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