+ WARN_ON_ONCE(1);
+ return false;
+ }
+}
+
+bool lttng_event_enabler_desc_match_event(struct lttng_event_enabler_common *event_enabler,
+ const struct lttng_kernel_event_desc *desc,
+ struct lttng_kernel_event_common *event)
+{
+ if (event_enabler->event_param.instrumentation != event->priv->instrumentation)
+ return false;
+
+ switch (event_enabler->enabler_type) {
+ case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
+ {
+ struct lttng_event_recorder_enabler *event_recorder_enabler =
+ container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
+ struct lttng_kernel_event_recorder *event_recorder =
+ container_of(event, struct lttng_kernel_event_recorder, parent);
+
+ if (event->priv->desc == desc && event_recorder->chan == event_recorder_enabler->chan)
+ return true;
+ else
+ return false;
+ }
+ case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
+ {
+ struct lttng_event_notifier_enabler *event_notifier_enabler =
+ container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
+ struct lttng_kernel_event_notifier *event_notifier =
+ container_of(event, struct lttng_kernel_event_notifier, parent);
+
+ if (event->priv->desc == desc
+ && event_notifier->priv->group == event_notifier_enabler->group
+ && event->priv->user_token == event_enabler->user_token)
+ return true;
+ else
+ return false;
+ }
+ default:
+ WARN_ON_ONCE(1);
+ return false;
+ }
+}
+
+bool lttng_event_enabler_event_name_match_event(struct lttng_event_enabler_common *event_enabler,
+ const char *event_name,
+ struct lttng_kernel_event_common *event)
+{
+ if (event_enabler->event_param.instrumentation != event->priv->instrumentation)
+ return false;
+
+ switch (event_enabler->enabler_type) {
+ case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
+ {
+ struct lttng_event_recorder_enabler *event_recorder_enabler =
+ container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
+ struct lttng_kernel_event_recorder *event_recorder =
+ container_of(event, struct lttng_kernel_event_recorder, parent);
+
+ if (!strncmp(event->priv->desc->event_name, event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1)
+ && event_recorder->chan == event_recorder_enabler->chan)
+ return true;
+ else
+ return false;
+ }
+ case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
+ {
+ struct lttng_event_notifier_enabler *event_notifier_enabler =
+ container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
+ struct lttng_kernel_event_notifier *event_notifier =
+ container_of(event, struct lttng_kernel_event_notifier, parent);
+
+ if (!strncmp(event->priv->desc->event_name, event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1)
+ && event_notifier->priv->group == event_notifier_enabler->group
+ && event->priv->user_token == event_enabler->user_token)
+ return true;
+ else
+ return false;
+ }
+ default:
+ WARN_ON_ONCE(1);
+ return false;
+ }
+}
+
+static
+struct lttng_enabler_ref *lttng_enabler_ref(
+ struct list_head *enablers_ref_list,
+ struct lttng_event_enabler_common *enabler)
+{
+ struct lttng_enabler_ref *enabler_ref;
+
+ list_for_each_entry(enabler_ref, enablers_ref_list, node) {
+ if (enabler_ref->ref == enabler)
+ return enabler_ref;
+ }
+ return NULL;
+}
+
+static
+void lttng_event_enabler_create_tracepoint_events_if_missing(struct lttng_event_enabler_common *event_enabler)
+{
+ struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(event_enabler);
+ struct lttng_kernel_probe_desc *probe_desc;
+ const struct lttng_kernel_event_desc *desc;
+ struct list_head *probe_list;
+ int i;
+
+ probe_list = lttng_get_probe_list_head();
+ /*
+ * For each probe event, if we find that a probe event matches
+ * our enabler, create an associated lttng_event if not
+ * already present.
+ */
+ list_for_each_entry(probe_desc, probe_list, head) {
+ for (i = 0; i < probe_desc->nr_events; i++) {
+ bool found = false;
+ struct hlist_head *head;
+ struct lttng_kernel_event_common *event;
+ struct lttng_kernel_event_common_private *event_priv;
+
+ desc = probe_desc->event_desc[i];
+ if (!lttng_desc_match_enabler(desc, event_enabler))
+ continue;
+
+ /*
+ * Check if already created.
+ */
+ head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name);
+ lttng_hlist_for_each_entry(event_priv, head, hlist_node) {
+ if (lttng_event_enabler_desc_match_event(event_enabler, desc, event_priv->pub)) {
+ found = true;
+ break;
+ }
+ }
+ if (found)
+ continue;
+
+ /*
+ * We need to create an event for this event probe.
+ */
+ event = _lttng_kernel_event_create(event_enabler, desc);
+ if (IS_ERR(event)) {
+ printk(KERN_INFO "LTTng: Unable to create event %s\n",
+ probe_desc->event_desc[i]->event_name);
+ }
+ }
+ }
+}
+
+/*
+ * Create event if it is missing and present in the list of tracepoint probes.
+ * Should be called with sessions mutex held.
+ */
+static
+void lttng_event_enabler_create_events_if_missing(struct lttng_event_enabler_common *event_enabler)
+{
+ int ret;
+
+ switch (event_enabler->event_param.instrumentation) {
+ case LTTNG_KERNEL_ABI_TRACEPOINT:
+ lttng_event_enabler_create_tracepoint_events_if_missing(event_enabler);
+ break;
+
+ case LTTNG_KERNEL_ABI_SYSCALL:
+ ret = lttng_event_enabler_create_syscall_events_if_missing(event_enabler);
+ WARN_ON_ONCE(ret);
+ break;
+
+ default:
+ WARN_ON_ONCE(1);
+ break;
+ }
+}
+
+static
+void lttng_event_enabler_init_event_filter(struct lttng_event_enabler_common *event_enabler,
+ struct lttng_kernel_event_common *event)
+{
+ /* Link filter bytecodes if not linked yet. */
+ lttng_enabler_link_bytecode(event->priv->desc, lttng_static_ctx,
+ &event->priv->filter_bytecode_runtime_head, &event_enabler->filter_bytecode_head);
+}
+
+static
+void lttng_event_enabler_init_event_capture(struct lttng_event_enabler_common *event_enabler,
+ struct lttng_kernel_event_common *event)
+{
+ switch (event_enabler->enabler_type) {
+ case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
+ break;
+ case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
+ {
+ struct lttng_event_notifier_enabler *event_notifier_enabler =
+ container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
+ struct lttng_kernel_event_notifier *event_notifier =
+ container_of(event, struct lttng_kernel_event_notifier, parent);
+
+ /* Link capture bytecodes if not linked yet. */
+ lttng_enabler_link_bytecode(event->priv->desc,
+ lttng_static_ctx, &event_notifier->priv->capture_bytecode_runtime_head,
+ &event_notifier_enabler->capture_bytecode_head);
+ event_notifier->priv->num_captures = event_notifier_enabler->num_captures;
+ break;