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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> |
ae4c36ad | 37 | #include <linux/proc_compat.h> |
f0ff89fc | 38 | #include <linux/file_compat.h> |
57d1b188 | 39 | #include <sys/sysmacros.h> |
57d1b188 | 40 | #include <sys/debug.h> |
41 | #include <spl-ctl.h> | |
57d1b188 | 42 | |
43 | #ifdef DEBUG_SUBSYSTEM | |
44 | #undef DEBUG_SUBSYSTEM | |
45 | #endif | |
46 | ||
47 | #define DEBUG_SUBSYSTEM S_DEBUG | |
48 | ||
49 | unsigned long spl_debug_subsys = ~0; | |
50 | EXPORT_SYMBOL(spl_debug_subsys); | |
51 | module_param(spl_debug_subsys, long, 0644); | |
52 | MODULE_PARM_DESC(spl_debug_subsys, "Subsystem debugging level mask."); | |
53 | ||
54 | unsigned long spl_debug_mask = (D_EMERG | D_ERROR | D_WARNING | D_CONSOLE); | |
55 | EXPORT_SYMBOL(spl_debug_mask); | |
56 | module_param(spl_debug_mask, long, 0644); | |
57 | MODULE_PARM_DESC(spl_debug_mask, "Debugging level mask."); | |
58 | ||
59 | unsigned long spl_debug_printk = D_CANTMASK; | |
60 | EXPORT_SYMBOL(spl_debug_printk); | |
61 | module_param(spl_debug_printk, long, 0644); | |
62 | MODULE_PARM_DESC(spl_debug_printk, "Console printk level mask."); | |
63 | ||
64 | int spl_debug_mb = -1; | |
65 | EXPORT_SYMBOL(spl_debug_mb); | |
66 | module_param(spl_debug_mb, int, 0644); | |
67 | MODULE_PARM_DESC(spl_debug_mb, "Total debug buffer size."); | |
68 | ||
69 | unsigned int spl_debug_binary = 1; | |
70 | EXPORT_SYMBOL(spl_debug_binary); | |
71 | ||
72 | unsigned int spl_debug_catastrophe; | |
73 | EXPORT_SYMBOL(spl_debug_catastrophe); | |
74 | ||
3626ae6a | 75 | unsigned int spl_debug_panic_on_bug = 0; |
57d1b188 | 76 | EXPORT_SYMBOL(spl_debug_panic_on_bug); |
77 | module_param(spl_debug_panic_on_bug, int, 0644); | |
78 | MODULE_PARM_DESC(spl_debug_panic_on_bug, "Panic on BUG"); | |
79 | ||
80 | static char spl_debug_file_name[PATH_MAX]; | |
627a7497 | 81 | char spl_debug_file_path[PATH_MAX] = "/tmp/spl-log"; |
57d1b188 | 82 | |
83 | unsigned int spl_console_ratelimit = 1; | |
84 | EXPORT_SYMBOL(spl_console_ratelimit); | |
85 | ||
86 | long spl_console_max_delay; | |
87 | EXPORT_SYMBOL(spl_console_max_delay); | |
88 | ||
89 | long spl_console_min_delay; | |
90 | EXPORT_SYMBOL(spl_console_min_delay); | |
91 | ||
92 | unsigned int spl_console_backoff = SPL_DEFAULT_BACKOFF; | |
93 | EXPORT_SYMBOL(spl_console_backoff); | |
94 | ||
95 | unsigned int spl_debug_stack; | |
96 | EXPORT_SYMBOL(spl_debug_stack); | |
97 | ||
98 | static int spl_panic_in_progress; | |
99 | ||
100 | union trace_data_union (*trace_data[TCD_TYPE_MAX])[NR_CPUS] __cacheline_aligned; | |
101 | char *trace_console_buffers[NR_CPUS][3]; | |
102 | struct rw_semaphore trace_sem; | |
103 | atomic_t trace_tage_allocated = ATOMIC_INIT(0); | |
104 | ||
7fea96c0 | 105 | static int spl_debug_dump_all_pages(dumplog_priv_t *dp, char *); |
57d1b188 | 106 | static void trace_fini(void); |
107 | ||
108 | ||
109 | /* Memory percentage breakdown by type */ | |
110 | static unsigned int pages_factor[TCD_TYPE_MAX] = { | |
111 | 80, /* 80% pages for TCD_TYPE_PROC */ | |
112 | 10, /* 10% pages for TCD_TYPE_SOFTIRQ */ | |
113 | 10 /* 10% pages for TCD_TYPE_IRQ */ | |
114 | }; | |
115 | ||
57d1b188 | 116 | const char * |
117 | spl_debug_subsys2str(int subsys) | |
118 | { | |
119 | switch (subsys) { | |
120 | default: | |
121 | return NULL; | |
122 | case S_UNDEFINED: | |
123 | return "undefined"; | |
124 | case S_ATOMIC: | |
125 | return "atomic"; | |
126 | case S_KOBJ: | |
127 | return "kobj"; | |
128 | case S_VNODE: | |
129 | return "vnode"; | |
130 | case S_TIME: | |
131 | return "time"; | |
132 | case S_RWLOCK: | |
133 | return "rwlock"; | |
134 | case S_THREAD: | |
135 | return "thread"; | |
136 | case S_CONDVAR: | |
137 | return "condvar"; | |
138 | case S_MUTEX: | |
139 | return "mutex"; | |
140 | case S_RNG: | |
141 | return "rng"; | |
142 | case S_TASKQ: | |
143 | return "taskq"; | |
144 | case S_KMEM: | |
145 | return "kmem"; | |
e5bbd245 | 146 | case S_DEBUG: |
147 | return "debug"; | |
148 | case S_GENERIC: | |
149 | return "generic"; | |
150 | case S_PROC: | |
151 | return "proc"; | |
152 | case S_MODULE: | |
153 | return "module"; | |
ec7d53e9 BB |
154 | case S_CRED: |
155 | return "cred"; | |
57d1b188 | 156 | } |
157 | } | |
158 | ||
159 | const char * | |
160 | spl_debug_dbg2str(int debug) | |
161 | { | |
162 | switch (debug) { | |
163 | default: | |
164 | return NULL; | |
165 | case D_TRACE: | |
166 | return "trace"; | |
167 | case D_INFO: | |
168 | return "info"; | |
169 | case D_WARNING: | |
170 | return "warning"; | |
171 | case D_ERROR: | |
172 | return "error"; | |
173 | case D_EMERG: | |
174 | return "emerg"; | |
175 | case D_CONSOLE: | |
176 | return "console"; | |
177 | case D_IOCTL: | |
178 | return "ioctl"; | |
179 | case D_DPRINTF: | |
180 | return "dprintf"; | |
181 | case D_OTHER: | |
182 | return "other"; | |
183 | } | |
184 | } | |
185 | ||
186 | int | |
187 | spl_debug_mask2str(char *str, int size, unsigned long mask, int is_subsys) | |
188 | { | |
189 | const char *(*fn)(int bit) = is_subsys ? spl_debug_subsys2str : | |
190 | spl_debug_dbg2str; | |
191 | const char *token; | |
192 | int i, bit, len = 0; | |
193 | ||
194 | if (mask == 0) { /* "0" */ | |
195 | if (size > 0) | |
196 | str[0] = '0'; | |
197 | len = 1; | |
198 | } else { /* space-separated tokens */ | |
199 | for (i = 0; i < 32; i++) { | |
200 | bit = 1 << i; | |
201 | ||
202 | if ((mask & bit) == 0) | |
203 | continue; | |
204 | ||
205 | token = fn(bit); | |
206 | if (token == NULL) /* unused bit */ | |
207 | continue; | |
208 | ||
209 | if (len > 0) { /* separator? */ | |
210 | if (len < size) | |
211 | str[len] = ' '; | |
212 | len++; | |
213 | } | |
214 | ||
215 | while (*token != 0) { | |
216 | if (len < size) | |
217 | str[len] = *token; | |
218 | token++; | |
219 | len++; | |
220 | } | |
221 | } | |
222 | } | |
223 | ||
224 | /* terminate 'str' */ | |
225 | if (len < size) | |
226 | str[len] = 0; | |
227 | else | |
228 | str[size - 1] = 0; | |
229 | ||
230 | return len; | |
231 | } | |
232 | ||
233 | static int | |
234 | spl_debug_token2mask(int *mask, const char *str, int len, int is_subsys) | |
235 | { | |
236 | const char *(*fn)(int bit) = is_subsys ? spl_debug_subsys2str : | |
237 | spl_debug_dbg2str; | |
238 | const char *token; | |
239 | int i, j, bit; | |
240 | ||
241 | /* match against known tokens */ | |
242 | for (i = 0; i < 32; i++) { | |
243 | bit = 1 << i; | |
244 | ||
245 | token = fn(bit); | |
246 | if (token == NULL) /* unused? */ | |
247 | continue; | |
248 | ||
249 | /* strcasecmp */ | |
250 | for (j = 0; ; j++) { | |
251 | if (j == len) { /* end of token */ | |
252 | if (token[j] == 0) { | |
253 | *mask = bit; | |
254 | return 0; | |
255 | } | |
256 | break; | |
257 | } | |
258 | ||
259 | if (token[j] == 0) | |
260 | break; | |
261 | ||
262 | if (str[j] == token[j]) | |
263 | continue; | |
264 | ||
265 | if (str[j] < 'A' || 'Z' < str[j]) | |
266 | break; | |
267 | ||
268 | if (str[j] - 'A' + 'a' != token[j]) | |
269 | break; | |
270 | } | |
271 | } | |
272 | ||
273 | return -EINVAL; /* no match */ | |
274 | } | |
275 | ||
276 | int | |
277 | spl_debug_str2mask(unsigned long *mask, const char *str, int is_subsys) | |
278 | { | |
279 | char op = 0; | |
280 | int m = 0, matched, n, t; | |
281 | ||
282 | /* Allow a number for backwards compatibility */ | |
283 | for (n = strlen(str); n > 0; n--) | |
284 | if (!isspace(str[n-1])) | |
285 | break; | |
286 | matched = n; | |
287 | ||
288 | if ((t = sscanf(str, "%i%n", &m, &matched)) >= 1 && matched == n) { | |
289 | *mask = m; | |
290 | return 0; | |
291 | } | |
292 | ||
293 | /* <str> must be a list of debug tokens or numbers separated by | |
294 | * whitespace and optionally an operator ('+' or '-'). If an operator | |
295 | * appears first in <str>, '*mask' is used as the starting point | |
296 | * (relative), otherwise 0 is used (absolute). An operator applies to | |
297 | * all following tokens up to the next operator. */ | |
298 | matched = 0; | |
299 | while (*str != 0) { | |
300 | while (isspace(*str)) /* skip whitespace */ | |
301 | str++; | |
302 | ||
303 | if (*str == 0) | |
304 | break; | |
305 | ||
306 | if (*str == '+' || *str == '-') { | |
307 | op = *str++; | |
308 | ||
309 | /* op on first token == relative */ | |
310 | if (!matched) | |
311 | m = *mask; | |
312 | ||
313 | while (isspace(*str)) /* skip whitespace */ | |
314 | str++; | |
315 | ||
316 | if (*str == 0) /* trailing op */ | |
317 | return -EINVAL; | |
318 | } | |
319 | ||
320 | /* find token length */ | |
321 | for (n = 0; str[n] != 0 && !isspace(str[n]); n++); | |
322 | ||
323 | /* match token */ | |
324 | if (spl_debug_token2mask(&t, str, n, is_subsys) != 0) | |
325 | return -EINVAL; | |
326 | ||
327 | matched = 1; | |
328 | if (op == '-') | |
329 | m &= ~t; | |
330 | else | |
331 | m |= t; | |
332 | ||
333 | str += n; | |
334 | } | |
335 | ||
336 | if (!matched) | |
337 | return -EINVAL; | |
338 | ||
339 | *mask = m; | |
340 | return 0; | |
341 | } | |
342 | ||
57d1b188 | 343 | static void |
344 | spl_debug_dumplog_internal(dumplog_priv_t *dp) | |
345 | { | |
346 | void *journal_info; | |
347 | ||
348 | journal_info = current->journal_info; | |
349 | current->journal_info = NULL; | |
350 | ||
351 | snprintf(spl_debug_file_name, sizeof(spl_debug_file_path) - 1, | |
352 | "%s.%ld.%ld", spl_debug_file_path, | |
353 | get_seconds(), (long)dp->dp_pid); | |
627a7497 | 354 | printk("SPL: Dumping log to %s\n", spl_debug_file_name); |
7fea96c0 | 355 | spl_debug_dump_all_pages(dp, spl_debug_file_name); |
57d1b188 | 356 | |
357 | current->journal_info = journal_info; | |
358 | } | |
359 | ||
360 | static int | |
361 | spl_debug_dumplog_thread(void *arg) | |
362 | { | |
363 | dumplog_priv_t *dp = (dumplog_priv_t *)arg; | |
364 | ||
365 | spl_debug_dumplog_internal(dp); | |
7fea96c0 | 366 | atomic_set(&dp->dp_done, 1); |
57d1b188 | 367 | wake_up(&dp->dp_waitq); |
3d061e9d | 368 | complete_and_exit(NULL, 0); |
57d1b188 | 369 | |
370 | return 0; /* Unreachable */ | |
371 | } | |
372 | ||
7fea96c0 | 373 | /* When flag is set do not use a new thread for the debug dump */ |
57d1b188 | 374 | int |
7fea96c0 | 375 | spl_debug_dumplog(int flags) |
57d1b188 | 376 | { |
377 | struct task_struct *tsk; | |
378 | dumplog_priv_t dp; | |
57d1b188 | 379 | |
7fea96c0 | 380 | init_waitqueue_head(&dp.dp_waitq); |
381 | dp.dp_pid = current->pid; | |
382 | dp.dp_flags = flags; | |
383 | atomic_set(&dp.dp_done, 0); | |
57d1b188 | 384 | |
7fea96c0 | 385 | if (dp.dp_flags & DL_NOTHREAD) { |
386 | spl_debug_dumplog_internal(&dp); | |
387 | } else { | |
57d1b188 | 388 | |
7fea96c0 | 389 | tsk = kthread_create(spl_debug_dumplog_thread,(void *)&dp,"spl_debug"); |
390 | if (tsk == NULL) | |
391 | return -ENOMEM; | |
392 | ||
393 | wake_up_process(tsk); | |
394 | wait_event(dp.dp_waitq, atomic_read(&dp.dp_done)); | |
395 | } | |
57d1b188 | 396 | |
a8ac0b89 | 397 | return 0; |
57d1b188 | 398 | } |
399 | EXPORT_SYMBOL(spl_debug_dumplog); | |
400 | ||
401 | static char * | |
402 | trace_get_console_buffer(void) | |
403 | { | |
404 | int cpu = get_cpu(); | |
405 | int idx; | |
406 | ||
407 | if (in_irq()) { | |
408 | idx = 0; | |
409 | } else if (in_softirq()) { | |
410 | idx = 1; | |
411 | } else { | |
412 | idx = 2; | |
413 | } | |
414 | ||
415 | return trace_console_buffers[cpu][idx]; | |
416 | } | |
417 | ||
418 | static void | |
419 | trace_put_console_buffer(char *buffer) | |
420 | { | |
421 | put_cpu(); | |
422 | } | |
423 | ||
f6c81c5e | 424 | static int |
425 | trace_lock_tcd(struct trace_cpu_data *tcd) | |
57d1b188 | 426 | { |
f6c81c5e | 427 | __ASSERT(tcd->tcd_type < TCD_TYPE_MAX); |
57d1b188 | 428 | |
f6c81c5e | 429 | spin_lock_irqsave(&tcd->tcd_lock, tcd->tcd_lock_flags); |
57d1b188 | 430 | |
f6c81c5e | 431 | return 1; |
57d1b188 | 432 | } |
433 | ||
434 | static void | |
f6c81c5e | 435 | trace_unlock_tcd(struct trace_cpu_data *tcd) |
57d1b188 | 436 | { |
f6c81c5e | 437 | __ASSERT(tcd->tcd_type < TCD_TYPE_MAX); |
438 | ||
439 | spin_unlock_irqrestore(&tcd->tcd_lock, tcd->tcd_lock_flags); | |
57d1b188 | 440 | } |
441 | ||
f6c81c5e | 442 | static struct trace_cpu_data * |
443 | trace_get_tcd(void) | |
57d1b188 | 444 | { |
f6c81c5e | 445 | int cpu; |
446 | struct trace_cpu_data *tcd; | |
447 | ||
448 | cpu = get_cpu(); | |
449 | if (in_irq()) | |
450 | tcd = &(*trace_data[TCD_TYPE_IRQ])[cpu].tcd; | |
451 | else if (in_softirq()) | |
452 | tcd = &(*trace_data[TCD_TYPE_SOFTIRQ])[cpu].tcd; | |
453 | else | |
454 | tcd = &(*trace_data[TCD_TYPE_PROC])[cpu].tcd; | |
57d1b188 | 455 | |
f6c81c5e | 456 | trace_lock_tcd(tcd); |
57d1b188 | 457 | |
f6c81c5e | 458 | return tcd; |
57d1b188 | 459 | } |
460 | ||
461 | static void | |
f6c81c5e | 462 | trace_put_tcd (struct trace_cpu_data *tcd) |
57d1b188 | 463 | { |
f6c81c5e | 464 | trace_unlock_tcd(tcd); |
57d1b188 | 465 | |
f6c81c5e | 466 | put_cpu(); |
57d1b188 | 467 | } |
468 | ||
469 | static void | |
470 | trace_set_debug_header(struct spl_debug_header *header, int subsys, | |
471 | int mask, const int line, unsigned long stack) | |
472 | { | |
473 | struct timeval tv; | |
474 | ||
475 | do_gettimeofday(&tv); | |
476 | ||
477 | header->ph_subsys = subsys; | |
478 | header->ph_mask = mask; | |
479 | header->ph_cpu_id = smp_processor_id(); | |
480 | header->ph_sec = (__u32)tv.tv_sec; | |
481 | header->ph_usec = tv.tv_usec; | |
482 | header->ph_stack = stack; | |
483 | header->ph_pid = current->pid; | |
484 | header->ph_line_num = line; | |
485 | ||
486 | return; | |
487 | } | |
488 | ||
489 | static void | |
490 | trace_print_to_console(struct spl_debug_header *hdr, int mask, const char *buf, | |
491 | int len, const char *file, const char *fn) | |
492 | { | |
493 | char *prefix = "SPL", *ptype = NULL; | |
494 | ||
495 | if ((mask & D_EMERG) != 0) { | |
496 | prefix = "SPLError"; | |
497 | ptype = KERN_EMERG; | |
498 | } else if ((mask & D_ERROR) != 0) { | |
499 | prefix = "SPLError"; | |
500 | ptype = KERN_ERR; | |
501 | } else if ((mask & D_WARNING) != 0) { | |
502 | prefix = "SPL"; | |
503 | ptype = KERN_WARNING; | |
504 | } else if ((mask & (D_CONSOLE | spl_debug_printk)) != 0) { | |
505 | prefix = "SPL"; | |
506 | ptype = KERN_INFO; | |
507 | } | |
508 | ||
509 | if ((mask & D_CONSOLE) != 0) { | |
510 | printk("%s%s: %.*s", ptype, prefix, len, buf); | |
511 | } else { | |
892d5106 | 512 | printk("%s%s: %d:%d:(%s:%d:%s()) %.*s", ptype, prefix, |
513 | hdr->ph_pid, hdr->ph_stack, file, | |
514 | hdr->ph_line_num, fn, len, buf); | |
57d1b188 | 515 | } |
516 | ||
517 | return; | |
518 | } | |
519 | ||
520 | static int | |
521 | trace_max_debug_mb(void) | |
522 | { | |
523 | return MAX(512, ((num_physpages >> (20 - PAGE_SHIFT)) * 80) / 100); | |
524 | } | |
525 | ||
57d1b188 | 526 | static struct trace_page * |
527 | tage_alloc(int gfp) | |
528 | { | |
529 | struct page *page; | |
530 | struct trace_page *tage; | |
531 | ||
532 | page = alloc_pages(gfp | __GFP_NOWARN, 0); | |
533 | if (page == NULL) | |
534 | return NULL; | |
535 | ||
536 | tage = kmalloc(sizeof(*tage), gfp); | |
537 | if (tage == NULL) { | |
538 | __free_pages(page, 0); | |
539 | return NULL; | |
540 | } | |
541 | ||
542 | tage->page = page; | |
543 | atomic_inc(&trace_tage_allocated); | |
544 | ||
545 | return tage; | |
546 | } | |
547 | ||
548 | static void | |
549 | tage_free(struct trace_page *tage) | |
550 | { | |
551 | __ASSERT(tage != NULL); | |
552 | __ASSERT(tage->page != NULL); | |
553 | ||
554 | __free_pages(tage->page, 0); | |
555 | kfree(tage); | |
556 | atomic_dec(&trace_tage_allocated); | |
557 | } | |
558 | ||
559 | static struct trace_page * | |
560 | tage_from_list(struct list_head *list) | |
561 | { | |
562 | return list_entry(list, struct trace_page, linkage); | |
563 | } | |
564 | ||
565 | static void | |
566 | tage_to_tail(struct trace_page *tage, struct list_head *queue) | |
567 | { | |
568 | __ASSERT(tage != NULL); | |
569 | __ASSERT(queue != NULL); | |
570 | ||
571 | list_move_tail(&tage->linkage, queue); | |
572 | } | |
573 | ||
574 | /* try to return a page that has 'len' bytes left at the end */ | |
575 | static struct trace_page * | |
576 | trace_get_tage_try(struct trace_cpu_data *tcd, unsigned long len) | |
577 | { | |
578 | struct trace_page *tage; | |
579 | ||
580 | if (tcd->tcd_cur_pages > 0) { | |
581 | __ASSERT(!list_empty(&tcd->tcd_pages)); | |
582 | tage = tage_from_list(tcd->tcd_pages.prev); | |
583 | if (tage->used + len <= PAGE_SIZE) | |
584 | return tage; | |
585 | } | |
586 | ||
587 | if (tcd->tcd_cur_pages < tcd->tcd_max_pages) { | |
588 | if (tcd->tcd_cur_stock_pages > 0) { | |
589 | tage = tage_from_list(tcd->tcd_stock_pages.prev); | |
590 | tcd->tcd_cur_stock_pages--; | |
591 | list_del_init(&tage->linkage); | |
592 | } else { | |
593 | tage = tage_alloc(GFP_ATOMIC); | |
594 | if (tage == NULL) { | |
595 | printk(KERN_WARNING | |
596 | "failure to allocate a tage (%ld)\n", | |
597 | tcd->tcd_cur_pages); | |
598 | return NULL; | |
599 | } | |
600 | } | |
601 | ||
602 | tage->used = 0; | |
603 | tage->cpu = smp_processor_id(); | |
604 | tage->type = tcd->tcd_type; | |
605 | list_add_tail(&tage->linkage, &tcd->tcd_pages); | |
606 | tcd->tcd_cur_pages++; | |
607 | ||
608 | return tage; | |
609 | } | |
610 | ||
611 | return NULL; | |
612 | } | |
613 | ||
614 | /* return a page that has 'len' bytes left at the end */ | |
615 | static struct trace_page * | |
616 | trace_get_tage(struct trace_cpu_data *tcd, unsigned long len) | |
617 | { | |
618 | struct trace_page *tage; | |
619 | ||
620 | __ASSERT(len <= PAGE_SIZE); | |
621 | ||
622 | tage = trace_get_tage_try(tcd, len); | |
623 | if (tage) | |
624 | return tage; | |
625 | ||
626 | if (tcd->tcd_cur_pages > 0) { | |
627 | tage = tage_from_list(tcd->tcd_pages.next); | |
628 | tage->used = 0; | |
629 | tage_to_tail(tage, &tcd->tcd_pages); | |
630 | } | |
631 | ||
632 | return tage; | |
633 | } | |
634 | ||
635 | int | |
636 | spl_debug_vmsg(spl_debug_limit_state_t *cdls, int subsys, int mask, | |
637 | const char *file, const char *fn, const int line, | |
638 | const char *format1, va_list args, const char *format2, ...) | |
639 | { | |
640 | struct trace_cpu_data *tcd = NULL; | |
b02e9b24 | 641 | struct spl_debug_header header = { 0, }; |
57d1b188 | 642 | struct trace_page *tage; |
643 | /* string_buf is used only if tcd != NULL, and is always set then */ | |
644 | char *string_buf = NULL; | |
645 | char *debug_buf; | |
646 | int known_size; | |
647 | int needed = 85; /* average message length */ | |
648 | int max_nob; | |
649 | va_list ap; | |
650 | int i; | |
651 | int remain; | |
652 | ||
653 | if (strchr(file, '/')) | |
654 | file = strrchr(file, '/') + 1; | |
655 | ||
656 | trace_set_debug_header(&header, subsys, mask, line, CDEBUG_STACK()); | |
657 | ||
658 | tcd = trace_get_tcd(); | |
659 | if (tcd == NULL) | |
660 | goto console; | |
661 | ||
662 | if (tcd->tcd_shutting_down) { | |
663 | trace_put_tcd(tcd); | |
664 | tcd = NULL; | |
665 | goto console; | |
666 | } | |
667 | ||
668 | known_size = strlen(file) + 1; | |
669 | if (fn) | |
670 | known_size += strlen(fn) + 1; | |
671 | ||
672 | if (spl_debug_binary) | |
673 | known_size += sizeof(header); | |
674 | ||
675 | /* '2' used because vsnprintf returns real size required for output | |
676 | * _without_ terminating NULL. */ | |
677 | for (i = 0; i < 2; i++) { | |
678 | tage = trace_get_tage(tcd, needed + known_size + 1); | |
679 | if (tage == NULL) { | |
680 | if (needed + known_size > PAGE_SIZE) | |
681 | mask |= D_ERROR; | |
682 | ||
683 | trace_put_tcd(tcd); | |
684 | tcd = NULL; | |
685 | goto console; | |
686 | } | |
687 | ||
688 | string_buf = (char *)page_address(tage->page) + | |
689 | tage->used + known_size; | |
690 | ||
691 | max_nob = PAGE_SIZE - tage->used - known_size; | |
692 | if (max_nob <= 0) { | |
693 | printk(KERN_EMERG "negative max_nob: %i\n", max_nob); | |
694 | mask |= D_ERROR; | |
695 | trace_put_tcd(tcd); | |
696 | tcd = NULL; | |
697 | goto console; | |
698 | } | |
699 | ||
700 | needed = 0; | |
701 | if (format1) { | |
702 | va_copy(ap, args); | |
703 | needed = vsnprintf(string_buf, max_nob, format1, ap); | |
704 | va_end(ap); | |
705 | } | |
706 | ||
707 | if (format2) { | |
708 | remain = max_nob - needed; | |
709 | if (remain < 0) | |
710 | remain = 0; | |
711 | ||
712 | va_start(ap, format2); | |
713 | needed += vsnprintf(string_buf+needed, remain, format2, ap); | |
714 | va_end(ap); | |
715 | } | |
716 | ||
717 | if (needed < max_nob) | |
718 | break; | |
719 | } | |
720 | ||
57d1b188 | 721 | header.ph_len = known_size + needed; |
722 | debug_buf = (char *)page_address(tage->page) + tage->used; | |
723 | ||
724 | if (spl_debug_binary) { | |
725 | memcpy(debug_buf, &header, sizeof(header)); | |
726 | tage->used += sizeof(header); | |
727 | debug_buf += sizeof(header); | |
728 | } | |
729 | ||
730 | strcpy(debug_buf, file); | |
731 | tage->used += strlen(file) + 1; | |
732 | debug_buf += strlen(file) + 1; | |
733 | ||
734 | if (fn) { | |
735 | strcpy(debug_buf, fn); | |
736 | tage->used += strlen(fn) + 1; | |
737 | debug_buf += strlen(fn) + 1; | |
738 | } | |
739 | ||
740 | __ASSERT(debug_buf == string_buf); | |
741 | ||
742 | tage->used += needed; | |
743 | __ASSERT (tage->used <= PAGE_SIZE); | |
744 | ||
745 | console: | |
746 | if ((mask & spl_debug_printk) == 0) { | |
747 | /* no console output requested */ | |
748 | if (tcd != NULL) | |
749 | trace_put_tcd(tcd); | |
750 | return 1; | |
751 | } | |
752 | ||
753 | if (cdls != NULL) { | |
754 | if (spl_console_ratelimit && cdls->cdls_next != 0 && | |
755 | !time_before(cdls->cdls_next, jiffies)) { | |
756 | /* skipping a console message */ | |
757 | cdls->cdls_count++; | |
758 | if (tcd != NULL) | |
759 | trace_put_tcd(tcd); | |
760 | return 1; | |
761 | } | |
762 | ||
763 | if (time_before(cdls->cdls_next + spl_console_max_delay + | |
764 | (10 * HZ), jiffies)) { | |
765 | /* last timeout was a long time ago */ | |
766 | cdls->cdls_delay /= spl_console_backoff * 4; | |
767 | } else { | |
768 | cdls->cdls_delay *= spl_console_backoff; | |
769 | ||
770 | if (cdls->cdls_delay < spl_console_min_delay) | |
771 | cdls->cdls_delay = spl_console_min_delay; | |
772 | else if (cdls->cdls_delay > spl_console_max_delay) | |
773 | cdls->cdls_delay = spl_console_max_delay; | |
774 | } | |
775 | ||
776 | /* ensure cdls_next is never zero after it's been seen */ | |
777 | cdls->cdls_next = (jiffies + cdls->cdls_delay) | 1; | |
778 | } | |
779 | ||
780 | if (tcd != NULL) { | |
781 | trace_print_to_console(&header, mask, string_buf, needed, file, fn); | |
782 | trace_put_tcd(tcd); | |
783 | } else { | |
784 | string_buf = trace_get_console_buffer(); | |
785 | ||
786 | needed = 0; | |
787 | if (format1 != NULL) { | |
788 | va_copy(ap, args); | |
789 | needed = vsnprintf(string_buf, TRACE_CONSOLE_BUFFER_SIZE, format1, ap); | |
790 | va_end(ap); | |
791 | } | |
792 | if (format2 != NULL) { | |
793 | remain = TRACE_CONSOLE_BUFFER_SIZE - needed; | |
794 | if (remain > 0) { | |
795 | va_start(ap, format2); | |
796 | needed += vsnprintf(string_buf+needed, remain, format2, ap); | |
797 | va_end(ap); | |
798 | } | |
799 | } | |
800 | trace_print_to_console(&header, mask, | |
801 | string_buf, needed, file, fn); | |
802 | ||
803 | trace_put_console_buffer(string_buf); | |
804 | } | |
805 | ||
806 | if (cdls != NULL && cdls->cdls_count != 0) { | |
807 | string_buf = trace_get_console_buffer(); | |
808 | ||
809 | needed = snprintf(string_buf, TRACE_CONSOLE_BUFFER_SIZE, | |
810 | "Skipped %d previous similar message%s\n", | |
811 | cdls->cdls_count, (cdls->cdls_count > 1) ? "s" : ""); | |
812 | ||
813 | trace_print_to_console(&header, mask, | |
814 | string_buf, needed, file, fn); | |
815 | ||
816 | trace_put_console_buffer(string_buf); | |
817 | cdls->cdls_count = 0; | |
818 | } | |
819 | ||
820 | return 0; | |
821 | } | |
822 | EXPORT_SYMBOL(spl_debug_vmsg); | |
823 | ||
824 | /* Do the collect_pages job on a single CPU: assumes that all other | |
825 | * CPUs have been stopped during a panic. If this isn't true for | |
826 | * some arch, this will have to be implemented separately in each arch. | |
827 | */ | |
828 | static void | |
7fea96c0 | 829 | collect_pages_from_single_cpu(struct page_collection *pc) |
57d1b188 | 830 | { |
831 | struct trace_cpu_data *tcd; | |
832 | int i, j; | |
833 | ||
834 | tcd_for_each(tcd, i, j) { | |
835 | list_splice_init(&tcd->tcd_pages, &pc->pc_pages); | |
836 | tcd->tcd_cur_pages = 0; | |
837 | } | |
838 | } | |
839 | ||
840 | static void | |
f6c81c5e | 841 | collect_pages_on_all_cpus(struct page_collection *pc) |
57d1b188 | 842 | { |
843 | struct trace_cpu_data *tcd; | |
f6c81c5e | 844 | int i, cpu; |
57d1b188 | 845 | |
846 | spin_lock(&pc->pc_lock); | |
f6c81c5e | 847 | for_each_possible_cpu(cpu) { |
848 | tcd_for_each_type_lock(tcd, i, cpu) { | |
849 | list_splice_init(&tcd->tcd_pages, &pc->pc_pages); | |
850 | tcd->tcd_cur_pages = 0; | |
851 | } | |
57d1b188 | 852 | } |
853 | spin_unlock(&pc->pc_lock); | |
854 | } | |
855 | ||
856 | static void | |
7fea96c0 | 857 | collect_pages(dumplog_priv_t *dp, struct page_collection *pc) |
57d1b188 | 858 | { |
859 | INIT_LIST_HEAD(&pc->pc_pages); | |
860 | ||
7fea96c0 | 861 | if (spl_panic_in_progress || dp->dp_flags & DL_SINGLE_CPU) |
862 | collect_pages_from_single_cpu(pc); | |
57d1b188 | 863 | else |
f6c81c5e | 864 | collect_pages_on_all_cpus(pc); |
57d1b188 | 865 | } |
866 | ||
867 | static void | |
f6c81c5e | 868 | put_pages_back_on_all_cpus(struct page_collection *pc) |
57d1b188 | 869 | { |
57d1b188 | 870 | struct trace_cpu_data *tcd; |
871 | struct list_head *cur_head; | |
872 | struct trace_page *tage; | |
873 | struct trace_page *tmp; | |
f6c81c5e | 874 | int i, cpu; |
57d1b188 | 875 | |
876 | spin_lock(&pc->pc_lock); | |
57d1b188 | 877 | |
f6c81c5e | 878 | for_each_possible_cpu(cpu) { |
879 | tcd_for_each_type_lock(tcd, i, cpu) { | |
880 | cur_head = tcd->tcd_pages.next; | |
57d1b188 | 881 | |
f6c81c5e | 882 | list_for_each_entry_safe(tage, tmp, &pc->pc_pages, |
883 | linkage) { | |
57d1b188 | 884 | |
f6c81c5e | 885 | __ASSERT_TAGE_INVARIANT(tage); |
886 | ||
887 | if (tage->cpu != cpu || tage->type != i) | |
888 | continue; | |
57d1b188 | 889 | |
f6c81c5e | 890 | tage_to_tail(tage, cur_head); |
891 | tcd->tcd_cur_pages++; | |
892 | } | |
57d1b188 | 893 | } |
894 | } | |
f6c81c5e | 895 | |
57d1b188 | 896 | spin_unlock(&pc->pc_lock); |
897 | } | |
898 | ||
899 | static void | |
900 | put_pages_back(struct page_collection *pc) | |
901 | { | |
902 | if (!spl_panic_in_progress) | |
f6c81c5e | 903 | put_pages_back_on_all_cpus(pc); |
57d1b188 | 904 | } |
905 | ||
57d1b188 | 906 | static int |
7fea96c0 | 907 | spl_debug_dump_all_pages(dumplog_priv_t *dp, char *filename) |
57d1b188 | 908 | { |
909 | struct page_collection pc; | |
910 | struct file *filp; | |
911 | struct trace_page *tage; | |
912 | struct trace_page *tmp; | |
913 | mm_segment_t oldfs; | |
914 | int rc = 0; | |
915 | ||
916 | down_write(&trace_sem); | |
917 | ||
f0ff89fc | 918 | filp = spl_filp_open(filename, O_CREAT|O_EXCL|O_WRONLY|O_LARGEFILE, |
57d1b188 | 919 | 0600, &rc); |
920 | if (filp == NULL) { | |
921 | if (rc != -EEXIST) | |
922 | printk(KERN_ERR "SPL: Can't open %s for dump: %d\n", | |
923 | filename, rc); | |
924 | goto out; | |
925 | } | |
926 | ||
927 | spin_lock_init(&pc.pc_lock); | |
7fea96c0 | 928 | collect_pages(dp, &pc); |
57d1b188 | 929 | if (list_empty(&pc.pc_pages)) { |
930 | rc = 0; | |
931 | goto close; | |
932 | } | |
933 | ||
934 | oldfs = get_fs(); | |
935 | set_fs(get_ds()); | |
936 | ||
937 | list_for_each_entry_safe(tage, tmp, &pc.pc_pages, linkage) { | |
938 | __ASSERT_TAGE_INVARIANT(tage); | |
939 | ||
f0ff89fc BB |
940 | rc = spl_filp_write(filp, page_address(tage->page), |
941 | tage->used, spl_filp_poff(filp)); | |
57d1b188 | 942 | if (rc != (int)tage->used) { |
943 | printk(KERN_WARNING "SPL: Wanted to write %u " | |
944 | "but wrote %d\n", tage->used, rc); | |
945 | put_pages_back(&pc); | |
946 | __ASSERT(list_empty(&pc.pc_pages)); | |
947 | break; | |
948 | } | |
949 | list_del(&tage->linkage); | |
950 | tage_free(tage); | |
951 | } | |
952 | ||
953 | set_fs(oldfs); | |
954 | ||
f0ff89fc | 955 | rc = spl_filp_fsync(filp, 1); |
57d1b188 | 956 | if (rc) |
957 | printk(KERN_ERR "SPL: Unable to sync: %d\n", rc); | |
958 | close: | |
f0ff89fc | 959 | spl_filp_close(filp); |
57d1b188 | 960 | out: |
961 | up_write(&trace_sem); | |
962 | ||
963 | return rc; | |
964 | } | |
965 | ||
966 | static void | |
967 | spl_debug_flush_pages(void) | |
968 | { | |
7fea96c0 | 969 | dumplog_priv_t dp; |
57d1b188 | 970 | struct page_collection pc; |
971 | struct trace_page *tage; | |
972 | struct trace_page *tmp; | |
973 | ||
974 | spin_lock_init(&pc.pc_lock); | |
7fea96c0 | 975 | init_waitqueue_head(&dp.dp_waitq); |
976 | dp.dp_pid = current->pid; | |
977 | dp.dp_flags = 0; | |
978 | atomic_set(&dp.dp_done, 0); | |
57d1b188 | 979 | |
7fea96c0 | 980 | collect_pages(&dp, &pc); |
57d1b188 | 981 | list_for_each_entry_safe(tage, tmp, &pc.pc_pages, linkage) { |
982 | __ASSERT_TAGE_INVARIANT(tage); | |
983 | list_del(&tage->linkage); | |
984 | tage_free(tage); | |
985 | } | |
986 | } | |
987 | ||
988 | unsigned long | |
989 | spl_debug_set_mask(unsigned long mask) { | |
990 | spl_debug_mask = mask; | |
991 | return 0; | |
992 | } | |
993 | EXPORT_SYMBOL(spl_debug_set_mask); | |
994 | ||
995 | unsigned long | |
996 | spl_debug_get_mask(void) { | |
997 | return spl_debug_mask; | |
998 | } | |
999 | EXPORT_SYMBOL(spl_debug_get_mask); | |
1000 | ||
1001 | unsigned long | |
1002 | spl_debug_set_subsys(unsigned long subsys) { | |
1003 | spl_debug_subsys = subsys; | |
1004 | return 0; | |
1005 | } | |
1006 | EXPORT_SYMBOL(spl_debug_set_subsys); | |
1007 | ||
1008 | unsigned long | |
1009 | spl_debug_get_subsys(void) { | |
1010 | return spl_debug_subsys; | |
1011 | } | |
1012 | EXPORT_SYMBOL(spl_debug_get_subsys); | |
1013 | ||
1014 | int | |
1015 | spl_debug_set_mb(int mb) | |
1016 | { | |
1017 | int i, j, pages; | |
1018 | int limit = trace_max_debug_mb(); | |
1019 | struct trace_cpu_data *tcd; | |
1020 | ||
1021 | if (mb < num_possible_cpus()) { | |
1022 | printk(KERN_ERR "SPL: Refusing to set debug buffer size to " | |
1023 | "%dMB - lower limit is %d\n", mb, num_possible_cpus()); | |
1024 | return -EINVAL; | |
1025 | } | |
1026 | ||
1027 | if (mb > limit) { | |
1028 | printk(KERN_ERR "SPL: Refusing to set debug buffer size to " | |
1029 | "%dMB - upper limit is %d\n", mb, limit); | |
1030 | return -EINVAL; | |
1031 | } | |
1032 | ||
1033 | mb /= num_possible_cpus(); | |
1034 | pages = mb << (20 - PAGE_SHIFT); | |
1035 | ||
1036 | down_write(&trace_sem); | |
1037 | ||
1038 | tcd_for_each(tcd, i, j) | |
1039 | tcd->tcd_max_pages = (pages * tcd->tcd_pages_factor) / 100; | |
1040 | ||
1041 | up_write(&trace_sem); | |
1042 | ||
1043 | return 0; | |
1044 | } | |
1045 | EXPORT_SYMBOL(spl_debug_set_mb); | |
1046 | ||
1047 | int | |
1048 | spl_debug_get_mb(void) | |
1049 | { | |
1050 | int i, j; | |
1051 | struct trace_cpu_data *tcd; | |
1052 | int total_pages = 0; | |
1053 | ||
1054 | down_read(&trace_sem); | |
1055 | ||
1056 | tcd_for_each(tcd, i, j) | |
1057 | total_pages += tcd->tcd_max_pages; | |
1058 | ||
1059 | up_read(&trace_sem); | |
1060 | ||
1061 | return (total_pages >> (20 - PAGE_SHIFT)) + 1; | |
1062 | } | |
1063 | EXPORT_SYMBOL(spl_debug_get_mb); | |
1064 | ||
1065 | void spl_debug_dumpstack(struct task_struct *tsk) | |
1066 | { | |
1067 | extern void show_task(struct task_struct *); | |
1068 | ||
1069 | if (tsk == NULL) | |
1070 | tsk = current; | |
1071 | ||
627a7497 | 1072 | printk("SPL: Showing stack for process %d\n", tsk->pid); |
57d86234 | 1073 | dump_stack(); |
57d1b188 | 1074 | } |
1075 | EXPORT_SYMBOL(spl_debug_dumpstack); | |
1076 | ||
7fea96c0 | 1077 | void spl_debug_bug(char *file, const char *func, const int line, int flags) |
57d1b188 | 1078 | { |
1079 | spl_debug_catastrophe = 1; | |
937879f1 | 1080 | spl_debug_msg(NULL, 0, D_EMERG, file, func, line, "SBUG\n"); |
57d1b188 | 1081 | |
1082 | if (in_interrupt()) { | |
937879f1 | 1083 | panic("SBUG in interrupt.\n"); |
57d1b188 | 1084 | /* not reached */ |
1085 | } | |
1086 | ||
97f8f6d7 BB |
1087 | if (in_atomic() || irqs_disabled()) |
1088 | flags |= DL_NOTHREAD; | |
1089 | ||
57d1b188 | 1090 | /* Ensure all debug pages and dumped by current cpu */ |
1091 | if (spl_debug_panic_on_bug) | |
1092 | spl_panic_in_progress = 1; | |
1093 | ||
1094 | spl_debug_dumpstack(NULL); | |
7fea96c0 | 1095 | spl_debug_dumplog(flags); |
57d1b188 | 1096 | |
1097 | if (spl_debug_panic_on_bug) | |
937879f1 | 1098 | panic("SBUG"); |
57d1b188 | 1099 | |
1100 | set_task_state(current, TASK_UNINTERRUPTIBLE); | |
1101 | while (1) | |
1102 | schedule(); | |
1103 | } | |
1104 | EXPORT_SYMBOL(spl_debug_bug); | |
1105 | ||
1106 | int | |
1107 | spl_debug_clear_buffer(void) | |
1108 | { | |
1109 | spl_debug_flush_pages(); | |
1110 | return 0; | |
1111 | } | |
1112 | EXPORT_SYMBOL(spl_debug_clear_buffer); | |
1113 | ||
1114 | int | |
1115 | spl_debug_mark_buffer(char *text) | |
1116 | { | |
1117 | CDEBUG(D_WARNING, "*************************************\n"); | |
1118 | CDEBUG(D_WARNING, "DEBUG MARKER: %s\n", text); | |
1119 | CDEBUG(D_WARNING, "*************************************\n"); | |
1120 | ||
1121 | return 0; | |
1122 | } | |
1123 | EXPORT_SYMBOL(spl_debug_mark_buffer); | |
1124 | ||
57d1b188 | 1125 | static int |
1126 | trace_init(int max_pages) | |
1127 | { | |
1128 | struct trace_cpu_data *tcd; | |
1129 | int i, j; | |
1130 | ||
1131 | init_rwsem(&trace_sem); | |
1132 | ||
1133 | /* initialize trace_data */ | |
1134 | memset(trace_data, 0, sizeof(trace_data)); | |
1135 | for (i = 0; i < TCD_TYPE_MAX; i++) { | |
1136 | trace_data[i] = kmalloc(sizeof(union trace_data_union) * | |
1137 | NR_CPUS, GFP_KERNEL); | |
1138 | if (trace_data[i] == NULL) | |
1139 | goto out; | |
1140 | } | |
1141 | ||
1142 | tcd_for_each(tcd, i, j) { | |
f6c81c5e | 1143 | spin_lock_init(&tcd->tcd_lock); |
57d1b188 | 1144 | tcd->tcd_pages_factor = pages_factor[i]; |
1145 | tcd->tcd_type = i; | |
1146 | tcd->tcd_cpu = j; | |
1147 | INIT_LIST_HEAD(&tcd->tcd_pages); | |
1148 | INIT_LIST_HEAD(&tcd->tcd_stock_pages); | |
1149 | tcd->tcd_cur_pages = 0; | |
1150 | tcd->tcd_cur_stock_pages = 0; | |
1151 | tcd->tcd_max_pages = (max_pages * pages_factor[i]) / 100; | |
1152 | tcd->tcd_shutting_down = 0; | |
1153 | } | |
1154 | ||
1155 | for (i = 0; i < num_possible_cpus(); i++) { | |
1156 | for (j = 0; j < 3; j++) { | |
1157 | trace_console_buffers[i][j] = | |
1158 | kmalloc(TRACE_CONSOLE_BUFFER_SIZE, | |
1159 | GFP_KERNEL); | |
1160 | ||
1161 | if (trace_console_buffers[i][j] == NULL) | |
1162 | goto out; | |
1163 | } | |
1164 | } | |
1165 | ||
1166 | return 0; | |
1167 | out: | |
1168 | trace_fini(); | |
1169 | printk(KERN_ERR "SPL: Insufficient memory for debug logs\n"); | |
1170 | return -ENOMEM; | |
1171 | } | |
1172 | ||
1173 | int | |
1174 | debug_init(void) | |
1175 | { | |
1176 | int rc, max = spl_debug_mb; | |
1177 | ||
1178 | spl_console_max_delay = SPL_DEFAULT_MAX_DELAY; | |
1179 | spl_console_min_delay = SPL_DEFAULT_MIN_DELAY; | |
1180 | ||
1181 | /* If spl_debug_mb is set to an invalid value or uninitialized | |
1182 | * then just make the total buffers smp_num_cpus TCD_MAX_PAGES */ | |
1183 | if (max > (num_physpages >> (20 - 2 - PAGE_SHIFT)) / 5 || | |
1184 | max >= 512 || max < 0) { | |
1185 | max = TCD_MAX_PAGES; | |
1186 | } else { | |
1187 | max = (max / num_online_cpus()) << (20 - PAGE_SHIFT); | |
1188 | } | |
1189 | ||
1190 | rc = trace_init(max); | |
1191 | if (rc) | |
1192 | return rc; | |
1193 | ||
d50bd9e2 | 1194 | return rc; |
57d1b188 | 1195 | } |
1196 | ||
1197 | static void | |
f6c81c5e | 1198 | trace_cleanup_on_all_cpus(void) |
57d1b188 | 1199 | { |
1200 | struct trace_cpu_data *tcd; | |
1201 | struct trace_page *tage; | |
1202 | struct trace_page *tmp; | |
f6c81c5e | 1203 | int i, cpu; |
57d1b188 | 1204 | |
f6c81c5e | 1205 | for_each_possible_cpu(cpu) { |
1206 | tcd_for_each_type_lock(tcd, i, cpu) { | |
1207 | tcd->tcd_shutting_down = 1; | |
57d1b188 | 1208 | |
f6c81c5e | 1209 | list_for_each_entry_safe(tage, tmp, &tcd->tcd_pages, |
1210 | linkage) { | |
1211 | __ASSERT_TAGE_INVARIANT(tage); | |
57d1b188 | 1212 | |
f6c81c5e | 1213 | list_del(&tage->linkage); |
1214 | tage_free(tage); | |
1215 | } | |
1216 | tcd->tcd_cur_pages = 0; | |
57d1b188 | 1217 | } |
57d1b188 | 1218 | } |
1219 | } | |
1220 | ||
1221 | static void | |
1222 | trace_fini(void) | |
1223 | { | |
1224 | int i, j; | |
1225 | ||
f6c81c5e | 1226 | trace_cleanup_on_all_cpus(); |
57d1b188 | 1227 | |
1228 | for (i = 0; i < num_possible_cpus(); i++) { | |
1229 | for (j = 0; j < 3; j++) { | |
1230 | if (trace_console_buffers[i][j] != NULL) { | |
1231 | kfree(trace_console_buffers[i][j]); | |
1232 | trace_console_buffers[i][j] = NULL; | |
1233 | } | |
1234 | } | |
1235 | } | |
1236 | ||
124ca8a5 | 1237 | for (i = 0; i < TCD_TYPE_MAX && trace_data[i] != NULL; i++) { |
57d1b188 | 1238 | kfree(trace_data[i]); |
1239 | trace_data[i] = NULL; | |
1240 | } | |
1241 | } | |
1242 | ||
1243 | void | |
1244 | debug_fini(void) | |
1245 | { | |
57d1b188 | 1246 | trace_fini(); |
57d1b188 | 1247 | } |