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