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powercap.h
/* SPDX-License-Identifier: GPL-2.0-only */ /* * powercap.h: Data types and headers for sysfs power capping interface * Copyright (c) 2013, Intel Corporation. */ #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 * @dev: device for this control_type * @idr: idr to have unique id for its child * @nr_zones: counter for number of zones of this type * @ops: Pointer to callback struct * @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. * @node: linked-list node * * 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. * @constraints: 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
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