| /* |
| * 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; |
| 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 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 |