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716154c5 BB |
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 | 8 | * This file is part of the SPL, Solaris Porting Layer. |
3d6af2dd | 9 | * For details, see <http://zfsonlinux.org/>. |
716154c5 BB |
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> |
ba062980 | 39 | #include <linux/swap.h> |
377e12f1 | 40 | #include <linux/ratelimit.h> |
57d1b188 | 41 | #include <sys/sysmacros.h> |
17a527cb | 42 | #include <sys/thread.h> |
55abb092 BB |
43 | #include <spl-debug.h> |
44 | #include <spl-trace.h> | |
57d1b188 | 45 | #include <spl-ctl.h> |
57d1b188 | 46 | |
b17edc10 BB |
47 | #ifdef SS_DEBUG_SUBSYS |
48 | #undef SS_DEBUG_SUBSYS | |
57d1b188 | 49 | #endif |
50 | ||
b17edc10 | 51 | #define SS_DEBUG_SUBSYS SS_DEBUG |
57d1b188 | 52 | |
4b2220f0 BB |
53 | /* Debug log support enabled */ |
54 | #ifdef DEBUG_LOG | |
55 | ||
57d1b188 | 56 | unsigned long spl_debug_subsys = ~0; |
57 | EXPORT_SYMBOL(spl_debug_subsys); | |
55abb092 | 58 | module_param(spl_debug_subsys, ulong, 0644); |
57d1b188 | 59 | MODULE_PARM_DESC(spl_debug_subsys, "Subsystem debugging level mask."); |
60 | ||
b17edc10 | 61 | unsigned long spl_debug_mask = SD_CANTMASK; |
57d1b188 | 62 | EXPORT_SYMBOL(spl_debug_mask); |
55abb092 | 63 | module_param(spl_debug_mask, ulong, 0644); |
57d1b188 | 64 | MODULE_PARM_DESC(spl_debug_mask, "Debugging level mask."); |
65 | ||
b17edc10 | 66 | unsigned long spl_debug_printk = SD_CANTMASK; |
57d1b188 | 67 | EXPORT_SYMBOL(spl_debug_printk); |
55abb092 | 68 | module_param(spl_debug_printk, ulong, 0644); |
57d1b188 | 69 | MODULE_PARM_DESC(spl_debug_printk, "Console printk level mask."); |
70 | ||
71 | int spl_debug_mb = -1; | |
72 | EXPORT_SYMBOL(spl_debug_mb); | |
73 | module_param(spl_debug_mb, int, 0644); | |
74 | MODULE_PARM_DESC(spl_debug_mb, "Total debug buffer size."); | |
75 | ||
76 | unsigned int spl_debug_binary = 1; | |
77 | EXPORT_SYMBOL(spl_debug_binary); | |
78 | ||
79 | unsigned int spl_debug_catastrophe; | |
80 | EXPORT_SYMBOL(spl_debug_catastrophe); | |
81 | ||
3626ae6a | 82 | unsigned int spl_debug_panic_on_bug = 0; |
57d1b188 | 83 | EXPORT_SYMBOL(spl_debug_panic_on_bug); |
55abb092 | 84 | module_param(spl_debug_panic_on_bug, uint, 0644); |
57d1b188 | 85 | MODULE_PARM_DESC(spl_debug_panic_on_bug, "Panic on BUG"); |
86 | ||
87 | static char spl_debug_file_name[PATH_MAX]; | |
627a7497 | 88 | char spl_debug_file_path[PATH_MAX] = "/tmp/spl-log"; |
57d1b188 | 89 | |
90 | unsigned int spl_console_ratelimit = 1; | |
91 | EXPORT_SYMBOL(spl_console_ratelimit); | |
92 | ||
93 | long spl_console_max_delay; | |
94 | EXPORT_SYMBOL(spl_console_max_delay); | |
95 | ||
96 | long spl_console_min_delay; | |
97 | EXPORT_SYMBOL(spl_console_min_delay); | |
98 | ||
99 | unsigned int spl_console_backoff = SPL_DEFAULT_BACKOFF; | |
100 | EXPORT_SYMBOL(spl_console_backoff); | |
101 | ||
102 | unsigned int spl_debug_stack; | |
103 | EXPORT_SYMBOL(spl_debug_stack); | |
104 | ||
105 | static int spl_panic_in_progress; | |
106 | ||
107 | union trace_data_union (*trace_data[TCD_TYPE_MAX])[NR_CPUS] __cacheline_aligned; | |
108 | char *trace_console_buffers[NR_CPUS][3]; | |
109 | struct rw_semaphore trace_sem; | |
110 | atomic_t trace_tage_allocated = ATOMIC_INIT(0); | |
111 | ||
7fea96c0 | 112 | static int spl_debug_dump_all_pages(dumplog_priv_t *dp, char *); |
57d1b188 | 113 | static void trace_fini(void); |
114 | ||
115 | ||
116 | /* Memory percentage breakdown by type */ | |
117 | static unsigned int pages_factor[TCD_TYPE_MAX] = { | |
118 | 80, /* 80% pages for TCD_TYPE_PROC */ | |
119 | 10, /* 10% pages for TCD_TYPE_SOFTIRQ */ | |
120 | 10 /* 10% pages for TCD_TYPE_IRQ */ | |
121 | }; | |
122 | ||
57d1b188 | 123 | const char * |
124 | spl_debug_subsys2str(int subsys) | |
125 | { | |
126 | switch (subsys) { | |
127 | default: | |
128 | return NULL; | |
b17edc10 | 129 | case SS_UNDEFINED: |
57d1b188 | 130 | return "undefined"; |
b17edc10 | 131 | case SS_ATOMIC: |
57d1b188 | 132 | return "atomic"; |
b17edc10 | 133 | case SS_KOBJ: |
57d1b188 | 134 | return "kobj"; |
b17edc10 | 135 | case SS_VNODE: |
57d1b188 | 136 | return "vnode"; |
b17edc10 | 137 | case SS_TIME: |
57d1b188 | 138 | return "time"; |
b17edc10 | 139 | case SS_RWLOCK: |
57d1b188 | 140 | return "rwlock"; |
b17edc10 | 141 | case SS_THREAD: |
57d1b188 | 142 | return "thread"; |
b17edc10 | 143 | case SS_CONDVAR: |
57d1b188 | 144 | return "condvar"; |
b17edc10 | 145 | case SS_MUTEX: |
57d1b188 | 146 | return "mutex"; |
b17edc10 | 147 | case SS_RNG: |
57d1b188 | 148 | return "rng"; |
b17edc10 | 149 | case SS_TASKQ: |
57d1b188 | 150 | return "taskq"; |
b17edc10 | 151 | case SS_KMEM: |
57d1b188 | 152 | return "kmem"; |
b17edc10 | 153 | case SS_DEBUG: |
e5bbd245 | 154 | return "debug"; |
b17edc10 | 155 | case SS_GENERIC: |
e5bbd245 | 156 | return "generic"; |
b17edc10 | 157 | case SS_PROC: |
e5bbd245 | 158 | return "proc"; |
b17edc10 | 159 | case SS_MODULE: |
e5bbd245 | 160 | return "module"; |
b17edc10 | 161 | case SS_CRED: |
ec7d53e9 | 162 | return "cred"; |
b17edc10 BB |
163 | case SS_KSTAT: |
164 | return "kstat"; | |
165 | case SS_XDR: | |
166 | return "xdr"; | |
9fe45dc1 BB |
167 | case SS_TSD: |
168 | return "tsd"; | |
5c1967eb BB |
169 | case SS_ZLIB: |
170 | return "zlib"; | |
b17edc10 BB |
171 | case SS_USER1: |
172 | return "user1"; | |
173 | case SS_USER2: | |
174 | return "user2"; | |
175 | case SS_USER3: | |
176 | return "user3"; | |
177 | case SS_USER4: | |
178 | return "user4"; | |
179 | case SS_USER5: | |
180 | return "user5"; | |
181 | case SS_USER6: | |
182 | return "user6"; | |
183 | case SS_USER7: | |
184 | return "user7"; | |
185 | case SS_USER8: | |
186 | return "user8"; | |
57d1b188 | 187 | } |
188 | } | |
189 | ||
190 | const char * | |
191 | spl_debug_dbg2str(int debug) | |
192 | { | |
193 | switch (debug) { | |
194 | default: | |
195 | return NULL; | |
b17edc10 | 196 | case SD_TRACE: |
57d1b188 | 197 | return "trace"; |
b17edc10 | 198 | case SD_INFO: |
57d1b188 | 199 | return "info"; |
b17edc10 | 200 | case SD_WARNING: |
57d1b188 | 201 | return "warning"; |
b17edc10 | 202 | case SD_ERROR: |
57d1b188 | 203 | return "error"; |
b17edc10 | 204 | case SD_EMERG: |
57d1b188 | 205 | return "emerg"; |
b17edc10 | 206 | case SD_CONSOLE: |
57d1b188 | 207 | return "console"; |
b17edc10 | 208 | case SD_IOCTL: |
57d1b188 | 209 | return "ioctl"; |
b17edc10 | 210 | case SD_DPRINTF: |
57d1b188 | 211 | return "dprintf"; |
b17edc10 | 212 | case SD_OTHER: |
57d1b188 | 213 | return "other"; |
214 | } | |
215 | } | |
216 | ||
217 | int | |
218 | spl_debug_mask2str(char *str, int size, unsigned long mask, int is_subsys) | |
219 | { | |
220 | const char *(*fn)(int bit) = is_subsys ? spl_debug_subsys2str : | |
221 | spl_debug_dbg2str; | |
222 | const char *token; | |
223 | int i, bit, len = 0; | |
224 | ||
225 | if (mask == 0) { /* "0" */ | |
226 | if (size > 0) | |
227 | str[0] = '0'; | |
228 | len = 1; | |
229 | } else { /* space-separated tokens */ | |
230 | for (i = 0; i < 32; i++) { | |
231 | bit = 1 << i; | |
232 | ||
233 | if ((mask & bit) == 0) | |
234 | continue; | |
235 | ||
236 | token = fn(bit); | |
237 | if (token == NULL) /* unused bit */ | |
238 | continue; | |
239 | ||
240 | if (len > 0) { /* separator? */ | |
241 | if (len < size) | |
242 | str[len] = ' '; | |
243 | len++; | |
244 | } | |
245 | ||
246 | while (*token != 0) { | |
247 | if (len < size) | |
248 | str[len] = *token; | |
249 | token++; | |
250 | len++; | |
251 | } | |
252 | } | |
253 | } | |
254 | ||
255 | /* terminate 'str' */ | |
256 | if (len < size) | |
257 | str[len] = 0; | |
258 | else | |
259 | str[size - 1] = 0; | |
260 | ||
261 | return len; | |
262 | } | |
263 | ||
264 | static int | |
265 | spl_debug_token2mask(int *mask, const char *str, int len, int is_subsys) | |
266 | { | |
267 | const char *(*fn)(int bit) = is_subsys ? spl_debug_subsys2str : | |
268 | spl_debug_dbg2str; | |
269 | const char *token; | |
270 | int i, j, bit; | |
271 | ||
272 | /* match against known tokens */ | |
273 | for (i = 0; i < 32; i++) { | |
274 | bit = 1 << i; | |
275 | ||
276 | token = fn(bit); | |
277 | if (token == NULL) /* unused? */ | |
278 | continue; | |
279 | ||
280 | /* strcasecmp */ | |
281 | for (j = 0; ; j++) { | |
282 | if (j == len) { /* end of token */ | |
283 | if (token[j] == 0) { | |
284 | *mask = bit; | |
285 | return 0; | |
286 | } | |
287 | break; | |
288 | } | |
289 | ||
290 | if (token[j] == 0) | |
291 | break; | |
292 | ||
293 | if (str[j] == token[j]) | |
294 | continue; | |
295 | ||
296 | if (str[j] < 'A' || 'Z' < str[j]) | |
297 | break; | |
298 | ||
299 | if (str[j] - 'A' + 'a' != token[j]) | |
300 | break; | |
301 | } | |
302 | } | |
303 | ||
304 | return -EINVAL; /* no match */ | |
305 | } | |
306 | ||
307 | int | |
308 | spl_debug_str2mask(unsigned long *mask, const char *str, int is_subsys) | |
309 | { | |
310 | char op = 0; | |
311 | int m = 0, matched, n, t; | |
312 | ||
313 | /* Allow a number for backwards compatibility */ | |
314 | for (n = strlen(str); n > 0; n--) | |
315 | if (!isspace(str[n-1])) | |
316 | break; | |
317 | matched = n; | |
318 | ||
319 | if ((t = sscanf(str, "%i%n", &m, &matched)) >= 1 && matched == n) { | |
320 | *mask = m; | |
321 | return 0; | |
322 | } | |
323 | ||
324 | /* <str> must be a list of debug tokens or numbers separated by | |
325 | * whitespace and optionally an operator ('+' or '-'). If an operator | |
326 | * appears first in <str>, '*mask' is used as the starting point | |
327 | * (relative), otherwise 0 is used (absolute). An operator applies to | |
328 | * all following tokens up to the next operator. */ | |
329 | matched = 0; | |
330 | while (*str != 0) { | |
331 | while (isspace(*str)) /* skip whitespace */ | |
332 | str++; | |
333 | ||
334 | if (*str == 0) | |
335 | break; | |
336 | ||
337 | if (*str == '+' || *str == '-') { | |
338 | op = *str++; | |
339 | ||
340 | /* op on first token == relative */ | |
341 | if (!matched) | |
342 | m = *mask; | |
343 | ||
344 | while (isspace(*str)) /* skip whitespace */ | |
345 | str++; | |
346 | ||
347 | if (*str == 0) /* trailing op */ | |
348 | return -EINVAL; | |
349 | } | |
350 | ||
351 | /* find token length */ | |
352 | for (n = 0; str[n] != 0 && !isspace(str[n]); n++); | |
353 | ||
354 | /* match token */ | |
355 | if (spl_debug_token2mask(&t, str, n, is_subsys) != 0) | |
356 | return -EINVAL; | |
357 | ||
358 | matched = 1; | |
359 | if (op == '-') | |
360 | m &= ~t; | |
361 | else | |
362 | m |= t; | |
363 | ||
364 | str += n; | |
365 | } | |
366 | ||
367 | if (!matched) | |
368 | return -EINVAL; | |
369 | ||
370 | *mask = m; | |
371 | return 0; | |
372 | } | |
373 | ||
57d1b188 | 374 | static void |
375 | spl_debug_dumplog_internal(dumplog_priv_t *dp) | |
376 | { | |
377 | void *journal_info; | |
378 | ||
379 | journal_info = current->journal_info; | |
380 | current->journal_info = NULL; | |
381 | ||
382 | snprintf(spl_debug_file_name, sizeof(spl_debug_file_path) - 1, | |
383 | "%s.%ld.%ld", spl_debug_file_path, | |
384 | get_seconds(), (long)dp->dp_pid); | |
627a7497 | 385 | printk("SPL: Dumping log to %s\n", spl_debug_file_name); |
7fea96c0 | 386 | spl_debug_dump_all_pages(dp, spl_debug_file_name); |
57d1b188 | 387 | |
388 | current->journal_info = journal_info; | |
389 | } | |
390 | ||
391 | static int | |
392 | spl_debug_dumplog_thread(void *arg) | |
393 | { | |
394 | dumplog_priv_t *dp = (dumplog_priv_t *)arg; | |
395 | ||
396 | spl_debug_dumplog_internal(dp); | |
7fea96c0 | 397 | atomic_set(&dp->dp_done, 1); |
57d1b188 | 398 | wake_up(&dp->dp_waitq); |
3d061e9d | 399 | complete_and_exit(NULL, 0); |
57d1b188 | 400 | |
401 | return 0; /* Unreachable */ | |
402 | } | |
403 | ||
7fea96c0 | 404 | /* When flag is set do not use a new thread for the debug dump */ |
57d1b188 | 405 | int |
7fea96c0 | 406 | spl_debug_dumplog(int flags) |
57d1b188 | 407 | { |
408 | struct task_struct *tsk; | |
409 | dumplog_priv_t dp; | |
57d1b188 | 410 | |
7fea96c0 | 411 | init_waitqueue_head(&dp.dp_waitq); |
412 | dp.dp_pid = current->pid; | |
413 | dp.dp_flags = flags; | |
414 | atomic_set(&dp.dp_done, 0); | |
57d1b188 | 415 | |
7fea96c0 | 416 | if (dp.dp_flags & DL_NOTHREAD) { |
417 | spl_debug_dumplog_internal(&dp); | |
418 | } else { | |
57d1b188 | 419 | |
17a527cb | 420 | tsk = spl_kthread_create(spl_debug_dumplog_thread,(void *)&dp,"spl_debug"); |
7fea96c0 | 421 | if (tsk == NULL) |
422 | return -ENOMEM; | |
423 | ||
424 | wake_up_process(tsk); | |
425 | wait_event(dp.dp_waitq, atomic_read(&dp.dp_done)); | |
426 | } | |
57d1b188 | 427 | |
a8ac0b89 | 428 | return 0; |
57d1b188 | 429 | } |
430 | EXPORT_SYMBOL(spl_debug_dumplog); | |
431 | ||
432 | static char * | |
433 | trace_get_console_buffer(void) | |
434 | { | |
435 | int cpu = get_cpu(); | |
436 | int idx; | |
437 | ||
438 | if (in_irq()) { | |
439 | idx = 0; | |
440 | } else if (in_softirq()) { | |
441 | idx = 1; | |
442 | } else { | |
443 | idx = 2; | |
444 | } | |
445 | ||
446 | return trace_console_buffers[cpu][idx]; | |
447 | } | |
448 | ||
449 | static void | |
450 | trace_put_console_buffer(char *buffer) | |
451 | { | |
452 | put_cpu(); | |
453 | } | |
454 | ||
f6c81c5e | 455 | static int |
456 | trace_lock_tcd(struct trace_cpu_data *tcd) | |
57d1b188 | 457 | { |
f6c81c5e | 458 | __ASSERT(tcd->tcd_type < TCD_TYPE_MAX); |
57d1b188 | 459 | |
f6c81c5e | 460 | spin_lock_irqsave(&tcd->tcd_lock, tcd->tcd_lock_flags); |
57d1b188 | 461 | |
f6c81c5e | 462 | return 1; |
57d1b188 | 463 | } |
464 | ||
465 | static void | |
f6c81c5e | 466 | trace_unlock_tcd(struct trace_cpu_data *tcd) |
57d1b188 | 467 | { |
f6c81c5e | 468 | __ASSERT(tcd->tcd_type < TCD_TYPE_MAX); |
469 | ||
470 | spin_unlock_irqrestore(&tcd->tcd_lock, tcd->tcd_lock_flags); | |
57d1b188 | 471 | } |
472 | ||
f6c81c5e | 473 | static struct trace_cpu_data * |
474 | trace_get_tcd(void) | |
57d1b188 | 475 | { |
f6c81c5e | 476 | int cpu; |
477 | struct trace_cpu_data *tcd; | |
478 | ||
479 | cpu = get_cpu(); | |
480 | if (in_irq()) | |
481 | tcd = &(*trace_data[TCD_TYPE_IRQ])[cpu].tcd; | |
482 | else if (in_softirq()) | |
483 | tcd = &(*trace_data[TCD_TYPE_SOFTIRQ])[cpu].tcd; | |
484 | else | |
485 | tcd = &(*trace_data[TCD_TYPE_PROC])[cpu].tcd; | |
57d1b188 | 486 | |
f6c81c5e | 487 | trace_lock_tcd(tcd); |
57d1b188 | 488 | |
f6c81c5e | 489 | return tcd; |
57d1b188 | 490 | } |
491 | ||
492 | static void | |
f6c81c5e | 493 | trace_put_tcd (struct trace_cpu_data *tcd) |
57d1b188 | 494 | { |
f6c81c5e | 495 | trace_unlock_tcd(tcd); |
57d1b188 | 496 | |
f6c81c5e | 497 | put_cpu(); |
57d1b188 | 498 | } |
499 | ||
500 | static void | |
501 | trace_set_debug_header(struct spl_debug_header *header, int subsys, | |
502 | int mask, const int line, unsigned long stack) | |
503 | { | |
504 | struct timeval tv; | |
505 | ||
506 | do_gettimeofday(&tv); | |
507 | ||
508 | header->ph_subsys = subsys; | |
509 | header->ph_mask = mask; | |
510 | header->ph_cpu_id = smp_processor_id(); | |
511 | header->ph_sec = (__u32)tv.tv_sec; | |
512 | header->ph_usec = tv.tv_usec; | |
513 | header->ph_stack = stack; | |
514 | header->ph_pid = current->pid; | |
515 | header->ph_line_num = line; | |
516 | ||
517 | return; | |
518 | } | |
519 | ||
520 | static void | |
521 | trace_print_to_console(struct spl_debug_header *hdr, int mask, const char *buf, | |
522 | int len, const char *file, const char *fn) | |
523 | { | |
524 | char *prefix = "SPL", *ptype = NULL; | |
525 | ||
b17edc10 | 526 | if ((mask & SD_EMERG) != 0) { |
57d1b188 | 527 | prefix = "SPLError"; |
528 | ptype = KERN_EMERG; | |
b17edc10 | 529 | } else if ((mask & SD_ERROR) != 0) { |
57d1b188 | 530 | prefix = "SPLError"; |
531 | ptype = KERN_ERR; | |
b17edc10 | 532 | } else if ((mask & SD_WARNING) != 0) { |
57d1b188 | 533 | prefix = "SPL"; |
534 | ptype = KERN_WARNING; | |
b17edc10 | 535 | } else if ((mask & (SD_CONSOLE | spl_debug_printk)) != 0) { |
57d1b188 | 536 | prefix = "SPL"; |
537 | ptype = KERN_INFO; | |
538 | } | |
539 | ||
b17edc10 | 540 | if ((mask & SD_CONSOLE) != 0) { |
57d1b188 | 541 | printk("%s%s: %.*s", ptype, prefix, len, buf); |
542 | } else { | |
892d5106 | 543 | printk("%s%s: %d:%d:(%s:%d:%s()) %.*s", ptype, prefix, |
544 | hdr->ph_pid, hdr->ph_stack, file, | |
545 | hdr->ph_line_num, fn, len, buf); | |
57d1b188 | 546 | } |
547 | ||
548 | return; | |
549 | } | |
550 | ||
551 | static int | |
552 | trace_max_debug_mb(void) | |
553 | { | |
ba062980 | 554 | return MAX(512, ((totalram_pages >> (20 - PAGE_SHIFT)) * 80) / 100); |
57d1b188 | 555 | } |
556 | ||
57d1b188 | 557 | static struct trace_page * |
558 | tage_alloc(int gfp) | |
559 | { | |
560 | struct page *page; | |
561 | struct trace_page *tage; | |
562 | ||
563 | page = alloc_pages(gfp | __GFP_NOWARN, 0); | |
564 | if (page == NULL) | |
565 | return NULL; | |
566 | ||
567 | tage = kmalloc(sizeof(*tage), gfp); | |
568 | if (tage == NULL) { | |
569 | __free_pages(page, 0); | |
570 | return NULL; | |
571 | } | |
572 | ||
573 | tage->page = page; | |
574 | atomic_inc(&trace_tage_allocated); | |
575 | ||
576 | return tage; | |
577 | } | |
578 | ||
579 | static void | |
580 | tage_free(struct trace_page *tage) | |
581 | { | |
582 | __ASSERT(tage != NULL); | |
583 | __ASSERT(tage->page != NULL); | |
584 | ||
585 | __free_pages(tage->page, 0); | |
586 | kfree(tage); | |
587 | atomic_dec(&trace_tage_allocated); | |
588 | } | |
589 | ||
590 | static struct trace_page * | |
591 | tage_from_list(struct list_head *list) | |
592 | { | |
593 | return list_entry(list, struct trace_page, linkage); | |
594 | } | |
595 | ||
596 | static void | |
597 | tage_to_tail(struct trace_page *tage, struct list_head *queue) | |
598 | { | |
599 | __ASSERT(tage != NULL); | |
600 | __ASSERT(queue != NULL); | |
601 | ||
602 | list_move_tail(&tage->linkage, queue); | |
603 | } | |
604 | ||
605 | /* try to return a page that has 'len' bytes left at the end */ | |
606 | static struct trace_page * | |
607 | trace_get_tage_try(struct trace_cpu_data *tcd, unsigned long len) | |
608 | { | |
609 | struct trace_page *tage; | |
610 | ||
611 | if (tcd->tcd_cur_pages > 0) { | |
612 | __ASSERT(!list_empty(&tcd->tcd_pages)); | |
613 | tage = tage_from_list(tcd->tcd_pages.prev); | |
614 | if (tage->used + len <= PAGE_SIZE) | |
615 | return tage; | |
616 | } | |
617 | ||
618 | if (tcd->tcd_cur_pages < tcd->tcd_max_pages) { | |
619 | if (tcd->tcd_cur_stock_pages > 0) { | |
620 | tage = tage_from_list(tcd->tcd_stock_pages.prev); | |
621 | tcd->tcd_cur_stock_pages--; | |
622 | list_del_init(&tage->linkage); | |
623 | } else { | |
624 | tage = tage_alloc(GFP_ATOMIC); | |
625 | if (tage == NULL) { | |
626 | printk(KERN_WARNING | |
627 | "failure to allocate a tage (%ld)\n", | |
628 | tcd->tcd_cur_pages); | |
629 | return NULL; | |
630 | } | |
631 | } | |
632 | ||
633 | tage->used = 0; | |
634 | tage->cpu = smp_processor_id(); | |
635 | tage->type = tcd->tcd_type; | |
636 | list_add_tail(&tage->linkage, &tcd->tcd_pages); | |
637 | tcd->tcd_cur_pages++; | |
638 | ||
639 | return tage; | |
640 | } | |
641 | ||
642 | return NULL; | |
643 | } | |
644 | ||
645 | /* return a page that has 'len' bytes left at the end */ | |
646 | static struct trace_page * | |
647 | trace_get_tage(struct trace_cpu_data *tcd, unsigned long len) | |
648 | { | |
649 | struct trace_page *tage; | |
650 | ||
651 | __ASSERT(len <= PAGE_SIZE); | |
652 | ||
653 | tage = trace_get_tage_try(tcd, len); | |
654 | if (tage) | |
655 | return tage; | |
656 | ||
657 | if (tcd->tcd_cur_pages > 0) { | |
658 | tage = tage_from_list(tcd->tcd_pages.next); | |
659 | tage->used = 0; | |
660 | tage_to_tail(tage, &tcd->tcd_pages); | |
661 | } | |
662 | ||
663 | return tage; | |
664 | } | |
665 | ||
666 | int | |
55abb092 BB |
667 | spl_debug_msg(void *arg, int subsys, int mask, const char *file, |
668 | const char *fn, const int line, const char *format, ...) | |
57d1b188 | 669 | { |
55abb092 | 670 | spl_debug_limit_state_t *cdls = arg; |
57d1b188 | 671 | struct trace_cpu_data *tcd = NULL; |
b02e9b24 | 672 | struct spl_debug_header header = { 0, }; |
57d1b188 | 673 | struct trace_page *tage; |
674 | /* string_buf is used only if tcd != NULL, and is always set then */ | |
675 | char *string_buf = NULL; | |
676 | char *debug_buf; | |
677 | int known_size; | |
678 | int needed = 85; /* average message length */ | |
679 | int max_nob; | |
680 | va_list ap; | |
681 | int i; | |
57d1b188 | 682 | |
55abb092 | 683 | if (subsys == 0) |
b17edc10 | 684 | subsys = SS_DEBUG_SUBSYS; |
55abb092 BB |
685 | |
686 | if (mask == 0) | |
b17edc10 | 687 | mask = SD_EMERG; |
55abb092 | 688 | |
57d1b188 | 689 | if (strchr(file, '/')) |
690 | file = strrchr(file, '/') + 1; | |
691 | ||
57d1b188 | 692 | tcd = trace_get_tcd(); |
9baf44bc | 693 | trace_set_debug_header(&header, subsys, mask, line, 0); |
57d1b188 | 694 | if (tcd == NULL) |
695 | goto console; | |
696 | ||
697 | if (tcd->tcd_shutting_down) { | |
698 | trace_put_tcd(tcd); | |
699 | tcd = NULL; | |
700 | goto console; | |
701 | } | |
702 | ||
703 | known_size = strlen(file) + 1; | |
704 | if (fn) | |
705 | known_size += strlen(fn) + 1; | |
706 | ||
707 | if (spl_debug_binary) | |
708 | known_size += sizeof(header); | |
709 | ||
710 | /* '2' used because vsnprintf returns real size required for output | |
711 | * _without_ terminating NULL. */ | |
712 | for (i = 0; i < 2; i++) { | |
713 | tage = trace_get_tage(tcd, needed + known_size + 1); | |
714 | if (tage == NULL) { | |
715 | if (needed + known_size > PAGE_SIZE) | |
b17edc10 | 716 | mask |= SD_ERROR; |
57d1b188 | 717 | |
718 | trace_put_tcd(tcd); | |
719 | tcd = NULL; | |
720 | goto console; | |
721 | } | |
722 | ||
723 | string_buf = (char *)page_address(tage->page) + | |
724 | tage->used + known_size; | |
725 | ||
726 | max_nob = PAGE_SIZE - tage->used - known_size; | |
727 | if (max_nob <= 0) { | |
728 | printk(KERN_EMERG "negative max_nob: %i\n", max_nob); | |
b17edc10 | 729 | mask |= SD_ERROR; |
57d1b188 | 730 | trace_put_tcd(tcd); |
731 | tcd = NULL; | |
732 | goto console; | |
733 | } | |
734 | ||
735 | needed = 0; | |
55abb092 | 736 | if (format) { |
55abb092 | 737 | va_start(ap, format); |
8b0eb3f0 | 738 | needed += vsnprintf(string_buf, max_nob, format, ap); |
57d1b188 | 739 | va_end(ap); |
740 | } | |
741 | ||
742 | if (needed < max_nob) | |
743 | break; | |
744 | } | |
745 | ||
57d1b188 | 746 | header.ph_len = known_size + needed; |
747 | debug_buf = (char *)page_address(tage->page) + tage->used; | |
748 | ||
749 | if (spl_debug_binary) { | |
750 | memcpy(debug_buf, &header, sizeof(header)); | |
751 | tage->used += sizeof(header); | |
752 | debug_buf += sizeof(header); | |
753 | } | |
754 | ||
755 | strcpy(debug_buf, file); | |
756 | tage->used += strlen(file) + 1; | |
757 | debug_buf += strlen(file) + 1; | |
758 | ||
759 | if (fn) { | |
760 | strcpy(debug_buf, fn); | |
761 | tage->used += strlen(fn) + 1; | |
762 | debug_buf += strlen(fn) + 1; | |
763 | } | |
764 | ||
765 | __ASSERT(debug_buf == string_buf); | |
766 | ||
767 | tage->used += needed; | |
768 | __ASSERT (tage->used <= PAGE_SIZE); | |
769 | ||
770 | console: | |
771 | if ((mask & spl_debug_printk) == 0) { | |
772 | /* no console output requested */ | |
773 | if (tcd != NULL) | |
774 | trace_put_tcd(tcd); | |
775 | return 1; | |
776 | } | |
777 | ||
778 | if (cdls != NULL) { | |
779 | if (spl_console_ratelimit && cdls->cdls_next != 0 && | |
780 | !time_before(cdls->cdls_next, jiffies)) { | |
781 | /* skipping a console message */ | |
782 | cdls->cdls_count++; | |
783 | if (tcd != NULL) | |
784 | trace_put_tcd(tcd); | |
785 | return 1; | |
786 | } | |
787 | ||
788 | if (time_before(cdls->cdls_next + spl_console_max_delay + | |
789 | (10 * HZ), jiffies)) { | |
790 | /* last timeout was a long time ago */ | |
791 | cdls->cdls_delay /= spl_console_backoff * 4; | |
792 | } else { | |
793 | cdls->cdls_delay *= spl_console_backoff; | |
794 | ||
795 | if (cdls->cdls_delay < spl_console_min_delay) | |
796 | cdls->cdls_delay = spl_console_min_delay; | |
797 | else if (cdls->cdls_delay > spl_console_max_delay) | |
798 | cdls->cdls_delay = spl_console_max_delay; | |
799 | } | |
800 | ||
801 | /* ensure cdls_next is never zero after it's been seen */ | |
802 | cdls->cdls_next = (jiffies + cdls->cdls_delay) | 1; | |
803 | } | |
804 | ||
805 | if (tcd != NULL) { | |
806 | trace_print_to_console(&header, mask, string_buf, needed, file, fn); | |
807 | trace_put_tcd(tcd); | |
808 | } else { | |
809 | string_buf = trace_get_console_buffer(); | |
810 | ||
811 | needed = 0; | |
55abb092 | 812 | if (format != NULL) { |
8b0eb3f0 BB |
813 | va_start(ap, format); |
814 | needed += vsnprintf(string_buf, | |
815 | TRACE_CONSOLE_BUFFER_SIZE, format, ap); | |
816 | va_end(ap); | |
57d1b188 | 817 | } |
818 | trace_print_to_console(&header, mask, | |
819 | string_buf, needed, file, fn); | |
820 | ||
821 | trace_put_console_buffer(string_buf); | |
822 | } | |
823 | ||
824 | if (cdls != NULL && cdls->cdls_count != 0) { | |
825 | string_buf = trace_get_console_buffer(); | |
826 | ||
827 | needed = snprintf(string_buf, TRACE_CONSOLE_BUFFER_SIZE, | |
828 | "Skipped %d previous similar message%s\n", | |
829 | cdls->cdls_count, (cdls->cdls_count > 1) ? "s" : ""); | |
830 | ||
831 | trace_print_to_console(&header, mask, | |
832 | string_buf, needed, file, fn); | |
833 | ||
834 | trace_put_console_buffer(string_buf); | |
835 | cdls->cdls_count = 0; | |
836 | } | |
837 | ||
838 | return 0; | |
839 | } | |
55abb092 | 840 | EXPORT_SYMBOL(spl_debug_msg); |
57d1b188 | 841 | |
842 | /* Do the collect_pages job on a single CPU: assumes that all other | |
843 | * CPUs have been stopped during a panic. If this isn't true for | |
844 | * some arch, this will have to be implemented separately in each arch. | |
845 | */ | |
846 | static void | |
7fea96c0 | 847 | collect_pages_from_single_cpu(struct page_collection *pc) |
57d1b188 | 848 | { |
849 | struct trace_cpu_data *tcd; | |
850 | int i, j; | |
851 | ||
852 | tcd_for_each(tcd, i, j) { | |
853 | list_splice_init(&tcd->tcd_pages, &pc->pc_pages); | |
854 | tcd->tcd_cur_pages = 0; | |
855 | } | |
856 | } | |
857 | ||
858 | static void | |
f6c81c5e | 859 | collect_pages_on_all_cpus(struct page_collection *pc) |
57d1b188 | 860 | { |
861 | struct trace_cpu_data *tcd; | |
f6c81c5e | 862 | int i, cpu; |
57d1b188 | 863 | |
864 | spin_lock(&pc->pc_lock); | |
f6c81c5e | 865 | for_each_possible_cpu(cpu) { |
866 | tcd_for_each_type_lock(tcd, i, cpu) { | |
867 | list_splice_init(&tcd->tcd_pages, &pc->pc_pages); | |
868 | tcd->tcd_cur_pages = 0; | |
869 | } | |
57d1b188 | 870 | } |
871 | spin_unlock(&pc->pc_lock); | |
872 | } | |
873 | ||
874 | static void | |
7fea96c0 | 875 | collect_pages(dumplog_priv_t *dp, struct page_collection *pc) |
57d1b188 | 876 | { |
877 | INIT_LIST_HEAD(&pc->pc_pages); | |
878 | ||
7fea96c0 | 879 | if (spl_panic_in_progress || dp->dp_flags & DL_SINGLE_CPU) |
880 | collect_pages_from_single_cpu(pc); | |
57d1b188 | 881 | else |
f6c81c5e | 882 | collect_pages_on_all_cpus(pc); |
57d1b188 | 883 | } |
884 | ||
885 | static void | |
f6c81c5e | 886 | put_pages_back_on_all_cpus(struct page_collection *pc) |
57d1b188 | 887 | { |
57d1b188 | 888 | struct trace_cpu_data *tcd; |
889 | struct list_head *cur_head; | |
890 | struct trace_page *tage; | |
891 | struct trace_page *tmp; | |
f6c81c5e | 892 | int i, cpu; |
57d1b188 | 893 | |
894 | spin_lock(&pc->pc_lock); | |
57d1b188 | 895 | |
f6c81c5e | 896 | for_each_possible_cpu(cpu) { |
897 | tcd_for_each_type_lock(tcd, i, cpu) { | |
898 | cur_head = tcd->tcd_pages.next; | |
57d1b188 | 899 | |
f6c81c5e | 900 | list_for_each_entry_safe(tage, tmp, &pc->pc_pages, |
901 | linkage) { | |
f6c81c5e | 902 | if (tage->cpu != cpu || tage->type != i) |
903 | continue; | |
57d1b188 | 904 | |
f6c81c5e | 905 | tage_to_tail(tage, cur_head); |
906 | tcd->tcd_cur_pages++; | |
907 | } | |
57d1b188 | 908 | } |
909 | } | |
f6c81c5e | 910 | |
57d1b188 | 911 | spin_unlock(&pc->pc_lock); |
912 | } | |
913 | ||
914 | static void | |
915 | put_pages_back(struct page_collection *pc) | |
916 | { | |
917 | if (!spl_panic_in_progress) | |
f6c81c5e | 918 | put_pages_back_on_all_cpus(pc); |
57d1b188 | 919 | } |
920 | ||
57d1b188 | 921 | static int |
7fea96c0 | 922 | spl_debug_dump_all_pages(dumplog_priv_t *dp, char *filename) |
57d1b188 | 923 | { |
924 | struct page_collection pc; | |
925 | struct file *filp; | |
926 | struct trace_page *tage; | |
927 | struct trace_page *tmp; | |
928 | mm_segment_t oldfs; | |
929 | int rc = 0; | |
930 | ||
931 | down_write(&trace_sem); | |
932 | ||
f0ff89fc | 933 | filp = spl_filp_open(filename, O_CREAT|O_EXCL|O_WRONLY|O_LARGEFILE, |
57d1b188 | 934 | 0600, &rc); |
935 | if (filp == NULL) { | |
936 | if (rc != -EEXIST) | |
937 | printk(KERN_ERR "SPL: Can't open %s for dump: %d\n", | |
938 | filename, rc); | |
939 | goto out; | |
940 | } | |
941 | ||
942 | spin_lock_init(&pc.pc_lock); | |
7fea96c0 | 943 | collect_pages(dp, &pc); |
57d1b188 | 944 | if (list_empty(&pc.pc_pages)) { |
945 | rc = 0; | |
946 | goto close; | |
947 | } | |
948 | ||
949 | oldfs = get_fs(); | |
950 | set_fs(get_ds()); | |
951 | ||
952 | list_for_each_entry_safe(tage, tmp, &pc.pc_pages, linkage) { | |
f0ff89fc BB |
953 | rc = spl_filp_write(filp, page_address(tage->page), |
954 | tage->used, spl_filp_poff(filp)); | |
57d1b188 | 955 | if (rc != (int)tage->used) { |
956 | printk(KERN_WARNING "SPL: Wanted to write %u " | |
957 | "but wrote %d\n", tage->used, rc); | |
958 | put_pages_back(&pc); | |
959 | __ASSERT(list_empty(&pc.pc_pages)); | |
960 | break; | |
961 | } | |
962 | list_del(&tage->linkage); | |
963 | tage_free(tage); | |
964 | } | |
965 | ||
966 | set_fs(oldfs); | |
967 | ||
f0ff89fc | 968 | rc = spl_filp_fsync(filp, 1); |
57d1b188 | 969 | if (rc) |
970 | printk(KERN_ERR "SPL: Unable to sync: %d\n", rc); | |
971 | close: | |
f0ff89fc | 972 | spl_filp_close(filp); |
57d1b188 | 973 | out: |
974 | up_write(&trace_sem); | |
975 | ||
976 | return rc; | |
977 | } | |
978 | ||
979 | static void | |
980 | spl_debug_flush_pages(void) | |
981 | { | |
7fea96c0 | 982 | dumplog_priv_t dp; |
57d1b188 | 983 | struct page_collection pc; |
984 | struct trace_page *tage; | |
985 | struct trace_page *tmp; | |
986 | ||
987 | spin_lock_init(&pc.pc_lock); | |
7fea96c0 | 988 | init_waitqueue_head(&dp.dp_waitq); |
989 | dp.dp_pid = current->pid; | |
990 | dp.dp_flags = 0; | |
991 | atomic_set(&dp.dp_done, 0); | |
57d1b188 | 992 | |
7fea96c0 | 993 | collect_pages(&dp, &pc); |
57d1b188 | 994 | list_for_each_entry_safe(tage, tmp, &pc.pc_pages, linkage) { |
57d1b188 | 995 | list_del(&tage->linkage); |
996 | tage_free(tage); | |
997 | } | |
998 | } | |
999 | ||
1000 | unsigned long | |
1001 | spl_debug_set_mask(unsigned long mask) { | |
1002 | spl_debug_mask = mask; | |
1003 | return 0; | |
1004 | } | |
1005 | EXPORT_SYMBOL(spl_debug_set_mask); | |
1006 | ||
1007 | unsigned long | |
1008 | spl_debug_get_mask(void) { | |
1009 | return spl_debug_mask; | |
1010 | } | |
1011 | EXPORT_SYMBOL(spl_debug_get_mask); | |
1012 | ||
1013 | unsigned long | |
1014 | spl_debug_set_subsys(unsigned long subsys) { | |
1015 | spl_debug_subsys = subsys; | |
1016 | return 0; | |
1017 | } | |
1018 | EXPORT_SYMBOL(spl_debug_set_subsys); | |
1019 | ||
1020 | unsigned long | |
1021 | spl_debug_get_subsys(void) { | |
1022 | return spl_debug_subsys; | |
1023 | } | |
1024 | EXPORT_SYMBOL(spl_debug_get_subsys); | |
1025 | ||
1026 | int | |
1027 | spl_debug_set_mb(int mb) | |
1028 | { | |
1029 | int i, j, pages; | |
1030 | int limit = trace_max_debug_mb(); | |
1031 | struct trace_cpu_data *tcd; | |
1032 | ||
1033 | if (mb < num_possible_cpus()) { | |
1034 | printk(KERN_ERR "SPL: Refusing to set debug buffer size to " | |
1035 | "%dMB - lower limit is %d\n", mb, num_possible_cpus()); | |
1036 | return -EINVAL; | |
1037 | } | |
1038 | ||
1039 | if (mb > limit) { | |
1040 | printk(KERN_ERR "SPL: Refusing to set debug buffer size to " | |
1041 | "%dMB - upper limit is %d\n", mb, limit); | |
1042 | return -EINVAL; | |
1043 | } | |
1044 | ||
1045 | mb /= num_possible_cpus(); | |
1046 | pages = mb << (20 - PAGE_SHIFT); | |
1047 | ||
1048 | down_write(&trace_sem); | |
1049 | ||
1050 | tcd_for_each(tcd, i, j) | |
1051 | tcd->tcd_max_pages = (pages * tcd->tcd_pages_factor) / 100; | |
1052 | ||
1053 | up_write(&trace_sem); | |
1054 | ||
1055 | return 0; | |
1056 | } | |
1057 | EXPORT_SYMBOL(spl_debug_set_mb); | |
1058 | ||
1059 | int | |
1060 | spl_debug_get_mb(void) | |
1061 | { | |
1062 | int i, j; | |
1063 | struct trace_cpu_data *tcd; | |
1064 | int total_pages = 0; | |
1065 | ||
1066 | down_read(&trace_sem); | |
1067 | ||
1068 | tcd_for_each(tcd, i, j) | |
1069 | total_pages += tcd->tcd_max_pages; | |
1070 | ||
1071 | up_read(&trace_sem); | |
1072 | ||
1073 | return (total_pages >> (20 - PAGE_SHIFT)) + 1; | |
1074 | } | |
1075 | EXPORT_SYMBOL(spl_debug_get_mb); | |
1076 | ||
377e12f1 BB |
1077 | /* |
1078 | * Limit the number of stack traces dumped to not more than 5 every | |
1079 | * 60 seconds to prevent denial-of-service attacks from debug code. | |
1080 | */ | |
1081 | DEFINE_RATELIMIT_STATE(dumpstack_ratelimit_state, 60 * HZ, 5); | |
57d1b188 | 1082 | |
377e12f1 BB |
1083 | void |
1084 | spl_debug_dumpstack(struct task_struct *tsk) | |
1085 | { | |
1086 | if (__ratelimit(&dumpstack_ratelimit_state)) { | |
1087 | if (tsk == NULL) | |
1088 | tsk = current; | |
57d1b188 | 1089 | |
377e12f1 BB |
1090 | printk("SPL: Showing stack for process %d\n", tsk->pid); |
1091 | dump_stack(); | |
1092 | } | |
57d1b188 | 1093 | } |
1094 | EXPORT_SYMBOL(spl_debug_dumpstack); | |
1095 | ||
7fea96c0 | 1096 | void spl_debug_bug(char *file, const char *func, const int line, int flags) |
57d1b188 | 1097 | { |
1098 | spl_debug_catastrophe = 1; | |
b17edc10 | 1099 | spl_debug_msg(NULL, 0, SD_EMERG, file, func, line, "SPL PANIC\n"); |
57d1b188 | 1100 | |
55abb092 BB |
1101 | if (in_interrupt()) |
1102 | panic("SPL PANIC in interrupt.\n"); | |
57d1b188 | 1103 | |
97f8f6d7 BB |
1104 | if (in_atomic() || irqs_disabled()) |
1105 | flags |= DL_NOTHREAD; | |
1106 | ||
57d1b188 | 1107 | /* Ensure all debug pages and dumped by current cpu */ |
1108 | if (spl_debug_panic_on_bug) | |
1109 | spl_panic_in_progress = 1; | |
1110 | ||
1111 | spl_debug_dumpstack(NULL); | |
57d1b188 | 1112 | |
4bf3909e BB |
1113 | if (spl_debug_panic_on_bug) { |
1114 | spl_debug_dumplog(flags); | |
55abb092 | 1115 | panic("SPL PANIC"); |
4bf3909e | 1116 | } |
57d1b188 | 1117 | |
1118 | set_task_state(current, TASK_UNINTERRUPTIBLE); | |
1119 | while (1) | |
1120 | schedule(); | |
1121 | } | |
1122 | EXPORT_SYMBOL(spl_debug_bug); | |
1123 | ||
1124 | int | |
1125 | spl_debug_clear_buffer(void) | |
1126 | { | |
1127 | spl_debug_flush_pages(); | |
1128 | return 0; | |
1129 | } | |
1130 | EXPORT_SYMBOL(spl_debug_clear_buffer); | |
1131 | ||
1132 | int | |
1133 | spl_debug_mark_buffer(char *text) | |
1134 | { | |
b17edc10 BB |
1135 | SDEBUG(SD_WARNING, "*************************************\n"); |
1136 | SDEBUG(SD_WARNING, "DEBUG MARKER: %s\n", text); | |
1137 | SDEBUG(SD_WARNING, "*************************************\n"); | |
57d1b188 | 1138 | |
1139 | return 0; | |
1140 | } | |
1141 | EXPORT_SYMBOL(spl_debug_mark_buffer); | |
1142 | ||
57d1b188 | 1143 | static int |
1144 | trace_init(int max_pages) | |
1145 | { | |
1146 | struct trace_cpu_data *tcd; | |
1147 | int i, j; | |
1148 | ||
1149 | init_rwsem(&trace_sem); | |
1150 | ||
1151 | /* initialize trace_data */ | |
1152 | memset(trace_data, 0, sizeof(trace_data)); | |
1153 | for (i = 0; i < TCD_TYPE_MAX; i++) { | |
1154 | trace_data[i] = kmalloc(sizeof(union trace_data_union) * | |
1155 | NR_CPUS, GFP_KERNEL); | |
1156 | if (trace_data[i] == NULL) | |
1157 | goto out; | |
1158 | } | |
1159 | ||
1160 | tcd_for_each(tcd, i, j) { | |
f6c81c5e | 1161 | spin_lock_init(&tcd->tcd_lock); |
57d1b188 | 1162 | tcd->tcd_pages_factor = pages_factor[i]; |
1163 | tcd->tcd_type = i; | |
1164 | tcd->tcd_cpu = j; | |
1165 | INIT_LIST_HEAD(&tcd->tcd_pages); | |
1166 | INIT_LIST_HEAD(&tcd->tcd_stock_pages); | |
1167 | tcd->tcd_cur_pages = 0; | |
1168 | tcd->tcd_cur_stock_pages = 0; | |
1169 | tcd->tcd_max_pages = (max_pages * pages_factor[i]) / 100; | |
1170 | tcd->tcd_shutting_down = 0; | |
1171 | } | |
1172 | ||
1173 | for (i = 0; i < num_possible_cpus(); i++) { | |
1174 | for (j = 0; j < 3; j++) { | |
1175 | trace_console_buffers[i][j] = | |
1176 | kmalloc(TRACE_CONSOLE_BUFFER_SIZE, | |
1177 | GFP_KERNEL); | |
1178 | ||
1179 | if (trace_console_buffers[i][j] == NULL) | |
1180 | goto out; | |
1181 | } | |
1182 | } | |
1183 | ||
1184 | return 0; | |
1185 | out: | |
1186 | trace_fini(); | |
1187 | printk(KERN_ERR "SPL: Insufficient memory for debug logs\n"); | |
1188 | return -ENOMEM; | |
1189 | } | |
1190 | ||
1191 | int | |
1114ae6a | 1192 | spl_debug_init(void) |
57d1b188 | 1193 | { |
1194 | int rc, max = spl_debug_mb; | |
1195 | ||
1196 | spl_console_max_delay = SPL_DEFAULT_MAX_DELAY; | |
1197 | spl_console_min_delay = SPL_DEFAULT_MIN_DELAY; | |
1198 | ||
1199 | /* If spl_debug_mb is set to an invalid value or uninitialized | |
1200 | * then just make the total buffers smp_num_cpus TCD_MAX_PAGES */ | |
ba062980 | 1201 | if (max > (totalram_pages >> (20 - 2 - PAGE_SHIFT)) / 5 || |
57d1b188 | 1202 | max >= 512 || max < 0) { |
1203 | max = TCD_MAX_PAGES; | |
1204 | } else { | |
1205 | max = (max / num_online_cpus()) << (20 - PAGE_SHIFT); | |
1206 | } | |
1207 | ||
1208 | rc = trace_init(max); | |
1209 | if (rc) | |
1210 | return rc; | |
1211 | ||
d50bd9e2 | 1212 | return rc; |
57d1b188 | 1213 | } |
1214 | ||
1215 | static void | |
f6c81c5e | 1216 | trace_cleanup_on_all_cpus(void) |
57d1b188 | 1217 | { |
1218 | struct trace_cpu_data *tcd; | |
1219 | struct trace_page *tage; | |
1220 | struct trace_page *tmp; | |
f6c81c5e | 1221 | int i, cpu; |
57d1b188 | 1222 | |
f6c81c5e | 1223 | for_each_possible_cpu(cpu) { |
1224 | tcd_for_each_type_lock(tcd, i, cpu) { | |
1225 | tcd->tcd_shutting_down = 1; | |
57d1b188 | 1226 | |
f6c81c5e | 1227 | list_for_each_entry_safe(tage, tmp, &tcd->tcd_pages, |
1228 | linkage) { | |
f6c81c5e | 1229 | list_del(&tage->linkage); |
1230 | tage_free(tage); | |
1231 | } | |
1232 | tcd->tcd_cur_pages = 0; | |
57d1b188 | 1233 | } |
57d1b188 | 1234 | } |
1235 | } | |
1236 | ||
1237 | static void | |
1238 | trace_fini(void) | |
1239 | { | |
1240 | int i, j; | |
1241 | ||
f6c81c5e | 1242 | trace_cleanup_on_all_cpus(); |
57d1b188 | 1243 | |
1244 | for (i = 0; i < num_possible_cpus(); i++) { | |
1245 | for (j = 0; j < 3; j++) { | |
1246 | if (trace_console_buffers[i][j] != NULL) { | |
1247 | kfree(trace_console_buffers[i][j]); | |
1248 | trace_console_buffers[i][j] = NULL; | |
1249 | } | |
1250 | } | |
1251 | } | |
1252 | ||
124ca8a5 | 1253 | for (i = 0; i < TCD_TYPE_MAX && trace_data[i] != NULL; i++) { |
57d1b188 | 1254 | kfree(trace_data[i]); |
1255 | trace_data[i] = NULL; | |
1256 | } | |
1257 | } | |
1258 | ||
1259 | void | |
1114ae6a | 1260 | spl_debug_fini(void) |
57d1b188 | 1261 | { |
57d1b188 | 1262 | trace_fini(); |
57d1b188 | 1263 | } |
4b2220f0 BB |
1264 | |
1265 | #endif /* DEBUG_LOG */ |