fs/xfs/support/ktrace.h

   1 /*
   2  * Copyright (c) 2000-2003 Silicon Graphics, Inc.  All Rights Reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it would be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  11  *
  12  * Further, this software is distributed without any warranty that it is
  13  * free of the rightful claim of any third person regarding infringement
  14  * or the like.  Any license provided herein, whether implied or
  15  * otherwise, applies only to this software file.  Patent licenses, if
  16  * any, provided herein do not apply to combinations of this program with
  17  * other software, or any other product whatsoever.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write the Free Software Foundation, Inc., 59
  21  * Temple Place - Suite 330, Boston MA 02111-1307, USA.
  22  *
  23  * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
  24  * Mountain View, CA  94043, or:
  25  *
  26  * http://www.sgi.com
  27  *
  28  * For further information regarding this notice, see:
  29  *
  30  * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
  31  */
  32 #ifndef __XFS_SUPPORT_KTRACE_H__
  33 #define __XFS_SUPPORT_KTRACE_H__
  34
  35 #include <spin.h>
  36
  37 /*
  38  * Trace buffer entry structure.
  39  */
  40 typedef struct ktrace_entry {
  41         void    *val[16];
  42 } ktrace_entry_t;
  43
  44 /*
  45  * Trace buffer header structure.
  46  */
  47 typedef struct ktrace {
  48         lock_t          kt_lock;        /* mutex to guard counters */
  49         int             kt_nentries;    /* number of entries in trace buf */
  50         int             kt_index;       /* current index in entries */
  51         int             kt_rollover;
  52         ktrace_entry_t  *kt_entries;    /* buffer of entries */
  53 } ktrace_t;
  54
  55 /*
  56  * Trace buffer snapshot structure.
  57  */
  58 typedef struct ktrace_snap {
  59         int             ks_start;       /* kt_index at time of snap */
  60         int             ks_index;       /* current index */
  61 } ktrace_snap_t;
  62
  63
  64 #ifdef CONFIG_XFS_TRACE
  65
  66 extern void ktrace_init(int zentries);
  67 extern void ktrace_uninit(void);
  68
  69 extern ktrace_t *ktrace_alloc(int, int);
  70 extern void ktrace_free(ktrace_t *);
  71
  72 extern void ktrace_enter(
  73         ktrace_t        *,
  74         void            *,
  75         void            *,
  76         void            *,
  77         void            *,
  78         void            *,
  79         void            *,
  80         void            *,
  81         void            *,
  82         void            *,
  83         void            *,
  84         void            *,
  85         void            *,
  86         void            *,
  87         void            *,
  88         void            *,
  89         void            *);
  90
  91 extern ktrace_entry_t   *ktrace_first(ktrace_t *, ktrace_snap_t *);
  92 extern int              ktrace_nentries(ktrace_t *);
  93 extern ktrace_entry_t   *ktrace_next(ktrace_t *, ktrace_snap_t *);
  94 extern ktrace_entry_t   *ktrace_skip(ktrace_t *, int, ktrace_snap_t *);
  95
  96 #else
  97 #define ktrace_init(x)  do { } while (0)
  98 #define ktrace_uninit() do { } while (0)
  99 #endif  /* CONFIG_XFS_TRACE */
 100
 101 #endif  /* __XFS_SUPPORT_KTRACE_H__ */