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02361418 ADK |
1 | /* |
2 | * linux/drivers/thermal/cpu_cooling.c | |
3 | * | |
4 | * Copyright (C) 2012 Samsung Electronics Co., Ltd(http://www.samsung.com) | |
5 | * Copyright (C) 2012 Amit Daniel <amit.kachhap@linaro.org> | |
6 | * | |
73904cbc VK |
7 | * Copyright (C) 2014 Viresh Kumar <viresh.kumar@linaro.org> |
8 | * | |
02361418 ADK |
9 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; version 2 of the License. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, but | |
15 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write to the Free Software Foundation, Inc., | |
21 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
22 | * | |
23 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
24 | */ | |
02361418 ADK |
25 | #include <linux/module.h> |
26 | #include <linux/thermal.h> | |
02361418 ADK |
27 | #include <linux/cpufreq.h> |
28 | #include <linux/err.h> | |
ae606089 | 29 | #include <linux/idr.h> |
c36cf071 | 30 | #include <linux/pm_opp.h> |
02361418 ADK |
31 | #include <linux/slab.h> |
32 | #include <linux/cpu.h> | |
33 | #include <linux/cpu_cooling.h> | |
34 | ||
6828a471 JM |
35 | #include <trace/events/thermal.h> |
36 | ||
07d888d8 VK |
37 | /* |
38 | * Cooling state <-> CPUFreq frequency | |
39 | * | |
40 | * Cooling states are translated to frequencies throughout this driver and this | |
41 | * is the relation between them. | |
42 | * | |
43 | * Highest cooling state corresponds to lowest possible frequency. | |
44 | * | |
45 | * i.e. | |
46 | * level 0 --> 1st Max Freq | |
47 | * level 1 --> 2nd Max Freq | |
48 | * ... | |
49 | */ | |
50 | ||
c36cf071 | 51 | /** |
349d39dc | 52 | * struct freq_table - frequency table along with power entries |
c36cf071 JM |
53 | * @frequency: frequency in KHz |
54 | * @power: power in mW | |
55 | * | |
56 | * This structure is built when the cooling device registers and helps | |
349d39dc | 57 | * in translating frequency to power and vice versa. |
c36cf071 | 58 | */ |
349d39dc | 59 | struct freq_table { |
c36cf071 JM |
60 | u32 frequency; |
61 | u32 power; | |
62 | }; | |
63 | ||
81ee14da VK |
64 | /** |
65 | * struct time_in_idle - Idle time stats | |
66 | * @time: previous reading of the absolute time that this cpu was idle | |
67 | * @timestamp: wall time of the last invocation of get_cpu_idle_time_us() | |
68 | */ | |
69 | struct time_in_idle { | |
70 | u64 time; | |
71 | u64 timestamp; | |
72 | }; | |
73 | ||
02361418 | 74 | /** |
3b3c0748 | 75 | * struct cpufreq_cooling_device - data for cooling device with cpufreq |
02361418 ADK |
76 | * @id: unique integer value corresponding to each cpufreq_cooling_device |
77 | * registered. | |
d72b4015 | 78 | * @last_load: load measured by the latest call to cpufreq_get_requested_power() |
02361418 ADK |
79 | * @cpufreq_state: integer value representing the current state of cpufreq |
80 | * cooling devices. | |
59f0d218 | 81 | * @clipped_freq: integer value representing the absolute value of the clipped |
02361418 | 82 | * frequency. |
dcc6c7fd VK |
83 | * @max_level: maximum cooling level. One less than total number of valid |
84 | * cpufreq frequencies. | |
d72b4015 VK |
85 | * @freq_table: Freq table in descending order of frequencies |
86 | * @cdev: thermal_cooling_device pointer to keep track of the | |
87 | * registered cooling device. | |
88 | * @policy: cpufreq policy. | |
fc4de356 | 89 | * @node: list_head to link all cpufreq_cooling_device together. |
81ee14da | 90 | * @idle_time: idle time stats |
c36cf071 | 91 | * @plat_get_static_power: callback to calculate the static power |
02361418 | 92 | * |
beca6053 VK |
93 | * This structure is required for keeping information of each registered |
94 | * cpufreq_cooling_device. | |
02361418 ADK |
95 | */ |
96 | struct cpufreq_cooling_device { | |
97 | int id; | |
d72b4015 | 98 | u32 last_load; |
02361418 | 99 | unsigned int cpufreq_state; |
59f0d218 | 100 | unsigned int clipped_freq; |
dcc6c7fd | 101 | unsigned int max_level; |
349d39dc | 102 | struct freq_table *freq_table; /* In descending order */ |
d72b4015 VK |
103 | struct thermal_cooling_device *cdev; |
104 | struct cpufreq_policy *policy; | |
2dcd851f | 105 | struct list_head node; |
81ee14da | 106 | struct time_in_idle *idle_time; |
c36cf071 | 107 | get_static_t plat_get_static_power; |
02361418 | 108 | }; |
02361418 | 109 | |
fb8ea308 | 110 | static DEFINE_IDA(cpufreq_ida); |
02373d7c | 111 | static DEFINE_MUTEX(cooling_list_lock); |
1dea432a | 112 | static LIST_HEAD(cpufreq_cdev_list); |
02361418 | 113 | |
02361418 ADK |
114 | /* Below code defines functions to be used for cpufreq as cooling device */ |
115 | ||
116 | /** | |
4843c4a1 | 117 | * get_level: Find the level for a particular frequency |
1dea432a | 118 | * @cpufreq_cdev: cpufreq_cdev for which the property is required |
4843c4a1 | 119 | * @freq: Frequency |
82b9ee40 | 120 | * |
da27f69d | 121 | * Return: level corresponding to the frequency. |
02361418 | 122 | */ |
1dea432a | 123 | static unsigned long get_level(struct cpufreq_cooling_device *cpufreq_cdev, |
4843c4a1 | 124 | unsigned int freq) |
02361418 | 125 | { |
da27f69d | 126 | struct freq_table *freq_table = cpufreq_cdev->freq_table; |
4843c4a1 | 127 | unsigned long level; |
a116776f | 128 | |
da27f69d VK |
129 | for (level = 1; level <= cpufreq_cdev->max_level; level++) |
130 | if (freq > freq_table[level].frequency) | |
4843c4a1 | 131 | break; |
02361418 | 132 | |
da27f69d | 133 | return level - 1; |
fc35b35c ZR |
134 | } |
135 | ||
02361418 ADK |
136 | /** |
137 | * cpufreq_thermal_notifier - notifier callback for cpufreq policy change. | |
138 | * @nb: struct notifier_block * with callback info. | |
139 | * @event: value showing cpufreq event for which this function invoked. | |
140 | * @data: callback-specific data | |
bab30554 | 141 | * |
9746b6e7 | 142 | * Callback to hijack the notification on cpufreq policy transition. |
bab30554 EV |
143 | * Every time there is a change in policy, we will intercept and |
144 | * update the cpufreq policy with thermal constraints. | |
145 | * | |
146 | * Return: 0 (success) | |
02361418 ADK |
147 | */ |
148 | static int cpufreq_thermal_notifier(struct notifier_block *nb, | |
5fda7f68 | 149 | unsigned long event, void *data) |
02361418 ADK |
150 | { |
151 | struct cpufreq_policy *policy = data; | |
abcbcc25 | 152 | unsigned long clipped_freq; |
1dea432a | 153 | struct cpufreq_cooling_device *cpufreq_cdev; |
02361418 | 154 | |
a24af233 VK |
155 | if (event != CPUFREQ_ADJUST) |
156 | return NOTIFY_DONE; | |
02361418 | 157 | |
a24af233 | 158 | mutex_lock(&cooling_list_lock); |
1dea432a | 159 | list_for_each_entry(cpufreq_cdev, &cpufreq_cdev_list, node) { |
ba76dd9d VK |
160 | /* |
161 | * A new copy of the policy is sent to the notifier and can't | |
162 | * compare that directly. | |
163 | */ | |
164 | if (policy->cpu != cpufreq_cdev->policy->cpu) | |
a24af233 | 165 | continue; |
c36cf071 | 166 | |
1afb9c53 VK |
167 | /* |
168 | * policy->max is the maximum allowed frequency defined by user | |
169 | * and clipped_freq is the maximum that thermal constraints | |
170 | * allow. | |
171 | * | |
172 | * If clipped_freq is lower than policy->max, then we need to | |
173 | * readjust policy->max. | |
174 | * | |
175 | * But, if clipped_freq is greater than policy->max, we don't | |
176 | * need to do anything. | |
177 | */ | |
1dea432a | 178 | clipped_freq = cpufreq_cdev->clipped_freq; |
c36cf071 | 179 | |
1afb9c53 | 180 | if (policy->max > clipped_freq) |
abcbcc25 | 181 | cpufreq_verify_within_limits(policy, 0, clipped_freq); |
c36cf071 | 182 | break; |
c36cf071 | 183 | } |
a24af233 | 184 | mutex_unlock(&cooling_list_lock); |
c36cf071 JM |
185 | |
186 | return NOTIFY_OK; | |
187 | } | |
188 | ||
189 | /** | |
349d39dc VK |
190 | * update_freq_table() - Update the freq table with power numbers |
191 | * @cpufreq_cdev: the cpufreq cooling device in which to update the table | |
c36cf071 JM |
192 | * @capacitance: dynamic power coefficient for these cpus |
193 | * | |
349d39dc VK |
194 | * Update the freq table with power numbers. This table will be used in |
195 | * cpu_power_to_freq() and cpu_freq_to_power() to convert between power and | |
196 | * frequency efficiently. Power is stored in mW, frequency in KHz. The | |
197 | * resulting table is in descending order. | |
c36cf071 | 198 | * |
459ac375 | 199 | * Return: 0 on success, -EINVAL if there are no OPPs for any CPUs, |
349d39dc | 200 | * or -ENOMEM if we run out of memory. |
c36cf071 | 201 | */ |
349d39dc VK |
202 | static int update_freq_table(struct cpufreq_cooling_device *cpufreq_cdev, |
203 | u32 capacitance) | |
c36cf071 | 204 | { |
349d39dc | 205 | struct freq_table *freq_table = cpufreq_cdev->freq_table; |
c36cf071 JM |
206 | struct dev_pm_opp *opp; |
207 | struct device *dev = NULL; | |
349d39dc | 208 | int num_opps = 0, cpu = cpufreq_cdev->policy->cpu, i; |
c36cf071 | 209 | |
02bacb21 VK |
210 | dev = get_cpu_device(cpu); |
211 | if (unlikely(!dev)) { | |
212 | dev_warn(&cpufreq_cdev->cdev->device, | |
213 | "No cpu device for cpu %d\n", cpu); | |
214 | return -ENODEV; | |
c36cf071 | 215 | } |
02361418 | 216 | |
02bacb21 VK |
217 | num_opps = dev_pm_opp_get_opp_count(dev); |
218 | if (num_opps < 0) | |
219 | return num_opps; | |
220 | ||
349d39dc VK |
221 | /* |
222 | * The cpufreq table is also built from the OPP table and so the count | |
223 | * should match. | |
224 | */ | |
225 | if (num_opps != cpufreq_cdev->max_level + 1) { | |
226 | dev_warn(dev, "Number of OPPs not matching with max_levels\n"); | |
459ac375 | 227 | return -EINVAL; |
349d39dc | 228 | } |
02361418 | 229 | |
349d39dc VK |
230 | for (i = 0; i <= cpufreq_cdev->max_level; i++) { |
231 | unsigned long freq = freq_table[i].frequency * 1000; | |
232 | u32 freq_mhz = freq_table[i].frequency / 1000; | |
c36cf071 | 233 | u64 power; |
349d39dc | 234 | u32 voltage_mv; |
c36cf071 | 235 | |
349d39dc VK |
236 | /* |
237 | * Find ceil frequency as 'freq' may be slightly lower than OPP | |
238 | * freq due to truncation while converting to kHz. | |
239 | */ | |
240 | opp = dev_pm_opp_find_freq_ceil(dev, &freq); | |
241 | if (IS_ERR(opp)) { | |
242 | dev_err(dev, "failed to get opp for %lu frequency\n", | |
243 | freq); | |
244 | return -EINVAL; | |
459ac375 JM |
245 | } |
246 | ||
c36cf071 | 247 | voltage_mv = dev_pm_opp_get_voltage(opp) / 1000; |
8a31d9d9 | 248 | dev_pm_opp_put(opp); |
c36cf071 JM |
249 | |
250 | /* | |
251 | * Do the multiplication with MHz and millivolt so as | |
252 | * to not overflow. | |
253 | */ | |
254 | power = (u64)capacitance * freq_mhz * voltage_mv * voltage_mv; | |
255 | do_div(power, 1000000000); | |
256 | ||
c36cf071 | 257 | /* power is stored in mW */ |
349d39dc | 258 | freq_table[i].power = power; |
eba4f88d | 259 | } |
c36cf071 | 260 | |
459ac375 | 261 | return 0; |
c36cf071 JM |
262 | } |
263 | ||
1dea432a | 264 | static u32 cpu_freq_to_power(struct cpufreq_cooling_device *cpufreq_cdev, |
c36cf071 JM |
265 | u32 freq) |
266 | { | |
267 | int i; | |
349d39dc | 268 | struct freq_table *freq_table = cpufreq_cdev->freq_table; |
c36cf071 | 269 | |
349d39dc VK |
270 | for (i = 1; i <= cpufreq_cdev->max_level; i++) |
271 | if (freq > freq_table[i].frequency) | |
c36cf071 JM |
272 | break; |
273 | ||
349d39dc | 274 | return freq_table[i - 1].power; |
c36cf071 JM |
275 | } |
276 | ||
1dea432a | 277 | static u32 cpu_power_to_freq(struct cpufreq_cooling_device *cpufreq_cdev, |
c36cf071 JM |
278 | u32 power) |
279 | { | |
280 | int i; | |
349d39dc | 281 | struct freq_table *freq_table = cpufreq_cdev->freq_table; |
c36cf071 | 282 | |
349d39dc VK |
283 | for (i = 1; i <= cpufreq_cdev->max_level; i++) |
284 | if (power > freq_table[i].power) | |
c36cf071 JM |
285 | break; |
286 | ||
349d39dc | 287 | return freq_table[i - 1].frequency; |
c36cf071 JM |
288 | } |
289 | ||
290 | /** | |
291 | * get_load() - get load for a cpu since last updated | |
1dea432a | 292 | * @cpufreq_cdev: &struct cpufreq_cooling_device for this cpu |
c36cf071 | 293 | * @cpu: cpu number |
ba76dd9d | 294 | * @cpu_idx: index of the cpu in time_in_idle* |
c36cf071 JM |
295 | * |
296 | * Return: The average load of cpu @cpu in percentage since this | |
297 | * function was last called. | |
298 | */ | |
1dea432a | 299 | static u32 get_load(struct cpufreq_cooling_device *cpufreq_cdev, int cpu, |
a53b8394 | 300 | int cpu_idx) |
c36cf071 JM |
301 | { |
302 | u32 load; | |
303 | u64 now, now_idle, delta_time, delta_idle; | |
81ee14da | 304 | struct time_in_idle *idle_time = &cpufreq_cdev->idle_time[cpu_idx]; |
c36cf071 JM |
305 | |
306 | now_idle = get_cpu_idle_time(cpu, &now, 0); | |
81ee14da VK |
307 | delta_idle = now_idle - idle_time->time; |
308 | delta_time = now - idle_time->timestamp; | |
c36cf071 JM |
309 | |
310 | if (delta_time <= delta_idle) | |
311 | load = 0; | |
312 | else | |
313 | load = div64_u64(100 * (delta_time - delta_idle), delta_time); | |
314 | ||
81ee14da VK |
315 | idle_time->time = now_idle; |
316 | idle_time->timestamp = now; | |
c36cf071 JM |
317 | |
318 | return load; | |
319 | } | |
320 | ||
321 | /** | |
322 | * get_static_power() - calculate the static power consumed by the cpus | |
1dea432a | 323 | * @cpufreq_cdev: struct &cpufreq_cooling_device for this cpu cdev |
c36cf071 JM |
324 | * @tz: thermal zone device in which we're operating |
325 | * @freq: frequency in KHz | |
326 | * @power: pointer in which to store the calculated static power | |
327 | * | |
328 | * Calculate the static power consumed by the cpus described by | |
329 | * @cpu_actor running at frequency @freq. This function relies on a | |
330 | * platform specific function that should have been provided when the | |
331 | * actor was registered. If it wasn't, the static power is assumed to | |
332 | * be negligible. The calculated static power is stored in @power. | |
333 | * | |
334 | * Return: 0 on success, -E* on failure. | |
335 | */ | |
1dea432a | 336 | static int get_static_power(struct cpufreq_cooling_device *cpufreq_cdev, |
c36cf071 JM |
337 | struct thermal_zone_device *tz, unsigned long freq, |
338 | u32 *power) | |
339 | { | |
340 | struct dev_pm_opp *opp; | |
341 | unsigned long voltage; | |
53ca1ece VK |
342 | struct cpufreq_policy *policy = cpufreq_cdev->policy; |
343 | struct cpumask *cpumask = policy->related_cpus; | |
c36cf071 | 344 | unsigned long freq_hz = freq * 1000; |
53ca1ece | 345 | struct device *dev; |
c36cf071 | 346 | |
53ca1ece | 347 | if (!cpufreq_cdev->plat_get_static_power) { |
c36cf071 JM |
348 | *power = 0; |
349 | return 0; | |
350 | } | |
351 | ||
53ca1ece VK |
352 | dev = get_cpu_device(policy->cpu); |
353 | WARN_ON(!dev); | |
354 | ||
355 | opp = dev_pm_opp_find_freq_exact(dev, freq_hz, true); | |
3ea3217c | 356 | if (IS_ERR(opp)) { |
53ca1ece | 357 | dev_warn_ratelimited(dev, "Failed to find OPP for frequency %lu: %ld\n", |
3ea3217c VK |
358 | freq_hz, PTR_ERR(opp)); |
359 | return -EINVAL; | |
360 | } | |
361 | ||
c36cf071 | 362 | voltage = dev_pm_opp_get_voltage(opp); |
8a31d9d9 | 363 | dev_pm_opp_put(opp); |
c36cf071 JM |
364 | |
365 | if (voltage == 0) { | |
53ca1ece | 366 | dev_err_ratelimited(dev, "Failed to get voltage for frequency %lu\n", |
3ea3217c | 367 | freq_hz); |
c36cf071 JM |
368 | return -EINVAL; |
369 | } | |
370 | ||
1dea432a VK |
371 | return cpufreq_cdev->plat_get_static_power(cpumask, tz->passive_delay, |
372 | voltage, power); | |
c36cf071 JM |
373 | } |
374 | ||
375 | /** | |
376 | * get_dynamic_power() - calculate the dynamic power | |
1dea432a | 377 | * @cpufreq_cdev: &cpufreq_cooling_device for this cdev |
c36cf071 JM |
378 | * @freq: current frequency |
379 | * | |
380 | * Return: the dynamic power consumed by the cpus described by | |
1dea432a | 381 | * @cpufreq_cdev. |
c36cf071 | 382 | */ |
1dea432a | 383 | static u32 get_dynamic_power(struct cpufreq_cooling_device *cpufreq_cdev, |
c36cf071 JM |
384 | unsigned long freq) |
385 | { | |
386 | u32 raw_cpu_power; | |
387 | ||
1dea432a VK |
388 | raw_cpu_power = cpu_freq_to_power(cpufreq_cdev, freq); |
389 | return (raw_cpu_power * cpufreq_cdev->last_load) / 100; | |
02361418 ADK |
390 | } |
391 | ||
1b9e3526 | 392 | /* cpufreq cooling device callback functions are defined below */ |
02361418 ADK |
393 | |
394 | /** | |
395 | * cpufreq_get_max_state - callback function to get the max cooling state. | |
396 | * @cdev: thermal cooling device pointer. | |
397 | * @state: fill this variable with the max cooling state. | |
62c00421 EV |
398 | * |
399 | * Callback for the thermal cooling device to return the cpufreq | |
400 | * max cooling state. | |
401 | * | |
402 | * Return: 0 on success, an error code otherwise. | |
02361418 ADK |
403 | */ |
404 | static int cpufreq_get_max_state(struct thermal_cooling_device *cdev, | |
405 | unsigned long *state) | |
406 | { | |
1dea432a | 407 | struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata; |
9c51b05a | 408 | |
1dea432a | 409 | *state = cpufreq_cdev->max_level; |
dcc6c7fd | 410 | return 0; |
02361418 ADK |
411 | } |
412 | ||
413 | /** | |
414 | * cpufreq_get_cur_state - callback function to get the current cooling state. | |
415 | * @cdev: thermal cooling device pointer. | |
416 | * @state: fill this variable with the current cooling state. | |
3672552d EV |
417 | * |
418 | * Callback for the thermal cooling device to return the cpufreq | |
419 | * current cooling state. | |
420 | * | |
421 | * Return: 0 on success, an error code otherwise. | |
02361418 ADK |
422 | */ |
423 | static int cpufreq_get_cur_state(struct thermal_cooling_device *cdev, | |
424 | unsigned long *state) | |
425 | { | |
1dea432a | 426 | struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata; |
02361418 | 427 | |
1dea432a | 428 | *state = cpufreq_cdev->cpufreq_state; |
79491e53 | 429 | |
160b7d80 | 430 | return 0; |
02361418 ADK |
431 | } |
432 | ||
433 | /** | |
434 | * cpufreq_set_cur_state - callback function to set the current cooling state. | |
435 | * @cdev: thermal cooling device pointer. | |
436 | * @state: set this variable to the current cooling state. | |
56e05fdb EV |
437 | * |
438 | * Callback for the thermal cooling device to change the cpufreq | |
439 | * current cooling state. | |
440 | * | |
441 | * Return: 0 on success, an error code otherwise. | |
02361418 ADK |
442 | */ |
443 | static int cpufreq_set_cur_state(struct thermal_cooling_device *cdev, | |
444 | unsigned long state) | |
445 | { | |
1dea432a | 446 | struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata; |
5194fe46 | 447 | unsigned int clip_freq; |
4843c4a1 VK |
448 | |
449 | /* Request state should be less than max_level */ | |
1dea432a | 450 | if (WARN_ON(state > cpufreq_cdev->max_level)) |
4843c4a1 | 451 | return -EINVAL; |
5194fe46 VK |
452 | |
453 | /* Check if the old cooling action is same as new cooling action */ | |
1dea432a | 454 | if (cpufreq_cdev->cpufreq_state == state) |
5194fe46 | 455 | return 0; |
02361418 | 456 | |
349d39dc | 457 | clip_freq = cpufreq_cdev->freq_table[state].frequency; |
1dea432a VK |
458 | cpufreq_cdev->cpufreq_state = state; |
459 | cpufreq_cdev->clipped_freq = clip_freq; | |
5194fe46 | 460 | |
ba76dd9d | 461 | cpufreq_update_policy(cpufreq_cdev->policy->cpu); |
5194fe46 VK |
462 | |
463 | return 0; | |
02361418 ADK |
464 | } |
465 | ||
c36cf071 JM |
466 | /** |
467 | * cpufreq_get_requested_power() - get the current power | |
468 | * @cdev: &thermal_cooling_device pointer | |
469 | * @tz: a valid thermal zone device pointer | |
470 | * @power: pointer in which to store the resulting power | |
471 | * | |
472 | * Calculate the current power consumption of the cpus in milliwatts | |
473 | * and store it in @power. This function should actually calculate | |
474 | * the requested power, but it's hard to get the frequency that | |
475 | * cpufreq would have assigned if there were no thermal limits. | |
476 | * Instead, we calculate the current power on the assumption that the | |
477 | * immediate future will look like the immediate past. | |
478 | * | |
479 | * We use the current frequency and the average load since this | |
480 | * function was last called. In reality, there could have been | |
481 | * multiple opps since this function was last called and that affects | |
482 | * the load calculation. While it's not perfectly accurate, this | |
483 | * simplification is good enough and works. REVISIT this, as more | |
484 | * complex code may be needed if experiments show that it's not | |
485 | * accurate enough. | |
486 | * | |
487 | * Return: 0 on success, -E* if getting the static power failed. | |
488 | */ | |
489 | static int cpufreq_get_requested_power(struct thermal_cooling_device *cdev, | |
490 | struct thermal_zone_device *tz, | |
491 | u32 *power) | |
492 | { | |
493 | unsigned long freq; | |
6828a471 | 494 | int i = 0, cpu, ret; |
c36cf071 | 495 | u32 static_power, dynamic_power, total_load = 0; |
1dea432a | 496 | struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata; |
ba76dd9d | 497 | struct cpufreq_policy *policy = cpufreq_cdev->policy; |
6828a471 | 498 | u32 *load_cpu = NULL; |
c36cf071 | 499 | |
ba76dd9d | 500 | freq = cpufreq_quick_get(policy->cpu); |
c36cf071 | 501 | |
6828a471 | 502 | if (trace_thermal_power_cpu_get_power_enabled()) { |
ba76dd9d | 503 | u32 ncpus = cpumask_weight(policy->related_cpus); |
6828a471 | 504 | |
a71544cd | 505 | load_cpu = kcalloc(ncpus, sizeof(*load_cpu), GFP_KERNEL); |
6828a471 JM |
506 | } |
507 | ||
ba76dd9d | 508 | for_each_cpu(cpu, policy->related_cpus) { |
c36cf071 JM |
509 | u32 load; |
510 | ||
511 | if (cpu_online(cpu)) | |
1dea432a | 512 | load = get_load(cpufreq_cdev, cpu, i); |
c36cf071 JM |
513 | else |
514 | load = 0; | |
515 | ||
516 | total_load += load; | |
6828a471 JM |
517 | if (trace_thermal_power_cpu_limit_enabled() && load_cpu) |
518 | load_cpu[i] = load; | |
519 | ||
520 | i++; | |
c36cf071 JM |
521 | } |
522 | ||
1dea432a | 523 | cpufreq_cdev->last_load = total_load; |
c36cf071 | 524 | |
1dea432a VK |
525 | dynamic_power = get_dynamic_power(cpufreq_cdev, freq); |
526 | ret = get_static_power(cpufreq_cdev, tz, freq, &static_power); | |
6828a471 | 527 | if (ret) { |
a71544cd | 528 | kfree(load_cpu); |
c36cf071 | 529 | return ret; |
6828a471 JM |
530 | } |
531 | ||
532 | if (load_cpu) { | |
ba76dd9d VK |
533 | trace_thermal_power_cpu_get_power(policy->related_cpus, freq, |
534 | load_cpu, i, dynamic_power, | |
535 | static_power); | |
6828a471 | 536 | |
a71544cd | 537 | kfree(load_cpu); |
6828a471 | 538 | } |
c36cf071 JM |
539 | |
540 | *power = static_power + dynamic_power; | |
541 | return 0; | |
542 | } | |
543 | ||
544 | /** | |
545 | * cpufreq_state2power() - convert a cpu cdev state to power consumed | |
546 | * @cdev: &thermal_cooling_device pointer | |
547 | * @tz: a valid thermal zone device pointer | |
548 | * @state: cooling device state to be converted | |
549 | * @power: pointer in which to store the resulting power | |
550 | * | |
551 | * Convert cooling device state @state into power consumption in | |
552 | * milliwatts assuming 100% load. Store the calculated power in | |
553 | * @power. | |
554 | * | |
555 | * Return: 0 on success, -EINVAL if the cooling device state could not | |
556 | * be converted into a frequency or other -E* if there was an error | |
557 | * when calculating the static power. | |
558 | */ | |
559 | static int cpufreq_state2power(struct thermal_cooling_device *cdev, | |
560 | struct thermal_zone_device *tz, | |
561 | unsigned long state, u32 *power) | |
562 | { | |
563 | unsigned int freq, num_cpus; | |
c36cf071 JM |
564 | u32 static_power, dynamic_power; |
565 | int ret; | |
1dea432a | 566 | struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata; |
c36cf071 | 567 | |
cb1b6318 VK |
568 | /* Request state should be less than max_level */ |
569 | if (WARN_ON(state > cpufreq_cdev->max_level)) | |
570 | return -EINVAL; | |
571 | ||
ba76dd9d | 572 | num_cpus = cpumask_weight(cpufreq_cdev->policy->cpus); |
c36cf071 | 573 | |
349d39dc | 574 | freq = cpufreq_cdev->freq_table[state].frequency; |
1dea432a VK |
575 | dynamic_power = cpu_freq_to_power(cpufreq_cdev, freq) * num_cpus; |
576 | ret = get_static_power(cpufreq_cdev, tz, freq, &static_power); | |
c36cf071 | 577 | if (ret) |
ba76dd9d | 578 | return ret; |
c36cf071 JM |
579 | |
580 | *power = static_power + dynamic_power; | |
d9cc34a6 | 581 | return ret; |
c36cf071 JM |
582 | } |
583 | ||
584 | /** | |
585 | * cpufreq_power2state() - convert power to a cooling device state | |
586 | * @cdev: &thermal_cooling_device pointer | |
587 | * @tz: a valid thermal zone device pointer | |
588 | * @power: power in milliwatts to be converted | |
589 | * @state: pointer in which to store the resulting state | |
590 | * | |
591 | * Calculate a cooling device state for the cpus described by @cdev | |
592 | * that would allow them to consume at most @power mW and store it in | |
593 | * @state. Note that this calculation depends on external factors | |
594 | * such as the cpu load or the current static power. Calling this | |
595 | * function with the same power as input can yield different cooling | |
596 | * device states depending on those external factors. | |
597 | * | |
598 | * Return: 0 on success, -ENODEV if no cpus are online or -EINVAL if | |
599 | * the calculated frequency could not be converted to a valid state. | |
600 | * The latter should not happen unless the frequencies available to | |
601 | * cpufreq have changed since the initialization of the cpu cooling | |
602 | * device. | |
603 | */ | |
604 | static int cpufreq_power2state(struct thermal_cooling_device *cdev, | |
605 | struct thermal_zone_device *tz, u32 power, | |
606 | unsigned long *state) | |
607 | { | |
ba76dd9d | 608 | unsigned int cur_freq, target_freq; |
c36cf071 JM |
609 | int ret; |
610 | s32 dyn_power; | |
611 | u32 last_load, normalised_power, static_power; | |
1dea432a | 612 | struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata; |
ba76dd9d | 613 | struct cpufreq_policy *policy = cpufreq_cdev->policy; |
c36cf071 | 614 | |
ba76dd9d | 615 | cur_freq = cpufreq_quick_get(policy->cpu); |
1dea432a | 616 | ret = get_static_power(cpufreq_cdev, tz, cur_freq, &static_power); |
c36cf071 JM |
617 | if (ret) |
618 | return ret; | |
619 | ||
620 | dyn_power = power - static_power; | |
621 | dyn_power = dyn_power > 0 ? dyn_power : 0; | |
1dea432a | 622 | last_load = cpufreq_cdev->last_load ?: 1; |
c36cf071 | 623 | normalised_power = (dyn_power * 100) / last_load; |
1dea432a | 624 | target_freq = cpu_power_to_freq(cpufreq_cdev, normalised_power); |
c36cf071 | 625 | |
3e08b2df | 626 | *state = get_level(cpufreq_cdev, target_freq); |
ba76dd9d VK |
627 | trace_thermal_power_cpu_limit(policy->related_cpus, target_freq, *state, |
628 | power); | |
c36cf071 JM |
629 | return 0; |
630 | } | |
631 | ||
02361418 | 632 | /* Bind cpufreq callbacks to thermal cooling device ops */ |
a305a438 | 633 | |
c36cf071 | 634 | static struct thermal_cooling_device_ops cpufreq_cooling_ops = { |
02361418 ADK |
635 | .get_max_state = cpufreq_get_max_state, |
636 | .get_cur_state = cpufreq_get_cur_state, | |
637 | .set_cur_state = cpufreq_set_cur_state, | |
638 | }; | |
639 | ||
a305a438 BJ |
640 | static struct thermal_cooling_device_ops cpufreq_power_cooling_ops = { |
641 | .get_max_state = cpufreq_get_max_state, | |
642 | .get_cur_state = cpufreq_get_cur_state, | |
643 | .set_cur_state = cpufreq_set_cur_state, | |
644 | .get_requested_power = cpufreq_get_requested_power, | |
645 | .state2power = cpufreq_state2power, | |
646 | .power2state = cpufreq_power2state, | |
647 | }; | |
648 | ||
02361418 ADK |
649 | /* Notifier for cpufreq policy change */ |
650 | static struct notifier_block thermal_cpufreq_notifier_block = { | |
651 | .notifier_call = cpufreq_thermal_notifier, | |
652 | }; | |
653 | ||
f6859014 VK |
654 | static unsigned int find_next_max(struct cpufreq_frequency_table *table, |
655 | unsigned int prev_max) | |
656 | { | |
657 | struct cpufreq_frequency_table *pos; | |
658 | unsigned int max = 0; | |
659 | ||
660 | cpufreq_for_each_valid_entry(pos, table) { | |
661 | if (pos->frequency > max && pos->frequency < prev_max) | |
662 | max = pos->frequency; | |
663 | } | |
664 | ||
665 | return max; | |
666 | } | |
667 | ||
02361418 | 668 | /** |
39d99cff EV |
669 | * __cpufreq_cooling_register - helper function to create cpufreq cooling device |
670 | * @np: a valid struct device_node to the cooling device device tree node | |
4d753aa7 | 671 | * @policy: cpufreq policy |
405fb825 | 672 | * Normally this should be same as cpufreq policy->related_cpus. |
c36cf071 JM |
673 | * @capacitance: dynamic power coefficient for these cpus |
674 | * @plat_static_func: function to calculate the static power consumed by these | |
675 | * cpus (optional) | |
12cb08ba EV |
676 | * |
677 | * This interface function registers the cpufreq cooling device with the name | |
678 | * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq | |
39d99cff EV |
679 | * cooling devices. It also gives the opportunity to link the cooling device |
680 | * with a device tree node, in order to bind it via the thermal DT code. | |
12cb08ba EV |
681 | * |
682 | * Return: a valid struct thermal_cooling_device pointer on success, | |
683 | * on failure, it returns a corresponding ERR_PTR(). | |
02361418 | 684 | */ |
39d99cff EV |
685 | static struct thermal_cooling_device * |
686 | __cpufreq_cooling_register(struct device_node *np, | |
4d753aa7 | 687 | struct cpufreq_policy *policy, u32 capacitance, |
c36cf071 | 688 | get_static_t plat_static_func) |
02361418 | 689 | { |
04bdbdf9 | 690 | struct thermal_cooling_device *cdev; |
1dea432a | 691 | struct cpufreq_cooling_device *cpufreq_cdev; |
02361418 | 692 | char dev_name[THERMAL_NAME_LENGTH]; |
c36cf071 | 693 | unsigned int freq, i, num_cpus; |
405fb825 | 694 | int ret; |
a305a438 | 695 | struct thermal_cooling_device_ops *cooling_ops; |
088db931 | 696 | bool first; |
02361418 | 697 | |
4d753aa7 VK |
698 | if (IS_ERR_OR_NULL(policy)) { |
699 | pr_err("%s: cpufreq policy isn't valid: %p", __func__, policy); | |
700 | return ERR_PTR(-EINVAL); | |
f8bfc116 VK |
701 | } |
702 | ||
55d85293 VK |
703 | i = cpufreq_table_count_valid_entries(policy); |
704 | if (!i) { | |
705 | pr_debug("%s: CPUFreq table not found or has no valid entries\n", | |
706 | __func__); | |
4d753aa7 | 707 | return ERR_PTR(-ENODEV); |
02361418 | 708 | } |
0f1be51c | 709 | |
1dea432a | 710 | cpufreq_cdev = kzalloc(sizeof(*cpufreq_cdev), GFP_KERNEL); |
4d753aa7 VK |
711 | if (!cpufreq_cdev) |
712 | return ERR_PTR(-ENOMEM); | |
02361418 | 713 | |
b12b6519 | 714 | cpufreq_cdev->policy = policy; |
4d753aa7 | 715 | num_cpus = cpumask_weight(policy->related_cpus); |
81ee14da VK |
716 | cpufreq_cdev->idle_time = kcalloc(num_cpus, |
717 | sizeof(*cpufreq_cdev->idle_time), | |
718 | GFP_KERNEL); | |
719 | if (!cpufreq_cdev->idle_time) { | |
04bdbdf9 | 720 | cdev = ERR_PTR(-ENOMEM); |
c36cf071 JM |
721 | goto free_cdev; |
722 | } | |
723 | ||
55d85293 VK |
724 | /* max_level is an index, not a counter */ |
725 | cpufreq_cdev->max_level = i - 1; | |
dcc6c7fd | 726 | |
f19b1a17 VK |
727 | cpufreq_cdev->freq_table = kmalloc_array(i, |
728 | sizeof(*cpufreq_cdev->freq_table), | |
729 | GFP_KERNEL); | |
1dea432a | 730 | if (!cpufreq_cdev->freq_table) { |
04bdbdf9 | 731 | cdev = ERR_PTR(-ENOMEM); |
81ee14da | 732 | goto free_idle_time; |
f6859014 VK |
733 | } |
734 | ||
ae606089 MW |
735 | ret = ida_simple_get(&cpufreq_ida, 0, 0, GFP_KERNEL); |
736 | if (ret < 0) { | |
04bdbdf9 | 737 | cdev = ERR_PTR(ret); |
349d39dc | 738 | goto free_table; |
02361418 | 739 | } |
1dea432a | 740 | cpufreq_cdev->id = ret; |
02361418 | 741 | |
349d39dc VK |
742 | snprintf(dev_name, sizeof(dev_name), "thermal-cpufreq-%d", |
743 | cpufreq_cdev->id); | |
744 | ||
f6859014 | 745 | /* Fill freq-table in descending order of frequencies */ |
1dea432a | 746 | for (i = 0, freq = -1; i <= cpufreq_cdev->max_level; i++) { |
55d85293 | 747 | freq = find_next_max(policy->freq_table, freq); |
349d39dc | 748 | cpufreq_cdev->freq_table[i].frequency = freq; |
f6859014 VK |
749 | |
750 | /* Warn for duplicate entries */ | |
751 | if (!freq) | |
752 | pr_warn("%s: table has duplicate entries\n", __func__); | |
753 | else | |
754 | pr_debug("%s: freq:%u KHz\n", __func__, freq); | |
02361418 | 755 | } |
f6859014 | 756 | |
349d39dc VK |
757 | if (capacitance) { |
758 | cpufreq_cdev->plat_get_static_power = plat_static_func; | |
759 | ||
760 | ret = update_freq_table(cpufreq_cdev, capacitance); | |
761 | if (ret) { | |
762 | cdev = ERR_PTR(ret); | |
763 | goto remove_ida; | |
764 | } | |
765 | ||
766 | cooling_ops = &cpufreq_power_cooling_ops; | |
767 | } else { | |
768 | cooling_ops = &cpufreq_cooling_ops; | |
769 | } | |
f840ab18 | 770 | |
04bdbdf9 VK |
771 | cdev = thermal_of_cooling_device_register(np, dev_name, cpufreq_cdev, |
772 | cooling_ops); | |
773 | if (IS_ERR(cdev)) | |
ae606089 | 774 | goto remove_ida; |
f840ab18 | 775 | |
349d39dc | 776 | cpufreq_cdev->clipped_freq = cpufreq_cdev->freq_table[0].frequency; |
04bdbdf9 | 777 | cpufreq_cdev->cdev = cdev; |
92e615ec | 778 | |
02373d7c | 779 | mutex_lock(&cooling_list_lock); |
088db931 | 780 | /* Register the notifier for first cpufreq cooling device */ |
1dea432a VK |
781 | first = list_empty(&cpufreq_cdev_list); |
782 | list_add(&cpufreq_cdev->node, &cpufreq_cdev_list); | |
088db931 | 783 | mutex_unlock(&cooling_list_lock); |
02373d7c | 784 | |
088db931 | 785 | if (first) |
02361418 | 786 | cpufreq_register_notifier(&thermal_cpufreq_notifier_block, |
5fda7f68 | 787 | CPUFREQ_POLICY_NOTIFIER); |
79491e53 | 788 | |
4d753aa7 | 789 | return cdev; |
730abe06 | 790 | |
ae606089 | 791 | remove_ida: |
1dea432a | 792 | ida_simple_remove(&cpufreq_ida, cpufreq_cdev->id); |
f6859014 | 793 | free_table: |
1dea432a | 794 | kfree(cpufreq_cdev->freq_table); |
81ee14da VK |
795 | free_idle_time: |
796 | kfree(cpufreq_cdev->idle_time); | |
730abe06 | 797 | free_cdev: |
1dea432a | 798 | kfree(cpufreq_cdev); |
04bdbdf9 | 799 | return cdev; |
02361418 | 800 | } |
39d99cff EV |
801 | |
802 | /** | |
803 | * cpufreq_cooling_register - function to create cpufreq cooling device. | |
4d753aa7 | 804 | * @policy: cpufreq policy |
39d99cff EV |
805 | * |
806 | * This interface function registers the cpufreq cooling device with the name | |
807 | * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq | |
808 | * cooling devices. | |
809 | * | |
810 | * Return: a valid struct thermal_cooling_device pointer on success, | |
811 | * on failure, it returns a corresponding ERR_PTR(). | |
812 | */ | |
813 | struct thermal_cooling_device * | |
4d753aa7 | 814 | cpufreq_cooling_register(struct cpufreq_policy *policy) |
39d99cff | 815 | { |
4d753aa7 | 816 | return __cpufreq_cooling_register(NULL, policy, 0, NULL); |
39d99cff | 817 | } |
243dbd9c | 818 | EXPORT_SYMBOL_GPL(cpufreq_cooling_register); |
02361418 | 819 | |
39d99cff EV |
820 | /** |
821 | * of_cpufreq_cooling_register - function to create cpufreq cooling device. | |
822 | * @np: a valid struct device_node to the cooling device device tree node | |
4d753aa7 | 823 | * @policy: cpufreq policy |
39d99cff EV |
824 | * |
825 | * This interface function registers the cpufreq cooling device with the name | |
826 | * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq | |
827 | * cooling devices. Using this API, the cpufreq cooling device will be | |
828 | * linked to the device tree node provided. | |
829 | * | |
830 | * Return: a valid struct thermal_cooling_device pointer on success, | |
831 | * on failure, it returns a corresponding ERR_PTR(). | |
832 | */ | |
833 | struct thermal_cooling_device * | |
834 | of_cpufreq_cooling_register(struct device_node *np, | |
4d753aa7 | 835 | struct cpufreq_policy *policy) |
39d99cff EV |
836 | { |
837 | if (!np) | |
838 | return ERR_PTR(-EINVAL); | |
839 | ||
4d753aa7 | 840 | return __cpufreq_cooling_register(np, policy, 0, NULL); |
39d99cff EV |
841 | } |
842 | EXPORT_SYMBOL_GPL(of_cpufreq_cooling_register); | |
843 | ||
c36cf071 JM |
844 | /** |
845 | * cpufreq_power_cooling_register() - create cpufreq cooling device with power extensions | |
4d753aa7 | 846 | * @policy: cpufreq policy |
c36cf071 JM |
847 | * @capacitance: dynamic power coefficient for these cpus |
848 | * @plat_static_func: function to calculate the static power consumed by these | |
849 | * cpus (optional) | |
850 | * | |
851 | * This interface function registers the cpufreq cooling device with | |
852 | * the name "thermal-cpufreq-%x". This api can support multiple | |
853 | * instances of cpufreq cooling devices. Using this function, the | |
854 | * cooling device will implement the power extensions by using a | |
855 | * simple cpu power model. The cpus must have registered their OPPs | |
856 | * using the OPP library. | |
857 | * | |
858 | * An optional @plat_static_func may be provided to calculate the | |
859 | * static power consumed by these cpus. If the platform's static | |
860 | * power consumption is unknown or negligible, make it NULL. | |
861 | * | |
862 | * Return: a valid struct thermal_cooling_device pointer on success, | |
863 | * on failure, it returns a corresponding ERR_PTR(). | |
864 | */ | |
865 | struct thermal_cooling_device * | |
4d753aa7 | 866 | cpufreq_power_cooling_register(struct cpufreq_policy *policy, u32 capacitance, |
c36cf071 JM |
867 | get_static_t plat_static_func) |
868 | { | |
4d753aa7 | 869 | return __cpufreq_cooling_register(NULL, policy, capacitance, |
c36cf071 JM |
870 | plat_static_func); |
871 | } | |
872 | EXPORT_SYMBOL(cpufreq_power_cooling_register); | |
873 | ||
874 | /** | |
875 | * of_cpufreq_power_cooling_register() - create cpufreq cooling device with power extensions | |
876 | * @np: a valid struct device_node to the cooling device device tree node | |
4d753aa7 | 877 | * @policy: cpufreq policy |
c36cf071 JM |
878 | * @capacitance: dynamic power coefficient for these cpus |
879 | * @plat_static_func: function to calculate the static power consumed by these | |
880 | * cpus (optional) | |
881 | * | |
882 | * This interface function registers the cpufreq cooling device with | |
883 | * the name "thermal-cpufreq-%x". This api can support multiple | |
884 | * instances of cpufreq cooling devices. Using this API, the cpufreq | |
885 | * cooling device will be linked to the device tree node provided. | |
886 | * Using this function, the cooling device will implement the power | |
887 | * extensions by using a simple cpu power model. The cpus must have | |
888 | * registered their OPPs using the OPP library. | |
889 | * | |
890 | * An optional @plat_static_func may be provided to calculate the | |
891 | * static power consumed by these cpus. If the platform's static | |
892 | * power consumption is unknown or negligible, make it NULL. | |
893 | * | |
894 | * Return: a valid struct thermal_cooling_device pointer on success, | |
895 | * on failure, it returns a corresponding ERR_PTR(). | |
896 | */ | |
897 | struct thermal_cooling_device * | |
898 | of_cpufreq_power_cooling_register(struct device_node *np, | |
4d753aa7 | 899 | struct cpufreq_policy *policy, |
c36cf071 JM |
900 | u32 capacitance, |
901 | get_static_t plat_static_func) | |
902 | { | |
903 | if (!np) | |
904 | return ERR_PTR(-EINVAL); | |
905 | ||
4d753aa7 | 906 | return __cpufreq_cooling_register(np, policy, capacitance, |
c36cf071 JM |
907 | plat_static_func); |
908 | } | |
909 | EXPORT_SYMBOL(of_cpufreq_power_cooling_register); | |
910 | ||
02361418 ADK |
911 | /** |
912 | * cpufreq_cooling_unregister - function to remove cpufreq cooling device. | |
913 | * @cdev: thermal cooling device pointer. | |
135266b4 EV |
914 | * |
915 | * This interface function unregisters the "thermal-cpufreq-%x" cooling device. | |
02361418 ADK |
916 | */ |
917 | void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev) | |
918 | { | |
1dea432a | 919 | struct cpufreq_cooling_device *cpufreq_cdev; |
088db931 | 920 | bool last; |
02361418 | 921 | |
50e66c7e EV |
922 | if (!cdev) |
923 | return; | |
924 | ||
1dea432a | 925 | cpufreq_cdev = cdev->devdata; |
02361418 | 926 | |
ae606089 | 927 | mutex_lock(&cooling_list_lock); |
1dea432a | 928 | list_del(&cpufreq_cdev->node); |
02361418 | 929 | /* Unregister the notifier for the last cpufreq cooling device */ |
1dea432a | 930 | last = list_empty(&cpufreq_cdev_list); |
088db931 MW |
931 | mutex_unlock(&cooling_list_lock); |
932 | ||
933 | if (last) | |
02361418 | 934 | cpufreq_unregister_notifier(&thermal_cpufreq_notifier_block, |
5fda7f68 | 935 | CPUFREQ_POLICY_NOTIFIER); |
02373d7c | 936 | |
04bdbdf9 | 937 | thermal_cooling_device_unregister(cpufreq_cdev->cdev); |
1dea432a | 938 | ida_simple_remove(&cpufreq_ida, cpufreq_cdev->id); |
81ee14da | 939 | kfree(cpufreq_cdev->idle_time); |
1dea432a VK |
940 | kfree(cpufreq_cdev->freq_table); |
941 | kfree(cpufreq_cdev); | |
02361418 | 942 | } |
243dbd9c | 943 | EXPORT_SYMBOL_GPL(cpufreq_cooling_unregister); |