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 /*
  22  * Trace buffer entry structure.
  23  */
  24 typedef struct ktrace_entry {
  25         void    *val[16];
  26 } ktrace_entry_t;
  27
  28 /*
  29  * Trace buffer header structure.
  30  */
  31 typedef struct ktrace {
  32         int             kt_nentries;    /* number of entries in trace buf */
  33         atomic_t        kt_index;       /* current index in entries */
  34         unsigned int    kt_index_mask;
  35         int             kt_rollover;
  36         ktrace_entry_t  *kt_entries;    /* buffer of entries */
  37 } ktrace_t;
  38
  39 /*
  40  * Trace buffer snapshot structure.
  41  */
  42 typedef struct ktrace_snap {
  43         int             ks_start;       /* kt_index at time of snap */
  44         int             ks_index;       /* current index */
  45 } ktrace_snap_t;
  46
  47
  48 #ifdef CONFIG_XFS_TRACE
  49
  50 extern void ktrace_init(int zentries);
  51 extern void ktrace_uninit(void);
  52
  53 extern ktrace_t *ktrace_alloc(int, unsigned int __nocast);
  54 extern void ktrace_free(ktrace_t *);
  55
  56 extern void ktrace_enter(
  57         ktrace_t        *,
  58         void            *,
  59         void            *,
  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
  75 extern ktrace_entry_t   *ktrace_first(ktrace_t *, ktrace_snap_t *);
  76 extern int              ktrace_nentries(ktrace_t *);
  77 extern ktrace_entry_t   *ktrace_next(ktrace_t *, ktrace_snap_t *);
  78 extern ktrace_entry_t   *ktrace_skip(ktrace_t *, int, ktrace_snap_t *);
  79
  80 #else
  81 #define ktrace_init(x)  do { } while (0)
  82 #define ktrace_uninit() do { } while (0)
  83 #endif  /* CONFIG_XFS_TRACE */
  84
  85 #endif  /* __XFS_SUPPORT_KTRACE_H__ */