X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=ltt-events.h;h=6cc3753101fb1606de8f1c11fe1f81c504c7553b;hb=64c796d8aec1efa5d6f0d5850d2a0095cb7842e3;hp=165e616ac8306f20992f4e494da045441bfb97a4;hpb=baf2099544522f85e52c830b13aa45601ff15204;p=lttng-modules.git

diff --git a/ltt-events.h b/ltt-events.h
index 165e616a..6cc37531 100644
--- a/ltt-events.h
+++ b/ltt-events.h
@@ -1,3 +1,6 @@
+#ifndef _LTT_EVENTS_H
+#define _LTT_EVENTS_H
+
 /*
  * ltt-events.h
  *
@@ -7,12 +10,141 @@
  */
 
 #include <linux/list.h>
+#include <linux/uuid.h>
+#include <linux/kprobes.h>
+#include "ltt-debugfs-abi.h"
 
 struct ltt_channel;
 struct ltt_session;
+struct lib_ring_buffer_ctx;
+struct perf_event;
+struct perf_event_attr;
+
+/* Type description */
+
+/* Update the astract_types name table in lttng-types.c along with this enum */
+enum abstract_types {
+	atype_integer,
+	atype_enum,
+	atype_array,
+	atype_sequence,
+	atype_string,
+	NR_ABSTRACT_TYPES,
+};
+
+/* Update the string_encodings name table in lttng-types.c along with this enum */
+enum lttng_string_encodings {
+	lttng_encode_none = 0,
+	lttng_encode_UTF8 = 1,
+	lttng_encode_ASCII = 2,
+	NR_STRING_ENCODINGS,
+};
 
-enum instrum_type itype {
-	INSTRUM_TRACEPOINTS,
+struct lttng_enum_entry {
+	unsigned long long start, end;	/* start and end are inclusive */
+	const char *string;
+};
+
+#define __type_integer(_type, _byte_order, _base, _encoding)	\
+	{							\
+	    .atype = atype_integer,				\
+	    .u.basic.integer =					\
+		{						\
+		  .size = sizeof(_type) * CHAR_BIT,		\
+		  .alignment = ltt_alignof(_type) * CHAR_BIT,	\
+		  .signedness = is_signed_type(_type),		\
+		  .reverse_byte_order = _byte_order != __BYTE_ORDER,	\
+		  .base = _base,				\
+		  .encoding = lttng_encode_##_encoding,		\
+		},						\
+	}							\
+
+struct lttng_integer_type {
+	unsigned int size;		/* in bits */
+	unsigned short alignment;	/* in bits */
+	unsigned int signedness:1;
+	unsigned int reverse_byte_order:1;
+	unsigned int base;		/* 2, 8, 10, 16, for pretty print */
+	enum lttng_string_encodings encoding;
+};
+
+union _lttng_basic_type {
+	struct lttng_integer_type integer;
+	struct {
+		const char *name;
+	} enumeration;
+	struct {
+		enum lttng_string_encodings encoding;
+	} string;
+};
+
+struct lttng_basic_type {
+	enum abstract_types atype;
+	union {
+		union _lttng_basic_type basic;
+	} u;
+};
+
+struct lttng_type {
+	enum abstract_types atype;
+	union {
+		union _lttng_basic_type basic;
+		struct {
+			struct lttng_basic_type elem_type;
+			unsigned int length;		/* num. elems. */
+		} array;
+		struct {
+			struct lttng_basic_type length_type;
+			struct lttng_basic_type elem_type;
+		} sequence;
+	} u;
+};
+
+struct lttng_enum {
+	const char *name;
+	struct lttng_type container_type;
+	const struct lttng_enum_entry *entries;
+	unsigned int len;
+};
+
+/* Event field description */
+
+struct lttng_event_field {
+	const char *name;
+	struct lttng_type type;
+};
+
+struct lttng_ctx_field {
+	const char *name;
+	struct lttng_type type;
+	void *callback;
+	union {
+		struct {
+			struct perf_event **e;	/* per-cpu array */
+			struct list_head head;
+			struct perf_event_attr *attr;
+		} perf_counter;
+	} u;
+};
+
+struct lttng_ctx {
+	struct lttng_ctx_field *fields;
+	unsigned int nr_fields;
+	unsigned int allocated_fields;
+};
+
+struct lttng_event_desc {
+	const char *name;
+	void *probe_callback;
+	const struct lttng_event_ctx *ctx;	/* context */
+	const struct lttng_event_field *fields;	/* event payload */
+	unsigned int nr_fields;
+};
+
+struct lttng_probe_desc {
+	const struct lttng_event_desc *event_desc;
+	unsigned int nr_events;
+	struct list_head head;			/* chain registered probes */
 };
 
 /*
@@ -22,40 +154,154 @@ enum instrum_type itype {
 struct ltt_event {
 	unsigned int id;
 	struct ltt_channel *chan;
-	void *probe;
+	const struct lttng_event_desc *desc;
 	void *filter;
-	char *name;
-	enum instrum_type itype;
+	enum lttng_kernel_instrumentation instrumentation;
+	union {
+		struct {
+			struct kprobe kp;
+			char *symbol_name;
+		} kprobe;
+		struct {
+			char *symbol_name;
+		} ftrace;
+	} u;
 	struct list_head list;		/* Event list */
+	int metadata_dumped:1;
+};
+
+struct ltt_channel_ops {
+	struct channel *(*channel_create)(const char *name,
+				struct ltt_channel *ltt_chan,
+				void *buf_addr,
+				size_t subbuf_size, size_t num_subbuf,
+				unsigned int switch_timer_interval,
+				unsigned int read_timer_interval);
+	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,
+			     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);
+	/*
+	 * packet_avail_size returns the available size in the current
+	 * packet. Note that the size returned is only a hint, since it
+	 * 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);
 };
 
 struct ltt_channel {
+	unsigned int id;
 	struct channel *chan;		/* Channel buffers */
 	/* 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 */
-	char name[PATH_MAX];
+	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;
 };
 
 struct ltt_session {
 	int active;			/* Is trace session active ? */
+	struct file *file;		/* File associated to session */
+	struct ltt_channel *metadata;	/* Metadata channel */
 	struct list_head chan;		/* Channel list head */
 	struct list_head events;	/* Event list head */
 	struct list_head list;		/* Session list */
-	char name[PATH_MAX];
+	unsigned int free_chan_id;	/* Next chan ID to allocate */
+	uuid_le uuid;			/* Trace session unique ID */
+	int metadata_dumped:1;
+};
+
+struct ltt_transport {
+	char *name;
+	struct module *owner;
+	struct list_head node;
+	struct ltt_channel_ops ops;
 };
 
 struct ltt_session *ltt_session_create(void);
-int ltt_session_destroy(struct ltt_session *session);
+int ltt_session_start(struct ltt_session *session);
+int ltt_session_stop(struct ltt_session *session);
+void ltt_session_destroy(struct ltt_session *session);
 
 struct ltt_channel *ltt_channel_create(struct ltt_session *session,
+				       const char *transport_name,
+				       void *buf_addr,
+				       size_t subbuf_size, size_t num_subbuf,
+				       unsigned int switch_timer_interval,
+				       unsigned int read_timer_interval);
+struct ltt_channel *ltt_global_channel_create(struct ltt_session *session,
 				       int overwrite, void *buf_addr,
 				       size_t subbuf_size, size_t num_subbuf,
 				       unsigned int switch_timer_interval,
 				       unsigned int read_timer_interval);
-int _ltt_channel_destroy(struct ltt_channel *chan);
 
-struct ltt_event *ltt_event_create(struct ltt_channel *chan, char *name,
+struct ltt_event *ltt_event_create(struct ltt_channel *chan,
+				   struct lttng_kernel_event *event_param,
 				   void *filter);
-int _ltt_event_destroy(struct ltt_event *event);
+
+void ltt_transport_register(struct ltt_transport *transport);
+void ltt_transport_unregister(struct ltt_transport *transport);
+
+int ltt_debugfs_abi_init(void);
+void ltt_debugfs_abi_exit(void);
+
+int ltt_probe_register(struct lttng_probe_desc *desc);
+void ltt_probe_unregister(struct lttng_probe_desc *desc);
+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);
+
+#ifdef CONFIG_KPROBES
+int lttng_kprobes_register(const char *name,
+		const char *symbol_name,
+		uint64_t offset,
+		uint64_t addr,
+		struct ltt_event *event);
+void lttng_kprobes_unregister(struct ltt_event *event);
+#else
+static inline
+int lttng_kprobes_register(const char *name,
+		const char *symbol_name,
+		uint64_t offset,
+		uint64_t addr,
+		struct ltt_event *event)
+{
+	return -ENOSYS;
+}
+
+static inline
+void lttng_kprobes_unregister(struct ltt_event *event)
+{
+}
+#endif
+
+#ifdef CONFIG_DYNAMIC_FTRACE
+int lttng_ftrace_register(const char *name,
+			  const char *symbol_name,
+			  struct ltt_event *event);
+void lttng_ftrace_unregister(struct ltt_event *event);
+#else
+static inline
+int lttng_ftrace_register(const char *name,
+			  const char *symbol_name,
+			  struct ltt_event *event)
+{
+	return -ENOSYS;
+}
+
+static inline
+void lttng_ftrace_unregister(struct ltt_event *event)
+{
+}
+#endif
+#endif /* _LTT_EVENTS_H */