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 37319ac92cc3288af78bc782a8b4566f793dd038..61d37d70bdde54073ba5506f6bec36579733cb1e 100644 (file)
--- a/include/lttng/events.h
+++ b/include/lttng/events.h
@@ -270,12 +270,25 @@ struct lttng_enabler_ref {
 };
 
 struct lttng_uprobe_handler {
-       struct lttng_event *event;
+       union {
+               struct lttng_event *event;
+               struct lttng_event_notifier *event_notifier;
+       } u;
        loff_t offset;
        struct uprobe_consumer up_consumer;
        struct list_head node;
 };
 
+struct lttng_kprobe {
+       struct kprobe kp;
+       char *symbol_name;
+};
+
+struct lttng_uprobe {
+       struct inode *inode;
+       struct list_head head;
+};
+
 enum lttng_syscall_entryexit {
        LTTNG_SYSCALL_ENTRY,
        LTTNG_SYSCALL_EXIT,
@@ -286,6 +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.
@@ -300,18 +319,12 @@ struct lttng_event {
        struct lttng_ctx *ctx;
        enum lttng_kernel_instrumentation instrumentation;
        union {
-               struct {
-                       struct kprobe kp;
-                       char *symbol_name;
-               } kprobe;
+               struct lttng_kprobe kprobe;
                struct {
                        struct lttng_krp *lttng_krp;
                        char *symbol_name;
                } kretprobe;
-               struct {
-                       struct inode *inode;
-                       struct list_head head;
-               } uprobe;
+               struct lttng_uprobe uprobe;
                struct {
                        char *syscall_name;
                        enum lttng_syscall_entryexit entryexit;
@@ -342,6 +355,9 @@ 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) */
@@ -620,6 +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 {
@@ -656,7 +678,9 @@ 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);
@@ -719,6 +743,9 @@ int lttng_channel_disable(struct lttng_channel *channel);
 int lttng_event_enable(struct lttng_event *event);
 int lttng_event_disable(struct lttng_event *event);
 
+int lttng_event_notifier_enable(struct lttng_event_notifier *event_notifier);
+int lttng_event_notifier_disable(struct lttng_event_notifier *event_notifier);
+
 void lttng_transport_register(struct lttng_transport *transport);
 void lttng_transport_unregister(struct lttng_transport *transport);
 
@@ -756,23 +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;
 }
@@ -782,13 +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;
@@ -800,6 +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);
@@ -1005,16 +1071,22 @@ void lttng_logger_exit(void);
 extern int lttng_statedump_start(struct lttng_session *session);
 
 #ifdef CONFIG_KPROBES
-int lttng_kprobes_register(const char *name,
+int lttng_kprobes_register_event(const char *name,
                const char *symbol_name,
                uint64_t offset,
                uint64_t addr,
                struct lttng_event *event);
-void lttng_kprobes_unregister(struct lttng_event *event);
-void lttng_kprobes_destroy_private(struct lttng_event *event);
+void lttng_kprobes_unregister_event(struct lttng_event *event);
+void lttng_kprobes_destroy_event_private(struct lttng_event *event);
+int lttng_kprobes_register_event_notifier(const char *symbol_name,
+               uint64_t offset,
+               uint64_t addr,
+               struct lttng_event_notifier *event_notifier);
+void lttng_kprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier);
+void lttng_kprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier);
 #else
 static inline
-int lttng_kprobes_register(const char *name,
+int lttng_kprobes_register_event(const char *name,
                const char *symbol_name,
                uint64_t offset,
                uint64_t addr,
@@ -1024,12 +1096,31 @@ int lttng_kprobes_register(const char *name,
 }
 
 static inline
-void lttng_kprobes_unregister(struct lttng_event *event)
+void lttng_kprobes_unregister_event(struct lttng_event *event)
 {
 }
 
 static inline
-void lttng_kprobes_destroy_private(struct lttng_event *event)
+void lttng_kprobes_destroy_event_private(struct lttng_event *event)
+{
+}
+
+static inline
+int lttng_kprobes_register_event_notifier(const char *symbol_name,
+               uint64_t offset,
+               uint64_t addr,
+               struct lttng_event_notifier *event_notifier)
+{
+       return -ENOSYS;
+}
+
+static inline
+void lttng_kprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier)
+{
+}
+
+static inline
+void lttng_kprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier)
 {
 }
 #endif
@@ -1037,35 +1128,68 @@ void lttng_kprobes_destroy_private(struct lttng_event *event)
 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(const char *name,
+int lttng_uprobes_register_event(const char *name,
        int fd, struct lttng_event *event);
-int lttng_uprobes_add_callsite(struct lttng_event *event,
+int lttng_uprobes_event_add_callsite(struct lttng_event *event,
        struct lttng_kernel_event_callsite *callsite);
-void lttng_uprobes_unregister(struct lttng_event *event);
-void lttng_uprobes_destroy_private(struct lttng_event *event);
+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(const char *name,
+int lttng_uprobes_register_event(const char *name,
        int fd, struct lttng_event *event)
 {
        return -ENOSYS;
 }
 
 static inline
-int lttng_uprobes_add_callsite(struct lttng_event *event,
+int lttng_uprobes_event_add_callsite(struct lttng_event *event,
+       struct lttng_kernel_event_callsite *callsite)
+{
+       return -ENOSYS;
+}
+
+static inline
+void lttng_uprobes_unregister_event(struct lttng_event *event)
+{
+}
+
+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(struct lttng_event *event)
+void lttng_uprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier)
 {
 }
 
 static inline
-void lttng_uprobes_destroy_private(struct lttng_event *event)
+void lttng_uprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier)
 {
 }
 #endif