lttng-abi.h

   1 /* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
   2  *
   3  * lttng-abi.h
   4  *
   5  * LTTng ABI header
   6  *
   7  * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   8  */
   9
  10 #ifndef _LTTNG_ABI_H
  11 #define _LTTNG_ABI_H
  12
  13 #include <linux/fs.h>
  14
  15 /*
  16  * Major/minor version of ABI exposed to lttng tools. Major number
  17  * should be increased when an incompatible ABI change is done.
  18  */
  19 #define LTTNG_MODULES_ABI_MAJOR_VERSION         2
  20 #define LTTNG_MODULES_ABI_MINOR_VERSION         5
  21
  22 #define LTTNG_KERNEL_SYM_NAME_LEN       256
  23 #define LTTNG_KERNEL_SESSION_NAME_LEN   256
  24 #define LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN  26
  25
  26 enum lttng_kernel_instrumentation {
  27         LTTNG_KERNEL_TRACEPOINT = 0,
  28         LTTNG_KERNEL_KPROBE     = 1,
  29         LTTNG_KERNEL_FUNCTION   = 2,
  30         LTTNG_KERNEL_KRETPROBE  = 3,
  31         LTTNG_KERNEL_NOOP       = 4,    /* not hooked */
  32         LTTNG_KERNEL_SYSCALL    = 5,
  33         LTTNG_KERNEL_UPROBE     = 6,
  34 };
  35
  36 /*
  37  * LTTng consumer mode
  38  */
  39 enum lttng_kernel_output {
  40         LTTNG_KERNEL_SPLICE     = 0,
  41         LTTNG_KERNEL_MMAP       = 1,
  42 };
  43
  44 /*
  45  * LTTng DebugFS ABI structures.
  46  */
  47 #define LTTNG_KERNEL_CHANNEL_PADDING    LTTNG_KERNEL_SYM_NAME_LEN + 32
  48 struct lttng_kernel_channel {
  49         uint64_t subbuf_size;                   /* in bytes */
  50         uint64_t num_subbuf;
  51         unsigned int switch_timer_interval;     /* usecs */
  52         unsigned int read_timer_interval;       /* usecs */
  53         enum lttng_kernel_output output;        /* splice, mmap */
  54         int overwrite;                          /* 1: overwrite, 0: discard */
  55         char padding[LTTNG_KERNEL_CHANNEL_PADDING];
  56 } __attribute__((packed));
  57
  58 struct lttng_kernel_kretprobe {
  59         uint64_t addr;
  60
  61         uint64_t offset;
  62         char symbol_name[LTTNG_KERNEL_SYM_NAME_LEN];
  63 } __attribute__((packed));
  64
  65 /*
  66  * Either addr is used, or symbol_name and offset.
  67  */
  68 struct lttng_kernel_kprobe {
  69         uint64_t addr;
  70
  71         uint64_t offset;
  72         char symbol_name[LTTNG_KERNEL_SYM_NAME_LEN];
  73 } __attribute__((packed));
  74
  75 struct lttng_kernel_function_tracer {
  76         char symbol_name[LTTNG_KERNEL_SYM_NAME_LEN];
  77 } __attribute__((packed));
  78
  79 struct lttng_kernel_uprobe {
  80         int fd;
  81 } __attribute__((packed));
  82
  83 struct lttng_kernel_event_callsite_uprobe {
  84         uint64_t offset;
  85 } __attribute__((packed));
  86
  87 struct lttng_kernel_event_callsite {
  88         union {
  89                 struct lttng_kernel_event_callsite_uprobe uprobe;
  90         } u;
  91 } __attribute__((packed));
  92
  93 enum lttng_kernel_syscall_entryexit {
  94         LTTNG_KERNEL_SYSCALL_ENTRYEXIT = 0,
  95         LTTNG_KERNEL_SYSCALL_ENTRY = 1,         /* Not implemented. */
  96         LTTNG_KERNEL_SYSCALL_EXIT = 2,          /* Not implemented. */
  97 };
  98
  99 enum lttng_kernel_syscall_abi {
 100         LTTNG_KERNEL_SYSCALL_ABI_ALL = 0,
 101         LTTNG_KERNEL_SYSCALL_ABI_NATIVE = 1,    /* Not implemented. */
 102         LTTNG_KERNEL_SYSCALL_ABI_COMPAT = 2,    /* Not implemented. */
 103 };
 104
 105 enum lttng_kernel_syscall_match {
 106         LTTNG_SYSCALL_MATCH_NAME = 0,
 107         LTTNG_SYSCALL_MATCH_NR = 1,             /* Not implemented. */
 108 };
 109
 110 struct lttng_kernel_syscall {
 111         uint8_t entryexit;      /* enum lttng_kernel_syscall_entryexit */
 112         uint8_t abi;            /* enum lttng_kernel_syscall_abi */
 113         uint8_t match;          /* enum lttng_kernel_syscall_match */
 114         uint8_t padding;
 115         uint32_t nr;            /* For LTTNG_SYSCALL_MATCH_NR */
 116 } __attribute__((packed));
 117
 118 /*
 119  * For syscall tracing, name = "*" means "enable all".
 120  */
 121 #define LTTNG_KERNEL_EVENT_PADDING1     16
 122 #define LTTNG_KERNEL_EVENT_PADDING2     LTTNG_KERNEL_SYM_NAME_LEN + 32
 123 struct lttng_kernel_event {
 124         char name[LTTNG_KERNEL_SYM_NAME_LEN];   /* event name */
 125         enum lttng_kernel_instrumentation instrumentation;
 126         char padding[LTTNG_KERNEL_EVENT_PADDING1];
 127
 128         /* Per instrumentation type configuration */
 129         union {
 130                 struct lttng_kernel_kretprobe kretprobe;
 131                 struct lttng_kernel_kprobe kprobe;
 132                 struct lttng_kernel_function_tracer ftrace;
 133                 struct lttng_kernel_uprobe uprobe;
 134                 struct lttng_kernel_syscall syscall;
 135                 char padding[LTTNG_KERNEL_EVENT_PADDING2];
 136         } u;
 137 } __attribute__((packed));
 138
 139 struct lttng_kernel_tracer_version {
 140         uint32_t major;
 141         uint32_t minor;
 142         uint32_t patchlevel;
 143 } __attribute__((packed));
 144
 145 struct lttng_kernel_tracer_abi_version {
 146         uint32_t major;
 147         uint32_t minor;
 148 } __attribute__((packed));
 149
 150 struct lttng_kernel_session_name {
 151         char name[LTTNG_KERNEL_SESSION_NAME_LEN];
 152 } __attribute__((packed));
 153
 154 struct lttng_kernel_session_creation_time {
 155         char iso8601[LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN];
 156 } __attribute__((packed));
 157
 158 enum lttng_kernel_calibrate_type {
 159         LTTNG_KERNEL_CALIBRATE_KRETPROBE,
 160 };
 161
 162 struct lttng_kernel_calibrate {
 163         enum lttng_kernel_calibrate_type type;  /* type (input) */
 164 } __attribute__((packed));
 165
 166 struct lttng_kernel_syscall_mask {
 167         uint32_t len;   /* in bits */
 168         char mask[];
 169 } __attribute__((packed));
 170
 171 enum lttng_kernel_context_type {
 172         LTTNG_KERNEL_CONTEXT_PID                = 0,
 173         LTTNG_KERNEL_CONTEXT_PERF_COUNTER       = 1,
 174         LTTNG_KERNEL_CONTEXT_PROCNAME           = 2,
 175         LTTNG_KERNEL_CONTEXT_PRIO               = 3,
 176         LTTNG_KERNEL_CONTEXT_NICE               = 4,
 177         LTTNG_KERNEL_CONTEXT_VPID               = 5,
 178         LTTNG_KERNEL_CONTEXT_TID                = 6,
 179         LTTNG_KERNEL_CONTEXT_VTID               = 7,
 180         LTTNG_KERNEL_CONTEXT_PPID               = 8,
 181         LTTNG_KERNEL_CONTEXT_VPPID              = 9,
 182         LTTNG_KERNEL_CONTEXT_HOSTNAME           = 10,
 183         LTTNG_KERNEL_CONTEXT_CPU_ID             = 11,
 184         LTTNG_KERNEL_CONTEXT_INTERRUPTIBLE      = 12,
 185         LTTNG_KERNEL_CONTEXT_PREEMPTIBLE        = 13,
 186         LTTNG_KERNEL_CONTEXT_NEED_RESCHEDULE    = 14,
 187         LTTNG_KERNEL_CONTEXT_MIGRATABLE         = 15,
 188         LTTNG_KERNEL_CONTEXT_CALLSTACK_KERNEL   = 16,
 189         LTTNG_KERNEL_CONTEXT_CALLSTACK_USER     = 17,
 190         LTTNG_KERNEL_CONTEXT_CGROUP_NS          = 18,
 191         LTTNG_KERNEL_CONTEXT_IPC_NS             = 19,
 192         LTTNG_KERNEL_CONTEXT_MNT_NS             = 20,
 193         LTTNG_KERNEL_CONTEXT_NET_NS             = 21,
 194         LTTNG_KERNEL_CONTEXT_PID_NS             = 22,
 195         LTTNG_KERNEL_CONTEXT_USER_NS            = 23,
 196         LTTNG_KERNEL_CONTEXT_UTS_NS             = 24,
 197         LTTNG_KERNEL_CONTEXT_UID                = 25,
 198         LTTNG_KERNEL_CONTEXT_EUID               = 26,
 199         LTTNG_KERNEL_CONTEXT_SUID               = 27,
 200         LTTNG_KERNEL_CONTEXT_GID                = 28,
 201         LTTNG_KERNEL_CONTEXT_EGID               = 29,
 202         LTTNG_KERNEL_CONTEXT_SGID               = 30,
 203         LTTNG_KERNEL_CONTEXT_VUID               = 31,
 204         LTTNG_KERNEL_CONTEXT_VEUID              = 32,
 205         LTTNG_KERNEL_CONTEXT_VSUID              = 33,
 206         LTTNG_KERNEL_CONTEXT_VGID               = 34,
 207         LTTNG_KERNEL_CONTEXT_VEGID              = 35,
 208         LTTNG_KERNEL_CONTEXT_VSGID              = 36,
 209 };
 210
 211 struct lttng_kernel_perf_counter_ctx {
 212         uint32_t type;
 213         uint64_t config;
 214         char name[LTTNG_KERNEL_SYM_NAME_LEN];
 215 } __attribute__((packed));
 216
 217 #define LTTNG_KERNEL_CONTEXT_PADDING1   16
 218 #define LTTNG_KERNEL_CONTEXT_PADDING2   LTTNG_KERNEL_SYM_NAME_LEN + 32
 219 struct lttng_kernel_context {
 220         enum lttng_kernel_context_type ctx;
 221         char padding[LTTNG_KERNEL_CONTEXT_PADDING1];
 222
 223         union {
 224                 struct lttng_kernel_perf_counter_ctx perf_counter;
 225                 char padding[LTTNG_KERNEL_CONTEXT_PADDING2];
 226         } u;
 227 } __attribute__((packed));
 228
 229 #define LTTNG_KERNEL_FILTER_BYTECODE_MAX_LEN            65536
 230 struct lttng_kernel_filter_bytecode {
 231         uint32_t len;
 232         uint32_t reloc_offset;
 233         uint64_t seqnum;
 234         char data[0];
 235 } __attribute__((packed));
 236
 237 enum lttng_kernel_tracker_type {
 238         LTTNG_KERNEL_TRACKER_UNKNOWN            = -1,
 239
 240         LTTNG_KERNEL_TRACKER_PID                = 0,
 241         LTTNG_KERNEL_TRACKER_VPID               = 1,
 242         LTTNG_KERNEL_TRACKER_UID                = 2,
 243         LTTNG_KERNEL_TRACKER_VUID               = 3,
 244         LTTNG_KERNEL_TRACKER_GID                = 4,
 245         LTTNG_KERNEL_TRACKER_VGID               = 5,
 246 };
 247
 248 struct lttng_kernel_tracker_args {
 249         enum lttng_kernel_tracker_type type;
 250         int32_t id;
 251 };
 252
 253 /* LTTng file descriptor ioctl */
 254 /* lttng-abi-old.h reserve 0x40, 0x41, 0x42, 0x43, and 0x44. */
 255 #define LTTNG_KERNEL_SESSION                    _IO(0xF6, 0x45)
 256 #define LTTNG_KERNEL_TRACER_VERSION             \
 257         _IOR(0xF6, 0x46, struct lttng_kernel_tracer_version)
 258 #define LTTNG_KERNEL_TRACEPOINT_LIST            _IO(0xF6, 0x47)
 259 #define LTTNG_KERNEL_WAIT_QUIESCENT             _IO(0xF6, 0x48)
 260 #define LTTNG_KERNEL_CALIBRATE                  \
 261         _IOWR(0xF6, 0x49, struct lttng_kernel_calibrate)
 262 #define LTTNG_KERNEL_SYSCALL_LIST               _IO(0xF6, 0x4A)
 263 #define LTTNG_KERNEL_TRACER_ABI_VERSION         \
 264         _IOR(0xF6, 0x4B, struct lttng_kernel_tracer_abi_version)
 265
 266 /* Session FD ioctl */
 267 /* lttng-abi-old.h reserve 0x50, 0x51, 0x52, and 0x53. */
 268 #define LTTNG_KERNEL_METADATA                   \
 269         _IOW(0xF6, 0x54, struct lttng_kernel_channel)
 270 #define LTTNG_KERNEL_CHANNEL                    \
 271         _IOW(0xF6, 0x55, struct lttng_kernel_channel)
 272 #define LTTNG_KERNEL_SESSION_START              _IO(0xF6, 0x56)
 273 #define LTTNG_KERNEL_SESSION_STOP               _IO(0xF6, 0x57)
 274 #define LTTNG_KERNEL_SESSION_TRACK_PID          \
 275         _IOR(0xF6, 0x58, int32_t)
 276 #define LTTNG_KERNEL_SESSION_UNTRACK_PID        \
 277         _IOR(0xF6, 0x59, int32_t)
 278
 279 /*
 280  * ioctl 0x58 and 0x59 are duplicated here. It works, since _IOR vs _IO
 281  * are generating two different ioctl numbers, but this was not done on
 282  * purpose. We should generally try to avoid those duplications.
 283  */
 284 #define LTTNG_KERNEL_SESSION_LIST_TRACKER_PIDS  _IO(0xF6, 0x58)
 285 #define LTTNG_KERNEL_SESSION_METADATA_REGEN     _IO(0xF6, 0x59)
 286
 287 /* lttng-abi-old.h reserve 0x5A and 0x5B. */
 288 #define LTTNG_KERNEL_SESSION_STATEDUMP          _IO(0xF6, 0x5C)
 289 #define LTTNG_KERNEL_SESSION_SET_NAME           \
 290         _IOR(0xF6, 0x5D, struct lttng_kernel_session_name)
 291 #define LTTNG_KERNEL_SESSION_SET_CREATION_TIME          \
 292         _IOR(0xF6, 0x5E, struct lttng_kernel_session_creation_time)
 293
 294 /* Channel FD ioctl */
 295 /* lttng-abi-old.h reserve 0x60 and 0x61. */
 296 #define LTTNG_KERNEL_STREAM                     _IO(0xF6, 0x62)
 297 #define LTTNG_KERNEL_EVENT                      \
 298         _IOW(0xF6, 0x63, struct lttng_kernel_event)
 299 #define LTTNG_KERNEL_SYSCALL_MASK               \
 300         _IOWR(0xF6, 0x64, struct lttng_kernel_syscall_mask)
 301
 302 /* Event and Channel FD ioctl */
 303 /* lttng-abi-old.h reserve 0x70. */
 304 #define LTTNG_KERNEL_CONTEXT                    \
 305         _IOW(0xF6, 0x71, struct lttng_kernel_context)
 306
 307 /* Event, Channel and Session ioctl */
 308 /* lttng-abi-old.h reserve 0x80 and 0x81. */
 309 #define LTTNG_KERNEL_ENABLE                     _IO(0xF6, 0x82)
 310 #define LTTNG_KERNEL_DISABLE                    _IO(0xF6, 0x83)
 311
 312 /* Event FD ioctl */
 313 #define LTTNG_KERNEL_FILTER                     _IO(0xF6, 0x90)
 314 #define LTTNG_KERNEL_ADD_CALLSITE               _IO(0xF6, 0x91)
 315
 316 /* Session FD ioctl (continued) */
 317 #define LTTNG_KERNEL_SESSION_LIST_TRACKER_IDS   \
 318         _IOR(0xF6, 0xA0, struct lttng_kernel_tracker_args)
 319 #define LTTNG_KERNEL_SESSION_TRACK_ID           \
 320         _IOR(0xF6, 0xA1, struct lttng_kernel_tracker_args)
 321 #define LTTNG_KERNEL_SESSION_UNTRACK_ID         \
 322         _IOR(0xF6, 0xA2, struct lttng_kernel_tracker_args)
 323
 324 /*
 325  * LTTng-specific ioctls for the lib ringbuffer.
 326  *
 327  * Operations applying to the current sub-buffer need to occur between
 328  * a get/put or get_next/put_next ioctl pair.
 329  */
 330
 331 /* returns the timestamp begin of the current sub-buffer */
 332 #define LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN   _IOR(0xF6, 0x20, uint64_t)
 333 /* returns the timestamp end of the current sub-buffer */
 334 #define LTTNG_RING_BUFFER_GET_TIMESTAMP_END     _IOR(0xF6, 0x21, uint64_t)
 335 /* returns the number of events discarded of the current sub-buffer */
 336 #define LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED  _IOR(0xF6, 0x22, uint64_t)
 337 /* returns the packet payload size of the current sub-buffer */
 338 #define LTTNG_RING_BUFFER_GET_CONTENT_SIZE      _IOR(0xF6, 0x23, uint64_t)
 339 /* returns the packet size of the current sub-buffer*/
 340 #define LTTNG_RING_BUFFER_GET_PACKET_SIZE       _IOR(0xF6, 0x24, uint64_t)
 341 /* returns the stream id (invariant for the stream) */
 342 #define LTTNG_RING_BUFFER_GET_STREAM_ID         _IOR(0xF6, 0x25, uint64_t)
 343 /* returns the current timestamp as perceived from the tracer */
 344 #define LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP _IOR(0xF6, 0x26, uint64_t)
 345 /* returns the packet sequence number of the current sub-buffer */
 346 #define LTTNG_RING_BUFFER_GET_SEQ_NUM           _IOR(0xF6, 0x27, uint64_t)
 347 /* returns the stream instance id (invariant for the stream) */
 348 #define LTTNG_RING_BUFFER_INSTANCE_ID           _IOR(0xF6, 0x28, uint64_t)
 349
 350 #ifdef CONFIG_COMPAT
 351 /* returns the timestamp begin of the current sub-buffer */
 352 #define LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN \
 353         LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN
 354 /* returns the timestamp end of the current sub-buffer */
 355 #define LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_END \
 356         LTTNG_RING_BUFFER_GET_TIMESTAMP_END
 357 /* returns the number of events discarded of the current sub-buffer */
 358 #define LTTNG_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED \
 359         LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED
 360 /* returns the packet payload size of the current sub-buffer */
 361 #define LTTNG_RING_BUFFER_COMPAT_GET_CONTENT_SIZE \
 362         LTTNG_RING_BUFFER_GET_CONTENT_SIZE
 363 /* returns the packet size of the current sub-buffer */
 364 #define LTTNG_RING_BUFFER_COMPAT_GET_PACKET_SIZE \
 365         LTTNG_RING_BUFFER_GET_PACKET_SIZE
 366 /* returns the stream id (invariant for the stream) */
 367 #define LTTNG_RING_BUFFER_COMPAT_GET_STREAM_ID \
 368         LTTNG_RING_BUFFER_GET_STREAM_ID
 369 /* returns the current timestamp as perceived from the tracer */
 370 #define LTTNG_RING_BUFFER_COMPAT_GET_CURRENT_TIMESTAMP \
 371         LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP
 372 /* returns the packet sequence number of the current sub-buffer */
 373 #define LTTNG_RING_BUFFER_COMPAT_GET_SEQ_NUM    \
 374         LTTNG_RING_BUFFER_GET_SEQ_NUM
 375 /* returns the stream instance id (invariant for the stream) */
 376 #define LTTNG_RING_BUFFER_COMPAT_INSTANCE_ID    \
 377         LTTNG_RING_BUFFER_INSTANCE_ID
 378 #endif /* CONFIG_COMPAT */
 379
 380 #endif /* _LTTNG_ABI_H */