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1 | /* |
2 | * powercap.h: Data types and headers for sysfs power capping interface | |
3 | * Copyright (c) 2013, Intel Corporation. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms and conditions of the GNU General Public License, | |
7 | * version 2, as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along with | |
15 | * this program; if not, write to the Free Software Foundation, Inc. | |
16 | * | |
17 | */ | |
18 | ||
19 | #ifndef __POWERCAP_H__ | |
20 | #define __POWERCAP_H__ | |
21 | ||
22 | #include <linux/device.h> | |
23 | #include <linux/idr.h> | |
24 | ||
25 | /* | |
26 | * A power cap class device can contain multiple powercap control_types. | |
27 | * Each control_type can have multiple power zones, which can be independently | |
28 | * controlled. Each power zone can have one or more constraints. | |
29 | */ | |
30 | ||
31 | struct powercap_control_type; | |
32 | struct powercap_zone; | |
33 | struct powercap_zone_constraint; | |
34 | ||
35 | /** | |
36 | * struct powercap_control_type_ops - Define control type callbacks | |
37 | * @set_enable: Enable/Disable whole control type. | |
38 | * Default is enabled. But this callback allows all zones | |
39 | * to be in disable state and remove any applied power | |
40 | * limits. If disabled power zone can only be monitored | |
41 | * not controlled. | |
42 | * @get_enable: get Enable/Disable status. | |
43 | * @release: Callback to inform that last reference to this | |
44 | * control type is closed. So it is safe to free data | |
45 | * structure associated with this control type. | |
46 | * This callback is mandatory if the client own memory | |
47 | * for the control type. | |
48 | * | |
49 | * This structure defines control type callbacks to be implemented by client | |
50 | * drivers | |
51 | */ | |
52 | struct powercap_control_type_ops { | |
53 | int (*set_enable) (struct powercap_control_type *, bool mode); | |
54 | int (*get_enable) (struct powercap_control_type *, bool *mode); | |
55 | int (*release) (struct powercap_control_type *); | |
56 | }; | |
57 | ||
58 | /** | |
59 | * struct powercap_control_type- Defines a powercap control_type | |
60 | * @name: name of control_type | |
61 | * @dev: device for this control_type | |
62 | * @idr: idr to have unique id for its child | |
63 | * @root_node: Root holding power zones for this control_type | |
64 | * @ops: Pointer to callback struct | |
65 | * @node_lock: mutex for control type | |
66 | * @allocated: This is possible that client owns the memory | |
67 | * used by this structure. In this case | |
68 | * this flag is set to false by framework to | |
69 | * prevent deallocation during release process. | |
70 | * Otherwise this flag is set to true. | |
71 | * @ctrl_inst: link to the control_type list | |
72 | * | |
73 | * Defines powercap control_type. This acts as a container for power | |
74 | * zones, which use same method to control power. E.g. RAPL, RAPL-PCI etc. | |
75 | * All fields are private and should not be used by client drivers. | |
76 | */ | |
77 | struct powercap_control_type { | |
78 | struct device dev; | |
79 | struct idr idr; | |
80 | int nr_zones; | |
81 | const struct powercap_control_type_ops *ops; | |
82 | struct mutex lock; | |
83 | bool allocated; | |
84 | struct list_head node; | |
85 | }; | |
86 | ||
87 | /** | |
88 | * struct powercap_zone_ops - Define power zone callbacks | |
89 | * @get_max_energy_range_uj: Get maximum range of energy counter in | |
90 | * micro-joules. | |
91 | * @get_energy_uj: Get current energy counter in micro-joules. | |
92 | * @reset_energy_uj: Reset micro-joules energy counter. | |
93 | * @get_max_power_range_uw: Get maximum range of power counter in | |
94 | * micro-watts. | |
95 | * @get_power_uw: Get current power counter in micro-watts. | |
96 | * @set_enable: Enable/Disable power zone controls. | |
97 | * Default is enabled. | |
98 | * @get_enable: get Enable/Disable status. | |
99 | * @release: Callback to inform that last reference to this | |
100 | * control type is closed. So it is safe to free | |
101 | * data structure associated with this | |
102 | * control type. Mandatory, if client driver owns | |
103 | * the power_zone memory. | |
104 | * | |
105 | * This structure defines zone callbacks to be implemented by client drivers. | |
106 | * Client drives can define both energy and power related callbacks. But at | |
107 | * the least one type (either power or energy) is mandatory. Client drivers | |
108 | * should handle mutual exclusion, if required in callbacks. | |
109 | */ | |
110 | struct powercap_zone_ops { | |
111 | int (*get_max_energy_range_uj) (struct powercap_zone *, u64 *); | |
112 | int (*get_energy_uj) (struct powercap_zone *, u64 *); | |
113 | int (*reset_energy_uj) (struct powercap_zone *); | |
114 | int (*get_max_power_range_uw) (struct powercap_zone *, u64 *); | |
115 | int (*get_power_uw) (struct powercap_zone *, u64 *); | |
116 | int (*set_enable) (struct powercap_zone *, bool mode); | |
117 | int (*get_enable) (struct powercap_zone *, bool *mode); | |
118 | int (*release) (struct powercap_zone *); | |
119 | }; | |
120 | ||
121 | #define POWERCAP_ZONE_MAX_ATTRS 6 | |
122 | #define POWERCAP_CONSTRAINTS_ATTRS 8 | |
123 | #define MAX_CONSTRAINTS_PER_ZONE 10 | |
124 | /** | |
125 | * struct powercap_zone- Defines instance of a power cap zone | |
126 | * @id: Unique id | |
127 | * @name: Power zone name. | |
128 | * @control_type_inst: Control type instance for this zone. | |
129 | * @ops: Pointer to the zone operation structure. | |
130 | * @dev: Instance of a device. | |
131 | * @const_id_cnt: Number of constraint defined. | |
132 | * @idr: Instance to an idr entry for children zones. | |
133 | * @parent_idr: To remove reference from the parent idr. | |
134 | * @private_data: Private data pointer if any for this zone. | |
135 | * @zone_dev_attrs: Attributes associated with this device. | |
136 | * @zone_attr_count: Attribute count. | |
137 | * @dev_zone_attr_group: Attribute group for attributes. | |
138 | * @dev_attr_groups: Attribute group store to register with device. | |
139 | * @allocated: This is possible that client owns the memory | |
140 | * used by this structure. In this case | |
141 | * this flag is set to false by framework to | |
142 | * prevent deallocation during release process. | |
143 | * Otherwise this flag is set to true. | |
144 | * @constraint_ptr: List of constraints for this zone. | |
145 | * | |
146 | * This defines a power zone instance. The fields of this structure are | |
147 | * private, and should not be used by client drivers. | |
148 | */ | |
149 | struct powercap_zone { | |
150 | int id; | |
151 | char *name; | |
152 | void *control_type_inst; | |
153 | const struct powercap_zone_ops *ops; | |
154 | struct device dev; | |
155 | int const_id_cnt; | |
156 | struct idr idr; | |
157 | struct idr *parent_idr; | |
158 | void *private_data; | |
159 | struct attribute **zone_dev_attrs; | |
160 | int zone_attr_count; | |
161 | struct attribute_group dev_zone_attr_group; | |
162 | const struct attribute_group *dev_attr_groups[2]; /* 1 group + NULL */ | |
163 | bool allocated; | |
164 | struct powercap_zone_constraint *constraints; | |
165 | }; | |
166 | ||
167 | /** | |
168 | * struct powercap_zone_constraint_ops - Define constraint callbacks | |
169 | * @set_power_limit_uw: Set power limit in micro-watts. | |
170 | * @get_power_limit_uw: Get power limit in micro-watts. | |
171 | * @set_time_window_us: Set time window in micro-seconds. | |
172 | * @get_time_window_us: Get time window in micro-seconds. | |
173 | * @get_max_power_uw: Get max power allowed in micro-watts. | |
174 | * @get_min_power_uw: Get min power allowed in micro-watts. | |
175 | * @get_max_time_window_us: Get max time window allowed in micro-seconds. | |
176 | * @get_min_time_window_us: Get min time window allowed in micro-seconds. | |
177 | * @get_name: Get the name of constraint | |
178 | * | |
179 | * This structure is used to define the constraint callbacks for the client | |
180 | * drivers. The following callbacks are mandatory and can't be NULL: | |
181 | * set_power_limit_uw | |
182 | * get_power_limit_uw | |
183 | * set_time_window_us | |
184 | * get_time_window_us | |
185 | * get_name | |
186 | * Client drivers should handle mutual exclusion, if required in callbacks. | |
187 | */ | |
188 | struct powercap_zone_constraint_ops { | |
189 | int (*set_power_limit_uw) (struct powercap_zone *, int, u64); | |
190 | int (*get_power_limit_uw) (struct powercap_zone *, int, u64 *); | |
191 | int (*set_time_window_us) (struct powercap_zone *, int, u64); | |
192 | int (*get_time_window_us) (struct powercap_zone *, int, u64 *); | |
193 | int (*get_max_power_uw) (struct powercap_zone *, int, u64 *); | |
194 | int (*get_min_power_uw) (struct powercap_zone *, int, u64 *); | |
195 | int (*get_max_time_window_us) (struct powercap_zone *, int, u64 *); | |
196 | int (*get_min_time_window_us) (struct powercap_zone *, int, u64 *); | |
197 | const char *(*get_name) (struct powercap_zone *, int); | |
198 | }; | |
199 | ||
200 | /** | |
201 | * struct powercap_zone_constraint- Defines instance of a constraint | |
202 | * @id: Instance Id of this constraint. | |
203 | * @power_zone: Pointer to the power zone for this constraint. | |
204 | * @ops: Pointer to the constraint callbacks. | |
205 | * | |
206 | * This defines a constraint instance. | |
207 | */ | |
208 | struct powercap_zone_constraint { | |
209 | int id; | |
210 | struct powercap_zone *power_zone; | |
211 | struct powercap_zone_constraint_ops *ops; | |
212 | }; | |
213 | ||
214 | ||
215 | /* For clients to get their device pointer, may be used for dev_dbgs */ | |
216 | #define POWERCAP_GET_DEV(power_zone) (&power_zone->dev) | |
217 | ||
218 | /** | |
219 | * powercap_set_zone_data() - Set private data for a zone | |
220 | * @power_zone: A pointer to the valid zone instance. | |
221 | * @pdata: A pointer to the user private data. | |
222 | * | |
223 | * Allows client drivers to associate some private data to zone instance. | |
224 | */ | |
225 | static inline void powercap_set_zone_data(struct powercap_zone *power_zone, | |
226 | void *pdata) | |
227 | { | |
228 | if (power_zone) | |
229 | power_zone->private_data = pdata; | |
230 | } | |
231 | ||
232 | /** | |
233 | * powercap_get_zone_data() - Get private data for a zone | |
234 | * @power_zone: A pointer to the valid zone instance. | |
235 | * | |
236 | * Allows client drivers to get private data associate with a zone, | |
237 | * using call to powercap_set_zone_data. | |
238 | */ | |
239 | static inline void *powercap_get_zone_data(struct powercap_zone *power_zone) | |
240 | { | |
241 | if (power_zone) | |
242 | return power_zone->private_data; | |
243 | return NULL; | |
244 | } | |
245 | ||
246 | /** | |
247 | * powercap_register_control_type() - Register a control_type with framework | |
248 | * @control_type: Pointer to client allocated memory for the control type | |
249 | * structure storage. If this is NULL, powercap framework | |
250 | * will allocate memory and own it. | |
251 | * Advantage of this parameter is that client can embed | |
252 | * this data in its data structures and allocate in a | |
253 | * single call, preventing multiple allocations. | |
254 | * @control_type_name: The Name of this control_type, which will be shown | |
255 | * in the sysfs Interface. | |
256 | * @ops: Callbacks for control type. This parameter is optional. | |
257 | * | |
258 | * Used to create a control_type with the power capping class. Here control_type | |
259 | * can represent a type of technology, which can control a range of power zones. | |
260 | * For example a control_type can be RAPL (Running Average Power Limit) | |
261 | * IntelĀ® 64 and IA-32 Processor Architectures. The name can be any string | |
262 | * which must be unique, otherwise this function returns NULL. | |
263 | * A pointer to the control_type instance is returned on success. | |
264 | */ | |
265 | struct powercap_control_type *powercap_register_control_type( | |
266 | struct powercap_control_type *control_type, | |
267 | const char *name, | |
268 | const struct powercap_control_type_ops *ops); | |
269 | ||
270 | /** | |
271 | * powercap_unregister_control_type() - Unregister a control_type from framework | |
272 | * @instance: A pointer to the valid control_type instance. | |
273 | * | |
274 | * Used to unregister a control_type with the power capping class. | |
275 | * All power zones registered under this control type have to be unregistered | |
276 | * before calling this function, or it will fail with an error code. | |
277 | */ | |
278 | int powercap_unregister_control_type(struct powercap_control_type *instance); | |
279 | ||
280 | /* Zone register/unregister API */ | |
281 | ||
282 | /** | |
283 | * powercap_register_zone() - Register a power zone | |
284 | * @power_zone: Pointer to client allocated memory for the power zone structure | |
285 | * storage. If this is NULL, powercap framework will allocate | |
286 | * memory and own it. Advantage of this parameter is that client | |
287 | * can embed this data in its data structures and allocate in a | |
288 | * single call, preventing multiple allocations. | |
289 | * @control_type: A control_type instance under which this zone operates. | |
290 | * @name: A name for this zone. | |
291 | * @parent: A pointer to the parent power zone instance if any or NULL | |
292 | * @ops: Pointer to zone operation callback structure. | |
293 | * @no_constraints: Number of constraints for this zone | |
294 | * @const_ops: Pointer to constraint callback structure | |
295 | * | |
296 | * Register a power zone under a given control type. A power zone must register | |
297 | * a pointer to a structure representing zone callbacks. | |
298 | * A power zone can be located under a parent power zone, in which case @parent | |
299 | * should point to it. Otherwise, if @parent is NULL, the new power zone will | |
300 | * be located directly under the given control type | |
301 | * For each power zone there may be a number of constraints that appear in the | |
302 | * sysfs under that zone as attributes with unique numeric IDs. | |
303 | * Returns pointer to the power_zone on success. | |
304 | */ | |
305 | struct powercap_zone *powercap_register_zone( | |
306 | struct powercap_zone *power_zone, | |
307 | struct powercap_control_type *control_type, | |
308 | const char *name, | |
309 | struct powercap_zone *parent, | |
310 | const struct powercap_zone_ops *ops, | |
311 | int nr_constraints, | |
312 | struct powercap_zone_constraint_ops *const_ops); | |
313 | ||
314 | /** | |
315 | * powercap_unregister_zone() - Unregister a zone device | |
316 | * @control_type: A pointer to the valid instance of a control_type. | |
317 | * @power_zone: A pointer to the valid zone instance for a control_type | |
318 | * | |
319 | * Used to unregister a zone device for a control_type. Caller should | |
320 | * make sure that children for this zone are unregistered first. | |
321 | */ | |
322 | int powercap_unregister_zone(struct powercap_control_type *control_type, | |
323 | struct powercap_zone *power_zone); | |
324 | ||
325 | #endif |