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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 "build-id.h"
21#include "debug.h"
22#include "config.h"
23#include "debug.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
455int perf_default_config(const char *var, const char *value,
456 void *dummy __maybe_unused)
457{
458 if (strstarts(var, "core."))
459 return perf_default_core_config(var, value);
460
461 if (strstarts(var, "hist."))
462 return perf_hist_config(var, value);
463
464 if (strstarts(var, "ui."))
465 return perf_ui_config(var, value);
466
467 if (strstarts(var, "call-graph."))
468 return perf_callchain_config(var, value);
469
470 if (strstarts(var, "llvm."))
471 return perf_llvm_config(var, value);
472
473 if (strstarts(var, "buildid."))
474 return perf_buildid_config(var, value);
475
476
477 return 0;
478}
479
480static int perf_config_from_file(config_fn_t fn, const char *filename, void *data)
481{
482 int ret;
483 FILE *f = fopen(filename, "r");
484
485 ret = -1;
486 if (f) {
487 config_file = f;
488 config_file_name = filename;
489 config_linenr = 1;
490 config_file_eof = 0;
491 ret = perf_parse_file(fn, data);
492 fclose(f);
493 config_file_name = NULL;
494 }
495 return ret;
496}
497
498const char *perf_etc_perfconfig(void)
499{
500 static const char *system_wide;
501 if (!system_wide)
502 system_wide = system_path(ETC_PERFCONFIG);
503 return system_wide;
504}
505
506static int perf_env_bool(const char *k, int def)
507{
508 const char *v = getenv(k);
509 return v ? perf_config_bool(k, v) : def;
510}
511
512static int perf_config_system(void)
513{
514 return !perf_env_bool("PERF_CONFIG_NOSYSTEM", 0);
515}
516
517static int perf_config_global(void)
518{
519 return !perf_env_bool("PERF_CONFIG_NOGLOBAL", 0);
520}
521
522static struct perf_config_section *find_section(struct list_head *sections,
523 const char *section_name)
524{
525 struct perf_config_section *section;
526
527 list_for_each_entry(section, sections, node)
528 if (!strcmp(section->name, section_name))
529 return section;
530
531 return NULL;
532}
533
534static struct perf_config_item *find_config_item(const char *name,
535 struct perf_config_section *section)
536{
537 struct perf_config_item *item;
538
539 list_for_each_entry(item, §ion->items, node)
540 if (!strcmp(item->name, name))
541 return item;
542
543 return NULL;
544}
545
546static struct perf_config_section *add_section(struct list_head *sections,
547 const char *section_name)
548{
549 struct perf_config_section *section = zalloc(sizeof(*section));
550
551 if (!section)
552 return NULL;
553
554 INIT_LIST_HEAD(§ion->items);
555 section->name = strdup(section_name);
556 if (!section->name) {
557 pr_debug("%s: strdup failed\n", __func__);
558 free(section);
559 return NULL;
560 }
561
562 list_add_tail(§ion->node, sections);
563 return section;
564}
565
566static struct perf_config_item *add_config_item(struct perf_config_section *section,
567 const char *name)
568{
569 struct perf_config_item *item = zalloc(sizeof(*item));
570
571 if (!item)
572 return NULL;
573
574 item->name = strdup(name);
575 if (!item->name) {
576 pr_debug("%s: strdup failed\n", __func__);
577 free(item);
578 return NULL;
579 }
580
581 list_add_tail(&item->node, §ion->items);
582 return item;
583}
584
585static int set_value(struct perf_config_item *item, const char *value)
586{
587 char *val = strdup(value);
588
589 if (!val)
590 return -1;
591
592 zfree(&item->value);
593 item->value = val;
594 return 0;
595}
596
597static int collect_config(const char *var, const char *value,
598 void *perf_config_set)
599{
600 int ret = -1;
601 char *ptr, *key;
602 char *section_name, *name;
603 struct perf_config_section *section = NULL;
604 struct perf_config_item *item = NULL;
605 struct perf_config_set *set = perf_config_set;
606 struct list_head *sections;
607
608 if (set == NULL)
609 return -1;
610
611 sections = &set->sections;
612 key = ptr = strdup(var);
613 if (!key) {
614 pr_debug("%s: strdup failed\n", __func__);
615 return -1;
616 }
617
618 section_name = strsep(&ptr, ".");
619 name = ptr;
620 if (name == NULL || value == NULL)
621 goto out_free;
622
623 section = find_section(sections, section_name);
624 if (!section) {
625 section = add_section(sections, section_name);
626 if (!section)
627 goto out_free;
628 }
629
630 item = find_config_item(name, section);
631 if (!item) {
632 item = add_config_item(section, name);
633 if (!item)
634 goto out_free;
635 }
636
637
638
639
640
641
642 if (strcmp(config_file_name, perf_etc_perfconfig()) == 0) {
643 section->from_system_config = true;
644 item->from_system_config = true;
645 } else {
646 section->from_system_config = false;
647 item->from_system_config = false;
648 }
649
650 ret = set_value(item, value);
651
652out_free:
653 free(key);
654 return ret;
655}
656
657int perf_config_set__collect(struct perf_config_set *set, const char *file_name,
658 const char *var, const char *value)
659{
660 config_file_name = file_name;
661 return collect_config(var, value, set);
662}
663
664static int perf_config_set__init(struct perf_config_set *set)
665{
666 int ret = -1;
667 const char *home = NULL;
668 char *user_config;
669 struct stat st;
670
671
672 if (config_exclusive_filename)
673 return perf_config_from_file(collect_config, config_exclusive_filename, set);
674 if (perf_config_system() && !access(perf_etc_perfconfig(), R_OK)) {
675 if (perf_config_from_file(collect_config, perf_etc_perfconfig(), set) < 0)
676 goto out;
677 }
678
679 home = getenv("HOME");
680
681
682
683
684
685
686 if (!home || !*home || !perf_config_global())
687 return 0;
688
689 user_config = strdup(mkpath("%s/.perfconfig", home));
690 if (user_config == NULL) {
691 pr_warning("Not enough memory to process %s/.perfconfig, ignoring it.", home);
692 goto out;
693 }
694
695 if (stat(user_config, &st) < 0) {
696 if (errno == ENOENT)
697 ret = 0;
698 goto out_free;
699 }
700
701 ret = 0;
702
703 if (st.st_uid && (st.st_uid != geteuid())) {
704 pr_warning("File %s not owned by current user or root, ignoring it.", user_config);
705 goto out_free;
706 }
707
708 if (st.st_size)
709 ret = perf_config_from_file(collect_config, user_config, set);
710
711out_free:
712 free(user_config);
713out:
714 return ret;
715}
716
717struct perf_config_set *perf_config_set__new(void)
718{
719 struct perf_config_set *set = zalloc(sizeof(*set));
720
721 if (set) {
722 INIT_LIST_HEAD(&set->sections);
723 perf_config_set__init(set);
724 }
725
726 return set;
727}
728
729static int perf_config__init(void)
730{
731 if (config_set == NULL)
732 config_set = perf_config_set__new();
733
734 return config_set == NULL;
735}
736
737int perf_config(config_fn_t fn, void *data)
738{
739 int ret = 0;
740 char key[BUFSIZ];
741 struct perf_config_section *section;
742 struct perf_config_item *item;
743
744 if (config_set == NULL && perf_config__init())
745 return -1;
746
747 perf_config_set__for_each_entry(config_set, section, item) {
748 char *value = item->value;
749
750 if (value) {
751 scnprintf(key, sizeof(key), "%s.%s",
752 section->name, item->name);
753 ret = fn(key, value, data);
754 if (ret < 0) {
755 pr_err("Error: wrong config key-value pair %s=%s\n",
756 key, value);
757
758
759
760
761 goto out;
762 }
763 }
764 }
765out:
766 return ret;
767}
768
769void perf_config__exit(void)
770{
771 perf_config_set__delete(config_set);
772 config_set = NULL;
773}
774
775void perf_config__refresh(void)
776{
777 perf_config__exit();
778 perf_config__init();
779}
780
781static void perf_config_item__delete(struct perf_config_item *item)
782{
783 zfree(&item->name);
784 zfree(&item->value);
785 free(item);
786}
787
788static void perf_config_section__purge(struct perf_config_section *section)
789{
790 struct perf_config_item *item, *tmp;
791
792 list_for_each_entry_safe(item, tmp, §ion->items, node) {
793 list_del_init(&item->node);
794 perf_config_item__delete(item);
795 }
796}
797
798static void perf_config_section__delete(struct perf_config_section *section)
799{
800 perf_config_section__purge(section);
801 zfree(§ion->name);
802 free(section);
803}
804
805static void perf_config_set__purge(struct perf_config_set *set)
806{
807 struct perf_config_section *section, *tmp;
808
809 list_for_each_entry_safe(section, tmp, &set->sections, node) {
810 list_del_init(§ion->node);
811 perf_config_section__delete(section);
812 }
813}
814
815void perf_config_set__delete(struct perf_config_set *set)
816{
817 if (set == NULL)
818 return;
819
820 perf_config_set__purge(set);
821 free(set);
822}
823
824
825
826
827
828int config_error_nonbool(const char *var)
829{
830 pr_err("Missing value for '%s'", var);
831 return -1;
832}
833
834void set_buildid_dir(const char *dir)
835{
836 if (dir)
837 scnprintf(buildid_dir, MAXPATHLEN, "%s", dir);
838
839
840 if (buildid_dir[0] == '\0') {
841 char *home = getenv("HOME");
842
843 if (home) {
844 snprintf(buildid_dir, MAXPATHLEN, "%s/%s",
845 home, DEBUG_CACHE_DIR);
846 } else {
847 strncpy(buildid_dir, DEBUG_CACHE_DIR, MAXPATHLEN-1);
848 }
849 buildid_dir[MAXPATHLEN-1] = '\0';
850 }
851
852 setenv("PERF_BUILDID_DIR", buildid_dir, 1);
853}
854
