libcfs/include/libcfs/libcfs_debug.h

   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.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2012, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  *
  31  * libcfs/include/libcfs/libcfs_debug.h
  32  *
  33  * Debug messages and assertions
  34  *
  35  */
  36
  37 #ifndef __LIBCFS_DEBUG_H__
  38 #define __LIBCFS_DEBUG_H__
  39
  40 #include <linux/tty.h>
  41 #include <linux/limits.h>
  42 #include <uapi/linux/lnet/libcfs_debug.h>
  43
  44 /*
  45  *  Debugging
  46  */
  47 extern unsigned int libcfs_subsystem_debug;
  48 extern unsigned int libcfs_stack;
  49 extern unsigned int libcfs_debug;
  50 extern unsigned int libcfs_printk;
  51 extern unsigned int libcfs_watchdog_ratelimit;
  52 extern unsigned int libcfs_console_ratelimit;
  53 extern unsigned int libcfs_console_max_delay;
  54 extern unsigned int libcfs_console_min_delay;
  55 extern unsigned int libcfs_console_backoff;
  56 extern unsigned int libcfs_debug_binary;
  57 extern char *libcfs_debug_file_path;
  58
  59 struct task_struct;
  60
  61 int libcfs_debug_mask2str(char *str, int size, int mask, int is_subsys);
  62 int libcfs_debug_str2mask(int *mask, const char *str, int is_subsys);
  63 void libcfs_debug_dumpstack(struct task_struct *tsk);
  64
  65 /* Has there been an LBUG? */
  66 extern unsigned int libcfs_catastrophe;
  67 extern unsigned int libcfs_panic_on_lbug;
  68
  69 #ifndef DEBUG_SUBSYSTEM
  70 # define DEBUG_SUBSYSTEM S_UNDEFINED
  71 #endif
  72
  73 #define CDEBUG_DEFAULT_MAX_DELAY (cfs_time_seconds(600))         /* jiffies */
  74 #define CDEBUG_DEFAULT_MIN_DELAY ((cfs_time_seconds(1) + 1) / 2) /* jiffies */
  75 #define CDEBUG_DEFAULT_BACKOFF   2
  76 struct cfs_debug_limit_state {
  77         unsigned long   cdls_next;
  78         unsigned int    cdls_delay;
  79         int             cdls_count;
  80 };
  81
  82 struct libcfs_debug_msg_data {
  83         const char                      *msg_file;
  84         const char                      *msg_fn;
  85         int                              msg_subsys;
  86         int                              msg_line;
  87         int                              msg_mask;
  88         struct cfs_debug_limit_state    *msg_cdls;
  89 };
  90
  91 #define LIBCFS_DEBUG_MSG_DATA_INIT(file, func, line, msgdata, mask, cdls)\
  92 do {                                                                    \
  93         (msgdata)->msg_subsys = DEBUG_SUBSYSTEM;                        \
  94         (msgdata)->msg_file   = (file);                                 \
  95         (msgdata)->msg_fn     = (func);                                 \
  96         (msgdata)->msg_line   = (line);                                 \
  97         (msgdata)->msg_mask   = (mask);                                 \
  98         (msgdata)->msg_cdls   = (cdls);                                 \
  99 } while (0)
 100
 101 #define LIBCFS_DEBUG_MSG_DATA_DECL_LOC(file, func, line, msgdata, mask, cdls)\
 102         static struct libcfs_debug_msg_data msgdata = {                 \
 103                 .msg_subsys = DEBUG_SUBSYSTEM,                          \
 104                 .msg_file   = (file),                                   \
 105                 .msg_fn     = (func),                                   \
 106                 .msg_line   = (line),                                   \
 107                 .msg_cdls   = (cdls) };                                 \
 108         msgdata.msg_mask   = (mask)
 109
 110 #define LIBCFS_DEBUG_MSG_DATA_DECL(msgdata, mask, cdls)                 \
 111         LIBCFS_DEBUG_MSG_DATA_DECL_LOC(__FILE__, __func__, __LINE__,    \
 112                                        msgdata, mask, cdls)
 113
 114 #ifdef CDEBUG_ENABLED
 115
 116 #if !defined(__x86_64__)
 117 # ifdef __ia64__
 118 #  define CDEBUG_STACK() (THREAD_SIZE -                                 \
 119                           ((unsigned long)__builtin_dwarf_cfa() &       \
 120                            (THREAD_SIZE - 1)))
 121 # else
 122 #  define CDEBUG_STACK() (THREAD_SIZE -                                 \
 123                           ((unsigned long)__builtin_frame_address(0) &  \
 124                            (THREAD_SIZE - 1)))
 125 # endif /* __ia64__ */
 126
 127 #define __CHECK_STACK_WITH_LOC(file, func, line, msgdata, mask, cdls)   \
 128 do {                                                                    \
 129         if (unlikely(CDEBUG_STACK() > libcfs_stack)) {                  \
 130                 LIBCFS_DEBUG_MSG_DATA_INIT(file, func, line, msgdata,   \
 131                                            D_WARNING, NULL);            \
 132                 libcfs_stack = CDEBUG_STACK();                          \
 133                 libcfs_debug_msg(msgdata, "maximum lustre stack %u\n",  \
 134                                  libcfs_stack);                         \
 135                 (msgdata)->msg_mask = mask;                             \
 136                 (msgdata)->msg_cdls = cdls;                             \
 137                 dump_stack();                                           \
 138                 /*panic("LBUG");*/                                      \
 139         }                                                               \
 140 } while (0)
 141 #else /* __x86_64__ */
 142 #define CDEBUG_STACK() (0L)
 143 #define __CHECK_STACK_WITH_LOC(file, func, line, msgdata, mask, cdls)   \
 144         do {} while (0)
 145 #endif /* __x86_64__ */
 146
 147 #define CFS_CHECK_STACK(msgdata, mask, cdls)                            \
 148         __CHECK_STACK_WITH_LOC(__FILE__, __func__, __LINE__,            \
 149                                msgdata, mask, cdls)
 150 /**
 151  * Filters out logging messages based on mask and subsystem.
 152  */
 153 static inline int cfs_cdebug_show(unsigned int mask, unsigned int subsystem)
 154 {
 155         return mask & D_CANTMASK ||
 156                ((libcfs_debug & mask) && (libcfs_subsystem_debug & subsystem));
 157 }
 158
 159 #  define __CDEBUG_WITH_LOC(file, func, line, mask, cdls, format, ...)  \
 160 do {                                                                    \
 161         static struct libcfs_debug_msg_data msgdata;                    \
 162                                                                         \
 163         __CHECK_STACK_WITH_LOC(file, func, line, &msgdata, mask, cdls); \
 164                                                                         \
 165         if (cfs_cdebug_show(mask, DEBUG_SUBSYSTEM)) {                   \
 166                 LIBCFS_DEBUG_MSG_DATA_INIT(file, func, line,            \
 167                                            &msgdata, mask, cdls);       \
 168                 libcfs_debug_msg(&msgdata, format, ## __VA_ARGS__);     \
 169         }                                                               \
 170 } while (0)
 171
 172 #  define CDEBUG(mask, format, ...)                                     \
 173         __CDEBUG_WITH_LOC(__FILE__, __func__, __LINE__,                 \
 174                           mask, NULL, format, ## __VA_ARGS__)
 175
 176 #  define CDEBUG_LIMIT(mask, format, ...)                               \
 177 do {                                                                    \
 178         static struct cfs_debug_limit_state cdls;                       \
 179                                                                         \
 180         __CDEBUG_WITH_LOC(__FILE__, __func__, __LINE__,                 \
 181                           mask, &cdls, format, ## __VA_ARGS__);         \
 182 } while (0)
 183
 184 # else /* !CDEBUG_ENABLED */
 185 static inline int cfs_cdebug_show(unsigned int mask, unsigned int subsystem)
 186 {
 187         return 0;
 188 }
 189 #  define CDEBUG(mask, format, ...) (void)(0)
 190 #  define CDEBUG_LIMIT(mask, format, ...) (void)(0)
 191 #  warning "CDEBUG IS DISABLED. THIS SHOULD NEVER BE DONE FOR PRODUCTION!"
 192 # endif /* CDEBUG_ENABLED */
 193
 194 /*
 195  * Lustre Error Checksum: calculates checksum
 196  * of Hex number by XORing each bit.
 197  */
 198 #define LERRCHKSUM(hexnum) (((hexnum) & 0xf) ^ ((hexnum) >> 4 & 0xf) ^ \
 199                            ((hexnum) >> 8 & 0xf))
 200
 201 #define CWARN(format, ...)          CDEBUG_LIMIT(D_WARNING, format, ## __VA_ARGS__)
 202 #define CERROR(format, ...)         CDEBUG_LIMIT(D_ERROR, format, ## __VA_ARGS__)
 203 #define CNETERR(format, a...)       CDEBUG_LIMIT(D_NETERROR, format, ## a)
 204 #define CEMERG(format, ...)         CDEBUG_LIMIT(D_EMERG, format, ## __VA_ARGS__)
 205
 206 #define LCONSOLE(mask, format, ...) CDEBUG(D_CONSOLE | (mask), format, ## __VA_ARGS__)
 207 #define LCONSOLE_INFO(format, ...)  CDEBUG_LIMIT(D_CONSOLE, format, ## __VA_ARGS__)
 208 #define LCONSOLE_WARN(format, ...)  CDEBUG_LIMIT(D_CONSOLE | D_WARNING, format, ## __VA_ARGS__)
 209 #define LCONSOLE_ERROR_MSG(errnum, format, ...) CDEBUG_LIMIT(D_CONSOLE | D_ERROR, \
 210                            "%x-%x: " format, errnum, LERRCHKSUM(errnum), ## __VA_ARGS__)
 211 #define LCONSOLE_ERROR(format, ...) LCONSOLE_ERROR_MSG(0x00, format, ## __VA_ARGS__)
 212
 213 #define LCONSOLE_EMERG(format, ...) \
 214         CDEBUG(D_CONSOLE | D_EMERG, format, ## __VA_ARGS__)
 215
 216 int libcfs_debug_msg(struct libcfs_debug_msg_data *msgdata,
 217                      const char *format1, ...)
 218         __printf(2, 3);
 219
 220 /* other external symbols that tracefile provides: */
 221 int cfs_trace_copyout_string(char __user *usr_buffer, int usr_buffer_nob,
 222                              const char *knl_buffer, char *append);
 223
 224 #define LIBCFS_DEBUG_FILE_PATH_DEFAULT "/tmp/lustre-log"
 225
 226 #if defined(CDEBUG_ENTRY_EXIT)
 227
 228 static inline long libcfs_log_return(struct libcfs_debug_msg_data *msgdata, long rc)
 229 {
 230         libcfs_debug_msg(msgdata, "Process leaving (rc=%lu : %ld : %lx)\n",
 231                          rc, rc, rc);
 232         return rc;
 233 }
 234
 235 static inline void libcfs_log_goto(struct libcfs_debug_msg_data *msgdata,
 236                                    const char *label, long rc)
 237 {
 238         libcfs_debug_msg(msgdata,
 239                          "Process leaving via %s (rc=%lu : %ld : %#lx)\n",
 240                          label, rc, rc, rc);
 241 }
 242
 243 # define GOTO(label, rc)                                                      \
 244 do {                                                                          \
 245         if (cfs_cdebug_show(D_TRACE, DEBUG_SUBSYSTEM)) {                      \
 246                 LIBCFS_DEBUG_MSG_DATA_DECL(_goto_data, D_TRACE, NULL);        \
 247                 libcfs_log_goto(&_goto_data, #label, (long)(rc));             \
 248         } else {                                                              \
 249                 (void)(rc);                                                   \
 250         }                                                                     \
 251                                                                               \
 252         goto label;                                                           \
 253 } while (0)
 254
 255 # if BITS_PER_LONG > 32
 256 #  define RETURN(rc)                                                          \
 257 do {                                                                          \
 258         if (cfs_cdebug_show(D_TRACE, DEBUG_SUBSYSTEM)) {                      \
 259                 LIBCFS_DEBUG_MSG_DATA_DECL(msgdata, D_TRACE, NULL);           \
 260                 return (typeof(rc))libcfs_log_return(&msgdata,                \
 261                                                      (long)(rc));             \
 262         }                                                                     \
 263                                                                               \
 264         return rc;                                                            \
 265 } while (0)
 266 # else /* BITS_PER_LONG == 32 */
 267 /* We need an on-stack variable, because we cannot case a 32-bit pointer
 268  * directly to (long long) without generating a complier warning/error, yet
 269  * casting directly to (long) will truncate 64-bit return values. The log
 270  * values will print as 32-bit values, but they always have been. LU-1436
 271  */
 272 #  define RETURN(rc)                                                          \
 273 do {                                                                          \
 274         if (cfs_cdebug_show(D_TRACE, DEBUG_SUBSYSTEM)) {                      \
 275                 typeof(rc) __rc = (rc);                                       \
 276                 LIBCFS_DEBUG_MSG_DATA_DECL(msgdata, D_TRACE, NULL);           \
 277                 libcfs_log_return(&msgdata, (long)__rc);                      \
 278                 return __rc;                                                  \
 279         }                                                                     \
 280                                                                               \
 281         return rc;                                                            \
 282 } while (0)
 283
 284 # endif /* BITS_PER_LONG > 32 */
 285
 286 # define ENTRY  CDEBUG(D_TRACE, "Process entered\n")
 287 # define EXIT   CDEBUG(D_TRACE, "Process leaving\n")
 288
 289 #else /* !CDEBUG_ENTRY_EXIT */
 290
 291 # define GOTO(label, rc)                                                \
 292         do {                                                            \
 293                 ((void)(rc));                                           \
 294                 goto label;                                             \
 295         } while (0)
 296
 297 # define RETURN(rc) return (rc)
 298 # define ENTRY  do { } while (0)
 299 # define EXIT   do { } while (0)
 300
 301 #endif /* CDEBUG_ENTRY_EXIT */
 302
 303 #define RETURN_EXIT                                                     \
 304 do {                                                                    \
 305         EXIT;                                                           \
 306         return;                                                         \
 307 } while (0)
 308
 309 void cfs_debug_init(void);
 310
 311 static inline void cfs_tty_write_msg(const char *msg)
 312 {
 313         struct tty_struct *tty;
 314
 315         tty = get_current_tty();
 316         if (!tty)
 317                 return;
 318         mutex_lock(&tty->atomic_write_lock);
 319         tty_lock(tty);
 320         if (tty->ops->write && tty->count > 0)
 321                 tty->ops->write(tty, msg, strlen(msg));
 322         tty_unlock(tty);
 323         mutex_unlock(&tty->atomic_write_lock);
 324         wake_up_interruptible_poll(&tty->write_wait, POLL_OUT);
 325         tty_kref_put(tty);
 326 }
 327
 328 #endif  /* __LIBCFS_DEBUG_H__ */