/*
- * lttng-ring-buffer-client.h
- *
- * LTTng lib ring buffer client template.
+ * SPDX-License-Identifier: LGPL-2.1-only
*
* Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; only
- * version 2.1 of the License.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ * LTTng lib ring buffer client template.
*/
+#include <stddef.h>
#include <stdint.h>
-#include <lttng/ust-events.h>
-#include "lttng/bitfield.h"
+
+#include <ust-events-internal.h>
+#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
*/
uint8_t uuid[LTTNG_UST_UUID_LEN];
uint32_t stream_id;
+ uint64_t stream_instance_id;
struct {
/* Stream packet context */
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.
} ctx;
};
+struct lttng_client_ctx {
+ size_t packet_context_len;
+ size_t event_context_len;
+};
-static inline uint64_t lib_ring_buffer_clock_read(struct channel *chan)
+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_size(size_t offset, struct lttng_ctx *ctx)
+size_t ctx_get_aligned_size(size_t offset, struct lttng_ust_ctx *ctx,
+ size_t ctx_len)
{
- int i;
size_t orig_offset = offset;
if (caa_likely(!ctx))
return 0;
- for (i = 0; i < ctx->nr_fields; i++)
- offset += ctx->fields[i].get_size(offset);
+ 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_channel *chan,
- struct lttng_ctx *ctx)
+ struct lttng_ust_ctx *ctx,
+ enum app_ctx_mode mode)
{
int i;
if (caa_likely(!ctx))
return;
- for (i = 0; i < ctx->nr_fields; i++)
- ctx->fields[i].record(&ctx->fields[i], bufctx, chan);
+ 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);
+ }
+ }
+ }
}
/*
* contains.
*/
static __inline__
-unsigned char record_header_size(const struct lttng_ust_lib_ring_buffer_config *config,
- struct channel *chan, size_t offset,
+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_ust_lib_ring_buffer_ctx *ctx,
+ struct lttng_client_ctx *client_ctx)
{
struct lttng_channel *lttng_chan = channel_get_private(chan);
- struct lttng_event *event = ctx->priv;
+ struct lttng_ust_stack_ctx *lttng_ctx = ctx->priv;
size_t orig_offset = offset;
size_t padding;
padding = 0;
WARN_ON_ONCE(1);
}
- offset += ctx_get_size(offset, event->ctx);
- offset += ctx_get_size(offset, lttng_chan->ctx);
-
+ offset += ctx_get_aligned_size(offset, lttng_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;
}
uint32_t event_id)
{
struct lttng_channel *lttng_chan = channel_get_private(ctx->chan);
- struct lttng_event *event = ctx->priv;
+ struct lttng_ust_stack_ctx *lttng_ctx = ctx->priv;
if (caa_unlikely(ctx->rflags))
goto slow_path;
WARN_ON_ONCE(1);
}
- ctx_record(ctx, lttng_chan, lttng_chan->ctx);
- ctx_record(ctx, lttng_chan, event->ctx);
+ ctx_record(ctx, lttng_chan, lttng_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;
uint32_t event_id)
{
struct lttng_channel *lttng_chan = channel_get_private(ctx->chan);
- struct lttng_event *event = ctx->priv;
+ struct lttng_ust_stack_ctx *lttng_ctx = ctx->priv;
switch (lttng_chan->header_type) {
case 1: /* compact */
default:
WARN_ON_ONCE(1);
}
- ctx_record(ctx, lttng_chan, lttng_chan->ctx);
- ctx_record(ctx, lttng_chan, event->ctx);
+ ctx_record(ctx, lttng_chan, lttng_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 channel *chan)
+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 channel *chan, size_t offset,
+ 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_ust_lib_ring_buffer_ctx *ctx,
+ void *client_ctx)
{
return record_header_size(config, chan, offset,
- pre_header_padding, ctx);
+ pre_header_padding, ctx, client_ctx);
}
/**
unsigned int subbuf_idx,
struct lttng_ust_shm_handle *handle)
{
- struct channel *chan = shmp(handle, buf->backend.chan);
+ 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_channel *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->uuid, sizeof(lttng_chan->uuid));
header->stream_id = lttng_chan->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;
}
unsigned int subbuf_idx, unsigned long data_size,
struct lttng_ust_shm_handle *handle)
{
- struct channel *chan = shmp(handle, buf->backend.chan);
+ 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,
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) PAGE_ALIGN(data_size) * CHAR_BIT; /* in bits */
+ (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);
{
}
+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_channel *lttng_chan = channel_get_private(chan);
+
+ *stream_id = lttng_chan->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 = {
.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.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,
.cb_ptr = &client_cb.parent,
};
-const struct lttng_ust_client_lib_ring_buffer_client_cb *LTTNG_CLIENT_CALLBACKS = &client_cb;
-
static
struct lttng_channel *_channel_create(const char *name,
void *buf_addr,
unsigned int switch_timer_interval,
unsigned int read_timer_interval,
unsigned char *uuid,
- uint32_t chan_id)
+ uint32_t chan_id,
+ const int *stream_fds, int nr_stream_fds,
+ int64_t blocking_timeout)
{
struct lttng_channel chan_priv_init;
struct lttng_ust_shm_handle *handle;
sizeof(struct lttng_channel),
&chan_priv_init,
buf_addr, subbuf_size, num_subbuf,
- switch_timer_interval, read_timer_interval);
+ switch_timer_interval, read_timer_interval,
+ stream_fds, nr_stream_fds, blocking_timeout);
if (!handle)
return NULL;
lttng_chan = priv;
uint32_t event_id)
{
struct lttng_channel *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;
+ /* Compute internal size of context structures. */
+ ctx_get_struct_size(lttng_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;
WARN_ON_ONCE(1);
}
- ret = lib_ring_buffer_reserve(&client_config, ctx);
- if (ret)
+ 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, event_id);
return 0;
put:
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 channel *chan)
+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 channel *chan)
+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 channel *chan)
+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 channel *chan)
+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 channel *chan, struct lttng_ust_shm_handle *handle)
+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;
static struct lttng_transport lttng_relay_transport = {
.name = "relay-" RING_BUFFER_MODE_TEMPLATE_STRING "-mmap",
.ops = {
+ .struct_size = sizeof(struct lttng_ust_channel_ops),
.channel_create = _channel_create,
.channel_destroy = lttng_channel_destroy,
.event_reserve = lttng_event_reserve,
.event_commit = lttng_event_commit,
.event_write = lttng_event_write,
.packet_avail_size = NULL, /* Would be racy anyway */
- //.get_reader_wait_queue = lttng_get_reader_wait_queue,
- //.get_hp_wait_queue = lttng_get_hp_wait_queue,
.is_finalized = lttng_is_finalized,
.is_disabled = lttng_is_disabled,
.flush_buffer = lttng_flush_buffer,
+ .event_strcpy = lttng_event_strcpy,
},
.client_config = &client_config,
};