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