1
2
3
4
5
6
7
8
9
10
11
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 "config.h"
21#include <sys/types.h>
22#include <sys/stat.h>
23#include <unistd.h>
24#include <linux/string.h>
25#include <linux/zalloc.h>
26#include <linux/ctype.h>
27
28#define MAXNAME (256)
29
30#define DEBUG_CACHE_DIR ".debug"
31
32
33char buildid_dir[MAXPATHLEN];
34
35static FILE *config_file;
36static const char *config_file_name;
37static int config_linenr;
38static int config_file_eof;
39static struct perf_config_set *config_set;
40
41const char *config_exclusive_filename;
42
43static int get_next_char(void)
44{
45 int c;
46 FILE *f;
47
48 c = '\n';
49 if ((f = config_file) != NULL) {
50 c = fgetc(f);
51 if (c == '\r') {
52
53 c = fgetc(f);
54 if (c != '\n') {
55 ungetc(c, f);
56 c = '\r';
57 }
58 }
59 if (c == '\n')
60 config_linenr++;
61 if (c == EOF) {
62 config_file_eof = 1;
63 c = '\n';
64 }
65 }
66 return c;
67}
68
69static char *parse_value(void)
70{
71 static char value[1024];
72 int quote = 0, comment = 0, space = 0;
73 size_t len = 0;
74
75 for (;;) {
76 int c = get_next_char();
77
78 if (len >= sizeof(value) - 1)
79 return NULL;
80 if (c == '\n') {
81 if (quote)
82 return NULL;
83 value[len] = 0;
84 return value;
85 }
86 if (comment)
87 continue;
88 if (isspace(c) && !quote) {
89 space = 1;
90 continue;
91 }
92 if (!quote) {
93 if (c == ';' || c == '#') {
94 comment = 1;
95 continue;
96 }
97 }
98 if (space) {
99 if (len)
100 value[len++] = ' ';
101 space = 0;
102 }
103 if (c == '\\') {
104 c = get_next_char();
105 switch (c) {
106 case '\n':
107 continue;
108 case 't':
109 c = '\t';
110 break;
111 case 'b':
112 c = '\b';
113 break;
114 case 'n':
115 c = '\n';
116 break;
117
118 case '\\': case '"':
119 break;
120
121 default:
122 return NULL;
123 }
124 value[len++] = c;
125 continue;
126 }
127 if (c == '"') {
128 quote = 1-quote;
129 continue;
130 }
131 value[len++] = c;
132 }
133}
134
135static inline int iskeychar(int c)
136{
137 return isalnum(c) || c == '-' || c == '_';
138}
139
140static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
141{
142 int c;
143 char *value;
144
145
146 for (;;) {
147 c = get_next_char();
148 if (config_file_eof)
149 break;
150 if (!iskeychar(c))
151 break;
152 name[len++] = c;
153 if (len >= MAXNAME)
154 return -1;
155 }
156 name[len] = 0;
157 while (c == ' ' || c == '\t')
158 c = get_next_char();
159
160 value = NULL;
161 if (c != '\n') {
162 if (c != '=')
163 return -1;
164 value = parse_value();
165 if (!value)
166 return -1;
167 }
168 return fn(name, value, data);
169}
170
171static int get_extended_base_var(char *name, int baselen, int c)
172{
173 do {
174 if (c == '\n')
175 return -1;
176 c = get_next_char();
177 } while (isspace(c));
178
179
180 if (c != '"')
181 return -1;
182 name[baselen++] = '.';
183
184 for (;;) {
185 int ch = get_next_char();
186
187 if (ch == '\n')
188 return -1;
189 if (ch == '"')
190 break;
191 if (ch == '\\') {
192 ch = get_next_char();
193 if (ch == '\n')
194 return -1;
195 }
196 name[baselen++] = ch;
197 if (baselen > MAXNAME / 2)
198 return -1;
199 }
200
201
202 if (get_next_char() != ']')
203 return -1;
204 return baselen;
205}
206
207static int get_base_var(char *name)
208{
209 int baselen = 0;
210
211 for (;;) {
212 int c = get_next_char();
213 if (config_file_eof)
214 return -1;
215 if (c == ']')
216 return baselen;
217 if (isspace(c))
218 return get_extended_base_var(name, baselen, c);
219 if (!iskeychar(c) && c != '.')
220 return -1;
221 if (baselen > MAXNAME / 2)
222 return -1;
223 name[baselen++] = tolower(c);
224 }
225}
226
227static int perf_parse_file(config_fn_t fn, void *data)
228{
229 int comment = 0;
230 int baselen = 0;
231 static char var[MAXNAME];
232
233
234 static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
235 const unsigned char *bomptr = utf8_bom;
236
237 for (;;) {
238 int line, c = get_next_char();
239
240 if (bomptr && *bomptr) {
241
242
243
244 if ((unsigned char) c == *bomptr) {
245 bomptr++;
246 continue;
247 } else {
248
249 if (bomptr != utf8_bom)
250 break;
251
252 bomptr = NULL;
253 }
254 }
255 if (c == '\n') {
256 if (config_file_eof)
257 return 0;
258 comment = 0;
259 continue;
260 }
261 if (comment || isspace(c))
262 continue;
263 if (c == '#' || c == ';') {
264 comment = 1;
265 continue;
266 }
267 if (c == '[') {
268 baselen = get_base_var(var);
269 if (baselen <= 0)
270 break;
271 var[baselen++] = '.';
272 var[baselen] = 0;
273 continue;
274 }
275 if (!isalpha(c))
276 break;
277 var[baselen] = tolower(c);
278
279
280
281
282
283 line = config_linenr;
284 if (get_value(fn, data, var, baselen+1) < 0) {
285 config_linenr = line;
286 break;
287 }
288 }
289 pr_err("bad config file line %d in %s\n", config_linenr, config_file_name);
290 return -1;
291}
292
293static int parse_unit_factor(const char *end, unsigned long *val)
294{
295 if (!*end)
296 return 1;
297 else if (!strcasecmp(end, "k")) {
298 *val *= 1024;
299 return 1;
300 }
301 else if (!strcasecmp(end, "m")) {
302 *val *= 1024 * 1024;
303 return 1;
304 }
305 else if (!strcasecmp(end, "g")) {
306 *val *= 1024 * 1024 * 1024;
307 return 1;
308 }
309 return 0;
310}
311
312static int perf_parse_llong(const char *value, long long *ret)
313{
314 if (value && *value) {
315 char *end;
316 long long val = strtoll(value, &end, 0);
317 unsigned long factor = 1;
318
319 if (!parse_unit_factor(end, &factor))
320 return 0;
321 *ret = val * factor;
322 return 1;
323 }
324 return 0;
325}
326
327static int perf_parse_long(const char *value, long *ret)
328{
329 if (value && *value) {
330 char *end;
331 long val = strtol(value, &end, 0);
332 unsigned long factor = 1;
333 if (!parse_unit_factor(end, &factor))
334 return 0;
335 *ret = val * factor;
336 return 1;
337 }
338 return 0;
339}
340
341static void bad_config(const char *name)
342{
343 if (config_file_name)
344 pr_warning("bad config value for '%s' in %s, ignoring...\n", name, config_file_name);
345 else
346 pr_warning("bad config value for '%s', ignoring...\n", name);
347}
348
349int perf_config_u64(u64 *dest, const char *name, const char *value)
350{
351 long long ret = 0;
352
353 if (!perf_parse_llong(value, &ret)) {
354 bad_config(name);
355 return -1;
356 }
357
358 *dest = ret;
359 return 0;
360}
361
362int perf_config_int(int *dest, const char *name, const char *value)
363{
364 long ret = 0;
365 if (!perf_parse_long(value, &ret)) {
366 bad_config(name);
367 return -1;
368 }
369 *dest = ret;
370 return 0;
371}
372
373static int perf_config_bool_or_int(const char *name, const char *value, int *is_bool)
374{
375 int ret;
376
377 *is_bool = 1;
378 if (!value)
379 return 1;
380 if (!*value)
381 return 0;
382 if (!strcasecmp(value, "true") || !strcasecmp(value, "yes") || !strcasecmp(value, "on"))
383 return 1;
384 if (!strcasecmp(value, "false") || !strcasecmp(value, "no") || !strcasecmp(value, "off"))
385 return 0;
386 *is_bool = 0;
387 return perf_config_int(&ret, name, value) < 0 ? -1 : ret;
388}
389
390int perf_config_bool(const char *name, const char *value)
391{
392 int discard;
393 return !!perf_config_bool_or_int(name, value, &discard);
394}
395
396static const char *perf_config_dirname(const char *name, const char *value)
397{
398 if (!name)
399 return NULL;
400 return value;
401}
402
403static int perf_buildid_config(const char *var, const char *value)
404{
405
406 if (!strcmp(var, "buildid.dir")) {
407 const char *dir = perf_config_dirname(var, value);
408
409 if (!dir) {
410 pr_err("Invalid buildid directory!\n");
411 return -1;
412 }
413 strncpy(buildid_dir, dir, MAXPATHLEN-1);
414 buildid_dir[MAXPATHLEN-1] = '\0';
415 }
416
417 return 0;
418}
419
420static int perf_default_core_config(const char *var __maybe_unused,
421 const char *value __maybe_unused)
422{
423 if (!strcmp(var, "core.proc-map-timeout"))
424 proc_map_timeout = strtoul(value, NULL, 10);
425
426
427 return 0;
428}
429
430static int perf_ui_config(const char *var, const char *value)
431{
432
433 if (!strcmp(var, "ui.show-headers"))
434 symbol_conf.show_hist_headers = perf_config_bool(var, value);
435
436 return 0;
437}
438
439int perf_default_config(const char *var, const char *value,
440 void *dummy __maybe_unused)
441{
442 if (strstarts(var, "core."))
443 return perf_default_core_config(var, value);
444
445 if (strstarts(var, "hist."))
446 return perf_hist_config(var, value);
447
448 if (strstarts(var, "ui."))
449 return perf_ui_config(var, value);
450
451 if (strstarts(var, "call-graph."))
452 return perf_callchain_config(var, value);
453
454 if (strstarts(var, "llvm."))
455 return perf_llvm_config(var, value);
456
457 if (strstarts(var, "buildid."))
458 return perf_buildid_config(var, value);
459
460
461 return 0;
462}
463
464static int perf_config_from_file(config_fn_t fn, const char *filename, void *data)
465{
466 int ret;
467 FILE *f = fopen(filename, "r");
468
469 ret = -1;
470 if (f) {
471 config_file = f;
472 config_file_name = filename;
473 config_linenr = 1;
474 config_file_eof = 0;
475 ret = perf_parse_file(fn, data);
476 fclose(f);
477 config_file_name = NULL;
478 }
479 return ret;
480}
481
482const char *perf_etc_perfconfig(void)
483{
484 static const char *system_wide;
485 if (!system_wide)
486 system_wide = system_path(ETC_PERFCONFIG);
487 return system_wide;
488}
489
490static int perf_env_bool(const char *k, int def)
491{
492 const char *v = getenv(k);
493 return v ? perf_config_bool(k, v) : def;
494}
495
496static int perf_config_system(void)
497{
498 return !perf_env_bool("PERF_CONFIG_NOSYSTEM", 0);
499}
500
501static int perf_config_global(void)
502{
503 return !perf_env_bool("PERF_CONFIG_NOGLOBAL", 0);
504}
505
506static struct perf_config_section *find_section(struct list_head *sections,
507 const char *section_name)
508{
509 struct perf_config_section *section;
510
511 list_for_each_entry(section, sections, node)
512 if (!strcmp(section->name, section_name))
513 return section;
514
515 return NULL;
516}
517
518static struct perf_config_item *find_config_item(const char *name,
519 struct perf_config_section *section)
520{
521 struct perf_config_item *item;
522
523 list_for_each_entry(item, §ion->items, node)
524 if (!strcmp(item->name, name))
525 return item;
526
527 return NULL;
528}
529
530static struct perf_config_section *add_section(struct list_head *sections,
531 const char *section_name)
532{
533 struct perf_config_section *section = zalloc(sizeof(*section));
534
535 if (!section)
536 return NULL;
537
538 INIT_LIST_HEAD(§ion->items);
539 section->name = strdup(section_name);
540 if (!section->name) {
541 pr_debug("%s: strdup failed\n", __func__);
542 free(section);
543 return NULL;
544 }
545
546 list_add_tail(§ion->node, sections);
547 return section;
548}
549
550static struct perf_config_item *add_config_item(struct perf_config_section *section,
551 const char *name)
552{
553 struct perf_config_item *item = zalloc(sizeof(*item));
554
555 if (!item)
556 return NULL;
557
558 item->name = strdup(name);
559 if (!item->name) {
560 pr_debug("%s: strdup failed\n", __func__);
561 free(item);
562 return NULL;
563 }
564
565 list_add_tail(&item->node, §ion->items);
566 return item;
567}
568
569static int set_value(struct perf_config_item *item, const char *value)
570{
571 char *val = strdup(value);
572
573 if (!val)
574 return -1;
575
576 zfree(&item->value);
577 item->value = val;
578 return 0;
579}
580
581static int collect_config(const char *var, const char *value,
582 void *perf_config_set)
583{
584 int ret = -1;
585 char *ptr, *key;
586 char *section_name, *name;
587 struct perf_config_section *section = NULL;
588 struct perf_config_item *item = NULL;
589 struct perf_config_set *set = perf_config_set;
590 struct list_head *sections;
591
592 if (set == NULL)
593 return -1;
594
595 sections = &set->sections;
596 key = ptr = strdup(var);
597 if (!key) {
598 pr_debug("%s: strdup failed\n", __func__);
599 return -1;
600 }
601
602 section_name = strsep(&ptr, ".");
603 name = ptr;
604 if (name == NULL || value == NULL)
605 goto out_free;
606
607 section = find_section(sections, section_name);
608 if (!section) {
609 section = add_section(sections, section_name);
610 if (!section)
611 goto out_free;
612 }
613
614 item = find_config_item(name, section);
615 if (!item) {
616 item = add_config_item(section, name);
617 if (!item)
618 goto out_free;
619 }
620
621
622
623
624
625
626 if (strcmp(config_file_name, perf_etc_perfconfig()) == 0) {
627 section->from_system_config = true;
628 item->from_system_config = true;
629 } else {
630 section->from_system_config = false;
631 item->from_system_config = false;
632 }
633
634 ret = set_value(item, value);
635
636out_free:
637 free(key);
638 return ret;
639}
640
641int perf_config_set__collect(struct perf_config_set *set, const char *file_name,
642 const char *var, const char *value)
643{
644 config_file_name = file_name;
645 return collect_config(var, value, set);
646}
647
648static int perf_config_set__init(struct perf_config_set *set)
649{
650 int ret = -1;
651 const char *home = NULL;
652 char *user_config;
653 struct stat st;
654
655
656 if (config_exclusive_filename)
657 return perf_config_from_file(collect_config, config_exclusive_filename, set);
658 if (perf_config_system() && !access(perf_etc_perfconfig(), R_OK)) {
659 if (perf_config_from_file(collect_config, perf_etc_perfconfig(), set) < 0)
660 goto out;
661 }
662
663 home = getenv("HOME");
664
665
666
667
668
669
670 if (!home || !*home || !perf_config_global())
671 return 0;
672
673 user_config = strdup(mkpath("%s/.perfconfig", home));
674 if (user_config == NULL) {
675 pr_warning("Not enough memory to process %s/.perfconfig, ignoring it.", home);
676 goto out;
677 }
678
679 if (stat(user_config, &st) < 0) {
680 if (errno == ENOENT)
681 ret = 0;
682 goto out_free;
683 }
684
685 ret = 0;
686
687 if (st.st_uid && (st.st_uid != geteuid())) {
688 pr_warning("File %s not owned by current user or root, ignoring it.", user_config);
689 goto out_free;
690 }
691
692 if (st.st_size)
693 ret = perf_config_from_file(collect_config, user_config, set);
694
695out_free:
696 free(user_config);
697out:
698 return ret;
699}
700
701struct perf_config_set *perf_config_set__new(void)
702{
703 struct perf_config_set *set = zalloc(sizeof(*set));
704
705 if (set) {
706 INIT_LIST_HEAD(&set->sections);
707 perf_config_set__init(set);
708 }
709
710 return set;
711}
712
713static int perf_config__init(void)
714{
715 if (config_set == NULL)
716 config_set = perf_config_set__new();
717
718 return config_set == NULL;
719}
720
721int perf_config(config_fn_t fn, void *data)
722{
723 int ret = 0;
724 char key[BUFSIZ];
725 struct perf_config_section *section;
726 struct perf_config_item *item;
727
728 if (config_set == NULL && perf_config__init())
729 return -1;
730
731 perf_config_set__for_each_entry(config_set, section, item) {
732 char *value = item->value;
733
734 if (value) {
735 scnprintf(key, sizeof(key), "%s.%s",
736 section->name, item->name);
737 ret = fn(key, value, data);
738 if (ret < 0) {
739 pr_err("Error: wrong config key-value pair %s=%s\n",
740 key, value);
741
742
743
744
745 goto out;
746 }
747 }
748 }
749out:
750 return ret;
751}
752
753void perf_config__exit(void)
754{
755 perf_config_set__delete(config_set);
756 config_set = NULL;
757}
758
759void perf_config__refresh(void)
760{
761 perf_config__exit();
762 perf_config__init();
763}
764
765static void perf_config_item__delete(struct perf_config_item *item)
766{
767 zfree(&item->name);
768 zfree(&item->value);
769 free(item);
770}
771
772static void perf_config_section__purge(struct perf_config_section *section)
773{
774 struct perf_config_item *item, *tmp;
775
776 list_for_each_entry_safe(item, tmp, §ion->items, node) {
777 list_del_init(&item->node);
778 perf_config_item__delete(item);
779 }
780}
781
782static void perf_config_section__delete(struct perf_config_section *section)
783{
784 perf_config_section__purge(section);
785 zfree(§ion->name);
786 free(section);
787}
788
789static void perf_config_set__purge(struct perf_config_set *set)
790{
791 struct perf_config_section *section, *tmp;
792
793 list_for_each_entry_safe(section, tmp, &set->sections, node) {
794 list_del_init(§ion->node);
795 perf_config_section__delete(section);
796 }
797}
798
799void perf_config_set__delete(struct perf_config_set *set)
800{
801 if (set == NULL)
802 return;
803
804 perf_config_set__purge(set);
805 free(set);
806}
807
808
809
810
811
812int config_error_nonbool(const char *var)
813{
814 pr_err("Missing value for '%s'", var);
815 return -1;
816}
817
818void set_buildid_dir(const char *dir)
819{
820 if (dir)
821 scnprintf(buildid_dir, MAXPATHLEN, "%s", dir);
822
823
824 if (buildid_dir[0] == '\0') {
825 char *home = getenv("HOME");
826
827 if (home) {
828 snprintf(buildid_dir, MAXPATHLEN, "%s/%s",
829 home, DEBUG_CACHE_DIR);
830 } else {
831 strncpy(buildid_dir, DEBUG_CACHE_DIR, MAXPATHLEN-1);
832 }
833 buildid_dir[MAXPATHLEN-1] = '\0';
834 }
835
836 setenv("PERF_BUILDID_DIR", buildid_dir, 1);
837}
838
