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Commit 9ec7684c authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

Merge branch 'cpuidle-gen' into pm-cpuidle 

* cpuidle-gen:
  cpuidle: Check if device is already registered
  cpuidle: Introduce __cpuidle_device_init()
  cpuidle: Introduce __cpuidle_unregister_device()
  cpuidle: Add missing forward declarations of structures
  cpuidle: Make cpuidle's sysfs directory dynamically allocated
  cpuidle: Fix white space to follow CodingStyle
  cpuidle: Check cpuidle_enable_device() return value
  cpuidle: Make it clear that governors cannot be modules
parents 3b2f64d0 c878a52d

drivers/cpuidle/cpuidle.c

+53 −41
Original line number Diff line number Diff line
@@ -42,8 +42,6 @@ void disable_cpuidle(void) 
	off = 1;

}



static int __cpuidle_register_device(struct cpuidle_device *dev);



/**

 * cpuidle_play_dead - cpu off-lining

 *
@@ -278,7 +276,7 @@ static void poll_idle_init(struct cpuidle_driver *drv) {} 
 */

int cpuidle_enable_device(struct cpuidle_device *dev)

{

	int ret, i;

	int ret;

	struct cpuidle_driver *drv;



	if (!dev)
@@ -292,15 +290,12 @@ int cpuidle_enable_device(struct cpuidle_device *dev) 
	if (!drv || !cpuidle_curr_governor)

		return -EIO;



	if (!dev->registered)

		return -EINVAL;



	if (!dev->state_count)

		dev->state_count = drv->state_count;



	if (dev->registered == 0) {

		ret = __cpuidle_register_device(dev);

		if (ret)

			return ret;

	}



	poll_idle_init(drv);



	ret = cpuidle_add_device_sysfs(dev);
@@ -311,12 +306,6 @@ int cpuidle_enable_device(struct cpuidle_device *dev) 
	    (ret = cpuidle_curr_governor->enable(drv, dev)))

		goto fail_sysfs;



	for (i = 0; i < dev->state_count; i++) {

		dev->states_usage[i].usage = 0;

		dev->states_usage[i].time = 0;

	}

	dev->last_residency = 0;



	smp_wmb();



	dev->enabled = 1;
@@ -360,6 +349,23 @@ void cpuidle_disable_device(struct cpuidle_device *dev) 


EXPORT_SYMBOL_GPL(cpuidle_disable_device);



static void __cpuidle_unregister_device(struct cpuidle_device *dev)

{

	struct cpuidle_driver *drv = cpuidle_get_cpu_driver(dev);



	list_del(&dev->device_list);

	per_cpu(cpuidle_devices, dev->cpu) = NULL;

	module_put(drv->owner);

}



static int __cpuidle_device_init(struct cpuidle_device *dev)

{

	memset(dev->states_usage, 0, sizeof(dev->states_usage));

	dev->last_residency = 0;



	return 0;

}



/**

 * __cpuidle_register_device - internal register function called before register

 * and enable routines
@@ -377,24 +383,15 @@ static int __cpuidle_register_device(struct cpuidle_device *dev) 


	per_cpu(cpuidle_devices, dev->cpu) = dev;

	list_add(&dev->device_list, &cpuidle_detected_devices);

	ret = cpuidle_add_sysfs(dev);

	if (ret)

		goto err_sysfs;



	ret = cpuidle_coupled_register_device(dev);

	if (ret)

		goto err_coupled;

	if (ret) {

		__cpuidle_unregister_device(dev);

		return ret;

	}



	dev->registered = 1;

	return 0;



err_coupled:

	cpuidle_remove_sysfs(dev);

err_sysfs:

	list_del(&dev->device_list);

	per_cpu(cpuidle_devices, dev->cpu) = NULL;

	module_put(drv->owner);

	return ret;

}



/**
@@ -403,25 +400,44 @@ static int __cpuidle_register_device(struct cpuidle_device *dev) 
 */

int cpuidle_register_device(struct cpuidle_device *dev)

{

	int ret;

	int ret = -EBUSY;



	if (!dev)

		return -EINVAL;



	mutex_lock(&cpuidle_lock);



	if ((ret = __cpuidle_register_device(dev))) {

		mutex_unlock(&cpuidle_lock);

		return ret;

	}

	if (dev->registered)

		goto out_unlock;



	ret = __cpuidle_device_init(dev);

	if (ret)

		goto out_unlock;



	ret = __cpuidle_register_device(dev);

	if (ret)

		goto out_unlock;



	ret = cpuidle_add_sysfs(dev);

	if (ret)

		goto out_unregister;



	ret = cpuidle_enable_device(dev);

	if (ret)

		goto out_sysfs;



	cpuidle_enable_device(dev);

	cpuidle_install_idle_handler();



out_unlock:

	mutex_unlock(&cpuidle_lock);



	return 0;

	return ret;



out_sysfs:

	cpuidle_remove_sysfs(dev);

out_unregister:

	__cpuidle_unregister_device(dev);

	goto out_unlock;

}



EXPORT_SYMBOL_GPL(cpuidle_register_device);
@@ -432,8 +448,6 @@ EXPORT_SYMBOL_GPL(cpuidle_register_device); 
 */

void cpuidle_unregister_device(struct cpuidle_device *dev)

{

	struct cpuidle_driver *drv = cpuidle_get_cpu_driver(dev);



	if (dev->registered == 0)

		return;
@@ -442,14 +456,12 @@ void cpuidle_unregister_device(struct cpuidle_device *dev) 
	cpuidle_disable_device(dev);



	cpuidle_remove_sysfs(dev);

	list_del(&dev->device_list);

	per_cpu(cpuidle_devices, dev->cpu) = NULL;



	__cpuidle_unregister_device(dev);



	cpuidle_coupled_unregister_device(dev);



	cpuidle_resume_and_unlock();



	module_put(drv->owner);

}



EXPORT_SYMBOL_GPL(cpuidle_unregister_device);

drivers/cpuidle/governors/ladder.c

+1 −11
Original line number Diff line number Diff line
@@ -192,14 +192,4 @@ static int __init init_ladder(void) 
	return cpuidle_register_governor(&ladder_governor);

}



/**

 * exit_ladder - exits the governor

 */

static void __exit exit_ladder(void)

{

	cpuidle_unregister_governor(&ladder_governor);

}



MODULE_LICENSE("GPL");

module_init(init_ladder);

module_exit(exit_ladder);
 
postcore_initcall(init_ladder);

drivers/cpuidle/governors/menu.c

+1 −11
Original line number Diff line number Diff line
@@ -540,14 +540,4 @@ static int __init init_menu(void) 
	return cpuidle_register_governor(&menu_governor);

}



/**

 * exit_menu - exits the governor

 */

static void __exit exit_menu(void)

{

	cpuidle_unregister_governor(&menu_governor);

}



MODULE_LICENSE("GPL");

module_init(init_menu);

module_exit(exit_menu);
 
postcore_initcall(init_menu);

drivers/cpuidle/sysfs.c

+70 −31
Original line number Diff line number Diff line
@@ -11,8 +11,10 @@ 
#include <linux/sysfs.h>

#include <linux/slab.h>

#include <linux/cpu.h>

#include <linux/completion.h>

#include <linux/capability.h>

#include <linux/device.h>

#include <linux/kobject.h>



#include "cpuidle.h"
@@ -33,7 +35,8 @@ static ssize_t show_available_governors(struct device *dev, 


	mutex_lock(&cpuidle_lock);

	list_for_each_entry(tmp, &cpuidle_governors, governor_list) {

		if (i >= (ssize_t) ((PAGE_SIZE/sizeof(char)) - CPUIDLE_NAME_LEN - 2))

		if (i >= (ssize_t) ((PAGE_SIZE/sizeof(char)) -

				    CPUIDLE_NAME_LEN - 2))

			goto out;

		i += scnprintf(&buf[i], CPUIDLE_NAME_LEN, "%s ", tmp->name);

	}
@@ -166,12 +169,27 @@ struct cpuidle_attr { 
#define define_one_rw(_name, show, store) \

	static struct cpuidle_attr attr_##_name = __ATTR(_name, 0644, show, store)



#define kobj_to_cpuidledev(k) container_of(k, struct cpuidle_device, kobj)

#define attr_to_cpuidleattr(a) container_of(a, struct cpuidle_attr, attr)

static ssize_t cpuidle_show(struct kobject * kobj, struct attribute * attr ,char * buf)



struct cpuidle_device_kobj {

	struct cpuidle_device *dev;

	struct completion kobj_unregister;

	struct kobject kobj;

};



static inline struct cpuidle_device *to_cpuidle_device(struct kobject *kobj)

{

	struct cpuidle_device_kobj *kdev =

		container_of(kobj, struct cpuidle_device_kobj, kobj);



	return kdev->dev;

}



static ssize_t cpuidle_show(struct kobject *kobj, struct attribute *attr,

			    char *buf)

{

	int ret = -EIO;

	struct cpuidle_device *dev = kobj_to_cpuidledev(kobj);

	struct cpuidle_device *dev = to_cpuidle_device(kobj);

	struct cpuidle_attr *cattr = attr_to_cpuidleattr(attr);



	if (cattr->show) {
@@ -186,7 +204,7 @@ static ssize_t cpuidle_store(struct kobject * kobj, struct attribute * attr, 
			     const char *buf, size_t count)

{

	int ret = -EIO;

	struct cpuidle_device *dev = kobj_to_cpuidledev(kobj);

	struct cpuidle_device *dev = to_cpuidle_device(kobj);

	struct cpuidle_attr *cattr = attr_to_cpuidleattr(attr);



	if (cattr->store) {
@@ -204,9 +222,10 @@ static const struct sysfs_ops cpuidle_sysfs_ops = { 


static void cpuidle_sysfs_release(struct kobject *kobj)

{

	struct cpuidle_device *dev = kobj_to_cpuidledev(kobj);

	struct cpuidle_device_kobj *kdev =

		container_of(kobj, struct cpuidle_device_kobj, kobj);



	complete(&dev->kobj_unregister);

	complete(&kdev->kobj_unregister);

}



static struct kobj_type ktype_cpuidle = {
@@ -256,14 +275,16 @@ static ssize_t store_state_##_name(struct cpuidle_state *state, \ 


#define define_show_state_ull_function(_name) \

static ssize_t show_state_##_name(struct cpuidle_state *state, \

			struct cpuidle_state_usage *state_usage, char *buf) \

				  struct cpuidle_state_usage *state_usage, \

				  char *buf)				\

{ \

	return sprintf(buf, "%llu\n", state_usage->_name);\

}



#define define_show_state_str_function(_name) \

static ssize_t show_state_##_name(struct cpuidle_state *state, \

			struct cpuidle_state_usage *state_usage, char *buf) \

				  struct cpuidle_state_usage *state_usage, \

				  char *buf)				\

{ \

	if (state->_name[0] == '\0')\

		return sprintf(buf, "<null>\n");\
@@ -309,8 +330,9 @@ struct cpuidle_state_kobj { 
#define kobj_to_state(k) (kobj_to_state_obj(k)->state)

#define kobj_to_state_usage(k) (kobj_to_state_obj(k)->state_usage)

#define attr_to_stateattr(a) container_of(a, struct cpuidle_state_attr, attr)

static ssize_t cpuidle_state_show(struct kobject * kobj,

	struct attribute * attr ,char * buf)



static ssize_t cpuidle_state_show(struct kobject *kobj, struct attribute *attr,

				  char * buf)

{

	int ret = -EIO;

	struct cpuidle_state *state = kobj_to_state(kobj);
@@ -323,8 +345,8 @@ static ssize_t cpuidle_state_show(struct kobject * kobj, 
	return ret;

}



static ssize_t cpuidle_state_store(struct kobject *kobj,

	struct attribute *attr, const char *buf, size_t size)

static ssize_t cpuidle_state_store(struct kobject *kobj, struct attribute *attr,

				   const char *buf, size_t size)

{

	int ret = -EIO;

	struct cpuidle_state *state = kobj_to_state(kobj);
@@ -371,6 +393,7 @@ static int cpuidle_add_state_sysfs(struct cpuidle_device *device) 
{

	int i, ret = -ENOMEM;

	struct cpuidle_state_kobj *kobj;

	struct cpuidle_device_kobj *kdev = device->kobj_dev;

	struct cpuidle_driver *drv = cpuidle_get_cpu_driver(device);



	/* state statistics */
@@ -383,7 +406,7 @@ static int cpuidle_add_state_sysfs(struct cpuidle_device *device) 
		init_completion(&kobj->kobj_unregister);



		ret = kobject_init_and_add(&kobj->kobj, &ktype_state_cpuidle,

					   &device->kobj, "state%d", i);

					   &kdev->kobj, "state%d", i);

		if (ret) {

			kfree(kobj);

			goto error_state;
@@ -500,6 +523,7 @@ static struct kobj_type ktype_driver_cpuidle = { 
static int cpuidle_add_driver_sysfs(struct cpuidle_device *dev)

{

	struct cpuidle_driver_kobj *kdrv;

	struct cpuidle_device_kobj *kdev = dev->kobj_dev;

	struct cpuidle_driver *drv = cpuidle_get_cpu_driver(dev);

	int ret;
@@ -511,7 +535,7 @@ static int cpuidle_add_driver_sysfs(struct cpuidle_device *dev) 
	init_completion(&kdrv->kobj_unregister);



	ret = kobject_init_and_add(&kdrv->kobj, &ktype_driver_cpuidle,

				   &dev->kobj, "driver");

				   &kdev->kobj, "driver");

	if (ret) {

		kfree(kdrv);

		return ret;
@@ -580,24 +604,39 @@ void cpuidle_remove_device_sysfs(struct cpuidle_device *device) 
 */

int cpuidle_add_sysfs(struct cpuidle_device *dev)

{

	struct cpuidle_device_kobj *kdev;

	struct device *cpu_dev = get_cpu_device((unsigned long)dev->cpu);

	int error;



	init_completion(&dev->kobj_unregister);

	kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);

	if (!kdev)

		return -ENOMEM;

	kdev->dev = dev;

	dev->kobj_dev = kdev;



	init_completion(&kdev->kobj_unregister);



	error = kobject_init_and_add(&dev->kobj, &ktype_cpuidle, &cpu_dev->kobj,

	error = kobject_init_and_add(&kdev->kobj, &ktype_cpuidle, &cpu_dev->kobj,

				   "cpuidle");

	if (!error)

		kobject_uevent(&dev->kobj, KOBJ_ADD);

	if (error) {

		kfree(kdev);

		return error;

	}



	kobject_uevent(&kdev->kobj, KOBJ_ADD);



	return 0;

}



/**

 * cpuidle_remove_sysfs - deletes a sysfs instance on the target device

 * @dev: the target device

 */

void cpuidle_remove_sysfs(struct cpuidle_device *dev)

{

	kobject_put(&dev->kobj);

	wait_for_completion(&dev->kobj_unregister);

	struct cpuidle_device_kobj *kdev = dev->kobj_dev;



	kobject_put(&kdev->kobj);

	wait_for_completion(&kdev->kobj_unregister);

	kfree(kdev);

}

include/linux/cpuidle.h

+5 −4
Original line number Diff line number Diff line
@@ -13,8 +13,6 @@ 


#include <linux/percpu.h>

#include <linux/list.h>

#include <linux/kobject.h>

#include <linux/completion.h>

#include <linux/hrtimer.h>



#define CPUIDLE_STATE_MAX	10
@@ -61,6 +59,10 @@ struct cpuidle_state { 


#define CPUIDLE_DRIVER_FLAGS_MASK (0xFFFF0000)



struct cpuidle_device_kobj;

struct cpuidle_state_kobj;

struct cpuidle_driver_kobj;



struct cpuidle_device {

	unsigned int		registered:1;

	unsigned int		enabled:1;
@@ -71,9 +73,8 @@ struct cpuidle_device { 
	struct cpuidle_state_usage	states_usage[CPUIDLE_STATE_MAX];

	struct cpuidle_state_kobj *kobjs[CPUIDLE_STATE_MAX];

	struct cpuidle_driver_kobj *kobj_driver;

	struct cpuidle_device_kobj *kobj_dev;

	struct list_head 	device_list;

	struct kobject		kobj;

	struct completion	kobj_unregister;



#ifdef CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED

	int			safe_state_index;