[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 shm_handle *handle)
{
	struct 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 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 shm_handle *handle)
{
	struct 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;

	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,
				struct shm_handle *handle)
{
	return 0;
}

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

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_MMAP,
	.oops = RING_BUFFER_OOPS_CONSISTENCY,
	.ipi = RING_BUFFER_NO_IPI_BARRIER,
	.wakeup = RING_BUFFER_WAKEUP_BY_WRITER,
};

static
struct ltt_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)
{
	ltt_chan->handle = channel_create(&client_config, name, ltt_chan, buf_addr,
			      subbuf_size, num_subbuf, switch_timer_interval,
			      read_timer_interval);
	if (!ltt_chan->handle)
		return NULL;
	ltt_chan->chan = shmp(ltt_chan->handle, ltt_chan->handle->chan);
	return ltt_chan;
}

static
void ltt_channel_destroy(struct ltt_channel *ltt_chan)
{
	channel_destroy(ltt_chan->chan, ltt_chan->handle);
}

static
struct lib_ring_buffer *ltt_buffer_read_open(struct channel *chan,
					     struct shm_handle *handle)
{
	struct lib_ring_buffer *buf;

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

static
void ltt_buffer_read_close(struct lib_ring_buffer *buf,
			   struct shm_handle *handle)
{
	lib_ring_buffer_release_read(buf, handle);
}

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, struct shm_handle *handle)
			     
{
	unsigned long o_begin;
	struct 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 *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 "-mmap",
	.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)
{
	DBG("LTT : ltt ring buffer client init\n");
	ltt_transport_register(&ltt_relay_transport);
}

static
void __attribute__((destructor)) ltt_ring_buffer_client_exit(void)
{
	DBG("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,
1d498196 MD	79	unsigned int subbuf_idx,
1d498196 MD	80	struct shm_handle *handle)
3d1fc7fd	81	{
1d498196	82	struct channel *chan = shmp(handle, buf->backend.chan);
3d1fc7fd MD	83	struct metadata_packet_header *header =
	84	(struct metadata_packet_header *)
	85	lib_ring_buffer_offset_address(&buf->backend,
1d498196 MD	86	subbuf_idx * chan->backend.subbuf_size,
1d498196 MD	87	handle);
3d1fc7fd MD	88	struct ltt_channel *ltt_chan = channel_get_private(chan);
	89	struct ltt_session *session = ltt_chan->session;
	90
	91	header->magic = TSDL_MAGIC_NUMBER;
9f3fdbc6	92	memcpy(header->uuid, session->uuid, sizeof(session->uuid));
3d1fc7fd MD	93	header->checksum = 0; /* 0 if unused */
	94	header->content_size = 0xFFFFFFFF; /* in bits, for debugging */
	95	header->packet_size = 0xFFFFFFFF; /* in bits, for debugging */
	96	header->compression_scheme = 0; /* 0 if unused */
	97	header->encryption_scheme = 0; /* 0 if unused */
	98	header->checksum_scheme = 0; /* 0 if unused */
	99	}
	100
	101	/*
	102	* offset is assumed to never be 0 here : never deliver a completely empty
	103	* subbuffer. data_size is between 1 and subbuf_size.
	104	*/
	105	static void client_buffer_end(struct lib_ring_buffer *buf, u64 tsc,
1d498196 MD	106	unsigned int subbuf_idx, unsigned long data_size,
1d498196 MD	107	struct shm_handle *handle)
3d1fc7fd	108	{
1d498196	109	struct channel *chan = shmp(handle, buf->backend.chan);
3d1fc7fd MD	110	struct metadata_packet_header *header =
	111	(struct metadata_packet_header *)
	112	lib_ring_buffer_offset_address(&buf->backend,
1d498196 MD	113	subbuf_idx * chan->backend.subbuf_size,
1d498196 MD	114	handle);
3d1fc7fd MD	115	unsigned long records_lost = 0;
	116
	117	header->content_size = data_size * CHAR_BIT; /* in bits */
	118	header->packet_size = PAGE_ALIGN(data_size) * CHAR_BIT; /* in bits */
	119	records_lost += lib_ring_buffer_get_records_lost_full(&client_config, buf);
	120	records_lost += lib_ring_buffer_get_records_lost_wrap(&client_config, buf);
	121	records_lost += lib_ring_buffer_get_records_lost_big(&client_config, buf);
	122	WARN_ON_ONCE(records_lost != 0);
	123	}
	124
	125	static int client_buffer_create(struct lib_ring_buffer buf, void priv,
1d498196 MD	126	int cpu, const char *name,
1d498196 MD	127	struct shm_handle *handle)
3d1fc7fd MD	128	{
	129	return 0;
	130	}
	131
1d498196 MD	132	static void client_buffer_finalize(struct lib_ring_buffer *buf,
	133	void *priv, int cpu,
	134	struct shm_handle *handle)
3d1fc7fd MD	135	{
	136	}
	137
	138	static const struct lib_ring_buffer_config client_config = {
	139	.cb.ring_buffer_clock_read = client_ring_buffer_clock_read,
	140	.cb.record_header_size = client_record_header_size,
	141	.cb.subbuffer_header_size = client_packet_header_size,
	142	.cb.buffer_begin = client_buffer_begin,
	143	.cb.buffer_end = client_buffer_end,
	144	.cb.buffer_create = client_buffer_create,
	145	.cb.buffer_finalize = client_buffer_finalize,
	146
	147	.tsc_bits = 0,
	148	.alloc = RING_BUFFER_ALLOC_GLOBAL,
	149	.sync = RING_BUFFER_SYNC_GLOBAL,
	150	.mode = RING_BUFFER_MODE_TEMPLATE,
	151	.backend = RING_BUFFER_PAGE,
5d61a504	152	.output = RING_BUFFER_MMAP,
3d1fc7fd	153	.oops = RING_BUFFER_OOPS_CONSISTENCY,
5d61a504 MD	154	.ipi = RING_BUFFER_NO_IPI_BARRIER,
5d61a504 MD	155	.wakeup = RING_BUFFER_WAKEUP_BY_WRITER,
3d1fc7fd MD	156	};
	157
	158	static
1d498196	159	struct ltt_channel _channel_create(const char name,
3d1fc7fd MD	160	struct ltt_channel ltt_chan, void buf_addr,
	161	size_t subbuf_size, size_t num_subbuf,
	162	unsigned int switch_timer_interval,
8d8a24c8	163	unsigned int read_timer_interval)
3d1fc7fd	164	{
1d498196	165	ltt_chan->handle = channel_create(&client_config, name, ltt_chan, buf_addr,
3d1fc7fd	166	subbuf_size, num_subbuf, switch_timer_interval,
8d8a24c8	167	read_timer_interval);
1b2c2540 MD	168	if (!ltt_chan->handle)
	169	return NULL;
	170	ltt_chan->chan = shmp(ltt_chan->handle, ltt_chan->handle->chan);
1d498196	171	return ltt_chan;
3d1fc7fd MD	172	}
	173
	174	static
1d498196	175	void ltt_channel_destroy(struct ltt_channel *ltt_chan)
3d1fc7fd	176	{
1d498196	177	channel_destroy(ltt_chan->chan, ltt_chan->handle);
3d1fc7fd MD	178	}
	179
	180	static
1d498196 MD	181	struct lib_ring_buffer ltt_buffer_read_open(struct channel chan,
1d498196 MD	182	struct shm_handle *handle)
3d1fc7fd MD	183	{
	184	struct lib_ring_buffer *buf;
	185
1d498196 MD	186	buf = channel_get_ring_buffer(&client_config, chan, 0, handle);
1d498196 MD	187	if (!lib_ring_buffer_open_read(buf, handle))
3d1fc7fd MD	188	return buf;
	189	return NULL;
	190	}
	191
	192	static
1d498196 MD	193	void ltt_buffer_read_close(struct lib_ring_buffer *buf,
1d498196 MD	194	struct shm_handle *handle)
3d1fc7fd	195	{
1d498196	196	lib_ring_buffer_release_read(buf, handle);
3d1fc7fd MD	197	}
	198
	199	static
	200	int ltt_event_reserve(struct lib_ring_buffer_ctx *ctx, uint32_t event_id)
	201	{
	202	return lib_ring_buffer_reserve(&client_config, ctx);
	203	}
	204
	205	static
	206	void ltt_event_commit(struct lib_ring_buffer_ctx *ctx)
	207	{
	208	lib_ring_buffer_commit(&client_config, ctx);
	209	}
	210
	211	static
	212	void ltt_event_write(struct lib_ring_buffer_ctx ctx, const void src,
	213	size_t len)
	214	{
	215	lib_ring_buffer_write(&client_config, ctx, src, len);
	216	}
	217
	218	static
1d498196	219	size_t ltt_packet_avail_size(struct channel chan, struct shm_handle handle)
3d1fc7fd MD	220
	221	{
	222	unsigned long o_begin;
	223	struct lib_ring_buffer *buf;
	224
1d498196	225	buf = shmp(handle, chan->backend.buf[0].shmp); /* Only for global buffer ! */
3d1fc7fd MD	226	o_begin = v_read(&client_config, &buf->offset);
	227	if (subbuf_offset(o_begin, chan) != 0) {
	228	return chan->backend.subbuf_size - subbuf_offset(o_begin, chan);
	229	} else {
	230	return chan->backend.subbuf_size - subbuf_offset(o_begin, chan)
	231	- sizeof(struct metadata_packet_header);
	232	}
	233	}
	234
9f3fdbc6	235	#if 0
3d1fc7fd MD	236	static
	237	wait_queue_head_t ltt_get_reader_wait_queue(struct channel chan)
	238	{
	239	return &chan->read_wait;
	240	}
	241
	242	static
	243	wait_queue_head_t ltt_get_hp_wait_queue(struct channel chan)
	244	{
	245	return &chan->hp_wait;
	246	}
9f3fdbc6	247	#endif //0
3d1fc7fd MD	248
	249	static
	250	int ltt_is_finalized(struct channel *chan)
	251	{
	252	return lib_ring_buffer_channel_is_finalized(chan);
	253	}
	254
	255	static
	256	int ltt_is_disabled(struct channel *chan)
	257	{
	258	return lib_ring_buffer_channel_is_disabled(chan);
	259	}
	260
	261	static struct ltt_transport ltt_relay_transport = {
818173b9	262	.name = "relay-" RING_BUFFER_MODE_TEMPLATE_STRING "-mmap",
3d1fc7fd MD	263	.ops = {
	264	.channel_create = _channel_create,
	265	.channel_destroy = ltt_channel_destroy,
	266	.buffer_read_open = ltt_buffer_read_open,
	267	.buffer_read_close = ltt_buffer_read_close,
	268	.event_reserve = ltt_event_reserve,
	269	.event_commit = ltt_event_commit,
	270	.event_write = ltt_event_write,
	271	.packet_avail_size = ltt_packet_avail_size,
9f3fdbc6 MD	272	//.get_reader_wait_queue = ltt_get_reader_wait_queue,
9f3fdbc6 MD	273	//.get_hp_wait_queue = ltt_get_hp_wait_queue,
3d1fc7fd MD	274	.is_finalized = ltt_is_finalized,
	275	.is_disabled = ltt_is_disabled,
	276	},
	277	};
	278
9f3fdbc6 MD	279	static
9f3fdbc6 MD	280	void __attribute__((constructor)) ltt_ring_buffer_client_init(void)
3d1fc7fd	281	{
18c1cd87	282	DBG("LTT : ltt ring buffer client init\n");
3d1fc7fd	283	ltt_transport_register(&ltt_relay_transport);
3d1fc7fd MD	284	}
3d1fc7fd MD	285
9f3fdbc6 MD	286	static
9f3fdbc6 MD	287	void __attribute__((destructor)) ltt_ring_buffer_client_exit(void)
3d1fc7fd	288	{
18c1cd87	289	DBG("LTT : ltt ring buffer client exit\n");
3d1fc7fd MD	290	ltt_transport_unregister(&ltt_relay_transport);
3d1fc7fd MD	291	}