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Linux/tools/perf/util/bpf-loader.c

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

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