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[TG3]: Set minimal hw interrupt mitigation.
[linux-2.6/verdex.git] / arch / s390 / kernel / debug.c
blob91f8ce5543d3b405287056b562e4d754b987476e
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
23 #include <linux/module.h>
24 #include <linux/init.h>
25
26 #include <asm/debug.h>
27
28 #define DEBUG_PROLOG_ENTRY -1
29
30 /* typedefs */
31
32 typedef struct file_private_info {
33 loff_t offset; /* offset of last read in file */
34 int act_area; /* number of last formated area */
35 int act_entry; /* last formated entry (offset */
36 /* relative to beginning of last */
37 /* formated area) */
38 size_t act_entry_offset; /* up to this offset we copied */
39 /* in last read the last formated */
40 /* entry to userland */
41 char temp_buf[2048]; /* buffer for output */
42 debug_info_t *debug_info_org; /* original debug information */
43 debug_info_t *debug_info_snap; /* snapshot of debug information */
44 struct debug_view *view; /* used view of debug info */
45 } file_private_info_t;
46
47 typedef struct
48 {
49 char *string;
50 /*
51 * This assumes that all args are converted into longs
52 * on L/390 this is the case for all types of parameter
53 * except of floats, and long long (32 bit)
54 *
55 */
56 long args[0];
57 } debug_sprintf_entry_t;
58
59
60 extern void tod_to_timeval(uint64_t todval, struct timeval *xtime);
61
62 /* internal function prototyes */
63
64 static int debug_init(void);
65 static ssize_t debug_output(struct file *file, char __user *user_buf,
66 size_t user_len, loff_t * offset);
67 static ssize_t debug_input(struct file *file, const char __user *user_buf,
68 size_t user_len, loff_t * offset);
69 static int debug_open(struct inode *inode, struct file *file);
70 static int debug_close(struct inode *inode, struct file *file);
71 static debug_info_t* debug_info_create(char *name, int page_order, int nr_areas, int buf_size);
72 static void debug_info_get(debug_info_t *);
73 static void debug_info_put(debug_info_t *);
74 static int debug_prolog_level_fn(debug_info_t * id,
75 struct debug_view *view, char *out_buf);
76 static int debug_input_level_fn(debug_info_t * id, struct debug_view *view,
77 struct file *file, const char __user *user_buf,
78 size_t user_buf_size, loff_t * offset);
79 static int debug_input_flush_fn(debug_info_t * id, struct debug_view *view,
80 struct file *file, const char __user *user_buf,
81 size_t user_buf_size, loff_t * offset);
82 static int debug_hex_ascii_format_fn(debug_info_t * id, struct debug_view *view,
83 char *out_buf, const char *in_buf);
84 static int debug_raw_format_fn(debug_info_t * id,
85 struct debug_view *view, char *out_buf,
86 const char *in_buf);
87 static int debug_raw_header_fn(debug_info_t * id, struct debug_view *view,
88 int area, debug_entry_t * entry, char *out_buf);
89
90 static int debug_sprintf_format_fn(debug_info_t * id, struct debug_view *view,
91 char *out_buf, debug_sprintf_entry_t *curr_event);
92
93 /* globals */
94
95 struct debug_view debug_raw_view = {
96 "raw",
97 NULL,
98 &debug_raw_header_fn,
99 &debug_raw_format_fn,
100 NULL,
101 NULL
102 };
103
104 struct debug_view debug_hex_ascii_view = {
105 "hex_ascii",
106 NULL,
107 &debug_dflt_header_fn,
108 &debug_hex_ascii_format_fn,
109 NULL,
110 NULL
111 };
112
113 struct debug_view debug_level_view = {
114 "level",
115 &debug_prolog_level_fn,
116 NULL,
117 NULL,
118 &debug_input_level_fn,
119 NULL
120 };
121
122 struct debug_view debug_flush_view = {
123 "flush",
124 NULL,
125 NULL,
126 NULL,
127 &debug_input_flush_fn,
128 NULL
129 };
130
131 struct debug_view debug_sprintf_view = {
132 "sprintf",
133 NULL,
134 &debug_dflt_header_fn,
135 (debug_format_proc_t*)&debug_sprintf_format_fn,
136 NULL,
137 NULL
138 };
139
140
141 unsigned int debug_feature_version = __DEBUG_FEATURE_VERSION;
142
143 /* static globals */
144
145 static debug_info_t *debug_area_first = NULL;
146 static debug_info_t *debug_area_last = NULL;
147 DECLARE_MUTEX(debug_lock);
148
149 static int initialized;
150
151 static struct file_operations debug_file_ops = {
152 .owner = THIS_MODULE,
153 .read = debug_output,
154 .write = debug_input,
155 .open = debug_open,
156 .release = debug_close,
157 };
158
159 static struct proc_dir_entry *debug_proc_root_entry;
160
161 /* functions */
162
163 /*
164 * debug_info_alloc
165 * - alloc new debug-info
166 */
167
168 static debug_info_t* debug_info_alloc(char *name, int page_order,
169 int nr_areas, int buf_size)
170 {
171 debug_info_t* rc;
172 int i;
173
174 /* alloc everything */
175
176 rc = (debug_info_t*) kmalloc(sizeof(debug_info_t), GFP_ATOMIC);
177 if(!rc)
178 goto fail_malloc_rc;
179 rc->active_entry = (int*)kmalloc(nr_areas * sizeof(int), GFP_ATOMIC);
180 if(!rc->active_entry)
181 goto fail_malloc_active_entry;
182 memset(rc->active_entry, 0, nr_areas * sizeof(int));
183 rc->areas = (debug_entry_t **) kmalloc(nr_areas *
184 sizeof(debug_entry_t *),
185 GFP_ATOMIC);
186 if (!rc->areas)
187 goto fail_malloc_areas;
188 for (i = 0; i < nr_areas; i++) {
189 rc->areas[i] = (debug_entry_t *) __get_free_pages(GFP_ATOMIC,
190 page_order);
191 if (!rc->areas[i]) {
192 for (i--; i >= 0; i--) {
193 free_pages((unsigned long) rc->areas[i],
194 page_order);
195 }
196 goto fail_malloc_areas2;
197 } else {
198 memset(rc->areas[i], 0, PAGE_SIZE << page_order);
199 }
200 }
201
202 /* initialize members */
203
204 spin_lock_init(&rc->lock);
205 rc->page_order = page_order;
206 rc->nr_areas = nr_areas;
207 rc->active_area = 0;
208 rc->level = DEBUG_DEFAULT_LEVEL;
209 rc->buf_size = buf_size;
210 rc->entry_size = sizeof(debug_entry_t) + buf_size;
211 strlcpy(rc->name, name, sizeof(rc->name));
212 memset(rc->views, 0, DEBUG_MAX_VIEWS * sizeof(struct debug_view *));
213 #ifdef CONFIG_PROC_FS
214 memset(rc->proc_entries, 0 ,DEBUG_MAX_VIEWS *
215 sizeof(struct proc_dir_entry*));
216 #endif /* CONFIG_PROC_FS */
217 atomic_set(&(rc->ref_count), 0);
218
219 return rc;
220
221 fail_malloc_areas2:
222 kfree(rc->areas);
223 fail_malloc_areas:
224 kfree(rc->active_entry);
225 fail_malloc_active_entry:
226 kfree(rc);
227 fail_malloc_rc:
228 return NULL;
229 }
230
231 /*
232 * debug_info_free
233 * - free memory debug-info
234 */
235
236 static void debug_info_free(debug_info_t* db_info){
237 int i;
238 for (i = 0; i < db_info->nr_areas; i++) {
239 free_pages((unsigned long) db_info->areas[i],
240 db_info->page_order);
241 }
242 kfree(db_info->areas);
243 kfree(db_info->active_entry);
244 kfree(db_info);
245 }
246
247 /*
248 * debug_info_create
249 * - create new debug-info
250 */
251
252 static debug_info_t* debug_info_create(char *name, int page_order,
253 int nr_areas, int buf_size)
254 {
255 debug_info_t* rc;
256
257 rc = debug_info_alloc(name, page_order, nr_areas, buf_size);
258 if(!rc)
259 goto out;
260
261
262 /* create proc rood directory */
263 rc->proc_root_entry = proc_mkdir(rc->name, debug_proc_root_entry);
264
265 /* append new element to linked list */
266 if (debug_area_first == NULL) {
267 /* first element in list */
268 debug_area_first = rc;
269 rc->prev = NULL;
270 } else {
271 /* append element to end of list */
272 debug_area_last->next = rc;
273 rc->prev = debug_area_last;
274 }
275 debug_area_last = rc;
276 rc->next = NULL;
277
278 debug_info_get(rc);
279 out:
280 return rc;
281 }
282
283 /*
284 * debug_info_copy
285 * - copy debug-info
286 */
287
288 static debug_info_t* debug_info_copy(debug_info_t* in)
289 {
290 int i;
291 debug_info_t* rc;
292 rc = debug_info_alloc(in->name, in->page_order,
293 in->nr_areas, in->buf_size);
294 if(!rc)
295 goto out;
296
297 for(i = 0; i < in->nr_areas; i++){
298 memcpy(rc->areas[i],in->areas[i], PAGE_SIZE << in->page_order);
299 }
300 out:
301 return rc;
302 }
303
304 /*
305 * debug_info_get
306 * - increments reference count for debug-info
307 */
308
309 static void debug_info_get(debug_info_t * db_info)
310 {
311 if (db_info)
312 atomic_inc(&db_info->ref_count);
313 }
314
315 /*
316 * debug_info_put:
317 * - decreases reference count for debug-info and frees it if necessary
318 */
319
320 static void debug_info_put(debug_info_t *db_info)
321 {
322 int i;
323
324 if (!db_info)
325 return;
326 if (atomic_dec_and_test(&db_info->ref_count)) {
327 #ifdef DEBUG
328 printk(KERN_INFO "debug: freeing debug area %p (%s)\n",
329 db_info, db_info->name);
330 #endif
331 for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
332 if (db_info->views[i] == NULL)
333 continue;
334 #ifdef CONFIG_PROC_FS
335 remove_proc_entry(db_info->proc_entries[i]->name,
336 db_info->proc_root_entry);
337 #endif
338 }
339 #ifdef CONFIG_PROC_FS
340 remove_proc_entry(db_info->proc_root_entry->name,
341 debug_proc_root_entry);
342 #endif
343 if(db_info == debug_area_first)
344 debug_area_first = db_info->next;
345 if(db_info == debug_area_last)
346 debug_area_last = db_info->prev;
347 if(db_info->prev) db_info->prev->next = db_info->next;
348 if(db_info->next) db_info->next->prev = db_info->prev;
349 debug_info_free(db_info);
350 }
351 }
352
353 /*
354 * debug_format_entry:
355 * - format one debug entry and return size of formated data
356 */
357
358 static int debug_format_entry(file_private_info_t *p_info)
359 {
360 debug_info_t *id_org = p_info->debug_info_org;
361 debug_info_t *id_snap = p_info->debug_info_snap;
362 struct debug_view *view = p_info->view;
363 debug_entry_t *act_entry;
364 size_t len = 0;
365 if(p_info->act_entry == DEBUG_PROLOG_ENTRY){
366 /* print prolog */
367 if (view->prolog_proc)
368 len += view->prolog_proc(id_org, view,p_info->temp_buf);
369 goto out;
370 }
371
372 act_entry = (debug_entry_t *) ((char*)id_snap->areas[p_info->act_area] +
373 p_info->act_entry);
374
375 if (act_entry->id.stck == 0LL)
376 goto out; /* empty entry */
377 if (view->header_proc)
378 len += view->header_proc(id_org, view, p_info->act_area,
379 act_entry, p_info->temp_buf + len);
380 if (view->format_proc)
381 len += view->format_proc(id_org, view, p_info->temp_buf + len,
382 DEBUG_DATA(act_entry));
383 out:
384 return len;
385 }
386
387 /*
388 * debug_next_entry:
389 * - goto next entry in p_info
390 */
391
392 extern inline int debug_next_entry(file_private_info_t *p_info)
393 {
394 debug_info_t *id = p_info->debug_info_snap;
395 if(p_info->act_entry == DEBUG_PROLOG_ENTRY){
396 p_info->act_entry = 0;
397 goto out;
398 }
399 if ((p_info->act_entry += id->entry_size)
400 > ((PAGE_SIZE << (id->page_order))
401 - id->entry_size)){
402
403 /* next area */
404 p_info->act_entry = 0;
405 p_info->act_area++;
406 if(p_info->act_area >= id->nr_areas)
407 return 1;
408 }
409 out:
410 return 0;
411 }
412
413 /*
414 * debug_output:
415 * - called for user read()
416 * - copies formated debug entries to the user buffer
417 */
418
419 static ssize_t debug_output(struct file *file, /* file descriptor */
420 char __user *user_buf, /* user buffer */
421 size_t len, /* length of buffer */
422 loff_t *offset) /* offset in the file */
423 {
424 size_t count = 0;
425 size_t entry_offset, size = 0;
426 file_private_info_t *p_info;
427
428 p_info = ((file_private_info_t *) file->private_data);
429 if (*offset != p_info->offset)
430 return -EPIPE;
431 if(p_info->act_area >= p_info->debug_info_snap->nr_areas)
432 return 0;
433
434 entry_offset = p_info->act_entry_offset;
435
436 while(count < len){
437 size = debug_format_entry(p_info);
438 size = min((len - count), (size - entry_offset));
439
440 if(size){
441 if (copy_to_user(user_buf + count,
442 p_info->temp_buf + entry_offset, size))
443 return -EFAULT;
444 }
445 count += size;
446 entry_offset = 0;
447 if(count != len)
448 if(debug_next_entry(p_info))
449 goto out;
450 }
451 out:
452 p_info->offset = *offset + count;
453 p_info->act_entry_offset = size;
454 *offset = p_info->offset;
455 return count;
456 }
457
458 /*
459 * debug_input:
460 * - called for user write()
461 * - calls input function of view
462 */
463
464 static ssize_t debug_input(struct file *file,
465 const char __user *user_buf, size_t length,
466 loff_t *offset)
467 {
468 int rc = 0;
469 file_private_info_t *p_info;
470
471 down(&debug_lock);
472 p_info = ((file_private_info_t *) file->private_data);
473 if (p_info->view->input_proc)
474 rc = p_info->view->input_proc(p_info->debug_info_org,
475 p_info->view, file, user_buf,
476 length, offset);
477 else
478 rc = -EPERM;
479 up(&debug_lock);
480 return rc; /* number of input characters */
481 }
482
483 /*
484 * debug_open:
485 * - called for user open()
486 * - copies formated output to private_data area of the file
487 * handle
488 */
489
490 static int debug_open(struct inode *inode, struct file *file)
491 {
492 int i = 0, rc = 0;
493 file_private_info_t *p_info;
494 debug_info_t *debug_info, *debug_info_snapshot;
495
496 #ifdef DEBUG
497 printk("debug_open\n");
498 #endif
499 down(&debug_lock);
500
501 /* find debug log and view */
502
503 debug_info = debug_area_first;
504 while(debug_info != NULL){
505 for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
506 if (debug_info->views[i] == NULL)
507 continue;
508 else if (debug_info->proc_entries[i] ==
509 PDE(file->f_dentry->d_inode)) {
510 goto found; /* found view ! */
511 }
512 }
513 debug_info = debug_info->next;
514 }
515 /* no entry found */
516 rc = -EINVAL;
517 goto out;
518
519 found:
520
521 /* make snapshot of current debug areas to get it consistent */
522
523 debug_info_snapshot = debug_info_copy(debug_info);
524
525 if(!debug_info_snapshot){
526 #ifdef DEBUG
527 printk(KERN_ERR "debug_open: debug_info_copy failed (out of mem)\n");
528 #endif
529 rc = -ENOMEM;
530 goto out;
531 }
532
533 if ((file->private_data =
534 kmalloc(sizeof(file_private_info_t), GFP_ATOMIC)) == 0) {
535 #ifdef DEBUG
536 printk(KERN_ERR "debug_open: kmalloc failed\n");
537 #endif
538 debug_info_free(debug_info_snapshot);
539 rc = -ENOMEM;
540 goto out;
541 }
542 p_info = (file_private_info_t *) file->private_data;
543 p_info->offset = 0;
544 p_info->debug_info_snap = debug_info_snapshot;
545 p_info->debug_info_org = debug_info;
546 p_info->view = debug_info->views[i];
547 p_info->act_area = 0;
548 p_info->act_entry = DEBUG_PROLOG_ENTRY;
549 p_info->act_entry_offset = 0;
550
551 debug_info_get(debug_info);
552
553 out:
554 up(&debug_lock);
555 return rc;
556 }
557
558 /*
559 * debug_close:
560 * - called for user close()
561 * - deletes private_data area of the file handle
562 */
563
564 static int debug_close(struct inode *inode, struct file *file)
565 {
566 file_private_info_t *p_info;
567 #ifdef DEBUG
568 printk("debug_close\n");
569 #endif
570 p_info = (file_private_info_t *) file->private_data;
571 debug_info_free(p_info->debug_info_snap);
572 debug_info_put(p_info->debug_info_org);
573 kfree(file->private_data);
574 return 0; /* success */
575 }
576
577 /*
578 * debug_register:
579 * - creates and initializes debug area for the caller
580 * - returns handle for debug area
581 */
582
583 debug_info_t *debug_register
584 (char *name, int page_order, int nr_areas, int buf_size)
585 {
586 debug_info_t *rc = NULL;
587
588 if (!initialized)
589 BUG();
590 down(&debug_lock);
591
592 /* create new debug_info */
593
594 rc = debug_info_create(name, page_order, nr_areas, buf_size);
595 if(!rc)
596 goto out;
597 debug_register_view(rc, &debug_level_view);
598 debug_register_view(rc, &debug_flush_view);
599 #ifdef DEBUG
600 printk(KERN_INFO
601 "debug: reserved %d areas of %d pages for debugging %s\n",
602 nr_areas, 1 << page_order, rc->name);
603 #endif
604 out:
605 if (rc == NULL){
606 printk(KERN_ERR "debug: debug_register failed for %s\n",name);
607 }
608 up(&debug_lock);
609 return rc;
610 }
611
612 /*
613 * debug_unregister:
614 * - give back debug area
615 */
616
617 void debug_unregister(debug_info_t * id)
618 {
619 if (!id)
620 goto out;
621 down(&debug_lock);
622 #ifdef DEBUG
623 printk(KERN_INFO "debug: unregistering %s\n", id->name);
624 #endif
625 debug_info_put(id);
626 up(&debug_lock);
627
628 out:
629 return;
630 }
631
632 /*
633 * debug_set_level:
634 * - set actual debug level
635 */
636
637 void debug_set_level(debug_info_t* id, int new_level)
638 {
639 unsigned long flags;
640 if(!id)
641 return;
642 spin_lock_irqsave(&id->lock,flags);
643 if(new_level == DEBUG_OFF_LEVEL){
644 id->level = DEBUG_OFF_LEVEL;
645 printk(KERN_INFO "debug: %s: switched off\n",id->name);
646 } else if ((new_level > DEBUG_MAX_LEVEL) || (new_level < 0)) {
647 printk(KERN_INFO
648 "debug: %s: level %i is out of range (%i - %i)\n",
649 id->name, new_level, 0, DEBUG_MAX_LEVEL);
650 } else {
651 id->level = new_level;
652 #ifdef DEBUG
653 printk(KERN_INFO
654 "debug: %s: new level %i\n",id->name,id->level);
655 #endif
656 }
657 spin_unlock_irqrestore(&id->lock,flags);
658 }
659
660
661 /*
662 * proceed_active_entry:
663 * - set active entry to next in the ring buffer
664 */
665
666 extern inline void proceed_active_entry(debug_info_t * id)
667 {
668 if ((id->active_entry[id->active_area] += id->entry_size)
669 > ((PAGE_SIZE << (id->page_order)) - id->entry_size))
670 id->active_entry[id->active_area] = 0;
671 }
672
673 /*
674 * proceed_active_area:
675 * - set active area to next in the ring buffer
676 */
677
678 extern inline void proceed_active_area(debug_info_t * id)
679 {
680 id->active_area++;
681 id->active_area = id->active_area % id->nr_areas;
682 }
683
684 /*
685 * get_active_entry:
686 */
687
688 extern inline debug_entry_t *get_active_entry(debug_info_t * id)
689 {
690 return (debug_entry_t *) ((char *) id->areas[id->active_area] +
691 id->active_entry[id->active_area]);
692 }
693
694 /*
695 * debug_finish_entry:
696 * - set timestamp, caller address, cpu number etc.
697 */
698
699 extern inline void debug_finish_entry(debug_info_t * id, debug_entry_t* active,
700 int level, int exception)
701 {
702 STCK(active->id.stck);
703 active->id.fields.cpuid = smp_processor_id();
704 active->caller = __builtin_return_address(0);
705 active->id.fields.exception = exception;
706 active->id.fields.level = level;
707 proceed_active_entry(id);
708 if(exception)
709 proceed_active_area(id);
710 }
711
712 static int debug_stoppable=1;
713 static int debug_active=1;
714
715 #define CTL_S390DBF 5677
716 #define CTL_S390DBF_STOPPABLE 5678
717 #define CTL_S390DBF_ACTIVE 5679
718
719 /*
720 * proc handler for the running debug_active sysctl
721 * always allow read, allow write only if debug_stoppable is set or
722 * if debug_active is already off
723 */
724 static int s390dbf_procactive(ctl_table *table, int write, struct file *filp,
725 void __user *buffer, size_t *lenp, loff_t *ppos)
726 {
727 if (!write || debug_stoppable || !debug_active)
728 return proc_dointvec(table, write, filp, buffer, lenp, ppos);
729 else
730 return 0;
731 }
732
733
734 static struct ctl_table s390dbf_table[] = {
735 {
736 .ctl_name = CTL_S390DBF_STOPPABLE,
737 .procname = "debug_stoppable",
738 .data = &debug_stoppable,
739 .maxlen = sizeof(int),
740 .mode = S_IRUGO | S_IWUSR,
741 .proc_handler = &proc_dointvec,
742 .strategy = &sysctl_intvec,
743 },
744 {
745 .ctl_name = CTL_S390DBF_ACTIVE,
746 .procname = "debug_active",
747 .data = &debug_active,
748 .maxlen = sizeof(int),
749 .mode = S_IRUGO | S_IWUSR,
750 .proc_handler = &s390dbf_procactive,
751 .strategy = &sysctl_intvec,
752 },
753 { .ctl_name = 0 }
754 };
755
756 static struct ctl_table s390dbf_dir_table[] = {
757 {
758 .ctl_name = CTL_S390DBF,
759 .procname = "s390dbf",
760 .maxlen = 0,
761 .mode = S_IRUGO | S_IXUGO,
762 .child = s390dbf_table,
763 },
764 { .ctl_name = 0 }
765 };
766
767 struct ctl_table_header *s390dbf_sysctl_header;
768
769 void debug_stop_all(void)
770 {
771 if (debug_stoppable)
772 debug_active = 0;
773 }
774
775
776 /*
777 * debug_event_common:
778 * - write debug entry with given size
779 */
780
781 debug_entry_t *debug_event_common(debug_info_t * id, int level, const void *buf,
782 int len)
783 {
784 unsigned long flags;
785 debug_entry_t *active;
786
787 if (!debug_active)
788 return NULL;
789 spin_lock_irqsave(&id->lock, flags);
790 active = get_active_entry(id);
791 memset(DEBUG_DATA(active), 0, id->buf_size);
792 memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size));
793 debug_finish_entry(id, active, level, 0);
794 spin_unlock_irqrestore(&id->lock, flags);
795
796 return active;
797 }
798
799 /*
800 * debug_exception_common:
801 * - write debug entry with given size and switch to next debug area
802 */
803
804 debug_entry_t *debug_exception_common(debug_info_t * id, int level,
805 const void *buf, int len)
806 {
807 unsigned long flags;
808 debug_entry_t *active;
809
810 if (!debug_active)
811 return NULL;
812 spin_lock_irqsave(&id->lock, flags);
813 active = get_active_entry(id);
814 memset(DEBUG_DATA(active), 0, id->buf_size);
815 memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size));
816 debug_finish_entry(id, active, level, 1);
817 spin_unlock_irqrestore(&id->lock, flags);
818
819 return active;
820 }
821
822 /*
823 * counts arguments in format string for sprintf view
824 */
825
826 extern inline int debug_count_numargs(char *string)
827 {
828 int numargs=0;
829
830 while(*string) {
831 if(*string++=='%')
832 numargs++;
833 }
834 return(numargs);
835 }
836
837 /*
838 * debug_sprintf_event:
839 */
840
841 debug_entry_t *debug_sprintf_event(debug_info_t* id,
842 int level,char *string,...)
843 {
844 va_list ap;
845 int numargs,idx;
846 unsigned long flags;
847 debug_sprintf_entry_t *curr_event;
848 debug_entry_t *active;
849
850 if((!id) || (level > id->level))
851 return NULL;
852 if (!debug_active)
853 return NULL;
854 numargs=debug_count_numargs(string);
855
856 spin_lock_irqsave(&id->lock, flags);
857 active = get_active_entry(id);
858 curr_event=(debug_sprintf_entry_t *) DEBUG_DATA(active);
859 va_start(ap,string);
860 curr_event->string=string;
861 for(idx=0;idx<min(numargs,(int)(id->buf_size / sizeof(long))-1);idx++)
862 curr_event->args[idx]=va_arg(ap,long);
863 va_end(ap);
864 debug_finish_entry(id, active, level, 0);
865 spin_unlock_irqrestore(&id->lock, flags);
866
867 return active;
868 }
869
870 /*
871 * debug_sprintf_exception:
872 */
873
874 debug_entry_t *debug_sprintf_exception(debug_info_t* id,
875 int level,char *string,...)
876 {
877 va_list ap;
878 int numargs,idx;
879 unsigned long flags;
880 debug_sprintf_entry_t *curr_event;
881 debug_entry_t *active;
882
883 if((!id) || (level > id->level))
884 return NULL;
885 if (!debug_active)
886 return NULL;
887
888 numargs=debug_count_numargs(string);
889
890 spin_lock_irqsave(&id->lock, flags);
891 active = get_active_entry(id);
892 curr_event=(debug_sprintf_entry_t *)DEBUG_DATA(active);
893 va_start(ap,string);
894 curr_event->string=string;
895 for(idx=0;idx<min(numargs,(int)(id->buf_size / sizeof(long))-1);idx++)
896 curr_event->args[idx]=va_arg(ap,long);
897 va_end(ap);
898 debug_finish_entry(id, active, level, 1);
899 spin_unlock_irqrestore(&id->lock, flags);
900
901 return active;
902 }
903
904 /*
905 * debug_init:
906 * - is called exactly once to initialize the debug feature
907 */
908
909 static int __init debug_init(void)
910 {
911 int rc = 0;
912
913 s390dbf_sysctl_header = register_sysctl_table(s390dbf_dir_table, 1);
914 down(&debug_lock);
915 #ifdef CONFIG_PROC_FS
916 debug_proc_root_entry = proc_mkdir(DEBUG_DIR_ROOT, NULL);
917 #endif /* CONFIG_PROC_FS */
918 printk(KERN_INFO "debug: Initialization complete\n");
919 initialized = 1;
920 up(&debug_lock);
921
922 return rc;
923 }
924
925 /*
926 * debug_register_view:
927 */
928
929 int debug_register_view(debug_info_t * id, struct debug_view *view)
930 {
931 int rc = 0;
932 int i;
933 unsigned long flags;
934 mode_t mode = S_IFREG;
935 struct proc_dir_entry *pde;
936
937 if (!id)
938 goto out;
939 if (view->prolog_proc || view->format_proc || view->header_proc)
940 mode |= S_IRUSR;
941 if (view->input_proc)
942 mode |= S_IWUSR;
943 pde = create_proc_entry(view->name, mode, id->proc_root_entry);
944 if (!pde){
945 printk(KERN_WARNING "debug: create_proc_entry() failed! Cannot register view %s/%s\n", id->name,view->name);
946 rc = -1;
947 goto out;
948 }
949
950 spin_lock_irqsave(&id->lock, flags);
951 for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
952 if (id->views[i] == NULL)
953 break;
954 }
955 if (i == DEBUG_MAX_VIEWS) {
956 printk(KERN_WARNING "debug: cannot register view %s/%s\n",
957 id->name,view->name);
958 printk(KERN_WARNING
959 "debug: maximum number of views reached (%i)!\n", i);
960 remove_proc_entry(pde->name, id->proc_root_entry);
961 rc = -1;
962 }
963 else {
964 id->views[i] = view;
965 pde->proc_fops = &debug_file_ops;
966 id->proc_entries[i] = pde;
967 }
968 spin_unlock_irqrestore(&id->lock, flags);
969 out:
970 return rc;
971 }
972
973 /*
974 * debug_unregister_view:
975 */
976
977 int debug_unregister_view(debug_info_t * id, struct debug_view *view)
978 {
979 int rc = 0;
980 int i;
981 unsigned long flags;
982
983 if (!id)
984 goto out;
985 spin_lock_irqsave(&id->lock, flags);
986 for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
987 if (id->views[i] == view)
988 break;
989 }
990 if (i == DEBUG_MAX_VIEWS)
991 rc = -1;
992 else {
993 #ifdef CONFIG_PROC_FS
994 remove_proc_entry(id->proc_entries[i]->name,
995 id->proc_root_entry);
996 #endif
997 id->views[i] = NULL;
998 rc = 0;
999 }
1000 spin_unlock_irqrestore(&id->lock, flags);
1001 out:
1002 return rc;
1003 }
1004
1005 /*
1006 * functions for debug-views
1007 ***********************************
1008 */
1009
1010 /*
1011 * prints out actual debug level
1012 */
1013
1014 static int debug_prolog_level_fn(debug_info_t * id,
1015 struct debug_view *view, char *out_buf)
1016 {
1017 int rc = 0;
1018
1019 if(id->level == -1) rc = sprintf(out_buf,"-\n");
1020 else rc = sprintf(out_buf, "%i\n", id->level);
1021 return rc;
1022 }
1023
1024 /*
1025 * reads new debug level
1026 */
1027
1028 static int debug_input_level_fn(debug_info_t * id, struct debug_view *view,
1029 struct file *file, const char __user *user_buf,
1030 size_t in_buf_size, loff_t * offset)
1031 {
1032 char input_buf[1];
1033 int rc = in_buf_size;
1034
1035 if (*offset != 0)
1036 goto out;
1037 if (copy_from_user(input_buf, user_buf, 1)){
1038 rc = -EFAULT;
1039 goto out;
1040 }
1041 if (isdigit(input_buf[0])) {
1042 int new_level = ((int) input_buf[0] - (int) '0');
1043 debug_set_level(id, new_level);
1044 } else if(input_buf[0] == '-') {
1045 debug_set_level(id, DEBUG_OFF_LEVEL);
1046 } else {
1047 printk(KERN_INFO "debug: level `%c` is not valid\n",
1048 input_buf[0]);
1049 }
1050 out:
1051 *offset += in_buf_size;
1052 return rc; /* number of input characters */
1053 }
1054
1055
1056 /*
1057 * flushes debug areas
1058 */
1059
1060 void debug_flush(debug_info_t* id, int area)
1061 {
1062 unsigned long flags;
1063 int i;
1064
1065 if(!id)
1066 return;
1067 spin_lock_irqsave(&id->lock,flags);
1068 if(area == DEBUG_FLUSH_ALL){
1069 id->active_area = 0;
1070 memset(id->active_entry, 0, id->nr_areas * sizeof(int));
1071 for (i = 0; i < id->nr_areas; i++)
1072 memset(id->areas[i], 0, PAGE_SIZE << id->page_order);
1073 printk(KERN_INFO "debug: %s: all areas flushed\n",id->name);
1074 } else if(area >= 0 && area < id->nr_areas) {
1075 id->active_entry[area] = 0;
1076 memset(id->areas[area], 0, PAGE_SIZE << id->page_order);
1077 printk(KERN_INFO
1078 "debug: %s: area %i has been flushed\n",
1079 id->name, area);
1080 } else {
1081 printk(KERN_INFO
1082 "debug: %s: area %i cannot be flushed (range: %i - %i)\n",
1083 id->name, area, 0, id->nr_areas-1);
1084 }
1085 spin_unlock_irqrestore(&id->lock,flags);
1086 }
1087
1088 /*
1089 * view function: flushes debug areas
1090 */
1091
1092 static int debug_input_flush_fn(debug_info_t * id, struct debug_view *view,
1093 struct file *file, const char __user *user_buf,
1094 size_t in_buf_size, loff_t * offset)
1095 {
1096 char input_buf[1];
1097 int rc = in_buf_size;
1098
1099 if (*offset != 0)
1100 goto out;
1101 if (copy_from_user(input_buf, user_buf, 1)){
1102 rc = -EFAULT;
1103 goto out;
1104 }
1105 if(input_buf[0] == '-') {
1106 debug_flush(id, DEBUG_FLUSH_ALL);
1107 goto out;
1108 }
1109 if (isdigit(input_buf[0])) {
1110 int area = ((int) input_buf[0] - (int) '0');
1111 debug_flush(id, area);
1112 goto out;
1113 }
1114
1115 printk(KERN_INFO "debug: area `%c` is not valid\n", input_buf[0]);
1116
1117 out:
1118 *offset += in_buf_size;
1119 return rc; /* number of input characters */
1120 }
1121
1122 /*
1123 * prints debug header in raw format
1124 */
1125
1126 int debug_raw_header_fn(debug_info_t * id, struct debug_view *view,
1127 int area, debug_entry_t * entry, char *out_buf)
1128 {
1129 int rc;
1130
1131 rc = sizeof(debug_entry_t);
1132 memcpy(out_buf,entry,sizeof(debug_entry_t));
1133 return rc;
1134 }
1135
1136 /*
1137 * prints debug data in raw format
1138 */
1139
1140 static int debug_raw_format_fn(debug_info_t * id, struct debug_view *view,
1141 char *out_buf, const char *in_buf)
1142 {
1143 int rc;
1144
1145 rc = id->buf_size;
1146 memcpy(out_buf, in_buf, id->buf_size);
1147 return rc;
1148 }
1149
1150 /*
1151 * prints debug data in hex/ascii format
1152 */
1153
1154 static int debug_hex_ascii_format_fn(debug_info_t * id, struct debug_view *view,
1155 char *out_buf, const char *in_buf)
1156 {
1157 int i, rc = 0;
1158
1159 for (i = 0; i < id->buf_size; i++) {
1160 rc += sprintf(out_buf + rc, "%02x ",
1161 ((unsigned char *) in_buf)[i]);
1162 }
1163 rc += sprintf(out_buf + rc, "| ");
1164 for (i = 0; i < id->buf_size; i++) {
1165 unsigned char c = in_buf[i];
1166 if (!isprint(c))
1167 rc += sprintf(out_buf + rc, ".");
1168 else
1169 rc += sprintf(out_buf + rc, "%c", c);
1170 }
1171 rc += sprintf(out_buf + rc, "\n");
1172 return rc;
1173 }
1174
1175 /*
1176 * prints header for debug entry
1177 */
1178
1179 int debug_dflt_header_fn(debug_info_t * id, struct debug_view *view,
1180 int area, debug_entry_t * entry, char *out_buf)
1181 {
1182 struct timeval time_val;
1183 unsigned long long time;
1184 char *except_str;
1185 unsigned long caller;
1186 int rc = 0;
1187 unsigned int level;
1188
1189 level = entry->id.fields.level;
1190 time = entry->id.stck;
1191 /* adjust todclock to 1970 */
1192 time -= 0x8126d60e46000000LL - (0x3c26700LL * 1000000 * 4096);
1193 tod_to_timeval(time, &time_val);
1194
1195 if (entry->id.fields.exception)
1196 except_str = "*";
1197 else
1198 except_str = "-";
1199 caller = ((unsigned long) entry->caller) & PSW_ADDR_INSN;
1200 rc += sprintf(out_buf, "%02i %011lu:%06lu %1u %1s %02i %p ",
1201 area, time_val.tv_sec, time_val.tv_usec, level,
1202 except_str, entry->id.fields.cpuid, (void *) caller);
1203 return rc;
1204 }
1205
1206 /*
1207 * prints debug data sprintf-formated:
1208 * debug_sprinf_event/exception calls must be used together with this view
1209 */
1210
1211 #define DEBUG_SPRINTF_MAX_ARGS 10
1212
1213 int debug_sprintf_format_fn(debug_info_t * id, struct debug_view *view,
1214 char *out_buf, debug_sprintf_entry_t *curr_event)
1215 {
1216 int num_longs, num_used_args = 0,i, rc = 0;
1217 int index[DEBUG_SPRINTF_MAX_ARGS];
1218
1219 /* count of longs fit into one entry */
1220 num_longs = id->buf_size / sizeof(long);
1221
1222 if(num_longs < 1)
1223 goto out; /* bufsize of entry too small */
1224 if(num_longs == 1) {
1225 /* no args, we use only the string */
1226 strcpy(out_buf, curr_event->string);
1227 rc = strlen(curr_event->string);
1228 goto out;
1229 }
1230
1231 /* number of arguments used for sprintf (without the format string) */
1232 num_used_args = min(DEBUG_SPRINTF_MAX_ARGS, (num_longs - 1));
1233
1234 memset(index,0, DEBUG_SPRINTF_MAX_ARGS * sizeof(int));
1235
1236 for(i = 0; i < num_used_args; i++)
1237 index[i] = i;
1238
1239 rc = sprintf(out_buf, curr_event->string, curr_event->args[index[0]],
1240 curr_event->args[index[1]], curr_event->args[index[2]],
1241 curr_event->args[index[3]], curr_event->args[index[4]],
1242 curr_event->args[index[5]], curr_event->args[index[6]],
1243 curr_event->args[index[7]], curr_event->args[index[8]],
1244 curr_event->args[index[9]]);
1245
1246 out:
1247
1248 return rc;
1249 }
1250
1251 /*
1252 * clean up module
1253 */
1254 void __exit debug_exit(void)
1255 {
1256 #ifdef DEBUG
1257 printk("debug_cleanup_module: \n");
1258 #endif
1259 #ifdef CONFIG_PROC_FS
1260 remove_proc_entry(debug_proc_root_entry->name, NULL);
1261 #endif /* CONFIG_PROC_FS */
1262 unregister_sysctl_table(s390dbf_sysctl_header);
1263 return;
1264 }
1265
1266 /*
1267 * module definitions
1268 */
1269 core_initcall(debug_init);
1270 module_exit(debug_exit);
1271 MODULE_LICENSE("GPL");
1272
1273 EXPORT_SYMBOL(debug_register);
1274 EXPORT_SYMBOL(debug_unregister);
1275 EXPORT_SYMBOL(debug_set_level);
1276 EXPORT_SYMBOL(debug_stop_all);
1277 EXPORT_SYMBOL(debug_register_view);
1278 EXPORT_SYMBOL(debug_unregister_view);
1279 EXPORT_SYMBOL(debug_event_common);
1280 EXPORT_SYMBOL(debug_exception_common);
1281 EXPORT_SYMBOL(debug_hex_ascii_view);
1282 EXPORT_SYMBOL(debug_raw_view);
1283 EXPORT_SYMBOL(debug_dflt_header_fn);
1284 EXPORT_SYMBOL(debug_sprintf_view);
1285 EXPORT_SYMBOL(debug_sprintf_exception);
1286 EXPORT_SYMBOL(debug_sprintf_event);
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