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_debug;
  49 extern unsigned int libcfs_printk;
  50 extern unsigned int libcfs_watchdog_ratelimit;
  51 extern unsigned int libcfs_console_ratelimit;
  52 extern unsigned int libcfs_console_max_delay;
  53 extern unsigned int libcfs_console_min_delay;
  54 extern unsigned int libcfs_console_backoff;
  55 extern unsigned int libcfs_debug_binary;
  56 extern char *libcfs_debug_file_path;
  57
  58 struct task_struct;
  59
  60 int libcfs_debug_mask2str(char *str, int size, int mask, int is_subsys);
  61 int libcfs_debug_str2mask(int *mask, const char *str, int is_subsys);
  62 void libcfs_debug_dumpstack(struct task_struct *tsk);
  63
  64 /* Has there been an LBUG? */
  65 extern unsigned int libcfs_catastrophe;
  66 extern unsigned int libcfs_panic_on_lbug;
  67 extern bool libcfs_debug_raw_pointers;
  68
  69 int debug_format_buffer_alloc_buffers(void);
  70 void debug_format_buffer_free_buffers(void);
  71 bool get_debug_raw_pointers(void);
  72 void set_debug_raw_pointers(bool value);
  73
  74 #ifndef DEBUG_SUBSYSTEM
  75 # define DEBUG_SUBSYSTEM S_UNDEFINED
  76 #endif
  77
  78 #define CDEBUG_DEFAULT_MAX_DELAY (cfs_time_seconds(600))         /* jiffies */
  79 #define CDEBUG_DEFAULT_MIN_DELAY ((cfs_time_seconds(1) + 1) / 2) /* jiffies */
  80 #define CDEBUG_DEFAULT_BACKOFF   2
  81 struct cfs_debug_limit_state {
  82         unsigned long   cdls_next;
  83         unsigned int    cdls_delay;
  84         int             cdls_count;
  85 };
  86
  87 struct libcfs_debug_msg_data {
  88         const char                      *msg_file;
  89         const char                      *msg_fn;
  90         int                              msg_subsys;
  91         int                              msg_line;
  92         int                              msg_mask;
  93         struct cfs_debug_limit_state    *msg_cdls;
  94 };
  95
  96 #define LIBCFS_DEBUG_MSG_DATA_INIT(file, func, line, msgdata, mask, cdls)\
  97 do {                                                                    \
  98         (msgdata)->msg_subsys = DEBUG_SUBSYSTEM;                        \
  99         (msgdata)->msg_file   = (file);                                 \
 100         (msgdata)->msg_fn     = (func);                                 \
 101         (msgdata)->msg_line   = (line);                                 \
 102         (msgdata)->msg_mask   = (mask);                                 \
 103         (msgdata)->msg_cdls   = (cdls);                                 \
 104 } while (0)
 105
 106 #define LIBCFS_DEBUG_MSG_DATA_DECL_LOC(file, func, line, msgdata, mask, cdls)\
 107         static struct libcfs_debug_msg_data msgdata = {                 \
 108                 .msg_subsys = DEBUG_SUBSYSTEM,                          \
 109                 .msg_file   = (file),                                   \
 110                 .msg_fn     = (func),                                   \
 111                 .msg_line   = (line),                                   \
 112                 .msg_cdls   = (cdls) };                                 \
 113         msgdata.msg_mask   = (mask)
 114
 115 #define LIBCFS_DEBUG_MSG_DATA_DECL(msgdata, mask, cdls)                 \
 116         LIBCFS_DEBUG_MSG_DATA_DECL_LOC(__FILE__, __func__, __LINE__,    \
 117                                        msgdata, mask, cdls)
 118
 119 #ifdef CDEBUG_ENABLED
 120
 121 /**
 122  * Filters out logging messages based on mask and subsystem.
 123  */
 124 static inline int cfs_cdebug_show(unsigned int mask, unsigned int subsystem)
 125 {
 126         return mask & D_CANTMASK ||
 127                ((libcfs_debug & mask) && (libcfs_subsystem_debug & subsystem));
 128 }
 129
 130 #  define __CDEBUG_WITH_LOC(file, func, line, mask, cdls, format, ...)  \
 131 do {                                                                    \
 132         static struct libcfs_debug_msg_data msgdata;                    \
 133                                                                         \
 134         if (cfs_cdebug_show(mask, DEBUG_SUBSYSTEM)) {                   \
 135                 LIBCFS_DEBUG_MSG_DATA_INIT(file, func, line,            \
 136                                            &msgdata, mask, cdls);       \
 137                 libcfs_debug_msg(&msgdata, format, ## __VA_ARGS__);     \
 138         }                                                               \
 139 } while (0)
 140
 141 #  define CDEBUG(mask, format, ...)                                     \
 142         __CDEBUG_WITH_LOC(__FILE__, __func__, __LINE__,                 \
 143                           mask, NULL, format, ## __VA_ARGS__)
 144
 145 #  define CDEBUG_LIMIT(mask, format, ...)                               \
 146 do {                                                                    \
 147         static struct cfs_debug_limit_state cdls;                       \
 148                                                                         \
 149         __CDEBUG_WITH_LOC(__FILE__, __func__, __LINE__,                 \
 150                           mask, &cdls, format, ## __VA_ARGS__);         \
 151 } while (0)
 152
 153 #  define CDEBUG_LIMIT_LOC(file, func, line, mask, format, ...)         \
 154 do {                                                                    \
 155         static struct cfs_debug_limit_state cdls;                       \
 156                                                                         \
 157         __CDEBUG_WITH_LOC(file, func, line,                             \
 158                           mask, &cdls, format, ## __VA_ARGS__);         \
 159 } while (0)
 160
 161 # else /* !CDEBUG_ENABLED */
 162 static inline int cfs_cdebug_show(unsigned int mask, unsigned int subsystem)
 163 {
 164         return 0;
 165 }
 166 #  define CDEBUG(mask, format, ...) (void)(0)
 167 #  define CDEBUG_LIMIT(mask, format, ...) (void)(0)
 168 #  define CDEBUG_LIMIT_LOC(file, func, line, mask, format, ...) (void)(0)
 169 #  warning "CDEBUG IS DISABLED. THIS SHOULD NEVER BE DONE FOR PRODUCTION!"
 170 # endif /* CDEBUG_ENABLED */
 171
 172 /*
 173  * Lustre Error Checksum: calculates checksum
 174  * of Hex number by XORing each bit.
 175  */
 176 #define LERRCHKSUM(hexnum) (((hexnum) & 0xf) ^ ((hexnum) >> 4 & 0xf) ^ \
 177                            ((hexnum) >> 8 & 0xf))
 178
 179 #define CWARN(format, ...)          CDEBUG_LIMIT(D_WARNING, format, ## __VA_ARGS__)
 180 #define CERROR(format, ...)         CDEBUG_LIMIT(D_ERROR, format, ## __VA_ARGS__)
 181 #define CNETERR(format, a...)       CDEBUG_LIMIT(D_NETERROR, format, ## a)
 182 #define CEMERG(format, ...)         CDEBUG_LIMIT(D_EMERG, format, ## __VA_ARGS__)
 183
 184 #define LCONSOLE(mask, format, ...) CDEBUG(D_CONSOLE | (mask), format, ## __VA_ARGS__)
 185 #define LCONSOLE_INFO(format, ...)  CDEBUG_LIMIT(D_CONSOLE, format, ## __VA_ARGS__)
 186 #define LCONSOLE_WARN(format, ...)  CDEBUG_LIMIT(D_CONSOLE | D_WARNING, format, ## __VA_ARGS__)
 187 #define LCONSOLE_ERROR(format, ...) CDEBUG_LIMIT(D_CONSOLE | D_ERROR, format, ## __VA_ARGS__)
 188 #define LCONSOLE_EMERG(format, ...) CDEBUG(D_CONSOLE | D_EMERG, format, ## __VA_ARGS__)
 189
 190 void libcfs_debug_msg(struct libcfs_debug_msg_data *msgdata,
 191                       const char *format1, ...)
 192         __printf(2, 3);
 193
 194 /* other external symbols that tracefile provides: */
 195 int cfs_trace_copyout_string(char __user *usr_buffer, int usr_buffer_nob,
 196                              const char *knl_buffer, char *append);
 197
 198 #define LIBCFS_DEBUG_FILE_PATH_DEFAULT "/tmp/lustre-log"
 199
 200 #if defined(CDEBUG_ENTRY_EXIT)
 201
 202 static inline long libcfs_log_return(struct libcfs_debug_msg_data *msgdata, long rc)
 203 {
 204         libcfs_debug_msg(msgdata, "Process leaving (rc=%lu : %ld : %lx)\n",
 205                          rc, rc, rc);
 206         return rc;
 207 }
 208
 209 static inline void libcfs_log_goto(struct libcfs_debug_msg_data *msgdata,
 210                                    const char *label, long rc)
 211 {
 212         libcfs_debug_msg(msgdata,
 213                          "Process leaving via %s (rc=%lu : %ld : %#lx)\n",
 214                          label, rc, rc, rc);
 215 }
 216
 217 # define GOTO(label, rc)                                                      \
 218 do {                                                                          \
 219         if (cfs_cdebug_show(D_TRACE, DEBUG_SUBSYSTEM)) {                      \
 220                 LIBCFS_DEBUG_MSG_DATA_DECL(_goto_data, D_TRACE, NULL);        \
 221                 libcfs_log_goto(&_goto_data, #label, (long)(rc));             \
 222         } else {                                                              \
 223                 (void)(rc);                                                   \
 224         }                                                                     \
 225                                                                               \
 226         goto label;                                                           \
 227 } while (0)
 228
 229 # if BITS_PER_LONG > 32
 230 #  define RETURN(rc)                                                          \
 231 do {                                                                          \
 232         if (cfs_cdebug_show(D_TRACE, DEBUG_SUBSYSTEM)) {                      \
 233                 LIBCFS_DEBUG_MSG_DATA_DECL(msgdata, D_TRACE, NULL);           \
 234                 return (typeof(rc))libcfs_log_return(&msgdata,                \
 235                                                      (long)(rc));             \
 236         }                                                                     \
 237                                                                               \
 238         return rc;                                                            \
 239 } while (0)
 240 # else /* BITS_PER_LONG == 32 */
 241 /* We need an on-stack variable, because we cannot case a 32-bit pointer
 242  * directly to (long long) without generating a complier warning/error, yet
 243  * casting directly to (long) will truncate 64-bit return values. The log
 244  * values will print as 32-bit values, but they always have been. LU-1436
 245  */
 246 #  define RETURN(rc)                                                          \
 247 do {                                                                          \
 248         if (cfs_cdebug_show(D_TRACE, DEBUG_SUBSYSTEM)) {                      \
 249                 typeof(rc) __rc = (rc);                                       \
 250                 LIBCFS_DEBUG_MSG_DATA_DECL(msgdata, D_TRACE, NULL);           \
 251                 libcfs_log_return(&msgdata, (long)__rc);                      \
 252                 return __rc;                                                  \
 253         }                                                                     \
 254                                                                               \
 255         return rc;                                                            \
 256 } while (0)
 257
 258 # endif /* BITS_PER_LONG > 32 */
 259
 260 # define ENTRY  CDEBUG(D_TRACE, "Process entered\n")
 261 # define EXIT   CDEBUG(D_TRACE, "Process leaving\n")
 262
 263 #else /* !CDEBUG_ENTRY_EXIT */
 264
 265 # define GOTO(label, rc)                                                \
 266         do {                                                            \
 267                 ((void)(rc));                                           \
 268                 goto label;                                             \
 269         } while (0)
 270
 271 # define RETURN(rc) return (rc)
 272 # define ENTRY  do { } while (0)
 273 # define EXIT   do { } while (0)
 274
 275 #endif /* CDEBUG_ENTRY_EXIT */
 276
 277 #define RETURN_EXIT                                                     \
 278 do {                                                                    \
 279         EXIT;                                                           \
 280         return;                                                         \
 281 } while (0)
 282
 283 static inline void cfs_tty_write_msg(const char *msg)
 284 {
 285         struct tty_struct *tty;
 286
 287         tty = get_current_tty();
 288         if (!tty)
 289                 return;
 290         mutex_lock(&tty->atomic_write_lock);
 291         tty_lock(tty);
 292         if (tty->ops->write && tty->count > 0)
 293                 tty->ops->write(tty, msg, strlen(msg));
 294         tty_unlock(tty);
 295         mutex_unlock(&tty->atomic_write_lock);
 296         wake_up_interruptible_poll(&tty->write_wait, POLL_OUT);
 297         tty_kref_put(tty);
 298 }
 299
 300 #endif  /* __LIBCFS_DEBUG_H__ */