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_debugfs_init(void);
  64 void ubi_debugfs_exit(void);
  65 int ubi_debugfs_init_dev(struct ubi_device *ubi);
  66 void ubi_debugfs_exit_dev(struct ubi_device *ubi);
  67
  68 /**
  69  * ubi_dbg_is_bgt_disabled - if the background thread is disabled.
  70  * @ubi: UBI device description object
  71  *
  72  * Returns non-zero if the UBI background thread is disabled for testing
  73  * purposes.
  74  */
  75 static inline int ubi_dbg_is_bgt_disabled(const struct ubi_device *ubi)
  76 {
  77         return ubi->dbg.disable_bgt;
  78 }
  79
  80 /**
  81  * ubi_dbg_is_bitflip - if it is time to emulate a bit-flip.
  82  * @ubi: UBI device description object
  83  *
  84  * Returns non-zero if a bit-flip should be emulated, otherwise returns zero.
  85  */
  86 static inline int ubi_dbg_is_bitflip(const struct ubi_device *ubi)
  87 {
  88         if (ubi->dbg.emulate_bitflips)
  89                 return !(prandom_u32() % 200);
  90         return 0;
  91 }
  92
  93 /**
  94  * ubi_dbg_is_write_failure - if it is time to emulate a write failure.
  95  * @ubi: UBI device description object
  96  *
  97  * Returns non-zero if a write failure should be emulated, otherwise returns
  98  * zero.
  99  */
 100 static inline int ubi_dbg_is_write_failure(const struct ubi_device *ubi)
 101 {
 102         if (ubi->dbg.emulate_io_failures)
 103                 return !(prandom_u32() % 500);
 104         return 0;
 105 }
 106
 107 /**
 108  * ubi_dbg_is_erase_failure - if its time to emulate an erase failure.
 109  * @ubi: UBI device description object
 110  *
 111  * Returns non-zero if an erase failure should be emulated, otherwise returns
 112  * zero.
 113  */
 114 static inline int ubi_dbg_is_erase_failure(const struct ubi_device *ubi)
 115 {
 116         if (ubi->dbg.emulate_io_failures)
 117                 return !(prandom_u32() % 400);
 118         return 0;
 119 }
 120
 121 static inline int ubi_dbg_chk_io(const struct ubi_device *ubi)
 122 {
 123         return ubi->dbg.chk_io;
 124 }
 125
 126 static inline int ubi_dbg_chk_gen(const struct ubi_device *ubi)
 127 {
 128         return ubi->dbg.chk_gen;
 129 }
 130 #endif /* !__UBI_DEBUG_H__ */