include/ust/lttng-events.h

   1 #ifndef _UST_LTTNG_EVENTS_H
   2 #define _UST_LTTNG_EVENTS_H
   3
   4 /*
   5  * ust/lttng-events.h
   6  *
   7  * Copyright 2010 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   8  *
   9  * Holds LTTng per-session event registry.
  10  *
  11  * Dual LGPL v2.1/GPL v2 license.
  12  */
  13
  14 #include <urcu/list.h>
  15 #include <uuid/uuid.h>
  16 #include <stdint.h>
  17 #include <ust/lttng-ust-abi.h>
  18 #include <ust/lttng-tracer.h>
  19 #include <endian.h>
  20 #include <float.h>
  21
  22 struct ltt_channel;
  23 struct ltt_session;
  24 struct lib_ring_buffer_ctx;
  25
  26 /* Type description */
  27
  28 /* Update the astract_types name table in lttng-types.c along with this enum */
  29 enum abstract_types {
  30         atype_integer,
  31         atype_enum,
  32         atype_array,
  33         atype_sequence,
  34         atype_string,
  35         atype_float,
  36         NR_ABSTRACT_TYPES,
  37 };
  38
  39 /* Update the string_encodings name table in lttng-types.c along with this enum */
  40 enum lttng_string_encodings {
  41         lttng_encode_none = 0,
  42         lttng_encode_UTF8 = 1,
  43         lttng_encode_ASCII = 2,
  44         NR_STRING_ENCODINGS,
  45 };
  46
  47 struct lttng_enum_entry {
  48         unsigned long long start, end;  /* start and end are inclusive */
  49         const char *string;
  50 };
  51
  52 #define __type_integer(_type, _byte_order, _base, _encoding)    \
  53         {                                                       \
  54             .atype = atype_integer,                             \
  55             .u.basic.integer =                                  \
  56                 {                                               \
  57                   .size = sizeof(_type) * CHAR_BIT,             \
  58                   .alignment = lttng_alignof(_type) * CHAR_BIT, \
  59                   .signedness = lttng_is_signed_type(_type),    \
  60                   .reverse_byte_order = _byte_order != __BYTE_ORDER,    \
  61                   .base = _base,                                \
  62                   .encoding = lttng_encode_##_encoding,         \
  63                 },                                              \
  64         }                                                       \
  65
  66 struct lttng_integer_type {
  67         unsigned int size;              /* in bits */
  68         unsigned short alignment;       /* in bits */
  69         unsigned int signedness:1;
  70         unsigned int reverse_byte_order:1;
  71         unsigned int base;              /* 2, 8, 10, 16, for pretty print */
  72         enum lttng_string_encodings encoding;
  73 };
  74
  75 #define _float_mant_dig(_type)                                          \
  76         (sizeof(_type) == sizeof(float) ? FLT_MANT_DIG                  \
  77                 : (sizeof(_type) == sizeof(double) ? DBL_MANT_DIG       \
  78                 : (sizeof(_type) == sizeof(long double) ? LDBL_MANT_DIG \
  79                 : 0)))
  80
  81 #define __type_float(_type)                                     \
  82         {                                                       \
  83             .atype = atype_float,                               \
  84             .u.basic._float =                                   \
  85                 {                                               \
  86                   .exp_dig = sizeof(_type) * CHAR_BIT           \
  87                                 - _float_mant_dig(_type),       \
  88                   .mant_dig = _float_mant_dig(_type),           \
  89                   .alignment = lttng_alignof(_type) * CHAR_BIT, \
  90                   .reverse_byte_order = __BYTE_ORDER != __FLOAT_WORD_ORDER, \
  91                 },                                              \
  92         }                                                       \
  93
  94 struct lttng_float_type {
  95         unsigned int exp_dig;           /* exponent digits, in bits */
  96         unsigned int mant_dig;          /* mantissa digits, in bits */
  97         unsigned short alignment;       /* in bits */
  98         unsigned int reverse_byte_order:1;
  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         struct lttng_float_type _float;
 110 };
 111
 112 struct lttng_basic_type {
 113         enum abstract_types atype;
 114         union {
 115                 union _lttng_basic_type basic;
 116         } u;
 117 };
 118
 119 struct lttng_type {
 120         enum abstract_types atype;
 121         union {
 122                 union _lttng_basic_type basic;
 123                 struct {
 124                         struct lttng_basic_type elem_type;
 125                         unsigned int length;            /* num. elems. */
 126                 } array;
 127                 struct {
 128                         struct lttng_basic_type length_type;
 129                         struct lttng_basic_type elem_type;
 130                 } sequence;
 131         } u;
 132 };
 133
 134 struct lttng_enum {
 135         const char *name;
 136         struct lttng_type container_type;
 137         const struct lttng_enum_entry *entries;
 138         unsigned int len;
 139 };
 140
 141 /* Event field description */
 142
 143 struct lttng_event_field {
 144         const char *name;
 145         struct lttng_type type;
 146 };
 147
 148 struct lttng_ctx_field {
 149         struct lttng_event_field event_field;
 150         size_t (*get_size)(size_t offset);
 151         void (*record)(struct lttng_ctx_field *field,
 152                        struct lib_ring_buffer_ctx *ctx,
 153                        struct ltt_channel *chan);
 154         union {
 155         } u;
 156         void (*destroy)(struct lttng_ctx_field *field);
 157 };
 158
 159 struct lttng_ctx {
 160         struct lttng_ctx_field *fields;
 161         unsigned int nr_fields;
 162         unsigned int allocated_fields;
 163 };
 164
 165 struct lttng_event_desc {
 166         const char *name;
 167         void *probe_callback;
 168         const struct lttng_event_ctx *ctx;      /* context */
 169         const struct lttng_event_field *fields; /* event payload */
 170         unsigned int nr_fields;
 171 };
 172
 173 struct lttng_probe_desc {
 174         const struct lttng_event_desc *event_desc;
 175         unsigned int nr_events;
 176         struct cds_list_head head;              /* chain registered probes */
 177 };
 178
 179 struct ust_pending_probe;
 180
 181 /*
 182  * ltt_event structure is referred to by the tracing fast path. It must be
 183  * kept small.
 184  */
 185 struct ltt_event {
 186         unsigned int id;
 187         struct ltt_channel *chan;
 188         int enabled;
 189         const struct lttng_event_desc *desc;
 190         void *filter;
 191         struct lttng_ctx *ctx;
 192         enum lttng_ust_instrumentation instrumentation;
 193         union {
 194         } u;
 195         struct cds_list_head list;              /* Event list */
 196         struct ust_pending_probe *pending_probe;
 197         int metadata_dumped:1;
 198 };
 199
 200 struct channel;
 201 struct shm_handle;
 202
 203 struct ltt_channel_ops {
 204         struct ltt_channel *(*channel_create)(const char *name,
 205                                 struct ltt_channel *ltt_chan,
 206                                 void *buf_addr,
 207                                 size_t subbuf_size, size_t num_subbuf,
 208                                 unsigned int switch_timer_interval,
 209                                 unsigned int read_timer_interval,
 210                                 int *shm_fd, int *wait_fd,
 211                                 uint64_t *memory_map_size);
 212         void (*channel_destroy)(struct ltt_channel *ltt_chan);
 213         struct lib_ring_buffer *(*buffer_read_open)(struct channel *chan,
 214                                 struct shm_handle *handle,
 215                                 int *shm_fd, int *wait_fd,
 216                                 uint64_t *memory_map_size);
 217         void (*buffer_read_close)(struct lib_ring_buffer *buf,
 218                                 struct shm_handle *handle);
 219         int (*event_reserve)(struct lib_ring_buffer_ctx *ctx,
 220                              uint32_t event_id);
 221         void (*event_commit)(struct lib_ring_buffer_ctx *ctx);
 222         void (*event_write)(struct lib_ring_buffer_ctx *ctx, const void *src,
 223                             size_t len);
 224         /*
 225          * packet_avail_size returns the available size in the current
 226          * packet. Note that the size returned is only a hint, since it
 227          * may change due to concurrent writes.
 228          */
 229         size_t (*packet_avail_size)(struct channel *chan,
 230                                     struct shm_handle *handle);
 231         //wait_queue_head_t *(*get_reader_wait_queue)(struct channel *chan);
 232         //wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
 233         int (*is_finalized)(struct channel *chan);
 234         int (*is_disabled)(struct channel *chan);
 235 };
 236
 237 struct ltt_channel {
 238         unsigned int id;
 239         struct channel *chan;           /* Channel buffers */
 240         int enabled;
 241         struct lttng_ctx *ctx;
 242         /* Event ID management */
 243         struct ltt_session *session;
 244         int objd;                       /* Object associated to channel */
 245         unsigned int free_event_id;     /* Next event ID to allocate */
 246         unsigned int used_event_id;     /* Max allocated event IDs */
 247         struct cds_list_head list;      /* Channel list */
 248         struct ltt_channel_ops *ops;
 249         int header_type;                /* 0: unset, 1: compact, 2: large */
 250         struct shm_handle *handle;      /* shared-memory handle */
 251         int metadata_dumped:1;
 252 };
 253
 254 struct ltt_session {
 255         int active;                     /* Is trace session active ? */
 256         int been_active;                /* Has trace session been active ? */
 257         int objd;                       /* Object associated to session */
 258         struct ltt_channel *metadata;   /* Metadata channel */
 259         struct cds_list_head chan;      /* Channel list head */
 260         struct cds_list_head events;    /* Event list head */
 261         struct cds_list_head list;      /* Session list */
 262         unsigned int free_chan_id;      /* Next chan ID to allocate */
 263         uuid_t uuid;                    /* Trace session unique ID */
 264         int metadata_dumped:1;
 265 };
 266
 267 struct ltt_transport {
 268         char *name;
 269         struct cds_list_head node;
 270         struct ltt_channel_ops ops;
 271 };
 272
 273 struct ltt_session *ltt_session_create(void);
 274 int ltt_session_enable(struct ltt_session *session);
 275 int ltt_session_disable(struct ltt_session *session);
 276 void ltt_session_destroy(struct ltt_session *session);
 277
 278 struct ltt_channel *ltt_channel_create(struct ltt_session *session,
 279                                        const char *transport_name,
 280                                        void *buf_addr,
 281                                        size_t subbuf_size, size_t num_subbuf,
 282                                        unsigned int switch_timer_interval,
 283                                        unsigned int read_timer_interval,
 284                                        int *shm_fd, int *wait_fd,
 285                                        uint64_t *memory_map_size);
 286 struct ltt_channel *ltt_global_channel_create(struct ltt_session *session,
 287                                        int overwrite, void *buf_addr,
 288                                        size_t subbuf_size, size_t num_subbuf,
 289                                        unsigned int switch_timer_interval,
 290                                        unsigned int read_timer_interval,
 291                                        int *shm_fd, int *wait_fd,
 292                                        uint64_t *memory_map_size);
 293
 294 struct ltt_event *ltt_event_create(struct ltt_channel *chan,
 295                                    struct lttng_ust_event *event_param,
 296                                    void *filter);
 297
 298 int ltt_channel_enable(struct ltt_channel *channel);
 299 int ltt_channel_disable(struct ltt_channel *channel);
 300 int ltt_event_enable(struct ltt_event *event);
 301 int ltt_event_disable(struct ltt_event *event);
 302
 303 void ltt_transport_register(struct ltt_transport *transport);
 304 void ltt_transport_unregister(struct ltt_transport *transport);
 305
 306 void synchronize_trace(void);
 307 //int ltt_debugfs_abi_init(void);
 308 //void ltt_debugfs_abi_exit(void);
 309
 310 int ltt_probe_register(struct lttng_probe_desc *desc);
 311 void ltt_probe_unregister(struct lttng_probe_desc *desc);
 312 int pending_probe_fix_events(const struct lttng_event_desc *desc);
 313 const struct lttng_event_desc *ltt_event_get(const char *name);
 314 void ltt_event_put(const struct lttng_event_desc *desc);
 315 int ltt_probes_init(void);
 316 void ltt_probes_exit(void);
 317 struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx);
 318 void lttng_remove_context_field(struct lttng_ctx **ctx,
 319                                 struct lttng_ctx_field *field);
 320 void lttng_destroy_context(struct lttng_ctx *ctx);
 321 int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
 322
 323 //extern const struct file_operations lttng_tracepoint_list_fops;
 324
 325 #endif /* _UST_LTTNG_EVENTS_H */