2 * arch/s390/kernel/debug.c
5 * Copyright (C) 1999, 2000 IBM Deutschland Entwicklung GmbH,
7 * Author(s): Michael Holzheu (holzheu@de.ibm.com),
8 * Holger Smolinski (Holger.Smolinski@de.ibm.com)
10 * Bugreports to: <Linux390@de.ibm.com>
13 #define KMSG_COMPONENT "s390dbf"
14 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
16 #include <linux/stddef.h>
17 #include <linux/kernel.h>
18 #include <linux/errno.h>
19 #include <linux/slab.h>
20 #include <linux/ctype.h>
21 #include <linux/sysctl.h>
22 #include <asm/uaccess.h>
23 #include <linux/module.h>
24 #include <linux/init.h>
26 #include <linux/debugfs.h>
28 #include <asm/debug.h>
30 #define DEBUG_PROLOG_ENTRY -1
32 #define ALL_AREAS 0 /* copy all debug areas */
33 #define NO_AREAS 1 /* copy no debug areas */
37 typedef struct file_private_info {
38 loff_t offset; /* offset of last read in file */
39 int act_area; /* number of last formated area */
40 int act_page; /* act page in given area */
41 int act_entry; /* last formated entry (offset */
42 /* relative to beginning of last */
44 size_t act_entry_offset; /* up to this offset we copied */
45 /* in last read the last formated */
46 /* entry to userland */
47 char temp_buf[2048]; /* buffer for output */
48 debug_info_t *debug_info_org; /* original debug information */
49 debug_info_t *debug_info_snap; /* snapshot of debug information */
50 struct debug_view *view; /* used view of debug info */
51 } file_private_info_t;
57 * This assumes that all args are converted into longs
58 * on L/390 this is the case for all types of parameter
59 * except of floats, and long long (32 bit)
63 } debug_sprintf_entry_t;
66 /* internal function prototyes */
68 static int debug_init(void);
69 static ssize_t debug_output(struct file *file, char __user *user_buf,
70 size_t user_len, loff_t * offset);
71 static ssize_t debug_input(struct file *file, const char __user *user_buf,
72 size_t user_len, loff_t * offset);
73 static int debug_open(struct inode *inode, struct file *file);
74 static int debug_close(struct inode *inode, struct file *file);
75 static debug_info_t *debug_info_create(const char *name, int pages_per_area,
76 int nr_areas, int buf_size, mode_t mode);
77 static void debug_info_get(debug_info_t *);
78 static void debug_info_put(debug_info_t *);
79 static int debug_prolog_level_fn(debug_info_t * id,
80 struct debug_view *view, char *out_buf);
81 static int debug_input_level_fn(debug_info_t * id, struct debug_view *view,
82 struct file *file, const char __user *user_buf,
83 size_t user_buf_size, loff_t * offset);
84 static int debug_prolog_pages_fn(debug_info_t * id,
85 struct debug_view *view, char *out_buf);
86 static int debug_input_pages_fn(debug_info_t * id, struct debug_view *view,
87 struct file *file, const char __user *user_buf,
88 size_t user_buf_size, loff_t * offset);
89 static int debug_input_flush_fn(debug_info_t * id, struct debug_view *view,
90 struct file *file, const char __user *user_buf,
91 size_t user_buf_size, loff_t * offset);
92 static int debug_hex_ascii_format_fn(debug_info_t * id, struct debug_view *view,
93 char *out_buf, const char *in_buf);
94 static int debug_raw_format_fn(debug_info_t * id,
95 struct debug_view *view, char *out_buf,
97 static int debug_raw_header_fn(debug_info_t * id, struct debug_view *view,
98 int area, debug_entry_t * entry, char *out_buf);
100 static int debug_sprintf_format_fn(debug_info_t * id, struct debug_view *view,
101 char *out_buf, debug_sprintf_entry_t *curr_event);
105 struct debug_view debug_raw_view = {
108 &debug_raw_header_fn,
109 &debug_raw_format_fn,
114 struct debug_view debug_hex_ascii_view = {
117 &debug_dflt_header_fn,
118 &debug_hex_ascii_format_fn,
123 static struct debug_view debug_level_view = {
125 &debug_prolog_level_fn,
128 &debug_input_level_fn,
132 static struct debug_view debug_pages_view = {
134 &debug_prolog_pages_fn,
137 &debug_input_pages_fn,
141 static struct debug_view debug_flush_view = {
146 &debug_input_flush_fn,
150 struct debug_view debug_sprintf_view = {
153 &debug_dflt_header_fn,
154 (debug_format_proc_t*)&debug_sprintf_format_fn,
159 /* used by dump analysis tools to determine version of debug feature */
160 static unsigned int __used debug_feature_version = __DEBUG_FEATURE_VERSION;
164 static debug_info_t *debug_area_first = NULL;
165 static debug_info_t *debug_area_last = NULL;
166 static DEFINE_MUTEX(debug_mutex);
168 static int initialized;
170 static const struct file_operations debug_file_ops = {
171 .owner = THIS_MODULE,
172 .read = debug_output,
173 .write = debug_input,
175 .release = debug_close,
178 static struct dentry *debug_debugfs_root_entry;
184 * - Debug areas are implemented as a threedimensonal array:
185 * areas[areanumber][pagenumber][pageoffset]
188 static debug_entry_t***
189 debug_areas_alloc(int pages_per_area, int nr_areas)
191 debug_entry_t*** areas;
194 areas = kmalloc(nr_areas *
195 sizeof(debug_entry_t**),
198 goto fail_malloc_areas;
199 for (i = 0; i < nr_areas; i++) {
200 areas[i] = kmalloc(pages_per_area *
201 sizeof(debug_entry_t*),GFP_KERNEL);
203 goto fail_malloc_areas2;
205 for(j = 0; j < pages_per_area; j++) {
206 areas[i][j] = kzalloc(PAGE_SIZE, GFP_KERNEL);
208 for(j--; j >=0 ; j--) {
212 goto fail_malloc_areas2;
219 for(i--; i >= 0; i--){
220 for(j=0; j < pages_per_area;j++){
234 * - alloc new debug-info
238 debug_info_alloc(const char *name, int pages_per_area, int nr_areas,
239 int buf_size, int level, int mode)
243 /* alloc everything */
245 rc = kmalloc(sizeof(debug_info_t), GFP_KERNEL);
248 rc->active_entries = kcalloc(nr_areas, sizeof(int), GFP_KERNEL);
249 if(!rc->active_entries)
250 goto fail_malloc_active_entries;
251 rc->active_pages = kcalloc(nr_areas, sizeof(int), GFP_KERNEL);
252 if(!rc->active_pages)
253 goto fail_malloc_active_pages;
254 if((mode == ALL_AREAS) && (pages_per_area != 0)){
255 rc->areas = debug_areas_alloc(pages_per_area, nr_areas);
257 goto fail_malloc_areas;
262 /* initialize members */
264 spin_lock_init(&rc->lock);
265 rc->pages_per_area = pages_per_area;
266 rc->nr_areas = nr_areas;
269 rc->buf_size = buf_size;
270 rc->entry_size = sizeof(debug_entry_t) + buf_size;
271 strlcpy(rc->name, name, sizeof(rc->name));
272 memset(rc->views, 0, DEBUG_MAX_VIEWS * sizeof(struct debug_view *));
273 memset(rc->debugfs_entries, 0 ,DEBUG_MAX_VIEWS *
274 sizeof(struct dentry*));
275 atomic_set(&(rc->ref_count), 0);
280 kfree(rc->active_pages);
281 fail_malloc_active_pages:
282 kfree(rc->active_entries);
283 fail_malloc_active_entries:
291 * - free all debug areas
295 debug_areas_free(debug_info_t* db_info)
301 for (i = 0; i < db_info->nr_areas; i++) {
302 for(j = 0; j < db_info->pages_per_area; j++) {
303 kfree(db_info->areas[i][j]);
305 kfree(db_info->areas[i]);
307 kfree(db_info->areas);
308 db_info->areas = NULL;
313 * - free memory debug-info
317 debug_info_free(debug_info_t* db_info){
318 debug_areas_free(db_info);
319 kfree(db_info->active_entries);
320 kfree(db_info->active_pages);
326 * - create new debug-info
330 debug_info_create(const char *name, int pages_per_area, int nr_areas,
331 int buf_size, mode_t mode)
335 rc = debug_info_alloc(name, pages_per_area, nr_areas, buf_size,
336 DEBUG_DEFAULT_LEVEL, ALL_AREAS);
340 rc->mode = mode & ~S_IFMT;
342 /* create root directory */
343 rc->debugfs_root_entry = debugfs_create_dir(rc->name,
344 debug_debugfs_root_entry);
346 /* append new element to linked list */
347 if (!debug_area_first) {
348 /* first element in list */
349 debug_area_first = rc;
352 /* append element to end of list */
353 debug_area_last->next = rc;
354 rc->prev = debug_area_last;
356 debug_area_last = rc;
370 debug_info_copy(debug_info_t* in, int mode)
376 /* get a consistent copy of the debug areas */
378 rc = debug_info_alloc(in->name, in->pages_per_area,
379 in->nr_areas, in->buf_size, in->level, mode);
380 spin_lock_irqsave(&in->lock, flags);
383 /* has something changed in the meantime ? */
384 if((rc->pages_per_area == in->pages_per_area) &&
385 (rc->nr_areas == in->nr_areas)) {
388 spin_unlock_irqrestore(&in->lock, flags);
392 if (mode == NO_AREAS)
395 for(i = 0; i < in->nr_areas; i++){
396 for(j = 0; j < in->pages_per_area; j++) {
397 memcpy(rc->areas[i][j], in->areas[i][j],PAGE_SIZE);
401 spin_unlock_irqrestore(&in->lock, flags);
407 * - increments reference count for debug-info
411 debug_info_get(debug_info_t * db_info)
414 atomic_inc(&db_info->ref_count);
419 * - decreases reference count for debug-info and frees it if necessary
423 debug_info_put(debug_info_t *db_info)
429 if (atomic_dec_and_test(&db_info->ref_count)) {
430 for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
431 if (!db_info->views[i])
433 debugfs_remove(db_info->debugfs_entries[i]);
435 debugfs_remove(db_info->debugfs_root_entry);
436 if(db_info == debug_area_first)
437 debug_area_first = db_info->next;
438 if(db_info == debug_area_last)
439 debug_area_last = db_info->prev;
440 if(db_info->prev) db_info->prev->next = db_info->next;
441 if(db_info->next) db_info->next->prev = db_info->prev;
442 debug_info_free(db_info);
447 * debug_format_entry:
448 * - format one debug entry and return size of formated data
452 debug_format_entry(file_private_info_t *p_info)
454 debug_info_t *id_snap = p_info->debug_info_snap;
455 struct debug_view *view = p_info->view;
456 debug_entry_t *act_entry;
458 if(p_info->act_entry == DEBUG_PROLOG_ENTRY){
460 if (view->prolog_proc)
461 len += view->prolog_proc(id_snap,view,p_info->temp_buf);
464 if (!id_snap->areas) /* this is true, if we have a prolog only view */
465 goto out; /* or if 'pages_per_area' is 0 */
466 act_entry = (debug_entry_t *) ((char*)id_snap->areas[p_info->act_area]
467 [p_info->act_page] + p_info->act_entry);
469 if (act_entry->id.stck == 0LL)
470 goto out; /* empty entry */
471 if (view->header_proc)
472 len += view->header_proc(id_snap, view, p_info->act_area,
473 act_entry, p_info->temp_buf + len);
474 if (view->format_proc)
475 len += view->format_proc(id_snap, view, p_info->temp_buf + len,
476 DEBUG_DATA(act_entry));
483 * - goto next entry in p_info
487 debug_next_entry(file_private_info_t *p_info)
491 id = p_info->debug_info_snap;
492 if(p_info->act_entry == DEBUG_PROLOG_ENTRY){
493 p_info->act_entry = 0;
494 p_info->act_page = 0;
499 p_info->act_entry += id->entry_size;
500 /* switch to next page, if we reached the end of the page */
501 if (p_info->act_entry > (PAGE_SIZE - id->entry_size)){
503 p_info->act_entry = 0;
504 p_info->act_page += 1;
505 if((p_info->act_page % id->pages_per_area) == 0) {
510 if(p_info->act_area >= id->nr_areas)
519 * - called for user read()
520 * - copies formated debug entries to the user buffer
524 debug_output(struct file *file, /* file descriptor */
525 char __user *user_buf, /* user buffer */
526 size_t len, /* length of buffer */
527 loff_t *offset) /* offset in the file */
531 file_private_info_t *p_info;
533 p_info = ((file_private_info_t *) file->private_data);
534 if (*offset != p_info->offset)
536 if(p_info->act_area >= p_info->debug_info_snap->nr_areas)
538 entry_offset = p_info->act_entry_offset;
540 int formatted_line_size;
541 int formatted_line_residue;
542 int user_buf_residue;
545 formatted_line_size = debug_format_entry(p_info);
546 formatted_line_residue = formatted_line_size - entry_offset;
547 user_buf_residue = len-count;
548 copy_size = min(user_buf_residue, formatted_line_residue);
550 if (copy_to_user(user_buf + count, p_info->temp_buf
551 + entry_offset, copy_size))
554 entry_offset += copy_size;
556 if(copy_size == formatted_line_residue){
558 if(debug_next_entry(p_info))
563 p_info->offset = *offset + count;
564 p_info->act_entry_offset = entry_offset;
565 *offset = p_info->offset;
571 * - called for user write()
572 * - calls input function of view
576 debug_input(struct file *file, const char __user *user_buf, size_t length,
580 file_private_info_t *p_info;
582 mutex_lock(&debug_mutex);
583 p_info = ((file_private_info_t *) file->private_data);
584 if (p_info->view->input_proc)
585 rc = p_info->view->input_proc(p_info->debug_info_org,
586 p_info->view, file, user_buf,
590 mutex_unlock(&debug_mutex);
591 return rc; /* number of input characters */
596 * - called for user open()
597 * - copies formated output to private_data area of the file
602 debug_open(struct inode *inode, struct file *file)
605 file_private_info_t *p_info;
606 debug_info_t *debug_info, *debug_info_snapshot;
608 mutex_lock(&debug_mutex);
609 debug_info = file->f_path.dentry->d_inode->i_private;
610 /* find debug view */
611 for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
612 if (!debug_info->views[i])
614 else if (debug_info->debugfs_entries[i] ==
615 file->f_path.dentry) {
616 goto found; /* found view ! */
625 /* Make snapshot of current debug areas to get it consistent. */
626 /* To copy all the areas is only needed, if we have a view which */
627 /* formats the debug areas. */
629 if(!debug_info->views[i]->format_proc &&
630 !debug_info->views[i]->header_proc){
631 debug_info_snapshot = debug_info_copy(debug_info, NO_AREAS);
633 debug_info_snapshot = debug_info_copy(debug_info, ALL_AREAS);
636 if(!debug_info_snapshot){
640 p_info = kmalloc(sizeof(file_private_info_t),
643 debug_info_free(debug_info_snapshot);
648 p_info->debug_info_snap = debug_info_snapshot;
649 p_info->debug_info_org = debug_info;
650 p_info->view = debug_info->views[i];
651 p_info->act_area = 0;
652 p_info->act_page = 0;
653 p_info->act_entry = DEBUG_PROLOG_ENTRY;
654 p_info->act_entry_offset = 0;
655 file->private_data = p_info;
656 debug_info_get(debug_info);
658 mutex_unlock(&debug_mutex);
664 * - called for user close()
665 * - deletes private_data area of the file handle
669 debug_close(struct inode *inode, struct file *file)
671 file_private_info_t *p_info;
672 p_info = (file_private_info_t *) file->private_data;
673 if(p_info->debug_info_snap)
674 debug_info_free(p_info->debug_info_snap);
675 debug_info_put(p_info->debug_info_org);
676 kfree(file->private_data);
677 return 0; /* success */
681 * debug_register_mode:
682 * - Creates and initializes debug area for the caller
683 * The mode parameter allows to specify access rights for the s390dbf files
684 * - Returns handle for debug area
687 debug_info_t *debug_register_mode(const char *name, int pages_per_area,
688 int nr_areas, int buf_size, mode_t mode,
689 uid_t uid, gid_t gid)
691 debug_info_t *rc = NULL;
693 /* Since debugfs currently does not support uid/gid other than root, */
694 /* we do not allow gid/uid != 0 until we get support for that. */
695 if ((uid != 0) || (gid != 0))
696 pr_warning("Root becomes the owner of all s390dbf files "
698 BUG_ON(!initialized);
699 mutex_lock(&debug_mutex);
701 /* create new debug_info */
703 rc = debug_info_create(name, pages_per_area, nr_areas, buf_size, mode);
706 debug_register_view(rc, &debug_level_view);
707 debug_register_view(rc, &debug_flush_view);
708 debug_register_view(rc, &debug_pages_view);
711 pr_err("Registering debug feature %s failed\n", name);
713 mutex_unlock(&debug_mutex);
716 EXPORT_SYMBOL(debug_register_mode);
720 * - creates and initializes debug area for the caller
721 * - returns handle for debug area
724 debug_info_t *debug_register(const char *name, int pages_per_area,
725 int nr_areas, int buf_size)
727 return debug_register_mode(name, pages_per_area, nr_areas, buf_size,
728 S_IRUSR | S_IWUSR, 0, 0);
733 * - give back debug area
737 debug_unregister(debug_info_t * id)
741 mutex_lock(&debug_mutex);
743 mutex_unlock(&debug_mutex);
751 * - set area size (number of pages) and number of areas
754 debug_set_size(debug_info_t* id, int nr_areas, int pages_per_area)
757 debug_entry_t *** new_areas;
760 if(!id || (nr_areas <= 0) || (pages_per_area < 0))
762 if(pages_per_area > 0){
763 new_areas = debug_areas_alloc(pages_per_area, nr_areas);
765 pr_info("Allocating memory for %i pages failed\n",
773 spin_lock_irqsave(&id->lock,flags);
774 debug_areas_free(id);
775 id->areas = new_areas;
776 id->nr_areas = nr_areas;
777 id->pages_per_area = pages_per_area;
779 memset(id->active_entries,0,sizeof(int)*id->nr_areas);
780 memset(id->active_pages, 0, sizeof(int)*id->nr_areas);
781 spin_unlock_irqrestore(&id->lock,flags);
782 pr_info("%s: set new size (%i pages)\n" ,id->name, pages_per_area);
789 * - set actual debug level
793 debug_set_level(debug_info_t* id, int new_level)
798 spin_lock_irqsave(&id->lock,flags);
799 if(new_level == DEBUG_OFF_LEVEL){
800 id->level = DEBUG_OFF_LEVEL;
801 pr_info("%s: switched off\n",id->name);
802 } else if ((new_level > DEBUG_MAX_LEVEL) || (new_level < 0)) {
803 pr_info("%s: level %i is out of range (%i - %i)\n",
804 id->name, new_level, 0, DEBUG_MAX_LEVEL);
806 id->level = new_level;
808 spin_unlock_irqrestore(&id->lock,flags);
813 * proceed_active_entry:
814 * - set active entry to next in the ring buffer
818 proceed_active_entry(debug_info_t * id)
820 if ((id->active_entries[id->active_area] += id->entry_size)
821 > (PAGE_SIZE - id->entry_size)){
822 id->active_entries[id->active_area] = 0;
823 id->active_pages[id->active_area] =
824 (id->active_pages[id->active_area] + 1) %
830 * proceed_active_area:
831 * - set active area to next in the ring buffer
835 proceed_active_area(debug_info_t * id)
838 id->active_area = id->active_area % id->nr_areas;
845 static inline debug_entry_t*
846 get_active_entry(debug_info_t * id)
848 return (debug_entry_t *) (((char *) id->areas[id->active_area]
849 [id->active_pages[id->active_area]]) +
850 id->active_entries[id->active_area]);
854 * debug_finish_entry:
855 * - set timestamp, caller address, cpu number etc.
859 debug_finish_entry(debug_info_t * id, debug_entry_t* active, int level,
862 active->id.stck = get_clock();
863 active->id.fields.cpuid = smp_processor_id();
864 active->caller = __builtin_return_address(0);
865 active->id.fields.exception = exception;
866 active->id.fields.level = level;
867 proceed_active_entry(id);
869 proceed_active_area(id);
872 static int debug_stoppable=1;
873 static int debug_active=1;
875 #define CTL_S390DBF_STOPPABLE 5678
876 #define CTL_S390DBF_ACTIVE 5679
879 * proc handler for the running debug_active sysctl
880 * always allow read, allow write only if debug_stoppable is set or
881 * if debug_active is already off
884 s390dbf_procactive(ctl_table *table, int write,
885 void __user *buffer, size_t *lenp, loff_t *ppos)
887 if (!write || debug_stoppable || !debug_active)
888 return proc_dointvec(table, write, buffer, lenp, ppos);
894 static struct ctl_table s390dbf_table[] = {
896 .procname = "debug_stoppable",
897 .data = &debug_stoppable,
898 .maxlen = sizeof(int),
899 .mode = S_IRUGO | S_IWUSR,
900 .proc_handler = proc_dointvec,
903 .procname = "debug_active",
904 .data = &debug_active,
905 .maxlen = sizeof(int),
906 .mode = S_IRUGO | S_IWUSR,
907 .proc_handler = s390dbf_procactive,
912 static struct ctl_table s390dbf_dir_table[] = {
914 .procname = "s390dbf",
916 .mode = S_IRUGO | S_IXUGO,
917 .child = s390dbf_table,
922 static struct ctl_table_header *s390dbf_sysctl_header;
933 * debug_event_common:
934 * - write debug entry with given size
938 debug_event_common(debug_info_t * id, int level, const void *buf, int len)
941 debug_entry_t *active;
943 if (!debug_active || !id->areas)
945 spin_lock_irqsave(&id->lock, flags);
946 active = get_active_entry(id);
947 memset(DEBUG_DATA(active), 0, id->buf_size);
948 memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size));
949 debug_finish_entry(id, active, level, 0);
950 spin_unlock_irqrestore(&id->lock, flags);
956 * debug_exception_common:
957 * - write debug entry with given size and switch to next debug area
961 *debug_exception_common(debug_info_t * id, int level, const void *buf, int len)
964 debug_entry_t *active;
966 if (!debug_active || !id->areas)
968 spin_lock_irqsave(&id->lock, flags);
969 active = get_active_entry(id);
970 memset(DEBUG_DATA(active), 0, id->buf_size);
971 memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size));
972 debug_finish_entry(id, active, level, 1);
973 spin_unlock_irqrestore(&id->lock, flags);
979 * counts arguments in format string for sprintf view
983 debug_count_numargs(char *string)
995 * debug_sprintf_event:
999 debug_sprintf_event(debug_info_t* id, int level,char *string,...)
1003 unsigned long flags;
1004 debug_sprintf_entry_t *curr_event;
1005 debug_entry_t *active;
1007 if((!id) || (level > id->level))
1009 if (!debug_active || !id->areas)
1011 numargs=debug_count_numargs(string);
1013 spin_lock_irqsave(&id->lock, flags);
1014 active = get_active_entry(id);
1015 curr_event=(debug_sprintf_entry_t *) DEBUG_DATA(active);
1016 va_start(ap,string);
1017 curr_event->string=string;
1018 for(idx=0;idx<min(numargs,(int)(id->buf_size / sizeof(long))-1);idx++)
1019 curr_event->args[idx]=va_arg(ap,long);
1021 debug_finish_entry(id, active, level, 0);
1022 spin_unlock_irqrestore(&id->lock, flags);
1028 * debug_sprintf_exception:
1032 debug_sprintf_exception(debug_info_t* id, int level,char *string,...)
1036 unsigned long flags;
1037 debug_sprintf_entry_t *curr_event;
1038 debug_entry_t *active;
1040 if((!id) || (level > id->level))
1042 if (!debug_active || !id->areas)
1045 numargs=debug_count_numargs(string);
1047 spin_lock_irqsave(&id->lock, flags);
1048 active = get_active_entry(id);
1049 curr_event=(debug_sprintf_entry_t *)DEBUG_DATA(active);
1050 va_start(ap,string);
1051 curr_event->string=string;
1052 for(idx=0;idx<min(numargs,(int)(id->buf_size / sizeof(long))-1);idx++)
1053 curr_event->args[idx]=va_arg(ap,long);
1055 debug_finish_entry(id, active, level, 1);
1056 spin_unlock_irqrestore(&id->lock, flags);
1063 * - is called exactly once to initialize the debug feature
1067 __init debug_init(void)
1071 s390dbf_sysctl_header = register_sysctl_table(s390dbf_dir_table);
1072 mutex_lock(&debug_mutex);
1073 debug_debugfs_root_entry = debugfs_create_dir(DEBUG_DIR_ROOT,NULL);
1075 mutex_unlock(&debug_mutex);
1081 * debug_register_view:
1085 debug_register_view(debug_info_t * id, struct debug_view *view)
1089 unsigned long flags;
1095 mode = (id->mode | S_IFREG) & ~S_IXUGO;
1096 if (!(view->prolog_proc || view->format_proc || view->header_proc))
1097 mode &= ~(S_IRUSR | S_IRGRP | S_IROTH);
1098 if (!view->input_proc)
1099 mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
1100 pde = debugfs_create_file(view->name, mode, id->debugfs_root_entry,
1101 id , &debug_file_ops);
1103 pr_err("Registering view %s/%s failed due to out of "
1104 "memory\n", id->name,view->name);
1108 spin_lock_irqsave(&id->lock, flags);
1109 for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
1113 if (i == DEBUG_MAX_VIEWS) {
1114 pr_err("Registering view %s/%s would exceed the maximum "
1115 "number of views %i\n", id->name, view->name, i);
1116 debugfs_remove(pde);
1119 id->views[i] = view;
1120 id->debugfs_entries[i] = pde;
1122 spin_unlock_irqrestore(&id->lock, flags);
1128 * debug_unregister_view:
1132 debug_unregister_view(debug_info_t * id, struct debug_view *view)
1136 unsigned long flags;
1140 spin_lock_irqsave(&id->lock, flags);
1141 for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
1142 if (id->views[i] == view)
1145 if (i == DEBUG_MAX_VIEWS)
1148 debugfs_remove(id->debugfs_entries[i]);
1149 id->views[i] = NULL;
1151 spin_unlock_irqrestore(&id->lock, flags);
1156 static inline char *
1157 debug_get_user_string(const char __user *user_buf, size_t user_len)
1161 buffer = kmalloc(user_len + 1, GFP_KERNEL);
1163 return ERR_PTR(-ENOMEM);
1164 if (copy_from_user(buffer, user_buf, user_len) != 0) {
1166 return ERR_PTR(-EFAULT);
1168 /* got the string, now strip linefeed. */
1169 if (buffer[user_len - 1] == '\n')
1170 buffer[user_len - 1] = 0;
1172 buffer[user_len] = 0;
1177 debug_get_uint(char *buf)
1181 for(; isspace(*buf); buf++);
1182 rc = simple_strtoul(buf, &buf, 10);
1190 * functions for debug-views
1191 ***********************************
1195 * prints out actual debug level
1199 debug_prolog_pages_fn(debug_info_t * id,
1200 struct debug_view *view, char *out_buf)
1202 return sprintf(out_buf, "%i\n", id->pages_per_area);
1206 * reads new size (number of pages per debug area)
1210 debug_input_pages_fn(debug_info_t * id, struct debug_view *view,
1211 struct file *file, const char __user *user_buf,
1212 size_t user_len, loff_t * offset)
1217 if (user_len > 0x10000)
1223 str = debug_get_user_string(user_buf,user_len);
1228 new_pages = debug_get_uint(str);
1233 rc = debug_set_size(id,id->nr_areas, new_pages);
1242 *offset += user_len;
1243 return rc; /* number of input characters */
1247 * prints out actual debug level
1251 debug_prolog_level_fn(debug_info_t * id, struct debug_view *view, char *out_buf)
1255 if(id->level == DEBUG_OFF_LEVEL) {
1256 rc = sprintf(out_buf,"-\n");
1259 rc = sprintf(out_buf, "%i\n", id->level);
1265 * reads new debug level
1269 debug_input_level_fn(debug_info_t * id, struct debug_view *view,
1270 struct file *file, const char __user *user_buf,
1271 size_t user_len, loff_t * offset)
1276 if (user_len > 0x10000)
1282 str = debug_get_user_string(user_buf,user_len);
1288 debug_set_level(id, DEBUG_OFF_LEVEL);
1292 new_level = debug_get_uint(str);
1295 pr_warning("%s is not a valid level for a debug "
1299 debug_set_level(id, new_level);
1305 *offset += user_len;
1306 return rc; /* number of input characters */
1311 * flushes debug areas
1314 static void debug_flush(debug_info_t* id, int area)
1316 unsigned long flags;
1319 if(!id || !id->areas)
1321 spin_lock_irqsave(&id->lock,flags);
1322 if(area == DEBUG_FLUSH_ALL){
1323 id->active_area = 0;
1324 memset(id->active_entries, 0, id->nr_areas * sizeof(int));
1325 for (i = 0; i < id->nr_areas; i++) {
1326 id->active_pages[i] = 0;
1327 for(j = 0; j < id->pages_per_area; j++) {
1328 memset(id->areas[i][j], 0, PAGE_SIZE);
1331 } else if(area >= 0 && area < id->nr_areas) {
1332 id->active_entries[area] = 0;
1333 id->active_pages[area] = 0;
1334 for(i = 0; i < id->pages_per_area; i++) {
1335 memset(id->areas[area][i],0,PAGE_SIZE);
1338 spin_unlock_irqrestore(&id->lock,flags);
1342 * view function: flushes debug areas
1346 debug_input_flush_fn(debug_info_t * id, struct debug_view *view,
1347 struct file *file, const char __user *user_buf,
1348 size_t user_len, loff_t * offset)
1353 if (user_len > 0x10000)
1359 if (copy_from_user(input_buf, user_buf, 1)){
1363 if(input_buf[0] == '-') {
1364 debug_flush(id, DEBUG_FLUSH_ALL);
1367 if (isdigit(input_buf[0])) {
1368 int area = ((int) input_buf[0] - (int) '0');
1369 debug_flush(id, area);
1373 pr_info("Flushing debug data failed because %c is not a valid "
1374 "area\n", input_buf[0]);
1377 *offset += user_len;
1378 return rc; /* number of input characters */
1382 * prints debug header in raw format
1386 debug_raw_header_fn(debug_info_t * id, struct debug_view *view,
1387 int area, debug_entry_t * entry, char *out_buf)
1391 rc = sizeof(debug_entry_t);
1392 memcpy(out_buf,entry,sizeof(debug_entry_t));
1397 * prints debug data in raw format
1401 debug_raw_format_fn(debug_info_t * id, struct debug_view *view,
1402 char *out_buf, const char *in_buf)
1407 memcpy(out_buf, in_buf, id->buf_size);
1412 * prints debug data in hex/ascii format
1416 debug_hex_ascii_format_fn(debug_info_t * id, struct debug_view *view,
1417 char *out_buf, const char *in_buf)
1421 for (i = 0; i < id->buf_size; i++) {
1422 rc += sprintf(out_buf + rc, "%02x ",
1423 ((unsigned char *) in_buf)[i]);
1425 rc += sprintf(out_buf + rc, "| ");
1426 for (i = 0; i < id->buf_size; i++) {
1427 unsigned char c = in_buf[i];
1429 rc += sprintf(out_buf + rc, ".");
1431 rc += sprintf(out_buf + rc, "%c", c);
1433 rc += sprintf(out_buf + rc, "\n");
1438 * prints header for debug entry
1442 debug_dflt_header_fn(debug_info_t * id, struct debug_view *view,
1443 int area, debug_entry_t * entry, char *out_buf)
1445 struct timespec time_spec;
1447 unsigned long caller;
1451 level = entry->id.fields.level;
1452 stck_to_timespec(entry->id.stck, &time_spec);
1454 if (entry->id.fields.exception)
1458 caller = ((unsigned long) entry->caller) & PSW_ADDR_INSN;
1459 rc += sprintf(out_buf, "%02i %011lu:%06lu %1u %1s %02i %p ",
1460 area, time_spec.tv_sec, time_spec.tv_nsec / 1000, level,
1461 except_str, entry->id.fields.cpuid, (void *) caller);
1466 * prints debug data sprintf-formated:
1467 * debug_sprinf_event/exception calls must be used together with this view
1470 #define DEBUG_SPRINTF_MAX_ARGS 10
1473 debug_sprintf_format_fn(debug_info_t * id, struct debug_view *view,
1474 char *out_buf, debug_sprintf_entry_t *curr_event)
1476 int num_longs, num_used_args = 0,i, rc = 0;
1477 int index[DEBUG_SPRINTF_MAX_ARGS];
1479 /* count of longs fit into one entry */
1480 num_longs = id->buf_size / sizeof(long);
1483 goto out; /* bufsize of entry too small */
1484 if(num_longs == 1) {
1485 /* no args, we use only the string */
1486 strcpy(out_buf, curr_event->string);
1487 rc = strlen(curr_event->string);
1491 /* number of arguments used for sprintf (without the format string) */
1492 num_used_args = min(DEBUG_SPRINTF_MAX_ARGS, (num_longs - 1));
1494 memset(index,0, DEBUG_SPRINTF_MAX_ARGS * sizeof(int));
1496 for(i = 0; i < num_used_args; i++)
1499 rc = sprintf(out_buf, curr_event->string, curr_event->args[index[0]],
1500 curr_event->args[index[1]], curr_event->args[index[2]],
1501 curr_event->args[index[3]], curr_event->args[index[4]],
1502 curr_event->args[index[5]], curr_event->args[index[6]],
1503 curr_event->args[index[7]], curr_event->args[index[8]],
1504 curr_event->args[index[9]]);
1514 static void __exit debug_exit(void)
1516 debugfs_remove(debug_debugfs_root_entry);
1517 unregister_sysctl_table(s390dbf_sysctl_header);
1522 * module definitions
1524 postcore_initcall(debug_init);
1525 module_exit(debug_exit);
1526 MODULE_LICENSE("GPL");
1528 EXPORT_SYMBOL(debug_register);
1529 EXPORT_SYMBOL(debug_unregister);
1530 EXPORT_SYMBOL(debug_set_level);
1531 EXPORT_SYMBOL(debug_stop_all);
1532 EXPORT_SYMBOL(debug_register_view);
1533 EXPORT_SYMBOL(debug_unregister_view);
1534 EXPORT_SYMBOL(debug_event_common);
1535 EXPORT_SYMBOL(debug_exception_common);
1536 EXPORT_SYMBOL(debug_hex_ascii_view);
1537 EXPORT_SYMBOL(debug_raw_view);
1538 EXPORT_SYMBOL(debug_dflt_header_fn);
1539 EXPORT_SYMBOL(debug_sprintf_view);
1540 EXPORT_SYMBOL(debug_sprintf_exception);
1541 EXPORT_SYMBOL(debug_sprintf_event);