[S390] cpu topology: dont destroy cpu sets on topology change
[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 <linux/module.h>
21 #include <linux/init.h>
22 #include <linux/fs.h>
23 #include <linux/debugfs.h>
24
25 #include <asm/debug.h>
26
27 #define DEBUG_PROLOG_ENTRY -1
28
29 #define ALL_AREAS 0 /* copy all debug areas */
30 #define NO_AREAS  1 /* copy no debug areas */
31
32 /* typedefs */
33
34 typedef struct file_private_info {
35         loff_t offset;                  /* offset of last read in file */
36         int    act_area;                /* number of last formated area */
37         int    act_page;                /* act page in given area */
38         int    act_entry;               /* last formated entry (offset */
39                                         /* relative to beginning of last */
40                                         /* formated page) */
41         size_t act_entry_offset;        /* up to this offset we copied */
42                                         /* in last read the last formated */
43                                         /* entry to userland */
44         char   temp_buf[2048];          /* buffer for output */
45         debug_info_t *debug_info_org;   /* original debug information */
46         debug_info_t *debug_info_snap;  /* snapshot of debug information */
47         struct debug_view *view;        /* used view of debug info */
48 } file_private_info_t;
49
50 typedef struct
51 {
52         char *string;
53         /* 
54          * This assumes that all args are converted into longs 
55          * on L/390 this is the case for all types of parameter 
56          * except of floats, and long long (32 bit) 
57          *
58          */
59         long args[0];
60 } debug_sprintf_entry_t;
61
62
63 extern void tod_to_timeval(uint64_t todval, struct timespec *xtime);
64
65 /* internal function prototyes */
66
67 static int debug_init(void);
68 static ssize_t debug_output(struct file *file, char __user *user_buf,
69                         size_t user_len, loff_t * offset);
70 static ssize_t debug_input(struct file *file, const char __user *user_buf,
71                         size_t user_len, loff_t * offset);
72 static int debug_open(struct inode *inode, struct file *file);
73 static int debug_close(struct inode *inode, struct file *file);
74 static debug_info_t *debug_info_create(const char *name, int pages_per_area,
75                         int nr_areas, int buf_size, mode_t mode);
76 static void debug_info_get(debug_info_t *);
77 static void debug_info_put(debug_info_t *);
78 static int debug_prolog_level_fn(debug_info_t * id,
79                         struct debug_view *view, char *out_buf);
80 static int debug_input_level_fn(debug_info_t * id, struct debug_view *view,
81                         struct file *file, const char __user *user_buf,
82                         size_t user_buf_size, loff_t * offset);
83 static int debug_prolog_pages_fn(debug_info_t * id,
84                         struct debug_view *view, char *out_buf);
85 static int debug_input_pages_fn(debug_info_t * id, struct debug_view *view,
86                         struct file *file, const char __user *user_buf,
87                         size_t user_buf_size, loff_t * offset);
88 static int debug_input_flush_fn(debug_info_t * id, struct debug_view *view,
89                         struct file *file, const char __user *user_buf,
90                         size_t user_buf_size, loff_t * offset);
91 static int debug_hex_ascii_format_fn(debug_info_t * id, struct debug_view *view,
92                         char *out_buf, const char *in_buf);
93 static int debug_raw_format_fn(debug_info_t * id,
94                         struct debug_view *view, char *out_buf,
95                         const char *in_buf);
96 static int debug_raw_header_fn(debug_info_t * id, struct debug_view *view,
97                         int area, debug_entry_t * entry, char *out_buf);
98
99 static int debug_sprintf_format_fn(debug_info_t * id, struct debug_view *view,
100                         char *out_buf, debug_sprintf_entry_t *curr_event);
101
102 /* globals */
103
104 struct debug_view debug_raw_view = {
105         "raw",
106         NULL,
107         &debug_raw_header_fn,
108         &debug_raw_format_fn,
109         NULL,
110         NULL
111 };
112
113 struct debug_view debug_hex_ascii_view = {
114         "hex_ascii",
115         NULL,
116         &debug_dflt_header_fn,
117         &debug_hex_ascii_format_fn,
118         NULL,
119         NULL
120 };
121
122 static struct debug_view debug_level_view = {
123         "level",
124         &debug_prolog_level_fn,
125         NULL,
126         NULL,
127         &debug_input_level_fn,
128         NULL
129 };
130
131 static struct debug_view debug_pages_view = {
132         "pages",
133         &debug_prolog_pages_fn,
134         NULL,
135         NULL,
136         &debug_input_pages_fn,
137         NULL
138 };
139
140 static struct debug_view debug_flush_view = {
141         "flush",
142         NULL,
143         NULL,
144         NULL,
145         &debug_input_flush_fn,
146         NULL
147 };
148
149 struct debug_view debug_sprintf_view = {
150         "sprintf",
151         NULL,
152         &debug_dflt_header_fn,
153         (debug_format_proc_t*)&debug_sprintf_format_fn,
154         NULL,
155         NULL
156 };
157
158 /* used by dump analysis tools to determine version of debug feature */
159 static unsigned int __used debug_feature_version = __DEBUG_FEATURE_VERSION;
160
161 /* static globals */
162
163 static debug_info_t *debug_area_first = NULL;
164 static debug_info_t *debug_area_last = NULL;
165 static DEFINE_MUTEX(debug_mutex);
166
167 static int initialized;
168
169 static const struct file_operations debug_file_ops = {
170         .owner   = THIS_MODULE,
171         .read    = debug_output,
172         .write   = debug_input,
173         .open    = debug_open,
174         .release = debug_close,
175 };
176
177 static struct dentry *debug_debugfs_root_entry;
178
179 /* functions */
180
181 /*
182  * debug_areas_alloc
183  * - Debug areas are implemented as a threedimensonal array:
184  *   areas[areanumber][pagenumber][pageoffset]
185  */
186
187 static debug_entry_t***
188 debug_areas_alloc(int pages_per_area, int nr_areas)
189 {
190         debug_entry_t*** areas;
191         int i,j;
192
193         areas = kmalloc(nr_areas *
194                                         sizeof(debug_entry_t**),
195                                         GFP_KERNEL);
196         if (!areas)
197                 goto fail_malloc_areas;
198         for (i = 0; i < nr_areas; i++) {
199                 areas[i] = kmalloc(pages_per_area *
200                                 sizeof(debug_entry_t*),GFP_KERNEL);
201                 if (!areas[i]) {
202                         goto fail_malloc_areas2;
203                 }
204                 for(j = 0; j < pages_per_area; j++) {
205                         areas[i][j] = kzalloc(PAGE_SIZE, GFP_KERNEL);
206                         if(!areas[i][j]) {
207                                 for(j--; j >=0 ; j--) {
208                                         kfree(areas[i][j]);
209                                 }
210                                 kfree(areas[i]);
211                                 goto fail_malloc_areas2;
212                         }
213                 }
214         }
215         return areas;
216
217 fail_malloc_areas2:
218         for(i--; i >= 0; i--){
219                 for(j=0; j < pages_per_area;j++){
220                         kfree(areas[i][j]);
221                 }
222                 kfree(areas[i]);
223         }
224         kfree(areas);
225 fail_malloc_areas:
226         return NULL;
227
228 }
229
230
231 /*
232  * debug_info_alloc
233  * - alloc new debug-info
234  */
235
236 static debug_info_t*
237 debug_info_alloc(const char *name, int pages_per_area, int nr_areas,
238                  int buf_size, int level, int mode)
239 {
240         debug_info_t* rc;
241
242         /* alloc everything */
243
244         rc = kmalloc(sizeof(debug_info_t), GFP_KERNEL);
245         if(!rc)
246                 goto fail_malloc_rc;
247         rc->active_entries = kcalloc(nr_areas, sizeof(int), GFP_KERNEL);
248         if(!rc->active_entries)
249                 goto fail_malloc_active_entries;
250         rc->active_pages = kcalloc(nr_areas, sizeof(int), GFP_KERNEL);
251         if(!rc->active_pages)
252                 goto fail_malloc_active_pages;
253         if((mode == ALL_AREAS) && (pages_per_area != 0)){
254                 rc->areas = debug_areas_alloc(pages_per_area, nr_areas);
255                 if(!rc->areas)
256                         goto fail_malloc_areas;
257         } else {
258                 rc->areas = NULL;
259         }
260
261         /* initialize members */
262
263         spin_lock_init(&rc->lock);
264         rc->pages_per_area = pages_per_area;
265         rc->nr_areas       = nr_areas;
266         rc->active_area    = 0;
267         rc->level          = level;
268         rc->buf_size       = buf_size;
269         rc->entry_size     = sizeof(debug_entry_t) + buf_size;
270         strlcpy(rc->name, name, sizeof(rc->name));
271         memset(rc->views, 0, DEBUG_MAX_VIEWS * sizeof(struct debug_view *));
272         memset(rc->debugfs_entries, 0 ,DEBUG_MAX_VIEWS *
273                 sizeof(struct dentry*));
274         atomic_set(&(rc->ref_count), 0);
275
276         return rc;
277
278 fail_malloc_areas:
279         kfree(rc->active_pages);
280 fail_malloc_active_pages:
281         kfree(rc->active_entries);
282 fail_malloc_active_entries:
283         kfree(rc);
284 fail_malloc_rc:
285         return NULL;
286 }
287
288 /*
289  * debug_areas_free
290  * - free all debug areas
291  */
292
293 static void
294 debug_areas_free(debug_info_t* db_info)
295 {
296         int i,j;
297
298         if(!db_info->areas)
299                 return;
300         for (i = 0; i < db_info->nr_areas; i++) {
301                 for(j = 0; j < db_info->pages_per_area; j++) {
302                         kfree(db_info->areas[i][j]);
303                 }
304                 kfree(db_info->areas[i]);
305         }
306         kfree(db_info->areas);
307         db_info->areas = NULL;
308 }
309
310 /*
311  * debug_info_free
312  * - free memory debug-info
313  */
314
315 static void
316 debug_info_free(debug_info_t* db_info){
317         debug_areas_free(db_info);
318         kfree(db_info->active_entries);
319         kfree(db_info->active_pages);
320         kfree(db_info);
321 }
322
323 /*
324  * debug_info_create
325  * - create new debug-info
326  */
327
328 static debug_info_t*
329 debug_info_create(const char *name, int pages_per_area, int nr_areas,
330                   int buf_size, mode_t mode)
331 {
332         debug_info_t* rc;
333
334         rc = debug_info_alloc(name, pages_per_area, nr_areas, buf_size,
335                                 DEBUG_DEFAULT_LEVEL, ALL_AREAS);
336         if(!rc) 
337                 goto out;
338
339         rc->mode = mode & ~S_IFMT;
340
341         /* create root directory */
342         rc->debugfs_root_entry = debugfs_create_dir(rc->name,
343                                         debug_debugfs_root_entry);
344
345         /* append new element to linked list */
346         if (!debug_area_first) {
347                 /* first element in list */
348                 debug_area_first = rc;
349                 rc->prev = NULL;
350         } else {
351                 /* append element to end of list */
352                 debug_area_last->next = rc;
353                 rc->prev = debug_area_last;
354         }
355         debug_area_last = rc;
356         rc->next = NULL;
357
358         debug_info_get(rc);
359 out:
360         return rc;
361 }
362
363 /*
364  * debug_info_copy
365  * - copy debug-info
366  */
367
368 static debug_info_t*
369 debug_info_copy(debug_info_t* in, int mode)
370 {
371         int i,j;
372         debug_info_t* rc;
373         unsigned long flags;
374
375         /* get a consistent copy of the debug areas */
376         do {
377                 rc = debug_info_alloc(in->name, in->pages_per_area,
378                         in->nr_areas, in->buf_size, in->level, mode);
379                 spin_lock_irqsave(&in->lock, flags);
380                 if(!rc)
381                         goto out;
382                 /* has something changed in the meantime ? */
383                 if((rc->pages_per_area == in->pages_per_area) &&
384                    (rc->nr_areas == in->nr_areas)) {
385                         break;
386                 }
387                 spin_unlock_irqrestore(&in->lock, flags);
388                 debug_info_free(rc);
389         } while (1);
390
391         if(!rc || (mode == NO_AREAS))
392                 goto out;
393
394         for(i = 0; i < in->nr_areas; i++){
395                 for(j = 0; j < in->pages_per_area; j++) {
396                         memcpy(rc->areas[i][j], in->areas[i][j],PAGE_SIZE);
397                 }
398         }
399 out:
400         spin_unlock_irqrestore(&in->lock, flags);
401         return rc;
402 }
403
404 /*
405  * debug_info_get
406  * - increments reference count for debug-info
407  */
408
409 static void
410 debug_info_get(debug_info_t * db_info)
411 {
412         if (db_info)
413                 atomic_inc(&db_info->ref_count);
414 }
415
416 /*
417  * debug_info_put:
418  * - decreases reference count for debug-info and frees it if necessary
419  */
420
421 static void
422 debug_info_put(debug_info_t *db_info)
423 {
424         int i;
425
426         if (!db_info)
427                 return;
428         if (atomic_dec_and_test(&db_info->ref_count)) {
429                 for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
430                         if (!db_info->views[i])
431                                 continue;
432                         debugfs_remove(db_info->debugfs_entries[i]);
433                 }
434                 debugfs_remove(db_info->debugfs_root_entry);
435                 if(db_info == debug_area_first)
436                         debug_area_first = db_info->next;
437                 if(db_info == debug_area_last)
438                         debug_area_last = db_info->prev;
439                 if(db_info->prev) db_info->prev->next = db_info->next;
440                 if(db_info->next) db_info->next->prev = db_info->prev;
441                 debug_info_free(db_info);
442         }
443 }
444
445 /*
446  * debug_format_entry:
447  * - format one debug entry and return size of formated data
448  */
449
450 static int
451 debug_format_entry(file_private_info_t *p_info)
452 {
453         debug_info_t *id_snap   = p_info->debug_info_snap;
454         struct debug_view *view = p_info->view;
455         debug_entry_t *act_entry;
456         size_t len = 0;
457         if(p_info->act_entry == DEBUG_PROLOG_ENTRY){
458                 /* print prolog */
459                 if (view->prolog_proc)
460                         len += view->prolog_proc(id_snap,view,p_info->temp_buf);
461                 goto out;
462         }
463         if (!id_snap->areas) /* this is true, if we have a prolog only view */
464                 goto out;    /* or if 'pages_per_area' is 0 */
465         act_entry = (debug_entry_t *) ((char*)id_snap->areas[p_info->act_area]
466                                 [p_info->act_page] + p_info->act_entry);
467                         
468         if (act_entry->id.stck == 0LL)
469                         goto out;  /* empty entry */
470         if (view->header_proc)
471                 len += view->header_proc(id_snap, view, p_info->act_area,
472                                         act_entry, p_info->temp_buf + len);
473         if (view->format_proc)
474                 len += view->format_proc(id_snap, view, p_info->temp_buf + len,
475                                                 DEBUG_DATA(act_entry));
476 out:
477         return len;
478 }
479
480 /*
481  * debug_next_entry:
482  * - goto next entry in p_info
483  */
484
485 static inline int
486 debug_next_entry(file_private_info_t *p_info)
487 {
488         debug_info_t *id;
489
490         id = p_info->debug_info_snap;
491         if(p_info->act_entry == DEBUG_PROLOG_ENTRY){
492                 p_info->act_entry = 0;
493                 p_info->act_page  = 0;
494                 goto out;
495         }
496         if(!id->areas)
497                 return 1;
498         p_info->act_entry += id->entry_size;
499         /* switch to next page, if we reached the end of the page  */
500         if (p_info->act_entry > (PAGE_SIZE - id->entry_size)){
501                 /* next page */
502                 p_info->act_entry = 0;
503                 p_info->act_page += 1;
504                 if((p_info->act_page % id->pages_per_area) == 0) {
505                         /* next area */
506                         p_info->act_area++;
507                         p_info->act_page=0;
508                 }
509                 if(p_info->act_area >= id->nr_areas)
510                         return 1;
511         }
512 out:
513         return 0;       
514 }
515
516 /*
517  * debug_output:
518  * - called for user read()
519  * - copies formated debug entries to the user buffer
520  */
521
522 static ssize_t
523 debug_output(struct file *file,         /* file descriptor */
524             char __user *user_buf,      /* user buffer */
525             size_t  len,                /* length of buffer */
526             loff_t *offset)             /* offset in the file */
527 {
528         size_t count = 0;
529         size_t entry_offset;
530         file_private_info_t *p_info;
531
532         p_info = ((file_private_info_t *) file->private_data);
533         if (*offset != p_info->offset) 
534                 return -EPIPE;
535         if(p_info->act_area >= p_info->debug_info_snap->nr_areas)
536                 return 0;
537         entry_offset = p_info->act_entry_offset;
538         while(count < len){
539                 int formatted_line_size;
540                 int formatted_line_residue;
541                 int user_buf_residue;
542                 size_t copy_size;
543
544                 formatted_line_size = debug_format_entry(p_info);
545                 formatted_line_residue = formatted_line_size - entry_offset;
546                 user_buf_residue = len-count;
547                 copy_size = min(user_buf_residue, formatted_line_residue);
548                 if(copy_size){
549                         if (copy_to_user(user_buf + count, p_info->temp_buf
550                                         + entry_offset, copy_size))
551                                 return -EFAULT;
552                         count += copy_size;
553                         entry_offset += copy_size;
554                 }
555                 if(copy_size == formatted_line_residue){
556                         entry_offset = 0;
557                         if(debug_next_entry(p_info))
558                                 goto out;
559                 }
560         }
561 out:
562         p_info->offset           = *offset + count;
563         p_info->act_entry_offset = entry_offset;
564         *offset = p_info->offset;
565         return count;
566 }
567
568 /*
569  * debug_input:
570  * - called for user write()
571  * - calls input function of view
572  */
573
574 static ssize_t
575 debug_input(struct file *file, const char __user *user_buf, size_t length,
576                 loff_t *offset)
577 {
578         int rc = 0;
579         file_private_info_t *p_info;
580
581         mutex_lock(&debug_mutex);
582         p_info = ((file_private_info_t *) file->private_data);
583         if (p_info->view->input_proc)
584                 rc = p_info->view->input_proc(p_info->debug_info_org,
585                                               p_info->view, file, user_buf,
586                                               length, offset);
587         else
588                 rc = -EPERM;
589         mutex_unlock(&debug_mutex);
590         return rc;              /* number of input characters */
591 }
592
593 /*
594  * debug_open:
595  * - called for user open()
596  * - copies formated output to private_data area of the file
597  *   handle
598  */
599
600 static int
601 debug_open(struct inode *inode, struct file *file)
602 {
603         int i = 0, rc = 0;
604         file_private_info_t *p_info;
605         debug_info_t *debug_info, *debug_info_snapshot;
606
607         mutex_lock(&debug_mutex);
608         debug_info = file->f_path.dentry->d_inode->i_private;
609         /* find debug view */
610         for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
611                 if (!debug_info->views[i])
612                         continue;
613                 else if (debug_info->debugfs_entries[i] ==
614                          file->f_path.dentry) {
615                         goto found;     /* found view ! */
616                 }
617         }
618         /* no entry found */
619         rc = -EINVAL;
620         goto out;
621
622 found:
623
624         /* Make snapshot of current debug areas to get it consistent.     */
625         /* To copy all the areas is only needed, if we have a view which  */
626         /* formats the debug areas. */
627
628         if(!debug_info->views[i]->format_proc &&
629                 !debug_info->views[i]->header_proc){
630                 debug_info_snapshot = debug_info_copy(debug_info, NO_AREAS);
631         } else {
632                 debug_info_snapshot = debug_info_copy(debug_info, ALL_AREAS);
633         }
634
635         if(!debug_info_snapshot){
636                 rc = -ENOMEM;
637                 goto out;
638         }
639         p_info = kmalloc(sizeof(file_private_info_t),
640                                                 GFP_KERNEL);
641         if(!p_info){
642                 if(debug_info_snapshot)
643                         debug_info_free(debug_info_snapshot);
644                 rc = -ENOMEM;
645                 goto out;
646         }
647         p_info->offset = 0;
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);
657 out:
658         mutex_unlock(&debug_mutex);
659         return rc;
660 }
661
662 /*
663  * debug_close:
664  * - called for user close()
665  * - deletes  private_data area of the file handle
666  */
667
668 static int
669 debug_close(struct inode *inode, struct file *file)
670 {
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 */
678 }
679
680 /*
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
685  */
686
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)
690 {
691         debug_info_t *rc = NULL;
692
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                 printk(KERN_WARNING "debug: Warning - Currently only uid/gid "
697                        "= 0 are supported. Using root as owner now!");
698         if (!initialized)
699                 BUG();
700         mutex_lock(&debug_mutex);
701
702         /* create new debug_info */
703
704         rc = debug_info_create(name, pages_per_area, nr_areas, buf_size, mode);
705         if(!rc) 
706                 goto out;
707         debug_register_view(rc, &debug_level_view);
708         debug_register_view(rc, &debug_flush_view);
709         debug_register_view(rc, &debug_pages_view);
710 out:
711         if (!rc){
712                 printk(KERN_ERR "debug: debug_register failed for %s\n",name);
713         }
714         mutex_unlock(&debug_mutex);
715         return rc;
716 }
717 EXPORT_SYMBOL(debug_register_mode);
718
719 /*
720  * debug_register:
721  * - creates and initializes debug area for the caller
722  * - returns handle for debug area
723  */
724
725 debug_info_t *debug_register(const char *name, int pages_per_area,
726                              int nr_areas, int buf_size)
727 {
728         return debug_register_mode(name, pages_per_area, nr_areas, buf_size,
729                                    S_IRUSR | S_IWUSR, 0, 0);
730 }
731
732 /*
733  * debug_unregister:
734  * - give back debug area
735  */
736
737 void
738 debug_unregister(debug_info_t * id)
739 {
740         if (!id)
741                 goto out;
742         mutex_lock(&debug_mutex);
743         debug_info_put(id);
744         mutex_unlock(&debug_mutex);
745
746 out:
747         return;
748 }
749
750 /*
751  * debug_set_size:
752  * - set area size (number of pages) and number of areas
753  */
754 static int
755 debug_set_size(debug_info_t* id, int nr_areas, int pages_per_area)
756 {
757         unsigned long flags;
758         debug_entry_t *** new_areas;
759         int rc=0;
760
761         if(!id || (nr_areas <= 0) || (pages_per_area < 0))
762                 return -EINVAL;
763         if(pages_per_area > 0){
764                 new_areas = debug_areas_alloc(pages_per_area, nr_areas);
765                 if(!new_areas) {
766                         printk(KERN_WARNING "debug: could not allocate memory "\
767                                          "for pagenumber: %i\n",pages_per_area);
768                         rc = -ENOMEM;
769                         goto out;
770                 }
771         } else {
772                 new_areas = NULL;
773         }
774         spin_lock_irqsave(&id->lock,flags);
775         debug_areas_free(id);
776         id->areas = new_areas;
777         id->nr_areas = nr_areas;
778         id->pages_per_area = pages_per_area;
779         id->active_area = 0;
780         memset(id->active_entries,0,sizeof(int)*id->nr_areas);
781         memset(id->active_pages, 0, sizeof(int)*id->nr_areas);
782         spin_unlock_irqrestore(&id->lock,flags);
783         printk(KERN_INFO "debug: %s: set new size (%i pages)\n"\
784                          ,id->name, pages_per_area);
785 out:
786         return rc;
787 }
788
789 /*
790  * debug_set_level:
791  * - set actual debug level
792  */
793
794 void
795 debug_set_level(debug_info_t* id, int new_level)
796 {
797         unsigned long flags;
798         if(!id)
799                 return; 
800         spin_lock_irqsave(&id->lock,flags);
801         if(new_level == DEBUG_OFF_LEVEL){
802                 id->level = DEBUG_OFF_LEVEL;
803                 printk(KERN_INFO "debug: %s: switched off\n",id->name);
804         } else if ((new_level > DEBUG_MAX_LEVEL) || (new_level < 0)) {
805                 printk(KERN_INFO
806                         "debug: %s: level %i is out of range (%i - %i)\n",
807                         id->name, new_level, 0, DEBUG_MAX_LEVEL);
808         } else {
809                 id->level = new_level;
810         }
811         spin_unlock_irqrestore(&id->lock,flags);
812 }
813
814
815 /*
816  * proceed_active_entry:
817  * - set active entry to next in the ring buffer
818  */
819
820 static inline void
821 proceed_active_entry(debug_info_t * id)
822 {
823         if ((id->active_entries[id->active_area] += id->entry_size)
824             > (PAGE_SIZE - id->entry_size)){
825                 id->active_entries[id->active_area] = 0;
826                 id->active_pages[id->active_area] =
827                         (id->active_pages[id->active_area] + 1) %
828                         id->pages_per_area;
829         }
830 }
831
832 /*
833  * proceed_active_area:
834  * - set active area to next in the ring buffer
835  */
836
837 static inline void
838 proceed_active_area(debug_info_t * id)
839 {
840         id->active_area++;
841         id->active_area = id->active_area % id->nr_areas;
842 }
843
844 /*
845  * get_active_entry:
846  */
847
848 static inline debug_entry_t*
849 get_active_entry(debug_info_t * id)
850 {
851         return (debug_entry_t *) (((char *) id->areas[id->active_area]
852                                         [id->active_pages[id->active_area]]) +
853                                         id->active_entries[id->active_area]);
854 }
855
856 /*
857  * debug_finish_entry:
858  * - set timestamp, caller address, cpu number etc.
859  */
860
861 static inline void
862 debug_finish_entry(debug_info_t * id, debug_entry_t* active, int level,
863                         int exception)
864 {
865         active->id.stck = get_clock();
866         active->id.fields.cpuid = smp_processor_id();
867         active->caller = __builtin_return_address(0);
868         active->id.fields.exception = exception;
869         active->id.fields.level     = level;
870         proceed_active_entry(id);
871         if(exception)
872                 proceed_active_area(id);
873 }
874
875 static int debug_stoppable=1;
876 static int debug_active=1;
877
878 #define CTL_S390DBF_STOPPABLE 5678
879 #define CTL_S390DBF_ACTIVE 5679
880
881 /*
882  * proc handler for the running debug_active sysctl
883  * always allow read, allow write only if debug_stoppable is set or
884  * if debug_active is already off
885  */
886 static int
887 s390dbf_procactive(ctl_table *table, int write, struct file *filp,
888                      void __user *buffer, size_t *lenp, loff_t *ppos)
889 {
890         if (!write || debug_stoppable || !debug_active)
891                 return proc_dointvec(table, write, filp, buffer, lenp, ppos);
892         else
893                 return 0;
894 }
895
896
897 static struct ctl_table s390dbf_table[] = {
898         {
899                 .ctl_name       = CTL_S390DBF_STOPPABLE,
900                 .procname       = "debug_stoppable",
901                 .data           = &debug_stoppable,
902                 .maxlen         = sizeof(int),
903                 .mode           = S_IRUGO | S_IWUSR,
904                 .proc_handler   = &proc_dointvec,
905                 .strategy       = &sysctl_intvec,
906         },
907          {
908                 .ctl_name       = CTL_S390DBF_ACTIVE,
909                 .procname       = "debug_active",
910                 .data           = &debug_active,
911                 .maxlen         = sizeof(int),
912                 .mode           = S_IRUGO | S_IWUSR,
913                 .proc_handler   = &s390dbf_procactive,
914                 .strategy       = &sysctl_intvec,
915         },
916         { .ctl_name = 0 }
917 };
918
919 static struct ctl_table s390dbf_dir_table[] = {
920         {
921                 .ctl_name       = CTL_S390DBF,
922                 .procname       = "s390dbf",
923                 .maxlen         = 0,
924                 .mode           = S_IRUGO | S_IXUGO,
925                 .child          = s390dbf_table,
926         },
927         { .ctl_name = 0 }
928 };
929
930 static struct ctl_table_header *s390dbf_sysctl_header;
931
932 void
933 debug_stop_all(void)
934 {
935         if (debug_stoppable)
936                 debug_active = 0;
937 }
938
939
940 /*
941  * debug_event_common:
942  * - write debug entry with given size
943  */
944
945 debug_entry_t*
946 debug_event_common(debug_info_t * id, int level, const void *buf, int len)
947 {
948         unsigned long flags;
949         debug_entry_t *active;
950
951         if (!debug_active || !id->areas)
952                 return NULL;
953         spin_lock_irqsave(&id->lock, flags);
954         active = get_active_entry(id);
955         memset(DEBUG_DATA(active), 0, id->buf_size);
956         memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size));
957         debug_finish_entry(id, active, level, 0);
958         spin_unlock_irqrestore(&id->lock, flags);
959
960         return active;
961 }
962
963 /*
964  * debug_exception_common:
965  * - write debug entry with given size and switch to next debug area
966  */
967
968 debug_entry_t
969 *debug_exception_common(debug_info_t * id, int level, const void *buf, int len)
970 {
971         unsigned long flags;
972         debug_entry_t *active;
973
974         if (!debug_active || !id->areas)
975                 return NULL;
976         spin_lock_irqsave(&id->lock, flags);
977         active = get_active_entry(id);
978         memset(DEBUG_DATA(active), 0, id->buf_size);
979         memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size));
980         debug_finish_entry(id, active, level, 1);
981         spin_unlock_irqrestore(&id->lock, flags);
982
983         return active;
984 }
985
986 /*
987  * counts arguments in format string for sprintf view
988  */
989
990 static inline int
991 debug_count_numargs(char *string)
992 {
993         int numargs=0;
994
995         while(*string) {
996                 if(*string++=='%')
997                         numargs++;
998         }
999         return(numargs);
1000 }
1001
1002 /*
1003  * debug_sprintf_event:
1004  */
1005
1006 debug_entry_t*
1007 debug_sprintf_event(debug_info_t* id, int level,char *string,...)
1008 {
1009         va_list   ap;
1010         int numargs,idx;
1011         unsigned long flags;
1012         debug_sprintf_entry_t *curr_event;
1013         debug_entry_t *active;
1014
1015         if((!id) || (level > id->level))
1016                 return NULL;
1017         if (!debug_active || !id->areas)
1018                 return NULL;
1019         numargs=debug_count_numargs(string);
1020
1021         spin_lock_irqsave(&id->lock, flags);
1022         active = get_active_entry(id);
1023         curr_event=(debug_sprintf_entry_t *) DEBUG_DATA(active);
1024         va_start(ap,string);
1025         curr_event->string=string;
1026         for(idx=0;idx<min(numargs,(int)(id->buf_size / sizeof(long))-1);idx++)
1027                 curr_event->args[idx]=va_arg(ap,long);
1028         va_end(ap);
1029         debug_finish_entry(id, active, level, 0);
1030         spin_unlock_irqrestore(&id->lock, flags);
1031
1032         return active;
1033 }
1034
1035 /*
1036  * debug_sprintf_exception:
1037  */
1038
1039 debug_entry_t*
1040 debug_sprintf_exception(debug_info_t* id, int level,char *string,...)
1041 {
1042         va_list   ap;
1043         int numargs,idx;
1044         unsigned long flags;
1045         debug_sprintf_entry_t *curr_event;
1046         debug_entry_t *active;
1047
1048         if((!id) || (level > id->level))
1049                 return NULL;
1050         if (!debug_active || !id->areas)
1051                 return NULL;
1052
1053         numargs=debug_count_numargs(string);
1054
1055         spin_lock_irqsave(&id->lock, flags);
1056         active = get_active_entry(id);
1057         curr_event=(debug_sprintf_entry_t *)DEBUG_DATA(active);
1058         va_start(ap,string);
1059         curr_event->string=string;
1060         for(idx=0;idx<min(numargs,(int)(id->buf_size / sizeof(long))-1);idx++)
1061                 curr_event->args[idx]=va_arg(ap,long);
1062         va_end(ap);
1063         debug_finish_entry(id, active, level, 1);
1064         spin_unlock_irqrestore(&id->lock, flags);
1065
1066         return active;
1067 }
1068
1069 /*
1070  * debug_init:
1071  * - is called exactly once to initialize the debug feature
1072  */
1073
1074 static int
1075 __init debug_init(void)
1076 {
1077         int rc = 0;
1078
1079         s390dbf_sysctl_header = register_sysctl_table(s390dbf_dir_table);
1080         mutex_lock(&debug_mutex);
1081         debug_debugfs_root_entry = debugfs_create_dir(DEBUG_DIR_ROOT,NULL);
1082         initialized = 1;
1083         mutex_unlock(&debug_mutex);
1084
1085         return rc;
1086 }
1087
1088 /*
1089  * debug_register_view:
1090  */
1091
1092 int
1093 debug_register_view(debug_info_t * id, struct debug_view *view)
1094 {
1095         int rc = 0;
1096         int i;
1097         unsigned long flags;
1098         mode_t mode;
1099         struct dentry *pde;
1100
1101         if (!id)
1102                 goto out;
1103         mode = (id->mode | S_IFREG) & ~S_IXUGO;
1104         if (!(view->prolog_proc || view->format_proc || view->header_proc))
1105                 mode &= ~(S_IRUSR | S_IRGRP | S_IROTH);
1106         if (!view->input_proc)
1107                 mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
1108         pde = debugfs_create_file(view->name, mode, id->debugfs_root_entry,
1109                                 id , &debug_file_ops);
1110         if (!pde){
1111                 printk(KERN_WARNING "debug: debugfs_create_file() failed!"\
1112                         " Cannot register view %s/%s\n", id->name,view->name);
1113                 rc = -1;
1114                 goto out;
1115         }
1116         spin_lock_irqsave(&id->lock, flags);
1117         for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
1118                 if (!id->views[i])
1119                         break;
1120         }
1121         if (i == DEBUG_MAX_VIEWS) {
1122                 printk(KERN_WARNING "debug: cannot register view %s/%s\n",
1123                         id->name,view->name);
1124                 printk(KERN_WARNING 
1125                         "debug: maximum number of views reached (%i)!\n", i);
1126                 debugfs_remove(pde);
1127                 rc = -1;
1128         } else {
1129                 id->views[i] = view;
1130                 id->debugfs_entries[i] = pde;
1131         }
1132         spin_unlock_irqrestore(&id->lock, flags);
1133 out:
1134         return rc;
1135 }
1136
1137 /*
1138  * debug_unregister_view:
1139  */
1140
1141 int
1142 debug_unregister_view(debug_info_t * id, struct debug_view *view)
1143 {
1144         int rc = 0;
1145         int i;
1146         unsigned long flags;
1147
1148         if (!id)
1149                 goto out;
1150         spin_lock_irqsave(&id->lock, flags);
1151         for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
1152                 if (id->views[i] == view)
1153                         break;
1154         }
1155         if (i == DEBUG_MAX_VIEWS)
1156                 rc = -1;
1157         else {
1158                 debugfs_remove(id->debugfs_entries[i]);
1159                 id->views[i] = NULL;
1160                 rc = 0;
1161         }
1162         spin_unlock_irqrestore(&id->lock, flags);
1163 out:
1164         return rc;
1165 }
1166
1167 static inline char *
1168 debug_get_user_string(const char __user *user_buf, size_t user_len)
1169 {
1170         char* buffer;
1171
1172         buffer = kmalloc(user_len + 1, GFP_KERNEL);
1173         if (!buffer)
1174                 return ERR_PTR(-ENOMEM);
1175         if (copy_from_user(buffer, user_buf, user_len) != 0) {
1176                 kfree(buffer);
1177                 return ERR_PTR(-EFAULT);
1178         }
1179         /* got the string, now strip linefeed. */
1180         if (buffer[user_len - 1] == '\n')
1181                 buffer[user_len - 1] = 0;
1182         else
1183                 buffer[user_len] = 0;
1184         return buffer;
1185 }
1186
1187 static inline int
1188 debug_get_uint(char *buf)
1189 {
1190         int rc;
1191
1192         for(; isspace(*buf); buf++);
1193         rc = simple_strtoul(buf, &buf, 10);
1194         if(*buf){
1195                 rc = -EINVAL;
1196         }
1197         return rc;
1198 }
1199
1200 /*
1201  * functions for debug-views
1202  ***********************************
1203 */
1204
1205 /*
1206  * prints out actual debug level
1207  */
1208
1209 static int
1210 debug_prolog_pages_fn(debug_info_t * id,
1211                                  struct debug_view *view, char *out_buf)
1212 {
1213         return sprintf(out_buf, "%i\n", id->pages_per_area);
1214 }
1215
1216 /*
1217  * reads new size (number of pages per debug area)
1218  */
1219
1220 static int
1221 debug_input_pages_fn(debug_info_t * id, struct debug_view *view,
1222                         struct file *file, const char __user *user_buf,
1223                         size_t user_len, loff_t * offset)
1224 {
1225         char *str;
1226         int rc,new_pages;
1227
1228         if (user_len > 0x10000)
1229                 user_len = 0x10000;
1230         if (*offset != 0){
1231                 rc = -EPIPE;
1232                 goto out;
1233         }
1234         str = debug_get_user_string(user_buf,user_len);
1235         if(IS_ERR(str)){
1236                 rc = PTR_ERR(str);
1237                 goto out;
1238         }
1239         new_pages = debug_get_uint(str);
1240         if(new_pages < 0){
1241                 rc = -EINVAL;
1242                 goto free_str;
1243         }
1244         rc = debug_set_size(id,id->nr_areas, new_pages);
1245         if(rc != 0){
1246                 rc = -EINVAL;
1247                 goto free_str;
1248         }
1249         rc = user_len;
1250 free_str:
1251         kfree(str);
1252 out:
1253         *offset += user_len;
1254         return rc;              /* number of input characters */
1255 }
1256
1257 /*
1258  * prints out actual debug level
1259  */
1260
1261 static int
1262 debug_prolog_level_fn(debug_info_t * id, struct debug_view *view, char *out_buf)
1263 {
1264         int rc = 0;
1265
1266         if(id->level == DEBUG_OFF_LEVEL) {
1267                 rc = sprintf(out_buf,"-\n");
1268         }
1269         else {
1270                 rc = sprintf(out_buf, "%i\n", id->level);
1271         }
1272         return rc;
1273 }
1274
1275 /*
1276  * reads new debug level
1277  */
1278
1279 static int
1280 debug_input_level_fn(debug_info_t * id, struct debug_view *view,
1281                         struct file *file, const char __user *user_buf,
1282                         size_t user_len, loff_t * offset)
1283 {
1284         char *str;
1285         int rc,new_level;
1286
1287         if (user_len > 0x10000)
1288                 user_len = 0x10000;
1289         if (*offset != 0){
1290                 rc = -EPIPE;
1291                 goto out;
1292         }
1293         str = debug_get_user_string(user_buf,user_len);
1294         if(IS_ERR(str)){
1295                 rc = PTR_ERR(str);
1296                 goto out;
1297         }
1298         if(str[0] == '-'){
1299                 debug_set_level(id, DEBUG_OFF_LEVEL);
1300                 rc = user_len;
1301                 goto free_str;
1302         } else {
1303                 new_level = debug_get_uint(str);
1304         }
1305         if(new_level < 0) {
1306                 printk(KERN_INFO "debug: level `%s` is not valid\n", str);
1307                 rc = -EINVAL;
1308         } else {
1309                 debug_set_level(id, new_level);
1310                 rc = user_len;
1311         }
1312 free_str:
1313         kfree(str);
1314 out:
1315         *offset += user_len;
1316         return rc;              /* number of input characters */
1317 }
1318
1319
1320 /*
1321  * flushes debug areas
1322  */
1323  
1324 static void debug_flush(debug_info_t* id, int area)
1325 {
1326         unsigned long flags;
1327         int i,j;
1328
1329         if(!id || !id->areas)
1330                 return;
1331         spin_lock_irqsave(&id->lock,flags);
1332         if(area == DEBUG_FLUSH_ALL){
1333                 id->active_area = 0;
1334                 memset(id->active_entries, 0, id->nr_areas * sizeof(int));
1335                 for (i = 0; i < id->nr_areas; i++) {
1336                         id->active_pages[i] = 0;
1337                         for(j = 0; j < id->pages_per_area; j++) {
1338                                 memset(id->areas[i][j], 0, PAGE_SIZE);
1339                         }
1340                 }
1341         } else if(area >= 0 && area < id->nr_areas) {
1342                 id->active_entries[area] = 0;
1343                 id->active_pages[area] = 0;
1344                 for(i = 0; i < id->pages_per_area; i++) {
1345                         memset(id->areas[area][i],0,PAGE_SIZE);
1346                 }
1347         }
1348         spin_unlock_irqrestore(&id->lock,flags);
1349 }
1350
1351 /*
1352  * view function: flushes debug areas 
1353  */
1354
1355 static int
1356 debug_input_flush_fn(debug_info_t * id, struct debug_view *view,
1357                         struct file *file, const char __user *user_buf,
1358                         size_t user_len, loff_t * offset)
1359 {
1360         char input_buf[1];
1361         int rc = user_len;
1362
1363         if (user_len > 0x10000)
1364                 user_len = 0x10000;
1365         if (*offset != 0){
1366                 rc = -EPIPE;
1367                 goto out;
1368         }
1369         if (copy_from_user(input_buf, user_buf, 1)){
1370                 rc = -EFAULT;
1371                 goto out;
1372         }
1373         if(input_buf[0] == '-') { 
1374                 debug_flush(id, DEBUG_FLUSH_ALL);
1375                 goto out;
1376         }
1377         if (isdigit(input_buf[0])) {
1378                 int area = ((int) input_buf[0] - (int) '0');
1379                 debug_flush(id, area);
1380                 goto out;
1381         }
1382
1383         printk(KERN_INFO "debug: area `%c` is not valid\n", input_buf[0]);
1384
1385 out:
1386         *offset += user_len;
1387         return rc;              /* number of input characters */
1388 }
1389
1390 /*
1391  * prints debug header in raw format
1392  */
1393
1394 static int
1395 debug_raw_header_fn(debug_info_t * id, struct debug_view *view,
1396                         int area, debug_entry_t * entry, char *out_buf)
1397 {
1398         int rc;
1399
1400         rc = sizeof(debug_entry_t);
1401         memcpy(out_buf,entry,sizeof(debug_entry_t));
1402         return rc;
1403 }
1404
1405 /*
1406  * prints debug data in raw format
1407  */
1408
1409 static int
1410 debug_raw_format_fn(debug_info_t * id, struct debug_view *view,
1411                                char *out_buf, const char *in_buf)
1412 {
1413         int rc;
1414
1415         rc = id->buf_size;
1416         memcpy(out_buf, in_buf, id->buf_size);
1417         return rc;
1418 }
1419
1420 /*
1421  * prints debug data in hex/ascii format
1422  */
1423
1424 static int
1425 debug_hex_ascii_format_fn(debug_info_t * id, struct debug_view *view,
1426                           char *out_buf, const char *in_buf)
1427 {
1428         int i, rc = 0;
1429
1430         for (i = 0; i < id->buf_size; i++) {
1431                 rc += sprintf(out_buf + rc, "%02x ",
1432                               ((unsigned char *) in_buf)[i]);
1433         }
1434         rc += sprintf(out_buf + rc, "| ");
1435         for (i = 0; i < id->buf_size; i++) {
1436                 unsigned char c = in_buf[i];
1437                 if (!isprint(c))
1438                         rc += sprintf(out_buf + rc, ".");
1439                 else
1440                         rc += sprintf(out_buf + rc, "%c", c);
1441         }
1442         rc += sprintf(out_buf + rc, "\n");
1443         return rc;
1444 }
1445
1446 /*
1447  * prints header for debug entry
1448  */
1449
1450 int
1451 debug_dflt_header_fn(debug_info_t * id, struct debug_view *view,
1452                          int area, debug_entry_t * entry, char *out_buf)
1453 {
1454         struct timespec time_spec;
1455         unsigned long long time;
1456         char *except_str;
1457         unsigned long caller;
1458         int rc = 0;
1459         unsigned int level;
1460
1461         level = entry->id.fields.level;
1462         time = entry->id.stck;
1463         /* adjust todclock to 1970 */
1464         time -= 0x8126d60e46000000LL - (0x3c26700LL * 1000000 * 4096);
1465         tod_to_timeval(time, &time_spec);
1466
1467         if (entry->id.fields.exception)
1468                 except_str = "*";
1469         else
1470                 except_str = "-";
1471         caller = ((unsigned long) entry->caller) & PSW_ADDR_INSN;
1472         rc += sprintf(out_buf, "%02i %011lu:%06lu %1u %1s %02i %p  ",
1473                       area, time_spec.tv_sec, time_spec.tv_nsec / 1000, level,
1474                       except_str, entry->id.fields.cpuid, (void *) caller);
1475         return rc;
1476 }
1477
1478 /*
1479  * prints debug data sprintf-formated:
1480  * debug_sprinf_event/exception calls must be used together with this view
1481  */
1482
1483 #define DEBUG_SPRINTF_MAX_ARGS 10
1484
1485 static int
1486 debug_sprintf_format_fn(debug_info_t * id, struct debug_view *view,
1487                         char *out_buf, debug_sprintf_entry_t *curr_event)
1488 {
1489         int num_longs, num_used_args = 0,i, rc = 0;
1490         int index[DEBUG_SPRINTF_MAX_ARGS];
1491
1492         /* count of longs fit into one entry */
1493         num_longs = id->buf_size /  sizeof(long); 
1494
1495         if(num_longs < 1)
1496                 goto out; /* bufsize of entry too small */
1497         if(num_longs == 1) {
1498                 /* no args, we use only the string */
1499                 strcpy(out_buf, curr_event->string);
1500                 rc = strlen(curr_event->string);
1501                 goto out;
1502         }
1503
1504         /* number of arguments used for sprintf (without the format string) */
1505         num_used_args   = min(DEBUG_SPRINTF_MAX_ARGS, (num_longs - 1));
1506
1507         memset(index,0, DEBUG_SPRINTF_MAX_ARGS * sizeof(int));
1508
1509         for(i = 0; i < num_used_args; i++)
1510                 index[i] = i;
1511
1512         rc =  sprintf(out_buf, curr_event->string, curr_event->args[index[0]],
1513                 curr_event->args[index[1]], curr_event->args[index[2]],
1514                 curr_event->args[index[3]], curr_event->args[index[4]],
1515                 curr_event->args[index[5]], curr_event->args[index[6]],
1516                 curr_event->args[index[7]], curr_event->args[index[8]],
1517                 curr_event->args[index[9]]);
1518
1519 out:
1520
1521         return rc;
1522 }
1523
1524 /*
1525  * clean up module
1526  */
1527 static void __exit debug_exit(void)
1528 {
1529         debugfs_remove(debug_debugfs_root_entry);
1530         unregister_sysctl_table(s390dbf_sysctl_header);
1531         return;
1532 }
1533
1534 /*
1535  * module definitions
1536  */
1537 postcore_initcall(debug_init);
1538 module_exit(debug_exit);
1539 MODULE_LICENSE("GPL");
1540
1541 EXPORT_SYMBOL(debug_register);
1542 EXPORT_SYMBOL(debug_unregister); 
1543 EXPORT_SYMBOL(debug_set_level);
1544 EXPORT_SYMBOL(debug_stop_all);
1545 EXPORT_SYMBOL(debug_register_view);
1546 EXPORT_SYMBOL(debug_unregister_view);
1547 EXPORT_SYMBOL(debug_event_common);
1548 EXPORT_SYMBOL(debug_exception_common);
1549 EXPORT_SYMBOL(debug_hex_ascii_view);
1550 EXPORT_SYMBOL(debug_raw_view);
1551 EXPORT_SYMBOL(debug_dflt_header_fn);
1552 EXPORT_SYMBOL(debug_sprintf_view);
1553 EXPORT_SYMBOL(debug_sprintf_exception);
1554 EXPORT_SYMBOL(debug_sprintf_event);