X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=include%2Flttng%2Fust-events.h;h=41dcbaf307d27a068ea970d8dd2e34b0b8deeb42;hb=0af0bdb2f1059112521da3e2d067262f78e783d7;hp=4cc4e1e431f9442fc8625d15a3c25a614c69d33f;hpb=2e70391c18fa78eb8dfac15c0f2e43e82691f189;p=lttng-ust.git diff --git a/include/lttng/ust-events.h b/include/lttng/ust-events.h index 4cc4e1e4..41dcbaf3 100644 --- a/include/lttng/ust-events.h +++ b/include/lttng/ust-events.h @@ -43,8 +43,7 @@ extern "C" { struct lttng_channel; struct lttng_session; struct lttng_ust_lib_ring_buffer_ctx; -struct lttng_event_field; -struct lttng_event_notifier; +struct lttng_ust_event_field; struct lttng_event_notifier_group; /* @@ -84,16 +83,26 @@ enum lttng_enum_entry_options { LTTNG_ENUM_ENTRY_OPTION_IS_AUTO = 1U << 0, }; -#define LTTNG_UST_ENUM_ENTRY_PADDING 16 -struct lttng_enum_entry { +/* + * Enumeration entry description + * + * IMPORTANT: this structure is part of the ABI between the probe and + * UST. Fields need to be only added at the end, never reordered, never + * removed. + * + * The field @struct_size should be used to determine the size of the + * structure. It should be queried before using additional fields added + * at the end of the structure. + */ + +struct lttng_ust_enum_entry { + uint32_t struct_size; + struct lttng_enum_value start, end; /* start and end are inclusive */ const char *string; - union { - struct { - unsigned int options; - } LTTNG_PACKED extra; - char padding[LTTNG_UST_ENUM_ENTRY_PADDING]; - } u; + unsigned int options; + + /* End of base ABI. Fields below should be used after checking struct_size. */ }; #define __type_integer(_type, _byte_order, _base, _encoding) \ @@ -169,7 +178,7 @@ struct lttng_type { enum lttng_string_encodings encoding; } string; struct { - const struct lttng_enum_desc *desc; /* Enumeration mapping */ + const struct lttng_ust_enum_desc *desc; /* Enumeration mapping */ struct lttng_type *container_type; } enum_nestable; struct { @@ -184,7 +193,7 @@ struct lttng_type { } sequence_nestable; struct { unsigned int nr_fields; - const struct lttng_event_field *fields; /* Array of fields. */ + const struct lttng_ust_event_field **fields; /* Array of pointers to fields. */ unsigned int alignment; } struct_nestable; @@ -192,12 +201,26 @@ struct lttng_type { } u; }; -#define LTTNG_UST_ENUM_TYPE_PADDING 24 -struct lttng_enum_desc { +/* + * Enumeration description + * + * IMPORTANT: this structure is part of the ABI between the probe and + * UST. Fields need to be only added at the end, never reordered, never + * removed. + * + * The field @struct_size should be used to determine the size of the + * structure. It should be queried before using additional fields added + * at the end of the structure. + */ + +struct lttng_ust_enum_desc { + uint32_t struct_size; + const char *name; - const struct lttng_enum_entry *entries; + const struct lttng_ust_enum_entry **entries; unsigned int nr_entries; - char padding[LTTNG_UST_ENUM_TYPE_PADDING]; + + /* End of base ABI. Fields below should be used after checking struct_size. */ }; /* @@ -206,19 +229,21 @@ struct lttng_enum_desc { * IMPORTANT: this structure is part of the ABI between the probe and * UST. Fields need to be only added at the end, never reordered, never * removed. + * + * The field @struct_size should be used to determine the size of the + * structure. It should be queried before using additional fields added + * at the end of the structure. */ -#define LTTNG_UST_EVENT_FIELD_PADDING 28 -struct lttng_event_field { +struct lttng_ust_event_field { + uint32_t struct_size; + const char *name; struct lttng_type type; - unsigned int nowrite; /* do not write into trace */ - union { - struct { - unsigned int nofilter:1; /* do not consider for filter */ - } ext; - char padding[LTTNG_UST_EVENT_FIELD_PADDING]; - } u; + unsigned int nowrite:1, /* do not write into trace */ + nofilter:1; /* do not consider for filter */ + + /* End of base ABI. Fields below should be used after checking struct_size. */ }; enum lttng_ust_dynamic_type { @@ -251,7 +276,7 @@ struct lttng_perf_counter_field; #define LTTNG_UST_CTX_FIELD_PADDING 40 struct lttng_ctx_field { - struct lttng_event_field event_field; + struct lttng_ust_event_field event_field; size_t (*get_size)(struct lttng_ctx_field *field, size_t offset); void (*record)(struct lttng_ctx_field *field, struct lttng_ust_lib_ring_buffer_ctx *ctx, @@ -275,35 +300,51 @@ struct lttng_ctx { char padding[LTTNG_UST_CTX_PADDING]; }; -#define LTTNG_UST_EVENT_DESC_PADDING 40 -struct lttng_event_desc { +/* + * IMPORTANT: this structure is part of the ABI between the probe and + * UST. Fields need to be only added at the end, never reordered, never + * removed. + * + * The field @struct_size should be used to determine the size of the + * structure. It should be queried before using additional fields added + * at the end of the structure. + */ +struct lttng_ust_event_desc { + uint32_t struct_size; /* Size of this structure. */ const char *name; void (*probe_callback)(void); const struct lttng_event_ctx *ctx; /* context */ - const struct lttng_event_field *fields; /* event payload */ + const struct lttng_ust_event_field **fields; /* event payload */ unsigned int nr_fields; const int **loglevel; - const char *signature; /* Argument types/names received */ - union { - struct { - const char **model_emf_uri; - void (*event_notifier_callback)(void); - } ext; - char padding[LTTNG_UST_EVENT_DESC_PADDING]; - } u; + const char *signature; /* Argument types/names received */ + const char **model_emf_uri; + + /* End of base ABI. Fields below should be used after checking struct_size. */ }; -#define LTTNG_UST_PROBE_DESC_PADDING 12 -struct lttng_probe_desc { +/* + * IMPORTANT: this structure is part of the ABI between the probe and + * UST. Fields need to be only added at the end, never reordered, never + * removed. + * + * The field @struct_size should be used to determine the size of the + * structure. It should be queried before using additional fields added + * at the end of the structure. + */ +struct lttng_ust_probe_desc { + uint32_t struct_size; /* Size of this structure. */ + const char *provider; - const struct lttng_event_desc **event_desc; + const struct lttng_ust_event_desc **event_desc; unsigned int nr_events; struct cds_list_head head; /* chain registered probes */ struct cds_list_head lazy_init_head; int lazy; /* lazy registration */ uint32_t major; uint32_t minor; - char padding[LTTNG_UST_PROBE_DESC_PADDING]; + + /* End of base ABI. Fields below should be used after checking struct_size. */ }; /* Data structures used by the tracer. */ @@ -321,14 +362,18 @@ struct lttng_interpreter_output; struct lttng_ust_bytecode_runtime_private; /* - * This structure is used in the probes. More specifically, the - * `interpreter_funcs` and `node` fields are explicity used in the - * probes. When modifying this structure we must not change the layout - * of these two fields as it is considered ABI. + * IMPORTANT: this structure is part of the ABI between the probe and + * UST. Fields need to be only added at the end, never reordered, never + * removed. + * + * The field @struct_size should be used to determine the size of the + * structure. It should be queried before using additional fields added + * at the end of the structure. */ -struct lttng_bytecode_runtime { - struct lttng_ust_bytecode_runtime_private *priv; +struct lttng_ust_bytecode_runtime { + uint32_t struct_size; /* Size of this structure. */ + struct lttng_ust_bytecode_runtime_private *priv; /* Associated bytecode */ union { uint64_t (*filter)(void *interpreter_data, @@ -338,6 +383,8 @@ struct lttng_bytecode_runtime { struct lttng_interpreter_output *interpreter_output); } interpreter_funcs; struct cds_list_head node; /* list of bytecode runtime in event */ + + /* End of base ABI. Fields below should be used after checking struct_size. */ }; /* @@ -351,52 +398,96 @@ struct lttng_bytecode_runtime { struct lttng_ust_event_common_private; -struct lttng_event_common { +enum lttng_ust_event_type { + LTTNG_UST_EVENT_TYPE_RECORDER = 0, + LTTNG_UST_EVENT_TYPE_NOTIFIER = 1, +}; + +/* + * IMPORTANT: this structure is part of the ABI between the probe and + * UST. Fields need to be only added at the end, never reordered, never + * removed. + * + * struct lttng_ust_event_common is the common ancestor of the various + * public event actions. Inheritance is done by composition: The parent + * has a pointer to its child, and the child has a pointer to its + * parent. Inheritance of those public structures is done by composition + * to ensure both parent and child structures can be extended. + * + * The field @struct_size should be used to determine the size of the + * structure. It should be queried before using additional fields added + * at the end of the structure. + */ +struct lttng_ust_event_common { uint32_t struct_size; /* Size of this structure. */ struct lttng_ust_event_common_private *priv; /* Private event interface */ + enum lttng_ust_event_type type; + void *child; /* Pointer to child, for inheritance by aggregation. */ + int enabled; int has_enablers_without_bytecode; - /* list of struct lttng_bytecode_runtime, sorted by seqnum */ + /* list of struct lttng_ust_bytecode_runtime, sorted by seqnum */ struct cds_list_head filter_bytecode_runtime_head; + + /* End of base ABI. Fields below should be used after checking struct_size. */ }; struct lttng_ust_event_recorder_private; +/* + * IMPORTANT: this structure is part of the ABI between the probe and + * UST. Fields need to be only added at the end, never reordered, never + * removed. + * + * struct lttng_ust_event_recorder is the action for recording events + * into a ring buffer. It inherits from struct lttng_ust_event_common + * by composition to ensure both parent and child structure are + * extensible. + * + * The field @struct_size should be used to determine the size of the + * structure. It should be queried before using additional fields added + * at the end of the structure. + */ struct lttng_ust_event_recorder { uint32_t struct_size; /* Size of this structure. */ - struct lttng_event_common *parent; + struct lttng_ust_event_common *parent; /* Inheritance by aggregation. */ struct lttng_ust_event_recorder_private *priv; /* Private event record interface */ unsigned int id; struct lttng_channel *chan; struct lttng_ctx *ctx; + + /* End of base ABI. Fields below should be used after checking struct_size. */ }; -struct lttng_event_notifier { - uint64_t user_token; - uint64_t error_counter_index; - int enabled; - int registered; /* has reg'd tracepoint probe */ - size_t num_captures; /* Needed to allocate the msgpack array. */ - void (*notification_send)(struct lttng_event_notifier *event_notifier, +struct lttng_ust_event_notifier_private; + +/* + * IMPORTANT: this structure is part of the ABI between the probe and + * UST. Fields need to be only added at the end, never reordered, never + * removed. + * + * struct lttng_ust_event_notifier is the action for sending + * notifications. It inherits from struct lttng_ust_event_common + * by composition to ensure both parent and child structure are + * extensible. + * + * The field @struct_size should be used to determine the size of the + * structure. It should be queried before using additional fields added + * at the end of the structure. + */ +struct lttng_ust_event_notifier { + uint32_t struct_size; /* Size of this structure. */ + + struct lttng_ust_event_common *parent; /* Inheritance by aggregation. */ + struct lttng_ust_event_notifier_private *priv; /* Private event notifier interface */ + + void (*notification_send)(struct lttng_ust_event_notifier *event_notifier, const char *stack_data); - struct cds_list_head filter_bytecode_runtime_head; struct cds_list_head capture_bytecode_runtime_head; - int has_enablers_without_bytecode; - struct cds_list_head enablers_ref_head; - const struct lttng_event_desc *desc; - struct cds_hlist_node hlist; /* hashtable of event_notifiers */ - struct cds_list_head node; /* event_notifier list in session */ - struct lttng_event_notifier_group *group; /* weak ref */ -}; -struct lttng_enum { - const struct lttng_enum_desc *desc; - struct lttng_session *session; - struct cds_list_head node; /* Enum list in session */ - struct cds_hlist_node hlist; /* Session ht of enums */ - uint64_t id; /* Enumeration ID in sessiond */ + /* End of base ABI. Fields below should be used after checking struct_size. */ }; struct channel; @@ -406,8 +497,14 @@ struct lttng_ust_shm_handle; * IMPORTANT: this structure is part of the ABI between the probe and * UST. Fields need to be only added at the end, never reordered, never * removed. + * + * The field @struct_size should be used to determine the size of the + * structure. It should be queried before using additional fields added + * at the end of the structure. */ -struct lttng_channel_ops { +struct lttng_ust_channel_ops { + uint32_t struct_size; + struct lttng_channel *(*channel_create)(const char *name, void *buf_addr, size_t subbuf_size, size_t num_subbuf, @@ -435,6 +532,8 @@ struct lttng_channel_ops { int (*flush_buffer)(struct channel *chan, struct lttng_ust_shm_handle *handle); void (*event_strcpy)(struct lttng_ust_lib_ring_buffer_ctx *ctx, const char *src, size_t len); + + /* End of base ABI. Fields below should be used after checking struct_size. */ }; /* @@ -456,65 +555,34 @@ struct lttng_channel { struct lttng_session *session; int objd; /* Object associated to channel */ struct cds_list_head node; /* Channel list in session */ - const struct lttng_channel_ops *ops; + const struct lttng_ust_channel_ops *ops; int header_type; /* 0: unset, 1: compact, 2: large */ struct lttng_ust_shm_handle *handle; /* shared-memory handle */ /* Channel ID */ unsigned int id; - enum lttng_ust_chan_type type; + enum lttng_ust_abi_chan_type type; unsigned char uuid[LTTNG_UST_UUID_LEN]; /* Trace session unique ID */ int tstate:1; /* Transient enable state */ }; -struct lttng_counter_dimension; - -struct lttng_counter_ops { - struct lib_counter *(*counter_create)(size_t nr_dimensions, - const struct lttng_counter_dimension *dimensions, - int64_t global_sum_step, - int global_counter_fd, - int nr_counter_cpu_fds, - const int *counter_cpu_fds, - bool is_daemon); - void (*counter_destroy)(struct lib_counter *counter); - int (*counter_add)(struct lib_counter *counter, - const size_t *dimension_indexes, int64_t v); - int (*counter_read)(struct lib_counter *counter, - const size_t *dimension_indexes, int cpu, - int64_t *value, bool *overflow, bool *underflow); - int (*counter_aggregate)(struct lib_counter *counter, - const size_t *dimension_indexes, int64_t *value, - bool *overflow, bool *underflow); - int (*counter_clear)(struct lib_counter *counter, const size_t *dimension_indexes); -}; +/* + * IMPORTANT: this structure is part of the ABI between the probe and + * UST. Fields need to be only added at the end, never reordered, never + * removed. + * + * The field @struct_size should be used to determine the size of the + * structure. It should be queried before using additional fields added + * at the end of the structure. + */ +struct lttng_ust_stack_ctx { + uint32_t struct_size; /* Size of this structure */ -#define LTTNG_UST_STACK_CTX_PADDING 32 -struct lttng_stack_ctx { struct lttng_ust_event_recorder *event_recorder; struct lttng_ctx *chan_ctx; /* RCU dereferenced. */ struct lttng_ctx *event_ctx; /* RCU dereferenced. */ - char padding[LTTNG_UST_STACK_CTX_PADDING]; -}; - -#define LTTNG_UST_EVENT_HT_BITS 12 -#define LTTNG_UST_EVENT_HT_SIZE (1U << LTTNG_UST_EVENT_HT_BITS) -struct lttng_ust_event_ht { - struct cds_hlist_head table[LTTNG_UST_EVENT_HT_SIZE]; -}; - -#define LTTNG_UST_EVENT_NOTIFIER_HT_BITS 12 -#define LTTNG_UST_EVENT_NOTIFIER_HT_SIZE (1U << LTTNG_UST_EVENT_NOTIFIER_HT_BITS) -struct lttng_ust_event_notifier_ht { - struct cds_hlist_head table[LTTNG_UST_EVENT_NOTIFIER_HT_SIZE]; -}; - -#define LTTNG_UST_ENUM_HT_BITS 12 -#define LTTNG_UST_ENUM_HT_SIZE (1U << LTTNG_UST_ENUM_HT_BITS) - -struct lttng_ust_enum_ht { - struct cds_hlist_head table[LTTNG_UST_ENUM_HT_SIZE]; + /* End of base ABI. Fields below should be used after checking struct_size. */ }; struct lttng_ust_session_private; @@ -523,21 +591,30 @@ struct lttng_ust_session_private; * IMPORTANT: this structure is part of the ABI between the probe and * UST. Fields need to be only added at the end, never reordered, never * removed. + * + * The field @struct_size should be used to determine the size of the + * structure. It should be queried before using additional fields added + * at the end of the structure. */ struct lttng_session { uint32_t struct_size; /* Size of this structure */ struct lttng_ust_session_private *priv; /* Private session interface */ int active; /* Is trace session active ? */ + + /* End of base ABI. Fields below should be used after checking struct_size. */ }; -int lttng_probe_register(struct lttng_probe_desc *desc); -void lttng_probe_unregister(struct lttng_probe_desc *desc); +int lttng_ust_probe_register(struct lttng_ust_probe_desc *desc); +void lttng_ust_probe_unregister(struct lttng_ust_probe_desc *desc); /* - * Can be used by applications that change their procname to clear the ust cached value. + * Applications that change their procname and need the new value to be + * reflected in the procname event context have to call this function to clear + * the internally cached value. This should not be called from a signal + * handler. */ -void lttng_context_procname_reset(void); +void lttng_ust_context_procname_reset(void); struct lttng_transport *lttng_transport_find(const char *name);