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 ff0a48ff1f6b766054edf2b1209fe03b4271a70a..61d37d70bdde54073ba5506f6bec36579733cb1e 100644 (file)
--- a/include/lttng/events.h
+++ b/include/lttng/events.h
@@ -272,6 +272,7 @@ struct lttng_enabler_ref {
 struct lttng_uprobe_handler {
        union {
                struct lttng_event *event;
+               struct lttng_event_notifier *event_notifier;
        } u;
        loff_t offset;
        struct uprobe_consumer up_consumer;
@@ -298,6 +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.
@@ -349,6 +356,8 @@ struct lttng_event_notifier {
        enum lttng_kernel_instrumentation instrumentation;
        union {
                struct lttng_kprobe kprobe;
+               struct lttng_uprobe uprobe;
+               struct lttng_syscall syscall;
        } u;
 
        /* Backward references: list of lttng_enabler_ref (ref to enablers) */
@@ -627,6 +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 {
@@ -768,23 +783,36 @@ 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(struct lttng_channel *chan, void *filter);
-int lttng_syscalls_unregister(struct lttng_channel *chan);
-int lttng_syscalls_destroy(struct lttng_channel *chan);
-int lttng_syscall_filter_enable(struct lttng_channel *chan,
+int lttng_syscalls_register_event(struct lttng_channel *chan, void *filter);
+int lttng_syscalls_unregister_event(struct lttng_channel *chan);
+int lttng_syscalls_destroy_event(struct lttng_channel *chan);
+int lttng_syscall_filter_enable_event(struct lttng_channel *chan,
                struct lttng_event *event);
-int lttng_syscall_filter_disable(struct lttng_channel *chan,
+int lttng_syscall_filter_disable_event(struct lttng_channel *chan,
                struct lttng_event *event);
 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(struct lttng_channel *chan, void *filter)
+static inline int lttng_syscalls_register_event(
+               struct lttng_channel *chan, void *filter)
 {
        return -ENOSYS;
 }
 
-static inline int lttng_syscalls_unregister(struct lttng_channel *chan)
+static inline int lttng_syscalls_unregister_event(struct lttng_channel *chan)
 {
        return 0;
 }
@@ -794,13 +822,13 @@ static inline int lttng_syscalls_destroy(struct lttng_channel *chan)
        return 0;
 }
 
-static inline int lttng_syscall_filter_enable(struct lttng_channel *chan,
+static inline int lttng_syscall_filter_enable_event(struct lttng_channel *chan,
                struct lttng_event *event);
 {
        return -ENOSYS;
 }
 
-static inline int lttng_syscall_filter_disable(struct lttng_channel *chan,
+static inline int lttng_syscall_filter_disable_event(struct lttng_channel *chan,
                struct lttng_event *event);
 {
        return -ENOSYS;
@@ -812,6 +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);
@@ -1074,6 +1128,9 @@ void lttng_kprobes_destroy_event_notifier_private(struct lttng_event_notifier *e
 int lttng_event_add_callsite(struct lttng_event *event,
        struct lttng_kernel_event_callsite *callsite);
 
+int lttng_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier,
+       struct lttng_kernel_event_callsite *callsite);
+
 #ifdef CONFIG_UPROBES
 int lttng_uprobes_register_event(const char *name,
        int fd, struct lttng_event *event);
@@ -1081,6 +1138,12 @@ int lttng_uprobes_event_add_callsite(struct lttng_event *event,
        struct lttng_kernel_event_callsite *callsite);
 void lttng_uprobes_unregister_event(struct lttng_event *event);
 void lttng_uprobes_destroy_event_private(struct lttng_event *event);
+int lttng_uprobes_register_event_notifier(const char *name,
+       int fd, struct lttng_event_notifier *event_notifier);
+int lttng_uprobes_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier,
+       struct lttng_kernel_event_callsite *callsite);
+void lttng_uprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier);
+void lttng_uprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier);
 #else
 static inline
 int lttng_uprobes_register_event(const char *name,
@@ -1105,6 +1168,30 @@ static inline
 void lttng_uprobes_destroy_event_private(struct lttng_event *event)
 {
 }
+
+static inline
+int lttng_uprobes_register_event_notifier(const char *name,
+       int fd, struct lttng_event_notifier *event_notifier)
+{
+       return -ENOSYS;
+}
+
+static inline
+int lttng_uprobes_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier,
+       struct lttng_kernel_event_callsite *callsite)
+{
+       return -ENOSYS;
+}
+
+static inline
+void lttng_uprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier)
+{
+}
+
+static inline
+void lttng_uprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier)
+{
+}
 #endif
 
 #ifdef CONFIG_KRETPROBES