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; only version 2
   9  * of the License.
  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 <stdint.h>
  25
  26 #include <lttng-share.h>
  27
  28 #define LTTNG_SYM_NAME_LEN  128
  29
  30 /*
  31  * LTTng DebugFS ABI structures.
  32  *
  33  * This is the kernel ABI copied from lttng-modules tree.
  34  */
  35
  36 enum lttng_kernel_instrumentation {
  37         LTTNG_KERNEL_TRACEPOINT    = 0,
  38         LTTNG_KERNEL_KPROBE        = 1,
  39         LTTNG_KERNEL_FUNCTION      = 2,
  40         LTTNG_KERNEL_KRETPROBE     = 3,
  41         LTTNG_KERNEL_NOOP          = 4,    /* not hooked */
  42         LTTNG_KERNEL_SYSCALL       = 5,
  43 };
  44
  45 enum lttng_kernel_context_type {
  46         LTTNG_KERNEL_CONTEXT_PID            = 0,
  47         LTTNG_KERNEL_CONTEXT_PERF_COUNTER   = 1,
  48         LTTNG_KERNEL_CONTEXT_COMM           = 2,
  49         LTTNG_KERNEL_CONTEXT_PRIO           = 3,
  50         LTTNG_KERNEL_CONTEXT_NICE           = 4,
  51         LTTNG_KERNEL_CONTEXT_VPID           = 5,
  52         LTTNG_KERNEL_CONTEXT_TID            = 6,
  53         LTTNG_KERNEL_CONTEXT_VTID           = 7,
  54         LTTNG_KERNEL_CONTEXT_PPID           = 8,
  55         LTTNG_KERNEL_CONTEXT_VPPID          = 9,
  56 };
  57
  58 /* Perf counter attributes */
  59 struct lttng_kernel_perf_counter_ctx {
  60         uint32_t type;
  61         uint64_t config;
  62         char name[LTTNG_SYM_NAME_LEN];
  63 };
  64
  65 /* Event/Channel context */
  66 struct lttng_kernel_context {
  67         enum lttng_kernel_context_type ctx;
  68         union {
  69                 struct lttng_kernel_perf_counter_ctx perf_counter;
  70         } u;
  71 };
  72
  73 struct lttng_kernel_kretprobe {
  74         uint64_t addr;
  75
  76         uint64_t offset;
  77         char symbol_name[LTTNG_SYM_NAME_LEN];
  78 };
  79
  80 /*
  81  * Either addr is used, or symbol_name and offset.
  82  */
  83 struct lttng_kernel_kprobe {
  84         uint64_t addr;
  85
  86         uint64_t offset;
  87         char symbol_name[LTTNG_SYM_NAME_LEN];
  88 };
  89
  90 /* Function tracer */
  91 struct lttng_kernel_function {
  92         char symbol_name[LTTNG_SYM_NAME_LEN];
  93 };
  94
  95 struct lttng_kernel_event {
  96         char name[LTTNG_SYM_NAME_LEN];
  97         enum lttng_kernel_instrumentation instrumentation;
  98         /* Per instrumentation type configuration */
  99         union {
 100                 struct lttng_kernel_kretprobe kretprobe;
 101                 struct lttng_kernel_kprobe kprobe;
 102                 struct lttng_kernel_function ftrace;
 103         } u;
 104 };
 105
 106 struct lttng_kernel_tracer_version {
 107         uint32_t version;
 108         uint32_t patchlevel;
 109         uint32_t sublevel;
 110 };
 111
 112 enum lttng_kernel_calibrate_type {
 113         LTTNG_KERNEL_CALIBRATE_KRETPROBE,
 114 };
 115
 116 struct lttng_kernel_calibrate {
 117         enum lttng_kernel_calibrate_type type;  /* type (input) */
 118 };
 119
 120 #endif /* _LTTNG_KERNEL_H */