Add CPU hotplug notifier for ltt debugfs ABI, add pollwait exclusive wrapper

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

diff --git a/ltt-events.h b/ltt-events.h
index 5fd0b67a0c5137cbbd0e68ad67fd1c3254e61302..9c6fcac31a7a9207ad718be60a733c365755111c 100644 (file)
--- a/ltt-events.h
+++ b/ltt-events.h
@@ -7,6 +7,8 @@
  * Copyright 2010 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  *
  * Holds LTTng per-session event registry.
+ *
+ * Dual LGPL v2.1/GPL v2 license.
  */
 
 #include <linux/list.h>
@@ -14,6 +16,9 @@
 #include <linux/kprobes.h>
 #include "ltt-debugfs-abi.h"
 
+#undef is_signed_type
+#define is_signed_type(type)           (((type)(-1)) < 0)
+
 struct ltt_channel;
 struct ltt_session;
 struct lib_ring_buffer_ctx;
@@ -45,7 +50,7 @@ struct lttng_enum_entry {
        const char *string;
 };
 
-#define __type_integer(_type, _byte_order, _base)              \
+#define __type_integer(_type, _byte_order, _base, _encoding)   \
        {                                                       \
            .atype = atype_integer,                             \
            .u.basic.integer =                                  \
@@ -55,7 +60,7 @@ struct lttng_enum_entry {
                  .signedness = is_signed_type(_type),          \
                  .reverse_byte_order = _byte_order != __BYTE_ORDER,    \
                  .base = _base,                                \
-                 .encoding = lttng_encode_none,                \
+                 .encoding = lttng_encode_##_encoding,         \
                },                                              \
        }                                                       \
 
@@ -115,16 +120,20 @@ struct lttng_event_field {
 };
 
 struct lttng_ctx_field {
-       const char *name;
-       struct lttng_type type;
-       void *callback;
+       struct lttng_event_field event_field;
+       size_t (*get_size)(size_t offset);
+       void (*record)(struct lttng_ctx_field *field,
+                      struct lib_ring_buffer_ctx *ctx,
+                      struct ltt_channel *chan);
        union {
                struct {
                        struct perf_event **e;  /* per-cpu array */
-                       struct list_head head;
+                       struct notifier_block nb;
+                       int hp_enable;
                        struct perf_event_attr *attr;
                } perf_counter;
        } u;
+       void (*destroy)(struct lttng_ctx_field *field);
 };
 
 struct lttng_ctx {
@@ -139,6 +148,7 @@ struct lttng_event_desc {
        const struct lttng_event_ctx *ctx;      /* context */
        const struct lttng_event_field *fields; /* event payload */
        unsigned int nr_fields;
+       struct module *owner;
 };
 
 struct lttng_probe_desc {
@@ -156,6 +166,7 @@ struct ltt_event {
        struct ltt_channel *chan;
        const struct lttng_event_desc *desc;
        void *filter;
+       struct lttng_ctx *ctx;
        enum lttng_kernel_instrumentation instrumentation;
        union {
                struct {
@@ -180,7 +191,8 @@ struct ltt_channel_ops {
        void (*channel_destroy)(struct channel *chan);
        struct lib_ring_buffer *(*buffer_read_open)(struct channel *chan);
        void (*buffer_read_close)(struct lib_ring_buffer *buf);
-       int (*event_reserve)(struct lib_ring_buffer_ctx *ctx);
+       int (*event_reserve)(struct lib_ring_buffer_ctx *ctx,
+                            uint32_t event_id);
        void (*event_commit)(struct lib_ring_buffer_ctx *ctx);
        void (*event_write)(struct lib_ring_buffer_ctx *ctx, const void *src,
                            size_t len);
@@ -190,18 +202,20 @@ struct ltt_channel_ops {
         * may change due to concurrent writes.
         */
        size_t (*packet_avail_size)(struct channel *chan);
-       wait_queue_head_t *(*get_reader_wait_queue)(struct ltt_channel *chan);
+       wait_queue_head_t *(*get_reader_wait_queue)(struct channel *chan);
+       wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
+       int (*is_finalized)(struct channel *chan);
 };
 
 struct ltt_channel {
        unsigned int id;
        struct channel *chan;           /* Channel buffers */
+       struct lttng_ctx *ctx;
        /* Event ID management */
        struct ltt_session *session;
        struct file *file;              /* File associated to channel */
        unsigned int free_event_id;     /* Next event ID to allocate */
        struct list_head list;          /* Channel list */
-       wait_queue_head_t notify_wait;  /* Channel addition notif. waitqueue */
        struct ltt_channel_ops *ops;
        int header_type;                /* 0: unset, 1: compact, 2: large */
        int metadata_dumped:1;
@@ -209,6 +223,7 @@ struct ltt_channel {
 
 struct ltt_session {
        int active;                     /* Is trace session active ? */
+       int been_active;                /* Has trace session been active ? */
        struct file *file;              /* File associated to session */
        struct ltt_channel *metadata;   /* Metadata channel */
        struct list_head chan;          /* Channel list head */
@@ -259,6 +274,18 @@ const struct lttng_event_desc *ltt_event_get(const char *name);
 void ltt_event_put(const struct lttng_event_desc *desc);
 int ltt_probes_init(void);
 void ltt_probes_exit(void);
+struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx);
+void lttng_remove_context_field(struct lttng_ctx **ctx,
+                               struct lttng_ctx_field *field);
+void lttng_destroy_context(struct lttng_ctx *ctx);
+int lttng_add_pid_to_ctx(struct lttng_ctx **ctx);
+int lttng_add_comm_to_ctx(struct lttng_ctx **ctx);
+int lttng_add_prio_to_ctx(struct lttng_ctx **ctx);
+int lttng_add_nice_to_ctx(struct lttng_ctx **ctx);
+int lttng_add_perf_counter_to_ctx(uint32_t type,
+                                 uint64_t config,
+                                 const char *name,
+                                 struct lttng_ctx **ctx);
 
 #ifdef CONFIG_KPROBES
 int lttng_kprobes_register(const char *name,
@@ -267,6 +294,7 @@ int lttng_kprobes_register(const char *name,
                uint64_t addr,
                struct ltt_event *event);
 void lttng_kprobes_unregister(struct ltt_event *event);
+void lttng_kprobes_destroy_private(struct ltt_event *event);
 #else
 static inline
 int lttng_kprobes_register(const char *name,
@@ -282,6 +310,11 @@ static inline
 void lttng_kprobes_unregister(struct ltt_event *event)
 {
 }
+
+static inline
+void lttng_kprobes_destroy_private(struct ltt_event *event)
+{
+}
 #endif
 
 #ifdef CONFIG_DYNAMIC_FTRACE
@@ -289,6 +322,7 @@ int lttng_ftrace_register(const char *name,
                          const char *symbol_name,
                          struct ltt_event *event);
 void lttng_ftrace_unregister(struct ltt_event *event);
+void lttng_ftrace_destroy_private(struct ltt_event *event);
 #else
 static inline
 int lttng_ftrace_register(const char *name,
@@ -302,5 +336,13 @@ static inline
 void lttng_ftrace_unregister(struct ltt_event *event)
 {
 }
+
+static inline
+void lttng_ftrace_destroy_private(struct ltt_event *event)
+{
+}
 #endif
+
+extern const struct file_operations lttng_tracepoint_list_fops;
+
 #endif /* _LTT_EVENTS_H */