Fix: test_utils_expand_path passes NULL to sprintf
[lttng-tools.git] / src / common / 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 modify
7 * it under the terms of the GNU General Public License, version 2 only,
8 * as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 */
19
20 #ifndef _LTTNG_KERNEL_H
21 #define _LTTNG_KERNEL_H
22
23 #include <stdint.h>
24 #include <common/macros.h>
25
26 #define LTTNG_KERNEL_SYM_NAME_LEN 256
27
28 /*
29 * LTTng DebugFS ABI structures.
30 *
31 * This is the kernel ABI copied from lttng-modules tree.
32 */
33
34 enum lttng_kernel_instrumentation {
35 LTTNG_KERNEL_ALL = -1, /* Used within lttng-tools */
36 LTTNG_KERNEL_TRACEPOINT = 0,
37 LTTNG_KERNEL_KPROBE = 1,
38 LTTNG_KERNEL_FUNCTION = 2,
39 LTTNG_KERNEL_KRETPROBE = 3,
40 LTTNG_KERNEL_NOOP = 4, /* not hooked */
41 LTTNG_KERNEL_SYSCALL = 5,
42 };
43
44 enum lttng_kernel_context_type {
45 LTTNG_KERNEL_CONTEXT_PID = 0,
46 LTTNG_KERNEL_CONTEXT_PERF_CPU_COUNTER = 1,
47 LTTNG_KERNEL_CONTEXT_PROCNAME = 2,
48 LTTNG_KERNEL_CONTEXT_PRIO = 3,
49 LTTNG_KERNEL_CONTEXT_NICE = 4,
50 LTTNG_KERNEL_CONTEXT_VPID = 5,
51 LTTNG_KERNEL_CONTEXT_TID = 6,
52 LTTNG_KERNEL_CONTEXT_VTID = 7,
53 LTTNG_KERNEL_CONTEXT_PPID = 8,
54 LTTNG_KERNEL_CONTEXT_VPPID = 9,
55 LTTNG_KERNEL_CONTEXT_HOSTNAME = 10,
56 LTTNG_KERNEL_CONTEXT_CPU_ID = 11,
57 LTTNG_KERNEL_CONTEXT_INTERRUPTIBLE = 12,
58 LTTNG_KERNEL_CONTEXT_PREEMPTIBLE = 13,
59 LTTNG_KERNEL_CONTEXT_NEED_RESCHEDULE = 14,
60 LTTNG_KERNEL_CONTEXT_MIGRATABLE = 15,
61 };
62
63 /* Perf counter attributes */
64 struct lttng_kernel_perf_counter_ctx {
65 uint32_t type;
66 uint64_t config;
67 char name[LTTNG_KERNEL_SYM_NAME_LEN];
68 } LTTNG_PACKED;
69
70 /* Event/Channel context */
71 #define LTTNG_KERNEL_CONTEXT_PADDING1 16
72 #define LTTNG_KERNEL_CONTEXT_PADDING2 LTTNG_KERNEL_SYM_NAME_LEN + 32
73 struct lttng_kernel_context {
74 enum lttng_kernel_context_type ctx;
75 char padding[LTTNG_KERNEL_CONTEXT_PADDING1];
76
77 union {
78 struct lttng_kernel_perf_counter_ctx perf_counter;
79 char padding[LTTNG_KERNEL_CONTEXT_PADDING2];
80 } u;
81 } LTTNG_PACKED;
82
83 struct lttng_kernel_kretprobe {
84 uint64_t addr;
85
86 uint64_t offset;
87 char symbol_name[LTTNG_KERNEL_SYM_NAME_LEN];
88 } LTTNG_PACKED;
89
90 /*
91 * Either addr is used, or symbol_name and offset.
92 */
93 struct lttng_kernel_kprobe {
94 uint64_t addr;
95
96 uint64_t offset;
97 char symbol_name[LTTNG_KERNEL_SYM_NAME_LEN];
98 } LTTNG_PACKED;
99
100 /* Function tracer */
101 struct lttng_kernel_function {
102 char symbol_name[LTTNG_KERNEL_SYM_NAME_LEN];
103 } LTTNG_PACKED;
104
105 #define LTTNG_KERNEL_EVENT_PADDING1 16
106 #define LTTNG_KERNEL_EVENT_PADDING2 LTTNG_KERNEL_SYM_NAME_LEN + 32
107 struct lttng_kernel_event {
108 char name[LTTNG_KERNEL_SYM_NAME_LEN];
109 enum lttng_kernel_instrumentation instrumentation;
110 char padding[LTTNG_KERNEL_EVENT_PADDING1];
111
112 /* Per instrumentation type configuration */
113 union {
114 struct lttng_kernel_kretprobe kretprobe;
115 struct lttng_kernel_kprobe kprobe;
116 struct lttng_kernel_function ftrace;
117 char padding[LTTNG_KERNEL_EVENT_PADDING2];
118 } u;
119 } LTTNG_PACKED;
120
121 struct lttng_kernel_tracer_version {
122 uint32_t major;
123 uint32_t minor;
124 uint32_t patchlevel;
125 } LTTNG_PACKED;
126
127 struct lttng_kernel_tracer_abi_version {
128 uint32_t major;
129 uint32_t minor;
130 } LTTNG_PACKED;
131
132 struct lttng_kernel_syscall_mask {
133 uint32_t len; /* in bits */
134 char mask[];
135 } LTTNG_PACKED;
136
137 /*
138 * kernel channel
139 */
140 #define LTTNG_KERNEL_CHANNEL_PADDING1 LTTNG_SYMBOL_NAME_LEN + 32
141 struct lttng_kernel_channel {
142 uint64_t subbuf_size; /* bytes */
143 uint64_t num_subbuf; /* power of 2 */
144 unsigned int switch_timer_interval; /* usec */
145 unsigned int read_timer_interval; /* usec */
146 enum lttng_event_output output; /* splice, mmap */
147
148 int overwrite; /* 1: overwrite, 0: discard */
149 char padding[LTTNG_KERNEL_CHANNEL_PADDING1];
150 } LTTNG_PACKED;
151
152 #define KERNEL_FILTER_BYTECODE_MAX_LEN 65536
153 struct lttng_kernel_filter_bytecode {
154 uint32_t len;
155 uint32_t reloc_offset;
156 uint64_t seqnum;
157 char data[0];
158 } LTTNG_PACKED;
159
160 #endif /* _LTTNG_KERNEL_H */
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