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