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Linux 2.6.28-rc5
[cris-mirror.git] / arch / s390 / kernel / debug.c
blobd80fcd4a7fe14210aac75d33d824fa9c6eb1c4a7
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);
CRIS linux kernel tree