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 <wrapper/uuid.h>
  31 #include <lttng-abi.h>
  32 #include <lttng-abi-old.h>
  33
  34 #define lttng_is_signed_type(type)      (((type)(-1)) < 0)
  35
  36 struct lttng_channel;
  37 struct lttng_session;
  38 struct lttng_metadata_cache;
  39 struct lib_ring_buffer_ctx;
  40 struct perf_event;
  41 struct perf_event_attr;
  42 struct lib_ring_buffer_config;
  43
  44 /* Type description */
  45
  46 enum abstract_types {
  47         atype_integer,
  48         atype_enum,
  49         atype_array,
  50         atype_sequence,
  51         atype_string,
  52         atype_struct,
  53         atype_array_compound,           /* Array of compound types. */
  54         atype_sequence_compound,        /* Sequence of compound types. */
  55         atype_variant,
  56         NR_ABSTRACT_TYPES,
  57 };
  58
  59 enum lttng_string_encodings {
  60         lttng_encode_none = 0,
  61         lttng_encode_UTF8 = 1,
  62         lttng_encode_ASCII = 2,
  63         NR_STRING_ENCODINGS,
  64 };
  65
  66 enum channel_type {
  67         PER_CPU_CHANNEL,
  68         METADATA_CHANNEL,
  69 };
  70
  71 struct lttng_enum_entry {
  72         unsigned long long start, end;  /* start and end are inclusive */
  73         const char *string;
  74 };
  75
  76 #define __type_integer(_type, _size, _alignment, _signedness,   \
  77                 _byte_order, _base, _encoding)  \
  78         {                                                       \
  79             .atype = atype_integer,                             \
  80             .u.basic.integer =                                  \
  81                 {                                               \
  82                   .size = (_size) ? : sizeof(_type) * CHAR_BIT, \
  83                   .alignment = (_alignment) ? : lttng_alignof(_type) * CHAR_BIT, \
  84                   .signedness = (_signedness) >= 0 ? (_signedness) : lttng_is_signed_type(_type), \
  85                   .reverse_byte_order = _byte_order != __BYTE_ORDER, \
  86                   .base = _base,                                \
  87                   .encoding = lttng_encode_##_encoding,         \
  88                 },                                              \
  89         }                                                       \
  90
  91 struct lttng_integer_type {
  92         unsigned int size;              /* in bits */
  93         unsigned short alignment;       /* in bits */
  94         unsigned int signedness:1,
  95                 reverse_byte_order:1;
  96         unsigned int base;              /* 2, 8, 10, 16, for pretty print */
  97         enum lttng_string_encodings encoding;
  98 };
  99
 100 union _lttng_basic_type {
 101         struct lttng_integer_type integer;
 102         struct {
 103                 const char *name;
 104         } enumeration;
 105         struct {
 106                 enum lttng_string_encodings encoding;
 107         } string;
 108 };
 109
 110 struct lttng_basic_type {
 111         enum abstract_types atype;
 112         union {
 113                 union _lttng_basic_type basic;
 114         } u;
 115 };
 116
 117 struct lttng_type {
 118         enum abstract_types atype;
 119         union {
 120                 union _lttng_basic_type basic;
 121                 struct {
 122                         struct lttng_basic_type elem_type;
 123                         unsigned int length;            /* num. elems. */
 124                         unsigned int elem_alignment;    /* alignment override */
 125                 } array;
 126                 struct {
 127                         struct lttng_basic_type length_type;
 128                         struct lttng_basic_type elem_type;
 129                         unsigned int elem_alignment;    /* alignment override */
 130                 } sequence;
 131                 struct {
 132                         uint32_t nr_fields;
 133                         struct lttng_event_field *fields; /* Array of fields. */
 134                 } _struct;
 135                 struct {
 136                         struct lttng_type *elem_type;
 137                         unsigned int length;            /* num. elems. */
 138                 } array_compound;
 139                 struct {
 140                         struct lttng_type *elem_type;
 141                         const char *length_name;
 142                 } sequence_compound;
 143                 struct {
 144                         const char *tag_name;
 145                         struct lttng_event_field *choices; /* Array of fields. */
 146                         uint32_t nr_choices;
 147                 } variant;
 148         } u;
 149 };
 150
 151 struct lttng_enum {
 152         const char *name;
 153         struct lttng_type container_type;
 154         const struct lttng_enum_entry *entries;
 155         unsigned int len;
 156 };
 157
 158 /* Event field description */
 159
 160 struct lttng_event_field {
 161         const char *name;
 162         struct lttng_type type;
 163         unsigned int nowrite:1,         /* do not write into trace */
 164                         user:1;         /* fetch from user-space */
 165 };
 166
 167 union lttng_ctx_value {
 168         int64_t s64;
 169         const char *str;
 170         double d;
 171 };
 172
 173 /*
 174  * We need to keep this perf counter field separately from struct
 175  * lttng_ctx_field because cpu hotplug needs fixed-location addresses.
 176  */
 177 struct lttng_perf_counter_field {
 178         struct notifier_block nb;
 179         int hp_enable;
 180         struct perf_event_attr *attr;
 181         struct perf_event **e;  /* per-cpu array */
 182 };
 183
 184 struct lttng_probe_ctx {
 185         struct lttng_event *event;
 186         uint8_t interruptible;
 187 };
 188
 189 struct lttng_ctx_field {
 190         struct lttng_event_field event_field;
 191         size_t (*get_size)(size_t offset);
 192         void (*record)(struct lttng_ctx_field *field,
 193                        struct lib_ring_buffer_ctx *ctx,
 194                        struct lttng_channel *chan);
 195         void (*get_value)(struct lttng_ctx_field *field,
 196                          struct lttng_probe_ctx *lttng_probe_ctx,
 197                          union lttng_ctx_value *value);
 198         union {
 199                 struct lttng_perf_counter_field *perf_counter;
 200         } u;
 201         void (*destroy)(struct lttng_ctx_field *field);
 202 };
 203
 204 struct lttng_ctx {
 205         struct lttng_ctx_field *fields;
 206         unsigned int nr_fields;
 207         unsigned int allocated_fields;
 208         size_t largest_align;   /* in bytes */
 209 };
 210
 211 struct lttng_event_desc {
 212         const char *name;               /* lttng-modules name */
 213         const char *kname;              /* Linux kernel name (tracepoints) */
 214         void *probe_callback;
 215         const struct lttng_event_ctx *ctx;      /* context */
 216         const struct lttng_event_field *fields; /* event payload */
 217         unsigned int nr_fields;
 218         struct module *owner;
 219 };
 220
 221 struct lttng_probe_desc {
 222         const char *provider;
 223         const struct lttng_event_desc **event_desc;
 224         unsigned int nr_events;
 225         struct list_head head;                  /* chain registered probes */
 226         struct list_head lazy_init_head;
 227         int lazy;                               /* lazy registration */
 228 };
 229
 230 struct lttng_krp;                               /* Kretprobe handling */
 231
 232 enum lttng_event_type {
 233         LTTNG_TYPE_EVENT = 0,
 234         LTTNG_TYPE_ENABLER = 1,
 235 };
 236
 237 struct lttng_filter_bytecode_node {
 238         struct list_head node;
 239         struct lttng_enabler *enabler;
 240         /*
 241          * struct lttng_kernel_filter_bytecode has var. sized array, must be
 242          * last field.
 243          */
 244         struct lttng_kernel_filter_bytecode bc;
 245 };
 246
 247 /*
 248  * Filter return value masks.
 249  */
 250 enum lttng_filter_ret {
 251         LTTNG_FILTER_DISCARD = 0,
 252         LTTNG_FILTER_RECORD_FLAG = (1ULL << 0),
 253         /* Other bits are kept for future use. */
 254 };
 255
 256 struct lttng_bytecode_runtime {
 257         /* Associated bytecode */
 258         struct lttng_filter_bytecode_node *bc;
 259         uint64_t (*filter)(void *filter_data, struct lttng_probe_ctx *lttng_probe_ctx,
 260                         const char *filter_stack_data);
 261         int link_failed;
 262         struct list_head node;  /* list of bytecode runtime in event */
 263 };
 264
 265 /*
 266  * Objects in a linked-list of enablers, owned by an event.
 267  */
 268 struct lttng_enabler_ref {
 269         struct list_head node;                  /* enabler ref list */
 270         struct lttng_enabler *ref;              /* backward ref */
 271 };
 272
 273 /*
 274  * lttng_event structure is referred to by the tracing fast path. It must be
 275  * kept small.
 276  */
 277 struct lttng_event {
 278         enum lttng_event_type evtype;   /* First field. */
 279         unsigned int id;
 280         struct lttng_channel *chan;
 281         int enabled;
 282         const struct lttng_event_desc *desc;
 283         void *filter;
 284         struct lttng_ctx *ctx;
 285         enum lttng_kernel_instrumentation instrumentation;
 286         union {
 287                 struct {
 288                         struct kprobe kp;
 289                         char *symbol_name;
 290                 } kprobe;
 291                 struct {
 292                         struct lttng_krp *lttng_krp;
 293                         char *symbol_name;
 294                 } kretprobe;
 295                 struct {
 296                         char *symbol_name;
 297                 } ftrace;
 298         } u;
 299         struct list_head list;          /* Event list in session */
 300         unsigned int metadata_dumped:1;
 301
 302         /* Backward references: list of lttng_enabler_ref (ref to enablers) */
 303         struct list_head enablers_ref_head;
 304         struct hlist_node hlist;        /* session ht of events */
 305         int registered;                 /* has reg'd tracepoint probe */
 306         /* list of struct lttng_bytecode_runtime, sorted by seqnum */
 307         struct list_head bytecode_runtime_head;
 308         int has_enablers_without_bytecode;
 309 };
 310
 311 enum lttng_enabler_type {
 312         LTTNG_ENABLER_WILDCARD,
 313         LTTNG_ENABLER_NAME,
 314 };
 315
 316 /*
 317  * Enabler field, within whatever object is enabling an event. Target of
 318  * backward reference.
 319  */
 320 struct lttng_enabler {
 321         enum lttng_event_type evtype;   /* First field. */
 322
 323         enum lttng_enabler_type type;
 324
 325         struct list_head node;  /* per-session list of enablers */
 326         /* head list of struct lttng_ust_filter_bytecode_node */
 327         struct list_head filter_bytecode_head;
 328
 329         struct lttng_kernel_event event_param;
 330         struct lttng_channel *chan;
 331         struct lttng_ctx *ctx;
 332         unsigned int enabled:1;
 333 };
 334
 335 struct lttng_channel_ops {
 336         struct channel *(*channel_create)(const char *name,
 337                                 struct lttng_channel *lttng_chan,
 338                                 void *buf_addr,
 339                                 size_t subbuf_size, size_t num_subbuf,
 340                                 unsigned int switch_timer_interval,
 341                                 unsigned int read_timer_interval);
 342         void (*channel_destroy)(struct channel *chan);
 343         struct lib_ring_buffer *(*buffer_read_open)(struct channel *chan);
 344         int (*buffer_has_read_closed_stream)(struct channel *chan);
 345         void (*buffer_read_close)(struct lib_ring_buffer *buf);
 346         int (*event_reserve)(struct lib_ring_buffer_ctx *ctx,
 347                              uint32_t event_id);
 348         void (*event_commit)(struct lib_ring_buffer_ctx *ctx);
 349         void (*event_write)(struct lib_ring_buffer_ctx *ctx, const void *src,
 350                             size_t len);
 351         void (*event_write_from_user)(struct lib_ring_buffer_ctx *ctx,
 352                                       const void *src, size_t len);
 353         void (*event_memset)(struct lib_ring_buffer_ctx *ctx,
 354                              int c, size_t len);
 355         void (*event_strcpy)(struct lib_ring_buffer_ctx *ctx, const char *src,
 356                              size_t len);
 357         void (*event_strcpy_from_user)(struct lib_ring_buffer_ctx *ctx,
 358                                        const char __user *src, size_t len);
 359         /*
 360          * packet_avail_size returns the available size in the current
 361          * packet. Note that the size returned is only a hint, since it
 362          * may change due to concurrent writes.
 363          */
 364         size_t (*packet_avail_size)(struct channel *chan);
 365         wait_queue_head_t *(*get_writer_buf_wait_queue)(struct channel *chan, int cpu);
 366         wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
 367         int (*is_finalized)(struct channel *chan);
 368         int (*is_disabled)(struct channel *chan);
 369         int (*timestamp_begin) (const struct lib_ring_buffer_config *config,
 370                         struct lib_ring_buffer *bufb,
 371                         uint64_t *timestamp_begin);
 372         int (*timestamp_end) (const struct lib_ring_buffer_config *config,
 373                         struct lib_ring_buffer *bufb,
 374                         uint64_t *timestamp_end);
 375         int (*events_discarded) (const struct lib_ring_buffer_config *config,
 376                         struct lib_ring_buffer *bufb,
 377                         uint64_t *events_discarded);
 378         int (*content_size) (const struct lib_ring_buffer_config *config,
 379                         struct lib_ring_buffer *bufb,
 380                         uint64_t *content_size);
 381         int (*packet_size) (const struct lib_ring_buffer_config *config,
 382                         struct lib_ring_buffer *bufb,
 383                         uint64_t *packet_size);
 384         int (*stream_id) (const struct lib_ring_buffer_config *config,
 385                         struct lib_ring_buffer *bufb,
 386                         uint64_t *stream_id);
 387         int (*current_timestamp) (const struct lib_ring_buffer_config *config,
 388                         struct lib_ring_buffer *bufb,
 389                         uint64_t *ts);
 390         int (*sequence_number) (const struct lib_ring_buffer_config *config,
 391                         struct lib_ring_buffer *bufb,
 392                         uint64_t *seq);
 393         int (*instance_id) (const struct lib_ring_buffer_config *config,
 394                         struct lib_ring_buffer *bufb,
 395                         uint64_t *id);
 396 };
 397
 398 struct lttng_transport {
 399         char *name;
 400         struct module *owner;
 401         struct list_head node;
 402         struct lttng_channel_ops ops;
 403 };
 404
 405 struct lttng_syscall_filter;
 406
 407 #define LTTNG_EVENT_HT_BITS             12
 408 #define LTTNG_EVENT_HT_SIZE             (1U << LTTNG_EVENT_HT_BITS)
 409
 410 struct lttng_event_ht {
 411         struct hlist_head table[LTTNG_EVENT_HT_SIZE];
 412 };
 413
 414 struct lttng_channel {
 415         unsigned int id;
 416         struct channel *chan;           /* Channel buffers */
 417         int enabled;
 418         struct lttng_ctx *ctx;
 419         /* Event ID management */
 420         struct lttng_session *session;
 421         struct file *file;              /* File associated to channel */
 422         unsigned int free_event_id;     /* Next event ID to allocate */
 423         struct list_head list;          /* Channel list */
 424         struct lttng_channel_ops *ops;
 425         struct lttng_transport *transport;
 426         struct lttng_event **sc_table;  /* for syscall tracing */
 427         struct lttng_event **compat_sc_table;
 428         struct lttng_event **sc_exit_table;     /* for syscall exit tracing */
 429         struct lttng_event **compat_sc_exit_table;
 430         struct lttng_event *sc_unknown; /* for unknown syscalls */
 431         struct lttng_event *sc_compat_unknown;
 432         struct lttng_event *sc_exit_unknown;
 433         struct lttng_event *compat_sc_exit_unknown;
 434         struct lttng_syscall_filter *sc_filter;
 435         int header_type;                /* 0: unset, 1: compact, 2: large */
 436         enum channel_type channel_type;
 437         unsigned int metadata_dumped:1,
 438                 sys_enter_registered:1,
 439                 sys_exit_registered:1,
 440                 syscall_all:1,
 441                 tstate:1;               /* Transient enable state */
 442 };
 443
 444 struct lttng_metadata_stream {
 445         void *priv;                     /* Ring buffer private data */
 446         struct lttng_metadata_cache *metadata_cache;
 447         unsigned int metadata_in;       /* Bytes read from the cache */
 448         unsigned int metadata_out;      /* Bytes consumed from stream */
 449         int finalized;                  /* Has channel been finalized */
 450         wait_queue_head_t read_wait;    /* Reader buffer-level wait queue */
 451         struct list_head list;          /* Stream list */
 452         struct lttng_transport *transport;
 453         uint64_t version;               /* Current version of the metadata cache */
 454 };
 455
 456 #define LTTNG_DYNAMIC_LEN_STACK_SIZE    128
 457
 458 struct lttng_dynamic_len_stack {
 459         size_t stack[LTTNG_DYNAMIC_LEN_STACK_SIZE];
 460         size_t offset;
 461 };
 462
 463 DECLARE_PER_CPU(struct lttng_dynamic_len_stack, lttng_dynamic_len_stack);
 464
 465 /*
 466  * struct lttng_pid_tracker declared in header due to deferencing of *v
 467  * in RCU_INITIALIZER(v).
 468  */
 469 #define LTTNG_PID_HASH_BITS     6
 470 #define LTTNG_PID_TABLE_SIZE    (1 << LTTNG_PID_HASH_BITS)
 471
 472 struct lttng_pid_tracker {
 473         struct hlist_head pid_hash[LTTNG_PID_TABLE_SIZE];
 474 };
 475
 476 struct lttng_pid_hash_node {
 477         struct hlist_node hlist;
 478         int pid;
 479 };
 480
 481 struct lttng_session {
 482         int active;                     /* Is trace session active ? */
 483         int been_active;                /* Has trace session been active ? */
 484         struct file *file;              /* File associated to session */
 485         struct list_head chan;          /* Channel list head */
 486         struct list_head events;        /* Event list head */
 487         struct list_head list;          /* Session list */
 488         unsigned int free_chan_id;      /* Next chan ID to allocate */
 489         uuid_le uuid;                   /* Trace session unique ID */
 490         struct lttng_metadata_cache *metadata_cache;
 491         struct lttng_pid_tracker *pid_tracker;
 492         unsigned int metadata_dumped:1,
 493                 tstate:1;               /* Transient enable state */
 494         /* List of enablers */
 495         struct list_head enablers_head;
 496         /* Hash table of events */
 497         struct lttng_event_ht events_ht;
 498 };
 499
 500 struct lttng_metadata_cache {
 501         char *data;                     /* Metadata cache */
 502         unsigned int cache_alloc;       /* Metadata allocated size (bytes) */
 503         unsigned int metadata_written;  /* Number of bytes written in metadata cache */
 504         struct kref refcount;           /* Metadata cache usage */
 505         struct list_head metadata_stream;       /* Metadata stream list */
 506         uuid_le uuid;                   /* Trace session unique ID (copy) */
 507         struct mutex lock;              /* Produce/consume lock */
 508         uint64_t version;               /* Current version of the metadata */
 509 };
 510
 511 void lttng_lock_sessions(void);
 512 void lttng_unlock_sessions(void);
 513
 514 struct list_head *lttng_get_probe_list_head(void);
 515
 516 struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type,
 517                 struct lttng_kernel_event *event_param,
 518                 struct lttng_channel *chan);
 519
 520 int lttng_enabler_enable(struct lttng_enabler *enabler);
 521 int lttng_enabler_disable(struct lttng_enabler *enabler);
 522 int lttng_fix_pending_events(void);
 523 int lttng_session_active(void);
 524
 525 struct lttng_session *lttng_session_create(void);
 526 int lttng_session_enable(struct lttng_session *session);
 527 int lttng_session_disable(struct lttng_session *session);
 528 void lttng_session_destroy(struct lttng_session *session);
 529 int lttng_session_metadata_regenerate(struct lttng_session *session);
 530 void metadata_cache_destroy(struct kref *kref);
 531
 532 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
 533                                        const char *transport_name,
 534                                        void *buf_addr,
 535                                        size_t subbuf_size, size_t num_subbuf,
 536                                        unsigned int switch_timer_interval,
 537                                        unsigned int read_timer_interval,
 538                                        enum channel_type channel_type);
 539 struct lttng_channel *lttng_global_channel_create(struct lttng_session *session,
 540                                        int overwrite, void *buf_addr,
 541                                        size_t subbuf_size, size_t num_subbuf,
 542                                        unsigned int switch_timer_interval,
 543                                        unsigned int read_timer_interval);
 544
 545 void lttng_metadata_channel_destroy(struct lttng_channel *chan);
 546 struct lttng_event *lttng_event_create(struct lttng_channel *chan,
 547                                 struct lttng_kernel_event *event_param,
 548                                 void *filter,
 549                                 const struct lttng_event_desc *event_desc,
 550                                 enum lttng_kernel_instrumentation itype);
 551 struct lttng_event *_lttng_event_create(struct lttng_channel *chan,
 552                                 struct lttng_kernel_event *event_param,
 553                                 void *filter,
 554                                 const struct lttng_event_desc *event_desc,
 555                                 enum lttng_kernel_instrumentation itype);
 556 struct lttng_event *lttng_event_compat_old_create(struct lttng_channel *chan,
 557                 struct lttng_kernel_old_event *old_event_param,
 558                 void *filter,
 559                 const struct lttng_event_desc *internal_desc);
 560
 561 int lttng_channel_enable(struct lttng_channel *channel);
 562 int lttng_channel_disable(struct lttng_channel *channel);
 563 int lttng_event_enable(struct lttng_event *event);
 564 int lttng_event_disable(struct lttng_event *event);
 565
 566 void lttng_transport_register(struct lttng_transport *transport);
 567 void lttng_transport_unregister(struct lttng_transport *transport);
 568
 569 void synchronize_trace(void);
 570 int lttng_abi_init(void);
 571 int lttng_abi_compat_old_init(void);
 572 void lttng_abi_exit(void);
 573 void lttng_abi_compat_old_exit(void);
 574
 575 int lttng_probe_register(struct lttng_probe_desc *desc);
 576 void lttng_probe_unregister(struct lttng_probe_desc *desc);
 577 const struct lttng_event_desc *lttng_event_get(const char *name);
 578 void lttng_event_put(const struct lttng_event_desc *desc);
 579 int lttng_probes_init(void);
 580 void lttng_probes_exit(void);
 581
 582 int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
 583                 struct channel *chan);
 584
 585 int lttng_pid_tracker_get_node_pid(const struct lttng_pid_hash_node *node);
 586 struct lttng_pid_tracker *lttng_pid_tracker_create(void);
 587 void lttng_pid_tracker_destroy(struct lttng_pid_tracker *lpf);
 588 bool lttng_pid_tracker_lookup(struct lttng_pid_tracker *lpf, int pid);
 589 int lttng_pid_tracker_add(struct lttng_pid_tracker *lpf, int pid);
 590 int lttng_pid_tracker_del(struct lttng_pid_tracker *lpf, int pid);
 591
 592 int lttng_session_track_pid(struct lttng_session *session, int pid);
 593 int lttng_session_untrack_pid(struct lttng_session *session, int pid);
 594
 595 int lttng_session_list_tracker_pids(struct lttng_session *session);
 596
 597 void lttng_clock_ref(void);
 598 void lttng_clock_unref(void);
 599
 600 #if defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
 601 int lttng_syscalls_register(struct lttng_channel *chan, void *filter);
 602 int lttng_syscalls_unregister(struct lttng_channel *chan);
 603 int lttng_syscall_filter_enable(struct lttng_channel *chan,
 604                 const char *name);
 605 int lttng_syscall_filter_disable(struct lttng_channel *chan,
 606                 const char *name);
 607 long lttng_channel_syscall_mask(struct lttng_channel *channel,
 608                 struct lttng_kernel_syscall_mask __user *usyscall_mask);
 609 #else
 610 static inline int lttng_syscalls_register(struct lttng_channel *chan, void *filter)
 611 {
 612         return -ENOSYS;
 613 }
 614
 615 static inline int lttng_syscalls_unregister(struct lttng_channel *chan)
 616 {
 617         return 0;
 618 }
 619
 620 static inline int lttng_syscall_filter_enable(struct lttng_channel *chan,
 621                 const char *name)
 622 {
 623         return -ENOSYS;
 624 }
 625
 626 static inline int lttng_syscall_filter_disable(struct lttng_channel *chan,
 627                 const char *name)
 628 {
 629         return -ENOSYS;
 630 }
 631
 632 static inline long lttng_channel_syscall_mask(struct lttng_channel *channel,
 633                 struct lttng_kernel_syscall_mask __user *usyscall_mask)
 634 {
 635         return -ENOSYS;
 636 }
 637 #endif
 638
 639 void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime);
 640 int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler,
 641                 struct lttng_kernel_filter_bytecode __user *bytecode);
 642 void lttng_enabler_event_link_bytecode(struct lttng_event *event,
 643                 struct lttng_enabler *enabler);
 644
 645 int lttng_probes_init(void);
 646
 647 extern struct lttng_ctx *lttng_static_ctx;
 648
 649 int lttng_context_init(void);
 650 void lttng_context_exit(void);
 651 struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx);
 652 void lttng_context_update(struct lttng_ctx *ctx);
 653 int lttng_find_context(struct lttng_ctx *ctx, const char *name);
 654 int lttng_get_context_index(struct lttng_ctx *ctx, const char *name);
 655 void lttng_remove_context_field(struct lttng_ctx **ctx,
 656                                 struct lttng_ctx_field *field);
 657 void lttng_destroy_context(struct lttng_ctx *ctx);
 658 int lttng_add_pid_to_ctx(struct lttng_ctx **ctx);
 659 int lttng_add_cpu_id_to_ctx(struct lttng_ctx **ctx);
 660 int lttng_add_procname_to_ctx(struct lttng_ctx **ctx);
 661 int lttng_add_prio_to_ctx(struct lttng_ctx **ctx);
 662 int lttng_add_nice_to_ctx(struct lttng_ctx **ctx);
 663 int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
 664 int lttng_add_tid_to_ctx(struct lttng_ctx **ctx);
 665 int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
 666 int lttng_add_ppid_to_ctx(struct lttng_ctx **ctx);
 667 int lttng_add_vppid_to_ctx(struct lttng_ctx **ctx);
 668 int lttng_add_hostname_to_ctx(struct lttng_ctx **ctx);
 669 int lttng_add_interruptible_to_ctx(struct lttng_ctx **ctx);
 670 int lttng_add_need_reschedule_to_ctx(struct lttng_ctx **ctx);
 671 #if defined(CONFIG_PREEMPT_RT_FULL) || defined(CONFIG_PREEMPT)
 672 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx);
 673 #else
 674 static inline
 675 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx)
 676 {
 677         return -ENOSYS;
 678 }
 679 #endif
 680 #ifdef CONFIG_PREEMPT_RT_FULL
 681 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx);
 682 #else
 683 static inline
 684 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx)
 685 {
 686         return -ENOSYS;
 687 }
 688 #endif
 689 #if defined(CONFIG_PERF_EVENTS) && (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33))
 690 int lttng_add_perf_counter_to_ctx(uint32_t type,
 691                                   uint64_t config,
 692                                   const char *name,
 693                                   struct lttng_ctx **ctx);
 694 #else
 695 static inline
 696 int lttng_add_perf_counter_to_ctx(uint32_t type,
 697                                   uint64_t config,
 698                                   const char *name,
 699                                   struct lttng_ctx **ctx)
 700 {
 701         return -ENOSYS;
 702 }
 703 #endif
 704
 705 int lttng_logger_init(void);
 706 void lttng_logger_exit(void);
 707
 708 extern int lttng_statedump_start(struct lttng_session *session);
 709
 710 #ifdef CONFIG_KPROBES
 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 void lttng_kprobes_unregister(struct lttng_event *event);
 717 void lttng_kprobes_destroy_private(struct lttng_event *event);
 718 #else
 719 static inline
 720 int lttng_kprobes_register(const char *name,
 721                 const char *symbol_name,
 722                 uint64_t offset,
 723                 uint64_t addr,
 724                 struct lttng_event *event)
 725 {
 726         return -ENOSYS;
 727 }
 728
 729 static inline
 730 void lttng_kprobes_unregister(struct lttng_event *event)
 731 {
 732 }
 733
 734 static inline
 735 void lttng_kprobes_destroy_private(struct lttng_event *event)
 736 {
 737 }
 738 #endif
 739
 740 #ifdef CONFIG_KRETPROBES
 741 int lttng_kretprobes_register(const char *name,
 742                 const char *symbol_name,
 743                 uint64_t offset,
 744                 uint64_t addr,
 745                 struct lttng_event *event_entry,
 746                 struct lttng_event *event_exit);
 747 void lttng_kretprobes_unregister(struct lttng_event *event);
 748 void lttng_kretprobes_destroy_private(struct lttng_event *event);
 749 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
 750         int enable);
 751 #else
 752 static inline
 753 int lttng_kretprobes_register(const char *name,
 754                 const char *symbol_name,
 755                 uint64_t offset,
 756                 uint64_t addr,
 757                 struct lttng_event *event_entry,
 758                 struct lttng_event *event_exit)
 759 {
 760         return -ENOSYS;
 761 }
 762
 763 static inline
 764 void lttng_kretprobes_unregister(struct lttng_event *event)
 765 {
 766 }
 767
 768 static inline
 769 void lttng_kretprobes_destroy_private(struct lttng_event *event)
 770 {
 771 }
 772
 773 static inline
 774 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
 775         int enable)
 776 {
 777         return -ENOSYS;
 778 }
 779 #endif
 780
 781 #ifdef CONFIG_DYNAMIC_FTRACE
 782 int lttng_ftrace_register(const char *name,
 783                           const char *symbol_name,
 784                           struct lttng_event *event);
 785 void lttng_ftrace_unregister(struct lttng_event *event);
 786 void lttng_ftrace_destroy_private(struct lttng_event *event);
 787 #else
 788 static inline
 789 int lttng_ftrace_register(const char *name,
 790                           const char *symbol_name,
 791                           struct lttng_event *event)
 792 {
 793         return -ENOSYS;
 794 }
 795
 796 static inline
 797 void lttng_ftrace_unregister(struct lttng_event *event)
 798 {
 799 }
 800
 801 static inline
 802 void lttng_ftrace_destroy_private(struct lttng_event *event)
 803 {
 804 }
 805 #endif
 806
 807 int lttng_calibrate(struct lttng_kernel_calibrate *calibrate);
 808
 809 extern const struct file_operations lttng_tracepoint_list_fops;
 810 extern const struct file_operations lttng_syscall_list_fops;
 811
 812 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35))
 813 #define TRACEPOINT_HAS_DATA_ARG
 814 #endif
 815
 816 #endif /* _LTTNG_EVENTS_H */