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_EVENT_PADDING1        16
  91 #define LTTNG_UST_EVENT_PADDING2        (LTTNG_UST_SYM_NAME_LEN + 32)
  92 struct lttng_ust_event {
  93         enum lttng_ust_instrumentation instrumentation;
  94         char name[LTTNG_UST_SYM_NAME_LEN];      /* event name */
  95
  96         enum lttng_ust_loglevel_type loglevel_type;
  97         int loglevel;   /* value, -1: all */
  98         char padding[LTTNG_UST_EVENT_PADDING1];
  99
 100         /* Per instrumentation type configuration */
 101         union {
 102                 char padding[LTTNG_UST_EVENT_PADDING2];
 103         } u;
 104 } LTTNG_PACKED;
 105
 106 enum lttng_ust_field_type {
 107         LTTNG_UST_FIELD_OTHER                   = 0,
 108         LTTNG_UST_FIELD_INTEGER                 = 1,
 109         LTTNG_UST_FIELD_ENUM                    = 2,
 110         LTTNG_UST_FIELD_FLOAT                   = 3,
 111         LTTNG_UST_FIELD_STRING                  = 4,
 112 };
 113
 114 #define LTTNG_UST_FIELD_ITER_PADDING    (LTTNG_UST_SYM_NAME_LEN + 28)
 115 struct lttng_ust_field_iter {
 116         char event_name[LTTNG_UST_SYM_NAME_LEN];
 117         char field_name[LTTNG_UST_SYM_NAME_LEN];
 118         enum lttng_ust_field_type type;
 119         int loglevel;                           /* event loglevel */
 120         int nowrite;
 121         char padding[LTTNG_UST_FIELD_ITER_PADDING];
 122 } LTTNG_PACKED;
 123
 124 enum lttng_ust_context_type {
 125         LTTNG_UST_CONTEXT_VTID                  = 0,
 126         LTTNG_UST_CONTEXT_VPID                  = 1,
 127         LTTNG_UST_CONTEXT_PTHREAD_ID            = 2,
 128         LTTNG_UST_CONTEXT_PROCNAME              = 3,
 129         LTTNG_UST_CONTEXT_IP                    = 4,
 130         LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER   = 5,
 131         LTTNG_UST_CONTEXT_CPU_ID                = 6,
 132         LTTNG_UST_CONTEXT_APP_CONTEXT           = 7,
 133         LTTNG_UST_CONTEXT_CGROUP_NS             = 8,
 134         LTTNG_UST_CONTEXT_IPC_NS                = 9,
 135         LTTNG_UST_CONTEXT_MNT_NS                = 10,
 136         LTTNG_UST_CONTEXT_NET_NS                = 11,
 137         LTTNG_UST_CONTEXT_PID_NS                = 12,
 138         LTTNG_UST_CONTEXT_USER_NS               = 13,
 139         LTTNG_UST_CONTEXT_UTS_NS                = 14,
 140         LTTNG_UST_CONTEXT_VUID                  = 15,
 141         LTTNG_UST_CONTEXT_VEUID                 = 16,
 142         LTTNG_UST_CONTEXT_VSUID                 = 17,
 143         LTTNG_UST_CONTEXT_VGID                  = 18,
 144         LTTNG_UST_CONTEXT_VEGID                 = 19,
 145         LTTNG_UST_CONTEXT_VSGID                 = 20,
 146 };
 147
 148 struct lttng_ust_perf_counter_ctx {
 149         uint32_t type;
 150         uint64_t config;
 151         char name[LTTNG_UST_SYM_NAME_LEN];
 152 } LTTNG_PACKED;
 153
 154 #define LTTNG_UST_CONTEXT_PADDING1      16
 155 #define LTTNG_UST_CONTEXT_PADDING2      (LTTNG_UST_SYM_NAME_LEN + 32)
 156 struct lttng_ust_context {
 157         enum lttng_ust_context_type ctx;
 158         char padding[LTTNG_UST_CONTEXT_PADDING1];
 159
 160         union {
 161                 struct lttng_ust_perf_counter_ctx perf_counter;
 162                 struct {
 163                         /* Includes trailing '\0'. */
 164                         uint32_t provider_name_len;
 165                         uint32_t ctx_name_len;
 166                 } app_ctx;
 167                 char padding[LTTNG_UST_CONTEXT_PADDING2];
 168         } u;
 169 } LTTNG_PACKED;
 170
 171 /*
 172  * Tracer channel attributes.
 173  */
 174 #define LTTNG_UST_CHANNEL_ATTR_PADDING  (LTTNG_UST_SYM_NAME_LEN + 32)
 175 struct lttng_ust_channel_attr {
 176         uint64_t subbuf_size;                   /* bytes */
 177         uint64_t num_subbuf;                    /* power of 2 */
 178         int overwrite;                          /* 1: overwrite, 0: discard */
 179         unsigned int switch_timer_interval;     /* usec */
 180         unsigned int read_timer_interval;       /* usec */
 181         enum lttng_ust_output output;           /* splice, mmap */
 182         union {
 183                 struct {
 184                         int64_t blocking_timeout;       /* Blocking timeout (usec) */
 185                 } s;
 186                 char padding[LTTNG_UST_CHANNEL_ATTR_PADDING];
 187         } u;
 188 } LTTNG_PACKED;
 189
 190 #define LTTNG_UST_TRACEPOINT_ITER_PADDING       16
 191 struct lttng_ust_tracepoint_iter {
 192         char name[LTTNG_UST_SYM_NAME_LEN];      /* provider:name */
 193         int loglevel;
 194         char padding[LTTNG_UST_TRACEPOINT_ITER_PADDING];
 195 } LTTNG_PACKED;
 196
 197 enum lttng_ust_object_type {
 198         LTTNG_UST_OBJECT_TYPE_UNKNOWN = -1,
 199         LTTNG_UST_OBJECT_TYPE_CHANNEL = 0,
 200         LTTNG_UST_OBJECT_TYPE_STREAM = 1,
 201         LTTNG_UST_OBJECT_TYPE_EVENT = 2,
 202         LTTNG_UST_OBJECT_TYPE_CONTEXT = 3,
 203 };
 204
 205 #define LTTNG_UST_OBJECT_DATA_PADDING1  32
 206 #define LTTNG_UST_OBJECT_DATA_PADDING2  (LTTNG_UST_SYM_NAME_LEN + 32)
 207
 208 struct lttng_ust_object_data {
 209         enum lttng_ust_object_type type;
 210         int handle;
 211         uint64_t size;
 212         char padding1[LTTNG_UST_OBJECT_DATA_PADDING1];
 213         union {
 214                 struct {
 215                         void *data;
 216                         enum lttng_ust_chan_type type;
 217                         int wakeup_fd;
 218                 } channel;
 219                 struct {
 220                         int shm_fd;
 221                         int wakeup_fd;
 222                         uint32_t stream_nr;
 223                 } stream;
 224                 char padding2[LTTNG_UST_OBJECT_DATA_PADDING2];
 225         } u;
 226 } LTTNG_PACKED;
 227
 228 enum lttng_ust_calibrate_type {
 229         LTTNG_UST_CALIBRATE_TRACEPOINT,
 230 };
 231
 232 #define LTTNG_UST_CALIBRATE_PADDING1    16
 233 #define LTTNG_UST_CALIBRATE_PADDING2    (LTTNG_UST_SYM_NAME_LEN + 32)
 234 struct lttng_ust_calibrate {
 235         enum lttng_ust_calibrate_type type;     /* type (input) */
 236         char padding[LTTNG_UST_CALIBRATE_PADDING1];
 237
 238         union {
 239                 char padding[LTTNG_UST_CALIBRATE_PADDING2];
 240         } u;
 241 } LTTNG_PACKED;
 242
 243 #define FILTER_BYTECODE_MAX_LEN         65536
 244 #define LTTNG_UST_FILTER_PADDING        32
 245 struct lttng_ust_filter_bytecode {
 246         uint32_t len;
 247         uint32_t reloc_offset;
 248         uint64_t seqnum;
 249         char padding[LTTNG_UST_FILTER_PADDING];
 250         char data[0];
 251 } LTTNG_PACKED;
 252
 253 #define LTTNG_UST_EXCLUSION_PADDING     32
 254 struct lttng_ust_event_exclusion {
 255         uint32_t count;
 256         char padding[LTTNG_UST_EXCLUSION_PADDING];
 257         char names[LTTNG_UST_SYM_NAME_LEN][0];
 258 } LTTNG_PACKED;
 259
 260 #define _UST_CMD(minor)                         (minor)
 261 #define _UST_CMDR(minor, type)                  (minor)
 262 #define _UST_CMDW(minor, type)                  (minor)
 263
 264 /* Handled by object descriptor */
 265 #define LTTNG_UST_RELEASE                       _UST_CMD(0x1)
 266
 267 /* Handled by object cmd */
 268
 269 /* LTTng-UST commands */
 270 #define LTTNG_UST_SESSION                       _UST_CMD(0x40)
 271 #define LTTNG_UST_TRACER_VERSION                \
 272         _UST_CMDR(0x41, struct lttng_ust_tracer_version)
 273 #define LTTNG_UST_TRACEPOINT_LIST               _UST_CMD(0x42)
 274 #define LTTNG_UST_WAIT_QUIESCENT                _UST_CMD(0x43)
 275 #define LTTNG_UST_REGISTER_DONE                 _UST_CMD(0x44)
 276 #define LTTNG_UST_TRACEPOINT_FIELD_LIST         _UST_CMD(0x45)
 277
 278 /* Session FD commands */
 279 #define LTTNG_UST_CHANNEL                       \
 280         _UST_CMDW(0x51, struct lttng_ust_channel)
 281 #define LTTNG_UST_SESSION_START                 _UST_CMD(0x52)
 282 #define LTTNG_UST_SESSION_STOP                  _UST_CMD(0x53)
 283 #define LTTNG_UST_SESSION_STATEDUMP             _UST_CMD(0x54)
 284
 285 /* Channel FD commands */
 286 #define LTTNG_UST_STREAM                        _UST_CMD(0x60)
 287 #define LTTNG_UST_EVENT                 \
 288         _UST_CMDW(0x61, struct lttng_ust_event)
 289
 290 /* Event and Channel FD commands */
 291 #define LTTNG_UST_CONTEXT                       \
 292         _UST_CMDW(0x70, struct lttng_ust_context)
 293 #define LTTNG_UST_FLUSH_BUFFER                  \
 294         _UST_CMD(0x71)
 295
 296 /* Event, Channel and Session commands */
 297 #define LTTNG_UST_ENABLE                        _UST_CMD(0x80)
 298 #define LTTNG_UST_DISABLE                       _UST_CMD(0x81)
 299
 300 /* Tracepoint list commands */
 301 #define LTTNG_UST_TRACEPOINT_LIST_GET           _UST_CMD(0x90)
 302 #define LTTNG_UST_TRACEPOINT_FIELD_LIST_GET     _UST_CMD(0x91)
 303
 304 /* Event FD commands */
 305 #define LTTNG_UST_FILTER                        _UST_CMD(0xA0)
 306 #define LTTNG_UST_EXCLUSION                     _UST_CMD(0xA1)
 307
 308 #define LTTNG_UST_ROOT_HANDLE   0
 309
 310 struct lttng_ust_obj;
 311
 312 union ust_args {
 313         struct {
 314                 void *chan_data;
 315                 int wakeup_fd;
 316         } channel;
 317         struct {
 318                 int shm_fd;
 319                 int wakeup_fd;
 320         } stream;
 321         struct {
 322                 struct lttng_ust_field_iter entry;
 323         } field_list;
 324         struct {
 325                 char *ctxname;
 326         } app_context;
 327 };
 328
 329 struct lttng_ust_objd_ops {
 330         long (*cmd)(int objd, unsigned int cmd, unsigned long arg,
 331                 union ust_args *args, void *owner);
 332         int (*release)(int objd);
 333 };
 334
 335 /* Create root handle. Always ID 0. */
 336 int lttng_abi_create_root_handle(void);
 337
 338 const struct lttng_ust_objd_ops *objd_ops(int id);
 339 int lttng_ust_objd_unref(int id, int is_owner);
 340
 341 void lttng_ust_abi_exit(void);
 342 void lttng_ust_events_exit(void);
 343 void lttng_ust_objd_table_owner_cleanup(void *owner);
 344
 345 #endif /* LTTNG_UST_ABI_INTERNAL_H */