Implement event notifiers for syscalls

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

diff --git a/include/lttng/events.h b/include/lttng/events.h
index bee47105fa2dfe57f589245dc1c00f24aac8bcbf..61d37d70bdde54073ba5506f6bec36579733cb1e 100644 (file)
--- a/include/lttng/events.h
+++ b/include/lttng/events.h
@@ -299,6 +299,12 @@ enum lttng_syscall_abi {
        LTTNG_SYSCALL_ABI_COMPAT,
 };
 
+struct lttng_syscall {
+       struct list_head node;                  /* chain registered syscall event_notifier */
+       unsigned int syscall_id;
+       bool is_compat;
+};
+
 /*
  * lttng_event structure is referred to by the tracing fast path. It must be
  * kept small.
@@ -351,6 +357,7 @@ struct lttng_event_notifier {
        union {
                struct lttng_kprobe kprobe;
                struct lttng_uprobe uprobe;
+               struct lttng_syscall syscall;
        } u;
 
        /* Backward references: list of lttng_enabler_ref (ref to enablers) */
@@ -629,6 +636,12 @@ struct lttng_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 list_head *event_notifier_syscall_dispatch;
+       struct list_head *event_notifier_compat_syscall_dispatch;
+
+       unsigned int syscall_all:1,
+               sys_enter_registered:1;
 };
 
 struct lttng_metadata_cache {
@@ -770,6 +783,9 @@ int lttng_session_list_tracker_ids(struct lttng_session *session,
 void lttng_clock_ref(void);
 void lttng_clock_unref(void);
 
+int lttng_desc_match_enabler(const struct lttng_event_desc *desc,
+               struct lttng_enabler *enabler);
+
 #if defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
 int lttng_syscalls_register_event(struct lttng_channel *chan, void *filter);
 int lttng_syscalls_unregister_event(struct lttng_channel *chan);
@@ -781,6 +797,14 @@ int lttng_syscall_filter_disable_event(struct lttng_channel *chan,
 long lttng_channel_syscall_mask(struct lttng_channel *channel,
                struct lttng_kernel_syscall_mask __user *usyscall_mask);
 
+int lttng_syscalls_register_event_notifier(
+               struct lttng_event_notifier_enabler *event_notifier_enabler,
+               void *filter);
+int lttng_syscals_create_matching_event_notifiers(
+               struct lttng_event_notifier_enabler *event_notifier_enabler, void *filter);
+int lttng_syscalls_unregister_event_notifier(struct lttng_event_notifier_group *group);
+int lttng_syscall_filter_enable_event_notifier(struct lttng_event_notifier *event_notifier);
+int lttng_syscall_filter_disable_event_notifier(struct lttng_event_notifier *event_notifier);
 #else
 static inline int lttng_syscalls_register_event(
                struct lttng_channel *chan, void *filter)
@@ -816,6 +840,32 @@ static inline long lttng_channel_syscall_mask(struct lttng_channel *channel,
        return -ENOSYS;
 }
 
+static inline int lttng_syscalls_register_event_notifier(
+               struct lttng_event_notifier_group *group, void *filter)
+{
+       return -ENOSYS;
+}
+
+static inline int lttng_syscalls_unregister_event_notifier(
+               struct lttng_event_notifier_group *group)
+{
+       return 0;
+}
+
+static inline int lttng_syscall_filter_enable_event_notifier(
+               struct lttng_event_notifier_group *group,
+               const char *name)
+{
+       return -ENOSYS;
+}
+
+static inline int lttng_syscall_filter_disable_event_notifier(
+               struct lttng_event_notifier_group *group,
+               const char *name)
+{
+       return -ENOSYS;
+}
+
 #endif
 
 void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime);