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> | |
1da177e4 LT |
20 | #include <linux/module.h> |
21 | #include <linux/init.h> | |
66a464db MH |
22 | #include <linux/fs.h> |
23 | #include <linux/debugfs.h> | |
1da177e4 LT |
24 | |
25 | #include <asm/debug.h> | |
26 | ||
27 | #define DEBUG_PROLOG_ENTRY -1 | |
28 | ||
66a464db MH |
29 | #define ALL_AREAS 0 /* copy all debug areas */ |
30 | #define NO_AREAS 1 /* copy no debug areas */ | |
31 | ||
1da177e4 LT |
32 | /* typedefs */ |
33 | ||
34 | typedef struct file_private_info { | |
35 | loff_t offset; /* offset of last read in file */ | |
36 | int act_area; /* number of last formated area */ | |
66a464db | 37 | int act_page; /* act page in given area */ |
1da177e4 LT |
38 | int act_entry; /* last formated entry (offset */ |
39 | /* relative to beginning of last */ | |
66a464db | 40 | /* formated page) */ |
1da177e4 LT |
41 | size_t act_entry_offset; /* up to this offset we copied */ |
42 | /* in last read the last formated */ | |
43 | /* entry to userland */ | |
44 | char temp_buf[2048]; /* buffer for output */ | |
45 | debug_info_t *debug_info_org; /* original debug information */ | |
46 | debug_info_t *debug_info_snap; /* snapshot of debug information */ | |
47 | struct debug_view *view; /* used view of debug info */ | |
48 | } file_private_info_t; | |
49 | ||
50 | typedef struct | |
51 | { | |
52 | char *string; | |
53 | /* | |
54 | * This assumes that all args are converted into longs | |
55 | * on L/390 this is the case for all types of parameter | |
56 | * except of floats, and long long (32 bit) | |
66a464db MH |
57 | * |
58 | */ | |
1da177e4 LT |
59 | long args[0]; |
60 | } debug_sprintf_entry_t; | |
61 | ||
62 | ||
942eaabd | 63 | extern void tod_to_timeval(uint64_t todval, struct timespec *xtime); |
1da177e4 LT |
64 | |
65 | /* internal function prototyes */ | |
66 | ||
67 | static int debug_init(void); | |
68 | static ssize_t debug_output(struct file *file, char __user *user_buf, | |
66a464db | 69 | size_t user_len, loff_t * offset); |
1da177e4 | 70 | static ssize_t debug_input(struct file *file, const char __user *user_buf, |
66a464db | 71 | size_t user_len, loff_t * offset); |
1da177e4 LT |
72 | static int debug_open(struct inode *inode, struct file *file); |
73 | static int debug_close(struct inode *inode, struct file *file); | |
5cbbf16a | 74 | static debug_info_t *debug_info_create(const char *name, int pages_per_area, |
9637c3f3 | 75 | int nr_areas, int buf_size, mode_t mode); |
1da177e4 LT |
76 | static void debug_info_get(debug_info_t *); |
77 | static void debug_info_put(debug_info_t *); | |
78 | static int debug_prolog_level_fn(debug_info_t * id, | |
66a464db | 79 | struct debug_view *view, char *out_buf); |
1da177e4 | 80 | static int debug_input_level_fn(debug_info_t * id, struct debug_view *view, |
66a464db MH |
81 | struct file *file, const char __user *user_buf, |
82 | size_t user_buf_size, loff_t * offset); | |
83 | static int debug_prolog_pages_fn(debug_info_t * id, | |
84 | struct debug_view *view, char *out_buf); | |
85 | static int debug_input_pages_fn(debug_info_t * id, struct debug_view *view, | |
86 | struct file *file, const char __user *user_buf, | |
87 | size_t user_buf_size, loff_t * offset); | |
1da177e4 | 88 | static int debug_input_flush_fn(debug_info_t * id, struct debug_view *view, |
66a464db MH |
89 | struct file *file, const char __user *user_buf, |
90 | size_t user_buf_size, loff_t * offset); | |
1da177e4 | 91 | static int debug_hex_ascii_format_fn(debug_info_t * id, struct debug_view *view, |
66a464db | 92 | char *out_buf, const char *in_buf); |
1da177e4 | 93 | static int debug_raw_format_fn(debug_info_t * id, |
66a464db MH |
94 | struct debug_view *view, char *out_buf, |
95 | const char *in_buf); | |
1da177e4 | 96 | static int debug_raw_header_fn(debug_info_t * id, struct debug_view *view, |
66a464db | 97 | int area, debug_entry_t * entry, char *out_buf); |
1da177e4 LT |
98 | |
99 | static int debug_sprintf_format_fn(debug_info_t * id, struct debug_view *view, | |
66a464db | 100 | char *out_buf, debug_sprintf_entry_t *curr_event); |
1da177e4 LT |
101 | |
102 | /* globals */ | |
103 | ||
104 | struct debug_view debug_raw_view = { | |
105 | "raw", | |
106 | NULL, | |
107 | &debug_raw_header_fn, | |
108 | &debug_raw_format_fn, | |
109 | NULL, | |
110 | NULL | |
111 | }; | |
112 | ||
113 | struct debug_view debug_hex_ascii_view = { | |
114 | "hex_ascii", | |
115 | NULL, | |
116 | &debug_dflt_header_fn, | |
117 | &debug_hex_ascii_format_fn, | |
118 | NULL, | |
119 | NULL | |
120 | }; | |
121 | ||
2b67fc46 | 122 | static struct debug_view debug_level_view = { |
1da177e4 LT |
123 | "level", |
124 | &debug_prolog_level_fn, | |
125 | NULL, | |
126 | NULL, | |
127 | &debug_input_level_fn, | |
128 | NULL | |
129 | }; | |
130 | ||
2b67fc46 | 131 | static struct debug_view debug_pages_view = { |
66a464db MH |
132 | "pages", |
133 | &debug_prolog_pages_fn, | |
134 | NULL, | |
135 | NULL, | |
136 | &debug_input_pages_fn, | |
137 | NULL | |
138 | }; | |
139 | ||
2b67fc46 | 140 | static struct debug_view debug_flush_view = { |
1da177e4 LT |
141 | "flush", |
142 | NULL, | |
143 | NULL, | |
144 | NULL, | |
145 | &debug_input_flush_fn, | |
146 | NULL | |
147 | }; | |
148 | ||
149 | struct debug_view debug_sprintf_view = { | |
150 | "sprintf", | |
151 | NULL, | |
152 | &debug_dflt_header_fn, | |
153 | (debug_format_proc_t*)&debug_sprintf_format_fn, | |
154 | NULL, | |
155 | NULL | |
156 | }; | |
157 | ||
2b67fc46 | 158 | /* used by dump analysis tools to determine version of debug feature */ |
a806170e | 159 | static unsigned int __used debug_feature_version = __DEBUG_FEATURE_VERSION; |
1da177e4 LT |
160 | |
161 | /* static globals */ | |
162 | ||
163 | static debug_info_t *debug_area_first = NULL; | |
164 | static debug_info_t *debug_area_last = NULL; | |
e11f0d04 | 165 | static DEFINE_MUTEX(debug_mutex); |
1da177e4 LT |
166 | |
167 | static int initialized; | |
168 | ||
5dfe4c96 | 169 | static const struct file_operations debug_file_ops = { |
66a464db | 170 | .owner = THIS_MODULE, |
1da177e4 | 171 | .read = debug_output, |
66a464db | 172 | .write = debug_input, |
1da177e4 LT |
173 | .open = debug_open, |
174 | .release = debug_close, | |
175 | }; | |
176 | ||
66a464db | 177 | static struct dentry *debug_debugfs_root_entry; |
1da177e4 LT |
178 | |
179 | /* functions */ | |
180 | ||
66a464db MH |
181 | /* |
182 | * debug_areas_alloc | |
183 | * - Debug areas are implemented as a threedimensonal array: | |
184 | * areas[areanumber][pagenumber][pageoffset] | |
185 | */ | |
186 | ||
187 | static debug_entry_t*** | |
188 | debug_areas_alloc(int pages_per_area, int nr_areas) | |
189 | { | |
190 | debug_entry_t*** areas; | |
191 | int i,j; | |
192 | ||
5cbded58 | 193 | areas = kmalloc(nr_areas * |
66a464db MH |
194 | sizeof(debug_entry_t**), |
195 | GFP_KERNEL); | |
196 | if (!areas) | |
197 | goto fail_malloc_areas; | |
198 | for (i = 0; i < nr_areas; i++) { | |
5cbded58 | 199 | areas[i] = kmalloc(pages_per_area * |
66a464db MH |
200 | sizeof(debug_entry_t*),GFP_KERNEL); |
201 | if (!areas[i]) { | |
202 | goto fail_malloc_areas2; | |
203 | } | |
204 | for(j = 0; j < pages_per_area; j++) { | |
fb630517 | 205 | areas[i][j] = kzalloc(PAGE_SIZE, GFP_KERNEL); |
66a464db MH |
206 | if(!areas[i][j]) { |
207 | for(j--; j >=0 ; j--) { | |
208 | kfree(areas[i][j]); | |
209 | } | |
210 | kfree(areas[i]); | |
211 | goto fail_malloc_areas2; | |
66a464db MH |
212 | } |
213 | } | |
214 | } | |
215 | return areas; | |
216 | ||
217 | fail_malloc_areas2: | |
218 | for(i--; i >= 0; i--){ | |
219 | for(j=0; j < pages_per_area;j++){ | |
220 | kfree(areas[i][j]); | |
221 | } | |
222 | kfree(areas[i]); | |
223 | } | |
224 | kfree(areas); | |
225 | fail_malloc_areas: | |
226 | return NULL; | |
227 | ||
228 | } | |
229 | ||
230 | ||
1da177e4 LT |
231 | /* |
232 | * debug_info_alloc | |
233 | * - alloc new debug-info | |
234 | */ | |
235 | ||
66a464db | 236 | static debug_info_t* |
5cbbf16a CH |
237 | debug_info_alloc(const char *name, int pages_per_area, int nr_areas, |
238 | int buf_size, int level, int mode) | |
1da177e4 LT |
239 | { |
240 | debug_info_t* rc; | |
1da177e4 LT |
241 | |
242 | /* alloc everything */ | |
243 | ||
5cbded58 | 244 | rc = kmalloc(sizeof(debug_info_t), GFP_KERNEL); |
1da177e4 LT |
245 | if(!rc) |
246 | goto fail_malloc_rc; | |
fb630517 | 247 | rc->active_entries = kcalloc(nr_areas, sizeof(int), GFP_KERNEL); |
66a464db MH |
248 | if(!rc->active_entries) |
249 | goto fail_malloc_active_entries; | |
fb630517 | 250 | rc->active_pages = kcalloc(nr_areas, sizeof(int), GFP_KERNEL); |
66a464db MH |
251 | if(!rc->active_pages) |
252 | goto fail_malloc_active_pages; | |
66a464db MH |
253 | if((mode == ALL_AREAS) && (pages_per_area != 0)){ |
254 | rc->areas = debug_areas_alloc(pages_per_area, nr_areas); | |
255 | if(!rc->areas) | |
256 | goto fail_malloc_areas; | |
257 | } else { | |
258 | rc->areas = NULL; | |
1da177e4 LT |
259 | } |
260 | ||
261 | /* initialize members */ | |
262 | ||
263 | spin_lock_init(&rc->lock); | |
66a464db MH |
264 | rc->pages_per_area = pages_per_area; |
265 | rc->nr_areas = nr_areas; | |
266 | rc->active_area = 0; | |
267 | rc->level = level; | |
268 | rc->buf_size = buf_size; | |
269 | rc->entry_size = sizeof(debug_entry_t) + buf_size; | |
20cb9e79 | 270 | strlcpy(rc->name, name, sizeof(rc->name)); |
1da177e4 | 271 | memset(rc->views, 0, DEBUG_MAX_VIEWS * sizeof(struct debug_view *)); |
66a464db MH |
272 | memset(rc->debugfs_entries, 0 ,DEBUG_MAX_VIEWS * |
273 | sizeof(struct dentry*)); | |
1da177e4 LT |
274 | atomic_set(&(rc->ref_count), 0); |
275 | ||
276 | return rc; | |
277 | ||
1da177e4 | 278 | fail_malloc_areas: |
66a464db MH |
279 | kfree(rc->active_pages); |
280 | fail_malloc_active_pages: | |
281 | kfree(rc->active_entries); | |
282 | fail_malloc_active_entries: | |
1da177e4 LT |
283 | kfree(rc); |
284 | fail_malloc_rc: | |
285 | return NULL; | |
286 | } | |
287 | ||
288 | /* | |
66a464db MH |
289 | * debug_areas_free |
290 | * - free all debug areas | |
1da177e4 LT |
291 | */ |
292 | ||
66a464db MH |
293 | static void |
294 | debug_areas_free(debug_info_t* db_info) | |
295 | { | |
296 | int i,j; | |
297 | ||
298 | if(!db_info->areas) | |
299 | return; | |
1da177e4 | 300 | for (i = 0; i < db_info->nr_areas; i++) { |
66a464db MH |
301 | for(j = 0; j < db_info->pages_per_area; j++) { |
302 | kfree(db_info->areas[i][j]); | |
303 | } | |
304 | kfree(db_info->areas[i]); | |
1da177e4 LT |
305 | } |
306 | kfree(db_info->areas); | |
66a464db MH |
307 | db_info->areas = NULL; |
308 | } | |
309 | ||
310 | /* | |
311 | * debug_info_free | |
312 | * - free memory debug-info | |
313 | */ | |
314 | ||
315 | static void | |
316 | debug_info_free(debug_info_t* db_info){ | |
317 | debug_areas_free(db_info); | |
318 | kfree(db_info->active_entries); | |
319 | kfree(db_info->active_pages); | |
1da177e4 LT |
320 | kfree(db_info); |
321 | } | |
322 | ||
323 | /* | |
324 | * debug_info_create | |
325 | * - create new debug-info | |
326 | */ | |
327 | ||
66a464db | 328 | static debug_info_t* |
5cbbf16a CH |
329 | debug_info_create(const char *name, int pages_per_area, int nr_areas, |
330 | int buf_size, mode_t mode) | |
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 | ||
9637c3f3 MH |
339 | rc->mode = mode & ~S_IFMT; |
340 | ||
66a464db MH |
341 | /* create root directory */ |
342 | rc->debugfs_root_entry = debugfs_create_dir(rc->name, | |
343 | debug_debugfs_root_entry); | |
1da177e4 LT |
344 | |
345 | /* append new element to linked list */ | |
66a464db | 346 | if (!debug_area_first) { |
1da177e4 LT |
347 | /* first element in list */ |
348 | debug_area_first = rc; | |
349 | rc->prev = NULL; | |
350 | } else { | |
351 | /* append element to end of list */ | |
352 | debug_area_last->next = rc; | |
353 | rc->prev = debug_area_last; | |
354 | } | |
355 | debug_area_last = rc; | |
356 | rc->next = NULL; | |
357 | ||
358 | debug_info_get(rc); | |
359 | out: | |
360 | return rc; | |
361 | } | |
362 | ||
363 | /* | |
364 | * debug_info_copy | |
365 | * - copy debug-info | |
366 | */ | |
367 | ||
66a464db MH |
368 | static debug_info_t* |
369 | debug_info_copy(debug_info_t* in, int mode) | |
1da177e4 | 370 | { |
66a464db | 371 | int i,j; |
1da177e4 | 372 | debug_info_t* rc; |
942eaabd MH |
373 | unsigned long flags; |
374 | ||
375 | /* get a consistent copy of the debug areas */ | |
376 | do { | |
377 | rc = debug_info_alloc(in->name, in->pages_per_area, | |
378 | in->nr_areas, in->buf_size, in->level, mode); | |
379 | spin_lock_irqsave(&in->lock, flags); | |
380 | if(!rc) | |
381 | goto out; | |
382 | /* has something changed in the meantime ? */ | |
383 | if((rc->pages_per_area == in->pages_per_area) && | |
384 | (rc->nr_areas == in->nr_areas)) { | |
385 | break; | |
386 | } | |
387 | spin_unlock_irqrestore(&in->lock, flags); | |
388 | debug_info_free(rc); | |
389 | } while (1); | |
66a464db | 390 | |
acfa922c | 391 | if (mode == NO_AREAS) |
1da177e4 LT |
392 | goto out; |
393 | ||
394 | for(i = 0; i < in->nr_areas; i++){ | |
66a464db MH |
395 | for(j = 0; j < in->pages_per_area; j++) { |
396 | memcpy(rc->areas[i][j], in->areas[i][j],PAGE_SIZE); | |
397 | } | |
1da177e4 LT |
398 | } |
399 | out: | |
942eaabd | 400 | spin_unlock_irqrestore(&in->lock, flags); |
1da177e4 LT |
401 | return rc; |
402 | } | |
403 | ||
404 | /* | |
405 | * debug_info_get | |
406 | * - increments reference count for debug-info | |
407 | */ | |
408 | ||
66a464db MH |
409 | static void |
410 | debug_info_get(debug_info_t * db_info) | |
1da177e4 LT |
411 | { |
412 | if (db_info) | |
413 | atomic_inc(&db_info->ref_count); | |
414 | } | |
415 | ||
416 | /* | |
417 | * debug_info_put: | |
418 | * - decreases reference count for debug-info and frees it if necessary | |
419 | */ | |
420 | ||
66a464db MH |
421 | static void |
422 | debug_info_put(debug_info_t *db_info) | |
1da177e4 LT |
423 | { |
424 | int i; | |
425 | ||
426 | if (!db_info) | |
427 | return; | |
428 | if (atomic_dec_and_test(&db_info->ref_count)) { | |
1da177e4 | 429 | for (i = 0; i < DEBUG_MAX_VIEWS; i++) { |
66a464db | 430 | if (!db_info->views[i]) |
1da177e4 | 431 | continue; |
66a464db | 432 | debugfs_remove(db_info->debugfs_entries[i]); |
1da177e4 | 433 | } |
66a464db | 434 | debugfs_remove(db_info->debugfs_root_entry); |
1da177e4 LT |
435 | if(db_info == debug_area_first) |
436 | debug_area_first = db_info->next; | |
437 | if(db_info == debug_area_last) | |
438 | debug_area_last = db_info->prev; | |
439 | if(db_info->prev) db_info->prev->next = db_info->next; | |
440 | if(db_info->next) db_info->next->prev = db_info->prev; | |
441 | debug_info_free(db_info); | |
442 | } | |
443 | } | |
444 | ||
445 | /* | |
446 | * debug_format_entry: | |
447 | * - format one debug entry and return size of formated data | |
448 | */ | |
449 | ||
66a464db MH |
450 | static int |
451 | debug_format_entry(file_private_info_t *p_info) | |
1da177e4 | 452 | { |
1da177e4 LT |
453 | debug_info_t *id_snap = p_info->debug_info_snap; |
454 | struct debug_view *view = p_info->view; | |
455 | debug_entry_t *act_entry; | |
456 | size_t len = 0; | |
457 | if(p_info->act_entry == DEBUG_PROLOG_ENTRY){ | |
458 | /* print prolog */ | |
459 | if (view->prolog_proc) | |
66a464db | 460 | len += view->prolog_proc(id_snap,view,p_info->temp_buf); |
1da177e4 LT |
461 | goto out; |
462 | } | |
66a464db MH |
463 | if (!id_snap->areas) /* this is true, if we have a prolog only view */ |
464 | goto out; /* or if 'pages_per_area' is 0 */ | |
465 | act_entry = (debug_entry_t *) ((char*)id_snap->areas[p_info->act_area] | |
466 | [p_info->act_page] + p_info->act_entry); | |
1da177e4 LT |
467 | |
468 | if (act_entry->id.stck == 0LL) | |
469 | goto out; /* empty entry */ | |
470 | if (view->header_proc) | |
66a464db | 471 | len += view->header_proc(id_snap, view, p_info->act_area, |
1da177e4 LT |
472 | act_entry, p_info->temp_buf + len); |
473 | if (view->format_proc) | |
66a464db | 474 | len += view->format_proc(id_snap, view, p_info->temp_buf + len, |
1da177e4 | 475 | DEBUG_DATA(act_entry)); |
66a464db | 476 | out: |
1da177e4 LT |
477 | return len; |
478 | } | |
479 | ||
480 | /* | |
481 | * debug_next_entry: | |
482 | * - goto next entry in p_info | |
483 | */ | |
484 | ||
4448aaf0 | 485 | static inline int |
66a464db | 486 | debug_next_entry(file_private_info_t *p_info) |
1da177e4 | 487 | { |
66a464db MH |
488 | debug_info_t *id; |
489 | ||
490 | id = p_info->debug_info_snap; | |
1da177e4 LT |
491 | if(p_info->act_entry == DEBUG_PROLOG_ENTRY){ |
492 | p_info->act_entry = 0; | |
66a464db | 493 | p_info->act_page = 0; |
1da177e4 LT |
494 | goto out; |
495 | } | |
66a464db MH |
496 | if(!id->areas) |
497 | return 1; | |
498 | p_info->act_entry += id->entry_size; | |
499 | /* switch to next page, if we reached the end of the page */ | |
500 | if (p_info->act_entry > (PAGE_SIZE - id->entry_size)){ | |
501 | /* next page */ | |
1da177e4 | 502 | p_info->act_entry = 0; |
66a464db MH |
503 | p_info->act_page += 1; |
504 | if((p_info->act_page % id->pages_per_area) == 0) { | |
505 | /* next area */ | |
506 | p_info->act_area++; | |
507 | p_info->act_page=0; | |
508 | } | |
1da177e4 LT |
509 | if(p_info->act_area >= id->nr_areas) |
510 | return 1; | |
511 | } | |
512 | out: | |
513 | return 0; | |
514 | } | |
515 | ||
516 | /* | |
517 | * debug_output: | |
518 | * - called for user read() | |
519 | * - copies formated debug entries to the user buffer | |
520 | */ | |
521 | ||
66a464db MH |
522 | static ssize_t |
523 | debug_output(struct file *file, /* file descriptor */ | |
524 | char __user *user_buf, /* user buffer */ | |
525 | size_t len, /* length of buffer */ | |
526 | loff_t *offset) /* offset in the file */ | |
1da177e4 LT |
527 | { |
528 | size_t count = 0; | |
66a464db | 529 | size_t entry_offset; |
1da177e4 LT |
530 | file_private_info_t *p_info; |
531 | ||
532 | p_info = ((file_private_info_t *) file->private_data); | |
533 | if (*offset != p_info->offset) | |
534 | return -EPIPE; | |
535 | if(p_info->act_area >= p_info->debug_info_snap->nr_areas) | |
536 | return 0; | |
1da177e4 | 537 | entry_offset = p_info->act_entry_offset; |
1da177e4 | 538 | while(count < len){ |
66a464db MH |
539 | int formatted_line_size; |
540 | int formatted_line_residue; | |
541 | int user_buf_residue; | |
542 | size_t copy_size; | |
543 | ||
544 | formatted_line_size = debug_format_entry(p_info); | |
545 | formatted_line_residue = formatted_line_size - entry_offset; | |
546 | user_buf_residue = len-count; | |
547 | copy_size = min(user_buf_residue, formatted_line_residue); | |
548 | if(copy_size){ | |
549 | if (copy_to_user(user_buf + count, p_info->temp_buf | |
550 | + entry_offset, copy_size)) | |
551 | return -EFAULT; | |
552 | count += copy_size; | |
553 | entry_offset += copy_size; | |
1da177e4 | 554 | } |
66a464db MH |
555 | if(copy_size == formatted_line_residue){ |
556 | entry_offset = 0; | |
557 | if(debug_next_entry(p_info)) | |
1da177e4 | 558 | goto out; |
66a464db | 559 | } |
1da177e4 LT |
560 | } |
561 | out: | |
562 | p_info->offset = *offset + count; | |
66a464db | 563 | p_info->act_entry_offset = entry_offset; |
1da177e4 LT |
564 | *offset = p_info->offset; |
565 | return count; | |
566 | } | |
567 | ||
568 | /* | |
569 | * debug_input: | |
570 | * - called for user write() | |
571 | * - calls input function of view | |
572 | */ | |
573 | ||
66a464db MH |
574 | static ssize_t |
575 | debug_input(struct file *file, const char __user *user_buf, size_t length, | |
576 | loff_t *offset) | |
1da177e4 LT |
577 | { |
578 | int rc = 0; | |
579 | file_private_info_t *p_info; | |
580 | ||
e11f0d04 | 581 | mutex_lock(&debug_mutex); |
1da177e4 LT |
582 | p_info = ((file_private_info_t *) file->private_data); |
583 | if (p_info->view->input_proc) | |
584 | rc = p_info->view->input_proc(p_info->debug_info_org, | |
585 | p_info->view, file, user_buf, | |
586 | length, offset); | |
587 | else | |
588 | rc = -EPERM; | |
e11f0d04 | 589 | mutex_unlock(&debug_mutex); |
1da177e4 LT |
590 | return rc; /* number of input characters */ |
591 | } | |
592 | ||
593 | /* | |
594 | * debug_open: | |
595 | * - called for user open() | |
596 | * - copies formated output to private_data area of the file | |
597 | * handle | |
598 | */ | |
599 | ||
66a464db MH |
600 | static int |
601 | debug_open(struct inode *inode, struct file *file) | |
1da177e4 LT |
602 | { |
603 | int i = 0, rc = 0; | |
604 | file_private_info_t *p_info; | |
605 | debug_info_t *debug_info, *debug_info_snapshot; | |
606 | ||
e11f0d04 | 607 | mutex_lock(&debug_mutex); |
d20343e7 | 608 | debug_info = file->f_path.dentry->d_inode->i_private; |
942eaabd MH |
609 | /* find debug view */ |
610 | for (i = 0; i < DEBUG_MAX_VIEWS; i++) { | |
611 | if (!debug_info->views[i]) | |
612 | continue; | |
613 | else if (debug_info->debugfs_entries[i] == | |
d20343e7 | 614 | file->f_path.dentry) { |
942eaabd | 615 | goto found; /* found view ! */ |
1da177e4 | 616 | } |
1da177e4 LT |
617 | } |
618 | /* no entry found */ | |
619 | rc = -EINVAL; | |
620 | goto out; | |
621 | ||
66a464db | 622 | found: |
1da177e4 | 623 | |
66a464db MH |
624 | /* Make snapshot of current debug areas to get it consistent. */ |
625 | /* To copy all the areas is only needed, if we have a view which */ | |
626 | /* formats the debug areas. */ | |
1da177e4 | 627 | |
66a464db MH |
628 | if(!debug_info->views[i]->format_proc && |
629 | !debug_info->views[i]->header_proc){ | |
630 | debug_info_snapshot = debug_info_copy(debug_info, NO_AREAS); | |
631 | } else { | |
632 | debug_info_snapshot = debug_info_copy(debug_info, ALL_AREAS); | |
633 | } | |
1da177e4 LT |
634 | |
635 | if(!debug_info_snapshot){ | |
1da177e4 LT |
636 | rc = -ENOMEM; |
637 | goto out; | |
638 | } | |
5cbded58 | 639 | p_info = kmalloc(sizeof(file_private_info_t), |
66a464db MH |
640 | GFP_KERNEL); |
641 | if(!p_info){ | |
642 | if(debug_info_snapshot) | |
643 | debug_info_free(debug_info_snapshot); | |
1da177e4 LT |
644 | rc = -ENOMEM; |
645 | goto out; | |
646 | } | |
1da177e4 LT |
647 | p_info->offset = 0; |
648 | p_info->debug_info_snap = debug_info_snapshot; | |
649 | p_info->debug_info_org = debug_info; | |
650 | p_info->view = debug_info->views[i]; | |
651 | p_info->act_area = 0; | |
66a464db | 652 | p_info->act_page = 0; |
1da177e4 LT |
653 | p_info->act_entry = DEBUG_PROLOG_ENTRY; |
654 | p_info->act_entry_offset = 0; | |
66a464db | 655 | file->private_data = p_info; |
1da177e4 | 656 | debug_info_get(debug_info); |
66a464db | 657 | out: |
e11f0d04 | 658 | mutex_unlock(&debug_mutex); |
1da177e4 LT |
659 | return rc; |
660 | } | |
661 | ||
662 | /* | |
663 | * debug_close: | |
664 | * - called for user close() | |
665 | * - deletes private_data area of the file handle | |
666 | */ | |
667 | ||
66a464db MH |
668 | static int |
669 | debug_close(struct inode *inode, struct file *file) | |
1da177e4 LT |
670 | { |
671 | file_private_info_t *p_info; | |
1da177e4 | 672 | p_info = (file_private_info_t *) file->private_data; |
66a464db MH |
673 | if(p_info->debug_info_snap) |
674 | debug_info_free(p_info->debug_info_snap); | |
1da177e4 LT |
675 | debug_info_put(p_info->debug_info_org); |
676 | kfree(file->private_data); | |
677 | return 0; /* success */ | |
678 | } | |
679 | ||
680 | /* | |
9637c3f3 MH |
681 | * debug_register_mode: |
682 | * - Creates and initializes debug area for the caller | |
683 | * The mode parameter allows to specify access rights for the s390dbf files | |
684 | * - Returns handle for debug area | |
1da177e4 LT |
685 | */ |
686 | ||
5cbbf16a CH |
687 | debug_info_t *debug_register_mode(const char *name, int pages_per_area, |
688 | int nr_areas, int buf_size, mode_t mode, | |
689 | uid_t uid, gid_t gid) | |
1da177e4 LT |
690 | { |
691 | debug_info_t *rc = NULL; | |
692 | ||
9637c3f3 MH |
693 | /* Since debugfs currently does not support uid/gid other than root, */ |
694 | /* we do not allow gid/uid != 0 until we get support for that. */ | |
695 | if ((uid != 0) || (gid != 0)) | |
696 | printk(KERN_WARNING "debug: Warning - Currently only uid/gid " | |
697 | "= 0 are supported. Using root as owner now!"); | |
1da177e4 LT |
698 | if (!initialized) |
699 | BUG(); | |
e11f0d04 | 700 | mutex_lock(&debug_mutex); |
1da177e4 LT |
701 | |
702 | /* create new debug_info */ | |
703 | ||
9637c3f3 | 704 | rc = debug_info_create(name, pages_per_area, nr_areas, buf_size, mode); |
1da177e4 LT |
705 | if(!rc) |
706 | goto out; | |
707 | debug_register_view(rc, &debug_level_view); | |
708 | debug_register_view(rc, &debug_flush_view); | |
66a464db MH |
709 | debug_register_view(rc, &debug_pages_view); |
710 | out: | |
711 | if (!rc){ | |
1da177e4 LT |
712 | printk(KERN_ERR "debug: debug_register failed for %s\n",name); |
713 | } | |
e11f0d04 | 714 | mutex_unlock(&debug_mutex); |
1da177e4 LT |
715 | return rc; |
716 | } | |
9637c3f3 MH |
717 | EXPORT_SYMBOL(debug_register_mode); |
718 | ||
719 | /* | |
720 | * debug_register: | |
721 | * - creates and initializes debug area for the caller | |
722 | * - returns handle for debug area | |
723 | */ | |
724 | ||
5cbbf16a CH |
725 | debug_info_t *debug_register(const char *name, int pages_per_area, |
726 | int nr_areas, int buf_size) | |
9637c3f3 MH |
727 | { |
728 | return debug_register_mode(name, pages_per_area, nr_areas, buf_size, | |
729 | S_IRUSR | S_IWUSR, 0, 0); | |
730 | } | |
1da177e4 LT |
731 | |
732 | /* | |
733 | * debug_unregister: | |
734 | * - give back debug area | |
735 | */ | |
736 | ||
66a464db MH |
737 | void |
738 | debug_unregister(debug_info_t * id) | |
1da177e4 LT |
739 | { |
740 | if (!id) | |
741 | goto out; | |
e11f0d04 | 742 | mutex_lock(&debug_mutex); |
1da177e4 | 743 | debug_info_put(id); |
e11f0d04 | 744 | mutex_unlock(&debug_mutex); |
1da177e4 | 745 | |
66a464db | 746 | out: |
1da177e4 LT |
747 | return; |
748 | } | |
749 | ||
66a464db MH |
750 | /* |
751 | * debug_set_size: | |
752 | * - set area size (number of pages) and number of areas | |
753 | */ | |
754 | static int | |
755 | debug_set_size(debug_info_t* id, int nr_areas, int pages_per_area) | |
756 | { | |
757 | unsigned long flags; | |
758 | debug_entry_t *** new_areas; | |
759 | int rc=0; | |
760 | ||
761 | if(!id || (nr_areas <= 0) || (pages_per_area < 0)) | |
762 | return -EINVAL; | |
763 | if(pages_per_area > 0){ | |
764 | new_areas = debug_areas_alloc(pages_per_area, nr_areas); | |
765 | if(!new_areas) { | |
766 | printk(KERN_WARNING "debug: could not allocate memory "\ | |
767 | "for pagenumber: %i\n",pages_per_area); | |
768 | rc = -ENOMEM; | |
769 | goto out; | |
770 | } | |
771 | } else { | |
772 | new_areas = NULL; | |
773 | } | |
774 | spin_lock_irqsave(&id->lock,flags); | |
775 | debug_areas_free(id); | |
776 | id->areas = new_areas; | |
777 | id->nr_areas = nr_areas; | |
778 | id->pages_per_area = pages_per_area; | |
779 | id->active_area = 0; | |
780 | memset(id->active_entries,0,sizeof(int)*id->nr_areas); | |
781 | memset(id->active_pages, 0, sizeof(int)*id->nr_areas); | |
782 | spin_unlock_irqrestore(&id->lock,flags); | |
783 | printk(KERN_INFO "debug: %s: set new size (%i pages)\n"\ | |
784 | ,id->name, pages_per_area); | |
785 | out: | |
786 | return rc; | |
787 | } | |
788 | ||
1da177e4 LT |
789 | /* |
790 | * debug_set_level: | |
791 | * - set actual debug level | |
792 | */ | |
793 | ||
66a464db MH |
794 | void |
795 | debug_set_level(debug_info_t* id, int new_level) | |
1da177e4 LT |
796 | { |
797 | unsigned long flags; | |
798 | if(!id) | |
799 | return; | |
800 | spin_lock_irqsave(&id->lock,flags); | |
801 | if(new_level == DEBUG_OFF_LEVEL){ | |
802 | id->level = DEBUG_OFF_LEVEL; | |
803 | printk(KERN_INFO "debug: %s: switched off\n",id->name); | |
804 | } else if ((new_level > DEBUG_MAX_LEVEL) || (new_level < 0)) { | |
805 | printk(KERN_INFO | |
806 | "debug: %s: level %i is out of range (%i - %i)\n", | |
807 | id->name, new_level, 0, DEBUG_MAX_LEVEL); | |
808 | } else { | |
809 | id->level = new_level; | |
1da177e4 LT |
810 | } |
811 | spin_unlock_irqrestore(&id->lock,flags); | |
812 | } | |
813 | ||
814 | ||
815 | /* | |
816 | * proceed_active_entry: | |
817 | * - set active entry to next in the ring buffer | |
818 | */ | |
819 | ||
4448aaf0 | 820 | static inline void |
66a464db | 821 | proceed_active_entry(debug_info_t * id) |
1da177e4 | 822 | { |
66a464db MH |
823 | if ((id->active_entries[id->active_area] += id->entry_size) |
824 | > (PAGE_SIZE - id->entry_size)){ | |
825 | id->active_entries[id->active_area] = 0; | |
826 | id->active_pages[id->active_area] = | |
827 | (id->active_pages[id->active_area] + 1) % | |
828 | id->pages_per_area; | |
829 | } | |
1da177e4 LT |
830 | } |
831 | ||
832 | /* | |
833 | * proceed_active_area: | |
834 | * - set active area to next in the ring buffer | |
835 | */ | |
836 | ||
4448aaf0 | 837 | static inline void |
66a464db | 838 | proceed_active_area(debug_info_t * id) |
1da177e4 LT |
839 | { |
840 | id->active_area++; | |
841 | id->active_area = id->active_area % id->nr_areas; | |
842 | } | |
843 | ||
844 | /* | |
845 | * get_active_entry: | |
846 | */ | |
847 | ||
4448aaf0 | 848 | static inline debug_entry_t* |
66a464db | 849 | get_active_entry(debug_info_t * id) |
1da177e4 | 850 | { |
66a464db MH |
851 | return (debug_entry_t *) (((char *) id->areas[id->active_area] |
852 | [id->active_pages[id->active_area]]) + | |
853 | id->active_entries[id->active_area]); | |
1da177e4 LT |
854 | } |
855 | ||
856 | /* | |
857 | * debug_finish_entry: | |
858 | * - set timestamp, caller address, cpu number etc. | |
859 | */ | |
860 | ||
4448aaf0 | 861 | static inline void |
66a464db MH |
862 | debug_finish_entry(debug_info_t * id, debug_entry_t* active, int level, |
863 | int exception) | |
1da177e4 | 864 | { |
942eaabd | 865 | active->id.stck = get_clock(); |
1da177e4 LT |
866 | active->id.fields.cpuid = smp_processor_id(); |
867 | active->caller = __builtin_return_address(0); | |
868 | active->id.fields.exception = exception; | |
869 | active->id.fields.level = level; | |
870 | proceed_active_entry(id); | |
871 | if(exception) | |
872 | proceed_active_area(id); | |
873 | } | |
874 | ||
875 | static int debug_stoppable=1; | |
876 | static int debug_active=1; | |
877 | ||
1da177e4 LT |
878 | #define CTL_S390DBF_STOPPABLE 5678 |
879 | #define CTL_S390DBF_ACTIVE 5679 | |
880 | ||
881 | /* | |
882 | * proc handler for the running debug_active sysctl | |
883 | * always allow read, allow write only if debug_stoppable is set or | |
884 | * if debug_active is already off | |
885 | */ | |
66a464db MH |
886 | static int |
887 | s390dbf_procactive(ctl_table *table, int write, struct file *filp, | |
1da177e4 LT |
888 | void __user *buffer, size_t *lenp, loff_t *ppos) |
889 | { | |
890 | if (!write || debug_stoppable || !debug_active) | |
891 | return proc_dointvec(table, write, filp, buffer, lenp, ppos); | |
892 | else | |
893 | return 0; | |
894 | } | |
895 | ||
896 | ||
897 | static struct ctl_table s390dbf_table[] = { | |
898 | { | |
899 | .ctl_name = CTL_S390DBF_STOPPABLE, | |
900 | .procname = "debug_stoppable", | |
901 | .data = &debug_stoppable, | |
902 | .maxlen = sizeof(int), | |
903 | .mode = S_IRUGO | S_IWUSR, | |
904 | .proc_handler = &proc_dointvec, | |
905 | .strategy = &sysctl_intvec, | |
906 | }, | |
907 | { | |
908 | .ctl_name = CTL_S390DBF_ACTIVE, | |
909 | .procname = "debug_active", | |
910 | .data = &debug_active, | |
911 | .maxlen = sizeof(int), | |
912 | .mode = S_IRUGO | S_IWUSR, | |
913 | .proc_handler = &s390dbf_procactive, | |
914 | .strategy = &sysctl_intvec, | |
915 | }, | |
916 | { .ctl_name = 0 } | |
917 | }; | |
918 | ||
919 | static struct ctl_table s390dbf_dir_table[] = { | |
920 | { | |
921 | .ctl_name = CTL_S390DBF, | |
922 | .procname = "s390dbf", | |
923 | .maxlen = 0, | |
924 | .mode = S_IRUGO | S_IXUGO, | |
925 | .child = s390dbf_table, | |
926 | }, | |
927 | { .ctl_name = 0 } | |
928 | }; | |
929 | ||
2b67fc46 | 930 | static struct ctl_table_header *s390dbf_sysctl_header; |
1da177e4 | 931 | |
66a464db MH |
932 | void |
933 | debug_stop_all(void) | |
1da177e4 LT |
934 | { |
935 | if (debug_stoppable) | |
936 | debug_active = 0; | |
937 | } | |
938 | ||
939 | ||
940 | /* | |
941 | * debug_event_common: | |
942 | * - write debug entry with given size | |
943 | */ | |
944 | ||
66a464db MH |
945 | debug_entry_t* |
946 | debug_event_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, 0); | |
958 | spin_unlock_irqrestore(&id->lock, flags); | |
959 | ||
960 | return active; | |
961 | } | |
962 | ||
963 | /* | |
964 | * debug_exception_common: | |
965 | * - write debug entry with given size and switch to next debug area | |
966 | */ | |
967 | ||
66a464db MH |
968 | debug_entry_t |
969 | *debug_exception_common(debug_info_t * id, int level, const void *buf, int len) | |
1da177e4 LT |
970 | { |
971 | unsigned long flags; | |
972 | debug_entry_t *active; | |
973 | ||
66a464db | 974 | if (!debug_active || !id->areas) |
1da177e4 LT |
975 | return NULL; |
976 | spin_lock_irqsave(&id->lock, flags); | |
977 | active = get_active_entry(id); | |
978 | memset(DEBUG_DATA(active), 0, id->buf_size); | |
979 | memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size)); | |
980 | debug_finish_entry(id, active, level, 1); | |
981 | spin_unlock_irqrestore(&id->lock, flags); | |
982 | ||
983 | return active; | |
984 | } | |
985 | ||
986 | /* | |
987 | * counts arguments in format string for sprintf view | |
988 | */ | |
989 | ||
4448aaf0 | 990 | static inline int |
66a464db | 991 | debug_count_numargs(char *string) |
1da177e4 LT |
992 | { |
993 | int numargs=0; | |
994 | ||
995 | while(*string) { | |
996 | if(*string++=='%') | |
997 | numargs++; | |
998 | } | |
999 | return(numargs); | |
1000 | } | |
1001 | ||
1002 | /* | |
1003 | * debug_sprintf_event: | |
1004 | */ | |
1005 | ||
66a464db MH |
1006 | debug_entry_t* |
1007 | debug_sprintf_event(debug_info_t* id, int level,char *string,...) | |
1da177e4 LT |
1008 | { |
1009 | va_list ap; | |
1010 | int numargs,idx; | |
1011 | unsigned long flags; | |
1012 | debug_sprintf_entry_t *curr_event; | |
1013 | debug_entry_t *active; | |
1014 | ||
1015 | if((!id) || (level > id->level)) | |
1016 | return NULL; | |
66a464db | 1017 | if (!debug_active || !id->areas) |
1da177e4 LT |
1018 | return NULL; |
1019 | numargs=debug_count_numargs(string); | |
1020 | ||
1021 | spin_lock_irqsave(&id->lock, flags); | |
1022 | active = get_active_entry(id); | |
1023 | curr_event=(debug_sprintf_entry_t *) DEBUG_DATA(active); | |
1024 | va_start(ap,string); | |
1025 | curr_event->string=string; | |
1026 | for(idx=0;idx<min(numargs,(int)(id->buf_size / sizeof(long))-1);idx++) | |
1027 | curr_event->args[idx]=va_arg(ap,long); | |
1028 | va_end(ap); | |
1029 | debug_finish_entry(id, active, level, 0); | |
1030 | spin_unlock_irqrestore(&id->lock, flags); | |
1031 | ||
1032 | return active; | |
1033 | } | |
1034 | ||
1035 | /* | |
1036 | * debug_sprintf_exception: | |
1037 | */ | |
1038 | ||
66a464db MH |
1039 | debug_entry_t* |
1040 | debug_sprintf_exception(debug_info_t* id, int level,char *string,...) | |
1da177e4 LT |
1041 | { |
1042 | va_list ap; | |
1043 | int numargs,idx; | |
1044 | unsigned long flags; | |
1045 | debug_sprintf_entry_t *curr_event; | |
1046 | debug_entry_t *active; | |
1047 | ||
1048 | if((!id) || (level > id->level)) | |
1049 | return NULL; | |
66a464db | 1050 | if (!debug_active || !id->areas) |
1da177e4 LT |
1051 | return NULL; |
1052 | ||
1053 | numargs=debug_count_numargs(string); | |
1054 | ||
1055 | spin_lock_irqsave(&id->lock, flags); | |
1056 | active = get_active_entry(id); | |
1057 | curr_event=(debug_sprintf_entry_t *)DEBUG_DATA(active); | |
1058 | va_start(ap,string); | |
1059 | curr_event->string=string; | |
1060 | for(idx=0;idx<min(numargs,(int)(id->buf_size / sizeof(long))-1);idx++) | |
1061 | curr_event->args[idx]=va_arg(ap,long); | |
1062 | va_end(ap); | |
1063 | debug_finish_entry(id, active, level, 1); | |
1064 | spin_unlock_irqrestore(&id->lock, flags); | |
1065 | ||
1066 | return active; | |
1067 | } | |
1068 | ||
1069 | /* | |
1070 | * debug_init: | |
1071 | * - is called exactly once to initialize the debug feature | |
1072 | */ | |
1073 | ||
66a464db MH |
1074 | static int |
1075 | __init debug_init(void) | |
1da177e4 LT |
1076 | { |
1077 | int rc = 0; | |
1078 | ||
0b4d4147 | 1079 | s390dbf_sysctl_header = register_sysctl_table(s390dbf_dir_table); |
e11f0d04 | 1080 | mutex_lock(&debug_mutex); |
66a464db | 1081 | debug_debugfs_root_entry = debugfs_create_dir(DEBUG_DIR_ROOT,NULL); |
1da177e4 | 1082 | initialized = 1; |
e11f0d04 | 1083 | mutex_unlock(&debug_mutex); |
1da177e4 LT |
1084 | |
1085 | return rc; | |
1086 | } | |
1087 | ||
1088 | /* | |
1089 | * debug_register_view: | |
1090 | */ | |
1091 | ||
66a464db MH |
1092 | int |
1093 | debug_register_view(debug_info_t * id, struct debug_view *view) | |
1da177e4 LT |
1094 | { |
1095 | int rc = 0; | |
1096 | int i; | |
1097 | unsigned long flags; | |
9637c3f3 | 1098 | mode_t mode; |
66a464db | 1099 | struct dentry *pde; |
1da177e4 LT |
1100 | |
1101 | if (!id) | |
1102 | goto out; | |
9637c3f3 MH |
1103 | mode = (id->mode | S_IFREG) & ~S_IXUGO; |
1104 | if (!(view->prolog_proc || view->format_proc || view->header_proc)) | |
1105 | mode &= ~(S_IRUSR | S_IRGRP | S_IROTH); | |
1106 | if (!view->input_proc) | |
1107 | mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH); | |
66a464db | 1108 | pde = debugfs_create_file(view->name, mode, id->debugfs_root_entry, |
942eaabd | 1109 | id , &debug_file_ops); |
1da177e4 | 1110 | if (!pde){ |
66a464db MH |
1111 | printk(KERN_WARNING "debug: debugfs_create_file() failed!"\ |
1112 | " Cannot register view %s/%s\n", id->name,view->name); | |
1da177e4 LT |
1113 | rc = -1; |
1114 | goto out; | |
1115 | } | |
1da177e4 LT |
1116 | spin_lock_irqsave(&id->lock, flags); |
1117 | for (i = 0; i < DEBUG_MAX_VIEWS; i++) { | |
66a464db | 1118 | if (!id->views[i]) |
1da177e4 LT |
1119 | break; |
1120 | } | |
1121 | if (i == DEBUG_MAX_VIEWS) { | |
1122 | printk(KERN_WARNING "debug: cannot register view %s/%s\n", | |
1123 | id->name,view->name); | |
1124 | printk(KERN_WARNING | |
1125 | "debug: maximum number of views reached (%i)!\n", i); | |
66a464db | 1126 | debugfs_remove(pde); |
1da177e4 | 1127 | rc = -1; |
66a464db | 1128 | } else { |
1da177e4 | 1129 | id->views[i] = view; |
66a464db | 1130 | id->debugfs_entries[i] = pde; |
1da177e4 LT |
1131 | } |
1132 | spin_unlock_irqrestore(&id->lock, flags); | |
66a464db | 1133 | out: |
1da177e4 LT |
1134 | return rc; |
1135 | } | |
1136 | ||
1137 | /* | |
1138 | * debug_unregister_view: | |
1139 | */ | |
1140 | ||
66a464db MH |
1141 | int |
1142 | debug_unregister_view(debug_info_t * id, struct debug_view *view) | |
1da177e4 LT |
1143 | { |
1144 | int rc = 0; | |
1145 | int i; | |
1146 | unsigned long flags; | |
1147 | ||
1148 | if (!id) | |
1149 | goto out; | |
1150 | spin_lock_irqsave(&id->lock, flags); | |
1151 | for (i = 0; i < DEBUG_MAX_VIEWS; i++) { | |
1152 | if (id->views[i] == view) | |
1153 | break; | |
1154 | } | |
1155 | if (i == DEBUG_MAX_VIEWS) | |
1156 | rc = -1; | |
1157 | else { | |
66a464db | 1158 | debugfs_remove(id->debugfs_entries[i]); |
1da177e4 LT |
1159 | id->views[i] = NULL; |
1160 | rc = 0; | |
1161 | } | |
1162 | spin_unlock_irqrestore(&id->lock, flags); | |
66a464db MH |
1163 | out: |
1164 | return rc; | |
1165 | } | |
1166 | ||
1167 | static inline char * | |
1168 | debug_get_user_string(const char __user *user_buf, size_t user_len) | |
1169 | { | |
1170 | char* buffer; | |
1171 | ||
1172 | buffer = kmalloc(user_len + 1, GFP_KERNEL); | |
1173 | if (!buffer) | |
1174 | return ERR_PTR(-ENOMEM); | |
1175 | if (copy_from_user(buffer, user_buf, user_len) != 0) { | |
1176 | kfree(buffer); | |
1177 | return ERR_PTR(-EFAULT); | |
1178 | } | |
1179 | /* got the string, now strip linefeed. */ | |
1180 | if (buffer[user_len - 1] == '\n') | |
1181 | buffer[user_len - 1] = 0; | |
1182 | else | |
1183 | buffer[user_len] = 0; | |
1184 | return buffer; | |
1185 | } | |
1186 | ||
1187 | static inline int | |
1188 | debug_get_uint(char *buf) | |
1189 | { | |
1190 | int rc; | |
1191 | ||
1192 | for(; isspace(*buf); buf++); | |
1193 | rc = simple_strtoul(buf, &buf, 10); | |
1194 | if(*buf){ | |
66a464db MH |
1195 | rc = -EINVAL; |
1196 | } | |
1da177e4 LT |
1197 | return rc; |
1198 | } | |
1199 | ||
1200 | /* | |
1201 | * functions for debug-views | |
1202 | *********************************** | |
1203 | */ | |
1204 | ||
1205 | /* | |
1206 | * prints out actual debug level | |
1207 | */ | |
1208 | ||
66a464db MH |
1209 | static int |
1210 | debug_prolog_pages_fn(debug_info_t * id, | |
1da177e4 | 1211 | struct debug_view *view, char *out_buf) |
66a464db MH |
1212 | { |
1213 | return sprintf(out_buf, "%i\n", id->pages_per_area); | |
1214 | } | |
1215 | ||
1216 | /* | |
1217 | * reads new size (number of pages per debug area) | |
1218 | */ | |
1219 | ||
1220 | static int | |
1221 | debug_input_pages_fn(debug_info_t * id, struct debug_view *view, | |
1222 | struct file *file, const char __user *user_buf, | |
1223 | size_t user_len, loff_t * offset) | |
1224 | { | |
1225 | char *str; | |
1226 | int rc,new_pages; | |
1227 | ||
1228 | if (user_len > 0x10000) | |
1229 | user_len = 0x10000; | |
1230 | if (*offset != 0){ | |
1231 | rc = -EPIPE; | |
1232 | goto out; | |
1233 | } | |
1234 | str = debug_get_user_string(user_buf,user_len); | |
1235 | if(IS_ERR(str)){ | |
1236 | rc = PTR_ERR(str); | |
1237 | goto out; | |
1238 | } | |
1239 | new_pages = debug_get_uint(str); | |
1240 | if(new_pages < 0){ | |
1241 | rc = -EINVAL; | |
1242 | goto free_str; | |
1243 | } | |
1244 | rc = debug_set_size(id,id->nr_areas, new_pages); | |
1245 | if(rc != 0){ | |
1246 | rc = -EINVAL; | |
1247 | goto free_str; | |
1248 | } | |
1249 | rc = user_len; | |
1250 | free_str: | |
1251 | kfree(str); | |
1252 | out: | |
1253 | *offset += user_len; | |
1254 | return rc; /* number of input characters */ | |
1255 | } | |
1256 | ||
1257 | /* | |
1258 | * prints out actual debug level | |
1259 | */ | |
1260 | ||
1261 | static int | |
1262 | debug_prolog_level_fn(debug_info_t * id, struct debug_view *view, char *out_buf) | |
1da177e4 LT |
1263 | { |
1264 | int rc = 0; | |
1265 | ||
66a464db MH |
1266 | if(id->level == DEBUG_OFF_LEVEL) { |
1267 | rc = sprintf(out_buf,"-\n"); | |
1268 | } | |
1269 | else { | |
1270 | rc = sprintf(out_buf, "%i\n", id->level); | |
1271 | } | |
1da177e4 LT |
1272 | return rc; |
1273 | } | |
1274 | ||
1275 | /* | |
1276 | * reads new debug level | |
1277 | */ | |
1278 | ||
66a464db MH |
1279 | static int |
1280 | debug_input_level_fn(debug_info_t * id, struct debug_view *view, | |
1281 | struct file *file, const char __user *user_buf, | |
1282 | size_t user_len, loff_t * offset) | |
1da177e4 | 1283 | { |
66a464db MH |
1284 | char *str; |
1285 | int rc,new_level; | |
1da177e4 | 1286 | |
66a464db MH |
1287 | if (user_len > 0x10000) |
1288 | user_len = 0x10000; | |
1289 | if (*offset != 0){ | |
1290 | rc = -EPIPE; | |
1da177e4 | 1291 | goto out; |
66a464db MH |
1292 | } |
1293 | str = debug_get_user_string(user_buf,user_len); | |
1294 | if(IS_ERR(str)){ | |
1295 | rc = PTR_ERR(str); | |
1da177e4 LT |
1296 | goto out; |
1297 | } | |
66a464db | 1298 | if(str[0] == '-'){ |
1da177e4 | 1299 | debug_set_level(id, DEBUG_OFF_LEVEL); |
66a464db MH |
1300 | rc = user_len; |
1301 | goto free_str; | |
1da177e4 | 1302 | } else { |
66a464db | 1303 | new_level = debug_get_uint(str); |
1da177e4 | 1304 | } |
66a464db MH |
1305 | if(new_level < 0) { |
1306 | printk(KERN_INFO "debug: level `%s` is not valid\n", str); | |
1307 | rc = -EINVAL; | |
1308 | } else { | |
1309 | debug_set_level(id, new_level); | |
1310 | rc = user_len; | |
1311 | } | |
1312 | free_str: | |
1313 | kfree(str); | |
1314 | out: | |
1315 | *offset += user_len; | |
1da177e4 LT |
1316 | return rc; /* number of input characters */ |
1317 | } | |
1318 | ||
1319 | ||
1320 | /* | |
1321 | * flushes debug areas | |
1322 | */ | |
1323 | ||
2b67fc46 | 1324 | static void debug_flush(debug_info_t* id, int area) |
1da177e4 LT |
1325 | { |
1326 | unsigned long flags; | |
66a464db | 1327 | int i,j; |
1da177e4 | 1328 | |
66a464db | 1329 | if(!id || !id->areas) |
1da177e4 LT |
1330 | return; |
1331 | spin_lock_irqsave(&id->lock,flags); | |
1332 | if(area == DEBUG_FLUSH_ALL){ | |
1333 | id->active_area = 0; | |
66a464db MH |
1334 | memset(id->active_entries, 0, id->nr_areas * sizeof(int)); |
1335 | for (i = 0; i < id->nr_areas; i++) { | |
1336 | id->active_pages[i] = 0; | |
1337 | for(j = 0; j < id->pages_per_area; j++) { | |
1338 | memset(id->areas[i][j], 0, PAGE_SIZE); | |
1339 | } | |
1340 | } | |
1da177e4 | 1341 | } else if(area >= 0 && area < id->nr_areas) { |
66a464db MH |
1342 | id->active_entries[area] = 0; |
1343 | id->active_pages[area] = 0; | |
1344 | for(i = 0; i < id->pages_per_area; i++) { | |
1345 | memset(id->areas[area][i],0,PAGE_SIZE); | |
1346 | } | |
1da177e4 LT |
1347 | } |
1348 | spin_unlock_irqrestore(&id->lock,flags); | |
1349 | } | |
1350 | ||
1351 | /* | |
1352 | * view function: flushes debug areas | |
1353 | */ | |
1354 | ||
66a464db MH |
1355 | static int |
1356 | debug_input_flush_fn(debug_info_t * id, struct debug_view *view, | |
1357 | struct file *file, const char __user *user_buf, | |
1358 | size_t user_len, loff_t * offset) | |
1da177e4 LT |
1359 | { |
1360 | char input_buf[1]; | |
66a464db MH |
1361 | int rc = user_len; |
1362 | ||
1363 | if (user_len > 0x10000) | |
1364 | user_len = 0x10000; | |
1365 | if (*offset != 0){ | |
1366 | rc = -EPIPE; | |
1da177e4 | 1367 | goto out; |
66a464db | 1368 | } |
1da177e4 LT |
1369 | if (copy_from_user(input_buf, user_buf, 1)){ |
1370 | rc = -EFAULT; | |
1371 | goto out; | |
1372 | } | |
1373 | if(input_buf[0] == '-') { | |
1374 | debug_flush(id, DEBUG_FLUSH_ALL); | |
1375 | goto out; | |
1376 | } | |
1377 | if (isdigit(input_buf[0])) { | |
1378 | int area = ((int) input_buf[0] - (int) '0'); | |
1379 | debug_flush(id, area); | |
1380 | goto out; | |
1381 | } | |
1382 | ||
1383 | printk(KERN_INFO "debug: area `%c` is not valid\n", input_buf[0]); | |
1384 | ||
66a464db MH |
1385 | out: |
1386 | *offset += user_len; | |
1da177e4 LT |
1387 | return rc; /* number of input characters */ |
1388 | } | |
1389 | ||
1390 | /* | |
1391 | * prints debug header in raw format | |
1392 | */ | |
1393 | ||
66a464db MH |
1394 | static int |
1395 | debug_raw_header_fn(debug_info_t * id, struct debug_view *view, | |
1396 | int area, debug_entry_t * entry, char *out_buf) | |
1da177e4 LT |
1397 | { |
1398 | int rc; | |
1399 | ||
1400 | rc = sizeof(debug_entry_t); | |
1401 | memcpy(out_buf,entry,sizeof(debug_entry_t)); | |
1402 | return rc; | |
1403 | } | |
1404 | ||
1405 | /* | |
1406 | * prints debug data in raw format | |
1407 | */ | |
1408 | ||
66a464db MH |
1409 | static int |
1410 | debug_raw_format_fn(debug_info_t * id, struct debug_view *view, | |
1da177e4 LT |
1411 | char *out_buf, const char *in_buf) |
1412 | { | |
1413 | int rc; | |
1414 | ||
1415 | rc = id->buf_size; | |
1416 | memcpy(out_buf, in_buf, id->buf_size); | |
1417 | return rc; | |
1418 | } | |
1419 | ||
1420 | /* | |
1421 | * prints debug data in hex/ascii format | |
1422 | */ | |
1423 | ||
66a464db MH |
1424 | static int |
1425 | debug_hex_ascii_format_fn(debug_info_t * id, struct debug_view *view, | |
1426 | char *out_buf, const char *in_buf) | |
1da177e4 LT |
1427 | { |
1428 | int i, rc = 0; | |
1429 | ||
1430 | for (i = 0; i < id->buf_size; i++) { | |
1431 | rc += sprintf(out_buf + rc, "%02x ", | |
1432 | ((unsigned char *) in_buf)[i]); | |
1433 | } | |
1434 | rc += sprintf(out_buf + rc, "| "); | |
1435 | for (i = 0; i < id->buf_size; i++) { | |
1436 | unsigned char c = in_buf[i]; | |
1437 | if (!isprint(c)) | |
1438 | rc += sprintf(out_buf + rc, "."); | |
1439 | else | |
1440 | rc += sprintf(out_buf + rc, "%c", c); | |
1441 | } | |
1442 | rc += sprintf(out_buf + rc, "\n"); | |
1443 | return rc; | |
1444 | } | |
1445 | ||
1446 | /* | |
1447 | * prints header for debug entry | |
1448 | */ | |
1449 | ||
66a464db MH |
1450 | int |
1451 | debug_dflt_header_fn(debug_info_t * id, struct debug_view *view, | |
1da177e4 LT |
1452 | int area, debug_entry_t * entry, char *out_buf) |
1453 | { | |
942eaabd | 1454 | struct timespec time_spec; |
1da177e4 LT |
1455 | unsigned long long time; |
1456 | char *except_str; | |
1457 | unsigned long caller; | |
1458 | int rc = 0; | |
1459 | unsigned int level; | |
1460 | ||
1461 | level = entry->id.fields.level; | |
1462 | time = entry->id.stck; | |
1463 | /* adjust todclock to 1970 */ | |
1464 | time -= 0x8126d60e46000000LL - (0x3c26700LL * 1000000 * 4096); | |
942eaabd | 1465 | tod_to_timeval(time, &time_spec); |
1da177e4 LT |
1466 | |
1467 | if (entry->id.fields.exception) | |
1468 | except_str = "*"; | |
1469 | else | |
1470 | except_str = "-"; | |
1471 | caller = ((unsigned long) entry->caller) & PSW_ADDR_INSN; | |
1472 | rc += sprintf(out_buf, "%02i %011lu:%06lu %1u %1s %02i %p ", | |
942eaabd | 1473 | area, time_spec.tv_sec, time_spec.tv_nsec / 1000, level, |
1da177e4 LT |
1474 | except_str, entry->id.fields.cpuid, (void *) caller); |
1475 | return rc; | |
1476 | } | |
1477 | ||
1478 | /* | |
1479 | * prints debug data sprintf-formated: | |
1480 | * debug_sprinf_event/exception calls must be used together with this view | |
1481 | */ | |
1482 | ||
1483 | #define DEBUG_SPRINTF_MAX_ARGS 10 | |
1484 | ||
66a464db MH |
1485 | static int |
1486 | debug_sprintf_format_fn(debug_info_t * id, struct debug_view *view, | |
1487 | char *out_buf, debug_sprintf_entry_t *curr_event) | |
1da177e4 LT |
1488 | { |
1489 | int num_longs, num_used_args = 0,i, rc = 0; | |
1490 | int index[DEBUG_SPRINTF_MAX_ARGS]; | |
1491 | ||
1492 | /* count of longs fit into one entry */ | |
1493 | num_longs = id->buf_size / sizeof(long); | |
1494 | ||
1495 | if(num_longs < 1) | |
1496 | goto out; /* bufsize of entry too small */ | |
1497 | if(num_longs == 1) { | |
1498 | /* no args, we use only the string */ | |
1499 | strcpy(out_buf, curr_event->string); | |
1500 | rc = strlen(curr_event->string); | |
1501 | goto out; | |
1502 | } | |
1503 | ||
1504 | /* number of arguments used for sprintf (without the format string) */ | |
1505 | num_used_args = min(DEBUG_SPRINTF_MAX_ARGS, (num_longs - 1)); | |
1506 | ||
1507 | memset(index,0, DEBUG_SPRINTF_MAX_ARGS * sizeof(int)); | |
1508 | ||
1509 | for(i = 0; i < num_used_args; i++) | |
1510 | index[i] = i; | |
1511 | ||
1512 | rc = sprintf(out_buf, curr_event->string, curr_event->args[index[0]], | |
1513 | curr_event->args[index[1]], curr_event->args[index[2]], | |
1514 | curr_event->args[index[3]], curr_event->args[index[4]], | |
1515 | curr_event->args[index[5]], curr_event->args[index[6]], | |
1516 | curr_event->args[index[7]], curr_event->args[index[8]], | |
1517 | curr_event->args[index[9]]); | |
1518 | ||
1519 | out: | |
1520 | ||
1521 | return rc; | |
1522 | } | |
1523 | ||
1524 | /* | |
1525 | * clean up module | |
1526 | */ | |
2b67fc46 | 1527 | static void __exit debug_exit(void) |
1da177e4 | 1528 | { |
66a464db | 1529 | debugfs_remove(debug_debugfs_root_entry); |
1da177e4 LT |
1530 | unregister_sysctl_table(s390dbf_sysctl_header); |
1531 | return; | |
1532 | } | |
1533 | ||
1534 | /* | |
1535 | * module definitions | |
1536 | */ | |
66a464db | 1537 | postcore_initcall(debug_init); |
1da177e4 LT |
1538 | module_exit(debug_exit); |
1539 | MODULE_LICENSE("GPL"); | |
1540 | ||
1541 | EXPORT_SYMBOL(debug_register); | |
1542 | EXPORT_SYMBOL(debug_unregister); | |
1543 | EXPORT_SYMBOL(debug_set_level); | |
1544 | EXPORT_SYMBOL(debug_stop_all); | |
1545 | EXPORT_SYMBOL(debug_register_view); | |
1546 | EXPORT_SYMBOL(debug_unregister_view); | |
1547 | EXPORT_SYMBOL(debug_event_common); | |
1548 | EXPORT_SYMBOL(debug_exception_common); | |
1549 | EXPORT_SYMBOL(debug_hex_ascii_view); | |
1550 | EXPORT_SYMBOL(debug_raw_view); | |
1551 | EXPORT_SYMBOL(debug_dflt_header_fn); | |
1552 | EXPORT_SYMBOL(debug_sprintf_view); | |
1553 | EXPORT_SYMBOL(debug_sprintf_exception); | |
1554 | EXPORT_SYMBOL(debug_sprintf_event); |