X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=liblttng-ust%2Flttng-events.c;h=b61a2293f4a8a83039f3a645da09e9fb60cab479;hb=6ba6fd60507f8e045bdc4f1be14e9d99c6a15f7f;hp=eb85b50d24e4e09ec128cf0ebd8f407e8f293623;hpb=c785c634a51956094130218c2bffeff32756cb69;p=lttng-ust.git diff --git a/liblttng-ust/lttng-events.c b/liblttng-ust/lttng-events.c index eb85b50d..b61a2293 100644 --- a/liblttng-ust/lttng-events.c +++ b/liblttng-ust/lttng-events.c @@ -1,63 +1,64 @@ /* - * lttng-events.c - * - * Holds LTTng per-session event registry. + * SPDX-License-Identifier: LGPL-2.1-only * * Copyright (C) 2010-2012 Mathieu Desnoyers * - * 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 -#include -#include -#include +#include #include +#include +#include #include #include #include #include #include #include +#include +#include +#include #include -#include "clock.h" -#include +#include #include +#include +#include #include -#include #include #include #include -#include +#include #include #include +#include +#include +#include #include "error.h" #include "compat.h" #include "lttng-ust-uuid.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 "../libringbuffer/frontend_types.h" +#include "../libringbuffer/frontend.h" +#include "../libcounter/counter.h" #include "jhash.h" +#include +#include "context-provider-internal.h" /* * All operations within this file are called by the communication @@ -65,31 +66,51 @@ */ static CDS_LIST_HEAD(sessions); +static CDS_LIST_HEAD(event_notifier_groups); -struct cds_list_head *_lttng_get_sessions(void) +struct cds_list_head *lttng_get_sessions(void) { return &sessions; } -static void _lttng_event_destroy(struct lttng_event *event); +static void _lttng_event_destroy(struct lttng_ust_event_common *event); 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_ust_session *session); +static +void lttng_session_sync_event_enablers(struct lttng_ust_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); +bool lttng_ust_validate_event_name(const struct lttng_ust_event_desc *desc) +{ + if (strlen(desc->probe_desc->provider_name) + 1 + + strlen(desc->event_name) >= LTTNG_UST_ABI_SYM_NAME_LEN) + return false; + return true; +} + +void lttng_ust_format_event_name(const struct lttng_ust_event_desc *desc, + char *name) +{ + strcpy(name, desc->probe_desc->provider_name); + strcat(name, ":"); + strcat(name, desc->event_name); +} + /* * Called with ust lock held. */ int lttng_session_active(void) { - struct lttng_session *iter; + struct lttng_ust_session_private *iter; cds_list_for_each_entry(iter, &sessions, node) { - if (iter->active) + if (iter->pub->active) return 1; } return 0; @@ -98,25 +119,25 @@ int lttng_session_active(void) static int lttng_loglevel_match(int loglevel, unsigned int has_loglevel, - enum lttng_ust_loglevel_type req_type, + enum lttng_ust_abi_loglevel_type req_type, int req_loglevel) { if (!has_loglevel) loglevel = TRACE_DEFAULT; switch (req_type) { - case LTTNG_UST_LOGLEVEL_RANGE: + case LTTNG_UST_ABI_LOGLEVEL_RANGE: if (loglevel <= req_loglevel || (req_loglevel == -1 && loglevel <= TRACE_DEBUG)) return 1; else return 0; - case LTTNG_UST_LOGLEVEL_SINGLE: + case LTTNG_UST_ABI_LOGLEVEL_SINGLE: if (loglevel == req_loglevel || (req_loglevel == -1 && loglevel <= TRACE_DEBUG)) return 1; else return 0; - case LTTNG_UST_LOGLEVEL_ALL: + case LTTNG_UST_ABI_LOGLEVEL_ALL: default: if (loglevel <= TRACE_DEBUG) return 1; @@ -125,124 +146,430 @@ int lttng_loglevel_match(int loglevel, } } -void synchronize_trace(void) +struct lttng_ust_session *lttng_session_create(void) { - synchronize_rcu(); -} - -struct lttng_session *lttng_session_create(void) -{ - struct lttng_session *session; + struct lttng_ust_session *session; + struct lttng_ust_session_private *session_priv; int i; - session = zmalloc(sizeof(struct lttng_session)); + session = zmalloc(sizeof(struct lttng_ust_session)); if (!session) return NULL; - CDS_INIT_LIST_HEAD(&session->chan_head); - CDS_INIT_LIST_HEAD(&session->events_head); - CDS_INIT_LIST_HEAD(&session->enums_head); - CDS_INIT_LIST_HEAD(&session->enablers_head); + session->struct_size = sizeof(struct lttng_ust_session); + session_priv = zmalloc(sizeof(struct lttng_ust_session_private)); + if (!session_priv) { + free(session); + return NULL; + } + session->priv = session_priv; + session_priv->pub = session; + if (lttng_context_init_all(&session->priv->ctx)) { + free(session_priv); + free(session); + return NULL; + } + CDS_INIT_LIST_HEAD(&session->priv->chan_head); + CDS_INIT_LIST_HEAD(&session->priv->events_head); + CDS_INIT_LIST_HEAD(&session->priv->enums_head); + CDS_INIT_LIST_HEAD(&session->priv->enablers_head); for (i = 0; i < LTTNG_UST_EVENT_HT_SIZE; i++) - CDS_INIT_HLIST_HEAD(&session->events_ht.table[i]); + CDS_INIT_HLIST_HEAD(&session->priv->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); + CDS_INIT_HLIST_HEAD(&session->priv->enums_ht.table[i]); + cds_list_add(&session->priv->node, &sessions); return session; } +struct lttng_counter *lttng_ust_counter_create( + const char *counter_transport_name, + size_t number_dimensions, const struct lttng_counter_dimension *dimensions) +{ + 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, dimensions, 0, + -1, 0, NULL, false); + if (!counter->counter) { + goto create_error; + } + + 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_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. */ static -void _lttng_channel_unmap(struct lttng_channel *lttng_chan) +void _lttng_channel_unmap(struct lttng_ust_channel_buffer *lttng_chan) { - struct channel *chan; + struct lttng_ust_lib_ring_buffer_channel *chan; struct lttng_ust_shm_handle *handle; - cds_list_del(<tng_chan->node); - lttng_destroy_context(lttng_chan->ctx); - chan = lttng_chan->chan; - handle = lttng_chan->handle; - /* - * note: lttng_chan is private data contained within handle. It - * will be freed along with the handle. - */ + cds_list_del(<tng_chan->priv->node); + lttng_destroy_context(lttng_chan->priv->ctx); + chan = lttng_chan->priv->rb_chan; + handle = chan->handle; channel_destroy(chan, handle, 0); + free(lttng_chan->parent); + free(lttng_chan->priv); + free(lttng_chan); } static -void register_event(struct lttng_event *event) +void register_event(struct lttng_ust_event_common *event) { int ret; - const struct lttng_event_desc *desc; + const struct lttng_ust_event_desc *desc; + char name[LTTNG_UST_ABI_SYM_NAME_LEN]; - assert(event->registered == 0); - desc = event->desc; - ret = __tracepoint_probe_register(desc->name, + assert(event->priv->registered == 0); + desc = event->priv->desc; + lttng_ust_format_event_name(desc, name); + ret = lttng_ust_tp_probe_register_queue_release(name, desc->probe_callback, event, desc->signature); WARN_ON_ONCE(ret); if (!ret) - event->registered = 1; + event->priv->registered = 1; } static -void unregister_event(struct lttng_event *event) +void unregister_event(struct lttng_ust_event_common *event) { int ret; - const struct lttng_event_desc *desc; + const struct lttng_ust_event_desc *desc; + char name[LTTNG_UST_ABI_SYM_NAME_LEN]; - assert(event->registered == 1); - desc = event->desc; - ret = __tracepoint_probe_unregister(desc->name, + assert(event->priv->registered == 1); + desc = event->priv->desc; + lttng_ust_format_event_name(desc, name); + ret = lttng_ust_tp_probe_unregister_queue_release(name, desc->probe_callback, event); WARN_ON_ONCE(ret); if (!ret) - event->registered = 0; + event->priv->registered = 0; } -/* - * Only used internally at session destruction. - */ static -void _lttng_event_unregister(struct lttng_event *event) +void _lttng_event_unregister(struct lttng_ust_event_common *event) { - if (event->registered) + if (event->priv->registered) unregister_event(event); } -void lttng_session_destroy(struct lttng_session *session) +void lttng_session_destroy(struct lttng_ust_session *session) { - struct lttng_channel *chan, *tmpchan; - struct lttng_event *event, *tmpevent; + struct lttng_ust_channel_buffer_private *chan, *tmpchan; + struct lttng_ust_event_recorder_private *event_recorder_priv, *tmpevent_recorder_priv; 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); + cds_list_for_each_entry(event_recorder_priv, &session->priv->events_head, node) { + _lttng_event_unregister(event_recorder_priv->parent.pub); } - synchronize_trace(); /* Wait for in-flight events to complete */ - cds_list_for_each_entry_safe(enabler, tmpenabler, - &session->enablers_head, node) - lttng_enabler_destroy(enabler); - cds_list_for_each_entry_safe(event, tmpevent, - &session->events_head, node) - _lttng_event_destroy(event); + lttng_ust_urcu_synchronize_rcu(); /* Wait for in-flight events to complete */ + lttng_ust_tp_probe_prune_release_queue(); + cds_list_for_each_entry_safe(event_enabler, event_tmpenabler, + &session->priv->enablers_head, node) + lttng_event_enabler_destroy(event_enabler); + cds_list_for_each_entry_safe(event_recorder_priv, tmpevent_recorder_priv, + &session->priv->events_head, node) + _lttng_event_destroy(event_recorder_priv->parent.pub); cds_list_for_each_entry_safe(_enum, tmp_enum, - &session->enums_head, node) + &session->priv->enums_head, node) _lttng_enum_destroy(_enum); - cds_list_for_each_entry_safe(chan, tmpchan, &session->chan_head, node) - _lttng_channel_unmap(chan); - cds_list_del(&session->node); + cds_list_for_each_entry_safe(chan, tmpchan, &session->priv->chan_head, node) + _lttng_channel_unmap(chan->pub); + cds_list_del(&session->priv->node); + lttng_destroy_context(session->priv->ctx); + free(session->priv); free(session); } -int lttng_session_enable(struct lttng_session *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_ust_event_notifier_private *event_notifier_priv, *tmpevent_notifier_priv; + + if (!event_notifier_group) { + return; + } + + cds_list_for_each_entry(event_notifier_priv, + &event_notifier_group->event_notifiers_head, node) + _lttng_event_unregister(event_notifier_priv->parent.pub); + + lttng_ust_urcu_synchronize_rcu(); + + 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(event_notifier_priv, tmpevent_notifier_priv, + &event_notifier_group->event_notifiers_head, node) + _lttng_event_destroy(event_notifier_priv->parent.pub); + + 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_ust_enum_desc *desc, + struct lttng_ust_session *session) +{ + const char *enum_name = desc->name; + struct lttng_enum *_enum; + struct cds_hlist_head *head; + 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->priv->enums_ht.table[hash & (LTTNG_UST_ENUM_HT_SIZE - 1)]; + + _enum = lttng_ust_enum_get_from_desc(session, desc); + if (_enum) { + ret = -EEXIST; + goto exist; + } + + notify_socket = lttng_get_notify_socket(session->priv->owner); + if (notify_socket < 0) { + ret = notify_socket; + goto socket_error; + } + + _enum = zmalloc(sizeof(*_enum)); + if (!_enum) { + ret = -ENOMEM; + goto cache_error; + } + _enum->session = session; + _enum->desc = desc; + + ret = ustcomm_register_enum(notify_socket, + session->priv->objd, + enum_name, + desc->nr_entries, + desc->entries, + &_enum->id); + if (ret < 0) { + DBG("Error (%d) registering enumeration to sessiond", ret); + goto sessiond_register_error; + } + cds_list_add(&_enum->node, &session->priv->enums_head); + cds_hlist_add_head(&_enum->hlist, head); + return 0; + +sessiond_register_error: + free(_enum); +cache_error: +socket_error: +exist: + return ret; +} + +static +int lttng_create_enum_check(const struct lttng_ust_type_common *type, + struct lttng_ust_session *session) +{ + switch (type->type) { + case lttng_ust_type_enum: + { + const struct lttng_ust_enum_desc *enum_desc; + int ret; + + enum_desc = lttng_ust_get_type_enum(type)->desc; + ret = lttng_enum_create(enum_desc, session); + if (ret && ret != -EEXIST) { + DBG("Unable to create enum error: (%d)", ret); + return ret; + } + break; + } + case lttng_ust_type_dynamic: + { + const struct lttng_ust_event_field *tag_field_generic; + const struct lttng_ust_enum_desc *enum_desc; + int ret; + + tag_field_generic = lttng_ust_dynamic_type_tag_field(); + enum_desc = lttng_ust_get_type_enum(tag_field_generic->type)->desc; + ret = lttng_enum_create(enum_desc, session); + if (ret && ret != -EEXIST) { + DBG("Unable to create enum error: (%d)", ret); + return ret; + } + break; + } + default: + /* TODO: nested types when they become supported. */ + break; + } + return 0; +} + +static +int lttng_create_all_event_enums(size_t nr_fields, + const struct lttng_ust_event_field **event_fields, + struct lttng_ust_session *session) +{ + size_t i; + int ret; + + /* For each field, ensure enum is part of the session. */ + for (i = 0; i < nr_fields; i++) { + const struct lttng_ust_type_common *type = event_fields[i]->type; + + ret = lttng_create_enum_check(type, session); + if (ret) + return ret; + } + return 0; +} + +static +int lttng_create_all_ctx_enums(size_t nr_fields, + struct lttng_ust_ctx_field *ctx_fields, + struct lttng_ust_session *session) +{ + size_t i; + int ret; + + /* For each field, ensure enum is part of the session. */ + for (i = 0; i < nr_fields; i++) { + const struct lttng_ust_type_common *type = ctx_fields[i].event_field->type; + + ret = lttng_create_enum_check(type, session); + if (ret) + return ret; + } + return 0; +} + +/* + * Ensure that a state-dump will be performed for this session at the end + * of the current handle_message(). + */ +int lttng_session_statedump(struct lttng_ust_session *session) +{ + session->priv->statedump_pending = 1; + lttng_ust_sockinfo_session_enabled(session->priv->owner); + return 0; +} + +int lttng_session_enable(struct lttng_ust_session *session) { int ret = 0; - struct lttng_channel *chan; + struct lttng_ust_channel_buffer_private *chan; int notify_socket; if (session->active) { @@ -250,20 +577,23 @@ int lttng_session_enable(struct lttng_session *session) goto end; } - notify_socket = lttng_get_notify_socket(session->owner); + notify_socket = lttng_get_notify_socket(session->priv->owner); if (notify_socket < 0) return notify_socket; /* Set transient enabler state to "enabled" */ - session->tstate = 1; + session->priv->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. */ - cds_list_for_each_entry(chan, &session->chan_head, node) { - const struct lttng_ctx *ctx; - const struct lttng_ctx_field *fields = NULL; + cds_list_for_each_entry(chan, &session->priv->chan_head, node) { + struct lttng_ust_ctx *ctx; + struct lttng_ust_ctx_field *fields = NULL; size_t nr_fields = 0; uint32_t chan_id; @@ -274,10 +604,17 @@ int lttng_session_enable(struct lttng_session *session) if (ctx) { nr_fields = ctx->nr_fields; fields = ctx->fields; + ret = lttng_create_all_ctx_enums(nr_fields, fields, + session); + if (ret < 0) { + DBG("Error (%d) adding enum to session", ret); + return ret; + } } ret = ustcomm_register_channel(notify_socket, - session->objd, - chan->objd, + session, + session->priv->objd, + chan->parent.objd, nr_fields, fields, &chan_id, @@ -293,20 +630,18 @@ int lttng_session_enable(struct lttng_session *session) } } - /* 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; + CMM_ACCESS_ONCE(session->priv->been_active) = 1; - session->statedump_pending = 1; - lttng_ust_sockinfo_session_enabled(session->owner); + ret = lttng_session_statedump(session); + if (ret) + return ret; end: return ret; } -int lttng_session_disable(struct lttng_session *session) +int lttng_session_disable(struct lttng_ust_session *session) { int ret = 0; @@ -318,252 +653,263 @@ int lttng_session_disable(struct lttng_session *session) CMM_ACCESS_ONCE(session->active) = 0; /* Set transient enabler state to "disabled" */ - session->tstate = 0; - lttng_session_sync_enablers(session); + session->priv->tstate = 0; + lttng_session_sync_event_enablers(session); end: return ret; } -int lttng_channel_enable(struct lttng_channel *channel) +int lttng_channel_enable(struct lttng_ust_channel_common *lttng_channel) { int ret = 0; - if (channel->enabled) { + if (lttng_channel->enabled) { ret = -EBUSY; goto end; } /* Set transient enabler state to "enabled" */ - channel->tstate = 1; - lttng_session_sync_enablers(channel->session); + lttng_channel->priv->tstate = 1; + lttng_session_sync_event_enablers(lttng_channel->session); /* Set atomically the state to "enabled" */ - CMM_ACCESS_ONCE(channel->enabled) = 1; + CMM_ACCESS_ONCE(lttng_channel->enabled) = 1; end: return ret; } -int lttng_channel_disable(struct lttng_channel *channel) +int lttng_channel_disable(struct lttng_ust_channel_common *lttng_channel) { int ret = 0; - if (!channel->enabled) { + if (!lttng_channel->enabled) { ret = -EBUSY; goto end; } /* Set atomically the state to "disabled" */ - CMM_ACCESS_ONCE(channel->enabled) = 0; + CMM_ACCESS_ONCE(lttng_channel->enabled) = 0; /* Set transient enabler state to "enabled" */ - channel->tstate = 0; - lttng_session_sync_enablers(channel->session); + lttng_channel->priv->tstate = 0; + lttng_session_sync_event_enablers(lttng_channel->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 struct lttng_ust_event_desc *desc) +{ + char name[LTTNG_UST_ABI_SYM_NAME_LEN]; + size_t name_len; + uint32_t hash; + + lttng_ust_format_event_name(desc, name); + name_len = strlen(name); + + hash = jhash(name, name_len, 0); + return &hash_table[hash & (hash_table_size - 1)]; +} + +/* + * Supports event creation while tracing session is active. + */ static -int lttng_enum_create(const struct lttng_enum_desc *desc, - struct lttng_session *session) +int lttng_event_recorder_create(const struct lttng_ust_event_desc *desc, + struct lttng_ust_channel_buffer *chan) { - const char *enum_name = desc->name; - struct lttng_enum *_enum; + char name[LTTNG_UST_ABI_SYM_NAME_LEN]; + struct lttng_ust_event_recorder *event_recorder; + struct lttng_ust_event_recorder_private *event_recorder_priv; + struct lttng_ust_session *session = chan->parent->session; 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; + int notify_socket, loglevel; + const char *uri; - 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; - } - } + head = borrow_hash_table_bucket(chan->parent->session->priv->events_ht.table, + LTTNG_UST_EVENT_HT_SIZE, desc); - notify_socket = lttng_get_notify_socket(session->owner); + notify_socket = lttng_get_notify_socket(session->priv->owner); if (notify_socket < 0) { ret = notify_socket; goto socket_error; } - _enum = zmalloc(sizeof(*_enum)); - if (!_enum) { + ret = lttng_create_all_event_enums(desc->nr_fields, desc->fields, + session); + if (ret < 0) { + DBG("Error (%d) adding enum to session", ret); + goto create_enum_error; + } + + /* + * Check if loglevel match. Refuse to connect event if not. + */ + event_recorder = zmalloc(sizeof(struct lttng_ust_event_recorder)); + if (!event_recorder) { ret = -ENOMEM; goto cache_error; } - _enum->session = session; - _enum->desc = desc; + event_recorder->struct_size = sizeof(struct lttng_ust_event_recorder); - ret = ustcomm_register_enum(notify_socket, - session->objd, - enum_name, - desc->nr_entries, - desc->entries, - &_enum->id); - if (ret < 0) { - DBG("Error (%d) registering enumeration to sessiond", ret); - goto sessiond_register_error; + event_recorder->parent = zmalloc(sizeof(struct lttng_ust_event_common)); + if (!event_recorder->parent) { + ret = -ENOMEM; + goto parent_error; } - cds_list_add(&_enum->node, &session->enums_head); - cds_hlist_add_head(&_enum->hlist, head); - return 0; + event_recorder->parent->struct_size = sizeof(struct lttng_ust_event_common); + event_recorder->parent->type = LTTNG_UST_EVENT_TYPE_RECORDER; + event_recorder->parent->child = event_recorder; -sessiond_register_error: - free(_enum); -cache_error: -socket_error: -exist: - return ret; -} + event_recorder_priv = zmalloc(sizeof(struct lttng_ust_event_recorder_private)); + if (!event_recorder_priv) { + ret = -ENOMEM; + goto priv_error; + } + event_recorder->priv = event_recorder_priv; + event_recorder_priv->pub = event_recorder; + event_recorder->parent->priv = &event_recorder_priv->parent; + event_recorder_priv->parent.pub = event_recorder->parent; -static -int lttng_event_create_all_enums(const struct lttng_event_desc *desc, - struct lttng_session *session) -{ - unsigned int nr_fields, i; - const struct lttng_event_field *fields; - - /* For each field, ensure enum is part of the session. */ - nr_fields = desc->nr_fields; - fields = desc->fields; - for (i = 0; i < nr_fields; i++) { - const struct lttng_type *type = &fields[i].type; - - switch (type->atype) { - case atype_enum: - { - const struct lttng_enum_desc *enum_desc; - int ret; - - enum_desc = type->u.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; - } - default: - /* TODO: nested types when they become supported. */ - continue; - } - } - return 0; -} - -/* - * Supports event creation while tracing session is active. - */ -static -int lttng_event_create(const struct lttng_event_desc *desc, - struct lttng_channel *chan) -{ - const char *event_name = desc->name; - struct lttng_event *event; - struct lttng_session *session = chan->session; - struct cds_hlist_head *head; - struct cds_hlist_node *node; - 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) { - ret = -EEXIST; - goto exist; - } - } - - notify_socket = lttng_get_notify_socket(session->owner); - if (notify_socket < 0) { - ret = notify_socket; - goto socket_error; - } - - ret = lttng_event_create_all_enums(desc, session); - if (ret < 0) { - DBG("Error (%d) adding enum to session", ret); - goto create_enum_error; - } - - /* - * Check if loglevel match. Refuse to connect event if not. - */ - event = zmalloc(sizeof(struct lttng_event)); - if (!event) { - ret = -ENOMEM; - goto cache_error; - } - event->chan = chan; + event_recorder->chan = chan; /* 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->enablers_ref_head); - event->desc = desc; + event_recorder->parent->run_filter = lttng_ust_interpret_event_filter; + event_recorder->parent->enabled = 0; + event_recorder->parent->priv->registered = 0; + CDS_INIT_LIST_HEAD(&event_recorder->parent->priv->filter_bytecode_runtime_head); + CDS_INIT_LIST_HEAD(&event_recorder->parent->priv->enablers_ref_head); + event_recorder->parent->priv->desc = desc; if (desc->loglevel) - loglevel = *(*event->desc->loglevel); + loglevel = *(*event_recorder->parent->priv->desc->loglevel); else loglevel = TRACE_DEFAULT; - if (desc->u.ext.model_emf_uri) - uri = *(desc->u.ext.model_emf_uri); + if (desc->model_emf_uri) + uri = *(desc->model_emf_uri); else uri = NULL; + lttng_ust_format_event_name(desc, name); + /* Fetch event ID from sessiond */ ret = ustcomm_register_event(notify_socket, session, - session->objd, - chan->objd, - event_name, + session->priv->objd, + chan->priv->parent.objd, + name, loglevel, desc->signature, desc->nr_fields, desc->fields, uri, - &event->id); + &event_recorder->priv->id); 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_recorder_priv->node, &chan->parent->session->priv->events_head); + cds_hlist_add_head(&event_recorder_priv->hlist, head); return 0; sessiond_register_error: - free(event); + free(event_recorder_priv); +priv_error: + free(event_recorder->parent); +parent_error: + free(event_recorder); cache_error: create_enum_error: socket_error: -exist: return ret; } static -int lttng_desc_match_wildcard_enabler(const struct lttng_event_desc *desc, +int lttng_event_notifier_create(const struct lttng_ust_event_desc *desc, + uint64_t token, uint64_t error_counter_index, + struct lttng_event_notifier_group *event_notifier_group) +{ + struct lttng_ust_event_notifier *event_notifier; + struct lttng_ust_event_notifier_private *event_notifier_priv; + 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); + + event_notifier = zmalloc(sizeof(struct lttng_ust_event_notifier)); + if (!event_notifier) { + ret = -ENOMEM; + goto error; + } + event_notifier->struct_size = sizeof(struct lttng_ust_event_notifier); + + event_notifier->parent = zmalloc(sizeof(struct lttng_ust_event_common)); + if (!event_notifier->parent) { + ret = -ENOMEM; + goto parent_error; + } + event_notifier->parent->struct_size = sizeof(struct lttng_ust_event_common); + event_notifier->parent->type = LTTNG_UST_EVENT_TYPE_NOTIFIER; + event_notifier->parent->child = event_notifier; + + event_notifier_priv = zmalloc(sizeof(struct lttng_ust_event_notifier_private)); + if (!event_notifier_priv) { + ret = -ENOMEM; + goto priv_error; + } + event_notifier->priv = event_notifier_priv; + event_notifier_priv->pub = event_notifier; + event_notifier->parent->priv = &event_notifier_priv->parent; + event_notifier_priv->parent.pub = event_notifier->parent; + + event_notifier_priv->group = event_notifier_group; + event_notifier_priv->parent.user_token = token; + event_notifier_priv->error_counter_index = error_counter_index; + + /* Event notifier will be enabled by enabler sync. */ + event_notifier->parent->run_filter = lttng_ust_interpret_event_filter; + event_notifier->parent->enabled = 0; + event_notifier_priv->parent.registered = 0; + + CDS_INIT_LIST_HEAD(&event_notifier->parent->priv->filter_bytecode_runtime_head); + CDS_INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head); + CDS_INIT_LIST_HEAD(&event_notifier_priv->parent.enablers_ref_head); + event_notifier_priv->parent.desc = desc; + event_notifier->notification_send = lttng_event_notifier_notification_send; + + cds_list_add(&event_notifier_priv->node, + &event_notifier_group->event_notifiers_head); + cds_hlist_add_head(&event_notifier_priv->hlist, head); + + return 0; + +priv_error: + free(event_notifier->parent); +parent_error: + free(event_notifier); +error: + return ret; +} + +static +int lttng_desc_match_star_glob_enabler(const struct lttng_ust_event_desc *desc, struct lttng_enabler *enabler) { + char name[LTTNG_UST_ABI_SYM_NAME_LEN]; int loglevel = 0; unsigned int has_loglevel = 0; - assert(enabler->type == LTTNG_ENABLER_WILDCARD); - /* Compare excluding final '*' */ - if (strncmp(desc->name, enabler->event_param.name, - strlen(enabler->event_param.name) - 1)) + lttng_ust_format_event_name(desc, name); + assert(enabler->format_type == LTTNG_ENABLER_FORMAT_STAR_GLOB); + if (!strutils_star_glob_match(enabler->event_param.name, SIZE_MAX, + name, SIZE_MAX)) return 0; if (desc->loglevel) { loglevel = *(*desc->loglevel); @@ -578,14 +924,16 @@ int lttng_desc_match_wildcard_enabler(const struct lttng_event_desc *desc, } static -int lttng_desc_match_event_enabler(const struct lttng_event_desc *desc, +int lttng_desc_match_event_enabler(const struct lttng_ust_event_desc *desc, struct lttng_enabler *enabler) { + char name[LTTNG_UST_ABI_SYM_NAME_LEN]; int loglevel = 0; unsigned int has_loglevel = 0; - assert(enabler->type == LTTNG_ENABLER_EVENT); - if (strcmp(desc->name, enabler->event_param.name)) + lttng_ust_format_event_name(desc, name); + assert(enabler->format_type == LTTNG_ENABLER_FORMAT_EVENT); + if (strcmp(name, enabler->event_param.name)) return 0; if (desc->loglevel) { loglevel = *(*desc->loglevel); @@ -600,38 +948,45 @@ int lttng_desc_match_event_enabler(const struct lttng_event_desc *desc, } static -int lttng_desc_match_enabler(const struct lttng_event_desc *desc, +int lttng_desc_match_enabler(const struct lttng_ust_event_desc *desc, struct lttng_enabler *enabler) { - struct lttng_ust_excluder_node *excluder; - - /* If event matches with an excluder, return 'does not match' */ - cds_list_for_each_entry(excluder, &enabler->excluder_head, node) { - int count; - - for (count = 0; count < excluder->excluder.count; count++) { - int found, len; - char *excluder_name; - - excluder_name = (char *) (excluder->excluder.names) - + count * LTTNG_UST_SYM_NAME_LEN; - len = strnlen(excluder_name, LTTNG_UST_SYM_NAME_LEN); - if (len > 0 && excluder_name[len - 1] == '*') { - found = !strncmp(desc->name, excluder_name, - len - 1); - } else { - found = !strncmp(desc->name, excluder_name, - LTTNG_UST_SYM_NAME_LEN - 1); - } - if (found) { - return 0; + switch (enabler->format_type) { + case LTTNG_ENABLER_FORMAT_STAR_GLOB: + { + struct lttng_ust_excluder_node *excluder; + + if (!lttng_desc_match_star_glob_enabler(desc, enabler)) { + return 0; + } + + /* + * If the matching event matches with an excluder, + * return 'does not match' + */ + cds_list_for_each_entry(excluder, &enabler->excluder_head, node) { + int count; + + for (count = 0; count < excluder->excluder.count; count++) { + int len; + char *excluder_name; + + excluder_name = (char *) (excluder->excluder.names) + + count * LTTNG_UST_ABI_SYM_NAME_LEN; + len = strnlen(excluder_name, LTTNG_UST_ABI_SYM_NAME_LEN); + if (len > 0) { + char name[LTTNG_UST_ABI_SYM_NAME_LEN]; + + lttng_ust_format_event_name(desc, name); + if (strutils_star_glob_match(excluder_name, len, name, SIZE_MAX)) { + return 0; + } + } } } + return 1; } - switch (enabler->type) { - case LTTNG_ENABLER_WILDCARD: - return lttng_desc_match_wildcard_enabler(desc, enabler); - case LTTNG_ENABLER_EVENT: + case LTTNG_ENABLER_FORMAT_EVENT: return lttng_desc_match_event_enabler(desc, enabler); default: return -EINVAL; @@ -639,24 +994,40 @@ int lttng_desc_match_enabler(const struct lttng_event_desc *desc, } static -int lttng_event_match_enabler(struct lttng_event *event, - struct lttng_enabler *enabler) +int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, + struct lttng_ust_event_recorder *event_recorder) +{ + if (lttng_desc_match_enabler(event_recorder->parent->priv->desc, + lttng_event_enabler_as_enabler(event_enabler)) + && event_recorder->chan == event_enabler->chan) + return 1; + else + return 0; +} + +static +int lttng_event_notifier_enabler_match_event_notifier( + struct lttng_event_notifier_enabler *event_notifier_enabler, + struct lttng_ust_event_notifier *event_notifier) { - if (lttng_desc_match_enabler(event->desc, enabler) - && event->chan == enabler->chan) + int desc_matches = lttng_desc_match_enabler(event_notifier->priv->parent.desc, + lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); + + if (desc_matches && event_notifier->priv->group == event_notifier_enabler->group && + event_notifier->priv->parent.user_token == event_notifier_enabler->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; } @@ -668,12 +1039,12 @@ struct lttng_enabler_ref * lttng_event_enabler_ref(struct lttng_event *event, * tracepoint probes. */ static -void lttng_create_event_if_missing(struct lttng_enabler *enabler) +void lttng_create_event_recorder_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; + struct lttng_ust_session *session = event_enabler->chan->parent->session; + struct lttng_ust_registered_probe *reg_probe; + const struct lttng_ust_event_desc *desc; + struct lttng_ust_event_recorder_private *event_recorder_priv; int i; struct cds_list_head *probe_list; @@ -683,30 +1054,30 @@ void lttng_create_event_if_missing(struct lttng_enabler *enabler) * our enabler, create an associated lttng_event if not * already present. */ - cds_list_for_each_entry(probe_desc, probe_list, head) { + cds_list_for_each_entry(reg_probe, probe_list, head) { + const struct lttng_ust_probe_desc *probe_desc = reg_probe->desc; + for (i = 0; i < probe_desc->nr_events; i++) { - int found = 0, ret; + int ret; + bool found = false; struct cds_hlist_head *head; struct cds_hlist_node *node; - const char *event_name; - size_t name_len; - uint32_t hash; 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))) 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; + head = borrow_hash_table_bucket( + session->priv->events_ht.table, + LTTNG_UST_EVENT_HT_SIZE, desc); + + cds_hlist_for_each_entry(event_recorder_priv, node, head, hlist) { + if (event_recorder_priv->parent.desc == desc + && event_recorder_priv->pub->chan == event_enabler->chan) { + found = true; + break; + } } if (found) continue; @@ -715,37 +1086,180 @@ void lttng_create_event_if_missing(struct lttng_enabler *enabler) * We need to create an event for this * event probe. */ - ret = lttng_event_create(probe_desc->event_desc[i], - enabler->chan); + ret = lttng_event_recorder_create(probe_desc->event_desc[i], + event_enabler->chan); if (ret) { - DBG("Unable to create event %s, error %d\n", - probe_desc->event_desc[i]->name, ret); + DBG("Unable to create event \"%s:%s\", error %d\n", + probe_desc->provider_name, + probe_desc->event_desc[i]->event_name, ret); } } } } +static +void probe_provider_event_for_each(const struct lttng_ust_probe_desc *provider_desc, + void (*event_func)(struct lttng_ust_event_common *event)) +{ + struct cds_hlist_node *node, *tmp_node; + struct cds_list_head *sessionsp; + unsigned int i; + + /* Get handle on list of sessions. */ + sessionsp = lttng_get_sessions(); + + /* + * 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_ust_event_desc *event_desc; + struct lttng_event_notifier_group *event_notifier_group; + struct lttng_ust_event_recorder_private *event_recorder_priv; + struct lttng_ust_event_notifier_private *event_notifier_priv; + struct lttng_ust_session_private *session_priv; + struct cds_hlist_head *head; + + event_desc = provider_desc->event_desc[i]; + + /* + * Iterate over all session to find the current event + * description. + */ + cds_list_for_each_entry(session_priv, 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_priv->events_ht.table, + LTTNG_UST_EVENT_HT_SIZE, event_desc); + + cds_hlist_for_each_entry_safe(event_recorder_priv, node, tmp_node, head, hlist) { + if (event_desc == event_recorder_priv->parent.desc) { + event_func(event_recorder_priv->parent.pub); + 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); + + cds_hlist_for_each_entry_safe(event_notifier_priv, node, tmp_node, head, hlist) { + if (event_desc == event_notifier_priv->parent.desc) { + event_func(event_notifier_priv->parent.pub); + break; + } + } + } + } +} + +static +void _event_enum_destroy(struct lttng_ust_event_common *event) +{ + + switch (event->type) { + case LTTNG_UST_EVENT_TYPE_RECORDER: + { + struct lttng_ust_event_recorder *event_recorder = event->child; + struct lttng_ust_session *session = event_recorder->chan->parent->session; + unsigned int i; + + /* Destroy enums of the current event. */ + for (i = 0; i < event_recorder->parent->priv->desc->nr_fields; i++) { + const struct lttng_ust_enum_desc *enum_desc; + const struct lttng_ust_event_field *field; + struct lttng_enum *curr_enum; + + field = event_recorder->parent->priv->desc->fields[i]; + switch (field->type->type) { + case lttng_ust_type_enum: + enum_desc = lttng_ust_get_type_enum(field->type)->desc; + break; + default: + continue; + } + + curr_enum = lttng_ust_enum_get_from_desc(session, enum_desc); + if (curr_enum) { + _lttng_enum_destroy(curr_enum); + } + } + break; + } + case LTTNG_UST_EVENT_TYPE_NOTIFIER: + break; + default: + abort(); + } + /* Destroy event. */ + _lttng_event_destroy(event); +} + /* - * Create events associated with an enabler (if not already present), + * 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( + const struct lttng_ust_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, _lttng_event_unregister); + + /* Wait for grace period. */ + lttng_ust_urcu_synchronize_rcu(); + /* Prune the unregistration queue. */ + lttng_ust_tp_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); +} + +/* + * Create events associated with an event 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) +int lttng_event_enabler_ref_event_recorders(struct lttng_event_enabler *event_enabler) { - struct lttng_session *session = enabler->chan->session; - struct lttng_event *event; + struct lttng_ust_session *session = event_enabler->chan->parent->session; + struct lttng_ust_event_recorder_private *event_recorder_priv; + + 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(enabler); + lttng_create_event_recorder_if_missing(event_enabler); /* For each event matching enabler in session event list. */ - cds_list_for_each_entry(event, &session->events_head, node) { + cds_list_for_each_entry(event_recorder_priv, &session->priv->events_head, node) { struct lttng_enabler_ref *enabler_ref; - if (!lttng_event_match_enabler(event, enabler)) + if (!lttng_event_enabler_match_event(event_enabler, event_recorder_priv->pub)) continue; - enabler_ref = lttng_event_enabler_ref(event, enabler); + enabler_ref = lttng_enabler_ref(&event_recorder_priv->parent.enablers_ref_head, + lttng_event_enabler_as_enabler(event_enabler)); if (!enabler_ref) { /* * If no backward ref, create it. @@ -754,18 +1268,23 @@ int lttng_enabler_ref_events(struct lttng_enabler *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); + &event_recorder_priv->parent.enablers_ref_head); } /* * Link filter bytecodes if not linked yet. */ - lttng_enabler_event_link_bytecode(event, enabler); + lttng_enabler_link_bytecode(event_recorder_priv->parent.desc, + &session->priv->ctx, + &event_recorder_priv->parent.filter_bytecode_runtime_head, + <tng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head); /* TODO: merge event context. */ } +end: return 0; } @@ -776,10 +1295,20 @@ int lttng_enabler_ref_events(struct lttng_enabler *enabler) */ int lttng_fix_pending_events(void) { - struct lttng_session *session; + struct lttng_ust_session_private *session_priv; - cds_list_for_each_entry(session, &sessions, node) { - lttng_session_lazy_sync_enablers(session); + cds_list_for_each_entry(session_priv, &sessions, node) { + lttng_session_lazy_sync_event_enablers(session_priv->pub); + } + 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; } @@ -791,7 +1320,7 @@ int lttng_fix_pending_events(void) */ void lttng_handle_pending_statedump(void *owner) { - struct lttng_session *session; + struct lttng_ust_session_private *session_priv; /* Execute state dump */ do_lttng_ust_statedump(owner); @@ -800,125 +1329,279 @@ void lttng_handle_pending_statedump(void *owner) if (ust_lock()) { goto end; } - cds_list_for_each_entry(session, &sessions, node) { - if (session->owner != owner) + cds_list_for_each_entry(session_priv, &sessions, node) { + if (session_priv->owner != owner) continue; - if (!session->statedump_pending) + if (!session_priv->statedump_pending) continue; - session->statedump_pending = 0; + session_priv->statedump_pending = 0; } end: ust_unlock(); return; } -/* - * Only used internally at session destruction. - */ static -void _lttng_event_destroy(struct lttng_event *event) +void _lttng_event_destroy(struct lttng_ust_event_common *event) { struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; - cds_list_del(&event->node); - lttng_destroy_context(event->ctx); lttng_free_event_filter_runtime(event); /* Free event enabler refs */ cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, - &event->enablers_ref_head, node) + &event->priv->enablers_ref_head, node) free(enabler_ref); - free(event); + + switch (event->type) { + case LTTNG_UST_EVENT_TYPE_RECORDER: + { + struct lttng_ust_event_recorder *event_recorder = event->child; + + /* Remove from event list. */ + cds_list_del(&event_recorder->priv->node); + /* Remove from event hash table. */ + cds_hlist_del(&event_recorder->priv->hlist); + + lttng_destroy_context(event_recorder->priv->ctx); + free(event_recorder->parent); + free(event_recorder->priv); + free(event_recorder); + break; + } + case LTTNG_UST_EVENT_TYPE_NOTIFIER: + { + struct lttng_ust_event_notifier *event_notifier = event->child; + + /* Remove from event list. */ + cds_list_del(&event_notifier->priv->node); + /* Remove from event hash table. */ + cds_hlist_del(&event_notifier->priv->hlist); + + free(event_notifier->priv); + free(event_notifier->parent); + free(event_notifier); + break; + } + default: + abort(); + } } static void _lttng_enum_destroy(struct lttng_enum *_enum) { cds_list_del(&_enum->node); + cds_hlist_del(&_enum->hlist); free(_enum); } -void lttng_ust_events_exit(void) +void lttng_ust_abi_events_exit(void) { - struct lttng_session *session, *tmpsession; + struct lttng_ust_session_private *session_priv, *tmpsession_priv; - cds_list_for_each_entry_safe(session, tmpsession, &sessions, node) - lttng_session_destroy(session); + cds_list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, node) + lttng_session_destroy(session_priv->pub); } /* * Enabler management. */ -struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, - struct lttng_ust_event *event_param, - struct lttng_channel *chan) +struct lttng_event_enabler *lttng_event_enabler_create( + enum lttng_enabler_format_type format_type, + struct lttng_ust_abi_event *event_param, + struct lttng_ust_channel_buffer *chan) { - 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; + 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->chan = chan; /* 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->chan->parent->session->priv->enablers_head); + lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent->session); + + return event_enabler; } -int lttng_enabler_enable(struct lttng_enabler *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_abi_event_notifier *event_notifier_param) { - enabler->enabled = 1; - lttng_session_lazy_sync_enablers(enabler->chan->session); + 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->user_token = event_notifier_param->event.token; + event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index; + event_notifier_enabler->num_captures = 0; + + 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_event_enabler_enable(struct lttng_event_enabler *event_enabler) +{ + lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; + lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent->session); + return 0; } -int lttng_enabler_disable(struct lttng_enabler *enabler) +int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) { - enabler->enabled = 0; - lttng_session_lazy_sync_enablers(enabler->chan->session); + lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; + lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent->session); + return 0; } -int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, - struct lttng_ust_filter_bytecode_node *bytecode) +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) { - bytecode->enabler = enabler; - cds_list_add_tail(&bytecode->node, &enabler->filter_bytecode_head); - 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->chan->parent->session); return 0; } -int lttng_enabler_attach_exclusion(struct lttng_enabler *enabler, - struct lttng_ust_excluder_node *excluder) +static +void _lttng_enabler_attach_exclusion(struct lttng_enabler *enabler, + struct lttng_ust_excluder_node **excluder) { - excluder->enabler = enabler; - cds_list_add_tail(&excluder->node, &enabler->excluder_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->chan->parent->session); return 0; } -int lttng_attach_context(struct lttng_ust_context *context_param, - struct lttng_ctx **ctx, struct lttng_session *session) +int lttng_event_notifier_enabler_enable( + struct lttng_event_notifier_enabler *event_notifier_enabler) +{ + 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; +} + +int lttng_attach_context(struct lttng_ust_abi_context *context_param, + union lttng_ust_abi_args *uargs, + struct lttng_ust_ctx **ctx, struct lttng_ust_session *session) { /* * We cannot attach a context after trace has been started for a * session because the metadata does not allow expressing this * information outside of the original channel scope. */ - if (session->been_active) + if (session->priv->been_active) return -EPERM; switch (context_param->ctx) { - case LTTNG_UST_CONTEXT_PTHREAD_ID: + case LTTNG_UST_ABI_CONTEXT_PTHREAD_ID: return lttng_add_pthread_id_to_ctx(ctx); - case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: + case LTTNG_UST_ABI_CONTEXT_PERF_THREAD_COUNTER: { - struct lttng_ust_perf_counter_ctx *perf_ctx_param; + struct lttng_ust_abi_perf_counter_ctx *perf_ctx_param; perf_ctx_param = &context_param->u.perf_counter; return lttng_add_perf_counter_to_ctx( @@ -927,87 +1610,98 @@ int lttng_attach_context(struct lttng_ust_context *context_param, perf_ctx_param->name, ctx); } - case LTTNG_UST_CONTEXT_VTID: + case LTTNG_UST_ABI_CONTEXT_VTID: return lttng_add_vtid_to_ctx(ctx); - case LTTNG_UST_CONTEXT_VPID: + case LTTNG_UST_ABI_CONTEXT_VPID: return lttng_add_vpid_to_ctx(ctx); - case LTTNG_UST_CONTEXT_PROCNAME: + case LTTNG_UST_ABI_CONTEXT_PROCNAME: return lttng_add_procname_to_ctx(ctx); - case LTTNG_UST_CONTEXT_IP: + case LTTNG_UST_ABI_CONTEXT_IP: return lttng_add_ip_to_ctx(ctx); - case LTTNG_UST_CONTEXT_CPU_ID: + case LTTNG_UST_ABI_CONTEXT_CPU_ID: return lttng_add_cpu_id_to_ctx(ctx); + case LTTNG_UST_ABI_CONTEXT_APP_CONTEXT: + return lttng_ust_add_app_context_to_ctx_rcu(uargs->app_context.ctxname, + ctx); + case LTTNG_UST_ABI_CONTEXT_CGROUP_NS: + return lttng_add_cgroup_ns_to_ctx(ctx); + case LTTNG_UST_ABI_CONTEXT_IPC_NS: + return lttng_add_ipc_ns_to_ctx(ctx); + case LTTNG_UST_ABI_CONTEXT_MNT_NS: + return lttng_add_mnt_ns_to_ctx(ctx); + case LTTNG_UST_ABI_CONTEXT_NET_NS: + return lttng_add_net_ns_to_ctx(ctx); + case LTTNG_UST_ABI_CONTEXT_PID_NS: + return lttng_add_pid_ns_to_ctx(ctx); + case LTTNG_UST_ABI_CONTEXT_TIME_NS: + return lttng_add_time_ns_to_ctx(ctx); + case LTTNG_UST_ABI_CONTEXT_USER_NS: + return lttng_add_user_ns_to_ctx(ctx); + case LTTNG_UST_ABI_CONTEXT_UTS_NS: + return lttng_add_uts_ns_to_ctx(ctx); + case LTTNG_UST_ABI_CONTEXT_VUID: + return lttng_add_vuid_to_ctx(ctx); + case LTTNG_UST_ABI_CONTEXT_VEUID: + return lttng_add_veuid_to_ctx(ctx); + case LTTNG_UST_ABI_CONTEXT_VSUID: + return lttng_add_vsuid_to_ctx(ctx); + case LTTNG_UST_ABI_CONTEXT_VGID: + return lttng_add_vgid_to_ctx(ctx); + case LTTNG_UST_ABI_CONTEXT_VEGID: + return lttng_add_vegid_to_ctx(ctx); + case LTTNG_UST_ABI_CONTEXT_VSGID: + return lttng_add_vsgid_to_ctx(ctx); default: return -EINVAL; } } -int lttng_enabler_attach_context(struct lttng_enabler *enabler, - struct lttng_ust_context *context_param) +int lttng_event_enabler_attach_context( + struct lttng_event_enabler *enabler __attribute__((unused)), + struct lttng_ust_abi_context *context_param __attribute__((unused))) { -#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_ust_session *session) { - struct lttng_enabler *enabler; - struct lttng_event *event; + struct lttng_event_enabler *event_enabler; + struct lttng_ust_event_recorder_private *event_recorder_priv; - cds_list_for_each_entry(enabler, &session->enablers_head, node) - lttng_enabler_ref_events(enabler); + cds_list_for_each_entry(event_enabler, &session->priv->enablers_head, node) + lttng_event_enabler_ref_event_recorders(event_enabler); /* * For each event, if at least one of its enablers is enabled, * and its channel and session transient states are enabled, we * enable the event, else we disable it. */ - cds_list_for_each_entry(event, &session->events_head, node) { + cds_list_for_each_entry(event_recorder_priv, &session->priv->events_head, node) { struct lttng_enabler_ref *enabler_ref; - struct lttng_bytecode_runtime *runtime; - int enabled = 0, has_enablers_without_bytecode = 0; + struct lttng_ust_bytecode_runtime *runtime; + int enabled = 0, has_enablers_without_filter_bytecode = 0; + int nr_filters = 0; /* Enable events */ cds_list_for_each_entry(enabler_ref, - &event->enablers_ref_head, node) { + &event_recorder_priv->parent.enablers_ref_head, node) { if (enabler_ref->ref->enabled) { enabled = 1; break; @@ -1018,41 +1712,273 @@ void lttng_session_sync_enablers(struct lttng_session *session) * intesection of session and channel transient enable * states. */ - enabled = enabled && session->tstate && event->chan->tstate; + enabled = enabled && session->priv->tstate && event_recorder_priv->pub->chan->priv->parent.tstate; - CMM_STORE_SHARED(event->enabled, enabled); + CMM_STORE_SHARED(event_recorder_priv->pub->parent->enabled, enabled); /* * Sync tracepoint registration with event enabled * state. */ if (enabled) { - if (!event->registered) - register_event(event); + if (!event_recorder_priv->parent.registered) + register_event(event_recorder_priv->parent.pub); } else { - if (event->registered) - unregister_event(event); + if (event_recorder_priv->parent.registered) + unregister_event(event_recorder_priv->parent.pub); } /* Check if has enablers without bytecode enabled */ cds_list_for_each_entry(enabler_ref, - &event->enablers_ref_head, node) { + &event_recorder_priv->parent.enablers_ref_head, node) { if (enabler_ref->ref->enabled && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { - has_enablers_without_bytecode = 1; + has_enablers_without_filter_bytecode = 1; break; } } - event->has_enablers_without_bytecode = - has_enablers_without_bytecode; + event_recorder_priv->parent.has_enablers_without_filter_bytecode = + has_enablers_without_filter_bytecode; /* Enable filters */ cds_list_for_each_entry(runtime, - &event->bytecode_runtime_head, node) { - lttng_filter_sync_state(runtime); + &event_recorder_priv->parent.filter_bytecode_runtime_head, node) { + lttng_bytecode_sync_state(runtime); + nr_filters++; + } + CMM_STORE_SHARED(event_recorder_priv->parent.pub->eval_filter, + !(has_enablers_without_filter_bytecode || !nr_filters)); + } + lttng_ust_tp_probe_prune_release_queue(); +} + +/* Support for event notifier is introduced by probe provider major version 2. */ +static +bool lttng_ust_probe_supports_event_notifier(const struct lttng_ust_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_ust_registered_probe *reg_probe; + struct cds_list_head *probe_list; + int i; + + probe_list = lttng_get_probe_list_head(); + + cds_list_for_each_entry(reg_probe, probe_list, head) { + const struct lttng_ust_probe_desc *probe_desc = reg_probe->desc; + + for (i = 0; i < probe_desc->nr_events; i++) { + int ret; + bool found = false; + const struct lttng_ust_event_desc *desc; + struct lttng_ust_event_notifier_private *event_notifier_priv; + 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))) + 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); + + cds_hlist_for_each_entry(event_notifier_priv, 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_priv->parent.desc == desc && + event_notifier_priv->parent.user_token == event_notifier_enabler->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:%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_name, + probe_desc->provider_name, desc->event_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->user_token, + event_notifier_enabler->error_counter_index, + event_notifier_group); + if (ret) { + DBG("Unable to create event_notifier \"%s:%s\", error %d\n", + probe_desc->provider_name, + probe_desc->event_desc[i]->event_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_ust_event_notifier_private *event_notifier_priv; + + /* + * 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_priv, &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_priv->pub)) + continue; + + enabler_ref = lttng_enabler_ref(&event_notifier_priv->parent.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_priv->parent.enablers_ref_head); + } + + /* + * Link filter bytecodes if not linked yet. + */ + lttng_enabler_link_bytecode(event_notifier_priv->parent.desc, + &event_notifier_group->ctx, + &event_notifier_priv->parent.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_priv->parent.desc, + &event_notifier_group->ctx, &event_notifier_priv->capture_bytecode_runtime_head, + &event_notifier_enabler->capture_bytecode_head); + + event_notifier_priv->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_ust_event_notifier_private *event_notifier_priv; + + 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_priv, &event_notifier_group->event_notifiers_head, node) { + struct lttng_enabler_ref *enabler_ref; + struct lttng_ust_bytecode_runtime *runtime; + int enabled = 0, has_enablers_without_filter_bytecode = 0; + int nr_filters = 0, nr_captures = 0; + + /* Enable event_notifiers */ + cds_list_for_each_entry(enabler_ref, + &event_notifier_priv->parent.enablers_ref_head, node) { + if (enabler_ref->ref->enabled) { + enabled = 1; + break; + } + } + + CMM_STORE_SHARED(event_notifier_priv->pub->parent->enabled, enabled); + /* + * Sync tracepoint registration with event_notifier enabled + * state. + */ + if (enabled) { + if (!event_notifier_priv->parent.registered) + register_event(event_notifier_priv->parent.pub); + } else { + if (event_notifier_priv->parent.registered) + unregister_event(event_notifier_priv->parent.pub); + } + + /* Check if has enablers without bytecode enabled */ + cds_list_for_each_entry(enabler_ref, + &event_notifier_priv->parent.enablers_ref_head, node) { + if (enabler_ref->ref->enabled + && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { + has_enablers_without_filter_bytecode = 1; + break; + } + } + event_notifier_priv->parent.has_enablers_without_filter_bytecode = + has_enablers_without_filter_bytecode; + + /* Enable filters */ + cds_list_for_each_entry(runtime, + &event_notifier_priv->parent.filter_bytecode_runtime_head, node) { + lttng_bytecode_sync_state(runtime); + nr_filters++; + } + CMM_STORE_SHARED(event_notifier_priv->parent.pub->eval_filter, + !(has_enablers_without_filter_bytecode || !nr_filters)); + + /* Enable captures. */ + cds_list_for_each_entry(runtime, + &event_notifier_priv->capture_bytecode_runtime_head, node) { + lttng_bytecode_sync_state(runtime); + nr_captures++; + } + CMM_STORE_SHARED(event_notifier_priv->pub->eval_capture, + !!nr_captures); + } + lttng_ust_tp_probe_prune_release_queue(); +} + /* * Apply enablers to session events, adding events to session if need * be. It is required after each modification applied to an active @@ -1060,10 +1986,95 @@ void lttng_session_sync_enablers(struct lttng_session *session) * "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_ust_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 sessions 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_session_provider(const char *name, + size_t (*get_size)(void *priv, size_t offset), + void (*record)(void *priv, struct lttng_ust_lib_ring_buffer_ctx *ctx, + struct lttng_ust_channel_buffer *chan), + void (*get_value)(void *priv, struct lttng_ust_ctx_value *value), + void *priv) +{ + struct lttng_ust_session_private *session_priv; + + cds_list_for_each_entry(session_priv, &sessions, node) { + struct lttng_ust_channel_buffer_private *chan; + struct lttng_ust_event_recorder_private *event_recorder_priv; + int ret; + + ret = lttng_ust_context_set_provider_rcu(&session_priv->ctx, + name, get_size, record, get_value, priv); + if (ret) + abort(); + cds_list_for_each_entry(chan, &session_priv->chan_head, node) { + ret = lttng_ust_context_set_provider_rcu(&chan->ctx, + name, get_size, record, get_value, priv); + if (ret) + abort(); + } + cds_list_for_each_entry(event_recorder_priv, &session_priv->events_head, node) { + ret = lttng_ust_context_set_provider_rcu(&event_recorder_priv->ctx, + name, get_size, record, get_value, priv); + if (ret) + abort(); + } + } +} + +/* + * 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)(void *priv, size_t offset), + void (*record)(void *priv, struct lttng_ust_lib_ring_buffer_ctx *ctx, + struct lttng_ust_channel_buffer *chan), + void (*get_value)(void *priv, struct lttng_ust_ctx_value *value), + void *priv) +{ + 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, priv); + if (ret) + abort(); + } +} + +int lttng_ust_session_uuid_validate(struct lttng_ust_session *session, + unsigned char *uuid) +{ + if (!session) + return 0; + /* Compare UUID with session. */ + if (session->priv->uuid_set) { + if (memcmp(session->priv->uuid, uuid, LTTNG_UST_UUID_LEN)) { + return -1; + } + } else { + memcpy(session->priv->uuid, uuid, LTTNG_UST_UUID_LEN); + session->priv->uuid_set = true; + } + return 0; + }