sys/sys/ktr.h

   1 /*
   2  * Copyright (c) 2005 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $DragonFly: src/sys/sys/ktr.h,v 1.12 2008/06/20 01:23:27 y0netan1 Exp $
  35  */
  36 /*
  37  * Generic Kernel trace buffer support.
  38  *
  39  */
  40
  41 #ifndef _SYS_KTR_H_
  42 #define _SYS_KTR_H_
  43
  44 #ifndef _SYS_TYPES_H_
  45 #include <sys/types.h>
  46 #endif
  47 #ifndef _SYS_SYSCTL_H_
  48 #include <sys/sysctl.h>
  49 #endif
  50
  51 #ifdef _KERNEL
  52 #include "opt_ktr.h"
  53 #endif
  54
  55 /*
  56  * Conveniently auto-enable KTRs when particular KTRs are specified
  57  * in kernel options.  This way we can get logging during boot.
  58  * However, if KTR_ALL is optioned, just disable everything by default.
  59  * The user can enable individual masks via sysctl.
  60  */
  61 #if defined(KTR_ALL)
  62 #define KTR_AUTO_ENABLE 0
  63 #else
  64 #define KTR_ALL         0
  65 #define KTR_AUTO_ENABLE -1
  66 #endif
  67
  68 #define KTR_BUFSIZE     48
  69 #define KTR_VERSION     3
  70
  71 #ifndef LOCORE
  72
  73 struct ktr_info {
  74         const char *kf_name;    /* human-interpreted subsystem name */
  75         int32_t *kf_master_enable; /* the master enable variable */
  76         const char *kf_format;  /* data format */
  77         int kf_data_size;       /* relevance of the data buffer */
  78 };
  79
  80 struct ktr_entry {
  81         u_int64_t ktr_timestamp;
  82         struct ktr_info *ktr_info;
  83         const   char *ktr_file;
  84         void    *ktr_caller1;
  85         void    *ktr_caller2;
  86         int32_t ktr_line;
  87         int32_t ktr_unused;
  88         int32_t ktr_data[KTR_BUFSIZE / sizeof(int32_t)];
  89 };
  90
  91 void    ktr_log(struct ktr_info *info, const char *file, int line, ...);
  92 void    ktr_log_ptr(struct ktr_info *info, const char *file, int line, const void *ptr);
  93 void    cpu_ktr_caller(struct ktr_entry *ktr);
  94
  95 /*
  96  * Take advantage of constant integer optimizations by the compiler
  97  * to optimize-out disabled code at compile-time.  If KTR_ENABLE_<name>
  98  * is 0, the compiler avoids generating all related code when KTR is enabled.
  99  */
 100
 101 #ifdef KTR
 102
 103 SYSCTL_DECL(_debug_ktr);
 104
 105 #define KTR_INFO_MASTER(master)                                             \
 106             SYSCTL_NODE(_debug_ktr, OID_AUTO, master, CTLFLAG_RW, 0, "");   \
 107             int ktr_ ## master ## _enable = KTR_AUTO_ENABLE;                \
 108             SYSCTL_INT(_debug_ktr, OID_AUTO, master ## _enable, CTLFLAG_RW, \
 109                         &ktr_ ## master ## _enable, 0, "")
 110
 111 #define KTR_INFO_MASTER_EXTERN(master)                                  \
 112             SYSCTL_DECL(_debug_ktr_ ## master);                         \
 113             extern int ktr_ ## master ## _enable                        \
 114
 115 /*
 116  * This creates a read-only sysctl so the user knows what the mask
 117  * definitions are and a number of static const int's which are used
 118  * by the compiler to optimize the trace logging at compile-time and
 119  * run-time.
 120  */
 121 #define KTR_INFO(compile, master, name, maskbit, format, datasize)      \
 122             static const int ktr_ ## master ## _ ## name ## _mask =     \
 123                 1 << maskbit;                                           \
 124             static const int ktr_ ## master ## _ ## name ## _enable =   \
 125                 compile;                                                \
 126             static int ktr_ ## master ## _ ## name ## _mask_ro =        \
 127                 1 << maskbit;                                           \
 128             SYSCTL_INT(_debug_ktr_ ## master, OID_AUTO, name ## _mask,  \
 129                 CTLFLAG_RD, &ktr_ ## master ## _ ## name ## _mask_ro,   \
 130                 0, "");                                                 \
 131             static struct ktr_info ktr_info_ ## master ## _ ## name = { \
 132                 #master "_" #name,                                      \
 133                 &ktr_ ## master ## _enable,                             \
 134                 format,                                                 \
 135                 datasize }
 136
 137 #define KTR_LOG(name, args...)                                          \
 138             if (ktr_ ## name ## _enable &&                              \
 139               (ktr_ ## name ## _mask & *ktr_info_ ## name .kf_master_enable)) \
 140             ktr_log(&ktr_info_ ## name, __FILE__, __LINE__, ##args)
 141
 142 #define KTR_LOG_PTR(name, ptr)                                          \
 143             if (ktr_ ## name ## _enable &&                              \
 144               (ktr_ ## name ## _mask & *ktr_info_ ## name .kf_master_enable)) \
 145             ktr_log_ptr(&ktr_info_ ## name, __FILE__, __LINE__, ptr)
 146
 147 #else
 148
 149 #define KTR_INFO_MASTER(master)                                         \
 150             const static int ktr_ ## master ## _enable = 0
 151
 152 #define KTR_INFO_MASTER_EXTERN(master)                                  \
 153             const static int ktr_ ## master ## _enable
 154
 155 #define KTR_INFO(compile, master, name, maskbit, format, datasize)      \
 156             static const int ktr_ ## master ## _ ## name ## _mask =     \
 157                 1 << maskbit
 158
 159 #define KTR_LOG(info, args...)
 160 #define KTR_LOG_PTR(info, ptr)
 161
 162 #endif
 163
 164 #endif /* !LOCORE */
 165 #endif /* !_SYS_KTR_H_ */