Commit | Line | Data |
---|---|---|
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 | ||
1da177e4 LT |
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 <asm/semaphore.h> | |
1da177e4 LT |
21 | #include <linux/module.h> |
22 | #include <linux/init.h> | |
66a464db MH |
23 | #include <linux/fs.h> |
24 | #include <linux/debugfs.h> | |
1da177e4 LT |
25 | |
26 | #include <asm/debug.h> | |
27 | ||
28 | #define DEBUG_PROLOG_ENTRY -1 | |
29 | ||
66a464db MH |
30 | #define ALL_AREAS 0 /* copy all debug areas */ |
31 | #define NO_AREAS 1 /* copy no debug areas */ | |
32 | ||
1da177e4 LT |
33 | /* typedefs */ |
34 | ||
35 | typedef struct file_private_info { | |
36 | loff_t offset; /* offset of last read in file */ | |
37 | int act_area; /* number of last formated area */ | |
66a464db | 38 | int act_page; /* act page in given area */ |
1da177e4 LT |
39 | int act_entry; /* last formated entry (offset */ |
40 | /* relative to beginning of last */ | |
66a464db | 41 | /* formated page) */ |
1da177e4 LT |
42 | size_t act_entry_offset; /* up to this offset we copied */ |
43 | /* in last read the last formated */ | |
44 | /* entry to userland */ | |
45 | char temp_buf[2048]; /* buffer for output */ | |
46 | debug_info_t *debug_info_org; /* original debug information */ | |
47 | debug_info_t *debug_info_snap; /* snapshot of debug information */ | |
48 | struct debug_view *view; /* used view of debug info */ | |
49 | } file_private_info_t; | |
50 | ||
51 | typedef struct | |
52 | { | |
53 | char *string; | |
54 | /* | |
55 | * This assumes that all args are converted into longs | |
56 | * on L/390 this is the case for all types of parameter | |
57 | * except of floats, and long long (32 bit) | |
66a464db MH |
58 | * |
59 | */ | |
1da177e4 LT |
60 | long args[0]; |
61 | } debug_sprintf_entry_t; | |
62 | ||
63 | ||
942eaabd | 64 | extern void tod_to_timeval(uint64_t todval, struct timespec *xtime); |
1da177e4 LT |
65 | |
66 | /* internal function prototyes */ | |
67 | ||
68 | static int debug_init(void); | |
69 | static ssize_t debug_output(struct file *file, char __user *user_buf, | |
66a464db | 70 | size_t user_len, loff_t * offset); |
1da177e4 | 71 | static ssize_t debug_input(struct file *file, const char __user *user_buf, |
66a464db | 72 | size_t user_len, loff_t * offset); |
1da177e4 LT |
73 | static int debug_open(struct inode *inode, struct file *file); |
74 | static int debug_close(struct inode *inode, struct file *file); | |
66a464db MH |
75 | static debug_info_t* debug_info_create(char *name, int pages_per_area, |
76 | int nr_areas, int buf_size); | |
1da177e4 LT |
77 | static void debug_info_get(debug_info_t *); |
78 | static void debug_info_put(debug_info_t *); | |
79 | static int debug_prolog_level_fn(debug_info_t * id, | |
66a464db | 80 | struct debug_view *view, char *out_buf); |
1da177e4 | 81 | static int debug_input_level_fn(debug_info_t * id, struct debug_view *view, |
66a464db MH |
82 | struct file *file, const char __user *user_buf, |
83 | size_t user_buf_size, loff_t * offset); | |
84 | static int debug_prolog_pages_fn(debug_info_t * id, | |
85 | struct debug_view *view, char *out_buf); | |
86 | static int debug_input_pages_fn(debug_info_t * id, struct debug_view *view, | |
87 | struct file *file, const char __user *user_buf, | |
88 | size_t user_buf_size, loff_t * offset); | |
1da177e4 | 89 | static int debug_input_flush_fn(debug_info_t * id, struct debug_view *view, |
66a464db MH |
90 | struct file *file, const char __user *user_buf, |
91 | size_t user_buf_size, loff_t * offset); | |
1da177e4 | 92 | static int debug_hex_ascii_format_fn(debug_info_t * id, struct debug_view *view, |
66a464db | 93 | char *out_buf, const char *in_buf); |
1da177e4 | 94 | static int debug_raw_format_fn(debug_info_t * id, |
66a464db MH |
95 | struct debug_view *view, char *out_buf, |
96 | const char *in_buf); | |
1da177e4 | 97 | static int debug_raw_header_fn(debug_info_t * id, struct debug_view *view, |
66a464db | 98 | int area, debug_entry_t * entry, char *out_buf); |
1da177e4 LT |
99 | |
100 | static int debug_sprintf_format_fn(debug_info_t * id, struct debug_view *view, | |
66a464db | 101 | char *out_buf, debug_sprintf_entry_t *curr_event); |
1da177e4 LT |
102 | |
103 | /* globals */ | |
104 | ||
105 | struct debug_view debug_raw_view = { | |
106 | "raw", | |
107 | NULL, | |
108 | &debug_raw_header_fn, | |
109 | &debug_raw_format_fn, | |
110 | NULL, | |
111 | NULL | |
112 | }; | |
113 | ||
114 | struct debug_view debug_hex_ascii_view = { | |
115 | "hex_ascii", | |
116 | NULL, | |
117 | &debug_dflt_header_fn, | |
118 | &debug_hex_ascii_format_fn, | |
119 | NULL, | |
120 | NULL | |
121 | }; | |
122 | ||
2b67fc46 | 123 | static struct debug_view debug_level_view = { |
1da177e4 LT |
124 | "level", |
125 | &debug_prolog_level_fn, | |
126 | NULL, | |
127 | NULL, | |
128 | &debug_input_level_fn, | |
129 | NULL | |
130 | }; | |
131 | ||
2b67fc46 | 132 | static struct debug_view debug_pages_view = { |
66a464db MH |
133 | "pages", |
134 | &debug_prolog_pages_fn, | |
135 | NULL, | |
136 | NULL, | |
137 | &debug_input_pages_fn, | |
138 | NULL | |
139 | }; | |
140 | ||
2b67fc46 | 141 | static struct debug_view debug_flush_view = { |
1da177e4 LT |
142 | "flush", |
143 | NULL, | |
144 | NULL, | |
145 | NULL, | |
146 | &debug_input_flush_fn, | |
147 | NULL | |
148 | }; | |
149 | ||
150 | struct debug_view debug_sprintf_view = { | |
151 | "sprintf", | |
152 | NULL, | |
153 | &debug_dflt_header_fn, | |
154 | (debug_format_proc_t*)&debug_sprintf_format_fn, | |
155 | NULL, | |
156 | NULL | |
157 | }; | |
158 | ||
2b67fc46 | 159 | /* used by dump analysis tools to determine version of debug feature */ |
1da177e4 LT |
160 | unsigned int debug_feature_version = __DEBUG_FEATURE_VERSION; |
161 | ||
162 | /* static globals */ | |
163 | ||
164 | static debug_info_t *debug_area_first = NULL; | |
165 | static debug_info_t *debug_area_last = NULL; | |
2b67fc46 | 166 | static DECLARE_MUTEX(debug_lock); |
1da177e4 LT |
167 | |
168 | static int initialized; | |
169 | ||
5dfe4c96 | 170 | static const struct file_operations debug_file_ops = { |
66a464db | 171 | .owner = THIS_MODULE, |
1da177e4 | 172 | .read = debug_output, |
66a464db | 173 | .write = debug_input, |
1da177e4 LT |
174 | .open = debug_open, |
175 | .release = debug_close, | |
176 | }; | |
177 | ||
66a464db | 178 | static struct dentry *debug_debugfs_root_entry; |
1da177e4 LT |
179 | |
180 | /* functions */ | |
181 | ||
66a464db MH |
182 | /* |
183 | * debug_areas_alloc | |
184 | * - Debug areas are implemented as a threedimensonal array: | |
185 | * areas[areanumber][pagenumber][pageoffset] | |
186 | */ | |
187 | ||
188 | static debug_entry_t*** | |
189 | debug_areas_alloc(int pages_per_area, int nr_areas) | |
190 | { | |
191 | debug_entry_t*** areas; | |
192 | int i,j; | |
193 | ||
5cbded58 | 194 | areas = kmalloc(nr_areas * |
66a464db MH |
195 | sizeof(debug_entry_t**), |
196 | GFP_KERNEL); | |
197 | if (!areas) | |
198 | goto fail_malloc_areas; | |
199 | for (i = 0; i < nr_areas; i++) { | |
5cbded58 | 200 | areas[i] = kmalloc(pages_per_area * |
66a464db MH |
201 | sizeof(debug_entry_t*),GFP_KERNEL); |
202 | if (!areas[i]) { | |
203 | goto fail_malloc_areas2; | |
204 | } | |
205 | for(j = 0; j < pages_per_area; j++) { | |
fb630517 | 206 | areas[i][j] = kzalloc(PAGE_SIZE, GFP_KERNEL); |
66a464db MH |
207 | if(!areas[i][j]) { |
208 | for(j--; j >=0 ; j--) { | |
209 | kfree(areas[i][j]); | |
210 | } | |
211 | kfree(areas[i]); | |
212 | goto fail_malloc_areas2; | |
66a464db MH |
213 | } |
214 | } | |
215 | } | |
216 | return areas; | |
217 | ||
218 | fail_malloc_areas2: | |
219 | for(i--; i >= 0; i--){ | |
220 | for(j=0; j < pages_per_area;j++){ | |
221 | kfree(areas[i][j]); | |
222 | } | |
223 | kfree(areas[i]); | |
224 | } | |
225 | kfree(areas); | |
226 | fail_malloc_areas: | |
227 | return NULL; | |
228 | ||
229 | } | |
230 | ||
231 | ||
1da177e4 LT |
232 | /* |
233 | * debug_info_alloc | |
234 | * - alloc new debug-info | |
235 | */ | |
236 | ||
66a464db MH |
237 | static debug_info_t* |
238 | debug_info_alloc(char *name, int pages_per_area, int nr_areas, int buf_size, | |
239 | int level, int mode) | |
1da177e4 LT |
240 | { |
241 | debug_info_t* rc; | |
1da177e4 LT |
242 | |
243 | /* alloc everything */ | |
244 | ||
5cbded58 | 245 | rc = kmalloc(sizeof(debug_info_t), GFP_KERNEL); |
1da177e4 LT |
246 | if(!rc) |
247 | goto fail_malloc_rc; | |
fb630517 | 248 | rc->active_entries = kcalloc(nr_areas, sizeof(int), GFP_KERNEL); |
66a464db MH |
249 | if(!rc->active_entries) |
250 | goto fail_malloc_active_entries; | |
fb630517 | 251 | rc->active_pages = kcalloc(nr_areas, sizeof(int), GFP_KERNEL); |
66a464db MH |
252 | if(!rc->active_pages) |
253 | goto fail_malloc_active_pages; | |
66a464db MH |
254 | if((mode == ALL_AREAS) && (pages_per_area != 0)){ |
255 | rc->areas = debug_areas_alloc(pages_per_area, nr_areas); | |
256 | if(!rc->areas) | |
257 | goto fail_malloc_areas; | |
258 | } else { | |
259 | rc->areas = NULL; | |
1da177e4 LT |
260 | } |
261 | ||
262 | /* initialize members */ | |
263 | ||
264 | spin_lock_init(&rc->lock); | |
66a464db MH |
265 | rc->pages_per_area = pages_per_area; |
266 | rc->nr_areas = nr_areas; | |
267 | rc->active_area = 0; | |
268 | rc->level = level; | |
269 | rc->buf_size = buf_size; | |
270 | rc->entry_size = sizeof(debug_entry_t) + buf_size; | |
271 | strlcpy(rc->name, name, sizeof(rc->name)-1); | |
1da177e4 | 272 | memset(rc->views, 0, DEBUG_MAX_VIEWS * sizeof(struct debug_view *)); |
66a464db MH |
273 | memset(rc->debugfs_entries, 0 ,DEBUG_MAX_VIEWS * |
274 | sizeof(struct dentry*)); | |
1da177e4 LT |
275 | atomic_set(&(rc->ref_count), 0); |
276 | ||
277 | return rc; | |
278 | ||
1da177e4 | 279 | fail_malloc_areas: |
66a464db MH |
280 | kfree(rc->active_pages); |
281 | fail_malloc_active_pages: | |
282 | kfree(rc->active_entries); | |
283 | fail_malloc_active_entries: | |
1da177e4 LT |
284 | kfree(rc); |
285 | fail_malloc_rc: | |
286 | return NULL; | |
287 | } | |
288 | ||
289 | /* | |
66a464db MH |
290 | * debug_areas_free |
291 | * - free all debug areas | |
1da177e4 LT |
292 | */ |
293 | ||
66a464db MH |
294 | static void |
295 | debug_areas_free(debug_info_t* db_info) | |
296 | { | |
297 | int i,j; | |
298 | ||
299 | if(!db_info->areas) | |
300 | return; | |
1da177e4 | 301 | for (i = 0; i < db_info->nr_areas; i++) { |
66a464db MH |
302 | for(j = 0; j < db_info->pages_per_area; j++) { |
303 | kfree(db_info->areas[i][j]); | |
304 | } | |
305 | kfree(db_info->areas[i]); | |
1da177e4 LT |
306 | } |
307 | kfree(db_info->areas); | |
66a464db MH |
308 | db_info->areas = NULL; |
309 | } | |
310 | ||
311 | /* | |
312 | * debug_info_free | |
313 | * - free memory debug-info | |
314 | */ | |
315 | ||
316 | static void | |
317 | debug_info_free(debug_info_t* db_info){ | |
318 | debug_areas_free(db_info); | |
319 | kfree(db_info->active_entries); | |
320 | kfree(db_info->active_pages); | |
1da177e4 LT |
321 | kfree(db_info); |
322 | } | |
323 | ||
324 | /* | |
325 | * debug_info_create | |
326 | * - create new debug-info | |
327 | */ | |
328 | ||
66a464db MH |
329 | static debug_info_t* |
330 | debug_info_create(char *name, int pages_per_area, int nr_areas, int buf_size) | |
1da177e4 LT |
331 | { |
332 | debug_info_t* rc; | |
333 | ||
66a464db MH |
334 | rc = debug_info_alloc(name, pages_per_area, nr_areas, buf_size, |
335 | DEBUG_DEFAULT_LEVEL, ALL_AREAS); | |
1da177e4 LT |
336 | if(!rc) |
337 | goto out; | |
338 | ||
66a464db MH |
339 | /* create root directory */ |
340 | rc->debugfs_root_entry = debugfs_create_dir(rc->name, | |
341 | debug_debugfs_root_entry); | |
1da177e4 LT |
342 | |
343 | /* append new element to linked list */ | |
66a464db | 344 | if (!debug_area_first) { |
1da177e4 LT |
345 | /* first element in list */ |
346 | debug_area_first = rc; | |
347 | rc->prev = NULL; | |
348 | } else { | |
349 | /* append element to end of list */ | |
350 | debug_area_last->next = rc; | |
351 | rc->prev = debug_area_last; | |
352 | } | |
353 | debug_area_last = rc; | |
354 | rc->next = NULL; | |
355 | ||
356 | debug_info_get(rc); | |
357 | out: | |
358 | return rc; | |
359 | } | |
360 | ||
361 | /* | |
362 | * debug_info_copy | |
363 | * - copy debug-info | |
364 | */ | |
365 | ||
66a464db MH |
366 | static debug_info_t* |
367 | debug_info_copy(debug_info_t* in, int mode) | |
1da177e4 | 368 | { |
66a464db | 369 | int i,j; |
1da177e4 | 370 | debug_info_t* rc; |
942eaabd MH |
371 | unsigned long flags; |
372 | ||
373 | /* get a consistent copy of the debug areas */ | |
374 | do { | |
375 | rc = debug_info_alloc(in->name, in->pages_per_area, | |
376 | in->nr_areas, in->buf_size, in->level, mode); | |
377 | spin_lock_irqsave(&in->lock, flags); | |
378 | if(!rc) | |
379 | goto out; | |
380 | /* has something changed in the meantime ? */ | |
381 | if((rc->pages_per_area == in->pages_per_area) && | |
382 | (rc->nr_areas == in->nr_areas)) { | |
383 | break; | |
384 | } | |
385 | spin_unlock_irqrestore(&in->lock, flags); | |
386 | debug_info_free(rc); | |
387 | } while (1); | |
66a464db | 388 | |
66a464db | 389 | if(!rc || (mode == NO_AREAS)) |
1da177e4 LT |
390 | goto out; |
391 | ||
392 | for(i = 0; i < in->nr_areas; i++){ | |
66a464db MH |
393 | for(j = 0; j < in->pages_per_area; j++) { |
394 | memcpy(rc->areas[i][j], in->areas[i][j],PAGE_SIZE); | |
395 | } | |
1da177e4 LT |
396 | } |
397 | out: | |
942eaabd | 398 | spin_unlock_irqrestore(&in->lock, flags); |
1da177e4 LT |
399 | return rc; |
400 | } | |
401 | ||
402 | /* | |
403 | * debug_info_get | |
404 | * - increments reference count for debug-info | |
405 | */ | |
406 | ||
66a464db MH |
407 | static void |
408 | debug_info_get(debug_info_t * db_info) | |
1da177e4 LT |
409 | { |
410 | if (db_info) | |
411 | atomic_inc(&db_info->ref_count); | |
412 | } | |
413 | ||
414 | /* | |
415 | * debug_info_put: | |
416 | * - decreases reference count for debug-info and frees it if necessary | |
417 | */ | |
418 | ||
66a464db MH |
419 | static void |
420 | debug_info_put(debug_info_t *db_info) | |
1da177e4 LT |
421 | { |
422 | int i; | |
423 | ||
424 | if (!db_info) | |
425 | return; | |
426 | if (atomic_dec_and_test(&db_info->ref_count)) { | |
1da177e4 | 427 | for (i = 0; i < DEBUG_MAX_VIEWS; i++) { |
66a464db | 428 | if (!db_info->views[i]) |
1da177e4 | 429 | continue; |
66a464db | 430 | debugfs_remove(db_info->debugfs_entries[i]); |
1da177e4 | 431 | } |
66a464db | 432 | debugfs_remove(db_info->debugfs_root_entry); |
1da177e4 LT |
433 | if(db_info == debug_area_first) |
434 | debug_area_first = db_info->next; | |
435 | if(db_info == debug_area_last) | |
436 | debug_area_last = db_info->prev; | |
437 | if(db_info->prev) db_info->prev->next = db_info->next; | |
438 | if(db_info->next) db_info->next->prev = db_info->prev; | |
439 | debug_info_free(db_info); | |
440 | } | |
441 | } | |
442 | ||
443 | /* | |
444 | * debug_format_entry: | |
445 | * - format one debug entry and return size of formated data | |
446 | */ | |
447 | ||
66a464db MH |
448 | static int |
449 | debug_format_entry(file_private_info_t *p_info) | |
1da177e4 | 450 | { |
1da177e4 LT |
451 | debug_info_t *id_snap = p_info->debug_info_snap; |
452 | struct debug_view *view = p_info->view; | |
453 | debug_entry_t *act_entry; | |
454 | size_t len = 0; | |
455 | if(p_info->act_entry == DEBUG_PROLOG_ENTRY){ | |
456 | /* print prolog */ | |
457 | if (view->prolog_proc) | |
66a464db | 458 | len += view->prolog_proc(id_snap,view,p_info->temp_buf); |
1da177e4 LT |
459 | goto out; |
460 | } | |
66a464db MH |
461 | if (!id_snap->areas) /* this is true, if we have a prolog only view */ |
462 | goto out; /* or if 'pages_per_area' is 0 */ | |
463 | act_entry = (debug_entry_t *) ((char*)id_snap->areas[p_info->act_area] | |
464 | [p_info->act_page] + p_info->act_entry); | |
1da177e4 LT |
465 | |
466 | if (act_entry->id.stck == 0LL) | |
467 | goto out; /* empty entry */ | |
468 | if (view->header_proc) | |
66a464db | 469 | len += view->header_proc(id_snap, view, p_info->act_area, |
1da177e4 LT |
470 | act_entry, p_info->temp_buf + len); |
471 | if (view->format_proc) | |
66a464db | 472 | len += view->format_proc(id_snap, view, p_info->temp_buf + len, |
1da177e4 | 473 | DEBUG_DATA(act_entry)); |
66a464db | 474 | out: |
1da177e4 LT |
475 | return len; |
476 | } | |
477 | ||
478 | /* | |
479 | * debug_next_entry: | |
480 | * - goto next entry in p_info | |
481 | */ | |
482 | ||
4448aaf0 | 483 | static inline int |
66a464db | 484 | debug_next_entry(file_private_info_t *p_info) |
1da177e4 | 485 | { |
66a464db MH |
486 | debug_info_t *id; |
487 | ||
488 | id = p_info->debug_info_snap; | |
1da177e4 LT |
489 | if(p_info->act_entry == DEBUG_PROLOG_ENTRY){ |
490 | p_info->act_entry = 0; | |
66a464db | 491 | p_info->act_page = 0; |
1da177e4 LT |
492 | goto out; |
493 | } | |
66a464db MH |
494 | if(!id->areas) |
495 | return 1; | |
496 | p_info->act_entry += id->entry_size; | |
497 | /* switch to next page, if we reached the end of the page */ | |
498 | if (p_info->act_entry > (PAGE_SIZE - id->entry_size)){ | |
499 | /* next page */ | |
1da177e4 | 500 | p_info->act_entry = 0; |
66a464db MH |
501 | p_info->act_page += 1; |
502 | if((p_info->act_page % id->pages_per_area) == 0) { | |
503 | /* next area */ | |
504 | p_info->act_area++; | |
505 | p_info->act_page=0; | |
506 | } | |
1da177e4 LT |
507 | if(p_info->act_area >= id->nr_areas) |
508 | return 1; | |
509 | } | |
510 | out: | |
511 | return 0; | |
512 | } | |
513 | ||
514 | /* | |
515 | * debug_output: | |
516 | * - called for user read() | |
517 | * - copies formated debug entries to the user buffer | |
518 | */ | |
519 | ||
66a464db MH |
520 | static ssize_t |
521 | debug_output(struct file *file, /* file descriptor */ | |
522 | char __user *user_buf, /* user buffer */ | |
523 | size_t len, /* length of buffer */ | |
524 | loff_t *offset) /* offset in the file */ | |
1da177e4 LT |
525 | { |
526 | size_t count = 0; | |
66a464db | 527 | size_t entry_offset; |
1da177e4 LT |
528 | file_private_info_t *p_info; |
529 | ||
530 | p_info = ((file_private_info_t *) file->private_data); | |
531 | if (*offset != p_info->offset) | |
532 | return -EPIPE; | |
533 | if(p_info->act_area >= p_info->debug_info_snap->nr_areas) | |
534 | return 0; | |
1da177e4 | 535 | entry_offset = p_info->act_entry_offset; |
1da177e4 | 536 | while(count < len){ |
66a464db MH |
537 | int formatted_line_size; |
538 | int formatted_line_residue; | |
539 | int user_buf_residue; | |
540 | size_t copy_size; | |
541 | ||
542 | formatted_line_size = debug_format_entry(p_info); | |
543 | formatted_line_residue = formatted_line_size - entry_offset; | |
544 | user_buf_residue = len-count; | |
545 | copy_size = min(user_buf_residue, formatted_line_residue); | |
546 | if(copy_size){ | |
547 | if (copy_to_user(user_buf + count, p_info->temp_buf | |
548 | + entry_offset, copy_size)) | |
549 | return -EFAULT; | |
550 | count += copy_size; | |
551 | entry_offset += copy_size; | |
1da177e4 | 552 | } |
66a464db MH |
553 | if(copy_size == formatted_line_residue){ |
554 | entry_offset = 0; | |
555 | if(debug_next_entry(p_info)) | |
1da177e4 | 556 | goto out; |
66a464db | 557 | } |
1da177e4 LT |
558 | } |
559 | out: | |
560 | p_info->offset = *offset + count; | |
66a464db | 561 | p_info->act_entry_offset = entry_offset; |
1da177e4 LT |
562 | *offset = p_info->offset; |
563 | return count; | |
564 | } | |
565 | ||
566 | /* | |
567 | * debug_input: | |
568 | * - called for user write() | |
569 | * - calls input function of view | |
570 | */ | |
571 | ||
66a464db MH |
572 | static ssize_t |
573 | debug_input(struct file *file, const char __user *user_buf, size_t length, | |
574 | loff_t *offset) | |
1da177e4 LT |
575 | { |
576 | int rc = 0; | |
577 | file_private_info_t *p_info; | |
578 | ||
579 | down(&debug_lock); | |
580 | p_info = ((file_private_info_t *) file->private_data); | |
581 | if (p_info->view->input_proc) | |
582 | rc = p_info->view->input_proc(p_info->debug_info_org, | |
583 | p_info->view, file, user_buf, | |
584 | length, offset); | |
585 | else | |
586 | rc = -EPERM; | |
587 | up(&debug_lock); | |
588 | return rc; /* number of input characters */ | |
589 | } | |
590 | ||
591 | /* | |
592 | * debug_open: | |
593 | * - called for user open() | |
594 | * - copies formated output to private_data area of the file | |
595 | * handle | |
596 | */ | |
597 | ||
66a464db MH |
598 | static int |
599 | debug_open(struct inode *inode, struct file *file) | |
1da177e4 LT |
600 | { |
601 | int i = 0, rc = 0; | |
602 | file_private_info_t *p_info; | |
603 | debug_info_t *debug_info, *debug_info_snapshot; | |
604 | ||
1da177e4 | 605 | down(&debug_lock); |
d20343e7 | 606 | debug_info = file->f_path.dentry->d_inode->i_private; |
942eaabd MH |
607 | /* find debug view */ |
608 | for (i = 0; i < DEBUG_MAX_VIEWS; i++) { | |
609 | if (!debug_info->views[i]) | |
610 | continue; | |
611 | else if (debug_info->debugfs_entries[i] == | |
d20343e7 | 612 | file->f_path.dentry) { |
942eaabd | 613 | goto found; /* found view ! */ |
1da177e4 | 614 | } |
1da177e4 LT |
615 | } |
616 | /* no entry found */ | |
617 | rc = -EINVAL; | |
618 | goto out; | |
619 | ||
66a464db | 620 | found: |
1da177e4 | 621 | |
66a464db MH |
622 | /* Make snapshot of current debug areas to get it consistent. */ |
623 | /* To copy all the areas is only needed, if we have a view which */ | |
624 | /* formats the debug areas. */ | |
1da177e4 | 625 | |
66a464db MH |
626 | if(!debug_info->views[i]->format_proc && |
627 | !debug_info->views[i]->header_proc){ | |
628 | debug_info_snapshot = debug_info_copy(debug_info, NO_AREAS); | |
629 | } else { | |
630 | debug_info_snapshot = debug_info_copy(debug_info, ALL_AREAS); | |
631 | } | |
1da177e4 LT |
632 | |
633 | if(!debug_info_snapshot){ | |
1da177e4 LT |
634 | rc = -ENOMEM; |
635 | goto out; | |
636 | } | |
5cbded58 | 637 | p_info = kmalloc(sizeof(file_private_info_t), |
66a464db MH |
638 | GFP_KERNEL); |
639 | if(!p_info){ | |
640 | if(debug_info_snapshot) | |
641 | debug_info_free(debug_info_snapshot); | |
1da177e4 LT |
642 | rc = -ENOMEM; |
643 | goto out; | |
644 | } | |
1da177e4 LT |
645 | p_info->offset = 0; |
646 | p_info->debug_info_snap = debug_info_snapshot; | |
647 | p_info->debug_info_org = debug_info; | |
648 | p_info->view = debug_info->views[i]; | |
649 | p_info->act_area = 0; | |
66a464db | 650 | p_info->act_page = 0; |
1da177e4 LT |
651 | p_info->act_entry = DEBUG_PROLOG_ENTRY; |
652 | p_info->act_entry_offset = 0; | |
66a464db | 653 | file->private_data = p_info; |
1da177e4 | 654 | debug_info_get(debug_info); |
66a464db | 655 | out: |
1da177e4 LT |
656 | up(&debug_lock); |
657 | return rc; | |
658 | } | |
659 | ||
660 | /* | |
661 | * debug_close: | |
662 | * - called for user close() | |
663 | * - deletes private_data area of the file handle | |
664 | */ | |
665 | ||
66a464db MH |
666 | static int |
667 | debug_close(struct inode *inode, struct file *file) | |
1da177e4 LT |
668 | { |
669 | file_private_info_t *p_info; | |
1da177e4 | 670 | p_info = (file_private_info_t *) file->private_data; |
66a464db MH |
671 | if(p_info->debug_info_snap) |
672 | debug_info_free(p_info->debug_info_snap); | |
1da177e4 LT |
673 | debug_info_put(p_info->debug_info_org); |
674 | kfree(file->private_data); | |
675 | return 0; /* success */ | |
676 | } | |
677 | ||
678 | /* | |
679 | * debug_register: | |
680 | * - creates and initializes debug area for the caller | |
681 | * - returns handle for debug area | |
682 | */ | |
683 | ||
66a464db MH |
684 | debug_info_t* |
685 | debug_register (char *name, int pages_per_area, int nr_areas, int buf_size) | |
1da177e4 LT |
686 | { |
687 | debug_info_t *rc = NULL; | |
688 | ||
689 | if (!initialized) | |
690 | BUG(); | |
691 | down(&debug_lock); | |
692 | ||
693 | /* create new debug_info */ | |
694 | ||
66a464db | 695 | rc = debug_info_create(name, pages_per_area, nr_areas, buf_size); |
1da177e4 LT |
696 | if(!rc) |
697 | goto out; | |
698 | debug_register_view(rc, &debug_level_view); | |
699 | debug_register_view(rc, &debug_flush_view); | |
66a464db MH |
700 | debug_register_view(rc, &debug_pages_view); |
701 | out: | |
702 | if (!rc){ | |
1da177e4 LT |
703 | printk(KERN_ERR "debug: debug_register failed for %s\n",name); |
704 | } | |
705 | up(&debug_lock); | |
706 | return rc; | |
707 | } | |
708 | ||
709 | /* | |
710 | * debug_unregister: | |
711 | * - give back debug area | |
712 | */ | |
713 | ||
66a464db MH |
714 | void |
715 | debug_unregister(debug_info_t * id) | |
1da177e4 LT |
716 | { |
717 | if (!id) | |
718 | goto out; | |
719 | down(&debug_lock); | |
1da177e4 LT |
720 | debug_info_put(id); |
721 | up(&debug_lock); | |
722 | ||
66a464db | 723 | out: |
1da177e4 LT |
724 | return; |
725 | } | |
726 | ||
66a464db MH |
727 | /* |
728 | * debug_set_size: | |
729 | * - set area size (number of pages) and number of areas | |
730 | */ | |
731 | static int | |
732 | debug_set_size(debug_info_t* id, int nr_areas, int pages_per_area) | |
733 | { | |
734 | unsigned long flags; | |
735 | debug_entry_t *** new_areas; | |
736 | int rc=0; | |
737 | ||
738 | if(!id || (nr_areas <= 0) || (pages_per_area < 0)) | |
739 | return -EINVAL; | |
740 | if(pages_per_area > 0){ | |
741 | new_areas = debug_areas_alloc(pages_per_area, nr_areas); | |
742 | if(!new_areas) { | |
743 | printk(KERN_WARNING "debug: could not allocate memory "\ | |
744 | "for pagenumber: %i\n",pages_per_area); | |
745 | rc = -ENOMEM; | |
746 | goto out; | |
747 | } | |
748 | } else { | |
749 | new_areas = NULL; | |
750 | } | |
751 | spin_lock_irqsave(&id->lock,flags); | |
752 | debug_areas_free(id); | |
753 | id->areas = new_areas; | |
754 | id->nr_areas = nr_areas; | |
755 | id->pages_per_area = pages_per_area; | |
756 | id->active_area = 0; | |
757 | memset(id->active_entries,0,sizeof(int)*id->nr_areas); | |
758 | memset(id->active_pages, 0, sizeof(int)*id->nr_areas); | |
759 | spin_unlock_irqrestore(&id->lock,flags); | |
760 | printk(KERN_INFO "debug: %s: set new size (%i pages)\n"\ | |
761 | ,id->name, pages_per_area); | |
762 | out: | |
763 | return rc; | |
764 | } | |
765 | ||
1da177e4 LT |
766 | /* |
767 | * debug_set_level: | |
768 | * - set actual debug level | |
769 | */ | |
770 | ||
66a464db MH |
771 | void |
772 | debug_set_level(debug_info_t* id, int new_level) | |
1da177e4 LT |
773 | { |
774 | unsigned long flags; | |
775 | if(!id) | |
776 | return; | |
777 | spin_lock_irqsave(&id->lock,flags); | |
778 | if(new_level == DEBUG_OFF_LEVEL){ | |
779 | id->level = DEBUG_OFF_LEVEL; | |
780 | printk(KERN_INFO "debug: %s: switched off\n",id->name); | |
781 | } else if ((new_level > DEBUG_MAX_LEVEL) || (new_level < 0)) { | |
782 | printk(KERN_INFO | |
783 | "debug: %s: level %i is out of range (%i - %i)\n", | |
784 | id->name, new_level, 0, DEBUG_MAX_LEVEL); | |
785 | } else { | |
786 | id->level = new_level; | |
1da177e4 LT |
787 | } |
788 | spin_unlock_irqrestore(&id->lock,flags); | |
789 | } | |
790 | ||
791 | ||
792 | /* | |
793 | * proceed_active_entry: | |
794 | * - set active entry to next in the ring buffer | |
795 | */ | |
796 | ||
4448aaf0 | 797 | static inline void |
66a464db | 798 | proceed_active_entry(debug_info_t * id) |
1da177e4 | 799 | { |
66a464db MH |
800 | if ((id->active_entries[id->active_area] += id->entry_size) |
801 | > (PAGE_SIZE - id->entry_size)){ | |
802 | id->active_entries[id->active_area] = 0; | |
803 | id->active_pages[id->active_area] = | |
804 | (id->active_pages[id->active_area] + 1) % | |
805 | id->pages_per_area; | |
806 | } | |
1da177e4 LT |
807 | } |
808 | ||
809 | /* | |
810 | * proceed_active_area: | |
811 | * - set active area to next in the ring buffer | |
812 | */ | |
813 | ||
4448aaf0 | 814 | static inline void |
66a464db | 815 | proceed_active_area(debug_info_t * id) |
1da177e4 LT |
816 | { |
817 | id->active_area++; | |
818 | id->active_area = id->active_area % id->nr_areas; | |
819 | } | |
820 | ||
821 | /* | |
822 | * get_active_entry: | |
823 | */ | |
824 | ||
4448aaf0 | 825 | static inline debug_entry_t* |
66a464db | 826 | get_active_entry(debug_info_t * id) |
1da177e4 | 827 | { |
66a464db MH |
828 | return (debug_entry_t *) (((char *) id->areas[id->active_area] |
829 | [id->active_pages[id->active_area]]) + | |
830 | id->active_entries[id->active_area]); | |
1da177e4 LT |
831 | } |
832 | ||
833 | /* | |
834 | * debug_finish_entry: | |
835 | * - set timestamp, caller address, cpu number etc. | |
836 | */ | |
837 | ||
4448aaf0 | 838 | static inline void |
66a464db MH |
839 | debug_finish_entry(debug_info_t * id, debug_entry_t* active, int level, |
840 | int exception) | |
1da177e4 | 841 | { |
942eaabd | 842 | active->id.stck = get_clock(); |
1da177e4 LT |
843 | active->id.fields.cpuid = smp_processor_id(); |
844 | active->caller = __builtin_return_address(0); | |
845 | active->id.fields.exception = exception; | |
846 | active->id.fields.level = level; | |
847 | proceed_active_entry(id); | |
848 | if(exception) | |
849 | proceed_active_area(id); | |
850 | } | |
851 | ||
852 | static int debug_stoppable=1; | |
853 | static int debug_active=1; | |
854 | ||
1da177e4 LT |
855 | #define CTL_S390DBF_STOPPABLE 5678 |
856 | #define CTL_S390DBF_ACTIVE 5679 | |
857 | ||
858 | /* | |
859 | * proc handler for the running debug_active sysctl | |
860 | * always allow read, allow write only if debug_stoppable is set or | |
861 | * if debug_active is already off | |
862 | */ | |
66a464db MH |
863 | static int |
864 | s390dbf_procactive(ctl_table *table, int write, struct file *filp, | |
1da177e4 LT |
865 | void __user *buffer, size_t *lenp, loff_t *ppos) |
866 | { | |
867 | if (!write || debug_stoppable || !debug_active) | |
868 | return proc_dointvec(table, write, filp, buffer, lenp, ppos); | |
869 | else | |
870 | return 0; | |
871 | } | |
872 | ||
873 | ||
874 | static struct ctl_table s390dbf_table[] = { | |
875 | { | |
876 | .ctl_name = CTL_S390DBF_STOPPABLE, | |
877 | .procname = "debug_stoppable", | |
878 | .data = &debug_stoppable, | |
879 | .maxlen = sizeof(int), | |
880 | .mode = S_IRUGO | S_IWUSR, | |
881 | .proc_handler = &proc_dointvec, | |
882 | .strategy = &sysctl_intvec, | |
883 | }, | |
884 | { | |
885 | .ctl_name = CTL_S390DBF_ACTIVE, | |
886 | .procname = "debug_active", | |
887 | .data = &debug_active, | |
888 | .maxlen = sizeof(int), | |
889 | .mode = S_IRUGO | S_IWUSR, | |
890 | .proc_handler = &s390dbf_procactive, | |
891 | .strategy = &sysctl_intvec, | |
892 | }, | |
893 | { .ctl_name = 0 } | |
894 | }; | |
895 | ||
896 | static struct ctl_table s390dbf_dir_table[] = { | |
897 | { | |
898 | .ctl_name = CTL_S390DBF, | |
899 | .procname = "s390dbf", | |
900 | .maxlen = 0, | |
901 | .mode = S_IRUGO | S_IXUGO, | |
902 | .child = s390dbf_table, | |
903 | }, | |
904 | { .ctl_name = 0 } | |
905 | }; | |
906 | ||
2b67fc46 | 907 | static struct ctl_table_header *s390dbf_sysctl_header; |
1da177e4 | 908 | |
66a464db MH |
909 | void |
910 | debug_stop_all(void) | |
1da177e4 LT |
911 | { |
912 | if (debug_stoppable) | |
913 | debug_active = 0; | |
914 | } | |
915 | ||
916 | ||
917 | /* | |
918 | * debug_event_common: | |
919 | * - write debug entry with given size | |
920 | */ | |
921 | ||
66a464db MH |
922 | debug_entry_t* |
923 | debug_event_common(debug_info_t * id, int level, const void *buf, int len) | |
1da177e4 LT |
924 | { |
925 | unsigned long flags; | |
926 | debug_entry_t *active; | |
927 | ||
66a464db | 928 | if (!debug_active || !id->areas) |
1da177e4 LT |
929 | return NULL; |
930 | spin_lock_irqsave(&id->lock, flags); | |
931 | active = get_active_entry(id); | |
932 | memset(DEBUG_DATA(active), 0, id->buf_size); | |
933 | memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size)); | |
934 | debug_finish_entry(id, active, level, 0); | |
935 | spin_unlock_irqrestore(&id->lock, flags); | |
936 | ||
937 | return active; | |
938 | } | |
939 | ||
940 | /* | |
941 | * debug_exception_common: | |
942 | * - write debug entry with given size and switch to next debug area | |
943 | */ | |
944 | ||
66a464db MH |
945 | debug_entry_t |
946 | *debug_exception_common(debug_info_t * id, int level, const void *buf, int len) | |
1da177e4 LT |
947 | { |
948 | unsigned long flags; | |
949 | debug_entry_t *active; | |
950 | ||
66a464db | 951 | if (!debug_active || !id->areas) |
1da177e4 LT |
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, 1); | |
958 | spin_unlock_irqrestore(&id->lock, flags); | |
959 | ||
960 | return active; | |
961 | } | |
962 | ||
963 | /* | |
964 | * counts arguments in format string for sprintf view | |
965 | */ | |
966 | ||
4448aaf0 | 967 | static inline int |
66a464db | 968 | debug_count_numargs(char *string) |
1da177e4 LT |
969 | { |
970 | int numargs=0; | |
971 | ||
972 | while(*string) { | |
973 | if(*string++=='%') | |
974 | numargs++; | |
975 | } | |
976 | return(numargs); | |
977 | } | |
978 | ||
979 | /* | |
980 | * debug_sprintf_event: | |
981 | */ | |
982 | ||
66a464db MH |
983 | debug_entry_t* |
984 | debug_sprintf_event(debug_info_t* id, int level,char *string,...) | |
1da177e4 LT |
985 | { |
986 | va_list ap; | |
987 | int numargs,idx; | |
988 | unsigned long flags; | |
989 | debug_sprintf_entry_t *curr_event; | |
990 | debug_entry_t *active; | |
991 | ||
992 | if((!id) || (level > id->level)) | |
993 | return NULL; | |
66a464db | 994 | if (!debug_active || !id->areas) |
1da177e4 LT |
995 | return NULL; |
996 | numargs=debug_count_numargs(string); | |
997 | ||
998 | spin_lock_irqsave(&id->lock, flags); | |
999 | active = get_active_entry(id); | |
1000 | curr_event=(debug_sprintf_entry_t *) DEBUG_DATA(active); | |
1001 | va_start(ap,string); | |
1002 | curr_event->string=string; | |
1003 | for(idx=0;idx<min(numargs,(int)(id->buf_size / sizeof(long))-1);idx++) | |
1004 | curr_event->args[idx]=va_arg(ap,long); | |
1005 | va_end(ap); | |
1006 | debug_finish_entry(id, active, level, 0); | |
1007 | spin_unlock_irqrestore(&id->lock, flags); | |
1008 | ||
1009 | return active; | |
1010 | } | |
1011 | ||
1012 | /* | |
1013 | * debug_sprintf_exception: | |
1014 | */ | |
1015 | ||
66a464db MH |
1016 | debug_entry_t* |
1017 | debug_sprintf_exception(debug_info_t* id, int level,char *string,...) | |
1da177e4 LT |
1018 | { |
1019 | va_list ap; | |
1020 | int numargs,idx; | |
1021 | unsigned long flags; | |
1022 | debug_sprintf_entry_t *curr_event; | |
1023 | debug_entry_t *active; | |
1024 | ||
1025 | if((!id) || (level > id->level)) | |
1026 | return NULL; | |
66a464db | 1027 | if (!debug_active || !id->areas) |
1da177e4 LT |
1028 | return NULL; |
1029 | ||
1030 | numargs=debug_count_numargs(string); | |
1031 | ||
1032 | spin_lock_irqsave(&id->lock, flags); | |
1033 | active = get_active_entry(id); | |
1034 | curr_event=(debug_sprintf_entry_t *)DEBUG_DATA(active); | |
1035 | va_start(ap,string); | |
1036 | curr_event->string=string; | |
1037 | for(idx=0;idx<min(numargs,(int)(id->buf_size / sizeof(long))-1);idx++) | |
1038 | curr_event->args[idx]=va_arg(ap,long); | |
1039 | va_end(ap); | |
1040 | debug_finish_entry(id, active, level, 1); | |
1041 | spin_unlock_irqrestore(&id->lock, flags); | |
1042 | ||
1043 | return active; | |
1044 | } | |
1045 | ||
1046 | /* | |
1047 | * debug_init: | |
1048 | * - is called exactly once to initialize the debug feature | |
1049 | */ | |
1050 | ||
66a464db MH |
1051 | static int |
1052 | __init debug_init(void) | |
1da177e4 LT |
1053 | { |
1054 | int rc = 0; | |
1055 | ||
0b4d4147 | 1056 | s390dbf_sysctl_header = register_sysctl_table(s390dbf_dir_table); |
1da177e4 | 1057 | down(&debug_lock); |
66a464db | 1058 | debug_debugfs_root_entry = debugfs_create_dir(DEBUG_DIR_ROOT,NULL); |
1da177e4 LT |
1059 | printk(KERN_INFO "debug: Initialization complete\n"); |
1060 | initialized = 1; | |
1061 | up(&debug_lock); | |
1062 | ||
1063 | return rc; | |
1064 | } | |
1065 | ||
1066 | /* | |
1067 | * debug_register_view: | |
1068 | */ | |
1069 | ||
66a464db MH |
1070 | int |
1071 | debug_register_view(debug_info_t * id, struct debug_view *view) | |
1da177e4 LT |
1072 | { |
1073 | int rc = 0; | |
1074 | int i; | |
1075 | unsigned long flags; | |
1076 | mode_t mode = S_IFREG; | |
66a464db | 1077 | struct dentry *pde; |
1da177e4 LT |
1078 | |
1079 | if (!id) | |
1080 | goto out; | |
1081 | if (view->prolog_proc || view->format_proc || view->header_proc) | |
1082 | mode |= S_IRUSR; | |
1083 | if (view->input_proc) | |
1084 | mode |= S_IWUSR; | |
66a464db | 1085 | pde = debugfs_create_file(view->name, mode, id->debugfs_root_entry, |
942eaabd | 1086 | id , &debug_file_ops); |
1da177e4 | 1087 | if (!pde){ |
66a464db MH |
1088 | printk(KERN_WARNING "debug: debugfs_create_file() failed!"\ |
1089 | " Cannot register view %s/%s\n", id->name,view->name); | |
1da177e4 LT |
1090 | rc = -1; |
1091 | goto out; | |
1092 | } | |
1da177e4 LT |
1093 | spin_lock_irqsave(&id->lock, flags); |
1094 | for (i = 0; i < DEBUG_MAX_VIEWS; i++) { | |
66a464db | 1095 | if (!id->views[i]) |
1da177e4 LT |
1096 | break; |
1097 | } | |
1098 | if (i == DEBUG_MAX_VIEWS) { | |
1099 | printk(KERN_WARNING "debug: cannot register view %s/%s\n", | |
1100 | id->name,view->name); | |
1101 | printk(KERN_WARNING | |
1102 | "debug: maximum number of views reached (%i)!\n", i); | |
66a464db | 1103 | debugfs_remove(pde); |
1da177e4 | 1104 | rc = -1; |
66a464db | 1105 | } else { |
1da177e4 | 1106 | id->views[i] = view; |
66a464db | 1107 | id->debugfs_entries[i] = pde; |
1da177e4 LT |
1108 | } |
1109 | spin_unlock_irqrestore(&id->lock, flags); | |
66a464db | 1110 | out: |
1da177e4 LT |
1111 | return rc; |
1112 | } | |
1113 | ||
1114 | /* | |
1115 | * debug_unregister_view: | |
1116 | */ | |
1117 | ||
66a464db MH |
1118 | int |
1119 | debug_unregister_view(debug_info_t * id, struct debug_view *view) | |
1da177e4 LT |
1120 | { |
1121 | int rc = 0; | |
1122 | int i; | |
1123 | unsigned long flags; | |
1124 | ||
1125 | if (!id) | |
1126 | goto out; | |
1127 | spin_lock_irqsave(&id->lock, flags); | |
1128 | for (i = 0; i < DEBUG_MAX_VIEWS; i++) { | |
1129 | if (id->views[i] == view) | |
1130 | break; | |
1131 | } | |
1132 | if (i == DEBUG_MAX_VIEWS) | |
1133 | rc = -1; | |
1134 | else { | |
66a464db | 1135 | debugfs_remove(id->debugfs_entries[i]); |
1da177e4 LT |
1136 | id->views[i] = NULL; |
1137 | rc = 0; | |
1138 | } | |
1139 | spin_unlock_irqrestore(&id->lock, flags); | |
66a464db MH |
1140 | out: |
1141 | return rc; | |
1142 | } | |
1143 | ||
1144 | static inline char * | |
1145 | debug_get_user_string(const char __user *user_buf, size_t user_len) | |
1146 | { | |
1147 | char* buffer; | |
1148 | ||
1149 | buffer = kmalloc(user_len + 1, GFP_KERNEL); | |
1150 | if (!buffer) | |
1151 | return ERR_PTR(-ENOMEM); | |
1152 | if (copy_from_user(buffer, user_buf, user_len) != 0) { | |
1153 | kfree(buffer); | |
1154 | return ERR_PTR(-EFAULT); | |
1155 | } | |
1156 | /* got the string, now strip linefeed. */ | |
1157 | if (buffer[user_len - 1] == '\n') | |
1158 | buffer[user_len - 1] = 0; | |
1159 | else | |
1160 | buffer[user_len] = 0; | |
1161 | return buffer; | |
1162 | } | |
1163 | ||
1164 | static inline int | |
1165 | debug_get_uint(char *buf) | |
1166 | { | |
1167 | int rc; | |
1168 | ||
1169 | for(; isspace(*buf); buf++); | |
1170 | rc = simple_strtoul(buf, &buf, 10); | |
1171 | if(*buf){ | |
1172 | printk("debug: no integer specified!\n"); | |
1173 | rc = -EINVAL; | |
1174 | } | |
1da177e4 LT |
1175 | return rc; |
1176 | } | |
1177 | ||
1178 | /* | |
1179 | * functions for debug-views | |
1180 | *********************************** | |
1181 | */ | |
1182 | ||
1183 | /* | |
1184 | * prints out actual debug level | |
1185 | */ | |
1186 | ||
66a464db MH |
1187 | static int |
1188 | debug_prolog_pages_fn(debug_info_t * id, | |
1da177e4 | 1189 | struct debug_view *view, char *out_buf) |
66a464db MH |
1190 | { |
1191 | return sprintf(out_buf, "%i\n", id->pages_per_area); | |
1192 | } | |
1193 | ||
1194 | /* | |
1195 | * reads new size (number of pages per debug area) | |
1196 | */ | |
1197 | ||
1198 | static int | |
1199 | debug_input_pages_fn(debug_info_t * id, struct debug_view *view, | |
1200 | struct file *file, const char __user *user_buf, | |
1201 | size_t user_len, loff_t * offset) | |
1202 | { | |
1203 | char *str; | |
1204 | int rc,new_pages; | |
1205 | ||
1206 | if (user_len > 0x10000) | |
1207 | user_len = 0x10000; | |
1208 | if (*offset != 0){ | |
1209 | rc = -EPIPE; | |
1210 | goto out; | |
1211 | } | |
1212 | str = debug_get_user_string(user_buf,user_len); | |
1213 | if(IS_ERR(str)){ | |
1214 | rc = PTR_ERR(str); | |
1215 | goto out; | |
1216 | } | |
1217 | new_pages = debug_get_uint(str); | |
1218 | if(new_pages < 0){ | |
1219 | rc = -EINVAL; | |
1220 | goto free_str; | |
1221 | } | |
1222 | rc = debug_set_size(id,id->nr_areas, new_pages); | |
1223 | if(rc != 0){ | |
1224 | rc = -EINVAL; | |
1225 | goto free_str; | |
1226 | } | |
1227 | rc = user_len; | |
1228 | free_str: | |
1229 | kfree(str); | |
1230 | out: | |
1231 | *offset += user_len; | |
1232 | return rc; /* number of input characters */ | |
1233 | } | |
1234 | ||
1235 | /* | |
1236 | * prints out actual debug level | |
1237 | */ | |
1238 | ||
1239 | static int | |
1240 | debug_prolog_level_fn(debug_info_t * id, struct debug_view *view, char *out_buf) | |
1da177e4 LT |
1241 | { |
1242 | int rc = 0; | |
1243 | ||
66a464db MH |
1244 | if(id->level == DEBUG_OFF_LEVEL) { |
1245 | rc = sprintf(out_buf,"-\n"); | |
1246 | } | |
1247 | else { | |
1248 | rc = sprintf(out_buf, "%i\n", id->level); | |
1249 | } | |
1da177e4 LT |
1250 | return rc; |
1251 | } | |
1252 | ||
1253 | /* | |
1254 | * reads new debug level | |
1255 | */ | |
1256 | ||
66a464db MH |
1257 | static int |
1258 | debug_input_level_fn(debug_info_t * id, struct debug_view *view, | |
1259 | struct file *file, const char __user *user_buf, | |
1260 | size_t user_len, loff_t * offset) | |
1da177e4 | 1261 | { |
66a464db MH |
1262 | char *str; |
1263 | int rc,new_level; | |
1da177e4 | 1264 | |
66a464db MH |
1265 | if (user_len > 0x10000) |
1266 | user_len = 0x10000; | |
1267 | if (*offset != 0){ | |
1268 | rc = -EPIPE; | |
1da177e4 | 1269 | goto out; |
66a464db MH |
1270 | } |
1271 | str = debug_get_user_string(user_buf,user_len); | |
1272 | if(IS_ERR(str)){ | |
1273 | rc = PTR_ERR(str); | |
1da177e4 LT |
1274 | goto out; |
1275 | } | |
66a464db | 1276 | if(str[0] == '-'){ |
1da177e4 | 1277 | debug_set_level(id, DEBUG_OFF_LEVEL); |
66a464db MH |
1278 | rc = user_len; |
1279 | goto free_str; | |
1da177e4 | 1280 | } else { |
66a464db | 1281 | new_level = debug_get_uint(str); |
1da177e4 | 1282 | } |
66a464db MH |
1283 | if(new_level < 0) { |
1284 | printk(KERN_INFO "debug: level `%s` is not valid\n", str); | |
1285 | rc = -EINVAL; | |
1286 | } else { | |
1287 | debug_set_level(id, new_level); | |
1288 | rc = user_len; | |
1289 | } | |
1290 | free_str: | |
1291 | kfree(str); | |
1292 | out: | |
1293 | *offset += user_len; | |
1da177e4 LT |
1294 | return rc; /* number of input characters */ |
1295 | } | |
1296 | ||
1297 | ||
1298 | /* | |
1299 | * flushes debug areas | |
1300 | */ | |
1301 | ||
2b67fc46 | 1302 | static void debug_flush(debug_info_t* id, int area) |
1da177e4 LT |
1303 | { |
1304 | unsigned long flags; | |
66a464db | 1305 | int i,j; |
1da177e4 | 1306 | |
66a464db | 1307 | if(!id || !id->areas) |
1da177e4 LT |
1308 | return; |
1309 | spin_lock_irqsave(&id->lock,flags); | |
1310 | if(area == DEBUG_FLUSH_ALL){ | |
1311 | id->active_area = 0; | |
66a464db MH |
1312 | memset(id->active_entries, 0, id->nr_areas * sizeof(int)); |
1313 | for (i = 0; i < id->nr_areas; i++) { | |
1314 | id->active_pages[i] = 0; | |
1315 | for(j = 0; j < id->pages_per_area; j++) { | |
1316 | memset(id->areas[i][j], 0, PAGE_SIZE); | |
1317 | } | |
1318 | } | |
1da177e4 LT |
1319 | printk(KERN_INFO "debug: %s: all areas flushed\n",id->name); |
1320 | } else if(area >= 0 && area < id->nr_areas) { | |
66a464db MH |
1321 | id->active_entries[area] = 0; |
1322 | id->active_pages[area] = 0; | |
1323 | for(i = 0; i < id->pages_per_area; i++) { | |
1324 | memset(id->areas[area][i],0,PAGE_SIZE); | |
1325 | } | |
1326 | printk(KERN_INFO "debug: %s: area %i has been flushed\n", | |
1da177e4 LT |
1327 | id->name, area); |
1328 | } else { | |
1329 | printk(KERN_INFO | |
66a464db | 1330 | "debug: %s: area %i cannot be flushed (range: %i - %i)\n", |
1da177e4 LT |
1331 | id->name, area, 0, id->nr_areas-1); |
1332 | } | |
1333 | spin_unlock_irqrestore(&id->lock,flags); | |
1334 | } | |
1335 | ||
1336 | /* | |
1337 | * view function: flushes debug areas | |
1338 | */ | |
1339 | ||
66a464db MH |
1340 | static int |
1341 | debug_input_flush_fn(debug_info_t * id, struct debug_view *view, | |
1342 | struct file *file, const char __user *user_buf, | |
1343 | size_t user_len, loff_t * offset) | |
1da177e4 LT |
1344 | { |
1345 | char input_buf[1]; | |
66a464db MH |
1346 | int rc = user_len; |
1347 | ||
1348 | if (user_len > 0x10000) | |
1349 | user_len = 0x10000; | |
1350 | if (*offset != 0){ | |
1351 | rc = -EPIPE; | |
1da177e4 | 1352 | goto out; |
66a464db | 1353 | } |
1da177e4 LT |
1354 | if (copy_from_user(input_buf, user_buf, 1)){ |
1355 | rc = -EFAULT; | |
1356 | goto out; | |
1357 | } | |
1358 | if(input_buf[0] == '-') { | |
1359 | debug_flush(id, DEBUG_FLUSH_ALL); | |
1360 | goto out; | |
1361 | } | |
1362 | if (isdigit(input_buf[0])) { | |
1363 | int area = ((int) input_buf[0] - (int) '0'); | |
1364 | debug_flush(id, area); | |
1365 | goto out; | |
1366 | } | |
1367 | ||
1368 | printk(KERN_INFO "debug: area `%c` is not valid\n", input_buf[0]); | |
1369 | ||
66a464db MH |
1370 | out: |
1371 | *offset += user_len; | |
1da177e4 LT |
1372 | return rc; /* number of input characters */ |
1373 | } | |
1374 | ||
1375 | /* | |
1376 | * prints debug header in raw format | |
1377 | */ | |
1378 | ||
66a464db MH |
1379 | static int |
1380 | debug_raw_header_fn(debug_info_t * id, struct debug_view *view, | |
1381 | int area, debug_entry_t * entry, char *out_buf) | |
1da177e4 LT |
1382 | { |
1383 | int rc; | |
1384 | ||
1385 | rc = sizeof(debug_entry_t); | |
1386 | memcpy(out_buf,entry,sizeof(debug_entry_t)); | |
1387 | return rc; | |
1388 | } | |
1389 | ||
1390 | /* | |
1391 | * prints debug data in raw format | |
1392 | */ | |
1393 | ||
66a464db MH |
1394 | static int |
1395 | debug_raw_format_fn(debug_info_t * id, struct debug_view *view, | |
1da177e4 LT |
1396 | char *out_buf, const char *in_buf) |
1397 | { | |
1398 | int rc; | |
1399 | ||
1400 | rc = id->buf_size; | |
1401 | memcpy(out_buf, in_buf, id->buf_size); | |
1402 | return rc; | |
1403 | } | |
1404 | ||
1405 | /* | |
1406 | * prints debug data in hex/ascii format | |
1407 | */ | |
1408 | ||
66a464db MH |
1409 | static int |
1410 | debug_hex_ascii_format_fn(debug_info_t * id, struct debug_view *view, | |
1411 | char *out_buf, const char *in_buf) | |
1da177e4 LT |
1412 | { |
1413 | int i, rc = 0; | |
1414 | ||
1415 | for (i = 0; i < id->buf_size; i++) { | |
1416 | rc += sprintf(out_buf + rc, "%02x ", | |
1417 | ((unsigned char *) in_buf)[i]); | |
1418 | } | |
1419 | rc += sprintf(out_buf + rc, "| "); | |
1420 | for (i = 0; i < id->buf_size; i++) { | |
1421 | unsigned char c = in_buf[i]; | |
1422 | if (!isprint(c)) | |
1423 | rc += sprintf(out_buf + rc, "."); | |
1424 | else | |
1425 | rc += sprintf(out_buf + rc, "%c", c); | |
1426 | } | |
1427 | rc += sprintf(out_buf + rc, "\n"); | |
1428 | return rc; | |
1429 | } | |
1430 | ||
1431 | /* | |
1432 | * prints header for debug entry | |
1433 | */ | |
1434 | ||
66a464db MH |
1435 | int |
1436 | debug_dflt_header_fn(debug_info_t * id, struct debug_view *view, | |
1da177e4 LT |
1437 | int area, debug_entry_t * entry, char *out_buf) |
1438 | { | |
942eaabd | 1439 | struct timespec time_spec; |
1da177e4 LT |
1440 | unsigned long long time; |
1441 | char *except_str; | |
1442 | unsigned long caller; | |
1443 | int rc = 0; | |
1444 | unsigned int level; | |
1445 | ||
1446 | level = entry->id.fields.level; | |
1447 | time = entry->id.stck; | |
1448 | /* adjust todclock to 1970 */ | |
1449 | time -= 0x8126d60e46000000LL - (0x3c26700LL * 1000000 * 4096); | |
942eaabd | 1450 | tod_to_timeval(time, &time_spec); |
1da177e4 LT |
1451 | |
1452 | if (entry->id.fields.exception) | |
1453 | except_str = "*"; | |
1454 | else | |
1455 | except_str = "-"; | |
1456 | caller = ((unsigned long) entry->caller) & PSW_ADDR_INSN; | |
1457 | rc += sprintf(out_buf, "%02i %011lu:%06lu %1u %1s %02i %p ", | |
942eaabd | 1458 | area, time_spec.tv_sec, time_spec.tv_nsec / 1000, level, |
1da177e4 LT |
1459 | except_str, entry->id.fields.cpuid, (void *) caller); |
1460 | return rc; | |
1461 | } | |
1462 | ||
1463 | /* | |
1464 | * prints debug data sprintf-formated: | |
1465 | * debug_sprinf_event/exception calls must be used together with this view | |
1466 | */ | |
1467 | ||
1468 | #define DEBUG_SPRINTF_MAX_ARGS 10 | |
1469 | ||
66a464db MH |
1470 | static int |
1471 | debug_sprintf_format_fn(debug_info_t * id, struct debug_view *view, | |
1472 | char *out_buf, debug_sprintf_entry_t *curr_event) | |
1da177e4 LT |
1473 | { |
1474 | int num_longs, num_used_args = 0,i, rc = 0; | |
1475 | int index[DEBUG_SPRINTF_MAX_ARGS]; | |
1476 | ||
1477 | /* count of longs fit into one entry */ | |
1478 | num_longs = id->buf_size / sizeof(long); | |
1479 | ||
1480 | if(num_longs < 1) | |
1481 | goto out; /* bufsize of entry too small */ | |
1482 | if(num_longs == 1) { | |
1483 | /* no args, we use only the string */ | |
1484 | strcpy(out_buf, curr_event->string); | |
1485 | rc = strlen(curr_event->string); | |
1486 | goto out; | |
1487 | } | |
1488 | ||
1489 | /* number of arguments used for sprintf (without the format string) */ | |
1490 | num_used_args = min(DEBUG_SPRINTF_MAX_ARGS, (num_longs - 1)); | |
1491 | ||
1492 | memset(index,0, DEBUG_SPRINTF_MAX_ARGS * sizeof(int)); | |
1493 | ||
1494 | for(i = 0; i < num_used_args; i++) | |
1495 | index[i] = i; | |
1496 | ||
1497 | rc = sprintf(out_buf, curr_event->string, curr_event->args[index[0]], | |
1498 | curr_event->args[index[1]], curr_event->args[index[2]], | |
1499 | curr_event->args[index[3]], curr_event->args[index[4]], | |
1500 | curr_event->args[index[5]], curr_event->args[index[6]], | |
1501 | curr_event->args[index[7]], curr_event->args[index[8]], | |
1502 | curr_event->args[index[9]]); | |
1503 | ||
1504 | out: | |
1505 | ||
1506 | return rc; | |
1507 | } | |
1508 | ||
1509 | /* | |
1510 | * clean up module | |
1511 | */ | |
2b67fc46 | 1512 | static void __exit debug_exit(void) |
1da177e4 | 1513 | { |
66a464db | 1514 | debugfs_remove(debug_debugfs_root_entry); |
1da177e4 LT |
1515 | unregister_sysctl_table(s390dbf_sysctl_header); |
1516 | return; | |
1517 | } | |
1518 | ||
1519 | /* | |
1520 | * module definitions | |
1521 | */ | |
66a464db | 1522 | postcore_initcall(debug_init); |
1da177e4 LT |
1523 | module_exit(debug_exit); |
1524 | MODULE_LICENSE("GPL"); | |
1525 | ||
1526 | EXPORT_SYMBOL(debug_register); | |
1527 | EXPORT_SYMBOL(debug_unregister); | |
1528 | EXPORT_SYMBOL(debug_set_level); | |
1529 | EXPORT_SYMBOL(debug_stop_all); | |
1530 | EXPORT_SYMBOL(debug_register_view); | |
1531 | EXPORT_SYMBOL(debug_unregister_view); | |
1532 | EXPORT_SYMBOL(debug_event_common); | |
1533 | EXPORT_SYMBOL(debug_exception_common); | |
1534 | EXPORT_SYMBOL(debug_hex_ascii_view); | |
1535 | EXPORT_SYMBOL(debug_raw_view); | |
1536 | EXPORT_SYMBOL(debug_dflt_header_fn); | |
1537 | EXPORT_SYMBOL(debug_sprintf_view); | |
1538 | EXPORT_SYMBOL(debug_sprintf_exception); | |
1539 | EXPORT_SYMBOL(debug_sprintf_event); |