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

/*
 * ltt-ring-buffer-client.h
 *
 * Copyright (C) 2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * LTTng lib ring buffer client template.
 *
 * Dual LGPL v2.1/GPL v2 license.
 */

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

struct metadata_packet_header {
	uint32_t magic;			/* 0x75D11D57 */
	uint8_t  uuid[16];		/* 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  header_end[0];
};

struct metadata_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
unsigned char 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)
{
	return 0;
}

#include "../libringbuffer/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)
{
	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 lib_ring_buffer *buf, u64 tsc,
				unsigned int subbuf_idx)
{
	struct channel *chan = shmp(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);
	struct ltt_channel *ltt_chan = channel_get_private(chan);
	struct ltt_session *session = ltt_chan->session;

	header->magic = TSDL_MAGIC_NUMBER;
	memcpy(header->uuid, session->uuid, sizeof(session->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 */
}

/*
 * 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)
{
	struct channel *chan = shmp(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);
	unsigned long records_lost = 0;

	header->content_size = data_size * CHAR_BIT;		/* in bits */
	header->packet_size = PAGE_ALIGN(data_size) * CHAR_BIT; /* in bits */
	records_lost += 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 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 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,

	.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_SPLICE,
	.oops = RING_BUFFER_OOPS_CONSISTENCY,
	.ipi = RING_BUFFER_IPI_BARRIER,
	.wakeup = RING_BUFFER_WAKEUP_BY_TIMER,
};

static
struct shm_handle *_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)
{
	return channel_create(&client_config, name, ltt_chan, buf_addr,
			      subbuf_size, num_subbuf, switch_timer_interval,
			      read_timer_interval);
}

static
void ltt_channel_destroy(struct shm_handle *handle)
{
	channel_destroy(handle);
}

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

static
int ltt_event_reserve(struct lib_ring_buffer_ctx *ctx, uint32_t event_id)
{
	return lib_ring_buffer_reserve(&client_config, ctx);
}

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

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

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

	buf = shmp(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 metadata_packet_header);
	}
}

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

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

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

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

static struct ltt_transport ltt_relay_transport = {
	.name = "relay-" RING_BUFFER_MODE_TEMPLATE_STRING,
	.ops = {
		.channel_create = _channel_create,
		.channel_destroy = ltt_channel_destroy,
		.buffer_read_open = ltt_buffer_read_open,
		.buffer_read_close = ltt_buffer_read_close,
		.event_reserve = ltt_event_reserve,
		.event_commit = ltt_event_commit,
		.event_write = ltt_event_write,
		.packet_avail_size = ltt_packet_avail_size,
		//.get_reader_wait_queue = ltt_get_reader_wait_queue,
		//.get_hp_wait_queue = ltt_get_hp_wait_queue,
		.is_finalized = ltt_is_finalized,
		.is_disabled = ltt_is_disabled,
	},
};

static
void __attribute__((constructor)) ltt_ring_buffer_client_init(void)
{
	printf("LTT : ltt ring buffer client init\n");
	ltt_transport_register(&ltt_relay_transport);
}

static
void __attribute__((destructor)) ltt_ring_buffer_client_exit(void)
{
	printf("LTT : ltt ring buffer client exit\n");
	ltt_transport_unregister(&ltt_relay_transport);
}
Commit	Line	Data
3d1fc7fd MD	1	/*
	2	* ltt-ring-buffer-client.h
	3	*
	4	* Copyright (C) 2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	5	*
	6	* LTTng lib ring buffer client template.
	7	*
	8	* Dual LGPL v2.1/GPL v2 license.
	9	*/
	10
9f3fdbc6	11	#include <stdint.h>
f4681817	12	#include <ust/lttng-events.h>
9f3fdbc6	13	#include "ust/bitfield.h"
3d1fc7fd	14	#include "ltt-tracer.h"
9f3fdbc6	15	#include "../libringbuffer/frontend_types.h"
3d1fc7fd MD	16
	17	struct metadata_packet_header {
	18	uint32_t magic; /* 0x75D11D57 */
	19	uint8_t uuid[16]; /* Unique Universal Identifier */
	20	uint32_t checksum; /* 0 if unused */
	21	uint32_t content_size; /* in bits */
	22	uint32_t packet_size; /* in bits */
	23	uint8_t compression_scheme; /* 0 if unused */
	24	uint8_t encryption_scheme; /* 0 if unused */
	25	uint8_t checksum_scheme; /* 0 if unused */
	26	uint8_t header_end[0];
	27	};
	28
	29	struct metadata_record_header {
	30	uint8_t header_end[0]; /* End of header */
	31	};
	32
	33	static const struct lib_ring_buffer_config client_config;
	34
	35	static inline
	36	u64 lib_ring_buffer_clock_read(struct channel *chan)
	37	{
	38	return 0;
	39	}
	40
	41	static inline
	42	unsigned char record_header_size(const struct lib_ring_buffer_config *config,
	43	struct channel *chan, size_t offset,
	44	size_t *pre_header_padding,
	45	struct lib_ring_buffer_ctx *ctx)
	46	{
	47	return 0;
	48	}
	49
9f3fdbc6	50	#include "../libringbuffer/api.h"
3d1fc7fd MD	51
	52	static u64 client_ring_buffer_clock_read(struct channel *chan)
	53	{
	54	return 0;
	55	}
	56
	57	static
	58	size_t client_record_header_size(const struct lib_ring_buffer_config *config,
	59	struct channel *chan, size_t offset,
	60	size_t *pre_header_padding,
	61	struct lib_ring_buffer_ctx *ctx)
	62	{
	63	return 0;
	64	}
	65
	66	/**
	67	* client_packet_header_size - called on buffer-switch to a new sub-buffer
	68	*
	69	* Return header size without padding after the structure. Don't use packed
	70	* structure because gcc generates inefficient code on some architectures
	71	* (powerpc, mips..)
	72	*/
	73	static size_t client_packet_header_size(void)
	74	{
	75	return offsetof(struct metadata_packet_header, header_end);
	76	}
	77
	78	static void client_buffer_begin(struct lib_ring_buffer *buf, u64 tsc,
	79	unsigned int subbuf_idx)
	80	{
9f3fdbc6	81	struct channel *chan = shmp(buf->backend.chan);
3d1fc7fd MD	82	struct metadata_packet_header *header =
	83	(struct metadata_packet_header *)
	84	lib_ring_buffer_offset_address(&buf->backend,
	85	subbuf_idx * chan->backend.subbuf_size);
	86	struct ltt_channel *ltt_chan = channel_get_private(chan);
	87	struct ltt_session *session = ltt_chan->session;
	88
	89	header->magic = TSDL_MAGIC_NUMBER;
9f3fdbc6	90	memcpy(header->uuid, session->uuid, sizeof(session->uuid));
3d1fc7fd MD	91	header->checksum = 0; /* 0 if unused */
	92	header->content_size = 0xFFFFFFFF; /* in bits, for debugging */
	93	header->packet_size = 0xFFFFFFFF; /* in bits, for debugging */
	94	header->compression_scheme = 0; /* 0 if unused */
	95	header->encryption_scheme = 0; /* 0 if unused */
	96	header->checksum_scheme = 0; /* 0 if unused */
	97	}
	98
	99	/*
	100	* offset is assumed to never be 0 here : never deliver a completely empty
	101	* subbuffer. data_size is between 1 and subbuf_size.
	102	*/
	103	static void client_buffer_end(struct lib_ring_buffer *buf, u64 tsc,
	104	unsigned int subbuf_idx, unsigned long data_size)
	105	{
9f3fdbc6	106	struct channel *chan = shmp(buf->backend.chan);
3d1fc7fd MD	107	struct metadata_packet_header *header =
	108	(struct metadata_packet_header *)
	109	lib_ring_buffer_offset_address(&buf->backend,
	110	subbuf_idx * chan->backend.subbuf_size);
	111	unsigned long records_lost = 0;
	112
	113	header->content_size = data_size * CHAR_BIT; /* in bits */
	114	header->packet_size = PAGE_ALIGN(data_size) * CHAR_BIT; /* in bits */
	115	records_lost += lib_ring_buffer_get_records_lost_full(&client_config, buf);
	116	records_lost += lib_ring_buffer_get_records_lost_wrap(&client_config, buf);
	117	records_lost += lib_ring_buffer_get_records_lost_big(&client_config, buf);
	118	WARN_ON_ONCE(records_lost != 0);
	119	}
	120
	121	static int client_buffer_create(struct lib_ring_buffer buf, void priv,
	122	int cpu, const char *name)
	123	{
	124	return 0;
	125	}
	126
	127	static void client_buffer_finalize(struct lib_ring_buffer buf, void priv, int cpu)
	128	{
	129	}
	130
	131	static const struct lib_ring_buffer_config client_config = {
	132	.cb.ring_buffer_clock_read = client_ring_buffer_clock_read,
	133	.cb.record_header_size = client_record_header_size,
	134	.cb.subbuffer_header_size = client_packet_header_size,
	135	.cb.buffer_begin = client_buffer_begin,
	136	.cb.buffer_end = client_buffer_end,
	137	.cb.buffer_create = client_buffer_create,
	138	.cb.buffer_finalize = client_buffer_finalize,
	139
	140	.tsc_bits = 0,
	141	.alloc = RING_BUFFER_ALLOC_GLOBAL,
	142	.sync = RING_BUFFER_SYNC_GLOBAL,
	143	.mode = RING_BUFFER_MODE_TEMPLATE,
	144	.backend = RING_BUFFER_PAGE,
	145	.output = RING_BUFFER_SPLICE,
	146	.oops = RING_BUFFER_OOPS_CONSISTENCY,
	147	.ipi = RING_BUFFER_IPI_BARRIER,
	148	.wakeup = RING_BUFFER_WAKEUP_BY_TIMER,
	149	};
	150
	151	static
8d8a24c8	152	struct shm_handle _channel_create(const char name,
3d1fc7fd MD	153	struct ltt_channel ltt_chan, void buf_addr,
	154	size_t subbuf_size, size_t num_subbuf,
	155	unsigned int switch_timer_interval,
8d8a24c8	156	unsigned int read_timer_interval)
3d1fc7fd MD	157	{
	158	return channel_create(&client_config, name, ltt_chan, buf_addr,
	159	subbuf_size, num_subbuf, switch_timer_interval,
8d8a24c8	160	read_timer_interval);
3d1fc7fd MD	161	}
	162
	163	static
8d8a24c8	164	void ltt_channel_destroy(struct shm_handle *handle)
3d1fc7fd	165	{
8d8a24c8	166	channel_destroy(handle);
3d1fc7fd MD	167	}
	168
	169	static
	170	struct lib_ring_buffer ltt_buffer_read_open(struct channel chan)
	171	{
	172	struct lib_ring_buffer *buf;
	173
	174	buf = channel_get_ring_buffer(&client_config, chan, 0);
	175	if (!lib_ring_buffer_open_read(buf))
	176	return buf;
	177	return NULL;
	178	}
	179
	180	static
	181	void ltt_buffer_read_close(struct lib_ring_buffer *buf)
	182	{
	183	lib_ring_buffer_release_read(buf);
	184	}
	185
	186	static
	187	int ltt_event_reserve(struct lib_ring_buffer_ctx *ctx, uint32_t event_id)
	188	{
	189	return lib_ring_buffer_reserve(&client_config, ctx);
	190	}
	191
	192	static
	193	void ltt_event_commit(struct lib_ring_buffer_ctx *ctx)
	194	{
	195	lib_ring_buffer_commit(&client_config, ctx);
	196	}
	197
	198	static
	199	void ltt_event_write(struct lib_ring_buffer_ctx ctx, const void src,
	200	size_t len)
	201	{
	202	lib_ring_buffer_write(&client_config, ctx, src, len);
	203	}
	204
	205	static
	206	size_t ltt_packet_avail_size(struct channel *chan)
	207
	208	{
	209	unsigned long o_begin;
	210	struct lib_ring_buffer *buf;
	211
9f3fdbc6	212	buf = shmp(chan->backend.buf); /* Only for global buffer ! */
3d1fc7fd MD	213	o_begin = v_read(&client_config, &buf->offset);
	214	if (subbuf_offset(o_begin, chan) != 0) {
	215	return chan->backend.subbuf_size - subbuf_offset(o_begin, chan);
	216	} else {
	217	return chan->backend.subbuf_size - subbuf_offset(o_begin, chan)
	218	- sizeof(struct metadata_packet_header);
	219	}
	220	}
	221
9f3fdbc6	222	#if 0
3d1fc7fd MD	223	static
	224	wait_queue_head_t ltt_get_reader_wait_queue(struct channel chan)
	225	{
	226	return &chan->read_wait;
	227	}
	228
	229	static
	230	wait_queue_head_t ltt_get_hp_wait_queue(struct channel chan)
	231	{
	232	return &chan->hp_wait;
	233	}
9f3fdbc6	234	#endif //0
3d1fc7fd MD	235
	236	static
	237	int ltt_is_finalized(struct channel *chan)
	238	{
	239	return lib_ring_buffer_channel_is_finalized(chan);
	240	}
	241
	242	static
	243	int ltt_is_disabled(struct channel *chan)
	244	{
	245	return lib_ring_buffer_channel_is_disabled(chan);
	246	}
	247
	248	static struct ltt_transport ltt_relay_transport = {
	249	.name = "relay-" RING_BUFFER_MODE_TEMPLATE_STRING,
3d1fc7fd MD	250	.ops = {
	251	.channel_create = _channel_create,
	252	.channel_destroy = ltt_channel_destroy,
	253	.buffer_read_open = ltt_buffer_read_open,
	254	.buffer_read_close = ltt_buffer_read_close,
	255	.event_reserve = ltt_event_reserve,
	256	.event_commit = ltt_event_commit,
	257	.event_write = ltt_event_write,
	258	.packet_avail_size = ltt_packet_avail_size,
9f3fdbc6 MD	259	//.get_reader_wait_queue = ltt_get_reader_wait_queue,
9f3fdbc6 MD	260	//.get_hp_wait_queue = ltt_get_hp_wait_queue,
3d1fc7fd MD	261	.is_finalized = ltt_is_finalized,
	262	.is_disabled = ltt_is_disabled,
	263	},
	264	};
	265
9f3fdbc6 MD	266	static
9f3fdbc6 MD	267	void __attribute__((constructor)) ltt_ring_buffer_client_init(void)
3d1fc7fd	268	{
9f3fdbc6	269	printf("LTT : ltt ring buffer client init\n");
3d1fc7fd	270	ltt_transport_register(&ltt_relay_transport);
3d1fc7fd MD	271	}
3d1fc7fd MD	272
9f3fdbc6 MD	273	static
9f3fdbc6 MD	274	void __attribute__((destructor)) ltt_ring_buffer_client_exit(void)
3d1fc7fd	275	{
9f3fdbc6	276	printf("LTT : ltt ring buffer client exit\n");
3d1fc7fd MD	277	ltt_transport_unregister(&ltt_relay_transport);
3d1fc7fd MD	278	}