tools/perf/util/bpf-loader.c

   1 /*
   2  * bpf-loader.c
   3  *
   4  * Copyright (C) 2015 Wang Nan <wangnan0@huawei.com>
   5  * Copyright (C) 2015 Huawei Inc.
   6  */
   7
   8 #include <linux/bpf.h>
   9 #include <bpf/libbpf.h>
  10 #include <bpf/bpf.h>
  11 #include <linux/err.h>
  12 #include <linux/string.h>
  13 #include "perf.h"
  14 #include "debug.h"
  15 #include "bpf-loader.h"
  16 #include "bpf-prologue.h"
  17 #include "llvm-utils.h"
  18 #include "probe-event.h"
  19 #include "probe-finder.h" // for MAX_PROBES
  20 #include "parse-events.h"
  21 #include "llvm-utils.h"
  22
  23 #define DEFINE_PRINT_FN(name, level) \
  24 static int libbpf_##name(const char *fmt, ...)  \
  25 {                                               \
  26         va_list args;                           \
  27         int ret;                                \
  28                                                 \
  29         va_start(args, fmt);                    \
  30         ret = veprintf(level, verbose, pr_fmt(fmt), args);\
  31         va_end(args);                           \
  32         return ret;                             \
  33 }
  34
  35 DEFINE_PRINT_FN(warning, 1)
  36 DEFINE_PRINT_FN(info, 1)
  37 DEFINE_PRINT_FN(debug, 1)
  38
  39 struct bpf_prog_priv {
  40         bool is_tp;
  41         char *sys_name;
  42         char *evt_name;
  43         struct perf_probe_event pev;
  44         bool need_prologue;
  45         struct bpf_insn *insns_buf;
  46         int nr_types;
  47         int *type_mapping;
  48 };
  49
  50 static bool libbpf_initialized;
  51
  52 struct bpf_object *
  53 bpf__prepare_load_buffer(void *obj_buf, size_t obj_buf_sz, const char *name)
  54 {
  55         struct bpf_object *obj;
  56
  57         if (!libbpf_initialized) {
  58                 libbpf_set_print(libbpf_warning,
  59                                  libbpf_info,
  60                                  libbpf_debug);
  61                 libbpf_initialized = true;
  62         }
  63
  64         obj = bpf_object__open_buffer(obj_buf, obj_buf_sz, name);
  65         if (IS_ERR(obj)) {
  66                 pr_debug("bpf: failed to load buffer\n");
  67                 return ERR_PTR(-EINVAL);
  68         }
  69
  70         return obj;
  71 }
  72
  73 struct bpf_object *bpf__prepare_load(const char *filename, bool source)
  74 {
  75         struct bpf_object *obj;
  76
  77         if (!libbpf_initialized) {
  78                 libbpf_set_print(libbpf_warning,
  79                                  libbpf_info,
  80                                  libbpf_debug);
  81                 libbpf_initialized = true;
  82         }
  83
  84         if (source) {
  85                 int err;
  86                 void *obj_buf;
  87                 size_t obj_buf_sz;
  88
  89                 err = llvm__compile_bpf(filename, &obj_buf, &obj_buf_sz);
  90                 if (err)
  91                         return ERR_PTR(-BPF_LOADER_ERRNO__COMPILE);
  92                 obj = bpf_object__open_buffer(obj_buf, obj_buf_sz, filename);
  93
  94                 if (!IS_ERR(obj) && llvm_param.dump_obj)
  95                         llvm__dump_obj(filename, obj_buf, obj_buf_sz);
  96
  97                 free(obj_buf);
  98         } else
  99                 obj = bpf_object__open(filename);
 100
 101         if (IS_ERR(obj)) {
 102                 pr_debug("bpf: failed to load %s\n", filename);
 103                 return obj;
 104         }
 105
 106         return obj;
 107 }
 108
 109 void bpf__clear(void)
 110 {
 111         struct bpf_object *obj, *tmp;
 112
 113         bpf_object__for_each_safe(obj, tmp) {
 114                 bpf__unprobe(obj);
 115                 bpf_object__close(obj);
 116         }
 117 }
 118
 119 static void
 120 clear_prog_priv(struct bpf_program *prog __maybe_unused,
 121                 void *_priv)
 122 {
 123         struct bpf_prog_priv *priv = _priv;
 124
 125         cleanup_perf_probe_events(&priv->pev, 1);
 126         zfree(&priv->insns_buf);
 127         zfree(&priv->type_mapping);
 128         zfree(&priv->sys_name);
 129         zfree(&priv->evt_name);
 130         free(priv);
 131 }
 132
 133 static int
 134 prog_config__exec(const char *value, struct perf_probe_event *pev)
 135 {
 136         pev->uprobes = true;
 137         pev->target = strdup(value);
 138         if (!pev->target)
 139                 return -ENOMEM;
 140         return 0;
 141 }
 142
 143 static int
 144 prog_config__module(const char *value, struct perf_probe_event *pev)
 145 {
 146         pev->uprobes = false;
 147         pev->target = strdup(value);
 148         if (!pev->target)
 149                 return -ENOMEM;
 150         return 0;
 151 }
 152
 153 static int
 154 prog_config__bool(const char *value, bool *pbool, bool invert)
 155 {
 156         int err;
 157         bool bool_value;
 158
 159         if (!pbool)
 160                 return -EINVAL;
 161
 162         err = strtobool(value, &bool_value);
 163         if (err)
 164                 return err;
 165
 166         *pbool = invert ? !bool_value : bool_value;
 167         return 0;
 168 }
 169
 170 static int
 171 prog_config__inlines(const char *value,
 172                      struct perf_probe_event *pev __maybe_unused)
 173 {
 174         return prog_config__bool(value, &probe_conf.no_inlines, true);
 175 }
 176
 177 static int
 178 prog_config__force(const char *value,
 179                    struct perf_probe_event *pev __maybe_unused)
 180 {
 181         return prog_config__bool(value, &probe_conf.force_add, false);
 182 }
 183
 184 static struct {
 185         const char *key;
 186         const char *usage;
 187         const char *desc;
 188         int (*func)(const char *, struct perf_probe_event *);
 189 } bpf_prog_config_terms[] = {
 190         {
 191                 .key    = "exec",
 192                 .usage  = "exec=<full path of file>",
 193                 .desc   = "Set uprobe target",
 194                 .func   = prog_config__exec,
 195         },
 196         {
 197                 .key    = "module",
 198                 .usage  = "module=<module name>    ",
 199                 .desc   = "Set kprobe module",
 200                 .func   = prog_config__module,
 201         },
 202         {
 203                 .key    = "inlines",
 204                 .usage  = "inlines=[yes|no]        ",
 205                 .desc   = "Probe at inline symbol",
 206                 .func   = prog_config__inlines,
 207         },
 208         {
 209                 .key    = "force",
 210                 .usage  = "force=[yes|no]          ",
 211                 .desc   = "Forcibly add events with existing name",
 212                 .func   = prog_config__force,
 213         },
 214 };
 215
 216 static int
 217 do_prog_config(const char *key, const char *value,
 218                struct perf_probe_event *pev)
 219 {
 220         unsigned int i;
 221
 222         pr_debug("config bpf program: %s=%s\n", key, value);
 223         for (i = 0; i < ARRAY_SIZE(bpf_prog_config_terms); i++)
 224                 if (strcmp(key, bpf_prog_config_terms[i].key) == 0)
 225                         return bpf_prog_config_terms[i].func(value, pev);
 226
 227         pr_debug("BPF: ERROR: invalid program config option: %s=%s\n",
 228                  key, value);
 229
 230         pr_debug("\nHint: Valid options are:\n");
 231         for (i = 0; i < ARRAY_SIZE(bpf_prog_config_terms); i++)
 232                 pr_debug("\t%s:\t%s\n", bpf_prog_config_terms[i].usage,
 233                          bpf_prog_config_terms[i].desc);
 234         pr_debug("\n");
 235
 236         return -BPF_LOADER_ERRNO__PROGCONF_TERM;
 237 }
 238
 239 static const char *
 240 parse_prog_config_kvpair(const char *config_str, struct perf_probe_event *pev)
 241 {
 242         char *text = strdup(config_str);
 243         char *sep, *line;
 244         const char *main_str = NULL;
 245         int err = 0;
 246
 247         if (!text) {
 248                 pr_debug("Not enough memory: dup config_str failed\n");
 249                 return ERR_PTR(-ENOMEM);
 250         }
 251
 252         line = text;
 253         while ((sep = strchr(line, ';'))) {
 254                 char *equ;
 255
 256                 *sep = '\0';
 257                 equ = strchr(line, '=');
 258                 if (!equ) {
 259                         pr_warning("WARNING: invalid config in BPF object: %s\n",
 260                                    line);
 261                         pr_warning("\tShould be 'key=value'.\n");
 262                         goto nextline;
 263                 }
 264                 *equ = '\0';
 265
 266                 err = do_prog_config(line, equ + 1, pev);
 267                 if (err)
 268                         break;
 269 nextline:
 270                 line = sep + 1;
 271         }
 272
 273         if (!err)
 274                 main_str = config_str + (line - text);
 275         free(text);
 276
 277         return err ? ERR_PTR(err) : main_str;
 278 }
 279
 280 static int
 281 parse_prog_config(const char *config_str, const char **p_main_str,
 282                   bool *is_tp, struct perf_probe_event *pev)
 283 {
 284         int err;
 285         const char *main_str = parse_prog_config_kvpair(config_str, pev);
 286
 287         if (IS_ERR(main_str))
 288                 return PTR_ERR(main_str);
 289
 290         *p_main_str = main_str;
 291         if (!strchr(main_str, '=')) {
 292                 /* Is a tracepoint event? */
 293                 const char *s = strchr(main_str, ':');
 294
 295                 if (!s) {
 296                         pr_debug("bpf: '%s' is not a valid tracepoint\n",
 297                                  config_str);
 298                         return -BPF_LOADER_ERRNO__CONFIG;
 299                 }
 300
 301                 *is_tp = true;
 302                 return 0;
 303         }
 304
 305         *is_tp = false;
 306         err = parse_perf_probe_command(main_str, pev);
 307         if (err < 0) {
 308                 pr_debug("bpf: '%s' is not a valid config string\n",
 309                          config_str);
 310                 /* parse failed, don't need clear pev. */
 311                 return -BPF_LOADER_ERRNO__CONFIG;
 312         }
 313         return 0;
 314 }
 315
 316 static int
 317 config_bpf_program(struct bpf_program *prog)
 318 {
 319         struct perf_probe_event *pev = NULL;
 320         struct bpf_prog_priv *priv = NULL;
 321         const char *config_str, *main_str;
 322         bool is_tp = false;
 323         int err;
 324
 325         /* Initialize per-program probing setting */
 326         probe_conf.no_inlines = false;
 327         probe_conf.force_add = false;
 328
 329         config_str = bpf_program__title(prog, false);
 330         if (IS_ERR(config_str)) {
 331                 pr_debug("bpf: unable to get title for program\n");
 332                 return PTR_ERR(config_str);
 333         }
 334
 335         priv = calloc(sizeof(*priv), 1);
 336         if (!priv) {
 337                 pr_debug("bpf: failed to alloc priv\n");
 338                 return -ENOMEM;
 339         }
 340         pev = &priv->pev;
 341
 342         pr_debug("bpf: config program '%s'\n", config_str);
 343         err = parse_prog_config(config_str, &main_str, &is_tp, pev);
 344         if (err)
 345                 goto errout;
 346
 347         if (is_tp) {
 348                 char *s = strchr(main_str, ':');
 349
 350                 priv->is_tp = true;
 351                 priv->sys_name = strndup(main_str, s - main_str);
 352                 priv->evt_name = strdup(s + 1);
 353                 goto set_priv;
 354         }
 355
 356         if (pev->group && strcmp(pev->group, PERF_BPF_PROBE_GROUP)) {
 357                 pr_debug("bpf: '%s': group for event is set and not '%s'.\n",
 358                          config_str, PERF_BPF_PROBE_GROUP);
 359                 err = -BPF_LOADER_ERRNO__GROUP;
 360                 goto errout;
 361         } else if (!pev->group)
 362                 pev->group = strdup(PERF_BPF_PROBE_GROUP);
 363
 364         if (!pev->group) {
 365                 pr_debug("bpf: strdup failed\n");
 366                 err = -ENOMEM;
 367                 goto errout;
 368         }
 369
 370         if (!pev->event) {
 371                 pr_debug("bpf: '%s': event name is missing. Section name should be 'key=value'\n",
 372                          config_str);
 373                 err = -BPF_LOADER_ERRNO__EVENTNAME;
 374                 goto errout;
 375         }
 376         pr_debug("bpf: config '%s' is ok\n", config_str);
 377
 378 set_priv:
 379         err = bpf_program__set_priv(prog, priv, clear_prog_priv);
 380         if (err) {
 381                 pr_debug("Failed to set priv for program '%s'\n", config_str);
 382                 goto errout;
 383         }
 384
 385         return 0;
 386
 387 errout:
 388         if (pev)
 389                 clear_perf_probe_event(pev);
 390         free(priv);
 391         return err;
 392 }
 393
 394 static int bpf__prepare_probe(void)
 395 {
 396         static int err = 0;
 397         static bool initialized = false;
 398
 399         /*
 400          * Make err static, so if init failed the first, bpf__prepare_probe()
 401          * fails each time without calling init_probe_symbol_maps multiple
 402          * times.
 403          */
 404         if (initialized)
 405                 return err;
 406
 407         initialized = true;
 408         err = init_probe_symbol_maps(false);
 409         if (err < 0)
 410                 pr_debug("Failed to init_probe_symbol_maps\n");
 411         probe_conf.max_probes = MAX_PROBES;
 412         return err;
 413 }
 414
 415 static int
 416 preproc_gen_prologue(struct bpf_program *prog, int n,
 417                      struct bpf_insn *orig_insns, int orig_insns_cnt,
 418                      struct bpf_prog_prep_result *res)
 419 {
 420         struct bpf_prog_priv *priv = bpf_program__priv(prog);
 421         struct probe_trace_event *tev;
 422         struct perf_probe_event *pev;
 423         struct bpf_insn *buf;
 424         size_t prologue_cnt = 0;
 425         int i, err;
 426
 427         if (IS_ERR(priv) || !priv || priv->is_tp)
 428                 goto errout;
 429
 430         pev = &priv->pev;
 431
 432         if (n < 0 || n >= priv->nr_types)
 433                 goto errout;
 434
 435         /* Find a tev belongs to that type */
 436         for (i = 0; i < pev->ntevs; i++) {
 437                 if (priv->type_mapping[i] == n)
 438                         break;
 439         }
 440
 441         if (i >= pev->ntevs) {
 442                 pr_debug("Internal error: prologue type %d not found\n", n);
 443                 return -BPF_LOADER_ERRNO__PROLOGUE;
 444         }
 445
 446         tev = &pev->tevs[i];
 447
 448         buf = priv->insns_buf;
 449         err = bpf__gen_prologue(tev->args, tev->nargs,
 450                                 buf, &prologue_cnt,
 451                                 BPF_MAXINSNS - orig_insns_cnt);
 452         if (err) {
 453                 const char *title;
 454
 455                 title = bpf_program__title(prog, false);
 456                 if (!title)
 457                         title = "[unknown]";
 458
 459                 pr_debug("Failed to generate prologue for program %s\n",
 460                          title);
 461                 return err;
 462         }
 463
 464         memcpy(&buf[prologue_cnt], orig_insns,
 465                sizeof(struct bpf_insn) * orig_insns_cnt);
 466
 467         res->new_insn_ptr = buf;
 468         res->new_insn_cnt = prologue_cnt + orig_insns_cnt;
 469         res->pfd = NULL;
 470         return 0;
 471
 472 errout:
 473         pr_debug("Internal error in preproc_gen_prologue\n");
 474         return -BPF_LOADER_ERRNO__PROLOGUE;
 475 }
 476
 477 /*
 478  * compare_tev_args is reflexive, transitive and antisymmetric.
 479  * I can proof it but this margin is too narrow to contain.
 480  */
 481 static int compare_tev_args(const void *ptev1, const void *ptev2)
 482 {
 483         int i, ret;
 484         const struct probe_trace_event *tev1 =
 485                 *(const struct probe_trace_event **)ptev1;
 486         const struct probe_trace_event *tev2 =
 487                 *(const struct probe_trace_event **)ptev2;
 488
 489         ret = tev2->nargs - tev1->nargs;
 490         if (ret)
 491                 return ret;
 492
 493         for (i = 0; i < tev1->nargs; i++) {
 494                 struct probe_trace_arg *arg1, *arg2;
 495                 struct probe_trace_arg_ref *ref1, *ref2;
 496
 497                 arg1 = &tev1->args[i];
 498                 arg2 = &tev2->args[i];
 499
 500                 ret = strcmp(arg1->value, arg2->value);
 501                 if (ret)
 502                         return ret;
 503
 504                 ref1 = arg1->ref;
 505                 ref2 = arg2->ref;
 506
 507                 while (ref1 && ref2) {
 508                         ret = ref2->offset - ref1->offset;
 509                         if (ret)
 510                                 return ret;
 511
 512                         ref1 = ref1->next;
 513                         ref2 = ref2->next;
 514                 }
 515
 516                 if (ref1 || ref2)
 517                         return ref2 ? 1 : -1;
 518         }
 519
 520         return 0;
 521 }
 522
 523 /*
 524  * Assign a type number to each tevs in a pev.
 525  * mapping is an array with same slots as tevs in that pev.
 526  * nr_types will be set to number of types.
 527  */
 528 static int map_prologue(struct perf_probe_event *pev, int *mapping,
 529                         int *nr_types)
 530 {
 531         int i, type = 0;
 532         struct probe_trace_event **ptevs;
 533
 534         size_t array_sz = sizeof(*ptevs) * pev->ntevs;
 535
 536         ptevs = malloc(array_sz);
 537         if (!ptevs) {
 538                 pr_debug("Not enough memory: alloc ptevs failed\n");
 539                 return -ENOMEM;
 540         }
 541
 542         pr_debug("In map_prologue, ntevs=%d\n", pev->ntevs);
 543         for (i = 0; i < pev->ntevs; i++)
 544                 ptevs[i] = &pev->tevs[i];
 545
 546         qsort(ptevs, pev->ntevs, sizeof(*ptevs),
 547               compare_tev_args);
 548
 549         for (i = 0; i < pev->ntevs; i++) {
 550                 int n;
 551
 552                 n = ptevs[i] - pev->tevs;
 553                 if (i == 0) {
 554                         mapping[n] = type;
 555                         pr_debug("mapping[%d]=%d\n", n, type);
 556                         continue;
 557                 }
 558
 559                 if (compare_tev_args(ptevs + i, ptevs + i - 1) == 0)
 560                         mapping[n] = type;
 561                 else
 562                         mapping[n] = ++type;
 563
 564                 pr_debug("mapping[%d]=%d\n", n, mapping[n]);
 565         }
 566         free(ptevs);
 567         *nr_types = type + 1;
 568
 569         return 0;
 570 }
 571
 572 static int hook_load_preprocessor(struct bpf_program *prog)
 573 {
 574         struct bpf_prog_priv *priv = bpf_program__priv(prog);
 575         struct perf_probe_event *pev;
 576         bool need_prologue = false;
 577         int err, i;
 578
 579         if (IS_ERR(priv) || !priv) {
 580                 pr_debug("Internal error when hook preprocessor\n");
 581                 return -BPF_LOADER_ERRNO__INTERNAL;
 582         }
 583
 584         if (priv->is_tp) {
 585                 priv->need_prologue = false;
 586                 return 0;
 587         }
 588
 589         pev = &priv->pev;
 590         for (i = 0; i < pev->ntevs; i++) {
 591                 struct probe_trace_event *tev = &pev->tevs[i];
 592
 593                 if (tev->nargs > 0) {
 594                         need_prologue = true;
 595                         break;
 596                 }
 597         }
 598
 599         /*
 600          * Since all tevs don't have argument, we don't need generate
 601          * prologue.
 602          */
 603         if (!need_prologue) {
 604                 priv->need_prologue = false;
 605                 return 0;
 606         }
 607
 608         priv->need_prologue = true;
 609         priv->insns_buf = malloc(sizeof(struct bpf_insn) * BPF_MAXINSNS);
 610         if (!priv->insns_buf) {
 611                 pr_debug("Not enough memory: alloc insns_buf failed\n");
 612                 return -ENOMEM;
 613         }
 614
 615         priv->type_mapping = malloc(sizeof(int) * pev->ntevs);
 616         if (!priv->type_mapping) {
 617                 pr_debug("Not enough memory: alloc type_mapping failed\n");
 618                 return -ENOMEM;
 619         }
 620         memset(priv->type_mapping, -1,
 621                sizeof(int) * pev->ntevs);
 622
 623         err = map_prologue(pev, priv->type_mapping, &priv->nr_types);
 624         if (err)
 625                 return err;
 626
 627         err = bpf_program__set_prep(prog, priv->nr_types,
 628                                     preproc_gen_prologue);
 629         return err;
 630 }
 631
 632 int bpf__probe(struct bpf_object *obj)
 633 {
 634         int err = 0;
 635         struct bpf_program *prog;
 636         struct bpf_prog_priv *priv;
 637         struct perf_probe_event *pev;
 638
 639         err = bpf__prepare_probe();
 640         if (err) {
 641                 pr_debug("bpf__prepare_probe failed\n");
 642                 return err;
 643         }
 644
 645         bpf_object__for_each_program(prog, obj) {
 646                 err = config_bpf_program(prog);
 647                 if (err)
 648                         goto out;
 649
 650                 priv = bpf_program__priv(prog);
 651                 if (IS_ERR(priv) || !priv) {
 652                         err = PTR_ERR(priv);
 653                         goto out;
 654                 }
 655
 656                 if (priv->is_tp) {
 657                         bpf_program__set_tracepoint(prog);
 658                         continue;
 659                 }
 660
 661                 bpf_program__set_kprobe(prog);
 662                 pev = &priv->pev;
 663
 664                 err = convert_perf_probe_events(pev, 1);
 665                 if (err < 0) {
 666                         pr_debug("bpf_probe: failed to convert perf probe events");
 667                         goto out;
 668                 }
 669
 670                 err = apply_perf_probe_events(pev, 1);
 671                 if (err < 0) {
 672                         pr_debug("bpf_probe: failed to apply perf probe events");
 673                         goto out;
 674                 }
 675
 676                 /*
 677                  * After probing, let's consider prologue, which
 678                  * adds program fetcher to BPF programs.
 679                  *
 680                  * hook_load_preprocessorr() hooks pre-processor
 681                  * to bpf_program, let it generate prologue
 682                  * dynamically during loading.
 683                  */
 684                 err = hook_load_preprocessor(prog);
 685                 if (err)
 686                         goto out;
 687         }
 688 out:
 689         return err < 0 ? err : 0;
 690 }
 691
 692 #define EVENTS_WRITE_BUFSIZE  4096
 693 int bpf__unprobe(struct bpf_object *obj)
 694 {
 695         int err, ret = 0;
 696         struct bpf_program *prog;
 697
 698         bpf_object__for_each_program(prog, obj) {
 699                 struct bpf_prog_priv *priv = bpf_program__priv(prog);
 700                 int i;
 701
 702                 if (IS_ERR(priv) || !priv || priv->is_tp)
 703                         continue;
 704
 705                 for (i = 0; i < priv->pev.ntevs; i++) {
 706                         struct probe_trace_event *tev = &priv->pev.tevs[i];
 707                         char name_buf[EVENTS_WRITE_BUFSIZE];
 708                         struct strfilter *delfilter;
 709
 710                         snprintf(name_buf, EVENTS_WRITE_BUFSIZE,
 711                                  "%s:%s", tev->group, tev->event);
 712                         name_buf[EVENTS_WRITE_BUFSIZE - 1] = '\0';
 713
 714                         delfilter = strfilter__new(name_buf, NULL);
 715                         if (!delfilter) {
 716                                 pr_debug("Failed to create filter for unprobing\n");
 717                                 ret = -ENOMEM;
 718                                 continue;
 719                         }
 720
 721                         err = del_perf_probe_events(delfilter);
 722                         strfilter__delete(delfilter);
 723                         if (err) {
 724                                 pr_debug("Failed to delete %s\n", name_buf);
 725                                 ret = err;
 726                                 continue;
 727                         }
 728                 }
 729         }
 730         return ret;
 731 }
 732
 733 int bpf__load(struct bpf_object *obj)
 734 {
 735         int err;
 736
 737         err = bpf_object__load(obj);
 738         if (err) {
 739                 pr_debug("bpf: load objects failed\n");
 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 (!prefixcmp(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_map__for_each(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_map__for_each(pos, obj)
1518
1519 #define bpf__for_each_stdout_map(pos, obj, objtmp)      \
1520         bpf__for_each_map(pos, obj, objtmp)             \
1521                 if (bpf_map__name(pos) &&               \
1522                         (strcmp("__bpf_stdout__",       \
1523                                 bpf_map__name(pos)) == 0))
1524
1525 int bpf__setup_stdout(struct perf_evlist *evlist __maybe_unused)
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_stdout_map(map, obj, tmp) {
1535                 struct bpf_map_priv *priv = bpf_map__priv(map);
1536
1537                 if (IS_ERR(priv))
1538                         return -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 0;
1552
1553         if (!tmpl_priv) {
1554                 err = parse_events(evlist, "bpf-output/no-inherit=1,name=__bpf_stdout__/",
1555                                    NULL);
1556                 if (err) {
1557                         pr_debug("ERROR: failed to create bpf-output event\n");
1558                         return -err;
1559                 }
1560
1561                 evsel = perf_evlist__last(evlist);
1562         }
1563
1564         bpf__for_each_stdout_map(map, obj, tmp) {
1565                 struct bpf_map_priv *priv = bpf_map__priv(map);
1566
1567                 if (IS_ERR(priv))
1568                         return -BPF_LOADER_ERRNO__INTERNAL;
1569                 if (priv)
1570                         continue;
1571
1572                 if (tmpl_priv) {
1573                         priv = bpf_map_priv__clone(tmpl_priv);
1574                         if (!priv)
1575                                 return -ENOMEM;
1576
1577                         err = bpf_map__set_priv(map, priv, bpf_map_priv__clear);
1578                         if (err) {
1579                                 bpf_map_priv__clear(map, priv);
1580                                 return err;
1581                         }
1582                 } else if (evsel) {
1583                         struct bpf_map_op *op;
1584
1585                         op = bpf_map__add_newop(map, NULL);
1586                         if (IS_ERR(op))
1587                                 return PTR_ERR(op);
1588                         op->op_type = BPF_MAP_OP_SET_EVSEL;
1589                         op->v.evsel = evsel;
1590                 }
1591         }
1592
1593         return 0;
1594 }
1595
1596 #define ERRNO_OFFSET(e)         ((e) - __BPF_LOADER_ERRNO__START)
1597 #define ERRCODE_OFFSET(c)       ERRNO_OFFSET(BPF_LOADER_ERRNO__##c)
1598 #define NR_ERRNO        (__BPF_LOADER_ERRNO__END - __BPF_LOADER_ERRNO__START)
1599
1600 static const char *bpf_loader_strerror_table[NR_ERRNO] = {
1601         [ERRCODE_OFFSET(CONFIG)]        = "Invalid config string",
1602         [ERRCODE_OFFSET(GROUP)]         = "Invalid group name",
1603         [ERRCODE_OFFSET(EVENTNAME)]     = "No event name found in config string",
1604         [ERRCODE_OFFSET(INTERNAL)]      = "BPF loader internal error",
1605         [ERRCODE_OFFSET(COMPILE)]       = "Error when compiling BPF scriptlet",
1606         [ERRCODE_OFFSET(PROGCONF_TERM)] = "Invalid program config term in config string",
1607         [ERRCODE_OFFSET(PROLOGUE)]      = "Failed to generate prologue",
1608         [ERRCODE_OFFSET(PROLOGUE2BIG)]  = "Prologue too big for program",
1609         [ERRCODE_OFFSET(PROLOGUEOOB)]   = "Offset out of bound for prologue",
1610         [ERRCODE_OFFSET(OBJCONF_OPT)]   = "Invalid object config option",
1611         [ERRCODE_OFFSET(OBJCONF_CONF)]  = "Config value not set (missing '=')",
1612         [ERRCODE_OFFSET(OBJCONF_MAP_OPT)]       = "Invalid object map config option",
1613         [ERRCODE_OFFSET(OBJCONF_MAP_NOTEXIST)]  = "Target map doesn't exist",
1614         [ERRCODE_OFFSET(OBJCONF_MAP_VALUE)]     = "Incorrect value type for map",
1615         [ERRCODE_OFFSET(OBJCONF_MAP_TYPE)]      = "Incorrect map type",
1616         [ERRCODE_OFFSET(OBJCONF_MAP_KEYSIZE)]   = "Incorrect map key size",
1617         [ERRCODE_OFFSET(OBJCONF_MAP_VALUESIZE)] = "Incorrect map value size",
1618         [ERRCODE_OFFSET(OBJCONF_MAP_NOEVT)]     = "Event not found for map setting",
1619         [ERRCODE_OFFSET(OBJCONF_MAP_MAPSIZE)]   = "Invalid map size for event setting",
1620         [ERRCODE_OFFSET(OBJCONF_MAP_EVTDIM)]    = "Event dimension too large",
1621         [ERRCODE_OFFSET(OBJCONF_MAP_EVTINH)]    = "Doesn't support inherit event",
1622         [ERRCODE_OFFSET(OBJCONF_MAP_EVTTYPE)]   = "Wrong event type for map",
1623         [ERRCODE_OFFSET(OBJCONF_MAP_IDX2BIG)]   = "Index too large",
1624 };
1625
1626 static int
1627 bpf_loader_strerror(int err, char *buf, size_t size)
1628 {
1629         char sbuf[STRERR_BUFSIZE];
1630         const char *msg;
1631
1632         if (!buf || !size)
1633                 return -1;
1634
1635         err = err > 0 ? err : -err;
1636
1637         if (err >= __LIBBPF_ERRNO__START)
1638                 return libbpf_strerror(err, buf, size);
1639
1640         if (err >= __BPF_LOADER_ERRNO__START && err < __BPF_LOADER_ERRNO__END) {
1641                 msg = bpf_loader_strerror_table[ERRNO_OFFSET(err)];
1642                 snprintf(buf, size, "%s", msg);
1643                 buf[size - 1] = '\0';
1644                 return 0;
1645         }
1646
1647         if (err >= __BPF_LOADER_ERRNO__END)
1648                 snprintf(buf, size, "Unknown bpf loader error %d", err);
1649         else
1650                 snprintf(buf, size, "%s",
1651                          str_error_r(err, sbuf, sizeof(sbuf)));
1652
1653         buf[size - 1] = '\0';
1654         return -1;
1655 }
1656
1657 #define bpf__strerror_head(err, buf, size) \
1658         char sbuf[STRERR_BUFSIZE], *emsg;\
1659         if (!size)\
1660                 return 0;\
1661         if (err < 0)\
1662                 err = -err;\
1663         bpf_loader_strerror(err, sbuf, sizeof(sbuf));\
1664         emsg = sbuf;\
1665         switch (err) {\
1666         default:\
1667                 scnprintf(buf, size, "%s", emsg);\
1668                 break;
1669
1670 #define bpf__strerror_entry(val, fmt...)\
1671         case val: {\
1672                 scnprintf(buf, size, fmt);\
1673                 break;\
1674         }
1675
1676 #define bpf__strerror_end(buf, size)\
1677         }\
1678         buf[size - 1] = '\0';
1679
1680 int bpf__strerror_prepare_load(const char *filename, bool source,
1681                                int err, char *buf, size_t size)
1682 {
1683         size_t n;
1684         int ret;
1685
1686         n = snprintf(buf, size, "Failed to load %s%s: ",
1687                          filename, source ? " from source" : "");
1688         if (n >= size) {
1689                 buf[size - 1] = '\0';
1690                 return 0;
1691         }
1692         buf += n;
1693         size -= n;
1694
1695         ret = bpf_loader_strerror(err, buf, size);
1696         buf[size - 1] = '\0';
1697         return ret;
1698 }
1699
1700 int bpf__strerror_probe(struct bpf_object *obj __maybe_unused,
1701                         int err, char *buf, size_t size)
1702 {
1703         bpf__strerror_head(err, buf, size);
1704         case BPF_LOADER_ERRNO__PROGCONF_TERM: {
1705                 scnprintf(buf, size, "%s (add -v to see detail)", emsg);
1706                 break;
1707         }
1708         bpf__strerror_entry(EEXIST, "Probe point exist. Try 'perf probe -d \"*\"' and set 'force=yes'");
1709         bpf__strerror_entry(EACCES, "You need to be root");
1710         bpf__strerror_entry(EPERM, "You need to be root, and /proc/sys/kernel/kptr_restrict should be 0");
1711         bpf__strerror_entry(ENOENT, "You need to check probing points in BPF file");
1712         bpf__strerror_end(buf, size);
1713         return 0;
1714 }
1715
1716 int bpf__strerror_load(struct bpf_object *obj,
1717                        int err, char *buf, size_t size)
1718 {
1719         bpf__strerror_head(err, buf, size);
1720         case LIBBPF_ERRNO__KVER: {
1721                 unsigned int obj_kver = bpf_object__kversion(obj);
1722                 unsigned int real_kver;
1723
1724                 if (fetch_kernel_version(&real_kver, NULL, 0)) {
1725                         scnprintf(buf, size, "Unable to fetch kernel version");
1726                         break;
1727                 }
1728
1729                 if (obj_kver != real_kver) {
1730                         scnprintf(buf, size,
1731                                   "'version' ("KVER_FMT") doesn't match running kernel ("KVER_FMT")",
1732                                   KVER_PARAM(obj_kver),
1733                                   KVER_PARAM(real_kver));
1734                         break;
1735                 }
1736
1737                 scnprintf(buf, size, "Failed to load program for unknown reason");
1738                 break;
1739         }
1740         bpf__strerror_end(buf, size);
1741         return 0;
1742 }
1743
1744 int bpf__strerror_config_obj(struct bpf_object *obj __maybe_unused,
1745                              struct parse_events_term *term __maybe_unused,
1746                              struct perf_evlist *evlist __maybe_unused,
1747                              int *error_pos __maybe_unused, int err,
1748                              char *buf, size_t size)
1749 {
1750         bpf__strerror_head(err, buf, size);
1751         bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE,
1752                             "Can't use this config term with this map type");
1753         bpf__strerror_end(buf, size);
1754         return 0;
1755 }
1756
1757 int bpf__strerror_apply_obj_config(int err, char *buf, size_t size)
1758 {
1759         bpf__strerror_head(err, buf, size);
1760         bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_EVTDIM,
1761                             "Cannot set event to BPF map in multi-thread tracing");
1762         bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_EVTINH,
1763                             "%s (Hint: use -i to turn off inherit)", emsg);
1764         bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_EVTTYPE,
1765                             "Can only put raw, hardware and BPF output event into a BPF map");
1766         bpf__strerror_end(buf, size);
1767         return 0;
1768 }
1769
1770 int bpf__strerror_setup_stdout(struct perf_evlist *evlist __maybe_unused,
1771                                int err, char *buf, size_t size)
1772 {
1773         bpf__strerror_head(err, buf, size);
1774         bpf__strerror_end(buf, size);
1775         return 0;
1776 }