+++ /dev/null
-/*
- * Copyright (C) 2020 Francis Deslauriers <francis.deslauriers@efficios.com>
- *
- * SPDX-License-Identifier: GPL-2.0-only
- *
- */
-
-#include <fcntl.h>
-#include <sys/mman.h>
-#include <sys/stat.h>
-#include <unistd.h>
-#include <urcu/compiler.h>
-#include <pthread.h>
-
-#include <common/error.h>
-#include <common/hashtable/hashtable.h>
-#include <common/index-allocator.h>
-#include <common/kernel-ctl/kernel-ctl.h>
-#include <common/shm.h>
-#include <lttng/trigger/trigger-internal.h>
-
-#include "event-notifier-error-accounting.h"
-#include "lttng-ust-error.h"
-#include "ust-app.h"
-
-#define ERROR_COUNTER_INDEX_HT_INITIAL_SIZE 16
-
-struct index_ht_entry {
- struct lttng_ht_node_u64 node;
- uint64_t error_counter_index;
- struct rcu_head rcu_head;
-};
-
-struct ust_error_accounting_entry {
- uid_t uid;
- struct urcu_ref ref;
- struct lttng_ht_node_u64 node;
- struct rcu_head rcu_head;
- struct lttng_ust_ctl_daemon_counter *daemon_counter;
- /*
- * Those `lttng_ust_abi_object_data` are anonymous handles to the
- * counters objects.
- * They are only used to be duplicated for each new applications of the
- * user. To destroy them, call with the `sock` parameter set to -1.
- * e.g. `lttng_ust_ctl_release_object(-1, data)`;
- */
- struct lttng_ust_abi_object_data *counter;
- struct lttng_ust_abi_object_data **cpu_counters;
- int nr_counter_cpu_fds;
-};
-
-struct kernel_error_accounting_entry {
- int error_counter_fd;
-};
-
-static struct kernel_error_accounting_entry kernel_error_accounting_entry;
-
-/* Hashtable mapping uid to error_account_entry. */
-static struct lttng_ht *error_counter_uid_ht;
-
-struct error_accounting_state {
- struct lttng_index_allocator *index_allocator;
- /* Hashtable mapping event notifier token to index_ht_entry. */
- struct lttng_ht *indices_ht;
- uint64_t number_indices;
-};
-
-static struct error_accounting_state ust_state;
-static struct error_accounting_state kernel_state;
-
-static inline void get_trigger_info_for_log(const struct lttng_trigger *trigger,
- const char **trigger_name,
- uid_t *trigger_owner_uid)
-{
- enum lttng_trigger_status trigger_status;
-
- trigger_status = lttng_trigger_get_name(trigger, trigger_name);
- switch (trigger_status) {
- case LTTNG_TRIGGER_STATUS_OK:
- break;
- case LTTNG_TRIGGER_STATUS_UNSET:
- *trigger_name = "(anonymous)";
- break;
- default:
- abort();
- }
-
- trigger_status = lttng_trigger_get_owner_uid(trigger,
- trigger_owner_uid);
- assert(trigger_status == LTTNG_TRIGGER_STATUS_OK);
-}
-
-static inline
-const char *error_accounting_status_str(
- enum event_notifier_error_accounting_status status)
-{
- switch (status) {
- case EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK:
- return "OK";
- case EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR:
- return "ERROR";
- case EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_NOT_FOUND:
- return "NOT_FOUND";
- case EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_NOMEM:
- return "NOMEM";
- case EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_NO_INDEX_AVAILABLE:
- return "NO_INDEX_AVAILABLE";
- case EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_APP_DEAD:
- return "APP_DEAD";
- default:
- abort();
- }
-}
-
-#ifdef HAVE_LIBLTTNG_UST_CTL
-struct event_notifier_counter {
- pthread_mutex_t lock;
- long count;
-};
-
-static struct event_notifier_counter the_event_notifier_counter;
-
-static void free_ust_error_accounting_entry(struct rcu_head *head)
-{
- int i;
- struct ust_error_accounting_entry *entry =
- caa_container_of(head, typeof(*entry), rcu_head);
-
- for (i = 0; i < entry->nr_counter_cpu_fds; i++) {
- lttng_ust_ctl_release_object(-1, entry->cpu_counters[i]);
- free(entry->cpu_counters[i]);
- }
-
- free(entry->cpu_counters);
-
- lttng_ust_ctl_release_object(-1, entry->counter);
- free(entry->counter);
-
- lttng_ust_ctl_destroy_counter(entry->daemon_counter);
-
- free(entry);
-}
-
-static
-bool ust_error_accounting_entry_get(struct ust_error_accounting_entry *entry)
-{
- return urcu_ref_get_unless_zero(&entry->ref);
-}
-
-static
-void ust_error_accounting_entry_release(struct urcu_ref *entry_ref)
-{
- struct ust_error_accounting_entry *entry =
- container_of(entry_ref, typeof(*entry), ref);
-
- rcu_read_lock();
- cds_lfht_del(error_counter_uid_ht->ht, &entry->node.node);
- call_rcu(&entry->rcu_head, free_ust_error_accounting_entry);
- rcu_read_unlock();
-}
-
-
-static
-void ust_error_accounting_entry_put(struct ust_error_accounting_entry *entry)
-{
- if (!entry) {
- return;
- }
-
- urcu_ref_put(&entry->ref, ust_error_accounting_entry_release);
-}
-
-/*
- * Put one reference to every UID entries.
- */
-static
-void put_ref_all_ust_error_accounting_entry(void)
-{
- struct lttng_ht_iter iter;
- struct ust_error_accounting_entry *uid_entry;
-
- ASSERT_LOCKED(the_event_notifier_counter.lock);
-
- rcu_read_lock();
- cds_lfht_for_each_entry(error_counter_uid_ht->ht, &iter.iter,
- uid_entry, node.node) {
- ust_error_accounting_entry_put(uid_entry);
- }
-
- rcu_read_unlock();
-}
-
-/*
- * Get one reference to every UID entries.
- */
-static
-void get_ref_all_ust_error_accounting_entry(void)
-{
- struct lttng_ht_iter iter;
- struct ust_error_accounting_entry *uid_entry;
-
- ASSERT_LOCKED(the_event_notifier_counter.lock);
-
- rcu_read_lock();
- cds_lfht_for_each_entry(error_counter_uid_ht->ht, &iter.iter,
- uid_entry, node.node) {
- ust_error_accounting_entry_get(uid_entry);
- }
-
- rcu_read_unlock();
-}
-
-#endif /* HAVE_LIBLTTNG_UST_CTL */
-
-static
-enum event_notifier_error_accounting_status
-init_error_accounting_state(struct error_accounting_state *state,
- uint64_t index_count)
-{
- enum event_notifier_error_accounting_status status;
-
- assert(state);
-
- state->number_indices = index_count;
-
- state->index_allocator = lttng_index_allocator_create(index_count);
- if (!state->index_allocator) {
- ERR("Failed to allocate event notifier error counter index allocator");
- status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_NOMEM;
- goto end;
- }
-
- state->indices_ht = lttng_ht_new(ERROR_COUNTER_INDEX_HT_INITIAL_SIZE,
- LTTNG_HT_TYPE_U64);
- if (!state->indices_ht) {
- ERR("Failed to allocate error counter indices hash table");
- status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_NOMEM;
- goto error_indices_ht;
- }
-
- status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK;
- goto end;
-
-error_indices_ht:
- lttng_index_allocator_destroy(state->index_allocator);
- state->index_allocator = NULL;
-end:
- return status;
-}
-
-static
-void fini_error_accounting_state(struct error_accounting_state *state)
-{
- assert(state);
-
- /*
- * Will assert if some error counter indices were not released (an
- * internal error).
- */
- lttng_ht_destroy(state->indices_ht);
- lttng_index_allocator_destroy(state->index_allocator);
-}
-
-enum event_notifier_error_accounting_status
-event_notifier_error_accounting_init(uint64_t buffer_size_kernel,
- uint64_t buffer_size_ust)
-{
- enum event_notifier_error_accounting_status status;
-
- status = init_error_accounting_state(&kernel_state, buffer_size_kernel);
- if (status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) {
- ERR("Failed to initialize kernel event notifier accounting state: status = %s",
- error_accounting_status_str(status));
- goto end;
- }
-
- status = init_error_accounting_state(&ust_state, buffer_size_ust);
- if (status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) {
- ERR("Failed to initialize UST event notifier accounting state: status = %s",
- error_accounting_status_str(status));
- goto error_ust_state;
- }
-
- error_counter_uid_ht = lttng_ht_new(
- ERROR_COUNTER_INDEX_HT_INITIAL_SIZE, LTTNG_HT_TYPE_U64);
- if (!error_counter_uid_ht) {
- ERR("Failed to allocate UID to error counter accountant hash table");
- status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_NOMEM;
- goto error_uid_ht;
- }
-
- status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK;
- goto end;
-
-error_uid_ht:
- fini_error_accounting_state(&ust_state);
-error_ust_state:
- fini_error_accounting_state(&kernel_state);
-end:
- return status;
-}
-
-/*
- * Return the error counteur index associated to this event notifier tracer
- * token. Returns _STATUS_OK if found and _STATUS_NOT_FOUND otherwise.
- */
-static
-enum event_notifier_error_accounting_status get_error_counter_index_for_token(
- struct error_accounting_state *state, uint64_t tracer_token,
- uint64_t *error_counter_index)
-{
- struct lttng_ht_node_u64 *node;
- struct lttng_ht_iter iter;
- const struct index_ht_entry *index_entry;
- enum event_notifier_error_accounting_status status;
-
- rcu_read_lock();
- lttng_ht_lookup(state->indices_ht, &tracer_token, &iter);
- node = lttng_ht_iter_get_node_u64(&iter);
- if (node) {
- index_entry = caa_container_of(
- node, const struct index_ht_entry, node);
- *error_counter_index = index_entry->error_counter_index;
- status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK;
- } else {
- status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_NOT_FOUND;
- }
-
- rcu_read_unlock();
- return status;
-}
-
-#ifdef HAVE_LIBLTTNG_UST_CTL
-/*
- * Find the entry for this app's UID, the caller acquires a reference if the
- * entry is found.
- */
-static
-struct ust_error_accounting_entry *ust_error_accounting_entry_find(
- struct lttng_ht *uid_ht, const struct ust_app *app)
-{
- struct ust_error_accounting_entry *entry;
- struct lttng_ht_node_u64 *node;
- struct lttng_ht_iter iter;
- uint64_t key = app->uid;
-
- lttng_ht_lookup(uid_ht, &key, &iter);
- node = lttng_ht_iter_get_node_u64(&iter);
- if(node == NULL) {
- entry = NULL;
- } else {
- bool got_ref;
-
- entry = caa_container_of(node,
- struct ust_error_accounting_entry, node);
-
- got_ref = ust_error_accounting_entry_get(entry);
- if (!got_ref) {
- entry = NULL;
- }
- }
-
- return entry;
-}
-
-/*
- * Create the entry for this app's UID, the caller acquires a reference to the
- * entry,
- */
-static
-struct ust_error_accounting_entry *ust_error_accounting_entry_create(
- struct lttng_ht *uid_ht, const struct ust_app *app)
-{
- int i, ret, *cpu_counter_fds = NULL;
- struct lttng_ust_ctl_daemon_counter *daemon_counter;
- struct lttng_ust_abi_object_data *counter, **cpu_counters;
- struct ust_error_accounting_entry *entry = NULL;
- const struct lttng_ust_ctl_counter_dimension dimension = {
- .size = ust_state.number_indices,
- .has_underflow = false,
- .has_overflow = false,
- };
-
- entry = zmalloc(sizeof(struct ust_error_accounting_entry));
- if (!entry) {
- PERROR("Failed to allocate event notifier error acounting entry")
- goto error;
- }
-
- urcu_ref_init(&entry->ref);
- entry->uid = app->uid;
- entry->nr_counter_cpu_fds = lttng_ust_ctl_get_nr_cpu_per_counter();
-
- cpu_counter_fds = zmalloc(entry->nr_counter_cpu_fds * sizeof(*cpu_counter_fds));
- if (!cpu_counter_fds) {
- PERROR("Failed to allocate event notifier error counter file descriptors array: application uid = %d, application name = '%s', pid = %d, allocation size = %zu",
- (int) app->uid, app->name, (int) app->pid,
- entry->nr_counter_cpu_fds * sizeof(*cpu_counter_fds));
- goto error_counter_cpu_fds_alloc;
- }
-
- /* Initialize to an invalid fd value to closes fds in case of error. */
- for (i = 0; i < entry->nr_counter_cpu_fds; i++) {
- cpu_counter_fds[i] = -1;
- }
-
- cpu_counters = zmalloc(entry->nr_counter_cpu_fds * sizeof(struct lttng_ust_abi_object_data *));
- if (!cpu_counters) {
- PERROR("Failed to allocate event notifier error counter lttng_ust_abi_object_data array: application uid = %d, application name = '%s', pid = %d, allocation size = %zu",
- (int) app->uid, app->name, (int) app->pid,
- entry->nr_counter_cpu_fds * sizeof(struct lttng_ust_abi_object_data *));
- goto error_counter_cpus_alloc;
- }
-
- for (i = 0; i < entry->nr_counter_cpu_fds; i++) {
- cpu_counter_fds[i] = shm_create_anonymous("event-notifier-error-accounting");
- if (cpu_counter_fds[i] == -1) {
- ERR("Failed to create event notifier error accounting shared memory for application user: application uid = %d, pid = %d, application name = '%s'",
- (int) app->uid, (int) app->pid, app->name);
- goto error_shm_alloc;
- }
- }
-
- /*
- * Ownership of the file descriptors transferred to the ustctl object.
- */
- daemon_counter = lttng_ust_ctl_create_counter(1, &dimension, 0, -1,
- entry->nr_counter_cpu_fds, cpu_counter_fds,
- LTTNG_UST_CTL_COUNTER_BITNESS_32,
- LTTNG_UST_CTL_COUNTER_ARITHMETIC_MODULAR,
- LTTNG_UST_CTL_COUNTER_ALLOC_PER_CPU,
- false);
- if (!daemon_counter) {
- goto error_create_daemon_counter;
- }
-
- ret = lttng_ust_ctl_create_counter_data(daemon_counter, &counter);
- if (ret) {
- ERR("Failed to create userspace tracer counter data for application user: uid = %d, pid = %d, application name = '%s'",
- (int) app->uid, (int) app->pid, app->name);
- goto error_create_counter_data;
- }
-
- for (i = 0; i < entry->nr_counter_cpu_fds; i++) {
- ret = lttng_ust_ctl_create_counter_cpu_data(daemon_counter, i,
- &cpu_counters[i]);
- if (ret) {
- ERR("Failed to create userspace tracer counter cpu data for application user: uid = %d, pid = %d, application name = '%s'",
- (int) app->uid, (int) app->pid,
- app->name);
- goto error_create_counter_cpu_data;
- }
- }
-
- entry->daemon_counter = daemon_counter;
- entry->counter = counter;
- entry->cpu_counters = cpu_counters;
-
- lttng_ht_node_init_u64(&entry->node, entry->uid);
- lttng_ht_add_unique_u64(error_counter_uid_ht, &entry->node);
-
- goto end;
-
-error_create_counter_cpu_data:
- /* Teardown any allocated cpu counters. */
- for (i = 0; i < entry->nr_counter_cpu_fds; i++) {
- if (!cpu_counters[i]) {
- /*
- * Early-exit when error occurred before all cpu
- * counters could be initialized.
- */
- break;
- }
-
- lttng_ust_ctl_release_object(-1, cpu_counters[i]);
- free(cpu_counters[i]);
- }
-
- lttng_ust_ctl_release_object(-1, entry->counter);
- free(entry->counter);
-error_create_counter_data:
- lttng_ust_ctl_destroy_counter(daemon_counter);
-error_create_daemon_counter:
-error_shm_alloc:
- /* Error occured before per-cpu SHMs were handed-off to ustctl. */
- if (cpu_counter_fds) {
- for (i = 0; i < entry->nr_counter_cpu_fds; i++) {
- if (cpu_counter_fds[i] < 0) {
- /*
- * Early-exit when error occurred before all cpu
- * counter shm fds could be initialized.
- */
- break;
- }
-
- ret = close(cpu_counter_fds[i]);
- if (ret) {
- PERROR("Failed to close error counter per-CPU shm file descriptor: fd = %d",
- cpu_counter_fds[i]);
- }
- }
- }
-
- free(cpu_counters);
-error_counter_cpus_alloc:
-error_counter_cpu_fds_alloc:
- free(entry);
-error:
- entry = NULL;
-end:
- free(cpu_counter_fds);
- return entry;
-}
-
-static
-enum event_notifier_error_accounting_status send_counter_data_to_ust(
- struct ust_app *app,
- struct lttng_ust_abi_object_data *new_counter)
-{
- int ret;
- enum event_notifier_error_accounting_status status;
-
- /* Attach counter to trigger group. */
- pthread_mutex_lock(&app->sock_lock);
- ret = lttng_ust_ctl_send_counter_data_to_ust(app->sock,
- app->event_notifier_group.object->handle, new_counter);
- pthread_mutex_unlock(&app->sock_lock);
- if (ret < 0) {
- if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
- ERR("Failed to send counter data to application: application name = '%s', pid = %d, ret = %d",
- app->name, app->pid, ret);
- status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR;
- } else {
- DBG3("Failed to send counter data to application (application is dead): application name = '%s', pid = %d, ret = %d",
- app->name, app->pid, ret);
- status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_APP_DEAD;
- }
-
- goto end;
- }
-
- status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK;
-end:
- return status;
-}
-
-static
-enum event_notifier_error_accounting_status send_counter_cpu_data_to_ust(
- struct ust_app *app,
- struct lttng_ust_abi_object_data *counter,
- struct lttng_ust_abi_object_data *counter_cpu)
-{
- int ret;
- enum event_notifier_error_accounting_status status;
-
- pthread_mutex_lock(&app->sock_lock);
- ret = lttng_ust_ctl_send_counter_cpu_data_to_ust(app->sock,
- counter, counter_cpu);
- pthread_mutex_unlock(&app->sock_lock);
- if (ret < 0) {
- if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
- ERR("Failed to send counter CPU data to application: application name = '%s', pid = %d, ret = %d",
- app->name, app->pid, ret);
- status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR;
- } else {
- DBG3("Failed to send counter CPU data to application: application name = '%s', pid = %d, ret = %d",
- app->name, app->pid, ret);
- status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_APP_DEAD;
- }
-
- goto end;
- }
-
- status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK;
-end:
- return status;
-}
-
-enum event_notifier_error_accounting_status
-event_notifier_error_accounting_register_app(struct ust_app *app)
-{
- int ret;
- uint64_t i;
- struct lttng_ust_abi_object_data *new_counter;
- struct ust_error_accounting_entry *entry;
- enum event_notifier_error_accounting_status status;
- struct lttng_ust_abi_object_data **cpu_counters;
-
- /*
- * Check if we already have a error counter for the user id of this
- * app. If not, create one.
- */
- rcu_read_lock();
- entry = ust_error_accounting_entry_find(error_counter_uid_ht, app);
- if (entry == NULL) {
- /*
- * Take the event notifier counter lock before creating the new
- * entry to ensure that no event notifier is registered between
- * the the entry creation and event notifier count check.
- */
- pthread_mutex_lock(&the_event_notifier_counter.lock);
-
- entry = ust_error_accounting_entry_create(error_counter_uid_ht,
- app);
- if (!entry) {
- status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR;
- pthread_mutex_unlock(&the_event_notifier_counter.lock);
- goto error_creating_entry;
- }
-
- /*
- * We just created a new UID entry, If there are event
- * notifiers already registered, take one reference on their
- * behalf.
- */
- if (the_event_notifier_counter.count > 0) {
- ust_error_accounting_entry_get(entry);
- }
-
- pthread_mutex_unlock(&the_event_notifier_counter.lock);
- }
-
- /* Duplicate counter object data. */
- ret = lttng_ust_ctl_duplicate_ust_object_data(&new_counter,
- entry->counter);
- if (ret) {
- ERR("Failed to duplicate event notifier error accounting counter for application user: application uid = %d, pid = %d, application name = '%s'",
- (int) app->uid, (int) app->pid, app->name);
- status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR;
- goto error_duplicate_counter;
- }
-
- status = send_counter_data_to_ust(app, new_counter);
- if (status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) {
- if (status == EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_APP_DEAD) {
- goto error_send_counter_data;
- }
-
- ERR("Failed to send counter data to application tracer: status = %s, application uid = %d, pid = %d, application name = '%s'",
- error_accounting_status_str(status),
- (int) app->uid, (int) app->pid, app->name);
- status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR;
- goto error_send_counter_data;
- }
-
- cpu_counters = zmalloc(entry->nr_counter_cpu_fds * sizeof(struct lttng_ust_abi_object_data *));
- if (!cpu_counters) {
- PERROR("Failed to allocate event notifier error counter lttng_ust_abi_object_data array: application uid = %d, application name = '%s', pid = %d, allocation size = %zu",
- (int) app->uid, app->name, (int) app->pid,
- entry->nr_counter_cpu_fds * sizeof(**cpu_counters));
- status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_NOMEM;
- goto error_allocate_cpu_counters;
- }
-
- for (i = 0; i < entry->nr_counter_cpu_fds; i++) {
- struct lttng_ust_abi_object_data *new_counter_cpu = NULL;
-
- ret = lttng_ust_ctl_duplicate_ust_object_data(&new_counter_cpu,
- entry->cpu_counters[i]);
- if (ret) {
- ERR("Failed to duplicate userspace tracer counter cpu data for application user: uid = %d, pid = %d, application name = '%s'",
- (int) app->uid, (int) app->pid,
- app->name);
- status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_NOMEM;
- goto error_duplicate_cpu_counter;
- }
-
- cpu_counters[i] = new_counter_cpu;
-
- status = send_counter_cpu_data_to_ust(app, new_counter,
- new_counter_cpu);
- if (status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) {
- if (status == EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_APP_DEAD) {
- goto error_send_cpu_counter_data;
- }
-
- ERR("Failed to send counter cpu data to application tracer: status = %s, application uid = %d, pid = %d, application name = '%s'",
- error_accounting_status_str(status),
- (int) app->uid, (int) app->pid,
- app->name);
- status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR;
- goto error_send_cpu_counter_data;
- }
- }
-
- app->event_notifier_group.counter = new_counter;
- new_counter = NULL;
- app->event_notifier_group.nr_counter_cpu = entry->nr_counter_cpu_fds;
- app->event_notifier_group.counter_cpu = cpu_counters;
- cpu_counters = NULL;
- goto end;
-
-error_send_cpu_counter_data:
-error_duplicate_cpu_counter:
- /* Teardown any duplicated cpu counters. */
- for (i = 0; i < entry->nr_counter_cpu_fds; i++) {
- if (!cpu_counters[i]) {
- /*
- * Early-exit when error occurred before all cpu
- * counters could be initialized.
- */
- break;
- }
-
- lttng_ust_ctl_release_object(-1, cpu_counters[i]);
- free(cpu_counters[i]);
- }
-
- free(cpu_counters);
-
-error_allocate_cpu_counters:
-error_send_counter_data:
- lttng_ust_ctl_release_object(-1, new_counter);
- free(new_counter);
-error_duplicate_counter:
- ust_error_accounting_entry_put(entry);
-error_creating_entry:
- app->event_notifier_group.counter = NULL;
-end:
- rcu_read_unlock();
- return status;
-}
-
-enum event_notifier_error_accounting_status
-event_notifier_error_accounting_unregister_app(struct ust_app *app)
-{
- enum event_notifier_error_accounting_status status;
- struct ust_error_accounting_entry *entry;
- int i;
-
- rcu_read_lock();
-
- /* If an error occurred during app registration no entry was created. */
- if (!app->event_notifier_group.counter) {
- status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK;
- goto end;
- }
-
- entry = ust_error_accounting_entry_find(error_counter_uid_ht, app);
- if (entry == NULL) {
- ERR("Failed to find event notitifier error accounting entry on application teardown: pid = %d, application name = '%s'",
- app->pid, app->name);
- status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR;
- goto end;
- } else {
- /*
- * Put the entry twice as we acquired a reference from the
- * `ust_error_accounting_entry_find()` above.
- */
- ust_error_accounting_entry_put(entry);
- ust_error_accounting_entry_put(entry);
- }
-
- for (i = 0; i < app->event_notifier_group.nr_counter_cpu; i++) {
- lttng_ust_ctl_release_object(app->sock,
- app->event_notifier_group.counter_cpu[i]);
- free(app->event_notifier_group.counter_cpu[i]);
- }
-
- free(app->event_notifier_group.counter_cpu);
-
- lttng_ust_ctl_release_object(app->sock, app->event_notifier_group.counter);
- free(app->event_notifier_group.counter);
-
- status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK;
-end:
- rcu_read_unlock();
- return status;
-}
-
-static
-enum event_notifier_error_accounting_status
-event_notifier_error_accounting_ust_get_count(
- const struct lttng_trigger *trigger, uint64_t *count)
-{
- struct lttng_ht_iter iter;
- struct ust_error_accounting_entry *uid_entry;
- uint64_t error_counter_index, global_sum = 0;
- enum event_notifier_error_accounting_status status;
- size_t dimension_indexes[1];
- const uint64_t tracer_token = lttng_trigger_get_tracer_token(trigger);
- uid_t trigger_owner_uid;
- const char *trigger_name;
-
-
- rcu_read_lock();
-
- get_trigger_info_for_log(trigger, &trigger_name, &trigger_owner_uid);
-
- status = get_error_counter_index_for_token(&ust_state, tracer_token,
- &error_counter_index);
- if (status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) {
-
- ERR("Failed to retrieve index for tracer token: token = %" PRIu64 ", trigger name = '%s', trigger owner uid = %d, status = %s",
- tracer_token, trigger_name,
- (int) trigger_owner_uid,
- error_accounting_status_str(status));
- goto end;
- }
-
- dimension_indexes[0] = error_counter_index;
-
- /*
- * Iterate over all the UID entries.
- * We aggregate the value of all uid entries regardless of if the uid
- * matches the trigger's uid because a user that is allowed to register
- * a trigger to a given sessiond is also allowed to create an event
- * notifier on all apps that this sessiond is aware of.
- */
- cds_lfht_for_each_entry(error_counter_uid_ht->ht, &iter.iter,
- uid_entry, node.node) {
- int ret;
- int64_t local_value = 0;
- bool overflow = false, underflow = false;
-
- ret = lttng_ust_ctl_counter_aggregate(uid_entry->daemon_counter,
- dimension_indexes, &local_value, &overflow,
- &underflow);
- if (ret || local_value < 0) {
- if (ret) {
- ERR("Failed to aggregate event notifier error counter values of trigger: trigger name = '%s', trigger owner uid = %d",
- trigger_name,
- (int) trigger_owner_uid);
- } else if (local_value < 0) {
- ERR("Negative event notifier error counter value encountered during aggregation: trigger name = '%s', trigger owner uid = %d, value = %" PRId64,
- trigger_name,
- (int) trigger_owner_uid,
- local_value);
- } else {
- abort();
- }
-
- status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR;
- goto end;
- }
-
- /* Cast is safe as negative values are checked-for above. */
- global_sum += (uint64_t) local_value;
- }
-
- *count = global_sum;
- status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK;
-
-end:
- rcu_read_unlock();
- return status;
-}
-
-static
-enum event_notifier_error_accounting_status event_notifier_error_accounting_ust_clear(
- const struct lttng_trigger *trigger)
-{
- struct lttng_ht_iter iter;
- struct ust_error_accounting_entry *uid_entry;
- uint64_t error_counter_index;
- enum event_notifier_error_accounting_status status;
- size_t dimension_index;
- const uint64_t tracer_token = lttng_trigger_get_tracer_token(trigger);
-
- rcu_read_lock();
- status = get_error_counter_index_for_token(&ust_state, tracer_token,
- &error_counter_index);
- if (status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) {
- uid_t trigger_owner_uid;
- const char *trigger_name;
-
- get_trigger_info_for_log(trigger, &trigger_name,
- &trigger_owner_uid);
-
- ERR("Failed to retrieve index for tracer token: token = %" PRIu64 ", trigger name = '%s', trigger owner uid = %d, status = %s",
- tracer_token, trigger_name,
- (int) trigger_owner_uid,
- error_accounting_status_str(status));
- goto end;
- }
-
- dimension_index = error_counter_index;
-
- /*
- * Go over all error counters (ignoring uid) as a trigger (and trigger
- * errors) can be generated from any applications that this session
- * daemon is managing.
- */
- cds_lfht_for_each_entry(error_counter_uid_ht->ht, &iter.iter,
- uid_entry, node.node) {
- const int ret = lttng_ust_ctl_counter_clear(uid_entry->daemon_counter,
- &dimension_index);
-
- if (ret) {
- uid_t trigger_owner_uid;
- const char *trigger_name;
-
- get_trigger_info_for_log(trigger, &trigger_name,
- &trigger_owner_uid);
- ERR("Failed to clear event notifier counter value for trigger: counter uid = %d, trigger name = '%s', trigger owner uid = %d",
- (int) uid_entry->node.key, trigger_name,
- (int) trigger_owner_uid);
- status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR;
- goto end;
- }
- }
-
- status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK;
-end:
- rcu_read_unlock();
- return status;
-}
-#endif /* HAVE_LIBLTTNG_UST_CTL */
-
-static
-enum event_notifier_error_accounting_status
-event_notifier_error_accounting_kernel_clear(
- const struct lttng_trigger *trigger)
-{
- int ret;
- uint64_t error_counter_index;
- enum event_notifier_error_accounting_status status;
- struct lttng_kernel_abi_counter_clear counter_clear = {};
-
- status = get_error_counter_index_for_token(&kernel_state,
- lttng_trigger_get_tracer_token(trigger),
- &error_counter_index);
- if (status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) {
- uid_t trigger_owner_uid;
- const char *trigger_name;
-
- get_trigger_info_for_log(
- trigger, &trigger_name, &trigger_owner_uid);
-
- ERR("Failed to get event notifier error counter index: trigger owner uid = %d, trigger name = '%s', status = '%s'",
- trigger_owner_uid, trigger_name,
- error_accounting_status_str(status));
- goto end;
- }
-
- counter_clear.index.number_dimensions = 1;
- counter_clear.index.dimension_indexes[0] = error_counter_index;
-
- ret = kernctl_counter_clear(
- kernel_error_accounting_entry.error_counter_fd,
- &counter_clear);
- if (ret) {
- uid_t trigger_owner_uid;
- const char *trigger_name;
-
- get_trigger_info_for_log(
- trigger, &trigger_name, &trigger_owner_uid);
-
- ERR("Failed to clear kernel event notifier error counter: trigger owner uid = %d, trigger name = '%s'",
- trigger_owner_uid, trigger_name);
- status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR;
- goto end;
- }
-
- status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK;
-end:
- return status;
-}
-
-enum event_notifier_error_accounting_status
-event_notifier_error_accounting_register_kernel(
- int kernel_event_notifier_group_fd)
-{
- int error_counter_fd = -1, ret;
- enum event_notifier_error_accounting_status status;
- const struct lttng_kernel_abi_counter_conf error_counter_conf = {
- .arithmetic = LTTNG_KERNEL_ABI_COUNTER_ARITHMETIC_MODULAR,
- .bitness = sizeof(void *) == sizeof(uint32_t) ?
- LTTNG_KERNEL_ABI_COUNTER_BITNESS_32 :
- LTTNG_KERNEL_ABI_COUNTER_BITNESS_64,
- .global_sum_step = 0,
- .number_dimensions = 1,
- .dimensions[0].size = kernel_state.number_indices,
- .dimensions[0].has_underflow = false,
- .dimensions[0].has_overflow = false,
- };
-
- ret = kernctl_create_event_notifier_group_error_counter(
- kernel_event_notifier_group_fd, &error_counter_conf);
- if (ret < 0) {
- PERROR("Failed to create event notifier group error counter through kernel ioctl: kernel_event_notifier_group_fd = %d",
- kernel_event_notifier_group_fd);
- status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR;
- goto error;
- }
-
- error_counter_fd = ret;
-
- /* Prevent fd duplication after execlp(). */
- ret = fcntl(error_counter_fd, F_SETFD, FD_CLOEXEC);
- if (ret < 0) {
- PERROR("Failed to set FD_CLOEXEC flag on event notifier error counter file descriptor: error_counter_fd = %d",
- error_counter_fd);
- status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR;
- goto error;
- }
-
- DBG("Created kernel event notifier group error counter: fd = %d",
- error_counter_fd);
-
- kernel_error_accounting_entry.error_counter_fd =
- error_counter_fd;
- status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK;
-
-error:
- return status;
-}
-
-static
-enum event_notifier_error_accounting_status create_error_counter_index_for_token(
- struct error_accounting_state *state, uint64_t tracer_token,
- uint64_t *error_counter_index)
-{
- struct index_ht_entry *index_entry;
- enum lttng_index_allocator_status index_alloc_status;
- uint64_t local_error_counter_index;
- enum event_notifier_error_accounting_status status;
-
- assert(state);
-
- /* Allocate a new index for that counter. */
- index_alloc_status = lttng_index_allocator_alloc(state->index_allocator,
- &local_error_counter_index);
- switch (index_alloc_status) {
- case LTTNG_INDEX_ALLOCATOR_STATUS_EMPTY:
- DBG("No indices left in the configured event notifier error counter: "
- "number-of-indices = %"PRIu64,
- lttng_index_allocator_get_index_count(
- state->index_allocator));
- status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_NO_INDEX_AVAILABLE;
- goto end;
- case LTTNG_INDEX_ALLOCATOR_STATUS_OK:
- break;
- default:
- status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR;
- goto end;
- }
-
- index_entry = zmalloc(sizeof(*index_entry));
- if (index_entry == NULL) {
- PERROR("Failed to allocate event notifier error counter hash table entry");
- status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_NOMEM;
- goto end;
- }
-
- index_entry->error_counter_index = local_error_counter_index;
- lttng_ht_node_init_u64(&index_entry->node, tracer_token);
- lttng_ht_add_unique_u64(state->indices_ht, &index_entry->node);
-
- DBG("Allocated error counter index for tracer token: tracer token = %" PRIu64 ", index = %" PRIu64,
- tracer_token, local_error_counter_index);
- *error_counter_index = local_error_counter_index;
- status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK;
-end:
- return status;
-}
-
-enum event_notifier_error_accounting_status
-event_notifier_error_accounting_register_event_notifier(
- const struct lttng_trigger *trigger,
- uint64_t *error_counter_index)
-{
- enum event_notifier_error_accounting_status status;
- uint64_t local_error_counter_index;
- struct error_accounting_state *state;
-
- switch (lttng_trigger_get_underlying_domain_type_restriction(trigger)) {
- case LTTNG_DOMAIN_KERNEL:
- state = &kernel_state;
- break;
- case LTTNG_DOMAIN_UST:
- state = &ust_state;
- break;
- default:
- abort();
- }
-
- /*
- * Check if this event notifier already has a error counter index
- * assigned.
- */
- status = get_error_counter_index_for_token(state,
- lttng_trigger_get_tracer_token(trigger),
- &local_error_counter_index);
- switch (status) {
- case EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_NOT_FOUND:
- {
- uid_t trigger_owner_uid;
- const char *trigger_name;
-
- get_trigger_info_for_log(
- trigger, &trigger_name, &trigger_owner_uid);
-
- DBG("Event notifier error counter index not found for tracer token (allocating a new one): trigger name = '%s', trigger owner uid = %d, tracer token = %" PRIu64,
- trigger_name, trigger_owner_uid,
- lttng_trigger_get_tracer_token(trigger));
-
- status = create_error_counter_index_for_token(state,
- lttng_trigger_get_tracer_token(trigger),
- &local_error_counter_index);
- if (status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) {
- ERR("Error creating index for token: status = %s, trigger name = '%s', trigger owner uid = %d",
- error_accounting_status_str(status),
- trigger_name, trigger_owner_uid);
- goto end;
- }
- /* fall-through. */
- }
- case EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK:
- *error_counter_index = local_error_counter_index;
- status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK;
- break;
- default:
- break;
- }
-
-#ifdef HAVE_LIBLTTNG_UST_CTL
- switch (lttng_trigger_get_underlying_domain_type_restriction(trigger)) {
- case LTTNG_DOMAIN_UST:
- pthread_mutex_lock(&the_event_notifier_counter.lock);
- the_event_notifier_counter.count++;
- if (the_event_notifier_counter.count == 1) {
- /*
- * On the first event notifier, we get a reference to
- * every existing UID entries. This ensures that the
- * entries are kept around if there are still
- * registered event notifiers but no apps.
- */
- get_ref_all_ust_error_accounting_entry();
- }
- pthread_mutex_unlock(&the_event_notifier_counter.lock);
- break;
- default:
- break;
- }
-#endif /* HAVE_LIBLTTNG_UST_CTL */
-
-
-end:
- return status;
-}
-
-static
-enum event_notifier_error_accounting_status
-event_notifier_error_accounting_kernel_get_count(
- const struct lttng_trigger *trigger, uint64_t *count)
-{
- struct lttng_kernel_abi_counter_aggregate counter_aggregate = {};
- enum event_notifier_error_accounting_status status;
- uint64_t error_counter_index;
- int ret;
-
- status = get_error_counter_index_for_token(&kernel_state,
- lttng_trigger_get_tracer_token(trigger),
- &error_counter_index);
- if (status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) {
- ERR("Error getting index for token: status=%s",
- error_accounting_status_str(status));
- goto end;
- }
-
- counter_aggregate.index.number_dimensions = 1;
- counter_aggregate.index.dimension_indexes[0] = error_counter_index;
-
- assert(kernel_error_accounting_entry.error_counter_fd);
-
- ret = kernctl_counter_get_aggregate_value(
- kernel_error_accounting_entry.error_counter_fd,
- &counter_aggregate);
- if (ret || counter_aggregate.value.value < 0) {
- uid_t trigger_owner_uid;
- const char *trigger_name;
-
- get_trigger_info_for_log(trigger, &trigger_name,
- &trigger_owner_uid);
-
- if (counter_aggregate.value.value < 0) {
- ERR("Invalid negative event notifier error counter value: trigger owner = %d, trigger name = '%s', value = %" PRId64,
- trigger_owner_uid, trigger_name,
- counter_aggregate.value.value);
- } else {
- ERR("Failed to getting event notifier error count: trigger owner = %d, trigger name = '%s', ret = %d",
- trigger_owner_uid, trigger_name, ret);
- }
-
- status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_ERR;
- goto end;
- }
-
- /* Error count can't be negative. */
- assert(counter_aggregate.value.value >= 0);
- *count = (uint64_t) counter_aggregate.value.value;
-
- status = EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK;
-
-end:
- return status;
-}
-
-enum event_notifier_error_accounting_status
-event_notifier_error_accounting_get_count(
- const struct lttng_trigger *trigger, uint64_t *count)
-{
- switch (lttng_trigger_get_underlying_domain_type_restriction(trigger)) {
- case LTTNG_DOMAIN_KERNEL:
- return event_notifier_error_accounting_kernel_get_count(
- trigger, count);
- case LTTNG_DOMAIN_UST:
-#ifdef HAVE_LIBLTTNG_UST_CTL
- return event_notifier_error_accounting_ust_get_count(trigger,
- count);
-#else
- *count = 0;
- return EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK;
-#endif /* HAVE_LIBLTTNG_UST_CTL */
- default:
- abort();
- }
-}
-
-static
-enum event_notifier_error_accounting_status
-event_notifier_error_accounting_clear(const struct lttng_trigger *trigger)
-{
- switch (lttng_trigger_get_underlying_domain_type_restriction(trigger)) {
- case LTTNG_DOMAIN_KERNEL:
- return event_notifier_error_accounting_kernel_clear(trigger);
- case LTTNG_DOMAIN_UST:
-#ifdef HAVE_LIBLTTNG_UST_CTL
- return event_notifier_error_accounting_ust_clear(trigger);
-#else
- return EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK;
-#endif /* HAVE_LIBLTTNG_UST_CTL */
- default:
- abort();
- }
-}
-
-static void free_index_ht_entry(struct rcu_head *head)
-{
- struct index_ht_entry *entry = caa_container_of(head,
- struct index_ht_entry, rcu_head);
-
- free(entry);
-}
-
-void event_notifier_error_accounting_unregister_event_notifier(
- const struct lttng_trigger *trigger)
-{
- struct lttng_ht_iter iter;
- struct lttng_ht_node_u64 *node;
- const uint64_t tracer_token = lttng_trigger_get_tracer_token(trigger);
- enum event_notifier_error_accounting_status status;
- struct error_accounting_state *state;
-
- status = event_notifier_error_accounting_clear(trigger);
- if (status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) {
- /* Trigger details already logged by callee on error. */
- ERR("Failed to clear event notifier error counter during unregistration of event notifier: status = '%s'",
- error_accounting_status_str(status));
- goto end;
- }
-
- rcu_read_lock();
-
- switch (lttng_trigger_get_underlying_domain_type_restriction(trigger)) {
- case LTTNG_DOMAIN_KERNEL:
- state = &kernel_state;
- break;
-#ifdef HAVE_LIBLTTNG_UST_CTL
- case LTTNG_DOMAIN_UST:
- state = &ust_state;
-
- pthread_mutex_lock(&the_event_notifier_counter.lock);
- the_event_notifier_counter.count--;
- if (the_event_notifier_counter.count == 0) {
-
- /*
- * When unregistering the last event notifier, put one
- * reference to every uid entries on the behalf of all
- * event notifiers.
- */
- put_ref_all_ust_error_accounting_entry();
- }
-
- pthread_mutex_unlock(&the_event_notifier_counter.lock);
-
- break;
-#endif /* HAVE_LIBLTTNG_UST_CTL */
- default:
- abort();
- }
-
- lttng_ht_lookup(state->indices_ht, &tracer_token, &iter);
- node = lttng_ht_iter_get_node_u64(&iter);
- if (node) {
- int del_ret;
- struct index_ht_entry *index_entry = caa_container_of(
- node, typeof(*index_entry), node);
- enum lttng_index_allocator_status index_alloc_status;
-
- index_alloc_status = lttng_index_allocator_release(
- state->index_allocator,
- index_entry->error_counter_index);
- if (index_alloc_status != LTTNG_INDEX_ALLOCATOR_STATUS_OK) {
- uid_t trigger_owner_uid;
- const char *trigger_name;
-
- get_trigger_info_for_log(trigger, &trigger_name,
- &trigger_owner_uid);
-
- ERR("Failed to release event notifier error counter index: index = %" PRIu64 ", trigger name = '%s', trigger owner uid = %d",
- index_entry->error_counter_index,
- trigger_name, (int) trigger_owner_uid);
- /* Don't exit, perform the rest of the clean-up. */
- }
-
- del_ret = lttng_ht_del(state->indices_ht, &iter);
- assert(!del_ret);
- call_rcu(&index_entry->rcu_head, free_index_ht_entry);
- }
-
-end:
- rcu_read_unlock();
-}
-
-void event_notifier_error_accounting_fini(void)
-{
- if (kernel_error_accounting_entry.error_counter_fd) {
- const int ret = close(kernel_error_accounting_entry.error_counter_fd);
-
- if (ret) {
- PERROR("Failed to close kernel event notifier error counter");
- }
- }
-
- lttng_ht_destroy(error_counter_uid_ht);
-
- fini_error_accounting_state(&kernel_state);
- fini_error_accounting_state(&ust_state);
-}
projects / lttng-tools.git / blobdiff