From 3d1fc7fd48d566eeb6e248de477995b789b094c7 Mon Sep 17 00:00:00 2001 From: Mathieu Desnoyers Date: Thu, 16 Jun 2011 15:38:22 -0400 Subject: [PATCH] Initial addition of lttng ring buffer clients Signed-off-by: Mathieu Desnoyers --- libust/ltt-ring-buffer-client-discard.c | 20 + libust/ltt-ring-buffer-client-overwrite.c | 20 + libust/ltt-ring-buffer-client.h | 525 ++++++++++++++++++++++ libust/ltt-ring-buffer-metadata-client.c | 20 + libust/ltt-ring-buffer-metadata-client.h | 290 ++++++++++++ 5 files changed, 875 insertions(+) create mode 100644 libust/ltt-ring-buffer-client-discard.c create mode 100644 libust/ltt-ring-buffer-client-overwrite.c create mode 100644 libust/ltt-ring-buffer-client.h create mode 100644 libust/ltt-ring-buffer-metadata-client.c create mode 100644 libust/ltt-ring-buffer-metadata-client.h diff --git a/libust/ltt-ring-buffer-client-discard.c b/libust/ltt-ring-buffer-client-discard.c new file mode 100644 index 00000000..ca7dfa8e --- /dev/null +++ b/libust/ltt-ring-buffer-client-discard.c @@ -0,0 +1,20 @@ +/* + * ltt-ring-buffer-client-discard.c + * + * Copyright (C) 2010 - Mathieu Desnoyers + * + * LTTng lib ring buffer client (discard mode). + * + * Dual LGPL v2.1/GPL v2 license. + */ + +#include +#include "ltt-tracer.h" + +#define RING_BUFFER_MODE_TEMPLATE RING_BUFFER_DISCARD +#define RING_BUFFER_MODE_TEMPLATE_STRING "discard" +#include "ltt-ring-buffer-client.h" + +MODULE_LICENSE("GPL and additional rights"); +MODULE_AUTHOR("Mathieu Desnoyers"); +MODULE_DESCRIPTION("LTTng Ring Buffer Client Discard Mode"); diff --git a/libust/ltt-ring-buffer-client-overwrite.c b/libust/ltt-ring-buffer-client-overwrite.c new file mode 100644 index 00000000..ec3b1cf3 --- /dev/null +++ b/libust/ltt-ring-buffer-client-overwrite.c @@ -0,0 +1,20 @@ +/* + * ltt-ring-buffer-client-overwrite.c + * + * Copyright (C) 2010 - Mathieu Desnoyers + * + * LTTng lib ring buffer client (overwrite mode). + * + * Dual LGPL v2.1/GPL v2 license. + */ + +#include +#include "ltt-tracer.h" + +#define RING_BUFFER_MODE_TEMPLATE RING_BUFFER_OVERWRITE +#define RING_BUFFER_MODE_TEMPLATE_STRING "overwrite" +#include "ltt-ring-buffer-client.h" + +MODULE_LICENSE("GPL and additional rights"); +MODULE_AUTHOR("Mathieu Desnoyers"); +MODULE_DESCRIPTION("LTTng Ring Buffer Client Overwrite Mode"); diff --git a/libust/ltt-ring-buffer-client.h b/libust/ltt-ring-buffer-client.h new file mode 100644 index 00000000..0d8051ec --- /dev/null +++ b/libust/ltt-ring-buffer-client.h @@ -0,0 +1,525 @@ +/* + * ltt-ring-buffer-client.h + * + * Copyright (C) 2010 - Mathieu Desnoyers + * + * LTTng lib ring buffer client template. + * + * Dual LGPL v2.1/GPL v2 license. + */ + +#include +#include +#include "lib/bitfield.h" +#include "wrapper/vmalloc.h" /* for wrapper_vmalloc_sync_all() */ +#include "wrapper/trace-clock.h" +#include "ltt-events.h" +#include "ltt-tracer.h" +#include "wrapper/ringbuffer/frontend_types.h" + +/* + * Keep the natural field alignment for _each field_ within this structure if + * you ever add/remove a field from this header. Packed attribute is not used + * because gcc generates poor code on at least powerpc and mips. Don't ever + * let gcc add padding between the structure elements. + */ + +struct packet_header { + /* Trace packet header */ + uint32_t magic; /* + * Trace magic number. + * contains endianness information. + */ + uint8_t uuid[16]; + uint32_t stream_id; + + struct { + /* Stream packet context */ + uint64_t timestamp_begin; /* Cycle count at subbuffer start */ + uint64_t timestamp_end; /* Cycle count at subbuffer end */ + uint32_t events_discarded; /* + * Events lost in this subbuffer since + * the beginning of the trace. + * (may overflow) + */ + uint32_t content_size; /* Size of data in subbuffer */ + uint32_t packet_size; /* Subbuffer size (include padding) */ + uint32_t cpu_id; /* CPU id associated with stream */ + uint8_t header_end; /* End of header */ + } ctx; +}; + + +static inline notrace u64 lib_ring_buffer_clock_read(struct channel *chan) +{ + return trace_clock_read64(); +} + +static inline +size_t ctx_get_size(size_t offset, struct lttng_ctx *ctx) +{ + int i; + size_t orig_offset = offset; + + if (likely(!ctx)) + return 0; + for (i = 0; i < ctx->nr_fields; i++) + offset += ctx->fields[i].get_size(offset); + return offset - orig_offset; +} + +static inline +void ctx_record(struct lib_ring_buffer_ctx *bufctx, + struct ltt_channel *chan, + struct lttng_ctx *ctx) +{ + int i; + + if (likely(!ctx)) + return; + for (i = 0; i < ctx->nr_fields; i++) + ctx->fields[i].record(&ctx->fields[i], bufctx, chan); +} + +/* + * record_header_size - Calculate the header size and padding necessary. + * @config: ring buffer instance configuration + * @chan: channel + * @offset: offset in the write buffer + * @pre_header_padding: padding to add before the header (output) + * @ctx: reservation context + * + * Returns the event header size (including padding). + * + * The payload must itself determine its own alignment from the biggest type it + * contains. + */ +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) +{ + struct ltt_channel *ltt_chan = channel_get_private(chan); + struct ltt_event *event = ctx->priv; + size_t orig_offset = offset; + size_t padding; + + switch (ltt_chan->header_type) { + case 1: /* compact */ + padding = lib_ring_buffer_align(offset, ltt_alignof(uint32_t)); + offset += padding; + if (!(ctx->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTT_RFLAG_EXTENDED))) { + offset += sizeof(uint32_t); /* id and timestamp */ + } else { + /* Minimum space taken by 5-bit id */ + offset += sizeof(uint8_t); + /* Align extended struct on largest member */ + offset += lib_ring_buffer_align(offset, ltt_alignof(uint64_t)); + offset += sizeof(uint32_t); /* id */ + offset += lib_ring_buffer_align(offset, ltt_alignof(uint64_t)); + offset += sizeof(uint64_t); /* timestamp */ + } + break; + case 2: /* large */ + padding = lib_ring_buffer_align(offset, ltt_alignof(uint16_t)); + offset += padding; + offset += sizeof(uint16_t); + if (!(ctx->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTT_RFLAG_EXTENDED))) { + offset += lib_ring_buffer_align(offset, ltt_alignof(uint32_t)); + offset += sizeof(uint32_t); /* timestamp */ + } else { + /* Align extended struct on largest member */ + offset += lib_ring_buffer_align(offset, ltt_alignof(uint64_t)); + offset += sizeof(uint32_t); /* id */ + offset += lib_ring_buffer_align(offset, ltt_alignof(uint64_t)); + offset += sizeof(uint64_t); /* timestamp */ + } + break; + default: + WARN_ON_ONCE(1); + } + offset += ctx_get_size(offset, event->ctx); + offset += ctx_get_size(offset, ltt_chan->ctx); + + *pre_header_padding = padding; + return offset - orig_offset; +} + +#include "wrapper/ringbuffer/api.h" + +extern +void ltt_write_event_header_slow(const struct lib_ring_buffer_config *config, + struct lib_ring_buffer_ctx *ctx, + uint32_t event_id); + +/* + * ltt_write_event_header + * + * Writes the event header to the offset (already aligned on 32-bits). + * + * @config: ring buffer instance configuration + * @ctx: reservation context + * @event_id: event ID + */ +static __inline__ +void ltt_write_event_header(const struct lib_ring_buffer_config *config, + struct lib_ring_buffer_ctx *ctx, + uint32_t event_id) +{ + struct ltt_channel *ltt_chan = channel_get_private(ctx->chan); + struct ltt_event *event = ctx->priv; + + if (unlikely(ctx->rflags)) + goto slow_path; + + switch (ltt_chan->header_type) { + case 1: /* compact */ + { + uint32_t id_time = 0; + + bt_bitfield_write(&id_time, uint32_t, 0, 5, event_id); + bt_bitfield_write(&id_time, uint32_t, 5, 27, ctx->tsc); + lib_ring_buffer_write(config, ctx, &id_time, sizeof(id_time)); + break; + } + case 2: /* large */ + { + uint32_t timestamp = (uint32_t) ctx->tsc; + uint16_t id = event_id; + + lib_ring_buffer_write(config, ctx, &id, sizeof(id)); + lib_ring_buffer_align_ctx(ctx, ltt_alignof(uint32_t)); + lib_ring_buffer_write(config, ctx, ×tamp, sizeof(timestamp)); + break; + } + default: + WARN_ON_ONCE(1); + } + + ctx_record(ctx, ltt_chan, event->ctx); + ctx_record(ctx, ltt_chan, ltt_chan->ctx); + + return; + +slow_path: + ltt_write_event_header_slow(config, ctx, event_id); +} + +void ltt_write_event_header_slow(const struct lib_ring_buffer_config *config, + struct lib_ring_buffer_ctx *ctx, + uint32_t event_id) +{ + struct ltt_channel *ltt_chan = channel_get_private(ctx->chan); + struct ltt_event *event = ctx->priv; + + switch (ltt_chan->header_type) { + case 1: /* compact */ + if (!(ctx->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTT_RFLAG_EXTENDED))) { + uint32_t id_time = 0; + + bt_bitfield_write(&id_time, uint32_t, 0, 5, event_id); + bt_bitfield_write(&id_time, uint32_t, 5, 27, ctx->tsc); + lib_ring_buffer_write(config, ctx, &id_time, sizeof(id_time)); + } else { + uint8_t id = 0; + uint64_t timestamp = ctx->tsc; + + bt_bitfield_write(&id, uint8_t, 0, 5, 31); + lib_ring_buffer_write(config, ctx, &id, sizeof(id)); + /* Align extended struct on largest member */ + lib_ring_buffer_align_ctx(ctx, ltt_alignof(uint64_t)); + lib_ring_buffer_write(config, ctx, &event_id, sizeof(event_id)); + lib_ring_buffer_align_ctx(ctx, ltt_alignof(uint64_t)); + lib_ring_buffer_write(config, ctx, ×tamp, sizeof(timestamp)); + } + break; + case 2: /* large */ + { + if (!(ctx->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTT_RFLAG_EXTENDED))) { + uint32_t timestamp = (uint32_t) ctx->tsc; + uint16_t id = event_id; + + lib_ring_buffer_write(config, ctx, &id, sizeof(id)); + lib_ring_buffer_align_ctx(ctx, ltt_alignof(uint32_t)); + lib_ring_buffer_write(config, ctx, ×tamp, sizeof(timestamp)); + } else { + uint16_t id = 65535; + uint64_t timestamp = ctx->tsc; + + lib_ring_buffer_write(config, ctx, &id, sizeof(id)); + /* Align extended struct on largest member */ + lib_ring_buffer_align_ctx(ctx, ltt_alignof(uint64_t)); + lib_ring_buffer_write(config, ctx, &event_id, sizeof(event_id)); + lib_ring_buffer_align_ctx(ctx, ltt_alignof(uint64_t)); + lib_ring_buffer_write(config, ctx, ×tamp, sizeof(timestamp)); + } + break; + } + default: + WARN_ON_ONCE(1); + } + ctx_record(ctx, ltt_chan, event->ctx); + ctx_record(ctx, ltt_chan, ltt_chan->ctx); +} + +static const struct lib_ring_buffer_config client_config; + +static u64 client_ring_buffer_clock_read(struct channel *chan) +{ + return lib_ring_buffer_clock_read(chan); +} + +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 record_header_size(config, chan, offset, + pre_header_padding, ctx); +} + +/** + * 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 packet_header, ctx.header_end); +} + +static void client_buffer_begin(struct lib_ring_buffer *buf, u64 tsc, + unsigned int subbuf_idx) +{ + struct channel *chan = buf->backend.chan; + struct packet_header *header = + (struct 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 = CTF_MAGIC_NUMBER; + memcpy(header->uuid, session->uuid.b, sizeof(session->uuid)); + header->stream_id = ltt_chan->id; + header->ctx.timestamp_begin = tsc; + header->ctx.timestamp_end = 0; + header->ctx.events_discarded = 0; + header->ctx.content_size = 0xFFFFFFFF; /* for debugging */ + header->ctx.packet_size = 0xFFFFFFFF; + header->ctx.cpu_id = buf->backend.cpu; +} + +/* + * 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 = buf->backend.chan; + struct packet_header *header = + (struct packet_header *) + lib_ring_buffer_offset_address(&buf->backend, + subbuf_idx * chan->backend.subbuf_size); + unsigned long records_lost = 0; + + header->ctx.timestamp_end = tsc; + header->ctx.content_size = data_size * CHAR_BIT; /* in bits */ + header->ctx.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); + header->ctx.events_discarded = records_lost; +} + +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 = 32, + .alloc = RING_BUFFER_ALLOC_PER_CPU, + .sync = RING_BUFFER_SYNC_PER_CPU, + .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 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) +{ + 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 channel *chan) +{ + channel_destroy(chan); +} + +static +struct lib_ring_buffer *ltt_buffer_read_open(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 (!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) +{ + struct ltt_channel *ltt_chan = channel_get_private(ctx->chan); + int ret, cpu; + + cpu = lib_ring_buffer_get_cpu(&client_config); + if (cpu < 0) + return -EPERM; + ctx->cpu = cpu; + + switch (ltt_chan->header_type) { + case 1: /* compact */ + if (event_id > 30) + ctx->rflags |= LTT_RFLAG_EXTENDED; + break; + case 2: /* large */ + if (event_id > 65534) + ctx->rflags |= LTT_RFLAG_EXTENDED; + break; + default: + WARN_ON_ONCE(1); + } + + ret = lib_ring_buffer_reserve(&client_config, ctx); + if (ret) + goto put; + ltt_write_event_header(&client_config, ctx, event_id); + return 0; +put: + lib_ring_buffer_put_cpu(&client_config); + return ret; +} + +static +void ltt_event_commit(struct lib_ring_buffer_ctx *ctx) +{ + lib_ring_buffer_commit(&client_config, ctx); + lib_ring_buffer_put_cpu(&client_config); +} + +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 +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; +} + +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, + .owner = THIS_MODULE, + .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 = NULL, /* Would be racy anyway */ + .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 int __init ltt_ring_buffer_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_all(); + printk(KERN_INFO "LTT : ltt ring buffer client init\n"); + ltt_transport_register(<t_relay_transport); + return 0; +} + +module_init(ltt_ring_buffer_client_init); + +static void __exit ltt_ring_buffer_client_exit(void) +{ + printk(KERN_INFO "LTT : ltt ring buffer client exit\n"); + ltt_transport_unregister(<t_relay_transport); +} + +module_exit(ltt_ring_buffer_client_exit); + +MODULE_LICENSE("GPL and additional rights"); +MODULE_AUTHOR("Mathieu Desnoyers"); +MODULE_DESCRIPTION("LTTng ring buffer " RING_BUFFER_MODE_TEMPLATE_STRING + " client"); diff --git a/libust/ltt-ring-buffer-metadata-client.c b/libust/ltt-ring-buffer-metadata-client.c new file mode 100644 index 00000000..64f44085 --- /dev/null +++ b/libust/ltt-ring-buffer-metadata-client.c @@ -0,0 +1,20 @@ +/* + * ltt-ring-buffer-metadata-client.c + * + * Copyright (C) 2010 - Mathieu Desnoyers + * + * LTTng lib ring buffer metadta client. + * + * Dual LGPL v2.1/GPL v2 license. + */ + +#include +#include "ltt-tracer.h" + +#define RING_BUFFER_MODE_TEMPLATE RING_BUFFER_DISCARD +#define RING_BUFFER_MODE_TEMPLATE_STRING "metadata" +#include "ltt-ring-buffer-metadata-client.h" + +MODULE_LICENSE("GPL and additional rights"); +MODULE_AUTHOR("Mathieu Desnoyers"); +MODULE_DESCRIPTION("LTTng Ring Buffer Metadata Client"); diff --git a/libust/ltt-ring-buffer-metadata-client.h b/libust/ltt-ring-buffer-metadata-client.h new file mode 100644 index 00000000..8b1079d9 --- /dev/null +++ b/libust/ltt-ring-buffer-metadata-client.h @@ -0,0 +1,290 @@ +/* + * ltt-ring-buffer-client.h + * + * Copyright (C) 2010 - Mathieu Desnoyers + * + * LTTng lib ring buffer client template. + * + * Dual LGPL v2.1/GPL v2 license. + */ + +#include +#include +#include "wrapper/vmalloc.h" /* for wrapper_vmalloc_sync_all() */ +#include "ltt-events.h" +#include "ltt-tracer.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 "wrapper/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) +{ + 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 = 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.b, 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 = 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 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) +{ + 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 channel *chan) +{ + channel_destroy(chan); +} + +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 = 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); + } +} + +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; +} + +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, + .owner = THIS_MODULE, + .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 int __init ltt_ring_buffer_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_all(); + printk(KERN_INFO "LTT : ltt ring buffer metadata client init\n"); + ltt_transport_register(<t_relay_transport); + return 0; +} + +module_init(ltt_ring_buffer_client_init); + +static void __exit ltt_ring_buffer_client_exit(void) +{ + printk(KERN_INFO "LTT : ltt ring buffer metadata client exit\n"); + ltt_transport_unregister(<t_relay_transport); +} + +module_exit(ltt_ring_buffer_client_exit); + +MODULE_LICENSE("GPL and additional rights"); +MODULE_AUTHOR("Mathieu Desnoyers"); +MODULE_DESCRIPTION("LTTng ring buffer " RING_BUFFER_MODE_TEMPLATE_STRING + " client"); -- 2.34.1