LXR linux/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 */
  24typedef struct ktrace_entry {
  25        void    *val[16];
  26} ktrace_entry_t;
  27
  28/*
  29 * Trace buffer header structure.
  30 */
  31typedef 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 */
  42typedef 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
  50extern void ktrace_init(int zentries);
  51extern void ktrace_uninit(void);
  52
  53extern ktrace_t *ktrace_alloc(int, unsigned int __nocast);
  54extern void ktrace_free(ktrace_t *);
  55
  56extern 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
  75extern ktrace_entry_t   *ktrace_first(ktrace_t *, ktrace_snap_t *);
  76extern int              ktrace_nentries(ktrace_t *);
  77extern ktrace_entry_t   *ktrace_next(ktrace_t *, ktrace_snap_t *);
  78extern 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__ */
  86