fs/xfs/support/ktrace.h

   1 /*
   2  * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * 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 the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #ifndef __XFS_SUPPORT_KTRACE_H__
  19 #define __XFS_SUPPORT_KTRACE_H__
  20
  21 #include <spin.h>
  22
  23 /*
  24  * Trace buffer entry structure.
  25  */
  26 typedef struct ktrace_entry {
  27         void    *val[16];
  28 } ktrace_entry_t;
  29
  30 /*
  31  * Trace buffer header structure.
  32  */
  33 typedef struct ktrace {
  34         lock_t          kt_lock;        /* mutex to guard counters */
  35         int             kt_nentries;    /* number of entries in trace buf */
  36         int             kt_index;       /* current index in entries */
  37         int             kt_rollover;
  38         ktrace_entry_t  *kt_entries;    /* buffer of entries */
  39 } ktrace_t;
  40
  41 /*
  42  * Trace buffer snapshot structure.
  43  */
  44 typedef struct ktrace_snap {
  45         int             ks_start;       /* kt_index at time of snap */
  46         int             ks_index;       /* current index */
  47 } ktrace_snap_t;
  48
  49
  50 #ifdef CONFIG_XFS_TRACE
  51
  52 extern void ktrace_init(int zentries);
  53 extern void ktrace_uninit(void);
  54
  55 extern ktrace_t *ktrace_alloc(int, unsigned int __nocast);
  56 extern void ktrace_free(ktrace_t *);
  57
  58 extern void ktrace_enter(
  59         ktrace_t        *,
  60         void            *,
  61         void            *,
  62         void            *,
  63         void            *,
  64         void            *,
  65         void            *,
  66         void            *,
  67         void            *,
  68         void            *,
  69         void            *,
  70         void            *,
  71         void            *,
  72         void            *,
  73         void            *,
  74         void            *,
  75         void            *);
  76
  77 extern ktrace_entry_t   *ktrace_first(ktrace_t *, ktrace_snap_t *);
  78 extern int              ktrace_nentries(ktrace_t *);
  79 extern ktrace_entry_t   *ktrace_next(ktrace_t *, ktrace_snap_t *);
  80 extern ktrace_entry_t   *ktrace_skip(ktrace_t *, int, ktrace_snap_t *);
  81
  82 #else
  83 #define ktrace_init(x)  do { } while (0)
  84 #define ktrace_uninit() do { } while (0)
  85 #endif  /* CONFIG_XFS_TRACE */
  86
  87 #endif  /* __XFS_SUPPORT_KTRACE_H__ */