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-tracer.h>
  33 #include <lttng-abi.h>
  34 #include <lttng-abi-old.h>
  35
  36 #define lttng_is_signed_type(type)      (((type)(-1)) < 0)
  37
  38 struct lttng_channel;
  39 struct lttng_session;
  40 struct lttng_metadata_cache;
  41 struct lib_ring_buffer_ctx;
  42 struct perf_event;
  43 struct perf_event_attr;
  44 struct lib_ring_buffer_config;
  45
  46 /* Type description */
  47
  48 enum abstract_types {
  49         atype_integer,
  50         atype_enum,
  51         atype_array,
  52         atype_sequence,
  53         atype_string,
  54         atype_struct,
  55         atype_array_compound,           /* Array of compound types. */
  56         atype_sequence_compound,        /* Sequence of compound types. */
  57         atype_variant,
  58         atype_array_bitfield,
  59         atype_sequence_bitfield,
  60         NR_ABSTRACT_TYPES,
  61 };
  62
  63 enum lttng_string_encodings {
  64         lttng_encode_none = 0,
  65         lttng_encode_UTF8 = 1,
  66         lttng_encode_ASCII = 2,
  67         NR_STRING_ENCODINGS,
  68 };
  69
  70 enum channel_type {
  71         PER_CPU_CHANNEL,
  72         METADATA_CHANNEL,
  73 };
  74
  75 struct lttng_enum_value {
  76         unsigned long long value;
  77         unsigned int signedness:1;
  78 };
  79
  80 struct lttng_enum_entry {
  81         struct lttng_enum_value start, end;     /* start and end are inclusive */
  82         const char *string;
  83         struct {
  84                 unsigned int is_auto:1;
  85         } options;
  86 };
  87
  88 #define __type_integer(_type, _size, _alignment, _signedness,   \
  89                 _byte_order, _base, _encoding)  \
  90         {                                                       \
  91             .atype = atype_integer,                             \
  92             .u.basic.integer =                                  \
  93                 {                                               \
  94                   .size = (_size) ? : sizeof(_type) * CHAR_BIT, \
  95                   .alignment = (_alignment) ? : lttng_alignof(_type) * CHAR_BIT, \
  96                   .signedness = (_signedness) >= 0 ? (_signedness) : lttng_is_signed_type(_type), \
  97                   .reverse_byte_order = _byte_order != __BYTE_ORDER, \
  98                   .base = _base,                                \
  99                   .encoding = lttng_encode_##_encoding,         \
 100                 },                                              \
 101         }                                                       \
 102
 103 struct lttng_integer_type {
 104         unsigned int size;              /* in bits */
 105         unsigned short alignment;       /* in bits */
 106         unsigned int signedness:1,
 107                 reverse_byte_order:1;
 108         unsigned int base;              /* 2, 8, 10, 16, for pretty print */
 109         enum lttng_string_encodings encoding;
 110 };
 111
 112 union _lttng_basic_type {
 113         struct lttng_integer_type integer;
 114         struct {
 115                 const struct lttng_enum_desc *desc;     /* Enumeration mapping */
 116                 struct lttng_integer_type container_type;
 117         } enumeration;
 118         struct {
 119                 enum lttng_string_encodings encoding;
 120         } string;
 121 };
 122
 123 struct lttng_basic_type {
 124         enum abstract_types atype;
 125         union {
 126                 union _lttng_basic_type basic;
 127         } u;
 128 };
 129
 130 struct lttng_type {
 131         enum abstract_types atype;
 132         union {
 133                 union _lttng_basic_type basic;
 134                 struct {
 135                         struct lttng_basic_type elem_type;
 136                         unsigned int length;            /* num. elems. */
 137                         unsigned int elem_alignment;    /* alignment override */
 138                 } array;
 139                 struct {
 140                         struct lttng_basic_type length_type;
 141                         struct lttng_basic_type elem_type;
 142                         unsigned int elem_alignment;    /* alignment override */
 143                 } sequence;
 144                 struct {
 145                         uint32_t nr_fields;
 146                         struct lttng_event_field *fields; /* Array of fields. */
 147                 } _struct;
 148                 struct {
 149                         struct lttng_type *elem_type;
 150                         unsigned int length;            /* num. elems. */
 151                 } array_compound;
 152                 struct {
 153                         struct lttng_type *elem_type;
 154                         const char *length_name;
 155                 } sequence_compound;
 156                 struct {
 157                         const char *tag_name;
 158                         struct lttng_event_field *choices; /* Array of fields. */
 159                         uint32_t nr_choices;
 160                 } variant;
 161         } u;
 162 };
 163
 164 struct lttng_enum_desc {
 165         const char *name;
 166         const struct lttng_enum_entry *entries;
 167         unsigned int nr_entries;
 168 };
 169
 170 /* Event field description */
 171
 172 struct lttng_event_field {
 173         const char *name;
 174         struct lttng_type type;
 175         unsigned int nowrite:1,         /* do not write into trace */
 176                         user:1;         /* fetch from user-space */
 177 };
 178
 179 union lttng_ctx_value {
 180         int64_t s64;
 181         const char *str;
 182         double d;
 183 };
 184
 185 /*
 186  * We need to keep this perf counter field separately from struct
 187  * lttng_ctx_field because cpu hotplug needs fixed-location addresses.
 188  */
 189 struct lttng_perf_counter_field {
 190 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))
 191         struct lttng_cpuhp_node cpuhp_prepare;
 192         struct lttng_cpuhp_node cpuhp_online;
 193 #else
 194         struct notifier_block nb;
 195         int hp_enable;
 196 #endif
 197         struct perf_event_attr *attr;
 198         struct perf_event **e;  /* per-cpu array */
 199 };
 200
 201 struct lttng_probe_ctx {
 202         struct lttng_event *event;
 203         uint8_t interruptible;
 204 };
 205
 206 struct lttng_ctx_field {
 207         struct lttng_event_field event_field;
 208         size_t (*get_size)(size_t offset);
 209         void (*record)(struct lttng_ctx_field *field,
 210                        struct lib_ring_buffer_ctx *ctx,
 211                        struct lttng_channel *chan);
 212         void (*get_value)(struct lttng_ctx_field *field,
 213                          struct lttng_probe_ctx *lttng_probe_ctx,
 214                          union lttng_ctx_value *value);
 215         union {
 216                 struct lttng_perf_counter_field *perf_counter;
 217         } u;
 218         void (*destroy)(struct lttng_ctx_field *field);
 219 };
 220
 221 struct lttng_ctx {
 222         struct lttng_ctx_field *fields;
 223         unsigned int nr_fields;
 224         unsigned int allocated_fields;
 225         size_t largest_align;   /* in bytes */
 226 };
 227
 228 struct lttng_event_desc {
 229         const char *name;               /* lttng-modules name */
 230         const char *kname;              /* Linux kernel name (tracepoints) */
 231         void *probe_callback;
 232         const struct lttng_event_ctx *ctx;      /* context */
 233         const struct lttng_event_field *fields; /* event payload */
 234         unsigned int nr_fields;
 235         struct module *owner;
 236 };
 237
 238 struct lttng_probe_desc {
 239         const char *provider;
 240         const struct lttng_event_desc **event_desc;
 241         unsigned int nr_events;
 242         struct list_head head;                  /* chain registered probes */
 243         struct list_head lazy_init_head;
 244         int lazy;                               /* lazy registration */
 245 };
 246
 247 struct lttng_krp;                               /* Kretprobe handling */
 248
 249 enum lttng_event_type {
 250         LTTNG_TYPE_EVENT = 0,
 251         LTTNG_TYPE_ENABLER = 1,
 252 };
 253
 254 struct lttng_filter_bytecode_node {
 255         struct list_head node;
 256         struct lttng_enabler *enabler;
 257         /*
 258          * struct lttng_kernel_filter_bytecode has var. sized array, must be
 259          * last field.
 260          */
 261         struct lttng_kernel_filter_bytecode bc;
 262 };
 263
 264 /*
 265  * Filter return value masks.
 266  */
 267 enum lttng_filter_ret {
 268         LTTNG_FILTER_DISCARD = 0,
 269         LTTNG_FILTER_RECORD_FLAG = (1ULL << 0),
 270         /* Other bits are kept for future use. */
 271 };
 272
 273 struct lttng_bytecode_runtime {
 274         /* Associated bytecode */
 275         struct lttng_filter_bytecode_node *bc;
 276         uint64_t (*filter)(void *filter_data, struct lttng_probe_ctx *lttng_probe_ctx,
 277                         const char *filter_stack_data);
 278         int link_failed;
 279         struct list_head node;  /* list of bytecode runtime in event */
 280         struct lttng_event *event;
 281 };
 282
 283 /*
 284  * Objects in a linked-list of enablers, owned by an event.
 285  */
 286 struct lttng_enabler_ref {
 287         struct list_head node;                  /* enabler ref list */
 288         struct lttng_enabler *ref;              /* backward ref */
 289 };
 290
 291 /*
 292  * lttng_event structure is referred to by the tracing fast path. It must be
 293  * kept small.
 294  */
 295 struct lttng_event {
 296         enum lttng_event_type evtype;   /* First field. */
 297         unsigned int id;
 298         struct lttng_channel *chan;
 299         int enabled;
 300         const struct lttng_event_desc *desc;
 301         void *filter;
 302         struct lttng_ctx *ctx;
 303         enum lttng_kernel_instrumentation instrumentation;
 304         union {
 305                 struct {
 306                         struct kprobe kp;
 307                         char *symbol_name;
 308                 } kprobe;
 309                 struct {
 310                         struct lttng_krp *lttng_krp;
 311                         char *symbol_name;
 312                 } kretprobe;
 313                 struct {
 314                         char *symbol_name;
 315                 } ftrace;
 316         } u;
 317         struct list_head list;          /* Event list in session */
 318         unsigned int metadata_dumped:1;
 319
 320         /* Backward references: list of lttng_enabler_ref (ref to enablers) */
 321         struct list_head enablers_ref_head;
 322         struct hlist_node hlist;        /* session ht of events */
 323         int registered;                 /* has reg'd tracepoint probe */
 324         /* list of struct lttng_bytecode_runtime, sorted by seqnum */
 325         struct list_head bytecode_runtime_head;
 326         int has_enablers_without_bytecode;
 327 };
 328
 329 enum lttng_enabler_type {
 330         LTTNG_ENABLER_STAR_GLOB,
 331         LTTNG_ENABLER_NAME,
 332 };
 333
 334 /*
 335  * Enabler field, within whatever object is enabling an event. Target of
 336  * backward reference.
 337  */
 338 struct lttng_enabler {
 339         enum lttng_event_type evtype;   /* First field. */
 340
 341         enum lttng_enabler_type type;
 342
 343         struct list_head node;  /* per-session list of enablers */
 344         /* head list of struct lttng_ust_filter_bytecode_node */
 345         struct list_head filter_bytecode_head;
 346
 347         struct lttng_kernel_event event_param;
 348         struct lttng_channel *chan;
 349         struct lttng_ctx *ctx;
 350         unsigned int enabled:1;
 351 };
 352
 353 struct lttng_channel_ops {
 354         struct channel *(*channel_create)(const char *name,
 355                                 struct lttng_channel *lttng_chan,
 356                                 void *buf_addr,
 357                                 size_t subbuf_size, size_t num_subbuf,
 358                                 unsigned int switch_timer_interval,
 359                                 unsigned int read_timer_interval);
 360         void (*channel_destroy)(struct channel *chan);
 361         struct lib_ring_buffer *(*buffer_read_open)(struct channel *chan);
 362         int (*buffer_has_read_closed_stream)(struct channel *chan);
 363         void (*buffer_read_close)(struct lib_ring_buffer *buf);
 364         int (*event_reserve)(struct lib_ring_buffer_ctx *ctx,
 365                              uint32_t event_id);
 366         void (*event_commit)(struct lib_ring_buffer_ctx *ctx);
 367         void (*event_write)(struct lib_ring_buffer_ctx *ctx, const void *src,
 368                             size_t len);
 369         void (*event_write_from_user)(struct lib_ring_buffer_ctx *ctx,
 370                                       const void *src, size_t len);
 371         void (*event_memset)(struct lib_ring_buffer_ctx *ctx,
 372                              int c, size_t len);
 373         void (*event_strcpy)(struct lib_ring_buffer_ctx *ctx, const char *src,
 374                              size_t len);
 375         void (*event_strcpy_from_user)(struct lib_ring_buffer_ctx *ctx,
 376                                        const char __user *src, size_t len);
 377         /*
 378          * packet_avail_size returns the available size in the current
 379          * packet. Note that the size returned is only a hint, since it
 380          * may change due to concurrent writes.
 381          */
 382         size_t (*packet_avail_size)(struct channel *chan);
 383         wait_queue_head_t *(*get_writer_buf_wait_queue)(struct channel *chan, int cpu);
 384         wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
 385         int (*is_finalized)(struct channel *chan);
 386         int (*is_disabled)(struct channel *chan);
 387         int (*timestamp_begin) (const struct lib_ring_buffer_config *config,
 388                         struct lib_ring_buffer *bufb,
 389                         uint64_t *timestamp_begin);
 390         int (*timestamp_end) (const struct lib_ring_buffer_config *config,
 391                         struct lib_ring_buffer *bufb,
 392                         uint64_t *timestamp_end);
 393         int (*events_discarded) (const struct lib_ring_buffer_config *config,
 394                         struct lib_ring_buffer *bufb,
 395                         uint64_t *events_discarded);
 396         int (*content_size) (const struct lib_ring_buffer_config *config,
 397                         struct lib_ring_buffer *bufb,
 398                         uint64_t *content_size);
 399         int (*packet_size) (const struct lib_ring_buffer_config *config,
 400                         struct lib_ring_buffer *bufb,
 401                         uint64_t *packet_size);
 402         int (*stream_id) (const struct lib_ring_buffer_config *config,
 403                         struct lib_ring_buffer *bufb,
 404                         uint64_t *stream_id);
 405         int (*current_timestamp) (const struct lib_ring_buffer_config *config,
 406                         struct lib_ring_buffer *bufb,
 407                         uint64_t *ts);
 408         int (*sequence_number) (const struct lib_ring_buffer_config *config,
 409                         struct lib_ring_buffer *bufb,
 410                         uint64_t *seq);
 411         int (*instance_id) (const struct lib_ring_buffer_config *config,
 412                         struct lib_ring_buffer *bufb,
 413                         uint64_t *id);
 414 };
 415
 416 struct lttng_transport {
 417         char *name;
 418         struct module *owner;
 419         struct list_head node;
 420         struct lttng_channel_ops ops;
 421 };
 422
 423 struct lttng_syscall_filter;
 424
 425 #define LTTNG_EVENT_HT_BITS             12
 426 #define LTTNG_EVENT_HT_SIZE             (1U << LTTNG_EVENT_HT_BITS)
 427
 428 struct lttng_event_ht {
 429         struct hlist_head table[LTTNG_EVENT_HT_SIZE];
 430 };
 431
 432 struct lttng_channel {
 433         unsigned int id;
 434         struct channel *chan;           /* Channel buffers */
 435         int enabled;
 436         struct lttng_ctx *ctx;
 437         /* Event ID management */
 438         struct lttng_session *session;
 439         struct file *file;              /* File associated to channel */
 440         unsigned int free_event_id;     /* Next event ID to allocate */
 441         struct list_head list;          /* Channel list */
 442         struct lttng_channel_ops *ops;
 443         struct lttng_transport *transport;
 444         struct lttng_event **sc_table;  /* for syscall tracing */
 445         struct lttng_event **compat_sc_table;
 446         struct lttng_event **sc_exit_table;     /* for syscall exit tracing */
 447         struct lttng_event **compat_sc_exit_table;
 448         struct lttng_event *sc_unknown; /* for unknown syscalls */
 449         struct lttng_event *sc_compat_unknown;
 450         struct lttng_event *sc_exit_unknown;
 451         struct lttng_event *compat_sc_exit_unknown;
 452         struct lttng_syscall_filter *sc_filter;
 453         int header_type;                /* 0: unset, 1: compact, 2: large */
 454         enum channel_type channel_type;
 455         unsigned int metadata_dumped:1,
 456                 sys_enter_registered:1,
 457                 sys_exit_registered:1,
 458                 syscall_all:1,
 459                 tstate:1;               /* Transient enable state */
 460 };
 461
 462 struct lttng_metadata_stream {
 463         void *priv;                     /* Ring buffer private data */
 464         struct lttng_metadata_cache *metadata_cache;
 465         unsigned int metadata_in;       /* Bytes read from the cache */
 466         unsigned int metadata_out;      /* Bytes consumed from stream */
 467         int finalized;                  /* Has channel been finalized */
 468         wait_queue_head_t read_wait;    /* Reader buffer-level wait queue */
 469         struct list_head list;          /* Stream list */
 470         struct lttng_transport *transport;
 471         uint64_t version;               /* Current version of the metadata cache */
 472 };
 473
 474 #define LTTNG_DYNAMIC_LEN_STACK_SIZE    128
 475
 476 struct lttng_dynamic_len_stack {
 477         size_t stack[LTTNG_DYNAMIC_LEN_STACK_SIZE];
 478         size_t offset;
 479 };
 480
 481 DECLARE_PER_CPU(struct lttng_dynamic_len_stack, lttng_dynamic_len_stack);
 482
 483 /*
 484  * struct lttng_pid_tracker declared in header due to deferencing of *v
 485  * in RCU_INITIALIZER(v).
 486  */
 487 #define LTTNG_PID_HASH_BITS     6
 488 #define LTTNG_PID_TABLE_SIZE    (1 << LTTNG_PID_HASH_BITS)
 489
 490 struct lttng_pid_tracker {
 491         struct hlist_head pid_hash[LTTNG_PID_TABLE_SIZE];
 492 };
 493
 494 struct lttng_pid_hash_node {
 495         struct hlist_node hlist;
 496         int pid;
 497 };
 498
 499 struct lttng_session {
 500         int active;                     /* Is trace session active ? */
 501         int been_active;                /* Has trace session been active ? */
 502         struct file *file;              /* File associated to session */
 503         struct list_head chan;          /* Channel list head */
 504         struct list_head events;        /* Event list head */
 505         struct list_head list;          /* Session list */
 506         unsigned int free_chan_id;      /* Next chan ID to allocate */
 507         uuid_le uuid;                   /* Trace session unique ID */
 508         struct lttng_metadata_cache *metadata_cache;
 509         struct lttng_pid_tracker *pid_tracker;
 510         unsigned int metadata_dumped:1,
 511                 tstate:1;               /* Transient enable state */
 512         /* List of enablers */
 513         struct list_head enablers_head;
 514         /* Hash table of events */
 515         struct lttng_event_ht events_ht;
 516 };
 517
 518 struct lttng_metadata_cache {
 519         char *data;                     /* Metadata cache */
 520         unsigned int cache_alloc;       /* Metadata allocated size (bytes) */
 521         unsigned int metadata_written;  /* Number of bytes written in metadata cache */
 522         struct kref refcount;           /* Metadata cache usage */
 523         struct list_head metadata_stream;       /* Metadata stream list */
 524         uuid_le uuid;                   /* Trace session unique ID (copy) */
 525         struct mutex lock;              /* Produce/consume lock */
 526         uint64_t version;               /* Current version of the metadata */
 527 };
 528
 529 void lttng_lock_sessions(void);
 530 void lttng_unlock_sessions(void);
 531
 532 struct list_head *lttng_get_probe_list_head(void);
 533
 534 struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type,
 535                 struct lttng_kernel_event *event_param,
 536                 struct lttng_channel *chan);
 537
 538 int lttng_enabler_enable(struct lttng_enabler *enabler);
 539 int lttng_enabler_disable(struct lttng_enabler *enabler);
 540 int lttng_fix_pending_events(void);
 541 int lttng_session_active(void);
 542
 543 struct lttng_session *lttng_session_create(void);
 544 int lttng_session_enable(struct lttng_session *session);
 545 int lttng_session_disable(struct lttng_session *session);
 546 void lttng_session_destroy(struct lttng_session *session);
 547 int lttng_session_metadata_regenerate(struct lttng_session *session);
 548 int lttng_session_statedump(struct lttng_session *session);
 549 void metadata_cache_destroy(struct kref *kref);
 550
 551 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
 552                                        const char *transport_name,
 553                                        void *buf_addr,
 554                                        size_t subbuf_size, size_t num_subbuf,
 555                                        unsigned int switch_timer_interval,
 556                                        unsigned int read_timer_interval,
 557                                        enum channel_type channel_type);
 558 struct lttng_channel *lttng_global_channel_create(struct lttng_session *session,
 559                                        int overwrite, void *buf_addr,
 560                                        size_t subbuf_size, size_t num_subbuf,
 561                                        unsigned int switch_timer_interval,
 562                                        unsigned int read_timer_interval);
 563
 564 void lttng_metadata_channel_destroy(struct lttng_channel *chan);
 565 struct lttng_event *lttng_event_create(struct lttng_channel *chan,
 566                                 struct lttng_kernel_event *event_param,
 567                                 void *filter,
 568                                 const struct lttng_event_desc *event_desc,
 569                                 enum lttng_kernel_instrumentation itype);
 570 struct lttng_event *_lttng_event_create(struct lttng_channel *chan,
 571                                 struct lttng_kernel_event *event_param,
 572                                 void *filter,
 573                                 const struct lttng_event_desc *event_desc,
 574                                 enum lttng_kernel_instrumentation itype);
 575 struct lttng_event *lttng_event_compat_old_create(struct lttng_channel *chan,
 576                 struct lttng_kernel_old_event *old_event_param,
 577                 void *filter,
 578                 const struct lttng_event_desc *internal_desc);
 579
 580 int lttng_channel_enable(struct lttng_channel *channel);
 581 int lttng_channel_disable(struct lttng_channel *channel);
 582 int lttng_event_enable(struct lttng_event *event);
 583 int lttng_event_disable(struct lttng_event *event);
 584
 585 void lttng_transport_register(struct lttng_transport *transport);
 586 void lttng_transport_unregister(struct lttng_transport *transport);
 587
 588 void synchronize_trace(void);
 589 int lttng_abi_init(void);
 590 int lttng_abi_compat_old_init(void);
 591 void lttng_abi_exit(void);
 592 void lttng_abi_compat_old_exit(void);
 593
 594 int lttng_probe_register(struct lttng_probe_desc *desc);
 595 void lttng_probe_unregister(struct lttng_probe_desc *desc);
 596 const struct lttng_event_desc *lttng_event_get(const char *name);
 597 void lttng_event_put(const struct lttng_event_desc *desc);
 598 int lttng_probes_init(void);
 599 void lttng_probes_exit(void);
 600
 601 int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
 602                 struct channel *chan);
 603
 604 int lttng_pid_tracker_get_node_pid(const struct lttng_pid_hash_node *node);
 605 struct lttng_pid_tracker *lttng_pid_tracker_create(void);
 606 void lttng_pid_tracker_destroy(struct lttng_pid_tracker *lpf);
 607 bool lttng_pid_tracker_lookup(struct lttng_pid_tracker *lpf, int pid);
 608 int lttng_pid_tracker_add(struct lttng_pid_tracker *lpf, int pid);
 609 int lttng_pid_tracker_del(struct lttng_pid_tracker *lpf, int pid);
 610
 611 int lttng_session_track_pid(struct lttng_session *session, int pid);
 612 int lttng_session_untrack_pid(struct lttng_session *session, int pid);
 613
 614 int lttng_session_list_tracker_pids(struct lttng_session *session);
 615
 616 void lttng_clock_ref(void);
 617 void lttng_clock_unref(void);
 618
 619 #if defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
 620 int lttng_syscalls_register(struct lttng_channel *chan, void *filter);
 621 int lttng_syscalls_unregister(struct lttng_channel *chan);
 622 int lttng_syscall_filter_enable(struct lttng_channel *chan,
 623                 const char *name);
 624 int lttng_syscall_filter_disable(struct lttng_channel *chan,
 625                 const char *name);
 626 long lttng_channel_syscall_mask(struct lttng_channel *channel,
 627                 struct lttng_kernel_syscall_mask __user *usyscall_mask);
 628 #else
 629 static inline int lttng_syscalls_register(struct lttng_channel *chan, void *filter)
 630 {
 631         return -ENOSYS;
 632 }
 633
 634 static inline int lttng_syscalls_unregister(struct lttng_channel *chan)
 635 {
 636         return 0;
 637 }
 638
 639 static inline int lttng_syscall_filter_enable(struct lttng_channel *chan,
 640                 const char *name)
 641 {
 642         return -ENOSYS;
 643 }
 644
 645 static inline int lttng_syscall_filter_disable(struct lttng_channel *chan,
 646                 const char *name)
 647 {
 648         return -ENOSYS;
 649 }
 650
 651 static inline long lttng_channel_syscall_mask(struct lttng_channel *channel,
 652                 struct lttng_kernel_syscall_mask __user *usyscall_mask)
 653 {
 654         return -ENOSYS;
 655 }
 656 #endif
 657
 658 void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime);
 659 int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler,
 660                 struct lttng_kernel_filter_bytecode __user *bytecode);
 661 void lttng_enabler_event_link_bytecode(struct lttng_event *event,
 662                 struct lttng_enabler *enabler);
 663
 664 int lttng_probes_init(void);
 665
 666 extern struct lttng_ctx *lttng_static_ctx;
 667
 668 int lttng_context_init(void);
 669 void lttng_context_exit(void);
 670 struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx);
 671 void lttng_context_update(struct lttng_ctx *ctx);
 672 int lttng_find_context(struct lttng_ctx *ctx, const char *name);
 673 int lttng_get_context_index(struct lttng_ctx *ctx, const char *name);
 674 void lttng_remove_context_field(struct lttng_ctx **ctx,
 675                                 struct lttng_ctx_field *field);
 676 void lttng_destroy_context(struct lttng_ctx *ctx);
 677 int lttng_add_pid_to_ctx(struct lttng_ctx **ctx);
 678 int lttng_add_cpu_id_to_ctx(struct lttng_ctx **ctx);
 679 int lttng_add_procname_to_ctx(struct lttng_ctx **ctx);
 680 int lttng_add_prio_to_ctx(struct lttng_ctx **ctx);
 681 int lttng_add_nice_to_ctx(struct lttng_ctx **ctx);
 682 int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
 683 int lttng_add_tid_to_ctx(struct lttng_ctx **ctx);
 684 int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
 685 int lttng_add_ppid_to_ctx(struct lttng_ctx **ctx);
 686 int lttng_add_vppid_to_ctx(struct lttng_ctx **ctx);
 687 int lttng_add_hostname_to_ctx(struct lttng_ctx **ctx);
 688 int lttng_add_interruptible_to_ctx(struct lttng_ctx **ctx);
 689 int lttng_add_need_reschedule_to_ctx(struct lttng_ctx **ctx);
 690 #if defined(CONFIG_PREEMPT_RT_FULL) || defined(CONFIG_PREEMPT)
 691 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx);
 692 #else
 693 static inline
 694 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx)
 695 {
 696         return -ENOSYS;
 697 }
 698 #endif
 699 #ifdef CONFIG_PREEMPT_RT_FULL
 700 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx);
 701 #else
 702 static inline
 703 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx)
 704 {
 705         return -ENOSYS;
 706 }
 707 #endif
 708 #if defined(CONFIG_PERF_EVENTS) && (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33))
 709 int lttng_add_perf_counter_to_ctx(uint32_t type,
 710                                   uint64_t config,
 711                                   const char *name,
 712                                   struct lttng_ctx **ctx);
 713 int lttng_cpuhp_perf_counter_online(unsigned int cpu,
 714                 struct lttng_cpuhp_node *node);
 715 int lttng_cpuhp_perf_counter_dead(unsigned int cpu,
 716                 struct lttng_cpuhp_node *node);
 717 #else
 718 static inline
 719 int lttng_add_perf_counter_to_ctx(uint32_t type,
 720                                   uint64_t config,
 721                                   const char *name,
 722                                   struct lttng_ctx **ctx)
 723 {
 724         return -ENOSYS;
 725 }
 726 static inline
 727 int lttng_cpuhp_perf_counter_online(unsigned int cpu,
 728                 struct lttng_cpuhp_node *node)
 729 {
 730         return 0;
 731 }
 732 static inline
 733 int lttng_cpuhp_perf_counter_dead(unsigned int cpu,
 734                 struct lttng_cpuhp_node *node)
 735 {
 736         return 0;
 737 }
 738 #endif
 739
 740 int lttng_logger_init(void);
 741 void lttng_logger_exit(void);
 742
 743 extern int lttng_statedump_start(struct lttng_session *session);
 744
 745 #ifdef CONFIG_KPROBES
 746 int lttng_kprobes_register(const char *name,
 747                 const char *symbol_name,
 748                 uint64_t offset,
 749                 uint64_t addr,
 750                 struct lttng_event *event);
 751 void lttng_kprobes_unregister(struct lttng_event *event);
 752 void lttng_kprobes_destroy_private(struct lttng_event *event);
 753 #else
 754 static inline
 755 int lttng_kprobes_register(const char *name,
 756                 const char *symbol_name,
 757                 uint64_t offset,
 758                 uint64_t addr,
 759                 struct lttng_event *event)
 760 {
 761         return -ENOSYS;
 762 }
 763
 764 static inline
 765 void lttng_kprobes_unregister(struct lttng_event *event)
 766 {
 767 }
 768
 769 static inline
 770 void lttng_kprobes_destroy_private(struct lttng_event *event)
 771 {
 772 }
 773 #endif
 774
 775 #ifdef CONFIG_KRETPROBES
 776 int lttng_kretprobes_register(const char *name,
 777                 const char *symbol_name,
 778                 uint64_t offset,
 779                 uint64_t addr,
 780                 struct lttng_event *event_entry,
 781                 struct lttng_event *event_exit);
 782 void lttng_kretprobes_unregister(struct lttng_event *event);
 783 void lttng_kretprobes_destroy_private(struct lttng_event *event);
 784 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
 785         int enable);
 786 #else
 787 static inline
 788 int lttng_kretprobes_register(const char *name,
 789                 const char *symbol_name,
 790                 uint64_t offset,
 791                 uint64_t addr,
 792                 struct lttng_event *event_entry,
 793                 struct lttng_event *event_exit)
 794 {
 795         return -ENOSYS;
 796 }
 797
 798 static inline
 799 void lttng_kretprobes_unregister(struct lttng_event *event)
 800 {
 801 }
 802
 803 static inline
 804 void lttng_kretprobes_destroy_private(struct lttng_event *event)
 805 {
 806 }
 807
 808 static inline
 809 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
 810         int enable)
 811 {
 812         return -ENOSYS;
 813 }
 814 #endif
 815
 816 #if defined(CONFIG_DYNAMIC_FTRACE) && !defined(LTTNG_FTRACE_MISSING_HEADER)
 817 int lttng_ftrace_register(const char *name,
 818                           const char *symbol_name,
 819                           struct lttng_event *event);
 820 void lttng_ftrace_unregister(struct lttng_event *event);
 821 void lttng_ftrace_destroy_private(struct lttng_event *event);
 822 #else
 823 static inline
 824 int lttng_ftrace_register(const char *name,
 825                           const char *symbol_name,
 826                           struct lttng_event *event)
 827 {
 828         return -ENOSYS;
 829 }
 830
 831 static inline
 832 void lttng_ftrace_unregister(struct lttng_event *event)
 833 {
 834 }
 835
 836 static inline
 837 void lttng_ftrace_destroy_private(struct lttng_event *event)
 838 {
 839 }
 840 #endif
 841
 842 int lttng_calibrate(struct lttng_kernel_calibrate *calibrate);
 843
 844 extern const struct file_operations lttng_tracepoint_list_fops;
 845 extern const struct file_operations lttng_syscall_list_fops;
 846
 847 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35))
 848 #define TRACEPOINT_HAS_DATA_ARG
 849 #endif
 850
 851 #endif /* _LTTNG_EVENTS_H */