Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/shaggy...
[linux-2.6] / arch / s390 / kernel / debug.c
1 /*
2  *  arch/s390/kernel/debug.c
3  *   S/390 debug facility
4  *
5  *    Copyright (C) 1999, 2000 IBM Deutschland Entwicklung GmbH,
6  *                             IBM Corporation
7  *    Author(s): Michael Holzheu (holzheu@de.ibm.com),
8  *               Holger Smolinski (Holger.Smolinski@de.ibm.com)
9  *
10  *    Bugreports to: <Linux390@de.ibm.com>
11  */
12
13 #include <linux/stddef.h>
14 #include <linux/kernel.h>
15 #include <linux/errno.h>
16 #include <linux/slab.h>
17 #include <linux/ctype.h>
18 #include <linux/sysctl.h>
19 #include <asm/uaccess.h>
20 #include <asm/semaphore.h>
21 #include <linux/module.h>
22 #include <linux/init.h>
23 #include <linux/fs.h>
24 #include <linux/debugfs.h>
25
26 #include <asm/debug.h>
27
28 #define DEBUG_PROLOG_ENTRY -1
29
30 #define ALL_AREAS 0 /* copy all debug areas */
31 #define NO_AREAS  1 /* copy no debug areas */
32
33 /* typedefs */
34
35 typedef struct file_private_info {
36         loff_t offset;                  /* offset of last read in file */
37         int    act_area;                /* number of last formated area */
38         int    act_page;                /* act page in given area */
39         int    act_entry;               /* last formated entry (offset */
40                                         /* relative to beginning of last */
41                                         /* formated page) */
42         size_t act_entry_offset;        /* up to this offset we copied */
43                                         /* in last read the last formated */
44                                         /* entry to userland */
45         char   temp_buf[2048];          /* buffer for output */
46         debug_info_t *debug_info_org;   /* original debug information */
47         debug_info_t *debug_info_snap;  /* snapshot of debug information */
48         struct debug_view *view;        /* used view of debug info */
49 } file_private_info_t;
50
51 typedef struct
52 {
53         char *string;
54         /* 
55          * This assumes that all args are converted into longs 
56          * on L/390 this is the case for all types of parameter 
57          * except of floats, and long long (32 bit) 
58          *
59          */
60         long args[0];
61 } debug_sprintf_entry_t;
62
63
64 extern void tod_to_timeval(uint64_t todval, struct timespec *xtime);
65
66 /* internal function prototyes */
67
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(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,
96                         const char *in_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);
99
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);
102
103 /* globals */
104
105 struct debug_view debug_raw_view = {
106         "raw",
107         NULL,
108         &debug_raw_header_fn,
109         &debug_raw_format_fn,
110         NULL,
111         NULL
112 };
113
114 struct debug_view debug_hex_ascii_view = {
115         "hex_ascii",
116         NULL,
117         &debug_dflt_header_fn,
118         &debug_hex_ascii_format_fn,
119         NULL,
120         NULL
121 };
122
123 static struct debug_view debug_level_view = {
124         "level",
125         &debug_prolog_level_fn,
126         NULL,
127         NULL,
128         &debug_input_level_fn,
129         NULL
130 };
131
132 static struct debug_view debug_pages_view = {
133         "pages",
134         &debug_prolog_pages_fn,
135         NULL,
136         NULL,
137         &debug_input_pages_fn,
138         NULL
139 };
140
141 static struct debug_view debug_flush_view = {
142         "flush",
143         NULL,
144         NULL,
145         NULL,
146         &debug_input_flush_fn,
147         NULL
148 };
149
150 struct debug_view debug_sprintf_view = {
151         "sprintf",
152         NULL,
153         &debug_dflt_header_fn,
154         (debug_format_proc_t*)&debug_sprintf_format_fn,
155         NULL,
156         NULL
157 };
158
159 /* used by dump analysis tools to determine version of debug feature */
160 static unsigned int __used debug_feature_version = __DEBUG_FEATURE_VERSION;
161
162 /* static globals */
163
164 static debug_info_t *debug_area_first = NULL;
165 static debug_info_t *debug_area_last = NULL;
166 static DEFINE_MUTEX(debug_mutex);
167
168 static int initialized;
169
170 static const struct file_operations debug_file_ops = {
171         .owner   = THIS_MODULE,
172         .read    = debug_output,
173         .write   = debug_input,
174         .open    = debug_open,
175         .release = debug_close,
176 };
177
178 static struct dentry *debug_debugfs_root_entry;
179
180 /* functions */
181
182 /*
183  * debug_areas_alloc
184  * - Debug areas are implemented as a threedimensonal array:
185  *   areas[areanumber][pagenumber][pageoffset]
186  */
187
188 static debug_entry_t***
189 debug_areas_alloc(int pages_per_area, int nr_areas)
190 {
191         debug_entry_t*** areas;
192         int i,j;
193
194         areas = kmalloc(nr_areas *
195                                         sizeof(debug_entry_t**),
196                                         GFP_KERNEL);
197         if (!areas)
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);
202                 if (!areas[i]) {
203                         goto fail_malloc_areas2;
204                 }
205                 for(j = 0; j < pages_per_area; j++) {
206                         areas[i][j] = kzalloc(PAGE_SIZE, GFP_KERNEL);
207                         if(!areas[i][j]) {
208                                 for(j--; j >=0 ; j--) {
209                                         kfree(areas[i][j]);
210                                 }
211                                 kfree(areas[i]);
212                                 goto fail_malloc_areas2;
213                         }
214                 }
215         }
216         return areas;
217
218 fail_malloc_areas2:
219         for(i--; i >= 0; i--){
220                 for(j=0; j < pages_per_area;j++){
221                         kfree(areas[i][j]);
222                 }
223                 kfree(areas[i]);
224         }
225         kfree(areas);
226 fail_malloc_areas:
227         return NULL;
228
229 }
230
231
232 /*
233  * debug_info_alloc
234  * - alloc new debug-info
235  */
236
237 static debug_info_t*
238 debug_info_alloc(char *name, int pages_per_area, int nr_areas, int buf_size,
239                 int level, int mode)
240 {
241         debug_info_t* rc;
242
243         /* alloc everything */
244
245         rc = kmalloc(sizeof(debug_info_t), GFP_KERNEL);
246         if(!rc)
247                 goto fail_malloc_rc;
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);
256                 if(!rc->areas)
257                         goto fail_malloc_areas;
258         } else {
259                 rc->areas = NULL;
260         }
261
262         /* initialize members */
263
264         spin_lock_init(&rc->lock);
265         rc->pages_per_area = pages_per_area;
266         rc->nr_areas       = nr_areas;
267         rc->active_area    = 0;
268         rc->level          = level;
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);
276
277         return rc;
278
279 fail_malloc_areas:
280         kfree(rc->active_pages);
281 fail_malloc_active_pages:
282         kfree(rc->active_entries);
283 fail_malloc_active_entries:
284         kfree(rc);
285 fail_malloc_rc:
286         return NULL;
287 }
288
289 /*
290  * debug_areas_free
291  * - free all debug areas
292  */
293
294 static void
295 debug_areas_free(debug_info_t* db_info)
296 {
297         int i,j;
298
299         if(!db_info->areas)
300                 return;
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]);
304                 }
305                 kfree(db_info->areas[i]);
306         }
307         kfree(db_info->areas);
308         db_info->areas = NULL;
309 }
310
311 /*
312  * debug_info_free
313  * - free memory debug-info
314  */
315
316 static void
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);
321         kfree(db_info);
322 }
323
324 /*
325  * debug_info_create
326  * - create new debug-info
327  */
328
329 static debug_info_t*
330 debug_info_create(char *name, int pages_per_area, int nr_areas, int buf_size,
331                   mode_t mode)
332 {
333         debug_info_t* rc;
334
335         rc = debug_info_alloc(name, pages_per_area, nr_areas, buf_size,
336                                 DEBUG_DEFAULT_LEVEL, ALL_AREAS);
337         if(!rc) 
338                 goto out;
339
340         rc->mode = mode & ~S_IFMT;
341
342         /* create root directory */
343         rc->debugfs_root_entry = debugfs_create_dir(rc->name,
344                                         debug_debugfs_root_entry);
345
346         /* append new element to linked list */
347         if (!debug_area_first) {
348                 /* first element in list */
349                 debug_area_first = rc;
350                 rc->prev = NULL;
351         } else {
352                 /* append element to end of list */
353                 debug_area_last->next = rc;
354                 rc->prev = debug_area_last;
355         }
356         debug_area_last = rc;
357         rc->next = NULL;
358
359         debug_info_get(rc);
360 out:
361         return rc;
362 }
363
364 /*
365  * debug_info_copy
366  * - copy debug-info
367  */
368
369 static debug_info_t*
370 debug_info_copy(debug_info_t* in, int mode)
371 {
372         int i,j;
373         debug_info_t* rc;
374         unsigned long flags;
375
376         /* get a consistent copy of the debug areas */
377         do {
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);
381                 if(!rc)
382                         goto out;
383                 /* has something changed in the meantime ? */
384                 if((rc->pages_per_area == in->pages_per_area) &&
385                    (rc->nr_areas == in->nr_areas)) {
386                         break;
387                 }
388                 spin_unlock_irqrestore(&in->lock, flags);
389                 debug_info_free(rc);
390         } while (1);
391
392         if(!rc || (mode == NO_AREAS))
393                 goto out;
394
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);
398                 }
399         }
400 out:
401         spin_unlock_irqrestore(&in->lock, flags);
402         return rc;
403 }
404
405 /*
406  * debug_info_get
407  * - increments reference count for debug-info
408  */
409
410 static void
411 debug_info_get(debug_info_t * db_info)
412 {
413         if (db_info)
414                 atomic_inc(&db_info->ref_count);
415 }
416
417 /*
418  * debug_info_put:
419  * - decreases reference count for debug-info and frees it if necessary
420  */
421
422 static void
423 debug_info_put(debug_info_t *db_info)
424 {
425         int i;
426
427         if (!db_info)
428                 return;
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])
432                                 continue;
433                         debugfs_remove(db_info->debugfs_entries[i]);
434                 }
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);
443         }
444 }
445
446 /*
447  * debug_format_entry:
448  * - format one debug entry and return size of formated data
449  */
450
451 static int
452 debug_format_entry(file_private_info_t *p_info)
453 {
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;
457         size_t len = 0;
458         if(p_info->act_entry == DEBUG_PROLOG_ENTRY){
459                 /* print prolog */
460                 if (view->prolog_proc)
461                         len += view->prolog_proc(id_snap,view,p_info->temp_buf);
462                 goto out;
463         }
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);
468                         
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));
477 out:
478         return len;
479 }
480
481 /*
482  * debug_next_entry:
483  * - goto next entry in p_info
484  */
485
486 static inline int
487 debug_next_entry(file_private_info_t *p_info)
488 {
489         debug_info_t *id;
490
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;
495                 goto out;
496         }
497         if(!id->areas)
498                 return 1;
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)){
502                 /* next page */
503                 p_info->act_entry = 0;
504                 p_info->act_page += 1;
505                 if((p_info->act_page % id->pages_per_area) == 0) {
506                         /* next area */
507                         p_info->act_area++;
508                         p_info->act_page=0;
509                 }
510                 if(p_info->act_area >= id->nr_areas)
511                         return 1;
512         }
513 out:
514         return 0;       
515 }
516
517 /*
518  * debug_output:
519  * - called for user read()
520  * - copies formated debug entries to the user buffer
521  */
522
523 static ssize_t
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 */
528 {
529         size_t count = 0;
530         size_t entry_offset;
531         file_private_info_t *p_info;
532
533         p_info = ((file_private_info_t *) file->private_data);
534         if (*offset != p_info->offset) 
535                 return -EPIPE;
536         if(p_info->act_area >= p_info->debug_info_snap->nr_areas)
537                 return 0;
538         entry_offset = p_info->act_entry_offset;
539         while(count < len){
540                 int formatted_line_size;
541                 int formatted_line_residue;
542                 int user_buf_residue;
543                 size_t copy_size;
544
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);
549                 if(copy_size){
550                         if (copy_to_user(user_buf + count, p_info->temp_buf
551                                         + entry_offset, copy_size))
552                                 return -EFAULT;
553                         count += copy_size;
554                         entry_offset += copy_size;
555                 }
556                 if(copy_size == formatted_line_residue){
557                         entry_offset = 0;
558                         if(debug_next_entry(p_info))
559                                 goto out;
560                 }
561         }
562 out:
563         p_info->offset           = *offset + count;
564         p_info->act_entry_offset = entry_offset;
565         *offset = p_info->offset;
566         return count;
567 }
568
569 /*
570  * debug_input:
571  * - called for user write()
572  * - calls input function of view
573  */
574
575 static ssize_t
576 debug_input(struct file *file, const char __user *user_buf, size_t length,
577                 loff_t *offset)
578 {
579         int rc = 0;
580         file_private_info_t *p_info;
581
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,
587                                               length, offset);
588         else
589                 rc = -EPERM;
590         mutex_unlock(&debug_mutex);
591         return rc;              /* number of input characters */
592 }
593
594 /*
595  * debug_open:
596  * - called for user open()
597  * - copies formated output to private_data area of the file
598  *   handle
599  */
600
601 static int
602 debug_open(struct inode *inode, struct file *file)
603 {
604         int i = 0, rc = 0;
605         file_private_info_t *p_info;
606         debug_info_t *debug_info, *debug_info_snapshot;
607
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])
613                         continue;
614                 else if (debug_info->debugfs_entries[i] ==
615                          file->f_path.dentry) {
616                         goto found;     /* found view ! */
617                 }
618         }
619         /* no entry found */
620         rc = -EINVAL;
621         goto out;
622
623 found:
624
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. */
628
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);
632         } else {
633                 debug_info_snapshot = debug_info_copy(debug_info, ALL_AREAS);
634         }
635
636         if(!debug_info_snapshot){
637                 rc = -ENOMEM;
638                 goto out;
639         }
640         p_info = kmalloc(sizeof(file_private_info_t),
641                                                 GFP_KERNEL);
642         if(!p_info){
643                 if(debug_info_snapshot)
644                         debug_info_free(debug_info_snapshot);
645                 rc = -ENOMEM;
646                 goto out;
647         }
648         p_info->offset = 0;
649         p_info->debug_info_snap = debug_info_snapshot;
650         p_info->debug_info_org  = debug_info;
651         p_info->view = debug_info->views[i];
652         p_info->act_area = 0;
653         p_info->act_page = 0;
654         p_info->act_entry = DEBUG_PROLOG_ENTRY;
655         p_info->act_entry_offset = 0;
656         file->private_data = p_info;
657         debug_info_get(debug_info);
658 out:
659         mutex_unlock(&debug_mutex);
660         return rc;
661 }
662
663 /*
664  * debug_close:
665  * - called for user close()
666  * - deletes  private_data area of the file handle
667  */
668
669 static int
670 debug_close(struct inode *inode, struct file *file)
671 {
672         file_private_info_t *p_info;
673         p_info = (file_private_info_t *) file->private_data;
674         if(p_info->debug_info_snap)
675                 debug_info_free(p_info->debug_info_snap);
676         debug_info_put(p_info->debug_info_org);
677         kfree(file->private_data);
678         return 0;               /* success */
679 }
680
681 /*
682  * debug_register_mode:
683  * - Creates and initializes debug area for the caller
684  *   The mode parameter allows to specify access rights for the s390dbf files
685  * - Returns handle for debug area
686  */
687
688 debug_info_t *debug_register_mode(char *name, int pages_per_area, int nr_areas,
689                                   int buf_size, mode_t mode, uid_t uid,
690                                   gid_t gid)
691 {
692         debug_info_t *rc = NULL;
693
694         /* Since debugfs currently does not support uid/gid other than root, */
695         /* we do not allow gid/uid != 0 until we get support for that. */
696         if ((uid != 0) || (gid != 0))
697                 printk(KERN_WARNING "debug: Warning - Currently only uid/gid "
698                        "= 0 are supported. Using root as owner now!");
699         if (!initialized)
700                 BUG();
701         mutex_lock(&debug_mutex);
702
703         /* create new debug_info */
704
705         rc = debug_info_create(name, pages_per_area, nr_areas, buf_size, mode);
706         if(!rc) 
707                 goto out;
708         debug_register_view(rc, &debug_level_view);
709         debug_register_view(rc, &debug_flush_view);
710         debug_register_view(rc, &debug_pages_view);
711 out:
712         if (!rc){
713                 printk(KERN_ERR "debug: debug_register failed for %s\n",name);
714         }
715         mutex_unlock(&debug_mutex);
716         return rc;
717 }
718 EXPORT_SYMBOL(debug_register_mode);
719
720 /*
721  * debug_register:
722  * - creates and initializes debug area for the caller
723  * - returns handle for debug area
724  */
725
726 debug_info_t *debug_register(char *name, int pages_per_area, int nr_areas,
727                              int buf_size)
728 {
729         return debug_register_mode(name, pages_per_area, nr_areas, buf_size,
730                                    S_IRUSR | S_IWUSR, 0, 0);
731 }
732
733 /*
734  * debug_unregister:
735  * - give back debug area
736  */
737
738 void
739 debug_unregister(debug_info_t * id)
740 {
741         if (!id)
742                 goto out;
743         mutex_lock(&debug_mutex);
744         debug_info_put(id);
745         mutex_unlock(&debug_mutex);
746
747 out:
748         return;
749 }
750
751 /*
752  * debug_set_size:
753  * - set area size (number of pages) and number of areas
754  */
755 static int
756 debug_set_size(debug_info_t* id, int nr_areas, int pages_per_area)
757 {
758         unsigned long flags;
759         debug_entry_t *** new_areas;
760         int rc=0;
761
762         if(!id || (nr_areas <= 0) || (pages_per_area < 0))
763                 return -EINVAL;
764         if(pages_per_area > 0){
765                 new_areas = debug_areas_alloc(pages_per_area, nr_areas);
766                 if(!new_areas) {
767                         printk(KERN_WARNING "debug: could not allocate memory "\
768                                          "for pagenumber: %i\n",pages_per_area);
769                         rc = -ENOMEM;
770                         goto out;
771                 }
772         } else {
773                 new_areas = NULL;
774         }
775         spin_lock_irqsave(&id->lock,flags);
776         debug_areas_free(id);
777         id->areas = new_areas;
778         id->nr_areas = nr_areas;
779         id->pages_per_area = pages_per_area;
780         id->active_area = 0;
781         memset(id->active_entries,0,sizeof(int)*id->nr_areas);
782         memset(id->active_pages, 0, sizeof(int)*id->nr_areas);
783         spin_unlock_irqrestore(&id->lock,flags);
784         printk(KERN_INFO "debug: %s: set new size (%i pages)\n"\
785                          ,id->name, pages_per_area);
786 out:
787         return rc;
788 }
789
790 /*
791  * debug_set_level:
792  * - set actual debug level
793  */
794
795 void
796 debug_set_level(debug_info_t* id, int new_level)
797 {
798         unsigned long flags;
799         if(!id)
800                 return; 
801         spin_lock_irqsave(&id->lock,flags);
802         if(new_level == DEBUG_OFF_LEVEL){
803                 id->level = DEBUG_OFF_LEVEL;
804                 printk(KERN_INFO "debug: %s: switched off\n",id->name);
805         } else if ((new_level > DEBUG_MAX_LEVEL) || (new_level < 0)) {
806                 printk(KERN_INFO
807                         "debug: %s: level %i is out of range (%i - %i)\n",
808                         id->name, new_level, 0, DEBUG_MAX_LEVEL);
809         } else {
810                 id->level = new_level;
811         }
812         spin_unlock_irqrestore(&id->lock,flags);
813 }
814
815
816 /*
817  * proceed_active_entry:
818  * - set active entry to next in the ring buffer
819  */
820
821 static inline void
822 proceed_active_entry(debug_info_t * id)
823 {
824         if ((id->active_entries[id->active_area] += id->entry_size)
825             > (PAGE_SIZE - id->entry_size)){
826                 id->active_entries[id->active_area] = 0;
827                 id->active_pages[id->active_area] =
828                         (id->active_pages[id->active_area] + 1) %
829                         id->pages_per_area;
830         }
831 }
832
833 /*
834  * proceed_active_area:
835  * - set active area to next in the ring buffer
836  */
837
838 static inline void
839 proceed_active_area(debug_info_t * id)
840 {
841         id->active_area++;
842         id->active_area = id->active_area % id->nr_areas;
843 }
844
845 /*
846  * get_active_entry:
847  */
848
849 static inline debug_entry_t*
850 get_active_entry(debug_info_t * id)
851 {
852         return (debug_entry_t *) (((char *) id->areas[id->active_area]
853                                         [id->active_pages[id->active_area]]) +
854                                         id->active_entries[id->active_area]);
855 }
856
857 /*
858  * debug_finish_entry:
859  * - set timestamp, caller address, cpu number etc.
860  */
861
862 static inline void
863 debug_finish_entry(debug_info_t * id, debug_entry_t* active, int level,
864                         int exception)
865 {
866         active->id.stck = get_clock();
867         active->id.fields.cpuid = smp_processor_id();
868         active->caller = __builtin_return_address(0);
869         active->id.fields.exception = exception;
870         active->id.fields.level     = level;
871         proceed_active_entry(id);
872         if(exception)
873                 proceed_active_area(id);
874 }
875
876 static int debug_stoppable=1;
877 static int debug_active=1;
878
879 #define CTL_S390DBF_STOPPABLE 5678
880 #define CTL_S390DBF_ACTIVE 5679
881
882 /*
883  * proc handler for the running debug_active sysctl
884  * always allow read, allow write only if debug_stoppable is set or
885  * if debug_active is already off
886  */
887 static int
888 s390dbf_procactive(ctl_table *table, int write, struct file *filp,
889                      void __user *buffer, size_t *lenp, loff_t *ppos)
890 {
891         if (!write || debug_stoppable || !debug_active)
892                 return proc_dointvec(table, write, filp, buffer, lenp, ppos);
893         else
894                 return 0;
895 }
896
897
898 static struct ctl_table s390dbf_table[] = {
899         {
900                 .ctl_name       = CTL_S390DBF_STOPPABLE,
901                 .procname       = "debug_stoppable",
902                 .data           = &debug_stoppable,
903                 .maxlen         = sizeof(int),
904                 .mode           = S_IRUGO | S_IWUSR,
905                 .proc_handler   = &proc_dointvec,
906                 .strategy       = &sysctl_intvec,
907         },
908          {
909                 .ctl_name       = CTL_S390DBF_ACTIVE,
910                 .procname       = "debug_active",
911                 .data           = &debug_active,
912                 .maxlen         = sizeof(int),
913                 .mode           = S_IRUGO | S_IWUSR,
914                 .proc_handler   = &s390dbf_procactive,
915                 .strategy       = &sysctl_intvec,
916         },
917         { .ctl_name = 0 }
918 };
919
920 static struct ctl_table s390dbf_dir_table[] = {
921         {
922                 .ctl_name       = CTL_S390DBF,
923                 .procname       = "s390dbf",
924                 .maxlen         = 0,
925                 .mode           = S_IRUGO | S_IXUGO,
926                 .child          = s390dbf_table,
927         },
928         { .ctl_name = 0 }
929 };
930
931 static struct ctl_table_header *s390dbf_sysctl_header;
932
933 void
934 debug_stop_all(void)
935 {
936         if (debug_stoppable)
937                 debug_active = 0;
938 }
939
940
941 /*
942  * debug_event_common:
943  * - write debug entry with given size
944  */
945
946 debug_entry_t*
947 debug_event_common(debug_info_t * id, int level, const void *buf, int len)
948 {
949         unsigned long flags;
950         debug_entry_t *active;
951
952         if (!debug_active || !id->areas)
953                 return NULL;
954         spin_lock_irqsave(&id->lock, flags);
955         active = get_active_entry(id);
956         memset(DEBUG_DATA(active), 0, id->buf_size);
957         memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size));
958         debug_finish_entry(id, active, level, 0);
959         spin_unlock_irqrestore(&id->lock, flags);
960
961         return active;
962 }
963
964 /*
965  * debug_exception_common:
966  * - write debug entry with given size and switch to next debug area
967  */
968
969 debug_entry_t
970 *debug_exception_common(debug_info_t * id, int level, const void *buf, int len)
971 {
972         unsigned long flags;
973         debug_entry_t *active;
974
975         if (!debug_active || !id->areas)
976                 return NULL;
977         spin_lock_irqsave(&id->lock, flags);
978         active = get_active_entry(id);
979         memset(DEBUG_DATA(active), 0, id->buf_size);
980         memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size));
981         debug_finish_entry(id, active, level, 1);
982         spin_unlock_irqrestore(&id->lock, flags);
983
984         return active;
985 }
986
987 /*
988  * counts arguments in format string for sprintf view
989  */
990
991 static inline int
992 debug_count_numargs(char *string)
993 {
994         int numargs=0;
995
996         while(*string) {
997                 if(*string++=='%')
998                         numargs++;
999         }
1000         return(numargs);
1001 }
1002
1003 /*
1004  * debug_sprintf_event:
1005  */
1006
1007 debug_entry_t*
1008 debug_sprintf_event(debug_info_t* id, int level,char *string,...)
1009 {
1010         va_list   ap;
1011         int numargs,idx;
1012         unsigned long flags;
1013         debug_sprintf_entry_t *curr_event;
1014         debug_entry_t *active;
1015
1016         if((!id) || (level > id->level))
1017                 return NULL;
1018         if (!debug_active || !id->areas)
1019                 return NULL;
1020         numargs=debug_count_numargs(string);
1021
1022         spin_lock_irqsave(&id->lock, flags);
1023         active = get_active_entry(id);
1024         curr_event=(debug_sprintf_entry_t *) DEBUG_DATA(active);
1025         va_start(ap,string);
1026         curr_event->string=string;
1027         for(idx=0;idx<min(numargs,(int)(id->buf_size / sizeof(long))-1);idx++)
1028                 curr_event->args[idx]=va_arg(ap,long);
1029         va_end(ap);
1030         debug_finish_entry(id, active, level, 0);
1031         spin_unlock_irqrestore(&id->lock, flags);
1032
1033         return active;
1034 }
1035
1036 /*
1037  * debug_sprintf_exception:
1038  */
1039
1040 debug_entry_t*
1041 debug_sprintf_exception(debug_info_t* id, int level,char *string,...)
1042 {
1043         va_list   ap;
1044         int numargs,idx;
1045         unsigned long flags;
1046         debug_sprintf_entry_t *curr_event;
1047         debug_entry_t *active;
1048
1049         if((!id) || (level > id->level))
1050                 return NULL;
1051         if (!debug_active || !id->areas)
1052                 return NULL;
1053
1054         numargs=debug_count_numargs(string);
1055
1056         spin_lock_irqsave(&id->lock, flags);
1057         active = get_active_entry(id);
1058         curr_event=(debug_sprintf_entry_t *)DEBUG_DATA(active);
1059         va_start(ap,string);
1060         curr_event->string=string;
1061         for(idx=0;idx<min(numargs,(int)(id->buf_size / sizeof(long))-1);idx++)
1062                 curr_event->args[idx]=va_arg(ap,long);
1063         va_end(ap);
1064         debug_finish_entry(id, active, level, 1);
1065         spin_unlock_irqrestore(&id->lock, flags);
1066
1067         return active;
1068 }
1069
1070 /*
1071  * debug_init:
1072  * - is called exactly once to initialize the debug feature
1073  */
1074
1075 static int
1076 __init debug_init(void)
1077 {
1078         int rc = 0;
1079
1080         s390dbf_sysctl_header = register_sysctl_table(s390dbf_dir_table);
1081         mutex_lock(&debug_mutex);
1082         debug_debugfs_root_entry = debugfs_create_dir(DEBUG_DIR_ROOT,NULL);
1083         printk(KERN_INFO "debug: Initialization complete\n");
1084         initialized = 1;
1085         mutex_unlock(&debug_mutex);
1086
1087         return rc;
1088 }
1089
1090 /*
1091  * debug_register_view:
1092  */
1093
1094 int
1095 debug_register_view(debug_info_t * id, struct debug_view *view)
1096 {
1097         int rc = 0;
1098         int i;
1099         unsigned long flags;
1100         mode_t mode;
1101         struct dentry *pde;
1102
1103         if (!id)
1104                 goto out;
1105         mode = (id->mode | S_IFREG) & ~S_IXUGO;
1106         if (!(view->prolog_proc || view->format_proc || view->header_proc))
1107                 mode &= ~(S_IRUSR | S_IRGRP | S_IROTH);
1108         if (!view->input_proc)
1109                 mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
1110         pde = debugfs_create_file(view->name, mode, id->debugfs_root_entry,
1111                                 id , &debug_file_ops);
1112         if (!pde){
1113                 printk(KERN_WARNING "debug: debugfs_create_file() failed!"\
1114                         " Cannot register view %s/%s\n", id->name,view->name);
1115                 rc = -1;
1116                 goto out;
1117         }
1118         spin_lock_irqsave(&id->lock, flags);
1119         for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
1120                 if (!id->views[i])
1121                         break;
1122         }
1123         if (i == DEBUG_MAX_VIEWS) {
1124                 printk(KERN_WARNING "debug: cannot register view %s/%s\n",
1125                         id->name,view->name);
1126                 printk(KERN_WARNING 
1127                         "debug: maximum number of views reached (%i)!\n", i);
1128                 debugfs_remove(pde);
1129                 rc = -1;
1130         } else {
1131                 id->views[i] = view;
1132                 id->debugfs_entries[i] = pde;
1133         }
1134         spin_unlock_irqrestore(&id->lock, flags);
1135 out:
1136         return rc;
1137 }
1138
1139 /*
1140  * debug_unregister_view:
1141  */
1142
1143 int
1144 debug_unregister_view(debug_info_t * id, struct debug_view *view)
1145 {
1146         int rc = 0;
1147         int i;
1148         unsigned long flags;
1149
1150         if (!id)
1151                 goto out;
1152         spin_lock_irqsave(&id->lock, flags);
1153         for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
1154                 if (id->views[i] == view)
1155                         break;
1156         }
1157         if (i == DEBUG_MAX_VIEWS)
1158                 rc = -1;
1159         else {
1160                 debugfs_remove(id->debugfs_entries[i]);
1161                 id->views[i] = NULL;
1162                 rc = 0;
1163         }
1164         spin_unlock_irqrestore(&id->lock, flags);
1165 out:
1166         return rc;
1167 }
1168
1169 static inline char *
1170 debug_get_user_string(const char __user *user_buf, size_t user_len)
1171 {
1172         char* buffer;
1173
1174         buffer = kmalloc(user_len + 1, GFP_KERNEL);
1175         if (!buffer)
1176                 return ERR_PTR(-ENOMEM);
1177         if (copy_from_user(buffer, user_buf, user_len) != 0) {
1178                 kfree(buffer);
1179                 return ERR_PTR(-EFAULT);
1180         }
1181         /* got the string, now strip linefeed. */
1182         if (buffer[user_len - 1] == '\n')
1183                 buffer[user_len - 1] = 0;
1184         else
1185                 buffer[user_len] = 0;
1186         return buffer;
1187 }
1188
1189 static inline int
1190 debug_get_uint(char *buf)
1191 {
1192         int rc;
1193
1194         for(; isspace(*buf); buf++);
1195         rc = simple_strtoul(buf, &buf, 10);
1196         if(*buf){
1197                 printk("debug: no integer specified!\n");
1198                 rc = -EINVAL;
1199         }
1200         return rc;
1201 }
1202
1203 /*
1204  * functions for debug-views
1205  ***********************************
1206 */
1207
1208 /*
1209  * prints out actual debug level
1210  */
1211
1212 static int
1213 debug_prolog_pages_fn(debug_info_t * id,
1214                                  struct debug_view *view, char *out_buf)
1215 {
1216         return sprintf(out_buf, "%i\n", id->pages_per_area);
1217 }
1218
1219 /*
1220  * reads new size (number of pages per debug area)
1221  */
1222
1223 static int
1224 debug_input_pages_fn(debug_info_t * id, struct debug_view *view,
1225                         struct file *file, const char __user *user_buf,
1226                         size_t user_len, loff_t * offset)
1227 {
1228         char *str;
1229         int rc,new_pages;
1230
1231         if (user_len > 0x10000)
1232                 user_len = 0x10000;
1233         if (*offset != 0){
1234                 rc = -EPIPE;
1235                 goto out;
1236         }
1237         str = debug_get_user_string(user_buf,user_len);
1238         if(IS_ERR(str)){
1239                 rc = PTR_ERR(str);
1240                 goto out;
1241         }
1242         new_pages = debug_get_uint(str);
1243         if(new_pages < 0){
1244                 rc = -EINVAL;
1245                 goto free_str;
1246         }
1247         rc = debug_set_size(id,id->nr_areas, new_pages);
1248         if(rc != 0){
1249                 rc = -EINVAL;
1250                 goto free_str;
1251         }
1252         rc = user_len;
1253 free_str:
1254         kfree(str);
1255 out:
1256         *offset += user_len;
1257         return rc;              /* number of input characters */
1258 }
1259
1260 /*
1261  * prints out actual debug level
1262  */
1263
1264 static int
1265 debug_prolog_level_fn(debug_info_t * id, struct debug_view *view, char *out_buf)
1266 {
1267         int rc = 0;
1268
1269         if(id->level == DEBUG_OFF_LEVEL) {
1270                 rc = sprintf(out_buf,"-\n");
1271         }
1272         else {
1273                 rc = sprintf(out_buf, "%i\n", id->level);
1274         }
1275         return rc;
1276 }
1277
1278 /*
1279  * reads new debug level
1280  */
1281
1282 static int
1283 debug_input_level_fn(debug_info_t * id, struct debug_view *view,
1284                         struct file *file, const char __user *user_buf,
1285                         size_t user_len, loff_t * offset)
1286 {
1287         char *str;
1288         int rc,new_level;
1289
1290         if (user_len > 0x10000)
1291                 user_len = 0x10000;
1292         if (*offset != 0){
1293                 rc = -EPIPE;
1294                 goto out;
1295         }
1296         str = debug_get_user_string(user_buf,user_len);
1297         if(IS_ERR(str)){
1298                 rc = PTR_ERR(str);
1299                 goto out;
1300         }
1301         if(str[0] == '-'){
1302                 debug_set_level(id, DEBUG_OFF_LEVEL);
1303                 rc = user_len;
1304                 goto free_str;
1305         } else {
1306                 new_level = debug_get_uint(str);
1307         }
1308         if(new_level < 0) {
1309                 printk(KERN_INFO "debug: level `%s` is not valid\n", str);
1310                 rc = -EINVAL;
1311         } else {
1312                 debug_set_level(id, new_level);
1313                 rc = user_len;
1314         }
1315 free_str:
1316         kfree(str);
1317 out:
1318         *offset += user_len;
1319         return rc;              /* number of input characters */
1320 }
1321
1322
1323 /*
1324  * flushes debug areas
1325  */
1326  
1327 static void debug_flush(debug_info_t* id, int area)
1328 {
1329         unsigned long flags;
1330         int i,j;
1331
1332         if(!id || !id->areas)
1333                 return;
1334         spin_lock_irqsave(&id->lock,flags);
1335         if(area == DEBUG_FLUSH_ALL){
1336                 id->active_area = 0;
1337                 memset(id->active_entries, 0, id->nr_areas * sizeof(int));
1338                 for (i = 0; i < id->nr_areas; i++) {
1339                         id->active_pages[i] = 0;
1340                         for(j = 0; j < id->pages_per_area; j++) {
1341                                 memset(id->areas[i][j], 0, PAGE_SIZE);
1342                         }
1343                 }
1344                 printk(KERN_INFO "debug: %s: all areas flushed\n",id->name);
1345         } else if(area >= 0 && area < id->nr_areas) {
1346                 id->active_entries[area] = 0;
1347                 id->active_pages[area] = 0;
1348                 for(i = 0; i < id->pages_per_area; i++) {
1349                         memset(id->areas[area][i],0,PAGE_SIZE);
1350                 }
1351                 printk(KERN_INFO "debug: %s: area %i has been flushed\n",
1352                         id->name, area);
1353         } else {
1354                 printk(KERN_INFO
1355                       "debug: %s: area %i cannot be flushed (range: %i - %i)\n",
1356                         id->name, area, 0, id->nr_areas-1);
1357         }
1358         spin_unlock_irqrestore(&id->lock,flags);
1359 }
1360
1361 /*
1362  * view function: flushes debug areas 
1363  */
1364
1365 static int
1366 debug_input_flush_fn(debug_info_t * id, struct debug_view *view,
1367                         struct file *file, const char __user *user_buf,
1368                         size_t user_len, loff_t * offset)
1369 {
1370         char input_buf[1];
1371         int rc = user_len;
1372
1373         if (user_len > 0x10000)
1374                 user_len = 0x10000;
1375         if (*offset != 0){
1376                 rc = -EPIPE;
1377                 goto out;
1378         }
1379         if (copy_from_user(input_buf, user_buf, 1)){
1380                 rc = -EFAULT;
1381                 goto out;
1382         }
1383         if(input_buf[0] == '-') { 
1384                 debug_flush(id, DEBUG_FLUSH_ALL);
1385                 goto out;
1386         }
1387         if (isdigit(input_buf[0])) {
1388                 int area = ((int) input_buf[0] - (int) '0');
1389                 debug_flush(id, area);
1390                 goto out;
1391         }
1392
1393         printk(KERN_INFO "debug: area `%c` is not valid\n", input_buf[0]);
1394
1395 out:
1396         *offset += user_len;
1397         return rc;              /* number of input characters */
1398 }
1399
1400 /*
1401  * prints debug header in raw format
1402  */
1403
1404 static int
1405 debug_raw_header_fn(debug_info_t * id, struct debug_view *view,
1406                         int area, debug_entry_t * entry, char *out_buf)
1407 {
1408         int rc;
1409
1410         rc = sizeof(debug_entry_t);
1411         memcpy(out_buf,entry,sizeof(debug_entry_t));
1412         return rc;
1413 }
1414
1415 /*
1416  * prints debug data in raw format
1417  */
1418
1419 static int
1420 debug_raw_format_fn(debug_info_t * id, struct debug_view *view,
1421                                char *out_buf, const char *in_buf)
1422 {
1423         int rc;
1424
1425         rc = id->buf_size;
1426         memcpy(out_buf, in_buf, id->buf_size);
1427         return rc;
1428 }
1429
1430 /*
1431  * prints debug data in hex/ascii format
1432  */
1433
1434 static int
1435 debug_hex_ascii_format_fn(debug_info_t * id, struct debug_view *view,
1436                           char *out_buf, const char *in_buf)
1437 {
1438         int i, rc = 0;
1439
1440         for (i = 0; i < id->buf_size; i++) {
1441                 rc += sprintf(out_buf + rc, "%02x ",
1442                               ((unsigned char *) in_buf)[i]);
1443         }
1444         rc += sprintf(out_buf + rc, "| ");
1445         for (i = 0; i < id->buf_size; i++) {
1446                 unsigned char c = in_buf[i];
1447                 if (!isprint(c))
1448                         rc += sprintf(out_buf + rc, ".");
1449                 else
1450                         rc += sprintf(out_buf + rc, "%c", c);
1451         }
1452         rc += sprintf(out_buf + rc, "\n");
1453         return rc;
1454 }
1455
1456 /*
1457  * prints header for debug entry
1458  */
1459
1460 int
1461 debug_dflt_header_fn(debug_info_t * id, struct debug_view *view,
1462                          int area, debug_entry_t * entry, char *out_buf)
1463 {
1464         struct timespec time_spec;
1465         unsigned long long time;
1466         char *except_str;
1467         unsigned long caller;
1468         int rc = 0;
1469         unsigned int level;
1470
1471         level = entry->id.fields.level;
1472         time = entry->id.stck;
1473         /* adjust todclock to 1970 */
1474         time -= 0x8126d60e46000000LL - (0x3c26700LL * 1000000 * 4096);
1475         tod_to_timeval(time, &time_spec);
1476
1477         if (entry->id.fields.exception)
1478                 except_str = "*";
1479         else
1480                 except_str = "-";
1481         caller = ((unsigned long) entry->caller) & PSW_ADDR_INSN;
1482         rc += sprintf(out_buf, "%02i %011lu:%06lu %1u %1s %02i %p  ",
1483                       area, time_spec.tv_sec, time_spec.tv_nsec / 1000, level,
1484                       except_str, entry->id.fields.cpuid, (void *) caller);
1485         return rc;
1486 }
1487
1488 /*
1489  * prints debug data sprintf-formated:
1490  * debug_sprinf_event/exception calls must be used together with this view
1491  */
1492
1493 #define DEBUG_SPRINTF_MAX_ARGS 10
1494
1495 static int
1496 debug_sprintf_format_fn(debug_info_t * id, struct debug_view *view,
1497                         char *out_buf, debug_sprintf_entry_t *curr_event)
1498 {
1499         int num_longs, num_used_args = 0,i, rc = 0;
1500         int index[DEBUG_SPRINTF_MAX_ARGS];
1501
1502         /* count of longs fit into one entry */
1503         num_longs = id->buf_size /  sizeof(long); 
1504
1505         if(num_longs < 1)
1506                 goto out; /* bufsize of entry too small */
1507         if(num_longs == 1) {
1508                 /* no args, we use only the string */
1509                 strcpy(out_buf, curr_event->string);
1510                 rc = strlen(curr_event->string);
1511                 goto out;
1512         }
1513
1514         /* number of arguments used for sprintf (without the format string) */
1515         num_used_args   = min(DEBUG_SPRINTF_MAX_ARGS, (num_longs - 1));
1516
1517         memset(index,0, DEBUG_SPRINTF_MAX_ARGS * sizeof(int));
1518
1519         for(i = 0; i < num_used_args; i++)
1520                 index[i] = i;
1521
1522         rc =  sprintf(out_buf, curr_event->string, curr_event->args[index[0]],
1523                 curr_event->args[index[1]], curr_event->args[index[2]],
1524                 curr_event->args[index[3]], curr_event->args[index[4]],
1525                 curr_event->args[index[5]], curr_event->args[index[6]],
1526                 curr_event->args[index[7]], curr_event->args[index[8]],
1527                 curr_event->args[index[9]]);
1528
1529 out:
1530
1531         return rc;
1532 }
1533
1534 /*
1535  * clean up module
1536  */
1537 static void __exit debug_exit(void)
1538 {
1539         debugfs_remove(debug_debugfs_root_entry);
1540         unregister_sysctl_table(s390dbf_sysctl_header);
1541         return;
1542 }
1543
1544 /*
1545  * module definitions
1546  */
1547 postcore_initcall(debug_init);
1548 module_exit(debug_exit);
1549 MODULE_LICENSE("GPL");
1550
1551 EXPORT_SYMBOL(debug_register);
1552 EXPORT_SYMBOL(debug_unregister); 
1553 EXPORT_SYMBOL(debug_set_level);
1554 EXPORT_SYMBOL(debug_stop_all);
1555 EXPORT_SYMBOL(debug_register_view);
1556 EXPORT_SYMBOL(debug_unregister_view);
1557 EXPORT_SYMBOL(debug_event_common);
1558 EXPORT_SYMBOL(debug_exception_common);
1559 EXPORT_SYMBOL(debug_hex_ascii_view);
1560 EXPORT_SYMBOL(debug_raw_view);
1561 EXPORT_SYMBOL(debug_dflt_header_fn);
1562 EXPORT_SYMBOL(debug_sprintf_view);
1563 EXPORT_SYMBOL(debug_sprintf_exception);
1564 EXPORT_SYMBOL(debug_sprintf_event);