lttng-events.h

   1 #ifndef _LTTNG_EVENTS_H
   2 #define _LTTNG_EVENTS_H
   3
   4 /*
   5  * lttng-events.h
   6  *
   7  * Holds LTTng per-session event registry.
   8  *
   9  * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  10  *
  11  * This library is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU Lesser General Public
  13  * License as published by the Free Software Foundation; only
  14  * version 2.1 of the License.
  15  *
  16  * This library is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  19  * Lesser General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU Lesser General Public
  22  * License along with this library; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  24  */
  25
  26 #include <linux/version.h>
  27 #include <linux/list.h>
  28 #include <linux/kprobes.h>
  29 #include <linux/kref.h>
  30 #include <lttng-cpuhotplug.h>
  31 #include <wrapper/uuid.h>
  32 #include <lttng-abi.h>
  33 #include <lttng-abi-old.h>
  34
  35 #define lttng_is_signed_type(type)      (((type)(-1)) < 0)
  36
  37 struct lttng_channel;
  38 struct lttng_session;
  39 struct lttng_metadata_cache;
  40 struct lib_ring_buffer_ctx;
  41 struct perf_event;
  42 struct perf_event_attr;
  43 struct lib_ring_buffer_config;
  44
  45 /* Type description */
  46
  47 enum abstract_types {
  48         atype_integer,
  49         atype_enum,
  50         atype_array,
  51         atype_sequence,
  52         atype_string,
  53         NR_ABSTRACT_TYPES,
  54 };
  55
  56 enum lttng_string_encodings {
  57         lttng_encode_none = 0,
  58         lttng_encode_UTF8 = 1,
  59         lttng_encode_ASCII = 2,
  60         NR_STRING_ENCODINGS,
  61 };
  62
  63 enum channel_type {
  64         PER_CPU_CHANNEL,
  65         METADATA_CHANNEL,
  66 };
  67
  68 struct lttng_enum_entry {
  69         unsigned long long start, end;  /* start and end are inclusive */
  70         const char *string;
  71 };
  72
  73 #define __type_integer(_type, _size, _alignment, _signedness,   \
  74                 _byte_order, _base, _encoding)  \
  75         {                                                       \
  76             .atype = atype_integer,                             \
  77             .u.basic.integer =                                  \
  78                 {                                               \
  79                   .size = (_size) ? : sizeof(_type) * CHAR_BIT, \
  80                   .alignment = (_alignment) ? : lttng_alignof(_type) * CHAR_BIT, \
  81                   .signedness = (_signedness) >= 0 ? (_signedness) : lttng_is_signed_type(_type), \
  82                   .reverse_byte_order = _byte_order != __BYTE_ORDER, \
  83                   .base = _base,                                \
  84                   .encoding = lttng_encode_##_encoding,         \
  85                 },                                              \
  86         }                                                       \
  87
  88 struct lttng_integer_type {
  89         unsigned int size;              /* in bits */
  90         unsigned short alignment;       /* in bits */
  91         unsigned int signedness:1,
  92                 reverse_byte_order:1;
  93         unsigned int base;              /* 2, 8, 10, 16, for pretty print */
  94         enum lttng_string_encodings encoding;
  95 };
  96
  97 union _lttng_basic_type {
  98         struct lttng_integer_type integer;
  99         struct {
 100                 const char *name;
 101         } enumeration;
 102         struct {
 103                 enum lttng_string_encodings encoding;
 104         } string;
 105 };
 106
 107 struct lttng_basic_type {
 108         enum abstract_types atype;
 109         union {
 110                 union _lttng_basic_type basic;
 111         } u;
 112 };
 113
 114 struct lttng_type {
 115         enum abstract_types atype;
 116         union {
 117                 union _lttng_basic_type basic;
 118                 struct {
 119                         struct lttng_basic_type elem_type;
 120                         unsigned int length;            /* num. elems. */
 121                         unsigned int elem_alignment;    /* alignment override */
 122                 } array;
 123                 struct {
 124                         struct lttng_basic_type length_type;
 125                         struct lttng_basic_type elem_type;
 126                         unsigned int elem_alignment;    /* alignment override */
 127                 } sequence;
 128         } u;
 129 };
 130
 131 struct lttng_enum {
 132         const char *name;
 133         struct lttng_type container_type;
 134         const struct lttng_enum_entry *entries;
 135         unsigned int len;
 136 };
 137
 138 /* Event field description */
 139
 140 struct lttng_event_field {
 141         const char *name;
 142         struct lttng_type type;
 143         unsigned int nowrite:1,         /* do not write into trace */
 144                         user:1;         /* fetch from user-space */
 145 };
 146
 147 union lttng_ctx_value {
 148         int64_t s64;
 149         const char *str;
 150         double d;
 151 };
 152
 153 /*
 154  * We need to keep this perf counter field separately from struct
 155  * lttng_ctx_field because cpu hotplug needs fixed-location addresses.
 156  */
 157 struct lttng_perf_counter_field {
 158 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))
 159         struct lttng_cpuhp_node cpuhp_prepare;
 160         struct lttng_cpuhp_node cpuhp_online;
 161 #else
 162         struct notifier_block nb;
 163         int hp_enable;
 164 #endif
 165         struct perf_event_attr *attr;
 166         struct perf_event **e;  /* per-cpu array */
 167 };
 168
 169 struct lttng_probe_ctx {
 170         struct lttng_event *event;
 171         uint8_t interruptible;
 172 };
 173
 174 struct lttng_ctx_field {
 175         struct lttng_event_field event_field;
 176         size_t (*get_size)(size_t offset);
 177         void (*record)(struct lttng_ctx_field *field,
 178                        struct lib_ring_buffer_ctx *ctx,
 179                        struct lttng_channel *chan);
 180         void (*get_value)(struct lttng_ctx_field *field,
 181                          struct lttng_probe_ctx *lttng_probe_ctx,
 182                          union lttng_ctx_value *value);
 183         union {
 184                 struct lttng_perf_counter_field *perf_counter;
 185         } u;
 186         void (*destroy)(struct lttng_ctx_field *field);
 187 };
 188
 189 struct lttng_ctx {
 190         struct lttng_ctx_field *fields;
 191         unsigned int nr_fields;
 192         unsigned int allocated_fields;
 193         size_t largest_align;   /* in bytes */
 194 };
 195
 196 struct lttng_event_desc {
 197         const char *name;               /* lttng-modules name */
 198         const char *kname;              /* Linux kernel name (tracepoints) */
 199         void *probe_callback;
 200         const struct lttng_event_ctx *ctx;      /* context */
 201         const struct lttng_event_field *fields; /* event payload */
 202         unsigned int nr_fields;
 203         struct module *owner;
 204 };
 205
 206 struct lttng_probe_desc {
 207         const char *provider;
 208         const struct lttng_event_desc **event_desc;
 209         unsigned int nr_events;
 210         struct list_head head;                  /* chain registered probes */
 211         struct list_head lazy_init_head;
 212         int lazy;                               /* lazy registration */
 213 };
 214
 215 struct lttng_krp;                               /* Kretprobe handling */
 216
 217 enum lttng_event_type {
 218         LTTNG_TYPE_EVENT = 0,
 219         LTTNG_TYPE_ENABLER = 1,
 220 };
 221
 222 struct lttng_filter_bytecode_node {
 223         struct list_head node;
 224         struct lttng_enabler *enabler;
 225         /*
 226          * struct lttng_kernel_filter_bytecode has var. sized array, must be
 227          * last field.
 228          */
 229         struct lttng_kernel_filter_bytecode bc;
 230 };
 231
 232 /*
 233  * Filter return value masks.
 234  */
 235 enum lttng_filter_ret {
 236         LTTNG_FILTER_DISCARD = 0,
 237         LTTNG_FILTER_RECORD_FLAG = (1ULL << 0),
 238         /* Other bits are kept for future use. */
 239 };
 240
 241 struct lttng_bytecode_runtime {
 242         /* Associated bytecode */
 243         struct lttng_filter_bytecode_node *bc;
 244         uint64_t (*filter)(void *filter_data, struct lttng_probe_ctx *lttng_probe_ctx,
 245                         const char *filter_stack_data);
 246         int link_failed;
 247         struct list_head node;  /* list of bytecode runtime in event */
 248 };
 249
 250 /*
 251  * Objects in a linked-list of enablers, owned by an event.
 252  */
 253 struct lttng_enabler_ref {
 254         struct list_head node;                  /* enabler ref list */
 255         struct lttng_enabler *ref;              /* backward ref */
 256 };
 257
 258 /*
 259  * lttng_event structure is referred to by the tracing fast path. It must be
 260  * kept small.
 261  */
 262 struct lttng_event {
 263         enum lttng_event_type evtype;   /* First field. */
 264         unsigned int id;
 265         struct lttng_channel *chan;
 266         int enabled;
 267         const struct lttng_event_desc *desc;
 268         void *filter;
 269         struct lttng_ctx *ctx;
 270         enum lttng_kernel_instrumentation instrumentation;
 271         union {
 272                 struct {
 273                         struct kprobe kp;
 274                         char *symbol_name;
 275                 } kprobe;
 276                 struct {
 277                         struct lttng_krp *lttng_krp;
 278                         char *symbol_name;
 279                 } kretprobe;
 280                 struct {
 281                         char *symbol_name;
 282                 } ftrace;
 283         } u;
 284         struct list_head list;          /* Event list in session */
 285         unsigned int metadata_dumped:1;
 286
 287         /* Backward references: list of lttng_enabler_ref (ref to enablers) */
 288         struct list_head enablers_ref_head;
 289         struct hlist_node hlist;        /* session ht of events */
 290         int registered;                 /* has reg'd tracepoint probe */
 291         /* list of struct lttng_bytecode_runtime, sorted by seqnum */
 292         struct list_head bytecode_runtime_head;
 293         int has_enablers_without_bytecode;
 294 };
 295
 296 enum lttng_enabler_type {
 297         LTTNG_ENABLER_WILDCARD,
 298         LTTNG_ENABLER_NAME,
 299 };
 300
 301 /*
 302  * Enabler field, within whatever object is enabling an event. Target of
 303  * backward reference.
 304  */
 305 struct lttng_enabler {
 306         enum lttng_event_type evtype;   /* First field. */
 307
 308         enum lttng_enabler_type type;
 309
 310         struct list_head node;  /* per-session list of enablers */
 311         /* head list of struct lttng_ust_filter_bytecode_node */
 312         struct list_head filter_bytecode_head;
 313
 314         struct lttng_kernel_event event_param;
 315         struct lttng_channel *chan;
 316         struct lttng_ctx *ctx;
 317         unsigned int enabled:1;
 318 };
 319
 320 struct lttng_channel_ops {
 321         struct channel *(*channel_create)(const char *name,
 322                                 struct lttng_channel *lttng_chan,
 323                                 void *buf_addr,
 324                                 size_t subbuf_size, size_t num_subbuf,
 325                                 unsigned int switch_timer_interval,
 326                                 unsigned int read_timer_interval);
 327         void (*channel_destroy)(struct channel *chan);
 328         struct lib_ring_buffer *(*buffer_read_open)(struct channel *chan);
 329         int (*buffer_has_read_closed_stream)(struct channel *chan);
 330         void (*buffer_read_close)(struct lib_ring_buffer *buf);
 331         int (*event_reserve)(struct lib_ring_buffer_ctx *ctx,
 332                              uint32_t event_id);
 333         void (*event_commit)(struct lib_ring_buffer_ctx *ctx);
 334         void (*event_write)(struct lib_ring_buffer_ctx *ctx, const void *src,
 335                             size_t len);
 336         void (*event_write_from_user)(struct lib_ring_buffer_ctx *ctx,
 337                                       const void *src, size_t len);
 338         void (*event_memset)(struct lib_ring_buffer_ctx *ctx,
 339                              int c, size_t len);
 340         void (*event_strcpy)(struct lib_ring_buffer_ctx *ctx, const char *src,
 341                              size_t len);
 342         void (*event_strcpy_from_user)(struct lib_ring_buffer_ctx *ctx,
 343                                        const char __user *src, size_t len);
 344         /*
 345          * packet_avail_size returns the available size in the current
 346          * packet. Note that the size returned is only a hint, since it
 347          * may change due to concurrent writes.
 348          */
 349         size_t (*packet_avail_size)(struct channel *chan);
 350         wait_queue_head_t *(*get_writer_buf_wait_queue)(struct channel *chan, int cpu);
 351         wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
 352         int (*is_finalized)(struct channel *chan);
 353         int (*is_disabled)(struct channel *chan);
 354         int (*timestamp_begin) (const struct lib_ring_buffer_config *config,
 355                         struct lib_ring_buffer *bufb,
 356                         uint64_t *timestamp_begin);
 357         int (*timestamp_end) (const struct lib_ring_buffer_config *config,
 358                         struct lib_ring_buffer *bufb,
 359                         uint64_t *timestamp_end);
 360         int (*events_discarded) (const struct lib_ring_buffer_config *config,
 361                         struct lib_ring_buffer *bufb,
 362                         uint64_t *events_discarded);
 363         int (*content_size) (const struct lib_ring_buffer_config *config,
 364                         struct lib_ring_buffer *bufb,
 365                         uint64_t *content_size);
 366         int (*packet_size) (const struct lib_ring_buffer_config *config,
 367                         struct lib_ring_buffer *bufb,
 368                         uint64_t *packet_size);
 369         int (*stream_id) (const struct lib_ring_buffer_config *config,
 370                         struct lib_ring_buffer *bufb,
 371                         uint64_t *stream_id);
 372         int (*current_timestamp) (const struct lib_ring_buffer_config *config,
 373                         struct lib_ring_buffer *bufb,
 374                         uint64_t *ts);
 375         int (*sequence_number) (const struct lib_ring_buffer_config *config,
 376                         struct lib_ring_buffer *bufb,
 377                         uint64_t *seq);
 378         int (*instance_id) (const struct lib_ring_buffer_config *config,
 379                         struct lib_ring_buffer *bufb,
 380                         uint64_t *id);
 381 };
 382
 383 struct lttng_transport {
 384         char *name;
 385         struct module *owner;
 386         struct list_head node;
 387         struct lttng_channel_ops ops;
 388 };
 389
 390 struct lttng_syscall_filter;
 391
 392 #define LTTNG_EVENT_HT_BITS             12
 393 #define LTTNG_EVENT_HT_SIZE             (1U << LTTNG_EVENT_HT_BITS)
 394
 395 struct lttng_event_ht {
 396         struct hlist_head table[LTTNG_EVENT_HT_SIZE];
 397 };
 398
 399 struct lttng_channel {
 400         unsigned int id;
 401         struct channel *chan;           /* Channel buffers */
 402         int enabled;
 403         struct lttng_ctx *ctx;
 404         /* Event ID management */
 405         struct lttng_session *session;
 406         struct file *file;              /* File associated to channel */
 407         unsigned int free_event_id;     /* Next event ID to allocate */
 408         struct list_head list;          /* Channel list */
 409         struct lttng_channel_ops *ops;
 410         struct lttng_transport *transport;
 411         struct lttng_event **sc_table;  /* for syscall tracing */
 412         struct lttng_event **compat_sc_table;
 413         struct lttng_event **sc_exit_table;     /* for syscall exit tracing */
 414         struct lttng_event **compat_sc_exit_table;
 415         struct lttng_event *sc_unknown; /* for unknown syscalls */
 416         struct lttng_event *sc_compat_unknown;
 417         struct lttng_event *sc_exit_unknown;
 418         struct lttng_event *compat_sc_exit_unknown;
 419         struct lttng_syscall_filter *sc_filter;
 420         int header_type;                /* 0: unset, 1: compact, 2: large */
 421         enum channel_type channel_type;
 422         unsigned int metadata_dumped:1,
 423                 sys_enter_registered:1,
 424                 sys_exit_registered:1,
 425                 syscall_all:1,
 426                 tstate:1;               /* Transient enable state */
 427 };
 428
 429 struct lttng_metadata_stream {
 430         void *priv;                     /* Ring buffer private data */
 431         struct lttng_metadata_cache *metadata_cache;
 432         unsigned int metadata_in;       /* Bytes read from the cache */
 433         unsigned int metadata_out;      /* Bytes consumed from stream */
 434         int finalized;                  /* Has channel been finalized */
 435         wait_queue_head_t read_wait;    /* Reader buffer-level wait queue */
 436         struct list_head list;          /* Stream list */
 437         struct lttng_transport *transport;
 438         uint64_t version;               /* Current version of the metadata cache */
 439 };
 440
 441
 442 /*
 443  * struct lttng_pid_tracker declared in header due to deferencing of *v
 444  * in RCU_INITIALIZER(v).
 445  */
 446 #define LTTNG_PID_HASH_BITS     6
 447 #define LTTNG_PID_TABLE_SIZE    (1 << LTTNG_PID_HASH_BITS)
 448
 449 struct lttng_pid_tracker {
 450         struct hlist_head pid_hash[LTTNG_PID_TABLE_SIZE];
 451 };
 452
 453 struct lttng_pid_hash_node {
 454         struct hlist_node hlist;
 455         int pid;
 456 };
 457
 458 struct lttng_session {
 459         int active;                     /* Is trace session active ? */
 460         int been_active;                /* Has trace session been active ? */
 461         struct file *file;              /* File associated to session */
 462         struct list_head chan;          /* Channel list head */
 463         struct list_head events;        /* Event list head */
 464         struct list_head list;          /* Session list */
 465         unsigned int free_chan_id;      /* Next chan ID to allocate */
 466         uuid_le uuid;                   /* Trace session unique ID */
 467         struct lttng_metadata_cache *metadata_cache;
 468         struct lttng_pid_tracker *pid_tracker;
 469         unsigned int metadata_dumped:1,
 470                 tstate:1;               /* Transient enable state */
 471         /* List of enablers */
 472         struct list_head enablers_head;
 473         /* Hash table of events */
 474         struct lttng_event_ht events_ht;
 475 };
 476
 477 struct lttng_metadata_cache {
 478         char *data;                     /* Metadata cache */
 479         unsigned int cache_alloc;       /* Metadata allocated size (bytes) */
 480         unsigned int metadata_written;  /* Number of bytes written in metadata cache */
 481         struct kref refcount;           /* Metadata cache usage */
 482         struct list_head metadata_stream;       /* Metadata stream list */
 483         uuid_le uuid;                   /* Trace session unique ID (copy) */
 484         struct mutex lock;              /* Produce/consume lock */
 485         uint64_t version;               /* Current version of the metadata */
 486 };
 487
 488 void lttng_lock_sessions(void);
 489 void lttng_unlock_sessions(void);
 490
 491 struct list_head *lttng_get_probe_list_head(void);
 492
 493 struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type,
 494                 struct lttng_kernel_event *event_param,
 495                 struct lttng_channel *chan);
 496
 497 int lttng_enabler_enable(struct lttng_enabler *enabler);
 498 int lttng_enabler_disable(struct lttng_enabler *enabler);
 499 int lttng_fix_pending_events(void);
 500 int lttng_session_active(void);
 501
 502 struct lttng_session *lttng_session_create(void);
 503 int lttng_session_enable(struct lttng_session *session);
 504 int lttng_session_disable(struct lttng_session *session);
 505 void lttng_session_destroy(struct lttng_session *session);
 506 int lttng_session_metadata_regenerate(struct lttng_session *session);
 507 void metadata_cache_destroy(struct kref *kref);
 508
 509 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
 510                                        const char *transport_name,
 511                                        void *buf_addr,
 512                                        size_t subbuf_size, size_t num_subbuf,
 513                                        unsigned int switch_timer_interval,
 514                                        unsigned int read_timer_interval,
 515                                        enum channel_type channel_type);
 516 struct lttng_channel *lttng_global_channel_create(struct lttng_session *session,
 517                                        int overwrite, void *buf_addr,
 518                                        size_t subbuf_size, size_t num_subbuf,
 519                                        unsigned int switch_timer_interval,
 520                                        unsigned int read_timer_interval);
 521
 522 void lttng_metadata_channel_destroy(struct lttng_channel *chan);
 523 struct lttng_event *lttng_event_create(struct lttng_channel *chan,
 524                                 struct lttng_kernel_event *event_param,
 525                                 void *filter,
 526                                 const struct lttng_event_desc *event_desc,
 527                                 enum lttng_kernel_instrumentation itype);
 528 struct lttng_event *_lttng_event_create(struct lttng_channel *chan,
 529                                 struct lttng_kernel_event *event_param,
 530                                 void *filter,
 531                                 const struct lttng_event_desc *event_desc,
 532                                 enum lttng_kernel_instrumentation itype);
 533 struct lttng_event *lttng_event_compat_old_create(struct lttng_channel *chan,
 534                 struct lttng_kernel_old_event *old_event_param,
 535                 void *filter,
 536                 const struct lttng_event_desc *internal_desc);
 537
 538 int lttng_channel_enable(struct lttng_channel *channel);
 539 int lttng_channel_disable(struct lttng_channel *channel);
 540 int lttng_event_enable(struct lttng_event *event);
 541 int lttng_event_disable(struct lttng_event *event);
 542
 543 void lttng_transport_register(struct lttng_transport *transport);
 544 void lttng_transport_unregister(struct lttng_transport *transport);
 545
 546 void synchronize_trace(void);
 547 int lttng_abi_init(void);
 548 int lttng_abi_compat_old_init(void);
 549 void lttng_abi_exit(void);
 550 void lttng_abi_compat_old_exit(void);
 551
 552 int lttng_probe_register(struct lttng_probe_desc *desc);
 553 void lttng_probe_unregister(struct lttng_probe_desc *desc);
 554 const struct lttng_event_desc *lttng_event_get(const char *name);
 555 void lttng_event_put(const struct lttng_event_desc *desc);
 556 int lttng_probes_init(void);
 557 void lttng_probes_exit(void);
 558
 559 int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
 560                 struct channel *chan);
 561
 562 int lttng_pid_tracker_get_node_pid(const struct lttng_pid_hash_node *node);
 563 struct lttng_pid_tracker *lttng_pid_tracker_create(void);
 564 void lttng_pid_tracker_destroy(struct lttng_pid_tracker *lpf);
 565 bool lttng_pid_tracker_lookup(struct lttng_pid_tracker *lpf, int pid);
 566 int lttng_pid_tracker_add(struct lttng_pid_tracker *lpf, int pid);
 567 int lttng_pid_tracker_del(struct lttng_pid_tracker *lpf, int pid);
 568
 569 int lttng_session_track_pid(struct lttng_session *session, int pid);
 570 int lttng_session_untrack_pid(struct lttng_session *session, int pid);
 571
 572 int lttng_session_list_tracker_pids(struct lttng_session *session);
 573
 574 void lttng_clock_ref(void);
 575 void lttng_clock_unref(void);
 576
 577 #if defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
 578 int lttng_syscalls_register(struct lttng_channel *chan, void *filter);
 579 int lttng_syscalls_unregister(struct lttng_channel *chan);
 580 int lttng_syscall_filter_enable(struct lttng_channel *chan,
 581                 const char *name);
 582 int lttng_syscall_filter_disable(struct lttng_channel *chan,
 583                 const char *name);
 584 long lttng_channel_syscall_mask(struct lttng_channel *channel,
 585                 struct lttng_kernel_syscall_mask __user *usyscall_mask);
 586 #else
 587 static inline int lttng_syscalls_register(struct lttng_channel *chan, void *filter)
 588 {
 589         return -ENOSYS;
 590 }
 591
 592 static inline int lttng_syscalls_unregister(struct lttng_channel *chan)
 593 {
 594         return 0;
 595 }
 596
 597 static inline int lttng_syscall_filter_enable(struct lttng_channel *chan,
 598                 const char *name)
 599 {
 600         return -ENOSYS;
 601 }
 602
 603 static inline int lttng_syscall_filter_disable(struct lttng_channel *chan,
 604                 const char *name)
 605 {
 606         return -ENOSYS;
 607 }
 608
 609 static inline long lttng_channel_syscall_mask(struct lttng_channel *channel,
 610                 struct lttng_kernel_syscall_mask __user *usyscall_mask)
 611 {
 612         return -ENOSYS;
 613 }
 614 #endif
 615
 616 void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime);
 617 int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler,
 618                 struct lttng_kernel_filter_bytecode __user *bytecode);
 619 void lttng_enabler_event_link_bytecode(struct lttng_event *event,
 620                 struct lttng_enabler *enabler);
 621
 622 extern struct lttng_ctx *lttng_static_ctx;
 623
 624 int lttng_context_init(void);
 625 void lttng_context_exit(void);
 626 struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx);
 627 void lttng_context_update(struct lttng_ctx *ctx);
 628 int lttng_find_context(struct lttng_ctx *ctx, const char *name);
 629 int lttng_get_context_index(struct lttng_ctx *ctx, const char *name);
 630 void lttng_remove_context_field(struct lttng_ctx **ctx,
 631                                 struct lttng_ctx_field *field);
 632 void lttng_destroy_context(struct lttng_ctx *ctx);
 633 int lttng_add_pid_to_ctx(struct lttng_ctx **ctx);
 634 int lttng_add_cpu_id_to_ctx(struct lttng_ctx **ctx);
 635 int lttng_add_procname_to_ctx(struct lttng_ctx **ctx);
 636 int lttng_add_prio_to_ctx(struct lttng_ctx **ctx);
 637 int lttng_add_nice_to_ctx(struct lttng_ctx **ctx);
 638 int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
 639 int lttng_add_tid_to_ctx(struct lttng_ctx **ctx);
 640 int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
 641 int lttng_add_ppid_to_ctx(struct lttng_ctx **ctx);
 642 int lttng_add_vppid_to_ctx(struct lttng_ctx **ctx);
 643 int lttng_add_hostname_to_ctx(struct lttng_ctx **ctx);
 644 int lttng_add_interruptible_to_ctx(struct lttng_ctx **ctx);
 645 int lttng_add_need_reschedule_to_ctx(struct lttng_ctx **ctx);
 646 #if defined(CONFIG_PREEMPT_RT_FULL) || defined(CONFIG_PREEMPT)
 647 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx);
 648 #else
 649 static inline
 650 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx)
 651 {
 652         return -ENOSYS;
 653 }
 654 #endif
 655 #ifdef CONFIG_PREEMPT_RT_FULL
 656 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx);
 657 #else
 658 static inline
 659 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx)
 660 {
 661         return -ENOSYS;
 662 }
 663 #endif
 664 #if defined(CONFIG_PERF_EVENTS) && (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33))
 665 int lttng_add_perf_counter_to_ctx(uint32_t type,
 666                                   uint64_t config,
 667                                   const char *name,
 668                                   struct lttng_ctx **ctx);
 669 int lttng_cpuhp_perf_counter_online(unsigned int cpu,
 670                 struct lttng_cpuhp_node *node);
 671 int lttng_cpuhp_perf_counter_dead(unsigned int cpu,
 672                 struct lttng_cpuhp_node *node);
 673 #else
 674 static inline
 675 int lttng_add_perf_counter_to_ctx(uint32_t type,
 676                                   uint64_t config,
 677                                   const char *name,
 678                                   struct lttng_ctx **ctx)
 679 {
 680         return -ENOSYS;
 681 }
 682 static inline
 683 int lttng_cpuhp_perf_counter_online(unsigned int cpu,
 684                 struct lttng_cpuhp_node *node)
 685 {
 686         return 0;
 687 }
 688 static inline
 689 int lttng_cpuhp_perf_counter_dead(unsigned int cpu,
 690                 struct lttng_cpuhp_node *node)
 691 {
 692         return 0;
 693 }
 694 #endif
 695
 696 int lttng_logger_init(void);
 697 void lttng_logger_exit(void);
 698
 699 extern int lttng_statedump_start(struct lttng_session *session);
 700
 701 #ifdef CONFIG_KPROBES
 702 int lttng_kprobes_register(const char *name,
 703                 const char *symbol_name,
 704                 uint64_t offset,
 705                 uint64_t addr,
 706                 struct lttng_event *event);
 707 void lttng_kprobes_unregister(struct lttng_event *event);
 708 void lttng_kprobes_destroy_private(struct lttng_event *event);
 709 #else
 710 static inline
 711 int lttng_kprobes_register(const char *name,
 712                 const char *symbol_name,
 713                 uint64_t offset,
 714                 uint64_t addr,
 715                 struct lttng_event *event)
 716 {
 717         return -ENOSYS;
 718 }
 719
 720 static inline
 721 void lttng_kprobes_unregister(struct lttng_event *event)
 722 {
 723 }
 724
 725 static inline
 726 void lttng_kprobes_destroy_private(struct lttng_event *event)
 727 {
 728 }
 729 #endif
 730
 731 #ifdef CONFIG_KRETPROBES
 732 int lttng_kretprobes_register(const char *name,
 733                 const char *symbol_name,
 734                 uint64_t offset,
 735                 uint64_t addr,
 736                 struct lttng_event *event_entry,
 737                 struct lttng_event *event_exit);
 738 void lttng_kretprobes_unregister(struct lttng_event *event);
 739 void lttng_kretprobes_destroy_private(struct lttng_event *event);
 740 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
 741         int enable);
 742 #else
 743 static inline
 744 int lttng_kretprobes_register(const char *name,
 745                 const char *symbol_name,
 746                 uint64_t offset,
 747                 uint64_t addr,
 748                 struct lttng_event *event_entry,
 749                 struct lttng_event *event_exit)
 750 {
 751         return -ENOSYS;
 752 }
 753
 754 static inline
 755 void lttng_kretprobes_unregister(struct lttng_event *event)
 756 {
 757 }
 758
 759 static inline
 760 void lttng_kretprobes_destroy_private(struct lttng_event *event)
 761 {
 762 }
 763
 764 static inline
 765 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
 766         int enable)
 767 {
 768         return -ENOSYS;
 769 }
 770 #endif
 771
 772 #if defined(CONFIG_DYNAMIC_FTRACE) && !defined(LTTNG_FTRACE_MISSING_HEADER)
 773 int lttng_ftrace_register(const char *name,
 774                           const char *symbol_name,
 775                           struct lttng_event *event);
 776 void lttng_ftrace_unregister(struct lttng_event *event);
 777 void lttng_ftrace_destroy_private(struct lttng_event *event);
 778 #else
 779 static inline
 780 int lttng_ftrace_register(const char *name,
 781                           const char *symbol_name,
 782                           struct lttng_event *event)
 783 {
 784         return -ENOSYS;
 785 }
 786
 787 static inline
 788 void lttng_ftrace_unregister(struct lttng_event *event)
 789 {
 790 }
 791
 792 static inline
 793 void lttng_ftrace_destroy_private(struct lttng_event *event)
 794 {
 795 }
 796 #endif
 797
 798 int lttng_calibrate(struct lttng_kernel_calibrate *calibrate);
 799
 800 extern const struct file_operations lttng_tracepoint_list_fops;
 801 extern const struct file_operations lttng_syscall_list_fops;
 802
 803 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35))
 804 #define TRACEPOINT_HAS_DATA_ARG
 805 #endif
 806
 807 #endif /* _LTTNG_EVENTS_H */