#include "trace_output.h"
+#include <linux/mtk_ftrace.h>
+
#undef TRACE_SYSTEM
#define TRACE_SYSTEM "TRACE_SYSTEM"
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 ret = 0;
int disable;
+ if(call->name && ((file->flags & FTRACE_EVENT_FL_ENABLED) ^ enable))
+ printk(KERN_INFO "[ftrace]event '%s' is %s\n", call->name, enable?"enabled":"disabled");
+
switch (enable) {
case 0:
/*
mutex_unlock(&event_mutex);
}
-static void *event_file_data(struct file *filp)
+static void remove_subsystem(struct ftrace_subsystem_dir *dir)
{
- return ACCESS_ONCE(file_inode(filp)->i_private);
+ if (!dir)
+ return;
+
+ if (!--dir->nr_events) {
+ debugfs_remove_recursive(dir->entry);
+ list_del(&dir->list);
+ __put_system_dir(dir);
+ }
}
-/*
- * Open and update trace_array ref count.
- * Must have the current trace_array passed to it.
- */
-static int tracing_open_generic_file(struct inode *inode, struct file *filp)
+static void *event_file_data(struct file *filp)
{
- struct ftrace_event_file *file = inode->i_private;
- struct trace_array *tr = file->tr;
- int ret;
-
- if (trace_array_get(tr) < 0)
- return -ENODEV;
-
- ret = tracing_open_generic(inode, filp);
- if (ret < 0)
- trace_array_put(tr);
- return ret;
+ return ACCESS_ONCE(file_inode(filp)->i_private);
}
-static int tracing_release_generic_file(struct inode *inode, struct file *filp)
+static void remove_event_file_dir(struct ftrace_event_file *file)
{
- struct ftrace_event_file *file = inode->i_private;
- struct trace_array *tr = file->tr;
+ struct dentry *dir = file->dir;
+ struct dentry *child;
- trace_array_put(tr);
+ if (dir) {
+ spin_lock(&dir->d_lock); /* probably unneeded */
+ list_for_each_entry(child, &dir->d_subdirs, d_child) {
+ if (child->d_inode) /* probably unneeded */
+ child->d_inode->i_private = NULL;
+ }
+ spin_unlock(&dir->d_lock);
- return 0;
+ debugfs_remove_recursive(dir);
+ }
+
+ list_del(&file->list);
+ remove_subsystem(file->system);
+ kmem_cache_free(file_cachep, file);
}
/*
static void *f_next(struct seq_file *m, void *v, loff_t *pos)
{
- struct ftrace_event_call *call = m->private;
+ 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);
loff_t l = 0;
void *p;
+ /* ->stop() is called even if ->start() fails */
+ mutex_lock(&event_mutex);
+ if (!event_file_data(m->private))
+ return ERR_PTR(-ENODEV);
+
/* Start by showing the header */
if (!*pos)
return (void *)FORMAT_HEADER;
static int f_show(struct seq_file *m, void *v)
{
- struct ftrace_event_call *call = m->private;
+ struct ftrace_event_call *call = event_file_data(m->private);
struct ftrace_event_field *field;
const char *array_descriptor;
static void f_stop(struct seq_file *m, void *p)
{
+ mutex_unlock(&event_mutex);
}
static const struct seq_operations trace_format_seq_ops = {
static int trace_format_open(struct inode *inode, struct file *file)
{
- struct ftrace_event_call *call = inode->i_private;
struct seq_file *m;
int ret;
return ret;
m = file->private_data;
- m->private = call;
+ m->private = file;
return 0;
}
};
static const struct file_operations ftrace_enable_fops = {
- .open = tracing_open_generic_file,
+ .open = tracing_open_generic,
.read = event_enable_read,
.write = event_enable_write,
- .release = tracing_release_generic_file,
.llseek = default_llseek,
};
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);
- kmem_cache_free(file_cachep, file);
-
+ remove_event_file_dir(file);
/*
* The do_for_each_event_file_safe() is
* a double loop. After finding the call for this
destroy_preds(call);
}
+static int probe_remove_event_call(struct ftrace_event_call *call)
+{
+ struct trace_array *tr;
+ struct ftrace_event_file *file;
+
+#ifdef CONFIG_PERF_EVENTS
+ if (call->perf_refcount)
+ return -EBUSY;
+#endif
+ do_for_each_event_file(tr, file) {
+ if (file->event_call != call)
+ continue;
+ /*
+ * We can't rely on ftrace_event_enable_disable(enable => 0)
+ * we are going to do, FTRACE_EVENT_FL_SOFT_MODE can suppress
+ * TRACE_REG_UNREGISTER.
+ */
+ if (file->flags & FTRACE_EVENT_FL_ENABLED)
+ return -EBUSY;
+ break;
+ } while_for_each_event_file();
+
+ __trace_remove_event_call(call);
+
+ return 0;
+}
+
/* Remove an event_call */
-void trace_remove_event_call(struct ftrace_event_call *call)
+int trace_remove_event_call(struct ftrace_event_call *call)
{
+ int ret;
+
mutex_lock(&trace_types_lock);
mutex_lock(&event_mutex);
down_write(&trace_event_sem);
- __trace_remove_event_call(call);
+ ret = probe_remove_event_call(call);
up_write(&trace_event_sem);
mutex_unlock(&event_mutex);
mutex_unlock(&trace_types_lock);
+
+ return ret;
}
#define for_each_event(event, start, end) \
struct ftrace_module_file_ops *file_ops = NULL;
struct ftrace_event_call **call, **start, **end;
+ if (!mod->num_trace_events)
+ return;
+
+ /* Don't add infrastructure for mods without tracepoints */
+ if (trace_module_has_bad_taint(mod)) {
+ pr_err("%s: module has bad taint, not creating trace events\n",
+ mod->name);
+ return;
+ }
+
start = mod->trace_events;
end = mod->trace_events + mod->num_trace_events;
{
struct ftrace_event_file *file, *next;
- list_for_each_entry_safe(file, next, &tr->events, list) {
- list_del(&file->list);
- debugfs_remove_recursive(file->dir);
- remove_subsystem(file->system);
- kmem_cache_free(file_cachep, file);
- }
+ list_for_each_entry_safe(file, next, &tr->events, list)
+ remove_event_file_dir(file);
}
static void
}
__setup("trace_event=", setup_trace_event);
+#ifdef CONFIG_MTK_SCHED_TRACERS
+// collect boot time ftrace, disabled by default
+static int boot_time_ftrace = 0;
+
+static __init int setup_boot_time_ftrace(char *str)
+{
+ boot_time_ftrace = 1;
+ return 1;
+}
+__setup("boot_time_ftrace", setup_boot_time_ftrace);
+
+#ifdef CONFIG_MTK_FTRACE_DEFAULT_ENABLE
+
+// delay the ring buffer expand until lat_initcall stage
+// to avoid impacting the boot time
+static __init int expand_ring_buffer_init(void){
+ if(!boot_time_ftrace)
+ tracing_update_buffers();
+ return 0;
+}
+late_initcall(expand_ring_buffer_init);
+
+#endif /* CONFIG_MTK_FTRACE_DEFAULT_ENABLE */
+#endif /* CONFIG_MTK_SCHED_TRACERS */
+
/* Expects to have event_mutex held when called */
static int
create_event_toplevel_files(struct dentry *parent, struct trace_array *tr)
if (ret)
return ret;
+#ifdef CONFIG_MTK_FTRACE_DEFAULT_ENABLE
+ // enable ftrace facilities
+ mt_ftrace_enable_disable(1);
+
+ // only update buffer eariler if we want to collect boot-time ftrace
+ // to avoid the boot time impacted by early-expanded ring buffer
+ if(boot_time_ftrace)
+ tracing_update_buffers();
+ else
+ set_tracer_flag(tr, TRACE_ITER_OVERWRITE, 1);
+ printk(KERN_INFO "[ftrace]ftrace ready...\n");
+#endif
+
ret = register_module_notifier(&trace_module_nb);
if (ret)
pr_warning("Failed to register trace events module notifier\n");
projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blobdiff