[lttng-modules.git] / src / lttng-ring-buffer-event-notifier-client.h

/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
 *
 * lttng-ring-buffer-event-notifier-client.h
 *
 * LTTng lib ring buffer event notifier client template.
 *
 * Copyright (C) 2010-2020 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 */

#include <linux/module.h>
#include <linux/types.h>
#include <wrapper/vmalloc.h>	/* for wrapper_vmalloc_sync_mappings() */
#include <lttng/events.h>
#include <lttng/tracer.h>

static struct lttng_transport lttng_relay_transport;

struct event_notifier_packet_header {
	uint8_t  header_end[0];
};

struct event_notifier_record_header {
	uint8_t header_end[0];		/* End of header */
};

static const struct lib_ring_buffer_config client_config;

static inline
u64 lib_ring_buffer_clock_read(struct channel *chan)
{
	return 0;
}

static inline
size_t record_header_size(const struct lib_ring_buffer_config *config,
				 struct channel *chan, size_t offset,
				 size_t *pre_header_padding,
				 struct lib_ring_buffer_ctx *ctx,
				 void *client_ctx)
{
	return 0;
}

#include <ringbuffer/api.h>

static u64 client_ring_buffer_clock_read(struct channel *chan)
{
	return 0;
}

static
size_t client_record_header_size(const struct lib_ring_buffer_config *config,
				 struct channel *chan, size_t offset,
				 size_t *pre_header_padding,
				 struct lib_ring_buffer_ctx *ctx,
				 void *client_ctx)
{
	return 0;
}

/**
 * client_packet_header_size - called on buffer-switch to a new sub-buffer
 *
 * Return header size without padding after the structure. Don't use packed
 * structure because gcc generates inefficient code on some architectures
 * (powerpc, mips..)
 */
static size_t client_packet_header_size(void)
{
	return offsetof(struct event_notifier_packet_header, header_end);
}

static void client_buffer_begin(struct lib_ring_buffer *buf, u64 tsc,
				unsigned int subbuf_idx)
{
}

/*
 * offset is assumed to never be 0 here : never deliver a completely empty
 * subbuffer. data_size is between 1 and subbuf_size.
 */
static void client_buffer_end(struct lib_ring_buffer *buf, u64 tsc,
			      unsigned int subbuf_idx, unsigned long data_size)
{
}

static int client_buffer_create(struct lib_ring_buffer *buf, void *priv,
				int cpu, const char *name)
{
	return 0;
}

static void client_buffer_finalize(struct lib_ring_buffer *buf, void *priv, int cpu)
{
}

static int client_timestamp_begin(const struct lib_ring_buffer_config *config,
		struct lib_ring_buffer *buf, uint64_t *timestamp_begin)
{
	return -ENOSYS;
}

static int client_timestamp_end(const struct lib_ring_buffer_config *config,
			struct lib_ring_buffer *bufb,
			uint64_t *timestamp_end)
{
	return -ENOSYS;
}

static int client_events_discarded(const struct lib_ring_buffer_config *config,
			struct lib_ring_buffer *bufb,
			uint64_t *events_discarded)
{
	return -ENOSYS;
}

static int client_current_timestamp(const struct lib_ring_buffer_config *config,
		struct lib_ring_buffer *bufb,
		uint64_t *ts)
{
	return -ENOSYS;
}

static int client_content_size(const struct lib_ring_buffer_config *config,
			struct lib_ring_buffer *bufb,
			uint64_t *content_size)
{
	return -ENOSYS;
}

static int client_packet_size(const struct lib_ring_buffer_config *config,
			struct lib_ring_buffer *bufb,
			uint64_t *packet_size)
{
	return -ENOSYS;
}

static int client_stream_id(const struct lib_ring_buffer_config *config,
			struct lib_ring_buffer *bufb,
			uint64_t *stream_id)
{
	return -ENOSYS;
}

static int client_sequence_number(const struct lib_ring_buffer_config *config,
			struct lib_ring_buffer *bufb,
			uint64_t *seq)
{
	return -ENOSYS;
}

static
int client_instance_id(const struct lib_ring_buffer_config *config,
		struct lib_ring_buffer *bufb,
		uint64_t *id)
{
	return -ENOSYS;
}

static void client_record_get(const struct lib_ring_buffer_config *config,
	struct channel *chan, struct lib_ring_buffer *buf,
	size_t offset, size_t *header_len,
	size_t *payload_len, u64 *timestamp)
{
	struct event_notifier_record_header header;
	int ret;

	ret = lib_ring_buffer_read(&buf->backend, offset, &header,
			offsetof(struct event_notifier_record_header, header_end));
	CHAN_WARN_ON(chan, ret != offsetof(struct event_notifier_record_header, header_end));
	*header_len = offsetof(struct event_notifier_record_header, header_end);
	/*
	 * Currently, only 64-bit event notifier ID.
	 */
	*payload_len = sizeof(uint64_t);
	*timestamp = 0;
}

static const struct lib_ring_buffer_config client_config = {
	.cb.ring_buffer_clock_read = client_ring_buffer_clock_read,
	.cb.record_header_size = client_record_header_size,
	.cb.subbuffer_header_size = client_packet_header_size,
	.cb.buffer_begin = client_buffer_begin,
	.cb.buffer_end = client_buffer_end,
	.cb.buffer_create = client_buffer_create,
	.cb.buffer_finalize = client_buffer_finalize,
	.cb.record_get = client_record_get,

	.tsc_bits = 0,
	.alloc = RING_BUFFER_ALLOC_GLOBAL,
	.sync = RING_BUFFER_SYNC_GLOBAL,
	.mode = RING_BUFFER_MODE_TEMPLATE,
	.backend = RING_BUFFER_PAGE,
	.output = RING_BUFFER_OUTPUT_TEMPLATE,
	.oops = RING_BUFFER_OOPS_CONSISTENCY,
	.ipi = RING_BUFFER_NO_IPI_BARRIER,
	.wakeup = RING_BUFFER_WAKEUP_BY_WRITER,
};

static
void release_priv_ops(void *priv_ops)
{
	module_put(THIS_MODULE);
}

static
void lttng_channel_destroy(struct channel *chan)
{
	channel_destroy(chan);
}

static
struct channel *_channel_create(const char *name,
				void *priv, void *buf_addr,
				size_t subbuf_size, size_t num_subbuf,
				unsigned int switch_timer_interval,
				unsigned int read_timer_interval)
{
	struct lttng_event_notifier_group *event_notifier_group = priv;
	struct channel *chan;

	chan = channel_create(&client_config, name,
			      event_notifier_group, buf_addr,
			      subbuf_size, num_subbuf, switch_timer_interval,
			      read_timer_interval);
	if (chan) {
		/*
		 * Ensure this module is not unloaded before we finish
		 * using lttng_relay_transport.ops.
		 */
		if (!try_module_get(THIS_MODULE)) {
			printk(KERN_WARNING "LTTng: Can't lock event_notifier transport module.\n");
			goto error;
		}
		chan->backend.priv_ops = &lttng_relay_transport.ops;
		chan->backend.release_priv_ops = release_priv_ops;
	}
	return chan;

error:
	lttng_channel_destroy(chan);
	return NULL;
}

static
struct lib_ring_buffer *lttng_buffer_read_open(struct channel *chan)
{
	struct lib_ring_buffer *buf;

	buf = channel_get_ring_buffer(&client_config, chan, 0);
	if (!lib_ring_buffer_open_read(buf))
		return buf;
	return NULL;
}

static
int lttng_buffer_has_read_closed_stream(struct channel *chan)
{
	struct lib_ring_buffer *buf;
	int cpu;

	for_each_channel_cpu(cpu, chan) {
		buf = channel_get_ring_buffer(&client_config, chan, cpu);
		if (!atomic_long_read(&buf->active_readers))
			return 1;
	}
	return 0;
}

static
void lttng_buffer_read_close(struct lib_ring_buffer *buf)
{
	lib_ring_buffer_release_read(buf);
}

static
int lttng_event_reserve(struct lib_ring_buffer_ctx *ctx, uint32_t event_id)
{
	int ret;

	ret = lib_ring_buffer_reserve(&client_config, ctx, NULL);
	if (ret)
		return ret;
	lib_ring_buffer_backend_get_pages(&client_config, ctx,
			&ctx->backend_pages);
	return 0;
}

static
void lttng_event_commit(struct lib_ring_buffer_ctx *ctx)
{
	lib_ring_buffer_commit(&client_config, ctx);
}

static
void lttng_event_write(struct lib_ring_buffer_ctx *ctx, const void *src,
		     size_t len)
{
	lib_ring_buffer_write(&client_config, ctx, src, len);
}

static
void lttng_event_write_from_user(struct lib_ring_buffer_ctx *ctx,
			       const void __user *src, size_t len)
{
	lib_ring_buffer_copy_from_user_inatomic(&client_config, ctx, src, len);
}

static
void lttng_event_memset(struct lib_ring_buffer_ctx *ctx,
		int c, size_t len)
{
	lib_ring_buffer_memset(&client_config, ctx, c, len);
}

static
void lttng_event_strcpy(struct lib_ring_buffer_ctx *ctx, const char *src,
		size_t len)
{
	lib_ring_buffer_strcpy(&client_config, ctx, src, len, '#');
}

static
size_t lttng_packet_avail_size(struct channel *chan)
{
	unsigned long o_begin;
	struct lib_ring_buffer *buf;

	buf = chan->backend.buf;	/* Only for global buffer ! */
	o_begin = v_read(&client_config, &buf->offset);
	if (subbuf_offset(o_begin, chan) != 0) {
		return chan->backend.subbuf_size - subbuf_offset(o_begin, chan);
	} else {
		return chan->backend.subbuf_size - subbuf_offset(o_begin, chan)
			- sizeof(struct event_notifier_packet_header);
	}
}

static
wait_queue_head_t *lttng_get_writer_buf_wait_queue(struct channel *chan, int cpu)
{
	struct lib_ring_buffer *buf = channel_get_ring_buffer(&client_config,
					chan, cpu);
	return &buf->write_wait;
}

static
wait_queue_head_t *lttng_get_hp_wait_queue(struct channel *chan)
{
	return &chan->hp_wait;
}

static
int lttng_is_finalized(struct channel *chan)
{
	return lib_ring_buffer_channel_is_finalized(chan);
}

static
int lttng_is_disabled(struct channel *chan)
{
	return lib_ring_buffer_channel_is_disabled(chan);
}

static struct lttng_transport lttng_relay_transport = {
	.name = "relay-" RING_BUFFER_MODE_TEMPLATE_STRING,
	.owner = THIS_MODULE,
	.ops = {
		.channel_create = _channel_create,
		.channel_destroy = lttng_channel_destroy,
		.buffer_read_open = lttng_buffer_read_open,
		.buffer_has_read_closed_stream =
			lttng_buffer_has_read_closed_stream,
		.buffer_read_close = lttng_buffer_read_close,
		.event_reserve = lttng_event_reserve,
		.event_commit = lttng_event_commit,
		.event_write_from_user = lttng_event_write_from_user,
		.event_memset = lttng_event_memset,
		.event_write = lttng_event_write,
		.event_strcpy = lttng_event_strcpy,
		.packet_avail_size = lttng_packet_avail_size,
		.get_writer_buf_wait_queue = lttng_get_writer_buf_wait_queue,
		.get_hp_wait_queue = lttng_get_hp_wait_queue,
		.is_finalized = lttng_is_finalized,
		.is_disabled = lttng_is_disabled,
		.timestamp_begin = client_timestamp_begin,
		.timestamp_end = client_timestamp_end,
		.events_discarded = client_events_discarded,
		.content_size = client_content_size,
		.packet_size = client_packet_size,
		.stream_id = client_stream_id,
		.current_timestamp = client_current_timestamp,
		.sequence_number = client_sequence_number,
		.instance_id = client_instance_id,
	},
};

static int __init lttng_ring_buffer_event_notifier_client_init(void)
{
	/*
	 * This vmalloc sync all also takes care of the lib ring buffer
	 * vmalloc'd module pages when it is built as a module into LTTng.
	 */
	wrapper_vmalloc_sync_mappings();
	lttng_transport_register(&lttng_relay_transport);
	return 0;
}

module_init(lttng_ring_buffer_event_notifier_client_init);

static void __exit lttng_ring_buffer_event_notifier_client_exit(void)
{
	lttng_transport_unregister(&lttng_relay_transport);
}

module_exit(lttng_ring_buffer_event_notifier_client_exit);

MODULE_LICENSE("GPL and additional rights");
MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
MODULE_DESCRIPTION("LTTng ring buffer " RING_BUFFER_MODE_TEMPLATE_STRING
		   " client");
MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
	__stringify(LTTNG_MODULES_MINOR_VERSION) "."
	__stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
	LTTNG_MODULES_EXTRAVERSION);
Commit	Line	Data
250c663f MD	1	/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
	2	*
	3	* lttng-ring-buffer-event-notifier-client.h
	4	*
	5	* LTTng lib ring buffer event notifier client template.
	6	*
	7	* Copyright (C) 2010-2020 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	8	*/
	9
	10	#include <linux/module.h>
	11	#include <linux/types.h>
	12	#include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */
	13	#include <lttng/events.h>
	14	#include <lttng/tracer.h>
	15
	16	static struct lttng_transport lttng_relay_transport;
	17
	18	struct event_notifier_packet_header {
	19	uint8_t header_end[0];
	20	};
	21
	22	struct event_notifier_record_header {
	23	uint8_t header_end[0]; /* End of header */
	24	};
	25
	26	static const struct lib_ring_buffer_config client_config;
	27
	28	static inline
	29	u64 lib_ring_buffer_clock_read(struct channel *chan)
	30	{
	31	return 0;
	32	}
	33
	34	static inline
	35	size_t record_header_size(const struct lib_ring_buffer_config *config,
	36	struct channel *chan, size_t offset,
	37	size_t *pre_header_padding,
	38	struct lib_ring_buffer_ctx *ctx,
	39	void *client_ctx)
	40	{
	41	return 0;
	42	}
	43
	44	#include <ringbuffer/api.h>
	45
	46	static u64 client_ring_buffer_clock_read(struct channel *chan)
	47	{
	48	return 0;
	49	}
	50
	51	static
	52	size_t client_record_header_size(const struct lib_ring_buffer_config *config,
	53	struct channel *chan, size_t offset,
	54	size_t *pre_header_padding,
	55	struct lib_ring_buffer_ctx *ctx,
	56	void *client_ctx)
	57	{
	58	return 0;
	59	}
	60
	61	/**
	62	* client_packet_header_size - called on buffer-switch to a new sub-buffer
	63	*
	64	* Return header size without padding after the structure. Don't use packed
65	* structure because gcc generates inefficient code on some architectures
66	* (powerpc, mips..)
67	*/
68	static size_t client_packet_header_size(void)
69	{
70	return offsetof(struct event_notifier_packet_header, header_end);
71	}
72
73	static void client_buffer_begin(struct lib_ring_buffer *buf, u64 tsc,
74	unsigned int subbuf_idx)
75	{
76	}
77
78	/*
79	* offset is assumed to never be 0 here : never deliver a completely empty
80	* subbuffer. data_size is between 1 and subbuf_size.
81	*/
82	static void client_buffer_end(struct lib_ring_buffer *buf, u64 tsc,
83	unsigned int subbuf_idx, unsigned long data_size)
84	{
85	}
86
87	static int client_buffer_create(struct lib_ring_buffer buf, void priv,
88	int cpu, const char *name)
89	{
90	return 0;
91	}
92
93	static void client_buffer_finalize(struct lib_ring_buffer buf, void priv, int cpu)
94	{
95	}
96
97	static int client_timestamp_begin(const struct lib_ring_buffer_config *config,
98	struct lib_ring_buffer buf, uint64_t timestamp_begin)
99	{
100	return -ENOSYS;
101	}
102
103	static int client_timestamp_end(const struct lib_ring_buffer_config *config,
104	struct lib_ring_buffer *bufb,
105	uint64_t *timestamp_end)
106	{
107	return -ENOSYS;
108	}
109
110	static int client_events_discarded(const struct lib_ring_buffer_config *config,
111	struct lib_ring_buffer *bufb,
112	uint64_t *events_discarded)
113	{
114	return -ENOSYS;
115	}
116
117	static int client_current_timestamp(const struct lib_ring_buffer_config *config,
118	struct lib_ring_buffer *bufb,
119	uint64_t *ts)
120	{
121	return -ENOSYS;
122	}
123
124	static int client_content_size(const struct lib_ring_buffer_config *config,
125	struct lib_ring_buffer *bufb,
126	uint64_t *content_size)
127	{
128	return -ENOSYS;
129	}
130
131	static int client_packet_size(const struct lib_ring_buffer_config *config,
132	struct lib_ring_buffer *bufb,
133	uint64_t *packet_size)
134	{
135	return -ENOSYS;
136	}
137
138	static int client_stream_id(const struct lib_ring_buffer_config *config,
139	struct lib_ring_buffer *bufb,
140	uint64_t *stream_id)
141	{
142	return -ENOSYS;
143	}
144
145	static int client_sequence_number(const struct lib_ring_buffer_config *config,
146	struct lib_ring_buffer *bufb,
147	uint64_t *seq)
148	{
149	return -ENOSYS;
150	}
151
152	static
153	int client_instance_id(const struct lib_ring_buffer_config *config,
154	struct lib_ring_buffer *bufb,
155	uint64_t *id)
156	{
157	return -ENOSYS;
158	}
159
160	static void client_record_get(const struct lib_ring_buffer_config *config,
161	struct channel chan, struct lib_ring_buffer buf,
162	size_t offset, size_t *header_len,
163	size_t payload_len, u64 timestamp)
164	{
165	struct event_notifier_record_header header;
166	int ret;
167
168	ret = lib_ring_buffer_read(&buf->backend, offset, &header,
169	offsetof(struct event_notifier_record_header, header_end));
170	CHAN_WARN_ON(chan, ret != offsetof(struct event_notifier_record_header, header_end));
171	*header_len = offsetof(struct event_notifier_record_header, header_end);
172	/*
173	* Currently, only 64-bit event notifier ID.
174	*/
175	*payload_len = sizeof(uint64_t);
176	*timestamp = 0;
177	}
178
179	static const struct lib_ring_buffer_config client_config = {
180	.cb.ring_buffer_clock_read = client_ring_buffer_clock_read,
181	.cb.record_header_size = client_record_header_size,
182	.cb.subbuffer_header_size = client_packet_header_size,
183	.cb.buffer_begin = client_buffer_begin,
184	.cb.buffer_end = client_buffer_end,
185	.cb.buffer_create = client_buffer_create,
186	.cb.buffer_finalize = client_buffer_finalize,
187	.cb.record_get = client_record_get,
188
189	.tsc_bits = 0,
190	.alloc = RING_BUFFER_ALLOC_GLOBAL,
191	.sync = RING_BUFFER_SYNC_GLOBAL,
192	.mode = RING_BUFFER_MODE_TEMPLATE,
193	.backend = RING_BUFFER_PAGE,
194	.output = RING_BUFFER_OUTPUT_TEMPLATE,
195	.oops = RING_BUFFER_OOPS_CONSISTENCY,
196	.ipi = RING_BUFFER_NO_IPI_BARRIER,
197	.wakeup = RING_BUFFER_WAKEUP_BY_WRITER,
198	};
199
200	static
201	void release_priv_ops(void *priv_ops)
202	{
203	module_put(THIS_MODULE);
204	}
205
206	static
207	void lttng_channel_destroy(struct channel *chan)
208	{
209	channel_destroy(chan);
210	}
211
212	static
213	struct channel _channel_create(const char name,
214	void priv, void buf_addr,
215	size_t subbuf_size, size_t num_subbuf,
216	unsigned int switch_timer_interval,
217	unsigned int read_timer_interval)
218	{
219	struct lttng_event_notifier_group *event_notifier_group = priv;
220	struct channel *chan;
221
222	chan = channel_create(&client_config, name,
223	event_notifier_group, buf_addr,
224	subbuf_size, num_subbuf, switch_timer_interval,
225	read_timer_interval);
226	if (chan) {
227	/*
228	* Ensure this module is not unloaded before we finish
229	* using lttng_relay_transport.ops.
230	*/
231	if (!try_module_get(THIS_MODULE)) {
232	printk(KERN_WARNING "LTTng: Can't lock event_notifier transport module.\n");
233	goto error;
234	}
235	chan->backend.priv_ops = &lttng_relay_transport.ops;
236	chan->backend.release_priv_ops = release_priv_ops;
237	}
238	return chan;
239
240	error:
241	lttng_channel_destroy(chan);
242	return NULL;
243	}
244
245	static
246	struct lib_ring_buffer lttng_buffer_read_open(struct channel chan)
247	{
248	struct lib_ring_buffer *buf;
249
250	buf = channel_get_ring_buffer(&client_config, chan, 0);
251	if (!lib_ring_buffer_open_read(buf))
252	return buf;
253	return NULL;
254	}
255
256	static
257	int lttng_buffer_has_read_closed_stream(struct channel *chan)
258	{
259	struct lib_ring_buffer *buf;
260	int cpu;
261
262	for_each_channel_cpu(cpu, chan) {
263	buf = channel_get_ring_buffer(&client_config, chan, cpu);
264	if (!atomic_long_read(&buf->active_readers))
265	return 1;
266	}
267	return 0;
268	}
269
270	static
271	void lttng_buffer_read_close(struct lib_ring_buffer *buf)
272	{
273	lib_ring_buffer_release_read(buf);
274	}
275
276	static
277	int lttng_event_reserve(struct lib_ring_buffer_ctx *ctx, uint32_t event_id)
278	{
279	int ret;
280
281	ret = lib_ring_buffer_reserve(&client_config, ctx, NULL);
282	if (ret)
283	return ret;
284	lib_ring_buffer_backend_get_pages(&client_config, ctx,
285	&ctx->backend_pages);
286	return 0;
287	}
288
289	static
290	void lttng_event_commit(struct lib_ring_buffer_ctx *ctx)
291	{
292	lib_ring_buffer_commit(&client_config, ctx);
293	}
294
295	static
296	void lttng_event_write(struct lib_ring_buffer_ctx ctx, const void src,
297	size_t len)
298	{
299	lib_ring_buffer_write(&client_config, ctx, src, len);
300	}
301
302	static
303	void lttng_event_write_from_user(struct lib_ring_buffer_ctx *ctx,
304	const void __user *src, size_t len)
305	{
306	lib_ring_buffer_copy_from_user_inatomic(&client_config, ctx, src, len);
307	}
308
309	static
310	void lttng_event_memset(struct lib_ring_buffer_ctx *ctx,
311	int c, size_t len)
312	{
313	lib_ring_buffer_memset(&client_config, ctx, c, len);
314	}
315
316	static
317	void lttng_event_strcpy(struct lib_ring_buffer_ctx ctx, const char src,
318	size_t len)
319	{
320	lib_ring_buffer_strcpy(&client_config, ctx, src, len, '#');
321	}
322
323	static
324	size_t lttng_packet_avail_size(struct channel *chan)
325	{
326	unsigned long o_begin;
327	struct lib_ring_buffer *buf;
328
329	buf = chan->backend.buf; /* Only for global buffer ! */
330	o_begin = v_read(&client_config, &buf->offset);
331	if (subbuf_offset(o_begin, chan) != 0) {
332	return chan->backend.subbuf_size - subbuf_offset(o_begin, chan);
333	} else {
334	return chan->backend.subbuf_size - subbuf_offset(o_begin, chan)
335	- sizeof(struct event_notifier_packet_header);
336	}
337	}
338
339	static
340	wait_queue_head_t lttng_get_writer_buf_wait_queue(struct channel chan, int cpu)
341	{
342	struct lib_ring_buffer *buf = channel_get_ring_buffer(&client_config,
343	chan, cpu);
344	return &buf->write_wait;
345	}
346
347	static
348	wait_queue_head_t lttng_get_hp_wait_queue(struct channel chan)
349	{
350	return &chan->hp_wait;
351	}
352
353	static
354	int lttng_is_finalized(struct channel *chan)
355	{
356	return lib_ring_buffer_channel_is_finalized(chan);
357	}
358
359	static
360	int lttng_is_disabled(struct channel *chan)
361	{
362	return lib_ring_buffer_channel_is_disabled(chan);
363	}
364
365	static struct lttng_transport lttng_relay_transport = {
366	.name = "relay-" RING_BUFFER_MODE_TEMPLATE_STRING,
367	.owner = THIS_MODULE,
368	.ops = {
369	.channel_create = _channel_create,
370	.channel_destroy = lttng_channel_destroy,
371	.buffer_read_open = lttng_buffer_read_open,
372	.buffer_has_read_closed_stream =
373	lttng_buffer_has_read_closed_stream,
374	.buffer_read_close = lttng_buffer_read_close,
375	.event_reserve = lttng_event_reserve,
376	.event_commit = lttng_event_commit,
377	.event_write_from_user = lttng_event_write_from_user,
378	.event_memset = lttng_event_memset,
379	.event_write = lttng_event_write,
380	.event_strcpy = lttng_event_strcpy,
381	.packet_avail_size = lttng_packet_avail_size,
382	.get_writer_buf_wait_queue = lttng_get_writer_buf_wait_queue,
383	.get_hp_wait_queue = lttng_get_hp_wait_queue,
384	.is_finalized = lttng_is_finalized,
385	.is_disabled = lttng_is_disabled,
386	.timestamp_begin = client_timestamp_begin,
387	.timestamp_end = client_timestamp_end,
388	.events_discarded = client_events_discarded,
389	.content_size = client_content_size,
390	.packet_size = client_packet_size,
391	.stream_id = client_stream_id,
392	.current_timestamp = client_current_timestamp,
393	.sequence_number = client_sequence_number,
394	.instance_id = client_instance_id,
395	},
396	};
397
398	static int __init lttng_ring_buffer_event_notifier_client_init(void)
399	{
400	/*
401	* This vmalloc sync all also takes care of the lib ring buffer
402	* vmalloc'd module pages when it is built as a module into LTTng.
403	*/
404	wrapper_vmalloc_sync_mappings();
405	lttng_transport_register(&lttng_relay_transport);
406	return 0;
407	}
408
409	module_init(lttng_ring_buffer_event_notifier_client_init);
410
411	static void __exit lttng_ring_buffer_event_notifier_client_exit(void)
412	{
413	lttng_transport_unregister(&lttng_relay_transport);
414	}
415
416	module_exit(lttng_ring_buffer_event_notifier_client_exit);
417
418	MODULE_LICENSE("GPL and additional rights");
419	MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
420	MODULE_DESCRIPTION("LTTng ring buffer " RING_BUFFER_MODE_TEMPLATE_STRING
421	" client");
422	MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
423	__stringify(LTTNG_MODULES_MINOR_VERSION) "."
424	__stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
425	LTTNG_MODULES_EXTRAVERSION);