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