Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * arch/s390/kernel/debug.c | |
3 | * S/390 debug facility | |
4 | * | |
5 | * Copyright (C) 1999, 2000 IBM Deutschland Entwicklung GmbH, | |
6 | * IBM Corporation | |
7 | * Author(s): Michael Holzheu (holzheu@de.ibm.com), | |
8 | * Holger Smolinski (Holger.Smolinski@de.ibm.com) | |
9 | * | |
10 | * Bugreports to: <Linux390@de.ibm.com> | |
11 | */ | |
12 | ||
13 | #include <linux/config.h> | |
14 | #include <linux/stddef.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/errno.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/ctype.h> | |
19 | #include <linux/sysctl.h> | |
20 | #include <asm/uaccess.h> | |
21 | #include <asm/semaphore.h> | |
1da177e4 LT |
22 | #include <linux/module.h> |
23 | #include <linux/init.h> | |
66a464db MH |
24 | #include <linux/fs.h> |
25 | #include <linux/debugfs.h> | |
1da177e4 LT |
26 | |
27 | #include <asm/debug.h> | |
28 | ||
29 | #define DEBUG_PROLOG_ENTRY -1 | |
30 | ||
66a464db MH |
31 | #define ALL_AREAS 0 /* copy all debug areas */ |
32 | #define NO_AREAS 1 /* copy no debug areas */ | |
33 | ||
1da177e4 LT |
34 | /* typedefs */ |
35 | ||
36 | typedef struct file_private_info { | |
37 | loff_t offset; /* offset of last read in file */ | |
38 | int act_area; /* number of last formated area */ | |
66a464db | 39 | int act_page; /* act page in given area */ |
1da177e4 LT |
40 | int act_entry; /* last formated entry (offset */ |
41 | /* relative to beginning of last */ | |
66a464db | 42 | /* formated page) */ |
1da177e4 LT |
43 | size_t act_entry_offset; /* up to this offset we copied */ |
44 | /* in last read the last formated */ | |
45 | /* entry to userland */ | |
46 | char temp_buf[2048]; /* buffer for output */ | |
47 | debug_info_t *debug_info_org; /* original debug information */ | |
48 | debug_info_t *debug_info_snap; /* snapshot of debug information */ | |
49 | struct debug_view *view; /* used view of debug info */ | |
50 | } file_private_info_t; | |
51 | ||
52 | typedef struct | |
53 | { | |
54 | char *string; | |
55 | /* | |
56 | * This assumes that all args are converted into longs | |
57 | * on L/390 this is the case for all types of parameter | |
58 | * except of floats, and long long (32 bit) | |
66a464db MH |
59 | * |
60 | */ | |
1da177e4 LT |
61 | long args[0]; |
62 | } debug_sprintf_entry_t; | |
63 | ||
64 | ||
942eaabd | 65 | extern void tod_to_timeval(uint64_t todval, struct timespec *xtime); |
1da177e4 LT |
66 | |
67 | /* internal function prototyes */ | |
68 | ||
69 | static int debug_init(void); | |
70 | static ssize_t debug_output(struct file *file, char __user *user_buf, | |
66a464db | 71 | size_t user_len, loff_t * offset); |
1da177e4 | 72 | static ssize_t debug_input(struct file *file, const char __user *user_buf, |
66a464db | 73 | size_t user_len, loff_t * offset); |
1da177e4 LT |
74 | static int debug_open(struct inode *inode, struct file *file); |
75 | static int debug_close(struct inode *inode, struct file *file); | |
66a464db MH |
76 | static debug_info_t* debug_info_create(char *name, int pages_per_area, |
77 | int nr_areas, int buf_size); | |
1da177e4 LT |
78 | static void debug_info_get(debug_info_t *); |
79 | static void debug_info_put(debug_info_t *); | |
80 | static int debug_prolog_level_fn(debug_info_t * id, | |
66a464db | 81 | struct debug_view *view, char *out_buf); |
1da177e4 | 82 | static int debug_input_level_fn(debug_info_t * id, struct debug_view *view, |
66a464db MH |
83 | struct file *file, const char __user *user_buf, |
84 | size_t user_buf_size, loff_t * offset); | |
85 | static int debug_prolog_pages_fn(debug_info_t * id, | |
86 | struct debug_view *view, char *out_buf); | |
87 | static int debug_input_pages_fn(debug_info_t * id, struct debug_view *view, | |
88 | struct file *file, const char __user *user_buf, | |
89 | size_t user_buf_size, loff_t * offset); | |
1da177e4 | 90 | static int debug_input_flush_fn(debug_info_t * id, struct debug_view *view, |
66a464db MH |
91 | struct file *file, const char __user *user_buf, |
92 | size_t user_buf_size, loff_t * offset); | |
1da177e4 | 93 | static int debug_hex_ascii_format_fn(debug_info_t * id, struct debug_view *view, |
66a464db | 94 | char *out_buf, const char *in_buf); |
1da177e4 | 95 | static int debug_raw_format_fn(debug_info_t * id, |
66a464db MH |
96 | struct debug_view *view, char *out_buf, |
97 | const char *in_buf); | |
1da177e4 | 98 | static int debug_raw_header_fn(debug_info_t * id, struct debug_view *view, |
66a464db | 99 | int area, debug_entry_t * entry, char *out_buf); |
1da177e4 LT |
100 | |
101 | static int debug_sprintf_format_fn(debug_info_t * id, struct debug_view *view, | |
66a464db | 102 | char *out_buf, debug_sprintf_entry_t *curr_event); |
1da177e4 LT |
103 | |
104 | /* globals */ | |
105 | ||
106 | struct debug_view debug_raw_view = { | |
107 | "raw", | |
108 | NULL, | |
109 | &debug_raw_header_fn, | |
110 | &debug_raw_format_fn, | |
111 | NULL, | |
112 | NULL | |
113 | }; | |
114 | ||
115 | struct 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 | }; | |
123 | ||
124 | struct debug_view debug_level_view = { | |
125 | "level", | |
126 | &debug_prolog_level_fn, | |
127 | NULL, | |
128 | NULL, | |
129 | &debug_input_level_fn, | |
130 | NULL | |
131 | }; | |
132 | ||
66a464db MH |
133 | struct debug_view debug_pages_view = { |
134 | "pages", | |
135 | &debug_prolog_pages_fn, | |
136 | NULL, | |
137 | NULL, | |
138 | &debug_input_pages_fn, | |
139 | NULL | |
140 | }; | |
141 | ||
1da177e4 LT |
142 | struct debug_view debug_flush_view = { |
143 | "flush", | |
144 | NULL, | |
145 | NULL, | |
146 | NULL, | |
147 | &debug_input_flush_fn, | |
148 | NULL | |
149 | }; | |
150 | ||
151 | struct debug_view debug_sprintf_view = { | |
152 | "sprintf", | |
153 | NULL, | |
154 | &debug_dflt_header_fn, | |
155 | (debug_format_proc_t*)&debug_sprintf_format_fn, | |
156 | NULL, | |
157 | NULL | |
158 | }; | |
159 | ||
160 | ||
161 | unsigned int debug_feature_version = __DEBUG_FEATURE_VERSION; | |
162 | ||
163 | /* static globals */ | |
164 | ||
165 | static debug_info_t *debug_area_first = NULL; | |
166 | static debug_info_t *debug_area_last = NULL; | |
167 | DECLARE_MUTEX(debug_lock); | |
168 | ||
169 | static int initialized; | |
170 | ||
171 | static struct file_operations debug_file_ops = { | |
66a464db | 172 | .owner = THIS_MODULE, |
1da177e4 | 173 | .read = debug_output, |
66a464db | 174 | .write = debug_input, |
1da177e4 LT |
175 | .open = debug_open, |
176 | .release = debug_close, | |
177 | }; | |
178 | ||
66a464db | 179 | static struct dentry *debug_debugfs_root_entry; |
1da177e4 LT |
180 | |
181 | /* functions */ | |
182 | ||
66a464db MH |
183 | /* |
184 | * debug_areas_alloc | |
185 | * - Debug areas are implemented as a threedimensonal array: | |
186 | * areas[areanumber][pagenumber][pageoffset] | |
187 | */ | |
188 | ||
189 | static debug_entry_t*** | |
190 | debug_areas_alloc(int pages_per_area, int nr_areas) | |
191 | { | |
192 | debug_entry_t*** areas; | |
193 | int i,j; | |
194 | ||
195 | areas = (debug_entry_t ***) kmalloc(nr_areas * | |
196 | sizeof(debug_entry_t**), | |
197 | GFP_KERNEL); | |
198 | if (!areas) | |
199 | goto fail_malloc_areas; | |
200 | for (i = 0; i < nr_areas; i++) { | |
201 | areas[i] = (debug_entry_t**) kmalloc(pages_per_area * | |
202 | sizeof(debug_entry_t*),GFP_KERNEL); | |
203 | if (!areas[i]) { | |
204 | goto fail_malloc_areas2; | |
205 | } | |
206 | for(j = 0; j < pages_per_area; j++) { | |
207 | areas[i][j] = (debug_entry_t*)kmalloc(PAGE_SIZE, | |
208 | GFP_KERNEL); | |
209 | if(!areas[i][j]) { | |
210 | for(j--; j >=0 ; j--) { | |
211 | kfree(areas[i][j]); | |
212 | } | |
213 | kfree(areas[i]); | |
214 | goto fail_malloc_areas2; | |
215 | } else { | |
216 | memset(areas[i][j],0,PAGE_SIZE); | |
217 | } | |
218 | } | |
219 | } | |
220 | return areas; | |
221 | ||
222 | fail_malloc_areas2: | |
223 | for(i--; i >= 0; i--){ | |
224 | for(j=0; j < pages_per_area;j++){ | |
225 | kfree(areas[i][j]); | |
226 | } | |
227 | kfree(areas[i]); | |
228 | } | |
229 | kfree(areas); | |
230 | fail_malloc_areas: | |
231 | return NULL; | |
232 | ||
233 | } | |
234 | ||
235 | ||
1da177e4 LT |
236 | /* |
237 | * debug_info_alloc | |
238 | * - alloc new debug-info | |
239 | */ | |
240 | ||
66a464db MH |
241 | static debug_info_t* |
242 | debug_info_alloc(char *name, int pages_per_area, int nr_areas, int buf_size, | |
243 | int level, int mode) | |
1da177e4 LT |
244 | { |
245 | debug_info_t* rc; | |
1da177e4 LT |
246 | |
247 | /* alloc everything */ | |
248 | ||
66a464db | 249 | rc = (debug_info_t*) kmalloc(sizeof(debug_info_t), GFP_KERNEL); |
1da177e4 LT |
250 | if(!rc) |
251 | goto fail_malloc_rc; | |
66a464db MH |
252 | rc->active_entries = (int*)kmalloc(nr_areas * sizeof(int), GFP_KERNEL); |
253 | if(!rc->active_entries) | |
254 | goto fail_malloc_active_entries; | |
255 | memset(rc->active_entries, 0, nr_areas * sizeof(int)); | |
256 | rc->active_pages = (int*)kmalloc(nr_areas * sizeof(int), GFP_KERNEL); | |
257 | if(!rc->active_pages) | |
258 | goto fail_malloc_active_pages; | |
259 | memset(rc->active_pages, 0, nr_areas * sizeof(int)); | |
260 | if((mode == ALL_AREAS) && (pages_per_area != 0)){ | |
261 | rc->areas = debug_areas_alloc(pages_per_area, nr_areas); | |
262 | if(!rc->areas) | |
263 | goto fail_malloc_areas; | |
264 | } else { | |
265 | rc->areas = NULL; | |
1da177e4 LT |
266 | } |
267 | ||
268 | /* initialize members */ | |
269 | ||
270 | spin_lock_init(&rc->lock); | |
66a464db MH |
271 | rc->pages_per_area = pages_per_area; |
272 | rc->nr_areas = nr_areas; | |
273 | rc->active_area = 0; | |
274 | rc->level = level; | |
275 | rc->buf_size = buf_size; | |
276 | rc->entry_size = sizeof(debug_entry_t) + buf_size; | |
277 | strlcpy(rc->name, name, sizeof(rc->name)-1); | |
1da177e4 | 278 | memset(rc->views, 0, DEBUG_MAX_VIEWS * sizeof(struct debug_view *)); |
66a464db MH |
279 | memset(rc->debugfs_entries, 0 ,DEBUG_MAX_VIEWS * |
280 | sizeof(struct dentry*)); | |
1da177e4 LT |
281 | atomic_set(&(rc->ref_count), 0); |
282 | ||
283 | return rc; | |
284 | ||
1da177e4 | 285 | fail_malloc_areas: |
66a464db MH |
286 | kfree(rc->active_pages); |
287 | fail_malloc_active_pages: | |
288 | kfree(rc->active_entries); | |
289 | fail_malloc_active_entries: | |
1da177e4 LT |
290 | kfree(rc); |
291 | fail_malloc_rc: | |
292 | return NULL; | |
293 | } | |
294 | ||
295 | /* | |
66a464db MH |
296 | * debug_areas_free |
297 | * - free all debug areas | |
1da177e4 LT |
298 | */ |
299 | ||
66a464db MH |
300 | static void |
301 | debug_areas_free(debug_info_t* db_info) | |
302 | { | |
303 | int i,j; | |
304 | ||
305 | if(!db_info->areas) | |
306 | return; | |
1da177e4 | 307 | for (i = 0; i < db_info->nr_areas; i++) { |
66a464db MH |
308 | for(j = 0; j < db_info->pages_per_area; j++) { |
309 | kfree(db_info->areas[i][j]); | |
310 | } | |
311 | kfree(db_info->areas[i]); | |
1da177e4 LT |
312 | } |
313 | kfree(db_info->areas); | |
66a464db MH |
314 | db_info->areas = NULL; |
315 | } | |
316 | ||
317 | /* | |
318 | * debug_info_free | |
319 | * - free memory debug-info | |
320 | */ | |
321 | ||
322 | static void | |
323 | debug_info_free(debug_info_t* db_info){ | |
324 | debug_areas_free(db_info); | |
325 | kfree(db_info->active_entries); | |
326 | kfree(db_info->active_pages); | |
1da177e4 LT |
327 | kfree(db_info); |
328 | } | |
329 | ||
330 | /* | |
331 | * debug_info_create | |
332 | * - create new debug-info | |
333 | */ | |
334 | ||
66a464db MH |
335 | static debug_info_t* |
336 | debug_info_create(char *name, int pages_per_area, int nr_areas, int buf_size) | |
1da177e4 LT |
337 | { |
338 | debug_info_t* rc; | |
339 | ||
66a464db MH |
340 | rc = debug_info_alloc(name, pages_per_area, nr_areas, buf_size, |
341 | DEBUG_DEFAULT_LEVEL, ALL_AREAS); | |
1da177e4 LT |
342 | if(!rc) |
343 | goto out; | |
344 | ||
66a464db MH |
345 | /* create root directory */ |
346 | rc->debugfs_root_entry = debugfs_create_dir(rc->name, | |
347 | debug_debugfs_root_entry); | |
1da177e4 LT |
348 | |
349 | /* append new element to linked list */ | |
66a464db | 350 | if (!debug_area_first) { |
1da177e4 LT |
351 | /* first element in list */ |
352 | debug_area_first = rc; | |
353 | rc->prev = NULL; | |
354 | } else { | |
355 | /* append element to end of list */ | |
356 | debug_area_last->next = rc; | |
357 | rc->prev = debug_area_last; | |
358 | } | |
359 | debug_area_last = rc; | |
360 | rc->next = NULL; | |
361 | ||
362 | debug_info_get(rc); | |
363 | out: | |
364 | return rc; | |
365 | } | |
366 | ||
367 | /* | |
368 | * debug_info_copy | |
369 | * - copy debug-info | |
370 | */ | |
371 | ||
66a464db MH |
372 | static debug_info_t* |
373 | debug_info_copy(debug_info_t* in, int mode) | |
1da177e4 | 374 | { |
66a464db | 375 | int i,j; |
1da177e4 | 376 | debug_info_t* rc; |
942eaabd MH |
377 | unsigned long flags; |
378 | ||
379 | /* get a consistent copy of the debug areas */ | |
380 | do { | |
381 | rc = debug_info_alloc(in->name, in->pages_per_area, | |
382 | in->nr_areas, in->buf_size, in->level, mode); | |
383 | spin_lock_irqsave(&in->lock, flags); | |
384 | if(!rc) | |
385 | goto out; | |
386 | /* has something changed in the meantime ? */ | |
387 | if((rc->pages_per_area == in->pages_per_area) && | |
388 | (rc->nr_areas == in->nr_areas)) { | |
389 | break; | |
390 | } | |
391 | spin_unlock_irqrestore(&in->lock, flags); | |
392 | debug_info_free(rc); | |
393 | } while (1); | |
66a464db | 394 | |
66a464db | 395 | if(!rc || (mode == NO_AREAS)) |
1da177e4 LT |
396 | goto out; |
397 | ||
398 | for(i = 0; i < in->nr_areas; i++){ | |
66a464db MH |
399 | for(j = 0; j < in->pages_per_area; j++) { |
400 | memcpy(rc->areas[i][j], in->areas[i][j],PAGE_SIZE); | |
401 | } | |
1da177e4 LT |
402 | } |
403 | out: | |
942eaabd | 404 | spin_unlock_irqrestore(&in->lock, flags); |
1da177e4 LT |
405 | return rc; |
406 | } | |
407 | ||
408 | /* | |
409 | * debug_info_get | |
410 | * - increments reference count for debug-info | |
411 | */ | |
412 | ||
66a464db MH |
413 | static void |
414 | debug_info_get(debug_info_t * db_info) | |
1da177e4 LT |
415 | { |
416 | if (db_info) | |
417 | atomic_inc(&db_info->ref_count); | |
418 | } | |
419 | ||
420 | /* | |
421 | * debug_info_put: | |
422 | * - decreases reference count for debug-info and frees it if necessary | |
423 | */ | |
424 | ||
66a464db MH |
425 | static void |
426 | debug_info_put(debug_info_t *db_info) | |
1da177e4 LT |
427 | { |
428 | int i; | |
429 | ||
430 | if (!db_info) | |
431 | return; | |
432 | if (atomic_dec_and_test(&db_info->ref_count)) { | |
1da177e4 | 433 | for (i = 0; i < DEBUG_MAX_VIEWS; i++) { |
66a464db | 434 | if (!db_info->views[i]) |
1da177e4 | 435 | continue; |
66a464db | 436 | debugfs_remove(db_info->debugfs_entries[i]); |
1da177e4 | 437 | } |
66a464db | 438 | debugfs_remove(db_info->debugfs_root_entry); |
1da177e4 LT |
439 | if(db_info == debug_area_first) |
440 | debug_area_first = db_info->next; | |
441 | if(db_info == debug_area_last) | |
442 | debug_area_last = db_info->prev; | |
443 | if(db_info->prev) db_info->prev->next = db_info->next; | |
444 | if(db_info->next) db_info->next->prev = db_info->prev; | |
445 | debug_info_free(db_info); | |
446 | } | |
447 | } | |
448 | ||
449 | /* | |
450 | * debug_format_entry: | |
451 | * - format one debug entry and return size of formated data | |
452 | */ | |
453 | ||
66a464db MH |
454 | static int |
455 | debug_format_entry(file_private_info_t *p_info) | |
1da177e4 | 456 | { |
1da177e4 LT |
457 | debug_info_t *id_snap = p_info->debug_info_snap; |
458 | struct debug_view *view = p_info->view; | |
459 | debug_entry_t *act_entry; | |
460 | size_t len = 0; | |
461 | if(p_info->act_entry == DEBUG_PROLOG_ENTRY){ | |
462 | /* print prolog */ | |
463 | if (view->prolog_proc) | |
66a464db | 464 | len += view->prolog_proc(id_snap,view,p_info->temp_buf); |
1da177e4 LT |
465 | goto out; |
466 | } | |
66a464db MH |
467 | if (!id_snap->areas) /* this is true, if we have a prolog only view */ |
468 | goto out; /* or if 'pages_per_area' is 0 */ | |
469 | act_entry = (debug_entry_t *) ((char*)id_snap->areas[p_info->act_area] | |
470 | [p_info->act_page] + p_info->act_entry); | |
1da177e4 LT |
471 | |
472 | if (act_entry->id.stck == 0LL) | |
473 | goto out; /* empty entry */ | |
474 | if (view->header_proc) | |
66a464db | 475 | len += view->header_proc(id_snap, view, p_info->act_area, |
1da177e4 LT |
476 | act_entry, p_info->temp_buf + len); |
477 | if (view->format_proc) | |
66a464db | 478 | len += view->format_proc(id_snap, view, p_info->temp_buf + len, |
1da177e4 | 479 | DEBUG_DATA(act_entry)); |
66a464db | 480 | out: |
1da177e4 LT |
481 | return len; |
482 | } | |
483 | ||
484 | /* | |
485 | * debug_next_entry: | |
486 | * - goto next entry in p_info | |
487 | */ | |
488 | ||
4448aaf0 | 489 | static inline int |
66a464db | 490 | debug_next_entry(file_private_info_t *p_info) |
1da177e4 | 491 | { |
66a464db MH |
492 | debug_info_t *id; |
493 | ||
494 | id = p_info->debug_info_snap; | |
1da177e4 LT |
495 | if(p_info->act_entry == DEBUG_PROLOG_ENTRY){ |
496 | p_info->act_entry = 0; | |
66a464db | 497 | p_info->act_page = 0; |
1da177e4 LT |
498 | goto out; |
499 | } | |
66a464db MH |
500 | if(!id->areas) |
501 | return 1; | |
502 | p_info->act_entry += id->entry_size; | |
503 | /* switch to next page, if we reached the end of the page */ | |
504 | if (p_info->act_entry > (PAGE_SIZE - id->entry_size)){ | |
505 | /* next page */ | |
1da177e4 | 506 | p_info->act_entry = 0; |
66a464db MH |
507 | p_info->act_page += 1; |
508 | if((p_info->act_page % id->pages_per_area) == 0) { | |
509 | /* next area */ | |
510 | p_info->act_area++; | |
511 | p_info->act_page=0; | |
512 | } | |
1da177e4 LT |
513 | if(p_info->act_area >= id->nr_areas) |
514 | return 1; | |
515 | } | |
516 | out: | |
517 | return 0; | |
518 | } | |
519 | ||
520 | /* | |
521 | * debug_output: | |
522 | * - called for user read() | |
523 | * - copies formated debug entries to the user buffer | |
524 | */ | |
525 | ||
66a464db MH |
526 | static ssize_t |
527 | debug_output(struct file *file, /* file descriptor */ | |
528 | char __user *user_buf, /* user buffer */ | |
529 | size_t len, /* length of buffer */ | |
530 | loff_t *offset) /* offset in the file */ | |
1da177e4 LT |
531 | { |
532 | size_t count = 0; | |
66a464db | 533 | size_t entry_offset; |
1da177e4 LT |
534 | file_private_info_t *p_info; |
535 | ||
536 | p_info = ((file_private_info_t *) file->private_data); | |
537 | if (*offset != p_info->offset) | |
538 | return -EPIPE; | |
539 | if(p_info->act_area >= p_info->debug_info_snap->nr_areas) | |
540 | return 0; | |
1da177e4 | 541 | entry_offset = p_info->act_entry_offset; |
1da177e4 | 542 | while(count < len){ |
66a464db MH |
543 | int formatted_line_size; |
544 | int formatted_line_residue; | |
545 | int user_buf_residue; | |
546 | size_t copy_size; | |
547 | ||
548 | formatted_line_size = debug_format_entry(p_info); | |
549 | formatted_line_residue = formatted_line_size - entry_offset; | |
550 | user_buf_residue = len-count; | |
551 | copy_size = min(user_buf_residue, formatted_line_residue); | |
552 | if(copy_size){ | |
553 | if (copy_to_user(user_buf + count, p_info->temp_buf | |
554 | + entry_offset, copy_size)) | |
555 | return -EFAULT; | |
556 | count += copy_size; | |
557 | entry_offset += copy_size; | |
1da177e4 | 558 | } |
66a464db MH |
559 | if(copy_size == formatted_line_residue){ |
560 | entry_offset = 0; | |
561 | if(debug_next_entry(p_info)) | |
1da177e4 | 562 | goto out; |
66a464db | 563 | } |
1da177e4 LT |
564 | } |
565 | out: | |
566 | p_info->offset = *offset + count; | |
66a464db | 567 | p_info->act_entry_offset = entry_offset; |
1da177e4 LT |
568 | *offset = p_info->offset; |
569 | return count; | |
570 | } | |
571 | ||
572 | /* | |
573 | * debug_input: | |
574 | * - called for user write() | |
575 | * - calls input function of view | |
576 | */ | |
577 | ||
66a464db MH |
578 | static ssize_t |
579 | debug_input(struct file *file, const char __user *user_buf, size_t length, | |
580 | loff_t *offset) | |
1da177e4 LT |
581 | { |
582 | int rc = 0; | |
583 | file_private_info_t *p_info; | |
584 | ||
585 | down(&debug_lock); | |
586 | p_info = ((file_private_info_t *) file->private_data); | |
587 | if (p_info->view->input_proc) | |
588 | rc = p_info->view->input_proc(p_info->debug_info_org, | |
589 | p_info->view, file, user_buf, | |
590 | length, offset); | |
591 | else | |
592 | rc = -EPERM; | |
593 | up(&debug_lock); | |
594 | return rc; /* number of input characters */ | |
595 | } | |
596 | ||
597 | /* | |
598 | * debug_open: | |
599 | * - called for user open() | |
600 | * - copies formated output to private_data area of the file | |
601 | * handle | |
602 | */ | |
603 | ||
66a464db MH |
604 | static int |
605 | debug_open(struct inode *inode, struct file *file) | |
1da177e4 LT |
606 | { |
607 | int i = 0, rc = 0; | |
608 | file_private_info_t *p_info; | |
609 | debug_info_t *debug_info, *debug_info_snapshot; | |
610 | ||
1da177e4 | 611 | down(&debug_lock); |
942eaabd MH |
612 | debug_info = (struct debug_info*)file->f_dentry->d_inode->u.generic_ip; |
613 | /* find debug view */ | |
614 | for (i = 0; i < DEBUG_MAX_VIEWS; i++) { | |
615 | if (!debug_info->views[i]) | |
616 | continue; | |
617 | else if (debug_info->debugfs_entries[i] == | |
618 | file->f_dentry) { | |
619 | goto found; /* found view ! */ | |
1da177e4 | 620 | } |
1da177e4 LT |
621 | } |
622 | /* no entry found */ | |
623 | rc = -EINVAL; | |
624 | goto out; | |
625 | ||
66a464db | 626 | found: |
1da177e4 | 627 | |
66a464db MH |
628 | /* Make snapshot of current debug areas to get it consistent. */ |
629 | /* To copy all the areas is only needed, if we have a view which */ | |
630 | /* formats the debug areas. */ | |
1da177e4 | 631 | |
66a464db MH |
632 | if(!debug_info->views[i]->format_proc && |
633 | !debug_info->views[i]->header_proc){ | |
634 | debug_info_snapshot = debug_info_copy(debug_info, NO_AREAS); | |
635 | } else { | |
636 | debug_info_snapshot = debug_info_copy(debug_info, ALL_AREAS); | |
637 | } | |
1da177e4 LT |
638 | |
639 | if(!debug_info_snapshot){ | |
1da177e4 LT |
640 | rc = -ENOMEM; |
641 | goto out; | |
642 | } | |
66a464db MH |
643 | p_info = (file_private_info_t *) kmalloc(sizeof(file_private_info_t), |
644 | GFP_KERNEL); | |
645 | if(!p_info){ | |
646 | if(debug_info_snapshot) | |
647 | debug_info_free(debug_info_snapshot); | |
1da177e4 LT |
648 | rc = -ENOMEM; |
649 | goto out; | |
650 | } | |
1da177e4 LT |
651 | p_info->offset = 0; |
652 | p_info->debug_info_snap = debug_info_snapshot; | |
653 | p_info->debug_info_org = debug_info; | |
654 | p_info->view = debug_info->views[i]; | |
655 | p_info->act_area = 0; | |
66a464db | 656 | p_info->act_page = 0; |
1da177e4 LT |
657 | p_info->act_entry = DEBUG_PROLOG_ENTRY; |
658 | p_info->act_entry_offset = 0; | |
66a464db | 659 | file->private_data = p_info; |
1da177e4 | 660 | debug_info_get(debug_info); |
66a464db | 661 | out: |
1da177e4 LT |
662 | up(&debug_lock); |
663 | return rc; | |
664 | } | |
665 | ||
666 | /* | |
667 | * debug_close: | |
668 | * - called for user close() | |
669 | * - deletes private_data area of the file handle | |
670 | */ | |
671 | ||
66a464db MH |
672 | static int |
673 | debug_close(struct inode *inode, struct file *file) | |
1da177e4 LT |
674 | { |
675 | file_private_info_t *p_info; | |
1da177e4 | 676 | p_info = (file_private_info_t *) file->private_data; |
66a464db MH |
677 | if(p_info->debug_info_snap) |
678 | debug_info_free(p_info->debug_info_snap); | |
1da177e4 LT |
679 | debug_info_put(p_info->debug_info_org); |
680 | kfree(file->private_data); | |
681 | return 0; /* success */ | |
682 | } | |
683 | ||
684 | /* | |
685 | * debug_register: | |
686 | * - creates and initializes debug area for the caller | |
687 | * - returns handle for debug area | |
688 | */ | |
689 | ||
66a464db MH |
690 | debug_info_t* |
691 | debug_register (char *name, int pages_per_area, int nr_areas, int buf_size) | |
1da177e4 LT |
692 | { |
693 | debug_info_t *rc = NULL; | |
694 | ||
695 | if (!initialized) | |
696 | BUG(); | |
697 | down(&debug_lock); | |
698 | ||
699 | /* create new debug_info */ | |
700 | ||
66a464db | 701 | rc = debug_info_create(name, pages_per_area, nr_areas, buf_size); |
1da177e4 LT |
702 | if(!rc) |
703 | goto out; | |
704 | debug_register_view(rc, &debug_level_view); | |
705 | debug_register_view(rc, &debug_flush_view); | |
66a464db MH |
706 | debug_register_view(rc, &debug_pages_view); |
707 | out: | |
708 | if (!rc){ | |
1da177e4 LT |
709 | printk(KERN_ERR "debug: debug_register failed for %s\n",name); |
710 | } | |
711 | up(&debug_lock); | |
712 | return rc; | |
713 | } | |
714 | ||
715 | /* | |
716 | * debug_unregister: | |
717 | * - give back debug area | |
718 | */ | |
719 | ||
66a464db MH |
720 | void |
721 | debug_unregister(debug_info_t * id) | |
1da177e4 LT |
722 | { |
723 | if (!id) | |
724 | goto out; | |
725 | down(&debug_lock); | |
1da177e4 LT |
726 | debug_info_put(id); |
727 | up(&debug_lock); | |
728 | ||
66a464db | 729 | out: |
1da177e4 LT |
730 | return; |
731 | } | |
732 | ||
66a464db MH |
733 | /* |
734 | * debug_set_size: | |
735 | * - set area size (number of pages) and number of areas | |
736 | */ | |
737 | static int | |
738 | debug_set_size(debug_info_t* id, int nr_areas, int pages_per_area) | |
739 | { | |
740 | unsigned long flags; | |
741 | debug_entry_t *** new_areas; | |
742 | int rc=0; | |
743 | ||
744 | if(!id || (nr_areas <= 0) || (pages_per_area < 0)) | |
745 | return -EINVAL; | |
746 | if(pages_per_area > 0){ | |
747 | new_areas = debug_areas_alloc(pages_per_area, nr_areas); | |
748 | if(!new_areas) { | |
749 | printk(KERN_WARNING "debug: could not allocate memory "\ | |
750 | "for pagenumber: %i\n",pages_per_area); | |
751 | rc = -ENOMEM; | |
752 | goto out; | |
753 | } | |
754 | } else { | |
755 | new_areas = NULL; | |
756 | } | |
757 | spin_lock_irqsave(&id->lock,flags); | |
758 | debug_areas_free(id); | |
759 | id->areas = new_areas; | |
760 | id->nr_areas = nr_areas; | |
761 | id->pages_per_area = pages_per_area; | |
762 | id->active_area = 0; | |
763 | memset(id->active_entries,0,sizeof(int)*id->nr_areas); | |
764 | memset(id->active_pages, 0, sizeof(int)*id->nr_areas); | |
765 | spin_unlock_irqrestore(&id->lock,flags); | |
766 | printk(KERN_INFO "debug: %s: set new size (%i pages)\n"\ | |
767 | ,id->name, pages_per_area); | |
768 | out: | |
769 | return rc; | |
770 | } | |
771 | ||
1da177e4 LT |
772 | /* |
773 | * debug_set_level: | |
774 | * - set actual debug level | |
775 | */ | |
776 | ||
66a464db MH |
777 | void |
778 | debug_set_level(debug_info_t* id, int new_level) | |
1da177e4 LT |
779 | { |
780 | unsigned long flags; | |
781 | if(!id) | |
782 | return; | |
783 | spin_lock_irqsave(&id->lock,flags); | |
784 | if(new_level == DEBUG_OFF_LEVEL){ | |
785 | id->level = DEBUG_OFF_LEVEL; | |
786 | printk(KERN_INFO "debug: %s: switched off\n",id->name); | |
787 | } else if ((new_level > DEBUG_MAX_LEVEL) || (new_level < 0)) { | |
788 | printk(KERN_INFO | |
789 | "debug: %s: level %i is out of range (%i - %i)\n", | |
790 | id->name, new_level, 0, DEBUG_MAX_LEVEL); | |
791 | } else { | |
792 | id->level = new_level; | |
1da177e4 LT |
793 | } |
794 | spin_unlock_irqrestore(&id->lock,flags); | |
795 | } | |
796 | ||
797 | ||
798 | /* | |
799 | * proceed_active_entry: | |
800 | * - set active entry to next in the ring buffer | |
801 | */ | |
802 | ||
4448aaf0 | 803 | static inline void |
66a464db | 804 | proceed_active_entry(debug_info_t * id) |
1da177e4 | 805 | { |
66a464db MH |
806 | if ((id->active_entries[id->active_area] += id->entry_size) |
807 | > (PAGE_SIZE - id->entry_size)){ | |
808 | id->active_entries[id->active_area] = 0; | |
809 | id->active_pages[id->active_area] = | |
810 | (id->active_pages[id->active_area] + 1) % | |
811 | id->pages_per_area; | |
812 | } | |
1da177e4 LT |
813 | } |
814 | ||
815 | /* | |
816 | * proceed_active_area: | |
817 | * - set active area to next in the ring buffer | |
818 | */ | |
819 | ||
4448aaf0 | 820 | static inline void |
66a464db | 821 | proceed_active_area(debug_info_t * id) |
1da177e4 LT |
822 | { |
823 | id->active_area++; | |
824 | id->active_area = id->active_area % id->nr_areas; | |
825 | } | |
826 | ||
827 | /* | |
828 | * get_active_entry: | |
829 | */ | |
830 | ||
4448aaf0 | 831 | static inline debug_entry_t* |
66a464db | 832 | get_active_entry(debug_info_t * id) |
1da177e4 | 833 | { |
66a464db MH |
834 | return (debug_entry_t *) (((char *) id->areas[id->active_area] |
835 | [id->active_pages[id->active_area]]) + | |
836 | id->active_entries[id->active_area]); | |
1da177e4 LT |
837 | } |
838 | ||
839 | /* | |
840 | * debug_finish_entry: | |
841 | * - set timestamp, caller address, cpu number etc. | |
842 | */ | |
843 | ||
4448aaf0 | 844 | static inline void |
66a464db MH |
845 | debug_finish_entry(debug_info_t * id, debug_entry_t* active, int level, |
846 | int exception) | |
1da177e4 | 847 | { |
942eaabd | 848 | active->id.stck = get_clock(); |
1da177e4 LT |
849 | active->id.fields.cpuid = smp_processor_id(); |
850 | active->caller = __builtin_return_address(0); | |
851 | active->id.fields.exception = exception; | |
852 | active->id.fields.level = level; | |
853 | proceed_active_entry(id); | |
854 | if(exception) | |
855 | proceed_active_area(id); | |
856 | } | |
857 | ||
858 | static int debug_stoppable=1; | |
859 | static int debug_active=1; | |
860 | ||
861 | #define CTL_S390DBF 5677 | |
862 | #define CTL_S390DBF_STOPPABLE 5678 | |
863 | #define CTL_S390DBF_ACTIVE 5679 | |
864 | ||
865 | /* | |
866 | * proc handler for the running debug_active sysctl | |
867 | * always allow read, allow write only if debug_stoppable is set or | |
868 | * if debug_active is already off | |
869 | */ | |
66a464db MH |
870 | static int |
871 | s390dbf_procactive(ctl_table *table, int write, struct file *filp, | |
1da177e4 LT |
872 | void __user *buffer, size_t *lenp, loff_t *ppos) |
873 | { | |
874 | if (!write || debug_stoppable || !debug_active) | |
875 | return proc_dointvec(table, write, filp, buffer, lenp, ppos); | |
876 | else | |
877 | return 0; | |
878 | } | |
879 | ||
880 | ||
881 | static struct ctl_table s390dbf_table[] = { | |
882 | { | |
883 | .ctl_name = CTL_S390DBF_STOPPABLE, | |
884 | .procname = "debug_stoppable", | |
885 | .data = &debug_stoppable, | |
886 | .maxlen = sizeof(int), | |
887 | .mode = S_IRUGO | S_IWUSR, | |
888 | .proc_handler = &proc_dointvec, | |
889 | .strategy = &sysctl_intvec, | |
890 | }, | |
891 | { | |
892 | .ctl_name = CTL_S390DBF_ACTIVE, | |
893 | .procname = "debug_active", | |
894 | .data = &debug_active, | |
895 | .maxlen = sizeof(int), | |
896 | .mode = S_IRUGO | S_IWUSR, | |
897 | .proc_handler = &s390dbf_procactive, | |
898 | .strategy = &sysctl_intvec, | |
899 | }, | |
900 | { .ctl_name = 0 } | |
901 | }; | |
902 | ||
903 | static struct ctl_table s390dbf_dir_table[] = { | |
904 | { | |
905 | .ctl_name = CTL_S390DBF, | |
906 | .procname = "s390dbf", | |
907 | .maxlen = 0, | |
908 | .mode = S_IRUGO | S_IXUGO, | |
909 | .child = s390dbf_table, | |
910 | }, | |
911 | { .ctl_name = 0 } | |
912 | }; | |
913 | ||
914 | struct ctl_table_header *s390dbf_sysctl_header; | |
915 | ||
66a464db MH |
916 | void |
917 | debug_stop_all(void) | |
1da177e4 LT |
918 | { |
919 | if (debug_stoppable) | |
920 | debug_active = 0; | |
921 | } | |
922 | ||
923 | ||
924 | /* | |
925 | * debug_event_common: | |
926 | * - write debug entry with given size | |
927 | */ | |
928 | ||
66a464db MH |
929 | debug_entry_t* |
930 | debug_event_common(debug_info_t * id, int level, const void *buf, int len) | |
1da177e4 LT |
931 | { |
932 | unsigned long flags; | |
933 | debug_entry_t *active; | |
934 | ||
66a464db | 935 | if (!debug_active || !id->areas) |
1da177e4 LT |
936 | return NULL; |
937 | spin_lock_irqsave(&id->lock, flags); | |
938 | active = get_active_entry(id); | |
939 | memset(DEBUG_DATA(active), 0, id->buf_size); | |
940 | memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size)); | |
941 | debug_finish_entry(id, active, level, 0); | |
942 | spin_unlock_irqrestore(&id->lock, flags); | |
943 | ||
944 | return active; | |
945 | } | |
946 | ||
947 | /* | |
948 | * debug_exception_common: | |
949 | * - write debug entry with given size and switch to next debug area | |
950 | */ | |
951 | ||
66a464db MH |
952 | debug_entry_t |
953 | *debug_exception_common(debug_info_t * id, int level, const void *buf, int len) | |
1da177e4 LT |
954 | { |
955 | unsigned long flags; | |
956 | debug_entry_t *active; | |
957 | ||
66a464db | 958 | if (!debug_active || !id->areas) |
1da177e4 LT |
959 | return NULL; |
960 | spin_lock_irqsave(&id->lock, flags); | |
961 | active = get_active_entry(id); | |
962 | memset(DEBUG_DATA(active), 0, id->buf_size); | |
963 | memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size)); | |
964 | debug_finish_entry(id, active, level, 1); | |
965 | spin_unlock_irqrestore(&id->lock, flags); | |
966 | ||
967 | return active; | |
968 | } | |
969 | ||
970 | /* | |
971 | * counts arguments in format string for sprintf view | |
972 | */ | |
973 | ||
4448aaf0 | 974 | static inline int |
66a464db | 975 | debug_count_numargs(char *string) |
1da177e4 LT |
976 | { |
977 | int numargs=0; | |
978 | ||
979 | while(*string) { | |
980 | if(*string++=='%') | |
981 | numargs++; | |
982 | } | |
983 | return(numargs); | |
984 | } | |
985 | ||
986 | /* | |
987 | * debug_sprintf_event: | |
988 | */ | |
989 | ||
66a464db MH |
990 | debug_entry_t* |
991 | debug_sprintf_event(debug_info_t* id, int level,char *string,...) | |
1da177e4 LT |
992 | { |
993 | va_list ap; | |
994 | int numargs,idx; | |
995 | unsigned long flags; | |
996 | debug_sprintf_entry_t *curr_event; | |
997 | debug_entry_t *active; | |
998 | ||
999 | if((!id) || (level > id->level)) | |
1000 | return NULL; | |
66a464db | 1001 | if (!debug_active || !id->areas) |
1da177e4 LT |
1002 | return NULL; |
1003 | numargs=debug_count_numargs(string); | |
1004 | ||
1005 | spin_lock_irqsave(&id->lock, flags); | |
1006 | active = get_active_entry(id); | |
1007 | curr_event=(debug_sprintf_entry_t *) DEBUG_DATA(active); | |
1008 | va_start(ap,string); | |
1009 | curr_event->string=string; | |
1010 | for(idx=0;idx<min(numargs,(int)(id->buf_size / sizeof(long))-1);idx++) | |
1011 | curr_event->args[idx]=va_arg(ap,long); | |
1012 | va_end(ap); | |
1013 | debug_finish_entry(id, active, level, 0); | |
1014 | spin_unlock_irqrestore(&id->lock, flags); | |
1015 | ||
1016 | return active; | |
1017 | } | |
1018 | ||
1019 | /* | |
1020 | * debug_sprintf_exception: | |
1021 | */ | |
1022 | ||
66a464db MH |
1023 | debug_entry_t* |
1024 | debug_sprintf_exception(debug_info_t* id, int level,char *string,...) | |
1da177e4 LT |
1025 | { |
1026 | va_list ap; | |
1027 | int numargs,idx; | |
1028 | unsigned long flags; | |
1029 | debug_sprintf_entry_t *curr_event; | |
1030 | debug_entry_t *active; | |
1031 | ||
1032 | if((!id) || (level > id->level)) | |
1033 | return NULL; | |
66a464db | 1034 | if (!debug_active || !id->areas) |
1da177e4 LT |
1035 | return NULL; |
1036 | ||
1037 | numargs=debug_count_numargs(string); | |
1038 | ||
1039 | spin_lock_irqsave(&id->lock, flags); | |
1040 | active = get_active_entry(id); | |
1041 | curr_event=(debug_sprintf_entry_t *)DEBUG_DATA(active); | |
1042 | va_start(ap,string); | |
1043 | curr_event->string=string; | |
1044 | for(idx=0;idx<min(numargs,(int)(id->buf_size / sizeof(long))-1);idx++) | |
1045 | curr_event->args[idx]=va_arg(ap,long); | |
1046 | va_end(ap); | |
1047 | debug_finish_entry(id, active, level, 1); | |
1048 | spin_unlock_irqrestore(&id->lock, flags); | |
1049 | ||
1050 | return active; | |
1051 | } | |
1052 | ||
1053 | /* | |
1054 | * debug_init: | |
1055 | * - is called exactly once to initialize the debug feature | |
1056 | */ | |
1057 | ||
66a464db MH |
1058 | static int |
1059 | __init debug_init(void) | |
1da177e4 LT |
1060 | { |
1061 | int rc = 0; | |
1062 | ||
1063 | s390dbf_sysctl_header = register_sysctl_table(s390dbf_dir_table, 1); | |
1064 | down(&debug_lock); | |
66a464db | 1065 | debug_debugfs_root_entry = debugfs_create_dir(DEBUG_DIR_ROOT,NULL); |
1da177e4 LT |
1066 | printk(KERN_INFO "debug: Initialization complete\n"); |
1067 | initialized = 1; | |
1068 | up(&debug_lock); | |
1069 | ||
1070 | return rc; | |
1071 | } | |
1072 | ||
1073 | /* | |
1074 | * debug_register_view: | |
1075 | */ | |
1076 | ||
66a464db MH |
1077 | int |
1078 | debug_register_view(debug_info_t * id, struct debug_view *view) | |
1da177e4 LT |
1079 | { |
1080 | int rc = 0; | |
1081 | int i; | |
1082 | unsigned long flags; | |
1083 | mode_t mode = S_IFREG; | |
66a464db | 1084 | struct dentry *pde; |
1da177e4 LT |
1085 | |
1086 | if (!id) | |
1087 | goto out; | |
1088 | if (view->prolog_proc || view->format_proc || view->header_proc) | |
1089 | mode |= S_IRUSR; | |
1090 | if (view->input_proc) | |
1091 | mode |= S_IWUSR; | |
66a464db | 1092 | pde = debugfs_create_file(view->name, mode, id->debugfs_root_entry, |
942eaabd | 1093 | id , &debug_file_ops); |
1da177e4 | 1094 | if (!pde){ |
66a464db MH |
1095 | printk(KERN_WARNING "debug: debugfs_create_file() failed!"\ |
1096 | " Cannot register view %s/%s\n", id->name,view->name); | |
1da177e4 LT |
1097 | rc = -1; |
1098 | goto out; | |
1099 | } | |
1da177e4 LT |
1100 | spin_lock_irqsave(&id->lock, flags); |
1101 | for (i = 0; i < DEBUG_MAX_VIEWS; i++) { | |
66a464db | 1102 | if (!id->views[i]) |
1da177e4 LT |
1103 | break; |
1104 | } | |
1105 | if (i == DEBUG_MAX_VIEWS) { | |
1106 | printk(KERN_WARNING "debug: cannot register view %s/%s\n", | |
1107 | id->name,view->name); | |
1108 | printk(KERN_WARNING | |
1109 | "debug: maximum number of views reached (%i)!\n", i); | |
66a464db | 1110 | debugfs_remove(pde); |
1da177e4 | 1111 | rc = -1; |
66a464db | 1112 | } else { |
1da177e4 | 1113 | id->views[i] = view; |
66a464db | 1114 | id->debugfs_entries[i] = pde; |
1da177e4 LT |
1115 | } |
1116 | spin_unlock_irqrestore(&id->lock, flags); | |
66a464db | 1117 | out: |
1da177e4 LT |
1118 | return rc; |
1119 | } | |
1120 | ||
1121 | /* | |
1122 | * debug_unregister_view: | |
1123 | */ | |
1124 | ||
66a464db MH |
1125 | int |
1126 | debug_unregister_view(debug_info_t * id, struct debug_view *view) | |
1da177e4 LT |
1127 | { |
1128 | int rc = 0; | |
1129 | int i; | |
1130 | unsigned long flags; | |
1131 | ||
1132 | if (!id) | |
1133 | goto out; | |
1134 | spin_lock_irqsave(&id->lock, flags); | |
1135 | for (i = 0; i < DEBUG_MAX_VIEWS; i++) { | |
1136 | if (id->views[i] == view) | |
1137 | break; | |
1138 | } | |
1139 | if (i == DEBUG_MAX_VIEWS) | |
1140 | rc = -1; | |
1141 | else { | |
66a464db | 1142 | debugfs_remove(id->debugfs_entries[i]); |
1da177e4 LT |
1143 | id->views[i] = NULL; |
1144 | rc = 0; | |
1145 | } | |
1146 | spin_unlock_irqrestore(&id->lock, flags); | |
66a464db MH |
1147 | out: |
1148 | return rc; | |
1149 | } | |
1150 | ||
1151 | static inline char * | |
1152 | debug_get_user_string(const char __user *user_buf, size_t user_len) | |
1153 | { | |
1154 | char* buffer; | |
1155 | ||
1156 | buffer = kmalloc(user_len + 1, GFP_KERNEL); | |
1157 | if (!buffer) | |
1158 | return ERR_PTR(-ENOMEM); | |
1159 | if (copy_from_user(buffer, user_buf, user_len) != 0) { | |
1160 | kfree(buffer); | |
1161 | return ERR_PTR(-EFAULT); | |
1162 | } | |
1163 | /* got the string, now strip linefeed. */ | |
1164 | if (buffer[user_len - 1] == '\n') | |
1165 | buffer[user_len - 1] = 0; | |
1166 | else | |
1167 | buffer[user_len] = 0; | |
1168 | return buffer; | |
1169 | } | |
1170 | ||
1171 | static inline int | |
1172 | debug_get_uint(char *buf) | |
1173 | { | |
1174 | int rc; | |
1175 | ||
1176 | for(; isspace(*buf); buf++); | |
1177 | rc = simple_strtoul(buf, &buf, 10); | |
1178 | if(*buf){ | |
1179 | printk("debug: no integer specified!\n"); | |
1180 | rc = -EINVAL; | |
1181 | } | |
1da177e4 LT |
1182 | return rc; |
1183 | } | |
1184 | ||
1185 | /* | |
1186 | * functions for debug-views | |
1187 | *********************************** | |
1188 | */ | |
1189 | ||
1190 | /* | |
1191 | * prints out actual debug level | |
1192 | */ | |
1193 | ||
66a464db MH |
1194 | static int |
1195 | debug_prolog_pages_fn(debug_info_t * id, | |
1da177e4 | 1196 | struct debug_view *view, char *out_buf) |
66a464db MH |
1197 | { |
1198 | return sprintf(out_buf, "%i\n", id->pages_per_area); | |
1199 | } | |
1200 | ||
1201 | /* | |
1202 | * reads new size (number of pages per debug area) | |
1203 | */ | |
1204 | ||
1205 | static int | |
1206 | debug_input_pages_fn(debug_info_t * id, struct debug_view *view, | |
1207 | struct file *file, const char __user *user_buf, | |
1208 | size_t user_len, loff_t * offset) | |
1209 | { | |
1210 | char *str; | |
1211 | int rc,new_pages; | |
1212 | ||
1213 | if (user_len > 0x10000) | |
1214 | user_len = 0x10000; | |
1215 | if (*offset != 0){ | |
1216 | rc = -EPIPE; | |
1217 | goto out; | |
1218 | } | |
1219 | str = debug_get_user_string(user_buf,user_len); | |
1220 | if(IS_ERR(str)){ | |
1221 | rc = PTR_ERR(str); | |
1222 | goto out; | |
1223 | } | |
1224 | new_pages = debug_get_uint(str); | |
1225 | if(new_pages < 0){ | |
1226 | rc = -EINVAL; | |
1227 | goto free_str; | |
1228 | } | |
1229 | rc = debug_set_size(id,id->nr_areas, new_pages); | |
1230 | if(rc != 0){ | |
1231 | rc = -EINVAL; | |
1232 | goto free_str; | |
1233 | } | |
1234 | rc = user_len; | |
1235 | free_str: | |
1236 | kfree(str); | |
1237 | out: | |
1238 | *offset += user_len; | |
1239 | return rc; /* number of input characters */ | |
1240 | } | |
1241 | ||
1242 | /* | |
1243 | * prints out actual debug level | |
1244 | */ | |
1245 | ||
1246 | static int | |
1247 | debug_prolog_level_fn(debug_info_t * id, struct debug_view *view, char *out_buf) | |
1da177e4 LT |
1248 | { |
1249 | int rc = 0; | |
1250 | ||
66a464db MH |
1251 | if(id->level == DEBUG_OFF_LEVEL) { |
1252 | rc = sprintf(out_buf,"-\n"); | |
1253 | } | |
1254 | else { | |
1255 | rc = sprintf(out_buf, "%i\n", id->level); | |
1256 | } | |
1da177e4 LT |
1257 | return rc; |
1258 | } | |
1259 | ||
1260 | /* | |
1261 | * reads new debug level | |
1262 | */ | |
1263 | ||
66a464db MH |
1264 | static int |
1265 | debug_input_level_fn(debug_info_t * id, struct debug_view *view, | |
1266 | struct file *file, const char __user *user_buf, | |
1267 | size_t user_len, loff_t * offset) | |
1da177e4 | 1268 | { |
66a464db MH |
1269 | char *str; |
1270 | int rc,new_level; | |
1da177e4 | 1271 | |
66a464db MH |
1272 | if (user_len > 0x10000) |
1273 | user_len = 0x10000; | |
1274 | if (*offset != 0){ | |
1275 | rc = -EPIPE; | |
1da177e4 | 1276 | goto out; |
66a464db MH |
1277 | } |
1278 | str = debug_get_user_string(user_buf,user_len); | |
1279 | if(IS_ERR(str)){ | |
1280 | rc = PTR_ERR(str); | |
1da177e4 LT |
1281 | goto out; |
1282 | } | |
66a464db | 1283 | if(str[0] == '-'){ |
1da177e4 | 1284 | debug_set_level(id, DEBUG_OFF_LEVEL); |
66a464db MH |
1285 | rc = user_len; |
1286 | goto free_str; | |
1da177e4 | 1287 | } else { |
66a464db | 1288 | new_level = debug_get_uint(str); |
1da177e4 | 1289 | } |
66a464db MH |
1290 | if(new_level < 0) { |
1291 | printk(KERN_INFO "debug: level `%s` is not valid\n", str); | |
1292 | rc = -EINVAL; | |
1293 | } else { | |
1294 | debug_set_level(id, new_level); | |
1295 | rc = user_len; | |
1296 | } | |
1297 | free_str: | |
1298 | kfree(str); | |
1299 | out: | |
1300 | *offset += user_len; | |
1da177e4 LT |
1301 | return rc; /* number of input characters */ |
1302 | } | |
1303 | ||
1304 | ||
1305 | /* | |
1306 | * flushes debug areas | |
1307 | */ | |
1308 | ||
66a464db MH |
1309 | void |
1310 | debug_flush(debug_info_t* id, int area) | |
1da177e4 LT |
1311 | { |
1312 | unsigned long flags; | |
66a464db | 1313 | int i,j; |
1da177e4 | 1314 | |
66a464db | 1315 | if(!id || !id->areas) |
1da177e4 LT |
1316 | return; |
1317 | spin_lock_irqsave(&id->lock,flags); | |
1318 | if(area == DEBUG_FLUSH_ALL){ | |
1319 | id->active_area = 0; | |
66a464db MH |
1320 | memset(id->active_entries, 0, id->nr_areas * sizeof(int)); |
1321 | for (i = 0; i < id->nr_areas; i++) { | |
1322 | id->active_pages[i] = 0; | |
1323 | for(j = 0; j < id->pages_per_area; j++) { | |
1324 | memset(id->areas[i][j], 0, PAGE_SIZE); | |
1325 | } | |
1326 | } | |
1da177e4 LT |
1327 | printk(KERN_INFO "debug: %s: all areas flushed\n",id->name); |
1328 | } else if(area >= 0 && area < id->nr_areas) { | |
66a464db MH |
1329 | id->active_entries[area] = 0; |
1330 | id->active_pages[area] = 0; | |
1331 | for(i = 0; i < id->pages_per_area; i++) { | |
1332 | memset(id->areas[area][i],0,PAGE_SIZE); | |
1333 | } | |
1334 | printk(KERN_INFO "debug: %s: area %i has been flushed\n", | |
1da177e4 LT |
1335 | id->name, area); |
1336 | } else { | |
1337 | printk(KERN_INFO | |
66a464db | 1338 | "debug: %s: area %i cannot be flushed (range: %i - %i)\n", |
1da177e4 LT |
1339 | id->name, area, 0, id->nr_areas-1); |
1340 | } | |
1341 | spin_unlock_irqrestore(&id->lock,flags); | |
1342 | } | |
1343 | ||
1344 | /* | |
1345 | * view function: flushes debug areas | |
1346 | */ | |
1347 | ||
66a464db MH |
1348 | static int |
1349 | debug_input_flush_fn(debug_info_t * id, struct debug_view *view, | |
1350 | struct file *file, const char __user *user_buf, | |
1351 | size_t user_len, loff_t * offset) | |
1da177e4 LT |
1352 | { |
1353 | char input_buf[1]; | |
66a464db MH |
1354 | int rc = user_len; |
1355 | ||
1356 | if (user_len > 0x10000) | |
1357 | user_len = 0x10000; | |
1358 | if (*offset != 0){ | |
1359 | rc = -EPIPE; | |
1da177e4 | 1360 | goto out; |
66a464db | 1361 | } |
1da177e4 LT |
1362 | if (copy_from_user(input_buf, user_buf, 1)){ |
1363 | rc = -EFAULT; | |
1364 | goto out; | |
1365 | } | |
1366 | if(input_buf[0] == '-') { | |
1367 | debug_flush(id, DEBUG_FLUSH_ALL); | |
1368 | goto out; | |
1369 | } | |
1370 | if (isdigit(input_buf[0])) { | |
1371 | int area = ((int) input_buf[0] - (int) '0'); | |
1372 | debug_flush(id, area); | |
1373 | goto out; | |
1374 | } | |
1375 | ||
1376 | printk(KERN_INFO "debug: area `%c` is not valid\n", input_buf[0]); | |
1377 | ||
66a464db MH |
1378 | out: |
1379 | *offset += user_len; | |
1da177e4 LT |
1380 | return rc; /* number of input characters */ |
1381 | } | |
1382 | ||
1383 | /* | |
1384 | * prints debug header in raw format | |
1385 | */ | |
1386 | ||
66a464db MH |
1387 | static int |
1388 | debug_raw_header_fn(debug_info_t * id, struct debug_view *view, | |
1389 | int area, debug_entry_t * entry, char *out_buf) | |
1da177e4 LT |
1390 | { |
1391 | int rc; | |
1392 | ||
1393 | rc = sizeof(debug_entry_t); | |
1394 | memcpy(out_buf,entry,sizeof(debug_entry_t)); | |
1395 | return rc; | |
1396 | } | |
1397 | ||
1398 | /* | |
1399 | * prints debug data in raw format | |
1400 | */ | |
1401 | ||
66a464db MH |
1402 | static int |
1403 | debug_raw_format_fn(debug_info_t * id, struct debug_view *view, | |
1da177e4 LT |
1404 | char *out_buf, const char *in_buf) |
1405 | { | |
1406 | int rc; | |
1407 | ||
1408 | rc = id->buf_size; | |
1409 | memcpy(out_buf, in_buf, id->buf_size); | |
1410 | return rc; | |
1411 | } | |
1412 | ||
1413 | /* | |
1414 | * prints debug data in hex/ascii format | |
1415 | */ | |
1416 | ||
66a464db MH |
1417 | static int |
1418 | debug_hex_ascii_format_fn(debug_info_t * id, struct debug_view *view, | |
1419 | char *out_buf, const char *in_buf) | |
1da177e4 LT |
1420 | { |
1421 | int i, rc = 0; | |
1422 | ||
1423 | for (i = 0; i < id->buf_size; i++) { | |
1424 | rc += sprintf(out_buf + rc, "%02x ", | |
1425 | ((unsigned char *) in_buf)[i]); | |
1426 | } | |
1427 | rc += sprintf(out_buf + rc, "| "); | |
1428 | for (i = 0; i < id->buf_size; i++) { | |
1429 | unsigned char c = in_buf[i]; | |
1430 | if (!isprint(c)) | |
1431 | rc += sprintf(out_buf + rc, "."); | |
1432 | else | |
1433 | rc += sprintf(out_buf + rc, "%c", c); | |
1434 | } | |
1435 | rc += sprintf(out_buf + rc, "\n"); | |
1436 | return rc; | |
1437 | } | |
1438 | ||
1439 | /* | |
1440 | * prints header for debug entry | |
1441 | */ | |
1442 | ||
66a464db MH |
1443 | int |
1444 | debug_dflt_header_fn(debug_info_t * id, struct debug_view *view, | |
1da177e4 LT |
1445 | int area, debug_entry_t * entry, char *out_buf) |
1446 | { | |
942eaabd | 1447 | struct timespec time_spec; |
1da177e4 LT |
1448 | unsigned long long time; |
1449 | char *except_str; | |
1450 | unsigned long caller; | |
1451 | int rc = 0; | |
1452 | unsigned int level; | |
1453 | ||
1454 | level = entry->id.fields.level; | |
1455 | time = entry->id.stck; | |
1456 | /* adjust todclock to 1970 */ | |
1457 | time -= 0x8126d60e46000000LL - (0x3c26700LL * 1000000 * 4096); | |
942eaabd | 1458 | tod_to_timeval(time, &time_spec); |
1da177e4 LT |
1459 | |
1460 | if (entry->id.fields.exception) | |
1461 | except_str = "*"; | |
1462 | else | |
1463 | except_str = "-"; | |
1464 | caller = ((unsigned long) entry->caller) & PSW_ADDR_INSN; | |
1465 | rc += sprintf(out_buf, "%02i %011lu:%06lu %1u %1s %02i %p ", | |
942eaabd | 1466 | area, time_spec.tv_sec, time_spec.tv_nsec / 1000, level, |
1da177e4 LT |
1467 | except_str, entry->id.fields.cpuid, (void *) caller); |
1468 | return rc; | |
1469 | } | |
1470 | ||
1471 | /* | |
1472 | * prints debug data sprintf-formated: | |
1473 | * debug_sprinf_event/exception calls must be used together with this view | |
1474 | */ | |
1475 | ||
1476 | #define DEBUG_SPRINTF_MAX_ARGS 10 | |
1477 | ||
66a464db MH |
1478 | static int |
1479 | debug_sprintf_format_fn(debug_info_t * id, struct debug_view *view, | |
1480 | char *out_buf, debug_sprintf_entry_t *curr_event) | |
1da177e4 LT |
1481 | { |
1482 | int num_longs, num_used_args = 0,i, rc = 0; | |
1483 | int index[DEBUG_SPRINTF_MAX_ARGS]; | |
1484 | ||
1485 | /* count of longs fit into one entry */ | |
1486 | num_longs = id->buf_size / sizeof(long); | |
1487 | ||
1488 | if(num_longs < 1) | |
1489 | goto out; /* bufsize of entry too small */ | |
1490 | if(num_longs == 1) { | |
1491 | /* no args, we use only the string */ | |
1492 | strcpy(out_buf, curr_event->string); | |
1493 | rc = strlen(curr_event->string); | |
1494 | goto out; | |
1495 | } | |
1496 | ||
1497 | /* number of arguments used for sprintf (without the format string) */ | |
1498 | num_used_args = min(DEBUG_SPRINTF_MAX_ARGS, (num_longs - 1)); | |
1499 | ||
1500 | memset(index,0, DEBUG_SPRINTF_MAX_ARGS * sizeof(int)); | |
1501 | ||
1502 | for(i = 0; i < num_used_args; i++) | |
1503 | index[i] = i; | |
1504 | ||
1505 | rc = sprintf(out_buf, curr_event->string, curr_event->args[index[0]], | |
1506 | curr_event->args[index[1]], curr_event->args[index[2]], | |
1507 | curr_event->args[index[3]], curr_event->args[index[4]], | |
1508 | curr_event->args[index[5]], curr_event->args[index[6]], | |
1509 | curr_event->args[index[7]], curr_event->args[index[8]], | |
1510 | curr_event->args[index[9]]); | |
1511 | ||
1512 | out: | |
1513 | ||
1514 | return rc; | |
1515 | } | |
1516 | ||
1517 | /* | |
1518 | * clean up module | |
1519 | */ | |
66a464db MH |
1520 | void |
1521 | __exit debug_exit(void) | |
1da177e4 | 1522 | { |
66a464db | 1523 | debugfs_remove(debug_debugfs_root_entry); |
1da177e4 LT |
1524 | unregister_sysctl_table(s390dbf_sysctl_header); |
1525 | return; | |
1526 | } | |
1527 | ||
1528 | /* | |
1529 | * module definitions | |
1530 | */ | |
66a464db | 1531 | postcore_initcall(debug_init); |
1da177e4 LT |
1532 | module_exit(debug_exit); |
1533 | MODULE_LICENSE("GPL"); | |
1534 | ||
1535 | EXPORT_SYMBOL(debug_register); | |
1536 | EXPORT_SYMBOL(debug_unregister); | |
1537 | EXPORT_SYMBOL(debug_set_level); | |
1538 | EXPORT_SYMBOL(debug_stop_all); | |
1539 | EXPORT_SYMBOL(debug_register_view); | |
1540 | EXPORT_SYMBOL(debug_unregister_view); | |
1541 | EXPORT_SYMBOL(debug_event_common); | |
1542 | EXPORT_SYMBOL(debug_exception_common); | |
1543 | EXPORT_SYMBOL(debug_hex_ascii_view); | |
1544 | EXPORT_SYMBOL(debug_raw_view); | |
1545 | EXPORT_SYMBOL(debug_dflt_header_fn); | |
1546 | EXPORT_SYMBOL(debug_sprintf_view); | |
1547 | EXPORT_SYMBOL(debug_sprintf_exception); | |
1548 | EXPORT_SYMBOL(debug_sprintf_event); |