[PATCH] s390: "extern inline" -> "static inline"
[linux-2.6.git] / 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/config.h>
14 #include <linux/stddef.h>
15 #include <linux/kernel.h>
16 #include <linux/errno.h>
17 #include <linux/slab.h>
18 #include <linux/ctype.h>
19 #include <linux/sysctl.h>
20 #include <asm/uaccess.h>
21 #include <asm/semaphore.h>
22 #include <linux/module.h>
23 #include <linux/init.h>
24 #include <linux/fs.h>
25 #include <linux/debugfs.h>
26
27 #include <asm/debug.h>
28
29 #define DEBUG_PROLOG_ENTRY -1
30
31 #define ALL_AREAS 0 /* copy all debug areas */
32 #define NO_AREAS  1 /* copy no debug areas */
33
34 /* typedefs */
35
36 typedef struct file_private_info {
37         loff_t offset;                  /* offset of last read in file */
38         int    act_area;                /* number of last formated area */
39         int    act_page;                /* act page in given area */
40         int    act_entry;               /* last formated entry (offset */
41                                         /* relative to beginning of last */
42                                         /* formated page) */
43         size_t act_entry_offset;        /* up to this offset we copied */
44                                         /* in last read the last formated */
45                                         /* entry to userland */
46         char   temp_buf[2048];          /* buffer for output */
47         debug_info_t *debug_info_org;   /* original debug information */
48         debug_info_t *debug_info_snap;  /* snapshot of debug information */
49         struct debug_view *view;        /* used view of debug info */
50 } file_private_info_t;
51
52 typedef struct
53 {
54         char *string;
55         /* 
56          * This assumes that all args are converted into longs 
57          * on L/390 this is the case for all types of parameter 
58          * except of floats, and long long (32 bit) 
59          *
60          */
61         long args[0];
62 } debug_sprintf_entry_t;
63
64
65 extern void tod_to_timeval(uint64_t todval, struct timespec *xtime);
66
67 /* internal function prototyes */
68
69 static int debug_init(void);
70 static ssize_t debug_output(struct file *file, char __user *user_buf,
71                         size_t user_len, loff_t * offset);
72 static ssize_t debug_input(struct file *file, const char __user *user_buf,
73                         size_t user_len, loff_t * offset);
74 static int debug_open(struct inode *inode, struct file *file);
75 static int debug_close(struct inode *inode, struct file *file);
76 static debug_info_t*  debug_info_create(char *name, int pages_per_area,
77                         int nr_areas, int buf_size);
78 static void debug_info_get(debug_info_t *);
79 static void debug_info_put(debug_info_t *);
80 static int debug_prolog_level_fn(debug_info_t * id,
81                         struct debug_view *view, char *out_buf);
82 static int debug_input_level_fn(debug_info_t * id, struct debug_view *view,
83                         struct file *file, const char __user *user_buf,
84                         size_t user_buf_size, loff_t * offset);
85 static int debug_prolog_pages_fn(debug_info_t * id,
86                         struct debug_view *view, char *out_buf);
87 static int debug_input_pages_fn(debug_info_t * id, struct debug_view *view,
88                         struct file *file, const char __user *user_buf,
89                         size_t user_buf_size, loff_t * offset);
90 static int debug_input_flush_fn(debug_info_t * id, struct debug_view *view,
91                         struct file *file, const char __user *user_buf,
92                         size_t user_buf_size, loff_t * offset);
93 static int debug_hex_ascii_format_fn(debug_info_t * id, struct debug_view *view,
94                         char *out_buf, const char *in_buf);
95 static int debug_raw_format_fn(debug_info_t * id,
96                         struct debug_view *view, char *out_buf,
97                         const char *in_buf);
98 static int debug_raw_header_fn(debug_info_t * id, struct debug_view *view,
99                         int area, debug_entry_t * entry, char *out_buf);
100
101 static int debug_sprintf_format_fn(debug_info_t * id, struct debug_view *view,
102                         char *out_buf, debug_sprintf_entry_t *curr_event);
103
104 /* globals */
105
106 struct debug_view debug_raw_view = {
107         "raw",
108         NULL,
109         &debug_raw_header_fn,
110         &debug_raw_format_fn,
111         NULL,
112         NULL
113 };
114
115 struct debug_view debug_hex_ascii_view = {
116         "hex_ascii",
117         NULL,
118         &debug_dflt_header_fn,
119         &debug_hex_ascii_format_fn,
120         NULL,
121         NULL
122 };
123
124 struct debug_view debug_level_view = {
125         "level",
126         &debug_prolog_level_fn,
127         NULL,
128         NULL,
129         &debug_input_level_fn,
130         NULL
131 };
132
133 struct debug_view debug_pages_view = {
134         "pages",
135         &debug_prolog_pages_fn,
136         NULL,
137         NULL,
138         &debug_input_pages_fn,
139         NULL
140 };
141
142 struct debug_view debug_flush_view = {
143         "flush",
144         NULL,
145         NULL,
146         NULL,
147         &debug_input_flush_fn,
148         NULL
149 };
150
151 struct debug_view debug_sprintf_view = {
152         "sprintf",
153         NULL,
154         &debug_dflt_header_fn,
155         (debug_format_proc_t*)&debug_sprintf_format_fn,
156         NULL,
157         NULL
158 };
159
160
161 unsigned int debug_feature_version = __DEBUG_FEATURE_VERSION;
162
163 /* static globals */
164
165 static debug_info_t *debug_area_first = NULL;
166 static debug_info_t *debug_area_last = NULL;
167 DECLARE_MUTEX(debug_lock);
168
169 static int initialized;
170
171 static struct file_operations debug_file_ops = {
172         .owner   = THIS_MODULE,
173         .read    = debug_output,
174         .write   = debug_input,
175         .open    = debug_open,
176         .release = debug_close,
177 };
178
179 static struct dentry *debug_debugfs_root_entry;
180
181 /* functions */
182
183 /*
184  * debug_areas_alloc
185  * - Debug areas are implemented as a threedimensonal array:
186  *   areas[areanumber][pagenumber][pageoffset]
187  */
188
189 static debug_entry_t***
190 debug_areas_alloc(int pages_per_area, int nr_areas)
191 {
192         debug_entry_t*** areas;
193         int i,j;
194
195         areas = (debug_entry_t ***) kmalloc(nr_areas *
196                                         sizeof(debug_entry_t**),
197                                         GFP_KERNEL);
198         if (!areas)
199                 goto fail_malloc_areas;
200         for (i = 0; i < nr_areas; i++) {
201                 areas[i] = (debug_entry_t**) kmalloc(pages_per_area *
202                                 sizeof(debug_entry_t*),GFP_KERNEL);
203                 if (!areas[i]) {
204                         goto fail_malloc_areas2;
205                 }
206                 for(j = 0; j < pages_per_area; j++) {
207                         areas[i][j] = (debug_entry_t*)kmalloc(PAGE_SIZE,
208                                                 GFP_KERNEL);
209                         if(!areas[i][j]) {
210                                 for(j--; j >=0 ; j--) {
211                                         kfree(areas[i][j]);
212                                 }
213                                 kfree(areas[i]);
214                                 goto fail_malloc_areas2;
215                         } else {
216                                 memset(areas[i][j],0,PAGE_SIZE);
217                         }
218                 }
219         }
220         return areas;
221
222 fail_malloc_areas2:
223         for(i--; i >= 0; i--){
224                 for(j=0; j < pages_per_area;j++){
225                         kfree(areas[i][j]);
226                 }
227                 kfree(areas[i]);
228         }
229         kfree(areas);
230 fail_malloc_areas:
231         return NULL;
232
233 }
234
235
236 /*
237  * debug_info_alloc
238  * - alloc new debug-info
239  */
240
241 static debug_info_t*
242 debug_info_alloc(char *name, int pages_per_area, int nr_areas, int buf_size,
243                 int level, int mode)
244 {
245         debug_info_t* rc;
246
247         /* alloc everything */
248
249         rc = (debug_info_t*) kmalloc(sizeof(debug_info_t), GFP_KERNEL);
250         if(!rc)
251                 goto fail_malloc_rc;
252         rc->active_entries = (int*)kmalloc(nr_areas * sizeof(int), GFP_KERNEL);
253         if(!rc->active_entries)
254                 goto fail_malloc_active_entries;
255         memset(rc->active_entries, 0, nr_areas * sizeof(int));
256         rc->active_pages = (int*)kmalloc(nr_areas * sizeof(int), GFP_KERNEL);
257         if(!rc->active_pages)
258                 goto fail_malloc_active_pages;
259         memset(rc->active_pages, 0, nr_areas * sizeof(int));
260         if((mode == ALL_AREAS) && (pages_per_area != 0)){
261                 rc->areas = debug_areas_alloc(pages_per_area, nr_areas);
262                 if(!rc->areas)
263                         goto fail_malloc_areas;
264         } else {
265                 rc->areas = NULL;
266         }
267
268         /* initialize members */
269
270         spin_lock_init(&rc->lock);
271         rc->pages_per_area = pages_per_area;
272         rc->nr_areas       = nr_areas;
273         rc->active_area    = 0;
274         rc->level          = level;
275         rc->buf_size       = buf_size;
276         rc->entry_size     = sizeof(debug_entry_t) + buf_size;
277         strlcpy(rc->name, name, sizeof(rc->name)-1);
278         memset(rc->views, 0, DEBUG_MAX_VIEWS * sizeof(struct debug_view *));
279         memset(rc->debugfs_entries, 0 ,DEBUG_MAX_VIEWS *
280                 sizeof(struct dentry*));
281         atomic_set(&(rc->ref_count), 0);
282
283         return rc;
284
285 fail_malloc_areas:
286         kfree(rc->active_pages);
287 fail_malloc_active_pages:
288         kfree(rc->active_entries);
289 fail_malloc_active_entries:
290         kfree(rc);
291 fail_malloc_rc:
292         return NULL;
293 }
294
295 /*
296  * debug_areas_free
297  * - free all debug areas
298  */
299
300 static void
301 debug_areas_free(debug_info_t* db_info)
302 {
303         int i,j;
304
305         if(!db_info->areas)
306                 return;
307         for (i = 0; i < db_info->nr_areas; i++) {
308                 for(j = 0; j < db_info->pages_per_area; j++) {
309                         kfree(db_info->areas[i][j]);
310                 }
311                 kfree(db_info->areas[i]);
312         }
313         kfree(db_info->areas);
314         db_info->areas = NULL;
315 }
316
317 /*
318  * debug_info_free
319  * - free memory debug-info
320  */
321
322 static void
323 debug_info_free(debug_info_t* db_info){
324         debug_areas_free(db_info);
325         kfree(db_info->active_entries);
326         kfree(db_info->active_pages);
327         kfree(db_info);
328 }
329
330 /*
331  * debug_info_create
332  * - create new debug-info
333  */
334
335 static debug_info_t*
336 debug_info_create(char *name, int pages_per_area, int nr_areas, int buf_size)
337 {
338         debug_info_t* rc;
339
340         rc = debug_info_alloc(name, pages_per_area, nr_areas, buf_size,
341                                 DEBUG_DEFAULT_LEVEL, ALL_AREAS);
342         if(!rc) 
343                 goto out;
344
345         /* create root directory */
346         rc->debugfs_root_entry = debugfs_create_dir(rc->name,
347                                         debug_debugfs_root_entry);
348
349         /* append new element to linked list */
350         if (!debug_area_first) {
351                 /* first element in list */
352                 debug_area_first = rc;
353                 rc->prev = NULL;
354         } else {
355                 /* append element to end of list */
356                 debug_area_last->next = rc;
357                 rc->prev = debug_area_last;
358         }
359         debug_area_last = rc;
360         rc->next = NULL;
361
362         debug_info_get(rc);
363 out:
364         return rc;
365 }
366
367 /*
368  * debug_info_copy
369  * - copy debug-info
370  */
371
372 static debug_info_t*
373 debug_info_copy(debug_info_t* in, int mode)
374 {
375         int i,j;
376         debug_info_t* rc;
377         unsigned long flags;
378
379         /* get a consistent copy of the debug areas */
380         do {
381                 rc = debug_info_alloc(in->name, in->pages_per_area,
382                         in->nr_areas, in->buf_size, in->level, mode);
383                 spin_lock_irqsave(&in->lock, flags);
384                 if(!rc)
385                         goto out;
386                 /* has something changed in the meantime ? */
387                 if((rc->pages_per_area == in->pages_per_area) &&
388                    (rc->nr_areas == in->nr_areas)) {
389                         break;
390                 }
391                 spin_unlock_irqrestore(&in->lock, flags);
392                 debug_info_free(rc);
393         } while (1);
394
395         if(!rc || (mode == NO_AREAS))
396                 goto out;
397
398         for(i = 0; i < in->nr_areas; i++){
399                 for(j = 0; j < in->pages_per_area; j++) {
400                         memcpy(rc->areas[i][j], in->areas[i][j],PAGE_SIZE);
401                 }
402         }
403 out:
404         spin_unlock_irqrestore(&in->lock, flags);
405         return rc;
406 }
407
408 /*
409  * debug_info_get
410  * - increments reference count for debug-info
411  */
412
413 static void
414 debug_info_get(debug_info_t * db_info)
415 {
416         if (db_info)
417                 atomic_inc(&db_info->ref_count);
418 }
419
420 /*
421  * debug_info_put:
422  * - decreases reference count for debug-info and frees it if necessary
423  */
424
425 static void
426 debug_info_put(debug_info_t *db_info)
427 {
428         int i;
429
430         if (!db_info)
431                 return;
432         if (atomic_dec_and_test(&db_info->ref_count)) {
433                 for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
434                         if (!db_info->views[i])
435                                 continue;
436                         debugfs_remove(db_info->debugfs_entries[i]);
437                 }
438                 debugfs_remove(db_info->debugfs_root_entry);
439                 if(db_info == debug_area_first)
440                         debug_area_first = db_info->next;
441                 if(db_info == debug_area_last)
442                         debug_area_last = db_info->prev;
443                 if(db_info->prev) db_info->prev->next = db_info->next;
444                 if(db_info->next) db_info->next->prev = db_info->prev;
445                 debug_info_free(db_info);
446         }
447 }
448
449 /*
450  * debug_format_entry:
451  * - format one debug entry and return size of formated data
452  */
453
454 static int
455 debug_format_entry(file_private_info_t *p_info)
456 {
457         debug_info_t *id_snap   = p_info->debug_info_snap;
458         struct debug_view *view = p_info->view;
459         debug_entry_t *act_entry;
460         size_t len = 0;
461         if(p_info->act_entry == DEBUG_PROLOG_ENTRY){
462                 /* print prolog */
463                 if (view->prolog_proc)
464                         len += view->prolog_proc(id_snap,view,p_info->temp_buf);
465                 goto out;
466         }
467         if (!id_snap->areas) /* this is true, if we have a prolog only view */
468                 goto out;    /* or if 'pages_per_area' is 0 */
469         act_entry = (debug_entry_t *) ((char*)id_snap->areas[p_info->act_area]
470                                 [p_info->act_page] + p_info->act_entry);
471                         
472         if (act_entry->id.stck == 0LL)
473                         goto out;  /* empty entry */
474         if (view->header_proc)
475                 len += view->header_proc(id_snap, view, p_info->act_area,
476                                         act_entry, p_info->temp_buf + len);
477         if (view->format_proc)
478                 len += view->format_proc(id_snap, view, p_info->temp_buf + len,
479                                                 DEBUG_DATA(act_entry));
480 out:
481         return len;
482 }
483
484 /*
485  * debug_next_entry:
486  * - goto next entry in p_info
487  */
488
489 static inline int
490 debug_next_entry(file_private_info_t *p_info)
491 {
492         debug_info_t *id;
493
494         id = p_info->debug_info_snap;
495         if(p_info->act_entry == DEBUG_PROLOG_ENTRY){
496                 p_info->act_entry = 0;
497                 p_info->act_page  = 0;
498                 goto out;
499         }
500         if(!id->areas)
501                 return 1;
502         p_info->act_entry += id->entry_size;
503         /* switch to next page, if we reached the end of the page  */
504         if (p_info->act_entry > (PAGE_SIZE - id->entry_size)){
505                 /* next page */
506                 p_info->act_entry = 0;
507                 p_info->act_page += 1;
508                 if((p_info->act_page % id->pages_per_area) == 0) {
509                         /* next area */
510                         p_info->act_area++;
511                         p_info->act_page=0;
512                 }
513                 if(p_info->act_area >= id->nr_areas)
514                         return 1;
515         }
516 out:
517         return 0;       
518 }
519
520 /*
521  * debug_output:
522  * - called for user read()
523  * - copies formated debug entries to the user buffer
524  */
525
526 static ssize_t
527 debug_output(struct file *file,         /* file descriptor */
528             char __user *user_buf,      /* user buffer */
529             size_t  len,                /* length of buffer */
530             loff_t *offset)             /* offset in the file */
531 {
532         size_t count = 0;
533         size_t entry_offset;
534         file_private_info_t *p_info;
535
536         p_info = ((file_private_info_t *) file->private_data);
537         if (*offset != p_info->offset) 
538                 return -EPIPE;
539         if(p_info->act_area >= p_info->debug_info_snap->nr_areas)
540                 return 0;
541         entry_offset = p_info->act_entry_offset;
542         while(count < len){
543                 int formatted_line_size;
544                 int formatted_line_residue;
545                 int user_buf_residue;
546                 size_t copy_size;
547
548                 formatted_line_size = debug_format_entry(p_info);
549                 formatted_line_residue = formatted_line_size - entry_offset;
550                 user_buf_residue = len-count;
551                 copy_size = min(user_buf_residue, formatted_line_residue);
552                 if(copy_size){
553                         if (copy_to_user(user_buf + count, p_info->temp_buf
554                                         + entry_offset, copy_size))
555                                 return -EFAULT;
556                         count += copy_size;
557                         entry_offset += copy_size;
558                 }
559                 if(copy_size == formatted_line_residue){
560                         entry_offset = 0;
561                         if(debug_next_entry(p_info))
562                                 goto out;
563                 }
564         }
565 out:
566         p_info->offset           = *offset + count;
567         p_info->act_entry_offset = entry_offset;
568         *offset = p_info->offset;
569         return count;
570 }
571
572 /*
573  * debug_input:
574  * - called for user write()
575  * - calls input function of view
576  */
577
578 static ssize_t
579 debug_input(struct file *file, const char __user *user_buf, size_t length,
580                 loff_t *offset)
581 {
582         int rc = 0;
583         file_private_info_t *p_info;
584
585         down(&debug_lock);
586         p_info = ((file_private_info_t *) file->private_data);
587         if (p_info->view->input_proc)
588                 rc = p_info->view->input_proc(p_info->debug_info_org,
589                                               p_info->view, file, user_buf,
590                                               length, offset);
591         else
592                 rc = -EPERM;
593         up(&debug_lock);
594         return rc;              /* number of input characters */
595 }
596
597 /*
598  * debug_open:
599  * - called for user open()
600  * - copies formated output to private_data area of the file
601  *   handle
602  */
603
604 static int
605 debug_open(struct inode *inode, struct file *file)
606 {
607         int i = 0, rc = 0;
608         file_private_info_t *p_info;
609         debug_info_t *debug_info, *debug_info_snapshot;
610
611         down(&debug_lock);
612         debug_info = (struct debug_info*)file->f_dentry->d_inode->u.generic_ip;
613         /* find debug view */
614         for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
615                 if (!debug_info->views[i])
616                         continue;
617                 else if (debug_info->debugfs_entries[i] ==
618                          file->f_dentry) {
619                         goto found;     /* found view ! */
620                 }
621         }
622         /* no entry found */
623         rc = -EINVAL;
624         goto out;
625
626 found:
627
628         /* Make snapshot of current debug areas to get it consistent.     */
629         /* To copy all the areas is only needed, if we have a view which  */
630         /* formats the debug areas. */
631
632         if(!debug_info->views[i]->format_proc &&
633                 !debug_info->views[i]->header_proc){
634                 debug_info_snapshot = debug_info_copy(debug_info, NO_AREAS);
635         } else {
636                 debug_info_snapshot = debug_info_copy(debug_info, ALL_AREAS);
637         }
638
639         if(!debug_info_snapshot){
640                 rc = -ENOMEM;
641                 goto out;
642         }
643         p_info = (file_private_info_t *) kmalloc(sizeof(file_private_info_t),
644                                                 GFP_KERNEL);
645         if(!p_info){
646                 if(debug_info_snapshot)
647                         debug_info_free(debug_info_snapshot);
648                 rc = -ENOMEM;
649                 goto out;
650         }
651         p_info->offset = 0;
652         p_info->debug_info_snap = debug_info_snapshot;
653         p_info->debug_info_org  = debug_info;
654         p_info->view = debug_info->views[i];
655         p_info->act_area = 0;
656         p_info->act_page = 0;
657         p_info->act_entry = DEBUG_PROLOG_ENTRY;
658         p_info->act_entry_offset = 0;
659         file->private_data = p_info;
660         debug_info_get(debug_info);
661 out:
662         up(&debug_lock);
663         return rc;
664 }
665
666 /*
667  * debug_close:
668  * - called for user close()
669  * - deletes  private_data area of the file handle
670  */
671
672 static int
673 debug_close(struct inode *inode, struct file *file)
674 {
675         file_private_info_t *p_info;
676         p_info = (file_private_info_t *) file->private_data;
677         if(p_info->debug_info_snap)
678                 debug_info_free(p_info->debug_info_snap);
679         debug_info_put(p_info->debug_info_org);
680         kfree(file->private_data);
681         return 0;               /* success */
682 }
683
684 /*
685  * debug_register:
686  * - creates and initializes debug area for the caller
687  * - returns handle for debug area
688  */
689
690 debug_info_t*
691 debug_register (char *name, int pages_per_area, int nr_areas, int buf_size)
692 {
693         debug_info_t *rc = NULL;
694
695         if (!initialized)
696                 BUG();
697         down(&debug_lock);
698
699         /* create new debug_info */
700
701         rc = debug_info_create(name, pages_per_area, nr_areas, buf_size);
702         if(!rc) 
703                 goto out;
704         debug_register_view(rc, &debug_level_view);
705         debug_register_view(rc, &debug_flush_view);
706         debug_register_view(rc, &debug_pages_view);
707 out:
708         if (!rc){
709                 printk(KERN_ERR "debug: debug_register failed for %s\n",name);
710         }
711         up(&debug_lock);
712         return rc;
713 }
714
715 /*
716  * debug_unregister:
717  * - give back debug area
718  */
719
720 void
721 debug_unregister(debug_info_t * id)
722 {
723         if (!id)
724                 goto out;
725         down(&debug_lock);
726         debug_info_put(id);
727         up(&debug_lock);
728
729 out:
730         return;
731 }
732
733 /*
734  * debug_set_size:
735  * - set area size (number of pages) and number of areas
736  */
737 static int
738 debug_set_size(debug_info_t* id, int nr_areas, int pages_per_area)
739 {
740         unsigned long flags;
741         debug_entry_t *** new_areas;
742         int rc=0;
743
744         if(!id || (nr_areas <= 0) || (pages_per_area < 0))
745                 return -EINVAL;
746         if(pages_per_area > 0){
747                 new_areas = debug_areas_alloc(pages_per_area, nr_areas);
748                 if(!new_areas) {
749                         printk(KERN_WARNING "debug: could not allocate memory "\
750                                          "for pagenumber: %i\n",pages_per_area);
751                         rc = -ENOMEM;
752                         goto out;
753                 }
754         } else {
755                 new_areas = NULL;
756         }
757         spin_lock_irqsave(&id->lock,flags);
758         debug_areas_free(id);
759         id->areas = new_areas;
760         id->nr_areas = nr_areas;
761         id->pages_per_area = pages_per_area;
762         id->active_area = 0;
763         memset(id->active_entries,0,sizeof(int)*id->nr_areas);
764         memset(id->active_pages, 0, sizeof(int)*id->nr_areas);
765         spin_unlock_irqrestore(&id->lock,flags);
766         printk(KERN_INFO "debug: %s: set new size (%i pages)\n"\
767                          ,id->name, pages_per_area);
768 out:
769         return rc;
770 }
771
772 /*
773  * debug_set_level:
774  * - set actual debug level
775  */
776
777 void
778 debug_set_level(debug_info_t* id, int new_level)
779 {
780         unsigned long flags;
781         if(!id)
782                 return; 
783         spin_lock_irqsave(&id->lock,flags);
784         if(new_level == DEBUG_OFF_LEVEL){
785                 id->level = DEBUG_OFF_LEVEL;
786                 printk(KERN_INFO "debug: %s: switched off\n",id->name);
787         } else if ((new_level > DEBUG_MAX_LEVEL) || (new_level < 0)) {
788                 printk(KERN_INFO
789                         "debug: %s: level %i is out of range (%i - %i)\n",
790                         id->name, new_level, 0, DEBUG_MAX_LEVEL);
791         } else {
792                 id->level = new_level;
793         }
794         spin_unlock_irqrestore(&id->lock,flags);
795 }
796
797
798 /*
799  * proceed_active_entry:
800  * - set active entry to next in the ring buffer
801  */
802
803 static inline void
804 proceed_active_entry(debug_info_t * id)
805 {
806         if ((id->active_entries[id->active_area] += id->entry_size)
807             > (PAGE_SIZE - id->entry_size)){
808                 id->active_entries[id->active_area] = 0;
809                 id->active_pages[id->active_area] =
810                         (id->active_pages[id->active_area] + 1) %
811                         id->pages_per_area;
812         }
813 }
814
815 /*
816  * proceed_active_area:
817  * - set active area to next in the ring buffer
818  */
819
820 static inline void
821 proceed_active_area(debug_info_t * id)
822 {
823         id->active_area++;
824         id->active_area = id->active_area % id->nr_areas;
825 }
826
827 /*
828  * get_active_entry:
829  */
830
831 static inline debug_entry_t*
832 get_active_entry(debug_info_t * id)
833 {
834         return (debug_entry_t *) (((char *) id->areas[id->active_area]
835                                         [id->active_pages[id->active_area]]) +
836                                         id->active_entries[id->active_area]);
837 }
838
839 /*
840  * debug_finish_entry:
841  * - set timestamp, caller address, cpu number etc.
842  */
843
844 static inline void
845 debug_finish_entry(debug_info_t * id, debug_entry_t* active, int level,
846                         int exception)
847 {
848         active->id.stck = get_clock();
849         active->id.fields.cpuid = smp_processor_id();
850         active->caller = __builtin_return_address(0);
851         active->id.fields.exception = exception;
852         active->id.fields.level     = level;
853         proceed_active_entry(id);
854         if(exception)
855                 proceed_active_area(id);
856 }
857
858 static int debug_stoppable=1;
859 static int debug_active=1;
860
861 #define CTL_S390DBF 5677
862 #define CTL_S390DBF_STOPPABLE 5678
863 #define CTL_S390DBF_ACTIVE 5679
864
865 /*
866  * proc handler for the running debug_active sysctl
867  * always allow read, allow write only if debug_stoppable is set or
868  * if debug_active is already off
869  */
870 static int
871 s390dbf_procactive(ctl_table *table, int write, struct file *filp,
872                      void __user *buffer, size_t *lenp, loff_t *ppos)
873 {
874         if (!write || debug_stoppable || !debug_active)
875                 return proc_dointvec(table, write, filp, buffer, lenp, ppos);
876         else
877                 return 0;
878 }
879
880
881 static struct ctl_table s390dbf_table[] = {
882         {
883                 .ctl_name       = CTL_S390DBF_STOPPABLE,
884                 .procname       = "debug_stoppable",
885                 .data           = &debug_stoppable,
886                 .maxlen         = sizeof(int),
887                 .mode           = S_IRUGO | S_IWUSR,
888                 .proc_handler   = &proc_dointvec,
889                 .strategy       = &sysctl_intvec,
890         },
891          {
892                 .ctl_name       = CTL_S390DBF_ACTIVE,
893                 .procname       = "debug_active",
894                 .data           = &debug_active,
895                 .maxlen         = sizeof(int),
896                 .mode           = S_IRUGO | S_IWUSR,
897                 .proc_handler   = &s390dbf_procactive,
898                 .strategy       = &sysctl_intvec,
899         },
900         { .ctl_name = 0 }
901 };
902
903 static struct ctl_table s390dbf_dir_table[] = {
904         {
905                 .ctl_name       = CTL_S390DBF,
906                 .procname       = "s390dbf",
907                 .maxlen         = 0,
908                 .mode           = S_IRUGO | S_IXUGO,
909                 .child          = s390dbf_table,
910         },
911         { .ctl_name = 0 }
912 };
913
914 struct ctl_table_header *s390dbf_sysctl_header;
915
916 void
917 debug_stop_all(void)
918 {
919         if (debug_stoppable)
920                 debug_active = 0;
921 }
922
923
924 /*
925  * debug_event_common:
926  * - write debug entry with given size
927  */
928
929 debug_entry_t*
930 debug_event_common(debug_info_t * id, int level, const void *buf, int len)
931 {
932         unsigned long flags;
933         debug_entry_t *active;
934
935         if (!debug_active || !id->areas)
936                 return NULL;
937         spin_lock_irqsave(&id->lock, flags);
938         active = get_active_entry(id);
939         memset(DEBUG_DATA(active), 0, id->buf_size);
940         memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size));
941         debug_finish_entry(id, active, level, 0);
942         spin_unlock_irqrestore(&id->lock, flags);
943
944         return active;
945 }
946
947 /*
948  * debug_exception_common:
949  * - write debug entry with given size and switch to next debug area
950  */
951
952 debug_entry_t
953 *debug_exception_common(debug_info_t * id, int level, const void *buf, int len)
954 {
955         unsigned long flags;
956         debug_entry_t *active;
957
958         if (!debug_active || !id->areas)
959                 return NULL;
960         spin_lock_irqsave(&id->lock, flags);
961         active = get_active_entry(id);
962         memset(DEBUG_DATA(active), 0, id->buf_size);
963         memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size));
964         debug_finish_entry(id, active, level, 1);
965         spin_unlock_irqrestore(&id->lock, flags);
966
967         return active;
968 }
969
970 /*
971  * counts arguments in format string for sprintf view
972  */
973
974 static inline int
975 debug_count_numargs(char *string)
976 {
977         int numargs=0;
978
979         while(*string) {
980                 if(*string++=='%')
981                         numargs++;
982         }
983         return(numargs);
984 }
985
986 /*
987  * debug_sprintf_event:
988  */
989
990 debug_entry_t*
991 debug_sprintf_event(debug_info_t* id, int level,char *string,...)
992 {
993         va_list   ap;
994         int numargs,idx;
995         unsigned long flags;
996         debug_sprintf_entry_t *curr_event;
997         debug_entry_t *active;
998
999         if((!id) || (level > id->level))
1000                 return NULL;
1001         if (!debug_active || !id->areas)
1002                 return NULL;
1003         numargs=debug_count_numargs(string);
1004
1005         spin_lock_irqsave(&id->lock, flags);
1006         active = get_active_entry(id);
1007         curr_event=(debug_sprintf_entry_t *) DEBUG_DATA(active);
1008         va_start(ap,string);
1009         curr_event->string=string;
1010         for(idx=0;idx<min(numargs,(int)(id->buf_size / sizeof(long))-1);idx++)
1011                 curr_event->args[idx]=va_arg(ap,long);
1012         va_end(ap);
1013         debug_finish_entry(id, active, level, 0);
1014         spin_unlock_irqrestore(&id->lock, flags);
1015
1016         return active;
1017 }
1018
1019 /*
1020  * debug_sprintf_exception:
1021  */
1022
1023 debug_entry_t*
1024 debug_sprintf_exception(debug_info_t* id, int level,char *string,...)
1025 {
1026         va_list   ap;
1027         int numargs,idx;
1028         unsigned long flags;
1029         debug_sprintf_entry_t *curr_event;
1030         debug_entry_t *active;
1031
1032         if((!id) || (level > id->level))
1033                 return NULL;
1034         if (!debug_active || !id->areas)
1035                 return NULL;
1036
1037         numargs=debug_count_numargs(string);
1038
1039         spin_lock_irqsave(&id->lock, flags);
1040         active = get_active_entry(id);
1041         curr_event=(debug_sprintf_entry_t *)DEBUG_DATA(active);
1042         va_start(ap,string);
1043         curr_event->string=string;
1044         for(idx=0;idx<min(numargs,(int)(id->buf_size / sizeof(long))-1);idx++)
1045                 curr_event->args[idx]=va_arg(ap,long);
1046         va_end(ap);
1047         debug_finish_entry(id, active, level, 1);
1048         spin_unlock_irqrestore(&id->lock, flags);
1049
1050         return active;
1051 }
1052
1053 /*
1054  * debug_init:
1055  * - is called exactly once to initialize the debug feature
1056  */
1057
1058 static int
1059 __init debug_init(void)
1060 {
1061         int rc = 0;
1062
1063         s390dbf_sysctl_header = register_sysctl_table(s390dbf_dir_table, 1);
1064         down(&debug_lock);
1065         debug_debugfs_root_entry = debugfs_create_dir(DEBUG_DIR_ROOT,NULL);
1066         printk(KERN_INFO "debug: Initialization complete\n");
1067         initialized = 1;
1068         up(&debug_lock);
1069
1070         return rc;
1071 }
1072
1073 /*
1074  * debug_register_view:
1075  */
1076
1077 int
1078 debug_register_view(debug_info_t * id, struct debug_view *view)
1079 {
1080         int rc = 0;
1081         int i;
1082         unsigned long flags;
1083         mode_t mode = S_IFREG;
1084         struct dentry *pde;
1085
1086         if (!id)
1087                 goto out;
1088         if (view->prolog_proc || view->format_proc || view->header_proc)
1089                 mode |= S_IRUSR;
1090         if (view->input_proc)
1091                 mode |= S_IWUSR;
1092         pde = debugfs_create_file(view->name, mode, id->debugfs_root_entry,
1093                                 id , &debug_file_ops);
1094         if (!pde){
1095                 printk(KERN_WARNING "debug: debugfs_create_file() failed!"\
1096                         " Cannot register view %s/%s\n", id->name,view->name);
1097                 rc = -1;
1098                 goto out;
1099         }
1100         spin_lock_irqsave(&id->lock, flags);
1101         for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
1102                 if (!id->views[i])
1103                         break;
1104         }
1105         if (i == DEBUG_MAX_VIEWS) {
1106                 printk(KERN_WARNING "debug: cannot register view %s/%s\n",
1107                         id->name,view->name);
1108                 printk(KERN_WARNING 
1109                         "debug: maximum number of views reached (%i)!\n", i);
1110                 debugfs_remove(pde);
1111                 rc = -1;
1112         } else {
1113                 id->views[i] = view;
1114                 id->debugfs_entries[i] = pde;
1115         }
1116         spin_unlock_irqrestore(&id->lock, flags);
1117 out:
1118         return rc;
1119 }
1120
1121 /*
1122  * debug_unregister_view:
1123  */
1124
1125 int
1126 debug_unregister_view(debug_info_t * id, struct debug_view *view)
1127 {
1128         int rc = 0;
1129         int i;
1130         unsigned long flags;
1131
1132         if (!id)
1133                 goto out;
1134         spin_lock_irqsave(&id->lock, flags);
1135         for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
1136                 if (id->views[i] == view)
1137                         break;
1138         }
1139         if (i == DEBUG_MAX_VIEWS)
1140                 rc = -1;
1141         else {
1142                 debugfs_remove(id->debugfs_entries[i]);
1143                 id->views[i] = NULL;
1144                 rc = 0;
1145         }
1146         spin_unlock_irqrestore(&id->lock, flags);
1147 out:
1148         return rc;
1149 }
1150
1151 static inline char *
1152 debug_get_user_string(const char __user *user_buf, size_t user_len)
1153 {
1154         char* buffer;
1155
1156         buffer = kmalloc(user_len + 1, GFP_KERNEL);
1157         if (!buffer)
1158                 return ERR_PTR(-ENOMEM);
1159         if (copy_from_user(buffer, user_buf, user_len) != 0) {
1160                 kfree(buffer);
1161                 return ERR_PTR(-EFAULT);
1162         }
1163         /* got the string, now strip linefeed. */
1164         if (buffer[user_len - 1] == '\n')
1165                 buffer[user_len - 1] = 0;
1166         else
1167                 buffer[user_len] = 0;
1168         return buffer;
1169 }
1170
1171 static inline int
1172 debug_get_uint(char *buf)
1173 {
1174         int rc;
1175
1176         for(; isspace(*buf); buf++);
1177         rc = simple_strtoul(buf, &buf, 10);
1178         if(*buf){
1179                 printk("debug: no integer specified!\n");
1180                 rc = -EINVAL;
1181         }
1182         return rc;
1183 }
1184
1185 /*
1186  * functions for debug-views
1187  ***********************************
1188 */
1189
1190 /*
1191  * prints out actual debug level
1192  */
1193
1194 static int
1195 debug_prolog_pages_fn(debug_info_t * id,
1196                                  struct debug_view *view, char *out_buf)
1197 {
1198         return sprintf(out_buf, "%i\n", id->pages_per_area);
1199 }
1200
1201 /*
1202  * reads new size (number of pages per debug area)
1203  */
1204
1205 static int
1206 debug_input_pages_fn(debug_info_t * id, struct debug_view *view,
1207                         struct file *file, const char __user *user_buf,
1208                         size_t user_len, loff_t * offset)
1209 {
1210         char *str;
1211         int rc,new_pages;
1212
1213         if (user_len > 0x10000)
1214                 user_len = 0x10000;
1215         if (*offset != 0){
1216                 rc = -EPIPE;
1217                 goto out;
1218         }
1219         str = debug_get_user_string(user_buf,user_len);
1220         if(IS_ERR(str)){
1221                 rc = PTR_ERR(str);
1222                 goto out;
1223         }
1224         new_pages = debug_get_uint(str);
1225         if(new_pages < 0){
1226                 rc = -EINVAL;
1227                 goto free_str;
1228         }
1229         rc = debug_set_size(id,id->nr_areas, new_pages);
1230         if(rc != 0){
1231                 rc = -EINVAL;
1232                 goto free_str;
1233         }
1234         rc = user_len;
1235 free_str:
1236         kfree(str);
1237 out:
1238         *offset += user_len;
1239         return rc;              /* number of input characters */
1240 }
1241
1242 /*
1243  * prints out actual debug level
1244  */
1245
1246 static int
1247 debug_prolog_level_fn(debug_info_t * id, struct debug_view *view, char *out_buf)
1248 {
1249         int rc = 0;
1250
1251         if(id->level == DEBUG_OFF_LEVEL) {
1252                 rc = sprintf(out_buf,"-\n");
1253         }
1254         else {
1255                 rc = sprintf(out_buf, "%i\n", id->level);
1256         }
1257         return rc;
1258 }
1259
1260 /*
1261  * reads new debug level
1262  */
1263
1264 static int
1265 debug_input_level_fn(debug_info_t * id, struct debug_view *view,
1266                         struct file *file, const char __user *user_buf,
1267                         size_t user_len, loff_t * offset)
1268 {
1269         char *str;
1270         int rc,new_level;
1271
1272         if (user_len > 0x10000)
1273                 user_len = 0x10000;
1274         if (*offset != 0){
1275                 rc = -EPIPE;
1276                 goto out;
1277         }
1278         str = debug_get_user_string(user_buf,user_len);
1279         if(IS_ERR(str)){
1280                 rc = PTR_ERR(str);
1281                 goto out;
1282         }
1283         if(str[0] == '-'){
1284                 debug_set_level(id, DEBUG_OFF_LEVEL);
1285                 rc = user_len;
1286                 goto free_str;
1287         } else {
1288                 new_level = debug_get_uint(str);
1289         }
1290         if(new_level < 0) {
1291                 printk(KERN_INFO "debug: level `%s` is not valid\n", str);
1292                 rc = -EINVAL;
1293         } else {
1294                 debug_set_level(id, new_level);
1295                 rc = user_len;
1296         }
1297 free_str:
1298         kfree(str);
1299 out:
1300         *offset += user_len;
1301         return rc;              /* number of input characters */
1302 }
1303
1304
1305 /*
1306  * flushes debug areas
1307  */
1308  
1309 void
1310 debug_flush(debug_info_t* id, int area)
1311 {
1312         unsigned long flags;
1313         int i,j;
1314
1315         if(!id || !id->areas)
1316                 return;
1317         spin_lock_irqsave(&id->lock,flags);
1318         if(area == DEBUG_FLUSH_ALL){
1319                 id->active_area = 0;
1320                 memset(id->active_entries, 0, id->nr_areas * sizeof(int));
1321                 for (i = 0; i < id->nr_areas; i++) {
1322                         id->active_pages[i] = 0;
1323                         for(j = 0; j < id->pages_per_area; j++) {
1324                                 memset(id->areas[i][j], 0, PAGE_SIZE);
1325                         }
1326                 }
1327                 printk(KERN_INFO "debug: %s: all areas flushed\n",id->name);
1328         } else if(area >= 0 && area < id->nr_areas) {
1329                 id->active_entries[area] = 0;
1330                 id->active_pages[area] = 0;
1331                 for(i = 0; i < id->pages_per_area; i++) {
1332                         memset(id->areas[area][i],0,PAGE_SIZE);
1333                 }
1334                 printk(KERN_INFO "debug: %s: area %i has been flushed\n",
1335                         id->name, area);
1336         } else {
1337                 printk(KERN_INFO
1338                       "debug: %s: area %i cannot be flushed (range: %i - %i)\n",
1339                         id->name, area, 0, id->nr_areas-1);
1340         }
1341         spin_unlock_irqrestore(&id->lock,flags);
1342 }
1343
1344 /*
1345  * view function: flushes debug areas 
1346  */
1347
1348 static int
1349 debug_input_flush_fn(debug_info_t * id, struct debug_view *view,
1350                         struct file *file, const char __user *user_buf,
1351                         size_t user_len, loff_t * offset)
1352 {
1353         char input_buf[1];
1354         int rc = user_len;
1355
1356         if (user_len > 0x10000)
1357                 user_len = 0x10000;
1358         if (*offset != 0){
1359                 rc = -EPIPE;
1360                 goto out;
1361         }
1362         if (copy_from_user(input_buf, user_buf, 1)){
1363                 rc = -EFAULT;
1364                 goto out;
1365         }
1366         if(input_buf[0] == '-') { 
1367                 debug_flush(id, DEBUG_FLUSH_ALL);
1368                 goto out;
1369         }
1370         if (isdigit(input_buf[0])) {
1371                 int area = ((int) input_buf[0] - (int) '0');
1372                 debug_flush(id, area);
1373                 goto out;
1374         }
1375
1376         printk(KERN_INFO "debug: area `%c` is not valid\n", input_buf[0]);
1377
1378 out:
1379         *offset += user_len;
1380         return rc;              /* number of input characters */
1381 }
1382
1383 /*
1384  * prints debug header in raw format
1385  */
1386
1387 static int
1388 debug_raw_header_fn(debug_info_t * id, struct debug_view *view,
1389                         int area, debug_entry_t * entry, char *out_buf)
1390 {
1391         int rc;
1392
1393         rc = sizeof(debug_entry_t);
1394         memcpy(out_buf,entry,sizeof(debug_entry_t));
1395         return rc;
1396 }
1397
1398 /*
1399  * prints debug data in raw format
1400  */
1401
1402 static int
1403 debug_raw_format_fn(debug_info_t * id, struct debug_view *view,
1404                                char *out_buf, const char *in_buf)
1405 {
1406         int rc;
1407
1408         rc = id->buf_size;
1409         memcpy(out_buf, in_buf, id->buf_size);
1410         return rc;
1411 }
1412
1413 /*
1414  * prints debug data in hex/ascii format
1415  */
1416
1417 static int
1418 debug_hex_ascii_format_fn(debug_info_t * id, struct debug_view *view,
1419                           char *out_buf, const char *in_buf)
1420 {
1421         int i, rc = 0;
1422
1423         for (i = 0; i < id->buf_size; i++) {
1424                 rc += sprintf(out_buf + rc, "%02x ",
1425                               ((unsigned char *) in_buf)[i]);
1426         }
1427         rc += sprintf(out_buf + rc, "| ");
1428         for (i = 0; i < id->buf_size; i++) {
1429                 unsigned char c = in_buf[i];
1430                 if (!isprint(c))
1431                         rc += sprintf(out_buf + rc, ".");
1432                 else
1433                         rc += sprintf(out_buf + rc, "%c", c);
1434         }
1435         rc += sprintf(out_buf + rc, "\n");
1436         return rc;
1437 }
1438
1439 /*
1440  * prints header for debug entry
1441  */
1442
1443 int
1444 debug_dflt_header_fn(debug_info_t * id, struct debug_view *view,
1445                          int area, debug_entry_t * entry, char *out_buf)
1446 {
1447         struct timespec time_spec;
1448         unsigned long long time;
1449         char *except_str;
1450         unsigned long caller;
1451         int rc = 0;
1452         unsigned int level;
1453
1454         level = entry->id.fields.level;
1455         time = entry->id.stck;
1456         /* adjust todclock to 1970 */
1457         time -= 0x8126d60e46000000LL - (0x3c26700LL * 1000000 * 4096);
1458         tod_to_timeval(time, &time_spec);
1459
1460         if (entry->id.fields.exception)
1461                 except_str = "*";
1462         else
1463                 except_str = "-";
1464         caller = ((unsigned long) entry->caller) & PSW_ADDR_INSN;
1465         rc += sprintf(out_buf, "%02i %011lu:%06lu %1u %1s %02i %p  ",
1466                       area, time_spec.tv_sec, time_spec.tv_nsec / 1000, level,
1467                       except_str, entry->id.fields.cpuid, (void *) caller);
1468         return rc;
1469 }
1470
1471 /*
1472  * prints debug data sprintf-formated:
1473  * debug_sprinf_event/exception calls must be used together with this view
1474  */
1475
1476 #define DEBUG_SPRINTF_MAX_ARGS 10
1477
1478 static int
1479 debug_sprintf_format_fn(debug_info_t * id, struct debug_view *view,
1480                         char *out_buf, debug_sprintf_entry_t *curr_event)
1481 {
1482         int num_longs, num_used_args = 0,i, rc = 0;
1483         int index[DEBUG_SPRINTF_MAX_ARGS];
1484
1485         /* count of longs fit into one entry */
1486         num_longs = id->buf_size /  sizeof(long); 
1487
1488         if(num_longs < 1)
1489                 goto out; /* bufsize of entry too small */
1490         if(num_longs == 1) {
1491                 /* no args, we use only the string */
1492                 strcpy(out_buf, curr_event->string);
1493                 rc = strlen(curr_event->string);
1494                 goto out;
1495         }
1496
1497         /* number of arguments used for sprintf (without the format string) */
1498         num_used_args   = min(DEBUG_SPRINTF_MAX_ARGS, (num_longs - 1));
1499
1500         memset(index,0, DEBUG_SPRINTF_MAX_ARGS * sizeof(int));
1501
1502         for(i = 0; i < num_used_args; i++)
1503                 index[i] = i;
1504
1505         rc =  sprintf(out_buf, curr_event->string, curr_event->args[index[0]],
1506                 curr_event->args[index[1]], curr_event->args[index[2]],
1507                 curr_event->args[index[3]], curr_event->args[index[4]],
1508                 curr_event->args[index[5]], curr_event->args[index[6]],
1509                 curr_event->args[index[7]], curr_event->args[index[8]],
1510                 curr_event->args[index[9]]);
1511
1512 out:
1513
1514         return rc;
1515 }
1516
1517 /*
1518  * clean up module
1519  */
1520 void
1521 __exit debug_exit(void)
1522 {
1523         debugfs_remove(debug_debugfs_root_entry);
1524         unregister_sysctl_table(s390dbf_sysctl_header);
1525         return;
1526 }
1527
1528 /*
1529  * module definitions
1530  */
1531 postcore_initcall(debug_init);
1532 module_exit(debug_exit);
1533 MODULE_LICENSE("GPL");
1534
1535 EXPORT_SYMBOL(debug_register);
1536 EXPORT_SYMBOL(debug_unregister); 
1537 EXPORT_SYMBOL(debug_set_level);
1538 EXPORT_SYMBOL(debug_stop_all);
1539 EXPORT_SYMBOL(debug_register_view);
1540 EXPORT_SYMBOL(debug_unregister_view);
1541 EXPORT_SYMBOL(debug_event_common);
1542 EXPORT_SYMBOL(debug_exception_common);
1543 EXPORT_SYMBOL(debug_hex_ascii_view);
1544 EXPORT_SYMBOL(debug_raw_view);
1545 EXPORT_SYMBOL(debug_dflt_header_fn);
1546 EXPORT_SYMBOL(debug_sprintf_view);
1547 EXPORT_SYMBOL(debug_sprintf_exception);
1548 EXPORT_SYMBOL(debug_sprintf_event);