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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}
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 config_str = bpf_program__title(prog, false);
332 if (IS_ERR(config_str)) {
333 pr_debug("bpf: unable to get title for program\n");
334 return PTR_ERR(config_str);
335 }
336
337 priv = calloc(sizeof(*priv), 1);
338 if (!priv) {
339 pr_debug("bpf: failed to alloc priv\n");
340 return -ENOMEM;
341 }
342 pev = &priv->pev;
343
344 pr_debug("bpf: config program '%s'\n", config_str);
345 err = parse_prog_config(config_str, &main_str, &is_tp, pev);
346 if (err)
347 goto errout;
348
349 if (is_tp) {
350 char *s = strchr(main_str, ':');
351
352 priv->is_tp = true;
353 priv->sys_name = strndup(main_str, s - main_str);
354 priv->evt_name = strdup(s + 1);
355 goto set_priv;
356 }
357
358 if (pev->group && strcmp(pev->group, PERF_BPF_PROBE_GROUP)) {
359 pr_debug("bpf: '%s': group for event is set and not '%s'.\n",
360 config_str, PERF_BPF_PROBE_GROUP);
361 err = -BPF_LOADER_ERRNO__GROUP;
362 goto errout;
363 } else if (!pev->group)
364 pev->group = strdup(PERF_BPF_PROBE_GROUP);
365
366 if (!pev->group) {
367 pr_debug("bpf: strdup failed\n");
368 err = -ENOMEM;
369 goto errout;
370 }
371
372 if (!pev->event) {
373 pr_debug("bpf: '%s': event name is missing. Section name should be 'key=value'\n",
374 config_str);
375 err = -BPF_LOADER_ERRNO__EVENTNAME;
376 goto errout;
377 }
378 pr_debug("bpf: config '%s' is ok\n", config_str);
379
380set_priv:
381 err = bpf_program__set_priv(prog, priv, clear_prog_priv);
382 if (err) {
383 pr_debug("Failed to set priv for program '%s'\n", config_str);
384 goto errout;
385 }
386
387 return 0;
388
389errout:
390 if (pev)
391 clear_perf_probe_event(pev);
392 free(priv);
393 return err;
394}
395
396static int bpf__prepare_probe(void)
397{
398 static int err = 0;
399 static bool initialized = false;
400
401 /*
402 * Make err static, so if init failed the first, bpf__prepare_probe()
403 * fails each time without calling init_probe_symbol_maps multiple
404 * times.
405 */
406 if (initialized)
407 return err;
408
409 initialized = true;
410 err = init_probe_symbol_maps(false);
411 if (err < 0)
412 pr_debug("Failed to init_probe_symbol_maps\n");
413 probe_conf.max_probes = MAX_PROBES;
414 return err;
415}
416
417static int
418preproc_gen_prologue(struct bpf_program *prog, int n,
419 struct bpf_insn *orig_insns, int orig_insns_cnt,
420 struct bpf_prog_prep_result *res)
421{
422 struct bpf_prog_priv *priv = bpf_program__priv(prog);
423 struct probe_trace_event *tev;
424 struct perf_probe_event *pev;
425 struct bpf_insn *buf;
426 size_t prologue_cnt = 0;
427 int i, err;
428
429 if (IS_ERR(priv) || !priv || priv->is_tp)
430 goto errout;
431
432 pev = &priv->pev;
433
434 if (n < 0 || n >= priv->nr_types)
435 goto errout;
436
437 /* Find a tev belongs to that type */
438 for (i = 0; i < pev->ntevs; i++) {
439 if (priv->type_mapping[i] == n)
440 break;
441 }
442
443 if (i >= pev->ntevs) {
444 pr_debug("Internal error: prologue type %d not found\n", n);
445 return -BPF_LOADER_ERRNO__PROLOGUE;
446 }
447
448 tev = &pev->tevs[i];
449
450 buf = priv->insns_buf;
451 err = bpf__gen_prologue(tev->args, tev->nargs,
452 buf, &prologue_cnt,
453 BPF_MAXINSNS - orig_insns_cnt);
454 if (err) {
455 const char *title;
456
457 title = bpf_program__title(prog, false);
458 if (!title)
459 title = "[unknown]";
460
461 pr_debug("Failed to generate prologue for program %s\n",
462 title);
463 return err;
464 }
465
466 memcpy(&buf[prologue_cnt], orig_insns,
467 sizeof(struct bpf_insn) * orig_insns_cnt);
468
469 res->new_insn_ptr = buf;
470 res->new_insn_cnt = prologue_cnt + orig_insns_cnt;
471 res->pfd = NULL;
472 return 0;
473
474errout:
475 pr_debug("Internal error in preproc_gen_prologue\n");
476 return -BPF_LOADER_ERRNO__PROLOGUE;
477}
478
479/*
480 * compare_tev_args is reflexive, transitive and antisymmetric.
481 * I can proof it but this margin is too narrow to contain.
482 */
483static int compare_tev_args(const void *ptev1, const void *ptev2)
484{
485 int i, ret;
486 const struct probe_trace_event *tev1 =
487 *(const struct probe_trace_event **)ptev1;
488 const struct probe_trace_event *tev2 =
489 *(const struct probe_trace_event **)ptev2;
490
491 ret = tev2->nargs - tev1->nargs;
492 if (ret)
493 return ret;
494
495 for (i = 0; i < tev1->nargs; i++) {
496 struct probe_trace_arg *arg1, *arg2;
497 struct probe_trace_arg_ref *ref1, *ref2;
498
499 arg1 = &tev1->args[i];
500 arg2 = &tev2->args[i];
501
502 ret = strcmp(arg1->value, arg2->value);
503 if (ret)
504 return ret;
505
506 ref1 = arg1->ref;
507 ref2 = arg2->ref;
508
509 while (ref1 && ref2) {
510 ret = ref2->offset - ref1->offset;
511 if (ret)
512 return ret;
513
514 ref1 = ref1->next;
515 ref2 = ref2->next;
516 }
517
518 if (ref1 || ref2)
519 return ref2 ? 1 : -1;
520 }
521
522 return 0;
523}
524
525/*
526 * Assign a type number to each tevs in a pev.
527 * mapping is an array with same slots as tevs in that pev.
528 * nr_types will be set to number of types.
529 */
530static int map_prologue(struct perf_probe_event *pev, int *mapping,
531 int *nr_types)
532{
533 int i, type = 0;
534 struct probe_trace_event **ptevs;
535
536 size_t array_sz = sizeof(*ptevs) * pev->ntevs;
537
538 ptevs = malloc(array_sz);
539 if (!ptevs) {
540 pr_debug("Not enough memory: alloc ptevs failed\n");
541 return -ENOMEM;
542 }
543
544 pr_debug("In map_prologue, ntevs=%d\n", pev->ntevs);
545 for (i = 0; i < pev->ntevs; i++)
546 ptevs[i] = &pev->tevs[i];
547
548 qsort(ptevs, pev->ntevs, sizeof(*ptevs),
549 compare_tev_args);
550
551 for (i = 0; i < pev->ntevs; i++) {
552 int n;
553
554 n = ptevs[i] - pev->tevs;
555 if (i == 0) {
556 mapping[n] = type;
557 pr_debug("mapping[%d]=%d\n", n, type);
558 continue;
559 }
560
561 if (compare_tev_args(ptevs + i, ptevs + i - 1) == 0)
562 mapping[n] = type;
563 else
564 mapping[n] = ++type;
565
566 pr_debug("mapping[%d]=%d\n", n, mapping[n]);
567 }
568 free(ptevs);
569 *nr_types = type + 1;
570
571 return 0;
572}
573
574static int hook_load_preprocessor(struct bpf_program *prog)
575{
576 struct bpf_prog_priv *priv = bpf_program__priv(prog);
577 struct perf_probe_event *pev;
578 bool need_prologue = false;
579 int err, i;
580
581 if (IS_ERR(priv) || !priv) {
582 pr_debug("Internal error when hook preprocessor\n");
583 return -BPF_LOADER_ERRNO__INTERNAL;
584 }
585
586 if (priv->is_tp) {
587 priv->need_prologue = false;
588 return 0;
589 }
590
591 pev = &priv->pev;
592 for (i = 0; i < pev->ntevs; i++) {
593 struct probe_trace_event *tev = &pev->tevs[i];
594
595 if (tev->nargs > 0) {
596 need_prologue = true;
597 break;
598 }
599 }
600
601 /*
602 * Since all tevs don't have argument, we don't need generate
603 * prologue.
604 */
605 if (!need_prologue) {
606 priv->need_prologue = false;
607 return 0;
608 }
609
610 priv->need_prologue = true;
611 priv->insns_buf = malloc(sizeof(struct bpf_insn) * BPF_MAXINSNS);
612 if (!priv->insns_buf) {
613 pr_debug("Not enough memory: alloc insns_buf failed\n");
614 return -ENOMEM;
615 }
616
617 priv->type_mapping = malloc(sizeof(int) * pev->ntevs);
618 if (!priv->type_mapping) {
619 pr_debug("Not enough memory: alloc type_mapping failed\n");
620 return -ENOMEM;
621 }
622 memset(priv->type_mapping, -1,
623 sizeof(int) * pev->ntevs);
624
625 err = map_prologue(pev, priv->type_mapping, &priv->nr_types);
626 if (err)
627 return err;
628
629 err = bpf_program__set_prep(prog, priv->nr_types,
630 preproc_gen_prologue);
631 return err;
632}
633
634int bpf__probe(struct bpf_object *obj)
635{
636 int err = 0;
637 struct bpf_program *prog;
638 struct bpf_prog_priv *priv;
639 struct perf_probe_event *pev;
640
641 err = bpf__prepare_probe();
642 if (err) {
643 pr_debug("bpf__prepare_probe failed\n");
644 return err;
645 }
646
647 bpf_object__for_each_program(prog, obj) {
648 err = config_bpf_program(prog);
649 if (err)
650 goto out;
651
652 priv = bpf_program__priv(prog);
653 if (IS_ERR(priv) || !priv) {
654 err = PTR_ERR(priv);
655 goto out;
656 }
657
658 if (priv->is_tp) {
659 bpf_program__set_tracepoint(prog);
660 continue;
661 }
662
663 bpf_program__set_kprobe(prog);
664 pev = &priv->pev;
665
666 err = convert_perf_probe_events(pev, 1);
667 if (err < 0) {
668 pr_debug("bpf_probe: failed to convert perf probe events\n");
669 goto out;
670 }
671
672 err = apply_perf_probe_events(pev, 1);
673 if (err < 0) {
674 pr_debug("bpf_probe: failed to apply perf probe events\n");
675 goto out;
676 }
677
678 /*
679 * After probing, let's consider prologue, which
680 * adds program fetcher to BPF programs.
681 *
682 * hook_load_preprocessorr() hooks pre-processor
683 * to bpf_program, let it generate prologue
684 * dynamically during loading.
685 */
686 err = hook_load_preprocessor(prog);
687 if (err)
688 goto out;
689 }
690out:
691 return err < 0 ? err : 0;
692}
693
694#define EVENTS_WRITE_BUFSIZE 4096
695int bpf__unprobe(struct bpf_object *obj)
696{
697 int err, ret = 0;
698 struct bpf_program *prog;
699
700 bpf_object__for_each_program(prog, obj) {
701 struct bpf_prog_priv *priv = bpf_program__priv(prog);
702 int i;
703
704 if (IS_ERR(priv) || !priv || priv->is_tp)
705 continue;
706
707 for (i = 0; i < priv->pev.ntevs; i++) {
708 struct probe_trace_event *tev = &priv->pev.tevs[i];
709 char name_buf[EVENTS_WRITE_BUFSIZE];
710 struct strfilter *delfilter;
711
712 snprintf(name_buf, EVENTS_WRITE_BUFSIZE,
713 "%s:%s", tev->group, tev->event);
714 name_buf[EVENTS_WRITE_BUFSIZE - 1] = '\0';
715
716 delfilter = strfilter__new(name_buf, NULL);
717 if (!delfilter) {
718 pr_debug("Failed to create filter for unprobing\n");
719 ret = -ENOMEM;
720 continue;
721 }
722
723 err = del_perf_probe_events(delfilter);
724 strfilter__delete(delfilter);
725 if (err) {
726 pr_debug("Failed to delete %s\n", name_buf);
727 ret = err;
728 continue;
729 }
730 }
731 }
732 return ret;
733}
734
735int bpf__load(struct bpf_object *obj)
736{
737 int err;
738
739 err = bpf_object__load(obj);
740 if (err) {
741 char bf[128];
742 libbpf_strerror(err, bf, sizeof(bf));
743 pr_debug("bpf: load objects failed: err=%d: (%s)\n", err, bf);
744 return err;
745 }
746 return 0;
747}
748
749int bpf__foreach_event(struct bpf_object *obj,
750 bpf_prog_iter_callback_t func,
751 void *arg)
752{
753 struct bpf_program *prog;
754 int err;
755
756 bpf_object__for_each_program(prog, obj) {
757 struct bpf_prog_priv *priv = bpf_program__priv(prog);
758 struct probe_trace_event *tev;
759 struct perf_probe_event *pev;
760 int i, fd;
761
762 if (IS_ERR(priv) || !priv) {
763 pr_debug("bpf: failed to get private field\n");
764 return -BPF_LOADER_ERRNO__INTERNAL;
765 }
766
767 if (priv->is_tp) {
768 fd = bpf_program__fd(prog);
769 err = (*func)(priv->sys_name, priv->evt_name, fd, obj, arg);
770 if (err) {
771 pr_debug("bpf: tracepoint call back failed, stop iterate\n");
772 return err;
773 }
774 continue;
775 }
776
777 pev = &priv->pev;
778 for (i = 0; i < pev->ntevs; i++) {
779 tev = &pev->tevs[i];
780
781 if (priv->need_prologue) {
782 int type = priv->type_mapping[i];
783
784 fd = bpf_program__nth_fd(prog, type);
785 } else {
786 fd = bpf_program__fd(prog);
787 }
788
789 if (fd < 0) {
790 pr_debug("bpf: failed to get file descriptor\n");
791 return fd;
792 }
793
794 err = (*func)(tev->group, tev->event, fd, obj, arg);
795 if (err) {
796 pr_debug("bpf: call back failed, stop iterate\n");
797 return err;
798 }
799 }
800 }
801 return 0;
802}
803
804enum bpf_map_op_type {
805 BPF_MAP_OP_SET_VALUE,
806 BPF_MAP_OP_SET_EVSEL,
807};
808
809enum bpf_map_key_type {
810 BPF_MAP_KEY_ALL,
811 BPF_MAP_KEY_RANGES,
812};
813
814struct bpf_map_op {
815 struct list_head list;
816 enum bpf_map_op_type op_type;
817 enum bpf_map_key_type key_type;
818 union {
819 struct parse_events_array array;
820 } k;
821 union {
822 u64 value;
823 struct evsel *evsel;
824 } v;
825};
826
827struct bpf_map_priv {
828 struct list_head ops_list;
829};
830
831static void
832bpf_map_op__delete(struct bpf_map_op *op)
833{
834 if (!list_empty(&op->list))
835 list_del_init(&op->list);
836 if (op->key_type == BPF_MAP_KEY_RANGES)
837 parse_events__clear_array(&op->k.array);
838 free(op);
839}
840
841static void
842bpf_map_priv__purge(struct bpf_map_priv *priv)
843{
844 struct bpf_map_op *pos, *n;
845
846 list_for_each_entry_safe(pos, n, &priv->ops_list, list) {
847 list_del_init(&pos->list);
848 bpf_map_op__delete(pos);
849 }
850}
851
852static void
853bpf_map_priv__clear(struct bpf_map *map __maybe_unused,
854 void *_priv)
855{
856 struct bpf_map_priv *priv = _priv;
857
858 bpf_map_priv__purge(priv);
859 free(priv);
860}
861
862static int
863bpf_map_op_setkey(struct bpf_map_op *op, struct parse_events_term *term)
864{
865 op->key_type = BPF_MAP_KEY_ALL;
866 if (!term)
867 return 0;
868
869 if (term->array.nr_ranges) {
870 size_t memsz = term->array.nr_ranges *
871 sizeof(op->k.array.ranges[0]);
872
873 op->k.array.ranges = memdup(term->array.ranges, memsz);
874 if (!op->k.array.ranges) {
875 pr_debug("Not enough memory to alloc indices for map\n");
876 return -ENOMEM;
877 }
878 op->key_type = BPF_MAP_KEY_RANGES;
879 op->k.array.nr_ranges = term->array.nr_ranges;
880 }
881 return 0;
882}
883
884static struct bpf_map_op *
885bpf_map_op__new(struct parse_events_term *term)
886{
887 struct bpf_map_op *op;
888 int err;
889
890 op = zalloc(sizeof(*op));
891 if (!op) {
892 pr_debug("Failed to alloc bpf_map_op\n");
893 return ERR_PTR(-ENOMEM);
894 }
895 INIT_LIST_HEAD(&op->list);
896
897 err = bpf_map_op_setkey(op, term);
898 if (err) {
899 free(op);
900 return ERR_PTR(err);
901 }
902 return op;
903}
904
905static struct bpf_map_op *
906bpf_map_op__clone(struct bpf_map_op *op)
907{
908 struct bpf_map_op *newop;
909
910 newop = memdup(op, sizeof(*op));
911 if (!newop) {
912 pr_debug("Failed to alloc bpf_map_op\n");
913 return NULL;
914 }
915
916 INIT_LIST_HEAD(&newop->list);
917 if (op->key_type == BPF_MAP_KEY_RANGES) {
918 size_t memsz = op->k.array.nr_ranges *
919 sizeof(op->k.array.ranges[0]);
920
921 newop->k.array.ranges = memdup(op->k.array.ranges, memsz);
922 if (!newop->k.array.ranges) {
923 pr_debug("Failed to alloc indices for map\n");
924 free(newop);
925 return NULL;
926 }
927 }
928
929 return newop;
930}
931
932static struct bpf_map_priv *
933bpf_map_priv__clone(struct bpf_map_priv *priv)
934{
935 struct bpf_map_priv *newpriv;
936 struct bpf_map_op *pos, *newop;
937
938 newpriv = zalloc(sizeof(*newpriv));
939 if (!newpriv) {
940 pr_debug("Not enough memory to alloc map private\n");
941 return NULL;
942 }
943 INIT_LIST_HEAD(&newpriv->ops_list);
944
945 list_for_each_entry(pos, &priv->ops_list, list) {
946 newop = bpf_map_op__clone(pos);
947 if (!newop) {
948 bpf_map_priv__purge(newpriv);
949 return NULL;
950 }
951 list_add_tail(&newop->list, &newpriv->ops_list);
952 }
953
954 return newpriv;
955}
956
957static int
958bpf_map__add_op(struct bpf_map *map, struct bpf_map_op *op)
959{
960 const char *map_name = bpf_map__name(map);
961 struct bpf_map_priv *priv = bpf_map__priv(map);
962
963 if (IS_ERR(priv)) {
964 pr_debug("Failed to get private from map %s\n", map_name);
965 return PTR_ERR(priv);
966 }
967
968 if (!priv) {
969 priv = zalloc(sizeof(*priv));
970 if (!priv) {
971 pr_debug("Not enough memory to alloc map private\n");
972 return -ENOMEM;
973 }
974 INIT_LIST_HEAD(&priv->ops_list);
975
976 if (bpf_map__set_priv(map, priv, bpf_map_priv__clear)) {
977 free(priv);
978 return -BPF_LOADER_ERRNO__INTERNAL;
979 }
980 }
981
982 list_add_tail(&op->list, &priv->ops_list);
983 return 0;
984}
985
986static struct bpf_map_op *
987bpf_map__add_newop(struct bpf_map *map, struct parse_events_term *term)
988{
989 struct bpf_map_op *op;
990 int err;
991
992 op = bpf_map_op__new(term);
993 if (IS_ERR(op))
994 return op;
995
996 err = bpf_map__add_op(map, op);
997 if (err) {
998 bpf_map_op__delete(op);
999 return ERR_PTR(err);
1000 }
1001 return op;
1002}
1003
1004static int
1005__bpf_map__config_value(struct bpf_map *map,
1006 struct parse_events_term *term)
1007{
1008 struct bpf_map_op *op;
1009 const char *map_name = bpf_map__name(map);
1010 const struct bpf_map_def *def = bpf_map__def(map);
1011
1012 if (IS_ERR(def)) {
1013 pr_debug("Unable to get map definition from '%s'\n",
1014 map_name);
1015 return -BPF_LOADER_ERRNO__INTERNAL;
1016 }
1017
1018 if (def->type != BPF_MAP_TYPE_ARRAY) {
1019 pr_debug("Map %s type is not BPF_MAP_TYPE_ARRAY\n",
1020 map_name);
1021 return -BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE;
1022 }
1023 if (def->key_size < sizeof(unsigned int)) {
1024 pr_debug("Map %s has incorrect key size\n", map_name);
1025 return -BPF_LOADER_ERRNO__OBJCONF_MAP_KEYSIZE;
1026 }
1027 switch (def->value_size) {
1028 case 1:
1029 case 2:
1030 case 4:
1031 case 8:
1032 break;
1033 default:
1034 pr_debug("Map %s has incorrect value size\n", map_name);
1035 return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUESIZE;
1036 }
1037
1038 op = bpf_map__add_newop(map, term);
1039 if (IS_ERR(op))
1040 return PTR_ERR(op);
1041 op->op_type = BPF_MAP_OP_SET_VALUE;
1042 op->v.value = term->val.num;
1043 return 0;
1044}
1045
1046static int
1047bpf_map__config_value(struct bpf_map *map,
1048 struct parse_events_term *term,
1049 struct evlist *evlist __maybe_unused)
1050{
1051 if (!term->err_val) {
1052 pr_debug("Config value not set\n");
1053 return -BPF_LOADER_ERRNO__OBJCONF_CONF;
1054 }
1055
1056 if (term->type_val != PARSE_EVENTS__TERM_TYPE_NUM) {
1057 pr_debug("ERROR: wrong value type for 'value'\n");
1058 return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUE;
1059 }
1060
1061 return __bpf_map__config_value(map, term);
1062}
1063
1064static int
1065__bpf_map__config_event(struct bpf_map *map,
1066 struct parse_events_term *term,
1067 struct evlist *evlist)
1068{
1069 struct evsel *evsel;
1070 const struct bpf_map_def *def;
1071 struct bpf_map_op *op;
1072 const char *map_name = bpf_map__name(map);
1073
1074 evsel = perf_evlist__find_evsel_by_str(evlist, term->val.str);
1075 if (!evsel) {
1076 pr_debug("Event (for '%s') '%s' doesn't exist\n",
1077 map_name, term->val.str);
1078 return -BPF_LOADER_ERRNO__OBJCONF_MAP_NOEVT;
1079 }
1080
1081 def = bpf_map__def(map);
1082 if (IS_ERR(def)) {
1083 pr_debug("Unable to get map definition from '%s'\n",
1084 map_name);
1085 return PTR_ERR(def);
1086 }
1087
1088 /*
1089 * No need to check key_size and value_size:
1090 * kernel has already checked them.
1091 */
1092 if (def->type != BPF_MAP_TYPE_PERF_EVENT_ARRAY) {
1093 pr_debug("Map %s type is not BPF_MAP_TYPE_PERF_EVENT_ARRAY\n",
1094 map_name);
1095 return -BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE;
1096 }
1097
1098 op = bpf_map__add_newop(map, term);
1099 if (IS_ERR(op))
1100 return PTR_ERR(op);
1101 op->op_type = BPF_MAP_OP_SET_EVSEL;
1102 op->v.evsel = evsel;
1103 return 0;
1104}
1105
1106static int
1107bpf_map__config_event(struct bpf_map *map,
1108 struct parse_events_term *term,
1109 struct evlist *evlist)
1110{
1111 if (!term->err_val) {
1112 pr_debug("Config value not set\n");
1113 return -BPF_LOADER_ERRNO__OBJCONF_CONF;
1114 }
1115
1116 if (term->type_val != PARSE_EVENTS__TERM_TYPE_STR) {
1117 pr_debug("ERROR: wrong value type for 'event'\n");
1118 return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUE;
1119 }
1120
1121 return __bpf_map__config_event(map, term, evlist);
1122}
1123
1124struct bpf_obj_config__map_func {
1125 const char *config_opt;
1126 int (*config_func)(struct bpf_map *, struct parse_events_term *,
1127 struct evlist *);
1128};
1129
1130struct bpf_obj_config__map_func bpf_obj_config__map_funcs[] = {
1131 {"value", bpf_map__config_value},
1132 {"event", bpf_map__config_event},
1133};
1134
1135static int
1136config_map_indices_range_check(struct parse_events_term *term,
1137 struct bpf_map *map,
1138 const char *map_name)
1139{
1140 struct parse_events_array *array = &term->array;
1141 const struct bpf_map_def *def;
1142 unsigned int i;
1143
1144 if (!array->nr_ranges)
1145 return 0;
1146 if (!array->ranges) {
1147 pr_debug("ERROR: map %s: array->nr_ranges is %d but range array is NULL\n",
1148 map_name, (int)array->nr_ranges);
1149 return -BPF_LOADER_ERRNO__INTERNAL;
1150 }
1151
1152 def = bpf_map__def(map);
1153 if (IS_ERR(def)) {
1154 pr_debug("ERROR: Unable to get map definition from '%s'\n",
1155 map_name);
1156 return -BPF_LOADER_ERRNO__INTERNAL;
1157 }
1158
1159 for (i = 0; i < array->nr_ranges; i++) {
1160 unsigned int start = array->ranges[i].start;
1161 size_t length = array->ranges[i].length;
1162 unsigned int idx = start + length - 1;
1163
1164 if (idx >= def->max_entries) {
1165 pr_debug("ERROR: index %d too large\n", idx);
1166 return -BPF_LOADER_ERRNO__OBJCONF_MAP_IDX2BIG;
1167 }
1168 }
1169 return 0;
1170}
1171
1172static int
1173bpf__obj_config_map(struct bpf_object *obj,
1174 struct parse_events_term *term,
1175 struct evlist *evlist,
1176 int *key_scan_pos)
1177{
1178 /* key is "map:<mapname>.<config opt>" */
1179 char *map_name = strdup(term->config + sizeof("map:") - 1);
1180 struct bpf_map *map;
1181 int err = -BPF_LOADER_ERRNO__OBJCONF_OPT;
1182 char *map_opt;
1183 size_t i;
1184
1185 if (!map_name)
1186 return -ENOMEM;
1187
1188 map_opt = strchr(map_name, '.');
1189 if (!map_opt) {
1190 pr_debug("ERROR: Invalid map config: %s\n", map_name);
1191 goto out;
1192 }
1193
1194 *map_opt++ = '\0';
1195 if (*map_opt == '\0') {
1196 pr_debug("ERROR: Invalid map option: %s\n", term->config);
1197 goto out;
1198 }
1199
1200 map = bpf_object__find_map_by_name(obj, map_name);
1201 if (!map) {
1202 pr_debug("ERROR: Map %s doesn't exist\n", map_name);
1203 err = -BPF_LOADER_ERRNO__OBJCONF_MAP_NOTEXIST;
1204 goto out;
1205 }
1206
1207 *key_scan_pos += strlen(map_opt);
1208 err = config_map_indices_range_check(term, map, map_name);
1209 if (err)
1210 goto out;
1211 *key_scan_pos -= strlen(map_opt);
1212
1213 for (i = 0; i < ARRAY_SIZE(bpf_obj_config__map_funcs); i++) {
1214 struct bpf_obj_config__map_func *func =
1215 &bpf_obj_config__map_funcs[i];
1216
1217 if (strcmp(map_opt, func->config_opt) == 0) {
1218 err = func->config_func(map, term, evlist);
1219 goto out;
1220 }
1221 }
1222
1223 pr_debug("ERROR: Invalid map config option '%s'\n", map_opt);
1224 err = -BPF_LOADER_ERRNO__OBJCONF_MAP_OPT;
1225out:
1226 free(map_name);
1227 if (!err)
1228 key_scan_pos += strlen(map_opt);
1229 return err;
1230}
1231
1232int bpf__config_obj(struct bpf_object *obj,
1233 struct parse_events_term *term,
1234 struct evlist *evlist,
1235 int *error_pos)
1236{
1237 int key_scan_pos = 0;
1238 int err;
1239
1240 if (!obj || !term || !term->config)
1241 return -EINVAL;
1242
1243 if (strstarts(term->config, "map:")) {
1244 key_scan_pos = sizeof("map:") - 1;
1245 err = bpf__obj_config_map(obj, term, evlist, &key_scan_pos);
1246 goto out;
1247 }
1248 err = -BPF_LOADER_ERRNO__OBJCONF_OPT;
1249out:
1250 if (error_pos)
1251 *error_pos = key_scan_pos;
1252 return err;
1253
1254}
1255
1256typedef int (*map_config_func_t)(const char *name, int map_fd,
1257 const struct bpf_map_def *pdef,
1258 struct bpf_map_op *op,
1259 void *pkey, void *arg);
1260
1261static int
1262foreach_key_array_all(map_config_func_t func,
1263 void *arg, const char *name,
1264 int map_fd, const struct bpf_map_def *pdef,
1265 struct bpf_map_op *op)
1266{
1267 unsigned int i;
1268 int err;
1269
1270 for (i = 0; i < pdef->max_entries; i++) {
1271 err = func(name, map_fd, pdef, op, &i, arg);
1272 if (err) {
1273 pr_debug("ERROR: failed to insert value to %s[%u]\n",
1274 name, i);
1275 return err;
1276 }
1277 }
1278 return 0;
1279}
1280
1281static int
1282foreach_key_array_ranges(map_config_func_t func, void *arg,
1283 const char *name, int map_fd,
1284 const struct bpf_map_def *pdef,
1285 struct bpf_map_op *op)
1286{
1287 unsigned int i, j;
1288 int err;
1289
1290 for (i = 0; i < op->k.array.nr_ranges; i++) {
1291 unsigned int start = op->k.array.ranges[i].start;
1292 size_t length = op->k.array.ranges[i].length;
1293
1294 for (j = 0; j < length; j++) {
1295 unsigned int idx = start + j;
1296
1297 err = func(name, map_fd, pdef, op, &idx, arg);
1298 if (err) {
1299 pr_debug("ERROR: failed to insert value to %s[%u]\n",
1300 name, idx);
1301 return err;
1302 }
1303 }
1304 }
1305 return 0;
1306}
1307
1308static int
1309bpf_map_config_foreach_key(struct bpf_map *map,
1310 map_config_func_t func,
1311 void *arg)
1312{
1313 int err, map_fd;
1314 struct bpf_map_op *op;
1315 const struct bpf_map_def *def;
1316 const char *name = bpf_map__name(map);
1317 struct bpf_map_priv *priv = bpf_map__priv(map);
1318
1319 if (IS_ERR(priv)) {
1320 pr_debug("ERROR: failed to get private from map %s\n", name);
1321 return -BPF_LOADER_ERRNO__INTERNAL;
1322 }
1323 if (!priv || list_empty(&priv->ops_list)) {
1324 pr_debug("INFO: nothing to config for map %s\n", name);
1325 return 0;
1326 }
1327
1328 def = bpf_map__def(map);
1329 if (IS_ERR(def)) {
1330 pr_debug("ERROR: failed to get definition from map %s\n", name);
1331 return -BPF_LOADER_ERRNO__INTERNAL;
1332 }
1333 map_fd = bpf_map__fd(map);
1334 if (map_fd < 0) {
1335 pr_debug("ERROR: failed to get fd from map %s\n", name);
1336 return map_fd;
1337 }
1338
1339 list_for_each_entry(op, &priv->ops_list, list) {
1340 switch (def->type) {
1341 case BPF_MAP_TYPE_ARRAY:
1342 case BPF_MAP_TYPE_PERF_EVENT_ARRAY:
1343 switch (op->key_type) {
1344 case BPF_MAP_KEY_ALL:
1345 err = foreach_key_array_all(func, arg, name,
1346 map_fd, def, op);
1347 break;
1348 case BPF_MAP_KEY_RANGES:
1349 err = foreach_key_array_ranges(func, arg, name,
1350 map_fd, def,
1351 op);
1352 break;
1353 default:
1354 pr_debug("ERROR: keytype for map '%s' invalid\n",
1355 name);
1356 return -BPF_LOADER_ERRNO__INTERNAL;
1357 }
1358 if (err)
1359 return err;
1360 break;
1361 default:
1362 pr_debug("ERROR: type of '%s' incorrect\n", name);
1363 return -BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE;
1364 }
1365 }
1366
1367 return 0;
1368}
1369
1370static int
1371apply_config_value_for_key(int map_fd, void *pkey,
1372 size_t val_size, u64 val)
1373{
1374 int err = 0;
1375
1376 switch (val_size) {
1377 case 1: {
1378 u8 _val = (u8)(val);
1379 err = bpf_map_update_elem(map_fd, pkey, &_val, BPF_ANY);
1380 break;
1381 }
1382 case 2: {
1383 u16 _val = (u16)(val);
1384 err = bpf_map_update_elem(map_fd, pkey, &_val, BPF_ANY);
1385 break;
1386 }
1387 case 4: {
1388 u32 _val = (u32)(val);
1389 err = bpf_map_update_elem(map_fd, pkey, &_val, BPF_ANY);
1390 break;
1391 }
1392 case 8: {
1393 err = bpf_map_update_elem(map_fd, pkey, &val, BPF_ANY);
1394 break;
1395 }
1396 default:
1397 pr_debug("ERROR: invalid value size\n");
1398 return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUESIZE;
1399 }
1400 if (err && errno)
1401 err = -errno;
1402 return err;
1403}
1404
1405static int
1406apply_config_evsel_for_key(const char *name, int map_fd, void *pkey,
1407 struct evsel *evsel)
1408{
1409 struct xyarray *xy = evsel->core.fd;
1410 struct perf_event_attr *attr;
1411 unsigned int key, events;
1412 bool check_pass = false;
1413 int *evt_fd;
1414 int err;
1415
1416 if (!xy) {
1417 pr_debug("ERROR: evsel not ready for map %s\n", name);
1418 return -BPF_LOADER_ERRNO__INTERNAL;
1419 }
1420
1421 if (xy->row_size / xy->entry_size != 1) {
1422 pr_debug("ERROR: Dimension of target event is incorrect for map %s\n",
1423 name);
1424 return -BPF_LOADER_ERRNO__OBJCONF_MAP_EVTDIM;
1425 }
1426
1427 attr = &evsel->core.attr;
1428 if (attr->inherit) {
1429 pr_debug("ERROR: Can't put inherit event into map %s\n", name);
1430 return -BPF_LOADER_ERRNO__OBJCONF_MAP_EVTINH;
1431 }
1432
1433 if (perf_evsel__is_bpf_output(evsel))
1434 check_pass = true;
1435 if (attr->type == PERF_TYPE_RAW)
1436 check_pass = true;
1437 if (attr->type == PERF_TYPE_HARDWARE)
1438 check_pass = true;
1439 if (!check_pass) {
1440 pr_debug("ERROR: Event type is wrong for map %s\n", name);
1441 return -BPF_LOADER_ERRNO__OBJCONF_MAP_EVTTYPE;
1442 }
1443
1444 events = xy->entries / (xy->row_size / xy->entry_size);
1445 key = *((unsigned int *)pkey);
1446 if (key >= events) {
1447 pr_debug("ERROR: there is no event %d for map %s\n",
1448 key, name);
1449 return -BPF_LOADER_ERRNO__OBJCONF_MAP_MAPSIZE;
1450 }
1451 evt_fd = xyarray__entry(xy, key, 0);
1452 err = bpf_map_update_elem(map_fd, pkey, evt_fd, BPF_ANY);
1453 if (err && errno)
1454 err = -errno;
1455 return err;
1456}
1457
1458static int
1459apply_obj_config_map_for_key(const char *name, int map_fd,
1460 const struct bpf_map_def *pdef,
1461 struct bpf_map_op *op,
1462 void *pkey, void *arg __maybe_unused)
1463{
1464 int err;
1465
1466 switch (op->op_type) {
1467 case BPF_MAP_OP_SET_VALUE:
1468 err = apply_config_value_for_key(map_fd, pkey,
1469 pdef->value_size,
1470 op->v.value);
1471 break;
1472 case BPF_MAP_OP_SET_EVSEL:
1473 err = apply_config_evsel_for_key(name, map_fd, pkey,
1474 op->v.evsel);
1475 break;
1476 default:
1477 pr_debug("ERROR: unknown value type for '%s'\n", name);
1478 err = -BPF_LOADER_ERRNO__INTERNAL;
1479 }
1480 return err;
1481}
1482
1483static int
1484apply_obj_config_map(struct bpf_map *map)
1485{
1486 return bpf_map_config_foreach_key(map,
1487 apply_obj_config_map_for_key,
1488 NULL);
1489}
1490
1491static int
1492apply_obj_config_object(struct bpf_object *obj)
1493{
1494 struct bpf_map *map;
1495 int err;
1496
1497 bpf_object__for_each_map(map, obj) {
1498 err = apply_obj_config_map(map);
1499 if (err)
1500 return err;
1501 }
1502 return 0;
1503}
1504
1505int bpf__apply_obj_config(void)
1506{
1507 struct bpf_object *obj, *tmp;
1508 int err;
1509
1510 bpf_object__for_each_safe(obj, tmp) {
1511 err = apply_obj_config_object(obj);
1512 if (err)
1513 return err;
1514 }
1515
1516 return 0;
1517}
1518
1519#define bpf__for_each_map(pos, obj, objtmp) \
1520 bpf_object__for_each_safe(obj, objtmp) \
1521 bpf_object__for_each_map(pos, obj)
1522
1523#define bpf__for_each_map_named(pos, obj, objtmp, name) \
1524 bpf__for_each_map(pos, obj, objtmp) \
1525 if (bpf_map__name(pos) && \
1526 (strcmp(name, \
1527 bpf_map__name(pos)) == 0))
1528
1529struct evsel *bpf__setup_output_event(struct evlist *evlist, const char *name)
1530{
1531 struct bpf_map_priv *tmpl_priv = NULL;
1532 struct bpf_object *obj, *tmp;
1533 struct evsel *evsel = NULL;
1534 struct bpf_map *map;
1535 int err;
1536 bool need_init = false;
1537
1538 bpf__for_each_map_named(map, obj, tmp, name) {
1539 struct bpf_map_priv *priv = bpf_map__priv(map);
1540
1541 if (IS_ERR(priv))
1542 return ERR_PTR(-BPF_LOADER_ERRNO__INTERNAL);
1543
1544 /*
1545 * No need to check map type: type should have been
1546 * verified by kernel.
1547 */
1548 if (!need_init && !priv)
1549 need_init = !priv;
1550 if (!tmpl_priv && priv)
1551 tmpl_priv = priv;
1552 }
1553
1554 if (!need_init)
1555 return NULL;
1556
1557 if (!tmpl_priv) {
1558 char *event_definition = NULL;
1559
1560 if (asprintf(&event_definition, "bpf-output/no-inherit=1,name=%s/", name) < 0)
1561 return ERR_PTR(-ENOMEM);
1562
1563 err = parse_events(evlist, event_definition, NULL);
1564 free(event_definition);
1565
1566 if (err) {
1567 pr_debug("ERROR: failed to create the \"%s\" bpf-output event\n", name);
1568 return ERR_PTR(-err);
1569 }
1570
1571 evsel = evlist__last(evlist);
1572 }
1573
1574 bpf__for_each_map_named(map, obj, tmp, name) {
1575 struct bpf_map_priv *priv = bpf_map__priv(map);
1576
1577 if (IS_ERR(priv))
1578 return ERR_PTR(-BPF_LOADER_ERRNO__INTERNAL);
1579 if (priv)
1580 continue;
1581
1582 if (tmpl_priv) {
1583 priv = bpf_map_priv__clone(tmpl_priv);
1584 if (!priv)
1585 return ERR_PTR(-ENOMEM);
1586
1587 err = bpf_map__set_priv(map, priv, bpf_map_priv__clear);
1588 if (err) {
1589 bpf_map_priv__clear(map, priv);
1590 return ERR_PTR(err);
1591 }
1592 } else if (evsel) {
1593 struct bpf_map_op *op;
1594
1595 op = bpf_map__add_newop(map, NULL);
1596 if (IS_ERR(op))
1597 return ERR_CAST(op);
1598 op->op_type = BPF_MAP_OP_SET_EVSEL;
1599 op->v.evsel = evsel;
1600 }
1601 }
1602
1603 return evsel;
1604}
1605
1606int bpf__setup_stdout(struct evlist *evlist)
1607{
1608 struct evsel *evsel = bpf__setup_output_event(evlist, "__bpf_stdout__");
1609 return PTR_ERR_OR_ZERO(evsel);
1610}
1611
1612#define ERRNO_OFFSET(e) ((e) - __BPF_LOADER_ERRNO__START)
1613#define ERRCODE_OFFSET(c) ERRNO_OFFSET(BPF_LOADER_ERRNO__##c)
1614#define NR_ERRNO (__BPF_LOADER_ERRNO__END - __BPF_LOADER_ERRNO__START)
1615
1616static const char *bpf_loader_strerror_table[NR_ERRNO] = {
1617 [ERRCODE_OFFSET(CONFIG)] = "Invalid config string",
1618 [ERRCODE_OFFSET(GROUP)] = "Invalid group name",
1619 [ERRCODE_OFFSET(EVENTNAME)] = "No event name found in config string",
1620 [ERRCODE_OFFSET(INTERNAL)] = "BPF loader internal error",
1621 [ERRCODE_OFFSET(COMPILE)] = "Error when compiling BPF scriptlet",
1622 [ERRCODE_OFFSET(PROGCONF_TERM)] = "Invalid program config term in config string",
1623 [ERRCODE_OFFSET(PROLOGUE)] = "Failed to generate prologue",
1624 [ERRCODE_OFFSET(PROLOGUE2BIG)] = "Prologue too big for program",
1625 [ERRCODE_OFFSET(PROLOGUEOOB)] = "Offset out of bound for prologue",
1626 [ERRCODE_OFFSET(OBJCONF_OPT)] = "Invalid object config option",
1627 [ERRCODE_OFFSET(OBJCONF_CONF)] = "Config value not set (missing '=')",
1628 [ERRCODE_OFFSET(OBJCONF_MAP_OPT)] = "Invalid object map config option",
1629 [ERRCODE_OFFSET(OBJCONF_MAP_NOTEXIST)] = "Target map doesn't exist",
1630 [ERRCODE_OFFSET(OBJCONF_MAP_VALUE)] = "Incorrect value type for map",
1631 [ERRCODE_OFFSET(OBJCONF_MAP_TYPE)] = "Incorrect map type",
1632 [ERRCODE_OFFSET(OBJCONF_MAP_KEYSIZE)] = "Incorrect map key size",
1633 [ERRCODE_OFFSET(OBJCONF_MAP_VALUESIZE)] = "Incorrect map value size",
1634 [ERRCODE_OFFSET(OBJCONF_MAP_NOEVT)] = "Event not found for map setting",
1635 [ERRCODE_OFFSET(OBJCONF_MAP_MAPSIZE)] = "Invalid map size for event setting",
1636 [ERRCODE_OFFSET(OBJCONF_MAP_EVTDIM)] = "Event dimension too large",
1637 [ERRCODE_OFFSET(OBJCONF_MAP_EVTINH)] = "Doesn't support inherit event",
1638 [ERRCODE_OFFSET(OBJCONF_MAP_EVTTYPE)] = "Wrong event type for map",
1639 [ERRCODE_OFFSET(OBJCONF_MAP_IDX2BIG)] = "Index too large",
1640};
1641
1642static int
1643bpf_loader_strerror(int err, char *buf, size_t size)
1644{
1645 char sbuf[STRERR_BUFSIZE];
1646 const char *msg;
1647
1648 if (!buf || !size)
1649 return -1;
1650
1651 err = err > 0 ? err : -err;
1652
1653 if (err >= __LIBBPF_ERRNO__START)
1654 return libbpf_strerror(err, buf, size);
1655
1656 if (err >= __BPF_LOADER_ERRNO__START && err < __BPF_LOADER_ERRNO__END) {
1657 msg = bpf_loader_strerror_table[ERRNO_OFFSET(err)];
1658 snprintf(buf, size, "%s", msg);
1659 buf[size - 1] = '\0';
1660 return 0;
1661 }
1662
1663 if (err >= __BPF_LOADER_ERRNO__END)
1664 snprintf(buf, size, "Unknown bpf loader error %d", err);
1665 else
1666 snprintf(buf, size, "%s",
1667 str_error_r(err, sbuf, sizeof(sbuf)));
1668
1669 buf[size - 1] = '\0';
1670 return -1;
1671}
1672
1673#define bpf__strerror_head(err, buf, size) \
1674 char sbuf[STRERR_BUFSIZE], *emsg;\
1675 if (!size)\
1676 return 0;\
1677 if (err < 0)\
1678 err = -err;\
1679 bpf_loader_strerror(err, sbuf, sizeof(sbuf));\
1680 emsg = sbuf;\
1681 switch (err) {\
1682 default:\
1683 scnprintf(buf, size, "%s", emsg);\
1684 break;
1685
1686#define bpf__strerror_entry(val, fmt...)\
1687 case val: {\
1688 scnprintf(buf, size, fmt);\
1689 break;\
1690 }
1691
1692#define bpf__strerror_end(buf, size)\
1693 }\
1694 buf[size - 1] = '\0';
1695
1696int bpf__strerror_prepare_load(const char *filename, bool source,
1697 int err, char *buf, size_t size)
1698{
1699 size_t n;
1700 int ret;
1701
1702 n = snprintf(buf, size, "Failed to load %s%s: ",
1703 filename, source ? " from source" : "");
1704 if (n >= size) {
1705 buf[size - 1] = '\0';
1706 return 0;
1707 }
1708 buf += n;
1709 size -= n;
1710
1711 ret = bpf_loader_strerror(err, buf, size);
1712 buf[size - 1] = '\0';
1713 return ret;
1714}
1715
1716int bpf__strerror_probe(struct bpf_object *obj __maybe_unused,
1717 int err, char *buf, size_t size)
1718{
1719 bpf__strerror_head(err, buf, size);
1720 case BPF_LOADER_ERRNO__PROGCONF_TERM: {
1721 scnprintf(buf, size, "%s (add -v to see detail)", emsg);
1722 break;
1723 }
1724 bpf__strerror_entry(EEXIST, "Probe point exist. Try 'perf probe -d \"*\"' and set 'force=yes'");
1725 bpf__strerror_entry(EACCES, "You need to be root");
1726 bpf__strerror_entry(EPERM, "You need to be root, and /proc/sys/kernel/kptr_restrict should be 0");
1727 bpf__strerror_entry(ENOENT, "You need to check probing points in BPF file");
1728 bpf__strerror_end(buf, size);
1729 return 0;
1730}
1731
1732int bpf__strerror_load(struct bpf_object *obj,
1733 int err, char *buf, size_t size)
1734{
1735 bpf__strerror_head(err, buf, size);
1736 case LIBBPF_ERRNO__KVER: {
1737 unsigned int obj_kver = bpf_object__kversion(obj);
1738 unsigned int real_kver;
1739
1740 if (fetch_kernel_version(&real_kver, NULL, 0)) {
1741 scnprintf(buf, size, "Unable to fetch kernel version");
1742 break;
1743 }
1744
1745 if (obj_kver != real_kver) {
1746 scnprintf(buf, size,
1747 "'version' ("KVER_FMT") doesn't match running kernel ("KVER_FMT")",
1748 KVER_PARAM(obj_kver),
1749 KVER_PARAM(real_kver));
1750 break;
1751 }
1752
1753 scnprintf(buf, size, "Failed to load program for unknown reason");
1754 break;
1755 }
1756 bpf__strerror_end(buf, size);
1757 return 0;
1758}
1759
1760int bpf__strerror_config_obj(struct bpf_object *obj __maybe_unused,
1761 struct parse_events_term *term __maybe_unused,
1762 struct evlist *evlist __maybe_unused,
1763 int *error_pos __maybe_unused, int err,
1764 char *buf, size_t size)
1765{
1766 bpf__strerror_head(err, buf, size);
1767 bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE,
1768 "Can't use this config term with this map type");
1769 bpf__strerror_end(buf, size);
1770 return 0;
1771}
1772
1773int bpf__strerror_apply_obj_config(int err, char *buf, size_t size)
1774{
1775 bpf__strerror_head(err, buf, size);
1776 bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_EVTDIM,
1777 "Cannot set event to BPF map in multi-thread tracing");
1778 bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_EVTINH,
1779 "%s (Hint: use -i to turn off inherit)", emsg);
1780 bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_EVTTYPE,
1781 "Can only put raw, hardware and BPF output event into a BPF map");
1782 bpf__strerror_end(buf, size);
1783 return 0;
1784}
1785
1786int bpf__strerror_setup_output_event(struct evlist *evlist __maybe_unused,
1787 int err, char *buf, size_t size)
1788{
1789 bpf__strerror_head(err, buf, size);
1790 bpf__strerror_end(buf, size);
1791 return 0;
1792}