src/bin/lttng-sessiond/trace-kernel.h

   1 /*
   2  * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
   3  *
   4  * SPDX-License-Identifier: GPL-2.0-only
   5  *
   6  */
   7
   8 #ifndef _LTT_TRACE_KERNEL_H
   9 #define _LTT_TRACE_KERNEL_H
  10
  11 #include <urcu/list.h>
  12
  13 #include <lttng/lttng.h>
  14 #include <common/lttng-kernel.h>
  15 #include <common/lttng-kernel-old.h>
  16 #include <common/defaults.h>
  17
  18 #include "consumer.h"
  19 #include "tracker.h"
  20
  21 /* Kernel event list */
  22 struct ltt_kernel_event_list {
  23         struct cds_list_head head;
  24 };
  25
  26 /* Channel stream list */
  27 struct ltt_kernel_stream_list {
  28         struct cds_list_head head;
  29 };
  30
  31 /* Channel list */
  32 struct ltt_kernel_channel_list {
  33         struct cds_list_head head;
  34 };
  35
  36 struct ltt_kernel_context {
  37         struct lttng_kernel_context ctx;
  38         struct cds_list_head list;
  39         /* Indicates whether or not the context is in a list. */
  40         bool in_list;
  41 };
  42
  43 /* Kernel event */
  44 struct ltt_kernel_event {
  45         int fd;
  46         int enabled;
  47         enum lttng_event_type type;
  48         struct lttng_kernel_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;
  53 };
  54
  55 /* Kernel event */
  56 struct ltt_kernel_event_notifier_rule {
  57         int fd;
  58         uint64_t error_counter_index;
  59         int enabled;
  60         enum lttng_event_type type;
  61         struct lttng_trigger *trigger;
  62         uint64_t token;
  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;
  68 };
  69
  70 /* Kernel channel */
  71 struct ltt_kernel_channel {
  72         int fd;
  73         uint64_t key; /* Key to reference this channel with the consumer. */
  74         int enabled;
  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;
  86 };
  87
  88 /* Metadata */
  89 struct ltt_kernel_metadata {
  90         int fd;
  91         uint64_t key; /* Key to reference this channel with the consumer. */
  92         struct lttng_channel *conf;
  93 };
  94
  95 /* Channel stream */
  96 struct ltt_kernel_stream {
  97         int fd;
  98         int state;
  99         int cpu;
 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;
 106 };
 107
 108 /* Kernel session */
 109 struct ltt_kernel_session {
 110         int fd;
 111         int metadata_stream_fd;
 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 */
 118         uid_t uid;
 119         gid_t gid;
 120         struct consumer_output *consumer;
 121         /* Tracing session id */
 122         uint64_t 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;
 130         /* Current trace chunk of the ltt_session. */
 131         struct lttng_trace_chunk *current_trace_chunk;
 132         /* Tracker lists */
 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;
 139 };
 140
 141 /*
 142  * Lookup functions. NULL is returned if not found.
 143  */
 144 struct ltt_kernel_event *trace_kernel_get_event_by_name(
 145                 char *name, struct ltt_kernel_channel *channel,
 146                 enum lttng_event_type type);
 147 struct ltt_kernel_event *trace_kernel_find_event(
 148                 char *name, struct ltt_kernel_channel *channel,
 149                 enum lttng_event_type type,
 150                 struct lttng_bytecode *filter);
 151 struct ltt_kernel_channel *trace_kernel_get_channel_by_name(
 152                 const char *name, struct ltt_kernel_session *session);
 153
 154 /*
 155  * Create functions malloc() the data structure.
 156  */
 157 struct ltt_kernel_session *trace_kernel_create_session(void);
 158 struct ltt_kernel_channel *trace_kernel_create_channel(
 159                 struct lttng_channel *chan);
 160 enum lttng_error_code trace_kernel_create_event(struct lttng_event *ev,
 161                 char *filter_expression, struct lttng_bytecode *filter,
 162                 struct ltt_kernel_event **kernel_event);
 163 struct ltt_kernel_metadata *trace_kernel_create_metadata(void);
 164 struct ltt_kernel_stream *trace_kernel_create_stream(const char *name,
 165                 unsigned int count);
 166 struct ltt_kernel_context *trace_kernel_create_context(
 167                 struct lttng_kernel_context *ctx);
 168 /* Trigger is only non-const to acquire a reference. */
 169 enum lttng_error_code trace_kernel_create_event_notifier_rule(
 170                 struct lttng_trigger *trigger,
 171                 uint64_t token,
 172                 uint64_t error_counter_index,
 173                 struct ltt_kernel_event_notifier_rule **event_notifier_rule);
 174 struct ltt_kernel_context *trace_kernel_copy_context(
 175                 struct ltt_kernel_context *ctx);
 176 enum lttng_error_code trace_kernel_init_event_notifier_from_event_rule(
 177                 const struct lttng_event_rule *rule,
 178                 struct lttng_kernel_event_notifier *kernel_event_notifier);
 179
 180 /*
 181  * Destroy functions free() the data structure and remove from linked list if
 182  * it's applies.
 183  */
 184 void trace_kernel_destroy_session(struct ltt_kernel_session *session);
 185 void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata);
 186 void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel);
 187 void trace_kernel_destroy_event(struct ltt_kernel_event *event);
 188 void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream);
 189 void trace_kernel_destroy_context(struct ltt_kernel_context *ctx);
 190 void trace_kernel_destroy_event_notifier_rule(struct ltt_kernel_event_notifier_rule *rule);
 191 void trace_kernel_free_session(struct ltt_kernel_session *session);
 192
 193 #endif /* _LTT_TRACE_KERNEL_H */