include/lttng-kernel.h

   1 /*
   2  * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
   3  *                      Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   4  *                      David Goulet <david.goulet@polymtl.ca>
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version 2
   9  * of the License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  19  */
  20
  21 #ifndef _LTTNG_KERNEL_H
  22 #define _LTTNG_KERNEL_H
  23
  24 #include "lttng-share.h"
  25
  26 #define LTTNG_SYM_NAME_LEN  128
  27
  28 enum lttng_kernel_instrumentation {
  29         LTTNG_KERNEL_TRACEPOINTS,
  30         LTTNG_KERNEL_KPROBES,
  31         LTTNG_KERNEL_FUNCTION_TRACER,
  32 };
  33
  34 /*
  35  * LTTng DebugFS ABI structures.
  36  */
  37
  38 struct lttng_kernel_channel {
  39         int overwrite;              /* 1: overwrite, 0: discard */
  40         uint64_t subbuf_size;           /* in bytes */
  41         uint64_t num_subbuf;
  42         unsigned int switch_timer_interval; /* usecs */
  43         unsigned int read_timer_interval;   /* usecs */
  44 };
  45
  46 struct lttng_kernel_tracepoint {
  47 };
  48
  49 /*
  50  * Either addr is used, or symbol_name and offset.
  51  */
  52 struct lttng_kernel_kprobe {
  53         uint64_t addr;
  54
  55         uint64_t offset;
  56         char symbol_name[LTTNG_SYM_NAME_LEN];
  57 };
  58
  59 struct lttng_kernel_function_tracer {
  60         char symbol_name[LTTNG_SYM_NAME_LEN];
  61 };
  62
  63 struct lttng_kernel_event {
  64         char name[LTTNG_SYM_NAME_LEN];  /* event name */
  65         enum lttng_kernel_instrumentation instrumentation;
  66         /* Per instrumentation type configuration */
  67         union {
  68                 struct lttng_kernel_tracepoint tracepoint;
  69                 struct lttng_kernel_kprobe kprobe;
  70                 struct lttng_kernel_function_tracer ftrace;
  71         } u;
  72 };
  73
  74 struct lttng_kernel_tracer_version {
  75         uint32_t version;
  76         uint32_t patchlevel;
  77         uint32_t sublevel;
  78 };
  79
  80 #endif /* _LTTNG_KERNEL_H */