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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 <linux/zalloc.h>
16#include <errno.h>
17#include "perf.h"
18#include "debug.h"
19#include "evlist.h"
20#include "bpf-loader.h"
21#include "bpf-prologue.h"
22#include "probe-event.h"
23#include "probe-finder.h"
24#include "parse-events.h"
25#include "strfilter.h"
26#include "llvm-utils.h"
27#include "c++/clang-c.h"
28
29static int libbpf_perf_print(enum libbpf_print_level level __attribute__((unused)),
30 const char *fmt, va_list args)
31{
32 return veprintf(1, verbose, pr_fmt(fmt), args);
33}
34
35struct bpf_prog_priv {
36 bool is_tp;
37 char *sys_name;
38 char *evt_name;
39 struct perf_probe_event pev;
40 bool need_prologue;
41 struct bpf_insn *insns_buf;
42 int nr_types;
43 int *type_mapping;
44};
45
46static bool libbpf_initialized;
47
48struct bpf_object *
49bpf__prepare_load_buffer(void *obj_buf, size_t obj_buf_sz, const char *name)
50{
51 struct bpf_object *obj;
52
53 if (!libbpf_initialized) {
54 libbpf_set_print(libbpf_perf_print);
55 libbpf_initialized = true;
56 }
57
58 obj = bpf_object__open_buffer(obj_buf, obj_buf_sz, name);
59 if (IS_ERR_OR_NULL(obj)) {
60 pr_debug("bpf: failed to load buffer\n");
61 return ERR_PTR(-EINVAL);
62 }
63
64 return obj;
65}
66
67struct bpf_object *bpf__prepare_load(const char *filename, bool source)
68{
69 struct bpf_object *obj;
70
71 if (!libbpf_initialized) {
72 libbpf_set_print(libbpf_perf_print);
73 libbpf_initialized = true;
74 }
75
76 if (source) {
77 int err;
78 void *obj_buf;
79 size_t obj_buf_sz;
80
81 perf_clang__init();
82 err = perf_clang__compile_bpf(filename, &obj_buf, &obj_buf_sz);
83 perf_clang__cleanup();
84 if (err) {
85 pr_debug("bpf: builtin compilation failed: %d, try external compiler\n", err);
86 err = llvm__compile_bpf(filename, &obj_buf, &obj_buf_sz);
87 if (err)
88 return ERR_PTR(-BPF_LOADER_ERRNO__COMPILE);
89 } else
90 pr_debug("bpf: successful builtin compilation\n");
91 obj = bpf_object__open_buffer(obj_buf, obj_buf_sz, filename);
92
93 if (!IS_ERR_OR_NULL(obj) && llvm_param.dump_obj)
94 llvm__dump_obj(filename, obj_buf, obj_buf_sz);
95
96 free(obj_buf);
97 } else
98 obj = bpf_object__open(filename);
99
100 if (IS_ERR_OR_NULL(obj)) {
101 pr_debug("bpf: failed to load %s\n", filename);
102 return obj;
103 }
104
105 return obj;
106}
107
108void bpf__clear(void)
109{
110 struct bpf_object *obj, *tmp;
111
112 bpf_object__for_each_safe(obj, tmp) {
113 bpf__unprobe(obj);
114 bpf_object__close(obj);
115 }
116}
117
118static void
119clear_prog_priv(struct bpf_program *prog __maybe_unused,
120 void *_priv)
121{
122 struct bpf_prog_priv *priv = _priv;
123
124 cleanup_perf_probe_events(&priv->pev, 1);
125 zfree(&priv->insns_buf);
126 zfree(&priv->type_mapping);
127 zfree(&priv->sys_name);
128 zfree(&priv->evt_name);
129 free(priv);
130}
131
132static int
133prog_config__exec(const char *value, struct perf_probe_event *pev)
134{
135 pev->uprobes = true;
136 pev->target = strdup(value);
137 if (!pev->target)
138 return -ENOMEM;
139 return 0;
140}
141
142static int
143prog_config__module(const char *value, struct perf_probe_event *pev)
144{
145 pev->uprobes = false;
146 pev->target = strdup(value);
147 if (!pev->target)
148 return -ENOMEM;
149 return 0;
150}
151
152static int
153prog_config__bool(const char *value, bool *pbool, bool invert)
154{
155 int err;
156 bool bool_value;
157
158 if (!pbool)
159 return -EINVAL;
160
161 err = strtobool(value, &bool_value);
162 if (err)
163 return err;
164
165 *pbool = invert ? !bool_value : bool_value;
166 return 0;
167}
168
169static int
170prog_config__inlines(const char *value,
171 struct perf_probe_event *pev __maybe_unused)
172{
173 return prog_config__bool(value, &probe_conf.no_inlines, true);
174}
175
176static int
177prog_config__force(const char *value,
178 struct perf_probe_event *pev __maybe_unused)
179{
180 return prog_config__bool(value, &probe_conf.force_add, false);
181}
182
183static struct {
184 const char *key;
185 const char *usage;
186 const char *desc;
187 int (*func)(const char *, struct perf_probe_event *);
188} bpf_prog_config_terms[] = {
189 {
190 .key = "exec",
191 .usage = "exec=<full path of file>",
192 .desc = "Set uprobe target",
193 .func = prog_config__exec,
194 },
195 {
196 .key = "module",
197 .usage = "module=<module name> ",
198 .desc = "Set kprobe module",
199 .func = prog_config__module,
200 },
201 {
202 .key = "inlines",
203 .usage = "inlines=[yes|no] ",
204 .desc = "Probe at inline symbol",
205 .func = prog_config__inlines,
206 },
207 {
208 .key = "force",
209 .usage = "force=[yes|no] ",
210 .desc = "Forcibly add events with existing name",
211 .func = prog_config__force,
212 },
213};
214
215static int
216do_prog_config(const char *key, const char *value,
217 struct perf_probe_event *pev)
218{
219 unsigned int i;
220
221 pr_debug("config bpf program: %s=%s\n", key, value);
222 for (i = 0; i < ARRAY_SIZE(bpf_prog_config_terms); i++)
223 if (strcmp(key, bpf_prog_config_terms[i].key) == 0)
224 return bpf_prog_config_terms[i].func(value, pev);
225
226 pr_debug("BPF: ERROR: invalid program config option: %s=%s\n",
227 key, value);
228
229 pr_debug("\nHint: Valid options are:\n");
230 for (i = 0; i < ARRAY_SIZE(bpf_prog_config_terms); i++)
231 pr_debug("\t%s:\t%s\n", bpf_prog_config_terms[i].usage,
232 bpf_prog_config_terms[i].desc);
233 pr_debug("\n");
234
235 return -BPF_LOADER_ERRNO__PROGCONF_TERM;
236}
237
238static const char *
239parse_prog_config_kvpair(const char *config_str, struct perf_probe_event *pev)
240{
241 char *text = strdup(config_str);
242 char *sep, *line;
243 const char *main_str = NULL;
244 int err = 0;
245
246 if (!text) {
247 pr_debug("Not enough memory: dup config_str failed\n");
248 return ERR_PTR(-ENOMEM);
249 }
250
251 line = text;
252 while ((sep = strchr(line, ';'))) {
253 char *equ;
254
255 *sep = '\0';
256 equ = strchr(line, '=');
257 if (!equ) {
258 pr_warning("WARNING: invalid config in BPF object: %s\n",
259 line);
260 pr_warning("\tShould be 'key=value'.\n");
261 goto nextline;
262 }
263 *equ = '\0';
264
265 err = do_prog_config(line, equ + 1, pev);
266 if (err)
267 break;
268nextline:
269 line = sep + 1;
270 }
271
272 if (!err)
273 main_str = config_str + (line - text);
274 free(text);
275
276 return err ? ERR_PTR(err) : main_str;
277}
278
279static int
280parse_prog_config(const char *config_str, const char **p_main_str,
281 bool *is_tp, struct perf_probe_event *pev)
282{
283 int err;
284 const char *main_str = parse_prog_config_kvpair(config_str, pev);
285
286 if (IS_ERR(main_str))
287 return PTR_ERR(main_str);
288
289 *p_main_str = main_str;
290 if (!strchr(main_str, '=')) {
291
292 const char *s = strchr(main_str, ':');
293
294 if (!s) {
295 pr_debug("bpf: '%s' is not a valid tracepoint\n",
296 config_str);
297 return -BPF_LOADER_ERRNO__CONFIG;
298 }
299
300 *is_tp = true;
301 return 0;
302 }
303
304 *is_tp = false;
305 err = parse_perf_probe_command(main_str, pev);
306 if (err < 0) {
307 pr_debug("bpf: '%s' is not a valid config string\n",
308 config_str);
309
310 return -BPF_LOADER_ERRNO__CONFIG;
311 }
312 return 0;
313}
314
315static int
316config_bpf_program(struct bpf_program *prog)
317{
318 struct perf_probe_event *pev = NULL;
319 struct bpf_prog_priv *priv = NULL;
320 const char *config_str, *main_str;
321 bool is_tp = false;
322 int err;
323
324
325 probe_conf.no_inlines = false;
326 probe_conf.force_add = false;
327
328 config_str = bpf_program__title(prog, false);
329 if (IS_ERR(config_str)) {
330 pr_debug("bpf: unable to get title for program\n");
331 return PTR_ERR(config_str);
332 }
333
334 priv = calloc(sizeof(*priv), 1);
335 if (!priv) {
336 pr_debug("bpf: failed to alloc priv\n");
337 return -ENOMEM;
338 }
339 pev = &priv->pev;
340
341 pr_debug("bpf: config program '%s'\n", config_str);
342 err = parse_prog_config(config_str, &main_str, &is_tp, pev);
343 if (err)
344 goto errout;
345
346 if (is_tp) {
347 char *s = strchr(main_str, ':');
348
349 priv->is_tp = true;
350 priv->sys_name = strndup(main_str, s - main_str);
351 priv->evt_name = strdup(s + 1);
352 goto set_priv;
353 }
354
355 if (pev->group && strcmp(pev->group, PERF_BPF_PROBE_GROUP)) {
356 pr_debug("bpf: '%s': group for event is set and not '%s'.\n",
357 config_str, PERF_BPF_PROBE_GROUP);
358 err = -BPF_LOADER_ERRNO__GROUP;
359 goto errout;
360 } else if (!pev->group)
361 pev->group = strdup(PERF_BPF_PROBE_GROUP);
362
363 if (!pev->group) {
364 pr_debug("bpf: strdup failed\n");
365 err = -ENOMEM;
366 goto errout;
367 }
368
369 if (!pev->event) {
370 pr_debug("bpf: '%s': event name is missing. Section name should be 'key=value'\n",
371 config_str);
372 err = -BPF_LOADER_ERRNO__EVENTNAME;
373 goto errout;
374 }
375 pr_debug("bpf: config '%s' is ok\n", config_str);
376
377set_priv:
378 err = bpf_program__set_priv(prog, priv, clear_prog_priv);
379 if (err) {
380 pr_debug("Failed to set priv for program '%s'\n", config_str);
381 goto errout;
382 }
383
384 return 0;
385
386errout:
387 if (pev)
388 clear_perf_probe_event(pev);
389 free(priv);
390 return err;
391}
392
393static int bpf__prepare_probe(void)
394{
395 static int err = 0;
396 static bool initialized = false;
397
398
399
400
401
402
403 if (initialized)
404 return err;
405
406 initialized = true;
407 err = init_probe_symbol_maps(false);
408 if (err < 0)
409 pr_debug("Failed to init_probe_symbol_maps\n");
410 probe_conf.max_probes = MAX_PROBES;
411 return err;
412}
413
414static int
415preproc_gen_prologue(struct bpf_program *prog, int n,
416 struct bpf_insn *orig_insns, int orig_insns_cnt,
417 struct bpf_prog_prep_result *res)
418{
419 struct bpf_prog_priv *priv = bpf_program__priv(prog);
420 struct probe_trace_event *tev;
421 struct perf_probe_event *pev;
422 struct bpf_insn *buf;
423 size_t prologue_cnt = 0;
424 int i, err;
425
426 if (IS_ERR(priv) || !priv || priv->is_tp)
427 goto errout;
428
429 pev = &priv->pev;
430
431 if (n < 0 || n >= priv->nr_types)
432 goto errout;
433
434
435 for (i = 0; i < pev->ntevs; i++) {
436 if (priv->type_mapping[i] == n)
437 break;
438 }
439
440 if (i >= pev->ntevs) {
441 pr_debug("Internal error: prologue type %d not found\n", n);
442 return -BPF_LOADER_ERRNO__PROLOGUE;
443 }
444
445 tev = &pev->tevs[i];
446
447 buf = priv->insns_buf;
448 err = bpf__gen_prologue(tev->args, tev->nargs,
449 buf, &prologue_cnt,
450 BPF_MAXINSNS - orig_insns_cnt);
451 if (err) {
452 const char *title;
453
454 title = bpf_program__title(prog, false);
455 if (!title)
456 title = "[unknown]";
457
458 pr_debug("Failed to generate prologue for program %s\n",
459 title);
460 return err;
461 }
462
463 memcpy(&buf[prologue_cnt], orig_insns,
464 sizeof(struct bpf_insn) * orig_insns_cnt);
465
466 res->new_insn_ptr = buf;
467 res->new_insn_cnt = prologue_cnt + orig_insns_cnt;
468 res->pfd = NULL;
469 return 0;
470
471errout:
472 pr_debug("Internal error in preproc_gen_prologue\n");
473 return -BPF_LOADER_ERRNO__PROLOGUE;
474}
475
476
477
478
479
480static int compare_tev_args(const void *ptev1, const void *ptev2)
481{
482 int i, ret;
483 const struct probe_trace_event *tev1 =
484 *(const struct probe_trace_event **)ptev1;
485 const struct probe_trace_event *tev2 =
486 *(const struct probe_trace_event **)ptev2;
487
488 ret = tev2->nargs - tev1->nargs;
489 if (ret)
490 return ret;
491
492 for (i = 0; i < tev1->nargs; i++) {
493 struct probe_trace_arg *arg1, *arg2;
494 struct probe_trace_arg_ref *ref1, *ref2;
495
496 arg1 = &tev1->args[i];
497 arg2 = &tev2->args[i];
498
499 ret = strcmp(arg1->value, arg2->value);
500 if (ret)
501 return ret;
502
503 ref1 = arg1->ref;
504 ref2 = arg2->ref;
505
506 while (ref1 && ref2) {
507 ret = ref2->offset - ref1->offset;
508 if (ret)
509 return ret;
510
511 ref1 = ref1->next;
512 ref2 = ref2->next;
513 }
514
515 if (ref1 || ref2)
516 return ref2 ? 1 : -1;
517 }
518
519 return 0;
520}
521
522
523
524
525
526
527static int map_prologue(struct perf_probe_event *pev, int *mapping,
528 int *nr_types)
529{
530 int i, type = 0;
531 struct probe_trace_event **ptevs;
532
533 size_t array_sz = sizeof(*ptevs) * pev->ntevs;
534
535 ptevs = malloc(array_sz);
536 if (!ptevs) {
537 pr_debug("Not enough memory: alloc ptevs failed\n");
538 return -ENOMEM;
539 }
540
541 pr_debug("In map_prologue, ntevs=%d\n", pev->ntevs);
542 for (i = 0; i < pev->ntevs; i++)
543 ptevs[i] = &pev->tevs[i];
544
545 qsort(ptevs, pev->ntevs, sizeof(*ptevs),
546 compare_tev_args);
547
548 for (i = 0; i < pev->ntevs; i++) {
549 int n;
550
551 n = ptevs[i] - pev->tevs;
552 if (i == 0) {
553 mapping[n] = type;
554 pr_debug("mapping[%d]=%d\n", n, type);
555 continue;
556 }
557
558 if (compare_tev_args(ptevs + i, ptevs + i - 1) == 0)
559 mapping[n] = type;
560 else
561 mapping[n] = ++type;
562
563 pr_debug("mapping[%d]=%d\n", n, mapping[n]);
564 }
565 free(ptevs);
566 *nr_types = type + 1;
567
568 return 0;
569}
570
571static int hook_load_preprocessor(struct bpf_program *prog)
572{
573 struct bpf_prog_priv *priv = bpf_program__priv(prog);
574 struct perf_probe_event *pev;
575 bool need_prologue = false;
576 int err, i;
577
578 if (IS_ERR(priv) || !priv) {
579 pr_debug("Internal error when hook preprocessor\n");
580 return -BPF_LOADER_ERRNO__INTERNAL;
581 }
582
583 if (priv->is_tp) {
584 priv->need_prologue = false;
585 return 0;
586 }
587
588 pev = &priv->pev;
589 for (i = 0; i < pev->ntevs; i++) {
590 struct probe_trace_event *tev = &pev->tevs[i];
591
592 if (tev->nargs > 0) {
593 need_prologue = true;
594 break;
595 }
596 }
597
598
599
600
601
602 if (!need_prologue) {
603 priv->need_prologue = false;
604 return 0;
605 }
606
607 priv->need_prologue = true;
608 priv->insns_buf = malloc(sizeof(struct bpf_insn) * BPF_MAXINSNS);
609 if (!priv->insns_buf) {
610 pr_debug("Not enough memory: alloc insns_buf failed\n");
611 return -ENOMEM;
612 }
613
614 priv->type_mapping = malloc(sizeof(int) * pev->ntevs);
615 if (!priv->type_mapping) {
616 pr_debug("Not enough memory: alloc type_mapping failed\n");
617 return -ENOMEM;
618 }
619 memset(priv->type_mapping, -1,
620 sizeof(int) * pev->ntevs);
621
622 err = map_prologue(pev, priv->type_mapping, &priv->nr_types);
623 if (err)
624 return err;
625
626 err = bpf_program__set_prep(prog, priv->nr_types,
627 preproc_gen_prologue);
628 return err;
629}
630
631int bpf__probe(struct bpf_object *obj)
632{
633 int err = 0;
634 struct bpf_program *prog;
635 struct bpf_prog_priv *priv;
636 struct perf_probe_event *pev;
637
638 err = bpf__prepare_probe();
639 if (err) {
640 pr_debug("bpf__prepare_probe failed\n");
641 return err;
642 }
643
644 bpf_object__for_each_program(prog, obj) {
645 err = config_bpf_program(prog);
646 if (err)
647 goto out;
648
649 priv = bpf_program__priv(prog);
650 if (IS_ERR(priv) || !priv) {
651 err = PTR_ERR(priv);
652 goto out;
653 }
654
655 if (priv->is_tp) {
656 bpf_program__set_tracepoint(prog);
657 continue;
658 }
659
660 bpf_program__set_kprobe(prog);
661 pev = &priv->pev;
662
663 err = convert_perf_probe_events(pev, 1);
664 if (err < 0) {
665 pr_debug("bpf_probe: failed to convert perf probe events\n");
666 goto out;
667 }
668
669 err = apply_perf_probe_events(pev, 1);
670 if (err < 0) {
671 pr_debug("bpf_probe: failed to apply perf probe events\n");
672 goto out;
673 }
674
675
676
677
678
679
680
681
682
683 err = hook_load_preprocessor(prog);
684 if (err)
685 goto out;
686 }
687out:
688 return err < 0 ? err : 0;
689}
690
691#define EVENTS_WRITE_BUFSIZE 4096
692int bpf__unprobe(struct bpf_object *obj)
693{
694 int err, ret = 0;
695 struct bpf_program *prog;
696
697 bpf_object__for_each_program(prog, obj) {
698 struct bpf_prog_priv *priv = bpf_program__priv(prog);
699 int i;
700
701 if (IS_ERR(priv) || !priv || priv->is_tp)
702 continue;
703
704 for (i = 0; i < priv->pev.ntevs; i++) {
705 struct probe_trace_event *tev = &priv->pev.tevs[i];
706 char name_buf[EVENTS_WRITE_BUFSIZE];
707 struct strfilter *delfilter;
708
709 snprintf(name_buf, EVENTS_WRITE_BUFSIZE,
710 "%s:%s", tev->group, tev->event);
711 name_buf[EVENTS_WRITE_BUFSIZE - 1] = '\0';
712
713 delfilter = strfilter__new(name_buf, NULL);
714 if (!delfilter) {
715 pr_debug("Failed to create filter for unprobing\n");
716 ret = -ENOMEM;
717 continue;
718 }
719
720 err = del_perf_probe_events(delfilter);
721 strfilter__delete(delfilter);
722 if (err) {
723 pr_debug("Failed to delete %s\n", name_buf);
724 ret = err;
725 continue;
726 }
727 }
728 }
729 return ret;
730}
731
732int bpf__load(struct bpf_object *obj)
733{
734 int err;
735
736 err = bpf_object__load(obj);
737 if (err) {
738 char bf[128];
739 libbpf_strerror(err, bf, sizeof(bf));
740 pr_debug("bpf: load objects failed: err=%d: (%s)\n", err, bf);
741 return err;
742 }
743 return 0;
744}
745
746int bpf__foreach_event(struct bpf_object *obj,
747 bpf_prog_iter_callback_t func,
748 void *arg)
749{
750 struct bpf_program *prog;
751 int err;
752
753 bpf_object__for_each_program(prog, obj) {
754 struct bpf_prog_priv *priv = bpf_program__priv(prog);
755 struct probe_trace_event *tev;
756 struct perf_probe_event *pev;
757 int i, fd;
758
759 if (IS_ERR(priv) || !priv) {
760 pr_debug("bpf: failed to get private field\n");
761 return -BPF_LOADER_ERRNO__INTERNAL;
762 }
763
764 if (priv->is_tp) {
765 fd = bpf_program__fd(prog);
766 err = (*func)(priv->sys_name, priv->evt_name, fd, arg);
767 if (err) {
768 pr_debug("bpf: tracepoint call back failed, stop iterate\n");
769 return err;
770 }
771 continue;
772 }
773
774 pev = &priv->pev;
775 for (i = 0; i < pev->ntevs; i++) {
776 tev = &pev->tevs[i];
777
778 if (priv->need_prologue) {
779 int type = priv->type_mapping[i];
780
781 fd = bpf_program__nth_fd(prog, type);
782 } else {
783 fd = bpf_program__fd(prog);
784 }
785
786 if (fd < 0) {
787 pr_debug("bpf: failed to get file descriptor\n");
788 return fd;
789 }
790
791 err = (*func)(tev->group, tev->event, fd, arg);
792 if (err) {
793 pr_debug("bpf: call back failed, stop iterate\n");
794 return err;
795 }
796 }
797 }
798 return 0;
799}
800
801enum bpf_map_op_type {
802 BPF_MAP_OP_SET_VALUE,
803 BPF_MAP_OP_SET_EVSEL,
804};
805
806enum bpf_map_key_type {
807 BPF_MAP_KEY_ALL,
808 BPF_MAP_KEY_RANGES,
809};
810
811struct bpf_map_op {
812 struct list_head list;
813 enum bpf_map_op_type op_type;
814 enum bpf_map_key_type key_type;
815 union {
816 struct parse_events_array array;
817 } k;
818 union {
819 u64 value;
820 struct perf_evsel *evsel;
821 } v;
822};
823
824struct bpf_map_priv {
825 struct list_head ops_list;
826};
827
828static void
829bpf_map_op__delete(struct bpf_map_op *op)
830{
831 if (!list_empty(&op->list))
832 list_del_init(&op->list);
833 if (op->key_type == BPF_MAP_KEY_RANGES)
834 parse_events__clear_array(&op->k.array);
835 free(op);
836}
837
838static void
839bpf_map_priv__purge(struct bpf_map_priv *priv)
840{
841 struct bpf_map_op *pos, *n;
842
843 list_for_each_entry_safe(pos, n, &priv->ops_list, list) {
844 list_del_init(&pos->list);
845 bpf_map_op__delete(pos);
846 }
847}
848
849static void
850bpf_map_priv__clear(struct bpf_map *map __maybe_unused,
851 void *_priv)
852{
853 struct bpf_map_priv *priv = _priv;
854
855 bpf_map_priv__purge(priv);
856 free(priv);
857}
858
859static int
860bpf_map_op_setkey(struct bpf_map_op *op, struct parse_events_term *term)
861{
862 op->key_type = BPF_MAP_KEY_ALL;
863 if (!term)
864 return 0;
865
866 if (term->array.nr_ranges) {
867 size_t memsz = term->array.nr_ranges *
868 sizeof(op->k.array.ranges[0]);
869
870 op->k.array.ranges = memdup(term->array.ranges, memsz);
871 if (!op->k.array.ranges) {
872 pr_debug("Not enough memory to alloc indices for map\n");
873 return -ENOMEM;
874 }
875 op->key_type = BPF_MAP_KEY_RANGES;
876 op->k.array.nr_ranges = term->array.nr_ranges;
877 }
878 return 0;
879}
880
881static struct bpf_map_op *
882bpf_map_op__new(struct parse_events_term *term)
883{
884 struct bpf_map_op *op;
885 int err;
886
887 op = zalloc(sizeof(*op));
888 if (!op) {
889 pr_debug("Failed to alloc bpf_map_op\n");
890 return ERR_PTR(-ENOMEM);
891 }
892 INIT_LIST_HEAD(&op->list);
893
894 err = bpf_map_op_setkey(op, term);
895 if (err) {
896 free(op);
897 return ERR_PTR(err);
898 }
899 return op;
900}
901
902static struct bpf_map_op *
903bpf_map_op__clone(struct bpf_map_op *op)
904{
905 struct bpf_map_op *newop;
906
907 newop = memdup(op, sizeof(*op));
908 if (!newop) {
909 pr_debug("Failed to alloc bpf_map_op\n");
910 return NULL;
911 }
912
913 INIT_LIST_HEAD(&newop->list);
914 if (op->key_type == BPF_MAP_KEY_RANGES) {
915 size_t memsz = op->k.array.nr_ranges *
916 sizeof(op->k.array.ranges[0]);
917
918 newop->k.array.ranges = memdup(op->k.array.ranges, memsz);
919 if (!newop->k.array.ranges) {
920 pr_debug("Failed to alloc indices for map\n");
921 free(newop);
922 return NULL;
923 }
924 }
925
926 return newop;
927}
928
929static struct bpf_map_priv *
930bpf_map_priv__clone(struct bpf_map_priv *priv)
931{
932 struct bpf_map_priv *newpriv;
933 struct bpf_map_op *pos, *newop;
934
935 newpriv = zalloc(sizeof(*newpriv));
936 if (!newpriv) {
937 pr_debug("Not enough memory to alloc map private\n");
938 return NULL;
939 }
940 INIT_LIST_HEAD(&newpriv->ops_list);
941
942 list_for_each_entry(pos, &priv->ops_list, list) {
943 newop = bpf_map_op__clone(pos);
944 if (!newop) {
945 bpf_map_priv__purge(newpriv);
946 return NULL;
947 }
948 list_add_tail(&newop->list, &newpriv->ops_list);
949 }
950
951 return newpriv;
952}
953
954static int
955bpf_map__add_op(struct bpf_map *map, struct bpf_map_op *op)
956{
957 const char *map_name = bpf_map__name(map);
958 struct bpf_map_priv *priv = bpf_map__priv(map);
959
960 if (IS_ERR(priv)) {
961 pr_debug("Failed to get private from map %s\n", map_name);
962 return PTR_ERR(priv);
963 }
964
965 if (!priv) {
966 priv = zalloc(sizeof(*priv));
967 if (!priv) {
968 pr_debug("Not enough memory to alloc map private\n");
969 return -ENOMEM;
970 }
971 INIT_LIST_HEAD(&priv->ops_list);
972
973 if (bpf_map__set_priv(map, priv, bpf_map_priv__clear)) {
974 free(priv);
975 return -BPF_LOADER_ERRNO__INTERNAL;
976 }
977 }
978
979 list_add_tail(&op->list, &priv->ops_list);
980 return 0;
981}
982
983static struct bpf_map_op *
984bpf_map__add_newop(struct bpf_map *map, struct parse_events_term *term)
985{
986 struct bpf_map_op *op;
987 int err;
988
989 op = bpf_map_op__new(term);
990 if (IS_ERR(op))
991 return op;
992
993 err = bpf_map__add_op(map, op);
994 if (err) {
995 bpf_map_op__delete(op);
996 return ERR_PTR(err);
997 }
998 return op;
999}
1000
1001static int
1002__bpf_map__config_value(struct bpf_map *map,
1003 struct parse_events_term *term)
1004{
1005 struct bpf_map_op *op;
1006 const char *map_name = bpf_map__name(map);
1007 const struct bpf_map_def *def = bpf_map__def(map);
1008
1009 if (IS_ERR(def)) {
1010 pr_debug("Unable to get map definition from '%s'\n",
1011 map_name);
1012 return -BPF_LOADER_ERRNO__INTERNAL;
1013 }
1014
1015 if (def->type != BPF_MAP_TYPE_ARRAY) {
1016 pr_debug("Map %s type is not BPF_MAP_TYPE_ARRAY\n",
1017 map_name);
1018 return -BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE;
1019 }
1020 if (def->key_size < sizeof(unsigned int)) {
1021 pr_debug("Map %s has incorrect key size\n", map_name);
1022 return -BPF_LOADER_ERRNO__OBJCONF_MAP_KEYSIZE;
1023 }
1024 switch (def->value_size) {
1025 case 1:
1026 case 2:
1027 case 4:
1028 case 8:
1029 break;
1030 default:
1031 pr_debug("Map %s has incorrect value size\n", map_name);
1032 return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUESIZE;
1033 }
1034
1035 op = bpf_map__add_newop(map, term);
1036 if (IS_ERR(op))
1037 return PTR_ERR(op);
1038 op->op_type = BPF_MAP_OP_SET_VALUE;
1039 op->v.value = term->val.num;
1040 return 0;
1041}
1042
1043static int
1044bpf_map__config_value(struct bpf_map *map,
1045 struct parse_events_term *term,
1046 struct perf_evlist *evlist __maybe_unused)
1047{
1048 if (!term->err_val) {
1049 pr_debug("Config value not set\n");
1050 return -BPF_LOADER_ERRNO__OBJCONF_CONF;
1051 }
1052
1053 if (term->type_val != PARSE_EVENTS__TERM_TYPE_NUM) {
1054 pr_debug("ERROR: wrong value type for 'value'\n");
1055 return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUE;
1056 }
1057
1058 return __bpf_map__config_value(map, term);
1059}
1060
1061static int
1062__bpf_map__config_event(struct bpf_map *map,
1063 struct parse_events_term *term,
1064 struct perf_evlist *evlist)
1065{
1066 struct perf_evsel *evsel;
1067 const struct bpf_map_def *def;
1068 struct bpf_map_op *op;
1069 const char *map_name = bpf_map__name(map);
1070
1071 evsel = perf_evlist__find_evsel_by_str(evlist, term->val.str);
1072 if (!evsel) {
1073 pr_debug("Event (for '%s') '%s' doesn't exist\n",
1074 map_name, term->val.str);
1075 return -BPF_LOADER_ERRNO__OBJCONF_MAP_NOEVT;
1076 }
1077
1078 def = bpf_map__def(map);
1079 if (IS_ERR(def)) {
1080 pr_debug("Unable to get map definition from '%s'\n",
1081 map_name);
1082 return PTR_ERR(def);
1083 }
1084
1085
1086
1087
1088
1089 if (def->type != BPF_MAP_TYPE_PERF_EVENT_ARRAY) {
1090 pr_debug("Map %s type is not BPF_MAP_TYPE_PERF_EVENT_ARRAY\n",
1091 map_name);
1092 return -BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE;
1093 }
1094
1095 op = bpf_map__add_newop(map, term);
1096 if (IS_ERR(op))
1097 return PTR_ERR(op);
1098 op->op_type = BPF_MAP_OP_SET_EVSEL;
1099 op->v.evsel = evsel;
1100 return 0;
1101}
1102
1103static int
1104bpf_map__config_event(struct bpf_map *map,
1105 struct parse_events_term *term,
1106 struct perf_evlist *evlist)
1107{
1108 if (!term->err_val) {
1109 pr_debug("Config value not set\n");
1110 return -BPF_LOADER_ERRNO__OBJCONF_CONF;
1111 }
1112
1113 if (term->type_val != PARSE_EVENTS__TERM_TYPE_STR) {
1114 pr_debug("ERROR: wrong value type for 'event'\n");
1115 return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUE;
1116 }
1117
1118 return __bpf_map__config_event(map, term, evlist);
1119}
1120
1121struct bpf_obj_config__map_func {
1122 const char *config_opt;
1123 int (*config_func)(struct bpf_map *, struct parse_events_term *,
1124 struct perf_evlist *);
1125};
1126
1127struct bpf_obj_config__map_func bpf_obj_config__map_funcs[] = {
1128 {"value", bpf_map__config_value},
1129 {"event", bpf_map__config_event},
1130};
1131
1132static int
1133config_map_indices_range_check(struct parse_events_term *term,
1134 struct bpf_map *map,
1135 const char *map_name)
1136{
1137 struct parse_events_array *array = &term->array;
1138 const struct bpf_map_def *def;
1139 unsigned int i;
1140
1141 if (!array->nr_ranges)
1142 return 0;
1143 if (!array->ranges) {
1144 pr_debug("ERROR: map %s: array->nr_ranges is %d but range array is NULL\n",
1145 map_name, (int)array->nr_ranges);
1146 return -BPF_LOADER_ERRNO__INTERNAL;
1147 }
1148
1149 def = bpf_map__def(map);
1150 if (IS_ERR(def)) {
1151 pr_debug("ERROR: Unable to get map definition from '%s'\n",
1152 map_name);
1153 return -BPF_LOADER_ERRNO__INTERNAL;
1154 }
1155
1156 for (i = 0; i < array->nr_ranges; i++) {
1157 unsigned int start = array->ranges[i].start;
1158 size_t length = array->ranges[i].length;
1159 unsigned int idx = start + length - 1;
1160
1161 if (idx >= def->max_entries) {
1162 pr_debug("ERROR: index %d too large\n", idx);
1163 return -BPF_LOADER_ERRNO__OBJCONF_MAP_IDX2BIG;
1164 }
1165 }
1166 return 0;
1167}
1168
1169static int
1170bpf__obj_config_map(struct bpf_object *obj,
1171 struct parse_events_term *term,
1172 struct perf_evlist *evlist,
1173 int *key_scan_pos)
1174{
1175
1176 char *map_name = strdup(term->config + sizeof("map:") - 1);
1177 struct bpf_map *map;
1178 int err = -BPF_LOADER_ERRNO__OBJCONF_OPT;
1179 char *map_opt;
1180 size_t i;
1181
1182 if (!map_name)
1183 return -ENOMEM;
1184
1185 map_opt = strchr(map_name, '.');
1186 if (!map_opt) {
1187 pr_debug("ERROR: Invalid map config: %s\n", map_name);
1188 goto out;
1189 }
1190
1191 *map_opt++ = '\0';
1192 if (*map_opt == '\0') {
1193 pr_debug("ERROR: Invalid map option: %s\n", term->config);
1194 goto out;
1195 }
1196
1197 map = bpf_object__find_map_by_name(obj, map_name);
1198 if (!map) {
1199 pr_debug("ERROR: Map %s doesn't exist\n", map_name);
1200 err = -BPF_LOADER_ERRNO__OBJCONF_MAP_NOTEXIST;
1201 goto out;
1202 }
1203
1204 *key_scan_pos += strlen(map_opt);
1205 err = config_map_indices_range_check(term, map, map_name);
1206 if (err)
1207 goto out;
1208 *key_scan_pos -= strlen(map_opt);
1209
1210 for (i = 0; i < ARRAY_SIZE(bpf_obj_config__map_funcs); i++) {
1211 struct bpf_obj_config__map_func *func =
1212 &bpf_obj_config__map_funcs[i];
1213
1214 if (strcmp(map_opt, func->config_opt) == 0) {
1215 err = func->config_func(map, term, evlist);
1216 goto out;
1217 }
1218 }
1219
1220 pr_debug("ERROR: Invalid map config option '%s'\n", map_opt);
1221 err = -BPF_LOADER_ERRNO__OBJCONF_MAP_OPT;
1222out:
1223 free(map_name);
1224 if (!err)
1225 key_scan_pos += strlen(map_opt);
1226 return err;
1227}
1228
1229int bpf__config_obj(struct bpf_object *obj,
1230 struct parse_events_term *term,
1231 struct perf_evlist *evlist,
1232 int *error_pos)
1233{
1234 int key_scan_pos = 0;
1235 int err;
1236
1237 if (!obj || !term || !term->config)
1238 return -EINVAL;
1239
1240 if (strstarts(term->config, "map:")) {
1241 key_scan_pos = sizeof("map:") - 1;
1242 err = bpf__obj_config_map(obj, term, evlist, &key_scan_pos);
1243 goto out;
1244 }
1245 err = -BPF_LOADER_ERRNO__OBJCONF_OPT;
1246out:
1247 if (error_pos)
1248 *error_pos = key_scan_pos;
1249 return err;
1250
1251}
1252
1253typedef int (*map_config_func_t)(const char *name, int map_fd,
1254 const struct bpf_map_def *pdef,
1255 struct bpf_map_op *op,
1256 void *pkey, void *arg);
1257
1258static int
1259foreach_key_array_all(map_config_func_t func,
1260 void *arg, const char *name,
1261 int map_fd, const struct bpf_map_def *pdef,
1262 struct bpf_map_op *op)
1263{
1264 unsigned int i;
1265 int err;
1266
1267 for (i = 0; i < pdef->max_entries; i++) {
1268 err = func(name, map_fd, pdef, op, &i, arg);
1269 if (err) {
1270 pr_debug("ERROR: failed to insert value to %s[%u]\n",
1271 name, i);
1272 return err;
1273 }
1274 }
1275 return 0;
1276}
1277
1278static int
1279foreach_key_array_ranges(map_config_func_t func, void *arg,
1280 const char *name, int map_fd,
1281 const struct bpf_map_def *pdef,
1282 struct bpf_map_op *op)
1283{
1284 unsigned int i, j;
1285 int err;
1286
1287 for (i = 0; i < op->k.array.nr_ranges; i++) {
1288 unsigned int start = op->k.array.ranges[i].start;
1289 size_t length = op->k.array.ranges[i].length;
1290
1291 for (j = 0; j < length; j++) {
1292 unsigned int idx = start + j;
1293
1294 err = func(name, map_fd, pdef, op, &idx, arg);
1295 if (err) {
1296 pr_debug("ERROR: failed to insert value to %s[%u]\n",
1297 name, idx);
1298 return err;
1299 }
1300 }
1301 }
1302 return 0;
1303}
1304
1305static int
1306bpf_map_config_foreach_key(struct bpf_map *map,
1307 map_config_func_t func,
1308 void *arg)
1309{
1310 int err, map_fd;
1311 struct bpf_map_op *op;
1312 const struct bpf_map_def *def;
1313 const char *name = bpf_map__name(map);
1314 struct bpf_map_priv *priv = bpf_map__priv(map);
1315
1316 if (IS_ERR(priv)) {
1317 pr_debug("ERROR: failed to get private from map %s\n", name);
1318 return -BPF_LOADER_ERRNO__INTERNAL;
1319 }
1320 if (!priv || list_empty(&priv->ops_list)) {
1321 pr_debug("INFO: nothing to config for map %s\n", name);
1322 return 0;
1323 }
1324
1325 def = bpf_map__def(map);
1326 if (IS_ERR(def)) {
1327 pr_debug("ERROR: failed to get definition from map %s\n", name);
1328 return -BPF_LOADER_ERRNO__INTERNAL;
1329 }
1330 map_fd = bpf_map__fd(map);
1331 if (map_fd < 0) {
1332 pr_debug("ERROR: failed to get fd from map %s\n", name);
1333 return map_fd;
1334 }
1335
1336 list_for_each_entry(op, &priv->ops_list, list) {
1337 switch (def->type) {
1338 case BPF_MAP_TYPE_ARRAY:
1339 case BPF_MAP_TYPE_PERF_EVENT_ARRAY:
1340 switch (op->key_type) {
1341 case BPF_MAP_KEY_ALL:
1342 err = foreach_key_array_all(func, arg, name,
1343 map_fd, def, op);
1344 break;
1345 case BPF_MAP_KEY_RANGES:
1346 err = foreach_key_array_ranges(func, arg, name,
1347 map_fd, def,
1348 op);
1349 break;
1350 default:
1351 pr_debug("ERROR: keytype for map '%s' invalid\n",
1352 name);
1353 return -BPF_LOADER_ERRNO__INTERNAL;
1354 }
1355 if (err)
1356 return err;
1357 break;
1358 default:
1359 pr_debug("ERROR: type of '%s' incorrect\n", name);
1360 return -BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE;
1361 }
1362 }
1363
1364 return 0;
1365}
1366
1367static int
1368apply_config_value_for_key(int map_fd, void *pkey,
1369 size_t val_size, u64 val)
1370{
1371 int err = 0;
1372
1373 switch (val_size) {
1374 case 1: {
1375 u8 _val = (u8)(val);
1376 err = bpf_map_update_elem(map_fd, pkey, &_val, BPF_ANY);
1377 break;
1378 }
1379 case 2: {
1380 u16 _val = (u16)(val);
1381 err = bpf_map_update_elem(map_fd, pkey, &_val, BPF_ANY);
1382 break;
1383 }
1384 case 4: {
1385 u32 _val = (u32)(val);
1386 err = bpf_map_update_elem(map_fd, pkey, &_val, BPF_ANY);
1387 break;
1388 }
1389 case 8: {
1390 err = bpf_map_update_elem(map_fd, pkey, &val, BPF_ANY);
1391 break;
1392 }
1393 default:
1394 pr_debug("ERROR: invalid value size\n");
1395 return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUESIZE;
1396 }
1397 if (err && errno)
1398 err = -errno;
1399 return err;
1400}
1401
1402static int
1403apply_config_evsel_for_key(const char *name, int map_fd, void *pkey,
1404 struct perf_evsel *evsel)
1405{
1406 struct xyarray *xy = evsel->fd;
1407 struct perf_event_attr *attr;
1408 unsigned int key, events;
1409 bool check_pass = false;
1410 int *evt_fd;
1411 int err;
1412
1413 if (!xy) {
1414 pr_debug("ERROR: evsel not ready for map %s\n", name);
1415 return -BPF_LOADER_ERRNO__INTERNAL;
1416 }
1417
1418 if (xy->row_size / xy->entry_size != 1) {
1419 pr_debug("ERROR: Dimension of target event is incorrect for map %s\n",
1420 name);
1421 return -BPF_LOADER_ERRNO__OBJCONF_MAP_EVTDIM;
1422 }
1423
1424 attr = &evsel->attr;
1425 if (attr->inherit) {
1426 pr_debug("ERROR: Can't put inherit event into map %s\n", name);
1427 return -BPF_LOADER_ERRNO__OBJCONF_MAP_EVTINH;
1428 }
1429
1430 if (perf_evsel__is_bpf_output(evsel))
1431 check_pass = true;
1432 if (attr->type == PERF_TYPE_RAW)
1433 check_pass = true;
1434 if (attr->type == PERF_TYPE_HARDWARE)
1435 check_pass = true;
1436 if (!check_pass) {
1437 pr_debug("ERROR: Event type is wrong for map %s\n", name);
1438 return -BPF_LOADER_ERRNO__OBJCONF_MAP_EVTTYPE;
1439 }
1440
1441 events = xy->entries / (xy->row_size / xy->entry_size);
1442 key = *((unsigned int *)pkey);
1443 if (key >= events) {
1444 pr_debug("ERROR: there is no event %d for map %s\n",
1445 key, name);
1446 return -BPF_LOADER_ERRNO__OBJCONF_MAP_MAPSIZE;
1447 }
1448 evt_fd = xyarray__entry(xy, key, 0);
1449 err = bpf_map_update_elem(map_fd, pkey, evt_fd, BPF_ANY);
1450 if (err && errno)
1451 err = -errno;
1452 return err;
1453}
1454
1455static int
1456apply_obj_config_map_for_key(const char *name, int map_fd,
1457 const struct bpf_map_def *pdef,
1458 struct bpf_map_op *op,
1459 void *pkey, void *arg __maybe_unused)
1460{
1461 int err;
1462
1463 switch (op->op_type) {
1464 case BPF_MAP_OP_SET_VALUE:
1465 err = apply_config_value_for_key(map_fd, pkey,
1466 pdef->value_size,
1467 op->v.value);
1468 break;
1469 case BPF_MAP_OP_SET_EVSEL:
1470 err = apply_config_evsel_for_key(name, map_fd, pkey,
1471 op->v.evsel);
1472 break;
1473 default:
1474 pr_debug("ERROR: unknown value type for '%s'\n", name);
1475 err = -BPF_LOADER_ERRNO__INTERNAL;
1476 }
1477 return err;
1478}
1479
1480static int
1481apply_obj_config_map(struct bpf_map *map)
1482{
1483 return bpf_map_config_foreach_key(map,
1484 apply_obj_config_map_for_key,
1485 NULL);
1486}
1487
1488static int
1489apply_obj_config_object(struct bpf_object *obj)
1490{
1491 struct bpf_map *map;
1492 int err;
1493
1494 bpf_object__for_each_map(map, obj) {
1495 err = apply_obj_config_map(map);
1496 if (err)
1497 return err;
1498 }
1499 return 0;
1500}
1501
1502int bpf__apply_obj_config(void)
1503{
1504 struct bpf_object *obj, *tmp;
1505 int err;
1506
1507 bpf_object__for_each_safe(obj, tmp) {
1508 err = apply_obj_config_object(obj);
1509 if (err)
1510 return err;
1511 }
1512
1513 return 0;
1514}
1515
1516#define bpf__for_each_map(pos, obj, objtmp) \
1517 bpf_object__for_each_safe(obj, objtmp) \
1518 bpf_object__for_each_map(pos, obj)
1519
1520#define bpf__for_each_map_named(pos, obj, objtmp, name) \
1521 bpf__for_each_map(pos, obj, objtmp) \
1522 if (bpf_map__name(pos) && \
1523 (strcmp(name, \
1524 bpf_map__name(pos)) == 0))
1525
1526struct perf_evsel *bpf__setup_output_event(struct perf_evlist *evlist, const char *name)
1527{
1528 struct bpf_map_priv *tmpl_priv = NULL;
1529 struct bpf_object *obj, *tmp;
1530 struct perf_evsel *evsel = NULL;
1531 struct bpf_map *map;
1532 int err;
1533 bool need_init = false;
1534
1535 bpf__for_each_map_named(map, obj, tmp, name) {
1536 struct bpf_map_priv *priv = bpf_map__priv(map);
1537
1538 if (IS_ERR(priv))
1539 return ERR_PTR(-BPF_LOADER_ERRNO__INTERNAL);
1540
1541
1542
1543
1544
1545 if (!need_init && !priv)
1546 need_init = !priv;
1547 if (!tmpl_priv && priv)
1548 tmpl_priv = priv;
1549 }
1550
1551 if (!need_init)
1552 return NULL;
1553
1554 if (!tmpl_priv) {
1555 char *event_definition = NULL;
1556
1557 if (asprintf(&event_definition, "bpf-output/no-inherit=1,name=%s/", name) < 0)
1558 return ERR_PTR(-ENOMEM);
1559
1560 err = parse_events(evlist, event_definition, NULL);
1561 free(event_definition);
1562
1563 if (err) {
1564 pr_debug("ERROR: failed to create the \"%s\" bpf-output event\n", name);
1565 return ERR_PTR(-err);
1566 }
1567
1568 evsel = perf_evlist__last(evlist);
1569 }
1570
1571 bpf__for_each_map_named(map, obj, tmp, name) {
1572 struct bpf_map_priv *priv = bpf_map__priv(map);
1573
1574 if (IS_ERR(priv))
1575 return ERR_PTR(-BPF_LOADER_ERRNO__INTERNAL);
1576 if (priv)
1577 continue;
1578
1579 if (tmpl_priv) {
1580 priv = bpf_map_priv__clone(tmpl_priv);
1581 if (!priv)
1582 return ERR_PTR(-ENOMEM);
1583
1584 err = bpf_map__set_priv(map, priv, bpf_map_priv__clear);
1585 if (err) {
1586 bpf_map_priv__clear(map, priv);
1587 return ERR_PTR(err);
1588 }
1589 } else if (evsel) {
1590 struct bpf_map_op *op;
1591
1592 op = bpf_map__add_newop(map, NULL);
1593 if (IS_ERR(op))
1594 return ERR_CAST(op);
1595 op->op_type = BPF_MAP_OP_SET_EVSEL;
1596 op->v.evsel = evsel;
1597 }
1598 }
1599
1600 return evsel;
1601}
1602
1603int bpf__setup_stdout(struct perf_evlist *evlist)
1604{
1605 struct perf_evsel *evsel = bpf__setup_output_event(evlist, "__bpf_stdout__");
1606 return PTR_ERR_OR_ZERO(evsel);
1607}
1608
1609#define ERRNO_OFFSET(e) ((e) - __BPF_LOADER_ERRNO__START)
1610#define ERRCODE_OFFSET(c) ERRNO_OFFSET(BPF_LOADER_ERRNO__##c)
1611#define NR_ERRNO (__BPF_LOADER_ERRNO__END - __BPF_LOADER_ERRNO__START)
1612
1613static const char *bpf_loader_strerror_table[NR_ERRNO] = {
1614 [ERRCODE_OFFSET(CONFIG)] = "Invalid config string",
1615 [ERRCODE_OFFSET(GROUP)] = "Invalid group name",
1616 [ERRCODE_OFFSET(EVENTNAME)] = "No event name found in config string",
1617 [ERRCODE_OFFSET(INTERNAL)] = "BPF loader internal error",
1618 [ERRCODE_OFFSET(COMPILE)] = "Error when compiling BPF scriptlet",
1619 [ERRCODE_OFFSET(PROGCONF_TERM)] = "Invalid program config term in config string",
1620 [ERRCODE_OFFSET(PROLOGUE)] = "Failed to generate prologue",
1621 [ERRCODE_OFFSET(PROLOGUE2BIG)] = "Prologue too big for program",
1622 [ERRCODE_OFFSET(PROLOGUEOOB)] = "Offset out of bound for prologue",
1623 [ERRCODE_OFFSET(OBJCONF_OPT)] = "Invalid object config option",
1624 [ERRCODE_OFFSET(OBJCONF_CONF)] = "Config value not set (missing '=')",
1625 [ERRCODE_OFFSET(OBJCONF_MAP_OPT)] = "Invalid object map config option",
1626 [ERRCODE_OFFSET(OBJCONF_MAP_NOTEXIST)] = "Target map doesn't exist",
1627 [ERRCODE_OFFSET(OBJCONF_MAP_VALUE)] = "Incorrect value type for map",
1628 [ERRCODE_OFFSET(OBJCONF_MAP_TYPE)] = "Incorrect map type",
1629 [ERRCODE_OFFSET(OBJCONF_MAP_KEYSIZE)] = "Incorrect map key size",
1630 [ERRCODE_OFFSET(OBJCONF_MAP_VALUESIZE)] = "Incorrect map value size",
1631 [ERRCODE_OFFSET(OBJCONF_MAP_NOEVT)] = "Event not found for map setting",
1632 [ERRCODE_OFFSET(OBJCONF_MAP_MAPSIZE)] = "Invalid map size for event setting",
1633 [ERRCODE_OFFSET(OBJCONF_MAP_EVTDIM)] = "Event dimension too large",
1634 [ERRCODE_OFFSET(OBJCONF_MAP_EVTINH)] = "Doesn't support inherit event",
1635 [ERRCODE_OFFSET(OBJCONF_MAP_EVTTYPE)] = "Wrong event type for map",
1636 [ERRCODE_OFFSET(OBJCONF_MAP_IDX2BIG)] = "Index too large",
1637};
1638
1639static int
1640bpf_loader_strerror(int err, char *buf, size_t size)
1641{
1642 char sbuf[STRERR_BUFSIZE];
1643 const char *msg;
1644
1645 if (!buf || !size)
1646 return -1;
1647
1648 err = err > 0 ? err : -err;
1649
1650 if (err >= __LIBBPF_ERRNO__START)
1651 return libbpf_strerror(err, buf, size);
1652
1653 if (err >= __BPF_LOADER_ERRNO__START && err < __BPF_LOADER_ERRNO__END) {
1654 msg = bpf_loader_strerror_table[ERRNO_OFFSET(err)];
1655 snprintf(buf, size, "%s", msg);
1656 buf[size - 1] = '\0';
1657 return 0;
1658 }
1659
1660 if (err >= __BPF_LOADER_ERRNO__END)
1661 snprintf(buf, size, "Unknown bpf loader error %d", err);
1662 else
1663 snprintf(buf, size, "%s",
1664 str_error_r(err, sbuf, sizeof(sbuf)));
1665
1666 buf[size - 1] = '\0';
1667 return -1;
1668}
1669
1670#define bpf__strerror_head(err, buf, size) \
1671 char sbuf[STRERR_BUFSIZE], *emsg;\
1672 if (!size)\
1673 return 0;\
1674 if (err < 0)\
1675 err = -err;\
1676 bpf_loader_strerror(err, sbuf, sizeof(sbuf));\
1677 emsg = sbuf;\
1678 switch (err) {\
1679 default:\
1680 scnprintf(buf, size, "%s", emsg);\
1681 break;
1682
1683#define bpf__strerror_entry(val, fmt...)\
1684 case val: {\
1685 scnprintf(buf, size, fmt);\
1686 break;\
1687 }
1688
1689#define bpf__strerror_end(buf, size)\
1690 }\
1691 buf[size - 1] = '\0';
1692
1693int bpf__strerror_prepare_load(const char *filename, bool source,
1694 int err, char *buf, size_t size)
1695{
1696 size_t n;
1697 int ret;
1698
1699 n = snprintf(buf, size, "Failed to load %s%s: ",
1700 filename, source ? " from source" : "");
1701 if (n >= size) {
1702 buf[size - 1] = '\0';
1703 return 0;
1704 }
1705 buf += n;
1706 size -= n;
1707
1708 ret = bpf_loader_strerror(err, buf, size);
1709 buf[size - 1] = '\0';
1710 return ret;
1711}
1712
1713int bpf__strerror_probe(struct bpf_object *obj __maybe_unused,
1714 int err, char *buf, size_t size)
1715{
1716 bpf__strerror_head(err, buf, size);
1717 case BPF_LOADER_ERRNO__PROGCONF_TERM: {
1718 scnprintf(buf, size, "%s (add -v to see detail)", emsg);
1719 break;
1720 }
1721 bpf__strerror_entry(EEXIST, "Probe point exist. Try 'perf probe -d \"*\"' and set 'force=yes'");
1722 bpf__strerror_entry(EACCES, "You need to be root");
1723 bpf__strerror_entry(EPERM, "You need to be root, and /proc/sys/kernel/kptr_restrict should be 0");
1724 bpf__strerror_entry(ENOENT, "You need to check probing points in BPF file");
1725 bpf__strerror_end(buf, size);
1726 return 0;
1727}
1728
1729int bpf__strerror_load(struct bpf_object *obj,
1730 int err, char *buf, size_t size)
1731{
1732 bpf__strerror_head(err, buf, size);
1733 case LIBBPF_ERRNO__KVER: {
1734 unsigned int obj_kver = bpf_object__kversion(obj);
1735 unsigned int real_kver;
1736
1737 if (fetch_kernel_version(&real_kver, NULL, 0)) {
1738 scnprintf(buf, size, "Unable to fetch kernel version");
1739 break;
1740 }
1741
1742 if (obj_kver != real_kver) {
1743 scnprintf(buf, size,
1744 "'version' ("KVER_FMT") doesn't match running kernel ("KVER_FMT")",
1745 KVER_PARAM(obj_kver),
1746 KVER_PARAM(real_kver));
1747 break;
1748 }
1749
1750 scnprintf(buf, size, "Failed to load program for unknown reason");
1751 break;
1752 }
1753 bpf__strerror_end(buf, size);
1754 return 0;
1755}
1756
1757int bpf__strerror_config_obj(struct bpf_object *obj __maybe_unused,
1758 struct parse_events_term *term __maybe_unused,
1759 struct perf_evlist *evlist __maybe_unused,
1760 int *error_pos __maybe_unused, int err,
1761 char *buf, size_t size)
1762{
1763 bpf__strerror_head(err, buf, size);
1764 bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE,
1765 "Can't use this config term with this map type");
1766 bpf__strerror_end(buf, size);
1767 return 0;
1768}
1769
1770int bpf__strerror_apply_obj_config(int err, char *buf, size_t size)
1771{
1772 bpf__strerror_head(err, buf, size);
1773 bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_EVTDIM,
1774 "Cannot set event to BPF map in multi-thread tracing");
1775 bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_EVTINH,
1776 "%s (Hint: use -i to turn off inherit)", emsg);
1777 bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_EVTTYPE,
1778 "Can only put raw, hardware and BPF output event into a BPF map");
1779 bpf__strerror_end(buf, size);
1780 return 0;
1781}
1782
1783int bpf__strerror_setup_output_event(struct perf_evlist *evlist __maybe_unused,
1784 int err, char *buf, size_t size)
1785{
1786 bpf__strerror_head(err, buf, size);
1787 bpf__strerror_end(buf, size);
1788 return 0;
1789}
1790
