#include <linux/uaccess.h>
#include <linux/module.h>
#include <linux/ctype.h>
+#include <linux/slab.h>
#include <linux/delay.h>
#include <asm/setup.h>
DEFINE_MUTEX(event_mutex);
+DEFINE_MUTEX(event_storage_mutex);
+EXPORT_SYMBOL_GPL(event_storage_mutex);
+
+char event_storage[EVENT_STORAGE_SIZE];
+EXPORT_SYMBOL_GPL(event_storage);
+
LIST_HEAD(ftrace_events);
+static LIST_HEAD(ftrace_common_fields);
-int trace_define_field(struct ftrace_event_call *call, const char *type,
- const char *name, int offset, int size, int is_signed,
- int filter_type)
+#define GFP_TRACE (GFP_KERNEL | __GFP_ZERO)
+
+static struct kmem_cache *field_cachep;
+static struct kmem_cache *file_cachep;
+
+#define SYSTEM_FL_FREE_NAME (1 << 31)
+
+static inline int system_refcount(struct event_subsystem *system)
+{
+ return system->ref_count & ~SYSTEM_FL_FREE_NAME;
+}
+
+static int system_refcount_inc(struct event_subsystem *system)
+{
+ return (system->ref_count++) & ~SYSTEM_FL_FREE_NAME;
+}
+
+static int system_refcount_dec(struct event_subsystem *system)
+{
+ return (--system->ref_count) & ~SYSTEM_FL_FREE_NAME;
+}
+
+/* Double loops, do not use break, only goto's work */
+#define do_for_each_event_file(tr, file) \
+ list_for_each_entry(tr, &ftrace_trace_arrays, list) { \
+ list_for_each_entry(file, &tr->events, list)
+
+#define do_for_each_event_file_safe(tr, file) \
+ list_for_each_entry(tr, &ftrace_trace_arrays, list) { \
+ struct ftrace_event_file *___n; \
+ list_for_each_entry_safe(file, ___n, &tr->events, list)
+
+#define while_for_each_event_file() \
+ }
+
+static struct list_head *
+trace_get_fields(struct ftrace_event_call *event_call)
+{
+ if (!event_call->class->get_fields)
+ return &event_call->class->fields;
+ return event_call->class->get_fields(event_call);
+}
+
+static struct ftrace_event_field *
+__find_event_field(struct list_head *head, char *name)
{
struct ftrace_event_field *field;
- field = kzalloc(sizeof(*field), GFP_KERNEL);
- if (!field)
- goto err;
+ list_for_each_entry(field, head, link) {
+ if (!strcmp(field->name, name))
+ return field;
+ }
+
+ return NULL;
+}
+
+struct ftrace_event_field *
+trace_find_event_field(struct ftrace_event_call *call, char *name)
+{
+ struct ftrace_event_field *field;
+ struct list_head *head;
+
+ field = __find_event_field(&ftrace_common_fields, name);
+ if (field)
+ return field;
- field->name = kstrdup(name, GFP_KERNEL);
- if (!field->name)
- goto err;
+ head = trace_get_fields(call);
+ return __find_event_field(head, name);
+}
+
+static int __trace_define_field(struct list_head *head, const char *type,
+ const char *name, int offset, int size,
+ int is_signed, int filter_type)
+{
+ struct ftrace_event_field *field;
- field->type = kstrdup(type, GFP_KERNEL);
- if (!field->type)
- goto err;
+ 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);
field->size = size;
field->is_signed = is_signed;
- list_add(&field->link, &call->fields);
+ list_add(&field->link, head);
return 0;
+}
-err:
- if (field) {
- kfree(field->name);
- kfree(field->type);
- }
- kfree(field);
+int trace_define_field(struct ftrace_event_call *call, const char *type,
+ const char *name, int offset, int size, int is_signed,
+ int filter_type)
+{
+ struct list_head *head;
+
+ if (WARN_ON(!call->class))
+ return 0;
- return -ENOMEM;
+ head = trace_get_fields(call);
+ return __trace_define_field(head, type, name, offset, size,
+ is_signed, filter_type);
}
EXPORT_SYMBOL_GPL(trace_define_field);
#define __common_field(type, item) \
- ret = trace_define_field(call, #type, "common_" #item, \
- offsetof(typeof(ent), item), \
- sizeof(ent.item), \
- is_signed_type(type), FILTER_OTHER); \
+ 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;
-int trace_define_common_fields(struct ftrace_event_call *call)
+static int trace_define_common_fields(void)
{
int ret;
struct trace_entry ent;
__common_field(unsigned char, flags);
__common_field(unsigned char, preempt_count);
__common_field(int, pid);
- __common_field(int, lock_depth);
return ret;
}
-EXPORT_SYMBOL_GPL(trace_define_common_fields);
-
-#ifdef CONFIG_MODULES
static void trace_destroy_fields(struct ftrace_event_call *call)
{
struct ftrace_event_field *field, *next;
+ struct list_head *head;
- list_for_each_entry_safe(field, next, &call->fields, link) {
+ head = trace_get_fields(call);
+ list_for_each_entry_safe(field, next, head, link) {
list_del(&field->link);
- kfree(field->type);
- kfree(field->name);
- kfree(field);
+ kmem_cache_free(field_cachep, field);
}
}
-#endif /* CONFIG_MODULES */
+int trace_event_raw_init(struct ftrace_event_call *call)
+{
+ int id;
+
+ id = register_ftrace_event(&call->event);
+ if (!id)
+ return -ENODEV;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(trace_event_raw_init);
+
+int ftrace_event_reg(struct ftrace_event_call *call,
+ enum trace_reg type, void *data)
+{
+ struct ftrace_event_file *file = data;
+
+ switch (type) {
+ case TRACE_REG_REGISTER:
+ return tracepoint_probe_register(call->name,
+ call->class->probe,
+ file);
+ case TRACE_REG_UNREGISTER:
+ tracepoint_probe_unregister(call->name,
+ call->class->probe,
+ file);
+ return 0;
+
+#ifdef CONFIG_PERF_EVENTS
+ case TRACE_REG_PERF_REGISTER:
+ return tracepoint_probe_register(call->name,
+ call->class->perf_probe,
+ call);
+ case TRACE_REG_PERF_UNREGISTER:
+ tracepoint_probe_unregister(call->name,
+ call->class->perf_probe,
+ call);
+ return 0;
+ case TRACE_REG_PERF_OPEN:
+ case TRACE_REG_PERF_CLOSE:
+ case TRACE_REG_PERF_ADD:
+ case TRACE_REG_PERF_DEL:
+ return 0;
+#endif
+ }
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ftrace_event_reg);
+
+void trace_event_enable_cmd_record(bool enable)
+{
+ struct ftrace_event_file *file;
+ struct trace_array *tr;
+
+ mutex_lock(&event_mutex);
+ do_for_each_event_file(tr, file) {
+
+ if (!(file->flags & FTRACE_EVENT_FL_ENABLED))
+ continue;
+
+ if (enable) {
+ tracing_start_cmdline_record();
+ set_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags);
+ } else {
+ tracing_stop_cmdline_record();
+ clear_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags);
+ }
+ } while_for_each_event_file();
+ mutex_unlock(&event_mutex);
+}
-static void ftrace_event_enable_disable(struct ftrace_event_call *call,
- int enable)
+static int __ftrace_event_enable_disable(struct ftrace_event_file *file,
+ int enable, int soft_disable)
{
+ struct ftrace_event_call *call = file->event_call;
+ int ret = 0;
+ int disable;
+
switch (enable) {
case 0:
- if (call->enabled) {
- call->enabled = 0;
- tracing_stop_cmdline_record();
- call->unregfunc(call->data);
+ /*
+ * When soft_disable is set and enable is cleared, the sm_ref
+ * reference counter is decremented. If it reaches 0, we want
+ * to clear the SOFT_DISABLED flag but leave the event in the
+ * state that it was. That is, if the event was enabled and
+ * SOFT_DISABLED isn't set, then do nothing. But if SOFT_DISABLED
+ * is set we do not want the event to be enabled before we
+ * clear the bit.
+ *
+ * When soft_disable is not set but the SOFT_MODE flag is,
+ * we do nothing. Do not disable the tracepoint, otherwise
+ * "soft enable"s (clearing the SOFT_DISABLED bit) wont work.
+ */
+ if (soft_disable) {
+ if (atomic_dec_return(&file->sm_ref) > 0)
+ break;
+ disable = file->flags & FTRACE_EVENT_FL_SOFT_DISABLED;
+ clear_bit(FTRACE_EVENT_FL_SOFT_MODE_BIT, &file->flags);
+ } else
+ disable = !(file->flags & FTRACE_EVENT_FL_SOFT_MODE);
+
+ if (disable && (file->flags & FTRACE_EVENT_FL_ENABLED)) {
+ clear_bit(FTRACE_EVENT_FL_ENABLED_BIT, &file->flags);
+ if (file->flags & FTRACE_EVENT_FL_RECORDED_CMD) {
+ tracing_stop_cmdline_record();
+ clear_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags);
+ }
+ call->class->reg(call, TRACE_REG_UNREGISTER, file);
}
+ /* If in SOFT_MODE, just set the SOFT_DISABLE_BIT */
+ if (file->flags & FTRACE_EVENT_FL_SOFT_MODE)
+ set_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags);
break;
case 1:
- if (!call->enabled) {
- call->enabled = 1;
- tracing_start_cmdline_record();
- call->regfunc(call->data);
+ /*
+ * When soft_disable is set and enable is set, we want to
+ * register the tracepoint for the event, but leave the event
+ * as is. That means, if the event was already enabled, we do
+ * nothing (but set SOFT_MODE). If the event is disabled, we
+ * set SOFT_DISABLED before enabling the event tracepoint, so
+ * it still seems to be disabled.
+ */
+ if (!soft_disable)
+ clear_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags);
+ else {
+ if (atomic_inc_return(&file->sm_ref) > 1)
+ break;
+ set_bit(FTRACE_EVENT_FL_SOFT_MODE_BIT, &file->flags);
+ }
+
+ if (!(file->flags & FTRACE_EVENT_FL_ENABLED)) {
+
+ /* Keep the event disabled, when going to SOFT_MODE. */
+ if (soft_disable)
+ set_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags);
+
+ if (trace_flags & TRACE_ITER_RECORD_CMD) {
+ tracing_start_cmdline_record();
+ set_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags);
+ }
+ ret = call->class->reg(call, TRACE_REG_REGISTER, file);
+ if (ret) {
+ tracing_stop_cmdline_record();
+ pr_info("event trace: Could not enable event "
+ "%s\n", call->name);
+ break;
+ }
+ set_bit(FTRACE_EVENT_FL_ENABLED_BIT, &file->flags);
+
+ /* WAS_ENABLED gets set but never cleared. */
+ call->flags |= TRACE_EVENT_FL_WAS_ENABLED;
}
break;
}
+
+ return ret;
}
-static void ftrace_clear_events(void)
+static int ftrace_event_enable_disable(struct ftrace_event_file *file,
+ int enable)
{
- struct ftrace_event_call *call;
+ return __ftrace_event_enable_disable(file, enable, 0);
+}
+
+static void ftrace_clear_events(struct trace_array *tr)
+{
+ struct ftrace_event_file *file;
mutex_lock(&event_mutex);
- list_for_each_entry(call, &ftrace_events, list) {
- ftrace_event_enable_disable(call, 0);
+ list_for_each_entry(file, &tr->events, list) {
+ ftrace_event_enable_disable(file, 0);
+ }
+ mutex_unlock(&event_mutex);
+}
+
+static void __put_system(struct event_subsystem *system)
+{
+ struct event_filter *filter = system->filter;
+
+ WARN_ON_ONCE(system_refcount(system) == 0);
+ if (system_refcount_dec(system))
+ return;
+
+ list_del(&system->list);
+
+ if (filter) {
+ kfree(filter->filter_string);
+ kfree(filter);
}
+ if (system->ref_count & SYSTEM_FL_FREE_NAME)
+ kfree(system->name);
+ kfree(system);
+}
+
+static void __get_system(struct event_subsystem *system)
+{
+ WARN_ON_ONCE(system_refcount(system) == 0);
+ system_refcount_inc(system);
+}
+
+static void __get_system_dir(struct ftrace_subsystem_dir *dir)
+{
+ WARN_ON_ONCE(dir->ref_count == 0);
+ dir->ref_count++;
+ __get_system(dir->subsystem);
+}
+
+static void __put_system_dir(struct ftrace_subsystem_dir *dir)
+{
+ WARN_ON_ONCE(dir->ref_count == 0);
+ /* If the subsystem is about to be freed, the dir must be too */
+ WARN_ON_ONCE(system_refcount(dir->subsystem) == 1 && dir->ref_count != 1);
+
+ __put_system(dir->subsystem);
+ if (!--dir->ref_count)
+ kfree(dir);
+}
+
+static void put_system(struct ftrace_subsystem_dir *dir)
+{
+ mutex_lock(&event_mutex);
+ __put_system_dir(dir);
mutex_unlock(&event_mutex);
}
+static void remove_subsystem(struct ftrace_subsystem_dir *dir)
+{
+ if (!dir)
+ return;
+
+ if (!--dir->nr_events) {
+ debugfs_remove_recursive(dir->entry);
+ list_del(&dir->list);
+ __put_system_dir(dir);
+ }
+}
+
+static void *event_file_data(struct file *filp)
+{
+ return ACCESS_ONCE(file_inode(filp)->i_private);
+}
+
+static void remove_event_file_dir(struct ftrace_event_file *file)
+{
+ struct dentry *dir = file->dir;
+ struct dentry *child;
+
+ if (dir) {
+ spin_lock(&dir->d_lock); /* probably unneeded */
+ list_for_each_entry(child, &dir->d_subdirs, d_u.d_child) {
+ if (child->d_inode) /* probably unneeded */
+ child->d_inode->i_private = NULL;
+ }
+ spin_unlock(&dir->d_lock);
+
+ debugfs_remove_recursive(dir);
+ }
+
+ list_del(&file->list);
+ remove_subsystem(file->system);
+ 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(const char *match, const char *sub,
- const char *event, int set)
+static int
+__ftrace_set_clr_event_nolock(struct trace_array *tr, const char *match,
+ const char *sub, const char *event, int set)
{
+ struct ftrace_event_file *file;
struct ftrace_event_call *call;
int ret = -EINVAL;
- mutex_lock(&event_mutex);
- list_for_each_entry(call, &ftrace_events, list) {
+ list_for_each_entry(file, &tr->events, list) {
+
+ call = file->event_call;
+
+ if (!call->name || !call->class || !call->class->reg)
+ continue;
- if (!call->name || !call->regfunc)
+ if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)
continue;
if (match &&
strcmp(match, call->name) != 0 &&
- strcmp(match, call->system) != 0)
+ strcmp(match, call->class->system) != 0)
continue;
- if (sub && strcmp(sub, call->system) != 0)
+ if (sub && strcmp(sub, call->class->system) != 0)
continue;
if (event && strcmp(event, call->name) != 0)
continue;
- ftrace_event_enable_disable(call, set);
+ 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(char *buf, int set)
+static int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set)
{
char *event = NULL, *sub = NULL, *match;
event = NULL;
}
- return __ftrace_set_clr_event(match, sub, event, set);
+ return __ftrace_set_clr_event(tr, match, sub, event, set);
}
/**
*/
int trace_set_clr_event(const char *system, const char *event, int set)
{
- return __ftrace_set_clr_event(NULL, system, event, set);
+ struct trace_array *tr = top_trace_array();
+
+ 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
size_t cnt, loff_t *ppos)
{
struct trace_parser parser;
- size_t read = 0;
- ssize_t ret;
+ struct seq_file *m = file->private_data;
+ struct trace_array *tr = m->private;
+ ssize_t read, ret;
- if (!cnt || cnt < 0)
+ if (!cnt)
return 0;
ret = tracing_update_buffers();
read = trace_get_user(&parser, ubuf, cnt, ppos);
- if (trace_parser_loaded((&parser))) {
+ if (read >= 0 && trace_parser_loaded((&parser))) {
int set = 1;
if (*parser.buffer == '!')
parser.buffer[parser.idx] = 0;
- ret = ftrace_set_clr_event(parser.buffer + !set, set);
+ ret = ftrace_set_clr_event(tr, parser.buffer + !set, set);
if (ret)
goto out_put;
}
static void *
t_next(struct seq_file *m, void *v, loff_t *pos)
{
- struct list_head *list = m->private;
+ struct ftrace_event_file *file = v;
struct ftrace_event_call *call;
+ struct trace_array *tr = m->private;
(*pos)++;
- for (;;) {
- if (list == &ftrace_events)
- return NULL;
-
- call = list_entry(list, struct ftrace_event_call, list);
-
+ 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->regfunc)
- break;
-
- list = list->next;
+ if (call->class && call->class->reg)
+ return file;
}
- m->private = list->next;
-
- return call;
+ return NULL;
}
static void *t_start(struct seq_file *m, loff_t *pos)
{
- struct ftrace_event_call *call = NULL;
+ struct ftrace_event_file *file;
+ struct trace_array *tr = m->private;
loff_t l;
mutex_lock(&event_mutex);
- m->private = ftrace_events.next;
+ file = list_entry(&tr->events, struct ftrace_event_file, list);
for (l = 0; l <= *pos; ) {
- call = t_next(m, NULL, &l);
- if (!call)
+ file = t_next(m, file, &l);
+ if (!file)
break;
}
- return call;
+ return file;
}
static void *
s_next(struct seq_file *m, void *v, loff_t *pos)
{
- struct list_head *list = m->private;
- struct ftrace_event_call *call;
+ struct ftrace_event_file *file = v;
+ struct trace_array *tr = m->private;
(*pos)++;
- retry:
- if (list == &ftrace_events)
- return NULL;
-
- call = list_entry(list, struct ftrace_event_call, list);
-
- if (!call->enabled) {
- list = list->next;
- goto retry;
+ list_for_each_entry_continue(file, &tr->events, list) {
+ if (file->flags & FTRACE_EVENT_FL_ENABLED)
+ return file;
}
- m->private = list->next;
-
- return call;
+ return NULL;
}
static void *s_start(struct seq_file *m, loff_t *pos)
{
- struct ftrace_event_call *call = NULL;
+ struct ftrace_event_file *file;
+ struct trace_array *tr = m->private;
loff_t l;
mutex_lock(&event_mutex);
- m->private = ftrace_events.next;
+ file = list_entry(&tr->events, struct ftrace_event_file, list);
for (l = 0; l <= *pos; ) {
- call = s_next(m, NULL, &l);
- if (!call)
+ file = s_next(m, file, &l);
+ if (!file)
break;
}
- return call;
+ return file;
}
static int t_show(struct seq_file *m, void *v)
{
- struct ftrace_event_call *call = v;
+ struct ftrace_event_file *file = v;
+ struct ftrace_event_call *call = file->event_call;
- if (strcmp(call->system, TRACE_SYSTEM) != 0)
- seq_printf(m, "%s:", call->system);
+ if (strcmp(call->class->system, TRACE_SYSTEM) != 0)
+ seq_printf(m, "%s:", call->class->system);
seq_printf(m, "%s\n", call->name);
return 0;
mutex_unlock(&event_mutex);
}
-static int
-ftrace_event_seq_open(struct inode *inode, struct file *file)
-{
- const struct seq_operations *seq_ops;
-
- if ((file->f_mode & FMODE_WRITE) &&
- (file->f_flags & O_TRUNC))
- ftrace_clear_events();
-
- seq_ops = inode->i_private;
- return seq_open(file, seq_ops);
-}
-
static ssize_t
event_enable_read(struct file *filp, char __user *ubuf, size_t cnt,
loff_t *ppos)
{
- struct ftrace_event_call *call = filp->private_data;
+ struct ftrace_event_file *file;
+ unsigned long flags;
char *buf;
- if (call->enabled)
- buf = "1\n";
- else
+ mutex_lock(&event_mutex);
+ file = event_file_data(filp);
+ if (likely(file))
+ flags = file->flags;
+ mutex_unlock(&event_mutex);
+
+ if (!file)
+ return -ENODEV;
+
+ if (flags & FTRACE_EVENT_FL_ENABLED) {
+ if (flags & FTRACE_EVENT_FL_SOFT_DISABLED)
+ buf = "0*\n";
+ else if (flags & FTRACE_EVENT_FL_SOFT_MODE)
+ buf = "1*\n";
+ else
+ buf = "1\n";
+ } else
buf = "0\n";
- return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2);
+ return simple_read_from_buffer(ubuf, cnt, ppos, buf, strlen(buf));
}
static ssize_t
event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt,
loff_t *ppos)
{
- struct ftrace_event_call *call = filp->private_data;
- char buf[64];
+ struct ftrace_event_file *file;
unsigned long val;
int ret;
- if (cnt >= sizeof(buf))
- return -EINVAL;
-
- if (copy_from_user(&buf, ubuf, cnt))
- return -EFAULT;
-
- buf[cnt] = 0;
-
- ret = strict_strtoul(buf, 10, &val);
- if (ret < 0)
+ ret = kstrtoul_from_user(ubuf, cnt, 10, &val);
+ if (ret)
return ret;
ret = tracing_update_buffers();
switch (val) {
case 0:
case 1:
+ ret = -ENODEV;
mutex_lock(&event_mutex);
- ftrace_event_enable_disable(call, val);
+ file = event_file_data(filp);
+ if (likely(file))
+ ret = ftrace_event_enable_disable(file, val);
mutex_unlock(&event_mutex);
break;
*ppos += cnt;
- return cnt;
+ return ret ? ret : cnt;
}
static ssize_t
loff_t *ppos)
{
const char set_to_char[4] = { '?', '0', '1', 'X' };
- const char *system = filp->private_data;
+ struct ftrace_subsystem_dir *dir = filp->private_data;
+ struct event_subsystem *system = dir->subsystem;
struct ftrace_event_call *call;
+ struct ftrace_event_file *file;
+ struct trace_array *tr = dir->tr;
char buf[2];
int set = 0;
int ret;
mutex_lock(&event_mutex);
- list_for_each_entry(call, &ftrace_events, list) {
- if (!call->name || !call->regfunc)
+ list_for_each_entry(file, &tr->events, list) {
+ call = file->event_call;
+ if (!call->name || !call->class || !call->class->reg)
continue;
- if (system && strcmp(call->system, system) != 0)
+ if (system && strcmp(call->class->system, system->name) != 0)
continue;
/*
* or if all events or cleared, or if we have
* a mixture.
*/
- set |= (1 << !!call->enabled);
+ set |= (1 << !!(file->flags & FTRACE_EVENT_FL_ENABLED));
/*
* If we have a mixture, no need to look further.
system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt,
loff_t *ppos)
{
- const char *system = filp->private_data;
+ struct ftrace_subsystem_dir *dir = filp->private_data;
+ struct event_subsystem *system = dir->subsystem;
+ const char *name = NULL;
unsigned long val;
- char buf[64];
ssize_t ret;
- if (cnt >= sizeof(buf))
- return -EINVAL;
-
- if (copy_from_user(&buf, ubuf, cnt))
- return -EFAULT;
-
- buf[cnt] = 0;
-
- ret = strict_strtoul(buf, 10, &val);
- if (ret < 0)
+ ret = kstrtoul_from_user(ubuf, cnt, 10, &val);
+ if (ret)
return ret;
ret = tracing_update_buffers();
if (val != 0 && val != 1)
return -EINVAL;
- ret = __ftrace_set_clr_event(NULL, system, NULL, val);
+ /*
+ * 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;
return ret;
}
-extern char *__bad_type_size(void);
-
-#undef FIELD
-#define FIELD(type, name) \
- sizeof(type) != sizeof(field.name) ? __bad_type_size() : \
- #type, "common_" #name, offsetof(typeof(field), name), \
- sizeof(field.name)
+enum {
+ FORMAT_HEADER = 1,
+ FORMAT_FIELD_SEPERATOR = 2,
+ FORMAT_PRINTFMT = 3,
+};
-static int trace_write_header(struct trace_seq *s)
+static void *f_next(struct seq_file *m, void *v, loff_t *pos)
{
- struct trace_entry field;
+ struct ftrace_event_call *call = event_file_data(m->private);
+ struct ftrace_event_field *field;
+ struct list_head *common_head = &ftrace_common_fields;
+ struct list_head *head = trace_get_fields(call);
- /* struct trace_entry */
- return trace_seq_printf(s,
- "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
- "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
- "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
- "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
- "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
- "\n",
- FIELD(unsigned short, type),
- FIELD(unsigned char, flags),
- FIELD(unsigned char, preempt_count),
- FIELD(int, pid),
- FIELD(int, lock_depth));
-}
+ (*pos)++;
-static ssize_t
-event_format_read(struct file *filp, char __user *ubuf, size_t cnt,
- loff_t *ppos)
-{
- struct ftrace_event_call *call = filp->private_data;
- struct trace_seq *s;
- char *buf;
- int r;
+ switch ((unsigned long)v) {
+ case FORMAT_HEADER:
+ if (unlikely(list_empty(common_head)))
+ return NULL;
- if (*ppos)
- return 0;
+ field = list_entry(common_head->prev,
+ struct ftrace_event_field, link);
+ return field;
- s = kmalloc(sizeof(*s), GFP_KERNEL);
- if (!s)
- return -ENOMEM;
+ case FORMAT_FIELD_SEPERATOR:
+ if (unlikely(list_empty(head)))
+ return NULL;
- trace_seq_init(s);
+ field = list_entry(head->prev, struct ftrace_event_field, link);
+ return field;
- /* If any of the first writes fail, so will the show_format. */
+ case FORMAT_PRINTFMT:
+ /* all done */
+ return NULL;
+ }
- trace_seq_printf(s, "name: %s\n", call->name);
- trace_seq_printf(s, "ID: %d\n", call->id);
- trace_seq_printf(s, "format:\n");
- trace_write_header(s);
+ field = v;
+ if (field->link.prev == common_head)
+ return (void *)FORMAT_FIELD_SEPERATOR;
+ else if (field->link.prev == head)
+ return (void *)FORMAT_PRINTFMT;
- r = call->show_format(call, s);
- if (!r) {
- /*
- * ug! The format output is bigger than a PAGE!!
- */
- buf = "FORMAT TOO BIG\n";
- r = simple_read_from_buffer(ubuf, cnt, ppos,
- buf, strlen(buf));
- goto out;
- }
+ field = list_entry(field->link.prev, struct ftrace_event_field, link);
- r = simple_read_from_buffer(ubuf, cnt, ppos,
- s->buffer, s->len);
- out:
- kfree(s);
- return r;
+ return field;
}
-static ssize_t
-event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos)
+static void *f_start(struct seq_file *m, loff_t *pos)
{
- struct ftrace_event_call *call = filp->private_data;
- struct trace_seq *s;
- int r;
+ loff_t l = 0;
+ void *p;
- if (*ppos)
- return 0;
+ /* ->stop() is called even if ->start() fails */
+ mutex_lock(&event_mutex);
+ if (!event_file_data(m->private))
+ return ERR_PTR(-ENODEV);
- s = kmalloc(sizeof(*s), GFP_KERNEL);
- if (!s)
- return -ENOMEM;
+ /* Start by showing the header */
+ if (!*pos)
+ return (void *)FORMAT_HEADER;
- trace_seq_init(s);
- trace_seq_printf(s, "%d\n", call->id);
+ p = (void *)FORMAT_HEADER;
+ do {
+ p = f_next(m, p, &l);
+ } while (p && l < *pos);
- r = simple_read_from_buffer(ubuf, cnt, ppos,
- s->buffer, s->len);
- kfree(s);
- return r;
+ return p;
}
-static ssize_t
-event_filter_read(struct file *filp, char __user *ubuf, size_t cnt,
- loff_t *ppos)
+static int f_show(struct seq_file *m, void *v)
{
- struct ftrace_event_call *call = filp->private_data;
- struct trace_seq *s;
- int r;
+ struct ftrace_event_call *call = event_file_data(m->private);
+ struct ftrace_event_field *field;
+ const char *array_descriptor;
- if (*ppos)
+ switch ((unsigned long)v) {
+ case FORMAT_HEADER:
+ seq_printf(m, "name: %s\n", call->name);
+ seq_printf(m, "ID: %d\n", call->event.type);
+ seq_printf(m, "format:\n");
return 0;
- s = kmalloc(sizeof(*s), GFP_KERNEL);
- if (!s)
- return -ENOMEM;
+ case FORMAT_FIELD_SEPERATOR:
+ seq_putc(m, '\n');
+ return 0;
- trace_seq_init(s);
+ case FORMAT_PRINTFMT:
+ seq_printf(m, "\nprint fmt: %s\n",
+ call->print_fmt);
+ return 0;
+ }
- print_event_filter(call, s);
- r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len);
+ field = v;
+
+ /*
+ * 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_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);
+ struct trace_seq *s;
+ int r;
+
+ if (*ppos)
+ return 0;
+
+ if (unlikely(!id))
+ return -ENODEV;
+
+ s = kmalloc(sizeof(*s), GFP_KERNEL);
+ if (!s)
+ return -ENOMEM;
+
+ trace_seq_init(s);
+ trace_seq_printf(s, "%d\n", id);
+
+ r = simple_read_from_buffer(ubuf, cnt, ppos,
+ s->buffer, s->len);
+ kfree(s);
+ return r;
+}
+
+static ssize_t
+event_filter_read(struct file *filp, char __user *ubuf, size_t cnt,
+ loff_t *ppos)
+{
+ struct ftrace_event_call *call;
+ 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);
+ call = event_file_data(filp);
+ if (call)
+ print_event_filter(call, s);
+ mutex_unlock(&event_mutex);
+
+ if (call)
+ r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len);
kfree(s);
event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt,
loff_t *ppos)
{
- struct ftrace_event_call *call = filp->private_data;
+ struct ftrace_event_call *call;
char *buf;
- int err;
+ int err = -ENODEV;
if (cnt >= PAGE_SIZE)
return -EINVAL;
}
buf[cnt] = '\0';
- err = apply_event_filter(call, buf);
+ mutex_lock(&event_mutex);
+ call = event_file_data(filp);
+ if (call)
+ err = apply_event_filter(call, buf);
+ mutex_unlock(&event_mutex);
+
free_page((unsigned long) buf);
if (err < 0)
return err;
return cnt;
}
+static LIST_HEAD(event_subsystems);
+
+static int subsystem_open(struct inode *inode, struct file *filp)
+{
+ struct event_subsystem *system = NULL;
+ struct ftrace_subsystem_dir *dir = NULL; /* Initialize for gcc */
+ struct trace_array *tr;
+ int ret;
+
+ /* Make sure the system still exists */
+ mutex_lock(&trace_types_lock);
+ mutex_lock(&event_mutex);
+ list_for_each_entry(tr, &ftrace_trace_arrays, list) {
+ list_for_each_entry(dir, &tr->systems, list) {
+ if (dir == inode->i_private) {
+ /* Don't open systems with no events */
+ if (dir->nr_events) {
+ __get_system_dir(dir);
+ system = dir->subsystem;
+ }
+ goto exit_loop;
+ }
+ }
+ }
+ exit_loop:
+ mutex_unlock(&event_mutex);
+ mutex_unlock(&trace_types_lock);
+
+ if (!system)
+ return -ENODEV;
+
+ /* Some versions of gcc think dir can be uninitialized here */
+ WARN_ON(!dir);
+
+ /* Still need to increment the ref count of the system */
+ if (trace_array_get(tr) < 0) {
+ put_system(dir);
+ return -ENODEV;
+ }
+
+ ret = tracing_open_generic(inode, filp);
+ if (ret < 0) {
+ trace_array_put(tr);
+ put_system(dir);
+ }
+
+ return ret;
+}
+
+static int system_tr_open(struct inode *inode, struct file *filp)
+{
+ struct ftrace_subsystem_dir *dir;
+ struct trace_array *tr = inode->i_private;
+ int ret;
+
+ if (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);
+ }
+
+ filp->private_data = dir;
+
+ return ret;
+}
+
+static int subsystem_release(struct inode *inode, struct file *file)
+{
+ struct ftrace_subsystem_dir *dir = file->private_data;
+
+ trace_array_put(dir->tr);
+
+ /*
+ * If dir->subsystem is NULL, then this is a temporary
+ * descriptor that was made for a trace_array to enable
+ * all subsystems.
+ */
+ if (dir->subsystem)
+ put_system(dir);
+ else
+ kfree(dir);
+
+ return 0;
+}
+
static ssize_t
subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt,
loff_t *ppos)
{
- struct event_subsystem *system = filp->private_data;
+ struct ftrace_subsystem_dir *dir = filp->private_data;
+ struct event_subsystem *system = dir->subsystem;
struct trace_seq *s;
int r;
subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt,
loff_t *ppos)
{
- struct event_subsystem *system = filp->private_data;
+ struct ftrace_subsystem_dir *dir = filp->private_data;
char *buf;
int err;
}
buf[cnt] = '\0';
- err = apply_subsystem_event_filter(system, buf);
+ err = apply_subsystem_event_filter(dir, buf);
free_page((unsigned long) buf);
if (err < 0)
return err;
return r;
}
+static int ftrace_event_avail_open(struct inode *inode, struct file *file);
+static int ftrace_event_set_open(struct inode *inode, struct file *file);
+static int ftrace_event_release(struct inode *inode, struct file *file);
+
static const struct seq_operations show_event_seq_ops = {
.start = t_start,
.next = t_next,
};
static const struct file_operations ftrace_avail_fops = {
- .open = ftrace_event_seq_open,
+ .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_seq_open,
+ .open = ftrace_event_set_open,
.read = seq_read,
.write = ftrace_event_write,
.llseek = seq_lseek,
- .release = seq_release,
+ .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 = tracing_open_generic,
- .read = event_format_read,
+ .open = trace_format_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
};
static const struct file_operations ftrace_event_id_fops = {
- .open = tracing_open_generic,
.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 = tracing_open_generic,
+ .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 = tracing_open_generic,
+ .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 struct dentry *event_trace_events_dir(void)
+static int
+ftrace_event_open(struct inode *inode, struct file *file,
+ const struct seq_operations *seq_ops)
{
- static struct dentry *d_tracer;
- static struct dentry *d_events;
+ struct seq_file *m;
+ int ret;
- if (d_events)
- return d_events;
+ 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;
- d_tracer = tracing_init_dentry();
- if (!d_tracer)
- return NULL;
+ return ret;
+}
- d_events = debugfs_create_dir("events", d_tracer);
- if (!d_events)
- pr_warning("Could not create debugfs "
- "'events' directory\n");
+static int ftrace_event_release(struct inode *inode, struct file *file)
+{
+ struct trace_array *tr = inode->i_private;
- return d_events;
+ trace_array_put(tr);
+
+ return seq_release(inode, file);
}
-static LIST_HEAD(event_subsystems);
+static int
+ftrace_event_avail_open(struct inode *inode, struct file *file)
+{
+ const struct seq_operations *seq_ops = &show_event_seq_ops;
+
+ return ftrace_event_open(inode, file, seq_ops);
+}
+
+static int
+ftrace_event_set_open(struct inode *inode, struct file *file)
+{
+ const struct seq_operations *seq_ops = &show_set_event_seq_ops;
+ struct trace_array *tr = inode->i_private;
+ int ret;
+
+ if (trace_array_get(tr) < 0)
+ return -ENODEV;
+
+ if ((file->f_mode & FMODE_WRITE) &&
+ (file->f_flags & O_TRUNC))
+ ftrace_clear_events(tr);
+
+ ret = ftrace_event_open(inode, file, seq_ops);
+ if (ret < 0)
+ trace_array_put(tr);
+ return ret;
+}
+
+static struct event_subsystem *
+create_new_subsystem(const char *name)
+{
+ struct event_subsystem *system;
+
+ /* need to create new entry */
+ system = kmalloc(sizeof(*system), GFP_KERNEL);
+ if (!system)
+ return NULL;
+
+ system->ref_count = 1;
+
+ /* Only allocate if dynamic (kprobes and modules) */
+ if (!core_kernel_data((unsigned long)name)) {
+ system->ref_count |= SYSTEM_FL_FREE_NAME;
+ system->name = kstrdup(name, GFP_KERNEL);
+ if (!system->name)
+ goto out_free;
+ } else
+ system->name = name;
+
+ system->filter = NULL;
+
+ system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL);
+ if (!system->filter)
+ goto out_free;
+
+ list_add(&system->list, &event_subsystems);
+
+ return system;
+
+ out_free:
+ if (system->ref_count & SYSTEM_FL_FREE_NAME)
+ kfree(system->name);
+ kfree(system);
+ return NULL;
+}
static struct dentry *
-event_subsystem_dir(const char *name, struct dentry *d_events)
+event_subsystem_dir(struct trace_array *tr, const char *name,
+ struct ftrace_event_file *file, struct dentry *parent)
{
+ struct ftrace_subsystem_dir *dir;
struct event_subsystem *system;
struct dentry *entry;
/* First see if we did not already create this dir */
- list_for_each_entry(system, &event_subsystems, list) {
+ list_for_each_entry(dir, &tr->systems, list) {
+ system = dir->subsystem;
if (strcmp(system->name, name) == 0) {
- system->nr_events++;
- return system->entry;
+ dir->nr_events++;
+ file->system = dir;
+ return dir->entry;
}
}
- /* need to create new entry */
- system = kmalloc(sizeof(*system), GFP_KERNEL);
- if (!system) {
- pr_warning("No memory to create event subsystem %s\n",
- name);
- return d_events;
+ /* 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;
- system->entry = debugfs_create_dir(name, d_events);
- if (!system->entry) {
- pr_warning("Could not create event subsystem %s\n",
- name);
- kfree(system);
- return d_events;
- }
+ dir = kmalloc(sizeof(*dir), GFP_KERNEL);
+ if (!dir)
+ goto out_fail;
- system->nr_events = 1;
- system->name = kstrdup(name, GFP_KERNEL);
- if (!system->name) {
- debugfs_remove(system->entry);
- kfree(system);
- return d_events;
+ if (!system) {
+ system = create_new_subsystem(name);
+ if (!system)
+ goto out_free;
+ } else
+ __get_system(system);
+
+ dir->entry = debugfs_create_dir(name, parent);
+ if (!dir->entry) {
+ pr_warning("Failed to create system directory %s\n", name);
+ __put_system(system);
+ goto out_free;
}
- list_add(&system->list, &event_subsystems);
-
- system->filter = NULL;
-
- system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL);
- if (!system->filter) {
- pr_warning("Could not allocate filter for subsystem "
- "'%s'\n", name);
- return system->entry;
- }
+ dir->tr = tr;
+ dir->ref_count = 1;
+ dir->nr_events = 1;
+ dir->subsystem = system;
+ file->system = dir;
- entry = debugfs_create_file("filter", 0644, system->entry, system,
+ entry = debugfs_create_file("filter", 0644, dir->entry, dir,
&ftrace_subsystem_filter_fops);
if (!entry) {
kfree(system->filter);
system->filter = NULL;
- pr_warning("Could not create debugfs "
- "'%s/filter' entry\n", name);
+ pr_warning("Could not create debugfs '%s/filter' entry\n", name);
}
- entry = trace_create_file("enable", 0644, system->entry,
- (void *)system->name,
- &ftrace_system_enable_fops);
+ trace_create_file("enable", 0644, dir->entry, dir,
+ &ftrace_system_enable_fops);
+
+ list_add(&dir->list, &tr->systems);
- return system->entry;
+ return dir->entry;
+
+ out_free:
+ kfree(dir);
+ out_fail:
+ /* Only print this message if failed on memory allocation */
+ if (!dir || !system)
+ pr_warning("No memory to create event subsystem %s\n",
+ name);
+ return NULL;
}
static int
-event_create_dir(struct ftrace_event_call *call, struct dentry *d_events,
+event_create_dir(struct dentry *parent,
+ struct ftrace_event_file *file,
const struct file_operations *id,
const struct file_operations *enable,
const struct file_operations *filter,
const struct file_operations *format)
{
- struct dentry *entry;
+ struct ftrace_event_call *call = file->event_call;
+ struct trace_array *tr = file->tr;
+ struct list_head *head;
+ struct dentry *d_events;
int ret;
/*
* If the trace point header did not define TRACE_SYSTEM
* then the system would be called "TRACE_SYSTEM".
*/
- if (strcmp(call->system, TRACE_SYSTEM) != 0)
- d_events = event_subsystem_dir(call->system, d_events);
-
- call->dir = debugfs_create_dir(call->name, d_events);
- if (!call->dir) {
- pr_warning("Could not create debugfs "
- "'%s' directory\n", call->name);
+ 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;
+
+ file->dir = debugfs_create_dir(call->name, d_events);
+ if (!file->dir) {
+ pr_warning("Could not create debugfs '%s' directory\n",
+ call->name);
return -1;
}
- if (call->regfunc)
- entry = trace_create_file("enable", 0644, call->dir, call,
- enable);
+ if (call->class->reg && !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE))
+ trace_create_file("enable", 0644, file->dir, file,
+ enable);
- if (call->id && call->profile_enable)
- entry = trace_create_file("id", 0444, call->dir, call,
- id);
+#ifdef CONFIG_PERF_EVENTS
+ if (call->event.type && call->class->reg)
+ trace_create_file("id", 0444, file->dir,
+ (void *)(long)call->event.type, id);
+#endif
- if (call->define_fields) {
- ret = call->define_fields(call);
+ /*
+ * 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_warning("Could not initialize trace point"
" events/%s\n", call->name);
- return ret;
+ return -1;
}
- entry = trace_create_file("filter", 0644, call->dir, call,
- filter);
}
+ trace_create_file("filter", 0644, file->dir, call,
+ filter);
- /* A trace may not want to export its format */
- if (!call->show_format)
- return 0;
+ trace_create_file("format", 0444, file->dir, call,
+ format);
+
+ return 0;
+}
+
+static void remove_event_from_tracers(struct ftrace_event_call *call)
+{
+ struct ftrace_event_file *file;
+ struct trace_array *tr;
- entry = trace_create_file("format", 0444, call->dir, call,
- format);
+ do_for_each_event_file_safe(tr, file) {
+ if (file->event_call != call)
+ continue;
+
+ remove_event_file_dir(file);
+ /*
+ * The do_for_each_event_file_safe() is
+ * a double loop. After finding the call for this
+ * trace_array, we use break to jump to the next
+ * trace_array.
+ */
+ break;
+ } while_for_each_event_file();
+}
+
+static void event_remove(struct ftrace_event_call *call)
+{
+ struct trace_array *tr;
+ struct ftrace_event_file *file;
+
+ do_for_each_event_file(tr, file) {
+ if (file->event_call != call)
+ continue;
+ ftrace_event_enable_disable(file, 0);
+ /*
+ * The do_for_each_event_file() is
+ * a double loop. After finding the call for this
+ * trace_array, we use break to jump to the next
+ * trace_array.
+ */
+ break;
+ } while_for_each_event_file();
+
+ if (call->event.funcs)
+ __unregister_ftrace_event(&call->event);
+ remove_event_from_tracers(call);
+ list_del(&call->list);
+}
+
+static int event_init(struct ftrace_event_call *call)
+{
+ int ret = 0;
+
+ if (WARN_ON(!call->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",
+ call->name);
+ }
+
+ return ret;
+}
+
+static int
+__register_event(struct ftrace_event_call *call, struct module *mod)
+{
+ int ret;
+
+ ret = event_init(call);
+ if (ret < 0)
+ return ret;
+
+ list_add(&call->list, &ftrace_events);
+ call->mod = mod;
return 0;
}
+static struct ftrace_event_file *
+trace_create_new_event(struct ftrace_event_call *call,
+ struct trace_array *tr)
+{
+ struct ftrace_event_file *file;
+
+ file = kmem_cache_alloc(file_cachep, GFP_TRACE);
+ if (!file)
+ return NULL;
+
+ file->event_call = call;
+ file->tr = tr;
+ atomic_set(&file->sm_ref, 0);
+ list_add(&file->list, &tr->events);
+
+ return file;
+}
+
+/* Add an event to a trace directory */
+static int
+__trace_add_new_event(struct ftrace_event_call *call,
+ struct trace_array *tr,
+ const struct file_operations *id,
+ const struct file_operations *enable,
+ const struct file_operations *filter,
+ const struct file_operations *format)
+{
+ struct ftrace_event_file *file;
+
+ file = trace_create_new_event(call, tr);
+ if (!file)
+ return -ENOMEM;
+
+ return event_create_dir(tr->event_dir, file, id, enable, filter, format);
+}
+
+/*
+ * Just create a decriptor for early init. A descriptor is required
+ * for enabling events at boot. We want to enable events before
+ * the filesystem is initialized.
+ */
+static __init int
+__trace_early_add_new_event(struct ftrace_event_call *call,
+ struct trace_array *tr)
+{
+ struct ftrace_event_file *file;
+
+ file = trace_create_new_event(call, tr);
+ if (!file)
+ return -ENOMEM;
+
+ return 0;
+}
+
+struct ftrace_module_file_ops;
+static void __add_event_to_tracers(struct ftrace_event_call *call,
+ struct ftrace_module_file_ops *file_ops);
+
+/* Add an additional event_call dynamically */
+int trace_add_event_call(struct ftrace_event_call *call)
+{
+ int ret;
+ mutex_lock(&trace_types_lock);
+ mutex_lock(&event_mutex);
+
+ ret = __register_event(call, NULL);
+ if (ret >= 0)
+ __add_event_to_tracers(call, NULL);
+
+ mutex_unlock(&event_mutex);
+ mutex_unlock(&trace_types_lock);
+ return ret;
+}
+
+/*
+ * Must be called under locking of trace_types_lock, event_mutex and
+ * trace_event_sem.
+ */
+static void __trace_remove_event_call(struct ftrace_event_call *call)
+{
+ event_remove(call);
+ trace_destroy_fields(call);
+ destroy_preds(call);
+}
+
+/* Remove an event_call */
+void trace_remove_event_call(struct ftrace_event_call *call)
+{
+ mutex_lock(&trace_types_lock);
+ mutex_lock(&event_mutex);
+ down_write(&trace_event_sem);
+ __trace_remove_event_call(call);
+ up_write(&trace_event_sem);
+ mutex_unlock(&event_mutex);
+ mutex_unlock(&trace_types_lock);
+}
+
#define for_each_event(event, start, end) \
for (event = start; \
(unsigned long)event < (unsigned long)end; \
struct file_operations filter;
};
-static void remove_subsystem_dir(const char *name)
-{
- struct event_subsystem *system;
+static struct ftrace_module_file_ops *
+find_ftrace_file_ops(struct ftrace_module_file_ops *file_ops, struct module *mod)
+{
+ /*
+ * As event_calls are added in groups by module,
+ * when we find one file_ops, we don't need to search for
+ * each call in that module, as the rest should be the
+ * same. Only search for a new one if the last one did
+ * not match.
+ */
+ if (file_ops && mod == file_ops->mod)
+ return file_ops;
+
+ list_for_each_entry(file_ops, &ftrace_module_file_list, list) {
+ if (file_ops->mod == mod)
+ return file_ops;
+ }
+ return NULL;
+}
+
+static struct ftrace_module_file_ops *
+trace_create_file_ops(struct module *mod)
+{
+ struct ftrace_module_file_ops *file_ops;
+
+ /*
+ * This is a bit of a PITA. To allow for correct reference
+ * counting, modules must "own" their file_operations.
+ * To do this, we allocate the file operations that will be
+ * used in the event directory.
+ */
+
+ file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL);
+ if (!file_ops)
+ return NULL;
+
+ file_ops->mod = mod;
+
+ file_ops->id = ftrace_event_id_fops;
+ file_ops->id.owner = mod;
+
+ file_ops->enable = ftrace_enable_fops;
+ file_ops->enable.owner = mod;
+
+ file_ops->filter = ftrace_event_filter_fops;
+ file_ops->filter.owner = mod;
+
+ file_ops->format = ftrace_event_format_fops;
+ file_ops->format.owner = mod;
+
+ list_add(&file_ops->list, &ftrace_module_file_list);
+
+ return file_ops;
+}
+
+static void trace_module_add_events(struct module *mod)
+{
+ struct ftrace_module_file_ops *file_ops = NULL;
+ struct ftrace_event_call **call, **start, **end;
+
+ start = mod->trace_events;
+ end = mod->trace_events + mod->num_trace_events;
+
+ if (start == end)
+ return;
+
+ file_ops = trace_create_file_ops(mod);
+ if (!file_ops)
+ return;
+
+ for_each_event(call, start, end) {
+ __register_event(*call, mod);
+ __add_event_to_tracers(*call, file_ops);
+ }
+}
+
+static void trace_module_remove_events(struct module *mod)
+{
+ struct ftrace_module_file_ops *file_ops;
+ struct ftrace_event_call *call, *p;
+ bool clear_trace = false;
+
+ down_write(&trace_event_sem);
+ list_for_each_entry_safe(call, p, &ftrace_events, list) {
+ if (call->mod == mod) {
+ if (call->flags & TRACE_EVENT_FL_WAS_ENABLED)
+ clear_trace = true;
+ __trace_remove_event_call(call);
+ }
+ }
+
+ /* Now free the file_operations */
+ list_for_each_entry(file_ops, &ftrace_module_file_list, list) {
+ if (file_ops->mod == mod)
+ break;
+ }
+ if (&file_ops->list != &ftrace_module_file_list) {
+ list_del(&file_ops->list);
+ kfree(file_ops);
+ }
+ 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 int
+__trace_add_new_mod_event(struct ftrace_event_call *call,
+ struct trace_array *tr,
+ struct ftrace_module_file_ops *file_ops)
+{
+ return __trace_add_new_event(call, tr,
+ &file_ops->id, &file_ops->enable,
+ &file_ops->filter, &file_ops->format);
+}
+
+#else
+static inline struct ftrace_module_file_ops *
+find_ftrace_file_ops(struct ftrace_module_file_ops *file_ops, struct module *mod)
+{
+ return NULL;
+}
+static inline int trace_module_notify(struct notifier_block *self,
+ unsigned long val, void *data)
+{
+ return 0;
+}
+static inline int
+__trace_add_new_mod_event(struct ftrace_event_call *call,
+ struct trace_array *tr,
+ struct ftrace_module_file_ops *file_ops)
+{
+ return -ENODEV;
+}
+#endif /* CONFIG_MODULES */
+
+/* Create a new event directory structure for a trace directory. */
+static void
+__trace_add_event_dirs(struct trace_array *tr)
+{
+ struct ftrace_module_file_ops *file_ops = NULL;
+ struct ftrace_event_call *call;
+ int ret;
+
+ list_for_each_entry(call, &ftrace_events, list) {
+ if (call->mod) {
+ /*
+ * Directories for events by modules need to
+ * keep module ref counts when opened (as we don't
+ * want the module to disappear when reading one
+ * of these files). The file_ops keep account of
+ * the module ref count.
+ */
+ file_ops = find_ftrace_file_ops(file_ops, call->mod);
+ if (!file_ops)
+ continue; /* Warn? */
+ ret = __trace_add_new_mod_event(call, tr, file_ops);
+ if (ret < 0)
+ pr_warning("Could not create directory for event %s\n",
+ call->name);
+ continue;
+ }
+ ret = __trace_add_new_event(call, tr,
+ &ftrace_event_id_fops,
+ &ftrace_enable_fops,
+ &ftrace_event_filter_fops,
+ &ftrace_event_format_fops);
+ if (ret < 0)
+ pr_warning("Could not create directory for event %s\n",
+ call->name);
+ }
+}
+
+#ifdef CONFIG_DYNAMIC_FTRACE
+
+/* Avoid typos */
+#define ENABLE_EVENT_STR "enable_event"
+#define DISABLE_EVENT_STR "disable_event"
+
+struct event_probe_data {
+ struct ftrace_event_file *file;
+ unsigned long count;
+ int ref;
+ bool enable;
+};
+
+static struct ftrace_event_file *
+find_event_file(struct trace_array *tr, const char *system, const char *event)
+{
+ struct ftrace_event_file *file;
+ struct ftrace_event_call *call;
+
+ list_for_each_entry(file, &tr->events, list) {
+
+ call = file->event_call;
+
+ if (!call->name || !call->class || !call->class->reg)
+ continue;
+
+ if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)
+ continue;
+
+ if (strcmp(event, call->name) == 0 &&
+ strcmp(system, call->class->system) == 0)
+ return file;
+ }
+ return NULL;
+}
+
+static void
+event_enable_probe(unsigned long ip, unsigned long parent_ip, void **_data)
+{
+ struct event_probe_data **pdata = (struct event_probe_data **)_data;
+ struct event_probe_data *data = *pdata;
+
+ if (!data)
+ return;
+
+ if (data->enable)
+ clear_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &data->file->flags);
+ else
+ set_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &data->file->flags);
+}
+
+static void
+event_enable_count_probe(unsigned long ip, unsigned long parent_ip, void **_data)
+{
+ struct event_probe_data **pdata = (struct event_probe_data **)_data;
+ struct event_probe_data *data = *pdata;
+
+ if (!data)
+ return;
+
+ if (!data->count)
+ return;
+
+ /* Skip if the event is in a state we want to switch to */
+ if (data->enable == !(data->file->flags & FTRACE_EVENT_FL_SOFT_DISABLED))
+ return;
+
+ if (data->count != -1)
+ (data->count)--;
+
+ event_enable_probe(ip, parent_ip, _data);
+}
+
+static int
+event_enable_print(struct seq_file *m, unsigned long ip,
+ struct ftrace_probe_ops *ops, void *_data)
+{
+ struct event_probe_data *data = _data;
+
+ seq_printf(m, "%ps:", (void *)ip);
+
+ seq_printf(m, "%s:%s:%s",
+ data->enable ? ENABLE_EVENT_STR : DISABLE_EVENT_STR,
+ data->file->event_call->class->system,
+ data->file->event_call->name);
+
+ if (data->count == -1)
+ seq_printf(m, ":unlimited\n");
+ else
+ seq_printf(m, ":count=%ld\n", data->count);
+
+ return 0;
+}
+
+static int
+event_enable_init(struct ftrace_probe_ops *ops, unsigned long ip,
+ void **_data)
+{
+ struct event_probe_data **pdata = (struct event_probe_data **)_data;
+ struct event_probe_data *data = *pdata;
+
+ data->ref++;
+ return 0;
+}
+
+static void
+event_enable_free(struct ftrace_probe_ops *ops, unsigned long ip,
+ void **_data)
+{
+ struct event_probe_data **pdata = (struct event_probe_data **)_data;
+ struct event_probe_data *data = *pdata;
+
+ if (WARN_ON_ONCE(data->ref <= 0))
+ return;
+
+ data->ref--;
+ if (!data->ref) {
+ /* Remove the SOFT_MODE flag */
+ __ftrace_event_enable_disable(data->file, 0, 1);
+ module_put(data->file->event_call->mod);
+ kfree(data);
+ }
+ *pdata = NULL;
+}
+
+static struct ftrace_probe_ops event_enable_probe_ops = {
+ .func = event_enable_probe,
+ .print = event_enable_print,
+ .init = event_enable_init,
+ .free = event_enable_free,
+};
+
+static struct ftrace_probe_ops event_enable_count_probe_ops = {
+ .func = event_enable_count_probe,
+ .print = event_enable_print,
+ .init = event_enable_init,
+ .free = event_enable_free,
+};
+
+static struct ftrace_probe_ops event_disable_probe_ops = {
+ .func = event_enable_probe,
+ .print = event_enable_print,
+ .init = event_enable_init,
+ .free = event_enable_free,
+};
+
+static struct ftrace_probe_ops event_disable_count_probe_ops = {
+ .func = event_enable_count_probe,
+ .print = event_enable_print,
+ .init = event_enable_init,
+ .free = event_enable_free,
+};
+
+static int
+event_enable_func(struct ftrace_hash *hash,
+ char *glob, char *cmd, char *param, int enabled)
+{
+ struct trace_array *tr = top_trace_array();
+ struct ftrace_event_file *file;
+ struct ftrace_probe_ops *ops;
+ struct event_probe_data *data;
+ const char *system;
+ const char *event;
+ char *number;
+ bool enable;
+ int ret;
+
+ /* hash funcs only work with set_ftrace_filter */
+ if (!enabled)
+ return -EINVAL;
+
+ if (!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 (strcmp(name, TRACE_SYSTEM) == 0)
- return;
+ 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;
- list_for_each_entry(system, &event_subsystems, list) {
- if (strcmp(system->name, name) == 0) {
- if (!--system->nr_events) {
- struct event_filter *filter = system->filter;
-
- debugfs_remove_recursive(system->entry);
- list_del(&system->list);
- if (filter) {
- kfree(filter->filter_string);
- kfree(filter);
- }
- kfree(system->name);
- kfree(system);
- }
- break;
- }
+ if (glob[0] == '!') {
+ unregister_ftrace_function_probe_func(glob+1, ops);
+ ret = 0;
+ goto out;
}
-}
-static struct ftrace_module_file_ops *
-trace_create_file_ops(struct module *mod)
-{
- struct ftrace_module_file_ops *file_ops;
+ ret = -ENOMEM;
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ goto out;
- /*
- * This is a bit of a PITA. To allow for correct reference
- * counting, modules must "own" their file_operations.
- * To do this, we allocate the file operations that will be
- * used in the event directory.
- */
+ data->enable = enable;
+ data->count = -1;
+ data->file = file;
- file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL);
- if (!file_ops)
- return NULL;
+ if (!param)
+ goto out_reg;
- file_ops->mod = mod;
+ number = strsep(¶m, ":");
- file_ops->id = ftrace_event_id_fops;
- file_ops->id.owner = mod;
+ ret = -EINVAL;
+ if (!strlen(number))
+ goto out_free;
- file_ops->enable = ftrace_enable_fops;
- file_ops->enable.owner = mod;
+ /*
+ * 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;
+ }
- file_ops->filter = ftrace_event_filter_fops;
- file_ops->filter.owner = mod;
+ 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;
- file_ops->format = ftrace_event_format_fops;
- file_ops->format.owner = mod;
+ out_disable:
+ __ftrace_event_enable_disable(file, 0, 1);
+ out_put:
+ module_put(file->event_call->mod);
+ out_free:
+ kfree(data);
+ goto out;
+}
- list_add(&file_ops->list, &ftrace_module_file_list);
+static struct ftrace_func_command event_enable_cmd = {
+ .name = ENABLE_EVENT_STR,
+ .func = event_enable_func,
+};
- return file_ops;
-}
+static struct ftrace_func_command event_disable_cmd = {
+ .name = DISABLE_EVENT_STR,
+ .func = event_enable_func,
+};
-static void trace_module_add_events(struct module *mod)
+static __init int register_event_cmds(void)
{
- struct ftrace_module_file_ops *file_ops = NULL;
- struct ftrace_event_call *call, *start, *end;
- struct dentry *d_events;
int ret;
- start = mod->trace_events;
- end = mod->trace_events + mod->num_trace_events;
+ 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 */
- if (start == end)
- return;
+/*
+ * The top level array has already had its ftrace_event_file
+ * descriptors created in order to allow for early events to
+ * be recorded. This function is called after the debugfs has been
+ * initialized, and we now have to create the files associated
+ * to the events.
+ */
+static __init void
+__trace_early_add_event_dirs(struct trace_array *tr)
+{
+ struct ftrace_event_file *file;
+ int ret;
- d_events = event_trace_events_dir();
- if (!d_events)
- return;
- for_each_event(call, start, end) {
- /* The linker may leave blanks */
- if (!call->name)
- continue;
- if (call->raw_init) {
- ret = call->raw_init();
- if (ret < 0) {
- if (ret != -ENOSYS)
- pr_warning("Could not initialize trace "
- "point events/%s\n", call->name);
- continue;
- }
- }
- /*
- * This module has events, create file ops for this module
- * if not already done.
- */
- if (!file_ops) {
- file_ops = trace_create_file_ops(mod);
- if (!file_ops)
- return;
- }
- call->mod = mod;
- list_add(&call->list, &ftrace_events);
- event_create_dir(call, d_events,
- &file_ops->id, &file_ops->enable,
- &file_ops->filter, &file_ops->format);
+ list_for_each_entry(file, &tr->events, list) {
+ ret = event_create_dir(tr->event_dir, file,
+ &ftrace_event_id_fops,
+ &ftrace_enable_fops,
+ &ftrace_event_filter_fops,
+ &ftrace_event_format_fops);
+ if (ret < 0)
+ pr_warning("Could not create directory for event %s\n",
+ file->event_call->name);
}
}
-static void trace_module_remove_events(struct module *mod)
+/*
+ * For early boot up, the top trace array requires to have
+ * a list of events that can be enabled. This must be done before
+ * the filesystem is set up in order to allow events to be traced
+ * early.
+ */
+static __init void
+__trace_early_add_events(struct trace_array *tr)
{
- struct ftrace_module_file_ops *file_ops;
- struct ftrace_event_call *call, *p;
- bool found = false;
+ struct ftrace_event_call *call;
+ int ret;
- down_write(&trace_event_mutex);
- list_for_each_entry_safe(call, p, &ftrace_events, list) {
- if (call->mod == mod) {
- found = true;
- ftrace_event_enable_disable(call, 0);
- if (call->event)
- __unregister_ftrace_event(call->event);
- debugfs_remove_recursive(call->dir);
- list_del(&call->list);
- trace_destroy_fields(call);
- destroy_preds(call);
- remove_subsystem_dir(call->system);
- }
- }
+ list_for_each_entry(call, &ftrace_events, list) {
+ /* Early boot up should not have any modules loaded */
+ if (WARN_ON_ONCE(call->mod))
+ continue;
- /* Now free the file_operations */
- list_for_each_entry(file_ops, &ftrace_module_file_list, list) {
- if (file_ops->mod == mod)
- break;
- }
- if (&file_ops->list != &ftrace_module_file_list) {
- list_del(&file_ops->list);
- kfree(file_ops);
+ ret = __trace_early_add_new_event(call, tr);
+ if (ret < 0)
+ pr_warning("Could not create early event %s\n",
+ call->name);
}
-
- /*
- * It is safest to reset the ring buffer if the module being unloaded
- * registered any events.
- */
- if (found)
- tracing_reset_current_online_cpus();
- up_write(&trace_event_mutex);
}
-static int trace_module_notify(struct notifier_block *self,
- unsigned long val, void *data)
+/* Remove the event directory structure for a trace directory. */
+static void
+__trace_remove_event_dirs(struct trace_array *tr)
{
- struct module *mod = data;
-
- 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);
+ struct ftrace_event_file *file, *next;
- return 0;
+ list_for_each_entry_safe(file, next, &tr->events, list)
+ remove_event_file_dir(file);
}
-#else
-static int trace_module_notify(struct notifier_block *self,
- unsigned long val, void *data)
+
+static void
+__add_event_to_tracers(struct ftrace_event_call *call,
+ struct ftrace_module_file_ops *file_ops)
{
- return 0;
+ struct trace_array *tr;
+
+ list_for_each_entry(tr, &ftrace_trace_arrays, list) {
+ if (file_ops)
+ __trace_add_new_mod_event(call, tr, file_ops);
+ else
+ __trace_add_new_event(call, tr,
+ &ftrace_event_id_fops,
+ &ftrace_enable_fops,
+ &ftrace_event_filter_fops,
+ &ftrace_event_format_fops);
+ }
}
-#endif /* CONFIG_MODULES */
static struct notifier_block trace_module_nb = {
.notifier_call = trace_module_notify,
.priority = 0,
};
-extern struct ftrace_event_call __start_ftrace_events[];
-extern struct ftrace_event_call __stop_ftrace_events[];
+extern struct ftrace_event_call *__start_ftrace_events[];
+extern struct ftrace_event_call *__stop_ftrace_events[];
static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata;
static __init int setup_trace_event(char *str)
{
strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE);
- ring_buffer_expanded = 1;
- tracing_selftest_disabled = 1;
+ ring_buffer_expanded = true;
+ tracing_selftest_disabled = true;
return 1;
}
__setup("trace_event=", setup_trace_event);
-static __init int event_trace_init(void)
+/* Expects to have event_mutex held when called */
+static int
+create_event_toplevel_files(struct dentry *parent, struct trace_array *tr)
{
- struct ftrace_event_call *call;
- struct dentry *d_tracer;
- struct dentry *entry;
struct dentry *d_events;
- int ret;
- char *buf = bootup_event_buf;
- char *token;
-
- d_tracer = tracing_init_dentry();
- if (!d_tracer)
- return 0;
-
- entry = debugfs_create_file("available_events", 0444, d_tracer,
- (void *)&show_event_seq_ops,
- &ftrace_avail_fops);
- if (!entry)
- pr_warning("Could not create debugfs "
- "'available_events' entry\n");
+ struct dentry *entry;
- entry = debugfs_create_file("set_event", 0644, d_tracer,
- (void *)&show_set_event_seq_ops,
- &ftrace_set_event_fops);
- if (!entry)
- pr_warning("Could not create debugfs "
- "'set_event' entry\n");
+ entry = debugfs_create_file("set_event", 0644, parent,
+ tr, &ftrace_set_event_fops);
+ if (!entry) {
+ pr_warning("Could not create debugfs 'set_event' entry\n");
+ return -ENOMEM;
+ }
- d_events = event_trace_events_dir();
- if (!d_events)
- return 0;
+ d_events = debugfs_create_dir("events", parent);
+ if (!d_events) {
+ pr_warning("Could not create debugfs 'events' directory\n");
+ return -ENOMEM;
+ }
/* ring buffer internal formats */
trace_create_file("header_page", 0444, d_events,
&ftrace_show_header_fops);
trace_create_file("enable", 0644, d_events,
- NULL, &ftrace_system_enable_fops);
+ tr, &ftrace_tr_enable_fops);
- for_each_event(call, __start_ftrace_events, __stop_ftrace_events) {
- /* The linker may leave blanks */
- if (!call->name)
- continue;
- if (call->raw_init) {
- ret = call->raw_init();
- if (ret < 0) {
- if (ret != -ENOSYS)
- pr_warning("Could not initialize trace "
- "point events/%s\n", call->name);
- continue;
- }
- }
- list_add(&call->list, &ftrace_events);
- event_create_dir(call, d_events, &ftrace_event_id_fops,
- &ftrace_enable_fops, &ftrace_event_filter_fops,
- &ftrace_event_format_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 running events */
+ __ftrace_set_clr_event_nolock(tr, NULL, NULL, NULL, 0);
+
+ down_write(&trace_event_sem);
+ __trace_remove_event_dirs(tr);
+ debugfs_remove_recursive(tr->event_dir);
+ up_write(&trace_event_sem);
+
+ tr->event_dir = NULL;
+
+ mutex_unlock(&event_mutex);
+
+ return 0;
+}
+
+static __init int event_trace_memsetup(void)
+{
+ field_cachep = KMEM_CACHE(ftrace_event_field, SLAB_PANIC);
+ file_cachep = KMEM_CACHE(ftrace_event_file, SLAB_PANIC);
+ return 0;
+}
+
+static __init int event_trace_enable(void)
+{
+ struct trace_array *tr = top_trace_array();
+ struct ftrace_event_call **iter, *call;
+ char *buf = bootup_event_buf;
+ char *token;
+ int ret;
+
+ 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);
+
while (true) {
token = strsep(&buf, ",");
if (!*token)
continue;
- ret = ftrace_set_clr_event(token, 1);
+ ret = ftrace_set_clr_event(tr, token, 1);
if (ret)
- pr_warning("Failed to enable trace event: %s\n", token);
+ pr_warn("Failed to enable trace event: %s\n", token);
}
+ trace_printk_start_comm();
+
+ register_event_cmds();
+
+ return 0;
+}
+
+static __init int event_trace_init(void)
+{
+ struct trace_array *tr;
+ struct dentry *d_tracer;
+ struct dentry *entry;
+ int ret;
+
+ tr = top_trace_array();
+
+ d_tracer = tracing_init_dentry();
+ if (!d_tracer)
+ return 0;
+
+ entry = debugfs_create_file("available_events", 0444, d_tracer,
+ tr, &ftrace_avail_fops);
+ if (!entry)
+ pr_warning("Could not create debugfs "
+ "'available_events' entry\n");
+
+ if (trace_define_common_fields())
+ pr_warning("tracing: Failed to allocate common fields");
+
+ ret = early_event_add_tracer(d_tracer, tr);
+ if (ret)
+ return ret;
+
ret = register_module_notifier(&trace_module_nb);
if (ret)
pr_warning("Failed to register trace events module notifier\n");
return 0;
}
+early_initcall(event_trace_memsetup);
+core_initcall(event_trace_enable);
fs_initcall(event_trace_init);
#ifdef CONFIG_FTRACE_STARTUP_TEST
*/
static __init void event_trace_self_tests(void)
{
+ struct ftrace_subsystem_dir *dir;
+ struct ftrace_event_file *file;
struct ftrace_event_call *call;
struct event_subsystem *system;
+ struct trace_array *tr;
int ret;
+ tr = top_trace_array();
+
pr_info("Running tests on trace events:\n");
- list_for_each_entry(call, &ftrace_events, list) {
+ 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;
- /* Only test those that have a regfunc */
- if (!call->regfunc)
+/*
+ * 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: ", call->name);
* If an event is already enabled, someone is using
* it and the self test should not be on.
*/
- if (call->enabled) {
+ if (file->flags & FTRACE_EVENT_FL_ENABLED) {
pr_warning("Enabled event during self test!\n");
WARN_ON_ONCE(1);
continue;
}
- ftrace_event_enable_disable(call, 1);
+ ftrace_event_enable_disable(file, 1);
event_test_stuff();
- ftrace_event_enable_disable(call, 0);
+ ftrace_event_enable_disable(file, 0);
pr_cont("OK\n");
}
pr_info("Running tests on trace event systems:\n");
- list_for_each_entry(system, &event_subsystems, list) {
+ list_for_each_entry(dir, &tr->systems, list) {
+
+ system = dir->subsystem;
/* the ftrace system is special, skip it */
if (strcmp(system->name, "ftrace") == 0)
pr_info("Testing event system %s: ", system->name);
- ret = __ftrace_set_clr_event(NULL, system->name, NULL, 1);
+ ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 1);
if (WARN_ON_ONCE(ret)) {
pr_warning("error enabling system %s\n",
system->name);
event_test_stuff();
- ret = __ftrace_set_clr_event(NULL, system->name, NULL, 0);
- if (WARN_ON_ONCE(ret))
+ ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 0);
+ if (WARN_ON_ONCE(ret)) {
pr_warning("error disabling system %s\n",
system->name);
+ continue;
+ }
pr_cont("OK\n");
}
pr_info("Running tests on all trace events:\n");
pr_info("Testing all events: ");
- ret = __ftrace_set_clr_event(NULL, NULL, NULL, 1);
+ ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 1);
if (WARN_ON_ONCE(ret)) {
pr_warning("error enabling all events\n");
return;
event_test_stuff();
/* reset sysname */
- ret = __ftrace_set_clr_event(NULL, NULL, NULL, 0);
+ ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0);
if (WARN_ON_ONCE(ret)) {
pr_warning("error disabling all events\n");
return;
#ifdef CONFIG_FUNCTION_TRACER
-static DEFINE_PER_CPU(atomic_t, test_event_disable);
+static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable);
static void
-function_test_events_call(unsigned long ip, unsigned long parent_ip)
+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 resched;
int cpu;
int pc;
pc = preempt_count();
- resched = ftrace_preempt_disable();
+ preempt_disable_notrace();
cpu = raw_smp_processor_id();
- disabled = atomic_inc_return(&per_cpu(test_event_disable, cpu));
+ disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu));
if (disabled != 1)
goto out;
entry->ip = ip;
entry->parent_ip = parent_ip;
- trace_nowake_buffer_unlock_commit(buffer, event, flags, pc);
+ trace_buffer_unlock_commit(buffer, event, flags, pc);
out:
- atomic_dec(&per_cpu(test_event_disable, cpu));
- ftrace_preempt_enable(resched);
+ 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)
{
- register_ftrace_function(&trace_ops);
+ int ret;
+ ret = register_ftrace_function(&trace_ops);
+ if (WARN_ON(ret < 0)) {
+ pr_info("Failed to enable function tracer for event tests\n");
+ return;
+ }
pr_info("Running tests again, along with the function tracer\n");
event_trace_self_tests();
unregister_ftrace_function(&trace_ops);
Code Review / linux-3.10.git / blobdiff