mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 11:18:45 +07:00
3aa5374376
When the devfreq cooling device was designed, it was an oversight not to pass a pointer to the struct devfreq as the first parameters of the callbacks. The design patterns of the kernel suggest it for a good reason. By passing a pointer to struct devfreq, the driver can register one function that works with multiple devices. With the current implementation, a driver that can work with multiple devices has to create multiple copies of the same function with different parameters so that each devfreq_cooling_device can use the appropriate one. By passing a pointer to struct devfreq, the driver can identify which device it's referring to. Cc: Zhang Rui <rui.zhang@intel.com> Cc: Eduardo Valentin <edubezval@gmail.com> Reviewed-by: Punit Agrawal <punit.agrawal@arm.com> Reviewed-by: Ørjan Eide <orjan.eide@arm.com> Reviewed-by: Lukasz Luba <lukasz.luba@arm.com> Signed-off-by: Javi Merino <javi.merino@arm.com> Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
85 lines
2.6 KiB
C
85 lines
2.6 KiB
C
/*
|
|
* devfreq_cooling: Thermal cooling device implementation for devices using
|
|
* devfreq
|
|
*
|
|
* Copyright (C) 2014-2015 ARM Limited
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
|
|
* kind, whether express or implied; without even the implied warranty
|
|
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*/
|
|
|
|
#ifndef __DEVFREQ_COOLING_H__
|
|
#define __DEVFREQ_COOLING_H__
|
|
|
|
#include <linux/devfreq.h>
|
|
#include <linux/thermal.h>
|
|
|
|
|
|
/**
|
|
* struct devfreq_cooling_power - Devfreq cooling power ops
|
|
* @get_static_power: Take voltage, in mV, and return the static power
|
|
* in mW. If NULL, the static power is assumed
|
|
* to be 0.
|
|
* @get_dynamic_power: Take voltage, in mV, and frequency, in HZ, and
|
|
* return the dynamic power draw in mW. If NULL,
|
|
* a simple power model is used.
|
|
* @dyn_power_coeff: Coefficient for the simple dynamic power model in
|
|
* mW/(MHz mV mV).
|
|
* If get_dynamic_power() is NULL, then the
|
|
* dynamic power is calculated as
|
|
* @dyn_power_coeff * frequency * voltage^2
|
|
*/
|
|
struct devfreq_cooling_power {
|
|
unsigned long (*get_static_power)(struct devfreq *devfreq,
|
|
unsigned long voltage);
|
|
unsigned long (*get_dynamic_power)(struct devfreq *devfreq,
|
|
unsigned long freq,
|
|
unsigned long voltage);
|
|
unsigned long dyn_power_coeff;
|
|
};
|
|
|
|
#ifdef CONFIG_DEVFREQ_THERMAL
|
|
|
|
struct thermal_cooling_device *
|
|
of_devfreq_cooling_register_power(struct device_node *np, struct devfreq *df,
|
|
struct devfreq_cooling_power *dfc_power);
|
|
struct thermal_cooling_device *
|
|
of_devfreq_cooling_register(struct device_node *np, struct devfreq *df);
|
|
struct thermal_cooling_device *devfreq_cooling_register(struct devfreq *df);
|
|
void devfreq_cooling_unregister(struct thermal_cooling_device *dfc);
|
|
|
|
#else /* !CONFIG_DEVFREQ_THERMAL */
|
|
|
|
struct thermal_cooling_device *
|
|
of_devfreq_cooling_register_power(struct device_node *np, struct devfreq *df,
|
|
struct devfreq_cooling_power *dfc_power)
|
|
{
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
static inline struct thermal_cooling_device *
|
|
of_devfreq_cooling_register(struct device_node *np, struct devfreq *df)
|
|
{
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
static inline struct thermal_cooling_device *
|
|
devfreq_cooling_register(struct devfreq *df)
|
|
{
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
static inline void
|
|
devfreq_cooling_unregister(struct thermal_cooling_device *dfc)
|
|
{
|
|
}
|
|
|
|
#endif /* CONFIG_DEVFREQ_THERMAL */
|
|
#endif /* __DEVFREQ_COOLING_H__ */
|