diff options
Diffstat (limited to 'kernel/trace/trace_events.c')
| -rw-r--r-- | kernel/trace/trace_events.c | 2943 |
1 files changed, 2943 insertions, 0 deletions
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c new file mode 100644 index 000000000..c4de47fc5 --- /dev/null +++ b/kernel/trace/trace_events.c @@ -0,0 +1,2943 @@ +/* + * event tracer + * + * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com> + * + * - Added format output of fields of the trace point. + * This was based off of work by Tom Zanussi <tzanussi@gmail.com>. + * + */ + +#define pr_fmt(fmt) fmt + +#include <linux/workqueue.h> +#include <linux/spinlock.h> +#include <linux/kthread.h> +#include <linux/tracefs.h> +#include <linux/uaccess.h> +#include <linux/module.h> +#include <linux/ctype.h> +#include <linux/slab.h> +#include <linux/delay.h> + +#include <asm/setup.h> + +#include "trace_output.h" + +#undef TRACE_SYSTEM +#define TRACE_SYSTEM "TRACE_SYSTEM" + +DEFINE_MUTEX(event_mutex); + +LIST_HEAD(ftrace_events); +static LIST_HEAD(ftrace_common_fields); + +#define GFP_TRACE (GFP_KERNEL | __GFP_ZERO) + +static struct kmem_cache *field_cachep; +static struct kmem_cache *file_cachep; + +#define SYSTEM_FL_FREE_NAME (1 << 31) + +static inline int system_refcount(struct event_subsystem *system) +{ + return system->ref_count & ~SYSTEM_FL_FREE_NAME; +} + +static int system_refcount_inc(struct event_subsystem *system) +{ + return (system->ref_count++) & ~SYSTEM_FL_FREE_NAME; +} + +static int system_refcount_dec(struct event_subsystem *system) +{ + return (--system->ref_count) & ~SYSTEM_FL_FREE_NAME; +} + +/* Double loops, do not use break, only goto's work */ +#define do_for_each_event_file(tr, file) \ + list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ + list_for_each_entry(file, &tr->events, list) + +#define do_for_each_event_file_safe(tr, file) \ + list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ + struct ftrace_event_file *___n; \ + list_for_each_entry_safe(file, ___n, &tr->events, list) + +#define while_for_each_event_file() \ + } + +static struct list_head * +trace_get_fields(struct ftrace_event_call *event_call) +{ + if (!event_call->class->get_fields) + return &event_call->class->fields; + return event_call->class->get_fields(event_call); +} + +static struct ftrace_event_field * +__find_event_field(struct list_head *head, char *name) +{ + struct ftrace_event_field *field; + + list_for_each_entry(field, head, link) { + if (!strcmp(field->name, name)) + return field; + } + + return NULL; +} + +struct ftrace_event_field * +trace_find_event_field(struct ftrace_event_call *call, char *name) +{ + struct ftrace_event_field *field; + struct list_head *head; + + field = __find_event_field(&ftrace_common_fields, name); + if (field) + return field; + + head = trace_get_fields(call); + return __find_event_field(head, name); +} + +static int __trace_define_field(struct list_head *head, const char *type, + const char *name, int offset, int size, + int is_signed, int filter_type) +{ + struct ftrace_event_field *field; + + field = kmem_cache_alloc(field_cachep, GFP_TRACE); + if (!field) + return -ENOMEM; + + field->name = name; + field->type = type; + + if (filter_type == FILTER_OTHER) + field->filter_type = filter_assign_type(type); + else + field->filter_type = filter_type; + + field->offset = offset; + field->size = size; + field->is_signed = is_signed; + + list_add(&field->link, head); + + return 0; +} + +int trace_define_field(struct ftrace_event_call *call, const char *type, + const char *name, int offset, int size, int is_signed, + int filter_type) +{ + struct list_head *head; + + if (WARN_ON(!call->class)) + return 0; + + head = trace_get_fields(call); + return __trace_define_field(head, type, name, offset, size, + is_signed, filter_type); +} +EXPORT_SYMBOL_GPL(trace_define_field); + +#define __common_field(type, item) \ + ret = __trace_define_field(&ftrace_common_fields, #type, \ + "common_" #item, \ + offsetof(typeof(ent), item), \ + sizeof(ent.item), \ + is_signed_type(type), FILTER_OTHER); \ + if (ret) \ + return ret; + +static int trace_define_common_fields(void) +{ + int ret; + struct trace_entry ent; + + __common_field(unsigned short, type); + __common_field(unsigned char, flags); + __common_field(unsigned char, preempt_count); + __common_field(int, pid); + + return ret; +} + +static void trace_destroy_fields(struct ftrace_event_call *call) +{ + struct ftrace_event_field *field, *next; + struct list_head *head; + + head = trace_get_fields(call); + list_for_each_entry_safe(field, next, head, link) { + list_del(&field->link); + kmem_cache_free(field_cachep, field); + } +} + +int trace_event_raw_init(struct ftrace_event_call *call) +{ + int id; + + id = register_ftrace_event(&call->event); + if (!id) + return -ENODEV; + + return 0; +} +EXPORT_SYMBOL_GPL(trace_event_raw_init); + +void *ftrace_event_buffer_reserve(struct ftrace_event_buffer *fbuffer, + struct ftrace_event_file *ftrace_file, + unsigned long len) +{ + struct ftrace_event_call *event_call = ftrace_file->event_call; + + local_save_flags(fbuffer->flags); + fbuffer->pc = preempt_count(); + fbuffer->ftrace_file = ftrace_file; + + fbuffer->event = + trace_event_buffer_lock_reserve(&fbuffer->buffer, ftrace_file, + event_call->event.type, len, + fbuffer->flags, fbuffer->pc); + if (!fbuffer->event) + return NULL; + + fbuffer->entry = ring_buffer_event_data(fbuffer->event); + return fbuffer->entry; +} +EXPORT_SYMBOL_GPL(ftrace_event_buffer_reserve); + +static DEFINE_SPINLOCK(tracepoint_iter_lock); + +static void output_printk(struct ftrace_event_buffer *fbuffer) +{ + struct ftrace_event_call *event_call; + struct trace_event *event; + unsigned long flags; + struct trace_iterator *iter = tracepoint_print_iter; + + if (!iter) + return; + + event_call = fbuffer->ftrace_file->event_call; + if (!event_call || !event_call->event.funcs || + !event_call->event.funcs->trace) + return; + + event = &fbuffer->ftrace_file->event_call->event; + + spin_lock_irqsave(&tracepoint_iter_lock, flags); + trace_seq_init(&iter->seq); + iter->ent = fbuffer->entry; + event_call->event.funcs->trace(iter, 0, event); + trace_seq_putc(&iter->seq, 0); + printk("%s", iter->seq.buffer); + + spin_unlock_irqrestore(&tracepoint_iter_lock, flags); +} + +void ftrace_event_buffer_commit(struct ftrace_event_buffer *fbuffer) +{ + if (tracepoint_printk) + output_printk(fbuffer); + + event_trigger_unlock_commit(fbuffer->ftrace_file, fbuffer->buffer, + fbuffer->event, fbuffer->entry, + fbuffer->flags, fbuffer->pc); +} +EXPORT_SYMBOL_GPL(ftrace_event_buffer_commit); + +int ftrace_event_reg(struct ftrace_event_call *call, + enum trace_reg type, void *data) +{ + struct ftrace_event_file *file = data; + + WARN_ON(!(call->flags & TRACE_EVENT_FL_TRACEPOINT)); + switch (type) { + case TRACE_REG_REGISTER: + return tracepoint_probe_register(call->tp, + call->class->probe, + file); + case TRACE_REG_UNREGISTER: + tracepoint_probe_unregister(call->tp, + call->class->probe, + file); + return 0; + +#ifdef CONFIG_PERF_EVENTS + case TRACE_REG_PERF_REGISTER: + return tracepoint_probe_register(call->tp, + call->class->perf_probe, + call); + case TRACE_REG_PERF_UNREGISTER: + tracepoint_probe_unregister(call->tp, + call->class->perf_probe, + call); + return 0; + case TRACE_REG_PERF_OPEN: + case TRACE_REG_PERF_CLOSE: + case TRACE_REG_PERF_ADD: + case TRACE_REG_PERF_DEL: + return 0; +#endif + } + return 0; +} +EXPORT_SYMBOL_GPL(ftrace_event_reg); + +void trace_event_enable_cmd_record(bool enable) +{ + struct ftrace_event_file *file; + struct trace_array *tr; + + mutex_lock(&event_mutex); + do_for_each_event_file(tr, file) { + + if (!(file->flags & FTRACE_EVENT_FL_ENABLED)) + continue; + + if (enable) { + tracing_start_cmdline_record(); + set_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags); + } else { + tracing_stop_cmdline_record(); + clear_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags); + } + } while_for_each_event_file(); + mutex_unlock(&event_mutex); +} + +static int __ftrace_event_enable_disable(struct ftrace_event_file *file, + int enable, int soft_disable) +{ + struct ftrace_event_call *call = file->event_call; + int ret = 0; + int disable; + + switch (enable) { + case 0: + /* + * When soft_disable is set and enable is cleared, the sm_ref + * reference counter is decremented. If it reaches 0, we want + * to clear the SOFT_DISABLED flag but leave the event in the + * state that it was. That is, if the event was enabled and + * SOFT_DISABLED isn't set, then do nothing. But if SOFT_DISABLED + * is set we do not want the event to be enabled before we + * clear the bit. + * + * When soft_disable is not set but the SOFT_MODE flag is, + * we do nothing. Do not disable the tracepoint, otherwise + * "soft enable"s (clearing the SOFT_DISABLED bit) wont work. + */ + if (soft_disable) { + if (atomic_dec_return(&file->sm_ref) > 0) + break; + disable = file->flags & FTRACE_EVENT_FL_SOFT_DISABLED; + clear_bit(FTRACE_EVENT_FL_SOFT_MODE_BIT, &file->flags); + } else + disable = !(file->flags & FTRACE_EVENT_FL_SOFT_MODE); + + if (disable && (file->flags & FTRACE_EVENT_FL_ENABLED)) { + clear_bit(FTRACE_EVENT_FL_ENABLED_BIT, &file->flags); + if (file->flags & FTRACE_EVENT_FL_RECORDED_CMD) { + tracing_stop_cmdline_record(); + clear_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags); + } + call->class->reg(call, TRACE_REG_UNREGISTER, file); + } + /* If in SOFT_MODE, just set the SOFT_DISABLE_BIT, else clear it */ + if (file->flags & FTRACE_EVENT_FL_SOFT_MODE) + set_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags); + else + clear_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags); + break; + case 1: + /* + * When soft_disable is set and enable is set, we want to + * register the tracepoint for the event, but leave the event + * as is. That means, if the event was already enabled, we do + * nothing (but set SOFT_MODE). If the event is disabled, we + * set SOFT_DISABLED before enabling the event tracepoint, so + * it still seems to be disabled. + */ + if (!soft_disable) + clear_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags); + else { + if (atomic_inc_return(&file->sm_ref) > 1) + break; + set_bit(FTRACE_EVENT_FL_SOFT_MODE_BIT, &file->flags); + } + + if (!(file->flags & FTRACE_EVENT_FL_ENABLED)) { + + /* Keep the event disabled, when going to SOFT_MODE. */ + if (soft_disable) + set_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags); + + if (trace_flags & TRACE_ITER_RECORD_CMD) { + tracing_start_cmdline_record(); + set_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags); + } + ret = call->class->reg(call, TRACE_REG_REGISTER, file); + if (ret) { + tracing_stop_cmdline_record(); + pr_info("event trace: Could not enable event " + "%s\n", ftrace_event_name(call)); + break; + } + set_bit(FTRACE_EVENT_FL_ENABLED_BIT, &file->flags); + + /* WAS_ENABLED gets set but never cleared. */ + call->flags |= TRACE_EVENT_FL_WAS_ENABLED; + } + break; + } + + return ret; +} + +int trace_event_enable_disable(struct ftrace_event_file *file, + int enable, int soft_disable) +{ + return __ftrace_event_enable_disable(file, enable, soft_disable); +} + +static int ftrace_event_enable_disable(struct ftrace_event_file *file, + int enable) +{ + return __ftrace_event_enable_disable(file, enable, 0); +} + +static void ftrace_clear_events(struct trace_array *tr) +{ + struct ftrace_event_file *file; + + mutex_lock(&event_mutex); + list_for_each_entry(file, &tr->events, list) { + ftrace_event_enable_disable(file, 0); + } + mutex_unlock(&event_mutex); +} + +static void __put_system(struct event_subsystem *system) +{ + struct event_filter *filter = system->filter; + + WARN_ON_ONCE(system_refcount(system) == 0); + if (system_refcount_dec(system)) + return; + + list_del(&system->list); + + if (filter) { + kfree(filter->filter_string); + kfree(filter); + } + if (system->ref_count & SYSTEM_FL_FREE_NAME) + kfree(system->name); + kfree(system); +} + +static void __get_system(struct event_subsystem *system) +{ + WARN_ON_ONCE(system_refcount(system) == 0); + system_refcount_inc(system); +} + +static void __get_system_dir(struct ftrace_subsystem_dir *dir) +{ + WARN_ON_ONCE(dir->ref_count == 0); + dir->ref_count++; + __get_system(dir->subsystem); +} + +static void __put_system_dir(struct ftrace_subsystem_dir *dir) +{ + WARN_ON_ONCE(dir->ref_count == 0); + /* If the subsystem is about to be freed, the dir must be too */ + WARN_ON_ONCE(system_refcount(dir->subsystem) == 1 && dir->ref_count != 1); + + __put_system(dir->subsystem); + if (!--dir->ref_count) + kfree(dir); +} + +static void put_system(struct ftrace_subsystem_dir *dir) +{ + mutex_lock(&event_mutex); + __put_system_dir(dir); + mutex_unlock(&event_mutex); +} + +static void remove_subsystem(struct ftrace_subsystem_dir *dir) +{ + if (!dir) + return; + + if (!--dir->nr_events) { + tracefs_remove_recursive(dir->entry); + list_del(&dir->list); + __put_system_dir(dir); + } +} + +static void remove_event_file_dir(struct ftrace_event_file *file) +{ + struct dentry *dir = file->dir; + struct dentry *child; + + if (dir) { + spin_lock(&dir->d_lock); /* probably unneeded */ + list_for_each_entry(child, &dir->d_subdirs, d_child) { + if (d_really_is_positive(child)) /* probably unneeded */ + d_inode(child)->i_private = NULL; + } + spin_unlock(&dir->d_lock); + + tracefs_remove_recursive(dir); + } + + list_del(&file->list); + remove_subsystem(file->system); + free_event_filter(file->filter); + kmem_cache_free(file_cachep, file); +} + +/* + * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. + */ +static int +__ftrace_set_clr_event_nolock(struct trace_array *tr, const char *match, + const char *sub, const char *event, int set) +{ + struct ftrace_event_file *file; + struct ftrace_event_call *call; + const char *name; + int ret = -EINVAL; + + list_for_each_entry(file, &tr->events, list) { + + call = file->event_call; + name = ftrace_event_name(call); + + if (!name || !call->class || !call->class->reg) + continue; + + if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) + continue; + + if (match && + strcmp(match, name) != 0 && + strcmp(match, call->class->system) != 0) + continue; + + if (sub && strcmp(sub, call->class->system) != 0) + continue; + + if (event && strcmp(event, name) != 0) + continue; + + ftrace_event_enable_disable(file, set); + + ret = 0; + } + + return ret; +} + +static int __ftrace_set_clr_event(struct trace_array *tr, const char *match, + const char *sub, const char *event, int set) +{ + int ret; + + mutex_lock(&event_mutex); + ret = __ftrace_set_clr_event_nolock(tr, match, sub, event, set); + mutex_unlock(&event_mutex); + + return ret; +} + +static int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set) +{ + char *event = NULL, *sub = NULL, *match; + int ret; + + /* + * The buf format can be <subsystem>:<event-name> + * *:<event-name> means any event by that name. + * :<event-name> is the same. + * + * <subsystem>:* means all events in that subsystem + * <subsystem>: means the same. + * + * <name> (no ':') means all events in a subsystem with + * the name <name> or any event that matches <name> + */ + + match = strsep(&buf, ":"); + if (buf) { + sub = match; + event = buf; + match = NULL; + + if (!strlen(sub) || strcmp(sub, "*") == 0) + sub = NULL; + if (!strlen(event) || strcmp(event, "*") == 0) + event = NULL; + } + + ret = __ftrace_set_clr_event(tr, match, sub, event, set); + + /* Put back the colon to allow this to be called again */ + if (buf) + *(buf - 1) = ':'; + + return ret; +} + +/** + * trace_set_clr_event - enable or disable an event + * @system: system name to match (NULL for any system) + * @event: event name to match (NULL for all events, within system) + * @set: 1 to enable, 0 to disable + * + * This is a way for other parts of the kernel to enable or disable + * event recording. + * + * Returns 0 on success, -EINVAL if the parameters do not match any + * registered events. + */ +int trace_set_clr_event(const char *system, const char *event, int set) +{ + struct trace_array *tr = top_trace_array(); + + if (!tr) + return -ENODEV; + + return __ftrace_set_clr_event(tr, NULL, system, event, set); +} +EXPORT_SYMBOL_GPL(trace_set_clr_event); + +/* 128 should be much more than enough */ +#define EVENT_BUF_SIZE 127 + +static ssize_t +ftrace_event_write(struct file *file, const char __user *ubuf, + size_t cnt, loff_t *ppos) +{ + struct trace_parser parser; + struct seq_file *m = file->private_data; + struct trace_array *tr = m->private; + ssize_t read, ret; + + if (!cnt) + return 0; + + ret = tracing_update_buffers(); + if (ret < 0) + return ret; + + if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) + return -ENOMEM; + + read = trace_get_user(&parser, ubuf, cnt, ppos); + + if (read >= 0 && trace_parser_loaded((&parser))) { + int set = 1; + + if (*parser.buffer == '!') + set = 0; + + parser.buffer[parser.idx] = 0; + + ret = ftrace_set_clr_event(tr, parser.buffer + !set, set); + if (ret) + goto out_put; + } + + ret = read; + + out_put: + trace_parser_put(&parser); + + return ret; +} + +static void * +t_next(struct seq_file *m, void *v, loff_t *pos) +{ + struct ftrace_event_file *file = v; + struct ftrace_event_call *call; + struct trace_array *tr = m->private; + + (*pos)++; + + list_for_each_entry_continue(file, &tr->events, list) { + call = file->event_call; + /* + * The ftrace subsystem is for showing formats only. + * They can not be enabled or disabled via the event files. + */ + if (call->class && call->class->reg) + return file; + } + + return NULL; +} + +static void *t_start(struct seq_file *m, loff_t *pos) +{ + struct ftrace_event_file *file; + struct trace_array *tr = m->private; + loff_t l; + + mutex_lock(&event_mutex); + + file = list_entry(&tr->events, struct ftrace_event_file, list); + for (l = 0; l <= *pos; ) { + file = t_next(m, file, &l); + if (!file) + break; + } + return file; +} + +static void * +s_next(struct seq_file *m, void *v, loff_t *pos) +{ + struct ftrace_event_file *file = v; + struct trace_array *tr = m->private; + + (*pos)++; + + list_for_each_entry_continue(file, &tr->events, list) { + if (file->flags & FTRACE_EVENT_FL_ENABLED) + return file; + } + + return NULL; +} + +static void *s_start(struct seq_file *m, loff_t *pos) +{ + struct ftrace_event_file *file; + struct trace_array *tr = m->private; + loff_t l; + + mutex_lock(&event_mutex); + + file = list_entry(&tr->events, struct ftrace_event_file, list); + for (l = 0; l <= *pos; ) { + file = s_next(m, file, &l); + if (!file) + break; + } + return file; +} + +static int t_show(struct seq_file *m, void *v) +{ + struct ftrace_event_file *file = v; + struct ftrace_event_call *call = file->event_call; + + if (strcmp(call->class->system, TRACE_SYSTEM) != 0) + seq_printf(m, "%s:", call->class->system); + seq_printf(m, "%s\n", ftrace_event_name(call)); + + return 0; +} + +static void t_stop(struct seq_file *m, void *p) +{ + mutex_unlock(&event_mutex); +} + +static ssize_t +event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, + loff_t *ppos) +{ + struct ftrace_event_file *file; + unsigned long flags; + char buf[4] = "0"; + + mutex_lock(&event_mutex); + file = event_file_data(filp); + if (likely(file)) + flags = file->flags; + mutex_unlock(&event_mutex); + + if (!file) + return -ENODEV; + + if (flags & FTRACE_EVENT_FL_ENABLED && + !(flags & FTRACE_EVENT_FL_SOFT_DISABLED)) + strcpy(buf, "1"); + + if (flags & FTRACE_EVENT_FL_SOFT_DISABLED || + flags & FTRACE_EVENT_FL_SOFT_MODE) + strcat(buf, "*"); + + strcat(buf, "\n"); + + return simple_read_from_buffer(ubuf, cnt, ppos, buf, strlen(buf)); +} + +static ssize_t +event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, + loff_t *ppos) +{ + struct ftrace_event_file *file; + unsigned long val; + int ret; + + ret = kstrtoul_from_user(ubuf, cnt, 10, &val); + if (ret) + return ret; + + ret = tracing_update_buffers(); + if (ret < 0) + return ret; + + switch (val) { + case 0: + case 1: + ret = -ENODEV; + mutex_lock(&event_mutex); + file = event_file_data(filp); + if (likely(file)) + ret = ftrace_event_enable_disable(file, val); + mutex_unlock(&event_mutex); + break; + + default: + return -EINVAL; + } + + *ppos += cnt; + + return ret ? ret : cnt; +} + +static ssize_t +system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, + loff_t *ppos) +{ + const char set_to_char[4] = { '?', '0', '1', 'X' }; + struct ftrace_subsystem_dir *dir = filp->private_data; + struct event_subsystem *system = dir->subsystem; + struct ftrace_event_call *call; + struct ftrace_event_file *file; + struct trace_array *tr = dir->tr; + char buf[2]; + int set = 0; + int ret; + + mutex_lock(&event_mutex); + list_for_each_entry(file, &tr->events, list) { + call = file->event_call; + if (!ftrace_event_name(call) || !call->class || !call->class->reg) + continue; + + if (system && strcmp(call->class->system, system->name) != 0) + continue; + + /* + * We need to find out if all the events are set + * or if all events or cleared, or if we have + * a mixture. + */ + set |= (1 << !!(file->flags & FTRACE_EVENT_FL_ENABLED)); + + /* + * If we have a mixture, no need to look further. + */ + if (set == 3) + break; + } + mutex_unlock(&event_mutex); + + buf[0] = set_to_char[set]; + buf[1] = '\n'; + + ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); + + return ret; +} + +static ssize_t +system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, + loff_t *ppos) +{ + struct ftrace_subsystem_dir *dir = filp->private_data; + struct event_subsystem *system = dir->subsystem; + const char *name = NULL; + unsigned long val; + ssize_t ret; + + ret = kstrtoul_from_user(ubuf, cnt, 10, &val); + if (ret) + return ret; + + ret = tracing_update_buffers(); + if (ret < 0) + return ret; + + if (val != 0 && val != 1) + return -EINVAL; + + /* + * Opening of "enable" adds a ref count to system, + * so the name is safe to use. + */ + if (system) + name = system->name; + + ret = __ftrace_set_clr_event(dir->tr, NULL, name, NULL, val); + if (ret) + goto out; + + ret = cnt; + +out: + *ppos += cnt; + + return ret; +} + +enum { + FORMAT_HEADER = 1, + FORMAT_FIELD_SEPERATOR = 2, + FORMAT_PRINTFMT = 3, +}; + +static void *f_next(struct seq_file *m, void *v, loff_t *pos) +{ + struct ftrace_event_call *call = event_file_data(m->private); + struct list_head *common_head = &ftrace_common_fields; + struct list_head *head = trace_get_fields(call); + struct list_head *node = v; + + (*pos)++; + + switch ((unsigned long)v) { + case FORMAT_HEADER: + node = common_head; + break; + + case FORMAT_FIELD_SEPERATOR: + node = head; + break; + + case FORMAT_PRINTFMT: + /* all done */ + return NULL; + } + + node = node->prev; + if (node == common_head) + return (void *)FORMAT_FIELD_SEPERATOR; + else if (node == head) + return (void *)FORMAT_PRINTFMT; + else + return node; +} + +static int f_show(struct seq_file *m, void *v) +{ + struct ftrace_event_call *call = event_file_data(m->private); + struct ftrace_event_field *field; + const char *array_descriptor; + + switch ((unsigned long)v) { + case FORMAT_HEADER: + seq_printf(m, "name: %s\n", ftrace_event_name(call)); + seq_printf(m, "ID: %d\n", call->event.type); + seq_puts(m, "format:\n"); + return 0; + + case FORMAT_FIELD_SEPERATOR: + seq_putc(m, '\n'); + return 0; + + case FORMAT_PRINTFMT: + seq_printf(m, "\nprint fmt: %s\n", + call->print_fmt); + return 0; + } + + field = list_entry(v, struct ftrace_event_field, link); + /* + * Smartly shows the array type(except dynamic array). + * Normal: + * field:TYPE VAR + * If TYPE := TYPE[LEN], it is shown: + * field:TYPE VAR[LEN] + */ + array_descriptor = strchr(field->type, '['); + + if (!strncmp(field->type, "__data_loc", 10)) + array_descriptor = NULL; + + if (!array_descriptor) + seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", + field->type, field->name, field->offset, + field->size, !!field->is_signed); + else + seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", + (int)(array_descriptor - field->type), + field->type, field->name, + array_descriptor, field->offset, + field->size, !!field->is_signed); + + return 0; +} + +static void *f_start(struct seq_file *m, loff_t *pos) +{ + void *p = (void *)FORMAT_HEADER; + loff_t l = 0; + + /* ->stop() is called even if ->start() fails */ + mutex_lock(&event_mutex); + if (!event_file_data(m->private)) + return ERR_PTR(-ENODEV); + + while (l < *pos && p) + p = f_next(m, p, &l); + + return p; +} + +static void f_stop(struct seq_file *m, void *p) +{ + mutex_unlock(&event_mutex); +} + +static const struct seq_operations trace_format_seq_ops = { + .start = f_start, + .next = f_next, + .stop = f_stop, + .show = f_show, +}; + +static int trace_format_open(struct inode *inode, struct file *file) +{ + struct seq_file *m; + int ret; + + ret = seq_open(file, &trace_format_seq_ops); + if (ret < 0) + return ret; + + m = file->private_data; + m->private = file; + + return 0; +} + +static ssize_t +event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) +{ + int id = (long)event_file_data(filp); + char buf[32]; + int len; + + if (*ppos) + return 0; + + if (unlikely(!id)) + return -ENODEV; + + len = sprintf(buf, "%d\n", id); + + return simple_read_from_buffer(ubuf, cnt, ppos, buf, len); +} + +static ssize_t +event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, + loff_t *ppos) +{ + struct ftrace_event_file *file; + struct trace_seq *s; + int r = -ENODEV; + + if (*ppos) + return 0; + + s = kmalloc(sizeof(*s), GFP_KERNEL); + + if (!s) + return -ENOMEM; + + trace_seq_init(s); + + mutex_lock(&event_mutex); + file = event_file_data(filp); + if (file) + print_event_filter(file, s); + mutex_unlock(&event_mutex); + + if (file) + r = simple_read_from_buffer(ubuf, cnt, ppos, + s->buffer, trace_seq_used(s)); + + kfree(s); + + return r; +} + +static ssize_t +event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, + loff_t *ppos) +{ + struct ftrace_event_file *file; + char *buf; + int err = -ENODEV; + + if (cnt >= PAGE_SIZE) + return -EINVAL; + + buf = (char *)__get_free_page(GFP_TEMPORARY); + if (!buf) + return -ENOMEM; + + if (copy_from_user(buf, ubuf, cnt)) { + free_page((unsigned long) buf); + return -EFAULT; + } + buf[cnt] = '\0'; + + mutex_lock(&event_mutex); + file = event_file_data(filp); + if (file) + err = apply_event_filter(file, buf); + mutex_unlock(&event_mutex); + + free_page((unsigned long) buf); + if (err < 0) + return err; + + *ppos += cnt; + + return cnt; +} + +static LIST_HEAD(event_subsystems); + +static int subsystem_open(struct inode *inode, struct file *filp) +{ + struct event_subsystem *system = NULL; + struct ftrace_subsystem_dir *dir = NULL; /* Initialize for gcc */ + struct trace_array *tr; + int ret; + + if (tracing_is_disabled()) + return -ENODEV; + + /* Make sure the system still exists */ + mutex_lock(&trace_types_lock); + mutex_lock(&event_mutex); + list_for_each_entry(tr, &ftrace_trace_arrays, list) { + list_for_each_entry(dir, &tr->systems, list) { + if (dir == inode->i_private) { + /* Don't open systems with no events */ + if (dir->nr_events) { + __get_system_dir(dir); + system = dir->subsystem; + } + goto exit_loop; + } + } + } + exit_loop: + mutex_unlock(&event_mutex); + mutex_unlock(&trace_types_lock); + + if (!system) + return -ENODEV; + + /* Some versions of gcc think dir can be uninitialized here */ + WARN_ON(!dir); + + /* Still need to increment the ref count of the system */ + if (trace_array_get(tr) < 0) { + put_system(dir); + return -ENODEV; + } + + ret = tracing_open_generic(inode, filp); + if (ret < 0) { + trace_array_put(tr); + put_system(dir); + } + + return ret; +} + +static int system_tr_open(struct inode *inode, struct file *filp) +{ + struct ftrace_subsystem_dir *dir; + struct trace_array *tr = inode->i_private; + int ret; + + if (tracing_is_disabled()) + return -ENODEV; + + if (trace_array_get(tr) < 0) + return -ENODEV; + + /* Make a temporary dir that has no system but points to tr */ + dir = kzalloc(sizeof(*dir), GFP_KERNEL); + if (!dir) { + trace_array_put(tr); + return -ENOMEM; + } + + dir->tr = tr; + + ret = tracing_open_generic(inode, filp); + if (ret < 0) { + trace_array_put(tr); + kfree(dir); + return ret; + } + + filp->private_data = dir; + + return 0; +} + +static int subsystem_release(struct inode *inode, struct file *file) +{ + struct ftrace_subsystem_dir *dir = file->private_data; + + trace_array_put(dir->tr); + + /* + * If dir->subsystem is NULL, then this is a temporary + * descriptor that was made for a trace_array to enable + * all subsystems. + */ + if (dir->subsystem) + put_system(dir); + else + kfree(dir); + + return 0; +} + +static ssize_t +subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, + loff_t *ppos) +{ + struct ftrace_subsystem_dir *dir = filp->private_data; + struct event_subsystem *system = dir->subsystem; + struct trace_seq *s; + int r; + + if (*ppos) + return 0; + + s = kmalloc(sizeof(*s), GFP_KERNEL); + if (!s) + return -ENOMEM; + + trace_seq_init(s); + + print_subsystem_event_filter(system, s); + r = simple_read_from_buffer(ubuf, cnt, ppos, + s->buffer, trace_seq_used(s)); + + kfree(s); + + return r; +} + +static ssize_t +subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, + loff_t *ppos) +{ + struct ftrace_subsystem_dir *dir = filp->private_data; + char *buf; + int err; + + if (cnt >= PAGE_SIZE) + return -EINVAL; + + buf = (char *)__get_free_page(GFP_TEMPORARY); + if (!buf) + return -ENOMEM; + + if (copy_from_user(buf, ubuf, cnt)) { + free_page((unsigned long) buf); + return -EFAULT; + } + buf[cnt] = '\0'; + + err = apply_subsystem_event_filter(dir, buf); + free_page((unsigned long) buf); + if (err < 0) + return err; + + *ppos += cnt; + + return cnt; +} + +static ssize_t +show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) +{ + int (*func)(struct trace_seq *s) = filp->private_data; + struct trace_seq *s; + int r; + + if (*ppos) + return 0; + + s = kmalloc(sizeof(*s), GFP_KERNEL); + if (!s) + return -ENOMEM; + + trace_seq_init(s); + + func(s); + r = simple_read_from_buffer(ubuf, cnt, ppos, + s->buffer, trace_seq_used(s)); + + kfree(s); + + return r; +} + +static int ftrace_event_avail_open(struct inode *inode, struct file *file); +static int ftrace_event_set_open(struct inode *inode, struct file *file); +static int ftrace_event_release(struct inode *inode, struct file *file); + +static const struct seq_operations show_event_seq_ops = { + .start = t_start, + .next = t_next, + .show = t_show, + .stop = t_stop, +}; + +static const struct seq_operations show_set_event_seq_ops = { + .start = s_start, + .next = s_next, + .show = t_show, + .stop = t_stop, +}; + +static const struct file_operations ftrace_avail_fops = { + .open = ftrace_event_avail_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release, +}; + +static const struct file_operations ftrace_set_event_fops = { + .open = ftrace_event_set_open, + .read = seq_read, + .write = ftrace_event_write, + .llseek = seq_lseek, + .release = ftrace_event_release, +}; + +static const struct file_operations ftrace_enable_fops = { + .open = tracing_open_generic, + .read = event_enable_read, + .write = event_enable_write, + .llseek = default_llseek, +}; + +static const struct file_operations ftrace_event_format_fops = { + .open = trace_format_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release, +}; + +static const struct file_operations ftrace_event_id_fops = { + .read = event_id_read, + .llseek = default_llseek, +}; + +static const struct file_operations ftrace_event_filter_fops = { + .open = tracing_open_generic, + .read = event_filter_read, + .write = event_filter_write, + .llseek = default_llseek, +}; + +static const struct file_operations ftrace_subsystem_filter_fops = { + .open = subsystem_open, + .read = subsystem_filter_read, + .write = subsystem_filter_write, + .llseek = default_llseek, + .release = subsystem_release, +}; + +static const struct file_operations ftrace_system_enable_fops = { + .open = subsystem_open, + .read = system_enable_read, + .write = system_enable_write, + .llseek = default_llseek, + .release = subsystem_release, +}; + +static const struct file_operations ftrace_tr_enable_fops = { + .open = system_tr_open, + .read = system_enable_read, + .write = system_enable_write, + .llseek = default_llseek, + .release = subsystem_release, +}; + +static const struct file_operations ftrace_show_header_fops = { + .open = tracing_open_generic, + .read = show_header, + .llseek = default_llseek, +}; + +static int +ftrace_event_open(struct inode *inode, struct file *file, + const struct seq_operations *seq_ops) +{ + struct seq_file *m; + int ret; + + ret = seq_open(file, seq_ops); + if (ret < 0) + return ret; + m = file->private_data; + /* copy tr over to seq ops */ + m->private = inode->i_private; + + return ret; +} + +static int ftrace_event_release(struct inode *inode, struct file *file) +{ + struct trace_array *tr = inode->i_private; + + trace_array_put(tr); + + return seq_release(inode, file); +} + +static int +ftrace_event_avail_open(struct inode *inode, struct file *file) +{ + const struct seq_operations *seq_ops = &show_event_seq_ops; + + return ftrace_event_open(inode, file, seq_ops); +} + +static int +ftrace_event_set_open(struct inode *inode, struct file *file) +{ + const struct seq_operations *seq_ops = &show_set_event_seq_ops; + struct trace_array *tr = inode->i_private; + int ret; + + if (trace_array_get(tr) < 0) + return -ENODEV; + + if ((file->f_mode & FMODE_WRITE) && + (file->f_flags & O_TRUNC)) + ftrace_clear_events(tr); + + ret = ftrace_event_open(inode, file, seq_ops); + if (ret < 0) + trace_array_put(tr); + return ret; +} + +static struct event_subsystem * +create_new_subsystem(const char *name) +{ + struct event_subsystem *system; + + /* need to create new entry */ + system = kmalloc(sizeof(*system), GFP_KERNEL); + if (!system) + return NULL; + + system->ref_count = 1; + + /* Only allocate if dynamic (kprobes and modules) */ + if (!core_kernel_data((unsigned long)name)) { + system->ref_count |= SYSTEM_FL_FREE_NAME; + system->name = kstrdup(name, GFP_KERNEL); + if (!system->name) + goto out_free; + } else + system->name = name; + + system->filter = NULL; + + system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); + if (!system->filter) + goto out_free; + + list_add(&system->list, &event_subsystems); + + return system; + + out_free: + if (system->ref_count & SYSTEM_FL_FREE_NAME) + kfree(system->name); + kfree(system); + return NULL; +} + +static struct dentry * +event_subsystem_dir(struct trace_array *tr, const char *name, + struct ftrace_event_file *file, struct dentry *parent) +{ + struct ftrace_subsystem_dir *dir; + struct event_subsystem *system; + struct dentry *entry; + + /* First see if we did not already create this dir */ + list_for_each_entry(dir, &tr->systems, list) { + system = dir->subsystem; + if (strcmp(system->name, name) == 0) { + dir->nr_events++; + file->system = dir; + return dir->entry; + } + } + + /* Now see if the system itself exists. */ + list_for_each_entry(system, &event_subsystems, list) { + if (strcmp(system->name, name) == 0) + break; + } + /* Reset system variable when not found */ + if (&system->list == &event_subsystems) + system = NULL; + + dir = kmalloc(sizeof(*dir), GFP_KERNEL); + if (!dir) + goto out_fail; + + if (!system) { + system = create_new_subsystem(name); + if (!system) + goto out_free; + } else + __get_system(system); + + dir->entry = tracefs_create_dir(name, parent); + if (!dir->entry) { + pr_warn("Failed to create system directory %s\n", name); + __put_system(system); + goto out_free; + } + + dir->tr = tr; + dir->ref_count = 1; + dir->nr_events = 1; + dir->subsystem = system; + file->system = dir; + + entry = tracefs_create_file("filter", 0644, dir->entry, dir, + &ftrace_subsystem_filter_fops); + if (!entry) { + kfree(system->filter); + system->filter = NULL; + pr_warn("Could not create tracefs '%s/filter' entry\n", name); + } + + trace_create_file("enable", 0644, dir->entry, dir, + &ftrace_system_enable_fops); + + list_add(&dir->list, &tr->systems); + + return dir->entry; + + out_free: + kfree(dir); + out_fail: + /* Only print this message if failed on memory allocation */ + if (!dir || !system) + pr_warn("No memory to create event subsystem %s\n", name); + return NULL; +} + +static int +event_create_dir(struct dentry *parent, struct ftrace_event_file *file) +{ + struct ftrace_event_call *call = file->event_call; + struct trace_array *tr = file->tr; + struct list_head *head; + struct dentry *d_events; + const char *name; + int ret; + + /* + * If the trace point header did not define TRACE_SYSTEM + * then the system would be called "TRACE_SYSTEM". + */ + if (strcmp(call->class->system, TRACE_SYSTEM) != 0) { + d_events = event_subsystem_dir(tr, call->class->system, file, parent); + if (!d_events) + return -ENOMEM; + } else + d_events = parent; + + name = ftrace_event_name(call); + file->dir = tracefs_create_dir(name, d_events); + if (!file->dir) { + pr_warn("Could not create tracefs '%s' directory\n", name); + return -1; + } + + if (call->class->reg && !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) + trace_create_file("enable", 0644, file->dir, file, + &ftrace_enable_fops); + +#ifdef CONFIG_PERF_EVENTS + if (call->event.type && call->class->reg) + trace_create_file("id", 0444, file->dir, + (void *)(long)call->event.type, + &ftrace_event_id_fops); +#endif + + /* + * Other events may have the same class. Only update + * the fields if they are not already defined. + */ + head = trace_get_fields(call); + if (list_empty(head)) { + ret = call->class->define_fields(call); + if (ret < 0) { + pr_warn("Could not initialize trace point events/%s\n", + name); + return -1; + } + } + trace_create_file("filter", 0644, file->dir, file, + &ftrace_event_filter_fops); + + trace_create_file("trigger", 0644, file->dir, file, + &event_trigger_fops); + + trace_create_file("format", 0444, file->dir, call, + &ftrace_event_format_fops); + + return 0; +} + +static void remove_event_from_tracers(struct ftrace_event_call *call) +{ + struct ftrace_event_file *file; + struct trace_array *tr; + + do_for_each_event_file_safe(tr, file) { + if (file->event_call != call) + continue; + + remove_event_file_dir(file); + /* + * The do_for_each_event_file_safe() is + * a double loop. After finding the call for this + * trace_array, we use break to jump to the next + * trace_array. + */ + break; + } while_for_each_event_file(); +} + +static void event_remove(struct ftrace_event_call *call) +{ + struct trace_array *tr; + struct ftrace_event_file *file; + + do_for_each_event_file(tr, file) { + if (file->event_call != call) + continue; + ftrace_event_enable_disable(file, 0); + /* + * The do_for_each_event_file() is + * a double loop. After finding the call for this + * trace_array, we use break to jump to the next + * trace_array. + */ + break; + } while_for_each_event_file(); + + if (call->event.funcs) + __unregister_ftrace_event(&call->event); + remove_event_from_tracers(call); + list_del(&call->list); +} + +static int event_init(struct ftrace_event_call *call) +{ + int ret = 0; + const char *name; + + name = ftrace_event_name(call); + if (WARN_ON(!name)) + return -EINVAL; + + if (call->class->raw_init) { + ret = call->class->raw_init(call); + if (ret < 0 && ret != -ENOSYS) + pr_warn("Could not initialize trace events/%s\n", name); + } + + return ret; +} + +static int +__register_event(struct ftrace_event_call *call, struct module *mod) +{ + int ret; + + ret = event_init(call); + if (ret < 0) + return ret; + + list_add(&call->list, &ftrace_events); + call->mod = mod; + + return 0; +} + +static char *enum_replace(char *ptr, struct trace_enum_map *map, int len) +{ + int rlen; + int elen; + + /* Find the length of the enum value as a string */ + elen = snprintf(ptr, 0, "%ld", map->enum_value); + /* Make sure there's enough room to replace the string with the value */ + if (len < elen) + return NULL; + + snprintf(ptr, elen + 1, "%ld", map->enum_value); + + /* Get the rest of the string of ptr */ + rlen = strlen(ptr + len); + memmove(ptr + elen, ptr + len, rlen); + /* Make sure we end the new string */ + ptr[elen + rlen] = 0; + + return ptr + elen; +} + +static void update_event_printk(struct ftrace_event_call *call, + struct trace_enum_map *map) +{ + char *ptr; + int quote = 0; + int len = strlen(map->enum_string); + + for (ptr = call->print_fmt; *ptr; ptr++) { + if (*ptr == '\\') { + ptr++; + /* paranoid */ + if (!*ptr) + break; + continue; + } + if (*ptr == '"') { + quote ^= 1; + continue; + } + if (quote) + continue; + if (isdigit(*ptr)) { + /* skip numbers */ + do { + ptr++; + /* Check for alpha chars like ULL */ + } while (isalnum(*ptr)); + if (!*ptr) + break; + /* + * A number must have some kind of delimiter after + * it, and we can ignore that too. + */ + continue; + } + if (isalpha(*ptr) || *ptr == '_') { + if (strncmp(map->enum_string, ptr, len) == 0 && + !isalnum(ptr[len]) && ptr[len] != '_') { + ptr = enum_replace(ptr, map, len); + /* Hmm, enum string smaller than value */ + if (WARN_ON_ONCE(!ptr)) + return; + /* + * No need to decrement here, as enum_replace() + * returns the pointer to the character passed + * the enum, and two enums can not be placed + * back to back without something in between. + * We can skip that something in between. + */ + continue; + } + skip_more: + do { + ptr++; + } while (isalnum(*ptr) || *ptr == '_'); + if (!*ptr) + break; + /* + * If what comes after this variable is a '.' or + * '->' then we can continue to ignore that string. + */ + if (*ptr == '.' || (ptr[0] == '-' && ptr[1] == '>')) { + ptr += *ptr == '.' ? 1 : 2; + if (!*ptr) + break; + goto skip_more; + } + /* + * Once again, we can skip the delimiter that came + * after the string. + */ + continue; + } + } +} + +void trace_event_enum_update(struct trace_enum_map **map, int len) +{ + struct ftrace_event_call *call, *p; + const char *last_system = NULL; + int last_i; + int i; + + down_write(&trace_event_sem); + list_for_each_entry_safe(call, p, &ftrace_events, list) { + /* events are usually grouped together with systems */ + if (!last_system || call->class->system != last_system) { + last_i = 0; + last_system = call->class->system; + } + + for (i = last_i; i < len; i++) { + if (call->class->system == map[i]->system) { + /* Save the first system if need be */ + if (!last_i) + last_i = i; + update_event_printk(call, map[i]); + } + } + } + up_write(&trace_event_sem); +} + +static struct ftrace_event_file * +trace_create_new_event(struct ftrace_event_call *call, + struct trace_array *tr) +{ + struct ftrace_event_file *file; + + file = kmem_cache_alloc(file_cachep, GFP_TRACE); + if (!file) + return NULL; + + file->event_call = call; + file->tr = tr; + atomic_set(&file->sm_ref, 0); + atomic_set(&file->tm_ref, 0); + INIT_LIST_HEAD(&file->triggers); + list_add(&file->list, &tr->events); + + return file; +} + +/* Add an event to a trace directory */ +static int +__trace_add_new_event(struct ftrace_event_call *call, struct trace_array *tr) +{ + struct ftrace_event_file *file; + + file = trace_create_new_event(call, tr); + if (!file) + return -ENOMEM; + + return event_create_dir(tr->event_dir, file); +} + +/* + * Just create a decriptor for early init. A descriptor is required + * for enabling events at boot. We want to enable events before + * the filesystem is initialized. + */ +static __init int +__trace_early_add_new_event(struct ftrace_event_call *call, + struct trace_array *tr) +{ + struct ftrace_event_file *file; + + file = trace_create_new_event(call, tr); + if (!file) + return -ENOMEM; + + return 0; +} + +struct ftrace_module_file_ops; +static void __add_event_to_tracers(struct ftrace_event_call *call); + +/* Add an additional event_call dynamically */ +int trace_add_event_call(struct ftrace_event_call *call) +{ + int ret; + mutex_lock(&trace_types_lock); + mutex_lock(&event_mutex); + + ret = __register_event(call, NULL); + if (ret >= 0) + __add_event_to_tracers(call); + + mutex_unlock(&event_mutex); + mutex_unlock(&trace_types_lock); + return ret; +} + +/* + * Must be called under locking of trace_types_lock, event_mutex and + * trace_event_sem. + */ +static void __trace_remove_event_call(struct ftrace_event_call *call) +{ + event_remove(call); + trace_destroy_fields(call); + free_event_filter(call->filter); + call->filter = NULL; +} + +static int probe_remove_event_call(struct ftrace_event_call *call) +{ + struct trace_array *tr; + struct ftrace_event_file *file; + +#ifdef CONFIG_PERF_EVENTS + if (call->perf_refcount) + return -EBUSY; +#endif + do_for_each_event_file(tr, file) { + if (file->event_call != call) + continue; + /* + * We can't rely on ftrace_event_enable_disable(enable => 0) + * we are going to do, FTRACE_EVENT_FL_SOFT_MODE can suppress + * TRACE_REG_UNREGISTER. + */ + if (file->flags & FTRACE_EVENT_FL_ENABLED) + return -EBUSY; + /* + * The do_for_each_event_file_safe() is + * a double loop. After finding the call for this + * trace_array, we use break to jump to the next + * trace_array. + */ + break; + } while_for_each_event_file(); + + __trace_remove_event_call(call); + + return 0; +} + +/* Remove an event_call */ +int trace_remove_event_call(struct ftrace_event_call *call) +{ + int ret; + + mutex_lock(&trace_types_lock); + mutex_lock(&event_mutex); + down_write(&trace_event_sem); + ret = probe_remove_event_call(call); + up_write(&trace_event_sem); + mutex_unlock(&event_mutex); + mutex_unlock(&trace_types_lock); + + return ret; +} + +#define for_each_event(event, start, end) \ + for (event = start; \ + (unsigned long)event < (unsigned long)end; \ + event++) + +#ifdef CONFIG_MODULES + +static void trace_module_add_events(struct module *mod) +{ + struct ftrace_event_call **call, **start, **end; + + if (!mod->num_trace_events) + return; + + /* Don't add infrastructure for mods without tracepoints */ + if (trace_module_has_bad_taint(mod)) { + pr_err("%s: module has bad taint, not creating trace events\n", + mod->name); + return; + } + + start = mod->trace_events; + end = mod->trace_events + mod->num_trace_events; + + for_each_event(call, start, end) { + __register_event(*call, mod); + __add_event_to_tracers(*call); + } +} + +static void trace_module_remove_events(struct module *mod) +{ + struct ftrace_event_call *call, *p; + bool clear_trace = false; + + down_write(&trace_event_sem); + list_for_each_entry_safe(call, p, &ftrace_events, list) { + if (call->mod == mod) { + if (call->flags & TRACE_EVENT_FL_WAS_ENABLED) + clear_trace = true; + __trace_remove_event_call(call); + } + } + up_write(&trace_event_sem); + + /* + * It is safest to reset the ring buffer if the module being unloaded + * registered any events that were used. The only worry is if + * a new module gets loaded, and takes on the same id as the events + * of this module. When printing out the buffer, traced events left + * over from this module may be passed to the new module events and + * unexpected results may occur. + */ + if (clear_trace) + tracing_reset_all_online_cpus(); +} + +static int trace_module_notify(struct notifier_block *self, + unsigned long val, void *data) +{ + struct module *mod = data; + + mutex_lock(&trace_types_lock); + mutex_lock(&event_mutex); + switch (val) { + case MODULE_STATE_COMING: + trace_module_add_events(mod); + break; + case MODULE_STATE_GOING: + trace_module_remove_events(mod); + break; + } + mutex_unlock(&event_mutex); + mutex_unlock(&trace_types_lock); + + return 0; +} + +static struct notifier_block trace_module_nb = { + .notifier_call = trace_module_notify, + .priority = 1, /* higher than trace.c module notify */ +}; +#endif /* CONFIG_MODULES */ + +/* Create a new event directory structure for a trace directory. */ +static void +__trace_add_event_dirs(struct trace_array *tr) +{ + struct ftrace_event_call *call; + int ret; + + list_for_each_entry(call, &ftrace_events, list) { + ret = __trace_add_new_event(call, tr); + if (ret < 0) + pr_warn("Could not create directory for event %s\n", + ftrace_event_name(call)); + } +} + +struct ftrace_event_file * +find_event_file(struct trace_array *tr, const char *system, const char *event) +{ + struct ftrace_event_file *file; + struct ftrace_event_call *call; + const char *name; + + list_for_each_entry(file, &tr->events, list) { + + call = file->event_call; + name = ftrace_event_name(call); + + if (!name || !call->class || !call->class->reg) + continue; + + if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) + continue; + + if (strcmp(event, name) == 0 && + strcmp(system, call->class->system) == 0) + return file; + } + return NULL; +} + +#ifdef CONFIG_DYNAMIC_FTRACE + +/* Avoid typos */ +#define ENABLE_EVENT_STR "enable_event" +#define DISABLE_EVENT_STR "disable_event" + +struct event_probe_data { + struct ftrace_event_file *file; + unsigned long count; + int ref; + bool enable; +}; + +static void +event_enable_probe(unsigned long ip, unsigned long parent_ip, void **_data) +{ + struct event_probe_data **pdata = (struct event_probe_data **)_data; + struct event_probe_data *data = *pdata; + + if (!data) + return; + + if (data->enable) + clear_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &data->file->flags); + else + set_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &data->file->flags); +} + +static void +event_enable_count_probe(unsigned long ip, unsigned long parent_ip, void **_data) +{ + struct event_probe_data **pdata = (struct event_probe_data **)_data; + struct event_probe_data *data = *pdata; + + if (!data) + return; + + if (!data->count) + return; + + /* Skip if the event is in a state we want to switch to */ + if (data->enable == !(data->file->flags & FTRACE_EVENT_FL_SOFT_DISABLED)) + return; + + if (data->count != -1) + (data->count)--; + + event_enable_probe(ip, parent_ip, _data); +} + +static int +event_enable_print(struct seq_file *m, unsigned long ip, + struct ftrace_probe_ops *ops, void *_data) +{ + struct event_probe_data *data = _data; + + seq_printf(m, "%ps:", (void *)ip); + + seq_printf(m, "%s:%s:%s", + data->enable ? ENABLE_EVENT_STR : DISABLE_EVENT_STR, + data->file->event_call->class->system, + ftrace_event_name(data->file->event_call)); + + if (data->count == -1) + seq_puts(m, ":unlimited\n"); + else + seq_printf(m, ":count=%ld\n", data->count); + + return 0; +} + +static int +event_enable_init(struct ftrace_probe_ops *ops, unsigned long ip, + void **_data) +{ + struct event_probe_data **pdata = (struct event_probe_data **)_data; + struct event_probe_data *data = *pdata; + + data->ref++; + return 0; +} + +static void +event_enable_free(struct ftrace_probe_ops *ops, unsigned long ip, + void **_data) +{ + struct event_probe_data **pdata = (struct event_probe_data **)_data; + struct event_probe_data *data = *pdata; + + if (WARN_ON_ONCE(data->ref <= 0)) + return; + + data->ref--; + if (!data->ref) { + /* Remove the SOFT_MODE flag */ + __ftrace_event_enable_disable(data->file, 0, 1); + module_put(data->file->event_call->mod); + kfree(data); + } + *pdata = NULL; +} + +static struct ftrace_probe_ops event_enable_probe_ops = { + .func = event_enable_probe, + .print = event_enable_print, + .init = event_enable_init, + .free = event_enable_free, +}; + +static struct ftrace_probe_ops event_enable_count_probe_ops = { + .func = event_enable_count_probe, + .print = event_enable_print, + .init = event_enable_init, + .free = event_enable_free, +}; + +static struct ftrace_probe_ops event_disable_probe_ops = { + .func = event_enable_probe, + .print = event_enable_print, + .init = event_enable_init, + .free = event_enable_free, +}; + +static struct ftrace_probe_ops event_disable_count_probe_ops = { + .func = event_enable_count_probe, + .print = event_enable_print, + .init = event_enable_init, + .free = event_enable_free, +}; + +static int +event_enable_func(struct ftrace_hash *hash, + char *glob, char *cmd, char *param, int enabled) +{ + struct trace_array *tr = top_trace_array(); + struct ftrace_event_file *file; + struct ftrace_probe_ops *ops; + struct event_probe_data *data; + const char *system; + const char *event; + char *number; + bool enable; + int ret; + + if (!tr) + return -ENODEV; + + /* hash funcs only work with set_ftrace_filter */ + if (!enabled || !param) + return -EINVAL; + + system = strsep(¶m, ":"); + if (!param) + return -EINVAL; + + event = strsep(¶m, ":"); + + mutex_lock(&event_mutex); + + ret = -EINVAL; + file = find_event_file(tr, system, event); + if (!file) + goto out; + + enable = strcmp(cmd, ENABLE_EVENT_STR) == 0; + + if (enable) + ops = param ? &event_enable_count_probe_ops : &event_enable_probe_ops; + else + ops = param ? &event_disable_count_probe_ops : &event_disable_probe_ops; + + if (glob[0] == '!') { + unregister_ftrace_function_probe_func(glob+1, ops); + ret = 0; + goto out; + } + + ret = -ENOMEM; + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) + goto out; + + data->enable = enable; + data->count = -1; + data->file = file; + + if (!param) + goto out_reg; + + number = strsep(¶m, ":"); + + ret = -EINVAL; + if (!strlen(number)) + goto out_free; + + /* + * We use the callback data field (which is a pointer) + * as our counter. + */ + ret = kstrtoul(number, 0, &data->count); + if (ret) + goto out_free; + + out_reg: + /* Don't let event modules unload while probe registered */ + ret = try_module_get(file->event_call->mod); + if (!ret) { + ret = -EBUSY; + goto out_free; + } + + ret = __ftrace_event_enable_disable(file, 1, 1); + if (ret < 0) + goto out_put; + ret = register_ftrace_function_probe(glob, ops, data); + /* + * The above returns on success the # of functions enabled, + * but if it didn't find any functions it returns zero. + * Consider no functions a failure too. + */ + if (!ret) { + ret = -ENOENT; + goto out_disable; + } else if (ret < 0) + goto out_disable; + /* Just return zero, not the number of enabled functions */ + ret = 0; + out: + mutex_unlock(&event_mutex); + return ret; + + out_disable: + __ftrace_event_enable_disable(file, 0, 1); + out_put: + module_put(file->event_call->mod); + out_free: + kfree(data); + goto out; +} + +static struct ftrace_func_command event_enable_cmd = { + .name = ENABLE_EVENT_STR, + .func = event_enable_func, +}; + +static struct ftrace_func_command event_disable_cmd = { + .name = DISABLE_EVENT_STR, + .func = event_enable_func, +}; + +static __init int register_event_cmds(void) +{ + int ret; + + ret = register_ftrace_command(&event_enable_cmd); + if (WARN_ON(ret < 0)) + return ret; + ret = register_ftrace_command(&event_disable_cmd); + if (WARN_ON(ret < 0)) + unregister_ftrace_command(&event_enable_cmd); + return ret; +} +#else +static inline int register_event_cmds(void) { return 0; } +#endif /* CONFIG_DYNAMIC_FTRACE */ + +/* + * The top level array has already had its ftrace_event_file + * descriptors created in order to allow for early events to + * be recorded. This function is called after the tracefs has been + * initialized, and we now have to create the files associated + * to the events. + */ +static __init void +__trace_early_add_event_dirs(struct trace_array *tr) +{ + struct ftrace_event_file *file; + int ret; + + + list_for_each_entry(file, &tr->events, list) { + ret = event_create_dir(tr->event_dir, file); + if (ret < 0) + pr_warn("Could not create directory for event %s\n", + ftrace_event_name(file->event_call)); + } +} + +/* + * For early boot up, the top trace array requires to have + * a list of events that can be enabled. This must be done before + * the filesystem is set up in order to allow events to be traced + * early. + */ +static __init void +__trace_early_add_events(struct trace_array *tr) +{ + struct ftrace_event_call *call; + int ret; + + list_for_each_entry(call, &ftrace_events, list) { + /* Early boot up should not have any modules loaded */ + if (WARN_ON_ONCE(call->mod)) + continue; + + ret = __trace_early_add_new_event(call, tr); + if (ret < 0) + pr_warn("Could not create early event %s\n", + ftrace_event_name(call)); + } +} + +/* Remove the event directory structure for a trace directory. */ +static void +__trace_remove_event_dirs(struct trace_array *tr) +{ + struct ftrace_event_file *file, *next; + + list_for_each_entry_safe(file, next, &tr->events, list) + remove_event_file_dir(file); +} + +static void __add_event_to_tracers(struct ftrace_event_call *call) +{ + struct trace_array *tr; + + list_for_each_entry(tr, &ftrace_trace_arrays, list) + __trace_add_new_event(call, tr); +} + +extern struct ftrace_event_call *__start_ftrace_events[]; +extern struct ftrace_event_call *__stop_ftrace_events[]; + +static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; + +static __init int setup_trace_event(char *str) +{ + strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); + ring_buffer_expanded = true; + tracing_selftest_disabled = true; + + return 1; +} +__setup("trace_event=", setup_trace_event); + +/* Expects to have event_mutex held when called */ +static int +create_event_toplevel_files(struct dentry *parent, struct trace_array *tr) +{ + struct dentry *d_events; + struct dentry *entry; + + entry = tracefs_create_file("set_event", 0644, parent, + tr, &ftrace_set_event_fops); + if (!entry) { + pr_warn("Could not create tracefs 'set_event' entry\n"); + return -ENOMEM; + } + + d_events = tracefs_create_dir("events", parent); + if (!d_events) { + pr_warn("Could not create tracefs 'events' directory\n"); + return -ENOMEM; + } + + /* ring buffer internal formats */ + trace_create_file("header_page", 0444, d_events, + ring_buffer_print_page_header, + &ftrace_show_header_fops); + + trace_create_file("header_event", 0444, d_events, + ring_buffer_print_entry_header, + &ftrace_show_header_fops); + + trace_create_file("enable", 0644, d_events, + tr, &ftrace_tr_enable_fops); + + tr->event_dir = d_events; + + return 0; +} + +/** + * event_trace_add_tracer - add a instance of a trace_array to events + * @parent: The parent dentry to place the files/directories for events in + * @tr: The trace array associated with these events + * + * When a new instance is created, it needs to set up its events + * directory, as well as other files associated with events. It also + * creates the event hierachry in the @parent/events directory. + * + * Returns 0 on success. + */ +int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr) +{ + int ret; + + mutex_lock(&event_mutex); + + ret = create_event_toplevel_files(parent, tr); + if (ret) + goto out_unlock; + + down_write(&trace_event_sem); + __trace_add_event_dirs(tr); + up_write(&trace_event_sem); + + out_unlock: + mutex_unlock(&event_mutex); + + return ret; +} + +/* + * The top trace array already had its file descriptors created. + * Now the files themselves need to be created. + */ +static __init int +early_event_add_tracer(struct dentry *parent, struct trace_array *tr) +{ + int ret; + + mutex_lock(&event_mutex); + + ret = create_event_toplevel_files(parent, tr); + if (ret) + goto out_unlock; + + down_write(&trace_event_sem); + __trace_early_add_event_dirs(tr); + up_write(&trace_event_sem); + + out_unlock: + mutex_unlock(&event_mutex); + + return ret; +} + +int event_trace_del_tracer(struct trace_array *tr) +{ + mutex_lock(&event_mutex); + + /* Disable any event triggers and associated soft-disabled events */ + clear_event_triggers(tr); + + /* Disable any running events */ + __ftrace_set_clr_event_nolock(tr, NULL, NULL, NULL, 0); + + /* Access to events are within rcu_read_lock_sched() */ + synchronize_sched(); + + down_write(&trace_event_sem); + __trace_remove_event_dirs(tr); + tracefs_remove_recursive(tr->event_dir); + up_write(&trace_event_sem); + + tr->event_dir = NULL; + + mutex_unlock(&event_mutex); + + return 0; +} + +static __init int event_trace_memsetup(void) +{ + field_cachep = KMEM_CACHE(ftrace_event_field, SLAB_PANIC); + file_cachep = KMEM_CACHE(ftrace_event_file, SLAB_PANIC); + return 0; +} + +static __init void +early_enable_events(struct trace_array *tr, bool disable_first) +{ + char *buf = bootup_event_buf; + char *token; + int ret; + + while (true) { + token = strsep(&buf, ","); + + if (!token) + break; + if (!*token) + continue; + + /* Restarting syscalls requires that we stop them first */ + if (disable_first) + ftrace_set_clr_event(tr, token, 0); + + ret = ftrace_set_clr_event(tr, token, 1); + if (ret) + pr_warn("Failed to enable trace event: %s\n", token); + + /* Put back the comma to allow this to be called again */ + if (buf) + *(buf - 1) = ','; + } +} + +static __init int event_trace_enable(void) +{ + struct trace_array *tr = top_trace_array(); + struct ftrace_event_call **iter, *call; + int ret; + + if (!tr) + return -ENODEV; + + for_each_event(iter, __start_ftrace_events, __stop_ftrace_events) { + + call = *iter; + ret = event_init(call); + if (!ret) + list_add(&call->list, &ftrace_events); + } + + /* + * We need the top trace array to have a working set of trace + * points at early init, before the debug files and directories + * are created. Create the file entries now, and attach them + * to the actual file dentries later. + */ + __trace_early_add_events(tr); + + early_enable_events(tr, false); + + trace_printk_start_comm(); + + register_event_cmds(); + + register_trigger_cmds(); + + return 0; +} + +/* + * event_trace_enable() is called from trace_event_init() first to + * initialize events and perhaps start any events that are on the + * command line. Unfortunately, there are some events that will not + * start this early, like the system call tracepoints that need + * to set the TIF_SYSCALL_TRACEPOINT flag of pid 1. But event_trace_enable() + * is called before pid 1 starts, and this flag is never set, making + * the syscall tracepoint never get reached, but the event is enabled + * regardless (and not doing anything). + */ +static __init int event_trace_enable_again(void) +{ + struct trace_array *tr; + + tr = top_trace_array(); + if (!tr) + return -ENODEV; + + early_enable_events(tr, true); + + return 0; +} + +early_initcall(event_trace_enable_again); + +static __init int event_trace_init(void) +{ + struct trace_array *tr; + struct dentry *d_tracer; + struct dentry *entry; + int ret; + + tr = top_trace_array(); + if (!tr) + return -ENODEV; + + d_tracer = tracing_init_dentry(); + if (IS_ERR(d_tracer)) + return 0; + + entry = tracefs_create_file("available_events", 0444, d_tracer, + tr, &ftrace_avail_fops); + if (!entry) + pr_warn("Could not create tracefs 'available_events' entry\n"); + + if (trace_define_common_fields()) + pr_warn("tracing: Failed to allocate common fields"); + + ret = early_event_add_tracer(d_tracer, tr); + if (ret) + return ret; + +#ifdef CONFIG_MODULES + ret = register_module_notifier(&trace_module_nb); + if (ret) + pr_warn("Failed to register trace events module notifier\n"); +#endif + return 0; +} + +void __init trace_event_init(void) +{ + event_trace_memsetup(); + init_ftrace_syscalls(); + event_trace_enable(); +} + +fs_initcall(event_trace_init); + +#ifdef CONFIG_FTRACE_STARTUP_TEST + +static DEFINE_SPINLOCK(test_spinlock); +static DEFINE_SPINLOCK(test_spinlock_irq); +static DEFINE_MUTEX(test_mutex); + +static __init void test_work(struct work_struct *dummy) +{ + spin_lock(&test_spinlock); + spin_lock_irq(&test_spinlock_irq); + udelay(1); + spin_unlock_irq(&test_spinlock_irq); + spin_unlock(&test_spinlock); + + mutex_lock(&test_mutex); + msleep(1); + mutex_unlock(&test_mutex); +} + +static __init int event_test_thread(void *unused) +{ + void *test_malloc; + + test_malloc = kmalloc(1234, GFP_KERNEL); + if (!test_malloc) + pr_info("failed to kmalloc\n"); + + schedule_on_each_cpu(test_work); + + kfree(test_malloc); + + set_current_state(TASK_INTERRUPTIBLE); + while (!kthread_should_stop()) { + schedule(); + set_current_state(TASK_INTERRUPTIBLE); + } + __set_current_state(TASK_RUNNING); + + return 0; +} + +/* + * Do various things that may trigger events. + */ +static __init void event_test_stuff(void) +{ + struct task_struct *test_thread; + + test_thread = kthread_run(event_test_thread, NULL, "test-events"); + msleep(1); + kthread_stop(test_thread); +} + +/* + * For every trace event defined, we will test each trace point separately, + * and then by groups, and finally all trace points. + */ +static __init void event_trace_self_tests(void) +{ + struct ftrace_subsystem_dir *dir; + struct ftrace_event_file *file; + struct ftrace_event_call *call; + struct event_subsystem *system; + struct trace_array *tr; + int ret; + + tr = top_trace_array(); + if (!tr) + return; + + pr_info("Running tests on trace events:\n"); + + list_for_each_entry(file, &tr->events, list) { + + call = file->event_call; + + /* Only test those that have a probe */ + if (!call->class || !call->class->probe) + continue; + +/* + * Testing syscall events here is pretty useless, but + * we still do it if configured. But this is time consuming. + * What we really need is a user thread to perform the + * syscalls as we test. + */ +#ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS + if (call->class->system && + strcmp(call->class->system, "syscalls") == 0) + continue; +#endif + + pr_info("Testing event %s: ", ftrace_event_name(call)); + + /* + * If an event is already enabled, someone is using + * it and the self test should not be on. + */ + if (file->flags & FTRACE_EVENT_FL_ENABLED) { + pr_warn("Enabled event during self test!\n"); + WARN_ON_ONCE(1); + continue; + } + + ftrace_event_enable_disable(file, 1); + event_test_stuff(); + ftrace_event_enable_disable(file, 0); + + pr_cont("OK\n"); + } + + /* Now test at the sub system level */ + + pr_info("Running tests on trace event systems:\n"); + + list_for_each_entry(dir, &tr->systems, list) { + + system = dir->subsystem; + + /* the ftrace system is special, skip it */ + if (strcmp(system->name, "ftrace") == 0) + continue; + + pr_info("Testing event system %s: ", system->name); + + ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 1); + if (WARN_ON_ONCE(ret)) { + pr_warn("error enabling system %s\n", + system->name); + continue; + } + + event_test_stuff(); + + ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 0); + if (WARN_ON_ONCE(ret)) { + pr_warn("error disabling system %s\n", + system->name); + continue; + } + + pr_cont("OK\n"); + } + + /* Test with all events enabled */ + + pr_info("Running tests on all trace events:\n"); + pr_info("Testing all events: "); + + ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 1); + if (WARN_ON_ONCE(ret)) { + pr_warn("error enabling all events\n"); + return; + } + + event_test_stuff(); + + /* reset sysname */ + ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0); + if (WARN_ON_ONCE(ret)) { + pr_warn("error disabling all events\n"); + return; + } + + pr_cont("OK\n"); +} + +#ifdef CONFIG_FUNCTION_TRACER + +static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); + +static void +function_test_events_call(unsigned long ip, unsigned long parent_ip, + struct ftrace_ops *op, struct pt_regs *pt_regs) +{ + struct ring_buffer_event *event; + struct ring_buffer *buffer; + struct ftrace_entry *entry; + unsigned long flags; + long disabled; + int cpu; + int pc; + + pc = preempt_count(); + preempt_disable_notrace(); + cpu = raw_smp_processor_id(); + disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); + + if (disabled != 1) + goto out; + + local_save_flags(flags); + + event = trace_current_buffer_lock_reserve(&buffer, + TRACE_FN, sizeof(*entry), + flags, pc); + if (!event) + goto out; + entry = ring_buffer_event_data(event); + entry->ip = ip; + entry->parent_ip = parent_ip; + + trace_buffer_unlock_commit(buffer, event, flags, pc); + + out: + atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); + preempt_enable_notrace(); +} + +static struct ftrace_ops trace_ops __initdata = +{ + .func = function_test_events_call, + .flags = FTRACE_OPS_FL_RECURSION_SAFE, +}; + +static __init void event_trace_self_test_with_function(void) +{ + int ret; + ret = register_ftrace_function(&trace_ops); + if (WARN_ON(ret < 0)) { + pr_info("Failed to enable function tracer for event tests\n"); + return; + } + pr_info("Running tests again, along with the function tracer\n"); + event_trace_self_tests(); + unregister_ftrace_function(&trace_ops); +} +#else +static __init void event_trace_self_test_with_function(void) +{ +} +#endif + +static __init int event_trace_self_tests_init(void) +{ + if (!tracing_selftest_disabled) { + event_trace_self_tests(); + event_trace_self_test_with_function(); + } + + return 0; +} + +late_initcall(event_trace_self_tests_init); + +#endif |