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 dbg_err(fmt, ...) ubi_err(fmt, ##__VA_ARGS__)
  28
  29 #define ubi_assert(expr)  do {                                               \
  30         if (unlikely(!(expr))) {                                             \
  31                 printk(KERN_CRIT "UBI assert failed in %s at %u (pid %d)\n", \
  32                        __func__, __LINE__, current->pid);                    \
  33                 ubi_dbg_dump_stack();                                        \
  34         }                                                                    \
  35 } while (0)
  36
  37 #define dbg_msg(fmt, ...)                                    \
  38         printk(KERN_DEBUG "UBI DBG (pid %d): %s: " fmt "\n", \
  39                current->pid, __func__, ##__VA_ARGS__)
  40
  41 #define dbg_do_msg(typ, fmt, ...) do {                       \
  42         if (ubi_msg_flags & typ)                             \
  43                 dbg_msg(fmt, ##__VA_ARGS__);                 \
  44 } while (0)
  45
  46 #define ubi_dbg_dump_stack() dump_stack()
  47
  48 struct ubi_ec_hdr;
  49 struct ubi_vid_hdr;
  50 struct ubi_volume;
  51 struct ubi_vtbl_record;
  52 struct ubi_scan_volume;
  53 struct ubi_scan_leb;
  54 struct ubi_mkvol_req;
  55
  56 void ubi_dbg_dump_ec_hdr(const struct ubi_ec_hdr *ec_hdr);
  57 void ubi_dbg_dump_vid_hdr(const struct ubi_vid_hdr *vid_hdr);
  58 void ubi_dbg_dump_vol_info(const struct ubi_volume *vol);
  59 void ubi_dbg_dump_vtbl_record(const struct ubi_vtbl_record *r, int idx);
  60 void ubi_dbg_dump_sv(const struct ubi_scan_volume *sv);
  61 void ubi_dbg_dump_seb(const struct ubi_scan_leb *seb, int type);
  62 void ubi_dbg_dump_mkvol_req(const struct ubi_mkvol_req *req);
  63 void ubi_dbg_dump_flash(struct ubi_device *ubi, int pnum, int offset, int len);
  64
  65 extern unsigned int ubi_msg_flags;
  66
  67 /*
  68  * Debugging message type flags (must match msg_type_names in debug.c).
  69  *
  70  * UBI_MSG_GEN: general messages
  71  * UBI_MSG_EBA: journal messages
  72  * UBI_MSG_WL: mount messages
  73  * UBI_MSG_IO: commit messages
  74  * UBI_MSG_BLD: LEB find messages
  75  */
  76 enum {
  77         UBI_MSG_GEN  = 0x1,
  78         UBI_MSG_EBA  = 0x2,
  79         UBI_MSG_WL   = 0x4,
  80         UBI_MSG_IO   = 0x8,
  81         UBI_MSG_BLD  = 0x10,
  82 };
  83
  84 #define ubi_dbg_print_hex_dump(l, ps, pt, r, g, b, len, a)  \
  85                 print_hex_dump(l, ps, pt, r, g, b, len, a)
  86
  87 /* General debugging messages */
  88 #define dbg_gen(fmt, ...) dbg_do_msg(UBI_MSG_GEN, fmt, ##__VA_ARGS__)
  89
  90 /* Messages from the eraseblock association sub-system */
  91 #define dbg_eba(fmt, ...) dbg_do_msg(UBI_MSG_EBA, fmt, ##__VA_ARGS__)
  92
  93 /* Messages from the wear-leveling sub-system */
  94 #define dbg_wl(fmt, ...) dbg_do_msg(UBI_MSG_WL, fmt, ##__VA_ARGS__)
  95
  96 /* Messages from the input/output sub-system */
  97 #define dbg_io(fmt, ...) dbg_do_msg(UBI_MSG_IO, fmt, ##__VA_ARGS__)
  98
  99 /* Initialization and build messages */
 100 #define dbg_bld(fmt, ...) dbg_do_msg(UBI_MSG_BLD, fmt, ##__VA_ARGS__)
 101
 102 extern unsigned int ubi_chk_flags;
 103
 104 /*
 105  * Debugging check flags.
 106  *
 107  * UBI_CHK_GEN: general checks
 108  * UBI_CHK_IO: check writes and erases
 109  */
 110 enum {
 111         UBI_CHK_GEN = 0x1,
 112         UBI_CHK_IO  = 0x2,
 113 };
 114
 115 int ubi_dbg_check_all_ff(struct ubi_device *ubi, int pnum, int offset, int len);
 116 int ubi_dbg_check_write(struct ubi_device *ubi, const void *buf, int pnum,
 117                         int offset, int len);
 118
 119 extern unsigned int ubi_tst_flags;
 120
 121 /*
 122  * Special testing flags.
 123  *
 124  * UBIFS_TST_DISABLE_BGT: disable the background thread
 125  * UBI_TST_EMULATE_BITFLIPS: emulate bit-flips
 126  * UBI_TST_EMULATE_WRITE_FAILURES: emulate write failures
 127  * UBI_TST_EMULATE_ERASE_FAILURES: emulate erase failures
 128  */
 129 enum {
 130         UBI_TST_DISABLE_BGT            = 0x1,
 131         UBI_TST_EMULATE_BITFLIPS       = 0x2,
 132         UBI_TST_EMULATE_WRITE_FAILURES = 0x4,
 133         UBI_TST_EMULATE_ERASE_FAILURES = 0x8,
 134 };
 135
 136 /**
 137  * ubi_dbg_is_bgt_disabled - if the background thread is disabled.
 138  *
 139  * Returns non-zero if the UBI background thread is disabled for testing
 140  * purposes.
 141  */
 142 static inline int ubi_dbg_is_bgt_disabled(void)
 143 {
 144         return ubi_tst_flags & UBI_TST_DISABLE_BGT;
 145 }
 146
 147 /**
 148  * ubi_dbg_is_bitflip - if it is time to emulate a bit-flip.
 149  *
 150  * Returns non-zero if a bit-flip should be emulated, otherwise returns zero.
 151  */
 152 static inline int ubi_dbg_is_bitflip(void)
 153 {
 154         if (ubi_tst_flags & UBI_TST_EMULATE_BITFLIPS)
 155                 return !(random32() % 200);
 156         return 0;
 157 }
 158
 159 /**
 160  * ubi_dbg_is_write_failure - if it is time to emulate a write failure.
 161  *
 162  * Returns non-zero if a write failure should be emulated, otherwise returns
 163  * zero.
 164  */
 165 static inline int ubi_dbg_is_write_failure(void)
 166 {
 167         if (ubi_tst_flags & UBI_TST_EMULATE_WRITE_FAILURES)
 168                 return !(random32() % 500);
 169         return 0;
 170 }
 171
 172 /**
 173  * ubi_dbg_is_erase_failure - if its time to emulate an erase failure.
 174  *
 175  * Returns non-zero if an erase failure should be emulated, otherwise returns
 176  * zero.
 177  */
 178 static inline int ubi_dbg_is_erase_failure(void)
 179 {
 180         if (ubi_tst_flags & UBI_TST_EMULATE_ERASE_FAILURES)
 181                 return !(random32() % 400);
 182         return 0;
 183 }
 184
 185 #else
 186
 187 #define ubi_assert(expr)                 ({})
 188 #define dbg_err(fmt, ...)                ({})
 189 #define dbg_msg(fmt, ...)                ({})
 190 #define dbg_gen(fmt, ...)                ({})
 191 #define dbg_eba(fmt, ...)                ({})
 192 #define dbg_wl(fmt, ...)                 ({})
 193 #define dbg_io(fmt, ...)                 ({})
 194 #define dbg_bld(fmt, ...)                ({})
 195 #define ubi_dbg_dump_stack()             ({})
 196 #define ubi_dbg_dump_ec_hdr(ec_hdr)      ({})
 197 #define ubi_dbg_dump_vid_hdr(vid_hdr)    ({})
 198 #define ubi_dbg_dump_vol_info(vol)       ({})
 199 #define ubi_dbg_dump_vtbl_record(r, idx) ({})
 200 #define ubi_dbg_dump_sv(sv)              ({})
 201 #define ubi_dbg_dump_seb(seb, type)      ({})
 202 #define ubi_dbg_dump_mkvol_req(req)      ({})
 203 #define ubi_dbg_dump_flash(ubi, pnum, offset, len) ({})
 204 #define ubi_dbg_print_hex_dump(l, ps, pt, r, g, b, len, a)  ({})
 205
 206 #define ubi_dbg_is_bgt_disabled()  0
 207 #define ubi_dbg_is_bitflip()       0
 208 #define ubi_dbg_is_write_failure() 0
 209 #define ubi_dbg_is_erase_failure() 0
 210 #define ubi_dbg_check_all_ff(ubi, pnum, offset, len) 0
 211 #define ubi_dbg_check_write(ubi, buf, pnum, offset, len) 0
 212
 213 #endif /* !CONFIG_MTD_UBI_DEBUG */
 214 #endif /* !__UBI_DEBUG_H__ */