1 /* 2 * trace_events_hist - trace event hist triggers 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; either version 2 of the License, or 7 * (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * Copyright (C) 2015 Tom Zanussi <tom.zanussi@linux.intel.com> 15 */ 16 17 #include <linux/module.h> 18 #include <linux/kallsyms.h> 19 #include <linux/mutex.h> 20 #include <linux/slab.h> 21 #include <linux/stacktrace.h> 22 #include <linux/rculist.h> 23 #include <linux/tracefs.h> 24 25 #include "tracing_map.h" 26 #include "trace.h" 27 28 #define SYNTH_SYSTEM "synthetic" 29 #define SYNTH_FIELDS_MAX 16 30 31 #define STR_VAR_LEN_MAX 32 /* must be multiple of sizeof(u64) */ 32 33 struct hist_field; 34 35 typedef u64 (*hist_field_fn_t) (struct hist_field *field, 36 struct tracing_map_elt *elt, 37 struct ring_buffer_event *rbe, 38 void *event); 39 40 #define HIST_FIELD_OPERANDS_MAX 2 41 #define HIST_FIELDS_MAX (TRACING_MAP_FIELDS_MAX + TRACING_MAP_VARS_MAX) 42 #define HIST_ACTIONS_MAX 8 43 44 enum field_op_id { 45 FIELD_OP_NONE, 46 FIELD_OP_PLUS, 47 FIELD_OP_MINUS, 48 FIELD_OP_UNARY_MINUS, 49 }; 50 51 struct hist_var { 52 char *name; 53 struct hist_trigger_data *hist_data; 54 unsigned int idx; 55 }; 56 57 struct hist_field { 58 struct ftrace_event_field *field; 59 unsigned long flags; 60 hist_field_fn_t fn; 61 unsigned int size; 62 unsigned int offset; 63 unsigned int is_signed; 64 const char *type; 65 struct hist_field *operands[HIST_FIELD_OPERANDS_MAX]; 66 struct hist_trigger_data *hist_data; 67 struct hist_var var; 68 enum field_op_id operator; 69 char *system; 70 char *event_name; 71 char *name; 72 unsigned int var_idx; 73 unsigned int var_ref_idx; 74 bool read_once; 75 }; 76 77 static u64 hist_field_none(struct hist_field *field, 78 struct tracing_map_elt *elt, 79 struct ring_buffer_event *rbe, 80 void *event) 81 { 82 return 0; 83 } 84 85 static u64 hist_field_counter(struct hist_field *field, 86 struct tracing_map_elt *elt, 87 struct ring_buffer_event *rbe, 88 void *event) 89 { 90 return 1; 91 } 92 93 static u64 hist_field_string(struct hist_field *hist_field, 94 struct tracing_map_elt *elt, 95 struct ring_buffer_event *rbe, 96 void *event) 97 { 98 char *addr = (char *)(event + hist_field->field->offset); 99 100 return (u64)(unsigned long)addr; 101 } 102 103 static u64 hist_field_dynstring(struct hist_field *hist_field, 104 struct tracing_map_elt *elt, 105 struct ring_buffer_event *rbe, 106 void *event) 107 { 108 u32 str_item = *(u32 *)(event + hist_field->field->offset); 109 int str_loc = str_item & 0xffff; 110 char *addr = (char *)(event + str_loc); 111 112 return (u64)(unsigned long)addr; 113 } 114 115 static u64 hist_field_pstring(struct hist_field *hist_field, 116 struct tracing_map_elt *elt, 117 struct ring_buffer_event *rbe, 118 void *event) 119 { 120 char **addr = (char **)(event + hist_field->field->offset); 121 122 return (u64)(unsigned long)*addr; 123 } 124 125 static u64 hist_field_log2(struct hist_field *hist_field, 126 struct tracing_map_elt *elt, 127 struct ring_buffer_event *rbe, 128 void *event) 129 { 130 struct hist_field *operand = hist_field->operands[0]; 131 132 u64 val = operand->fn(operand, elt, rbe, event); 133 134 return (u64) ilog2(roundup_pow_of_two(val)); 135 } 136 137 static u64 hist_field_plus(struct hist_field *hist_field, 138 struct tracing_map_elt *elt, 139 struct ring_buffer_event *rbe, 140 void *event) 141 { 142 struct hist_field *operand1 = hist_field->operands[0]; 143 struct hist_field *operand2 = hist_field->operands[1]; 144 145 u64 val1 = operand1->fn(operand1, elt, rbe, event); 146 u64 val2 = operand2->fn(operand2, elt, rbe, event); 147 148 return val1 + val2; 149 } 150 151 static u64 hist_field_minus(struct hist_field *hist_field, 152 struct tracing_map_elt *elt, 153 struct ring_buffer_event *rbe, 154 void *event) 155 { 156 struct hist_field *operand1 = hist_field->operands[0]; 157 struct hist_field *operand2 = hist_field->operands[1]; 158 159 u64 val1 = operand1->fn(operand1, elt, rbe, event); 160 u64 val2 = operand2->fn(operand2, elt, rbe, event); 161 162 return val1 - val2; 163 } 164 165 static u64 hist_field_unary_minus(struct hist_field *hist_field, 166 struct tracing_map_elt *elt, 167 struct ring_buffer_event *rbe, 168 void *event) 169 { 170 struct hist_field *operand = hist_field->operands[0]; 171 172 s64 sval = (s64)operand->fn(operand, elt, rbe, event); 173 u64 val = (u64)-sval; 174 175 return val; 176 } 177 178 #define DEFINE_HIST_FIELD_FN(type) \ 179 static u64 hist_field_##type(struct hist_field *hist_field, \ 180 struct tracing_map_elt *elt, \ 181 struct ring_buffer_event *rbe, \ 182 void *event) \ 183 { \ 184 type *addr = (type *)(event + hist_field->field->offset); \ 185 \ 186 return (u64)(unsigned long)*addr; \ 187 } 188 189 DEFINE_HIST_FIELD_FN(s64); 190 DEFINE_HIST_FIELD_FN(u64); 191 DEFINE_HIST_FIELD_FN(s32); 192 DEFINE_HIST_FIELD_FN(u32); 193 DEFINE_HIST_FIELD_FN(s16); 194 DEFINE_HIST_FIELD_FN(u16); 195 DEFINE_HIST_FIELD_FN(s8); 196 DEFINE_HIST_FIELD_FN(u8); 197 198 #define for_each_hist_field(i, hist_data) \ 199 for ((i) = 0; (i) < (hist_data)->n_fields; (i)++) 200 201 #define for_each_hist_val_field(i, hist_data) \ 202 for ((i) = 0; (i) < (hist_data)->n_vals; (i)++) 203 204 #define for_each_hist_key_field(i, hist_data) \ 205 for ((i) = (hist_data)->n_vals; (i) < (hist_data)->n_fields; (i)++) 206 207 #define HIST_STACKTRACE_DEPTH 16 208 #define HIST_STACKTRACE_SIZE (HIST_STACKTRACE_DEPTH * sizeof(unsigned long)) 209 #define HIST_STACKTRACE_SKIP 5 210 211 #define HITCOUNT_IDX 0 212 #define HIST_KEY_SIZE_MAX (MAX_FILTER_STR_VAL + HIST_STACKTRACE_SIZE) 213 214 enum hist_field_flags { 215 HIST_FIELD_FL_HITCOUNT = 1 << 0, 216 HIST_FIELD_FL_KEY = 1 << 1, 217 HIST_FIELD_FL_STRING = 1 << 2, 218 HIST_FIELD_FL_HEX = 1 << 3, 219 HIST_FIELD_FL_SYM = 1 << 4, 220 HIST_FIELD_FL_SYM_OFFSET = 1 << 5, 221 HIST_FIELD_FL_EXECNAME = 1 << 6, 222 HIST_FIELD_FL_SYSCALL = 1 << 7, 223 HIST_FIELD_FL_STACKTRACE = 1 << 8, 224 HIST_FIELD_FL_LOG2 = 1 << 9, 225 HIST_FIELD_FL_TIMESTAMP = 1 << 10, 226 HIST_FIELD_FL_TIMESTAMP_USECS = 1 << 11, 227 HIST_FIELD_FL_VAR = 1 << 12, 228 HIST_FIELD_FL_EXPR = 1 << 13, 229 HIST_FIELD_FL_VAR_REF = 1 << 14, 230 HIST_FIELD_FL_CPU = 1 << 15, 231 HIST_FIELD_FL_ALIAS = 1 << 16, 232 }; 233 234 struct var_defs { 235 unsigned int n_vars; 236 char *name[TRACING_MAP_VARS_MAX]; 237 char *expr[TRACING_MAP_VARS_MAX]; 238 }; 239 240 struct hist_trigger_attrs { 241 char *keys_str; 242 char *vals_str; 243 char *sort_key_str; 244 char *name; 245 char *clock; 246 bool pause; 247 bool cont; 248 bool clear; 249 bool ts_in_usecs; 250 unsigned int map_bits; 251 252 char *assignment_str[TRACING_MAP_VARS_MAX]; 253 unsigned int n_assignments; 254 255 char *action_str[HIST_ACTIONS_MAX]; 256 unsigned int n_actions; 257 258 struct var_defs var_defs; 259 }; 260 261 struct field_var { 262 struct hist_field *var; 263 struct hist_field *val; 264 }; 265 266 struct field_var_hist { 267 struct hist_trigger_data *hist_data; 268 char *cmd; 269 }; 270 271 struct hist_trigger_data { 272 struct hist_field *fields[HIST_FIELDS_MAX]; 273 unsigned int n_vals; 274 unsigned int n_keys; 275 unsigned int n_fields; 276 unsigned int n_vars; 277 unsigned int key_size; 278 struct tracing_map_sort_key sort_keys[TRACING_MAP_SORT_KEYS_MAX]; 279 unsigned int n_sort_keys; 280 struct trace_event_file *event_file; 281 struct hist_trigger_attrs *attrs; 282 struct tracing_map *map; 283 bool enable_timestamps; 284 bool remove; 285 struct hist_field *var_refs[TRACING_MAP_VARS_MAX]; 286 unsigned int n_var_refs; 287 288 struct action_data *actions[HIST_ACTIONS_MAX]; 289 unsigned int n_actions; 290 291 struct hist_field *synth_var_refs[SYNTH_FIELDS_MAX]; 292 unsigned int n_synth_var_refs; 293 struct field_var *field_vars[SYNTH_FIELDS_MAX]; 294 unsigned int n_field_vars; 295 unsigned int n_field_var_str; 296 struct field_var_hist *field_var_hists[SYNTH_FIELDS_MAX]; 297 unsigned int n_field_var_hists; 298 299 struct field_var *max_vars[SYNTH_FIELDS_MAX]; 300 unsigned int n_max_vars; 301 unsigned int n_max_var_str; 302 }; 303 304 struct synth_field { 305 char *type; 306 char *name; 307 size_t size; 308 bool is_signed; 309 bool is_string; 310 }; 311 312 struct synth_event { 313 struct list_head list; 314 int ref; 315 char *name; 316 struct synth_field **fields; 317 unsigned int n_fields; 318 unsigned int n_u64; 319 struct trace_event_class class; 320 struct trace_event_call call; 321 struct tracepoint *tp; 322 }; 323 324 struct action_data; 325 326 typedef void (*action_fn_t) (struct hist_trigger_data *hist_data, 327 struct tracing_map_elt *elt, void *rec, 328 struct ring_buffer_event *rbe, 329 struct action_data *data, u64 *var_ref_vals); 330 331 struct action_data { 332 action_fn_t fn; 333 unsigned int n_params; 334 char *params[SYNTH_FIELDS_MAX]; 335 336 union { 337 struct { 338 unsigned int var_ref_idx; 339 char *match_event; 340 char *match_event_system; 341 char *synth_event_name; 342 struct synth_event *synth_event; 343 } onmatch; 344 345 struct { 346 char *var_str; 347 char *fn_name; 348 unsigned int max_var_ref_idx; 349 struct hist_field *max_var; 350 struct hist_field *var; 351 } onmax; 352 }; 353 }; 354 355 356 static char last_hist_cmd[MAX_FILTER_STR_VAL]; 357 static char hist_err_str[MAX_FILTER_STR_VAL]; 358 359 static void last_cmd_set(char *str) 360 { 361 if (!str) 362 return; 363 364 strncpy(last_hist_cmd, str, MAX_FILTER_STR_VAL - 1); 365 } 366 367 static void hist_err(char *str, char *var) 368 { 369 int maxlen = MAX_FILTER_STR_VAL - 1; 370 371 if (!str) 372 return; 373 374 if (strlen(hist_err_str)) 375 return; 376 377 if (!var) 378 var = ""; 379 380 if (strlen(hist_err_str) + strlen(str) + strlen(var) > maxlen) 381 return; 382 383 strcat(hist_err_str, str); 384 strcat(hist_err_str, var); 385 } 386 387 static void hist_err_event(char *str, char *system, char *event, char *var) 388 { 389 char err[MAX_FILTER_STR_VAL]; 390 391 if (system && var) 392 snprintf(err, MAX_FILTER_STR_VAL, "%s.%s.%s", system, event, var); 393 else if (system) 394 snprintf(err, MAX_FILTER_STR_VAL, "%s.%s", system, event); 395 else 396 strncpy(err, var, MAX_FILTER_STR_VAL); 397 398 hist_err(str, err); 399 } 400 401 static void hist_err_clear(void) 402 { 403 hist_err_str[0] = '\0'; 404 } 405 406 static bool have_hist_err(void) 407 { 408 if (strlen(hist_err_str)) 409 return true; 410 411 return false; 412 } 413 414 static LIST_HEAD(synth_event_list); 415 static DEFINE_MUTEX(synth_event_mutex); 416 417 struct synth_trace_event { 418 struct trace_entry ent; 419 u64 fields[]; 420 }; 421 422 static int synth_event_define_fields(struct trace_event_call *call) 423 { 424 struct synth_trace_event trace; 425 int offset = offsetof(typeof(trace), fields); 426 struct synth_event *event = call->data; 427 unsigned int i, size, n_u64; 428 char *name, *type; 429 bool is_signed; 430 int ret = 0; 431 432 for (i = 0, n_u64 = 0; i < event->n_fields; i++) { 433 size = event->fields[i]->size; 434 is_signed = event->fields[i]->is_signed; 435 type = event->fields[i]->type; 436 name = event->fields[i]->name; 437 ret = trace_define_field(call, type, name, offset, size, 438 is_signed, FILTER_OTHER); 439 if (ret) 440 break; 441 442 if (event->fields[i]->is_string) { 443 offset += STR_VAR_LEN_MAX; 444 n_u64 += STR_VAR_LEN_MAX / sizeof(u64); 445 } else { 446 offset += sizeof(u64); 447 n_u64++; 448 } 449 } 450 451 event->n_u64 = n_u64; 452 453 return ret; 454 } 455 456 static bool synth_field_signed(char *type) 457 { 458 if (strncmp(type, "u", 1) == 0) 459 return false; 460 461 return true; 462 } 463 464 static int synth_field_is_string(char *type) 465 { 466 if (strstr(type, "char[") != NULL) 467 return true; 468 469 return false; 470 } 471 472 static int synth_field_string_size(char *type) 473 { 474 char buf[4], *end, *start; 475 unsigned int len; 476 int size, err; 477 478 start = strstr(type, "char["); 479 if (start == NULL) 480 return -EINVAL; 481 start += strlen("char["); 482 483 end = strchr(type, ']'); 484 if (!end || end < start) 485 return -EINVAL; 486 487 len = end - start; 488 if (len > 3) 489 return -EINVAL; 490 491 strncpy(buf, start, len); 492 buf[len] = '\0'; 493 494 err = kstrtouint(buf, 0, &size); 495 if (err) 496 return err; 497 498 if (size > STR_VAR_LEN_MAX) 499 return -EINVAL; 500 501 return size; 502 } 503 504 static int synth_field_size(char *type) 505 { 506 int size = 0; 507 508 if (strcmp(type, "s64") == 0) 509 size = sizeof(s64); 510 else if (strcmp(type, "u64") == 0) 511 size = sizeof(u64); 512 else if (strcmp(type, "s32") == 0) 513 size = sizeof(s32); 514 else if (strcmp(type, "u32") == 0) 515 size = sizeof(u32); 516 else if (strcmp(type, "s16") == 0) 517 size = sizeof(s16); 518 else if (strcmp(type, "u16") == 0) 519 size = sizeof(u16); 520 else if (strcmp(type, "s8") == 0) 521 size = sizeof(s8); 522 else if (strcmp(type, "u8") == 0) 523 size = sizeof(u8); 524 else if (strcmp(type, "char") == 0) 525 size = sizeof(char); 526 else if (strcmp(type, "unsigned char") == 0) 527 size = sizeof(unsigned char); 528 else if (strcmp(type, "int") == 0) 529 size = sizeof(int); 530 else if (strcmp(type, "unsigned int") == 0) 531 size = sizeof(unsigned int); 532 else if (strcmp(type, "long") == 0) 533 size = sizeof(long); 534 else if (strcmp(type, "unsigned long") == 0) 535 size = sizeof(unsigned long); 536 else if (strcmp(type, "pid_t") == 0) 537 size = sizeof(pid_t); 538 else if (synth_field_is_string(type)) 539 size = synth_field_string_size(type); 540 541 return size; 542 } 543 544 static const char *synth_field_fmt(char *type) 545 { 546 const char *fmt = "%llu"; 547 548 if (strcmp(type, "s64") == 0) 549 fmt = "%lld"; 550 else if (strcmp(type, "u64") == 0) 551 fmt = "%llu"; 552 else if (strcmp(type, "s32") == 0) 553 fmt = "%d"; 554 else if (strcmp(type, "u32") == 0) 555 fmt = "%u"; 556 else if (strcmp(type, "s16") == 0) 557 fmt = "%d"; 558 else if (strcmp(type, "u16") == 0) 559 fmt = "%u"; 560 else if (strcmp(type, "s8") == 0) 561 fmt = "%d"; 562 else if (strcmp(type, "u8") == 0) 563 fmt = "%u"; 564 else if (strcmp(type, "char") == 0) 565 fmt = "%d"; 566 else if (strcmp(type, "unsigned char") == 0) 567 fmt = "%u"; 568 else if (strcmp(type, "int") == 0) 569 fmt = "%d"; 570 else if (strcmp(type, "unsigned int") == 0) 571 fmt = "%u"; 572 else if (strcmp(type, "long") == 0) 573 fmt = "%ld"; 574 else if (strcmp(type, "unsigned long") == 0) 575 fmt = "%lu"; 576 else if (strcmp(type, "pid_t") == 0) 577 fmt = "%d"; 578 else if (synth_field_is_string(type)) 579 fmt = "%s"; 580 581 return fmt; 582 } 583 584 static enum print_line_t print_synth_event(struct trace_iterator *iter, 585 int flags, 586 struct trace_event *event) 587 { 588 struct trace_array *tr = iter->tr; 589 struct trace_seq *s = &iter->seq; 590 struct synth_trace_event *entry; 591 struct synth_event *se; 592 unsigned int i, n_u64; 593 char print_fmt[32]; 594 const char *fmt; 595 596 entry = (struct synth_trace_event *)iter->ent; 597 se = container_of(event, struct synth_event, call.event); 598 599 trace_seq_printf(s, "%s: ", se->name); 600 601 for (i = 0, n_u64 = 0; i < se->n_fields; i++) { 602 if (trace_seq_has_overflowed(s)) 603 goto end; 604 605 fmt = synth_field_fmt(se->fields[i]->type); 606 607 /* parameter types */ 608 if (tr->trace_flags & TRACE_ITER_VERBOSE) 609 trace_seq_printf(s, "%s ", fmt); 610 611 snprintf(print_fmt, sizeof(print_fmt), "%%s=%s%%s", fmt); 612 613 /* parameter values */ 614 if (se->fields[i]->is_string) { 615 trace_seq_printf(s, print_fmt, se->fields[i]->name, 616 (char *)&entry->fields[n_u64], 617 i == se->n_fields - 1 ? "" : " "); 618 n_u64 += STR_VAR_LEN_MAX / sizeof(u64); 619 } else { 620 trace_seq_printf(s, print_fmt, se->fields[i]->name, 621 entry->fields[n_u64], 622 i == se->n_fields - 1 ? "" : " "); 623 n_u64++; 624 } 625 } 626 end: 627 trace_seq_putc(s, '\n'); 628 629 return trace_handle_return(s); 630 } 631 632 static struct trace_event_functions synth_event_funcs = { 633 .trace = print_synth_event 634 }; 635 636 static notrace void trace_event_raw_event_synth(void *__data, 637 u64 *var_ref_vals, 638 unsigned int var_ref_idx) 639 { 640 struct trace_event_file *trace_file = __data; 641 struct synth_trace_event *entry; 642 struct trace_event_buffer fbuffer; 643 struct ring_buffer *buffer; 644 struct synth_event *event; 645 unsigned int i, n_u64; 646 int fields_size = 0; 647 648 event = trace_file->event_call->data; 649 650 if (trace_trigger_soft_disabled(trace_file)) 651 return; 652 653 fields_size = event->n_u64 * sizeof(u64); 654 655 /* 656 * Avoid ring buffer recursion detection, as this event 657 * is being performed within another event. 658 */ 659 buffer = trace_file->tr->trace_buffer.buffer; 660 ring_buffer_nest_start(buffer); 661 662 entry = trace_event_buffer_reserve(&fbuffer, trace_file, 663 sizeof(*entry) + fields_size); 664 if (!entry) 665 goto out; 666 667 for (i = 0, n_u64 = 0; i < event->n_fields; i++) { 668 if (event->fields[i]->is_string) { 669 char *str_val = (char *)(long)var_ref_vals[var_ref_idx + i]; 670 char *str_field = (char *)&entry->fields[n_u64]; 671 672 strscpy(str_field, str_val, STR_VAR_LEN_MAX); 673 n_u64 += STR_VAR_LEN_MAX / sizeof(u64); 674 } else { 675 entry->fields[n_u64] = var_ref_vals[var_ref_idx + i]; 676 n_u64++; 677 } 678 } 679 680 trace_event_buffer_commit(&fbuffer); 681 out: 682 ring_buffer_nest_end(buffer); 683 } 684 685 static void free_synth_event_print_fmt(struct trace_event_call *call) 686 { 687 if (call) { 688 kfree(call->print_fmt); 689 call->print_fmt = NULL; 690 } 691 } 692 693 static int __set_synth_event_print_fmt(struct synth_event *event, 694 char *buf, int len) 695 { 696 const char *fmt; 697 int pos = 0; 698 int i; 699 700 /* When len=0, we just calculate the needed length */ 701 #define LEN_OR_ZERO (len ? len - pos : 0) 702 703 pos += snprintf(buf + pos, LEN_OR_ZERO, "\""); 704 for (i = 0; i < event->n_fields; i++) { 705 fmt = synth_field_fmt(event->fields[i]->type); 706 pos += snprintf(buf + pos, LEN_OR_ZERO, "%s=%s%s", 707 event->fields[i]->name, fmt, 708 i == event->n_fields - 1 ? "" : ", "); 709 } 710 pos += snprintf(buf + pos, LEN_OR_ZERO, "\""); 711 712 for (i = 0; i < event->n_fields; i++) { 713 pos += snprintf(buf + pos, LEN_OR_ZERO, 714 ", REC->%s", event->fields[i]->name); 715 } 716 717 #undef LEN_OR_ZERO 718 719 /* return the length of print_fmt */ 720 return pos; 721 } 722 723 static int set_synth_event_print_fmt(struct trace_event_call *call) 724 { 725 struct synth_event *event = call->data; 726 char *print_fmt; 727 int len; 728 729 /* First: called with 0 length to calculate the needed length */ 730 len = __set_synth_event_print_fmt(event, NULL, 0); 731 732 print_fmt = kmalloc(len + 1, GFP_KERNEL); 733 if (!print_fmt) 734 return -ENOMEM; 735 736 /* Second: actually write the @print_fmt */ 737 __set_synth_event_print_fmt(event, print_fmt, len + 1); 738 call->print_fmt = print_fmt; 739 740 return 0; 741 } 742 743 static void free_synth_field(struct synth_field *field) 744 { 745 kfree(field->type); 746 kfree(field->name); 747 kfree(field); 748 } 749 750 static struct synth_field *parse_synth_field(char *field_type, 751 char *field_name) 752 { 753 struct synth_field *field; 754 int len, ret = 0; 755 char *array; 756 757 if (field_type[0] == ';') 758 field_type++; 759 760 len = strlen(field_name); 761 if (field_name[len - 1] == ';') 762 field_name[len - 1] = '\0'; 763 764 field = kzalloc(sizeof(*field), GFP_KERNEL); 765 if (!field) 766 return ERR_PTR(-ENOMEM); 767 768 len = strlen(field_type) + 1; 769 array = strchr(field_name, '['); 770 if (array) 771 len += strlen(array); 772 field->type = kzalloc(len, GFP_KERNEL); 773 if (!field->type) { 774 ret = -ENOMEM; 775 goto free; 776 } 777 strcat(field->type, field_type); 778 if (array) { 779 strcat(field->type, array); 780 *array = '\0'; 781 } 782 783 field->size = synth_field_size(field->type); 784 if (!field->size) { 785 ret = -EINVAL; 786 goto free; 787 } 788 789 if (synth_field_is_string(field->type)) 790 field->is_string = true; 791 792 field->is_signed = synth_field_signed(field->type); 793 794 field->name = kstrdup(field_name, GFP_KERNEL); 795 if (!field->name) { 796 ret = -ENOMEM; 797 goto free; 798 } 799 out: 800 return field; 801 free: 802 free_synth_field(field); 803 field = ERR_PTR(ret); 804 goto out; 805 } 806 807 static void free_synth_tracepoint(struct tracepoint *tp) 808 { 809 if (!tp) 810 return; 811 812 kfree(tp->name); 813 kfree(tp); 814 } 815 816 static struct tracepoint *alloc_synth_tracepoint(char *name) 817 { 818 struct tracepoint *tp; 819 820 tp = kzalloc(sizeof(*tp), GFP_KERNEL); 821 if (!tp) 822 return ERR_PTR(-ENOMEM); 823 824 tp->name = kstrdup(name, GFP_KERNEL); 825 if (!tp->name) { 826 kfree(tp); 827 return ERR_PTR(-ENOMEM); 828 } 829 830 return tp; 831 } 832 833 typedef void (*synth_probe_func_t) (void *__data, u64 *var_ref_vals, 834 unsigned int var_ref_idx); 835 836 static inline void trace_synth(struct synth_event *event, u64 *var_ref_vals, 837 unsigned int var_ref_idx) 838 { 839 struct tracepoint *tp = event->tp; 840 841 if (unlikely(atomic_read(&tp->key.enabled) > 0)) { 842 struct tracepoint_func *probe_func_ptr; 843 synth_probe_func_t probe_func; 844 void *__data; 845 846 if (!(cpu_online(raw_smp_processor_id()))) 847 return; 848 849 probe_func_ptr = rcu_dereference_sched((tp)->funcs); 850 if (probe_func_ptr) { 851 do { 852 probe_func = probe_func_ptr->func; 853 __data = probe_func_ptr->data; 854 probe_func(__data, var_ref_vals, var_ref_idx); 855 } while ((++probe_func_ptr)->func); 856 } 857 } 858 } 859 860 static struct synth_event *find_synth_event(const char *name) 861 { 862 struct synth_event *event; 863 864 list_for_each_entry(event, &synth_event_list, list) { 865 if (strcmp(event->name, name) == 0) 866 return event; 867 } 868 869 return NULL; 870 } 871 872 static int register_synth_event(struct synth_event *event) 873 { 874 struct trace_event_call *call = &event->call; 875 int ret = 0; 876 877 event->call.class = &event->class; 878 event->class.system = kstrdup(SYNTH_SYSTEM, GFP_KERNEL); 879 if (!event->class.system) { 880 ret = -ENOMEM; 881 goto out; 882 } 883 884 event->tp = alloc_synth_tracepoint(event->name); 885 if (IS_ERR(event->tp)) { 886 ret = PTR_ERR(event->tp); 887 event->tp = NULL; 888 goto out; 889 } 890 891 INIT_LIST_HEAD(&call->class->fields); 892 call->event.funcs = &synth_event_funcs; 893 call->class->define_fields = synth_event_define_fields; 894 895 ret = register_trace_event(&call->event); 896 if (!ret) { 897 ret = -ENODEV; 898 goto out; 899 } 900 call->flags = TRACE_EVENT_FL_TRACEPOINT; 901 call->class->reg = trace_event_reg; 902 call->class->probe = trace_event_raw_event_synth; 903 call->data = event; 904 call->tp = event->tp; 905 906 ret = trace_add_event_call(call); 907 if (ret) { 908 pr_warn("Failed to register synthetic event: %s\n", 909 trace_event_name(call)); 910 goto err; 911 } 912 913 ret = set_synth_event_print_fmt(call); 914 if (ret < 0) { 915 trace_remove_event_call(call); 916 goto err; 917 } 918 out: 919 return ret; 920 err: 921 unregister_trace_event(&call->event); 922 goto out; 923 } 924 925 static int unregister_synth_event(struct synth_event *event) 926 { 927 struct trace_event_call *call = &event->call; 928 int ret; 929 930 ret = trace_remove_event_call(call); 931 932 return ret; 933 } 934 935 static void free_synth_event(struct synth_event *event) 936 { 937 unsigned int i; 938 939 if (!event) 940 return; 941 942 for (i = 0; i < event->n_fields; i++) 943 free_synth_field(event->fields[i]); 944 945 kfree(event->fields); 946 kfree(event->name); 947 kfree(event->class.system); 948 free_synth_tracepoint(event->tp); 949 free_synth_event_print_fmt(&event->call); 950 kfree(event); 951 } 952 953 static struct synth_event *alloc_synth_event(char *event_name, int n_fields, 954 struct synth_field **fields) 955 { 956 struct synth_event *event; 957 unsigned int i; 958 959 event = kzalloc(sizeof(*event), GFP_KERNEL); 960 if (!event) { 961 event = ERR_PTR(-ENOMEM); 962 goto out; 963 } 964 965 event->name = kstrdup(event_name, GFP_KERNEL); 966 if (!event->name) { 967 kfree(event); 968 event = ERR_PTR(-ENOMEM); 969 goto out; 970 } 971 972 event->fields = kcalloc(n_fields, sizeof(*event->fields), GFP_KERNEL); 973 if (!event->fields) { 974 free_synth_event(event); 975 event = ERR_PTR(-ENOMEM); 976 goto out; 977 } 978 979 for (i = 0; i < n_fields; i++) 980 event->fields[i] = fields[i]; 981 982 event->n_fields = n_fields; 983 out: 984 return event; 985 } 986 987 static void action_trace(struct hist_trigger_data *hist_data, 988 struct tracing_map_elt *elt, void *rec, 989 struct ring_buffer_event *rbe, 990 struct action_data *data, u64 *var_ref_vals) 991 { 992 struct synth_event *event = data->onmatch.synth_event; 993 994 trace_synth(event, var_ref_vals, data->onmatch.var_ref_idx); 995 } 996 997 struct hist_var_data { 998 struct list_head list; 999 struct hist_trigger_data *hist_data; 1000 }; 1001 1002 static void add_or_delete_synth_event(struct synth_event *event, int delete) 1003 { 1004 if (delete) 1005 free_synth_event(event); 1006 else { 1007 mutex_lock(&synth_event_mutex); 1008 if (!find_synth_event(event->name)) 1009 list_add(&event->list, &synth_event_list); 1010 else 1011 free_synth_event(event); 1012 mutex_unlock(&synth_event_mutex); 1013 } 1014 } 1015 1016 static int create_synth_event(int argc, char **argv) 1017 { 1018 struct synth_field *field, *fields[SYNTH_FIELDS_MAX]; 1019 struct synth_event *event = NULL; 1020 bool delete_event = false; 1021 int i, n_fields = 0, ret = 0; 1022 char *name; 1023 1024 mutex_lock(&synth_event_mutex); 1025 1026 /* 1027 * Argument syntax: 1028 * - Add synthetic event: <event_name> field[;field] ... 1029 * - Remove synthetic event: !<event_name> field[;field] ... 1030 * where 'field' = type field_name 1031 */ 1032 if (argc < 1) { 1033 ret = -EINVAL; 1034 goto out; 1035 } 1036 1037 name = argv[0]; 1038 if (name[0] == '!') { 1039 delete_event = true; 1040 name++; 1041 } 1042 1043 event = find_synth_event(name); 1044 if (event) { 1045 if (delete_event) { 1046 if (event->ref) { 1047 event = NULL; 1048 ret = -EBUSY; 1049 goto out; 1050 } 1051 list_del(&event->list); 1052 goto out; 1053 } 1054 event = NULL; 1055 ret = -EEXIST; 1056 goto out; 1057 } else if (delete_event) 1058 goto out; 1059 1060 if (argc < 2) { 1061 ret = -EINVAL; 1062 goto out; 1063 } 1064 1065 for (i = 1; i < argc - 1; i++) { 1066 if (strcmp(argv[i], ";") == 0) 1067 continue; 1068 if (n_fields == SYNTH_FIELDS_MAX) { 1069 ret = -EINVAL; 1070 goto err; 1071 } 1072 1073 field = parse_synth_field(argv[i], argv[i + 1]); 1074 if (IS_ERR(field)) { 1075 ret = PTR_ERR(field); 1076 goto err; 1077 } 1078 fields[n_fields] = field; 1079 i++; n_fields++; 1080 } 1081 1082 if (i < argc) { 1083 ret = -EINVAL; 1084 goto err; 1085 } 1086 1087 event = alloc_synth_event(name, n_fields, fields); 1088 if (IS_ERR(event)) { 1089 ret = PTR_ERR(event); 1090 event = NULL; 1091 goto err; 1092 } 1093 out: 1094 mutex_unlock(&synth_event_mutex); 1095 1096 if (event) { 1097 if (delete_event) { 1098 ret = unregister_synth_event(event); 1099 add_or_delete_synth_event(event, !ret); 1100 } else { 1101 ret = register_synth_event(event); 1102 add_or_delete_synth_event(event, ret); 1103 } 1104 } 1105 1106 return ret; 1107 err: 1108 mutex_unlock(&synth_event_mutex); 1109 1110 for (i = 0; i < n_fields; i++) 1111 free_synth_field(fields[i]); 1112 free_synth_event(event); 1113 1114 return ret; 1115 } 1116 1117 static int release_all_synth_events(void) 1118 { 1119 struct list_head release_events; 1120 struct synth_event *event, *e; 1121 int ret = 0; 1122 1123 INIT_LIST_HEAD(&release_events); 1124 1125 mutex_lock(&synth_event_mutex); 1126 1127 list_for_each_entry(event, &synth_event_list, list) { 1128 if (event->ref) { 1129 mutex_unlock(&synth_event_mutex); 1130 return -EBUSY; 1131 } 1132 } 1133 1134 list_splice_init(&event->list, &release_events); 1135 1136 mutex_unlock(&synth_event_mutex); 1137 1138 list_for_each_entry_safe(event, e, &release_events, list) { 1139 list_del(&event->list); 1140 1141 ret = unregister_synth_event(event); 1142 add_or_delete_synth_event(event, !ret); 1143 } 1144 1145 return ret; 1146 } 1147 1148 1149 static void *synth_events_seq_start(struct seq_file *m, loff_t *pos) 1150 { 1151 mutex_lock(&synth_event_mutex); 1152 1153 return seq_list_start(&synth_event_list, *pos); 1154 } 1155 1156 static void *synth_events_seq_next(struct seq_file *m, void *v, loff_t *pos) 1157 { 1158 return seq_list_next(v, &synth_event_list, pos); 1159 } 1160 1161 static void synth_events_seq_stop(struct seq_file *m, void *v) 1162 { 1163 mutex_unlock(&synth_event_mutex); 1164 } 1165 1166 static int synth_events_seq_show(struct seq_file *m, void *v) 1167 { 1168 struct synth_field *field; 1169 struct synth_event *event = v; 1170 unsigned int i; 1171 1172 seq_printf(m, "%s\t", event->name); 1173 1174 for (i = 0; i < event->n_fields; i++) { 1175 field = event->fields[i]; 1176 1177 /* parameter values */ 1178 seq_printf(m, "%s %s%s", field->type, field->name, 1179 i == event->n_fields - 1 ? "" : "; "); 1180 } 1181 1182 seq_putc(m, '\n'); 1183 1184 return 0; 1185 } 1186 1187 static const struct seq_operations synth_events_seq_op = { 1188 .start = synth_events_seq_start, 1189 .next = synth_events_seq_next, 1190 .stop = synth_events_seq_stop, 1191 .show = synth_events_seq_show 1192 }; 1193 1194 static int synth_events_open(struct inode *inode, struct file *file) 1195 { 1196 int ret; 1197 1198 if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) { 1199 ret = release_all_synth_events(); 1200 if (ret < 0) 1201 return ret; 1202 } 1203 1204 return seq_open(file, &synth_events_seq_op); 1205 } 1206 1207 static ssize_t synth_events_write(struct file *file, 1208 const char __user *buffer, 1209 size_t count, loff_t *ppos) 1210 { 1211 return trace_parse_run_command(file, buffer, count, ppos, 1212 create_synth_event); 1213 } 1214 1215 static const struct file_operations synth_events_fops = { 1216 .open = synth_events_open, 1217 .write = synth_events_write, 1218 .read = seq_read, 1219 .llseek = seq_lseek, 1220 .release = seq_release, 1221 }; 1222 1223 static u64 hist_field_timestamp(struct hist_field *hist_field, 1224 struct tracing_map_elt *elt, 1225 struct ring_buffer_event *rbe, 1226 void *event) 1227 { 1228 struct hist_trigger_data *hist_data = hist_field->hist_data; 1229 struct trace_array *tr = hist_data->event_file->tr; 1230 1231 u64 ts = ring_buffer_event_time_stamp(rbe); 1232 1233 if (hist_data->attrs->ts_in_usecs && trace_clock_in_ns(tr)) 1234 ts = ns2usecs(ts); 1235 1236 return ts; 1237 } 1238 1239 static u64 hist_field_cpu(struct hist_field *hist_field, 1240 struct tracing_map_elt *elt, 1241 struct ring_buffer_event *rbe, 1242 void *event) 1243 { 1244 int cpu = smp_processor_id(); 1245 1246 return cpu; 1247 } 1248 1249 static struct hist_field * 1250 check_field_for_var_ref(struct hist_field *hist_field, 1251 struct hist_trigger_data *var_data, 1252 unsigned int var_idx) 1253 { 1254 struct hist_field *found = NULL; 1255 1256 if (hist_field && hist_field->flags & HIST_FIELD_FL_VAR_REF) { 1257 if (hist_field->var.idx == var_idx && 1258 hist_field->var.hist_data == var_data) { 1259 found = hist_field; 1260 } 1261 } 1262 1263 return found; 1264 } 1265 1266 static struct hist_field * 1267 check_field_for_var_refs(struct hist_trigger_data *hist_data, 1268 struct hist_field *hist_field, 1269 struct hist_trigger_data *var_data, 1270 unsigned int var_idx, 1271 unsigned int level) 1272 { 1273 struct hist_field *found = NULL; 1274 unsigned int i; 1275 1276 if (level > 3) 1277 return found; 1278 1279 if (!hist_field) 1280 return found; 1281 1282 found = check_field_for_var_ref(hist_field, var_data, var_idx); 1283 if (found) 1284 return found; 1285 1286 for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++) { 1287 struct hist_field *operand; 1288 1289 operand = hist_field->operands[i]; 1290 found = check_field_for_var_refs(hist_data, operand, var_data, 1291 var_idx, level + 1); 1292 if (found) 1293 return found; 1294 } 1295 1296 return found; 1297 } 1298 1299 static struct hist_field *find_var_ref(struct hist_trigger_data *hist_data, 1300 struct hist_trigger_data *var_data, 1301 unsigned int var_idx) 1302 { 1303 struct hist_field *hist_field, *found = NULL; 1304 unsigned int i; 1305 1306 for_each_hist_field(i, hist_data) { 1307 hist_field = hist_data->fields[i]; 1308 found = check_field_for_var_refs(hist_data, hist_field, 1309 var_data, var_idx, 0); 1310 if (found) 1311 return found; 1312 } 1313 1314 for (i = 0; i < hist_data->n_synth_var_refs; i++) { 1315 hist_field = hist_data->synth_var_refs[i]; 1316 found = check_field_for_var_refs(hist_data, hist_field, 1317 var_data, var_idx, 0); 1318 if (found) 1319 return found; 1320 } 1321 1322 return found; 1323 } 1324 1325 static struct hist_field *find_any_var_ref(struct hist_trigger_data *hist_data, 1326 unsigned int var_idx) 1327 { 1328 struct trace_array *tr = hist_data->event_file->tr; 1329 struct hist_field *found = NULL; 1330 struct hist_var_data *var_data; 1331 1332 list_for_each_entry(var_data, &tr->hist_vars, list) { 1333 if (var_data->hist_data == hist_data) 1334 continue; 1335 found = find_var_ref(var_data->hist_data, hist_data, var_idx); 1336 if (found) 1337 break; 1338 } 1339 1340 return found; 1341 } 1342 1343 static bool check_var_refs(struct hist_trigger_data *hist_data) 1344 { 1345 struct hist_field *field; 1346 bool found = false; 1347 int i; 1348 1349 for_each_hist_field(i, hist_data) { 1350 field = hist_data->fields[i]; 1351 if (field && field->flags & HIST_FIELD_FL_VAR) { 1352 if (find_any_var_ref(hist_data, field->var.idx)) { 1353 found = true; 1354 break; 1355 } 1356 } 1357 } 1358 1359 return found; 1360 } 1361 1362 static struct hist_var_data *find_hist_vars(struct hist_trigger_data *hist_data) 1363 { 1364 struct trace_array *tr = hist_data->event_file->tr; 1365 struct hist_var_data *var_data, *found = NULL; 1366 1367 list_for_each_entry(var_data, &tr->hist_vars, list) { 1368 if (var_data->hist_data == hist_data) { 1369 found = var_data; 1370 break; 1371 } 1372 } 1373 1374 return found; 1375 } 1376 1377 static bool field_has_hist_vars(struct hist_field *hist_field, 1378 unsigned int level) 1379 { 1380 int i; 1381 1382 if (level > 3) 1383 return false; 1384 1385 if (!hist_field) 1386 return false; 1387 1388 if (hist_field->flags & HIST_FIELD_FL_VAR || 1389 hist_field->flags & HIST_FIELD_FL_VAR_REF) 1390 return true; 1391 1392 for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++) { 1393 struct hist_field *operand; 1394 1395 operand = hist_field->operands[i]; 1396 if (field_has_hist_vars(operand, level + 1)) 1397 return true; 1398 } 1399 1400 return false; 1401 } 1402 1403 static bool has_hist_vars(struct hist_trigger_data *hist_data) 1404 { 1405 struct hist_field *hist_field; 1406 int i; 1407 1408 for_each_hist_field(i, hist_data) { 1409 hist_field = hist_data->fields[i]; 1410 if (field_has_hist_vars(hist_field, 0)) 1411 return true; 1412 } 1413 1414 return false; 1415 } 1416 1417 static int save_hist_vars(struct hist_trigger_data *hist_data) 1418 { 1419 struct trace_array *tr = hist_data->event_file->tr; 1420 struct hist_var_data *var_data; 1421 1422 var_data = find_hist_vars(hist_data); 1423 if (var_data) 1424 return 0; 1425 1426 if (trace_array_get(tr) < 0) 1427 return -ENODEV; 1428 1429 var_data = kzalloc(sizeof(*var_data), GFP_KERNEL); 1430 if (!var_data) { 1431 trace_array_put(tr); 1432 return -ENOMEM; 1433 } 1434 1435 var_data->hist_data = hist_data; 1436 list_add(&var_data->list, &tr->hist_vars); 1437 1438 return 0; 1439 } 1440 1441 static void remove_hist_vars(struct hist_trigger_data *hist_data) 1442 { 1443 struct trace_array *tr = hist_data->event_file->tr; 1444 struct hist_var_data *var_data; 1445 1446 var_data = find_hist_vars(hist_data); 1447 if (!var_data) 1448 return; 1449 1450 if (WARN_ON(check_var_refs(hist_data))) 1451 return; 1452 1453 list_del(&var_data->list); 1454 1455 kfree(var_data); 1456 1457 trace_array_put(tr); 1458 } 1459 1460 static struct hist_field *find_var_field(struct hist_trigger_data *hist_data, 1461 const char *var_name) 1462 { 1463 struct hist_field *hist_field, *found = NULL; 1464 int i; 1465 1466 for_each_hist_field(i, hist_data) { 1467 hist_field = hist_data->fields[i]; 1468 if (hist_field && hist_field->flags & HIST_FIELD_FL_VAR && 1469 strcmp(hist_field->var.name, var_name) == 0) { 1470 found = hist_field; 1471 break; 1472 } 1473 } 1474 1475 return found; 1476 } 1477 1478 static struct hist_field *find_var(struct hist_trigger_data *hist_data, 1479 struct trace_event_file *file, 1480 const char *var_name) 1481 { 1482 struct hist_trigger_data *test_data; 1483 struct event_trigger_data *test; 1484 struct hist_field *hist_field; 1485 1486 hist_field = find_var_field(hist_data, var_name); 1487 if (hist_field) 1488 return hist_field; 1489 1490 list_for_each_entry_rcu(test, &file->triggers, list) { 1491 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { 1492 test_data = test->private_data; 1493 hist_field = find_var_field(test_data, var_name); 1494 if (hist_field) 1495 return hist_field; 1496 } 1497 } 1498 1499 return NULL; 1500 } 1501 1502 static struct trace_event_file *find_var_file(struct trace_array *tr, 1503 char *system, 1504 char *event_name, 1505 char *var_name) 1506 { 1507 struct hist_trigger_data *var_hist_data; 1508 struct hist_var_data *var_data; 1509 struct trace_event_file *file, *found = NULL; 1510 1511 if (system) 1512 return find_event_file(tr, system, event_name); 1513 1514 list_for_each_entry(var_data, &tr->hist_vars, list) { 1515 var_hist_data = var_data->hist_data; 1516 file = var_hist_data->event_file; 1517 if (file == found) 1518 continue; 1519 1520 if (find_var_field(var_hist_data, var_name)) { 1521 if (found) { 1522 hist_err_event("Variable name not unique, need to use fully qualified name (subsys.event.var) for variable: ", system, event_name, var_name); 1523 return NULL; 1524 } 1525 1526 found = file; 1527 } 1528 } 1529 1530 return found; 1531 } 1532 1533 static struct hist_field *find_file_var(struct trace_event_file *file, 1534 const char *var_name) 1535 { 1536 struct hist_trigger_data *test_data; 1537 struct event_trigger_data *test; 1538 struct hist_field *hist_field; 1539 1540 list_for_each_entry_rcu(test, &file->triggers, list) { 1541 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { 1542 test_data = test->private_data; 1543 hist_field = find_var_field(test_data, var_name); 1544 if (hist_field) 1545 return hist_field; 1546 } 1547 } 1548 1549 return NULL; 1550 } 1551 1552 static struct hist_field * 1553 find_match_var(struct hist_trigger_data *hist_data, char *var_name) 1554 { 1555 struct trace_array *tr = hist_data->event_file->tr; 1556 struct hist_field *hist_field, *found = NULL; 1557 struct trace_event_file *file; 1558 unsigned int i; 1559 1560 for (i = 0; i < hist_data->n_actions; i++) { 1561 struct action_data *data = hist_data->actions[i]; 1562 1563 if (data->fn == action_trace) { 1564 char *system = data->onmatch.match_event_system; 1565 char *event_name = data->onmatch.match_event; 1566 1567 file = find_var_file(tr, system, event_name, var_name); 1568 if (!file) 1569 continue; 1570 hist_field = find_file_var(file, var_name); 1571 if (hist_field) { 1572 if (found) { 1573 hist_err_event("Variable name not unique, need to use fully qualified name (subsys.event.var) for variable: ", system, event_name, var_name); 1574 return ERR_PTR(-EINVAL); 1575 } 1576 1577 found = hist_field; 1578 } 1579 } 1580 } 1581 return found; 1582 } 1583 1584 static struct hist_field *find_event_var(struct hist_trigger_data *hist_data, 1585 char *system, 1586 char *event_name, 1587 char *var_name) 1588 { 1589 struct trace_array *tr = hist_data->event_file->tr; 1590 struct hist_field *hist_field = NULL; 1591 struct trace_event_file *file; 1592 1593 if (!system || !event_name) { 1594 hist_field = find_match_var(hist_data, var_name); 1595 if (IS_ERR(hist_field)) 1596 return NULL; 1597 if (hist_field) 1598 return hist_field; 1599 } 1600 1601 file = find_var_file(tr, system, event_name, var_name); 1602 if (!file) 1603 return NULL; 1604 1605 hist_field = find_file_var(file, var_name); 1606 1607 return hist_field; 1608 } 1609 1610 struct hist_elt_data { 1611 char *comm; 1612 u64 *var_ref_vals; 1613 char *field_var_str[SYNTH_FIELDS_MAX]; 1614 }; 1615 1616 static u64 hist_field_var_ref(struct hist_field *hist_field, 1617 struct tracing_map_elt *elt, 1618 struct ring_buffer_event *rbe, 1619 void *event) 1620 { 1621 struct hist_elt_data *elt_data; 1622 u64 var_val = 0; 1623 1624 elt_data = elt->private_data; 1625 var_val = elt_data->var_ref_vals[hist_field->var_ref_idx]; 1626 1627 return var_val; 1628 } 1629 1630 static bool resolve_var_refs(struct hist_trigger_data *hist_data, void *key, 1631 u64 *var_ref_vals, bool self) 1632 { 1633 struct hist_trigger_data *var_data; 1634 struct tracing_map_elt *var_elt; 1635 struct hist_field *hist_field; 1636 unsigned int i, var_idx; 1637 bool resolved = true; 1638 u64 var_val = 0; 1639 1640 for (i = 0; i < hist_data->n_var_refs; i++) { 1641 hist_field = hist_data->var_refs[i]; 1642 var_idx = hist_field->var.idx; 1643 var_data = hist_field->var.hist_data; 1644 1645 if (var_data == NULL) { 1646 resolved = false; 1647 break; 1648 } 1649 1650 if ((self && var_data != hist_data) || 1651 (!self && var_data == hist_data)) 1652 continue; 1653 1654 var_elt = tracing_map_lookup(var_data->map, key); 1655 if (!var_elt) { 1656 resolved = false; 1657 break; 1658 } 1659 1660 if (!tracing_map_var_set(var_elt, var_idx)) { 1661 resolved = false; 1662 break; 1663 } 1664 1665 if (self || !hist_field->read_once) 1666 var_val = tracing_map_read_var(var_elt, var_idx); 1667 else 1668 var_val = tracing_map_read_var_once(var_elt, var_idx); 1669 1670 var_ref_vals[i] = var_val; 1671 } 1672 1673 return resolved; 1674 } 1675 1676 static const char *hist_field_name(struct hist_field *field, 1677 unsigned int level) 1678 { 1679 const char *field_name = ""; 1680 1681 if (level > 1) 1682 return field_name; 1683 1684 if (field->field) 1685 field_name = field->field->name; 1686 else if (field->flags & HIST_FIELD_FL_LOG2 || 1687 field->flags & HIST_FIELD_FL_ALIAS) 1688 field_name = hist_field_name(field->operands[0], ++level); 1689 else if (field->flags & HIST_FIELD_FL_CPU) 1690 field_name = "cpu"; 1691 else if (field->flags & HIST_FIELD_FL_EXPR || 1692 field->flags & HIST_FIELD_FL_VAR_REF) { 1693 if (field->system) { 1694 static char full_name[MAX_FILTER_STR_VAL]; 1695 1696 strcat(full_name, field->system); 1697 strcat(full_name, "."); 1698 strcat(full_name, field->event_name); 1699 strcat(full_name, "."); 1700 strcat(full_name, field->name); 1701 field_name = full_name; 1702 } else 1703 field_name = field->name; 1704 } else if (field->flags & HIST_FIELD_FL_TIMESTAMP) 1705 field_name = "common_timestamp"; 1706 1707 if (field_name == NULL) 1708 field_name = ""; 1709 1710 return field_name; 1711 } 1712 1713 static hist_field_fn_t select_value_fn(int field_size, int field_is_signed) 1714 { 1715 hist_field_fn_t fn = NULL; 1716 1717 switch (field_size) { 1718 case 8: 1719 if (field_is_signed) 1720 fn = hist_field_s64; 1721 else 1722 fn = hist_field_u64; 1723 break; 1724 case 4: 1725 if (field_is_signed) 1726 fn = hist_field_s32; 1727 else 1728 fn = hist_field_u32; 1729 break; 1730 case 2: 1731 if (field_is_signed) 1732 fn = hist_field_s16; 1733 else 1734 fn = hist_field_u16; 1735 break; 1736 case 1: 1737 if (field_is_signed) 1738 fn = hist_field_s8; 1739 else 1740 fn = hist_field_u8; 1741 break; 1742 } 1743 1744 return fn; 1745 } 1746 1747 static int parse_map_size(char *str) 1748 { 1749 unsigned long size, map_bits; 1750 int ret; 1751 1752 strsep(&str, "="); 1753 if (!str) { 1754 ret = -EINVAL; 1755 goto out; 1756 } 1757 1758 ret = kstrtoul(str, 0, &size); 1759 if (ret) 1760 goto out; 1761 1762 map_bits = ilog2(roundup_pow_of_two(size)); 1763 if (map_bits < TRACING_MAP_BITS_MIN || 1764 map_bits > TRACING_MAP_BITS_MAX) 1765 ret = -EINVAL; 1766 else 1767 ret = map_bits; 1768 out: 1769 return ret; 1770 } 1771 1772 static void destroy_hist_trigger_attrs(struct hist_trigger_attrs *attrs) 1773 { 1774 unsigned int i; 1775 1776 if (!attrs) 1777 return; 1778 1779 for (i = 0; i < attrs->n_assignments; i++) 1780 kfree(attrs->assignment_str[i]); 1781 1782 for (i = 0; i < attrs->n_actions; i++) 1783 kfree(attrs->action_str[i]); 1784 1785 kfree(attrs->name); 1786 kfree(attrs->sort_key_str); 1787 kfree(attrs->keys_str); 1788 kfree(attrs->vals_str); 1789 kfree(attrs->clock); 1790 kfree(attrs); 1791 } 1792 1793 static int parse_action(char *str, struct hist_trigger_attrs *attrs) 1794 { 1795 int ret = -EINVAL; 1796 1797 if (attrs->n_actions >= HIST_ACTIONS_MAX) 1798 return ret; 1799 1800 if ((strncmp(str, "onmatch(", strlen("onmatch(")) == 0) || 1801 (strncmp(str, "onmax(", strlen("onmax(")) == 0)) { 1802 attrs->action_str[attrs->n_actions] = kstrdup(str, GFP_KERNEL); 1803 if (!attrs->action_str[attrs->n_actions]) { 1804 ret = -ENOMEM; 1805 return ret; 1806 } 1807 attrs->n_actions++; 1808 ret = 0; 1809 } 1810 1811 return ret; 1812 } 1813 1814 static int parse_assignment(char *str, struct hist_trigger_attrs *attrs) 1815 { 1816 int ret = 0; 1817 1818 if ((strncmp(str, "key=", strlen("key=")) == 0) || 1819 (strncmp(str, "keys=", strlen("keys=")) == 0)) { 1820 attrs->keys_str = kstrdup(str, GFP_KERNEL); 1821 if (!attrs->keys_str) { 1822 ret = -ENOMEM; 1823 goto out; 1824 } 1825 } else if ((strncmp(str, "val=", strlen("val=")) == 0) || 1826 (strncmp(str, "vals=", strlen("vals=")) == 0) || 1827 (strncmp(str, "values=", strlen("values=")) == 0)) { 1828 attrs->vals_str = kstrdup(str, GFP_KERNEL); 1829 if (!attrs->vals_str) { 1830 ret = -ENOMEM; 1831 goto out; 1832 } 1833 } else if (strncmp(str, "sort=", strlen("sort=")) == 0) { 1834 attrs->sort_key_str = kstrdup(str, GFP_KERNEL); 1835 if (!attrs->sort_key_str) { 1836 ret = -ENOMEM; 1837 goto out; 1838 } 1839 } else if (strncmp(str, "name=", strlen("name=")) == 0) { 1840 attrs->name = kstrdup(str, GFP_KERNEL); 1841 if (!attrs->name) { 1842 ret = -ENOMEM; 1843 goto out; 1844 } 1845 } else if (strncmp(str, "clock=", strlen("clock=")) == 0) { 1846 strsep(&str, "="); 1847 if (!str) { 1848 ret = -EINVAL; 1849 goto out; 1850 } 1851 1852 str = strstrip(str); 1853 attrs->clock = kstrdup(str, GFP_KERNEL); 1854 if (!attrs->clock) { 1855 ret = -ENOMEM; 1856 goto out; 1857 } 1858 } else if (strncmp(str, "size=", strlen("size=")) == 0) { 1859 int map_bits = parse_map_size(str); 1860 1861 if (map_bits < 0) { 1862 ret = map_bits; 1863 goto out; 1864 } 1865 attrs->map_bits = map_bits; 1866 } else { 1867 char *assignment; 1868 1869 if (attrs->n_assignments == TRACING_MAP_VARS_MAX) { 1870 hist_err("Too many variables defined: ", str); 1871 ret = -EINVAL; 1872 goto out; 1873 } 1874 1875 assignment = kstrdup(str, GFP_KERNEL); 1876 if (!assignment) { 1877 ret = -ENOMEM; 1878 goto out; 1879 } 1880 1881 attrs->assignment_str[attrs->n_assignments++] = assignment; 1882 } 1883 out: 1884 return ret; 1885 } 1886 1887 static struct hist_trigger_attrs *parse_hist_trigger_attrs(char *trigger_str) 1888 { 1889 struct hist_trigger_attrs *attrs; 1890 int ret = 0; 1891 1892 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL); 1893 if (!attrs) 1894 return ERR_PTR(-ENOMEM); 1895 1896 while (trigger_str) { 1897 char *str = strsep(&trigger_str, ":"); 1898 1899 if (strchr(str, '=')) { 1900 ret = parse_assignment(str, attrs); 1901 if (ret) 1902 goto free; 1903 } else if (strcmp(str, "pause") == 0) 1904 attrs->pause = true; 1905 else if ((strcmp(str, "cont") == 0) || 1906 (strcmp(str, "continue") == 0)) 1907 attrs->cont = true; 1908 else if (strcmp(str, "clear") == 0) 1909 attrs->clear = true; 1910 else { 1911 ret = parse_action(str, attrs); 1912 if (ret) 1913 goto free; 1914 } 1915 } 1916 1917 if (!attrs->keys_str) { 1918 ret = -EINVAL; 1919 goto free; 1920 } 1921 1922 if (!attrs->clock) { 1923 attrs->clock = kstrdup("global", GFP_KERNEL); 1924 if (!attrs->clock) { 1925 ret = -ENOMEM; 1926 goto free; 1927 } 1928 } 1929 1930 return attrs; 1931 free: 1932 destroy_hist_trigger_attrs(attrs); 1933 1934 return ERR_PTR(ret); 1935 } 1936 1937 static inline void save_comm(char *comm, struct task_struct *task) 1938 { 1939 if (!task->pid) { 1940 strcpy(comm, "<idle>"); 1941 return; 1942 } 1943 1944 if (WARN_ON_ONCE(task->pid < 0)) { 1945 strcpy(comm, "<XXX>"); 1946 return; 1947 } 1948 1949 memcpy(comm, task->comm, TASK_COMM_LEN); 1950 } 1951 1952 static void hist_elt_data_free(struct hist_elt_data *elt_data) 1953 { 1954 unsigned int i; 1955 1956 for (i = 0; i < SYNTH_FIELDS_MAX; i++) 1957 kfree(elt_data->field_var_str[i]); 1958 1959 kfree(elt_data->comm); 1960 kfree(elt_data); 1961 } 1962 1963 static void hist_trigger_elt_data_free(struct tracing_map_elt *elt) 1964 { 1965 struct hist_elt_data *elt_data = elt->private_data; 1966 1967 hist_elt_data_free(elt_data); 1968 } 1969 1970 static int hist_trigger_elt_data_alloc(struct tracing_map_elt *elt) 1971 { 1972 struct hist_trigger_data *hist_data = elt->map->private_data; 1973 unsigned int size = TASK_COMM_LEN; 1974 struct hist_elt_data *elt_data; 1975 struct hist_field *key_field; 1976 unsigned int i, n_str; 1977 1978 elt_data = kzalloc(sizeof(*elt_data), GFP_KERNEL); 1979 if (!elt_data) 1980 return -ENOMEM; 1981 1982 for_each_hist_key_field(i, hist_data) { 1983 key_field = hist_data->fields[i]; 1984 1985 if (key_field->flags & HIST_FIELD_FL_EXECNAME) { 1986 elt_data->comm = kzalloc(size, GFP_KERNEL); 1987 if (!elt_data->comm) { 1988 kfree(elt_data); 1989 return -ENOMEM; 1990 } 1991 break; 1992 } 1993 } 1994 1995 n_str = hist_data->n_field_var_str + hist_data->n_max_var_str; 1996 1997 size = STR_VAR_LEN_MAX; 1998 1999 for (i = 0; i < n_str; i++) { 2000 elt_data->field_var_str[i] = kzalloc(size, GFP_KERNEL); 2001 if (!elt_data->field_var_str[i]) { 2002 hist_elt_data_free(elt_data); 2003 return -ENOMEM; 2004 } 2005 } 2006 2007 elt->private_data = elt_data; 2008 2009 return 0; 2010 } 2011 2012 static void hist_trigger_elt_data_init(struct tracing_map_elt *elt) 2013 { 2014 struct hist_elt_data *elt_data = elt->private_data; 2015 2016 if (elt_data->comm) 2017 save_comm(elt_data->comm, current); 2018 } 2019 2020 static const struct tracing_map_ops hist_trigger_elt_data_ops = { 2021 .elt_alloc = hist_trigger_elt_data_alloc, 2022 .elt_free = hist_trigger_elt_data_free, 2023 .elt_init = hist_trigger_elt_data_init, 2024 }; 2025 2026 static const char *get_hist_field_flags(struct hist_field *hist_field) 2027 { 2028 const char *flags_str = NULL; 2029 2030 if (hist_field->flags & HIST_FIELD_FL_HEX) 2031 flags_str = "hex"; 2032 else if (hist_field->flags & HIST_FIELD_FL_SYM) 2033 flags_str = "sym"; 2034 else if (hist_field->flags & HIST_FIELD_FL_SYM_OFFSET) 2035 flags_str = "sym-offset"; 2036 else if (hist_field->flags & HIST_FIELD_FL_EXECNAME) 2037 flags_str = "execname"; 2038 else if (hist_field->flags & HIST_FIELD_FL_SYSCALL) 2039 flags_str = "syscall"; 2040 else if (hist_field->flags & HIST_FIELD_FL_LOG2) 2041 flags_str = "log2"; 2042 else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP_USECS) 2043 flags_str = "usecs"; 2044 2045 return flags_str; 2046 } 2047 2048 static void expr_field_str(struct hist_field *field, char *expr) 2049 { 2050 if (field->flags & HIST_FIELD_FL_VAR_REF) 2051 strcat(expr, "$"); 2052 2053 strcat(expr, hist_field_name(field, 0)); 2054 2055 if (field->flags && !(field->flags & HIST_FIELD_FL_VAR_REF)) { 2056 const char *flags_str = get_hist_field_flags(field); 2057 2058 if (flags_str) { 2059 strcat(expr, "."); 2060 strcat(expr, flags_str); 2061 } 2062 } 2063 } 2064 2065 static char *expr_str(struct hist_field *field, unsigned int level) 2066 { 2067 char *expr; 2068 2069 if (level > 1) 2070 return NULL; 2071 2072 expr = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL); 2073 if (!expr) 2074 return NULL; 2075 2076 if (!field->operands[0]) { 2077 expr_field_str(field, expr); 2078 return expr; 2079 } 2080 2081 if (field->operator == FIELD_OP_UNARY_MINUS) { 2082 char *subexpr; 2083 2084 strcat(expr, "-("); 2085 subexpr = expr_str(field->operands[0], ++level); 2086 if (!subexpr) { 2087 kfree(expr); 2088 return NULL; 2089 } 2090 strcat(expr, subexpr); 2091 strcat(expr, ")"); 2092 2093 kfree(subexpr); 2094 2095 return expr; 2096 } 2097 2098 expr_field_str(field->operands[0], expr); 2099 2100 switch (field->operator) { 2101 case FIELD_OP_MINUS: 2102 strcat(expr, "-"); 2103 break; 2104 case FIELD_OP_PLUS: 2105 strcat(expr, "+"); 2106 break; 2107 default: 2108 kfree(expr); 2109 return NULL; 2110 } 2111 2112 expr_field_str(field->operands[1], expr); 2113 2114 return expr; 2115 } 2116 2117 static int contains_operator(char *str) 2118 { 2119 enum field_op_id field_op = FIELD_OP_NONE; 2120 char *op; 2121 2122 op = strpbrk(str, "+-"); 2123 if (!op) 2124 return FIELD_OP_NONE; 2125 2126 switch (*op) { 2127 case '-': 2128 if (*str == '-') 2129 field_op = FIELD_OP_UNARY_MINUS; 2130 else 2131 field_op = FIELD_OP_MINUS; 2132 break; 2133 case '+': 2134 field_op = FIELD_OP_PLUS; 2135 break; 2136 default: 2137 break; 2138 } 2139 2140 return field_op; 2141 } 2142 2143 static void destroy_hist_field(struct hist_field *hist_field, 2144 unsigned int level) 2145 { 2146 unsigned int i; 2147 2148 if (level > 3) 2149 return; 2150 2151 if (!hist_field) 2152 return; 2153 2154 for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++) 2155 destroy_hist_field(hist_field->operands[i], level + 1); 2156 2157 kfree(hist_field->var.name); 2158 kfree(hist_field->name); 2159 kfree(hist_field->type); 2160 2161 kfree(hist_field); 2162 } 2163 2164 static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data, 2165 struct ftrace_event_field *field, 2166 unsigned long flags, 2167 char *var_name) 2168 { 2169 struct hist_field *hist_field; 2170 2171 if (field && is_function_field(field)) 2172 return NULL; 2173 2174 hist_field = kzalloc(sizeof(struct hist_field), GFP_KERNEL); 2175 if (!hist_field) 2176 return NULL; 2177 2178 hist_field->hist_data = hist_data; 2179 2180 if (flags & HIST_FIELD_FL_EXPR || flags & HIST_FIELD_FL_ALIAS) 2181 goto out; /* caller will populate */ 2182 2183 if (flags & HIST_FIELD_FL_VAR_REF) { 2184 hist_field->fn = hist_field_var_ref; 2185 goto out; 2186 } 2187 2188 if (flags & HIST_FIELD_FL_HITCOUNT) { 2189 hist_field->fn = hist_field_counter; 2190 hist_field->size = sizeof(u64); 2191 hist_field->type = kstrdup("u64", GFP_KERNEL); 2192 if (!hist_field->type) 2193 goto free; 2194 goto out; 2195 } 2196 2197 if (flags & HIST_FIELD_FL_STACKTRACE) { 2198 hist_field->fn = hist_field_none; 2199 goto out; 2200 } 2201 2202 if (flags & HIST_FIELD_FL_LOG2) { 2203 unsigned long fl = flags & ~HIST_FIELD_FL_LOG2; 2204 hist_field->fn = hist_field_log2; 2205 hist_field->operands[0] = create_hist_field(hist_data, field, fl, NULL); 2206 hist_field->size = hist_field->operands[0]->size; 2207 hist_field->type = kstrdup(hist_field->operands[0]->type, GFP_KERNEL); 2208 if (!hist_field->type) 2209 goto free; 2210 goto out; 2211 } 2212 2213 if (flags & HIST_FIELD_FL_TIMESTAMP) { 2214 hist_field->fn = hist_field_timestamp; 2215 hist_field->size = sizeof(u64); 2216 hist_field->type = kstrdup("u64", GFP_KERNEL); 2217 if (!hist_field->type) 2218 goto free; 2219 goto out; 2220 } 2221 2222 if (flags & HIST_FIELD_FL_CPU) { 2223 hist_field->fn = hist_field_cpu; 2224 hist_field->size = sizeof(int); 2225 hist_field->type = kstrdup("unsigned int", GFP_KERNEL); 2226 if (!hist_field->type) 2227 goto free; 2228 goto out; 2229 } 2230 2231 if (WARN_ON_ONCE(!field)) 2232 goto out; 2233 2234 if (is_string_field(field)) { 2235 flags |= HIST_FIELD_FL_STRING; 2236 2237 hist_field->size = MAX_FILTER_STR_VAL; 2238 hist_field->type = kstrdup(field->type, GFP_KERNEL); 2239 if (!hist_field->type) 2240 goto free; 2241 2242 if (field->filter_type == FILTER_STATIC_STRING) 2243 hist_field->fn = hist_field_string; 2244 else if (field->filter_type == FILTER_DYN_STRING) 2245 hist_field->fn = hist_field_dynstring; 2246 else 2247 hist_field->fn = hist_field_pstring; 2248 } else { 2249 hist_field->size = field->size; 2250 hist_field->is_signed = field->is_signed; 2251 hist_field->type = kstrdup(field->type, GFP_KERNEL); 2252 if (!hist_field->type) 2253 goto free; 2254 2255 hist_field->fn = select_value_fn(field->size, 2256 field->is_signed); 2257 if (!hist_field->fn) { 2258 destroy_hist_field(hist_field, 0); 2259 return NULL; 2260 } 2261 } 2262 out: 2263 hist_field->field = field; 2264 hist_field->flags = flags; 2265 2266 if (var_name) { 2267 hist_field->var.name = kstrdup(var_name, GFP_KERNEL); 2268 if (!hist_field->var.name) 2269 goto free; 2270 } 2271 2272 return hist_field; 2273 free: 2274 destroy_hist_field(hist_field, 0); 2275 return NULL; 2276 } 2277 2278 static void destroy_hist_fields(struct hist_trigger_data *hist_data) 2279 { 2280 unsigned int i; 2281 2282 for (i = 0; i < HIST_FIELDS_MAX; i++) { 2283 if (hist_data->fields[i]) { 2284 destroy_hist_field(hist_data->fields[i], 0); 2285 hist_data->fields[i] = NULL; 2286 } 2287 } 2288 } 2289 2290 static int init_var_ref(struct hist_field *ref_field, 2291 struct hist_field *var_field, 2292 char *system, char *event_name) 2293 { 2294 int err = 0; 2295 2296 ref_field->var.idx = var_field->var.idx; 2297 ref_field->var.hist_data = var_field->hist_data; 2298 ref_field->size = var_field->size; 2299 ref_field->is_signed = var_field->is_signed; 2300 ref_field->flags |= var_field->flags & 2301 (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS); 2302 2303 if (system) { 2304 ref_field->system = kstrdup(system, GFP_KERNEL); 2305 if (!ref_field->system) 2306 return -ENOMEM; 2307 } 2308 2309 if (event_name) { 2310 ref_field->event_name = kstrdup(event_name, GFP_KERNEL); 2311 if (!ref_field->event_name) { 2312 err = -ENOMEM; 2313 goto free; 2314 } 2315 } 2316 2317 if (var_field->var.name) { 2318 ref_field->name = kstrdup(var_field->var.name, GFP_KERNEL); 2319 if (!ref_field->name) { 2320 err = -ENOMEM; 2321 goto free; 2322 } 2323 } else if (var_field->name) { 2324 ref_field->name = kstrdup(var_field->name, GFP_KERNEL); 2325 if (!ref_field->name) { 2326 err = -ENOMEM; 2327 goto free; 2328 } 2329 } 2330 2331 ref_field->type = kstrdup(var_field->type, GFP_KERNEL); 2332 if (!ref_field->type) { 2333 err = -ENOMEM; 2334 goto free; 2335 } 2336 out: 2337 return err; 2338 free: 2339 kfree(ref_field->system); 2340 kfree(ref_field->event_name); 2341 kfree(ref_field->name); 2342 2343 goto out; 2344 } 2345 2346 static struct hist_field *create_var_ref(struct hist_field *var_field, 2347 char *system, char *event_name) 2348 { 2349 unsigned long flags = HIST_FIELD_FL_VAR_REF; 2350 struct hist_field *ref_field; 2351 2352 ref_field = create_hist_field(var_field->hist_data, NULL, flags, NULL); 2353 if (ref_field) { 2354 if (init_var_ref(ref_field, var_field, system, event_name)) { 2355 destroy_hist_field(ref_field, 0); 2356 return NULL; 2357 } 2358 } 2359 2360 return ref_field; 2361 } 2362 2363 static bool is_var_ref(char *var_name) 2364 { 2365 if (!var_name || strlen(var_name) < 2 || var_name[0] != '$') 2366 return false; 2367 2368 return true; 2369 } 2370 2371 static char *field_name_from_var(struct hist_trigger_data *hist_data, 2372 char *var_name) 2373 { 2374 char *name, *field; 2375 unsigned int i; 2376 2377 for (i = 0; i < hist_data->attrs->var_defs.n_vars; i++) { 2378 name = hist_data->attrs->var_defs.name[i]; 2379 2380 if (strcmp(var_name, name) == 0) { 2381 field = hist_data->attrs->var_defs.expr[i]; 2382 if (contains_operator(field) || is_var_ref(field)) 2383 continue; 2384 return field; 2385 } 2386 } 2387 2388 return NULL; 2389 } 2390 2391 static char *local_field_var_ref(struct hist_trigger_data *hist_data, 2392 char *system, char *event_name, 2393 char *var_name) 2394 { 2395 struct trace_event_call *call; 2396 2397 if (system && event_name) { 2398 call = hist_data->event_file->event_call; 2399 2400 if (strcmp(system, call->class->system) != 0) 2401 return NULL; 2402 2403 if (strcmp(event_name, trace_event_name(call)) != 0) 2404 return NULL; 2405 } 2406 2407 if (!!system != !!event_name) 2408 return NULL; 2409 2410 if (!is_var_ref(var_name)) 2411 return NULL; 2412 2413 var_name++; 2414 2415 return field_name_from_var(hist_data, var_name); 2416 } 2417 2418 static struct hist_field *parse_var_ref(struct hist_trigger_data *hist_data, 2419 char *system, char *event_name, 2420 char *var_name) 2421 { 2422 struct hist_field *var_field = NULL, *ref_field = NULL; 2423 2424 if (!is_var_ref(var_name)) 2425 return NULL; 2426 2427 var_name++; 2428 2429 var_field = find_event_var(hist_data, system, event_name, var_name); 2430 if (var_field) 2431 ref_field = create_var_ref(var_field, system, event_name); 2432 2433 if (!ref_field) 2434 hist_err_event("Couldn't find variable: $", 2435 system, event_name, var_name); 2436 2437 return ref_field; 2438 } 2439 2440 static struct ftrace_event_field * 2441 parse_field(struct hist_trigger_data *hist_data, struct trace_event_file *file, 2442 char *field_str, unsigned long *flags) 2443 { 2444 struct ftrace_event_field *field = NULL; 2445 char *field_name, *modifier, *str; 2446 2447 modifier = str = kstrdup(field_str, GFP_KERNEL); 2448 if (!modifier) 2449 return ERR_PTR(-ENOMEM); 2450 2451 field_name = strsep(&modifier, "."); 2452 if (modifier) { 2453 if (strcmp(modifier, "hex") == 0) 2454 *flags |= HIST_FIELD_FL_HEX; 2455 else if (strcmp(modifier, "sym") == 0) 2456 *flags |= HIST_FIELD_FL_SYM; 2457 else if (strcmp(modifier, "sym-offset") == 0) 2458 *flags |= HIST_FIELD_FL_SYM_OFFSET; 2459 else if ((strcmp(modifier, "execname") == 0) && 2460 (strcmp(field_name, "common_pid") == 0)) 2461 *flags |= HIST_FIELD_FL_EXECNAME; 2462 else if (strcmp(modifier, "syscall") == 0) 2463 *flags |= HIST_FIELD_FL_SYSCALL; 2464 else if (strcmp(modifier, "log2") == 0) 2465 *flags |= HIST_FIELD_FL_LOG2; 2466 else if (strcmp(modifier, "usecs") == 0) 2467 *flags |= HIST_FIELD_FL_TIMESTAMP_USECS; 2468 else { 2469 hist_err("Invalid field modifier: ", modifier); 2470 field = ERR_PTR(-EINVAL); 2471 goto out; 2472 } 2473 } 2474 2475 if (strcmp(field_name, "common_timestamp") == 0) { 2476 *flags |= HIST_FIELD_FL_TIMESTAMP; 2477 hist_data->enable_timestamps = true; 2478 if (*flags & HIST_FIELD_FL_TIMESTAMP_USECS) 2479 hist_data->attrs->ts_in_usecs = true; 2480 } else if (strcmp(field_name, "cpu") == 0) 2481 *flags |= HIST_FIELD_FL_CPU; 2482 else { 2483 field = trace_find_event_field(file->event_call, field_name); 2484 if (!field || !field->size) { 2485 hist_err("Couldn't find field: ", field_name); 2486 field = ERR_PTR(-EINVAL); 2487 goto out; 2488 } 2489 } 2490 out: 2491 kfree(str); 2492 2493 return field; 2494 } 2495 2496 static struct hist_field *create_alias(struct hist_trigger_data *hist_data, 2497 struct hist_field *var_ref, 2498 char *var_name) 2499 { 2500 struct hist_field *alias = NULL; 2501 unsigned long flags = HIST_FIELD_FL_ALIAS | HIST_FIELD_FL_VAR; 2502 2503 alias = create_hist_field(hist_data, NULL, flags, var_name); 2504 if (!alias) 2505 return NULL; 2506 2507 alias->fn = var_ref->fn; 2508 alias->operands[0] = var_ref; 2509 2510 if (init_var_ref(alias, var_ref, var_ref->system, var_ref->event_name)) { 2511 destroy_hist_field(alias, 0); 2512 return NULL; 2513 } 2514 2515 return alias; 2516 } 2517 2518 static struct hist_field *parse_atom(struct hist_trigger_data *hist_data, 2519 struct trace_event_file *file, char *str, 2520 unsigned long *flags, char *var_name) 2521 { 2522 char *s, *ref_system = NULL, *ref_event = NULL, *ref_var = str; 2523 struct ftrace_event_field *field = NULL; 2524 struct hist_field *hist_field = NULL; 2525 int ret = 0; 2526 2527 s = strchr(str, '.'); 2528 if (s) { 2529 s = strchr(++s, '.'); 2530 if (s) { 2531 ref_system = strsep(&str, "."); 2532 if (!str) { 2533 ret = -EINVAL; 2534 goto out; 2535 } 2536 ref_event = strsep(&str, "."); 2537 if (!str) { 2538 ret = -EINVAL; 2539 goto out; 2540 } 2541 ref_var = str; 2542 } 2543 } 2544 2545 s = local_field_var_ref(hist_data, ref_system, ref_event, ref_var); 2546 if (!s) { 2547 hist_field = parse_var_ref(hist_data, ref_system, ref_event, ref_var); 2548 if (hist_field) { 2549 hist_data->var_refs[hist_data->n_var_refs] = hist_field; 2550 hist_field->var_ref_idx = hist_data->n_var_refs++; 2551 if (var_name) { 2552 hist_field = create_alias(hist_data, hist_field, var_name); 2553 if (!hist_field) { 2554 ret = -ENOMEM; 2555 goto out; 2556 } 2557 } 2558 return hist_field; 2559 } 2560 } else 2561 str = s; 2562 2563 field = parse_field(hist_data, file, str, flags); 2564 if (IS_ERR(field)) { 2565 ret = PTR_ERR(field); 2566 goto out; 2567 } 2568 2569 hist_field = create_hist_field(hist_data, field, *flags, var_name); 2570 if (!hist_field) { 2571 ret = -ENOMEM; 2572 goto out; 2573 } 2574 2575 return hist_field; 2576 out: 2577 return ERR_PTR(ret); 2578 } 2579 2580 static struct hist_field *parse_expr(struct hist_trigger_data *hist_data, 2581 struct trace_event_file *file, 2582 char *str, unsigned long flags, 2583 char *var_name, unsigned int level); 2584 2585 static struct hist_field *parse_unary(struct hist_trigger_data *hist_data, 2586 struct trace_event_file *file, 2587 char *str, unsigned long flags, 2588 char *var_name, unsigned int level) 2589 { 2590 struct hist_field *operand1, *expr = NULL; 2591 unsigned long operand_flags; 2592 int ret = 0; 2593 char *s; 2594 2595 /* we support only -(xxx) i.e. explicit parens required */ 2596 2597 if (level > 3) { 2598 hist_err("Too many subexpressions (3 max): ", str); 2599 ret = -EINVAL; 2600 goto free; 2601 } 2602 2603 str++; /* skip leading '-' */ 2604 2605 s = strchr(str, '('); 2606 if (s) 2607 str++; 2608 else { 2609 ret = -EINVAL; 2610 goto free; 2611 } 2612 2613 s = strrchr(str, ')'); 2614 if (s) 2615 *s = '\0'; 2616 else { 2617 ret = -EINVAL; /* no closing ')' */ 2618 goto free; 2619 } 2620 2621 flags |= HIST_FIELD_FL_EXPR; 2622 expr = create_hist_field(hist_data, NULL, flags, var_name); 2623 if (!expr) { 2624 ret = -ENOMEM; 2625 goto free; 2626 } 2627 2628 operand_flags = 0; 2629 operand1 = parse_expr(hist_data, file, str, operand_flags, NULL, ++level); 2630 if (IS_ERR(operand1)) { 2631 ret = PTR_ERR(operand1); 2632 goto free; 2633 } 2634 2635 expr->flags |= operand1->flags & 2636 (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS); 2637 expr->fn = hist_field_unary_minus; 2638 expr->operands[0] = operand1; 2639 expr->operator = FIELD_OP_UNARY_MINUS; 2640 expr->name = expr_str(expr, 0); 2641 expr->type = kstrdup(operand1->type, GFP_KERNEL); 2642 if (!expr->type) { 2643 ret = -ENOMEM; 2644 goto free; 2645 } 2646 2647 return expr; 2648 free: 2649 destroy_hist_field(expr, 0); 2650 return ERR_PTR(ret); 2651 } 2652 2653 static int check_expr_operands(struct hist_field *operand1, 2654 struct hist_field *operand2) 2655 { 2656 unsigned long operand1_flags = operand1->flags; 2657 unsigned long operand2_flags = operand2->flags; 2658 2659 if ((operand1_flags & HIST_FIELD_FL_VAR_REF) || 2660 (operand1_flags & HIST_FIELD_FL_ALIAS)) { 2661 struct hist_field *var; 2662 2663 var = find_var_field(operand1->var.hist_data, operand1->name); 2664 if (!var) 2665 return -EINVAL; 2666 operand1_flags = var->flags; 2667 } 2668 2669 if ((operand2_flags & HIST_FIELD_FL_VAR_REF) || 2670 (operand2_flags & HIST_FIELD_FL_ALIAS)) { 2671 struct hist_field *var; 2672 2673 var = find_var_field(operand2->var.hist_data, operand2->name); 2674 if (!var) 2675 return -EINVAL; 2676 operand2_flags = var->flags; 2677 } 2678 2679 if ((operand1_flags & HIST_FIELD_FL_TIMESTAMP_USECS) != 2680 (operand2_flags & HIST_FIELD_FL_TIMESTAMP_USECS)) { 2681 hist_err("Timestamp units in expression don't match", NULL); 2682 return -EINVAL; 2683 } 2684 2685 return 0; 2686 } 2687 2688 static struct hist_field *parse_expr(struct hist_trigger_data *hist_data, 2689 struct trace_event_file *file, 2690 char *str, unsigned long flags, 2691 char *var_name, unsigned int level) 2692 { 2693 struct hist_field *operand1 = NULL, *operand2 = NULL, *expr = NULL; 2694 unsigned long operand_flags; 2695 int field_op, ret = -EINVAL; 2696 char *sep, *operand1_str; 2697 2698 if (level > 3) { 2699 hist_err("Too many subexpressions (3 max): ", str); 2700 return ERR_PTR(-EINVAL); 2701 } 2702 2703 field_op = contains_operator(str); 2704 2705 if (field_op == FIELD_OP_NONE) 2706 return parse_atom(hist_data, file, str, &flags, var_name); 2707 2708 if (field_op == FIELD_OP_UNARY_MINUS) 2709 return parse_unary(hist_data, file, str, flags, var_name, ++level); 2710 2711 switch (field_op) { 2712 case FIELD_OP_MINUS: 2713 sep = "-"; 2714 break; 2715 case FIELD_OP_PLUS: 2716 sep = "+"; 2717 break; 2718 default: 2719 goto free; 2720 } 2721 2722 operand1_str = strsep(&str, sep); 2723 if (!operand1_str || !str) 2724 goto free; 2725 2726 operand_flags = 0; 2727 operand1 = parse_atom(hist_data, file, operand1_str, 2728 &operand_flags, NULL); 2729 if (IS_ERR(operand1)) { 2730 ret = PTR_ERR(operand1); 2731 operand1 = NULL; 2732 goto free; 2733 } 2734 2735 /* rest of string could be another expression e.g. b+c in a+b+c */ 2736 operand_flags = 0; 2737 operand2 = parse_expr(hist_data, file, str, operand_flags, NULL, ++level); 2738 if (IS_ERR(operand2)) { 2739 ret = PTR_ERR(operand2); 2740 operand2 = NULL; 2741 goto free; 2742 } 2743 2744 ret = check_expr_operands(operand1, operand2); 2745 if (ret) 2746 goto free; 2747 2748 flags |= HIST_FIELD_FL_EXPR; 2749 2750 flags |= operand1->flags & 2751 (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS); 2752 2753 expr = create_hist_field(hist_data, NULL, flags, var_name); 2754 if (!expr) { 2755 ret = -ENOMEM; 2756 goto free; 2757 } 2758 2759 operand1->read_once = true; 2760 operand2->read_once = true; 2761 2762 expr->operands[0] = operand1; 2763 expr->operands[1] = operand2; 2764 expr->operator = field_op; 2765 expr->name = expr_str(expr, 0); 2766 expr->type = kstrdup(operand1->type, GFP_KERNEL); 2767 if (!expr->type) { 2768 ret = -ENOMEM; 2769 goto free; 2770 } 2771 2772 switch (field_op) { 2773 case FIELD_OP_MINUS: 2774 expr->fn = hist_field_minus; 2775 break; 2776 case FIELD_OP_PLUS: 2777 expr->fn = hist_field_plus; 2778 break; 2779 default: 2780 ret = -EINVAL; 2781 goto free; 2782 } 2783 2784 return expr; 2785 free: 2786 destroy_hist_field(operand1, 0); 2787 destroy_hist_field(operand2, 0); 2788 destroy_hist_field(expr, 0); 2789 2790 return ERR_PTR(ret); 2791 } 2792 2793 static char *find_trigger_filter(struct hist_trigger_data *hist_data, 2794 struct trace_event_file *file) 2795 { 2796 struct event_trigger_data *test; 2797 2798 list_for_each_entry_rcu(test, &file->triggers, list) { 2799 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { 2800 if (test->private_data == hist_data) 2801 return test->filter_str; 2802 } 2803 } 2804 2805 return NULL; 2806 } 2807 2808 static struct event_command trigger_hist_cmd; 2809 static int event_hist_trigger_func(struct event_command *cmd_ops, 2810 struct trace_event_file *file, 2811 char *glob, char *cmd, char *param); 2812 2813 static bool compatible_keys(struct hist_trigger_data *target_hist_data, 2814 struct hist_trigger_data *hist_data, 2815 unsigned int n_keys) 2816 { 2817 struct hist_field *target_hist_field, *hist_field; 2818 unsigned int n, i, j; 2819 2820 if (hist_data->n_fields - hist_data->n_vals != n_keys) 2821 return false; 2822 2823 i = hist_data->n_vals; 2824 j = target_hist_data->n_vals; 2825 2826 for (n = 0; n < n_keys; n++) { 2827 hist_field = hist_data->fields[i + n]; 2828 target_hist_field = target_hist_data->fields[j + n]; 2829 2830 if (strcmp(hist_field->type, target_hist_field->type) != 0) 2831 return false; 2832 if (hist_field->size != target_hist_field->size) 2833 return false; 2834 if (hist_field->is_signed != target_hist_field->is_signed) 2835 return false; 2836 } 2837 2838 return true; 2839 } 2840 2841 static struct hist_trigger_data * 2842 find_compatible_hist(struct hist_trigger_data *target_hist_data, 2843 struct trace_event_file *file) 2844 { 2845 struct hist_trigger_data *hist_data; 2846 struct event_trigger_data *test; 2847 unsigned int n_keys; 2848 2849 n_keys = target_hist_data->n_fields - target_hist_data->n_vals; 2850 2851 list_for_each_entry_rcu(test, &file->triggers, list) { 2852 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { 2853 hist_data = test->private_data; 2854 2855 if (compatible_keys(target_hist_data, hist_data, n_keys)) 2856 return hist_data; 2857 } 2858 } 2859 2860 return NULL; 2861 } 2862 2863 static struct trace_event_file *event_file(struct trace_array *tr, 2864 char *system, char *event_name) 2865 { 2866 struct trace_event_file *file; 2867 2868 file = find_event_file(tr, system, event_name); 2869 if (!file) 2870 return ERR_PTR(-EINVAL); 2871 2872 return file; 2873 } 2874 2875 static struct hist_field * 2876 find_synthetic_field_var(struct hist_trigger_data *target_hist_data, 2877 char *system, char *event_name, char *field_name) 2878 { 2879 struct hist_field *event_var; 2880 char *synthetic_name; 2881 2882 synthetic_name = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL); 2883 if (!synthetic_name) 2884 return ERR_PTR(-ENOMEM); 2885 2886 strcpy(synthetic_name, "synthetic_"); 2887 strcat(synthetic_name, field_name); 2888 2889 event_var = find_event_var(target_hist_data, system, event_name, synthetic_name); 2890 2891 kfree(synthetic_name); 2892 2893 return event_var; 2894 } 2895 2896 /** 2897 * create_field_var_hist - Automatically create a histogram and var for a field 2898 * @target_hist_data: The target hist trigger 2899 * @subsys_name: Optional subsystem name 2900 * @event_name: Optional event name 2901 * @field_name: The name of the field (and the resulting variable) 2902 * 2903 * Hist trigger actions fetch data from variables, not directly from 2904 * events. However, for convenience, users are allowed to directly 2905 * specify an event field in an action, which will be automatically 2906 * converted into a variable on their behalf. 2907 2908 * If a user specifies a field on an event that isn't the event the 2909 * histogram currently being defined (the target event histogram), the 2910 * only way that can be accomplished is if a new hist trigger is 2911 * created and the field variable defined on that. 2912 * 2913 * This function creates a new histogram compatible with the target 2914 * event (meaning a histogram with the same key as the target 2915 * histogram), and creates a variable for the specified field, but 2916 * with 'synthetic_' prepended to the variable name in order to avoid 2917 * collision with normal field variables. 2918 * 2919 * Return: The variable created for the field. 2920 */ 2921 static struct hist_field * 2922 create_field_var_hist(struct hist_trigger_data *target_hist_data, 2923 char *subsys_name, char *event_name, char *field_name) 2924 { 2925 struct trace_array *tr = target_hist_data->event_file->tr; 2926 struct hist_field *event_var = ERR_PTR(-EINVAL); 2927 struct hist_trigger_data *hist_data; 2928 unsigned int i, n, first = true; 2929 struct field_var_hist *var_hist; 2930 struct trace_event_file *file; 2931 struct hist_field *key_field; 2932 char *saved_filter; 2933 char *cmd; 2934 int ret; 2935 2936 if (target_hist_data->n_field_var_hists >= SYNTH_FIELDS_MAX) { 2937 hist_err_event("onmatch: Too many field variables defined: ", 2938 subsys_name, event_name, field_name); 2939 return ERR_PTR(-EINVAL); 2940 } 2941 2942 file = event_file(tr, subsys_name, event_name); 2943 2944 if (IS_ERR(file)) { 2945 hist_err_event("onmatch: Event file not found: ", 2946 subsys_name, event_name, field_name); 2947 ret = PTR_ERR(file); 2948 return ERR_PTR(ret); 2949 } 2950 2951 /* 2952 * Look for a histogram compatible with target. We'll use the 2953 * found histogram specification to create a new matching 2954 * histogram with our variable on it. target_hist_data is not 2955 * yet a registered histogram so we can't use that. 2956 */ 2957 hist_data = find_compatible_hist(target_hist_data, file); 2958 if (!hist_data) { 2959 hist_err_event("onmatch: Matching event histogram not found: ", 2960 subsys_name, event_name, field_name); 2961 return ERR_PTR(-EINVAL); 2962 } 2963 2964 /* See if a synthetic field variable has already been created */ 2965 event_var = find_synthetic_field_var(target_hist_data, subsys_name, 2966 event_name, field_name); 2967 if (!IS_ERR_OR_NULL(event_var)) 2968 return event_var; 2969 2970 var_hist = kzalloc(sizeof(*var_hist), GFP_KERNEL); 2971 if (!var_hist) 2972 return ERR_PTR(-ENOMEM); 2973 2974 cmd = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL); 2975 if (!cmd) { 2976 kfree(var_hist); 2977 return ERR_PTR(-ENOMEM); 2978 } 2979 2980 /* Use the same keys as the compatible histogram */ 2981 strcat(cmd, "keys="); 2982 2983 for_each_hist_key_field(i, hist_data) { 2984 key_field = hist_data->fields[i]; 2985 if (!first) 2986 strcat(cmd, ","); 2987 strcat(cmd, key_field->field->name); 2988 first = false; 2989 } 2990 2991 /* Create the synthetic field variable specification */ 2992 strcat(cmd, ":synthetic_"); 2993 strcat(cmd, field_name); 2994 strcat(cmd, "="); 2995 strcat(cmd, field_name); 2996 2997 /* Use the same filter as the compatible histogram */ 2998 saved_filter = find_trigger_filter(hist_data, file); 2999 if (saved_filter) { 3000 strcat(cmd, " if "); 3001 strcat(cmd, saved_filter); 3002 } 3003 3004 var_hist->cmd = kstrdup(cmd, GFP_KERNEL); 3005 if (!var_hist->cmd) { 3006 kfree(cmd); 3007 kfree(var_hist); 3008 return ERR_PTR(-ENOMEM); 3009 } 3010 3011 /* Save the compatible histogram information */ 3012 var_hist->hist_data = hist_data; 3013 3014 /* Create the new histogram with our variable */ 3015 ret = event_hist_trigger_func(&trigger_hist_cmd, file, 3016 "", "hist", cmd); 3017 if (ret) { 3018 kfree(cmd); 3019 kfree(var_hist->cmd); 3020 kfree(var_hist); 3021 hist_err_event("onmatch: Couldn't create histogram for field: ", 3022 subsys_name, event_name, field_name); 3023 return ERR_PTR(ret); 3024 } 3025 3026 kfree(cmd); 3027 3028 /* If we can't find the variable, something went wrong */ 3029 event_var = find_synthetic_field_var(target_hist_data, subsys_name, 3030 event_name, field_name); 3031 if (IS_ERR_OR_NULL(event_var)) { 3032 kfree(var_hist->cmd); 3033 kfree(var_hist); 3034 hist_err_event("onmatch: Couldn't find synthetic variable: ", 3035 subsys_name, event_name, field_name); 3036 return ERR_PTR(-EINVAL); 3037 } 3038 3039 n = target_hist_data->n_field_var_hists; 3040 target_hist_data->field_var_hists[n] = var_hist; 3041 target_hist_data->n_field_var_hists++; 3042 3043 return event_var; 3044 } 3045 3046 static struct hist_field * 3047 find_target_event_var(struct hist_trigger_data *hist_data, 3048 char *subsys_name, char *event_name, char *var_name) 3049 { 3050 struct trace_event_file *file = hist_data->event_file; 3051 struct hist_field *hist_field = NULL; 3052 3053 if (subsys_name) { 3054 struct trace_event_call *call; 3055 3056 if (!event_name) 3057 return NULL; 3058 3059 call = file->event_call; 3060 3061 if (strcmp(subsys_name, call->class->system) != 0) 3062 return NULL; 3063 3064 if (strcmp(event_name, trace_event_name(call)) != 0) 3065 return NULL; 3066 } 3067 3068 hist_field = find_var_field(hist_data, var_name); 3069 3070 return hist_field; 3071 } 3072 3073 static inline void __update_field_vars(struct tracing_map_elt *elt, 3074 struct ring_buffer_event *rbe, 3075 void *rec, 3076 struct field_var **field_vars, 3077 unsigned int n_field_vars, 3078 unsigned int field_var_str_start) 3079 { 3080 struct hist_elt_data *elt_data = elt->private_data; 3081 unsigned int i, j, var_idx; 3082 u64 var_val; 3083 3084 for (i = 0, j = field_var_str_start; i < n_field_vars; i++) { 3085 struct field_var *field_var = field_vars[i]; 3086 struct hist_field *var = field_var->var; 3087 struct hist_field *val = field_var->val; 3088 3089 var_val = val->fn(val, elt, rbe, rec); 3090 var_idx = var->var.idx; 3091 3092 if (val->flags & HIST_FIELD_FL_STRING) { 3093 char *str = elt_data->field_var_str[j++]; 3094 char *val_str = (char *)(uintptr_t)var_val; 3095 3096 strscpy(str, val_str, STR_VAR_LEN_MAX); 3097 var_val = (u64)(uintptr_t)str; 3098 } 3099 tracing_map_set_var(elt, var_idx, var_val); 3100 } 3101 } 3102 3103 static void update_field_vars(struct hist_trigger_data *hist_data, 3104 struct tracing_map_elt *elt, 3105 struct ring_buffer_event *rbe, 3106 void *rec) 3107 { 3108 __update_field_vars(elt, rbe, rec, hist_data->field_vars, 3109 hist_data->n_field_vars, 0); 3110 } 3111 3112 static void update_max_vars(struct hist_trigger_data *hist_data, 3113 struct tracing_map_elt *elt, 3114 struct ring_buffer_event *rbe, 3115 void *rec) 3116 { 3117 __update_field_vars(elt, rbe, rec, hist_data->max_vars, 3118 hist_data->n_max_vars, hist_data->n_field_var_str); 3119 } 3120 3121 static struct hist_field *create_var(struct hist_trigger_data *hist_data, 3122 struct trace_event_file *file, 3123 char *name, int size, const char *type) 3124 { 3125 struct hist_field *var; 3126 int idx; 3127 3128 if (find_var(hist_data, file, name) && !hist_data->remove) { 3129 var = ERR_PTR(-EINVAL); 3130 goto out; 3131 } 3132 3133 var = kzalloc(sizeof(struct hist_field), GFP_KERNEL); 3134 if (!var) { 3135 var = ERR_PTR(-ENOMEM); 3136 goto out; 3137 } 3138 3139 idx = tracing_map_add_var(hist_data->map); 3140 if (idx < 0) { 3141 kfree(var); 3142 var = ERR_PTR(-EINVAL); 3143 goto out; 3144 } 3145 3146 var->flags = HIST_FIELD_FL_VAR; 3147 var->var.idx = idx; 3148 var->var.hist_data = var->hist_data = hist_data; 3149 var->size = size; 3150 var->var.name = kstrdup(name, GFP_KERNEL); 3151 var->type = kstrdup(type, GFP_KERNEL); 3152 if (!var->var.name || !var->type) { 3153 kfree(var->var.name); 3154 kfree(var->type); 3155 kfree(var); 3156 var = ERR_PTR(-ENOMEM); 3157 } 3158 out: 3159 return var; 3160 } 3161 3162 static struct field_var *create_field_var(struct hist_trigger_data *hist_data, 3163 struct trace_event_file *file, 3164 char *field_name) 3165 { 3166 struct hist_field *val = NULL, *var = NULL; 3167 unsigned long flags = HIST_FIELD_FL_VAR; 3168 struct field_var *field_var; 3169 int ret = 0; 3170 3171 if (hist_data->n_field_vars >= SYNTH_FIELDS_MAX) { 3172 hist_err("Too many field variables defined: ", field_name); 3173 ret = -EINVAL; 3174 goto err; 3175 } 3176 3177 val = parse_atom(hist_data, file, field_name, &flags, NULL); 3178 if (IS_ERR(val)) { 3179 hist_err("Couldn't parse field variable: ", field_name); 3180 ret = PTR_ERR(val); 3181 goto err; 3182 } 3183 3184 var = create_var(hist_data, file, field_name, val->size, val->type); 3185 if (IS_ERR(var)) { 3186 hist_err("Couldn't create or find variable: ", field_name); 3187 kfree(val); 3188 ret = PTR_ERR(var); 3189 goto err; 3190 } 3191 3192 field_var = kzalloc(sizeof(struct field_var), GFP_KERNEL); 3193 if (!field_var) { 3194 kfree(val); 3195 kfree(var); 3196 ret = -ENOMEM; 3197 goto err; 3198 } 3199 3200 field_var->var = var; 3201 field_var->val = val; 3202 out: 3203 return field_var; 3204 err: 3205 field_var = ERR_PTR(ret); 3206 goto out; 3207 } 3208 3209 /** 3210 * create_target_field_var - Automatically create a variable for a field 3211 * @target_hist_data: The target hist trigger 3212 * @subsys_name: Optional subsystem name 3213 * @event_name: Optional event name 3214 * @var_name: The name of the field (and the resulting variable) 3215 * 3216 * Hist trigger actions fetch data from variables, not directly from 3217 * events. However, for convenience, users are allowed to directly 3218 * specify an event field in an action, which will be automatically 3219 * converted into a variable on their behalf. 3220 3221 * This function creates a field variable with the name var_name on 3222 * the hist trigger currently being defined on the target event. If 3223 * subsys_name and event_name are specified, this function simply 3224 * verifies that they do in fact match the target event subsystem and 3225 * event name. 3226 * 3227 * Return: The variable created for the field. 3228 */ 3229 static struct field_var * 3230 create_target_field_var(struct hist_trigger_data *target_hist_data, 3231 char *subsys_name, char *event_name, char *var_name) 3232 { 3233 struct trace_event_file *file = target_hist_data->event_file; 3234 3235 if (subsys_name) { 3236 struct trace_event_call *call; 3237 3238 if (!event_name) 3239 return NULL; 3240 3241 call = file->event_call; 3242 3243 if (strcmp(subsys_name, call->class->system) != 0) 3244 return NULL; 3245 3246 if (strcmp(event_name, trace_event_name(call)) != 0) 3247 return NULL; 3248 } 3249 3250 return create_field_var(target_hist_data, file, var_name); 3251 } 3252 3253 static void onmax_print(struct seq_file *m, 3254 struct hist_trigger_data *hist_data, 3255 struct tracing_map_elt *elt, 3256 struct action_data *data) 3257 { 3258 unsigned int i, save_var_idx, max_idx = data->onmax.max_var->var.idx; 3259 3260 seq_printf(m, "\n\tmax: %10llu", tracing_map_read_var(elt, max_idx)); 3261 3262 for (i = 0; i < hist_data->n_max_vars; i++) { 3263 struct hist_field *save_val = hist_data->max_vars[i]->val; 3264 struct hist_field *save_var = hist_data->max_vars[i]->var; 3265 u64 val; 3266 3267 save_var_idx = save_var->var.idx; 3268 3269 val = tracing_map_read_var(elt, save_var_idx); 3270 3271 if (save_val->flags & HIST_FIELD_FL_STRING) { 3272 seq_printf(m, " %s: %-32s", save_var->var.name, 3273 (char *)(uintptr_t)(val)); 3274 } else 3275 seq_printf(m, " %s: %10llu", save_var->var.name, val); 3276 } 3277 } 3278 3279 static void onmax_save(struct hist_trigger_data *hist_data, 3280 struct tracing_map_elt *elt, void *rec, 3281 struct ring_buffer_event *rbe, 3282 struct action_data *data, u64 *var_ref_vals) 3283 { 3284 unsigned int max_idx = data->onmax.max_var->var.idx; 3285 unsigned int max_var_ref_idx = data->onmax.max_var_ref_idx; 3286 3287 u64 var_val, max_val; 3288 3289 var_val = var_ref_vals[max_var_ref_idx]; 3290 max_val = tracing_map_read_var(elt, max_idx); 3291 3292 if (var_val <= max_val) 3293 return; 3294 3295 tracing_map_set_var(elt, max_idx, var_val); 3296 3297 update_max_vars(hist_data, elt, rbe, rec); 3298 } 3299 3300 static void onmax_destroy(struct action_data *data) 3301 { 3302 unsigned int i; 3303 3304 destroy_hist_field(data->onmax.max_var, 0); 3305 destroy_hist_field(data->onmax.var, 0); 3306 3307 kfree(data->onmax.var_str); 3308 kfree(data->onmax.fn_name); 3309 3310 for (i = 0; i < data->n_params; i++) 3311 kfree(data->params[i]); 3312 3313 kfree(data); 3314 } 3315 3316 static int onmax_create(struct hist_trigger_data *hist_data, 3317 struct action_data *data) 3318 { 3319 struct trace_event_file *file = hist_data->event_file; 3320 struct hist_field *var_field, *ref_field, *max_var; 3321 unsigned int var_ref_idx = hist_data->n_var_refs; 3322 struct field_var *field_var; 3323 char *onmax_var_str, *param; 3324 unsigned long flags; 3325 unsigned int i; 3326 int ret = 0; 3327 3328 onmax_var_str = data->onmax.var_str; 3329 if (onmax_var_str[0] != '$') { 3330 hist_err("onmax: For onmax(x), x must be a variable: ", onmax_var_str); 3331 return -EINVAL; 3332 } 3333 onmax_var_str++; 3334 3335 var_field = find_target_event_var(hist_data, NULL, NULL, onmax_var_str); 3336 if (!var_field) { 3337 hist_err("onmax: Couldn't find onmax variable: ", onmax_var_str); 3338 return -EINVAL; 3339 } 3340 3341 flags = HIST_FIELD_FL_VAR_REF; 3342 ref_field = create_hist_field(hist_data, NULL, flags, NULL); 3343 if (!ref_field) 3344 return -ENOMEM; 3345 3346 if (init_var_ref(ref_field, var_field, NULL, NULL)) { 3347 destroy_hist_field(ref_field, 0); 3348 ret = -ENOMEM; 3349 goto out; 3350 } 3351 hist_data->var_refs[hist_data->n_var_refs] = ref_field; 3352 ref_field->var_ref_idx = hist_data->n_var_refs++; 3353 data->onmax.var = ref_field; 3354 3355 data->fn = onmax_save; 3356 data->onmax.max_var_ref_idx = var_ref_idx; 3357 max_var = create_var(hist_data, file, "max", sizeof(u64), "u64"); 3358 if (IS_ERR(max_var)) { 3359 hist_err("onmax: Couldn't create onmax variable: ", "max"); 3360 ret = PTR_ERR(max_var); 3361 goto out; 3362 } 3363 data->onmax.max_var = max_var; 3364 3365 for (i = 0; i < data->n_params; i++) { 3366 param = kstrdup(data->params[i], GFP_KERNEL); 3367 if (!param) { 3368 ret = -ENOMEM; 3369 goto out; 3370 } 3371 3372 field_var = create_target_field_var(hist_data, NULL, NULL, param); 3373 if (IS_ERR(field_var)) { 3374 hist_err("onmax: Couldn't create field variable: ", param); 3375 ret = PTR_ERR(field_var); 3376 kfree(param); 3377 goto out; 3378 } 3379 3380 hist_data->max_vars[hist_data->n_max_vars++] = field_var; 3381 if (field_var->val->flags & HIST_FIELD_FL_STRING) 3382 hist_data->n_max_var_str++; 3383 3384 kfree(param); 3385 } 3386 out: 3387 return ret; 3388 } 3389 3390 static int parse_action_params(char *params, struct action_data *data) 3391 { 3392 char *param, *saved_param; 3393 int ret = 0; 3394 3395 while (params) { 3396 if (data->n_params >= SYNTH_FIELDS_MAX) 3397 goto out; 3398 3399 param = strsep(¶ms, ","); 3400 if (!param) { 3401 ret = -EINVAL; 3402 goto out; 3403 } 3404 3405 param = strstrip(param); 3406 if (strlen(param) < 2) { 3407 hist_err("Invalid action param: ", param); 3408 ret = -EINVAL; 3409 goto out; 3410 } 3411 3412 saved_param = kstrdup(param, GFP_KERNEL); 3413 if (!saved_param) { 3414 ret = -ENOMEM; 3415 goto out; 3416 } 3417 3418 data->params[data->n_params++] = saved_param; 3419 } 3420 out: 3421 return ret; 3422 } 3423 3424 static struct action_data *onmax_parse(char *str) 3425 { 3426 char *onmax_fn_name, *onmax_var_str; 3427 struct action_data *data; 3428 int ret = -EINVAL; 3429 3430 data = kzalloc(sizeof(*data), GFP_KERNEL); 3431 if (!data) 3432 return ERR_PTR(-ENOMEM); 3433 3434 onmax_var_str = strsep(&str, ")"); 3435 if (!onmax_var_str || !str) { 3436 ret = -EINVAL; 3437 goto free; 3438 } 3439 3440 data->onmax.var_str = kstrdup(onmax_var_str, GFP_KERNEL); 3441 if (!data->onmax.var_str) { 3442 ret = -ENOMEM; 3443 goto free; 3444 } 3445 3446 strsep(&str, "."); 3447 if (!str) 3448 goto free; 3449 3450 onmax_fn_name = strsep(&str, "("); 3451 if (!onmax_fn_name || !str) 3452 goto free; 3453 3454 if (strncmp(onmax_fn_name, "save", strlen("save")) == 0) { 3455 char *params = strsep(&str, ")"); 3456 3457 if (!params) { 3458 ret = -EINVAL; 3459 goto free; 3460 } 3461 3462 ret = parse_action_params(params, data); 3463 if (ret) 3464 goto free; 3465 } else 3466 goto free; 3467 3468 data->onmax.fn_name = kstrdup(onmax_fn_name, GFP_KERNEL); 3469 if (!data->onmax.fn_name) { 3470 ret = -ENOMEM; 3471 goto free; 3472 } 3473 out: 3474 return data; 3475 free: 3476 onmax_destroy(data); 3477 data = ERR_PTR(ret); 3478 goto out; 3479 } 3480 3481 static void onmatch_destroy(struct action_data *data) 3482 { 3483 unsigned int i; 3484 3485 mutex_lock(&synth_event_mutex); 3486 3487 kfree(data->onmatch.match_event); 3488 kfree(data->onmatch.match_event_system); 3489 kfree(data->onmatch.synth_event_name); 3490 3491 for (i = 0; i < data->n_params; i++) 3492 kfree(data->params[i]); 3493 3494 if (data->onmatch.synth_event) 3495 data->onmatch.synth_event->ref--; 3496 3497 kfree(data); 3498 3499 mutex_unlock(&synth_event_mutex); 3500 } 3501 3502 static void destroy_field_var(struct field_var *field_var) 3503 { 3504 if (!field_var) 3505 return; 3506 3507 destroy_hist_field(field_var->var, 0); 3508 destroy_hist_field(field_var->val, 0); 3509 3510 kfree(field_var); 3511 } 3512 3513 static void destroy_field_vars(struct hist_trigger_data *hist_data) 3514 { 3515 unsigned int i; 3516 3517 for (i = 0; i < hist_data->n_field_vars; i++) 3518 destroy_field_var(hist_data->field_vars[i]); 3519 } 3520 3521 static void save_field_var(struct hist_trigger_data *hist_data, 3522 struct field_var *field_var) 3523 { 3524 hist_data->field_vars[hist_data->n_field_vars++] = field_var; 3525 3526 if (field_var->val->flags & HIST_FIELD_FL_STRING) 3527 hist_data->n_field_var_str++; 3528 } 3529 3530 3531 static void destroy_synth_var_refs(struct hist_trigger_data *hist_data) 3532 { 3533 unsigned int i; 3534 3535 for (i = 0; i < hist_data->n_synth_var_refs; i++) 3536 destroy_hist_field(hist_data->synth_var_refs[i], 0); 3537 } 3538 3539 static void save_synth_var_ref(struct hist_trigger_data *hist_data, 3540 struct hist_field *var_ref) 3541 { 3542 hist_data->synth_var_refs[hist_data->n_synth_var_refs++] = var_ref; 3543 3544 hist_data->var_refs[hist_data->n_var_refs] = var_ref; 3545 var_ref->var_ref_idx = hist_data->n_var_refs++; 3546 } 3547 3548 static int check_synth_field(struct synth_event *event, 3549 struct hist_field *hist_field, 3550 unsigned int field_pos) 3551 { 3552 struct synth_field *field; 3553 3554 if (field_pos >= event->n_fields) 3555 return -EINVAL; 3556 3557 field = event->fields[field_pos]; 3558 3559 if (strcmp(field->type, hist_field->type) != 0) 3560 return -EINVAL; 3561 3562 return 0; 3563 } 3564 3565 static struct hist_field * 3566 onmatch_find_var(struct hist_trigger_data *hist_data, struct action_data *data, 3567 char *system, char *event, char *var) 3568 { 3569 struct hist_field *hist_field; 3570 3571 var++; /* skip '$' */ 3572 3573 hist_field = find_target_event_var(hist_data, system, event, var); 3574 if (!hist_field) { 3575 if (!system) { 3576 system = data->onmatch.match_event_system; 3577 event = data->onmatch.match_event; 3578 } 3579 3580 hist_field = find_event_var(hist_data, system, event, var); 3581 } 3582 3583 if (!hist_field) 3584 hist_err_event("onmatch: Couldn't find onmatch param: $", system, event, var); 3585 3586 return hist_field; 3587 } 3588 3589 static struct hist_field * 3590 onmatch_create_field_var(struct hist_trigger_data *hist_data, 3591 struct action_data *data, char *system, 3592 char *event, char *var) 3593 { 3594 struct hist_field *hist_field = NULL; 3595 struct field_var *field_var; 3596 3597 /* 3598 * First try to create a field var on the target event (the 3599 * currently being defined). This will create a variable for 3600 * unqualified fields on the target event, or if qualified, 3601 * target fields that have qualified names matching the target. 3602 */ 3603 field_var = create_target_field_var(hist_data, system, event, var); 3604 3605 if (field_var && !IS_ERR(field_var)) { 3606 save_field_var(hist_data, field_var); 3607 hist_field = field_var->var; 3608 } else { 3609 field_var = NULL; 3610 /* 3611 * If no explicit system.event is specfied, default to 3612 * looking for fields on the onmatch(system.event.xxx) 3613 * event. 3614 */ 3615 if (!system) { 3616 system = data->onmatch.match_event_system; 3617 event = data->onmatch.match_event; 3618 } 3619 3620 /* 3621 * At this point, we're looking at a field on another 3622 * event. Because we can't modify a hist trigger on 3623 * another event to add a variable for a field, we need 3624 * to create a new trigger on that event and create the 3625 * variable at the same time. 3626 */ 3627 hist_field = create_field_var_hist(hist_data, system, event, var); 3628 if (IS_ERR(hist_field)) 3629 goto free; 3630 } 3631 out: 3632 return hist_field; 3633 free: 3634 destroy_field_var(field_var); 3635 hist_field = NULL; 3636 goto out; 3637 } 3638 3639 static int onmatch_create(struct hist_trigger_data *hist_data, 3640 struct trace_event_file *file, 3641 struct action_data *data) 3642 { 3643 char *event_name, *param, *system = NULL; 3644 struct hist_field *hist_field, *var_ref; 3645 unsigned int i, var_ref_idx; 3646 unsigned int field_pos = 0; 3647 struct synth_event *event; 3648 int ret = 0; 3649 3650 mutex_lock(&synth_event_mutex); 3651 event = find_synth_event(data->onmatch.synth_event_name); 3652 if (!event) { 3653 hist_err("onmatch: Couldn't find synthetic event: ", data->onmatch.synth_event_name); 3654 mutex_unlock(&synth_event_mutex); 3655 return -EINVAL; 3656 } 3657 event->ref++; 3658 mutex_unlock(&synth_event_mutex); 3659 3660 var_ref_idx = hist_data->n_var_refs; 3661 3662 for (i = 0; i < data->n_params; i++) { 3663 char *p; 3664 3665 p = param = kstrdup(data->params[i], GFP_KERNEL); 3666 if (!param) { 3667 ret = -ENOMEM; 3668 goto err; 3669 } 3670 3671 system = strsep(¶m, "."); 3672 if (!param) { 3673 param = (char *)system; 3674 system = event_name = NULL; 3675 } else { 3676 event_name = strsep(¶m, "."); 3677 if (!param) { 3678 kfree(p); 3679 ret = -EINVAL; 3680 goto err; 3681 } 3682 } 3683 3684 if (param[0] == '$') 3685 hist_field = onmatch_find_var(hist_data, data, system, 3686 event_name, param); 3687 else 3688 hist_field = onmatch_create_field_var(hist_data, data, 3689 system, 3690 event_name, 3691 param); 3692 3693 if (!hist_field) { 3694 kfree(p); 3695 ret = -EINVAL; 3696 goto err; 3697 } 3698 3699 if (check_synth_field(event, hist_field, field_pos) == 0) { 3700 var_ref = create_var_ref(hist_field, system, event_name); 3701 if (!var_ref) { 3702 kfree(p); 3703 ret = -ENOMEM; 3704 goto err; 3705 } 3706 3707 save_synth_var_ref(hist_data, var_ref); 3708 field_pos++; 3709 kfree(p); 3710 continue; 3711 } 3712 3713 hist_err_event("onmatch: Param type doesn't match synthetic event field type: ", 3714 system, event_name, param); 3715 kfree(p); 3716 ret = -EINVAL; 3717 goto err; 3718 } 3719 3720 if (field_pos != event->n_fields) { 3721 hist_err("onmatch: Param count doesn't match synthetic event field count: ", event->name); 3722 ret = -EINVAL; 3723 goto err; 3724 } 3725 3726 data->fn = action_trace; 3727 data->onmatch.synth_event = event; 3728 data->onmatch.var_ref_idx = var_ref_idx; 3729 out: 3730 return ret; 3731 err: 3732 mutex_lock(&synth_event_mutex); 3733 event->ref--; 3734 mutex_unlock(&synth_event_mutex); 3735 3736 goto out; 3737 } 3738 3739 static struct action_data *onmatch_parse(struct trace_array *tr, char *str) 3740 { 3741 char *match_event, *match_event_system; 3742 char *synth_event_name, *params; 3743 struct action_data *data; 3744 int ret = -EINVAL; 3745 3746 data = kzalloc(sizeof(*data), GFP_KERNEL); 3747 if (!data) 3748 return ERR_PTR(-ENOMEM); 3749 3750 match_event = strsep(&str, ")"); 3751 if (!match_event || !str) { 3752 hist_err("onmatch: Missing closing paren: ", match_event); 3753 goto free; 3754 } 3755 3756 match_event_system = strsep(&match_event, "."); 3757 if (!match_event) { 3758 hist_err("onmatch: Missing subsystem for match event: ", match_event_system); 3759 goto free; 3760 } 3761 3762 if (IS_ERR(event_file(tr, match_event_system, match_event))) { 3763 hist_err_event("onmatch: Invalid subsystem or event name: ", 3764 match_event_system, match_event, NULL); 3765 goto free; 3766 } 3767 3768 data->onmatch.match_event = kstrdup(match_event, GFP_KERNEL); 3769 if (!data->onmatch.match_event) { 3770 ret = -ENOMEM; 3771 goto free; 3772 } 3773 3774 data->onmatch.match_event_system = kstrdup(match_event_system, GFP_KERNEL); 3775 if (!data->onmatch.match_event_system) { 3776 ret = -ENOMEM; 3777 goto free; 3778 } 3779 3780 strsep(&str, "."); 3781 if (!str) { 3782 hist_err("onmatch: Missing . after onmatch(): ", str); 3783 goto free; 3784 } 3785 3786 synth_event_name = strsep(&str, "("); 3787 if (!synth_event_name || !str) { 3788 hist_err("onmatch: Missing opening paramlist paren: ", synth_event_name); 3789 goto free; 3790 } 3791 3792 data->onmatch.synth_event_name = kstrdup(synth_event_name, GFP_KERNEL); 3793 if (!data->onmatch.synth_event_name) { 3794 ret = -ENOMEM; 3795 goto free; 3796 } 3797 3798 params = strsep(&str, ")"); 3799 if (!params || !str || (str && strlen(str))) { 3800 hist_err("onmatch: Missing closing paramlist paren: ", params); 3801 goto free; 3802 } 3803 3804 ret = parse_action_params(params, data); 3805 if (ret) 3806 goto free; 3807 out: 3808 return data; 3809 free: 3810 onmatch_destroy(data); 3811 data = ERR_PTR(ret); 3812 goto out; 3813 } 3814 3815 static int create_hitcount_val(struct hist_trigger_data *hist_data) 3816 { 3817 hist_data->fields[HITCOUNT_IDX] = 3818 create_hist_field(hist_data, NULL, HIST_FIELD_FL_HITCOUNT, NULL); 3819 if (!hist_data->fields[HITCOUNT_IDX]) 3820 return -ENOMEM; 3821 3822 hist_data->n_vals++; 3823 hist_data->n_fields++; 3824 3825 if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX)) 3826 return -EINVAL; 3827 3828 return 0; 3829 } 3830 3831 static int __create_val_field(struct hist_trigger_data *hist_data, 3832 unsigned int val_idx, 3833 struct trace_event_file *file, 3834 char *var_name, char *field_str, 3835 unsigned long flags) 3836 { 3837 struct hist_field *hist_field; 3838 int ret = 0; 3839 3840 hist_field = parse_expr(hist_data, file, field_str, flags, var_name, 0); 3841 if (IS_ERR(hist_field)) { 3842 ret = PTR_ERR(hist_field); 3843 goto out; 3844 } 3845 3846 hist_data->fields[val_idx] = hist_field; 3847 3848 ++hist_data->n_vals; 3849 ++hist_data->n_fields; 3850 3851 if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX + TRACING_MAP_VARS_MAX)) 3852 ret = -EINVAL; 3853 out: 3854 return ret; 3855 } 3856 3857 static int create_val_field(struct hist_trigger_data *hist_data, 3858 unsigned int val_idx, 3859 struct trace_event_file *file, 3860 char *field_str) 3861 { 3862 if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX)) 3863 return -EINVAL; 3864 3865 return __create_val_field(hist_data, val_idx, file, NULL, field_str, 0); 3866 } 3867 3868 static int create_var_field(struct hist_trigger_data *hist_data, 3869 unsigned int val_idx, 3870 struct trace_event_file *file, 3871 char *var_name, char *expr_str) 3872 { 3873 unsigned long flags = 0; 3874 3875 if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX + TRACING_MAP_VARS_MAX)) 3876 return -EINVAL; 3877 3878 if (find_var(hist_data, file, var_name) && !hist_data->remove) { 3879 hist_err("Variable already defined: ", var_name); 3880 return -EINVAL; 3881 } 3882 3883 flags |= HIST_FIELD_FL_VAR; 3884 hist_data->n_vars++; 3885 if (WARN_ON(hist_data->n_vars > TRACING_MAP_VARS_MAX)) 3886 return -EINVAL; 3887 3888 return __create_val_field(hist_data, val_idx, file, var_name, expr_str, flags); 3889 } 3890 3891 static int create_val_fields(struct hist_trigger_data *hist_data, 3892 struct trace_event_file *file) 3893 { 3894 char *fields_str, *field_str; 3895 unsigned int i, j = 1; 3896 int ret; 3897 3898 ret = create_hitcount_val(hist_data); 3899 if (ret) 3900 goto out; 3901 3902 fields_str = hist_data->attrs->vals_str; 3903 if (!fields_str) 3904 goto out; 3905 3906 strsep(&fields_str, "="); 3907 if (!fields_str) 3908 goto out; 3909 3910 for (i = 0, j = 1; i < TRACING_MAP_VALS_MAX && 3911 j < TRACING_MAP_VALS_MAX; i++) { 3912 field_str = strsep(&fields_str, ","); 3913 if (!field_str) 3914 break; 3915 3916 if (strcmp(field_str, "hitcount") == 0) 3917 continue; 3918 3919 ret = create_val_field(hist_data, j++, file, field_str); 3920 if (ret) 3921 goto out; 3922 } 3923 3924 if (fields_str && (strcmp(fields_str, "hitcount") != 0)) 3925 ret = -EINVAL; 3926 out: 3927 return ret; 3928 } 3929 3930 static int create_key_field(struct hist_trigger_data *hist_data, 3931 unsigned int key_idx, 3932 unsigned int key_offset, 3933 struct trace_event_file *file, 3934 char *field_str) 3935 { 3936 struct hist_field *hist_field = NULL; 3937 3938 unsigned long flags = 0; 3939 unsigned int key_size; 3940 int ret = 0; 3941 3942 if (WARN_ON(key_idx >= HIST_FIELDS_MAX)) 3943 return -EINVAL; 3944 3945 flags |= HIST_FIELD_FL_KEY; 3946 3947 if (strcmp(field_str, "stacktrace") == 0) { 3948 flags |= HIST_FIELD_FL_STACKTRACE; 3949 key_size = sizeof(unsigned long) * HIST_STACKTRACE_DEPTH; 3950 hist_field = create_hist_field(hist_data, NULL, flags, NULL); 3951 } else { 3952 hist_field = parse_expr(hist_data, file, field_str, flags, 3953 NULL, 0); 3954 if (IS_ERR(hist_field)) { 3955 ret = PTR_ERR(hist_field); 3956 goto out; 3957 } 3958 3959 if (hist_field->flags & HIST_FIELD_FL_VAR_REF) { 3960 hist_err("Using variable references as keys not supported: ", field_str); 3961 destroy_hist_field(hist_field, 0); 3962 ret = -EINVAL; 3963 goto out; 3964 } 3965 3966 key_size = hist_field->size; 3967 } 3968 3969 hist_data->fields[key_idx] = hist_field; 3970 3971 key_size = ALIGN(key_size, sizeof(u64)); 3972 hist_data->fields[key_idx]->size = key_size; 3973 hist_data->fields[key_idx]->offset = key_offset; 3974 3975 hist_data->key_size += key_size; 3976 3977 if (hist_data->key_size > HIST_KEY_SIZE_MAX) { 3978 ret = -EINVAL; 3979 goto out; 3980 } 3981 3982 hist_data->n_keys++; 3983 hist_data->n_fields++; 3984 3985 if (WARN_ON(hist_data->n_keys > TRACING_MAP_KEYS_MAX)) 3986 return -EINVAL; 3987 3988 ret = key_size; 3989 out: 3990 return ret; 3991 } 3992 3993 static int create_key_fields(struct hist_trigger_data *hist_data, 3994 struct trace_event_file *file) 3995 { 3996 unsigned int i, key_offset = 0, n_vals = hist_data->n_vals; 3997 char *fields_str, *field_str; 3998 int ret = -EINVAL; 3999 4000 fields_str = hist_data->attrs->keys_str; 4001 if (!fields_str) 4002 goto out; 4003 4004 strsep(&fields_str, "="); 4005 if (!fields_str) 4006 goto out; 4007 4008 for (i = n_vals; i < n_vals + TRACING_MAP_KEYS_MAX; i++) { 4009 field_str = strsep(&fields_str, ","); 4010 if (!field_str) 4011 break; 4012 ret = create_key_field(hist_data, i, key_offset, 4013 file, field_str); 4014 if (ret < 0) 4015 goto out; 4016 key_offset += ret; 4017 } 4018 if (fields_str) { 4019 ret = -EINVAL; 4020 goto out; 4021 } 4022 ret = 0; 4023 out: 4024 return ret; 4025 } 4026 4027 static int create_var_fields(struct hist_trigger_data *hist_data, 4028 struct trace_event_file *file) 4029 { 4030 unsigned int i, j = hist_data->n_vals; 4031 int ret = 0; 4032 4033 unsigned int n_vars = hist_data->attrs->var_defs.n_vars; 4034 4035 for (i = 0; i < n_vars; i++) { 4036 char *var_name = hist_data->attrs->var_defs.name[i]; 4037 char *expr = hist_data->attrs->var_defs.expr[i]; 4038 4039 ret = create_var_field(hist_data, j++, file, var_name, expr); 4040 if (ret) 4041 goto out; 4042 } 4043 out: 4044 return ret; 4045 } 4046 4047 static void free_var_defs(struct hist_trigger_data *hist_data) 4048 { 4049 unsigned int i; 4050 4051 for (i = 0; i < hist_data->attrs->var_defs.n_vars; i++) { 4052 kfree(hist_data->attrs->var_defs.name[i]); 4053 kfree(hist_data->attrs->var_defs.expr[i]); 4054 } 4055 4056 hist_data->attrs->var_defs.n_vars = 0; 4057 } 4058 4059 static int parse_var_defs(struct hist_trigger_data *hist_data) 4060 { 4061 char *s, *str, *var_name, *field_str; 4062 unsigned int i, j, n_vars = 0; 4063 int ret = 0; 4064 4065 for (i = 0; i < hist_data->attrs->n_assignments; i++) { 4066 str = hist_data->attrs->assignment_str[i]; 4067 for (j = 0; j < TRACING_MAP_VARS_MAX; j++) { 4068 field_str = strsep(&str, ","); 4069 if (!field_str) 4070 break; 4071 4072 var_name = strsep(&field_str, "="); 4073 if (!var_name || !field_str) { 4074 hist_err("Malformed assignment: ", var_name); 4075 ret = -EINVAL; 4076 goto free; 4077 } 4078 4079 if (n_vars == TRACING_MAP_VARS_MAX) { 4080 hist_err("Too many variables defined: ", var_name); 4081 ret = -EINVAL; 4082 goto free; 4083 } 4084 4085 s = kstrdup(var_name, GFP_KERNEL); 4086 if (!s) { 4087 ret = -ENOMEM; 4088 goto free; 4089 } 4090 hist_data->attrs->var_defs.name[n_vars] = s; 4091 4092 s = kstrdup(field_str, GFP_KERNEL); 4093 if (!s) { 4094 kfree(hist_data->attrs->var_defs.name[n_vars]); 4095 ret = -ENOMEM; 4096 goto free; 4097 } 4098 hist_data->attrs->var_defs.expr[n_vars++] = s; 4099 4100 hist_data->attrs->var_defs.n_vars = n_vars; 4101 } 4102 } 4103 4104 return ret; 4105 free: 4106 free_var_defs(hist_data); 4107 4108 return ret; 4109 } 4110 4111 static int create_hist_fields(struct hist_trigger_data *hist_data, 4112 struct trace_event_file *file) 4113 { 4114 int ret; 4115 4116 ret = parse_var_defs(hist_data); 4117 if (ret) 4118 goto out; 4119 4120 ret = create_val_fields(hist_data, file); 4121 if (ret) 4122 goto out; 4123 4124 ret = create_var_fields(hist_data, file); 4125 if (ret) 4126 goto out; 4127 4128 ret = create_key_fields(hist_data, file); 4129 if (ret) 4130 goto out; 4131 out: 4132 free_var_defs(hist_data); 4133 4134 return ret; 4135 } 4136 4137 static int is_descending(const char *str) 4138 { 4139 if (!str) 4140 return 0; 4141 4142 if (strcmp(str, "descending") == 0) 4143 return 1; 4144 4145 if (strcmp(str, "ascending") == 0) 4146 return 0; 4147 4148 return -EINVAL; 4149 } 4150 4151 static int create_sort_keys(struct hist_trigger_data *hist_data) 4152 { 4153 char *fields_str = hist_data->attrs->sort_key_str; 4154 struct tracing_map_sort_key *sort_key; 4155 int descending, ret = 0; 4156 unsigned int i, j, k; 4157 4158 hist_data->n_sort_keys = 1; /* we always have at least one, hitcount */ 4159 4160 if (!fields_str) 4161 goto out; 4162 4163 strsep(&fields_str, "="); 4164 if (!fields_str) { 4165 ret = -EINVAL; 4166 goto out; 4167 } 4168 4169 for (i = 0; i < TRACING_MAP_SORT_KEYS_MAX; i++) { 4170 struct hist_field *hist_field; 4171 char *field_str, *field_name; 4172 const char *test_name; 4173 4174 sort_key = &hist_data->sort_keys[i]; 4175 4176 field_str = strsep(&fields_str, ","); 4177 if (!field_str) { 4178 if (i == 0) 4179 ret = -EINVAL; 4180 break; 4181 } 4182 4183 if ((i == TRACING_MAP_SORT_KEYS_MAX - 1) && fields_str) { 4184 ret = -EINVAL; 4185 break; 4186 } 4187 4188 field_name = strsep(&field_str, "."); 4189 if (!field_name) { 4190 ret = -EINVAL; 4191 break; 4192 } 4193 4194 if (strcmp(field_name, "hitcount") == 0) { 4195 descending = is_descending(field_str); 4196 if (descending < 0) { 4197 ret = descending; 4198 break; 4199 } 4200 sort_key->descending = descending; 4201 continue; 4202 } 4203 4204 for (j = 1, k = 1; j < hist_data->n_fields; j++) { 4205 unsigned int idx; 4206 4207 hist_field = hist_data->fields[j]; 4208 if (hist_field->flags & HIST_FIELD_FL_VAR) 4209 continue; 4210 4211 idx = k++; 4212 4213 test_name = hist_field_name(hist_field, 0); 4214 4215 if (strcmp(field_name, test_name) == 0) { 4216 sort_key->field_idx = idx; 4217 descending = is_descending(field_str); 4218 if (descending < 0) { 4219 ret = descending; 4220 goto out; 4221 } 4222 sort_key->descending = descending; 4223 break; 4224 } 4225 } 4226 if (j == hist_data->n_fields) { 4227 ret = -EINVAL; 4228 break; 4229 } 4230 } 4231 4232 hist_data->n_sort_keys = i; 4233 out: 4234 return ret; 4235 } 4236 4237 static void destroy_actions(struct hist_trigger_data *hist_data) 4238 { 4239 unsigned int i; 4240 4241 for (i = 0; i < hist_data->n_actions; i++) { 4242 struct action_data *data = hist_data->actions[i]; 4243 4244 if (data->fn == action_trace) 4245 onmatch_destroy(data); 4246 else if (data->fn == onmax_save) 4247 onmax_destroy(data); 4248 else 4249 kfree(data); 4250 } 4251 } 4252 4253 static int parse_actions(struct hist_trigger_data *hist_data) 4254 { 4255 struct trace_array *tr = hist_data->event_file->tr; 4256 struct action_data *data; 4257 unsigned int i; 4258 int ret = 0; 4259 char *str; 4260 4261 for (i = 0; i < hist_data->attrs->n_actions; i++) { 4262 str = hist_data->attrs->action_str[i]; 4263 4264 if (strncmp(str, "onmatch(", strlen("onmatch(")) == 0) { 4265 char *action_str = str + strlen("onmatch("); 4266 4267 data = onmatch_parse(tr, action_str); 4268 if (IS_ERR(data)) { 4269 ret = PTR_ERR(data); 4270 break; 4271 } 4272 data->fn = action_trace; 4273 } else if (strncmp(str, "onmax(", strlen("onmax(")) == 0) { 4274 char *action_str = str + strlen("onmax("); 4275 4276 data = onmax_parse(action_str); 4277 if (IS_ERR(data)) { 4278 ret = PTR_ERR(data); 4279 break; 4280 } 4281 data->fn = onmax_save; 4282 } else { 4283 ret = -EINVAL; 4284 break; 4285 } 4286 4287 hist_data->actions[hist_data->n_actions++] = data; 4288 } 4289 4290 return ret; 4291 } 4292 4293 static int create_actions(struct hist_trigger_data *hist_data, 4294 struct trace_event_file *file) 4295 { 4296 struct action_data *data; 4297 unsigned int i; 4298 int ret = 0; 4299 4300 for (i = 0; i < hist_data->attrs->n_actions; i++) { 4301 data = hist_data->actions[i]; 4302 4303 if (data->fn == action_trace) { 4304 ret = onmatch_create(hist_data, file, data); 4305 if (ret) 4306 return ret; 4307 } else if (data->fn == onmax_save) { 4308 ret = onmax_create(hist_data, data); 4309 if (ret) 4310 return ret; 4311 } 4312 } 4313 4314 return ret; 4315 } 4316 4317 static void print_actions(struct seq_file *m, 4318 struct hist_trigger_data *hist_data, 4319 struct tracing_map_elt *elt) 4320 { 4321 unsigned int i; 4322 4323 for (i = 0; i < hist_data->n_actions; i++) { 4324 struct action_data *data = hist_data->actions[i]; 4325 4326 if (data->fn == onmax_save) 4327 onmax_print(m, hist_data, elt, data); 4328 } 4329 } 4330 4331 static void print_onmax_spec(struct seq_file *m, 4332 struct hist_trigger_data *hist_data, 4333 struct action_data *data) 4334 { 4335 unsigned int i; 4336 4337 seq_puts(m, ":onmax("); 4338 seq_printf(m, "%s", data->onmax.var_str); 4339 seq_printf(m, ").%s(", data->onmax.fn_name); 4340 4341 for (i = 0; i < hist_data->n_max_vars; i++) { 4342 seq_printf(m, "%s", hist_data->max_vars[i]->var->var.name); 4343 if (i < hist_data->n_max_vars - 1) 4344 seq_puts(m, ","); 4345 } 4346 seq_puts(m, ")"); 4347 } 4348 4349 static void print_onmatch_spec(struct seq_file *m, 4350 struct hist_trigger_data *hist_data, 4351 struct action_data *data) 4352 { 4353 unsigned int i; 4354 4355 seq_printf(m, ":onmatch(%s.%s).", data->onmatch.match_event_system, 4356 data->onmatch.match_event); 4357 4358 seq_printf(m, "%s(", data->onmatch.synth_event->name); 4359 4360 for (i = 0; i < data->n_params; i++) { 4361 if (i) 4362 seq_puts(m, ","); 4363 seq_printf(m, "%s", data->params[i]); 4364 } 4365 4366 seq_puts(m, ")"); 4367 } 4368 4369 static bool actions_match(struct hist_trigger_data *hist_data, 4370 struct hist_trigger_data *hist_data_test) 4371 { 4372 unsigned int i, j; 4373 4374 if (hist_data->n_actions != hist_data_test->n_actions) 4375 return false; 4376 4377 for (i = 0; i < hist_data->n_actions; i++) { 4378 struct action_data *data = hist_data->actions[i]; 4379 struct action_data *data_test = hist_data_test->actions[i]; 4380 4381 if (data->fn != data_test->fn) 4382 return false; 4383 4384 if (data->n_params != data_test->n_params) 4385 return false; 4386 4387 for (j = 0; j < data->n_params; j++) { 4388 if (strcmp(data->params[j], data_test->params[j]) != 0) 4389 return false; 4390 } 4391 4392 if (data->fn == action_trace) { 4393 if (strcmp(data->onmatch.synth_event_name, 4394 data_test->onmatch.synth_event_name) != 0) 4395 return false; 4396 if (strcmp(data->onmatch.match_event_system, 4397 data_test->onmatch.match_event_system) != 0) 4398 return false; 4399 if (strcmp(data->onmatch.match_event, 4400 data_test->onmatch.match_event) != 0) 4401 return false; 4402 } else if (data->fn == onmax_save) { 4403 if (strcmp(data->onmax.var_str, 4404 data_test->onmax.var_str) != 0) 4405 return false; 4406 if (strcmp(data->onmax.fn_name, 4407 data_test->onmax.fn_name) != 0) 4408 return false; 4409 } 4410 } 4411 4412 return true; 4413 } 4414 4415 4416 static void print_actions_spec(struct seq_file *m, 4417 struct hist_trigger_data *hist_data) 4418 { 4419 unsigned int i; 4420 4421 for (i = 0; i < hist_data->n_actions; i++) { 4422 struct action_data *data = hist_data->actions[i]; 4423 4424 if (data->fn == action_trace) 4425 print_onmatch_spec(m, hist_data, data); 4426 else if (data->fn == onmax_save) 4427 print_onmax_spec(m, hist_data, data); 4428 } 4429 } 4430 4431 static void destroy_field_var_hists(struct hist_trigger_data *hist_data) 4432 { 4433 unsigned int i; 4434 4435 for (i = 0; i < hist_data->n_field_var_hists; i++) { 4436 kfree(hist_data->field_var_hists[i]->cmd); 4437 kfree(hist_data->field_var_hists[i]); 4438 } 4439 } 4440 4441 static void destroy_hist_data(struct hist_trigger_data *hist_data) 4442 { 4443 if (!hist_data) 4444 return; 4445 4446 destroy_hist_trigger_attrs(hist_data->attrs); 4447 destroy_hist_fields(hist_data); 4448 tracing_map_destroy(hist_data->map); 4449 4450 destroy_actions(hist_data); 4451 destroy_field_vars(hist_data); 4452 destroy_field_var_hists(hist_data); 4453 destroy_synth_var_refs(hist_data); 4454 4455 kfree(hist_data); 4456 } 4457 4458 static int create_tracing_map_fields(struct hist_trigger_data *hist_data) 4459 { 4460 struct tracing_map *map = hist_data->map; 4461 struct ftrace_event_field *field; 4462 struct hist_field *hist_field; 4463 int i, idx = 0; 4464 4465 for_each_hist_field(i, hist_data) { 4466 hist_field = hist_data->fields[i]; 4467 if (hist_field->flags & HIST_FIELD_FL_KEY) { 4468 tracing_map_cmp_fn_t cmp_fn; 4469 4470 field = hist_field->field; 4471 4472 if (hist_field->flags & HIST_FIELD_FL_STACKTRACE) 4473 cmp_fn = tracing_map_cmp_none; 4474 else if (!field) 4475 cmp_fn = tracing_map_cmp_num(hist_field->size, 4476 hist_field->is_signed); 4477 else if (is_string_field(field)) 4478 cmp_fn = tracing_map_cmp_string; 4479 else 4480 cmp_fn = tracing_map_cmp_num(field->size, 4481 field->is_signed); 4482 idx = tracing_map_add_key_field(map, 4483 hist_field->offset, 4484 cmp_fn); 4485 } else if (!(hist_field->flags & HIST_FIELD_FL_VAR)) 4486 idx = tracing_map_add_sum_field(map); 4487 4488 if (idx < 0) 4489 return idx; 4490 4491 if (hist_field->flags & HIST_FIELD_FL_VAR) { 4492 idx = tracing_map_add_var(map); 4493 if (idx < 0) 4494 return idx; 4495 hist_field->var.idx = idx; 4496 hist_field->var.hist_data = hist_data; 4497 } 4498 } 4499 4500 return 0; 4501 } 4502 4503 static struct hist_trigger_data * 4504 create_hist_data(unsigned int map_bits, 4505 struct hist_trigger_attrs *attrs, 4506 struct trace_event_file *file, 4507 bool remove) 4508 { 4509 const struct tracing_map_ops *map_ops = NULL; 4510 struct hist_trigger_data *hist_data; 4511 int ret = 0; 4512 4513 hist_data = kzalloc(sizeof(*hist_data), GFP_KERNEL); 4514 if (!hist_data) 4515 return ERR_PTR(-ENOMEM); 4516 4517 hist_data->attrs = attrs; 4518 hist_data->remove = remove; 4519 hist_data->event_file = file; 4520 4521 ret = parse_actions(hist_data); 4522 if (ret) 4523 goto free; 4524 4525 ret = create_hist_fields(hist_data, file); 4526 if (ret) 4527 goto free; 4528 4529 ret = create_sort_keys(hist_data); 4530 if (ret) 4531 goto free; 4532 4533 map_ops = &hist_trigger_elt_data_ops; 4534 4535 hist_data->map = tracing_map_create(map_bits, hist_data->key_size, 4536 map_ops, hist_data); 4537 if (IS_ERR(hist_data->map)) { 4538 ret = PTR_ERR(hist_data->map); 4539 hist_data->map = NULL; 4540 goto free; 4541 } 4542 4543 ret = create_tracing_map_fields(hist_data); 4544 if (ret) 4545 goto free; 4546 out: 4547 return hist_data; 4548 free: 4549 hist_data->attrs = NULL; 4550 4551 destroy_hist_data(hist_data); 4552 4553 hist_data = ERR_PTR(ret); 4554 4555 goto out; 4556 } 4557 4558 static void hist_trigger_elt_update(struct hist_trigger_data *hist_data, 4559 struct tracing_map_elt *elt, void *rec, 4560 struct ring_buffer_event *rbe, 4561 u64 *var_ref_vals) 4562 { 4563 struct hist_elt_data *elt_data; 4564 struct hist_field *hist_field; 4565 unsigned int i, var_idx; 4566 u64 hist_val; 4567 4568 elt_data = elt->private_data; 4569 elt_data->var_ref_vals = var_ref_vals; 4570 4571 for_each_hist_val_field(i, hist_data) { 4572 hist_field = hist_data->fields[i]; 4573 hist_val = hist_field->fn(hist_field, elt, rbe, rec); 4574 if (hist_field->flags & HIST_FIELD_FL_VAR) { 4575 var_idx = hist_field->var.idx; 4576 tracing_map_set_var(elt, var_idx, hist_val); 4577 continue; 4578 } 4579 tracing_map_update_sum(elt, i, hist_val); 4580 } 4581 4582 for_each_hist_key_field(i, hist_data) { 4583 hist_field = hist_data->fields[i]; 4584 if (hist_field->flags & HIST_FIELD_FL_VAR) { 4585 hist_val = hist_field->fn(hist_field, elt, rbe, rec); 4586 var_idx = hist_field->var.idx; 4587 tracing_map_set_var(elt, var_idx, hist_val); 4588 } 4589 } 4590 4591 update_field_vars(hist_data, elt, rbe, rec); 4592 } 4593 4594 static inline void add_to_key(char *compound_key, void *key, 4595 struct hist_field *key_field, void *rec) 4596 { 4597 size_t size = key_field->size; 4598 4599 if (key_field->flags & HIST_FIELD_FL_STRING) { 4600 struct ftrace_event_field *field; 4601 4602 field = key_field->field; 4603 if (field->filter_type == FILTER_DYN_STRING) 4604 size = *(u32 *)(rec + field->offset) >> 16; 4605 else if (field->filter_type == FILTER_PTR_STRING) 4606 size = strlen(key); 4607 else if (field->filter_type == FILTER_STATIC_STRING) 4608 size = field->size; 4609 4610 /* ensure NULL-termination */ 4611 if (size > key_field->size - 1) 4612 size = key_field->size - 1; 4613 } 4614 4615 memcpy(compound_key + key_field->offset, key, size); 4616 } 4617 4618 static void 4619 hist_trigger_actions(struct hist_trigger_data *hist_data, 4620 struct tracing_map_elt *elt, void *rec, 4621 struct ring_buffer_event *rbe, u64 *var_ref_vals) 4622 { 4623 struct action_data *data; 4624 unsigned int i; 4625 4626 for (i = 0; i < hist_data->n_actions; i++) { 4627 data = hist_data->actions[i]; 4628 data->fn(hist_data, elt, rec, rbe, data, var_ref_vals); 4629 } 4630 } 4631 4632 static void event_hist_trigger(struct event_trigger_data *data, void *rec, 4633 struct ring_buffer_event *rbe) 4634 { 4635 struct hist_trigger_data *hist_data = data->private_data; 4636 bool use_compound_key = (hist_data->n_keys > 1); 4637 unsigned long entries[HIST_STACKTRACE_DEPTH]; 4638 u64 var_ref_vals[TRACING_MAP_VARS_MAX]; 4639 char compound_key[HIST_KEY_SIZE_MAX]; 4640 struct tracing_map_elt *elt = NULL; 4641 struct stack_trace stacktrace; 4642 struct hist_field *key_field; 4643 u64 field_contents; 4644 void *key = NULL; 4645 unsigned int i; 4646 4647 memset(compound_key, 0, hist_data->key_size); 4648 4649 for_each_hist_key_field(i, hist_data) { 4650 key_field = hist_data->fields[i]; 4651 4652 if (key_field->flags & HIST_FIELD_FL_STACKTRACE) { 4653 stacktrace.max_entries = HIST_STACKTRACE_DEPTH; 4654 stacktrace.entries = entries; 4655 stacktrace.nr_entries = 0; 4656 stacktrace.skip = HIST_STACKTRACE_SKIP; 4657 4658 memset(stacktrace.entries, 0, HIST_STACKTRACE_SIZE); 4659 save_stack_trace(&stacktrace); 4660 4661 key = entries; 4662 } else { 4663 field_contents = key_field->fn(key_field, elt, rbe, rec); 4664 if (key_field->flags & HIST_FIELD_FL_STRING) { 4665 key = (void *)(unsigned long)field_contents; 4666 use_compound_key = true; 4667 } else 4668 key = (void *)&field_contents; 4669 } 4670 4671 if (use_compound_key) 4672 add_to_key(compound_key, key, key_field, rec); 4673 } 4674 4675 if (use_compound_key) 4676 key = compound_key; 4677 4678 if (hist_data->n_var_refs && 4679 !resolve_var_refs(hist_data, key, var_ref_vals, false)) 4680 return; 4681 4682 elt = tracing_map_insert(hist_data->map, key); 4683 if (!elt) 4684 return; 4685 4686 hist_trigger_elt_update(hist_data, elt, rec, rbe, var_ref_vals); 4687 4688 if (resolve_var_refs(hist_data, key, var_ref_vals, true)) 4689 hist_trigger_actions(hist_data, elt, rec, rbe, var_ref_vals); 4690 } 4691 4692 static void hist_trigger_stacktrace_print(struct seq_file *m, 4693 unsigned long *stacktrace_entries, 4694 unsigned int max_entries) 4695 { 4696 char str[KSYM_SYMBOL_LEN]; 4697 unsigned int spaces = 8; 4698 unsigned int i; 4699 4700 for (i = 0; i < max_entries; i++) { 4701 if (stacktrace_entries[i] == ULONG_MAX) 4702 return; 4703 4704 seq_printf(m, "%*c", 1 + spaces, ' '); 4705 sprint_symbol(str, stacktrace_entries[i]); 4706 seq_printf(m, "%s\n", str); 4707 } 4708 } 4709 4710 static void 4711 hist_trigger_entry_print(struct seq_file *m, 4712 struct hist_trigger_data *hist_data, void *key, 4713 struct tracing_map_elt *elt) 4714 { 4715 struct hist_field *key_field; 4716 char str[KSYM_SYMBOL_LEN]; 4717 bool multiline = false; 4718 const char *field_name; 4719 unsigned int i; 4720 u64 uval; 4721 4722 seq_puts(m, "{ "); 4723 4724 for_each_hist_key_field(i, hist_data) { 4725 key_field = hist_data->fields[i]; 4726 4727 if (i > hist_data->n_vals) 4728 seq_puts(m, ", "); 4729 4730 field_name = hist_field_name(key_field, 0); 4731 4732 if (key_field->flags & HIST_FIELD_FL_HEX) { 4733 uval = *(u64 *)(key + key_field->offset); 4734 seq_printf(m, "%s: %llx", field_name, uval); 4735 } else if (key_field->flags & HIST_FIELD_FL_SYM) { 4736 uval = *(u64 *)(key + key_field->offset); 4737 sprint_symbol_no_offset(str, uval); 4738 seq_printf(m, "%s: [%llx] %-45s", field_name, 4739 uval, str); 4740 } else if (key_field->flags & HIST_FIELD_FL_SYM_OFFSET) { 4741 uval = *(u64 *)(key + key_field->offset); 4742 sprint_symbol(str, uval); 4743 seq_printf(m, "%s: [%llx] %-55s", field_name, 4744 uval, str); 4745 } else if (key_field->flags & HIST_FIELD_FL_EXECNAME) { 4746 struct hist_elt_data *elt_data = elt->private_data; 4747 char *comm; 4748 4749 if (WARN_ON_ONCE(!elt_data)) 4750 return; 4751 4752 comm = elt_data->comm; 4753 4754 uval = *(u64 *)(key + key_field->offset); 4755 seq_printf(m, "%s: %-16s[%10llu]", field_name, 4756 comm, uval); 4757 } else if (key_field->flags & HIST_FIELD_FL_SYSCALL) { 4758 const char *syscall_name; 4759 4760 uval = *(u64 *)(key + key_field->offset); 4761 syscall_name = get_syscall_name(uval); 4762 if (!syscall_name) 4763 syscall_name = "unknown_syscall"; 4764 4765 seq_printf(m, "%s: %-30s[%3llu]", field_name, 4766 syscall_name, uval); 4767 } else if (key_field->flags & HIST_FIELD_FL_STACKTRACE) { 4768 seq_puts(m, "stacktrace:\n"); 4769 hist_trigger_stacktrace_print(m, 4770 key + key_field->offset, 4771 HIST_STACKTRACE_DEPTH); 4772 multiline = true; 4773 } else if (key_field->flags & HIST_FIELD_FL_LOG2) { 4774 seq_printf(m, "%s: ~ 2^%-2llu", field_name, 4775 *(u64 *)(key + key_field->offset)); 4776 } else if (key_field->flags & HIST_FIELD_FL_STRING) { 4777 seq_printf(m, "%s: %-50s", field_name, 4778 (char *)(key + key_field->offset)); 4779 } else { 4780 uval = *(u64 *)(key + key_field->offset); 4781 seq_printf(m, "%s: %10llu", field_name, uval); 4782 } 4783 } 4784 4785 if (!multiline) 4786 seq_puts(m, " "); 4787 4788 seq_puts(m, "}"); 4789 4790 seq_printf(m, " hitcount: %10llu", 4791 tracing_map_read_sum(elt, HITCOUNT_IDX)); 4792 4793 for (i = 1; i < hist_data->n_vals; i++) { 4794 field_name = hist_field_name(hist_data->fields[i], 0); 4795 4796 if (hist_data->fields[i]->flags & HIST_FIELD_FL_VAR || 4797 hist_data->fields[i]->flags & HIST_FIELD_FL_EXPR) 4798 continue; 4799 4800 if (hist_data->fields[i]->flags & HIST_FIELD_FL_HEX) { 4801 seq_printf(m, " %s: %10llx", field_name, 4802 tracing_map_read_sum(elt, i)); 4803 } else { 4804 seq_printf(m, " %s: %10llu", field_name, 4805 tracing_map_read_sum(elt, i)); 4806 } 4807 } 4808 4809 print_actions(m, hist_data, elt); 4810 4811 seq_puts(m, "\n"); 4812 } 4813 4814 static int print_entries(struct seq_file *m, 4815 struct hist_trigger_data *hist_data) 4816 { 4817 struct tracing_map_sort_entry **sort_entries = NULL; 4818 struct tracing_map *map = hist_data->map; 4819 int i, n_entries; 4820 4821 n_entries = tracing_map_sort_entries(map, hist_data->sort_keys, 4822 hist_data->n_sort_keys, 4823 &sort_entries); 4824 if (n_entries < 0) 4825 return n_entries; 4826 4827 for (i = 0; i < n_entries; i++) 4828 hist_trigger_entry_print(m, hist_data, 4829 sort_entries[i]->key, 4830 sort_entries[i]->elt); 4831 4832 tracing_map_destroy_sort_entries(sort_entries, n_entries); 4833 4834 return n_entries; 4835 } 4836 4837 static void hist_trigger_show(struct seq_file *m, 4838 struct event_trigger_data *data, int n) 4839 { 4840 struct hist_trigger_data *hist_data; 4841 int n_entries; 4842 4843 if (n > 0) 4844 seq_puts(m, "\n\n"); 4845 4846 seq_puts(m, "# event histogram\n#\n# trigger info: "); 4847 data->ops->print(m, data->ops, data); 4848 seq_puts(m, "#\n\n"); 4849 4850 hist_data = data->private_data; 4851 n_entries = print_entries(m, hist_data); 4852 if (n_entries < 0) 4853 n_entries = 0; 4854 4855 seq_printf(m, "\nTotals:\n Hits: %llu\n Entries: %u\n Dropped: %llu\n", 4856 (u64)atomic64_read(&hist_data->map->hits), 4857 n_entries, (u64)atomic64_read(&hist_data->map->drops)); 4858 } 4859 4860 static int hist_show(struct seq_file *m, void *v) 4861 { 4862 struct event_trigger_data *data; 4863 struct trace_event_file *event_file; 4864 int n = 0, ret = 0; 4865 4866 mutex_lock(&event_mutex); 4867 4868 event_file = event_file_data(m->private); 4869 if (unlikely(!event_file)) { 4870 ret = -ENODEV; 4871 goto out_unlock; 4872 } 4873 4874 list_for_each_entry_rcu(data, &event_file->triggers, list) { 4875 if (data->cmd_ops->trigger_type == ETT_EVENT_HIST) 4876 hist_trigger_show(m, data, n++); 4877 } 4878 4879 if (have_hist_err()) { 4880 seq_printf(m, "\nERROR: %s\n", hist_err_str); 4881 seq_printf(m, " Last command: %s\n", last_hist_cmd); 4882 } 4883 4884 out_unlock: 4885 mutex_unlock(&event_mutex); 4886 4887 return ret; 4888 } 4889 4890 static int event_hist_open(struct inode *inode, struct file *file) 4891 { 4892 return single_open(file, hist_show, file); 4893 } 4894 4895 const struct file_operations event_hist_fops = { 4896 .open = event_hist_open, 4897 .read = seq_read, 4898 .llseek = seq_lseek, 4899 .release = single_release, 4900 }; 4901 4902 static void hist_field_print(struct seq_file *m, struct hist_field *hist_field) 4903 { 4904 const char *field_name = hist_field_name(hist_field, 0); 4905 4906 if (hist_field->var.name) 4907 seq_printf(m, "%s=", hist_field->var.name); 4908 4909 if (hist_field->flags & HIST_FIELD_FL_CPU) 4910 seq_puts(m, "cpu"); 4911 else if (field_name) { 4912 if (hist_field->flags & HIST_FIELD_FL_VAR_REF || 4913 hist_field->flags & HIST_FIELD_FL_ALIAS) 4914 seq_putc(m, '$'); 4915 seq_printf(m, "%s", field_name); 4916 } else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP) 4917 seq_puts(m, "common_timestamp"); 4918 4919 if (hist_field->flags) { 4920 if (!(hist_field->flags & HIST_FIELD_FL_VAR_REF) && 4921 !(hist_field->flags & HIST_FIELD_FL_EXPR)) { 4922 const char *flags = get_hist_field_flags(hist_field); 4923 4924 if (flags) 4925 seq_printf(m, ".%s", flags); 4926 } 4927 } 4928 } 4929 4930 static int event_hist_trigger_print(struct seq_file *m, 4931 struct event_trigger_ops *ops, 4932 struct event_trigger_data *data) 4933 { 4934 struct hist_trigger_data *hist_data = data->private_data; 4935 struct hist_field *field; 4936 bool have_var = false; 4937 unsigned int i; 4938 4939 seq_puts(m, "hist:"); 4940 4941 if (data->name) 4942 seq_printf(m, "%s:", data->name); 4943 4944 seq_puts(m, "keys="); 4945 4946 for_each_hist_key_field(i, hist_data) { 4947 field = hist_data->fields[i]; 4948 4949 if (i > hist_data->n_vals) 4950 seq_puts(m, ","); 4951 4952 if (field->flags & HIST_FIELD_FL_STACKTRACE) 4953 seq_puts(m, "stacktrace"); 4954 else 4955 hist_field_print(m, field); 4956 } 4957 4958 seq_puts(m, ":vals="); 4959 4960 for_each_hist_val_field(i, hist_data) { 4961 field = hist_data->fields[i]; 4962 if (field->flags & HIST_FIELD_FL_VAR) { 4963 have_var = true; 4964 continue; 4965 } 4966 4967 if (i == HITCOUNT_IDX) 4968 seq_puts(m, "hitcount"); 4969 else { 4970 seq_puts(m, ","); 4971 hist_field_print(m, field); 4972 } 4973 } 4974 4975 if (have_var) { 4976 unsigned int n = 0; 4977 4978 seq_puts(m, ":"); 4979 4980 for_each_hist_val_field(i, hist_data) { 4981 field = hist_data->fields[i]; 4982 4983 if (field->flags & HIST_FIELD_FL_VAR) { 4984 if (n++) 4985 seq_puts(m, ","); 4986 hist_field_print(m, field); 4987 } 4988 } 4989 } 4990 4991 seq_puts(m, ":sort="); 4992 4993 for (i = 0; i < hist_data->n_sort_keys; i++) { 4994 struct tracing_map_sort_key *sort_key; 4995 unsigned int idx, first_key_idx; 4996 4997 /* skip VAR vals */ 4998 first_key_idx = hist_data->n_vals - hist_data->n_vars; 4999 5000 sort_key = &hist_data->sort_keys[i]; 5001 idx = sort_key->field_idx; 5002 5003 if (WARN_ON(idx >= HIST_FIELDS_MAX)) 5004 return -EINVAL; 5005 5006 if (i > 0) 5007 seq_puts(m, ","); 5008 5009 if (idx == HITCOUNT_IDX) 5010 seq_puts(m, "hitcount"); 5011 else { 5012 if (idx >= first_key_idx) 5013 idx += hist_data->n_vars; 5014 hist_field_print(m, hist_data->fields[idx]); 5015 } 5016 5017 if (sort_key->descending) 5018 seq_puts(m, ".descending"); 5019 } 5020 seq_printf(m, ":size=%u", (1 << hist_data->map->map_bits)); 5021 if (hist_data->enable_timestamps) 5022 seq_printf(m, ":clock=%s", hist_data->attrs->clock); 5023 5024 print_actions_spec(m, hist_data); 5025 5026 if (data->filter_str) 5027 seq_printf(m, " if %s", data->filter_str); 5028 5029 if (data->paused) 5030 seq_puts(m, " [paused]"); 5031 else 5032 seq_puts(m, " [active]"); 5033 5034 seq_putc(m, '\n'); 5035 5036 return 0; 5037 } 5038 5039 static int event_hist_trigger_init(struct event_trigger_ops *ops, 5040 struct event_trigger_data *data) 5041 { 5042 struct hist_trigger_data *hist_data = data->private_data; 5043 5044 if (!data->ref && hist_data->attrs->name) 5045 save_named_trigger(hist_data->attrs->name, data); 5046 5047 data->ref++; 5048 5049 return 0; 5050 } 5051 5052 static void unregister_field_var_hists(struct hist_trigger_data *hist_data) 5053 { 5054 struct trace_event_file *file; 5055 unsigned int i; 5056 char *cmd; 5057 int ret; 5058 5059 for (i = 0; i < hist_data->n_field_var_hists; i++) { 5060 file = hist_data->field_var_hists[i]->hist_data->event_file; 5061 cmd = hist_data->field_var_hists[i]->cmd; 5062 ret = event_hist_trigger_func(&trigger_hist_cmd, file, 5063 "!hist", "hist", cmd); 5064 } 5065 } 5066 5067 static void event_hist_trigger_free(struct event_trigger_ops *ops, 5068 struct event_trigger_data *data) 5069 { 5070 struct hist_trigger_data *hist_data = data->private_data; 5071 5072 if (WARN_ON_ONCE(data->ref <= 0)) 5073 return; 5074 5075 data->ref--; 5076 if (!data->ref) { 5077 if (data->name) 5078 del_named_trigger(data); 5079 5080 trigger_data_free(data); 5081 5082 remove_hist_vars(hist_data); 5083 5084 unregister_field_var_hists(hist_data); 5085 5086 destroy_hist_data(hist_data); 5087 } 5088 } 5089 5090 static struct event_trigger_ops event_hist_trigger_ops = { 5091 .func = event_hist_trigger, 5092 .print = event_hist_trigger_print, 5093 .init = event_hist_trigger_init, 5094 .free = event_hist_trigger_free, 5095 }; 5096 5097 static int event_hist_trigger_named_init(struct event_trigger_ops *ops, 5098 struct event_trigger_data *data) 5099 { 5100 data->ref++; 5101 5102 save_named_trigger(data->named_data->name, data); 5103 5104 event_hist_trigger_init(ops, data->named_data); 5105 5106 return 0; 5107 } 5108 5109 static void event_hist_trigger_named_free(struct event_trigger_ops *ops, 5110 struct event_trigger_data *data) 5111 { 5112 if (WARN_ON_ONCE(data->ref <= 0)) 5113 return; 5114 5115 event_hist_trigger_free(ops, data->named_data); 5116 5117 data->ref--; 5118 if (!data->ref) { 5119 del_named_trigger(data); 5120 trigger_data_free(data); 5121 } 5122 } 5123 5124 static struct event_trigger_ops event_hist_trigger_named_ops = { 5125 .func = event_hist_trigger, 5126 .print = event_hist_trigger_print, 5127 .init = event_hist_trigger_named_init, 5128 .free = event_hist_trigger_named_free, 5129 }; 5130 5131 static struct event_trigger_ops *event_hist_get_trigger_ops(char *cmd, 5132 char *param) 5133 { 5134 return &event_hist_trigger_ops; 5135 } 5136 5137 static void hist_clear(struct event_trigger_data *data) 5138 { 5139 struct hist_trigger_data *hist_data = data->private_data; 5140 5141 if (data->name) 5142 pause_named_trigger(data); 5143 5144 synchronize_sched(); 5145 5146 tracing_map_clear(hist_data->map); 5147 5148 if (data->name) 5149 unpause_named_trigger(data); 5150 } 5151 5152 static bool compatible_field(struct ftrace_event_field *field, 5153 struct ftrace_event_field *test_field) 5154 { 5155 if (field == test_field) 5156 return true; 5157 if (field == NULL || test_field == NULL) 5158 return false; 5159 if (strcmp(field->name, test_field->name) != 0) 5160 return false; 5161 if (strcmp(field->type, test_field->type) != 0) 5162 return false; 5163 if (field->size != test_field->size) 5164 return false; 5165 if (field->is_signed != test_field->is_signed) 5166 return false; 5167 5168 return true; 5169 } 5170 5171 static bool hist_trigger_match(struct event_trigger_data *data, 5172 struct event_trigger_data *data_test, 5173 struct event_trigger_data *named_data, 5174 bool ignore_filter) 5175 { 5176 struct tracing_map_sort_key *sort_key, *sort_key_test; 5177 struct hist_trigger_data *hist_data, *hist_data_test; 5178 struct hist_field *key_field, *key_field_test; 5179 unsigned int i; 5180 5181 if (named_data && (named_data != data_test) && 5182 (named_data != data_test->named_data)) 5183 return false; 5184 5185 if (!named_data && is_named_trigger(data_test)) 5186 return false; 5187 5188 hist_data = data->private_data; 5189 hist_data_test = data_test->private_data; 5190 5191 if (hist_data->n_vals != hist_data_test->n_vals || 5192 hist_data->n_fields != hist_data_test->n_fields || 5193 hist_data->n_sort_keys != hist_data_test->n_sort_keys) 5194 return false; 5195 5196 if (!ignore_filter) { 5197 if ((data->filter_str && !data_test->filter_str) || 5198 (!data->filter_str && data_test->filter_str)) 5199 return false; 5200 } 5201 5202 for_each_hist_field(i, hist_data) { 5203 key_field = hist_data->fields[i]; 5204 key_field_test = hist_data_test->fields[i]; 5205 5206 if (key_field->flags != key_field_test->flags) 5207 return false; 5208 if (!compatible_field(key_field->field, key_field_test->field)) 5209 return false; 5210 if (key_field->offset != key_field_test->offset) 5211 return false; 5212 if (key_field->size != key_field_test->size) 5213 return false; 5214 if (key_field->is_signed != key_field_test->is_signed) 5215 return false; 5216 if (!!key_field->var.name != !!key_field_test->var.name) 5217 return false; 5218 if (key_field->var.name && 5219 strcmp(key_field->var.name, key_field_test->var.name) != 0) 5220 return false; 5221 } 5222 5223 for (i = 0; i < hist_data->n_sort_keys; i++) { 5224 sort_key = &hist_data->sort_keys[i]; 5225 sort_key_test = &hist_data_test->sort_keys[i]; 5226 5227 if (sort_key->field_idx != sort_key_test->field_idx || 5228 sort_key->descending != sort_key_test->descending) 5229 return false; 5230 } 5231 5232 if (!ignore_filter && data->filter_str && 5233 (strcmp(data->filter_str, data_test->filter_str) != 0)) 5234 return false; 5235 5236 if (!actions_match(hist_data, hist_data_test)) 5237 return false; 5238 5239 return true; 5240 } 5241 5242 static int hist_register_trigger(char *glob, struct event_trigger_ops *ops, 5243 struct event_trigger_data *data, 5244 struct trace_event_file *file) 5245 { 5246 struct hist_trigger_data *hist_data = data->private_data; 5247 struct event_trigger_data *test, *named_data = NULL; 5248 int ret = 0; 5249 5250 if (hist_data->attrs->name) { 5251 named_data = find_named_trigger(hist_data->attrs->name); 5252 if (named_data) { 5253 if (!hist_trigger_match(data, named_data, named_data, 5254 true)) { 5255 hist_err("Named hist trigger doesn't match existing named trigger (includes variables): ", hist_data->attrs->name); 5256 ret = -EINVAL; 5257 goto out; 5258 } 5259 } 5260 } 5261 5262 if (hist_data->attrs->name && !named_data) 5263 goto new; 5264 5265 list_for_each_entry_rcu(test, &file->triggers, list) { 5266 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { 5267 if (!hist_trigger_match(data, test, named_data, false)) 5268 continue; 5269 if (hist_data->attrs->pause) 5270 test->paused = true; 5271 else if (hist_data->attrs->cont) 5272 test->paused = false; 5273 else if (hist_data->attrs->clear) 5274 hist_clear(test); 5275 else { 5276 hist_err("Hist trigger already exists", NULL); 5277 ret = -EEXIST; 5278 } 5279 goto out; 5280 } 5281 } 5282 new: 5283 if (hist_data->attrs->cont || hist_data->attrs->clear) { 5284 hist_err("Can't clear or continue a nonexistent hist trigger", NULL); 5285 ret = -ENOENT; 5286 goto out; 5287 } 5288 5289 if (hist_data->attrs->pause) 5290 data->paused = true; 5291 5292 if (named_data) { 5293 data->private_data = named_data->private_data; 5294 set_named_trigger_data(data, named_data); 5295 data->ops = &event_hist_trigger_named_ops; 5296 } 5297 5298 if (data->ops->init) { 5299 ret = data->ops->init(data->ops, data); 5300 if (ret < 0) 5301 goto out; 5302 } 5303 5304 if (hist_data->enable_timestamps) { 5305 char *clock = hist_data->attrs->clock; 5306 5307 ret = tracing_set_clock(file->tr, hist_data->attrs->clock); 5308 if (ret) { 5309 hist_err("Couldn't set trace_clock: ", clock); 5310 goto out; 5311 } 5312 5313 tracing_set_time_stamp_abs(file->tr, true); 5314 } 5315 5316 if (named_data) 5317 destroy_hist_data(hist_data); 5318 5319 ret++; 5320 out: 5321 return ret; 5322 } 5323 5324 static int hist_trigger_enable(struct event_trigger_data *data, 5325 struct trace_event_file *file) 5326 { 5327 int ret = 0; 5328 5329 list_add_tail_rcu(&data->list, &file->triggers); 5330 5331 update_cond_flag(file); 5332 5333 if (trace_event_trigger_enable_disable(file, 1) < 0) { 5334 list_del_rcu(&data->list); 5335 update_cond_flag(file); 5336 ret--; 5337 } 5338 5339 return ret; 5340 } 5341 5342 static bool have_hist_trigger_match(struct event_trigger_data *data, 5343 struct trace_event_file *file) 5344 { 5345 struct hist_trigger_data *hist_data = data->private_data; 5346 struct event_trigger_data *test, *named_data = NULL; 5347 bool match = false; 5348 5349 if (hist_data->attrs->name) 5350 named_data = find_named_trigger(hist_data->attrs->name); 5351 5352 list_for_each_entry_rcu(test, &file->triggers, list) { 5353 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { 5354 if (hist_trigger_match(data, test, named_data, false)) { 5355 match = true; 5356 break; 5357 } 5358 } 5359 } 5360 5361 return match; 5362 } 5363 5364 static bool hist_trigger_check_refs(struct event_trigger_data *data, 5365 struct trace_event_file *file) 5366 { 5367 struct hist_trigger_data *hist_data = data->private_data; 5368 struct event_trigger_data *test, *named_data = NULL; 5369 5370 if (hist_data->attrs->name) 5371 named_data = find_named_trigger(hist_data->attrs->name); 5372 5373 list_for_each_entry_rcu(test, &file->triggers, list) { 5374 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { 5375 if (!hist_trigger_match(data, test, named_data, false)) 5376 continue; 5377 hist_data = test->private_data; 5378 if (check_var_refs(hist_data)) 5379 return true; 5380 break; 5381 } 5382 } 5383 5384 return false; 5385 } 5386 5387 static void hist_unregister_trigger(char *glob, struct event_trigger_ops *ops, 5388 struct event_trigger_data *data, 5389 struct trace_event_file *file) 5390 { 5391 struct hist_trigger_data *hist_data = data->private_data; 5392 struct event_trigger_data *test, *named_data = NULL; 5393 bool unregistered = false; 5394 5395 if (hist_data->attrs->name) 5396 named_data = find_named_trigger(hist_data->attrs->name); 5397 5398 list_for_each_entry_rcu(test, &file->triggers, list) { 5399 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { 5400 if (!hist_trigger_match(data, test, named_data, false)) 5401 continue; 5402 unregistered = true; 5403 list_del_rcu(&test->list); 5404 trace_event_trigger_enable_disable(file, 0); 5405 update_cond_flag(file); 5406 break; 5407 } 5408 } 5409 5410 if (unregistered && test->ops->free) 5411 test->ops->free(test->ops, test); 5412 5413 if (hist_data->enable_timestamps) { 5414 if (!hist_data->remove || unregistered) 5415 tracing_set_time_stamp_abs(file->tr, false); 5416 } 5417 } 5418 5419 static bool hist_file_check_refs(struct trace_event_file *file) 5420 { 5421 struct hist_trigger_data *hist_data; 5422 struct event_trigger_data *test; 5423 5424 list_for_each_entry_rcu(test, &file->triggers, list) { 5425 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { 5426 hist_data = test->private_data; 5427 if (check_var_refs(hist_data)) 5428 return true; 5429 } 5430 } 5431 5432 return false; 5433 } 5434 5435 static void hist_unreg_all(struct trace_event_file *file) 5436 { 5437 struct event_trigger_data *test, *n; 5438 struct hist_trigger_data *hist_data; 5439 struct synth_event *se; 5440 const char *se_name; 5441 5442 if (hist_file_check_refs(file)) 5443 return; 5444 5445 list_for_each_entry_safe(test, n, &file->triggers, list) { 5446 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { 5447 hist_data = test->private_data; 5448 list_del_rcu(&test->list); 5449 trace_event_trigger_enable_disable(file, 0); 5450 5451 mutex_lock(&synth_event_mutex); 5452 se_name = trace_event_name(file->event_call); 5453 se = find_synth_event(se_name); 5454 if (se) 5455 se->ref--; 5456 mutex_unlock(&synth_event_mutex); 5457 5458 update_cond_flag(file); 5459 if (hist_data->enable_timestamps) 5460 tracing_set_time_stamp_abs(file->tr, false); 5461 if (test->ops->free) 5462 test->ops->free(test->ops, test); 5463 } 5464 } 5465 } 5466 5467 static int event_hist_trigger_func(struct event_command *cmd_ops, 5468 struct trace_event_file *file, 5469 char *glob, char *cmd, char *param) 5470 { 5471 unsigned int hist_trigger_bits = TRACING_MAP_BITS_DEFAULT; 5472 struct event_trigger_data *trigger_data; 5473 struct hist_trigger_attrs *attrs; 5474 struct event_trigger_ops *trigger_ops; 5475 struct hist_trigger_data *hist_data; 5476 struct synth_event *se; 5477 const char *se_name; 5478 bool remove = false; 5479 char *trigger, *p; 5480 int ret = 0; 5481 5482 if (glob && strlen(glob)) { 5483 last_cmd_set(param); 5484 hist_err_clear(); 5485 } 5486 5487 if (!param) 5488 return -EINVAL; 5489 5490 if (glob[0] == '!') 5491 remove = true; 5492 5493 /* 5494 * separate the trigger from the filter (k:v [if filter]) 5495 * allowing for whitespace in the trigger 5496 */ 5497 p = trigger = param; 5498 do { 5499 p = strstr(p, "if"); 5500 if (!p) 5501 break; 5502 if (p == param) 5503 return -EINVAL; 5504 if (*(p - 1) != ' ' && *(p - 1) != '\t') { 5505 p++; 5506 continue; 5507 } 5508 if (p >= param + strlen(param) - strlen("if") - 1) 5509 return -EINVAL; 5510 if (*(p + strlen("if")) != ' ' && *(p + strlen("if")) != '\t') { 5511 p++; 5512 continue; 5513 } 5514 break; 5515 } while (p); 5516 5517 if (!p) 5518 param = NULL; 5519 else { 5520 *(p - 1) = '\0'; 5521 param = strstrip(p); 5522 trigger = strstrip(trigger); 5523 } 5524 5525 attrs = parse_hist_trigger_attrs(trigger); 5526 if (IS_ERR(attrs)) 5527 return PTR_ERR(attrs); 5528 5529 if (attrs->map_bits) 5530 hist_trigger_bits = attrs->map_bits; 5531 5532 hist_data = create_hist_data(hist_trigger_bits, attrs, file, remove); 5533 if (IS_ERR(hist_data)) { 5534 destroy_hist_trigger_attrs(attrs); 5535 return PTR_ERR(hist_data); 5536 } 5537 5538 trigger_ops = cmd_ops->get_trigger_ops(cmd, trigger); 5539 5540 trigger_data = kzalloc(sizeof(*trigger_data), GFP_KERNEL); 5541 if (!trigger_data) { 5542 ret = -ENOMEM; 5543 goto out_free; 5544 } 5545 5546 trigger_data->count = -1; 5547 trigger_data->ops = trigger_ops; 5548 trigger_data->cmd_ops = cmd_ops; 5549 5550 INIT_LIST_HEAD(&trigger_data->list); 5551 RCU_INIT_POINTER(trigger_data->filter, NULL); 5552 5553 trigger_data->private_data = hist_data; 5554 5555 /* if param is non-empty, it's supposed to be a filter */ 5556 if (param && cmd_ops->set_filter) { 5557 ret = cmd_ops->set_filter(param, trigger_data, file); 5558 if (ret < 0) 5559 goto out_free; 5560 } 5561 5562 if (remove) { 5563 if (!have_hist_trigger_match(trigger_data, file)) 5564 goto out_free; 5565 5566 if (hist_trigger_check_refs(trigger_data, file)) { 5567 ret = -EBUSY; 5568 goto out_free; 5569 } 5570 5571 cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file); 5572 5573 mutex_lock(&synth_event_mutex); 5574 se_name = trace_event_name(file->event_call); 5575 se = find_synth_event(se_name); 5576 if (se) 5577 se->ref--; 5578 mutex_unlock(&synth_event_mutex); 5579 5580 ret = 0; 5581 goto out_free; 5582 } 5583 5584 ret = cmd_ops->reg(glob, trigger_ops, trigger_data, file); 5585 /* 5586 * The above returns on success the # of triggers registered, 5587 * but if it didn't register any it returns zero. Consider no 5588 * triggers registered a failure too. 5589 */ 5590 if (!ret) { 5591 if (!(attrs->pause || attrs->cont || attrs->clear)) 5592 ret = -ENOENT; 5593 goto out_free; 5594 } else if (ret < 0) 5595 goto out_free; 5596 5597 if (get_named_trigger_data(trigger_data)) 5598 goto enable; 5599 5600 if (has_hist_vars(hist_data)) 5601 save_hist_vars(hist_data); 5602 5603 ret = create_actions(hist_data, file); 5604 if (ret) 5605 goto out_unreg; 5606 5607 ret = tracing_map_init(hist_data->map); 5608 if (ret) 5609 goto out_unreg; 5610 enable: 5611 ret = hist_trigger_enable(trigger_data, file); 5612 if (ret) 5613 goto out_unreg; 5614 5615 mutex_lock(&synth_event_mutex); 5616 se_name = trace_event_name(file->event_call); 5617 se = find_synth_event(se_name); 5618 if (se) 5619 se->ref++; 5620 mutex_unlock(&synth_event_mutex); 5621 5622 /* Just return zero, not the number of registered triggers */ 5623 ret = 0; 5624 out: 5625 if (ret == 0) 5626 hist_err_clear(); 5627 5628 return ret; 5629 out_unreg: 5630 cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file); 5631 out_free: 5632 if (cmd_ops->set_filter) 5633 cmd_ops->set_filter(NULL, trigger_data, NULL); 5634 5635 remove_hist_vars(hist_data); 5636 5637 kfree(trigger_data); 5638 5639 destroy_hist_data(hist_data); 5640 goto out; 5641 } 5642 5643 static struct event_command trigger_hist_cmd = { 5644 .name = "hist", 5645 .trigger_type = ETT_EVENT_HIST, 5646 .flags = EVENT_CMD_FL_NEEDS_REC, 5647 .func = event_hist_trigger_func, 5648 .reg = hist_register_trigger, 5649 .unreg = hist_unregister_trigger, 5650 .unreg_all = hist_unreg_all, 5651 .get_trigger_ops = event_hist_get_trigger_ops, 5652 .set_filter = set_trigger_filter, 5653 }; 5654 5655 __init int register_trigger_hist_cmd(void) 5656 { 5657 int ret; 5658 5659 ret = register_event_command(&trigger_hist_cmd); 5660 WARN_ON(ret < 0); 5661 5662 return ret; 5663 } 5664 5665 static void 5666 hist_enable_trigger(struct event_trigger_data *data, void *rec, 5667 struct ring_buffer_event *event) 5668 { 5669 struct enable_trigger_data *enable_data = data->private_data; 5670 struct event_trigger_data *test; 5671 5672 list_for_each_entry_rcu(test, &enable_data->file->triggers, list) { 5673 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { 5674 if (enable_data->enable) 5675 test->paused = false; 5676 else 5677 test->paused = true; 5678 } 5679 } 5680 } 5681 5682 static void 5683 hist_enable_count_trigger(struct event_trigger_data *data, void *rec, 5684 struct ring_buffer_event *event) 5685 { 5686 if (!data->count) 5687 return; 5688 5689 if (data->count != -1) 5690 (data->count)--; 5691 5692 hist_enable_trigger(data, rec, event); 5693 } 5694 5695 static struct event_trigger_ops hist_enable_trigger_ops = { 5696 .func = hist_enable_trigger, 5697 .print = event_enable_trigger_print, 5698 .init = event_trigger_init, 5699 .free = event_enable_trigger_free, 5700 }; 5701 5702 static struct event_trigger_ops hist_enable_count_trigger_ops = { 5703 .func = hist_enable_count_trigger, 5704 .print = event_enable_trigger_print, 5705 .init = event_trigger_init, 5706 .free = event_enable_trigger_free, 5707 }; 5708 5709 static struct event_trigger_ops hist_disable_trigger_ops = { 5710 .func = hist_enable_trigger, 5711 .print = event_enable_trigger_print, 5712 .init = event_trigger_init, 5713 .free = event_enable_trigger_free, 5714 }; 5715 5716 static struct event_trigger_ops hist_disable_count_trigger_ops = { 5717 .func = hist_enable_count_trigger, 5718 .print = event_enable_trigger_print, 5719 .init = event_trigger_init, 5720 .free = event_enable_trigger_free, 5721 }; 5722 5723 static struct event_trigger_ops * 5724 hist_enable_get_trigger_ops(char *cmd, char *param) 5725 { 5726 struct event_trigger_ops *ops; 5727 bool enable; 5728 5729 enable = (strcmp(cmd, ENABLE_HIST_STR) == 0); 5730 5731 if (enable) 5732 ops = param ? &hist_enable_count_trigger_ops : 5733 &hist_enable_trigger_ops; 5734 else 5735 ops = param ? &hist_disable_count_trigger_ops : 5736 &hist_disable_trigger_ops; 5737 5738 return ops; 5739 } 5740 5741 static void hist_enable_unreg_all(struct trace_event_file *file) 5742 { 5743 struct event_trigger_data *test, *n; 5744 5745 list_for_each_entry_safe(test, n, &file->triggers, list) { 5746 if (test->cmd_ops->trigger_type == ETT_HIST_ENABLE) { 5747 list_del_rcu(&test->list); 5748 update_cond_flag(file); 5749 trace_event_trigger_enable_disable(file, 0); 5750 if (test->ops->free) 5751 test->ops->free(test->ops, test); 5752 } 5753 } 5754 } 5755 5756 static struct event_command trigger_hist_enable_cmd = { 5757 .name = ENABLE_HIST_STR, 5758 .trigger_type = ETT_HIST_ENABLE, 5759 .func = event_enable_trigger_func, 5760 .reg = event_enable_register_trigger, 5761 .unreg = event_enable_unregister_trigger, 5762 .unreg_all = hist_enable_unreg_all, 5763 .get_trigger_ops = hist_enable_get_trigger_ops, 5764 .set_filter = set_trigger_filter, 5765 }; 5766 5767 static struct event_command trigger_hist_disable_cmd = { 5768 .name = DISABLE_HIST_STR, 5769 .trigger_type = ETT_HIST_ENABLE, 5770 .func = event_enable_trigger_func, 5771 .reg = event_enable_register_trigger, 5772 .unreg = event_enable_unregister_trigger, 5773 .unreg_all = hist_enable_unreg_all, 5774 .get_trigger_ops = hist_enable_get_trigger_ops, 5775 .set_filter = set_trigger_filter, 5776 }; 5777 5778 static __init void unregister_trigger_hist_enable_disable_cmds(void) 5779 { 5780 unregister_event_command(&trigger_hist_enable_cmd); 5781 unregister_event_command(&trigger_hist_disable_cmd); 5782 } 5783 5784 __init int register_trigger_hist_enable_disable_cmds(void) 5785 { 5786 int ret; 5787 5788 ret = register_event_command(&trigger_hist_enable_cmd); 5789 if (WARN_ON(ret < 0)) 5790 return ret; 5791 ret = register_event_command(&trigger_hist_disable_cmd); 5792 if (WARN_ON(ret < 0)) 5793 unregister_trigger_hist_enable_disable_cmds(); 5794 5795 return ret; 5796 } 5797 5798 static __init int trace_events_hist_init(void) 5799 { 5800 struct dentry *entry = NULL; 5801 struct dentry *d_tracer; 5802 int err = 0; 5803 5804 d_tracer = tracing_init_dentry(); 5805 if (IS_ERR(d_tracer)) { 5806 err = PTR_ERR(d_tracer); 5807 goto err; 5808 } 5809 5810 entry = tracefs_create_file("synthetic_events", 0644, d_tracer, 5811 NULL, &synth_events_fops); 5812 if (!entry) { 5813 err = -ENODEV; 5814 goto err; 5815 } 5816 5817 return err; 5818 err: 5819 pr_warn("Could not create tracefs 'synthetic_events' entry\n"); 5820 5821 return err; 5822 } 5823 5824 fs_initcall(trace_events_hist_init); 5825