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- /*
- * 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/bsearch.h>
- #include <linux/module.h>
- #include <linux/ctype.h>
- #include <linux/sort.h>
- #include <linux/slab.h>
- #include <linux/delay.h>
- #include <trace/events/sched.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_generic_fields);
- 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;
- static inline int system_refcount(struct event_subsystem *system)
- {
- return system->ref_count;
- }
- static int system_refcount_inc(struct event_subsystem *system)
- {
- return system->ref_count++;
- }
- static int system_refcount_dec(struct event_subsystem *system)
- {
- return --system->ref_count;
- }
- /* 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 trace_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 trace_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 trace_event_call *call, char *name)
- {
- struct ftrace_event_field *field;
- struct list_head *head;
- head = trace_get_fields(call);
- field = __find_event_field(head, name);
- if (field)
- return field;
- field = __find_event_field(&ftrace_generic_fields, name);
- if (field)
- return field;
- return __find_event_field(&ftrace_common_fields, 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 trace_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 __generic_field(type, item, filter_type) \
- ret = __trace_define_field(&ftrace_generic_fields, #type, \
- #item, 0, 0, is_signed_type(type), \
- filter_type); \
- if (ret) \
- return ret;
- #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_generic_fields(void)
- {
- int ret;
- __generic_field(int, CPU, FILTER_CPU);
- __generic_field(int, cpu, FILTER_CPU);
- __generic_field(char *, COMM, FILTER_COMM);
- __generic_field(char *, comm, FILTER_COMM);
- 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 trace_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 trace_event_call *call)
- {
- int id;
- id = register_trace_event(&call->event);
- if (!id)
- return -ENODEV;
- return 0;
- }
- EXPORT_SYMBOL_GPL(trace_event_raw_init);
- bool trace_event_ignore_this_pid(struct trace_event_file *trace_file)
- {
- struct trace_array *tr = trace_file->tr;
- struct trace_array_cpu *data;
- struct trace_pid_list *pid_list;
- pid_list = rcu_dereference_sched(tr->filtered_pids);
- if (!pid_list)
- return false;
- data = this_cpu_ptr(tr->trace_buffer.data);
- return data->ignore_pid;
- }
- EXPORT_SYMBOL_GPL(trace_event_ignore_this_pid);
- void *trace_event_buffer_reserve(struct trace_event_buffer *fbuffer,
- struct trace_event_file *trace_file,
- unsigned long len)
- {
- struct trace_event_call *event_call = trace_file->event_call;
- if ((trace_file->flags & EVENT_FILE_FL_PID_FILTER) &&
- trace_event_ignore_this_pid(trace_file))
- return NULL;
- local_save_flags(fbuffer->flags);
- fbuffer->pc = preempt_count();
- fbuffer->trace_file = trace_file;
- fbuffer->event =
- trace_event_buffer_lock_reserve(&fbuffer->buffer, trace_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(trace_event_buffer_reserve);
- static DEFINE_SPINLOCK(tracepoint_iter_lock);
- static void output_printk(struct trace_event_buffer *fbuffer)
- {
- struct trace_event_call *event_call;
- struct trace_event *event;
- unsigned long flags;
- struct trace_iterator *iter = tracepoint_print_iter;
- if (!iter)
- return;
- event_call = fbuffer->trace_file->event_call;
- if (!event_call || !event_call->event.funcs ||
- !event_call->event.funcs->trace)
- return;
- event = &fbuffer->trace_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 trace_event_buffer_commit(struct trace_event_buffer *fbuffer)
- {
- if (tracepoint_printk)
- output_printk(fbuffer);
- event_trigger_unlock_commit(fbuffer->trace_file, fbuffer->buffer,
- fbuffer->event, fbuffer->entry,
- fbuffer->flags, fbuffer->pc);
- }
- EXPORT_SYMBOL_GPL(trace_event_buffer_commit);
- int trace_event_reg(struct trace_event_call *call,
- enum trace_reg type, void *data)
- {
- struct trace_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(trace_event_reg);
- void trace_event_enable_cmd_record(bool enable)
- {
- struct trace_event_file *file;
- struct trace_array *tr;
- mutex_lock(&event_mutex);
- do_for_each_event_file(tr, file) {
- if (!(file->flags & EVENT_FILE_FL_ENABLED))
- continue;
- if (enable) {
- tracing_start_cmdline_record();
- set_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags);
- } else {
- tracing_stop_cmdline_record();
- clear_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags);
- }
- } while_for_each_event_file();
- mutex_unlock(&event_mutex);
- }
- static int __ftrace_event_enable_disable(struct trace_event_file *file,
- int enable, int soft_disable)
- {
- struct trace_event_call *call = file->event_call;
- struct trace_array *tr = file->tr;
- 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 & EVENT_FILE_FL_SOFT_DISABLED;
- clear_bit(EVENT_FILE_FL_SOFT_MODE_BIT, &file->flags);
- } else
- disable = !(file->flags & EVENT_FILE_FL_SOFT_MODE);
- if (disable && (file->flags & EVENT_FILE_FL_ENABLED)) {
- clear_bit(EVENT_FILE_FL_ENABLED_BIT, &file->flags);
- if (file->flags & EVENT_FILE_FL_RECORDED_CMD) {
- tracing_stop_cmdline_record();
- clear_bit(EVENT_FILE_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 & EVENT_FILE_FL_SOFT_MODE)
- set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags);
- else
- clear_bit(EVENT_FILE_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(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags);
- else {
- if (atomic_inc_return(&file->sm_ref) > 1)
- break;
- set_bit(EVENT_FILE_FL_SOFT_MODE_BIT, &file->flags);
- }
- if (!(file->flags & EVENT_FILE_FL_ENABLED)) {
- /* Keep the event disabled, when going to SOFT_MODE. */
- if (soft_disable)
- set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags);
- if (tr->trace_flags & TRACE_ITER_RECORD_CMD) {
- tracing_start_cmdline_record();
- set_bit(EVENT_FILE_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", trace_event_name(call));
- break;
- }
- set_bit(EVENT_FILE_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 trace_event_file *file,
- int enable, int soft_disable)
- {
- return __ftrace_event_enable_disable(file, enable, soft_disable);
- }
- static int ftrace_event_enable_disable(struct trace_event_file *file,
- int enable)
- {
- return __ftrace_event_enable_disable(file, enable, 0);
- }
- static void ftrace_clear_events(struct trace_array *tr)
- {
- struct trace_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 int cmp_pid(const void *key, const void *elt)
- {
- const pid_t *search_pid = key;
- const pid_t *pid = elt;
- if (*search_pid == *pid)
- return 0;
- if (*search_pid < *pid)
- return -1;
- return 1;
- }
- static bool
- check_ignore_pid(struct trace_pid_list *filtered_pids, struct task_struct *task)
- {
- pid_t search_pid;
- pid_t *pid;
- /*
- * Return false, because if filtered_pids does not exist,
- * all pids are good to trace.
- */
- if (!filtered_pids)
- return false;
- search_pid = task->pid;
- pid = bsearch(&search_pid, filtered_pids->pids,
- filtered_pids->nr_pids, sizeof(pid_t),
- cmp_pid);
- if (!pid)
- return true;
- return false;
- }
- static void
- event_filter_pid_sched_switch_probe_pre(void *data, bool preempt,
- struct task_struct *prev, struct task_struct *next)
- {
- struct trace_array *tr = data;
- struct trace_pid_list *pid_list;
- pid_list = rcu_dereference_sched(tr->filtered_pids);
- this_cpu_write(tr->trace_buffer.data->ignore_pid,
- check_ignore_pid(pid_list, prev) &&
- check_ignore_pid(pid_list, next));
- }
- static void
- event_filter_pid_sched_switch_probe_post(void *data, bool preempt,
- struct task_struct *prev, struct task_struct *next)
- {
- struct trace_array *tr = data;
- struct trace_pid_list *pid_list;
- pid_list = rcu_dereference_sched(tr->filtered_pids);
- this_cpu_write(tr->trace_buffer.data->ignore_pid,
- check_ignore_pid(pid_list, next));
- }
- static void
- event_filter_pid_sched_wakeup_probe_pre(void *data, struct task_struct *task)
- {
- struct trace_array *tr = data;
- struct trace_pid_list *pid_list;
- /* Nothing to do if we are already tracing */
- if (!this_cpu_read(tr->trace_buffer.data->ignore_pid))
- return;
- pid_list = rcu_dereference_sched(tr->filtered_pids);
- this_cpu_write(tr->trace_buffer.data->ignore_pid,
- check_ignore_pid(pid_list, task));
- }
- static void
- event_filter_pid_sched_wakeup_probe_post(void *data, struct task_struct *task)
- {
- struct trace_array *tr = data;
- struct trace_pid_list *pid_list;
- /* Nothing to do if we are not tracing */
- if (this_cpu_read(tr->trace_buffer.data->ignore_pid))
- return;
- pid_list = rcu_dereference_sched(tr->filtered_pids);
- /* Set tracing if current is enabled */
- this_cpu_write(tr->trace_buffer.data->ignore_pid,
- check_ignore_pid(pid_list, current));
- }
- static void __ftrace_clear_event_pids(struct trace_array *tr)
- {
- struct trace_pid_list *pid_list;
- struct trace_event_file *file;
- int cpu;
- pid_list = rcu_dereference_protected(tr->filtered_pids,
- lockdep_is_held(&event_mutex));
- if (!pid_list)
- return;
- unregister_trace_sched_switch(event_filter_pid_sched_switch_probe_pre, tr);
- unregister_trace_sched_switch(event_filter_pid_sched_switch_probe_post, tr);
- unregister_trace_sched_wakeup(event_filter_pid_sched_wakeup_probe_pre, tr);
- unregister_trace_sched_wakeup(event_filter_pid_sched_wakeup_probe_post, tr);
- unregister_trace_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_pre, tr);
- unregister_trace_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_post, tr);
- unregister_trace_sched_waking(event_filter_pid_sched_wakeup_probe_pre, tr);
- unregister_trace_sched_waking(event_filter_pid_sched_wakeup_probe_post, tr);
- list_for_each_entry(file, &tr->events, list) {
- clear_bit(EVENT_FILE_FL_PID_FILTER_BIT, &file->flags);
- }
- for_each_possible_cpu(cpu)
- per_cpu_ptr(tr->trace_buffer.data, cpu)->ignore_pid = false;
- rcu_assign_pointer(tr->filtered_pids, NULL);
- /* Wait till all users are no longer using pid filtering */
- synchronize_sched();
- free_pages((unsigned long)pid_list->pids, pid_list->order);
- kfree(pid_list);
- }
- static void ftrace_clear_event_pids(struct trace_array *tr)
- {
- mutex_lock(&event_mutex);
- __ftrace_clear_event_pids(tr);
- 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);
- }
- kfree_const(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 trace_subsystem_dir *dir)
- {
- WARN_ON_ONCE(dir->ref_count == 0);
- dir->ref_count++;
- __get_system(dir->subsystem);
- }
- static void __put_system_dir(struct trace_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 trace_subsystem_dir *dir)
- {
- mutex_lock(&event_mutex);
- __put_system_dir(dir);
- mutex_unlock(&event_mutex);
- }
- static void remove_subsystem(struct trace_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 trace_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 trace_event_file *file;
- struct trace_event_call *call;
- const char *name;
- int ret = -EINVAL;
- list_for_each_entry(file, &tr->events, list) {
- call = file->event_call;
- name = trace_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 trace_event_file *file = v;
- struct trace_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 &&
- !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE))
- return file;
- }
- return NULL;
- }
- static void *t_start(struct seq_file *m, loff_t *pos)
- {
- struct trace_event_file *file;
- struct trace_array *tr = m->private;
- loff_t l;
- mutex_lock(&event_mutex);
- file = list_entry(&tr->events, struct trace_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 trace_event_file *file = v;
- struct trace_array *tr = m->private;
- (*pos)++;
- list_for_each_entry_continue(file, &tr->events, list) {
- if (file->flags & EVENT_FILE_FL_ENABLED)
- return file;
- }
- return NULL;
- }
- static void *s_start(struct seq_file *m, loff_t *pos)
- {
- struct trace_event_file *file;
- struct trace_array *tr = m->private;
- loff_t l;
- mutex_lock(&event_mutex);
- file = list_entry(&tr->events, struct trace_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 trace_event_file *file = v;
- struct trace_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", trace_event_name(call));
- return 0;
- }
- static void t_stop(struct seq_file *m, void *p)
- {
- mutex_unlock(&event_mutex);
- }
- static void *p_start(struct seq_file *m, loff_t *pos)
- __acquires(RCU)
- {
- struct trace_pid_list *pid_list;
- struct trace_array *tr = m->private;
- /*
- * Grab the mutex, to keep calls to p_next() having the same
- * tr->filtered_pids as p_start() has.
- * If we just passed the tr->filtered_pids around, then RCU would
- * have been enough, but doing that makes things more complex.
- */
- mutex_lock(&event_mutex);
- rcu_read_lock_sched();
- pid_list = rcu_dereference_sched(tr->filtered_pids);
- if (!pid_list || *pos >= pid_list->nr_pids)
- return NULL;
- return (void *)&pid_list->pids[*pos];
- }
- static void p_stop(struct seq_file *m, void *p)
- __releases(RCU)
- {
- rcu_read_unlock_sched();
- mutex_unlock(&event_mutex);
- }
- static void *
- p_next(struct seq_file *m, void *v, loff_t *pos)
- {
- struct trace_array *tr = m->private;
- struct trace_pid_list *pid_list = rcu_dereference_sched(tr->filtered_pids);
- (*pos)++;
- if (*pos >= pid_list->nr_pids)
- return NULL;
- return (void *)&pid_list->pids[*pos];
- }
- static int p_show(struct seq_file *m, void *v)
- {
- pid_t *pid = v;
- seq_printf(m, "%d\n", *pid);
- return 0;
- }
- static ssize_t
- event_enable_read(struct file *filp, char __user *ubuf, size_t cnt,
- loff_t *ppos)
- {
- struct trace_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 & EVENT_FILE_FL_ENABLED &&
- !(flags & EVENT_FILE_FL_SOFT_DISABLED))
- strcpy(buf, "1");
- if (flags & EVENT_FILE_FL_SOFT_DISABLED ||
- flags & EVENT_FILE_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 trace_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 trace_subsystem_dir *dir = filp->private_data;
- struct event_subsystem *system = dir->subsystem;
- struct trace_event_call *call;
- struct trace_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 (!trace_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 & EVENT_FILE_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 trace_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 trace_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 trace_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", trace_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 trace_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 trace_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 trace_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 trace_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 trace_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 trace_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 trace_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 max_pids(struct trace_pid_list *pid_list)
- {
- return (PAGE_SIZE << pid_list->order) / sizeof(pid_t);
- }
- static void ignore_task_cpu(void *data)
- {
- struct trace_array *tr = data;
- struct trace_pid_list *pid_list;
- /*
- * This function is called by on_each_cpu() while the
- * event_mutex is held.
- */
- pid_list = rcu_dereference_protected(tr->filtered_pids,
- mutex_is_locked(&event_mutex));
- this_cpu_write(tr->trace_buffer.data->ignore_pid,
- check_ignore_pid(pid_list, current));
- }
- static ssize_t
- ftrace_event_pid_write(struct file *filp, const char __user *ubuf,
- size_t cnt, loff_t *ppos)
- {
- struct seq_file *m = filp->private_data;
- struct trace_array *tr = m->private;
- struct trace_pid_list *filtered_pids = NULL;
- struct trace_pid_list *pid_list = NULL;
- struct trace_event_file *file;
- struct trace_parser parser;
- unsigned long val;
- loff_t this_pos;
- ssize_t read = 0;
- ssize_t ret = 0;
- pid_t pid;
- int i;
- 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;
- mutex_lock(&event_mutex);
- /*
- * Load as many pids into the array before doing a
- * swap from the tr->filtered_pids to the new list.
- */
- while (cnt > 0) {
- this_pos = 0;
- ret = trace_get_user(&parser, ubuf, cnt, &this_pos);
- if (ret < 0 || !trace_parser_loaded(&parser))
- break;
- read += ret;
- ubuf += ret;
- cnt -= ret;
- parser.buffer[parser.idx] = 0;
- ret = -EINVAL;
- if (kstrtoul(parser.buffer, 0, &val))
- break;
- if (val > INT_MAX)
- break;
- pid = (pid_t)val;
- ret = -ENOMEM;
- if (!pid_list) {
- pid_list = kmalloc(sizeof(*pid_list), GFP_KERNEL);
- if (!pid_list)
- break;
- filtered_pids = rcu_dereference_protected(tr->filtered_pids,
- lockdep_is_held(&event_mutex));
- if (filtered_pids)
- pid_list->order = filtered_pids->order;
- else
- pid_list->order = 0;
- pid_list->pids = (void *)__get_free_pages(GFP_KERNEL,
- pid_list->order);
- if (!pid_list->pids)
- break;
- if (filtered_pids) {
- pid_list->nr_pids = filtered_pids->nr_pids;
- memcpy(pid_list->pids, filtered_pids->pids,
- pid_list->nr_pids * sizeof(pid_t));
- } else
- pid_list->nr_pids = 0;
- }
- if (pid_list->nr_pids >= max_pids(pid_list)) {
- pid_t *pid_page;
- pid_page = (void *)__get_free_pages(GFP_KERNEL,
- pid_list->order + 1);
- if (!pid_page)
- break;
- memcpy(pid_page, pid_list->pids,
- pid_list->nr_pids * sizeof(pid_t));
- free_pages((unsigned long)pid_list->pids, pid_list->order);
- pid_list->order++;
- pid_list->pids = pid_page;
- }
- pid_list->pids[pid_list->nr_pids++] = pid;
- trace_parser_clear(&parser);
- ret = 0;
- }
- trace_parser_put(&parser);
- if (ret < 0) {
- if (pid_list)
- free_pages((unsigned long)pid_list->pids, pid_list->order);
- kfree(pid_list);
- mutex_unlock(&event_mutex);
- return ret;
- }
- if (!pid_list) {
- mutex_unlock(&event_mutex);
- return ret;
- }
- sort(pid_list->pids, pid_list->nr_pids, sizeof(pid_t), cmp_pid, NULL);
- /* Remove duplicates */
- for (i = 1; i < pid_list->nr_pids; i++) {
- int start = i;
- while (i < pid_list->nr_pids &&
- pid_list->pids[i - 1] == pid_list->pids[i])
- i++;
- if (start != i) {
- if (i < pid_list->nr_pids) {
- memmove(&pid_list->pids[start], &pid_list->pids[i],
- (pid_list->nr_pids - i) * sizeof(pid_t));
- pid_list->nr_pids -= i - start;
- i = start;
- } else
- pid_list->nr_pids = start;
- }
- }
- rcu_assign_pointer(tr->filtered_pids, pid_list);
- list_for_each_entry(file, &tr->events, list) {
- set_bit(EVENT_FILE_FL_PID_FILTER_BIT, &file->flags);
- }
- if (filtered_pids) {
- synchronize_sched();
- free_pages((unsigned long)filtered_pids->pids, filtered_pids->order);
- kfree(filtered_pids);
- } else {
- /*
- * Register a probe that is called before all other probes
- * to set ignore_pid if next or prev do not match.
- * Register a probe this is called after all other probes
- * to only keep ignore_pid set if next pid matches.
- */
- register_trace_prio_sched_switch(event_filter_pid_sched_switch_probe_pre,
- tr, INT_MAX);
- register_trace_prio_sched_switch(event_filter_pid_sched_switch_probe_post,
- tr, 0);
- register_trace_prio_sched_wakeup(event_filter_pid_sched_wakeup_probe_pre,
- tr, INT_MAX);
- register_trace_prio_sched_wakeup(event_filter_pid_sched_wakeup_probe_post,
- tr, 0);
- register_trace_prio_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_pre,
- tr, INT_MAX);
- register_trace_prio_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_post,
- tr, 0);
- register_trace_prio_sched_waking(event_filter_pid_sched_wakeup_probe_pre,
- tr, INT_MAX);
- register_trace_prio_sched_waking(event_filter_pid_sched_wakeup_probe_post,
- tr, 0);
- }
- /*
- * Ignoring of pids is done at task switch. But we have to
- * check for those tasks that are currently running.
- * Always do this in case a pid was appended or removed.
- */
- on_each_cpu(ignore_task_cpu, tr, 1);
- mutex_unlock(&event_mutex);
- ret = read;
- *ppos += read;
- return ret;
- }
- 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_set_pid_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 seq_operations show_set_pid_seq_ops = {
- .start = p_start,
- .next = p_next,
- .show = p_show,
- .stop = p_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_set_event_pid_fops = {
- .open = ftrace_event_set_pid_open,
- .read = seq_read,
- .write = ftrace_event_pid_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 int
- ftrace_event_set_pid_open(struct inode *inode, struct file *file)
- {
- const struct seq_operations *seq_ops = &show_set_pid_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_event_pids(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) */
- system->name = kstrdup_const(name, GFP_KERNEL);
- if (!system->name)
- goto out_free;
- 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:
- kfree_const(system->name);
- kfree(system);
- return NULL;
- }
- static struct dentry *
- event_subsystem_dir(struct trace_array *tr, const char *name,
- struct trace_event_file *file, struct dentry *parent)
- {
- struct trace_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 trace_event_file *file)
- {
- struct trace_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 = trace_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);
- /*
- * Only event directories that can be enabled should have
- * triggers.
- */
- if (!(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE))
- 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 trace_event_call *call)
- {
- struct trace_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 trace_event_call *call)
- {
- struct trace_array *tr;
- struct trace_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_trace_event(&call->event);
- remove_event_from_tracers(call);
- list_del(&call->list);
- }
- static int event_init(struct trace_event_call *call)
- {
- int ret = 0;
- const char *name;
- name = trace_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 trace_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 trace_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 trace_event_call *call, *p;
- const char *last_system = NULL;
- bool first = false;
- 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) {
- first = true;
- last_i = 0;
- last_system = call->class->system;
- }
- /*
- * Since calls are grouped by systems, the likelyhood that the
- * next call in the iteration belongs to the same system as the
- * previous call is high. As an optimization, we skip seaching
- * for a map[] that matches the call's system if the last call
- * was from the same system. That's what last_i is for. If the
- * call has the same system as the previous call, then last_i
- * will be the index of the first map[] that has a matching
- * system.
- */
- for (i = last_i; i < len; i++) {
- if (call->class->system == map[i]->system) {
- /* Save the first system if need be */
- if (first) {
- last_i = i;
- first = false;
- }
- update_event_printk(call, map[i]);
- }
- }
- }
- up_write(&trace_event_sem);
- }
- static struct trace_event_file *
- trace_create_new_event(struct trace_event_call *call,
- struct trace_array *tr)
- {
- struct trace_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 trace_event_call *call, struct trace_array *tr)
- {
- struct trace_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 trace_event_call *call,
- struct trace_array *tr)
- {
- struct trace_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 trace_event_call *call);
- /* Add an additional event_call dynamically */
- int trace_add_event_call(struct trace_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 trace_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 trace_event_call *call)
- {
- struct trace_array *tr;
- struct trace_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, EVENT_FILE_FL_SOFT_MODE can suppress
- * TRACE_REG_UNREGISTER.
- */
- if (file->flags & EVENT_FILE_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 trace_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 trace_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 trace_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 trace_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",
- trace_event_name(call));
- }
- }
- struct trace_event_file *
- find_event_file(struct trace_array *tr, const char *system, const char *event)
- {
- struct trace_event_file *file;
- struct trace_event_call *call;
- const char *name;
- list_for_each_entry(file, &tr->events, list) {
- call = file->event_call;
- name = trace_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 trace_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(EVENT_FILE_FL_SOFT_DISABLED_BIT, &data->file->flags);
- else
- set_bit(EVENT_FILE_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 & EVENT_FILE_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,
- trace_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 trace_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 trace_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 trace_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",
- trace_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 trace_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",
- trace_event_name(call));
- }
- }
- /* Remove the event directory structure for a trace directory. */
- static void
- __trace_remove_event_dirs(struct trace_array *tr)
- {
- struct trace_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 trace_event_call *call)
- {
- struct trace_array *tr;
- list_for_each_entry(tr, &ftrace_trace_arrays, list)
- __trace_add_new_event(call, tr);
- }
- extern struct trace_event_call *__start_ftrace_events[];
- extern struct trace_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;
- }
- entry = tracefs_create_file("set_event_pid", 0644, parent,
- tr, &ftrace_set_event_pid_fops);
- /* 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);
- /* Clear the pid list */
- __ftrace_clear_event_pids(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(trace_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) {
- /* 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 trace_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_generic_fields())
- pr_warn("tracing: Failed to allocated generic fields");
- 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 trace_subsystem_dir *dir;
- struct trace_event_file *file;
- struct trace_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: ", trace_event_name(call));
- /*
- * If an event is already enabled, someone is using
- * it and the self test should not be on.
- */
- if (file->flags & EVENT_FILE_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 struct trace_array *event_tr;
- static void __init
- 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(event_tr, 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;
- event_tr = top_trace_array();
- if (WARN_ON(!event_tr))
- return;
- 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
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