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 void ubi_dump_flash(struct ubi_device *ubi, int pnum, int offset, int len);
  25 void ubi_dump_ec_hdr(const struct ubi_ec_hdr *ec_hdr);
  26 void ubi_dump_vid_hdr(const struct ubi_vid_hdr *vid_hdr);
  27
  28 #include <linux/random.h>
  29
  30 #define ubi_assert(expr)  do {                                               \
  31         if (unlikely(!(expr))) {                                             \
  32                 pr_crit("UBI assert failed in %s at %u (pid %d)\n",          \
  33                        __func__, __LINE__, current->pid);                    \
  34                 dump_stack();                                                \
  35         }                                                                    \
  36 } while (0)
  37
  38 #define ubi_dbg_print_hex_dump(l, ps, pt, r, g, b, len, a)                   \
  39                 print_hex_dump(l, ps, pt, r, g, b, len, a)
  40
  41 #define ubi_dbg_msg(type, fmt, ...) \
  42         pr_debug("UBI DBG " type " (pid %d): " fmt "\n", current->pid,       \
  43                  ##__VA_ARGS__)
  44
  45 /* General debugging messages */
  46 #define dbg_gen(fmt, ...) ubi_dbg_msg("gen", fmt, ##__VA_ARGS__)
  47 /* Messages from the eraseblock association sub-system */
  48 #define dbg_eba(fmt, ...) ubi_dbg_msg("eba", fmt, ##__VA_ARGS__)
  49 /* Messages from the wear-leveling sub-system */
  50 #define dbg_wl(fmt, ...)  ubi_dbg_msg("wl", fmt, ##__VA_ARGS__)
  51 /* Messages from the input/output sub-system */
  52 #define dbg_io(fmt, ...)  ubi_dbg_msg("io", fmt, ##__VA_ARGS__)
  53 /* Initialization and build messages */
  54 #define dbg_bld(fmt, ...) ubi_dbg_msg("bld", fmt, ##__VA_ARGS__)
  55
  56 void ubi_dump_vol_info(const struct ubi_volume *vol);
  57 void ubi_dump_vtbl_record(const struct ubi_vtbl_record *r, int idx);
  58 void ubi_dump_av(const struct ubi_ainf_volume *av);
  59 void ubi_dump_aeb(const struct ubi_ainf_peb *aeb, int type);
  60 void ubi_dump_mkvol_req(const struct ubi_mkvol_req *req);
  61 int ubi_self_check_all_ff(struct ubi_device *ubi, int pnum, int offset,
  62                           int len);
  63 int ubi_debugging_init_dev(struct ubi_device *ubi);
  64 void ubi_debugging_exit_dev(struct ubi_device *ubi);
  65 int ubi_debugfs_init(void);
  66 void ubi_debugfs_exit(void);
  67 int ubi_debugfs_init_dev(struct ubi_device *ubi);
  68 void ubi_debugfs_exit_dev(struct ubi_device *ubi);
  69
  70 /*
  71  * The UBI debugfs directory name pattern and maximum name length (3 for "ubi"
  72  * + 2 for the number plus 1 for the trailing zero byte.
  73  */
  74 #define UBI_DFS_DIR_NAME "ubi%d"
  75 #define UBI_DFS_DIR_LEN  (3 + 2 + 1)
  76
  77 /**
  78  * struct ubi_debug_info - debugging information for an UBI device.
  79  *
  80  * @chk_gen: if UBI general extra checks are enabled
  81  * @chk_io: if UBI I/O extra checks are enabled
  82  * @disable_bgt: disable the background task for testing purposes
  83  * @emulate_bitflips: emulate bit-flips for testing purposes
  84  * @emulate_io_failures: emulate write/erase failures for testing purposes
  85  * @dfs_dir_name: name of debugfs directory containing files of this UBI device
  86  * @dfs_dir: direntry object of the UBI device debugfs directory
  87  * @dfs_chk_gen: debugfs knob to enable UBI general extra checks
  88  * @dfs_chk_io: debugfs knob to enable UBI I/O extra checks
  89  * @dfs_disable_bgt: debugfs knob to disable the background task
  90  * @dfs_emulate_bitflips: debugfs knob to emulate bit-flips
  91  * @dfs_emulate_io_failures: debugfs knob to emulate write/erase failures
  92  */
  93 struct ubi_debug_info {
  94         unsigned int chk_gen:1;
  95         unsigned int chk_io:1;
  96         unsigned int disable_bgt:1;
  97         unsigned int emulate_bitflips:1;
  98         unsigned int emulate_io_failures:1;
  99         char dfs_dir_name[UBI_DFS_DIR_LEN + 1];
 100         struct dentry *dfs_dir;
 101         struct dentry *dfs_chk_gen;
 102         struct dentry *dfs_chk_io;
 103         struct dentry *dfs_disable_bgt;
 104         struct dentry *dfs_emulate_bitflips;
 105         struct dentry *dfs_emulate_io_failures;
 106 };
 107
 108 /**
 109  * ubi_dbg_is_bgt_disabled - if the background thread is disabled.
 110  * @ubi: UBI device description object
 111  *
 112  * Returns non-zero if the UBI background thread is disabled for testing
 113  * purposes.
 114  */
 115 static inline int ubi_dbg_is_bgt_disabled(const struct ubi_device *ubi)
 116 {
 117         return ubi->dbg->disable_bgt;
 118 }
 119
 120 /**
 121  * ubi_dbg_is_bitflip - if it is time to emulate a bit-flip.
 122  * @ubi: UBI device description object
 123  *
 124  * Returns non-zero if a bit-flip should be emulated, otherwise returns zero.
 125  */
 126 static inline int ubi_dbg_is_bitflip(const struct ubi_device *ubi)
 127 {
 128         if (ubi->dbg->emulate_bitflips)
 129                 return !(random32() % 200);
 130         return 0;
 131 }
 132
 133 /**
 134  * ubi_dbg_is_write_failure - if it is time to emulate a write failure.
 135  * @ubi: UBI device description object
 136  *
 137  * Returns non-zero if a write failure should be emulated, otherwise returns
 138  * zero.
 139  */
 140 static inline int ubi_dbg_is_write_failure(const struct ubi_device *ubi)
 141 {
 142         if (ubi->dbg->emulate_io_failures)
 143                 return !(random32() % 500);
 144         return 0;
 145 }
 146
 147 /**
 148  * ubi_dbg_is_erase_failure - if its time to emulate an erase failure.
 149  * @ubi: UBI device description object
 150  *
 151  * Returns non-zero if an erase failure should be emulated, otherwise returns
 152  * zero.
 153  */
 154 static inline int ubi_dbg_is_erase_failure(const struct ubi_device *ubi)
 155 {
 156         if (ubi->dbg->emulate_io_failures)
 157                 return !(random32() % 400);
 158         return 0;
 159 }
 160
 161 #endif /* !__UBI_DEBUG_H__ */