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1 | /*****************************************************************************\ |
2 | * Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC. | |
3 | * Copyright (C) 2007 The Regents of the University of California. | |
4 | * Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER). | |
5 | * Written by Brian Behlendorf <behlendorf1@llnl.gov>. | |
715f6251 | 6 | * UCRL-CODE-235197 |
57d1b188 | 7 | * |
716154c5 BB |
8 | * This file is part of the SPL, Solaris Porting Layer. |
9 | * For details, see <http://github.com/behlendorf/spl/>. | |
10 | * | |
11 | * The SPL is free software; you can redistribute it and/or modify it | |
12 | * under the terms of the GNU General Public License as published by the | |
13 | * Free Software Foundation; either version 2 of the License, or (at your | |
14 | * option) any later version. | |
57d1b188 | 15 | * |
716154c5 | 16 | * The SPL is distributed in the hope that it will be useful, but WITHOUT |
715f6251 | 17 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
18 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
19 | * for more details. | |
57d1b188 | 20 | * |
715f6251 | 21 | * You should have received a copy of the GNU General Public License along |
716154c5 BB |
22 | * with the SPL. If not, see <http://www.gnu.org/licenses/>. |
23 | ***************************************************************************** | |
24 | * Solaris Porting Layer (SPL) Debug Implementation. | |
25 | \*****************************************************************************/ | |
57d1b188 | 26 | |
27 | #include <linux/kmod.h> | |
28 | #include <linux/mm.h> | |
29 | #include <linux/vmalloc.h> | |
30 | #include <linux/pagemap.h> | |
31 | #include <linux/slab.h> | |
32 | #include <linux/ctype.h> | |
33 | #include <linux/kthread.h> | |
34 | #include <linux/hardirq.h> | |
35 | #include <linux/interrupt.h> | |
f6c81c5e | 36 | #include <linux/spinlock.h> |
57d1b188 | 37 | #include <sys/sysmacros.h> |
38 | #include <sys/proc.h> | |
39 | #include <sys/debug.h> | |
40 | #include <spl-ctl.h> | |
57d1b188 | 41 | |
42 | #ifdef DEBUG_SUBSYSTEM | |
43 | #undef DEBUG_SUBSYSTEM | |
44 | #endif | |
45 | ||
46 | #define DEBUG_SUBSYSTEM S_DEBUG | |
47 | ||
48 | unsigned long spl_debug_subsys = ~0; | |
49 | EXPORT_SYMBOL(spl_debug_subsys); | |
50 | module_param(spl_debug_subsys, long, 0644); | |
51 | MODULE_PARM_DESC(spl_debug_subsys, "Subsystem debugging level mask."); | |
52 | ||
53 | unsigned long spl_debug_mask = (D_EMERG | D_ERROR | D_WARNING | D_CONSOLE); | |
54 | EXPORT_SYMBOL(spl_debug_mask); | |
55 | module_param(spl_debug_mask, long, 0644); | |
56 | MODULE_PARM_DESC(spl_debug_mask, "Debugging level mask."); | |
57 | ||
58 | unsigned long spl_debug_printk = D_CANTMASK; | |
59 | EXPORT_SYMBOL(spl_debug_printk); | |
60 | module_param(spl_debug_printk, long, 0644); | |
61 | MODULE_PARM_DESC(spl_debug_printk, "Console printk level mask."); | |
62 | ||
63 | int spl_debug_mb = -1; | |
64 | EXPORT_SYMBOL(spl_debug_mb); | |
65 | module_param(spl_debug_mb, int, 0644); | |
66 | MODULE_PARM_DESC(spl_debug_mb, "Total debug buffer size."); | |
67 | ||
68 | unsigned int spl_debug_binary = 1; | |
69 | EXPORT_SYMBOL(spl_debug_binary); | |
70 | ||
71 | unsigned int spl_debug_catastrophe; | |
72 | EXPORT_SYMBOL(spl_debug_catastrophe); | |
73 | ||
74 | unsigned int spl_debug_panic_on_bug = 1; | |
75 | EXPORT_SYMBOL(spl_debug_panic_on_bug); | |
76 | module_param(spl_debug_panic_on_bug, int, 0644); | |
77 | MODULE_PARM_DESC(spl_debug_panic_on_bug, "Panic on BUG"); | |
78 | ||
79 | static char spl_debug_file_name[PATH_MAX]; | |
80 | char spl_debug_file_path[PATH_MAX] = "/var/dumps/spl-log"; | |
81 | ||
82 | unsigned int spl_console_ratelimit = 1; | |
83 | EXPORT_SYMBOL(spl_console_ratelimit); | |
84 | ||
85 | long spl_console_max_delay; | |
86 | EXPORT_SYMBOL(spl_console_max_delay); | |
87 | ||
88 | long spl_console_min_delay; | |
89 | EXPORT_SYMBOL(spl_console_min_delay); | |
90 | ||
91 | unsigned int spl_console_backoff = SPL_DEFAULT_BACKOFF; | |
92 | EXPORT_SYMBOL(spl_console_backoff); | |
93 | ||
94 | unsigned int spl_debug_stack; | |
95 | EXPORT_SYMBOL(spl_debug_stack); | |
96 | ||
97 | static int spl_panic_in_progress; | |
98 | ||
99 | union trace_data_union (*trace_data[TCD_TYPE_MAX])[NR_CPUS] __cacheline_aligned; | |
100 | char *trace_console_buffers[NR_CPUS][3]; | |
101 | struct rw_semaphore trace_sem; | |
102 | atomic_t trace_tage_allocated = ATOMIC_INIT(0); | |
103 | ||
7fea96c0 | 104 | static int spl_debug_dump_all_pages(dumplog_priv_t *dp, char *); |
57d1b188 | 105 | static void trace_fini(void); |
106 | ||
107 | ||
108 | /* Memory percentage breakdown by type */ | |
109 | static unsigned int pages_factor[TCD_TYPE_MAX] = { | |
110 | 80, /* 80% pages for TCD_TYPE_PROC */ | |
111 | 10, /* 10% pages for TCD_TYPE_SOFTIRQ */ | |
112 | 10 /* 10% pages for TCD_TYPE_IRQ */ | |
113 | }; | |
114 | ||
57d1b188 | 115 | const char * |
116 | spl_debug_subsys2str(int subsys) | |
117 | { | |
118 | switch (subsys) { | |
119 | default: | |
120 | return NULL; | |
121 | case S_UNDEFINED: | |
122 | return "undefined"; | |
123 | case S_ATOMIC: | |
124 | return "atomic"; | |
125 | case S_KOBJ: | |
126 | return "kobj"; | |
127 | case S_VNODE: | |
128 | return "vnode"; | |
129 | case S_TIME: | |
130 | return "time"; | |
131 | case S_RWLOCK: | |
132 | return "rwlock"; | |
133 | case S_THREAD: | |
134 | return "thread"; | |
135 | case S_CONDVAR: | |
136 | return "condvar"; | |
137 | case S_MUTEX: | |
138 | return "mutex"; | |
139 | case S_RNG: | |
140 | return "rng"; | |
141 | case S_TASKQ: | |
142 | return "taskq"; | |
143 | case S_KMEM: | |
144 | return "kmem"; | |
e5bbd245 | 145 | case S_DEBUG: |
146 | return "debug"; | |
147 | case S_GENERIC: | |
148 | return "generic"; | |
149 | case S_PROC: | |
150 | return "proc"; | |
151 | case S_MODULE: | |
152 | return "module"; | |
ec7d53e9 BB |
153 | case S_CRED: |
154 | return "cred"; | |
57d1b188 | 155 | } |
156 | } | |
157 | ||
158 | const char * | |
159 | spl_debug_dbg2str(int debug) | |
160 | { | |
161 | switch (debug) { | |
162 | default: | |
163 | return NULL; | |
164 | case D_TRACE: | |
165 | return "trace"; | |
166 | case D_INFO: | |
167 | return "info"; | |
168 | case D_WARNING: | |
169 | return "warning"; | |
170 | case D_ERROR: | |
171 | return "error"; | |
172 | case D_EMERG: | |
173 | return "emerg"; | |
174 | case D_CONSOLE: | |
175 | return "console"; | |
176 | case D_IOCTL: | |
177 | return "ioctl"; | |
178 | case D_DPRINTF: | |
179 | return "dprintf"; | |
180 | case D_OTHER: | |
181 | return "other"; | |
182 | } | |
183 | } | |
184 | ||
185 | int | |
186 | spl_debug_mask2str(char *str, int size, unsigned long mask, int is_subsys) | |
187 | { | |
188 | const char *(*fn)(int bit) = is_subsys ? spl_debug_subsys2str : | |
189 | spl_debug_dbg2str; | |
190 | const char *token; | |
191 | int i, bit, len = 0; | |
192 | ||
193 | if (mask == 0) { /* "0" */ | |
194 | if (size > 0) | |
195 | str[0] = '0'; | |
196 | len = 1; | |
197 | } else { /* space-separated tokens */ | |
198 | for (i = 0; i < 32; i++) { | |
199 | bit = 1 << i; | |
200 | ||
201 | if ((mask & bit) == 0) | |
202 | continue; | |
203 | ||
204 | token = fn(bit); | |
205 | if (token == NULL) /* unused bit */ | |
206 | continue; | |
207 | ||
208 | if (len > 0) { /* separator? */ | |
209 | if (len < size) | |
210 | str[len] = ' '; | |
211 | len++; | |
212 | } | |
213 | ||
214 | while (*token != 0) { | |
215 | if (len < size) | |
216 | str[len] = *token; | |
217 | token++; | |
218 | len++; | |
219 | } | |
220 | } | |
221 | } | |
222 | ||
223 | /* terminate 'str' */ | |
224 | if (len < size) | |
225 | str[len] = 0; | |
226 | else | |
227 | str[size - 1] = 0; | |
228 | ||
229 | return len; | |
230 | } | |
231 | ||
232 | static int | |
233 | spl_debug_token2mask(int *mask, const char *str, int len, int is_subsys) | |
234 | { | |
235 | const char *(*fn)(int bit) = is_subsys ? spl_debug_subsys2str : | |
236 | spl_debug_dbg2str; | |
237 | const char *token; | |
238 | int i, j, bit; | |
239 | ||
240 | /* match against known tokens */ | |
241 | for (i = 0; i < 32; i++) { | |
242 | bit = 1 << i; | |
243 | ||
244 | token = fn(bit); | |
245 | if (token == NULL) /* unused? */ | |
246 | continue; | |
247 | ||
248 | /* strcasecmp */ | |
249 | for (j = 0; ; j++) { | |
250 | if (j == len) { /* end of token */ | |
251 | if (token[j] == 0) { | |
252 | *mask = bit; | |
253 | return 0; | |
254 | } | |
255 | break; | |
256 | } | |
257 | ||
258 | if (token[j] == 0) | |
259 | break; | |
260 | ||
261 | if (str[j] == token[j]) | |
262 | continue; | |
263 | ||
264 | if (str[j] < 'A' || 'Z' < str[j]) | |
265 | break; | |
266 | ||
267 | if (str[j] - 'A' + 'a' != token[j]) | |
268 | break; | |
269 | } | |
270 | } | |
271 | ||
272 | return -EINVAL; /* no match */ | |
273 | } | |
274 | ||
275 | int | |
276 | spl_debug_str2mask(unsigned long *mask, const char *str, int is_subsys) | |
277 | { | |
278 | char op = 0; | |
279 | int m = 0, matched, n, t; | |
280 | ||
281 | /* Allow a number for backwards compatibility */ | |
282 | for (n = strlen(str); n > 0; n--) | |
283 | if (!isspace(str[n-1])) | |
284 | break; | |
285 | matched = n; | |
286 | ||
287 | if ((t = sscanf(str, "%i%n", &m, &matched)) >= 1 && matched == n) { | |
288 | *mask = m; | |
289 | return 0; | |
290 | } | |
291 | ||
292 | /* <str> must be a list of debug tokens or numbers separated by | |
293 | * whitespace and optionally an operator ('+' or '-'). If an operator | |
294 | * appears first in <str>, '*mask' is used as the starting point | |
295 | * (relative), otherwise 0 is used (absolute). An operator applies to | |
296 | * all following tokens up to the next operator. */ | |
297 | matched = 0; | |
298 | while (*str != 0) { | |
299 | while (isspace(*str)) /* skip whitespace */ | |
300 | str++; | |
301 | ||
302 | if (*str == 0) | |
303 | break; | |
304 | ||
305 | if (*str == '+' || *str == '-') { | |
306 | op = *str++; | |
307 | ||
308 | /* op on first token == relative */ | |
309 | if (!matched) | |
310 | m = *mask; | |
311 | ||
312 | while (isspace(*str)) /* skip whitespace */ | |
313 | str++; | |
314 | ||
315 | if (*str == 0) /* trailing op */ | |
316 | return -EINVAL; | |
317 | } | |
318 | ||
319 | /* find token length */ | |
320 | for (n = 0; str[n] != 0 && !isspace(str[n]); n++); | |
321 | ||
322 | /* match token */ | |
323 | if (spl_debug_token2mask(&t, str, n, is_subsys) != 0) | |
324 | return -EINVAL; | |
325 | ||
326 | matched = 1; | |
327 | if (op == '-') | |
328 | m &= ~t; | |
329 | else | |
330 | m |= t; | |
331 | ||
332 | str += n; | |
333 | } | |
334 | ||
335 | if (!matched) | |
336 | return -EINVAL; | |
337 | ||
338 | *mask = m; | |
339 | return 0; | |
340 | } | |
341 | ||
57d1b188 | 342 | static void |
343 | spl_debug_dumplog_internal(dumplog_priv_t *dp) | |
344 | { | |
345 | void *journal_info; | |
346 | ||
347 | journal_info = current->journal_info; | |
348 | current->journal_info = NULL; | |
349 | ||
350 | snprintf(spl_debug_file_name, sizeof(spl_debug_file_path) - 1, | |
351 | "%s.%ld.%ld", spl_debug_file_path, | |
352 | get_seconds(), (long)dp->dp_pid); | |
353 | printk(KERN_ALERT "SPL: dumping log to %s\n", spl_debug_file_name); | |
7fea96c0 | 354 | spl_debug_dump_all_pages(dp, spl_debug_file_name); |
57d1b188 | 355 | |
356 | current->journal_info = journal_info; | |
357 | } | |
358 | ||
359 | static int | |
360 | spl_debug_dumplog_thread(void *arg) | |
361 | { | |
362 | dumplog_priv_t *dp = (dumplog_priv_t *)arg; | |
363 | ||
364 | spl_debug_dumplog_internal(dp); | |
7fea96c0 | 365 | atomic_set(&dp->dp_done, 1); |
57d1b188 | 366 | wake_up(&dp->dp_waitq); |
3d061e9d | 367 | complete_and_exit(NULL, 0); |
57d1b188 | 368 | |
369 | return 0; /* Unreachable */ | |
370 | } | |
371 | ||
7fea96c0 | 372 | /* When flag is set do not use a new thread for the debug dump */ |
57d1b188 | 373 | int |
7fea96c0 | 374 | spl_debug_dumplog(int flags) |
57d1b188 | 375 | { |
376 | struct task_struct *tsk; | |
377 | dumplog_priv_t dp; | |
57d1b188 | 378 | |
7fea96c0 | 379 | init_waitqueue_head(&dp.dp_waitq); |
380 | dp.dp_pid = current->pid; | |
381 | dp.dp_flags = flags; | |
382 | atomic_set(&dp.dp_done, 0); | |
57d1b188 | 383 | |
7fea96c0 | 384 | if (dp.dp_flags & DL_NOTHREAD) { |
385 | spl_debug_dumplog_internal(&dp); | |
386 | } else { | |
57d1b188 | 387 | |
7fea96c0 | 388 | tsk = kthread_create(spl_debug_dumplog_thread,(void *)&dp,"spl_debug"); |
389 | if (tsk == NULL) | |
390 | return -ENOMEM; | |
391 | ||
392 | wake_up_process(tsk); | |
393 | wait_event(dp.dp_waitq, atomic_read(&dp.dp_done)); | |
394 | } | |
57d1b188 | 395 | |
a8ac0b89 | 396 | return 0; |
57d1b188 | 397 | } |
398 | EXPORT_SYMBOL(spl_debug_dumplog); | |
399 | ||
400 | static char * | |
401 | trace_get_console_buffer(void) | |
402 | { | |
403 | int cpu = get_cpu(); | |
404 | int idx; | |
405 | ||
406 | if (in_irq()) { | |
407 | idx = 0; | |
408 | } else if (in_softirq()) { | |
409 | idx = 1; | |
410 | } else { | |
411 | idx = 2; | |
412 | } | |
413 | ||
414 | return trace_console_buffers[cpu][idx]; | |
415 | } | |
416 | ||
417 | static void | |
418 | trace_put_console_buffer(char *buffer) | |
419 | { | |
420 | put_cpu(); | |
421 | } | |
422 | ||
f6c81c5e | 423 | static int |
424 | trace_lock_tcd(struct trace_cpu_data *tcd) | |
57d1b188 | 425 | { |
f6c81c5e | 426 | __ASSERT(tcd->tcd_type < TCD_TYPE_MAX); |
57d1b188 | 427 | |
f6c81c5e | 428 | spin_lock_irqsave(&tcd->tcd_lock, tcd->tcd_lock_flags); |
57d1b188 | 429 | |
f6c81c5e | 430 | return 1; |
57d1b188 | 431 | } |
432 | ||
433 | static void | |
f6c81c5e | 434 | trace_unlock_tcd(struct trace_cpu_data *tcd) |
57d1b188 | 435 | { |
f6c81c5e | 436 | __ASSERT(tcd->tcd_type < TCD_TYPE_MAX); |
437 | ||
438 | spin_unlock_irqrestore(&tcd->tcd_lock, tcd->tcd_lock_flags); | |
57d1b188 | 439 | } |
440 | ||
f6c81c5e | 441 | static struct trace_cpu_data * |
442 | trace_get_tcd(void) | |
57d1b188 | 443 | { |
f6c81c5e | 444 | int cpu; |
445 | struct trace_cpu_data *tcd; | |
446 | ||
447 | cpu = get_cpu(); | |
448 | if (in_irq()) | |
449 | tcd = &(*trace_data[TCD_TYPE_IRQ])[cpu].tcd; | |
450 | else if (in_softirq()) | |
451 | tcd = &(*trace_data[TCD_TYPE_SOFTIRQ])[cpu].tcd; | |
452 | else | |
453 | tcd = &(*trace_data[TCD_TYPE_PROC])[cpu].tcd; | |
57d1b188 | 454 | |
f6c81c5e | 455 | trace_lock_tcd(tcd); |
57d1b188 | 456 | |
f6c81c5e | 457 | return tcd; |
57d1b188 | 458 | } |
459 | ||
460 | static void | |
f6c81c5e | 461 | trace_put_tcd (struct trace_cpu_data *tcd) |
57d1b188 | 462 | { |
f6c81c5e | 463 | trace_unlock_tcd(tcd); |
57d1b188 | 464 | |
f6c81c5e | 465 | put_cpu(); |
57d1b188 | 466 | } |
467 | ||
468 | static void | |
469 | trace_set_debug_header(struct spl_debug_header *header, int subsys, | |
470 | int mask, const int line, unsigned long stack) | |
471 | { | |
472 | struct timeval tv; | |
473 | ||
474 | do_gettimeofday(&tv); | |
475 | ||
476 | header->ph_subsys = subsys; | |
477 | header->ph_mask = mask; | |
478 | header->ph_cpu_id = smp_processor_id(); | |
479 | header->ph_sec = (__u32)tv.tv_sec; | |
480 | header->ph_usec = tv.tv_usec; | |
481 | header->ph_stack = stack; | |
482 | header->ph_pid = current->pid; | |
483 | header->ph_line_num = line; | |
484 | ||
485 | return; | |
486 | } | |
487 | ||
488 | static void | |
489 | trace_print_to_console(struct spl_debug_header *hdr, int mask, const char *buf, | |
490 | int len, const char *file, const char *fn) | |
491 | { | |
492 | char *prefix = "SPL", *ptype = NULL; | |
493 | ||
494 | if ((mask & D_EMERG) != 0) { | |
495 | prefix = "SPLError"; | |
496 | ptype = KERN_EMERG; | |
497 | } else if ((mask & D_ERROR) != 0) { | |
498 | prefix = "SPLError"; | |
499 | ptype = KERN_ERR; | |
500 | } else if ((mask & D_WARNING) != 0) { | |
501 | prefix = "SPL"; | |
502 | ptype = KERN_WARNING; | |
503 | } else if ((mask & (D_CONSOLE | spl_debug_printk)) != 0) { | |
504 | prefix = "SPL"; | |
505 | ptype = KERN_INFO; | |
506 | } | |
507 | ||
508 | if ((mask & D_CONSOLE) != 0) { | |
509 | printk("%s%s: %.*s", ptype, prefix, len, buf); | |
510 | } else { | |
892d5106 | 511 | printk("%s%s: %d:%d:(%s:%d:%s()) %.*s", ptype, prefix, |
512 | hdr->ph_pid, hdr->ph_stack, file, | |
513 | hdr->ph_line_num, fn, len, buf); | |
57d1b188 | 514 | } |
515 | ||
516 | return; | |
517 | } | |
518 | ||
519 | static int | |
520 | trace_max_debug_mb(void) | |
521 | { | |
522 | return MAX(512, ((num_physpages >> (20 - PAGE_SHIFT)) * 80) / 100); | |
523 | } | |
524 | ||
57d1b188 | 525 | static struct trace_page * |
526 | tage_alloc(int gfp) | |
527 | { | |
528 | struct page *page; | |
529 | struct trace_page *tage; | |
530 | ||
531 | page = alloc_pages(gfp | __GFP_NOWARN, 0); | |
532 | if (page == NULL) | |
533 | return NULL; | |
534 | ||
535 | tage = kmalloc(sizeof(*tage), gfp); | |
536 | if (tage == NULL) { | |
537 | __free_pages(page, 0); | |
538 | return NULL; | |
539 | } | |
540 | ||
541 | tage->page = page; | |
542 | atomic_inc(&trace_tage_allocated); | |
543 | ||
544 | return tage; | |
545 | } | |
546 | ||
547 | static void | |
548 | tage_free(struct trace_page *tage) | |
549 | { | |
550 | __ASSERT(tage != NULL); | |
551 | __ASSERT(tage->page != NULL); | |
552 | ||
553 | __free_pages(tage->page, 0); | |
554 | kfree(tage); | |
555 | atomic_dec(&trace_tage_allocated); | |
556 | } | |
557 | ||
558 | static struct trace_page * | |
559 | tage_from_list(struct list_head *list) | |
560 | { | |
561 | return list_entry(list, struct trace_page, linkage); | |
562 | } | |
563 | ||
564 | static void | |
565 | tage_to_tail(struct trace_page *tage, struct list_head *queue) | |
566 | { | |
567 | __ASSERT(tage != NULL); | |
568 | __ASSERT(queue != NULL); | |
569 | ||
570 | list_move_tail(&tage->linkage, queue); | |
571 | } | |
572 | ||
573 | /* try to return a page that has 'len' bytes left at the end */ | |
574 | static struct trace_page * | |
575 | trace_get_tage_try(struct trace_cpu_data *tcd, unsigned long len) | |
576 | { | |
577 | struct trace_page *tage; | |
578 | ||
579 | if (tcd->tcd_cur_pages > 0) { | |
580 | __ASSERT(!list_empty(&tcd->tcd_pages)); | |
581 | tage = tage_from_list(tcd->tcd_pages.prev); | |
582 | if (tage->used + len <= PAGE_SIZE) | |
583 | return tage; | |
584 | } | |
585 | ||
586 | if (tcd->tcd_cur_pages < tcd->tcd_max_pages) { | |
587 | if (tcd->tcd_cur_stock_pages > 0) { | |
588 | tage = tage_from_list(tcd->tcd_stock_pages.prev); | |
589 | tcd->tcd_cur_stock_pages--; | |
590 | list_del_init(&tage->linkage); | |
591 | } else { | |
592 | tage = tage_alloc(GFP_ATOMIC); | |
593 | if (tage == NULL) { | |
594 | printk(KERN_WARNING | |
595 | "failure to allocate a tage (%ld)\n", | |
596 | tcd->tcd_cur_pages); | |
597 | return NULL; | |
598 | } | |
599 | } | |
600 | ||
601 | tage->used = 0; | |
602 | tage->cpu = smp_processor_id(); | |
603 | tage->type = tcd->tcd_type; | |
604 | list_add_tail(&tage->linkage, &tcd->tcd_pages); | |
605 | tcd->tcd_cur_pages++; | |
606 | ||
607 | return tage; | |
608 | } | |
609 | ||
610 | return NULL; | |
611 | } | |
612 | ||
613 | /* return a page that has 'len' bytes left at the end */ | |
614 | static struct trace_page * | |
615 | trace_get_tage(struct trace_cpu_data *tcd, unsigned long len) | |
616 | { | |
617 | struct trace_page *tage; | |
618 | ||
619 | __ASSERT(len <= PAGE_SIZE); | |
620 | ||
621 | tage = trace_get_tage_try(tcd, len); | |
622 | if (tage) | |
623 | return tage; | |
624 | ||
625 | if (tcd->tcd_cur_pages > 0) { | |
626 | tage = tage_from_list(tcd->tcd_pages.next); | |
627 | tage->used = 0; | |
628 | tage_to_tail(tage, &tcd->tcd_pages); | |
629 | } | |
630 | ||
631 | return tage; | |
632 | } | |
633 | ||
634 | int | |
635 | spl_debug_vmsg(spl_debug_limit_state_t *cdls, int subsys, int mask, | |
636 | const char *file, const char *fn, const int line, | |
637 | const char *format1, va_list args, const char *format2, ...) | |
638 | { | |
639 | struct trace_cpu_data *tcd = NULL; | |
b02e9b24 | 640 | struct spl_debug_header header = { 0, }; |
57d1b188 | 641 | struct trace_page *tage; |
642 | /* string_buf is used only if tcd != NULL, and is always set then */ | |
643 | char *string_buf = NULL; | |
644 | char *debug_buf; | |
645 | int known_size; | |
646 | int needed = 85; /* average message length */ | |
647 | int max_nob; | |
648 | va_list ap; | |
649 | int i; | |
650 | int remain; | |
651 | ||
652 | if (strchr(file, '/')) | |
653 | file = strrchr(file, '/') + 1; | |
654 | ||
655 | trace_set_debug_header(&header, subsys, mask, line, CDEBUG_STACK()); | |
656 | ||
657 | tcd = trace_get_tcd(); | |
658 | if (tcd == NULL) | |
659 | goto console; | |
660 | ||
661 | if (tcd->tcd_shutting_down) { | |
662 | trace_put_tcd(tcd); | |
663 | tcd = NULL; | |
664 | goto console; | |
665 | } | |
666 | ||
667 | known_size = strlen(file) + 1; | |
668 | if (fn) | |
669 | known_size += strlen(fn) + 1; | |
670 | ||
671 | if (spl_debug_binary) | |
672 | known_size += sizeof(header); | |
673 | ||
674 | /* '2' used because vsnprintf returns real size required for output | |
675 | * _without_ terminating NULL. */ | |
676 | for (i = 0; i < 2; i++) { | |
677 | tage = trace_get_tage(tcd, needed + known_size + 1); | |
678 | if (tage == NULL) { | |
679 | if (needed + known_size > PAGE_SIZE) | |
680 | mask |= D_ERROR; | |
681 | ||
682 | trace_put_tcd(tcd); | |
683 | tcd = NULL; | |
684 | goto console; | |
685 | } | |
686 | ||
687 | string_buf = (char *)page_address(tage->page) + | |
688 | tage->used + known_size; | |
689 | ||
690 | max_nob = PAGE_SIZE - tage->used - known_size; | |
691 | if (max_nob <= 0) { | |
692 | printk(KERN_EMERG "negative max_nob: %i\n", max_nob); | |
693 | mask |= D_ERROR; | |
694 | trace_put_tcd(tcd); | |
695 | tcd = NULL; | |
696 | goto console; | |
697 | } | |
698 | ||
699 | needed = 0; | |
700 | if (format1) { | |
701 | va_copy(ap, args); | |
702 | needed = vsnprintf(string_buf, max_nob, format1, ap); | |
703 | va_end(ap); | |
704 | } | |
705 | ||
706 | if (format2) { | |
707 | remain = max_nob - needed; | |
708 | if (remain < 0) | |
709 | remain = 0; | |
710 | ||
711 | va_start(ap, format2); | |
712 | needed += vsnprintf(string_buf+needed, remain, format2, ap); | |
713 | va_end(ap); | |
714 | } | |
715 | ||
716 | if (needed < max_nob) | |
717 | break; | |
718 | } | |
719 | ||
57d1b188 | 720 | header.ph_len = known_size + needed; |
721 | debug_buf = (char *)page_address(tage->page) + tage->used; | |
722 | ||
723 | if (spl_debug_binary) { | |
724 | memcpy(debug_buf, &header, sizeof(header)); | |
725 | tage->used += sizeof(header); | |
726 | debug_buf += sizeof(header); | |
727 | } | |
728 | ||
729 | strcpy(debug_buf, file); | |
730 | tage->used += strlen(file) + 1; | |
731 | debug_buf += strlen(file) + 1; | |
732 | ||
733 | if (fn) { | |
734 | strcpy(debug_buf, fn); | |
735 | tage->used += strlen(fn) + 1; | |
736 | debug_buf += strlen(fn) + 1; | |
737 | } | |
738 | ||
739 | __ASSERT(debug_buf == string_buf); | |
740 | ||
741 | tage->used += needed; | |
742 | __ASSERT (tage->used <= PAGE_SIZE); | |
743 | ||
744 | console: | |
745 | if ((mask & spl_debug_printk) == 0) { | |
746 | /* no console output requested */ | |
747 | if (tcd != NULL) | |
748 | trace_put_tcd(tcd); | |
749 | return 1; | |
750 | } | |
751 | ||
752 | if (cdls != NULL) { | |
753 | if (spl_console_ratelimit && cdls->cdls_next != 0 && | |
754 | !time_before(cdls->cdls_next, jiffies)) { | |
755 | /* skipping a console message */ | |
756 | cdls->cdls_count++; | |
757 | if (tcd != NULL) | |
758 | trace_put_tcd(tcd); | |
759 | return 1; | |
760 | } | |
761 | ||
762 | if (time_before(cdls->cdls_next + spl_console_max_delay + | |
763 | (10 * HZ), jiffies)) { | |
764 | /* last timeout was a long time ago */ | |
765 | cdls->cdls_delay /= spl_console_backoff * 4; | |
766 | } else { | |
767 | cdls->cdls_delay *= spl_console_backoff; | |
768 | ||
769 | if (cdls->cdls_delay < spl_console_min_delay) | |
770 | cdls->cdls_delay = spl_console_min_delay; | |
771 | else if (cdls->cdls_delay > spl_console_max_delay) | |
772 | cdls->cdls_delay = spl_console_max_delay; | |
773 | } | |
774 | ||
775 | /* ensure cdls_next is never zero after it's been seen */ | |
776 | cdls->cdls_next = (jiffies + cdls->cdls_delay) | 1; | |
777 | } | |
778 | ||
779 | if (tcd != NULL) { | |
780 | trace_print_to_console(&header, mask, string_buf, needed, file, fn); | |
781 | trace_put_tcd(tcd); | |
782 | } else { | |
783 | string_buf = trace_get_console_buffer(); | |
784 | ||
785 | needed = 0; | |
786 | if (format1 != NULL) { | |
787 | va_copy(ap, args); | |
788 | needed = vsnprintf(string_buf, TRACE_CONSOLE_BUFFER_SIZE, format1, ap); | |
789 | va_end(ap); | |
790 | } | |
791 | if (format2 != NULL) { | |
792 | remain = TRACE_CONSOLE_BUFFER_SIZE - needed; | |
793 | if (remain > 0) { | |
794 | va_start(ap, format2); | |
795 | needed += vsnprintf(string_buf+needed, remain, format2, ap); | |
796 | va_end(ap); | |
797 | } | |
798 | } | |
799 | trace_print_to_console(&header, mask, | |
800 | string_buf, needed, file, fn); | |
801 | ||
802 | trace_put_console_buffer(string_buf); | |
803 | } | |
804 | ||
805 | if (cdls != NULL && cdls->cdls_count != 0) { | |
806 | string_buf = trace_get_console_buffer(); | |
807 | ||
808 | needed = snprintf(string_buf, TRACE_CONSOLE_BUFFER_SIZE, | |
809 | "Skipped %d previous similar message%s\n", | |
810 | cdls->cdls_count, (cdls->cdls_count > 1) ? "s" : ""); | |
811 | ||
812 | trace_print_to_console(&header, mask, | |
813 | string_buf, needed, file, fn); | |
814 | ||
815 | trace_put_console_buffer(string_buf); | |
816 | cdls->cdls_count = 0; | |
817 | } | |
818 | ||
819 | return 0; | |
820 | } | |
821 | EXPORT_SYMBOL(spl_debug_vmsg); | |
822 | ||
823 | /* Do the collect_pages job on a single CPU: assumes that all other | |
824 | * CPUs have been stopped during a panic. If this isn't true for | |
825 | * some arch, this will have to be implemented separately in each arch. | |
826 | */ | |
827 | static void | |
7fea96c0 | 828 | collect_pages_from_single_cpu(struct page_collection *pc) |
57d1b188 | 829 | { |
830 | struct trace_cpu_data *tcd; | |
831 | int i, j; | |
832 | ||
833 | tcd_for_each(tcd, i, j) { | |
834 | list_splice_init(&tcd->tcd_pages, &pc->pc_pages); | |
835 | tcd->tcd_cur_pages = 0; | |
836 | } | |
837 | } | |
838 | ||
839 | static void | |
f6c81c5e | 840 | collect_pages_on_all_cpus(struct page_collection *pc) |
57d1b188 | 841 | { |
842 | struct trace_cpu_data *tcd; | |
f6c81c5e | 843 | int i, cpu; |
57d1b188 | 844 | |
845 | spin_lock(&pc->pc_lock); | |
f6c81c5e | 846 | for_each_possible_cpu(cpu) { |
847 | tcd_for_each_type_lock(tcd, i, cpu) { | |
848 | list_splice_init(&tcd->tcd_pages, &pc->pc_pages); | |
849 | tcd->tcd_cur_pages = 0; | |
850 | } | |
57d1b188 | 851 | } |
852 | spin_unlock(&pc->pc_lock); | |
853 | } | |
854 | ||
855 | static void | |
7fea96c0 | 856 | collect_pages(dumplog_priv_t *dp, struct page_collection *pc) |
57d1b188 | 857 | { |
858 | INIT_LIST_HEAD(&pc->pc_pages); | |
859 | ||
7fea96c0 | 860 | if (spl_panic_in_progress || dp->dp_flags & DL_SINGLE_CPU) |
861 | collect_pages_from_single_cpu(pc); | |
57d1b188 | 862 | else |
f6c81c5e | 863 | collect_pages_on_all_cpus(pc); |
57d1b188 | 864 | } |
865 | ||
866 | static void | |
f6c81c5e | 867 | put_pages_back_on_all_cpus(struct page_collection *pc) |
57d1b188 | 868 | { |
57d1b188 | 869 | struct trace_cpu_data *tcd; |
870 | struct list_head *cur_head; | |
871 | struct trace_page *tage; | |
872 | struct trace_page *tmp; | |
f6c81c5e | 873 | int i, cpu; |
57d1b188 | 874 | |
875 | spin_lock(&pc->pc_lock); | |
57d1b188 | 876 | |
f6c81c5e | 877 | for_each_possible_cpu(cpu) { |
878 | tcd_for_each_type_lock(tcd, i, cpu) { | |
879 | cur_head = tcd->tcd_pages.next; | |
57d1b188 | 880 | |
f6c81c5e | 881 | list_for_each_entry_safe(tage, tmp, &pc->pc_pages, |
882 | linkage) { | |
57d1b188 | 883 | |
f6c81c5e | 884 | __ASSERT_TAGE_INVARIANT(tage); |
885 | ||
886 | if (tage->cpu != cpu || tage->type != i) | |
887 | continue; | |
57d1b188 | 888 | |
f6c81c5e | 889 | tage_to_tail(tage, cur_head); |
890 | tcd->tcd_cur_pages++; | |
891 | } | |
57d1b188 | 892 | } |
893 | } | |
f6c81c5e | 894 | |
57d1b188 | 895 | spin_unlock(&pc->pc_lock); |
896 | } | |
897 | ||
898 | static void | |
899 | put_pages_back(struct page_collection *pc) | |
900 | { | |
901 | if (!spl_panic_in_progress) | |
f6c81c5e | 902 | put_pages_back_on_all_cpus(pc); |
57d1b188 | 903 | } |
904 | ||
905 | static struct file * | |
906 | trace_filp_open (const char *name, int flags, int mode, int *err) | |
907 | { | |
908 | struct file *filp = NULL; | |
909 | int rc; | |
910 | ||
911 | filp = filp_open(name, flags, mode); | |
912 | if (IS_ERR(filp)) { | |
913 | rc = PTR_ERR(filp); | |
914 | printk(KERN_ERR "SPL: Can't open %s file: %d\n", name, rc); | |
915 | if (err) | |
916 | *err = rc; | |
917 | filp = NULL; | |
918 | } | |
919 | return filp; | |
920 | } | |
921 | ||
922 | #define trace_filp_write(fp, b, s, p) (fp)->f_op->write((fp), (b), (s), p) | |
923 | #define trace_filp_fsync(fp) (fp)->f_op->fsync((fp),(fp)->f_dentry,1) | |
924 | #define trace_filp_close(f) filp_close(f, NULL) | |
925 | #define trace_filp_poff(f) (&(f)->f_pos) | |
926 | ||
927 | static int | |
7fea96c0 | 928 | spl_debug_dump_all_pages(dumplog_priv_t *dp, char *filename) |
57d1b188 | 929 | { |
930 | struct page_collection pc; | |
931 | struct file *filp; | |
932 | struct trace_page *tage; | |
933 | struct trace_page *tmp; | |
934 | mm_segment_t oldfs; | |
935 | int rc = 0; | |
936 | ||
937 | down_write(&trace_sem); | |
938 | ||
939 | filp = trace_filp_open(filename, O_CREAT|O_EXCL|O_WRONLY|O_LARGEFILE, | |
940 | 0600, &rc); | |
941 | if (filp == NULL) { | |
942 | if (rc != -EEXIST) | |
943 | printk(KERN_ERR "SPL: Can't open %s for dump: %d\n", | |
944 | filename, rc); | |
945 | goto out; | |
946 | } | |
947 | ||
948 | spin_lock_init(&pc.pc_lock); | |
7fea96c0 | 949 | collect_pages(dp, &pc); |
57d1b188 | 950 | if (list_empty(&pc.pc_pages)) { |
951 | rc = 0; | |
952 | goto close; | |
953 | } | |
954 | ||
955 | oldfs = get_fs(); | |
956 | set_fs(get_ds()); | |
957 | ||
958 | list_for_each_entry_safe(tage, tmp, &pc.pc_pages, linkage) { | |
959 | __ASSERT_TAGE_INVARIANT(tage); | |
960 | ||
961 | rc = trace_filp_write(filp, page_address(tage->page), | |
962 | tage->used, trace_filp_poff(filp)); | |
963 | if (rc != (int)tage->used) { | |
964 | printk(KERN_WARNING "SPL: Wanted to write %u " | |
965 | "but wrote %d\n", tage->used, rc); | |
966 | put_pages_back(&pc); | |
967 | __ASSERT(list_empty(&pc.pc_pages)); | |
968 | break; | |
969 | } | |
970 | list_del(&tage->linkage); | |
971 | tage_free(tage); | |
972 | } | |
973 | ||
974 | set_fs(oldfs); | |
975 | ||
976 | rc = trace_filp_fsync(filp); | |
977 | if (rc) | |
978 | printk(KERN_ERR "SPL: Unable to sync: %d\n", rc); | |
979 | close: | |
980 | trace_filp_close(filp); | |
981 | out: | |
982 | up_write(&trace_sem); | |
983 | ||
984 | return rc; | |
985 | } | |
986 | ||
987 | static void | |
988 | spl_debug_flush_pages(void) | |
989 | { | |
7fea96c0 | 990 | dumplog_priv_t dp; |
57d1b188 | 991 | struct page_collection pc; |
992 | struct trace_page *tage; | |
993 | struct trace_page *tmp; | |
994 | ||
995 | spin_lock_init(&pc.pc_lock); | |
7fea96c0 | 996 | init_waitqueue_head(&dp.dp_waitq); |
997 | dp.dp_pid = current->pid; | |
998 | dp.dp_flags = 0; | |
999 | atomic_set(&dp.dp_done, 0); | |
57d1b188 | 1000 | |
7fea96c0 | 1001 | collect_pages(&dp, &pc); |
57d1b188 | 1002 | list_for_each_entry_safe(tage, tmp, &pc.pc_pages, linkage) { |
1003 | __ASSERT_TAGE_INVARIANT(tage); | |
1004 | list_del(&tage->linkage); | |
1005 | tage_free(tage); | |
1006 | } | |
1007 | } | |
1008 | ||
1009 | unsigned long | |
1010 | spl_debug_set_mask(unsigned long mask) { | |
1011 | spl_debug_mask = mask; | |
1012 | return 0; | |
1013 | } | |
1014 | EXPORT_SYMBOL(spl_debug_set_mask); | |
1015 | ||
1016 | unsigned long | |
1017 | spl_debug_get_mask(void) { | |
1018 | return spl_debug_mask; | |
1019 | } | |
1020 | EXPORT_SYMBOL(spl_debug_get_mask); | |
1021 | ||
1022 | unsigned long | |
1023 | spl_debug_set_subsys(unsigned long subsys) { | |
1024 | spl_debug_subsys = subsys; | |
1025 | return 0; | |
1026 | } | |
1027 | EXPORT_SYMBOL(spl_debug_set_subsys); | |
1028 | ||
1029 | unsigned long | |
1030 | spl_debug_get_subsys(void) { | |
1031 | return spl_debug_subsys; | |
1032 | } | |
1033 | EXPORT_SYMBOL(spl_debug_get_subsys); | |
1034 | ||
1035 | int | |
1036 | spl_debug_set_mb(int mb) | |
1037 | { | |
1038 | int i, j, pages; | |
1039 | int limit = trace_max_debug_mb(); | |
1040 | struct trace_cpu_data *tcd; | |
1041 | ||
1042 | if (mb < num_possible_cpus()) { | |
1043 | printk(KERN_ERR "SPL: Refusing to set debug buffer size to " | |
1044 | "%dMB - lower limit is %d\n", mb, num_possible_cpus()); | |
1045 | return -EINVAL; | |
1046 | } | |
1047 | ||
1048 | if (mb > limit) { | |
1049 | printk(KERN_ERR "SPL: Refusing to set debug buffer size to " | |
1050 | "%dMB - upper limit is %d\n", mb, limit); | |
1051 | return -EINVAL; | |
1052 | } | |
1053 | ||
1054 | mb /= num_possible_cpus(); | |
1055 | pages = mb << (20 - PAGE_SHIFT); | |
1056 | ||
1057 | down_write(&trace_sem); | |
1058 | ||
1059 | tcd_for_each(tcd, i, j) | |
1060 | tcd->tcd_max_pages = (pages * tcd->tcd_pages_factor) / 100; | |
1061 | ||
1062 | up_write(&trace_sem); | |
1063 | ||
1064 | return 0; | |
1065 | } | |
1066 | EXPORT_SYMBOL(spl_debug_set_mb); | |
1067 | ||
1068 | int | |
1069 | spl_debug_get_mb(void) | |
1070 | { | |
1071 | int i, j; | |
1072 | struct trace_cpu_data *tcd; | |
1073 | int total_pages = 0; | |
1074 | ||
1075 | down_read(&trace_sem); | |
1076 | ||
1077 | tcd_for_each(tcd, i, j) | |
1078 | total_pages += tcd->tcd_max_pages; | |
1079 | ||
1080 | up_read(&trace_sem); | |
1081 | ||
1082 | return (total_pages >> (20 - PAGE_SHIFT)) + 1; | |
1083 | } | |
1084 | EXPORT_SYMBOL(spl_debug_get_mb); | |
1085 | ||
1086 | void spl_debug_dumpstack(struct task_struct *tsk) | |
1087 | { | |
1088 | extern void show_task(struct task_struct *); | |
1089 | ||
1090 | if (tsk == NULL) | |
1091 | tsk = current; | |
1092 | ||
892d5106 | 1093 | printk(KERN_ERR "SPL: Showing stack for process %d\n", tsk->pid); |
57d86234 | 1094 | dump_stack(); |
57d1b188 | 1095 | } |
1096 | EXPORT_SYMBOL(spl_debug_dumpstack); | |
1097 | ||
7fea96c0 | 1098 | void spl_debug_bug(char *file, const char *func, const int line, int flags) |
57d1b188 | 1099 | { |
1100 | spl_debug_catastrophe = 1; | |
937879f1 | 1101 | spl_debug_msg(NULL, 0, D_EMERG, file, func, line, "SBUG\n"); |
57d1b188 | 1102 | |
1103 | if (in_interrupt()) { | |
937879f1 | 1104 | panic("SBUG in interrupt.\n"); |
57d1b188 | 1105 | /* not reached */ |
1106 | } | |
1107 | ||
97f8f6d7 BB |
1108 | if (in_atomic() || irqs_disabled()) |
1109 | flags |= DL_NOTHREAD; | |
1110 | ||
57d1b188 | 1111 | /* Ensure all debug pages and dumped by current cpu */ |
1112 | if (spl_debug_panic_on_bug) | |
1113 | spl_panic_in_progress = 1; | |
1114 | ||
1115 | spl_debug_dumpstack(NULL); | |
7fea96c0 | 1116 | spl_debug_dumplog(flags); |
57d1b188 | 1117 | |
1118 | if (spl_debug_panic_on_bug) | |
937879f1 | 1119 | panic("SBUG"); |
57d1b188 | 1120 | |
1121 | set_task_state(current, TASK_UNINTERRUPTIBLE); | |
1122 | while (1) | |
1123 | schedule(); | |
1124 | } | |
1125 | EXPORT_SYMBOL(spl_debug_bug); | |
1126 | ||
1127 | int | |
1128 | spl_debug_clear_buffer(void) | |
1129 | { | |
1130 | spl_debug_flush_pages(); | |
1131 | return 0; | |
1132 | } | |
1133 | EXPORT_SYMBOL(spl_debug_clear_buffer); | |
1134 | ||
1135 | int | |
1136 | spl_debug_mark_buffer(char *text) | |
1137 | { | |
1138 | CDEBUG(D_WARNING, "*************************************\n"); | |
1139 | CDEBUG(D_WARNING, "DEBUG MARKER: %s\n", text); | |
1140 | CDEBUG(D_WARNING, "*************************************\n"); | |
1141 | ||
1142 | return 0; | |
1143 | } | |
1144 | EXPORT_SYMBOL(spl_debug_mark_buffer); | |
1145 | ||
57d1b188 | 1146 | static int |
1147 | trace_init(int max_pages) | |
1148 | { | |
1149 | struct trace_cpu_data *tcd; | |
1150 | int i, j; | |
1151 | ||
1152 | init_rwsem(&trace_sem); | |
1153 | ||
1154 | /* initialize trace_data */ | |
1155 | memset(trace_data, 0, sizeof(trace_data)); | |
1156 | for (i = 0; i < TCD_TYPE_MAX; i++) { | |
1157 | trace_data[i] = kmalloc(sizeof(union trace_data_union) * | |
1158 | NR_CPUS, GFP_KERNEL); | |
1159 | if (trace_data[i] == NULL) | |
1160 | goto out; | |
1161 | } | |
1162 | ||
1163 | tcd_for_each(tcd, i, j) { | |
f6c81c5e | 1164 | spin_lock_init(&tcd->tcd_lock); |
57d1b188 | 1165 | tcd->tcd_pages_factor = pages_factor[i]; |
1166 | tcd->tcd_type = i; | |
1167 | tcd->tcd_cpu = j; | |
1168 | INIT_LIST_HEAD(&tcd->tcd_pages); | |
1169 | INIT_LIST_HEAD(&tcd->tcd_stock_pages); | |
1170 | tcd->tcd_cur_pages = 0; | |
1171 | tcd->tcd_cur_stock_pages = 0; | |
1172 | tcd->tcd_max_pages = (max_pages * pages_factor[i]) / 100; | |
1173 | tcd->tcd_shutting_down = 0; | |
1174 | } | |
1175 | ||
1176 | for (i = 0; i < num_possible_cpus(); i++) { | |
1177 | for (j = 0; j < 3; j++) { | |
1178 | trace_console_buffers[i][j] = | |
1179 | kmalloc(TRACE_CONSOLE_BUFFER_SIZE, | |
1180 | GFP_KERNEL); | |
1181 | ||
1182 | if (trace_console_buffers[i][j] == NULL) | |
1183 | goto out; | |
1184 | } | |
1185 | } | |
1186 | ||
1187 | return 0; | |
1188 | out: | |
1189 | trace_fini(); | |
1190 | printk(KERN_ERR "SPL: Insufficient memory for debug logs\n"); | |
1191 | return -ENOMEM; | |
1192 | } | |
1193 | ||
1194 | int | |
1195 | debug_init(void) | |
1196 | { | |
1197 | int rc, max = spl_debug_mb; | |
1198 | ||
1199 | spl_console_max_delay = SPL_DEFAULT_MAX_DELAY; | |
1200 | spl_console_min_delay = SPL_DEFAULT_MIN_DELAY; | |
1201 | ||
1202 | /* If spl_debug_mb is set to an invalid value or uninitialized | |
1203 | * then just make the total buffers smp_num_cpus TCD_MAX_PAGES */ | |
1204 | if (max > (num_physpages >> (20 - 2 - PAGE_SHIFT)) / 5 || | |
1205 | max >= 512 || max < 0) { | |
1206 | max = TCD_MAX_PAGES; | |
1207 | } else { | |
1208 | max = (max / num_online_cpus()) << (20 - PAGE_SHIFT); | |
1209 | } | |
1210 | ||
1211 | rc = trace_init(max); | |
1212 | if (rc) | |
1213 | return rc; | |
1214 | ||
d50bd9e2 | 1215 | return rc; |
57d1b188 | 1216 | } |
1217 | ||
1218 | static void | |
f6c81c5e | 1219 | trace_cleanup_on_all_cpus(void) |
57d1b188 | 1220 | { |
1221 | struct trace_cpu_data *tcd; | |
1222 | struct trace_page *tage; | |
1223 | struct trace_page *tmp; | |
f6c81c5e | 1224 | int i, cpu; |
57d1b188 | 1225 | |
f6c81c5e | 1226 | for_each_possible_cpu(cpu) { |
1227 | tcd_for_each_type_lock(tcd, i, cpu) { | |
1228 | tcd->tcd_shutting_down = 1; | |
57d1b188 | 1229 | |
f6c81c5e | 1230 | list_for_each_entry_safe(tage, tmp, &tcd->tcd_pages, |
1231 | linkage) { | |
1232 | __ASSERT_TAGE_INVARIANT(tage); | |
57d1b188 | 1233 | |
f6c81c5e | 1234 | list_del(&tage->linkage); |
1235 | tage_free(tage); | |
1236 | } | |
1237 | tcd->tcd_cur_pages = 0; | |
57d1b188 | 1238 | } |
57d1b188 | 1239 | } |
1240 | } | |
1241 | ||
1242 | static void | |
1243 | trace_fini(void) | |
1244 | { | |
1245 | int i, j; | |
1246 | ||
f6c81c5e | 1247 | trace_cleanup_on_all_cpus(); |
57d1b188 | 1248 | |
1249 | for (i = 0; i < num_possible_cpus(); i++) { | |
1250 | for (j = 0; j < 3; j++) { | |
1251 | if (trace_console_buffers[i][j] != NULL) { | |
1252 | kfree(trace_console_buffers[i][j]); | |
1253 | trace_console_buffers[i][j] = NULL; | |
1254 | } | |
1255 | } | |
1256 | } | |
1257 | ||
124ca8a5 | 1258 | for (i = 0; i < TCD_TYPE_MAX && trace_data[i] != NULL; i++) { |
57d1b188 | 1259 | kfree(trace_data[i]); |
1260 | trace_data[i] = NULL; | |
1261 | } | |
1262 | } | |
1263 | ||
1264 | void | |
1265 | debug_fini(void) | |
1266 | { | |
57d1b188 | 1267 | trace_fini(); |
57d1b188 | 1268 | } |