2 * Copyright (C) 2011 EfficiOS Inc.
4 * SPDX-License-Identifier: GPL-2.0-only
8 #ifndef _LTT_TRACE_KERNEL_H
9 #define _LTT_TRACE_KERNEL_H
11 #include <urcu/list.h>
13 #include <lttng/lttng.h>
14 #include <common/lttng-kernel.hpp>
15 #include <common/lttng-kernel-old.hpp>
16 #include <common/defaults.hpp>
18 #include "consumer.hpp"
19 #include "tracker.hpp"
21 /* Kernel event list */
22 struct ltt_kernel_event_list {
23 struct cds_list_head head;
26 /* Channel stream list */
27 struct ltt_kernel_stream_list {
28 struct cds_list_head head;
32 struct ltt_kernel_channel_list {
33 struct cds_list_head head;
36 struct ltt_kernel_context {
37 struct lttng_kernel_abi_context ctx;
38 struct cds_list_head list;
39 /* Indicates whether or not the context is in a list. */
44 struct ltt_kernel_event {
47 enum lttng_event_type type;
48 struct lttng_kernel_abi_event *event;
49 struct cds_list_head list;
50 char *filter_expression;
51 struct lttng_bytecode *filter;
52 struct lttng_userspace_probe_location *userspace_probe_location;
56 struct ltt_kernel_event_notifier_rule {
58 uint64_t error_counter_index;
60 enum lttng_event_type type;
61 struct lttng_trigger *trigger;
63 const struct lttng_bytecode *filter;
64 struct lttng_userspace_probe_location *userspace_probe_location;
65 struct cds_lfht_node ht_node;
66 /* call_rcu delayed reclaim. */
67 struct rcu_head rcu_node;
71 struct ltt_kernel_channel {
73 uint64_t key; /* Key to reference this channel with the consumer. */
75 unsigned int stream_count;
76 unsigned int event_count;
77 bool published_to_notification_thread;
78 struct cds_list_head ctx_list;
79 struct lttng_channel *channel;
80 struct ltt_kernel_event_list events_list;
81 struct ltt_kernel_stream_list stream_list;
82 struct cds_list_head list;
83 /* Session pointer which has a reference to this object. */
84 struct ltt_kernel_session *session;
85 bool sent_to_consumer;
89 struct ltt_kernel_metadata {
91 uint64_t key; /* Key to reference this channel with the consumer. */
92 struct lttng_channel *conf;
96 struct ltt_kernel_stream {
100 bool sent_to_consumer;
101 /* Format is %s_%d respectively channel name and CPU number. */
102 char name[DEFAULT_STREAM_NAME_LEN];
103 uint64_t tracefile_size;
104 uint64_t tracefile_count;
105 struct cds_list_head list;
109 struct ltt_kernel_session {
111 int metadata_stream_fd{-1};
112 int consumer_fds_sent{};
113 unsigned int channel_count{};
114 unsigned int stream_count_global{};
115 struct ltt_kernel_metadata *metadata{};
116 struct ltt_kernel_channel_list channel_list {};
117 /* UID/GID of the user owning the session */
120 struct consumer_output *consumer{};
121 /* Tracing session id */
123 /* Session is active or not meaning it has been started or stopped. */
124 unsigned int active:1;
125 /* Tell or not if the session has to output the traces. */
126 unsigned int output_traces{};
127 unsigned int snapshot_mode{};
128 unsigned int has_non_default_channel{};
129 bool is_live_session{false};
130 /* Current trace chunk of the ltt_session. */
131 struct lttng_trace_chunk *current_trace_chunk{};
133 struct process_attr_tracker *tracker_pid{};
134 struct process_attr_tracker *tracker_vpid{};
135 struct process_attr_tracker *tracker_uid{};
136 struct process_attr_tracker *tracker_vuid{};
137 struct process_attr_tracker *tracker_gid{};
138 struct process_attr_tracker *tracker_vgid{};
140 lttng::trace_format_descriptor::csptr trace_format;
144 * Lookup functions. NULL is returned if not found.
146 struct ltt_kernel_event *trace_kernel_get_event_by_name(
147 char *name, struct ltt_kernel_channel *channel,
148 enum lttng_event_type type);
149 struct ltt_kernel_event *trace_kernel_find_event(
150 char *name, struct ltt_kernel_channel *channel,
151 enum lttng_event_type type,
152 struct lttng_bytecode *filter);
153 struct ltt_kernel_channel *trace_kernel_get_channel_by_name(
154 const char *name, struct ltt_kernel_session *session);
157 * Create functions malloc() the data structure.
159 struct ltt_kernel_session *trace_kernel_create_session(
160 lttng::trace_format_descriptor::csptr trace_format);
161 struct ltt_kernel_channel *trace_kernel_create_channel(
162 struct lttng_channel *chan);
163 enum lttng_error_code trace_kernel_create_event(struct lttng_event *ev,
164 char *filter_expression, struct lttng_bytecode *filter,
165 struct ltt_kernel_event **kernel_event);
166 struct ltt_kernel_metadata *trace_kernel_create_metadata(void);
167 struct ltt_kernel_stream *trace_kernel_create_stream(const char *name,
169 struct ltt_kernel_context *trace_kernel_create_context(
170 struct lttng_kernel_abi_context *ctx);
171 /* Trigger is only non-const to acquire a reference. */
172 enum lttng_error_code trace_kernel_create_event_notifier_rule(
173 struct lttng_trigger *trigger,
175 uint64_t error_counter_index,
176 struct ltt_kernel_event_notifier_rule **event_notifier_rule);
177 struct ltt_kernel_context *trace_kernel_copy_context(
178 struct ltt_kernel_context *ctx);
179 enum lttng_error_code trace_kernel_init_event_notifier_from_event_rule(
180 const struct lttng_event_rule *rule,
181 struct lttng_kernel_abi_event_notifier *kernel_event_notifier);
184 * Destroy functions free() the data structure and remove from linked list if
187 void trace_kernel_destroy_session(struct ltt_kernel_session *session);
188 void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata);
189 void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel);
190 void trace_kernel_destroy_event(struct ltt_kernel_event *event);
191 void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream);
192 void trace_kernel_destroy_context(struct ltt_kernel_context *ctx);
193 void trace_kernel_destroy_event_notifier_rule(struct ltt_kernel_event_notifier_rule *rule);
194 void trace_kernel_free_session(struct ltt_kernel_session *session);
196 #endif /* _LTT_TRACE_KERNEL_H */