X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=ltt-debugfs-abi.c;h=37b78de08d173ffbf88d16a9c5fccbba186ec4a3;hb=53f1f0ca4eb1890673992697c19e4e1507ec4ac5;hp=99b4196616419e754544e46469da5edba4f9610a;hpb=881833e349e275ac324fc3abf8a34d76f91047ea;p=lttng-modules.git diff --git a/ltt-debugfs-abi.c b/ltt-debugfs-abi.c index 99b41966..37b78de0 100644 --- a/ltt-debugfs-abi.c +++ b/ltt-debugfs-abi.c @@ -32,6 +32,7 @@ #include "wrapper/ringbuffer/vfs.h" #include "ltt-debugfs-abi.h" #include "ltt-events.h" +#include "ltt-tracer.h" /* * This is LTTng's own personal way to create a system call as an external @@ -83,6 +84,87 @@ fd_error: return ret; } +static +int lttng_abi_tracepoint_list(void) +{ + struct file *tracepoint_list_file; + int file_fd, ret; + + file_fd = get_unused_fd(); + if (file_fd < 0) { + ret = file_fd; + goto fd_error; + } + + tracepoint_list_file = anon_inode_getfile("[lttng_session]", + <tng_tracepoint_list_fops, + NULL, O_RDWR); + if (IS_ERR(tracepoint_list_file)) { + ret = PTR_ERR(tracepoint_list_file); + goto file_error; + } + ret = lttng_tracepoint_list_fops.open(NULL, tracepoint_list_file); + if (ret < 0) + goto open_error; + fd_install(file_fd, tracepoint_list_file); + if (file_fd < 0) { + ret = file_fd; + goto fd_error; + } + return file_fd; + +open_error: + fput(tracepoint_list_file); +file_error: + put_unused_fd(file_fd); +fd_error: + return ret; +} + +static +long lttng_abi_tracer_version(struct file *file, + struct lttng_kernel_tracer_version __user *uversion_param) +{ + struct lttng_kernel_tracer_version v; + + v.version = LTTNG_VERSION; + v.patchlevel = LTTNG_PATCHLEVEL; + v.sublevel = LTTNG_SUBLEVEL; + + if (copy_to_user(uversion_param, &v, sizeof(v))) + return -EFAULT; + return 0; +} + +static +long lttng_abi_add_context(struct file *file, + struct lttng_kernel_context __user *ucontext_param, + struct lttng_ctx **ctx, struct ltt_session *session) +{ + struct lttng_kernel_context context_param; + + if (session->been_active) + return -EPERM; + + if (copy_from_user(&context_param, ucontext_param, sizeof(context_param))) + return -EFAULT; + + switch (context_param.ctx) { + case LTTNG_KERNEL_CONTEXT_PID: + return lttng_add_pid_to_ctx(ctx); + case LTTNG_KERNEL_CONTEXT_PRIO: + return lttng_add_prio_to_ctx(ctx); + case LTTNG_KERNEL_CONTEXT_NICE: + return lttng_add_nice_to_ctx(ctx); + case LTTNG_KERNEL_CONTEXT_PERF_COUNTER: + return -ENOSYS; + case LTTNG_KERNEL_CONTEXT_COMM: + return lttng_add_comm_to_ctx(ctx); + default: + return -EINVAL; + } +} + /** * lttng_ioctl - lttng syscall through ioctl * @@ -91,8 +173,12 @@ fd_error: * @arg: command arg * * This ioctl implements lttng commands: - * LTTNG_SESSION + * LTTNG_KERNEL_SESSION * Returns a LTTng trace session file descriptor + * LTTNG_KERNEL_TRACER_VERSION + * Returns the LTTng kernel tracer version + * LTTNG_KERNEL_TRACEPOINT_LIST + * Returns a file descriptor listing available tracepoints * * The returned session will be deleted when its file descriptor is closed. */ @@ -100,8 +186,13 @@ static long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { switch (cmd) { - case LTTNG_SESSION: + case LTTNG_KERNEL_SESSION: return lttng_abi_create_session(); + case LTTNG_KERNEL_TRACER_VERSION: + return lttng_abi_tracer_version(file, + (struct lttng_kernel_tracer_version __user *) arg); + case LTTNG_KERNEL_TRACEPOINT_LIST: + return lttng_abi_tracepoint_list(); default: return -ENOIOCTLCMD; } @@ -123,38 +214,32 @@ static void lttng_metadata_create_events(struct file *channel_file) { struct ltt_channel *channel = channel_file->private_data; - char *event_name = "lttng-metadata"; + static struct lttng_kernel_event metadata_params = { + .instrumentation = LTTNG_KERNEL_TRACEPOINT, + .name = "lttng_metadata", + }; struct ltt_event *event; int ret; - void *probe; - probe = ltt_probe_get(event_name); - if (!probe) { - ret = -ENOENT; - goto probe_error; - } /* * We tolerate no failure path after event creation. It will stay * invariant for the rest of the session. */ - event = ltt_event_create(channel, event_name, INSTRUM_TRACEPOINTS, - probe, NULL); + event = ltt_event_create(channel, &metadata_params, NULL); if (!event) { - goto event_error; - ret = -EEXIST; + ret = -EINVAL; + goto create_error; } return; -event_error: - ltt_probe_put(probe); -probe_error: +create_error: WARN_ON(1); return; /* not allowed to return error */ } static int lttng_abi_create_channel(struct file *session_file, - struct lttng_channel __user *uchan_param, + struct lttng_kernel_channel __user *uchan_param, enum channel_type channel_type) { struct ltt_session *session = session_file->private_data; @@ -162,7 +247,7 @@ int lttng_abi_create_channel(struct file *session_file, const char *transport_name; struct ltt_channel *chan; struct file *chan_file; - struct lttng_channel chan_param; + struct lttng_kernel_channel chan_param; int chan_fd; int ret = 0; @@ -210,8 +295,10 @@ int lttng_abi_create_channel(struct file *session_file, chan->file = chan_file; chan_file->private_data = chan; fd_install(chan_fd, chan_file); - if (channel_type == METADATA_CHANNEL) + if (channel_type == METADATA_CHANNEL) { + session->metadata = chan; lttng_metadata_create_events(chan_file); + } /* The channel created holds a reference on the session */ atomic_long_inc(&session_file->f_count); @@ -234,8 +321,14 @@ fd_error: * @arg: command arg * * This ioctl implements lttng commands: - * LTTNG_CHANNEL + * LTTNG_KERNEL_CHANNEL * Returns a LTTng channel file descriptor + * LTTNG_KERNEL_SESSION_START + * Starts tracing session + * LTTNG_KERNEL_SESSION_STOP + * Stops tracing session + * LTTNG_KERNEL_METADATA + * Returns a LTTng metadata file descriptor * * The returned channel will be deleted when its file descriptor is closed. */ @@ -245,17 +338,17 @@ long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg) struct ltt_session *session = file->private_data; switch (cmd) { - case LTTNG_CHANNEL: + case LTTNG_KERNEL_CHANNEL: return lttng_abi_create_channel(file, - (struct lttng_channel __user *)arg, + (struct lttng_kernel_channel __user *) arg, PER_CPU_CHANNEL); - case LTTNG_SESSION_START: + case LTTNG_KERNEL_SESSION_START: return ltt_session_start(session); - case LTTNG_SESSION_STOP: + case LTTNG_KERNEL_SESSION_STOP: return ltt_session_stop(session); - case LTTNG_METADATA: + case LTTNG_KERNEL_METADATA: return lttng_abi_create_channel(file, - (struct lttng_channel __user *)arg, + (struct lttng_kernel_channel __user *) arg, METADATA_CHANNEL); default: return -ENOIOCTLCMD; @@ -335,31 +428,26 @@ fd_error: static int lttng_abi_create_event(struct file *channel_file, - struct lttng_event __user *uevent_param) + struct lttng_kernel_event __user *uevent_param) { struct ltt_channel *channel = channel_file->private_data; struct ltt_event *event; - char *event_name; - struct lttng_event event_param; + struct lttng_kernel_event event_param; int event_fd, ret; struct file *event_file; - void *probe; if (copy_from_user(&event_param, uevent_param, sizeof(event_param))) return -EFAULT; - event_name = kmalloc(PATH_MAX, GFP_KERNEL); - if (!event_name) - return -ENOMEM; - if (strncpy_from_user(event_name, uevent_param->name, PATH_MAX) < 0) { - ret = -EFAULT; - goto name_error; - } - event_name[PATH_MAX - 1] = '\0'; - - probe = ltt_probe_get(event_name); - if (!probe) { - ret = -ENOENT; - goto probe_error; + event_param.name[LTTNG_SYM_NAME_LEN - 1] = '\0'; + switch (event_param.instrumentation) { + case LTTNG_KERNEL_KPROBE: + event_param.u.kprobe.symbol_name[LTTNG_SYM_NAME_LEN - 1] = '\0'; + break; + case LTTNG_KERNEL_FUNCTION: + event_param.u.ftrace.symbol_name[LTTNG_SYM_NAME_LEN - 1] = '\0'; + break; + default: + break; } event_fd = get_unused_fd(); if (event_fd < 0) { @@ -377,17 +465,15 @@ int lttng_abi_create_event(struct file *channel_file, * We tolerate no failure path after event creation. It will stay * invariant for the rest of the session. */ - event = ltt_event_create(channel, event_name, event_param.itype, - probe, NULL); + event = ltt_event_create(channel, &event_param, NULL); if (!event) { + ret = -EINVAL; goto event_error; - ret = -EEXIST; } event_file->private_data = event; fd_install(event_fd, event_file); /* The event holds a reference on the channel */ atomic_long_inc(&channel_file->f_count); - kfree(event_name); return event_fd; event_error: @@ -395,10 +481,6 @@ event_error: file_error: put_unused_fd(event_fd); fd_error: - ltt_probe_put(probe); -probe_error: -name_error: - kfree(event_name); return ret; } @@ -410,22 +492,30 @@ name_error: * @arg: command arg * * This ioctl implements lttng commands: - * LTTNG_STREAM + * LTTNG_KERNEL_STREAM * Returns an event stream file descriptor or failure. * (typically, one event stream records events from one CPU) - * LTTNG_EVENT + * LTTNG_KERNEL_EVENT * Returns an event file descriptor or failure. + * LTTNG_KERNEL_CONTEXT + * Prepend a context field to each event in the channel * * 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 ltt_channel *channel = file->private_data; + switch (cmd) { - case LTTNG_STREAM: + case LTTNG_KERNEL_STREAM: return lttng_abi_open_stream(file); - case LTTNG_EVENT: - return lttng_abi_create_event(file, (struct lttng_event __user *)arg); + case LTTNG_KERNEL_EVENT: + return lttng_abi_create_event(file, (struct lttng_kernel_event __user *) arg); + case LTTNG_KERNEL_CONTEXT: + return lttng_abi_add_context(file, + (struct lttng_kernel_context __user *) arg, + &channel->ctx, channel->session); default: return -ENOIOCTLCMD; } @@ -439,7 +529,7 @@ long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg) * @arg: command arg * * This ioctl implements lttng commands: - * LTTNG_STREAM + * LTTNG_KERNEL_STREAM * Returns an event stream file descriptor or failure. * * Channel and event file descriptors also hold a reference on the session. @@ -448,7 +538,7 @@ static long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { switch (cmd) { - case LTTNG_STREAM: + case LTTNG_KERNEL_STREAM: return lttng_abi_open_stream(file); default: return -ENOIOCTLCMD; @@ -513,6 +603,37 @@ static const struct file_operations lttng_metadata_fops = { #endif }; +/** + * lttng_event_ioctl - lttng syscall through ioctl + * + * @file: the file + * @cmd: the command + * @arg: command arg + * + * This ioctl implements lttng commands: + * LTTNG_KERNEL_STREAM + * Returns an event stream file descriptor or failure. + * (typically, one event stream records events from one CPU) + * LTTNG_KERNEL_EVENT + * Returns an event file descriptor or failure. + * LTTNG_KERNEL_CONTEXT + * Prepend a context field to each record of this event + */ +static +long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +{ + struct ltt_event *event = file->private_data; + + switch (cmd) { + case LTTNG_KERNEL_CONTEXT: + return lttng_abi_add_context(file, + (struct lttng_kernel_context __user *) arg, + &event->ctx, event->chan->session); + default: + return -ENOIOCTLCMD; + } +} + static int lttng_event_release(struct inode *inode, struct file *file) { @@ -526,6 +647,10 @@ int lttng_event_release(struct inode *inode, struct file *file) /* TODO: filter control ioctl */ static const struct file_operations lttng_event_fops = { .release = lttng_event_release, + .unlocked_ioctl = lttng_event_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = lttng_event_ioctl, +#endif }; int __init ltt_debugfs_abi_init(void)