lttng-events.h

   1 #ifndef _LTTNG_EVENTS_H
   2 #define _LTTNG_EVENTS_H
   3
   4 /*
   5  * lttng-events.h
   6  *
   7  * Holds LTTng per-session event registry.
   8  *
   9  * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  10  *
  11  * This library is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU Lesser General Public
  13  * License as published by the Free Software Foundation; only
  14  * version 2.1 of the License.
  15  *
  16  * This library is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  19  * Lesser General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU Lesser General Public
  22  * License along with this library; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  24  */
  25
  26 #include <linux/version.h>
  27 #include <linux/list.h>
  28 #include <linux/kprobes.h>
  29 #include <linux/kref.h>
  30 #include <wrapper/uuid.h>
  31 #include <lttng-tracer.h>
  32 #include <lttng-abi.h>
  33 #include <lttng-abi-old.h>
  34
  35 #define lttng_is_signed_type(type)      (((type)(-1)) < 0)
  36
  37 struct lttng_channel;
  38 struct lttng_session;
  39 struct lttng_metadata_cache;
  40 struct lib_ring_buffer_ctx;
  41 struct perf_event;
  42 struct perf_event_attr;
  43 struct lib_ring_buffer_config;
  44
  45 /* Type description */
  46
  47 enum abstract_types {
  48         atype_integer,
  49         atype_enum,
  50         atype_array,
  51         atype_sequence,
  52         atype_string,
  53         atype_struct,
  54         atype_array_compound,           /* Array of compound types. */
  55         atype_sequence_compound,        /* Sequence of compound types. */
  56         atype_variant,
  57         NR_ABSTRACT_TYPES,
  58 };
  59
  60 enum lttng_string_encodings {
  61         lttng_encode_none = 0,
  62         lttng_encode_UTF8 = 1,
  63         lttng_encode_ASCII = 2,
  64         NR_STRING_ENCODINGS,
  65 };
  66
  67 enum channel_type {
  68         PER_CPU_CHANNEL,
  69         METADATA_CHANNEL,
  70 };
  71
  72 struct lttng_enum_entry {
  73         unsigned long long start, end;  /* start and end are inclusive */
  74         const char *string;
  75 };
  76
  77 #define __type_integer(_type, _size, _alignment, _signedness,   \
  78                 _byte_order, _base, _encoding)  \
  79         {                                                       \
  80             .atype = atype_integer,                             \
  81             .u.basic.integer =                                  \
  82                 {                                               \
  83                   .size = (_size) ? : sizeof(_type) * CHAR_BIT, \
  84                   .alignment = (_alignment) ? : lttng_alignof(_type) * CHAR_BIT, \
  85                   .signedness = (_signedness) >= 0 ? (_signedness) : lttng_is_signed_type(_type), \
  86                   .reverse_byte_order = _byte_order != __BYTE_ORDER, \
  87                   .base = _base,                                \
  88                   .encoding = lttng_encode_##_encoding,         \
  89                 },                                              \
  90         }                                                       \
  91
  92 struct lttng_integer_type {
  93         unsigned int size;              /* in bits */
  94         unsigned short alignment;       /* in bits */
  95         unsigned int signedness:1,
  96                 reverse_byte_order:1;
  97         unsigned int base;              /* 2, 8, 10, 16, for pretty print */
  98         enum lttng_string_encodings encoding;
  99 };
 100
 101 union _lttng_basic_type {
 102         struct lttng_integer_type integer;
 103         struct {
 104                 const char *name;
 105         } enumeration;
 106         struct {
 107                 enum lttng_string_encodings encoding;
 108         } string;
 109 };
 110
 111 struct lttng_basic_type {
 112         enum abstract_types atype;
 113         union {
 114                 union _lttng_basic_type basic;
 115         } u;
 116 };
 117
 118 struct lttng_type {
 119         enum abstract_types atype;
 120         union {
 121                 union _lttng_basic_type basic;
 122                 struct {
 123                         struct lttng_basic_type elem_type;
 124                         unsigned int length;            /* num. elems. */
 125                         unsigned int elem_alignment;    /* alignment override */
 126                 } array;
 127                 struct {
 128                         struct lttng_basic_type length_type;
 129                         struct lttng_basic_type elem_type;
 130                         unsigned int elem_alignment;    /* alignment override */
 131                 } sequence;
 132                 struct {
 133                         uint32_t nr_fields;
 134                         struct lttng_event_field *fields; /* Array of fields. */
 135                 } _struct;
 136                 struct {
 137                         struct lttng_type *elem_type;
 138                         unsigned int length;            /* num. elems. */
 139                 } array_compound;
 140                 struct {
 141                         struct lttng_type *elem_type;
 142                         const char *length_name;
 143                 } sequence_compound;
 144                 struct {
 145                         const char *tag_name;
 146                         struct lttng_event_field *choices; /* Array of fields. */
 147                         uint32_t nr_choices;
 148                 } variant;
 149         } u;
 150 };
 151
 152 struct lttng_enum {
 153         const char *name;
 154         struct lttng_type container_type;
 155         const struct lttng_enum_entry *entries;
 156         unsigned int len;
 157 };
 158
 159 /* Event field description */
 160
 161 struct lttng_event_field {
 162         const char *name;
 163         struct lttng_type type;
 164         unsigned int nowrite:1,         /* do not write into trace */
 165                         user:1;         /* fetch from user-space */
 166 };
 167
 168 union lttng_ctx_value {
 169         int64_t s64;
 170         const char *str;
 171         double d;
 172 };
 173
 174 /*
 175  * We need to keep this perf counter field separately from struct
 176  * lttng_ctx_field because cpu hotplug needs fixed-location addresses.
 177  */
 178 struct lttng_perf_counter_field {
 179         struct notifier_block nb;
 180         int hp_enable;
 181         struct perf_event_attr *attr;
 182         struct perf_event **e;  /* per-cpu array */
 183 };
 184
 185 struct lttng_probe_ctx {
 186         struct lttng_event *event;
 187         uint8_t interruptible;
 188 };
 189
 190 struct lttng_ctx_field {
 191         struct lttng_event_field event_field;
 192         size_t (*get_size)(size_t offset);
 193         void (*record)(struct lttng_ctx_field *field,
 194                        struct lib_ring_buffer_ctx *ctx,
 195                        struct lttng_channel *chan);
 196         void (*get_value)(struct lttng_ctx_field *field,
 197                          struct lttng_probe_ctx *lttng_probe_ctx,
 198                          union lttng_ctx_value *value);
 199         union {
 200                 struct lttng_perf_counter_field *perf_counter;
 201         } u;
 202         void (*destroy)(struct lttng_ctx_field *field);
 203 };
 204
 205 struct lttng_ctx {
 206         struct lttng_ctx_field *fields;
 207         unsigned int nr_fields;
 208         unsigned int allocated_fields;
 209         size_t largest_align;   /* in bytes */
 210 };
 211
 212 struct lttng_event_desc {
 213         const char *name;               /* lttng-modules name */
 214         const char *kname;              /* Linux kernel name (tracepoints) */
 215         void *probe_callback;
 216         const struct lttng_event_ctx *ctx;      /* context */
 217         const struct lttng_event_field *fields; /* event payload */
 218         unsigned int nr_fields;
 219         struct module *owner;
 220 };
 221
 222 struct lttng_probe_desc {
 223         const char *provider;
 224         const struct lttng_event_desc **event_desc;
 225         unsigned int nr_events;
 226         struct list_head head;                  /* chain registered probes */
 227         struct list_head lazy_init_head;
 228         int lazy;                               /* lazy registration */
 229 };
 230
 231 struct lttng_krp;                               /* Kretprobe handling */
 232
 233 enum lttng_event_type {
 234         LTTNG_TYPE_EVENT = 0,
 235         LTTNG_TYPE_ENABLER = 1,
 236 };
 237
 238 struct lttng_filter_bytecode_node {
 239         struct list_head node;
 240         struct lttng_enabler *enabler;
 241         /*
 242          * struct lttng_kernel_filter_bytecode has var. sized array, must be
 243          * last field.
 244          */
 245         struct lttng_kernel_filter_bytecode bc;
 246 };
 247
 248 /*
 249  * Filter return value masks.
 250  */
 251 enum lttng_filter_ret {
 252         LTTNG_FILTER_DISCARD = 0,
 253         LTTNG_FILTER_RECORD_FLAG = (1ULL << 0),
 254         /* Other bits are kept for future use. */
 255 };
 256
 257 struct lttng_bytecode_runtime {
 258         /* Associated bytecode */
 259         struct lttng_filter_bytecode_node *bc;
 260         uint64_t (*filter)(void *filter_data, struct lttng_probe_ctx *lttng_probe_ctx,
 261                         const char *filter_stack_data);
 262         int link_failed;
 263         struct list_head node;  /* list of bytecode runtime in event */
 264 };
 265
 266 /*
 267  * Objects in a linked-list of enablers, owned by an event.
 268  */
 269 struct lttng_enabler_ref {
 270         struct list_head node;                  /* enabler ref list */
 271         struct lttng_enabler *ref;              /* backward ref */
 272 };
 273
 274 /*
 275  * lttng_event structure is referred to by the tracing fast path. It must be
 276  * kept small.
 277  */
 278 struct lttng_event {
 279         enum lttng_event_type evtype;   /* First field. */
 280         unsigned int id;
 281         struct lttng_channel *chan;
 282         int enabled;
 283         const struct lttng_event_desc *desc;
 284         void *filter;
 285         struct lttng_ctx *ctx;
 286         enum lttng_kernel_instrumentation instrumentation;
 287         union {
 288                 struct {
 289                         struct kprobe kp;
 290                         char *symbol_name;
 291                 } kprobe;
 292                 struct {
 293                         struct lttng_krp *lttng_krp;
 294                         char *symbol_name;
 295                 } kretprobe;
 296                 struct {
 297                         char *symbol_name;
 298                 } ftrace;
 299         } u;
 300         struct list_head list;          /* Event list in session */
 301         unsigned int metadata_dumped:1;
 302
 303         /* Backward references: list of lttng_enabler_ref (ref to enablers) */
 304         struct list_head enablers_ref_head;
 305         struct hlist_node hlist;        /* session ht of events */
 306         int registered;                 /* has reg'd tracepoint probe */
 307         /* list of struct lttng_bytecode_runtime, sorted by seqnum */
 308         struct list_head bytecode_runtime_head;
 309         int has_enablers_without_bytecode;
 310 };
 311
 312 enum lttng_enabler_type {
 313         LTTNG_ENABLER_WILDCARD,
 314         LTTNG_ENABLER_NAME,
 315 };
 316
 317 /*
 318  * Enabler field, within whatever object is enabling an event. Target of
 319  * backward reference.
 320  */
 321 struct lttng_enabler {
 322         enum lttng_event_type evtype;   /* First field. */
 323
 324         enum lttng_enabler_type type;
 325
 326         struct list_head node;  /* per-session list of enablers */
 327         /* head list of struct lttng_ust_filter_bytecode_node */
 328         struct list_head filter_bytecode_head;
 329
 330         struct lttng_kernel_event event_param;
 331         struct lttng_channel *chan;
 332         struct lttng_ctx *ctx;
 333         unsigned int enabled:1;
 334 };
 335
 336 struct lttng_channel_ops {
 337         struct channel *(*channel_create)(const char *name,
 338                                 struct lttng_channel *lttng_chan,
 339                                 void *buf_addr,
 340                                 size_t subbuf_size, size_t num_subbuf,
 341                                 unsigned int switch_timer_interval,
 342                                 unsigned int read_timer_interval);
 343         void (*channel_destroy)(struct channel *chan);
 344         struct lib_ring_buffer *(*buffer_read_open)(struct channel *chan);
 345         int (*buffer_has_read_closed_stream)(struct channel *chan);
 346         void (*buffer_read_close)(struct lib_ring_buffer *buf);
 347         int (*event_reserve)(struct lib_ring_buffer_ctx *ctx,
 348                              uint32_t event_id);
 349         void (*event_commit)(struct lib_ring_buffer_ctx *ctx);
 350         void (*event_write)(struct lib_ring_buffer_ctx *ctx, const void *src,
 351                             size_t len);
 352         void (*event_write_from_user)(struct lib_ring_buffer_ctx *ctx,
 353                                       const void *src, size_t len);
 354         void (*event_memset)(struct lib_ring_buffer_ctx *ctx,
 355                              int c, size_t len);
 356         void (*event_strcpy)(struct lib_ring_buffer_ctx *ctx, const char *src,
 357                              size_t len);
 358         void (*event_strcpy_from_user)(struct lib_ring_buffer_ctx *ctx,
 359                                        const char __user *src, size_t len);
 360         /*
 361          * packet_avail_size returns the available size in the current
 362          * packet. Note that the size returned is only a hint, since it
 363          * may change due to concurrent writes.
 364          */
 365         size_t (*packet_avail_size)(struct channel *chan);
 366         wait_queue_head_t *(*get_writer_buf_wait_queue)(struct channel *chan, int cpu);
 367         wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
 368         int (*is_finalized)(struct channel *chan);
 369         int (*is_disabled)(struct channel *chan);
 370         int (*timestamp_begin) (const struct lib_ring_buffer_config *config,
 371                         struct lib_ring_buffer *bufb,
 372                         uint64_t *timestamp_begin);
 373         int (*timestamp_end) (const struct lib_ring_buffer_config *config,
 374                         struct lib_ring_buffer *bufb,
 375                         uint64_t *timestamp_end);
 376         int (*events_discarded) (const struct lib_ring_buffer_config *config,
 377                         struct lib_ring_buffer *bufb,
 378                         uint64_t *events_discarded);
 379         int (*content_size) (const struct lib_ring_buffer_config *config,
 380                         struct lib_ring_buffer *bufb,
 381                         uint64_t *content_size);
 382         int (*packet_size) (const struct lib_ring_buffer_config *config,
 383                         struct lib_ring_buffer *bufb,
 384                         uint64_t *packet_size);
 385         int (*stream_id) (const struct lib_ring_buffer_config *config,
 386                         struct lib_ring_buffer *bufb,
 387                         uint64_t *stream_id);
 388         int (*current_timestamp) (const struct lib_ring_buffer_config *config,
 389                         struct lib_ring_buffer *bufb,
 390                         uint64_t *ts);
 391         int (*sequence_number) (const struct lib_ring_buffer_config *config,
 392                         struct lib_ring_buffer *bufb,
 393                         uint64_t *seq);
 394         int (*instance_id) (const struct lib_ring_buffer_config *config,
 395                         struct lib_ring_buffer *bufb,
 396                         uint64_t *id);
 397 };
 398
 399 struct lttng_transport {
 400         char *name;
 401         struct module *owner;
 402         struct list_head node;
 403         struct lttng_channel_ops ops;
 404 };
 405
 406 struct lttng_syscall_filter;
 407
 408 #define LTTNG_EVENT_HT_BITS             12
 409 #define LTTNG_EVENT_HT_SIZE             (1U << LTTNG_EVENT_HT_BITS)
 410
 411 struct lttng_event_ht {
 412         struct hlist_head table[LTTNG_EVENT_HT_SIZE];
 413 };
 414
 415 struct lttng_channel {
 416         unsigned int id;
 417         struct channel *chan;           /* Channel buffers */
 418         int enabled;
 419         struct lttng_ctx *ctx;
 420         /* Event ID management */
 421         struct lttng_session *session;
 422         struct file *file;              /* File associated to channel */
 423         unsigned int free_event_id;     /* Next event ID to allocate */
 424         struct list_head list;          /* Channel list */
 425         struct lttng_channel_ops *ops;
 426         struct lttng_transport *transport;
 427         struct lttng_event **sc_table;  /* for syscall tracing */
 428         struct lttng_event **compat_sc_table;
 429         struct lttng_event **sc_exit_table;     /* for syscall exit tracing */
 430         struct lttng_event **compat_sc_exit_table;
 431         struct lttng_event *sc_unknown; /* for unknown syscalls */
 432         struct lttng_event *sc_compat_unknown;
 433         struct lttng_event *sc_exit_unknown;
 434         struct lttng_event *compat_sc_exit_unknown;
 435         struct lttng_syscall_filter *sc_filter;
 436         int header_type;                /* 0: unset, 1: compact, 2: large */
 437         enum channel_type channel_type;
 438         unsigned int metadata_dumped:1,
 439                 sys_enter_registered:1,
 440                 sys_exit_registered:1,
 441                 syscall_all:1,
 442                 tstate:1;               /* Transient enable state */
 443 };
 444
 445 struct lttng_metadata_stream {
 446         void *priv;                     /* Ring buffer private data */
 447         struct lttng_metadata_cache *metadata_cache;
 448         unsigned int metadata_in;       /* Bytes read from the cache */
 449         unsigned int metadata_out;      /* Bytes consumed from stream */
 450         int finalized;                  /* Has channel been finalized */
 451         wait_queue_head_t read_wait;    /* Reader buffer-level wait queue */
 452         struct list_head list;          /* Stream list */
 453         struct lttng_transport *transport;
 454         uint64_t version;               /* Current version of the metadata cache */
 455 };
 456
 457 #define LTTNG_DYNAMIC_LEN_STACK_SIZE    128
 458
 459 struct lttng_dynamic_len_stack {
 460         size_t stack[LTTNG_DYNAMIC_LEN_STACK_SIZE];
 461         size_t offset;
 462 };
 463
 464 DECLARE_PER_CPU(struct lttng_dynamic_len_stack, lttng_dynamic_len_stack);
 465
 466 /*
 467  * struct lttng_pid_tracker declared in header due to deferencing of *v
 468  * in RCU_INITIALIZER(v).
 469  */
 470 #define LTTNG_PID_HASH_BITS     6
 471 #define LTTNG_PID_TABLE_SIZE    (1 << LTTNG_PID_HASH_BITS)
 472
 473 struct lttng_pid_tracker {
 474         struct hlist_head pid_hash[LTTNG_PID_TABLE_SIZE];
 475 };
 476
 477 struct lttng_pid_hash_node {
 478         struct hlist_node hlist;
 479         int pid;
 480 };
 481
 482 struct lttng_session {
 483         int active;                     /* Is trace session active ? */
 484         int been_active;                /* Has trace session been active ? */
 485         struct file *file;              /* File associated to session */
 486         struct list_head chan;          /* Channel list head */
 487         struct list_head events;        /* Event list head */
 488         struct list_head list;          /* Session list */
 489         unsigned int free_chan_id;      /* Next chan ID to allocate */
 490         uuid_le uuid;                   /* Trace session unique ID */
 491         struct lttng_metadata_cache *metadata_cache;
 492         struct lttng_pid_tracker *pid_tracker;
 493         unsigned int metadata_dumped:1,
 494                 tstate:1;               /* Transient enable state */
 495         /* List of enablers */
 496         struct list_head enablers_head;
 497         /* Hash table of events */
 498         struct lttng_event_ht events_ht;
 499 };
 500
 501 struct lttng_metadata_cache {
 502         char *data;                     /* Metadata cache */
 503         unsigned int cache_alloc;       /* Metadata allocated size (bytes) */
 504         unsigned int metadata_written;  /* Number of bytes written in metadata cache */
 505         struct kref refcount;           /* Metadata cache usage */
 506         struct list_head metadata_stream;       /* Metadata stream list */
 507         uuid_le uuid;                   /* Trace session unique ID (copy) */
 508         struct mutex lock;              /* Produce/consume lock */
 509         uint64_t version;               /* Current version of the metadata */
 510 };
 511
 512 void lttng_lock_sessions(void);
 513 void lttng_unlock_sessions(void);
 514
 515 struct list_head *lttng_get_probe_list_head(void);
 516
 517 struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type,
 518                 struct lttng_kernel_event *event_param,
 519                 struct lttng_channel *chan);
 520
 521 int lttng_enabler_enable(struct lttng_enabler *enabler);
 522 int lttng_enabler_disable(struct lttng_enabler *enabler);
 523 int lttng_fix_pending_events(void);
 524 int lttng_session_active(void);
 525
 526 struct lttng_session *lttng_session_create(void);
 527 int lttng_session_enable(struct lttng_session *session);
 528 int lttng_session_disable(struct lttng_session *session);
 529 void lttng_session_destroy(struct lttng_session *session);
 530 int lttng_session_metadata_regenerate(struct lttng_session *session);
 531 void metadata_cache_destroy(struct kref *kref);
 532
 533 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
 534                                        const char *transport_name,
 535                                        void *buf_addr,
 536                                        size_t subbuf_size, size_t num_subbuf,
 537                                        unsigned int switch_timer_interval,
 538                                        unsigned int read_timer_interval,
 539                                        enum channel_type channel_type);
 540 struct lttng_channel *lttng_global_channel_create(struct lttng_session *session,
 541                                        int overwrite, void *buf_addr,
 542                                        size_t subbuf_size, size_t num_subbuf,
 543                                        unsigned int switch_timer_interval,
 544                                        unsigned int read_timer_interval);
 545
 546 void lttng_metadata_channel_destroy(struct lttng_channel *chan);
 547 struct lttng_event *lttng_event_create(struct lttng_channel *chan,
 548                                 struct lttng_kernel_event *event_param,
 549                                 void *filter,
 550                                 const struct lttng_event_desc *event_desc,
 551                                 enum lttng_kernel_instrumentation itype);
 552 struct lttng_event *_lttng_event_create(struct lttng_channel *chan,
 553                                 struct lttng_kernel_event *event_param,
 554                                 void *filter,
 555                                 const struct lttng_event_desc *event_desc,
 556                                 enum lttng_kernel_instrumentation itype);
 557 struct lttng_event *lttng_event_compat_old_create(struct lttng_channel *chan,
 558                 struct lttng_kernel_old_event *old_event_param,
 559                 void *filter,
 560                 const struct lttng_event_desc *internal_desc);
 561
 562 int lttng_channel_enable(struct lttng_channel *channel);
 563 int lttng_channel_disable(struct lttng_channel *channel);
 564 int lttng_event_enable(struct lttng_event *event);
 565 int lttng_event_disable(struct lttng_event *event);
 566
 567 void lttng_transport_register(struct lttng_transport *transport);
 568 void lttng_transport_unregister(struct lttng_transport *transport);
 569
 570 void synchronize_trace(void);
 571 int lttng_abi_init(void);
 572 int lttng_abi_compat_old_init(void);
 573 void lttng_abi_exit(void);
 574 void lttng_abi_compat_old_exit(void);
 575
 576 int lttng_probe_register(struct lttng_probe_desc *desc);
 577 void lttng_probe_unregister(struct lttng_probe_desc *desc);
 578 const struct lttng_event_desc *lttng_event_get(const char *name);
 579 void lttng_event_put(const struct lttng_event_desc *desc);
 580 int lttng_probes_init(void);
 581 void lttng_probes_exit(void);
 582
 583 int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
 584                 struct channel *chan);
 585
 586 int lttng_pid_tracker_get_node_pid(const struct lttng_pid_hash_node *node);
 587 struct lttng_pid_tracker *lttng_pid_tracker_create(void);
 588 void lttng_pid_tracker_destroy(struct lttng_pid_tracker *lpf);
 589 bool lttng_pid_tracker_lookup(struct lttng_pid_tracker *lpf, int pid);
 590 int lttng_pid_tracker_add(struct lttng_pid_tracker *lpf, int pid);
 591 int lttng_pid_tracker_del(struct lttng_pid_tracker *lpf, int pid);
 592
 593 int lttng_session_track_pid(struct lttng_session *session, int pid);
 594 int lttng_session_untrack_pid(struct lttng_session *session, int pid);
 595
 596 int lttng_session_list_tracker_pids(struct lttng_session *session);
 597
 598 void lttng_clock_ref(void);
 599 void lttng_clock_unref(void);
 600
 601 #if defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
 602 int lttng_syscalls_register(struct lttng_channel *chan, void *filter);
 603 int lttng_syscalls_unregister(struct lttng_channel *chan);
 604 int lttng_syscall_filter_enable(struct lttng_channel *chan,
 605                 const char *name);
 606 int lttng_syscall_filter_disable(struct lttng_channel *chan,
 607                 const char *name);
 608 long lttng_channel_syscall_mask(struct lttng_channel *channel,
 609                 struct lttng_kernel_syscall_mask __user *usyscall_mask);
 610 #else
 611 static inline int lttng_syscalls_register(struct lttng_channel *chan, void *filter)
 612 {
 613         return -ENOSYS;
 614 }
 615
 616 static inline int lttng_syscalls_unregister(struct lttng_channel *chan)
 617 {
 618         return 0;
 619 }
 620
 621 static inline int lttng_syscall_filter_enable(struct lttng_channel *chan,
 622                 const char *name)
 623 {
 624         return -ENOSYS;
 625 }
 626
 627 static inline int lttng_syscall_filter_disable(struct lttng_channel *chan,
 628                 const char *name)
 629 {
 630         return -ENOSYS;
 631 }
 632
 633 static inline long lttng_channel_syscall_mask(struct lttng_channel *channel,
 634                 struct lttng_kernel_syscall_mask __user *usyscall_mask)
 635 {
 636         return -ENOSYS;
 637 }
 638 #endif
 639
 640 void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime);
 641 int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler,
 642                 struct lttng_kernel_filter_bytecode __user *bytecode);
 643 void lttng_enabler_event_link_bytecode(struct lttng_event *event,
 644                 struct lttng_enabler *enabler);
 645
 646 int lttng_probes_init(void);
 647
 648 extern struct lttng_ctx *lttng_static_ctx;
 649
 650 int lttng_context_init(void);
 651 void lttng_context_exit(void);
 652 struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx);
 653 void lttng_context_update(struct lttng_ctx *ctx);
 654 int lttng_find_context(struct lttng_ctx *ctx, const char *name);
 655 int lttng_get_context_index(struct lttng_ctx *ctx, const char *name);
 656 void lttng_remove_context_field(struct lttng_ctx **ctx,
 657                                 struct lttng_ctx_field *field);
 658 void lttng_destroy_context(struct lttng_ctx *ctx);
 659 int lttng_add_pid_to_ctx(struct lttng_ctx **ctx);
 660 int lttng_add_cpu_id_to_ctx(struct lttng_ctx **ctx);
 661 int lttng_add_procname_to_ctx(struct lttng_ctx **ctx);
 662 int lttng_add_prio_to_ctx(struct lttng_ctx **ctx);
 663 int lttng_add_nice_to_ctx(struct lttng_ctx **ctx);
 664 int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
 665 int lttng_add_tid_to_ctx(struct lttng_ctx **ctx);
 666 int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
 667 int lttng_add_ppid_to_ctx(struct lttng_ctx **ctx);
 668 int lttng_add_vppid_to_ctx(struct lttng_ctx **ctx);
 669 int lttng_add_hostname_to_ctx(struct lttng_ctx **ctx);
 670 int lttng_add_interruptible_to_ctx(struct lttng_ctx **ctx);
 671 int lttng_add_need_reschedule_to_ctx(struct lttng_ctx **ctx);
 672 #if defined(CONFIG_PREEMPT_RT_FULL) || defined(CONFIG_PREEMPT)
 673 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx);
 674 #else
 675 static inline
 676 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx)
 677 {
 678         return -ENOSYS;
 679 }
 680 #endif
 681 #ifdef CONFIG_PREEMPT_RT_FULL
 682 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx);
 683 #else
 684 static inline
 685 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx)
 686 {
 687         return -ENOSYS;
 688 }
 689 #endif
 690 #if defined(CONFIG_PERF_EVENTS) && (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33))
 691 int lttng_add_perf_counter_to_ctx(uint32_t type,
 692                                   uint64_t config,
 693                                   const char *name,
 694                                   struct lttng_ctx **ctx);
 695 #else
 696 static inline
 697 int lttng_add_perf_counter_to_ctx(uint32_t type,
 698                                   uint64_t config,
 699                                   const char *name,
 700                                   struct lttng_ctx **ctx)
 701 {
 702         return -ENOSYS;
 703 }
 704 #endif
 705
 706 int lttng_logger_init(void);
 707 void lttng_logger_exit(void);
 708
 709 extern int lttng_statedump_start(struct lttng_session *session);
 710
 711 #ifdef CONFIG_KPROBES
 712 int lttng_kprobes_register(const char *name,
 713                 const char *symbol_name,
 714                 uint64_t offset,
 715                 uint64_t addr,
 716                 struct lttng_event *event);
 717 void lttng_kprobes_unregister(struct lttng_event *event);
 718 void lttng_kprobes_destroy_private(struct lttng_event *event);
 719 #else
 720 static inline
 721 int lttng_kprobes_register(const char *name,
 722                 const char *symbol_name,
 723                 uint64_t offset,
 724                 uint64_t addr,
 725                 struct lttng_event *event)
 726 {
 727         return -ENOSYS;
 728 }
 729
 730 static inline
 731 void lttng_kprobes_unregister(struct lttng_event *event)
 732 {
 733 }
 734
 735 static inline
 736 void lttng_kprobes_destroy_private(struct lttng_event *event)
 737 {
 738 }
 739 #endif
 740
 741 #ifdef CONFIG_KRETPROBES
 742 int lttng_kretprobes_register(const char *name,
 743                 const char *symbol_name,
 744                 uint64_t offset,
 745                 uint64_t addr,
 746                 struct lttng_event *event_entry,
 747                 struct lttng_event *event_exit);
 748 void lttng_kretprobes_unregister(struct lttng_event *event);
 749 void lttng_kretprobes_destroy_private(struct lttng_event *event);
 750 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
 751         int enable);
 752 #else
 753 static inline
 754 int lttng_kretprobes_register(const char *name,
 755                 const char *symbol_name,
 756                 uint64_t offset,
 757                 uint64_t addr,
 758                 struct lttng_event *event_entry,
 759                 struct lttng_event *event_exit)
 760 {
 761         return -ENOSYS;
 762 }
 763
 764 static inline
 765 void lttng_kretprobes_unregister(struct lttng_event *event)
 766 {
 767 }
 768
 769 static inline
 770 void lttng_kretprobes_destroy_private(struct lttng_event *event)
 771 {
 772 }
 773
 774 static inline
 775 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
 776         int enable)
 777 {
 778         return -ENOSYS;
 779 }
 780 #endif
 781
 782 #ifdef CONFIG_DYNAMIC_FTRACE
 783 int lttng_ftrace_register(const char *name,
 784                           const char *symbol_name,
 785                           struct lttng_event *event);
 786 void lttng_ftrace_unregister(struct lttng_event *event);
 787 void lttng_ftrace_destroy_private(struct lttng_event *event);
 788 #else
 789 static inline
 790 int lttng_ftrace_register(const char *name,
 791                           const char *symbol_name,
 792                           struct lttng_event *event)
 793 {
 794         return -ENOSYS;
 795 }
 796
 797 static inline
 798 void lttng_ftrace_unregister(struct lttng_event *event)
 799 {
 800 }
 801
 802 static inline
 803 void lttng_ftrace_destroy_private(struct lttng_event *event)
 804 {
 805 }
 806 #endif
 807
 808 int lttng_calibrate(struct lttng_kernel_calibrate *calibrate);
 809
 810 extern const struct file_operations lttng_tracepoint_list_fops;
 811 extern const struct file_operations lttng_syscall_list_fops;
 812
 813 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35))
 814 #define TRACEPOINT_HAS_DATA_ARG
 815 #endif
 816
 817 #endif /* _LTTNG_EVENTS_H */