tools/perf/util/probe-event.c

   1 /*
   2  * probe-event.c : perf-probe definition to kprobe_events format converter
   3  *
   4  * Written by Masami Hiramatsu <mhiramat@redhat.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  *
  20  */
  21
  22 #define _GNU_SOURCE
  23 #include <sys/utsname.h>
  24 #include <sys/types.h>
  25 #include <sys/stat.h>
  26 #include <fcntl.h>
  27 #include <errno.h>
  28 #include <stdio.h>
  29 #include <unistd.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <stdarg.h>
  33 #include <limits.h>
  34
  35 #undef _GNU_SOURCE
  36 #include "util.h"
  37 #include "event.h"
  38 #include "string.h"
  39 #include "strlist.h"
  40 #include "debug.h"
  41 #include "cache.h"
  42 #include "color.h"
  43 #include "symbol.h"
  44 #include "thread.h"
  45 #include "debugfs.h"
  46 #include "trace-event.h"        /* For __unused */
  47 #include "probe-event.h"
  48 #include "probe-finder.h"
  49
  50 #define MAX_CMDLEN 256
  51 #define MAX_PROBE_ARGS 128
  52 #define PERFPROBE_GROUP "probe"
  53
  54 bool probe_event_dry_run;       /* Dry run flag */
  55
  56 #define semantic_error(msg ...) pr_err("Semantic error :" msg)
  57
  58 /* If there is no space to write, returns -E2BIG. */
  59 static int e_snprintf(char *str, size_t size, const char *format, ...)
  60         __attribute__((format(printf, 3, 4)));
  61
  62 static int e_snprintf(char *str, size_t size, const char *format, ...)
  63 {
  64         int ret;
  65         va_list ap;
  66         va_start(ap, format);
  67         ret = vsnprintf(str, size, format, ap);
  68         va_end(ap);
  69         if (ret >= (int)size)
  70                 ret = -E2BIG;
  71         return ret;
  72 }
  73
  74 static char *synthesize_perf_probe_point(struct perf_probe_point *pp);
  75 static struct machine machine;
  76
  77 /* Initialize symbol maps and path of vmlinux */
  78 static int init_vmlinux(void)
  79 {
  80         struct dso *kernel;
  81         int ret;
  82
  83         symbol_conf.sort_by_name = true;
  84         if (symbol_conf.vmlinux_name == NULL)
  85                 symbol_conf.try_vmlinux_path = true;
  86         else
  87                 pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name);
  88         ret = symbol__init();
  89         if (ret < 0) {
  90                 pr_debug("Failed to init symbol map.\n");
  91                 goto out;
  92         }
  93
  94         ret = machine__init(&machine, "/", 0);
  95         if (ret < 0)
  96                 goto out;
  97
  98         kernel = dso__new_kernel(symbol_conf.vmlinux_name);
  99         if (kernel == NULL)
 100                 die("Failed to create kernel dso.");
 101
 102         ret = __machine__create_kernel_maps(&machine, kernel);
 103         if (ret < 0)
 104                 pr_debug("Failed to create kernel maps.\n");
 105
 106 out:
 107         if (ret < 0)
 108                 pr_warning("Failed to init vmlinux path.\n");
 109         return ret;
 110 }
 111
 112 #ifdef DWARF_SUPPORT
 113 static int open_vmlinux(void)
 114 {
 115         if (map__load(machine.vmlinux_maps[MAP__FUNCTION], NULL) < 0) {
 116                 pr_debug("Failed to load kernel map.\n");
 117                 return -EINVAL;
 118         }
 119         pr_debug("Try to open %s\n", machine.vmlinux_maps[MAP__FUNCTION]->dso->long_name);
 120         return open(machine.vmlinux_maps[MAP__FUNCTION]->dso->long_name, O_RDONLY);
 121 }
 122
 123 /* Convert trace point to probe point with debuginfo */
 124 static int convert_to_perf_probe_point(struct kprobe_trace_point *tp,
 125                                        struct perf_probe_point *pp)
 126 {
 127         struct symbol *sym;
 128         int fd, ret = -ENOENT;
 129
 130         sym = map__find_symbol_by_name(machine.vmlinux_maps[MAP__FUNCTION],
 131                                        tp->symbol, NULL);
 132         if (sym) {
 133                 fd = open_vmlinux();
 134                 if (fd >= 0) {
 135                         ret = find_perf_probe_point(fd,
 136                                                  sym->start + tp->offset, pp);
 137                         close(fd);
 138                 }
 139         }
 140         if (ret <= 0) {
 141                 pr_debug("Failed to find corresponding probes from "
 142                          "debuginfo. Use kprobe event information.\n");
 143                 pp->function = strdup(tp->symbol);
 144                 if (pp->function == NULL)
 145                         return -ENOMEM;
 146                 pp->offset = tp->offset;
 147         }
 148         pp->retprobe = tp->retprobe;
 149
 150         return 0;
 151 }
 152
 153 /* Try to find perf_probe_event with debuginfo */
 154 static int try_to_find_kprobe_trace_events(struct perf_probe_event *pev,
 155                                            struct kprobe_trace_event **tevs,
 156                                            int max_tevs)
 157 {
 158         bool need_dwarf = perf_probe_event_need_dwarf(pev);
 159         int fd, ntevs;
 160
 161         fd = open_vmlinux();
 162         if (fd < 0) {
 163                 if (need_dwarf) {
 164                         pr_warning("Failed to open debuginfo file.\n");
 165                         return fd;
 166                 }
 167                 pr_debug("Could not open vmlinux. Try to use symbols.\n");
 168                 return 0;
 169         }
 170
 171         /* Searching trace events corresponding to probe event */
 172         ntevs = find_kprobe_trace_events(fd, pev, tevs, max_tevs);
 173         close(fd);
 174
 175         if (ntevs > 0) {        /* Succeeded to find trace events */
 176                 pr_debug("find %d kprobe_trace_events.\n", ntevs);
 177                 return ntevs;
 178         }
 179
 180         if (ntevs == 0) {       /* No error but failed to find probe point. */
 181                 pr_warning("Probe point '%s' not found.\n",
 182                            synthesize_perf_probe_point(&pev->point));
 183                 return -ENOENT;
 184         }
 185         /* Error path : ntevs < 0 */
 186         pr_debug("An error occurred in debuginfo analysis (%d).\n", ntevs);
 187         if (ntevs == -EBADF) {
 188                 pr_warning("Warning: No dwarf info found in the vmlinux - "
 189                         "please rebuild kernel with CONFIG_DEBUG_INFO=y.\n");
 190                 if (!need_dwarf) {
 191                         pr_debug("Trying to use symbols.\nn");
 192                         return 0;
 193                 }
 194         }
 195         return ntevs;
 196 }
 197
 198 #define LINEBUF_SIZE 256
 199 #define NR_ADDITIONAL_LINES 2
 200
 201 static int show_one_line(FILE *fp, int l, bool skip, bool show_num)
 202 {
 203         char buf[LINEBUF_SIZE];
 204         const char *color = PERF_COLOR_BLUE;
 205
 206         if (fgets(buf, LINEBUF_SIZE, fp) == NULL)
 207                 goto error;
 208         if (!skip) {
 209                 if (show_num)
 210                         fprintf(stdout, "%7d  %s", l, buf);
 211                 else
 212                         color_fprintf(stdout, color, "         %s", buf);
 213         }
 214
 215         while (strlen(buf) == LINEBUF_SIZE - 1 &&
 216                buf[LINEBUF_SIZE - 2] != '\n') {
 217                 if (fgets(buf, LINEBUF_SIZE, fp) == NULL)
 218                         goto error;
 219                 if (!skip) {
 220                         if (show_num)
 221                                 fprintf(stdout, "%s", buf);
 222                         else
 223                                 color_fprintf(stdout, color, "%s", buf);
 224                 }
 225         }
 226
 227         return 0;
 228 error:
 229         if (feof(fp))
 230                 pr_warning("Source file is shorter than expected.\n");
 231         else
 232                 pr_warning("File read error: %s\n", strerror(errno));
 233
 234         return -1;
 235 }
 236
 237 /*
 238  * Show line-range always requires debuginfo to find source file and
 239  * line number.
 240  */
 241 int show_line_range(struct line_range *lr)
 242 {
 243         int l = 1;
 244         struct line_node *ln;
 245         FILE *fp;
 246         int fd, ret;
 247
 248         /* Search a line range */
 249         ret = init_vmlinux();
 250         if (ret < 0)
 251                 return ret;
 252
 253         fd = open_vmlinux();
 254         if (fd < 0) {
 255                 pr_warning("Failed to open debuginfo file.\n");
 256                 return fd;
 257         }
 258
 259         ret = find_line_range(fd, lr);
 260         close(fd);
 261         if (ret == 0) {
 262                 pr_warning("Specified source line is not found.\n");
 263                 return -ENOENT;
 264         } else if (ret < 0) {
 265                 pr_warning("Debuginfo analysis failed. (%d)\n", ret);
 266                 return ret;
 267         }
 268
 269         setup_pager();
 270
 271         if (lr->function)
 272                 fprintf(stdout, "<%s:%d>\n", lr->function,
 273                         lr->start - lr->offset);
 274         else
 275                 fprintf(stdout, "<%s:%d>\n", lr->file, lr->start);
 276
 277         fp = fopen(lr->path, "r");
 278         if (fp == NULL) {
 279                 pr_warning("Failed to open %s: %s\n", lr->path,
 280                            strerror(errno));
 281                 return -errno;
 282         }
 283         /* Skip to starting line number */
 284         while (l < lr->start && ret >= 0)
 285                 ret = show_one_line(fp, l++, true, false);
 286         if (ret < 0)
 287                 goto end;
 288
 289         list_for_each_entry(ln, &lr->line_list, list) {
 290                 while (ln->line > l && ret >= 0)
 291                         ret = show_one_line(fp, (l++) - lr->offset,
 292                                             false, false);
 293                 if (ret >= 0)
 294                         ret = show_one_line(fp, (l++) - lr->offset,
 295                                             false, true);
 296                 if (ret < 0)
 297                         goto end;
 298         }
 299
 300         if (lr->end == INT_MAX)
 301                 lr->end = l + NR_ADDITIONAL_LINES;
 302         while (l <= lr->end && !feof(fp) && ret >= 0)
 303                 ret = show_one_line(fp, (l++) - lr->offset, false, false);
 304 end:
 305         fclose(fp);
 306         return ret;
 307 }
 308
 309 #else   /* !DWARF_SUPPORT */
 310
 311 static int convert_to_perf_probe_point(struct kprobe_trace_point *tp,
 312                                         struct perf_probe_point *pp)
 313 {
 314         pp->function = strdup(tp->symbol);
 315         if (pp->function == NULL)
 316                 return -ENOMEM;
 317         pp->offset = tp->offset;
 318         pp->retprobe = tp->retprobe;
 319
 320         return 0;
 321 }
 322
 323 static int try_to_find_kprobe_trace_events(struct perf_probe_event *pev,
 324                                 struct kprobe_trace_event **tevs __unused,
 325                                 int max_tevs __unused)
 326 {
 327         if (perf_probe_event_need_dwarf(pev)) {
 328                 pr_warning("Debuginfo-analysis is not supported.\n");
 329                 return -ENOSYS;
 330         }
 331         return 0;
 332 }
 333
 334 int show_line_range(struct line_range *lr __unused)
 335 {
 336         pr_warning("Debuginfo-analysis is not supported.\n");
 337         return -ENOSYS;
 338 }
 339
 340 #endif
 341
 342 int parse_line_range_desc(const char *arg, struct line_range *lr)
 343 {
 344         const char *ptr;
 345         char *tmp;
 346         /*
 347          * <Syntax>
 348          * SRC:SLN[+NUM|-ELN]
 349          * FUNC[:SLN[+NUM|-ELN]]
 350          */
 351         ptr = strchr(arg, ':');
 352         if (ptr) {
 353                 lr->start = (int)strtoul(ptr + 1, &tmp, 0);
 354                 if (*tmp == '+') {
 355                         lr->end = lr->start + (int)strtoul(tmp + 1, &tmp, 0);
 356                         lr->end--;      /*
 357                                          * Adjust the number of lines here.
 358                                          * If the number of lines == 1, the
 359                                          * the end of line should be equal to
 360                                          * the start of line.
 361                                          */
 362                 } else if (*tmp == '-')
 363                         lr->end = (int)strtoul(tmp + 1, &tmp, 0);
 364                 else
 365                         lr->end = INT_MAX;
 366                 pr_debug("Line range is %d to %d\n", lr->start, lr->end);
 367                 if (lr->start > lr->end) {
 368                         semantic_error("Start line must be smaller"
 369                                        " than end line.\n");
 370                         return -EINVAL;
 371                 }
 372                 if (*tmp != '\0') {
 373                         semantic_error("Tailing with invalid character '%d'.\n",
 374                                        *tmp);
 375                         return -EINVAL;
 376                 }
 377                 tmp = strndup(arg, (ptr - arg));
 378         } else {
 379                 tmp = strdup(arg);
 380                 lr->end = INT_MAX;
 381         }
 382
 383         if (tmp == NULL)
 384                 return -ENOMEM;
 385
 386         if (strchr(tmp, '.'))
 387                 lr->file = tmp;
 388         else
 389                 lr->function = tmp;
 390
 391         return 0;
 392 }
 393
 394 /* Check the name is good for event/group */
 395 static bool check_event_name(const char *name)
 396 {
 397         if (!isalpha(*name) && *name != '_')
 398                 return false;
 399         while (*++name != '\0') {
 400                 if (!isalpha(*name) && !isdigit(*name) && *name != '_')
 401                         return false;
 402         }
 403         return true;
 404 }
 405
 406 /* Parse probepoint definition. */
 407 static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
 408 {
 409         struct perf_probe_point *pp = &pev->point;
 410         char *ptr, *tmp;
 411         char c, nc = 0;
 412         /*
 413          * <Syntax>
 414          * perf probe [EVENT=]SRC[:LN|;PTN]
 415          * perf probe [EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT]
 416          *
 417          * TODO:Group name support
 418          */
 419
 420         ptr = strpbrk(arg, ";=@+%");
 421         if (ptr && *ptr == '=') {       /* Event name */
 422                 *ptr = '\0';
 423                 tmp = ptr + 1;
 424                 if (strchr(arg, ':')) {
 425                         semantic_error("Group name is not supported yet.\n");
 426                         return -ENOTSUP;
 427                 }
 428                 if (!check_event_name(arg)) {
 429                         semantic_error("%s is bad for event name -it must "
 430                                        "follow C symbol-naming rule.\n", arg);
 431                         return -EINVAL;
 432                 }
 433                 pev->event = strdup(arg);
 434                 if (pev->event == NULL)
 435                         return -ENOMEM;
 436                 pev->group = NULL;
 437                 arg = tmp;
 438         }
 439
 440         ptr = strpbrk(arg, ";:+@%");
 441         if (ptr) {
 442                 nc = *ptr;
 443                 *ptr++ = '\0';
 444         }
 445
 446         tmp = strdup(arg);
 447         if (tmp == NULL)
 448                 return -ENOMEM;
 449
 450         /* Check arg is function or file and copy it */
 451         if (strchr(tmp, '.'))   /* File */
 452                 pp->file = tmp;
 453         else                    /* Function */
 454                 pp->function = tmp;
 455
 456         /* Parse other options */
 457         while (ptr) {
 458                 arg = ptr;
 459                 c = nc;
 460                 if (c == ';') { /* Lazy pattern must be the last part */
 461                         pp->lazy_line = strdup(arg);
 462                         if (pp->lazy_line == NULL)
 463                                 return -ENOMEM;
 464                         break;
 465                 }
 466                 ptr = strpbrk(arg, ";:+@%");
 467                 if (ptr) {
 468                         nc = *ptr;
 469                         *ptr++ = '\0';
 470                 }
 471                 switch (c) {
 472                 case ':':       /* Line number */
 473                         pp->line = strtoul(arg, &tmp, 0);
 474                         if (*tmp != '\0') {
 475                                 semantic_error("There is non-digit char"
 476                                                " in line number.\n");
 477                                 return -EINVAL;
 478                         }
 479                         break;
 480                 case '+':       /* Byte offset from a symbol */
 481                         pp->offset = strtoul(arg, &tmp, 0);
 482                         if (*tmp != '\0') {
 483                                 semantic_error("There is non-digit character"
 484                                                 " in offset.\n");
 485                                 return -EINVAL;
 486                         }
 487                         break;
 488                 case '@':       /* File name */
 489                         if (pp->file) {
 490                                 semantic_error("SRC@SRC is not allowed.\n");
 491                                 return -EINVAL;
 492                         }
 493                         pp->file = strdup(arg);
 494                         if (pp->file == NULL)
 495                                 return -ENOMEM;
 496                         break;
 497                 case '%':       /* Probe places */
 498                         if (strcmp(arg, "return") == 0) {
 499                                 pp->retprobe = 1;
 500                         } else {        /* Others not supported yet */
 501                                 semantic_error("%%%s is not supported.\n", arg);
 502                                 return -ENOTSUP;
 503                         }
 504                         break;
 505                 default:        /* Buggy case */
 506                         pr_err("This program has a bug at %s:%d.\n",
 507                                 __FILE__, __LINE__);
 508                         return -ENOTSUP;
 509                         break;
 510                 }
 511         }
 512
 513         /* Exclusion check */
 514         if (pp->lazy_line && pp->line) {
 515                 semantic_error("Lazy pattern can't be used with line number.");
 516                 return -EINVAL;
 517         }
 518
 519         if (pp->lazy_line && pp->offset) {
 520                 semantic_error("Lazy pattern can't be used with offset.");
 521                 return -EINVAL;
 522         }
 523
 524         if (pp->line && pp->offset) {
 525                 semantic_error("Offset can't be used with line number.");
 526                 return -EINVAL;
 527         }
 528
 529         if (!pp->line && !pp->lazy_line && pp->file && !pp->function) {
 530                 semantic_error("File always requires line number or "
 531                                "lazy pattern.");
 532                 return -EINVAL;
 533         }
 534
 535         if (pp->offset && !pp->function) {
 536                 semantic_error("Offset requires an entry function.");
 537                 return -EINVAL;
 538         }
 539
 540         if (pp->retprobe && !pp->function) {
 541                 semantic_error("Return probe requires an entry function.");
 542                 return -EINVAL;
 543         }
 544
 545         if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) {
 546                 semantic_error("Offset/Line/Lazy pattern can't be used with "
 547                                "return probe.");
 548                 return -EINVAL;
 549         }
 550
 551         pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n",
 552                  pp->function, pp->file, pp->line, pp->offset, pp->retprobe,
 553                  pp->lazy_line);
 554         return 0;
 555 }
 556
 557 /* Parse perf-probe event argument */
 558 static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg)
 559 {
 560         char *tmp;
 561         struct perf_probe_arg_field **fieldp;
 562
 563         pr_debug("parsing arg: %s into ", str);
 564
 565         tmp = strchr(str, '=');
 566         if (tmp) {
 567                 arg->name = strndup(str, tmp - str);
 568                 if (arg->name == NULL)
 569                         return -ENOMEM;
 570                 pr_debug("name:%s ", arg->name);
 571                 str = tmp + 1;
 572         }
 573
 574         tmp = strchr(str, ':');
 575         if (tmp) {      /* Type setting */
 576                 *tmp = '\0';
 577                 arg->type = strdup(tmp + 1);
 578                 if (arg->type == NULL)
 579                         return -ENOMEM;
 580                 pr_debug("type:%s ", arg->type);
 581         }
 582
 583         tmp = strpbrk(str, "-.");
 584         if (!is_c_varname(str) || !tmp) {
 585                 /* A variable, register, symbol or special value */
 586                 arg->var = strdup(str);
 587                 if (arg->var == NULL)
 588                         return -ENOMEM;
 589                 pr_debug("%s\n", arg->var);
 590                 return 0;
 591         }
 592
 593         /* Structure fields */
 594         arg->var = strndup(str, tmp - str);
 595         if (arg->var == NULL)
 596                 return -ENOMEM;
 597         pr_debug("%s, ", arg->var);
 598         fieldp = &arg->field;
 599
 600         do {
 601                 *fieldp = zalloc(sizeof(struct perf_probe_arg_field));
 602                 if (*fieldp == NULL)
 603                         return -ENOMEM;
 604                 if (*tmp == '.') {
 605                         str = tmp + 1;
 606                         (*fieldp)->ref = false;
 607                 } else if (tmp[1] == '>') {
 608                         str = tmp + 2;
 609                         (*fieldp)->ref = true;
 610                 } else {
 611                         semantic_error("Argument parse error: %s\n", str);
 612                         return -EINVAL;
 613                 }
 614
 615                 tmp = strpbrk(str, "-.");
 616                 if (tmp) {
 617                         (*fieldp)->name = strndup(str, tmp - str);
 618                         if ((*fieldp)->name == NULL)
 619                                 return -ENOMEM;
 620                         pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref);
 621                         fieldp = &(*fieldp)->next;
 622                 }
 623         } while (tmp);
 624         (*fieldp)->name = strdup(str);
 625         if ((*fieldp)->name == NULL)
 626                 return -ENOMEM;
 627         pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref);
 628
 629         /* If no name is specified, set the last field name */
 630         if (!arg->name) {
 631                 arg->name = strdup((*fieldp)->name);
 632                 if (arg->name == NULL)
 633                         return -ENOMEM;
 634         }
 635         return 0;
 636 }
 637
 638 /* Parse perf-probe event command */
 639 int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev)
 640 {
 641         char **argv;
 642         int argc, i, ret = 0;
 643
 644         argv = argv_split(cmd, &argc);
 645         if (!argv) {
 646                 pr_debug("Failed to split arguments.\n");
 647                 return -ENOMEM;
 648         }
 649         if (argc - 1 > MAX_PROBE_ARGS) {
 650                 semantic_error("Too many probe arguments (%d).\n", argc - 1);
 651                 ret = -ERANGE;
 652                 goto out;
 653         }
 654         /* Parse probe point */
 655         ret = parse_perf_probe_point(argv[0], pev);
 656         if (ret < 0)
 657                 goto out;
 658
 659         /* Copy arguments and ensure return probe has no C argument */
 660         pev->nargs = argc - 1;
 661         pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
 662         if (pev->args == NULL) {
 663                 ret = -ENOMEM;
 664                 goto out;
 665         }
 666         for (i = 0; i < pev->nargs && ret >= 0; i++) {
 667                 ret = parse_perf_probe_arg(argv[i + 1], &pev->args[i]);
 668                 if (ret >= 0 &&
 669                     is_c_varname(pev->args[i].var) && pev->point.retprobe) {
 670                         semantic_error("You can't specify local variable for"
 671                                        " kretprobe.\n");
 672                         ret = -EINVAL;
 673                 }
 674         }
 675 out:
 676         argv_free(argv);
 677
 678         return ret;
 679 }
 680
 681 /* Return true if this perf_probe_event requires debuginfo */
 682 bool perf_probe_event_need_dwarf(struct perf_probe_event *pev)
 683 {
 684         int i;
 685
 686         if (pev->point.file || pev->point.line || pev->point.lazy_line)
 687                 return true;
 688
 689         for (i = 0; i < pev->nargs; i++)
 690                 if (is_c_varname(pev->args[i].var))
 691                         return true;
 692
 693         return false;
 694 }
 695
 696 /* Parse kprobe_events event into struct probe_point */
 697 int parse_kprobe_trace_command(const char *cmd, struct kprobe_trace_event *tev)
 698 {
 699         struct kprobe_trace_point *tp = &tev->point;
 700         char pr;
 701         char *p;
 702         int ret, i, argc;
 703         char **argv;
 704
 705         pr_debug("Parsing kprobe_events: %s\n", cmd);
 706         argv = argv_split(cmd, &argc);
 707         if (!argv) {
 708                 pr_debug("Failed to split arguments.\n");
 709                 return -ENOMEM;
 710         }
 711         if (argc < 2) {
 712                 semantic_error("Too few probe arguments.\n");
 713                 ret = -ERANGE;
 714                 goto out;
 715         }
 716
 717         /* Scan event and group name. */
 718         ret = sscanf(argv[0], "%c:%a[^/ \t]/%a[^ \t]",
 719                      &pr, (float *)(void *)&tev->group,
 720                      (float *)(void *)&tev->event);
 721         if (ret != 3) {
 722                 semantic_error("Failed to parse event name: %s\n", argv[0]);
 723                 ret = -EINVAL;
 724                 goto out;
 725         }
 726         pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr);
 727
 728         tp->retprobe = (pr == 'r');
 729
 730         /* Scan function name and offset */
 731         ret = sscanf(argv[1], "%a[^+]+%lu", (float *)(void *)&tp->symbol,
 732                      &tp->offset);
 733         if (ret == 1)
 734                 tp->offset = 0;
 735
 736         tev->nargs = argc - 2;
 737         tev->args = zalloc(sizeof(struct kprobe_trace_arg) * tev->nargs);
 738         if (tev->args == NULL) {
 739                 ret = -ENOMEM;
 740                 goto out;
 741         }
 742         for (i = 0; i < tev->nargs; i++) {
 743                 p = strchr(argv[i + 2], '=');
 744                 if (p)  /* We don't need which register is assigned. */
 745                         *p++ = '\0';
 746                 else
 747                         p = argv[i + 2];
 748                 tev->args[i].name = strdup(argv[i + 2]);
 749                 /* TODO: parse regs and offset */
 750                 tev->args[i].value = strdup(p);
 751                 if (tev->args[i].name == NULL || tev->args[i].value == NULL) {
 752                         ret = -ENOMEM;
 753                         goto out;
 754                 }
 755         }
 756         ret = 0;
 757 out:
 758         argv_free(argv);
 759         return ret;
 760 }
 761
 762 /* Compose only probe arg */
 763 int synthesize_perf_probe_arg(struct perf_probe_arg *pa, char *buf, size_t len)
 764 {
 765         struct perf_probe_arg_field *field = pa->field;
 766         int ret;
 767         char *tmp = buf;
 768
 769         if (pa->name && pa->var)
 770                 ret = e_snprintf(tmp, len, "%s=%s", pa->name, pa->var);
 771         else
 772                 ret = e_snprintf(tmp, len, "%s", pa->name ? pa->name : pa->var);
 773         if (ret <= 0)
 774                 goto error;
 775         tmp += ret;
 776         len -= ret;
 777
 778         while (field) {
 779                 ret = e_snprintf(tmp, len, "%s%s", field->ref ? "->" : ".",
 780                                  field->name);
 781                 if (ret <= 0)
 782                         goto error;
 783                 tmp += ret;
 784                 len -= ret;
 785                 field = field->next;
 786         }
 787
 788         if (pa->type) {
 789                 ret = e_snprintf(tmp, len, ":%s", pa->type);
 790                 if (ret <= 0)
 791                         goto error;
 792                 tmp += ret;
 793                 len -= ret;
 794         }
 795
 796         return tmp - buf;
 797 error:
 798         pr_debug("Failed to synthesize perf probe argument: %s",
 799                  strerror(-ret));
 800         return ret;
 801 }
 802
 803 /* Compose only probe point (not argument) */
 804 static char *synthesize_perf_probe_point(struct perf_probe_point *pp)
 805 {
 806         char *buf, *tmp;
 807         char offs[32] = "", line[32] = "", file[32] = "";
 808         int ret, len;
 809
 810         buf = zalloc(MAX_CMDLEN);
 811         if (buf == NULL) {
 812                 ret = -ENOMEM;
 813                 goto error;
 814         }
 815         if (pp->offset) {
 816                 ret = e_snprintf(offs, 32, "+%lu", pp->offset);
 817                 if (ret <= 0)
 818                         goto error;
 819         }
 820         if (pp->line) {
 821                 ret = e_snprintf(line, 32, ":%d", pp->line);
 822                 if (ret <= 0)
 823                         goto error;
 824         }
 825         if (pp->file) {
 826                 len = strlen(pp->file) - 31;
 827                 if (len < 0)
 828                         len = 0;
 829                 tmp = strchr(pp->file + len, '/');
 830                 if (!tmp)
 831                         tmp = pp->file + len;
 832                 ret = e_snprintf(file, 32, "@%s", tmp + 1);
 833                 if (ret <= 0)
 834                         goto error;
 835         }
 836
 837         if (pp->function)
 838                 ret = e_snprintf(buf, MAX_CMDLEN, "%s%s%s%s%s", pp->function,
 839                                  offs, pp->retprobe ? "%return" : "", line,
 840                                  file);
 841         else
 842                 ret = e_snprintf(buf, MAX_CMDLEN, "%s%s", file, line);
 843         if (ret <= 0)
 844                 goto error;
 845
 846         return buf;
 847 error:
 848         pr_debug("Failed to synthesize perf probe point: %s",
 849                  strerror(-ret));
 850         if (buf)
 851                 free(buf);
 852         return NULL;
 853 }
 854
 855 #if 0
 856 char *synthesize_perf_probe_command(struct perf_probe_event *pev)
 857 {
 858         char *buf;
 859         int i, len, ret;
 860
 861         buf = synthesize_perf_probe_point(&pev->point);
 862         if (!buf)
 863                 return NULL;
 864
 865         len = strlen(buf);
 866         for (i = 0; i < pev->nargs; i++) {
 867                 ret = e_snprintf(&buf[len], MAX_CMDLEN - len, " %s",
 868                                  pev->args[i].name);
 869                 if (ret <= 0) {
 870                         free(buf);
 871                         return NULL;
 872                 }
 873                 len += ret;
 874         }
 875
 876         return buf;
 877 }
 878 #endif
 879
 880 static int __synthesize_kprobe_trace_arg_ref(struct kprobe_trace_arg_ref *ref,
 881                                              char **buf, size_t *buflen,
 882                                              int depth)
 883 {
 884         int ret;
 885         if (ref->next) {
 886                 depth = __synthesize_kprobe_trace_arg_ref(ref->next, buf,
 887                                                          buflen, depth + 1);
 888                 if (depth < 0)
 889                         goto out;
 890         }
 891
 892         ret = e_snprintf(*buf, *buflen, "%+ld(", ref->offset);
 893         if (ret < 0)
 894                 depth = ret;
 895         else {
 896                 *buf += ret;
 897                 *buflen -= ret;
 898         }
 899 out:
 900         return depth;
 901
 902 }
 903
 904 static int synthesize_kprobe_trace_arg(struct kprobe_trace_arg *arg,
 905                                        char *buf, size_t buflen)
 906 {
 907         int ret, depth = 0;
 908         char *tmp = buf;
 909
 910         /* Argument name or separator */
 911         if (arg->name)
 912                 ret = e_snprintf(buf, buflen, " %s=", arg->name);
 913         else
 914                 ret = e_snprintf(buf, buflen, " ");
 915         if (ret < 0)
 916                 return ret;
 917         buf += ret;
 918         buflen -= ret;
 919
 920         /* Dereferencing arguments */
 921         if (arg->ref) {
 922                 depth = __synthesize_kprobe_trace_arg_ref(arg->ref, &buf,
 923                                                           &buflen, 1);
 924                 if (depth < 0)
 925                         return depth;
 926         }
 927
 928         /* Print argument value */
 929         ret = e_snprintf(buf, buflen, "%s", arg->value);
 930         if (ret < 0)
 931                 return ret;
 932         buf += ret;
 933         buflen -= ret;
 934
 935         /* Closing */
 936         while (depth--) {
 937                 ret = e_snprintf(buf, buflen, ")");
 938                 if (ret < 0)
 939                         return ret;
 940                 buf += ret;
 941                 buflen -= ret;
 942         }
 943         /* Print argument type */
 944         if (arg->type) {
 945                 ret = e_snprintf(buf, buflen, ":%s", arg->type);
 946                 if (ret <= 0)
 947                         return ret;
 948                 buf += ret;
 949         }
 950
 951         return buf - tmp;
 952 }
 953
 954 char *synthesize_kprobe_trace_command(struct kprobe_trace_event *tev)
 955 {
 956         struct kprobe_trace_point *tp = &tev->point;
 957         char *buf;
 958         int i, len, ret;
 959
 960         buf = zalloc(MAX_CMDLEN);
 961         if (buf == NULL)
 962                 return NULL;
 963
 964         len = e_snprintf(buf, MAX_CMDLEN, "%c:%s/%s %s+%lu",
 965                          tp->retprobe ? 'r' : 'p',
 966                          tev->group, tev->event,
 967                          tp->symbol, tp->offset);
 968         if (len <= 0)
 969                 goto error;
 970
 971         for (i = 0; i < tev->nargs; i++) {
 972                 ret = synthesize_kprobe_trace_arg(&tev->args[i], buf + len,
 973                                                   MAX_CMDLEN - len);
 974                 if (ret <= 0)
 975                         goto error;
 976                 len += ret;
 977         }
 978
 979         return buf;
 980 error:
 981         free(buf);
 982         return NULL;
 983 }
 984
 985 int convert_to_perf_probe_event(struct kprobe_trace_event *tev,
 986                                 struct perf_probe_event *pev)
 987 {
 988         char buf[64] = "";
 989         int i, ret;
 990
 991         /* Convert event/group name */
 992         pev->event = strdup(tev->event);
 993         pev->group = strdup(tev->group);
 994         if (pev->event == NULL || pev->group == NULL)
 995                 return -ENOMEM;
 996
 997         /* Convert trace_point to probe_point */
 998         ret = convert_to_perf_probe_point(&tev->point, &pev->point);
 999         if (ret < 0)
1000                 return ret;
1001
1002         /* Convert trace_arg to probe_arg */
1003         pev->nargs = tev->nargs;
1004         pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
1005         if (pev->args == NULL)
1006                 return -ENOMEM;
1007         for (i = 0; i < tev->nargs && ret >= 0; i++) {
1008                 if (tev->args[i].name)
1009                         pev->args[i].name = strdup(tev->args[i].name);
1010                 else {
1011                         ret = synthesize_kprobe_trace_arg(&tev->args[i],
1012                                                           buf, 64);
1013                         pev->args[i].name = strdup(buf);
1014                 }
1015                 if (pev->args[i].name == NULL && ret >= 0)
1016                         ret = -ENOMEM;
1017         }
1018
1019         if (ret < 0)
1020                 clear_perf_probe_event(pev);
1021
1022         return ret;
1023 }
1024
1025 void clear_perf_probe_event(struct perf_probe_event *pev)
1026 {
1027         struct perf_probe_point *pp = &pev->point;
1028         struct perf_probe_arg_field *field, *next;
1029         int i;
1030
1031         if (pev->event)
1032                 free(pev->event);
1033         if (pev->group)
1034                 free(pev->group);
1035         if (pp->file)
1036                 free(pp->file);
1037         if (pp->function)
1038                 free(pp->function);
1039         if (pp->lazy_line)
1040                 free(pp->lazy_line);
1041         for (i = 0; i < pev->nargs; i++) {
1042                 if (pev->args[i].name)
1043                         free(pev->args[i].name);
1044                 if (pev->args[i].var)
1045                         free(pev->args[i].var);
1046                 if (pev->args[i].type)
1047                         free(pev->args[i].type);
1048                 field = pev->args[i].field;
1049                 while (field) {
1050                         next = field->next;
1051                         if (field->name)
1052                                 free(field->name);
1053                         free(field);
1054                         field = next;
1055                 }
1056         }
1057         if (pev->args)
1058                 free(pev->args);
1059         memset(pev, 0, sizeof(*pev));
1060 }
1061
1062 void clear_kprobe_trace_event(struct kprobe_trace_event *tev)
1063 {
1064         struct kprobe_trace_arg_ref *ref, *next;
1065         int i;
1066
1067         if (tev->event)
1068                 free(tev->event);
1069         if (tev->group)
1070                 free(tev->group);
1071         if (tev->point.symbol)
1072                 free(tev->point.symbol);
1073         for (i = 0; i < tev->nargs; i++) {
1074                 if (tev->args[i].name)
1075                         free(tev->args[i].name);
1076                 if (tev->args[i].value)
1077                         free(tev->args[i].value);
1078                 if (tev->args[i].type)
1079                         free(tev->args[i].type);
1080                 ref = tev->args[i].ref;
1081                 while (ref) {
1082                         next = ref->next;
1083                         free(ref);
1084                         ref = next;
1085                 }
1086         }
1087         if (tev->args)
1088                 free(tev->args);
1089         memset(tev, 0, sizeof(*tev));
1090 }
1091
1092 static int open_kprobe_events(bool readwrite)
1093 {
1094         char buf[PATH_MAX];
1095         const char *__debugfs;
1096         int ret;
1097
1098         __debugfs = debugfs_find_mountpoint();
1099         if (__debugfs == NULL) {
1100                 pr_warning("Debugfs is not mounted.\n");
1101                 return -ENOENT;
1102         }
1103
1104         ret = e_snprintf(buf, PATH_MAX, "%stracing/kprobe_events", __debugfs);
1105         if (ret >= 0) {
1106                 pr_debug("Opening %s write=%d\n", buf, readwrite);
1107                 if (readwrite && !probe_event_dry_run)
1108                         ret = open(buf, O_RDWR, O_APPEND);
1109                 else
1110                         ret = open(buf, O_RDONLY, 0);
1111         }
1112
1113         if (ret < 0) {
1114                 if (errno == ENOENT)
1115                         pr_warning("kprobe_events file does not exist - please"
1116                                  " rebuild kernel with CONFIG_KPROBE_EVENT.\n");
1117                 else
1118                         pr_warning("Failed to open kprobe_events file: %s\n",
1119                                    strerror(errno));
1120         }
1121         return ret;
1122 }
1123
1124 /* Get raw string list of current kprobe_events */
1125 static struct strlist *get_kprobe_trace_command_rawlist(int fd)
1126 {
1127         int ret, idx;
1128         FILE *fp;
1129         char buf[MAX_CMDLEN];
1130         char *p;
1131         struct strlist *sl;
1132
1133         sl = strlist__new(true, NULL);
1134
1135         fp = fdopen(dup(fd), "r");
1136         while (!feof(fp)) {
1137                 p = fgets(buf, MAX_CMDLEN, fp);
1138                 if (!p)
1139                         break;
1140
1141                 idx = strlen(p) - 1;
1142                 if (p[idx] == '\n')
1143                         p[idx] = '\0';
1144                 ret = strlist__add(sl, buf);
1145                 if (ret < 0) {
1146                         pr_debug("strlist__add failed: %s\n", strerror(-ret));
1147                         strlist__delete(sl);
1148                         return NULL;
1149                 }
1150         }
1151         fclose(fp);
1152
1153         return sl;
1154 }
1155
1156 /* Show an event */
1157 static int show_perf_probe_event(struct perf_probe_event *pev)
1158 {
1159         int i, ret;
1160         char buf[128];
1161         char *place;
1162
1163         /* Synthesize only event probe point */
1164         place = synthesize_perf_probe_point(&pev->point);
1165         if (!place)
1166                 return -EINVAL;
1167
1168         ret = e_snprintf(buf, 128, "%s:%s", pev->group, pev->event);
1169         if (ret < 0)
1170                 return ret;
1171
1172         printf("  %-20s (on %s", buf, place);
1173
1174         if (pev->nargs > 0) {
1175                 printf(" with");
1176                 for (i = 0; i < pev->nargs; i++) {
1177                         ret = synthesize_perf_probe_arg(&pev->args[i],
1178                                                         buf, 128);
1179                         if (ret < 0)
1180                                 break;
1181                         printf(" %s", buf);
1182                 }
1183         }
1184         printf(")\n");
1185         free(place);
1186         return ret;
1187 }
1188
1189 /* List up current perf-probe events */
1190 int show_perf_probe_events(void)
1191 {
1192         int fd, ret;
1193         struct kprobe_trace_event tev;
1194         struct perf_probe_event pev;
1195         struct strlist *rawlist;
1196         struct str_node *ent;
1197
1198         setup_pager();
1199         ret = init_vmlinux();
1200         if (ret < 0)
1201                 return ret;
1202
1203         memset(&tev, 0, sizeof(tev));
1204         memset(&pev, 0, sizeof(pev));
1205
1206         fd = open_kprobe_events(false);
1207         if (fd < 0)
1208                 return fd;
1209
1210         rawlist = get_kprobe_trace_command_rawlist(fd);
1211         close(fd);
1212         if (!rawlist)
1213                 return -ENOENT;
1214
1215         strlist__for_each(ent, rawlist) {
1216                 ret = parse_kprobe_trace_command(ent->s, &tev);
1217                 if (ret >= 0) {
1218                         ret = convert_to_perf_probe_event(&tev, &pev);
1219                         if (ret >= 0)
1220                                 ret = show_perf_probe_event(&pev);
1221                 }
1222                 clear_perf_probe_event(&pev);
1223                 clear_kprobe_trace_event(&tev);
1224                 if (ret < 0)
1225                         break;
1226         }
1227         strlist__delete(rawlist);
1228
1229         return ret;
1230 }
1231
1232 /* Get current perf-probe event names */
1233 static struct strlist *get_kprobe_trace_event_names(int fd, bool include_group)
1234 {
1235         char buf[128];
1236         struct strlist *sl, *rawlist;
1237         struct str_node *ent;
1238         struct kprobe_trace_event tev;
1239         int ret = 0;
1240
1241         memset(&tev, 0, sizeof(tev));
1242
1243         rawlist = get_kprobe_trace_command_rawlist(fd);
1244         sl = strlist__new(true, NULL);
1245         strlist__for_each(ent, rawlist) {
1246                 ret = parse_kprobe_trace_command(ent->s, &tev);
1247                 if (ret < 0)
1248                         break;
1249                 if (include_group) {
1250                         ret = e_snprintf(buf, 128, "%s:%s", tev.group,
1251                                         tev.event);
1252                         if (ret >= 0)
1253                                 ret = strlist__add(sl, buf);
1254                 } else
1255                         ret = strlist__add(sl, tev.event);
1256                 clear_kprobe_trace_event(&tev);
1257                 if (ret < 0)
1258                         break;
1259         }
1260         strlist__delete(rawlist);
1261
1262         if (ret < 0) {
1263                 strlist__delete(sl);
1264                 return NULL;
1265         }
1266         return sl;
1267 }
1268
1269 static int write_kprobe_trace_event(int fd, struct kprobe_trace_event *tev)
1270 {
1271         int ret = 0;
1272         char *buf = synthesize_kprobe_trace_command(tev);
1273
1274         if (!buf) {
1275                 pr_debug("Failed to synthesize kprobe trace event.\n");
1276                 return -EINVAL;
1277         }
1278
1279         pr_debug("Writing event: %s\n", buf);
1280         if (!probe_event_dry_run) {
1281                 ret = write(fd, buf, strlen(buf));
1282                 if (ret <= 0)
1283                         pr_warning("Failed to write event: %s\n",
1284                                    strerror(errno));
1285         }
1286         free(buf);
1287         return ret;
1288 }
1289
1290 static int get_new_event_name(char *buf, size_t len, const char *base,
1291                               struct strlist *namelist, bool allow_suffix)
1292 {
1293         int i, ret;
1294
1295         /* Try no suffix */
1296         ret = e_snprintf(buf, len, "%s", base);
1297         if (ret < 0) {
1298                 pr_debug("snprintf() failed: %s\n", strerror(-ret));
1299                 return ret;
1300         }
1301         if (!strlist__has_entry(namelist, buf))
1302                 return 0;
1303
1304         if (!allow_suffix) {
1305                 pr_warning("Error: event \"%s\" already exists. "
1306                            "(Use -f to force duplicates.)\n", base);
1307                 return -EEXIST;
1308         }
1309
1310         /* Try to add suffix */
1311         for (i = 1; i < MAX_EVENT_INDEX; i++) {
1312                 ret = e_snprintf(buf, len, "%s_%d", base, i);
1313                 if (ret < 0) {
1314                         pr_debug("snprintf() failed: %s\n", strerror(-ret));
1315                         return ret;
1316                 }
1317                 if (!strlist__has_entry(namelist, buf))
1318                         break;
1319         }
1320         if (i == MAX_EVENT_INDEX) {
1321                 pr_warning("Too many events are on the same function.\n");
1322                 ret = -ERANGE;
1323         }
1324
1325         return ret;
1326 }
1327
1328 static int __add_kprobe_trace_events(struct perf_probe_event *pev,
1329                                      struct kprobe_trace_event *tevs,
1330                                      int ntevs, bool allow_suffix)
1331 {
1332         int i, fd, ret;
1333         struct kprobe_trace_event *tev = NULL;
1334         char buf[64];
1335         const char *event, *group;
1336         struct strlist *namelist;
1337
1338         fd = open_kprobe_events(true);
1339         if (fd < 0)
1340                 return fd;
1341         /* Get current event names */
1342         namelist = get_kprobe_trace_event_names(fd, false);
1343         if (!namelist) {
1344                 pr_debug("Failed to get current event list.\n");
1345                 return -EIO;
1346         }
1347
1348         ret = 0;
1349         printf("Add new event%s\n", (ntevs > 1) ? "s:" : ":");
1350         for (i = 0; i < ntevs; i++) {
1351                 tev = &tevs[i];
1352                 if (pev->event)
1353                         event = pev->event;
1354                 else
1355                         if (pev->point.function)
1356                                 event = pev->point.function;
1357                         else
1358                                 event = tev->point.symbol;
1359                 if (pev->group)
1360                         group = pev->group;
1361                 else
1362                         group = PERFPROBE_GROUP;
1363
1364                 /* Get an unused new event name */
1365                 ret = get_new_event_name(buf, 64, event,
1366                                          namelist, allow_suffix);
1367                 if (ret < 0)
1368                         break;
1369                 event = buf;
1370
1371                 tev->event = strdup(event);
1372                 tev->group = strdup(group);
1373                 if (tev->event == NULL || tev->group == NULL) {
1374                         ret = -ENOMEM;
1375                         break;
1376                 }
1377                 ret = write_kprobe_trace_event(fd, tev);
1378                 if (ret < 0)
1379                         break;
1380                 /* Add added event name to namelist */
1381                 strlist__add(namelist, event);
1382
1383                 /* Trick here - save current event/group */
1384                 event = pev->event;
1385                 group = pev->group;
1386                 pev->event = tev->event;
1387                 pev->group = tev->group;
1388                 show_perf_probe_event(pev);
1389                 /* Trick here - restore current event/group */
1390                 pev->event = (char *)event;
1391                 pev->group = (char *)group;
1392
1393                 /*
1394                  * Probes after the first probe which comes from same
1395                  * user input are always allowed to add suffix, because
1396                  * there might be several addresses corresponding to
1397                  * one code line.
1398                  */
1399                 allow_suffix = true;
1400         }
1401
1402         if (ret >= 0) {
1403                 /* Show how to use the event. */
1404                 printf("\nYou can now use it on all perf tools, such as:\n\n");
1405                 printf("\tperf record -e %s:%s -aR sleep 1\n\n", tev->group,
1406                          tev->event);
1407         }
1408
1409         strlist__delete(namelist);
1410         close(fd);
1411         return ret;
1412 }
1413
1414 static int convert_to_kprobe_trace_events(struct perf_probe_event *pev,
1415                                           struct kprobe_trace_event **tevs,
1416                                           int max_tevs)
1417 {
1418         struct symbol *sym;
1419         int ret = 0, i;
1420         struct kprobe_trace_event *tev;
1421
1422         /* Convert perf_probe_event with debuginfo */
1423         ret = try_to_find_kprobe_trace_events(pev, tevs, max_tevs);
1424         if (ret != 0)
1425                 return ret;
1426
1427         /* Allocate trace event buffer */
1428         tev = *tevs = zalloc(sizeof(struct kprobe_trace_event));
1429         if (tev == NULL)
1430                 return -ENOMEM;
1431
1432         /* Copy parameters */
1433         tev->point.symbol = strdup(pev->point.function);
1434         if (tev->point.symbol == NULL) {
1435                 ret = -ENOMEM;
1436                 goto error;
1437         }
1438         tev->point.offset = pev->point.offset;
1439         tev->nargs = pev->nargs;
1440         if (tev->nargs) {
1441                 tev->args = zalloc(sizeof(struct kprobe_trace_arg)
1442                                    * tev->nargs);
1443                 if (tev->args == NULL) {
1444                         ret = -ENOMEM;
1445                         goto error;
1446                 }
1447                 for (i = 0; i < tev->nargs; i++) {
1448                         if (pev->args[i].name) {
1449                                 tev->args[i].name = strdup(pev->args[i].name);
1450                                 if (tev->args[i].name == NULL) {
1451                                         ret = -ENOMEM;
1452                                         goto error;
1453                                 }
1454                         }
1455                         tev->args[i].value = strdup(pev->args[i].var);
1456                         if (tev->args[i].value == NULL) {
1457                                 ret = -ENOMEM;
1458                                 goto error;
1459                         }
1460                         if (pev->args[i].type) {
1461                                 tev->args[i].type = strdup(pev->args[i].type);
1462                                 if (tev->args[i].type == NULL) {
1463                                         ret = -ENOMEM;
1464                                         goto error;
1465                                 }
1466                         }
1467                 }
1468         }
1469
1470         /* Currently just checking function name from symbol map */
1471         sym = map__find_symbol_by_name(machine.vmlinux_maps[MAP__FUNCTION],
1472                                        tev->point.symbol, NULL);
1473         if (!sym) {
1474                 pr_warning("Kernel symbol \'%s\' not found.\n",
1475                            tev->point.symbol);
1476                 ret = -ENOENT;
1477                 goto error;
1478         }
1479
1480         return 1;
1481 error:
1482         clear_kprobe_trace_event(tev);
1483         free(tev);
1484         *tevs = NULL;
1485         return ret;
1486 }
1487
1488 struct __event_package {
1489         struct perf_probe_event         *pev;
1490         struct kprobe_trace_event       *tevs;
1491         int                             ntevs;
1492 };
1493
1494 int add_perf_probe_events(struct perf_probe_event *pevs, int npevs,
1495                           bool force_add, int max_tevs)
1496 {
1497         int i, j, ret;
1498         struct __event_package *pkgs;
1499
1500         pkgs = zalloc(sizeof(struct __event_package) * npevs);
1501         if (pkgs == NULL)
1502                 return -ENOMEM;
1503
1504         /* Init vmlinux path */
1505         ret = init_vmlinux();
1506         if (ret < 0)
1507                 return ret;
1508
1509         /* Loop 1: convert all events */
1510         for (i = 0; i < npevs; i++) {
1511                 pkgs[i].pev = &pevs[i];
1512                 /* Convert with or without debuginfo */
1513                 ret  = convert_to_kprobe_trace_events(pkgs[i].pev,
1514                                                       &pkgs[i].tevs, max_tevs);
1515                 if (ret < 0)
1516                         goto end;
1517                 pkgs[i].ntevs = ret;
1518         }
1519
1520         /* Loop 2: add all events */
1521         for (i = 0; i < npevs && ret >= 0; i++)
1522                 ret = __add_kprobe_trace_events(pkgs[i].pev, pkgs[i].tevs,
1523                                                 pkgs[i].ntevs, force_add);
1524 end:
1525         /* Loop 3: cleanup trace events  */
1526         for (i = 0; i < npevs; i++)
1527                 for (j = 0; j < pkgs[i].ntevs; j++)
1528                         clear_kprobe_trace_event(&pkgs[i].tevs[j]);
1529
1530         return ret;
1531 }
1532
1533 static int __del_trace_kprobe_event(int fd, struct str_node *ent)
1534 {
1535         char *p;
1536         char buf[128];
1537         int ret;
1538
1539         /* Convert from perf-probe event to trace-kprobe event */
1540         ret = e_snprintf(buf, 128, "-:%s", ent->s);
1541         if (ret < 0)
1542                 goto error;
1543
1544         p = strchr(buf + 2, ':');
1545         if (!p) {
1546                 pr_debug("Internal error: %s should have ':' but not.\n",
1547                          ent->s);
1548                 ret = -ENOTSUP;
1549                 goto error;
1550         }
1551         *p = '/';
1552
1553         pr_debug("Writing event: %s\n", buf);
1554         ret = write(fd, buf, strlen(buf));
1555         if (ret < 0)
1556                 goto error;
1557
1558         printf("Remove event: %s\n", ent->s);
1559         return 0;
1560 error:
1561         pr_warning("Failed to delete event: %s\n", strerror(-ret));
1562         return ret;
1563 }
1564
1565 static int del_trace_kprobe_event(int fd, const char *group,
1566                                   const char *event, struct strlist *namelist)
1567 {
1568         char buf[128];
1569         struct str_node *ent, *n;
1570         int found = 0, ret = 0;
1571
1572         ret = e_snprintf(buf, 128, "%s:%s", group, event);
1573         if (ret < 0) {
1574                 pr_err("Failed to copy event.");
1575                 return ret;
1576         }
1577
1578         if (strpbrk(buf, "*?")) { /* Glob-exp */
1579                 strlist__for_each_safe(ent, n, namelist)
1580                         if (strglobmatch(ent->s, buf)) {
1581                                 found++;
1582                                 ret = __del_trace_kprobe_event(fd, ent);
1583                                 if (ret < 0)
1584                                         break;
1585                                 strlist__remove(namelist, ent);
1586                         }
1587         } else {
1588                 ent = strlist__find(namelist, buf);
1589                 if (ent) {
1590                         found++;
1591                         ret = __del_trace_kprobe_event(fd, ent);
1592                         if (ret >= 0)
1593                                 strlist__remove(namelist, ent);
1594                 }
1595         }
1596         if (found == 0 && ret >= 0)
1597                 pr_info("Info: Event \"%s\" does not exist.\n", buf);
1598
1599         return ret;
1600 }
1601
1602 int del_perf_probe_events(struct strlist *dellist)
1603 {
1604         int fd, ret = 0;
1605         const char *group, *event;
1606         char *p, *str;
1607         struct str_node *ent;
1608         struct strlist *namelist;
1609
1610         fd = open_kprobe_events(true);
1611         if (fd < 0)
1612                 return fd;
1613
1614         /* Get current event names */
1615         namelist = get_kprobe_trace_event_names(fd, true);
1616         if (namelist == NULL)
1617                 return -EINVAL;
1618
1619         strlist__for_each(ent, dellist) {
1620                 str = strdup(ent->s);
1621                 if (str == NULL) {
1622                         ret = -ENOMEM;
1623                         break;
1624                 }
1625                 pr_debug("Parsing: %s\n", str);
1626                 p = strchr(str, ':');
1627                 if (p) {
1628                         group = str;
1629                         *p = '\0';
1630                         event = p + 1;
1631                 } else {
1632                         group = "*";
1633                         event = str;
1634                 }
1635                 pr_debug("Group: %s, Event: %s\n", group, event);
1636                 ret = del_trace_kprobe_event(fd, group, event, namelist);
1637                 free(str);
1638                 if (ret < 0)
1639                         break;
1640         }
1641         strlist__delete(namelist);
1642         close(fd);
1643
1644         return ret;
1645 }
1646