src/bin/lttng-sessiond/ust-abi-internal.h

   1 /*
   2  * Copyright 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   3  *
   4  * SPDX-License-Identifier: MIT
   5  *
   6  * Copied from LTTng-UST lttng/ust-abi.h
   7  *
   8  * LTTng-UST ABI header
   9  *
  10  */
  11
  12 #ifndef LTTNG_UST_ABI_INTERNAL_H
  13 #define LTTNG_UST_ABI_INTERNAL_H
  14
  15 #include <stdint.h>
  16 #include <common/macros.h>
  17
  18 #ifndef LTTNG_PACKED
  19 #error "LTTNG_PACKED should be defined"
  20 #endif
  21
  22 #ifndef __ust_stringify
  23 #define __ust_stringify1(x)     #x
  24 #define __ust_stringify(x)      __ust_stringify1(x)
  25 #endif /* __ust_stringify */
  26
  27 #define LTTNG_UST_SYM_NAME_LEN                  256
  28 #define LTTNG_UST_ABI_PROCNAME_LEN              16
  29
  30 /* UST comm magic number, used to validate protocol and endianness. */
  31 #define LTTNG_UST_COMM_MAGIC                    0xC57C57C5
  32
  33 /* Version for ABI between liblttng-ust, sessiond, consumerd */
  34 #define LTTNG_UST_ABI_MAJOR_VERSION             8
  35 #define LTTNG_UST_ABI_MINOR_VERSION             1
  36
  37 enum lttng_ust_instrumentation {
  38         LTTNG_UST_TRACEPOINT            = 0,
  39         LTTNG_UST_PROBE                 = 1,
  40         LTTNG_UST_FUNCTION              = 2,
  41 };
  42
  43 enum lttng_ust_loglevel_type {
  44         LTTNG_UST_LOGLEVEL_ALL          = 0,
  45         LTTNG_UST_LOGLEVEL_RANGE        = 1,
  46         LTTNG_UST_LOGLEVEL_SINGLE       = 2,
  47 };
  48
  49 enum lttng_ust_output {
  50         LTTNG_UST_MMAP          = 0,
  51 };
  52
  53 enum lttng_ust_chan_type {
  54         LTTNG_UST_CHAN_PER_CPU = 0,
  55         LTTNG_UST_CHAN_METADATA = 1,
  56 };
  57
  58 struct lttng_ust_tracer_version {
  59         uint32_t major;
  60         uint32_t minor;
  61         uint32_t patchlevel;
  62 } LTTNG_PACKED;
  63
  64 #define LTTNG_UST_CHANNEL_PADDING       (LTTNG_UST_SYM_NAME_LEN + 32)
  65 /*
  66  * Given that the consumerd is limited to 64k file descriptors, we
  67  * cannot expect much more than 1MB channel structure size. This size is
  68  * depends on the number of streams within a channel, which depends on
  69  * the number of possible CPUs on the system.
  70  */
  71 #define LTTNG_UST_CHANNEL_DATA_MAX_LEN  1048576U
  72 struct lttng_ust_channel {
  73         uint64_t len;
  74         enum lttng_ust_chan_type type;
  75         char padding[LTTNG_UST_CHANNEL_PADDING];
  76         char data[];    /* variable sized data */
  77 } LTTNG_PACKED;
  78
  79 #define LTTNG_UST_STREAM_PADDING1       (LTTNG_UST_SYM_NAME_LEN + 32)
  80 struct lttng_ust_stream {
  81         uint64_t len;           /* shm len */
  82         uint32_t stream_nr;     /* stream number */
  83         char padding[LTTNG_UST_STREAM_PADDING1];
  84         /*
  85          * shm_fd and wakeup_fd are send over unix socket as file
  86          * descriptors after this structure.
  87          */
  88 } LTTNG_PACKED;
  89
  90 #define LTTNG_UST_TRIGGER_PADDING1      16
  91 #define LTTNG_UST_TRIGGER_PADDING2      (LTTNG_UST_SYM_NAME_LEN + 32)
  92 struct lttng_ust_trigger {
  93         uint64_t id;
  94         enum lttng_ust_instrumentation instrumentation;
  95         char name[LTTNG_UST_SYM_NAME_LEN];      /* event name */
  96
  97         enum lttng_ust_loglevel_type loglevel_type;
  98         int loglevel;   /* value, -1: all */
  99         char padding[LTTNG_UST_TRIGGER_PADDING1];
 100
 101         /* Per instrumentation type configuration */
 102         union {
 103                 char padding[LTTNG_UST_TRIGGER_PADDING2];
 104         } u;
 105 } LTTNG_PACKED;
 106
 107 #define LTTNG_TRIGGER_NOTIFICATION_PADDING 32
 108 struct lttng_ust_trigger_notification {
 109         uint64_t id;
 110         char padding[LTTNG_TRIGGER_NOTIFICATION_PADDING];
 111 } LTTNG_PACKED;
 112
 113 #define LTTNG_UST_EVENT_PADDING1        16
 114 #define LTTNG_UST_EVENT_PADDING2        (LTTNG_UST_SYM_NAME_LEN + 32)
 115 struct lttng_ust_event {
 116         enum lttng_ust_instrumentation instrumentation;
 117         char name[LTTNG_UST_SYM_NAME_LEN];      /* event name */
 118
 119         enum lttng_ust_loglevel_type loglevel_type;
 120         int loglevel;   /* value, -1: all */
 121         char padding[LTTNG_UST_EVENT_PADDING1];
 122
 123         /* Per instrumentation type configuration */
 124         union {
 125                 char padding[LTTNG_UST_EVENT_PADDING2];
 126         } u;
 127 } LTTNG_PACKED;
 128
 129 enum lttng_ust_field_type {
 130         LTTNG_UST_FIELD_OTHER                   = 0,
 131         LTTNG_UST_FIELD_INTEGER                 = 1,
 132         LTTNG_UST_FIELD_ENUM                    = 2,
 133         LTTNG_UST_FIELD_FLOAT                   = 3,
 134         LTTNG_UST_FIELD_STRING                  = 4,
 135 };
 136
 137 #define LTTNG_UST_FIELD_ITER_PADDING    (LTTNG_UST_SYM_NAME_LEN + 28)
 138 struct lttng_ust_field_iter {
 139         char event_name[LTTNG_UST_SYM_NAME_LEN];
 140         char field_name[LTTNG_UST_SYM_NAME_LEN];
 141         enum lttng_ust_field_type type;
 142         int loglevel;                           /* event loglevel */
 143         int nowrite;
 144         char padding[LTTNG_UST_FIELD_ITER_PADDING];
 145 } LTTNG_PACKED;
 146
 147 enum lttng_ust_context_type {
 148         LTTNG_UST_CONTEXT_VTID                  = 0,
 149         LTTNG_UST_CONTEXT_VPID                  = 1,
 150         LTTNG_UST_CONTEXT_PTHREAD_ID            = 2,
 151         LTTNG_UST_CONTEXT_PROCNAME              = 3,
 152         LTTNG_UST_CONTEXT_IP                    = 4,
 153         LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER   = 5,
 154         LTTNG_UST_CONTEXT_CPU_ID                = 6,
 155         LTTNG_UST_CONTEXT_APP_CONTEXT           = 7,
 156         LTTNG_UST_CONTEXT_CGROUP_NS             = 8,
 157         LTTNG_UST_CONTEXT_IPC_NS                = 9,
 158         LTTNG_UST_CONTEXT_MNT_NS                = 10,
 159         LTTNG_UST_CONTEXT_NET_NS                = 11,
 160         LTTNG_UST_CONTEXT_PID_NS                = 12,
 161         LTTNG_UST_CONTEXT_USER_NS               = 13,
 162         LTTNG_UST_CONTEXT_UTS_NS                = 14,
 163         LTTNG_UST_CONTEXT_VUID                  = 15,
 164         LTTNG_UST_CONTEXT_VEUID                 = 16,
 165         LTTNG_UST_CONTEXT_VSUID                 = 17,
 166         LTTNG_UST_CONTEXT_VGID                  = 18,
 167         LTTNG_UST_CONTEXT_VEGID                 = 19,
 168         LTTNG_UST_CONTEXT_VSGID                 = 20,
 169 };
 170
 171 struct lttng_ust_perf_counter_ctx {
 172         uint32_t type;
 173         uint64_t config;
 174         char name[LTTNG_UST_SYM_NAME_LEN];
 175 } LTTNG_PACKED;
 176
 177 #define LTTNG_UST_CONTEXT_PADDING1      16
 178 #define LTTNG_UST_CONTEXT_PADDING2      (LTTNG_UST_SYM_NAME_LEN + 32)
 179 struct lttng_ust_context {
 180         enum lttng_ust_context_type ctx;
 181         char padding[LTTNG_UST_CONTEXT_PADDING1];
 182
 183         union {
 184                 struct lttng_ust_perf_counter_ctx perf_counter;
 185                 struct {
 186                         /* Includes trailing '\0'. */
 187                         uint32_t provider_name_len;
 188                         uint32_t ctx_name_len;
 189                 } app_ctx;
 190                 char padding[LTTNG_UST_CONTEXT_PADDING2];
 191         } u;
 192 } LTTNG_PACKED;
 193
 194 /*
 195  * Tracer channel attributes.
 196  */
 197 #define LTTNG_UST_CHANNEL_ATTR_PADDING  (LTTNG_UST_SYM_NAME_LEN + 32)
 198 struct lttng_ust_channel_attr {
 199         uint64_t subbuf_size;                   /* bytes */
 200         uint64_t num_subbuf;                    /* power of 2 */
 201         int overwrite;                          /* 1: overwrite, 0: discard */
 202         unsigned int switch_timer_interval;     /* usec */
 203         unsigned int read_timer_interval;       /* usec */
 204         enum lttng_ust_output output;           /* splice, mmap */
 205         union {
 206                 struct {
 207                         int64_t blocking_timeout;       /* Blocking timeout (usec) */
 208                 } s;
 209                 char padding[LTTNG_UST_CHANNEL_ATTR_PADDING];
 210         } u;
 211 } LTTNG_PACKED;
 212
 213 #define LTTNG_UST_TRACEPOINT_ITER_PADDING       16
 214 struct lttng_ust_tracepoint_iter {
 215         char name[LTTNG_UST_SYM_NAME_LEN];      /* provider:name */
 216         int loglevel;
 217         char padding[LTTNG_UST_TRACEPOINT_ITER_PADDING];
 218 } LTTNG_PACKED;
 219
 220 enum lttng_ust_object_type {
 221         LTTNG_UST_OBJECT_TYPE_UNKNOWN = -1,
 222         LTTNG_UST_OBJECT_TYPE_CHANNEL = 0,
 223         LTTNG_UST_OBJECT_TYPE_STREAM = 1,
 224         LTTNG_UST_OBJECT_TYPE_EVENT = 2,
 225         LTTNG_UST_OBJECT_TYPE_CONTEXT = 3,
 226 };
 227
 228 #define LTTNG_UST_OBJECT_DATA_PADDING1  32
 229 #define LTTNG_UST_OBJECT_DATA_PADDING2  (LTTNG_UST_SYM_NAME_LEN + 32)
 230
 231 struct lttng_ust_object_data {
 232         enum lttng_ust_object_type type;
 233         int handle;
 234         uint64_t size;
 235         char padding1[LTTNG_UST_OBJECT_DATA_PADDING1];
 236         union {
 237                 struct {
 238                         void *data;
 239                         enum lttng_ust_chan_type type;
 240                         int wakeup_fd;
 241                 } channel;
 242                 struct {
 243                         int shm_fd;
 244                         int wakeup_fd;
 245                         uint32_t stream_nr;
 246                 } stream;
 247                 char padding2[LTTNG_UST_OBJECT_DATA_PADDING2];
 248         } u;
 249 } LTTNG_PACKED;
 250
 251 enum lttng_ust_calibrate_type {
 252         LTTNG_UST_CALIBRATE_TRACEPOINT,
 253 };
 254
 255 #define LTTNG_UST_CALIBRATE_PADDING1    16
 256 #define LTTNG_UST_CALIBRATE_PADDING2    (LTTNG_UST_SYM_NAME_LEN + 32)
 257 struct lttng_ust_calibrate {
 258         enum lttng_ust_calibrate_type type;     /* type (input) */
 259         char padding[LTTNG_UST_CALIBRATE_PADDING1];
 260
 261         union {
 262                 char padding[LTTNG_UST_CALIBRATE_PADDING2];
 263         } u;
 264 } LTTNG_PACKED;
 265
 266 #define FILTER_BYTECODE_MAX_LEN         65536
 267 #define LTTNG_UST_FILTER_PADDING        32
 268 struct lttng_ust_filter_bytecode {
 269         uint32_t len;
 270         uint32_t reloc_offset;
 271         uint64_t seqnum;
 272         char padding[LTTNG_UST_FILTER_PADDING];
 273         char data[0];
 274 } LTTNG_PACKED;
 275
 276 #define LTTNG_UST_EXCLUSION_PADDING     32
 277 struct lttng_ust_event_exclusion {
 278         uint32_t count;
 279         char padding[LTTNG_UST_EXCLUSION_PADDING];
 280         char names[LTTNG_UST_SYM_NAME_LEN][0];
 281 } LTTNG_PACKED;
 282
 283 #define _UST_CMD(minor)                         (minor)
 284 #define _UST_CMDR(minor, type)                  (minor)
 285 #define _UST_CMDW(minor, type)                  (minor)
 286
 287 /* Handled by object descriptor */
 288 #define LTTNG_UST_RELEASE                       _UST_CMD(0x1)
 289
 290 /* Handled by object cmd */
 291
 292 /* LTTng-UST commands */
 293 #define LTTNG_UST_SESSION                       _UST_CMD(0x40)
 294 #define LTTNG_UST_TRACER_VERSION                \
 295         _UST_CMDR(0x41, struct lttng_ust_tracer_version)
 296 #define LTTNG_UST_TRACEPOINT_LIST               _UST_CMD(0x42)
 297 #define LTTNG_UST_WAIT_QUIESCENT                _UST_CMD(0x43)
 298 #define LTTNG_UST_REGISTER_DONE                 _UST_CMD(0x44)
 299 #define LTTNG_UST_TRACEPOINT_FIELD_LIST         _UST_CMD(0x45)
 300
 301 /* Session FD commands */
 302 #define LTTNG_UST_CHANNEL                       \
 303         _UST_CMDW(0x51, struct lttng_ust_channel)
 304 #define LTTNG_UST_SESSION_START                 _UST_CMD(0x52)
 305 #define LTTNG_UST_SESSION_STOP                  _UST_CMD(0x53)
 306 #define LTTNG_UST_SESSION_STATEDUMP             _UST_CMD(0x54)
 307
 308 /* Channel FD commands */
 309 #define LTTNG_UST_STREAM                        _UST_CMD(0x60)
 310 #define LTTNG_UST_EVENT                 \
 311         _UST_CMDW(0x61, struct lttng_ust_event)
 312
 313 /* Event and Channel FD commands */
 314 #define LTTNG_UST_CONTEXT                       \
 315         _UST_CMDW(0x70, struct lttng_ust_context)
 316 #define LTTNG_UST_FLUSH_BUFFER                  \
 317         _UST_CMD(0x71)
 318
 319 /* Event, Channel and Session commands */
 320 #define LTTNG_UST_ENABLE                        _UST_CMD(0x80)
 321 #define LTTNG_UST_DISABLE                       _UST_CMD(0x81)
 322
 323 /* Tracepoint list commands */
 324 #define LTTNG_UST_TRACEPOINT_LIST_GET           _UST_CMD(0x90)
 325 #define LTTNG_UST_TRACEPOINT_FIELD_LIST_GET     _UST_CMD(0x91)
 326
 327 /* Event FD commands */
 328 #define LTTNG_UST_FILTER                        _UST_CMD(0xA0)
 329 #define LTTNG_UST_EXCLUSION                     _UST_CMD(0xA1)
 330
 331 #define LTTNG_UST_TRIGGER_SEND_FD               _UST_CMD(0xB0)
 332 #define LTTNG_UST_TRIGGER_CREATE                _UST_CMDW(0xB1, struct lttng_ust_trigger)
 333
 334 #define LTTNG_UST_ROOT_HANDLE   0
 335
 336 struct lttng_ust_obj;
 337
 338 union ust_args {
 339         struct {
 340                 void *chan_data;
 341                 int wakeup_fd;
 342         } channel;
 343         struct {
 344                 int shm_fd;
 345                 int wakeup_fd;
 346         } stream;
 347         struct {
 348                 struct lttng_ust_field_iter entry;
 349         } field_list;
 350         struct {
 351                 char *ctxname;
 352         } app_context;
 353 };
 354
 355 struct lttng_ust_objd_ops {
 356         long (*cmd)(int objd, unsigned int cmd, unsigned long arg,
 357                 union ust_args *args, void *owner);
 358         int (*release)(int objd);
 359 };
 360
 361 /* Create root handle. Always ID 0. */
 362 int lttng_abi_create_root_handle(void);
 363
 364 const struct lttng_ust_objd_ops *objd_ops(int id);
 365 int lttng_ust_objd_unref(int id, int is_owner);
 366
 367 void lttng_ust_abi_exit(void);
 368 void lttng_ust_events_exit(void);
 369 void lttng_ust_objd_table_owner_cleanup(void *owner);
 370
 371 #endif /* LTTNG_UST_ABI_INTERNAL_H */