Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
2 | * S/390 debug facility |
3 | * | |
3ab121ab MH |
4 | * Copyright IBM Corp. 1999, 2012 |
5 | * | |
1da177e4 LT |
6 | * Author(s): Michael Holzheu (holzheu@de.ibm.com), |
7 | * Holger Smolinski (Holger.Smolinski@de.ibm.com) | |
8 | * | |
9 | * Bugreports to: <Linux390@de.ibm.com> | |
10 | */ | |
11 | ||
c5612c19 MH |
12 | #define KMSG_COMPONENT "s390dbf" |
13 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
14 | ||
1da177e4 LT |
15 | #include <linux/stddef.h> |
16 | #include <linux/kernel.h> | |
17 | #include <linux/errno.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/ctype.h> | |
e7d2860b | 20 | #include <linux/string.h> |
1da177e4 LT |
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, |
f4ae40a6 | 76 | int nr_areas, int buf_size, umode_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 | }; | |
d5274369 | 113 | EXPORT_SYMBOL(debug_raw_view); |
1da177e4 LT |
114 | |
115 | struct debug_view debug_hex_ascii_view = { | |
116 | "hex_ascii", | |
117 | NULL, | |
118 | &debug_dflt_header_fn, | |
119 | &debug_hex_ascii_format_fn, | |
120 | NULL, | |
121 | NULL | |
122 | }; | |
d5274369 | 123 | EXPORT_SYMBOL(debug_hex_ascii_view); |
1da177e4 | 124 | |
2b67fc46 | 125 | static struct debug_view debug_level_view = { |
1da177e4 LT |
126 | "level", |
127 | &debug_prolog_level_fn, | |
128 | NULL, | |
129 | NULL, | |
130 | &debug_input_level_fn, | |
131 | NULL | |
132 | }; | |
133 | ||
2b67fc46 | 134 | static struct debug_view debug_pages_view = { |
66a464db MH |
135 | "pages", |
136 | &debug_prolog_pages_fn, | |
137 | NULL, | |
138 | NULL, | |
139 | &debug_input_pages_fn, | |
140 | NULL | |
141 | }; | |
142 | ||
2b67fc46 | 143 | static struct debug_view debug_flush_view = { |
1da177e4 LT |
144 | "flush", |
145 | NULL, | |
146 | NULL, | |
147 | NULL, | |
148 | &debug_input_flush_fn, | |
149 | NULL | |
150 | }; | |
151 | ||
152 | struct debug_view debug_sprintf_view = { | |
153 | "sprintf", | |
154 | NULL, | |
155 | &debug_dflt_header_fn, | |
156 | (debug_format_proc_t*)&debug_sprintf_format_fn, | |
157 | NULL, | |
158 | NULL | |
159 | }; | |
d5274369 | 160 | EXPORT_SYMBOL(debug_sprintf_view); |
1da177e4 | 161 | |
2b67fc46 | 162 | /* used by dump analysis tools to determine version of debug feature */ |
a806170e | 163 | static unsigned int __used debug_feature_version = __DEBUG_FEATURE_VERSION; |
1da177e4 LT |
164 | |
165 | /* static globals */ | |
166 | ||
167 | static debug_info_t *debug_area_first = NULL; | |
168 | static debug_info_t *debug_area_last = NULL; | |
e11f0d04 | 169 | static DEFINE_MUTEX(debug_mutex); |
1da177e4 LT |
170 | |
171 | static int initialized; | |
3ab121ab | 172 | static int debug_critical; |
1da177e4 | 173 | |
5dfe4c96 | 174 | static const struct file_operations debug_file_ops = { |
66a464db | 175 | .owner = THIS_MODULE, |
1da177e4 | 176 | .read = debug_output, |
66a464db | 177 | .write = debug_input, |
1da177e4 LT |
178 | .open = debug_open, |
179 | .release = debug_close, | |
6038f373 | 180 | .llseek = no_llseek, |
1da177e4 LT |
181 | }; |
182 | ||
66a464db | 183 | static struct dentry *debug_debugfs_root_entry; |
1da177e4 LT |
184 | |
185 | /* functions */ | |
186 | ||
66a464db MH |
187 | /* |
188 | * debug_areas_alloc | |
189 | * - Debug areas are implemented as a threedimensonal array: | |
190 | * areas[areanumber][pagenumber][pageoffset] | |
191 | */ | |
192 | ||
193 | static debug_entry_t*** | |
194 | debug_areas_alloc(int pages_per_area, int nr_areas) | |
195 | { | |
196 | debug_entry_t*** areas; | |
197 | int i,j; | |
198 | ||
5cbded58 | 199 | areas = kmalloc(nr_areas * |
66a464db MH |
200 | sizeof(debug_entry_t**), |
201 | GFP_KERNEL); | |
202 | if (!areas) | |
203 | goto fail_malloc_areas; | |
204 | for (i = 0; i < nr_areas; i++) { | |
5cbded58 | 205 | areas[i] = kmalloc(pages_per_area * |
66a464db MH |
206 | sizeof(debug_entry_t*),GFP_KERNEL); |
207 | if (!areas[i]) { | |
208 | goto fail_malloc_areas2; | |
209 | } | |
210 | for(j = 0; j < pages_per_area; j++) { | |
fb630517 | 211 | areas[i][j] = kzalloc(PAGE_SIZE, GFP_KERNEL); |
66a464db MH |
212 | if(!areas[i][j]) { |
213 | for(j--; j >=0 ; j--) { | |
214 | kfree(areas[i][j]); | |
215 | } | |
216 | kfree(areas[i]); | |
217 | goto fail_malloc_areas2; | |
66a464db MH |
218 | } |
219 | } | |
220 | } | |
221 | return areas; | |
222 | ||
223 | fail_malloc_areas2: | |
224 | for(i--; i >= 0; i--){ | |
225 | for(j=0; j < pages_per_area;j++){ | |
226 | kfree(areas[i][j]); | |
227 | } | |
228 | kfree(areas[i]); | |
229 | } | |
230 | kfree(areas); | |
231 | fail_malloc_areas: | |
232 | return NULL; | |
233 | ||
234 | } | |
235 | ||
236 | ||
1da177e4 LT |
237 | /* |
238 | * debug_info_alloc | |
239 | * - alloc new debug-info | |
240 | */ | |
241 | ||
66a464db | 242 | static debug_info_t* |
5cbbf16a CH |
243 | debug_info_alloc(const char *name, int pages_per_area, int nr_areas, |
244 | int buf_size, int level, int mode) | |
1da177e4 LT |
245 | { |
246 | debug_info_t* rc; | |
1da177e4 LT |
247 | |
248 | /* alloc everything */ | |
249 | ||
5cbded58 | 250 | rc = kmalloc(sizeof(debug_info_t), GFP_KERNEL); |
1da177e4 LT |
251 | if(!rc) |
252 | goto fail_malloc_rc; | |
fb630517 | 253 | rc->active_entries = kcalloc(nr_areas, sizeof(int), GFP_KERNEL); |
66a464db MH |
254 | if(!rc->active_entries) |
255 | goto fail_malloc_active_entries; | |
fb630517 | 256 | rc->active_pages = kcalloc(nr_areas, sizeof(int), GFP_KERNEL); |
66a464db MH |
257 | if(!rc->active_pages) |
258 | goto fail_malloc_active_pages; | |
66a464db MH |
259 | if((mode == ALL_AREAS) && (pages_per_area != 0)){ |
260 | rc->areas = debug_areas_alloc(pages_per_area, nr_areas); | |
261 | if(!rc->areas) | |
262 | goto fail_malloc_areas; | |
263 | } else { | |
264 | rc->areas = NULL; | |
1da177e4 LT |
265 | } |
266 | ||
267 | /* initialize members */ | |
268 | ||
269 | spin_lock_init(&rc->lock); | |
66a464db MH |
270 | rc->pages_per_area = pages_per_area; |
271 | rc->nr_areas = nr_areas; | |
272 | rc->active_area = 0; | |
273 | rc->level = level; | |
274 | rc->buf_size = buf_size; | |
275 | rc->entry_size = sizeof(debug_entry_t) + buf_size; | |
20cb9e79 | 276 | strlcpy(rc->name, name, sizeof(rc->name)); |
1da177e4 | 277 | memset(rc->views, 0, DEBUG_MAX_VIEWS * sizeof(struct debug_view *)); |
66a464db MH |
278 | memset(rc->debugfs_entries, 0 ,DEBUG_MAX_VIEWS * |
279 | sizeof(struct dentry*)); | |
1da177e4 LT |
280 | atomic_set(&(rc->ref_count), 0); |
281 | ||
282 | return rc; | |
283 | ||
1da177e4 | 284 | fail_malloc_areas: |
66a464db MH |
285 | kfree(rc->active_pages); |
286 | fail_malloc_active_pages: | |
287 | kfree(rc->active_entries); | |
288 | fail_malloc_active_entries: | |
1da177e4 LT |
289 | kfree(rc); |
290 | fail_malloc_rc: | |
291 | return NULL; | |
292 | } | |
293 | ||
294 | /* | |
66a464db MH |
295 | * debug_areas_free |
296 | * - free all debug areas | |
1da177e4 LT |
297 | */ |
298 | ||
66a464db MH |
299 | static void |
300 | debug_areas_free(debug_info_t* db_info) | |
301 | { | |
302 | int i,j; | |
303 | ||
304 | if(!db_info->areas) | |
305 | return; | |
1da177e4 | 306 | for (i = 0; i < db_info->nr_areas; i++) { |
66a464db MH |
307 | for(j = 0; j < db_info->pages_per_area; j++) { |
308 | kfree(db_info->areas[i][j]); | |
309 | } | |
310 | kfree(db_info->areas[i]); | |
1da177e4 LT |
311 | } |
312 | kfree(db_info->areas); | |
66a464db MH |
313 | db_info->areas = NULL; |
314 | } | |
315 | ||
316 | /* | |
317 | * debug_info_free | |
318 | * - free memory debug-info | |
319 | */ | |
320 | ||
321 | static void | |
322 | debug_info_free(debug_info_t* db_info){ | |
323 | debug_areas_free(db_info); | |
324 | kfree(db_info->active_entries); | |
325 | kfree(db_info->active_pages); | |
1da177e4 LT |
326 | kfree(db_info); |
327 | } | |
328 | ||
329 | /* | |
330 | * debug_info_create | |
331 | * - create new debug-info | |
332 | */ | |
333 | ||
66a464db | 334 | static debug_info_t* |
5cbbf16a | 335 | debug_info_create(const char *name, int pages_per_area, int nr_areas, |
f4ae40a6 | 336 | int buf_size, umode_t mode) |
1da177e4 LT |
337 | { |
338 | debug_info_t* rc; | |
339 | ||
66a464db MH |
340 | rc = debug_info_alloc(name, pages_per_area, nr_areas, buf_size, |
341 | DEBUG_DEFAULT_LEVEL, ALL_AREAS); | |
1da177e4 LT |
342 | if(!rc) |
343 | goto out; | |
344 | ||
9637c3f3 MH |
345 | rc->mode = mode & ~S_IFMT; |
346 | ||
66a464db MH |
347 | /* create root directory */ |
348 | rc->debugfs_root_entry = debugfs_create_dir(rc->name, | |
349 | debug_debugfs_root_entry); | |
1da177e4 LT |
350 | |
351 | /* append new element to linked list */ | |
66a464db | 352 | if (!debug_area_first) { |
1da177e4 LT |
353 | /* first element in list */ |
354 | debug_area_first = rc; | |
355 | rc->prev = NULL; | |
356 | } else { | |
357 | /* append element to end of list */ | |
358 | debug_area_last->next = rc; | |
359 | rc->prev = debug_area_last; | |
360 | } | |
361 | debug_area_last = rc; | |
362 | rc->next = NULL; | |
363 | ||
364 | debug_info_get(rc); | |
365 | out: | |
366 | return rc; | |
367 | } | |
368 | ||
369 | /* | |
370 | * debug_info_copy | |
371 | * - copy debug-info | |
372 | */ | |
373 | ||
66a464db MH |
374 | static debug_info_t* |
375 | debug_info_copy(debug_info_t* in, int mode) | |
1da177e4 | 376 | { |
66a464db | 377 | int i,j; |
1da177e4 | 378 | debug_info_t* rc; |
942eaabd MH |
379 | unsigned long flags; |
380 | ||
381 | /* get a consistent copy of the debug areas */ | |
382 | do { | |
383 | rc = debug_info_alloc(in->name, in->pages_per_area, | |
384 | in->nr_areas, in->buf_size, in->level, mode); | |
385 | spin_lock_irqsave(&in->lock, flags); | |
386 | if(!rc) | |
387 | goto out; | |
388 | /* has something changed in the meantime ? */ | |
389 | if((rc->pages_per_area == in->pages_per_area) && | |
390 | (rc->nr_areas == in->nr_areas)) { | |
391 | break; | |
392 | } | |
393 | spin_unlock_irqrestore(&in->lock, flags); | |
394 | debug_info_free(rc); | |
395 | } while (1); | |
66a464db | 396 | |
acfa922c | 397 | if (mode == NO_AREAS) |
1da177e4 LT |
398 | goto out; |
399 | ||
400 | for(i = 0; i < in->nr_areas; i++){ | |
66a464db MH |
401 | for(j = 0; j < in->pages_per_area; j++) { |
402 | memcpy(rc->areas[i][j], in->areas[i][j],PAGE_SIZE); | |
403 | } | |
1da177e4 LT |
404 | } |
405 | out: | |
942eaabd | 406 | spin_unlock_irqrestore(&in->lock, flags); |
1da177e4 LT |
407 | return rc; |
408 | } | |
409 | ||
410 | /* | |
411 | * debug_info_get | |
412 | * - increments reference count for debug-info | |
413 | */ | |
414 | ||
66a464db MH |
415 | static void |
416 | debug_info_get(debug_info_t * db_info) | |
1da177e4 LT |
417 | { |
418 | if (db_info) | |
419 | atomic_inc(&db_info->ref_count); | |
420 | } | |
421 | ||
422 | /* | |
423 | * debug_info_put: | |
424 | * - decreases reference count for debug-info and frees it if necessary | |
425 | */ | |
426 | ||
66a464db MH |
427 | static void |
428 | debug_info_put(debug_info_t *db_info) | |
1da177e4 LT |
429 | { |
430 | int i; | |
431 | ||
432 | if (!db_info) | |
433 | return; | |
434 | if (atomic_dec_and_test(&db_info->ref_count)) { | |
1da177e4 | 435 | for (i = 0; i < DEBUG_MAX_VIEWS; i++) { |
66a464db | 436 | if (!db_info->views[i]) |
1da177e4 | 437 | continue; |
66a464db | 438 | debugfs_remove(db_info->debugfs_entries[i]); |
1da177e4 | 439 | } |
66a464db | 440 | debugfs_remove(db_info->debugfs_root_entry); |
1da177e4 LT |
441 | if(db_info == debug_area_first) |
442 | debug_area_first = db_info->next; | |
443 | if(db_info == debug_area_last) | |
444 | debug_area_last = db_info->prev; | |
445 | if(db_info->prev) db_info->prev->next = db_info->next; | |
446 | if(db_info->next) db_info->next->prev = db_info->prev; | |
447 | debug_info_free(db_info); | |
448 | } | |
449 | } | |
450 | ||
451 | /* | |
452 | * debug_format_entry: | |
453 | * - format one debug entry and return size of formated data | |
454 | */ | |
455 | ||
66a464db MH |
456 | static int |
457 | debug_format_entry(file_private_info_t *p_info) | |
1da177e4 | 458 | { |
1da177e4 LT |
459 | debug_info_t *id_snap = p_info->debug_info_snap; |
460 | struct debug_view *view = p_info->view; | |
461 | debug_entry_t *act_entry; | |
462 | size_t len = 0; | |
463 | if(p_info->act_entry == DEBUG_PROLOG_ENTRY){ | |
464 | /* print prolog */ | |
465 | if (view->prolog_proc) | |
66a464db | 466 | len += view->prolog_proc(id_snap,view,p_info->temp_buf); |
1da177e4 LT |
467 | goto out; |
468 | } | |
66a464db MH |
469 | if (!id_snap->areas) /* this is true, if we have a prolog only view */ |
470 | goto out; /* or if 'pages_per_area' is 0 */ | |
471 | act_entry = (debug_entry_t *) ((char*)id_snap->areas[p_info->act_area] | |
472 | [p_info->act_page] + p_info->act_entry); | |
1da177e4 LT |
473 | |
474 | if (act_entry->id.stck == 0LL) | |
475 | goto out; /* empty entry */ | |
476 | if (view->header_proc) | |
66a464db | 477 | len += view->header_proc(id_snap, view, p_info->act_area, |
1da177e4 LT |
478 | act_entry, p_info->temp_buf + len); |
479 | if (view->format_proc) | |
66a464db | 480 | len += view->format_proc(id_snap, view, p_info->temp_buf + len, |
1da177e4 | 481 | DEBUG_DATA(act_entry)); |
66a464db | 482 | out: |
1da177e4 LT |
483 | return len; |
484 | } | |
485 | ||
486 | /* | |
487 | * debug_next_entry: | |
488 | * - goto next entry in p_info | |
489 | */ | |
490 | ||
4448aaf0 | 491 | static inline int |
66a464db | 492 | debug_next_entry(file_private_info_t *p_info) |
1da177e4 | 493 | { |
66a464db MH |
494 | debug_info_t *id; |
495 | ||
496 | id = p_info->debug_info_snap; | |
1da177e4 LT |
497 | if(p_info->act_entry == DEBUG_PROLOG_ENTRY){ |
498 | p_info->act_entry = 0; | |
66a464db | 499 | p_info->act_page = 0; |
1da177e4 LT |
500 | goto out; |
501 | } | |
66a464db MH |
502 | if(!id->areas) |
503 | return 1; | |
504 | p_info->act_entry += id->entry_size; | |
505 | /* switch to next page, if we reached the end of the page */ | |
506 | if (p_info->act_entry > (PAGE_SIZE - id->entry_size)){ | |
507 | /* next page */ | |
1da177e4 | 508 | p_info->act_entry = 0; |
66a464db MH |
509 | p_info->act_page += 1; |
510 | if((p_info->act_page % id->pages_per_area) == 0) { | |
511 | /* next area */ | |
512 | p_info->act_area++; | |
513 | p_info->act_page=0; | |
514 | } | |
1da177e4 LT |
515 | if(p_info->act_area >= id->nr_areas) |
516 | return 1; | |
517 | } | |
518 | out: | |
519 | return 0; | |
520 | } | |
521 | ||
522 | /* | |
523 | * debug_output: | |
524 | * - called for user read() | |
525 | * - copies formated debug entries to the user buffer | |
526 | */ | |
527 | ||
66a464db MH |
528 | static ssize_t |
529 | debug_output(struct file *file, /* file descriptor */ | |
530 | char __user *user_buf, /* user buffer */ | |
531 | size_t len, /* length of buffer */ | |
532 | loff_t *offset) /* offset in the file */ | |
1da177e4 LT |
533 | { |
534 | size_t count = 0; | |
66a464db | 535 | size_t entry_offset; |
1da177e4 LT |
536 | file_private_info_t *p_info; |
537 | ||
538 | p_info = ((file_private_info_t *) file->private_data); | |
539 | if (*offset != p_info->offset) | |
540 | return -EPIPE; | |
541 | if(p_info->act_area >= p_info->debug_info_snap->nr_areas) | |
542 | return 0; | |
1da177e4 | 543 | entry_offset = p_info->act_entry_offset; |
1da177e4 | 544 | while(count < len){ |
66a464db MH |
545 | int formatted_line_size; |
546 | int formatted_line_residue; | |
547 | int user_buf_residue; | |
548 | size_t copy_size; | |
549 | ||
550 | formatted_line_size = debug_format_entry(p_info); | |
551 | formatted_line_residue = formatted_line_size - entry_offset; | |
552 | user_buf_residue = len-count; | |
553 | copy_size = min(user_buf_residue, formatted_line_residue); | |
554 | if(copy_size){ | |
555 | if (copy_to_user(user_buf + count, p_info->temp_buf | |
556 | + entry_offset, copy_size)) | |
557 | return -EFAULT; | |
558 | count += copy_size; | |
559 | entry_offset += copy_size; | |
1da177e4 | 560 | } |
66a464db MH |
561 | if(copy_size == formatted_line_residue){ |
562 | entry_offset = 0; | |
563 | if(debug_next_entry(p_info)) | |
1da177e4 | 564 | goto out; |
66a464db | 565 | } |
1da177e4 LT |
566 | } |
567 | out: | |
568 | p_info->offset = *offset + count; | |
66a464db | 569 | p_info->act_entry_offset = entry_offset; |
1da177e4 LT |
570 | *offset = p_info->offset; |
571 | return count; | |
572 | } | |
573 | ||
574 | /* | |
575 | * debug_input: | |
576 | * - called for user write() | |
577 | * - calls input function of view | |
578 | */ | |
579 | ||
66a464db MH |
580 | static ssize_t |
581 | debug_input(struct file *file, const char __user *user_buf, size_t length, | |
582 | loff_t *offset) | |
1da177e4 LT |
583 | { |
584 | int rc = 0; | |
585 | file_private_info_t *p_info; | |
586 | ||
e11f0d04 | 587 | mutex_lock(&debug_mutex); |
1da177e4 LT |
588 | p_info = ((file_private_info_t *) file->private_data); |
589 | if (p_info->view->input_proc) | |
590 | rc = p_info->view->input_proc(p_info->debug_info_org, | |
591 | p_info->view, file, user_buf, | |
592 | length, offset); | |
593 | else | |
594 | rc = -EPERM; | |
e11f0d04 | 595 | mutex_unlock(&debug_mutex); |
1da177e4 LT |
596 | return rc; /* number of input characters */ |
597 | } | |
598 | ||
599 | /* | |
600 | * debug_open: | |
601 | * - called for user open() | |
602 | * - copies formated output to private_data area of the file | |
603 | * handle | |
604 | */ | |
605 | ||
66a464db MH |
606 | static int |
607 | debug_open(struct inode *inode, struct file *file) | |
1da177e4 | 608 | { |
a0fa8e37 | 609 | int i, rc = 0; |
1da177e4 LT |
610 | file_private_info_t *p_info; |
611 | debug_info_t *debug_info, *debug_info_snapshot; | |
612 | ||
e11f0d04 | 613 | mutex_lock(&debug_mutex); |
496ad9aa | 614 | debug_info = file_inode(file)->i_private; |
942eaabd MH |
615 | /* find debug view */ |
616 | for (i = 0; i < DEBUG_MAX_VIEWS; i++) { | |
617 | if (!debug_info->views[i]) | |
618 | continue; | |
619 | else if (debug_info->debugfs_entries[i] == | |
d20343e7 | 620 | file->f_path.dentry) { |
942eaabd | 621 | goto found; /* found view ! */ |
1da177e4 | 622 | } |
1da177e4 LT |
623 | } |
624 | /* no entry found */ | |
625 | rc = -EINVAL; | |
626 | goto out; | |
627 | ||
66a464db | 628 | found: |
1da177e4 | 629 | |
66a464db MH |
630 | /* Make snapshot of current debug areas to get it consistent. */ |
631 | /* To copy all the areas is only needed, if we have a view which */ | |
632 | /* formats the debug areas. */ | |
1da177e4 | 633 | |
66a464db MH |
634 | if(!debug_info->views[i]->format_proc && |
635 | !debug_info->views[i]->header_proc){ | |
636 | debug_info_snapshot = debug_info_copy(debug_info, NO_AREAS); | |
637 | } else { | |
638 | debug_info_snapshot = debug_info_copy(debug_info, ALL_AREAS); | |
639 | } | |
1da177e4 LT |
640 | |
641 | if(!debug_info_snapshot){ | |
1da177e4 LT |
642 | rc = -ENOMEM; |
643 | goto out; | |
644 | } | |
5cbded58 | 645 | p_info = kmalloc(sizeof(file_private_info_t), |
66a464db MH |
646 | GFP_KERNEL); |
647 | if(!p_info){ | |
58ace9f2 | 648 | debug_info_free(debug_info_snapshot); |
1da177e4 LT |
649 | rc = -ENOMEM; |
650 | goto out; | |
651 | } | |
1da177e4 LT |
652 | p_info->offset = 0; |
653 | p_info->debug_info_snap = debug_info_snapshot; | |
654 | p_info->debug_info_org = debug_info; | |
655 | p_info->view = debug_info->views[i]; | |
656 | p_info->act_area = 0; | |
66a464db | 657 | p_info->act_page = 0; |
1da177e4 LT |
658 | p_info->act_entry = DEBUG_PROLOG_ENTRY; |
659 | p_info->act_entry_offset = 0; | |
66a464db | 660 | file->private_data = p_info; |
1da177e4 | 661 | debug_info_get(debug_info); |
58ea91c0 | 662 | nonseekable_open(inode, file); |
66a464db | 663 | out: |
e11f0d04 | 664 | mutex_unlock(&debug_mutex); |
1da177e4 LT |
665 | return rc; |
666 | } | |
667 | ||
668 | /* | |
669 | * debug_close: | |
670 | * - called for user close() | |
671 | * - deletes private_data area of the file handle | |
672 | */ | |
673 | ||
66a464db MH |
674 | static int |
675 | debug_close(struct inode *inode, struct file *file) | |
1da177e4 LT |
676 | { |
677 | file_private_info_t *p_info; | |
1da177e4 | 678 | p_info = (file_private_info_t *) file->private_data; |
66a464db MH |
679 | if(p_info->debug_info_snap) |
680 | debug_info_free(p_info->debug_info_snap); | |
1da177e4 LT |
681 | debug_info_put(p_info->debug_info_org); |
682 | kfree(file->private_data); | |
683 | return 0; /* success */ | |
684 | } | |
685 | ||
686 | /* | |
9637c3f3 MH |
687 | * debug_register_mode: |
688 | * - Creates and initializes debug area for the caller | |
689 | * The mode parameter allows to specify access rights for the s390dbf files | |
690 | * - Returns handle for debug area | |
1da177e4 LT |
691 | */ |
692 | ||
5cbbf16a | 693 | debug_info_t *debug_register_mode(const char *name, int pages_per_area, |
f4ae40a6 | 694 | int nr_areas, int buf_size, umode_t mode, |
5cbbf16a | 695 | uid_t uid, gid_t gid) |
1da177e4 LT |
696 | { |
697 | debug_info_t *rc = NULL; | |
698 | ||
9637c3f3 MH |
699 | /* Since debugfs currently does not support uid/gid other than root, */ |
700 | /* we do not allow gid/uid != 0 until we get support for that. */ | |
701 | if ((uid != 0) || (gid != 0)) | |
c5612c19 MH |
702 | pr_warning("Root becomes the owner of all s390dbf files " |
703 | "in sysfs\n"); | |
6aa0d3a9 | 704 | BUG_ON(!initialized); |
e11f0d04 | 705 | mutex_lock(&debug_mutex); |
1da177e4 LT |
706 | |
707 | /* create new debug_info */ | |
708 | ||
9637c3f3 | 709 | rc = debug_info_create(name, pages_per_area, nr_areas, buf_size, mode); |
1da177e4 LT |
710 | if(!rc) |
711 | goto out; | |
712 | debug_register_view(rc, &debug_level_view); | |
713 | debug_register_view(rc, &debug_flush_view); | |
66a464db MH |
714 | debug_register_view(rc, &debug_pages_view); |
715 | out: | |
716 | if (!rc){ | |
c5612c19 | 717 | pr_err("Registering debug feature %s failed\n", name); |
1da177e4 | 718 | } |
e11f0d04 | 719 | mutex_unlock(&debug_mutex); |
1da177e4 LT |
720 | return rc; |
721 | } | |
9637c3f3 MH |
722 | EXPORT_SYMBOL(debug_register_mode); |
723 | ||
724 | /* | |
725 | * debug_register: | |
726 | * - creates and initializes debug area for the caller | |
727 | * - returns handle for debug area | |
728 | */ | |
729 | ||
5cbbf16a CH |
730 | debug_info_t *debug_register(const char *name, int pages_per_area, |
731 | int nr_areas, int buf_size) | |
9637c3f3 MH |
732 | { |
733 | return debug_register_mode(name, pages_per_area, nr_areas, buf_size, | |
734 | S_IRUSR | S_IWUSR, 0, 0); | |
735 | } | |
d5274369 | 736 | EXPORT_SYMBOL(debug_register); |
1da177e4 LT |
737 | |
738 | /* | |
739 | * debug_unregister: | |
740 | * - give back debug area | |
741 | */ | |
742 | ||
66a464db MH |
743 | void |
744 | debug_unregister(debug_info_t * id) | |
1da177e4 LT |
745 | { |
746 | if (!id) | |
747 | goto out; | |
e11f0d04 | 748 | mutex_lock(&debug_mutex); |
1da177e4 | 749 | debug_info_put(id); |
e11f0d04 | 750 | mutex_unlock(&debug_mutex); |
1da177e4 | 751 | |
66a464db | 752 | out: |
1da177e4 LT |
753 | return; |
754 | } | |
d5274369 | 755 | EXPORT_SYMBOL(debug_unregister); |
1da177e4 | 756 | |
66a464db MH |
757 | /* |
758 | * debug_set_size: | |
759 | * - set area size (number of pages) and number of areas | |
760 | */ | |
761 | static int | |
762 | debug_set_size(debug_info_t* id, int nr_areas, int pages_per_area) | |
763 | { | |
764 | unsigned long flags; | |
765 | debug_entry_t *** new_areas; | |
766 | int rc=0; | |
767 | ||
768 | if(!id || (nr_areas <= 0) || (pages_per_area < 0)) | |
769 | return -EINVAL; | |
770 | if(pages_per_area > 0){ | |
771 | new_areas = debug_areas_alloc(pages_per_area, nr_areas); | |
772 | if(!new_areas) { | |
c5612c19 MH |
773 | pr_info("Allocating memory for %i pages failed\n", |
774 | pages_per_area); | |
66a464db MH |
775 | rc = -ENOMEM; |
776 | goto out; | |
777 | } | |
778 | } else { | |
779 | new_areas = NULL; | |
780 | } | |
781 | spin_lock_irqsave(&id->lock,flags); | |
782 | debug_areas_free(id); | |
783 | id->areas = new_areas; | |
784 | id->nr_areas = nr_areas; | |
785 | id->pages_per_area = pages_per_area; | |
786 | id->active_area = 0; | |
787 | memset(id->active_entries,0,sizeof(int)*id->nr_areas); | |
788 | memset(id->active_pages, 0, sizeof(int)*id->nr_areas); | |
789 | spin_unlock_irqrestore(&id->lock,flags); | |
c5612c19 | 790 | pr_info("%s: set new size (%i pages)\n" ,id->name, pages_per_area); |
66a464db MH |
791 | out: |
792 | return rc; | |
793 | } | |
794 | ||
1da177e4 LT |
795 | /* |
796 | * debug_set_level: | |
797 | * - set actual debug level | |
798 | */ | |
799 | ||
66a464db MH |
800 | void |
801 | debug_set_level(debug_info_t* id, int new_level) | |
1da177e4 LT |
802 | { |
803 | unsigned long flags; | |
804 | if(!id) | |
805 | return; | |
806 | spin_lock_irqsave(&id->lock,flags); | |
807 | if(new_level == DEBUG_OFF_LEVEL){ | |
808 | id->level = DEBUG_OFF_LEVEL; | |
c5612c19 | 809 | pr_info("%s: switched off\n",id->name); |
1da177e4 | 810 | } else if ((new_level > DEBUG_MAX_LEVEL) || (new_level < 0)) { |
c5612c19 | 811 | pr_info("%s: level %i is out of range (%i - %i)\n", |
1da177e4 LT |
812 | id->name, new_level, 0, DEBUG_MAX_LEVEL); |
813 | } else { | |
814 | id->level = new_level; | |
1da177e4 LT |
815 | } |
816 | spin_unlock_irqrestore(&id->lock,flags); | |
817 | } | |
d5274369 | 818 | EXPORT_SYMBOL(debug_set_level); |
1da177e4 LT |
819 | |
820 | /* | |
821 | * proceed_active_entry: | |
822 | * - set active entry to next in the ring buffer | |
823 | */ | |
824 | ||
4448aaf0 | 825 | static inline void |
66a464db | 826 | proceed_active_entry(debug_info_t * id) |
1da177e4 | 827 | { |
66a464db MH |
828 | if ((id->active_entries[id->active_area] += id->entry_size) |
829 | > (PAGE_SIZE - id->entry_size)){ | |
830 | id->active_entries[id->active_area] = 0; | |
831 | id->active_pages[id->active_area] = | |
832 | (id->active_pages[id->active_area] + 1) % | |
833 | id->pages_per_area; | |
834 | } | |
1da177e4 LT |
835 | } |
836 | ||
837 | /* | |
838 | * proceed_active_area: | |
839 | * - set active area to next in the ring buffer | |
840 | */ | |
841 | ||
4448aaf0 | 842 | static inline void |
66a464db | 843 | proceed_active_area(debug_info_t * id) |
1da177e4 LT |
844 | { |
845 | id->active_area++; | |
846 | id->active_area = id->active_area % id->nr_areas; | |
847 | } | |
848 | ||
849 | /* | |
850 | * get_active_entry: | |
851 | */ | |
852 | ||
4448aaf0 | 853 | static inline debug_entry_t* |
66a464db | 854 | get_active_entry(debug_info_t * id) |
1da177e4 | 855 | { |
66a464db MH |
856 | return (debug_entry_t *) (((char *) id->areas[id->active_area] |
857 | [id->active_pages[id->active_area]]) + | |
858 | id->active_entries[id->active_area]); | |
1da177e4 LT |
859 | } |
860 | ||
861 | /* | |
862 | * debug_finish_entry: | |
863 | * - set timestamp, caller address, cpu number etc. | |
864 | */ | |
865 | ||
4448aaf0 | 866 | static inline void |
66a464db MH |
867 | debug_finish_entry(debug_info_t * id, debug_entry_t* active, int level, |
868 | int exception) | |
1da177e4 | 869 | { |
8c071b0f | 870 | active->id.stck = get_tod_clock_fast(); |
1da177e4 LT |
871 | active->id.fields.cpuid = smp_processor_id(); |
872 | active->caller = __builtin_return_address(0); | |
873 | active->id.fields.exception = exception; | |
874 | active->id.fields.level = level; | |
875 | proceed_active_entry(id); | |
876 | if(exception) | |
877 | proceed_active_area(id); | |
878 | } | |
879 | ||
880 | static int debug_stoppable=1; | |
881 | static int debug_active=1; | |
882 | ||
1da177e4 LT |
883 | #define CTL_S390DBF_STOPPABLE 5678 |
884 | #define CTL_S390DBF_ACTIVE 5679 | |
885 | ||
886 | /* | |
887 | * proc handler for the running debug_active sysctl | |
888 | * always allow read, allow write only if debug_stoppable is set or | |
889 | * if debug_active is already off | |
890 | */ | |
66a464db | 891 | static int |
302bfe20 | 892 | s390dbf_procactive(struct ctl_table *table, int write, |
1da177e4 LT |
893 | void __user *buffer, size_t *lenp, loff_t *ppos) |
894 | { | |
895 | if (!write || debug_stoppable || !debug_active) | |
8d65af78 | 896 | return proc_dointvec(table, write, buffer, lenp, ppos); |
1da177e4 LT |
897 | else |
898 | return 0; | |
899 | } | |
900 | ||
901 | ||
902 | static struct ctl_table s390dbf_table[] = { | |
903 | { | |
1da177e4 LT |
904 | .procname = "debug_stoppable", |
905 | .data = &debug_stoppable, | |
906 | .maxlen = sizeof(int), | |
907 | .mode = S_IRUGO | S_IWUSR, | |
6d456111 | 908 | .proc_handler = proc_dointvec, |
1da177e4 LT |
909 | }, |
910 | { | |
1da177e4 LT |
911 | .procname = "debug_active", |
912 | .data = &debug_active, | |
913 | .maxlen = sizeof(int), | |
914 | .mode = S_IRUGO | S_IWUSR, | |
6d456111 | 915 | .proc_handler = s390dbf_procactive, |
1da177e4 | 916 | }, |
b05fd35d | 917 | { } |
1da177e4 LT |
918 | }; |
919 | ||
920 | static struct ctl_table s390dbf_dir_table[] = { | |
921 | { | |
1da177e4 LT |
922 | .procname = "s390dbf", |
923 | .maxlen = 0, | |
924 | .mode = S_IRUGO | S_IXUGO, | |
925 | .child = s390dbf_table, | |
926 | }, | |
b05fd35d | 927 | { } |
1da177e4 LT |
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 | } | |
d5274369 | 938 | EXPORT_SYMBOL(debug_stop_all); |
1da177e4 | 939 | |
3ab121ab MH |
940 | void debug_set_critical(void) |
941 | { | |
942 | debug_critical = 1; | |
943 | } | |
944 | ||
1da177e4 LT |
945 | /* |
946 | * debug_event_common: | |
947 | * - write debug entry with given size | |
948 | */ | |
949 | ||
66a464db MH |
950 | debug_entry_t* |
951 | debug_event_common(debug_info_t * id, int level, const void *buf, int len) | |
1da177e4 LT |
952 | { |
953 | unsigned long flags; | |
954 | debug_entry_t *active; | |
955 | ||
66a464db | 956 | if (!debug_active || !id->areas) |
1da177e4 | 957 | return NULL; |
3ab121ab MH |
958 | if (debug_critical) { |
959 | if (!spin_trylock_irqsave(&id->lock, flags)) | |
960 | return NULL; | |
961 | } else | |
962 | spin_lock_irqsave(&id->lock, flags); | |
1da177e4 LT |
963 | active = get_active_entry(id); |
964 | memset(DEBUG_DATA(active), 0, id->buf_size); | |
965 | memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size)); | |
966 | debug_finish_entry(id, active, level, 0); | |
967 | spin_unlock_irqrestore(&id->lock, flags); | |
968 | ||
969 | return active; | |
970 | } | |
d5274369 | 971 | EXPORT_SYMBOL(debug_event_common); |
1da177e4 LT |
972 | |
973 | /* | |
974 | * debug_exception_common: | |
975 | * - write debug entry with given size and switch to next debug area | |
976 | */ | |
977 | ||
66a464db MH |
978 | debug_entry_t |
979 | *debug_exception_common(debug_info_t * id, int level, const void *buf, int len) | |
1da177e4 LT |
980 | { |
981 | unsigned long flags; | |
982 | debug_entry_t *active; | |
983 | ||
66a464db | 984 | if (!debug_active || !id->areas) |
1da177e4 | 985 | return NULL; |
3ab121ab MH |
986 | if (debug_critical) { |
987 | if (!spin_trylock_irqsave(&id->lock, flags)) | |
988 | return NULL; | |
989 | } else | |
990 | spin_lock_irqsave(&id->lock, flags); | |
1da177e4 LT |
991 | active = get_active_entry(id); |
992 | memset(DEBUG_DATA(active), 0, id->buf_size); | |
993 | memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size)); | |
994 | debug_finish_entry(id, active, level, 1); | |
995 | spin_unlock_irqrestore(&id->lock, flags); | |
996 | ||
997 | return active; | |
998 | } | |
d5274369 | 999 | EXPORT_SYMBOL(debug_exception_common); |
1da177e4 LT |
1000 | |
1001 | /* | |
1002 | * counts arguments in format string for sprintf view | |
1003 | */ | |
1004 | ||
4448aaf0 | 1005 | static inline int |
66a464db | 1006 | debug_count_numargs(char *string) |
1da177e4 LT |
1007 | { |
1008 | int numargs=0; | |
1009 | ||
1010 | while(*string) { | |
1011 | if(*string++=='%') | |
1012 | numargs++; | |
1013 | } | |
1014 | return(numargs); | |
1015 | } | |
1016 | ||
1017 | /* | |
1018 | * debug_sprintf_event: | |
1019 | */ | |
1020 | ||
66a464db | 1021 | debug_entry_t* |
832a7710 | 1022 | __debug_sprintf_event(debug_info_t *id, int level, char *string, ...) |
1da177e4 LT |
1023 | { |
1024 | va_list ap; | |
1025 | int numargs,idx; | |
1026 | unsigned long flags; | |
1027 | debug_sprintf_entry_t *curr_event; | |
1028 | debug_entry_t *active; | |
1029 | ||
66a464db | 1030 | if (!debug_active || !id->areas) |
1da177e4 LT |
1031 | return NULL; |
1032 | numargs=debug_count_numargs(string); | |
1033 | ||
3ab121ab MH |
1034 | if (debug_critical) { |
1035 | if (!spin_trylock_irqsave(&id->lock, flags)) | |
1036 | return NULL; | |
1037 | } else | |
1038 | spin_lock_irqsave(&id->lock, flags); | |
1da177e4 LT |
1039 | active = get_active_entry(id); |
1040 | curr_event=(debug_sprintf_entry_t *) DEBUG_DATA(active); | |
1041 | va_start(ap,string); | |
1042 | curr_event->string=string; | |
1043 | for(idx=0;idx<min(numargs,(int)(id->buf_size / sizeof(long))-1);idx++) | |
1044 | curr_event->args[idx]=va_arg(ap,long); | |
1045 | va_end(ap); | |
1046 | debug_finish_entry(id, active, level, 0); | |
1047 | spin_unlock_irqrestore(&id->lock, flags); | |
1048 | ||
1049 | return active; | |
1050 | } | |
832a7710 | 1051 | EXPORT_SYMBOL(__debug_sprintf_event); |
1da177e4 LT |
1052 | |
1053 | /* | |
1054 | * debug_sprintf_exception: | |
1055 | */ | |
1056 | ||
66a464db | 1057 | debug_entry_t* |
832a7710 | 1058 | __debug_sprintf_exception(debug_info_t *id, int level, char *string, ...) |
1da177e4 LT |
1059 | { |
1060 | va_list ap; | |
1061 | int numargs,idx; | |
1062 | unsigned long flags; | |
1063 | debug_sprintf_entry_t *curr_event; | |
1064 | debug_entry_t *active; | |
1065 | ||
66a464db | 1066 | if (!debug_active || !id->areas) |
1da177e4 LT |
1067 | return NULL; |
1068 | ||
1069 | numargs=debug_count_numargs(string); | |
1070 | ||
3ab121ab MH |
1071 | if (debug_critical) { |
1072 | if (!spin_trylock_irqsave(&id->lock, flags)) | |
1073 | return NULL; | |
1074 | } else | |
1075 | spin_lock_irqsave(&id->lock, flags); | |
1da177e4 LT |
1076 | active = get_active_entry(id); |
1077 | curr_event=(debug_sprintf_entry_t *)DEBUG_DATA(active); | |
1078 | va_start(ap,string); | |
1079 | curr_event->string=string; | |
1080 | for(idx=0;idx<min(numargs,(int)(id->buf_size / sizeof(long))-1);idx++) | |
1081 | curr_event->args[idx]=va_arg(ap,long); | |
1082 | va_end(ap); | |
1083 | debug_finish_entry(id, active, level, 1); | |
1084 | spin_unlock_irqrestore(&id->lock, flags); | |
1085 | ||
1086 | return active; | |
1087 | } | |
832a7710 | 1088 | EXPORT_SYMBOL(__debug_sprintf_exception); |
1da177e4 LT |
1089 | |
1090 | /* | |
1091 | * debug_register_view: | |
1092 | */ | |
1093 | ||
66a464db MH |
1094 | int |
1095 | debug_register_view(debug_info_t * id, struct debug_view *view) | |
1da177e4 LT |
1096 | { |
1097 | int rc = 0; | |
1098 | int i; | |
1099 | unsigned long flags; | |
f4ae40a6 | 1100 | umode_t mode; |
66a464db | 1101 | struct dentry *pde; |
1da177e4 LT |
1102 | |
1103 | if (!id) | |
1104 | goto out; | |
9637c3f3 MH |
1105 | mode = (id->mode | S_IFREG) & ~S_IXUGO; |
1106 | if (!(view->prolog_proc || view->format_proc || view->header_proc)) | |
1107 | mode &= ~(S_IRUSR | S_IRGRP | S_IROTH); | |
1108 | if (!view->input_proc) | |
1109 | mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH); | |
66a464db | 1110 | pde = debugfs_create_file(view->name, mode, id->debugfs_root_entry, |
942eaabd | 1111 | id , &debug_file_ops); |
1da177e4 | 1112 | if (!pde){ |
c5612c19 MH |
1113 | pr_err("Registering view %s/%s failed due to out of " |
1114 | "memory\n", id->name,view->name); | |
1da177e4 LT |
1115 | rc = -1; |
1116 | goto out; | |
1117 | } | |
1da177e4 LT |
1118 | spin_lock_irqsave(&id->lock, flags); |
1119 | for (i = 0; i < DEBUG_MAX_VIEWS; i++) { | |
66a464db | 1120 | if (!id->views[i]) |
1da177e4 LT |
1121 | break; |
1122 | } | |
1123 | if (i == DEBUG_MAX_VIEWS) { | |
c5612c19 MH |
1124 | pr_err("Registering view %s/%s would exceed the maximum " |
1125 | "number of views %i\n", id->name, view->name, i); | |
1da177e4 | 1126 | rc = -1; |
66a464db | 1127 | } else { |
1da177e4 | 1128 | id->views[i] = view; |
66a464db | 1129 | id->debugfs_entries[i] = pde; |
1da177e4 LT |
1130 | } |
1131 | spin_unlock_irqrestore(&id->lock, flags); | |
5a334c08 MH |
1132 | if (rc) |
1133 | debugfs_remove(pde); | |
66a464db | 1134 | out: |
1da177e4 LT |
1135 | return rc; |
1136 | } | |
d5274369 | 1137 | EXPORT_SYMBOL(debug_register_view); |
1da177e4 LT |
1138 | |
1139 | /* | |
1140 | * debug_unregister_view: | |
1141 | */ | |
1142 | ||
66a464db MH |
1143 | int |
1144 | debug_unregister_view(debug_info_t * id, struct debug_view *view) | |
1da177e4 | 1145 | { |
5a334c08 | 1146 | struct dentry *dentry = NULL; |
1da177e4 | 1147 | unsigned long flags; |
5a334c08 | 1148 | int i, rc = 0; |
1da177e4 LT |
1149 | |
1150 | if (!id) | |
1151 | goto out; | |
1152 | spin_lock_irqsave(&id->lock, flags); | |
1153 | for (i = 0; i < DEBUG_MAX_VIEWS; i++) { | |
1154 | if (id->views[i] == view) | |
1155 | break; | |
1156 | } | |
1157 | if (i == DEBUG_MAX_VIEWS) | |
1158 | rc = -1; | |
1159 | else { | |
5a334c08 | 1160 | dentry = id->debugfs_entries[i]; |
1da177e4 | 1161 | id->views[i] = NULL; |
5a334c08 | 1162 | id->debugfs_entries[i] = NULL; |
1da177e4 LT |
1163 | } |
1164 | spin_unlock_irqrestore(&id->lock, flags); | |
5a334c08 | 1165 | debugfs_remove(dentry); |
66a464db MH |
1166 | out: |
1167 | return rc; | |
1168 | } | |
d5274369 | 1169 | EXPORT_SYMBOL(debug_unregister_view); |
66a464db MH |
1170 | |
1171 | static inline char * | |
1172 | debug_get_user_string(const char __user *user_buf, size_t user_len) | |
1173 | { | |
1174 | char* buffer; | |
1175 | ||
1176 | buffer = kmalloc(user_len + 1, GFP_KERNEL); | |
1177 | if (!buffer) | |
1178 | return ERR_PTR(-ENOMEM); | |
1179 | if (copy_from_user(buffer, user_buf, user_len) != 0) { | |
1180 | kfree(buffer); | |
1181 | return ERR_PTR(-EFAULT); | |
1182 | } | |
1183 | /* got the string, now strip linefeed. */ | |
1184 | if (buffer[user_len - 1] == '\n') | |
1185 | buffer[user_len - 1] = 0; | |
1186 | else | |
1187 | buffer[user_len] = 0; | |
1188 | return buffer; | |
1189 | } | |
1190 | ||
1191 | static inline int | |
1192 | debug_get_uint(char *buf) | |
1193 | { | |
1194 | int rc; | |
1195 | ||
e7d2860b | 1196 | buf = skip_spaces(buf); |
66a464db MH |
1197 | rc = simple_strtoul(buf, &buf, 10); |
1198 | if(*buf){ | |
66a464db MH |
1199 | rc = -EINVAL; |
1200 | } | |
1da177e4 LT |
1201 | return rc; |
1202 | } | |
1203 | ||
1204 | /* | |
1205 | * functions for debug-views | |
1206 | *********************************** | |
1207 | */ | |
1208 | ||
1209 | /* | |
1210 | * prints out actual debug level | |
1211 | */ | |
1212 | ||
66a464db MH |
1213 | static int |
1214 | debug_prolog_pages_fn(debug_info_t * id, | |
1da177e4 | 1215 | struct debug_view *view, char *out_buf) |
66a464db MH |
1216 | { |
1217 | return sprintf(out_buf, "%i\n", id->pages_per_area); | |
1218 | } | |
1219 | ||
1220 | /* | |
1221 | * reads new size (number of pages per debug area) | |
1222 | */ | |
1223 | ||
1224 | static int | |
1225 | debug_input_pages_fn(debug_info_t * id, struct debug_view *view, | |
1226 | struct file *file, const char __user *user_buf, | |
1227 | size_t user_len, loff_t * offset) | |
1228 | { | |
1229 | char *str; | |
1230 | int rc,new_pages; | |
1231 | ||
1232 | if (user_len > 0x10000) | |
1233 | user_len = 0x10000; | |
1234 | if (*offset != 0){ | |
1235 | rc = -EPIPE; | |
1236 | goto out; | |
1237 | } | |
1238 | str = debug_get_user_string(user_buf,user_len); | |
1239 | if(IS_ERR(str)){ | |
1240 | rc = PTR_ERR(str); | |
1241 | goto out; | |
1242 | } | |
1243 | new_pages = debug_get_uint(str); | |
1244 | if(new_pages < 0){ | |
1245 | rc = -EINVAL; | |
1246 | goto free_str; | |
1247 | } | |
1248 | rc = debug_set_size(id,id->nr_areas, new_pages); | |
1249 | if(rc != 0){ | |
1250 | rc = -EINVAL; | |
1251 | goto free_str; | |
1252 | } | |
1253 | rc = user_len; | |
1254 | free_str: | |
1255 | kfree(str); | |
1256 | out: | |
1257 | *offset += user_len; | |
1258 | return rc; /* number of input characters */ | |
1259 | } | |
1260 | ||
1261 | /* | |
1262 | * prints out actual debug level | |
1263 | */ | |
1264 | ||
1265 | static int | |
1266 | debug_prolog_level_fn(debug_info_t * id, struct debug_view *view, char *out_buf) | |
1da177e4 LT |
1267 | { |
1268 | int rc = 0; | |
1269 | ||
66a464db MH |
1270 | if(id->level == DEBUG_OFF_LEVEL) { |
1271 | rc = sprintf(out_buf,"-\n"); | |
1272 | } | |
1273 | else { | |
1274 | rc = sprintf(out_buf, "%i\n", id->level); | |
1275 | } | |
1da177e4 LT |
1276 | return rc; |
1277 | } | |
1278 | ||
1279 | /* | |
1280 | * reads new debug level | |
1281 | */ | |
1282 | ||
66a464db MH |
1283 | static int |
1284 | debug_input_level_fn(debug_info_t * id, struct debug_view *view, | |
1285 | struct file *file, const char __user *user_buf, | |
1286 | size_t user_len, loff_t * offset) | |
1da177e4 | 1287 | { |
66a464db MH |
1288 | char *str; |
1289 | int rc,new_level; | |
1da177e4 | 1290 | |
66a464db MH |
1291 | if (user_len > 0x10000) |
1292 | user_len = 0x10000; | |
1293 | if (*offset != 0){ | |
1294 | rc = -EPIPE; | |
1da177e4 | 1295 | goto out; |
66a464db MH |
1296 | } |
1297 | str = debug_get_user_string(user_buf,user_len); | |
1298 | if(IS_ERR(str)){ | |
1299 | rc = PTR_ERR(str); | |
1da177e4 LT |
1300 | goto out; |
1301 | } | |
66a464db | 1302 | if(str[0] == '-'){ |
1da177e4 | 1303 | debug_set_level(id, DEBUG_OFF_LEVEL); |
66a464db MH |
1304 | rc = user_len; |
1305 | goto free_str; | |
1da177e4 | 1306 | } else { |
66a464db | 1307 | new_level = debug_get_uint(str); |
1da177e4 | 1308 | } |
66a464db | 1309 | if(new_level < 0) { |
c5612c19 MH |
1310 | pr_warning("%s is not a valid level for a debug " |
1311 | "feature\n", str); | |
66a464db MH |
1312 | rc = -EINVAL; |
1313 | } else { | |
1314 | debug_set_level(id, new_level); | |
1315 | rc = user_len; | |
1316 | } | |
1317 | free_str: | |
1318 | kfree(str); | |
1319 | out: | |
1320 | *offset += user_len; | |
1da177e4 LT |
1321 | return rc; /* number of input characters */ |
1322 | } | |
1323 | ||
1324 | ||
1325 | /* | |
1326 | * flushes debug areas | |
1327 | */ | |
1328 | ||
2b67fc46 | 1329 | static void debug_flush(debug_info_t* id, int area) |
1da177e4 LT |
1330 | { |
1331 | unsigned long flags; | |
66a464db | 1332 | int i,j; |
1da177e4 | 1333 | |
66a464db | 1334 | if(!id || !id->areas) |
1da177e4 LT |
1335 | return; |
1336 | spin_lock_irqsave(&id->lock,flags); | |
1337 | if(area == DEBUG_FLUSH_ALL){ | |
1338 | id->active_area = 0; | |
66a464db MH |
1339 | memset(id->active_entries, 0, id->nr_areas * sizeof(int)); |
1340 | for (i = 0; i < id->nr_areas; i++) { | |
1341 | id->active_pages[i] = 0; | |
1342 | for(j = 0; j < id->pages_per_area; j++) { | |
1343 | memset(id->areas[i][j], 0, PAGE_SIZE); | |
1344 | } | |
1345 | } | |
1da177e4 | 1346 | } else if(area >= 0 && area < id->nr_areas) { |
66a464db MH |
1347 | id->active_entries[area] = 0; |
1348 | id->active_pages[area] = 0; | |
1349 | for(i = 0; i < id->pages_per_area; i++) { | |
1350 | memset(id->areas[area][i],0,PAGE_SIZE); | |
1351 | } | |
1da177e4 LT |
1352 | } |
1353 | spin_unlock_irqrestore(&id->lock,flags); | |
1354 | } | |
1355 | ||
1356 | /* | |
1357 | * view function: flushes debug areas | |
1358 | */ | |
1359 | ||
66a464db MH |
1360 | static int |
1361 | debug_input_flush_fn(debug_info_t * id, struct debug_view *view, | |
1362 | struct file *file, const char __user *user_buf, | |
1363 | size_t user_len, loff_t * offset) | |
1da177e4 LT |
1364 | { |
1365 | char input_buf[1]; | |
66a464db MH |
1366 | int rc = user_len; |
1367 | ||
1368 | if (user_len > 0x10000) | |
1369 | user_len = 0x10000; | |
1370 | if (*offset != 0){ | |
1371 | rc = -EPIPE; | |
1da177e4 | 1372 | goto out; |
66a464db | 1373 | } |
1da177e4 LT |
1374 | if (copy_from_user(input_buf, user_buf, 1)){ |
1375 | rc = -EFAULT; | |
1376 | goto out; | |
1377 | } | |
1378 | if(input_buf[0] == '-') { | |
1379 | debug_flush(id, DEBUG_FLUSH_ALL); | |
1380 | goto out; | |
1381 | } | |
1382 | if (isdigit(input_buf[0])) { | |
1383 | int area = ((int) input_buf[0] - (int) '0'); | |
1384 | debug_flush(id, area); | |
1385 | goto out; | |
1386 | } | |
1387 | ||
c5612c19 MH |
1388 | pr_info("Flushing debug data failed because %c is not a valid " |
1389 | "area\n", input_buf[0]); | |
1da177e4 | 1390 | |
66a464db MH |
1391 | out: |
1392 | *offset += user_len; | |
1da177e4 LT |
1393 | return rc; /* number of input characters */ |
1394 | } | |
1395 | ||
1396 | /* | |
1397 | * prints debug header in raw format | |
1398 | */ | |
1399 | ||
66a464db MH |
1400 | static int |
1401 | debug_raw_header_fn(debug_info_t * id, struct debug_view *view, | |
1402 | int area, debug_entry_t * entry, char *out_buf) | |
1da177e4 LT |
1403 | { |
1404 | int rc; | |
1405 | ||
1406 | rc = sizeof(debug_entry_t); | |
1407 | memcpy(out_buf,entry,sizeof(debug_entry_t)); | |
1408 | return rc; | |
1409 | } | |
1410 | ||
1411 | /* | |
1412 | * prints debug data in raw format | |
1413 | */ | |
1414 | ||
66a464db MH |
1415 | static int |
1416 | debug_raw_format_fn(debug_info_t * id, struct debug_view *view, | |
1da177e4 LT |
1417 | char *out_buf, const char *in_buf) |
1418 | { | |
1419 | int rc; | |
1420 | ||
1421 | rc = id->buf_size; | |
1422 | memcpy(out_buf, in_buf, id->buf_size); | |
1423 | return rc; | |
1424 | } | |
1425 | ||
1426 | /* | |
1427 | * prints debug data in hex/ascii format | |
1428 | */ | |
1429 | ||
66a464db MH |
1430 | static int |
1431 | debug_hex_ascii_format_fn(debug_info_t * id, struct debug_view *view, | |
1432 | char *out_buf, const char *in_buf) | |
1da177e4 LT |
1433 | { |
1434 | int i, rc = 0; | |
1435 | ||
1436 | for (i = 0; i < id->buf_size; i++) { | |
1437 | rc += sprintf(out_buf + rc, "%02x ", | |
1438 | ((unsigned char *) in_buf)[i]); | |
1439 | } | |
1440 | rc += sprintf(out_buf + rc, "| "); | |
1441 | for (i = 0; i < id->buf_size; i++) { | |
1442 | unsigned char c = in_buf[i]; | |
3ab121ab | 1443 | if (isascii(c) && isprint(c)) |
1da177e4 | 1444 | rc += sprintf(out_buf + rc, "%c", c); |
3ab121ab MH |
1445 | else |
1446 | rc += sprintf(out_buf + rc, "."); | |
1da177e4 LT |
1447 | } |
1448 | rc += sprintf(out_buf + rc, "\n"); | |
1449 | return rc; | |
1450 | } | |
1451 | ||
1452 | /* | |
1453 | * prints header for debug entry | |
1454 | */ | |
1455 | ||
66a464db MH |
1456 | int |
1457 | debug_dflt_header_fn(debug_info_t * id, struct debug_view *view, | |
1da177e4 LT |
1458 | int area, debug_entry_t * entry, char *out_buf) |
1459 | { | |
942eaabd | 1460 | struct timespec time_spec; |
1da177e4 LT |
1461 | char *except_str; |
1462 | unsigned long caller; | |
1463 | int rc = 0; | |
1464 | unsigned int level; | |
1465 | ||
1466 | level = entry->id.fields.level; | |
b592e89a | 1467 | stck_to_timespec(entry->id.stck, &time_spec); |
1da177e4 LT |
1468 | |
1469 | if (entry->id.fields.exception) | |
1470 | except_str = "*"; | |
1471 | else | |
1472 | except_str = "-"; | |
1473 | caller = ((unsigned long) entry->caller) & PSW_ADDR_INSN; | |
1474 | rc += sprintf(out_buf, "%02i %011lu:%06lu %1u %1s %02i %p ", | |
942eaabd | 1475 | area, time_spec.tv_sec, time_spec.tv_nsec / 1000, level, |
1da177e4 LT |
1476 | except_str, entry->id.fields.cpuid, (void *) caller); |
1477 | return rc; | |
1478 | } | |
d5274369 | 1479 | EXPORT_SYMBOL(debug_dflt_header_fn); |
1da177e4 LT |
1480 | |
1481 | /* | |
1482 | * prints debug data sprintf-formated: | |
1483 | * debug_sprinf_event/exception calls must be used together with this view | |
1484 | */ | |
1485 | ||
1486 | #define DEBUG_SPRINTF_MAX_ARGS 10 | |
1487 | ||
66a464db MH |
1488 | static int |
1489 | debug_sprintf_format_fn(debug_info_t * id, struct debug_view *view, | |
1490 | char *out_buf, debug_sprintf_entry_t *curr_event) | |
1da177e4 LT |
1491 | { |
1492 | int num_longs, num_used_args = 0,i, rc = 0; | |
1493 | int index[DEBUG_SPRINTF_MAX_ARGS]; | |
1494 | ||
1495 | /* count of longs fit into one entry */ | |
1496 | num_longs = id->buf_size / sizeof(long); | |
1497 | ||
1498 | if(num_longs < 1) | |
1499 | goto out; /* bufsize of entry too small */ | |
1500 | if(num_longs == 1) { | |
1501 | /* no args, we use only the string */ | |
1502 | strcpy(out_buf, curr_event->string); | |
1503 | rc = strlen(curr_event->string); | |
1504 | goto out; | |
1505 | } | |
1506 | ||
1507 | /* number of arguments used for sprintf (without the format string) */ | |
1508 | num_used_args = min(DEBUG_SPRINTF_MAX_ARGS, (num_longs - 1)); | |
1509 | ||
1510 | memset(index,0, DEBUG_SPRINTF_MAX_ARGS * sizeof(int)); | |
1511 | ||
1512 | for(i = 0; i < num_used_args; i++) | |
1513 | index[i] = i; | |
1514 | ||
1515 | rc = sprintf(out_buf, curr_event->string, curr_event->args[index[0]], | |
1516 | curr_event->args[index[1]], curr_event->args[index[2]], | |
1517 | curr_event->args[index[3]], curr_event->args[index[4]], | |
1518 | curr_event->args[index[5]], curr_event->args[index[6]], | |
1519 | curr_event->args[index[7]], curr_event->args[index[8]], | |
1520 | curr_event->args[index[9]]); | |
1521 | ||
1522 | out: | |
1523 | ||
1524 | return rc; | |
1525 | } | |
1526 | ||
1527 | /* | |
d5274369 HC |
1528 | * debug_init: |
1529 | * - is called exactly once to initialize the debug feature | |
1da177e4 | 1530 | */ |
d5274369 | 1531 | static int __init debug_init(void) |
1da177e4 | 1532 | { |
d5274369 HC |
1533 | s390dbf_sysctl_header = register_sysctl_table(s390dbf_dir_table); |
1534 | mutex_lock(&debug_mutex); | |
1535 | debug_debugfs_root_entry = debugfs_create_dir(DEBUG_DIR_ROOT, NULL); | |
1536 | initialized = 1; | |
1537 | mutex_unlock(&debug_mutex); | |
1538 | return 0; | |
1da177e4 | 1539 | } |
66a464db | 1540 | postcore_initcall(debug_init); |