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5
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10
11
12#define KMSG_COMPONENT "s390dbf"
13#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
14
15#include <linux/stddef.h>
16#include <linux/kernel.h>
17#include <linux/errno.h>
18#include <linux/slab.h>
19#include <linux/ctype.h>
20#include <linux/string.h>
21#include <linux/sysctl.h>
22#include <asm/uaccess.h>
23#include <linux/module.h>
24#include <linux/init.h>
25#include <linux/fs.h>
26#include <linux/debugfs.h>
27
28#include <asm/debug.h>
29
30#define DEBUG_PROLOG_ENTRY -1
31
32#define ALL_AREAS 0
33#define NO_AREAS 1
34
35
36
37typedef struct file_private_info {
38 loff_t offset;
39 int act_area;
40 int act_page;
41 int act_entry;
42
43
44 size_t act_entry_offset;
45
46
47 char temp_buf[2048];
48 debug_info_t *debug_info_org;
49 debug_info_t *debug_info_snap;
50 struct debug_view *view;
51} file_private_info_t;
52
53typedef struct
54{
55 char *string;
56
57
58
59
60
61
62 long args[0];
63} debug_sprintf_entry_t;
64
65
66
67
68static int debug_init(void);
69static ssize_t debug_output(struct file *file, char __user *user_buf,
70 size_t user_len, loff_t * offset);
71static ssize_t debug_input(struct file *file, const char __user *user_buf,
72 size_t user_len, loff_t * offset);
73static int debug_open(struct inode *inode, struct file *file);
74static int debug_close(struct inode *inode, struct file *file);
75static debug_info_t *debug_info_create(const char *name, int pages_per_area,
76 int nr_areas, int buf_size, umode_t mode);
77static void debug_info_get(debug_info_t *);
78static void debug_info_put(debug_info_t *);
79static int debug_prolog_level_fn(debug_info_t * id,
80 struct debug_view *view, char *out_buf);
81static int debug_input_level_fn(debug_info_t * id, struct debug_view *view,
82 struct file *file, const char __user *user_buf,
83 size_t user_buf_size, loff_t * offset);
84static int debug_prolog_pages_fn(debug_info_t * id,
85 struct debug_view *view, char *out_buf);
86static int debug_input_pages_fn(debug_info_t * id, struct debug_view *view,
87 struct file *file, const char __user *user_buf,
88 size_t user_buf_size, loff_t * offset);
89static int debug_input_flush_fn(debug_info_t * id, struct debug_view *view,
90 struct file *file, const char __user *user_buf,
91 size_t user_buf_size, loff_t * offset);
92static int debug_hex_ascii_format_fn(debug_info_t * id, struct debug_view *view,
93 char *out_buf, const char *in_buf);
94static int debug_raw_format_fn(debug_info_t * id,
95 struct debug_view *view, char *out_buf,
96 const char *in_buf);
97static int debug_raw_header_fn(debug_info_t * id, struct debug_view *view,
98 int area, debug_entry_t * entry, char *out_buf);
99
100static int debug_sprintf_format_fn(debug_info_t * id, struct debug_view *view,
101 char *out_buf, debug_sprintf_entry_t *curr_event);
102
103
104
105struct debug_view debug_raw_view = {
106 "raw",
107 NULL,
108 &debug_raw_header_fn,
109 &debug_raw_format_fn,
110 NULL,
111 NULL
112};
113EXPORT_SYMBOL(debug_raw_view);
114
115struct 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};
123EXPORT_SYMBOL(debug_hex_ascii_view);
124
125static struct debug_view debug_level_view = {
126 "level",
127 &debug_prolog_level_fn,
128 NULL,
129 NULL,
130 &debug_input_level_fn,
131 NULL
132};
133
134static struct debug_view debug_pages_view = {
135 "pages",
136 &debug_prolog_pages_fn,
137 NULL,
138 NULL,
139 &debug_input_pages_fn,
140 NULL
141};
142
143static struct debug_view debug_flush_view = {
144 "flush",
145 NULL,
146 NULL,
147 NULL,
148 &debug_input_flush_fn,
149 NULL
150};
151
152struct debug_view debug_sprintf_view = {
153 "sprintf",
154 NULL,
155 &debug_dflt_header_fn,
156 (debug_format_proc_t*)&debug_sprintf_format_fn,
157 NULL,
158 NULL
159};
160EXPORT_SYMBOL(debug_sprintf_view);
161
162
163static unsigned int __used debug_feature_version = __DEBUG_FEATURE_VERSION;
164
165
166
167static debug_info_t *debug_area_first = NULL;
168static debug_info_t *debug_area_last = NULL;
169static DEFINE_MUTEX(debug_mutex);
170
171static int initialized;
172static int debug_critical;
173
174static const struct file_operations debug_file_ops = {
175 .owner = THIS_MODULE,
176 .read = debug_output,
177 .write = debug_input,
178 .open = debug_open,
179 .release = debug_close,
180 .llseek = no_llseek,
181};
182
183static struct dentry *debug_debugfs_root_entry;
184
185
186
187
188
189
190
191
192
193static debug_entry_t***
194debug_areas_alloc(int pages_per_area, int nr_areas)
195{
196 debug_entry_t*** areas;
197 int i,j;
198
199 areas = kmalloc(nr_areas *
200 sizeof(debug_entry_t**),
201 GFP_KERNEL);
202 if (!areas)
203 goto fail_malloc_areas;
204 for (i = 0; i < nr_areas; i++) {
205 areas[i] = kmalloc(pages_per_area *
206 sizeof(debug_entry_t*),GFP_KERNEL);
207 if (!areas[i]) {
208 goto fail_malloc_areas2;
209 }
210 for(j = 0; j < pages_per_area; j++) {
211 areas[i][j] = kzalloc(PAGE_SIZE, GFP_KERNEL);
212 if(!areas[i][j]) {
213 for(j--; j >=0 ; j--) {
214 kfree(areas[i][j]);
215 }
216 kfree(areas[i]);
217 goto fail_malloc_areas2;
218 }
219 }
220 }
221 return areas;
222
223fail_malloc_areas2:
224 for(i--; i >= 0; i--){
225 for(j=0; j < pages_per_area;j++){
226 kfree(areas[i][j]);
227 }
228 kfree(areas[i]);
229 }
230 kfree(areas);
231fail_malloc_areas:
232 return NULL;
233
234}
235
236
237
238
239
240
241
242static debug_info_t*
243debug_info_alloc(const char *name, int pages_per_area, int nr_areas,
244 int buf_size, int level, int mode)
245{
246 debug_info_t* rc;
247
248
249
250 rc = kmalloc(sizeof(debug_info_t), GFP_KERNEL);
251 if(!rc)
252 goto fail_malloc_rc;
253 rc->active_entries = kcalloc(nr_areas, sizeof(int), GFP_KERNEL);
254 if(!rc->active_entries)
255 goto fail_malloc_active_entries;
256 rc->active_pages = kcalloc(nr_areas, sizeof(int), GFP_KERNEL);
257 if(!rc->active_pages)
258 goto fail_malloc_active_pages;
259 if((mode == ALL_AREAS) && (pages_per_area != 0)){
260 rc->areas = debug_areas_alloc(pages_per_area, nr_areas);
261 if(!rc->areas)
262 goto fail_malloc_areas;
263 } else {
264 rc->areas = NULL;
265 }
266
267
268
269 spin_lock_init(&rc->lock);
270 rc->pages_per_area = pages_per_area;
271 rc->nr_areas = nr_areas;
272 rc->active_area = 0;
273 rc->level = level;
274 rc->buf_size = buf_size;
275 rc->entry_size = sizeof(debug_entry_t) + buf_size;
276 strlcpy(rc->name, name, sizeof(rc->name));
277 memset(rc->views, 0, DEBUG_MAX_VIEWS * sizeof(struct debug_view *));
278 memset(rc->debugfs_entries, 0 ,DEBUG_MAX_VIEWS *
279 sizeof(struct dentry*));
280 atomic_set(&(rc->ref_count), 0);
281
282 return rc;
283
284fail_malloc_areas:
285 kfree(rc->active_pages);
286fail_malloc_active_pages:
287 kfree(rc->active_entries);
288fail_malloc_active_entries:
289 kfree(rc);
290fail_malloc_rc:
291 return NULL;
292}
293
294
295
296
297
298
299static void
300debug_areas_free(debug_info_t* db_info)
301{
302 int i,j;
303
304 if(!db_info->areas)
305 return;
306 for (i = 0; i < db_info->nr_areas; i++) {
307 for(j = 0; j < db_info->pages_per_area; j++) {
308 kfree(db_info->areas[i][j]);
309 }
310 kfree(db_info->areas[i]);
311 }
312 kfree(db_info->areas);
313 db_info->areas = NULL;
314}
315
316
317
318
319
320
321static void
322debug_info_free(debug_info_t* db_info){
323 debug_areas_free(db_info);
324 kfree(db_info->active_entries);
325 kfree(db_info->active_pages);
326 kfree(db_info);
327}
328
329
330
331
332
333
334static debug_info_t*
335debug_info_create(const char *name, int pages_per_area, int nr_areas,
336 int buf_size, umode_t mode)
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 rc->mode = mode & ~S_IFMT;
346
347
348 rc->debugfs_root_entry = debugfs_create_dir(rc->name,
349 debug_debugfs_root_entry);
350
351
352 if (!debug_area_first) {
353
354 debug_area_first = rc;
355 rc->prev = NULL;
356 } else {
357
358 debug_area_last->next = rc;
359 rc->prev = debug_area_last;
360 }
361 debug_area_last = rc;
362 rc->next = NULL;
363
364 debug_info_get(rc);
365out:
366 return rc;
367}
368
369
370
371
372
373
374static debug_info_t*
375debug_info_copy(debug_info_t* in, int mode)
376{
377 int i,j;
378 debug_info_t* rc;
379 unsigned long flags;
380
381
382 do {
383 rc = debug_info_alloc(in->name, in->pages_per_area,
384 in->nr_areas, in->buf_size, in->level, mode);
385 spin_lock_irqsave(&in->lock, flags);
386 if(!rc)
387 goto out;
388
389 if((rc->pages_per_area == in->pages_per_area) &&
390 (rc->nr_areas == in->nr_areas)) {
391 break;
392 }
393 spin_unlock_irqrestore(&in->lock, flags);
394 debug_info_free(rc);
395 } while (1);
396
397 if (mode == NO_AREAS)
398 goto out;
399
400 for(i = 0; i < in->nr_areas; i++){
401 for(j = 0; j < in->pages_per_area; j++) {
402 memcpy(rc->areas[i][j], in->areas[i][j],PAGE_SIZE);
403 }
404 }
405out:
406 spin_unlock_irqrestore(&in->lock, flags);
407 return rc;
408}
409
410
411
412
413
414
415static void
416debug_info_get(debug_info_t * db_info)
417{
418 if (db_info)
419 atomic_inc(&db_info->ref_count);
420}
421
422
423
424
425
426
427static void
428debug_info_put(debug_info_t *db_info)
429{
430 int i;
431
432 if (!db_info)
433 return;
434 if (atomic_dec_and_test(&db_info->ref_count)) {
435 for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
436 if (!db_info->views[i])
437 continue;
438 debugfs_remove(db_info->debugfs_entries[i]);
439 }
440 debugfs_remove(db_info->debugfs_root_entry);
441 if(db_info == debug_area_first)
442 debug_area_first = db_info->next;
443 if(db_info == debug_area_last)
444 debug_area_last = db_info->prev;
445 if(db_info->prev) db_info->prev->next = db_info->next;
446 if(db_info->next) db_info->next->prev = db_info->prev;
447 debug_info_free(db_info);
448 }
449}
450
451
452
453
454
455
456static int
457debug_format_entry(file_private_info_t *p_info)
458{
459 debug_info_t *id_snap = p_info->debug_info_snap;
460 struct debug_view *view = p_info->view;
461 debug_entry_t *act_entry;
462 size_t len = 0;
463 if(p_info->act_entry == DEBUG_PROLOG_ENTRY){
464
465 if (view->prolog_proc)
466 len += view->prolog_proc(id_snap,view,p_info->temp_buf);
467 goto out;
468 }
469 if (!id_snap->areas)
470 goto out;
471 act_entry = (debug_entry_t *) ((char*)id_snap->areas[p_info->act_area]
472 [p_info->act_page] + p_info->act_entry);
473
474 if (act_entry->id.stck == 0LL)
475 goto out;
476 if (view->header_proc)
477 len += view->header_proc(id_snap, view, p_info->act_area,
478 act_entry, p_info->temp_buf + len);
479 if (view->format_proc)
480 len += view->format_proc(id_snap, view, p_info->temp_buf + len,
481 DEBUG_DATA(act_entry));
482out:
483 return len;
484}
485
486
487
488
489
490
491static inline int
492debug_next_entry(file_private_info_t *p_info)
493{
494 debug_info_t *id;
495
496 id = p_info->debug_info_snap;
497 if(p_info->act_entry == DEBUG_PROLOG_ENTRY){
498 p_info->act_entry = 0;
499 p_info->act_page = 0;
500 goto out;
501 }
502 if(!id->areas)
503 return 1;
504 p_info->act_entry += id->entry_size;
505
506 if (p_info->act_entry > (PAGE_SIZE - id->entry_size)){
507
508 p_info->act_entry = 0;
509 p_info->act_page += 1;
510 if((p_info->act_page % id->pages_per_area) == 0) {
511
512 p_info->act_area++;
513 p_info->act_page=0;
514 }
515 if(p_info->act_area >= id->nr_areas)
516 return 1;
517 }
518out:
519 return 0;
520}
521
522
523
524
525
526
527
528static ssize_t
529debug_output(struct file *file,
530 char __user *user_buf,
531 size_t len,
532 loff_t *offset)
533{
534 size_t count = 0;
535 size_t entry_offset;
536 file_private_info_t *p_info;
537
538 p_info = ((file_private_info_t *) file->private_data);
539 if (*offset != p_info->offset)
540 return -EPIPE;
541 if(p_info->act_area >= p_info->debug_info_snap->nr_areas)
542 return 0;
543 entry_offset = p_info->act_entry_offset;
544 while(count < len){
545 int formatted_line_size;
546 int formatted_line_residue;
547 int user_buf_residue;
548 size_t copy_size;
549
550 formatted_line_size = debug_format_entry(p_info);
551 formatted_line_residue = formatted_line_size - entry_offset;
552 user_buf_residue = len-count;
553 copy_size = min(user_buf_residue, formatted_line_residue);
554 if(copy_size){
555 if (copy_to_user(user_buf + count, p_info->temp_buf
556 + entry_offset, copy_size))
557 return -EFAULT;
558 count += copy_size;
559 entry_offset += copy_size;
560 }
561 if(copy_size == formatted_line_residue){
562 entry_offset = 0;
563 if(debug_next_entry(p_info))
564 goto out;
565 }
566 }
567out:
568 p_info->offset = *offset + count;
569 p_info->act_entry_offset = entry_offset;
570 *offset = p_info->offset;
571 return count;
572}
573
574
575
576
577
578
579
580static ssize_t
581debug_input(struct file *file, const char __user *user_buf, size_t length,
582 loff_t *offset)
583{
584 int rc = 0;
585 file_private_info_t *p_info;
586
587 mutex_lock(&debug_mutex);
588 p_info = ((file_private_info_t *) file->private_data);
589 if (p_info->view->input_proc)
590 rc = p_info->view->input_proc(p_info->debug_info_org,
591 p_info->view, file, user_buf,
592 length, offset);
593 else
594 rc = -EPERM;
595 mutex_unlock(&debug_mutex);
596 return rc;
597}
598
599
600
601
602
603
604
605
606static int
607debug_open(struct inode *inode, struct file *file)
608{
609 int i, rc = 0;
610 file_private_info_t *p_info;
611 debug_info_t *debug_info, *debug_info_snapshot;
612
613 mutex_lock(&debug_mutex);
614 debug_info = file_inode(file)->i_private;
615
616 for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
617 if (!debug_info->views[i])
618 continue;
619 else if (debug_info->debugfs_entries[i] ==
620 file->f_path.dentry) {
621 goto found;
622 }
623 }
624
625 rc = -EINVAL;
626 goto out;
627
628found:
629
630
631
632
633
634 if(!debug_info->views[i]->format_proc &&
635 !debug_info->views[i]->header_proc){
636 debug_info_snapshot = debug_info_copy(debug_info, NO_AREAS);
637 } else {
638 debug_info_snapshot = debug_info_copy(debug_info, ALL_AREAS);
639 }
640
641 if(!debug_info_snapshot){
642 rc = -ENOMEM;
643 goto out;
644 }
645 p_info = kmalloc(sizeof(file_private_info_t),
646 GFP_KERNEL);
647 if(!p_info){
648 debug_info_free(debug_info_snapshot);
649 rc = -ENOMEM;
650 goto out;
651 }
652 p_info->offset = 0;
653 p_info->debug_info_snap = debug_info_snapshot;
654 p_info->debug_info_org = debug_info;
655 p_info->view = debug_info->views[i];
656 p_info->act_area = 0;
657 p_info->act_page = 0;
658 p_info->act_entry = DEBUG_PROLOG_ENTRY;
659 p_info->act_entry_offset = 0;
660 file->private_data = p_info;
661 debug_info_get(debug_info);
662 nonseekable_open(inode, file);
663out:
664 mutex_unlock(&debug_mutex);
665 return rc;
666}
667
668
669
670
671
672
673
674static int
675debug_close(struct inode *inode, struct file *file)
676{
677 file_private_info_t *p_info;
678 p_info = (file_private_info_t *) file->private_data;
679 if(p_info->debug_info_snap)
680 debug_info_free(p_info->debug_info_snap);
681 debug_info_put(p_info->debug_info_org);
682 kfree(file->private_data);
683 return 0;
684}
685
686
687
688
689
690
691
692
693debug_info_t *debug_register_mode(const char *name, int pages_per_area,
694 int nr_areas, int buf_size, umode_t mode,
695 uid_t uid, gid_t gid)
696{
697 debug_info_t *rc = NULL;
698
699
700
701 if ((uid != 0) || (gid != 0))
702 pr_warn("Root becomes the owner of all s390dbf files in sysfs\n");
703 BUG_ON(!initialized);
704 mutex_lock(&debug_mutex);
705
706
707
708 rc = debug_info_create(name, pages_per_area, nr_areas, buf_size, mode);
709 if(!rc)
710 goto out;
711 debug_register_view(rc, &debug_level_view);
712 debug_register_view(rc, &debug_flush_view);
713 debug_register_view(rc, &debug_pages_view);
714out:
715 if (!rc){
716 pr_err("Registering debug feature %s failed\n", name);
717 }
718 mutex_unlock(&debug_mutex);
719 return rc;
720}
721EXPORT_SYMBOL(debug_register_mode);
722
723
724
725
726
727
728
729debug_info_t *debug_register(const char *name, int pages_per_area,
730 int nr_areas, int buf_size)
731{
732 return debug_register_mode(name, pages_per_area, nr_areas, buf_size,
733 S_IRUSR | S_IWUSR, 0, 0);
734}
735EXPORT_SYMBOL(debug_register);
736
737
738
739
740
741
742void
743debug_unregister(debug_info_t * id)
744{
745 if (!id)
746 goto out;
747 mutex_lock(&debug_mutex);
748 debug_info_put(id);
749 mutex_unlock(&debug_mutex);
750
751out:
752 return;
753}
754EXPORT_SYMBOL(debug_unregister);
755
756
757
758
759
760static int
761debug_set_size(debug_info_t* id, int nr_areas, int pages_per_area)
762{
763 unsigned long flags;
764 debug_entry_t *** new_areas;
765 int rc=0;
766
767 if(!id || (nr_areas <= 0) || (pages_per_area < 0))
768 return -EINVAL;
769 if(pages_per_area > 0){
770 new_areas = debug_areas_alloc(pages_per_area, nr_areas);
771 if(!new_areas) {
772 pr_info("Allocating memory for %i pages failed\n",
773 pages_per_area);
774 rc = -ENOMEM;
775 goto out;
776 }
777 } else {
778 new_areas = NULL;
779 }
780 spin_lock_irqsave(&id->lock,flags);
781 debug_areas_free(id);
782 id->areas = new_areas;
783 id->nr_areas = nr_areas;
784 id->pages_per_area = pages_per_area;
785 id->active_area = 0;
786 memset(id->active_entries,0,sizeof(int)*id->nr_areas);
787 memset(id->active_pages, 0, sizeof(int)*id->nr_areas);
788 spin_unlock_irqrestore(&id->lock,flags);
789 pr_info("%s: set new size (%i pages)\n" ,id->name, pages_per_area);
790out:
791 return rc;
792}
793
794
795
796
797
798
799void
800debug_set_level(debug_info_t* id, int new_level)
801{
802 unsigned long flags;
803 if(!id)
804 return;
805 spin_lock_irqsave(&id->lock,flags);
806 if(new_level == DEBUG_OFF_LEVEL){
807 id->level = DEBUG_OFF_LEVEL;
808 pr_info("%s: switched off\n",id->name);
809 } else if ((new_level > DEBUG_MAX_LEVEL) || (new_level < 0)) {
810 pr_info("%s: level %i is out of range (%i - %i)\n",
811 id->name, new_level, 0, DEBUG_MAX_LEVEL);
812 } else {
813 id->level = new_level;
814 }
815 spin_unlock_irqrestore(&id->lock,flags);
816}
817EXPORT_SYMBOL(debug_set_level);
818
819
820
821
822
823
824static inline void
825proceed_active_entry(debug_info_t * id)
826{
827 if ((id->active_entries[id->active_area] += id->entry_size)
828 > (PAGE_SIZE - id->entry_size)){
829 id->active_entries[id->active_area] = 0;
830 id->active_pages[id->active_area] =
831 (id->active_pages[id->active_area] + 1) %
832 id->pages_per_area;
833 }
834}
835
836
837
838
839
840
841static inline void
842proceed_active_area(debug_info_t * id)
843{
844 id->active_area++;
845 id->active_area = id->active_area % id->nr_areas;
846}
847
848
849
850
851
852static inline debug_entry_t*
853get_active_entry(debug_info_t * id)
854{
855 return (debug_entry_t *) (((char *) id->areas[id->active_area]
856 [id->active_pages[id->active_area]]) +
857 id->active_entries[id->active_area]);
858}
859
860
861
862
863
864
865static inline void
866debug_finish_entry(debug_info_t * id, debug_entry_t* active, int level,
867 int exception)
868{
869 active->id.stck = get_tod_clock_fast();
870 active->id.fields.cpuid = smp_processor_id();
871 active->caller = __builtin_return_address(0);
872 active->id.fields.exception = exception;
873 active->id.fields.level = level;
874 proceed_active_entry(id);
875 if(exception)
876 proceed_active_area(id);
877}
878
879static int debug_stoppable=1;
880static int debug_active=1;
881
882#define CTL_S390DBF_STOPPABLE 5678
883#define CTL_S390DBF_ACTIVE 5679
884
885
886
887
888
889
890static int
891s390dbf_procactive(struct ctl_table *table, int write,
892 void __user *buffer, size_t *lenp, loff_t *ppos)
893{
894 if (!write || debug_stoppable || !debug_active)
895 return proc_dointvec(table, write, buffer, lenp, ppos);
896 else
897 return 0;
898}
899
900
901static struct ctl_table s390dbf_table[] = {
902 {
903 .procname = "debug_stoppable",
904 .data = &debug_stoppable,
905 .maxlen = sizeof(int),
906 .mode = S_IRUGO | S_IWUSR,
907 .proc_handler = proc_dointvec,
908 },
909 {
910 .procname = "debug_active",
911 .data = &debug_active,
912 .maxlen = sizeof(int),
913 .mode = S_IRUGO | S_IWUSR,
914 .proc_handler = s390dbf_procactive,
915 },
916 { }
917};
918
919static struct ctl_table s390dbf_dir_table[] = {
920 {
921 .procname = "s390dbf",
922 .maxlen = 0,
923 .mode = S_IRUGO | S_IXUGO,
924 .child = s390dbf_table,
925 },
926 { }
927};
928
929static struct ctl_table_header *s390dbf_sysctl_header;
930
931void
932debug_stop_all(void)
933{
934 if (debug_stoppable)
935 debug_active = 0;
936}
937EXPORT_SYMBOL(debug_stop_all);
938
939void debug_set_critical(void)
940{
941 debug_critical = 1;
942}
943
944
945
946
947
948
949debug_entry_t*
950debug_event_common(debug_info_t * id, int level, const void *buf, int len)
951{
952 unsigned long flags;
953 debug_entry_t *active;
954
955 if (!debug_active || !id->areas)
956 return NULL;
957 if (debug_critical) {
958 if (!spin_trylock_irqsave(&id->lock, flags))
959 return NULL;
960 } else
961 spin_lock_irqsave(&id->lock, flags);
962 active = get_active_entry(id);
963 memset(DEBUG_DATA(active), 0, id->buf_size);
964 memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size));
965 debug_finish_entry(id, active, level, 0);
966 spin_unlock_irqrestore(&id->lock, flags);
967
968 return active;
969}
970EXPORT_SYMBOL(debug_event_common);
971
972
973
974
975
976
977debug_entry_t
978*debug_exception_common(debug_info_t * id, int level, const void *buf, int len)
979{
980 unsigned long flags;
981 debug_entry_t *active;
982
983 if (!debug_active || !id->areas)
984 return NULL;
985 if (debug_critical) {
986 if (!spin_trylock_irqsave(&id->lock, flags))
987 return NULL;
988 } else
989 spin_lock_irqsave(&id->lock, flags);
990 active = get_active_entry(id);
991 memset(DEBUG_DATA(active), 0, id->buf_size);
992 memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size));
993 debug_finish_entry(id, active, level, 1);
994 spin_unlock_irqrestore(&id->lock, flags);
995
996 return active;
997}
998EXPORT_SYMBOL(debug_exception_common);
999
1000
1001
1002
1003
1004static inline int
1005debug_count_numargs(char *string)
1006{
1007 int numargs=0;
1008
1009 while(*string) {
1010 if(*string++=='%')
1011 numargs++;
1012 }
1013 return(numargs);
1014}
1015
1016
1017
1018
1019
1020debug_entry_t*
1021__debug_sprintf_event(debug_info_t *id, int level, char *string, ...)
1022{
1023 va_list ap;
1024 int numargs,idx;
1025 unsigned long flags;
1026 debug_sprintf_entry_t *curr_event;
1027 debug_entry_t *active;
1028
1029 if (!debug_active || !id->areas)
1030 return NULL;
1031 numargs=debug_count_numargs(string);
1032
1033 if (debug_critical) {
1034 if (!spin_trylock_irqsave(&id->lock, flags))
1035 return NULL;
1036 } else
1037 spin_lock_irqsave(&id->lock, flags);
1038 active = get_active_entry(id);
1039 curr_event=(debug_sprintf_entry_t *) DEBUG_DATA(active);
1040 va_start(ap,string);
1041 curr_event->string=string;
1042 for(idx=0;idx<min(numargs,(int)(id->buf_size / sizeof(long))-1);idx++)
1043 curr_event->args[idx]=va_arg(ap,long);
1044 va_end(ap);
1045 debug_finish_entry(id, active, level, 0);
1046 spin_unlock_irqrestore(&id->lock, flags);
1047
1048 return active;
1049}
1050EXPORT_SYMBOL(__debug_sprintf_event);
1051
1052
1053
1054
1055
1056debug_entry_t*
1057__debug_sprintf_exception(debug_info_t *id, int level, char *string, ...)
1058{
1059 va_list ap;
1060 int numargs,idx;
1061 unsigned long flags;
1062 debug_sprintf_entry_t *curr_event;
1063 debug_entry_t *active;
1064
1065 if (!debug_active || !id->areas)
1066 return NULL;
1067
1068 numargs=debug_count_numargs(string);
1069
1070 if (debug_critical) {
1071 if (!spin_trylock_irqsave(&id->lock, flags))
1072 return NULL;
1073 } else
1074 spin_lock_irqsave(&id->lock, flags);
1075 active = get_active_entry(id);
1076 curr_event=(debug_sprintf_entry_t *)DEBUG_DATA(active);
1077 va_start(ap,string);
1078 curr_event->string=string;
1079 for(idx=0;idx<min(numargs,(int)(id->buf_size / sizeof(long))-1);idx++)
1080 curr_event->args[idx]=va_arg(ap,long);
1081 va_end(ap);
1082 debug_finish_entry(id, active, level, 1);
1083 spin_unlock_irqrestore(&id->lock, flags);
1084
1085 return active;
1086}
1087EXPORT_SYMBOL(__debug_sprintf_exception);
1088
1089
1090
1091
1092
1093int
1094debug_register_view(debug_info_t * id, struct debug_view *view)
1095{
1096 int rc = 0;
1097 int i;
1098 unsigned long flags;
1099 umode_t mode;
1100 struct dentry *pde;
1101
1102 if (!id)
1103 goto out;
1104 mode = (id->mode | S_IFREG) & ~S_IXUGO;
1105 if (!(view->prolog_proc || view->format_proc || view->header_proc))
1106 mode &= ~(S_IRUSR | S_IRGRP | S_IROTH);
1107 if (!view->input_proc)
1108 mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
1109 pde = debugfs_create_file(view->name, mode, id->debugfs_root_entry,
1110 id , &debug_file_ops);
1111 if (!pde){
1112 pr_err("Registering view %s/%s failed due to out of "
1113 "memory\n", id->name,view->name);
1114 rc = -1;
1115 goto out;
1116 }
1117 spin_lock_irqsave(&id->lock, flags);
1118 for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
1119 if (!id->views[i])
1120 break;
1121 }
1122 if (i == DEBUG_MAX_VIEWS) {
1123 pr_err("Registering view %s/%s would exceed the maximum "
1124 "number of views %i\n", id->name, view->name, i);
1125 rc = -1;
1126 } else {
1127 id->views[i] = view;
1128 id->debugfs_entries[i] = pde;
1129 }
1130 spin_unlock_irqrestore(&id->lock, flags);
1131 if (rc)
1132 debugfs_remove(pde);
1133out:
1134 return rc;
1135}
1136EXPORT_SYMBOL(debug_register_view);
1137
1138
1139
1140
1141
1142int
1143debug_unregister_view(debug_info_t * id, struct debug_view *view)
1144{
1145 struct dentry *dentry = NULL;
1146 unsigned long flags;
1147 int i, rc = 0;
1148
1149 if (!id)
1150 goto out;
1151 spin_lock_irqsave(&id->lock, flags);
1152 for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
1153 if (id->views[i] == view)
1154 break;
1155 }
1156 if (i == DEBUG_MAX_VIEWS)
1157 rc = -1;
1158 else {
1159 dentry = id->debugfs_entries[i];
1160 id->views[i] = NULL;
1161 id->debugfs_entries[i] = NULL;
1162 }
1163 spin_unlock_irqrestore(&id->lock, flags);
1164 debugfs_remove(dentry);
1165out:
1166 return rc;
1167}
1168EXPORT_SYMBOL(debug_unregister_view);
1169
1170static inline char *
1171debug_get_user_string(const char __user *user_buf, size_t user_len)
1172{
1173 char* buffer;
1174
1175 buffer = kmalloc(user_len + 1, GFP_KERNEL);
1176 if (!buffer)
1177 return ERR_PTR(-ENOMEM);
1178 if (copy_from_user(buffer, user_buf, user_len) != 0) {
1179 kfree(buffer);
1180 return ERR_PTR(-EFAULT);
1181 }
1182
1183 if (buffer[user_len - 1] == '\n')
1184 buffer[user_len - 1] = 0;
1185 else
1186 buffer[user_len] = 0;
1187 return buffer;
1188}
1189
1190static inline int
1191debug_get_uint(char *buf)
1192{
1193 int rc;
1194
1195 buf = skip_spaces(buf);
1196 rc = simple_strtoul(buf, &buf, 10);
1197 if(*buf){
1198 rc = -EINVAL;
1199 }
1200 return rc;
1201}
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212static int
1213debug_prolog_pages_fn(debug_info_t * id,
1214 struct debug_view *view, char *out_buf)
1215{
1216 return sprintf(out_buf, "%i\n", id->pages_per_area);
1217}
1218
1219
1220
1221
1222
1223static int
1224debug_input_pages_fn(debug_info_t * id, struct debug_view *view,
1225 struct file *file, const char __user *user_buf,
1226 size_t user_len, loff_t * offset)
1227{
1228 char *str;
1229 int rc,new_pages;
1230
1231 if (user_len > 0x10000)
1232 user_len = 0x10000;
1233 if (*offset != 0){
1234 rc = -EPIPE;
1235 goto out;
1236 }
1237 str = debug_get_user_string(user_buf,user_len);
1238 if(IS_ERR(str)){
1239 rc = PTR_ERR(str);
1240 goto out;
1241 }
1242 new_pages = debug_get_uint(str);
1243 if(new_pages < 0){
1244 rc = -EINVAL;
1245 goto free_str;
1246 }
1247 rc = debug_set_size(id,id->nr_areas, new_pages);
1248 if(rc != 0){
1249 rc = -EINVAL;
1250 goto free_str;
1251 }
1252 rc = user_len;
1253free_str:
1254 kfree(str);
1255out:
1256 *offset += user_len;
1257 return rc;
1258}
1259
1260
1261
1262
1263
1264static int
1265debug_prolog_level_fn(debug_info_t * id, struct debug_view *view, char *out_buf)
1266{
1267 int rc = 0;
1268
1269 if(id->level == DEBUG_OFF_LEVEL) {
1270 rc = sprintf(out_buf,"-\n");
1271 }
1272 else {
1273 rc = sprintf(out_buf, "%i\n", id->level);
1274 }
1275 return rc;
1276}
1277
1278
1279
1280
1281
1282static int
1283debug_input_level_fn(debug_info_t * id, struct debug_view *view,
1284 struct file *file, const char __user *user_buf,
1285 size_t user_len, loff_t * offset)
1286{
1287 char *str;
1288 int rc,new_level;
1289
1290 if (user_len > 0x10000)
1291 user_len = 0x10000;
1292 if (*offset != 0){
1293 rc = -EPIPE;
1294 goto out;
1295 }
1296 str = debug_get_user_string(user_buf,user_len);
1297 if(IS_ERR(str)){
1298 rc = PTR_ERR(str);
1299 goto out;
1300 }
1301 if(str[0] == '-'){
1302 debug_set_level(id, DEBUG_OFF_LEVEL);
1303 rc = user_len;
1304 goto free_str;
1305 } else {
1306 new_level = debug_get_uint(str);
1307 }
1308 if(new_level < 0) {
1309 pr_warn("%s is not a valid level for a debug feature\n", str);
1310 rc = -EINVAL;
1311 } else {
1312 debug_set_level(id, new_level);
1313 rc = user_len;
1314 }
1315free_str:
1316 kfree(str);
1317out:
1318 *offset += user_len;
1319 return rc;
1320}
1321
1322
1323
1324
1325
1326
1327static void debug_flush(debug_info_t* id, int area)
1328{
1329 unsigned long flags;
1330 int i,j;
1331
1332 if(!id || !id->areas)
1333 return;
1334 spin_lock_irqsave(&id->lock,flags);
1335 if(area == DEBUG_FLUSH_ALL){
1336 id->active_area = 0;
1337 memset(id->active_entries, 0, id->nr_areas * sizeof(int));
1338 for (i = 0; i < id->nr_areas; i++) {
1339 id->active_pages[i] = 0;
1340 for(j = 0; j < id->pages_per_area; j++) {
1341 memset(id->areas[i][j], 0, PAGE_SIZE);
1342 }
1343 }
1344 } else if(area >= 0 && area < id->nr_areas) {
1345 id->active_entries[area] = 0;
1346 id->active_pages[area] = 0;
1347 for(i = 0; i < id->pages_per_area; i++) {
1348 memset(id->areas[area][i],0,PAGE_SIZE);
1349 }
1350 }
1351 spin_unlock_irqrestore(&id->lock,flags);
1352}
1353
1354
1355
1356
1357
1358static int
1359debug_input_flush_fn(debug_info_t * id, struct debug_view *view,
1360 struct file *file, const char __user *user_buf,
1361 size_t user_len, loff_t * offset)
1362{
1363 char input_buf[1];
1364 int rc = user_len;
1365
1366 if (user_len > 0x10000)
1367 user_len = 0x10000;
1368 if (*offset != 0){
1369 rc = -EPIPE;
1370 goto out;
1371 }
1372 if (copy_from_user(input_buf, user_buf, 1)){
1373 rc = -EFAULT;
1374 goto out;
1375 }
1376 if(input_buf[0] == '-') {
1377 debug_flush(id, DEBUG_FLUSH_ALL);
1378 goto out;
1379 }
1380 if (isdigit(input_buf[0])) {
1381 int area = ((int) input_buf[0] - (int) '0');
1382 debug_flush(id, area);
1383 goto out;
1384 }
1385
1386 pr_info("Flushing debug data failed because %c is not a valid "
1387 "area\n", input_buf[0]);
1388
1389out:
1390 *offset += user_len;
1391 return rc;
1392}
1393
1394
1395
1396
1397
1398static int
1399debug_raw_header_fn(debug_info_t * id, struct debug_view *view,
1400 int area, debug_entry_t * entry, char *out_buf)
1401{
1402 int rc;
1403
1404 rc = sizeof(debug_entry_t);
1405 memcpy(out_buf,entry,sizeof(debug_entry_t));
1406 return rc;
1407}
1408
1409
1410
1411
1412
1413static int
1414debug_raw_format_fn(debug_info_t * id, struct debug_view *view,
1415 char *out_buf, const char *in_buf)
1416{
1417 int rc;
1418
1419 rc = id->buf_size;
1420 memcpy(out_buf, in_buf, id->buf_size);
1421 return rc;
1422}
1423
1424
1425
1426
1427
1428static int
1429debug_hex_ascii_format_fn(debug_info_t * id, struct debug_view *view,
1430 char *out_buf, const char *in_buf)
1431{
1432 int i, rc = 0;
1433
1434 for (i = 0; i < id->buf_size; i++) {
1435 rc += sprintf(out_buf + rc, "%02x ",
1436 ((unsigned char *) in_buf)[i]);
1437 }
1438 rc += sprintf(out_buf + rc, "| ");
1439 for (i = 0; i < id->buf_size; i++) {
1440 unsigned char c = in_buf[i];
1441 if (isascii(c) && isprint(c))
1442 rc += sprintf(out_buf + rc, "%c", c);
1443 else
1444 rc += sprintf(out_buf + rc, ".");
1445 }
1446 rc += sprintf(out_buf + rc, "\n");
1447 return rc;
1448}
1449
1450
1451
1452
1453
1454int
1455debug_dflt_header_fn(debug_info_t * id, struct debug_view *view,
1456 int area, debug_entry_t * entry, char *out_buf)
1457{
1458 struct timespec64 time_spec;
1459 char *except_str;
1460 unsigned long caller;
1461 int rc = 0;
1462 unsigned int level;
1463
1464 level = entry->id.fields.level;
1465 stck_to_timespec64(entry->id.stck, &time_spec);
1466
1467 if (entry->id.fields.exception)
1468 except_str = "*";
1469 else
1470 except_str = "-";
1471 caller = (unsigned long) entry->caller;
1472 rc += sprintf(out_buf, "%02i %011lld:%06lu %1u %1s %02i %p ",
1473 area, (long long)time_spec.tv_sec,
1474 time_spec.tv_nsec / 1000, level, except_str,
1475 entry->id.fields.cpuid, (void *)caller);
1476 return rc;
1477}
1478EXPORT_SYMBOL(debug_dflt_header_fn);
1479
1480
1481
1482
1483
1484
1485#define DEBUG_SPRINTF_MAX_ARGS 10
1486
1487static int
1488debug_sprintf_format_fn(debug_info_t * id, struct debug_view *view,
1489 char *out_buf, debug_sprintf_entry_t *curr_event)
1490{
1491 int num_longs, num_used_args = 0,i, rc = 0;
1492 int index[DEBUG_SPRINTF_MAX_ARGS];
1493
1494
1495 num_longs = id->buf_size / sizeof(long);
1496
1497 if(num_longs < 1)
1498 goto out;
1499 if(num_longs == 1) {
1500
1501 strcpy(out_buf, curr_event->string);
1502 rc = strlen(curr_event->string);
1503 goto out;
1504 }
1505
1506
1507 num_used_args = min(DEBUG_SPRINTF_MAX_ARGS, (num_longs - 1));
1508
1509 memset(index,0, DEBUG_SPRINTF_MAX_ARGS * sizeof(int));
1510
1511 for(i = 0; i < num_used_args; i++)
1512 index[i] = i;
1513
1514 rc = sprintf(out_buf, curr_event->string, curr_event->args[index[0]],
1515 curr_event->args[index[1]], curr_event->args[index[2]],
1516 curr_event->args[index[3]], curr_event->args[index[4]],
1517 curr_event->args[index[5]], curr_event->args[index[6]],
1518 curr_event->args[index[7]], curr_event->args[index[8]],
1519 curr_event->args[index[9]]);
1520
1521out:
1522
1523 return rc;
1524}
1525
1526
1527
1528
1529
1530static int __init debug_init(void)
1531{
1532 s390dbf_sysctl_header = register_sysctl_table(s390dbf_dir_table);
1533 mutex_lock(&debug_mutex);
1534 debug_debugfs_root_entry = debugfs_create_dir(DEBUG_DIR_ROOT, NULL);
1535 initialized = 1;
1536 mutex_unlock(&debug_mutex);
1537 return 0;
1538}
1539postcore_initcall(debug_init);
1540
