drivers/mtd/ubi/debug.h

   1 /*
   2  * Copyright (c) International Business Machines Corp., 2006
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
  12  * the GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  17  *
  18  * Author: Artem Bityutskiy (Битюцкий Артём)
  19  */
  20
  21 #ifndef __UBI_DEBUG_H__
  22 #define __UBI_DEBUG_H__
  23
  24 #ifdef CONFIG_MTD_UBI_DEBUG
  25 #include <linux/random.h>
  26
  27 #define ubi_assert(expr)  do {                                               \
  28         if (unlikely(!(expr))) {                                             \
  29                 printk(KERN_CRIT "UBI assert failed in %s at %u (pid %d)\n", \
  30                        __func__, __LINE__, current->pid);                    \
  31                 ubi_dbg_dump_stack();                                        \
  32         }                                                                    \
  33 } while (0)
  34
  35 #define dbg_err(fmt, ...) ubi_err(fmt, ##__VA_ARGS__)
  36
  37 #define ubi_dbg_dump_stack() dump_stack()
  38
  39 #define ubi_dbg_print_hex_dump(l, ps, pt, r, g, b, len, a)  \
  40                 print_hex_dump(l, ps, pt, r, g, b, len, a)
  41
  42 #define ubi_dbg_msg(type, fmt, ...) \
  43         pr_debug("UBI DBG " type ": " fmt "\n", ##__VA_ARGS__)
  44
  45 /* Just a debugging messages not related to any specific UBI subsystem */
  46 #define dbg_msg(fmt, ...)                                    \
  47         printk(KERN_DEBUG "UBI DBG (pid %d): %s: " fmt "\n", \
  48                current->pid, __func__, ##__VA_ARGS__)
  49
  50 /* General debugging messages */
  51 #define dbg_gen(fmt, ...) ubi_dbg_msg("gen", fmt, ##__VA_ARGS__)
  52 /* Messages from the eraseblock association sub-system */
  53 #define dbg_eba(fmt, ...) ubi_dbg_msg("eba", fmt, ##__VA_ARGS__)
  54 /* Messages from the wear-leveling sub-system */
  55 #define dbg_wl(fmt, ...)  ubi_dbg_msg("wl", fmt, ##__VA_ARGS__)
  56 /* Messages from the input/output sub-system */
  57 #define dbg_io(fmt, ...)  ubi_dbg_msg("io", fmt, ##__VA_ARGS__)
  58 /* Initialization and build messages */
  59 #define dbg_bld(fmt, ...) ubi_dbg_msg("bld", fmt, ##__VA_ARGS__)
  60
  61 void ubi_dbg_dump_ec_hdr(const struct ubi_ec_hdr *ec_hdr);
  62 void ubi_dbg_dump_vid_hdr(const struct ubi_vid_hdr *vid_hdr);
  63 void ubi_dbg_dump_vol_info(const struct ubi_volume *vol);
  64 void ubi_dbg_dump_vtbl_record(const struct ubi_vtbl_record *r, int idx);
  65 void ubi_dbg_dump_sv(const struct ubi_scan_volume *sv);
  66 void ubi_dbg_dump_seb(const struct ubi_scan_leb *seb, int type);
  67 void ubi_dbg_dump_mkvol_req(const struct ubi_mkvol_req *req);
  68 void ubi_dbg_dump_flash(struct ubi_device *ubi, int pnum, int offset, int len);
  69 int ubi_dbg_check_all_ff(struct ubi_device *ubi, int pnum, int offset, int len);
  70 int ubi_dbg_check_write(struct ubi_device *ubi, const void *buf, int pnum,
  71                         int offset, int len);
  72 int ubi_debugging_init_dev(struct ubi_device *ubi);
  73 void ubi_debugging_exit_dev(struct ubi_device *ubi);
  74 int ubi_debugfs_init(void);
  75 void ubi_debugfs_exit(void);
  76 int ubi_debugfs_init_dev(struct ubi_device *ubi);
  77 void ubi_debugfs_exit_dev(struct ubi_device *ubi);
  78
  79 /*
  80  * The UBI debugfs directory name pattern and maximum name length (3 for "ubi"
  81  * + 2 for the number plus 1 for the trailing zero byte.
  82  */
  83 #define UBI_DFS_DIR_NAME "ubi%d"
  84 #define UBI_DFS_DIR_LEN  (3 + 2 + 1)
  85
  86 /**
  87  * struct ubi_debug_info - debugging information for an UBI device.
  88  *
  89  * @chk_gen: if UBI general extra checks are enabled
  90  * @chk_io: if UBI I/O extra checks are enabled
  91  * @disable_bgt: disable the background task for testing purposes
  92  * @emulate_bitflips: emulate bit-flips for testing purposes
  93  * @emulate_io_failures: emulate write/erase failures for testing purposes
  94  * @dfs_dir_name: name of debugfs directory containing files of this UBI device
  95  * @dfs_dir: direntry object of the UBI device debugfs directory
  96  * @dfs_chk_gen: debugfs knob to enable UBI general extra checks
  97  * @dfs_chk_io: debugfs knob to enable UBI I/O extra checks
  98  * @dfs_disable_bgt: debugfs knob to disable the background task
  99  * @dfs_emulate_bitflips: debugfs knob to emulate bit-flips
 100  * @dfs_emulate_io_failures: debugfs knob to emulate write/erase failures
 101  */
 102 struct ubi_debug_info {
 103         unsigned int chk_gen:1;
 104         unsigned int chk_io:1;
 105         unsigned int disable_bgt:1;
 106         unsigned int emulate_bitflips:1;
 107         unsigned int emulate_io_failures:1;
 108         char dfs_dir_name[UBI_DFS_DIR_LEN + 1];
 109         struct dentry *dfs_dir;
 110         struct dentry *dfs_chk_gen;
 111         struct dentry *dfs_chk_io;
 112         struct dentry *dfs_disable_bgt;
 113         struct dentry *dfs_emulate_bitflips;
 114         struct dentry *dfs_emulate_io_failures;
 115 };
 116
 117 /**
 118  * ubi_dbg_is_bgt_disabled - if the background thread is disabled.
 119  * @ubi: UBI device description object
 120  *
 121  * Returns non-zero if the UBI background thread is disabled for testing
 122  * purposes.
 123  */
 124 static inline int ubi_dbg_is_bgt_disabled(const struct ubi_device *ubi)
 125 {
 126         return ubi->dbg->disable_bgt;
 127 }
 128
 129 /**
 130  * ubi_dbg_is_bitflip - if it is time to emulate a bit-flip.
 131  * @ubi: UBI device description object
 132  *
 133  * Returns non-zero if a bit-flip should be emulated, otherwise returns zero.
 134  */
 135 static inline int ubi_dbg_is_bitflip(const struct ubi_device *ubi)
 136 {
 137         if (ubi->dbg->emulate_bitflips)
 138                 return !(random32() % 200);
 139         return 0;
 140 }
 141
 142 /**
 143  * ubi_dbg_is_write_failure - if it is time to emulate a write failure.
 144  * @ubi: UBI device description object
 145  *
 146  * Returns non-zero if a write failure should be emulated, otherwise returns
 147  * zero.
 148  */
 149 static inline int ubi_dbg_is_write_failure(const struct ubi_device *ubi)
 150 {
 151         if (ubi->dbg->emulate_io_failures)
 152                 return !(random32() % 500);
 153         return 0;
 154 }
 155
 156 /**
 157  * ubi_dbg_is_erase_failure - if its time to emulate an erase failure.
 158  * @ubi: UBI device description object
 159  *
 160  * Returns non-zero if an erase failure should be emulated, otherwise returns
 161  * zero.
 162  */
 163 static inline int ubi_dbg_is_erase_failure(const struct ubi_device *ubi)
 164 {
 165         if (ubi->dbg->emulate_io_failures)
 166                 return !(random32() % 400);
 167         return 0;
 168 }
 169
 170 #else
 171
 172 /* Use "if (0)" to make compiler check arguments even if debugging is off */
 173 #define ubi_assert(expr)  do {                                               \
 174         if (0) {                                                             \
 175                 printk(KERN_CRIT "UBI assert failed in %s at %u (pid %d)\n", \
 176                        __func__, __LINE__, current->pid);                    \
 177         }                                                                    \
 178 } while (0)
 179
 180 #define dbg_err(fmt, ...) do {                                               \
 181         if (0)                                                               \
 182                 ubi_err(fmt, ##__VA_ARGS__);                                 \
 183 } while (0)
 184
 185 #define ubi_dbg_msg(fmt, ...) do {                                           \
 186         if (0)                                                               \
 187                 printk(KERN_DEBUG fmt "\n", ##__VA_ARGS__);                  \
 188 } while (0)
 189
 190 #define dbg_msg(fmt, ...)  ubi_dbg_msg(fmt, ##__VA_ARGS__)
 191 #define dbg_gen(fmt, ...)  ubi_dbg_msg(fmt, ##__VA_ARGS__)
 192 #define dbg_eba(fmt, ...)  ubi_dbg_msg(fmt, ##__VA_ARGS__)
 193 #define dbg_wl(fmt, ...)   ubi_dbg_msg(fmt, ##__VA_ARGS__)
 194 #define dbg_io(fmt, ...)   ubi_dbg_msg(fmt, ##__VA_ARGS__)
 195 #define dbg_bld(fmt, ...)  ubi_dbg_msg(fmt, ##__VA_ARGS__)
 196
 197 static inline void ubi_dbg_dump_stack(void)                          { return; }
 198 static inline void
 199 ubi_dbg_dump_ec_hdr(const struct ubi_ec_hdr *ec_hdr)                 { return; }
 200 static inline void
 201 ubi_dbg_dump_vid_hdr(const struct ubi_vid_hdr *vid_hdr)              { return; }
 202 static inline void
 203 ubi_dbg_dump_vol_info(const struct ubi_volume *vol)                  { return; }
 204 static inline void
 205 ubi_dbg_dump_vtbl_record(const struct ubi_vtbl_record *r, int idx)   { return; }
 206 static inline void ubi_dbg_dump_sv(const struct ubi_scan_volume *sv) { return; }
 207 static inline void ubi_dbg_dump_seb(const struct ubi_scan_leb *seb,
 208                                     int type)                        { return; }
 209 static inline void
 210 ubi_dbg_dump_mkvol_req(const struct ubi_mkvol_req *req)              { return; }
 211 static inline void ubi_dbg_dump_flash(struct ubi_device *ubi,
 212                                       int pnum, int offset, int len) { return; }
 213 static inline void
 214 ubi_dbg_print_hex_dump(const char *l, const char *ps, int pt, int r,
 215                        int g, const void *b, size_t len, bool a)     { return; }
 216 static inline int ubi_dbg_check_all_ff(struct ubi_device *ubi,
 217                                        int pnum, int offset,
 218                                        int len)                    { return 0; }
 219 static inline int ubi_dbg_check_write(struct ubi_device *ubi,
 220                                       const void *buf, int pnum,
 221                                       int offset, int len)         { return 0; }
 222
 223 static inline int ubi_debugging_init_dev(struct ubi_device *ubi)   { return 0; }
 224 static inline void ubi_debugging_exit_dev(struct ubi_device *ubi)  { return; }
 225 static inline int ubi_debugfs_init(void)                           { return 0; }
 226 static inline void ubi_debugfs_exit(void)                          { return; }
 227 static inline int ubi_debugfs_init_dev(struct ubi_device *ubi)     { return 0; }
 228 static inline void ubi_debugfs_exit_dev(struct ubi_device *ubi)    { return; }
 229
 230 static inline int
 231 ubi_dbg_is_bgt_disabled(const struct ubi_device *ubi)              { return 0; }
 232 static inline int ubi_dbg_is_bitflip(const struct ubi_device *ubi) { return 0; }
 233 static inline int
 234 ubi_dbg_is_write_failure(const struct ubi_device *ubi)             { return 0; }
 235 static inline int
 236 ubi_dbg_is_erase_failure(const struct ubi_device *ubi)             { return 0; }
 237
 238 #endif /* !CONFIG_MTD_UBI_DEBUG */
 239 #endif /* !__UBI_DEBUG_H__ */