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57d1b188 | 1 | /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*- |
2 | * vim:expandtab:shiftwidth=8:tabstop=8: | |
3 | * | |
4 | * Copyright (C) 2004 Cluster File Systems, Inc. | |
5 | * Author: Zach Brown <zab@clusterfs.com> | |
6 | * Author: Phil Schwan <phil@clusterfs.com> | |
7 | * Author: Brian Behlendorf <behlendorf1@llnl.gov> | |
8 | * | |
9 | * This file was originally part of Lustre, http://www.lustre.org. | |
10 | * but has subsequently been adapted for use in the SPL in | |
11 | * accordance with the GPL. | |
12 | * | |
13 | * SPL is free software; you can redistribute it and/or | |
14 | * modify it under the terms of version 2 of the GNU General Public | |
15 | * License as published by the Free Software Foundation. | |
16 | * | |
17 | * SPL is distributed in the hope that it will be useful, | |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
21 | * | |
22 | * You should have received a copy of the GNU General Public License | |
23 | * along with SPL; if not, write to the Free Software | |
24 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
25 | */ | |
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> | |
36 | #include <sys/sysmacros.h> | |
37 | #include <sys/proc.h> | |
38 | #include <sys/debug.h> | |
39 | #include <spl-ctl.h> | |
40 | #include "config.h" | |
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 | ||
104 | static int panic_notifier(struct notifier_block *, unsigned long, void *); | |
105 | static int spl_debug_dump_all_pages(char *); | |
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 | ||
116 | static struct notifier_block spl_panic_notifier = { | |
117 | notifier_call: panic_notifier, | |
118 | next: NULL, | |
119 | priority: 10000 | |
120 | }; | |
121 | ||
122 | const char * | |
123 | spl_debug_subsys2str(int subsys) | |
124 | { | |
125 | switch (subsys) { | |
126 | default: | |
127 | return NULL; | |
128 | case S_UNDEFINED: | |
129 | return "undefined"; | |
130 | case S_ATOMIC: | |
131 | return "atomic"; | |
132 | case S_KOBJ: | |
133 | return "kobj"; | |
134 | case S_VNODE: | |
135 | return "vnode"; | |
136 | case S_TIME: | |
137 | return "time"; | |
138 | case S_RWLOCK: | |
139 | return "rwlock"; | |
140 | case S_THREAD: | |
141 | return "thread"; | |
142 | case S_CONDVAR: | |
143 | return "condvar"; | |
144 | case S_MUTEX: | |
145 | return "mutex"; | |
146 | case S_RNG: | |
147 | return "rng"; | |
148 | case S_TASKQ: | |
149 | return "taskq"; | |
150 | case S_KMEM: | |
151 | return "kmem"; | |
152 | } | |
153 | } | |
154 | ||
155 | const char * | |
156 | spl_debug_dbg2str(int debug) | |
157 | { | |
158 | switch (debug) { | |
159 | default: | |
160 | return NULL; | |
161 | case D_TRACE: | |
162 | return "trace"; | |
163 | case D_INFO: | |
164 | return "info"; | |
165 | case D_WARNING: | |
166 | return "warning"; | |
167 | case D_ERROR: | |
168 | return "error"; | |
169 | case D_EMERG: | |
170 | return "emerg"; | |
171 | case D_CONSOLE: | |
172 | return "console"; | |
173 | case D_IOCTL: | |
174 | return "ioctl"; | |
175 | case D_DPRINTF: | |
176 | return "dprintf"; | |
177 | case D_OTHER: | |
178 | return "other"; | |
179 | } | |
180 | } | |
181 | ||
182 | int | |
183 | spl_debug_mask2str(char *str, int size, unsigned long mask, int is_subsys) | |
184 | { | |
185 | const char *(*fn)(int bit) = is_subsys ? spl_debug_subsys2str : | |
186 | spl_debug_dbg2str; | |
187 | const char *token; | |
188 | int i, bit, len = 0; | |
189 | ||
190 | if (mask == 0) { /* "0" */ | |
191 | if (size > 0) | |
192 | str[0] = '0'; | |
193 | len = 1; | |
194 | } else { /* space-separated tokens */ | |
195 | for (i = 0; i < 32; i++) { | |
196 | bit = 1 << i; | |
197 | ||
198 | if ((mask & bit) == 0) | |
199 | continue; | |
200 | ||
201 | token = fn(bit); | |
202 | if (token == NULL) /* unused bit */ | |
203 | continue; | |
204 | ||
205 | if (len > 0) { /* separator? */ | |
206 | if (len < size) | |
207 | str[len] = ' '; | |
208 | len++; | |
209 | } | |
210 | ||
211 | while (*token != 0) { | |
212 | if (len < size) | |
213 | str[len] = *token; | |
214 | token++; | |
215 | len++; | |
216 | } | |
217 | } | |
218 | } | |
219 | ||
220 | /* terminate 'str' */ | |
221 | if (len < size) | |
222 | str[len] = 0; | |
223 | else | |
224 | str[size - 1] = 0; | |
225 | ||
226 | return len; | |
227 | } | |
228 | ||
229 | static int | |
230 | spl_debug_token2mask(int *mask, const char *str, int len, int is_subsys) | |
231 | { | |
232 | const char *(*fn)(int bit) = is_subsys ? spl_debug_subsys2str : | |
233 | spl_debug_dbg2str; | |
234 | const char *token; | |
235 | int i, j, bit; | |
236 | ||
237 | /* match against known tokens */ | |
238 | for (i = 0; i < 32; i++) { | |
239 | bit = 1 << i; | |
240 | ||
241 | token = fn(bit); | |
242 | if (token == NULL) /* unused? */ | |
243 | continue; | |
244 | ||
245 | /* strcasecmp */ | |
246 | for (j = 0; ; j++) { | |
247 | if (j == len) { /* end of token */ | |
248 | if (token[j] == 0) { | |
249 | *mask = bit; | |
250 | return 0; | |
251 | } | |
252 | break; | |
253 | } | |
254 | ||
255 | if (token[j] == 0) | |
256 | break; | |
257 | ||
258 | if (str[j] == token[j]) | |
259 | continue; | |
260 | ||
261 | if (str[j] < 'A' || 'Z' < str[j]) | |
262 | break; | |
263 | ||
264 | if (str[j] - 'A' + 'a' != token[j]) | |
265 | break; | |
266 | } | |
267 | } | |
268 | ||
269 | return -EINVAL; /* no match */ | |
270 | } | |
271 | ||
272 | int | |
273 | spl_debug_str2mask(unsigned long *mask, const char *str, int is_subsys) | |
274 | { | |
275 | char op = 0; | |
276 | int m = 0, matched, n, t; | |
277 | ||
278 | /* Allow a number for backwards compatibility */ | |
279 | for (n = strlen(str); n > 0; n--) | |
280 | if (!isspace(str[n-1])) | |
281 | break; | |
282 | matched = n; | |
283 | ||
284 | if ((t = sscanf(str, "%i%n", &m, &matched)) >= 1 && matched == n) { | |
285 | *mask = m; | |
286 | return 0; | |
287 | } | |
288 | ||
289 | /* <str> must be a list of debug tokens or numbers separated by | |
290 | * whitespace and optionally an operator ('+' or '-'). If an operator | |
291 | * appears first in <str>, '*mask' is used as the starting point | |
292 | * (relative), otherwise 0 is used (absolute). An operator applies to | |
293 | * all following tokens up to the next operator. */ | |
294 | matched = 0; | |
295 | while (*str != 0) { | |
296 | while (isspace(*str)) /* skip whitespace */ | |
297 | str++; | |
298 | ||
299 | if (*str == 0) | |
300 | break; | |
301 | ||
302 | if (*str == '+' || *str == '-') { | |
303 | op = *str++; | |
304 | ||
305 | /* op on first token == relative */ | |
306 | if (!matched) | |
307 | m = *mask; | |
308 | ||
309 | while (isspace(*str)) /* skip whitespace */ | |
310 | str++; | |
311 | ||
312 | if (*str == 0) /* trailing op */ | |
313 | return -EINVAL; | |
314 | } | |
315 | ||
316 | /* find token length */ | |
317 | for (n = 0; str[n] != 0 && !isspace(str[n]); n++); | |
318 | ||
319 | /* match token */ | |
320 | if (spl_debug_token2mask(&t, str, n, is_subsys) != 0) | |
321 | return -EINVAL; | |
322 | ||
323 | matched = 1; | |
324 | if (op == '-') | |
325 | m &= ~t; | |
326 | else | |
327 | m |= t; | |
328 | ||
329 | str += n; | |
330 | } | |
331 | ||
332 | if (!matched) | |
333 | return -EINVAL; | |
334 | ||
335 | *mask = m; | |
336 | return 0; | |
337 | } | |
338 | ||
339 | typedef struct dumplog_priv { | |
340 | wait_queue_head_t dp_waitq; | |
341 | pid_t dp_pid; | |
342 | atomic_t dp_flag; | |
343 | } dumplog_priv_t; | |
344 | ||
345 | static void | |
346 | spl_debug_dumplog_internal(dumplog_priv_t *dp) | |
347 | { | |
348 | void *journal_info; | |
349 | ||
350 | journal_info = current->journal_info; | |
351 | current->journal_info = NULL; | |
352 | ||
353 | snprintf(spl_debug_file_name, sizeof(spl_debug_file_path) - 1, | |
354 | "%s.%ld.%ld", spl_debug_file_path, | |
355 | get_seconds(), (long)dp->dp_pid); | |
356 | printk(KERN_ALERT "SPL: dumping log to %s\n", spl_debug_file_name); | |
357 | spl_debug_dump_all_pages(spl_debug_file_name); | |
358 | ||
359 | current->journal_info = journal_info; | |
360 | } | |
361 | ||
362 | static int | |
363 | spl_debug_dumplog_thread(void *arg) | |
364 | { | |
365 | dumplog_priv_t *dp = (dumplog_priv_t *)arg; | |
366 | ||
367 | spl_debug_dumplog_internal(dp); | |
368 | atomic_set(&dp->dp_flag, 1); | |
369 | wake_up(&dp->dp_waitq); | |
370 | do_exit(0); | |
371 | ||
372 | return 0; /* Unreachable */ | |
373 | } | |
374 | ||
375 | int | |
376 | spl_debug_dumplog(void) | |
377 | { | |
378 | struct task_struct *tsk; | |
379 | dumplog_priv_t dp; | |
57d1b188 | 380 | |
381 | init_waitqueue_head(&dp.dp_waitq); | |
382 | dp.dp_pid = current->pid; | |
383 | atomic_set(&dp.dp_flag, 0); | |
384 | ||
385 | tsk = kthread_create(spl_debug_dumplog_thread,(void *)&dp,"spl_debug"); | |
386 | if (tsk == NULL) | |
a8ac0b89 | 387 | return -ENOMEM; |
57d1b188 | 388 | |
389 | wake_up_process(tsk); | |
390 | wait_event(dp.dp_waitq, atomic_read(&dp.dp_flag)); | |
391 | ||
a8ac0b89 | 392 | return 0; |
57d1b188 | 393 | } |
394 | EXPORT_SYMBOL(spl_debug_dumplog); | |
395 | ||
396 | static char * | |
397 | trace_get_console_buffer(void) | |
398 | { | |
399 | int cpu = get_cpu(); | |
400 | int idx; | |
401 | ||
402 | if (in_irq()) { | |
403 | idx = 0; | |
404 | } else if (in_softirq()) { | |
405 | idx = 1; | |
406 | } else { | |
407 | idx = 2; | |
408 | } | |
409 | ||
410 | return trace_console_buffers[cpu][idx]; | |
411 | } | |
412 | ||
413 | static void | |
414 | trace_put_console_buffer(char *buffer) | |
415 | { | |
416 | put_cpu(); | |
417 | } | |
418 | ||
419 | static struct trace_cpu_data * | |
420 | trace_get_tcd(void) | |
421 | { | |
422 | int cpu; | |
423 | ||
424 | cpu = get_cpu(); | |
425 | if (in_irq()) | |
426 | return &(*trace_data[TCD_TYPE_IRQ])[cpu].tcd; | |
427 | else if (in_softirq()) | |
428 | return &(*trace_data[TCD_TYPE_SOFTIRQ])[cpu].tcd; | |
429 | ||
430 | return &(*trace_data[TCD_TYPE_PROC])[cpu].tcd; | |
431 | } | |
432 | ||
433 | static void | |
434 | trace_put_tcd (struct trace_cpu_data *tcd) | |
435 | { | |
436 | put_cpu(); | |
437 | } | |
438 | ||
439 | static int | |
440 | trace_lock_tcd(struct trace_cpu_data *tcd) | |
441 | { | |
442 | __ASSERT(tcd->tcd_type < TCD_TYPE_MAX); | |
443 | ||
444 | if (tcd->tcd_type == TCD_TYPE_IRQ) | |
445 | local_irq_disable(); | |
446 | else if (tcd->tcd_type == TCD_TYPE_SOFTIRQ) | |
447 | local_bh_disable(); | |
448 | ||
449 | return 1; | |
450 | } | |
451 | ||
452 | static void | |
453 | trace_unlock_tcd(struct trace_cpu_data *tcd) | |
454 | { | |
455 | __ASSERT(tcd->tcd_type < TCD_TYPE_MAX); | |
456 | ||
457 | if (tcd->tcd_type == TCD_TYPE_IRQ) | |
458 | local_irq_enable(); | |
459 | else if (tcd->tcd_type == TCD_TYPE_SOFTIRQ) | |
460 | local_bh_enable(); | |
461 | } | |
462 | ||
463 | static void | |
464 | trace_set_debug_header(struct spl_debug_header *header, int subsys, | |
465 | int mask, const int line, unsigned long stack) | |
466 | { | |
467 | struct timeval tv; | |
468 | ||
469 | do_gettimeofday(&tv); | |
470 | ||
471 | header->ph_subsys = subsys; | |
472 | header->ph_mask = mask; | |
473 | header->ph_cpu_id = smp_processor_id(); | |
474 | header->ph_sec = (__u32)tv.tv_sec; | |
475 | header->ph_usec = tv.tv_usec; | |
476 | header->ph_stack = stack; | |
477 | header->ph_pid = current->pid; | |
478 | header->ph_line_num = line; | |
479 | ||
480 | return; | |
481 | } | |
482 | ||
483 | static void | |
484 | trace_print_to_console(struct spl_debug_header *hdr, int mask, const char *buf, | |
485 | int len, const char *file, const char *fn) | |
486 | { | |
487 | char *prefix = "SPL", *ptype = NULL; | |
488 | ||
489 | if ((mask & D_EMERG) != 0) { | |
490 | prefix = "SPLError"; | |
491 | ptype = KERN_EMERG; | |
492 | } else if ((mask & D_ERROR) != 0) { | |
493 | prefix = "SPLError"; | |
494 | ptype = KERN_ERR; | |
495 | } else if ((mask & D_WARNING) != 0) { | |
496 | prefix = "SPL"; | |
497 | ptype = KERN_WARNING; | |
498 | } else if ((mask & (D_CONSOLE | spl_debug_printk)) != 0) { | |
499 | prefix = "SPL"; | |
500 | ptype = KERN_INFO; | |
501 | } | |
502 | ||
503 | if ((mask & D_CONSOLE) != 0) { | |
504 | printk("%s%s: %.*s", ptype, prefix, len, buf); | |
505 | } else { | |
892d5106 | 506 | printk("%s%s: %d:%d:(%s:%d:%s()) %.*s", ptype, prefix, |
507 | hdr->ph_pid, hdr->ph_stack, file, | |
508 | hdr->ph_line_num, fn, len, buf); | |
57d1b188 | 509 | } |
510 | ||
511 | return; | |
512 | } | |
513 | ||
514 | static int | |
515 | trace_max_debug_mb(void) | |
516 | { | |
517 | return MAX(512, ((num_physpages >> (20 - PAGE_SHIFT)) * 80) / 100); | |
518 | } | |
519 | ||
520 | static void | |
521 | trace_call_on_all_cpus(void (*fn)(void *arg), void *arg) | |
522 | { | |
523 | cpumask_t mask, cpus_allowed = current->cpus_allowed; | |
524 | int cpu; | |
525 | ||
526 | for_each_online_cpu(cpu) { | |
527 | cpus_clear(mask); | |
528 | cpu_set(cpu, mask); | |
529 | set_cpus_allowed(current, mask); | |
530 | ||
531 | fn(arg); | |
532 | ||
533 | set_cpus_allowed(current, cpus_allowed); | |
534 | } | |
535 | } | |
536 | ||
537 | static struct trace_page * | |
538 | tage_alloc(int gfp) | |
539 | { | |
540 | struct page *page; | |
541 | struct trace_page *tage; | |
542 | ||
543 | page = alloc_pages(gfp | __GFP_NOWARN, 0); | |
544 | if (page == NULL) | |
545 | return NULL; | |
546 | ||
547 | tage = kmalloc(sizeof(*tage), gfp); | |
548 | if (tage == NULL) { | |
549 | __free_pages(page, 0); | |
550 | return NULL; | |
551 | } | |
552 | ||
553 | tage->page = page; | |
554 | atomic_inc(&trace_tage_allocated); | |
555 | ||
556 | return tage; | |
557 | } | |
558 | ||
559 | static void | |
560 | tage_free(struct trace_page *tage) | |
561 | { | |
562 | __ASSERT(tage != NULL); | |
563 | __ASSERT(tage->page != NULL); | |
564 | ||
565 | __free_pages(tage->page, 0); | |
566 | kfree(tage); | |
567 | atomic_dec(&trace_tage_allocated); | |
568 | } | |
569 | ||
570 | static struct trace_page * | |
571 | tage_from_list(struct list_head *list) | |
572 | { | |
573 | return list_entry(list, struct trace_page, linkage); | |
574 | } | |
575 | ||
576 | static void | |
577 | tage_to_tail(struct trace_page *tage, struct list_head *queue) | |
578 | { | |
579 | __ASSERT(tage != NULL); | |
580 | __ASSERT(queue != NULL); | |
581 | ||
582 | list_move_tail(&tage->linkage, queue); | |
583 | } | |
584 | ||
585 | /* try to return a page that has 'len' bytes left at the end */ | |
586 | static struct trace_page * | |
587 | trace_get_tage_try(struct trace_cpu_data *tcd, unsigned long len) | |
588 | { | |
589 | struct trace_page *tage; | |
590 | ||
591 | if (tcd->tcd_cur_pages > 0) { | |
592 | __ASSERT(!list_empty(&tcd->tcd_pages)); | |
593 | tage = tage_from_list(tcd->tcd_pages.prev); | |
594 | if (tage->used + len <= PAGE_SIZE) | |
595 | return tage; | |
596 | } | |
597 | ||
598 | if (tcd->tcd_cur_pages < tcd->tcd_max_pages) { | |
599 | if (tcd->tcd_cur_stock_pages > 0) { | |
600 | tage = tage_from_list(tcd->tcd_stock_pages.prev); | |
601 | tcd->tcd_cur_stock_pages--; | |
602 | list_del_init(&tage->linkage); | |
603 | } else { | |
604 | tage = tage_alloc(GFP_ATOMIC); | |
605 | if (tage == NULL) { | |
606 | printk(KERN_WARNING | |
607 | "failure to allocate a tage (%ld)\n", | |
608 | tcd->tcd_cur_pages); | |
609 | return NULL; | |
610 | } | |
611 | } | |
612 | ||
613 | tage->used = 0; | |
614 | tage->cpu = smp_processor_id(); | |
615 | tage->type = tcd->tcd_type; | |
616 | list_add_tail(&tage->linkage, &tcd->tcd_pages); | |
617 | tcd->tcd_cur_pages++; | |
618 | ||
619 | return tage; | |
620 | } | |
621 | ||
622 | return NULL; | |
623 | } | |
624 | ||
625 | /* return a page that has 'len' bytes left at the end */ | |
626 | static struct trace_page * | |
627 | trace_get_tage(struct trace_cpu_data *tcd, unsigned long len) | |
628 | { | |
629 | struct trace_page *tage; | |
630 | ||
631 | __ASSERT(len <= PAGE_SIZE); | |
632 | ||
633 | tage = trace_get_tage_try(tcd, len); | |
634 | if (tage) | |
635 | return tage; | |
636 | ||
637 | if (tcd->tcd_cur_pages > 0) { | |
638 | tage = tage_from_list(tcd->tcd_pages.next); | |
639 | tage->used = 0; | |
640 | tage_to_tail(tage, &tcd->tcd_pages); | |
641 | } | |
642 | ||
643 | return tage; | |
644 | } | |
645 | ||
646 | int | |
647 | spl_debug_vmsg(spl_debug_limit_state_t *cdls, int subsys, int mask, | |
648 | const char *file, const char *fn, const int line, | |
649 | const char *format1, va_list args, const char *format2, ...) | |
650 | { | |
651 | struct trace_cpu_data *tcd = NULL; | |
652 | struct spl_debug_header header; | |
653 | struct trace_page *tage; | |
654 | /* string_buf is used only if tcd != NULL, and is always set then */ | |
655 | char *string_buf = NULL; | |
656 | char *debug_buf; | |
657 | int known_size; | |
658 | int needed = 85; /* average message length */ | |
659 | int max_nob; | |
660 | va_list ap; | |
661 | int i; | |
662 | int remain; | |
663 | ||
664 | if (strchr(file, '/')) | |
665 | file = strrchr(file, '/') + 1; | |
666 | ||
667 | trace_set_debug_header(&header, subsys, mask, line, CDEBUG_STACK()); | |
668 | ||
669 | tcd = trace_get_tcd(); | |
670 | if (tcd == NULL) | |
671 | goto console; | |
672 | ||
673 | if (tcd->tcd_shutting_down) { | |
674 | trace_put_tcd(tcd); | |
675 | tcd = NULL; | |
676 | goto console; | |
677 | } | |
678 | ||
679 | known_size = strlen(file) + 1; | |
680 | if (fn) | |
681 | known_size += strlen(fn) + 1; | |
682 | ||
683 | if (spl_debug_binary) | |
684 | known_size += sizeof(header); | |
685 | ||
686 | /* '2' used because vsnprintf returns real size required for output | |
687 | * _without_ terminating NULL. */ | |
688 | for (i = 0; i < 2; i++) { | |
689 | tage = trace_get_tage(tcd, needed + known_size + 1); | |
690 | if (tage == NULL) { | |
691 | if (needed + known_size > PAGE_SIZE) | |
692 | mask |= D_ERROR; | |
693 | ||
694 | trace_put_tcd(tcd); | |
695 | tcd = NULL; | |
696 | goto console; | |
697 | } | |
698 | ||
699 | string_buf = (char *)page_address(tage->page) + | |
700 | tage->used + known_size; | |
701 | ||
702 | max_nob = PAGE_SIZE - tage->used - known_size; | |
703 | if (max_nob <= 0) { | |
704 | printk(KERN_EMERG "negative max_nob: %i\n", max_nob); | |
705 | mask |= D_ERROR; | |
706 | trace_put_tcd(tcd); | |
707 | tcd = NULL; | |
708 | goto console; | |
709 | } | |
710 | ||
711 | needed = 0; | |
712 | if (format1) { | |
713 | va_copy(ap, args); | |
714 | needed = vsnprintf(string_buf, max_nob, format1, ap); | |
715 | va_end(ap); | |
716 | } | |
717 | ||
718 | if (format2) { | |
719 | remain = max_nob - needed; | |
720 | if (remain < 0) | |
721 | remain = 0; | |
722 | ||
723 | va_start(ap, format2); | |
724 | needed += vsnprintf(string_buf+needed, remain, format2, ap); | |
725 | va_end(ap); | |
726 | } | |
727 | ||
728 | if (needed < max_nob) | |
729 | break; | |
730 | } | |
731 | ||
732 | if (unlikely(*(string_buf + needed - 1) != '\n')) | |
733 | printk(KERN_INFO "format at %s:%d:%s doesn't end in newline\n", | |
734 | file, line, fn); | |
735 | ||
736 | header.ph_len = known_size + needed; | |
737 | debug_buf = (char *)page_address(tage->page) + tage->used; | |
738 | ||
739 | if (spl_debug_binary) { | |
740 | memcpy(debug_buf, &header, sizeof(header)); | |
741 | tage->used += sizeof(header); | |
742 | debug_buf += sizeof(header); | |
743 | } | |
744 | ||
745 | strcpy(debug_buf, file); | |
746 | tage->used += strlen(file) + 1; | |
747 | debug_buf += strlen(file) + 1; | |
748 | ||
749 | if (fn) { | |
750 | strcpy(debug_buf, fn); | |
751 | tage->used += strlen(fn) + 1; | |
752 | debug_buf += strlen(fn) + 1; | |
753 | } | |
754 | ||
755 | __ASSERT(debug_buf == string_buf); | |
756 | ||
757 | tage->used += needed; | |
758 | __ASSERT (tage->used <= PAGE_SIZE); | |
759 | ||
760 | console: | |
761 | if ((mask & spl_debug_printk) == 0) { | |
762 | /* no console output requested */ | |
763 | if (tcd != NULL) | |
764 | trace_put_tcd(tcd); | |
765 | return 1; | |
766 | } | |
767 | ||
768 | if (cdls != NULL) { | |
769 | if (spl_console_ratelimit && cdls->cdls_next != 0 && | |
770 | !time_before(cdls->cdls_next, jiffies)) { | |
771 | /* skipping a console message */ | |
772 | cdls->cdls_count++; | |
773 | if (tcd != NULL) | |
774 | trace_put_tcd(tcd); | |
775 | return 1; | |
776 | } | |
777 | ||
778 | if (time_before(cdls->cdls_next + spl_console_max_delay + | |
779 | (10 * HZ), jiffies)) { | |
780 | /* last timeout was a long time ago */ | |
781 | cdls->cdls_delay /= spl_console_backoff * 4; | |
782 | } else { | |
783 | cdls->cdls_delay *= spl_console_backoff; | |
784 | ||
785 | if (cdls->cdls_delay < spl_console_min_delay) | |
786 | cdls->cdls_delay = spl_console_min_delay; | |
787 | else if (cdls->cdls_delay > spl_console_max_delay) | |
788 | cdls->cdls_delay = spl_console_max_delay; | |
789 | } | |
790 | ||
791 | /* ensure cdls_next is never zero after it's been seen */ | |
792 | cdls->cdls_next = (jiffies + cdls->cdls_delay) | 1; | |
793 | } | |
794 | ||
795 | if (tcd != NULL) { | |
796 | trace_print_to_console(&header, mask, string_buf, needed, file, fn); | |
797 | trace_put_tcd(tcd); | |
798 | } else { | |
799 | string_buf = trace_get_console_buffer(); | |
800 | ||
801 | needed = 0; | |
802 | if (format1 != NULL) { | |
803 | va_copy(ap, args); | |
804 | needed = vsnprintf(string_buf, TRACE_CONSOLE_BUFFER_SIZE, format1, ap); | |
805 | va_end(ap); | |
806 | } | |
807 | if (format2 != NULL) { | |
808 | remain = TRACE_CONSOLE_BUFFER_SIZE - needed; | |
809 | if (remain > 0) { | |
810 | va_start(ap, format2); | |
811 | needed += vsnprintf(string_buf+needed, remain, format2, ap); | |
812 | va_end(ap); | |
813 | } | |
814 | } | |
815 | trace_print_to_console(&header, mask, | |
816 | string_buf, needed, file, fn); | |
817 | ||
818 | trace_put_console_buffer(string_buf); | |
819 | } | |
820 | ||
821 | if (cdls != NULL && cdls->cdls_count != 0) { | |
822 | string_buf = trace_get_console_buffer(); | |
823 | ||
824 | needed = snprintf(string_buf, TRACE_CONSOLE_BUFFER_SIZE, | |
825 | "Skipped %d previous similar message%s\n", | |
826 | cdls->cdls_count, (cdls->cdls_count > 1) ? "s" : ""); | |
827 | ||
828 | trace_print_to_console(&header, mask, | |
829 | string_buf, needed, file, fn); | |
830 | ||
831 | trace_put_console_buffer(string_buf); | |
832 | cdls->cdls_count = 0; | |
833 | } | |
834 | ||
835 | return 0; | |
836 | } | |
837 | EXPORT_SYMBOL(spl_debug_vmsg); | |
838 | ||
839 | /* Do the collect_pages job on a single CPU: assumes that all other | |
840 | * CPUs have been stopped during a panic. If this isn't true for | |
841 | * some arch, this will have to be implemented separately in each arch. | |
842 | */ | |
843 | static void | |
844 | panic_collect_pages(struct page_collection *pc) | |
845 | { | |
846 | struct trace_cpu_data *tcd; | |
847 | int i, j; | |
848 | ||
849 | tcd_for_each(tcd, i, j) { | |
850 | list_splice_init(&tcd->tcd_pages, &pc->pc_pages); | |
851 | tcd->tcd_cur_pages = 0; | |
852 | } | |
853 | } | |
854 | ||
855 | static void | |
856 | collect_pages_on_cpu(void *info) | |
857 | { | |
858 | struct trace_cpu_data *tcd; | |
859 | struct page_collection *pc = info; | |
860 | int i; | |
861 | ||
862 | spin_lock(&pc->pc_lock); | |
863 | tcd_for_each_type_lock(tcd, i) { | |
864 | list_splice_init(&tcd->tcd_pages, &pc->pc_pages); | |
865 | tcd->tcd_cur_pages = 0; | |
866 | } | |
867 | spin_unlock(&pc->pc_lock); | |
868 | } | |
869 | ||
870 | static void | |
871 | collect_pages(struct page_collection *pc) | |
872 | { | |
873 | INIT_LIST_HEAD(&pc->pc_pages); | |
874 | ||
875 | if (spl_panic_in_progress) | |
876 | panic_collect_pages(pc); | |
877 | else | |
878 | trace_call_on_all_cpus(collect_pages_on_cpu, pc); | |
879 | } | |
880 | ||
881 | static void | |
882 | put_pages_back_on_cpu(void *info) | |
883 | { | |
884 | struct page_collection *pc = info; | |
885 | struct trace_cpu_data *tcd; | |
886 | struct list_head *cur_head; | |
887 | struct trace_page *tage; | |
888 | struct trace_page *tmp; | |
889 | int i; | |
890 | ||
891 | spin_lock(&pc->pc_lock); | |
892 | tcd_for_each_type_lock(tcd, i) { | |
893 | cur_head = tcd->tcd_pages.next; | |
894 | ||
895 | list_for_each_entry_safe(tage, tmp, &pc->pc_pages, linkage) { | |
896 | ||
897 | __ASSERT_TAGE_INVARIANT(tage); | |
898 | ||
899 | if (tage->cpu != smp_processor_id() || tage->type != i) | |
900 | continue; | |
901 | ||
902 | tage_to_tail(tage, cur_head); | |
903 | tcd->tcd_cur_pages++; | |
904 | } | |
905 | } | |
906 | spin_unlock(&pc->pc_lock); | |
907 | } | |
908 | ||
909 | static void | |
910 | put_pages_back(struct page_collection *pc) | |
911 | { | |
912 | if (!spl_panic_in_progress) | |
913 | trace_call_on_all_cpus(put_pages_back_on_cpu, pc); | |
914 | } | |
915 | ||
916 | static struct file * | |
917 | trace_filp_open (const char *name, int flags, int mode, int *err) | |
918 | { | |
919 | struct file *filp = NULL; | |
920 | int rc; | |
921 | ||
922 | filp = filp_open(name, flags, mode); | |
923 | if (IS_ERR(filp)) { | |
924 | rc = PTR_ERR(filp); | |
925 | printk(KERN_ERR "SPL: Can't open %s file: %d\n", name, rc); | |
926 | if (err) | |
927 | *err = rc; | |
928 | filp = NULL; | |
929 | } | |
930 | return filp; | |
931 | } | |
932 | ||
933 | #define trace_filp_write(fp, b, s, p) (fp)->f_op->write((fp), (b), (s), p) | |
934 | #define trace_filp_fsync(fp) (fp)->f_op->fsync((fp),(fp)->f_dentry,1) | |
935 | #define trace_filp_close(f) filp_close(f, NULL) | |
936 | #define trace_filp_poff(f) (&(f)->f_pos) | |
937 | ||
938 | static int | |
939 | spl_debug_dump_all_pages(char *filename) | |
940 | { | |
941 | struct page_collection pc; | |
942 | struct file *filp; | |
943 | struct trace_page *tage; | |
944 | struct trace_page *tmp; | |
945 | mm_segment_t oldfs; | |
946 | int rc = 0; | |
947 | ||
948 | down_write(&trace_sem); | |
949 | ||
950 | filp = trace_filp_open(filename, O_CREAT|O_EXCL|O_WRONLY|O_LARGEFILE, | |
951 | 0600, &rc); | |
952 | if (filp == NULL) { | |
953 | if (rc != -EEXIST) | |
954 | printk(KERN_ERR "SPL: Can't open %s for dump: %d\n", | |
955 | filename, rc); | |
956 | goto out; | |
957 | } | |
958 | ||
959 | spin_lock_init(&pc.pc_lock); | |
960 | collect_pages(&pc); | |
961 | if (list_empty(&pc.pc_pages)) { | |
962 | rc = 0; | |
963 | goto close; | |
964 | } | |
965 | ||
966 | oldfs = get_fs(); | |
967 | set_fs(get_ds()); | |
968 | ||
969 | list_for_each_entry_safe(tage, tmp, &pc.pc_pages, linkage) { | |
970 | __ASSERT_TAGE_INVARIANT(tage); | |
971 | ||
972 | rc = trace_filp_write(filp, page_address(tage->page), | |
973 | tage->used, trace_filp_poff(filp)); | |
974 | if (rc != (int)tage->used) { | |
975 | printk(KERN_WARNING "SPL: Wanted to write %u " | |
976 | "but wrote %d\n", tage->used, rc); | |
977 | put_pages_back(&pc); | |
978 | __ASSERT(list_empty(&pc.pc_pages)); | |
979 | break; | |
980 | } | |
981 | list_del(&tage->linkage); | |
982 | tage_free(tage); | |
983 | } | |
984 | ||
985 | set_fs(oldfs); | |
986 | ||
987 | rc = trace_filp_fsync(filp); | |
988 | if (rc) | |
989 | printk(KERN_ERR "SPL: Unable to sync: %d\n", rc); | |
990 | close: | |
991 | trace_filp_close(filp); | |
992 | out: | |
993 | up_write(&trace_sem); | |
994 | ||
995 | return rc; | |
996 | } | |
997 | ||
998 | static void | |
999 | spl_debug_flush_pages(void) | |
1000 | { | |
1001 | struct page_collection pc; | |
1002 | struct trace_page *tage; | |
1003 | struct trace_page *tmp; | |
1004 | ||
1005 | spin_lock_init(&pc.pc_lock); | |
1006 | ||
1007 | collect_pages(&pc); | |
1008 | list_for_each_entry_safe(tage, tmp, &pc.pc_pages, linkage) { | |
1009 | __ASSERT_TAGE_INVARIANT(tage); | |
1010 | list_del(&tage->linkage); | |
1011 | tage_free(tage); | |
1012 | } | |
1013 | } | |
1014 | ||
1015 | unsigned long | |
1016 | spl_debug_set_mask(unsigned long mask) { | |
1017 | spl_debug_mask = mask; | |
1018 | return 0; | |
1019 | } | |
1020 | EXPORT_SYMBOL(spl_debug_set_mask); | |
1021 | ||
1022 | unsigned long | |
1023 | spl_debug_get_mask(void) { | |
1024 | return spl_debug_mask; | |
1025 | } | |
1026 | EXPORT_SYMBOL(spl_debug_get_mask); | |
1027 | ||
1028 | unsigned long | |
1029 | spl_debug_set_subsys(unsigned long subsys) { | |
1030 | spl_debug_subsys = subsys; | |
1031 | return 0; | |
1032 | } | |
1033 | EXPORT_SYMBOL(spl_debug_set_subsys); | |
1034 | ||
1035 | unsigned long | |
1036 | spl_debug_get_subsys(void) { | |
1037 | return spl_debug_subsys; | |
1038 | } | |
1039 | EXPORT_SYMBOL(spl_debug_get_subsys); | |
1040 | ||
1041 | int | |
1042 | spl_debug_set_mb(int mb) | |
1043 | { | |
1044 | int i, j, pages; | |
1045 | int limit = trace_max_debug_mb(); | |
1046 | struct trace_cpu_data *tcd; | |
1047 | ||
1048 | if (mb < num_possible_cpus()) { | |
1049 | printk(KERN_ERR "SPL: Refusing to set debug buffer size to " | |
1050 | "%dMB - lower limit is %d\n", mb, num_possible_cpus()); | |
1051 | return -EINVAL; | |
1052 | } | |
1053 | ||
1054 | if (mb > limit) { | |
1055 | printk(KERN_ERR "SPL: Refusing to set debug buffer size to " | |
1056 | "%dMB - upper limit is %d\n", mb, limit); | |
1057 | return -EINVAL; | |
1058 | } | |
1059 | ||
1060 | mb /= num_possible_cpus(); | |
1061 | pages = mb << (20 - PAGE_SHIFT); | |
1062 | ||
1063 | down_write(&trace_sem); | |
1064 | ||
1065 | tcd_for_each(tcd, i, j) | |
1066 | tcd->tcd_max_pages = (pages * tcd->tcd_pages_factor) / 100; | |
1067 | ||
1068 | up_write(&trace_sem); | |
1069 | ||
1070 | return 0; | |
1071 | } | |
1072 | EXPORT_SYMBOL(spl_debug_set_mb); | |
1073 | ||
1074 | int | |
1075 | spl_debug_get_mb(void) | |
1076 | { | |
1077 | int i, j; | |
1078 | struct trace_cpu_data *tcd; | |
1079 | int total_pages = 0; | |
1080 | ||
1081 | down_read(&trace_sem); | |
1082 | ||
1083 | tcd_for_each(tcd, i, j) | |
1084 | total_pages += tcd->tcd_max_pages; | |
1085 | ||
1086 | up_read(&trace_sem); | |
1087 | ||
1088 | return (total_pages >> (20 - PAGE_SHIFT)) + 1; | |
1089 | } | |
1090 | EXPORT_SYMBOL(spl_debug_get_mb); | |
1091 | ||
1092 | void spl_debug_dumpstack(struct task_struct *tsk) | |
1093 | { | |
1094 | extern void show_task(struct task_struct *); | |
1095 | ||
1096 | if (tsk == NULL) | |
1097 | tsk = current; | |
1098 | ||
892d5106 | 1099 | printk(KERN_ERR "SPL: Showing stack for process %d\n", tsk->pid); |
57d1b188 | 1100 | show_task(tsk); |
1101 | } | |
1102 | EXPORT_SYMBOL(spl_debug_dumpstack); | |
1103 | ||
1104 | void spl_debug_bug(char *file, const char *func, const int line) | |
1105 | { | |
1106 | spl_debug_catastrophe = 1; | |
937879f1 | 1107 | spl_debug_msg(NULL, 0, D_EMERG, file, func, line, "SBUG\n"); |
57d1b188 | 1108 | |
1109 | if (in_interrupt()) { | |
937879f1 | 1110 | panic("SBUG in interrupt.\n"); |
57d1b188 | 1111 | /* not reached */ |
1112 | } | |
1113 | ||
1114 | /* Ensure all debug pages and dumped by current cpu */ | |
1115 | if (spl_debug_panic_on_bug) | |
1116 | spl_panic_in_progress = 1; | |
1117 | ||
1118 | spl_debug_dumpstack(NULL); | |
1119 | spl_debug_dumplog(); | |
1120 | ||
1121 | if (spl_debug_panic_on_bug) | |
937879f1 | 1122 | panic("SBUG"); |
57d1b188 | 1123 | |
1124 | set_task_state(current, TASK_UNINTERRUPTIBLE); | |
1125 | while (1) | |
1126 | schedule(); | |
1127 | } | |
1128 | EXPORT_SYMBOL(spl_debug_bug); | |
1129 | ||
1130 | int | |
1131 | spl_debug_clear_buffer(void) | |
1132 | { | |
1133 | spl_debug_flush_pages(); | |
1134 | return 0; | |
1135 | } | |
1136 | EXPORT_SYMBOL(spl_debug_clear_buffer); | |
1137 | ||
1138 | int | |
1139 | spl_debug_mark_buffer(char *text) | |
1140 | { | |
1141 | CDEBUG(D_WARNING, "*************************************\n"); | |
1142 | CDEBUG(D_WARNING, "DEBUG MARKER: %s\n", text); | |
1143 | CDEBUG(D_WARNING, "*************************************\n"); | |
1144 | ||
1145 | return 0; | |
1146 | } | |
1147 | EXPORT_SYMBOL(spl_debug_mark_buffer); | |
1148 | ||
1149 | static int | |
1150 | panic_notifier(struct notifier_block *self, | |
1151 | unsigned long unused1, void *unused2) | |
1152 | { | |
1153 | if (spl_panic_in_progress) | |
1154 | return 0; | |
1155 | ||
1156 | spl_panic_in_progress = 1; | |
1157 | mb(); | |
1158 | ||
1159 | if (!in_interrupt()) { | |
1160 | while (current->lock_depth >= 0) | |
1161 | unlock_kernel(); | |
1162 | ||
1163 | spl_debug_dumplog_internal((void *)(long)current->pid); | |
1164 | } | |
1165 | ||
1166 | return 0; | |
1167 | } | |
1168 | ||
1169 | static int | |
1170 | trace_init(int max_pages) | |
1171 | { | |
1172 | struct trace_cpu_data *tcd; | |
1173 | int i, j; | |
1174 | ||
1175 | init_rwsem(&trace_sem); | |
1176 | ||
1177 | /* initialize trace_data */ | |
1178 | memset(trace_data, 0, sizeof(trace_data)); | |
1179 | for (i = 0; i < TCD_TYPE_MAX; i++) { | |
1180 | trace_data[i] = kmalloc(sizeof(union trace_data_union) * | |
1181 | NR_CPUS, GFP_KERNEL); | |
1182 | if (trace_data[i] == NULL) | |
1183 | goto out; | |
1184 | } | |
1185 | ||
1186 | tcd_for_each(tcd, i, j) { | |
1187 | tcd->tcd_pages_factor = pages_factor[i]; | |
1188 | tcd->tcd_type = i; | |
1189 | tcd->tcd_cpu = j; | |
1190 | INIT_LIST_HEAD(&tcd->tcd_pages); | |
1191 | INIT_LIST_HEAD(&tcd->tcd_stock_pages); | |
1192 | tcd->tcd_cur_pages = 0; | |
1193 | tcd->tcd_cur_stock_pages = 0; | |
1194 | tcd->tcd_max_pages = (max_pages * pages_factor[i]) / 100; | |
1195 | tcd->tcd_shutting_down = 0; | |
1196 | } | |
1197 | ||
1198 | for (i = 0; i < num_possible_cpus(); i++) { | |
1199 | for (j = 0; j < 3; j++) { | |
1200 | trace_console_buffers[i][j] = | |
1201 | kmalloc(TRACE_CONSOLE_BUFFER_SIZE, | |
1202 | GFP_KERNEL); | |
1203 | ||
1204 | if (trace_console_buffers[i][j] == NULL) | |
1205 | goto out; | |
1206 | } | |
1207 | } | |
1208 | ||
1209 | return 0; | |
1210 | out: | |
1211 | trace_fini(); | |
1212 | printk(KERN_ERR "SPL: Insufficient memory for debug logs\n"); | |
1213 | return -ENOMEM; | |
1214 | } | |
1215 | ||
1216 | int | |
1217 | debug_init(void) | |
1218 | { | |
1219 | int rc, max = spl_debug_mb; | |
1220 | ||
1221 | spl_console_max_delay = SPL_DEFAULT_MAX_DELAY; | |
1222 | spl_console_min_delay = SPL_DEFAULT_MIN_DELAY; | |
1223 | ||
1224 | /* If spl_debug_mb is set to an invalid value or uninitialized | |
1225 | * then just make the total buffers smp_num_cpus TCD_MAX_PAGES */ | |
1226 | if (max > (num_physpages >> (20 - 2 - PAGE_SHIFT)) / 5 || | |
1227 | max >= 512 || max < 0) { | |
1228 | max = TCD_MAX_PAGES; | |
1229 | } else { | |
1230 | max = (max / num_online_cpus()) << (20 - PAGE_SHIFT); | |
1231 | } | |
1232 | ||
1233 | rc = trace_init(max); | |
1234 | if (rc) | |
1235 | return rc; | |
1236 | ||
1237 | atomic_notifier_chain_register(&panic_notifier_list, | |
1238 | &spl_panic_notifier); | |
1239 | return rc; | |
1240 | } | |
1241 | ||
1242 | static void | |
1243 | trace_cleanup_on_cpu(void *info) | |
1244 | { | |
1245 | struct trace_cpu_data *tcd; | |
1246 | struct trace_page *tage; | |
1247 | struct trace_page *tmp; | |
1248 | int i; | |
1249 | ||
1250 | tcd_for_each_type_lock(tcd, i) { | |
1251 | tcd->tcd_shutting_down = 1; | |
1252 | ||
1253 | list_for_each_entry_safe(tage, tmp, &tcd->tcd_pages, linkage) { | |
1254 | __ASSERT_TAGE_INVARIANT(tage); | |
1255 | ||
1256 | list_del(&tage->linkage); | |
1257 | tage_free(tage); | |
1258 | } | |
1259 | tcd->tcd_cur_pages = 0; | |
1260 | } | |
1261 | } | |
1262 | ||
1263 | static void | |
1264 | trace_fini(void) | |
1265 | { | |
1266 | int i, j; | |
1267 | ||
1268 | trace_call_on_all_cpus(trace_cleanup_on_cpu, NULL); | |
1269 | ||
1270 | for (i = 0; i < num_possible_cpus(); i++) { | |
1271 | for (j = 0; j < 3; j++) { | |
1272 | if (trace_console_buffers[i][j] != NULL) { | |
1273 | kfree(trace_console_buffers[i][j]); | |
1274 | trace_console_buffers[i][j] = NULL; | |
1275 | } | |
1276 | } | |
1277 | } | |
1278 | ||
1279 | for (i = 0; trace_data[i] != NULL; i++) { | |
1280 | kfree(trace_data[i]); | |
1281 | trace_data[i] = NULL; | |
1282 | } | |
1283 | } | |
1284 | ||
1285 | void | |
1286 | debug_fini(void) | |
1287 | { | |
1288 | atomic_notifier_chain_unregister(&panic_notifier_list, | |
1289 | &spl_panic_notifier); | |
1290 | trace_fini(); | |
1291 | ||
1292 | return; | |
1293 | } |