Implement event notifiers for tracepoints

[lttng-modules.git] / include / lttng / events.h

diff --git a/include/lttng/events.h b/include/lttng/events.h
index e32480a98791286c5ad7f46d59f0b646746e8941..5fb7a7804a1807ba8d5f22e960c2b31ccae2d5e0 100644 (file)
--- a/include/lttng/events.h
+++ b/include/lttng/events.h
@@ -10,6 +10,7 @@
 #ifndef _LTTNG_EVENTS_H
 #define _LTTNG_EVENTS_H
 
+#include <linux/irq_work.h>
 #include <linux/version.h>
 #include <linux/list.h>
 #include <linux/kprobes.h>
@@ -169,6 +170,7 @@ struct lttng_perf_counter_field {
 
 struct lttng_probe_ctx {
        struct lttng_event *event;
+       struct lttng_event_notifier *event_notifier; // Not sure if we will ever need it.
        uint8_t interruptible;
 };
 
@@ -211,6 +213,7 @@ struct lttng_event_desc {
        const struct lttng_event_field *fields; /* event payload */
        unsigned int nr_fields;
        struct module *owner;
+       void *event_notifier_callback;
 };
 
 struct lttng_probe_desc {
@@ -348,6 +351,7 @@ struct lttng_event_notifier {
        struct list_head bytecode_runtime_head;
        int has_enablers_without_bytecode;
 
+       void (*send_notification)(struct lttng_event_notifier *event_notifier);
        struct lttng_event_notifier_group *group; /* Weak ref */
 };
 
@@ -604,6 +608,7 @@ struct lttng_session {
 
 struct lttng_event_notifier_group {
        struct file *file;              /* File associated to event notifier group */
+       struct file *notif_file;        /* File used to expose notifications to userspace. */
        struct list_head node;          /* event notifier group list */
        struct list_head enablers_head; /* List of enablers */
        struct list_head event_notifiers_head; /* List of event notifier */
@@ -613,6 +618,8 @@ struct lttng_event_notifier_group {
        struct lttng_transport *transport;
        struct channel *chan;           /* Ring buffer channel for event notifier group. */
        struct lib_ring_buffer *buf;    /* Ring buffer for event notifier group. */
+       wait_queue_head_t read_wait;
+       struct irq_work wakeup_pending; /* Pending wakeup irq work. */
 };
 
 struct lttng_metadata_cache {
@@ -649,7 +656,9 @@ int lttng_event_notifier_enabler_enable(
 int lttng_event_notifier_enabler_disable(
                struct lttng_event_notifier_enabler *event_notifier_enabler);
 int lttng_fix_pending_events(void);
+int lttng_fix_pending_event_notifiers(void);
 int lttng_session_active(void);
+bool lttng_event_notifier_active(void);
 
 struct lttng_session *lttng_session_create(void);
 int lttng_session_enable(struct lttng_session *session);