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