drivers/staging/lustre/lustre/libcfs/debug.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   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.
   9  *
  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).
  15  *
  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.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2012, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * libcfs/libcfs/debug.c
  37  *
  38  * Author: Phil Schwan <phil@clusterfs.com>
  39  *
  40  */
  41
  42 # define DEBUG_SUBSYSTEM S_LNET
  43
  44 #include "../../include/linux/libcfs/libcfs.h"
  45 #include "tracefile.h"
  46
  47 static char debug_file_name[1024];
  48
  49 unsigned int libcfs_subsystem_debug = ~0;
  50 module_param(libcfs_subsystem_debug, int, 0644);
  51 MODULE_PARM_DESC(libcfs_subsystem_debug, "Lustre kernel debug subsystem mask");
  52 EXPORT_SYMBOL(libcfs_subsystem_debug);
  53
  54 unsigned int libcfs_debug = (D_CANTMASK |
  55                              D_NETERROR | D_HA | D_CONFIG | D_IOCTL);
  56 module_param(libcfs_debug, int, 0644);
  57 MODULE_PARM_DESC(libcfs_debug, "Lustre kernel debug mask");
  58 EXPORT_SYMBOL(libcfs_debug);
  59
  60 unsigned int libcfs_debug_mb = 0;
  61 module_param(libcfs_debug_mb, uint, 0644);
  62 MODULE_PARM_DESC(libcfs_debug_mb, "Total debug buffer size.");
  63 EXPORT_SYMBOL(libcfs_debug_mb);
  64
  65 unsigned int libcfs_printk = D_CANTMASK;
  66 module_param(libcfs_printk, uint, 0644);
  67 MODULE_PARM_DESC(libcfs_printk, "Lustre kernel debug console mask");
  68 EXPORT_SYMBOL(libcfs_printk);
  69
  70 unsigned int libcfs_console_ratelimit = 1;
  71 module_param(libcfs_console_ratelimit, uint, 0644);
  72 MODULE_PARM_DESC(libcfs_console_ratelimit, "Lustre kernel debug console ratelimit (0 to disable)");
  73 EXPORT_SYMBOL(libcfs_console_ratelimit);
  74
  75 unsigned int libcfs_console_max_delay;
  76 module_param(libcfs_console_max_delay, uint, 0644);
  77 MODULE_PARM_DESC(libcfs_console_max_delay, "Lustre kernel debug console max delay (jiffies)");
  78 EXPORT_SYMBOL(libcfs_console_max_delay);
  79
  80 unsigned int libcfs_console_min_delay;
  81 module_param(libcfs_console_min_delay, uint, 0644);
  82 MODULE_PARM_DESC(libcfs_console_min_delay, "Lustre kernel debug console min delay (jiffies)");
  83 EXPORT_SYMBOL(libcfs_console_min_delay);
  84
  85 unsigned int libcfs_console_backoff = CDEBUG_DEFAULT_BACKOFF;
  86 module_param(libcfs_console_backoff, uint, 0644);
  87 MODULE_PARM_DESC(libcfs_console_backoff, "Lustre kernel debug console backoff factor");
  88 EXPORT_SYMBOL(libcfs_console_backoff);
  89
  90 unsigned int libcfs_debug_binary = 1;
  91 EXPORT_SYMBOL(libcfs_debug_binary);
  92
  93 unsigned int libcfs_stack = 3 * THREAD_SIZE / 4;
  94 EXPORT_SYMBOL(libcfs_stack);
  95
  96 unsigned int portal_enter_debugger;
  97 EXPORT_SYMBOL(portal_enter_debugger);
  98
  99 unsigned int libcfs_catastrophe;
 100 EXPORT_SYMBOL(libcfs_catastrophe);
 101
 102 unsigned int libcfs_watchdog_ratelimit = 300;
 103 EXPORT_SYMBOL(libcfs_watchdog_ratelimit);
 104
 105 unsigned int libcfs_panic_on_lbug = 1;
 106 module_param(libcfs_panic_on_lbug, uint, 0644);
 107 MODULE_PARM_DESC(libcfs_panic_on_lbug, "Lustre kernel panic on LBUG");
 108 EXPORT_SYMBOL(libcfs_panic_on_lbug);
 109
 110 atomic_t libcfs_kmemory = ATOMIC_INIT(0);
 111 EXPORT_SYMBOL(libcfs_kmemory);
 112
 113 static wait_queue_head_t debug_ctlwq;
 114
 115 char libcfs_debug_file_path_arr[PATH_MAX] = LIBCFS_DEBUG_FILE_PATH_DEFAULT;
 116
 117 /* We need to pass a pointer here, but elsewhere this must be a const */
 118 char *libcfs_debug_file_path;
 119 module_param(libcfs_debug_file_path, charp, 0644);
 120 MODULE_PARM_DESC(libcfs_debug_file_path,
 121                  "Path for dumping debug logs, set 'NONE' to prevent log dumping");
 122
 123 int libcfs_panic_in_progress;
 124
 125 /* libcfs_debug_token2mask() expects the returned
 126  * string in lower-case */
 127 const char *
 128 libcfs_debug_subsys2str(int subsys)
 129 {
 130         switch (1 << subsys) {
 131         default:
 132                 return NULL;
 133         case S_UNDEFINED:
 134                 return "undefined";
 135         case S_MDC:
 136                 return "mdc";
 137         case S_MDS:
 138                 return "mds";
 139         case S_OSC:
 140                 return "osc";
 141         case S_OST:
 142                 return "ost";
 143         case S_CLASS:
 144                 return "class";
 145         case S_LOG:
 146                 return "log";
 147         case S_LLITE:
 148                 return "llite";
 149         case S_RPC:
 150                 return "rpc";
 151         case S_LNET:
 152                 return "lnet";
 153         case S_LND:
 154                 return "lnd";
 155         case S_PINGER:
 156                 return "pinger";
 157         case S_FILTER:
 158                 return "filter";
 159         case S_ECHO:
 160                 return "echo";
 161         case S_LDLM:
 162                 return "ldlm";
 163         case S_LOV:
 164                 return "lov";
 165         case S_LQUOTA:
 166                 return "lquota";
 167         case S_OSD:
 168                 return "osd";
 169         case S_LMV:
 170                 return "lmv";
 171         case S_SEC:
 172                 return "sec";
 173         case S_GSS:
 174                 return "gss";
 175         case S_MGC:
 176                 return "mgc";
 177         case S_MGS:
 178                 return "mgs";
 179         case S_FID:
 180                 return "fid";
 181         case S_FLD:
 182                 return "fld";
 183         }
 184 }
 185
 186 /* libcfs_debug_token2mask() expects the returned
 187  * string in lower-case */
 188 const char *
 189 libcfs_debug_dbg2str(int debug)
 190 {
 191         switch (1 << debug) {
 192         default:
 193                 return NULL;
 194         case D_TRACE:
 195                 return "trace";
 196         case D_INODE:
 197                 return "inode";
 198         case D_SUPER:
 199                 return "super";
 200         case D_EXT2:
 201                 return "ext2";
 202         case D_MALLOC:
 203                 return "malloc";
 204         case D_CACHE:
 205                 return "cache";
 206         case D_INFO:
 207                 return "info";
 208         case D_IOCTL:
 209                 return "ioctl";
 210         case D_NETERROR:
 211                 return "neterror";
 212         case D_NET:
 213                 return "net";
 214         case D_WARNING:
 215                 return "warning";
 216         case D_BUFFS:
 217                 return "buffs";
 218         case D_OTHER:
 219                 return "other";
 220         case D_DENTRY:
 221                 return "dentry";
 222         case D_NETTRACE:
 223                 return "nettrace";
 224         case D_PAGE:
 225                 return "page";
 226         case D_DLMTRACE:
 227                 return "dlmtrace";
 228         case D_ERROR:
 229                 return "error";
 230         case D_EMERG:
 231                 return "emerg";
 232         case D_HA:
 233                 return "ha";
 234         case D_RPCTRACE:
 235                 return "rpctrace";
 236         case D_VFSTRACE:
 237                 return "vfstrace";
 238         case D_READA:
 239                 return "reada";
 240         case D_MMAP:
 241                 return "mmap";
 242         case D_CONFIG:
 243                 return "config";
 244         case D_CONSOLE:
 245                 return "console";
 246         case D_QUOTA:
 247                 return "quota";
 248         case D_SEC:
 249                 return "sec";
 250         case D_LFSCK:
 251                 return "lfsck";
 252         }
 253 }
 254
 255 int
 256 libcfs_debug_mask2str(char *str, int size, int mask, int is_subsys)
 257 {
 258         const char *(*fn)(int bit) = is_subsys ? libcfs_debug_subsys2str :
 259                                                  libcfs_debug_dbg2str;
 260         int        len = 0;
 261         const char   *token;
 262         int        i;
 263
 264         if (mask == 0) {                        /* "0" */
 265                 if (size > 0)
 266                         str[0] = '0';
 267                 len = 1;
 268         } else {                                /* space-separated tokens */
 269                 for (i = 0; i < 32; i++) {
 270                         if ((mask & (1 << i)) == 0)
 271                                 continue;
 272
 273                         token = fn(i);
 274                         if (token == NULL)            /* unused bit */
 275                                 continue;
 276
 277                         if (len > 0) {            /* separator? */
 278                                 if (len < size)
 279                                         str[len] = ' ';
 280                                 len++;
 281                         }
 282
 283                         while (*token != 0) {
 284                                 if (len < size)
 285                                         str[len] = *token;
 286                                 token++;
 287                                 len++;
 288                         }
 289                 }
 290         }
 291
 292         /* terminate 'str' */
 293         if (len < size)
 294                 str[len] = 0;
 295         else
 296                 str[size - 1] = 0;
 297
 298         return len;
 299 }
 300
 301 int
 302 libcfs_debug_str2mask(int *mask, const char *str, int is_subsys)
 303 {
 304         const char *(*fn)(int bit) = is_subsys ? libcfs_debug_subsys2str :
 305                                                  libcfs_debug_dbg2str;
 306         int      m = 0;
 307         int      matched;
 308         int      n;
 309         int      t;
 310
 311         /* Allow a number for backwards compatibility */
 312
 313         for (n = strlen(str); n > 0; n--)
 314                 if (!isspace(str[n-1]))
 315                         break;
 316         matched = n;
 317         t = sscanf(str, "%i%n", &m, &matched);
 318         if (t >= 1 && matched == n) {
 319                 /* don't print warning for lctl set_param debug=0 or -1 */
 320                 if (m != 0 && m != -1)
 321                         CWARN("You are trying to use a numerical value for the mask - this will be deprecated in a future release.\n");
 322                 *mask = m;
 323                 return 0;
 324         }
 325
 326         return cfs_str2mask(str, fn, mask, is_subsys ? 0 : D_CANTMASK,
 327                             0xffffffff);
 328 }
 329
 330 /**
 331  * Dump Lustre log to ::debug_file_path by calling tracefile_dump_all_pages()
 332  */
 333 void libcfs_debug_dumplog_internal(void *arg)
 334 {
 335         void *journal_info;
 336
 337         journal_info = current->journal_info;
 338         current->journal_info = NULL;
 339
 340         if (strncmp(libcfs_debug_file_path_arr, "NONE", 4) != 0) {
 341                 snprintf(debug_file_name, sizeof(debug_file_name) - 1,
 342                          "%s.%ld.%ld", libcfs_debug_file_path_arr,
 343                          get_seconds(), (long_ptr_t)arg);
 344                 pr_alert("LustreError: dumping log to %s\n",
 345                        debug_file_name);
 346                 cfs_tracefile_dump_all_pages(debug_file_name);
 347                 libcfs_run_debug_log_upcall(debug_file_name);
 348         }
 349
 350         current->journal_info = journal_info;
 351 }
 352
 353 int libcfs_debug_dumplog_thread(void *arg)
 354 {
 355         libcfs_debug_dumplog_internal(arg);
 356         wake_up(&debug_ctlwq);
 357         return 0;
 358 }
 359
 360 void libcfs_debug_dumplog(void)
 361 {
 362         wait_queue_t wait;
 363         struct task_struct *dumper;
 364
 365         /* we're being careful to ensure that the kernel thread is
 366          * able to set our state to running as it exits before we
 367          * get to schedule() */
 368         init_waitqueue_entry(&wait, current);
 369         set_current_state(TASK_INTERRUPTIBLE);
 370         add_wait_queue(&debug_ctlwq, &wait);
 371
 372         dumper = kthread_run(libcfs_debug_dumplog_thread,
 373                              (void *)(long)current_pid(),
 374                              "libcfs_debug_dumper");
 375         if (IS_ERR(dumper))
 376                 pr_err("LustreError: cannot start log dump thread: %ld\n",
 377                        PTR_ERR(dumper));
 378         else
 379                 schedule();
 380
 381         /* be sure to teardown if cfs_create_thread() failed */
 382         remove_wait_queue(&debug_ctlwq, &wait);
 383         set_current_state(TASK_RUNNING);
 384 }
 385 EXPORT_SYMBOL(libcfs_debug_dumplog);
 386
 387 int libcfs_debug_init(unsigned long bufsize)
 388 {
 389         int    rc = 0;
 390         unsigned int max = libcfs_debug_mb;
 391
 392         init_waitqueue_head(&debug_ctlwq);
 393
 394         if (libcfs_console_max_delay <= 0 || /* not set by user or */
 395             libcfs_console_min_delay <= 0 || /* set to invalid values */
 396             libcfs_console_min_delay >= libcfs_console_max_delay) {
 397                 libcfs_console_max_delay = CDEBUG_DEFAULT_MAX_DELAY;
 398                 libcfs_console_min_delay = CDEBUG_DEFAULT_MIN_DELAY;
 399         }
 400
 401         if (libcfs_debug_file_path != NULL) {
 402                 strncpy(libcfs_debug_file_path_arr,
 403                         libcfs_debug_file_path, PATH_MAX-1);
 404                 libcfs_debug_file_path_arr[PATH_MAX - 1] = '\0';
 405         }
 406
 407         /* If libcfs_debug_mb is set to an invalid value or uninitialized
 408          * then just make the total buffers smp_num_cpus * TCD_MAX_PAGES */
 409         if (max > cfs_trace_max_debug_mb() || max < num_possible_cpus()) {
 410                 max = TCD_MAX_PAGES;
 411         } else {
 412                 max = (max / num_possible_cpus());
 413                 max = max << (20 - PAGE_CACHE_SHIFT);
 414         }
 415         rc = cfs_tracefile_init(max);
 416
 417         if (rc == 0)
 418                 libcfs_register_panic_notifier();
 419
 420         return rc;
 421 }
 422
 423 int libcfs_debug_cleanup(void)
 424 {
 425         libcfs_unregister_panic_notifier();
 426         cfs_tracefile_exit();
 427         return 0;
 428 }
 429
 430 int libcfs_debug_clear_buffer(void)
 431 {
 432         cfs_trace_flush_pages();
 433         return 0;
 434 }
 435
 436 /* Debug markers, although printed by S_LNET
 437  * should not be be marked as such. */
 438 #undef DEBUG_SUBSYSTEM
 439 #define DEBUG_SUBSYSTEM S_UNDEFINED
 440 int libcfs_debug_mark_buffer(const char *text)
 441 {
 442         CDEBUG(D_TRACE,
 443                "***************************************************\n");
 444         LCONSOLE(D_WARNING, "DEBUG MARKER: %s\n", text);
 445         CDEBUG(D_TRACE,
 446                "***************************************************\n");
 447
 448         return 0;
 449 }
 450 #undef DEBUG_SUBSYSTEM
 451 #define DEBUG_SUBSYSTEM S_LNET
 452
 453 void libcfs_debug_set_level(unsigned int debug_level)
 454 {
 455         pr_warn("Lustre: Setting portals debug level to %08x\n",
 456                debug_level);
 457         libcfs_debug = debug_level;
 458 }
 459
 460 EXPORT_SYMBOL(libcfs_debug_set_level);