-/*
+/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
+ *
* lttng-events.c
*
* Holds LTTng per-session event registry.
*
* Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; only
- * version 2.1 of the License.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
+/*
+ * This page_alloc.h wrapper needs to be included before gfpflags.h because it
+ * overrides a function with a define.
+ */
+#include "wrapper/page_alloc.h"
+
#include <linux/module.h>
-#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/utsname.h>
#include <linux/err.h>
-#include "wrapper/uuid.h"
-#include "wrapper/vmalloc.h" /* for wrapper_vmalloc_sync_all() */
-#include "wrapper/random.h"
-#include "wrapper/tracepoint.h"
-#include "lttng-kernel-version.h"
-#include "lttng-events.h"
-#include "lttng-tracer.h"
-#include "lttng-abi-old.h"
+#include <linux/seq_file.h>
+#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/uuid.h>
+#include <linux/dmi.h>
+
+#include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_all() */
+#include <wrapper/random.h>
+#include <wrapper/tracepoint.h>
+#include <wrapper/list.h>
+#include <wrapper/types.h>
+#include <lttng-kernel-version.h>
+#include <lttng-events.h>
+#include <lttng-tracer.h>
+#include <lttng-abi-old.h>
+#include <lttng-endian.h>
+#include <lttng-string-utils.h>
+#include <wrapper/ringbuffer/backend.h>
+#include <wrapper/ringbuffer/frontend.h>
#define METADATA_CACHE_DEFAULT_SIZE 4096
static DEFINE_MUTEX(sessions_mutex);
static struct kmem_cache *event_cache;
+static void lttng_session_lazy_sync_enablers(struct lttng_session *session);
+static void lttng_session_sync_enablers(struct lttng_session *session);
+static void lttng_enabler_destroy(struct lttng_enabler *enabler);
+
static void _lttng_event_destroy(struct lttng_event *event);
static void _lttng_channel_destroy(struct lttng_channel *chan);
static int _lttng_event_unregister(struct lttng_event *event);
int _lttng_session_metadata_statedump(struct lttng_session *session);
static
void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream);
+static
+int _lttng_field_statedump(struct lttng_session *session,
+ const struct lttng_event_field *field,
+ size_t nesting);
void synchronize_trace(void)
{
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0))
+ synchronize_rcu();
+#else
synchronize_sched();
+#endif
+
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0))
#ifdef CONFIG_PREEMPT_RT_FULL
synchronize_rcu();
#endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */
}
+void lttng_lock_sessions(void)
+{
+ mutex_lock(&sessions_mutex);
+}
+
+void lttng_unlock_sessions(void)
+{
+ mutex_unlock(&sessions_mutex);
+}
+
+/*
+ * Called with sessions lock held.
+ */
+int lttng_session_active(void)
+{
+ struct lttng_session *iter;
+
+ list_for_each_entry(iter, &sessions, list) {
+ if (iter->active)
+ return 1;
+ }
+ return 0;
+}
+
struct lttng_session *lttng_session_create(void)
{
struct lttng_session *session;
struct lttng_metadata_cache *metadata_cache;
+ int i;
mutex_lock(&sessions_mutex);
- session = kzalloc(sizeof(struct lttng_session), GFP_KERNEL);
+ session = lttng_kvzalloc(sizeof(struct lttng_session), GFP_KERNEL);
if (!session)
goto err;
INIT_LIST_HEAD(&session->chan);
GFP_KERNEL);
if (!metadata_cache)
goto err_free_session;
- metadata_cache->data = kzalloc(METADATA_CACHE_DEFAULT_SIZE,
- GFP_KERNEL);
+ metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE);
if (!metadata_cache->data)
goto err_free_cache;
metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE;
kref_init(&metadata_cache->refcount);
+ mutex_init(&metadata_cache->lock);
session->metadata_cache = metadata_cache;
INIT_LIST_HEAD(&metadata_cache->metadata_stream);
+ memcpy(&metadata_cache->uuid, &session->uuid,
+ sizeof(metadata_cache->uuid));
+ INIT_LIST_HEAD(&session->enablers_head);
+ for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++)
+ INIT_HLIST_HEAD(&session->events_ht.table[i]);
list_add(&session->list, &sessions);
mutex_unlock(&sessions_mutex);
return session;
err_free_cache:
kfree(metadata_cache);
err_free_session:
- kfree(session);
+ lttng_kvfree(session);
err:
mutex_unlock(&sessions_mutex);
return NULL;
{
struct lttng_metadata_cache *cache =
container_of(kref, struct lttng_metadata_cache, refcount);
- kfree(cache->data);
+ vfree(cache->data);
kfree(cache);
}
struct lttng_channel *chan, *tmpchan;
struct lttng_event *event, *tmpevent;
struct lttng_metadata_stream *metadata_stream;
+ struct lttng_enabler *enabler, *tmpenabler;
int ret;
mutex_lock(&sessions_mutex);
- ACCESS_ONCE(session->active) = 0;
+ WRITE_ONCE(session->active, 0);
list_for_each_entry(chan, &session->chan, list) {
ret = lttng_syscalls_unregister(chan);
WARN_ON(ret);
WARN_ON(ret);
}
synchronize_trace(); /* Wait for in-flight events to complete */
+ list_for_each_entry_safe(enabler, tmpenabler,
+ &session->enablers_head, node)
+ lttng_enabler_destroy(enabler);
list_for_each_entry_safe(event, tmpevent, &session->events, list)
_lttng_event_destroy(event);
list_for_each_entry_safe(chan, tmpchan, &session->chan, list) {
}
list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list)
_lttng_metadata_channel_hangup(metadata_stream);
+ if (session->pid_tracker)
+ lttng_pid_tracker_destroy(session->pid_tracker);
kref_put(&session->metadata_cache->refcount, metadata_cache_destroy);
list_del(&session->list);
mutex_unlock(&sessions_mutex);
- kfree(session);
+ lttng_kvfree(session);
+}
+
+int lttng_session_statedump(struct lttng_session *session)
+{
+ int ret;
+
+ mutex_lock(&sessions_mutex);
+ ret = lttng_statedump_start(session);
+ mutex_unlock(&sessions_mutex);
+ return ret;
}
int lttng_session_enable(struct lttng_session *session)
goto end;
}
+ /* Set transient enabler state to "enabled" */
+ session->tstate = 1;
+
+ /* We need to sync enablers with session before activation. */
+ lttng_session_sync_enablers(session);
+
/*
* Snapshot the number of events per channel to know the type of header
* we need to use.
chan->header_type = 2; /* large */
}
- ACCESS_ONCE(session->active) = 1;
- ACCESS_ONCE(session->been_active) = 1;
+ /* Clear each stream's quiescent state. */
+ list_for_each_entry(chan, &session->chan, list) {
+ if (chan->channel_type != METADATA_CHANNEL)
+ lib_ring_buffer_clear_quiescent_channel(chan->chan);
+ }
+
+ WRITE_ONCE(session->active, 1);
+ WRITE_ONCE(session->been_active, 1);
ret = _lttng_session_metadata_statedump(session);
if (ret) {
- ACCESS_ONCE(session->active) = 0;
+ WRITE_ONCE(session->active, 0);
goto end;
}
ret = lttng_statedump_start(session);
if (ret)
- ACCESS_ONCE(session->active) = 0;
+ WRITE_ONCE(session->active, 0);
end:
mutex_unlock(&sessions_mutex);
return ret;
int lttng_session_disable(struct lttng_session *session)
{
int ret = 0;
+ struct lttng_channel *chan;
+
+ mutex_lock(&sessions_mutex);
+ if (!session->active) {
+ ret = -EBUSY;
+ goto end;
+ }
+ WRITE_ONCE(session->active, 0);
+
+ /* Set transient enabler state to "disabled" */
+ session->tstate = 0;
+ lttng_session_sync_enablers(session);
+
+ /* Set each stream's quiescent state. */
+ list_for_each_entry(chan, &session->chan, list) {
+ if (chan->channel_type != METADATA_CHANNEL)
+ lib_ring_buffer_set_quiescent_channel(chan->chan);
+ }
+end:
+ mutex_unlock(&sessions_mutex);
+ return ret;
+}
+
+int lttng_session_metadata_regenerate(struct lttng_session *session)
+{
+ int ret = 0;
+ struct lttng_channel *chan;
+ struct lttng_event *event;
+ struct lttng_metadata_cache *cache = session->metadata_cache;
+ struct lttng_metadata_stream *stream;
mutex_lock(&sessions_mutex);
if (!session->active) {
ret = -EBUSY;
goto end;
}
- ACCESS_ONCE(session->active) = 0;
+
+ mutex_lock(&cache->lock);
+ memset(cache->data, 0, cache->cache_alloc);
+ cache->metadata_written = 0;
+ cache->version++;
+ list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) {
+ stream->metadata_out = 0;
+ stream->metadata_in = 0;
+ }
+ mutex_unlock(&cache->lock);
+
+ session->metadata_dumped = 0;
+ list_for_each_entry(chan, &session->chan, list) {
+ chan->metadata_dumped = 0;
+ }
+
+ list_for_each_entry(event, &session->events, list) {
+ event->metadata_dumped = 0;
+ }
+
+ ret = _lttng_session_metadata_statedump(session);
+
end:
mutex_unlock(&sessions_mutex);
return ret;
int lttng_channel_enable(struct lttng_channel *channel)
{
- int old;
+ int ret = 0;
- if (channel->channel_type == METADATA_CHANNEL)
- return -EPERM;
- old = xchg(&channel->enabled, 1);
- if (old)
- return -EEXIST;
- return 0;
+ mutex_lock(&sessions_mutex);
+ if (channel->channel_type == METADATA_CHANNEL) {
+ ret = -EPERM;
+ goto end;
+ }
+ if (channel->enabled) {
+ ret = -EEXIST;
+ goto end;
+ }
+ /* Set transient enabler state to "enabled" */
+ channel->tstate = 1;
+ lttng_session_sync_enablers(channel->session);
+ /* Set atomically the state to "enabled" */
+ WRITE_ONCE(channel->enabled, 1);
+end:
+ mutex_unlock(&sessions_mutex);
+ return ret;
}
int lttng_channel_disable(struct lttng_channel *channel)
{
- int old;
+ int ret = 0;
- if (channel->channel_type == METADATA_CHANNEL)
- return -EPERM;
- old = xchg(&channel->enabled, 0);
- if (!old)
- return -EEXIST;
- return 0;
+ mutex_lock(&sessions_mutex);
+ if (channel->channel_type == METADATA_CHANNEL) {
+ ret = -EPERM;
+ goto end;
+ }
+ if (!channel->enabled) {
+ ret = -EEXIST;
+ goto end;
+ }
+ /* Set atomically the state to "disabled" */
+ WRITE_ONCE(channel->enabled, 0);
+ /* Set transient enabler state to "enabled" */
+ channel->tstate = 0;
+ lttng_session_sync_enablers(channel->session);
+end:
+ mutex_unlock(&sessions_mutex);
+ return ret;
}
int lttng_event_enable(struct lttng_event *event)
{
- int old;
+ int ret = 0;
- if (event->chan->channel_type == METADATA_CHANNEL)
- return -EPERM;
- old = xchg(&event->enabled, 1);
- if (old)
- return -EEXIST;
- return 0;
+ mutex_lock(&sessions_mutex);
+ if (event->chan->channel_type == METADATA_CHANNEL) {
+ ret = -EPERM;
+ goto end;
+ }
+ if (event->enabled) {
+ ret = -EEXIST;
+ goto end;
+ }
+ switch (event->instrumentation) {
+ case LTTNG_KERNEL_TRACEPOINT:
+ case LTTNG_KERNEL_SYSCALL:
+ ret = -EINVAL;
+ break;
+ case LTTNG_KERNEL_KPROBE:
+ case LTTNG_KERNEL_FUNCTION:
+ case LTTNG_KERNEL_UPROBE:
+ case LTTNG_KERNEL_NOOP:
+ WRITE_ONCE(event->enabled, 1);
+ break;
+ case LTTNG_KERNEL_KRETPROBE:
+ ret = lttng_kretprobes_event_enable_state(event, 1);
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ ret = -EINVAL;
+ }
+end:
+ mutex_unlock(&sessions_mutex);
+ return ret;
}
int lttng_event_disable(struct lttng_event *event)
{
- int old;
+ int ret = 0;
- if (event->chan->channel_type == METADATA_CHANNEL)
- return -EPERM;
- old = xchg(&event->enabled, 0);
- if (!old)
- return -EEXIST;
- return 0;
+ mutex_lock(&sessions_mutex);
+ if (event->chan->channel_type == METADATA_CHANNEL) {
+ ret = -EPERM;
+ goto end;
+ }
+ if (!event->enabled) {
+ ret = -EEXIST;
+ goto end;
+ }
+ switch (event->instrumentation) {
+ case LTTNG_KERNEL_TRACEPOINT:
+ case LTTNG_KERNEL_SYSCALL:
+ ret = -EINVAL;
+ break;
+ case LTTNG_KERNEL_KPROBE:
+ case LTTNG_KERNEL_FUNCTION:
+ case LTTNG_KERNEL_UPROBE:
+ case LTTNG_KERNEL_NOOP:
+ WRITE_ONCE(event->enabled, 0);
+ break;
+ case LTTNG_KERNEL_KRETPROBE:
+ ret = lttng_kretprobes_event_enable_state(event, 0);
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ ret = -EINVAL;
+ }
+end:
+ mutex_unlock(&sessions_mutex);
+ return ret;
}
static struct lttng_transport *lttng_transport_find(const char *name)
switch_timer_interval, read_timer_interval);
if (!chan->chan)
goto create_error;
+ chan->tstate = 1;
chan->enabled = 1;
chan->transport = transport;
chan->channel_type = channel_type;
/*
* Supports event creation while tracing session is active.
+ * Needs to be called with sessions mutex held.
*/
-struct lttng_event *lttng_event_create(struct lttng_channel *chan,
- struct lttng_kernel_event *event_param,
- void *filter,
- const struct lttng_event_desc *internal_desc)
+struct lttng_event *_lttng_event_create(struct lttng_channel *chan,
+ struct lttng_kernel_event *event_param,
+ void *filter,
+ const struct lttng_event_desc *event_desc,
+ enum lttng_kernel_instrumentation itype)
{
+ struct lttng_session *session = chan->session;
struct lttng_event *event;
+ const char *event_name;
+ struct hlist_head *head;
+ size_t name_len;
+ uint32_t hash;
int ret;
- mutex_lock(&sessions_mutex);
if (chan->free_event_id == -1U) {
ret = -EMFILE;
goto full;
}
- /*
- * This is O(n^2) (for each event, the loop is called at event
- * creation). Might require a hash if we have lots of events.
- */
- list_for_each_entry(event, &chan->session->events, list) {
- if (!strcmp(event->desc->name, event_param->name)) {
+
+ switch (itype) {
+ case LTTNG_KERNEL_TRACEPOINT:
+ event_name = event_desc->name;
+ break;
+ case LTTNG_KERNEL_KPROBE:
+ case LTTNG_KERNEL_UPROBE:
+ case LTTNG_KERNEL_KRETPROBE:
+ case LTTNG_KERNEL_FUNCTION:
+ case LTTNG_KERNEL_NOOP:
+ case LTTNG_KERNEL_SYSCALL:
+ event_name = event_param->name;
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ 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)];
+ lttng_hlist_for_each_entry(event, head, hlist) {
+ WARN_ON_ONCE(!event->desc);
+ if (!strncmp(event->desc->name, event_name,
+ LTTNG_KERNEL_SYM_NAME_LEN - 1)
+ && chan == event->chan) {
ret = -EEXIST;
goto exist;
}
}
+
event = kmem_cache_zalloc(event_cache, GFP_KERNEL);
if (!event) {
ret = -ENOMEM;
event->chan = chan;
event->filter = filter;
event->id = chan->free_event_id++;
- event->enabled = 1;
- event->instrumentation = event_param->instrumentation;
- /* Populate lttng_event structure before tracepoint registration. */
- smp_wmb();
- switch (event_param->instrumentation) {
+ event->instrumentation = itype;
+ event->evtype = LTTNG_TYPE_EVENT;
+ INIT_LIST_HEAD(&event->bytecode_runtime_head);
+ INIT_LIST_HEAD(&event->enablers_ref_head);
+
+ switch (itype) {
case LTTNG_KERNEL_TRACEPOINT:
- event->desc = lttng_event_get(event_param->name);
+ /* Event will be enabled by enabler sync. */
+ event->enabled = 0;
+ event->registered = 0;
+ event->desc = lttng_event_get(event_name);
if (!event->desc) {
ret = -ENOENT;
goto register_error;
}
- ret = kabi_2635_tracepoint_probe_register(event->desc->kname,
- event->desc->probe_callback,
- event);
- if (ret) {
- ret = -EINVAL;
- goto register_error;
- }
+ /* Populate lttng_event structure before event registration. */
+ smp_wmb();
break;
case LTTNG_KERNEL_KPROBE:
- ret = lttng_kprobes_register(event_param->name,
+ /*
+ * Needs to be explicitly enabled after creation, since
+ * we may want to apply filters.
+ */
+ event->enabled = 0;
+ event->registered = 1;
+ /*
+ * Populate lttng_event structure before event
+ * registration.
+ */
+ smp_wmb();
+ ret = lttng_kprobes_register(event_name,
event_param->u.kprobe.symbol_name,
event_param->u.kprobe.offset,
event_param->u.kprobe.addr,
struct lttng_event *event_return;
/* kretprobe defines 2 events */
+ /*
+ * Needs to be explicitly enabled after creation, since
+ * we may want to apply filters.
+ */
+ event->enabled = 0;
+ event->registered = 1;
event_return =
kmem_cache_zalloc(event_cache, GFP_KERNEL);
if (!event_return) {
event_return->chan = chan;
event_return->filter = filter;
event_return->id = chan->free_event_id++;
- event_return->enabled = 1;
- event_return->instrumentation = event_param->instrumentation;
+ event_return->enabled = 0;
+ event_return->registered = 1;
+ event_return->instrumentation = itype;
/*
* Populate lttng_event structure before kretprobe registration.
*/
smp_wmb();
- ret = lttng_kretprobes_register(event_param->name,
+ ret = lttng_kretprobes_register(event_name,
event_param->u.kretprobe.symbol_name,
event_param->u.kretprobe.offset,
event_param->u.kretprobe.addr,
break;
}
case LTTNG_KERNEL_FUNCTION:
- ret = lttng_ftrace_register(event_param->name,
+ /*
+ * Needs to be explicitly enabled after creation, since
+ * we may want to apply filters.
+ */
+ event->enabled = 0;
+ event->registered = 1;
+ /*
+ * Populate lttng_event structure before event
+ * registration.
+ */
+ smp_wmb();
+ ret = lttng_ftrace_register(event_name,
event_param->u.ftrace.symbol_name,
event);
if (ret) {
WARN_ON_ONCE(!ret);
break;
case LTTNG_KERNEL_NOOP:
- event->desc = internal_desc;
+ case LTTNG_KERNEL_SYSCALL:
+ /*
+ * Needs to be explicitly enabled after creation, since
+ * we may want to apply filters.
+ */
+ event->enabled = 0;
+ event->registered = 0;
+ event->desc = event_desc;
if (!event->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->enabled = 0;
+ event->registered = 1;
+
+ /*
+ * Populate lttng_event structure before event
+ * registration.
+ */
+ smp_wmb();
+
+ ret = lttng_uprobes_register(event_param->name,
+ event_param->u.uprobe.fd,
+ event);
+ if (ret)
+ goto register_error;
+ ret = try_module_get(event->desc->owner);
+ WARN_ON_ONCE(!ret);
+ break;
default:
WARN_ON_ONCE(1);
ret = -EINVAL;
if (ret) {
goto statedump_error;
}
+ hlist_add_head(&event->hlist, head);
list_add(&event->list, &chan->session->events);
- mutex_unlock(&sessions_mutex);
return event;
statedump_error:
kmem_cache_free(event_cache, event);
cache_error:
exist:
+type_error:
full:
- mutex_unlock(&sessions_mutex);
return ERR_PTR(ret);
}
+struct lttng_event *lttng_event_create(struct lttng_channel *chan,
+ struct lttng_kernel_event *event_param,
+ void *filter,
+ const struct lttng_event_desc *event_desc,
+ enum lttng_kernel_instrumentation itype)
+{
+ struct lttng_event *event;
+
+ mutex_lock(&sessions_mutex);
+ event = _lttng_event_create(chan, event_param, filter, event_desc,
+ itype);
+ mutex_unlock(&sessions_mutex);
+ return event;
+}
+
+/* Only used for tracepoints for now. */
+static
+void register_event(struct lttng_event *event)
+{
+ const struct lttng_event_desc *desc;
+ int ret = -EINVAL;
+
+ if (event->registered)
+ return;
+
+ desc = event->desc;
+ switch (event->instrumentation) {
+ case LTTNG_KERNEL_TRACEPOINT:
+ ret = lttng_wrapper_tracepoint_probe_register(desc->kname,
+ desc->probe_callback,
+ event);
+ break;
+ case LTTNG_KERNEL_SYSCALL:
+ ret = lttng_syscall_filter_enable(event->chan,
+ desc->name);
+ break;
+ case LTTNG_KERNEL_KPROBE:
+ case LTTNG_KERNEL_UPROBE:
+ case LTTNG_KERNEL_KRETPROBE:
+ case LTTNG_KERNEL_FUNCTION:
+ case LTTNG_KERNEL_NOOP:
+ ret = 0;
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ }
+ if (!ret)
+ event->registered = 1;
+}
+
/*
* Only used internally at session destruction.
*/
int _lttng_event_unregister(struct lttng_event *event)
{
+ const struct lttng_event_desc *desc;
int ret = -EINVAL;
+ if (!event->registered)
+ return 0;
+
+ desc = event->desc;
switch (event->instrumentation) {
case LTTNG_KERNEL_TRACEPOINT:
- ret = kabi_2635_tracepoint_probe_unregister(event->desc->kname,
+ ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname,
event->desc->probe_callback,
event);
- if (ret)
- return ret;
break;
case LTTNG_KERNEL_KPROBE:
lttng_kprobes_unregister(event);
lttng_ftrace_unregister(event);
ret = 0;
break;
+ case LTTNG_KERNEL_SYSCALL:
+ ret = lttng_syscall_filter_disable(event->chan,
+ desc->name);
+ break;
case LTTNG_KERNEL_NOOP:
ret = 0;
break;
+ case LTTNG_KERNEL_UPROBE:
+ lttng_uprobes_unregister(event);
+ ret = 0;
+ break;
default:
WARN_ON_ONCE(1);
}
+ if (!ret)
+ event->registered = 0;
return ret;
}
lttng_ftrace_destroy_private(event);
break;
case LTTNG_KERNEL_NOOP:
+ case LTTNG_KERNEL_SYSCALL:
+ break;
+ case LTTNG_KERNEL_UPROBE:
+ module_put(event->desc->owner);
+ lttng_uprobes_destroy_private(event);
break;
default:
WARN_ON_ONCE(1);
kmem_cache_free(event_cache, event);
}
+int lttng_session_track_pid(struct lttng_session *session, int pid)
+{
+ int ret;
+
+ if (pid < -1)
+ return -EINVAL;
+ mutex_lock(&sessions_mutex);
+ if (pid == -1) {
+ /* track all pids: destroy tracker. */
+ if (session->pid_tracker) {
+ struct lttng_pid_tracker *lpf;
+
+ lpf = session->pid_tracker;
+ rcu_assign_pointer(session->pid_tracker, NULL);
+ synchronize_trace();
+ lttng_pid_tracker_destroy(lpf);
+ }
+ ret = 0;
+ } else {
+ if (!session->pid_tracker) {
+ struct lttng_pid_tracker *lpf;
+
+ lpf = lttng_pid_tracker_create();
+ if (!lpf) {
+ ret = -ENOMEM;
+ goto unlock;
+ }
+ ret = lttng_pid_tracker_add(lpf, pid);
+ rcu_assign_pointer(session->pid_tracker, lpf);
+ } else {
+ ret = lttng_pid_tracker_add(session->pid_tracker, pid);
+ }
+ }
+unlock:
+ mutex_unlock(&sessions_mutex);
+ return ret;
+}
+
+int lttng_session_untrack_pid(struct lttng_session *session, int pid)
+{
+ int ret;
+
+ if (pid < -1)
+ return -EINVAL;
+ mutex_lock(&sessions_mutex);
+ if (pid == -1) {
+ /* untrack all pids: replace by empty tracker. */
+ struct lttng_pid_tracker *old_lpf = session->pid_tracker;
+ struct lttng_pid_tracker *lpf;
+
+ lpf = lttng_pid_tracker_create();
+ if (!lpf) {
+ ret = -ENOMEM;
+ goto unlock;
+ }
+ rcu_assign_pointer(session->pid_tracker, lpf);
+ synchronize_trace();
+ if (old_lpf)
+ lttng_pid_tracker_destroy(old_lpf);
+ ret = 0;
+ } else {
+ if (!session->pid_tracker) {
+ ret = -ENOENT;
+ goto unlock;
+ }
+ ret = lttng_pid_tracker_del(session->pid_tracker, pid);
+ }
+unlock:
+ mutex_unlock(&sessions_mutex);
+ return ret;
+}
+
+static
+void *pid_list_start(struct seq_file *m, loff_t *pos)
+{
+ struct lttng_session *session = m->private;
+ struct lttng_pid_tracker *lpf;
+ struct lttng_pid_hash_node *e;
+ int iter = 0, i;
+
+ mutex_lock(&sessions_mutex);
+ lpf = session->pid_tracker;
+ if (lpf) {
+ for (i = 0; i < LTTNG_PID_TABLE_SIZE; i++) {
+ struct hlist_head *head = &lpf->pid_hash[i];
+
+ lttng_hlist_for_each_entry(e, head, hlist) {
+ if (iter++ >= *pos)
+ return e;
+ }
+ }
+ } else {
+ /* PID tracker disabled. */
+ if (iter >= *pos && iter == 0) {
+ return session; /* empty tracker */
+ }
+ iter++;
+ }
+ /* End of list */
+ return NULL;
+}
+
+/* Called with sessions_mutex held. */
+static
+void *pid_list_next(struct seq_file *m, void *p, loff_t *ppos)
+{
+ struct lttng_session *session = m->private;
+ struct lttng_pid_tracker *lpf;
+ struct lttng_pid_hash_node *e;
+ int iter = 0, i;
+
+ (*ppos)++;
+ lpf = session->pid_tracker;
+ if (lpf) {
+ for (i = 0; i < LTTNG_PID_TABLE_SIZE; i++) {
+ struct hlist_head *head = &lpf->pid_hash[i];
+
+ lttng_hlist_for_each_entry(e, head, hlist) {
+ if (iter++ >= *ppos)
+ return e;
+ }
+ }
+ } else {
+ /* PID tracker disabled. */
+ if (iter >= *ppos && iter == 0)
+ return session; /* empty tracker */
+ iter++;
+ }
+
+ /* End of list */
+ return NULL;
+}
+
+static
+void pid_list_stop(struct seq_file *m, void *p)
+{
+ mutex_unlock(&sessions_mutex);
+}
+
+static
+int pid_list_show(struct seq_file *m, void *p)
+{
+ int pid;
+
+ if (p == m->private) {
+ /* Tracker disabled. */
+ pid = -1;
+ } else {
+ const struct lttng_pid_hash_node *e = p;
+
+ pid = lttng_pid_tracker_get_node_pid(e);
+ }
+ seq_printf(m, "process { pid = %d; };\n", pid);
+ return 0;
+}
+
+static
+const struct seq_operations lttng_tracker_pids_list_seq_ops = {
+ .start = pid_list_start,
+ .next = pid_list_next,
+ .stop = pid_list_stop,
+ .show = pid_list_show,
+};
+
+static
+int lttng_tracker_pids_list_open(struct inode *inode, struct file *file)
+{
+ return seq_open(file, <tng_tracker_pids_list_seq_ops);
+}
+
+static
+int lttng_tracker_pids_list_release(struct inode *inode, struct file *file)
+{
+ struct seq_file *m = file->private_data;
+ struct lttng_session *session = m->private;
+ int ret;
+
+ WARN_ON_ONCE(!session);
+ ret = seq_release(inode, file);
+ if (!ret && session)
+ fput(session->file);
+ return ret;
+}
+
+const struct file_operations lttng_tracker_pids_list_fops = {
+ .owner = THIS_MODULE,
+ .open = lttng_tracker_pids_list_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = lttng_tracker_pids_list_release,
+};
+
+int lttng_session_list_tracker_pids(struct lttng_session *session)
+{
+ struct file *tracker_pids_list_file;
+ struct seq_file *m;
+ int file_fd, ret;
+
+ file_fd = lttng_get_unused_fd();
+ if (file_fd < 0) {
+ ret = file_fd;
+ goto fd_error;
+ }
+
+ tracker_pids_list_file = anon_inode_getfile("[lttng_tracker_pids_list]",
+ <tng_tracker_pids_list_fops,
+ NULL, O_RDWR);
+ if (IS_ERR(tracker_pids_list_file)) {
+ ret = PTR_ERR(tracker_pids_list_file);
+ goto file_error;
+ }
+ if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) {
+ ret = -EOVERFLOW;
+ goto refcount_error;
+ }
+ ret = lttng_tracker_pids_list_fops.open(NULL, tracker_pids_list_file);
+ if (ret < 0)
+ goto open_error;
+ m = tracker_pids_list_file->private_data;
+ m->private = session;
+ fd_install(file_fd, tracker_pids_list_file);
+
+ return file_fd;
+
+open_error:
+ atomic_long_dec(&session->file->f_count);
+refcount_error:
+ fput(tracker_pids_list_file);
+file_error:
+ put_unused_fd(file_fd);
+fd_error:
+ return ret;
+}
+
+/*
+ * Enabler management.
+ */
+static
+int lttng_match_enabler_star_glob(const char *desc_name,
+ const char *pattern)
+{
+ if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX,
+ desc_name, LTTNG_SIZE_MAX))
+ return 0;
+ return 1;
+}
+
+static
+int lttng_match_enabler_name(const char *desc_name,
+ const char *name)
+{
+ if (strcmp(desc_name, name))
+ return 0;
+ return 1;
+}
+
+static
+int lttng_desc_match_enabler(const struct lttng_event_desc *desc,
+ struct lttng_enabler *enabler)
+{
+ const char *desc_name, *enabler_name;
+
+ enabler_name = enabler->event_param.name;
+ switch (enabler->event_param.instrumentation) {
+ case LTTNG_KERNEL_TRACEPOINT:
+ desc_name = desc->name;
+ break;
+ case LTTNG_KERNEL_SYSCALL:
+ desc_name = desc->name;
+ if (!strncmp(desc_name, "compat_", strlen("compat_")))
+ desc_name += strlen("compat_");
+ if (!strncmp(desc_name, "syscall_exit_",
+ strlen("syscall_exit_"))) {
+ desc_name += strlen("syscall_exit_");
+ } else if (!strncmp(desc_name, "syscall_entry_",
+ strlen("syscall_entry_"))) {
+ desc_name += strlen("syscall_entry_");
+ } else {
+ WARN_ON_ONCE(1);
+ return -EINVAL;
+ }
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ return -EINVAL;
+ }
+ switch (enabler->type) {
+ case LTTNG_ENABLER_STAR_GLOB:
+ return lttng_match_enabler_star_glob(desc_name, enabler_name);
+ case LTTNG_ENABLER_NAME:
+ return lttng_match_enabler_name(desc_name, enabler_name);
+ default:
+ return -EINVAL;
+ }
+}
+
+static
+int lttng_event_match_enabler(struct lttng_event *event,
+ struct lttng_enabler *enabler)
+{
+ if (enabler->event_param.instrumentation != event->instrumentation)
+ return 0;
+ if (lttng_desc_match_enabler(event->desc, enabler)
+ && event->chan == enabler->chan)
+ return 1;
+ else
+ return 0;
+}
+
+static
+struct lttng_enabler_ref *lttng_event_enabler_ref(struct lttng_event *event,
+ struct lttng_enabler *enabler)
+{
+ struct lttng_enabler_ref *enabler_ref;
+
+ list_for_each_entry(enabler_ref,
+ &event->enablers_ref_head, node) {
+ if (enabler_ref->ref == enabler)
+ return enabler_ref;
+ }
+ return NULL;
+}
+
+static
+void lttng_create_tracepoint_if_missing(struct lttng_enabler *enabler)
+{
+ struct lttng_session *session = enabler->chan->session;
+ 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 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;
+ 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, 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)];
+ lttng_hlist_for_each_entry(event, head, hlist) {
+ if (event->desc == desc
+ && event->chan == enabler->chan)
+ found = 1;
+ }
+ if (found)
+ continue;
+
+ /*
+ * We need to create an event for this
+ * event probe.
+ */
+ event = _lttng_event_create(enabler->chan,
+ NULL, NULL, desc,
+ LTTNG_KERNEL_TRACEPOINT);
+ if (!event) {
+ printk(KERN_INFO "Unable to create event %s\n",
+ probe_desc->event_desc[i]->name);
+ }
+ }
+ }
+}
+
+static
+void lttng_create_syscall_if_missing(struct lttng_enabler *enabler)
+{
+ int ret;
+
+ ret = lttng_syscalls_register(enabler->chan, NULL);
+ WARN_ON_ONCE(ret);
+}
+
+/*
+ * Create struct lttng_event if it is missing and present in the list of
+ * tracepoint probes.
+ * Should be called with sessions mutex held.
+ */
+static
+void lttng_create_event_if_missing(struct lttng_enabler *enabler)
+{
+ switch (enabler->event_param.instrumentation) {
+ case LTTNG_KERNEL_TRACEPOINT:
+ lttng_create_tracepoint_if_missing(enabler);
+ break;
+ case LTTNG_KERNEL_SYSCALL:
+ lttng_create_syscall_if_missing(enabler);
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ break;
+ }
+}
+
+/*
+ * Create events associated with an enabler (if not already present),
+ * and add backward reference from the event to the enabler.
+ * Should be called with sessions mutex held.
+ */
+static
+int lttng_enabler_ref_events(struct lttng_enabler *enabler)
+{
+ struct lttng_session *session = enabler->chan->session;
+ struct lttng_event *event;
+
+ /* First ensure that probe events are created for this enabler. */
+ lttng_create_event_if_missing(enabler);
+
+ /* For each event matching enabler in session event list. */
+ list_for_each_entry(event, &session->events, list) {
+ struct lttng_enabler_ref *enabler_ref;
+
+ if (!lttng_event_match_enabler(event, enabler))
+ continue;
+ enabler_ref = lttng_event_enabler_ref(event, enabler);
+ if (!enabler_ref) {
+ /*
+ * If no backward ref, create it.
+ * Add backward ref from event to enabler.
+ */
+ enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
+ if (!enabler_ref)
+ return -ENOMEM;
+ enabler_ref->ref = enabler;
+ list_add(&enabler_ref->node,
+ &event->enablers_ref_head);
+ }
+
+ /*
+ * Link filter bytecodes if not linked yet.
+ */
+ lttng_enabler_event_link_bytecode(event, enabler);
+
+ /* TODO: merge event context. */
+ }
+ return 0;
+}
+
+/*
+ * Called at module load: connect the probe on all enablers matching
+ * this event.
+ * Called with sessions lock held.
+ */
+int lttng_fix_pending_events(void)
+{
+ struct lttng_session *session;
+
+ list_for_each_entry(session, &sessions, list)
+ lttng_session_lazy_sync_enablers(session);
+ return 0;
+}
+
+struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type,
+ struct lttng_kernel_event *event_param,
+ struct lttng_channel *chan)
+{
+ struct lttng_enabler *enabler;
+
+ enabler = kzalloc(sizeof(*enabler), GFP_KERNEL);
+ if (!enabler)
+ return NULL;
+ enabler->type = type;
+ INIT_LIST_HEAD(&enabler->filter_bytecode_head);
+ memcpy(&enabler->event_param, event_param,
+ sizeof(enabler->event_param));
+ enabler->chan = chan;
+ /* ctx left NULL */
+ enabler->enabled = 0;
+ enabler->evtype = LTTNG_TYPE_ENABLER;
+ mutex_lock(&sessions_mutex);
+ list_add(&enabler->node, &enabler->chan->session->enablers_head);
+ lttng_session_lazy_sync_enablers(enabler->chan->session);
+ mutex_unlock(&sessions_mutex);
+ return enabler;
+}
+
+int lttng_enabler_enable(struct lttng_enabler *enabler)
+{
+ mutex_lock(&sessions_mutex);
+ enabler->enabled = 1;
+ lttng_session_lazy_sync_enablers(enabler->chan->session);
+ mutex_unlock(&sessions_mutex);
+ return 0;
+}
+
+int lttng_enabler_disable(struct lttng_enabler *enabler)
+{
+ mutex_lock(&sessions_mutex);
+ enabler->enabled = 0;
+ lttng_session_lazy_sync_enablers(enabler->chan->session);
+ mutex_unlock(&sessions_mutex);
+ return 0;
+}
+
+int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler,
+ struct lttng_kernel_filter_bytecode __user *bytecode)
+{
+ struct lttng_filter_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,
+ 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->enabler = enabler;
+ /* Enforce length based on allocated size */
+ bytecode_node->bc.len = bytecode_len;
+ list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head);
+ lttng_session_lazy_sync_enablers(enabler->chan->session);
+ return 0;
+
+error_free:
+ kfree(bytecode_node);
+ return ret;
+}
+
+int lttng_event_add_callsite(struct lttng_event *event,
+ struct lttng_kernel_event_callsite __user *callsite)
+{
+
+ switch (event->instrumentation) {
+ case LTTNG_KERNEL_UPROBE:
+ return lttng_uprobes_add_callsite(event, callsite);
+ default:
+ return -EINVAL;
+ }
+}
+
+int lttng_enabler_attach_context(struct lttng_enabler *enabler,
+ struct lttng_kernel_context *context_param)
+{
+ return -ENOSYS;
+}
+
+static
+void lttng_enabler_destroy(struct lttng_enabler *enabler)
+{
+ struct lttng_filter_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);
+ }
+
+ /* Destroy contexts */
+ lttng_destroy_context(enabler->ctx);
+
+ list_del(&enabler->node);
+ kfree(enabler);
+}
+
+/*
+ * lttng_session_sync_enablers should be called just before starting a
+ * session.
+ * Should be called with sessions mutex held.
+ */
+static
+void lttng_session_sync_enablers(struct lttng_session *session)
+{
+ struct lttng_enabler *enabler;
+ struct lttng_event *event;
+
+ list_for_each_entry(enabler, &session->enablers_head, node)
+ lttng_enabler_ref_events(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.
+ */
+ list_for_each_entry(event, &session->events, list) {
+ struct lttng_enabler_ref *enabler_ref;
+ struct lttng_bytecode_runtime *runtime;
+ int enabled = 0, has_enablers_without_bytecode = 0;
+
+ switch (event->instrumentation) {
+ case LTTNG_KERNEL_TRACEPOINT:
+ case LTTNG_KERNEL_SYSCALL:
+ /* Enable events */
+ list_for_each_entry(enabler_ref,
+ &event->enablers_ref_head, node) {
+ if (enabler_ref->ref->enabled) {
+ enabled = 1;
+ break;
+ }
+ }
+ break;
+ default:
+ /* Not handled with lazy sync. */
+ continue;
+ }
+ /*
+ * Enabled state is based on union of enablers, with
+ * intesection of session and channel transient enable
+ * states.
+ */
+ enabled = enabled && session->tstate && event->chan->tstate;
+
+ WRITE_ONCE(event->enabled, enabled);
+ /*
+ * Sync tracepoint registration with event enabled
+ * state.
+ */
+ if (enabled) {
+ register_event(event);
+ } else {
+ _lttng_event_unregister(event);
+ }
+
+ /* Check if has enablers without bytecode enabled */
+ list_for_each_entry(enabler_ref,
+ &event->enablers_ref_head, node) {
+ if (enabler_ref->ref->enabled
+ && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
+ has_enablers_without_bytecode = 1;
+ break;
+ }
+ }
+ event->has_enablers_without_bytecode =
+ has_enablers_without_bytecode;
+
+ /* Enable filters */
+ list_for_each_entry(runtime,
+ &event->bytecode_runtime_head, node)
+ lttng_filter_sync_state(runtime);
+ }
+}
+
+/*
+ * Apply enablers to session events, adding events to session if need
+ * be. It is required after each modification applied to an active
+ * session, and right before session "start".
+ * "lazy" sync means we only sync if required.
+ * Should be called with sessions mutex held.
+ */
+static
+void lttng_session_lazy_sync_enablers(struct lttng_session *session)
+{
+ /* We can skip if session is not active */
+ if (!session->active)
+ return;
+ lttng_session_sync_enablers(session);
+}
+
+/*
+ * Serialize at most one packet worth of metadata into a metadata
+ * channel.
+ * We grab the metadata cache mutex to get exclusive access to our metadata
+ * buffer and to the metadata cache. Exclusive access to the metadata buffer
+ * allows us to do racy operations such as looking for remaining space left in
+ * packet and write, since mutual exclusion protects us from concurrent writes.
+ * Mutual exclusion on the metadata cache allow us to read the cache content
+ * without racing against reallocation of the cache by updates.
+ * Returns the number of bytes written in the channel, 0 if no data
+ * was written and a negative value on error.
+ */
+int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
+ struct channel *chan)
+{
+ struct lib_ring_buffer_ctx ctx;
+ int ret = 0;
+ size_t len, reserve_len;
+
+ /*
+ * Ensure we support mutiple get_next / put sequences followed by
+ * put_next. The metadata cache lock protects reading the metadata
+ * cache. It can indeed be read concurrently by "get_next_subbuf" and
+ * "flush" operations on the buffer invoked by different processes.
+ * Moreover, since the metadata cache memory can be reallocated, we
+ * need to have exclusive access against updates even though we only
+ * read it.
+ */
+ mutex_lock(&stream->metadata_cache->lock);
+ WARN_ON(stream->metadata_in < stream->metadata_out);
+ if (stream->metadata_in != stream->metadata_out)
+ goto end;
+
+ /* Metadata regenerated, change the version. */
+ if (stream->metadata_cache->version != stream->version)
+ stream->version = stream->metadata_cache->version;
+
+ len = stream->metadata_cache->metadata_written -
+ stream->metadata_in;
+ if (!len)
+ goto end;
+ reserve_len = min_t(size_t,
+ stream->transport->ops.packet_avail_size(chan),
+ len);
+ lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len,
+ sizeof(char), -1);
+ /*
+ * If reservation failed, return an error to the caller.
+ */
+ ret = stream->transport->ops.event_reserve(&ctx, 0);
+ if (ret != 0) {
+ printk(KERN_WARNING "LTTng: Metadata event reservation failed\n");
+ goto end;
+ }
+ stream->transport->ops.event_write(&ctx,
+ stream->metadata_cache->data + stream->metadata_in,
+ reserve_len);
+ stream->transport->ops.event_commit(&ctx);
+ stream->metadata_in += reserve_len;
+ ret = reserve_len;
+
+end:
+ mutex_unlock(&stream->metadata_cache->lock);
+ return ret;
+}
+
+/*
+ * Write the metadata to the metadata cache.
+ * Must be called with sessions_mutex held.
+ * The metadata cache lock protects us from concurrent read access from
+ * thread outputting metadata content to ring buffer.
+ */
+int lttng_metadata_printf(struct lttng_session *session,
+ const char *fmt, ...)
+{
+ char *str;
+ size_t len;
+ va_list ap;
+ struct lttng_metadata_stream *stream;
+
+ WARN_ON_ONCE(!READ_ONCE(session->active));
+
+ va_start(ap, fmt);
+ str = kvasprintf(GFP_KERNEL, fmt, ap);
+ va_end(ap);
+ if (!str)
+ return -ENOMEM;
+
+ len = strlen(str);
+ mutex_lock(&session->metadata_cache->lock);
+ if (session->metadata_cache->metadata_written + len >
+ session->metadata_cache->cache_alloc) {
+ char *tmp_cache_realloc;
+ unsigned int tmp_cache_alloc_size;
+
+ tmp_cache_alloc_size = max_t(unsigned int,
+ session->metadata_cache->cache_alloc + len,
+ session->metadata_cache->cache_alloc << 1);
+ tmp_cache_realloc = vzalloc(tmp_cache_alloc_size);
+ if (!tmp_cache_realloc)
+ goto err;
+ if (session->metadata_cache->data) {
+ memcpy(tmp_cache_realloc,
+ session->metadata_cache->data,
+ session->metadata_cache->cache_alloc);
+ vfree(session->metadata_cache->data);
+ }
+
+ session->metadata_cache->cache_alloc = tmp_cache_alloc_size;
+ session->metadata_cache->data = tmp_cache_realloc;
+ }
+ memcpy(session->metadata_cache->data +
+ session->metadata_cache->metadata_written,
+ str, len);
+ session->metadata_cache->metadata_written += len;
+ mutex_unlock(&session->metadata_cache->lock);
+ kfree(str);
+
+ list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list)
+ wake_up_interruptible(&stream->read_wait);
+
+ return 0;
+
+err:
+ mutex_unlock(&session->metadata_cache->lock);
+ kfree(str);
+ return -ENOMEM;
+}
+
+static
+int print_tabs(struct lttng_session *session, size_t nesting)
+{
+ size_t i;
+
+ for (i = 0; i < nesting; i++) {
+ int ret;
+
+ ret = lttng_metadata_printf(session, " ");
+ if (ret) {
+ return ret;
+ }
+ }
+ return 0;
+}
+
+/*
+ * Must be called with sessions_mutex held.
+ */
+static
+int _lttng_struct_type_statedump(struct lttng_session *session,
+ const struct lttng_type *type,
+ size_t nesting)
+{
+ int ret;
+ uint32_t i, nr_fields;
+
+ ret = print_tabs(session, nesting);
+ if (ret)
+ return ret;
+ ret = lttng_metadata_printf(session,
+ "struct {\n");
+ if (ret)
+ return ret;
+ nr_fields = type->u._struct.nr_fields;
+ for (i = 0; i < nr_fields; i++) {
+ const struct lttng_event_field *iter_field;
+
+ iter_field = &type->u._struct.fields[i];
+ ret = _lttng_field_statedump(session, iter_field, nesting + 1);
+ if (ret)
+ return ret;
+ }
+ ret = print_tabs(session, nesting);
+ if (ret)
+ return ret;
+ ret = lttng_metadata_printf(session,
+ "}");
+ return ret;
+}
+
+/*
+ * Must be called with sessions_mutex held.
+ */
+static
+int _lttng_struct_statedump(struct lttng_session *session,
+ const struct lttng_event_field *field,
+ size_t nesting)
+{
+ int ret;
+
+ ret = _lttng_struct_type_statedump(session,
+ &field->type, nesting);
+ if (ret)
+ return ret;
+ ret = lttng_metadata_printf(session,
+ "_%s;\n",
+ field->name);
+ return ret;
+}
+
+/*
+ * Must be called with sessions_mutex held.
+ */
+static
+int _lttng_variant_type_statedump(struct lttng_session *session,
+ const struct lttng_type *type,
+ size_t nesting)
+{
+ int ret;
+ uint32_t i, nr_choices;
+
+ ret = print_tabs(session, nesting);
+ if (ret)
+ return ret;
+ ret = lttng_metadata_printf(session,
+ "variant <_%s> {\n",
+ type->u.variant.tag_name);
+ if (ret)
+ return ret;
+ nr_choices = type->u.variant.nr_choices;
+ for (i = 0; i < nr_choices; i++) {
+ const struct lttng_event_field *iter_field;
+
+ iter_field = &type->u.variant.choices[i];
+ ret = _lttng_field_statedump(session, iter_field, nesting + 1);
+ if (ret)
+ return ret;
+ }
+ ret = print_tabs(session, nesting);
+ if (ret)
+ return ret;
+ ret = lttng_metadata_printf(session,
+ "}");
+ return ret;
+}
+
+/*
+ * Must be called with sessions_mutex held.
+ */
+static
+int _lttng_variant_statedump(struct lttng_session *session,
+ const struct lttng_event_field *field,
+ size_t nesting)
+{
+ int ret;
+
+ ret = _lttng_variant_type_statedump(session,
+ &field->type, nesting);
+ if (ret)
+ return ret;
+ ret = lttng_metadata_printf(session,
+ "_%s;\n",
+ field->name);
+ return ret;
+}
+
+/*
+ * Must be called with sessions_mutex held.
+ */
+static
+int _lttng_array_compound_statedump(struct lttng_session *session,
+ const struct lttng_event_field *field,
+ size_t nesting)
+{
+ int ret;
+ const struct lttng_type *elem_type;
+
+ /* Only array of structures and variants are currently supported. */
+ elem_type = field->type.u.array_compound.elem_type;
+ switch (elem_type->atype) {
+ case atype_struct:
+ ret = _lttng_struct_type_statedump(session, elem_type, nesting);
+ if (ret)
+ return ret;
+ break;
+ case atype_variant:
+ ret = _lttng_variant_type_statedump(session, elem_type, nesting);
+ if (ret)
+ return ret;
+ break;
+ default:
+ return -EINVAL;
+ }
+ ret = lttng_metadata_printf(session,
+ " _%s[%u];\n",
+ field->name,
+ field->type.u.array_compound.length);
+ return ret;
+}
+
/*
- * Serialize at most one packet worth of metadata into a metadata
- * channel.
- * We have exclusive access to our metadata buffer (protected by the
- * sessions_mutex), so we can do racy operations such as looking for
- * remaining space left in packet and write, since mutual exclusion
- * protects us from concurrent writes.
- * Returns the number of bytes written in the channel, 0 if no data
- * was written and a negative value on error.
+ * Must be called with sessions_mutex held.
*/
-int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
- struct channel *chan)
+static
+int _lttng_sequence_compound_statedump(struct lttng_session *session,
+ const struct lttng_event_field *field,
+ size_t nesting)
{
- struct lib_ring_buffer_ctx ctx;
- int ret = 0;
- size_t len, reserve_len;
+ int ret;
+ const char *length_name;
+ const struct lttng_type *elem_type;
- /*
- * Ensure we support mutiple get_next / put sequences followed
- * by put_next.
- */
- WARN_ON(stream->metadata_in < stream->metadata_out);
- if (stream->metadata_in != stream->metadata_out)
- return 0;
+ length_name = field->type.u.sequence_compound.length_name;
- len = stream->metadata_cache->metadata_written -
- stream->metadata_in;
- if (!len)
- return 0;
- reserve_len = min_t(size_t,
- stream->transport->ops.packet_avail_size(chan),
- len);
- lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len,
- sizeof(char), -1);
- /*
- * If reservation failed, return an error to the caller.
- */
- ret = stream->transport->ops.event_reserve(&ctx, 0);
- if (ret != 0) {
- printk(KERN_WARNING "LTTng: Metadata event reservation failed\n");
- goto end;
+ /* Only array of structures and variants are currently supported. */
+ elem_type = field->type.u.sequence_compound.elem_type;
+ switch (elem_type->atype) {
+ case atype_struct:
+ ret = _lttng_struct_type_statedump(session, elem_type, nesting);
+ if (ret)
+ return ret;
+ break;
+ case atype_variant:
+ ret = _lttng_variant_type_statedump(session, elem_type, nesting);
+ if (ret)
+ return ret;
+ break;
+ default:
+ return -EINVAL;
}
- stream->transport->ops.event_write(&ctx,
- stream->metadata_cache->data + stream->metadata_in,
- reserve_len);
- stream->transport->ops.event_commit(&ctx);
- stream->metadata_in += reserve_len;
- ret = reserve_len;
-
-end:
+ ret = lttng_metadata_printf(session,
+ " _%s[ _%s ];\n",
+ field->name,
+ length_name);
return ret;
}
/*
- * Write the metadata to the metadata cache.
* Must be called with sessions_mutex held.
*/
-int lttng_metadata_printf(struct lttng_session *session,
- const char *fmt, ...)
+static
+int _lttng_enum_statedump(struct lttng_session *session,
+ const struct lttng_event_field *field,
+ size_t nesting)
{
- char *str;
- size_t len;
- va_list ap;
- struct lttng_metadata_stream *stream;
+ const struct lttng_enum_desc *enum_desc;
+ const struct lttng_integer_type *container_type;
+ int ret;
+ unsigned int i, nr_entries;
- WARN_ON_ONCE(!ACCESS_ONCE(session->active));
+ enum_desc = field->type.u.basic.enumeration.desc;
+ container_type = &field->type.u.basic.enumeration.container_type;
+ nr_entries = enum_desc->nr_entries;
- va_start(ap, fmt);
- str = kvasprintf(GFP_KERNEL, fmt, ap);
- va_end(ap);
- if (!str)
- return -ENOMEM;
+ ret = print_tabs(session, nesting);
+ if (ret)
+ goto end;
+ ret = lttng_metadata_printf(session,
+ "enum : integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } {\n",
+ container_type->size,
+ container_type->alignment,
+ container_type->signedness,
+ (container_type->encoding == lttng_encode_none)
+ ? "none"
+ : (container_type->encoding == lttng_encode_UTF8)
+ ? "UTF8"
+ : "ASCII",
+ container_type->base,
+#if __BYTE_ORDER == __BIG_ENDIAN
+ container_type->reverse_byte_order ? " byte_order = le;" : ""
+#else
+ container_type->reverse_byte_order ? " byte_order = be;" : ""
+#endif
+ );
+ if (ret)
+ goto end;
+ /* Dump all entries */
+ for (i = 0; i < nr_entries; i++) {
+ const struct lttng_enum_entry *entry = &enum_desc->entries[i];
+ int j, len;
- len = strlen(str);
- if (session->metadata_cache->metadata_written + len >
- session->metadata_cache->cache_alloc) {
- char *tmp_cache_realloc;
- unsigned int tmp_cache_alloc_size;
+ ret = print_tabs(session, nesting + 1);
+ if (ret)
+ goto end;
+ ret = lttng_metadata_printf(session,
+ "\"");
+ if (ret)
+ goto end;
+ len = strlen(entry->string);
+ /* Escape the character '"' */
+ for (j = 0; j < len; j++) {
+ char c = entry->string[j];
+
+ switch (c) {
+ case '"':
+ ret = lttng_metadata_printf(session,
+ "\\\"");
+ break;
+ case '\\':
+ ret = lttng_metadata_printf(session,
+ "\\\\");
+ break;
+ default:
+ ret = lttng_metadata_printf(session,
+ "%c", c);
+ break;
+ }
+ if (ret)
+ goto end;
+ }
+ ret = lttng_metadata_printf(session, "\"");
+ if (ret)
+ goto end;
- tmp_cache_alloc_size = max_t(unsigned int,
- session->metadata_cache->cache_alloc + len,
- session->metadata_cache->cache_alloc << 1);
- tmp_cache_realloc = krealloc(session->metadata_cache->data,
- tmp_cache_alloc_size, GFP_KERNEL);
- if (!tmp_cache_realloc)
- goto err;
- session->metadata_cache->cache_alloc = tmp_cache_alloc_size;
- session->metadata_cache->data = tmp_cache_realloc;
+ if (entry->options.is_auto) {
+ ret = lttng_metadata_printf(session, ",\n");
+ if (ret)
+ goto end;
+ } else {
+ ret = lttng_metadata_printf(session,
+ " = ");
+ if (ret)
+ goto end;
+ if (entry->start.signedness)
+ ret = lttng_metadata_printf(session,
+ "%lld", (long long) entry->start.value);
+ else
+ ret = lttng_metadata_printf(session,
+ "%llu", entry->start.value);
+ if (ret)
+ goto end;
+ if (entry->start.signedness == entry->end.signedness &&
+ entry->start.value
+ == entry->end.value) {
+ ret = lttng_metadata_printf(session,
+ ",\n");
+ } else {
+ if (entry->end.signedness) {
+ ret = lttng_metadata_printf(session,
+ " ... %lld,\n",
+ (long long) entry->end.value);
+ } else {
+ ret = lttng_metadata_printf(session,
+ " ... %llu,\n",
+ entry->end.value);
+ }
+ }
+ if (ret)
+ goto end;
+ }
}
- memcpy(session->metadata_cache->data +
- session->metadata_cache->metadata_written,
- str, len);
- session->metadata_cache->metadata_written += len;
- kfree(str);
-
- list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list)
- wake_up_interruptible(&stream->read_wait);
-
- return 0;
-
-err:
- kfree(str);
- return -ENOMEM;
+ ret = print_tabs(session, nesting);
+ if (ret)
+ goto end;
+ ret = lttng_metadata_printf(session, "} _%s;\n",
+ field->name);
+end:
+ return ret;
}
/*
*/
static
int _lttng_field_statedump(struct lttng_session *session,
- const struct lttng_event_field *field)
+ const struct lttng_event_field *field,
+ size_t nesting)
{
int ret = 0;
switch (field->type.atype) {
case atype_integer:
+ ret = print_tabs(session, nesting);
+ if (ret)
+ return ret;
ret = lttng_metadata_printf(session,
- " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n",
+ "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n",
field->type.u.basic.integer.size,
field->type.u.basic.integer.alignment,
field->type.u.basic.integer.signedness,
? "UTF8"
: "ASCII",
field->type.u.basic.integer.base,
-#ifdef __BIG_ENDIAN
+#if __BYTE_ORDER == __BIG_ENDIAN
field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "",
#else
field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "",
field->name);
break;
case atype_enum:
- ret = lttng_metadata_printf(session,
- " %s _%s;\n",
- field->type.u.basic.enumeration.name,
- field->name);
+ ret = _lttng_enum_statedump(session, field, nesting);
break;
case atype_array:
+ case atype_array_bitfield:
{
const struct lttng_basic_type *elem_type;
elem_type = &field->type.u.array.elem_type;
+ if (field->type.u.array.elem_alignment) {
+ ret = print_tabs(session, nesting);
+ if (ret)
+ return ret;
+ ret = lttng_metadata_printf(session,
+ "struct { } align(%u) _%s_padding;\n",
+ field->type.u.array.elem_alignment * CHAR_BIT,
+ field->name);
+ if (ret)
+ return ret;
+ }
+ ret = print_tabs(session, nesting);
+ if (ret)
+ return ret;
ret = lttng_metadata_printf(session,
- " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n",
+ "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n",
elem_type->u.basic.integer.size,
elem_type->u.basic.integer.alignment,
elem_type->u.basic.integer.signedness,
? "UTF8"
: "ASCII",
elem_type->u.basic.integer.base,
-#ifdef __BIG_ENDIAN
+#if __BYTE_ORDER == __BIG_ENDIAN
elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "",
#else
elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "",
break;
}
case atype_sequence:
+ case atype_sequence_bitfield:
{
const struct lttng_basic_type *elem_type;
const struct lttng_basic_type *length_type;
elem_type = &field->type.u.sequence.elem_type;
length_type = &field->type.u.sequence.length_type;
+ ret = print_tabs(session, nesting);
+ if (ret)
+ return ret;
ret = lttng_metadata_printf(session,
- " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n",
+ "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n",
length_type->u.basic.integer.size,
(unsigned int) length_type->u.basic.integer.alignment,
length_type->u.basic.integer.signedness,
? "UTF8"
: "ASCII"),
length_type->u.basic.integer.base,
-#ifdef __BIG_ENDIAN
+#if __BYTE_ORDER == __BIG_ENDIAN
length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "",
#else
length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "",
if (ret)
return ret;
+ if (field->type.u.sequence.elem_alignment) {
+ ret = print_tabs(session, nesting);
+ if (ret)
+ return ret;
+ ret = lttng_metadata_printf(session,
+ "struct { } align(%u) _%s_padding;\n",
+ field->type.u.sequence.elem_alignment * CHAR_BIT,
+ field->name);
+ if (ret)
+ return ret;
+ }
+ ret = print_tabs(session, nesting);
+ if (ret)
+ return ret;
ret = lttng_metadata_printf(session,
- " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n",
+ "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n",
elem_type->u.basic.integer.size,
(unsigned int) elem_type->u.basic.integer.alignment,
elem_type->u.basic.integer.signedness,
? "UTF8"
: "ASCII"),
elem_type->u.basic.integer.base,
-#ifdef __BIG_ENDIAN
+#if __BYTE_ORDER == __BIG_ENDIAN
elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "",
#else
elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "",
case atype_string:
/* Default encoding is UTF8 */
+ ret = print_tabs(session, nesting);
+ if (ret)
+ return ret;
ret = lttng_metadata_printf(session,
- " string%s _%s;\n",
+ "string%s _%s;\n",
field->type.u.basic.string.encoding == lttng_encode_ASCII ?
" { encoding = ASCII; }" : "",
field->name);
break;
+ case atype_struct:
+ ret = _lttng_struct_statedump(session, field, nesting);
+ break;
+ case atype_array_compound:
+ ret = _lttng_array_compound_statedump(session, field, nesting);
+ break;
+ case atype_sequence_compound:
+ ret = _lttng_sequence_compound_statedump(session, field, nesting);
+ break;
+ case atype_variant:
+ ret = _lttng_variant_statedump(session, field, nesting);
+ break;
+
default:
WARN_ON_ONCE(1);
return -EINVAL;
for (i = 0; i < ctx->nr_fields; i++) {
const struct lttng_ctx_field *field = &ctx->fields[i];
- ret = _lttng_field_statedump(session, &field->event_field);
+ ret = _lttng_field_statedump(session, &field->event_field, 2);
if (ret)
return ret;
}
for (i = 0; i < desc->nr_fields; i++) {
const struct lttng_event_field *field = &desc->fields[i];
- ret = _lttng_field_statedump(session, field);
+ ret = _lttng_field_statedump(session, field, 2);
if (ret)
return ret;
}
{
int ret = 0;
- if (event->metadata_dumped || !ACCESS_ONCE(session->active))
+ if (event->metadata_dumped || !READ_ONCE(session->active))
return 0;
if (chan->channel_type == METADATA_CHANNEL)
return 0;
{
int ret = 0;
- if (chan->metadata_dumped || !ACCESS_ONCE(session->active))
+ if (chan->metadata_dumped || !READ_ONCE(session->active))
return 0;
if (chan->channel_type == METADATA_CHANNEL)
" uint64_clock_monotonic_t timestamp_end;\n"
" uint64_t content_size;\n"
" uint64_t packet_size;\n"
+ " uint64_t packet_seq_num;\n"
" unsigned long events_discarded;\n"
" uint32_t cpu_id;\n"
"};\n\n"
* taken at start of trace.
* Yes, this is only an approximation. Yes, we can (and will) do better
* in future versions.
+ * This function may return a negative offset. It may happen if the
+ * system sets the REALTIME clock to 0 after boot.
*/
static
-uint64_t measure_clock_offset(void)
+int64_t measure_clock_offset(void)
{
- uint64_t offset, monotonic[2], realtime;
+ uint64_t monotonic_avg, monotonic[2], realtime;
+ uint64_t tcf = trace_clock_freq();
+ int64_t offset;
struct timespec rts = { 0, 0 };
unsigned long flags;
/* Disable interrupts to increase correlation precision. */
local_irq_save(flags);
monotonic[0] = trace_clock_read64();
- getnstimeofday(&rts);
+ getnstimeofday(&rts);
monotonic[1] = trace_clock_read64();
local_irq_restore(flags);
- offset = (monotonic[0] + monotonic[1]) >> 1;
- realtime = (uint64_t) rts.tv_sec * NSEC_PER_SEC;
- realtime += rts.tv_nsec;
- offset = realtime - offset;
+ monotonic_avg = (monotonic[0] + monotonic[1]) >> 1;
+ realtime = (uint64_t) rts.tv_sec * tcf;
+ if (tcf == NSEC_PER_SEC) {
+ realtime += rts.tv_nsec;
+ } else {
+ uint64_t n = rts.tv_nsec * tcf;
+
+ do_div(n, NSEC_PER_SEC);
+ realtime += n;
+ }
+ offset = (int64_t) realtime - monotonic_avg;
return offset;
}
+static
+int print_escaped_ctf_string(struct lttng_session *session, const char *string)
+{
+ int ret;
+ size_t i;
+ char cur;
+
+ i = 0;
+ cur = string[i];
+ while (cur != '\0') {
+ switch (cur) {
+ case '\n':
+ ret = lttng_metadata_printf(session, "%s", "\\n");
+ break;
+ case '\\':
+ case '"':
+ ret = lttng_metadata_printf(session, "%c", '\\');
+ if (ret)
+ goto error;
+ /* We still print the current char */
+ /* Fallthrough */
+ default:
+ ret = lttng_metadata_printf(session, "%c", cur);
+ break;
+ }
+
+ if (ret)
+ goto error;
+
+ cur = string[++i];
+ }
+error:
+ return ret;
+}
+
+static
+int print_metadata_escaped_field(struct lttng_session *session, const char *field,
+ const char *field_value)
+{
+ int ret;
+
+ ret = lttng_metadata_printf(session, " %s = \"", field);
+ if (ret)
+ goto error;
+
+ ret = print_escaped_ctf_string(session, field_value);
+ if (ret)
+ goto error;
+
+ ret = lttng_metadata_printf(session, "\";\n");
+
+error:
+ return ret;
+}
+
/*
* Output metadata into this session's metadata buffers.
* Must be called with sessions_mutex held.
{
unsigned char *uuid_c = session->uuid.b;
unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN];
+ const char *product_uuid;
struct lttng_channel *chan;
struct lttng_event *event;
int ret = 0;
- if (!ACCESS_ONCE(session->active))
+ if (!READ_ONCE(session->active))
return 0;
if (session->metadata_dumped)
goto skip_session;
" uint32_t magic;\n"
" uint8_t uuid[16];\n"
" uint32_t stream_id;\n"
+ " uint64_t stream_instance_id;\n"
" };\n"
"};\n\n",
lttng_alignof(uint8_t) * CHAR_BIT,
CTF_SPEC_MAJOR,
CTF_SPEC_MINOR,
uuid_s,
-#ifdef __BIG_ENDIAN
+#if __BYTE_ORDER == __BIG_ENDIAN
"be"
#else
"le"
" tracer_major = %d;\n"
" tracer_minor = %d;\n"
" tracer_patchlevel = %d;\n"
- "};\n\n",
+ " trace_buffering_scheme = \"global\";\n",
current->nsproxy->uts_ns->name.nodename,
utsname()->sysname,
utsname()->release,
if (ret)
goto end;
+ ret = print_metadata_escaped_field(session, "trace_name", session->name);
+ if (ret)
+ goto end;
+ ret = print_metadata_escaped_field(session, "trace_creation_datetime",
+ session->creation_time);
+ if (ret)
+ goto end;
+
+ /* Add the product UUID to the 'env' section */
+ product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID);
+ if (product_uuid) {
+ ret = lttng_metadata_printf(session,
+ " product_uuid = \"%s\";\n",
+ product_uuid
+ );
+ if (ret)
+ goto end;
+ }
+
+ /* Close the 'env' section */
+ ret = lttng_metadata_printf(session, "};\n\n");
+ if (ret)
+ goto end;
+
ret = lttng_metadata_printf(session,
"clock {\n"
- " name = %s;\n",
- "monotonic"
+ " name = \"%s\";\n",
+ trace_clock_name()
);
if (ret)
goto end;
}
ret = lttng_metadata_printf(session,
- " description = \"Monotonic Clock\";\n"
+ " description = \"%s\";\n"
" freq = %llu; /* Frequency, in Hz */\n"
" /* clock value offset from Epoch is: offset * (1/freq) */\n"
- " offset = %llu;\n"
+ " offset = %lld;\n"
"};\n\n",
+ trace_clock_description(),
(unsigned long long) trace_clock_freq(),
- (unsigned long long) measure_clock_offset()
+ (long long) measure_clock_offset()
);
if (ret)
goto end;
ret = lttng_metadata_printf(session,
"typealias integer {\n"
" size = 27; align = 1; signed = false;\n"
- " map = clock.monotonic.value;\n"
+ " map = clock.%s.value;\n"
"} := uint27_clock_monotonic_t;\n"
"\n"
"typealias integer {\n"
" size = 32; align = %u; signed = false;\n"
- " map = clock.monotonic.value;\n"
+ " map = clock.%s.value;\n"
"} := uint32_clock_monotonic_t;\n"
"\n"
"typealias integer {\n"
" size = 64; align = %u; signed = false;\n"
- " map = clock.monotonic.value;\n"
+ " map = clock.%s.value;\n"
"} := uint64_clock_monotonic_t;\n\n",
+ trace_clock_name(),
lttng_alignof(uint32_t) * CHAR_BIT,
- lttng_alignof(uint64_t) * CHAR_BIT
+ trace_clock_name(),
+ lttng_alignof(uint64_t) * CHAR_BIT,
+ trace_clock_name()
);
if (ret)
goto end;
}
EXPORT_SYMBOL_GPL(lttng_transport_unregister);
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))
+
+enum cpuhp_state lttng_hp_prepare;
+enum cpuhp_state lttng_hp_online;
+
+static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node)
+{
+ struct lttng_cpuhp_node *lttng_node;
+
+ lttng_node = container_of(node, struct lttng_cpuhp_node, node);
+ switch (lttng_node->component) {
+ case LTTNG_RING_BUFFER_FRONTEND:
+ return 0;
+ case LTTNG_RING_BUFFER_BACKEND:
+ return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node);
+ case LTTNG_RING_BUFFER_ITER:
+ return 0;
+ case LTTNG_CONTEXT_PERF_COUNTERS:
+ return 0;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node)
+{
+ struct lttng_cpuhp_node *lttng_node;
+
+ lttng_node = container_of(node, struct lttng_cpuhp_node, node);
+ switch (lttng_node->component) {
+ case LTTNG_RING_BUFFER_FRONTEND:
+ return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node);
+ case LTTNG_RING_BUFFER_BACKEND:
+ return 0;
+ case LTTNG_RING_BUFFER_ITER:
+ return 0;
+ case LTTNG_CONTEXT_PERF_COUNTERS:
+ return lttng_cpuhp_perf_counter_dead(cpu, lttng_node);
+ default:
+ return -EINVAL;
+ }
+}
+
+static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node)
+{
+ struct lttng_cpuhp_node *lttng_node;
+
+ lttng_node = container_of(node, struct lttng_cpuhp_node, node);
+ switch (lttng_node->component) {
+ case LTTNG_RING_BUFFER_FRONTEND:
+ return lttng_cpuhp_rb_frontend_online(cpu, lttng_node);
+ case LTTNG_RING_BUFFER_BACKEND:
+ return 0;
+ case LTTNG_RING_BUFFER_ITER:
+ return lttng_cpuhp_rb_iter_online(cpu, lttng_node);
+ case LTTNG_CONTEXT_PERF_COUNTERS:
+ return lttng_cpuhp_perf_counter_online(cpu, lttng_node);
+ default:
+ return -EINVAL;
+ }
+}
+
+static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node)
+{
+ struct lttng_cpuhp_node *lttng_node;
+
+ lttng_node = container_of(node, struct lttng_cpuhp_node, node);
+ switch (lttng_node->component) {
+ case LTTNG_RING_BUFFER_FRONTEND:
+ return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node);
+ case LTTNG_RING_BUFFER_BACKEND:
+ return 0;
+ case LTTNG_RING_BUFFER_ITER:
+ return 0;
+ case LTTNG_CONTEXT_PERF_COUNTERS:
+ return 0;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int __init lttng_init_cpu_hotplug(void)
+{
+ int ret;
+
+ ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare",
+ lttng_hotplug_prepare,
+ lttng_hotplug_dead);
+ if (ret < 0) {
+ return ret;
+ }
+ lttng_hp_prepare = ret;
+ lttng_rb_set_hp_prepare(ret);
+
+ ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online",
+ lttng_hotplug_online,
+ lttng_hotplug_offline);
+ if (ret < 0) {
+ cpuhp_remove_multi_state(lttng_hp_prepare);
+ lttng_hp_prepare = 0;
+ return ret;
+ }
+ lttng_hp_online = ret;
+ lttng_rb_set_hp_online(ret);
+
+ return 0;
+}
+
+static void __exit lttng_exit_cpu_hotplug(void)
+{
+ lttng_rb_set_hp_online(0);
+ cpuhp_remove_multi_state(lttng_hp_online);
+ lttng_rb_set_hp_prepare(0);
+ cpuhp_remove_multi_state(lttng_hp_prepare);
+}
+
+#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
+static int lttng_init_cpu_hotplug(void)
+{
+ return 0;
+}
+static void lttng_exit_cpu_hotplug(void)
+{
+}
+#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
+
+
static int __init lttng_events_init(void)
{
int ret;
+ ret = wrapper_lttng_fixup_sig(THIS_MODULE);
+ if (ret)
+ return ret;
+ ret = wrapper_get_pfnblock_flags_mask_init();
+ if (ret)
+ return ret;
+ ret = wrapper_get_pageblock_flags_mask_init();
+ if (ret)
+ return ret;
+ ret = lttng_probes_init();
+ if (ret)
+ return ret;
+ ret = lttng_context_init();
+ if (ret)
+ return ret;
+ ret = lttng_tracepoint_init();
+ if (ret)
+ goto error_tp;
event_cache = KMEM_CACHE(lttng_event, 0);
- if (!event_cache)
- return -ENOMEM;
+ if (!event_cache) {
+ ret = -ENOMEM;
+ goto error_kmem;
+ }
ret = lttng_abi_init();
if (ret)
goto error_abi;
ret = lttng_logger_init();
if (ret)
goto error_logger;
+ ret = lttng_init_cpu_hotplug();
+ if (ret)
+ goto error_hotplug;
+ printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
+ __stringify(LTTNG_MODULES_MAJOR_VERSION),
+ __stringify(LTTNG_MODULES_MINOR_VERSION),
+ __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
+ LTTNG_MODULES_EXTRAVERSION,
+ LTTNG_VERSION_NAME,
+#ifdef LTTNG_EXTRA_VERSION_GIT
+ LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
+#else
+ "",
+#endif
+#ifdef LTTNG_EXTRA_VERSION_NAME
+ LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
+#else
+ "");
+#endif
return 0;
+error_hotplug:
+ lttng_logger_exit();
error_logger:
lttng_abi_exit();
error_abi:
kmem_cache_destroy(event_cache);
+error_kmem:
+ lttng_tracepoint_exit();
+error_tp:
+ lttng_context_exit();
+ printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
+ __stringify(LTTNG_MODULES_MAJOR_VERSION),
+ __stringify(LTTNG_MODULES_MINOR_VERSION),
+ __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
+ LTTNG_MODULES_EXTRAVERSION,
+ LTTNG_VERSION_NAME,
+#ifdef LTTNG_EXTRA_VERSION_GIT
+ LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
+#else
+ "",
+#endif
+#ifdef LTTNG_EXTRA_VERSION_NAME
+ LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
+#else
+ "");
+#endif
return ret;
}
{
struct lttng_session *session, *tmpsession;
+ lttng_exit_cpu_hotplug();
lttng_logger_exit();
lttng_abi_exit();
list_for_each_entry_safe(session, tmpsession, &sessions, list)
lttng_session_destroy(session);
kmem_cache_destroy(event_cache);
+ lttng_tracepoint_exit();
+ lttng_context_exit();
+ printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
+ __stringify(LTTNG_MODULES_MAJOR_VERSION),
+ __stringify(LTTNG_MODULES_MINOR_VERSION),
+ __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
+ LTTNG_MODULES_EXTRAVERSION,
+ LTTNG_VERSION_NAME,
+#ifdef LTTNG_EXTRA_VERSION_GIT
+ LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
+#else
+ "",
+#endif
+#ifdef LTTNG_EXTRA_VERSION_NAME
+ LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
+#else
+ "");
+#endif
}
module_exit(lttng_events_exit);
+#include "extra_version/patches.i"
+#ifdef LTTNG_EXTRA_VERSION_GIT
+MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT);
+#endif
+#ifdef LTTNG_EXTRA_VERSION_NAME
+MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME);
+#endif
MODULE_LICENSE("GPL and additional rights");
MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
-MODULE_DESCRIPTION("LTTng Events");
+MODULE_DESCRIPTION("LTTng tracer");
MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
__stringify(LTTNG_MODULES_MINOR_VERSION) "."
__stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
projects / lttng-modules.git / blobdiff