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13
14#define pr_fmt(fmt) "dyndbg: " fmt
15
16#include <linux/kernel.h>
17#include <linux/module.h>
18#include <linux/moduleparam.h>
19#include <linux/kallsyms.h>
20#include <linux/types.h>
21#include <linux/mutex.h>
22#include <linux/proc_fs.h>
23#include <linux/seq_file.h>
24#include <linux/list.h>
25#include <linux/sysctl.h>
26#include <linux/ctype.h>
27#include <linux/string.h>
28#include <linux/parser.h>
29#include <linux/string_helpers.h>
30#include <linux/uaccess.h>
31#include <linux/dynamic_debug.h>
32#include <linux/debugfs.h>
33#include <linux/slab.h>
34#include <linux/jump_label.h>
35#include <linux/hardirq.h>
36#include <linux/sched.h>
37#include <linux/device.h>
38#include <linux/netdevice.h>
39
40#include <rdma/ib_verbs.h>
41
42extern struct _ddebug __start___dyndbg[];
43extern struct _ddebug __stop___dyndbg[];
44
45struct ddebug_table {
46 struct list_head link;
47 const char *mod_name;
48 unsigned int num_ddebugs;
49 struct _ddebug *ddebugs;
50};
51
52struct ddebug_query {
53 const char *filename;
54 const char *module;
55 const char *function;
56 const char *format;
57 unsigned int first_lineno, last_lineno;
58};
59
60struct ddebug_iter {
61 struct ddebug_table *table;
62 unsigned int idx;
63};
64
65struct flag_settings {
66 unsigned int flags;
67 unsigned int mask;
68};
69
70static DEFINE_MUTEX(ddebug_lock);
71static LIST_HEAD(ddebug_tables);
72static int verbose;
73module_param(verbose, int, 0644);
74
75
76static inline const char *trim_prefix(const char *path)
77{
78 int skip = strlen(__FILE__) - strlen("lib/dynamic_debug.c");
79
80 if (strncmp(path, __FILE__, skip))
81 skip = 0;
82
83 return path + skip;
84}
85
86static struct { unsigned flag:8; char opt_char; } opt_array[] = {
87 { _DPRINTK_FLAGS_PRINT, 'p' },
88 { _DPRINTK_FLAGS_INCL_MODNAME, 'm' },
89 { _DPRINTK_FLAGS_INCL_FUNCNAME, 'f' },
90 { _DPRINTK_FLAGS_INCL_LINENO, 'l' },
91 { _DPRINTK_FLAGS_INCL_TID, 't' },
92 { _DPRINTK_FLAGS_NONE, '_' },
93};
94
95struct flagsbuf { char buf[ARRAY_SIZE(opt_array)+1]; };
96
97
98static char *ddebug_describe_flags(unsigned int flags, struct flagsbuf *fb)
99{
100 char *p = fb->buf;
101 int i;
102
103 for (i = 0; i < ARRAY_SIZE(opt_array); ++i)
104 if (flags & opt_array[i].flag)
105 *p++ = opt_array[i].opt_char;
106 if (p == fb->buf)
107 *p++ = '_';
108 *p = '\0';
109
110 return fb->buf;
111}
112
113#define vnpr_info(lvl, fmt, ...) \
114do { \
115 if (verbose >= lvl) \
116 pr_info(fmt, ##__VA_ARGS__); \
117} while (0)
118
119#define vpr_info(fmt, ...) vnpr_info(1, fmt, ##__VA_ARGS__)
120#define v2pr_info(fmt, ...) vnpr_info(2, fmt, ##__VA_ARGS__)
121
122static void vpr_info_dq(const struct ddebug_query *query, const char *msg)
123{
124
125 int fmtlen = 0;
126
127 if (query->format) {
128 fmtlen = strlen(query->format);
129 while (fmtlen && query->format[fmtlen - 1] == '\n')
130 fmtlen--;
131 }
132
133 vpr_info("%s: func=\"%s\" file=\"%s\" module=\"%s\" format=\"%.*s\" lineno=%u-%u\n",
134 msg,
135 query->function ?: "",
136 query->filename ?: "",
137 query->module ?: "",
138 fmtlen, query->format ?: "",
139 query->first_lineno, query->last_lineno);
140}
141
142
143
144
145
146
147
148static int ddebug_change(const struct ddebug_query *query,
149 struct flag_settings *modifiers)
150{
151 int i;
152 struct ddebug_table *dt;
153 unsigned int newflags;
154 unsigned int nfound = 0;
155 struct flagsbuf fbuf;
156
157
158 mutex_lock(&ddebug_lock);
159 list_for_each_entry(dt, &ddebug_tables, link) {
160
161
162 if (query->module &&
163 !match_wildcard(query->module, dt->mod_name))
164 continue;
165
166 for (i = 0; i < dt->num_ddebugs; i++) {
167 struct _ddebug *dp = &dt->ddebugs[i];
168
169
170 if (query->filename &&
171 !match_wildcard(query->filename, dp->filename) &&
172 !match_wildcard(query->filename,
173 kbasename(dp->filename)) &&
174 !match_wildcard(query->filename,
175 trim_prefix(dp->filename)))
176 continue;
177
178
179 if (query->function &&
180 !match_wildcard(query->function, dp->function))
181 continue;
182
183
184 if (query->format) {
185 if (*query->format == '^') {
186 char *p;
187
188 p = strstr(dp->format, query->format+1);
189 if (p != dp->format)
190 continue;
191 } else if (!strstr(dp->format, query->format))
192 continue;
193 }
194
195
196 if (query->first_lineno &&
197 dp->lineno < query->first_lineno)
198 continue;
199 if (query->last_lineno &&
200 dp->lineno > query->last_lineno)
201 continue;
202
203 nfound++;
204
205 newflags = (dp->flags & modifiers->mask) | modifiers->flags;
206 if (newflags == dp->flags)
207 continue;
208#ifdef CONFIG_JUMP_LABEL
209 if (dp->flags & _DPRINTK_FLAGS_PRINT) {
210 if (!(modifiers->flags & _DPRINTK_FLAGS_PRINT))
211 static_branch_disable(&dp->key.dd_key_true);
212 } else if (modifiers->flags & _DPRINTK_FLAGS_PRINT)
213 static_branch_enable(&dp->key.dd_key_true);
214#endif
215 dp->flags = newflags;
216 v2pr_info("changed %s:%d [%s]%s =%s\n",
217 trim_prefix(dp->filename), dp->lineno,
218 dt->mod_name, dp->function,
219 ddebug_describe_flags(dp->flags, &fbuf));
220 }
221 }
222 mutex_unlock(&ddebug_lock);
223
224 if (!nfound && verbose)
225 pr_info("no matches for query\n");
226
227 return nfound;
228}
229
230
231
232
233
234
235
236static int ddebug_tokenize(char *buf, char *words[], int maxwords)
237{
238 int nwords = 0;
239
240 while (*buf) {
241 char *end;
242
243
244 buf = skip_spaces(buf);
245 if (!*buf)
246 break;
247 if (*buf == '#')
248 break;
249
250
251 if (*buf == '"' || *buf == '\'') {
252 int quote = *buf++;
253 for (end = buf; *end && *end != quote; end++)
254 ;
255 if (!*end) {
256 pr_err("unclosed quote: %s\n", buf);
257 return -EINVAL;
258 }
259 } else {
260 for (end = buf; *end && !isspace(*end); end++)
261 ;
262 BUG_ON(end == buf);
263 }
264
265
266 if (nwords == maxwords) {
267 pr_err("too many words, legal max <=%d\n", maxwords);
268 return -EINVAL;
269 }
270 if (*end)
271 *end++ = '\0';
272 words[nwords++] = buf;
273 buf = end;
274 }
275
276 if (verbose) {
277 int i;
278 pr_info("split into words:");
279 for (i = 0; i < nwords; i++)
280 pr_cont(" \"%s\"", words[i]);
281 pr_cont("\n");
282 }
283
284 return nwords;
285}
286
287
288
289
290
291
292static inline int parse_lineno(const char *str, unsigned int *val)
293{
294 BUG_ON(str == NULL);
295 if (*str == '\0') {
296 *val = 0;
297 return 0;
298 }
299 if (kstrtouint(str, 10, val) < 0) {
300 pr_err("bad line-number: %s\n", str);
301 return -EINVAL;
302 }
303 return 0;
304}
305
306static int parse_linerange(struct ddebug_query *query, const char *first)
307{
308 char *last = strchr(first, '-');
309
310 if (query->first_lineno || query->last_lineno) {
311 pr_err("match-spec: line used 2x\n");
312 return -EINVAL;
313 }
314 if (last)
315 *last++ = '\0';
316 if (parse_lineno(first, &query->first_lineno) < 0)
317 return -EINVAL;
318 if (last) {
319
320 if (parse_lineno(last, &query->last_lineno) < 0)
321 return -EINVAL;
322
323
324 if (query->last_lineno == 0)
325 query->last_lineno = UINT_MAX;
326
327 if (query->last_lineno < query->first_lineno) {
328 pr_err("last-line:%d < 1st-line:%d\n",
329 query->last_lineno,
330 query->first_lineno);
331 return -EINVAL;
332 }
333 } else {
334 query->last_lineno = query->first_lineno;
335 }
336 vpr_info("parsed line %d-%d\n", query->first_lineno,
337 query->last_lineno);
338 return 0;
339}
340
341static int check_set(const char **dest, char *src, char *name)
342{
343 int rc = 0;
344
345 if (*dest) {
346 rc = -EINVAL;
347 pr_err("match-spec:%s val:%s overridden by %s\n",
348 name, *dest, src);
349 }
350 *dest = src;
351 return rc;
352}
353
354
355
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358
359
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361
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364
365
366
367
368
369static int ddebug_parse_query(char *words[], int nwords,
370 struct ddebug_query *query, const char *modname)
371{
372 unsigned int i;
373 int rc = 0;
374 char *fline;
375
376
377 if (nwords % 2 != 0) {
378 pr_err("expecting pairs of match-spec <value>\n");
379 return -EINVAL;
380 }
381
382 if (modname)
383
384 query->module = modname;
385
386 for (i = 0; i < nwords; i += 2) {
387 char *keyword = words[i];
388 char *arg = words[i+1];
389
390 if (!strcmp(keyword, "func")) {
391 rc = check_set(&query->function, arg, "func");
392 } else if (!strcmp(keyword, "file")) {
393 if (check_set(&query->filename, arg, "file"))
394 return -EINVAL;
395
396
397 fline = strchr(query->filename, ':');
398 if (!fline)
399 continue;
400 *fline++ = '\0';
401 if (isalpha(*fline) || *fline == '*' || *fline == '?') {
402
403 if (check_set(&query->function, fline, "func"))
404 return -EINVAL;
405 } else {
406 if (parse_linerange(query, fline))
407 return -EINVAL;
408 }
409 } else if (!strcmp(keyword, "module")) {
410 rc = check_set(&query->module, arg, "module");
411 } else if (!strcmp(keyword, "format")) {
412 string_unescape_inplace(arg, UNESCAPE_SPACE |
413 UNESCAPE_OCTAL |
414 UNESCAPE_SPECIAL);
415 rc = check_set(&query->format, arg, "format");
416 } else if (!strcmp(keyword, "line")) {
417 if (parse_linerange(query, arg))
418 return -EINVAL;
419 } else {
420 pr_err("unknown keyword \"%s\"\n", keyword);
421 return -EINVAL;
422 }
423 if (rc)
424 return rc;
425 }
426 vpr_info_dq(query, "parsed");
427 return 0;
428}
429
430
431
432
433
434
435
436static int ddebug_parse_flags(const char *str, struct flag_settings *modifiers)
437{
438 int op, i;
439
440 switch (*str) {
441 case '+':
442 case '-':
443 case '=':
444 op = *str++;
445 break;
446 default:
447 pr_err("bad flag-op %c, at start of %s\n", *str, str);
448 return -EINVAL;
449 }
450 vpr_info("op='%c'\n", op);
451
452 for (; *str ; ++str) {
453 for (i = ARRAY_SIZE(opt_array) - 1; i >= 0; i--) {
454 if (*str == opt_array[i].opt_char) {
455 modifiers->flags |= opt_array[i].flag;
456 break;
457 }
458 }
459 if (i < 0) {
460 pr_err("unknown flag '%c'\n", *str);
461 return -EINVAL;
462 }
463 }
464 vpr_info("flags=0x%x\n", modifiers->flags);
465
466
467 switch (op) {
468 case '=':
469
470 modifiers->mask = 0;
471 break;
472 case '+':
473 modifiers->mask = ~0U;
474 break;
475 case '-':
476 modifiers->mask = ~modifiers->flags;
477 modifiers->flags = 0;
478 break;
479 }
480 vpr_info("*flagsp=0x%x *maskp=0x%x\n", modifiers->flags, modifiers->mask);
481
482 return 0;
483}
484
485static int ddebug_exec_query(char *query_string, const char *modname)
486{
487 struct flag_settings modifiers = {};
488 struct ddebug_query query = {};
489#define MAXWORDS 9
490 int nwords, nfound;
491 char *words[MAXWORDS];
492
493 nwords = ddebug_tokenize(query_string, words, MAXWORDS);
494 if (nwords <= 0) {
495 pr_err("tokenize failed\n");
496 return -EINVAL;
497 }
498
499 if (ddebug_parse_flags(words[nwords-1], &modifiers)) {
500 pr_err("flags parse failed\n");
501 return -EINVAL;
502 }
503 if (ddebug_parse_query(words, nwords-1, &query, modname)) {
504 pr_err("query parse failed\n");
505 return -EINVAL;
506 }
507
508 nfound = ddebug_change(&query, &modifiers);
509 vpr_info_dq(&query, nfound ? "applied" : "no-match");
510
511 return nfound;
512}
513
514
515
516
517
518static int ddebug_exec_queries(char *query, const char *modname)
519{
520 char *split;
521 int i, errs = 0, exitcode = 0, rc, nfound = 0;
522
523 for (i = 0; query; query = split) {
524 split = strpbrk(query, ";\n");
525 if (split)
526 *split++ = '\0';
527
528 query = skip_spaces(query);
529 if (!query || !*query || *query == '#')
530 continue;
531
532 vpr_info("query %d: \"%s\"\n", i, query);
533
534 rc = ddebug_exec_query(query, modname);
535 if (rc < 0) {
536 errs++;
537 exitcode = rc;
538 } else {
539 nfound += rc;
540 }
541 i++;
542 }
543 vpr_info("processed %d queries, with %d matches, %d errs\n",
544 i, nfound, errs);
545
546 if (exitcode)
547 return exitcode;
548 return nfound;
549}
550
551
552
553
554
555
556
557
558
559
560
561int dynamic_debug_exec_queries(const char *query, const char *modname)
562{
563 int rc;
564 char *qry;
565
566 if (!query) {
567 pr_err("non-null query/command string expected\n");
568 return -EINVAL;
569 }
570 qry = kstrndup(query, PAGE_SIZE, GFP_KERNEL);
571 if (!qry)
572 return -ENOMEM;
573
574 rc = ddebug_exec_queries(qry, modname);
575 kfree(qry);
576 return rc;
577}
578EXPORT_SYMBOL_GPL(dynamic_debug_exec_queries);
579
580#define PREFIX_SIZE 64
581
582static int remaining(int wrote)
583{
584 if (PREFIX_SIZE - wrote > 0)
585 return PREFIX_SIZE - wrote;
586 return 0;
587}
588
589static char *__dynamic_emit_prefix(const struct _ddebug *desc, char *buf)
590{
591 int pos_after_tid;
592 int pos = 0;
593
594 if (desc->flags & _DPRINTK_FLAGS_INCL_TID) {
595 if (in_interrupt())
596 pos += snprintf(buf + pos, remaining(pos), "<intr> ");
597 else
598 pos += snprintf(buf + pos, remaining(pos), "[%d] ",
599 task_pid_vnr(current));
600 }
601 pos_after_tid = pos;
602 if (desc->flags & _DPRINTK_FLAGS_INCL_MODNAME)
603 pos += snprintf(buf + pos, remaining(pos), "%s:",
604 desc->modname);
605 if (desc->flags & _DPRINTK_FLAGS_INCL_FUNCNAME)
606 pos += snprintf(buf + pos, remaining(pos), "%s:",
607 desc->function);
608 if (desc->flags & _DPRINTK_FLAGS_INCL_LINENO)
609 pos += snprintf(buf + pos, remaining(pos), "%d:",
610 desc->lineno);
611 if (pos - pos_after_tid)
612 pos += snprintf(buf + pos, remaining(pos), " ");
613 if (pos >= PREFIX_SIZE)
614 buf[PREFIX_SIZE - 1] = '\0';
615
616 return buf;
617}
618
619static inline char *dynamic_emit_prefix(struct _ddebug *desc, char *buf)
620{
621 if (unlikely(desc->flags & _DPRINTK_FLAGS_INCL_ANY))
622 return __dynamic_emit_prefix(desc, buf);
623 return buf;
624}
625
626void __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...)
627{
628 va_list args;
629 struct va_format vaf;
630 char buf[PREFIX_SIZE] = "";
631
632 BUG_ON(!descriptor);
633 BUG_ON(!fmt);
634
635 va_start(args, fmt);
636
637 vaf.fmt = fmt;
638 vaf.va = &args;
639
640 printk(KERN_DEBUG "%s%pV", dynamic_emit_prefix(descriptor, buf), &vaf);
641
642 va_end(args);
643}
644EXPORT_SYMBOL(__dynamic_pr_debug);
645
646void __dynamic_dev_dbg(struct _ddebug *descriptor,
647 const struct device *dev, const char *fmt, ...)
648{
649 struct va_format vaf;
650 va_list args;
651
652 BUG_ON(!descriptor);
653 BUG_ON(!fmt);
654
655 va_start(args, fmt);
656
657 vaf.fmt = fmt;
658 vaf.va = &args;
659
660 if (!dev) {
661 printk(KERN_DEBUG "(NULL device *): %pV", &vaf);
662 } else {
663 char buf[PREFIX_SIZE] = "";
664
665 dev_printk_emit(LOGLEVEL_DEBUG, dev, "%s%s %s: %pV",
666 dynamic_emit_prefix(descriptor, buf),
667 dev_driver_string(dev), dev_name(dev),
668 &vaf);
669 }
670
671 va_end(args);
672}
673EXPORT_SYMBOL(__dynamic_dev_dbg);
674
675#ifdef CONFIG_NET
676
677void __dynamic_netdev_dbg(struct _ddebug *descriptor,
678 const struct net_device *dev, const char *fmt, ...)
679{
680 struct va_format vaf;
681 va_list args;
682
683 BUG_ON(!descriptor);
684 BUG_ON(!fmt);
685
686 va_start(args, fmt);
687
688 vaf.fmt = fmt;
689 vaf.va = &args;
690
691 if (dev && dev->dev.parent) {
692 char buf[PREFIX_SIZE] = "";
693
694 dev_printk_emit(LOGLEVEL_DEBUG, dev->dev.parent,
695 "%s%s %s %s%s: %pV",
696 dynamic_emit_prefix(descriptor, buf),
697 dev_driver_string(dev->dev.parent),
698 dev_name(dev->dev.parent),
699 netdev_name(dev), netdev_reg_state(dev),
700 &vaf);
701 } else if (dev) {
702 printk(KERN_DEBUG "%s%s: %pV", netdev_name(dev),
703 netdev_reg_state(dev), &vaf);
704 } else {
705 printk(KERN_DEBUG "(NULL net_device): %pV", &vaf);
706 }
707
708 va_end(args);
709}
710EXPORT_SYMBOL(__dynamic_netdev_dbg);
711
712#endif
713
714#if IS_ENABLED(CONFIG_INFINIBAND)
715
716void __dynamic_ibdev_dbg(struct _ddebug *descriptor,
717 const struct ib_device *ibdev, const char *fmt, ...)
718{
719 struct va_format vaf;
720 va_list args;
721
722 va_start(args, fmt);
723
724 vaf.fmt = fmt;
725 vaf.va = &args;
726
727 if (ibdev && ibdev->dev.parent) {
728 char buf[PREFIX_SIZE] = "";
729
730 dev_printk_emit(LOGLEVEL_DEBUG, ibdev->dev.parent,
731 "%s%s %s %s: %pV",
732 dynamic_emit_prefix(descriptor, buf),
733 dev_driver_string(ibdev->dev.parent),
734 dev_name(ibdev->dev.parent),
735 dev_name(&ibdev->dev),
736 &vaf);
737 } else if (ibdev) {
738 printk(KERN_DEBUG "%s: %pV", dev_name(&ibdev->dev), &vaf);
739 } else {
740 printk(KERN_DEBUG "(NULL ib_device): %pV", &vaf);
741 }
742
743 va_end(args);
744}
745EXPORT_SYMBOL(__dynamic_ibdev_dbg);
746
747#endif
748
749#define DDEBUG_STRING_SIZE 1024
750static __initdata char ddebug_setup_string[DDEBUG_STRING_SIZE];
751
752static __init int ddebug_setup_query(char *str)
753{
754 if (strlen(str) >= DDEBUG_STRING_SIZE) {
755 pr_warn("ddebug boot param string too large\n");
756 return 0;
757 }
758 strlcpy(ddebug_setup_string, str, DDEBUG_STRING_SIZE);
759 return 1;
760}
761
762__setup("ddebug_query=", ddebug_setup_query);
763
764
765
766
767
768#define USER_BUF_PAGE 4096
769static ssize_t ddebug_proc_write(struct file *file, const char __user *ubuf,
770 size_t len, loff_t *offp)
771{
772 char *tmpbuf;
773 int ret;
774
775 if (len == 0)
776 return 0;
777 if (len > USER_BUF_PAGE - 1) {
778 pr_warn("expected <%d bytes into control\n", USER_BUF_PAGE);
779 return -E2BIG;
780 }
781 tmpbuf = memdup_user_nul(ubuf, len);
782 if (IS_ERR(tmpbuf))
783 return PTR_ERR(tmpbuf);
784 vpr_info("read %d bytes from userspace\n", (int)len);
785
786 ret = ddebug_exec_queries(tmpbuf, NULL);
787 kfree(tmpbuf);
788 if (ret < 0)
789 return ret;
790
791 *offp += len;
792 return len;
793}
794
795
796
797
798
799
800static struct _ddebug *ddebug_iter_first(struct ddebug_iter *iter)
801{
802 if (list_empty(&ddebug_tables)) {
803 iter->table = NULL;
804 iter->idx = 0;
805 return NULL;
806 }
807 iter->table = list_entry(ddebug_tables.next,
808 struct ddebug_table, link);
809 iter->idx = 0;
810 return &iter->table->ddebugs[iter->idx];
811}
812
813
814
815
816
817
818
819static struct _ddebug *ddebug_iter_next(struct ddebug_iter *iter)
820{
821 if (iter->table == NULL)
822 return NULL;
823 if (++iter->idx == iter->table->num_ddebugs) {
824
825 iter->idx = 0;
826 if (list_is_last(&iter->table->link, &ddebug_tables)) {
827 iter->table = NULL;
828 return NULL;
829 }
830 iter->table = list_entry(iter->table->link.next,
831 struct ddebug_table, link);
832 }
833 return &iter->table->ddebugs[iter->idx];
834}
835
836
837
838
839
840
841static void *ddebug_proc_start(struct seq_file *m, loff_t *pos)
842{
843 struct ddebug_iter *iter = m->private;
844 struct _ddebug *dp;
845 int n = *pos;
846
847 mutex_lock(&ddebug_lock);
848
849 if (!n)
850 return SEQ_START_TOKEN;
851 if (n < 0)
852 return NULL;
853 dp = ddebug_iter_first(iter);
854 while (dp != NULL && --n > 0)
855 dp = ddebug_iter_next(iter);
856 return dp;
857}
858
859
860
861
862
863
864static void *ddebug_proc_next(struct seq_file *m, void *p, loff_t *pos)
865{
866 struct ddebug_iter *iter = m->private;
867 struct _ddebug *dp;
868
869 if (p == SEQ_START_TOKEN)
870 dp = ddebug_iter_first(iter);
871 else
872 dp = ddebug_iter_next(iter);
873 ++*pos;
874 return dp;
875}
876
877
878
879
880
881
882
883static int ddebug_proc_show(struct seq_file *m, void *p)
884{
885 struct ddebug_iter *iter = m->private;
886 struct _ddebug *dp = p;
887 struct flagsbuf flags;
888
889 if (p == SEQ_START_TOKEN) {
890 seq_puts(m,
891 "# filename:lineno [module]function flags format\n");
892 return 0;
893 }
894
895 seq_printf(m, "%s:%u [%s]%s =%s \"",
896 trim_prefix(dp->filename), dp->lineno,
897 iter->table->mod_name, dp->function,
898 ddebug_describe_flags(dp->flags, &flags));
899 seq_escape(m, dp->format, "\t\r\n\"");
900 seq_puts(m, "\"\n");
901
902 return 0;
903}
904
905
906
907
908
909static void ddebug_proc_stop(struct seq_file *m, void *p)
910{
911 mutex_unlock(&ddebug_lock);
912}
913
914static const struct seq_operations ddebug_proc_seqops = {
915 .start = ddebug_proc_start,
916 .next = ddebug_proc_next,
917 .show = ddebug_proc_show,
918 .stop = ddebug_proc_stop
919};
920
921static int ddebug_proc_open(struct inode *inode, struct file *file)
922{
923 return seq_open_private(file, &ddebug_proc_seqops,
924 sizeof(struct ddebug_iter));
925}
926
927static const struct file_operations ddebug_proc_fops = {
928 .owner = THIS_MODULE,
929 .open = ddebug_proc_open,
930 .read = seq_read,
931 .llseek = seq_lseek,
932 .release = seq_release_private,
933 .write = ddebug_proc_write
934};
935
936static const struct proc_ops proc_fops = {
937 .proc_open = ddebug_proc_open,
938 .proc_read = seq_read,
939 .proc_lseek = seq_lseek,
940 .proc_release = seq_release_private,
941 .proc_write = ddebug_proc_write
942};
943
944
945
946
947
948int ddebug_add_module(struct _ddebug *tab, unsigned int n,
949 const char *name)
950{
951 struct ddebug_table *dt;
952
953 dt = kzalloc(sizeof(*dt), GFP_KERNEL);
954 if (dt == NULL) {
955 pr_err("error adding module: %s\n", name);
956 return -ENOMEM;
957 }
958
959
960
961
962
963
964 dt->mod_name = name;
965 dt->num_ddebugs = n;
966 dt->ddebugs = tab;
967
968 mutex_lock(&ddebug_lock);
969 list_add(&dt->link, &ddebug_tables);
970 mutex_unlock(&ddebug_lock);
971
972 v2pr_info("%3u debug prints in module %s\n", n, dt->mod_name);
973 return 0;
974}
975
976
977static int ddebug_dyndbg_param_cb(char *param, char *val,
978 const char *modname, int on_err)
979{
980 char *sep;
981
982 sep = strchr(param, '.');
983 if (sep) {
984
985 *sep = '\0';
986 modname = param;
987 param = sep + 1;
988 }
989 if (strcmp(param, "dyndbg"))
990 return on_err;
991
992 ddebug_exec_queries((val ? val : "+p"), modname);
993
994 return 0;
995}
996
997
998static int ddebug_dyndbg_boot_param_cb(char *param, char *val,
999 const char *unused, void *arg)
1000{
1001 vpr_info("%s=\"%s\"\n", param, val);
1002 return ddebug_dyndbg_param_cb(param, val, NULL, 0);
1003}
1004
1005
1006
1007
1008
1009
1010int ddebug_dyndbg_module_param_cb(char *param, char *val, const char *module)
1011{
1012 vpr_info("module: %s %s=\"%s\"\n", module, param, val);
1013 return ddebug_dyndbg_param_cb(param, val, module, -ENOENT);
1014}
1015
1016static void ddebug_table_free(struct ddebug_table *dt)
1017{
1018 list_del_init(&dt->link);
1019 kfree(dt);
1020}
1021
1022
1023
1024
1025
1026int ddebug_remove_module(const char *mod_name)
1027{
1028 struct ddebug_table *dt, *nextdt;
1029 int ret = -ENOENT;
1030
1031 v2pr_info("removing module \"%s\"\n", mod_name);
1032
1033 mutex_lock(&ddebug_lock);
1034 list_for_each_entry_safe(dt, nextdt, &ddebug_tables, link) {
1035 if (dt->mod_name == mod_name) {
1036 ddebug_table_free(dt);
1037 ret = 0;
1038 break;
1039 }
1040 }
1041 mutex_unlock(&ddebug_lock);
1042 return ret;
1043}
1044
1045static void ddebug_remove_all_tables(void)
1046{
1047 mutex_lock(&ddebug_lock);
1048 while (!list_empty(&ddebug_tables)) {
1049 struct ddebug_table *dt = list_entry(ddebug_tables.next,
1050 struct ddebug_table,
1051 link);
1052 ddebug_table_free(dt);
1053 }
1054 mutex_unlock(&ddebug_lock);
1055}
1056
1057static __initdata int ddebug_init_success;
1058
1059static int __init dynamic_debug_init_control(void)
1060{
1061 struct proc_dir_entry *procfs_dir;
1062 struct dentry *debugfs_dir;
1063
1064 if (!ddebug_init_success)
1065 return -ENODEV;
1066
1067
1068 if (debugfs_initialized()) {
1069 debugfs_dir = debugfs_create_dir("dynamic_debug", NULL);
1070 debugfs_create_file("control", 0644, debugfs_dir, NULL,
1071 &ddebug_proc_fops);
1072 }
1073
1074
1075 procfs_dir = proc_mkdir("dynamic_debug", NULL);
1076 if (procfs_dir)
1077 proc_create("control", 0644, procfs_dir, &proc_fops);
1078
1079 return 0;
1080}
1081
1082static int __init dynamic_debug_init(void)
1083{
1084 struct _ddebug *iter, *iter_start;
1085 const char *modname = NULL;
1086 char *cmdline;
1087 int ret = 0;
1088 int n = 0, entries = 0, modct = 0;
1089
1090 if (&__start___dyndbg == &__stop___dyndbg) {
1091 if (IS_ENABLED(CONFIG_DYNAMIC_DEBUG)) {
1092 pr_warn("_ddebug table is empty in a CONFIG_DYNAMIC_DEBUG build\n");
1093 return 1;
1094 }
1095 pr_info("Ignore empty _ddebug table in a CONFIG_DYNAMIC_DEBUG_CORE build\n");
1096 ddebug_init_success = 1;
1097 return 0;
1098 }
1099 iter = __start___dyndbg;
1100 modname = iter->modname;
1101 iter_start = iter;
1102 for (; iter < __stop___dyndbg; iter++) {
1103 entries++;
1104 if (strcmp(modname, iter->modname)) {
1105 modct++;
1106 ret = ddebug_add_module(iter_start, n, modname);
1107 if (ret)
1108 goto out_err;
1109 n = 0;
1110 modname = iter->modname;
1111 iter_start = iter;
1112 }
1113 n++;
1114 }
1115 ret = ddebug_add_module(iter_start, n, modname);
1116 if (ret)
1117 goto out_err;
1118
1119 ddebug_init_success = 1;
1120 vpr_info("%d prdebugs in %d modules, %d KiB in ddebug tables, %d kiB in __dyndbg section\n",
1121 entries, modct, (int)((modct * sizeof(struct ddebug_table)) >> 10),
1122 (int)((entries * sizeof(struct _ddebug)) >> 10));
1123
1124
1125 if (ddebug_setup_string[0] != '\0') {
1126 pr_warn("ddebug_query param name is deprecated, change it to dyndbg\n");
1127 ret = ddebug_exec_queries(ddebug_setup_string, NULL);
1128 if (ret < 0)
1129 pr_warn("Invalid ddebug boot param %s\n",
1130 ddebug_setup_string);
1131 else
1132 pr_info("%d changes by ddebug_query\n", ret);
1133 }
1134
1135
1136
1137
1138
1139
1140
1141
1142 cmdline = kstrdup(saved_command_line, GFP_KERNEL);
1143 parse_args("dyndbg params", cmdline, NULL,
1144 0, 0, 0, NULL, &ddebug_dyndbg_boot_param_cb);
1145 kfree(cmdline);
1146 return 0;
1147
1148out_err:
1149 ddebug_remove_all_tables();
1150 return 0;
1151}
1152
1153early_initcall(dynamic_debug_init);
1154
1155
1156fs_initcall(dynamic_debug_init_control);
1157