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Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux...
[linux/fpc-iii.git] / tools / perf / util / bpf-loader.c
blob0967ce601931685ed294827e8aef7c30c47736c6
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 int
846 bpf_map__add_op(struct bpf_map *map, struct bpf_map_op *op)
847 {
848 struct bpf_map_priv *priv;
849 const char *map_name;
850 int err;
851
852 map_name = bpf_map__get_name(map);
853 err = bpf_map__get_private(map, (void **)&priv);
854 if (err) {
855 pr_debug("Failed to get private from map %s\n", map_name);
856 return err;
857 }
858
859 if (!priv) {
860 priv = zalloc(sizeof(*priv));
861 if (!priv) {
862 pr_debug("No enough memory to alloc map private\n");
863 return -ENOMEM;
864 }
865 INIT_LIST_HEAD(&priv->ops_list);
866
867 if (bpf_map__set_private(map, priv, bpf_map_priv__clear)) {
868 free(priv);
869 return -BPF_LOADER_ERRNO__INTERNAL;
870 }
871 }
872
873 list_add_tail(&op->list, &priv->ops_list);
874 return 0;
875 }
876
877 static struct bpf_map_op *
878 bpf_map__add_newop(struct bpf_map *map, struct parse_events_term *term)
879 {
880 struct bpf_map_op *op;
881 int err;
882
883 op = bpf_map_op__new(term);
884 if (IS_ERR(op))
885 return op;
886
887 err = bpf_map__add_op(map, op);
888 if (err) {
889 bpf_map_op__delete(op);
890 return ERR_PTR(err);
891 }
892 return op;
893 }
894
895 static int
896 __bpf_map__config_value(struct bpf_map *map,
897 struct parse_events_term *term)
898 {
899 struct bpf_map_def def;
900 struct bpf_map_op *op;
901 const char *map_name;
902 int err;
903
904 map_name = bpf_map__get_name(map);
905
906 err = bpf_map__get_def(map, &def);
907 if (err) {
908 pr_debug("Unable to get map definition from '%s'\n",
909 map_name);
910 return -BPF_LOADER_ERRNO__INTERNAL;
911 }
912
913 if (def.type != BPF_MAP_TYPE_ARRAY) {
914 pr_debug("Map %s type is not BPF_MAP_TYPE_ARRAY\n",
915 map_name);
916 return -BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE;
917 }
918 if (def.key_size < sizeof(unsigned int)) {
919 pr_debug("Map %s has incorrect key size\n", map_name);
920 return -BPF_LOADER_ERRNO__OBJCONF_MAP_KEYSIZE;
921 }
922 switch (def.value_size) {
923 case 1:
924 case 2:
925 case 4:
926 case 8:
927 break;
928 default:
929 pr_debug("Map %s has incorrect value size\n", map_name);
930 return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUESIZE;
931 }
932
933 op = bpf_map__add_newop(map, term);
934 if (IS_ERR(op))
935 return PTR_ERR(op);
936 op->op_type = BPF_MAP_OP_SET_VALUE;
937 op->v.value = term->val.num;
938 return 0;
939 }
940
941 static int
942 bpf_map__config_value(struct bpf_map *map,
943 struct parse_events_term *term,
944 struct perf_evlist *evlist __maybe_unused)
945 {
946 if (!term->err_val) {
947 pr_debug("Config value not set\n");
948 return -BPF_LOADER_ERRNO__OBJCONF_CONF;
949 }
950
951 if (term->type_val != PARSE_EVENTS__TERM_TYPE_NUM) {
952 pr_debug("ERROR: wrong value type for 'value'\n");
953 return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUE;
954 }
955
956 return __bpf_map__config_value(map, term);
957 }
958
959 static int
960 __bpf_map__config_event(struct bpf_map *map,
961 struct parse_events_term *term,
962 struct perf_evlist *evlist)
963 {
964 struct perf_evsel *evsel;
965 struct bpf_map_def def;
966 struct bpf_map_op *op;
967 const char *map_name;
968 int err;
969
970 map_name = bpf_map__get_name(map);
971 evsel = perf_evlist__find_evsel_by_str(evlist, term->val.str);
972 if (!evsel) {
973 pr_debug("Event (for '%s') '%s' doesn't exist\n",
974 map_name, term->val.str);
975 return -BPF_LOADER_ERRNO__OBJCONF_MAP_NOEVT;
976 }
977
978 err = bpf_map__get_def(map, &def);
979 if (err) {
980 pr_debug("Unable to get map definition from '%s'\n",
981 map_name);
982 return err;
983 }
984
985 /*
986 * No need to check key_size and value_size:
987 * kernel has already checked them.
988 */
989 if (def.type != BPF_MAP_TYPE_PERF_EVENT_ARRAY) {
990 pr_debug("Map %s type is not BPF_MAP_TYPE_PERF_EVENT_ARRAY\n",
991 map_name);
992 return -BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE;
993 }
994
995 op = bpf_map__add_newop(map, term);
996 if (IS_ERR(op))
997 return PTR_ERR(op);
998 op->op_type = BPF_MAP_OP_SET_EVSEL;
999 op->v.evsel = evsel;
1000 return 0;
1001 }
1002
1003 static int
1004 bpf_map__config_event(struct bpf_map *map,
1005 struct parse_events_term *term,
1006 struct perf_evlist *evlist)
1007 {
1008 if (!term->err_val) {
1009 pr_debug("Config value not set\n");
1010 return -BPF_LOADER_ERRNO__OBJCONF_CONF;
1011 }
1012
1013 if (term->type_val != PARSE_EVENTS__TERM_TYPE_STR) {
1014 pr_debug("ERROR: wrong value type for 'event'\n");
1015 return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUE;
1016 }
1017
1018 return __bpf_map__config_event(map, term, evlist);
1019 }
1020
1021 struct bpf_obj_config__map_func {
1022 const char *config_opt;
1023 int (*config_func)(struct bpf_map *, struct parse_events_term *,
1024 struct perf_evlist *);
1025 };
1026
1027 struct bpf_obj_config__map_func bpf_obj_config__map_funcs[] = {
1028 {"value", bpf_map__config_value},
1029 {"event", bpf_map__config_event},
1030 };
1031
1032 static int
1033 config_map_indices_range_check(struct parse_events_term *term,
1034 struct bpf_map *map,
1035 const char *map_name)
1036 {
1037 struct parse_events_array *array = &term->array;
1038 struct bpf_map_def def;
1039 unsigned int i;
1040 int err;
1041
1042 if (!array->nr_ranges)
1043 return 0;
1044 if (!array->ranges) {
1045 pr_debug("ERROR: map %s: array->nr_ranges is %d but range array is NULL\n",
1046 map_name, (int)array->nr_ranges);
1047 return -BPF_LOADER_ERRNO__INTERNAL;
1048 }
1049
1050 err = bpf_map__get_def(map, &def);
1051 if (err) {
1052 pr_debug("ERROR: Unable to get map definition from '%s'\n",
1053 map_name);
1054 return -BPF_LOADER_ERRNO__INTERNAL;
1055 }
1056
1057 for (i = 0; i < array->nr_ranges; i++) {
1058 unsigned int start = array->ranges[i].start;
1059 size_t length = array->ranges[i].length;
1060 unsigned int idx = start + length - 1;
1061
1062 if (idx >= def.max_entries) {
1063 pr_debug("ERROR: index %d too large\n", idx);
1064 return -BPF_LOADER_ERRNO__OBJCONF_MAP_IDX2BIG;
1065 }
1066 }
1067 return 0;
1068 }
1069
1070 static int
1071 bpf__obj_config_map(struct bpf_object *obj,
1072 struct parse_events_term *term,
1073 struct perf_evlist *evlist,
1074 int *key_scan_pos)
1075 {
1076 /* key is "map:<mapname>.<config opt>" */
1077 char *map_name = strdup(term->config + sizeof("map:") - 1);
1078 struct bpf_map *map;
1079 int err = -BPF_LOADER_ERRNO__OBJCONF_OPT;
1080 char *map_opt;
1081 size_t i;
1082
1083 if (!map_name)
1084 return -ENOMEM;
1085
1086 map_opt = strchr(map_name, '.');
1087 if (!map_opt) {
1088 pr_debug("ERROR: Invalid map config: %s\n", map_name);
1089 goto out;
1090 }
1091
1092 *map_opt++ = '\0';
1093 if (*map_opt == '\0') {
1094 pr_debug("ERROR: Invalid map option: %s\n", term->config);
1095 goto out;
1096 }
1097
1098 map = bpf_object__get_map_by_name(obj, map_name);
1099 if (!map) {
1100 pr_debug("ERROR: Map %s doesn't exist\n", map_name);
1101 err = -BPF_LOADER_ERRNO__OBJCONF_MAP_NOTEXIST;
1102 goto out;
1103 }
1104
1105 *key_scan_pos += strlen(map_opt);
1106 err = config_map_indices_range_check(term, map, map_name);
1107 if (err)
1108 goto out;
1109 *key_scan_pos -= strlen(map_opt);
1110
1111 for (i = 0; i < ARRAY_SIZE(bpf_obj_config__map_funcs); i++) {
1112 struct bpf_obj_config__map_func *func =
1113 &bpf_obj_config__map_funcs[i];
1114
1115 if (strcmp(map_opt, func->config_opt) == 0) {
1116 err = func->config_func(map, term, evlist);
1117 goto out;
1118 }
1119 }
1120
1121 pr_debug("ERROR: Invalid map config option '%s'\n", map_opt);
1122 err = -BPF_LOADER_ERRNO__OBJCONF_MAP_OPT;
1123 out:
1124 free(map_name);
1125 if (!err)
1126 key_scan_pos += strlen(map_opt);
1127 return err;
1128 }
1129
1130 int bpf__config_obj(struct bpf_object *obj,
1131 struct parse_events_term *term,
1132 struct perf_evlist *evlist,
1133 int *error_pos)
1134 {
1135 int key_scan_pos = 0;
1136 int err;
1137
1138 if (!obj || !term || !term->config)
1139 return -EINVAL;
1140
1141 if (!prefixcmp(term->config, "map:")) {
1142 key_scan_pos = sizeof("map:") - 1;
1143 err = bpf__obj_config_map(obj, term, evlist, &key_scan_pos);
1144 goto out;
1145 }
1146 err = -BPF_LOADER_ERRNO__OBJCONF_OPT;
1147 out:
1148 if (error_pos)
1149 *error_pos = key_scan_pos;
1150 return err;
1151
1152 }
1153
1154 typedef int (*map_config_func_t)(const char *name, int map_fd,
1155 struct bpf_map_def *pdef,
1156 struct bpf_map_op *op,
1157 void *pkey, void *arg);
1158
1159 static int
1160 foreach_key_array_all(map_config_func_t func,
1161 void *arg, const char *name,
1162 int map_fd, struct bpf_map_def *pdef,
1163 struct bpf_map_op *op)
1164 {
1165 unsigned int i;
1166 int err;
1167
1168 for (i = 0; i < pdef->max_entries; i++) {
1169 err = func(name, map_fd, pdef, op, &i, arg);
1170 if (err) {
1171 pr_debug("ERROR: failed to insert value to %s[%u]\n",
1172 name, i);
1173 return err;
1174 }
1175 }
1176 return 0;
1177 }
1178
1179 static int
1180 foreach_key_array_ranges(map_config_func_t func, void *arg,
1181 const char *name, int map_fd,
1182 struct bpf_map_def *pdef,
1183 struct bpf_map_op *op)
1184 {
1185 unsigned int i, j;
1186 int err;
1187
1188 for (i = 0; i < op->k.array.nr_ranges; i++) {
1189 unsigned int start = op->k.array.ranges[i].start;
1190 size_t length = op->k.array.ranges[i].length;
1191
1192 for (j = 0; j < length; j++) {
1193 unsigned int idx = start + j;
1194
1195 err = func(name, map_fd, pdef, op, &idx, arg);
1196 if (err) {
1197 pr_debug("ERROR: failed to insert value to %s[%u]\n",
1198 name, idx);
1199 return err;
1200 }
1201 }
1202 }
1203 return 0;
1204 }
1205
1206 static int
1207 bpf_map_config_foreach_key(struct bpf_map *map,
1208 map_config_func_t func,
1209 void *arg)
1210 {
1211 int err, map_fd;
1212 const char *name;
1213 struct bpf_map_op *op;
1214 struct bpf_map_def def;
1215 struct bpf_map_priv *priv;
1216
1217 name = bpf_map__get_name(map);
1218
1219 err = bpf_map__get_private(map, (void **)&priv);
1220 if (err) {
1221 pr_debug("ERROR: failed to get private from map %s\n", name);
1222 return -BPF_LOADER_ERRNO__INTERNAL;
1223 }
1224 if (!priv || list_empty(&priv->ops_list)) {
1225 pr_debug("INFO: nothing to config for map %s\n", name);
1226 return 0;
1227 }
1228
1229 err = bpf_map__get_def(map, &def);
1230 if (err) {
1231 pr_debug("ERROR: failed to get definition from map %s\n", name);
1232 return -BPF_LOADER_ERRNO__INTERNAL;
1233 }
1234 map_fd = bpf_map__get_fd(map);
1235 if (map_fd < 0) {
1236 pr_debug("ERROR: failed to get fd from map %s\n", name);
1237 return map_fd;
1238 }
1239
1240 list_for_each_entry(op, &priv->ops_list, list) {
1241 switch (def.type) {
1242 case BPF_MAP_TYPE_ARRAY:
1243 case BPF_MAP_TYPE_PERF_EVENT_ARRAY:
1244 switch (op->key_type) {
1245 case BPF_MAP_KEY_ALL:
1246 err = foreach_key_array_all(func, arg, name,
1247 map_fd, &def, op);
1248 break;
1249 case BPF_MAP_KEY_RANGES:
1250 err = foreach_key_array_ranges(func, arg, name,
1251 map_fd, &def,
1252 op);
1253 break;
1254 default:
1255 pr_debug("ERROR: keytype for map '%s' invalid\n",
1256 name);
1257 return -BPF_LOADER_ERRNO__INTERNAL;
1258 }
1259 if (err)
1260 return err;
1261 break;
1262 default:
1263 pr_debug("ERROR: type of '%s' incorrect\n", name);
1264 return -BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE;
1265 }
1266 }
1267
1268 return 0;
1269 }
1270
1271 static int
1272 apply_config_value_for_key(int map_fd, void *pkey,
1273 size_t val_size, u64 val)
1274 {
1275 int err = 0;
1276
1277 switch (val_size) {
1278 case 1: {
1279 u8 _val = (u8)(val);
1280 err = bpf_map_update_elem(map_fd, pkey, &_val, BPF_ANY);
1281 break;
1282 }
1283 case 2: {
1284 u16 _val = (u16)(val);
1285 err = bpf_map_update_elem(map_fd, pkey, &_val, BPF_ANY);
1286 break;
1287 }
1288 case 4: {
1289 u32 _val = (u32)(val);
1290 err = bpf_map_update_elem(map_fd, pkey, &_val, BPF_ANY);
1291 break;
1292 }
1293 case 8: {
1294 err = bpf_map_update_elem(map_fd, pkey, &val, BPF_ANY);
1295 break;
1296 }
1297 default:
1298 pr_debug("ERROR: invalid value size\n");
1299 return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUESIZE;
1300 }
1301 if (err && errno)
1302 err = -errno;
1303 return err;
1304 }
1305
1306 static int
1307 apply_config_evsel_for_key(const char *name, int map_fd, void *pkey,
1308 struct perf_evsel *evsel)
1309 {
1310 struct xyarray *xy = evsel->fd;
1311 struct perf_event_attr *attr;
1312 unsigned int key, events;
1313 bool check_pass = false;
1314 int *evt_fd;
1315 int err;
1316
1317 if (!xy) {
1318 pr_debug("ERROR: evsel not ready for map %s\n", name);
1319 return -BPF_LOADER_ERRNO__INTERNAL;
1320 }
1321
1322 if (xy->row_size / xy->entry_size != 1) {
1323 pr_debug("ERROR: Dimension of target event is incorrect for map %s\n",
1324 name);
1325 return -BPF_LOADER_ERRNO__OBJCONF_MAP_EVTDIM;
1326 }
1327
1328 attr = &evsel->attr;
1329 if (attr->inherit) {
1330 pr_debug("ERROR: Can't put inherit event into map %s\n", name);
1331 return -BPF_LOADER_ERRNO__OBJCONF_MAP_EVTINH;
1332 }
1333
1334 if (perf_evsel__is_bpf_output(evsel))
1335 check_pass = true;
1336 if (attr->type == PERF_TYPE_RAW)
1337 check_pass = true;
1338 if (attr->type == PERF_TYPE_HARDWARE)
1339 check_pass = true;
1340 if (!check_pass) {
1341 pr_debug("ERROR: Event type is wrong for map %s\n", name);
1342 return -BPF_LOADER_ERRNO__OBJCONF_MAP_EVTTYPE;
1343 }
1344
1345 events = xy->entries / (xy->row_size / xy->entry_size);
1346 key = *((unsigned int *)pkey);
1347 if (key >= events) {
1348 pr_debug("ERROR: there is no event %d for map %s\n",
1349 key, name);
1350 return -BPF_LOADER_ERRNO__OBJCONF_MAP_MAPSIZE;
1351 }
1352 evt_fd = xyarray__entry(xy, key, 0);
1353 err = bpf_map_update_elem(map_fd, pkey, evt_fd, BPF_ANY);
1354 if (err && errno)
1355 err = -errno;
1356 return err;
1357 }
1358
1359 static int
1360 apply_obj_config_map_for_key(const char *name, int map_fd,
1361 struct bpf_map_def *pdef __maybe_unused,
1362 struct bpf_map_op *op,
1363 void *pkey, void *arg __maybe_unused)
1364 {
1365 int err;
1366
1367 switch (op->op_type) {
1368 case BPF_MAP_OP_SET_VALUE:
1369 err = apply_config_value_for_key(map_fd, pkey,
1370 pdef->value_size,
1371 op->v.value);
1372 break;
1373 case BPF_MAP_OP_SET_EVSEL:
1374 err = apply_config_evsel_for_key(name, map_fd, pkey,
1375 op->v.evsel);
1376 break;
1377 default:
1378 pr_debug("ERROR: unknown value type for '%s'\n", name);
1379 err = -BPF_LOADER_ERRNO__INTERNAL;
1380 }
1381 return err;
1382 }
1383
1384 static int
1385 apply_obj_config_map(struct bpf_map *map)
1386 {
1387 return bpf_map_config_foreach_key(map,
1388 apply_obj_config_map_for_key,
1389 NULL);
1390 }
1391
1392 static int
1393 apply_obj_config_object(struct bpf_object *obj)
1394 {
1395 struct bpf_map *map;
1396 int err;
1397
1398 bpf_map__for_each(map, obj) {
1399 err = apply_obj_config_map(map);
1400 if (err)
1401 return err;
1402 }
1403 return 0;
1404 }
1405
1406 int bpf__apply_obj_config(void)
1407 {
1408 struct bpf_object *obj, *tmp;
1409 int err;
1410
1411 bpf_object__for_each_safe(obj, tmp) {
1412 err = apply_obj_config_object(obj);
1413 if (err)
1414 return err;
1415 }
1416
1417 return 0;
1418 }
1419
1420 #define ERRNO_OFFSET(e) ((e) - __BPF_LOADER_ERRNO__START)
1421 #define ERRCODE_OFFSET(c) ERRNO_OFFSET(BPF_LOADER_ERRNO__##c)
1422 #define NR_ERRNO (__BPF_LOADER_ERRNO__END - __BPF_LOADER_ERRNO__START)
1423
1424 static const char *bpf_loader_strerror_table[NR_ERRNO] = {
1425 [ERRCODE_OFFSET(CONFIG)] = "Invalid config string",
1426 [ERRCODE_OFFSET(GROUP)] = "Invalid group name",
1427 [ERRCODE_OFFSET(EVENTNAME)] = "No event name found in config string",
1428 [ERRCODE_OFFSET(INTERNAL)] = "BPF loader internal error",
1429 [ERRCODE_OFFSET(COMPILE)] = "Error when compiling BPF scriptlet",
1430 [ERRCODE_OFFSET(PROGCONF_TERM)] = "Invalid program config term in config string",
1431 [ERRCODE_OFFSET(PROLOGUE)] = "Failed to generate prologue",
1432 [ERRCODE_OFFSET(PROLOGUE2BIG)] = "Prologue too big for program",
1433 [ERRCODE_OFFSET(PROLOGUEOOB)] = "Offset out of bound for prologue",
1434 [ERRCODE_OFFSET(OBJCONF_OPT)] = "Invalid object config option",
1435 [ERRCODE_OFFSET(OBJCONF_CONF)] = "Config value not set (missing '=')",
1436 [ERRCODE_OFFSET(OBJCONF_MAP_OPT)] = "Invalid object map config option",
1437 [ERRCODE_OFFSET(OBJCONF_MAP_NOTEXIST)] = "Target map doesn't exist",
1438 [ERRCODE_OFFSET(OBJCONF_MAP_VALUE)] = "Incorrect value type for map",
1439 [ERRCODE_OFFSET(OBJCONF_MAP_TYPE)] = "Incorrect map type",
1440 [ERRCODE_OFFSET(OBJCONF_MAP_KEYSIZE)] = "Incorrect map key size",
1441 [ERRCODE_OFFSET(OBJCONF_MAP_VALUESIZE)] = "Incorrect map value size",
1442 [ERRCODE_OFFSET(OBJCONF_MAP_NOEVT)] = "Event not found for map setting",
1443 [ERRCODE_OFFSET(OBJCONF_MAP_MAPSIZE)] = "Invalid map size for event setting",
1444 [ERRCODE_OFFSET(OBJCONF_MAP_EVTDIM)] = "Event dimension too large",
1445 [ERRCODE_OFFSET(OBJCONF_MAP_EVTINH)] = "Doesn't support inherit event",
1446 [ERRCODE_OFFSET(OBJCONF_MAP_EVTTYPE)] = "Wrong event type for map",
1447 [ERRCODE_OFFSET(OBJCONF_MAP_IDX2BIG)] = "Index too large",
1448 };
1449
1450 static int
1451 bpf_loader_strerror(int err, char *buf, size_t size)
1452 {
1453 char sbuf[STRERR_BUFSIZE];
1454 const char *msg;
1455
1456 if (!buf || !size)
1457 return -1;
1458
1459 err = err > 0 ? err : -err;
1460
1461 if (err >= __LIBBPF_ERRNO__START)
1462 return libbpf_strerror(err, buf, size);
1463
1464 if (err >= __BPF_LOADER_ERRNO__START && err < __BPF_LOADER_ERRNO__END) {
1465 msg = bpf_loader_strerror_table[ERRNO_OFFSET(err)];
1466 snprintf(buf, size, "%s", msg);
1467 buf[size - 1] = '\0';
1468 return 0;
1469 }
1470
1471 if (err >= __BPF_LOADER_ERRNO__END)
1472 snprintf(buf, size, "Unknown bpf loader error %d", err);
1473 else
1474 snprintf(buf, size, "%s",
1475 strerror_r(err, sbuf, sizeof(sbuf)));
1476
1477 buf[size - 1] = '\0';
1478 return -1;
1479 }
1480
1481 #define bpf__strerror_head(err, buf, size) \
1482 char sbuf[STRERR_BUFSIZE], *emsg;\
1483 if (!size)\
1484 return 0;\
1485 if (err < 0)\
1486 err = -err;\
1487 bpf_loader_strerror(err, sbuf, sizeof(sbuf));\
1488 emsg = sbuf;\
1489 switch (err) {\
1490 default:\
1491 scnprintf(buf, size, "%s", emsg);\
1492 break;
1493
1494 #define bpf__strerror_entry(val, fmt...)\
1495 case val: {\
1496 scnprintf(buf, size, fmt);\
1497 break;\
1498 }
1499
1500 #define bpf__strerror_end(buf, size)\
1501 }\
1502 buf[size - 1] = '\0';
1503
1504 int bpf__strerror_prepare_load(const char *filename, bool source,
1505 int err, char *buf, size_t size)
1506 {
1507 size_t n;
1508 int ret;
1509
1510 n = snprintf(buf, size, "Failed to load %s%s: ",
1511 filename, source ? " from source" : "");
1512 if (n >= size) {
1513 buf[size - 1] = '\0';
1514 return 0;
1515 }
1516 buf += n;
1517 size -= n;
1518
1519 ret = bpf_loader_strerror(err, buf, size);
1520 buf[size - 1] = '\0';
1521 return ret;
1522 }
1523
1524 int bpf__strerror_probe(struct bpf_object *obj __maybe_unused,
1525 int err, char *buf, size_t size)
1526 {
1527 bpf__strerror_head(err, buf, size);
1528 case BPF_LOADER_ERRNO__PROGCONF_TERM: {
1529 scnprintf(buf, size, "%s (add -v to see detail)", emsg);
1530 break;
1531 }
1532 bpf__strerror_entry(EEXIST, "Probe point exist. Try 'perf probe -d \"*\"' and set 'force=yes'");
1533 bpf__strerror_entry(EACCES, "You need to be root");
1534 bpf__strerror_entry(EPERM, "You need to be root, and /proc/sys/kernel/kptr_restrict should be 0");
1535 bpf__strerror_entry(ENOENT, "You need to check probing points in BPF file");
1536 bpf__strerror_end(buf, size);
1537 return 0;
1538 }
1539
1540 int bpf__strerror_load(struct bpf_object *obj,
1541 int err, char *buf, size_t size)
1542 {
1543 bpf__strerror_head(err, buf, size);
1544 case LIBBPF_ERRNO__KVER: {
1545 unsigned int obj_kver = bpf_object__get_kversion(obj);
1546 unsigned int real_kver;
1547
1548 if (fetch_kernel_version(&real_kver, NULL, 0)) {
1549 scnprintf(buf, size, "Unable to fetch kernel version");
1550 break;
1551 }
1552
1553 if (obj_kver != real_kver) {
1554 scnprintf(buf, size,
1555 "'version' ("KVER_FMT") doesn't match running kernel ("KVER_FMT")",
1556 KVER_PARAM(obj_kver),
1557 KVER_PARAM(real_kver));
1558 break;
1559 }
1560
1561 scnprintf(buf, size, "Failed to load program for unknown reason");
1562 break;
1563 }
1564 bpf__strerror_end(buf, size);
1565 return 0;
1566 }
1567
1568 int bpf__strerror_config_obj(struct bpf_object *obj __maybe_unused,
1569 struct parse_events_term *term __maybe_unused,
1570 struct perf_evlist *evlist __maybe_unused,
1571 int *error_pos __maybe_unused, int err,
1572 char *buf, size_t size)
1573 {
1574 bpf__strerror_head(err, buf, size);
1575 bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE,
1576 "Can't use this config term with this map type");
1577 bpf__strerror_end(buf, size);
1578 return 0;
1579 }
1580
1581 int bpf__strerror_apply_obj_config(int err, char *buf, size_t size)
1582 {
1583 bpf__strerror_head(err, buf, size);
1584 bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_EVTDIM,
1585 "Cannot set event to BPF map in multi-thread tracing");
1586 bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_EVTINH,
1587 "%s (Hint: use -i to turn off inherit)", emsg);
1588 bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_EVTTYPE,
1589 "Can only put raw, hardware and BPF output event into a BPF map");
1590 bpf__strerror_end(buf, size);
1591 return 0;
1592 }
Linux with added FPC-III support