4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2011, 2017, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
32 * libcfs/libcfs/debug.c
34 * Author: Phil Schwan <phil@clusterfs.com>
38 # define DEBUG_SUBSYSTEM S_LNET
40 #include <linux/ctype.h>
41 #include <linux/kthread.h>
42 #include <libcfs/libcfs.h>
43 #include "tracefile.h"
45 static char debug_file_name[1024];
47 unsigned int libcfs_subsystem_debug = ~0;
48 module_param(libcfs_subsystem_debug, int, 0644);
49 MODULE_PARM_DESC(libcfs_subsystem_debug, "Lustre kernel debug subsystem mask");
50 EXPORT_SYMBOL(libcfs_subsystem_debug);
52 unsigned int libcfs_debug = (D_CANTMASK | D_NETERROR | D_HA | D_CONFIG |
53 D_IOCTL | D_LFSCK | D_TTY);
54 module_param(libcfs_debug, int, 0644);
55 MODULE_PARM_DESC(libcfs_debug, "Lustre kernel debug mask");
56 EXPORT_SYMBOL(libcfs_debug);
58 static int libcfs_param_debug_mb_set(const char *val,
59 cfs_kernel_param_arg_t *kp)
64 rc = kstrtouint(val, 0, &num);
68 num = cfs_trace_set_debug_mb(num);
70 *((unsigned int *)kp->arg) = num;
71 num = cfs_trace_get_debug_mb();
73 /* This value is more precise */
74 *((unsigned int *)kp->arg) = num;
80 * While debug_mb setting look like unsigned int, in fact
81 * it needs quite a bunch of extra processing, so we define special
82 * debug_mb parameter type with corresponding methods to handle this case
84 static struct kernel_param_ops param_ops_debug_mb = {
85 .set = libcfs_param_debug_mb_set,
86 .get = param_get_uint,
89 #define param_check_debug_mb(name, p) \
90 __param_check(name, p, unsigned int)
92 static unsigned int libcfs_debug_mb;
93 #ifdef HAVE_KERNEL_PARAM_OPS
94 module_param(libcfs_debug_mb, debug_mb, 0644);
96 module_param_call(libcfs_debug_mb, libcfs_param_debug_mb_set, param_get_uint,
97 ¶m_ops_debug_mb, 0644);
99 MODULE_PARM_DESC(libcfs_debug_mb, "Total debug buffer size.");
101 unsigned int libcfs_printk = D_CANTMASK;
102 module_param(libcfs_printk, uint, 0644);
103 MODULE_PARM_DESC(libcfs_printk, "Lustre kernel debug console mask");
105 unsigned int libcfs_console_ratelimit = 1;
106 module_param(libcfs_console_ratelimit, uint, 0644);
107 MODULE_PARM_DESC(libcfs_console_ratelimit, "Lustre kernel debug console ratelimit (0 to disable)");
109 static int param_set_delay_minmax(const char *val,
110 cfs_kernel_param_arg_t *kp,
117 rc = kstrtoint(val, 0, &sec);
121 /* The sysfs setting is in centiseconds */
122 d = cfs_time_seconds(sec) / 100;
123 if (d < min || d > max)
126 *((unsigned int *)kp->arg) = d;
131 static int param_get_delay(char *buffer, cfs_kernel_param_arg_t *kp)
133 unsigned int d = *(unsigned int *)kp->arg;
135 param_get_byte(buffer, kp);
136 return sprintf(buffer, "%lu%c", jiffies_to_msecs(d * 10) / MSEC_PER_SEC,
137 strnchr(buffer, PAGE_SIZE, '\n') ? '\n' : '\0');
140 unsigned int libcfs_console_max_delay;
141 unsigned int libcfs_console_min_delay;
143 static int param_set_console_max_delay(const char *val,
144 cfs_kernel_param_arg_t *kp)
146 return param_set_delay_minmax(val, kp,
147 libcfs_console_min_delay, INT_MAX);
150 static struct kernel_param_ops param_ops_console_max_delay = {
151 .set = param_set_console_max_delay,
152 .get = param_get_delay,
155 #define param_check_console_max_delay(name, p) \
156 __param_check(name, p, unsigned int)
158 #ifdef HAVE_KERNEL_PARAM_OPS
159 module_param(libcfs_console_max_delay, console_max_delay, 0644);
161 module_param_call(libcfs_console_max_delay, param_set_console_max_delay,
162 param_get_delay, ¶m_ops_console_max_delay, 0644);
164 MODULE_PARM_DESC(libcfs_console_max_delay, "Lustre kernel debug console max delay (jiffies)");
166 static int param_set_console_min_delay(const char *val,
167 cfs_kernel_param_arg_t *kp)
169 return param_set_delay_minmax(val, kp,
170 1, libcfs_console_max_delay);
173 static struct kernel_param_ops param_ops_console_min_delay = {
174 .set = param_set_console_min_delay,
175 .get = param_get_delay,
178 #define param_check_console_min_delay(name, p) \
179 __param_check(name, p, unsigned int)
181 #ifdef HAVE_KERNEL_PARAM_OPS
182 module_param(libcfs_console_min_delay, console_min_delay, 0644);
184 module_param_call(libcfs_console_min_delay, param_set_console_min_delay,
185 param_get_delay, ¶m_ops_console_min_delay, 0644);
187 MODULE_PARM_DESC(libcfs_console_min_delay, "Lustre kernel debug console min delay (jiffies)");
189 static int param_set_uint_minmax(const char *val,
190 cfs_kernel_param_arg_t *kp,
191 unsigned int min, unsigned int max)
199 ret = kstrtouint(val, 0, &num);
200 if (ret < 0 || num < min || num > max)
203 *((unsigned int *)kp->arg) = num;
207 static int param_set_uintpos(const char *val,
208 cfs_kernel_param_arg_t *kp)
210 return param_set_uint_minmax(val, kp, 1, -1);
213 static struct kernel_param_ops param_ops_uintpos = {
214 .set = param_set_uintpos,
215 .get = param_get_uint,
218 #define param_check_uintpos(name, p) \
219 __param_check(name, p, unsigned int)
221 unsigned int libcfs_console_backoff = CDEBUG_DEFAULT_BACKOFF;
222 #ifdef HAVE_KERNEL_PARAM_OPS
223 module_param(libcfs_console_backoff, uintpos, 0644);
225 module_param_call(libcfs_console_backoff, param_set_uintpos, param_get_uint,
226 ¶m_ops_uintpos, 0644);
228 MODULE_PARM_DESC(libcfs_console_backoff, "Lustre kernel debug console backoff factor");
230 unsigned int libcfs_debug_binary = 1;
232 unsigned int libcfs_stack = 3 * THREAD_SIZE / 4;
233 EXPORT_SYMBOL(libcfs_stack);
235 unsigned int libcfs_catastrophe;
236 EXPORT_SYMBOL(libcfs_catastrophe);
238 unsigned int libcfs_watchdog_ratelimit = 300;
239 EXPORT_SYMBOL(libcfs_watchdog_ratelimit);
241 unsigned int libcfs_panic_on_lbug = 1;
242 module_param(libcfs_panic_on_lbug, uint, 0644);
243 MODULE_PARM_DESC(libcfs_panic_on_lbug, "Lustre kernel panic on LBUG");
245 atomic_t libcfs_kmemory = ATOMIC_INIT(0);
246 EXPORT_SYMBOL(libcfs_kmemory);
248 static DECLARE_COMPLETION(debug_complete);
250 char libcfs_debug_file_path_arr[PATH_MAX] = LIBCFS_DEBUG_FILE_PATH_DEFAULT;
251 EXPORT_SYMBOL(libcfs_debug_file_path_arr);
253 /* We need to pass a pointer here, but elsewhere this must be a const */
254 static char *libcfs_debug_file_path = LIBCFS_DEBUG_FILE_PATH_DEFAULT;
255 module_param(libcfs_debug_file_path, charp, 0644);
256 MODULE_PARM_DESC(libcfs_debug_file_path,
257 "Path for dumping debug logs, set 'NONE' to prevent log dumping");
259 int libcfs_panic_in_progress;
262 * libcfs_debug_token2mask() expects the returned
263 * string in lower-case
265 static const char *libcfs_debug_subsys2str(int subsys)
267 static const char *libcfs_debug_subsystems[] = LIBCFS_DEBUG_SUBSYS_NAMES;
269 if (subsys >= ARRAY_SIZE(libcfs_debug_subsystems))
272 return libcfs_debug_subsystems[subsys];
276 * libcfs_debug_token2mask() expects the returned
277 * string in lower-case
279 static const char *libcfs_debug_dbg2str(int debug)
281 static const char *libcfs_debug_masks[] = LIBCFS_DEBUG_MASKS_NAMES;
283 if (debug >= ARRAY_SIZE(libcfs_debug_masks))
286 return libcfs_debug_masks[debug];
290 libcfs_debug_mask2str(char *str, int size, int mask, int is_subsys)
292 const char *(*fn)(int bit) = is_subsys ? libcfs_debug_subsys2str :
293 libcfs_debug_dbg2str;
298 if (mask == 0) { /* "0" */
302 } else { /* space-separated tokens */
303 for (i = 0; i < 32; i++) {
304 if ((mask & BIT(i)) == 0)
308 if (token == NULL) /* unused bit */
311 if (len > 0) { /* separator? */
317 while (*token != 0) {
326 /* terminate 'str' */
336 libcfs_debug_str2mask(int *mask, const char *str, int is_subsys)
338 const char *(*fn)(int bit) = is_subsys ? libcfs_debug_subsys2str :
339 libcfs_debug_dbg2str;
345 /* Allow a number for backwards compatibility */
346 for (n = strlen(str); n > 0; n--)
347 if (!isspace(str[n-1]))
351 t = sscanf(str, "%i%n", &m, &matched);
352 if (t >= 1 && matched == n) {
353 /* don't print warning for lctl set_param debug=0 or -1 */
354 if (m != 0 && m != -1)
355 CWARN("You are trying to use a numerical value for the "
356 "mask - this will be deprecated in a future "
362 return cfs_str2mask(str, fn, mask, is_subsys ? 0 : D_CANTMASK,
367 * Dump Lustre log to ::debug_file_path by calling tracefile_dump_all_pages()
369 void libcfs_debug_dumplog_internal(void *arg)
371 static time64_t last_dump_time;
372 time64_t current_time;
375 journal_info = current->journal_info;
376 current->journal_info = NULL;
377 current_time = ktime_get_real_seconds();
379 if (strncmp(libcfs_debug_file_path_arr, "NONE", 4) != 0 &&
380 current_time > last_dump_time) {
381 last_dump_time = current_time;
382 snprintf(debug_file_name, sizeof(debug_file_name) - 1,
383 "%s.%lld.%ld", libcfs_debug_file_path_arr,
384 (s64)current_time, (uintptr_t)arg);
385 pr_alert("LustreError: dumping log to %s\n", debug_file_name);
386 cfs_tracefile_dump_all_pages(debug_file_name);
387 libcfs_run_debug_log_upcall(debug_file_name);
389 current->journal_info = journal_info;
392 static int libcfs_debug_dumplog_thread(void *arg)
394 libcfs_debug_dumplog_internal(arg);
395 complete(&debug_complete);
399 static DEFINE_MUTEX(libcfs_debug_dumplog_lock);
401 void libcfs_debug_dumplog(void)
403 struct task_struct *dumper;
407 if (mutex_trylock(&libcfs_debug_dumplog_lock) == 0)
410 /* If a previous call was interrupted, debug_complete->done
411 * might be elevated, and so we won't actually wait here.
412 * So we reinit the completion to ensure we wait for
413 * one thread to complete, though it might not be the one
414 * we start if there are overlaping thread.
416 reinit_completion(&debug_complete);
417 dumper = kthread_run(libcfs_debug_dumplog_thread,
418 (void *)(long)current->pid,
419 "libcfs_debug_dumper");
421 pr_err("LustreError: cannot start log dump thread: rc = %ld\n",
424 wait_for_completion_interruptible(&debug_complete);
426 mutex_unlock(&libcfs_debug_dumplog_lock);
428 EXPORT_SYMBOL(libcfs_debug_dumplog);
430 int libcfs_debug_init(unsigned long bufsize)
433 unsigned int max = libcfs_debug_mb;
435 if (libcfs_console_max_delay <= 0 || /* not set by user or */
436 libcfs_console_min_delay <= 0 || /* set to invalid values */
437 libcfs_console_min_delay >= libcfs_console_max_delay) {
438 libcfs_console_max_delay = CDEBUG_DEFAULT_MAX_DELAY;
439 libcfs_console_min_delay = CDEBUG_DEFAULT_MIN_DELAY;
442 if (libcfs_debug_file_path != NULL) {
443 strlcpy(libcfs_debug_file_path_arr,
444 libcfs_debug_file_path,
445 sizeof(libcfs_debug_file_path_arr));
448 /* If libcfs_debug_mb is uninitialized then just make the
449 * total buffers smp_num_cpus * TCD_MAX_PAGES
451 if (max < num_possible_cpus()) {
454 max = (max / num_possible_cpus());
455 max = (max << (20 - PAGE_SHIFT));
458 rc = cfs_tracefile_init(max);
462 libcfs_register_panic_notifier();
463 kernel_param_lock(THIS_MODULE);
464 if (libcfs_debug_mb == 0)
465 libcfs_debug_mb = cfs_trace_get_debug_mb();
466 kernel_param_unlock(THIS_MODULE);
470 int libcfs_debug_cleanup(void)
472 libcfs_unregister_panic_notifier();
473 kernel_param_lock(THIS_MODULE);
474 cfs_tracefile_exit();
475 kernel_param_unlock(THIS_MODULE);
479 int libcfs_debug_clear_buffer(void)
481 cfs_trace_flush_pages();
486 * Debug markers, although printed by S_LNET
487 * should not be be marked as such.
489 #undef DEBUG_SUBSYSTEM
490 #define DEBUG_SUBSYSTEM S_UNDEFINED
491 int libcfs_debug_mark_buffer(const char *text)
493 CDEBUG(D_TRACE, "**************************************************\n");
494 LCONSOLE(D_WARNING, "DEBUG MARKER: %s\n", text);
495 CDEBUG(D_TRACE, "**************************************************\n");
499 #undef DEBUG_SUBSYSTEM
500 #define DEBUG_SUBSYSTEM S_LNET
502 long libcfs_log_return(struct libcfs_debug_msg_data *msgdata, long rc)
504 libcfs_debug_msg(msgdata, "Process leaving (rc=%lu : %ld : %lx)\n",
508 EXPORT_SYMBOL(libcfs_log_return);
510 void libcfs_log_goto(struct libcfs_debug_msg_data *msgdata, const char *label,
513 libcfs_debug_msg(msgdata, "Process leaving via %s (rc=%lu : %ld"
514 " : %#lx)\n", label, rc, rc, rc);
516 EXPORT_SYMBOL(libcfs_log_goto);