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12#include <errno.h>
13#include <sys/param.h>
14#include "cache.h"
15#include "callchain.h"
16#include <subcmd/exec-cmd.h>
17#include "util/event.h"
18#include "util/hist.h"
19#include "util/llvm-utils.h"
20#include "util/stat.h"
21#include "util/evsel.h"
22#include "build-id.h"
23#include "debug.h"
24#include "config.h"
25#include <sys/types.h>
26#include <sys/stat.h>
27#include <stdlib.h>
28#include <unistd.h>
29#include <linux/string.h>
30#include <linux/zalloc.h>
31#include <linux/ctype.h>
32
33#define MAXNAME (256)
34
35#define DEBUG_CACHE_DIR ".debug"
36
37
38char buildid_dir[MAXPATHLEN];
39
40static FILE *config_file;
41static const char *config_file_name;
42static int config_linenr;
43static int config_file_eof;
44static struct perf_config_set *config_set;
45
46const char *config_exclusive_filename;
47
48static int get_next_char(void)
49{
50 int c;
51 FILE *f;
52
53 c = '\n';
54 if ((f = config_file) != NULL) {
55 c = fgetc(f);
56 if (c == '\r') {
57
58 c = fgetc(f);
59 if (c != '\n') {
60 ungetc(c, f);
61 c = '\r';
62 }
63 }
64 if (c == '\n')
65 config_linenr++;
66 if (c == EOF) {
67 config_file_eof = 1;
68 c = '\n';
69 }
70 }
71 return c;
72}
73
74static char *parse_value(void)
75{
76 static char value[1024];
77 int quote = 0, comment = 0, space = 0;
78 size_t len = 0;
79
80 for (;;) {
81 int c = get_next_char();
82
83 if (len >= sizeof(value) - 1)
84 return NULL;
85 if (c == '\n') {
86 if (quote)
87 return NULL;
88 value[len] = 0;
89 return value;
90 }
91 if (comment)
92 continue;
93 if (isspace(c) && !quote) {
94 space = 1;
95 continue;
96 }
97 if (!quote) {
98 if (c == ';' || c == '#') {
99 comment = 1;
100 continue;
101 }
102 }
103 if (space) {
104 if (len)
105 value[len++] = ' ';
106 space = 0;
107 }
108 if (c == '\\') {
109 c = get_next_char();
110 switch (c) {
111 case '\n':
112 continue;
113 case 't':
114 c = '\t';
115 break;
116 case 'b':
117 c = '\b';
118 break;
119 case 'n':
120 c = '\n';
121 break;
122
123 case '\\': case '"':
124 break;
125
126 default:
127 return NULL;
128 }
129 value[len++] = c;
130 continue;
131 }
132 if (c == '"') {
133 quote = 1-quote;
134 continue;
135 }
136 value[len++] = c;
137 }
138}
139
140static inline int iskeychar(int c)
141{
142 return isalnum(c) || c == '-' || c == '_';
143}
144
145static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
146{
147 int c;
148 char *value;
149
150
151 for (;;) {
152 c = get_next_char();
153 if (config_file_eof)
154 break;
155 if (!iskeychar(c))
156 break;
157 name[len++] = c;
158 if (len >= MAXNAME)
159 return -1;
160 }
161 name[len] = 0;
162 while (c == ' ' || c == '\t')
163 c = get_next_char();
164
165 value = NULL;
166 if (c != '\n') {
167 if (c != '=')
168 return -1;
169 value = parse_value();
170 if (!value)
171 return -1;
172 }
173 return fn(name, value, data);
174}
175
176static int get_extended_base_var(char *name, int baselen, int c)
177{
178 do {
179 if (c == '\n')
180 return -1;
181 c = get_next_char();
182 } while (isspace(c));
183
184
185 if (c != '"')
186 return -1;
187 name[baselen++] = '.';
188
189 for (;;) {
190 int ch = get_next_char();
191
192 if (ch == '\n')
193 return -1;
194 if (ch == '"')
195 break;
196 if (ch == '\\') {
197 ch = get_next_char();
198 if (ch == '\n')
199 return -1;
200 }
201 name[baselen++] = ch;
202 if (baselen > MAXNAME / 2)
203 return -1;
204 }
205
206
207 if (get_next_char() != ']')
208 return -1;
209 return baselen;
210}
211
212static int get_base_var(char *name)
213{
214 int baselen = 0;
215
216 for (;;) {
217 int c = get_next_char();
218 if (config_file_eof)
219 return -1;
220 if (c == ']')
221 return baselen;
222 if (isspace(c))
223 return get_extended_base_var(name, baselen, c);
224 if (!iskeychar(c) && c != '.')
225 return -1;
226 if (baselen > MAXNAME / 2)
227 return -1;
228 name[baselen++] = tolower(c);
229 }
230}
231
232static int perf_parse_file(config_fn_t fn, void *data)
233{
234 int comment = 0;
235 int baselen = 0;
236 static char var[MAXNAME];
237
238
239 static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
240 const unsigned char *bomptr = utf8_bom;
241
242 for (;;) {
243 int line, c = get_next_char();
244
245 if (bomptr && *bomptr) {
246
247
248
249 if ((unsigned char) c == *bomptr) {
250 bomptr++;
251 continue;
252 } else {
253
254 if (bomptr != utf8_bom)
255 break;
256
257 bomptr = NULL;
258 }
259 }
260 if (c == '\n') {
261 if (config_file_eof)
262 return 0;
263 comment = 0;
264 continue;
265 }
266 if (comment || isspace(c))
267 continue;
268 if (c == '#' || c == ';') {
269 comment = 1;
270 continue;
271 }
272 if (c == '[') {
273 baselen = get_base_var(var);
274 if (baselen <= 0)
275 break;
276 var[baselen++] = '.';
277 var[baselen] = 0;
278 continue;
279 }
280 if (!isalpha(c))
281 break;
282 var[baselen] = tolower(c);
283
284
285
286
287
288 line = config_linenr;
289 if (get_value(fn, data, var, baselen+1) < 0) {
290 config_linenr = line;
291 break;
292 }
293 }
294 pr_err("bad config file line %d in %s\n", config_linenr, config_file_name);
295 return -1;
296}
297
298static int parse_unit_factor(const char *end, unsigned long *val)
299{
300 if (!*end)
301 return 1;
302 else if (!strcasecmp(end, "k")) {
303 *val *= 1024;
304 return 1;
305 }
306 else if (!strcasecmp(end, "m")) {
307 *val *= 1024 * 1024;
308 return 1;
309 }
310 else if (!strcasecmp(end, "g")) {
311 *val *= 1024 * 1024 * 1024;
312 return 1;
313 }
314 return 0;
315}
316
317static int perf_parse_llong(const char *value, long long *ret)
318{
319 if (value && *value) {
320 char *end;
321 long long val = strtoll(value, &end, 0);
322 unsigned long factor = 1;
323
324 if (!parse_unit_factor(end, &factor))
325 return 0;
326 *ret = val * factor;
327 return 1;
328 }
329 return 0;
330}
331
332static int perf_parse_long(const char *value, long *ret)
333{
334 if (value && *value) {
335 char *end;
336 long val = strtol(value, &end, 0);
337 unsigned long factor = 1;
338 if (!parse_unit_factor(end, &factor))
339 return 0;
340 *ret = val * factor;
341 return 1;
342 }
343 return 0;
344}
345
346static void bad_config(const char *name)
347{
348 if (config_file_name)
349 pr_warning("bad config value for '%s' in %s, ignoring...\n", name, config_file_name);
350 else
351 pr_warning("bad config value for '%s', ignoring...\n", name);
352}
353
354int perf_config_u64(u64 *dest, const char *name, const char *value)
355{
356 long long ret = 0;
357
358 if (!perf_parse_llong(value, &ret)) {
359 bad_config(name);
360 return -1;
361 }
362
363 *dest = ret;
364 return 0;
365}
366
367int perf_config_int(int *dest, const char *name, const char *value)
368{
369 long ret = 0;
370 if (!perf_parse_long(value, &ret)) {
371 bad_config(name);
372 return -1;
373 }
374 *dest = ret;
375 return 0;
376}
377
378int perf_config_u8(u8 *dest, const char *name, const char *value)
379{
380 long ret = 0;
381
382 if (!perf_parse_long(value, &ret)) {
383 bad_config(name);
384 return -1;
385 }
386 *dest = ret;
387 return 0;
388}
389
390static int perf_config_bool_or_int(const char *name, const char *value, int *is_bool)
391{
392 int ret;
393
394 *is_bool = 1;
395 if (!value)
396 return 1;
397 if (!*value)
398 return 0;
399 if (!strcasecmp(value, "true") || !strcasecmp(value, "yes") || !strcasecmp(value, "on"))
400 return 1;
401 if (!strcasecmp(value, "false") || !strcasecmp(value, "no") || !strcasecmp(value, "off"))
402 return 0;
403 *is_bool = 0;
404 return perf_config_int(&ret, name, value) < 0 ? -1 : ret;
405}
406
407int perf_config_bool(const char *name, const char *value)
408{
409 int discard;
410 return !!perf_config_bool_or_int(name, value, &discard);
411}
412
413static const char *perf_config_dirname(const char *name, const char *value)
414{
415 if (!name)
416 return NULL;
417 return value;
418}
419
420static int perf_buildid_config(const char *var, const char *value)
421{
422
423 if (!strcmp(var, "buildid.dir")) {
424 const char *dir = perf_config_dirname(var, value);
425
426 if (!dir) {
427 pr_err("Invalid buildid directory!\n");
428 return -1;
429 }
430 strncpy(buildid_dir, dir, MAXPATHLEN-1);
431 buildid_dir[MAXPATHLEN-1] = '\0';
432 }
433
434 return 0;
435}
436
437static int perf_default_core_config(const char *var __maybe_unused,
438 const char *value __maybe_unused)
439{
440 if (!strcmp(var, "core.proc-map-timeout"))
441 proc_map_timeout = strtoul(value, NULL, 10);
442
443
444 return 0;
445}
446
447static int perf_ui_config(const char *var, const char *value)
448{
449
450 if (!strcmp(var, "ui.show-headers"))
451 symbol_conf.show_hist_headers = perf_config_bool(var, value);
452
453 return 0;
454}
455
456static int perf_stat_config(const char *var, const char *value)
457{
458 if (!strcmp(var, "stat.big-num"))
459 perf_stat__set_big_num(perf_config_bool(var, value));
460
461 if (!strcmp(var, "stat.no-csv-summary"))
462 perf_stat__set_no_csv_summary(perf_config_bool(var, value));
463
464 if (!strcmp(var, "stat.bpf-counter-events"))
465 evsel__bpf_counter_events = strdup(value);
466
467
468 return 0;
469}
470
471int perf_default_config(const char *var, const char *value,
472 void *dummy __maybe_unused)
473{
474 if (strstarts(var, "core."))
475 return perf_default_core_config(var, value);
476
477 if (strstarts(var, "hist."))
478 return perf_hist_config(var, value);
479
480 if (strstarts(var, "ui."))
481 return perf_ui_config(var, value);
482
483 if (strstarts(var, "call-graph."))
484 return perf_callchain_config(var, value);
485
486 if (strstarts(var, "llvm."))
487 return perf_llvm_config(var, value);
488
489 if (strstarts(var, "buildid."))
490 return perf_buildid_config(var, value);
491
492 if (strstarts(var, "stat."))
493 return perf_stat_config(var, value);
494
495
496 return 0;
497}
498
499static int perf_config_from_file(config_fn_t fn, const char *filename, void *data)
500{
501 int ret;
502 FILE *f = fopen(filename, "r");
503
504 ret = -1;
505 if (f) {
506 config_file = f;
507 config_file_name = filename;
508 config_linenr = 1;
509 config_file_eof = 0;
510 ret = perf_parse_file(fn, data);
511 fclose(f);
512 config_file_name = NULL;
513 }
514 return ret;
515}
516
517const char *perf_etc_perfconfig(void)
518{
519 static const char *system_wide;
520 if (!system_wide)
521 system_wide = system_path(ETC_PERFCONFIG);
522 return system_wide;
523}
524
525static int perf_env_bool(const char *k, int def)
526{
527 const char *v = getenv(k);
528 return v ? perf_config_bool(k, v) : def;
529}
530
531int perf_config_system(void)
532{
533 return !perf_env_bool("PERF_CONFIG_NOSYSTEM", 0);
534}
535
536int perf_config_global(void)
537{
538 return !perf_env_bool("PERF_CONFIG_NOGLOBAL", 0);
539}
540
541static char *home_perfconfig(void)
542{
543 const char *home = NULL;
544 char *config;
545 struct stat st;
546
547 home = getenv("HOME");
548
549
550
551
552
553
554 if (!home || !*home || !perf_config_global())
555 return NULL;
556
557 config = strdup(mkpath("%s/.perfconfig", home));
558 if (config == NULL) {
559 pr_warning("Not enough memory to process %s/.perfconfig, ignoring it.", home);
560 return NULL;
561 }
562
563 if (stat(config, &st) < 0)
564 goto out_free;
565
566 if (st.st_uid && (st.st_uid != geteuid())) {
567 pr_warning("File %s not owned by current user or root, ignoring it.", config);
568 goto out_free;
569 }
570
571 if (st.st_size)
572 return config;
573
574out_free:
575 free(config);
576 return NULL;
577}
578
579const char *perf_home_perfconfig(void)
580{
581 static const char *config;
582 static bool failed;
583
584 config = failed ? NULL : home_perfconfig();
585 if (!config)
586 failed = true;
587
588 return config;
589}
590
591static struct perf_config_section *find_section(struct list_head *sections,
592 const char *section_name)
593{
594 struct perf_config_section *section;
595
596 list_for_each_entry(section, sections, node)
597 if (!strcmp(section->name, section_name))
598 return section;
599
600 return NULL;
601}
602
603static struct perf_config_item *find_config_item(const char *name,
604 struct perf_config_section *section)
605{
606 struct perf_config_item *item;
607
608 list_for_each_entry(item, §ion->items, node)
609 if (!strcmp(item->name, name))
610 return item;
611
612 return NULL;
613}
614
615static struct perf_config_section *add_section(struct list_head *sections,
616 const char *section_name)
617{
618 struct perf_config_section *section = zalloc(sizeof(*section));
619
620 if (!section)
621 return NULL;
622
623 INIT_LIST_HEAD(§ion->items);
624 section->name = strdup(section_name);
625 if (!section->name) {
626 pr_debug("%s: strdup failed\n", __func__);
627 free(section);
628 return NULL;
629 }
630
631 list_add_tail(§ion->node, sections);
632 return section;
633}
634
635static struct perf_config_item *add_config_item(struct perf_config_section *section,
636 const char *name)
637{
638 struct perf_config_item *item = zalloc(sizeof(*item));
639
640 if (!item)
641 return NULL;
642
643 item->name = strdup(name);
644 if (!item->name) {
645 pr_debug("%s: strdup failed\n", __func__);
646 free(item);
647 return NULL;
648 }
649
650 list_add_tail(&item->node, §ion->items);
651 return item;
652}
653
654static int set_value(struct perf_config_item *item, const char *value)
655{
656 char *val = strdup(value);
657
658 if (!val)
659 return -1;
660
661 zfree(&item->value);
662 item->value = val;
663 return 0;
664}
665
666static int collect_config(const char *var, const char *value,
667 void *perf_config_set)
668{
669 int ret = -1;
670 char *ptr, *key;
671 char *section_name, *name;
672 struct perf_config_section *section = NULL;
673 struct perf_config_item *item = NULL;
674 struct perf_config_set *set = perf_config_set;
675 struct list_head *sections;
676
677 if (set == NULL)
678 return -1;
679
680 sections = &set->sections;
681 key = ptr = strdup(var);
682 if (!key) {
683 pr_debug("%s: strdup failed\n", __func__);
684 return -1;
685 }
686
687 section_name = strsep(&ptr, ".");
688 name = ptr;
689 if (name == NULL || value == NULL)
690 goto out_free;
691
692 section = find_section(sections, section_name);
693 if (!section) {
694 section = add_section(sections, section_name);
695 if (!section)
696 goto out_free;
697 }
698
699 item = find_config_item(name, section);
700 if (!item) {
701 item = add_config_item(section, name);
702 if (!item)
703 goto out_free;
704 }
705
706
707
708
709
710
711 if (strcmp(config_file_name, perf_etc_perfconfig()) == 0) {
712 section->from_system_config = true;
713 item->from_system_config = true;
714 } else {
715 section->from_system_config = false;
716 item->from_system_config = false;
717 }
718
719 ret = set_value(item, value);
720
721out_free:
722 free(key);
723 return ret;
724}
725
726int perf_config_set__collect(struct perf_config_set *set, const char *file_name,
727 const char *var, const char *value)
728{
729 config_file_name = file_name;
730 return collect_config(var, value, set);
731}
732
733static int perf_config_set__init(struct perf_config_set *set)
734{
735 int ret = -1;
736
737
738 if (config_exclusive_filename)
739 return perf_config_from_file(collect_config, config_exclusive_filename, set);
740 if (perf_config_system() && !access(perf_etc_perfconfig(), R_OK)) {
741 if (perf_config_from_file(collect_config, perf_etc_perfconfig(), set) < 0)
742 goto out;
743 }
744 if (perf_config_global() && perf_home_perfconfig()) {
745 if (perf_config_from_file(collect_config, perf_home_perfconfig(), set) < 0)
746 goto out;
747 }
748
749out:
750 return ret;
751}
752
753struct perf_config_set *perf_config_set__new(void)
754{
755 struct perf_config_set *set = zalloc(sizeof(*set));
756
757 if (set) {
758 INIT_LIST_HEAD(&set->sections);
759 perf_config_set__init(set);
760 }
761
762 return set;
763}
764
765struct perf_config_set *perf_config_set__load_file(const char *file)
766{
767 struct perf_config_set *set = zalloc(sizeof(*set));
768
769 if (set) {
770 INIT_LIST_HEAD(&set->sections);
771 perf_config_from_file(collect_config, file, set);
772 }
773
774 return set;
775}
776
777static int perf_config__init(void)
778{
779 if (config_set == NULL)
780 config_set = perf_config_set__new();
781
782 return config_set == NULL;
783}
784
785int perf_config_set(struct perf_config_set *set,
786 config_fn_t fn, void *data)
787{
788 int ret = 0;
789 char key[BUFSIZ];
790 struct perf_config_section *section;
791 struct perf_config_item *item;
792
793 perf_config_set__for_each_entry(set, section, item) {
794 char *value = item->value;
795
796 if (value) {
797 scnprintf(key, sizeof(key), "%s.%s",
798 section->name, item->name);
799 ret = fn(key, value, data);
800 if (ret < 0) {
801 pr_err("Error: wrong config key-value pair %s=%s\n",
802 key, value);
803
804
805
806
807 goto out;
808 }
809 }
810 }
811out:
812 return ret;
813}
814
815int perf_config(config_fn_t fn, void *data)
816{
817 if (config_set == NULL && perf_config__init())
818 return -1;
819
820 return perf_config_set(config_set, fn, data);
821}
822
823void perf_config__exit(void)
824{
825 perf_config_set__delete(config_set);
826 config_set = NULL;
827}
828
829void perf_config__refresh(void)
830{
831 perf_config__exit();
832 perf_config__init();
833}
834
835static void perf_config_item__delete(struct perf_config_item *item)
836{
837 zfree(&item->name);
838 zfree(&item->value);
839 free(item);
840}
841
842static void perf_config_section__purge(struct perf_config_section *section)
843{
844 struct perf_config_item *item, *tmp;
845
846 list_for_each_entry_safe(item, tmp, §ion->items, node) {
847 list_del_init(&item->node);
848 perf_config_item__delete(item);
849 }
850}
851
852static void perf_config_section__delete(struct perf_config_section *section)
853{
854 perf_config_section__purge(section);
855 zfree(§ion->name);
856 free(section);
857}
858
859static void perf_config_set__purge(struct perf_config_set *set)
860{
861 struct perf_config_section *section, *tmp;
862
863 list_for_each_entry_safe(section, tmp, &set->sections, node) {
864 list_del_init(§ion->node);
865 perf_config_section__delete(section);
866 }
867}
868
869void perf_config_set__delete(struct perf_config_set *set)
870{
871 if (set == NULL)
872 return;
873
874 perf_config_set__purge(set);
875 free(set);
876}
877
878
879
880
881
882int config_error_nonbool(const char *var)
883{
884 pr_err("Missing value for '%s'", var);
885 return -1;
886}
887
888void set_buildid_dir(const char *dir)
889{
890 if (dir)
891 scnprintf(buildid_dir, MAXPATHLEN, "%s", dir);
892
893
894 if (buildid_dir[0] == '\0') {
895 char *home = getenv("HOME");
896
897 if (home) {
898 snprintf(buildid_dir, MAXPATHLEN, "%s/%s",
899 home, DEBUG_CACHE_DIR);
900 } else {
901 strncpy(buildid_dir, DEBUG_CACHE_DIR, MAXPATHLEN-1);
902 }
903 buildid_dir[MAXPATHLEN-1] = '\0';
904 }
905
906 setenv("PERF_BUILDID_DIR", buildid_dir, 1);
907}
908
