1
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5
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10
11
12
13#define KMSG_COMPONENT "s390dbf"
14#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
15
16#include <linux/stddef.h>
17#include <linux/kernel.h>
18#include <linux/errno.h>
19#include <linux/slab.h>
20#include <linux/ctype.h>
21#include <linux/string.h>
22#include <linux/sysctl.h>
23#include <linux/uaccess.h>
24#include <linux/export.h>
25#include <linux/init.h>
26#include <linux/fs.h>
27#include <linux/debugfs.h>
28
29#include <asm/debug.h>
30
31#define DEBUG_PROLOG_ENTRY -1
32
33#define ALL_AREAS 0
34#define NO_AREAS 1
35
36
37
38typedef struct file_private_info {
39 loff_t offset;
40 int act_area;
41 int act_page;
42 int act_entry;
43
44
45 size_t act_entry_offset;
46
47
48 char temp_buf[2048];
49 debug_info_t *debug_info_org;
50 debug_info_t *debug_info_snap;
51 struct debug_view *view;
52} file_private_info_t;
53
54typedef struct {
55 char *string;
56
57
58
59
60
61
62 long args[0];
63} debug_sprintf_entry_t;
64
65
66
67static int debug_init(void);
68static ssize_t debug_output(struct file *file, char __user *user_buf,
69 size_t user_len, loff_t *offset);
70static ssize_t debug_input(struct file *file, const char __user *user_buf,
71 size_t user_len, loff_t *offset);
72static int debug_open(struct inode *inode, struct file *file);
73static int debug_close(struct inode *inode, struct file *file);
74static debug_info_t *debug_info_create(const char *name, int pages_per_area,
75 int nr_areas, int buf_size, umode_t mode);
76static void debug_info_get(debug_info_t *);
77static void debug_info_put(debug_info_t *);
78static int debug_prolog_level_fn(debug_info_t *id,
79 struct debug_view *view, char *out_buf);
80static 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);
83static int debug_prolog_pages_fn(debug_info_t *id,
84 struct debug_view *view, char *out_buf);
85static 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);
88static 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);
91static int debug_hex_ascii_format_fn(debug_info_t *id, struct debug_view *view,
92 char *out_buf, const char *in_buf);
93static int debug_raw_format_fn(debug_info_t *id,
94 struct debug_view *view, char *out_buf,
95 const char *in_buf);
96static int debug_raw_header_fn(debug_info_t *id, struct debug_view *view,
97 int area, debug_entry_t *entry, char *out_buf);
98
99static 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
103
104struct debug_view debug_raw_view = {
105 "raw",
106 NULL,
107 &debug_raw_header_fn,
108 &debug_raw_format_fn,
109 NULL,
110 NULL
111};
112EXPORT_SYMBOL(debug_raw_view);
113
114struct debug_view debug_hex_ascii_view = {
115 "hex_ascii",
116 NULL,
117 &debug_dflt_header_fn,
118 &debug_hex_ascii_format_fn,
119 NULL,
120 NULL
121};
122EXPORT_SYMBOL(debug_hex_ascii_view);
123
124static struct debug_view debug_level_view = {
125 "level",
126 &debug_prolog_level_fn,
127 NULL,
128 NULL,
129 &debug_input_level_fn,
130 NULL
131};
132
133static struct debug_view debug_pages_view = {
134 "pages",
135 &debug_prolog_pages_fn,
136 NULL,
137 NULL,
138 &debug_input_pages_fn,
139 NULL
140};
141
142static struct debug_view debug_flush_view = {
143 "flush",
144 NULL,
145 NULL,
146 NULL,
147 &debug_input_flush_fn,
148 NULL
149};
150
151struct debug_view debug_sprintf_view = {
152 "sprintf",
153 NULL,
154 &debug_dflt_header_fn,
155 (debug_format_proc_t *)&debug_sprintf_format_fn,
156 NULL,
157 NULL
158};
159EXPORT_SYMBOL(debug_sprintf_view);
160
161
162static unsigned int __used debug_feature_version = __DEBUG_FEATURE_VERSION;
163
164
165
166static debug_info_t *debug_area_first;
167static debug_info_t *debug_area_last;
168static DEFINE_MUTEX(debug_mutex);
169
170static int initialized;
171static int debug_critical;
172
173static const struct file_operations debug_file_ops = {
174 .owner = THIS_MODULE,
175 .read = debug_output,
176 .write = debug_input,
177 .open = debug_open,
178 .release = debug_close,
179 .llseek = no_llseek,
180};
181
182static struct dentry *debug_debugfs_root_entry;
183
184
185
186
187
188
189
190
191
192static debug_entry_t ***debug_areas_alloc(int pages_per_area, int nr_areas)
193{
194 debug_entry_t ***areas;
195 int i, j;
196
197 areas = kmalloc_array(nr_areas, sizeof(debug_entry_t **), GFP_KERNEL);
198 if (!areas)
199 goto fail_malloc_areas;
200 for (i = 0; i < nr_areas; i++) {
201 areas[i] = kmalloc_array(pages_per_area,
202 sizeof(debug_entry_t *),
203 GFP_KERNEL);
204 if (!areas[i])
205 goto fail_malloc_areas2;
206 for (j = 0; j < pages_per_area; j++) {
207 areas[i][j] = kzalloc(PAGE_SIZE, GFP_KERNEL);
208 if (!areas[i][j]) {
209 for (j--; j >= 0 ; j--)
210 kfree(areas[i][j]);
211 kfree(areas[i]);
212 goto fail_malloc_areas2;
213 }
214 }
215 }
216 return areas;
217
218fail_malloc_areas2:
219 for (i--; i >= 0; i--) {
220 for (j = 0; j < pages_per_area; j++)
221 kfree(areas[i][j]);
222 kfree(areas[i]);
223 }
224 kfree(areas);
225fail_malloc_areas:
226 return NULL;
227}
228
229
230
231
232
233static debug_info_t *debug_info_alloc(const char *name, int pages_per_area,
234 int nr_areas, int buf_size, int level,
235 int mode)
236{
237 debug_info_t *rc;
238
239
240 rc = kmalloc(sizeof(debug_info_t), GFP_KERNEL);
241 if (!rc)
242 goto fail_malloc_rc;
243 rc->active_entries = kcalloc(nr_areas, sizeof(int), GFP_KERNEL);
244 if (!rc->active_entries)
245 goto fail_malloc_active_entries;
246 rc->active_pages = kcalloc(nr_areas, sizeof(int), GFP_KERNEL);
247 if (!rc->active_pages)
248 goto fail_malloc_active_pages;
249 if ((mode == ALL_AREAS) && (pages_per_area != 0)) {
250 rc->areas = debug_areas_alloc(pages_per_area, nr_areas);
251 if (!rc->areas)
252 goto fail_malloc_areas;
253 } else {
254 rc->areas = NULL;
255 }
256
257
258 spin_lock_init(&rc->lock);
259 rc->pages_per_area = pages_per_area;
260 rc->nr_areas = nr_areas;
261 rc->active_area = 0;
262 rc->level = level;
263 rc->buf_size = buf_size;
264 rc->entry_size = sizeof(debug_entry_t) + buf_size;
265 strlcpy(rc->name, name, sizeof(rc->name));
266 memset(rc->views, 0, DEBUG_MAX_VIEWS * sizeof(struct debug_view *));
267 memset(rc->debugfs_entries, 0, DEBUG_MAX_VIEWS * sizeof(struct dentry *));
268 refcount_set(&(rc->ref_count), 0);
269
270 return rc;
271
272fail_malloc_areas:
273 kfree(rc->active_pages);
274fail_malloc_active_pages:
275 kfree(rc->active_entries);
276fail_malloc_active_entries:
277 kfree(rc);
278fail_malloc_rc:
279 return NULL;
280}
281
282
283
284
285
286static void debug_areas_free(debug_info_t *db_info)
287{
288 int i, j;
289
290 if (!db_info->areas)
291 return;
292 for (i = 0; i < db_info->nr_areas; i++) {
293 for (j = 0; j < db_info->pages_per_area; j++)
294 kfree(db_info->areas[i][j]);
295 kfree(db_info->areas[i]);
296 }
297 kfree(db_info->areas);
298 db_info->areas = NULL;
299}
300
301
302
303
304
305static void debug_info_free(debug_info_t *db_info)
306{
307 debug_areas_free(db_info);
308 kfree(db_info->active_entries);
309 kfree(db_info->active_pages);
310 kfree(db_info);
311}
312
313
314
315
316
317
318static debug_info_t *debug_info_create(const char *name, int pages_per_area,
319 int nr_areas, int buf_size, umode_t mode)
320{
321 debug_info_t *rc;
322
323 rc = debug_info_alloc(name, pages_per_area, nr_areas, buf_size,
324 DEBUG_DEFAULT_LEVEL, ALL_AREAS);
325 if (!rc)
326 goto out;
327
328 rc->mode = mode & ~S_IFMT;
329
330
331 rc->debugfs_root_entry = debugfs_create_dir(rc->name,
332 debug_debugfs_root_entry);
333
334
335 if (!debug_area_first) {
336
337 debug_area_first = rc;
338 rc->prev = NULL;
339 } else {
340
341 debug_area_last->next = rc;
342 rc->prev = debug_area_last;
343 }
344 debug_area_last = rc;
345 rc->next = NULL;
346
347 refcount_set(&rc->ref_count, 1);
348out:
349 return rc;
350}
351
352
353
354
355
356static debug_info_t *debug_info_copy(debug_info_t *in, int mode)
357{
358 unsigned long flags;
359 debug_info_t *rc;
360 int i, j;
361
362
363 do {
364 rc = debug_info_alloc(in->name, in->pages_per_area,
365 in->nr_areas, in->buf_size, in->level, mode);
366 spin_lock_irqsave(&in->lock, flags);
367 if (!rc)
368 goto out;
369
370 if ((rc->pages_per_area == in->pages_per_area) &&
371 (rc->nr_areas == in->nr_areas)) {
372 break;
373 }
374 spin_unlock_irqrestore(&in->lock, flags);
375 debug_info_free(rc);
376 } while (1);
377
378 if (mode == NO_AREAS)
379 goto out;
380
381 for (i = 0; i < in->nr_areas; i++) {
382 for (j = 0; j < in->pages_per_area; j++)
383 memcpy(rc->areas[i][j], in->areas[i][j], PAGE_SIZE);
384 }
385out:
386 spin_unlock_irqrestore(&in->lock, flags);
387 return rc;
388}
389
390
391
392
393
394static void debug_info_get(debug_info_t *db_info)
395{
396 if (db_info)
397 refcount_inc(&db_info->ref_count);
398}
399
400
401
402
403
404static void debug_info_put(debug_info_t *db_info)
405{
406 int i;
407
408 if (!db_info)
409 return;
410 if (refcount_dec_and_test(&db_info->ref_count)) {
411 for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
412 if (!db_info->views[i])
413 continue;
414 debugfs_remove(db_info->debugfs_entries[i]);
415 }
416 debugfs_remove(db_info->debugfs_root_entry);
417 if (db_info == debug_area_first)
418 debug_area_first = db_info->next;
419 if (db_info == debug_area_last)
420 debug_area_last = db_info->prev;
421 if (db_info->prev)
422 db_info->prev->next = db_info->next;
423 if (db_info->next)
424 db_info->next->prev = db_info->prev;
425 debug_info_free(db_info);
426 }
427}
428
429
430
431
432
433static int debug_format_entry(file_private_info_t *p_info)
434{
435 debug_info_t *id_snap = p_info->debug_info_snap;
436 struct debug_view *view = p_info->view;
437 debug_entry_t *act_entry;
438 size_t len = 0;
439
440 if (p_info->act_entry == DEBUG_PROLOG_ENTRY) {
441
442 if (view->prolog_proc)
443 len += view->prolog_proc(id_snap, view, p_info->temp_buf);
444 goto out;
445 }
446 if (!id_snap->areas)
447 goto out;
448 act_entry = (debug_entry_t *) ((char *)id_snap->areas[p_info->act_area]
449 [p_info->act_page] + p_info->act_entry);
450
451 if (act_entry->id.stck == 0LL)
452 goto out;
453 if (view->header_proc)
454 len += view->header_proc(id_snap, view, p_info->act_area,
455 act_entry, p_info->temp_buf + len);
456 if (view->format_proc)
457 len += view->format_proc(id_snap, view, p_info->temp_buf + len,
458 DEBUG_DATA(act_entry));
459out:
460 return len;
461}
462
463
464
465
466
467static inline int debug_next_entry(file_private_info_t *p_info)
468{
469 debug_info_t *id;
470
471 id = p_info->debug_info_snap;
472 if (p_info->act_entry == DEBUG_PROLOG_ENTRY) {
473 p_info->act_entry = 0;
474 p_info->act_page = 0;
475 goto out;
476 }
477 if (!id->areas)
478 return 1;
479 p_info->act_entry += id->entry_size;
480
481 if (p_info->act_entry > (PAGE_SIZE - id->entry_size)) {
482
483 p_info->act_entry = 0;
484 p_info->act_page += 1;
485 if ((p_info->act_page % id->pages_per_area) == 0) {
486
487 p_info->act_area++;
488 p_info->act_page = 0;
489 }
490 if (p_info->act_area >= id->nr_areas)
491 return 1;
492 }
493out:
494 return 0;
495}
496
497
498
499
500
501
502static ssize_t debug_output(struct file *file,
503 char __user *user_buf,
504 size_t len,
505 loff_t *offset)
506{
507 size_t count = 0;
508 size_t entry_offset;
509 file_private_info_t *p_info;
510
511 p_info = (file_private_info_t *) file->private_data;
512 if (*offset != p_info->offset)
513 return -EPIPE;
514 if (p_info->act_area >= p_info->debug_info_snap->nr_areas)
515 return 0;
516 entry_offset = p_info->act_entry_offset;
517 while (count < len) {
518 int formatted_line_residue;
519 int formatted_line_size;
520 int user_buf_residue;
521 size_t copy_size;
522
523 formatted_line_size = debug_format_entry(p_info);
524 formatted_line_residue = formatted_line_size - entry_offset;
525 user_buf_residue = len-count;
526 copy_size = min(user_buf_residue, formatted_line_residue);
527 if (copy_size) {
528 if (copy_to_user(user_buf + count, p_info->temp_buf
529 + entry_offset, copy_size))
530 return -EFAULT;
531 count += copy_size;
532 entry_offset += copy_size;
533 }
534 if (copy_size == formatted_line_residue) {
535 entry_offset = 0;
536 if (debug_next_entry(p_info))
537 goto out;
538 }
539 }
540out:
541 p_info->offset = *offset + count;
542 p_info->act_entry_offset = entry_offset;
543 *offset = p_info->offset;
544 return count;
545}
546
547
548
549
550
551
552static ssize_t debug_input(struct file *file, const char __user *user_buf,
553 size_t length, loff_t *offset)
554{
555 file_private_info_t *p_info;
556 int rc = 0;
557
558 mutex_lock(&debug_mutex);
559 p_info = ((file_private_info_t *) file->private_data);
560 if (p_info->view->input_proc) {
561 rc = p_info->view->input_proc(p_info->debug_info_org,
562 p_info->view, file, user_buf,
563 length, offset);
564 } else {
565 rc = -EPERM;
566 }
567 mutex_unlock(&debug_mutex);
568 return rc;
569}
570
571
572
573
574
575
576
577static int debug_open(struct inode *inode, struct file *file)
578{
579 debug_info_t *debug_info, *debug_info_snapshot;
580 file_private_info_t *p_info;
581 int i, rc = 0;
582
583 mutex_lock(&debug_mutex);
584 debug_info = file_inode(file)->i_private;
585
586 for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
587 if (!debug_info->views[i])
588 continue;
589 else if (debug_info->debugfs_entries[i] == file->f_path.dentry)
590 goto found;
591 }
592
593 rc = -EINVAL;
594 goto out;
595
596found:
597
598
599
600
601
602 if (!debug_info->views[i]->format_proc && !debug_info->views[i]->header_proc)
603 debug_info_snapshot = debug_info_copy(debug_info, NO_AREAS);
604 else
605 debug_info_snapshot = debug_info_copy(debug_info, ALL_AREAS);
606
607 if (!debug_info_snapshot) {
608 rc = -ENOMEM;
609 goto out;
610 }
611 p_info = kmalloc(sizeof(file_private_info_t), GFP_KERNEL);
612 if (!p_info) {
613 debug_info_free(debug_info_snapshot);
614 rc = -ENOMEM;
615 goto out;
616 }
617 p_info->offset = 0;
618 p_info->debug_info_snap = debug_info_snapshot;
619 p_info->debug_info_org = debug_info;
620 p_info->view = debug_info->views[i];
621 p_info->act_area = 0;
622 p_info->act_page = 0;
623 p_info->act_entry = DEBUG_PROLOG_ENTRY;
624 p_info->act_entry_offset = 0;
625 file->private_data = p_info;
626 debug_info_get(debug_info);
627 nonseekable_open(inode, file);
628out:
629 mutex_unlock(&debug_mutex);
630 return rc;
631}
632
633
634
635
636
637
638static int debug_close(struct inode *inode, struct file *file)
639{
640 file_private_info_t *p_info;
641
642 p_info = (file_private_info_t *) file->private_data;
643 if (p_info->debug_info_snap)
644 debug_info_free(p_info->debug_info_snap);
645 debug_info_put(p_info->debug_info_org);
646 kfree(file->private_data);
647 return 0;
648}
649
650
651
652
653
654
655
656debug_info_t *debug_register_mode(const char *name, int pages_per_area,
657 int nr_areas, int buf_size, umode_t mode,
658 uid_t uid, gid_t gid)
659{
660 debug_info_t *rc = NULL;
661
662
663
664 if ((uid != 0) || (gid != 0))
665 pr_warn("Root becomes the owner of all s390dbf files in sysfs\n");
666 BUG_ON(!initialized);
667 mutex_lock(&debug_mutex);
668
669
670 rc = debug_info_create(name, pages_per_area, nr_areas, buf_size, mode);
671 if (!rc)
672 goto out;
673 debug_register_view(rc, &debug_level_view);
674 debug_register_view(rc, &debug_flush_view);
675 debug_register_view(rc, &debug_pages_view);
676out:
677 if (!rc)
678 pr_err("Registering debug feature %s failed\n", name);
679 mutex_unlock(&debug_mutex);
680 return rc;
681}
682EXPORT_SYMBOL(debug_register_mode);
683
684
685
686
687
688
689debug_info_t *debug_register(const char *name, int pages_per_area,
690 int nr_areas, int buf_size)
691{
692 return debug_register_mode(name, pages_per_area, nr_areas, buf_size,
693 S_IRUSR | S_IWUSR, 0, 0);
694}
695EXPORT_SYMBOL(debug_register);
696
697
698
699
700
701void debug_unregister(debug_info_t *id)
702{
703 if (!id)
704 return;
705 mutex_lock(&debug_mutex);
706 debug_info_put(id);
707 mutex_unlock(&debug_mutex);
708}
709EXPORT_SYMBOL(debug_unregister);
710
711
712
713
714
715static int debug_set_size(debug_info_t *id, int nr_areas, int pages_per_area)
716{
717 debug_entry_t ***new_areas;
718 unsigned long flags;
719 int rc = 0;
720
721 if (!id || (nr_areas <= 0) || (pages_per_area < 0))
722 return -EINVAL;
723 if (pages_per_area > 0) {
724 new_areas = debug_areas_alloc(pages_per_area, nr_areas);
725 if (!new_areas) {
726 pr_info("Allocating memory for %i pages failed\n",
727 pages_per_area);
728 rc = -ENOMEM;
729 goto out;
730 }
731 } else {
732 new_areas = NULL;
733 }
734 spin_lock_irqsave(&id->lock, flags);
735 debug_areas_free(id);
736 id->areas = new_areas;
737 id->nr_areas = nr_areas;
738 id->pages_per_area = pages_per_area;
739 id->active_area = 0;
740 memset(id->active_entries, 0, sizeof(int)*id->nr_areas);
741 memset(id->active_pages, 0, sizeof(int)*id->nr_areas);
742 spin_unlock_irqrestore(&id->lock, flags);
743 pr_info("%s: set new size (%i pages)\n", id->name, pages_per_area);
744out:
745 return rc;
746}
747
748
749
750
751
752void debug_set_level(debug_info_t *id, int new_level)
753{
754 unsigned long flags;
755
756 if (!id)
757 return;
758 spin_lock_irqsave(&id->lock, flags);
759 if (new_level == DEBUG_OFF_LEVEL) {
760 id->level = DEBUG_OFF_LEVEL;
761 pr_info("%s: switched off\n", id->name);
762 } else if ((new_level > DEBUG_MAX_LEVEL) || (new_level < 0)) {
763 pr_info("%s: level %i is out of range (%i - %i)\n",
764 id->name, new_level, 0, DEBUG_MAX_LEVEL);
765 } else {
766 id->level = new_level;
767 }
768 spin_unlock_irqrestore(&id->lock, flags);
769}
770EXPORT_SYMBOL(debug_set_level);
771
772
773
774
775
776static inline void proceed_active_entry(debug_info_t *id)
777{
778 if ((id->active_entries[id->active_area] += id->entry_size)
779 > (PAGE_SIZE - id->entry_size)) {
780 id->active_entries[id->active_area] = 0;
781 id->active_pages[id->active_area] =
782 (id->active_pages[id->active_area] + 1) %
783 id->pages_per_area;
784 }
785}
786
787
788
789
790
791static inline void proceed_active_area(debug_info_t *id)
792{
793 id->active_area++;
794 id->active_area = id->active_area % id->nr_areas;
795}
796
797
798
799
800static inline debug_entry_t *get_active_entry(debug_info_t *id)
801{
802 return (debug_entry_t *) (((char *) id->areas[id->active_area]
803 [id->active_pages[id->active_area]]) +
804 id->active_entries[id->active_area]);
805}
806
807
808
809
810
811
812static inline void debug_finish_entry(debug_info_t *id, debug_entry_t *active,
813 int level, int exception)
814{
815 active->id.stck = get_tod_clock_fast() -
816 *(unsigned long long *) &tod_clock_base[1];
817 active->id.fields.cpuid = smp_processor_id();
818 active->caller = __builtin_return_address(0);
819 active->id.fields.exception = exception;
820 active->id.fields.level = level;
821 proceed_active_entry(id);
822 if (exception)
823 proceed_active_area(id);
824}
825
826static int debug_stoppable = 1;
827static int debug_active = 1;
828
829#define CTL_S390DBF_STOPPABLE 5678
830#define CTL_S390DBF_ACTIVE 5679
831
832
833
834
835
836
837static int s390dbf_procactive(struct ctl_table *table, int write,
838 void __user *buffer, size_t *lenp, loff_t *ppos)
839{
840 if (!write || debug_stoppable || !debug_active)
841 return proc_dointvec(table, write, buffer, lenp, ppos);
842 else
843 return 0;
844}
845
846static struct ctl_table s390dbf_table[] = {
847 {
848 .procname = "debug_stoppable",
849 .data = &debug_stoppable,
850 .maxlen = sizeof(int),
851 .mode = S_IRUGO | S_IWUSR,
852 .proc_handler = proc_dointvec,
853 },
854 {
855 .procname = "debug_active",
856 .data = &debug_active,
857 .maxlen = sizeof(int),
858 .mode = S_IRUGO | S_IWUSR,
859 .proc_handler = s390dbf_procactive,
860 },
861 { }
862};
863
864static struct ctl_table s390dbf_dir_table[] = {
865 {
866 .procname = "s390dbf",
867 .maxlen = 0,
868 .mode = S_IRUGO | S_IXUGO,
869 .child = s390dbf_table,
870 },
871 { }
872};
873
874static struct ctl_table_header *s390dbf_sysctl_header;
875
876void debug_stop_all(void)
877{
878 if (debug_stoppable)
879 debug_active = 0;
880}
881EXPORT_SYMBOL(debug_stop_all);
882
883void debug_set_critical(void)
884{
885 debug_critical = 1;
886}
887
888
889
890
891
892debug_entry_t *debug_event_common(debug_info_t *id, int level, const void *buf,
893 int len)
894{
895 debug_entry_t *active;
896 unsigned long flags;
897
898 if (!debug_active || !id->areas)
899 return NULL;
900 if (debug_critical) {
901 if (!spin_trylock_irqsave(&id->lock, flags))
902 return NULL;
903 } else {
904 spin_lock_irqsave(&id->lock, flags);
905 }
906 do {
907 active = get_active_entry(id);
908 memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size));
909 if (len < id->buf_size)
910 memset((DEBUG_DATA(active)) + len, 0, id->buf_size - len);
911 debug_finish_entry(id, active, level, 0);
912 len -= id->buf_size;
913 buf += id->buf_size;
914 } while (len > 0);
915
916 spin_unlock_irqrestore(&id->lock, flags);
917 return active;
918}
919EXPORT_SYMBOL(debug_event_common);
920
921
922
923
924
925debug_entry_t *debug_exception_common(debug_info_t *id, int level,
926 const void *buf, int len)
927{
928 debug_entry_t *active;
929 unsigned long flags;
930
931 if (!debug_active || !id->areas)
932 return NULL;
933 if (debug_critical) {
934 if (!spin_trylock_irqsave(&id->lock, flags))
935 return NULL;
936 } else {
937 spin_lock_irqsave(&id->lock, flags);
938 }
939 do {
940 active = get_active_entry(id);
941 memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size));
942 if (len < id->buf_size)
943 memset((DEBUG_DATA(active)) + len, 0, id->buf_size - len);
944 debug_finish_entry(id, active, level, len <= id->buf_size);
945 len -= id->buf_size;
946 buf += id->buf_size;
947 } while (len > 0);
948
949 spin_unlock_irqrestore(&id->lock, flags);
950 return active;
951}
952EXPORT_SYMBOL(debug_exception_common);
953
954
955
956
957static inline int debug_count_numargs(char *string)
958{
959 int numargs = 0;
960
961 while (*string) {
962 if (*string++ == '%')
963 numargs++;
964 }
965 return numargs;
966}
967
968
969
970
971debug_entry_t *__debug_sprintf_event(debug_info_t *id, int level, char *string, ...)
972{
973 debug_sprintf_entry_t *curr_event;
974 debug_entry_t *active;
975 unsigned long flags;
976 int numargs, idx;
977 va_list ap;
978
979 if (!debug_active || !id->areas)
980 return NULL;
981 numargs = debug_count_numargs(string);
982
983 if (debug_critical) {
984 if (!spin_trylock_irqsave(&id->lock, flags))
985 return NULL;
986 } else {
987 spin_lock_irqsave(&id->lock, flags);
988 }
989 active = get_active_entry(id);
990 curr_event = (debug_sprintf_entry_t *) DEBUG_DATA(active);
991 va_start(ap, string);
992 curr_event->string = string;
993 for (idx = 0; idx < min(numargs, (int)(id->buf_size / sizeof(long)) - 1); idx++)
994 curr_event->args[idx] = va_arg(ap, long);
995 va_end(ap);
996 debug_finish_entry(id, active, level, 0);
997 spin_unlock_irqrestore(&id->lock, flags);
998
999 return active;
1000}
1001EXPORT_SYMBOL(__debug_sprintf_event);
1002
1003
1004
1005
1006debug_entry_t *__debug_sprintf_exception(debug_info_t *id, int level, char *string, ...)
1007{
1008 debug_sprintf_entry_t *curr_event;
1009 debug_entry_t *active;
1010 unsigned long flags;
1011 int numargs, idx;
1012 va_list ap;
1013
1014 if (!debug_active || !id->areas)
1015 return NULL;
1016
1017 numargs = debug_count_numargs(string);
1018
1019 if (debug_critical) {
1020 if (!spin_trylock_irqsave(&id->lock, flags))
1021 return NULL;
1022 } else {
1023 spin_lock_irqsave(&id->lock, flags);
1024 }
1025 active = get_active_entry(id);
1026 curr_event = (debug_sprintf_entry_t *)DEBUG_DATA(active);
1027 va_start(ap, string);
1028 curr_event->string = string;
1029 for (idx = 0; idx < min(numargs, (int)(id->buf_size / sizeof(long)) - 1); idx++)
1030 curr_event->args[idx] = va_arg(ap, long);
1031 va_end(ap);
1032 debug_finish_entry(id, active, level, 1);
1033 spin_unlock_irqrestore(&id->lock, flags);
1034
1035 return active;
1036}
1037EXPORT_SYMBOL(__debug_sprintf_exception);
1038
1039
1040
1041
1042int debug_register_view(debug_info_t *id, struct debug_view *view)
1043{
1044 unsigned long flags;
1045 struct dentry *pde;
1046 umode_t mode;
1047 int rc = 0;
1048 int i;
1049
1050 if (!id)
1051 goto out;
1052 mode = (id->mode | S_IFREG) & ~S_IXUGO;
1053 if (!(view->prolog_proc || view->format_proc || view->header_proc))
1054 mode &= ~(S_IRUSR | S_IRGRP | S_IROTH);
1055 if (!view->input_proc)
1056 mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
1057 pde = debugfs_create_file(view->name, mode, id->debugfs_root_entry,
1058 id, &debug_file_ops);
1059 if (!pde) {
1060 pr_err("Registering view %s/%s failed due to out of "
1061 "memory\n", id->name, view->name);
1062 rc = -1;
1063 goto out;
1064 }
1065 spin_lock_irqsave(&id->lock, flags);
1066 for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
1067 if (!id->views[i])
1068 break;
1069 }
1070 if (i == DEBUG_MAX_VIEWS) {
1071 pr_err("Registering view %s/%s would exceed the maximum "
1072 "number of views %i\n", id->name, view->name, i);
1073 rc = -1;
1074 } else {
1075 id->views[i] = view;
1076 id->debugfs_entries[i] = pde;
1077 }
1078 spin_unlock_irqrestore(&id->lock, flags);
1079 if (rc)
1080 debugfs_remove(pde);
1081out:
1082 return rc;
1083}
1084EXPORT_SYMBOL(debug_register_view);
1085
1086
1087
1088
1089int debug_unregister_view(debug_info_t *id, struct debug_view *view)
1090{
1091 struct dentry *dentry = NULL;
1092 unsigned long flags;
1093 int i, rc = 0;
1094
1095 if (!id)
1096 goto out;
1097 spin_lock_irqsave(&id->lock, flags);
1098 for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
1099 if (id->views[i] == view)
1100 break;
1101 }
1102 if (i == DEBUG_MAX_VIEWS) {
1103 rc = -1;
1104 } else {
1105 dentry = id->debugfs_entries[i];
1106 id->views[i] = NULL;
1107 id->debugfs_entries[i] = NULL;
1108 }
1109 spin_unlock_irqrestore(&id->lock, flags);
1110 debugfs_remove(dentry);
1111out:
1112 return rc;
1113}
1114EXPORT_SYMBOL(debug_unregister_view);
1115
1116static inline char *debug_get_user_string(const char __user *user_buf,
1117 size_t user_len)
1118{
1119 char *buffer;
1120
1121 buffer = kmalloc(user_len + 1, GFP_KERNEL);
1122 if (!buffer)
1123 return ERR_PTR(-ENOMEM);
1124 if (copy_from_user(buffer, user_buf, user_len) != 0) {
1125 kfree(buffer);
1126 return ERR_PTR(-EFAULT);
1127 }
1128
1129 if (buffer[user_len - 1] == '\n')
1130 buffer[user_len - 1] = 0;
1131 else
1132 buffer[user_len] = 0;
1133 return buffer;
1134}
1135
1136static inline int debug_get_uint(char *buf)
1137{
1138 int rc;
1139
1140 buf = skip_spaces(buf);
1141 rc = simple_strtoul(buf, &buf, 10);
1142 if (*buf)
1143 rc = -EINVAL;
1144 return rc;
1145}
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156static int debug_prolog_pages_fn(debug_info_t *id, struct debug_view *view,
1157 char *out_buf)
1158{
1159 return sprintf(out_buf, "%i\n", id->pages_per_area);
1160}
1161
1162
1163
1164
1165
1166static int debug_input_pages_fn(debug_info_t *id, struct debug_view *view,
1167 struct file *file, const char __user *user_buf,
1168 size_t user_len, loff_t *offset)
1169{
1170 int rc, new_pages;
1171 char *str;
1172
1173 if (user_len > 0x10000)
1174 user_len = 0x10000;
1175 if (*offset != 0) {
1176 rc = -EPIPE;
1177 goto out;
1178 }
1179 str = debug_get_user_string(user_buf, user_len);
1180 if (IS_ERR(str)) {
1181 rc = PTR_ERR(str);
1182 goto out;
1183 }
1184 new_pages = debug_get_uint(str);
1185 if (new_pages < 0) {
1186 rc = -EINVAL;
1187 goto free_str;
1188 }
1189 rc = debug_set_size(id, id->nr_areas, new_pages);
1190 if (rc != 0) {
1191 rc = -EINVAL;
1192 goto free_str;
1193 }
1194 rc = user_len;
1195free_str:
1196 kfree(str);
1197out:
1198 *offset += user_len;
1199 return rc;
1200}
1201
1202
1203
1204
1205static int debug_prolog_level_fn(debug_info_t *id, struct debug_view *view,
1206 char *out_buf)
1207{
1208 int rc = 0;
1209
1210 if (id->level == DEBUG_OFF_LEVEL)
1211 rc = sprintf(out_buf, "-\n");
1212 else
1213 rc = sprintf(out_buf, "%i\n", id->level);
1214 return rc;
1215}
1216
1217
1218
1219
1220static int debug_input_level_fn(debug_info_t *id, struct debug_view *view,
1221 struct file *file, const char __user *user_buf,
1222 size_t user_len, loff_t *offset)
1223{
1224 int rc, new_level;
1225 char *str;
1226
1227 if (user_len > 0x10000)
1228 user_len = 0x10000;
1229 if (*offset != 0) {
1230 rc = -EPIPE;
1231 goto out;
1232 }
1233 str = debug_get_user_string(user_buf, user_len);
1234 if (IS_ERR(str)) {
1235 rc = PTR_ERR(str);
1236 goto out;
1237 }
1238 if (str[0] == '-') {
1239 debug_set_level(id, DEBUG_OFF_LEVEL);
1240 rc = user_len;
1241 goto free_str;
1242 } else {
1243 new_level = debug_get_uint(str);
1244 }
1245 if (new_level < 0) {
1246 pr_warn("%s is not a valid level for a debug feature\n", str);
1247 rc = -EINVAL;
1248 } else {
1249 debug_set_level(id, new_level);
1250 rc = user_len;
1251 }
1252free_str:
1253 kfree(str);
1254out:
1255 *offset += user_len;
1256 return rc;
1257}
1258
1259
1260
1261
1262static void debug_flush(debug_info_t *id, int area)
1263{
1264 unsigned long flags;
1265 int i, j;
1266
1267 if (!id || !id->areas)
1268 return;
1269 spin_lock_irqsave(&id->lock, flags);
1270 if (area == DEBUG_FLUSH_ALL) {
1271 id->active_area = 0;
1272 memset(id->active_entries, 0, id->nr_areas * sizeof(int));
1273 for (i = 0; i < id->nr_areas; i++) {
1274 id->active_pages[i] = 0;
1275 for (j = 0; j < id->pages_per_area; j++)
1276 memset(id->areas[i][j], 0, PAGE_SIZE);
1277 }
1278 } else if (area >= 0 && area < id->nr_areas) {
1279 id->active_entries[area] = 0;
1280 id->active_pages[area] = 0;
1281 for (i = 0; i < id->pages_per_area; i++)
1282 memset(id->areas[area][i], 0, PAGE_SIZE);
1283 }
1284 spin_unlock_irqrestore(&id->lock, flags);
1285}
1286
1287
1288
1289
1290static int debug_input_flush_fn(debug_info_t *id, struct debug_view *view,
1291 struct file *file, const char __user *user_buf,
1292 size_t user_len, loff_t *offset)
1293{
1294 char input_buf[1];
1295 int rc = user_len;
1296
1297 if (user_len > 0x10000)
1298 user_len = 0x10000;
1299 if (*offset != 0) {
1300 rc = -EPIPE;
1301 goto out;
1302 }
1303 if (copy_from_user(input_buf, user_buf, 1)) {
1304 rc = -EFAULT;
1305 goto out;
1306 }
1307 if (input_buf[0] == '-') {
1308 debug_flush(id, DEBUG_FLUSH_ALL);
1309 goto out;
1310 }
1311 if (isdigit(input_buf[0])) {
1312 int area = ((int) input_buf[0] - (int) '0');
1313
1314 debug_flush(id, area);
1315 goto out;
1316 }
1317
1318 pr_info("Flushing debug data failed because %c is not a valid "
1319 "area\n", input_buf[0]);
1320
1321out:
1322 *offset += user_len;
1323 return rc;
1324}
1325
1326
1327
1328
1329static int debug_raw_header_fn(debug_info_t *id, struct debug_view *view,
1330 int area, debug_entry_t *entry, char *out_buf)
1331{
1332 int rc;
1333
1334 rc = sizeof(debug_entry_t);
1335 memcpy(out_buf, entry, sizeof(debug_entry_t));
1336 return rc;
1337}
1338
1339
1340
1341
1342static int debug_raw_format_fn(debug_info_t *id, struct debug_view *view,
1343 char *out_buf, const char *in_buf)
1344{
1345 int rc;
1346
1347 rc = id->buf_size;
1348 memcpy(out_buf, in_buf, id->buf_size);
1349 return rc;
1350}
1351
1352
1353
1354
1355static int debug_hex_ascii_format_fn(debug_info_t *id, struct debug_view *view,
1356 char *out_buf, const char *in_buf)
1357{
1358 int i, rc = 0;
1359
1360 for (i = 0; i < id->buf_size; i++)
1361 rc += sprintf(out_buf + rc, "%02x ", ((unsigned char *) in_buf)[i]);
1362 rc += sprintf(out_buf + rc, "| ");
1363 for (i = 0; i < id->buf_size; i++) {
1364 unsigned char c = in_buf[i];
1365
1366 if (isascii(c) && isprint(c))
1367 rc += sprintf(out_buf + rc, "%c", c);
1368 else
1369 rc += sprintf(out_buf + rc, ".");
1370 }
1371 rc += sprintf(out_buf + rc, "\n");
1372 return rc;
1373}
1374
1375
1376
1377
1378int debug_dflt_header_fn(debug_info_t *id, struct debug_view *view,
1379 int area, debug_entry_t *entry, char *out_buf)
1380{
1381 unsigned long base, sec, usec;
1382 unsigned long caller;
1383 unsigned int level;
1384 char *except_str;
1385 int rc = 0;
1386
1387 level = entry->id.fields.level;
1388 base = (*(unsigned long *) &tod_clock_base[0]) >> 4;
1389 sec = (entry->id.stck >> 12) + base - (TOD_UNIX_EPOCH >> 12);
1390 usec = do_div(sec, USEC_PER_SEC);
1391
1392 if (entry->id.fields.exception)
1393 except_str = "*";
1394 else
1395 except_str = "-";
1396 caller = (unsigned long) entry->caller;
1397 rc += sprintf(out_buf, "%02i %011ld:%06lu %1u %1s %02i %pK ",
1398 area, sec, usec, level, except_str,
1399 entry->id.fields.cpuid, (void *)caller);
1400 return rc;
1401}
1402EXPORT_SYMBOL(debug_dflt_header_fn);
1403
1404
1405
1406
1407
1408
1409#define DEBUG_SPRINTF_MAX_ARGS 10
1410
1411static int debug_sprintf_format_fn(debug_info_t *id, struct debug_view *view,
1412 char *out_buf, debug_sprintf_entry_t *curr_event)
1413{
1414 int num_longs, num_used_args = 0, i, rc = 0;
1415 int index[DEBUG_SPRINTF_MAX_ARGS];
1416
1417
1418 num_longs = id->buf_size / sizeof(long);
1419
1420 if (num_longs < 1)
1421 goto out;
1422 if (num_longs == 1) {
1423
1424 strcpy(out_buf, curr_event->string);
1425 rc = strlen(curr_event->string);
1426 goto out;
1427 }
1428
1429
1430 num_used_args = min(DEBUG_SPRINTF_MAX_ARGS, (num_longs - 1));
1431
1432 memset(index, 0, DEBUG_SPRINTF_MAX_ARGS * sizeof(int));
1433
1434 for (i = 0; i < num_used_args; i++)
1435 index[i] = i;
1436
1437 rc = sprintf(out_buf, curr_event->string, curr_event->args[index[0]],
1438 curr_event->args[index[1]], curr_event->args[index[2]],
1439 curr_event->args[index[3]], curr_event->args[index[4]],
1440 curr_event->args[index[5]], curr_event->args[index[6]],
1441 curr_event->args[index[7]], curr_event->args[index[8]],
1442 curr_event->args[index[9]]);
1443out:
1444 return rc;
1445}
1446
1447
1448
1449
1450
1451static int __init debug_init(void)
1452{
1453 s390dbf_sysctl_header = register_sysctl_table(s390dbf_dir_table);
1454 mutex_lock(&debug_mutex);
1455 debug_debugfs_root_entry = debugfs_create_dir(DEBUG_DIR_ROOT, NULL);
1456 initialized = 1;
1457 mutex_unlock(&debug_mutex);
1458 return 0;
1459}
1460postcore_initcall(debug_init);
1461
