X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=liblttng-ust%2Flttng-ring-buffer-client.h;h=7078938dbeb16b78326bef9a587d828072f15163;hb=HEAD;hp=871170366429a4b329561395acf243c839e2ac5d;hpb=0950190a1ef3270ac1a93e5c1647361320776f5e;p=lttng-ust.git diff --git a/liblttng-ust/lttng-ring-buffer-client.h b/liblttng-ust/lttng-ring-buffer-client.h deleted file mode 100644 index 87117036..00000000 --- a/liblttng-ust/lttng-ring-buffer-client.h +++ /dev/null @@ -1,845 +0,0 @@ -/* - * SPDX-License-Identifier: LGPL-2.1-only - * - * Copyright (C) 2010-2012 Mathieu Desnoyers - * - * LTTng lib ring buffer client template. - */ - -#include -#include - -#include -#include -#include "ust-bitfield.h" -#include "ust-compat.h" -#include "clock.h" -#include "context-internal.h" -#include "lttng-tracer.h" -#include "../libringbuffer/frontend_types.h" - -#define LTTNG_COMPACT_EVENT_BITS 5 -#define LTTNG_COMPACT_TSC_BITS 27 - -enum app_ctx_mode { - APP_CTX_DISABLED, - APP_CTX_ENABLED, -}; - -/* - * 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[LTTNG_UST_UUID_LEN]; - uint32_t stream_id; - uint64_t stream_instance_id; - - struct { - /* Stream packet context */ - uint64_t timestamp_begin; /* Cycle count at subbuffer start */ - uint64_t timestamp_end; /* Cycle count at subbuffer end */ - uint64_t content_size; /* Size of data in subbuffer */ - uint64_t packet_size; /* Subbuffer size (include padding) */ - uint64_t packet_seq_num; /* Packet sequence number */ - unsigned long events_discarded; /* - * Events lost in this subbuffer since - * the beginning of the trace. - * (may overflow) - */ - uint32_t cpu_id; /* CPU id associated with stream */ - uint8_t header_end; /* End of header */ - } ctx; -}; - -struct lttng_client_ctx { - size_t packet_context_len; - size_t event_context_len; - struct lttng_ust_ctx *chan_ctx; -}; - -static inline uint64_t lib_ring_buffer_clock_read(struct lttng_ust_lib_ring_buffer_channel *chan) -{ - return trace_clock_read64(); -} - -static inline -size_t ctx_get_aligned_size(size_t offset, struct lttng_ust_ctx *ctx, - size_t ctx_len) -{ - size_t orig_offset = offset; - - if (caa_likely(!ctx)) - return 0; - offset += lib_ring_buffer_align(offset, ctx->largest_align); - offset += ctx_len; - return offset - orig_offset; -} - -static inline -void ctx_get_struct_size(struct lttng_ust_ctx *ctx, size_t *ctx_len, - enum app_ctx_mode mode) -{ - int i; - size_t offset = 0; - - if (caa_likely(!ctx)) { - *ctx_len = 0; - return; - } - for (i = 0; i < ctx->nr_fields; i++) { - if (mode == APP_CTX_ENABLED) { - offset += ctx->fields[i]->get_size(ctx->fields[i], offset); - } else { - if (lttng_context_is_app(ctx->fields[i]->event_field->name)) { - /* - * Before UST 2.8, we cannot use the - * application context, because we - * cannot trust that the handler used - * for get_size is the same used for - * ctx_record, which would result in - * corrupted traces when tracing - * concurrently with application context - * register/unregister. - */ - offset += lttng_ust_dummy_get_size(ctx->fields[i], offset); - } else { - offset += ctx->fields[i]->get_size(ctx->fields[i], offset); - } - } - } - *ctx_len = offset; -} - -static inline -void ctx_record(struct lttng_ust_lib_ring_buffer_ctx *bufctx, - struct lttng_ust_channel_buffer *chan, - struct lttng_ust_ctx *ctx, - enum app_ctx_mode mode) -{ - int i; - - if (caa_likely(!ctx)) - return; - lib_ring_buffer_align_ctx(bufctx, ctx->largest_align); - for (i = 0; i < ctx->nr_fields; i++) { - if (mode == APP_CTX_ENABLED) { - ctx->fields[i]->record(ctx->fields[i], bufctx, chan); - } else { - if (lttng_context_is_app(ctx->fields[i]->event_field->name)) { - /* - * Before UST 2.8, we cannot use the - * application context, because we - * cannot trust that the handler used - * for get_size is the same used for - * ctx_record, which would result in - * corrupted traces when tracing - * concurrently with application context - * register/unregister. - */ - lttng_ust_dummy_record(ctx->fields[i], bufctx, chan); - } else { - 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__ -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, - struct lttng_client_ctx *client_ctx) -{ - struct lttng_ust_channel_buffer *lttng_chan = channel_get_private(chan); - struct lttng_ust_stack_ctx *lttng_ctx = ctx->priv; - size_t orig_offset = offset; - size_t padding; - - switch (lttng_chan->priv->header_type) { - case 1: /* compact */ - padding = lib_ring_buffer_align(offset, lttng_alignof(uint32_t)); - offset += padding; - if (!(ctx->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTTNG_RFLAG_EXTENDED))) { - offset += sizeof(uint32_t); /* id and timestamp */ - } else { - /* Minimum space taken by LTTNG_COMPACT_EVENT_BITS id */ - offset += (LTTNG_COMPACT_EVENT_BITS + CHAR_BIT - 1) / CHAR_BIT; - /* Align extended struct on largest member */ - offset += lib_ring_buffer_align(offset, lttng_alignof(uint64_t)); - offset += sizeof(uint32_t); /* id */ - offset += lib_ring_buffer_align(offset, lttng_alignof(uint64_t)); - offset += sizeof(uint64_t); /* timestamp */ - } - break; - case 2: /* large */ - padding = lib_ring_buffer_align(offset, lttng_alignof(uint16_t)); - offset += padding; - offset += sizeof(uint16_t); - if (!(ctx->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTTNG_RFLAG_EXTENDED))) { - offset += lib_ring_buffer_align(offset, lttng_alignof(uint32_t)); - offset += sizeof(uint32_t); /* timestamp */ - } else { - /* Align extended struct on largest member */ - offset += lib_ring_buffer_align(offset, lttng_alignof(uint64_t)); - offset += sizeof(uint32_t); /* id */ - offset += lib_ring_buffer_align(offset, lttng_alignof(uint64_t)); - offset += sizeof(uint64_t); /* timestamp */ - } - break; - default: - padding = 0; - WARN_ON_ONCE(1); - } - offset += ctx_get_aligned_size(offset, client_ctx->chan_ctx, - client_ctx->packet_context_len); - offset += ctx_get_aligned_size(offset, lttng_ctx->event_ctx, - client_ctx->event_context_len); - *pre_header_padding = padding; - return offset - orig_offset; -} - -#include "../libringbuffer/api.h" -#include "lttng-rb-clients.h" - -static -void lttng_write_event_header_slow(const struct lttng_ust_lib_ring_buffer_config *config, - struct lttng_ust_lib_ring_buffer_ctx *ctx, - struct lttng_client_ctx *client_ctx, - uint32_t event_id); - -/* - * lttng_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 lttng_write_event_header(const struct lttng_ust_lib_ring_buffer_config *config, - struct lttng_ust_lib_ring_buffer_ctx *ctx, - struct lttng_client_ctx *client_ctx, - uint32_t event_id) -{ - struct lttng_ust_channel_buffer *lttng_chan = channel_get_private(ctx->chan); - struct lttng_ust_stack_ctx *lttng_ctx = ctx->priv; - - if (caa_unlikely(ctx->rflags)) - goto slow_path; - - switch (lttng_chan->priv->header_type) { - case 1: /* compact */ - { - uint32_t id_time = 0; - - bt_bitfield_write(&id_time, uint32_t, - 0, - LTTNG_COMPACT_EVENT_BITS, - event_id); - bt_bitfield_write(&id_time, uint32_t, - LTTNG_COMPACT_EVENT_BITS, - LTTNG_COMPACT_TSC_BITS, - 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, lttng_alignof(uint32_t)); - lib_ring_buffer_write(config, ctx, ×tamp, sizeof(timestamp)); - break; - } - default: - WARN_ON_ONCE(1); - } - - ctx_record(ctx, lttng_chan, client_ctx->chan_ctx, APP_CTX_ENABLED); - ctx_record(ctx, lttng_chan, lttng_ctx->event_ctx, APP_CTX_ENABLED); - lib_ring_buffer_align_ctx(ctx, ctx->largest_align); - - return; - -slow_path: - lttng_write_event_header_slow(config, ctx, client_ctx, event_id); -} - -static -void lttng_write_event_header_slow(const struct lttng_ust_lib_ring_buffer_config *config, - struct lttng_ust_lib_ring_buffer_ctx *ctx, - struct lttng_client_ctx *client_ctx, - uint32_t event_id) -{ - struct lttng_ust_channel_buffer *lttng_chan = channel_get_private(ctx->chan); - struct lttng_ust_stack_ctx *lttng_ctx = ctx->priv; - - switch (lttng_chan->priv->header_type) { - case 1: /* compact */ - if (!(ctx->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTTNG_RFLAG_EXTENDED))) { - uint32_t id_time = 0; - - bt_bitfield_write(&id_time, uint32_t, - 0, - LTTNG_COMPACT_EVENT_BITS, - event_id); - bt_bitfield_write(&id_time, uint32_t, - LTTNG_COMPACT_EVENT_BITS, - LTTNG_COMPACT_TSC_BITS, - 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, - LTTNG_COMPACT_EVENT_BITS, - 31); - lib_ring_buffer_write(config, ctx, &id, sizeof(id)); - /* Align extended struct on largest member */ - lib_ring_buffer_align_ctx(ctx, lttng_alignof(uint64_t)); - lib_ring_buffer_write(config, ctx, &event_id, sizeof(event_id)); - lib_ring_buffer_align_ctx(ctx, lttng_alignof(uint64_t)); - lib_ring_buffer_write(config, ctx, ×tamp, sizeof(timestamp)); - } - break; - case 2: /* large */ - { - if (!(ctx->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTTNG_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, lttng_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, lttng_alignof(uint64_t)); - lib_ring_buffer_write(config, ctx, &event_id, sizeof(event_id)); - lib_ring_buffer_align_ctx(ctx, lttng_alignof(uint64_t)); - lib_ring_buffer_write(config, ctx, ×tamp, sizeof(timestamp)); - } - break; - } - default: - WARN_ON_ONCE(1); - } - ctx_record(ctx, lttng_chan, client_ctx->chan_ctx, APP_CTX_ENABLED); - ctx_record(ctx, lttng_chan, lttng_ctx->event_ctx, APP_CTX_ENABLED); - lib_ring_buffer_align_ctx(ctx, ctx->largest_align); -} - -static const struct lttng_ust_lib_ring_buffer_config client_config; - -static uint64_t client_ring_buffer_clock_read(struct lttng_ust_lib_ring_buffer_channel *chan) -{ - return lib_ring_buffer_clock_read(chan); -} - -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 record_header_size(config, chan, offset, - pre_header_padding, ctx, client_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 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 packet_header *header = - (struct 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); - uint64_t cnt = shmp_index(handle, buf->backend.buf_cnt, subbuf_idx)->seq_cnt; - - assert(header); - if (!header) - return; - header->magic = CTF_MAGIC_NUMBER; - memcpy(header->uuid, lttng_chan->priv->uuid, sizeof(lttng_chan->priv->uuid)); - header->stream_id = lttng_chan->priv->id; - header->stream_instance_id = buf->backend.cpu; - header->ctx.timestamp_begin = tsc; - header->ctx.timestamp_end = 0; - header->ctx.content_size = ~0ULL; /* for debugging */ - header->ctx.packet_size = ~0ULL; - header->ctx.packet_seq_num = chan->backend.num_subbuf * cnt + subbuf_idx; - header->ctx.events_discarded = 0; - 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 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 packet_header *header = - (struct 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->ctx.timestamp_end = tsc; - header->ctx.content_size = - (uint64_t) data_size * CHAR_BIT; /* in bits */ - header->ctx.packet_size = - (uint64_t) LTTNG_UST_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 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 void client_content_size_field(const struct lttng_ust_lib_ring_buffer_config *config, - size_t *offset, size_t *length) -{ - *offset = offsetof(struct packet_header, ctx.content_size); - *length = sizeof(((struct packet_header *) NULL)->ctx.content_size); -} - -static void client_packet_size_field(const struct lttng_ust_lib_ring_buffer_config *config, - size_t *offset, size_t *length) -{ - *offset = offsetof(struct packet_header, ctx.packet_size); - *length = sizeof(((struct packet_header *) NULL)->ctx.packet_size); -} - -static struct packet_header *client_packet_header(struct lttng_ust_lib_ring_buffer *buf, - struct lttng_ust_shm_handle *handle) -{ - return lib_ring_buffer_read_offset_address(&buf->backend, 0, handle); -} - -static int client_timestamp_begin(struct lttng_ust_lib_ring_buffer *buf, - struct lttng_ust_shm_handle *handle, - uint64_t *timestamp_begin) -{ - struct packet_header *header; - - header = client_packet_header(buf, handle); - if (!header) - return -1; - *timestamp_begin = header->ctx.timestamp_begin; - return 0; -} - -static int client_timestamp_end(struct lttng_ust_lib_ring_buffer *buf, - struct lttng_ust_shm_handle *handle, - uint64_t *timestamp_end) -{ - struct packet_header *header; - - header = client_packet_header(buf, handle); - if (!header) - return -1; - *timestamp_end = header->ctx.timestamp_end; - return 0; -} - -static int client_events_discarded(struct lttng_ust_lib_ring_buffer *buf, - struct lttng_ust_shm_handle *handle, - uint64_t *events_discarded) -{ - struct packet_header *header; - - header = client_packet_header(buf, handle); - if (!header) - return -1; - *events_discarded = header->ctx.events_discarded; - return 0; -} - -static int client_content_size(struct lttng_ust_lib_ring_buffer *buf, - struct lttng_ust_shm_handle *handle, - uint64_t *content_size) -{ - struct packet_header *header; - - header = client_packet_header(buf, handle); - if (!header) - return -1; - *content_size = header->ctx.content_size; - return 0; -} - -static int client_packet_size(struct lttng_ust_lib_ring_buffer *buf, - struct lttng_ust_shm_handle *handle, - uint64_t *packet_size) -{ - struct packet_header *header; - - header = client_packet_header(buf, handle); - if (!header) - return -1; - *packet_size = header->ctx.packet_size; - return 0; -} - -static int client_stream_id(struct lttng_ust_lib_ring_buffer *buf, - struct lttng_ust_shm_handle *handle, - uint64_t *stream_id) -{ - struct lttng_ust_lib_ring_buffer_channel *chan = shmp(handle, - buf->backend.chan); - struct lttng_ust_channel_buffer *lttng_chan = channel_get_private(chan); - - *stream_id = lttng_chan->priv->id; - - return 0; -} - -static int client_current_timestamp(struct lttng_ust_lib_ring_buffer *buf, - struct lttng_ust_shm_handle *handle, - uint64_t *ts) -{ - struct lttng_ust_lib_ring_buffer_channel *chan; - - chan = shmp(handle, handle->chan); - *ts = client_ring_buffer_clock_read(chan); - - return 0; -} - -static int client_sequence_number(struct lttng_ust_lib_ring_buffer *buf, - struct lttng_ust_shm_handle *handle, - uint64_t *seq) -{ - struct packet_header *header; - - header = client_packet_header(buf, handle); - if (!header) - return -1; - *seq = header->ctx.packet_seq_num; - return 0; -} - -static int client_instance_id(struct lttng_ust_lib_ring_buffer *buf, - struct lttng_ust_shm_handle *handle, - uint64_t *id) -{ - *id = buf->backend.cpu; - - return 0; -} - -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, - .content_size_field = client_content_size_field, - .packet_size_field = client_packet_size_field, - }, - .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 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, - .cb.content_size_field = client_content_size_field, - .cb.packet_size_field = client_packet_size_field, - - .tsc_bits = LTTNG_COMPACT_TSC_BITS, - .alloc = RING_BUFFER_ALLOC_PER_CPU, - .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 = LTTNG_CLIENT_WAKEUP, - .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_abi_channel_config), - sizeof(struct lttng_ust_abi_channel_config), - &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) -{ - struct lttng_ust_channel_buffer *lttng_chan = channel_get_private(ctx->chan); - struct lttng_ust_stack_ctx *lttng_ctx = ctx->priv; - struct lttng_client_ctx client_ctx; - int ret, cpu; - - client_ctx.chan_ctx = lttng_ust_rcu_dereference(lttng_chan->priv->ctx); - /* Compute internal size of context structures. */ - ctx_get_struct_size(client_ctx.chan_ctx, &client_ctx.packet_context_len, - APP_CTX_ENABLED); - ctx_get_struct_size(lttng_ctx->event_ctx, &client_ctx.event_context_len, - APP_CTX_ENABLED); - - cpu = lib_ring_buffer_get_cpu(&client_config); - if (cpu < 0) - return -EPERM; - ctx->cpu = cpu; - - switch (lttng_chan->priv->header_type) { - case 1: /* compact */ - if (event_id > 30) - ctx->rflags |= LTTNG_RFLAG_EXTENDED; - break; - case 2: /* large */ - if (event_id > 65534) - ctx->rflags |= LTTNG_RFLAG_EXTENDED; - break; - default: - WARN_ON_ONCE(1); - } - - ret = lib_ring_buffer_reserve(&client_config, ctx, &client_ctx); - if (caa_unlikely(ret)) - goto put; - if (lib_ring_buffer_backend_get_pages(&client_config, ctx, - &ctx->backend_pages)) { - ret = -EPERM; - goto put; - } - lttng_write_event_header(&client_config, ctx, &client_ctx, event_id); - return 0; -put: - lib_ring_buffer_put_cpu(&client_config); - return ret; -} - -static -void lttng_event_commit(struct lttng_ust_lib_ring_buffer_ctx *ctx) -{ - lib_ring_buffer_commit(&client_config, ctx); - lib_ring_buffer_put_cpu(&client_config); -} - -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 -void lttng_event_strcpy(struct lttng_ust_lib_ring_buffer_ctx *ctx, const char *src, - size_t len) -{ - lib_ring_buffer_strcpy(&client_config, ctx, src, len, '#'); -} - -#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 cpu; - - for_each_channel_cpu(cpu, chan) { - int shm_fd, wait_fd, wakeup_fd; - uint64_t memory_map_size; - - buf = channel_get_ring_buffer(&client_config, chan, - cpu, 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 = <tng_relay_transport.ops, - .channel_create = _channel_create, - .channel_destroy = lttng_channel_destroy, - .packet_avail_size = NULL, /* Would be racy anyway */ - .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, - .event_strcpy = lttng_event_strcpy, - }, - .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(<tng_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(<tng_relay_transport); -}