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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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cb5d8c45ab
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>
76 lines
2.2 KiB
C
76 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* cpuidle.h - The internal header file
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*/
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#ifndef __DRIVER_CPUIDLE_H
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#define __DRIVER_CPUIDLE_H
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/* For internal use only */
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extern char param_governor[];
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extern struct cpuidle_governor *cpuidle_curr_governor;
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extern struct cpuidle_governor *cpuidle_prev_governor;
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extern struct list_head cpuidle_governors;
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extern struct list_head cpuidle_detected_devices;
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extern struct mutex cpuidle_lock;
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extern spinlock_t cpuidle_driver_lock;
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extern int cpuidle_disabled(void);
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extern int cpuidle_enter_state(struct cpuidle_device *dev,
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struct cpuidle_driver *drv, int next_state);
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/* idle loop */
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extern void cpuidle_install_idle_handler(void);
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extern void cpuidle_uninstall_idle_handler(void);
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/* governors */
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extern struct cpuidle_governor *cpuidle_find_governor(const char *str);
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extern int cpuidle_switch_governor(struct cpuidle_governor *gov);
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/* sysfs */
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struct device;
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extern int cpuidle_add_interface(struct device *dev);
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extern void cpuidle_remove_interface(struct device *dev);
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extern int cpuidle_add_device_sysfs(struct cpuidle_device *device);
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extern void cpuidle_remove_device_sysfs(struct cpuidle_device *device);
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extern int cpuidle_add_sysfs(struct cpuidle_device *dev);
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extern void cpuidle_remove_sysfs(struct cpuidle_device *dev);
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#ifdef CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED
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bool cpuidle_state_is_coupled(struct cpuidle_driver *drv, int state);
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int cpuidle_coupled_state_verify(struct cpuidle_driver *drv);
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int cpuidle_enter_state_coupled(struct cpuidle_device *dev,
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struct cpuidle_driver *drv, int next_state);
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int cpuidle_coupled_register_device(struct cpuidle_device *dev);
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void cpuidle_coupled_unregister_device(struct cpuidle_device *dev);
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#else
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static inline
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bool cpuidle_state_is_coupled(struct cpuidle_driver *drv, int state)
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{
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return false;
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}
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static inline int cpuidle_coupled_state_verify(struct cpuidle_driver *drv)
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{
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return 0;
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}
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static inline int cpuidle_enter_state_coupled(struct cpuidle_device *dev,
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struct cpuidle_driver *drv, int next_state)
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{
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return -1;
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}
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static inline int cpuidle_coupled_register_device(struct cpuidle_device *dev)
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{
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return 0;
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}
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static inline void cpuidle_coupled_unregister_device(struct cpuidle_device *dev)
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{
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}
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#endif
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#endif /* __DRIVER_CPUIDLE_H */
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