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                 printk(KERN_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 ": " fmt "\n", ##__VA_ARGS__)
  43
  44 /* Just a debugging messages not related to any specific UBI subsystem */
  45 #define dbg_msg(fmt, ...)                                    \
  46         printk(KERN_DEBUG "UBI DBG (pid %d): %s: " fmt "\n", \
  47                current->pid, __func__, ##__VA_ARGS__)
  48
  49 /* General debugging messages */
  50 #define dbg_gen(fmt, ...) ubi_dbg_msg("gen", fmt, ##__VA_ARGS__)
  51 /* Messages from the eraseblock association sub-system */
  52 #define dbg_eba(fmt, ...) ubi_dbg_msg("eba", fmt, ##__VA_ARGS__)
  53 /* Messages from the wear-leveling sub-system */
  54 #define dbg_wl(fmt, ...)  ubi_dbg_msg("wl", fmt, ##__VA_ARGS__)
  55 /* Messages from the input/output sub-system */
  56 #define dbg_io(fmt, ...)  ubi_dbg_msg("io", fmt, ##__VA_ARGS__)
  57 /* Initialization and build messages */
  58 #define dbg_bld(fmt, ...) ubi_dbg_msg("bld", fmt, ##__VA_ARGS__)
  59
  60 void ubi_dump_vol_info(const struct ubi_volume *vol);
  61 void ubi_dump_vtbl_record(const struct ubi_vtbl_record *r, int idx);
  62 void ubi_dump_av(const struct ubi_ainf_volume *av);
  63 void ubi_dump_aeb(const struct ubi_ainf_peb *aeb, int type);
  64 void ubi_dump_mkvol_req(const struct ubi_mkvol_req *req);
  65 int ubi_self_check_all_ff(struct ubi_device *ubi, int pnum, int offset,
  66                           int len);
  67 int ubi_debugging_init_dev(struct ubi_device *ubi);
  68 void ubi_debugging_exit_dev(struct ubi_device *ubi);
  69 int ubi_debugfs_init(void);
  70 void ubi_debugfs_exit(void);
  71 int ubi_debugfs_init_dev(struct ubi_device *ubi);
  72 void ubi_debugfs_exit_dev(struct ubi_device *ubi);
  73
  74 /*
  75  * The UBI debugfs directory name pattern and maximum name length (3 for "ubi"
  76  * + 2 for the number plus 1 for the trailing zero byte.
  77  */
  78 #define UBI_DFS_DIR_NAME "ubi%d"
  79 #define UBI_DFS_DIR_LEN  (3 + 2 + 1)
  80
  81 /**
  82  * struct ubi_debug_info - debugging information for an UBI device.
  83  *
  84  * @chk_gen: if UBI general extra checks are enabled
  85  * @chk_io: if UBI I/O extra checks are enabled
  86  * @disable_bgt: disable the background task for testing purposes
  87  * @emulate_bitflips: emulate bit-flips for testing purposes
  88  * @emulate_io_failures: emulate write/erase failures for testing purposes
  89  * @dfs_dir_name: name of debugfs directory containing files of this UBI device
  90  * @dfs_dir: direntry object of the UBI device debugfs directory
  91  * @dfs_chk_gen: debugfs knob to enable UBI general extra checks
  92  * @dfs_chk_io: debugfs knob to enable UBI I/O extra checks
  93  * @dfs_disable_bgt: debugfs knob to disable the background task
  94  * @dfs_emulate_bitflips: debugfs knob to emulate bit-flips
  95  * @dfs_emulate_io_failures: debugfs knob to emulate write/erase failures
  96  */
  97 struct ubi_debug_info {
  98         unsigned int chk_gen:1;
  99         unsigned int chk_io:1;
 100         unsigned int disable_bgt:1;
 101         unsigned int emulate_bitflips:1;
 102         unsigned int emulate_io_failures:1;
 103         char dfs_dir_name[UBI_DFS_DIR_LEN + 1];
 104         struct dentry *dfs_dir;
 105         struct dentry *dfs_chk_gen;
 106         struct dentry *dfs_chk_io;
 107         struct dentry *dfs_disable_bgt;
 108         struct dentry *dfs_emulate_bitflips;
 109         struct dentry *dfs_emulate_io_failures;
 110 };
 111
 112 /**
 113  * ubi_dbg_is_bgt_disabled - if the background thread is disabled.
 114  * @ubi: UBI device description object
 115  *
 116  * Returns non-zero if the UBI background thread is disabled for testing
 117  * purposes.
 118  */
 119 static inline int ubi_dbg_is_bgt_disabled(const struct ubi_device *ubi)
 120 {
 121         return ubi->dbg->disable_bgt;
 122 }
 123
 124 /**
 125  * ubi_dbg_is_bitflip - if it is time to emulate a bit-flip.
 126  * @ubi: UBI device description object
 127  *
 128  * Returns non-zero if a bit-flip should be emulated, otherwise returns zero.
 129  */
 130 static inline int ubi_dbg_is_bitflip(const struct ubi_device *ubi)
 131 {
 132         if (ubi->dbg->emulate_bitflips)
 133                 return !(random32() % 200);
 134         return 0;
 135 }
 136
 137 /**
 138  * ubi_dbg_is_write_failure - if it is time to emulate a write failure.
 139  * @ubi: UBI device description object
 140  *
 141  * Returns non-zero if a write failure should be emulated, otherwise returns
 142  * zero.
 143  */
 144 static inline int ubi_dbg_is_write_failure(const struct ubi_device *ubi)
 145 {
 146         if (ubi->dbg->emulate_io_failures)
 147                 return !(random32() % 500);
 148         return 0;
 149 }
 150
 151 /**
 152  * ubi_dbg_is_erase_failure - if its time to emulate an erase failure.
 153  * @ubi: UBI device description object
 154  *
 155  * Returns non-zero if an erase failure should be emulated, otherwise returns
 156  * zero.
 157  */
 158 static inline int ubi_dbg_is_erase_failure(const struct ubi_device *ubi)
 159 {
 160         if (ubi->dbg->emulate_io_failures)
 161                 return !(random32() % 400);
 162         return 0;
 163 }
 164
 165 #endif /* !__UBI_DEBUG_H__ */