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         size_t (*get_size_arg)(size_t offset, struct lttng_ctx_field *field,
 210                                struct lib_ring_buffer_ctx *ctx,
 211                                struct lttng_channel *chan);
 212         void (*record)(struct lttng_ctx_field *field,
 213                        struct lib_ring_buffer_ctx *ctx,
 214                        struct lttng_channel *chan);
 215         void (*get_value)(struct lttng_ctx_field *field,
 216                          struct lttng_probe_ctx *lttng_probe_ctx,
 217                          union lttng_ctx_value *value);
 218         union {
 219                 struct lttng_perf_counter_field *perf_counter;
 220         } u;
 221         void (*destroy)(struct lttng_ctx_field *field);
 222         /*
 223          * Private data to keep state between get_size and record.
 224          * User must perform its own synchronization to protect against
 225          * concurrent and reentrant contexts.
 226          */
 227         void *priv;
 228 };
 229
 230 struct lttng_ctx {
 231         struct lttng_ctx_field *fields;
 232         unsigned int nr_fields;
 233         unsigned int allocated_fields;
 234         size_t largest_align;   /* in bytes */
 235 };
 236
 237 struct lttng_event_desc {
 238         const char *name;               /* lttng-modules name */
 239         const char *kname;              /* Linux kernel name (tracepoints) */
 240         void *probe_callback;
 241         const struct lttng_event_ctx *ctx;      /* context */
 242         const struct lttng_event_field *fields; /* event payload */
 243         unsigned int nr_fields;
 244         struct module *owner;
 245 };
 246
 247 struct lttng_probe_desc {
 248         const char *provider;
 249         const struct lttng_event_desc **event_desc;
 250         unsigned int nr_events;
 251         struct list_head head;                  /* chain registered probes */
 252         struct list_head lazy_init_head;
 253         int lazy;                               /* lazy registration */
 254 };
 255
 256 struct lttng_krp;                               /* Kretprobe handling */
 257
 258 enum lttng_event_type {
 259         LTTNG_TYPE_EVENT = 0,
 260         LTTNG_TYPE_ENABLER = 1,
 261 };
 262
 263 struct lttng_filter_bytecode_node {
 264         struct list_head node;
 265         struct lttng_enabler *enabler;
 266         /*
 267          * struct lttng_kernel_filter_bytecode has var. sized array, must be
 268          * last field.
 269          */
 270         struct lttng_kernel_filter_bytecode bc;
 271 };
 272
 273 /*
 274  * Filter return value masks.
 275  */
 276 enum lttng_filter_ret {
 277         LTTNG_FILTER_DISCARD = 0,
 278         LTTNG_FILTER_RECORD_FLAG = (1ULL << 0),
 279         /* Other bits are kept for future use. */
 280 };
 281
 282 struct lttng_bytecode_runtime {
 283         /* Associated bytecode */
 284         struct lttng_filter_bytecode_node *bc;
 285         uint64_t (*filter)(void *filter_data, struct lttng_probe_ctx *lttng_probe_ctx,
 286                         const char *filter_stack_data);
 287         int link_failed;
 288         struct list_head node;  /* list of bytecode runtime in event */
 289         struct lttng_event *event;
 290 };
 291
 292 /*
 293  * Objects in a linked-list of enablers, owned by an event.
 294  */
 295 struct lttng_enabler_ref {
 296         struct list_head node;                  /* enabler ref list */
 297         struct lttng_enabler *ref;              /* backward ref */
 298 };
 299
 300 /*
 301  * lttng_event structure is referred to by the tracing fast path. It must be
 302  * kept small.
 303  */
 304 struct lttng_event {
 305         enum lttng_event_type evtype;   /* First field. */
 306         unsigned int id;
 307         struct lttng_channel *chan;
 308         int enabled;
 309         const struct lttng_event_desc *desc;
 310         void *filter;
 311         struct lttng_ctx *ctx;
 312         enum lttng_kernel_instrumentation instrumentation;
 313         union {
 314                 struct {
 315                         struct kprobe kp;
 316                         char *symbol_name;
 317                 } kprobe;
 318                 struct {
 319                         struct lttng_krp *lttng_krp;
 320                         char *symbol_name;
 321                 } kretprobe;
 322                 struct {
 323                         char *symbol_name;
 324                 } ftrace;
 325         } u;
 326         struct list_head list;          /* Event list in session */
 327         unsigned int metadata_dumped:1;
 328
 329         /* Backward references: list of lttng_enabler_ref (ref to enablers) */
 330         struct list_head enablers_ref_head;
 331         struct hlist_node hlist;        /* session ht of events */
 332         int registered;                 /* has reg'd tracepoint probe */
 333         /* list of struct lttng_bytecode_runtime, sorted by seqnum */
 334         struct list_head bytecode_runtime_head;
 335         int has_enablers_without_bytecode;
 336 };
 337
 338 enum lttng_enabler_type {
 339         LTTNG_ENABLER_STAR_GLOB,
 340         LTTNG_ENABLER_NAME,
 341 };
 342
 343 /*
 344  * Enabler field, within whatever object is enabling an event. Target of
 345  * backward reference.
 346  */
 347 struct lttng_enabler {
 348         enum lttng_event_type evtype;   /* First field. */
 349
 350         enum lttng_enabler_type type;
 351
 352         struct list_head node;  /* per-session list of enablers */
 353         /* head list of struct lttng_ust_filter_bytecode_node */
 354         struct list_head filter_bytecode_head;
 355
 356         struct lttng_kernel_event event_param;
 357         struct lttng_channel *chan;
 358         struct lttng_ctx *ctx;
 359         unsigned int enabled:1;
 360 };
 361
 362 struct lttng_channel_ops {
 363         struct channel *(*channel_create)(const char *name,
 364                                 struct lttng_channel *lttng_chan,
 365                                 void *buf_addr,
 366                                 size_t subbuf_size, size_t num_subbuf,
 367                                 unsigned int switch_timer_interval,
 368                                 unsigned int read_timer_interval);
 369         void (*channel_destroy)(struct channel *chan);
 370         struct lib_ring_buffer *(*buffer_read_open)(struct channel *chan);
 371         int (*buffer_has_read_closed_stream)(struct channel *chan);
 372         void (*buffer_read_close)(struct lib_ring_buffer *buf);
 373         int (*event_reserve)(struct lib_ring_buffer_ctx *ctx,
 374                              uint32_t event_id);
 375         void (*event_commit)(struct lib_ring_buffer_ctx *ctx);
 376         void (*event_write)(struct lib_ring_buffer_ctx *ctx, const void *src,
 377                             size_t len);
 378         void (*event_write_from_user)(struct lib_ring_buffer_ctx *ctx,
 379                                       const void *src, size_t len);
 380         void (*event_memset)(struct lib_ring_buffer_ctx *ctx,
 381                              int c, size_t len);
 382         void (*event_strcpy)(struct lib_ring_buffer_ctx *ctx, const char *src,
 383                              size_t len);
 384         void (*event_strcpy_from_user)(struct lib_ring_buffer_ctx *ctx,
 385                                        const char __user *src, size_t len);
 386         /*
 387          * packet_avail_size returns the available size in the current
 388          * packet. Note that the size returned is only a hint, since it
 389          * may change due to concurrent writes.
 390          */
 391         size_t (*packet_avail_size)(struct channel *chan);
 392         wait_queue_head_t *(*get_writer_buf_wait_queue)(struct channel *chan, int cpu);
 393         wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
 394         int (*is_finalized)(struct channel *chan);
 395         int (*is_disabled)(struct channel *chan);
 396         int (*timestamp_begin) (const struct lib_ring_buffer_config *config,
 397                         struct lib_ring_buffer *bufb,
 398                         uint64_t *timestamp_begin);
 399         int (*timestamp_end) (const struct lib_ring_buffer_config *config,
 400                         struct lib_ring_buffer *bufb,
 401                         uint64_t *timestamp_end);
 402         int (*events_discarded) (const struct lib_ring_buffer_config *config,
 403                         struct lib_ring_buffer *bufb,
 404                         uint64_t *events_discarded);
 405         int (*content_size) (const struct lib_ring_buffer_config *config,
 406                         struct lib_ring_buffer *bufb,
 407                         uint64_t *content_size);
 408         int (*packet_size) (const struct lib_ring_buffer_config *config,
 409                         struct lib_ring_buffer *bufb,
 410                         uint64_t *packet_size);
 411         int (*stream_id) (const struct lib_ring_buffer_config *config,
 412                         struct lib_ring_buffer *bufb,
 413                         uint64_t *stream_id);
 414         int (*current_timestamp) (const struct lib_ring_buffer_config *config,
 415                         struct lib_ring_buffer *bufb,
 416                         uint64_t *ts);
 417         int (*sequence_number) (const struct lib_ring_buffer_config *config,
 418                         struct lib_ring_buffer *bufb,
 419                         uint64_t *seq);
 420         int (*instance_id) (const struct lib_ring_buffer_config *config,
 421                         struct lib_ring_buffer *bufb,
 422                         uint64_t *id);
 423 };
 424
 425 struct lttng_transport {
 426         char *name;
 427         struct module *owner;
 428         struct list_head node;
 429         struct lttng_channel_ops ops;
 430 };
 431
 432 struct lttng_syscall_filter;
 433
 434 #define LTTNG_EVENT_HT_BITS             12
 435 #define LTTNG_EVENT_HT_SIZE             (1U << LTTNG_EVENT_HT_BITS)
 436
 437 struct lttng_event_ht {
 438         struct hlist_head table[LTTNG_EVENT_HT_SIZE];
 439 };
 440
 441 struct lttng_channel {
 442         unsigned int id;
 443         struct channel *chan;           /* Channel buffers */
 444         int enabled;
 445         struct lttng_ctx *ctx;
 446         /* Event ID management */
 447         struct lttng_session *session;
 448         struct file *file;              /* File associated to channel */
 449         unsigned int free_event_id;     /* Next event ID to allocate */
 450         struct list_head list;          /* Channel list */
 451         struct lttng_channel_ops *ops;
 452         struct lttng_transport *transport;
 453         struct lttng_event **sc_table;  /* for syscall tracing */
 454         struct lttng_event **compat_sc_table;
 455         struct lttng_event **sc_exit_table;     /* for syscall exit tracing */
 456         struct lttng_event **compat_sc_exit_table;
 457         struct lttng_event *sc_unknown; /* for unknown syscalls */
 458         struct lttng_event *sc_compat_unknown;
 459         struct lttng_event *sc_exit_unknown;
 460         struct lttng_event *compat_sc_exit_unknown;
 461         struct lttng_syscall_filter *sc_filter;
 462         int header_type;                /* 0: unset, 1: compact, 2: large */
 463         enum channel_type channel_type;
 464         unsigned int metadata_dumped:1,
 465                 sys_enter_registered:1,
 466                 sys_exit_registered:1,
 467                 syscall_all:1,
 468                 tstate:1;               /* Transient enable state */
 469 };
 470
 471 struct lttng_metadata_stream {
 472         void *priv;                     /* Ring buffer private data */
 473         struct lttng_metadata_cache *metadata_cache;
 474         unsigned int metadata_in;       /* Bytes read from the cache */
 475         unsigned int metadata_out;      /* Bytes consumed from stream */
 476         int finalized;                  /* Has channel been finalized */
 477         wait_queue_head_t read_wait;    /* Reader buffer-level wait queue */
 478         struct list_head list;          /* Stream list */
 479         struct lttng_transport *transport;
 480         uint64_t version;               /* Current version of the metadata cache */
 481 };
 482
 483 #define LTTNG_DYNAMIC_LEN_STACK_SIZE    128
 484
 485 struct lttng_dynamic_len_stack {
 486         size_t stack[LTTNG_DYNAMIC_LEN_STACK_SIZE];
 487         size_t offset;
 488 };
 489
 490 DECLARE_PER_CPU(struct lttng_dynamic_len_stack, lttng_dynamic_len_stack);
 491
 492 /*
 493  * struct lttng_pid_tracker declared in header due to deferencing of *v
 494  * in RCU_INITIALIZER(v).
 495  */
 496 #define LTTNG_PID_HASH_BITS     6
 497 #define LTTNG_PID_TABLE_SIZE    (1 << LTTNG_PID_HASH_BITS)
 498
 499 struct lttng_pid_tracker {
 500         struct hlist_head pid_hash[LTTNG_PID_TABLE_SIZE];
 501 };
 502
 503 struct lttng_pid_hash_node {
 504         struct hlist_node hlist;
 505         int pid;
 506 };
 507
 508 struct lttng_session {
 509         int active;                     /* Is trace session active ? */
 510         int been_active;                /* Has trace session been active ? */
 511         struct file *file;              /* File associated to session */
 512         struct list_head chan;          /* Channel list head */
 513         struct list_head events;        /* Event list head */
 514         struct list_head list;          /* Session list */
 515         unsigned int free_chan_id;      /* Next chan ID to allocate */
 516         uuid_le uuid;                   /* Trace session unique ID */
 517         struct lttng_metadata_cache *metadata_cache;
 518         struct lttng_pid_tracker *pid_tracker;
 519         unsigned int metadata_dumped:1,
 520                 tstate:1;               /* Transient enable state */
 521         /* List of enablers */
 522         struct list_head enablers_head;
 523         /* Hash table of events */
 524         struct lttng_event_ht events_ht;
 525 };
 526
 527 struct lttng_metadata_cache {
 528         char *data;                     /* Metadata cache */
 529         unsigned int cache_alloc;       /* Metadata allocated size (bytes) */
 530         unsigned int metadata_written;  /* Number of bytes written in metadata cache */
 531         struct kref refcount;           /* Metadata cache usage */
 532         struct list_head metadata_stream;       /* Metadata stream list */
 533         uuid_le uuid;                   /* Trace session unique ID (copy) */
 534         struct mutex lock;              /* Produce/consume lock */
 535         uint64_t version;               /* Current version of the metadata */
 536 };
 537
 538 void lttng_lock_sessions(void);
 539 void lttng_unlock_sessions(void);
 540
 541 struct list_head *lttng_get_probe_list_head(void);
 542
 543 struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type,
 544                 struct lttng_kernel_event *event_param,
 545                 struct lttng_channel *chan);
 546
 547 int lttng_enabler_enable(struct lttng_enabler *enabler);
 548 int lttng_enabler_disable(struct lttng_enabler *enabler);
 549 int lttng_fix_pending_events(void);
 550 int lttng_session_active(void);
 551
 552 struct lttng_session *lttng_session_create(void);
 553 int lttng_session_enable(struct lttng_session *session);
 554 int lttng_session_disable(struct lttng_session *session);
 555 void lttng_session_destroy(struct lttng_session *session);
 556 int lttng_session_metadata_regenerate(struct lttng_session *session);
 557 int lttng_session_statedump(struct lttng_session *session);
 558 void metadata_cache_destroy(struct kref *kref);
 559
 560 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
 561                                        const char *transport_name,
 562                                        void *buf_addr,
 563                                        size_t subbuf_size, size_t num_subbuf,
 564                                        unsigned int switch_timer_interval,
 565                                        unsigned int read_timer_interval,
 566                                        enum channel_type channel_type);
 567 struct lttng_channel *lttng_global_channel_create(struct lttng_session *session,
 568                                        int overwrite, void *buf_addr,
 569                                        size_t subbuf_size, size_t num_subbuf,
 570                                        unsigned int switch_timer_interval,
 571                                        unsigned int read_timer_interval);
 572
 573 void lttng_metadata_channel_destroy(struct lttng_channel *chan);
 574 struct lttng_event *lttng_event_create(struct lttng_channel *chan,
 575                                 struct lttng_kernel_event *event_param,
 576                                 void *filter,
 577                                 const struct lttng_event_desc *event_desc,
 578                                 enum lttng_kernel_instrumentation itype);
 579 struct lttng_event *_lttng_event_create(struct lttng_channel *chan,
 580                                 struct lttng_kernel_event *event_param,
 581                                 void *filter,
 582                                 const struct lttng_event_desc *event_desc,
 583                                 enum lttng_kernel_instrumentation itype);
 584 struct lttng_event *lttng_event_compat_old_create(struct lttng_channel *chan,
 585                 struct lttng_kernel_old_event *old_event_param,
 586                 void *filter,
 587                 const struct lttng_event_desc *internal_desc);
 588
 589 int lttng_channel_enable(struct lttng_channel *channel);
 590 int lttng_channel_disable(struct lttng_channel *channel);
 591 int lttng_event_enable(struct lttng_event *event);
 592 int lttng_event_disable(struct lttng_event *event);
 593
 594 void lttng_transport_register(struct lttng_transport *transport);
 595 void lttng_transport_unregister(struct lttng_transport *transport);
 596
 597 void synchronize_trace(void);
 598 int lttng_abi_init(void);
 599 int lttng_abi_compat_old_init(void);
 600 void lttng_abi_exit(void);
 601 void lttng_abi_compat_old_exit(void);
 602
 603 int lttng_probe_register(struct lttng_probe_desc *desc);
 604 void lttng_probe_unregister(struct lttng_probe_desc *desc);
 605 const struct lttng_event_desc *lttng_event_get(const char *name);
 606 void lttng_event_put(const struct lttng_event_desc *desc);
 607 int lttng_probes_init(void);
 608 void lttng_probes_exit(void);
 609
 610 int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
 611                 struct channel *chan);
 612
 613 int lttng_pid_tracker_get_node_pid(const struct lttng_pid_hash_node *node);
 614 struct lttng_pid_tracker *lttng_pid_tracker_create(void);
 615 void lttng_pid_tracker_destroy(struct lttng_pid_tracker *lpf);
 616 bool lttng_pid_tracker_lookup(struct lttng_pid_tracker *lpf, int pid);
 617 int lttng_pid_tracker_add(struct lttng_pid_tracker *lpf, int pid);
 618 int lttng_pid_tracker_del(struct lttng_pid_tracker *lpf, int pid);
 619
 620 int lttng_session_track_pid(struct lttng_session *session, int pid);
 621 int lttng_session_untrack_pid(struct lttng_session *session, int pid);
 622
 623 int lttng_session_list_tracker_pids(struct lttng_session *session);
 624
 625 void lttng_clock_ref(void);
 626 void lttng_clock_unref(void);
 627
 628 #if defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
 629 int lttng_syscalls_register(struct lttng_channel *chan, void *filter);
 630 int lttng_syscalls_unregister(struct lttng_channel *chan);
 631 int lttng_syscall_filter_enable(struct lttng_channel *chan,
 632                 const char *name);
 633 int lttng_syscall_filter_disable(struct lttng_channel *chan,
 634                 const char *name);
 635 long lttng_channel_syscall_mask(struct lttng_channel *channel,
 636                 struct lttng_kernel_syscall_mask __user *usyscall_mask);
 637 #else
 638 static inline int lttng_syscalls_register(struct lttng_channel *chan, void *filter)
 639 {
 640         return -ENOSYS;
 641 }
 642
 643 static inline int lttng_syscalls_unregister(struct lttng_channel *chan)
 644 {
 645         return 0;
 646 }
 647
 648 static inline int lttng_syscall_filter_enable(struct lttng_channel *chan,
 649                 const char *name)
 650 {
 651         return -ENOSYS;
 652 }
 653
 654 static inline int lttng_syscall_filter_disable(struct lttng_channel *chan,
 655                 const char *name)
 656 {
 657         return -ENOSYS;
 658 }
 659
 660 static inline long lttng_channel_syscall_mask(struct lttng_channel *channel,
 661                 struct lttng_kernel_syscall_mask __user *usyscall_mask)
 662 {
 663         return -ENOSYS;
 664 }
 665 #endif
 666
 667 void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime);
 668 int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler,
 669                 struct lttng_kernel_filter_bytecode __user *bytecode);
 670 void lttng_enabler_event_link_bytecode(struct lttng_event *event,
 671                 struct lttng_enabler *enabler);
 672
 673 int lttng_probes_init(void);
 674
 675 extern struct lttng_ctx *lttng_static_ctx;
 676
 677 int lttng_context_init(void);
 678 void lttng_context_exit(void);
 679 struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx);
 680 void lttng_context_update(struct lttng_ctx *ctx);
 681 int lttng_find_context(struct lttng_ctx *ctx, const char *name);
 682 int lttng_get_context_index(struct lttng_ctx *ctx, const char *name);
 683 void lttng_remove_context_field(struct lttng_ctx **ctx,
 684                                 struct lttng_ctx_field *field);
 685 void lttng_destroy_context(struct lttng_ctx *ctx);
 686 int lttng_add_pid_to_ctx(struct lttng_ctx **ctx);
 687 int lttng_add_cpu_id_to_ctx(struct lttng_ctx **ctx);
 688 int lttng_add_procname_to_ctx(struct lttng_ctx **ctx);
 689 int lttng_add_prio_to_ctx(struct lttng_ctx **ctx);
 690 int lttng_add_nice_to_ctx(struct lttng_ctx **ctx);
 691 int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
 692 int lttng_add_tid_to_ctx(struct lttng_ctx **ctx);
 693 int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
 694 int lttng_add_ppid_to_ctx(struct lttng_ctx **ctx);
 695 int lttng_add_vppid_to_ctx(struct lttng_ctx **ctx);
 696 int lttng_add_hostname_to_ctx(struct lttng_ctx **ctx);
 697 int lttng_add_interruptible_to_ctx(struct lttng_ctx **ctx);
 698 int lttng_add_need_reschedule_to_ctx(struct lttng_ctx **ctx);
 699 #if defined(CONFIG_PREEMPT_RT_FULL) || defined(CONFIG_PREEMPT)
 700 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx);
 701 #else
 702 static inline
 703 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx)
 704 {
 705         return -ENOSYS;
 706 }
 707 #endif
 708 #ifdef CONFIG_PREEMPT_RT_FULL
 709 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx);
 710 #else
 711 static inline
 712 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx)
 713 {
 714         return -ENOSYS;
 715 }
 716 #endif
 717
 718 int lttng_add_callstack_to_ctx(struct lttng_ctx **ctx, int type);
 719
 720 #if defined(CONFIG_PERF_EVENTS) && (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33))
 721 int lttng_add_perf_counter_to_ctx(uint32_t type,
 722                                   uint64_t config,
 723                                   const char *name,
 724                                   struct lttng_ctx **ctx);
 725 int lttng_cpuhp_perf_counter_online(unsigned int cpu,
 726                 struct lttng_cpuhp_node *node);
 727 int lttng_cpuhp_perf_counter_dead(unsigned int cpu,
 728                 struct lttng_cpuhp_node *node);
 729 #else
 730 static inline
 731 int lttng_add_perf_counter_to_ctx(uint32_t type,
 732                                   uint64_t config,
 733                                   const char *name,
 734                                   struct lttng_ctx **ctx)
 735 {
 736         return -ENOSYS;
 737 }
 738 static inline
 739 int lttng_cpuhp_perf_counter_online(unsigned int cpu,
 740                 struct lttng_cpuhp_node *node)
 741 {
 742         return 0;
 743 }
 744 static inline
 745 int lttng_cpuhp_perf_counter_dead(unsigned int cpu,
 746                 struct lttng_cpuhp_node *node)
 747 {
 748         return 0;
 749 }
 750 #endif
 751
 752 int lttng_logger_init(void);
 753 void lttng_logger_exit(void);
 754
 755 extern int lttng_statedump_start(struct lttng_session *session);
 756
 757 #ifdef CONFIG_KPROBES
 758 int lttng_kprobes_register(const char *name,
 759                 const char *symbol_name,
 760                 uint64_t offset,
 761                 uint64_t addr,
 762                 struct lttng_event *event);
 763 void lttng_kprobes_unregister(struct lttng_event *event);
 764 void lttng_kprobes_destroy_private(struct lttng_event *event);
 765 #else
 766 static inline
 767 int lttng_kprobes_register(const char *name,
 768                 const char *symbol_name,
 769                 uint64_t offset,
 770                 uint64_t addr,
 771                 struct lttng_event *event)
 772 {
 773         return -ENOSYS;
 774 }
 775
 776 static inline
 777 void lttng_kprobes_unregister(struct lttng_event *event)
 778 {
 779 }
 780
 781 static inline
 782 void lttng_kprobes_destroy_private(struct lttng_event *event)
 783 {
 784 }
 785 #endif
 786
 787 #ifdef CONFIG_KRETPROBES
 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 void lttng_kretprobes_unregister(struct lttng_event *event);
 795 void lttng_kretprobes_destroy_private(struct lttng_event *event);
 796 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
 797         int enable);
 798 #else
 799 static inline
 800 int lttng_kretprobes_register(const char *name,
 801                 const char *symbol_name,
 802                 uint64_t offset,
 803                 uint64_t addr,
 804                 struct lttng_event *event_entry,
 805                 struct lttng_event *event_exit)
 806 {
 807         return -ENOSYS;
 808 }
 809
 810 static inline
 811 void lttng_kretprobes_unregister(struct lttng_event *event)
 812 {
 813 }
 814
 815 static inline
 816 void lttng_kretprobes_destroy_private(struct lttng_event *event)
 817 {
 818 }
 819
 820 static inline
 821 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
 822         int enable)
 823 {
 824         return -ENOSYS;
 825 }
 826 #endif
 827
 828 #if defined(CONFIG_DYNAMIC_FTRACE) && !defined(LTTNG_FTRACE_MISSING_HEADER)
 829 int lttng_ftrace_register(const char *name,
 830                           const char *symbol_name,
 831                           struct lttng_event *event);
 832 void lttng_ftrace_unregister(struct lttng_event *event);
 833 void lttng_ftrace_destroy_private(struct lttng_event *event);
 834 #else
 835 static inline
 836 int lttng_ftrace_register(const char *name,
 837                           const char *symbol_name,
 838                           struct lttng_event *event)
 839 {
 840         return -ENOSYS;
 841 }
 842
 843 static inline
 844 void lttng_ftrace_unregister(struct lttng_event *event)
 845 {
 846 }
 847
 848 static inline
 849 void lttng_ftrace_destroy_private(struct lttng_event *event)
 850 {
 851 }
 852 #endif
 853
 854 int lttng_calibrate(struct lttng_kernel_calibrate *calibrate);
 855
 856 extern const struct file_operations lttng_tracepoint_list_fops;
 857 extern const struct file_operations lttng_syscall_list_fops;
 858
 859 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35))
 860 #define TRACEPOINT_HAS_DATA_ARG
 861 #endif
 862
 863 #endif /* _LTTNG_EVENTS_H */