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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | /* |
1da177e4 LT |
3 | * S/390 debug facility |
4 | * | |
3ab121ab MH |
5 | * Copyright IBM Corp. 1999, 2012 |
6 | * | |
1da177e4 | 7 | * Author(s): Michael Holzheu (holzheu@de.ibm.com), |
496da0d7 | 8 | * Holger Smolinski (Holger.Smolinski@de.ibm.com) |
1da177e4 LT |
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> | |
e7d2860b | 21 | #include <linux/string.h> |
1da177e4 | 22 | #include <linux/sysctl.h> |
7c0f6ba6 | 23 | #include <linux/uaccess.h> |
3994a52b | 24 | #include <linux/export.h> |
1da177e4 | 25 | #include <linux/init.h> |
66a464db MH |
26 | #include <linux/fs.h> |
27 | #include <linux/debugfs.h> | |
1da177e4 LT |
28 | |
29 | #include <asm/debug.h> | |
30 | ||
31 | #define DEBUG_PROLOG_ENTRY -1 | |
32 | ||
66a464db MH |
33 | #define ALL_AREAS 0 /* copy all debug areas */ |
34 | #define NO_AREAS 1 /* copy no debug areas */ | |
35 | ||
1da177e4 LT |
36 | /* typedefs */ |
37 | ||
38 | typedef struct file_private_info { | |
39 | loff_t offset; /* offset of last read in file */ | |
496da0d7 HC |
40 | int act_area; /* number of last formated area */ |
41 | int act_page; /* act page in given area */ | |
42 | int act_entry; /* last formated entry (offset */ | |
43 | /* relative to beginning of last */ | |
44 | /* formated page) */ | |
45 | size_t act_entry_offset; /* up to this offset we copied */ | |
1da177e4 LT |
46 | /* in last read the last formated */ |
47 | /* entry to userland */ | |
48 | char temp_buf[2048]; /* buffer for output */ | |
496da0d7 | 49 | debug_info_t *debug_info_org; /* original debug information */ |
1da177e4 LT |
50 | debug_info_t *debug_info_snap; /* snapshot of debug information */ |
51 | struct debug_view *view; /* used view of debug info */ | |
52 | } file_private_info_t; | |
53 | ||
496da0d7 | 54 | typedef struct { |
1da177e4 | 55 | char *string; |
496da0d7 HC |
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 | ||
1da177e4 LT |
65 | /* internal function prototyes */ |
66 | ||
67 | static int debug_init(void); | |
68 | static ssize_t debug_output(struct file *file, char __user *user_buf, | |
496da0d7 | 69 | size_t user_len, loff_t *offset); |
1da177e4 | 70 | static ssize_t debug_input(struct file *file, const char __user *user_buf, |
496da0d7 | 71 | size_t user_len, loff_t *offset); |
1da177e4 LT |
72 | static int debug_open(struct inode *inode, struct file *file); |
73 | static int debug_close(struct inode *inode, struct file *file); | |
5cbbf16a | 74 | static debug_info_t *debug_info_create(const char *name, int pages_per_area, |
496da0d7 | 75 | int nr_areas, int buf_size, umode_t mode); |
1da177e4 LT |
76 | static void debug_info_get(debug_info_t *); |
77 | static void debug_info_put(debug_info_t *); | |
496da0d7 HC |
78 | static int debug_prolog_level_fn(debug_info_t *id, |
79 | struct debug_view *view, char *out_buf); | |
80 | static int debug_input_level_fn(debug_info_t *id, struct debug_view *view, | |
81 | struct file *file, const char __user *user_buf, | |
82 | size_t user_buf_size, loff_t *offset); | |
83 | static int debug_prolog_pages_fn(debug_info_t *id, | |
84 | struct debug_view *view, char *out_buf); | |
85 | static int debug_input_pages_fn(debug_info_t *id, struct debug_view *view, | |
86 | struct file *file, const char __user *user_buf, | |
87 | size_t user_buf_size, loff_t *offset); | |
88 | static int debug_input_flush_fn(debug_info_t *id, struct debug_view *view, | |
89 | struct file *file, const char __user *user_buf, | |
90 | size_t user_buf_size, loff_t *offset); | |
91 | static int debug_hex_ascii_format_fn(debug_info_t *id, struct debug_view *view, | |
92 | char *out_buf, const char *in_buf); | |
93 | static int debug_raw_format_fn(debug_info_t *id, | |
94 | struct debug_view *view, char *out_buf, | |
95 | const char *in_buf); | |
96 | static int debug_raw_header_fn(debug_info_t *id, struct debug_view *view, | |
97 | int area, debug_entry_t *entry, char *out_buf); | |
98 | ||
99 | static int debug_sprintf_format_fn(debug_info_t *id, struct debug_view *view, | |
100 | char *out_buf, debug_sprintf_entry_t *curr_event); | |
1da177e4 LT |
101 | |
102 | /* globals */ | |
103 | ||
104 | struct debug_view debug_raw_view = { | |
105 | "raw", | |
106 | NULL, | |
107 | &debug_raw_header_fn, | |
108 | &debug_raw_format_fn, | |
109 | NULL, | |
110 | NULL | |
111 | }; | |
d5274369 | 112 | EXPORT_SYMBOL(debug_raw_view); |
1da177e4 LT |
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 | }; | |
d5274369 | 122 | EXPORT_SYMBOL(debug_hex_ascii_view); |
1da177e4 | 123 | |
2b67fc46 | 124 | static struct debug_view debug_level_view = { |
1da177e4 LT |
125 | "level", |
126 | &debug_prolog_level_fn, | |
127 | NULL, | |
128 | NULL, | |
129 | &debug_input_level_fn, | |
130 | NULL | |
131 | }; | |
132 | ||
2b67fc46 | 133 | static struct debug_view debug_pages_view = { |
66a464db MH |
134 | "pages", |
135 | &debug_prolog_pages_fn, | |
136 | NULL, | |
137 | NULL, | |
138 | &debug_input_pages_fn, | |
139 | NULL | |
140 | }; | |
141 | ||
2b67fc46 | 142 | static struct debug_view debug_flush_view = { |
496da0d7 HC |
143 | "flush", |
144 | NULL, | |
145 | NULL, | |
146 | NULL, | |
147 | &debug_input_flush_fn, | |
148 | NULL | |
1da177e4 LT |
149 | }; |
150 | ||
151 | struct debug_view debug_sprintf_view = { | |
152 | "sprintf", | |
153 | NULL, | |
154 | &debug_dflt_header_fn, | |
496da0d7 | 155 | (debug_format_proc_t *)&debug_sprintf_format_fn, |
1da177e4 LT |
156 | NULL, |
157 | NULL | |
158 | }; | |
d5274369 | 159 | EXPORT_SYMBOL(debug_sprintf_view); |
1da177e4 | 160 | |
2b67fc46 | 161 | /* used by dump analysis tools to determine version of debug feature */ |
a806170e | 162 | static unsigned int __used debug_feature_version = __DEBUG_FEATURE_VERSION; |
1da177e4 LT |
163 | |
164 | /* static globals */ | |
165 | ||
496da0d7 HC |
166 | static debug_info_t *debug_area_first; |
167 | static debug_info_t *debug_area_last; | |
e11f0d04 | 168 | static DEFINE_MUTEX(debug_mutex); |
1da177e4 LT |
169 | |
170 | static int initialized; | |
3ab121ab | 171 | static int debug_critical; |
1da177e4 | 172 | |
5dfe4c96 | 173 | static const struct file_operations debug_file_ops = { |
496da0d7 HC |
174 | .owner = THIS_MODULE, |
175 | .read = debug_output, | |
176 | .write = debug_input, | |
177 | .open = debug_open, | |
1da177e4 | 178 | .release = debug_close, |
6038f373 | 179 | .llseek = no_llseek, |
1da177e4 LT |
180 | }; |
181 | ||
66a464db | 182 | static struct dentry *debug_debugfs_root_entry; |
1da177e4 LT |
183 | |
184 | /* functions */ | |
185 | ||
66a464db MH |
186 | /* |
187 | * debug_areas_alloc | |
188 | * - Debug areas are implemented as a threedimensonal array: | |
189 | * areas[areanumber][pagenumber][pageoffset] | |
190 | */ | |
191 | ||
496da0d7 | 192 | static debug_entry_t ***debug_areas_alloc(int pages_per_area, int nr_areas) |
66a464db | 193 | { |
496da0d7 HC |
194 | debug_entry_t ***areas; |
195 | int i, j; | |
66a464db | 196 | |
6da2ec56 | 197 | areas = kmalloc_array(nr_areas, sizeof(debug_entry_t **), GFP_KERNEL); |
66a464db MH |
198 | if (!areas) |
199 | goto fail_malloc_areas; | |
200 | for (i = 0; i < nr_areas; i++) { | |
6da2ec56 KC |
201 | areas[i] = kmalloc_array(pages_per_area, |
202 | sizeof(debug_entry_t *), | |
203 | GFP_KERNEL); | |
496da0d7 | 204 | if (!areas[i]) |
66a464db | 205 | goto fail_malloc_areas2; |
496da0d7 | 206 | for (j = 0; j < pages_per_area; j++) { |
fb630517 | 207 | areas[i][j] = kzalloc(PAGE_SIZE, GFP_KERNEL); |
496da0d7 HC |
208 | if (!areas[i][j]) { |
209 | for (j--; j >= 0 ; j--) | |
66a464db | 210 | kfree(areas[i][j]); |
66a464db MH |
211 | kfree(areas[i]); |
212 | goto fail_malloc_areas2; | |
66a464db MH |
213 | } |
214 | } | |
215 | } | |
216 | return areas; | |
217 | ||
218 | fail_malloc_areas2: | |
496da0d7 HC |
219 | for (i--; i >= 0; i--) { |
220 | for (j = 0; j < pages_per_area; j++) | |
66a464db | 221 | kfree(areas[i][j]); |
66a464db MH |
222 | kfree(areas[i]); |
223 | } | |
224 | kfree(areas); | |
225 | fail_malloc_areas: | |
226 | return NULL; | |
66a464db MH |
227 | } |
228 | ||
1da177e4 LT |
229 | /* |
230 | * debug_info_alloc | |
231 | * - alloc new debug-info | |
232 | */ | |
496da0d7 HC |
233 | static debug_info_t *debug_info_alloc(const char *name, int pages_per_area, |
234 | int nr_areas, int buf_size, int level, | |
235 | int mode) | |
1da177e4 | 236 | { |
496da0d7 | 237 | debug_info_t *rc; |
1da177e4 LT |
238 | |
239 | /* alloc everything */ | |
5cbded58 | 240 | rc = kmalloc(sizeof(debug_info_t), GFP_KERNEL); |
496da0d7 | 241 | if (!rc) |
1da177e4 | 242 | goto fail_malloc_rc; |
fb630517 | 243 | rc->active_entries = kcalloc(nr_areas, sizeof(int), GFP_KERNEL); |
496da0d7 | 244 | if (!rc->active_entries) |
66a464db | 245 | goto fail_malloc_active_entries; |
fb630517 | 246 | rc->active_pages = kcalloc(nr_areas, sizeof(int), GFP_KERNEL); |
496da0d7 | 247 | if (!rc->active_pages) |
66a464db | 248 | goto fail_malloc_active_pages; |
496da0d7 | 249 | if ((mode == ALL_AREAS) && (pages_per_area != 0)) { |
66a464db | 250 | rc->areas = debug_areas_alloc(pages_per_area, nr_areas); |
496da0d7 | 251 | if (!rc->areas) |
66a464db MH |
252 | goto fail_malloc_areas; |
253 | } else { | |
254 | rc->areas = NULL; | |
1da177e4 LT |
255 | } |
256 | ||
257 | /* initialize members */ | |
1da177e4 | 258 | spin_lock_init(&rc->lock); |
66a464db | 259 | rc->pages_per_area = pages_per_area; |
496da0d7 | 260 | rc->nr_areas = nr_areas; |
66a464db | 261 | rc->active_area = 0; |
496da0d7 HC |
262 | rc->level = level; |
263 | rc->buf_size = buf_size; | |
264 | rc->entry_size = sizeof(debug_entry_t) + buf_size; | |
20cb9e79 | 265 | strlcpy(rc->name, name, sizeof(rc->name)); |
1da177e4 | 266 | memset(rc->views, 0, DEBUG_MAX_VIEWS * sizeof(struct debug_view *)); |
496da0d7 | 267 | memset(rc->debugfs_entries, 0, DEBUG_MAX_VIEWS * sizeof(struct dentry *)); |
efc0c21c | 268 | refcount_set(&(rc->ref_count), 0); |
1da177e4 LT |
269 | |
270 | return rc; | |
271 | ||
1da177e4 | 272 | fail_malloc_areas: |
66a464db MH |
273 | kfree(rc->active_pages); |
274 | fail_malloc_active_pages: | |
275 | kfree(rc->active_entries); | |
276 | fail_malloc_active_entries: | |
1da177e4 LT |
277 | kfree(rc); |
278 | fail_malloc_rc: | |
279 | return NULL; | |
280 | } | |
281 | ||
282 | /* | |
66a464db MH |
283 | * debug_areas_free |
284 | * - free all debug areas | |
1da177e4 | 285 | */ |
496da0d7 | 286 | static void debug_areas_free(debug_info_t *db_info) |
66a464db | 287 | { |
496da0d7 | 288 | int i, j; |
66a464db | 289 | |
496da0d7 | 290 | if (!db_info->areas) |
66a464db | 291 | return; |
1da177e4 | 292 | for (i = 0; i < db_info->nr_areas; i++) { |
496da0d7 | 293 | for (j = 0; j < db_info->pages_per_area; j++) |
66a464db | 294 | kfree(db_info->areas[i][j]); |
66a464db | 295 | kfree(db_info->areas[i]); |
1da177e4 LT |
296 | } |
297 | kfree(db_info->areas); | |
66a464db MH |
298 | db_info->areas = NULL; |
299 | } | |
300 | ||
301 | /* | |
302 | * debug_info_free | |
303 | * - free memory debug-info | |
304 | */ | |
496da0d7 HC |
305 | static void debug_info_free(debug_info_t *db_info) |
306 | { | |
66a464db MH |
307 | debug_areas_free(db_info); |
308 | kfree(db_info->active_entries); | |
309 | kfree(db_info->active_pages); | |
1da177e4 LT |
310 | kfree(db_info); |
311 | } | |
312 | ||
313 | /* | |
314 | * debug_info_create | |
315 | * - create new debug-info | |
316 | */ | |
317 | ||
496da0d7 HC |
318 | static debug_info_t *debug_info_create(const char *name, int pages_per_area, |
319 | int nr_areas, int buf_size, umode_t mode) | |
1da177e4 | 320 | { |
496da0d7 | 321 | debug_info_t *rc; |
1da177e4 | 322 | |
496da0d7 HC |
323 | rc = debug_info_alloc(name, pages_per_area, nr_areas, buf_size, |
324 | DEBUG_DEFAULT_LEVEL, ALL_AREAS); | |
325 | if (!rc) | |
1da177e4 LT |
326 | goto out; |
327 | ||
9637c3f3 MH |
328 | rc->mode = mode & ~S_IFMT; |
329 | ||
66a464db | 330 | /* create root directory */ |
496da0d7 HC |
331 | rc->debugfs_root_entry = debugfs_create_dir(rc->name, |
332 | debug_debugfs_root_entry); | |
1da177e4 LT |
333 | |
334 | /* append new element to linked list */ | |
496da0d7 HC |
335 | if (!debug_area_first) { |
336 | /* first element in list */ | |
337 | debug_area_first = rc; | |
338 | rc->prev = NULL; | |
339 | } else { | |
340 | /* append element to end of list */ | |
341 | debug_area_last->next = rc; | |
342 | rc->prev = debug_area_last; | |
343 | } | |
344 | debug_area_last = rc; | |
345 | rc->next = NULL; | |
1da177e4 | 346 | |
efc0c21c | 347 | refcount_set(&rc->ref_count, 1); |
1da177e4 LT |
348 | out: |
349 | return rc; | |
350 | } | |
351 | ||
352 | /* | |
353 | * debug_info_copy | |
354 | * - copy debug-info | |
355 | */ | |
496da0d7 | 356 | static debug_info_t *debug_info_copy(debug_info_t *in, int mode) |
1da177e4 | 357 | { |
496da0d7 HC |
358 | unsigned long flags; |
359 | debug_info_t *rc; | |
360 | int i, j; | |
942eaabd MH |
361 | |
362 | /* get a consistent copy of the debug areas */ | |
363 | do { | |
364 | rc = debug_info_alloc(in->name, in->pages_per_area, | |
365 | in->nr_areas, in->buf_size, in->level, mode); | |
366 | spin_lock_irqsave(&in->lock, flags); | |
496da0d7 | 367 | if (!rc) |
942eaabd MH |
368 | goto out; |
369 | /* has something changed in the meantime ? */ | |
496da0d7 HC |
370 | if ((rc->pages_per_area == in->pages_per_area) && |
371 | (rc->nr_areas == in->nr_areas)) { | |
942eaabd MH |
372 | break; |
373 | } | |
374 | spin_unlock_irqrestore(&in->lock, flags); | |
375 | debug_info_free(rc); | |
376 | } while (1); | |
66a464db | 377 | |
acfa922c | 378 | if (mode == NO_AREAS) |
496da0d7 | 379 | goto out; |
1da177e4 | 380 | |
496da0d7 HC |
381 | for (i = 0; i < in->nr_areas; i++) { |
382 | for (j = 0; j < in->pages_per_area; j++) | |
383 | memcpy(rc->areas[i][j], in->areas[i][j], PAGE_SIZE); | |
384 | } | |
1da177e4 | 385 | out: |
496da0d7 HC |
386 | spin_unlock_irqrestore(&in->lock, flags); |
387 | return rc; | |
1da177e4 LT |
388 | } |
389 | ||
390 | /* | |
391 | * debug_info_get | |
392 | * - increments reference count for debug-info | |
393 | */ | |
496da0d7 | 394 | static void debug_info_get(debug_info_t *db_info) |
1da177e4 LT |
395 | { |
396 | if (db_info) | |
efc0c21c | 397 | refcount_inc(&db_info->ref_count); |
1da177e4 LT |
398 | } |
399 | ||
400 | /* | |
401 | * debug_info_put: | |
402 | * - decreases reference count for debug-info and frees it if necessary | |
403 | */ | |
496da0d7 | 404 | static void debug_info_put(debug_info_t *db_info) |
1da177e4 LT |
405 | { |
406 | int i; | |
407 | ||
408 | if (!db_info) | |
409 | return; | |
efc0c21c | 410 | if (refcount_dec_and_test(&db_info->ref_count)) { |
1da177e4 | 411 | for (i = 0; i < DEBUG_MAX_VIEWS; i++) { |
66a464db | 412 | if (!db_info->views[i]) |
1da177e4 | 413 | continue; |
66a464db | 414 | debugfs_remove(db_info->debugfs_entries[i]); |
1da177e4 | 415 | } |
66a464db | 416 | debugfs_remove(db_info->debugfs_root_entry); |
496da0d7 | 417 | if (db_info == debug_area_first) |
1da177e4 | 418 | debug_area_first = db_info->next; |
496da0d7 | 419 | if (db_info == debug_area_last) |
1da177e4 | 420 | debug_area_last = db_info->prev; |
496da0d7 HC |
421 | if (db_info->prev) |
422 | db_info->prev->next = db_info->next; | |
423 | if (db_info->next) | |
424 | db_info->next->prev = db_info->prev; | |
1da177e4 LT |
425 | debug_info_free(db_info); |
426 | } | |
427 | } | |
428 | ||
429 | /* | |
430 | * debug_format_entry: | |
431 | * - format one debug entry and return size of formated data | |
432 | */ | |
496da0d7 | 433 | static int debug_format_entry(file_private_info_t *p_info) |
1da177e4 | 434 | { |
496da0d7 | 435 | debug_info_t *id_snap = p_info->debug_info_snap; |
1da177e4 LT |
436 | struct debug_view *view = p_info->view; |
437 | debug_entry_t *act_entry; | |
438 | size_t len = 0; | |
496da0d7 HC |
439 | |
440 | if (p_info->act_entry == DEBUG_PROLOG_ENTRY) { | |
1da177e4 | 441 | /* print prolog */ |
496da0d7 HC |
442 | if (view->prolog_proc) |
443 | len += view->prolog_proc(id_snap, view, p_info->temp_buf); | |
1da177e4 LT |
444 | goto out; |
445 | } | |
66a464db MH |
446 | if (!id_snap->areas) /* this is true, if we have a prolog only view */ |
447 | goto out; /* or if 'pages_per_area' is 0 */ | |
496da0d7 HC |
448 | act_entry = (debug_entry_t *) ((char *)id_snap->areas[p_info->act_area] |
449 | [p_info->act_page] + p_info->act_entry); | |
450 | ||
1da177e4 | 451 | if (act_entry->id.stck == 0LL) |
496da0d7 | 452 | goto out; /* empty entry */ |
1da177e4 | 453 | if (view->header_proc) |
66a464db | 454 | len += view->header_proc(id_snap, view, p_info->act_area, |
496da0d7 | 455 | act_entry, p_info->temp_buf + len); |
1da177e4 | 456 | if (view->format_proc) |
66a464db | 457 | len += view->format_proc(id_snap, view, p_info->temp_buf + len, |
496da0d7 | 458 | DEBUG_DATA(act_entry)); |
66a464db | 459 | out: |
496da0d7 | 460 | return len; |
1da177e4 LT |
461 | } |
462 | ||
463 | /* | |
464 | * debug_next_entry: | |
465 | * - goto next entry in p_info | |
466 | */ | |
496da0d7 | 467 | static inline int debug_next_entry(file_private_info_t *p_info) |
1da177e4 | 468 | { |
66a464db MH |
469 | debug_info_t *id; |
470 | ||
471 | id = p_info->debug_info_snap; | |
496da0d7 | 472 | if (p_info->act_entry == DEBUG_PROLOG_ENTRY) { |
1da177e4 | 473 | p_info->act_entry = 0; |
66a464db | 474 | p_info->act_page = 0; |
1da177e4 LT |
475 | goto out; |
476 | } | |
496da0d7 | 477 | if (!id->areas) |
66a464db MH |
478 | return 1; |
479 | p_info->act_entry += id->entry_size; | |
480 | /* switch to next page, if we reached the end of the page */ | |
496da0d7 | 481 | if (p_info->act_entry > (PAGE_SIZE - id->entry_size)) { |
66a464db | 482 | /* next page */ |
1da177e4 | 483 | p_info->act_entry = 0; |
66a464db | 484 | p_info->act_page += 1; |
496da0d7 | 485 | if ((p_info->act_page % id->pages_per_area) == 0) { |
66a464db | 486 | /* next area */ |
496da0d7 HC |
487 | p_info->act_area++; |
488 | p_info->act_page = 0; | |
66a464db | 489 | } |
496da0d7 | 490 | if (p_info->act_area >= id->nr_areas) |
1da177e4 LT |
491 | return 1; |
492 | } | |
493 | out: | |
496da0d7 | 494 | return 0; |
1da177e4 LT |
495 | } |
496 | ||
497 | /* | |
498 | * debug_output: | |
499 | * - called for user read() | |
500 | * - copies formated debug entries to the user buffer | |
501 | */ | |
496da0d7 HC |
502 | static ssize_t debug_output(struct file *file, /* file descriptor */ |
503 | char __user *user_buf, /* user buffer */ | |
504 | size_t len, /* length of buffer */ | |
505 | loff_t *offset) /* offset in the file */ | |
1da177e4 LT |
506 | { |
507 | size_t count = 0; | |
66a464db | 508 | size_t entry_offset; |
1da177e4 LT |
509 | file_private_info_t *p_info; |
510 | ||
496da0d7 HC |
511 | p_info = (file_private_info_t *) file->private_data; |
512 | if (*offset != p_info->offset) | |
1da177e4 | 513 | return -EPIPE; |
496da0d7 | 514 | if (p_info->act_area >= p_info->debug_info_snap->nr_areas) |
1da177e4 | 515 | return 0; |
1da177e4 | 516 | entry_offset = p_info->act_entry_offset; |
496da0d7 | 517 | while (count < len) { |
66a464db | 518 | int formatted_line_residue; |
496da0d7 | 519 | int formatted_line_size; |
66a464db MH |
520 | int user_buf_residue; |
521 | size_t copy_size; | |
522 | ||
523 | formatted_line_size = debug_format_entry(p_info); | |
524 | formatted_line_residue = formatted_line_size - entry_offset; | |
525 | user_buf_residue = len-count; | |
526 | copy_size = min(user_buf_residue, formatted_line_residue); | |
496da0d7 | 527 | if (copy_size) { |
66a464db | 528 | if (copy_to_user(user_buf + count, p_info->temp_buf |
496da0d7 | 529 | + entry_offset, copy_size)) |
66a464db MH |
530 | return -EFAULT; |
531 | count += copy_size; | |
532 | entry_offset += copy_size; | |
1da177e4 | 533 | } |
496da0d7 | 534 | if (copy_size == formatted_line_residue) { |
66a464db | 535 | entry_offset = 0; |
496da0d7 | 536 | if (debug_next_entry(p_info)) |
1da177e4 | 537 | goto out; |
66a464db | 538 | } |
1da177e4 LT |
539 | } |
540 | out: | |
496da0d7 | 541 | p_info->offset = *offset + count; |
66a464db | 542 | p_info->act_entry_offset = entry_offset; |
1da177e4 LT |
543 | *offset = p_info->offset; |
544 | return count; | |
545 | } | |
546 | ||
547 | /* | |
548 | * debug_input: | |
549 | * - called for user write() | |
550 | * - calls input function of view | |
551 | */ | |
496da0d7 HC |
552 | static ssize_t debug_input(struct file *file, const char __user *user_buf, |
553 | size_t length, loff_t *offset) | |
1da177e4 | 554 | { |
1da177e4 | 555 | file_private_info_t *p_info; |
496da0d7 | 556 | int rc = 0; |
1da177e4 | 557 | |
e11f0d04 | 558 | mutex_lock(&debug_mutex); |
1da177e4 | 559 | p_info = ((file_private_info_t *) file->private_data); |
496da0d7 | 560 | if (p_info->view->input_proc) { |
1da177e4 LT |
561 | rc = p_info->view->input_proc(p_info->debug_info_org, |
562 | p_info->view, file, user_buf, | |
563 | length, offset); | |
496da0d7 | 564 | } else { |
1da177e4 | 565 | rc = -EPERM; |
496da0d7 | 566 | } |
e11f0d04 | 567 | mutex_unlock(&debug_mutex); |
496da0d7 | 568 | return rc; /* number of input characters */ |
1da177e4 LT |
569 | } |
570 | ||
571 | /* | |
572 | * debug_open: | |
573 | * - called for user open() | |
574 | * - copies formated output to private_data area of the file | |
575 | * handle | |
576 | */ | |
496da0d7 | 577 | static int debug_open(struct inode *inode, struct file *file) |
1da177e4 | 578 | { |
1da177e4 | 579 | debug_info_t *debug_info, *debug_info_snapshot; |
496da0d7 HC |
580 | file_private_info_t *p_info; |
581 | int i, rc = 0; | |
1da177e4 | 582 | |
e11f0d04 | 583 | mutex_lock(&debug_mutex); |
496ad9aa | 584 | debug_info = file_inode(file)->i_private; |
942eaabd MH |
585 | /* find debug view */ |
586 | for (i = 0; i < DEBUG_MAX_VIEWS; i++) { | |
587 | if (!debug_info->views[i]) | |
588 | continue; | |
496da0d7 HC |
589 | else if (debug_info->debugfs_entries[i] == file->f_path.dentry) |
590 | goto found; /* found view ! */ | |
1da177e4 LT |
591 | } |
592 | /* no entry found */ | |
593 | rc = -EINVAL; | |
594 | goto out; | |
595 | ||
66a464db | 596 | found: |
1da177e4 | 597 | |
496da0d7 | 598 | /* Make snapshot of current debug areas to get it consistent. */ |
66a464db MH |
599 | /* To copy all the areas is only needed, if we have a view which */ |
600 | /* formats the debug areas. */ | |
1da177e4 | 601 | |
496da0d7 | 602 | if (!debug_info->views[i]->format_proc && !debug_info->views[i]->header_proc) |
66a464db | 603 | debug_info_snapshot = debug_info_copy(debug_info, NO_AREAS); |
496da0d7 | 604 | else |
66a464db | 605 | debug_info_snapshot = debug_info_copy(debug_info, ALL_AREAS); |
1da177e4 | 606 | |
496da0d7 | 607 | if (!debug_info_snapshot) { |
1da177e4 LT |
608 | rc = -ENOMEM; |
609 | goto out; | |
610 | } | |
496da0d7 HC |
611 | p_info = kmalloc(sizeof(file_private_info_t), GFP_KERNEL); |
612 | if (!p_info) { | |
58ace9f2 | 613 | debug_info_free(debug_info_snapshot); |
1da177e4 LT |
614 | rc = -ENOMEM; |
615 | goto out; | |
616 | } | |
1da177e4 LT |
617 | p_info->offset = 0; |
618 | p_info->debug_info_snap = debug_info_snapshot; | |
496da0d7 | 619 | p_info->debug_info_org = debug_info; |
1da177e4 LT |
620 | p_info->view = debug_info->views[i]; |
621 | p_info->act_area = 0; | |
66a464db | 622 | p_info->act_page = 0; |
1da177e4 LT |
623 | p_info->act_entry = DEBUG_PROLOG_ENTRY; |
624 | p_info->act_entry_offset = 0; | |
66a464db | 625 | file->private_data = p_info; |
1da177e4 | 626 | debug_info_get(debug_info); |
58ea91c0 | 627 | nonseekable_open(inode, file); |
66a464db | 628 | out: |
e11f0d04 | 629 | mutex_unlock(&debug_mutex); |
1da177e4 LT |
630 | return rc; |
631 | } | |
632 | ||
633 | /* | |
634 | * debug_close: | |
635 | * - called for user close() | |
636 | * - deletes private_data area of the file handle | |
637 | */ | |
496da0d7 | 638 | static int debug_close(struct inode *inode, struct file *file) |
1da177e4 LT |
639 | { |
640 | file_private_info_t *p_info; | |
496da0d7 | 641 | |
1da177e4 | 642 | p_info = (file_private_info_t *) file->private_data; |
496da0d7 | 643 | if (p_info->debug_info_snap) |
66a464db | 644 | debug_info_free(p_info->debug_info_snap); |
1da177e4 LT |
645 | debug_info_put(p_info->debug_info_org); |
646 | kfree(file->private_data); | |
496da0d7 | 647 | return 0; /* success */ |
1da177e4 LT |
648 | } |
649 | ||
0328e519 SM |
650 | /** |
651 | * debug_register_mode() - creates and initializes debug area. | |
652 | * | |
653 | * @name: Name of debug log (e.g. used for debugfs entry) | |
654 | * @pages_per_area: Number of pages, which will be allocated per area | |
655 | * @nr_areas: Number of debug areas | |
656 | * @buf_size: Size of data area in each debug entry | |
657 | * @mode: File mode for debugfs files. E.g. S_IRWXUGO | |
658 | * @uid: User ID for debugfs files. Currently only 0 is supported. | |
659 | * @gid: Group ID for debugfs files. Currently only 0 is supported. | |
660 | * | |
661 | * Return: | |
662 | * - Handle for generated debug area | |
663 | * - %NULL if register failed | |
664 | * | |
665 | * Allocates memory for a debug log. | |
666 | * Must not be called within an interrupt handler. | |
1da177e4 | 667 | */ |
5cbbf16a | 668 | debug_info_t *debug_register_mode(const char *name, int pages_per_area, |
f4ae40a6 | 669 | int nr_areas, int buf_size, umode_t mode, |
5cbbf16a | 670 | uid_t uid, gid_t gid) |
1da177e4 LT |
671 | { |
672 | debug_info_t *rc = NULL; | |
673 | ||
9637c3f3 MH |
674 | /* Since debugfs currently does not support uid/gid other than root, */ |
675 | /* we do not allow gid/uid != 0 until we get support for that. */ | |
676 | if ((uid != 0) || (gid != 0)) | |
baebc70a | 677 | pr_warn("Root becomes the owner of all s390dbf files in sysfs\n"); |
6aa0d3a9 | 678 | BUG_ON(!initialized); |
e11f0d04 | 679 | mutex_lock(&debug_mutex); |
1da177e4 | 680 | |
496da0d7 | 681 | /* create new debug_info */ |
9637c3f3 | 682 | rc = debug_info_create(name, pages_per_area, nr_areas, buf_size, mode); |
496da0d7 | 683 | if (!rc) |
1da177e4 LT |
684 | goto out; |
685 | debug_register_view(rc, &debug_level_view); | |
496da0d7 | 686 | debug_register_view(rc, &debug_flush_view); |
66a464db MH |
687 | debug_register_view(rc, &debug_pages_view); |
688 | out: | |
496da0d7 | 689 | if (!rc) |
c5612c19 | 690 | pr_err("Registering debug feature %s failed\n", name); |
e11f0d04 | 691 | mutex_unlock(&debug_mutex); |
1da177e4 LT |
692 | return rc; |
693 | } | |
9637c3f3 MH |
694 | EXPORT_SYMBOL(debug_register_mode); |
695 | ||
0328e519 SM |
696 | /** |
697 | * debug_register() - creates and initializes debug area with default file mode. | |
698 | * | |
699 | * @name: Name of debug log (e.g. used for debugfs entry) | |
700 | * @pages_per_area: Number of pages, which will be allocated per area | |
701 | * @nr_areas: Number of debug areas | |
702 | * @buf_size: Size of data area in each debug entry | |
703 | * | |
704 | * Return: | |
705 | * - Handle for generated debug area | |
706 | * - %NULL if register failed | |
707 | * | |
708 | * Allocates memory for a debug log. | |
709 | * The debugfs file mode access permissions are read and write for user. | |
710 | * Must not be called within an interrupt handler. | |
9637c3f3 | 711 | */ |
5cbbf16a CH |
712 | debug_info_t *debug_register(const char *name, int pages_per_area, |
713 | int nr_areas, int buf_size) | |
9637c3f3 MH |
714 | { |
715 | return debug_register_mode(name, pages_per_area, nr_areas, buf_size, | |
716 | S_IRUSR | S_IWUSR, 0, 0); | |
717 | } | |
d5274369 | 718 | EXPORT_SYMBOL(debug_register); |
1da177e4 | 719 | |
0328e519 SM |
720 | /** |
721 | * debug_unregister() - give back debug area. | |
722 | * | |
723 | * @id: handle for debug log | |
724 | * | |
725 | * Return: | |
726 | * none | |
1da177e4 | 727 | */ |
496da0d7 | 728 | void debug_unregister(debug_info_t *id) |
1da177e4 LT |
729 | { |
730 | if (!id) | |
496da0d7 | 731 | return; |
e11f0d04 | 732 | mutex_lock(&debug_mutex); |
1da177e4 | 733 | debug_info_put(id); |
e11f0d04 | 734 | mutex_unlock(&debug_mutex); |
1da177e4 | 735 | } |
d5274369 | 736 | EXPORT_SYMBOL(debug_unregister); |
1da177e4 | 737 | |
66a464db MH |
738 | /* |
739 | * debug_set_size: | |
740 | * - set area size (number of pages) and number of areas | |
741 | */ | |
496da0d7 | 742 | static int debug_set_size(debug_info_t *id, int nr_areas, int pages_per_area) |
66a464db | 743 | { |
496da0d7 | 744 | debug_entry_t ***new_areas; |
66a464db | 745 | unsigned long flags; |
496da0d7 | 746 | int rc = 0; |
66a464db | 747 | |
496da0d7 | 748 | if (!id || (nr_areas <= 0) || (pages_per_area < 0)) |
66a464db | 749 | return -EINVAL; |
496da0d7 | 750 | if (pages_per_area > 0) { |
66a464db | 751 | new_areas = debug_areas_alloc(pages_per_area, nr_areas); |
496da0d7 | 752 | if (!new_areas) { |
c5612c19 MH |
753 | pr_info("Allocating memory for %i pages failed\n", |
754 | pages_per_area); | |
66a464db MH |
755 | rc = -ENOMEM; |
756 | goto out; | |
757 | } | |
758 | } else { | |
759 | new_areas = NULL; | |
760 | } | |
496da0d7 | 761 | spin_lock_irqsave(&id->lock, flags); |
66a464db MH |
762 | debug_areas_free(id); |
763 | id->areas = new_areas; | |
764 | id->nr_areas = nr_areas; | |
765 | id->pages_per_area = pages_per_area; | |
766 | id->active_area = 0; | |
496da0d7 | 767 | memset(id->active_entries, 0, sizeof(int)*id->nr_areas); |
66a464db | 768 | memset(id->active_pages, 0, sizeof(int)*id->nr_areas); |
496da0d7 HC |
769 | spin_unlock_irqrestore(&id->lock, flags); |
770 | pr_info("%s: set new size (%i pages)\n", id->name, pages_per_area); | |
66a464db MH |
771 | out: |
772 | return rc; | |
773 | } | |
774 | ||
0328e519 SM |
775 | /** |
776 | * debug_set_level() - Sets new actual debug level if new_level is valid. | |
777 | * | |
778 | * @id: handle for debug log | |
779 | * @new_level: new debug level | |
780 | * | |
781 | * Return: | |
782 | * none | |
1da177e4 | 783 | */ |
496da0d7 | 784 | void debug_set_level(debug_info_t *id, int new_level) |
1da177e4 LT |
785 | { |
786 | unsigned long flags; | |
496da0d7 HC |
787 | |
788 | if (!id) | |
789 | return; | |
790 | spin_lock_irqsave(&id->lock, flags); | |
791 | if (new_level == DEBUG_OFF_LEVEL) { | |
792 | id->level = DEBUG_OFF_LEVEL; | |
793 | pr_info("%s: switched off\n", id->name); | |
794 | } else if ((new_level > DEBUG_MAX_LEVEL) || (new_level < 0)) { | |
c5612c19 | 795 | pr_info("%s: level %i is out of range (%i - %i)\n", |
496da0d7 HC |
796 | id->name, new_level, 0, DEBUG_MAX_LEVEL); |
797 | } else { | |
798 | id->level = new_level; | |
799 | } | |
800 | spin_unlock_irqrestore(&id->lock, flags); | |
1da177e4 | 801 | } |
d5274369 | 802 | EXPORT_SYMBOL(debug_set_level); |
1da177e4 LT |
803 | |
804 | /* | |
805 | * proceed_active_entry: | |
806 | * - set active entry to next in the ring buffer | |
807 | */ | |
496da0d7 | 808 | static inline void proceed_active_entry(debug_info_t *id) |
1da177e4 | 809 | { |
66a464db | 810 | if ((id->active_entries[id->active_area] += id->entry_size) |
496da0d7 | 811 | > (PAGE_SIZE - id->entry_size)) { |
66a464db MH |
812 | id->active_entries[id->active_area] = 0; |
813 | id->active_pages[id->active_area] = | |
814 | (id->active_pages[id->active_area] + 1) % | |
815 | id->pages_per_area; | |
816 | } | |
1da177e4 LT |
817 | } |
818 | ||
819 | /* | |
820 | * proceed_active_area: | |
821 | * - set active area to next in the ring buffer | |
822 | */ | |
496da0d7 | 823 | static inline void proceed_active_area(debug_info_t *id) |
1da177e4 LT |
824 | { |
825 | id->active_area++; | |
826 | id->active_area = id->active_area % id->nr_areas; | |
827 | } | |
828 | ||
829 | /* | |
830 | * get_active_entry: | |
831 | */ | |
496da0d7 | 832 | static inline debug_entry_t *get_active_entry(debug_info_t *id) |
1da177e4 | 833 | { |
66a464db | 834 | return (debug_entry_t *) (((char *) id->areas[id->active_area] |
496da0d7 HC |
835 | [id->active_pages[id->active_area]]) + |
836 | id->active_entries[id->active_area]); | |
1da177e4 LT |
837 | } |
838 | ||
839 | /* | |
840 | * debug_finish_entry: | |
841 | * - set timestamp, caller address, cpu number etc. | |
842 | */ | |
843 | ||
496da0d7 HC |
844 | static inline void debug_finish_entry(debug_info_t *id, debug_entry_t *active, |
845 | int level, int exception) | |
1da177e4 | 846 | { |
6e2ef5e4 MS |
847 | active->id.stck = get_tod_clock_fast() - |
848 | *(unsigned long long *) &tod_clock_base[1]; | |
1da177e4 LT |
849 | active->id.fields.cpuid = smp_processor_id(); |
850 | active->caller = __builtin_return_address(0); | |
851 | active->id.fields.exception = exception; | |
496da0d7 | 852 | active->id.fields.level = level; |
1da177e4 | 853 | proceed_active_entry(id); |
496da0d7 | 854 | if (exception) |
1da177e4 LT |
855 | proceed_active_area(id); |
856 | } | |
857 | ||
496da0d7 HC |
858 | static int debug_stoppable = 1; |
859 | static int debug_active = 1; | |
1da177e4 | 860 | |
1da177e4 LT |
861 | #define CTL_S390DBF_STOPPABLE 5678 |
862 | #define CTL_S390DBF_ACTIVE 5679 | |
863 | ||
864 | /* | |
865 | * proc handler for the running debug_active sysctl | |
866 | * always allow read, allow write only if debug_stoppable is set or | |
867 | * if debug_active is already off | |
868 | */ | |
496da0d7 HC |
869 | static int s390dbf_procactive(struct ctl_table *table, int write, |
870 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1da177e4 LT |
871 | { |
872 | if (!write || debug_stoppable || !debug_active) | |
8d65af78 | 873 | return proc_dointvec(table, write, buffer, lenp, ppos); |
1da177e4 LT |
874 | else |
875 | return 0; | |
876 | } | |
877 | ||
1da177e4 LT |
878 | static struct ctl_table s390dbf_table[] = { |
879 | { | |
496da0d7 | 880 | .procname = "debug_stoppable", |
1da177e4 LT |
881 | .data = &debug_stoppable, |
882 | .maxlen = sizeof(int), | |
496da0d7 HC |
883 | .mode = S_IRUGO | S_IWUSR, |
884 | .proc_handler = proc_dointvec, | |
1da177e4 | 885 | }, |
496da0d7 HC |
886 | { |
887 | .procname = "debug_active", | |
1da177e4 LT |
888 | .data = &debug_active, |
889 | .maxlen = sizeof(int), | |
496da0d7 HC |
890 | .mode = S_IRUGO | S_IWUSR, |
891 | .proc_handler = s390dbf_procactive, | |
1da177e4 | 892 | }, |
b05fd35d | 893 | { } |
1da177e4 LT |
894 | }; |
895 | ||
896 | static struct ctl_table s390dbf_dir_table[] = { | |
897 | { | |
496da0d7 HC |
898 | .procname = "s390dbf", |
899 | .maxlen = 0, | |
900 | .mode = S_IRUGO | S_IXUGO, | |
901 | .child = s390dbf_table, | |
1da177e4 | 902 | }, |
b05fd35d | 903 | { } |
1da177e4 LT |
904 | }; |
905 | ||
2b67fc46 | 906 | static struct ctl_table_header *s390dbf_sysctl_header; |
1da177e4 | 907 | |
0328e519 SM |
908 | /** |
909 | * debug_stop_all() - stops the debug feature if stopping is allowed. | |
910 | * | |
911 | * Return: | |
912 | * - none | |
913 | * | |
914 | * Currently used in case of a kernel oops. | |
915 | */ | |
496da0d7 | 916 | void debug_stop_all(void) |
1da177e4 LT |
917 | { |
918 | if (debug_stoppable) | |
919 | debug_active = 0; | |
920 | } | |
d5274369 | 921 | EXPORT_SYMBOL(debug_stop_all); |
1da177e4 | 922 | |
0328e519 SM |
923 | /** |
924 | * debug_set_critical() - event/exception functions try lock instead of spin. | |
925 | * | |
926 | * Return: | |
927 | * - none | |
928 | * | |
929 | * Currently used in case of stopping all CPUs but the current one. | |
930 | * Once in this state, functions to write a debug entry for an | |
931 | * event or exception no longer spin on the debug area lock, | |
932 | * but only try to get it and fail if they do not get the lock. | |
933 | */ | |
3ab121ab MH |
934 | void debug_set_critical(void) |
935 | { | |
936 | debug_critical = 1; | |
937 | } | |
938 | ||
1da177e4 LT |
939 | /* |
940 | * debug_event_common: | |
941 | * - write debug entry with given size | |
942 | */ | |
496da0d7 HC |
943 | debug_entry_t *debug_event_common(debug_info_t *id, int level, const void *buf, |
944 | int len) | |
1da177e4 | 945 | { |
1da177e4 | 946 | debug_entry_t *active; |
496da0d7 | 947 | unsigned long flags; |
1da177e4 | 948 | |
66a464db | 949 | if (!debug_active || !id->areas) |
1da177e4 | 950 | return NULL; |
3ab121ab MH |
951 | if (debug_critical) { |
952 | if (!spin_trylock_irqsave(&id->lock, flags)) | |
953 | return NULL; | |
496da0d7 | 954 | } else { |
3ab121ab | 955 | spin_lock_irqsave(&id->lock, flags); |
496da0d7 | 956 | } |
94158e54 SO |
957 | do { |
958 | active = get_active_entry(id); | |
94158e54 | 959 | memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size)); |
0dcd91a9 SO |
960 | if (len < id->buf_size) |
961 | memset((DEBUG_DATA(active)) + len, 0, id->buf_size - len); | |
94158e54 SO |
962 | debug_finish_entry(id, active, level, 0); |
963 | len -= id->buf_size; | |
964 | buf += id->buf_size; | |
965 | } while (len > 0); | |
1da177e4 | 966 | |
94158e54 | 967 | spin_unlock_irqrestore(&id->lock, flags); |
1da177e4 LT |
968 | return active; |
969 | } | |
d5274369 | 970 | EXPORT_SYMBOL(debug_event_common); |
1da177e4 LT |
971 | |
972 | /* | |
973 | * debug_exception_common: | |
974 | * - write debug entry with given size and switch to next debug area | |
975 | */ | |
496da0d7 HC |
976 | debug_entry_t *debug_exception_common(debug_info_t *id, int level, |
977 | const void *buf, int len) | |
1da177e4 | 978 | { |
1da177e4 | 979 | debug_entry_t *active; |
496da0d7 | 980 | unsigned long flags; |
1da177e4 | 981 | |
66a464db | 982 | if (!debug_active || !id->areas) |
1da177e4 | 983 | return NULL; |
3ab121ab MH |
984 | if (debug_critical) { |
985 | if (!spin_trylock_irqsave(&id->lock, flags)) | |
986 | return NULL; | |
496da0d7 | 987 | } else { |
3ab121ab | 988 | spin_lock_irqsave(&id->lock, flags); |
496da0d7 | 989 | } |
94158e54 SO |
990 | do { |
991 | active = get_active_entry(id); | |
94158e54 | 992 | memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size)); |
0dcd91a9 SO |
993 | if (len < id->buf_size) |
994 | memset((DEBUG_DATA(active)) + len, 0, id->buf_size - len); | |
94158e54 SO |
995 | debug_finish_entry(id, active, level, len <= id->buf_size); |
996 | len -= id->buf_size; | |
997 | buf += id->buf_size; | |
998 | } while (len > 0); | |
1da177e4 | 999 | |
94158e54 | 1000 | spin_unlock_irqrestore(&id->lock, flags); |
1da177e4 LT |
1001 | return active; |
1002 | } | |
d5274369 | 1003 | EXPORT_SYMBOL(debug_exception_common); |
1da177e4 LT |
1004 | |
1005 | /* | |
1006 | * counts arguments in format string for sprintf view | |
1007 | */ | |
496da0d7 | 1008 | static inline int debug_count_numargs(char *string) |
1da177e4 | 1009 | { |
496da0d7 | 1010 | int numargs = 0; |
1da177e4 | 1011 | |
496da0d7 HC |
1012 | while (*string) { |
1013 | if (*string++ == '%') | |
1da177e4 LT |
1014 | numargs++; |
1015 | } | |
496da0d7 | 1016 | return numargs; |
1da177e4 LT |
1017 | } |
1018 | ||
1019 | /* | |
1020 | * debug_sprintf_event: | |
1021 | */ | |
496da0d7 | 1022 | debug_entry_t *__debug_sprintf_event(debug_info_t *id, int level, char *string, ...) |
1da177e4 | 1023 | { |
1da177e4 LT |
1024 | debug_sprintf_entry_t *curr_event; |
1025 | debug_entry_t *active; | |
496da0d7 HC |
1026 | unsigned long flags; |
1027 | int numargs, idx; | |
1028 | va_list ap; | |
1da177e4 | 1029 | |
66a464db | 1030 | if (!debug_active || !id->areas) |
1da177e4 | 1031 | return NULL; |
496da0d7 | 1032 | numargs = debug_count_numargs(string); |
1da177e4 | 1033 | |
3ab121ab MH |
1034 | if (debug_critical) { |
1035 | if (!spin_trylock_irqsave(&id->lock, flags)) | |
1036 | return NULL; | |
496da0d7 | 1037 | } else { |
3ab121ab | 1038 | spin_lock_irqsave(&id->lock, flags); |
496da0d7 | 1039 | } |
1da177e4 | 1040 | active = get_active_entry(id); |
496da0d7 HC |
1041 | curr_event = (debug_sprintf_entry_t *) DEBUG_DATA(active); |
1042 | va_start(ap, string); | |
1043 | curr_event->string = string; | |
1044 | for (idx = 0; idx < min(numargs, (int)(id->buf_size / sizeof(long)) - 1); idx++) | |
1045 | curr_event->args[idx] = va_arg(ap, long); | |
1da177e4 LT |
1046 | va_end(ap); |
1047 | debug_finish_entry(id, active, level, 0); | |
1048 | spin_unlock_irqrestore(&id->lock, flags); | |
1049 | ||
1050 | return active; | |
1051 | } | |
832a7710 | 1052 | EXPORT_SYMBOL(__debug_sprintf_event); |
1da177e4 LT |
1053 | |
1054 | /* | |
1055 | * debug_sprintf_exception: | |
1056 | */ | |
496da0d7 | 1057 | debug_entry_t *__debug_sprintf_exception(debug_info_t *id, int level, char *string, ...) |
1da177e4 | 1058 | { |
1da177e4 LT |
1059 | debug_sprintf_entry_t *curr_event; |
1060 | debug_entry_t *active; | |
496da0d7 HC |
1061 | unsigned long flags; |
1062 | int numargs, idx; | |
1063 | va_list ap; | |
1da177e4 | 1064 | |
66a464db | 1065 | if (!debug_active || !id->areas) |
1da177e4 LT |
1066 | return NULL; |
1067 | ||
496da0d7 | 1068 | numargs = debug_count_numargs(string); |
1da177e4 | 1069 | |
3ab121ab MH |
1070 | if (debug_critical) { |
1071 | if (!spin_trylock_irqsave(&id->lock, flags)) | |
1072 | return NULL; | |
496da0d7 | 1073 | } else { |
3ab121ab | 1074 | spin_lock_irqsave(&id->lock, flags); |
496da0d7 | 1075 | } |
1da177e4 | 1076 | active = get_active_entry(id); |
496da0d7 HC |
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); | |
1da177e4 LT |
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 | 1089 | |
0328e519 SM |
1090 | /** |
1091 | * debug_register_view() - registers new debug view and creates debugfs | |
1092 | * dir entry | |
1093 | * | |
1094 | * @id: handle for debug log | |
1095 | * @view: pointer to debug view struct | |
1096 | * | |
1097 | * Return: | |
1098 | * - 0 : ok | |
1099 | * - < 0: Error | |
1da177e4 | 1100 | */ |
496da0d7 | 1101 | int debug_register_view(debug_info_t *id, struct debug_view *view) |
1da177e4 | 1102 | { |
1da177e4 | 1103 | unsigned long flags; |
66a464db | 1104 | struct dentry *pde; |
496da0d7 HC |
1105 | umode_t mode; |
1106 | int rc = 0; | |
1107 | int i; | |
1da177e4 LT |
1108 | |
1109 | if (!id) | |
1110 | goto out; | |
9637c3f3 MH |
1111 | mode = (id->mode | S_IFREG) & ~S_IXUGO; |
1112 | if (!(view->prolog_proc || view->format_proc || view->header_proc)) | |
1113 | mode &= ~(S_IRUSR | S_IRGRP | S_IROTH); | |
1114 | if (!view->input_proc) | |
1115 | mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH); | |
66a464db | 1116 | pde = debugfs_create_file(view->name, mode, id->debugfs_root_entry, |
496da0d7 | 1117 | id, &debug_file_ops); |
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 | 1138 | |
0328e519 SM |
1139 | /** |
1140 | * debug_unregister_view() - unregisters debug view and removes debugfs | |
1141 | * dir entry | |
1142 | * | |
1143 | * @id: handle for debug log | |
1144 | * @view: pointer to debug view struct | |
1145 | * | |
1146 | * Return: | |
1147 | * - 0 : ok | |
1148 | * - < 0: Error | |
1da177e4 | 1149 | */ |
496da0d7 | 1150 | int debug_unregister_view(debug_info_t *id, struct debug_view *view) |
1da177e4 | 1151 | { |
5a334c08 | 1152 | struct dentry *dentry = NULL; |
1da177e4 | 1153 | unsigned long flags; |
5a334c08 | 1154 | int i, rc = 0; |
1da177e4 LT |
1155 | |
1156 | if (!id) | |
1157 | goto out; | |
1158 | spin_lock_irqsave(&id->lock, flags); | |
1159 | for (i = 0; i < DEBUG_MAX_VIEWS; i++) { | |
1160 | if (id->views[i] == view) | |
1161 | break; | |
1162 | } | |
496da0d7 | 1163 | if (i == DEBUG_MAX_VIEWS) { |
1da177e4 | 1164 | rc = -1; |
496da0d7 | 1165 | } else { |
5a334c08 | 1166 | dentry = id->debugfs_entries[i]; |
1da177e4 | 1167 | id->views[i] = NULL; |
5a334c08 | 1168 | id->debugfs_entries[i] = NULL; |
1da177e4 LT |
1169 | } |
1170 | spin_unlock_irqrestore(&id->lock, flags); | |
5a334c08 | 1171 | debugfs_remove(dentry); |
66a464db MH |
1172 | out: |
1173 | return rc; | |
1174 | } | |
d5274369 | 1175 | EXPORT_SYMBOL(debug_unregister_view); |
66a464db | 1176 | |
496da0d7 HC |
1177 | static inline char *debug_get_user_string(const char __user *user_buf, |
1178 | size_t user_len) | |
66a464db | 1179 | { |
496da0d7 | 1180 | char *buffer; |
66a464db MH |
1181 | |
1182 | buffer = kmalloc(user_len + 1, GFP_KERNEL); | |
1183 | if (!buffer) | |
1184 | return ERR_PTR(-ENOMEM); | |
1185 | if (copy_from_user(buffer, user_buf, user_len) != 0) { | |
1186 | kfree(buffer); | |
1187 | return ERR_PTR(-EFAULT); | |
1188 | } | |
1189 | /* got the string, now strip linefeed. */ | |
1190 | if (buffer[user_len - 1] == '\n') | |
1191 | buffer[user_len - 1] = 0; | |
1192 | else | |
1193 | buffer[user_len] = 0; | |
496da0d7 | 1194 | return buffer; |
66a464db MH |
1195 | } |
1196 | ||
496da0d7 | 1197 | static inline int debug_get_uint(char *buf) |
66a464db MH |
1198 | { |
1199 | int rc; | |
1200 | ||
e7d2860b | 1201 | buf = skip_spaces(buf); |
66a464db | 1202 | rc = simple_strtoul(buf, &buf, 10); |
496da0d7 | 1203 | if (*buf) |
66a464db | 1204 | rc = -EINVAL; |
1da177e4 LT |
1205 | return rc; |
1206 | } | |
1207 | ||
1208 | /* | |
1209 | * functions for debug-views | |
1210 | *********************************** | |
1211 | */ | |
1212 | ||
1213 | /* | |
1214 | * prints out actual debug level | |
1215 | */ | |
1216 | ||
496da0d7 HC |
1217 | static int debug_prolog_pages_fn(debug_info_t *id, struct debug_view *view, |
1218 | char *out_buf) | |
66a464db MH |
1219 | { |
1220 | return sprintf(out_buf, "%i\n", id->pages_per_area); | |
1221 | } | |
1222 | ||
1223 | /* | |
1224 | * reads new size (number of pages per debug area) | |
1225 | */ | |
1226 | ||
496da0d7 HC |
1227 | static int debug_input_pages_fn(debug_info_t *id, struct debug_view *view, |
1228 | struct file *file, const char __user *user_buf, | |
1229 | size_t user_len, loff_t *offset) | |
66a464db | 1230 | { |
496da0d7 | 1231 | int rc, new_pages; |
66a464db | 1232 | char *str; |
66a464db MH |
1233 | |
1234 | if (user_len > 0x10000) | |
496da0d7 HC |
1235 | user_len = 0x10000; |
1236 | if (*offset != 0) { | |
66a464db MH |
1237 | rc = -EPIPE; |
1238 | goto out; | |
1239 | } | |
496da0d7 HC |
1240 | str = debug_get_user_string(user_buf, user_len); |
1241 | if (IS_ERR(str)) { | |
66a464db MH |
1242 | rc = PTR_ERR(str); |
1243 | goto out; | |
1244 | } | |
1245 | new_pages = debug_get_uint(str); | |
496da0d7 | 1246 | if (new_pages < 0) { |
66a464db MH |
1247 | rc = -EINVAL; |
1248 | goto free_str; | |
1249 | } | |
496da0d7 HC |
1250 | rc = debug_set_size(id, id->nr_areas, new_pages); |
1251 | if (rc != 0) { | |
66a464db MH |
1252 | rc = -EINVAL; |
1253 | goto free_str; | |
1254 | } | |
1255 | rc = user_len; | |
1256 | free_str: | |
1257 | kfree(str); | |
1258 | out: | |
1259 | *offset += user_len; | |
1260 | return rc; /* number of input characters */ | |
1261 | } | |
1262 | ||
1263 | /* | |
1264 | * prints out actual debug level | |
1265 | */ | |
496da0d7 HC |
1266 | static int debug_prolog_level_fn(debug_info_t *id, struct debug_view *view, |
1267 | char *out_buf) | |
1da177e4 LT |
1268 | { |
1269 | int rc = 0; | |
1270 | ||
496da0d7 HC |
1271 | if (id->level == DEBUG_OFF_LEVEL) |
1272 | rc = sprintf(out_buf, "-\n"); | |
1273 | else | |
66a464db | 1274 | rc = sprintf(out_buf, "%i\n", id->level); |
1da177e4 LT |
1275 | return rc; |
1276 | } | |
1277 | ||
1278 | /* | |
1279 | * reads new debug level | |
1280 | */ | |
496da0d7 HC |
1281 | static int debug_input_level_fn(debug_info_t *id, struct debug_view *view, |
1282 | struct file *file, const char __user *user_buf, | |
1283 | size_t user_len, loff_t *offset) | |
1da177e4 | 1284 | { |
496da0d7 | 1285 | int rc, new_level; |
66a464db | 1286 | char *str; |
1da177e4 | 1287 | |
66a464db | 1288 | if (user_len > 0x10000) |
496da0d7 HC |
1289 | user_len = 0x10000; |
1290 | if (*offset != 0) { | |
66a464db | 1291 | rc = -EPIPE; |
1da177e4 | 1292 | goto out; |
66a464db | 1293 | } |
496da0d7 HC |
1294 | str = debug_get_user_string(user_buf, user_len); |
1295 | if (IS_ERR(str)) { | |
66a464db | 1296 | rc = PTR_ERR(str); |
1da177e4 LT |
1297 | goto out; |
1298 | } | |
496da0d7 | 1299 | if (str[0] == '-') { |
1da177e4 | 1300 | debug_set_level(id, DEBUG_OFF_LEVEL); |
66a464db MH |
1301 | rc = user_len; |
1302 | goto free_str; | |
1da177e4 | 1303 | } else { |
66a464db | 1304 | new_level = debug_get_uint(str); |
1da177e4 | 1305 | } |
496da0d7 | 1306 | if (new_level < 0) { |
baebc70a | 1307 | pr_warn("%s is not a valid level for a debug feature\n", str); |
66a464db MH |
1308 | rc = -EINVAL; |
1309 | } else { | |
1310 | debug_set_level(id, new_level); | |
1311 | rc = user_len; | |
1312 | } | |
1313 | free_str: | |
1314 | kfree(str); | |
1315 | out: | |
1316 | *offset += user_len; | |
1da177e4 LT |
1317 | return rc; /* number of input characters */ |
1318 | } | |
1319 | ||
1da177e4 LT |
1320 | /* |
1321 | * flushes debug areas | |
1322 | */ | |
496da0d7 | 1323 | static void debug_flush(debug_info_t *id, int area) |
1da177e4 | 1324 | { |
496da0d7 HC |
1325 | unsigned long flags; |
1326 | int i, j; | |
1327 | ||
1328 | if (!id || !id->areas) | |
1329 | return; | |
1330 | spin_lock_irqsave(&id->lock, flags); | |
1331 | if (area == DEBUG_FLUSH_ALL) { | |
1332 | id->active_area = 0; | |
1333 | memset(id->active_entries, 0, id->nr_areas * sizeof(int)); | |
1334 | for (i = 0; i < id->nr_areas; i++) { | |
66a464db | 1335 | id->active_pages[i] = 0; |
496da0d7 HC |
1336 | for (j = 0; j < id->pages_per_area; j++) |
1337 | memset(id->areas[i][j], 0, PAGE_SIZE); | |
66a464db | 1338 | } |
496da0d7 HC |
1339 | } else if (area >= 0 && area < id->nr_areas) { |
1340 | id->active_entries[area] = 0; | |
66a464db | 1341 | id->active_pages[area] = 0; |
496da0d7 HC |
1342 | for (i = 0; i < id->pages_per_area; i++) |
1343 | memset(id->areas[area][i], 0, PAGE_SIZE); | |
1344 | } | |
1345 | spin_unlock_irqrestore(&id->lock, flags); | |
1da177e4 LT |
1346 | } |
1347 | ||
1348 | /* | |
496da0d7 | 1349 | * view function: flushes debug areas |
1da177e4 | 1350 | */ |
496da0d7 HC |
1351 | static int 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 | 1354 | { |
496da0d7 HC |
1355 | char input_buf[1]; |
1356 | int rc = user_len; | |
66a464db MH |
1357 | |
1358 | if (user_len > 0x10000) | |
496da0d7 HC |
1359 | user_len = 0x10000; |
1360 | if (*offset != 0) { | |
66a464db | 1361 | rc = -EPIPE; |
496da0d7 HC |
1362 | goto out; |
1363 | } | |
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 | ||
1375 | debug_flush(id, area); | |
1376 | goto out; | |
66a464db | 1377 | } |
1da177e4 | 1378 | |
c5612c19 MH |
1379 | pr_info("Flushing debug data failed because %c is not a valid " |
1380 | "area\n", input_buf[0]); | |
1da177e4 | 1381 | |
66a464db | 1382 | out: |
496da0d7 HC |
1383 | *offset += user_len; |
1384 | return rc; /* number of input characters */ | |
1da177e4 LT |
1385 | } |
1386 | ||
1387 | /* | |
1388 | * prints debug header in raw format | |
1389 | */ | |
496da0d7 HC |
1390 | static int debug_raw_header_fn(debug_info_t *id, struct debug_view *view, |
1391 | int area, debug_entry_t *entry, char *out_buf) | |
1da177e4 | 1392 | { |
496da0d7 | 1393 | int rc; |
1da177e4 LT |
1394 | |
1395 | rc = sizeof(debug_entry_t); | |
496da0d7 HC |
1396 | memcpy(out_buf, entry, sizeof(debug_entry_t)); |
1397 | return rc; | |
1da177e4 LT |
1398 | } |
1399 | ||
1400 | /* | |
1401 | * prints debug data in raw format | |
1402 | */ | |
496da0d7 | 1403 | static int debug_raw_format_fn(debug_info_t *id, struct debug_view *view, |
1da177e4 LT |
1404 | char *out_buf, const char *in_buf) |
1405 | { | |
1406 | int rc; | |
1407 | ||
1408 | rc = id->buf_size; | |
1409 | memcpy(out_buf, in_buf, id->buf_size); | |
1410 | return rc; | |
1411 | } | |
1412 | ||
1413 | /* | |
1414 | * prints debug data in hex/ascii format | |
1415 | */ | |
496da0d7 HC |
1416 | static int debug_hex_ascii_format_fn(debug_info_t *id, struct debug_view *view, |
1417 | char *out_buf, const char *in_buf) | |
1da177e4 LT |
1418 | { |
1419 | int i, rc = 0; | |
1420 | ||
496da0d7 HC |
1421 | for (i = 0; i < id->buf_size; i++) |
1422 | rc += sprintf(out_buf + rc, "%02x ", ((unsigned char *) in_buf)[i]); | |
1da177e4 LT |
1423 | rc += sprintf(out_buf + rc, "| "); |
1424 | for (i = 0; i < id->buf_size; i++) { | |
1425 | unsigned char c = in_buf[i]; | |
496da0d7 | 1426 | |
3ab121ab | 1427 | if (isascii(c) && isprint(c)) |
1da177e4 | 1428 | rc += sprintf(out_buf + rc, "%c", c); |
3ab121ab MH |
1429 | else |
1430 | rc += sprintf(out_buf + rc, "."); | |
1da177e4 LT |
1431 | } |
1432 | rc += sprintf(out_buf + rc, "\n"); | |
1433 | return rc; | |
1434 | } | |
1435 | ||
1436 | /* | |
1437 | * prints header for debug entry | |
1438 | */ | |
496da0d7 HC |
1439 | int debug_dflt_header_fn(debug_info_t *id, struct debug_view *view, |
1440 | int area, debug_entry_t *entry, char *out_buf) | |
1da177e4 | 1441 | { |
6e2ef5e4 | 1442 | unsigned long base, sec, usec; |
1da177e4 | 1443 | unsigned long caller; |
1da177e4 | 1444 | unsigned int level; |
496da0d7 HC |
1445 | char *except_str; |
1446 | int rc = 0; | |
1da177e4 LT |
1447 | |
1448 | level = entry->id.fields.level; | |
6e2ef5e4 MS |
1449 | base = (*(unsigned long *) &tod_clock_base[0]) >> 4; |
1450 | sec = (entry->id.stck >> 12) + base - (TOD_UNIX_EPOCH >> 12); | |
ea417aa8 | 1451 | usec = do_div(sec, USEC_PER_SEC); |
1da177e4 LT |
1452 | |
1453 | if (entry->id.fields.exception) | |
1454 | except_str = "*"; | |
1455 | else | |
1456 | except_str = "-"; | |
9cb1ccec | 1457 | caller = (unsigned long) entry->caller; |
860ec7c6 | 1458 | rc += sprintf(out_buf, "%02i %011ld:%06lu %1u %1s %02i %pK ", |
ea417aa8 | 1459 | area, sec, usec, level, except_str, |
689911c7 | 1460 | entry->id.fields.cpuid, (void *)caller); |
1da177e4 LT |
1461 | return rc; |
1462 | } | |
d5274369 | 1463 | EXPORT_SYMBOL(debug_dflt_header_fn); |
1da177e4 LT |
1464 | |
1465 | /* | |
1466 | * prints debug data sprintf-formated: | |
1467 | * debug_sprinf_event/exception calls must be used together with this view | |
1468 | */ | |
1469 | ||
1470 | #define DEBUG_SPRINTF_MAX_ARGS 10 | |
1471 | ||
496da0d7 HC |
1472 | static int debug_sprintf_format_fn(debug_info_t *id, struct debug_view *view, |
1473 | char *out_buf, debug_sprintf_entry_t *curr_event) | |
1da177e4 | 1474 | { |
496da0d7 | 1475 | int num_longs, num_used_args = 0, i, rc = 0; |
1da177e4 LT |
1476 | int index[DEBUG_SPRINTF_MAX_ARGS]; |
1477 | ||
1478 | /* count of longs fit into one entry */ | |
496da0d7 | 1479 | num_longs = id->buf_size / sizeof(long); |
1da177e4 | 1480 | |
496da0d7 | 1481 | if (num_longs < 1) |
1da177e4 | 1482 | goto out; /* bufsize of entry too small */ |
496da0d7 | 1483 | if (num_longs == 1) { |
1da177e4 LT |
1484 | /* no args, we use only the string */ |
1485 | strcpy(out_buf, curr_event->string); | |
1486 | rc = strlen(curr_event->string); | |
1487 | goto out; | |
1488 | } | |
1489 | ||
1490 | /* number of arguments used for sprintf (without the format string) */ | |
496da0d7 | 1491 | num_used_args = min(DEBUG_SPRINTF_MAX_ARGS, (num_longs - 1)); |
1da177e4 | 1492 | |
496da0d7 | 1493 | memset(index, 0, DEBUG_SPRINTF_MAX_ARGS * sizeof(int)); |
1da177e4 | 1494 | |
496da0d7 | 1495 | for (i = 0; i < num_used_args; i++) |
1da177e4 LT |
1496 | index[i] = i; |
1497 | ||
496da0d7 HC |
1498 | rc = sprintf(out_buf, curr_event->string, curr_event->args[index[0]], |
1499 | curr_event->args[index[1]], curr_event->args[index[2]], | |
1500 | curr_event->args[index[3]], curr_event->args[index[4]], | |
1501 | curr_event->args[index[5]], curr_event->args[index[6]], | |
1502 | curr_event->args[index[7]], curr_event->args[index[8]], | |
1503 | curr_event->args[index[9]]); | |
1da177e4 | 1504 | out: |
1da177e4 LT |
1505 | return rc; |
1506 | } | |
1507 | ||
1508 | /* | |
d5274369 HC |
1509 | * debug_init: |
1510 | * - is called exactly once to initialize the debug feature | |
1da177e4 | 1511 | */ |
d5274369 | 1512 | static int __init debug_init(void) |
1da177e4 | 1513 | { |
d5274369 HC |
1514 | s390dbf_sysctl_header = register_sysctl_table(s390dbf_dir_table); |
1515 | mutex_lock(&debug_mutex); | |
1516 | debug_debugfs_root_entry = debugfs_create_dir(DEBUG_DIR_ROOT, NULL); | |
1517 | initialized = 1; | |
1518 | mutex_unlock(&debug_mutex); | |
1519 | return 0; | |
1da177e4 | 1520 | } |
66a464db | 1521 | postcore_initcall(debug_init); |