-/*
+/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
+ *
* lttng-abi.c
*
* LTTng ABI
*
* 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
- *
- *
* Mimic system calls for:
* - session creation, returns a file descriptor or failure.
* - channel creation, returns a file descriptor or failure.
#include <linux/file.h>
#include <linux/uaccess.h>
#include <linux/slab.h>
-#include "wrapper/vmalloc.h" /* for wrapper_vmalloc_sync_all() */
-#include "wrapper/ringbuffer/vfs.h"
-#include "wrapper/ringbuffer/backend.h"
-#include "wrapper/ringbuffer/frontend.h"
-#include "wrapper/poll.h"
-#include "lttng-abi.h"
-#include "lttng-abi-old.h"
-#include "lttng-events.h"
-#include "lttng-tracer.h"
+#include <linux/err.h>
+#include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_all() */
+#include <wrapper/ringbuffer/vfs.h>
+#include <wrapper/ringbuffer/backend.h>
+#include <wrapper/ringbuffer/frontend.h>
+#include <wrapper/poll.h>
+#include <wrapper/file.h>
+#include <wrapper/kref.h>
+#include <lttng-string-utils.h>
+#include <lttng-abi.h>
+#include <lttng-abi-old.h>
+#include <lttng-events.h>
+#include <lttng-tracer.h>
+#include <lttng-tp-mempool.h>
+#include <lib/ringbuffer/frontend_types.h>
/*
* This is LTTng's own personal way to create a system call as an external
static const struct file_operations lttng_channel_fops;
static const struct file_operations lttng_metadata_fops;
static const struct file_operations lttng_event_fops;
+static struct file_operations lttng_stream_ring_buffer_file_operations;
+
+static int put_u64(uint64_t val, unsigned long arg);
/*
* Teardown management: opened file descriptors keep a refcount on the module,
session = lttng_session_create();
if (!session)
return -ENOMEM;
- session_fd = get_unused_fd();
+ session_fd = lttng_get_unused_fd();
if (session_fd < 0) {
ret = session_fd;
goto fd_error;
struct file *tracepoint_list_file;
int file_fd, ret;
- file_fd = get_unused_fd();
+ file_fd = lttng_get_unused_fd();
if (file_fd < 0) {
ret = file_fd;
goto fd_error;
}
- tracepoint_list_file = anon_inode_getfile("[lttng_session]",
+ tracepoint_list_file = anon_inode_getfile("[lttng_tracepoint_list]",
<tng_tracepoint_list_fops,
NULL, O_RDWR);
if (IS_ERR(tracepoint_list_file)) {
if (ret < 0)
goto open_error;
fd_install(file_fd, tracepoint_list_file);
+ return file_fd;
+
+open_error:
+ fput(tracepoint_list_file);
+file_error:
+ put_unused_fd(file_fd);
+fd_error:
+ return ret;
+}
+
+#ifndef CONFIG_HAVE_SYSCALL_TRACEPOINTS
+static inline
+int lttng_abi_syscall_list(void)
+{
+ return -ENOSYS;
+}
+#else
+static
+int lttng_abi_syscall_list(void)
+{
+ struct file *syscall_list_file;
+ int file_fd, ret;
+
+ file_fd = lttng_get_unused_fd();
if (file_fd < 0) {
ret = file_fd;
goto fd_error;
}
+
+ syscall_list_file = anon_inode_getfile("[lttng_syscall_list]",
+ <tng_syscall_list_fops,
+ NULL, O_RDWR);
+ if (IS_ERR(syscall_list_file)) {
+ ret = PTR_ERR(syscall_list_file);
+ goto file_error;
+ }
+ ret = lttng_syscall_list_fops.open(NULL, syscall_list_file);
+ if (ret < 0)
+ goto open_error;
+ fd_install(file_fd, syscall_list_file);
return file_fd;
open_error:
- fput(tracepoint_list_file);
+ fput(syscall_list_file);
file_error:
put_unused_fd(file_fd);
fd_error:
return ret;
}
+#endif
static
void lttng_abi_tracer_version(struct lttng_kernel_tracer_version *v)
v->patchlevel = LTTNG_MODULES_PATCHLEVEL_VERSION;
}
+static
+void lttng_abi_tracer_abi_version(struct lttng_kernel_tracer_abi_version *v)
+{
+ v->major = LTTNG_MODULES_ABI_MAJOR_VERSION;
+ v->minor = LTTNG_MODULES_ABI_MINOR_VERSION;
+}
+
static
long lttng_abi_add_context(struct file *file,
struct lttng_kernel_context *context_param,
return lttng_add_procname_to_ctx(ctx);
case LTTNG_KERNEL_CONTEXT_HOSTNAME:
return lttng_add_hostname_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_CPU_ID:
+ return lttng_add_cpu_id_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_INTERRUPTIBLE:
+ return lttng_add_interruptible_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_NEED_RESCHEDULE:
+ return lttng_add_need_reschedule_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_PREEMPTIBLE:
+ return lttng_add_preemptible_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_MIGRATABLE:
+ return lttng_add_migratable_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_CALLSTACK_KERNEL:
+ case LTTNG_KERNEL_CONTEXT_CALLSTACK_USER:
+ return lttng_add_callstack_to_ctx(ctx, context_param->ctx);
default:
return -EINVAL;
}
* Returns a file descriptor listing available tracepoints
* LTTNG_KERNEL_WAIT_QUIESCENT
* Returns after all previously running probes have completed
+ * LTTNG_KERNEL_TRACER_ABI_VERSION
+ * Returns the LTTng kernel tracer ABI version
*
* The returned session will be deleted when its file descriptor is closed.
*/
(struct lttng_kernel_tracer_version __user *) arg;
lttng_abi_tracer_version(&version);
-
+
+ if (copy_to_user(uversion, &version, sizeof(version)))
+ return -EFAULT;
+ return 0;
+ }
+ case LTTNG_KERNEL_TRACER_ABI_VERSION:
+ {
+ struct lttng_kernel_tracer_abi_version version;
+ struct lttng_kernel_tracer_abi_version *uversion =
+ (struct lttng_kernel_tracer_abi_version __user *) arg;
+
+ lttng_abi_tracer_abi_version(&version);
+
if (copy_to_user(uversion, &version, sizeof(version)))
return -EFAULT;
return 0;
case LTTNG_KERNEL_OLD_TRACEPOINT_LIST:
case LTTNG_KERNEL_TRACEPOINT_LIST:
return lttng_abi_tracepoint_list();
+ case LTTNG_KERNEL_SYSCALL_LIST:
+ return lttng_abi_syscall_list();
case LTTNG_KERNEL_OLD_WAIT_QUIESCENT:
case LTTNG_KERNEL_WAIT_QUIESCENT:
synchronize_trace();
int chan_fd;
int ret = 0;
- chan_fd = get_unused_fd();
+ chan_fd = lttng_get_unused_fd();
if (chan_fd < 0) {
ret = chan_fd;
goto fd_error;
fops = <tng_metadata_fops;
break;
}
-
+
chan_file = anon_inode_getfile("[lttng_channel]",
fops,
NULL, O_RDWR);
transport_name = "<unknown>";
break;
}
+ if (atomic_long_add_unless(&session_file->f_count,
+ 1, INT_MAX) == INT_MAX) {
+ goto refcount_error;
+ }
/*
* We tolerate no failure path after channel creation. It will stay
* invariant for the rest of the session.
chan->file = chan_file;
chan_file->private_data = chan;
fd_install(chan_fd, chan_file);
- atomic_long_inc(&session_file->f_count);
return chan_fd;
chan_error:
+ atomic_long_dec(&session_file->f_count);
+refcount_error:
fput(chan_file);
file_error:
put_unused_fd(chan_fd);
* Disables tracing for a session (strong disable)
* LTTNG_KERNEL_METADATA
* Returns a LTTng metadata file descriptor
+ * LTTNG_KERNEL_SESSION_TRACK_PID
+ * Add PID to session tracker
+ * LTTNG_KERNEL_SESSION_UNTRACK_PID
+ * Remove PID from session tracker
*
* The returned channel will be deleted when its file descriptor is closed.
*/
return lttng_abi_create_channel(file, &chan_param,
METADATA_CHANNEL);
}
+ case LTTNG_KERNEL_SESSION_TRACK_PID:
+ return lttng_session_track_pid(session, (int) arg);
+ case LTTNG_KERNEL_SESSION_UNTRACK_PID:
+ return lttng_session_untrack_pid(session, (int) arg);
+ case LTTNG_KERNEL_SESSION_LIST_TRACKER_PIDS:
+ return lttng_session_list_tracker_pids(session);
+ case LTTNG_KERNEL_SESSION_METADATA_REGEN:
+ return lttng_session_metadata_regenerate(session);
+ case LTTNG_KERNEL_SESSION_STATEDUMP:
+ return lttng_session_statedump(session);
default:
return -ENOIOCTLCMD;
}
if (finalized)
mask |= POLLHUP;
+ mutex_lock(&stream->metadata_cache->lock);
if (stream->metadata_cache->metadata_written >
- stream->metadata_cache_read)
+ stream->metadata_out)
mask |= POLLIN;
+ mutex_unlock(&stream->metadata_cache->lock);
}
return mask;
}
static
-int lttng_metadata_ring_buffer_ioctl_get_subbuf(struct file *filp,
+void lttng_metadata_ring_buffer_ioctl_put_next_subbuf(struct file *filp,
unsigned int cmd, unsigned long arg)
{
struct lttng_metadata_stream *stream = filp->private_data;
- struct lib_ring_buffer *buf = stream->priv;
- struct channel *chan = buf->backend.chan;
- struct lttng_channel *lttng_chan = channel_get_private(chan);
+
+ stream->metadata_out = stream->metadata_in;
+}
+
+/*
+ * Reset the counter of how much metadata has been consumed to 0. That way,
+ * the consumer receives the content of the metadata cache unchanged. This is
+ * different from the metadata_regenerate where the offset from epoch is
+ * resampled, here we want the exact same content as the last time the metadata
+ * was generated. This command is only possible if all the metadata written
+ * in the cache has been output to the metadata stream to avoid corrupting the
+ * metadata file.
+ *
+ * Return 0 on success, a negative value on error.
+ */
+static
+int lttng_metadata_cache_dump(struct lttng_metadata_stream *stream)
+{
int ret;
+ struct lttng_metadata_cache *cache = stream->metadata_cache;
- ret = lttng_metadata_output_channel(lttng_chan, stream);
- if (ret > 0) {
- lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE);
- ret = 0;
+ mutex_lock(&cache->lock);
+ if (stream->metadata_out != cache->metadata_written) {
+ ret = -EBUSY;
+ goto end;
}
+ stream->metadata_out = 0;
+ stream->metadata_in = 0;
+ wake_up_interruptible(&stream->read_wait);
+ ret = 0;
+
+end:
+ mutex_unlock(&cache->lock);
return ret;
}
struct lib_ring_buffer *buf = stream->priv;
switch (cmd) {
- case RING_BUFFER_GET_SUBBUF:
case RING_BUFFER_GET_NEXT_SUBBUF:
{
- ret = lttng_metadata_ring_buffer_ioctl_get_subbuf(filp,
- cmd, arg);
+ struct lttng_metadata_stream *stream = filp->private_data;
+ struct lib_ring_buffer *buf = stream->priv;
+ struct channel *chan = buf->backend.chan;
+
+ ret = lttng_metadata_output_channel(stream, chan);
+ if (ret > 0) {
+ lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE);
+ ret = 0;
+ } else if (ret < 0)
+ goto err;
+ break;
+ }
+ case RING_BUFFER_GET_SUBBUF:
+ {
+ /*
+ * Random access is not allowed for metadata channel.
+ */
+ return -ENOSYS;
+ }
+ case RING_BUFFER_FLUSH_EMPTY: /* Fall-through. */
+ case RING_BUFFER_FLUSH:
+ {
+ struct lttng_metadata_stream *stream = filp->private_data;
+ struct lib_ring_buffer *buf = stream->priv;
+ struct channel *chan = buf->backend.chan;
+
+ /*
+ * Before doing the actual ring buffer flush, write up to one
+ * packet of metadata in the ring buffer.
+ */
+ ret = lttng_metadata_output_channel(stream, chan);
if (ret < 0)
goto err;
break;
}
+ case RING_BUFFER_GET_METADATA_VERSION:
+ {
+ struct lttng_metadata_stream *stream = filp->private_data;
+
+ return put_u64(stream->version, arg);
+ }
+ case RING_BUFFER_METADATA_CACHE_DUMP:
+ {
+ struct lttng_metadata_stream *stream = filp->private_data;
+
+ return lttng_metadata_cache_dump(stream);
+ }
default:
break;
}
+ /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */
+
/* Performing lib ring buffer ioctl after our own. */
- return lib_ring_buffer_ioctl(filp, cmd, arg, buf);
+ ret = lib_ring_buffer_ioctl(filp, cmd, arg, buf);
+ if (ret < 0)
+ goto err;
+ switch (cmd) {
+ case RING_BUFFER_PUT_NEXT_SUBBUF:
+ {
+ lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp,
+ cmd, arg);
+ break;
+ }
+ default:
+ break;
+ }
err:
return ret;
}
struct lib_ring_buffer *buf = stream->priv;
switch (cmd) {
- case RING_BUFFER_GET_SUBBUF:
case RING_BUFFER_GET_NEXT_SUBBUF:
{
- ret = lttng_metadata_ring_buffer_ioctl_get_subbuf(filp,
- cmd, arg);
+ struct lttng_metadata_stream *stream = filp->private_data;
+ struct lib_ring_buffer *buf = stream->priv;
+ struct channel *chan = buf->backend.chan;
+
+ ret = lttng_metadata_output_channel(stream, chan);
+ if (ret > 0) {
+ lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE);
+ ret = 0;
+ } else if (ret < 0)
+ goto err;
+ break;
+ }
+ case RING_BUFFER_GET_SUBBUF:
+ {
+ /*
+ * Random access is not allowed for metadata channel.
+ */
+ return -ENOSYS;
+ }
+ case RING_BUFFER_FLUSH_EMPTY: /* Fall-through. */
+ case RING_BUFFER_FLUSH:
+ {
+ struct lttng_metadata_stream *stream = filp->private_data;
+ struct lib_ring_buffer *buf = stream->priv;
+ struct channel *chan = buf->backend.chan;
+
+ /*
+ * Before doing the actual ring buffer flush, write up to one
+ * packet of metadata in the ring buffer.
+ */
+ ret = lttng_metadata_output_channel(stream, chan);
if (ret < 0)
goto err;
break;
}
+ case RING_BUFFER_GET_METADATA_VERSION:
+ {
+ struct lttng_metadata_stream *stream = filp->private_data;
+
+ return put_u64(stream->version, arg);
+ }
+ case RING_BUFFER_METADATA_CACHE_DUMP:
+ {
+ struct lttng_metadata_stream *stream = filp->private_data;
+
+ return lttng_metadata_cache_dump(stream);
+ }
default:
break;
}
+ /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */
+
/* Performing lib ring buffer ioctl after our own. */
- return lib_ring_buffer_compat_ioctl(filp, cmd, arg, buf);
+ ret = lib_ring_buffer_compat_ioctl(filp, cmd, arg, buf);
+ if (ret < 0)
+ goto err;
+ switch (cmd) {
+ case RING_BUFFER_PUT_NEXT_SUBBUF:
+ {
+ lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp,
+ cmd, arg);
+ break;
+ }
+ default:
+ break;
+ }
err:
return ret;
}
#endif
+/*
+ * This is not used by anonymous file descriptors. This code is left
+ * there if we ever want to implement an inode with open() operation.
+ */
static
int lttng_metadata_ring_buffer_open(struct inode *inode, struct file *file)
{
struct lib_ring_buffer *buf = stream->priv;
file->private_data = buf;
+ /*
+ * Since life-time of metadata cache differs from that of
+ * session, we need to keep our own reference on the transport.
+ */
+ if (!try_module_get(stream->transport->owner)) {
+ printk(KERN_WARNING "LTT : Can't lock transport module.\n");
+ return -EBUSY;
+ }
return lib_ring_buffer_open(inode, file, buf);
}
struct lib_ring_buffer *buf = stream->priv;
kref_put(&stream->metadata_cache->refcount, metadata_cache_destroy);
-
+ module_put(stream->transport->owner);
return lib_ring_buffer_release(inode, file, buf);
}
int stream_fd, ret;
struct file *stream_file;
- stream_fd = get_unused_fd();
+ stream_fd = lttng_get_unused_fd();
if (stream_fd < 0) {
ret = stream_fd;
goto fd_error;
stream_priv = buf;
ret = lttng_abi_create_stream_fd(channel_file, stream_priv,
- &lib_ring_buffer_file_operations);
+ <tng_stream_ring_buffer_file_operations);
if (ret < 0)
goto fd_error;
metadata_stream = kzalloc(sizeof(struct lttng_metadata_stream),
GFP_KERNEL);
- if (!metadata_stream)
- return -ENOMEM;
+ if (!metadata_stream) {
+ ret = -ENOMEM;
+ goto nomem;
+ }
metadata_stream->metadata_cache = session->metadata_cache;
init_waitqueue_head(&metadata_stream->read_wait);
metadata_stream->priv = buf;
stream_priv = metadata_stream;
+ metadata_stream->transport = channel->transport;
+
+ /*
+ * Since life-time of metadata cache differs from that of
+ * session, we need to keep our own reference on the transport.
+ */
+ if (!try_module_get(metadata_stream->transport->owner)) {
+ printk(KERN_WARNING "LTT : Can't lock transport module.\n");
+ ret = -EINVAL;
+ goto notransport;
+ }
+
+ if (!lttng_kref_get(&session->metadata_cache->refcount)) {
+ ret = -EOVERFLOW;
+ goto kref_error;
+ }
+
ret = lttng_abi_create_stream_fd(channel_file, stream_priv,
<tng_metadata_ring_buffer_file_operations);
if (ret < 0)
goto fd_error;
- kref_get(&session->metadata_cache->refcount);
list_add(&metadata_stream->list,
&session->metadata_cache->metadata_stream);
return ret;
fd_error:
+ kref_put(&session->metadata_cache->refcount, metadata_cache_destroy);
+kref_error:
+ module_put(metadata_stream->transport->owner);
+notransport:
+ kfree(metadata_stream);
+nomem:
channel->ops->buffer_read_close(buf);
return ret;
}
struct lttng_kernel_event *event_param)
{
struct lttng_channel *channel = channel_file->private_data;
- struct lttng_event *event;
int event_fd, ret;
struct file *event_file;
+ void *priv;
event_param->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
switch (event_param->instrumentation) {
default:
break;
}
- switch (event_param->instrumentation) {
- default:
- event_fd = get_unused_fd();
- if (event_fd < 0) {
- ret = event_fd;
- goto fd_error;
- }
- event_file = anon_inode_getfile("[lttng_event]",
- <tng_event_fops,
- NULL, O_RDWR);
- if (IS_ERR(event_file)) {
- ret = PTR_ERR(event_file);
- goto file_error;
+ event_fd = lttng_get_unused_fd();
+ if (event_fd < 0) {
+ ret = event_fd;
+ goto fd_error;
+ }
+ event_file = anon_inode_getfile("[lttng_event]",
+ <tng_event_fops,
+ NULL, O_RDWR);
+ if (IS_ERR(event_file)) {
+ ret = PTR_ERR(event_file);
+ goto file_error;
+ }
+ /* The event holds a reference on the channel */
+ if (atomic_long_add_unless(&channel_file->f_count,
+ 1, INT_MAX) == INT_MAX) {
+ ret = -EOVERFLOW;
+ goto refcount_error;
+ }
+ if (event_param->instrumentation == LTTNG_KERNEL_TRACEPOINT
+ || event_param->instrumentation == LTTNG_KERNEL_SYSCALL) {
+ struct lttng_enabler *enabler;
+
+ if (strutils_is_star_glob_pattern(event_param->name)) {
+ /*
+ * If the event name is a star globbing pattern,
+ * we create the special star globbing enabler.
+ */
+ enabler = lttng_enabler_create(LTTNG_ENABLER_STAR_GLOB,
+ event_param, channel);
+ } else {
+ enabler = lttng_enabler_create(LTTNG_ENABLER_NAME,
+ event_param, channel);
}
+ priv = enabler;
+ } else {
+ struct lttng_event *event;
+
/*
* We tolerate no failure path after event creation. It
* will stay invariant for the rest of the session.
*/
- event = lttng_event_create(channel, event_param, NULL, NULL);
- if (!event) {
- ret = -EINVAL;
+ event = lttng_event_create(channel, event_param,
+ NULL, NULL,
+ event_param->instrumentation);
+ WARN_ON_ONCE(!event);
+ if (IS_ERR(event)) {
+ ret = PTR_ERR(event);
goto event_error;
}
- event_file->private_data = event;
- fd_install(event_fd, event_file);
- /* The event holds a reference on the channel */
- atomic_long_inc(&channel_file->f_count);
- break;
- case LTTNG_KERNEL_SYSCALL:
- /*
- * Only all-syscall tracing supported for now.
- */
- if (event_param->name[0] != '\0')
- return -EINVAL;
- ret = lttng_syscalls_register(channel, NULL);
- if (ret)
- goto fd_error;
- event_fd = 0;
- break;
+ priv = event;
}
+ event_file->private_data = priv;
+ fd_install(event_fd, event_file);
return event_fd;
event_error:
+ atomic_long_dec(&channel_file->f_count);
+refcount_error:
fput(event_file);
file_error:
put_unused_fd(event_fd);
case LTTNG_KERNEL_OLD_DISABLE:
case LTTNG_KERNEL_DISABLE:
return lttng_channel_disable(channel);
+ case LTTNG_KERNEL_SYSCALL_MASK:
+ return lttng_channel_syscall_mask(channel,
+ (struct lttng_kernel_syscall_mask __user *) arg);
default:
return -ENOIOCTLCMD;
}
-
}
/**
struct lttng_channel *channel = file->private_data;
if (channel) {
- lttng_metadata_channel_destroy(channel);
fput(channel->session->file);
+ lttng_metadata_channel_destroy(channel);
}
return 0;
static
long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
- struct lttng_event *event = file->private_data;
+ struct lttng_event *event;
+ struct lttng_enabler *enabler;
+ enum lttng_event_type *evtype = file->private_data;
switch (cmd) {
case LTTNG_KERNEL_OLD_CONTEXT:
{
- struct lttng_kernel_context *ucontext_param;
- struct lttng_kernel_old_context *old_ucontext_param;
- int ret;
-
- ucontext_param = kmalloc(sizeof(struct lttng_kernel_context),
- GFP_KERNEL);
- if (!ucontext_param) {
- ret = -ENOMEM;
- goto old_ctx_end;
- }
- old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_old_context),
- GFP_KERNEL);
- if (!old_ucontext_param) {
- ret = -ENOMEM;
- goto old_ctx_error_free_param;
- }
-
- if (copy_from_user(old_ucontext_param,
- (struct lttng_kernel_old_context __user *) arg,
- sizeof(struct lttng_kernel_old_context))) {
- ret = -EFAULT;
- goto old_ctx_error_free_old_param;
- }
- ucontext_param->ctx = old_ucontext_param->ctx;
- memcpy(ucontext_param->padding, old_ucontext_param->padding,
- sizeof(ucontext_param->padding));
- /* only type that uses the union */
- if (old_ucontext_param->ctx == LTTNG_KERNEL_CONTEXT_PERF_COUNTER) {
- ucontext_param->u.perf_counter.type =
- old_ucontext_param->u.perf_counter.type;
- ucontext_param->u.perf_counter.config =
- old_ucontext_param->u.perf_counter.config;
- memcpy(ucontext_param->u.perf_counter.name,
- old_ucontext_param->u.perf_counter.name,
- sizeof(ucontext_param->u.perf_counter.name));
- }
-
- ret = lttng_abi_add_context(file,
- ucontext_param,
- &event->ctx, event->chan->session);
-
-old_ctx_error_free_old_param:
- kfree(old_ucontext_param);
-old_ctx_error_free_param:
- kfree(ucontext_param);
-old_ctx_end:
- return ret;
+ /* Not implemented */
+ return -ENOSYS;
}
case LTTNG_KERNEL_CONTEXT:
{
- struct lttng_kernel_context ucontext_param;
-
- if (copy_from_user(&ucontext_param,
- (struct lttng_kernel_context __user *) arg,
- sizeof(ucontext_param)))
- return -EFAULT;
- return lttng_abi_add_context(file,
- &ucontext_param,
- &event->ctx, event->chan->session);
+ /* Not implemented */
+ return -ENOSYS;
}
case LTTNG_KERNEL_OLD_ENABLE:
case LTTNG_KERNEL_ENABLE:
- return lttng_event_enable(event);
+ switch (*evtype) {
+ case LTTNG_TYPE_EVENT:
+ event = file->private_data;
+ return lttng_event_enable(event);
+ case LTTNG_TYPE_ENABLER:
+ enabler = file->private_data;
+ return lttng_enabler_enable(enabler);
+ default:
+ WARN_ON_ONCE(1);
+ return -ENOSYS;
+ }
case LTTNG_KERNEL_OLD_DISABLE:
case LTTNG_KERNEL_DISABLE:
- return lttng_event_disable(event);
+ switch (*evtype) {
+ case LTTNG_TYPE_EVENT:
+ event = file->private_data;
+ return lttng_event_disable(event);
+ case LTTNG_TYPE_ENABLER:
+ enabler = file->private_data;
+ return lttng_enabler_disable(enabler);
+ default:
+ WARN_ON_ONCE(1);
+ return -ENOSYS;
+ }
+ case LTTNG_KERNEL_FILTER:
+ switch (*evtype) {
+ case LTTNG_TYPE_EVENT:
+ return -EINVAL;
+ case LTTNG_TYPE_ENABLER:
+ {
+ enabler = file->private_data;
+ return lttng_enabler_attach_bytecode(enabler,
+ (struct lttng_kernel_filter_bytecode __user *) arg);
+ }
+ default:
+ WARN_ON_ONCE(1);
+ return -ENOSYS;
+ }
+ case LTTNG_KERNEL_ADD_CALLSITE:
+ switch (*evtype) {
+ case LTTNG_TYPE_EVENT:
+ event = file->private_data;
+ return lttng_event_add_callsite(event,
+ (struct lttng_kernel_event_callsite __user *) arg);
+ case LTTNG_TYPE_ENABLER:
+ return -EINVAL;
+ }
default:
return -ENOIOCTLCMD;
}
static
int lttng_event_release(struct inode *inode, struct file *file)
{
- struct lttng_event *event = file->private_data;
+ struct lttng_event *event;
+ struct lttng_enabler *enabler;
+ enum lttng_event_type *evtype = file->private_data;
+
+ if (!evtype)
+ return 0;
+
+ switch (*evtype) {
+ case LTTNG_TYPE_EVENT:
+ event = file->private_data;
+ if (event)
+ fput(event->chan->file);
+ break;
+ case LTTNG_TYPE_ENABLER:
+ enabler = file->private_data;
+ if (enabler)
+ fput(enabler->chan->file);
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ break;
+ }
- if (event)
- fput(event->chan->file);
return 0;
}
#endif
};
+static int put_u64(uint64_t val, unsigned long arg)
+{
+ return put_user(val, (uint64_t __user *) arg);
+}
+
+static long lttng_stream_ring_buffer_ioctl(struct file *filp,
+ unsigned int cmd, unsigned long arg)
+{
+ struct lib_ring_buffer *buf = filp->private_data;
+ struct channel *chan = buf->backend.chan;
+ const struct lib_ring_buffer_config *config = &chan->backend.config;
+ const struct lttng_channel_ops *ops = chan->backend.priv_ops;
+ int ret;
+
+ if (atomic_read(&chan->record_disabled))
+ return -EIO;
+
+ switch (cmd) {
+ case LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN:
+ {
+ uint64_t ts;
+
+ ret = ops->timestamp_begin(config, buf, &ts);
+ if (ret < 0)
+ goto error;
+ return put_u64(ts, arg);
+ }
+ case LTTNG_RING_BUFFER_GET_TIMESTAMP_END:
+ {
+ uint64_t ts;
+
+ ret = ops->timestamp_end(config, buf, &ts);
+ if (ret < 0)
+ goto error;
+ return put_u64(ts, arg);
+ }
+ case LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED:
+ {
+ uint64_t ed;
+
+ ret = ops->events_discarded(config, buf, &ed);
+ if (ret < 0)
+ goto error;
+ return put_u64(ed, arg);
+ }
+ case LTTNG_RING_BUFFER_GET_CONTENT_SIZE:
+ {
+ uint64_t cs;
+
+ ret = ops->content_size(config, buf, &cs);
+ if (ret < 0)
+ goto error;
+ return put_u64(cs, arg);
+ }
+ case LTTNG_RING_BUFFER_GET_PACKET_SIZE:
+ {
+ uint64_t ps;
+
+ ret = ops->packet_size(config, buf, &ps);
+ if (ret < 0)
+ goto error;
+ return put_u64(ps, arg);
+ }
+ case LTTNG_RING_BUFFER_GET_STREAM_ID:
+ {
+ uint64_t si;
+
+ ret = ops->stream_id(config, buf, &si);
+ if (ret < 0)
+ goto error;
+ return put_u64(si, arg);
+ }
+ case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP:
+ {
+ uint64_t ts;
+
+ ret = ops->current_timestamp(config, buf, &ts);
+ if (ret < 0)
+ goto error;
+ return put_u64(ts, arg);
+ }
+ case LTTNG_RING_BUFFER_GET_SEQ_NUM:
+ {
+ uint64_t seq;
+
+ ret = ops->sequence_number(config, buf, &seq);
+ if (ret < 0)
+ goto error;
+ return put_u64(seq, arg);
+ }
+ case LTTNG_RING_BUFFER_INSTANCE_ID:
+ {
+ uint64_t id;
+
+ ret = ops->instance_id(config, buf, &id);
+ if (ret < 0)
+ goto error;
+ return put_u64(id, arg);
+ }
+ default:
+ return lib_ring_buffer_file_operations.unlocked_ioctl(filp,
+ cmd, arg);
+ }
+
+error:
+ return -ENOSYS;
+}
+
+#ifdef CONFIG_COMPAT
+static long lttng_stream_ring_buffer_compat_ioctl(struct file *filp,
+ unsigned int cmd, unsigned long arg)
+{
+ struct lib_ring_buffer *buf = filp->private_data;
+ struct channel *chan = buf->backend.chan;
+ const struct lib_ring_buffer_config *config = &chan->backend.config;
+ const struct lttng_channel_ops *ops = chan->backend.priv_ops;
+ int ret;
+
+ if (atomic_read(&chan->record_disabled))
+ return -EIO;
+
+ switch (cmd) {
+ case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN:
+ {
+ uint64_t ts;
+
+ ret = ops->timestamp_begin(config, buf, &ts);
+ if (ret < 0)
+ goto error;
+ return put_u64(ts, arg);
+ }
+ case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_END:
+ {
+ uint64_t ts;
+
+ ret = ops->timestamp_end(config, buf, &ts);
+ if (ret < 0)
+ goto error;
+ return put_u64(ts, arg);
+ }
+ case LTTNG_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED:
+ {
+ uint64_t ed;
+
+ ret = ops->events_discarded(config, buf, &ed);
+ if (ret < 0)
+ goto error;
+ return put_u64(ed, arg);
+ }
+ case LTTNG_RING_BUFFER_COMPAT_GET_CONTENT_SIZE:
+ {
+ uint64_t cs;
+
+ ret = ops->content_size(config, buf, &cs);
+ if (ret < 0)
+ goto error;
+ return put_u64(cs, arg);
+ }
+ case LTTNG_RING_BUFFER_COMPAT_GET_PACKET_SIZE:
+ {
+ uint64_t ps;
+
+ ret = ops->packet_size(config, buf, &ps);
+ if (ret < 0)
+ goto error;
+ return put_u64(ps, arg);
+ }
+ case LTTNG_RING_BUFFER_COMPAT_GET_STREAM_ID:
+ {
+ uint64_t si;
+
+ ret = ops->stream_id(config, buf, &si);
+ if (ret < 0)
+ goto error;
+ return put_u64(si, arg);
+ }
+ case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP:
+ {
+ uint64_t ts;
+
+ ret = ops->current_timestamp(config, buf, &ts);
+ if (ret < 0)
+ goto error;
+ return put_u64(ts, arg);
+ }
+ case LTTNG_RING_BUFFER_COMPAT_GET_SEQ_NUM:
+ {
+ uint64_t seq;
+
+ ret = ops->sequence_number(config, buf, &seq);
+ if (ret < 0)
+ goto error;
+ return put_u64(seq, arg);
+ }
+ case LTTNG_RING_BUFFER_COMPAT_INSTANCE_ID:
+ {
+ uint64_t id;
+
+ ret = ops->instance_id(config, buf, &id);
+ if (ret < 0)
+ goto error;
+ return put_u64(id, arg);
+ }
+ default:
+ return lib_ring_buffer_file_operations.compat_ioctl(filp,
+ cmd, arg);
+ }
+
+error:
+ return -ENOSYS;
+}
+#endif /* CONFIG_COMPAT */
+
+static void lttng_stream_override_ring_buffer_fops(void)
+{
+ lttng_stream_ring_buffer_file_operations.owner = THIS_MODULE;
+ lttng_stream_ring_buffer_file_operations.open =
+ lib_ring_buffer_file_operations.open;
+ lttng_stream_ring_buffer_file_operations.release =
+ lib_ring_buffer_file_operations.release;
+ lttng_stream_ring_buffer_file_operations.poll =
+ lib_ring_buffer_file_operations.poll;
+ lttng_stream_ring_buffer_file_operations.splice_read =
+ lib_ring_buffer_file_operations.splice_read;
+ lttng_stream_ring_buffer_file_operations.mmap =
+ lib_ring_buffer_file_operations.mmap;
+ lttng_stream_ring_buffer_file_operations.unlocked_ioctl =
+ lttng_stream_ring_buffer_ioctl;
+ lttng_stream_ring_buffer_file_operations.llseek =
+ lib_ring_buffer_file_operations.llseek;
+#ifdef CONFIG_COMPAT
+ lttng_stream_ring_buffer_file_operations.compat_ioctl =
+ lttng_stream_ring_buffer_compat_ioctl;
+#endif
+}
+
int __init lttng_abi_init(void)
{
int ret = 0;
wrapper_vmalloc_sync_all();
+ lttng_clock_ref();
+
+ ret = lttng_tp_mempool_init();
+ if (ret) {
+ goto error;
+ }
+
lttng_proc_dentry = proc_create_data("lttng", S_IRUSR | S_IWUSR, NULL,
<tng_fops, NULL);
-
+
if (!lttng_proc_dentry) {
printk(KERN_ERR "Error creating LTTng control file\n");
ret = -ENOMEM;
goto error;
}
+ lttng_stream_override_ring_buffer_fops();
+ return 0;
+
error:
+ lttng_tp_mempool_destroy();
+ lttng_clock_unref();
return ret;
}
-void __exit lttng_abi_exit(void)
+/* No __exit annotation because used by init error path too. */
+void lttng_abi_exit(void)
{
+ lttng_tp_mempool_destroy();
+ lttng_clock_unref();
if (lttng_proc_dentry)
remove_proc_entry("lttng", NULL);
}
projects / lttng-modules.git / blobdiff