1
2
3
4
5
6
7
8
9#include <linux/bpf.h>
10#include <bpf/libbpf.h>
11#include <bpf/bpf.h>
12#include <linux/err.h>
13#include <linux/kernel.h>
14#include <linux/string.h>
15#include <errno.h>
16#include "perf.h"
17#include "debug.h"
18#include "evlist.h"
19#include "bpf-loader.h"
20#include "bpf-prologue.h"
21#include "probe-event.h"
22#include "probe-finder.h"
23#include "parse-events.h"
24#include "strfilter.h"
25#include "llvm-utils.h"
26#include "c++/clang-c.h"
27
28static int libbpf_perf_print(enum libbpf_print_level level __attribute__((unused)),
29 const char *fmt, va_list args)
30{
31 return veprintf(1, verbose, pr_fmt(fmt), args);
32}
33
34struct bpf_prog_priv {
35 bool is_tp;
36 char *sys_name;
37 char *evt_name;
38 struct perf_probe_event pev;
39 bool need_prologue;
40 struct bpf_insn *insns_buf;
41 int nr_types;
42 int *type_mapping;
43};
44
45static bool libbpf_initialized;
46
47struct bpf_object *
48bpf__prepare_load_buffer(void *obj_buf, size_t obj_buf_sz, const char *name)
49{
50 struct bpf_object *obj;
51
52 if (!libbpf_initialized) {
53 libbpf_set_print(libbpf_perf_print);
54 libbpf_initialized = true;
55 }
56
57 obj = bpf_object__open_buffer(obj_buf, obj_buf_sz, name);
58 if (IS_ERR_OR_NULL(obj)) {
59 pr_debug("bpf: failed to load buffer\n");
60 return ERR_PTR(-EINVAL);
61 }
62
63 return obj;
64}
65
66struct bpf_object *bpf__prepare_load(const char *filename, bool source)
67{
68 struct bpf_object *obj;
69
70 if (!libbpf_initialized) {
71 libbpf_set_print(libbpf_perf_print);
72 libbpf_initialized = true;
73 }
74
75 if (source) {
76 int err;
77 void *obj_buf;
78 size_t obj_buf_sz;
79
80 perf_clang__init();
81 err = perf_clang__compile_bpf(filename, &obj_buf, &obj_buf_sz);
82 perf_clang__cleanup();
83 if (err) {
84 pr_debug("bpf: builtin compilation failed: %d, try external compiler\n", err);
85 err = llvm__compile_bpf(filename, &obj_buf, &obj_buf_sz);
86 if (err)
87 return ERR_PTR(-BPF_LOADER_ERRNO__COMPILE);
88 } else
89 pr_debug("bpf: successful builtin compilation\n");
90 obj = bpf_object__open_buffer(obj_buf, obj_buf_sz, filename);
91
92 if (!IS_ERR_OR_NULL(obj) && llvm_param.dump_obj)
93 llvm__dump_obj(filename, obj_buf, obj_buf_sz);
94
95 free(obj_buf);
96 } else
97 obj = bpf_object__open(filename);
98
99 if (IS_ERR_OR_NULL(obj)) {
100 pr_debug("bpf: failed to load %s\n", filename);
101 return obj;
102 }
103
104 return obj;
105}
106
107void bpf__clear(void)
108{
109 struct bpf_object *obj, *tmp;
110
111 bpf_object__for_each_safe(obj, tmp) {
112 bpf__unprobe(obj);
113 bpf_object__close(obj);
114 }
115}
116
117static void
118clear_prog_priv(struct bpf_program *prog __maybe_unused,
119 void *_priv)
120{
121 struct bpf_prog_priv *priv = _priv;
122
123 cleanup_perf_probe_events(&priv->pev, 1);
124 zfree(&priv->insns_buf);
125 zfree(&priv->type_mapping);
126 zfree(&priv->sys_name);
127 zfree(&priv->evt_name);
128 free(priv);
129}
130
131static int
132prog_config__exec(const char *value, struct perf_probe_event *pev)
133{
134 pev->uprobes = true;
135 pev->target = strdup(value);
136 if (!pev->target)
137 return -ENOMEM;
138 return 0;
139}
140
141static int
142prog_config__module(const char *value, struct perf_probe_event *pev)
143{
144 pev->uprobes = false;
145 pev->target = strdup(value);
146 if (!pev->target)
147 return -ENOMEM;
148 return 0;
149}
150
151static int
152prog_config__bool(const char *value, bool *pbool, bool invert)
153{
154 int err;
155 bool bool_value;
156
157 if (!pbool)
158 return -EINVAL;
159
160 err = strtobool(value, &bool_value);
161 if (err)
162 return err;
163
164 *pbool = invert ? !bool_value : bool_value;
165 return 0;
166}
167
168static int
169prog_config__inlines(const char *value,
170 struct perf_probe_event *pev __maybe_unused)
171{
172 return prog_config__bool(value, &probe_conf.no_inlines, true);
173}
174
175static int
176prog_config__force(const char *value,
177 struct perf_probe_event *pev __maybe_unused)
178{
179 return prog_config__bool(value, &probe_conf.force_add, false);
180}
181
182static struct {
183 const char *key;
184 const char *usage;
185 const char *desc;
186 int (*func)(const char *, struct perf_probe_event *);
187} bpf_prog_config_terms[] = {
188 {
189 .key = "exec",
190 .usage = "exec=<full path of file>",
191 .desc = "Set uprobe target",
192 .func = prog_config__exec,
193 },
194 {
195 .key = "module",
196 .usage = "module=<module name> ",
197 .desc = "Set kprobe module",
198 .func = prog_config__module,
199 },
200 {
201 .key = "inlines",
202 .usage = "inlines=[yes|no] ",
203 .desc = "Probe at inline symbol",
204 .func = prog_config__inlines,
205 },
206 {
207 .key = "force",
208 .usage = "force=[yes|no] ",
209 .desc = "Forcibly add events with existing name",
210 .func = prog_config__force,
211 },
212};
213
214static int
215do_prog_config(const char *key, const char *value,
216 struct perf_probe_event *pev)
217{
218 unsigned int i;
219
220 pr_debug("config bpf program: %s=%s\n", key, value);
221 for (i = 0; i < ARRAY_SIZE(bpf_prog_config_terms); i++)
222 if (strcmp(key, bpf_prog_config_terms[i].key) == 0)
223 return bpf_prog_config_terms[i].func(value, pev);
224
225 pr_debug("BPF: ERROR: invalid program config option: %s=%s\n",
226 key, value);
227
228 pr_debug("\nHint: Valid options are:\n");
229 for (i = 0; i < ARRAY_SIZE(bpf_prog_config_terms); i++)
230 pr_debug("\t%s:\t%s\n", bpf_prog_config_terms[i].usage,
231 bpf_prog_config_terms[i].desc);
232 pr_debug("\n");
233
234 return -BPF_LOADER_ERRNO__PROGCONF_TERM;
235}
236
237static const char *
238parse_prog_config_kvpair(const char *config_str, struct perf_probe_event *pev)
239{
240 char *text = strdup(config_str);
241 char *sep, *line;
242 const char *main_str = NULL;
243 int err = 0;
244
245 if (!text) {
246 pr_debug("Not enough memory: dup config_str failed\n");
247 return ERR_PTR(-ENOMEM);
248 }
249
250 line = text;
251 while ((sep = strchr(line, ';'))) {
252 char *equ;
253
254 *sep = '\0';
255 equ = strchr(line, '=');
256 if (!equ) {
257 pr_warning("WARNING: invalid config in BPF object: %s\n",
258 line);
259 pr_warning("\tShould be 'key=value'.\n");
260 goto nextline;
261 }
262 *equ = '\0';
263
264 err = do_prog_config(line, equ + 1, pev);
265 if (err)
266 break;
267nextline:
268 line = sep + 1;
269 }
270
271 if (!err)
272 main_str = config_str + (line - text);
273 free(text);
274
275 return err ? ERR_PTR(err) : main_str;
276}
277
278static int
279parse_prog_config(const char *config_str, const char **p_main_str,
280 bool *is_tp, struct perf_probe_event *pev)
281{
282 int err;
283 const char *main_str = parse_prog_config_kvpair(config_str, pev);
284
285 if (IS_ERR(main_str))
286 return PTR_ERR(main_str);
287
288 *p_main_str = main_str;
289 if (!strchr(main_str, '=')) {
290
291 const char *s = strchr(main_str, ':');
292
293 if (!s) {
294 pr_debug("bpf: '%s' is not a valid tracepoint\n",
295 config_str);
296 return -BPF_LOADER_ERRNO__CONFIG;
297 }
298
299 *is_tp = true;
300 return 0;
301 }
302
303 *is_tp = false;
304 err = parse_perf_probe_command(main_str, pev);
305 if (err < 0) {
306 pr_debug("bpf: '%s' is not a valid config string\n",
307 config_str);
308
309 return -BPF_LOADER_ERRNO__CONFIG;
310 }
311 return 0;
312}
313
314static int
315config_bpf_program(struct bpf_program *prog)
316{
317 struct perf_probe_event *pev = NULL;
318 struct bpf_prog_priv *priv = NULL;
319 const char *config_str, *main_str;
320 bool is_tp = false;
321 int err;
322
323
324 probe_conf.no_inlines = false;
325 probe_conf.force_add = false;
326
327 config_str = bpf_program__title(prog, false);
328 if (IS_ERR(config_str)) {
329 pr_debug("bpf: unable to get title for program\n");
330 return PTR_ERR(config_str);
331 }
332
333 priv = calloc(sizeof(*priv), 1);
334 if (!priv) {
335 pr_debug("bpf: failed to alloc priv\n");
336 return -ENOMEM;
337 }
338 pev = &priv->pev;
339
340 pr_debug("bpf: config program '%s'\n", config_str);
341 err = parse_prog_config(config_str, &main_str, &is_tp, pev);
342 if (err)
343 goto errout;
344
345 if (is_tp) {
346 char *s = strchr(main_str, ':');
347
348 priv->is_tp = true;
349 priv->sys_name = strndup(main_str, s - main_str);
350 priv->evt_name = strdup(s + 1);
351 goto set_priv;
352 }
353
354 if (pev->group && strcmp(pev->group, PERF_BPF_PROBE_GROUP)) {
355 pr_debug("bpf: '%s': group for event is set and not '%s'.\n",
356 config_str, PERF_BPF_PROBE_GROUP);
357 err = -BPF_LOADER_ERRNO__GROUP;
358 goto errout;
359 } else if (!pev->group)
360 pev->group = strdup(PERF_BPF_PROBE_GROUP);
361
362 if (!pev->group) {
363 pr_debug("bpf: strdup failed\n");
364 err = -ENOMEM;
365 goto errout;
366 }
367
368 if (!pev->event) {
369 pr_debug("bpf: '%s': event name is missing. Section name should be 'key=value'\n",
370 config_str);
371 err = -BPF_LOADER_ERRNO__EVENTNAME;
372 goto errout;
373 }
374 pr_debug("bpf: config '%s' is ok\n", config_str);
375
376set_priv:
377 err = bpf_program__set_priv(prog, priv, clear_prog_priv);
378 if (err) {
379 pr_debug("Failed to set priv for program '%s'\n", config_str);
380 goto errout;
381 }
382
383 return 0;
384
385errout:
386 if (pev)
387 clear_perf_probe_event(pev);
388 free(priv);
389 return err;
390}
391
392static int bpf__prepare_probe(void)
393{
394 static int err = 0;
395 static bool initialized = false;
396
397
398
399
400
401
402 if (initialized)
403 return err;
404
405 initialized = true;
406 err = init_probe_symbol_maps(false);
407 if (err < 0)
408 pr_debug("Failed to init_probe_symbol_maps\n");
409 probe_conf.max_probes = MAX_PROBES;
410 return err;
411}
412
413static int
414preproc_gen_prologue(struct bpf_program *prog, int n,
415 struct bpf_insn *orig_insns, int orig_insns_cnt,
416 struct bpf_prog_prep_result *res)
417{
418 struct bpf_prog_priv *priv = bpf_program__priv(prog);
419 struct probe_trace_event *tev;
420 struct perf_probe_event *pev;
421 struct bpf_insn *buf;
422 size_t prologue_cnt = 0;
423 int i, err;
424
425 if (IS_ERR(priv) || !priv || priv->is_tp)
426 goto errout;
427
428 pev = &priv->pev;
429
430 if (n < 0 || n >= priv->nr_types)
431 goto errout;
432
433
434 for (i = 0; i < pev->ntevs; i++) {
435 if (priv->type_mapping[i] == n)
436 break;
437 }
438
439 if (i >= pev->ntevs) {
440 pr_debug("Internal error: prologue type %d not found\n", n);
441 return -BPF_LOADER_ERRNO__PROLOGUE;
442 }
443
444 tev = &pev->tevs[i];
445
446 buf = priv->insns_buf;
447 err = bpf__gen_prologue(tev->args, tev->nargs,
448 buf, &prologue_cnt,
449 BPF_MAXINSNS - orig_insns_cnt);
450 if (err) {
451 const char *title;
452
453 title = bpf_program__title(prog, false);
454 if (!title)
455 title = "[unknown]";
456
457 pr_debug("Failed to generate prologue for program %s\n",
458 title);
459 return err;
460 }
461
462 memcpy(&buf[prologue_cnt], orig_insns,
463 sizeof(struct bpf_insn) * orig_insns_cnt);
464
465 res->new_insn_ptr = buf;
466 res->new_insn_cnt = prologue_cnt + orig_insns_cnt;
467 res->pfd = NULL;
468 return 0;
469
470errout:
471 pr_debug("Internal error in preproc_gen_prologue\n");
472 return -BPF_LOADER_ERRNO__PROLOGUE;
473}
474
475
476
477
478
479static int compare_tev_args(const void *ptev1, const void *ptev2)
480{
481 int i, ret;
482 const struct probe_trace_event *tev1 =
483 *(const struct probe_trace_event **)ptev1;
484 const struct probe_trace_event *tev2 =
485 *(const struct probe_trace_event **)ptev2;
486
487 ret = tev2->nargs - tev1->nargs;
488 if (ret)
489 return ret;
490
491 for (i = 0; i < tev1->nargs; i++) {
492 struct probe_trace_arg *arg1, *arg2;
493 struct probe_trace_arg_ref *ref1, *ref2;
494
495 arg1 = &tev1->args[i];
496 arg2 = &tev2->args[i];
497
498 ret = strcmp(arg1->value, arg2->value);
499 if (ret)
500 return ret;
501
502 ref1 = arg1->ref;
503 ref2 = arg2->ref;
504
505 while (ref1 && ref2) {
506 ret = ref2->offset - ref1->offset;
507 if (ret)
508 return ret;
509
510 ref1 = ref1->next;
511 ref2 = ref2->next;
512 }
513
514 if (ref1 || ref2)
515 return ref2 ? 1 : -1;
516 }
517
518 return 0;
519}
520
521
522
523
524
525
526static int map_prologue(struct perf_probe_event *pev, int *mapping,
527 int *nr_types)
528{
529 int i, type = 0;
530 struct probe_trace_event **ptevs;
531
532 size_t array_sz = sizeof(*ptevs) * pev->ntevs;
533
534 ptevs = malloc(array_sz);
535 if (!ptevs) {
536 pr_debug("Not enough memory: alloc ptevs failed\n");
537 return -ENOMEM;
538 }
539
540 pr_debug("In map_prologue, ntevs=%d\n", pev->ntevs);
541 for (i = 0; i < pev->ntevs; i++)
542 ptevs[i] = &pev->tevs[i];
543
544 qsort(ptevs, pev->ntevs, sizeof(*ptevs),
545 compare_tev_args);
546
547 for (i = 0; i < pev->ntevs; i++) {
548 int n;
549
550 n = ptevs[i] - pev->tevs;
551 if (i == 0) {
552 mapping[n] = type;
553 pr_debug("mapping[%d]=%d\n", n, type);
554 continue;
555 }
556
557 if (compare_tev_args(ptevs + i, ptevs + i - 1) == 0)
558 mapping[n] = type;
559 else
560 mapping[n] = ++type;
561
562 pr_debug("mapping[%d]=%d\n", n, mapping[n]);
563 }
564 free(ptevs);
565 *nr_types = type + 1;
566
567 return 0;
568}
569
570static int hook_load_preprocessor(struct bpf_program *prog)
571{
572 struct bpf_prog_priv *priv = bpf_program__priv(prog);
573 struct perf_probe_event *pev;
574 bool need_prologue = false;
575 int err, i;
576
577 if (IS_ERR(priv) || !priv) {
578 pr_debug("Internal error when hook preprocessor\n");
579 return -BPF_LOADER_ERRNO__INTERNAL;
580 }
581
582 if (priv->is_tp) {
583 priv->need_prologue = false;
584 return 0;
585 }
586
587 pev = &priv->pev;
588 for (i = 0; i < pev->ntevs; i++) {
589 struct probe_trace_event *tev = &pev->tevs[i];
590
591 if (tev->nargs > 0) {
592 need_prologue = true;
593 break;
594 }
595 }
596
597
598
599
600
601 if (!need_prologue) {
602 priv->need_prologue = false;
603 return 0;
604 }
605
606 priv->need_prologue = true;
607 priv->insns_buf = malloc(sizeof(struct bpf_insn) * BPF_MAXINSNS);
608 if (!priv->insns_buf) {
609 pr_debug("Not enough memory: alloc insns_buf failed\n");
610 return -ENOMEM;
611 }
612
613 priv->type_mapping = malloc(sizeof(int) * pev->ntevs);
614 if (!priv->type_mapping) {
615 pr_debug("Not enough memory: alloc type_mapping failed\n");
616 return -ENOMEM;
617 }
618 memset(priv->type_mapping, -1,
619 sizeof(int) * pev->ntevs);
620
621 err = map_prologue(pev, priv->type_mapping, &priv->nr_types);
622 if (err)
623 return err;
624
625 err = bpf_program__set_prep(prog, priv->nr_types,
626 preproc_gen_prologue);
627 return err;
628}
629
630int bpf__probe(struct bpf_object *obj)
631{
632 int err = 0;
633 struct bpf_program *prog;
634 struct bpf_prog_priv *priv;
635 struct perf_probe_event *pev;
636
637 err = bpf__prepare_probe();
638 if (err) {
639 pr_debug("bpf__prepare_probe failed\n");
640 return err;
641 }
642
643 bpf_object__for_each_program(prog, obj) {
644 err = config_bpf_program(prog);
645 if (err)
646 goto out;
647
648 priv = bpf_program__priv(prog);
649 if (IS_ERR(priv) || !priv) {
650 err = PTR_ERR(priv);
651 goto out;
652 }
653
654 if (priv->is_tp) {
655 bpf_program__set_tracepoint(prog);
656 continue;
657 }
658
659 bpf_program__set_kprobe(prog);
660 pev = &priv->pev;
661
662 err = convert_perf_probe_events(pev, 1);
663 if (err < 0) {
664 pr_debug("bpf_probe: failed to convert perf probe events\n");
665 goto out;
666 }
667
668 err = apply_perf_probe_events(pev, 1);
669 if (err < 0) {
670 pr_debug("bpf_probe: failed to apply perf probe events\n");
671 goto out;
672 }
673
674
675
676
677
678
679
680
681
682 err = hook_load_preprocessor(prog);
683 if (err)
684 goto out;
685 }
686out:
687 return err < 0 ? err : 0;
688}
689
690#define EVENTS_WRITE_BUFSIZE 4096
691int bpf__unprobe(struct bpf_object *obj)
692{
693 int err, ret = 0;
694 struct bpf_program *prog;
695
696 bpf_object__for_each_program(prog, obj) {
697 struct bpf_prog_priv *priv = bpf_program__priv(prog);
698 int i;
699
700 if (IS_ERR(priv) || !priv || priv->is_tp)
701 continue;
702
703 for (i = 0; i < priv->pev.ntevs; i++) {
704 struct probe_trace_event *tev = &priv->pev.tevs[i];
705 char name_buf[EVENTS_WRITE_BUFSIZE];
706 struct strfilter *delfilter;
707
708 snprintf(name_buf, EVENTS_WRITE_BUFSIZE,
709 "%s:%s", tev->group, tev->event);
710 name_buf[EVENTS_WRITE_BUFSIZE - 1] = '\0';
711
712 delfilter = strfilter__new(name_buf, NULL);
713 if (!delfilter) {
714 pr_debug("Failed to create filter for unprobing\n");
715 ret = -ENOMEM;
716 continue;
717 }
718
719 err = del_perf_probe_events(delfilter);
720 strfilter__delete(delfilter);
721 if (err) {
722 pr_debug("Failed to delete %s\n", name_buf);
723 ret = err;
724 continue;
725 }
726 }
727 }
728 return ret;
729}
730
731int bpf__load(struct bpf_object *obj)
732{
733 int err;
734
735 err = bpf_object__load(obj);
736 if (err) {
737 char bf[128];
738 libbpf_strerror(err, bf, sizeof(bf));
739 pr_debug("bpf: load objects failed: err=%d: (%s)\n", err, bf);
740 return err;
741 }
742 return 0;
743}
744
745int bpf__foreach_event(struct bpf_object *obj,
746 bpf_prog_iter_callback_t func,
747 void *arg)
748{
749 struct bpf_program *prog;
750 int err;
751
752 bpf_object__for_each_program(prog, obj) {
753 struct bpf_prog_priv *priv = bpf_program__priv(prog);
754 struct probe_trace_event *tev;
755 struct perf_probe_event *pev;
756 int i, fd;
757
758 if (IS_ERR(priv) || !priv) {
759 pr_debug("bpf: failed to get private field\n");
760 return -BPF_LOADER_ERRNO__INTERNAL;
761 }
762
763 if (priv->is_tp) {
764 fd = bpf_program__fd(prog);
765 err = (*func)(priv->sys_name, priv->evt_name, fd, arg);
766 if (err) {
767 pr_debug("bpf: tracepoint call back failed, stop iterate\n");
768 return err;
769 }
770 continue;
771 }
772
773 pev = &priv->pev;
774 for (i = 0; i < pev->ntevs; i++) {
775 tev = &pev->tevs[i];
776
777 if (priv->need_prologue) {
778 int type = priv->type_mapping[i];
779
780 fd = bpf_program__nth_fd(prog, type);
781 } else {
782 fd = bpf_program__fd(prog);
783 }
784
785 if (fd < 0) {
786 pr_debug("bpf: failed to get file descriptor\n");
787 return fd;
788 }
789
790 err = (*func)(tev->group, tev->event, fd, arg);
791 if (err) {
792 pr_debug("bpf: call back failed, stop iterate\n");
793 return err;
794 }
795 }
796 }
797 return 0;
798}
799
800enum bpf_map_op_type {
801 BPF_MAP_OP_SET_VALUE,
802 BPF_MAP_OP_SET_EVSEL,
803};
804
805enum bpf_map_key_type {
806 BPF_MAP_KEY_ALL,
807 BPF_MAP_KEY_RANGES,
808};
809
810struct bpf_map_op {
811 struct list_head list;
812 enum bpf_map_op_type op_type;
813 enum bpf_map_key_type key_type;
814 union {
815 struct parse_events_array array;
816 } k;
817 union {
818 u64 value;
819 struct perf_evsel *evsel;
820 } v;
821};
822
823struct bpf_map_priv {
824 struct list_head ops_list;
825};
826
827static void
828bpf_map_op__delete(struct bpf_map_op *op)
829{
830 if (!list_empty(&op->list))
831 list_del(&op->list);
832 if (op->key_type == BPF_MAP_KEY_RANGES)
833 parse_events__clear_array(&op->k.array);
834 free(op);
835}
836
837static void
838bpf_map_priv__purge(struct bpf_map_priv *priv)
839{
840 struct bpf_map_op *pos, *n;
841
842 list_for_each_entry_safe(pos, n, &priv->ops_list, list) {
843 list_del_init(&pos->list);
844 bpf_map_op__delete(pos);
845 }
846}
847
848static void
849bpf_map_priv__clear(struct bpf_map *map __maybe_unused,
850 void *_priv)
851{
852 struct bpf_map_priv *priv = _priv;
853
854 bpf_map_priv__purge(priv);
855 free(priv);
856}
857
858static int
859bpf_map_op_setkey(struct bpf_map_op *op, struct parse_events_term *term)
860{
861 op->key_type = BPF_MAP_KEY_ALL;
862 if (!term)
863 return 0;
864
865 if (term->array.nr_ranges) {
866 size_t memsz = term->array.nr_ranges *
867 sizeof(op->k.array.ranges[0]);
868
869 op->k.array.ranges = memdup(term->array.ranges, memsz);
870 if (!op->k.array.ranges) {
871 pr_debug("Not enough memory to alloc indices for map\n");
872 return -ENOMEM;
873 }
874 op->key_type = BPF_MAP_KEY_RANGES;
875 op->k.array.nr_ranges = term->array.nr_ranges;
876 }
877 return 0;
878}
879
880static struct bpf_map_op *
881bpf_map_op__new(struct parse_events_term *term)
882{
883 struct bpf_map_op *op;
884 int err;
885
886 op = zalloc(sizeof(*op));
887 if (!op) {
888 pr_debug("Failed to alloc bpf_map_op\n");
889 return ERR_PTR(-ENOMEM);
890 }
891 INIT_LIST_HEAD(&op->list);
892
893 err = bpf_map_op_setkey(op, term);
894 if (err) {
895 free(op);
896 return ERR_PTR(err);
897 }
898 return op;
899}
900
901static struct bpf_map_op *
902bpf_map_op__clone(struct bpf_map_op *op)
903{
904 struct bpf_map_op *newop;
905
906 newop = memdup(op, sizeof(*op));
907 if (!newop) {
908 pr_debug("Failed to alloc bpf_map_op\n");
909 return NULL;
910 }
911
912 INIT_LIST_HEAD(&newop->list);
913 if (op->key_type == BPF_MAP_KEY_RANGES) {
914 size_t memsz = op->k.array.nr_ranges *
915 sizeof(op->k.array.ranges[0]);
916
917 newop->k.array.ranges = memdup(op->k.array.ranges, memsz);
918 if (!newop->k.array.ranges) {
919 pr_debug("Failed to alloc indices for map\n");
920 free(newop);
921 return NULL;
922 }
923 }
924
925 return newop;
926}
927
928static struct bpf_map_priv *
929bpf_map_priv__clone(struct bpf_map_priv *priv)
930{
931 struct bpf_map_priv *newpriv;
932 struct bpf_map_op *pos, *newop;
933
934 newpriv = zalloc(sizeof(*newpriv));
935 if (!newpriv) {
936 pr_debug("Not enough memory to alloc map private\n");
937 return NULL;
938 }
939 INIT_LIST_HEAD(&newpriv->ops_list);
940
941 list_for_each_entry(pos, &priv->ops_list, list) {
942 newop = bpf_map_op__clone(pos);
943 if (!newop) {
944 bpf_map_priv__purge(newpriv);
945 return NULL;
946 }
947 list_add_tail(&newop->list, &newpriv->ops_list);
948 }
949
950 return newpriv;
951}
952
953static int
954bpf_map__add_op(struct bpf_map *map, struct bpf_map_op *op)
955{
956 const char *map_name = bpf_map__name(map);
957 struct bpf_map_priv *priv = bpf_map__priv(map);
958
959 if (IS_ERR(priv)) {
960 pr_debug("Failed to get private from map %s\n", map_name);
961 return PTR_ERR(priv);
962 }
963
964 if (!priv) {
965 priv = zalloc(sizeof(*priv));
966 if (!priv) {
967 pr_debug("Not enough memory to alloc map private\n");
968 return -ENOMEM;
969 }
970 INIT_LIST_HEAD(&priv->ops_list);
971
972 if (bpf_map__set_priv(map, priv, bpf_map_priv__clear)) {
973 free(priv);
974 return -BPF_LOADER_ERRNO__INTERNAL;
975 }
976 }
977
978 list_add_tail(&op->list, &priv->ops_list);
979 return 0;
980}
981
982static struct bpf_map_op *
983bpf_map__add_newop(struct bpf_map *map, struct parse_events_term *term)
984{
985 struct bpf_map_op *op;
986 int err;
987
988 op = bpf_map_op__new(term);
989 if (IS_ERR(op))
990 return op;
991
992 err = bpf_map__add_op(map, op);
993 if (err) {
994 bpf_map_op__delete(op);
995 return ERR_PTR(err);
996 }
997 return op;
998}
999
1000static int
1001__bpf_map__config_value(struct bpf_map *map,
1002 struct parse_events_term *term)
1003{
1004 struct bpf_map_op *op;
1005 const char *map_name = bpf_map__name(map);
1006 const struct bpf_map_def *def = bpf_map__def(map);
1007
1008 if (IS_ERR(def)) {
1009 pr_debug("Unable to get map definition from '%s'\n",
1010 map_name);
1011 return -BPF_LOADER_ERRNO__INTERNAL;
1012 }
1013
1014 if (def->type != BPF_MAP_TYPE_ARRAY) {
1015 pr_debug("Map %s type is not BPF_MAP_TYPE_ARRAY\n",
1016 map_name);
1017 return -BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE;
1018 }
1019 if (def->key_size < sizeof(unsigned int)) {
1020 pr_debug("Map %s has incorrect key size\n", map_name);
1021 return -BPF_LOADER_ERRNO__OBJCONF_MAP_KEYSIZE;
1022 }
1023 switch (def->value_size) {
1024 case 1:
1025 case 2:
1026 case 4:
1027 case 8:
1028 break;
1029 default:
1030 pr_debug("Map %s has incorrect value size\n", map_name);
1031 return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUESIZE;
1032 }
1033
1034 op = bpf_map__add_newop(map, term);
1035 if (IS_ERR(op))
1036 return PTR_ERR(op);
1037 op->op_type = BPF_MAP_OP_SET_VALUE;
1038 op->v.value = term->val.num;
1039 return 0;
1040}
1041
1042static int
1043bpf_map__config_value(struct bpf_map *map,
1044 struct parse_events_term *term,
1045 struct perf_evlist *evlist __maybe_unused)
1046{
1047 if (!term->err_val) {
1048 pr_debug("Config value not set\n");
1049 return -BPF_LOADER_ERRNO__OBJCONF_CONF;
1050 }
1051
1052 if (term->type_val != PARSE_EVENTS__TERM_TYPE_NUM) {
1053 pr_debug("ERROR: wrong value type for 'value'\n");
1054 return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUE;
1055 }
1056
1057 return __bpf_map__config_value(map, term);
1058}
1059
1060static int
1061__bpf_map__config_event(struct bpf_map *map,
1062 struct parse_events_term *term,
1063 struct perf_evlist *evlist)
1064{
1065 struct perf_evsel *evsel;
1066 const struct bpf_map_def *def;
1067 struct bpf_map_op *op;
1068 const char *map_name = bpf_map__name(map);
1069
1070 evsel = perf_evlist__find_evsel_by_str(evlist, term->val.str);
1071 if (!evsel) {
1072 pr_debug("Event (for '%s') '%s' doesn't exist\n",
1073 map_name, term->val.str);
1074 return -BPF_LOADER_ERRNO__OBJCONF_MAP_NOEVT;
1075 }
1076
1077 def = bpf_map__def(map);
1078 if (IS_ERR(def)) {
1079 pr_debug("Unable to get map definition from '%s'\n",
1080 map_name);
1081 return PTR_ERR(def);
1082 }
1083
1084
1085
1086
1087
1088 if (def->type != BPF_MAP_TYPE_PERF_EVENT_ARRAY) {
1089 pr_debug("Map %s type is not BPF_MAP_TYPE_PERF_EVENT_ARRAY\n",
1090 map_name);
1091 return -BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE;
1092 }
1093
1094 op = bpf_map__add_newop(map, term);
1095 if (IS_ERR(op))
1096 return PTR_ERR(op);
1097 op->op_type = BPF_MAP_OP_SET_EVSEL;
1098 op->v.evsel = evsel;
1099 return 0;
1100}
1101
1102static int
1103bpf_map__config_event(struct bpf_map *map,
1104 struct parse_events_term *term,
1105 struct perf_evlist *evlist)
1106{
1107 if (!term->err_val) {
1108 pr_debug("Config value not set\n");
1109 return -BPF_LOADER_ERRNO__OBJCONF_CONF;
1110 }
1111
1112 if (term->type_val != PARSE_EVENTS__TERM_TYPE_STR) {
1113 pr_debug("ERROR: wrong value type for 'event'\n");
1114 return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUE;
1115 }
1116
1117 return __bpf_map__config_event(map, term, evlist);
1118}
1119
1120struct bpf_obj_config__map_func {
1121 const char *config_opt;
1122 int (*config_func)(struct bpf_map *, struct parse_events_term *,
1123 struct perf_evlist *);
1124};
1125
1126struct bpf_obj_config__map_func bpf_obj_config__map_funcs[] = {
1127 {"value", bpf_map__config_value},
1128 {"event", bpf_map__config_event},
1129};
1130
1131static int
1132config_map_indices_range_check(struct parse_events_term *term,
1133 struct bpf_map *map,
1134 const char *map_name)
1135{
1136 struct parse_events_array *array = &term->array;
1137 const struct bpf_map_def *def;
1138 unsigned int i;
1139
1140 if (!array->nr_ranges)
1141 return 0;
1142 if (!array->ranges) {
1143 pr_debug("ERROR: map %s: array->nr_ranges is %d but range array is NULL\n",
1144 map_name, (int)array->nr_ranges);
1145 return -BPF_LOADER_ERRNO__INTERNAL;
1146 }
1147
1148 def = bpf_map__def(map);
1149 if (IS_ERR(def)) {
1150 pr_debug("ERROR: Unable to get map definition from '%s'\n",
1151 map_name);
1152 return -BPF_LOADER_ERRNO__INTERNAL;
1153 }
1154
1155 for (i = 0; i < array->nr_ranges; i++) {
1156 unsigned int start = array->ranges[i].start;
1157 size_t length = array->ranges[i].length;
1158 unsigned int idx = start + length - 1;
1159
1160 if (idx >= def->max_entries) {
1161 pr_debug("ERROR: index %d too large\n", idx);
1162 return -BPF_LOADER_ERRNO__OBJCONF_MAP_IDX2BIG;
1163 }
1164 }
1165 return 0;
1166}
1167
1168static int
1169bpf__obj_config_map(struct bpf_object *obj,
1170 struct parse_events_term *term,
1171 struct perf_evlist *evlist,
1172 int *key_scan_pos)
1173{
1174
1175 char *map_name = strdup(term->config + sizeof("map:") - 1);
1176 struct bpf_map *map;
1177 int err = -BPF_LOADER_ERRNO__OBJCONF_OPT;
1178 char *map_opt;
1179 size_t i;
1180
1181 if (!map_name)
1182 return -ENOMEM;
1183
1184 map_opt = strchr(map_name, '.');
1185 if (!map_opt) {
1186 pr_debug("ERROR: Invalid map config: %s\n", map_name);
1187 goto out;
1188 }
1189
1190 *map_opt++ = '\0';
1191 if (*map_opt == '\0') {
1192 pr_debug("ERROR: Invalid map option: %s\n", term->config);
1193 goto out;
1194 }
1195
1196 map = bpf_object__find_map_by_name(obj, map_name);
1197 if (!map) {
1198 pr_debug("ERROR: Map %s doesn't exist\n", map_name);
1199 err = -BPF_LOADER_ERRNO__OBJCONF_MAP_NOTEXIST;
1200 goto out;
1201 }
1202
1203 *key_scan_pos += strlen(map_opt);
1204 err = config_map_indices_range_check(term, map, map_name);
1205 if (err)
1206 goto out;
1207 *key_scan_pos -= strlen(map_opt);
1208
1209 for (i = 0; i < ARRAY_SIZE(bpf_obj_config__map_funcs); i++) {
1210 struct bpf_obj_config__map_func *func =
1211 &bpf_obj_config__map_funcs[i];
1212
1213 if (strcmp(map_opt, func->config_opt) == 0) {
1214 err = func->config_func(map, term, evlist);
1215 goto out;
1216 }
1217 }
1218
1219 pr_debug("ERROR: Invalid map config option '%s'\n", map_opt);
1220 err = -BPF_LOADER_ERRNO__OBJCONF_MAP_OPT;
1221out:
1222 free(map_name);
1223 if (!err)
1224 key_scan_pos += strlen(map_opt);
1225 return err;
1226}
1227
1228int bpf__config_obj(struct bpf_object *obj,
1229 struct parse_events_term *term,
1230 struct perf_evlist *evlist,
1231 int *error_pos)
1232{
1233 int key_scan_pos = 0;
1234 int err;
1235
1236 if (!obj || !term || !term->config)
1237 return -EINVAL;
1238
1239 if (strstarts(term->config, "map:")) {
1240 key_scan_pos = sizeof("map:") - 1;
1241 err = bpf__obj_config_map(obj, term, evlist, &key_scan_pos);
1242 goto out;
1243 }
1244 err = -BPF_LOADER_ERRNO__OBJCONF_OPT;
1245out:
1246 if (error_pos)
1247 *error_pos = key_scan_pos;
1248 return err;
1249
1250}
1251
1252typedef int (*map_config_func_t)(const char *name, int map_fd,
1253 const struct bpf_map_def *pdef,
1254 struct bpf_map_op *op,
1255 void *pkey, void *arg);
1256
1257static int
1258foreach_key_array_all(map_config_func_t func,
1259 void *arg, const char *name,
1260 int map_fd, const struct bpf_map_def *pdef,
1261 struct bpf_map_op *op)
1262{
1263 unsigned int i;
1264 int err;
1265
1266 for (i = 0; i < pdef->max_entries; i++) {
1267 err = func(name, map_fd, pdef, op, &i, arg);
1268 if (err) {
1269 pr_debug("ERROR: failed to insert value to %s[%u]\n",
1270 name, i);
1271 return err;
1272 }
1273 }
1274 return 0;
1275}
1276
1277static int
1278foreach_key_array_ranges(map_config_func_t func, void *arg,
1279 const char *name, int map_fd,
1280 const struct bpf_map_def *pdef,
1281 struct bpf_map_op *op)
1282{
1283 unsigned int i, j;
1284 int err;
1285
1286 for (i = 0; i < op->k.array.nr_ranges; i++) {
1287 unsigned int start = op->k.array.ranges[i].start;
1288 size_t length = op->k.array.ranges[i].length;
1289
1290 for (j = 0; j < length; j++) {
1291 unsigned int idx = start + j;
1292
1293 err = func(name, map_fd, pdef, op, &idx, arg);
1294 if (err) {
1295 pr_debug("ERROR: failed to insert value to %s[%u]\n",
1296 name, idx);
1297 return err;
1298 }
1299 }
1300 }
1301 return 0;
1302}
1303
1304static int
1305bpf_map_config_foreach_key(struct bpf_map *map,
1306 map_config_func_t func,
1307 void *arg)
1308{
1309 int err, map_fd;
1310 struct bpf_map_op *op;
1311 const struct bpf_map_def *def;
1312 const char *name = bpf_map__name(map);
1313 struct bpf_map_priv *priv = bpf_map__priv(map);
1314
1315 if (IS_ERR(priv)) {
1316 pr_debug("ERROR: failed to get private from map %s\n", name);
1317 return -BPF_LOADER_ERRNO__INTERNAL;
1318 }
1319 if (!priv || list_empty(&priv->ops_list)) {
1320 pr_debug("INFO: nothing to config for map %s\n", name);
1321 return 0;
1322 }
1323
1324 def = bpf_map__def(map);
1325 if (IS_ERR(def)) {
1326 pr_debug("ERROR: failed to get definition from map %s\n", name);
1327 return -BPF_LOADER_ERRNO__INTERNAL;
1328 }
1329 map_fd = bpf_map__fd(map);
1330 if (map_fd < 0) {
1331 pr_debug("ERROR: failed to get fd from map %s\n", name);
1332 return map_fd;
1333 }
1334
1335 list_for_each_entry(op, &priv->ops_list, list) {
1336 switch (def->type) {
1337 case BPF_MAP_TYPE_ARRAY:
1338 case BPF_MAP_TYPE_PERF_EVENT_ARRAY:
1339 switch (op->key_type) {
1340 case BPF_MAP_KEY_ALL:
1341 err = foreach_key_array_all(func, arg, name,
1342 map_fd, def, op);
1343 break;
1344 case BPF_MAP_KEY_RANGES:
1345 err = foreach_key_array_ranges(func, arg, name,
1346 map_fd, def,
1347 op);
1348 break;
1349 default:
1350 pr_debug("ERROR: keytype for map '%s' invalid\n",
1351 name);
1352 return -BPF_LOADER_ERRNO__INTERNAL;
1353 }
1354 if (err)
1355 return err;
1356 break;
1357 default:
1358 pr_debug("ERROR: type of '%s' incorrect\n", name);
1359 return -BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE;
1360 }
1361 }
1362
1363 return 0;
1364}
1365
1366static int
1367apply_config_value_for_key(int map_fd, void *pkey,
1368 size_t val_size, u64 val)
1369{
1370 int err = 0;
1371
1372 switch (val_size) {
1373 case 1: {
1374 u8 _val = (u8)(val);
1375 err = bpf_map_update_elem(map_fd, pkey, &_val, BPF_ANY);
1376 break;
1377 }
1378 case 2: {
1379 u16 _val = (u16)(val);
1380 err = bpf_map_update_elem(map_fd, pkey, &_val, BPF_ANY);
1381 break;
1382 }
1383 case 4: {
1384 u32 _val = (u32)(val);
1385 err = bpf_map_update_elem(map_fd, pkey, &_val, BPF_ANY);
1386 break;
1387 }
1388 case 8: {
1389 err = bpf_map_update_elem(map_fd, pkey, &val, BPF_ANY);
1390 break;
1391 }
1392 default:
1393 pr_debug("ERROR: invalid value size\n");
1394 return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUESIZE;
1395 }
1396 if (err && errno)
1397 err = -errno;
1398 return err;
1399}
1400
1401static int
1402apply_config_evsel_for_key(const char *name, int map_fd, void *pkey,
1403 struct perf_evsel *evsel)
1404{
1405 struct xyarray *xy = evsel->fd;
1406 struct perf_event_attr *attr;
1407 unsigned int key, events;
1408 bool check_pass = false;
1409 int *evt_fd;
1410 int err;
1411
1412 if (!xy) {
1413 pr_debug("ERROR: evsel not ready for map %s\n", name);
1414 return -BPF_LOADER_ERRNO__INTERNAL;
1415 }
1416
1417 if (xy->row_size / xy->entry_size != 1) {
1418 pr_debug("ERROR: Dimension of target event is incorrect for map %s\n",
1419 name);
1420 return -BPF_LOADER_ERRNO__OBJCONF_MAP_EVTDIM;
1421 }
1422
1423 attr = &evsel->attr;
1424 if (attr->inherit) {
1425 pr_debug("ERROR: Can't put inherit event into map %s\n", name);
1426 return -BPF_LOADER_ERRNO__OBJCONF_MAP_EVTINH;
1427 }
1428
1429 if (perf_evsel__is_bpf_output(evsel))
1430 check_pass = true;
1431 if (attr->type == PERF_TYPE_RAW)
1432 check_pass = true;
1433 if (attr->type == PERF_TYPE_HARDWARE)
1434 check_pass = true;
1435 if (!check_pass) {
1436 pr_debug("ERROR: Event type is wrong for map %s\n", name);
1437 return -BPF_LOADER_ERRNO__OBJCONF_MAP_EVTTYPE;
1438 }
1439
1440 events = xy->entries / (xy->row_size / xy->entry_size);
1441 key = *((unsigned int *)pkey);
1442 if (key >= events) {
1443 pr_debug("ERROR: there is no event %d for map %s\n",
1444 key, name);
1445 return -BPF_LOADER_ERRNO__OBJCONF_MAP_MAPSIZE;
1446 }
1447 evt_fd = xyarray__entry(xy, key, 0);
1448 err = bpf_map_update_elem(map_fd, pkey, evt_fd, BPF_ANY);
1449 if (err && errno)
1450 err = -errno;
1451 return err;
1452}
1453
1454static int
1455apply_obj_config_map_for_key(const char *name, int map_fd,
1456 const struct bpf_map_def *pdef,
1457 struct bpf_map_op *op,
1458 void *pkey, void *arg __maybe_unused)
1459{
1460 int err;
1461
1462 switch (op->op_type) {
1463 case BPF_MAP_OP_SET_VALUE:
1464 err = apply_config_value_for_key(map_fd, pkey,
1465 pdef->value_size,
1466 op->v.value);
1467 break;
1468 case BPF_MAP_OP_SET_EVSEL:
1469 err = apply_config_evsel_for_key(name, map_fd, pkey,
1470 op->v.evsel);
1471 break;
1472 default:
1473 pr_debug("ERROR: unknown value type for '%s'\n", name);
1474 err = -BPF_LOADER_ERRNO__INTERNAL;
1475 }
1476 return err;
1477}
1478
1479static int
1480apply_obj_config_map(struct bpf_map *map)
1481{
1482 return bpf_map_config_foreach_key(map,
1483 apply_obj_config_map_for_key,
1484 NULL);
1485}
1486
1487static int
1488apply_obj_config_object(struct bpf_object *obj)
1489{
1490 struct bpf_map *map;
1491 int err;
1492
1493 bpf_object__for_each_map(map, obj) {
1494 err = apply_obj_config_map(map);
1495 if (err)
1496 return err;
1497 }
1498 return 0;
1499}
1500
1501int bpf__apply_obj_config(void)
1502{
1503 struct bpf_object *obj, *tmp;
1504 int err;
1505
1506 bpf_object__for_each_safe(obj, tmp) {
1507 err = apply_obj_config_object(obj);
1508 if (err)
1509 return err;
1510 }
1511
1512 return 0;
1513}
1514
1515#define bpf__for_each_map(pos, obj, objtmp) \
1516 bpf_object__for_each_safe(obj, objtmp) \
1517 bpf_object__for_each_map(pos, obj)
1518
1519#define bpf__for_each_map_named(pos, obj, objtmp, name) \
1520 bpf__for_each_map(pos, obj, objtmp) \
1521 if (bpf_map__name(pos) && \
1522 (strcmp(name, \
1523 bpf_map__name(pos)) == 0))
1524
1525struct perf_evsel *bpf__setup_output_event(struct perf_evlist *evlist, const char *name)
1526{
1527 struct bpf_map_priv *tmpl_priv = NULL;
1528 struct bpf_object *obj, *tmp;
1529 struct perf_evsel *evsel = NULL;
1530 struct bpf_map *map;
1531 int err;
1532 bool need_init = false;
1533
1534 bpf__for_each_map_named(map, obj, tmp, name) {
1535 struct bpf_map_priv *priv = bpf_map__priv(map);
1536
1537 if (IS_ERR(priv))
1538 return ERR_PTR(-BPF_LOADER_ERRNO__INTERNAL);
1539
1540
1541
1542
1543
1544 if (!need_init && !priv)
1545 need_init = !priv;
1546 if (!tmpl_priv && priv)
1547 tmpl_priv = priv;
1548 }
1549
1550 if (!need_init)
1551 return NULL;
1552
1553 if (!tmpl_priv) {
1554 char *event_definition = NULL;
1555
1556 if (asprintf(&event_definition, "bpf-output/no-inherit=1,name=%s/", name) < 0)
1557 return ERR_PTR(-ENOMEM);
1558
1559 err = parse_events(evlist, event_definition, NULL);
1560 free(event_definition);
1561
1562 if (err) {
1563 pr_debug("ERROR: failed to create the \"%s\" bpf-output event\n", name);
1564 return ERR_PTR(-err);
1565 }
1566
1567 evsel = perf_evlist__last(evlist);
1568 }
1569
1570 bpf__for_each_map_named(map, obj, tmp, name) {
1571 struct bpf_map_priv *priv = bpf_map__priv(map);
1572
1573 if (IS_ERR(priv))
1574 return ERR_PTR(-BPF_LOADER_ERRNO__INTERNAL);
1575 if (priv)
1576 continue;
1577
1578 if (tmpl_priv) {
1579 priv = bpf_map_priv__clone(tmpl_priv);
1580 if (!priv)
1581 return ERR_PTR(-ENOMEM);
1582
1583 err = bpf_map__set_priv(map, priv, bpf_map_priv__clear);
1584 if (err) {
1585 bpf_map_priv__clear(map, priv);
1586 return ERR_PTR(err);
1587 }
1588 } else if (evsel) {
1589 struct bpf_map_op *op;
1590
1591 op = bpf_map__add_newop(map, NULL);
1592 if (IS_ERR(op))
1593 return ERR_CAST(op);
1594 op->op_type = BPF_MAP_OP_SET_EVSEL;
1595 op->v.evsel = evsel;
1596 }
1597 }
1598
1599 return evsel;
1600}
1601
1602int bpf__setup_stdout(struct perf_evlist *evlist)
1603{
1604 struct perf_evsel *evsel = bpf__setup_output_event(evlist, "__bpf_stdout__");
1605 return PTR_ERR_OR_ZERO(evsel);
1606}
1607
1608#define ERRNO_OFFSET(e) ((e) - __BPF_LOADER_ERRNO__START)
1609#define ERRCODE_OFFSET(c) ERRNO_OFFSET(BPF_LOADER_ERRNO__##c)
1610#define NR_ERRNO (__BPF_LOADER_ERRNO__END - __BPF_LOADER_ERRNO__START)
1611
1612static const char *bpf_loader_strerror_table[NR_ERRNO] = {
1613 [ERRCODE_OFFSET(CONFIG)] = "Invalid config string",
1614 [ERRCODE_OFFSET(GROUP)] = "Invalid group name",
1615 [ERRCODE_OFFSET(EVENTNAME)] = "No event name found in config string",
1616 [ERRCODE_OFFSET(INTERNAL)] = "BPF loader internal error",
1617 [ERRCODE_OFFSET(COMPILE)] = "Error when compiling BPF scriptlet",
1618 [ERRCODE_OFFSET(PROGCONF_TERM)] = "Invalid program config term in config string",
1619 [ERRCODE_OFFSET(PROLOGUE)] = "Failed to generate prologue",
1620 [ERRCODE_OFFSET(PROLOGUE2BIG)] = "Prologue too big for program",
1621 [ERRCODE_OFFSET(PROLOGUEOOB)] = "Offset out of bound for prologue",
1622 [ERRCODE_OFFSET(OBJCONF_OPT)] = "Invalid object config option",
1623 [ERRCODE_OFFSET(OBJCONF_CONF)] = "Config value not set (missing '=')",
1624 [ERRCODE_OFFSET(OBJCONF_MAP_OPT)] = "Invalid object map config option",
1625 [ERRCODE_OFFSET(OBJCONF_MAP_NOTEXIST)] = "Target map doesn't exist",
1626 [ERRCODE_OFFSET(OBJCONF_MAP_VALUE)] = "Incorrect value type for map",
1627 [ERRCODE_OFFSET(OBJCONF_MAP_TYPE)] = "Incorrect map type",
1628 [ERRCODE_OFFSET(OBJCONF_MAP_KEYSIZE)] = "Incorrect map key size",
1629 [ERRCODE_OFFSET(OBJCONF_MAP_VALUESIZE)] = "Incorrect map value size",
1630 [ERRCODE_OFFSET(OBJCONF_MAP_NOEVT)] = "Event not found for map setting",
1631 [ERRCODE_OFFSET(OBJCONF_MAP_MAPSIZE)] = "Invalid map size for event setting",
1632 [ERRCODE_OFFSET(OBJCONF_MAP_EVTDIM)] = "Event dimension too large",
1633 [ERRCODE_OFFSET(OBJCONF_MAP_EVTINH)] = "Doesn't support inherit event",
1634 [ERRCODE_OFFSET(OBJCONF_MAP_EVTTYPE)] = "Wrong event type for map",
1635 [ERRCODE_OFFSET(OBJCONF_MAP_IDX2BIG)] = "Index too large",
1636};
1637
1638static int
1639bpf_loader_strerror(int err, char *buf, size_t size)
1640{
1641 char sbuf[STRERR_BUFSIZE];
1642 const char *msg;
1643
1644 if (!buf || !size)
1645 return -1;
1646
1647 err = err > 0 ? err : -err;
1648
1649 if (err >= __LIBBPF_ERRNO__START)
1650 return libbpf_strerror(err, buf, size);
1651
1652 if (err >= __BPF_LOADER_ERRNO__START && err < __BPF_LOADER_ERRNO__END) {
1653 msg = bpf_loader_strerror_table[ERRNO_OFFSET(err)];
1654 snprintf(buf, size, "%s", msg);
1655 buf[size - 1] = '\0';
1656 return 0;
1657 }
1658
1659 if (err >= __BPF_LOADER_ERRNO__END)
1660 snprintf(buf, size, "Unknown bpf loader error %d", err);
1661 else
1662 snprintf(buf, size, "%s",
1663 str_error_r(err, sbuf, sizeof(sbuf)));
1664
1665 buf[size - 1] = '\0';
1666 return -1;
1667}
1668
1669#define bpf__strerror_head(err, buf, size) \
1670 char sbuf[STRERR_BUFSIZE], *emsg;\
1671 if (!size)\
1672 return 0;\
1673 if (err < 0)\
1674 err = -err;\
1675 bpf_loader_strerror(err, sbuf, sizeof(sbuf));\
1676 emsg = sbuf;\
1677 switch (err) {\
1678 default:\
1679 scnprintf(buf, size, "%s", emsg);\
1680 break;
1681
1682#define bpf__strerror_entry(val, fmt...)\
1683 case val: {\
1684 scnprintf(buf, size, fmt);\
1685 break;\
1686 }
1687
1688#define bpf__strerror_end(buf, size)\
1689 }\
1690 buf[size - 1] = '\0';
1691
1692int bpf__strerror_prepare_load(const char *filename, bool source,
1693 int err, char *buf, size_t size)
1694{
1695 size_t n;
1696 int ret;
1697
1698 n = snprintf(buf, size, "Failed to load %s%s: ",
1699 filename, source ? " from source" : "");
1700 if (n >= size) {
1701 buf[size - 1] = '\0';
1702 return 0;
1703 }
1704 buf += n;
1705 size -= n;
1706
1707 ret = bpf_loader_strerror(err, buf, size);
1708 buf[size - 1] = '\0';
1709 return ret;
1710}
1711
1712int bpf__strerror_probe(struct bpf_object *obj __maybe_unused,
1713 int err, char *buf, size_t size)
1714{
1715 bpf__strerror_head(err, buf, size);
1716 case BPF_LOADER_ERRNO__PROGCONF_TERM: {
1717 scnprintf(buf, size, "%s (add -v to see detail)", emsg);
1718 break;
1719 }
1720 bpf__strerror_entry(EEXIST, "Probe point exist. Try 'perf probe -d \"*\"' and set 'force=yes'");
1721 bpf__strerror_entry(EACCES, "You need to be root");
1722 bpf__strerror_entry(EPERM, "You need to be root, and /proc/sys/kernel/kptr_restrict should be 0");
1723 bpf__strerror_entry(ENOENT, "You need to check probing points in BPF file");
1724 bpf__strerror_end(buf, size);
1725 return 0;
1726}
1727
1728int bpf__strerror_load(struct bpf_object *obj,
1729 int err, char *buf, size_t size)
1730{
1731 bpf__strerror_head(err, buf, size);
1732 case LIBBPF_ERRNO__KVER: {
1733 unsigned int obj_kver = bpf_object__kversion(obj);
1734 unsigned int real_kver;
1735
1736 if (fetch_kernel_version(&real_kver, NULL, 0)) {
1737 scnprintf(buf, size, "Unable to fetch kernel version");
1738 break;
1739 }
1740
1741 if (obj_kver != real_kver) {
1742 scnprintf(buf, size,
1743 "'version' ("KVER_FMT") doesn't match running kernel ("KVER_FMT")",
1744 KVER_PARAM(obj_kver),
1745 KVER_PARAM(real_kver));
1746 break;
1747 }
1748
1749 scnprintf(buf, size, "Failed to load program for unknown reason");
1750 break;
1751 }
1752 bpf__strerror_end(buf, size);
1753 return 0;
1754}
1755
1756int bpf__strerror_config_obj(struct bpf_object *obj __maybe_unused,
1757 struct parse_events_term *term __maybe_unused,
1758 struct perf_evlist *evlist __maybe_unused,
1759 int *error_pos __maybe_unused, int err,
1760 char *buf, size_t size)
1761{
1762 bpf__strerror_head(err, buf, size);
1763 bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE,
1764 "Can't use this config term with this map type");
1765 bpf__strerror_end(buf, size);
1766 return 0;
1767}
1768
1769int bpf__strerror_apply_obj_config(int err, char *buf, size_t size)
1770{
1771 bpf__strerror_head(err, buf, size);
1772 bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_EVTDIM,
1773 "Cannot set event to BPF map in multi-thread tracing");
1774 bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_EVTINH,
1775 "%s (Hint: use -i to turn off inherit)", emsg);
1776 bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_EVTTYPE,
1777 "Can only put raw, hardware and BPF output event into a BPF map");
1778 bpf__strerror_end(buf, size);
1779 return 0;
1780}
1781
1782int bpf__strerror_setup_output_event(struct perf_evlist *evlist __maybe_unused,
1783 int err, char *buf, size_t size)
1784{
1785 bpf__strerror_head(err, buf, size);
1786 bpf__strerror_end(buf, size);
1787 return 0;
1788}
1789
