Loading...
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * S/390 debug facility
4 *
5 * Copyright IBM Corp. 1999, 2020
6 *
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#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/minmax.h>
28#include <linux/debugfs.h>
29
30#include <asm/debug.h>
31
32#define DEBUG_PROLOG_ENTRY -1
33
34#define ALL_AREAS 0 /* copy all debug areas */
35#define NO_AREAS 1 /* copy no debug areas */
36
37/* typedefs */
38
39typedef struct file_private_info {
40 loff_t offset; /* offset of last read in file */
41 int act_area; /* number of last formated area */
42 int act_page; /* act page in given area */
43 int act_entry; /* last formated entry (offset */
44 /* relative to beginning of last */
45 /* formated page) */
46 size_t act_entry_offset; /* up to this offset we copied */
47 /* in last read the last formated */
48 /* entry to userland */
49 char temp_buf[2048]; /* buffer for output */
50 debug_info_t *debug_info_org; /* original debug information */
51 debug_info_t *debug_info_snap; /* snapshot of debug information */
52 struct debug_view *view; /* used view of debug info */
53} file_private_info_t;
54
55typedef struct {
56 char *string;
57 /*
58 * This assumes that all args are converted into longs
59 * on L/390 this is the case for all types of parameter
60 * except of floats, and long long (32 bit)
61 *
62 */
63 long args[0];
64} debug_sprintf_entry_t;
65
66/* internal function prototyes */
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_sprintf_format_fn(debug_info_t *id, struct debug_view *view,
95 char *out_buf, const char *inbuf);
96static void debug_areas_swap(debug_info_t *a, debug_info_t *b);
97static void debug_events_append(debug_info_t *dest, debug_info_t *src);
98
99/* globals */
100
101struct debug_view debug_hex_ascii_view = {
102 "hex_ascii",
103 NULL,
104 &debug_dflt_header_fn,
105 &debug_hex_ascii_format_fn,
106 NULL,
107 NULL
108};
109EXPORT_SYMBOL(debug_hex_ascii_view);
110
111static struct debug_view debug_level_view = {
112 "level",
113 &debug_prolog_level_fn,
114 NULL,
115 NULL,
116 &debug_input_level_fn,
117 NULL
118};
119
120static struct debug_view debug_pages_view = {
121 "pages",
122 &debug_prolog_pages_fn,
123 NULL,
124 NULL,
125 &debug_input_pages_fn,
126 NULL
127};
128
129static struct debug_view debug_flush_view = {
130 "flush",
131 NULL,
132 NULL,
133 NULL,
134 &debug_input_flush_fn,
135 NULL
136};
137
138struct debug_view debug_sprintf_view = {
139 "sprintf",
140 NULL,
141 &debug_dflt_header_fn,
142 &debug_sprintf_format_fn,
143 NULL,
144 NULL
145};
146EXPORT_SYMBOL(debug_sprintf_view);
147
148/* used by dump analysis tools to determine version of debug feature */
149static unsigned int __used debug_feature_version = __DEBUG_FEATURE_VERSION;
150
151/* static globals */
152
153static debug_info_t *debug_area_first;
154static debug_info_t *debug_area_last;
155static DEFINE_MUTEX(debug_mutex);
156
157static int initialized;
158static int debug_critical;
159
160static const struct file_operations debug_file_ops = {
161 .owner = THIS_MODULE,
162 .read = debug_output,
163 .write = debug_input,
164 .open = debug_open,
165 .release = debug_close,
166 .llseek = no_llseek,
167};
168
169static struct dentry *debug_debugfs_root_entry;
170
171/* functions */
172
173/*
174 * debug_areas_alloc
175 * - Debug areas are implemented as a threedimensonal array:
176 * areas[areanumber][pagenumber][pageoffset]
177 */
178
179static debug_entry_t ***debug_areas_alloc(int pages_per_area, int nr_areas)
180{
181 debug_entry_t ***areas;
182 int i, j;
183
184 areas = kmalloc_array(nr_areas, sizeof(debug_entry_t **), GFP_KERNEL);
185 if (!areas)
186 goto fail_malloc_areas;
187 for (i = 0; i < nr_areas; i++) {
188 /* GFP_NOWARN to avoid user triggerable WARN, we handle fails */
189 areas[i] = kmalloc_array(pages_per_area,
190 sizeof(debug_entry_t *),
191 GFP_KERNEL | __GFP_NOWARN);
192 if (!areas[i])
193 goto fail_malloc_areas2;
194 for (j = 0; j < pages_per_area; j++) {
195 areas[i][j] = kzalloc(PAGE_SIZE, GFP_KERNEL);
196 if (!areas[i][j]) {
197 for (j--; j >= 0 ; j--)
198 kfree(areas[i][j]);
199 kfree(areas[i]);
200 goto fail_malloc_areas2;
201 }
202 }
203 }
204 return areas;
205
206fail_malloc_areas2:
207 for (i--; i >= 0; i--) {
208 for (j = 0; j < pages_per_area; j++)
209 kfree(areas[i][j]);
210 kfree(areas[i]);
211 }
212 kfree(areas);
213fail_malloc_areas:
214 return NULL;
215}
216
217/*
218 * debug_info_alloc
219 * - alloc new debug-info
220 */
221static debug_info_t *debug_info_alloc(const char *name, int pages_per_area,
222 int nr_areas, int buf_size, int level,
223 int mode)
224{
225 debug_info_t *rc;
226
227 /* alloc everything */
228 rc = kmalloc(sizeof(debug_info_t), GFP_KERNEL);
229 if (!rc)
230 goto fail_malloc_rc;
231 rc->active_entries = kcalloc(nr_areas, sizeof(int), GFP_KERNEL);
232 if (!rc->active_entries)
233 goto fail_malloc_active_entries;
234 rc->active_pages = kcalloc(nr_areas, sizeof(int), GFP_KERNEL);
235 if (!rc->active_pages)
236 goto fail_malloc_active_pages;
237 if ((mode == ALL_AREAS) && (pages_per_area != 0)) {
238 rc->areas = debug_areas_alloc(pages_per_area, nr_areas);
239 if (!rc->areas)
240 goto fail_malloc_areas;
241 } else {
242 rc->areas = NULL;
243 }
244
245 /* initialize members */
246 spin_lock_init(&rc->lock);
247 rc->pages_per_area = pages_per_area;
248 rc->nr_areas = nr_areas;
249 rc->active_area = 0;
250 rc->level = level;
251 rc->buf_size = buf_size;
252 rc->entry_size = sizeof(debug_entry_t) + buf_size;
253 strscpy(rc->name, name, sizeof(rc->name));
254 memset(rc->views, 0, DEBUG_MAX_VIEWS * sizeof(struct debug_view *));
255 memset(rc->debugfs_entries, 0, DEBUG_MAX_VIEWS * sizeof(struct dentry *));
256 refcount_set(&(rc->ref_count), 0);
257
258 return rc;
259
260fail_malloc_areas:
261 kfree(rc->active_pages);
262fail_malloc_active_pages:
263 kfree(rc->active_entries);
264fail_malloc_active_entries:
265 kfree(rc);
266fail_malloc_rc:
267 return NULL;
268}
269
270/*
271 * debug_areas_free
272 * - free all debug areas
273 */
274static void debug_areas_free(debug_info_t *db_info)
275{
276 int i, j;
277
278 if (!db_info->areas)
279 return;
280 for (i = 0; i < db_info->nr_areas; i++) {
281 for (j = 0; j < db_info->pages_per_area; j++)
282 kfree(db_info->areas[i][j]);
283 kfree(db_info->areas[i]);
284 }
285 kfree(db_info->areas);
286 db_info->areas = NULL;
287}
288
289/*
290 * debug_info_free
291 * - free memory debug-info
292 */
293static void debug_info_free(debug_info_t *db_info)
294{
295 debug_areas_free(db_info);
296 kfree(db_info->active_entries);
297 kfree(db_info->active_pages);
298 kfree(db_info);
299}
300
301/*
302 * debug_info_create
303 * - create new debug-info
304 */
305
306static debug_info_t *debug_info_create(const char *name, int pages_per_area,
307 int nr_areas, int buf_size, umode_t mode)
308{
309 debug_info_t *rc;
310
311 rc = debug_info_alloc(name, pages_per_area, nr_areas, buf_size,
312 DEBUG_DEFAULT_LEVEL, ALL_AREAS);
313 if (!rc)
314 goto out;
315
316 rc->mode = mode & ~S_IFMT;
317 refcount_set(&rc->ref_count, 1);
318out:
319 return rc;
320}
321
322/*
323 * debug_info_copy
324 * - copy debug-info
325 */
326static debug_info_t *debug_info_copy(debug_info_t *in, int mode)
327{
328 unsigned long flags;
329 debug_info_t *rc;
330 int i, j;
331
332 /* get a consistent copy of the debug areas */
333 do {
334 rc = debug_info_alloc(in->name, in->pages_per_area,
335 in->nr_areas, in->buf_size, in->level, mode);
336 spin_lock_irqsave(&in->lock, flags);
337 if (!rc)
338 goto out;
339 /* has something changed in the meantime ? */
340 if ((rc->pages_per_area == in->pages_per_area) &&
341 (rc->nr_areas == in->nr_areas)) {
342 break;
343 }
344 spin_unlock_irqrestore(&in->lock, flags);
345 debug_info_free(rc);
346 } while (1);
347
348 if (mode == NO_AREAS)
349 goto out;
350
351 for (i = 0; i < in->nr_areas; i++) {
352 for (j = 0; j < in->pages_per_area; j++)
353 memcpy(rc->areas[i][j], in->areas[i][j], PAGE_SIZE);
354 }
355out:
356 spin_unlock_irqrestore(&in->lock, flags);
357 return rc;
358}
359
360/*
361 * debug_info_get
362 * - increments reference count for debug-info
363 */
364static void debug_info_get(debug_info_t *db_info)
365{
366 if (db_info)
367 refcount_inc(&db_info->ref_count);
368}
369
370/*
371 * debug_info_put:
372 * - decreases reference count for debug-info and frees it if necessary
373 */
374static void debug_info_put(debug_info_t *db_info)
375{
376 if (!db_info)
377 return;
378 if (refcount_dec_and_test(&db_info->ref_count))
379 debug_info_free(db_info);
380}
381
382/*
383 * debug_format_entry:
384 * - format one debug entry and return size of formated data
385 */
386static int debug_format_entry(file_private_info_t *p_info)
387{
388 debug_info_t *id_snap = p_info->debug_info_snap;
389 struct debug_view *view = p_info->view;
390 debug_entry_t *act_entry;
391 size_t len = 0;
392
393 if (p_info->act_entry == DEBUG_PROLOG_ENTRY) {
394 /* print prolog */
395 if (view->prolog_proc)
396 len += view->prolog_proc(id_snap, view, p_info->temp_buf);
397 goto out;
398 }
399 if (!id_snap->areas) /* this is true, if we have a prolog only view */
400 goto out; /* or if 'pages_per_area' is 0 */
401 act_entry = (debug_entry_t *) ((char *)id_snap->areas[p_info->act_area]
402 [p_info->act_page] + p_info->act_entry);
403
404 if (act_entry->clock == 0LL)
405 goto out; /* empty entry */
406 if (view->header_proc)
407 len += view->header_proc(id_snap, view, p_info->act_area,
408 act_entry, p_info->temp_buf + len);
409 if (view->format_proc)
410 len += view->format_proc(id_snap, view, p_info->temp_buf + len,
411 DEBUG_DATA(act_entry));
412out:
413 return len;
414}
415
416/*
417 * debug_next_entry:
418 * - goto next entry in p_info
419 */
420static inline int debug_next_entry(file_private_info_t *p_info)
421{
422 debug_info_t *id;
423
424 id = p_info->debug_info_snap;
425 if (p_info->act_entry == DEBUG_PROLOG_ENTRY) {
426 p_info->act_entry = 0;
427 p_info->act_page = 0;
428 goto out;
429 }
430 if (!id->areas)
431 return 1;
432 p_info->act_entry += id->entry_size;
433 /* switch to next page, if we reached the end of the page */
434 if (p_info->act_entry > (PAGE_SIZE - id->entry_size)) {
435 /* next page */
436 p_info->act_entry = 0;
437 p_info->act_page += 1;
438 if ((p_info->act_page % id->pages_per_area) == 0) {
439 /* next area */
440 p_info->act_area++;
441 p_info->act_page = 0;
442 }
443 if (p_info->act_area >= id->nr_areas)
444 return 1;
445 }
446out:
447 return 0;
448}
449
450/*
451 * debug_output:
452 * - called for user read()
453 * - copies formated debug entries to the user buffer
454 */
455static ssize_t debug_output(struct file *file, /* file descriptor */
456 char __user *user_buf, /* user buffer */
457 size_t len, /* length of buffer */
458 loff_t *offset) /* offset in the file */
459{
460 size_t count = 0;
461 size_t entry_offset;
462 file_private_info_t *p_info;
463
464 p_info = (file_private_info_t *) file->private_data;
465 if (*offset != p_info->offset)
466 return -EPIPE;
467 if (p_info->act_area >= p_info->debug_info_snap->nr_areas)
468 return 0;
469 entry_offset = p_info->act_entry_offset;
470 while (count < len) {
471 int formatted_line_residue;
472 int formatted_line_size;
473 int user_buf_residue;
474 size_t copy_size;
475
476 formatted_line_size = debug_format_entry(p_info);
477 formatted_line_residue = formatted_line_size - entry_offset;
478 user_buf_residue = len-count;
479 copy_size = min(user_buf_residue, formatted_line_residue);
480 if (copy_size) {
481 if (copy_to_user(user_buf + count, p_info->temp_buf
482 + entry_offset, copy_size))
483 return -EFAULT;
484 count += copy_size;
485 entry_offset += copy_size;
486 }
487 if (copy_size == formatted_line_residue) {
488 entry_offset = 0;
489 if (debug_next_entry(p_info))
490 goto out;
491 }
492 }
493out:
494 p_info->offset = *offset + count;
495 p_info->act_entry_offset = entry_offset;
496 *offset = p_info->offset;
497 return count;
498}
499
500/*
501 * debug_input:
502 * - called for user write()
503 * - calls input function of view
504 */
505static ssize_t debug_input(struct file *file, const char __user *user_buf,
506 size_t length, loff_t *offset)
507{
508 file_private_info_t *p_info;
509 int rc = 0;
510
511 mutex_lock(&debug_mutex);
512 p_info = ((file_private_info_t *) file->private_data);
513 if (p_info->view->input_proc) {
514 rc = p_info->view->input_proc(p_info->debug_info_org,
515 p_info->view, file, user_buf,
516 length, offset);
517 } else {
518 rc = -EPERM;
519 }
520 mutex_unlock(&debug_mutex);
521 return rc; /* number of input characters */
522}
523
524/*
525 * debug_open:
526 * - called for user open()
527 * - copies formated output to private_data area of the file
528 * handle
529 */
530static int debug_open(struct inode *inode, struct file *file)
531{
532 debug_info_t *debug_info, *debug_info_snapshot;
533 file_private_info_t *p_info;
534 int i, rc = 0;
535
536 mutex_lock(&debug_mutex);
537 debug_info = file_inode(file)->i_private;
538 /* find debug view */
539 for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
540 if (!debug_info->views[i])
541 continue;
542 else if (debug_info->debugfs_entries[i] == file->f_path.dentry)
543 goto found; /* found view ! */
544 }
545 /* no entry found */
546 rc = -EINVAL;
547 goto out;
548
549found:
550
551 /* Make snapshot of current debug areas to get it consistent. */
552 /* To copy all the areas is only needed, if we have a view which */
553 /* formats the debug areas. */
554
555 if (!debug_info->views[i]->format_proc && !debug_info->views[i]->header_proc)
556 debug_info_snapshot = debug_info_copy(debug_info, NO_AREAS);
557 else
558 debug_info_snapshot = debug_info_copy(debug_info, ALL_AREAS);
559
560 if (!debug_info_snapshot) {
561 rc = -ENOMEM;
562 goto out;
563 }
564 p_info = kmalloc(sizeof(file_private_info_t), GFP_KERNEL);
565 if (!p_info) {
566 debug_info_free(debug_info_snapshot);
567 rc = -ENOMEM;
568 goto out;
569 }
570 p_info->offset = 0;
571 p_info->debug_info_snap = debug_info_snapshot;
572 p_info->debug_info_org = debug_info;
573 p_info->view = debug_info->views[i];
574 p_info->act_area = 0;
575 p_info->act_page = 0;
576 p_info->act_entry = DEBUG_PROLOG_ENTRY;
577 p_info->act_entry_offset = 0;
578 file->private_data = p_info;
579 debug_info_get(debug_info);
580 nonseekable_open(inode, file);
581out:
582 mutex_unlock(&debug_mutex);
583 return rc;
584}
585
586/*
587 * debug_close:
588 * - called for user close()
589 * - deletes private_data area of the file handle
590 */
591static int debug_close(struct inode *inode, struct file *file)
592{
593 file_private_info_t *p_info;
594
595 p_info = (file_private_info_t *) file->private_data;
596 if (p_info->debug_info_snap)
597 debug_info_free(p_info->debug_info_snap);
598 debug_info_put(p_info->debug_info_org);
599 kfree(file->private_data);
600 return 0; /* success */
601}
602
603/* Create debugfs entries and add to internal list. */
604static void _debug_register(debug_info_t *id)
605{
606 /* create root directory */
607 id->debugfs_root_entry = debugfs_create_dir(id->name,
608 debug_debugfs_root_entry);
609
610 /* append new element to linked list */
611 if (!debug_area_first) {
612 /* first element in list */
613 debug_area_first = id;
614 id->prev = NULL;
615 } else {
616 /* append element to end of list */
617 debug_area_last->next = id;
618 id->prev = debug_area_last;
619 }
620 debug_area_last = id;
621 id->next = NULL;
622
623 debug_register_view(id, &debug_level_view);
624 debug_register_view(id, &debug_flush_view);
625 debug_register_view(id, &debug_pages_view);
626}
627
628/**
629 * debug_register_mode() - creates and initializes debug area.
630 *
631 * @name: Name of debug log (e.g. used for debugfs entry)
632 * @pages_per_area: Number of pages, which will be allocated per area
633 * @nr_areas: Number of debug areas
634 * @buf_size: Size of data area in each debug entry
635 * @mode: File mode for debugfs files. E.g. S_IRWXUGO
636 * @uid: User ID for debugfs files. Currently only 0 is supported.
637 * @gid: Group ID for debugfs files. Currently only 0 is supported.
638 *
639 * Return:
640 * - Handle for generated debug area
641 * - %NULL if register failed
642 *
643 * Allocates memory for a debug log.
644 * Must not be called within an interrupt handler.
645 */
646debug_info_t *debug_register_mode(const char *name, int pages_per_area,
647 int nr_areas, int buf_size, umode_t mode,
648 uid_t uid, gid_t gid)
649{
650 debug_info_t *rc = NULL;
651
652 /* Since debugfs currently does not support uid/gid other than root, */
653 /* we do not allow gid/uid != 0 until we get support for that. */
654 if ((uid != 0) || (gid != 0))
655 pr_warn("Root becomes the owner of all s390dbf files in sysfs\n");
656 BUG_ON(!initialized);
657
658 /* create new debug_info */
659 rc = debug_info_create(name, pages_per_area, nr_areas, buf_size, mode);
660 if (rc) {
661 mutex_lock(&debug_mutex);
662 _debug_register(rc);
663 mutex_unlock(&debug_mutex);
664 } else {
665 pr_err("Registering debug feature %s failed\n", name);
666 }
667 return rc;
668}
669EXPORT_SYMBOL(debug_register_mode);
670
671/**
672 * debug_register() - creates and initializes debug area with default file mode.
673 *
674 * @name: Name of debug log (e.g. used for debugfs entry)
675 * @pages_per_area: Number of pages, which will be allocated per area
676 * @nr_areas: Number of debug areas
677 * @buf_size: Size of data area in each debug entry
678 *
679 * Return:
680 * - Handle for generated debug area
681 * - %NULL if register failed
682 *
683 * Allocates memory for a debug log.
684 * The debugfs file mode access permissions are read and write for user.
685 * Must not be called within an interrupt handler.
686 */
687debug_info_t *debug_register(const char *name, int pages_per_area,
688 int nr_areas, int buf_size)
689{
690 return debug_register_mode(name, pages_per_area, nr_areas, buf_size,
691 S_IRUSR | S_IWUSR, 0, 0);
692}
693EXPORT_SYMBOL(debug_register);
694
695/**
696 * debug_register_static() - registers a static debug area
697 *
698 * @id: Handle for static debug area
699 * @pages_per_area: Number of pages per area
700 * @nr_areas: Number of debug areas
701 *
702 * Register debug_info_t defined using DEFINE_STATIC_DEBUG_INFO.
703 *
704 * Note: This function is called automatically via an initcall generated by
705 * DEFINE_STATIC_DEBUG_INFO.
706 */
707void debug_register_static(debug_info_t *id, int pages_per_area, int nr_areas)
708{
709 unsigned long flags;
710 debug_info_t *copy;
711
712 if (!initialized) {
713 pr_err("Tried to register debug feature %s too early\n",
714 id->name);
715 return;
716 }
717
718 copy = debug_info_alloc("", pages_per_area, nr_areas, id->buf_size,
719 id->level, ALL_AREAS);
720 if (!copy) {
721 pr_err("Registering debug feature %s failed\n", id->name);
722
723 /* Clear pointers to prevent tracing into released initdata. */
724 spin_lock_irqsave(&id->lock, flags);
725 id->areas = NULL;
726 id->active_pages = NULL;
727 id->active_entries = NULL;
728 spin_unlock_irqrestore(&id->lock, flags);
729
730 return;
731 }
732
733 /* Replace static trace area with dynamic copy. */
734 spin_lock_irqsave(&id->lock, flags);
735 debug_events_append(copy, id);
736 debug_areas_swap(id, copy);
737 spin_unlock_irqrestore(&id->lock, flags);
738
739 /* Clear pointers to initdata and discard copy. */
740 copy->areas = NULL;
741 copy->active_pages = NULL;
742 copy->active_entries = NULL;
743 debug_info_free(copy);
744
745 mutex_lock(&debug_mutex);
746 _debug_register(id);
747 mutex_unlock(&debug_mutex);
748}
749
750/* Remove debugfs entries and remove from internal list. */
751static void _debug_unregister(debug_info_t *id)
752{
753 int i;
754
755 for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
756 if (!id->views[i])
757 continue;
758 debugfs_remove(id->debugfs_entries[i]);
759 }
760 debugfs_remove(id->debugfs_root_entry);
761 if (id == debug_area_first)
762 debug_area_first = id->next;
763 if (id == debug_area_last)
764 debug_area_last = id->prev;
765 if (id->prev)
766 id->prev->next = id->next;
767 if (id->next)
768 id->next->prev = id->prev;
769}
770
771/**
772 * debug_unregister() - give back debug area.
773 *
774 * @id: handle for debug log
775 *
776 * Return:
777 * none
778 */
779void debug_unregister(debug_info_t *id)
780{
781 if (!id)
782 return;
783 mutex_lock(&debug_mutex);
784 _debug_unregister(id);
785 mutex_unlock(&debug_mutex);
786
787 debug_info_put(id);
788}
789EXPORT_SYMBOL(debug_unregister);
790
791/*
792 * debug_set_size:
793 * - set area size (number of pages) and number of areas
794 */
795static int debug_set_size(debug_info_t *id, int nr_areas, int pages_per_area)
796{
797 debug_info_t *new_id;
798 unsigned long flags;
799
800 if (!id || (nr_areas <= 0) || (pages_per_area < 0))
801 return -EINVAL;
802
803 new_id = debug_info_alloc("", pages_per_area, nr_areas, id->buf_size,
804 id->level, ALL_AREAS);
805 if (!new_id) {
806 pr_info("Allocating memory for %i pages failed\n",
807 pages_per_area);
808 return -ENOMEM;
809 }
810
811 spin_lock_irqsave(&id->lock, flags);
812 debug_events_append(new_id, id);
813 debug_areas_swap(new_id, id);
814 debug_info_free(new_id);
815 spin_unlock_irqrestore(&id->lock, flags);
816 pr_info("%s: set new size (%i pages)\n", id->name, pages_per_area);
817
818 return 0;
819}
820
821/**
822 * debug_set_level() - Sets new actual debug level if new_level is valid.
823 *
824 * @id: handle for debug log
825 * @new_level: new debug level
826 *
827 * Return:
828 * none
829 */
830void debug_set_level(debug_info_t *id, int new_level)
831{
832 unsigned long flags;
833
834 if (!id)
835 return;
836
837 if (new_level == DEBUG_OFF_LEVEL) {
838 pr_info("%s: switched off\n", id->name);
839 } else if ((new_level > DEBUG_MAX_LEVEL) || (new_level < 0)) {
840 pr_info("%s: level %i is out of range (%i - %i)\n",
841 id->name, new_level, 0, DEBUG_MAX_LEVEL);
842 return;
843 }
844
845 spin_lock_irqsave(&id->lock, flags);
846 id->level = new_level;
847 spin_unlock_irqrestore(&id->lock, flags);
848}
849EXPORT_SYMBOL(debug_set_level);
850
851/*
852 * proceed_active_entry:
853 * - set active entry to next in the ring buffer
854 */
855static inline void proceed_active_entry(debug_info_t *id)
856{
857 if ((id->active_entries[id->active_area] += id->entry_size)
858 > (PAGE_SIZE - id->entry_size)) {
859 id->active_entries[id->active_area] = 0;
860 id->active_pages[id->active_area] =
861 (id->active_pages[id->active_area] + 1) %
862 id->pages_per_area;
863 }
864}
865
866/*
867 * proceed_active_area:
868 * - set active area to next in the ring buffer
869 */
870static inline void proceed_active_area(debug_info_t *id)
871{
872 id->active_area++;
873 id->active_area = id->active_area % id->nr_areas;
874}
875
876/*
877 * get_active_entry:
878 */
879static inline debug_entry_t *get_active_entry(debug_info_t *id)
880{
881 return (debug_entry_t *) (((char *) id->areas[id->active_area]
882 [id->active_pages[id->active_area]]) +
883 id->active_entries[id->active_area]);
884}
885
886/* Swap debug areas of a and b. */
887static void debug_areas_swap(debug_info_t *a, debug_info_t *b)
888{
889 swap(a->nr_areas, b->nr_areas);
890 swap(a->pages_per_area, b->pages_per_area);
891 swap(a->areas, b->areas);
892 swap(a->active_area, b->active_area);
893 swap(a->active_pages, b->active_pages);
894 swap(a->active_entries, b->active_entries);
895}
896
897/* Append all debug events in active area from source to destination log. */
898static void debug_events_append(debug_info_t *dest, debug_info_t *src)
899{
900 debug_entry_t *from, *to, *last;
901
902 if (!src->areas || !dest->areas)
903 return;
904
905 /* Loop over all entries in src, starting with oldest. */
906 from = get_active_entry(src);
907 last = from;
908 do {
909 if (from->clock != 0LL) {
910 to = get_active_entry(dest);
911 memset(to, 0, dest->entry_size);
912 memcpy(to, from, min(src->entry_size,
913 dest->entry_size));
914 proceed_active_entry(dest);
915 }
916
917 proceed_active_entry(src);
918 from = get_active_entry(src);
919 } while (from != last);
920}
921
922/*
923 * debug_finish_entry:
924 * - set timestamp, caller address, cpu number etc.
925 */
926
927static inline void debug_finish_entry(debug_info_t *id, debug_entry_t *active,
928 int level, int exception)
929{
930 unsigned long timestamp;
931 union tod_clock clk;
932
933 store_tod_clock_ext(&clk);
934 timestamp = clk.us;
935 timestamp -= TOD_UNIX_EPOCH >> 12;
936 active->clock = timestamp;
937 active->cpu = smp_processor_id();
938 active->caller = __builtin_return_address(0);
939 active->exception = exception;
940 active->level = level;
941 proceed_active_entry(id);
942 if (exception)
943 proceed_active_area(id);
944}
945
946static int debug_stoppable = 1;
947static int debug_active = 1;
948
949#define CTL_S390DBF_STOPPABLE 5678
950#define CTL_S390DBF_ACTIVE 5679
951
952/*
953 * proc handler for the running debug_active sysctl
954 * always allow read, allow write only if debug_stoppable is set or
955 * if debug_active is already off
956 */
957static int s390dbf_procactive(struct ctl_table *table, int write,
958 void *buffer, size_t *lenp, loff_t *ppos)
959{
960 if (!write || debug_stoppable || !debug_active)
961 return proc_dointvec(table, write, buffer, lenp, ppos);
962 else
963 return 0;
964}
965
966static struct ctl_table s390dbf_table[] = {
967 {
968 .procname = "debug_stoppable",
969 .data = &debug_stoppable,
970 .maxlen = sizeof(int),
971 .mode = S_IRUGO | S_IWUSR,
972 .proc_handler = proc_dointvec,
973 },
974 {
975 .procname = "debug_active",
976 .data = &debug_active,
977 .maxlen = sizeof(int),
978 .mode = S_IRUGO | S_IWUSR,
979 .proc_handler = s390dbf_procactive,
980 },
981 { }
982};
983
984static struct ctl_table s390dbf_dir_table[] = {
985 {
986 .procname = "s390dbf",
987 .maxlen = 0,
988 .mode = S_IRUGO | S_IXUGO,
989 .child = s390dbf_table,
990 },
991 { }
992};
993
994static struct ctl_table_header *s390dbf_sysctl_header;
995
996/**
997 * debug_stop_all() - stops the debug feature if stopping is allowed.
998 *
999 * Return:
1000 * - none
1001 *
1002 * Currently used in case of a kernel oops.
1003 */
1004void debug_stop_all(void)
1005{
1006 if (debug_stoppable)
1007 debug_active = 0;
1008}
1009EXPORT_SYMBOL(debug_stop_all);
1010
1011/**
1012 * debug_set_critical() - event/exception functions try lock instead of spin.
1013 *
1014 * Return:
1015 * - none
1016 *
1017 * Currently used in case of stopping all CPUs but the current one.
1018 * Once in this state, functions to write a debug entry for an
1019 * event or exception no longer spin on the debug area lock,
1020 * but only try to get it and fail if they do not get the lock.
1021 */
1022void debug_set_critical(void)
1023{
1024 debug_critical = 1;
1025}
1026
1027/*
1028 * debug_event_common:
1029 * - write debug entry with given size
1030 */
1031debug_entry_t *debug_event_common(debug_info_t *id, int level, const void *buf,
1032 int len)
1033{
1034 debug_entry_t *active;
1035 unsigned long flags;
1036
1037 if (!debug_active || !id->areas)
1038 return NULL;
1039 if (debug_critical) {
1040 if (!spin_trylock_irqsave(&id->lock, flags))
1041 return NULL;
1042 } else {
1043 spin_lock_irqsave(&id->lock, flags);
1044 }
1045 do {
1046 active = get_active_entry(id);
1047 memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size));
1048 if (len < id->buf_size)
1049 memset((DEBUG_DATA(active)) + len, 0, id->buf_size - len);
1050 debug_finish_entry(id, active, level, 0);
1051 len -= id->buf_size;
1052 buf += id->buf_size;
1053 } while (len > 0);
1054
1055 spin_unlock_irqrestore(&id->lock, flags);
1056 return active;
1057}
1058EXPORT_SYMBOL(debug_event_common);
1059
1060/*
1061 * debug_exception_common:
1062 * - write debug entry with given size and switch to next debug area
1063 */
1064debug_entry_t *debug_exception_common(debug_info_t *id, int level,
1065 const void *buf, int len)
1066{
1067 debug_entry_t *active;
1068 unsigned long flags;
1069
1070 if (!debug_active || !id->areas)
1071 return NULL;
1072 if (debug_critical) {
1073 if (!spin_trylock_irqsave(&id->lock, flags))
1074 return NULL;
1075 } else {
1076 spin_lock_irqsave(&id->lock, flags);
1077 }
1078 do {
1079 active = get_active_entry(id);
1080 memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size));
1081 if (len < id->buf_size)
1082 memset((DEBUG_DATA(active)) + len, 0, id->buf_size - len);
1083 debug_finish_entry(id, active, level, len <= id->buf_size);
1084 len -= id->buf_size;
1085 buf += id->buf_size;
1086 } while (len > 0);
1087
1088 spin_unlock_irqrestore(&id->lock, flags);
1089 return active;
1090}
1091EXPORT_SYMBOL(debug_exception_common);
1092
1093/*
1094 * counts arguments in format string for sprintf view
1095 */
1096static inline int debug_count_numargs(char *string)
1097{
1098 int numargs = 0;
1099
1100 while (*string) {
1101 if (*string++ == '%')
1102 numargs++;
1103 }
1104 return numargs;
1105}
1106
1107/*
1108 * debug_sprintf_event:
1109 */
1110debug_entry_t *__debug_sprintf_event(debug_info_t *id, int level, char *string, ...)
1111{
1112 debug_sprintf_entry_t *curr_event;
1113 debug_entry_t *active;
1114 unsigned long flags;
1115 int numargs, idx;
1116 va_list ap;
1117
1118 if (!debug_active || !id->areas)
1119 return NULL;
1120 numargs = debug_count_numargs(string);
1121
1122 if (debug_critical) {
1123 if (!spin_trylock_irqsave(&id->lock, flags))
1124 return NULL;
1125 } else {
1126 spin_lock_irqsave(&id->lock, flags);
1127 }
1128 active = get_active_entry(id);
1129 curr_event = (debug_sprintf_entry_t *) DEBUG_DATA(active);
1130 va_start(ap, string);
1131 curr_event->string = string;
1132 for (idx = 0; idx < min(numargs, (int)(id->buf_size / sizeof(long)) - 1); idx++)
1133 curr_event->args[idx] = va_arg(ap, long);
1134 va_end(ap);
1135 debug_finish_entry(id, active, level, 0);
1136 spin_unlock_irqrestore(&id->lock, flags);
1137
1138 return active;
1139}
1140EXPORT_SYMBOL(__debug_sprintf_event);
1141
1142/*
1143 * debug_sprintf_exception:
1144 */
1145debug_entry_t *__debug_sprintf_exception(debug_info_t *id, int level, char *string, ...)
1146{
1147 debug_sprintf_entry_t *curr_event;
1148 debug_entry_t *active;
1149 unsigned long flags;
1150 int numargs, idx;
1151 va_list ap;
1152
1153 if (!debug_active || !id->areas)
1154 return NULL;
1155
1156 numargs = debug_count_numargs(string);
1157
1158 if (debug_critical) {
1159 if (!spin_trylock_irqsave(&id->lock, flags))
1160 return NULL;
1161 } else {
1162 spin_lock_irqsave(&id->lock, flags);
1163 }
1164 active = get_active_entry(id);
1165 curr_event = (debug_sprintf_entry_t *)DEBUG_DATA(active);
1166 va_start(ap, string);
1167 curr_event->string = string;
1168 for (idx = 0; idx < min(numargs, (int)(id->buf_size / sizeof(long)) - 1); idx++)
1169 curr_event->args[idx] = va_arg(ap, long);
1170 va_end(ap);
1171 debug_finish_entry(id, active, level, 1);
1172 spin_unlock_irqrestore(&id->lock, flags);
1173
1174 return active;
1175}
1176EXPORT_SYMBOL(__debug_sprintf_exception);
1177
1178/**
1179 * debug_register_view() - registers new debug view and creates debugfs
1180 * dir entry
1181 *
1182 * @id: handle for debug log
1183 * @view: pointer to debug view struct
1184 *
1185 * Return:
1186 * - 0 : ok
1187 * - < 0: Error
1188 */
1189int debug_register_view(debug_info_t *id, struct debug_view *view)
1190{
1191 unsigned long flags;
1192 struct dentry *pde;
1193 umode_t mode;
1194 int rc = 0;
1195 int i;
1196
1197 if (!id)
1198 goto out;
1199 mode = (id->mode | S_IFREG) & ~S_IXUGO;
1200 if (!(view->prolog_proc || view->format_proc || view->header_proc))
1201 mode &= ~(S_IRUSR | S_IRGRP | S_IROTH);
1202 if (!view->input_proc)
1203 mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
1204 pde = debugfs_create_file(view->name, mode, id->debugfs_root_entry,
1205 id, &debug_file_ops);
1206 spin_lock_irqsave(&id->lock, flags);
1207 for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
1208 if (!id->views[i])
1209 break;
1210 }
1211 if (i == DEBUG_MAX_VIEWS) {
1212 rc = -1;
1213 } else {
1214 id->views[i] = view;
1215 id->debugfs_entries[i] = pde;
1216 }
1217 spin_unlock_irqrestore(&id->lock, flags);
1218 if (rc) {
1219 pr_err("Registering view %s/%s would exceed the maximum "
1220 "number of views %i\n", id->name, view->name, i);
1221 debugfs_remove(pde);
1222 }
1223out:
1224 return rc;
1225}
1226EXPORT_SYMBOL(debug_register_view);
1227
1228/**
1229 * debug_unregister_view() - unregisters debug view and removes debugfs
1230 * dir entry
1231 *
1232 * @id: handle for debug log
1233 * @view: pointer to debug view struct
1234 *
1235 * Return:
1236 * - 0 : ok
1237 * - < 0: Error
1238 */
1239int debug_unregister_view(debug_info_t *id, struct debug_view *view)
1240{
1241 struct dentry *dentry = NULL;
1242 unsigned long flags;
1243 int i, rc = 0;
1244
1245 if (!id)
1246 goto out;
1247 spin_lock_irqsave(&id->lock, flags);
1248 for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
1249 if (id->views[i] == view)
1250 break;
1251 }
1252 if (i == DEBUG_MAX_VIEWS) {
1253 rc = -1;
1254 } else {
1255 dentry = id->debugfs_entries[i];
1256 id->views[i] = NULL;
1257 id->debugfs_entries[i] = NULL;
1258 }
1259 spin_unlock_irqrestore(&id->lock, flags);
1260 debugfs_remove(dentry);
1261out:
1262 return rc;
1263}
1264EXPORT_SYMBOL(debug_unregister_view);
1265
1266static inline char *debug_get_user_string(const char __user *user_buf,
1267 size_t user_len)
1268{
1269 char *buffer;
1270
1271 buffer = kmalloc(user_len + 1, GFP_KERNEL);
1272 if (!buffer)
1273 return ERR_PTR(-ENOMEM);
1274 if (copy_from_user(buffer, user_buf, user_len) != 0) {
1275 kfree(buffer);
1276 return ERR_PTR(-EFAULT);
1277 }
1278 /* got the string, now strip linefeed. */
1279 if (buffer[user_len - 1] == '\n')
1280 buffer[user_len - 1] = 0;
1281 else
1282 buffer[user_len] = 0;
1283 return buffer;
1284}
1285
1286static inline int debug_get_uint(char *buf)
1287{
1288 int rc;
1289
1290 buf = skip_spaces(buf);
1291 rc = simple_strtoul(buf, &buf, 10);
1292 if (*buf)
1293 rc = -EINVAL;
1294 return rc;
1295}
1296
1297/*
1298 * functions for debug-views
1299 ***********************************
1300*/
1301
1302/*
1303 * prints out actual debug level
1304 */
1305
1306static int debug_prolog_pages_fn(debug_info_t *id, struct debug_view *view,
1307 char *out_buf)
1308{
1309 return sprintf(out_buf, "%i\n", id->pages_per_area);
1310}
1311
1312/*
1313 * reads new size (number of pages per debug area)
1314 */
1315
1316static int debug_input_pages_fn(debug_info_t *id, struct debug_view *view,
1317 struct file *file, const char __user *user_buf,
1318 size_t user_len, loff_t *offset)
1319{
1320 int rc, new_pages;
1321 char *str;
1322
1323 if (user_len > 0x10000)
1324 user_len = 0x10000;
1325 if (*offset != 0) {
1326 rc = -EPIPE;
1327 goto out;
1328 }
1329 str = debug_get_user_string(user_buf, user_len);
1330 if (IS_ERR(str)) {
1331 rc = PTR_ERR(str);
1332 goto out;
1333 }
1334 new_pages = debug_get_uint(str);
1335 if (new_pages < 0) {
1336 rc = -EINVAL;
1337 goto free_str;
1338 }
1339 rc = debug_set_size(id, id->nr_areas, new_pages);
1340 if (rc != 0) {
1341 rc = -EINVAL;
1342 goto free_str;
1343 }
1344 rc = user_len;
1345free_str:
1346 kfree(str);
1347out:
1348 *offset += user_len;
1349 return rc; /* number of input characters */
1350}
1351
1352/*
1353 * prints out actual debug level
1354 */
1355static int debug_prolog_level_fn(debug_info_t *id, struct debug_view *view,
1356 char *out_buf)
1357{
1358 int rc = 0;
1359
1360 if (id->level == DEBUG_OFF_LEVEL)
1361 rc = sprintf(out_buf, "-\n");
1362 else
1363 rc = sprintf(out_buf, "%i\n", id->level);
1364 return rc;
1365}
1366
1367/*
1368 * reads new debug level
1369 */
1370static int debug_input_level_fn(debug_info_t *id, struct debug_view *view,
1371 struct file *file, const char __user *user_buf,
1372 size_t user_len, loff_t *offset)
1373{
1374 int rc, new_level;
1375 char *str;
1376
1377 if (user_len > 0x10000)
1378 user_len = 0x10000;
1379 if (*offset != 0) {
1380 rc = -EPIPE;
1381 goto out;
1382 }
1383 str = debug_get_user_string(user_buf, user_len);
1384 if (IS_ERR(str)) {
1385 rc = PTR_ERR(str);
1386 goto out;
1387 }
1388 if (str[0] == '-') {
1389 debug_set_level(id, DEBUG_OFF_LEVEL);
1390 rc = user_len;
1391 goto free_str;
1392 } else {
1393 new_level = debug_get_uint(str);
1394 }
1395 if (new_level < 0) {
1396 pr_warn("%s is not a valid level for a debug feature\n", str);
1397 rc = -EINVAL;
1398 } else {
1399 debug_set_level(id, new_level);
1400 rc = user_len;
1401 }
1402free_str:
1403 kfree(str);
1404out:
1405 *offset += user_len;
1406 return rc; /* number of input characters */
1407}
1408
1409/*
1410 * flushes debug areas
1411 */
1412static void debug_flush(debug_info_t *id, int area)
1413{
1414 unsigned long flags;
1415 int i, j;
1416
1417 if (!id || !id->areas)
1418 return;
1419 spin_lock_irqsave(&id->lock, flags);
1420 if (area == DEBUG_FLUSH_ALL) {
1421 id->active_area = 0;
1422 memset(id->active_entries, 0, id->nr_areas * sizeof(int));
1423 for (i = 0; i < id->nr_areas; i++) {
1424 id->active_pages[i] = 0;
1425 for (j = 0; j < id->pages_per_area; j++)
1426 memset(id->areas[i][j], 0, PAGE_SIZE);
1427 }
1428 } else if (area >= 0 && area < id->nr_areas) {
1429 id->active_entries[area] = 0;
1430 id->active_pages[area] = 0;
1431 for (i = 0; i < id->pages_per_area; i++)
1432 memset(id->areas[area][i], 0, PAGE_SIZE);
1433 }
1434 spin_unlock_irqrestore(&id->lock, flags);
1435}
1436
1437/*
1438 * view function: flushes debug areas
1439 */
1440static int debug_input_flush_fn(debug_info_t *id, struct debug_view *view,
1441 struct file *file, const char __user *user_buf,
1442 size_t user_len, loff_t *offset)
1443{
1444 char input_buf[1];
1445 int rc = user_len;
1446
1447 if (user_len > 0x10000)
1448 user_len = 0x10000;
1449 if (*offset != 0) {
1450 rc = -EPIPE;
1451 goto out;
1452 }
1453 if (copy_from_user(input_buf, user_buf, 1)) {
1454 rc = -EFAULT;
1455 goto out;
1456 }
1457 if (input_buf[0] == '-') {
1458 debug_flush(id, DEBUG_FLUSH_ALL);
1459 goto out;
1460 }
1461 if (isdigit(input_buf[0])) {
1462 int area = ((int) input_buf[0] - (int) '0');
1463
1464 debug_flush(id, area);
1465 goto out;
1466 }
1467
1468 pr_info("Flushing debug data failed because %c is not a valid "
1469 "area\n", input_buf[0]);
1470
1471out:
1472 *offset += user_len;
1473 return rc; /* number of input characters */
1474}
1475
1476/*
1477 * prints debug data in hex/ascii format
1478 */
1479static int debug_hex_ascii_format_fn(debug_info_t *id, struct debug_view *view,
1480 char *out_buf, const char *in_buf)
1481{
1482 int i, rc = 0;
1483
1484 for (i = 0; i < id->buf_size; i++)
1485 rc += sprintf(out_buf + rc, "%02x ", ((unsigned char *) in_buf)[i]);
1486 rc += sprintf(out_buf + rc, "| ");
1487 for (i = 0; i < id->buf_size; i++) {
1488 unsigned char c = in_buf[i];
1489
1490 if (isascii(c) && isprint(c))
1491 rc += sprintf(out_buf + rc, "%c", c);
1492 else
1493 rc += sprintf(out_buf + rc, ".");
1494 }
1495 rc += sprintf(out_buf + rc, "\n");
1496 return rc;
1497}
1498
1499/*
1500 * prints header for debug entry
1501 */
1502int debug_dflt_header_fn(debug_info_t *id, struct debug_view *view,
1503 int area, debug_entry_t *entry, char *out_buf)
1504{
1505 unsigned long sec, usec;
1506 unsigned long caller;
1507 unsigned int level;
1508 char *except_str;
1509 int rc = 0;
1510
1511 level = entry->level;
1512 sec = entry->clock;
1513 usec = do_div(sec, USEC_PER_SEC);
1514
1515 if (entry->exception)
1516 except_str = "*";
1517 else
1518 except_str = "-";
1519 caller = (unsigned long) entry->caller;
1520 rc += sprintf(out_buf, "%02i %011ld:%06lu %1u %1s %04u %px ",
1521 area, sec, usec, level, except_str,
1522 entry->cpu, (void *)caller);
1523 return rc;
1524}
1525EXPORT_SYMBOL(debug_dflt_header_fn);
1526
1527/*
1528 * prints debug data sprintf-formated:
1529 * debug_sprinf_event/exception calls must be used together with this view
1530 */
1531
1532#define DEBUG_SPRINTF_MAX_ARGS 10
1533
1534static int debug_sprintf_format_fn(debug_info_t *id, struct debug_view *view,
1535 char *out_buf, const char *inbuf)
1536{
1537 debug_sprintf_entry_t *curr_event = (debug_sprintf_entry_t *)inbuf;
1538 int num_longs, num_used_args = 0, i, rc = 0;
1539 int index[DEBUG_SPRINTF_MAX_ARGS];
1540
1541 /* count of longs fit into one entry */
1542 num_longs = id->buf_size / sizeof(long);
1543
1544 if (num_longs < 1)
1545 goto out; /* bufsize of entry too small */
1546 if (num_longs == 1) {
1547 /* no args, we use only the string */
1548 strcpy(out_buf, curr_event->string);
1549 rc = strlen(curr_event->string);
1550 goto out;
1551 }
1552
1553 /* number of arguments used for sprintf (without the format string) */
1554 num_used_args = min(DEBUG_SPRINTF_MAX_ARGS, (num_longs - 1));
1555
1556 memset(index, 0, DEBUG_SPRINTF_MAX_ARGS * sizeof(int));
1557
1558 for (i = 0; i < num_used_args; i++)
1559 index[i] = i;
1560
1561 rc = sprintf(out_buf, curr_event->string, curr_event->args[index[0]],
1562 curr_event->args[index[1]], curr_event->args[index[2]],
1563 curr_event->args[index[3]], curr_event->args[index[4]],
1564 curr_event->args[index[5]], curr_event->args[index[6]],
1565 curr_event->args[index[7]], curr_event->args[index[8]],
1566 curr_event->args[index[9]]);
1567out:
1568 return rc;
1569}
1570
1571/*
1572 * debug_init:
1573 * - is called exactly once to initialize the debug feature
1574 */
1575static int __init debug_init(void)
1576{
1577 s390dbf_sysctl_header = register_sysctl_table(s390dbf_dir_table);
1578 mutex_lock(&debug_mutex);
1579 debug_debugfs_root_entry = debugfs_create_dir(DEBUG_DIR_ROOT, NULL);
1580 initialized = 1;
1581 mutex_unlock(&debug_mutex);
1582 return 0;
1583}
1584postcore_initcall(debug_init);
1/*
2 * S/390 debug facility
3 *
4 * Copyright IBM Corp. 1999, 2012
5 *
6 * Author(s): Michael Holzheu (holzheu@de.ibm.com),
7 * Holger Smolinski (Holger.Smolinski@de.ibm.com)
8 *
9 * Bugreports to: <Linux390@de.ibm.com>
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 /* copy all debug areas */
33#define NO_AREAS 1 /* copy no debug areas */
34
35/* typedefs */
36
37typedef struct file_private_info {
38 loff_t offset; /* offset of last read in file */
39 int act_area; /* number of last formated area */
40 int act_page; /* act page in given area */
41 int act_entry; /* last formated entry (offset */
42 /* relative to beginning of last */
43 /* formated page) */
44 size_t act_entry_offset; /* up to this offset we copied */
45 /* in last read the last formated */
46 /* entry to userland */
47 char temp_buf[2048]; /* buffer for output */
48 debug_info_t *debug_info_org; /* original debug information */
49 debug_info_t *debug_info_snap; /* snapshot of debug information */
50 struct debug_view *view; /* used view of debug info */
51} file_private_info_t;
52
53typedef struct
54{
55 char *string;
56 /*
57 * This assumes that all args are converted into longs
58 * on L/390 this is the case for all types of parameter
59 * except of floats, and long long (32 bit)
60 *
61 */
62 long args[0];
63} debug_sprintf_entry_t;
64
65
66/* internal function prototyes */
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/* globals */
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/* used by dump analysis tools to determine version of debug feature */
163static unsigned int __used debug_feature_version = __DEBUG_FEATURE_VERSION;
164
165/* static globals */
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/* functions */
186
187/*
188 * debug_areas_alloc
189 * - Debug areas are implemented as a threedimensonal array:
190 * areas[areanumber][pagenumber][pageoffset]
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 * debug_info_alloc
239 * - alloc new debug-info
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 /* alloc everything */
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 /* initialize members */
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 * debug_areas_free
296 * - free all debug areas
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 * debug_info_free
318 * - free memory debug-info
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 * debug_info_create
331 * - create new debug-info
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 /* create root directory */
348 rc->debugfs_root_entry = debugfs_create_dir(rc->name,
349 debug_debugfs_root_entry);
350
351 /* append new element to linked list */
352 if (!debug_area_first) {
353 /* first element in list */
354 debug_area_first = rc;
355 rc->prev = NULL;
356 } else {
357 /* append element to end of list */
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 * debug_info_copy
371 * - copy debug-info
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 /* get a consistent copy of the debug areas */
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 /* has something changed in the meantime ? */
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 * debug_info_get
412 * - increments reference count for debug-info
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 * debug_info_put:
424 * - decreases reference count for debug-info and frees it if necessary
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 * debug_format_entry:
453 * - format one debug entry and return size of formated data
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 /* print prolog */
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) /* this is true, if we have a prolog only view */
470 goto out; /* or if 'pages_per_area' is 0 */
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; /* empty entry */
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 * debug_next_entry:
488 * - goto next entry in p_info
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 /* switch to next page, if we reached the end of the page */
506 if (p_info->act_entry > (PAGE_SIZE - id->entry_size)){
507 /* next page */
508 p_info->act_entry = 0;
509 p_info->act_page += 1;
510 if((p_info->act_page % id->pages_per_area) == 0) {
511 /* next area */
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 * debug_output:
524 * - called for user read()
525 * - copies formated debug entries to the user buffer
526 */
527
528static ssize_t
529debug_output(struct file *file, /* file descriptor */
530 char __user *user_buf, /* user buffer */
531 size_t len, /* length of buffer */
532 loff_t *offset) /* offset in the file */
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 * debug_input:
576 * - called for user write()
577 * - calls input function of view
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; /* number of input characters */
597}
598
599/*
600 * debug_open:
601 * - called for user open()
602 * - copies formated output to private_data area of the file
603 * handle
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 /* find debug view */
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; /* found view ! */
622 }
623 }
624 /* no entry found */
625 rc = -EINVAL;
626 goto out;
627
628found:
629
630 /* Make snapshot of current debug areas to get it consistent. */
631 /* To copy all the areas is only needed, if we have a view which */
632 /* formats the debug areas. */
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 * debug_close:
670 * - called for user close()
671 * - deletes private_data area of the file handle
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; /* success */
684}
685
686/*
687 * debug_register_mode:
688 * - Creates and initializes debug area for the caller
689 * The mode parameter allows to specify access rights for the s390dbf files
690 * - Returns handle for debug area
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 /* Since debugfs currently does not support uid/gid other than root, */
700 /* we do not allow gid/uid != 0 until we get support for that. */
701 if ((uid != 0) || (gid != 0))
702 pr_warning("Root becomes the owner of all s390dbf files "
703 "in sysfs\n");
704 BUG_ON(!initialized);
705 mutex_lock(&debug_mutex);
706
707 /* create new debug_info */
708
709 rc = debug_info_create(name, pages_per_area, nr_areas, buf_size, mode);
710 if(!rc)
711 goto out;
712 debug_register_view(rc, &debug_level_view);
713 debug_register_view(rc, &debug_flush_view);
714 debug_register_view(rc, &debug_pages_view);
715out:
716 if (!rc){
717 pr_err("Registering debug feature %s failed\n", name);
718 }
719 mutex_unlock(&debug_mutex);
720 return rc;
721}
722EXPORT_SYMBOL(debug_register_mode);
723
724/*
725 * debug_register:
726 * - creates and initializes debug area for the caller
727 * - returns handle for debug area
728 */
729
730debug_info_t *debug_register(const char *name, int pages_per_area,
731 int nr_areas, int buf_size)
732{
733 return debug_register_mode(name, pages_per_area, nr_areas, buf_size,
734 S_IRUSR | S_IWUSR, 0, 0);
735}
736EXPORT_SYMBOL(debug_register);
737
738/*
739 * debug_unregister:
740 * - give back debug area
741 */
742
743void
744debug_unregister(debug_info_t * id)
745{
746 if (!id)
747 goto out;
748 mutex_lock(&debug_mutex);
749 debug_info_put(id);
750 mutex_unlock(&debug_mutex);
751
752out:
753 return;
754}
755EXPORT_SYMBOL(debug_unregister);
756
757/*
758 * debug_set_size:
759 * - set area size (number of pages) and number of areas
760 */
761static int
762debug_set_size(debug_info_t* id, int nr_areas, int pages_per_area)
763{
764 unsigned long flags;
765 debug_entry_t *** new_areas;
766 int rc=0;
767
768 if(!id || (nr_areas <= 0) || (pages_per_area < 0))
769 return -EINVAL;
770 if(pages_per_area > 0){
771 new_areas = debug_areas_alloc(pages_per_area, nr_areas);
772 if(!new_areas) {
773 pr_info("Allocating memory for %i pages failed\n",
774 pages_per_area);
775 rc = -ENOMEM;
776 goto out;
777 }
778 } else {
779 new_areas = NULL;
780 }
781 spin_lock_irqsave(&id->lock,flags);
782 debug_areas_free(id);
783 id->areas = new_areas;
784 id->nr_areas = nr_areas;
785 id->pages_per_area = pages_per_area;
786 id->active_area = 0;
787 memset(id->active_entries,0,sizeof(int)*id->nr_areas);
788 memset(id->active_pages, 0, sizeof(int)*id->nr_areas);
789 spin_unlock_irqrestore(&id->lock,flags);
790 pr_info("%s: set new size (%i pages)\n" ,id->name, pages_per_area);
791out:
792 return rc;
793}
794
795/*
796 * debug_set_level:
797 * - set actual debug level
798 */
799
800void
801debug_set_level(debug_info_t* id, int new_level)
802{
803 unsigned long flags;
804 if(!id)
805 return;
806 spin_lock_irqsave(&id->lock,flags);
807 if(new_level == DEBUG_OFF_LEVEL){
808 id->level = DEBUG_OFF_LEVEL;
809 pr_info("%s: switched off\n",id->name);
810 } else if ((new_level > DEBUG_MAX_LEVEL) || (new_level < 0)) {
811 pr_info("%s: level %i is out of range (%i - %i)\n",
812 id->name, new_level, 0, DEBUG_MAX_LEVEL);
813 } else {
814 id->level = new_level;
815 }
816 spin_unlock_irqrestore(&id->lock,flags);
817}
818EXPORT_SYMBOL(debug_set_level);
819
820/*
821 * proceed_active_entry:
822 * - set active entry to next in the ring buffer
823 */
824
825static inline void
826proceed_active_entry(debug_info_t * id)
827{
828 if ((id->active_entries[id->active_area] += id->entry_size)
829 > (PAGE_SIZE - id->entry_size)){
830 id->active_entries[id->active_area] = 0;
831 id->active_pages[id->active_area] =
832 (id->active_pages[id->active_area] + 1) %
833 id->pages_per_area;
834 }
835}
836
837/*
838 * proceed_active_area:
839 * - set active area to next in the ring buffer
840 */
841
842static inline void
843proceed_active_area(debug_info_t * id)
844{
845 id->active_area++;
846 id->active_area = id->active_area % id->nr_areas;
847}
848
849/*
850 * get_active_entry:
851 */
852
853static inline debug_entry_t*
854get_active_entry(debug_info_t * id)
855{
856 return (debug_entry_t *) (((char *) id->areas[id->active_area]
857 [id->active_pages[id->active_area]]) +
858 id->active_entries[id->active_area]);
859}
860
861/*
862 * debug_finish_entry:
863 * - set timestamp, caller address, cpu number etc.
864 */
865
866static inline void
867debug_finish_entry(debug_info_t * id, debug_entry_t* active, int level,
868 int exception)
869{
870 active->id.stck = get_tod_clock_fast();
871 active->id.fields.cpuid = smp_processor_id();
872 active->caller = __builtin_return_address(0);
873 active->id.fields.exception = exception;
874 active->id.fields.level = level;
875 proceed_active_entry(id);
876 if(exception)
877 proceed_active_area(id);
878}
879
880static int debug_stoppable=1;
881static int debug_active=1;
882
883#define CTL_S390DBF_STOPPABLE 5678
884#define CTL_S390DBF_ACTIVE 5679
885
886/*
887 * proc handler for the running debug_active sysctl
888 * always allow read, allow write only if debug_stoppable is set or
889 * if debug_active is already off
890 */
891static int
892s390dbf_procactive(struct ctl_table *table, int write,
893 void __user *buffer, size_t *lenp, loff_t *ppos)
894{
895 if (!write || debug_stoppable || !debug_active)
896 return proc_dointvec(table, write, buffer, lenp, ppos);
897 else
898 return 0;
899}
900
901
902static struct ctl_table s390dbf_table[] = {
903 {
904 .procname = "debug_stoppable",
905 .data = &debug_stoppable,
906 .maxlen = sizeof(int),
907 .mode = S_IRUGO | S_IWUSR,
908 .proc_handler = proc_dointvec,
909 },
910 {
911 .procname = "debug_active",
912 .data = &debug_active,
913 .maxlen = sizeof(int),
914 .mode = S_IRUGO | S_IWUSR,
915 .proc_handler = s390dbf_procactive,
916 },
917 { }
918};
919
920static struct ctl_table s390dbf_dir_table[] = {
921 {
922 .procname = "s390dbf",
923 .maxlen = 0,
924 .mode = S_IRUGO | S_IXUGO,
925 .child = s390dbf_table,
926 },
927 { }
928};
929
930static struct ctl_table_header *s390dbf_sysctl_header;
931
932void
933debug_stop_all(void)
934{
935 if (debug_stoppable)
936 debug_active = 0;
937}
938EXPORT_SYMBOL(debug_stop_all);
939
940void debug_set_critical(void)
941{
942 debug_critical = 1;
943}
944
945/*
946 * debug_event_common:
947 * - write debug entry with given size
948 */
949
950debug_entry_t*
951debug_event_common(debug_info_t * id, int level, const void *buf, int len)
952{
953 unsigned long flags;
954 debug_entry_t *active;
955
956 if (!debug_active || !id->areas)
957 return NULL;
958 if (debug_critical) {
959 if (!spin_trylock_irqsave(&id->lock, flags))
960 return NULL;
961 } else
962 spin_lock_irqsave(&id->lock, flags);
963 active = get_active_entry(id);
964 memset(DEBUG_DATA(active), 0, id->buf_size);
965 memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size));
966 debug_finish_entry(id, active, level, 0);
967 spin_unlock_irqrestore(&id->lock, flags);
968
969 return active;
970}
971EXPORT_SYMBOL(debug_event_common);
972
973/*
974 * debug_exception_common:
975 * - write debug entry with given size and switch to next debug area
976 */
977
978debug_entry_t
979*debug_exception_common(debug_info_t * id, int level, const void *buf, int len)
980{
981 unsigned long flags;
982 debug_entry_t *active;
983
984 if (!debug_active || !id->areas)
985 return NULL;
986 if (debug_critical) {
987 if (!spin_trylock_irqsave(&id->lock, flags))
988 return NULL;
989 } else
990 spin_lock_irqsave(&id->lock, flags);
991 active = get_active_entry(id);
992 memset(DEBUG_DATA(active), 0, id->buf_size);
993 memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size));
994 debug_finish_entry(id, active, level, 1);
995 spin_unlock_irqrestore(&id->lock, flags);
996
997 return active;
998}
999EXPORT_SYMBOL(debug_exception_common);
1000
1001/*
1002 * counts arguments in format string for sprintf view
1003 */
1004
1005static inline int
1006debug_count_numargs(char *string)
1007{
1008 int numargs=0;
1009
1010 while(*string) {
1011 if(*string++=='%')
1012 numargs++;
1013 }
1014 return(numargs);
1015}
1016
1017/*
1018 * debug_sprintf_event:
1019 */
1020
1021debug_entry_t*
1022debug_sprintf_event(debug_info_t* id, int level,char *string,...)
1023{
1024 va_list ap;
1025 int numargs,idx;
1026 unsigned long flags;
1027 debug_sprintf_entry_t *curr_event;
1028 debug_entry_t *active;
1029
1030 if((!id) || (level > id->level))
1031 return NULL;
1032 if (!debug_active || !id->areas)
1033 return NULL;
1034 numargs=debug_count_numargs(string);
1035
1036 if (debug_critical) {
1037 if (!spin_trylock_irqsave(&id->lock, flags))
1038 return NULL;
1039 } else
1040 spin_lock_irqsave(&id->lock, flags);
1041 active = get_active_entry(id);
1042 curr_event=(debug_sprintf_entry_t *) DEBUG_DATA(active);
1043 va_start(ap,string);
1044 curr_event->string=string;
1045 for(idx=0;idx<min(numargs,(int)(id->buf_size / sizeof(long))-1);idx++)
1046 curr_event->args[idx]=va_arg(ap,long);
1047 va_end(ap);
1048 debug_finish_entry(id, active, level, 0);
1049 spin_unlock_irqrestore(&id->lock, flags);
1050
1051 return active;
1052}
1053EXPORT_SYMBOL(debug_sprintf_event);
1054
1055/*
1056 * debug_sprintf_exception:
1057 */
1058
1059debug_entry_t*
1060debug_sprintf_exception(debug_info_t* id, int level,char *string,...)
1061{
1062 va_list ap;
1063 int numargs,idx;
1064 unsigned long flags;
1065 debug_sprintf_entry_t *curr_event;
1066 debug_entry_t *active;
1067
1068 if((!id) || (level > id->level))
1069 return NULL;
1070 if (!debug_active || !id->areas)
1071 return NULL;
1072
1073 numargs=debug_count_numargs(string);
1074
1075 if (debug_critical) {
1076 if (!spin_trylock_irqsave(&id->lock, flags))
1077 return NULL;
1078 } else
1079 spin_lock_irqsave(&id->lock, flags);
1080 active = get_active_entry(id);
1081 curr_event=(debug_sprintf_entry_t *)DEBUG_DATA(active);
1082 va_start(ap,string);
1083 curr_event->string=string;
1084 for(idx=0;idx<min(numargs,(int)(id->buf_size / sizeof(long))-1);idx++)
1085 curr_event->args[idx]=va_arg(ap,long);
1086 va_end(ap);
1087 debug_finish_entry(id, active, level, 1);
1088 spin_unlock_irqrestore(&id->lock, flags);
1089
1090 return active;
1091}
1092EXPORT_SYMBOL(debug_sprintf_exception);
1093
1094/*
1095 * debug_register_view:
1096 */
1097
1098int
1099debug_register_view(debug_info_t * id, struct debug_view *view)
1100{
1101 int rc = 0;
1102 int i;
1103 unsigned long flags;
1104 umode_t mode;
1105 struct dentry *pde;
1106
1107 if (!id)
1108 goto out;
1109 mode = (id->mode | S_IFREG) & ~S_IXUGO;
1110 if (!(view->prolog_proc || view->format_proc || view->header_proc))
1111 mode &= ~(S_IRUSR | S_IRGRP | S_IROTH);
1112 if (!view->input_proc)
1113 mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
1114 pde = debugfs_create_file(view->name, mode, id->debugfs_root_entry,
1115 id , &debug_file_ops);
1116 if (!pde){
1117 pr_err("Registering view %s/%s failed due to out of "
1118 "memory\n", id->name,view->name);
1119 rc = -1;
1120 goto out;
1121 }
1122 spin_lock_irqsave(&id->lock, flags);
1123 for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
1124 if (!id->views[i])
1125 break;
1126 }
1127 if (i == DEBUG_MAX_VIEWS) {
1128 pr_err("Registering view %s/%s would exceed the maximum "
1129 "number of views %i\n", id->name, view->name, i);
1130 rc = -1;
1131 } else {
1132 id->views[i] = view;
1133 id->debugfs_entries[i] = pde;
1134 }
1135 spin_unlock_irqrestore(&id->lock, flags);
1136 if (rc)
1137 debugfs_remove(pde);
1138out:
1139 return rc;
1140}
1141EXPORT_SYMBOL(debug_register_view);
1142
1143/*
1144 * debug_unregister_view:
1145 */
1146
1147int
1148debug_unregister_view(debug_info_t * id, struct debug_view *view)
1149{
1150 struct dentry *dentry = NULL;
1151 unsigned long flags;
1152 int i, rc = 0;
1153
1154 if (!id)
1155 goto out;
1156 spin_lock_irqsave(&id->lock, flags);
1157 for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
1158 if (id->views[i] == view)
1159 break;
1160 }
1161 if (i == DEBUG_MAX_VIEWS)
1162 rc = -1;
1163 else {
1164 dentry = id->debugfs_entries[i];
1165 id->views[i] = NULL;
1166 id->debugfs_entries[i] = NULL;
1167 }
1168 spin_unlock_irqrestore(&id->lock, flags);
1169 debugfs_remove(dentry);
1170out:
1171 return rc;
1172}
1173EXPORT_SYMBOL(debug_unregister_view);
1174
1175static inline char *
1176debug_get_user_string(const char __user *user_buf, size_t user_len)
1177{
1178 char* buffer;
1179
1180 buffer = kmalloc(user_len + 1, GFP_KERNEL);
1181 if (!buffer)
1182 return ERR_PTR(-ENOMEM);
1183 if (copy_from_user(buffer, user_buf, user_len) != 0) {
1184 kfree(buffer);
1185 return ERR_PTR(-EFAULT);
1186 }
1187 /* got the string, now strip linefeed. */
1188 if (buffer[user_len - 1] == '\n')
1189 buffer[user_len - 1] = 0;
1190 else
1191 buffer[user_len] = 0;
1192 return buffer;
1193}
1194
1195static inline int
1196debug_get_uint(char *buf)
1197{
1198 int rc;
1199
1200 buf = skip_spaces(buf);
1201 rc = simple_strtoul(buf, &buf, 10);
1202 if(*buf){
1203 rc = -EINVAL;
1204 }
1205 return rc;
1206}
1207
1208/*
1209 * functions for debug-views
1210 ***********************************
1211*/
1212
1213/*
1214 * prints out actual debug level
1215 */
1216
1217static int
1218debug_prolog_pages_fn(debug_info_t * id,
1219 struct debug_view *view, char *out_buf)
1220{
1221 return sprintf(out_buf, "%i\n", id->pages_per_area);
1222}
1223
1224/*
1225 * reads new size (number of pages per debug area)
1226 */
1227
1228static int
1229debug_input_pages_fn(debug_info_t * id, struct debug_view *view,
1230 struct file *file, const char __user *user_buf,
1231 size_t user_len, loff_t * offset)
1232{
1233 char *str;
1234 int rc,new_pages;
1235
1236 if (user_len > 0x10000)
1237 user_len = 0x10000;
1238 if (*offset != 0){
1239 rc = -EPIPE;
1240 goto out;
1241 }
1242 str = debug_get_user_string(user_buf,user_len);
1243 if(IS_ERR(str)){
1244 rc = PTR_ERR(str);
1245 goto out;
1246 }
1247 new_pages = debug_get_uint(str);
1248 if(new_pages < 0){
1249 rc = -EINVAL;
1250 goto free_str;
1251 }
1252 rc = debug_set_size(id,id->nr_areas, new_pages);
1253 if(rc != 0){
1254 rc = -EINVAL;
1255 goto free_str;
1256 }
1257 rc = user_len;
1258free_str:
1259 kfree(str);
1260out:
1261 *offset += user_len;
1262 return rc; /* number of input characters */
1263}
1264
1265/*
1266 * prints out actual debug level
1267 */
1268
1269static int
1270debug_prolog_level_fn(debug_info_t * id, struct debug_view *view, char *out_buf)
1271{
1272 int rc = 0;
1273
1274 if(id->level == DEBUG_OFF_LEVEL) {
1275 rc = sprintf(out_buf,"-\n");
1276 }
1277 else {
1278 rc = sprintf(out_buf, "%i\n", id->level);
1279 }
1280 return rc;
1281}
1282
1283/*
1284 * reads new debug level
1285 */
1286
1287static int
1288debug_input_level_fn(debug_info_t * id, struct debug_view *view,
1289 struct file *file, const char __user *user_buf,
1290 size_t user_len, loff_t * offset)
1291{
1292 char *str;
1293 int rc,new_level;
1294
1295 if (user_len > 0x10000)
1296 user_len = 0x10000;
1297 if (*offset != 0){
1298 rc = -EPIPE;
1299 goto out;
1300 }
1301 str = debug_get_user_string(user_buf,user_len);
1302 if(IS_ERR(str)){
1303 rc = PTR_ERR(str);
1304 goto out;
1305 }
1306 if(str[0] == '-'){
1307 debug_set_level(id, DEBUG_OFF_LEVEL);
1308 rc = user_len;
1309 goto free_str;
1310 } else {
1311 new_level = debug_get_uint(str);
1312 }
1313 if(new_level < 0) {
1314 pr_warning("%s is not a valid level for a debug "
1315 "feature\n", str);
1316 rc = -EINVAL;
1317 } else {
1318 debug_set_level(id, new_level);
1319 rc = user_len;
1320 }
1321free_str:
1322 kfree(str);
1323out:
1324 *offset += user_len;
1325 return rc; /* number of input characters */
1326}
1327
1328
1329/*
1330 * flushes debug areas
1331 */
1332
1333static void debug_flush(debug_info_t* id, int area)
1334{
1335 unsigned long flags;
1336 int i,j;
1337
1338 if(!id || !id->areas)
1339 return;
1340 spin_lock_irqsave(&id->lock,flags);
1341 if(area == DEBUG_FLUSH_ALL){
1342 id->active_area = 0;
1343 memset(id->active_entries, 0, id->nr_areas * sizeof(int));
1344 for (i = 0; i < id->nr_areas; i++) {
1345 id->active_pages[i] = 0;
1346 for(j = 0; j < id->pages_per_area; j++) {
1347 memset(id->areas[i][j], 0, PAGE_SIZE);
1348 }
1349 }
1350 } else if(area >= 0 && area < id->nr_areas) {
1351 id->active_entries[area] = 0;
1352 id->active_pages[area] = 0;
1353 for(i = 0; i < id->pages_per_area; i++) {
1354 memset(id->areas[area][i],0,PAGE_SIZE);
1355 }
1356 }
1357 spin_unlock_irqrestore(&id->lock,flags);
1358}
1359
1360/*
1361 * view function: flushes debug areas
1362 */
1363
1364static int
1365debug_input_flush_fn(debug_info_t * id, struct debug_view *view,
1366 struct file *file, const char __user *user_buf,
1367 size_t user_len, loff_t * offset)
1368{
1369 char input_buf[1];
1370 int rc = user_len;
1371
1372 if (user_len > 0x10000)
1373 user_len = 0x10000;
1374 if (*offset != 0){
1375 rc = -EPIPE;
1376 goto out;
1377 }
1378 if (copy_from_user(input_buf, user_buf, 1)){
1379 rc = -EFAULT;
1380 goto out;
1381 }
1382 if(input_buf[0] == '-') {
1383 debug_flush(id, DEBUG_FLUSH_ALL);
1384 goto out;
1385 }
1386 if (isdigit(input_buf[0])) {
1387 int area = ((int) input_buf[0] - (int) '0');
1388 debug_flush(id, area);
1389 goto out;
1390 }
1391
1392 pr_info("Flushing debug data failed because %c is not a valid "
1393 "area\n", input_buf[0]);
1394
1395out:
1396 *offset += user_len;
1397 return rc; /* number of input characters */
1398}
1399
1400/*
1401 * prints debug header in raw format
1402 */
1403
1404static int
1405debug_raw_header_fn(debug_info_t * id, struct debug_view *view,
1406 int area, debug_entry_t * entry, char *out_buf)
1407{
1408 int rc;
1409
1410 rc = sizeof(debug_entry_t);
1411 memcpy(out_buf,entry,sizeof(debug_entry_t));
1412 return rc;
1413}
1414
1415/*
1416 * prints debug data in raw format
1417 */
1418
1419static int
1420debug_raw_format_fn(debug_info_t * id, struct debug_view *view,
1421 char *out_buf, const char *in_buf)
1422{
1423 int rc;
1424
1425 rc = id->buf_size;
1426 memcpy(out_buf, in_buf, id->buf_size);
1427 return rc;
1428}
1429
1430/*
1431 * prints debug data in hex/ascii format
1432 */
1433
1434static int
1435debug_hex_ascii_format_fn(debug_info_t * id, struct debug_view *view,
1436 char *out_buf, const char *in_buf)
1437{
1438 int i, rc = 0;
1439
1440 for (i = 0; i < id->buf_size; i++) {
1441 rc += sprintf(out_buf + rc, "%02x ",
1442 ((unsigned char *) in_buf)[i]);
1443 }
1444 rc += sprintf(out_buf + rc, "| ");
1445 for (i = 0; i < id->buf_size; i++) {
1446 unsigned char c = in_buf[i];
1447 if (isascii(c) && isprint(c))
1448 rc += sprintf(out_buf + rc, "%c", c);
1449 else
1450 rc += sprintf(out_buf + rc, ".");
1451 }
1452 rc += sprintf(out_buf + rc, "\n");
1453 return rc;
1454}
1455
1456/*
1457 * prints header for debug entry
1458 */
1459
1460int
1461debug_dflt_header_fn(debug_info_t * id, struct debug_view *view,
1462 int area, debug_entry_t * entry, char *out_buf)
1463{
1464 struct timespec time_spec;
1465 char *except_str;
1466 unsigned long caller;
1467 int rc = 0;
1468 unsigned int level;
1469
1470 level = entry->id.fields.level;
1471 stck_to_timespec(entry->id.stck, &time_spec);
1472
1473 if (entry->id.fields.exception)
1474 except_str = "*";
1475 else
1476 except_str = "-";
1477 caller = ((unsigned long) entry->caller) & PSW_ADDR_INSN;
1478 rc += sprintf(out_buf, "%02i %011lu:%06lu %1u %1s %02i %p ",
1479 area, time_spec.tv_sec, time_spec.tv_nsec / 1000, level,
1480 except_str, entry->id.fields.cpuid, (void *) caller);
1481 return rc;
1482}
1483EXPORT_SYMBOL(debug_dflt_header_fn);
1484
1485/*
1486 * prints debug data sprintf-formated:
1487 * debug_sprinf_event/exception calls must be used together with this view
1488 */
1489
1490#define DEBUG_SPRINTF_MAX_ARGS 10
1491
1492static int
1493debug_sprintf_format_fn(debug_info_t * id, struct debug_view *view,
1494 char *out_buf, debug_sprintf_entry_t *curr_event)
1495{
1496 int num_longs, num_used_args = 0,i, rc = 0;
1497 int index[DEBUG_SPRINTF_MAX_ARGS];
1498
1499 /* count of longs fit into one entry */
1500 num_longs = id->buf_size / sizeof(long);
1501
1502 if(num_longs < 1)
1503 goto out; /* bufsize of entry too small */
1504 if(num_longs == 1) {
1505 /* no args, we use only the string */
1506 strcpy(out_buf, curr_event->string);
1507 rc = strlen(curr_event->string);
1508 goto out;
1509 }
1510
1511 /* number of arguments used for sprintf (without the format string) */
1512 num_used_args = min(DEBUG_SPRINTF_MAX_ARGS, (num_longs - 1));
1513
1514 memset(index,0, DEBUG_SPRINTF_MAX_ARGS * sizeof(int));
1515
1516 for(i = 0; i < num_used_args; i++)
1517 index[i] = i;
1518
1519 rc = sprintf(out_buf, curr_event->string, curr_event->args[index[0]],
1520 curr_event->args[index[1]], curr_event->args[index[2]],
1521 curr_event->args[index[3]], curr_event->args[index[4]],
1522 curr_event->args[index[5]], curr_event->args[index[6]],
1523 curr_event->args[index[7]], curr_event->args[index[8]],
1524 curr_event->args[index[9]]);
1525
1526out:
1527
1528 return rc;
1529}
1530
1531/*
1532 * debug_init:
1533 * - is called exactly once to initialize the debug feature
1534 */
1535static int __init debug_init(void)
1536{
1537 s390dbf_sysctl_header = register_sysctl_table(s390dbf_dir_table);
1538 mutex_lock(&debug_mutex);
1539 debug_debugfs_root_entry = debugfs_create_dir(DEBUG_DIR_ROOT, NULL);
1540 initialized = 1;
1541 mutex_unlock(&debug_mutex);
1542 return 0;
1543}
1544postcore_initcall(debug_init);