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Merge tag 'for-linus-20160523' of git://git.infradead.org/linux-mtd
[deliverable/linux.git] / tools / perf / util / bpf-loader.c
1 /*
2 * bpf-loader.c
3 *
4 * Copyright (C) 2015 Wang Nan <wangnan0@huawei.com>
5 * Copyright (C) 2015 Huawei Inc.
6 */
7
8 #include <linux/bpf.h>
9 #include <bpf/libbpf.h>
10 #include <bpf/bpf.h>
11 #include <linux/err.h>
12 #include <linux/string.h>
13 #include "perf.h"
14 #include "debug.h"
15 #include "bpf-loader.h"
16 #include "bpf-prologue.h"
17 #include "llvm-utils.h"
18 #include "probe-event.h"
19 #include "probe-finder.h" // for MAX_PROBES
20 #include "parse-events.h"
21 #include "llvm-utils.h"
22
23 #define DEFINE_PRINT_FN(name, level) \
24 static int libbpf_##name(const char *fmt, ...) \
25 { \
26 va_list args; \
27 int ret; \
28 \
29 va_start(args, fmt); \
30 ret = veprintf(level, verbose, pr_fmt(fmt), args);\
31 va_end(args); \
32 return ret; \
33 }
34
35 DEFINE_PRINT_FN(warning, 1)
36 DEFINE_PRINT_FN(info, 1)
37 DEFINE_PRINT_FN(debug, 1)
38
39 struct bpf_prog_priv {
40 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 }
Linux kernel - Deliverables
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