* - Takes instrumentation source specific arguments.
*/
+#include <asm/barrier.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/anon_inodes.h>
#include <ringbuffer/vfs.h>
#include <ringbuffer/backend.h>
#include <ringbuffer/frontend.h>
+#include <wrapper/compiler_attributes.h>
#include <wrapper/poll.h>
-#include <wrapper/file.h>
#include <wrapper/kref.h>
+#include <wrapper/uaccess.h>
#include <lttng/string-utils.h>
#include <lttng/abi.h>
#include <lttng/abi-old.h>
#include <lttng/events.h>
+#include <lttng/events-internal.h>
#include <lttng/tracer.h>
#include <lttng/tp-mempool.h>
#include <ringbuffer/frontend_types.h>
+#include <ringbuffer/iterator.h>
/*
* This is LTTng's own personal way to create a system call as an external
static struct proc_dir_entry *lttng_proc_dentry;
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0))
+#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0))
static const struct proc_ops lttng_proc_ops;
#else
static const struct file_operations lttng_proc_ops;
#endif
static const struct file_operations lttng_session_fops;
+static const struct file_operations lttng_event_notifier_group_fops;
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 const struct file_operations lttng_event_session_fops;
+static const struct file_operations lttng_event_session_enabler_fops;
static struct file_operations lttng_stream_ring_buffer_file_operations;
static int put_u64(uint64_t val, unsigned long arg);
+static int put_u32(uint32_t val, unsigned long arg);
+
+static
+int lttng_abi_create_event_counter_enabler(struct file *channel_file,
+ struct lttng_kernel_counter_event *counter_event);
+static
+long lttng_abi_session_create_counter(
+ struct lttng_kernel_session *session,
+ const struct lttng_kernel_counter_conf *counter_conf);
+
+static int validate_zeroed_padding(char *p, size_t len)
+{
+ size_t i;
+
+ for (i = 0; i < len; i++) {
+ if (p[i])
+ return -1;
+ }
+ return 0;
+}
/*
* Teardown management: opened file descriptors keep a refcount on the module,
static
int lttng_abi_create_session(void)
{
- struct lttng_session *session;
+ struct lttng_kernel_session *session;
struct file *session_file;
int session_fd, ret;
session = lttng_session_create();
if (!session)
return -ENOMEM;
- session_fd = lttng_get_unused_fd();
+ session_fd = get_unused_fd_flags(0);
if (session_fd < 0) {
ret = session_fd;
goto fd_error;
ret = PTR_ERR(session_file);
goto file_error;
}
- session->file = session_file;
+ session->priv->file = session_file;
fd_install(session_fd, session_file);
return session_fd;
return ret;
}
+static
+void event_notifier_send_notification_work_wakeup(struct irq_work *entry)
+{
+ struct lttng_event_notifier_group *event_notifier_group =
+ container_of(entry, struct lttng_event_notifier_group,
+ wakeup_pending);
+ wake_up_interruptible(&event_notifier_group->read_wait);
+}
+
+static
+int lttng_abi_create_event_notifier_group(void)
+{
+ struct lttng_event_notifier_group *event_notifier_group;
+ struct file *event_notifier_group_file;
+ int event_notifier_group_fd, ret;
+
+ event_notifier_group = lttng_event_notifier_group_create();
+ if (!event_notifier_group)
+ return -ENOMEM;
+
+ event_notifier_group_fd = get_unused_fd_flags(0);
+ if (event_notifier_group_fd < 0) {
+ ret = event_notifier_group_fd;
+ goto fd_error;
+ }
+ event_notifier_group_file = anon_inode_getfile("[lttng_event_notifier_group]",
+ <tng_event_notifier_group_fops,
+ event_notifier_group, O_RDWR);
+ if (IS_ERR(event_notifier_group_file)) {
+ ret = PTR_ERR(event_notifier_group_file);
+ goto file_error;
+ }
+
+ event_notifier_group->file = event_notifier_group_file;
+ init_waitqueue_head(&event_notifier_group->read_wait);
+ init_irq_work(&event_notifier_group->wakeup_pending,
+ event_notifier_send_notification_work_wakeup);
+ fd_install(event_notifier_group_fd, event_notifier_group_file);
+ return event_notifier_group_fd;
+
+file_error:
+ put_unused_fd(event_notifier_group_fd);
+fd_error:
+ lttng_event_notifier_group_destroy(event_notifier_group);
+ return ret;
+}
+
static
int lttng_abi_tracepoint_list(void)
{
struct file *tracepoint_list_file;
int file_fd, ret;
- file_fd = lttng_get_unused_fd();
+ file_fd = get_unused_fd_flags(0);
if (file_fd < 0) {
ret = file_fd;
goto fd_error;
struct file *syscall_list_file;
int file_fd, ret;
- file_fd = lttng_get_unused_fd();
+ file_fd = get_unused_fd_flags(0);
if (file_fd < 0) {
ret = file_fd;
goto fd_error;
#endif
static
-void lttng_abi_tracer_version(struct lttng_kernel_tracer_version *v)
+void lttng_abi_tracer_version(struct lttng_kernel_abi_tracer_version *v)
{
v->major = LTTNG_MODULES_MAJOR_VERSION;
v->minor = LTTNG_MODULES_MINOR_VERSION;
}
static
-void lttng_abi_tracer_abi_version(struct lttng_kernel_tracer_abi_version *v)
+void lttng_abi_tracer_abi_version(struct lttng_kernel_abi_tracer_abi_version *v)
{
- v->major = LTTNG_MODULES_ABI_MAJOR_VERSION;
- v->minor = LTTNG_MODULES_ABI_MINOR_VERSION;
+ v->major = LTTNG_KERNEL_ABI_MAJOR_VERSION;
+ v->minor = LTTNG_KERNEL_ABI_MINOR_VERSION;
}
static
long lttng_abi_add_context(struct file *file,
- struct lttng_kernel_context *context_param,
- struct lttng_ctx **ctx, struct lttng_session *session)
+ struct lttng_kernel_abi_context *context_param,
+ struct lttng_kernel_ctx **ctx, struct lttng_kernel_session *session)
{
- if (session->been_active)
+ if (session->priv->been_active)
return -EPERM;
switch (context_param->ctx) {
- case LTTNG_KERNEL_CONTEXT_PID:
+ case LTTNG_KERNEL_ABI_CONTEXT_PID:
return lttng_add_pid_to_ctx(ctx);
- case LTTNG_KERNEL_CONTEXT_PRIO:
+ case LTTNG_KERNEL_ABI_CONTEXT_PRIO:
return lttng_add_prio_to_ctx(ctx);
- case LTTNG_KERNEL_CONTEXT_NICE:
+ case LTTNG_KERNEL_ABI_CONTEXT_NICE:
return lttng_add_nice_to_ctx(ctx);
- case LTTNG_KERNEL_CONTEXT_VPID:
+ case LTTNG_KERNEL_ABI_CONTEXT_VPID:
return lttng_add_vpid_to_ctx(ctx);
- case LTTNG_KERNEL_CONTEXT_TID:
+ case LTTNG_KERNEL_ABI_CONTEXT_TID:
return lttng_add_tid_to_ctx(ctx);
- case LTTNG_KERNEL_CONTEXT_VTID:
+ case LTTNG_KERNEL_ABI_CONTEXT_VTID:
return lttng_add_vtid_to_ctx(ctx);
- case LTTNG_KERNEL_CONTEXT_PPID:
+ case LTTNG_KERNEL_ABI_CONTEXT_PPID:
return lttng_add_ppid_to_ctx(ctx);
- case LTTNG_KERNEL_CONTEXT_VPPID:
+ case LTTNG_KERNEL_ABI_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';
+ case LTTNG_KERNEL_ABI_CONTEXT_PERF_COUNTER:
+ context_param->u.perf_counter.name[LTTNG_KERNEL_ABI_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:
+ case LTTNG_KERNEL_ABI_CONTEXT_PROCNAME:
return lttng_add_procname_to_ctx(ctx);
- case LTTNG_KERNEL_CONTEXT_HOSTNAME:
+ case LTTNG_KERNEL_ABI_CONTEXT_HOSTNAME:
return lttng_add_hostname_to_ctx(ctx);
- case LTTNG_KERNEL_CONTEXT_CPU_ID:
+ case LTTNG_KERNEL_ABI_CONTEXT_CPU_ID:
return lttng_add_cpu_id_to_ctx(ctx);
- case LTTNG_KERNEL_CONTEXT_INTERRUPTIBLE:
+ case LTTNG_KERNEL_ABI_CONTEXT_INTERRUPTIBLE:
return lttng_add_interruptible_to_ctx(ctx);
- case LTTNG_KERNEL_CONTEXT_NEED_RESCHEDULE:
+ case LTTNG_KERNEL_ABI_CONTEXT_NEED_RESCHEDULE:
return lttng_add_need_reschedule_to_ctx(ctx);
- case LTTNG_KERNEL_CONTEXT_PREEMPTIBLE:
+ case LTTNG_KERNEL_ABI_CONTEXT_PREEMPTIBLE:
return lttng_add_preemptible_to_ctx(ctx);
- case LTTNG_KERNEL_CONTEXT_MIGRATABLE:
+ case LTTNG_KERNEL_ABI_CONTEXT_MIGRATABLE:
return lttng_add_migratable_to_ctx(ctx);
- case LTTNG_KERNEL_CONTEXT_CALLSTACK_KERNEL:
- case LTTNG_KERNEL_CONTEXT_CALLSTACK_USER:
+ case LTTNG_KERNEL_ABI_CONTEXT_CALLSTACK_KERNEL:
+ case LTTNG_KERNEL_ABI_CONTEXT_CALLSTACK_USER:
return lttng_add_callstack_to_ctx(ctx, context_param->ctx);
- case LTTNG_KERNEL_CONTEXT_CGROUP_NS:
+ case LTTNG_KERNEL_ABI_CONTEXT_CGROUP_NS:
return lttng_add_cgroup_ns_to_ctx(ctx);
- case LTTNG_KERNEL_CONTEXT_IPC_NS:
+ case LTTNG_KERNEL_ABI_CONTEXT_IPC_NS:
return lttng_add_ipc_ns_to_ctx(ctx);
- case LTTNG_KERNEL_CONTEXT_MNT_NS:
+ case LTTNG_KERNEL_ABI_CONTEXT_MNT_NS:
return lttng_add_mnt_ns_to_ctx(ctx);
- case LTTNG_KERNEL_CONTEXT_NET_NS:
+ case LTTNG_KERNEL_ABI_CONTEXT_NET_NS:
return lttng_add_net_ns_to_ctx(ctx);
- case LTTNG_KERNEL_CONTEXT_PID_NS:
+ case LTTNG_KERNEL_ABI_CONTEXT_PID_NS:
return lttng_add_pid_ns_to_ctx(ctx);
- case LTTNG_KERNEL_CONTEXT_USER_NS:
+ case LTTNG_KERNEL_ABI_CONTEXT_USER_NS:
return lttng_add_user_ns_to_ctx(ctx);
- case LTTNG_KERNEL_CONTEXT_UTS_NS:
+ case LTTNG_KERNEL_ABI_CONTEXT_UTS_NS:
return lttng_add_uts_ns_to_ctx(ctx);
- case LTTNG_KERNEL_CONTEXT_UID:
+ case LTTNG_KERNEL_ABI_CONTEXT_UID:
return lttng_add_uid_to_ctx(ctx);
- case LTTNG_KERNEL_CONTEXT_EUID:
+ case LTTNG_KERNEL_ABI_CONTEXT_EUID:
return lttng_add_euid_to_ctx(ctx);
- case LTTNG_KERNEL_CONTEXT_SUID:
+ case LTTNG_KERNEL_ABI_CONTEXT_SUID:
return lttng_add_suid_to_ctx(ctx);
- case LTTNG_KERNEL_CONTEXT_GID:
+ case LTTNG_KERNEL_ABI_CONTEXT_GID:
return lttng_add_gid_to_ctx(ctx);
- case LTTNG_KERNEL_CONTEXT_EGID:
+ case LTTNG_KERNEL_ABI_CONTEXT_EGID:
return lttng_add_egid_to_ctx(ctx);
- case LTTNG_KERNEL_CONTEXT_SGID:
+ case LTTNG_KERNEL_ABI_CONTEXT_SGID:
return lttng_add_sgid_to_ctx(ctx);
- case LTTNG_KERNEL_CONTEXT_VUID:
+ case LTTNG_KERNEL_ABI_CONTEXT_VUID:
return lttng_add_vuid_to_ctx(ctx);
- case LTTNG_KERNEL_CONTEXT_VEUID:
+ case LTTNG_KERNEL_ABI_CONTEXT_VEUID:
return lttng_add_veuid_to_ctx(ctx);
- case LTTNG_KERNEL_CONTEXT_VSUID:
+ case LTTNG_KERNEL_ABI_CONTEXT_VSUID:
return lttng_add_vsuid_to_ctx(ctx);
- case LTTNG_KERNEL_CONTEXT_VGID:
+ case LTTNG_KERNEL_ABI_CONTEXT_VGID:
return lttng_add_vgid_to_ctx(ctx);
- case LTTNG_KERNEL_CONTEXT_VEGID:
+ case LTTNG_KERNEL_ABI_CONTEXT_VEGID:
return lttng_add_vegid_to_ctx(ctx);
- case LTTNG_KERNEL_CONTEXT_VSGID:
+ case LTTNG_KERNEL_ABI_CONTEXT_VSGID:
return lttng_add_vsgid_to_ctx(ctx);
+ case LTTNG_KERNEL_ABI_CONTEXT_TIME_NS:
+ return lttng_add_time_ns_to_ctx(ctx);
default:
return -EINVAL;
}
* @arg: command arg
*
* This ioctl implements lttng commands:
- * LTTNG_KERNEL_SESSION
+ * LTTNG_KERNEL_ABI_SESSION
* Returns a LTTng trace session file descriptor
- * LTTNG_KERNEL_TRACER_VERSION
+ * LTTNG_KERNEL_ABI_TRACER_VERSION
* Returns the LTTng kernel tracer version
- * LTTNG_KERNEL_TRACEPOINT_LIST
+ * LTTNG_KERNEL_ABI_TRACEPOINT_LIST
* Returns a file descriptor listing available tracepoints
- * LTTNG_KERNEL_WAIT_QUIESCENT
+ * LTTNG_KERNEL_ABI_WAIT_QUIESCENT
* Returns after all previously running probes have completed
- * LTTNG_KERNEL_TRACER_ABI_VERSION
+ * LTTNG_KERNEL_ABI_TRACER_ABI_VERSION
* Returns the LTTng kernel tracer ABI version
+ * LTTNG_KERNEL_ABI_EVENT_NOTIFIER_GROUP_CREATE
+ * Returns a LTTng event notifier group file descriptor
*
* 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:
+ case LTTNG_KERNEL_ABI_OLD_SESSION:
+ case LTTNG_KERNEL_ABI_SESSION:
return lttng_abi_create_session();
- case LTTNG_KERNEL_OLD_TRACER_VERSION:
+ case LTTNG_KERNEL_ABI_EVENT_NOTIFIER_GROUP_CREATE:
+ return lttng_abi_create_event_notifier_group();
+ case LTTNG_KERNEL_ABI_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;
+ struct lttng_kernel_abi_tracer_version v;
+ struct lttng_kernel_abi_old_tracer_version oldv;
+ struct lttng_kernel_abi_old_tracer_version *uversion =
+ (struct lttng_kernel_abi_old_tracer_version __user *) arg;
lttng_abi_tracer_version(&v);
oldv.major = v.major;
return -EFAULT;
return 0;
}
- case LTTNG_KERNEL_TRACER_VERSION:
+ case LTTNG_KERNEL_ABI_TRACER_VERSION:
{
- struct lttng_kernel_tracer_version version;
- struct lttng_kernel_tracer_version *uversion =
- (struct lttng_kernel_tracer_version __user *) arg;
+ struct lttng_kernel_abi_tracer_version version;
+ struct lttng_kernel_abi_tracer_version *uversion =
+ (struct lttng_kernel_abi_tracer_version __user *) arg;
lttng_abi_tracer_version(&version);
return -EFAULT;
return 0;
}
- case LTTNG_KERNEL_TRACER_ABI_VERSION:
+ case LTTNG_KERNEL_ABI_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;
+ struct lttng_kernel_abi_tracer_abi_version version;
+ struct lttng_kernel_abi_tracer_abi_version *uversion =
+ (struct lttng_kernel_abi_tracer_abi_version __user *) arg;
lttng_abi_tracer_abi_version(&version);
return -EFAULT;
return 0;
}
- case LTTNG_KERNEL_OLD_TRACEPOINT_LIST:
- case LTTNG_KERNEL_TRACEPOINT_LIST:
+ case LTTNG_KERNEL_ABI_OLD_TRACEPOINT_LIST:
+ case LTTNG_KERNEL_ABI_TRACEPOINT_LIST:
return lttng_abi_tracepoint_list();
- case LTTNG_KERNEL_SYSCALL_LIST:
+ case LTTNG_KERNEL_ABI_SYSCALL_LIST:
return lttng_abi_syscall_list();
- case LTTNG_KERNEL_OLD_WAIT_QUIESCENT:
- case LTTNG_KERNEL_WAIT_QUIESCENT:
+ case LTTNG_KERNEL_ABI_OLD_WAIT_QUIESCENT:
+ case LTTNG_KERNEL_ABI_WAIT_QUIESCENT:
synchronize_trace();
return 0;
- case LTTNG_KERNEL_OLD_CALIBRATE:
+ case LTTNG_KERNEL_ABI_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;
+ struct lttng_kernel_abi_old_calibrate __user *ucalibrate =
+ (struct lttng_kernel_abi_old_calibrate __user *) arg;
+ struct lttng_kernel_abi_old_calibrate old_calibrate;
+ struct lttng_kernel_abi_calibrate calibrate;
int ret;
if (copy_from_user(&old_calibrate, ucalibrate, sizeof(old_calibrate)))
return -EFAULT;
return ret;
}
- case LTTNG_KERNEL_CALIBRATE:
+ case LTTNG_KERNEL_ABI_CALIBRATE:
{
- struct lttng_kernel_calibrate __user *ucalibrate =
- (struct lttng_kernel_calibrate __user *) arg;
- struct lttng_kernel_calibrate calibrate;
+ struct lttng_kernel_abi_calibrate __user *ucalibrate =
+ (struct lttng_kernel_abi_calibrate __user *) arg;
+ struct lttng_kernel_abi_calibrate calibrate;
int ret;
if (copy_from_user(&calibrate, ucalibrate, sizeof(calibrate)))
}
}
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0))
+#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0))
static const struct proc_ops lttng_proc_ops = {
.proc_ioctl = lttng_ioctl,
#ifdef CONFIG_COMPAT
static
int lttng_abi_create_channel(struct file *session_file,
- struct lttng_kernel_channel *chan_param,
+ struct lttng_kernel_abi_channel *chan_param,
enum channel_type channel_type)
{
- struct lttng_session *session = session_file->private_data;
+ struct lttng_kernel_session *session = session_file->private_data;
const struct file_operations *fops = NULL;
const char *transport_name;
- struct lttng_channel *chan;
+ struct lttng_kernel_channel_buffer *chan;
struct file *chan_file;
int chan_fd;
int ret = 0;
- chan_fd = lttng_get_unused_fd();
+ chan_fd = get_unused_fd_flags(0);
if (chan_fd < 0) {
ret = chan_fd;
goto fd_error;
}
switch (channel_type) {
case PER_CPU_CHANNEL:
- if (chan_param->output == LTTNG_KERNEL_SPLICE) {
+ if (chan_param->output == LTTNG_KERNEL_ABI_SPLICE) {
transport_name = chan_param->overwrite ?
"relay-overwrite" : "relay-discard";
- } else if (chan_param->output == LTTNG_KERNEL_MMAP) {
+ } else if (chan_param->output == LTTNG_KERNEL_ABI_MMAP) {
transport_name = chan_param->overwrite ?
"relay-overwrite-mmap" : "relay-discard-mmap";
} else {
}
break;
case METADATA_CHANNEL:
- if (chan_param->output == LTTNG_KERNEL_SPLICE)
+ if (chan_param->output == LTTNG_KERNEL_ABI_SPLICE)
transport_name = "relay-metadata";
- else if (chan_param->output == LTTNG_KERNEL_MMAP)
+ else if (chan_param->output == LTTNG_KERNEL_ABI_MMAP)
transport_name = "relay-metadata-mmap";
else
return -EINVAL;
* 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 = lttng_channel_buffer_create(session, transport_name, NULL,
chan_param->subbuf_size,
chan_param->num_subbuf,
chan_param->switch_timer_interval,
ret = -EINVAL;
goto chan_error;
}
- chan->file = chan_file;
+ chan->priv->parent.file = chan_file;
chan_file->private_data = chan;
fd_install(chan_fd, chan_file);
}
static
-int lttng_abi_session_set_name(struct lttng_session *session,
- struct lttng_kernel_session_name *name)
+int lttng_abi_session_set_name(struct lttng_kernel_session *session,
+ struct lttng_kernel_abi_session_name *name)
{
size_t len;
- len = strnlen(name->name, LTTNG_KERNEL_SESSION_NAME_LEN);
+ len = strnlen(name->name, LTTNG_KERNEL_ABI_SESSION_NAME_LEN);
- if (len == LTTNG_KERNEL_SESSION_NAME_LEN) {
+ if (len == LTTNG_KERNEL_ABI_SESSION_NAME_LEN) {
/* Name is too long/malformed */
return -EINVAL;
}
- strcpy(session->name, name->name);
+ strcpy(session->priv->name, name->name);
return 0;
}
static
-int lttng_abi_session_set_creation_time(struct lttng_session *session,
- struct lttng_kernel_session_creation_time *time)
+int lttng_abi_session_set_creation_time(struct lttng_kernel_session *session,
+ struct lttng_kernel_abi_session_creation_time *time)
{
size_t len;
- len = strnlen(time->iso8601, LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN);
+ len = strnlen(time->iso8601, LTTNG_KERNEL_ABI_SESSION_CREATION_TIME_ISO8601_LEN);
- if (len == LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN) {
+ if (len == LTTNG_KERNEL_ABI_SESSION_CREATION_TIME_ISO8601_LEN) {
/* Time is too long/malformed */
return -EINVAL;
}
- strcpy(session->creation_time, time->iso8601);
+ strcpy(session->priv->creation_time, time->iso8601);
return 0;
}
static
-enum tracker_type get_tracker_type(struct lttng_kernel_tracker_args *tracker)
+int lttng_counter_release(struct inode *inode, struct file *file)
{
- switch (tracker->type) {
- case LTTNG_KERNEL_TRACKER_PID:
- return TRACKER_PID;
- case LTTNG_KERNEL_TRACKER_VPID:
- return TRACKER_VPID;
- case LTTNG_KERNEL_TRACKER_UID:
- return TRACKER_UID;
- case LTTNG_KERNEL_TRACKER_VUID:
- return TRACKER_VUID;
- case LTTNG_KERNEL_TRACKER_GID:
- return TRACKER_GID;
- case LTTNG_KERNEL_TRACKER_VGID:
- return TRACKER_VGID;
- default:
- return TRACKER_UNKNOWN;
+ struct lttng_kernel_channel_counter *counter = file->private_data;
+
+ if (counter) {
+ /*
+ * Do not destroy the counter itself. Wait of the owner
+ * (event_notifier group) to be destroyed.
+ */
+ fput(counter->priv->owner);
}
+
+ return 0;
}
-/**
- * lttng_session_ioctl - lttng session fd ioctl
- *
- * @file: the file
- * @cmd: the command
- * @arg: command arg
- *
- * This ioctl implements lttng commands:
- * LTTNG_KERNEL_CHANNEL
- * Returns a LTTng channel file descriptor
- * LTTNG_KERNEL_ENABLE
- * Enables tracing for a session (weak enable)
- * LTTNG_KERNEL_DISABLE
- * 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 PID tracker
- * LTTNG_KERNEL_SESSION_UNTRACK_PID
- * Remove PID from session PID tracker
- * LTTNG_KERNEL_SESSION_TRACK_ID
- * Add ID to tracker
- * LTTNG_KERNEL_SESSION_UNTRACK_ID
- * Remove ID from tracker
- *
- * The returned channel will be deleted when its file descriptor is closed.
- */
static
-long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+int copy_user_event_param_ext(struct lttng_kernel_abi_event_ext *event_param_ext,
+ struct lttng_kernel_abi_event *event_param)
{
- struct lttng_session *session = file->private_data;
- struct lttng_kernel_channel chan_param;
- struct lttng_kernel_old_channel old_chan_param;
-
- switch (cmd) {
- case LTTNG_KERNEL_OLD_CHANNEL:
- {
- 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;
+ struct lttng_kernel_abi_event_ext __user *uevent_ext =
+ (struct lttng_kernel_abi_event_ext __user *) (unsigned long) event_param->event_ext;
+ uint32_t len;
+ int ret;
- return lttng_abi_create_channel(file, &chan_param,
- PER_CPU_CHANNEL);
- }
- case LTTNG_KERNEL_CHANNEL:
- {
- 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);
+ /* Use zeroed defaults if extension parameters are not set. */
+ if (!uevent_ext)
+ return 0;
+ ret = get_user(len, &uevent_ext->len);
+ if (ret)
+ return ret;
+ if (len > PAGE_SIZE)
+ return -E2BIG;
+ ret = lttng_copy_struct_from_user(event_param_ext, sizeof(*event_param_ext), uevent_ext, len);
+ if (ret)
+ return ret;
+ /* Ensure that len is consistent with the initial get_user(). */
+ event_param_ext->len = len;
+
+ /* Validate that we know of all flags and enum values used. */
+ switch (event_param_ext->match_check) {
+ case LTTNG_KERNEL_ABI_MATCH_DEFAULT:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_MATCH_IMMEDIATE:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_MATCH_LAZY:
+ break;
+ default:
+ return -EINVAL;
}
- 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:
- {
- 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 0;
+}
- return lttng_abi_create_channel(file, &chan_param,
- METADATA_CHANNEL);
- }
- case LTTNG_KERNEL_METADATA:
- {
- 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_id(session, TRACKER_PID, (int) arg);
- case LTTNG_KERNEL_SESSION_UNTRACK_PID:
- return lttng_session_untrack_id(session, TRACKER_PID, (int) arg);
- case LTTNG_KERNEL_SESSION_TRACK_ID:
- {
- struct lttng_kernel_tracker_args tracker;
- enum tracker_type tracker_type;
+static
+int user_event_param_ext_get_match_check(const struct lttng_kernel_abi_event_ext *event_param_ext,
+ enum lttng_kernel_abi_match_check *_match_check)
+{
+ enum lttng_kernel_abi_match_check match_check = LTTNG_KERNEL_ABI_MATCH_DEFAULT;
- if (copy_from_user(&tracker,
- (struct lttng_kernel_tracker_args __user *) arg,
- sizeof(struct lttng_kernel_tracker_args)))
- return -EFAULT;
- tracker_type = get_tracker_type(&tracker);
- if (tracker_type == TRACKER_UNKNOWN)
- return -EINVAL;
- return lttng_session_track_id(session, tracker_type, tracker.id);
- }
- case LTTNG_KERNEL_SESSION_UNTRACK_ID:
- {
- struct lttng_kernel_tracker_args tracker;
- enum tracker_type tracker_type;
+ if (event_param_ext->len < offsetofend(struct lttng_kernel_abi_event_ext, match_check))
+ goto end;
+ match_check = event_param_ext->match_check;
+end:
+ *_match_check = match_check;
+ return 0;
+}
- if (copy_from_user(&tracker,
- (struct lttng_kernel_tracker_args __user *) arg,
- sizeof(struct lttng_kernel_tracker_args)))
- return -EFAULT;
- tracker_type = get_tracker_type(&tracker);
- if (tracker_type == TRACKER_UNKNOWN)
- return -EINVAL;
- return lttng_session_untrack_id(session, tracker_type,
- tracker.id);
- }
- case LTTNG_KERNEL_SESSION_LIST_TRACKER_PIDS:
- return lttng_session_list_tracker_ids(session, TRACKER_PID);
- case LTTNG_KERNEL_SESSION_LIST_TRACKER_IDS:
- {
- struct lttng_kernel_tracker_args tracker;
- enum tracker_type tracker_type;
+static
+int create_counter_key_from_abi_dimensions(struct lttng_kernel_counter_key **_counter_key,
+ uint32_t nr_dimensions, void __user *ptr)
+{
+ struct lttng_kernel_abi_counter_key_dimension __user *udimension;
+ struct lttng_kernel_abi_counter_key_dimension kdimension = {};
+ struct lttng_kernel_counter_key *counter_key = NULL;
+ struct lttng_key_token *token_array = NULL;
+ uint32_t i;
+ int ret = 0;
- if (copy_from_user(&tracker,
- (struct lttng_kernel_tracker_args __user *) arg,
- sizeof(struct lttng_kernel_tracker_args)))
- return -EFAULT;
- tracker_type = get_tracker_type(&tracker);
- if (tracker_type == TRACKER_UNKNOWN)
- return -EINVAL;
- return lttng_session_list_tracker_ids(session, tracker_type);
+ if (!nr_dimensions || nr_dimensions > LTTNG_KERNEL_COUNTER_MAX_DIMENSIONS)
+ return -EINVAL;
+ counter_key = kzalloc(sizeof(*counter_key), GFP_KERNEL);
+ if (!counter_key)
+ return -ENOMEM;
+ counter_key->nr_dimensions = nr_dimensions;
+ /* Only a single dimension is supported. */
+ if (WARN_ON_ONCE(nr_dimensions != 1)) {
+ ret = -EINVAL;
+ goto error;
}
- case LTTNG_KERNEL_SESSION_METADATA_REGEN:
- return lttng_session_metadata_regenerate(session);
- case LTTNG_KERNEL_SESSION_STATEDUMP:
- return lttng_session_statedump(session);
- case LTTNG_KERNEL_SESSION_SET_NAME:
- {
- struct lttng_kernel_session_name name;
-
- if (copy_from_user(&name,
- (struct lttng_kernel_session_name __user *) arg,
- sizeof(struct lttng_kernel_session_name)))
- return -EFAULT;
- return lttng_abi_session_set_name(session, &name);
+ udimension = (struct lttng_kernel_abi_counter_key_dimension __user *)ptr;
+ ret = lttng_copy_struct_from_user(&kdimension, sizeof(kdimension), udimension, sizeof(*udimension));
+ if (ret)
+ goto error;
+ if (kdimension.len > PAGE_SIZE) {
+ ret = -E2BIG;
+ goto error;
}
- case LTTNG_KERNEL_SESSION_SET_CREATION_TIME:
+ switch (kdimension.key_type) {
+ case LTTNG_KERNEL_ABI_KEY_TYPE_TOKENS:
{
- struct lttng_kernel_session_creation_time time;
+ struct lttng_kernel_abi_counter_key_dimension_tokens kdimension_tokens = {};
+ struct lttng_kernel_abi_counter_key_dimension_tokens __user *udimension_tokens;
+ struct lttng_kernel_abi_key_token __user *utoken;
+ uint32_t nr_tokens;
+
+ udimension_tokens = (struct lttng_kernel_abi_counter_key_dimension_tokens __user *)ptr;
+ ret = lttng_copy_struct_from_user(&kdimension_tokens, sizeof(kdimension_tokens),
+ udimension_tokens, kdimension.len);
+ if (ret)
+ goto error;
+ nr_tokens = kdimension_tokens.nr_key_tokens;
+ if (nr_tokens > LTTNG_KERNEL_COUNTER_MAX_TOKENS) {
+ ret = -EINVAL;
+ goto error;
+ }
+ token_array = kzalloc(nr_tokens * sizeof(*token_array), GFP_KERNEL);
+ if (!token_array) {
+ ret = -ENOMEM;
+ goto error;
+ }
+ counter_key->dimension_array[0].token_array = token_array;
+ counter_key->dimension_array[0].nr_key_tokens = nr_tokens;
+ utoken = (struct lttng_kernel_abi_key_token __user *)((unsigned long)ptr + kdimension.len);
+ for (i = 0; i < nr_tokens; i++) {
+ struct lttng_kernel_abi_key_token ktoken = {};
+ struct lttng_key_token *key_token = &token_array[i];
+ uint32_t token_len = 0;
+
+ ret = lttng_copy_struct_from_user(&ktoken, sizeof(ktoken), utoken, sizeof(*utoken));
+ if (ret)
+ goto error;
+ token_len += ktoken.len;
+ switch (ktoken.type) {
+ case LTTNG_KERNEL_ABI_KEY_TOKEN_STRING:
+ {
+ struct lttng_kernel_abi_key_token_string __user *utoken_string;
+ struct lttng_kernel_abi_key_token_string *ktoken_string;
+ char __user *string_ptr;
+ size_t string_len;
+
+ utoken_string = (struct lttng_kernel_abi_key_token_string __user *) utoken;
+ ret = lttng_copy_struct_from_user(&ktoken_string, sizeof(ktoken_string),
+ utoken_string, ktoken.len);
+ if (ret)
+ goto error;
+ string_ptr = (char __user *) ((unsigned long)utoken_string + ktoken.len);
+ string_len = ktoken_string->string_len;
+ key_token->type = LTTNG_KEY_TOKEN_STRING;
+ if (!string_len || string_len > PAGE_SIZE) {
+ ret = -EINVAL;
+ goto error;
+ }
+ key_token->str = kzalloc(string_len, GFP_KERNEL);
+ if (!key_token->str) {
+ ret = -ENOMEM;
+ goto error;
+ }
+ ret = copy_from_user(key_token->str, string_ptr, string_len);
+ if (ret)
+ goto error;
+ if (key_token->str[string_len - 1] != '\0') {
+ ret = -EINVAL;
+ goto error;
+ }
+ token_len += string_len;
+ break;
+ }
+ case LTTNG_KERNEL_ABI_KEY_TOKEN_EVENT_NAME:
+ key_token->type = LTTNG_KEY_TOKEN_EVENT_NAME;
+ break;
+
+ case LTTNG_KERNEL_ABI_KEY_TOKEN_PROVIDER_NAME:
+ lttng_fallthrough;
+ default:
+ ret = -EINVAL;
+ goto error;
+ }
+ utoken = (struct lttng_kernel_abi_key_token __user *)((unsigned long)utoken + token_len);
+ }
- if (copy_from_user(&time,
- (struct lttng_kernel_session_creation_time __user *) arg,
- sizeof(struct lttng_kernel_session_creation_time)))
- return -EFAULT;
- return lttng_abi_session_set_creation_time(session, &time);
+ break;
}
+ case LTTNG_KERNEL_ABI_KEY_TYPE_INTEGER:
default:
- return -ENOIOCTLCMD;
+ ret = -EINVAL;
+ goto error;
}
+ *_counter_key = counter_key;
+ return 0;
+
+error:
+ destroy_counter_key(counter_key);
+ return ret;
}
-/*
- * Called when the last file reference is dropped.
- *
- * Big fat note: channels and events are invariant for the whole session after
- * their creation. So this session destruction also destroys all channel and
- * event structures specific to this session (they are not destroyed when their
- * individual file is released).
- */
-static
-int lttng_session_release(struct inode *inode, struct file *file)
+int create_counter_key_from_kernel(struct lttng_kernel_counter_key **_new_key,
+ const struct lttng_kernel_counter_key *src_key)
{
- struct lttng_session *session = file->private_data;
+ struct lttng_kernel_counter_key *new_key;
+ int i, ret = 0;
- if (session)
- lttng_session_destroy(session);
+ new_key = kzalloc(sizeof(*new_key), GFP_KERNEL);
+ if (!new_key)
+ return -ENOMEM;
+ new_key->nr_dimensions = src_key->nr_dimensions;
+ for (i = 0; i < src_key->nr_dimensions; i++) {
+ struct lttng_kernel_counter_key_dimension *new_dimension = &new_key->dimension_array[i];
+ const struct lttng_kernel_counter_key_dimension *src_dimension = &src_key->dimension_array[i];
+ uint32_t nr_tokens = src_dimension->nr_key_tokens;
+ int j;
+
+ new_dimension->nr_key_tokens = nr_tokens;
+ new_dimension->token_array = kzalloc(nr_tokens * sizeof(*new_dimension->token_array), GFP_KERNEL);
+ if (!new_dimension->token_array) {
+ ret = -ENOMEM;
+ goto error;
+ }
+ for (j = 0; j < nr_tokens; j++) {
+ struct lttng_key_token *new_key_token = &new_dimension->token_array[j];
+ struct lttng_key_token *src_key_token = &src_dimension->token_array[j];
+
+ switch (src_key_token->type) {
+ case LTTNG_KEY_TOKEN_STRING:
+ new_key_token->type = LTTNG_KEY_TOKEN_STRING;
+ new_key_token->str = kstrdup(src_key_token->str, GFP_KERNEL);
+ if (!new_key_token->str) {
+ ret = -ENOMEM;
+ goto error;
+ }
+ break;
+ case LTTNG_KEY_TOKEN_EVENT_NAME:
+ new_key_token->type = LTTNG_KEY_TOKEN_EVENT_NAME;
+ break;
+
+ default:
+ ret = -EINVAL;
+ goto error;
+ }
+ }
+ }
+ *_new_key = new_key;
return 0;
+
+error:
+ destroy_counter_key(new_key);
+ return ret;
}
-static const struct file_operations lttng_session_fops = {
- .owner = THIS_MODULE,
- .release = lttng_session_release,
- .unlocked_ioctl = lttng_session_ioctl,
-#ifdef CONFIG_COMPAT
- .compat_ioctl = lttng_session_ioctl,
-#endif
-};
+void destroy_counter_key(struct lttng_kernel_counter_key *counter_key)
+{
+ int i;
+
+ if (!counter_key)
+ return;
+ for (i = 0; i < counter_key->nr_dimensions; i++) {
+ struct lttng_kernel_counter_key_dimension *dimension = &counter_key->dimension_array[i];
+ uint32_t nr_tokens = dimension->nr_key_tokens;
+ int j;
+
+ for (j = 0; j < nr_tokens; j++) {
+ struct lttng_key_token *key_token = &dimension->token_array[j];
+
+ switch (key_token->type) {
+ case LTTNG_KEY_TOKEN_STRING:
+ kfree(key_token->str);
+ break;
+
+ case LTTNG_KEY_TOKEN_EVENT_NAME:
+ lttng_fallthrough;
+ case LTTNG_KEY_TOKEN_UNKNOWN:
+ break;
+
+ default:
+ WARN_ON_ONCE(1);
+ }
+ }
+ kfree(dimension->token_array);
+ }
+ kfree(counter_key);
+}
-/**
- * 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
-unsigned int lttng_metadata_ring_buffer_poll(struct file *filp,
- poll_table *wait)
+long lttng_counter_ioctl_abi_old_counter_read(struct lttng_kernel_channel_counter *counter,
+ unsigned int cmd, unsigned long arg)
{
- 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);
+ size_t indexes[LTTNG_KERNEL_ABI_OLD_COUNTER_DIMENSION_MAX] = {};
+ struct lttng_kernel_abi_old_counter_read local_counter_read;
+ struct lttng_kernel_abi_old_counter_read __user *ucounter_read =
+ (struct lttng_kernel_abi_old_counter_read __user *) arg;
+ bool overflow, underflow;
+ int64_t value;
+ int32_t cpu;
+ int ret, i;
+
+ if (copy_from_user(&local_counter_read, ucounter_read,
+ sizeof(local_counter_read)))
+ return -EFAULT;
+ if (validate_zeroed_padding(local_counter_read.padding,
+ sizeof(local_counter_read.padding)))
+ return -EINVAL;
+ if (local_counter_read.index.number_dimensions > LTTNG_KERNEL_ABI_OLD_COUNTER_DIMENSION_MAX)
+ return -EINVAL;
+ /* Cast all indexes into size_t. */
+ for (i = 0; i < local_counter_read.index.number_dimensions; i++)
+ indexes[i] = local_counter_read.index.dimension_indexes[i];
+ cpu = local_counter_read.cpu;
- if (finalized)
- mask |= POLLHUP;
+ ret = lttng_kernel_counter_read(counter, indexes, cpu, &value, &overflow, &underflow);
+ if (ret)
+ return ret;
+ local_counter_read.value.value = value;
+ local_counter_read.value.overflow = overflow;
+ local_counter_read.value.underflow = underflow;
- mutex_lock(&stream->metadata_cache->lock);
- if (stream->metadata_cache->metadata_written >
- stream->metadata_out)
- mask |= POLLIN;
- mutex_unlock(&stream->metadata_cache->lock);
- }
+ if (copy_to_user(&ucounter_read->value, &local_counter_read.value,
+ sizeof(local_counter_read.value)))
+ return -EFAULT;
- return mask;
+ return 0;
}
static
-void lttng_metadata_ring_buffer_ioctl_put_next_subbuf(struct file *filp,
+long lttng_counter_ioctl_abi_old_counter_aggregate(struct lttng_kernel_channel_counter *counter,
unsigned int cmd, unsigned long arg)
{
- struct lttng_metadata_stream *stream = filp->private_data;
+ size_t indexes[LTTNG_KERNEL_ABI_OLD_COUNTER_DIMENSION_MAX] = {};
+ struct lttng_kernel_abi_old_counter_aggregate local_counter_aggregate;
+ struct lttng_kernel_abi_old_counter_aggregate __user *ucounter_aggregate =
+ (struct lttng_kernel_abi_old_counter_aggregate __user *) arg;
+ bool overflow, underflow;
+ int64_t value;
+ int ret, i;
+
+ if (copy_from_user(&local_counter_aggregate, ucounter_aggregate,
+ sizeof(local_counter_aggregate)))
+ return -EFAULT;
+ if (validate_zeroed_padding(local_counter_aggregate.padding,
+ sizeof(local_counter_aggregate.padding)))
+ return -EINVAL;
+ if (local_counter_aggregate.index.number_dimensions > LTTNG_KERNEL_ABI_OLD_COUNTER_DIMENSION_MAX)
+ return -EINVAL;
+ /* Cast all indexes into size_t. */
+ for (i = 0; i < local_counter_aggregate.index.number_dimensions; i++)
+ indexes[i] = local_counter_aggregate.index.dimension_indexes[i];
- stream->metadata_out = stream->metadata_in;
+ ret = lttng_kernel_counter_aggregate(counter, indexes, &value, &overflow, &underflow);
+ if (ret)
+ return ret;
+ local_counter_aggregate.value.value = value;
+ local_counter_aggregate.value.overflow = overflow;
+ local_counter_aggregate.value.underflow = underflow;
+
+ if (copy_to_user(&ucounter_aggregate->value, &local_counter_aggregate.value,
+ sizeof(local_counter_aggregate.value)))
+ return -EFAULT;
+
+ return 0;
}
-/*
- * 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)
+long lttng_counter_ioctl_abi_old_counter_clear(struct lttng_kernel_channel_counter *counter,
+ unsigned int cmd, unsigned long arg)
{
- int ret;
- struct lttng_metadata_cache *cache = stream->metadata_cache;
+ size_t indexes[LTTNG_KERNEL_ABI_OLD_COUNTER_DIMENSION_MAX] = {};
+ struct lttng_kernel_abi_old_counter_clear local_counter_clear;
+ struct lttng_kernel_abi_old_counter_clear __user *ucounter_clear =
+ (struct lttng_kernel_abi_old_counter_clear __user *) arg;
+ int i;
+
+ if (copy_from_user(&local_counter_clear, ucounter_clear,
+ sizeof(local_counter_clear)))
+ return -EFAULT;
+ if (validate_zeroed_padding(local_counter_clear.padding,
+ sizeof(local_counter_clear.padding)))
+ return -EINVAL;
+ if (local_counter_clear.index.number_dimensions > LTTNG_KERNEL_ABI_OLD_COUNTER_DIMENSION_MAX)
+ return -EINVAL;
+ /* Cast all indexes into size_t. */
+ for (i = 0; i < local_counter_clear.index.number_dimensions; i++)
+ indexes[i] = local_counter_clear.index.dimension_indexes[i];
+ return lttng_kernel_counter_clear(counter, indexes);
+}
- mutex_lock(&cache->lock);
- if (stream->metadata_out != cache->metadata_written) {
- ret = -EBUSY;
- goto end;
+static
+long lttng_counter_ioctl_abi_counter_read(struct lttng_kernel_channel_counter *counter,
+ unsigned int cmd, unsigned long arg)
+{
+ size_t indexes[LTTNG_KERNEL_COUNTER_MAX_DIMENSIONS] = {};
+ struct lttng_kernel_abi_counter_read kcounter_read = {};
+ struct lttng_kernel_abi_counter_read __user *ucounter_read =
+ (struct lttng_kernel_abi_counter_read __user *) arg;
+ uint32_t len, number_dimensions;
+ bool overflow, underflow;
+ int64_t value;
+ int32_t cpu;
+ int ret, i;
+
+ ret = get_user(len, &ucounter_read->len);
+ if (ret)
+ return ret;
+ if (len > PAGE_SIZE)
+ return -E2BIG;
+ if (len < offsetofend(struct lttng_kernel_abi_counter_read, value))
+ return -EINVAL;
+ ret = lttng_copy_struct_from_user(&kcounter_read, sizeof(kcounter_read),
+ ucounter_read, len);
+ if (ret)
+ return ret;
+ number_dimensions = kcounter_read.index.number_dimensions;
+ if (!number_dimensions || number_dimensions > LTTNG_KERNEL_COUNTER_MAX_DIMENSIONS)
+ return -EINVAL;
+ /* Cast all indexes into size_t. */
+ for (i = 0; i < number_dimensions; i++) {
+ uint64_t __user *ptr = ((uint64_t __user *)(unsigned long)kcounter_read.index.ptr) + i;
+ uint64_t index;
+
+ ret = get_user(index, ptr);
+ if (ret)
+ return ret;
+ indexes[i] = index;
}
- stream->metadata_out = 0;
- stream->metadata_in = 0;
- wake_up_interruptible(&stream->read_wait);
- ret = 0;
+ cpu = kcounter_read.cpu;
+ ret = lttng_kernel_counter_read(counter, indexes, cpu, &value, &overflow, &underflow);
+ if (ret)
+ return ret;
+ kcounter_read.value.value = value;
+ kcounter_read.value.flags |= underflow ? LTTNG_KERNEL_ABI_COUNTER_VALUE_FLAG_UNDERFLOW : 0;
+ kcounter_read.value.flags |= overflow ? LTTNG_KERNEL_ABI_COUNTER_VALUE_FLAG_OVERFLOW : 0;
-end:
- mutex_unlock(&cache->lock);
+ if (copy_to_user(&ucounter_read->value, &kcounter_read.value, sizeof(kcounter_read.value)))
+ return -EFAULT;
+
+ return 0;
+}
+
+static
+long lttng_counter_ioctl_abi_counter_aggregate(struct lttng_kernel_channel_counter *counter,
+ unsigned int cmd, unsigned long arg)
+{
+ size_t indexes[LTTNG_KERNEL_COUNTER_MAX_DIMENSIONS] = {};
+ struct lttng_kernel_abi_counter_aggregate kcounter_aggregate = {};
+ struct lttng_kernel_abi_counter_aggregate __user *ucounter_aggregate =
+ (struct lttng_kernel_abi_counter_aggregate __user *) arg;
+ uint32_t len, number_dimensions;
+ bool overflow, underflow;
+ int64_t value;
+ int ret, i;
+
+ ret = get_user(len, &ucounter_aggregate->len);
+ if (ret)
+ return ret;
+ if (len > PAGE_SIZE)
+ return -E2BIG;
+ if (len < offsetofend(struct lttng_kernel_abi_counter_aggregate, value))
+ return -EINVAL;
+ ret = lttng_copy_struct_from_user(&kcounter_aggregate, sizeof(kcounter_aggregate),
+ ucounter_aggregate, len);
+ if (ret)
+ return ret;
+ number_dimensions = kcounter_aggregate.index.number_dimensions;
+ if (!number_dimensions || number_dimensions > LTTNG_KERNEL_COUNTER_MAX_DIMENSIONS)
+ return -EINVAL;
+ /* Cast all indexes into size_t. */
+ for (i = 0; i < number_dimensions; i++) {
+ uint64_t __user *ptr = ((uint64_t __user *)(unsigned long)kcounter_aggregate.index.ptr) + i;
+ uint64_t index;
+
+ ret = get_user(index, ptr);
+ if (ret)
+ return ret;
+ indexes[i] = index;
+ }
+ ret = lttng_kernel_counter_aggregate(counter, indexes, &value, &overflow, &underflow);
+ if (ret)
+ return ret;
+ kcounter_aggregate.value.value = value;
+ kcounter_aggregate.value.flags |= underflow ? LTTNG_KERNEL_ABI_COUNTER_VALUE_FLAG_UNDERFLOW : 0;
+ kcounter_aggregate.value.flags |= overflow ? LTTNG_KERNEL_ABI_COUNTER_VALUE_FLAG_OVERFLOW : 0;
+
+ if (copy_to_user(&ucounter_aggregate->value, &kcounter_aggregate.value, sizeof(kcounter_aggregate.value)))
+ return -EFAULT;
+
+ return 0;
+}
+
+static
+long lttng_counter_ioctl_abi_counter_clear(struct lttng_kernel_channel_counter *counter,
+ unsigned int cmd, unsigned long arg)
+{
+ size_t indexes[LTTNG_KERNEL_COUNTER_MAX_DIMENSIONS] = {};
+ struct lttng_kernel_abi_counter_clear kcounter_clear = {};
+ struct lttng_kernel_abi_counter_clear __user *ucounter_clear =
+ (struct lttng_kernel_abi_counter_clear __user *) arg;
+ uint32_t len, number_dimensions;
+ int ret, i;
+
+ ret = get_user(len, &ucounter_clear->len);
+ if (ret)
+ return ret;
+ if (len > PAGE_SIZE)
+ return -E2BIG;
+ if (len < offsetofend(struct lttng_kernel_abi_counter_clear, index))
+ return -EINVAL;
+ ret = lttng_copy_struct_from_user(&kcounter_clear, sizeof(kcounter_clear),
+ ucounter_clear, len);
+ if (ret)
+ return ret;
+ number_dimensions = kcounter_clear.index.number_dimensions;
+ if (!number_dimensions || number_dimensions > LTTNG_KERNEL_COUNTER_MAX_DIMENSIONS)
+ return -EINVAL;
+ /* Cast all indexes into size_t. */
+ for (i = 0; i < number_dimensions; i++) {
+ uint64_t __user *ptr = ((uint64_t __user *)(unsigned long)kcounter_clear.index.ptr) + i;
+ uint64_t index;
+
+ ret = get_user(index, ptr);
+ if (ret)
+ return ret;
+ indexes[i] = index;
+ }
+ return lttng_kernel_counter_clear(counter, indexes);
+}
+
+static
+long lttng_counter_ioctl_abi_counter_event(struct file *file,
+ struct lttng_kernel_channel_counter *counter,
+ unsigned int cmd, unsigned long arg)
+{
+ struct lttng_kernel_abi_counter_event __user *ucounter_event =
+ (struct lttng_kernel_abi_counter_event __user *) arg;
+ struct lttng_kernel_abi_counter_event kcounter_event = {};
+ struct lttng_kernel_counter_event *counter_event;
+ uint32_t len;
+ int ret;
+
+ ret = get_user(len, &ucounter_event->len);
+ if (ret)
+ return ret;
+ if (len > PAGE_SIZE)
+ return -E2BIG;
+ if (len < offsetofend(struct lttng_kernel_abi_counter_event, number_key_dimensions))
+ return -EINVAL;
+ counter_event = kzalloc(sizeof(*counter_event), GFP_KERNEL);
+ if (!counter_event)
+ return -ENOMEM;
+ ret = lttng_copy_struct_from_user(&kcounter_event, sizeof(kcounter_event),
+ ucounter_event, len);
+ if (ret)
+ goto end_counter_event;
+ memcpy(&counter_event->event_param, &kcounter_event.event, sizeof(counter_event->event_param));
+ ret = copy_user_event_param_ext(&counter_event->event_param_ext, &kcounter_event.event);
+ if (ret)
+ goto end_counter_event;
+ switch (kcounter_event.action) {
+ case LTTNG_KERNEL_ABI_COUNTER_ACTION_INCREMENT:
+ /* No specific data for this action. */
+ break;
+ default:
+ ret = -EINVAL;
+ goto end_counter_event;
+ }
+ ret = create_counter_key_from_abi_dimensions(&counter_event->counter_key,
+ kcounter_event.number_key_dimensions,
+ (void __user *) arg + len);
+ if (ret)
+ goto end_counter_event;
+ ret = lttng_abi_create_event_counter_enabler(file, counter_event);
+ destroy_counter_key(counter_event->counter_key);
+end_counter_event:
+ kfree(counter_event);
return ret;
}
static
-long lttng_metadata_ring_buffer_ioctl(struct file *filp,
+long lttng_counter_ioctl_abi_counter_map_descriptor(struct lttng_kernel_channel_counter *counter,
unsigned int cmd, unsigned long arg)
{
+ struct lttng_kernel_abi_counter_map_descriptor __user *udescriptor =
+ (struct lttng_kernel_abi_counter_map_descriptor __user *) arg;
+ struct lttng_kernel_abi_counter_map_descriptor kdescriptor = {};
+ struct lttng_counter_map_descriptor *descriptor;
+ char key[LTTNG_KERNEL_COUNTER_KEY_LEN] = {};
+ uint64_t array_indexes[1];
+ size_t key_strlen;
+ uint32_t len;
int ret;
- struct lttng_metadata_stream *stream = filp->private_data;
- struct lib_ring_buffer *buf = stream->priv;
+
+ ret = get_user(len, &udescriptor->len);
+ if (ret)
+ return ret;
+ if (len > PAGE_SIZE)
+ return -E2BIG;
+ if (len < offsetofend(struct lttng_kernel_abi_counter_map_descriptor, array_indexes_len))
+ return -EINVAL;
+ ret = lttng_copy_struct_from_user(&kdescriptor, sizeof(kdescriptor), udescriptor, len);
+ if (ret)
+ return ret;
+ mutex_lock(&counter->priv->map.lock);
+ if (kdescriptor.descriptor_index >= counter->priv->map.nr_descriptors) {
+ ret = -EOVERFLOW;
+ goto map_descriptor_error_unlock;
+ }
+ if (kdescriptor.array_indexes_len < 1) {
+ ret = -EINVAL;
+ goto map_descriptor_error_unlock;
+ }
+ kdescriptor.array_indexes_len = 1;
+ descriptor = &counter->priv->map.descriptors[kdescriptor.descriptor_index];
+ kdescriptor.dimension = 0;
+ kdescriptor.user_token = descriptor->user_token;
+ memcpy(&key, descriptor->key, LTTNG_KERNEL_COUNTER_KEY_LEN);
+ array_indexes[0] = descriptor->array_index;
+ mutex_unlock(&counter->priv->map.lock);
+
+ key_strlen = strlen(key) + 1;
+ if (kdescriptor.key_string_len < key_strlen)
+ return -ENOSPC;
+ kdescriptor.key_string_len = key_strlen;
+ if (copy_to_user((char __user *)(unsigned long)kdescriptor.key_string, key, key_strlen))
+ return -EFAULT;
+ if (copy_to_user((uint64_t __user *)(unsigned long)kdescriptor.array_indexes, array_indexes, sizeof(uint64_t)))
+ return -EFAULT;
+ if (copy_to_user(udescriptor, &kdescriptor, min(sizeof(kdescriptor), (size_t)len)))
+ return -EFAULT;
+ return 0;
+
+map_descriptor_error_unlock:
+ mutex_unlock(&counter->priv->map.lock);
+ return ret;
+}
+
+static
+long lttng_counter_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ struct lttng_kernel_channel_counter *counter = file->private_data;
switch (cmd) {
- case RING_BUFFER_GET_NEXT_SUBBUF:
+ case LTTNG_KERNEL_ABI_OLD_COUNTER_READ:
+ return lttng_counter_ioctl_abi_old_counter_read(counter, cmd, arg);
+ case LTTNG_KERNEL_ABI_OLD_COUNTER_AGGREGATE:
+ return lttng_counter_ioctl_abi_old_counter_aggregate(counter, cmd, arg);
+ case LTTNG_KERNEL_ABI_OLD_COUNTER_CLEAR:
+ return lttng_counter_ioctl_abi_old_counter_clear(counter, cmd, arg);
+ case LTTNG_KERNEL_ABI_COUNTER_READ:
+ return lttng_counter_ioctl_abi_counter_read(counter, cmd, arg);
+ case LTTNG_KERNEL_ABI_COUNTER_AGGREGATE:
+ return lttng_counter_ioctl_abi_counter_aggregate(counter, cmd, arg);
+ case LTTNG_KERNEL_ABI_COUNTER_CLEAR:
+ return lttng_counter_ioctl_abi_counter_clear(counter, cmd, arg);
+ case LTTNG_KERNEL_ABI_COUNTER_EVENT:
+ return lttng_counter_ioctl_abi_counter_event(file, counter, cmd, arg);
+ case LTTNG_KERNEL_ABI_ENABLE:
+ return lttng_channel_enable(&counter->parent);
+ case LTTNG_KERNEL_ABI_DISABLE:
+ return lttng_channel_disable(&counter->parent);
+ case LTTNG_KERNEL_ABI_SYSCALL_MASK:
+ return lttng_syscall_table_get_active_mask(&counter->priv->parent.syscall_table,
+ (struct lttng_kernel_abi_syscall_mask __user *) arg);
+ case LTTNG_KERNEL_ABI_COUNTER_MAP_NR_DESCRIPTORS:
{
- struct lttng_metadata_stream *stream = filp->private_data;
- struct lib_ring_buffer *buf = stream->priv;
- struct channel *chan = buf->backend.chan;
+ uint64_t __user *user_nr_descriptors = (uint64_t __user *) arg;
+ uint64_t nr_descriptors;
- 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;
+ mutex_lock(&counter->priv->map.lock);
+ nr_descriptors = counter->priv->map.nr_descriptors;
+ mutex_unlock(&counter->priv->map.lock);
+ return put_user(nr_descriptors, user_nr_descriptors);
}
- case RING_BUFFER_GET_SUBBUF:
- {
- /*
- * Random access is not allowed for metadata channel.
- */
+ case LTTNG_KERNEL_ABI_COUNTER_MAP_DESCRIPTOR:
+ return lttng_counter_ioctl_abi_counter_map_descriptor(counter, cmd, arg);
+ default:
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;
+static const struct file_operations lttng_counter_fops = {
+ .owner = THIS_MODULE,
+ .release = lttng_counter_release,
+ .unlocked_ioctl = lttng_counter_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = lttng_counter_ioctl,
+#endif
+};
+
+
+static
+enum tracker_type get_tracker_type(struct lttng_kernel_abi_tracker_args *tracker)
+{
+ switch (tracker->type) {
+ case LTTNG_KERNEL_ABI_TRACKER_PID:
+ return TRACKER_PID;
+ case LTTNG_KERNEL_ABI_TRACKER_VPID:
+ return TRACKER_VPID;
+ case LTTNG_KERNEL_ABI_TRACKER_UID:
+ return TRACKER_UID;
+ case LTTNG_KERNEL_ABI_TRACKER_VUID:
+ return TRACKER_VUID;
+ case LTTNG_KERNEL_ABI_TRACKER_GID:
+ return TRACKER_GID;
+ case LTTNG_KERNEL_ABI_TRACKER_VGID:
+ return TRACKER_VGID;
+ default:
+ return TRACKER_UNKNOWN;
}
- case RING_BUFFER_GET_METADATA_VERSION:
- {
- struct lttng_metadata_stream *stream = filp->private_data;
+}
- return put_u64(stream->version, arg);
+static
+int lttng_abi_copy_user_old_counter_conf(struct lttng_kernel_counter_conf *counter_conf,
+ struct lttng_kernel_abi_old_counter_conf __user *old_ucounter_conf)
+{
+ struct lttng_kernel_abi_old_counter_conf old_kcounter_conf;
+ struct lttng_kernel_counter_dimension *dimension;
+ int ret;
+
+ memset(counter_conf, 0, sizeof(*counter_conf));
+ ret = copy_from_user(&old_kcounter_conf, old_ucounter_conf,
+ sizeof(old_kcounter_conf));
+ if (ret)
+ return ret;
+ if (!old_kcounter_conf.number_dimensions ||
+ old_kcounter_conf.number_dimensions > LTTNG_KERNEL_COUNTER_MAX_DIMENSIONS)
+ return -EINVAL;
+ switch (old_kcounter_conf.arithmetic) {
+ case LTTNG_KERNEL_ABI_COUNTER_ARITHMETIC_MODULAR:
+ counter_conf->arithmetic = LTTNG_KERNEL_COUNTER_ARITHMETIC_MODULAR;
+ break;
+ default:
+ return -EINVAL;
}
- case RING_BUFFER_METADATA_CACHE_DUMP:
- {
- struct lttng_metadata_stream *stream = filp->private_data;
+ switch (old_kcounter_conf.bitness) {
+ case LTTNG_KERNEL_ABI_COUNTER_BITNESS_32:
+ counter_conf->bitness = LTTNG_KERNEL_COUNTER_BITNESS_32;
+ break;
+ case LTTNG_KERNEL_ABI_COUNTER_BITNESS_64:
+ counter_conf->bitness = LTTNG_KERNEL_COUNTER_BITNESS_64;
+ break;
+ default:
+ return -EINVAL;
+ }
+ counter_conf->global_sum_step = old_kcounter_conf.global_sum_step;
+ counter_conf->flags |= old_kcounter_conf.coalesce_hits ?
+ LTTNG_KERNEL_COUNTER_CONF_FLAG_COALESCE_HITS : 0;
+ dimension = &counter_conf->dimension_array[0];
+ dimension->flags |= old_kcounter_conf.dimensions[0].has_underflow ?
+ LTTNG_KERNEL_COUNTER_DIMENSION_FLAG_UNDERFLOW : 0;
+ dimension->flags |= old_kcounter_conf.dimensions[0].has_overflow ?
+ LTTNG_KERNEL_COUNTER_DIMENSION_FLAG_OVERFLOW : 0;
+ dimension->size = old_kcounter_conf.dimensions[0].size;
+ dimension->underflow_index = old_kcounter_conf.dimensions[0].underflow_index;
+ dimension->overflow_index = old_kcounter_conf.dimensions[0].overflow_index;
+ return 0;
+}
- return lttng_metadata_cache_dump(stream);
+static
+int lttng_abi_copy_user_counter_conf(struct lttng_kernel_counter_conf *counter_conf,
+ struct lttng_kernel_abi_counter_conf __user *ucounter_conf)
+{
+ uint32_t len, number_dimensions;
+ struct lttng_kernel_abi_counter_conf kcounter_conf = {};
+ struct lttng_kernel_counter_dimension *dimension;
+ struct lttng_kernel_abi_counter_dimension kdimension = {};
+ struct lttng_kernel_abi_counter_dimension __user *udimension;
+ int ret;
+
+ memset(counter_conf, 0, sizeof(*counter_conf));
+ ret = get_user(len, &ucounter_conf->len);
+ if (ret)
+ return ret;
+ if (len < offsetofend(struct lttng_kernel_abi_counter_conf, dimension_array))
+ return -EINVAL;
+ if (len > PAGE_SIZE)
+ return -EINVAL;
+
+ ret = lttng_copy_struct_from_user(&kcounter_conf, sizeof(kcounter_conf), ucounter_conf, len);
+ if (ret)
+ return ret;
+
+ /* Validate flags and enumerations */
+ switch (kcounter_conf.arithmetic) {
+ case LTTNG_KERNEL_ABI_COUNTER_ARITHMETIC_MODULAR:
+ counter_conf->arithmetic = LTTNG_KERNEL_COUNTER_ARITHMETIC_MODULAR;
+ break;
+ default:
+ return -EINVAL;
+ }
+ switch (kcounter_conf.bitness) {
+ case LTTNG_KERNEL_ABI_COUNTER_BITNESS_32:
+ counter_conf->bitness = LTTNG_KERNEL_COUNTER_BITNESS_32;
+ break;
+ case LTTNG_KERNEL_ABI_COUNTER_BITNESS_64:
+ counter_conf->bitness = LTTNG_KERNEL_COUNTER_BITNESS_64;
+ break;
+ default:
+ return -EINVAL;
}
+ if (kcounter_conf.flags & ~LTTNG_KERNEL_ABI_COUNTER_CONF_FLAG_COALESCE_HITS)
+ return -EINVAL;
+ counter_conf->global_sum_step = kcounter_conf.global_sum_step;
+ counter_conf->flags |= (kcounter_conf.flags & LTTNG_KERNEL_ABI_COUNTER_CONF_FLAG_COALESCE_HITS) ?
+ LTTNG_KERNEL_COUNTER_CONF_FLAG_COALESCE_HITS : 0;
+
+ number_dimensions = kcounter_conf.dimension_array.number_dimensions;
+ if (!number_dimensions || number_dimensions > LTTNG_KERNEL_COUNTER_MAX_DIMENSIONS)
+ return -EINVAL;
+ dimension = &counter_conf->dimension_array[0];
+ len = kcounter_conf.dimension_array.elem_len;
+ if (len > PAGE_SIZE)
+ return -E2BIG;
+ if (len < offsetofend(struct lttng_kernel_abi_counter_dimension, overflow_index))
+ return -EINVAL;
+ udimension = (struct lttng_kernel_abi_counter_dimension __user *)(unsigned long)kcounter_conf.dimension_array.ptr;
+ ret = lttng_copy_struct_from_user(&kdimension, sizeof(kdimension), udimension, len);
+ if (ret)
+ return ret;
+
+ /* Validate flags */
+ if (kdimension.flags & ~(LTTNG_KERNEL_ABI_COUNTER_DIMENSION_FLAG_UNDERFLOW |
+ LTTNG_KERNEL_ABI_COUNTER_DIMENSION_FLAG_OVERFLOW))
+ return -EINVAL;
+
+ dimension->flags |= (kdimension.flags & LTTNG_KERNEL_ABI_COUNTER_DIMENSION_FLAG_UNDERFLOW) ?
+ LTTNG_KERNEL_COUNTER_DIMENSION_FLAG_UNDERFLOW : 0;
+ dimension->flags |= (kdimension.flags & LTTNG_KERNEL_ABI_COUNTER_DIMENSION_FLAG_OVERFLOW) ?
+ LTTNG_KERNEL_COUNTER_DIMENSION_FLAG_OVERFLOW : 0;
+ dimension->size = kdimension.size;
+ dimension->underflow_index = kdimension.underflow_index;
+ dimension->overflow_index = kdimension.overflow_index;
+ return 0;
+}
+
+/**
+ * lttng_session_ioctl - lttng session fd ioctl
+ *
+ * @file: the file
+ * @cmd: the command
+ * @arg: command arg
+ *
+ * This ioctl implements lttng commands:
+ * LTTNG_KERNEL_ABI_CHANNEL
+ * Returns a LTTng channel file descriptor
+ * LTTNG_KERNEL_ABI_ENABLE
+ * Enables tracing for a session (weak enable)
+ * LTTNG_KERNEL_ABI_DISABLE
+ * Disables tracing for a session (strong disable)
+ * LTTNG_KERNEL_ABI_METADATA
+ * Returns a LTTng metadata file descriptor
+ * LTTNG_KERNEL_ABI_SESSION_TRACK_PID
+ * Add PID to session PID tracker
+ * LTTNG_KERNEL_ABI_SESSION_UNTRACK_PID
+ * Remove PID from session PID tracker
+ * LTTNG_KERNEL_ABI_SESSION_TRACK_ID
+ * Add ID to tracker
+ * LTTNG_KERNEL_ABI_SESSION_UNTRACK_ID
+ * Remove ID from tracker
+ *
+ * The returned channel will be deleted when its file descriptor is closed.
+ */
+static
+long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ struct lttng_kernel_session *session = file->private_data;
+ struct lttng_kernel_abi_channel chan_param;
+ struct lttng_kernel_abi_old_channel old_chan_param;
+ int ret;
+
+ /*
+ * Handle backward compatibility. OLD commands have wrong
+ * directions, replace them by the correct direction.
+ */
+ switch (cmd) {
+ case LTTNG_KERNEL_ABI_OLD_SESSION_TRACK_PID:
+ cmd = LTTNG_KERNEL_ABI_SESSION_TRACK_PID;
+ break;
+ case LTTNG_KERNEL_ABI_OLD_SESSION_UNTRACK_PID:
+ cmd = LTTNG_KERNEL_ABI_SESSION_UNTRACK_PID;
+ break;
+ case LTTNG_KERNEL_ABI_OLD_SESSION_TRACK_ID:
+ cmd = LTTNG_KERNEL_ABI_SESSION_TRACK_ID;
+ break;
+ case LTTNG_KERNEL_ABI_OLD_SESSION_UNTRACK_ID:
+ cmd = LTTNG_KERNEL_ABI_SESSION_UNTRACK_ID;
+ break;
+ case LTTNG_KERNEL_ABI_OLD_SESSION_LIST_TRACKER_IDS:
+ cmd = LTTNG_KERNEL_ABI_SESSION_LIST_TRACKER_IDS;
+ break;
+ case LTTNG_KERNEL_ABI_OLD_SESSION_SET_NAME:
+ cmd = LTTNG_KERNEL_ABI_SESSION_SET_NAME;
+ break;
+ case LTTNG_KERNEL_ABI_OLD_SESSION_SET_CREATION_TIME:
+ cmd = LTTNG_KERNEL_ABI_SESSION_SET_CREATION_TIME;
+ break;
default:
+ /* Nothing to do. */
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 LTTNG_KERNEL_ABI_OLD_CHANNEL:
+ {
+ if (copy_from_user(&old_chan_param,
+ (struct lttng_kernel_abi_old_channel __user *) arg,
+ sizeof(struct lttng_kernel_abi_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_ABI_CHANNEL:
+ {
+ if (copy_from_user(&chan_param,
+ (struct lttng_kernel_abi_channel __user *) arg,
+ sizeof(struct lttng_kernel_abi_channel)))
+ return -EFAULT;
+ return lttng_abi_create_channel(file, &chan_param,
+ PER_CPU_CHANNEL);
+ }
+ case LTTNG_KERNEL_ABI_OLD_SESSION_START:
+ case LTTNG_KERNEL_ABI_OLD_ENABLE:
+ case LTTNG_KERNEL_ABI_SESSION_START:
+ case LTTNG_KERNEL_ABI_ENABLE:
+ return lttng_session_enable(session);
+ case LTTNG_KERNEL_ABI_OLD_SESSION_STOP:
+ case LTTNG_KERNEL_ABI_OLD_DISABLE:
+ case LTTNG_KERNEL_ABI_SESSION_STOP:
+ case LTTNG_KERNEL_ABI_DISABLE:
+ return lttng_session_disable(session);
+ case LTTNG_KERNEL_ABI_OLD_METADATA:
+ {
+ if (copy_from_user(&old_chan_param,
+ (struct lttng_kernel_abi_old_channel __user *) arg,
+ sizeof(struct lttng_kernel_abi_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_ABI_METADATA:
+ {
+ if (copy_from_user(&chan_param,
+ (struct lttng_kernel_abi_channel __user *) arg,
+ sizeof(struct lttng_kernel_abi_channel)))
+ return -EFAULT;
+ return lttng_abi_create_channel(file, &chan_param,
+ METADATA_CHANNEL);
+ }
+ case LTTNG_KERNEL_ABI_SESSION_TRACK_PID:
+ return lttng_session_track_id(session, TRACKER_PID, (int) arg);
+ case LTTNG_KERNEL_ABI_SESSION_UNTRACK_PID:
+ return lttng_session_untrack_id(session, TRACKER_PID, (int) arg);
+ case LTTNG_KERNEL_ABI_SESSION_TRACK_ID:
+ {
+ struct lttng_kernel_abi_tracker_args tracker;
+ enum tracker_type tracker_type;
+
+ if (copy_from_user(&tracker,
+ (struct lttng_kernel_abi_tracker_args __user *) arg,
+ sizeof(struct lttng_kernel_abi_tracker_args)))
+ return -EFAULT;
+ tracker_type = get_tracker_type(&tracker);
+ if (tracker_type == TRACKER_UNKNOWN)
+ return -EINVAL;
+ return lttng_session_track_id(session, tracker_type, tracker.id);
+ }
+ case LTTNG_KERNEL_ABI_SESSION_UNTRACK_ID:
+ {
+ struct lttng_kernel_abi_tracker_args tracker;
+ enum tracker_type tracker_type;
+
+ if (copy_from_user(&tracker,
+ (struct lttng_kernel_abi_tracker_args __user *) arg,
+ sizeof(struct lttng_kernel_abi_tracker_args)))
+ return -EFAULT;
+ tracker_type = get_tracker_type(&tracker);
+ if (tracker_type == TRACKER_UNKNOWN)
+ return -EINVAL;
+ return lttng_session_untrack_id(session, tracker_type,
+ tracker.id);
+ }
+ case LTTNG_KERNEL_ABI_SESSION_LIST_TRACKER_PIDS:
+ return lttng_session_list_tracker_ids(session, TRACKER_PID);
+ case LTTNG_KERNEL_ABI_SESSION_LIST_TRACKER_IDS:
+ {
+ struct lttng_kernel_abi_tracker_args tracker;
+ enum tracker_type tracker_type;
+
+ if (copy_from_user(&tracker,
+ (struct lttng_kernel_abi_tracker_args __user *) arg,
+ sizeof(struct lttng_kernel_abi_tracker_args)))
+ return -EFAULT;
+ tracker_type = get_tracker_type(&tracker);
+ if (tracker_type == TRACKER_UNKNOWN)
+ return -EINVAL;
+ return lttng_session_list_tracker_ids(session, tracker_type);
+ }
+ case LTTNG_KERNEL_ABI_SESSION_METADATA_REGEN:
+ return lttng_session_metadata_regenerate(session);
+ case LTTNG_KERNEL_ABI_SESSION_STATEDUMP:
+ return lttng_session_statedump(session);
+ case LTTNG_KERNEL_ABI_SESSION_SET_NAME:
+ {
+ struct lttng_kernel_abi_session_name name;
+
+ if (copy_from_user(&name,
+ (struct lttng_kernel_abi_session_name __user *) arg,
+ sizeof(struct lttng_kernel_abi_session_name)))
+ return -EFAULT;
+ return lttng_abi_session_set_name(session, &name);
+ }
+ case LTTNG_KERNEL_ABI_SESSION_SET_CREATION_TIME:
+ {
+ struct lttng_kernel_abi_session_creation_time time;
+
+ if (copy_from_user(&time,
+ (struct lttng_kernel_abi_session_creation_time __user *) arg,
+ sizeof(struct lttng_kernel_abi_session_creation_time)))
+ return -EFAULT;
+ return lttng_abi_session_set_creation_time(session, &time);
+ }
+ case LTTNG_KERNEL_ABI_COUNTER:
+ {
+ struct lttng_kernel_counter_conf counter_conf;
+
+ ret = lttng_abi_copy_user_counter_conf(&counter_conf,
+ (struct lttng_kernel_abi_counter_conf __user *) arg);
+ if (ret)
+ return ret;
+ return lttng_abi_session_create_counter(session, &counter_conf);
+ }
+ default:
+ return -ENOIOCTLCMD;
+ }
+}
+
+/*
+ * Called when the last file reference is dropped.
+ *
+ * Big fat note: channels and events are invariant for the whole session after
+ * their creation. So this session destruction also destroys all channel and
+ * event structures specific to this session (they are not destroyed when their
+ * individual file is released).
+ */
+static
+int lttng_session_release(struct inode *inode, struct file *file)
+{
+ struct lttng_kernel_session *session = file->private_data;
+
+ if (session)
+ lttng_session_destroy(session);
+ return 0;
+}
+
+static const struct file_operations lttng_session_fops = {
+ .owner = THIS_MODULE,
+ .release = lttng_session_release,
+ .unlocked_ioctl = lttng_session_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = lttng_session_ioctl,
+#endif
+};
+
+/*
+ * When encountering empty buffer, flush current sub-buffer if non-empty
+ * and retry (if new data available to read after flush).
+ */
+static
+ssize_t lttng_event_notifier_group_notif_read(struct file *filp, char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct lttng_event_notifier_group *event_notifier_group = filp->private_data;
+ struct lttng_kernel_ring_buffer_channel *chan = event_notifier_group->chan;
+ struct lttng_kernel_ring_buffer *buf = event_notifier_group->buf;
+ ssize_t read_count = 0, len;
+ size_t read_offset;
+
+ might_sleep();
+ if (!lttng_access_ok(VERIFY_WRITE, user_buf, count))
+ return -EFAULT;
+
+ /* Finish copy of previous record */
+ if (*ppos != 0) {
+ if (count != 0) {
+ len = chan->iter.len_left;
+ read_offset = *ppos;
+ goto skip_get_next;
+ }
+ }
+
+ while (read_count < count) {
+ size_t copy_len, space_left;
+
+ len = lib_ring_buffer_get_next_record(chan, buf);
+len_test:
+ if (len < 0) {
+ /*
+ * Check if buffer is finalized (end of file).
+ */
+ if (len == -ENODATA) {
+ /* A 0 read_count will tell about end of file */
+ goto nodata;
+ }
+ if (filp->f_flags & O_NONBLOCK) {
+ if (!read_count)
+ read_count = -EAGAIN;
+ goto nodata;
+ } else {
+ int error;
+
+ /*
+ * No data available at the moment, return what
+ * we got.
+ */
+ if (read_count)
+ goto nodata;
+
+ /*
+ * Wait for returned len to be >= 0 or -ENODATA.
+ */
+ error = wait_event_interruptible(
+ event_notifier_group->read_wait,
+ ((len = lib_ring_buffer_get_next_record(
+ chan, buf)), len != -EAGAIN));
+ CHAN_WARN_ON(chan, len == -EBUSY);
+ if (error) {
+ read_count = error;
+ goto nodata;
+ }
+ CHAN_WARN_ON(chan, len < 0 && len != -ENODATA);
+ goto len_test;
+ }
+ }
+ read_offset = buf->iter.read_offset;
+skip_get_next:
+ space_left = count - read_count;
+ if (len <= space_left) {
+ copy_len = len;
+ chan->iter.len_left = 0;
+ *ppos = 0;
+ } else {
+ copy_len = space_left;
+ chan->iter.len_left = len - copy_len;
+ *ppos = read_offset + copy_len;
+ }
+ if (__lib_ring_buffer_copy_to_user(&buf->backend, read_offset,
+ &user_buf[read_count],
+ copy_len)) {
+ /*
+ * Leave the len_left and ppos values at their current
+ * state, as we currently have a valid event to read.
+ */
+ return -EFAULT;
+ }
+ read_count += copy_len;
+ }
+ goto put_record;
+
+nodata:
+ *ppos = 0;
+ chan->iter.len_left = 0;
+
+put_record:
+ if (*ppos == 0)
+ lib_ring_buffer_put_current_record(buf);
+ return read_count;
+}
+
+/*
+ * If the ring buffer is non empty (even just a partial subbuffer), return that
+ * there is data available. Perform a ring buffer flush if we encounter a
+ * non-empty ring buffer which does not have any consumeable subbuffer available.
+ */
+static
+unsigned int lttng_event_notifier_group_notif_poll(struct file *filp,
+ poll_table *wait)
+{
+ unsigned int mask = 0;
+ struct lttng_event_notifier_group *event_notifier_group = filp->private_data;
+ struct lttng_kernel_ring_buffer_channel *chan = event_notifier_group->chan;
+ struct lttng_kernel_ring_buffer *buf = event_notifier_group->buf;
+ const struct lttng_kernel_ring_buffer_config *config = &chan->backend.config;
+ int finalized, disabled;
+ unsigned long consumed, offset;
+ size_t subbuffer_header_size = config->cb.subbuffer_header_size();
+
+ if (filp->f_mode & FMODE_READ) {
+ poll_wait_set_exclusive(wait);
+ poll_wait(filp, &event_notifier_group->read_wait, wait);
+
+ finalized = lib_ring_buffer_is_finalized(config, buf);
+ disabled = lib_ring_buffer_channel_is_disabled(chan);
+
+ /*
+ * lib_ring_buffer_is_finalized() contains a smp_rmb() ordering
+ * finalized load before offsets loads.
+ */
+ WARN_ON(atomic_long_read(&buf->active_readers) != 1);
+retry:
+ if (disabled)
+ return POLLERR;
+
+ offset = lib_ring_buffer_get_offset(config, buf);
+ consumed = lib_ring_buffer_get_consumed(config, buf);
+
+ /*
+ * If there is no buffer available to consume.
+ */
+ if (subbuf_trunc(offset, chan) - subbuf_trunc(consumed, chan) == 0) {
+ /*
+ * If there is a non-empty subbuffer, flush and try again.
+ */
+ if (subbuf_offset(offset, chan) > subbuffer_header_size) {
+ lib_ring_buffer_switch_remote(buf);
+ goto retry;
+ }
+
+ if (finalized)
+ return POLLHUP;
+ else {
+ /*
+ * The memory barriers
+ * __wait_event()/wake_up_interruptible() take
+ * care of "raw_spin_is_locked" memory ordering.
+ */
+ if (raw_spin_is_locked(&buf->raw_tick_nohz_spinlock))
+ goto retry;
+ else
+ return 0;
+ }
+ } else {
+ if (subbuf_trunc(offset, chan) - subbuf_trunc(consumed, chan)
+ >= chan->backend.buf_size)
+ return POLLPRI | POLLRDBAND;
+ else
+ return POLLIN | POLLRDNORM;
+ }
+ }
+
+ return mask;
+}
+
+/**
+ * lttng_event_notifier_group_notif_open - event_notifier ring buffer open file operation
+ * @inode: opened inode
+ * @file: opened file
+ *
+ * Open implementation. Makes sure only one open instance of a buffer is
+ * done at a given moment.
+ */
+static int lttng_event_notifier_group_notif_open(struct inode *inode, struct file *file)
+{
+ struct lttng_event_notifier_group *event_notifier_group = inode->i_private;
+ struct lttng_kernel_ring_buffer *buf = event_notifier_group->buf;
+
+ file->private_data = event_notifier_group;
+ return lib_ring_buffer_open(inode, file, buf);
+}
+
+/**
+ * lttng_event_notifier_group_notif_release - event_notifier ring buffer release file operation
+ * @inode: opened inode
+ * @file: opened file
+ *
+ * Release implementation.
+ */
+static int lttng_event_notifier_group_notif_release(struct inode *inode, struct file *file)
+{
+ struct lttng_event_notifier_group *event_notifier_group = file->private_data;
+ struct lttng_kernel_ring_buffer *buf = event_notifier_group->buf;
+ int ret;
+
+ ret = lib_ring_buffer_release(inode, file, buf);
+ if (ret)
+ return ret;
+ fput(event_notifier_group->file);
+ return 0;
+}
+
+static const struct file_operations lttng_event_notifier_group_notif_fops = {
+ .owner = THIS_MODULE,
+ .open = lttng_event_notifier_group_notif_open,
+ .release = lttng_event_notifier_group_notif_release,
+ .read = lttng_event_notifier_group_notif_read,
+ .poll = lttng_event_notifier_group_notif_poll,
+};
+
+/**
+ * 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
+unsigned int lttng_metadata_ring_buffer_poll(struct file *filp,
+ poll_table *wait)
+{
+ struct lttng_metadata_stream *stream = filp->private_data;
+ struct lttng_kernel_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 lttng_kernel_ring_buffer *buf = stream->priv;
+ unsigned int rb_cmd;
+ bool coherent;
+
+ if (cmd == LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK)
+ rb_cmd = LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF;
+ else
+ rb_cmd = cmd;
+
+ switch (cmd) {
+ case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF:
+ {
+ struct lttng_metadata_stream *stream = filp->private_data;
+ struct lttng_kernel_ring_buffer *buf = stream->priv;
+ struct lttng_kernel_ring_buffer_channel *chan = buf->backend.chan;
+
+ ret = lttng_metadata_output_channel(stream, chan, NULL);
+ if (ret > 0) {
+ lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE);
+ ret = 0;
+ } else if (ret < 0)
+ goto err;
+ break;
+ }
+ case LTTNG_KERNEL_ABI_RING_BUFFER_GET_SUBBUF:
+ {
+ /*
+ * Random access is not allowed for metadata channel.
+ */
+ return -ENOSYS;
+ }
+ case LTTNG_KERNEL_ABI_RING_BUFFER_FLUSH_EMPTY:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_RING_BUFFER_FLUSH:
+ {
+ struct lttng_metadata_stream *stream = filp->private_data;
+ struct lttng_kernel_ring_buffer *buf = stream->priv;
+ struct lttng_kernel_ring_buffer_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, NULL);
+ if (ret < 0)
+ goto err;
+ break;
+ }
+ case LTTNG_KERNEL_ABI_RING_BUFFER_GET_METADATA_VERSION:
+ {
+ struct lttng_metadata_stream *stream = filp->private_data;
+
+ return put_u64(stream->version, arg);
+ }
+ case LTTNG_KERNEL_ABI_RING_BUFFER_METADATA_CACHE_DUMP:
+ {
+ struct lttng_metadata_stream *stream = filp->private_data;
+
+ return lttng_metadata_cache_dump(stream);
+ }
+ case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK:
+ {
+ struct lttng_metadata_stream *stream = filp->private_data;
+ struct lttng_kernel_ring_buffer *buf = stream->priv;
+ struct lttng_kernel_ring_buffer_channel *chan = buf->backend.chan;
+
+ ret = lttng_metadata_output_channel(stream, chan, &coherent);
+ if (ret > 0) {
+ lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE);
+ ret = 0;
+ } else if (ret < 0) {
+ goto err;
+ }
+ break;
+ }
+ 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, rb_cmd, arg, buf);
+ if (ret < 0)
+ goto err;
+
+ switch (cmd) {
+ case LTTNG_KERNEL_ABI_RING_BUFFER_PUT_NEXT_SUBBUF:
+ {
+ lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp,
+ cmd, arg);
+ break;
+ }
+ case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK:
+ {
+ return put_u32(coherent, arg);
+ }
+ 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 lttng_kernel_ring_buffer *buf = stream->priv;
+ unsigned int rb_cmd;
+ bool coherent;
+
+ if (cmd == LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK)
+ rb_cmd = LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF;
+ else
+ rb_cmd = cmd;
+
+ switch (cmd) {
+ case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF:
+ {
+ struct lttng_metadata_stream *stream = filp->private_data;
+ struct lttng_kernel_ring_buffer *buf = stream->priv;
+ struct lttng_kernel_ring_buffer_channel *chan = buf->backend.chan;
+
+ ret = lttng_metadata_output_channel(stream, chan, NULL);
+ if (ret > 0) {
+ lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE);
+ ret = 0;
+ } else if (ret < 0)
+ goto err;
+ break;
+ }
+ case LTTNG_KERNEL_ABI_RING_BUFFER_GET_SUBBUF:
+ {
+ /*
+ * Random access is not allowed for metadata channel.
+ */
+ return -ENOSYS;
+ }
+ case LTTNG_KERNEL_ABI_RING_BUFFER_FLUSH_EMPTY:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_RING_BUFFER_FLUSH:
+ {
+ struct lttng_metadata_stream *stream = filp->private_data;
+ struct lttng_kernel_ring_buffer *buf = stream->priv;
+ struct lttng_kernel_ring_buffer_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, NULL);
+ if (ret < 0)
+ goto err;
+ break;
+ }
+ case LTTNG_KERNEL_ABI_RING_BUFFER_GET_METADATA_VERSION:
+ {
+ struct lttng_metadata_stream *stream = filp->private_data;
+
+ return put_u64(stream->version, arg);
+ }
+ case LTTNG_KERNEL_ABI_RING_BUFFER_METADATA_CACHE_DUMP:
+ {
+ struct lttng_metadata_stream *stream = filp->private_data;
+
+ return lttng_metadata_cache_dump(stream);
+ }
+ case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK:
+ {
+ struct lttng_metadata_stream *stream = filp->private_data;
+ struct lttng_kernel_ring_buffer *buf = stream->priv;
+ struct lttng_kernel_ring_buffer_channel *chan = buf->backend.chan;
+
+ ret = lttng_metadata_output_channel(stream, chan, &coherent);
+ if (ret > 0) {
+ lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE);
+ ret = 0;
+ } else if (ret < 0) {
+ goto err;
+ }
+ break;
+ }
+ 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, rb_cmd, arg, buf);
+ if (ret < 0)
+ goto err;
+
+ switch (cmd) {
+ case LTTNG_KERNEL_ABI_RING_BUFFER_PUT_NEXT_SUBBUF:
+ {
+ lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp,
+ cmd, arg);
+ break;
+ }
+ case LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK:
+ {
+ return put_u32(coherent, arg);
+ }
+ 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 lttng_kernel_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 "LTTng: 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 lttng_kernel_ring_buffer *buf = stream->priv;
+
+ mutex_lock(&stream->metadata_cache->lock);
+ list_del(&stream->node);
+ mutex_unlock(&stream->metadata_cache->lock);
+ kref_put(&stream->metadata_cache->refcount, metadata_cache_destroy);
+ module_put(stream->transport->owner);
+ kfree(stream);
+ 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 lttng_kernel_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 lttng_kernel_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, const char *name)
+{
+ int stream_fd, ret;
+ struct file *stream_file;
+
+ stream_fd = get_unused_fd_flags(0);
+ if (stream_fd < 0) {
+ ret = stream_fd;
+ goto fd_error;
+ }
+ stream_file = anon_inode_getfile(name, fops, stream_priv, O_RDWR);
+ if (IS_ERR(stream_file)) {
+ ret = PTR_ERR(stream_file);
+ goto file_error;
+ }
+ /*
+ * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor
+ * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this
+ * file descriptor, so we set FMODE_PREAD here.
+ */
+ stream_file->f_mode |= FMODE_PREAD;
+ fd_install(stream_fd, stream_file);
+ /*
+ * The stream holds a reference to the channel within the generic ring
+ * buffer library, so no need to hold a refcount on the channel and
+ * session files here.
+ */
+ return stream_fd;
+
+file_error:
+ put_unused_fd(stream_fd);
+fd_error:
+ return ret;
+}
+
+static
+int lttng_abi_open_stream(struct file *channel_file)
+{
+ struct lttng_kernel_channel_buffer *channel = channel_file->private_data;
+ struct lttng_kernel_ring_buffer *buf;
+ int ret;
+ void *stream_priv;
+
+ buf = channel->ops->priv->buffer_read_open(channel->priv->rb_chan);
+ if (!buf)
+ return -ENOENT;
+
+ stream_priv = buf;
+ ret = lttng_abi_create_stream_fd(channel_file, stream_priv,
+ <tng_stream_ring_buffer_file_operations,
+ "[lttng_stream]");
+ if (ret < 0)
+ goto fd_error;
+
+ return ret;
+
+fd_error:
+ channel->ops->priv->buffer_read_close(buf);
+ return ret;
+}
+
+static
+int lttng_abi_open_metadata_stream(struct file *channel_file)
+{
+ struct lttng_kernel_channel_buffer *channel = channel_file->private_data;
+ struct lttng_kernel_session *session = channel->parent.session;
+ struct lttng_kernel_ring_buffer *buf;
+ int ret;
+ struct lttng_metadata_stream *metadata_stream;
+ void *stream_priv;
+
+ buf = channel->ops->priv->buffer_read_open(channel->priv->rb_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->priv->metadata_cache;
+ init_waitqueue_head(&metadata_stream->read_wait);
+ metadata_stream->priv = buf;
+ stream_priv = metadata_stream;
+ metadata_stream->transport = channel->priv->transport;
+ /* Initial state is an empty metadata, considered as incoherent. */
+ metadata_stream->coherent = false;
+
+ /*
+ * 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 "LTTng: Can't lock transport module.\n");
+ ret = -EINVAL;
+ goto notransport;
+ }
+
+ if (!lttng_kref_get(&session->priv->metadata_cache->refcount)) {
+ ret = -EOVERFLOW;
+ goto kref_error;
+ }
+
+ ret = lttng_abi_create_stream_fd(channel_file, stream_priv,
+ <tng_metadata_ring_buffer_file_operations,
+ "[lttng_metadata_stream]");
+ if (ret < 0)
+ goto fd_error;
+
+ mutex_lock(&session->priv->metadata_cache->lock);
+ list_add(&metadata_stream->node,
+ &session->priv->metadata_cache->metadata_stream);
+ mutex_unlock(&session->priv->metadata_cache->lock);
+ return ret;
+
+fd_error:
+ kref_put(&session->priv->metadata_cache->refcount, metadata_cache_destroy);
+kref_error:
+ module_put(metadata_stream->transport->owner);
+notransport:
+ kfree(metadata_stream);
+nomem:
+ channel->ops->priv->buffer_read_close(buf);
+ return ret;
+}
+
+static
+int lttng_abi_open_event_notifier_group_stream(struct file *notif_file)
+{
+ struct lttng_event_notifier_group *event_notifier_group = notif_file->private_data;
+ struct lttng_kernel_ring_buffer_channel *chan = event_notifier_group->chan;
+ struct lttng_kernel_ring_buffer *buf;
+ int ret;
+ void *stream_priv;
+
+ buf = event_notifier_group->ops->priv->buffer_read_open(chan);
+ if (!buf)
+ return -ENOENT;
+
+ /* The event_notifier notification fd holds a reference on the event_notifier group */
+ if (!atomic_long_add_unless(¬if_file->f_count, 1, LONG_MAX)) {
+ ret = -EOVERFLOW;
+ goto refcount_error;
+ }
+ event_notifier_group->buf = buf;
+ stream_priv = event_notifier_group;
+ ret = lttng_abi_create_stream_fd(notif_file, stream_priv,
+ <tng_event_notifier_group_notif_fops,
+ "[lttng_event_notifier_stream]");
+ if (ret < 0)
+ goto fd_error;
+
+ return ret;
+
+fd_error:
+ atomic_long_dec(¬if_file->f_count);
+refcount_error:
+ event_notifier_group->ops->priv->buffer_read_close(buf);
+ return ret;
+}
+
+static
+int lttng_abi_validate_event_param(struct lttng_kernel_abi_event *event_param,
+ struct lttng_kernel_abi_event_ext *event_param_ext)
+{
+ enum lttng_kernel_abi_match_check match_check;
+
+ if (user_event_param_ext_get_match_check(event_param_ext, &match_check))
+ return -EINVAL;
+
+ /* Limit ABI to implemented features. */
+ switch (event_param->instrumentation) {
+ case LTTNG_KERNEL_ABI_SYSCALL:
+ switch (event_param->u.syscall.entryexit) {
+ case LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_SYSCALL_ENTRY:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_SYSCALL_EXIT:
+ break;
+ default:
+ return -EINVAL;
+ }
+ switch (event_param->u.syscall.abi) {
+ case LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL:
+ break;
+ default:
+ return -EINVAL;
+ }
+ switch (event_param->u.syscall.match) {
+ case LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME:
+ break;
+ default:
+ return -EINVAL;
+ }
+ switch (match_check) {
+ case LTTNG_KERNEL_ABI_MATCH_DEFAULT:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_MATCH_LAZY:
+ break;
+ default:
+ return -EINVAL;
+ }
+ break;
+
+ case LTTNG_KERNEL_ABI_KRETPROBE:
+ switch (event_param->u.kretprobe.entryexit) {
+ case LTTNG_KERNEL_ABI_KRETPROBE_ENTRYEXIT:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_KRETPROBE_ENTRY:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_KRETPROBE_EXIT:
+ break;
+ default:
+ return -EINVAL;
+ }
+ switch (match_check) {
+ case LTTNG_KERNEL_ABI_MATCH_DEFAULT:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_MATCH_IMMEDIATE:
+ break;
+ default:
+ return -EINVAL;
+ }
+ break;
+
+ case LTTNG_KERNEL_ABI_TRACEPOINT:
+ switch (match_check) {
+ case LTTNG_KERNEL_ABI_MATCH_DEFAULT:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_MATCH_LAZY:
+ break;
+ default:
+ return -EINVAL;
+ }
+ break;
+
+ case LTTNG_KERNEL_ABI_KPROBE:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_UPROBE:
+ switch (match_check) {
+ case LTTNG_KERNEL_ABI_MATCH_DEFAULT:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_MATCH_IMMEDIATE:
+ break;
+ default:
+ return -EINVAL;
+ }
+ break;
+
+ case LTTNG_KERNEL_ABI_FUNCTION:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_NOOP:
+ lttng_fallthrough;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static
+int lttng_abi_validate_event_match(struct lttng_kernel_abi_event *event_param,
+ struct lttng_kernel_abi_event_ext *event_param_ext)
+{
+ enum lttng_kernel_abi_match_check match_check;
+ int ret;
+
+ if (user_event_param_ext_get_match_check(event_param_ext, &match_check))
+ return -EINVAL;
+
+ /* Validate match */
+ if (match_check == LTTNG_KERNEL_ABI_MATCH_DEFAULT) {
+ switch (event_param->instrumentation) {
+ case LTTNG_KERNEL_ABI_TRACEPOINT:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_SYSCALL:
+ match_check = LTTNG_KERNEL_ABI_MATCH_LAZY;
+ break;
+ case LTTNG_KERNEL_ABI_KPROBE:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_KRETPROBE:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_UPROBE:
+ match_check = LTTNG_KERNEL_ABI_MATCH_IMMEDIATE;
+ break;
+
+ case LTTNG_KERNEL_ABI_FUNCTION:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_NOOP:
+ lttng_fallthrough;
+ default:
+ return -EINVAL;
+ }
+ }
+
+ if (match_check == LTTNG_KERNEL_ABI_MATCH_IMMEDIATE) {
+ switch (event_param->instrumentation) {
+ break;
+ case LTTNG_KERNEL_ABI_KPROBE:
+ ret = lttng_kprobes_match_check(event_param->u.kprobe.symbol_name,
+ event_param->u.kprobe.offset,
+ event_param->u.kprobe.addr);
+ if (ret)
+ return ret;
+ break;
+ case LTTNG_KERNEL_ABI_KRETPROBE:
+ ret = lttng_kretprobes_match_check(event_param->u.kretprobe.symbol_name,
+ event_param->u.kretprobe.offset,
+ event_param->u.kretprobe.addr);
+ if (ret)
+ return ret;
+ break;
+ case LTTNG_KERNEL_ABI_UPROBE:
+ /*
+ * uprobes are immediately created, which includes match checking.
+ */
+ break;
+
+ case LTTNG_KERNEL_ABI_TRACEPOINT:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_SYSCALL:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_FUNCTION:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_NOOP:
+ lttng_fallthrough;
+ default:
+ return -EINVAL;
+ }
+ }
+ return 0;
+}
+
+static
+int lttng_abi_create_event_recorder_enabler(struct file *channel_file,
+ struct lttng_kernel_abi_event *event_param,
+ struct lttng_kernel_abi_event_ext *event_param_ext)
+{
+ const struct file_operations *fops;
+ struct lttng_kernel_channel_buffer *channel = channel_file->private_data;
+ int event_fd, ret;
+ struct file *event_file;
+ void *priv;
+
+ event_param->name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0';
+ switch (event_param->instrumentation) {
+ case LTTNG_KERNEL_ABI_KRETPROBE:
+ event_param->u.kretprobe.symbol_name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0';
+ break;
+ case LTTNG_KERNEL_ABI_KPROBE:
+ event_param->u.kprobe.symbol_name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0';
+ break;
+ case LTTNG_KERNEL_ABI_FUNCTION:
+ WARN_ON_ONCE(1);
+ /* Not implemented. */
+ break;
+ default:
+ break;
+ }
+
+ switch (event_param->instrumentation) {
+ case LTTNG_KERNEL_ABI_TRACEPOINT:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_SYSCALL:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_KPROBE:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_KRETPROBE:
+ fops = <tng_event_session_enabler_fops;
+ break;
+
+ case LTTNG_KERNEL_ABI_UPROBE:
+ fops = <tng_event_session_fops;
+ break;
+
+ case LTTNG_KERNEL_ABI_FUNCTION:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_NOOP:
+ lttng_fallthrough;
+ default:
+ return -EINVAL;
+ }
+
+ event_fd = get_unused_fd_flags(0);
+ if (event_fd < 0) {
+ ret = event_fd;
+ goto fd_error;
+ }
+ event_file = anon_inode_getfile("[lttng_event_recorder]",
+ 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, LONG_MAX)) {
+ ret = -EOVERFLOW;
+ goto refcount_error;
+ }
+ ret = lttng_abi_validate_event_param(event_param, event_param_ext);
+ if (ret)
+ goto event_error;
+ ret = lttng_abi_validate_event_match(event_param, event_param_ext);
+ if (ret)
+ goto event_error;
+
+ switch (event_param->instrumentation) {
+ case LTTNG_KERNEL_ABI_TRACEPOINT:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_SYSCALL:
+ {
+ struct lttng_event_recorder_enabler *event_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.
+ */
+ event_enabler = lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_STAR_GLOB,
+ event_param, channel);
+ } else {
+ event_enabler = lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME,
+ event_param, channel);
+ }
+ if (event_enabler)
+ lttng_event_enabler_session_add(channel->parent.session, &event_enabler->parent);
+ priv = event_enabler;
+ break;
+ }
+
+ case LTTNG_KERNEL_ABI_KPROBE:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_KRETPROBE:
+ {
+ struct lttng_event_recorder_enabler *event_enabler;
+
+ event_enabler = lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME,
+ event_param, channel);
+ if (event_enabler)
+ lttng_event_enabler_session_add(channel->parent.session, &event_enabler->parent);
+ priv = event_enabler;
+ break;
+ }
- switch (cmd) {
- case RING_BUFFER_PUT_NEXT_SUBBUF:
+ case LTTNG_KERNEL_ABI_UPROBE:
{
- lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp,
- cmd, arg);
+ struct lttng_kernel_event_common *event;
+ struct lttng_event_recorder_enabler *event_enabler;
+
+ event_enabler = lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME,
+ event_param, channel);
+ if (!event_enabler) {
+ ret = -ENOMEM;
+ goto event_error;
+ }
+ /*
+ * We tolerate no failure path after event creation. It
+ * will stay invariant for the rest of the session.
+ */
+ event = lttng_kernel_event_create(&event_enabler->parent.parent, NULL, NULL);
+ lttng_event_enabler_destroy(&event_enabler->parent.parent);
+ if (IS_ERR(event)) {
+ ret = PTR_ERR(event);
+ goto event_error;
+ }
+ priv = event;
break;
}
+
+ case LTTNG_KERNEL_ABI_FUNCTION:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_NOOP:
+ lttng_fallthrough;
default:
- break;
+ ret = -EINVAL;
+ goto event_error;
}
-err:
+ 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);
+fd_error:
return ret;
}
-#ifdef CONFIG_COMPAT
static
-long lttng_metadata_ring_buffer_compat_ioctl(struct file *filp,
- unsigned int cmd, unsigned long arg)
+int lttng_abi_create_event_counter_enabler(struct file *channel_file,
+ struct lttng_kernel_counter_event *counter_event)
{
- int ret;
- struct lttng_metadata_stream *stream = filp->private_data;
- struct lib_ring_buffer *buf = stream->priv;
+ const struct file_operations *fops;
+ struct lttng_kernel_channel_counter *channel = channel_file->private_data;
+ struct lttng_kernel_abi_event *event_param = &counter_event->event_param;
+ struct lttng_kernel_abi_event_ext *event_param_ext = &counter_event->event_param_ext;
+ struct lttng_kernel_counter_key *counter_key = counter_event->counter_key;
+ int event_fd, ret;
+ struct file *event_file;
+ void *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;
+ event_param->name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0';
+ switch (event_param->instrumentation) {
+ case LTTNG_KERNEL_ABI_KRETPROBE:
+ event_param->u.kretprobe.symbol_name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0';
+ break;
+ case LTTNG_KERNEL_ABI_KPROBE:
+ event_param->u.kprobe.symbol_name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0';
+ break;
+ case LTTNG_KERNEL_ABI_FUNCTION:
+ WARN_ON_ONCE(1);
+ /* Not implemented. */
+ break;
+ default:
+ break;
+ }
- 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;
+ switch (event_param->instrumentation) {
+ case LTTNG_KERNEL_ABI_TRACEPOINT:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_SYSCALL:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_KPROBE:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_KRETPROBE:
+ fops = <tng_event_session_enabler_fops;
+ break;
+
+ case LTTNG_KERNEL_ABI_UPROBE:
+ fops = <tng_event_session_fops;
break;
+
+ case LTTNG_KERNEL_ABI_FUNCTION:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_NOOP:
+ lttng_fallthrough;
+ default:
+ return -EINVAL;
}
- case RING_BUFFER_GET_SUBBUF:
- {
- /*
- * Random access is not allowed for metadata channel.
- */
- return -ENOSYS;
+
+ event_fd = get_unused_fd_flags(0);
+ if (event_fd < 0) {
+ ret = event_fd;
+ goto fd_error;
+ }
+ event_file = anon_inode_getfile("[lttng_event_counter]",
+ 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, LONG_MAX)) {
+ ret = -EOVERFLOW;
+ goto refcount_error;
}
- case RING_BUFFER_FLUSH_EMPTY: /* Fall-through. */
- case RING_BUFFER_FLUSH:
+ ret = lttng_abi_validate_event_param(event_param, event_param_ext);
+ if (ret)
+ goto event_error;
+ ret = lttng_abi_validate_event_match(event_param, event_param_ext);
+ if (ret)
+ goto event_error;
+
+ switch (event_param->instrumentation) {
+ case LTTNG_KERNEL_ABI_TRACEPOINT:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_SYSCALL:
{
- struct lttng_metadata_stream *stream = filp->private_data;
- struct lib_ring_buffer *buf = stream->priv;
- struct channel *chan = buf->backend.chan;
+ struct lttng_event_counter_enabler *event_enabler;
- /*
- * 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;
+ 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.
+ */
+ event_enabler = lttng_event_counter_enabler_create(LTTNG_ENABLER_FORMAT_STAR_GLOB,
+ event_param, counter_key, channel);
+ } else {
+ event_enabler = lttng_event_counter_enabler_create(LTTNG_ENABLER_FORMAT_NAME,
+ event_param, counter_key, channel);
+ }
+ if (event_enabler)
+ lttng_event_enabler_session_add(channel->parent.session, &event_enabler->parent);
+ priv = event_enabler;
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:
+ case LTTNG_KERNEL_ABI_KPROBE:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_KRETPROBE:
{
- struct lttng_metadata_stream *stream = filp->private_data;
+ struct lttng_event_counter_enabler *event_enabler;
- return lttng_metadata_cache_dump(stream);
- }
- default:
+ event_enabler = lttng_event_counter_enabler_create(LTTNG_ENABLER_FORMAT_NAME,
+ event_param, counter_key, channel);
+ if (event_enabler)
+ lttng_event_enabler_session_add(channel->parent.session, &event_enabler->parent);
+ priv = event_enabler;
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:
+ case LTTNG_KERNEL_ABI_UPROBE:
{
- lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp,
- cmd, arg);
+ struct lttng_kernel_event_common *event;
+ struct lttng_event_counter_enabler *event_enabler;
+
+ event_enabler = lttng_event_counter_enabler_create(LTTNG_ENABLER_FORMAT_NAME,
+ event_param, counter_key, channel);
+ if (!event_enabler) {
+ ret = -ENOMEM;
+ goto event_error;
+ }
+ /*
+ * We tolerate no failure path after event creation. It
+ * will stay invariant for the rest of the session.
+ */
+ event = lttng_kernel_event_create(&event_enabler->parent.parent, NULL, NULL);
+ lttng_event_enabler_destroy(&event_enabler->parent.parent);
+ if (IS_ERR(event)) {
+ ret = PTR_ERR(event);
+ goto event_error;
+ }
+ priv = event;
break;
}
+
+ case LTTNG_KERNEL_ABI_FUNCTION:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_NOOP:
+ lttng_fallthrough;
default:
- break;
+ ret = -EINVAL;
+ goto event_error;
}
-err:
+ 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);
+fd_error:
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)
+long lttng_event_notifier_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
- struct lttng_metadata_stream *stream = inode->i_private;
- struct lib_ring_buffer *buf = stream->priv;
+ struct lttng_kernel_event_common *event = file->private_data;
- 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;
+ switch (cmd) {
+ case LTTNG_KERNEL_ABI_ENABLE:
+ return lttng_event_enable(event);
+ case LTTNG_KERNEL_ABI_DISABLE:
+ return lttng_event_disable(event);
+ case LTTNG_KERNEL_ABI_FILTER:
+ return -EINVAL;
+ case LTTNG_KERNEL_ABI_CAPTURE:
+ return -EINVAL;
+ case LTTNG_KERNEL_ABI_ADD_CALLSITE:
+ return lttng_event_add_callsite(event,
+ (struct lttng_kernel_abi_event_callsite __user *) arg);
+ default:
+ return -ENOIOCTLCMD;
}
- return lib_ring_buffer_open(inode, file, buf);
}
static
-int lttng_metadata_ring_buffer_release(struct inode *inode, struct file *file)
+long lttng_event_notifier_enabler_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
- struct lttng_metadata_stream *stream = file->private_data;
- struct lib_ring_buffer *buf = stream->priv;
+ struct lttng_event_enabler_common *event = file->private_data;
- kref_put(&stream->metadata_cache->refcount, metadata_cache_destroy);
- module_put(stream->transport->owner);
- return lib_ring_buffer_release(inode, file, buf);
+ switch (cmd) {
+ case LTTNG_KERNEL_ABI_ENABLE:
+ return lttng_event_enabler_enable(event);
+ case LTTNG_KERNEL_ABI_DISABLE:
+ return lttng_event_enabler_disable(event);
+ case LTTNG_KERNEL_ABI_FILTER:
+ return lttng_event_enabler_attach_filter_bytecode(event,
+ (struct lttng_kernel_abi_filter_bytecode __user *) arg);
+ case LTTNG_KERNEL_ABI_CAPTURE:
+ {
+ struct lttng_event_notifier_enabler *event_notifier_enabler =
+ container_of(event, struct lttng_event_notifier_enabler, parent);
+ return lttng_event_notifier_enabler_attach_capture_bytecode(
+ event_notifier_enabler,
+ (struct lttng_kernel_abi_capture_bytecode __user *) arg);
+ }
+ case LTTNG_KERNEL_ABI_ADD_CALLSITE:
+ return -EINVAL;
+ default:
+ return -ENOIOCTLCMD;
+ }
}
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)
+int lttng_event_notifier_event_release(struct inode *inode, struct file *file)
{
- struct lttng_metadata_stream *stream = in->private_data;
- struct lib_ring_buffer *buf = stream->priv;
+ struct lttng_kernel_event_common *event = file->private_data;
- return lib_ring_buffer_splice_read(in, ppos, pipe, len,
- flags, buf);
+ if (event) {
+ struct lttng_kernel_event_notifier *event_notifier =
+ container_of(event, struct lttng_kernel_event_notifier, parent);
+ fput(event_notifier->priv->group->file);
+ }
+ return 0;
}
static
-int lttng_metadata_ring_buffer_mmap(struct file *filp,
- struct vm_area_struct *vma)
+int lttng_event_notifier_enabler_release(struct inode *inode, struct file *file)
{
- struct lttng_metadata_stream *stream = filp->private_data;
- struct lib_ring_buffer *buf = stream->priv;
+ struct lttng_event_enabler_common *event_enabler = file->private_data;
- return lib_ring_buffer_mmap(filp, vma, buf);
+ if (event_enabler) {
+ struct lttng_event_notifier_enabler *event_notifier_enabler =
+ container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
+ fput(event_notifier_enabler->group->file);
+ }
+ return 0;
}
-static
-const struct file_operations lttng_metadata_ring_buffer_file_operations = {
+static const struct file_operations lttng_event_notifier_event_fops = {
.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,
+ .release = lttng_event_notifier_event_release,
+ .unlocked_ioctl = lttng_event_notifier_event_ioctl,
#ifdef CONFIG_COMPAT
- .compat_ioctl = lttng_metadata_ring_buffer_compat_ioctl,
+ .compat_ioctl = lttng_event_notifier_event_ioctl,
+#endif
+};
+
+static const struct file_operations lttng_event_notifier_enabler_fops = {
+ .owner = THIS_MODULE,
+ .release = lttng_event_notifier_enabler_release,
+ .unlocked_ioctl = lttng_event_notifier_enabler_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = lttng_event_notifier_enabler_ioctl,
#endif
};
static
-int lttng_abi_create_stream_fd(struct file *channel_file, void *stream_priv,
- const struct file_operations *fops)
+int lttng_abi_create_event_notifier(struct file *event_notifier_group_file,
+ struct lttng_kernel_abi_event_notifier *event_notifier_param,
+ struct lttng_kernel_abi_event_ext *event_param_ext)
{
- int stream_fd, ret;
- struct file *stream_file;
+ struct lttng_event_notifier_group *event_notifier_group =
+ event_notifier_group_file->private_data;
+ const struct file_operations *fops;
+ int event_notifier_fd, ret;
+ struct file *event_notifier_file;
+ void *priv;
- stream_fd = lttng_get_unused_fd();
- if (stream_fd < 0) {
- ret = stream_fd;
+ switch (event_notifier_param->event.instrumentation) {
+ case LTTNG_KERNEL_ABI_TRACEPOINT:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_SYSCALL:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_KPROBE:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_KRETPROBE:
+ fops = <tng_event_notifier_enabler_fops;
+ break;
+
+ case LTTNG_KERNEL_ABI_UPROBE:
+ fops = <tng_event_notifier_event_fops;
+ break;
+
+ case LTTNG_KERNEL_ABI_FUNCTION:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_NOOP:
+ lttng_fallthrough;
+ default:
+ ret = -EINVAL;
+ goto inval_instr;
+ }
+
+ event_notifier_param->event.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0';
+ switch (event_notifier_param->event.instrumentation) {
+ case LTTNG_KERNEL_ABI_KRETPROBE:
+ event_notifier_param->event.u.kretprobe.symbol_name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0';
+ break;
+ case LTTNG_KERNEL_ABI_KPROBE:
+ event_notifier_param->event.u.kprobe.symbol_name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0';
+ break;
+ default:
+ break;
+ }
+
+ event_notifier_fd = get_unused_fd_flags(0);
+ if (event_notifier_fd < 0) {
+ ret = event_notifier_fd;
goto fd_error;
}
- 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;
+
+ event_notifier_file = anon_inode_getfile("[lttng_event_notifier]",
+ fops, NULL, O_RDWR);
+ if (IS_ERR(event_notifier_file)) {
+ ret = PTR_ERR(event_notifier_file);
+ goto file_error;
+ }
+
+ /* The event notifier holds a reference on the event notifier group. */
+ if (!atomic_long_add_unless(&event_notifier_group_file->f_count, 1, LONG_MAX)) {
+ ret = -EOVERFLOW;
+ goto refcount_error;
+ }
+
+ ret = lttng_abi_validate_event_param(&event_notifier_param->event, event_param_ext);
+ if (ret)
+ goto event_notifier_error;
+ ret = lttng_abi_validate_event_match(&event_notifier_param->event, event_param_ext);
+ if (ret)
+ goto event_notifier_error;
+
+ switch (event_notifier_param->event.instrumentation) {
+ case LTTNG_KERNEL_ABI_TRACEPOINT:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_SYSCALL:
+ {
+ struct lttng_event_notifier_enabler *enabler;
+
+ if (strutils_is_star_glob_pattern(event_notifier_param->event.name)) {
+ /*
+ * If the event name is a star globbing pattern,
+ * we create the special star globbing enabler.
+ */
+ enabler = lttng_event_notifier_enabler_create(
+ LTTNG_ENABLER_FORMAT_STAR_GLOB,
+ event_notifier_param,
+ event_notifier_group);
+ } else {
+ enabler = lttng_event_notifier_enabler_create(
+ LTTNG_ENABLER_FORMAT_NAME,
+ event_notifier_param,
+ event_notifier_group);
+ }
+ if (enabler)
+ lttng_event_notifier_enabler_group_add(event_notifier_group, enabler);
+ priv = enabler;
+ break;
+ }
+
+ case LTTNG_KERNEL_ABI_KPROBE:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_KRETPROBE:
+ {
+ struct lttng_event_notifier_enabler *enabler;
+
+ enabler = lttng_event_notifier_enabler_create(LTTNG_ENABLER_FORMAT_NAME,
+ event_notifier_param, event_notifier_group);
+ if (enabler)
+ lttng_event_notifier_enabler_group_add(event_notifier_group, enabler);
+ priv = enabler;
+ break;
+ }
+
+ case LTTNG_KERNEL_ABI_UPROBE:
+ {
+ struct lttng_kernel_event_common *event;
+ struct lttng_event_notifier_enabler *event_notifier_enabler;
+
+ event_notifier_enabler = lttng_event_notifier_enabler_create(LTTNG_ENABLER_FORMAT_NAME,
+ event_notifier_param, event_notifier_group);
+ if (!event_notifier_enabler) {
+ ret = -ENOMEM;
+ goto event_notifier_error;
+ }
+ event = lttng_kernel_event_create(&event_notifier_enabler->parent, NULL, NULL);
+ lttng_event_enabler_destroy(&event_notifier_enabler->parent);
+ if (IS_ERR(event)) {
+ ret = PTR_ERR(event);
+ goto event_notifier_error;
+ }
+ priv = event;
+ break;
+ }
+
+ case LTTNG_KERNEL_ABI_FUNCTION:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_NOOP:
+ lttng_fallthrough;
+ default:
+ ret = -EINVAL;
+ goto event_notifier_error;
}
- /*
- * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor
- * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this
- * file descriptor, so we set FMODE_PREAD here.
- */
- stream_file->f_mode |= FMODE_PREAD;
- fd_install(stream_fd, stream_file);
- /*
- * The stream holds a reference to the channel within the generic ring
- * buffer library, so no need to hold a refcount on the channel and
- * session files here.
- */
- return stream_fd;
+ event_notifier_file->private_data = priv;
+ fd_install(event_notifier_fd, event_notifier_file);
+ return event_notifier_fd;
+event_notifier_error:
+ atomic_long_dec(&event_notifier_group_file->f_count);
+refcount_error:
+ fput(event_notifier_file);
file_error:
- put_unused_fd(stream_fd);
+ put_unused_fd(event_notifier_fd);
fd_error:
+inval_instr:
return ret;
}
static
-int lttng_abi_open_stream(struct file *channel_file)
+long lttng_abi_session_create_counter(
+ struct lttng_kernel_session *session,
+ const struct lttng_kernel_counter_conf *counter_conf)
{
- 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;
+ int counter_fd, ret;
+ char *counter_transport_name;
+ struct lttng_kernel_channel_counter *chan_counter = NULL;
+ struct file *counter_file;
- 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;
+ if (counter_conf->arithmetic != LTTNG_KERNEL_COUNTER_ARITHMETIC_MODULAR) {
+ printk(KERN_ERR "LTTng: Maps: Counter of the wrong arithmetic type.\n");
+ return -EINVAL;
+ }
- return ret;
+ switch (counter_conf->bitness) {
+ case LTTNG_KERNEL_COUNTER_BITNESS_64:
+ counter_transport_name = "counter-per-cpu-64-modular";
+ break;
+ case LTTNG_KERNEL_COUNTER_BITNESS_32:
+ counter_transport_name = "counter-per-cpu-32-modular";
+ break;
+ default:
+ return -EINVAL;
+ }
-fd_error:
- channel->ops->buffer_read_close(buf);
- return ret;
-}
+ lttng_lock_sessions();
-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;
+ counter_fd = get_unused_fd_flags(0);
+ if (counter_fd < 0) {
+ ret = counter_fd;
+ goto fd_error;
+ }
- buf = channel->ops->buffer_read_open(channel->chan);
- if (!buf)
- return -ENOENT;
+ counter_file = anon_inode_getfile("[lttng_counter]",
+ <tng_counter_fops,
+ NULL, O_RDONLY);
+ if (IS_ERR(counter_file)) {
+ ret = PTR_ERR(counter_file);
+ goto file_error;
+ }
- metadata_stream = kzalloc(sizeof(struct lttng_metadata_stream),
- GFP_KERNEL);
- if (!metadata_stream) {
- ret = -ENOMEM;
- goto nomem;
+ if (!atomic_long_add_unless(&session->priv->file->f_count, 1, LONG_MAX)) {
+ ret = -EOVERFLOW;
+ goto refcount_error;
}
- 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");
+ chan_counter = lttng_kernel_counter_create(counter_transport_name, 1, counter_conf->dimension_array, 0,
+ counter_conf->flags & LTTNG_KERNEL_COUNTER_CONF_FLAG_COALESCE_HITS);
+ if (!chan_counter) {
ret = -EINVAL;
- goto notransport;
+ goto create_error;
}
- if (!lttng_kref_get(&session->metadata_cache->refcount)) {
- ret = -EOVERFLOW;
- goto kref_error;
- }
+ chan_counter->priv->parent.file = counter_file;
+ chan_counter->priv->owner = session->priv->file;
+ chan_counter->parent.session = session;
+ list_add(&chan_counter->priv->parent.node, &session->priv->chan_head);
+ counter_file->private_data = chan_counter;
- ret = lttng_abi_create_stream_fd(channel_file, stream_priv,
- <tng_metadata_ring_buffer_file_operations);
- if (ret < 0)
- goto fd_error;
+ fd_install(counter_fd, counter_file);
+ lttng_unlock_sessions();
- list_add(&metadata_stream->list,
- &session->metadata_cache->metadata_stream);
- return ret;
+ return counter_fd;
+create_error:
+ atomic_long_dec(&session->priv->file->f_count);
+refcount_error:
+ fput(counter_file);
+file_error:
+ put_unused_fd(counter_fd);
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);
+ lttng_unlock_sessions();
return ret;
}
static
-int lttng_abi_create_event(struct file *channel_file,
- struct lttng_kernel_event *event_param)
+long lttng_abi_event_notifier_group_create_error_counter(
+ struct file *event_notifier_group_file,
+ const struct lttng_kernel_counter_conf *counter_conf)
{
- struct lttng_channel *channel = channel_file->private_data;
- int event_fd, ret;
- struct file *event_file;
- void *priv;
+ int counter_fd, ret;
+ char *counter_transport_name;
+ struct lttng_kernel_channel_counter *chan_counter = NULL;
+ struct file *counter_file;
+ struct lttng_event_notifier_group *event_notifier_group =
+ (struct lttng_event_notifier_group *) event_notifier_group_file->private_data;
+ size_t counter_len;
+
+ if (counter_conf->arithmetic != LTTNG_KERNEL_COUNTER_ARITHMETIC_MODULAR) {
+ printk(KERN_ERR "LTTng: event_notifier: Error counter of the wrong arithmetic type.\n");
+ return -EINVAL;
+ }
- 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';
- break;
- case LTTNG_KERNEL_KPROBE:
- event_param->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
+ switch (counter_conf->bitness) {
+ case LTTNG_KERNEL_COUNTER_BITNESS_64:
+ counter_transport_name = "counter-per-cpu-64-modular";
break;
- case LTTNG_KERNEL_FUNCTION:
- WARN_ON_ONCE(1);
- /* Not implemented. */
+ case LTTNG_KERNEL_COUNTER_BITNESS_32:
+ counter_transport_name = "counter-per-cpu-32-modular";
break;
default:
- break;
+ return -EINVAL;
}
- event_fd = lttng_get_unused_fd();
- if (event_fd < 0) {
- ret = event_fd;
+
+ /*
+ * Lock sessions to provide mutual exclusion against concurrent
+ * modification of event_notifier group, which would result in
+ * overwriting the error counter if set concurrently.
+ */
+ lttng_lock_sessions();
+
+ if (event_notifier_group->error_counter) {
+ printk(KERN_ERR "Error counter already created in event_notifier group\n");
+ ret = -EBUSY;
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);
+
+ counter_fd = get_unused_fd_flags(0);
+ if (counter_fd < 0) {
+ ret = counter_fd;
+ goto fd_error;
+ }
+
+ counter_file = anon_inode_getfile("[lttng_counter]",
+ <tng_counter_fops,
+ NULL, O_RDONLY);
+ if (IS_ERR(counter_file)) {
+ ret = PTR_ERR(counter_file);
goto file_error;
}
- /* The event holds a reference on the channel */
- if (!atomic_long_add_unless(&channel_file->f_count, 1, LONG_MAX)) {
+
+ if (!atomic_long_add_unless(&event_notifier_group_file->f_count, 1, LONG_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,
- event_param->instrumentation);
- WARN_ON_ONCE(!event);
- if (IS_ERR(event)) {
- ret = PTR_ERR(event);
- goto event_error;
- }
- priv = event;
+ counter_len = counter_conf->dimension_array[0].size;
+ chan_counter = lttng_kernel_counter_create(counter_transport_name, 1, counter_conf->dimension_array, 0, false);
+ if (!chan_counter) {
+ ret = -EINVAL;
+ goto create_error;
}
- event_file->private_data = priv;
- fd_install(event_fd, event_file);
- return event_fd;
-event_error:
- atomic_long_dec(&channel_file->f_count);
+ chan_counter->priv->parent.file = counter_file;
+ chan_counter->priv->owner = event_notifier_group->file;
+ counter_file->private_data = chan_counter;
+ event_notifier_group->error_counter_len = counter_len;
+ /*
+ * store-release to publish error counter matches load-acquire
+ * in record_error. Ensures the counter is created and the
+ * error_counter_len is set before they are used.
+ */
+ smp_store_release(&event_notifier_group->error_counter,
+ chan_counter);
+
+ fd_install(counter_fd, counter_file);
+ lttng_unlock_sessions();
+
+ return counter_fd;
+
+create_error:
+ atomic_long_dec(&event_notifier_group_file->f_count);
refcount_error:
- fput(event_file);
+ fput(counter_file);
file_error:
- put_unused_fd(event_fd);
+ put_unused_fd(counter_fd);
fd_error:
+ lttng_unlock_sessions();
return ret;
}
+static
+long lttng_event_notifier_group_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ int ret;
+
+ switch (cmd) {
+ case LTTNG_KERNEL_ABI_EVENT_NOTIFIER_GROUP_NOTIFICATION_FD:
+ {
+ return lttng_abi_open_event_notifier_group_stream(file);
+ }
+ case LTTNG_KERNEL_ABI_EVENT_NOTIFIER_CREATE:
+ {
+ struct lttng_kernel_abi_event_notifier uevent_notifier_param;
+ struct lttng_kernel_abi_event_ext uevent_param_ext = {};
+ int ret;
+
+ if (copy_from_user(&uevent_notifier_param,
+ (struct lttng_kernel_abi_event_notifier __user *) arg,
+ sizeof(uevent_notifier_param)))
+ return -EFAULT;
+ ret = copy_user_event_param_ext(&uevent_param_ext, &uevent_notifier_param.event);
+ if (ret)
+ return ret;
+ return lttng_abi_create_event_notifier(file, &uevent_notifier_param, &uevent_param_ext);
+ }
+ case LTTNG_KERNEL_ABI_OLD_COUNTER:
+ {
+ struct lttng_kernel_counter_conf counter_conf;
+
+ ret = lttng_abi_copy_user_old_counter_conf(&counter_conf,
+ (struct lttng_kernel_abi_old_counter_conf __user *) arg);
+ if (ret)
+ return ret;
+ return lttng_abi_event_notifier_group_create_error_counter(file, &counter_conf);
+ }
+ case LTTNG_KERNEL_ABI_COUNTER:
+ {
+ struct lttng_kernel_counter_conf counter_conf;
+
+ ret = lttng_abi_copy_user_counter_conf(&counter_conf,
+ (struct lttng_kernel_abi_counter_conf __user *) arg);
+ if (ret)
+ return ret;
+ return lttng_abi_event_notifier_group_create_error_counter(file, &counter_conf);
+ }
+ default:
+ return -ENOIOCTLCMD;
+ }
+ return 0;
+}
+
+static
+int lttng_event_notifier_group_release(struct inode *inode, struct file *file)
+{
+ struct lttng_event_notifier_group *event_notifier_group =
+ file->private_data;
+
+ if (event_notifier_group)
+ lttng_event_notifier_group_destroy(event_notifier_group);
+ return 0;
+}
+
+static const struct file_operations lttng_event_notifier_group_fops = {
+ .owner = THIS_MODULE,
+ .release = lttng_event_notifier_group_release,
+ .unlocked_ioctl = lttng_event_notifier_group_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = lttng_event_notifier_group_ioctl,
+#endif
+};
+
/**
* lttng_channel_ioctl - lttng syscall through ioctl
*
* @arg: command arg
*
* This ioctl implements lttng commands:
- * LTTNG_KERNEL_STREAM
+ * LTTNG_KERNEL_ABI_STREAM
* Returns an event stream file descriptor or failure.
* (typically, one event stream records events from one CPU)
- * LTTNG_KERNEL_EVENT
+ * LTTNG_KERNEL_ABI_EVENT
* Returns an event file descriptor or failure.
- * LTTNG_KERNEL_CONTEXT
+ * LTTNG_KERNEL_ABI_CONTEXT
* Prepend a context field to each event in the channel
- * LTTNG_KERNEL_ENABLE
+ * LTTNG_KERNEL_ABI_ENABLE
* Enable recording for events in this channel (weak enable)
- * LTTNG_KERNEL_DISABLE
+ * LTTNG_KERNEL_ABI_DISABLE
* Disable recording for events in this channel (strong disable)
*
* Channel and event file descriptors also hold a reference on the session.
static
long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
- struct lttng_channel *channel = file->private_data;
+ struct lttng_kernel_channel_buffer *channel = file->private_data;
switch (cmd) {
- case LTTNG_KERNEL_OLD_STREAM:
- case LTTNG_KERNEL_STREAM:
+ case LTTNG_KERNEL_ABI_OLD_STREAM:
+ case LTTNG_KERNEL_ABI_STREAM:
return lttng_abi_open_stream(file);
- case LTTNG_KERNEL_OLD_EVENT:
+ case LTTNG_KERNEL_ABI_OLD_EVENT:
{
- struct lttng_kernel_event *uevent_param;
- struct lttng_kernel_old_event *old_uevent_param;
+ struct lttng_kernel_abi_event *uevent_param;
+ struct lttng_kernel_abi_old_event *old_uevent_param;
int ret;
- uevent_param = kmalloc(sizeof(struct lttng_kernel_event),
+ uevent_param = kmalloc(sizeof(struct lttng_kernel_abi_event),
GFP_KERNEL);
if (!uevent_param) {
ret = -ENOMEM;
goto old_event_end;
}
old_uevent_param = kmalloc(
- sizeof(struct lttng_kernel_old_event),
+ sizeof(struct lttng_kernel_abi_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))) {
+ (struct lttng_kernel_abi_old_event __user *) arg,
+ sizeof(struct lttng_kernel_abi_old_event))) {
ret = -EFAULT;
goto old_event_error_free_old_param;
}
old_uevent_param->instrumentation;
switch (old_uevent_param->instrumentation) {
- case LTTNG_KERNEL_KPROBE:
+ case LTTNG_KERNEL_ABI_KPROBE:
uevent_param->u.kprobe.addr =
old_uevent_param->u.kprobe.addr;
uevent_param->u.kprobe.offset =
old_uevent_param->u.kprobe.symbol_name,
sizeof(uevent_param->u.kprobe.symbol_name));
break;
- case LTTNG_KERNEL_KRETPROBE:
+ case LTTNG_KERNEL_ABI_KRETPROBE:
uevent_param->u.kretprobe.addr =
old_uevent_param->u.kretprobe.addr;
uevent_param->u.kretprobe.offset =
old_uevent_param->u.kretprobe.symbol_name,
sizeof(uevent_param->u.kretprobe.symbol_name));
break;
- case LTTNG_KERNEL_FUNCTION:
+ case LTTNG_KERNEL_ABI_FUNCTION:
WARN_ON_ONCE(1);
/* Not implemented. */
break;
default:
break;
}
- ret = lttng_abi_create_event(file, uevent_param);
+ ret = lttng_abi_create_event_recorder_enabler(file, uevent_param, NULL);
old_event_error_free_old_param:
kfree(old_uevent_param);
old_event_end:
return ret;
}
- case LTTNG_KERNEL_EVENT:
+ case LTTNG_KERNEL_ABI_EVENT:
{
- struct lttng_kernel_event uevent_param;
+ struct lttng_kernel_abi_event uevent_param;
+ struct lttng_kernel_abi_event_ext uevent_param_ext = {};
+ int ret;
if (copy_from_user(&uevent_param,
- (struct lttng_kernel_event __user *) arg,
+ (struct lttng_kernel_abi_event __user *) arg,
sizeof(uevent_param)))
return -EFAULT;
- return lttng_abi_create_event(file, &uevent_param);
+ ret = copy_user_event_param_ext(&uevent_param_ext, &uevent_param);
+ if (ret)
+ return ret;
+ return lttng_abi_create_event_recorder_enabler(file, &uevent_param, &uevent_param_ext);
}
- case LTTNG_KERNEL_OLD_CONTEXT:
+ case LTTNG_KERNEL_ABI_OLD_CONTEXT:
{
- struct lttng_kernel_context *ucontext_param;
- struct lttng_kernel_old_context *old_ucontext_param;
+ struct lttng_kernel_abi_context *ucontext_param;
+ struct lttng_kernel_abi_old_context *old_ucontext_param;
int ret;
- ucontext_param = kmalloc(sizeof(struct lttng_kernel_context),
+ ucontext_param = kmalloc(sizeof(struct lttng_kernel_abi_context),
GFP_KERNEL);
if (!ucontext_param) {
ret = -ENOMEM;
goto old_ctx_end;
}
- old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_old_context),
+ old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_abi_old_context),
GFP_KERNEL);
if (!old_ucontext_param) {
ret = -ENOMEM;
}
if (copy_from_user(old_ucontext_param,
- (struct lttng_kernel_old_context __user *) arg,
- sizeof(struct lttng_kernel_old_context))) {
+ (struct lttng_kernel_abi_old_context __user *) arg,
+ sizeof(struct lttng_kernel_abi_old_context))) {
ret = -EFAULT;
goto old_ctx_error_free_old_param;
}
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) {
+ if (old_ucontext_param->ctx == LTTNG_KERNEL_ABI_CONTEXT_PERF_COUNTER) {
ucontext_param->u.perf_counter.type =
old_ucontext_param->u.perf_counter.type;
ucontext_param->u.perf_counter.config =
ret = lttng_abi_add_context(file,
ucontext_param,
- &channel->ctx, channel->session);
+ &channel->priv->ctx, channel->parent.session);
old_ctx_error_free_old_param:
kfree(old_ucontext_param);
old_ctx_end:
return ret;
}
- case LTTNG_KERNEL_CONTEXT:
+ case LTTNG_KERNEL_ABI_CONTEXT:
{
- struct lttng_kernel_context ucontext_param;
+ struct lttng_kernel_abi_context ucontext_param;
if (copy_from_user(&ucontext_param,
- (struct lttng_kernel_context __user *) arg,
+ (struct lttng_kernel_abi_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);
+ &channel->priv->ctx, channel->parent.session);
+ }
+ case LTTNG_KERNEL_ABI_OLD_ENABLE:
+ case LTTNG_KERNEL_ABI_ENABLE:
+ return lttng_channel_enable(&channel->parent);
+ case LTTNG_KERNEL_ABI_OLD_DISABLE:
+ case LTTNG_KERNEL_ABI_DISABLE:
+ return lttng_channel_disable(&channel->parent);
+ case LTTNG_KERNEL_ABI_SYSCALL_MASK:
+ return lttng_syscall_table_get_active_mask(&channel->priv->parent.syscall_table,
+ (struct lttng_kernel_abi_syscall_mask __user *) arg);
default:
return -ENOIOCTLCMD;
}
* @arg: command arg
*
* This ioctl implements lttng commands:
- * LTTNG_KERNEL_STREAM
+ * LTTNG_KERNEL_ABI_STREAM
* Returns an event stream file descriptor or failure.
*
* Channel and event file descriptors also hold a reference on the session.
long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
switch (cmd) {
- case LTTNG_KERNEL_OLD_STREAM:
- case LTTNG_KERNEL_STREAM:
+ case LTTNG_KERNEL_ABI_OLD_STREAM:
+ case LTTNG_KERNEL_ABI_STREAM:
return lttng_abi_open_metadata_stream(file);
default:
return -ENOIOCTLCMD;
* @file: the file
* @wait: poll table
*/
+static
unsigned int lttng_channel_poll(struct file *file, poll_table *wait)
{
- struct lttng_channel *channel = file->private_data;
+ struct lttng_kernel_channel_buffer *channel = file->private_data;
unsigned int mask = 0;
if (file->f_mode & FMODE_READ) {
poll_wait_set_exclusive(wait);
- poll_wait(file, channel->ops->get_hp_wait_queue(channel->chan),
+ poll_wait(file, channel->ops->priv->get_hp_wait_queue(channel->priv->rb_chan),
wait);
- if (channel->ops->is_disabled(channel->chan))
+ if (channel->ops->priv->is_disabled(channel->priv->rb_chan))
return POLLERR;
- if (channel->ops->is_finalized(channel->chan))
+ if (channel->ops->priv->is_finalized(channel->priv->rb_chan))
return POLLHUP;
- if (channel->ops->buffer_has_read_closed_stream(channel->chan))
+ if (channel->ops->priv->buffer_has_read_closed_stream(channel->priv->rb_chan))
return POLLIN | POLLRDNORM;
return 0;
}
static
int lttng_channel_release(struct inode *inode, struct file *file)
{
- struct lttng_channel *channel = file->private_data;
+ struct lttng_kernel_channel_buffer *channel = file->private_data;
if (channel)
- fput(channel->session->file);
+ fput(channel->parent.session->priv->file);
return 0;
}
static
int lttng_metadata_channel_release(struct inode *inode, struct file *file)
{
- struct lttng_channel *channel = file->private_data;
+ struct lttng_kernel_channel_buffer *channel = file->private_data;
if (channel) {
- fput(channel->session->file);
- lttng_metadata_channel_destroy(channel);
+ fput(channel->parent.session->priv->file);
+ lttng_metadata_channel_buffer_destroy(channel);
}
return 0;
* @arg: command arg
*
* This ioctl implements lttng commands:
- * LTTNG_KERNEL_CONTEXT
+ * LTTNG_KERNEL_ABI_CONTEXT
* Prepend a context field to each record of this event
- * LTTNG_KERNEL_ENABLE
+ * LTTNG_KERNEL_ABI_ENABLE
* Enable recording for this event (weak enable)
- * LTTNG_KERNEL_DISABLE
+ * LTTNG_KERNEL_ABI_DISABLE
* Disable recording for this event (strong disable)
*/
static
long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
- struct lttng_event *event;
- struct lttng_enabler *enabler;
- enum lttng_event_type *evtype = file->private_data;
+ struct lttng_kernel_event_common *event = file->private_data;
switch (cmd) {
- case LTTNG_KERNEL_OLD_CONTEXT:
+ case LTTNG_KERNEL_ABI_OLD_CONTEXT:
{
/* Not implemented */
return -ENOSYS;
}
- case LTTNG_KERNEL_CONTEXT:
+ case LTTNG_KERNEL_ABI_CONTEXT:
{
/* Not implemented */
return -ENOSYS;
}
- case LTTNG_KERNEL_OLD_ENABLE:
- case LTTNG_KERNEL_ENABLE:
- 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:
- 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);
- }
+ case LTTNG_KERNEL_ABI_OLD_ENABLE:
+ case LTTNG_KERNEL_ABI_ENABLE:
+ return lttng_event_enable(event);
+ case LTTNG_KERNEL_ABI_OLD_DISABLE:
+ case LTTNG_KERNEL_ABI_DISABLE:
+ return lttng_event_disable(event);
+ case LTTNG_KERNEL_ABI_FILTER:
+ return -EINVAL;
+ case LTTNG_KERNEL_ABI_ADD_CALLSITE:
+ return lttng_event_add_callsite(event,
+ (struct lttng_kernel_abi_event_callsite __user *) arg);
+ default:
+ return -ENOIOCTLCMD;
+ }
+}
+
+/**
+ * lttng_event_recorder_enabler_ioctl - lttng syscall through ioctl
+ *
+ * @file: the file
+ * @cmd: the command
+ * @arg: command arg
+ *
+ * This ioctl implements lttng commands:
+ * LTTNG_KERNEL_ABI_CONTEXT
+ * Prepend a context field to each record of this event
+ * LTTNG_KERNEL_ABI_ENABLE
+ * Enable recording for this event (weak enable)
+ * LTTNG_KERNEL_ABI_DISABLE
+ * Disable recording for this event (strong disable)
+ */
+static
+long lttng_event_enabler_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ struct lttng_event_enabler_common *event_enabler = file->private_data;
+
+ switch (cmd) {
+ case LTTNG_KERNEL_ABI_OLD_CONTEXT:
+ {
+ /* Not implemented */
+ return -ENOSYS;
+ }
+ case LTTNG_KERNEL_ABI_CONTEXT:
+ {
+ /* Not implemented */
+ return -ENOSYS;
+ }
+ case LTTNG_KERNEL_ABI_OLD_ENABLE:
+ case LTTNG_KERNEL_ABI_ENABLE:
+ return lttng_event_enabler_enable(event_enabler);
+ case LTTNG_KERNEL_ABI_OLD_DISABLE:
+ case LTTNG_KERNEL_ABI_DISABLE:
+ return lttng_event_enabler_disable(event_enabler);
+ case LTTNG_KERNEL_ABI_FILTER:
+ /*
+ * Filters are only supported by tracepoint and syscall instrumentation.
+ */
+ switch (event_enabler->event_param.instrumentation) {
+ case LTTNG_KERNEL_ABI_TRACEPOINT:
+ lttng_fallthrough;
+ case LTTNG_KERNEL_ABI_SYSCALL:
+ return lttng_event_enabler_attach_filter_bytecode(event_enabler,
+ (struct lttng_kernel_abi_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:
- WARN_ON_ONCE(1);
- return -ENOSYS;
}
+ case LTTNG_KERNEL_ABI_ADD_CALLSITE:
+ return -EINVAL;
default:
return -ENOIOCTLCMD;
}
}
static
-int lttng_event_release(struct inode *inode, struct file *file)
+int lttng_event_session_release(struct inode *inode, struct file *file)
{
- struct lttng_event *event;
- struct lttng_enabler *enabler;
- enum lttng_event_type *evtype = file->private_data;
-
- if (!evtype)
- return 0;
+ struct lttng_kernel_event_common *event = file->private_data;
- 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) {
+ struct lttng_kernel_event_session_common_private *event_session_priv =
+ container_of(event->priv, struct lttng_kernel_event_session_common_private, parent);
+ fput(event_session_priv->chan->priv->file);
}
+ return 0;
+}
+static
+int lttng_event_session_enabler_release(struct inode *inode, struct file *file)
+{
+ struct lttng_event_enabler_common *event_enabler = file->private_data;
+
+ if (event_enabler) {
+ struct lttng_event_enabler_session_common *event_session_enabler =
+ container_of(event_enabler, struct lttng_event_enabler_session_common, parent);
+ fput(event_session_enabler->chan->priv->file);
+ }
return 0;
}
-/* TODO: filter control ioctl */
-static const struct file_operations lttng_event_fops = {
+static const struct file_operations lttng_event_session_fops = {
.owner = THIS_MODULE,
- .release = lttng_event_release,
+ .release = lttng_event_session_release,
.unlocked_ioctl = lttng_event_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = lttng_event_ioctl,
#endif
};
+static const struct file_operations lttng_event_session_enabler_fops = {
+ .owner = THIS_MODULE,
+ .release = lttng_event_session_enabler_release,
+ .unlocked_ioctl = lttng_event_enabler_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = lttng_event_enabler_ioctl,
+#endif
+};
+
static int put_u64(uint64_t val, unsigned long arg)
{
return put_user(val, (uint64_t __user *) arg);
}
+static int put_u32(uint32_t val, unsigned long arg)
+{
+ return put_user(val, (uint32_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;
+ struct lttng_kernel_ring_buffer *buf = filp->private_data;
+ struct lttng_kernel_ring_buffer_channel *chan = buf->backend.chan;
+ const struct lttng_kernel_ring_buffer_config *config = &chan->backend.config;
+ const struct lttng_kernel_channel_buffer_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:
+ case LTTNG_KERNEL_ABI_RING_BUFFER_GET_TIMESTAMP_BEGIN:
{
uint64_t ts;
- ret = ops->timestamp_begin(config, buf, &ts);
+ ret = ops->priv->timestamp_begin(config, buf, &ts);
if (ret < 0)
goto error;
return put_u64(ts, arg);
}
- case LTTNG_RING_BUFFER_GET_TIMESTAMP_END:
+ case LTTNG_KERNEL_ABI_RING_BUFFER_GET_TIMESTAMP_END:
{
uint64_t ts;
- ret = ops->timestamp_end(config, buf, &ts);
+ ret = ops->priv->timestamp_end(config, buf, &ts);
if (ret < 0)
goto error;
return put_u64(ts, arg);
}
- case LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED:
+ case LTTNG_KERNEL_ABI_RING_BUFFER_GET_EVENTS_DISCARDED:
{
uint64_t ed;
- ret = ops->events_discarded(config, buf, &ed);
+ ret = ops->priv->events_discarded(config, buf, &ed);
if (ret < 0)
goto error;
return put_u64(ed, arg);
}
- case LTTNG_RING_BUFFER_GET_CONTENT_SIZE:
+ case LTTNG_KERNEL_ABI_RING_BUFFER_GET_CONTENT_SIZE:
{
uint64_t cs;
- ret = ops->content_size(config, buf, &cs);
+ ret = ops->priv->content_size(config, buf, &cs);
if (ret < 0)
goto error;
return put_u64(cs, arg);
}
- case LTTNG_RING_BUFFER_GET_PACKET_SIZE:
+ case LTTNG_KERNEL_ABI_RING_BUFFER_GET_PACKET_SIZE:
{
uint64_t ps;
- ret = ops->packet_size(config, buf, &ps);
+ ret = ops->priv->packet_size(config, buf, &ps);
if (ret < 0)
goto error;
return put_u64(ps, arg);
}
- case LTTNG_RING_BUFFER_GET_STREAM_ID:
+ case LTTNG_KERNEL_ABI_RING_BUFFER_GET_STREAM_ID:
{
uint64_t si;
- ret = ops->stream_id(config, buf, &si);
+ ret = ops->priv->stream_id(config, buf, &si);
if (ret < 0)
goto error;
return put_u64(si, arg);
}
- case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP:
+ case LTTNG_KERNEL_ABI_RING_BUFFER_GET_CURRENT_TIMESTAMP:
{
uint64_t ts;
- ret = ops->current_timestamp(config, buf, &ts);
+ ret = ops->priv->current_timestamp(config, buf, &ts);
if (ret < 0)
goto error;
return put_u64(ts, arg);
}
- case LTTNG_RING_BUFFER_GET_SEQ_NUM:
+ case LTTNG_KERNEL_ABI_RING_BUFFER_GET_SEQ_NUM:
{
uint64_t seq;
- ret = ops->sequence_number(config, buf, &seq);
+ ret = ops->priv->sequence_number(config, buf, &seq);
if (ret < 0)
goto error;
return put_u64(seq, arg);
}
- case LTTNG_RING_BUFFER_INSTANCE_ID:
+ case LTTNG_KERNEL_ABI_RING_BUFFER_INSTANCE_ID:
{
uint64_t id;
- ret = ops->instance_id(config, buf, &id);
+ ret = ops->priv->instance_id(config, buf, &id);
if (ret < 0)
goto error;
return put_u64(id, arg);
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;
+ struct lttng_kernel_ring_buffer *buf = filp->private_data;
+ struct lttng_kernel_ring_buffer_channel *chan = buf->backend.chan;
+ const struct lttng_kernel_ring_buffer_config *config = &chan->backend.config;
+ const struct lttng_kernel_channel_buffer_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:
+ case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN:
{
uint64_t ts;
- ret = ops->timestamp_begin(config, buf, &ts);
+ ret = ops->priv->timestamp_begin(config, buf, &ts);
if (ret < 0)
goto error;
return put_u64(ts, arg);
}
- case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_END:
+ case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_TIMESTAMP_END:
{
uint64_t ts;
- ret = ops->timestamp_end(config, buf, &ts);
+ ret = ops->priv->timestamp_end(config, buf, &ts);
if (ret < 0)
goto error;
return put_u64(ts, arg);
}
- case LTTNG_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED:
+ case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED:
{
uint64_t ed;
- ret = ops->events_discarded(config, buf, &ed);
+ ret = ops->priv->events_discarded(config, buf, &ed);
if (ret < 0)
goto error;
return put_u64(ed, arg);
}
- case LTTNG_RING_BUFFER_COMPAT_GET_CONTENT_SIZE:
+ case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_CONTENT_SIZE:
{
uint64_t cs;
- ret = ops->content_size(config, buf, &cs);
+ ret = ops->priv->content_size(config, buf, &cs);
if (ret < 0)
goto error;
return put_u64(cs, arg);
}
- case LTTNG_RING_BUFFER_COMPAT_GET_PACKET_SIZE:
+ case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_PACKET_SIZE:
{
uint64_t ps;
- ret = ops->packet_size(config, buf, &ps);
+ ret = ops->priv->packet_size(config, buf, &ps);
if (ret < 0)
goto error;
return put_u64(ps, arg);
}
- case LTTNG_RING_BUFFER_COMPAT_GET_STREAM_ID:
+ case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_STREAM_ID:
{
uint64_t si;
- ret = ops->stream_id(config, buf, &si);
+ ret = ops->priv->stream_id(config, buf, &si);
if (ret < 0)
goto error;
return put_u64(si, arg);
}
- case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP:
+ case LTTNG_KERNEL_ABI_RING_BUFFER_GET_CURRENT_TIMESTAMP:
{
uint64_t ts;
- ret = ops->current_timestamp(config, buf, &ts);
+ ret = ops->priv->current_timestamp(config, buf, &ts);
if (ret < 0)
goto error;
return put_u64(ts, arg);
}
- case LTTNG_RING_BUFFER_COMPAT_GET_SEQ_NUM:
+ case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_GET_SEQ_NUM:
{
uint64_t seq;
- ret = ops->sequence_number(config, buf, &seq);
+ ret = ops->priv->sequence_number(config, buf, &seq);
if (ret < 0)
goto error;
return put_u64(seq, arg);
}
- case LTTNG_RING_BUFFER_COMPAT_INSTANCE_ID:
+ case LTTNG_KERNEL_ABI_RING_BUFFER_COMPAT_INSTANCE_ID:
{
uint64_t id;
- ret = ops->instance_id(config, buf, &id);
+ ret = ops->priv->instance_id(config, buf, &id);
if (ret < 0)
goto error;
return put_u64(id, arg);
<tng_proc_ops, NULL);
if (!lttng_proc_dentry) {
- printk(KERN_ERR "Error creating LTTng control file\n");
+ printk(KERN_ERR "LTTng: Error creating control file\n");
ret = -ENOMEM;
goto error;
}
projects / lttng-modules.git / blobdiff