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 | ||
c5612c19 MH |
13 | #define KMSG_COMPONENT "s390dbf" |
14 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
15 | ||
1da177e4 LT |
16 | #include <linux/stddef.h> |
17 | #include <linux/kernel.h> | |
18 | #include <linux/errno.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/ctype.h> | |
21 | #include <linux/sysctl.h> | |
22 | #include <asm/uaccess.h> | |
1da177e4 LT |
23 | #include <linux/module.h> |
24 | #include <linux/init.h> | |
66a464db MH |
25 | #include <linux/fs.h> |
26 | #include <linux/debugfs.h> | |
1da177e4 LT |
27 | |
28 | #include <asm/debug.h> | |
29 | ||
30 | #define DEBUG_PROLOG_ENTRY -1 | |
31 | ||
66a464db MH |
32 | #define ALL_AREAS 0 /* copy all debug areas */ |
33 | #define NO_AREAS 1 /* copy no debug areas */ | |
34 | ||
1da177e4 LT |
35 | /* typedefs */ |
36 | ||
37 | typedef struct file_private_info { | |
38 | loff_t offset; /* offset of last read in file */ | |
39 | int act_area; /* number of last formated area */ | |
66a464db | 40 | int act_page; /* act page in given area */ |
1da177e4 LT |
41 | int act_entry; /* last formated entry (offset */ |
42 | /* relative to beginning of last */ | |
66a464db | 43 | /* formated page) */ |
1da177e4 LT |
44 | size_t act_entry_offset; /* up to this offset we copied */ |
45 | /* in last read the last formated */ | |
46 | /* entry to userland */ | |
47 | char temp_buf[2048]; /* buffer for output */ | |
48 | debug_info_t *debug_info_org; /* original debug information */ | |
49 | debug_info_t *debug_info_snap; /* snapshot of debug information */ | |
50 | struct debug_view *view; /* used view of debug info */ | |
51 | } file_private_info_t; | |
52 | ||
53 | typedef struct | |
54 | { | |
55 | char *string; | |
56 | /* | |
57 | * This assumes that all args are converted into longs | |
58 | * on L/390 this is the case for all types of parameter | |
59 | * except of floats, and long long (32 bit) | |
66a464db MH |
60 | * |
61 | */ | |
1da177e4 LT |
62 | long args[0]; |
63 | } debug_sprintf_entry_t; | |
64 | ||
65 | ||
1da177e4 LT |
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); | |
5cbbf16a | 75 | static debug_info_t *debug_info_create(const char *name, int pages_per_area, |
9637c3f3 | 76 | int nr_areas, int buf_size, mode_t mode); |
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 */ |
a806170e | 160 | static unsigned int __used debug_feature_version = __DEBUG_FEATURE_VERSION; |
1da177e4 LT |
161 | |
162 | /* static globals */ | |
163 | ||
164 | static debug_info_t *debug_area_first = NULL; | |
165 | static debug_info_t *debug_area_last = NULL; | |
e11f0d04 | 166 | static DEFINE_MUTEX(debug_mutex); |
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 | 237 | static debug_info_t* |
5cbbf16a CH |
238 | debug_info_alloc(const char *name, int pages_per_area, int nr_areas, |
239 | int buf_size, 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; | |
20cb9e79 | 271 | strlcpy(rc->name, name, sizeof(rc->name)); |
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 | 329 | static debug_info_t* |
5cbbf16a CH |
330 | debug_info_create(const char *name, int pages_per_area, int nr_areas, |
331 | int buf_size, mode_t mode) | |
1da177e4 LT |
332 | { |
333 | debug_info_t* rc; | |
334 | ||
66a464db MH |
335 | rc = debug_info_alloc(name, pages_per_area, nr_areas, buf_size, |
336 | DEBUG_DEFAULT_LEVEL, ALL_AREAS); | |
1da177e4 LT |
337 | if(!rc) |
338 | goto out; | |
339 | ||
9637c3f3 MH |
340 | rc->mode = mode & ~S_IFMT; |
341 | ||
66a464db MH |
342 | /* create root directory */ |
343 | rc->debugfs_root_entry = debugfs_create_dir(rc->name, | |
344 | debug_debugfs_root_entry); | |
1da177e4 LT |
345 | |
346 | /* append new element to linked list */ | |
66a464db | 347 | if (!debug_area_first) { |
1da177e4 LT |
348 | /* first element in list */ |
349 | debug_area_first = rc; | |
350 | rc->prev = NULL; | |
351 | } else { | |
352 | /* append element to end of list */ | |
353 | debug_area_last->next = rc; | |
354 | rc->prev = debug_area_last; | |
355 | } | |
356 | debug_area_last = rc; | |
357 | rc->next = NULL; | |
358 | ||
359 | debug_info_get(rc); | |
360 | out: | |
361 | return rc; | |
362 | } | |
363 | ||
364 | /* | |
365 | * debug_info_copy | |
366 | * - copy debug-info | |
367 | */ | |
368 | ||
66a464db MH |
369 | static debug_info_t* |
370 | debug_info_copy(debug_info_t* in, int mode) | |
1da177e4 | 371 | { |
66a464db | 372 | int i,j; |
1da177e4 | 373 | debug_info_t* rc; |
942eaabd MH |
374 | unsigned long flags; |
375 | ||
376 | /* get a consistent copy of the debug areas */ | |
377 | do { | |
378 | rc = debug_info_alloc(in->name, in->pages_per_area, | |
379 | in->nr_areas, in->buf_size, in->level, mode); | |
380 | spin_lock_irqsave(&in->lock, flags); | |
381 | if(!rc) | |
382 | goto out; | |
383 | /* has something changed in the meantime ? */ | |
384 | if((rc->pages_per_area == in->pages_per_area) && | |
385 | (rc->nr_areas == in->nr_areas)) { | |
386 | break; | |
387 | } | |
388 | spin_unlock_irqrestore(&in->lock, flags); | |
389 | debug_info_free(rc); | |
390 | } while (1); | |
66a464db | 391 | |
acfa922c | 392 | if (mode == NO_AREAS) |
1da177e4 LT |
393 | goto out; |
394 | ||
395 | for(i = 0; i < in->nr_areas; i++){ | |
66a464db MH |
396 | for(j = 0; j < in->pages_per_area; j++) { |
397 | memcpy(rc->areas[i][j], in->areas[i][j],PAGE_SIZE); | |
398 | } | |
1da177e4 LT |
399 | } |
400 | out: | |
942eaabd | 401 | spin_unlock_irqrestore(&in->lock, flags); |
1da177e4 LT |
402 | return rc; |
403 | } | |
404 | ||
405 | /* | |
406 | * debug_info_get | |
407 | * - increments reference count for debug-info | |
408 | */ | |
409 | ||
66a464db MH |
410 | static void |
411 | debug_info_get(debug_info_t * db_info) | |
1da177e4 LT |
412 | { |
413 | if (db_info) | |
414 | atomic_inc(&db_info->ref_count); | |
415 | } | |
416 | ||
417 | /* | |
418 | * debug_info_put: | |
419 | * - decreases reference count for debug-info and frees it if necessary | |
420 | */ | |
421 | ||
66a464db MH |
422 | static void |
423 | debug_info_put(debug_info_t *db_info) | |
1da177e4 LT |
424 | { |
425 | int i; | |
426 | ||
427 | if (!db_info) | |
428 | return; | |
429 | if (atomic_dec_and_test(&db_info->ref_count)) { | |
1da177e4 | 430 | for (i = 0; i < DEBUG_MAX_VIEWS; i++) { |
66a464db | 431 | if (!db_info->views[i]) |
1da177e4 | 432 | continue; |
66a464db | 433 | debugfs_remove(db_info->debugfs_entries[i]); |
1da177e4 | 434 | } |
66a464db | 435 | debugfs_remove(db_info->debugfs_root_entry); |
1da177e4 LT |
436 | if(db_info == debug_area_first) |
437 | debug_area_first = db_info->next; | |
438 | if(db_info == debug_area_last) | |
439 | debug_area_last = db_info->prev; | |
440 | if(db_info->prev) db_info->prev->next = db_info->next; | |
441 | if(db_info->next) db_info->next->prev = db_info->prev; | |
442 | debug_info_free(db_info); | |
443 | } | |
444 | } | |
445 | ||
446 | /* | |
447 | * debug_format_entry: | |
448 | * - format one debug entry and return size of formated data | |
449 | */ | |
450 | ||
66a464db MH |
451 | static int |
452 | debug_format_entry(file_private_info_t *p_info) | |
1da177e4 | 453 | { |
1da177e4 LT |
454 | debug_info_t *id_snap = p_info->debug_info_snap; |
455 | struct debug_view *view = p_info->view; | |
456 | debug_entry_t *act_entry; | |
457 | size_t len = 0; | |
458 | if(p_info->act_entry == DEBUG_PROLOG_ENTRY){ | |
459 | /* print prolog */ | |
460 | if (view->prolog_proc) | |
66a464db | 461 | len += view->prolog_proc(id_snap,view,p_info->temp_buf); |
1da177e4 LT |
462 | goto out; |
463 | } | |
66a464db MH |
464 | if (!id_snap->areas) /* this is true, if we have a prolog only view */ |
465 | goto out; /* or if 'pages_per_area' is 0 */ | |
466 | act_entry = (debug_entry_t *) ((char*)id_snap->areas[p_info->act_area] | |
467 | [p_info->act_page] + p_info->act_entry); | |
1da177e4 LT |
468 | |
469 | if (act_entry->id.stck == 0LL) | |
470 | goto out; /* empty entry */ | |
471 | if (view->header_proc) | |
66a464db | 472 | len += view->header_proc(id_snap, view, p_info->act_area, |
1da177e4 LT |
473 | act_entry, p_info->temp_buf + len); |
474 | if (view->format_proc) | |
66a464db | 475 | len += view->format_proc(id_snap, view, p_info->temp_buf + len, |
1da177e4 | 476 | DEBUG_DATA(act_entry)); |
66a464db | 477 | out: |
1da177e4 LT |
478 | return len; |
479 | } | |
480 | ||
481 | /* | |
482 | * debug_next_entry: | |
483 | * - goto next entry in p_info | |
484 | */ | |
485 | ||
4448aaf0 | 486 | static inline int |
66a464db | 487 | debug_next_entry(file_private_info_t *p_info) |
1da177e4 | 488 | { |
66a464db MH |
489 | debug_info_t *id; |
490 | ||
491 | id = p_info->debug_info_snap; | |
1da177e4 LT |
492 | if(p_info->act_entry == DEBUG_PROLOG_ENTRY){ |
493 | p_info->act_entry = 0; | |
66a464db | 494 | p_info->act_page = 0; |
1da177e4 LT |
495 | goto out; |
496 | } | |
66a464db MH |
497 | if(!id->areas) |
498 | return 1; | |
499 | p_info->act_entry += id->entry_size; | |
500 | /* switch to next page, if we reached the end of the page */ | |
501 | if (p_info->act_entry > (PAGE_SIZE - id->entry_size)){ | |
502 | /* next page */ | |
1da177e4 | 503 | p_info->act_entry = 0; |
66a464db MH |
504 | p_info->act_page += 1; |
505 | if((p_info->act_page % id->pages_per_area) == 0) { | |
506 | /* next area */ | |
507 | p_info->act_area++; | |
508 | p_info->act_page=0; | |
509 | } | |
1da177e4 LT |
510 | if(p_info->act_area >= id->nr_areas) |
511 | return 1; | |
512 | } | |
513 | out: | |
514 | return 0; | |
515 | } | |
516 | ||
517 | /* | |
518 | * debug_output: | |
519 | * - called for user read() | |
520 | * - copies formated debug entries to the user buffer | |
521 | */ | |
522 | ||
66a464db MH |
523 | static ssize_t |
524 | debug_output(struct file *file, /* file descriptor */ | |
525 | char __user *user_buf, /* user buffer */ | |
526 | size_t len, /* length of buffer */ | |
527 | loff_t *offset) /* offset in the file */ | |
1da177e4 LT |
528 | { |
529 | size_t count = 0; | |
66a464db | 530 | size_t entry_offset; |
1da177e4 LT |
531 | file_private_info_t *p_info; |
532 | ||
533 | p_info = ((file_private_info_t *) file->private_data); | |
534 | if (*offset != p_info->offset) | |
535 | return -EPIPE; | |
536 | if(p_info->act_area >= p_info->debug_info_snap->nr_areas) | |
537 | return 0; | |
1da177e4 | 538 | entry_offset = p_info->act_entry_offset; |
1da177e4 | 539 | while(count < len){ |
66a464db MH |
540 | int formatted_line_size; |
541 | int formatted_line_residue; | |
542 | int user_buf_residue; | |
543 | size_t copy_size; | |
544 | ||
545 | formatted_line_size = debug_format_entry(p_info); | |
546 | formatted_line_residue = formatted_line_size - entry_offset; | |
547 | user_buf_residue = len-count; | |
548 | copy_size = min(user_buf_residue, formatted_line_residue); | |
549 | if(copy_size){ | |
550 | if (copy_to_user(user_buf + count, p_info->temp_buf | |
551 | + entry_offset, copy_size)) | |
552 | return -EFAULT; | |
553 | count += copy_size; | |
554 | entry_offset += copy_size; | |
1da177e4 | 555 | } |
66a464db MH |
556 | if(copy_size == formatted_line_residue){ |
557 | entry_offset = 0; | |
558 | if(debug_next_entry(p_info)) | |
1da177e4 | 559 | goto out; |
66a464db | 560 | } |
1da177e4 LT |
561 | } |
562 | out: | |
563 | p_info->offset = *offset + count; | |
66a464db | 564 | p_info->act_entry_offset = entry_offset; |
1da177e4 LT |
565 | *offset = p_info->offset; |
566 | return count; | |
567 | } | |
568 | ||
569 | /* | |
570 | * debug_input: | |
571 | * - called for user write() | |
572 | * - calls input function of view | |
573 | */ | |
574 | ||
66a464db MH |
575 | static ssize_t |
576 | debug_input(struct file *file, const char __user *user_buf, size_t length, | |
577 | loff_t *offset) | |
1da177e4 LT |
578 | { |
579 | int rc = 0; | |
580 | file_private_info_t *p_info; | |
581 | ||
e11f0d04 | 582 | mutex_lock(&debug_mutex); |
1da177e4 LT |
583 | p_info = ((file_private_info_t *) file->private_data); |
584 | if (p_info->view->input_proc) | |
585 | rc = p_info->view->input_proc(p_info->debug_info_org, | |
586 | p_info->view, file, user_buf, | |
587 | length, offset); | |
588 | else | |
589 | rc = -EPERM; | |
e11f0d04 | 590 | mutex_unlock(&debug_mutex); |
1da177e4 LT |
591 | return rc; /* number of input characters */ |
592 | } | |
593 | ||
594 | /* | |
595 | * debug_open: | |
596 | * - called for user open() | |
597 | * - copies formated output to private_data area of the file | |
598 | * handle | |
599 | */ | |
600 | ||
66a464db MH |
601 | static int |
602 | debug_open(struct inode *inode, struct file *file) | |
1da177e4 | 603 | { |
a0fa8e37 | 604 | int i, rc = 0; |
1da177e4 LT |
605 | file_private_info_t *p_info; |
606 | debug_info_t *debug_info, *debug_info_snapshot; | |
607 | ||
e11f0d04 | 608 | mutex_lock(&debug_mutex); |
d20343e7 | 609 | debug_info = file->f_path.dentry->d_inode->i_private; |
942eaabd MH |
610 | /* find debug view */ |
611 | for (i = 0; i < DEBUG_MAX_VIEWS; i++) { | |
612 | if (!debug_info->views[i]) | |
613 | continue; | |
614 | else if (debug_info->debugfs_entries[i] == | |
d20343e7 | 615 | file->f_path.dentry) { |
942eaabd | 616 | goto found; /* found view ! */ |
1da177e4 | 617 | } |
1da177e4 LT |
618 | } |
619 | /* no entry found */ | |
620 | rc = -EINVAL; | |
621 | goto out; | |
622 | ||
66a464db | 623 | found: |
1da177e4 | 624 | |
66a464db MH |
625 | /* Make snapshot of current debug areas to get it consistent. */ |
626 | /* To copy all the areas is only needed, if we have a view which */ | |
627 | /* formats the debug areas. */ | |
1da177e4 | 628 | |
66a464db MH |
629 | if(!debug_info->views[i]->format_proc && |
630 | !debug_info->views[i]->header_proc){ | |
631 | debug_info_snapshot = debug_info_copy(debug_info, NO_AREAS); | |
632 | } else { | |
633 | debug_info_snapshot = debug_info_copy(debug_info, ALL_AREAS); | |
634 | } | |
1da177e4 LT |
635 | |
636 | if(!debug_info_snapshot){ | |
1da177e4 LT |
637 | rc = -ENOMEM; |
638 | goto out; | |
639 | } | |
5cbded58 | 640 | p_info = kmalloc(sizeof(file_private_info_t), |
66a464db MH |
641 | GFP_KERNEL); |
642 | if(!p_info){ | |
58ace9f2 | 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)) | |
c5612c19 MH |
696 | pr_warning("Root becomes the owner of all s390dbf files " |
697 | "in sysfs\n"); | |
6aa0d3a9 | 698 | BUG_ON(!initialized); |
e11f0d04 | 699 | mutex_lock(&debug_mutex); |
1da177e4 LT |
700 | |
701 | /* create new debug_info */ | |
702 | ||
9637c3f3 | 703 | rc = debug_info_create(name, pages_per_area, nr_areas, buf_size, mode); |
1da177e4 LT |
704 | if(!rc) |
705 | goto out; | |
706 | debug_register_view(rc, &debug_level_view); | |
707 | debug_register_view(rc, &debug_flush_view); | |
66a464db MH |
708 | debug_register_view(rc, &debug_pages_view); |
709 | out: | |
710 | if (!rc){ | |
c5612c19 | 711 | pr_err("Registering debug feature %s failed\n", name); |
1da177e4 | 712 | } |
e11f0d04 | 713 | mutex_unlock(&debug_mutex); |
1da177e4 LT |
714 | return rc; |
715 | } | |
9637c3f3 MH |
716 | EXPORT_SYMBOL(debug_register_mode); |
717 | ||
718 | /* | |
719 | * debug_register: | |
720 | * - creates and initializes debug area for the caller | |
721 | * - returns handle for debug area | |
722 | */ | |
723 | ||
5cbbf16a CH |
724 | debug_info_t *debug_register(const char *name, int pages_per_area, |
725 | int nr_areas, int buf_size) | |
9637c3f3 MH |
726 | { |
727 | return debug_register_mode(name, pages_per_area, nr_areas, buf_size, | |
728 | S_IRUSR | S_IWUSR, 0, 0); | |
729 | } | |
1da177e4 LT |
730 | |
731 | /* | |
732 | * debug_unregister: | |
733 | * - give back debug area | |
734 | */ | |
735 | ||
66a464db MH |
736 | void |
737 | debug_unregister(debug_info_t * id) | |
1da177e4 LT |
738 | { |
739 | if (!id) | |
740 | goto out; | |
e11f0d04 | 741 | mutex_lock(&debug_mutex); |
1da177e4 | 742 | debug_info_put(id); |
e11f0d04 | 743 | mutex_unlock(&debug_mutex); |
1da177e4 | 744 | |
66a464db | 745 | out: |
1da177e4 LT |
746 | return; |
747 | } | |
748 | ||
66a464db MH |
749 | /* |
750 | * debug_set_size: | |
751 | * - set area size (number of pages) and number of areas | |
752 | */ | |
753 | static int | |
754 | debug_set_size(debug_info_t* id, int nr_areas, int pages_per_area) | |
755 | { | |
756 | unsigned long flags; | |
757 | debug_entry_t *** new_areas; | |
758 | int rc=0; | |
759 | ||
760 | if(!id || (nr_areas <= 0) || (pages_per_area < 0)) | |
761 | return -EINVAL; | |
762 | if(pages_per_area > 0){ | |
763 | new_areas = debug_areas_alloc(pages_per_area, nr_areas); | |
764 | if(!new_areas) { | |
c5612c19 MH |
765 | pr_info("Allocating memory for %i pages failed\n", |
766 | pages_per_area); | |
66a464db MH |
767 | rc = -ENOMEM; |
768 | goto out; | |
769 | } | |
770 | } else { | |
771 | new_areas = NULL; | |
772 | } | |
773 | spin_lock_irqsave(&id->lock,flags); | |
774 | debug_areas_free(id); | |
775 | id->areas = new_areas; | |
776 | id->nr_areas = nr_areas; | |
777 | id->pages_per_area = pages_per_area; | |
778 | id->active_area = 0; | |
779 | memset(id->active_entries,0,sizeof(int)*id->nr_areas); | |
780 | memset(id->active_pages, 0, sizeof(int)*id->nr_areas); | |
781 | spin_unlock_irqrestore(&id->lock,flags); | |
c5612c19 | 782 | pr_info("%s: set new size (%i pages)\n" ,id->name, pages_per_area); |
66a464db MH |
783 | out: |
784 | return rc; | |
785 | } | |
786 | ||
1da177e4 LT |
787 | /* |
788 | * debug_set_level: | |
789 | * - set actual debug level | |
790 | */ | |
791 | ||
66a464db MH |
792 | void |
793 | debug_set_level(debug_info_t* id, int new_level) | |
1da177e4 LT |
794 | { |
795 | unsigned long flags; | |
796 | if(!id) | |
797 | return; | |
798 | spin_lock_irqsave(&id->lock,flags); | |
799 | if(new_level == DEBUG_OFF_LEVEL){ | |
800 | id->level = DEBUG_OFF_LEVEL; | |
c5612c19 | 801 | pr_info("%s: switched off\n",id->name); |
1da177e4 | 802 | } else if ((new_level > DEBUG_MAX_LEVEL) || (new_level < 0)) { |
c5612c19 | 803 | pr_info("%s: level %i is out of range (%i - %i)\n", |
1da177e4 LT |
804 | id->name, new_level, 0, DEBUG_MAX_LEVEL); |
805 | } else { | |
806 | id->level = new_level; | |
1da177e4 LT |
807 | } |
808 | spin_unlock_irqrestore(&id->lock,flags); | |
809 | } | |
810 | ||
811 | ||
812 | /* | |
813 | * proceed_active_entry: | |
814 | * - set active entry to next in the ring buffer | |
815 | */ | |
816 | ||
4448aaf0 | 817 | static inline void |
66a464db | 818 | proceed_active_entry(debug_info_t * id) |
1da177e4 | 819 | { |
66a464db MH |
820 | if ((id->active_entries[id->active_area] += id->entry_size) |
821 | > (PAGE_SIZE - id->entry_size)){ | |
822 | id->active_entries[id->active_area] = 0; | |
823 | id->active_pages[id->active_area] = | |
824 | (id->active_pages[id->active_area] + 1) % | |
825 | id->pages_per_area; | |
826 | } | |
1da177e4 LT |
827 | } |
828 | ||
829 | /* | |
830 | * proceed_active_area: | |
831 | * - set active area to next in the ring buffer | |
832 | */ | |
833 | ||
4448aaf0 | 834 | static inline void |
66a464db | 835 | proceed_active_area(debug_info_t * id) |
1da177e4 LT |
836 | { |
837 | id->active_area++; | |
838 | id->active_area = id->active_area % id->nr_areas; | |
839 | } | |
840 | ||
841 | /* | |
842 | * get_active_entry: | |
843 | */ | |
844 | ||
4448aaf0 | 845 | static inline debug_entry_t* |
66a464db | 846 | get_active_entry(debug_info_t * id) |
1da177e4 | 847 | { |
66a464db MH |
848 | return (debug_entry_t *) (((char *) id->areas[id->active_area] |
849 | [id->active_pages[id->active_area]]) + | |
850 | id->active_entries[id->active_area]); | |
1da177e4 LT |
851 | } |
852 | ||
853 | /* | |
854 | * debug_finish_entry: | |
855 | * - set timestamp, caller address, cpu number etc. | |
856 | */ | |
857 | ||
4448aaf0 | 858 | static inline void |
66a464db MH |
859 | debug_finish_entry(debug_info_t * id, debug_entry_t* active, int level, |
860 | int exception) | |
1da177e4 | 861 | { |
942eaabd | 862 | active->id.stck = get_clock(); |
1da177e4 LT |
863 | active->id.fields.cpuid = smp_processor_id(); |
864 | active->caller = __builtin_return_address(0); | |
865 | active->id.fields.exception = exception; | |
866 | active->id.fields.level = level; | |
867 | proceed_active_entry(id); | |
868 | if(exception) | |
869 | proceed_active_area(id); | |
870 | } | |
871 | ||
872 | static int debug_stoppable=1; | |
873 | static int debug_active=1; | |
874 | ||
1da177e4 LT |
875 | #define CTL_S390DBF_STOPPABLE 5678 |
876 | #define CTL_S390DBF_ACTIVE 5679 | |
877 | ||
878 | /* | |
879 | * proc handler for the running debug_active sysctl | |
880 | * always allow read, allow write only if debug_stoppable is set or | |
881 | * if debug_active is already off | |
882 | */ | |
66a464db MH |
883 | static int |
884 | s390dbf_procactive(ctl_table *table, int write, struct file *filp, | |
1da177e4 LT |
885 | void __user *buffer, size_t *lenp, loff_t *ppos) |
886 | { | |
887 | if (!write || debug_stoppable || !debug_active) | |
888 | return proc_dointvec(table, write, filp, buffer, lenp, ppos); | |
889 | else | |
890 | return 0; | |
891 | } | |
892 | ||
893 | ||
894 | static struct ctl_table s390dbf_table[] = { | |
895 | { | |
896 | .ctl_name = CTL_S390DBF_STOPPABLE, | |
897 | .procname = "debug_stoppable", | |
898 | .data = &debug_stoppable, | |
899 | .maxlen = sizeof(int), | |
900 | .mode = S_IRUGO | S_IWUSR, | |
901 | .proc_handler = &proc_dointvec, | |
902 | .strategy = &sysctl_intvec, | |
903 | }, | |
904 | { | |
905 | .ctl_name = CTL_S390DBF_ACTIVE, | |
906 | .procname = "debug_active", | |
907 | .data = &debug_active, | |
908 | .maxlen = sizeof(int), | |
909 | .mode = S_IRUGO | S_IWUSR, | |
910 | .proc_handler = &s390dbf_procactive, | |
911 | .strategy = &sysctl_intvec, | |
912 | }, | |
913 | { .ctl_name = 0 } | |
914 | }; | |
915 | ||
916 | static struct ctl_table s390dbf_dir_table[] = { | |
917 | { | |
918 | .ctl_name = CTL_S390DBF, | |
919 | .procname = "s390dbf", | |
920 | .maxlen = 0, | |
921 | .mode = S_IRUGO | S_IXUGO, | |
922 | .child = s390dbf_table, | |
923 | }, | |
924 | { .ctl_name = 0 } | |
925 | }; | |
926 | ||
2b67fc46 | 927 | static struct ctl_table_header *s390dbf_sysctl_header; |
1da177e4 | 928 | |
66a464db MH |
929 | void |
930 | debug_stop_all(void) | |
1da177e4 LT |
931 | { |
932 | if (debug_stoppable) | |
933 | debug_active = 0; | |
934 | } | |
935 | ||
936 | ||
937 | /* | |
938 | * debug_event_common: | |
939 | * - write debug entry with given size | |
940 | */ | |
941 | ||
66a464db MH |
942 | debug_entry_t* |
943 | debug_event_common(debug_info_t * id, int level, const void *buf, int len) | |
1da177e4 LT |
944 | { |
945 | unsigned long flags; | |
946 | debug_entry_t *active; | |
947 | ||
66a464db | 948 | if (!debug_active || !id->areas) |
1da177e4 LT |
949 | return NULL; |
950 | spin_lock_irqsave(&id->lock, flags); | |
951 | active = get_active_entry(id); | |
952 | memset(DEBUG_DATA(active), 0, id->buf_size); | |
953 | memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size)); | |
954 | debug_finish_entry(id, active, level, 0); | |
955 | spin_unlock_irqrestore(&id->lock, flags); | |
956 | ||
957 | return active; | |
958 | } | |
959 | ||
960 | /* | |
961 | * debug_exception_common: | |
962 | * - write debug entry with given size and switch to next debug area | |
963 | */ | |
964 | ||
66a464db MH |
965 | debug_entry_t |
966 | *debug_exception_common(debug_info_t * id, int level, const void *buf, int len) | |
1da177e4 LT |
967 | { |
968 | unsigned long flags; | |
969 | debug_entry_t *active; | |
970 | ||
66a464db | 971 | if (!debug_active || !id->areas) |
1da177e4 LT |
972 | return NULL; |
973 | spin_lock_irqsave(&id->lock, flags); | |
974 | active = get_active_entry(id); | |
975 | memset(DEBUG_DATA(active), 0, id->buf_size); | |
976 | memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size)); | |
977 | debug_finish_entry(id, active, level, 1); | |
978 | spin_unlock_irqrestore(&id->lock, flags); | |
979 | ||
980 | return active; | |
981 | } | |
982 | ||
983 | /* | |
984 | * counts arguments in format string for sprintf view | |
985 | */ | |
986 | ||
4448aaf0 | 987 | static inline int |
66a464db | 988 | debug_count_numargs(char *string) |
1da177e4 LT |
989 | { |
990 | int numargs=0; | |
991 | ||
992 | while(*string) { | |
993 | if(*string++=='%') | |
994 | numargs++; | |
995 | } | |
996 | return(numargs); | |
997 | } | |
998 | ||
999 | /* | |
1000 | * debug_sprintf_event: | |
1001 | */ | |
1002 | ||
66a464db MH |
1003 | debug_entry_t* |
1004 | debug_sprintf_event(debug_info_t* id, int level,char *string,...) | |
1da177e4 LT |
1005 | { |
1006 | va_list ap; | |
1007 | int numargs,idx; | |
1008 | unsigned long flags; | |
1009 | debug_sprintf_entry_t *curr_event; | |
1010 | debug_entry_t *active; | |
1011 | ||
1012 | if((!id) || (level > id->level)) | |
1013 | return NULL; | |
66a464db | 1014 | if (!debug_active || !id->areas) |
1da177e4 LT |
1015 | return NULL; |
1016 | numargs=debug_count_numargs(string); | |
1017 | ||
1018 | spin_lock_irqsave(&id->lock, flags); | |
1019 | active = get_active_entry(id); | |
1020 | curr_event=(debug_sprintf_entry_t *) DEBUG_DATA(active); | |
1021 | va_start(ap,string); | |
1022 | curr_event->string=string; | |
1023 | for(idx=0;idx<min(numargs,(int)(id->buf_size / sizeof(long))-1);idx++) | |
1024 | curr_event->args[idx]=va_arg(ap,long); | |
1025 | va_end(ap); | |
1026 | debug_finish_entry(id, active, level, 0); | |
1027 | spin_unlock_irqrestore(&id->lock, flags); | |
1028 | ||
1029 | return active; | |
1030 | } | |
1031 | ||
1032 | /* | |
1033 | * debug_sprintf_exception: | |
1034 | */ | |
1035 | ||
66a464db MH |
1036 | debug_entry_t* |
1037 | debug_sprintf_exception(debug_info_t* id, int level,char *string,...) | |
1da177e4 LT |
1038 | { |
1039 | va_list ap; | |
1040 | int numargs,idx; | |
1041 | unsigned long flags; | |
1042 | debug_sprintf_entry_t *curr_event; | |
1043 | debug_entry_t *active; | |
1044 | ||
1045 | if((!id) || (level > id->level)) | |
1046 | return NULL; | |
66a464db | 1047 | if (!debug_active || !id->areas) |
1da177e4 LT |
1048 | return NULL; |
1049 | ||
1050 | numargs=debug_count_numargs(string); | |
1051 | ||
1052 | spin_lock_irqsave(&id->lock, flags); | |
1053 | active = get_active_entry(id); | |
1054 | curr_event=(debug_sprintf_entry_t *)DEBUG_DATA(active); | |
1055 | va_start(ap,string); | |
1056 | curr_event->string=string; | |
1057 | for(idx=0;idx<min(numargs,(int)(id->buf_size / sizeof(long))-1);idx++) | |
1058 | curr_event->args[idx]=va_arg(ap,long); | |
1059 | va_end(ap); | |
1060 | debug_finish_entry(id, active, level, 1); | |
1061 | spin_unlock_irqrestore(&id->lock, flags); | |
1062 | ||
1063 | return active; | |
1064 | } | |
1065 | ||
1066 | /* | |
1067 | * debug_init: | |
1068 | * - is called exactly once to initialize the debug feature | |
1069 | */ | |
1070 | ||
66a464db MH |
1071 | static int |
1072 | __init debug_init(void) | |
1da177e4 LT |
1073 | { |
1074 | int rc = 0; | |
1075 | ||
0b4d4147 | 1076 | s390dbf_sysctl_header = register_sysctl_table(s390dbf_dir_table); |
e11f0d04 | 1077 | mutex_lock(&debug_mutex); |
66a464db | 1078 | debug_debugfs_root_entry = debugfs_create_dir(DEBUG_DIR_ROOT,NULL); |
1da177e4 | 1079 | initialized = 1; |
e11f0d04 | 1080 | mutex_unlock(&debug_mutex); |
1da177e4 LT |
1081 | |
1082 | return rc; | |
1083 | } | |
1084 | ||
1085 | /* | |
1086 | * debug_register_view: | |
1087 | */ | |
1088 | ||
66a464db MH |
1089 | int |
1090 | debug_register_view(debug_info_t * id, struct debug_view *view) | |
1da177e4 LT |
1091 | { |
1092 | int rc = 0; | |
1093 | int i; | |
1094 | unsigned long flags; | |
9637c3f3 | 1095 | mode_t mode; |
66a464db | 1096 | struct dentry *pde; |
1da177e4 LT |
1097 | |
1098 | if (!id) | |
1099 | goto out; | |
9637c3f3 MH |
1100 | mode = (id->mode | S_IFREG) & ~S_IXUGO; |
1101 | if (!(view->prolog_proc || view->format_proc || view->header_proc)) | |
1102 | mode &= ~(S_IRUSR | S_IRGRP | S_IROTH); | |
1103 | if (!view->input_proc) | |
1104 | mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH); | |
66a464db | 1105 | pde = debugfs_create_file(view->name, mode, id->debugfs_root_entry, |
942eaabd | 1106 | id , &debug_file_ops); |
1da177e4 | 1107 | if (!pde){ |
c5612c19 MH |
1108 | pr_err("Registering view %s/%s failed due to out of " |
1109 | "memory\n", id->name,view->name); | |
1da177e4 LT |
1110 | rc = -1; |
1111 | goto out; | |
1112 | } | |
1da177e4 LT |
1113 | spin_lock_irqsave(&id->lock, flags); |
1114 | for (i = 0; i < DEBUG_MAX_VIEWS; i++) { | |
66a464db | 1115 | if (!id->views[i]) |
1da177e4 LT |
1116 | break; |
1117 | } | |
1118 | if (i == DEBUG_MAX_VIEWS) { | |
c5612c19 MH |
1119 | pr_err("Registering view %s/%s would exceed the maximum " |
1120 | "number of views %i\n", id->name, view->name, i); | |
66a464db | 1121 | debugfs_remove(pde); |
1da177e4 | 1122 | rc = -1; |
66a464db | 1123 | } else { |
1da177e4 | 1124 | id->views[i] = view; |
66a464db | 1125 | id->debugfs_entries[i] = pde; |
1da177e4 LT |
1126 | } |
1127 | spin_unlock_irqrestore(&id->lock, flags); | |
66a464db | 1128 | out: |
1da177e4 LT |
1129 | return rc; |
1130 | } | |
1131 | ||
1132 | /* | |
1133 | * debug_unregister_view: | |
1134 | */ | |
1135 | ||
66a464db MH |
1136 | int |
1137 | debug_unregister_view(debug_info_t * id, struct debug_view *view) | |
1da177e4 LT |
1138 | { |
1139 | int rc = 0; | |
1140 | int i; | |
1141 | unsigned long flags; | |
1142 | ||
1143 | if (!id) | |
1144 | goto out; | |
1145 | spin_lock_irqsave(&id->lock, flags); | |
1146 | for (i = 0; i < DEBUG_MAX_VIEWS; i++) { | |
1147 | if (id->views[i] == view) | |
1148 | break; | |
1149 | } | |
1150 | if (i == DEBUG_MAX_VIEWS) | |
1151 | rc = -1; | |
1152 | else { | |
66a464db | 1153 | debugfs_remove(id->debugfs_entries[i]); |
1da177e4 | 1154 | id->views[i] = NULL; |
1da177e4 LT |
1155 | } |
1156 | spin_unlock_irqrestore(&id->lock, flags); | |
66a464db MH |
1157 | out: |
1158 | return rc; | |
1159 | } | |
1160 | ||
1161 | static inline char * | |
1162 | debug_get_user_string(const char __user *user_buf, size_t user_len) | |
1163 | { | |
1164 | char* buffer; | |
1165 | ||
1166 | buffer = kmalloc(user_len + 1, GFP_KERNEL); | |
1167 | if (!buffer) | |
1168 | return ERR_PTR(-ENOMEM); | |
1169 | if (copy_from_user(buffer, user_buf, user_len) != 0) { | |
1170 | kfree(buffer); | |
1171 | return ERR_PTR(-EFAULT); | |
1172 | } | |
1173 | /* got the string, now strip linefeed. */ | |
1174 | if (buffer[user_len - 1] == '\n') | |
1175 | buffer[user_len - 1] = 0; | |
1176 | else | |
1177 | buffer[user_len] = 0; | |
1178 | return buffer; | |
1179 | } | |
1180 | ||
1181 | static inline int | |
1182 | debug_get_uint(char *buf) | |
1183 | { | |
1184 | int rc; | |
1185 | ||
1186 | for(; isspace(*buf); buf++); | |
1187 | rc = simple_strtoul(buf, &buf, 10); | |
1188 | if(*buf){ | |
66a464db MH |
1189 | rc = -EINVAL; |
1190 | } | |
1da177e4 LT |
1191 | return rc; |
1192 | } | |
1193 | ||
1194 | /* | |
1195 | * functions for debug-views | |
1196 | *********************************** | |
1197 | */ | |
1198 | ||
1199 | /* | |
1200 | * prints out actual debug level | |
1201 | */ | |
1202 | ||
66a464db MH |
1203 | static int |
1204 | debug_prolog_pages_fn(debug_info_t * id, | |
1da177e4 | 1205 | struct debug_view *view, char *out_buf) |
66a464db MH |
1206 | { |
1207 | return sprintf(out_buf, "%i\n", id->pages_per_area); | |
1208 | } | |
1209 | ||
1210 | /* | |
1211 | * reads new size (number of pages per debug area) | |
1212 | */ | |
1213 | ||
1214 | static int | |
1215 | debug_input_pages_fn(debug_info_t * id, struct debug_view *view, | |
1216 | struct file *file, const char __user *user_buf, | |
1217 | size_t user_len, loff_t * offset) | |
1218 | { | |
1219 | char *str; | |
1220 | int rc,new_pages; | |
1221 | ||
1222 | if (user_len > 0x10000) | |
1223 | user_len = 0x10000; | |
1224 | if (*offset != 0){ | |
1225 | rc = -EPIPE; | |
1226 | goto out; | |
1227 | } | |
1228 | str = debug_get_user_string(user_buf,user_len); | |
1229 | if(IS_ERR(str)){ | |
1230 | rc = PTR_ERR(str); | |
1231 | goto out; | |
1232 | } | |
1233 | new_pages = debug_get_uint(str); | |
1234 | if(new_pages < 0){ | |
1235 | rc = -EINVAL; | |
1236 | goto free_str; | |
1237 | } | |
1238 | rc = debug_set_size(id,id->nr_areas, new_pages); | |
1239 | if(rc != 0){ | |
1240 | rc = -EINVAL; | |
1241 | goto free_str; | |
1242 | } | |
1243 | rc = user_len; | |
1244 | free_str: | |
1245 | kfree(str); | |
1246 | out: | |
1247 | *offset += user_len; | |
1248 | return rc; /* number of input characters */ | |
1249 | } | |
1250 | ||
1251 | /* | |
1252 | * prints out actual debug level | |
1253 | */ | |
1254 | ||
1255 | static int | |
1256 | debug_prolog_level_fn(debug_info_t * id, struct debug_view *view, char *out_buf) | |
1da177e4 LT |
1257 | { |
1258 | int rc = 0; | |
1259 | ||
66a464db MH |
1260 | if(id->level == DEBUG_OFF_LEVEL) { |
1261 | rc = sprintf(out_buf,"-\n"); | |
1262 | } | |
1263 | else { | |
1264 | rc = sprintf(out_buf, "%i\n", id->level); | |
1265 | } | |
1da177e4 LT |
1266 | return rc; |
1267 | } | |
1268 | ||
1269 | /* | |
1270 | * reads new debug level | |
1271 | */ | |
1272 | ||
66a464db MH |
1273 | static int |
1274 | debug_input_level_fn(debug_info_t * id, struct debug_view *view, | |
1275 | struct file *file, const char __user *user_buf, | |
1276 | size_t user_len, loff_t * offset) | |
1da177e4 | 1277 | { |
66a464db MH |
1278 | char *str; |
1279 | int rc,new_level; | |
1da177e4 | 1280 | |
66a464db MH |
1281 | if (user_len > 0x10000) |
1282 | user_len = 0x10000; | |
1283 | if (*offset != 0){ | |
1284 | rc = -EPIPE; | |
1da177e4 | 1285 | goto out; |
66a464db MH |
1286 | } |
1287 | str = debug_get_user_string(user_buf,user_len); | |
1288 | if(IS_ERR(str)){ | |
1289 | rc = PTR_ERR(str); | |
1da177e4 LT |
1290 | goto out; |
1291 | } | |
66a464db | 1292 | if(str[0] == '-'){ |
1da177e4 | 1293 | debug_set_level(id, DEBUG_OFF_LEVEL); |
66a464db MH |
1294 | rc = user_len; |
1295 | goto free_str; | |
1da177e4 | 1296 | } else { |
66a464db | 1297 | new_level = debug_get_uint(str); |
1da177e4 | 1298 | } |
66a464db | 1299 | if(new_level < 0) { |
c5612c19 MH |
1300 | pr_warning("%s is not a valid level for a debug " |
1301 | "feature\n", str); | |
66a464db MH |
1302 | rc = -EINVAL; |
1303 | } else { | |
1304 | debug_set_level(id, new_level); | |
1305 | rc = user_len; | |
1306 | } | |
1307 | free_str: | |
1308 | kfree(str); | |
1309 | out: | |
1310 | *offset += user_len; | |
1da177e4 LT |
1311 | return rc; /* number of input characters */ |
1312 | } | |
1313 | ||
1314 | ||
1315 | /* | |
1316 | * flushes debug areas | |
1317 | */ | |
1318 | ||
2b67fc46 | 1319 | static void debug_flush(debug_info_t* id, int area) |
1da177e4 LT |
1320 | { |
1321 | unsigned long flags; | |
66a464db | 1322 | int i,j; |
1da177e4 | 1323 | |
66a464db | 1324 | if(!id || !id->areas) |
1da177e4 LT |
1325 | return; |
1326 | spin_lock_irqsave(&id->lock,flags); | |
1327 | if(area == DEBUG_FLUSH_ALL){ | |
1328 | id->active_area = 0; | |
66a464db MH |
1329 | memset(id->active_entries, 0, id->nr_areas * sizeof(int)); |
1330 | for (i = 0; i < id->nr_areas; i++) { | |
1331 | id->active_pages[i] = 0; | |
1332 | for(j = 0; j < id->pages_per_area; j++) { | |
1333 | memset(id->areas[i][j], 0, PAGE_SIZE); | |
1334 | } | |
1335 | } | |
1da177e4 | 1336 | } else if(area >= 0 && area < id->nr_areas) { |
66a464db MH |
1337 | id->active_entries[area] = 0; |
1338 | id->active_pages[area] = 0; | |
1339 | for(i = 0; i < id->pages_per_area; i++) { | |
1340 | memset(id->areas[area][i],0,PAGE_SIZE); | |
1341 | } | |
1da177e4 LT |
1342 | } |
1343 | spin_unlock_irqrestore(&id->lock,flags); | |
1344 | } | |
1345 | ||
1346 | /* | |
1347 | * view function: flushes debug areas | |
1348 | */ | |
1349 | ||
66a464db MH |
1350 | static int |
1351 | debug_input_flush_fn(debug_info_t * id, struct debug_view *view, | |
1352 | struct file *file, const char __user *user_buf, | |
1353 | size_t user_len, loff_t * offset) | |
1da177e4 LT |
1354 | { |
1355 | char input_buf[1]; | |
66a464db MH |
1356 | int rc = user_len; |
1357 | ||
1358 | if (user_len > 0x10000) | |
1359 | user_len = 0x10000; | |
1360 | if (*offset != 0){ | |
1361 | rc = -EPIPE; | |
1da177e4 | 1362 | goto out; |
66a464db | 1363 | } |
1da177e4 LT |
1364 | if (copy_from_user(input_buf, user_buf, 1)){ |
1365 | rc = -EFAULT; | |
1366 | goto out; | |
1367 | } | |
1368 | if(input_buf[0] == '-') { | |
1369 | debug_flush(id, DEBUG_FLUSH_ALL); | |
1370 | goto out; | |
1371 | } | |
1372 | if (isdigit(input_buf[0])) { | |
1373 | int area = ((int) input_buf[0] - (int) '0'); | |
1374 | debug_flush(id, area); | |
1375 | goto out; | |
1376 | } | |
1377 | ||
c5612c19 MH |
1378 | pr_info("Flushing debug data failed because %c is not a valid " |
1379 | "area\n", input_buf[0]); | |
1da177e4 | 1380 | |
66a464db MH |
1381 | out: |
1382 | *offset += user_len; | |
1da177e4 LT |
1383 | return rc; /* number of input characters */ |
1384 | } | |
1385 | ||
1386 | /* | |
1387 | * prints debug header in raw format | |
1388 | */ | |
1389 | ||
66a464db MH |
1390 | static int |
1391 | debug_raw_header_fn(debug_info_t * id, struct debug_view *view, | |
1392 | int area, debug_entry_t * entry, char *out_buf) | |
1da177e4 LT |
1393 | { |
1394 | int rc; | |
1395 | ||
1396 | rc = sizeof(debug_entry_t); | |
1397 | memcpy(out_buf,entry,sizeof(debug_entry_t)); | |
1398 | return rc; | |
1399 | } | |
1400 | ||
1401 | /* | |
1402 | * prints debug data in raw format | |
1403 | */ | |
1404 | ||
66a464db MH |
1405 | static int |
1406 | debug_raw_format_fn(debug_info_t * id, struct debug_view *view, | |
1da177e4 LT |
1407 | char *out_buf, const char *in_buf) |
1408 | { | |
1409 | int rc; | |
1410 | ||
1411 | rc = id->buf_size; | |
1412 | memcpy(out_buf, in_buf, id->buf_size); | |
1413 | return rc; | |
1414 | } | |
1415 | ||
1416 | /* | |
1417 | * prints debug data in hex/ascii format | |
1418 | */ | |
1419 | ||
66a464db MH |
1420 | static int |
1421 | debug_hex_ascii_format_fn(debug_info_t * id, struct debug_view *view, | |
1422 | char *out_buf, const char *in_buf) | |
1da177e4 LT |
1423 | { |
1424 | int i, rc = 0; | |
1425 | ||
1426 | for (i = 0; i < id->buf_size; i++) { | |
1427 | rc += sprintf(out_buf + rc, "%02x ", | |
1428 | ((unsigned char *) in_buf)[i]); | |
1429 | } | |
1430 | rc += sprintf(out_buf + rc, "| "); | |
1431 | for (i = 0; i < id->buf_size; i++) { | |
1432 | unsigned char c = in_buf[i]; | |
1433 | if (!isprint(c)) | |
1434 | rc += sprintf(out_buf + rc, "."); | |
1435 | else | |
1436 | rc += sprintf(out_buf + rc, "%c", c); | |
1437 | } | |
1438 | rc += sprintf(out_buf + rc, "\n"); | |
1439 | return rc; | |
1440 | } | |
1441 | ||
1442 | /* | |
1443 | * prints header for debug entry | |
1444 | */ | |
1445 | ||
66a464db MH |
1446 | int |
1447 | debug_dflt_header_fn(debug_info_t * id, struct debug_view *view, | |
1da177e4 LT |
1448 | int area, debug_entry_t * entry, char *out_buf) |
1449 | { | |
942eaabd | 1450 | struct timespec time_spec; |
1da177e4 LT |
1451 | char *except_str; |
1452 | unsigned long caller; | |
1453 | int rc = 0; | |
1454 | unsigned int level; | |
1455 | ||
1456 | level = entry->id.fields.level; | |
b592e89a | 1457 | stck_to_timespec(entry->id.stck, &time_spec); |
1da177e4 LT |
1458 | |
1459 | if (entry->id.fields.exception) | |
1460 | except_str = "*"; | |
1461 | else | |
1462 | except_str = "-"; | |
1463 | caller = ((unsigned long) entry->caller) & PSW_ADDR_INSN; | |
1464 | rc += sprintf(out_buf, "%02i %011lu:%06lu %1u %1s %02i %p ", | |
942eaabd | 1465 | area, time_spec.tv_sec, time_spec.tv_nsec / 1000, level, |
1da177e4 LT |
1466 | except_str, entry->id.fields.cpuid, (void *) caller); |
1467 | return rc; | |
1468 | } | |
1469 | ||
1470 | /* | |
1471 | * prints debug data sprintf-formated: | |
1472 | * debug_sprinf_event/exception calls must be used together with this view | |
1473 | */ | |
1474 | ||
1475 | #define DEBUG_SPRINTF_MAX_ARGS 10 | |
1476 | ||
66a464db MH |
1477 | static int |
1478 | debug_sprintf_format_fn(debug_info_t * id, struct debug_view *view, | |
1479 | char *out_buf, debug_sprintf_entry_t *curr_event) | |
1da177e4 LT |
1480 | { |
1481 | int num_longs, num_used_args = 0,i, rc = 0; | |
1482 | int index[DEBUG_SPRINTF_MAX_ARGS]; | |
1483 | ||
1484 | /* count of longs fit into one entry */ | |
1485 | num_longs = id->buf_size / sizeof(long); | |
1486 | ||
1487 | if(num_longs < 1) | |
1488 | goto out; /* bufsize of entry too small */ | |
1489 | if(num_longs == 1) { | |
1490 | /* no args, we use only the string */ | |
1491 | strcpy(out_buf, curr_event->string); | |
1492 | rc = strlen(curr_event->string); | |
1493 | goto out; | |
1494 | } | |
1495 | ||
1496 | /* number of arguments used for sprintf (without the format string) */ | |
1497 | num_used_args = min(DEBUG_SPRINTF_MAX_ARGS, (num_longs - 1)); | |
1498 | ||
1499 | memset(index,0, DEBUG_SPRINTF_MAX_ARGS * sizeof(int)); | |
1500 | ||
1501 | for(i = 0; i < num_used_args; i++) | |
1502 | index[i] = i; | |
1503 | ||
1504 | rc = sprintf(out_buf, curr_event->string, curr_event->args[index[0]], | |
1505 | curr_event->args[index[1]], curr_event->args[index[2]], | |
1506 | curr_event->args[index[3]], curr_event->args[index[4]], | |
1507 | curr_event->args[index[5]], curr_event->args[index[6]], | |
1508 | curr_event->args[index[7]], curr_event->args[index[8]], | |
1509 | curr_event->args[index[9]]); | |
1510 | ||
1511 | out: | |
1512 | ||
1513 | return rc; | |
1514 | } | |
1515 | ||
1516 | /* | |
1517 | * clean up module | |
1518 | */ | |
2b67fc46 | 1519 | static void __exit debug_exit(void) |
1da177e4 | 1520 | { |
66a464db | 1521 | debugfs_remove(debug_debugfs_root_entry); |
1da177e4 LT |
1522 | unregister_sysctl_table(s390dbf_sysctl_header); |
1523 | return; | |
1524 | } | |
1525 | ||
1526 | /* | |
1527 | * module definitions | |
1528 | */ | |
66a464db | 1529 | postcore_initcall(debug_init); |
1da177e4 LT |
1530 | module_exit(debug_exit); |
1531 | MODULE_LICENSE("GPL"); | |
1532 | ||
1533 | EXPORT_SYMBOL(debug_register); | |
1534 | EXPORT_SYMBOL(debug_unregister); | |
1535 | EXPORT_SYMBOL(debug_set_level); | |
1536 | EXPORT_SYMBOL(debug_stop_all); | |
1537 | EXPORT_SYMBOL(debug_register_view); | |
1538 | EXPORT_SYMBOL(debug_unregister_view); | |
1539 | EXPORT_SYMBOL(debug_event_common); | |
1540 | EXPORT_SYMBOL(debug_exception_common); | |
1541 | EXPORT_SYMBOL(debug_hex_ascii_view); | |
1542 | EXPORT_SYMBOL(debug_raw_view); | |
1543 | EXPORT_SYMBOL(debug_dflt_header_fn); | |
1544 | EXPORT_SYMBOL(debug_sprintf_view); | |
1545 | EXPORT_SYMBOL(debug_sprintf_exception); | |
1546 | EXPORT_SYMBOL(debug_sprintf_event); |