-/*
+/* 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
*/
/*
#include <linux/seq_file.h>
#include <linux/file.h>
#include <linux/anon_inodes.h>
-#include "wrapper/file.h"
+#include <wrapper/file.h>
#include <linux/jhash.h>
#include <linux/uaccess.h>
#include <linux/vmalloc.h>
-
-#include "wrapper/uuid.h"
-#include "wrapper/vmalloc.h" /* for wrapper_vmalloc_sync_all() */
-#include "wrapper/random.h"
-#include "wrapper/tracepoint.h"
-#include "wrapper/list.h"
-#include "lttng-kernel-version.h"
-#include "lttng-events.h"
-#include "lttng-tracer.h"
-#include "lttng-abi-old.h"
-#include "wrapper/vzalloc.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
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();
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 = lttng_vzalloc(METADATA_CACHE_DEFAULT_SIZE);
+ metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE);
if (!metadata_cache->data)
goto err_free_cache;
metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE;
err_free_cache:
kfree(metadata_cache);
err_free_session:
- kfree(session);
+ lttng_kvfree(session);
err:
mutex_unlock(&sessions_mutex);
return NULL;
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);
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)
/* 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 */
}
- /* We need to sync enablers with session before activation. */
- lttng_session_sync_enablers(session);
+ /* 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);
+ }
- ACCESS_ONCE(session->active) = 1;
- ACCESS_ONCE(session->been_active) = 1;
+ 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;
}
- ACCESS_ONCE(session->active) = 0;
+ 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;
+ }
+
+ 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;
channel->tstate = 1;
lttng_session_sync_enablers(channel->session);
/* Set atomically the state to "enabled" */
- ACCESS_ONCE(channel->enabled) = 1;
+ WRITE_ONCE(channel->enabled, 1);
end:
mutex_unlock(&sessions_mutex);
return ret;
goto end;
}
/* Set atomically the state to "disabled" */
- ACCESS_ONCE(channel->enabled) = 0;
+ WRITE_ONCE(channel->enabled, 0);
/* Set transient enabler state to "enabled" */
channel->tstate = 0;
lttng_session_sync_enablers(channel->session);
break;
case LTTNG_KERNEL_KPROBE:
case LTTNG_KERNEL_FUNCTION:
+ case LTTNG_KERNEL_UPROBE:
case LTTNG_KERNEL_NOOP:
- ACCESS_ONCE(event->enabled) = 1;
+ WRITE_ONCE(event->enabled, 1);
break;
case LTTNG_KERNEL_KRETPROBE:
ret = lttng_kretprobes_event_enable_state(event, 1);
break;
case LTTNG_KERNEL_KPROBE:
case LTTNG_KERNEL_FUNCTION:
+ case LTTNG_KERNEL_UPROBE:
case LTTNG_KERNEL_NOOP:
- ACCESS_ONCE(event->enabled) = 0;
+ WRITE_ONCE(event->enabled, 0);
break;
case LTTNG_KERNEL_KRETPROBE:
ret = lttng_kretprobes_event_enable_state(event, 0);
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:
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;
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_NOOP:
ret = 0;
break;
+ case LTTNG_KERNEL_UPROBE:
+ lttng_uprobes_unregister(event);
+ ret = 0;
+ break;
default:
WARN_ON_ONCE(1);
}
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);
}
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);
- atomic_long_inc(&session->file->f_count);
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);
* Enabler management.
*/
static
-int lttng_match_enabler_wildcard(const char *desc_name,
- const char *name)
+int lttng_match_enabler_star_glob(const char *desc_name,
+ const char *pattern)
{
- /* Compare excluding final '*' */
- if (strncmp(desc_name, name, strlen(name) - 1))
+ if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX,
+ desc_name, LTTNG_SIZE_MAX))
return 0;
return 1;
}
return -EINVAL;
}
switch (enabler->type) {
- case LTTNG_ENABLER_WILDCARD:
- return lttng_match_enabler_wildcard(desc_name, enabler_name);
+ 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 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)
{
*/
enabled = enabled && session->tstate && event->chan->tstate;
- ACCESS_ONCE(event->enabled) = enabled;
+ WRITE_ONCE(event->enabled, enabled);
/*
* Sync tracepoint registration with event enabled
* state.
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)
va_list ap;
struct lttng_metadata_stream *stream;
- WARN_ON_ONCE(!ACCESS_ONCE(session->active));
+ WARN_ON_ONCE(!READ_ONCE(session->active));
va_start(ap, fmt);
str = kvasprintf(GFP_KERNEL, fmt, ap);
tmp_cache_alloc_size = max_t(unsigned int,
session->metadata_cache->cache_alloc + len,
session->metadata_cache->cache_alloc << 1);
- tmp_cache_realloc = lttng_vzalloc(tmp_cache_alloc_size);
+ tmp_cache_realloc = vzalloc(tmp_cache_alloc_size);
if (!tmp_cache_realloc)
goto err;
if (session->metadata_cache->data) {
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;
+}
+
+/*
+ * Must be called with sessions_mutex held.
+ */
+static
+int _lttng_sequence_compound_statedump(struct lttng_session *session,
+ const struct lttng_event_field *field,
+ size_t nesting)
+{
+ int ret;
+ const char *length_name;
+ const struct lttng_type *elem_type;
+
+ length_name = field->type.u.sequence_compound.length_name;
+
+ /* 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;
+ }
+ ret = lttng_metadata_printf(session,
+ " _%s[ _%s ];\n",
+ field->name,
+ length_name);
+ return ret;
+}
+
+/*
+ * Must be called with sessions_mutex held.
+ */
+static
+int _lttng_enum_statedump(struct lttng_session *session,
+ const struct lttng_event_field *field,
+ size_t nesting)
+{
+ const struct lttng_enum_desc *enum_desc;
+ const struct lttng_integer_type *container_type;
+ int ret;
+ unsigned int i, nr_entries;
+
+ enum_desc = field->type.u.basic.enumeration.desc;
+ container_type = &field->type.u.basic.enumeration.container_type;
+ nr_entries = enum_desc->nr_entries;
+
+ 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;
+
+ 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;
+
+ 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;
+ }
+ }
+ ret = print_tabs(session, nesting);
+ if (ret)
+ goto end;
+ ret = lttng_metadata_printf(session, "} _%s;\n",
+ field->name);
+end:
+ return ret;
+}
+
/*
* Must be called with sessions_mutex held.
*/
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)
* 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;
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;
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();
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:
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)
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