* Dual LGPL v2.1/GPL v2 license.
*/
-#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/uuid.h>
-#include "wrapper/vmalloc.h" /* for wrapper_vmalloc_sync_all() */
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <urcu/list.h>
+#include <pthread.h>
+#include <urcu-bp.h>
+#include <urcu/compiler.h>
+#include <urcu/uatomic.h>
+#include <uuid/uuid.h>
+#include <ust/tracepoint.h>
+#include <errno.h>
+#include "usterr_signal_safe.h"
+#include "ust/core.h"
#include "ltt-events.h"
#include "ltt-tracer.h"
+#include "ust/wait.h"
-static LIST_HEAD(sessions);
-static LIST_HEAD(ltt_transport_list);
+static CDS_LIST_HEAD(sessions);
+static CDS_LIST_HEAD(ltt_transport_list);
static DEFINE_MUTEX(sessions_mutex);
-static struct kmem_cache *event_cache;
static void _ltt_event_destroy(struct ltt_event *event);
static void _ltt_channel_destroy(struct ltt_channel *chan);
void synchronize_trace(void)
{
- synchronize_sched();
-#ifdef CONFIG_PREEMPT_RT
synchronize_rcu();
-#endif
}
struct ltt_session *ltt_session_create(void)
{
struct ltt_session *session;
- mutex_lock(&sessions_mutex);
- session = kzalloc(sizeof(struct ltt_session), GFP_KERNEL);
+ pthread_mutex_lock(&sessions_mutex);
+ session = zmalloc(sizeof(struct ltt_session));
if (!session)
return NULL;
- INIT_LIST_HEAD(&session->chan);
- INIT_LIST_HEAD(&session->events);
- uuid_le_gen(&session->uuid);
- list_add(&session->list, &sessions);
- mutex_unlock(&sessions_mutex);
+ CDS_INIT_LIST_HEAD(&session->chan);
+ CDS_INIT_LIST_HEAD(&session->events);
+ uuid_generate(session->uuid);
+ cds_list_add(&session->list, &sessions);
+ pthread_mutex_unlock(&sessions_mutex);
return session;
}
struct ltt_event *event, *tmpevent;
int ret;
- mutex_lock(&sessions_mutex);
- ACCESS_ONCE(session->active) = 0;
- list_for_each_entry(event, &session->events, list) {
+ pthread_mutex_lock(&sessions_mutex);
+ CMM_ACCESS_ONCE(session->active) = 0;
+ cds_list_for_each_entry(event, &session->events, list) {
ret = _ltt_event_unregister(event);
WARN_ON(ret);
}
synchronize_trace(); /* Wait for in-flight events to complete */
- list_for_each_entry_safe(event, tmpevent, &session->events, list)
+ cds_list_for_each_entry_safe(event, tmpevent, &session->events, list)
_ltt_event_destroy(event);
- list_for_each_entry_safe(chan, tmpchan, &session->chan, list)
+ cds_list_for_each_entry_safe(chan, tmpchan, &session->chan, list)
_ltt_channel_destroy(chan);
- list_del(&session->list);
- mutex_unlock(&sessions_mutex);
- kfree(session);
+ cds_list_del(&session->list);
+ pthread_mutex_unlock(&sessions_mutex);
+ free(session);
}
int ltt_session_enable(struct ltt_session *session)
int ret = 0;
struct ltt_channel *chan;
- mutex_lock(&sessions_mutex);
+ pthread_mutex_lock(&sessions_mutex);
if (session->active) {
ret = -EBUSY;
goto end;
* Snapshot the number of events per channel to know the type of header
* we need to use.
*/
- list_for_each_entry(chan, &session->chan, list) {
+ cds_list_for_each_entry(chan, &session->chan, list) {
if (chan->header_type)
continue; /* don't change it if session stop/restart */
if (chan->free_event_id < 31)
chan->header_type = 2; /* large */
}
- ACCESS_ONCE(session->active) = 1;
- ACCESS_ONCE(session->been_active) = 1;
+ CMM_ACCESS_ONCE(session->active) = 1;
+ CMM_ACCESS_ONCE(session->been_active) = 1;
ret = _ltt_session_metadata_statedump(session);
if (ret)
- ACCESS_ONCE(session->active) = 0;
+ CMM_ACCESS_ONCE(session->active) = 0;
end:
- mutex_unlock(&sessions_mutex);
+ pthread_mutex_unlock(&sessions_mutex);
return ret;
}
{
int ret = 0;
- mutex_lock(&sessions_mutex);
+ pthread_mutex_lock(&sessions_mutex);
if (!session->active) {
ret = -EBUSY;
goto end;
}
- ACCESS_ONCE(session->active) = 0;
+ CMM_ACCESS_ONCE(session->active) = 0;
end:
- mutex_unlock(&sessions_mutex);
+ pthread_mutex_unlock(&sessions_mutex);
return ret;
}
if (channel == channel->session->metadata)
return -EPERM;
- old = xchg(&channel->enabled, 1);
+ old = uatomic_xchg(&channel->enabled, 1);
if (old)
return -EEXIST;
return 0;
if (channel == channel->session->metadata)
return -EPERM;
- old = xchg(&channel->enabled, 0);
+ old = uatomic_xchg(&channel->enabled, 0);
if (!old)
return -EEXIST;
return 0;
if (event->chan == event->chan->session->metadata)
return -EPERM;
- old = xchg(&event->enabled, 1);
+ old = uatomic_xchg(&event->enabled, 1);
if (old)
return -EEXIST;
return 0;
if (event->chan == event->chan->session->metadata)
return -EPERM;
- old = xchg(&event->enabled, 0);
+ old = uatomic_xchg(&event->enabled, 0);
if (!old)
return -EEXIST;
return 0;
{
struct ltt_transport *transport;
- list_for_each_entry(transport, <t_transport_list, node) {
+ cds_list_for_each_entry(transport, <t_transport_list, node) {
if (!strcmp(transport->name, name))
return transport;
}
void *buf_addr,
size_t subbuf_size, size_t num_subbuf,
unsigned int switch_timer_interval,
- unsigned int read_timer_interval)
+ unsigned int read_timer_interval,
+ int *shmid)
{
struct ltt_channel *chan;
struct ltt_transport *transport;
- mutex_lock(&sessions_mutex);
+ pthread_mutex_lock(&sessions_mutex);
if (session->been_active)
goto active; /* Refuse to add channel to active session */
transport = ltt_transport_find(transport_name);
if (!transport) {
- printk(KERN_WARNING "LTTng transport %s not found\n",
+ DBG("LTTng transport %s not found\n",
transport_name);
goto notransport;
}
- chan = kzalloc(sizeof(struct ltt_channel), GFP_KERNEL);
+ chan = zmalloc(sizeof(struct ltt_channel));
if (!chan)
goto nomem;
chan->session = session;
*/
chan->chan = transport->ops.channel_create("[lttng]", chan, buf_addr,
subbuf_size, num_subbuf, switch_timer_interval,
- read_timer_interval);
+ read_timer_interval, shmid);
if (!chan->chan)
goto create_error;
chan->enabled = 1;
chan->ops = &transport->ops;
- list_add(&chan->list, &session->chan);
- mutex_unlock(&sessions_mutex);
+ cds_list_add(&chan->list, &session->chan);
+ pthread_mutex_unlock(&sessions_mutex);
return chan;
create_error:
- kfree(chan);
+ free(chan);
nomem:
notransport:
active:
- mutex_unlock(&sessions_mutex);
+ pthread_mutex_unlock(&sessions_mutex);
return NULL;
}
void _ltt_channel_destroy(struct ltt_channel *chan)
{
chan->ops->channel_destroy(chan->chan);
- list_del(&chan->list);
+ cds_list_del(&chan->list);
lttng_destroy_context(chan->ctx);
- kfree(chan);
+ free(chan);
}
/*
* Supports event creation while tracing session is active.
*/
struct ltt_event *ltt_event_create(struct ltt_channel *chan,
- struct lttng_kernel_event *event_param,
+ struct lttng_ust_event *event_param,
void *filter)
{
struct ltt_event *event;
int ret;
- mutex_lock(&sessions_mutex);
+ pthread_mutex_lock(&sessions_mutex);
if (chan->free_event_id == -1UL)
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)
+ cds_list_for_each_entry(event, &chan->session->events, list)
if (!strcmp(event->desc->name, event_param->name))
goto exist;
- event = kmem_cache_zalloc(event_cache, GFP_KERNEL);
+ event = zmalloc(sizeof(struct ltt_event));
if (!event)
goto cache_error;
event->chan = chan;
event->enabled = 1;
event->instrumentation = event_param->instrumentation;
/* Populate ltt_event structure before tracepoint registration. */
- smp_wmb();
+ cmm_smp_wmb();
switch (event_param->instrumentation) {
- case LTTNG_KERNEL_TRACEPOINT:
+ case LTTNG_UST_TRACEPOINT:
event->desc = ltt_event_get(event_param->name);
if (!event->desc)
goto register_error;
- ret = tracepoint_probe_register(event_param->name,
+ ret = __tracepoint_probe_register(event_param->name,
event->desc->probe_callback,
event);
if (ret)
goto register_error;
break;
- case LTTNG_KERNEL_KPROBE:
- ret = lttng_kprobes_register(event_param->name,
- event_param->u.kprobe.symbol_name,
- event_param->u.kprobe.offset,
- event_param->u.kprobe.addr,
- event);
- if (ret)
- goto register_error;
- ret = try_module_get(event->desc->owner);
- WARN_ON_ONCE(!ret);
- break;
- case LTTNG_KERNEL_FUNCTION:
- ret = lttng_ftrace_register(event_param->name,
- event_param->u.ftrace.symbol_name,
- event);
- if (ret)
- goto register_error;
- ret = try_module_get(event->desc->owner);
- WARN_ON_ONCE(!ret);
- break;
default:
WARN_ON_ONCE(1);
}
ret = _ltt_event_metadata_statedump(chan->session, chan, event);
if (ret)
goto statedump_error;
- list_add(&event->list, &chan->session->events);
- mutex_unlock(&sessions_mutex);
+ cds_list_add(&event->list, &chan->session->events);
+ pthread_mutex_unlock(&sessions_mutex);
return event;
statedump_error:
- WARN_ON_ONCE(tracepoint_probe_unregister(event_param->name,
+ WARN_ON_ONCE(__tracepoint_probe_unregister(event_param->name,
event->desc->probe_callback,
event));
ltt_event_put(event->desc);
register_error:
- kmem_cache_free(event_cache, event);
+ free(event);
cache_error:
exist:
full:
- mutex_unlock(&sessions_mutex);
+ pthread_mutex_unlock(&sessions_mutex);
return NULL;
}
int ret = -EINVAL;
switch (event->instrumentation) {
- case LTTNG_KERNEL_TRACEPOINT:
- ret = tracepoint_probe_unregister(event->desc->name,
+ case LTTNG_UST_TRACEPOINT:
+ ret = __tracepoint_probe_unregister(event->desc->name,
event->desc->probe_callback,
event);
if (ret)
return ret;
break;
- case LTTNG_KERNEL_KPROBE:
- lttng_kprobes_unregister(event);
- ret = 0;
- break;
- case LTTNG_KERNEL_FUNCTION:
- lttng_ftrace_unregister(event);
- ret = 0;
- break;
default:
WARN_ON_ONCE(1);
}
void _ltt_event_destroy(struct ltt_event *event)
{
switch (event->instrumentation) {
- case LTTNG_KERNEL_TRACEPOINT:
+ case LTTNG_UST_TRACEPOINT:
ltt_event_put(event->desc);
break;
- case LTTNG_KERNEL_KPROBE:
- module_put(event->desc->owner);
- lttng_kprobes_destroy_private(event);
- break;
- case LTTNG_KERNEL_FUNCTION:
- module_put(event->desc->owner);
- lttng_ftrace_destroy_private(event);
- break;
default:
WARN_ON_ONCE(1);
}
- list_del(&event->list);
+ cds_list_del(&event->list);
lttng_destroy_context(event->ctx);
- kmem_cache_free(event_cache, event);
+ free(event);
}
/*
{
struct lib_ring_buffer_ctx ctx;
struct ltt_channel *chan = session->metadata;
- char *str;
+ char *str = NULL;
int ret = 0, waitret;
size_t len, reserve_len, pos;
va_list ap;
- WARN_ON_ONCE(!ACCESS_ONCE(session->active));
+ WARN_ON_ONCE(!CMM_ACCESS_ONCE(session->active));
va_start(ap, fmt);
- str = kvasprintf(GFP_KERNEL, fmt, ap);
+ ret = vasprintf(&str, fmt, ap);
va_end(ap);
- if (!str)
+ if (ret < 0)
return -ENOMEM;
len = strlen(str);
* we need to bail out after timeout or being
* interrupted.
*/
- waitret = wait_event_interruptible_timeout(*chan->ops->get_reader_wait_queue(chan->chan),
+ waitret = wait_cond_interruptible_timeout(
({
ret = chan->ops->event_reserve(&ctx, 0);
ret != -ENOBUFS || !ret;
}),
- msecs_to_jiffies(LTTNG_METADATA_TIMEOUT_MSEC));
- if (!waitret || waitret == -ERESTARTSYS || ret) {
- printk(KERN_WARNING "LTTng: Failure to write metadata to buffers (%s)\n",
- waitret == -ERESTARTSYS ? "interrupted" :
+ LTTNG_METADATA_TIMEOUT_MSEC);
+ if (!waitret || waitret == -EINTR || ret) {
+ DBG("LTTng: Failure to write metadata to buffers (%s)\n",
+ waitret == -EINTR ? "interrupted" :
(ret == -ENOBUFS ? "timeout" : "I/O error"));
- if (waitret == -ERESTARTSYS)
+ if (waitret == -EINTR)
ret = waitret;
goto end;
}
chan->ops->event_commit(&ctx);
}
end:
- kfree(str);
+ free(str);
return ret;
}
? "UTF8"
: "ASCII",
field->type.u.basic.integer.base,
-#ifdef __BIG_ENDIAN
+#ifdef 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;" : "",
? "UTF8"
: "ASCII",
elem_type->u.basic.integer.base,
-#ifdef __BIG_ENDIAN
+#ifdef 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;" : "",
? "UTF8"
: "ASCII"),
length_type->u.basic.integer.base,
-#ifdef __BIG_ENDIAN
+#ifdef 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;" : "",
? "UTF8"
: "ASCII"),
elem_type->u.basic.integer.base,
-#ifdef __BIG_ENDIAN
+#ifdef 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;" : "",
{
int ret = 0;
- if (event->metadata_dumped || !ACCESS_ONCE(session->active))
+ if (event->metadata_dumped || !CMM_ACCESS_ONCE(session->active))
return 0;
if (chan == session->metadata)
return 0;
{
int ret = 0;
- if (chan->metadata_dumped || !ACCESS_ONCE(session->active))
+ if (chan->metadata_dumped || !CMM_ACCESS_ONCE(session->active))
return 0;
if (chan == session->metadata)
return 0;
static
int _ltt_session_metadata_statedump(struct ltt_session *session)
{
- unsigned char *uuid_c = session->uuid.b;
- unsigned char uuid_s[37];
+ unsigned char *uuid_c = session->uuid;
+ char uuid_s[37];
struct ltt_channel *chan;
struct ltt_event *event;
int ret = 0;
- if (!ACCESS_ONCE(session->active))
+ if (!CMM_ACCESS_ONCE(session->active))
return 0;
if (session->metadata_dumped)
goto skip_session;
if (!session->metadata) {
- printk(KERN_WARNING "LTTng: attempt to start tracing, but metadata channel is not found. Operation abort.\n");
+ DBG("LTTng: attempt to start tracing, but metadata channel is not found. Operation abort.\n");
return -EPERM;
}
CTF_VERSION_MAJOR,
CTF_VERSION_MINOR,
uuid_s,
-#ifdef __BIG_ENDIAN
+#ifdef BIG_ENDIAN
"be"
#else
"le"
goto end;
skip_session:
- list_for_each_entry(chan, &session->chan, list) {
+ cds_list_for_each_entry(chan, &session->chan, list) {
ret = _ltt_channel_metadata_statedump(session, chan);
if (ret)
goto end;
}
- list_for_each_entry(event, &session->events, list) {
+ cds_list_for_each_entry(event, &session->events, list) {
ret = _ltt_event_metadata_statedump(session, event->chan, event);
if (ret)
goto end;
* @transport: transport structure
*
* Registers a transport which can be used as output to extract the data out of
- * LTTng. The module calling this registration function must ensure that no
- * trap-inducing code will be executed by the transport functions. E.g.
- * vmalloc_sync_all() must be called between a vmalloc and the moment the memory
- * is made visible to the transport function. This registration acts as a
- * vmalloc_sync_all. Therefore, only if the module allocates virtual memory
- * after its registration must it synchronize the TLBs.
+ * LTTng.
*/
void ltt_transport_register(struct ltt_transport *transport)
{
- /*
- * Make sure no page fault can be triggered by the module about to be
- * registered. We deal with this here so we don't have to call
- * vmalloc_sync_all() in each module's init.
- */
- wrapper_vmalloc_sync_all();
-
- mutex_lock(&sessions_mutex);
- list_add_tail(&transport->node, <t_transport_list);
- mutex_unlock(&sessions_mutex);
+ pthread_mutex_lock(&sessions_mutex);
+ cds_list_add_tail(&transport->node, <t_transport_list);
+ pthread_mutex_unlock(&sessions_mutex);
}
-EXPORT_SYMBOL_GPL(ltt_transport_register);
/**
* ltt_transport_unregister - LTT transport unregistration
*/
void ltt_transport_unregister(struct ltt_transport *transport)
{
- mutex_lock(&sessions_mutex);
- list_del(&transport->node);
- mutex_unlock(&sessions_mutex);
-}
-EXPORT_SYMBOL_GPL(ltt_transport_unregister);
-
-static int __init ltt_events_init(void)
-{
- int ret;
-
- event_cache = KMEM_CACHE(ltt_event, 0);
- if (!event_cache)
- return -ENOMEM;
- ret = ltt_debugfs_abi_init();
- if (ret)
- goto error_abi;
- return 0;
-error_abi:
- kmem_cache_destroy(event_cache);
- return ret;
+ pthread_mutex_lock(&sessions_mutex);
+ cds_list_del(&transport->node);
+ pthread_mutex_unlock(&sessions_mutex);
}
-module_init(ltt_events_init);
-
-static void __exit ltt_events_exit(void)
+static
+void __attribute__((destructor)) ltt_events_exit(void)
{
struct ltt_session *session, *tmpsession;
- ltt_debugfs_abi_exit();
- list_for_each_entry_safe(session, tmpsession, &sessions, list)
+ cds_list_for_each_entry_safe(session, tmpsession, &sessions, list)
ltt_session_destroy(session);
- kmem_cache_destroy(event_cache);
}
-
-module_exit(ltt_events_exit);
-
-MODULE_LICENSE("GPL and additional rights");
-MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
-MODULE_DESCRIPTION("LTTng Events");
projects / lttng-ust.git / commitdiff
