#include <linux/file.h>
#include <linux/anon_inodes.h>
#include <wrapper/file.h>
-#include <linux/jhash.h>
#include <linux/uaccess.h>
#include <linux/vmalloc.h>
#include <linux/dmi.h>
#include <wrapper/types.h>
#include <lttng/kernel-version.h>
#include <lttng/events.h>
+#include <lttng/lttng-bytecode.h>
#include <lttng/tracer.h>
+#include <lttng/event-notifier-notification.h>
#include <lttng/abi-old.h>
#include <lttng/endian.h>
#include <lttng/string-utils.h>
+#include <lttng/utils.h>
#include <ringbuffer/backend.h>
#include <ringbuffer/frontend.h>
#include <wrapper/time.h>
#define METADATA_CACHE_DEFAULT_SIZE 4096
static LIST_HEAD(sessions);
+static LIST_HEAD(event_notifier_groups);
static LIST_HEAD(lttng_transport_list);
/*
* Protect the sessions and metadata caches.
*/
static DEFINE_MUTEX(sessions_mutex);
static struct kmem_cache *event_cache;
+static struct kmem_cache *event_notifier_cache;
static void lttng_session_lazy_sync_event_enablers(struct lttng_session *session);
static void lttng_session_sync_event_enablers(struct lttng_session *session);
static void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler);
+static void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler *event_notifier_enabler);
+static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group);
static void _lttng_event_destroy(struct lttng_event *event);
+static void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier);
static void _lttng_channel_destroy(struct lttng_channel *chan);
static int _lttng_event_unregister(struct lttng_event *event);
+static int _lttng_event_notifier_unregister(struct lttng_event_notifier *event_notifier);
static
int _lttng_event_metadata_statedump(struct lttng_session *session,
struct lttng_channel *chan,
mutex_unlock(&sessions_mutex);
}
+static struct lttng_transport *lttng_transport_find(const char *name)
+{
+ struct lttng_transport *transport;
+
+ list_for_each_entry(transport, <tng_transport_list, node) {
+ if (!strcmp(transport->name, name))
+ return transport;
+ }
+ return NULL;
+}
+
/*
* Called with sessions lock held.
*/
return NULL;
}
+struct lttng_event_notifier_group *lttng_event_notifier_group_create(void)
+{
+ struct lttng_transport *transport = NULL;
+ struct lttng_event_notifier_group *event_notifier_group;
+ const char *transport_name = "relay-event-notifier";
+ size_t subbuf_size = 4096; //TODO
+ size_t num_subbuf = 16; //TODO
+ unsigned int switch_timer_interval = 0;
+ unsigned int read_timer_interval = 0;
+ int i;
+
+ mutex_lock(&sessions_mutex);
+
+ transport = lttng_transport_find(transport_name);
+ if (!transport) {
+ printk(KERN_WARNING "LTTng: transport %s not found\n",
+ transport_name);
+ goto notransport;
+ }
+ if (!try_module_get(transport->owner)) {
+ printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n",
+ transport_name);
+ goto notransport;
+ }
+
+ event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group),
+ GFP_KERNEL);
+ if (!event_notifier_group)
+ goto nomem;
+
+ /*
+ * Initialize the ring buffer used to store event notifier
+ * notifications.
+ */
+ event_notifier_group->ops = &transport->ops;
+ event_notifier_group->chan = transport->ops.channel_create(
+ transport_name, event_notifier_group, NULL,
+ subbuf_size, num_subbuf, switch_timer_interval,
+ read_timer_interval);
+ if (!event_notifier_group->chan)
+ goto create_error;
+
+ event_notifier_group->transport = transport;
+
+ INIT_LIST_HEAD(&event_notifier_group->enablers_head);
+ INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head);
+ for (i = 0; i < LTTNG_EVENT_NOTIFIER_HT_SIZE; i++)
+ INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]);
+
+ list_add(&event_notifier_group->node, &event_notifier_groups);
+
+ mutex_unlock(&sessions_mutex);
+
+ return event_notifier_group;
+
+create_error:
+ lttng_kvfree(event_notifier_group);
+nomem:
+ if (transport)
+ module_put(transport->owner);
+notransport:
+ mutex_unlock(&sessions_mutex);
+ return NULL;
+}
+
void metadata_cache_destroy(struct kref *kref)
{
struct lttng_metadata_cache *cache =
mutex_lock(&sessions_mutex);
WRITE_ONCE(session->active, 0);
list_for_each_entry(chan, &session->chan, list) {
- ret = lttng_syscalls_unregister(chan);
+ ret = lttng_syscalls_unregister_event(chan);
WARN_ON(ret);
}
list_for_each_entry(event, &session->events, list) {
}
synchronize_trace(); /* Wait for in-flight events to complete */
list_for_each_entry(chan, &session->chan, list) {
- ret = lttng_syscalls_destroy(chan);
+ ret = lttng_syscalls_destroy_event(chan);
WARN_ON(ret);
}
list_for_each_entry_safe(event_enabler, tmp_event_enabler,
lttng_kvfree(session);
}
+void lttng_event_notifier_group_destroy(
+ struct lttng_event_notifier_group *event_notifier_group)
+{
+ struct lttng_event_notifier_enabler *event_notifier_enabler, *tmp_event_notifier_enabler;
+ struct lttng_event_notifier *event_notifier, *tmpevent_notifier;
+ int ret;
+
+ if (!event_notifier_group)
+ return;
+
+ mutex_lock(&sessions_mutex);
+
+ ret = lttng_syscalls_unregister_event_notifier(event_notifier_group);
+ WARN_ON(ret);
+
+ list_for_each_entry_safe(event_notifier, tmpevent_notifier,
+ &event_notifier_group->event_notifiers_head, list) {
+ ret = _lttng_event_notifier_unregister(event_notifier);
+ WARN_ON(ret);
+ }
+
+ /* Wait for in-flight event notifier to complete */
+ synchronize_trace();
+
+ irq_work_sync(&event_notifier_group->wakeup_pending);
+
+ kfree(event_notifier_group->sc_filter);
+
+ list_for_each_entry_safe(event_notifier_enabler, tmp_event_notifier_enabler,
+ &event_notifier_group->enablers_head, node)
+ lttng_event_notifier_enabler_destroy(event_notifier_enabler);
+
+ list_for_each_entry_safe(event_notifier, tmpevent_notifier,
+ &event_notifier_group->event_notifiers_head, list)
+ _lttng_event_notifier_destroy(event_notifier);
+
+ event_notifier_group->ops->channel_destroy(event_notifier_group->chan);
+ module_put(event_notifier_group->transport->owner);
+ list_del(&event_notifier_group->node);
+
+ mutex_unlock(&sessions_mutex);
+ lttng_kvfree(event_notifier_group);
+}
+
int lttng_session_statedump(struct lttng_session *session)
{
int ret;
return ret;
}
-static struct lttng_transport *lttng_transport_find(const char *name)
+int lttng_event_notifier_enable(struct lttng_event_notifier *event_notifier)
{
- struct lttng_transport *transport;
+ int ret = 0;
- list_for_each_entry(transport, <tng_transport_list, node) {
- if (!strcmp(transport->name, name))
- return transport;
+ mutex_lock(&sessions_mutex);
+ if (event_notifier->enabled) {
+ ret = -EEXIST;
+ goto end;
}
- return NULL;
+ switch (event_notifier->instrumentation) {
+ case LTTNG_KERNEL_TRACEPOINT:
+ case LTTNG_KERNEL_SYSCALL:
+ ret = -EINVAL;
+ break;
+ case LTTNG_KERNEL_KPROBE:
+ case LTTNG_KERNEL_UPROBE:
+ WRITE_ONCE(event_notifier->enabled, 1);
+ break;
+ case LTTNG_KERNEL_FUNCTION:
+ case LTTNG_KERNEL_NOOP:
+ case LTTNG_KERNEL_KRETPROBE:
+ default:
+ WARN_ON_ONCE(1);
+ ret = -EINVAL;
+ }
+end:
+ mutex_unlock(&sessions_mutex);
+ return ret;
+}
+
+int lttng_event_notifier_disable(struct lttng_event_notifier *event_notifier)
+{
+ int ret = 0;
+
+ mutex_lock(&sessions_mutex);
+ if (!event_notifier->enabled) {
+ ret = -EEXIST;
+ goto end;
+ }
+ switch (event_notifier->instrumentation) {
+ case LTTNG_KERNEL_TRACEPOINT:
+ case LTTNG_KERNEL_SYSCALL:
+ ret = -EINVAL;
+ break;
+ case LTTNG_KERNEL_KPROBE:
+ case LTTNG_KERNEL_UPROBE:
+ WRITE_ONCE(event_notifier->enabled, 0);
+ break;
+ case LTTNG_KERNEL_FUNCTION:
+ case LTTNG_KERNEL_NOOP:
+ case LTTNG_KERNEL_KRETPROBE:
+ default:
+ WARN_ON_ONCE(1);
+ ret = -EINVAL;
+ }
+end:
+ mutex_unlock(&sessions_mutex);
+ return ret;
}
struct lttng_channel *lttng_channel_create(struct lttng_session *session,
struct lttng_event *event;
const char *event_name;
struct hlist_head *head;
- size_t name_len;
- uint32_t hash;
int ret;
if (chan->free_event_id == -1U) {
ret = -EINVAL;
goto type_error;
}
- name_len = strlen(event_name);
- hash = jhash(event_name, name_len, 0);
- head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)];
+
+ head = utils_borrow_hash_table_bucket(session->events_ht.table,
+ LTTNG_EVENT_HT_SIZE, event_name);
lttng_hlist_for_each_entry(event, head, hlist) {
WARN_ON_ONCE(!event->desc);
if (!strncmp(event->desc->name, event_name,
event->id = chan->free_event_id++;
event->instrumentation = itype;
event->evtype = LTTNG_TYPE_EVENT;
- INIT_LIST_HEAD(&event->bytecode_runtime_head);
+ INIT_LIST_HEAD(&event->filter_bytecode_runtime_head);
INIT_LIST_HEAD(&event->enablers_ref_head);
switch (itype) {
/* Event will be enabled by enabler sync. */
event->enabled = 0;
event->registered = 0;
- event->desc = lttng_event_get(event_name);
+ event->desc = lttng_event_desc_get(event_name);
if (!event->desc) {
ret = -ENOENT;
goto register_error;
* registration.
*/
smp_wmb();
- ret = lttng_kprobes_register(event_name,
+ ret = lttng_kprobes_register_event(event_name,
event_param->u.kprobe.symbol_name,
event_param->u.kprobe.offset,
event_param->u.kprobe.addr,
*/
smp_wmb();
- ret = lttng_uprobes_register(event_param->name,
+ ret = lttng_uprobes_register_event(event_param->name,
event_param->u.uprobe.fd,
event);
if (ret)
return ERR_PTR(ret);
}
+struct lttng_event_notifier *_lttng_event_notifier_create(
+ const struct lttng_event_desc *event_desc,
+ uint64_t token, struct lttng_event_notifier_group *event_notifier_group,
+ struct lttng_kernel_event_notifier *event_notifier_param,
+ void *filter, enum lttng_kernel_instrumentation itype)
+{
+ struct lttng_event_notifier *event_notifier;
+ const char *event_name;
+ struct hlist_head *head;
+ int ret;
+
+ switch (itype) {
+ case LTTNG_KERNEL_TRACEPOINT:
+ event_name = event_desc->name;
+ break;
+ case LTTNG_KERNEL_KPROBE:
+ case LTTNG_KERNEL_UPROBE:
+ case LTTNG_KERNEL_SYSCALL:
+ event_name = event_notifier_param->event.name;
+ break;
+ case LTTNG_KERNEL_KRETPROBE:
+ case LTTNG_KERNEL_FUNCTION:
+ case LTTNG_KERNEL_NOOP:
+ default:
+ WARN_ON_ONCE(1);
+ ret = -EINVAL;
+ goto type_error;
+ }
+
+ head = utils_borrow_hash_table_bucket(event_notifier_group->event_notifiers_ht.table,
+ LTTNG_EVENT_NOTIFIER_HT_SIZE, event_name);
+ lttng_hlist_for_each_entry(event_notifier, head, hlist) {
+ WARN_ON_ONCE(!event_notifier->desc);
+ if (!strncmp(event_notifier->desc->name, event_name,
+ LTTNG_KERNEL_SYM_NAME_LEN - 1)
+ && event_notifier_group == event_notifier->group
+ && token == event_notifier->user_token) {
+ ret = -EEXIST;
+ goto exist;
+ }
+ }
+
+ event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL);
+ if (!event_notifier) {
+ ret = -ENOMEM;
+ goto cache_error;
+ }
+
+ event_notifier->group = event_notifier_group;
+ event_notifier->user_token = token;
+ event_notifier->num_captures = 0;
+ event_notifier->filter = filter;
+ event_notifier->instrumentation = itype;
+ event_notifier->evtype = LTTNG_TYPE_EVENT;
+ event_notifier->send_notification = lttng_event_notifier_notification_send;
+ INIT_LIST_HEAD(&event_notifier->filter_bytecode_runtime_head);
+ INIT_LIST_HEAD(&event_notifier->capture_bytecode_runtime_head);
+ INIT_LIST_HEAD(&event_notifier->enablers_ref_head);
+
+ switch (itype) {
+ case LTTNG_KERNEL_TRACEPOINT:
+ /* Event will be enabled by enabler sync. */
+ event_notifier->enabled = 0;
+ event_notifier->registered = 0;
+ event_notifier->desc = lttng_event_desc_get(event_name);
+ if (!event_notifier->desc) {
+ ret = -ENOENT;
+ goto register_error;
+ }
+ /* Populate lttng_event_notifier structure before event registration. */
+ smp_wmb();
+ break;
+ case LTTNG_KERNEL_KPROBE:
+ /*
+ * Needs to be explicitly enabled after creation, since
+ * we may want to apply filters.
+ */
+ event_notifier->enabled = 0;
+ event_notifier->registered = 1;
+ /*
+ * Populate lttng_event_notifier structure before event
+ * registration.
+ */
+ smp_wmb();
+ ret = lttng_kprobes_register_event_notifier(
+ event_notifier_param->event.u.kprobe.symbol_name,
+ event_notifier_param->event.u.kprobe.offset,
+ event_notifier_param->event.u.kprobe.addr,
+ event_notifier);
+ if (ret) {
+ ret = -EINVAL;
+ goto register_error;
+ }
+ ret = try_module_get(event_notifier->desc->owner);
+ WARN_ON_ONCE(!ret);
+ break;
+ case LTTNG_KERNEL_NOOP:
+ case LTTNG_KERNEL_SYSCALL:
+ /*
+ * Needs to be explicitly enabled after creation, since
+ * we may want to apply filters.
+ */
+ event_notifier->enabled = 0;
+ event_notifier->registered = 0;
+ event_notifier->desc = event_desc;
+ switch (event_notifier_param->event.u.syscall.entryexit) {
+ case LTTNG_KERNEL_SYSCALL_ENTRYEXIT:
+ ret = -EINVAL;
+ goto register_error;
+ case LTTNG_KERNEL_SYSCALL_ENTRY:
+ event_notifier->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
+ break;
+ case LTTNG_KERNEL_SYSCALL_EXIT:
+ event_notifier->u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
+ break;
+ }
+ switch (event_notifier_param->event.u.syscall.abi) {
+ case LTTNG_KERNEL_SYSCALL_ABI_ALL:
+ ret = -EINVAL;
+ goto register_error;
+ case LTTNG_KERNEL_SYSCALL_ABI_NATIVE:
+ event_notifier->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
+ break;
+ case LTTNG_KERNEL_SYSCALL_ABI_COMPAT:
+ event_notifier->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
+ break;
+ }
+
+ if (!event_notifier->desc) {
+ ret = -EINVAL;
+ goto register_error;
+ }
+ break;
+ case LTTNG_KERNEL_UPROBE:
+ /*
+ * Needs to be explicitly enabled after creation, since
+ * we may want to apply filters.
+ */
+ event_notifier->enabled = 0;
+ event_notifier->registered = 1;
+
+ /*
+ * Populate lttng_event_notifier structure before
+ * event_notifier registration.
+ */
+ smp_wmb();
+
+ ret = lttng_uprobes_register_event_notifier(
+ event_notifier_param->event.name,
+ event_notifier_param->event.u.uprobe.fd,
+ event_notifier);
+ if (ret)
+ goto register_error;
+ ret = try_module_get(event_notifier->desc->owner);
+ WARN_ON_ONCE(!ret);
+ break;
+ case LTTNG_KERNEL_KRETPROBE:
+ case LTTNG_KERNEL_FUNCTION:
+ default:
+ WARN_ON_ONCE(1);
+ ret = -EINVAL;
+ goto register_error;
+ }
+
+ list_add(&event_notifier->list, &event_notifier_group->event_notifiers_head);
+ hlist_add_head(&event_notifier->hlist, head);
+ return event_notifier;
+
+register_error:
+ kmem_cache_free(event_notifier_cache, event_notifier);
+cache_error:
+exist:
+type_error:
+ return ERR_PTR(ret);
+}
+
struct lttng_event *lttng_event_create(struct lttng_channel *chan,
struct lttng_kernel_event *event_param,
void *filter,
return event;
}
+struct lttng_event_notifier *lttng_event_notifier_create(
+ const struct lttng_event_desc *event_desc,
+ uint64_t id, struct lttng_event_notifier_group *event_notifier_group,
+ struct lttng_kernel_event_notifier *event_notifier_param,
+ void *filter, enum lttng_kernel_instrumentation itype)
+{
+ struct lttng_event_notifier *event_notifier;
+
+ mutex_lock(&sessions_mutex);
+ event_notifier = _lttng_event_notifier_create(event_desc, id,
+ event_notifier_group, event_notifier_param, filter, itype);
+ mutex_unlock(&sessions_mutex);
+ return event_notifier;
+}
+
/* Only used for tracepoints for now. */
static
void register_event(struct lttng_event *event)
event);
break;
case LTTNG_KERNEL_SYSCALL:
- ret = lttng_syscall_filter_enable(event->chan, event);
+ ret = lttng_syscall_filter_enable_event(event->chan, event);
break;
case LTTNG_KERNEL_KPROBE:
case LTTNG_KERNEL_UPROBE:
event);
break;
case LTTNG_KERNEL_KPROBE:
- lttng_kprobes_unregister(event);
+ lttng_kprobes_unregister_event(event);
ret = 0;
break;
case LTTNG_KERNEL_KRETPROBE:
ret = 0;
break;
case LTTNG_KERNEL_SYSCALL:
- ret = lttng_syscall_filter_disable(event->chan, event);
+ ret = lttng_syscall_filter_disable_event(event->chan, event);
break;
case LTTNG_KERNEL_NOOP:
ret = 0;
break;
case LTTNG_KERNEL_UPROBE:
- lttng_uprobes_unregister(event);
+ lttng_uprobes_unregister_event(event);
ret = 0;
break;
case LTTNG_KERNEL_FUNCTION: /* Fall-through */
return ret;
}
+/* Only used for tracepoints for now. */
+static
+void register_event_notifier(struct lttng_event_notifier *event_notifier)
+{
+ const struct lttng_event_desc *desc;
+ int ret = -EINVAL;
+
+ if (event_notifier->registered)
+ return;
+
+ desc = event_notifier->desc;
+ switch (event_notifier->instrumentation) {
+ case LTTNG_KERNEL_TRACEPOINT:
+ ret = lttng_wrapper_tracepoint_probe_register(desc->kname,
+ desc->event_notifier_callback,
+ event_notifier);
+ break;
+ case LTTNG_KERNEL_SYSCALL:
+ ret = lttng_syscall_filter_enable_event_notifier(event_notifier);
+ break;
+ case LTTNG_KERNEL_KPROBE:
+ case LTTNG_KERNEL_UPROBE:
+ ret = 0;
+ break;
+ case LTTNG_KERNEL_KRETPROBE:
+ case LTTNG_KERNEL_FUNCTION:
+ case LTTNG_KERNEL_NOOP:
+ default:
+ WARN_ON_ONCE(1);
+ }
+ if (!ret)
+ event_notifier->registered = 1;
+}
+
+static
+int _lttng_event_notifier_unregister(
+ struct lttng_event_notifier *event_notifier)
+{
+ const struct lttng_event_desc *desc;
+ int ret = -EINVAL;
+
+ if (!event_notifier->registered)
+ return 0;
+
+ desc = event_notifier->desc;
+ switch (event_notifier->instrumentation) {
+ case LTTNG_KERNEL_TRACEPOINT:
+ ret = lttng_wrapper_tracepoint_probe_unregister(event_notifier->desc->kname,
+ event_notifier->desc->event_notifier_callback,
+ event_notifier);
+ break;
+ case LTTNG_KERNEL_KPROBE:
+ lttng_kprobes_unregister_event_notifier(event_notifier);
+ ret = 0;
+ break;
+ case LTTNG_KERNEL_UPROBE:
+ lttng_uprobes_unregister_event_notifier(event_notifier);
+ ret = 0;
+ break;
+ case LTTNG_KERNEL_SYSCALL:
+ ret = lttng_syscall_filter_disable_event_notifier(event_notifier);
+ break;
+ case LTTNG_KERNEL_KRETPROBE:
+ case LTTNG_KERNEL_FUNCTION:
+ case LTTNG_KERNEL_NOOP:
+ default:
+ WARN_ON_ONCE(1);
+ }
+ if (!ret)
+ event_notifier->registered = 0;
+ return ret;
+}
+
/*
* Only used internally at session destruction.
*/
{
switch (event->instrumentation) {
case LTTNG_KERNEL_TRACEPOINT:
- lttng_event_put(event->desc);
+ lttng_event_desc_put(event->desc);
break;
case LTTNG_KERNEL_KPROBE:
module_put(event->desc->owner);
- lttng_kprobes_destroy_private(event);
+ lttng_kprobes_destroy_event_private(event);
break;
case LTTNG_KERNEL_KRETPROBE:
module_put(event->desc->owner);
break;
case LTTNG_KERNEL_UPROBE:
module_put(event->desc->owner);
- lttng_uprobes_destroy_private(event);
+ lttng_uprobes_destroy_event_private(event);
break;
case LTTNG_KERNEL_FUNCTION: /* Fall-through */
default:
kmem_cache_free(event_cache, event);
}
+/*
+ * Only used internally at session destruction.
+ */
+static
+void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier)
+{
+ switch (event_notifier->instrumentation) {
+ case LTTNG_KERNEL_TRACEPOINT:
+ lttng_event_desc_put(event_notifier->desc);
+ break;
+ case LTTNG_KERNEL_KPROBE:
+ module_put(event_notifier->desc->owner);
+ lttng_kprobes_destroy_event_notifier_private(event_notifier);
+ break;
+ case LTTNG_KERNEL_NOOP:
+ case LTTNG_KERNEL_SYSCALL:
+ break;
+ case LTTNG_KERNEL_UPROBE:
+ module_put(event_notifier->desc->owner);
+ lttng_uprobes_destroy_event_notifier_private(event_notifier);
+ break;
+ case LTTNG_KERNEL_KRETPROBE:
+ case LTTNG_KERNEL_FUNCTION:
+ default:
+ WARN_ON_ONCE(1);
+ }
+ list_del(&event_notifier->list);
+ kmem_cache_free(event_notifier_cache, event_notifier);
+}
+
struct lttng_id_tracker *get_tracker(struct lttng_session *session,
enum tracker_type tracker_type)
{
return 1;
}
-static
int lttng_desc_match_enabler(const struct lttng_event_desc *desc,
struct lttng_enabler *enabler)
{
return -EINVAL;
}
switch (enabler->event_param.u.syscall.match) {
- case LTTNG_SYSCALL_MATCH_NAME:
+ case LTTNG_KERNEL_SYSCALL_MATCH_NAME:
switch (enabler->format_type) {
case LTTNG_ENABLER_FORMAT_STAR_GLOB:
return lttng_match_enabler_star_glob(desc_name, enabler_name);
return -EINVAL;
}
break;
- case LTTNG_SYSCALL_MATCH_NR:
+ case LTTNG_KERNEL_SYSCALL_MATCH_NR:
return -EINVAL; /* Not implemented. */
default:
return -EINVAL;
return 0;
}
+static
+int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler,
+ struct lttng_event_notifier *event_notifier)
+{
+ struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(
+ event_notifier_enabler);
+
+ if (base_enabler->event_param.instrumentation != event_notifier->instrumentation)
+ return 0;
+ if (lttng_desc_match_enabler(event_notifier->desc, base_enabler)
+ && event_notifier->group == event_notifier_enabler->group
+ && event_notifier->user_token == event_notifier_enabler->base.user_token)
+ return 1;
+ else
+ return 0;
+}
+
static
struct lttng_enabler_ref *lttng_enabler_ref(
struct list_head *enablers_ref_list,
for (i = 0; i < probe_desc->nr_events; i++) {
int found = 0;
struct hlist_head *head;
- const char *event_name;
- size_t name_len;
- uint32_t hash;
struct lttng_event *event;
desc = probe_desc->event_desc[i];
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_EVENT_HT_SIZE - 1)];
+ head = utils_borrow_hash_table_bucket(
+ session->events_ht.table, LTTNG_EVENT_HT_SIZE,
+ desc->name);
lttng_hlist_for_each_entry(event, head, hlist) {
if (event->desc == desc
&& event->chan == event_enabler->chan)
}
}
+static
+void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
+{
+ struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group;
+ struct lttng_probe_desc *probe_desc;
+ const struct lttng_event_desc *desc;
+ int i;
+ struct list_head *probe_list;
+
+ probe_list = lttng_get_probe_list_head();
+ /*
+ * For each probe event, if we find that a probe event matches
+ * our enabler, create an associated lttng_event_notifier if not
+ * already present.
+ */
+ list_for_each_entry(probe_desc, probe_list, head) {
+ for (i = 0; i < probe_desc->nr_events; i++) {
+ int found = 0;
+ struct hlist_head *head;
+ struct lttng_event_notifier *event_notifier;
+
+ desc = probe_desc->event_desc[i];
+ if (!lttng_desc_match_enabler(desc,
+ lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)))
+ continue;
+
+ /*
+ * Check if already created.
+ */
+ head = utils_borrow_hash_table_bucket(
+ event_notifier_group->event_notifiers_ht.table,
+ LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->name);
+ lttng_hlist_for_each_entry(event_notifier, head, hlist) {
+ if (event_notifier->desc == desc
+ && event_notifier->user_token == event_notifier_enabler->base.user_token)
+ found = 1;
+ }
+ if (found)
+ continue;
+
+ /*
+ * We need to create a event_notifier for this event probe.
+ */
+ event_notifier = _lttng_event_notifier_create(desc,
+ event_notifier_enabler->base.user_token,
+ event_notifier_group, NULL, NULL,
+ LTTNG_KERNEL_TRACEPOINT);
+ if (IS_ERR(event_notifier)) {
+ printk(KERN_INFO "Unable to create event_notifier %s\n",
+ probe_desc->event_desc[i]->name);
+ }
+ }
+ }
+}
+
static
void lttng_create_syscall_event_if_missing(struct lttng_event_enabler *event_enabler)
{
int ret;
- ret = lttng_syscalls_register(event_enabler->chan, NULL);
+ ret = lttng_syscalls_register_event(event_enabler->chan, NULL);
+ WARN_ON_ONCE(ret);
+}
+
+static
+void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
+{
+ int ret;
+
+ ret = lttng_syscalls_register_event_notifier(event_notifier_enabler, NULL);
+ WARN_ON_ONCE(ret);
+ ret = lttng_syscals_create_matching_event_notifiers(event_notifier_enabler, NULL);
WARN_ON_ONCE(ret);
}
if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_SYSCALL &&
base_enabler->event_param.u.syscall.entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT &&
base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_SYSCALL_ABI_ALL &&
- base_enabler->event_param.u.syscall.match == LTTNG_SYSCALL_MATCH_NAME &&
+ base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_SYSCALL_MATCH_NAME &&
!strcmp(base_enabler->event_param.name, "*")) {
if (base_enabler->enabled)
WRITE_ONCE(chan->syscall_all, 1);
*/
lttng_enabler_link_bytecode(event->desc,
lttng_static_ctx,
- &event->bytecode_runtime_head,
- lttng_event_enabler_as_enabler(event_enabler));
+ &event->filter_bytecode_runtime_head,
+ <tng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head);
/* TODO: merge event context. */
}
return 0;
}
+/*
+ * Create struct lttng_event_notifier if it is missing and present in the list of
+ * tracepoint probes.
+ * Should be called with sessions mutex held.
+ */
+static
+void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
+{
+ switch (event_notifier_enabler->base.event_param.instrumentation) {
+ case LTTNG_KERNEL_TRACEPOINT:
+ lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler);
+ break;
+ case LTTNG_KERNEL_SYSCALL:
+ lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler);
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ break;
+ }
+}
+
+/*
+ * 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_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
+ struct lttng_event_notifier *event_notifier;
+
+ if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_SYSCALL &&
+ base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_SYSCALL_ABI_ALL &&
+ base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_SYSCALL_MATCH_NAME &&
+ !strcmp(base_enabler->event_param.name, "*")) {
+
+ int enabled = base_enabler->enabled;
+ enum lttng_kernel_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit;
+
+ if (entryexit == LTTNG_KERNEL_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT)
+ WRITE_ONCE(event_notifier_group->syscall_all_entry, enabled);
+
+ if (entryexit == LTTNG_KERNEL_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT)
+ WRITE_ONCE(event_notifier_group->syscall_all_exit, enabled);
+
+ }
+
+ /* 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. */
+ list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, list) {
+ struct lttng_enabler_ref *enabler_ref;
+
+ if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier))
+ continue;
+
+ enabler_ref = lttng_enabler_ref(&event_notifier->enablers_ref_head,
+ lttng_event_notifier_enabler_as_enabler(event_notifier_enabler));
+ if (!enabler_ref) {
+ /*
+ * If no backward ref, create it.
+ * Add backward ref from event_notifier to enabler.
+ */
+ enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
+ if (!enabler_ref)
+ return -ENOMEM;
+
+ enabler_ref->ref = lttng_event_notifier_enabler_as_enabler(
+ event_notifier_enabler);
+ list_add(&enabler_ref->node,
+ &event_notifier->enablers_ref_head);
+ }
+
+ /*
+ * Link filter bytecodes if not linked yet.
+ */
+ lttng_enabler_link_bytecode(event_notifier->desc,
+ lttng_static_ctx, &event_notifier->filter_bytecode_runtime_head,
+ <tng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head);
+
+ /* Link capture bytecodes if not linked yet. */
+ lttng_enabler_link_bytecode(event_notifier->desc,
+ lttng_static_ctx, &event_notifier->capture_bytecode_runtime_head,
+ &event_notifier_enabler->capture_bytecode_head);
+
+ event_notifier->num_captures = event_notifier_enabler->num_captures;
+ }
+ return 0;
+}
+
/*
* Called at module load: connect the probe on all enablers matching
* this event.
return 0;
}
+static bool lttng_event_notifier_group_has_active_event_notifiers(
+ struct lttng_event_notifier_group *event_notifier_group)
+{
+ struct lttng_event_notifier_enabler *event_notifier_enabler;
+
+ list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head,
+ node) {
+ if (event_notifier_enabler->base.enabled)
+ return true;
+ }
+ return false;
+}
+
+bool lttng_event_notifier_active(void)
+{
+ struct lttng_event_notifier_group *event_notifier_group;
+
+ list_for_each_entry(event_notifier_group, &event_notifier_groups, node) {
+ if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group))
+ return true;
+ }
+ return false;
+}
+
+int lttng_fix_pending_event_notifiers(void)
+{
+ struct lttng_event_notifier_group *event_notifier_group;
+
+ list_for_each_entry(event_notifier_group, &event_notifier_groups, node)
+ lttng_event_notifier_group_sync_enablers(event_notifier_group);
+ return 0;
+}
+
struct lttng_event_enabler *lttng_event_enabler_create(
enum lttng_enabler_format_type format_type,
struct lttng_kernel_event *event_param,
}
static
-int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler,
+int lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler,
struct lttng_kernel_filter_bytecode __user *bytecode)
{
- struct lttng_filter_bytecode_node *bytecode_node;
+ struct lttng_bytecode_node *bytecode_node;
uint32_t bytecode_len;
int ret;
ret = get_user(bytecode_len, &bytecode->len);
if (ret)
return ret;
- bytecode_node = kzalloc(sizeof(*bytecode_node) + bytecode_len,
+ bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
GFP_KERNEL);
if (!bytecode_node)
return -ENOMEM;
if (ret)
goto error_free;
+ bytecode_node->type = LTTNG_BYTECODE_NODE_TYPE_FILTER;
bytecode_node->enabler = enabler;
/* Enforce length based on allocated size */
bytecode_node->bc.len = bytecode_len;
return 0;
error_free:
- kfree(bytecode_node);
+ lttng_kvfree(bytecode_node);
return ret;
}
-int lttng_event_enabler_attach_bytecode(struct lttng_event_enabler *event_enabler,
+int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler,
struct lttng_kernel_filter_bytecode __user *bytecode)
{
int ret;
- ret = lttng_enabler_attach_bytecode(
+ ret = lttng_enabler_attach_filter_bytecode(
lttng_event_enabler_as_enabler(event_enabler), bytecode);
if (ret)
goto error;
switch (event->instrumentation) {
case LTTNG_KERNEL_UPROBE:
- return lttng_uprobes_add_callsite(event, callsite);
+ return lttng_uprobes_event_add_callsite(event, callsite);
default:
return -EINVAL;
}
static
void lttng_enabler_destroy(struct lttng_enabler *enabler)
{
- struct lttng_filter_bytecode_node *filter_node, *tmp_filter_node;
+ struct lttng_bytecode_node *filter_node, *tmp_filter_node;
/* Destroy filter bytecode */
list_for_each_entry_safe(filter_node, tmp_filter_node,
&enabler->filter_bytecode_head, node) {
- kfree(filter_node);
+ lttng_kvfree(filter_node);
}
}
kfree(event_enabler);
}
+struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create(
+ struct lttng_event_notifier_group *event_notifier_group,
+ enum lttng_enabler_format_type format_type,
+ struct lttng_kernel_event_notifier *event_notifier_param)
+{
+ struct lttng_event_notifier_enabler *event_notifier_enabler;
+
+ event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL);
+ if (!event_notifier_enabler)
+ return NULL;
+
+ event_notifier_enabler->base.format_type = format_type;
+ INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head);
+ INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head);
+
+ event_notifier_enabler->num_captures = 0;
+
+ memcpy(&event_notifier_enabler->base.event_param, &event_notifier_param->event,
+ sizeof(event_notifier_enabler->base.event_param));
+ event_notifier_enabler->base.evtype = LTTNG_TYPE_ENABLER;
+
+ event_notifier_enabler->base.enabled = 0;
+ event_notifier_enabler->base.user_token = event_notifier_param->event.token;
+ event_notifier_enabler->group = event_notifier_group;
+
+ mutex_lock(&sessions_mutex);
+ list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head);
+ lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
+
+ mutex_unlock(&sessions_mutex);
+
+ return event_notifier_enabler;
+}
+
+int lttng_event_notifier_enabler_enable(
+ struct lttng_event_notifier_enabler *event_notifier_enabler)
+{
+ mutex_lock(&sessions_mutex);
+ lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1;
+ lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
+ mutex_unlock(&sessions_mutex);
+ return 0;
+}
+
+int lttng_event_notifier_enabler_disable(
+ struct lttng_event_notifier_enabler *event_notifier_enabler)
+{
+ mutex_lock(&sessions_mutex);
+ lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0;
+ lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
+ mutex_unlock(&sessions_mutex);
+ return 0;
+}
+
+int lttng_event_notifier_enabler_attach_filter_bytecode(
+ struct lttng_event_notifier_enabler *event_notifier_enabler,
+ struct lttng_kernel_filter_bytecode __user *bytecode)
+{
+ int ret;
+
+ ret = lttng_enabler_attach_filter_bytecode(
+ lttng_event_notifier_enabler_as_enabler(event_notifier_enabler),
+ bytecode);
+ if (ret)
+ goto error;
+
+ lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
+ return 0;
+
+error:
+ return ret;
+}
+
+int lttng_event_notifier_enabler_attach_capture_bytecode(
+ struct lttng_event_notifier_enabler *event_notifier_enabler,
+ struct lttng_kernel_capture_bytecode __user *bytecode)
+{
+ struct lttng_bytecode_node *bytecode_node;
+ struct lttng_enabler *enabler =
+ lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
+ uint32_t bytecode_len;
+ int ret;
+
+ ret = get_user(bytecode_len, &bytecode->len);
+ if (ret)
+ return ret;
+
+ bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
+ GFP_KERNEL);
+ if (!bytecode_node)
+ return -ENOMEM;
+
+ ret = copy_from_user(&bytecode_node->bc, bytecode,
+ sizeof(*bytecode) + bytecode_len);
+ if (ret)
+ goto error_free;
+
+ bytecode_node->type = LTTNG_BYTECODE_NODE_TYPE_CAPTURE;
+ bytecode_node->enabler = enabler;
+
+ /* Enforce length based on allocated size */
+ bytecode_node->bc.len = bytecode_len;
+ list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head);
+
+ event_notifier_enabler->num_captures++;
+
+ lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
+ goto end;
+
+error_free:
+ lttng_kvfree(bytecode_node);
+end:
+ return ret;
+}
+
+int lttng_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier,
+ struct lttng_kernel_event_callsite __user *callsite)
+{
+
+ switch (event_notifier->instrumentation) {
+ case LTTNG_KERNEL_UPROBE:
+ return lttng_uprobes_event_notifier_add_callsite(event_notifier,
+ callsite);
+ default:
+ return -EINVAL;
+ }
+}
+
+int lttng_event_notifier_enabler_attach_context(
+ struct lttng_event_notifier_enabler *event_notifier_enabler,
+ struct lttng_kernel_context *context_param)
+{
+ return -ENOSYS;
+}
+
+static
+void lttng_event_notifier_enabler_destroy(
+ struct lttng_event_notifier_enabler *event_notifier_enabler)
+{
+ if (!event_notifier_enabler) {
+ return;
+ }
+
+ list_del(&event_notifier_enabler->node);
+
+ lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler));
+ kfree(event_notifier_enabler);
+}
+
/*
* lttng_session_sync_event_enablers should be called just before starting a
* session.
/* Enable filters */
list_for_each_entry(runtime,
- &event->bytecode_runtime_head, node)
- lttng_filter_sync_state(runtime);
+ &event->filter_bytecode_runtime_head, node)
+ lttng_bytecode_filter_sync_state(runtime);
}
}
lttng_session_sync_event_enablers(session);
}
+static
+void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group)
+{
+ struct lttng_event_notifier_enabler *event_notifier_enabler;
+ struct lttng_event_notifier *event_notifier;
+
+ 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.
+ */
+ list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, list) {
+ struct lttng_enabler_ref *enabler_ref;
+ struct lttng_bytecode_runtime *runtime;
+ int enabled = 0, has_enablers_without_bytecode = 0;
+
+ switch (event_notifier->instrumentation) {
+ case LTTNG_KERNEL_TRACEPOINT:
+ case LTTNG_KERNEL_SYSCALL:
+ /* Enable event_notifiers */
+ list_for_each_entry(enabler_ref,
+ &event_notifier->enablers_ref_head, node) {
+ if (enabler_ref->ref->enabled) {
+ enabled = 1;
+ break;
+ }
+ }
+ break;
+ default:
+ /* Not handled with sync. */
+ continue;
+ }
+
+ WRITE_ONCE(event_notifier->enabled, enabled);
+ /*
+ * Sync tracepoint registration with event_notifier enabled
+ * state.
+ */
+ if (enabled) {
+ if (!event_notifier->registered)
+ register_event_notifier(event_notifier);
+ } else {
+ if (event_notifier->registered)
+ _lttng_event_notifier_unregister(event_notifier);
+ }
+
+ /* Check if has enablers without bytecode enabled */
+ list_for_each_entry(enabler_ref,
+ &event_notifier->enablers_ref_head, node) {
+ if (enabler_ref->ref->enabled
+ && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
+ has_enablers_without_bytecode = 1;
+ break;
+ }
+ }
+ event_notifier->has_enablers_without_bytecode =
+ has_enablers_without_bytecode;
+
+ /* Enable filters */
+ list_for_each_entry(runtime,
+ &event_notifier->filter_bytecode_runtime_head, node)
+ lttng_bytecode_filter_sync_state(runtime);
+
+ /* Enable captures */
+ list_for_each_entry(runtime,
+ &event_notifier->capture_bytecode_runtime_head, node)
+ lttng_bytecode_capture_sync_state(runtime);
+ }
+}
+
/*
* Serialize at most one packet worth of metadata into a metadata
* channel.
event_cache = KMEM_CACHE(lttng_event, 0);
if (!event_cache) {
ret = -ENOMEM;
- goto error_kmem;
+ goto error_kmem_event;
+ }
+ event_notifier_cache = KMEM_CACHE(lttng_event_notifier, 0);
+ if (!event_notifier_cache) {
+ ret = -ENOMEM;
+ goto error_kmem_event_notifier;
}
ret = lttng_abi_init();
if (ret)
error_logger:
lttng_abi_exit();
error_abi:
+ kmem_cache_destroy(event_notifier_cache);
+error_kmem_event_notifier:
kmem_cache_destroy(event_cache);
-error_kmem:
+error_kmem_event:
lttng_tracepoint_exit();
error_tp:
lttng_context_exit();
list_for_each_entry_safe(session, tmpsession, &sessions, list)
lttng_session_destroy(session);
kmem_cache_destroy(event_cache);
+ kmem_cache_destroy(event_notifier_cache);
lttng_tracepoint_exit();
lttng_context_exit();
printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
projects / lttng-modules.git / blobdiff