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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) \
24static 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
35DEFINE_PRINT_FN(warning, 1)
36DEFINE_PRINT_FN(info, 1)
37DEFINE_PRINT_FN(debug, 1)
38
39struct bpf_prog_priv {
40 struct perf_probe_event pev;
41 bool need_prologue;
42 struct bpf_insn *insns_buf;
43 int nr_types;
44 int *type_mapping;
45};
46
47static bool libbpf_initialized;
48
49struct bpf_object *
50bpf__prepare_load_buffer(void *obj_buf, size_t obj_buf_sz, const char *name)
51{
52 struct bpf_object *obj;
53
54 if (!libbpf_initialized) {
55 libbpf_set_print(libbpf_warning,
56 libbpf_info,
57 libbpf_debug);
58 libbpf_initialized = true;
59 }
60
61 obj = bpf_object__open_buffer(obj_buf, obj_buf_sz, name);
62 if (IS_ERR(obj)) {
63 pr_debug("bpf: failed to load buffer\n");
64 return ERR_PTR(-EINVAL);
65 }
66
67 return obj;
68}
69
70struct bpf_object *bpf__prepare_load(const char *filename, bool source)
71{
72 struct bpf_object *obj;
73
74 if (!libbpf_initialized) {
75 libbpf_set_print(libbpf_warning,
76 libbpf_info,
77 libbpf_debug);
78 libbpf_initialized = true;
79 }
80
81 if (source) {
82 int err;
83 void *obj_buf;
84 size_t obj_buf_sz;
85
86 err = llvm__compile_bpf(filename, &obj_buf, &obj_buf_sz);
87 if (err)
88 return ERR_PTR(-BPF_LOADER_ERRNO__COMPILE);
89 obj = bpf_object__open_buffer(obj_buf, obj_buf_sz, filename);
90 free(obj_buf);
91 } else
92 obj = bpf_object__open(filename);
93
94 if (IS_ERR(obj)) {
95 pr_debug("bpf: failed to load %s\n", filename);
96 return obj;
97 }
98
99 return obj;
100}
101
102void bpf__clear(void)
103{
104 struct bpf_object *obj, *tmp;
105
106 bpf_object__for_each_safe(obj, tmp) {
107 bpf__unprobe(obj);
108 bpf_object__close(obj);
109 }
110}
111
112static void
113clear_prog_priv(struct bpf_program *prog __maybe_unused,
114 void *_priv)
115{
116 struct bpf_prog_priv *priv = _priv;
117
118 cleanup_perf_probe_events(&priv->pev, 1);
119 zfree(&priv->insns_buf);
120 zfree(&priv->type_mapping);
121 free(priv);
122}
123
124static int
125prog_config__exec(const char *value, struct perf_probe_event *pev)
126{
127 pev->uprobes = true;
128 pev->target = strdup(value);
129 if (!pev->target)
130 return -ENOMEM;
131 return 0;
132}
133
134static int
135prog_config__module(const char *value, struct perf_probe_event *pev)
136{
137 pev->uprobes = false;
138 pev->target = strdup(value);
139 if (!pev->target)
140 return -ENOMEM;
141 return 0;
142}
143
144static int
145prog_config__bool(const char *value, bool *pbool, bool invert)
146{
147 int err;
148 bool bool_value;
149
150 if (!pbool)
151 return -EINVAL;
152
153 err = strtobool(value, &bool_value);
154 if (err)
155 return err;
156
157 *pbool = invert ? !bool_value : bool_value;
158 return 0;
159}
160
161static int
162prog_config__inlines(const char *value,
163 struct perf_probe_event *pev __maybe_unused)
164{
165 return prog_config__bool(value, &probe_conf.no_inlines, true);
166}
167
168static int
169prog_config__force(const char *value,
170 struct perf_probe_event *pev __maybe_unused)
171{
172 return prog_config__bool(value, &probe_conf.force_add, false);
173}
174
175static struct {
176 const char *key;
177 const char *usage;
178 const char *desc;
179 int (*func)(const char *, struct perf_probe_event *);
180} bpf_prog_config_terms[] = {
181 {
182 .key = "exec",
183 .usage = "exec=<full path of file>",
184 .desc = "Set uprobe target",
185 .func = prog_config__exec,
186 },
187 {
188 .key = "module",
189 .usage = "module=<module name> ",
190 .desc = "Set kprobe module",
191 .func = prog_config__module,
192 },
193 {
194 .key = "inlines",
195 .usage = "inlines=[yes|no] ",
196 .desc = "Probe at inline symbol",
197 .func = prog_config__inlines,
198 },
199 {
200 .key = "force",
201 .usage = "force=[yes|no] ",
202 .desc = "Forcibly add events with existing name",
203 .func = prog_config__force,
204 },
205};
206
207static int
208do_prog_config(const char *key, const char *value,
209 struct perf_probe_event *pev)
210{
211 unsigned int i;
212
213 pr_debug("config bpf program: %s=%s\n", key, value);
214 for (i = 0; i < ARRAY_SIZE(bpf_prog_config_terms); i++)
215 if (strcmp(key, bpf_prog_config_terms[i].key) == 0)
216 return bpf_prog_config_terms[i].func(value, pev);
217
218 pr_debug("BPF: ERROR: invalid program config option: %s=%s\n",
219 key, value);
220
221 pr_debug("\nHint: Valid options are:\n");
222 for (i = 0; i < ARRAY_SIZE(bpf_prog_config_terms); i++)
223 pr_debug("\t%s:\t%s\n", bpf_prog_config_terms[i].usage,
224 bpf_prog_config_terms[i].desc);
225 pr_debug("\n");
226
227 return -BPF_LOADER_ERRNO__PROGCONF_TERM;
228}
229
230static const char *
231parse_prog_config_kvpair(const char *config_str, struct perf_probe_event *pev)
232{
233 char *text = strdup(config_str);
234 char *sep, *line;
235 const char *main_str = NULL;
236 int err = 0;
237
238 if (!text) {
239 pr_debug("No enough memory: dup config_str failed\n");
240 return ERR_PTR(-ENOMEM);
241 }
242
243 line = text;
244 while ((sep = strchr(line, ';'))) {
245 char *equ;
246
247 *sep = '\0';
248 equ = strchr(line, '=');
249 if (!equ) {
250 pr_warning("WARNING: invalid config in BPF object: %s\n",
251 line);
252 pr_warning("\tShould be 'key=value'.\n");
253 goto nextline;
254 }
255 *equ = '\0';
256
257 err = do_prog_config(line, equ + 1, pev);
258 if (err)
259 break;
260nextline:
261 line = sep + 1;
262 }
263
264 if (!err)
265 main_str = config_str + (line - text);
266 free(text);
267
268 return err ? ERR_PTR(err) : main_str;
269}
270
271static int
272parse_prog_config(const char *config_str, struct perf_probe_event *pev)
273{
274 int err;
275 const char *main_str = parse_prog_config_kvpair(config_str, pev);
276
277 if (IS_ERR(main_str))
278 return PTR_ERR(main_str);
279
280 err = parse_perf_probe_command(main_str, pev);
281 if (err < 0) {
282 pr_debug("bpf: '%s' is not a valid config string\n",
283 config_str);
284 /* parse failed, don't need clear pev. */
285 return -BPF_LOADER_ERRNO__CONFIG;
286 }
287 return 0;
288}
289
290static int
291config_bpf_program(struct bpf_program *prog)
292{
293 struct perf_probe_event *pev = NULL;
294 struct bpf_prog_priv *priv = NULL;
295 const char *config_str;
296 int err;
297
298 /* Initialize per-program probing setting */
299 probe_conf.no_inlines = false;
300 probe_conf.force_add = false;
301
302 config_str = bpf_program__title(prog, false);
303 if (IS_ERR(config_str)) {
304 pr_debug("bpf: unable to get title for program\n");
305 return PTR_ERR(config_str);
306 }
307
308 priv = calloc(sizeof(*priv), 1);
309 if (!priv) {
310 pr_debug("bpf: failed to alloc priv\n");
311 return -ENOMEM;
312 }
313 pev = &priv->pev;
314
315 pr_debug("bpf: config program '%s'\n", config_str);
316 err = parse_prog_config(config_str, pev);
317 if (err)
318 goto errout;
319
320 if (pev->group && strcmp(pev->group, PERF_BPF_PROBE_GROUP)) {
321 pr_debug("bpf: '%s': group for event is set and not '%s'.\n",
322 config_str, PERF_BPF_PROBE_GROUP);
323 err = -BPF_LOADER_ERRNO__GROUP;
324 goto errout;
325 } else if (!pev->group)
326 pev->group = strdup(PERF_BPF_PROBE_GROUP);
327
328 if (!pev->group) {
329 pr_debug("bpf: strdup failed\n");
330 err = -ENOMEM;
331 goto errout;
332 }
333
334 if (!pev->event) {
335 pr_debug("bpf: '%s': event name is missing. Section name should be 'key=value'\n",
336 config_str);
337 err = -BPF_LOADER_ERRNO__EVENTNAME;
338 goto errout;
339 }
340 pr_debug("bpf: config '%s' is ok\n", config_str);
341
342 err = bpf_program__set_private(prog, priv, clear_prog_priv);
343 if (err) {
344 pr_debug("Failed to set priv for program '%s'\n", config_str);
345 goto errout;
346 }
347
348 return 0;
349
350errout:
351 if (pev)
352 clear_perf_probe_event(pev);
353 free(priv);
354 return err;
355}
356
357static int bpf__prepare_probe(void)
358{
359 static int err = 0;
360 static bool initialized = false;
361
362 /*
363 * Make err static, so if init failed the first, bpf__prepare_probe()
364 * fails each time without calling init_probe_symbol_maps multiple
365 * times.
366 */
367 if (initialized)
368 return err;
369
370 initialized = true;
371 err = init_probe_symbol_maps(false);
372 if (err < 0)
373 pr_debug("Failed to init_probe_symbol_maps\n");
374 probe_conf.max_probes = MAX_PROBES;
375 return err;
376}
377
378static int
379preproc_gen_prologue(struct bpf_program *prog, int n,
380 struct bpf_insn *orig_insns, int orig_insns_cnt,
381 struct bpf_prog_prep_result *res)
382{
383 struct probe_trace_event *tev;
384 struct perf_probe_event *pev;
385 struct bpf_prog_priv *priv;
386 struct bpf_insn *buf;
387 size_t prologue_cnt = 0;
388 int i, err;
389
390 err = bpf_program__get_private(prog, (void **)&priv);
391 if (err || !priv)
392 goto errout;
393
394 pev = &priv->pev;
395
396 if (n < 0 || n >= priv->nr_types)
397 goto errout;
398
399 /* Find a tev belongs to that type */
400 for (i = 0; i < pev->ntevs; i++) {
401 if (priv->type_mapping[i] == n)
402 break;
403 }
404
405 if (i >= pev->ntevs) {
406 pr_debug("Internal error: prologue type %d not found\n", n);
407 return -BPF_LOADER_ERRNO__PROLOGUE;
408 }
409
410 tev = &pev->tevs[i];
411
412 buf = priv->insns_buf;
413 err = bpf__gen_prologue(tev->args, tev->nargs,
414 buf, &prologue_cnt,
415 BPF_MAXINSNS - orig_insns_cnt);
416 if (err) {
417 const char *title;
418
419 title = bpf_program__title(prog, false);
420 if (!title)
421 title = "[unknown]";
422
423 pr_debug("Failed to generate prologue for program %s\n",
424 title);
425 return err;
426 }
427
428 memcpy(&buf[prologue_cnt], orig_insns,
429 sizeof(struct bpf_insn) * orig_insns_cnt);
430
431 res->new_insn_ptr = buf;
432 res->new_insn_cnt = prologue_cnt + orig_insns_cnt;
433 res->pfd = NULL;
434 return 0;
435
436errout:
437 pr_debug("Internal error in preproc_gen_prologue\n");
438 return -BPF_LOADER_ERRNO__PROLOGUE;
439}
440
441/*
442 * compare_tev_args is reflexive, transitive and antisymmetric.
443 * I can proof it but this margin is too narrow to contain.
444 */
445static int compare_tev_args(const void *ptev1, const void *ptev2)
446{
447 int i, ret;
448 const struct probe_trace_event *tev1 =
449 *(const struct probe_trace_event **)ptev1;
450 const struct probe_trace_event *tev2 =
451 *(const struct probe_trace_event **)ptev2;
452
453 ret = tev2->nargs - tev1->nargs;
454 if (ret)
455 return ret;
456
457 for (i = 0; i < tev1->nargs; i++) {
458 struct probe_trace_arg *arg1, *arg2;
459 struct probe_trace_arg_ref *ref1, *ref2;
460
461 arg1 = &tev1->args[i];
462 arg2 = &tev2->args[i];
463
464 ret = strcmp(arg1->value, arg2->value);
465 if (ret)
466 return ret;
467
468 ref1 = arg1->ref;
469 ref2 = arg2->ref;
470
471 while (ref1 && ref2) {
472 ret = ref2->offset - ref1->offset;
473 if (ret)
474 return ret;
475
476 ref1 = ref1->next;
477 ref2 = ref2->next;
478 }
479
480 if (ref1 || ref2)
481 return ref2 ? 1 : -1;
482 }
483
484 return 0;
485}
486
487/*
488 * Assign a type number to each tevs in a pev.
489 * mapping is an array with same slots as tevs in that pev.
490 * nr_types will be set to number of types.
491 */
492static int map_prologue(struct perf_probe_event *pev, int *mapping,
493 int *nr_types)
494{
495 int i, type = 0;
496 struct probe_trace_event **ptevs;
497
498 size_t array_sz = sizeof(*ptevs) * pev->ntevs;
499
500 ptevs = malloc(array_sz);
501 if (!ptevs) {
502 pr_debug("No ehough memory: alloc ptevs failed\n");
503 return -ENOMEM;
504 }
505
506 pr_debug("In map_prologue, ntevs=%d\n", pev->ntevs);
507 for (i = 0; i < pev->ntevs; i++)
508 ptevs[i] = &pev->tevs[i];
509
510 qsort(ptevs, pev->ntevs, sizeof(*ptevs),
511 compare_tev_args);
512
513 for (i = 0; i < pev->ntevs; i++) {
514 int n;
515
516 n = ptevs[i] - pev->tevs;
517 if (i == 0) {
518 mapping[n] = type;
519 pr_debug("mapping[%d]=%d\n", n, type);
520 continue;
521 }
522
523 if (compare_tev_args(ptevs + i, ptevs + i - 1) == 0)
524 mapping[n] = type;
525 else
526 mapping[n] = ++type;
527
528 pr_debug("mapping[%d]=%d\n", n, mapping[n]);
529 }
530 free(ptevs);
531 *nr_types = type + 1;
532
533 return 0;
534}
535
536static int hook_load_preprocessor(struct bpf_program *prog)
537{
538 struct perf_probe_event *pev;
539 struct bpf_prog_priv *priv;
540 bool need_prologue = false;
541 int err, i;
542
543 err = bpf_program__get_private(prog, (void **)&priv);
544 if (err || !priv) {
545 pr_debug("Internal error when hook preprocessor\n");
546 return -BPF_LOADER_ERRNO__INTERNAL;
547 }
548
549 pev = &priv->pev;
550 for (i = 0; i < pev->ntevs; i++) {
551 struct probe_trace_event *tev = &pev->tevs[i];
552
553 if (tev->nargs > 0) {
554 need_prologue = true;
555 break;
556 }
557 }
558
559 /*
560 * Since all tevs don't have argument, we don't need generate
561 * prologue.
562 */
563 if (!need_prologue) {
564 priv->need_prologue = false;
565 return 0;
566 }
567
568 priv->need_prologue = true;
569 priv->insns_buf = malloc(sizeof(struct bpf_insn) * BPF_MAXINSNS);
570 if (!priv->insns_buf) {
571 pr_debug("No enough memory: alloc insns_buf failed\n");
572 return -ENOMEM;
573 }
574
575 priv->type_mapping = malloc(sizeof(int) * pev->ntevs);
576 if (!priv->type_mapping) {
577 pr_debug("No enough memory: alloc type_mapping failed\n");
578 return -ENOMEM;
579 }
580 memset(priv->type_mapping, -1,
581 sizeof(int) * pev->ntevs);
582
583 err = map_prologue(pev, priv->type_mapping, &priv->nr_types);
584 if (err)
585 return err;
586
587 err = bpf_program__set_prep(prog, priv->nr_types,
588 preproc_gen_prologue);
589 return err;
590}
591
592int bpf__probe(struct bpf_object *obj)
593{
594 int err = 0;
595 struct bpf_program *prog;
596 struct bpf_prog_priv *priv;
597 struct perf_probe_event *pev;
598
599 err = bpf__prepare_probe();
600 if (err) {
601 pr_debug("bpf__prepare_probe failed\n");
602 return err;
603 }
604
605 bpf_object__for_each_program(prog, obj) {
606 err = config_bpf_program(prog);
607 if (err)
608 goto out;
609
610 err = bpf_program__get_private(prog, (void **)&priv);
611 if (err || !priv)
612 goto out;
613 pev = &priv->pev;
614
615 err = convert_perf_probe_events(pev, 1);
616 if (err < 0) {
617 pr_debug("bpf_probe: failed to convert perf probe events");
618 goto out;
619 }
620
621 err = apply_perf_probe_events(pev, 1);
622 if (err < 0) {
623 pr_debug("bpf_probe: failed to apply perf probe events");
624 goto out;
625 }
626
627 /*
628 * After probing, let's consider prologue, which
629 * adds program fetcher to BPF programs.
630 *
631 * hook_load_preprocessorr() hooks pre-processor
632 * to bpf_program, let it generate prologue
633 * dynamically during loading.
634 */
635 err = hook_load_preprocessor(prog);
636 if (err)
637 goto out;
638 }
639out:
640 return err < 0 ? err : 0;
641}
642
643#define EVENTS_WRITE_BUFSIZE 4096
644int bpf__unprobe(struct bpf_object *obj)
645{
646 int err, ret = 0;
647 struct bpf_program *prog;
648 struct bpf_prog_priv *priv;
649
650 bpf_object__for_each_program(prog, obj) {
651 int i;
652
653 err = bpf_program__get_private(prog, (void **)&priv);
654 if (err || !priv)
655 continue;
656
657 for (i = 0; i < priv->pev.ntevs; i++) {
658 struct probe_trace_event *tev = &priv->pev.tevs[i];
659 char name_buf[EVENTS_WRITE_BUFSIZE];
660 struct strfilter *delfilter;
661
662 snprintf(name_buf, EVENTS_WRITE_BUFSIZE,
663 "%s:%s", tev->group, tev->event);
664 name_buf[EVENTS_WRITE_BUFSIZE - 1] = '\0';
665
666 delfilter = strfilter__new(name_buf, NULL);
667 if (!delfilter) {
668 pr_debug("Failed to create filter for unprobing\n");
669 ret = -ENOMEM;
670 continue;
671 }
672
673 err = del_perf_probe_events(delfilter);
674 strfilter__delete(delfilter);
675 if (err) {
676 pr_debug("Failed to delete %s\n", name_buf);
677 ret = err;
678 continue;
679 }
680 }
681 }
682 return ret;
683}
684
685int bpf__load(struct bpf_object *obj)
686{
687 int err;
688
689 err = bpf_object__load(obj);
690 if (err) {
691 pr_debug("bpf: load objects failed\n");
692 return err;
693 }
694 return 0;
695}
696
697int bpf__foreach_tev(struct bpf_object *obj,
698 bpf_prog_iter_callback_t func,
699 void *arg)
700{
701 struct bpf_program *prog;
702 int err;
703
704 bpf_object__for_each_program(prog, obj) {
705 struct probe_trace_event *tev;
706 struct perf_probe_event *pev;
707 struct bpf_prog_priv *priv;
708 int i, fd;
709
710 err = bpf_program__get_private(prog,
711 (void **)&priv);
712 if (err || !priv) {
713 pr_debug("bpf: failed to get private field\n");
714 return -BPF_LOADER_ERRNO__INTERNAL;
715 }
716
717 pev = &priv->pev;
718 for (i = 0; i < pev->ntevs; i++) {
719 tev = &pev->tevs[i];
720
721 if (priv->need_prologue) {
722 int type = priv->type_mapping[i];
723
724 fd = bpf_program__nth_fd(prog, type);
725 } else {
726 fd = bpf_program__fd(prog);
727 }
728
729 if (fd < 0) {
730 pr_debug("bpf: failed to get file descriptor\n");
731 return fd;
732 }
733
734 err = (*func)(tev, fd, arg);
735 if (err) {
736 pr_debug("bpf: call back failed, stop iterate\n");
737 return err;
738 }
739 }
740 }
741 return 0;
742}
743
744enum bpf_map_op_type {
745 BPF_MAP_OP_SET_VALUE,
746 BPF_MAP_OP_SET_EVSEL,
747};
748
749enum bpf_map_key_type {
750 BPF_MAP_KEY_ALL,
751 BPF_MAP_KEY_RANGES,
752};
753
754struct bpf_map_op {
755 struct list_head list;
756 enum bpf_map_op_type op_type;
757 enum bpf_map_key_type key_type;
758 union {
759 struct parse_events_array array;
760 } k;
761 union {
762 u64 value;
763 struct perf_evsel *evsel;
764 } v;
765};
766
767struct bpf_map_priv {
768 struct list_head ops_list;
769};
770
771static void
772bpf_map_op__delete(struct bpf_map_op *op)
773{
774 if (!list_empty(&op->list))
775 list_del(&op->list);
776 if (op->key_type == BPF_MAP_KEY_RANGES)
777 parse_events__clear_array(&op->k.array);
778 free(op);
779}
780
781static void
782bpf_map_priv__purge(struct bpf_map_priv *priv)
783{
784 struct bpf_map_op *pos, *n;
785
786 list_for_each_entry_safe(pos, n, &priv->ops_list, list) {
787 list_del_init(&pos->list);
788 bpf_map_op__delete(pos);
789 }
790}
791
792static void
793bpf_map_priv__clear(struct bpf_map *map __maybe_unused,
794 void *_priv)
795{
796 struct bpf_map_priv *priv = _priv;
797
798 bpf_map_priv__purge(priv);
799 free(priv);
800}
801
802static int
803bpf_map_op_setkey(struct bpf_map_op *op, struct parse_events_term *term)
804{
805 op->key_type = BPF_MAP_KEY_ALL;
806 if (!term)
807 return 0;
808
809 if (term->array.nr_ranges) {
810 size_t memsz = term->array.nr_ranges *
811 sizeof(op->k.array.ranges[0]);
812
813 op->k.array.ranges = memdup(term->array.ranges, memsz);
814 if (!op->k.array.ranges) {
815 pr_debug("No enough memory to alloc indices for map\n");
816 return -ENOMEM;
817 }
818 op->key_type = BPF_MAP_KEY_RANGES;
819 op->k.array.nr_ranges = term->array.nr_ranges;
820 }
821 return 0;
822}
823
824static struct bpf_map_op *
825bpf_map_op__new(struct parse_events_term *term)
826{
827 struct bpf_map_op *op;
828 int err;
829
830 op = zalloc(sizeof(*op));
831 if (!op) {
832 pr_debug("Failed to alloc bpf_map_op\n");
833 return ERR_PTR(-ENOMEM);
834 }
835 INIT_LIST_HEAD(&op->list);
836
837 err = bpf_map_op_setkey(op, term);
838 if (err) {
839 free(op);
840 return ERR_PTR(err);
841 }
842 return op;
843}
844
845static int
846bpf_map__add_op(struct bpf_map *map, struct bpf_map_op *op)
847{
848 struct bpf_map_priv *priv;
849 const char *map_name;
850 int err;
851
852 map_name = bpf_map__get_name(map);
853 err = bpf_map__get_private(map, (void **)&priv);
854 if (err) {
855 pr_debug("Failed to get private from map %s\n", map_name);
856 return err;
857 }
858
859 if (!priv) {
860 priv = zalloc(sizeof(*priv));
861 if (!priv) {
862 pr_debug("No enough memory to alloc map private\n");
863 return -ENOMEM;
864 }
865 INIT_LIST_HEAD(&priv->ops_list);
866
867 if (bpf_map__set_private(map, priv, bpf_map_priv__clear)) {
868 free(priv);
869 return -BPF_LOADER_ERRNO__INTERNAL;
870 }
871 }
872
873 list_add_tail(&op->list, &priv->ops_list);
874 return 0;
875}
876
877static struct bpf_map_op *
878bpf_map__add_newop(struct bpf_map *map, struct parse_events_term *term)
879{
880 struct bpf_map_op *op;
881 int err;
882
883 op = bpf_map_op__new(term);
884 if (IS_ERR(op))
885 return op;
886
887 err = bpf_map__add_op(map, op);
888 if (err) {
889 bpf_map_op__delete(op);
890 return ERR_PTR(err);
891 }
892 return op;
893}
894
895static int
896__bpf_map__config_value(struct bpf_map *map,
897 struct parse_events_term *term)
898{
899 struct bpf_map_def def;
900 struct bpf_map_op *op;
901 const char *map_name;
902 int err;
903
904 map_name = bpf_map__get_name(map);
905
906 err = bpf_map__get_def(map, &def);
907 if (err) {
908 pr_debug("Unable to get map definition from '%s'\n",
909 map_name);
910 return -BPF_LOADER_ERRNO__INTERNAL;
911 }
912
913 if (def.type != BPF_MAP_TYPE_ARRAY) {
914 pr_debug("Map %s type is not BPF_MAP_TYPE_ARRAY\n",
915 map_name);
916 return -BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE;
917 }
918 if (def.key_size < sizeof(unsigned int)) {
919 pr_debug("Map %s has incorrect key size\n", map_name);
920 return -BPF_LOADER_ERRNO__OBJCONF_MAP_KEYSIZE;
921 }
922 switch (def.value_size) {
923 case 1:
924 case 2:
925 case 4:
926 case 8:
927 break;
928 default:
929 pr_debug("Map %s has incorrect value size\n", map_name);
930 return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUESIZE;
931 }
932
933 op = bpf_map__add_newop(map, term);
934 if (IS_ERR(op))
935 return PTR_ERR(op);
936 op->op_type = BPF_MAP_OP_SET_VALUE;
937 op->v.value = term->val.num;
938 return 0;
939}
940
941static int
942bpf_map__config_value(struct bpf_map *map,
943 struct parse_events_term *term,
944 struct perf_evlist *evlist __maybe_unused)
945{
946 if (!term->err_val) {
947 pr_debug("Config value not set\n");
948 return -BPF_LOADER_ERRNO__OBJCONF_CONF;
949 }
950
951 if (term->type_val != PARSE_EVENTS__TERM_TYPE_NUM) {
952 pr_debug("ERROR: wrong value type for 'value'\n");
953 return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUE;
954 }
955
956 return __bpf_map__config_value(map, term);
957}
958
959static int
960__bpf_map__config_event(struct bpf_map *map,
961 struct parse_events_term *term,
962 struct perf_evlist *evlist)
963{
964 struct perf_evsel *evsel;
965 struct bpf_map_def def;
966 struct bpf_map_op *op;
967 const char *map_name;
968 int err;
969
970 map_name = bpf_map__get_name(map);
971 evsel = perf_evlist__find_evsel_by_str(evlist, term->val.str);
972 if (!evsel) {
973 pr_debug("Event (for '%s') '%s' doesn't exist\n",
974 map_name, term->val.str);
975 return -BPF_LOADER_ERRNO__OBJCONF_MAP_NOEVT;
976 }
977
978 err = bpf_map__get_def(map, &def);
979 if (err) {
980 pr_debug("Unable to get map definition from '%s'\n",
981 map_name);
982 return err;
983 }
984
985 /*
986 * No need to check key_size and value_size:
987 * kernel has already checked them.
988 */
989 if (def.type != BPF_MAP_TYPE_PERF_EVENT_ARRAY) {
990 pr_debug("Map %s type is not BPF_MAP_TYPE_PERF_EVENT_ARRAY\n",
991 map_name);
992 return -BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE;
993 }
994
995 op = bpf_map__add_newop(map, term);
996 if (IS_ERR(op))
997 return PTR_ERR(op);
998 op->op_type = BPF_MAP_OP_SET_EVSEL;
999 op->v.evsel = evsel;
1000 return 0;
1001}
1002
1003static int
1004bpf_map__config_event(struct bpf_map *map,
1005 struct parse_events_term *term,
1006 struct perf_evlist *evlist)
1007{
1008 if (!term->err_val) {
1009 pr_debug("Config value not set\n");
1010 return -BPF_LOADER_ERRNO__OBJCONF_CONF;
1011 }
1012
1013 if (term->type_val != PARSE_EVENTS__TERM_TYPE_STR) {
1014 pr_debug("ERROR: wrong value type for 'event'\n");
1015 return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUE;
1016 }
1017
1018 return __bpf_map__config_event(map, term, evlist);
1019}
1020
1021struct bpf_obj_config__map_func {
1022 const char *config_opt;
1023 int (*config_func)(struct bpf_map *, struct parse_events_term *,
1024 struct perf_evlist *);
1025};
1026
1027struct bpf_obj_config__map_func bpf_obj_config__map_funcs[] = {
1028 {"value", bpf_map__config_value},
1029 {"event", bpf_map__config_event},
1030};
1031
1032static int
1033config_map_indices_range_check(struct parse_events_term *term,
1034 struct bpf_map *map,
1035 const char *map_name)
1036{
1037 struct parse_events_array *array = &term->array;
1038 struct bpf_map_def def;
1039 unsigned int i;
1040 int err;
1041
1042 if (!array->nr_ranges)
1043 return 0;
1044 if (!array->ranges) {
1045 pr_debug("ERROR: map %s: array->nr_ranges is %d but range array is NULL\n",
1046 map_name, (int)array->nr_ranges);
1047 return -BPF_LOADER_ERRNO__INTERNAL;
1048 }
1049
1050 err = bpf_map__get_def(map, &def);
1051 if (err) {
1052 pr_debug("ERROR: Unable to get map definition from '%s'\n",
1053 map_name);
1054 return -BPF_LOADER_ERRNO__INTERNAL;
1055 }
1056
1057 for (i = 0; i < array->nr_ranges; i++) {
1058 unsigned int start = array->ranges[i].start;
1059 size_t length = array->ranges[i].length;
1060 unsigned int idx = start + length - 1;
1061
1062 if (idx >= def.max_entries) {
1063 pr_debug("ERROR: index %d too large\n", idx);
1064 return -BPF_LOADER_ERRNO__OBJCONF_MAP_IDX2BIG;
1065 }
1066 }
1067 return 0;
1068}
1069
1070static int
1071bpf__obj_config_map(struct bpf_object *obj,
1072 struct parse_events_term *term,
1073 struct perf_evlist *evlist,
1074 int *key_scan_pos)
1075{
1076 /* key is "map:<mapname>.<config opt>" */
1077 char *map_name = strdup(term->config + sizeof("map:") - 1);
1078 struct bpf_map *map;
1079 int err = -BPF_LOADER_ERRNO__OBJCONF_OPT;
1080 char *map_opt;
1081 size_t i;
1082
1083 if (!map_name)
1084 return -ENOMEM;
1085
1086 map_opt = strchr(map_name, '.');
1087 if (!map_opt) {
1088 pr_debug("ERROR: Invalid map config: %s\n", map_name);
1089 goto out;
1090 }
1091
1092 *map_opt++ = '\0';
1093 if (*map_opt == '\0') {
1094 pr_debug("ERROR: Invalid map option: %s\n", term->config);
1095 goto out;
1096 }
1097
1098 map = bpf_object__get_map_by_name(obj, map_name);
1099 if (!map) {
1100 pr_debug("ERROR: Map %s doesn't exist\n", map_name);
1101 err = -BPF_LOADER_ERRNO__OBJCONF_MAP_NOTEXIST;
1102 goto out;
1103 }
1104
1105 *key_scan_pos += strlen(map_opt);
1106 err = config_map_indices_range_check(term, map, map_name);
1107 if (err)
1108 goto out;
1109 *key_scan_pos -= strlen(map_opt);
1110
1111 for (i = 0; i < ARRAY_SIZE(bpf_obj_config__map_funcs); i++) {
1112 struct bpf_obj_config__map_func *func =
1113 &bpf_obj_config__map_funcs[i];
1114
1115 if (strcmp(map_opt, func->config_opt) == 0) {
1116 err = func->config_func(map, term, evlist);
1117 goto out;
1118 }
1119 }
1120
1121 pr_debug("ERROR: Invalid map config option '%s'\n", map_opt);
1122 err = -BPF_LOADER_ERRNO__OBJCONF_MAP_OPT;
1123out:
1124 free(map_name);
1125 if (!err)
1126 key_scan_pos += strlen(map_opt);
1127 return err;
1128}
1129
1130int bpf__config_obj(struct bpf_object *obj,
1131 struct parse_events_term *term,
1132 struct perf_evlist *evlist,
1133 int *error_pos)
1134{
1135 int key_scan_pos = 0;
1136 int err;
1137
1138 if (!obj || !term || !term->config)
1139 return -EINVAL;
1140
1141 if (!prefixcmp(term->config, "map:")) {
1142 key_scan_pos = sizeof("map:") - 1;
1143 err = bpf__obj_config_map(obj, term, evlist, &key_scan_pos);
1144 goto out;
1145 }
1146 err = -BPF_LOADER_ERRNO__OBJCONF_OPT;
1147out:
1148 if (error_pos)
1149 *error_pos = key_scan_pos;
1150 return err;
1151
1152}
1153
1154typedef int (*map_config_func_t)(const char *name, int map_fd,
1155 struct bpf_map_def *pdef,
1156 struct bpf_map_op *op,
1157 void *pkey, void *arg);
1158
1159static int
1160foreach_key_array_all(map_config_func_t func,
1161 void *arg, const char *name,
1162 int map_fd, struct bpf_map_def *pdef,
1163 struct bpf_map_op *op)
1164{
1165 unsigned int i;
1166 int err;
1167
1168 for (i = 0; i < pdef->max_entries; i++) {
1169 err = func(name, map_fd, pdef, op, &i, arg);
1170 if (err) {
1171 pr_debug("ERROR: failed to insert value to %s[%u]\n",
1172 name, i);
1173 return err;
1174 }
1175 }
1176 return 0;
1177}
1178
1179static int
1180foreach_key_array_ranges(map_config_func_t func, void *arg,
1181 const char *name, int map_fd,
1182 struct bpf_map_def *pdef,
1183 struct bpf_map_op *op)
1184{
1185 unsigned int i, j;
1186 int err;
1187
1188 for (i = 0; i < op->k.array.nr_ranges; i++) {
1189 unsigned int start = op->k.array.ranges[i].start;
1190 size_t length = op->k.array.ranges[i].length;
1191
1192 for (j = 0; j < length; j++) {
1193 unsigned int idx = start + j;
1194
1195 err = func(name, map_fd, pdef, op, &idx, arg);
1196 if (err) {
1197 pr_debug("ERROR: failed to insert value to %s[%u]\n",
1198 name, idx);
1199 return err;
1200 }
1201 }
1202 }
1203 return 0;
1204}
1205
1206static int
1207bpf_map_config_foreach_key(struct bpf_map *map,
1208 map_config_func_t func,
1209 void *arg)
1210{
1211 int err, map_fd;
1212 const char *name;
1213 struct bpf_map_op *op;
1214 struct bpf_map_def def;
1215 struct bpf_map_priv *priv;
1216
1217 name = bpf_map__get_name(map);
1218
1219 err = bpf_map__get_private(map, (void **)&priv);
1220 if (err) {
1221 pr_debug("ERROR: failed to get private from map %s\n", name);
1222 return -BPF_LOADER_ERRNO__INTERNAL;
1223 }
1224 if (!priv || list_empty(&priv->ops_list)) {
1225 pr_debug("INFO: nothing to config for map %s\n", name);
1226 return 0;
1227 }
1228
1229 err = bpf_map__get_def(map, &def);
1230 if (err) {
1231 pr_debug("ERROR: failed to get definition from map %s\n", name);
1232 return -BPF_LOADER_ERRNO__INTERNAL;
1233 }
1234 map_fd = bpf_map__get_fd(map);
1235 if (map_fd < 0) {
1236 pr_debug("ERROR: failed to get fd from map %s\n", name);
1237 return map_fd;
1238 }
1239
1240 list_for_each_entry(op, &priv->ops_list, list) {
1241 switch (def.type) {
1242 case BPF_MAP_TYPE_ARRAY:
1243 case BPF_MAP_TYPE_PERF_EVENT_ARRAY:
1244 switch (op->key_type) {
1245 case BPF_MAP_KEY_ALL:
1246 err = foreach_key_array_all(func, arg, name,
1247 map_fd, &def, op);
1248 break;
1249 case BPF_MAP_KEY_RANGES:
1250 err = foreach_key_array_ranges(func, arg, name,
1251 map_fd, &def,
1252 op);
1253 break;
1254 default:
1255 pr_debug("ERROR: keytype for map '%s' invalid\n",
1256 name);
1257 return -BPF_LOADER_ERRNO__INTERNAL;
1258 }
1259 if (err)
1260 return err;
1261 break;
1262 default:
1263 pr_debug("ERROR: type of '%s' incorrect\n", name);
1264 return -BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE;
1265 }
1266 }
1267
1268 return 0;
1269}
1270
1271static int
1272apply_config_value_for_key(int map_fd, void *pkey,
1273 size_t val_size, u64 val)
1274{
1275 int err = 0;
1276
1277 switch (val_size) {
1278 case 1: {
1279 u8 _val = (u8)(val);
1280 err = bpf_map_update_elem(map_fd, pkey, &_val, BPF_ANY);
1281 break;
1282 }
1283 case 2: {
1284 u16 _val = (u16)(val);
1285 err = bpf_map_update_elem(map_fd, pkey, &_val, BPF_ANY);
1286 break;
1287 }
1288 case 4: {
1289 u32 _val = (u32)(val);
1290 err = bpf_map_update_elem(map_fd, pkey, &_val, BPF_ANY);
1291 break;
1292 }
1293 case 8: {
1294 err = bpf_map_update_elem(map_fd, pkey, &val, BPF_ANY);
1295 break;
1296 }
1297 default:
1298 pr_debug("ERROR: invalid value size\n");
1299 return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUESIZE;
1300 }
1301 if (err && errno)
1302 err = -errno;
1303 return err;
1304}
1305
1306static int
1307apply_config_evsel_for_key(const char *name, int map_fd, void *pkey,
1308 struct perf_evsel *evsel)
1309{
1310 struct xyarray *xy = evsel->fd;
1311 struct perf_event_attr *attr;
1312 unsigned int key, events;
1313 bool check_pass = false;
1314 int *evt_fd;
1315 int err;
1316
1317 if (!xy) {
1318 pr_debug("ERROR: evsel not ready for map %s\n", name);
1319 return -BPF_LOADER_ERRNO__INTERNAL;
1320 }
1321
1322 if (xy->row_size / xy->entry_size != 1) {
1323 pr_debug("ERROR: Dimension of target event is incorrect for map %s\n",
1324 name);
1325 return -BPF_LOADER_ERRNO__OBJCONF_MAP_EVTDIM;
1326 }
1327
1328 attr = &evsel->attr;
1329 if (attr->inherit) {
1330 pr_debug("ERROR: Can't put inherit event into map %s\n", name);
1331 return -BPF_LOADER_ERRNO__OBJCONF_MAP_EVTINH;
1332 }
1333
1334 if (perf_evsel__is_bpf_output(evsel))
1335 check_pass = true;
1336 if (attr->type == PERF_TYPE_RAW)
1337 check_pass = true;
1338 if (attr->type == PERF_TYPE_HARDWARE)
1339 check_pass = true;
1340 if (!check_pass) {
1341 pr_debug("ERROR: Event type is wrong for map %s\n", name);
1342 return -BPF_LOADER_ERRNO__OBJCONF_MAP_EVTTYPE;
1343 }
1344
1345 events = xy->entries / (xy->row_size / xy->entry_size);
1346 key = *((unsigned int *)pkey);
1347 if (key >= events) {
1348 pr_debug("ERROR: there is no event %d for map %s\n",
1349 key, name);
1350 return -BPF_LOADER_ERRNO__OBJCONF_MAP_MAPSIZE;
1351 }
1352 evt_fd = xyarray__entry(xy, key, 0);
1353 err = bpf_map_update_elem(map_fd, pkey, evt_fd, BPF_ANY);
1354 if (err && errno)
1355 err = -errno;
1356 return err;
1357}
1358
1359static int
1360apply_obj_config_map_for_key(const char *name, int map_fd,
1361 struct bpf_map_def *pdef __maybe_unused,
1362 struct bpf_map_op *op,
1363 void *pkey, void *arg __maybe_unused)
1364{
1365 int err;
1366
1367 switch (op->op_type) {
1368 case BPF_MAP_OP_SET_VALUE:
1369 err = apply_config_value_for_key(map_fd, pkey,
1370 pdef->value_size,
1371 op->v.value);
1372 break;
1373 case BPF_MAP_OP_SET_EVSEL:
1374 err = apply_config_evsel_for_key(name, map_fd, pkey,
1375 op->v.evsel);
1376 break;
1377 default:
1378 pr_debug("ERROR: unknown value type for '%s'\n", name);
1379 err = -BPF_LOADER_ERRNO__INTERNAL;
1380 }
1381 return err;
1382}
1383
1384static int
1385apply_obj_config_map(struct bpf_map *map)
1386{
1387 return bpf_map_config_foreach_key(map,
1388 apply_obj_config_map_for_key,
1389 NULL);
1390}
1391
1392static int
1393apply_obj_config_object(struct bpf_object *obj)
1394{
1395 struct bpf_map *map;
1396 int err;
1397
1398 bpf_map__for_each(map, obj) {
1399 err = apply_obj_config_map(map);
1400 if (err)
1401 return err;
1402 }
1403 return 0;
1404}
1405
1406int bpf__apply_obj_config(void)
1407{
1408 struct bpf_object *obj, *tmp;
1409 int err;
1410
1411 bpf_object__for_each_safe(obj, tmp) {
1412 err = apply_obj_config_object(obj);
1413 if (err)
1414 return err;
1415 }
1416
1417 return 0;
1418}
1419
1420#define ERRNO_OFFSET(e) ((e) - __BPF_LOADER_ERRNO__START)
1421#define ERRCODE_OFFSET(c) ERRNO_OFFSET(BPF_LOADER_ERRNO__##c)
1422#define NR_ERRNO (__BPF_LOADER_ERRNO__END - __BPF_LOADER_ERRNO__START)
1423
1424static const char *bpf_loader_strerror_table[NR_ERRNO] = {
1425 [ERRCODE_OFFSET(CONFIG)] = "Invalid config string",
1426 [ERRCODE_OFFSET(GROUP)] = "Invalid group name",
1427 [ERRCODE_OFFSET(EVENTNAME)] = "No event name found in config string",
1428 [ERRCODE_OFFSET(INTERNAL)] = "BPF loader internal error",
1429 [ERRCODE_OFFSET(COMPILE)] = "Error when compiling BPF scriptlet",
1430 [ERRCODE_OFFSET(PROGCONF_TERM)] = "Invalid program config term in config string",
1431 [ERRCODE_OFFSET(PROLOGUE)] = "Failed to generate prologue",
1432 [ERRCODE_OFFSET(PROLOGUE2BIG)] = "Prologue too big for program",
1433 [ERRCODE_OFFSET(PROLOGUEOOB)] = "Offset out of bound for prologue",
1434 [ERRCODE_OFFSET(OBJCONF_OPT)] = "Invalid object config option",
1435 [ERRCODE_OFFSET(OBJCONF_CONF)] = "Config value not set (missing '=')",
1436 [ERRCODE_OFFSET(OBJCONF_MAP_OPT)] = "Invalid object map config option",
1437 [ERRCODE_OFFSET(OBJCONF_MAP_NOTEXIST)] = "Target map doesn't exist",
1438 [ERRCODE_OFFSET(OBJCONF_MAP_VALUE)] = "Incorrect value type for map",
1439 [ERRCODE_OFFSET(OBJCONF_MAP_TYPE)] = "Incorrect map type",
1440 [ERRCODE_OFFSET(OBJCONF_MAP_KEYSIZE)] = "Incorrect map key size",
1441 [ERRCODE_OFFSET(OBJCONF_MAP_VALUESIZE)] = "Incorrect map value size",
1442 [ERRCODE_OFFSET(OBJCONF_MAP_NOEVT)] = "Event not found for map setting",
1443 [ERRCODE_OFFSET(OBJCONF_MAP_MAPSIZE)] = "Invalid map size for event setting",
1444 [ERRCODE_OFFSET(OBJCONF_MAP_EVTDIM)] = "Event dimension too large",
1445 [ERRCODE_OFFSET(OBJCONF_MAP_EVTINH)] = "Doesn't support inherit event",
1446 [ERRCODE_OFFSET(OBJCONF_MAP_EVTTYPE)] = "Wrong event type for map",
1447 [ERRCODE_OFFSET(OBJCONF_MAP_IDX2BIG)] = "Index too large",
1448};
1449
1450static int
1451bpf_loader_strerror(int err, char *buf, size_t size)
1452{
1453 char sbuf[STRERR_BUFSIZE];
1454 const char *msg;
1455
1456 if (!buf || !size)
1457 return -1;
1458
1459 err = err > 0 ? err : -err;
1460
1461 if (err >= __LIBBPF_ERRNO__START)
1462 return libbpf_strerror(err, buf, size);
1463
1464 if (err >= __BPF_LOADER_ERRNO__START && err < __BPF_LOADER_ERRNO__END) {
1465 msg = bpf_loader_strerror_table[ERRNO_OFFSET(err)];
1466 snprintf(buf, size, "%s", msg);
1467 buf[size - 1] = '\0';
1468 return 0;
1469 }
1470
1471 if (err >= __BPF_LOADER_ERRNO__END)
1472 snprintf(buf, size, "Unknown bpf loader error %d", err);
1473 else
1474 snprintf(buf, size, "%s",
1475 strerror_r(err, sbuf, sizeof(sbuf)));
1476
1477 buf[size - 1] = '\0';
1478 return -1;
1479}
1480
1481#define bpf__strerror_head(err, buf, size) \
1482 char sbuf[STRERR_BUFSIZE], *emsg;\
1483 if (!size)\
1484 return 0;\
1485 if (err < 0)\
1486 err = -err;\
1487 bpf_loader_strerror(err, sbuf, sizeof(sbuf));\
1488 emsg = sbuf;\
1489 switch (err) {\
1490 default:\
1491 scnprintf(buf, size, "%s", emsg);\
1492 break;
1493
1494#define bpf__strerror_entry(val, fmt...)\
1495 case val: {\
1496 scnprintf(buf, size, fmt);\
1497 break;\
1498 }
1499
1500#define bpf__strerror_end(buf, size)\
1501 }\
1502 buf[size - 1] = '\0';
1503
1504int bpf__strerror_prepare_load(const char *filename, bool source,
1505 int err, char *buf, size_t size)
1506{
1507 size_t n;
1508 int ret;
1509
1510 n = snprintf(buf, size, "Failed to load %s%s: ",
1511 filename, source ? " from source" : "");
1512 if (n >= size) {
1513 buf[size - 1] = '\0';
1514 return 0;
1515 }
1516 buf += n;
1517 size -= n;
1518
1519 ret = bpf_loader_strerror(err, buf, size);
1520 buf[size - 1] = '\0';
1521 return ret;
1522}
1523
1524int bpf__strerror_probe(struct bpf_object *obj __maybe_unused,
1525 int err, char *buf, size_t size)
1526{
1527 bpf__strerror_head(err, buf, size);
1528 case BPF_LOADER_ERRNO__PROGCONF_TERM: {
1529 scnprintf(buf, size, "%s (add -v to see detail)", emsg);
1530 break;
1531 }
1532 bpf__strerror_entry(EEXIST, "Probe point exist. Try 'perf probe -d \"*\"' and set 'force=yes'");
1533 bpf__strerror_entry(EACCES, "You need to be root");
1534 bpf__strerror_entry(EPERM, "You need to be root, and /proc/sys/kernel/kptr_restrict should be 0");
1535 bpf__strerror_entry(ENOENT, "You need to check probing points in BPF file");
1536 bpf__strerror_end(buf, size);
1537 return 0;
1538}
1539
1540int bpf__strerror_load(struct bpf_object *obj,
1541 int err, char *buf, size_t size)
1542{
1543 bpf__strerror_head(err, buf, size);
1544 case LIBBPF_ERRNO__KVER: {
1545 unsigned int obj_kver = bpf_object__get_kversion(obj);
1546 unsigned int real_kver;
1547
1548 if (fetch_kernel_version(&real_kver, NULL, 0)) {
1549 scnprintf(buf, size, "Unable to fetch kernel version");
1550 break;
1551 }
1552
1553 if (obj_kver != real_kver) {
1554 scnprintf(buf, size,
1555 "'version' ("KVER_FMT") doesn't match running kernel ("KVER_FMT")",
1556 KVER_PARAM(obj_kver),
1557 KVER_PARAM(real_kver));
1558 break;
1559 }
1560
1561 scnprintf(buf, size, "Failed to load program for unknown reason");
1562 break;
1563 }
1564 bpf__strerror_end(buf, size);
1565 return 0;
1566}
1567
1568int bpf__strerror_config_obj(struct bpf_object *obj __maybe_unused,
1569 struct parse_events_term *term __maybe_unused,
1570 struct perf_evlist *evlist __maybe_unused,
1571 int *error_pos __maybe_unused, int err,
1572 char *buf, size_t size)
1573{
1574 bpf__strerror_head(err, buf, size);
1575 bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE,
1576 "Can't use this config term with this map type");
1577 bpf__strerror_end(buf, size);
1578 return 0;
1579}
1580
1581int bpf__strerror_apply_obj_config(int err, char *buf, size_t size)
1582{
1583 bpf__strerror_head(err, buf, size);
1584 bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_EVTDIM,
1585 "Cannot set event to BPF map in multi-thread tracing");
1586 bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_EVTINH,
1587 "%s (Hint: use -i to turn off inherit)", emsg);
1588 bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_EVTTYPE,
1589 "Can only put raw, hardware and BPF output event into a BPF map");
1590 bpf__strerror_end(buf, size);
1591 return 0;
1592}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * bpf-loader.c
4 *
5 * Copyright (C) 2015 Wang Nan <wangnan0@huawei.com>
6 * Copyright (C) 2015 Huawei Inc.
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 "bpf-loader.h"
19#include "bpf-prologue.h"
20#include "probe-event.h"
21#include "probe-finder.h" // for MAX_PROBES
22#include "parse-events.h"
23#include "strfilter.h"
24#include "llvm-utils.h"
25#include "c++/clang-c.h"
26
27#define DEFINE_PRINT_FN(name, level) \
28static int libbpf_##name(const char *fmt, ...) \
29{ \
30 va_list args; \
31 int ret; \
32 \
33 va_start(args, fmt); \
34 ret = veprintf(level, verbose, pr_fmt(fmt), args);\
35 va_end(args); \
36 return ret; \
37}
38
39DEFINE_PRINT_FN(warning, 1)
40DEFINE_PRINT_FN(info, 1)
41DEFINE_PRINT_FN(debug, 1)
42
43struct bpf_prog_priv {
44 bool is_tp;
45 char *sys_name;
46 char *evt_name;
47 struct perf_probe_event pev;
48 bool need_prologue;
49 struct bpf_insn *insns_buf;
50 int nr_types;
51 int *type_mapping;
52};
53
54static bool libbpf_initialized;
55
56struct bpf_object *
57bpf__prepare_load_buffer(void *obj_buf, size_t obj_buf_sz, const char *name)
58{
59 struct bpf_object *obj;
60
61 if (!libbpf_initialized) {
62 libbpf_set_print(libbpf_warning,
63 libbpf_info,
64 libbpf_debug);
65 libbpf_initialized = true;
66 }
67
68 obj = bpf_object__open_buffer(obj_buf, obj_buf_sz, name);
69 if (IS_ERR_OR_NULL(obj)) {
70 pr_debug("bpf: failed to load buffer\n");
71 return ERR_PTR(-EINVAL);
72 }
73
74 return obj;
75}
76
77struct bpf_object *bpf__prepare_load(const char *filename, bool source)
78{
79 struct bpf_object *obj;
80
81 if (!libbpf_initialized) {
82 libbpf_set_print(libbpf_warning,
83 libbpf_info,
84 libbpf_debug);
85 libbpf_initialized = true;
86 }
87
88 if (source) {
89 int err;
90 void *obj_buf;
91 size_t obj_buf_sz;
92
93 perf_clang__init();
94 err = perf_clang__compile_bpf(filename, &obj_buf, &obj_buf_sz);
95 perf_clang__cleanup();
96 if (err) {
97 pr_debug("bpf: builtin compilation failed: %d, try external compiler\n", err);
98 err = llvm__compile_bpf(filename, &obj_buf, &obj_buf_sz);
99 if (err)
100 return ERR_PTR(-BPF_LOADER_ERRNO__COMPILE);
101 } else
102 pr_debug("bpf: successfull builtin compilation\n");
103 obj = bpf_object__open_buffer(obj_buf, obj_buf_sz, filename);
104
105 if (!IS_ERR_OR_NULL(obj) && llvm_param.dump_obj)
106 llvm__dump_obj(filename, obj_buf, obj_buf_sz);
107
108 free(obj_buf);
109 } else
110 obj = bpf_object__open(filename);
111
112 if (IS_ERR_OR_NULL(obj)) {
113 pr_debug("bpf: failed to load %s\n", filename);
114 return obj;
115 }
116
117 return obj;
118}
119
120void bpf__clear(void)
121{
122 struct bpf_object *obj, *tmp;
123
124 bpf_object__for_each_safe(obj, tmp) {
125 bpf__unprobe(obj);
126 bpf_object__close(obj);
127 }
128}
129
130static void
131clear_prog_priv(struct bpf_program *prog __maybe_unused,
132 void *_priv)
133{
134 struct bpf_prog_priv *priv = _priv;
135
136 cleanup_perf_probe_events(&priv->pev, 1);
137 zfree(&priv->insns_buf);
138 zfree(&priv->type_mapping);
139 zfree(&priv->sys_name);
140 zfree(&priv->evt_name);
141 free(priv);
142}
143
144static int
145prog_config__exec(const char *value, struct perf_probe_event *pev)
146{
147 pev->uprobes = true;
148 pev->target = strdup(value);
149 if (!pev->target)
150 return -ENOMEM;
151 return 0;
152}
153
154static int
155prog_config__module(const char *value, struct perf_probe_event *pev)
156{
157 pev->uprobes = false;
158 pev->target = strdup(value);
159 if (!pev->target)
160 return -ENOMEM;
161 return 0;
162}
163
164static int
165prog_config__bool(const char *value, bool *pbool, bool invert)
166{
167 int err;
168 bool bool_value;
169
170 if (!pbool)
171 return -EINVAL;
172
173 err = strtobool(value, &bool_value);
174 if (err)
175 return err;
176
177 *pbool = invert ? !bool_value : bool_value;
178 return 0;
179}
180
181static int
182prog_config__inlines(const char *value,
183 struct perf_probe_event *pev __maybe_unused)
184{
185 return prog_config__bool(value, &probe_conf.no_inlines, true);
186}
187
188static int
189prog_config__force(const char *value,
190 struct perf_probe_event *pev __maybe_unused)
191{
192 return prog_config__bool(value, &probe_conf.force_add, false);
193}
194
195static struct {
196 const char *key;
197 const char *usage;
198 const char *desc;
199 int (*func)(const char *, struct perf_probe_event *);
200} bpf_prog_config_terms[] = {
201 {
202 .key = "exec",
203 .usage = "exec=<full path of file>",
204 .desc = "Set uprobe target",
205 .func = prog_config__exec,
206 },
207 {
208 .key = "module",
209 .usage = "module=<module name> ",
210 .desc = "Set kprobe module",
211 .func = prog_config__module,
212 },
213 {
214 .key = "inlines",
215 .usage = "inlines=[yes|no] ",
216 .desc = "Probe at inline symbol",
217 .func = prog_config__inlines,
218 },
219 {
220 .key = "force",
221 .usage = "force=[yes|no] ",
222 .desc = "Forcibly add events with existing name",
223 .func = prog_config__force,
224 },
225};
226
227static int
228do_prog_config(const char *key, const char *value,
229 struct perf_probe_event *pev)
230{
231 unsigned int i;
232
233 pr_debug("config bpf program: %s=%s\n", key, value);
234 for (i = 0; i < ARRAY_SIZE(bpf_prog_config_terms); i++)
235 if (strcmp(key, bpf_prog_config_terms[i].key) == 0)
236 return bpf_prog_config_terms[i].func(value, pev);
237
238 pr_debug("BPF: ERROR: invalid program config option: %s=%s\n",
239 key, value);
240
241 pr_debug("\nHint: Valid options are:\n");
242 for (i = 0; i < ARRAY_SIZE(bpf_prog_config_terms); i++)
243 pr_debug("\t%s:\t%s\n", bpf_prog_config_terms[i].usage,
244 bpf_prog_config_terms[i].desc);
245 pr_debug("\n");
246
247 return -BPF_LOADER_ERRNO__PROGCONF_TERM;
248}
249
250static const char *
251parse_prog_config_kvpair(const char *config_str, struct perf_probe_event *pev)
252{
253 char *text = strdup(config_str);
254 char *sep, *line;
255 const char *main_str = NULL;
256 int err = 0;
257
258 if (!text) {
259 pr_debug("Not enough memory: dup config_str failed\n");
260 return ERR_PTR(-ENOMEM);
261 }
262
263 line = text;
264 while ((sep = strchr(line, ';'))) {
265 char *equ;
266
267 *sep = '\0';
268 equ = strchr(line, '=');
269 if (!equ) {
270 pr_warning("WARNING: invalid config in BPF object: %s\n",
271 line);
272 pr_warning("\tShould be 'key=value'.\n");
273 goto nextline;
274 }
275 *equ = '\0';
276
277 err = do_prog_config(line, equ + 1, pev);
278 if (err)
279 break;
280nextline:
281 line = sep + 1;
282 }
283
284 if (!err)
285 main_str = config_str + (line - text);
286 free(text);
287
288 return err ? ERR_PTR(err) : main_str;
289}
290
291static int
292parse_prog_config(const char *config_str, const char **p_main_str,
293 bool *is_tp, struct perf_probe_event *pev)
294{
295 int err;
296 const char *main_str = parse_prog_config_kvpair(config_str, pev);
297
298 if (IS_ERR(main_str))
299 return PTR_ERR(main_str);
300
301 *p_main_str = main_str;
302 if (!strchr(main_str, '=')) {
303 /* Is a tracepoint event? */
304 const char *s = strchr(main_str, ':');
305
306 if (!s) {
307 pr_debug("bpf: '%s' is not a valid tracepoint\n",
308 config_str);
309 return -BPF_LOADER_ERRNO__CONFIG;
310 }
311
312 *is_tp = true;
313 return 0;
314 }
315
316 *is_tp = false;
317 err = parse_perf_probe_command(main_str, pev);
318 if (err < 0) {
319 pr_debug("bpf: '%s' is not a valid config string\n",
320 config_str);
321 /* parse failed, don't need clear pev. */
322 return -BPF_LOADER_ERRNO__CONFIG;
323 }
324 return 0;
325}
326
327static int
328config_bpf_program(struct bpf_program *prog)
329{
330 struct perf_probe_event *pev = NULL;
331 struct bpf_prog_priv *priv = NULL;
332 const char *config_str, *main_str;
333 bool is_tp = false;
334 int err;
335
336 /* Initialize per-program probing setting */
337 probe_conf.no_inlines = false;
338 probe_conf.force_add = false;
339
340 config_str = bpf_program__title(prog, false);
341 if (IS_ERR(config_str)) {
342 pr_debug("bpf: unable to get title for program\n");
343 return PTR_ERR(config_str);
344 }
345
346 priv = calloc(sizeof(*priv), 1);
347 if (!priv) {
348 pr_debug("bpf: failed to alloc priv\n");
349 return -ENOMEM;
350 }
351 pev = &priv->pev;
352
353 pr_debug("bpf: config program '%s'\n", config_str);
354 err = parse_prog_config(config_str, &main_str, &is_tp, pev);
355 if (err)
356 goto errout;
357
358 if (is_tp) {
359 char *s = strchr(main_str, ':');
360
361 priv->is_tp = true;
362 priv->sys_name = strndup(main_str, s - main_str);
363 priv->evt_name = strdup(s + 1);
364 goto set_priv;
365 }
366
367 if (pev->group && strcmp(pev->group, PERF_BPF_PROBE_GROUP)) {
368 pr_debug("bpf: '%s': group for event is set and not '%s'.\n",
369 config_str, PERF_BPF_PROBE_GROUP);
370 err = -BPF_LOADER_ERRNO__GROUP;
371 goto errout;
372 } else if (!pev->group)
373 pev->group = strdup(PERF_BPF_PROBE_GROUP);
374
375 if (!pev->group) {
376 pr_debug("bpf: strdup failed\n");
377 err = -ENOMEM;
378 goto errout;
379 }
380
381 if (!pev->event) {
382 pr_debug("bpf: '%s': event name is missing. Section name should be 'key=value'\n",
383 config_str);
384 err = -BPF_LOADER_ERRNO__EVENTNAME;
385 goto errout;
386 }
387 pr_debug("bpf: config '%s' is ok\n", config_str);
388
389set_priv:
390 err = bpf_program__set_priv(prog, priv, clear_prog_priv);
391 if (err) {
392 pr_debug("Failed to set priv for program '%s'\n", config_str);
393 goto errout;
394 }
395
396 return 0;
397
398errout:
399 if (pev)
400 clear_perf_probe_event(pev);
401 free(priv);
402 return err;
403}
404
405static int bpf__prepare_probe(void)
406{
407 static int err = 0;
408 static bool initialized = false;
409
410 /*
411 * Make err static, so if init failed the first, bpf__prepare_probe()
412 * fails each time without calling init_probe_symbol_maps multiple
413 * times.
414 */
415 if (initialized)
416 return err;
417
418 initialized = true;
419 err = init_probe_symbol_maps(false);
420 if (err < 0)
421 pr_debug("Failed to init_probe_symbol_maps\n");
422 probe_conf.max_probes = MAX_PROBES;
423 return err;
424}
425
426static int
427preproc_gen_prologue(struct bpf_program *prog, int n,
428 struct bpf_insn *orig_insns, int orig_insns_cnt,
429 struct bpf_prog_prep_result *res)
430{
431 struct bpf_prog_priv *priv = bpf_program__priv(prog);
432 struct probe_trace_event *tev;
433 struct perf_probe_event *pev;
434 struct bpf_insn *buf;
435 size_t prologue_cnt = 0;
436 int i, err;
437
438 if (IS_ERR(priv) || !priv || priv->is_tp)
439 goto errout;
440
441 pev = &priv->pev;
442
443 if (n < 0 || n >= priv->nr_types)
444 goto errout;
445
446 /* Find a tev belongs to that type */
447 for (i = 0; i < pev->ntevs; i++) {
448 if (priv->type_mapping[i] == n)
449 break;
450 }
451
452 if (i >= pev->ntevs) {
453 pr_debug("Internal error: prologue type %d not found\n", n);
454 return -BPF_LOADER_ERRNO__PROLOGUE;
455 }
456
457 tev = &pev->tevs[i];
458
459 buf = priv->insns_buf;
460 err = bpf__gen_prologue(tev->args, tev->nargs,
461 buf, &prologue_cnt,
462 BPF_MAXINSNS - orig_insns_cnt);
463 if (err) {
464 const char *title;
465
466 title = bpf_program__title(prog, false);
467 if (!title)
468 title = "[unknown]";
469
470 pr_debug("Failed to generate prologue for program %s\n",
471 title);
472 return err;
473 }
474
475 memcpy(&buf[prologue_cnt], orig_insns,
476 sizeof(struct bpf_insn) * orig_insns_cnt);
477
478 res->new_insn_ptr = buf;
479 res->new_insn_cnt = prologue_cnt + orig_insns_cnt;
480 res->pfd = NULL;
481 return 0;
482
483errout:
484 pr_debug("Internal error in preproc_gen_prologue\n");
485 return -BPF_LOADER_ERRNO__PROLOGUE;
486}
487
488/*
489 * compare_tev_args is reflexive, transitive and antisymmetric.
490 * I can proof it but this margin is too narrow to contain.
491 */
492static int compare_tev_args(const void *ptev1, const void *ptev2)
493{
494 int i, ret;
495 const struct probe_trace_event *tev1 =
496 *(const struct probe_trace_event **)ptev1;
497 const struct probe_trace_event *tev2 =
498 *(const struct probe_trace_event **)ptev2;
499
500 ret = tev2->nargs - tev1->nargs;
501 if (ret)
502 return ret;
503
504 for (i = 0; i < tev1->nargs; i++) {
505 struct probe_trace_arg *arg1, *arg2;
506 struct probe_trace_arg_ref *ref1, *ref2;
507
508 arg1 = &tev1->args[i];
509 arg2 = &tev2->args[i];
510
511 ret = strcmp(arg1->value, arg2->value);
512 if (ret)
513 return ret;
514
515 ref1 = arg1->ref;
516 ref2 = arg2->ref;
517
518 while (ref1 && ref2) {
519 ret = ref2->offset - ref1->offset;
520 if (ret)
521 return ret;
522
523 ref1 = ref1->next;
524 ref2 = ref2->next;
525 }
526
527 if (ref1 || ref2)
528 return ref2 ? 1 : -1;
529 }
530
531 return 0;
532}
533
534/*
535 * Assign a type number to each tevs in a pev.
536 * mapping is an array with same slots as tevs in that pev.
537 * nr_types will be set to number of types.
538 */
539static int map_prologue(struct perf_probe_event *pev, int *mapping,
540 int *nr_types)
541{
542 int i, type = 0;
543 struct probe_trace_event **ptevs;
544
545 size_t array_sz = sizeof(*ptevs) * pev->ntevs;
546
547 ptevs = malloc(array_sz);
548 if (!ptevs) {
549 pr_debug("Not enough memory: alloc ptevs failed\n");
550 return -ENOMEM;
551 }
552
553 pr_debug("In map_prologue, ntevs=%d\n", pev->ntevs);
554 for (i = 0; i < pev->ntevs; i++)
555 ptevs[i] = &pev->tevs[i];
556
557 qsort(ptevs, pev->ntevs, sizeof(*ptevs),
558 compare_tev_args);
559
560 for (i = 0; i < pev->ntevs; i++) {
561 int n;
562
563 n = ptevs[i] - pev->tevs;
564 if (i == 0) {
565 mapping[n] = type;
566 pr_debug("mapping[%d]=%d\n", n, type);
567 continue;
568 }
569
570 if (compare_tev_args(ptevs + i, ptevs + i - 1) == 0)
571 mapping[n] = type;
572 else
573 mapping[n] = ++type;
574
575 pr_debug("mapping[%d]=%d\n", n, mapping[n]);
576 }
577 free(ptevs);
578 *nr_types = type + 1;
579
580 return 0;
581}
582
583static int hook_load_preprocessor(struct bpf_program *prog)
584{
585 struct bpf_prog_priv *priv = bpf_program__priv(prog);
586 struct perf_probe_event *pev;
587 bool need_prologue = false;
588 int err, i;
589
590 if (IS_ERR(priv) || !priv) {
591 pr_debug("Internal error when hook preprocessor\n");
592 return -BPF_LOADER_ERRNO__INTERNAL;
593 }
594
595 if (priv->is_tp) {
596 priv->need_prologue = false;
597 return 0;
598 }
599
600 pev = &priv->pev;
601 for (i = 0; i < pev->ntevs; i++) {
602 struct probe_trace_event *tev = &pev->tevs[i];
603
604 if (tev->nargs > 0) {
605 need_prologue = true;
606 break;
607 }
608 }
609
610 /*
611 * Since all tevs don't have argument, we don't need generate
612 * prologue.
613 */
614 if (!need_prologue) {
615 priv->need_prologue = false;
616 return 0;
617 }
618
619 priv->need_prologue = true;
620 priv->insns_buf = malloc(sizeof(struct bpf_insn) * BPF_MAXINSNS);
621 if (!priv->insns_buf) {
622 pr_debug("Not enough memory: alloc insns_buf failed\n");
623 return -ENOMEM;
624 }
625
626 priv->type_mapping = malloc(sizeof(int) * pev->ntevs);
627 if (!priv->type_mapping) {
628 pr_debug("Not enough memory: alloc type_mapping failed\n");
629 return -ENOMEM;
630 }
631 memset(priv->type_mapping, -1,
632 sizeof(int) * pev->ntevs);
633
634 err = map_prologue(pev, priv->type_mapping, &priv->nr_types);
635 if (err)
636 return err;
637
638 err = bpf_program__set_prep(prog, priv->nr_types,
639 preproc_gen_prologue);
640 return err;
641}
642
643int bpf__probe(struct bpf_object *obj)
644{
645 int err = 0;
646 struct bpf_program *prog;
647 struct bpf_prog_priv *priv;
648 struct perf_probe_event *pev;
649
650 err = bpf__prepare_probe();
651 if (err) {
652 pr_debug("bpf__prepare_probe failed\n");
653 return err;
654 }
655
656 bpf_object__for_each_program(prog, obj) {
657 err = config_bpf_program(prog);
658 if (err)
659 goto out;
660
661 priv = bpf_program__priv(prog);
662 if (IS_ERR(priv) || !priv) {
663 err = PTR_ERR(priv);
664 goto out;
665 }
666
667 if (priv->is_tp) {
668 bpf_program__set_tracepoint(prog);
669 continue;
670 }
671
672 bpf_program__set_kprobe(prog);
673 pev = &priv->pev;
674
675 err = convert_perf_probe_events(pev, 1);
676 if (err < 0) {
677 pr_debug("bpf_probe: failed to convert perf probe events\n");
678 goto out;
679 }
680
681 err = apply_perf_probe_events(pev, 1);
682 if (err < 0) {
683 pr_debug("bpf_probe: failed to apply perf probe events\n");
684 goto out;
685 }
686
687 /*
688 * After probing, let's consider prologue, which
689 * adds program fetcher to BPF programs.
690 *
691 * hook_load_preprocessorr() hooks pre-processor
692 * to bpf_program, let it generate prologue
693 * dynamically during loading.
694 */
695 err = hook_load_preprocessor(prog);
696 if (err)
697 goto out;
698 }
699out:
700 return err < 0 ? err : 0;
701}
702
703#define EVENTS_WRITE_BUFSIZE 4096
704int bpf__unprobe(struct bpf_object *obj)
705{
706 int err, ret = 0;
707 struct bpf_program *prog;
708
709 bpf_object__for_each_program(prog, obj) {
710 struct bpf_prog_priv *priv = bpf_program__priv(prog);
711 int i;
712
713 if (IS_ERR(priv) || !priv || priv->is_tp)
714 continue;
715
716 for (i = 0; i < priv->pev.ntevs; i++) {
717 struct probe_trace_event *tev = &priv->pev.tevs[i];
718 char name_buf[EVENTS_WRITE_BUFSIZE];
719 struct strfilter *delfilter;
720
721 snprintf(name_buf, EVENTS_WRITE_BUFSIZE,
722 "%s:%s", tev->group, tev->event);
723 name_buf[EVENTS_WRITE_BUFSIZE - 1] = '\0';
724
725 delfilter = strfilter__new(name_buf, NULL);
726 if (!delfilter) {
727 pr_debug("Failed to create filter for unprobing\n");
728 ret = -ENOMEM;
729 continue;
730 }
731
732 err = del_perf_probe_events(delfilter);
733 strfilter__delete(delfilter);
734 if (err) {
735 pr_debug("Failed to delete %s\n", name_buf);
736 ret = err;
737 continue;
738 }
739 }
740 }
741 return ret;
742}
743
744int bpf__load(struct bpf_object *obj)
745{
746 int err;
747
748 err = bpf_object__load(obj);
749 if (err) {
750 pr_debug("bpf: load objects failed\n");
751 return err;
752 }
753 return 0;
754}
755
756int bpf__foreach_event(struct bpf_object *obj,
757 bpf_prog_iter_callback_t func,
758 void *arg)
759{
760 struct bpf_program *prog;
761 int err;
762
763 bpf_object__for_each_program(prog, obj) {
764 struct bpf_prog_priv *priv = bpf_program__priv(prog);
765 struct probe_trace_event *tev;
766 struct perf_probe_event *pev;
767 int i, fd;
768
769 if (IS_ERR(priv) || !priv) {
770 pr_debug("bpf: failed to get private field\n");
771 return -BPF_LOADER_ERRNO__INTERNAL;
772 }
773
774 if (priv->is_tp) {
775 fd = bpf_program__fd(prog);
776 err = (*func)(priv->sys_name, priv->evt_name, fd, arg);
777 if (err) {
778 pr_debug("bpf: tracepoint call back failed, stop iterate\n");
779 return err;
780 }
781 continue;
782 }
783
784 pev = &priv->pev;
785 for (i = 0; i < pev->ntevs; i++) {
786 tev = &pev->tevs[i];
787
788 if (priv->need_prologue) {
789 int type = priv->type_mapping[i];
790
791 fd = bpf_program__nth_fd(prog, type);
792 } else {
793 fd = bpf_program__fd(prog);
794 }
795
796 if (fd < 0) {
797 pr_debug("bpf: failed to get file descriptor\n");
798 return fd;
799 }
800
801 err = (*func)(tev->group, tev->event, fd, arg);
802 if (err) {
803 pr_debug("bpf: call back failed, stop iterate\n");
804 return err;
805 }
806 }
807 }
808 return 0;
809}
810
811enum bpf_map_op_type {
812 BPF_MAP_OP_SET_VALUE,
813 BPF_MAP_OP_SET_EVSEL,
814};
815
816enum bpf_map_key_type {
817 BPF_MAP_KEY_ALL,
818 BPF_MAP_KEY_RANGES,
819};
820
821struct bpf_map_op {
822 struct list_head list;
823 enum bpf_map_op_type op_type;
824 enum bpf_map_key_type key_type;
825 union {
826 struct parse_events_array array;
827 } k;
828 union {
829 u64 value;
830 struct perf_evsel *evsel;
831 } v;
832};
833
834struct bpf_map_priv {
835 struct list_head ops_list;
836};
837
838static void
839bpf_map_op__delete(struct bpf_map_op *op)
840{
841 if (!list_empty(&op->list))
842 list_del(&op->list);
843 if (op->key_type == BPF_MAP_KEY_RANGES)
844 parse_events__clear_array(&op->k.array);
845 free(op);
846}
847
848static void
849bpf_map_priv__purge(struct bpf_map_priv *priv)
850{
851 struct bpf_map_op *pos, *n;
852
853 list_for_each_entry_safe(pos, n, &priv->ops_list, list) {
854 list_del_init(&pos->list);
855 bpf_map_op__delete(pos);
856 }
857}
858
859static void
860bpf_map_priv__clear(struct bpf_map *map __maybe_unused,
861 void *_priv)
862{
863 struct bpf_map_priv *priv = _priv;
864
865 bpf_map_priv__purge(priv);
866 free(priv);
867}
868
869static int
870bpf_map_op_setkey(struct bpf_map_op *op, struct parse_events_term *term)
871{
872 op->key_type = BPF_MAP_KEY_ALL;
873 if (!term)
874 return 0;
875
876 if (term->array.nr_ranges) {
877 size_t memsz = term->array.nr_ranges *
878 sizeof(op->k.array.ranges[0]);
879
880 op->k.array.ranges = memdup(term->array.ranges, memsz);
881 if (!op->k.array.ranges) {
882 pr_debug("Not enough memory to alloc indices for map\n");
883 return -ENOMEM;
884 }
885 op->key_type = BPF_MAP_KEY_RANGES;
886 op->k.array.nr_ranges = term->array.nr_ranges;
887 }
888 return 0;
889}
890
891static struct bpf_map_op *
892bpf_map_op__new(struct parse_events_term *term)
893{
894 struct bpf_map_op *op;
895 int err;
896
897 op = zalloc(sizeof(*op));
898 if (!op) {
899 pr_debug("Failed to alloc bpf_map_op\n");
900 return ERR_PTR(-ENOMEM);
901 }
902 INIT_LIST_HEAD(&op->list);
903
904 err = bpf_map_op_setkey(op, term);
905 if (err) {
906 free(op);
907 return ERR_PTR(err);
908 }
909 return op;
910}
911
912static struct bpf_map_op *
913bpf_map_op__clone(struct bpf_map_op *op)
914{
915 struct bpf_map_op *newop;
916
917 newop = memdup(op, sizeof(*op));
918 if (!newop) {
919 pr_debug("Failed to alloc bpf_map_op\n");
920 return NULL;
921 }
922
923 INIT_LIST_HEAD(&newop->list);
924 if (op->key_type == BPF_MAP_KEY_RANGES) {
925 size_t memsz = op->k.array.nr_ranges *
926 sizeof(op->k.array.ranges[0]);
927
928 newop->k.array.ranges = memdup(op->k.array.ranges, memsz);
929 if (!newop->k.array.ranges) {
930 pr_debug("Failed to alloc indices for map\n");
931 free(newop);
932 return NULL;
933 }
934 }
935
936 return newop;
937}
938
939static struct bpf_map_priv *
940bpf_map_priv__clone(struct bpf_map_priv *priv)
941{
942 struct bpf_map_priv *newpriv;
943 struct bpf_map_op *pos, *newop;
944
945 newpriv = zalloc(sizeof(*newpriv));
946 if (!newpriv) {
947 pr_debug("Not enough memory to alloc map private\n");
948 return NULL;
949 }
950 INIT_LIST_HEAD(&newpriv->ops_list);
951
952 list_for_each_entry(pos, &priv->ops_list, list) {
953 newop = bpf_map_op__clone(pos);
954 if (!newop) {
955 bpf_map_priv__purge(newpriv);
956 return NULL;
957 }
958 list_add_tail(&newop->list, &newpriv->ops_list);
959 }
960
961 return newpriv;
962}
963
964static int
965bpf_map__add_op(struct bpf_map *map, struct bpf_map_op *op)
966{
967 const char *map_name = bpf_map__name(map);
968 struct bpf_map_priv *priv = bpf_map__priv(map);
969
970 if (IS_ERR(priv)) {
971 pr_debug("Failed to get private from map %s\n", map_name);
972 return PTR_ERR(priv);
973 }
974
975 if (!priv) {
976 priv = zalloc(sizeof(*priv));
977 if (!priv) {
978 pr_debug("Not enough memory to alloc map private\n");
979 return -ENOMEM;
980 }
981 INIT_LIST_HEAD(&priv->ops_list);
982
983 if (bpf_map__set_priv(map, priv, bpf_map_priv__clear)) {
984 free(priv);
985 return -BPF_LOADER_ERRNO__INTERNAL;
986 }
987 }
988
989 list_add_tail(&op->list, &priv->ops_list);
990 return 0;
991}
992
993static struct bpf_map_op *
994bpf_map__add_newop(struct bpf_map *map, struct parse_events_term *term)
995{
996 struct bpf_map_op *op;
997 int err;
998
999 op = bpf_map_op__new(term);
1000 if (IS_ERR(op))
1001 return op;
1002
1003 err = bpf_map__add_op(map, op);
1004 if (err) {
1005 bpf_map_op__delete(op);
1006 return ERR_PTR(err);
1007 }
1008 return op;
1009}
1010
1011static int
1012__bpf_map__config_value(struct bpf_map *map,
1013 struct parse_events_term *term)
1014{
1015 struct bpf_map_op *op;
1016 const char *map_name = bpf_map__name(map);
1017 const struct bpf_map_def *def = bpf_map__def(map);
1018
1019 if (IS_ERR(def)) {
1020 pr_debug("Unable to get map definition from '%s'\n",
1021 map_name);
1022 return -BPF_LOADER_ERRNO__INTERNAL;
1023 }
1024
1025 if (def->type != BPF_MAP_TYPE_ARRAY) {
1026 pr_debug("Map %s type is not BPF_MAP_TYPE_ARRAY\n",
1027 map_name);
1028 return -BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE;
1029 }
1030 if (def->key_size < sizeof(unsigned int)) {
1031 pr_debug("Map %s has incorrect key size\n", map_name);
1032 return -BPF_LOADER_ERRNO__OBJCONF_MAP_KEYSIZE;
1033 }
1034 switch (def->value_size) {
1035 case 1:
1036 case 2:
1037 case 4:
1038 case 8:
1039 break;
1040 default:
1041 pr_debug("Map %s has incorrect value size\n", map_name);
1042 return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUESIZE;
1043 }
1044
1045 op = bpf_map__add_newop(map, term);
1046 if (IS_ERR(op))
1047 return PTR_ERR(op);
1048 op->op_type = BPF_MAP_OP_SET_VALUE;
1049 op->v.value = term->val.num;
1050 return 0;
1051}
1052
1053static int
1054bpf_map__config_value(struct bpf_map *map,
1055 struct parse_events_term *term,
1056 struct perf_evlist *evlist __maybe_unused)
1057{
1058 if (!term->err_val) {
1059 pr_debug("Config value not set\n");
1060 return -BPF_LOADER_ERRNO__OBJCONF_CONF;
1061 }
1062
1063 if (term->type_val != PARSE_EVENTS__TERM_TYPE_NUM) {
1064 pr_debug("ERROR: wrong value type for 'value'\n");
1065 return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUE;
1066 }
1067
1068 return __bpf_map__config_value(map, term);
1069}
1070
1071static int
1072__bpf_map__config_event(struct bpf_map *map,
1073 struct parse_events_term *term,
1074 struct perf_evlist *evlist)
1075{
1076 struct perf_evsel *evsel;
1077 const struct bpf_map_def *def;
1078 struct bpf_map_op *op;
1079 const char *map_name = bpf_map__name(map);
1080
1081 evsel = perf_evlist__find_evsel_by_str(evlist, term->val.str);
1082 if (!evsel) {
1083 pr_debug("Event (for '%s') '%s' doesn't exist\n",
1084 map_name, term->val.str);
1085 return -BPF_LOADER_ERRNO__OBJCONF_MAP_NOEVT;
1086 }
1087
1088 def = bpf_map__def(map);
1089 if (IS_ERR(def)) {
1090 pr_debug("Unable to get map definition from '%s'\n",
1091 map_name);
1092 return PTR_ERR(def);
1093 }
1094
1095 /*
1096 * No need to check key_size and value_size:
1097 * kernel has already checked them.
1098 */
1099 if (def->type != BPF_MAP_TYPE_PERF_EVENT_ARRAY) {
1100 pr_debug("Map %s type is not BPF_MAP_TYPE_PERF_EVENT_ARRAY\n",
1101 map_name);
1102 return -BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE;
1103 }
1104
1105 op = bpf_map__add_newop(map, term);
1106 if (IS_ERR(op))
1107 return PTR_ERR(op);
1108 op->op_type = BPF_MAP_OP_SET_EVSEL;
1109 op->v.evsel = evsel;
1110 return 0;
1111}
1112
1113static int
1114bpf_map__config_event(struct bpf_map *map,
1115 struct parse_events_term *term,
1116 struct perf_evlist *evlist)
1117{
1118 if (!term->err_val) {
1119 pr_debug("Config value not set\n");
1120 return -BPF_LOADER_ERRNO__OBJCONF_CONF;
1121 }
1122
1123 if (term->type_val != PARSE_EVENTS__TERM_TYPE_STR) {
1124 pr_debug("ERROR: wrong value type for 'event'\n");
1125 return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUE;
1126 }
1127
1128 return __bpf_map__config_event(map, term, evlist);
1129}
1130
1131struct bpf_obj_config__map_func {
1132 const char *config_opt;
1133 int (*config_func)(struct bpf_map *, struct parse_events_term *,
1134 struct perf_evlist *);
1135};
1136
1137struct bpf_obj_config__map_func bpf_obj_config__map_funcs[] = {
1138 {"value", bpf_map__config_value},
1139 {"event", bpf_map__config_event},
1140};
1141
1142static int
1143config_map_indices_range_check(struct parse_events_term *term,
1144 struct bpf_map *map,
1145 const char *map_name)
1146{
1147 struct parse_events_array *array = &term->array;
1148 const struct bpf_map_def *def;
1149 unsigned int i;
1150
1151 if (!array->nr_ranges)
1152 return 0;
1153 if (!array->ranges) {
1154 pr_debug("ERROR: map %s: array->nr_ranges is %d but range array is NULL\n",
1155 map_name, (int)array->nr_ranges);
1156 return -BPF_LOADER_ERRNO__INTERNAL;
1157 }
1158
1159 def = bpf_map__def(map);
1160 if (IS_ERR(def)) {
1161 pr_debug("ERROR: Unable to get map definition from '%s'\n",
1162 map_name);
1163 return -BPF_LOADER_ERRNO__INTERNAL;
1164 }
1165
1166 for (i = 0; i < array->nr_ranges; i++) {
1167 unsigned int start = array->ranges[i].start;
1168 size_t length = array->ranges[i].length;
1169 unsigned int idx = start + length - 1;
1170
1171 if (idx >= def->max_entries) {
1172 pr_debug("ERROR: index %d too large\n", idx);
1173 return -BPF_LOADER_ERRNO__OBJCONF_MAP_IDX2BIG;
1174 }
1175 }
1176 return 0;
1177}
1178
1179static int
1180bpf__obj_config_map(struct bpf_object *obj,
1181 struct parse_events_term *term,
1182 struct perf_evlist *evlist,
1183 int *key_scan_pos)
1184{
1185 /* key is "map:<mapname>.<config opt>" */
1186 char *map_name = strdup(term->config + sizeof("map:") - 1);
1187 struct bpf_map *map;
1188 int err = -BPF_LOADER_ERRNO__OBJCONF_OPT;
1189 char *map_opt;
1190 size_t i;
1191
1192 if (!map_name)
1193 return -ENOMEM;
1194
1195 map_opt = strchr(map_name, '.');
1196 if (!map_opt) {
1197 pr_debug("ERROR: Invalid map config: %s\n", map_name);
1198 goto out;
1199 }
1200
1201 *map_opt++ = '\0';
1202 if (*map_opt == '\0') {
1203 pr_debug("ERROR: Invalid map option: %s\n", term->config);
1204 goto out;
1205 }
1206
1207 map = bpf_object__find_map_by_name(obj, map_name);
1208 if (!map) {
1209 pr_debug("ERROR: Map %s doesn't exist\n", map_name);
1210 err = -BPF_LOADER_ERRNO__OBJCONF_MAP_NOTEXIST;
1211 goto out;
1212 }
1213
1214 *key_scan_pos += strlen(map_opt);
1215 err = config_map_indices_range_check(term, map, map_name);
1216 if (err)
1217 goto out;
1218 *key_scan_pos -= strlen(map_opt);
1219
1220 for (i = 0; i < ARRAY_SIZE(bpf_obj_config__map_funcs); i++) {
1221 struct bpf_obj_config__map_func *func =
1222 &bpf_obj_config__map_funcs[i];
1223
1224 if (strcmp(map_opt, func->config_opt) == 0) {
1225 err = func->config_func(map, term, evlist);
1226 goto out;
1227 }
1228 }
1229
1230 pr_debug("ERROR: Invalid map config option '%s'\n", map_opt);
1231 err = -BPF_LOADER_ERRNO__OBJCONF_MAP_OPT;
1232out:
1233 free(map_name);
1234 if (!err)
1235 key_scan_pos += strlen(map_opt);
1236 return err;
1237}
1238
1239int bpf__config_obj(struct bpf_object *obj,
1240 struct parse_events_term *term,
1241 struct perf_evlist *evlist,
1242 int *error_pos)
1243{
1244 int key_scan_pos = 0;
1245 int err;
1246
1247 if (!obj || !term || !term->config)
1248 return -EINVAL;
1249
1250 if (strstarts(term->config, "map:")) {
1251 key_scan_pos = sizeof("map:") - 1;
1252 err = bpf__obj_config_map(obj, term, evlist, &key_scan_pos);
1253 goto out;
1254 }
1255 err = -BPF_LOADER_ERRNO__OBJCONF_OPT;
1256out:
1257 if (error_pos)
1258 *error_pos = key_scan_pos;
1259 return err;
1260
1261}
1262
1263typedef int (*map_config_func_t)(const char *name, int map_fd,
1264 const struct bpf_map_def *pdef,
1265 struct bpf_map_op *op,
1266 void *pkey, void *arg);
1267
1268static int
1269foreach_key_array_all(map_config_func_t func,
1270 void *arg, const char *name,
1271 int map_fd, const struct bpf_map_def *pdef,
1272 struct bpf_map_op *op)
1273{
1274 unsigned int i;
1275 int err;
1276
1277 for (i = 0; i < pdef->max_entries; i++) {
1278 err = func(name, map_fd, pdef, op, &i, arg);
1279 if (err) {
1280 pr_debug("ERROR: failed to insert value to %s[%u]\n",
1281 name, i);
1282 return err;
1283 }
1284 }
1285 return 0;
1286}
1287
1288static int
1289foreach_key_array_ranges(map_config_func_t func, void *arg,
1290 const char *name, int map_fd,
1291 const struct bpf_map_def *pdef,
1292 struct bpf_map_op *op)
1293{
1294 unsigned int i, j;
1295 int err;
1296
1297 for (i = 0; i < op->k.array.nr_ranges; i++) {
1298 unsigned int start = op->k.array.ranges[i].start;
1299 size_t length = op->k.array.ranges[i].length;
1300
1301 for (j = 0; j < length; j++) {
1302 unsigned int idx = start + j;
1303
1304 err = func(name, map_fd, pdef, op, &idx, arg);
1305 if (err) {
1306 pr_debug("ERROR: failed to insert value to %s[%u]\n",
1307 name, idx);
1308 return err;
1309 }
1310 }
1311 }
1312 return 0;
1313}
1314
1315static int
1316bpf_map_config_foreach_key(struct bpf_map *map,
1317 map_config_func_t func,
1318 void *arg)
1319{
1320 int err, map_fd;
1321 struct bpf_map_op *op;
1322 const struct bpf_map_def *def;
1323 const char *name = bpf_map__name(map);
1324 struct bpf_map_priv *priv = bpf_map__priv(map);
1325
1326 if (IS_ERR(priv)) {
1327 pr_debug("ERROR: failed to get private from map %s\n", name);
1328 return -BPF_LOADER_ERRNO__INTERNAL;
1329 }
1330 if (!priv || list_empty(&priv->ops_list)) {
1331 pr_debug("INFO: nothing to config for map %s\n", name);
1332 return 0;
1333 }
1334
1335 def = bpf_map__def(map);
1336 if (IS_ERR(def)) {
1337 pr_debug("ERROR: failed to get definition from map %s\n", name);
1338 return -BPF_LOADER_ERRNO__INTERNAL;
1339 }
1340 map_fd = bpf_map__fd(map);
1341 if (map_fd < 0) {
1342 pr_debug("ERROR: failed to get fd from map %s\n", name);
1343 return map_fd;
1344 }
1345
1346 list_for_each_entry(op, &priv->ops_list, list) {
1347 switch (def->type) {
1348 case BPF_MAP_TYPE_ARRAY:
1349 case BPF_MAP_TYPE_PERF_EVENT_ARRAY:
1350 switch (op->key_type) {
1351 case BPF_MAP_KEY_ALL:
1352 err = foreach_key_array_all(func, arg, name,
1353 map_fd, def, op);
1354 break;
1355 case BPF_MAP_KEY_RANGES:
1356 err = foreach_key_array_ranges(func, arg, name,
1357 map_fd, def,
1358 op);
1359 break;
1360 default:
1361 pr_debug("ERROR: keytype for map '%s' invalid\n",
1362 name);
1363 return -BPF_LOADER_ERRNO__INTERNAL;
1364 }
1365 if (err)
1366 return err;
1367 break;
1368 default:
1369 pr_debug("ERROR: type of '%s' incorrect\n", name);
1370 return -BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE;
1371 }
1372 }
1373
1374 return 0;
1375}
1376
1377static int
1378apply_config_value_for_key(int map_fd, void *pkey,
1379 size_t val_size, u64 val)
1380{
1381 int err = 0;
1382
1383 switch (val_size) {
1384 case 1: {
1385 u8 _val = (u8)(val);
1386 err = bpf_map_update_elem(map_fd, pkey, &_val, BPF_ANY);
1387 break;
1388 }
1389 case 2: {
1390 u16 _val = (u16)(val);
1391 err = bpf_map_update_elem(map_fd, pkey, &_val, BPF_ANY);
1392 break;
1393 }
1394 case 4: {
1395 u32 _val = (u32)(val);
1396 err = bpf_map_update_elem(map_fd, pkey, &_val, BPF_ANY);
1397 break;
1398 }
1399 case 8: {
1400 err = bpf_map_update_elem(map_fd, pkey, &val, BPF_ANY);
1401 break;
1402 }
1403 default:
1404 pr_debug("ERROR: invalid value size\n");
1405 return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUESIZE;
1406 }
1407 if (err && errno)
1408 err = -errno;
1409 return err;
1410}
1411
1412static int
1413apply_config_evsel_for_key(const char *name, int map_fd, void *pkey,
1414 struct perf_evsel *evsel)
1415{
1416 struct xyarray *xy = evsel->fd;
1417 struct perf_event_attr *attr;
1418 unsigned int key, events;
1419 bool check_pass = false;
1420 int *evt_fd;
1421 int err;
1422
1423 if (!xy) {
1424 pr_debug("ERROR: evsel not ready for map %s\n", name);
1425 return -BPF_LOADER_ERRNO__INTERNAL;
1426 }
1427
1428 if (xy->row_size / xy->entry_size != 1) {
1429 pr_debug("ERROR: Dimension of target event is incorrect for map %s\n",
1430 name);
1431 return -BPF_LOADER_ERRNO__OBJCONF_MAP_EVTDIM;
1432 }
1433
1434 attr = &evsel->attr;
1435 if (attr->inherit) {
1436 pr_debug("ERROR: Can't put inherit event into map %s\n", name);
1437 return -BPF_LOADER_ERRNO__OBJCONF_MAP_EVTINH;
1438 }
1439
1440 if (perf_evsel__is_bpf_output(evsel))
1441 check_pass = true;
1442 if (attr->type == PERF_TYPE_RAW)
1443 check_pass = true;
1444 if (attr->type == PERF_TYPE_HARDWARE)
1445 check_pass = true;
1446 if (!check_pass) {
1447 pr_debug("ERROR: Event type is wrong for map %s\n", name);
1448 return -BPF_LOADER_ERRNO__OBJCONF_MAP_EVTTYPE;
1449 }
1450
1451 events = xy->entries / (xy->row_size / xy->entry_size);
1452 key = *((unsigned int *)pkey);
1453 if (key >= events) {
1454 pr_debug("ERROR: there is no event %d for map %s\n",
1455 key, name);
1456 return -BPF_LOADER_ERRNO__OBJCONF_MAP_MAPSIZE;
1457 }
1458 evt_fd = xyarray__entry(xy, key, 0);
1459 err = bpf_map_update_elem(map_fd, pkey, evt_fd, BPF_ANY);
1460 if (err && errno)
1461 err = -errno;
1462 return err;
1463}
1464
1465static int
1466apply_obj_config_map_for_key(const char *name, int map_fd,
1467 const struct bpf_map_def *pdef,
1468 struct bpf_map_op *op,
1469 void *pkey, void *arg __maybe_unused)
1470{
1471 int err;
1472
1473 switch (op->op_type) {
1474 case BPF_MAP_OP_SET_VALUE:
1475 err = apply_config_value_for_key(map_fd, pkey,
1476 pdef->value_size,
1477 op->v.value);
1478 break;
1479 case BPF_MAP_OP_SET_EVSEL:
1480 err = apply_config_evsel_for_key(name, map_fd, pkey,
1481 op->v.evsel);
1482 break;
1483 default:
1484 pr_debug("ERROR: unknown value type for '%s'\n", name);
1485 err = -BPF_LOADER_ERRNO__INTERNAL;
1486 }
1487 return err;
1488}
1489
1490static int
1491apply_obj_config_map(struct bpf_map *map)
1492{
1493 return bpf_map_config_foreach_key(map,
1494 apply_obj_config_map_for_key,
1495 NULL);
1496}
1497
1498static int
1499apply_obj_config_object(struct bpf_object *obj)
1500{
1501 struct bpf_map *map;
1502 int err;
1503
1504 bpf_map__for_each(map, obj) {
1505 err = apply_obj_config_map(map);
1506 if (err)
1507 return err;
1508 }
1509 return 0;
1510}
1511
1512int bpf__apply_obj_config(void)
1513{
1514 struct bpf_object *obj, *tmp;
1515 int err;
1516
1517 bpf_object__for_each_safe(obj, tmp) {
1518 err = apply_obj_config_object(obj);
1519 if (err)
1520 return err;
1521 }
1522
1523 return 0;
1524}
1525
1526#define bpf__for_each_map(pos, obj, objtmp) \
1527 bpf_object__for_each_safe(obj, objtmp) \
1528 bpf_map__for_each(pos, obj)
1529
1530#define bpf__for_each_stdout_map(pos, obj, objtmp) \
1531 bpf__for_each_map(pos, obj, objtmp) \
1532 if (bpf_map__name(pos) && \
1533 (strcmp("__bpf_stdout__", \
1534 bpf_map__name(pos)) == 0))
1535
1536int bpf__setup_stdout(struct perf_evlist *evlist)
1537{
1538 struct bpf_map_priv *tmpl_priv = NULL;
1539 struct bpf_object *obj, *tmp;
1540 struct perf_evsel *evsel = NULL;
1541 struct bpf_map *map;
1542 int err;
1543 bool need_init = false;
1544
1545 bpf__for_each_stdout_map(map, obj, tmp) {
1546 struct bpf_map_priv *priv = bpf_map__priv(map);
1547
1548 if (IS_ERR(priv))
1549 return -BPF_LOADER_ERRNO__INTERNAL;
1550
1551 /*
1552 * No need to check map type: type should have been
1553 * verified by kernel.
1554 */
1555 if (!need_init && !priv)
1556 need_init = !priv;
1557 if (!tmpl_priv && priv)
1558 tmpl_priv = priv;
1559 }
1560
1561 if (!need_init)
1562 return 0;
1563
1564 if (!tmpl_priv) {
1565 err = parse_events(evlist, "bpf-output/no-inherit=1,name=__bpf_stdout__/",
1566 NULL);
1567 if (err) {
1568 pr_debug("ERROR: failed to create bpf-output event\n");
1569 return -err;
1570 }
1571
1572 evsel = perf_evlist__last(evlist);
1573 }
1574
1575 bpf__for_each_stdout_map(map, obj, tmp) {
1576 struct bpf_map_priv *priv = bpf_map__priv(map);
1577
1578 if (IS_ERR(priv))
1579 return -BPF_LOADER_ERRNO__INTERNAL;
1580 if (priv)
1581 continue;
1582
1583 if (tmpl_priv) {
1584 priv = bpf_map_priv__clone(tmpl_priv);
1585 if (!priv)
1586 return -ENOMEM;
1587
1588 err = bpf_map__set_priv(map, priv, bpf_map_priv__clear);
1589 if (err) {
1590 bpf_map_priv__clear(map, priv);
1591 return err;
1592 }
1593 } else if (evsel) {
1594 struct bpf_map_op *op;
1595
1596 op = bpf_map__add_newop(map, NULL);
1597 if (IS_ERR(op))
1598 return PTR_ERR(op);
1599 op->op_type = BPF_MAP_OP_SET_EVSEL;
1600 op->v.evsel = evsel;
1601 }
1602 }
1603
1604 return 0;
1605}
1606
1607#define ERRNO_OFFSET(e) ((e) - __BPF_LOADER_ERRNO__START)
1608#define ERRCODE_OFFSET(c) ERRNO_OFFSET(BPF_LOADER_ERRNO__##c)
1609#define NR_ERRNO (__BPF_LOADER_ERRNO__END - __BPF_LOADER_ERRNO__START)
1610
1611static const char *bpf_loader_strerror_table[NR_ERRNO] = {
1612 [ERRCODE_OFFSET(CONFIG)] = "Invalid config string",
1613 [ERRCODE_OFFSET(GROUP)] = "Invalid group name",
1614 [ERRCODE_OFFSET(EVENTNAME)] = "No event name found in config string",
1615 [ERRCODE_OFFSET(INTERNAL)] = "BPF loader internal error",
1616 [ERRCODE_OFFSET(COMPILE)] = "Error when compiling BPF scriptlet",
1617 [ERRCODE_OFFSET(PROGCONF_TERM)] = "Invalid program config term in config string",
1618 [ERRCODE_OFFSET(PROLOGUE)] = "Failed to generate prologue",
1619 [ERRCODE_OFFSET(PROLOGUE2BIG)] = "Prologue too big for program",
1620 [ERRCODE_OFFSET(PROLOGUEOOB)] = "Offset out of bound for prologue",
1621 [ERRCODE_OFFSET(OBJCONF_OPT)] = "Invalid object config option",
1622 [ERRCODE_OFFSET(OBJCONF_CONF)] = "Config value not set (missing '=')",
1623 [ERRCODE_OFFSET(OBJCONF_MAP_OPT)] = "Invalid object map config option",
1624 [ERRCODE_OFFSET(OBJCONF_MAP_NOTEXIST)] = "Target map doesn't exist",
1625 [ERRCODE_OFFSET(OBJCONF_MAP_VALUE)] = "Incorrect value type for map",
1626 [ERRCODE_OFFSET(OBJCONF_MAP_TYPE)] = "Incorrect map type",
1627 [ERRCODE_OFFSET(OBJCONF_MAP_KEYSIZE)] = "Incorrect map key size",
1628 [ERRCODE_OFFSET(OBJCONF_MAP_VALUESIZE)] = "Incorrect map value size",
1629 [ERRCODE_OFFSET(OBJCONF_MAP_NOEVT)] = "Event not found for map setting",
1630 [ERRCODE_OFFSET(OBJCONF_MAP_MAPSIZE)] = "Invalid map size for event setting",
1631 [ERRCODE_OFFSET(OBJCONF_MAP_EVTDIM)] = "Event dimension too large",
1632 [ERRCODE_OFFSET(OBJCONF_MAP_EVTINH)] = "Doesn't support inherit event",
1633 [ERRCODE_OFFSET(OBJCONF_MAP_EVTTYPE)] = "Wrong event type for map",
1634 [ERRCODE_OFFSET(OBJCONF_MAP_IDX2BIG)] = "Index too large",
1635};
1636
1637static int
1638bpf_loader_strerror(int err, char *buf, size_t size)
1639{
1640 char sbuf[STRERR_BUFSIZE];
1641 const char *msg;
1642
1643 if (!buf || !size)
1644 return -1;
1645
1646 err = err > 0 ? err : -err;
1647
1648 if (err >= __LIBBPF_ERRNO__START)
1649 return libbpf_strerror(err, buf, size);
1650
1651 if (err >= __BPF_LOADER_ERRNO__START && err < __BPF_LOADER_ERRNO__END) {
1652 msg = bpf_loader_strerror_table[ERRNO_OFFSET(err)];
1653 snprintf(buf, size, "%s", msg);
1654 buf[size - 1] = '\0';
1655 return 0;
1656 }
1657
1658 if (err >= __BPF_LOADER_ERRNO__END)
1659 snprintf(buf, size, "Unknown bpf loader error %d", err);
1660 else
1661 snprintf(buf, size, "%s",
1662 str_error_r(err, sbuf, sizeof(sbuf)));
1663
1664 buf[size - 1] = '\0';
1665 return -1;
1666}
1667
1668#define bpf__strerror_head(err, buf, size) \
1669 char sbuf[STRERR_BUFSIZE], *emsg;\
1670 if (!size)\
1671 return 0;\
1672 if (err < 0)\
1673 err = -err;\
1674 bpf_loader_strerror(err, sbuf, sizeof(sbuf));\
1675 emsg = sbuf;\
1676 switch (err) {\
1677 default:\
1678 scnprintf(buf, size, "%s", emsg);\
1679 break;
1680
1681#define bpf__strerror_entry(val, fmt...)\
1682 case val: {\
1683 scnprintf(buf, size, fmt);\
1684 break;\
1685 }
1686
1687#define bpf__strerror_end(buf, size)\
1688 }\
1689 buf[size - 1] = '\0';
1690
1691int bpf__strerror_prepare_load(const char *filename, bool source,
1692 int err, char *buf, size_t size)
1693{
1694 size_t n;
1695 int ret;
1696
1697 n = snprintf(buf, size, "Failed to load %s%s: ",
1698 filename, source ? " from source" : "");
1699 if (n >= size) {
1700 buf[size - 1] = '\0';
1701 return 0;
1702 }
1703 buf += n;
1704 size -= n;
1705
1706 ret = bpf_loader_strerror(err, buf, size);
1707 buf[size - 1] = '\0';
1708 return ret;
1709}
1710
1711int bpf__strerror_probe(struct bpf_object *obj __maybe_unused,
1712 int err, char *buf, size_t size)
1713{
1714 bpf__strerror_head(err, buf, size);
1715 case BPF_LOADER_ERRNO__PROGCONF_TERM: {
1716 scnprintf(buf, size, "%s (add -v to see detail)", emsg);
1717 break;
1718 }
1719 bpf__strerror_entry(EEXIST, "Probe point exist. Try 'perf probe -d \"*\"' and set 'force=yes'");
1720 bpf__strerror_entry(EACCES, "You need to be root");
1721 bpf__strerror_entry(EPERM, "You need to be root, and /proc/sys/kernel/kptr_restrict should be 0");
1722 bpf__strerror_entry(ENOENT, "You need to check probing points in BPF file");
1723 bpf__strerror_end(buf, size);
1724 return 0;
1725}
1726
1727int bpf__strerror_load(struct bpf_object *obj,
1728 int err, char *buf, size_t size)
1729{
1730 bpf__strerror_head(err, buf, size);
1731 case LIBBPF_ERRNO__KVER: {
1732 unsigned int obj_kver = bpf_object__kversion(obj);
1733 unsigned int real_kver;
1734
1735 if (fetch_kernel_version(&real_kver, NULL, 0)) {
1736 scnprintf(buf, size, "Unable to fetch kernel version");
1737 break;
1738 }
1739
1740 if (obj_kver != real_kver) {
1741 scnprintf(buf, size,
1742 "'version' ("KVER_FMT") doesn't match running kernel ("KVER_FMT")",
1743 KVER_PARAM(obj_kver),
1744 KVER_PARAM(real_kver));
1745 break;
1746 }
1747
1748 scnprintf(buf, size, "Failed to load program for unknown reason");
1749 break;
1750 }
1751 bpf__strerror_end(buf, size);
1752 return 0;
1753}
1754
1755int bpf__strerror_config_obj(struct bpf_object *obj __maybe_unused,
1756 struct parse_events_term *term __maybe_unused,
1757 struct perf_evlist *evlist __maybe_unused,
1758 int *error_pos __maybe_unused, int err,
1759 char *buf, size_t size)
1760{
1761 bpf__strerror_head(err, buf, size);
1762 bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE,
1763 "Can't use this config term with this map type");
1764 bpf__strerror_end(buf, size);
1765 return 0;
1766}
1767
1768int bpf__strerror_apply_obj_config(int err, char *buf, size_t size)
1769{
1770 bpf__strerror_head(err, buf, size);
1771 bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_EVTDIM,
1772 "Cannot set event to BPF map in multi-thread tracing");
1773 bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_EVTINH,
1774 "%s (Hint: use -i to turn off inherit)", emsg);
1775 bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_EVTTYPE,
1776 "Can only put raw, hardware and BPF output event into a BPF map");
1777 bpf__strerror_end(buf, size);
1778 return 0;
1779}
1780
1781int bpf__strerror_setup_stdout(struct perf_evlist *evlist __maybe_unused,
1782 int err, char *buf, size_t size)
1783{
1784 bpf__strerror_head(err, buf, size);
1785 bpf__strerror_end(buf, size);
1786 return 0;
1787}