 640 */ 641 int register_ftrace_event(struct trace_event *event) 642 { 643 unsigned key; 644 int ret = 0; 645 646 down_write(&trace_event_mutex); 647 648 if (WARN_ON(!event)) 649 goto out; 650 651 INIT_LIST_HEAD(&event->list); 652 653 if (!event->type) { 654 struct list_head *list = NULL; 655 656 if (next_event_type > FTRACE_MAX_EVENT) { 657 658 event->type = trace_search_list(&list); 659 if (!event->type) 660 goto out; 661 662 } else { 663 664 event->type = next_event_type++; 665 list = &ftrace_event_list; 666 } 667 668 if (WARN_ON(ftrace_find_event(event->type))) 669 goto out; 670 671 list_add_tail(&event->list, list); 672 673 } else if (event->type > __TRACE_LAST_TYPE) { 674 printk(KERN_WARNING "Need to add type to trace.h\n"); 675 WARN_ON(1); 676 goto out; 677 } else { 678 /* Is this event already used */ 679 if (ftrace_find_event(event->type)) 680 goto out; 681 } 682 683 if (event->trace == NULL) 684 event->trace = trace_nop_print; 685 if (event->raw == NULL) 686 event->raw = trace_nop_print; 687 if (event->hex == NULL) 688 event->hex = trace_nop_print; 689 if (event->binary == NULL) 690 event->binary = trace_nop_print; 691 692 key = event->type & (EVENT_HASHSIZE - 1); 693 694 hlist_add_head(&event->node, &event_hash[key]); 695 696 ret = event->type; 697 out: 698 up_write(&trace_event_mutex); 699 700 return ret; 701 } 702 EXPORT_SYMBOL_GPL(register_ftrace_event); 703 704 /* 705 * Used by module code with the trace_event_mutex held for write. 706 */ 707 int __unregister_ftrace_event(struct trace_event *event) 708 { 709 hlist_del(&event->node); 710 list_del(&event->list); 711 return 0; 712 } 713 714 /** 715 * unregister_ftrace_event - remove a no longer used event 716 * @event: the event to remove 717 */ 718 int unregister_ftrace_event(struct trace_event *event) 719 { 720 down_write(&trace_event_mutex); 721 __unregister_ftrace_event(event); 722 up_write(&trace_event_mutex); 723 724 return 0; 725 } 726 EXPORT_SYMBOL_GPL(unregister_ftrace_event); 727 728 /* 729 * Standard events 730 */ 731 732 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags) 733 { 734 return TRACE_TYPE_HANDLED; 735 } 736 737 /* TRACE_FN */ 738 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags) 739 { 740 struct ftrace_entry *field; 741 struct trace_seq *s = &iter->seq; 742 743 trace_assign_type(field, iter->ent); 744 745 if (!seq_print_ip_sym(s, field->ip, flags)) 746 goto partial; 747 748 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) { 749 if (!trace_seq_printf(s, " <-")) 750 goto partial; 751 if (!seq_print_ip_sym(s, 752 field->parent_ip, 753 flags)) 754 goto partial; 755 } 756 if (!trace_seq_printf(s, "\n")) 757 goto partial; 758 759 return TRACE_TYPE_HANDLED; 760 761 partial: 762 return TRACE_TYPE_PARTIAL_LINE; 763 } 764 765 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags) 766 { 767 struct ftrace_entry *field; 768 769 trace_assign_type(field, iter->ent); 770 771 if (!trace_seq_printf(&iter->seq, "%lx %lx\n", 772 field->ip, 773 field->parent_ip)) 774 return TRACE_TYPE_PARTIAL_LINE; 775 776 return TRACE_TYPE_HANDLED; 777 } 778 779 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags) 780 { 781 struct ftrace_entry *field; 782 struct trace_seq *s = &iter->seq; 783 784 trace_assign_type(field, iter->ent); 785 786 SEQ_PUT_HEX_FIELD_RET(s, field->ip); 787 SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip); 788 789 return TRACE_TYPE_HANDLED; 790 } 791 792 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags) 793 { 794 struct ftrace_entry *field; 795 struct trace_seq *s = &iter->seq; 796 797 trace_assign_type(field, iter->ent); 798 799 SEQ_PUT_FIELD_RET(s, field->ip); 800 SEQ_PUT_FIELD_RET(s, field->parent_ip); 801 802 return TRACE_TYPE_HANDLED; 803 } 804 805 static struct trace_event trace_fn_event = { 806 .type = TRACE_FN, 807 .trace = trace_fn_trace, 808 .raw = trace_fn_raw, 809 .hex = trace_fn_hex, 810 .binary = trace_fn_bin, 811 }; 812 813 /* TRACE_CTX an TRACE_WAKE */ 814 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter, 815 char *delim) 816 { 817 struct ctx_switch_entry *field; 818 char comm[TASK_COMM_LEN]; 819 int S, T; 820 821 822 trace_assign_type(field, iter->ent); 823 824 T = task_state_char(field->next_state); 825 S = task_state_char(field->prev_state); 826 trace_find_cmdline(field->next_pid, comm); 827 if (!trace_seq_printf(&iter->seq, 828 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n", 829 field->prev_pid, 830 field->prev_prio, 831 S, delim, 832 field->next_cpu, 833 field->next_pid, 834 field->next_prio, 835 T, comm)) 836 return TRACE_TYPE_PARTIAL_LINE; 837 838 return TRACE_TYPE_HANDLED; 839 } 840 841 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags) 842 { 843 return trace_ctxwake_print(iter, "==>"); 844 } 845 846 static enum print_line_t trace_wake_print(struct trace_iterator *iter, 847 int flags) 848 { 849 return trace_ctxwake_print(iter, " +"); 850 } 851 852 static int trace_ctxwake_raw(struct trace_iterator *iter, char S) 853 { 854 struct ctx_switch_entry *field; 855 int T; 856 857 trace_assign_type(field, iter->ent); 858 859 if (!S) 860 task_state_char(field->prev_state); 861 T = task_state_char(field->next_state); 862 if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n", 863 field->prev_pid, 864 field->prev_prio, 865 S, 866 field->next_cpu, 867 field->next_pid, 868 field->next_prio, 869 T)) 870 return TRACE_TYPE_PARTIAL_LINE; 871 872 return TRACE_TYPE_HANDLED; 873 } 874 875 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags) 876 { 877 return trace_ctxwake_raw(iter, 0); 878 } 879 880 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags) 881 { 882 return trace_ctxwake_raw(iter, '+'); 883 } 884 885 886 static int trace_ctxwake_hex(struct trace_iterator *iter, char S) 887 { 888 struct ctx_switch_entry *field; 889 struct trace_seq *s = &iter->seq; 890 int T; 891 892 trace_assign_type(field, iter->ent); 893 894 if (!S) 895 task_state_char(field->prev_state); 896 T = task_state_char(field->next_state); 897 898 SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid); 899 SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio); 900 SEQ_PUT_HEX_FIELD_RET(s, S); 901 SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu); 902 SEQ_PUT_HEX_FIELD_RET(s, field->next_pid); 903 SEQ_PUT_HEX_FIELD_RET(s, field->next_prio); 904 SEQ_PUT_HEX_FIELD_RET(s, T); 905 906 return TRACE_TYPE_HANDLED; 907 } 908 909 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags) 910 { 911 return trace_ctxwake_hex(iter, 0); 912 } 913 914 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags) 915 { 916 return trace_ctxwake_hex(iter, '+'); 917 } 918 919 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter, 920 int flags) 921 { 922 struct ctx_switch_entry *field; 923 struct trace_seq *s = &iter->seq; 924 925 trace_assign_type(field, iter->ent); 926 927 SEQ_PUT_FIELD_RET(s, field->prev_pid); 928 SEQ_PUT_FIELD_RET(s, field->prev_prio); 929 SEQ_PUT_FIELD_RET(s, field->prev_state); 930 SEQ_PUT_FIELD_RET(s, field->next_pid); 931 SEQ_PUT_FIELD_RET(s, field->next_prio); 932 SEQ_PUT_FIELD_RET(s, field->next_state); 933 934 return TRACE_TYPE_HANDLED; 935 } 936 937 static struct trace_event trace_ctx_event = { 938 .type = TRACE_CTX, 939 .trace = trace_ctx_print, 940 .raw = trace_ctx_raw, 941 .hex = trace_ctx_hex, 942 .binary = trace_ctxwake_bin, 943 }; 944 945 static struct trace_event trace_wake_event = { 946 .type = TRACE_WAKE, 947 .trace = trace_wake_print, 948 .raw = trace_wake_raw, 949 .hex = trace_wake_hex, 950 .binary = trace_ctxwake_bin, 951 }; 952 953 /* TRACE_SPECIAL */ 954 static enum print_line_t trace_special_print(struct trace_iterator *iter, 955 int flags) 956 { 957 struct special_entry *field; 958 959 trace_assign_type(field, iter->ent); 960 961 if (!trace_seq_printf(&iter->seq, "# %ld %ld %ld\n", 962 field->arg1, 963 field->arg2, 964 field->arg3)) 965 return TRACE_TYPE_PARTIAL_LINE; 966 967 return TRACE_TYPE_HANDLED; 968 } 969 970 static enum print_line_t trace_special_hex(struct trace_iterator *iter, 971 int flags) 972 { 973 struct special_entry *field; 974 struct trace_seq *s = &iter->seq; 975 976 trace_assign_type(field, iter->ent); 977 978 SEQ_PUT_HEX_FIELD_RET(s, field->arg1); 979 SEQ_PUT_HEX_FIELD_RET(s, field->arg2); 980 SEQ_PUT_HEX_FIELD_RET(s, field->arg3); 981 982 return TRACE_TYPE_HANDLED; 983 } 984 985 static enum print_line_t trace_special_bin(struct trace_iterator *iter, 986 int flags) 987 { 988 struct special_entry *field; 989 struct trace_seq *s = &iter->seq; 990 991 trace_assign_type(field, iter->ent); 992 993 SEQ_PUT_FIELD_RET(s, field->arg1); 994 SEQ_PUT_FIELD_RET(s, field->arg2); 995 SEQ_PUT_FIELD_RET(s, field->arg3); 996 997 return TRACE_TYPE_HANDLED; 998 } 999 1000 static struct trace_event trace_special_event = { 1001 .type = TRACE_SPECIAL, 1002 .trace = trace_special_print, 1003 .raw = trace_special_print, 1004 .hex = trace_special_hex, 1005 .binary = trace_special_bin, 1006 }; 1007 1008 /* TRACE_STACK */ 1009 1010 static enum print_line_t trace_stack_print(struct trace_iterator *iter, 1011 int flags) 1012 { 1013 struct stack_entry *field; 1014 struct trace_seq *s = &iter->seq; 1015 int i; 1016 1017 trace_assign_type(field, iter->ent); 1018 1019 if (!trace_seq_puts(s, "<stack trace>\n")) 1020 goto partial; 1021 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { 1022 if (!field->caller[i] || (field->caller[i] == ULONG_MAX)) 1023 break; 1024 if (!trace_seq_puts(s, " => ")) 1025 goto partial; 1026 1027 if (!seq_print_ip_sym(s, field->caller[i], flags)) 1028 goto partial; 1029 if (!trace_seq_puts(s, "\n")) 1030 goto partial; 1031 } 1032 1033 return TRACE_TYPE_HANDLED; 1034 1035 partial: 1036 return TRACE_TYPE_PARTIAL_LINE; 1037 } 1038 1039 static struct trace_event trace_stack_event = { 1040 .type = TRACE_STACK, 1041 .trace = trace_stack_print, 1042 .raw = trace_special_print, 1043 .hex = trace_special_hex, 1044 .binary = trace_special_bin, 1045 }; 1046 1047 /* TRACE_USER_STACK */ 1048 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter, 1049 int flags) 1050 { 1051 struct userstack_entry *field; 1052 struct trace_seq *s = &iter->seq; 1053 1054 trace_assign_type(field, iter->ent); 1055 1056 if (!trace_seq_puts(s, "<user stack trace>\n")) 1057 goto partial; 1058 1059 if (!seq_print_userip_objs(field, s, flags)) 1060 goto partial; 1061 1062 return TRACE_TYPE_HANDLED; 1063 1064 partial: 1065 return TRACE_TYPE_PARTIAL_LINE; 1066 } 1067 1068 static struct trace_event trace_user_stack_event = { 1069 .type = TRACE_USER_STACK, 1070 .trace = trace_user_stack_print, 1071 .raw = trace_special_print, 1072 .hex = trace_special_hex, 1073 .binary = trace_special_bin, 1074 }; 1075 1076 /* TRACE_BPRINT */ 1077 static enum print_line_t 1078 trace_bprint_print(struct trace_iterator *iter, int flags) 1079 { 1080 struct trace_entry *entry = iter->ent; 1081 struct trace_seq *s = &iter->seq; 1082 struct bprint_entry *field; 1083 1084 trace_assign_type(field, entry); 1085 1086 if (!seq_print_ip_sym(s, field->ip, flags)) 1087 goto partial; 1088 1089 if (!trace_seq_puts(s, ": ")) 1090 goto partial; 1091 1092 if (!trace_seq_bprintf(s, field->fmt, field->buf)) 1093 goto partial; 1094 1095 return TRACE_TYPE_HANDLED; 1096 1097 partial: 1098 return TRACE_TYPE_PARTIAL_LINE; 1099 } 1100 1101 1102 static enum print_line_t 1103 trace_bprint_raw(struct trace_iterator *iter, int flags) 1104 { 1105 struct bprint_entry *field; 1106 struct trace_seq *s = &iter->seq; 1107 1108 trace_assign_type(field, iter->ent); 1109 1110 if (!trace_seq_printf(s, ": %lx : ", field->ip)) 1111 goto partial; 1112 1113 if (!trace_seq_bprintf(s, field->fmt, field->buf)) 1114 goto partial; 1115 1116 return TRACE_TYPE_HANDLED; 1117 1118 partial: 1119 return TRACE_TYPE_PARTIAL_LINE; 1120 } 1121 1122 1123 static struct trace_event trace_bprint_event = { 1124 .type = TRACE_BPRINT, 1125 .trace = trace_bprint_print, 1126 .raw = trace_bprint_raw, 1127 }; 1128 1129 /* TRACE_PRINT */ 1130 static enum print_line_t trace_print_print(struct trace_iterator *iter, 1131 int flags) 1132 { 1133 struct print_entry *field; 1134 struct trace_seq *s = &iter->seq; 1135 1136 trace_assign_type(field, iter->ent); 1137 1138 if (!seq_print_ip_sym(s, field->ip, flags)) 1139 goto partial; 1140 1141 if (!trace_seq_printf(s, ": %s", field->buf)) 1142 goto partial; 1143 1144 return TRACE_TYPE_HANDLED; 1145 1146 partial: 1147 return TRACE_TYPE_PARTIAL_LINE; 1148 } 1149 1150 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags) 1151 { 1152 struct print_entry *field; 1153 1154 trace_assign_type(field, iter->ent); 1155 1156 if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf)) 1157 goto partial; 1158 1159 return TRACE_TYPE_HANDLED; 1160 1161 partial: 1162 return TRACE_TYPE_PARTIAL_LINE; 1163 } 1164 1165 static struct trace_event trace_print_event = { 1166 .type = TRACE_PRINT, 1167 .trace = trace_print_print, 1168 .raw = trace_print_raw, 1169 }; 1170 1171 1172 static struct trace_event *events[] __initdata = { 1173 &trace_fn_event, 1174 &trace_ctx_event, 1175 &trace_wake_event, 1176 &trace_special_event, 1177 &trace_stack_event, 1178 &trace_user_stack_event, 1179 &trace_bprint_event, 1180 &trace_print_event, 1181 NULL 1182 }; 1183 1184 __init static int init_events(void) 1185 { 1186 struct trace_event *event; 1187 int i, ret; 1188 1189 for (i = 0; events[i]; i++) { 1190 event = events[i]; 1191 1192 ret = register_ftrace_event(event); 1193 if (!ret) { 1194 printk(KERN_WARNING "event %d failed to register\n", 1195 event->type); 1196 WARN_ON_ONCE(1); 1197 } 1198 } 1199 1200 return 0; 1201 } 1202 device_initcall(init_events); 1203