return 0;
}
+static
+int lttng_kprobes_event_notifier_handler_pre(struct kprobe *p, struct pt_regs *regs)
+{
+ struct lttng_event_notifier *event_notifier =
+ container_of(p, struct lttng_event_notifier, u.kprobe.kp);
+
+ if (unlikely(!READ_ONCE(event_notifier->enabled)))
+ return 0;
+
+ event_notifier->send_notification(event_notifier);
+
+ return 0;
+}
+
/*
* Create event description
*/
return ret;
}
+/*
+ * Create event_notifier description
+ */
+static
+int lttng_create_kprobe_event_notifier(const char *name, struct lttng_event_notifier *event_notifier)
+{
+ struct lttng_event_desc *desc;
+ int ret;
+
+ desc = kzalloc(sizeof(*event_notifier->desc), GFP_KERNEL);
+ if (!desc)
+ return -ENOMEM;
+ desc->name = kstrdup(name, GFP_KERNEL);
+ if (!desc->name) {
+ ret = -ENOMEM;
+ goto error_str;
+ }
+ desc->nr_fields = 0;
+
+ desc->owner = THIS_MODULE;
+ event_notifier->desc = desc;
+
+ return 0;
+
+error_str:
+ kfree(desc);
+ return ret;
+}
+
static
int _lttng_kprobes_register(const char *symbol_name,
uint64_t offset,
lttng_kp->kp.addr = (void *) (unsigned long) addr;
/*
- * Ensure the memory we just allocated don't trigger page faults.
+ * Ensure the memory we just allocated don't event_notifier page faults.
* Well.. kprobes itself puts the page fault handler on the blacklist,
* but we can never be too careful.
*/
}
EXPORT_SYMBOL_GPL(lttng_kprobes_register_event);
+int lttng_kprobes_register_event_notifier(const char *symbol_name,
+ uint64_t offset,
+ uint64_t addr,
+ struct lttng_event_notifier *event_notifier)
+{
+ int ret;
+ ret = lttng_create_kprobe_event_notifier(symbol_name, event_notifier);
+ if (ret)
+ goto error;
+
+ ret = _lttng_kprobes_register(symbol_name, offset, addr,
+ &event_notifier->u.kprobe, lttng_kprobes_event_notifier_handler_pre);
+ if (ret)
+ goto register_error;
+
+ return 0;
+
+register_error:
+ kfree(event_notifier->desc->name);
+ kfree(event_notifier->desc);
+error:
+ return ret;
+}
+EXPORT_SYMBOL_GPL(lttng_kprobes_register_event_notifier);
+
void lttng_kprobes_unregister_event(struct lttng_event *event)
{
unregister_kprobe(&event->u.kprobe.kp);
}
EXPORT_SYMBOL_GPL(lttng_kprobes_unregister_event);
+void lttng_kprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier)
+{
+ unregister_kprobe(&event_notifier->u.kprobe.kp);
+}
+EXPORT_SYMBOL_GPL(lttng_kprobes_unregister_event_notifier);
+
void lttng_kprobes_destroy_event_private(struct lttng_event *event)
{
kfree(event->u.kprobe.symbol_name);
}
EXPORT_SYMBOL_GPL(lttng_kprobes_destroy_event_private);
+void lttng_kprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier)
+{
+ kfree(event_notifier->u.kprobe.symbol_name);
+ kfree(event_notifier->desc->name);
+ kfree(event_notifier->desc);
+}
+EXPORT_SYMBOL_GPL(lttng_kprobes_destroy_event_notifier_private);
+
MODULE_LICENSE("GPL and additional rights");
MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
MODULE_DESCRIPTION("LTTng kprobes probes");