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