4 * make pr_debug()/dev_dbg() calls runtime configurable based upon their
7 * Copyright (C) 2008 Jason Baron <jbaron@redhat.com>
8 * By Greg Banks <gnb@melbourne.sgi.com>
9 * Copyright (c) 2008 Silicon Graphics Inc. All Rights Reserved.
10 * Copyright (C) 2011 Bart Van Assche. All Rights Reserved.
11 * Copyright (C) 2013 Du, Changbin <changbin.du@gmail.com>
14 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
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>
40 extern struct _ddebug __start___verbose
[];
41 extern struct _ddebug __stop___verbose
[];
44 struct list_head link
;
46 unsigned int num_ddebugs
;
47 struct _ddebug
*ddebugs
;
55 unsigned int first_lineno
, last_lineno
;
59 struct ddebug_table
*table
;
63 static DEFINE_MUTEX(ddebug_lock
);
64 static LIST_HEAD(ddebug_tables
);
66 module_param(verbose
, int, 0644);
68 /* Return the path relative to source root */
69 static inline const char *trim_prefix(const char *path
)
71 int skip
= strlen(__FILE__
) - strlen("lib/dynamic_debug.c");
73 if (strncmp(path
, __FILE__
, skip
))
74 skip
= 0; /* prefix mismatch, don't skip */
79 static struct { unsigned flag
:8; char opt_char
; } opt_array
[] = {
80 { _DPRINTK_FLAGS_PRINT
, 'p' },
81 { _DPRINTK_FLAGS_INCL_MODNAME
, 'm' },
82 { _DPRINTK_FLAGS_INCL_FUNCNAME
, 'f' },
83 { _DPRINTK_FLAGS_INCL_LINENO
, 'l' },
84 { _DPRINTK_FLAGS_INCL_TID
, 't' },
85 { _DPRINTK_FLAGS_NONE
, '_' },
88 /* format a string into buf[] which describes the _ddebug's flags */
89 static char *ddebug_describe_flags(struct _ddebug
*dp
, char *buf
,
96 for (i
= 0; i
< ARRAY_SIZE(opt_array
); ++i
)
97 if (dp
->flags
& opt_array
[i
].flag
)
98 *p
++ = opt_array
[i
].opt_char
;
106 #define vpr_info(fmt, ...) \
109 pr_info(fmt, ##__VA_ARGS__); \
112 static void vpr_info_dq(const struct ddebug_query
*query
, const char *msg
)
114 /* trim any trailing newlines */
118 fmtlen
= strlen(query
->format
);
119 while (fmtlen
&& query
->format
[fmtlen
- 1] == '\n')
123 vpr_info("%s: func=\"%s\" file=\"%s\" module=\"%s\" format=\"%.*s\" lineno=%u-%u\n",
125 query
->function
? query
->function
: "",
126 query
->filename
? query
->filename
: "",
127 query
->module
? query
->module
: "",
128 fmtlen
, query
->format
? query
->format
: "",
129 query
->first_lineno
, query
->last_lineno
);
133 * Search the tables for _ddebug's which match the given `query' and
134 * apply the `flags' and `mask' to them. Returns number of matching
135 * callsites, normally the same as number of changes. If verbose,
136 * logs the changes. Takes ddebug_lock.
138 static int ddebug_change(const struct ddebug_query
*query
,
139 unsigned int flags
, unsigned int mask
)
142 struct ddebug_table
*dt
;
143 unsigned int newflags
;
144 unsigned int nfound
= 0;
147 /* search for matching ddebugs */
148 mutex_lock(&ddebug_lock
);
149 list_for_each_entry(dt
, &ddebug_tables
, link
) {
151 /* match against the module name */
153 !match_wildcard(query
->module
, dt
->mod_name
))
156 for (i
= 0; i
< dt
->num_ddebugs
; i
++) {
157 struct _ddebug
*dp
= &dt
->ddebugs
[i
];
159 /* match against the source filename */
160 if (query
->filename
&&
161 !match_wildcard(query
->filename
, dp
->filename
) &&
162 !match_wildcard(query
->filename
,
163 kbasename(dp
->filename
)) &&
164 !match_wildcard(query
->filename
,
165 trim_prefix(dp
->filename
)))
168 /* match against the function */
169 if (query
->function
&&
170 !match_wildcard(query
->function
, dp
->function
))
173 /* match against the format */
175 !strstr(dp
->format
, query
->format
))
178 /* match against the line number range */
179 if (query
->first_lineno
&&
180 dp
->lineno
< query
->first_lineno
)
182 if (query
->last_lineno
&&
183 dp
->lineno
> query
->last_lineno
)
188 newflags
= (dp
->flags
& mask
) | flags
;
189 if (newflags
== dp
->flags
)
191 dp
->flags
= newflags
;
192 vpr_info("changed %s:%d [%s]%s =%s\n",
193 trim_prefix(dp
->filename
), dp
->lineno
,
194 dt
->mod_name
, dp
->function
,
195 ddebug_describe_flags(dp
, flagbuf
,
199 mutex_unlock(&ddebug_lock
);
201 if (!nfound
&& verbose
)
202 pr_info("no matches for query\n");
208 * Split the buffer `buf' into space-separated words.
209 * Handles simple " and ' quoting, i.e. without nested,
210 * embedded or escaped \". Return the number of words
213 static int ddebug_tokenize(char *buf
, char *words
[], int maxwords
)
220 /* Skip leading whitespace */
221 buf
= skip_spaces(buf
);
223 break; /* oh, it was trailing whitespace */
225 break; /* token starts comment, skip rest of line */
227 /* find `end' of word, whitespace separated or quoted */
228 if (*buf
== '"' || *buf
== '\'') {
230 for (end
= buf
; *end
&& *end
!= quote
; end
++)
233 pr_err("unclosed quote: %s\n", buf
);
234 return -EINVAL
; /* unclosed quote */
237 for (end
= buf
; *end
&& !isspace(*end
); end
++)
242 /* `buf' is start of word, `end' is one past its end */
243 if (nwords
== maxwords
) {
244 pr_err("too many words, legal max <=%d\n", maxwords
);
245 return -EINVAL
; /* ran out of words[] before bytes */
248 *end
++ = '\0'; /* terminate the word */
249 words
[nwords
++] = buf
;
255 pr_info("split into words:");
256 for (i
= 0; i
< nwords
; i
++)
257 pr_cont(" \"%s\"", words
[i
]);
265 * Parse a single line number. Note that the empty string ""
266 * is treated as a special case and converted to zero, which
267 * is later treated as a "don't care" value.
269 static inline int parse_lineno(const char *str
, unsigned int *val
)
277 *val
= simple_strtoul(str
, &end
, 10);
278 if (end
== NULL
|| end
== str
|| *end
!= '\0') {
279 pr_err("bad line-number: %s\n", str
);
285 static int check_set(const char **dest
, char *src
, char *name
)
291 pr_err("match-spec:%s val:%s overridden by %s\n",
299 * Parse words[] as a ddebug query specification, which is a series
300 * of (keyword, value) pairs chosen from these possibilities:
302 * func <function-name>
303 * file <full-pathname>
304 * file <base-filename>
305 * module <module-name>
306 * format <escaped-string-to-find-in-format>
308 * line <first-lineno>-<last-lineno> // where either may be empty
310 * Only 1 of each type is allowed.
311 * Returns 0 on success, <0 on error.
313 static int ddebug_parse_query(char *words
[], int nwords
,
314 struct ddebug_query
*query
, const char *modname
)
319 /* check we have an even number of words */
320 if (nwords
% 2 != 0) {
321 pr_err("expecting pairs of match-spec <value>\n");
324 memset(query
, 0, sizeof(*query
));
327 /* support $modname.dyndbg=<multiple queries> */
328 query
->module
= modname
;
330 for (i
= 0; i
< nwords
; i
+= 2) {
331 if (!strcmp(words
[i
], "func")) {
332 rc
= check_set(&query
->function
, words
[i
+1], "func");
333 } else if (!strcmp(words
[i
], "file")) {
334 rc
= check_set(&query
->filename
, words
[i
+1], "file");
335 } else if (!strcmp(words
[i
], "module")) {
336 rc
= check_set(&query
->module
, words
[i
+1], "module");
337 } else if (!strcmp(words
[i
], "format")) {
338 string_unescape_inplace(words
[i
+1], UNESCAPE_SPACE
|
341 rc
= check_set(&query
->format
, words
[i
+1], "format");
342 } else if (!strcmp(words
[i
], "line")) {
343 char *first
= words
[i
+1];
344 char *last
= strchr(first
, '-');
345 if (query
->first_lineno
|| query
->last_lineno
) {
346 pr_err("match-spec: line used 2x\n");
351 if (parse_lineno(first
, &query
->first_lineno
) < 0) {
352 pr_err("line-number is <0\n");
356 /* range <first>-<last> */
357 if (parse_lineno(last
, &query
->last_lineno
)
358 < query
->first_lineno
) {
359 pr_err("last-line:%d < 1st-line:%d\n",
361 query
->first_lineno
);
365 query
->last_lineno
= query
->first_lineno
;
368 pr_err("unknown keyword \"%s\"\n", words
[i
]);
374 vpr_info_dq(query
, "parsed");
379 * Parse `str' as a flags specification, format [-+=][p]+.
380 * Sets up *maskp and *flagsp to be used when changing the
381 * flags fields of matched _ddebug's. Returns 0 on success
384 static int ddebug_parse_flags(const char *str
, unsigned int *flagsp
,
397 pr_err("bad flag-op %c, at start of %s\n", *str
, str
);
400 vpr_info("op='%c'\n", op
);
402 for (; *str
; ++str
) {
403 for (i
= ARRAY_SIZE(opt_array
) - 1; i
>= 0; i
--) {
404 if (*str
== opt_array
[i
].opt_char
) {
405 flags
|= opt_array
[i
].flag
;
410 pr_err("unknown flag '%c' in \"%s\"\n", *str
, str
);
414 vpr_info("flags=0x%x\n", flags
);
416 /* calculate final *flagsp, *maskp according to mask and op */
431 vpr_info("*flagsp=0x%x *maskp=0x%x\n", *flagsp
, *maskp
);
435 static int ddebug_exec_query(char *query_string
, const char *modname
)
437 unsigned int flags
= 0, mask
= 0;
438 struct ddebug_query query
;
441 char *words
[MAXWORDS
];
443 nwords
= ddebug_tokenize(query_string
, words
, MAXWORDS
);
445 pr_err("tokenize failed\n");
448 /* check flags 1st (last arg) so query is pairs of spec,val */
449 if (ddebug_parse_flags(words
[nwords
-1], &flags
, &mask
)) {
450 pr_err("flags parse failed\n");
453 if (ddebug_parse_query(words
, nwords
-1, &query
, modname
)) {
454 pr_err("query parse failed\n");
457 /* actually go and implement the change */
458 nfound
= ddebug_change(&query
, flags
, mask
);
459 vpr_info_dq(&query
, nfound
? "applied" : "no-match");
464 /* handle multiple queries in query string, continue on error, return
465 last error or number of matching callsites. Module name is either
466 in param (for boot arg) or perhaps in query string.
468 static int ddebug_exec_queries(char *query
, const char *modname
)
471 int i
, errs
= 0, exitcode
= 0, rc
, nfound
= 0;
473 for (i
= 0; query
; query
= split
) {
474 split
= strpbrk(query
, ";\n");
478 query
= skip_spaces(query
);
479 if (!query
|| !*query
|| *query
== '#')
482 vpr_info("query %d: \"%s\"\n", i
, query
);
484 rc
= ddebug_exec_query(query
, modname
);
493 vpr_info("processed %d queries, with %d matches, %d errs\n",
501 #define PREFIX_SIZE 64
503 static int remaining(int wrote
)
505 if (PREFIX_SIZE
- wrote
> 0)
506 return PREFIX_SIZE
- wrote
;
510 static char *dynamic_emit_prefix(const struct _ddebug
*desc
, char *buf
)
517 if (desc
->flags
& _DPRINTK_FLAGS_INCL_TID
) {
519 pos
+= snprintf(buf
+ pos
, remaining(pos
), "<intr> ");
521 pos
+= snprintf(buf
+ pos
, remaining(pos
), "[%d] ",
522 task_pid_vnr(current
));
525 if (desc
->flags
& _DPRINTK_FLAGS_INCL_MODNAME
)
526 pos
+= snprintf(buf
+ pos
, remaining(pos
), "%s:",
528 if (desc
->flags
& _DPRINTK_FLAGS_INCL_FUNCNAME
)
529 pos
+= snprintf(buf
+ pos
, remaining(pos
), "%s:",
531 if (desc
->flags
& _DPRINTK_FLAGS_INCL_LINENO
)
532 pos
+= snprintf(buf
+ pos
, remaining(pos
), "%d:",
534 if (pos
- pos_after_tid
)
535 pos
+= snprintf(buf
+ pos
, remaining(pos
), " ");
536 if (pos
>= PREFIX_SIZE
)
537 buf
[PREFIX_SIZE
- 1] = '\0';
542 int __dynamic_pr_debug(struct _ddebug
*descriptor
, const char *fmt
, ...)
546 struct va_format vaf
;
547 char buf
[PREFIX_SIZE
];
557 res
= printk(KERN_DEBUG
"%s%pV",
558 dynamic_emit_prefix(descriptor
, buf
), &vaf
);
564 EXPORT_SYMBOL(__dynamic_pr_debug
);
566 int __dynamic_dev_dbg(struct _ddebug
*descriptor
,
567 const struct device
*dev
, const char *fmt
, ...)
569 struct va_format vaf
;
582 res
= printk(KERN_DEBUG
"(NULL device *): %pV", &vaf
);
584 char buf
[PREFIX_SIZE
];
586 res
= dev_printk_emit(7, dev
, "%s%s %s: %pV",
587 dynamic_emit_prefix(descriptor
, buf
),
588 dev_driver_string(dev
), dev_name(dev
),
596 EXPORT_SYMBOL(__dynamic_dev_dbg
);
600 int __dynamic_netdev_dbg(struct _ddebug
*descriptor
,
601 const struct net_device
*dev
, const char *fmt
, ...)
603 struct va_format vaf
;
615 if (dev
&& dev
->dev
.parent
) {
616 char buf
[PREFIX_SIZE
];
618 res
= dev_printk_emit(7, dev
->dev
.parent
,
620 dynamic_emit_prefix(descriptor
, buf
),
621 dev_driver_string(dev
->dev
.parent
),
622 dev_name(dev
->dev
.parent
),
623 netdev_name(dev
), &vaf
);
625 res
= printk(KERN_DEBUG
"%s: %pV", netdev_name(dev
), &vaf
);
627 res
= printk(KERN_DEBUG
"(NULL net_device): %pV", &vaf
);
634 EXPORT_SYMBOL(__dynamic_netdev_dbg
);
638 #define DDEBUG_STRING_SIZE 1024
639 static __initdata
char ddebug_setup_string
[DDEBUG_STRING_SIZE
];
641 static __init
int ddebug_setup_query(char *str
)
643 if (strlen(str
) >= DDEBUG_STRING_SIZE
) {
644 pr_warn("ddebug boot param string too large\n");
647 strlcpy(ddebug_setup_string
, str
, DDEBUG_STRING_SIZE
);
651 __setup("ddebug_query=", ddebug_setup_query
);
654 * File_ops->write method for <debugfs>/dynamic_debug/conrol. Gathers the
655 * command text from userspace, parses and executes it.
657 #define USER_BUF_PAGE 4096
658 static ssize_t
ddebug_proc_write(struct file
*file
, const char __user
*ubuf
,
659 size_t len
, loff_t
*offp
)
666 if (len
> USER_BUF_PAGE
- 1) {
667 pr_warn("expected <%d bytes into control\n", USER_BUF_PAGE
);
670 tmpbuf
= kmalloc(len
+ 1, GFP_KERNEL
);
673 if (copy_from_user(tmpbuf
, ubuf
, len
)) {
678 vpr_info("read %d bytes from userspace\n", (int)len
);
680 ret
= ddebug_exec_queries(tmpbuf
, NULL
);
690 * Set the iterator to point to the first _ddebug object
691 * and return a pointer to that first object. Returns
692 * NULL if there are no _ddebugs at all.
694 static struct _ddebug
*ddebug_iter_first(struct ddebug_iter
*iter
)
696 if (list_empty(&ddebug_tables
)) {
701 iter
->table
= list_entry(ddebug_tables
.next
,
702 struct ddebug_table
, link
);
704 return &iter
->table
->ddebugs
[iter
->idx
];
708 * Advance the iterator to point to the next _ddebug
709 * object from the one the iterator currently points at,
710 * and returns a pointer to the new _ddebug. Returns
711 * NULL if the iterator has seen all the _ddebugs.
713 static struct _ddebug
*ddebug_iter_next(struct ddebug_iter
*iter
)
715 if (iter
->table
== NULL
)
717 if (++iter
->idx
== iter
->table
->num_ddebugs
) {
718 /* iterate to next table */
720 if (list_is_last(&iter
->table
->link
, &ddebug_tables
)) {
724 iter
->table
= list_entry(iter
->table
->link
.next
,
725 struct ddebug_table
, link
);
727 return &iter
->table
->ddebugs
[iter
->idx
];
731 * Seq_ops start method. Called at the start of every
732 * read() call from userspace. Takes the ddebug_lock and
733 * seeks the seq_file's iterator to the given position.
735 static void *ddebug_proc_start(struct seq_file
*m
, loff_t
*pos
)
737 struct ddebug_iter
*iter
= m
->private;
741 vpr_info("called m=%p *pos=%lld\n", m
, (unsigned long long)*pos
);
743 mutex_lock(&ddebug_lock
);
746 return SEQ_START_TOKEN
;
749 dp
= ddebug_iter_first(iter
);
750 while (dp
!= NULL
&& --n
> 0)
751 dp
= ddebug_iter_next(iter
);
756 * Seq_ops next method. Called several times within a read()
757 * call from userspace, with ddebug_lock held. Walks to the
758 * next _ddebug object with a special case for the header line.
760 static void *ddebug_proc_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
762 struct ddebug_iter
*iter
= m
->private;
765 vpr_info("called m=%p p=%p *pos=%lld\n",
766 m
, p
, (unsigned long long)*pos
);
768 if (p
== SEQ_START_TOKEN
)
769 dp
= ddebug_iter_first(iter
);
771 dp
= ddebug_iter_next(iter
);
777 * Seq_ops show method. Called several times within a read()
778 * call from userspace, with ddebug_lock held. Formats the
779 * current _ddebug as a single human-readable line, with a
780 * special case for the header line.
782 static int ddebug_proc_show(struct seq_file
*m
, void *p
)
784 struct ddebug_iter
*iter
= m
->private;
785 struct _ddebug
*dp
= p
;
788 vpr_info("called m=%p p=%p\n", m
, p
);
790 if (p
== SEQ_START_TOKEN
) {
792 "# filename:lineno [module]function flags format\n");
796 seq_printf(m
, "%s:%u [%s]%s =%s \"",
797 trim_prefix(dp
->filename
), dp
->lineno
,
798 iter
->table
->mod_name
, dp
->function
,
799 ddebug_describe_flags(dp
, flagsbuf
, sizeof(flagsbuf
)));
800 seq_escape(m
, dp
->format
, "\t\r\n\"");
807 * Seq_ops stop method. Called at the end of each read()
808 * call from userspace. Drops ddebug_lock.
810 static void ddebug_proc_stop(struct seq_file
*m
, void *p
)
812 vpr_info("called m=%p p=%p\n", m
, p
);
813 mutex_unlock(&ddebug_lock
);
816 static const struct seq_operations ddebug_proc_seqops
= {
817 .start
= ddebug_proc_start
,
818 .next
= ddebug_proc_next
,
819 .show
= ddebug_proc_show
,
820 .stop
= ddebug_proc_stop
824 * File_ops->open method for <debugfs>/dynamic_debug/control. Does
825 * the seq_file setup dance, and also creates an iterator to walk the
826 * _ddebugs. Note that we create a seq_file always, even for O_WRONLY
827 * files where it's not needed, as doing so simplifies the ->release
830 static int ddebug_proc_open(struct inode
*inode
, struct file
*file
)
832 struct ddebug_iter
*iter
;
835 vpr_info("called\n");
837 iter
= kzalloc(sizeof(*iter
), GFP_KERNEL
);
841 err
= seq_open(file
, &ddebug_proc_seqops
);
846 ((struct seq_file
*)file
->private_data
)->private = iter
;
850 static const struct file_operations ddebug_proc_fops
= {
851 .owner
= THIS_MODULE
,
852 .open
= ddebug_proc_open
,
855 .release
= seq_release_private
,
856 .write
= ddebug_proc_write
860 * Allocate a new ddebug_table for the given module
861 * and add it to the global list.
863 int ddebug_add_module(struct _ddebug
*tab
, unsigned int n
,
866 struct ddebug_table
*dt
;
869 dt
= kzalloc(sizeof(*dt
), GFP_KERNEL
);
872 new_name
= kstrdup(name
, GFP_KERNEL
);
873 if (new_name
== NULL
) {
877 dt
->mod_name
= new_name
;
881 mutex_lock(&ddebug_lock
);
882 list_add_tail(&dt
->link
, &ddebug_tables
);
883 mutex_unlock(&ddebug_lock
);
885 vpr_info("%u debug prints in module %s\n", n
, dt
->mod_name
);
888 EXPORT_SYMBOL_GPL(ddebug_add_module
);
890 /* helper for ddebug_dyndbg_(boot|module)_param_cb */
891 static int ddebug_dyndbg_param_cb(char *param
, char *val
,
892 const char *modname
, int on_err
)
896 sep
= strchr(param
, '.');
898 /* needed only for ddebug_dyndbg_boot_param_cb */
903 if (strcmp(param
, "dyndbg"))
904 return on_err
; /* determined by caller */
906 ddebug_exec_queries((val
? val
: "+p"), modname
);
908 return 0; /* query failure shouldnt stop module load */
911 /* handle both dyndbg and $module.dyndbg params at boot */
912 static int ddebug_dyndbg_boot_param_cb(char *param
, char *val
,
915 vpr_info("%s=\"%s\"\n", param
, val
);
916 return ddebug_dyndbg_param_cb(param
, val
, NULL
, 0);
920 * modprobe foo finds foo.params in boot-args, strips "foo.", and
921 * passes them to load_module(). This callback gets unknown params,
922 * processes dyndbg params, rejects others.
924 int ddebug_dyndbg_module_param_cb(char *param
, char *val
, const char *module
)
926 vpr_info("module: %s %s=\"%s\"\n", module
, param
, val
);
927 return ddebug_dyndbg_param_cb(param
, val
, module
, -ENOENT
);
930 static void ddebug_table_free(struct ddebug_table
*dt
)
932 list_del_init(&dt
->link
);
938 * Called in response to a module being unloaded. Removes
939 * any ddebug_table's which point at the module.
941 int ddebug_remove_module(const char *mod_name
)
943 struct ddebug_table
*dt
, *nextdt
;
946 vpr_info("removing module \"%s\"\n", mod_name
);
948 mutex_lock(&ddebug_lock
);
949 list_for_each_entry_safe(dt
, nextdt
, &ddebug_tables
, link
) {
950 if (!strcmp(dt
->mod_name
, mod_name
)) {
951 ddebug_table_free(dt
);
955 mutex_unlock(&ddebug_lock
);
958 EXPORT_SYMBOL_GPL(ddebug_remove_module
);
960 static void ddebug_remove_all_tables(void)
962 mutex_lock(&ddebug_lock
);
963 while (!list_empty(&ddebug_tables
)) {
964 struct ddebug_table
*dt
= list_entry(ddebug_tables
.next
,
967 ddebug_table_free(dt
);
969 mutex_unlock(&ddebug_lock
);
972 static __initdata
int ddebug_init_success
;
974 static int __init
dynamic_debug_init_debugfs(void)
976 struct dentry
*dir
, *file
;
978 if (!ddebug_init_success
)
981 dir
= debugfs_create_dir("dynamic_debug", NULL
);
984 file
= debugfs_create_file("control", 0644, dir
, NULL
,
993 static int __init
dynamic_debug_init(void)
995 struct _ddebug
*iter
, *iter_start
;
996 const char *modname
= NULL
;
999 int n
= 0, entries
= 0, modct
= 0;
1000 int verbose_bytes
= 0;
1002 if (__start___verbose
== __stop___verbose
) {
1003 pr_warn("_ddebug table is empty in a CONFIG_DYNAMIC_DEBUG build\n");
1006 iter
= __start___verbose
;
1007 modname
= iter
->modname
;
1009 for (; iter
< __stop___verbose
; iter
++) {
1011 verbose_bytes
+= strlen(iter
->modname
) + strlen(iter
->function
)
1012 + strlen(iter
->filename
) + strlen(iter
->format
);
1014 if (strcmp(modname
, iter
->modname
)) {
1016 ret
= ddebug_add_module(iter_start
, n
, modname
);
1020 modname
= iter
->modname
;
1025 ret
= ddebug_add_module(iter_start
, n
, modname
);
1029 ddebug_init_success
= 1;
1030 vpr_info("%d modules, %d entries and %d bytes in ddebug tables, %d bytes in (readonly) verbose section\n",
1031 modct
, entries
, (int)(modct
* sizeof(struct ddebug_table
)),
1032 verbose_bytes
+ (int)(__stop___verbose
- __start___verbose
));
1034 /* apply ddebug_query boot param, dont unload tables on err */
1035 if (ddebug_setup_string
[0] != '\0') {
1036 pr_warn("ddebug_query param name is deprecated, change it to dyndbg\n");
1037 ret
= ddebug_exec_queries(ddebug_setup_string
, NULL
);
1039 pr_warn("Invalid ddebug boot param %s\n",
1040 ddebug_setup_string
);
1042 pr_info("%d changes by ddebug_query\n", ret
);
1044 /* now that ddebug tables are loaded, process all boot args
1045 * again to find and activate queries given in dyndbg params.
1046 * While this has already been done for known boot params, it
1047 * ignored the unknown ones (dyndbg in particular). Reusing
1048 * parse_args avoids ad-hoc parsing. This will also attempt
1049 * to activate queries for not-yet-loaded modules, which is
1050 * slightly noisy if verbose, but harmless.
1052 cmdline
= kstrdup(saved_command_line
, GFP_KERNEL
);
1053 parse_args("dyndbg params", cmdline
, NULL
,
1054 0, 0, 0, &ddebug_dyndbg_boot_param_cb
);
1059 ddebug_remove_all_tables();
1062 /* Allow early initialization for boot messages via boot param */
1063 early_initcall(dynamic_debug_init
);
1065 /* Debugfs setup must be done later */
1066 fs_initcall(dynamic_debug_init_debugfs
);