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