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[CPUFREQ] fix show_trans_table
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / arch / s390 / kernel / debug.c
blobdff0568e67ec8869fa427b7769b0ca329b561650
1 /*
2 * arch/s390/kernel/debug.c
3 * S/390 debug facility
4 *
5 * Copyright (C) 1999, 2000 IBM Deutschland Entwicklung GmbH,
6 * IBM Corporation
7 * Author(s): Michael Holzheu (holzheu@de.ibm.com),
8 * Holger Smolinski (Holger.Smolinski@de.ibm.com)
9 *
10 * Bugreports to: <Linux390@de.ibm.com>
11 */
12
13 #include <linux/stddef.h>
14 #include <linux/kernel.h>
15 #include <linux/errno.h>
16 #include <linux/slab.h>
17 #include <linux/ctype.h>
18 #include <linux/sysctl.h>
19 #include <asm/uaccess.h>
20 #include <linux/module.h>
21 #include <linux/init.h>
22 #include <linux/fs.h>
23 #include <linux/debugfs.h>
24
25 #include <asm/debug.h>
26
27 #define DEBUG_PROLOG_ENTRY -1
28
29 #define ALL_AREAS 0 /* copy all debug areas */
30 #define NO_AREAS 1 /* copy no debug areas */
31
32 /* typedefs */
33
34 typedef struct file_private_info {
35 loff_t offset; /* offset of last read in file */
36 int act_area; /* number of last formated area */
37 int act_page; /* act page in given area */
38 int act_entry; /* last formated entry (offset */
39 /* relative to beginning of last */
40 /* formated page) */
41 size_t act_entry_offset; /* up to this offset we copied */
42 /* in last read the last formated */
43 /* entry to userland */
44 char temp_buf[2048]; /* buffer for output */
45 debug_info_t *debug_info_org; /* original debug information */
46 debug_info_t *debug_info_snap; /* snapshot of debug information */
47 struct debug_view *view; /* used view of debug info */
48 } file_private_info_t;
49
50 typedef struct
51 {
52 char *string;
53 /*
54 * This assumes that all args are converted into longs
55 * on L/390 this is the case for all types of parameter
56 * except of floats, and long long (32 bit)
57 *
58 */
59 long args[0];
60 } debug_sprintf_entry_t;
61
62
63 extern void tod_to_timeval(uint64_t todval, struct timespec *xtime);
64
65 /* internal function prototyes */
66
67 static int debug_init(void);
68 static ssize_t debug_output(struct file *file, char __user *user_buf,
69 size_t user_len, loff_t * offset);
70 static ssize_t debug_input(struct file *file, const char __user *user_buf,
71 size_t user_len, loff_t * offset);
72 static int debug_open(struct inode *inode, struct file *file);
73 static int debug_close(struct inode *inode, struct file *file);
74 static debug_info_t* debug_info_create(char *name, int pages_per_area,
75 int nr_areas, int buf_size, mode_t mode);
76 static void debug_info_get(debug_info_t *);
77 static void debug_info_put(debug_info_t *);
78 static int debug_prolog_level_fn(debug_info_t * id,
79 struct debug_view *view, char *out_buf);
80 static int debug_input_level_fn(debug_info_t * id, struct debug_view *view,
81 struct file *file, const char __user *user_buf,
82 size_t user_buf_size, loff_t * offset);
83 static int debug_prolog_pages_fn(debug_info_t * id,
84 struct debug_view *view, char *out_buf);
85 static int debug_input_pages_fn(debug_info_t * id, struct debug_view *view,
86 struct file *file, const char __user *user_buf,
87 size_t user_buf_size, loff_t * offset);
88 static int debug_input_flush_fn(debug_info_t * id, struct debug_view *view,
89 struct file *file, const char __user *user_buf,
90 size_t user_buf_size, loff_t * offset);
91 static int debug_hex_ascii_format_fn(debug_info_t * id, struct debug_view *view,
92 char *out_buf, const char *in_buf);
93 static int debug_raw_format_fn(debug_info_t * id,
94 struct debug_view *view, char *out_buf,
95 const char *in_buf);
96 static int debug_raw_header_fn(debug_info_t * id, struct debug_view *view,
97 int area, debug_entry_t * entry, char *out_buf);
98
99 static int debug_sprintf_format_fn(debug_info_t * id, struct debug_view *view,
100 char *out_buf, debug_sprintf_entry_t *curr_event);
101
102 /* globals */
103
104 struct debug_view debug_raw_view = {
105 "raw",
106 NULL,
107 &debug_raw_header_fn,
108 &debug_raw_format_fn,
109 NULL,
110 NULL
111 };
112
113 struct debug_view debug_hex_ascii_view = {
114 "hex_ascii",
115 NULL,
116 &debug_dflt_header_fn,
117 &debug_hex_ascii_format_fn,
118 NULL,
119 NULL
120 };
121
122 static struct debug_view debug_level_view = {
123 "level",
124 &debug_prolog_level_fn,
125 NULL,
126 NULL,
127 &debug_input_level_fn,
128 NULL
129 };
130
131 static struct debug_view debug_pages_view = {
132 "pages",
133 &debug_prolog_pages_fn,
134 NULL,
135 NULL,
136 &debug_input_pages_fn,
137 NULL
138 };
139
140 static struct debug_view debug_flush_view = {
141 "flush",
142 NULL,
143 NULL,
144 NULL,
145 &debug_input_flush_fn,
146 NULL
147 };
148
149 struct debug_view debug_sprintf_view = {
150 "sprintf",
151 NULL,
152 &debug_dflt_header_fn,
153 (debug_format_proc_t*)&debug_sprintf_format_fn,
154 NULL,
155 NULL
156 };
157
158 /* used by dump analysis tools to determine version of debug feature */
159 static unsigned int __used debug_feature_version = __DEBUG_FEATURE_VERSION;
160
161 /* static globals */
162
163 static debug_info_t *debug_area_first = NULL;
164 static debug_info_t *debug_area_last = NULL;
165 static DEFINE_MUTEX(debug_mutex);
166
167 static int initialized;
168
169 static const struct file_operations debug_file_ops = {
170 .owner = THIS_MODULE,
171 .read = debug_output,
172 .write = debug_input,
173 .open = debug_open,
174 .release = debug_close,
175 };
176
177 static struct dentry *debug_debugfs_root_entry;
178
179 /* functions */
180
181 /*
182 * debug_areas_alloc
183 * - Debug areas are implemented as a threedimensonal array:
184 * areas[areanumber][pagenumber][pageoffset]
185 */
186
187 static debug_entry_t***
188 debug_areas_alloc(int pages_per_area, int nr_areas)
189 {
190 debug_entry_t*** areas;
191 int i,j;
192
193 areas = kmalloc(nr_areas *
194 sizeof(debug_entry_t**),
195 GFP_KERNEL);
196 if (!areas)
197 goto fail_malloc_areas;
198 for (i = 0; i < nr_areas; i++) {
199 areas[i] = kmalloc(pages_per_area *
200 sizeof(debug_entry_t*),GFP_KERNEL);
201 if (!areas[i]) {
202 goto fail_malloc_areas2;
203 }
204 for(j = 0; j < pages_per_area; j++) {
205 areas[i][j] = kzalloc(PAGE_SIZE, GFP_KERNEL);
206 if(!areas[i][j]) {
207 for(j--; j >=0 ; j--) {
208 kfree(areas[i][j]);
209 }
210 kfree(areas[i]);
211 goto fail_malloc_areas2;
212 }
213 }
214 }
215 return areas;
216
217 fail_malloc_areas2:
218 for(i--; i >= 0; i--){
219 for(j=0; j < pages_per_area;j++){
220 kfree(areas[i][j]);
221 }
222 kfree(areas[i]);
223 }
224 kfree(areas);
225 fail_malloc_areas:
226 return NULL;
227
228 }
229
230
231 /*
232 * debug_info_alloc
233 * - alloc new debug-info
234 */
235
236 static debug_info_t*
237 debug_info_alloc(char *name, int pages_per_area, int nr_areas, int buf_size,
238 int level, int mode)
239 {
240 debug_info_t* rc;
241
242 /* alloc everything */
243
244 rc = kmalloc(sizeof(debug_info_t), GFP_KERNEL);
245 if(!rc)
246 goto fail_malloc_rc;
247 rc->active_entries = kcalloc(nr_areas, sizeof(int), GFP_KERNEL);
248 if(!rc->active_entries)
249 goto fail_malloc_active_entries;
250 rc->active_pages = kcalloc(nr_areas, sizeof(int), GFP_KERNEL);
251 if(!rc->active_pages)
252 goto fail_malloc_active_pages;
253 if((mode == ALL_AREAS) && (pages_per_area != 0)){
254 rc->areas = debug_areas_alloc(pages_per_area, nr_areas);
255 if(!rc->areas)
256 goto fail_malloc_areas;
257 } else {
258 rc->areas = NULL;
259 }
260
261 /* initialize members */
262
263 spin_lock_init(&rc->lock);
264 rc->pages_per_area = pages_per_area;
265 rc->nr_areas = nr_areas;
266 rc->active_area = 0;
267 rc->level = level;
268 rc->buf_size = buf_size;
269 rc->entry_size = sizeof(debug_entry_t) + buf_size;
270 strlcpy(rc->name, name, sizeof(rc->name));
271 memset(rc->views, 0, DEBUG_MAX_VIEWS * sizeof(struct debug_view *));
272 memset(rc->debugfs_entries, 0 ,DEBUG_MAX_VIEWS *
273 sizeof(struct dentry*));
274 atomic_set(&(rc->ref_count), 0);
275
276 return rc;
277
278 fail_malloc_areas:
279 kfree(rc->active_pages);
280 fail_malloc_active_pages:
281 kfree(rc->active_entries);
282 fail_malloc_active_entries:
283 kfree(rc);
284 fail_malloc_rc:
285 return NULL;
286 }
287
288 /*
289 * debug_areas_free
290 * - free all debug areas
291 */
292
293 static void
294 debug_areas_free(debug_info_t* db_info)
295 {
296 int i,j;
297
298 if(!db_info->areas)
299 return;
300 for (i = 0; i < db_info->nr_areas; i++) {
301 for(j = 0; j < db_info->pages_per_area; j++) {
302 kfree(db_info->areas[i][j]);
303 }
304 kfree(db_info->areas[i]);
305 }
306 kfree(db_info->areas);
307 db_info->areas = NULL;
308 }
309
310 /*
311 * debug_info_free
312 * - free memory debug-info
313 */
314
315 static void
316 debug_info_free(debug_info_t* db_info){
317 debug_areas_free(db_info);
318 kfree(db_info->active_entries);
319 kfree(db_info->active_pages);
320 kfree(db_info);
321 }
322
323 /*
324 * debug_info_create
325 * - create new debug-info
326 */
327
328 static debug_info_t*
329 debug_info_create(char *name, int pages_per_area, int nr_areas, int buf_size,
330 mode_t mode)
331 {
332 debug_info_t* rc;
333
334 rc = debug_info_alloc(name, pages_per_area, nr_areas, buf_size,
335 DEBUG_DEFAULT_LEVEL, ALL_AREAS);
336 if(!rc)
337 goto out;
338
339 rc->mode = mode & ~S_IFMT;
340
341 /* create root directory */
342 rc->debugfs_root_entry = debugfs_create_dir(rc->name,
343 debug_debugfs_root_entry);
344
345 /* append new element to linked list */
346 if (!debug_area_first) {
347 /* first element in list */
348 debug_area_first = rc;
349 rc->prev = NULL;
350 } else {
351 /* append element to end of list */
352 debug_area_last->next = rc;
353 rc->prev = debug_area_last;
354 }
355 debug_area_last = rc;
356 rc->next = NULL;
357
358 debug_info_get(rc);
359 out:
360 return rc;
361 }
362
363 /*
364 * debug_info_copy
365 * - copy debug-info
366 */
367
368 static debug_info_t*
369 debug_info_copy(debug_info_t* in, int mode)
370 {
371 int i,j;
372 debug_info_t* rc;
373 unsigned long flags;
374
375 /* get a consistent copy of the debug areas */
376 do {
377 rc = debug_info_alloc(in->name, in->pages_per_area,
378 in->nr_areas, in->buf_size, in->level, mode);
379 spin_lock_irqsave(&in->lock, flags);
380 if(!rc)
381 goto out;
382 /* has something changed in the meantime ? */
383 if((rc->pages_per_area == in->pages_per_area) &&
384 (rc->nr_areas == in->nr_areas)) {
385 break;
386 }
387 spin_unlock_irqrestore(&in->lock, flags);
388 debug_info_free(rc);
389 } while (1);
390
391 if(!rc || (mode == NO_AREAS))
392 goto out;
393
394 for(i = 0; i < in->nr_areas; i++){
395 for(j = 0; j < in->pages_per_area; j++) {
396 memcpy(rc->areas[i][j], in->areas[i][j],PAGE_SIZE);
397 }
398 }
399 out:
400 spin_unlock_irqrestore(&in->lock, flags);
401 return rc;
402 }
403
404 /*
405 * debug_info_get
406 * - increments reference count for debug-info
407 */
408
409 static void
410 debug_info_get(debug_info_t * db_info)
411 {
412 if (db_info)
413 atomic_inc(&db_info->ref_count);
414 }
415
416 /*
417 * debug_info_put:
418 * - decreases reference count for debug-info and frees it if necessary
419 */
420
421 static void
422 debug_info_put(debug_info_t *db_info)
423 {
424 int i;
425
426 if (!db_info)
427 return;
428 if (atomic_dec_and_test(&db_info->ref_count)) {
429 for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
430 if (!db_info->views[i])
431 continue;
432 debugfs_remove(db_info->debugfs_entries[i]);
433 }
434 debugfs_remove(db_info->debugfs_root_entry);
435 if(db_info == debug_area_first)
436 debug_area_first = db_info->next;
437 if(db_info == debug_area_last)
438 debug_area_last = db_info->prev;
439 if(db_info->prev) db_info->prev->next = db_info->next;
440 if(db_info->next) db_info->next->prev = db_info->prev;
441 debug_info_free(db_info);
442 }
443 }
444
445 /*
446 * debug_format_entry:
447 * - format one debug entry and return size of formated data
448 */
449
450 static int
451 debug_format_entry(file_private_info_t *p_info)
452 {
453 debug_info_t *id_snap = p_info->debug_info_snap;
454 struct debug_view *view = p_info->view;
455 debug_entry_t *act_entry;
456 size_t len = 0;
457 if(p_info->act_entry == DEBUG_PROLOG_ENTRY){
458 /* print prolog */
459 if (view->prolog_proc)
460 len += view->prolog_proc(id_snap,view,p_info->temp_buf);
461 goto out;
462 }
463 if (!id_snap->areas) /* this is true, if we have a prolog only view */
464 goto out; /* or if 'pages_per_area' is 0 */
465 act_entry = (debug_entry_t *) ((char*)id_snap->areas[p_info->act_area]
466 [p_info->act_page] + p_info->act_entry);
467
468 if (act_entry->id.stck == 0LL)
469 goto out; /* empty entry */
470 if (view->header_proc)
471 len += view->header_proc(id_snap, view, p_info->act_area,
472 act_entry, p_info->temp_buf + len);
473 if (view->format_proc)
474 len += view->format_proc(id_snap, view, p_info->temp_buf + len,
475 DEBUG_DATA(act_entry));
476 out:
477 return len;
478 }
479
480 /*
481 * debug_next_entry:
482 * - goto next entry in p_info
483 */
484
485 static inline int
486 debug_next_entry(file_private_info_t *p_info)
487 {
488 debug_info_t *id;
489
490 id = p_info->debug_info_snap;
491 if(p_info->act_entry == DEBUG_PROLOG_ENTRY){
492 p_info->act_entry = 0;
493 p_info->act_page = 0;
494 goto out;
495 }
496 if(!id->areas)
497 return 1;
498 p_info->act_entry += id->entry_size;
499 /* switch to next page, if we reached the end of the page */
500 if (p_info->act_entry > (PAGE_SIZE - id->entry_size)){
501 /* next page */
502 p_info->act_entry = 0;
503 p_info->act_page += 1;
504 if((p_info->act_page % id->pages_per_area) == 0) {
505 /* next area */
506 p_info->act_area++;
507 p_info->act_page=0;
508 }
509 if(p_info->act_area >= id->nr_areas)
510 return 1;
511 }
512 out:
513 return 0;
514 }
515
516 /*
517 * debug_output:
518 * - called for user read()
519 * - copies formated debug entries to the user buffer
520 */
521
522 static ssize_t
523 debug_output(struct file *file, /* file descriptor */
524 char __user *user_buf, /* user buffer */
525 size_t len, /* length of buffer */
526 loff_t *offset) /* offset in the file */
527 {
528 size_t count = 0;
529 size_t entry_offset;
530 file_private_info_t *p_info;
531
532 p_info = ((file_private_info_t *) file->private_data);
533 if (*offset != p_info->offset)
534 return -EPIPE;
535 if(p_info->act_area >= p_info->debug_info_snap->nr_areas)
536 return 0;
537 entry_offset = p_info->act_entry_offset;
538 while(count < len){
539 int formatted_line_size;
540 int formatted_line_residue;
541 int user_buf_residue;
542 size_t copy_size;
543
544 formatted_line_size = debug_format_entry(p_info);
545 formatted_line_residue = formatted_line_size - entry_offset;
546 user_buf_residue = len-count;
547 copy_size = min(user_buf_residue, formatted_line_residue);
548 if(copy_size){
549 if (copy_to_user(user_buf + count, p_info->temp_buf
550 + entry_offset, copy_size))
551 return -EFAULT;
552 count += copy_size;
553 entry_offset += copy_size;
554 }
555 if(copy_size == formatted_line_residue){
556 entry_offset = 0;
557 if(debug_next_entry(p_info))
558 goto out;
559 }
560 }
561 out:
562 p_info->offset = *offset + count;
563 p_info->act_entry_offset = entry_offset;
564 *offset = p_info->offset;
565 return count;
566 }
567
568 /*
569 * debug_input:
570 * - called for user write()
571 * - calls input function of view
572 */
573
574 static ssize_t
575 debug_input(struct file *file, const char __user *user_buf, size_t length,
576 loff_t *offset)
577 {
578 int rc = 0;
579 file_private_info_t *p_info;
580
581 mutex_lock(&debug_mutex);
582 p_info = ((file_private_info_t *) file->private_data);
583 if (p_info->view->input_proc)
584 rc = p_info->view->input_proc(p_info->debug_info_org,
585 p_info->view, file, user_buf,
586 length, offset);
587 else
588 rc = -EPERM;
589 mutex_unlock(&debug_mutex);
590 return rc; /* number of input characters */
591 }
592
593 /*
594 * debug_open:
595 * - called for user open()
596 * - copies formated output to private_data area of the file
597 * handle
598 */
599
600 static int
601 debug_open(struct inode *inode, struct file *file)
602 {
603 int i = 0, rc = 0;
604 file_private_info_t *p_info;
605 debug_info_t *debug_info, *debug_info_snapshot;
606
607 mutex_lock(&debug_mutex);
608 debug_info = file->f_path.dentry->d_inode->i_private;
609 /* find debug view */
610 for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
611 if (!debug_info->views[i])
612 continue;
613 else if (debug_info->debugfs_entries[i] ==
614 file->f_path.dentry) {
615 goto found; /* found view ! */
616 }
617 }
618 /* no entry found */
619 rc = -EINVAL;
620 goto out;
621
622 found:
623
624 /* Make snapshot of current debug areas to get it consistent. */
625 /* To copy all the areas is only needed, if we have a view which */
626 /* formats the debug areas. */
627
628 if(!debug_info->views[i]->format_proc &&
629 !debug_info->views[i]->header_proc){
630 debug_info_snapshot = debug_info_copy(debug_info, NO_AREAS);
631 } else {
632 debug_info_snapshot = debug_info_copy(debug_info, ALL_AREAS);
633 }
634
635 if(!debug_info_snapshot){
636 rc = -ENOMEM;
637 goto out;
638 }
639 p_info = kmalloc(sizeof(file_private_info_t),
640 GFP_KERNEL);
641 if(!p_info){
642 if(debug_info_snapshot)
643 debug_info_free(debug_info_snapshot);
644 rc = -ENOMEM;
645 goto out;
646 }
647 p_info->offset = 0;
648 p_info->debug_info_snap = debug_info_snapshot;
649 p_info->debug_info_org = debug_info;
650 p_info->view = debug_info->views[i];
651 p_info->act_area = 0;
652 p_info->act_page = 0;
653 p_info->act_entry = DEBUG_PROLOG_ENTRY;
654 p_info->act_entry_offset = 0;
655 file->private_data = p_info;
656 debug_info_get(debug_info);
657 out:
658 mutex_unlock(&debug_mutex);
659 return rc;
660 }
661
662 /*
663 * debug_close:
664 * - called for user close()
665 * - deletes private_data area of the file handle
666 */
667
668 static int
669 debug_close(struct inode *inode, struct file *file)
670 {
671 file_private_info_t *p_info;
672 p_info = (file_private_info_t *) file->private_data;
673 if(p_info->debug_info_snap)
674 debug_info_free(p_info->debug_info_snap);
675 debug_info_put(p_info->debug_info_org);
676 kfree(file->private_data);
677 return 0; /* success */
678 }
679
680 /*
681 * debug_register_mode:
682 * - Creates and initializes debug area for the caller
683 * The mode parameter allows to specify access rights for the s390dbf files
684 * - Returns handle for debug area
685 */
686
687 debug_info_t *debug_register_mode(char *name, int pages_per_area, int nr_areas,
688 int buf_size, mode_t mode, uid_t uid,
689 gid_t gid)
690 {
691 debug_info_t *rc = NULL;
692
693 /* Since debugfs currently does not support uid/gid other than root, */
694 /* we do not allow gid/uid != 0 until we get support for that. */
695 if ((uid != 0) || (gid != 0))
696 printk(KERN_WARNING "debug: Warning - Currently only uid/gid "
697 "= 0 are supported. Using root as owner now!");
698 if (!initialized)
699 BUG();
700 mutex_lock(&debug_mutex);
701
702 /* create new debug_info */
703
704 rc = debug_info_create(name, pages_per_area, nr_areas, buf_size, mode);
705 if(!rc)
706 goto out;
707 debug_register_view(rc, &debug_level_view);
708 debug_register_view(rc, &debug_flush_view);
709 debug_register_view(rc, &debug_pages_view);
710 out:
711 if (!rc){
712 printk(KERN_ERR "debug: debug_register failed for %s\n",name);
713 }
714 mutex_unlock(&debug_mutex);
715 return rc;
716 }
717 EXPORT_SYMBOL(debug_register_mode);
718
719 /*
720 * debug_register:
721 * - creates and initializes debug area for the caller
722 * - returns handle for debug area
723 */
724
725 debug_info_t *debug_register(char *name, int pages_per_area, int nr_areas,
726 int buf_size)
727 {
728 return debug_register_mode(name, pages_per_area, nr_areas, buf_size,
729 S_IRUSR | S_IWUSR, 0, 0);
730 }
731
732 /*
733 * debug_unregister:
734 * - give back debug area
735 */
736
737 void
738 debug_unregister(debug_info_t * id)
739 {
740 if (!id)
741 goto out;
742 mutex_lock(&debug_mutex);
743 debug_info_put(id);
744 mutex_unlock(&debug_mutex);
745
746 out:
747 return;
748 }
749
750 /*
751 * debug_set_size:
752 * - set area size (number of pages) and number of areas
753 */
754 static int
755 debug_set_size(debug_info_t* id, int nr_areas, int pages_per_area)
756 {
757 unsigned long flags;
758 debug_entry_t *** new_areas;
759 int rc=0;
760
761 if(!id || (nr_areas <= 0) || (pages_per_area < 0))
762 return -EINVAL;
763 if(pages_per_area > 0){
764 new_areas = debug_areas_alloc(pages_per_area, nr_areas);
765 if(!new_areas) {
766 printk(KERN_WARNING "debug: could not allocate memory "\
767 "for pagenumber: %i\n",pages_per_area);
768 rc = -ENOMEM;
769 goto out;
770 }
771 } else {
772 new_areas = NULL;
773 }
774 spin_lock_irqsave(&id->lock,flags);
775 debug_areas_free(id);
776 id->areas = new_areas;
777 id->nr_areas = nr_areas;
778 id->pages_per_area = pages_per_area;
779 id->active_area = 0;
780 memset(id->active_entries,0,sizeof(int)*id->nr_areas);
781 memset(id->active_pages, 0, sizeof(int)*id->nr_areas);
782 spin_unlock_irqrestore(&id->lock,flags);
783 printk(KERN_INFO "debug: %s: set new size (%i pages)\n"\
784 ,id->name, pages_per_area);
785 out:
786 return rc;
787 }
788
789 /*
790 * debug_set_level:
791 * - set actual debug level
792 */
793
794 void
795 debug_set_level(debug_info_t* id, int new_level)
796 {
797 unsigned long flags;
798 if(!id)
799 return;
800 spin_lock_irqsave(&id->lock,flags);
801 if(new_level == DEBUG_OFF_LEVEL){
802 id->level = DEBUG_OFF_LEVEL;
803 printk(KERN_INFO "debug: %s: switched off\n",id->name);
804 } else if ((new_level > DEBUG_MAX_LEVEL) || (new_level < 0)) {
805 printk(KERN_INFO
806 "debug: %s: level %i is out of range (%i - %i)\n",
807 id->name, new_level, 0, DEBUG_MAX_LEVEL);
808 } else {
809 id->level = new_level;
810 }
811 spin_unlock_irqrestore(&id->lock,flags);
812 }
813
814
815 /*
816 * proceed_active_entry:
817 * - set active entry to next in the ring buffer
818 */
819
820 static inline void
821 proceed_active_entry(debug_info_t * id)
822 {
823 if ((id->active_entries[id->active_area] += id->entry_size)
824 > (PAGE_SIZE - id->entry_size)){
825 id->active_entries[id->active_area] = 0;
826 id->active_pages[id->active_area] =
827 (id->active_pages[id->active_area] + 1) %
828 id->pages_per_area;
829 }
830 }
831
832 /*
833 * proceed_active_area:
834 * - set active area to next in the ring buffer
835 */
836
837 static inline void
838 proceed_active_area(debug_info_t * id)
839 {
840 id->active_area++;
841 id->active_area = id->active_area % id->nr_areas;
842 }
843
844 /*
845 * get_active_entry:
846 */
847
848 static inline debug_entry_t*
849 get_active_entry(debug_info_t * id)
850 {
851 return (debug_entry_t *) (((char *) id->areas[id->active_area]
852 [id->active_pages[id->active_area]]) +
853 id->active_entries[id->active_area]);
854 }
855
856 /*
857 * debug_finish_entry:
858 * - set timestamp, caller address, cpu number etc.
859 */
860
861 static inline void
862 debug_finish_entry(debug_info_t * id, debug_entry_t* active, int level,
863 int exception)
864 {
865 active->id.stck = get_clock();
866 active->id.fields.cpuid = smp_processor_id();
867 active->caller = __builtin_return_address(0);
868 active->id.fields.exception = exception;
869 active->id.fields.level = level;
870 proceed_active_entry(id);
871 if(exception)
872 proceed_active_area(id);
873 }
874
875 static int debug_stoppable=1;
876 static int debug_active=1;
877
878 #define CTL_S390DBF_STOPPABLE 5678
879 #define CTL_S390DBF_ACTIVE 5679
880
881 /*
882 * proc handler for the running debug_active sysctl
883 * always allow read, allow write only if debug_stoppable is set or
884 * if debug_active is already off
885 */
886 static int
887 s390dbf_procactive(ctl_table *table, int write, struct file *filp,
888 void __user *buffer, size_t *lenp, loff_t *ppos)
889 {
890 if (!write || debug_stoppable || !debug_active)
891 return proc_dointvec(table, write, filp, buffer, lenp, ppos);
892 else
893 return 0;
894 }
895
896
897 static struct ctl_table s390dbf_table[] = {
898 {
899 .ctl_name = CTL_S390DBF_STOPPABLE,
900 .procname = "debug_stoppable",
901 .data = &debug_stoppable,
902 .maxlen = sizeof(int),
903 .mode = S_IRUGO | S_IWUSR,
904 .proc_handler = &proc_dointvec,
905 .strategy = &sysctl_intvec,
906 },
907 {
908 .ctl_name = CTL_S390DBF_ACTIVE,
909 .procname = "debug_active",
910 .data = &debug_active,
911 .maxlen = sizeof(int),
912 .mode = S_IRUGO | S_IWUSR,
913 .proc_handler = &s390dbf_procactive,
914 .strategy = &sysctl_intvec,
915 },
916 { .ctl_name = 0 }
917 };
918
919 static struct ctl_table s390dbf_dir_table[] = {
920 {
921 .ctl_name = CTL_S390DBF,
922 .procname = "s390dbf",
923 .maxlen = 0,
924 .mode = S_IRUGO | S_IXUGO,
925 .child = s390dbf_table,
926 },
927 { .ctl_name = 0 }
928 };
929
930 static struct ctl_table_header *s390dbf_sysctl_header;
931
932 void
933 debug_stop_all(void)
934 {
935 if (debug_stoppable)
936 debug_active = 0;
937 }
938
939
940 /*
941 * debug_event_common:
942 * - write debug entry with given size
943 */
944
945 debug_entry_t*
946 debug_event_common(debug_info_t * id, int level, const void *buf, int len)
947 {
948 unsigned long flags;
949 debug_entry_t *active;
950
951 if (!debug_active || !id->areas)
952 return NULL;
953 spin_lock_irqsave(&id->lock, flags);
954 active = get_active_entry(id);
955 memset(DEBUG_DATA(active), 0, id->buf_size);
956 memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size));
957 debug_finish_entry(id, active, level, 0);
958 spin_unlock_irqrestore(&id->lock, flags);
959
960 return active;
961 }
962
963 /*
964 * debug_exception_common:
965 * - write debug entry with given size and switch to next debug area
966 */
967
968 debug_entry_t
969 *debug_exception_common(debug_info_t * id, int level, const void *buf, int len)
970 {
971 unsigned long flags;
972 debug_entry_t *active;
973
974 if (!debug_active || !id->areas)
975 return NULL;
976 spin_lock_irqsave(&id->lock, flags);
977 active = get_active_entry(id);
978 memset(DEBUG_DATA(active), 0, id->buf_size);
979 memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size));
980 debug_finish_entry(id, active, level, 1);
981 spin_unlock_irqrestore(&id->lock, flags);
982
983 return active;
984 }
985
986 /*
987 * counts arguments in format string for sprintf view
988 */
989
990 static inline int
991 debug_count_numargs(char *string)
992 {
993 int numargs=0;
994
995 while(*string) {
996 if(*string++=='%')
997 numargs++;
998 }
999 return(numargs);
1000 }
1001
1002 /*
1003 * debug_sprintf_event:
1004 */
1005
1006 debug_entry_t*
1007 debug_sprintf_event(debug_info_t* id, int level,char *string,...)
1008 {
1009 va_list ap;
1010 int numargs,idx;
1011 unsigned long flags;
1012 debug_sprintf_entry_t *curr_event;
1013 debug_entry_t *active;
1014
1015 if((!id) || (level > id->level))
1016 return NULL;
1017 if (!debug_active || !id->areas)
1018 return NULL;
1019 numargs=debug_count_numargs(string);
1020
1021 spin_lock_irqsave(&id->lock, flags);
1022 active = get_active_entry(id);
1023 curr_event=(debug_sprintf_entry_t *) DEBUG_DATA(active);
1024 va_start(ap,string);
1025 curr_event->string=string;
1026 for(idx=0;idx<min(numargs,(int)(id->buf_size / sizeof(long))-1);idx++)
1027 curr_event->args[idx]=va_arg(ap,long);
1028 va_end(ap);
1029 debug_finish_entry(id, active, level, 0);
1030 spin_unlock_irqrestore(&id->lock, flags);
1031
1032 return active;
1033 }
1034
1035 /*
1036 * debug_sprintf_exception:
1037 */
1038
1039 debug_entry_t*
1040 debug_sprintf_exception(debug_info_t* id, int level,char *string,...)
1041 {
1042 va_list ap;
1043 int numargs,idx;
1044 unsigned long flags;
1045 debug_sprintf_entry_t *curr_event;
1046 debug_entry_t *active;
1047
1048 if((!id) || (level > id->level))
1049 return NULL;
1050 if (!debug_active || !id->areas)
1051 return NULL;
1052
1053 numargs=debug_count_numargs(string);
1054
1055 spin_lock_irqsave(&id->lock, flags);
1056 active = get_active_entry(id);
1057 curr_event=(debug_sprintf_entry_t *)DEBUG_DATA(active);
1058 va_start(ap,string);
1059 curr_event->string=string;
1060 for(idx=0;idx<min(numargs,(int)(id->buf_size / sizeof(long))-1);idx++)
1061 curr_event->args[idx]=va_arg(ap,long);
1062 va_end(ap);
1063 debug_finish_entry(id, active, level, 1);
1064 spin_unlock_irqrestore(&id->lock, flags);
1065
1066 return active;
1067 }
1068
1069 /*
1070 * debug_init:
1071 * - is called exactly once to initialize the debug feature
1072 */
1073
1074 static int
1075 __init debug_init(void)
1076 {
1077 int rc = 0;
1078
1079 s390dbf_sysctl_header = register_sysctl_table(s390dbf_dir_table);
1080 mutex_lock(&debug_mutex);
1081 debug_debugfs_root_entry = debugfs_create_dir(DEBUG_DIR_ROOT,NULL);
1082 printk(KERN_INFO "debug: Initialization complete\n");
1083 initialized = 1;
1084 mutex_unlock(&debug_mutex);
1085
1086 return rc;
1087 }
1088
1089 /*
1090 * debug_register_view:
1091 */
1092
1093 int
1094 debug_register_view(debug_info_t * id, struct debug_view *view)
1095 {
1096 int rc = 0;
1097 int i;
1098 unsigned long flags;
1099 mode_t mode;
1100 struct dentry *pde;
1101
1102 if (!id)
1103 goto out;
1104 mode = (id->mode | S_IFREG) & ~S_IXUGO;
1105 if (!(view->prolog_proc || view->format_proc || view->header_proc))
1106 mode &= ~(S_IRUSR | S_IRGRP | S_IROTH);
1107 if (!view->input_proc)
1108 mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
1109 pde = debugfs_create_file(view->name, mode, id->debugfs_root_entry,
1110 id , &debug_file_ops);
1111 if (!pde){
1112 printk(KERN_WARNING "debug: debugfs_create_file() failed!"\
1113 " Cannot register view %s/%s\n", id->name,view->name);
1114 rc = -1;
1115 goto out;
1116 }
1117 spin_lock_irqsave(&id->lock, flags);
1118 for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
1119 if (!id->views[i])
1120 break;
1121 }
1122 if (i == DEBUG_MAX_VIEWS) {
1123 printk(KERN_WARNING "debug: cannot register view %s/%s\n",
1124 id->name,view->name);
1125 printk(KERN_WARNING
1126 "debug: maximum number of views reached (%i)!\n", i);
1127 debugfs_remove(pde);
1128 rc = -1;
1129 } else {
1130 id->views[i] = view;
1131 id->debugfs_entries[i] = pde;
1132 }
1133 spin_unlock_irqrestore(&id->lock, flags);
1134 out:
1135 return rc;
1136 }
1137
1138 /*
1139 * debug_unregister_view:
1140 */
1141
1142 int
1143 debug_unregister_view(debug_info_t * id, struct debug_view *view)
1144 {
1145 int rc = 0;
1146 int i;
1147 unsigned long flags;
1148
1149 if (!id)
1150 goto out;
1151 spin_lock_irqsave(&id->lock, flags);
1152 for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
1153 if (id->views[i] == view)
1154 break;
1155 }
1156 if (i == DEBUG_MAX_VIEWS)
1157 rc = -1;
1158 else {
1159 debugfs_remove(id->debugfs_entries[i]);
1160 id->views[i] = NULL;
1161 rc = 0;
1162 }
1163 spin_unlock_irqrestore(&id->lock, flags);
1164 out:
1165 return rc;
1166 }
1167
1168 static inline char *
1169 debug_get_user_string(const char __user *user_buf, size_t user_len)
1170 {
1171 char* buffer;
1172
1173 buffer = kmalloc(user_len + 1, GFP_KERNEL);
1174 if (!buffer)
1175 return ERR_PTR(-ENOMEM);
1176 if (copy_from_user(buffer, user_buf, user_len) != 0) {
1177 kfree(buffer);
1178 return ERR_PTR(-EFAULT);
1179 }
1180 /* got the string, now strip linefeed. */
1181 if (buffer[user_len - 1] == '\n')
1182 buffer[user_len - 1] = 0;
1183 else
1184 buffer[user_len] = 0;
1185 return buffer;
1186 }
1187
1188 static inline int
1189 debug_get_uint(char *buf)
1190 {
1191 int rc;
1192
1193 for(; isspace(*buf); buf++);
1194 rc = simple_strtoul(buf, &buf, 10);
1195 if(*buf){
1196 printk("debug: no integer specified!\n");
1197 rc = -EINVAL;
1198 }
1199 return rc;
1200 }
1201
1202 /*
1203 * functions for debug-views
1204 ***********************************
1205 */
1206
1207 /*
1208 * prints out actual debug level
1209 */
1210
1211 static int
1212 debug_prolog_pages_fn(debug_info_t * id,
1213 struct debug_view *view, char *out_buf)
1214 {
1215 return sprintf(out_buf, "%i\n", id->pages_per_area);
1216 }
1217
1218 /*
1219 * reads new size (number of pages per debug area)
1220 */
1221
1222 static int
1223 debug_input_pages_fn(debug_info_t * id, struct debug_view *view,
1224 struct file *file, const char __user *user_buf,
1225 size_t user_len, loff_t * offset)
1226 {
1227 char *str;
1228 int rc,new_pages;
1229
1230 if (user_len > 0x10000)
1231 user_len = 0x10000;
1232 if (*offset != 0){
1233 rc = -EPIPE;
1234 goto out;
1235 }
1236 str = debug_get_user_string(user_buf,user_len);
1237 if(IS_ERR(str)){
1238 rc = PTR_ERR(str);
1239 goto out;
1240 }
1241 new_pages = debug_get_uint(str);
1242 if(new_pages < 0){
1243 rc = -EINVAL;
1244 goto free_str;
1245 }
1246 rc = debug_set_size(id,id->nr_areas, new_pages);
1247 if(rc != 0){
1248 rc = -EINVAL;
1249 goto free_str;
1250 }
1251 rc = user_len;
1252 free_str:
1253 kfree(str);
1254 out:
1255 *offset += user_len;
1256 return rc; /* number of input characters */
1257 }
1258
1259 /*
1260 * prints out actual debug level
1261 */
1262
1263 static int
1264 debug_prolog_level_fn(debug_info_t * id, struct debug_view *view, char *out_buf)
1265 {
1266 int rc = 0;
1267
1268 if(id->level == DEBUG_OFF_LEVEL) {
1269 rc = sprintf(out_buf,"-\n");
1270 }
1271 else {
1272 rc = sprintf(out_buf, "%i\n", id->level);
1273 }
1274 return rc;
1275 }
1276
1277 /*
1278 * reads new debug level
1279 */
1280
1281 static int
1282 debug_input_level_fn(debug_info_t * id, struct debug_view *view,
1283 struct file *file, const char __user *user_buf,
1284 size_t user_len, loff_t * offset)
1285 {
1286 char *str;
1287 int rc,new_level;
1288
1289 if (user_len > 0x10000)
1290 user_len = 0x10000;
1291 if (*offset != 0){
1292 rc = -EPIPE;
1293 goto out;
1294 }
1295 str = debug_get_user_string(user_buf,user_len);
1296 if(IS_ERR(str)){
1297 rc = PTR_ERR(str);
1298 goto out;
1299 }
1300 if(str[0] == '-'){
1301 debug_set_level(id, DEBUG_OFF_LEVEL);
1302 rc = user_len;
1303 goto free_str;
1304 } else {
1305 new_level = debug_get_uint(str);
1306 }
1307 if(new_level < 0) {
1308 printk(KERN_INFO "debug: level `%s` is not valid\n", str);
1309 rc = -EINVAL;
1310 } else {
1311 debug_set_level(id, new_level);
1312 rc = user_len;
1313 }
1314 free_str:
1315 kfree(str);
1316 out:
1317 *offset += user_len;
1318 return rc; /* number of input characters */
1319 }
1320
1321
1322 /*
1323 * flushes debug areas
1324 */
1325
1326 static void debug_flush(debug_info_t* id, int area)
1327 {
1328 unsigned long flags;
1329 int i,j;
1330
1331 if(!id || !id->areas)
1332 return;
1333 spin_lock_irqsave(&id->lock,flags);
1334 if(area == DEBUG_FLUSH_ALL){
1335 id->active_area = 0;
1336 memset(id->active_entries, 0, id->nr_areas * sizeof(int));
1337 for (i = 0; i < id->nr_areas; i++) {
1338 id->active_pages[i] = 0;
1339 for(j = 0; j < id->pages_per_area; j++) {
1340 memset(id->areas[i][j], 0, PAGE_SIZE);
1341 }
1342 }
1343 printk(KERN_INFO "debug: %s: all areas flushed\n",id->name);
1344 } else if(area >= 0 && area < id->nr_areas) {
1345 id->active_entries[area] = 0;
1346 id->active_pages[area] = 0;
1347 for(i = 0; i < id->pages_per_area; i++) {
1348 memset(id->areas[area][i],0,PAGE_SIZE);
1349 }
1350 printk(KERN_INFO "debug: %s: area %i has been flushed\n",
1351 id->name, area);
1352 } else {
1353 printk(KERN_INFO
1354 "debug: %s: area %i cannot be flushed (range: %i - %i)\n",
1355 id->name, area, 0, id->nr_areas-1);
1356 }
1357 spin_unlock_irqrestore(&id->lock,flags);
1358 }
1359
1360 /*
1361 * view function: flushes debug areas
1362 */
1363
1364 static int
1365 debug_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 printk(KERN_INFO "debug: area `%c` is not valid\n", input_buf[0]);
1393
1394 out:
1395 *offset += user_len;
1396 return rc; /* number of input characters */
1397 }
1398
1399 /*
1400 * prints debug header in raw format
1401 */
1402
1403 static int
1404 debug_raw_header_fn(debug_info_t * id, struct debug_view *view,
1405 int area, debug_entry_t * entry, char *out_buf)
1406 {
1407 int rc;
1408
1409 rc = sizeof(debug_entry_t);
1410 memcpy(out_buf,entry,sizeof(debug_entry_t));
1411 return rc;
1412 }
1413
1414 /*
1415 * prints debug data in raw format
1416 */
1417
1418 static int
1419 debug_raw_format_fn(debug_info_t * id, struct debug_view *view,
1420 char *out_buf, const char *in_buf)
1421 {
1422 int rc;
1423
1424 rc = id->buf_size;
1425 memcpy(out_buf, in_buf, id->buf_size);
1426 return rc;
1427 }
1428
1429 /*
1430 * prints debug data in hex/ascii format
1431 */
1432
1433 static int
1434 debug_hex_ascii_format_fn(debug_info_t * id, struct debug_view *view,
1435 char *out_buf, const char *in_buf)
1436 {
1437 int i, rc = 0;
1438
1439 for (i = 0; i < id->buf_size; i++) {
1440 rc += sprintf(out_buf + rc, "%02x ",
1441 ((unsigned char *) in_buf)[i]);
1442 }
1443 rc += sprintf(out_buf + rc, "| ");
1444 for (i = 0; i < id->buf_size; i++) {
1445 unsigned char c = in_buf[i];
1446 if (!isprint(c))
1447 rc += sprintf(out_buf + rc, ".");
1448 else
1449 rc += sprintf(out_buf + rc, "%c", c);
1450 }
1451 rc += sprintf(out_buf + rc, "\n");
1452 return rc;
1453 }
1454
1455 /*
1456 * prints header for debug entry
1457 */
1458
1459 int
1460 debug_dflt_header_fn(debug_info_t * id, struct debug_view *view,
1461 int area, debug_entry_t * entry, char *out_buf)
1462 {
1463 struct timespec time_spec;
1464 unsigned long long time;
1465 char *except_str;
1466 unsigned long caller;
1467 int rc = 0;
1468 unsigned int level;
1469
1470 level = entry->id.fields.level;
1471 time = entry->id.stck;
1472 /* adjust todclock to 1970 */
1473 time -= 0x8126d60e46000000LL - (0x3c26700LL * 1000000 * 4096);
1474 tod_to_timeval(time, &time_spec);
1475
1476 if (entry->id.fields.exception)
1477 except_str = "*";
1478 else
1479 except_str = "-";
1480 caller = ((unsigned long) entry->caller) & PSW_ADDR_INSN;
1481 rc += sprintf(out_buf, "%02i %011lu:%06lu %1u %1s %02i %p ",
1482 area, time_spec.tv_sec, time_spec.tv_nsec / 1000, level,
1483 except_str, entry->id.fields.cpuid, (void *) caller);
1484 return rc;
1485 }
1486
1487 /*
1488 * prints debug data sprintf-formated:
1489 * debug_sprinf_event/exception calls must be used together with this view
1490 */
1491
1492 #define DEBUG_SPRINTF_MAX_ARGS 10
1493
1494 static int
1495 debug_sprintf_format_fn(debug_info_t * id, struct debug_view *view,
1496 char *out_buf, debug_sprintf_entry_t *curr_event)
1497 {
1498 int num_longs, num_used_args = 0,i, rc = 0;
1499 int index[DEBUG_SPRINTF_MAX_ARGS];
1500
1501 /* count of longs fit into one entry */
1502 num_longs = id->buf_size / sizeof(long);
1503
1504 if(num_longs < 1)
1505 goto out; /* bufsize of entry too small */
1506 if(num_longs == 1) {
1507 /* no args, we use only the string */
1508 strcpy(out_buf, curr_event->string);
1509 rc = strlen(curr_event->string);
1510 goto out;
1511 }
1512
1513 /* number of arguments used for sprintf (without the format string) */
1514 num_used_args = min(DEBUG_SPRINTF_MAX_ARGS, (num_longs - 1));
1515
1516 memset(index,0, DEBUG_SPRINTF_MAX_ARGS * sizeof(int));
1517
1518 for(i = 0; i < num_used_args; i++)
1519 index[i] = i;
1520
1521 rc = sprintf(out_buf, curr_event->string, curr_event->args[index[0]],
1522 curr_event->args[index[1]], curr_event->args[index[2]],
1523 curr_event->args[index[3]], curr_event->args[index[4]],
1524 curr_event->args[index[5]], curr_event->args[index[6]],
1525 curr_event->args[index[7]], curr_event->args[index[8]],
1526 curr_event->args[index[9]]);
1527
1528 out:
1529
1530 return rc;
1531 }
1532
1533 /*
1534 * clean up module
1535 */
1536 static void __exit debug_exit(void)
1537 {
1538 debugfs_remove(debug_debugfs_root_entry);
1539 unregister_sysctl_table(s390dbf_sysctl_header);
1540 return;
1541 }
1542
1543 /*
1544 * module definitions
1545 */
1546 postcore_initcall(debug_init);
1547 module_exit(debug_exit);
1548 MODULE_LICENSE("GPL");
1549
1550 EXPORT_SYMBOL(debug_register);
1551 EXPORT_SYMBOL(debug_unregister);
1552 EXPORT_SYMBOL(debug_set_level);
1553 EXPORT_SYMBOL(debug_stop_all);
1554 EXPORT_SYMBOL(debug_register_view);
1555 EXPORT_SYMBOL(debug_unregister_view);
1556 EXPORT_SYMBOL(debug_event_common);
1557 EXPORT_SYMBOL(debug_exception_common);
1558 EXPORT_SYMBOL(debug_hex_ascii_view);
1559 EXPORT_SYMBOL(debug_raw_view);
1560 EXPORT_SYMBOL(debug_dflt_header_fn);
1561 EXPORT_SYMBOL(debug_sprintf_view);
1562 EXPORT_SYMBOL(debug_sprintf_exception);
1563 EXPORT_SYMBOL(debug_sprintf_event);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree