[lttng-ust.git] / liblttng-ust / lttng-ring-buffer-metadata-client.h

/*
 * SPDX-License-Identifier: LGPL-2.1-only
 *
 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * LTTng lib ring buffer client template.
 */

#include <stddef.h>
#include <stdint.h>

#include <ust-events-internal.h>
#include "ust-bitfield.h"
#include "ust-compat.h"
#include "lttng-tracer.h"
#include "../libringbuffer/frontend_types.h"

struct metadata_packet_header {
	uint32_t magic;			/* 0x75D11D57 */
	uint8_t  uuid[LTTNG_UST_UUID_LEN]; /* Unique Universal Identifier */
	uint32_t checksum;		/* 0 if unused */
	uint32_t content_size;		/* in bits */
	uint32_t packet_size;		/* in bits */
	uint8_t  compression_scheme;	/* 0 if unused */
	uint8_t  encryption_scheme;	/* 0 if unused */
	uint8_t  checksum_scheme;	/* 0 if unused */
	uint8_t  major;			/* CTF spec major version number */
	uint8_t  minor;			/* CTF spec minor version number */
	uint8_t  header_end[0];
};

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

static const struct lttng_ust_lib_ring_buffer_config client_config;

static inline uint64_t lib_ring_buffer_clock_read(struct lttng_ust_lib_ring_buffer_channel *chan)
{
	return 0;
}

static inline
size_t record_header_size(const struct lttng_ust_lib_ring_buffer_config *config,
				 struct lttng_ust_lib_ring_buffer_channel *chan,
				 size_t offset,
				 size_t *pre_header_padding,
				 struct lttng_ust_lib_ring_buffer_ctx *ctx,
				 void *client_ctx)
{
	return 0;
}

#include "../libringbuffer/api.h"
#include "lttng-rb-clients.h"

static uint64_t client_ring_buffer_clock_read(struct lttng_ust_lib_ring_buffer_channel *chan)
{
	return 0;
}

static
size_t client_record_header_size(const struct lttng_ust_lib_ring_buffer_config *config,
				 struct lttng_ust_lib_ring_buffer_channel *chan,
				 size_t offset,
				 size_t *pre_header_padding,
				 struct lttng_ust_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 metadata_packet_header, header_end);
}

static void client_buffer_begin(struct lttng_ust_lib_ring_buffer *buf, uint64_t tsc,
				unsigned int subbuf_idx,
				struct lttng_ust_shm_handle *handle)
{
	struct lttng_ust_lib_ring_buffer_channel *chan = shmp(handle, buf->backend.chan);
	struct metadata_packet_header *header =
		(struct metadata_packet_header *)
			lib_ring_buffer_offset_address(&buf->backend,
				subbuf_idx * chan->backend.subbuf_size,
				handle);
	struct lttng_ust_channel_buffer *lttng_chan = channel_get_private(chan);

	assert(header);
	if (!header)
		return;
	header->magic = TSDL_MAGIC_NUMBER;
	memcpy(header->uuid, lttng_chan->priv->uuid, sizeof(lttng_chan->priv->uuid));
	header->checksum = 0;		/* 0 if unused */
	header->content_size = 0xFFFFFFFF; /* in bits, for debugging */
	header->packet_size = 0xFFFFFFFF;  /* in bits, for debugging */
	header->compression_scheme = 0;	/* 0 if unused */
	header->encryption_scheme = 0;	/* 0 if unused */
	header->checksum_scheme = 0;	/* 0 if unused */
	header->major = CTF_SPEC_MAJOR;
	header->minor = CTF_SPEC_MINOR;
}

/*
 * 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 lttng_ust_lib_ring_buffer *buf, uint64_t tsc,
			      unsigned int subbuf_idx, unsigned long data_size,
			      struct lttng_ust_shm_handle *handle)
{
	struct lttng_ust_lib_ring_buffer_channel *chan = shmp(handle, buf->backend.chan);
	struct metadata_packet_header *header =
		(struct metadata_packet_header *)
			lib_ring_buffer_offset_address(&buf->backend,
				subbuf_idx * chan->backend.subbuf_size,
				handle);
	unsigned long records_lost = 0;

	assert(header);
	if (!header)
		return;
	header->content_size = data_size * CHAR_BIT;		/* in bits */
	header->packet_size = LTTNG_UST_PAGE_ALIGN(data_size) * CHAR_BIT; /* in bits */
	/*
	 * We do not care about the records lost count, because the metadata
	 * channel waits and retry.
	 */
	(void) lib_ring_buffer_get_records_lost_full(&client_config, buf);
	records_lost += lib_ring_buffer_get_records_lost_wrap(&client_config, buf);
	records_lost += lib_ring_buffer_get_records_lost_big(&client_config, buf);
	WARN_ON_ONCE(records_lost != 0);
}

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

static void client_buffer_finalize(struct lttng_ust_lib_ring_buffer *buf,
				   void *priv, int cpu,
				   struct lttng_ust_shm_handle *handle)
{
}

static const
struct lttng_ust_client_lib_ring_buffer_client_cb client_cb = {
	.parent = {
		.ring_buffer_clock_read = client_ring_buffer_clock_read,
		.record_header_size = client_record_header_size,
		.subbuffer_header_size = client_packet_header_size,
		.buffer_begin = client_buffer_begin,
		.buffer_end = client_buffer_end,
		.buffer_create = client_buffer_create,
		.buffer_finalize = client_buffer_finalize,
	},
};

static const struct lttng_ust_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,

	.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_MMAP,
	.oops = RING_BUFFER_OOPS_CONSISTENCY,
	.ipi = RING_BUFFER_NO_IPI_BARRIER,
	.wakeup = RING_BUFFER_WAKEUP_BY_WRITER,
	.client_type = LTTNG_CLIENT_TYPE,

	 .cb_ptr = &client_cb.parent,
};

static
struct lttng_ust_channel_buffer *_channel_create(const char *name,
				void *buf_addr,
				size_t subbuf_size, size_t num_subbuf,
				unsigned int switch_timer_interval,
				unsigned int read_timer_interval,
				unsigned char *uuid,
				uint32_t chan_id,
				const int *stream_fds, int nr_stream_fds,
				int64_t blocking_timeout)
{
	struct lttng_ust_abi_channel_config chan_priv_init;
	struct lttng_ust_shm_handle *handle;
	struct lttng_ust_channel_buffer *lttng_chan_buf;

	lttng_chan_buf = lttng_ust_alloc_channel_buffer();
	if (!lttng_chan_buf)
		return NULL;
	memcpy(lttng_chan_buf->priv->uuid, uuid, LTTNG_UST_UUID_LEN);
	lttng_chan_buf->priv->id = chan_id;

	memset(&chan_priv_init, 0, sizeof(chan_priv_init));
	memcpy(chan_priv_init.uuid, uuid, LTTNG_UST_UUID_LEN);
	chan_priv_init.id = chan_id;

	handle = channel_create(&client_config, name,
			__alignof__(struct lttng_ust_channel_buffer),
			sizeof(struct lttng_ust_channel_buffer),
			&chan_priv_init,
			lttng_chan_buf, buf_addr, subbuf_size, num_subbuf,
			switch_timer_interval, read_timer_interval,
			stream_fds, nr_stream_fds, blocking_timeout);
	if (!handle)
		goto error;
	lttng_chan_buf->handle = handle;
	lttng_chan_buf->chan = shmp(handle, handle->chan);
	return lttng_chan_buf;

error:
	lttng_ust_free_channel_common(lttng_chan_buf->parent);
	return NULL;
}

static
void lttng_channel_destroy(struct lttng_ust_channel_buffer *lttng_chan_buf)
{
	channel_destroy(lttng_chan_buf->chan, lttng_chan_buf->handle, 1);
	lttng_ust_free_channel_common(lttng_chan_buf->parent);
}

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

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

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

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

static
size_t lttng_packet_avail_size(struct lttng_ust_lib_ring_buffer_channel *chan,
		struct lttng_ust_shm_handle *handle)
{
	unsigned long o_begin;
	struct lttng_ust_lib_ring_buffer *buf;

	buf = shmp(handle, chan->backend.buf[0].shmp);	/* 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 metadata_packet_header);
	}
}

#if 0
static
wait_queue_head_t *lttng_get_reader_wait_queue(struct lttng_ust_lib_ring_buffer_channel *chan)
{
	return &chan->read_wait;
}

static
wait_queue_head_t *lttng_get_hp_wait_queue(struct lttng_ust_lib_ring_buffer_channel *chan)
{
	return &chan->hp_wait;
}
#endif //0

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

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

static
int lttng_flush_buffer(struct lttng_ust_lib_ring_buffer_channel *chan,
		struct lttng_ust_shm_handle *handle)
{
	struct lttng_ust_lib_ring_buffer *buf;
	int shm_fd, wait_fd, wakeup_fd;
	uint64_t memory_map_size;

	buf = channel_get_ring_buffer(&client_config, chan,
			0, handle, &shm_fd, &wait_fd, &wakeup_fd,
			&memory_map_size);
	lib_ring_buffer_switch(&client_config, buf,
			SWITCH_ACTIVE, handle);
	return 0;
}

static struct lttng_transport lttng_relay_transport = {
	.name = "relay-" RING_BUFFER_MODE_TEMPLATE_STRING "-mmap",
	.ops = {
		.struct_size = sizeof(struct lttng_ust_channel_ops),

		.priv = __LTTNG_COMPOUND_LITERAL(struct lttng_ust_channel_ops_private, {
			.pub = &lttng_relay_transport.ops,
			.channel_create = _channel_create,
			.channel_destroy = lttng_channel_destroy,
			.packet_avail_size = lttng_packet_avail_size,
			.is_finalized = lttng_is_finalized,
			.is_disabled = lttng_is_disabled,
			.flush_buffer = lttng_flush_buffer,
		}),
		.event_reserve = lttng_event_reserve,
		.event_commit = lttng_event_commit,
		.event_write = lttng_event_write,
	},
	.client_config = &client_config,
};

void RING_BUFFER_MODE_TEMPLATE_INIT(void)
{
	DBG("LTT : ltt ring buffer client \"%s\" init\n",
		"relay-" RING_BUFFER_MODE_TEMPLATE_STRING "-mmap");
	lttng_transport_register(&lttng_relay_transport);
}

void RING_BUFFER_MODE_TEMPLATE_EXIT(void)
{
	DBG("LTT : ltt ring buffer client \"%s\" exit\n",
		"relay-" RING_BUFFER_MODE_TEMPLATE_STRING "-mmap");
	lttng_transport_unregister(&lttng_relay_transport);
}
Commit	Line	Data
3d1fc7fd	1	/*
c0c0989a	2	* SPDX-License-Identifier: LGPL-2.1-only
3d1fc7fd	3	*
e92f3e28 MD	4	* Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
e92f3e28 MD	5	*
c0c0989a	6	* LTTng lib ring buffer client template.
3d1fc7fd MD	7	*/
3d1fc7fd MD	8
b4051ad8	9	#include <stddef.h>
9f3fdbc6	10	#include <stdint.h>
7753d283 MJ	11
7753d283 MJ	12	#include <ust-events-internal.h>
ae4b659d	13	#include "ust-bitfield.h"
cd61d9bf	14	#include "ust-compat.h"
7dd08bec	15	#include "lttng-tracer.h"
9f3fdbc6	16	#include "../libringbuffer/frontend_types.h"
3d1fc7fd MD	17
	18	struct metadata_packet_header {
	19	uint32_t magic; /* 0x75D11D57 */
19d8b1b3	20	uint8_t uuid[LTTNG_UST_UUID_LEN]; /* Unique Universal Identifier */
3d1fc7fd MD	21	uint32_t checksum; /* 0 if unused */
	22	uint32_t content_size; /* in bits */
	23	uint32_t packet_size; /* in bits */
	24	uint8_t compression_scheme; /* 0 if unused */
	25	uint8_t encryption_scheme; /* 0 if unused */
	26	uint8_t checksum_scheme; /* 0 if unused */
8a98a75d MD	27	uint8_t major; /* CTF spec major version number */
8a98a75d MD	28	uint8_t minor; /* CTF spec minor version number */
3d1fc7fd MD	29	uint8_t header_end[0];
	30	};
	31
	32	struct metadata_record_header {
	33	uint8_t header_end[0]; /* End of header */
	34	};
	35
4cfec15c	36	static const struct lttng_ust_lib_ring_buffer_config client_config;
3d1fc7fd	37
5198080d	38	static inline uint64_t lib_ring_buffer_clock_read(struct lttng_ust_lib_ring_buffer_channel *chan)
3d1fc7fd MD	39	{
	40	return 0;
	41	}
	42
	43	static inline
8ca68914	44	size_t record_header_size(const struct lttng_ust_lib_ring_buffer_config *config,
5198080d MJ	45	struct lttng_ust_lib_ring_buffer_channel *chan,
5198080d MJ	46	size_t offset,
3d1fc7fd	47	size_t *pre_header_padding,
e56bb47c MD	48	struct lttng_ust_lib_ring_buffer_ctx *ctx,
e56bb47c MD	49	void *client_ctx)
3d1fc7fd MD	50	{
	51	return 0;
	52	}
	53
9f3fdbc6	54	#include "../libringbuffer/api.h"
82b9bde8	55	#include "lttng-rb-clients.h"
3d1fc7fd	56
5198080d	57	static uint64_t client_ring_buffer_clock_read(struct lttng_ust_lib_ring_buffer_channel *chan)
3d1fc7fd MD	58	{
	59	return 0;
	60	}
	61
	62	static
4cfec15c	63	size_t client_record_header_size(const struct lttng_ust_lib_ring_buffer_config *config,
5198080d MJ	64	struct lttng_ust_lib_ring_buffer_channel *chan,
5198080d MJ	65	size_t offset,
3d1fc7fd	66	size_t *pre_header_padding,
e56bb47c MD	67	struct lttng_ust_lib_ring_buffer_ctx *ctx,
e56bb47c MD	68	void *client_ctx)
3d1fc7fd MD	69	{
	70	return 0;
	71	}
	72
	73	/**
	74	* client_packet_header_size - called on buffer-switch to a new sub-buffer
	75	*
	76	* Return header size without padding after the structure. Don't use packed
	77	* structure because gcc generates inefficient code on some architectures
	78	* (powerpc, mips..)
	79	*/
	80	static size_t client_packet_header_size(void)
	81	{
	82	return offsetof(struct metadata_packet_header, header_end);
	83	}
	84
23c8854a	85	static void client_buffer_begin(struct lttng_ust_lib_ring_buffer *buf, uint64_t tsc,
1d498196	86	unsigned int subbuf_idx,
38fae1d3	87	struct lttng_ust_shm_handle *handle)
3d1fc7fd	88	{
5198080d	89	struct lttng_ust_lib_ring_buffer_channel *chan = shmp(handle, buf->backend.chan);
3d1fc7fd MD	90	struct metadata_packet_header *header =
	91	(struct metadata_packet_header *)
	92	lib_ring_buffer_offset_address(&buf->backend,
1d498196 MD	93	subbuf_idx * chan->backend.subbuf_size,
1d498196 MD	94	handle);
e7bc0ef6	95	struct lttng_ust_channel_buffer *lttng_chan = channel_get_private(chan);
3d1fc7fd	96
34daae3e MD	97	assert(header);
	98	if (!header)
	99	return;
3d1fc7fd	100	header->magic = TSDL_MAGIC_NUMBER;
e7bc0ef6	101	memcpy(header->uuid, lttng_chan->priv->uuid, sizeof(lttng_chan->priv->uuid));
3d1fc7fd MD	102	header->checksum = 0; /* 0 if unused */
	103	header->content_size = 0xFFFFFFFF; /* in bits, for debugging */
	104	header->packet_size = 0xFFFFFFFF; /* in bits, for debugging */
	105	header->compression_scheme = 0; /* 0 if unused */
	106	header->encryption_scheme = 0; /* 0 if unused */
	107	header->checksum_scheme = 0; /* 0 if unused */
8a98a75d MD	108	header->major = CTF_SPEC_MAJOR;
8a98a75d MD	109	header->minor = CTF_SPEC_MINOR;
3d1fc7fd MD	110	}
	111
	112	/*
	113	* offset is assumed to never be 0 here : never deliver a completely empty
	114	* subbuffer. data_size is between 1 and subbuf_size.
	115	*/
23c8854a	116	static void client_buffer_end(struct lttng_ust_lib_ring_buffer *buf, uint64_t tsc,
1d498196	117	unsigned int subbuf_idx, unsigned long data_size,
38fae1d3	118	struct lttng_ust_shm_handle *handle)
3d1fc7fd	119	{
5198080d	120	struct lttng_ust_lib_ring_buffer_channel *chan = shmp(handle, buf->backend.chan);
3d1fc7fd MD	121	struct metadata_packet_header *header =
	122	(struct metadata_packet_header *)
	123	lib_ring_buffer_offset_address(&buf->backend,
1d498196 MD	124	subbuf_idx * chan->backend.subbuf_size,
1d498196 MD	125	handle);
3d1fc7fd MD	126	unsigned long records_lost = 0;
3d1fc7fd MD	127
34daae3e MD	128	assert(header);
	129	if (!header)
	130	return;
3d1fc7fd	131	header->content_size = data_size * CHAR_BIT; /* in bits */
b72687b8	132	header->packet_size = LTTNG_UST_PAGE_ALIGN(data_size) * CHAR_BIT; /* in bits */
04489ab4 MD	133	/*
	134	* We do not care about the records lost count, because the metadata
	135	* channel waits and retry.
	136	*/
	137	(void) lib_ring_buffer_get_records_lost_full(&client_config, buf);
3d1fc7fd MD	138	records_lost += lib_ring_buffer_get_records_lost_wrap(&client_config, buf);
	139	records_lost += lib_ring_buffer_get_records_lost_big(&client_config, buf);
	140	WARN_ON_ONCE(records_lost != 0);
	141	}
	142
4cfec15c	143	static int client_buffer_create(struct lttng_ust_lib_ring_buffer buf, void priv,
1d498196	144	int cpu, const char *name,
38fae1d3	145	struct lttng_ust_shm_handle *handle)
3d1fc7fd MD	146	{
	147	return 0;
	148	}
	149
4cfec15c	150	static void client_buffer_finalize(struct lttng_ust_lib_ring_buffer *buf,
1d498196	151	void *priv, int cpu,
38fae1d3	152	struct lttng_ust_shm_handle *handle)
3d1fc7fd MD	153	{
	154	}
	155
82b9bde8 JD	156	static const
	157	struct lttng_ust_client_lib_ring_buffer_client_cb client_cb = {
	158	.parent = {
	159	.ring_buffer_clock_read = client_ring_buffer_clock_read,
	160	.record_header_size = client_record_header_size,
	161	.subbuffer_header_size = client_packet_header_size,
	162	.buffer_begin = client_buffer_begin,
	163	.buffer_end = client_buffer_end,
	164	.buffer_create = client_buffer_create,
	165	.buffer_finalize = client_buffer_finalize,
	166	},
	167	};
	168
4cfec15c	169	static const struct lttng_ust_lib_ring_buffer_config client_config = {
3d1fc7fd MD	170	.cb.ring_buffer_clock_read = client_ring_buffer_clock_read,
	171	.cb.record_header_size = client_record_header_size,
	172	.cb.subbuffer_header_size = client_packet_header_size,
	173	.cb.buffer_begin = client_buffer_begin,
	174	.cb.buffer_end = client_buffer_end,
	175	.cb.buffer_create = client_buffer_create,
	176	.cb.buffer_finalize = client_buffer_finalize,
	177
	178	.tsc_bits = 0,
	179	.alloc = RING_BUFFER_ALLOC_GLOBAL,
	180	.sync = RING_BUFFER_SYNC_GLOBAL,
	181	.mode = RING_BUFFER_MODE_TEMPLATE,
	182	.backend = RING_BUFFER_PAGE,
5d61a504	183	.output = RING_BUFFER_MMAP,
3d1fc7fd	184	.oops = RING_BUFFER_OOPS_CONSISTENCY,
5d61a504 MD	185	.ipi = RING_BUFFER_NO_IPI_BARRIER,
5d61a504 MD	186	.wakeup = RING_BUFFER_WAKEUP_BY_WRITER,
c1fca457	187	.client_type = LTTNG_CLIENT_TYPE,
82b9bde8 JD	188
82b9bde8 JD	189	.cb_ptr = &client_cb.parent,
3d1fc7fd MD	190	};
	191
	192	static
e7bc0ef6	193	struct lttng_ust_channel_buffer _channel_create(const char name,
a3f61e7f	194	void *buf_addr,
3d1fc7fd MD	195	size_t subbuf_size, size_t num_subbuf,
3d1fc7fd MD	196	unsigned int switch_timer_interval,
193183fb	197	unsigned int read_timer_interval,
6ca18e66	198	unsigned char *uuid,
a9ff648c	199	uint32_t chan_id,
b2c5f61a MD	200	const int *stream_fds, int nr_stream_fds,
b2c5f61a MD	201	int64_t blocking_timeout)
3d1fc7fd	202	{
f0fde1c3	203	struct lttng_ust_abi_channel_config chan_priv_init;
a3f61e7f	204	struct lttng_ust_shm_handle *handle;
e7bc0ef6	205	struct lttng_ust_channel_buffer *lttng_chan_buf;
f0fde1c3	206
e7bc0ef6 MD	207	lttng_chan_buf = lttng_ust_alloc_channel_buffer();
e7bc0ef6 MD	208	if (!lttng_chan_buf)
f0fde1c3	209	return NULL;
e7bc0ef6 MD	210	memcpy(lttng_chan_buf->priv->uuid, uuid, LTTNG_UST_UUID_LEN);
e7bc0ef6 MD	211	lttng_chan_buf->priv->id = chan_id;
a3f61e7f	212
74d81a6c MD	213	memset(&chan_priv_init, 0, sizeof(chan_priv_init));
74d81a6c MD	214	memcpy(chan_priv_init.uuid, uuid, LTTNG_UST_UUID_LEN);
6ca18e66	215	chan_priv_init.id = chan_id;
f0fde1c3	216
a3f61e7f	217	handle = channel_create(&client_config, name,
e7bc0ef6 MD	218	__alignof__(struct lttng_ust_channel_buffer),
e7bc0ef6 MD	219	sizeof(struct lttng_ust_channel_buffer),
74d81a6c	220	&chan_priv_init,
e7bc0ef6	221	lttng_chan_buf, buf_addr, subbuf_size, num_subbuf,
a9ff648c	222	switch_timer_interval, read_timer_interval,
b2c5f61a	223	stream_fds, nr_stream_fds, blocking_timeout);
a3f61e7f	224	if (!handle)
f0fde1c3	225	goto error;
e7bc0ef6 MD	226	lttng_chan_buf->handle = handle;
	227	lttng_chan_buf->chan = shmp(handle, handle->chan);
	228	return lttng_chan_buf;
f0fde1c3 MD	229
f0fde1c3 MD	230	error:
e7bc0ef6	231	lttng_ust_free_channel_common(lttng_chan_buf->parent);
f0fde1c3	232	return NULL;
3d1fc7fd MD	233	}
	234
	235	static
e7bc0ef6	236	void lttng_channel_destroy(struct lttng_ust_channel_buffer *lttng_chan_buf)
3d1fc7fd	237	{
e7bc0ef6 MD	238	channel_destroy(lttng_chan_buf->chan, lttng_chan_buf->handle, 1);
e7bc0ef6 MD	239	lttng_ust_free_channel_common(lttng_chan_buf->parent);
3d1fc7fd MD	240	}
	241
	242	static
7dd08bec	243	int lttng_event_reserve(struct lttng_ust_lib_ring_buffer_ctx *ctx, uint32_t event_id)
3d1fc7fd	244	{
a3492932 MD	245	int ret;
a3492932 MD	246
e56bb47c	247	ret = lib_ring_buffer_reserve(&client_config, ctx, NULL);
a3492932 MD	248	if (ret)
a3492932 MD	249	return ret;
2b7080aa MD	250	if (lib_ring_buffer_backend_get_pages(&client_config, ctx,
	251	&ctx->backend_pages))
	252	return -EPERM;
a3492932	253	return 0;
3d1fc7fd MD	254	}
	255
	256	static
7dd08bec	257	void lttng_event_commit(struct lttng_ust_lib_ring_buffer_ctx *ctx)
3d1fc7fd MD	258	{
	259	lib_ring_buffer_commit(&client_config, ctx);
	260	}
	261
	262	static
7dd08bec	263	void lttng_event_write(struct lttng_ust_lib_ring_buffer_ctx ctx, const void src,
3d1fc7fd MD	264	size_t len)
	265	{
	266	lib_ring_buffer_write(&client_config, ctx, src, len);
	267	}
	268
	269	static
5198080d MJ	270	size_t lttng_packet_avail_size(struct lttng_ust_lib_ring_buffer_channel *chan,
5198080d MJ	271	struct lttng_ust_shm_handle *handle)
3d1fc7fd MD	272	{
3d1fc7fd MD	273	unsigned long o_begin;
4cfec15c	274	struct lttng_ust_lib_ring_buffer *buf;
3d1fc7fd	275
1d498196	276	buf = shmp(handle, chan->backend.buf[0].shmp); /* Only for global buffer ! */
3d1fc7fd MD	277	o_begin = v_read(&client_config, &buf->offset);
	278	if (subbuf_offset(o_begin, chan) != 0) {
	279	return chan->backend.subbuf_size - subbuf_offset(o_begin, chan);
	280	} else {
	281	return chan->backend.subbuf_size - subbuf_offset(o_begin, chan)
	282	- sizeof(struct metadata_packet_header);
	283	}
	284	}
	285
9f3fdbc6	286	#if 0
3d1fc7fd	287	static
5198080d	288	wait_queue_head_t lttng_get_reader_wait_queue(struct lttng_ust_lib_ring_buffer_channel chan)
3d1fc7fd MD	289	{
	290	return &chan->read_wait;
	291	}
	292
	293	static
5198080d	294	wait_queue_head_t lttng_get_hp_wait_queue(struct lttng_ust_lib_ring_buffer_channel chan)
3d1fc7fd MD	295	{
	296	return &chan->hp_wait;
	297	}
9f3fdbc6	298	#endif //0
3d1fc7fd MD	299
3d1fc7fd MD	300	static
5198080d	301	int lttng_is_finalized(struct lttng_ust_lib_ring_buffer_channel *chan)
3d1fc7fd MD	302	{
	303	return lib_ring_buffer_channel_is_finalized(chan);
	304	}
	305
	306	static
5198080d	307	int lttng_is_disabled(struct lttng_ust_lib_ring_buffer_channel *chan)
3d1fc7fd MD	308	{
	309	return lib_ring_buffer_channel_is_disabled(chan);
	310	}
	311
43861eab	312	static
5198080d MJ	313	int lttng_flush_buffer(struct lttng_ust_lib_ring_buffer_channel *chan,
5198080d MJ	314	struct lttng_ust_shm_handle *handle)
43861eab	315	{
4cfec15c	316	struct lttng_ust_lib_ring_buffer *buf;
74d81a6c MD	317	int shm_fd, wait_fd, wakeup_fd;
74d81a6c MD	318	uint64_t memory_map_size;
43861eab MD	319
43861eab MD	320	buf = channel_get_ring_buffer(&client_config, chan,
74d81a6c	321	0, handle, &shm_fd, &wait_fd, &wakeup_fd,
43861eab MD	322	&memory_map_size);
	323	lib_ring_buffer_switch(&client_config, buf,
	324	SWITCH_ACTIVE, handle);
	325	return 0;
	326	}
	327
7dd08bec	328	static struct lttng_transport lttng_relay_transport = {
818173b9	329	.name = "relay-" RING_BUFFER_MODE_TEMPLATE_STRING "-mmap",
3d1fc7fd	330	.ops = {
49926dbd MD	331	.struct_size = sizeof(struct lttng_ust_channel_ops),
49926dbd MD	332
a880bae5 MD	333	.priv = __LTTNG_COMPOUND_LITERAL(struct lttng_ust_channel_ops_private, {
	334	.pub = &lttng_relay_transport.ops,
	335	.channel_create = _channel_create,
	336	.channel_destroy = lttng_channel_destroy,
	337	.packet_avail_size = lttng_packet_avail_size,
	338	.is_finalized = lttng_is_finalized,
	339	.is_disabled = lttng_is_disabled,
	340	.flush_buffer = lttng_flush_buffer,
	341	}),
7dd08bec MD	342	.event_reserve = lttng_event_reserve,
	343	.event_commit = lttng_event_commit,
	344	.event_write = lttng_event_write,
3d1fc7fd	345	},
74d81a6c	346	.client_config = &client_config,
3d1fc7fd MD	347	};
3d1fc7fd MD	348
edaa1431	349	void RING_BUFFER_MODE_TEMPLATE_INIT(void)
3d1fc7fd	350	{
34a91bdb MD	351	DBG("LTT : ltt ring buffer client \"%s\" init\n",
34a91bdb MD	352	"relay-" RING_BUFFER_MODE_TEMPLATE_STRING "-mmap");
7dd08bec	353	lttng_transport_register(&lttng_relay_transport);
3d1fc7fd MD	354	}
3d1fc7fd MD	355
edaa1431	356	void RING_BUFFER_MODE_TEMPLATE_EXIT(void)
3d1fc7fd	357	{
34a91bdb MD	358	DBG("LTT : ltt ring buffer client \"%s\" exit\n",
34a91bdb MD	359	"relay-" RING_BUFFER_MODE_TEMPLATE_STRING "-mmap");
7dd08bec	360	lttng_transport_unregister(&lttng_relay_transport);
3d1fc7fd	361	}