90 lines
2.2 KiB
C
Executable file
90 lines
2.2 KiB
C
Executable file
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* This code maintains a list of active profiling data structures.
|
|
*
|
|
* Copyright IBM Corp. 2009
|
|
* Author(s): Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
|
|
*
|
|
* Uses gcc-internal data definitions.
|
|
* Based on the gcov-kernel patch by:
|
|
* Hubertus Franke <frankeh@us.ibm.com>
|
|
* Nigel Hinds <nhinds@us.ibm.com>
|
|
* Rajan Ravindran <rajancr@us.ibm.com>
|
|
* Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
|
|
* Paul Larson
|
|
*/
|
|
|
|
#define pr_fmt(fmt) "gcov: " fmt
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/sched.h>
|
|
#include "gcov.h"
|
|
|
|
int gcov_events_enabled;
|
|
DEFINE_MUTEX(gcov_lock);
|
|
|
|
/**
|
|
* gcov_enable_events - enable event reporting through gcov_event()
|
|
*
|
|
* Turn on reporting of profiling data load/unload-events through the
|
|
* gcov_event() callback. Also replay all previous events once. This function
|
|
* is needed because some events are potentially generated too early for the
|
|
* callback implementation to handle them initially.
|
|
*/
|
|
void gcov_enable_events(void)
|
|
{
|
|
struct gcov_info *info = NULL;
|
|
|
|
mutex_lock(&gcov_lock);
|
|
gcov_events_enabled = 1;
|
|
|
|
/* Perform event callback for previously registered entries. */
|
|
while ((info = gcov_info_next(info))) {
|
|
gcov_event(GCOV_ADD, info);
|
|
cond_resched();
|
|
}
|
|
|
|
mutex_unlock(&gcov_lock);
|
|
}
|
|
|
|
#ifdef CONFIG_MODULES
|
|
/* Update list and generate events when modules are unloaded. */
|
|
static int gcov_module_notifier(struct notifier_block *nb, unsigned long event,
|
|
void *data)
|
|
{
|
|
struct module *mod = data;
|
|
struct gcov_info *info = NULL;
|
|
struct gcov_info *prev = NULL;
|
|
|
|
if (event != MODULE_STATE_GOING)
|
|
return NOTIFY_OK;
|
|
mutex_lock(&gcov_lock);
|
|
|
|
/* Remove entries located in module from linked list. */
|
|
while ((info = gcov_info_next(info))) {
|
|
if (gcov_info_within_module(info, mod)) {
|
|
gcov_info_unlink(prev, info);
|
|
if (gcov_events_enabled)
|
|
gcov_event(GCOV_REMOVE, info);
|
|
} else
|
|
prev = info;
|
|
}
|
|
|
|
mutex_unlock(&gcov_lock);
|
|
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
static struct notifier_block gcov_nb = {
|
|
.notifier_call = gcov_module_notifier,
|
|
};
|
|
|
|
static int __init gcov_init(void)
|
|
{
|
|
return register_module_notifier(&gcov_nb);
|
|
}
|
|
device_initcall(gcov_init);
|
|
#endif /* CONFIG_MODULES */
|