-/*
- * lttng-abi.c
+/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
*
- * Copyright 2010-2011 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * lttng-abi.c
*
* LTTng ABI
*
+ * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
* Mimic system calls for:
* - session creation, returns a file descriptor or failure.
* - channel creation, returns a file descriptor or failure.
* - Takes an instrumentation source as parameter
* - e.g. tracepoints, dynamic_probes...
* - Takes instrumentation source specific arguments.
- *
- * Dual LGPL v2.1/GPL v2 license.
*/
#include <linux/module.h>
#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/poll.h"
-#include "lttng-abi.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,
* so it can only exit when all file descriptors are closed.
*/
-enum channel_type {
- PER_CPU_CHANNEL,
- METADATA_CHANNEL,
-};
-
static
int lttng_abi_create_session(void)
{
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
-long lttng_abi_tracer_version(struct file *file,
- struct lttng_kernel_tracer_version __user *uversion_param)
+void lttng_abi_tracer_version(struct lttng_kernel_tracer_version *v)
{
- struct lttng_kernel_tracer_version v;
-
- v.major = LTTNG_MODULES_MAJOR_VERSION;
- v.minor = LTTNG_MODULES_MINOR_VERSION;
- v.patchlevel = LTTNG_MODULES_PATCHLEVEL_VERSION;
+ v->major = LTTNG_MODULES_MAJOR_VERSION;
+ v->minor = LTTNG_MODULES_MINOR_VERSION;
+ v->patchlevel = LTTNG_MODULES_PATCHLEVEL_VERSION;
+}
- if (copy_to_user(uversion_param, &v, sizeof(v)))
- return -EFAULT;
- return 0;
+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 __user *ucontext_param,
+ struct lttng_kernel_context *context_param,
struct lttng_ctx **ctx, struct lttng_session *session)
{
- struct lttng_kernel_context context_param;
if (session->been_active)
return -EPERM;
- if (copy_from_user(&context_param, ucontext_param, sizeof(context_param)))
- return -EFAULT;
-
- switch (context_param.ctx) {
+ switch (context_param->ctx) {
case LTTNG_KERNEL_CONTEXT_PID:
return lttng_add_pid_to_ctx(ctx);
case LTTNG_KERNEL_CONTEXT_PRIO:
case LTTNG_KERNEL_CONTEXT_VPPID:
return lttng_add_vppid_to_ctx(ctx);
case LTTNG_KERNEL_CONTEXT_PERF_COUNTER:
- context_param.u.perf_counter.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
- return lttng_add_perf_counter_to_ctx(context_param.u.perf_counter.type,
- context_param.u.perf_counter.config,
- context_param.u.perf_counter.name,
+ context_param->u.perf_counter.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
+ return lttng_add_perf_counter_to_ctx(context_param->u.perf_counter.type,
+ context_param->u.perf_counter.config,
+ context_param->u.perf_counter.name,
ctx);
case LTTNG_KERNEL_CONTEXT_PROCNAME:
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.
*/
long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
switch (cmd) {
+ case LTTNG_KERNEL_OLD_SESSION:
case LTTNG_KERNEL_SESSION:
return lttng_abi_create_session();
+ case LTTNG_KERNEL_OLD_TRACER_VERSION:
+ {
+ struct lttng_kernel_tracer_version v;
+ struct lttng_kernel_old_tracer_version oldv;
+ struct lttng_kernel_old_tracer_version *uversion =
+ (struct lttng_kernel_old_tracer_version __user *) arg;
+
+ lttng_abi_tracer_version(&v);
+ oldv.major = v.major;
+ oldv.minor = v.minor;
+ oldv.patchlevel = v.patchlevel;
+
+ if (copy_to_user(uversion, &oldv, sizeof(oldv)))
+ return -EFAULT;
+ return 0;
+ }
case LTTNG_KERNEL_TRACER_VERSION:
- return lttng_abi_tracer_version(file,
- (struct lttng_kernel_tracer_version __user *) arg);
+ {
+ struct lttng_kernel_tracer_version version;
+ struct lttng_kernel_tracer_version *uversion =
+ (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();
return 0;
+ case LTTNG_KERNEL_OLD_CALIBRATE:
+ {
+ struct lttng_kernel_old_calibrate __user *ucalibrate =
+ (struct lttng_kernel_old_calibrate __user *) arg;
+ struct lttng_kernel_old_calibrate old_calibrate;
+ struct lttng_kernel_calibrate calibrate;
+ int ret;
+
+ if (copy_from_user(&old_calibrate, ucalibrate, sizeof(old_calibrate)))
+ return -EFAULT;
+ calibrate.type = old_calibrate.type;
+ ret = lttng_calibrate(&calibrate);
+ if (copy_to_user(ucalibrate, &old_calibrate, sizeof(old_calibrate)))
+ return -EFAULT;
+ return ret;
+ }
case LTTNG_KERNEL_CALIBRATE:
{
struct lttng_kernel_calibrate __user *ucalibrate =
#endif
};
-/*
- * We tolerate no failure in this function (if one happens, we print a dmesg
- * error, but cannot return any error, because the channel information is
- * invariant.
- */
-static
-void lttng_metadata_create_events(struct file *channel_file)
-{
- struct lttng_channel *channel = channel_file->private_data;
- static struct lttng_kernel_event metadata_params = {
- .instrumentation = LTTNG_KERNEL_TRACEPOINT,
- .name = "lttng_metadata",
- };
- 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, &metadata_params, NULL, NULL);
- if (!event) {
- goto create_error;
- }
- return;
-
-create_error:
- WARN_ON(1);
- return; /* not allowed to return error */
-}
-
static
int lttng_abi_create_channel(struct file *session_file,
- struct lttng_kernel_channel __user *uchan_param,
+ struct lttng_kernel_channel *chan_param,
enum channel_type channel_type)
{
struct lttng_session *session = session_file->private_data;
const char *transport_name;
struct lttng_channel *chan;
struct file *chan_file;
- struct lttng_kernel_channel chan_param;
int chan_fd;
int ret = 0;
- if (copy_from_user(&chan_param, uchan_param, sizeof(chan_param)))
- return -EFAULT;
- 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);
}
switch (channel_type) {
case PER_CPU_CHANNEL:
- if (chan_param.output == LTTNG_KERNEL_SPLICE) {
- transport_name = chan_param.overwrite ?
+ if (chan_param->output == LTTNG_KERNEL_SPLICE) {
+ transport_name = chan_param->overwrite ?
"relay-overwrite" : "relay-discard";
- } else if (chan_param.output == LTTNG_KERNEL_MMAP) {
- transport_name = chan_param.overwrite ?
+ } else if (chan_param->output == LTTNG_KERNEL_MMAP) {
+ transport_name = chan_param->overwrite ?
"relay-overwrite-mmap" : "relay-discard-mmap";
} else {
return -EINVAL;
}
break;
case METADATA_CHANNEL:
- if (chan_param.output == LTTNG_KERNEL_SPLICE)
+ if (chan_param->output == LTTNG_KERNEL_SPLICE)
transport_name = "relay-metadata";
- else if (chan_param.output == LTTNG_KERNEL_MMAP)
+ else if (chan_param->output == LTTNG_KERNEL_MMAP)
transport_name = "relay-metadata-mmap";
else
return -EINVAL;
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 = lttng_channel_create(session, transport_name, NULL,
- chan_param.subbuf_size,
- chan_param.num_subbuf,
- chan_param.switch_timer_interval,
- chan_param.read_timer_interval);
+ chan_param->subbuf_size,
+ chan_param->num_subbuf,
+ chan_param->switch_timer_interval,
+ chan_param->read_timer_interval,
+ channel_type);
if (!chan) {
ret = -EINVAL;
goto chan_error;
chan->file = chan_file;
chan_file->private_data = chan;
fd_install(chan_fd, chan_file);
- if (channel_type == METADATA_CHANNEL) {
- session->metadata = chan;
- lttng_metadata_create_events(chan_file);
- }
-
- /* The channel created holds a reference on the session */
- 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.
*/
struct lttng_session *session = file->private_data;
switch (cmd) {
+ case LTTNG_KERNEL_OLD_CHANNEL:
+ {
+ struct lttng_kernel_channel chan_param;
+ struct lttng_kernel_old_channel old_chan_param;
+
+ if (copy_from_user(&old_chan_param,
+ (struct lttng_kernel_old_channel __user *) arg,
+ sizeof(struct lttng_kernel_old_channel)))
+ return -EFAULT;
+ chan_param.overwrite = old_chan_param.overwrite;
+ chan_param.subbuf_size = old_chan_param.subbuf_size;
+ chan_param.num_subbuf = old_chan_param.num_subbuf;
+ chan_param.switch_timer_interval = old_chan_param.switch_timer_interval;
+ chan_param.read_timer_interval = old_chan_param.read_timer_interval;
+ chan_param.output = old_chan_param.output;
+
+ return lttng_abi_create_channel(file, &chan_param,
+ PER_CPU_CHANNEL);
+ }
case LTTNG_KERNEL_CHANNEL:
- return lttng_abi_create_channel(file,
+ {
+ struct lttng_kernel_channel chan_param;
+
+ if (copy_from_user(&chan_param,
(struct lttng_kernel_channel __user *) arg,
+ sizeof(struct lttng_kernel_channel)))
+ return -EFAULT;
+ return lttng_abi_create_channel(file, &chan_param,
PER_CPU_CHANNEL);
+ }
+ case LTTNG_KERNEL_OLD_SESSION_START:
+ case LTTNG_KERNEL_OLD_ENABLE:
case LTTNG_KERNEL_SESSION_START:
case LTTNG_KERNEL_ENABLE:
return lttng_session_enable(session);
+ case LTTNG_KERNEL_OLD_SESSION_STOP:
+ case LTTNG_KERNEL_OLD_DISABLE:
case LTTNG_KERNEL_SESSION_STOP:
case LTTNG_KERNEL_DISABLE:
return lttng_session_disable(session);
+ case LTTNG_KERNEL_OLD_METADATA:
+ {
+ struct lttng_kernel_channel chan_param;
+ struct lttng_kernel_old_channel old_chan_param;
+
+ if (copy_from_user(&old_chan_param,
+ (struct lttng_kernel_old_channel __user *) arg,
+ sizeof(struct lttng_kernel_old_channel)))
+ return -EFAULT;
+ chan_param.overwrite = old_chan_param.overwrite;
+ chan_param.subbuf_size = old_chan_param.subbuf_size;
+ chan_param.num_subbuf = old_chan_param.num_subbuf;
+ chan_param.switch_timer_interval = old_chan_param.switch_timer_interval;
+ chan_param.read_timer_interval = old_chan_param.read_timer_interval;
+ chan_param.output = old_chan_param.output;
+
+ return lttng_abi_create_channel(file, &chan_param,
+ METADATA_CHANNEL);
+ }
case LTTNG_KERNEL_METADATA:
- return lttng_abi_create_channel(file,
- (struct lttng_kernel_channel __user *) arg,
+ {
+ struct lttng_kernel_channel chan_param;
+
+ if (copy_from_user(&chan_param,
+ (struct lttng_kernel_channel __user *) arg,
+ sizeof(struct lttng_kernel_channel)))
+ return -EFAULT;
+ 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;
}
#endif
};
+/**
+ * lttng_metadata_ring_buffer_poll - LTTng ring buffer poll file operation
+ * @filp: the file
+ * @wait: poll table
+ *
+ * Handles the poll operations for the metadata channels.
+ */
static
-int lttng_abi_open_stream(struct file *channel_file)
+unsigned int lttng_metadata_ring_buffer_poll(struct file *filp,
+ poll_table *wait)
+{
+ struct lttng_metadata_stream *stream = filp->private_data;
+ struct lib_ring_buffer *buf = stream->priv;
+ int finalized;
+ unsigned int mask = 0;
+
+ if (filp->f_mode & FMODE_READ) {
+ poll_wait_set_exclusive(wait);
+ poll_wait(filp, &stream->read_wait, wait);
+
+ finalized = stream->finalized;
+
+ /*
+ * lib_ring_buffer_is_finalized() contains a smp_rmb()
+ * ordering finalized load before offsets loads.
+ */
+ WARN_ON(atomic_long_read(&buf->active_readers) != 1);
+
+ if (finalized)
+ mask |= POLLHUP;
+
+ mutex_lock(&stream->metadata_cache->lock);
+ if (stream->metadata_cache->metadata_written >
+ stream->metadata_out)
+ mask |= POLLIN;
+ mutex_unlock(&stream->metadata_cache->lock);
+ }
+
+ return mask;
+}
+
+static
+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;
+
+ 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;
+
+ 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;
+}
+
+static
+long lttng_metadata_ring_buffer_ioctl(struct file *filp,
+ unsigned int cmd, unsigned long arg)
+{
+ int ret;
+ struct lttng_metadata_stream *stream = filp->private_data;
+ struct lib_ring_buffer *buf = stream->priv;
+
+ switch (cmd) {
+ case RING_BUFFER_GET_NEXT_SUBBUF:
+ {
+ 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. */
+ 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;
+}
+
+#ifdef CONFIG_COMPAT
+static
+long lttng_metadata_ring_buffer_compat_ioctl(struct file *filp,
+ unsigned int cmd, unsigned long arg)
+{
+ int ret;
+ struct lttng_metadata_stream *stream = filp->private_data;
+ struct lib_ring_buffer *buf = stream->priv;
+
+ switch (cmd) {
+ case RING_BUFFER_GET_NEXT_SUBBUF:
+ {
+ 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. */
+ 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 lttng_metadata_stream *stream = inode->i_private;
+ 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);
+}
+
+static
+int lttng_metadata_ring_buffer_release(struct inode *inode, struct file *file)
+{
+ struct lttng_metadata_stream *stream = file->private_data;
+ 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);
+}
+
+static
+ssize_t lttng_metadata_ring_buffer_splice_read(struct file *in, loff_t *ppos,
+ struct pipe_inode_info *pipe, size_t len,
+ unsigned int flags)
+{
+ struct lttng_metadata_stream *stream = in->private_data;
+ struct lib_ring_buffer *buf = stream->priv;
+
+ return lib_ring_buffer_splice_read(in, ppos, pipe, len,
+ flags, buf);
+}
+
+static
+int lttng_metadata_ring_buffer_mmap(struct file *filp,
+ struct vm_area_struct *vma)
+{
+ struct lttng_metadata_stream *stream = filp->private_data;
+ struct lib_ring_buffer *buf = stream->priv;
+
+ return lib_ring_buffer_mmap(filp, vma, buf);
+}
+
+static
+const struct file_operations lttng_metadata_ring_buffer_file_operations = {
+ .owner = THIS_MODULE,
+ .open = lttng_metadata_ring_buffer_open,
+ .release = lttng_metadata_ring_buffer_release,
+ .poll = lttng_metadata_ring_buffer_poll,
+ .splice_read = lttng_metadata_ring_buffer_splice_read,
+ .mmap = lttng_metadata_ring_buffer_mmap,
+ .unlocked_ioctl = lttng_metadata_ring_buffer_ioctl,
+ .llseek = vfs_lib_ring_buffer_no_llseek,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = lttng_metadata_ring_buffer_compat_ioctl,
+#endif
+};
+
+static
+int lttng_abi_create_stream_fd(struct file *channel_file, void *stream_priv,
+ const struct file_operations *fops)
{
- struct lttng_channel *channel = channel_file->private_data;
- struct lib_ring_buffer *buf;
int stream_fd, ret;
struct file *stream_file;
- buf = channel->ops->buffer_read_open(channel->chan);
- if (!buf)
- return -ENOENT;
-
- stream_fd = get_unused_fd();
+ stream_fd = lttng_get_unused_fd();
if (stream_fd < 0) {
ret = stream_fd;
goto fd_error;
}
- stream_file = anon_inode_getfile("[lttng_stream]",
- &lib_ring_buffer_file_operations,
- buf, O_RDWR);
+ stream_file = anon_inode_getfile("[lttng_stream]", fops,
+ stream_priv, O_RDWR);
if (IS_ERR(stream_file)) {
ret = PTR_ERR(stream_file);
goto file_error;
file_error:
put_unused_fd(stream_fd);
+fd_error:
+ return ret;
+}
+
+static
+int lttng_abi_open_stream(struct file *channel_file)
+{
+ struct lttng_channel *channel = channel_file->private_data;
+ struct lib_ring_buffer *buf;
+ int ret;
+ void *stream_priv;
+
+ buf = channel->ops->buffer_read_open(channel->chan);
+ if (!buf)
+ return -ENOENT;
+
+ stream_priv = buf;
+ ret = lttng_abi_create_stream_fd(channel_file, stream_priv,
+ <tng_stream_ring_buffer_file_operations);
+ if (ret < 0)
+ goto fd_error;
+
+ return ret;
+
fd_error:
channel->ops->buffer_read_close(buf);
return ret;
}
+static
+int lttng_abi_open_metadata_stream(struct file *channel_file)
+{
+ struct lttng_channel *channel = channel_file->private_data;
+ struct lttng_session *session = channel->session;
+ struct lib_ring_buffer *buf;
+ int ret;
+ struct lttng_metadata_stream *metadata_stream;
+ void *stream_priv;
+
+ buf = channel->ops->buffer_read_open(channel->chan);
+ if (!buf)
+ return -ENOENT;
+
+ metadata_stream = kzalloc(sizeof(struct lttng_metadata_stream),
+ GFP_KERNEL);
+ 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;
+
+ 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;
+}
+
static
int lttng_abi_create_event(struct file *channel_file,
- struct lttng_kernel_event __user *uevent_param)
+ struct lttng_kernel_event *event_param)
{
struct lttng_channel *channel = channel_file->private_data;
- struct lttng_event *event;
- struct lttng_kernel_event event_param;
int event_fd, ret;
struct file *event_file;
+ void *priv;
- if (copy_from_user(&event_param, uevent_param, sizeof(event_param)))
- return -EFAULT;
- event_param.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
- switch (event_param.instrumentation) {
+ event_param->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
+ switch (event_param->instrumentation) {
case LTTNG_KERNEL_KRETPROBE:
- event_param.u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
+ event_param->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
break;
case LTTNG_KERNEL_KPROBE:
- event_param.u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
+ event_param->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
break;
case LTTNG_KERNEL_FUNCTION:
- event_param.u.ftrace.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
+ event_param->u.ftrace.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
break;
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);
struct lttng_channel *channel = file->private_data;
switch (cmd) {
+ case LTTNG_KERNEL_OLD_STREAM:
case LTTNG_KERNEL_STREAM:
return lttng_abi_open_stream(file);
+ case LTTNG_KERNEL_OLD_EVENT:
+ {
+ struct lttng_kernel_event *uevent_param;
+ struct lttng_kernel_old_event *old_uevent_param;
+ int ret;
+
+ uevent_param = kmalloc(sizeof(struct lttng_kernel_event),
+ GFP_KERNEL);
+ if (!uevent_param) {
+ ret = -ENOMEM;
+ goto old_event_end;
+ }
+ old_uevent_param = kmalloc(
+ sizeof(struct lttng_kernel_old_event),
+ GFP_KERNEL);
+ if (!old_uevent_param) {
+ ret = -ENOMEM;
+ goto old_event_error_free_param;
+ }
+ if (copy_from_user(old_uevent_param,
+ (struct lttng_kernel_old_event __user *) arg,
+ sizeof(struct lttng_kernel_old_event))) {
+ ret = -EFAULT;
+ goto old_event_error_free_old_param;
+ }
+
+ memcpy(uevent_param->name, old_uevent_param->name,
+ sizeof(uevent_param->name));
+ uevent_param->instrumentation =
+ old_uevent_param->instrumentation;
+
+ switch (old_uevent_param->instrumentation) {
+ case LTTNG_KERNEL_KPROBE:
+ uevent_param->u.kprobe.addr =
+ old_uevent_param->u.kprobe.addr;
+ uevent_param->u.kprobe.offset =
+ old_uevent_param->u.kprobe.offset;
+ memcpy(uevent_param->u.kprobe.symbol_name,
+ old_uevent_param->u.kprobe.symbol_name,
+ sizeof(uevent_param->u.kprobe.symbol_name));
+ break;
+ case LTTNG_KERNEL_KRETPROBE:
+ uevent_param->u.kretprobe.addr =
+ old_uevent_param->u.kretprobe.addr;
+ uevent_param->u.kretprobe.offset =
+ old_uevent_param->u.kretprobe.offset;
+ memcpy(uevent_param->u.kretprobe.symbol_name,
+ old_uevent_param->u.kretprobe.symbol_name,
+ sizeof(uevent_param->u.kretprobe.symbol_name));
+ break;
+ case LTTNG_KERNEL_FUNCTION:
+ memcpy(uevent_param->u.ftrace.symbol_name,
+ old_uevent_param->u.ftrace.symbol_name,
+ sizeof(uevent_param->u.ftrace.symbol_name));
+ break;
+ default:
+ break;
+ }
+ ret = lttng_abi_create_event(file, uevent_param);
+
+old_event_error_free_old_param:
+ kfree(old_uevent_param);
+old_event_error_free_param:
+ kfree(uevent_param);
+old_event_end:
+ return ret;
+ }
case LTTNG_KERNEL_EVENT:
- return lttng_abi_create_event(file, (struct lttng_kernel_event __user *) arg);
+ {
+ struct lttng_kernel_event uevent_param;
+
+ if (copy_from_user(&uevent_param,
+ (struct lttng_kernel_event __user *) arg,
+ sizeof(uevent_param)))
+ return -EFAULT;
+ return lttng_abi_create_event(file, &uevent_param);
+ }
+ 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,
+ &channel->ctx, channel->session);
+
+old_ctx_error_free_old_param:
+ kfree(old_ucontext_param);
+old_ctx_error_free_param:
+ kfree(ucontext_param);
+old_ctx_end:
+ return ret;
+ }
case LTTNG_KERNEL_CONTEXT:
- return lttng_abi_add_context(file,
+ {
+ 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,
&channel->ctx, channel->session);
+ }
+ case LTTNG_KERNEL_OLD_ENABLE:
case LTTNG_KERNEL_ENABLE:
return lttng_channel_enable(channel);
+ 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;
}
long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
switch (cmd) {
+ case LTTNG_KERNEL_OLD_STREAM:
case LTTNG_KERNEL_STREAM:
- return lttng_abi_open_stream(file);
+ return lttng_abi_open_metadata_stream(file);
default:
return -ENOIOCTLCMD;
}
return 0;
}
+static
+int lttng_metadata_channel_release(struct inode *inode, struct file *file)
+{
+ struct lttng_channel *channel = file->private_data;
+
+ if (channel) {
+ fput(channel->session->file);
+ lttng_metadata_channel_destroy(channel);
+ }
+
+ return 0;
+}
+
static const struct file_operations lttng_channel_fops = {
.owner = THIS_MODULE,
.release = lttng_channel_release,
static const struct file_operations lttng_metadata_fops = {
.owner = THIS_MODULE,
- .release = lttng_channel_release,
+ .release = lttng_metadata_channel_release,
.unlocked_ioctl = lttng_metadata_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = lttng_metadata_ioctl,
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:
+ {
+ /* Not implemented */
+ return -ENOSYS;
+ }
case LTTNG_KERNEL_CONTEXT:
- return lttng_abi_add_context(file,
- (struct lttng_kernel_context __user *) arg,
- &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