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linux-next/drivers/cpuidle/cpuidle.h
Joao Martins cb5d8c45ab cpuidle: allow governor switch on cpuidle_register_driver()
The recently introduced haltpoll driver is largely only useful with
haltpoll governor. To allow drivers to associate with a particular idle
behaviour, add a @governor property to 'struct cpuidle_driver' and thus
allow a cpuidle driver to switch to a *preferred* governor on idle driver
registration. We save the previous governor, and when an idle driver is
unregistered we switch back to that.

The @governor can be overridden by cpuidle.governor= boot param or
alternatively be ignored if the governor doesn't exist.

Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2019-09-11 17:36:30 +02:00

76 lines
2.2 KiB
C

/* SPDX-License-Identifier: GPL-2.0 */
/*
* cpuidle.h - The internal header file
*/
#ifndef __DRIVER_CPUIDLE_H
#define __DRIVER_CPUIDLE_H
/* For internal use only */
extern char param_governor[];
extern struct cpuidle_governor *cpuidle_curr_governor;
extern struct cpuidle_governor *cpuidle_prev_governor;
extern struct list_head cpuidle_governors;
extern struct list_head cpuidle_detected_devices;
extern struct mutex cpuidle_lock;
extern spinlock_t cpuidle_driver_lock;
extern int cpuidle_disabled(void);
extern int cpuidle_enter_state(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int next_state);
/* idle loop */
extern void cpuidle_install_idle_handler(void);
extern void cpuidle_uninstall_idle_handler(void);
/* governors */
extern struct cpuidle_governor *cpuidle_find_governor(const char *str);
extern int cpuidle_switch_governor(struct cpuidle_governor *gov);
/* sysfs */
struct device;
extern int cpuidle_add_interface(struct device *dev);
extern void cpuidle_remove_interface(struct device *dev);
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);
#ifdef CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED
bool cpuidle_state_is_coupled(struct cpuidle_driver *drv, int state);
int cpuidle_coupled_state_verify(struct cpuidle_driver *drv);
int cpuidle_enter_state_coupled(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int next_state);
int cpuidle_coupled_register_device(struct cpuidle_device *dev);
void cpuidle_coupled_unregister_device(struct cpuidle_device *dev);
#else
static inline
bool cpuidle_state_is_coupled(struct cpuidle_driver *drv, int state)
{
return false;
}
static inline int cpuidle_coupled_state_verify(struct cpuidle_driver *drv)
{
return 0;
}
static inline int cpuidle_enter_state_coupled(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int next_state)
{
return -1;
}
static inline int cpuidle_coupled_register_device(struct cpuidle_device *dev)
{
return 0;
}
static inline void cpuidle_coupled_unregister_device(struct cpuidle_device *dev)
{
}
#endif
#endif /* __DRIVER_CPUIDLE_H */