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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 LT |
7 | * Author(s): Michael Holzheu (holzheu@de.ibm.com), |
8 | * Holger Smolinski (Holger.Smolinski@de.ibm.com) | |
9 | * | |
10 | * Bugreports to: <Linux390@de.ibm.com> | |
11 | */ | |
12 | ||
c5612c19 MH |
13 | #define KMSG_COMPONENT "s390dbf" |
14 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
15 | ||
1da177e4 LT |
16 | #include <linux/stddef.h> |
17 | #include <linux/kernel.h> | |
18 | #include <linux/errno.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/ctype.h> | |
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 */ | |
40 | int act_area; /* number of last formated area */ | |
66a464db | 41 | int act_page; /* act page in given area */ |
1da177e4 LT |
42 | int act_entry; /* last formated entry (offset */ |
43 | /* relative to beginning of last */ | |
66a464db | 44 | /* formated page) */ |
1da177e4 LT |
45 | size_t act_entry_offset; /* up to this offset we copied */ |
46 | /* in last read the last formated */ | |
47 | /* entry to userland */ | |
48 | char temp_buf[2048]; /* buffer for output */ | |
49 | debug_info_t *debug_info_org; /* original debug information */ | |
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 | ||
54 | typedef struct | |
55 | { | |
56 | char *string; | |
57 | /* | |
58 | * This assumes that all args are converted into longs | |
59 | * on L/390 this is the case for all types of parameter | |
60 | * except of floats, and long long (32 bit) | |
66a464db MH |
61 | * |
62 | */ | |
1da177e4 LT |
63 | long args[0]; |
64 | } debug_sprintf_entry_t; | |
65 | ||
66 | ||
1da177e4 LT |
67 | /* internal function prototyes */ |
68 | ||
69 | static int debug_init(void); | |
70 | static ssize_t debug_output(struct file *file, char __user *user_buf, | |
66a464db | 71 | size_t user_len, loff_t * offset); |
1da177e4 | 72 | static ssize_t debug_input(struct file *file, const char __user *user_buf, |
66a464db | 73 | size_t user_len, loff_t * offset); |
1da177e4 LT |
74 | static int debug_open(struct inode *inode, struct file *file); |
75 | static int debug_close(struct inode *inode, struct file *file); | |
5cbbf16a | 76 | static debug_info_t *debug_info_create(const char *name, int pages_per_area, |
f4ae40a6 | 77 | int nr_areas, int buf_size, umode_t mode); |
1da177e4 LT |
78 | static void debug_info_get(debug_info_t *); |
79 | static void debug_info_put(debug_info_t *); | |
80 | static int debug_prolog_level_fn(debug_info_t * id, | |
66a464db | 81 | struct debug_view *view, char *out_buf); |
1da177e4 | 82 | static int debug_input_level_fn(debug_info_t * id, struct debug_view *view, |
66a464db MH |
83 | struct file *file, const char __user *user_buf, |
84 | size_t user_buf_size, loff_t * offset); | |
85 | static int debug_prolog_pages_fn(debug_info_t * id, | |
86 | struct debug_view *view, char *out_buf); | |
87 | static int debug_input_pages_fn(debug_info_t * id, struct debug_view *view, | |
88 | struct file *file, const char __user *user_buf, | |
89 | size_t user_buf_size, loff_t * offset); | |
1da177e4 | 90 | static int debug_input_flush_fn(debug_info_t * id, struct debug_view *view, |
66a464db MH |
91 | struct file *file, const char __user *user_buf, |
92 | size_t user_buf_size, loff_t * offset); | |
1da177e4 | 93 | static int debug_hex_ascii_format_fn(debug_info_t * id, struct debug_view *view, |
66a464db | 94 | char *out_buf, const char *in_buf); |
1da177e4 | 95 | static int debug_raw_format_fn(debug_info_t * id, |
66a464db MH |
96 | struct debug_view *view, char *out_buf, |
97 | const char *in_buf); | |
1da177e4 | 98 | static int debug_raw_header_fn(debug_info_t * id, struct debug_view *view, |
66a464db | 99 | int area, debug_entry_t * entry, char *out_buf); |
1da177e4 LT |
100 | |
101 | static int debug_sprintf_format_fn(debug_info_t * id, struct debug_view *view, | |
66a464db | 102 | char *out_buf, debug_sprintf_entry_t *curr_event); |
1da177e4 LT |
103 | |
104 | /* globals */ | |
105 | ||
106 | struct debug_view debug_raw_view = { | |
107 | "raw", | |
108 | NULL, | |
109 | &debug_raw_header_fn, | |
110 | &debug_raw_format_fn, | |
111 | NULL, | |
112 | NULL | |
113 | }; | |
d5274369 | 114 | EXPORT_SYMBOL(debug_raw_view); |
1da177e4 LT |
115 | |
116 | struct debug_view debug_hex_ascii_view = { | |
117 | "hex_ascii", | |
118 | NULL, | |
119 | &debug_dflt_header_fn, | |
120 | &debug_hex_ascii_format_fn, | |
121 | NULL, | |
122 | NULL | |
123 | }; | |
d5274369 | 124 | EXPORT_SYMBOL(debug_hex_ascii_view); |
1da177e4 | 125 | |
2b67fc46 | 126 | static struct debug_view debug_level_view = { |
1da177e4 LT |
127 | "level", |
128 | &debug_prolog_level_fn, | |
129 | NULL, | |
130 | NULL, | |
131 | &debug_input_level_fn, | |
132 | NULL | |
133 | }; | |
134 | ||
2b67fc46 | 135 | static struct debug_view debug_pages_view = { |
66a464db MH |
136 | "pages", |
137 | &debug_prolog_pages_fn, | |
138 | NULL, | |
139 | NULL, | |
140 | &debug_input_pages_fn, | |
141 | NULL | |
142 | }; | |
143 | ||
2b67fc46 | 144 | static struct debug_view debug_flush_view = { |
1da177e4 LT |
145 | "flush", |
146 | NULL, | |
147 | NULL, | |
148 | NULL, | |
149 | &debug_input_flush_fn, | |
150 | NULL | |
151 | }; | |
152 | ||
153 | struct debug_view debug_sprintf_view = { | |
154 | "sprintf", | |
155 | NULL, | |
156 | &debug_dflt_header_fn, | |
157 | (debug_format_proc_t*)&debug_sprintf_format_fn, | |
158 | NULL, | |
159 | NULL | |
160 | }; | |
d5274369 | 161 | EXPORT_SYMBOL(debug_sprintf_view); |
1da177e4 | 162 | |
2b67fc46 | 163 | /* used by dump analysis tools to determine version of debug feature */ |
a806170e | 164 | static unsigned int __used debug_feature_version = __DEBUG_FEATURE_VERSION; |
1da177e4 LT |
165 | |
166 | /* static globals */ | |
167 | ||
168 | static debug_info_t *debug_area_first = NULL; | |
169 | static debug_info_t *debug_area_last = NULL; | |
e11f0d04 | 170 | static DEFINE_MUTEX(debug_mutex); |
1da177e4 LT |
171 | |
172 | static int initialized; | |
3ab121ab | 173 | static int debug_critical; |
1da177e4 | 174 | |
5dfe4c96 | 175 | static const struct file_operations debug_file_ops = { |
66a464db | 176 | .owner = THIS_MODULE, |
1da177e4 | 177 | .read = debug_output, |
66a464db | 178 | .write = debug_input, |
1da177e4 LT |
179 | .open = debug_open, |
180 | .release = debug_close, | |
6038f373 | 181 | .llseek = no_llseek, |
1da177e4 LT |
182 | }; |
183 | ||
66a464db | 184 | static struct dentry *debug_debugfs_root_entry; |
1da177e4 LT |
185 | |
186 | /* functions */ | |
187 | ||
66a464db MH |
188 | /* |
189 | * debug_areas_alloc | |
190 | * - Debug areas are implemented as a threedimensonal array: | |
191 | * areas[areanumber][pagenumber][pageoffset] | |
192 | */ | |
193 | ||
194 | static debug_entry_t*** | |
195 | debug_areas_alloc(int pages_per_area, int nr_areas) | |
196 | { | |
197 | debug_entry_t*** areas; | |
198 | int i,j; | |
199 | ||
5cbded58 | 200 | areas = kmalloc(nr_areas * |
66a464db MH |
201 | sizeof(debug_entry_t**), |
202 | GFP_KERNEL); | |
203 | if (!areas) | |
204 | goto fail_malloc_areas; | |
205 | for (i = 0; i < nr_areas; i++) { | |
5cbded58 | 206 | areas[i] = kmalloc(pages_per_area * |
66a464db MH |
207 | sizeof(debug_entry_t*),GFP_KERNEL); |
208 | if (!areas[i]) { | |
209 | goto fail_malloc_areas2; | |
210 | } | |
211 | for(j = 0; j < pages_per_area; j++) { | |
fb630517 | 212 | areas[i][j] = kzalloc(PAGE_SIZE, GFP_KERNEL); |
66a464db MH |
213 | if(!areas[i][j]) { |
214 | for(j--; j >=0 ; j--) { | |
215 | kfree(areas[i][j]); | |
216 | } | |
217 | kfree(areas[i]); | |
218 | goto fail_malloc_areas2; | |
66a464db MH |
219 | } |
220 | } | |
221 | } | |
222 | return areas; | |
223 | ||
224 | fail_malloc_areas2: | |
225 | for(i--; i >= 0; i--){ | |
226 | for(j=0; j < pages_per_area;j++){ | |
227 | kfree(areas[i][j]); | |
228 | } | |
229 | kfree(areas[i]); | |
230 | } | |
231 | kfree(areas); | |
232 | fail_malloc_areas: | |
233 | return NULL; | |
234 | ||
235 | } | |
236 | ||
237 | ||
1da177e4 LT |
238 | /* |
239 | * debug_info_alloc | |
240 | * - alloc new debug-info | |
241 | */ | |
242 | ||
66a464db | 243 | static debug_info_t* |
5cbbf16a CH |
244 | debug_info_alloc(const char *name, int pages_per_area, int nr_areas, |
245 | int buf_size, int level, int mode) | |
1da177e4 LT |
246 | { |
247 | debug_info_t* rc; | |
1da177e4 LT |
248 | |
249 | /* alloc everything */ | |
250 | ||
5cbded58 | 251 | rc = kmalloc(sizeof(debug_info_t), GFP_KERNEL); |
1da177e4 LT |
252 | if(!rc) |
253 | goto fail_malloc_rc; | |
fb630517 | 254 | rc->active_entries = kcalloc(nr_areas, sizeof(int), GFP_KERNEL); |
66a464db MH |
255 | if(!rc->active_entries) |
256 | goto fail_malloc_active_entries; | |
fb630517 | 257 | rc->active_pages = kcalloc(nr_areas, sizeof(int), GFP_KERNEL); |
66a464db MH |
258 | if(!rc->active_pages) |
259 | goto fail_malloc_active_pages; | |
66a464db MH |
260 | if((mode == ALL_AREAS) && (pages_per_area != 0)){ |
261 | rc->areas = debug_areas_alloc(pages_per_area, nr_areas); | |
262 | if(!rc->areas) | |
263 | goto fail_malloc_areas; | |
264 | } else { | |
265 | rc->areas = NULL; | |
1da177e4 LT |
266 | } |
267 | ||
268 | /* initialize members */ | |
269 | ||
270 | spin_lock_init(&rc->lock); | |
66a464db MH |
271 | rc->pages_per_area = pages_per_area; |
272 | rc->nr_areas = nr_areas; | |
273 | rc->active_area = 0; | |
274 | rc->level = level; | |
275 | rc->buf_size = buf_size; | |
276 | rc->entry_size = sizeof(debug_entry_t) + buf_size; | |
20cb9e79 | 277 | strlcpy(rc->name, name, sizeof(rc->name)); |
1da177e4 | 278 | memset(rc->views, 0, DEBUG_MAX_VIEWS * sizeof(struct debug_view *)); |
66a464db MH |
279 | memset(rc->debugfs_entries, 0 ,DEBUG_MAX_VIEWS * |
280 | sizeof(struct dentry*)); | |
efc0c21c | 281 | refcount_set(&(rc->ref_count), 0); |
1da177e4 LT |
282 | |
283 | return rc; | |
284 | ||
1da177e4 | 285 | fail_malloc_areas: |
66a464db MH |
286 | kfree(rc->active_pages); |
287 | fail_malloc_active_pages: | |
288 | kfree(rc->active_entries); | |
289 | fail_malloc_active_entries: | |
1da177e4 LT |
290 | kfree(rc); |
291 | fail_malloc_rc: | |
292 | return NULL; | |
293 | } | |
294 | ||
295 | /* | |
66a464db MH |
296 | * debug_areas_free |
297 | * - free all debug areas | |
1da177e4 LT |
298 | */ |
299 | ||
66a464db MH |
300 | static void |
301 | debug_areas_free(debug_info_t* db_info) | |
302 | { | |
303 | int i,j; | |
304 | ||
305 | if(!db_info->areas) | |
306 | return; | |
1da177e4 | 307 | for (i = 0; i < db_info->nr_areas; i++) { |
66a464db MH |
308 | for(j = 0; j < db_info->pages_per_area; j++) { |
309 | kfree(db_info->areas[i][j]); | |
310 | } | |
311 | kfree(db_info->areas[i]); | |
1da177e4 LT |
312 | } |
313 | kfree(db_info->areas); | |
66a464db MH |
314 | db_info->areas = NULL; |
315 | } | |
316 | ||
317 | /* | |
318 | * debug_info_free | |
319 | * - free memory debug-info | |
320 | */ | |
321 | ||
322 | static void | |
323 | debug_info_free(debug_info_t* db_info){ | |
324 | debug_areas_free(db_info); | |
325 | kfree(db_info->active_entries); | |
326 | kfree(db_info->active_pages); | |
1da177e4 LT |
327 | kfree(db_info); |
328 | } | |
329 | ||
330 | /* | |
331 | * debug_info_create | |
332 | * - create new debug-info | |
333 | */ | |
334 | ||
66a464db | 335 | static debug_info_t* |
5cbbf16a | 336 | debug_info_create(const char *name, int pages_per_area, int nr_areas, |
f4ae40a6 | 337 | int buf_size, umode_t mode) |
1da177e4 LT |
338 | { |
339 | debug_info_t* rc; | |
340 | ||
66a464db MH |
341 | rc = debug_info_alloc(name, pages_per_area, nr_areas, buf_size, |
342 | DEBUG_DEFAULT_LEVEL, ALL_AREAS); | |
1da177e4 LT |
343 | if(!rc) |
344 | goto out; | |
345 | ||
9637c3f3 MH |
346 | rc->mode = mode & ~S_IFMT; |
347 | ||
66a464db MH |
348 | /* create root directory */ |
349 | rc->debugfs_root_entry = debugfs_create_dir(rc->name, | |
350 | debug_debugfs_root_entry); | |
1da177e4 LT |
351 | |
352 | /* append new element to linked list */ | |
66a464db | 353 | if (!debug_area_first) { |
1da177e4 LT |
354 | /* first element in list */ |
355 | debug_area_first = rc; | |
356 | rc->prev = NULL; | |
357 | } else { | |
358 | /* append element to end of list */ | |
359 | debug_area_last->next = rc; | |
360 | rc->prev = debug_area_last; | |
361 | } | |
362 | debug_area_last = rc; | |
363 | rc->next = NULL; | |
364 | ||
efc0c21c | 365 | refcount_set(&rc->ref_count, 1); |
1da177e4 LT |
366 | out: |
367 | return rc; | |
368 | } | |
369 | ||
370 | /* | |
371 | * debug_info_copy | |
372 | * - copy debug-info | |
373 | */ | |
374 | ||
66a464db MH |
375 | static debug_info_t* |
376 | debug_info_copy(debug_info_t* in, int mode) | |
1da177e4 | 377 | { |
66a464db | 378 | int i,j; |
1da177e4 | 379 | debug_info_t* rc; |
942eaabd MH |
380 | unsigned long flags; |
381 | ||
382 | /* get a consistent copy of the debug areas */ | |
383 | do { | |
384 | rc = debug_info_alloc(in->name, in->pages_per_area, | |
385 | in->nr_areas, in->buf_size, in->level, mode); | |
386 | spin_lock_irqsave(&in->lock, flags); | |
387 | if(!rc) | |
388 | goto out; | |
389 | /* has something changed in the meantime ? */ | |
390 | if((rc->pages_per_area == in->pages_per_area) && | |
391 | (rc->nr_areas == in->nr_areas)) { | |
392 | break; | |
393 | } | |
394 | spin_unlock_irqrestore(&in->lock, flags); | |
395 | debug_info_free(rc); | |
396 | } while (1); | |
66a464db | 397 | |
acfa922c | 398 | if (mode == NO_AREAS) |
1da177e4 LT |
399 | goto out; |
400 | ||
401 | for(i = 0; i < in->nr_areas; i++){ | |
66a464db MH |
402 | for(j = 0; j < in->pages_per_area; j++) { |
403 | memcpy(rc->areas[i][j], in->areas[i][j],PAGE_SIZE); | |
404 | } | |
1da177e4 LT |
405 | } |
406 | out: | |
942eaabd | 407 | spin_unlock_irqrestore(&in->lock, flags); |
1da177e4 LT |
408 | return rc; |
409 | } | |
410 | ||
411 | /* | |
412 | * debug_info_get | |
413 | * - increments reference count for debug-info | |
414 | */ | |
415 | ||
66a464db MH |
416 | static void |
417 | debug_info_get(debug_info_t * db_info) | |
1da177e4 LT |
418 | { |
419 | if (db_info) | |
efc0c21c | 420 | refcount_inc(&db_info->ref_count); |
1da177e4 LT |
421 | } |
422 | ||
423 | /* | |
424 | * debug_info_put: | |
425 | * - decreases reference count for debug-info and frees it if necessary | |
426 | */ | |
427 | ||
66a464db MH |
428 | static void |
429 | debug_info_put(debug_info_t *db_info) | |
1da177e4 LT |
430 | { |
431 | int i; | |
432 | ||
433 | if (!db_info) | |
434 | return; | |
efc0c21c | 435 | if (refcount_dec_and_test(&db_info->ref_count)) { |
1da177e4 | 436 | for (i = 0; i < DEBUG_MAX_VIEWS; i++) { |
66a464db | 437 | if (!db_info->views[i]) |
1da177e4 | 438 | continue; |
66a464db | 439 | debugfs_remove(db_info->debugfs_entries[i]); |
1da177e4 | 440 | } |
66a464db | 441 | debugfs_remove(db_info->debugfs_root_entry); |
1da177e4 LT |
442 | if(db_info == debug_area_first) |
443 | debug_area_first = db_info->next; | |
444 | if(db_info == debug_area_last) | |
445 | debug_area_last = db_info->prev; | |
446 | if(db_info->prev) db_info->prev->next = db_info->next; | |
447 | if(db_info->next) db_info->next->prev = db_info->prev; | |
448 | debug_info_free(db_info); | |
449 | } | |
450 | } | |
451 | ||
452 | /* | |
453 | * debug_format_entry: | |
454 | * - format one debug entry and return size of formated data | |
455 | */ | |
456 | ||
66a464db MH |
457 | static int |
458 | debug_format_entry(file_private_info_t *p_info) | |
1da177e4 | 459 | { |
1da177e4 LT |
460 | debug_info_t *id_snap = p_info->debug_info_snap; |
461 | struct debug_view *view = p_info->view; | |
462 | debug_entry_t *act_entry; | |
463 | size_t len = 0; | |
464 | if(p_info->act_entry == DEBUG_PROLOG_ENTRY){ | |
465 | /* print prolog */ | |
466 | if (view->prolog_proc) | |
66a464db | 467 | len += view->prolog_proc(id_snap,view,p_info->temp_buf); |
1da177e4 LT |
468 | goto out; |
469 | } | |
66a464db MH |
470 | if (!id_snap->areas) /* this is true, if we have a prolog only view */ |
471 | goto out; /* or if 'pages_per_area' is 0 */ | |
472 | act_entry = (debug_entry_t *) ((char*)id_snap->areas[p_info->act_area] | |
473 | [p_info->act_page] + p_info->act_entry); | |
1da177e4 LT |
474 | |
475 | if (act_entry->id.stck == 0LL) | |
476 | goto out; /* empty entry */ | |
477 | if (view->header_proc) | |
66a464db | 478 | len += view->header_proc(id_snap, view, p_info->act_area, |
1da177e4 LT |
479 | act_entry, p_info->temp_buf + len); |
480 | if (view->format_proc) | |
66a464db | 481 | len += view->format_proc(id_snap, view, p_info->temp_buf + len, |
1da177e4 | 482 | DEBUG_DATA(act_entry)); |
66a464db | 483 | out: |
1da177e4 LT |
484 | return len; |
485 | } | |
486 | ||
487 | /* | |
488 | * debug_next_entry: | |
489 | * - goto next entry in p_info | |
490 | */ | |
491 | ||
4448aaf0 | 492 | static inline int |
66a464db | 493 | debug_next_entry(file_private_info_t *p_info) |
1da177e4 | 494 | { |
66a464db MH |
495 | debug_info_t *id; |
496 | ||
497 | id = p_info->debug_info_snap; | |
1da177e4 LT |
498 | if(p_info->act_entry == DEBUG_PROLOG_ENTRY){ |
499 | p_info->act_entry = 0; | |
66a464db | 500 | p_info->act_page = 0; |
1da177e4 LT |
501 | goto out; |
502 | } | |
66a464db MH |
503 | if(!id->areas) |
504 | return 1; | |
505 | p_info->act_entry += id->entry_size; | |
506 | /* switch to next page, if we reached the end of the page */ | |
507 | if (p_info->act_entry > (PAGE_SIZE - id->entry_size)){ | |
508 | /* next page */ | |
1da177e4 | 509 | p_info->act_entry = 0; |
66a464db MH |
510 | p_info->act_page += 1; |
511 | if((p_info->act_page % id->pages_per_area) == 0) { | |
512 | /* next area */ | |
513 | p_info->act_area++; | |
514 | p_info->act_page=0; | |
515 | } | |
1da177e4 LT |
516 | if(p_info->act_area >= id->nr_areas) |
517 | return 1; | |
518 | } | |
519 | out: | |
520 | return 0; | |
521 | } | |
522 | ||
523 | /* | |
524 | * debug_output: | |
525 | * - called for user read() | |
526 | * - copies formated debug entries to the user buffer | |
527 | */ | |
528 | ||
66a464db MH |
529 | static ssize_t |
530 | debug_output(struct file *file, /* file descriptor */ | |
531 | char __user *user_buf, /* user buffer */ | |
532 | size_t len, /* length of buffer */ | |
533 | loff_t *offset) /* offset in the file */ | |
1da177e4 LT |
534 | { |
535 | size_t count = 0; | |
66a464db | 536 | size_t entry_offset; |
1da177e4 LT |
537 | file_private_info_t *p_info; |
538 | ||
539 | p_info = ((file_private_info_t *) file->private_data); | |
540 | if (*offset != p_info->offset) | |
541 | return -EPIPE; | |
542 | if(p_info->act_area >= p_info->debug_info_snap->nr_areas) | |
543 | return 0; | |
1da177e4 | 544 | entry_offset = p_info->act_entry_offset; |
1da177e4 | 545 | while(count < len){ |
66a464db MH |
546 | int formatted_line_size; |
547 | int formatted_line_residue; | |
548 | int user_buf_residue; | |
549 | size_t copy_size; | |
550 | ||
551 | formatted_line_size = debug_format_entry(p_info); | |
552 | formatted_line_residue = formatted_line_size - entry_offset; | |
553 | user_buf_residue = len-count; | |
554 | copy_size = min(user_buf_residue, formatted_line_residue); | |
555 | if(copy_size){ | |
556 | if (copy_to_user(user_buf + count, p_info->temp_buf | |
557 | + entry_offset, copy_size)) | |
558 | return -EFAULT; | |
559 | count += copy_size; | |
560 | entry_offset += copy_size; | |
1da177e4 | 561 | } |
66a464db MH |
562 | if(copy_size == formatted_line_residue){ |
563 | entry_offset = 0; | |
564 | if(debug_next_entry(p_info)) | |
1da177e4 | 565 | goto out; |
66a464db | 566 | } |
1da177e4 LT |
567 | } |
568 | out: | |
569 | p_info->offset = *offset + count; | |
66a464db | 570 | p_info->act_entry_offset = entry_offset; |
1da177e4 LT |
571 | *offset = p_info->offset; |
572 | return count; | |
573 | } | |
574 | ||
575 | /* | |
576 | * debug_input: | |
577 | * - called for user write() | |
578 | * - calls input function of view | |
579 | */ | |
580 | ||
66a464db MH |
581 | static ssize_t |
582 | debug_input(struct file *file, const char __user *user_buf, size_t length, | |
583 | loff_t *offset) | |
1da177e4 LT |
584 | { |
585 | int rc = 0; | |
586 | file_private_info_t *p_info; | |
587 | ||
e11f0d04 | 588 | mutex_lock(&debug_mutex); |
1da177e4 LT |
589 | p_info = ((file_private_info_t *) file->private_data); |
590 | if (p_info->view->input_proc) | |
591 | rc = p_info->view->input_proc(p_info->debug_info_org, | |
592 | p_info->view, file, user_buf, | |
593 | length, offset); | |
594 | else | |
595 | rc = -EPERM; | |
e11f0d04 | 596 | mutex_unlock(&debug_mutex); |
1da177e4 LT |
597 | return rc; /* number of input characters */ |
598 | } | |
599 | ||
600 | /* | |
601 | * debug_open: | |
602 | * - called for user open() | |
603 | * - copies formated output to private_data area of the file | |
604 | * handle | |
605 | */ | |
606 | ||
66a464db MH |
607 | static int |
608 | debug_open(struct inode *inode, struct file *file) | |
1da177e4 | 609 | { |
a0fa8e37 | 610 | int i, rc = 0; |
1da177e4 LT |
611 | file_private_info_t *p_info; |
612 | debug_info_t *debug_info, *debug_info_snapshot; | |
613 | ||
e11f0d04 | 614 | mutex_lock(&debug_mutex); |
496ad9aa | 615 | debug_info = file_inode(file)->i_private; |
942eaabd MH |
616 | /* find debug view */ |
617 | for (i = 0; i < DEBUG_MAX_VIEWS; i++) { | |
618 | if (!debug_info->views[i]) | |
619 | continue; | |
620 | else if (debug_info->debugfs_entries[i] == | |
d20343e7 | 621 | file->f_path.dentry) { |
942eaabd | 622 | goto found; /* found view ! */ |
1da177e4 | 623 | } |
1da177e4 LT |
624 | } |
625 | /* no entry found */ | |
626 | rc = -EINVAL; | |
627 | goto out; | |
628 | ||
66a464db | 629 | found: |
1da177e4 | 630 | |
66a464db MH |
631 | /* Make snapshot of current debug areas to get it consistent. */ |
632 | /* To copy all the areas is only needed, if we have a view which */ | |
633 | /* formats the debug areas. */ | |
1da177e4 | 634 | |
66a464db MH |
635 | if(!debug_info->views[i]->format_proc && |
636 | !debug_info->views[i]->header_proc){ | |
637 | debug_info_snapshot = debug_info_copy(debug_info, NO_AREAS); | |
638 | } else { | |
639 | debug_info_snapshot = debug_info_copy(debug_info, ALL_AREAS); | |
640 | } | |
1da177e4 LT |
641 | |
642 | if(!debug_info_snapshot){ | |
1da177e4 LT |
643 | rc = -ENOMEM; |
644 | goto out; | |
645 | } | |
5cbded58 | 646 | p_info = kmalloc(sizeof(file_private_info_t), |
66a464db MH |
647 | GFP_KERNEL); |
648 | if(!p_info){ | |
58ace9f2 | 649 | debug_info_free(debug_info_snapshot); |
1da177e4 LT |
650 | rc = -ENOMEM; |
651 | goto out; | |
652 | } | |
1da177e4 LT |
653 | p_info->offset = 0; |
654 | p_info->debug_info_snap = debug_info_snapshot; | |
655 | p_info->debug_info_org = debug_info; | |
656 | p_info->view = debug_info->views[i]; | |
657 | p_info->act_area = 0; | |
66a464db | 658 | p_info->act_page = 0; |
1da177e4 LT |
659 | p_info->act_entry = DEBUG_PROLOG_ENTRY; |
660 | p_info->act_entry_offset = 0; | |
66a464db | 661 | file->private_data = p_info; |
1da177e4 | 662 | debug_info_get(debug_info); |
58ea91c0 | 663 | nonseekable_open(inode, file); |
66a464db | 664 | out: |
e11f0d04 | 665 | mutex_unlock(&debug_mutex); |
1da177e4 LT |
666 | return rc; |
667 | } | |
668 | ||
669 | /* | |
670 | * debug_close: | |
671 | * - called for user close() | |
672 | * - deletes private_data area of the file handle | |
673 | */ | |
674 | ||
66a464db MH |
675 | static int |
676 | debug_close(struct inode *inode, struct file *file) | |
1da177e4 LT |
677 | { |
678 | file_private_info_t *p_info; | |
1da177e4 | 679 | p_info = (file_private_info_t *) file->private_data; |
66a464db MH |
680 | if(p_info->debug_info_snap) |
681 | debug_info_free(p_info->debug_info_snap); | |
1da177e4 LT |
682 | debug_info_put(p_info->debug_info_org); |
683 | kfree(file->private_data); | |
684 | return 0; /* success */ | |
685 | } | |
686 | ||
687 | /* | |
9637c3f3 MH |
688 | * debug_register_mode: |
689 | * - Creates and initializes debug area for the caller | |
690 | * The mode parameter allows to specify access rights for the s390dbf files | |
691 | * - Returns handle for debug area | |
1da177e4 LT |
692 | */ |
693 | ||
5cbbf16a | 694 | debug_info_t *debug_register_mode(const char *name, int pages_per_area, |
f4ae40a6 | 695 | int nr_areas, int buf_size, umode_t mode, |
5cbbf16a | 696 | uid_t uid, gid_t gid) |
1da177e4 LT |
697 | { |
698 | debug_info_t *rc = NULL; | |
699 | ||
9637c3f3 MH |
700 | /* Since debugfs currently does not support uid/gid other than root, */ |
701 | /* we do not allow gid/uid != 0 until we get support for that. */ | |
702 | if ((uid != 0) || (gid != 0)) | |
baebc70a | 703 | pr_warn("Root becomes the owner of all s390dbf files 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 | { |
6e2ef5e4 MS |
870 | active->id.stck = get_tod_clock_fast() - |
871 | *(unsigned long long *) &tod_clock_base[1]; | |
1da177e4 LT |
872 | active->id.fields.cpuid = smp_processor_id(); |
873 | active->caller = __builtin_return_address(0); | |
874 | active->id.fields.exception = exception; | |
875 | active->id.fields.level = level; | |
876 | proceed_active_entry(id); | |
877 | if(exception) | |
878 | proceed_active_area(id); | |
879 | } | |
880 | ||
881 | static int debug_stoppable=1; | |
882 | static int debug_active=1; | |
883 | ||
1da177e4 LT |
884 | #define CTL_S390DBF_STOPPABLE 5678 |
885 | #define CTL_S390DBF_ACTIVE 5679 | |
886 | ||
887 | /* | |
888 | * proc handler for the running debug_active sysctl | |
889 | * always allow read, allow write only if debug_stoppable is set or | |
890 | * if debug_active is already off | |
891 | */ | |
66a464db | 892 | static int |
302bfe20 | 893 | s390dbf_procactive(struct ctl_table *table, int write, |
1da177e4 LT |
894 | void __user *buffer, size_t *lenp, loff_t *ppos) |
895 | { | |
896 | if (!write || debug_stoppable || !debug_active) | |
8d65af78 | 897 | return proc_dointvec(table, write, buffer, lenp, ppos); |
1da177e4 LT |
898 | else |
899 | return 0; | |
900 | } | |
901 | ||
902 | ||
903 | static struct ctl_table s390dbf_table[] = { | |
904 | { | |
1da177e4 LT |
905 | .procname = "debug_stoppable", |
906 | .data = &debug_stoppable, | |
907 | .maxlen = sizeof(int), | |
908 | .mode = S_IRUGO | S_IWUSR, | |
6d456111 | 909 | .proc_handler = proc_dointvec, |
1da177e4 LT |
910 | }, |
911 | { | |
1da177e4 LT |
912 | .procname = "debug_active", |
913 | .data = &debug_active, | |
914 | .maxlen = sizeof(int), | |
915 | .mode = S_IRUGO | S_IWUSR, | |
6d456111 | 916 | .proc_handler = s390dbf_procactive, |
1da177e4 | 917 | }, |
b05fd35d | 918 | { } |
1da177e4 LT |
919 | }; |
920 | ||
921 | static struct ctl_table s390dbf_dir_table[] = { | |
922 | { | |
1da177e4 LT |
923 | .procname = "s390dbf", |
924 | .maxlen = 0, | |
925 | .mode = S_IRUGO | S_IXUGO, | |
926 | .child = s390dbf_table, | |
927 | }, | |
b05fd35d | 928 | { } |
1da177e4 LT |
929 | }; |
930 | ||
2b67fc46 | 931 | static struct ctl_table_header *s390dbf_sysctl_header; |
1da177e4 | 932 | |
66a464db MH |
933 | void |
934 | debug_stop_all(void) | |
1da177e4 LT |
935 | { |
936 | if (debug_stoppable) | |
937 | debug_active = 0; | |
938 | } | |
d5274369 | 939 | EXPORT_SYMBOL(debug_stop_all); |
1da177e4 | 940 | |
3ab121ab MH |
941 | void debug_set_critical(void) |
942 | { | |
943 | debug_critical = 1; | |
944 | } | |
945 | ||
1da177e4 LT |
946 | /* |
947 | * debug_event_common: | |
948 | * - write debug entry with given size | |
949 | */ | |
950 | ||
66a464db MH |
951 | debug_entry_t* |
952 | debug_event_common(debug_info_t * id, int level, const void *buf, int len) | |
1da177e4 LT |
953 | { |
954 | unsigned long flags; | |
955 | debug_entry_t *active; | |
956 | ||
66a464db | 957 | if (!debug_active || !id->areas) |
1da177e4 | 958 | return NULL; |
3ab121ab MH |
959 | if (debug_critical) { |
960 | if (!spin_trylock_irqsave(&id->lock, flags)) | |
961 | return NULL; | |
962 | } else | |
963 | spin_lock_irqsave(&id->lock, flags); | |
1da177e4 LT |
964 | active = get_active_entry(id); |
965 | memset(DEBUG_DATA(active), 0, id->buf_size); | |
966 | memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size)); | |
967 | debug_finish_entry(id, active, level, 0); | |
968 | spin_unlock_irqrestore(&id->lock, flags); | |
969 | ||
970 | return active; | |
971 | } | |
d5274369 | 972 | EXPORT_SYMBOL(debug_event_common); |
1da177e4 LT |
973 | |
974 | /* | |
975 | * debug_exception_common: | |
976 | * - write debug entry with given size and switch to next debug area | |
977 | */ | |
978 | ||
66a464db MH |
979 | debug_entry_t |
980 | *debug_exception_common(debug_info_t * id, int level, const void *buf, int len) | |
1da177e4 LT |
981 | { |
982 | unsigned long flags; | |
983 | debug_entry_t *active; | |
984 | ||
66a464db | 985 | if (!debug_active || !id->areas) |
1da177e4 | 986 | return NULL; |
3ab121ab MH |
987 | if (debug_critical) { |
988 | if (!spin_trylock_irqsave(&id->lock, flags)) | |
989 | return NULL; | |
990 | } else | |
991 | spin_lock_irqsave(&id->lock, flags); | |
1da177e4 LT |
992 | active = get_active_entry(id); |
993 | memset(DEBUG_DATA(active), 0, id->buf_size); | |
994 | memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size)); | |
995 | debug_finish_entry(id, active, level, 1); | |
996 | spin_unlock_irqrestore(&id->lock, flags); | |
997 | ||
998 | return active; | |
999 | } | |
d5274369 | 1000 | EXPORT_SYMBOL(debug_exception_common); |
1da177e4 LT |
1001 | |
1002 | /* | |
1003 | * counts arguments in format string for sprintf view | |
1004 | */ | |
1005 | ||
4448aaf0 | 1006 | static inline int |
66a464db | 1007 | debug_count_numargs(char *string) |
1da177e4 LT |
1008 | { |
1009 | int numargs=0; | |
1010 | ||
1011 | while(*string) { | |
1012 | if(*string++=='%') | |
1013 | numargs++; | |
1014 | } | |
1015 | return(numargs); | |
1016 | } | |
1017 | ||
1018 | /* | |
1019 | * debug_sprintf_event: | |
1020 | */ | |
1021 | ||
66a464db | 1022 | debug_entry_t* |
832a7710 | 1023 | __debug_sprintf_event(debug_info_t *id, int level, char *string, ...) |
1da177e4 LT |
1024 | { |
1025 | va_list ap; | |
1026 | int numargs,idx; | |
1027 | unsigned long flags; | |
1028 | debug_sprintf_entry_t *curr_event; | |
1029 | debug_entry_t *active; | |
1030 | ||
66a464db | 1031 | if (!debug_active || !id->areas) |
1da177e4 LT |
1032 | return NULL; |
1033 | numargs=debug_count_numargs(string); | |
1034 | ||
3ab121ab MH |
1035 | if (debug_critical) { |
1036 | if (!spin_trylock_irqsave(&id->lock, flags)) | |
1037 | return NULL; | |
1038 | } else | |
1039 | spin_lock_irqsave(&id->lock, flags); | |
1da177e4 LT |
1040 | active = get_active_entry(id); |
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); | |
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 | */ | |
1057 | ||
66a464db | 1058 | debug_entry_t* |
832a7710 | 1059 | __debug_sprintf_exception(debug_info_t *id, int level, char *string, ...) |
1da177e4 LT |
1060 | { |
1061 | va_list ap; | |
1062 | int numargs,idx; | |
1063 | unsigned long flags; | |
1064 | debug_sprintf_entry_t *curr_event; | |
1065 | debug_entry_t *active; | |
1066 | ||
66a464db | 1067 | if (!debug_active || !id->areas) |
1da177e4 LT |
1068 | return NULL; |
1069 | ||
1070 | numargs=debug_count_numargs(string); | |
1071 | ||
3ab121ab MH |
1072 | if (debug_critical) { |
1073 | if (!spin_trylock_irqsave(&id->lock, flags)) | |
1074 | return NULL; | |
1075 | } else | |
1076 | spin_lock_irqsave(&id->lock, flags); | |
1da177e4 LT |
1077 | active = get_active_entry(id); |
1078 | curr_event=(debug_sprintf_entry_t *)DEBUG_DATA(active); | |
1079 | va_start(ap,string); | |
1080 | curr_event->string=string; | |
1081 | for(idx=0;idx<min(numargs,(int)(id->buf_size / sizeof(long))-1);idx++) | |
1082 | curr_event->args[idx]=va_arg(ap,long); | |
1083 | va_end(ap); | |
1084 | debug_finish_entry(id, active, level, 1); | |
1085 | spin_unlock_irqrestore(&id->lock, flags); | |
1086 | ||
1087 | return active; | |
1088 | } | |
832a7710 | 1089 | EXPORT_SYMBOL(__debug_sprintf_exception); |
1da177e4 LT |
1090 | |
1091 | /* | |
1092 | * debug_register_view: | |
1093 | */ | |
1094 | ||
66a464db MH |
1095 | int |
1096 | debug_register_view(debug_info_t * id, struct debug_view *view) | |
1da177e4 LT |
1097 | { |
1098 | int rc = 0; | |
1099 | int i; | |
1100 | unsigned long flags; | |
f4ae40a6 | 1101 | umode_t mode; |
66a464db | 1102 | struct dentry *pde; |
1da177e4 LT |
1103 | |
1104 | if (!id) | |
1105 | goto out; | |
9637c3f3 MH |
1106 | mode = (id->mode | S_IFREG) & ~S_IXUGO; |
1107 | if (!(view->prolog_proc || view->format_proc || view->header_proc)) | |
1108 | mode &= ~(S_IRUSR | S_IRGRP | S_IROTH); | |
1109 | if (!view->input_proc) | |
1110 | mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH); | |
66a464db | 1111 | pde = debugfs_create_file(view->name, mode, id->debugfs_root_entry, |
942eaabd | 1112 | id , &debug_file_ops); |
1da177e4 | 1113 | if (!pde){ |
c5612c19 MH |
1114 | pr_err("Registering view %s/%s failed due to out of " |
1115 | "memory\n", id->name,view->name); | |
1da177e4 LT |
1116 | rc = -1; |
1117 | goto out; | |
1118 | } | |
1da177e4 LT |
1119 | spin_lock_irqsave(&id->lock, flags); |
1120 | for (i = 0; i < DEBUG_MAX_VIEWS; i++) { | |
66a464db | 1121 | if (!id->views[i]) |
1da177e4 LT |
1122 | break; |
1123 | } | |
1124 | if (i == DEBUG_MAX_VIEWS) { | |
c5612c19 MH |
1125 | pr_err("Registering view %s/%s would exceed the maximum " |
1126 | "number of views %i\n", id->name, view->name, i); | |
1da177e4 | 1127 | rc = -1; |
66a464db | 1128 | } else { |
1da177e4 | 1129 | id->views[i] = view; |
66a464db | 1130 | id->debugfs_entries[i] = pde; |
1da177e4 LT |
1131 | } |
1132 | spin_unlock_irqrestore(&id->lock, flags); | |
5a334c08 MH |
1133 | if (rc) |
1134 | debugfs_remove(pde); | |
66a464db | 1135 | out: |
1da177e4 LT |
1136 | return rc; |
1137 | } | |
d5274369 | 1138 | EXPORT_SYMBOL(debug_register_view); |
1da177e4 LT |
1139 | |
1140 | /* | |
1141 | * debug_unregister_view: | |
1142 | */ | |
1143 | ||
66a464db MH |
1144 | int |
1145 | debug_unregister_view(debug_info_t * id, struct debug_view *view) | |
1da177e4 | 1146 | { |
5a334c08 | 1147 | struct dentry *dentry = NULL; |
1da177e4 | 1148 | unsigned long flags; |
5a334c08 | 1149 | int i, rc = 0; |
1da177e4 LT |
1150 | |
1151 | if (!id) | |
1152 | goto out; | |
1153 | spin_lock_irqsave(&id->lock, flags); | |
1154 | for (i = 0; i < DEBUG_MAX_VIEWS; i++) { | |
1155 | if (id->views[i] == view) | |
1156 | break; | |
1157 | } | |
1158 | if (i == DEBUG_MAX_VIEWS) | |
1159 | rc = -1; | |
1160 | else { | |
5a334c08 | 1161 | dentry = id->debugfs_entries[i]; |
1da177e4 | 1162 | id->views[i] = NULL; |
5a334c08 | 1163 | id->debugfs_entries[i] = NULL; |
1da177e4 LT |
1164 | } |
1165 | spin_unlock_irqrestore(&id->lock, flags); | |
5a334c08 | 1166 | debugfs_remove(dentry); |
66a464db MH |
1167 | out: |
1168 | return rc; | |
1169 | } | |
d5274369 | 1170 | EXPORT_SYMBOL(debug_unregister_view); |
66a464db MH |
1171 | |
1172 | static inline char * | |
1173 | debug_get_user_string(const char __user *user_buf, size_t user_len) | |
1174 | { | |
1175 | char* buffer; | |
1176 | ||
1177 | buffer = kmalloc(user_len + 1, GFP_KERNEL); | |
1178 | if (!buffer) | |
1179 | return ERR_PTR(-ENOMEM); | |
1180 | if (copy_from_user(buffer, user_buf, user_len) != 0) { | |
1181 | kfree(buffer); | |
1182 | return ERR_PTR(-EFAULT); | |
1183 | } | |
1184 | /* got the string, now strip linefeed. */ | |
1185 | if (buffer[user_len - 1] == '\n') | |
1186 | buffer[user_len - 1] = 0; | |
1187 | else | |
1188 | buffer[user_len] = 0; | |
1189 | return buffer; | |
1190 | } | |
1191 | ||
1192 | static inline int | |
1193 | debug_get_uint(char *buf) | |
1194 | { | |
1195 | int rc; | |
1196 | ||
e7d2860b | 1197 | buf = skip_spaces(buf); |
66a464db MH |
1198 | rc = simple_strtoul(buf, &buf, 10); |
1199 | if(*buf){ | |
66a464db MH |
1200 | rc = -EINVAL; |
1201 | } | |
1da177e4 LT |
1202 | return rc; |
1203 | } | |
1204 | ||
1205 | /* | |
1206 | * functions for debug-views | |
1207 | *********************************** | |
1208 | */ | |
1209 | ||
1210 | /* | |
1211 | * prints out actual debug level | |
1212 | */ | |
1213 | ||
66a464db MH |
1214 | static int |
1215 | debug_prolog_pages_fn(debug_info_t * id, | |
1da177e4 | 1216 | struct debug_view *view, char *out_buf) |
66a464db MH |
1217 | { |
1218 | return sprintf(out_buf, "%i\n", id->pages_per_area); | |
1219 | } | |
1220 | ||
1221 | /* | |
1222 | * reads new size (number of pages per debug area) | |
1223 | */ | |
1224 | ||
1225 | static int | |
1226 | debug_input_pages_fn(debug_info_t * id, struct debug_view *view, | |
1227 | struct file *file, const char __user *user_buf, | |
1228 | size_t user_len, loff_t * offset) | |
1229 | { | |
1230 | char *str; | |
1231 | int rc,new_pages; | |
1232 | ||
1233 | if (user_len > 0x10000) | |
1234 | user_len = 0x10000; | |
1235 | if (*offset != 0){ | |
1236 | rc = -EPIPE; | |
1237 | goto out; | |
1238 | } | |
1239 | str = debug_get_user_string(user_buf,user_len); | |
1240 | if(IS_ERR(str)){ | |
1241 | rc = PTR_ERR(str); | |
1242 | goto out; | |
1243 | } | |
1244 | new_pages = debug_get_uint(str); | |
1245 | if(new_pages < 0){ | |
1246 | rc = -EINVAL; | |
1247 | goto free_str; | |
1248 | } | |
1249 | rc = debug_set_size(id,id->nr_areas, new_pages); | |
1250 | if(rc != 0){ | |
1251 | rc = -EINVAL; | |
1252 | goto free_str; | |
1253 | } | |
1254 | rc = user_len; | |
1255 | free_str: | |
1256 | kfree(str); | |
1257 | out: | |
1258 | *offset += user_len; | |
1259 | return rc; /* number of input characters */ | |
1260 | } | |
1261 | ||
1262 | /* | |
1263 | * prints out actual debug level | |
1264 | */ | |
1265 | ||
1266 | static int | |
1267 | debug_prolog_level_fn(debug_info_t * id, struct debug_view *view, char *out_buf) | |
1da177e4 LT |
1268 | { |
1269 | int rc = 0; | |
1270 | ||
66a464db MH |
1271 | if(id->level == DEBUG_OFF_LEVEL) { |
1272 | rc = sprintf(out_buf,"-\n"); | |
1273 | } | |
1274 | else { | |
1275 | rc = sprintf(out_buf, "%i\n", id->level); | |
1276 | } | |
1da177e4 LT |
1277 | return rc; |
1278 | } | |
1279 | ||
1280 | /* | |
1281 | * reads new debug level | |
1282 | */ | |
1283 | ||
66a464db MH |
1284 | static int |
1285 | debug_input_level_fn(debug_info_t * id, struct debug_view *view, | |
1286 | struct file *file, const char __user *user_buf, | |
1287 | size_t user_len, loff_t * offset) | |
1da177e4 | 1288 | { |
66a464db MH |
1289 | char *str; |
1290 | int rc,new_level; | |
1da177e4 | 1291 | |
66a464db MH |
1292 | if (user_len > 0x10000) |
1293 | user_len = 0x10000; | |
1294 | if (*offset != 0){ | |
1295 | rc = -EPIPE; | |
1da177e4 | 1296 | goto out; |
66a464db MH |
1297 | } |
1298 | str = debug_get_user_string(user_buf,user_len); | |
1299 | if(IS_ERR(str)){ | |
1300 | rc = PTR_ERR(str); | |
1da177e4 LT |
1301 | goto out; |
1302 | } | |
66a464db | 1303 | if(str[0] == '-'){ |
1da177e4 | 1304 | debug_set_level(id, DEBUG_OFF_LEVEL); |
66a464db MH |
1305 | rc = user_len; |
1306 | goto free_str; | |
1da177e4 | 1307 | } else { |
66a464db | 1308 | new_level = debug_get_uint(str); |
1da177e4 | 1309 | } |
66a464db | 1310 | if(new_level < 0) { |
baebc70a | 1311 | pr_warn("%s is not a valid level for a debug 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 | { | |
6e2ef5e4 | 1460 | unsigned long base, sec, usec; |
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; | |
6e2ef5e4 MS |
1467 | base = (*(unsigned long *) &tod_clock_base[0]) >> 4; |
1468 | sec = (entry->id.stck >> 12) + base - (TOD_UNIX_EPOCH >> 12); | |
ea417aa8 | 1469 | usec = do_div(sec, USEC_PER_SEC); |
1da177e4 LT |
1470 | |
1471 | if (entry->id.fields.exception) | |
1472 | except_str = "*"; | |
1473 | else | |
1474 | except_str = "-"; | |
9cb1ccec | 1475 | caller = (unsigned long) entry->caller; |
ea417aa8 MS |
1476 | rc += sprintf(out_buf, "%02i %011ld:%06lu %1u %1s %02i %p ", |
1477 | area, sec, usec, level, except_str, | |
689911c7 | 1478 | entry->id.fields.cpuid, (void *)caller); |
1da177e4 LT |
1479 | return rc; |
1480 | } | |
d5274369 | 1481 | EXPORT_SYMBOL(debug_dflt_header_fn); |
1da177e4 LT |
1482 | |
1483 | /* | |
1484 | * prints debug data sprintf-formated: | |
1485 | * debug_sprinf_event/exception calls must be used together with this view | |
1486 | */ | |
1487 | ||
1488 | #define DEBUG_SPRINTF_MAX_ARGS 10 | |
1489 | ||
66a464db MH |
1490 | static int |
1491 | debug_sprintf_format_fn(debug_info_t * id, struct debug_view *view, | |
1492 | char *out_buf, debug_sprintf_entry_t *curr_event) | |
1da177e4 LT |
1493 | { |
1494 | int num_longs, num_used_args = 0,i, rc = 0; | |
1495 | int index[DEBUG_SPRINTF_MAX_ARGS]; | |
1496 | ||
1497 | /* count of longs fit into one entry */ | |
1498 | num_longs = id->buf_size / sizeof(long); | |
1499 | ||
1500 | if(num_longs < 1) | |
1501 | goto out; /* bufsize of entry too small */ | |
1502 | if(num_longs == 1) { | |
1503 | /* no args, we use only the string */ | |
1504 | strcpy(out_buf, curr_event->string); | |
1505 | rc = strlen(curr_event->string); | |
1506 | goto out; | |
1507 | } | |
1508 | ||
1509 | /* number of arguments used for sprintf (without the format string) */ | |
1510 | num_used_args = min(DEBUG_SPRINTF_MAX_ARGS, (num_longs - 1)); | |
1511 | ||
1512 | memset(index,0, DEBUG_SPRINTF_MAX_ARGS * sizeof(int)); | |
1513 | ||
1514 | for(i = 0; i < num_used_args; i++) | |
1515 | index[i] = i; | |
1516 | ||
1517 | rc = sprintf(out_buf, curr_event->string, curr_event->args[index[0]], | |
1518 | curr_event->args[index[1]], curr_event->args[index[2]], | |
1519 | curr_event->args[index[3]], curr_event->args[index[4]], | |
1520 | curr_event->args[index[5]], curr_event->args[index[6]], | |
1521 | curr_event->args[index[7]], curr_event->args[index[8]], | |
1522 | curr_event->args[index[9]]); | |
1523 | ||
1524 | out: | |
1525 | ||
1526 | return rc; | |
1527 | } | |
1528 | ||
1529 | /* | |
d5274369 HC |
1530 | * debug_init: |
1531 | * - is called exactly once to initialize the debug feature | |
1da177e4 | 1532 | */ |
d5274369 | 1533 | static int __init debug_init(void) |
1da177e4 | 1534 | { |
d5274369 HC |
1535 | s390dbf_sysctl_header = register_sysctl_table(s390dbf_dir_table); |
1536 | mutex_lock(&debug_mutex); | |
1537 | debug_debugfs_root_entry = debugfs_create_dir(DEBUG_DIR_ROOT, NULL); | |
1538 | initialized = 1; | |
1539 | mutex_unlock(&debug_mutex); | |
1540 | return 0; | |
1da177e4 | 1541 | } |
66a464db | 1542 | postcore_initcall(debug_init); |