~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/tools/perf/util/bpf-loader.c

Version: ~ [ linux-4.16-rc2 ] ~ [ linux-4.15.4 ] ~ [ linux-4.14.20 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.82 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.116 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.49 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.95 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.54 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.99 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.27.62 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

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

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp