/*
- * lttng-events.c
- *
- * Holds LTTng per-session event registry.
+ * 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
+ * Holds LTTng per-session event registry.
*/
-#define _GNU_SOURCE
#define _LGPL_SOURCE
#include <stdio.h>
-#include <urcu/list.h>
-#include <urcu/hlist.h>
-#include <pthread.h>
+#include <assert.h>
#include <errno.h>
+#include <limits.h>
+#include <pthread.h>
#include <sys/shm.h>
#include <sys/ipc.h>
#include <stdint.h>
#include <inttypes.h>
#include <time.h>
#include <stdbool.h>
+#include <unistd.h>
+#include <dlfcn.h>
#include <lttng/ust-endian.h>
-#include "clock.h"
-#include <urcu-bp.h>
+#include <urcu/arch.h>
#include <urcu/compiler.h>
+#include <urcu/hlist.h>
+#include <urcu/list.h>
#include <urcu/uatomic.h>
-#include <urcu/arch.h>
#include <lttng/tracepoint.h>
#include <lttng/ust-events.h>
#include <helper.h>
#include <lttng/ust-ctl.h>
#include <ust-comm.h>
+#include <ust-fd.h>
#include <lttng/ust-dynamic-type.h>
#include <lttng/ust-context-provider.h>
#include "error.h"
#include "tracepoint-internal.h"
#include "string-utils.h"
+#include "lttng-bytecode.h"
#include "lttng-tracer.h"
#include "lttng-tracer-core.h"
#include "lttng-ust-statedump.h"
+#include "context-internal.h"
+#include "ust-events-internal.h"
#include "wait.h"
#include "../libringbuffer/shm.h"
+#include "../libcounter/counter.h"
#include "jhash.h"
+#include <lttng/ust-abi.h>
/*
* All operations within this file are called by the communication
*/
static CDS_LIST_HEAD(sessions);
+static CDS_LIST_HEAD(event_notifier_groups);
struct cds_list_head *_lttng_get_sessions(void)
{
}
static void _lttng_event_destroy(struct lttng_event *event);
+static void _lttng_event_notifier_destroy(
+ struct lttng_event_notifier *event_notifier);
static void _lttng_enum_destroy(struct lttng_enum *_enum);
static
-void lttng_session_lazy_sync_enablers(struct lttng_session *session);
+void lttng_session_lazy_sync_event_enablers(struct lttng_session *session);
+static
+void lttng_session_sync_event_enablers(struct lttng_session *session);
static
-void lttng_session_sync_enablers(struct lttng_session *session);
+void lttng_event_notifier_group_sync_enablers(
+ struct lttng_event_notifier_group *event_notifier_group);
static
void lttng_enabler_destroy(struct lttng_enabler *enabler);
+/*
+ * @buf must hold at least LTTNG_UST_SYM_NAME_LEN bytes.
+ */
+static
+int lttng_split_provider_event_name(const char *full_name,
+ char *buf, const char **event_name,
+ const char **provider_name)
+{
+ char *saveptr;
+
+ if (strlen(full_name) >= LTTNG_UST_SYM_NAME_LEN)
+ return -1;
+ strcpy(buf, full_name);
+ *provider_name = strtok_r(buf, ":", &saveptr); /* Stops at ':' or '\0'. */
+ if (!provider_name)
+ return -1;
+ *event_name = strtok_r(NULL, ":", &saveptr); /* Stops at ':' or '\0'. */
+ if (!event_name)
+ return -1;
+ /*
+ * Ensure we don't have leftover characters. Stops at '\0'. It validates
+ * that neither the provider nor event name contain ':'.
+ */
+ if (strtok_r(NULL, "", &saveptr))
+ return -1;
+ return 0;
+}
+
/*
* Called with ust lock held.
*/
}
}
-void synchronize_trace(void)
-{
- synchronize_rcu();
-}
-
struct lttng_session *lttng_session_create(void)
{
struct lttng_session *session;
session = zmalloc(sizeof(struct lttng_session));
if (!session)
return NULL;
- if (lttng_session_context_init(&session->ctx)) {
+ if (lttng_context_init_all(&session->ctx)) {
free(session);
return NULL;
}
CDS_INIT_LIST_HEAD(&session->events_head);
CDS_INIT_LIST_HEAD(&session->enums_head);
CDS_INIT_LIST_HEAD(&session->enablers_head);
+ CDS_INIT_LIST_HEAD(&session->counters);
+ for (i = 0; i < LTTNG_UST_EVENT_HT_SIZE; i++)
+ CDS_INIT_HLIST_HEAD(&session->events_name_ht.table[i]);
for (i = 0; i < LTTNG_UST_EVENT_HT_SIZE; i++)
- CDS_INIT_HLIST_HEAD(&session->events_ht.table[i]);
- for (i = 0; i < LTTNG_UST_ENUM_HT_SIZE; i++)
CDS_INIT_HLIST_HEAD(&session->enums_ht.table[i]);
cds_list_add(&session->node, &sessions);
return session;
}
+struct lttng_counter *lttng_ust_counter_create(
+ const char *counter_transport_name,
+ size_t number_dimensions,
+ const size_t *max_nr_elem,
+ int64_t global_sum_step,
+ bool coalesce_hits)
+{
+ struct lttng_counter_transport *counter_transport = NULL;
+ struct lttng_counter *counter = NULL;
+
+ counter_transport = lttng_counter_transport_find(counter_transport_name);
+ if (!counter_transport)
+ goto notransport;
+ counter = zmalloc(sizeof(struct lttng_counter));
+ if (!counter)
+ goto nomem;
+
+ counter->ops = &counter_transport->ops;
+ counter->transport = counter_transport;
+
+ counter->counter = counter->ops->counter_create(
+ number_dimensions, max_nr_elem, global_sum_step,
+ -1, 0, NULL, false);
+ if (!counter->counter) {
+ goto create_error;
+ }
+ counter->parent.coalesce_hits = coalesce_hits;
+
+ return counter;
+
+create_error:
+ free(counter);
+nomem:
+notransport:
+ return NULL;
+}
+
+static
+void lttng_ust_counter_destroy(struct lttng_counter *counter)
+{
+ counter->ops->counter_destroy(counter->counter);
+ free(counter);
+}
+
+struct lttng_counter *lttng_session_create_counter(
+ struct lttng_session *session,
+ const char *counter_transport_name,
+ size_t number_dimensions, const size_t *dimensions_sizes,
+ int64_t global_sum_step, bool coalesce_hits)
+{
+ struct lttng_counter *counter;
+ struct lttng_event_container *container;
+
+ counter = lttng_ust_counter_create(counter_transport_name,
+ number_dimensions, dimensions_sizes, global_sum_step,
+ coalesce_hits);
+ if (!counter) {
+ goto counter_error;
+ }
+ container = lttng_counter_get_event_container(counter);
+ container->type = LTTNG_EVENT_CONTAINER_COUNTER;
+
+ container->session = session;
+ cds_list_add(&counter->node, &session->counters);
+
+ return counter;
+
+counter_error:
+ return NULL;
+}
+
+struct lttng_event_notifier_group *lttng_event_notifier_group_create(void)
+{
+ struct lttng_event_notifier_group *event_notifier_group;
+ int i;
+
+ event_notifier_group = zmalloc(sizeof(struct lttng_event_notifier_group));
+ if (!event_notifier_group)
+ return NULL;
+
+ /* Add all contexts. */
+ if (lttng_context_init_all(&event_notifier_group->ctx)) {
+ free(event_notifier_group);
+ return NULL;
+ }
+
+ CDS_INIT_LIST_HEAD(&event_notifier_group->enablers_head);
+ CDS_INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head);
+ for (i = 0; i < LTTNG_UST_EVENT_NOTIFIER_HT_SIZE; i++)
+ CDS_INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]);
+
+ cds_list_add(&event_notifier_group->node, &event_notifier_groups);
+
+ return event_notifier_group;
+}
+
/*
* Only used internally at session destruction.
*/
event->registered = 1;
}
+static
+void register_event_notifier(struct lttng_event_notifier *event_notifier)
+{
+ int ret;
+ const struct lttng_event_desc *desc;
+
+ assert(event_notifier->registered == 0);
+ desc = event_notifier->desc;
+ ret = __tracepoint_probe_register_queue_release(desc->name,
+ desc->u.ext.event_notifier_callback, event_notifier, desc->signature);
+ WARN_ON_ONCE(ret);
+ if (!ret)
+ event_notifier->registered = 1;
+}
+
static
void unregister_event(struct lttng_event *event)
{
event->registered = 0;
}
+static
+void unregister_event_notifier(struct lttng_event_notifier *event_notifier)
+{
+ int ret;
+ const struct lttng_event_desc *desc;
+
+ assert(event_notifier->registered == 1);
+ desc = event_notifier->desc;
+ ret = __tracepoint_probe_unregister_queue_release(desc->name,
+ desc->u.ext.event_notifier_callback, event_notifier);
+ WARN_ON_ONCE(ret);
+ if (!ret)
+ event_notifier->registered = 0;
+}
+
/*
* Only used internally at session destruction.
*/
unregister_event(event);
}
+/*
+ * Only used internally at session destruction.
+ */
+static
+void _lttng_event_notifier_unregister(struct lttng_event_notifier *event_notifier)
+{
+ if (event_notifier->registered)
+ unregister_event_notifier(event_notifier);
+}
+
void lttng_session_destroy(struct lttng_session *session)
{
struct lttng_channel *chan, *tmpchan;
struct lttng_event *event, *tmpevent;
struct lttng_enum *_enum, *tmp_enum;
- struct lttng_enabler *enabler, *tmpenabler;
+ struct lttng_event_enabler *event_enabler, *event_tmpenabler;
CMM_ACCESS_ONCE(session->active) = 0;
cds_list_for_each_entry(event, &session->events_head, node) {
_lttng_event_unregister(event);
}
- synchronize_trace(); /* Wait for in-flight events to complete */
+ lttng_ust_synchronize_trace(); /* Wait for in-flight events to complete */
__tracepoint_probe_prune_release_queue();
- cds_list_for_each_entry_safe(enabler, tmpenabler,
+ cds_list_for_each_entry_safe(event_enabler, event_tmpenabler,
&session->enablers_head, node)
- lttng_enabler_destroy(enabler);
+ lttng_event_enabler_destroy(event_enabler);
cds_list_for_each_entry_safe(event, tmpevent,
&session->events_head, node)
_lttng_event_destroy(event);
free(session);
}
+void lttng_event_notifier_group_destroy(
+ struct lttng_event_notifier_group *event_notifier_group)
+{
+ int close_ret;
+ struct lttng_event_notifier_enabler *notifier_enabler, *tmpnotifier_enabler;
+ struct lttng_event_notifier *notifier, *tmpnotifier;
+
+ if (!event_notifier_group) {
+ return;
+ }
+
+ cds_list_for_each_entry(notifier,
+ &event_notifier_group->event_notifiers_head, node)
+ _lttng_event_notifier_unregister(notifier);
+
+ lttng_ust_synchronize_trace();
+
+ cds_list_for_each_entry_safe(notifier_enabler, tmpnotifier_enabler,
+ &event_notifier_group->enablers_head, node)
+ lttng_event_notifier_enabler_destroy(notifier_enabler);
+
+ cds_list_for_each_entry_safe(notifier, tmpnotifier,
+ &event_notifier_group->event_notifiers_head, node)
+ _lttng_event_notifier_destroy(notifier);
+
+ if (event_notifier_group->error_counter)
+ lttng_ust_counter_destroy(event_notifier_group->error_counter);
+
+ /* Close the notification fd to the listener of event_notifiers. */
+
+ lttng_ust_lock_fd_tracker();
+ close_ret = close(event_notifier_group->notification_fd);
+ if (!close_ret) {
+ lttng_ust_delete_fd_from_tracker(
+ event_notifier_group->notification_fd);
+ } else {
+ PERROR("close");
+ abort();
+ }
+ lttng_ust_unlock_fd_tracker();
+
+ cds_list_del(&event_notifier_group->node);
+
+ free(event_notifier_group);
+}
+
+static
+void lttng_enabler_destroy(struct lttng_enabler *enabler)
+{
+ struct lttng_ust_bytecode_node *filter_node, *tmp_filter_node;
+ struct lttng_ust_excluder_node *excluder_node, *tmp_excluder_node;
+
+ if (!enabler) {
+ return;
+ }
+
+ /* Destroy filter bytecode */
+ cds_list_for_each_entry_safe(filter_node, tmp_filter_node,
+ &enabler->filter_bytecode_head, node) {
+ free(filter_node);
+ }
+
+ /* Destroy excluders */
+ cds_list_for_each_entry_safe(excluder_node, tmp_excluder_node,
+ &enabler->excluder_head, node) {
+ free(excluder_node);
+ }
+}
+
+ void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler *event_notifier_enabler)
+{
+ if (!event_notifier_enabler) {
+ return;
+ }
+
+ cds_list_del(&event_notifier_enabler->node);
+
+ lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler));
+
+ free(event_notifier_enabler);
+}
+
static
int lttng_enum_create(const struct lttng_enum_desc *desc,
struct lttng_session *session)
const char *enum_name = desc->name;
struct lttng_enum *_enum;
struct cds_hlist_head *head;
- struct cds_hlist_node *node;
int ret = 0;
size_t name_len = strlen(enum_name);
uint32_t hash;
int notify_socket;
+ /* Check if this enum is already registered for this session. */
hash = jhash(enum_name, name_len, 0);
head = &session->enums_ht.table[hash & (LTTNG_UST_ENUM_HT_SIZE - 1)];
- cds_hlist_for_each_entry(_enum, node, head, hlist) {
- assert(_enum->desc);
- if (!strncmp(_enum->desc->name, desc->name,
- LTTNG_UST_SYM_NAME_LEN - 1)) {
- ret = -EEXIST;
- goto exist;
- }
+
+ _enum = lttng_ust_enum_get_from_desc(session, desc);
+ if (_enum) {
+ ret = -EEXIST;
+ goto exist;
}
notify_socket = lttng_get_notify_socket(session->owner);
const struct lttng_enum_desc *enum_desc;
int ret;
- enum_desc = type->u.basic.enumeration.desc;
+ enum_desc = type->u.legacy.basic.enumeration.desc;
+ ret = lttng_enum_create(enum_desc, session);
+ if (ret && ret != -EEXIST) {
+ DBG("Unable to create enum error: (%d)", ret);
+ return ret;
+ }
+ break;
+ }
+ case atype_enum_nestable:
+ {
+ const struct lttng_enum_desc *enum_desc;
+ int ret;
+
+ enum_desc = type->u.enum_nestable.desc;
ret = lttng_enum_create(enum_desc, session);
if (ret && ret != -EEXIST) {
DBG("Unable to create enum error: (%d)", ret);
int ret;
tag_field_generic = lttng_ust_dynamic_type_tag_field();
- enum_desc = tag_field_generic->type.u.basic.enumeration.desc;
+ enum_desc = tag_field_generic->type.u.enum_nestable.desc;
ret = lttng_enum_create(enum_desc, session);
if (ret && ret != -EEXIST) {
DBG("Unable to create enum error: (%d)", ret);
/* Set transient enabler state to "enabled" */
session->tstate = 1;
+ /* We need to sync enablers with session before activation. */
+ lttng_session_sync_event_enablers(session);
+
/*
* Snapshot the number of events per channel to know the type of header
* we need to use.
ret = ustcomm_register_channel(notify_socket,
session,
session->objd,
- chan->objd,
+ chan->parent.objd,
nr_fields,
fields,
&chan_id,
}
}
- /* We need to sync enablers with session before activation. */
- lttng_session_sync_enablers(session);
-
/* Set atomically the state to "active" */
CMM_ACCESS_ONCE(session->active) = 1;
CMM_ACCESS_ONCE(session->been_active) = 1;
/* Set transient enabler state to "disabled" */
session->tstate = 0;
- lttng_session_sync_enablers(session);
+ lttng_session_sync_event_enablers(session);
end:
return ret;
}
-int lttng_channel_enable(struct lttng_channel *channel)
+int lttng_event_container_enable(struct lttng_event_container *container)
{
int ret = 0;
- if (channel->enabled) {
+ if (container->enabled) {
ret = -EBUSY;
goto end;
}
/* Set transient enabler state to "enabled" */
- channel->tstate = 1;
- lttng_session_sync_enablers(channel->session);
- /* Set atomically the state to "enabled" */
- CMM_ACCESS_ONCE(channel->enabled) = 1;
+ container->tstate = 1;
+ lttng_session_sync_event_enablers(container->session);
+ /* Atomically set the state to "enabled" */
+ switch (container->type) {
+ case LTTNG_EVENT_CONTAINER_CHANNEL:
+ {
+ struct lttng_channel *channel = caa_container_of(container,
+ struct lttng_channel, parent);
+
+ CMM_ACCESS_ONCE(channel->enabled) = 1; /* Backward compatibility */
+ break;
+ }
+ default:
+ break;
+ }
+ CMM_ACCESS_ONCE(container->enabled) = 1;
end:
return ret;
}
-int lttng_channel_disable(struct lttng_channel *channel)
+int lttng_event_container_disable(struct lttng_event_container *container)
{
int ret = 0;
- if (!channel->enabled) {
+ if (!container->enabled) {
ret = -EBUSY;
goto end;
}
- /* Set atomically the state to "disabled" */
- CMM_ACCESS_ONCE(channel->enabled) = 0;
+ /* Atomically set the state to "disabled" */
+ CMM_ACCESS_ONCE(container->enabled) = 0;
+ switch (container->type) {
+ case LTTNG_EVENT_CONTAINER_CHANNEL:
+ {
+ struct lttng_channel *channel = caa_container_of(container,
+ struct lttng_channel, parent);
+
+ CMM_ACCESS_ONCE(channel->enabled) = 0; /* Backward compatibility */
+ break;
+ }
+ default:
+ break;
+ }
/* Set transient enabler state to "enabled" */
- channel->tstate = 0;
- lttng_session_sync_enablers(channel->session);
+ container->tstate = 0;
+ lttng_session_sync_event_enablers(container->session);
end:
return ret;
}
+static inline
+struct cds_hlist_head *borrow_hash_table_bucket(
+ struct cds_hlist_head *hash_table,
+ unsigned int hash_table_size,
+ const char *name)
+{
+ size_t name_len;
+ uint32_t hash;
+
+ name_len = strlen(name);
+
+ hash = jhash(name, name_len, 0);
+ return &hash_table[hash & (hash_table_size - 1)];
+}
+
+static
+int format_event_key(char *key_string, const struct lttng_counter_key *key,
+ const char *full_name)
+{
+ const struct lttng_counter_key_dimension *dim;
+ size_t i, left = LTTNG_KEY_TOKEN_STRING_LEN_MAX;
+ char buf[LTTNG_UST_SYM_NAME_LEN];
+ const char *provider_name, *event_name;
+
+ if (lttng_split_provider_event_name(full_name, buf, &provider_name, &event_name))
+ return -EINVAL;
+ key_string[0] = '\0';
+ if (!key || !key->nr_dimensions)
+ return 0;
+ /* Currently event keys can only be specified on a single dimension. */
+ if (key->nr_dimensions != 1)
+ return -EINVAL;
+ dim = &key->key_dimensions[0];
+ for (i = 0; i < dim->nr_key_tokens; i++) {
+ const struct lttng_key_token *token = &dim->key_tokens[i];
+ size_t token_len;
+ const char *str;
+
+ switch (token->type) {
+ case LTTNG_KEY_TOKEN_STRING:
+ str = token->arg.string;
+ break;
+ case LTTNG_KEY_TOKEN_EVENT_NAME:
+ str = event_name;
+ break;
+ case LTTNG_KEY_TOKEN_PROVIDER_NAME:
+ str = provider_name;
+ break;
+ default:
+ return -EINVAL;
+ }
+ token_len = strlen(str);
+ if (token_len >= left)
+ return -EINVAL;
+ strcat(key_string, str);
+ left -= token_len;
+ }
+ return 0;
+}
+
+static
+bool match_event_token(struct lttng_event_container *container,
+ struct lttng_event *event, uint64_t token)
+{
+ if (container->coalesce_hits)
+ return true;
+ if (event->user_token == token)
+ return true;
+ return false;
+}
+
/*
* Supports event creation while tracing session is active.
*/
static
-int lttng_event_create(const struct lttng_event_desc *desc,
- struct lttng_channel *chan)
+int lttng_event_create(struct lttng_event_enabler *event_enabler,
+ const struct lttng_event_desc *event_desc,
+ const struct lttng_counter_key *key)
{
- const char *event_name = desc->name;
+ struct lttng_event_container *container = event_enabler->container;
struct lttng_event *event;
- struct lttng_session *session = chan->session;
- struct cds_hlist_head *head;
- struct cds_hlist_node *node;
+ struct lttng_session *session = container->session;
+ const char *event_name;
+ struct cds_hlist_head *name_head;
+ char key_string[LTTNG_KEY_TOKEN_STRING_LEN_MAX];
int ret = 0;
- size_t name_len = strlen(event_name);
- uint32_t hash;
int notify_socket, loglevel;
const char *uri;
- hash = jhash(event_name, name_len, 0);
- head = &chan->session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)];
- cds_hlist_for_each_entry(event, node, head, hlist) {
- assert(event->desc);
- if (!strncmp(event->desc->name, desc->name,
- LTTNG_UST_SYM_NAME_LEN - 1)
- && chan == event->chan) {
+ event_name = event_desc->name;
+ if (format_event_key(key_string, key, event_name)) {
+ ret = -EINVAL;
+ goto type_error;
+ }
+
+ name_head = borrow_hash_table_bucket(session->events_name_ht.table,
+ LTTNG_UST_EVENT_HT_SIZE, event_name);
+ cds_hlist_for_each_entry_2(event, name_head, name_hlist) {
+ bool same_event = false, same_container = false, same_key = false,
+ same_token = false;
+
+ WARN_ON_ONCE(!event->desc);
+ if (event_desc) {
+ if (event->desc == event_desc)
+ same_event = true;
+ } else {
+ if (!strcmp(event_name, event->desc->name))
+ same_event = true;
+ }
+ if (container == event->container) {
+ same_container = true;
+ if (match_event_token(container, event,
+ event_enabler->base.user_token))
+ same_token = true;
+ }
+ if (key_string[0] == '\0' || !strcmp(key_string, event->key))
+ same_key = true;
+ if (same_event && same_container && same_key && same_token) {
ret = -EEXIST;
goto exist;
}
goto socket_error;
}
- ret = lttng_create_all_event_enums(desc->nr_fields, desc->fields,
+ ret = lttng_create_all_event_enums(event_desc->nr_fields, event_desc->fields,
session);
if (ret < 0) {
DBG("Error (%d) adding enum to session", ret);
ret = -ENOMEM;
goto cache_error;
}
- event->chan = chan;
+ /* for backward compatibility */
+ event->chan = lttng_event_container_get_channel(container);
/* Event will be enabled by enabler sync. */
event->enabled = 0;
event->registered = 0;
- CDS_INIT_LIST_HEAD(&event->bytecode_runtime_head);
+ CDS_INIT_LIST_HEAD(&event->filter_bytecode_runtime_head);
CDS_INIT_LIST_HEAD(&event->enablers_ref_head);
- event->desc = desc;
+ event->desc = event_desc;
+ event->container = container;
+ strcpy(event->key, key_string);
+ if (!container->coalesce_hits)
+ event->user_token = event_enabler->base.user_token;
- if (desc->loglevel)
+ if (event_desc->loglevel)
loglevel = *(*event->desc->loglevel);
else
loglevel = TRACE_DEFAULT;
- if (desc->u.ext.model_emf_uri)
- uri = *(desc->u.ext.model_emf_uri);
+ if (event_desc->u.ext.model_emf_uri)
+ uri = *(event_desc->u.ext.model_emf_uri);
else
uri = NULL;
ret = ustcomm_register_event(notify_socket,
session,
session->objd,
- chan->objd,
- event_name,
+ container->objd,
+ event_desc->name,
loglevel,
- desc->signature,
- desc->nr_fields,
- desc->fields,
+ event_desc->signature,
+ event_desc->nr_fields,
+ event_desc->fields,
uri,
- &event->id);
+ event_enabler->base.user_token,
+ &event->id,
+ &event->counter_index);
if (ret < 0) {
DBG("Error (%d) registering event to sessiond", ret);
goto sessiond_register_error;
}
- /* Populate lttng_event structure before tracepoint registration. */
- cmm_smp_wmb();
- cds_list_add(&event->node, &chan->session->events_head);
- cds_hlist_add_head(&event->hlist, head);
+ cds_list_add(&event->node, &session->events_head);
+ cds_hlist_add_head(&event->name_hlist, name_head);
return 0;
sessiond_register_error:
create_enum_error:
socket_error:
exist:
+type_error:
+ return ret;
+}
+
+static
+int lttng_event_notifier_create(const struct lttng_event_desc *desc,
+ uint64_t token, uint64_t error_counter_index,
+ struct lttng_event_notifier_group *event_notifier_group)
+{
+ struct lttng_event_notifier *event_notifier;
+ struct cds_hlist_head *head;
+ int ret = 0;
+
+ /*
+ * Get the hashtable bucket the created lttng_event_notifier object
+ * should be inserted.
+ */
+ head = borrow_hash_table_bucket(
+ event_notifier_group->event_notifiers_ht.table,
+ LTTNG_UST_EVENT_NOTIFIER_HT_SIZE, desc->name);
+
+ event_notifier = zmalloc(sizeof(struct lttng_event_notifier));
+ if (!event_notifier) {
+ ret = -ENOMEM;
+ goto error;
+ }
+
+ event_notifier->group = event_notifier_group;
+ event_notifier->user_token = token;
+ event_notifier->error_counter_index = error_counter_index;
+
+ /* Event notifier will be enabled by enabler sync. */
+ event_notifier->enabled = 0;
+ event_notifier->registered = 0;
+
+ CDS_INIT_LIST_HEAD(&event_notifier->filter_bytecode_runtime_head);
+ CDS_INIT_LIST_HEAD(&event_notifier->capture_bytecode_runtime_head);
+ CDS_INIT_LIST_HEAD(&event_notifier->enablers_ref_head);
+ event_notifier->desc = desc;
+ event_notifier->notification_send = lttng_event_notifier_notification_send;
+
+ cds_list_add(&event_notifier->node,
+ &event_notifier_group->event_notifiers_head);
+ cds_hlist_add_head(&event_notifier->hlist, head);
+
+ return 0;
+
+error:
return ret;
}
+static
+void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier)
+{
+ struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref;
+
+ /* Remove from event_notifier list. */
+ cds_list_del(&event_notifier->node);
+ /* Remove from event_notifier hash table. */
+ cds_hlist_del(&event_notifier->hlist);
+
+ lttng_free_event_notifier_filter_runtime(event_notifier);
+
+ /* Free event_notifier enabler refs */
+ cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref,
+ &event_notifier->enablers_ref_head, node)
+ free(enabler_ref);
+ free(event_notifier);
+}
+
static
int lttng_desc_match_star_glob_enabler(const struct lttng_event_desc *desc,
struct lttng_enabler *enabler)
int loglevel = 0;
unsigned int has_loglevel = 0;
- assert(enabler->type == LTTNG_ENABLER_STAR_GLOB);
+ assert(enabler->format_type == LTTNG_ENABLER_FORMAT_STAR_GLOB);
if (!strutils_star_glob_match(enabler->event_param.name, SIZE_MAX,
desc->name, SIZE_MAX))
return 0;
int loglevel = 0;
unsigned int has_loglevel = 0;
- assert(enabler->type == LTTNG_ENABLER_EVENT);
+ assert(enabler->format_type == LTTNG_ENABLER_FORMAT_EVENT);
if (strcmp(desc->name, enabler->event_param.name))
return 0;
if (desc->loglevel) {
int lttng_desc_match_enabler(const struct lttng_event_desc *desc,
struct lttng_enabler *enabler)
{
- switch (enabler->type) {
- case LTTNG_ENABLER_STAR_GLOB:
+ switch (enabler->format_type) {
+ case LTTNG_ENABLER_FORMAT_STAR_GLOB:
{
struct lttng_ust_excluder_node *excluder;
}
return 1;
}
- case LTTNG_ENABLER_EVENT:
+ case LTTNG_ENABLER_FORMAT_EVENT:
return lttng_desc_match_event_enabler(desc, enabler);
default:
return -EINVAL;
}
static
-int lttng_event_match_enabler(struct lttng_event *event,
- struct lttng_enabler *enabler)
+bool lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler,
+ struct lttng_event *event)
+{
+ if (lttng_desc_match_enabler(event->desc,
+ lttng_event_enabler_as_enabler(event_enabler)) > 0
+ && event->container == event_enabler->container
+ && match_event_token(event->container, event, event_enabler->base.user_token))
+ return true;
+ else
+ return false;
+}
+
+static
+int lttng_event_notifier_enabler_match_event_notifier(
+ struct lttng_event_notifier_enabler *event_notifier_enabler,
+ struct lttng_event_notifier *event_notifier)
{
- if (lttng_desc_match_enabler(event->desc, enabler)
- && event->chan == enabler->chan)
+ bool desc_matches = lttng_desc_match_enabler(event_notifier->desc,
+ lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)) > 0;
+
+ if (desc_matches && event_notifier->group == event_notifier_enabler->group &&
+ event_notifier->user_token == event_notifier_enabler->base.user_token)
return 1;
else
return 0;
}
static
-struct lttng_enabler_ref * lttng_event_enabler_ref(struct lttng_event *event,
+struct lttng_enabler_ref *lttng_enabler_ref(
+ struct cds_list_head *enabler_ref_list,
struct lttng_enabler *enabler)
{
struct lttng_enabler_ref *enabler_ref;
- cds_list_for_each_entry(enabler_ref,
- &event->enablers_ref_head, node) {
+ cds_list_for_each_entry(enabler_ref, enabler_ref_list, node) {
if (enabler_ref->ref == enabler)
return enabler_ref;
}
* tracepoint probes.
*/
static
-void lttng_create_event_if_missing(struct lttng_enabler *enabler)
+void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler)
{
- struct lttng_session *session = enabler->chan->session;
struct lttng_probe_desc *probe_desc;
const struct lttng_event_desc *desc;
- struct lttng_event *event;
int i;
struct cds_list_head *probe_list;
*/
cds_list_for_each_entry(probe_desc, probe_list, head) {
for (i = 0; i < probe_desc->nr_events; i++) {
- int found = 0, ret;
- struct cds_hlist_head *head;
- struct cds_hlist_node *node;
- const char *event_name;
- size_t name_len;
- uint32_t hash;
+ int ret;
desc = probe_desc->event_desc[i];
- if (!lttng_desc_match_enabler(desc, enabler))
+ if (lttng_desc_match_enabler(desc,
+ lttng_event_enabler_as_enabler(event_enabler)) <= 0)
continue;
- event_name = desc->name;
- name_len = strlen(event_name);
- /*
- * Check if already created.
- */
- hash = jhash(event_name, name_len, 0);
- head = &session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)];
- cds_hlist_for_each_entry(event, node, head, hlist) {
- if (event->desc == desc
- && event->chan == enabler->chan)
- found = 1;
- }
- if (found)
+ /* Try to create an event for this event probe. */
+ ret = lttng_event_create(event_enabler,
+ probe_desc->event_desc[i],
+ &event_enabler->key);
+ /* Skip if event is already found. */
+ if (ret == -EEXIST)
continue;
-
- /*
- * We need to create an event for this
- * event probe.
- */
- ret = lttng_event_create(probe_desc->event_desc[i],
- enabler->chan);
if (ret) {
DBG("Unable to create event %s, error %d\n",
probe_desc->event_desc[i]->name, ret);
}
}
-/*
- * Create events associated with an enabler (if not already present),
- * and add backward reference from the event to the enabler.
- */
static
-int lttng_enabler_ref_events(struct lttng_enabler *enabler)
+void probe_provider_event_for_each(struct lttng_probe_desc *provider_desc,
+ void (*event_func)(struct lttng_session *session,
+ struct lttng_event *event),
+ void (*event_notifier_func)(struct lttng_event_notifier *event_notifier))
{
- struct lttng_session *session = enabler->chan->session;
- struct lttng_event *event;
+ struct cds_hlist_node *node, *tmp_node;
+ struct cds_list_head *sessionsp;
+ unsigned int i;
- /* First ensure that probe events are created for this enabler. */
- lttng_create_event_if_missing(enabler);
+ /* Get handle on list of sessions. */
+ sessionsp = _lttng_get_sessions();
- /* For each event matching enabler in session event list. */
- cds_list_for_each_entry(event, &session->events_head, node) {
- struct lttng_enabler_ref *enabler_ref;
+ /*
+ * Iterate over all events in the probe provider descriptions and
+ * sessions to queue the unregistration of the events.
+ */
+ for (i = 0; i < provider_desc->nr_events; i++) {
+ const struct lttng_event_desc *event_desc;
+ struct lttng_event_notifier_group *event_notifier_group;
+ struct lttng_event_notifier *event_notifier;
+ struct lttng_session *session;
+ struct cds_hlist_head *head;
+ struct lttng_event *event;
- if (!lttng_event_match_enabler(event, enabler))
- continue;
+ event_desc = provider_desc->event_desc[i];
- enabler_ref = lttng_event_enabler_ref(event, enabler);
- if (!enabler_ref) {
+ /*
+ * Iterate over all session to find the current event
+ * description.
+ */
+ cds_list_for_each_entry(session, sessionsp, node) {
+ /*
+ * Get the list of events in the hashtable bucket and
+ * iterate to find the event matching this descriptor.
+ */
+ head = borrow_hash_table_bucket(
+ session->events_name_ht.table,
+ LTTNG_UST_EVENT_HT_SIZE, event_desc->name);
+
+ cds_hlist_for_each_entry_safe(event, node, tmp_node, head, name_hlist) {
+ if (event_desc == event->desc) {
+ event_func(session, event);
+ break;
+ }
+ }
+ }
+
+ /*
+ * Iterate over all event_notifier groups to find the current event
+ * description.
+ */
+ cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) {
+ /*
+ * Get the list of event_notifiers in the hashtable bucket and
+ * iterate to find the event_notifier matching this
+ * descriptor.
+ */
+ head = borrow_hash_table_bucket(
+ event_notifier_group->event_notifiers_ht.table,
+ LTTNG_UST_EVENT_NOTIFIER_HT_SIZE, event_desc->name);
+
+ cds_hlist_for_each_entry_safe(event_notifier, node, tmp_node, head, hlist) {
+ if (event_desc == event_notifier->desc) {
+ event_notifier_func(event_notifier);
+ break;
+ }
+ }
+ }
+ }
+}
+
+static
+void _unregister_event(struct lttng_session *session,
+ struct lttng_event *event)
+{
+ _lttng_event_unregister(event);
+}
+
+static
+void _event_enum_destroy(struct lttng_session *session,
+ struct lttng_event *event)
+{
+ unsigned int i;
+
+ /* Destroy enums of the current event. */
+ for (i = 0; i < event->desc->nr_fields; i++) {
+ const struct lttng_enum_desc *enum_desc;
+ const struct lttng_event_field *field;
+ struct lttng_enum *curr_enum;
+
+ field = &(event->desc->fields[i]);
+ switch (field->type.atype) {
+ case atype_enum:
+ enum_desc = field->type.u.legacy.basic.enumeration.desc;
+ break;
+ case atype_enum_nestable:
+ enum_desc = field->type.u.enum_nestable.desc;
+ break;
+ default:
+ continue;
+ }
+
+ curr_enum = lttng_ust_enum_get_from_desc(session, enum_desc);
+ if (curr_enum) {
+ _lttng_enum_destroy(curr_enum);
+ }
+ }
+
+ /* Destroy event. */
+ _lttng_event_destroy(event);
+}
+
+/*
+ * Iterate over all the UST sessions to unregister and destroy all probes from
+ * the probe provider descriptor received as argument. Must me called with the
+ * ust_lock held.
+ */
+void lttng_probe_provider_unregister_events(
+ struct lttng_probe_desc *provider_desc)
+{
+ /*
+ * Iterate over all events in the probe provider descriptions and sessions
+ * to queue the unregistration of the events.
+ */
+ probe_provider_event_for_each(provider_desc, _unregister_event,
+ _lttng_event_notifier_unregister);
+
+ /* Wait for grace period. */
+ lttng_ust_synchronize_trace();
+ /* Prune the unregistration queue. */
+ __tracepoint_probe_prune_release_queue();
+
+ /*
+ * It is now safe to destroy the events and remove them from the event list
+ * and hashtables.
+ */
+ probe_provider_event_for_each(provider_desc, _event_enum_destroy,
+ _lttng_event_notifier_destroy);
+}
+
+/*
+ * Create events associated with an event enabler (if not already present),
+ * and add backward reference from the event to the enabler.
+ */
+static
+int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler)
+{
+ struct lttng_session *session = event_enabler->container->session;
+ struct lttng_event *event;
+
+ if (!lttng_event_enabler_as_enabler(event_enabler)->enabled)
+ goto end;
+
+ /* First ensure that probe events are created for this enabler. */
+ lttng_create_event_if_missing(event_enabler);
+
+ /* For each event matching enabler in session event list. */
+ cds_list_for_each_entry(event, &session->events_head, node) {
+ struct lttng_enabler_ref *enabler_ref;
+
+ if (!lttng_event_enabler_match_event(event_enabler, event))
+ continue;
+
+ enabler_ref = lttng_enabler_ref(&event->enablers_ref_head,
+ lttng_event_enabler_as_enabler(event_enabler));
+ if (!enabler_ref) {
/*
* If no backward ref, create it.
* Add backward ref from event to enabler.
enabler_ref = zmalloc(sizeof(*enabler_ref));
if (!enabler_ref)
return -ENOMEM;
- enabler_ref->ref = enabler;
+ enabler_ref->ref = lttng_event_enabler_as_enabler(
+ event_enabler);
cds_list_add(&enabler_ref->node,
&event->enablers_ref_head);
}
/*
* Link filter bytecodes if not linked yet.
*/
- lttng_enabler_event_link_bytecode(event, enabler);
+ lttng_enabler_link_bytecode(event->desc,
+ &session->ctx,
+ &event->filter_bytecode_runtime_head,
+ <tng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head);
/* TODO: merge event context. */
}
+end:
return 0;
}
struct lttng_session *session;
cds_list_for_each_entry(session, &sessions, node) {
- lttng_session_lazy_sync_enablers(session);
+ lttng_session_lazy_sync_event_enablers(session);
+ }
+ return 0;
+}
+
+int lttng_fix_pending_event_notifiers(void)
+{
+ struct lttng_event_notifier_group *event_notifier_group;
+
+ cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) {
+ lttng_event_notifier_group_sync_enablers(event_notifier_group);
}
return 0;
}
{
struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref;
+ /* Remove from event list. */
cds_list_del(&event->node);
+ /* Remove from event hash table. */
+ cds_hlist_del(&event->name_hlist);
+
lttng_destroy_context(event->ctx);
lttng_free_event_filter_runtime(event);
/* Free event enabler refs */
void _lttng_enum_destroy(struct lttng_enum *_enum)
{
cds_list_del(&_enum->node);
+ cds_hlist_del(&_enum->hlist);
free(_enum);
}
lttng_session_destroy(session);
}
+static
+int copy_counter_key(struct lttng_counter_key *key,
+ const struct lttng_ust_counter_key *key_param)
+{
+ size_t i, j, nr_dimensions;
+
+ nr_dimensions = key_param->nr_dimensions;
+ if (nr_dimensions > LTTNG_COUNTER_DIMENSION_MAX)
+ return -EINVAL;
+ key->nr_dimensions = nr_dimensions;
+ for (i = 0; i < nr_dimensions; i++) {
+ const struct lttng_ust_counter_key_dimension *udim =
+ &key_param->key_dimensions[i];
+ struct lttng_counter_key_dimension *dim =
+ &key->key_dimensions[i];
+ size_t nr_key_tokens;
+
+ nr_key_tokens = udim->nr_key_tokens;
+ if (!nr_key_tokens || nr_key_tokens > LTTNG_NR_KEY_TOKEN)
+ return -EINVAL;
+ dim->nr_key_tokens = nr_key_tokens;
+ for (j = 0; j < nr_key_tokens; j++) {
+ const struct lttng_ust_key_token *utoken =
+ &udim->key_tokens[j];
+ struct lttng_key_token *token =
+ &dim->key_tokens[j];
+
+ switch (utoken->type) {
+ case LTTNG_UST_KEY_TOKEN_STRING:
+ {
+ size_t len;
+
+ token->type = LTTNG_KEY_TOKEN_STRING;
+ len = strnlen(utoken->arg.string, LTTNG_KEY_TOKEN_STRING_LEN_MAX);
+ if (!len || len >= LTTNG_KEY_TOKEN_STRING_LEN_MAX)
+ return -EINVAL;
+ strcpy(token->arg.string, utoken->arg.string);
+ break;
+ }
+ case LTTNG_UST_KEY_TOKEN_EVENT_NAME:
+ token->type = LTTNG_KEY_TOKEN_EVENT_NAME;
+ break;
+ case LTTNG_UST_KEY_TOKEN_PROVIDER_NAME:
+ token->type = LTTNG_KEY_TOKEN_PROVIDER_NAME;
+ break;
+ default:
+ return -EINVAL;
+ }
+ }
+ }
+ return 0;
+}
+
/*
* Enabler management.
*/
-struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type,
+struct lttng_event_enabler *lttng_event_enabler_create(
+ enum lttng_enabler_format_type format_type,
struct lttng_ust_event *event_param,
- struct lttng_channel *chan)
+ const struct lttng_ust_counter_key *key,
+ struct lttng_event_container *container)
{
- struct lttng_enabler *enabler;
+ struct lttng_event_enabler *event_enabler;
- enabler = zmalloc(sizeof(*enabler));
- if (!enabler)
+ event_enabler = zmalloc(sizeof(*event_enabler));
+ if (!event_enabler)
return NULL;
- enabler->type = type;
- CDS_INIT_LIST_HEAD(&enabler->filter_bytecode_head);
- CDS_INIT_LIST_HEAD(&enabler->excluder_head);
- memcpy(&enabler->event_param, event_param,
- sizeof(enabler->event_param));
- enabler->chan = chan;
+ event_enabler->base.format_type = format_type;
+ event_enabler->base.user_token = event_param->token;
+ CDS_INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head);
+ CDS_INIT_LIST_HEAD(&event_enabler->base.excluder_head);
+ memcpy(&event_enabler->base.event_param, event_param,
+ sizeof(event_enabler->base.event_param));
+ event_enabler->container = container;
+ if (key) {
+ if (copy_counter_key(&event_enabler->key, key))
+ return NULL;
+ }
/* ctx left NULL */
- enabler->enabled = 0;
- cds_list_add(&enabler->node, &enabler->chan->session->enablers_head);
- lttng_session_lazy_sync_enablers(enabler->chan->session);
- return enabler;
+ event_enabler->base.enabled = 0;
+ cds_list_add(&event_enabler->node, &event_enabler->container->session->enablers_head);
+ lttng_session_lazy_sync_event_enablers(event_enabler->container->session);
+
+ return event_enabler;
+}
+
+struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create(
+ struct lttng_event_notifier_group *event_notifier_group,
+ enum lttng_enabler_format_type format_type,
+ struct lttng_ust_event_notifier *event_notifier_param)
+{
+ struct lttng_event_notifier_enabler *event_notifier_enabler;
+
+ event_notifier_enabler = zmalloc(sizeof(*event_notifier_enabler));
+ if (!event_notifier_enabler)
+ return NULL;
+ event_notifier_enabler->base.format_type = format_type;
+ CDS_INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head);
+ CDS_INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head);
+ CDS_INIT_LIST_HEAD(&event_notifier_enabler->base.excluder_head);
+
+ event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index;
+ event_notifier_enabler->num_captures = 0;
+
+ event_notifier_enabler->base.user_token = event_notifier_param->event.token;
+ memcpy(&event_notifier_enabler->base.event_param.name,
+ event_notifier_param->event.name,
+ sizeof(event_notifier_enabler->base.event_param.name));
+ event_notifier_enabler->base.event_param.instrumentation =
+ event_notifier_param->event.instrumentation;
+ event_notifier_enabler->base.event_param.loglevel =
+ event_notifier_param->event.loglevel;
+ event_notifier_enabler->base.event_param.loglevel_type =
+ event_notifier_param->event.loglevel_type;
+
+ event_notifier_enabler->base.enabled = 0;
+ event_notifier_enabler->group = event_notifier_group;
+
+ cds_list_add(&event_notifier_enabler->node,
+ &event_notifier_group->enablers_head);
+
+ lttng_event_notifier_group_sync_enablers(event_notifier_group);
+
+ return event_notifier_enabler;
}
-int lttng_enabler_enable(struct lttng_enabler *enabler)
+int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler)
{
- enabler->enabled = 1;
- lttng_session_lazy_sync_enablers(enabler->chan->session);
+ lttng_event_enabler_as_enabler(event_enabler)->enabled = 1;
+ lttng_session_lazy_sync_event_enablers(event_enabler->container->session);
+
return 0;
}
-int lttng_enabler_disable(struct lttng_enabler *enabler)
+int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler)
+{
+ lttng_event_enabler_as_enabler(event_enabler)->enabled = 0;
+ lttng_session_lazy_sync_event_enablers(event_enabler->container->session);
+
+ return 0;
+}
+
+static
+void _lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler,
+ struct lttng_ust_bytecode_node **bytecode)
+{
+ (*bytecode)->enabler = enabler;
+ cds_list_add_tail(&(*bytecode)->node, &enabler->filter_bytecode_head);
+ /* Take ownership of bytecode */
+ *bytecode = NULL;
+}
+
+int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler,
+ struct lttng_ust_bytecode_node **bytecode)
{
- enabler->enabled = 0;
- lttng_session_lazy_sync_enablers(enabler->chan->session);
+ _lttng_enabler_attach_filter_bytecode(
+ lttng_event_enabler_as_enabler(event_enabler), bytecode);
+
+ lttng_session_lazy_sync_event_enablers(event_enabler->container->session);
return 0;
}
-int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler,
- struct lttng_ust_filter_bytecode_node *bytecode)
+static
+void _lttng_enabler_attach_exclusion(struct lttng_enabler *enabler,
+ struct lttng_ust_excluder_node **excluder)
{
- bytecode->enabler = enabler;
- cds_list_add_tail(&bytecode->node, &enabler->filter_bytecode_head);
- lttng_session_lazy_sync_enablers(enabler->chan->session);
+ (*excluder)->enabler = enabler;
+ cds_list_add_tail(&(*excluder)->node, &enabler->excluder_head);
+ /* Take ownership of excluder */
+ *excluder = NULL;
+}
+
+int lttng_event_enabler_attach_exclusion(struct lttng_event_enabler *event_enabler,
+ struct lttng_ust_excluder_node **excluder)
+{
+ _lttng_enabler_attach_exclusion(
+ lttng_event_enabler_as_enabler(event_enabler), excluder);
+
+ lttng_session_lazy_sync_event_enablers(event_enabler->container->session);
return 0;
}
-int lttng_enabler_attach_exclusion(struct lttng_enabler *enabler,
- struct lttng_ust_excluder_node *excluder)
+int lttng_event_notifier_enabler_enable(
+ struct lttng_event_notifier_enabler *event_notifier_enabler)
{
- excluder->enabler = enabler;
- cds_list_add_tail(&excluder->node, &enabler->excluder_head);
- lttng_session_lazy_sync_enablers(enabler->chan->session);
+ lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1;
+ lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
+
+ return 0;
+}
+
+int lttng_event_notifier_enabler_disable(
+ struct lttng_event_notifier_enabler *event_notifier_enabler)
+{
+ lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0;
+ lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
+
+ return 0;
+}
+
+int lttng_event_notifier_enabler_attach_filter_bytecode(
+ struct lttng_event_notifier_enabler *event_notifier_enabler,
+ struct lttng_ust_bytecode_node **bytecode)
+{
+ _lttng_enabler_attach_filter_bytecode(
+ lttng_event_notifier_enabler_as_enabler(event_notifier_enabler),
+ bytecode);
+
+ lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
+ return 0;
+}
+
+int lttng_event_notifier_enabler_attach_capture_bytecode(
+ struct lttng_event_notifier_enabler *event_notifier_enabler,
+ struct lttng_ust_bytecode_node **bytecode)
+{
+ (*bytecode)->enabler = lttng_event_notifier_enabler_as_enabler(
+ event_notifier_enabler);
+ cds_list_add_tail(&(*bytecode)->node,
+ &event_notifier_enabler->capture_bytecode_head);
+ /* Take ownership of bytecode */
+ *bytecode = NULL;
+ event_notifier_enabler->num_captures++;
+
+ lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
+ return 0;
+}
+
+int lttng_event_notifier_enabler_attach_exclusion(
+ struct lttng_event_notifier_enabler *event_notifier_enabler,
+ struct lttng_ust_excluder_node **excluder)
+{
+ _lttng_enabler_attach_exclusion(
+ lttng_event_notifier_enabler_as_enabler(event_notifier_enabler),
+ excluder);
+
+ lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
return 0;
}
case LTTNG_UST_CONTEXT_APP_CONTEXT:
return lttng_ust_add_app_context_to_ctx_rcu(uargs->app_context.ctxname,
ctx);
+ case LTTNG_UST_CONTEXT_CGROUP_NS:
+ return lttng_add_cgroup_ns_to_ctx(ctx);
+ case LTTNG_UST_CONTEXT_IPC_NS:
+ return lttng_add_ipc_ns_to_ctx(ctx);
+ case LTTNG_UST_CONTEXT_MNT_NS:
+ return lttng_add_mnt_ns_to_ctx(ctx);
+ case LTTNG_UST_CONTEXT_NET_NS:
+ return lttng_add_net_ns_to_ctx(ctx);
+ case LTTNG_UST_CONTEXT_PID_NS:
+ return lttng_add_pid_ns_to_ctx(ctx);
+ case LTTNG_UST_CONTEXT_TIME_NS:
+ return lttng_add_time_ns_to_ctx(ctx);
+ case LTTNG_UST_CONTEXT_USER_NS:
+ return lttng_add_user_ns_to_ctx(ctx);
+ case LTTNG_UST_CONTEXT_UTS_NS:
+ return lttng_add_uts_ns_to_ctx(ctx);
+ case LTTNG_UST_CONTEXT_VUID:
+ return lttng_add_vuid_to_ctx(ctx);
+ case LTTNG_UST_CONTEXT_VEUID:
+ return lttng_add_veuid_to_ctx(ctx);
+ case LTTNG_UST_CONTEXT_VSUID:
+ return lttng_add_vsuid_to_ctx(ctx);
+ case LTTNG_UST_CONTEXT_VGID:
+ return lttng_add_vgid_to_ctx(ctx);
+ case LTTNG_UST_CONTEXT_VEGID:
+ return lttng_add_vegid_to_ctx(ctx);
+ case LTTNG_UST_CONTEXT_VSGID:
+ return lttng_add_vsgid_to_ctx(ctx);
default:
return -EINVAL;
}
}
-int lttng_enabler_attach_context(struct lttng_enabler *enabler,
+int lttng_event_enabler_attach_context(struct lttng_event_enabler *enabler,
struct lttng_ust_context *context_param)
{
-#if 0 // disabled for now.
- struct lttng_session *session = enabler->chan->session;
- int ret;
-
- ret = lttng_attach_context(context_param, &enabler->ctx,
- session);
- if (ret)
- return ret;
- lttng_session_lazy_sync_enablers(enabler->chan->session);
-#endif
return -ENOSYS;
}
-static
-void lttng_enabler_destroy(struct lttng_enabler *enabler)
+void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler)
{
- struct lttng_ust_filter_bytecode_node *filter_node, *tmp_filter_node;
- struct lttng_ust_excluder_node *excluder_node, *tmp_excluder_node;
-
- /* Destroy filter bytecode */
- cds_list_for_each_entry_safe(filter_node, tmp_filter_node,
- &enabler->filter_bytecode_head, node) {
- free(filter_node);
- }
-
- /* Destroy excluders */
- cds_list_for_each_entry_safe(excluder_node, tmp_excluder_node,
- &enabler->excluder_head, node) {
- free(excluder_node);
+ if (!event_enabler) {
+ return;
}
+ cds_list_del(&event_enabler->node);
- /* Destroy contexts */
- lttng_destroy_context(enabler->ctx);
+ lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler));
- cds_list_del(&enabler->node);
- free(enabler);
+ lttng_destroy_context(event_enabler->ctx);
+ free(event_enabler);
}
/*
- * lttng_session_sync_enablers should be called just before starting a
+ * lttng_session_sync_event_enablers should be called just before starting a
* session.
*/
static
-void lttng_session_sync_enablers(struct lttng_session *session)
+void lttng_session_sync_event_enablers(struct lttng_session *session)
{
- struct lttng_enabler *enabler;
+ struct lttng_event_enabler *event_enabler;
struct lttng_event *event;
- cds_list_for_each_entry(enabler, &session->enablers_head, node)
- lttng_enabler_ref_events(enabler);
+ cds_list_for_each_entry(event_enabler, &session->enablers_head, node)
+ lttng_event_enabler_ref_events(event_enabler);
/*
* For each event, if at least one of its enablers is enabled,
* and its channel and session transient states are enabled, we
* intesection of session and channel transient enable
* states.
*/
- enabled = enabled && session->tstate && event->chan->tstate;
+ enabled = enabled && session->tstate && event->container->tstate;
CMM_STORE_SHARED(event->enabled, enabled);
/*
/* Enable filters */
cds_list_for_each_entry(runtime,
- &event->bytecode_runtime_head, node) {
- lttng_filter_sync_state(runtime);
+ &event->filter_bytecode_runtime_head, node) {
+ lttng_bytecode_filter_sync_state(runtime);
+ }
+ }
+ __tracepoint_probe_prune_release_queue();
+}
+
+/* Support for event notifier is introduced by probe provider major version 2. */
+static
+bool lttng_ust_probe_supports_event_notifier(struct lttng_probe_desc *probe_desc)
+{
+ return probe_desc->major >= 2;
+}
+
+static
+void lttng_create_event_notifier_if_missing(
+ struct lttng_event_notifier_enabler *event_notifier_enabler)
+{
+ struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group;
+ struct lttng_probe_desc *probe_desc;
+ struct cds_list_head *probe_list;
+ int i;
+
+ probe_list = lttng_get_probe_list_head();
+
+ cds_list_for_each_entry(probe_desc, probe_list, head) {
+ for (i = 0; i < probe_desc->nr_events; i++) {
+ int ret;
+ bool found = false;
+ const struct lttng_event_desc *desc;
+ struct lttng_event_notifier *event_notifier;
+ struct cds_hlist_head *head;
+ struct cds_hlist_node *node;
+
+ desc = probe_desc->event_desc[i];
+
+ if (lttng_desc_match_enabler(desc,
+ lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)) <= 0)
+ continue;
+
+ /*
+ * Given the current event_notifier group, get the bucket that
+ * the target event_notifier would be if it was already
+ * created.
+ */
+ head = borrow_hash_table_bucket(
+ event_notifier_group->event_notifiers_ht.table,
+ LTTNG_UST_EVENT_NOTIFIER_HT_SIZE, desc->name);
+
+ cds_hlist_for_each_entry(event_notifier, node, head, hlist) {
+ /*
+ * Check if event_notifier already exists by checking
+ * if the event_notifier and enabler share the same
+ * description and id.
+ */
+ if (event_notifier->desc == desc &&
+ event_notifier->user_token == event_notifier_enabler->base.user_token) {
+ found = true;
+ break;
+ }
+ }
+
+ if (found)
+ continue;
+
+ /* Check that the probe supports event notifiers, else report the error. */
+ if (!lttng_ust_probe_supports_event_notifier(probe_desc)) {
+ ERR("Probe \"%s\" contains event \"%s\" which matches an enabled event notifier, "
+ "but its version (%u.%u) is too old and does not implement event notifiers. "
+ "It needs to be recompiled against a newer version of LTTng-UST, otherwise "
+ "this event will not generate any notification.",
+ probe_desc->provider,
+ desc->name,
+ probe_desc->major,
+ probe_desc->minor);
+ continue;
+ }
+ /*
+ * We need to create a event_notifier for this event probe.
+ */
+ ret = lttng_event_notifier_create(desc,
+ event_notifier_enabler->base.user_token,
+ event_notifier_enabler->error_counter_index,
+ event_notifier_group);
+ if (ret) {
+ DBG("Unable to create event_notifier %s, error %d\n",
+ probe_desc->event_desc[i]->name, ret);
+ }
+ }
+ }
+}
+
+/*
+ * Create event_notifiers associated with a event_notifier enabler (if not already present).
+ */
+static
+int lttng_event_notifier_enabler_ref_event_notifiers(
+ struct lttng_event_notifier_enabler *event_notifier_enabler)
+{
+ struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group;
+ struct lttng_event_notifier *event_notifier;
+
+ /*
+ * Only try to create event_notifiers for enablers that are enabled, the user
+ * might still be attaching filter or exclusion to the
+ * event_notifier_enabler.
+ */
+ if (!lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled)
+ goto end;
+
+ /* First, ensure that probe event_notifiers are created for this enabler. */
+ lttng_create_event_notifier_if_missing(event_notifier_enabler);
+
+ /* Link the created event_notifier with its associated enabler. */
+ cds_list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, node) {
+ struct lttng_enabler_ref *enabler_ref;
+
+ if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier))
+ continue;
+
+ enabler_ref = lttng_enabler_ref(&event_notifier->enablers_ref_head,
+ lttng_event_notifier_enabler_as_enabler(event_notifier_enabler));
+ if (!enabler_ref) {
+ /*
+ * If no backward ref, create it.
+ * Add backward ref from event_notifier to enabler.
+ */
+ enabler_ref = zmalloc(sizeof(*enabler_ref));
+ if (!enabler_ref)
+ return -ENOMEM;
+
+ enabler_ref->ref = lttng_event_notifier_enabler_as_enabler(
+ event_notifier_enabler);
+ cds_list_add(&enabler_ref->node,
+ &event_notifier->enablers_ref_head);
+ }
+
+ /*
+ * Link filter bytecodes if not linked yet.
+ */
+ lttng_enabler_link_bytecode(event_notifier->desc,
+ &event_notifier_group->ctx,
+ &event_notifier->filter_bytecode_runtime_head,
+ <tng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head);
+
+ /*
+ * Link capture bytecodes if not linked yet.
+ */
+ lttng_enabler_link_bytecode(event_notifier->desc,
+ &event_notifier_group->ctx, &event_notifier->capture_bytecode_runtime_head,
+ &event_notifier_enabler->capture_bytecode_head);
+
+ event_notifier->num_captures = event_notifier_enabler->num_captures;
+ }
+end:
+ return 0;
+}
+
+static
+void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group)
+{
+ struct lttng_event_notifier_enabler *event_notifier_enabler;
+ struct lttng_event_notifier *event_notifier;
+
+ cds_list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node)
+ lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler);
+
+ /*
+ * For each event_notifier, if at least one of its enablers is enabled,
+ * we enable the event_notifier, else we disable it.
+ */
+ cds_list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, node) {
+ struct lttng_enabler_ref *enabler_ref;
+ struct lttng_bytecode_runtime *runtime;
+ int enabled = 0, has_enablers_without_bytecode = 0;
+
+ /* Enable event_notifiers */
+ cds_list_for_each_entry(enabler_ref,
+ &event_notifier->enablers_ref_head, node) {
+ if (enabler_ref->ref->enabled) {
+ enabled = 1;
+ break;
+ }
+ }
+
+ CMM_STORE_SHARED(event_notifier->enabled, enabled);
+ /*
+ * Sync tracepoint registration with event_notifier enabled
+ * state.
+ */
+ if (enabled) {
+ if (!event_notifier->registered)
+ register_event_notifier(event_notifier);
+ } else {
+ if (event_notifier->registered)
+ unregister_event_notifier(event_notifier);
+ }
+
+ /* Check if has enablers without bytecode enabled */
+ cds_list_for_each_entry(enabler_ref,
+ &event_notifier->enablers_ref_head, node) {
+ if (enabler_ref->ref->enabled
+ && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) {
+ has_enablers_without_bytecode = 1;
+ break;
+ }
+ }
+ event_notifier->has_enablers_without_bytecode =
+ has_enablers_without_bytecode;
+
+ /* Enable filters */
+ cds_list_for_each_entry(runtime,
+ &event_notifier->filter_bytecode_runtime_head, node) {
+ lttng_bytecode_filter_sync_state(runtime);
+ }
+
+ /* Enable captures. */
+ cds_list_for_each_entry(runtime,
+ &event_notifier->capture_bytecode_runtime_head, node) {
+ lttng_bytecode_capture_sync_state(runtime);
}
}
__tracepoint_probe_prune_release_queue();
* "lazy" sync means we only sync if required.
*/
static
-void lttng_session_lazy_sync_enablers(struct lttng_session *session)
+void lttng_session_lazy_sync_event_enablers(struct lttng_session *session)
{
/* We can skip if session is not active */
if (!session->active)
return;
- lttng_session_sync_enablers(session);
+ lttng_session_sync_event_enablers(session);
}
/*
}
}
}
+
+/*
+ * Update all event_notifier groups with the given app context.
+ * Called with ust lock held.
+ * This is invoked when an application context gets loaded/unloaded. It
+ * ensures the context callbacks are in sync with the application
+ * context (either app context callbacks, or dummy callbacks).
+ */
+void lttng_ust_context_set_event_notifier_group_provider(const char *name,
+ size_t (*get_size)(struct lttng_ctx_field *field, size_t offset),
+ void (*record)(struct lttng_ctx_field *field,
+ struct lttng_ust_lib_ring_buffer_ctx *ctx,
+ struct lttng_channel *chan),
+ void (*get_value)(struct lttng_ctx_field *field,
+ struct lttng_ctx_value *value))
+{
+ struct lttng_event_notifier_group *event_notifier_group;
+
+ cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) {
+ int ret;
+
+ ret = lttng_ust_context_set_provider_rcu(
+ &event_notifier_group->ctx,
+ name, get_size, record, get_value);
+ if (ret)
+ abort();
+ }
+}
projects / deliverable / lttng-ust.git / blobdiff