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