tools/perf/util/bpf-loader.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * bpf-loader.c
   4  *
   5  * Copyright (C) 2015 Wang Nan <wangnan0@huawei.com>
   6  * Copyright (C) 2015 Huawei Inc.
   7  */
   8
   9 #include <linux/bpf.h>
  10 #include <bpf/libbpf.h>
  11 #include <bpf/bpf.h>
  12 #include <linux/err.h>
  13 #include <linux/kernel.h>
  14 #include <linux/string.h>
  15 #include <errno.h>
  16 #include "perf.h"
  17 #include "debug.h"
  18 #include "evlist.h"
  19 #include "bpf-loader.h"
  20 #include "bpf-prologue.h"
  21 #include "probe-event.h"
  22 #include "probe-finder.h" // for MAX_PROBES
  23 #include "parse-events.h"
  24 #include "strfilter.h"
  25 #include "llvm-utils.h"
  26 #include "c++/clang-c.h"
  27
  28 static int libbpf_perf_print(enum libbpf_print_level level __attribute__((unused)),
  29                               const char *fmt, va_list args)
  30 {
  31         return veprintf(1, verbose, pr_fmt(fmt), args);
  32 }
  33
  34 struct bpf_prog_priv {
  35         bool is_tp;
  36         char *sys_name;
  37         char *evt_name;
  38         struct perf_probe_event pev;
  39         bool need_prologue;
  40         struct bpf_insn *insns_buf;
  41         int nr_types;
  42         int *type_mapping;
  43 };
  44
  45 static bool libbpf_initialized;
  46
  47 struct bpf_object *
  48 bpf__prepare_load_buffer(void *obj_buf, size_t obj_buf_sz, const char *name)
  49 {
  50         struct bpf_object *obj;
  51
  52         if (!libbpf_initialized) {
  53                 libbpf_set_print(libbpf_perf_print);
  54                 libbpf_initialized = true;
  55         }
  56
  57         obj = bpf_object__open_buffer(obj_buf, obj_buf_sz, name);
  58         if (IS_ERR_OR_NULL(obj)) {
  59                 pr_debug("bpf: failed to load buffer\n");
  60                 return ERR_PTR(-EINVAL);
  61         }
  62
  63         return obj;
  64 }
  65
  66 struct bpf_object *bpf__prepare_load(const char *filename, bool source)
  67 {
  68         struct bpf_object *obj;
  69
  70         if (!libbpf_initialized) {
  71                 libbpf_set_print(libbpf_perf_print);
  72                 libbpf_initialized = true;
  73         }
  74
  75         if (source) {
  76                 int err;
  77                 void *obj_buf;
  78                 size_t obj_buf_sz;
  79
  80                 perf_clang__init();
  81                 err = perf_clang__compile_bpf(filename, &obj_buf, &obj_buf_sz);
  82                 perf_clang__cleanup();
  83                 if (err) {
  84                         pr_debug("bpf: builtin compilation failed: %d, try external compiler\n", err);
  85                         err = llvm__compile_bpf(filename, &obj_buf, &obj_buf_sz);
  86                         if (err)
  87                                 return ERR_PTR(-BPF_LOADER_ERRNO__COMPILE);
  88                 } else
  89                         pr_debug("bpf: successful builtin compilation\n");
  90                 obj = bpf_object__open_buffer(obj_buf, obj_buf_sz, filename);
  91
  92                 if (!IS_ERR_OR_NULL(obj) && llvm_param.dump_obj)
  93                         llvm__dump_obj(filename, obj_buf, obj_buf_sz);
  94
  95                 free(obj_buf);
  96         } else
  97                 obj = bpf_object__open(filename);
  98
  99         if (IS_ERR_OR_NULL(obj)) {
 100                 pr_debug("bpf: failed to load %s\n", filename);
 101                 return obj;
 102         }
 103
 104         return obj;
 105 }
 106
 107 void bpf__clear(void)
 108 {
 109         struct bpf_object *obj, *tmp;
 110
 111         bpf_object__for_each_safe(obj, tmp) {
 112                 bpf__unprobe(obj);
 113                 bpf_object__close(obj);
 114         }
 115 }
 116
 117 static void
 118 clear_prog_priv(struct bpf_program *prog __maybe_unused,
 119                 void *_priv)
 120 {
 121         struct bpf_prog_priv *priv = _priv;
 122
 123         cleanup_perf_probe_events(&priv->pev, 1);
 124         zfree(&priv->insns_buf);
 125         zfree(&priv->type_mapping);
 126         zfree(&priv->sys_name);
 127         zfree(&priv->evt_name);
 128         free(priv);
 129 }
 130
 131 static int
 132 prog_config__exec(const char *value, struct perf_probe_event *pev)
 133 {
 134         pev->uprobes = true;
 135         pev->target = strdup(value);
 136         if (!pev->target)
 137                 return -ENOMEM;
 138         return 0;
 139 }
 140
 141 static int
 142 prog_config__module(const char *value, struct perf_probe_event *pev)
 143 {
 144         pev->uprobes = false;
 145         pev->target = strdup(value);
 146         if (!pev->target)
 147                 return -ENOMEM;
 148         return 0;
 149 }
 150
 151 static int
 152 prog_config__bool(const char *value, bool *pbool, bool invert)
 153 {
 154         int err;
 155         bool bool_value;
 156
 157         if (!pbool)
 158                 return -EINVAL;
 159
 160         err = strtobool(value, &bool_value);
 161         if (err)
 162                 return err;
 163
 164         *pbool = invert ? !bool_value : bool_value;
 165         return 0;
 166 }
 167
 168 static int
 169 prog_config__inlines(const char *value,
 170                      struct perf_probe_event *pev __maybe_unused)
 171 {
 172         return prog_config__bool(value, &probe_conf.no_inlines, true);
 173 }
 174
 175 static int
 176 prog_config__force(const char *value,
 177                    struct perf_probe_event *pev __maybe_unused)
 178 {
 179         return prog_config__bool(value, &probe_conf.force_add, false);
 180 }
 181
 182 static struct {
 183         const char *key;
 184         const char *usage;
 185         const char *desc;
 186         int (*func)(const char *, struct perf_probe_event *);
 187 } bpf_prog_config_terms[] = {
 188         {
 189                 .key    = "exec",
 190                 .usage  = "exec=<full path of file>",
 191                 .desc   = "Set uprobe target",
 192                 .func   = prog_config__exec,
 193         },
 194         {
 195                 .key    = "module",
 196                 .usage  = "module=<module name>    ",
 197                 .desc   = "Set kprobe module",
 198                 .func   = prog_config__module,
 199         },
 200         {
 201                 .key    = "inlines",
 202                 .usage  = "inlines=[yes|no]        ",
 203                 .desc   = "Probe at inline symbol",
 204                 .func   = prog_config__inlines,
 205         },
 206         {
 207                 .key    = "force",
 208                 .usage  = "force=[yes|no]          ",
 209                 .desc   = "Forcibly add events with existing name",
 210                 .func   = prog_config__force,
 211         },
 212 };
 213
 214 static int
 215 do_prog_config(const char *key, const char *value,
 216                struct perf_probe_event *pev)
 217 {
 218         unsigned int i;
 219
 220         pr_debug("config bpf program: %s=%s\n", key, value);
 221         for (i = 0; i < ARRAY_SIZE(bpf_prog_config_terms); i++)
 222                 if (strcmp(key, bpf_prog_config_terms[i].key) == 0)
 223                         return bpf_prog_config_terms[i].func(value, pev);
 224
 225         pr_debug("BPF: ERROR: invalid program config option: %s=%s\n",
 226                  key, value);
 227
 228         pr_debug("\nHint: Valid options are:\n");
 229         for (i = 0; i < ARRAY_SIZE(bpf_prog_config_terms); i++)
 230                 pr_debug("\t%s:\t%s\n", bpf_prog_config_terms[i].usage,
 231                          bpf_prog_config_terms[i].desc);
 232         pr_debug("\n");
 233
 234         return -BPF_LOADER_ERRNO__PROGCONF_TERM;
 235 }
 236
 237 static const char *
 238 parse_prog_config_kvpair(const char *config_str, struct perf_probe_event *pev)
 239 {
 240         char *text = strdup(config_str);
 241         char *sep, *line;
 242         const char *main_str = NULL;
 243         int err = 0;
 244
 245         if (!text) {
 246                 pr_debug("Not enough memory: dup config_str failed\n");
 247                 return ERR_PTR(-ENOMEM);
 248         }
 249
 250         line = text;
 251         while ((sep = strchr(line, ';'))) {
 252                 char *equ;
 253
 254                 *sep = '\0';
 255                 equ = strchr(line, '=');
 256                 if (!equ) {
 257                         pr_warning("WARNING: invalid config in BPF object: %s\n",
 258                                    line);
 259                         pr_warning("\tShould be 'key=value'.\n");
 260                         goto nextline;
 261                 }
 262                 *equ = '\0';
 263
 264                 err = do_prog_config(line, equ + 1, pev);
 265                 if (err)
 266                         break;
 267 nextline:
 268                 line = sep + 1;
 269         }
 270
 271         if (!err)
 272                 main_str = config_str + (line - text);
 273         free(text);
 274
 275         return err ? ERR_PTR(err) : main_str;
 276 }
 277
 278 static int
 279 parse_prog_config(const char *config_str, const char **p_main_str,
 280                   bool *is_tp, struct perf_probe_event *pev)
 281 {
 282         int err;
 283         const char *main_str = parse_prog_config_kvpair(config_str, pev);
 284
 285         if (IS_ERR(main_str))
 286                 return PTR_ERR(main_str);
 287
 288         *p_main_str = main_str;
 289         if (!strchr(main_str, '=')) {
 290                 /* Is a tracepoint event? */
 291                 const char *s = strchr(main_str, ':');
 292
 293                 if (!s) {
 294                         pr_debug("bpf: '%s' is not a valid tracepoint\n",
 295                                  config_str);
 296                         return -BPF_LOADER_ERRNO__CONFIG;
 297                 }
 298
 299                 *is_tp = true;
 300                 return 0;
 301         }
 302
 303         *is_tp = false;
 304         err = parse_perf_probe_command(main_str, pev);
 305         if (err < 0) {
 306                 pr_debug("bpf: '%s' is not a valid config string\n",
 307                          config_str);
 308                 /* parse failed, don't need clear pev. */
 309                 return -BPF_LOADER_ERRNO__CONFIG;
 310         }
 311         return 0;
 312 }
 313
 314 static int
 315 config_bpf_program(struct bpf_program *prog)
 316 {
 317         struct perf_probe_event *pev = NULL;
 318         struct bpf_prog_priv *priv = NULL;
 319         const char *config_str, *main_str;
 320         bool is_tp = false;
 321         int err;
 322
 323         /* Initialize per-program probing setting */
 324         probe_conf.no_inlines = false;
 325         probe_conf.force_add = false;
 326
 327         config_str = bpf_program__title(prog, false);
 328         if (IS_ERR(config_str)) {
 329                 pr_debug("bpf: unable to get title for program\n");
 330                 return PTR_ERR(config_str);
 331         }
 332
 333         priv = calloc(sizeof(*priv), 1);
 334         if (!priv) {
 335                 pr_debug("bpf: failed to alloc priv\n");
 336                 return -ENOMEM;
 337         }
 338         pev = &priv->pev;
 339
 340         pr_debug("bpf: config program '%s'\n", config_str);
 341         err = parse_prog_config(config_str, &main_str, &is_tp, pev);
 342         if (err)
 343                 goto errout;
 344
 345         if (is_tp) {
 346                 char *s = strchr(main_str, ':');
 347
 348                 priv->is_tp = true;
 349                 priv->sys_name = strndup(main_str, s - main_str);
 350                 priv->evt_name = strdup(s + 1);
 351                 goto set_priv;
 352         }
 353
 354         if (pev->group && strcmp(pev->group, PERF_BPF_PROBE_GROUP)) {
 355                 pr_debug("bpf: '%s': group for event is set and not '%s'.\n",
 356                          config_str, PERF_BPF_PROBE_GROUP);
 357                 err = -BPF_LOADER_ERRNO__GROUP;
 358                 goto errout;
 359         } else if (!pev->group)
 360                 pev->group = strdup(PERF_BPF_PROBE_GROUP);
 361
 362         if (!pev->group) {
 363                 pr_debug("bpf: strdup failed\n");
 364                 err = -ENOMEM;
 365                 goto errout;
 366         }
 367
 368         if (!pev->event) {
 369                 pr_debug("bpf: '%s': event name is missing. Section name should be 'key=value'\n",
 370                          config_str);
 371                 err = -BPF_LOADER_ERRNO__EVENTNAME;
 372                 goto errout;
 373         }
 374         pr_debug("bpf: config '%s' is ok\n", config_str);
 375
 376 set_priv:
 377         err = bpf_program__set_priv(prog, priv, clear_prog_priv);
 378         if (err) {
 379                 pr_debug("Failed to set priv for program '%s'\n", config_str);
 380                 goto errout;
 381         }
 382
 383         return 0;
 384
 385 errout:
 386         if (pev)
 387                 clear_perf_probe_event(pev);
 388         free(priv);
 389         return err;
 390 }
 391
 392 static int bpf__prepare_probe(void)
 393 {
 394         static int err = 0;
 395         static bool initialized = false;
 396
 397         /*
 398          * Make err static, so if init failed the first, bpf__prepare_probe()
 399          * fails each time without calling init_probe_symbol_maps multiple
 400          * times.
 401          */
 402         if (initialized)
 403                 return err;
 404
 405         initialized = true;
 406         err = init_probe_symbol_maps(false);
 407         if (err < 0)
 408                 pr_debug("Failed to init_probe_symbol_maps\n");
 409         probe_conf.max_probes = MAX_PROBES;
 410         return err;
 411 }
 412
 413 static int
 414 preproc_gen_prologue(struct bpf_program *prog, int n,
 415                      struct bpf_insn *orig_insns, int orig_insns_cnt,
 416                      struct bpf_prog_prep_result *res)
 417 {
 418         struct bpf_prog_priv *priv = bpf_program__priv(prog);
 419         struct probe_trace_event *tev;
 420         struct perf_probe_event *pev;
 421         struct bpf_insn *buf;
 422         size_t prologue_cnt = 0;
 423         int i, err;
 424
 425         if (IS_ERR(priv) || !priv || priv->is_tp)
 426                 goto errout;
 427
 428         pev = &priv->pev;
 429
 430         if (n < 0 || n >= priv->nr_types)
 431                 goto errout;
 432
 433         /* Find a tev belongs to that type */
 434         for (i = 0; i < pev->ntevs; i++) {
 435                 if (priv->type_mapping[i] == n)
 436                         break;
 437         }
 438
 439         if (i >= pev->ntevs) {
 440                 pr_debug("Internal error: prologue type %d not found\n", n);
 441                 return -BPF_LOADER_ERRNO__PROLOGUE;
 442         }
 443
 444         tev = &pev->tevs[i];
 445
 446         buf = priv->insns_buf;
 447         err = bpf__gen_prologue(tev->args, tev->nargs,
 448                                 buf, &prologue_cnt,
 449                                 BPF_MAXINSNS - orig_insns_cnt);
 450         if (err) {
 451                 const char *title;
 452
 453                 title = bpf_program__title(prog, false);
 454                 if (!title)
 455                         title = "[unknown]";
 456
 457                 pr_debug("Failed to generate prologue for program %s\n",
 458                          title);
 459                 return err;
 460         }
 461
 462         memcpy(&buf[prologue_cnt], orig_insns,
 463                sizeof(struct bpf_insn) * orig_insns_cnt);
 464
 465         res->new_insn_ptr = buf;
 466         res->new_insn_cnt = prologue_cnt + orig_insns_cnt;
 467         res->pfd = NULL;
 468         return 0;
 469
 470 errout:
 471         pr_debug("Internal error in preproc_gen_prologue\n");
 472         return -BPF_LOADER_ERRNO__PROLOGUE;
 473 }
 474
 475 /*
 476  * compare_tev_args is reflexive, transitive and antisymmetric.
 477  * I can proof it but this margin is too narrow to contain.
 478  */
 479 static int compare_tev_args(const void *ptev1, const void *ptev2)
 480 {
 481         int i, ret;
 482         const struct probe_trace_event *tev1 =
 483                 *(const struct probe_trace_event **)ptev1;
 484         const struct probe_trace_event *tev2 =
 485                 *(const struct probe_trace_event **)ptev2;
 486
 487         ret = tev2->nargs - tev1->nargs;
 488         if (ret)
 489                 return ret;
 490
 491         for (i = 0; i < tev1->nargs; i++) {
 492                 struct probe_trace_arg *arg1, *arg2;
 493                 struct probe_trace_arg_ref *ref1, *ref2;
 494
 495                 arg1 = &tev1->args[i];
 496                 arg2 = &tev2->args[i];
 497
 498                 ret = strcmp(arg1->value, arg2->value);
 499                 if (ret)
 500                         return ret;
 501
 502                 ref1 = arg1->ref;
 503                 ref2 = arg2->ref;
 504
 505                 while (ref1 && ref2) {
 506                         ret = ref2->offset - ref1->offset;
 507                         if (ret)
 508                                 return ret;
 509
 510                         ref1 = ref1->next;
 511                         ref2 = ref2->next;
 512                 }
 513
 514                 if (ref1 || ref2)
 515                         return ref2 ? 1 : -1;
 516         }
 517
 518         return 0;
 519 }
 520
 521 /*
 522  * Assign a type number to each tevs in a pev.
 523  * mapping is an array with same slots as tevs in that pev.
 524  * nr_types will be set to number of types.
 525  */
 526 static int map_prologue(struct perf_probe_event *pev, int *mapping,
 527                         int *nr_types)
 528 {
 529         int i, type = 0;
 530         struct probe_trace_event **ptevs;
 531
 532         size_t array_sz = sizeof(*ptevs) * pev->ntevs;
 533
 534         ptevs = malloc(array_sz);
 535         if (!ptevs) {
 536                 pr_debug("Not enough memory: alloc ptevs failed\n");
 537                 return -ENOMEM;
 538         }
 539
 540         pr_debug("In map_prologue, ntevs=%d\n", pev->ntevs);
 541         for (i = 0; i < pev->ntevs; i++)
 542                 ptevs[i] = &pev->tevs[i];
 543
 544         qsort(ptevs, pev->ntevs, sizeof(*ptevs),
 545               compare_tev_args);
 546
 547         for (i = 0; i < pev->ntevs; i++) {
 548                 int n;
 549
 550                 n = ptevs[i] - pev->tevs;
 551                 if (i == 0) {
 552                         mapping[n] = type;
 553                         pr_debug("mapping[%d]=%d\n", n, type);
 554                         continue;
 555                 }
 556
 557                 if (compare_tev_args(ptevs + i, ptevs + i - 1) == 0)
 558                         mapping[n] = type;
 559                 else
 560                         mapping[n] = ++type;
 561
 562                 pr_debug("mapping[%d]=%d\n", n, mapping[n]);
 563         }
 564         free(ptevs);
 565         *nr_types = type + 1;
 566
 567         return 0;
 568 }
 569
 570 static int hook_load_preprocessor(struct bpf_program *prog)
 571 {
 572         struct bpf_prog_priv *priv = bpf_program__priv(prog);
 573         struct perf_probe_event *pev;
 574         bool need_prologue = false;
 575         int err, i;
 576
 577         if (IS_ERR(priv) || !priv) {
 578                 pr_debug("Internal error when hook preprocessor\n");
 579                 return -BPF_LOADER_ERRNO__INTERNAL;
 580         }
 581
 582         if (priv->is_tp) {
 583                 priv->need_prologue = false;
 584                 return 0;
 585         }
 586
 587         pev = &priv->pev;
 588         for (i = 0; i < pev->ntevs; i++) {
 589                 struct probe_trace_event *tev = &pev->tevs[i];
 590
 591                 if (tev->nargs > 0) {
 592                         need_prologue = true;
 593                         break;
 594                 }
 595         }
 596
 597         /*
 598          * Since all tevs don't have argument, we don't need generate
 599          * prologue.
 600          */
 601         if (!need_prologue) {
 602                 priv->need_prologue = false;
 603                 return 0;
 604         }
 605
 606         priv->need_prologue = true;
 607         priv->insns_buf = malloc(sizeof(struct bpf_insn) * BPF_MAXINSNS);
 608         if (!priv->insns_buf) {
 609                 pr_debug("Not enough memory: alloc insns_buf failed\n");
 610                 return -ENOMEM;
 611         }
 612
 613         priv->type_mapping = malloc(sizeof(int) * pev->ntevs);
 614         if (!priv->type_mapping) {
 615                 pr_debug("Not enough memory: alloc type_mapping failed\n");
 616                 return -ENOMEM;
 617         }
 618         memset(priv->type_mapping, -1,
 619                sizeof(int) * pev->ntevs);
 620
 621         err = map_prologue(pev, priv->type_mapping, &priv->nr_types);
 622         if (err)
 623                 return err;
 624
 625         err = bpf_program__set_prep(prog, priv->nr_types,
 626                                     preproc_gen_prologue);
 627         return err;
 628 }
 629
 630 int bpf__probe(struct bpf_object *obj)
 631 {
 632         int err = 0;
 633         struct bpf_program *prog;
 634         struct bpf_prog_priv *priv;
 635         struct perf_probe_event *pev;
 636
 637         err = bpf__prepare_probe();
 638         if (err) {
 639                 pr_debug("bpf__prepare_probe failed\n");
 640                 return err;
 641         }
 642
 643         bpf_object__for_each_program(prog, obj) {
 644                 err = config_bpf_program(prog);
 645                 if (err)
 646                         goto out;
 647
 648                 priv = bpf_program__priv(prog);
 649                 if (IS_ERR(priv) || !priv) {
 650                         err = PTR_ERR(priv);
 651                         goto out;
 652                 }
 653
 654                 if (priv->is_tp) {
 655                         bpf_program__set_tracepoint(prog);
 656                         continue;
 657                 }
 658
 659                 bpf_program__set_kprobe(prog);
 660                 pev = &priv->pev;
 661
 662                 err = convert_perf_probe_events(pev, 1);
 663                 if (err < 0) {
 664                         pr_debug("bpf_probe: failed to convert perf probe events\n");
 665                         goto out;
 666                 }
 667
 668                 err = apply_perf_probe_events(pev, 1);
 669                 if (err < 0) {
 670                         pr_debug("bpf_probe: failed to apply perf probe events\n");
 671                         goto out;
 672                 }
 673
 674                 /*
 675                  * After probing, let's consider prologue, which
 676                  * adds program fetcher to BPF programs.
 677                  *
 678                  * hook_load_preprocessorr() hooks pre-processor
 679                  * to bpf_program, let it generate prologue
 680                  * dynamically during loading.
 681                  */
 682                 err = hook_load_preprocessor(prog);
 683                 if (err)
 684                         goto out;
 685         }
 686 out:
 687         return err < 0 ? err : 0;
 688 }
 689
 690 #define EVENTS_WRITE_BUFSIZE  4096
 691 int bpf__unprobe(struct bpf_object *obj)
 692 {
 693         int err, ret = 0;
 694         struct bpf_program *prog;
 695
 696         bpf_object__for_each_program(prog, obj) {
 697                 struct bpf_prog_priv *priv = bpf_program__priv(prog);
 698                 int i;
 699
 700                 if (IS_ERR(priv) || !priv || priv->is_tp)
 701                         continue;
 702
 703                 for (i = 0; i < priv->pev.ntevs; i++) {
 704                         struct probe_trace_event *tev = &priv->pev.tevs[i];
 705                         char name_buf[EVENTS_WRITE_BUFSIZE];
 706                         struct strfilter *delfilter;
 707
 708                         snprintf(name_buf, EVENTS_WRITE_BUFSIZE,
 709                                  "%s:%s", tev->group, tev->event);
 710                         name_buf[EVENTS_WRITE_BUFSIZE - 1] = '\0';
 711
 712                         delfilter = strfilter__new(name_buf, NULL);
 713                         if (!delfilter) {
 714                                 pr_debug("Failed to create filter for unprobing\n");
 715                                 ret = -ENOMEM;
 716                                 continue;
 717                         }
 718
 719                         err = del_perf_probe_events(delfilter);
 720                         strfilter__delete(delfilter);
 721                         if (err) {
 722                                 pr_debug("Failed to delete %s\n", name_buf);
 723                                 ret = err;
 724                                 continue;
 725                         }
 726                 }
 727         }
 728         return ret;
 729 }
 730
 731 int bpf__load(struct bpf_object *obj)
 732 {
 733         int err;
 734
 735         err = bpf_object__load(obj);
 736         if (err) {
 737                 char bf[128];
 738                 libbpf_strerror(err, bf, sizeof(bf));
 739                 pr_debug("bpf: load objects failed: err=%d: (%s)\n", err, bf);
 740                 return err;
 741         }
 742         return 0;
 743 }
 744
 745 int bpf__foreach_event(struct bpf_object *obj,
 746                        bpf_prog_iter_callback_t func,
 747                        void *arg)
 748 {
 749         struct bpf_program *prog;
 750         int err;
 751
 752         bpf_object__for_each_program(prog, obj) {
 753                 struct bpf_prog_priv *priv = bpf_program__priv(prog);
 754                 struct probe_trace_event *tev;
 755                 struct perf_probe_event *pev;
 756                 int i, fd;
 757
 758                 if (IS_ERR(priv) || !priv) {
 759                         pr_debug("bpf: failed to get private field\n");
 760                         return -BPF_LOADER_ERRNO__INTERNAL;
 761                 }
 762
 763                 if (priv->is_tp) {
 764                         fd = bpf_program__fd(prog);
 765                         err = (*func)(priv->sys_name, priv->evt_name, fd, arg);
 766                         if (err) {
 767                                 pr_debug("bpf: tracepoint call back failed, stop iterate\n");
 768                                 return err;
 769                         }
 770                         continue;
 771                 }
 772
 773                 pev = &priv->pev;
 774                 for (i = 0; i < pev->ntevs; i++) {
 775                         tev = &pev->tevs[i];
 776
 777                         if (priv->need_prologue) {
 778                                 int type = priv->type_mapping[i];
 779
 780                                 fd = bpf_program__nth_fd(prog, type);
 781                         } else {
 782                                 fd = bpf_program__fd(prog);
 783                         }
 784
 785                         if (fd < 0) {
 786                                 pr_debug("bpf: failed to get file descriptor\n");
 787                                 return fd;
 788                         }
 789
 790                         err = (*func)(tev->group, tev->event, fd, arg);
 791                         if (err) {
 792                                 pr_debug("bpf: call back failed, stop iterate\n");
 793                                 return err;
 794                         }
 795                 }
 796         }
 797         return 0;
 798 }
 799
 800 enum bpf_map_op_type {
 801         BPF_MAP_OP_SET_VALUE,
 802         BPF_MAP_OP_SET_EVSEL,
 803 };
 804
 805 enum bpf_map_key_type {
 806         BPF_MAP_KEY_ALL,
 807         BPF_MAP_KEY_RANGES,
 808 };
 809
 810 struct bpf_map_op {
 811         struct list_head list;
 812         enum bpf_map_op_type op_type;
 813         enum bpf_map_key_type key_type;
 814         union {
 815                 struct parse_events_array array;
 816         } k;
 817         union {
 818                 u64 value;
 819                 struct perf_evsel *evsel;
 820         } v;
 821 };
 822
 823 struct bpf_map_priv {
 824         struct list_head ops_list;
 825 };
 826
 827 static void
 828 bpf_map_op__delete(struct bpf_map_op *op)
 829 {
 830         if (!list_empty(&op->list))
 831                 list_del(&op->list);
 832         if (op->key_type == BPF_MAP_KEY_RANGES)
 833                 parse_events__clear_array(&op->k.array);
 834         free(op);
 835 }
 836
 837 static void
 838 bpf_map_priv__purge(struct bpf_map_priv *priv)
 839 {
 840         struct bpf_map_op *pos, *n;
 841
 842         list_for_each_entry_safe(pos, n, &priv->ops_list, list) {
 843                 list_del_init(&pos->list);
 844                 bpf_map_op__delete(pos);
 845         }
 846 }
 847
 848 static void
 849 bpf_map_priv__clear(struct bpf_map *map __maybe_unused,
 850                     void *_priv)
 851 {
 852         struct bpf_map_priv *priv = _priv;
 853
 854         bpf_map_priv__purge(priv);
 855         free(priv);
 856 }
 857
 858 static int
 859 bpf_map_op_setkey(struct bpf_map_op *op, struct parse_events_term *term)
 860 {
 861         op->key_type = BPF_MAP_KEY_ALL;
 862         if (!term)
 863                 return 0;
 864
 865         if (term->array.nr_ranges) {
 866                 size_t memsz = term->array.nr_ranges *
 867                                 sizeof(op->k.array.ranges[0]);
 868
 869                 op->k.array.ranges = memdup(term->array.ranges, memsz);
 870                 if (!op->k.array.ranges) {
 871                         pr_debug("Not enough memory to alloc indices for map\n");
 872                         return -ENOMEM;
 873                 }
 874                 op->key_type = BPF_MAP_KEY_RANGES;
 875                 op->k.array.nr_ranges = term->array.nr_ranges;
 876         }
 877         return 0;
 878 }
 879
 880 static struct bpf_map_op *
 881 bpf_map_op__new(struct parse_events_term *term)
 882 {
 883         struct bpf_map_op *op;
 884         int err;
 885
 886         op = zalloc(sizeof(*op));
 887         if (!op) {
 888                 pr_debug("Failed to alloc bpf_map_op\n");
 889                 return ERR_PTR(-ENOMEM);
 890         }
 891         INIT_LIST_HEAD(&op->list);
 892
 893         err = bpf_map_op_setkey(op, term);
 894         if (err) {
 895                 free(op);
 896                 return ERR_PTR(err);
 897         }
 898         return op;
 899 }
 900
 901 static struct bpf_map_op *
 902 bpf_map_op__clone(struct bpf_map_op *op)
 903 {
 904         struct bpf_map_op *newop;
 905
 906         newop = memdup(op, sizeof(*op));
 907         if (!newop) {
 908                 pr_debug("Failed to alloc bpf_map_op\n");
 909                 return NULL;
 910         }
 911
 912         INIT_LIST_HEAD(&newop->list);
 913         if (op->key_type == BPF_MAP_KEY_RANGES) {
 914                 size_t memsz = op->k.array.nr_ranges *
 915                                sizeof(op->k.array.ranges[0]);
 916
 917                 newop->k.array.ranges = memdup(op->k.array.ranges, memsz);
 918                 if (!newop->k.array.ranges) {
 919                         pr_debug("Failed to alloc indices for map\n");
 920                         free(newop);
 921                         return NULL;
 922                 }
 923         }
 924
 925         return newop;
 926 }
 927
 928 static struct bpf_map_priv *
 929 bpf_map_priv__clone(struct bpf_map_priv *priv)
 930 {
 931         struct bpf_map_priv *newpriv;
 932         struct bpf_map_op *pos, *newop;
 933
 934         newpriv = zalloc(sizeof(*newpriv));
 935         if (!newpriv) {
 936                 pr_debug("Not enough memory to alloc map private\n");
 937                 return NULL;
 938         }
 939         INIT_LIST_HEAD(&newpriv->ops_list);
 940
 941         list_for_each_entry(pos, &priv->ops_list, list) {
 942                 newop = bpf_map_op__clone(pos);
 943                 if (!newop) {
 944                         bpf_map_priv__purge(newpriv);
 945                         return NULL;
 946                 }
 947                 list_add_tail(&newop->list, &newpriv->ops_list);
 948         }
 949
 950         return newpriv;
 951 }
 952
 953 static int
 954 bpf_map__add_op(struct bpf_map *map, struct bpf_map_op *op)
 955 {
 956         const char *map_name = bpf_map__name(map);
 957         struct bpf_map_priv *priv = bpf_map__priv(map);
 958
 959         if (IS_ERR(priv)) {
 960                 pr_debug("Failed to get private from map %s\n", map_name);
 961                 return PTR_ERR(priv);
 962         }
 963
 964         if (!priv) {
 965                 priv = zalloc(sizeof(*priv));
 966                 if (!priv) {
 967                         pr_debug("Not enough memory to alloc map private\n");
 968                         return -ENOMEM;
 969                 }
 970                 INIT_LIST_HEAD(&priv->ops_list);
 971
 972                 if (bpf_map__set_priv(map, priv, bpf_map_priv__clear)) {
 973                         free(priv);
 974                         return -BPF_LOADER_ERRNO__INTERNAL;
 975                 }
 976         }
 977
 978         list_add_tail(&op->list, &priv->ops_list);
 979         return 0;
 980 }
 981
 982 static struct bpf_map_op *
 983 bpf_map__add_newop(struct bpf_map *map, struct parse_events_term *term)
 984 {
 985         struct bpf_map_op *op;
 986         int err;
 987
 988         op = bpf_map_op__new(term);
 989         if (IS_ERR(op))
 990                 return op;
 991
 992         err = bpf_map__add_op(map, op);
 993         if (err) {
 994                 bpf_map_op__delete(op);
 995                 return ERR_PTR(err);
 996         }
 997         return op;
 998 }
 999
1000 static int
1001 __bpf_map__config_value(struct bpf_map *map,
1002                         struct parse_events_term *term)
1003 {
1004         struct bpf_map_op *op;
1005         const char *map_name = bpf_map__name(map);
1006         const struct bpf_map_def *def = bpf_map__def(map);
1007
1008         if (IS_ERR(def)) {
1009                 pr_debug("Unable to get map definition from '%s'\n",
1010                          map_name);
1011                 return -BPF_LOADER_ERRNO__INTERNAL;
1012         }
1013
1014         if (def->type != BPF_MAP_TYPE_ARRAY) {
1015                 pr_debug("Map %s type is not BPF_MAP_TYPE_ARRAY\n",
1016                          map_name);
1017                 return -BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE;
1018         }
1019         if (def->key_size < sizeof(unsigned int)) {
1020                 pr_debug("Map %s has incorrect key size\n", map_name);
1021                 return -BPF_LOADER_ERRNO__OBJCONF_MAP_KEYSIZE;
1022         }
1023         switch (def->value_size) {
1024         case 1:
1025         case 2:
1026         case 4:
1027         case 8:
1028                 break;
1029         default:
1030                 pr_debug("Map %s has incorrect value size\n", map_name);
1031                 return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUESIZE;
1032         }
1033
1034         op = bpf_map__add_newop(map, term);
1035         if (IS_ERR(op))
1036                 return PTR_ERR(op);
1037         op->op_type = BPF_MAP_OP_SET_VALUE;
1038         op->v.value = term->val.num;
1039         return 0;
1040 }
1041
1042 static int
1043 bpf_map__config_value(struct bpf_map *map,
1044                       struct parse_events_term *term,
1045                       struct perf_evlist *evlist __maybe_unused)
1046 {
1047         if (!term->err_val) {
1048                 pr_debug("Config value not set\n");
1049                 return -BPF_LOADER_ERRNO__OBJCONF_CONF;
1050         }
1051
1052         if (term->type_val != PARSE_EVENTS__TERM_TYPE_NUM) {
1053                 pr_debug("ERROR: wrong value type for 'value'\n");
1054                 return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUE;
1055         }
1056
1057         return __bpf_map__config_value(map, term);
1058 }
1059
1060 static int
1061 __bpf_map__config_event(struct bpf_map *map,
1062                         struct parse_events_term *term,
1063                         struct perf_evlist *evlist)
1064 {
1065         struct perf_evsel *evsel;
1066         const struct bpf_map_def *def;
1067         struct bpf_map_op *op;
1068         const char *map_name = bpf_map__name(map);
1069
1070         evsel = perf_evlist__find_evsel_by_str(evlist, term->val.str);
1071         if (!evsel) {
1072                 pr_debug("Event (for '%s') '%s' doesn't exist\n",
1073                          map_name, term->val.str);
1074                 return -BPF_LOADER_ERRNO__OBJCONF_MAP_NOEVT;
1075         }
1076
1077         def = bpf_map__def(map);
1078         if (IS_ERR(def)) {
1079                 pr_debug("Unable to get map definition from '%s'\n",
1080                          map_name);
1081                 return PTR_ERR(def);
1082         }
1083
1084         /*
1085          * No need to check key_size and value_size:
1086          * kernel has already checked them.
1087          */
1088         if (def->type != BPF_MAP_TYPE_PERF_EVENT_ARRAY) {
1089                 pr_debug("Map %s type is not BPF_MAP_TYPE_PERF_EVENT_ARRAY\n",
1090                          map_name);
1091                 return -BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE;
1092         }
1093
1094         op = bpf_map__add_newop(map, term);
1095         if (IS_ERR(op))
1096                 return PTR_ERR(op);
1097         op->op_type = BPF_MAP_OP_SET_EVSEL;
1098         op->v.evsel = evsel;
1099         return 0;
1100 }
1101
1102 static int
1103 bpf_map__config_event(struct bpf_map *map,
1104                       struct parse_events_term *term,
1105                       struct perf_evlist *evlist)
1106 {
1107         if (!term->err_val) {
1108                 pr_debug("Config value not set\n");
1109                 return -BPF_LOADER_ERRNO__OBJCONF_CONF;
1110         }
1111
1112         if (term->type_val != PARSE_EVENTS__TERM_TYPE_STR) {
1113                 pr_debug("ERROR: wrong value type for 'event'\n");
1114                 return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUE;
1115         }
1116
1117         return __bpf_map__config_event(map, term, evlist);
1118 }
1119
1120 struct bpf_obj_config__map_func {
1121         const char *config_opt;
1122         int (*config_func)(struct bpf_map *, struct parse_events_term *,
1123                            struct perf_evlist *);
1124 };
1125
1126 struct bpf_obj_config__map_func bpf_obj_config__map_funcs[] = {
1127         {"value", bpf_map__config_value},
1128         {"event", bpf_map__config_event},
1129 };
1130
1131 static int
1132 config_map_indices_range_check(struct parse_events_term *term,
1133                                struct bpf_map *map,
1134                                const char *map_name)
1135 {
1136         struct parse_events_array *array = &term->array;
1137         const struct bpf_map_def *def;
1138         unsigned int i;
1139
1140         if (!array->nr_ranges)
1141                 return 0;
1142         if (!array->ranges) {
1143                 pr_debug("ERROR: map %s: array->nr_ranges is %d but range array is NULL\n",
1144                          map_name, (int)array->nr_ranges);
1145                 return -BPF_LOADER_ERRNO__INTERNAL;
1146         }
1147
1148         def = bpf_map__def(map);
1149         if (IS_ERR(def)) {
1150                 pr_debug("ERROR: Unable to get map definition from '%s'\n",
1151                          map_name);
1152                 return -BPF_LOADER_ERRNO__INTERNAL;
1153         }
1154
1155         for (i = 0; i < array->nr_ranges; i++) {
1156                 unsigned int start = array->ranges[i].start;
1157                 size_t length = array->ranges[i].length;
1158                 unsigned int idx = start + length - 1;
1159
1160                 if (idx >= def->max_entries) {
1161                         pr_debug("ERROR: index %d too large\n", idx);
1162                         return -BPF_LOADER_ERRNO__OBJCONF_MAP_IDX2BIG;
1163                 }
1164         }
1165         return 0;
1166 }
1167
1168 static int
1169 bpf__obj_config_map(struct bpf_object *obj,
1170                     struct parse_events_term *term,
1171                     struct perf_evlist *evlist,
1172                     int *key_scan_pos)
1173 {
1174         /* key is "map:<mapname>.<config opt>" */
1175         char *map_name = strdup(term->config + sizeof("map:") - 1);
1176         struct bpf_map *map;
1177         int err = -BPF_LOADER_ERRNO__OBJCONF_OPT;
1178         char *map_opt;
1179         size_t i;
1180
1181         if (!map_name)
1182                 return -ENOMEM;
1183
1184         map_opt = strchr(map_name, '.');
1185         if (!map_opt) {
1186                 pr_debug("ERROR: Invalid map config: %s\n", map_name);
1187                 goto out;
1188         }
1189
1190         *map_opt++ = '\0';
1191         if (*map_opt == '\0') {
1192                 pr_debug("ERROR: Invalid map option: %s\n", term->config);
1193                 goto out;
1194         }
1195
1196         map = bpf_object__find_map_by_name(obj, map_name);
1197         if (!map) {
1198                 pr_debug("ERROR: Map %s doesn't exist\n", map_name);
1199                 err = -BPF_LOADER_ERRNO__OBJCONF_MAP_NOTEXIST;
1200                 goto out;
1201         }
1202
1203         *key_scan_pos += strlen(map_opt);
1204         err = config_map_indices_range_check(term, map, map_name);
1205         if (err)
1206                 goto out;
1207         *key_scan_pos -= strlen(map_opt);
1208
1209         for (i = 0; i < ARRAY_SIZE(bpf_obj_config__map_funcs); i++) {
1210                 struct bpf_obj_config__map_func *func =
1211                                 &bpf_obj_config__map_funcs[i];
1212
1213                 if (strcmp(map_opt, func->config_opt) == 0) {
1214                         err = func->config_func(map, term, evlist);
1215                         goto out;
1216                 }
1217         }
1218
1219         pr_debug("ERROR: Invalid map config option '%s'\n", map_opt);
1220         err = -BPF_LOADER_ERRNO__OBJCONF_MAP_OPT;
1221 out:
1222         free(map_name);
1223         if (!err)
1224                 key_scan_pos += strlen(map_opt);
1225         return err;
1226 }
1227
1228 int bpf__config_obj(struct bpf_object *obj,
1229                     struct parse_events_term *term,
1230                     struct perf_evlist *evlist,
1231                     int *error_pos)
1232 {
1233         int key_scan_pos = 0;
1234         int err;
1235
1236         if (!obj || !term || !term->config)
1237                 return -EINVAL;
1238
1239         if (strstarts(term->config, "map:")) {
1240                 key_scan_pos = sizeof("map:") - 1;
1241                 err = bpf__obj_config_map(obj, term, evlist, &key_scan_pos);
1242                 goto out;
1243         }
1244         err = -BPF_LOADER_ERRNO__OBJCONF_OPT;
1245 out:
1246         if (error_pos)
1247                 *error_pos = key_scan_pos;
1248         return err;
1249
1250 }
1251
1252 typedef int (*map_config_func_t)(const char *name, int map_fd,
1253                                  const struct bpf_map_def *pdef,
1254                                  struct bpf_map_op *op,
1255                                  void *pkey, void *arg);
1256
1257 static int
1258 foreach_key_array_all(map_config_func_t func,
1259                       void *arg, const char *name,
1260                       int map_fd, const struct bpf_map_def *pdef,
1261                       struct bpf_map_op *op)
1262 {
1263         unsigned int i;
1264         int err;
1265
1266         for (i = 0; i < pdef->max_entries; i++) {
1267                 err = func(name, map_fd, pdef, op, &i, arg);
1268                 if (err) {
1269                         pr_debug("ERROR: failed to insert value to %s[%u]\n",
1270                                  name, i);
1271                         return err;
1272                 }
1273         }
1274         return 0;
1275 }
1276
1277 static int
1278 foreach_key_array_ranges(map_config_func_t func, void *arg,
1279                          const char *name, int map_fd,
1280                          const struct bpf_map_def *pdef,
1281                          struct bpf_map_op *op)
1282 {
1283         unsigned int i, j;
1284         int err;
1285
1286         for (i = 0; i < op->k.array.nr_ranges; i++) {
1287                 unsigned int start = op->k.array.ranges[i].start;
1288                 size_t length = op->k.array.ranges[i].length;
1289
1290                 for (j = 0; j < length; j++) {
1291                         unsigned int idx = start + j;
1292
1293                         err = func(name, map_fd, pdef, op, &idx, arg);
1294                         if (err) {
1295                                 pr_debug("ERROR: failed to insert value to %s[%u]\n",
1296                                          name, idx);
1297                                 return err;
1298                         }
1299                 }
1300         }
1301         return 0;
1302 }
1303
1304 static int
1305 bpf_map_config_foreach_key(struct bpf_map *map,
1306                            map_config_func_t func,
1307                            void *arg)
1308 {
1309         int err, map_fd;
1310         struct bpf_map_op *op;
1311         const struct bpf_map_def *def;
1312         const char *name = bpf_map__name(map);
1313         struct bpf_map_priv *priv = bpf_map__priv(map);
1314
1315         if (IS_ERR(priv)) {
1316                 pr_debug("ERROR: failed to get private from map %s\n", name);
1317                 return -BPF_LOADER_ERRNO__INTERNAL;
1318         }
1319         if (!priv || list_empty(&priv->ops_list)) {
1320                 pr_debug("INFO: nothing to config for map %s\n", name);
1321                 return 0;
1322         }
1323
1324         def = bpf_map__def(map);
1325         if (IS_ERR(def)) {
1326                 pr_debug("ERROR: failed to get definition from map %s\n", name);
1327                 return -BPF_LOADER_ERRNO__INTERNAL;
1328         }
1329         map_fd = bpf_map__fd(map);
1330         if (map_fd < 0) {
1331                 pr_debug("ERROR: failed to get fd from map %s\n", name);
1332                 return map_fd;
1333         }
1334
1335         list_for_each_entry(op, &priv->ops_list, list) {
1336                 switch (def->type) {
1337                 case BPF_MAP_TYPE_ARRAY:
1338                 case BPF_MAP_TYPE_PERF_EVENT_ARRAY:
1339                         switch (op->key_type) {
1340                         case BPF_MAP_KEY_ALL:
1341                                 err = foreach_key_array_all(func, arg, name,
1342                                                             map_fd, def, op);
1343                                 break;
1344                         case BPF_MAP_KEY_RANGES:
1345                                 err = foreach_key_array_ranges(func, arg, name,
1346                                                                map_fd, def,
1347                                                                op);
1348                                 break;
1349                         default:
1350                                 pr_debug("ERROR: keytype for map '%s' invalid\n",
1351                                          name);
1352                                 return -BPF_LOADER_ERRNO__INTERNAL;
1353                         }
1354                         if (err)
1355                                 return err;
1356                         break;
1357                 default:
1358                         pr_debug("ERROR: type of '%s' incorrect\n", name);
1359                         return -BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE;
1360                 }
1361         }
1362
1363         return 0;
1364 }
1365
1366 static int
1367 apply_config_value_for_key(int map_fd, void *pkey,
1368                            size_t val_size, u64 val)
1369 {
1370         int err = 0;
1371
1372         switch (val_size) {
1373         case 1: {
1374                 u8 _val = (u8)(val);
1375                 err = bpf_map_update_elem(map_fd, pkey, &_val, BPF_ANY);
1376                 break;
1377         }
1378         case 2: {
1379                 u16 _val = (u16)(val);
1380                 err = bpf_map_update_elem(map_fd, pkey, &_val, BPF_ANY);
1381                 break;
1382         }
1383         case 4: {
1384                 u32 _val = (u32)(val);
1385                 err = bpf_map_update_elem(map_fd, pkey, &_val, BPF_ANY);
1386                 break;
1387         }
1388         case 8: {
1389                 err = bpf_map_update_elem(map_fd, pkey, &val, BPF_ANY);
1390                 break;
1391         }
1392         default:
1393                 pr_debug("ERROR: invalid value size\n");
1394                 return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUESIZE;
1395         }
1396         if (err && errno)
1397                 err = -errno;
1398         return err;
1399 }
1400
1401 static int
1402 apply_config_evsel_for_key(const char *name, int map_fd, void *pkey,
1403                            struct perf_evsel *evsel)
1404 {
1405         struct xyarray *xy = evsel->fd;
1406         struct perf_event_attr *attr;
1407         unsigned int key, events;
1408         bool check_pass = false;
1409         int *evt_fd;
1410         int err;
1411
1412         if (!xy) {
1413                 pr_debug("ERROR: evsel not ready for map %s\n", name);
1414                 return -BPF_LOADER_ERRNO__INTERNAL;
1415         }
1416
1417         if (xy->row_size / xy->entry_size != 1) {
1418                 pr_debug("ERROR: Dimension of target event is incorrect for map %s\n",
1419                          name);
1420                 return -BPF_LOADER_ERRNO__OBJCONF_MAP_EVTDIM;
1421         }
1422
1423         attr = &evsel->attr;
1424         if (attr->inherit) {
1425                 pr_debug("ERROR: Can't put inherit event into map %s\n", name);
1426                 return -BPF_LOADER_ERRNO__OBJCONF_MAP_EVTINH;
1427         }
1428
1429         if (perf_evsel__is_bpf_output(evsel))
1430                 check_pass = true;
1431         if (attr->type == PERF_TYPE_RAW)
1432                 check_pass = true;
1433         if (attr->type == PERF_TYPE_HARDWARE)
1434                 check_pass = true;
1435         if (!check_pass) {
1436                 pr_debug("ERROR: Event type is wrong for map %s\n", name);
1437                 return -BPF_LOADER_ERRNO__OBJCONF_MAP_EVTTYPE;
1438         }
1439
1440         events = xy->entries / (xy->row_size / xy->entry_size);
1441         key = *((unsigned int *)pkey);
1442         if (key >= events) {
1443                 pr_debug("ERROR: there is no event %d for map %s\n",
1444                          key, name);
1445                 return -BPF_LOADER_ERRNO__OBJCONF_MAP_MAPSIZE;
1446         }
1447         evt_fd = xyarray__entry(xy, key, 0);
1448         err = bpf_map_update_elem(map_fd, pkey, evt_fd, BPF_ANY);
1449         if (err && errno)
1450                 err = -errno;
1451         return err;
1452 }
1453
1454 static int
1455 apply_obj_config_map_for_key(const char *name, int map_fd,
1456                              const struct bpf_map_def *pdef,
1457                              struct bpf_map_op *op,
1458                              void *pkey, void *arg __maybe_unused)
1459 {
1460         int err;
1461
1462         switch (op->op_type) {
1463         case BPF_MAP_OP_SET_VALUE:
1464                 err = apply_config_value_for_key(map_fd, pkey,
1465                                                  pdef->value_size,
1466                                                  op->v.value);
1467                 break;
1468         case BPF_MAP_OP_SET_EVSEL:
1469                 err = apply_config_evsel_for_key(name, map_fd, pkey,
1470                                                  op->v.evsel);
1471                 break;
1472         default:
1473                 pr_debug("ERROR: unknown value type for '%s'\n", name);
1474                 err = -BPF_LOADER_ERRNO__INTERNAL;
1475         }
1476         return err;
1477 }
1478
1479 static int
1480 apply_obj_config_map(struct bpf_map *map)
1481 {
1482         return bpf_map_config_foreach_key(map,
1483                                           apply_obj_config_map_for_key,
1484                                           NULL);
1485 }
1486
1487 static int
1488 apply_obj_config_object(struct bpf_object *obj)
1489 {
1490         struct bpf_map *map;
1491         int err;
1492
1493         bpf_object__for_each_map(map, obj) {
1494                 err = apply_obj_config_map(map);
1495                 if (err)
1496                         return err;
1497         }
1498         return 0;
1499 }
1500
1501 int bpf__apply_obj_config(void)
1502 {
1503         struct bpf_object *obj, *tmp;
1504         int err;
1505
1506         bpf_object__for_each_safe(obj, tmp) {
1507                 err = apply_obj_config_object(obj);
1508                 if (err)
1509                         return err;
1510         }
1511
1512         return 0;
1513 }
1514
1515 #define bpf__for_each_map(pos, obj, objtmp)     \
1516         bpf_object__for_each_safe(obj, objtmp)  \
1517                 bpf_object__for_each_map(pos, obj)
1518
1519 #define bpf__for_each_map_named(pos, obj, objtmp, name) \
1520         bpf__for_each_map(pos, obj, objtmp)             \
1521                 if (bpf_map__name(pos) &&               \
1522                         (strcmp(name,                   \
1523                                 bpf_map__name(pos)) == 0))
1524
1525 struct perf_evsel *bpf__setup_output_event(struct perf_evlist *evlist, const char *name)
1526 {
1527         struct bpf_map_priv *tmpl_priv = NULL;
1528         struct bpf_object *obj, *tmp;
1529         struct perf_evsel *evsel = NULL;
1530         struct bpf_map *map;
1531         int err;
1532         bool need_init = false;
1533
1534         bpf__for_each_map_named(map, obj, tmp, name) {
1535                 struct bpf_map_priv *priv = bpf_map__priv(map);
1536
1537                 if (IS_ERR(priv))
1538                         return ERR_PTR(-BPF_LOADER_ERRNO__INTERNAL);
1539
1540                 /*
1541                  * No need to check map type: type should have been
1542                  * verified by kernel.
1543                  */
1544                 if (!need_init && !priv)
1545                         need_init = !priv;
1546                 if (!tmpl_priv && priv)
1547                         tmpl_priv = priv;
1548         }
1549
1550         if (!need_init)
1551                 return NULL;
1552
1553         if (!tmpl_priv) {
1554                 char *event_definition = NULL;
1555
1556                 if (asprintf(&event_definition, "bpf-output/no-inherit=1,name=%s/", name) < 0)
1557                         return ERR_PTR(-ENOMEM);
1558
1559                 err = parse_events(evlist, event_definition, NULL);
1560                 free(event_definition);
1561
1562                 if (err) {
1563                         pr_debug("ERROR: failed to create the \"%s\" bpf-output event\n", name);
1564                         return ERR_PTR(-err);
1565                 }
1566
1567                 evsel = perf_evlist__last(evlist);
1568         }
1569
1570         bpf__for_each_map_named(map, obj, tmp, name) {
1571                 struct bpf_map_priv *priv = bpf_map__priv(map);
1572
1573                 if (IS_ERR(priv))
1574                         return ERR_PTR(-BPF_LOADER_ERRNO__INTERNAL);
1575                 if (priv)
1576                         continue;
1577
1578                 if (tmpl_priv) {
1579                         priv = bpf_map_priv__clone(tmpl_priv);
1580                         if (!priv)
1581                                 return ERR_PTR(-ENOMEM);
1582
1583                         err = bpf_map__set_priv(map, priv, bpf_map_priv__clear);
1584                         if (err) {
1585                                 bpf_map_priv__clear(map, priv);
1586                                 return ERR_PTR(err);
1587                         }
1588                 } else if (evsel) {
1589                         struct bpf_map_op *op;
1590
1591                         op = bpf_map__add_newop(map, NULL);
1592                         if (IS_ERR(op))
1593                                 return ERR_CAST(op);
1594                         op->op_type = BPF_MAP_OP_SET_EVSEL;
1595                         op->v.evsel = evsel;
1596                 }
1597         }
1598
1599         return evsel;
1600 }
1601
1602 int bpf__setup_stdout(struct perf_evlist *evlist)
1603 {
1604         struct perf_evsel *evsel = bpf__setup_output_event(evlist, "__bpf_stdout__");
1605         return PTR_ERR_OR_ZERO(evsel);
1606 }
1607
1608 #define ERRNO_OFFSET(e)         ((e) - __BPF_LOADER_ERRNO__START)
1609 #define ERRCODE_OFFSET(c)       ERRNO_OFFSET(BPF_LOADER_ERRNO__##c)
1610 #define NR_ERRNO        (__BPF_LOADER_ERRNO__END - __BPF_LOADER_ERRNO__START)
1611
1612 static const char *bpf_loader_strerror_table[NR_ERRNO] = {
1613         [ERRCODE_OFFSET(CONFIG)]        = "Invalid config string",
1614         [ERRCODE_OFFSET(GROUP)]         = "Invalid group name",
1615         [ERRCODE_OFFSET(EVENTNAME)]     = "No event name found in config string",
1616         [ERRCODE_OFFSET(INTERNAL)]      = "BPF loader internal error",
1617         [ERRCODE_OFFSET(COMPILE)]       = "Error when compiling BPF scriptlet",
1618         [ERRCODE_OFFSET(PROGCONF_TERM)] = "Invalid program config term in config string",
1619         [ERRCODE_OFFSET(PROLOGUE)]      = "Failed to generate prologue",
1620         [ERRCODE_OFFSET(PROLOGUE2BIG)]  = "Prologue too big for program",
1621         [ERRCODE_OFFSET(PROLOGUEOOB)]   = "Offset out of bound for prologue",
1622         [ERRCODE_OFFSET(OBJCONF_OPT)]   = "Invalid object config option",
1623         [ERRCODE_OFFSET(OBJCONF_CONF)]  = "Config value not set (missing '=')",
1624         [ERRCODE_OFFSET(OBJCONF_MAP_OPT)]       = "Invalid object map config option",
1625         [ERRCODE_OFFSET(OBJCONF_MAP_NOTEXIST)]  = "Target map doesn't exist",
1626         [ERRCODE_OFFSET(OBJCONF_MAP_VALUE)]     = "Incorrect value type for map",
1627         [ERRCODE_OFFSET(OBJCONF_MAP_TYPE)]      = "Incorrect map type",
1628         [ERRCODE_OFFSET(OBJCONF_MAP_KEYSIZE)]   = "Incorrect map key size",
1629         [ERRCODE_OFFSET(OBJCONF_MAP_VALUESIZE)] = "Incorrect map value size",
1630         [ERRCODE_OFFSET(OBJCONF_MAP_NOEVT)]     = "Event not found for map setting",
1631         [ERRCODE_OFFSET(OBJCONF_MAP_MAPSIZE)]   = "Invalid map size for event setting",
1632         [ERRCODE_OFFSET(OBJCONF_MAP_EVTDIM)]    = "Event dimension too large",
1633         [ERRCODE_OFFSET(OBJCONF_MAP_EVTINH)]    = "Doesn't support inherit event",
1634         [ERRCODE_OFFSET(OBJCONF_MAP_EVTTYPE)]   = "Wrong event type for map",
1635         [ERRCODE_OFFSET(OBJCONF_MAP_IDX2BIG)]   = "Index too large",
1636 };
1637
1638 static int
1639 bpf_loader_strerror(int err, char *buf, size_t size)
1640 {
1641         char sbuf[STRERR_BUFSIZE];
1642         const char *msg;
1643
1644         if (!buf || !size)
1645                 return -1;
1646
1647         err = err > 0 ? err : -err;
1648
1649         if (err >= __LIBBPF_ERRNO__START)
1650                 return libbpf_strerror(err, buf, size);
1651
1652         if (err >= __BPF_LOADER_ERRNO__START && err < __BPF_LOADER_ERRNO__END) {
1653                 msg = bpf_loader_strerror_table[ERRNO_OFFSET(err)];
1654                 snprintf(buf, size, "%s", msg);
1655                 buf[size - 1] = '\0';
1656                 return 0;
1657         }
1658
1659         if (err >= __BPF_LOADER_ERRNO__END)
1660                 snprintf(buf, size, "Unknown bpf loader error %d", err);
1661         else
1662                 snprintf(buf, size, "%s",
1663                          str_error_r(err, sbuf, sizeof(sbuf)));
1664
1665         buf[size - 1] = '\0';
1666         return -1;
1667 }
1668
1669 #define bpf__strerror_head(err, buf, size) \
1670         char sbuf[STRERR_BUFSIZE], *emsg;\
1671         if (!size)\
1672                 return 0;\
1673         if (err < 0)\
1674                 err = -err;\
1675         bpf_loader_strerror(err, sbuf, sizeof(sbuf));\
1676         emsg = sbuf;\
1677         switch (err) {\
1678         default:\
1679                 scnprintf(buf, size, "%s", emsg);\
1680                 break;
1681
1682 #define bpf__strerror_entry(val, fmt...)\
1683         case val: {\
1684                 scnprintf(buf, size, fmt);\
1685                 break;\
1686         }
1687
1688 #define bpf__strerror_end(buf, size)\
1689         }\
1690         buf[size - 1] = '\0';
1691
1692 int bpf__strerror_prepare_load(const char *filename, bool source,
1693                                int err, char *buf, size_t size)
1694 {
1695         size_t n;
1696         int ret;
1697
1698         n = snprintf(buf, size, "Failed to load %s%s: ",
1699                          filename, source ? " from source" : "");
1700         if (n >= size) {
1701                 buf[size - 1] = '\0';
1702                 return 0;
1703         }
1704         buf += n;
1705         size -= n;
1706
1707         ret = bpf_loader_strerror(err, buf, size);
1708         buf[size - 1] = '\0';
1709         return ret;
1710 }
1711
1712 int bpf__strerror_probe(struct bpf_object *obj __maybe_unused,
1713                         int err, char *buf, size_t size)
1714 {
1715         bpf__strerror_head(err, buf, size);
1716         case BPF_LOADER_ERRNO__PROGCONF_TERM: {
1717                 scnprintf(buf, size, "%s (add -v to see detail)", emsg);
1718                 break;
1719         }
1720         bpf__strerror_entry(EEXIST, "Probe point exist. Try 'perf probe -d \"*\"' and set 'force=yes'");
1721         bpf__strerror_entry(EACCES, "You need to be root");
1722         bpf__strerror_entry(EPERM, "You need to be root, and /proc/sys/kernel/kptr_restrict should be 0");
1723         bpf__strerror_entry(ENOENT, "You need to check probing points in BPF file");
1724         bpf__strerror_end(buf, size);
1725         return 0;
1726 }
1727
1728 int bpf__strerror_load(struct bpf_object *obj,
1729                        int err, char *buf, size_t size)
1730 {
1731         bpf__strerror_head(err, buf, size);
1732         case LIBBPF_ERRNO__KVER: {
1733                 unsigned int obj_kver = bpf_object__kversion(obj);
1734                 unsigned int real_kver;
1735
1736                 if (fetch_kernel_version(&real_kver, NULL, 0)) {
1737                         scnprintf(buf, size, "Unable to fetch kernel version");
1738                         break;
1739                 }
1740
1741                 if (obj_kver != real_kver) {
1742                         scnprintf(buf, size,
1743                                   "'version' ("KVER_FMT") doesn't match running kernel ("KVER_FMT")",
1744                                   KVER_PARAM(obj_kver),
1745                                   KVER_PARAM(real_kver));
1746                         break;
1747                 }
1748
1749                 scnprintf(buf, size, "Failed to load program for unknown reason");
1750                 break;
1751         }
1752         bpf__strerror_end(buf, size);
1753         return 0;
1754 }
1755
1756 int bpf__strerror_config_obj(struct bpf_object *obj __maybe_unused,
1757                              struct parse_events_term *term __maybe_unused,
1758                              struct perf_evlist *evlist __maybe_unused,
1759                              int *error_pos __maybe_unused, int err,
1760                              char *buf, size_t size)
1761 {
1762         bpf__strerror_head(err, buf, size);
1763         bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE,
1764                             "Can't use this config term with this map type");
1765         bpf__strerror_end(buf, size);
1766         return 0;
1767 }
1768
1769 int bpf__strerror_apply_obj_config(int err, char *buf, size_t size)
1770 {
1771         bpf__strerror_head(err, buf, size);
1772         bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_EVTDIM,
1773                             "Cannot set event to BPF map in multi-thread tracing");
1774         bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_EVTINH,
1775                             "%s (Hint: use -i to turn off inherit)", emsg);
1776         bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_EVTTYPE,
1777                             "Can only put raw, hardware and BPF output event into a BPF map");
1778         bpf__strerror_end(buf, size);
1779         return 0;
1780 }
1781
1782 int bpf__strerror_setup_output_event(struct perf_evlist *evlist __maybe_unused,
1783                                      int err, char *buf, size_t size)
1784 {
1785         bpf__strerror_head(err, buf, size);
1786         bpf__strerror_end(buf, size);
1787         return 0;
1788 }