LIST_HEAD(ftrace_events);
LIST_HEAD(ftrace_common_fields);
+/* 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() \
+ }
+
struct list_head *
trace_get_fields(struct ftrace_event_call *event_call)
{
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,
- call);
+ file);
case TRACE_REG_UNREGISTER:
tracepoint_probe_unregister(call->name,
call->class->probe,
- call);
+ file);
return 0;
#ifdef CONFIG_PERF_EVENTS
void trace_event_enable_cmd_record(bool enable)
{
- struct ftrace_event_call *call;
+ struct ftrace_event_file *file;
+ struct trace_array *tr;
mutex_lock(&event_mutex);
- list_for_each_entry(call, &ftrace_events, list) {
- if (!(call->flags & TRACE_EVENT_FL_ENABLED))
+ do_for_each_event_file(tr, file) {
+
+ if (!(file->flags & FTRACE_EVENT_FL_ENABLED))
continue;
if (enable) {
tracing_start_cmdline_record();
- call->flags |= TRACE_EVENT_FL_RECORDED_CMD;
+ file->flags |= FTRACE_EVENT_FL_RECORDED_CMD;
} else {
tracing_stop_cmdline_record();
- call->flags &= ~TRACE_EVENT_FL_RECORDED_CMD;
+ file->flags &= ~FTRACE_EVENT_FL_RECORDED_CMD;
}
- }
+ } while_for_each_event_file();
mutex_unlock(&event_mutex);
}
-static int ftrace_event_enable_disable(struct ftrace_event_call *call,
- int enable)
+static int ftrace_event_enable_disable(struct ftrace_event_file *file,
+ int enable)
{
+ struct ftrace_event_call *call = file->event_call;
int ret = 0;
switch (enable) {
case 0:
- if (call->flags & TRACE_EVENT_FL_ENABLED) {
- call->flags &= ~TRACE_EVENT_FL_ENABLED;
- if (call->flags & TRACE_EVENT_FL_RECORDED_CMD) {
+ if (file->flags & FTRACE_EVENT_FL_ENABLED) {
+ file->flags &= ~FTRACE_EVENT_FL_ENABLED;
+ if (file->flags & FTRACE_EVENT_FL_RECORDED_CMD) {
tracing_stop_cmdline_record();
- call->flags &= ~TRACE_EVENT_FL_RECORDED_CMD;
+ file->flags &= ~FTRACE_EVENT_FL_RECORDED_CMD;
}
- call->class->reg(call, TRACE_REG_UNREGISTER, NULL);
+ call->class->reg(call, TRACE_REG_UNREGISTER, file);
}
break;
case 1:
- if (!(call->flags & TRACE_EVENT_FL_ENABLED)) {
+ if (!(file->flags & FTRACE_EVENT_FL_ENABLED)) {
if (trace_flags & TRACE_ITER_RECORD_CMD) {
tracing_start_cmdline_record();
- call->flags |= TRACE_EVENT_FL_RECORDED_CMD;
+ file->flags |= FTRACE_EVENT_FL_RECORDED_CMD;
}
- ret = call->class->reg(call, TRACE_REG_REGISTER, NULL);
+ 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;
}
- call->flags |= TRACE_EVENT_FL_ENABLED;
+ file->flags |= FTRACE_EVENT_FL_ENABLED;
}
break;
}
return ret;
}
-static void ftrace_clear_events(void)
+static void ftrace_clear_events(struct trace_array *tr)
{
- struct ftrace_event_call *call;
+ 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);
}
if (--system->ref_count)
return;
+ list_del(&system->list);
+
if (filter) {
kfree(filter->filter_string);
kfree(filter);
system->ref_count++;
}
-static void put_system(struct event_subsystem *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(dir->subsystem->ref_count == 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(system);
+ __put_system_dir(dir);
mutex_unlock(&event_mutex);
}
/*
* __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(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 (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(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);
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)
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 ftrace_event_call *call = v;
+ struct ftrace_event_file *file = v;
+ struct ftrace_event_call *call;
+ struct trace_array *tr = m->private;
(*pos)++;
- list_for_each_entry_continue(call, &ftrace_events, 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->class && call->class->reg)
- return call;
+ return file;
}
return NULL;
static void *t_start(struct seq_file *m, loff_t *pos)
{
- struct ftrace_event_call *call;
+ struct ftrace_event_file *file;
+ struct trace_array *tr = m->private;
loff_t l;
mutex_lock(&event_mutex);
- call = list_entry(&ftrace_events, struct ftrace_event_call, list);
+ file = list_entry(&tr->events, struct ftrace_event_file, list);
for (l = 0; l <= *pos; ) {
- call = t_next(m, call, &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 ftrace_event_call *call = v;
+ struct ftrace_event_file *file = v;
+ struct trace_array *tr = m->private;
(*pos)++;
- list_for_each_entry_continue(call, &ftrace_events, list) {
- if (call->flags & TRACE_EVENT_FL_ENABLED)
- return call;
+ list_for_each_entry_continue(file, &tr->events, list) {
+ if (file->flags & FTRACE_EVENT_FL_ENABLED)
+ return file;
}
return NULL;
static void *s_start(struct seq_file *m, loff_t *pos)
{
- struct ftrace_event_call *call;
+ struct ftrace_event_file *file;
+ struct trace_array *tr = m->private;
loff_t l;
mutex_lock(&event_mutex);
- call = list_entry(&ftrace_events, struct ftrace_event_call, list);
+ file = list_entry(&tr->events, struct ftrace_event_file, list);
for (l = 0; l <= *pos; ) {
- call = s_next(m, call, &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->class->system, TRACE_SYSTEM) != 0)
seq_printf(m, "%s:", call->class->system);
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 = filp->private_data;
char *buf;
- if (call->flags & TRACE_EVENT_FL_ENABLED)
+ if (file->flags & FTRACE_EVENT_FL_ENABLED)
buf = "1\n";
else
buf = "0\n";
event_enable_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_file *file = filp->private_data;
unsigned long val;
int ret;
+ if (!file)
+ return -EINVAL;
+
ret = kstrtoul_from_user(ubuf, cnt, 10, &val);
if (ret)
return ret;
case 0:
case 1:
mutex_lock(&event_mutex);
- ret = ftrace_event_enable_disable(call, val);
+ ret = ftrace_event_enable_disable(file, val);
mutex_unlock(&event_mutex);
break;
loff_t *ppos)
{
const char set_to_char[4] = { '?', '0', '1', 'X' };
- struct event_subsystem *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) {
+ list_for_each_entry(file, &tr->events, list) {
+ call = file->event_call;
if (!call->name || !call->class || !call->class->reg)
continue;
* or if all events or cleared, or if we have
* a mixture.
*/
- set |= (1 << !!(call->flags & TRACE_EVENT_FL_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)
{
- struct event_subsystem *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;
ssize_t ret;
if (system)
name = system->name;
- ret = __ftrace_set_clr_event(NULL, name, NULL, val);
+ ret = __ftrace_set_clr_event(dir->tr, NULL, name, NULL, val);
if (ret)
goto out;
static int subsystem_open(struct inode *inode, struct file *filp)
{
struct event_subsystem *system = NULL;
+ struct ftrace_subsystem_dir *dir = NULL; /* Initialize for gcc */
+ struct trace_array *tr;
int ret;
- if (!inode->i_private)
- goto skip_search;
-
/* Make sure the system still exists */
mutex_lock(&event_mutex);
- list_for_each_entry(system, &event_subsystems, list) {
- if (system == inode->i_private) {
- /* Don't open systems with no events */
- if (!system->nr_events) {
- system = NULL;
- break;
+ 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;
}
- __get_system(system);
- break;
}
}
+ exit_loop:
mutex_unlock(&event_mutex);
- if (system != inode->i_private)
+ if (!system)
return -ENODEV;
- skip_search:
+ /* Some versions of gcc think dir can be uninitialized here */
+ WARN_ON(!dir);
+
ret = tracing_open_generic(inode, filp);
- if (ret < 0 && system)
- put_system(system);
+ if (ret < 0)
+ 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;
+
+ /* Make a temporary dir that has no system but points to tr */
+ dir = kzalloc(sizeof(*dir), GFP_KERNEL);
+ if (!dir)
+ return -ENOMEM;
+
+ dir->tr = tr;
+
+ ret = tracing_open_generic(inode, filp);
+ if (ret < 0)
+ kfree(dir);
+
+ filp->private_data = dir;
return ret;
}
static int subsystem_release(struct inode *inode, struct file *file)
{
- struct event_subsystem *system = inode->i_private;
+ struct ftrace_subsystem_dir *dir = file->private_data;
- if (system)
- put_system(system);
+ /*
+ * 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;
}
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;
.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;
-
- if (d_events)
- return d_events;
-
- d_tracer = tracing_init_dentry();
- if (!d_tracer)
- return NULL;
+ struct seq_file *m;
+ int ret;
- d_events = debugfs_create_dir("events", d_tracer);
- if (!d_events)
- pr_warning("Could not create debugfs "
- "'events' directory\n");
+ 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 d_events;
+ return ret;
}
static int
{
const struct seq_operations *seq_ops = &show_event_seq_ops;
- return seq_open(file, 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;
if ((file->f_mode & FMODE_WRITE) &&
(file->f_flags & O_TRUNC))
- ftrace_clear_events();
+ ftrace_clear_events(tr);
- return seq_open(file, seq_ops);
+ return ftrace_event_open(inode, file, seq_ops);
+}
+
+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;
+ system->name = kstrdup(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(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->ref_count = 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);
}
- trace_create_file("enable", 0644, system->entry, system,
+ trace_create_file("enable", 0644, dir->entry, dir,
&ftrace_system_enable_fops);
- return system->entry;
+ 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_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 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->class->system, TRACE_SYSTEM) != 0)
- d_events = event_subsystem_dir(call->class->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->class->reg && !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE))
- trace_create_file("enable", 0644, call->dir, call,
+ trace_create_file("enable", 0644, file->dir, file,
enable);
#ifdef CONFIG_PERF_EVENTS
if (call->event.type && call->class->reg)
- trace_create_file("id", 0444, call->dir, call,
+ trace_create_file("id", 0444, file->dir, call,
id);
#endif
if (ret < 0) {
pr_warning("Could not initialize trace point"
" events/%s\n", call->name);
- return ret;
+ return -1;
}
}
- trace_create_file("filter", 0644, call->dir, call,
+ trace_create_file("filter", 0644, file->dir, call,
filter);
- trace_create_file("format", 0444, call->dir, call,
+ trace_create_file("format", 0444, file->dir, call,
format);
return 0;
}
+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 remove_event_from_tracers(struct ftrace_event_call *call)
+{
+ struct ftrace_event_file *file;
+ struct trace_array *tr;
+
+ do_for_each_event_file_safe(tr, file) {
+
+ if (file->event_call != call)
+ continue;
+
+ list_del(&file->list);
+ debugfs_remove_recursive(file->dir);
+ remove_subsystem(file->system);
+ kfree(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)
{
- ftrace_event_enable_disable(call, 0);
+ 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
-__trace_add_event_call(struct ftrace_event_call *call, struct module *mod,
- const struct file_operations *id,
- const struct file_operations *enable,
- const struct file_operations *filter,
- const struct file_operations *format)
+__register_event(struct ftrace_event_call *call, struct module *mod)
{
- struct dentry *d_events;
int ret;
ret = event_init(call);
if (ret < 0)
return ret;
- d_events = event_trace_events_dir();
- if (!d_events)
- return -ENOENT;
-
- ret = event_create_dir(call, d_events, id, enable, filter, format);
- if (!ret)
- list_add(&call->list, &ftrace_events);
+ list_add(&call->list, &ftrace_events);
call->mod = mod;
- return ret;
+ return 0;
}
+/* 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 = kzalloc(sizeof(*file), GFP_KERNEL);
+ if (!file)
+ return -ENOMEM;
+
+ file->event_call = call;
+ file->tr = tr;
+ list_add(&file->list, &tr->events);
+
+ return event_create_dir(tr->event_dir, file, id, enable, filter, format);
+}
+
+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(&event_mutex);
- ret = __trace_add_event_call(call, NULL, &ftrace_event_id_fops,
- &ftrace_enable_fops,
- &ftrace_event_filter_fops,
- &ftrace_event_format_fops);
- mutex_unlock(&event_mutex);
- return ret;
-}
-static void remove_subsystem_dir(const char *name)
-{
- struct event_subsystem *system;
+ ret = __register_event(call, NULL);
+ if (ret >= 0)
+ __add_event_to_tracers(call, NULL);
- if (strcmp(name, TRACE_SYSTEM) == 0)
- return;
-
- list_for_each_entry(system, &event_subsystems, list) {
- if (strcmp(system->name, name) == 0) {
- if (!--system->nr_events) {
- debugfs_remove_recursive(system->entry);
- list_del(&system->list);
- __put_system(system);
- }
- break;
- }
- }
+ mutex_unlock(&event_mutex);
+ return ret;
}
/*
event_remove(call);
trace_destroy_fields(call);
destroy_preds(call);
- debugfs_remove_recursive(call->dir);
- remove_subsystem_dir(call->class->system);
}
/* Remove an event_call */
struct file_operations filter;
};
+static struct ftrace_module_file_ops *find_ftrace_file_ops(struct module *mod)
+{
+ struct ftrace_module_file_ops *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)
{
return;
for_each_event(call, start, end) {
- __trace_add_event_call(*call, mod,
- &file_ops->id, &file_ops->enable,
- &file_ops->filter, &file_ops->format);
+ __register_event(*call, mod);
+ __add_event_to_tracers(*call, file_ops);
}
}
return 0;
}
#else
+static struct ftrace_module_file_ops *find_ftrace_file_ops(struct module *mod)
+{
+ return NULL;
+}
static int trace_module_notify(struct notifier_block *self,
unsigned long val, void *data)
{
}
#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.
+ *
+ * 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 || call->mod != file_ops->mod)
+ file_ops = find_ftrace_file_ops(call->mod);
+ if (!file_ops)
+ continue; /* Warn? */
+ ret = __trace_add_new_event(call, tr,
+ &file_ops->id, &file_ops->enable,
+ &file_ops->filter, &file_ops->format);
+ 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);
+ }
+}
+
+static void
+__add_event_to_tracers(struct ftrace_event_call *call,
+ struct ftrace_module_file_ops *file_ops)
+{
+ struct trace_array *tr;
+
+ list_for_each_entry(tr, &ftrace_trace_arrays, list) {
+ if (file_ops)
+ __trace_add_new_event(call, tr,
+ &file_ops->id, &file_ops->enable,
+ &file_ops->filter, &file_ops->format);
+ else
+ __trace_add_new_event(call, tr,
+ &ftrace_event_id_fops,
+ &ftrace_enable_fops,
+ &ftrace_event_filter_fops,
+ &ftrace_event_format_fops);
+ }
+}
+
static struct notifier_block trace_module_nb = {
.notifier_call = trace_module_notify,
.priority = 0,
}
__setup("trace_event=", setup_trace_event);
+int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr)
+{
+ struct dentry *d_events;
+ struct dentry *entry;
+
+ 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 = debugfs_create_dir("events", parent);
+ if (!d_events)
+ pr_warning("Could not create debugfs 'events' directory\n");
+
+ /* 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;
+ __trace_add_event_dirs(tr);
+
+ 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;
if (!*token)
continue;
- ret = ftrace_set_clr_event(token, 1);
+ ret = ftrace_set_clr_event(tr, token, 1);
if (ret)
pr_warn("Failed to enable trace event: %s\n", token);
}
static __init int event_trace_init(void)
{
- struct ftrace_event_call *call;
+ struct trace_array *tr;
struct dentry *d_tracer;
struct dentry *entry;
- struct dentry *d_events;
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,
- NULL, &ftrace_avail_fops);
+ tr, &ftrace_avail_fops);
if (!entry)
pr_warning("Could not create debugfs "
"'available_events' entry\n");
- entry = debugfs_create_file("set_event", 0644, d_tracer,
- NULL, &ftrace_set_event_fops);
- if (!entry)
- pr_warning("Could not create debugfs "
- "'set_event' entry\n");
-
- d_events = event_trace_events_dir();
- if (!d_events)
- return 0;
-
- /* 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,
- NULL, &ftrace_system_enable_fops);
-
if (trace_define_common_fields())
pr_warning("tracing: Failed to allocate common fields");
- /*
- * Early initialization already enabled ftrace event.
- * Now it's only necessary to create the event directory.
- */
- list_for_each_entry(call, &ftrace_events, list) {
-
- ret = event_create_dir(call, d_events,
- &ftrace_event_id_fops,
- &ftrace_enable_fops,
- &ftrace_event_filter_fops,
- &ftrace_event_format_fops);
- if (ret < 0)
- event_remove(call);
- }
+ ret = event_trace_add_tracer(d_tracer, tr);
+ if (ret)
+ return ret;
ret = register_module_notifier(&trace_module_nb);
if (ret)
*/
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)
* If an event is already enabled, someone is using
* it and the self test should not be on.
*/
- if (call->flags & TRACE_EVENT_FL_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);
+ 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);
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;
projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / commitdiff