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-rw-r--r--drivers/cpuidle/Kconfig9
-rw-r--r--drivers/cpuidle/cpuidle.c36
-rw-r--r--drivers/cpuidle/cpuidle.h4
-rw-r--r--drivers/cpuidle/driver.c166
-rw-r--r--drivers/cpuidle/sysfs.c174
-rw-r--r--include/linux/cpuidle.h7
6 files changed, 356 insertions, 40 deletions
diff --git a/drivers/cpuidle/Kconfig b/drivers/cpuidle/Kconfig
index a76b689e553b..234ae651b38f 100644
--- a/drivers/cpuidle/Kconfig
+++ b/drivers/cpuidle/Kconfig
@@ -9,6 +9,15 @@ config CPU_IDLE
If you're using an ACPI-enabled platform, you should say Y here.
+config CPU_IDLE_MULTIPLE_DRIVERS
+ bool "Support multiple cpuidle drivers"
+ depends on CPU_IDLE
+ default n
+ help
+ Allows the cpuidle framework to use different drivers for each CPU.
+ This is useful if you have a system with different CPU latencies and
+ states. If unsure say N.
+
config CPU_IDLE_GOV_LADDER
bool
depends on CPU_IDLE
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
index ce4cac706dd1..711dd83fd3ba 100644
--- a/drivers/cpuidle/cpuidle.c
+++ b/drivers/cpuidle/cpuidle.c
@@ -68,7 +68,7 @@ static cpuidle_enter_t cpuidle_enter_ops;
int cpuidle_play_dead(void)
{
struct cpuidle_device *dev = __this_cpu_read(cpuidle_devices);
- struct cpuidle_driver *drv = cpuidle_get_driver();
+ struct cpuidle_driver *drv = cpuidle_get_cpu_driver(dev);
int i, dead_state = -1;
int power_usage = -1;
@@ -128,7 +128,7 @@ int cpuidle_enter_state(struct cpuidle_device *dev, struct cpuidle_driver *drv,
int cpuidle_idle_call(void)
{
struct cpuidle_device *dev = __this_cpu_read(cpuidle_devices);
- struct cpuidle_driver *drv = cpuidle_get_driver();
+ struct cpuidle_driver *drv;
int next_state, entered_state;
if (off)
@@ -141,6 +141,8 @@ int cpuidle_idle_call(void)
if (!dev || !dev->enabled)
return -EBUSY;
+ drv = cpuidle_get_cpu_driver(dev);
+
/* ask the governor for the next state */
next_state = cpuidle_curr_governor->select(drv, dev);
if (need_resched()) {
@@ -312,15 +314,19 @@ static void poll_idle_init(struct cpuidle_driver *drv) {}
int cpuidle_enable_device(struct cpuidle_device *dev)
{
int ret, i;
- struct cpuidle_driver *drv = cpuidle_get_driver();
+ struct cpuidle_driver *drv;
if (!dev)
return -EINVAL;
if (dev->enabled)
return 0;
+
+ drv = cpuidle_get_cpu_driver(dev);
+
if (!drv || !cpuidle_curr_governor)
return -EIO;
+
if (!dev->state_count)
dev->state_count = drv->state_count;
@@ -335,7 +341,8 @@ int cpuidle_enable_device(struct cpuidle_device *dev)
poll_idle_init(drv);
- if ((ret = cpuidle_add_state_sysfs(dev)))
+ ret = cpuidle_add_device_sysfs(dev);
+ if (ret)
return ret;
if (cpuidle_curr_governor->enable &&
@@ -356,7 +363,7 @@ int cpuidle_enable_device(struct cpuidle_device *dev)
return 0;
fail_sysfs:
- cpuidle_remove_state_sysfs(dev);
+ cpuidle_remove_device_sysfs(dev);
return ret;
}
@@ -372,17 +379,20 @@ EXPORT_SYMBOL_GPL(cpuidle_enable_device);
*/
void cpuidle_disable_device(struct cpuidle_device *dev)
{
+ struct cpuidle_driver *drv = cpuidle_get_cpu_driver(dev);
+
if (!dev || !dev->enabled)
return;
- if (!cpuidle_get_driver() || !cpuidle_curr_governor)
+
+ if (!drv || !cpuidle_curr_governor)
return;
dev->enabled = 0;
if (cpuidle_curr_governor->disable)
- cpuidle_curr_governor->disable(cpuidle_get_driver(), dev);
+ cpuidle_curr_governor->disable(drv, dev);
- cpuidle_remove_state_sysfs(dev);
+ cpuidle_remove_device_sysfs(dev);
enabled_devices--;
}
@@ -398,9 +408,9 @@ EXPORT_SYMBOL_GPL(cpuidle_disable_device);
static int __cpuidle_register_device(struct cpuidle_device *dev)
{
int ret;
- struct cpuidle_driver *cpuidle_driver = cpuidle_get_driver();
+ struct cpuidle_driver *drv = cpuidle_get_cpu_driver(dev);
- if (!try_module_get(cpuidle_driver->owner))
+ if (!try_module_get(drv->owner))
return -EINVAL;
per_cpu(cpuidle_devices, dev->cpu) = dev;
@@ -421,7 +431,7 @@ err_coupled:
err_sysfs:
list_del(&dev->device_list);
per_cpu(cpuidle_devices, dev->cpu) = NULL;
- module_put(cpuidle_driver->owner);
+ module_put(drv->owner);
return ret;
}
@@ -460,7 +470,7 @@ EXPORT_SYMBOL_GPL(cpuidle_register_device);
*/
void cpuidle_unregister_device(struct cpuidle_device *dev)
{
- struct cpuidle_driver *cpuidle_driver = cpuidle_get_driver();
+ struct cpuidle_driver *drv = cpuidle_get_cpu_driver(dev);
if (dev->registered == 0)
return;
@@ -477,7 +487,7 @@ void cpuidle_unregister_device(struct cpuidle_device *dev)
cpuidle_resume_and_unlock();
- module_put(cpuidle_driver->owner);
+ module_put(drv->owner);
}
EXPORT_SYMBOL_GPL(cpuidle_unregister_device);
diff --git a/drivers/cpuidle/cpuidle.h b/drivers/cpuidle/cpuidle.h
index f6b0923c2253..ee97e9672ecf 100644
--- a/drivers/cpuidle/cpuidle.h
+++ b/drivers/cpuidle/cpuidle.h
@@ -28,8 +28,8 @@ struct device;
extern int cpuidle_add_interface(struct device *dev);
extern void cpuidle_remove_interface(struct device *dev);
-extern int cpuidle_add_state_sysfs(struct cpuidle_device *device);
-extern void cpuidle_remove_state_sysfs(struct cpuidle_device *device);
+extern int cpuidle_add_device_sysfs(struct cpuidle_device *device);
+extern void cpuidle_remove_device_sysfs(struct cpuidle_device *device);
extern int cpuidle_add_sysfs(struct cpuidle_device *dev);
extern void cpuidle_remove_sysfs(struct cpuidle_device *dev);
diff --git a/drivers/cpuidle/driver.c b/drivers/cpuidle/driver.c
index 8246662f594a..3af841fb397a 100644
--- a/drivers/cpuidle/driver.c
+++ b/drivers/cpuidle/driver.c
@@ -14,9 +14,11 @@
#include "cpuidle.h"
-static struct cpuidle_driver *cpuidle_curr_driver;
DEFINE_SPINLOCK(cpuidle_driver_lock);
+static void __cpuidle_set_cpu_driver(struct cpuidle_driver *drv, int cpu);
+static struct cpuidle_driver * __cpuidle_get_cpu_driver(int cpu);
+
static void set_power_states(struct cpuidle_driver *drv)
{
int i;
@@ -47,12 +49,7 @@ static void __cpuidle_driver_init(struct cpuidle_driver *drv)
set_power_states(drv);
}
-static void cpuidle_set_driver(struct cpuidle_driver *drv)
-{
- cpuidle_curr_driver = drv;
-}
-
-static int __cpuidle_register_driver(struct cpuidle_driver *drv)
+static int __cpuidle_register_driver(struct cpuidle_driver *drv, int cpu)
{
if (!drv || !drv->state_count)
return -EINVAL;
@@ -60,23 +57,84 @@ static int __cpuidle_register_driver(struct cpuidle_driver *drv)
if (cpuidle_disabled())
return -ENODEV;
- if (cpuidle_get_driver())
+ if (__cpuidle_get_cpu_driver(cpu))
return -EBUSY;
__cpuidle_driver_init(drv);
- cpuidle_set_driver(drv);
+ __cpuidle_set_cpu_driver(drv, cpu);
return 0;
}
-static void __cpuidle_unregister_driver(struct cpuidle_driver *drv)
+static void __cpuidle_unregister_driver(struct cpuidle_driver *drv, int cpu)
{
- if (drv != cpuidle_get_driver())
+ if (drv != __cpuidle_get_cpu_driver(cpu))
return;
if (!WARN_ON(drv->refcnt > 0))
- cpuidle_set_driver(NULL);
+ __cpuidle_set_cpu_driver(NULL, cpu);
+}
+
+#ifdef CONFIG_CPU_IDLE_MULTIPLE_DRIVERS
+
+static DEFINE_PER_CPU(struct cpuidle_driver *, cpuidle_drivers);
+
+static void __cpuidle_set_cpu_driver(struct cpuidle_driver *drv, int cpu)
+{
+ per_cpu(cpuidle_drivers, cpu) = drv;
+}
+
+static struct cpuidle_driver *__cpuidle_get_cpu_driver(int cpu)
+{
+ return per_cpu(cpuidle_drivers, cpu);
+}
+
+static void __cpuidle_unregister_all_cpu_driver(struct cpuidle_driver *drv)
+{
+ int cpu;
+ for_each_present_cpu(cpu)
+ __cpuidle_unregister_driver(drv, cpu);
+}
+
+static int __cpuidle_register_all_cpu_driver(struct cpuidle_driver *drv)
+{
+ int ret = 0;
+ int i, cpu;
+
+ for_each_present_cpu(cpu) {
+ ret = __cpuidle_register_driver(drv, cpu);
+ if (ret)
+ break;
+ }
+
+ if (ret)
+ for_each_present_cpu(i) {
+ if (i == cpu)
+ break;
+ __cpuidle_unregister_driver(drv, i);
+ }
+
+
+ return ret;
+}
+
+int cpuidle_register_cpu_driver(struct cpuidle_driver *drv, int cpu)
+{
+ int ret;
+
+ spin_lock(&cpuidle_driver_lock);
+ ret = __cpuidle_register_driver(drv, cpu);
+ spin_unlock(&cpuidle_driver_lock);
+
+ return ret;
+}
+
+void cpuidle_unregister_cpu_driver(struct cpuidle_driver *drv, int cpu)
+{
+ spin_lock(&cpuidle_driver_lock);
+ __cpuidle_unregister_driver(drv, cpu);
+ spin_unlock(&cpuidle_driver_lock);
}
/**
@@ -88,7 +146,7 @@ int cpuidle_register_driver(struct cpuidle_driver *drv)
int ret;
spin_lock(&cpuidle_driver_lock);
- ret = __cpuidle_register_driver(drv);
+ ret = __cpuidle_register_all_cpu_driver(drv);
spin_unlock(&cpuidle_driver_lock);
return ret;
@@ -96,13 +154,48 @@ int cpuidle_register_driver(struct cpuidle_driver *drv)
EXPORT_SYMBOL_GPL(cpuidle_register_driver);
/**
- * cpuidle_get_driver - return the current driver
+ * cpuidle_unregister_driver - unregisters a driver
+ * @drv: the driver
*/
-struct cpuidle_driver *cpuidle_get_driver(void)
+void cpuidle_unregister_driver(struct cpuidle_driver *drv)
+{
+ spin_lock(&cpuidle_driver_lock);
+ __cpuidle_unregister_all_cpu_driver(drv);
+ spin_unlock(&cpuidle_driver_lock);
+}
+EXPORT_SYMBOL_GPL(cpuidle_unregister_driver);
+
+#else
+
+static struct cpuidle_driver *cpuidle_curr_driver;
+
+static inline void __cpuidle_set_cpu_driver(struct cpuidle_driver *drv, int cpu)
+{
+ cpuidle_curr_driver = drv;
+}
+
+static inline struct cpuidle_driver *__cpuidle_get_cpu_driver(int cpu)
{
return cpuidle_curr_driver;
}
-EXPORT_SYMBOL_GPL(cpuidle_get_driver);
+
+/**
+ * cpuidle_register_driver - registers a driver
+ * @drv: the driver
+ */
+int cpuidle_register_driver(struct cpuidle_driver *drv)
+{
+ int ret, cpu;
+
+ cpu = get_cpu();
+ spin_lock(&cpuidle_driver_lock);
+ ret = __cpuidle_register_driver(drv, cpu);
+ spin_unlock(&cpuidle_driver_lock);
+ put_cpu();
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(cpuidle_register_driver);
/**
* cpuidle_unregister_driver - unregisters a driver
@@ -110,11 +203,50 @@ EXPORT_SYMBOL_GPL(cpuidle_get_driver);
*/
void cpuidle_unregister_driver(struct cpuidle_driver *drv)
{
+ int cpu;
+
+ cpu = get_cpu();
spin_lock(&cpuidle_driver_lock);
- __cpuidle_unregister_driver(drv);
+ __cpuidle_unregister_driver(drv, cpu);
spin_unlock(&cpuidle_driver_lock);
+ put_cpu();
}
EXPORT_SYMBOL_GPL(cpuidle_unregister_driver);
+#endif
+
+/**
+ * cpuidle_get_driver - return the current driver
+ */
+struct cpuidle_driver *cpuidle_get_driver(void)
+{
+ struct cpuidle_driver *drv;
+ int cpu;
+
+ cpu = get_cpu();
+ drv = __cpuidle_get_cpu_driver(cpu);
+ put_cpu();
+
+ return drv;
+}
+EXPORT_SYMBOL_GPL(cpuidle_get_driver);
+
+/**
+ * cpuidle_get_cpu_driver - return the driver tied with a cpu
+ */
+struct cpuidle_driver *cpuidle_get_cpu_driver(struct cpuidle_device *dev)
+{
+ struct cpuidle_driver *drv;
+
+ if (!dev)
+ return NULL;
+
+ spin_lock(&cpuidle_driver_lock);
+ drv = __cpuidle_get_cpu_driver(dev->cpu);
+ spin_unlock(&cpuidle_driver_lock);
+
+ return drv;
+}
+EXPORT_SYMBOL_GPL(cpuidle_get_cpu_driver);
struct cpuidle_driver *cpuidle_driver_ref(void)
{
diff --git a/drivers/cpuidle/sysfs.c b/drivers/cpuidle/sysfs.c
index 49b1f4bcc1b3..340942946106 100644
--- a/drivers/cpuidle/sysfs.c
+++ b/drivers/cpuidle/sysfs.c
@@ -364,17 +364,17 @@ static inline void cpuidle_free_state_kobj(struct cpuidle_device *device, int i)
}
/**
- * cpuidle_add_driver_sysfs - adds driver-specific sysfs attributes
+ * cpuidle_add_state_sysfs - adds cpuidle states sysfs attributes
* @device: the target device
*/
-int cpuidle_add_state_sysfs(struct cpuidle_device *device)
+static int cpuidle_add_state_sysfs(struct cpuidle_device *device)
{
int i, ret = -ENOMEM;
struct cpuidle_state_kobj *kobj;
- struct cpuidle_driver *drv = cpuidle_get_driver();
+ struct cpuidle_driver *drv = cpuidle_get_cpu_driver(device);
/* state statistics */
- for (i = 0; i < device->state_count; i++) {
+ for (i = 0; i < drv->state_count; i++) {
kobj = kzalloc(sizeof(struct cpuidle_state_kobj), GFP_KERNEL);
if (!kobj)
goto error_state;
@@ -401,10 +401,10 @@ error_state:
}
/**
- * cpuidle_remove_driver_sysfs - removes driver-specific sysfs attributes
+ * cpuidle_remove_driver_sysfs - removes the cpuidle states sysfs attributes
* @device: the target device
*/
-void cpuidle_remove_state_sysfs(struct cpuidle_device *device)
+static void cpuidle_remove_state_sysfs(struct cpuidle_device *device)
{
int i;
@@ -412,6 +412,168 @@ void cpuidle_remove_state_sysfs(struct cpuidle_device *device)
cpuidle_free_state_kobj(device, i);
}
+#ifdef CONFIG_CPU_IDLE_MULTIPLE_DRIVERS
+#define kobj_to_driver_kobj(k) container_of(k, struct cpuidle_driver_kobj, kobj)
+#define attr_to_driver_attr(a) container_of(a, struct cpuidle_driver_attr, attr)
+
+#define define_one_driver_ro(_name, show) \
+ static struct cpuidle_driver_attr attr_driver_##_name = \
+ __ATTR(_name, 0644, show, NULL)
+
+struct cpuidle_driver_kobj {
+ struct cpuidle_driver *drv;
+ struct completion kobj_unregister;
+ struct kobject kobj;
+};
+
+struct cpuidle_driver_attr {
+ struct attribute attr;
+ ssize_t (*show)(struct cpuidle_driver *, char *);
+ ssize_t (*store)(struct cpuidle_driver *, const char *, size_t);
+};
+
+static ssize_t show_driver_name(struct cpuidle_driver *drv, char *buf)
+{
+ ssize_t ret;
+
+ spin_lock(&cpuidle_driver_lock);
+ ret = sprintf(buf, "%s\n", drv ? drv->name : "none");
+ spin_unlock(&cpuidle_driver_lock);
+
+ return ret;
+}
+
+static void cpuidle_driver_sysfs_release(struct kobject *kobj)
+{
+ struct cpuidle_driver_kobj *driver_kobj = kobj_to_driver_kobj(kobj);
+ complete(&driver_kobj->kobj_unregister);
+}
+
+static ssize_t cpuidle_driver_show(struct kobject *kobj, struct attribute * attr,
+ char * buf)
+{
+ int ret = -EIO;
+ struct cpuidle_driver_kobj *driver_kobj = kobj_to_driver_kobj(kobj);
+ struct cpuidle_driver_attr *dattr = attr_to_driver_attr(attr);
+
+ if (dattr->show)
+ ret = dattr->show(driver_kobj->drv, buf);
+
+ return ret;
+}
+
+static ssize_t cpuidle_driver_store(struct kobject *kobj, struct attribute *attr,
+ const char *buf, size_t size)
+{
+ int ret = -EIO;
+ struct cpuidle_driver_kobj *driver_kobj = kobj_to_driver_kobj(kobj);
+ struct cpuidle_driver_attr *dattr = attr_to_driver_attr(attr);
+
+ if (dattr->store)
+ ret = dattr->store(driver_kobj->drv, buf, size);
+
+ return ret;
+}
+
+define_one_driver_ro(name, show_driver_name);
+
+static const struct sysfs_ops cpuidle_driver_sysfs_ops = {
+ .show = cpuidle_driver_show,
+ .store = cpuidle_driver_store,
+};
+
+static struct attribute *cpuidle_driver_default_attrs[] = {
+ &attr_driver_name.attr,
+ NULL
+};
+
+static struct kobj_type ktype_driver_cpuidle = {
+ .sysfs_ops = &cpuidle_driver_sysfs_ops,
+ .default_attrs = cpuidle_driver_default_attrs,
+ .release = cpuidle_driver_sysfs_release,
+};
+
+/**
+ * cpuidle_add_driver_sysfs - adds the driver name sysfs attribute
+ * @device: the target device
+ */
+static int cpuidle_add_driver_sysfs(struct cpuidle_device *dev)
+{
+ struct cpuidle_driver_kobj *kdrv;
+ struct cpuidle_driver *drv = cpuidle_get_cpu_driver(dev);
+ int ret;
+
+ kdrv = kzalloc(sizeof(*kdrv), GFP_KERNEL);
+ if (!kdrv)
+ return -ENOMEM;
+
+ kdrv->drv = drv;
+ init_completion(&kdrv->kobj_unregister);
+
+ ret = kobject_init_and_add(&kdrv->kobj, &ktype_driver_cpuidle,
+ &dev->kobj, "driver");
+ if (ret) {
+ kfree(kdrv);
+ return ret;
+ }
+
+ kobject_uevent(&kdrv->kobj, KOBJ_ADD);
+ dev->kobj_driver = kdrv;
+
+ return ret;
+}
+
+/**
+ * cpuidle_remove_driver_sysfs - removes the driver name sysfs attribute
+ * @device: the target device
+ */
+static void cpuidle_remove_driver_sysfs(struct cpuidle_device *dev)
+{
+ struct cpuidle_driver_kobj *kdrv = dev->kobj_driver;
+ kobject_put(&kdrv->kobj);
+ wait_for_completion(&kdrv->kobj_unregister);
+ kfree(kdrv);
+}
+#else
+static inline int cpuidle_add_driver_sysfs(struct cpuidle_device *dev)
+{
+ return 0;
+}
+
+static inline void cpuidle_remove_driver_sysfs(struct cpuidle_device *dev)
+{
+ ;
+}
+#endif
+
+/**
+ * cpuidle_add_device_sysfs - adds device specific sysfs attributes
+ * @device: the target device
+ */
+int cpuidle_add_device_sysfs(struct cpuidle_device *device)
+{
+ int ret;
+
+ ret = cpuidle_add_state_sysfs(device);
+ if (ret)
+ return ret;
+
+ ret = cpuidle_add_driver_sysfs(device);
+ if (ret)
+ cpuidle_remove_state_sysfs(device);
+ return ret;
+}
+
+/**
+ * cpuidle_remove_device_sysfs : removes device specific sysfs attributes
+ * @device : the target device
+ */
+void cpuidle_remove_device_sysfs(struct cpuidle_device *device)
+{
+ cpuidle_remove_driver_sysfs(device);
+ cpuidle_remove_state_sysfs(device);
+}
+
/**
* cpuidle_add_sysfs - creates a sysfs instance for the target device
* @dev: the target device
diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h
index d08e1afa4919..3711b34dc4f9 100644
--- a/include/linux/cpuidle.h
+++ b/include/linux/cpuidle.h
@@ -91,7 +91,7 @@ struct cpuidle_device {
int state_count;
struct cpuidle_state_usage states_usage[CPUIDLE_STATE_MAX];
struct cpuidle_state_kobj *kobjs[CPUIDLE_STATE_MAX];
-
+ struct cpuidle_driver_kobj *kobj_driver;
struct list_head device_list;
struct kobject kobj;
struct completion kobj_unregister;
@@ -157,6 +157,10 @@ extern int cpuidle_wrap_enter(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int index));
extern int cpuidle_play_dead(void);
+extern struct cpuidle_driver *cpuidle_get_cpu_driver(struct cpuidle_device *dev);
+extern int cpuidle_register_cpu_driver(struct cpuidle_driver *drv, int cpu);
+extern void cpuidle_unregister_cpu_driver(struct cpuidle_driver *drv, int cpu);
+
#else
static inline void disable_cpuidle(void) { }
static inline int cpuidle_idle_call(void) { return -ENODEV; }
@@ -183,7 +187,6 @@ static inline int cpuidle_wrap_enter(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int index))
{ return -ENODEV; }
static inline int cpuidle_play_dead(void) {return -ENODEV; }
-
#endif
#ifdef CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-27 12:50:21 +0000