326 lines
13 KiB
C
326 lines
13 KiB
C
/*
|
|
* powercap.h: Data types and headers for sysfs power capping interface
|
|
* Copyright (c) 2013, Intel Corporation.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
* more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along with
|
|
* this program; if not, write to the Free Software Foundation, Inc.
|
|
*
|
|
*/
|
|
|
|
#ifndef __POWERCAP_H__
|
|
#define __POWERCAP_H__
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/idr.h>
|
|
|
|
/*
|
|
* A power cap class device can contain multiple powercap control_types.
|
|
* Each control_type can have multiple power zones, which can be independently
|
|
* controlled. Each power zone can have one or more constraints.
|
|
*/
|
|
|
|
struct powercap_control_type;
|
|
struct powercap_zone;
|
|
struct powercap_zone_constraint;
|
|
|
|
/**
|
|
* struct powercap_control_type_ops - Define control type callbacks
|
|
* @set_enable: Enable/Disable whole control type.
|
|
* Default is enabled. But this callback allows all zones
|
|
* to be in disable state and remove any applied power
|
|
* limits. If disabled power zone can only be monitored
|
|
* not controlled.
|
|
* @get_enable: get Enable/Disable status.
|
|
* @release: Callback to inform that last reference to this
|
|
* control type is closed. So it is safe to free data
|
|
* structure associated with this control type.
|
|
* This callback is mandatory if the client own memory
|
|
* for the control type.
|
|
*
|
|
* This structure defines control type callbacks to be implemented by client
|
|
* drivers
|
|
*/
|
|
struct powercap_control_type_ops {
|
|
int (*set_enable) (struct powercap_control_type *, bool mode);
|
|
int (*get_enable) (struct powercap_control_type *, bool *mode);
|
|
int (*release) (struct powercap_control_type *);
|
|
};
|
|
|
|
/**
|
|
* struct powercap_control_type- Defines a powercap control_type
|
|
* @name: name of control_type
|
|
* @dev: device for this control_type
|
|
* @idr: idr to have unique id for its child
|
|
* @root_node: Root holding power zones for this control_type
|
|
* @ops: Pointer to callback struct
|
|
* @node_lock: mutex for control type
|
|
* @allocated: This is possible that client owns the memory
|
|
* used by this structure. In this case
|
|
* this flag is set to false by framework to
|
|
* prevent deallocation during release process.
|
|
* Otherwise this flag is set to true.
|
|
* @ctrl_inst: link to the control_type list
|
|
*
|
|
* Defines powercap control_type. This acts as a container for power
|
|
* zones, which use same method to control power. E.g. RAPL, RAPL-PCI etc.
|
|
* All fields are private and should not be used by client drivers.
|
|
*/
|
|
struct powercap_control_type {
|
|
struct device dev;
|
|
struct idr idr;
|
|
int nr_zones;
|
|
const struct powercap_control_type_ops *ops;
|
|
struct mutex lock;
|
|
bool allocated;
|
|
struct list_head node;
|
|
};
|
|
|
|
/**
|
|
* struct powercap_zone_ops - Define power zone callbacks
|
|
* @get_max_energy_range_uj: Get maximum range of energy counter in
|
|
* micro-joules.
|
|
* @get_energy_uj: Get current energy counter in micro-joules.
|
|
* @reset_energy_uj: Reset micro-joules energy counter.
|
|
* @get_max_power_range_uw: Get maximum range of power counter in
|
|
* micro-watts.
|
|
* @get_power_uw: Get current power counter in micro-watts.
|
|
* @set_enable: Enable/Disable power zone controls.
|
|
* Default is enabled.
|
|
* @get_enable: get Enable/Disable status.
|
|
* @release: Callback to inform that last reference to this
|
|
* control type is closed. So it is safe to free
|
|
* data structure associated with this
|
|
* control type. Mandatory, if client driver owns
|
|
* the power_zone memory.
|
|
*
|
|
* This structure defines zone callbacks to be implemented by client drivers.
|
|
* Client drives can define both energy and power related callbacks. But at
|
|
* the least one type (either power or energy) is mandatory. Client drivers
|
|
* should handle mutual exclusion, if required in callbacks.
|
|
*/
|
|
struct powercap_zone_ops {
|
|
int (*get_max_energy_range_uj) (struct powercap_zone *, u64 *);
|
|
int (*get_energy_uj) (struct powercap_zone *, u64 *);
|
|
int (*reset_energy_uj) (struct powercap_zone *);
|
|
int (*get_max_power_range_uw) (struct powercap_zone *, u64 *);
|
|
int (*get_power_uw) (struct powercap_zone *, u64 *);
|
|
int (*set_enable) (struct powercap_zone *, bool mode);
|
|
int (*get_enable) (struct powercap_zone *, bool *mode);
|
|
int (*release) (struct powercap_zone *);
|
|
};
|
|
|
|
#define POWERCAP_ZONE_MAX_ATTRS 6
|
|
#define POWERCAP_CONSTRAINTS_ATTRS 8
|
|
#define MAX_CONSTRAINTS_PER_ZONE 10
|
|
/**
|
|
* struct powercap_zone- Defines instance of a power cap zone
|
|
* @id: Unique id
|
|
* @name: Power zone name.
|
|
* @control_type_inst: Control type instance for this zone.
|
|
* @ops: Pointer to the zone operation structure.
|
|
* @dev: Instance of a device.
|
|
* @const_id_cnt: Number of constraint defined.
|
|
* @idr: Instance to an idr entry for children zones.
|
|
* @parent_idr: To remove reference from the parent idr.
|
|
* @private_data: Private data pointer if any for this zone.
|
|
* @zone_dev_attrs: Attributes associated with this device.
|
|
* @zone_attr_count: Attribute count.
|
|
* @dev_zone_attr_group: Attribute group for attributes.
|
|
* @dev_attr_groups: Attribute group store to register with device.
|
|
* @allocated: This is possible that client owns the memory
|
|
* used by this structure. In this case
|
|
* this flag is set to false by framework to
|
|
* prevent deallocation during release process.
|
|
* Otherwise this flag is set to true.
|
|
* @constraint_ptr: List of constraints for this zone.
|
|
*
|
|
* This defines a power zone instance. The fields of this structure are
|
|
* private, and should not be used by client drivers.
|
|
*/
|
|
struct powercap_zone {
|
|
int id;
|
|
char *name;
|
|
void *control_type_inst;
|
|
const struct powercap_zone_ops *ops;
|
|
struct device dev;
|
|
int const_id_cnt;
|
|
struct idr idr;
|
|
struct idr *parent_idr;
|
|
void *private_data;
|
|
struct attribute **zone_dev_attrs;
|
|
int zone_attr_count;
|
|
struct attribute_group dev_zone_attr_group;
|
|
const struct attribute_group *dev_attr_groups[2]; /* 1 group + NULL */
|
|
bool allocated;
|
|
struct powercap_zone_constraint *constraints;
|
|
};
|
|
|
|
/**
|
|
* struct powercap_zone_constraint_ops - Define constraint callbacks
|
|
* @set_power_limit_uw: Set power limit in micro-watts.
|
|
* @get_power_limit_uw: Get power limit in micro-watts.
|
|
* @set_time_window_us: Set time window in micro-seconds.
|
|
* @get_time_window_us: Get time window in micro-seconds.
|
|
* @get_max_power_uw: Get max power allowed in micro-watts.
|
|
* @get_min_power_uw: Get min power allowed in micro-watts.
|
|
* @get_max_time_window_us: Get max time window allowed in micro-seconds.
|
|
* @get_min_time_window_us: Get min time window allowed in micro-seconds.
|
|
* @get_name: Get the name of constraint
|
|
*
|
|
* This structure is used to define the constraint callbacks for the client
|
|
* drivers. The following callbacks are mandatory and can't be NULL:
|
|
* set_power_limit_uw
|
|
* get_power_limit_uw
|
|
* set_time_window_us
|
|
* get_time_window_us
|
|
* get_name
|
|
* Client drivers should handle mutual exclusion, if required in callbacks.
|
|
*/
|
|
struct powercap_zone_constraint_ops {
|
|
int (*set_power_limit_uw) (struct powercap_zone *, int, u64);
|
|
int (*get_power_limit_uw) (struct powercap_zone *, int, u64 *);
|
|
int (*set_time_window_us) (struct powercap_zone *, int, u64);
|
|
int (*get_time_window_us) (struct powercap_zone *, int, u64 *);
|
|
int (*get_max_power_uw) (struct powercap_zone *, int, u64 *);
|
|
int (*get_min_power_uw) (struct powercap_zone *, int, u64 *);
|
|
int (*get_max_time_window_us) (struct powercap_zone *, int, u64 *);
|
|
int (*get_min_time_window_us) (struct powercap_zone *, int, u64 *);
|
|
const char *(*get_name) (struct powercap_zone *, int);
|
|
};
|
|
|
|
/**
|
|
* struct powercap_zone_constraint- Defines instance of a constraint
|
|
* @id: Instance Id of this constraint.
|
|
* @power_zone: Pointer to the power zone for this constraint.
|
|
* @ops: Pointer to the constraint callbacks.
|
|
*
|
|
* This defines a constraint instance.
|
|
*/
|
|
struct powercap_zone_constraint {
|
|
int id;
|
|
struct powercap_zone *power_zone;
|
|
const struct powercap_zone_constraint_ops *ops;
|
|
};
|
|
|
|
|
|
/* For clients to get their device pointer, may be used for dev_dbgs */
|
|
#define POWERCAP_GET_DEV(power_zone) (&power_zone->dev)
|
|
|
|
/**
|
|
* powercap_set_zone_data() - Set private data for a zone
|
|
* @power_zone: A pointer to the valid zone instance.
|
|
* @pdata: A pointer to the user private data.
|
|
*
|
|
* Allows client drivers to associate some private data to zone instance.
|
|
*/
|
|
static inline void powercap_set_zone_data(struct powercap_zone *power_zone,
|
|
void *pdata)
|
|
{
|
|
if (power_zone)
|
|
power_zone->private_data = pdata;
|
|
}
|
|
|
|
/**
|
|
* powercap_get_zone_data() - Get private data for a zone
|
|
* @power_zone: A pointer to the valid zone instance.
|
|
*
|
|
* Allows client drivers to get private data associate with a zone,
|
|
* using call to powercap_set_zone_data.
|
|
*/
|
|
static inline void *powercap_get_zone_data(struct powercap_zone *power_zone)
|
|
{
|
|
if (power_zone)
|
|
return power_zone->private_data;
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* powercap_register_control_type() - Register a control_type with framework
|
|
* @control_type: Pointer to client allocated memory for the control type
|
|
* structure storage. If this is NULL, powercap framework
|
|
* will allocate memory and own it.
|
|
* Advantage of this parameter is that client can embed
|
|
* this data in its data structures and allocate in a
|
|
* single call, preventing multiple allocations.
|
|
* @control_type_name: The Name of this control_type, which will be shown
|
|
* in the sysfs Interface.
|
|
* @ops: Callbacks for control type. This parameter is optional.
|
|
*
|
|
* Used to create a control_type with the power capping class. Here control_type
|
|
* can represent a type of technology, which can control a range of power zones.
|
|
* For example a control_type can be RAPL (Running Average Power Limit)
|
|
* Intel® 64 and IA-32 Processor Architectures. The name can be any string
|
|
* which must be unique, otherwise this function returns NULL.
|
|
* A pointer to the control_type instance is returned on success.
|
|
*/
|
|
struct powercap_control_type *powercap_register_control_type(
|
|
struct powercap_control_type *control_type,
|
|
const char *name,
|
|
const struct powercap_control_type_ops *ops);
|
|
|
|
/**
|
|
* powercap_unregister_control_type() - Unregister a control_type from framework
|
|
* @instance: A pointer to the valid control_type instance.
|
|
*
|
|
* Used to unregister a control_type with the power capping class.
|
|
* All power zones registered under this control type have to be unregistered
|
|
* before calling this function, or it will fail with an error code.
|
|
*/
|
|
int powercap_unregister_control_type(struct powercap_control_type *instance);
|
|
|
|
/* Zone register/unregister API */
|
|
|
|
/**
|
|
* powercap_register_zone() - Register a power zone
|
|
* @power_zone: Pointer to client allocated memory for the power zone structure
|
|
* storage. If this is NULL, powercap framework will allocate
|
|
* memory and own it. Advantage of this parameter is that client
|
|
* can embed this data in its data structures and allocate in a
|
|
* single call, preventing multiple allocations.
|
|
* @control_type: A control_type instance under which this zone operates.
|
|
* @name: A name for this zone.
|
|
* @parent: A pointer to the parent power zone instance if any or NULL
|
|
* @ops: Pointer to zone operation callback structure.
|
|
* @no_constraints: Number of constraints for this zone
|
|
* @const_ops: Pointer to constraint callback structure
|
|
*
|
|
* Register a power zone under a given control type. A power zone must register
|
|
* a pointer to a structure representing zone callbacks.
|
|
* A power zone can be located under a parent power zone, in which case @parent
|
|
* should point to it. Otherwise, if @parent is NULL, the new power zone will
|
|
* be located directly under the given control type
|
|
* For each power zone there may be a number of constraints that appear in the
|
|
* sysfs under that zone as attributes with unique numeric IDs.
|
|
* Returns pointer to the power_zone on success.
|
|
*/
|
|
struct powercap_zone *powercap_register_zone(
|
|
struct powercap_zone *power_zone,
|
|
struct powercap_control_type *control_type,
|
|
const char *name,
|
|
struct powercap_zone *parent,
|
|
const struct powercap_zone_ops *ops,
|
|
int nr_constraints,
|
|
const struct powercap_zone_constraint_ops *const_ops);
|
|
|
|
/**
|
|
* powercap_unregister_zone() - Unregister a zone device
|
|
* @control_type: A pointer to the valid instance of a control_type.
|
|
* @power_zone: A pointer to the valid zone instance for a control_type
|
|
*
|
|
* Used to unregister a zone device for a control_type. Caller should
|
|
* make sure that children for this zone are unregistered first.
|
|
*/
|
|
int powercap_unregister_zone(struct powercap_control_type *control_type,
|
|
struct powercap_zone *power_zone);
|
|
|
|
#endif
|