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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. | |
04bdbdf9 | 78 | * @cdev: thermal_cooling_device pointer to keep track of the |
3b3c0748 | 79 | * registered cooling device. |
b12b6519 | 80 | * @policy: cpufreq policy. |
02361418 ADK |
81 | * @cpufreq_state: integer value representing the current state of cpufreq |
82 | * cooling devices. | |
59f0d218 | 83 | * @clipped_freq: integer value representing the absolute value of the clipped |
02361418 | 84 | * frequency. |
dcc6c7fd VK |
85 | * @max_level: maximum cooling level. One less than total number of valid |
86 | * cpufreq frequencies. | |
fc4de356 | 87 | * @node: list_head to link all cpufreq_cooling_device together. |
0744f130 | 88 | * @last_load: load measured by the latest call to cpufreq_get_requested_power() |
81ee14da | 89 | * @idle_time: idle time stats |
02bacb21 | 90 | * @cpu_dev: the cpu_device of policy->cpu. |
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; | |
04bdbdf9 | 98 | struct thermal_cooling_device *cdev; |
b12b6519 | 99 | struct cpufreq_policy *policy; |
02361418 | 100 | unsigned int cpufreq_state; |
59f0d218 | 101 | unsigned int clipped_freq; |
dcc6c7fd | 102 | unsigned int max_level; |
349d39dc | 103 | struct freq_table *freq_table; /* In descending order */ |
2dcd851f | 104 | struct list_head node; |
c36cf071 | 105 | u32 last_load; |
81ee14da | 106 | struct time_in_idle *idle_time; |
c36cf071 JM |
107 | struct device *cpu_dev; |
108 | get_static_t plat_get_static_power; | |
02361418 | 109 | }; |
02361418 | 110 | |
fb8ea308 | 111 | static DEFINE_IDA(cpufreq_ida); |
02373d7c | 112 | static DEFINE_MUTEX(cooling_list_lock); |
1dea432a | 113 | static LIST_HEAD(cpufreq_cdev_list); |
02361418 | 114 | |
02361418 ADK |
115 | /* Below code defines functions to be used for cpufreq as cooling device */ |
116 | ||
117 | /** | |
4843c4a1 | 118 | * get_level: Find the level for a particular frequency |
1dea432a | 119 | * @cpufreq_cdev: cpufreq_cdev for which the property is required |
4843c4a1 | 120 | * @freq: Frequency |
82b9ee40 | 121 | * |
4843c4a1 | 122 | * Return: level on success, THERMAL_CSTATE_INVALID on error. |
02361418 | 123 | */ |
1dea432a | 124 | static unsigned long get_level(struct cpufreq_cooling_device *cpufreq_cdev, |
4843c4a1 | 125 | unsigned int freq) |
02361418 | 126 | { |
4843c4a1 | 127 | unsigned long level; |
a116776f | 128 | |
1dea432a | 129 | for (level = 0; level <= cpufreq_cdev->max_level; level++) { |
349d39dc | 130 | if (freq == cpufreq_cdev->freq_table[level].frequency) |
4843c4a1 | 131 | return level; |
02361418 | 132 | |
349d39dc | 133 | if (freq > cpufreq_cdev->freq_table[level].frequency) |
4843c4a1 | 134 | break; |
fc35b35c | 135 | } |
02361418 | 136 | |
4843c4a1 | 137 | return THERMAL_CSTATE_INVALID; |
fc35b35c ZR |
138 | } |
139 | ||
02361418 ADK |
140 | /** |
141 | * cpufreq_thermal_notifier - notifier callback for cpufreq policy change. | |
142 | * @nb: struct notifier_block * with callback info. | |
143 | * @event: value showing cpufreq event for which this function invoked. | |
144 | * @data: callback-specific data | |
bab30554 | 145 | * |
9746b6e7 | 146 | * Callback to hijack the notification on cpufreq policy transition. |
bab30554 EV |
147 | * Every time there is a change in policy, we will intercept and |
148 | * update the cpufreq policy with thermal constraints. | |
149 | * | |
150 | * Return: 0 (success) | |
02361418 ADK |
151 | */ |
152 | static int cpufreq_thermal_notifier(struct notifier_block *nb, | |
5fda7f68 | 153 | unsigned long event, void *data) |
02361418 ADK |
154 | { |
155 | struct cpufreq_policy *policy = data; | |
abcbcc25 | 156 | unsigned long clipped_freq; |
1dea432a | 157 | struct cpufreq_cooling_device *cpufreq_cdev; |
02361418 | 158 | |
a24af233 VK |
159 | if (event != CPUFREQ_ADJUST) |
160 | return NOTIFY_DONE; | |
02361418 | 161 | |
a24af233 | 162 | mutex_lock(&cooling_list_lock); |
1dea432a | 163 | list_for_each_entry(cpufreq_cdev, &cpufreq_cdev_list, node) { |
ba76dd9d VK |
164 | /* |
165 | * A new copy of the policy is sent to the notifier and can't | |
166 | * compare that directly. | |
167 | */ | |
168 | if (policy->cpu != cpufreq_cdev->policy->cpu) | |
a24af233 | 169 | continue; |
c36cf071 | 170 | |
1afb9c53 VK |
171 | /* |
172 | * policy->max is the maximum allowed frequency defined by user | |
173 | * and clipped_freq is the maximum that thermal constraints | |
174 | * allow. | |
175 | * | |
176 | * If clipped_freq is lower than policy->max, then we need to | |
177 | * readjust policy->max. | |
178 | * | |
179 | * But, if clipped_freq is greater than policy->max, we don't | |
180 | * need to do anything. | |
181 | */ | |
1dea432a | 182 | clipped_freq = cpufreq_cdev->clipped_freq; |
c36cf071 | 183 | |
1afb9c53 | 184 | if (policy->max > clipped_freq) |
abcbcc25 | 185 | cpufreq_verify_within_limits(policy, 0, clipped_freq); |
c36cf071 | 186 | break; |
c36cf071 | 187 | } |
a24af233 | 188 | mutex_unlock(&cooling_list_lock); |
c36cf071 JM |
189 | |
190 | return NOTIFY_OK; | |
191 | } | |
192 | ||
193 | /** | |
349d39dc VK |
194 | * update_freq_table() - Update the freq table with power numbers |
195 | * @cpufreq_cdev: the cpufreq cooling device in which to update the table | |
c36cf071 JM |
196 | * @capacitance: dynamic power coefficient for these cpus |
197 | * | |
349d39dc VK |
198 | * Update the freq table with power numbers. This table will be used in |
199 | * cpu_power_to_freq() and cpu_freq_to_power() to convert between power and | |
200 | * frequency efficiently. Power is stored in mW, frequency in KHz. The | |
201 | * resulting table is in descending order. | |
c36cf071 | 202 | * |
459ac375 | 203 | * Return: 0 on success, -EINVAL if there are no OPPs for any CPUs, |
349d39dc | 204 | * or -ENOMEM if we run out of memory. |
c36cf071 | 205 | */ |
349d39dc VK |
206 | static int update_freq_table(struct cpufreq_cooling_device *cpufreq_cdev, |
207 | u32 capacitance) | |
c36cf071 | 208 | { |
349d39dc | 209 | struct freq_table *freq_table = cpufreq_cdev->freq_table; |
c36cf071 JM |
210 | struct dev_pm_opp *opp; |
211 | struct device *dev = NULL; | |
349d39dc | 212 | int num_opps = 0, cpu = cpufreq_cdev->policy->cpu, i; |
c36cf071 | 213 | |
02bacb21 VK |
214 | dev = get_cpu_device(cpu); |
215 | if (unlikely(!dev)) { | |
216 | dev_warn(&cpufreq_cdev->cdev->device, | |
217 | "No cpu device for cpu %d\n", cpu); | |
218 | return -ENODEV; | |
c36cf071 | 219 | } |
02361418 | 220 | |
02bacb21 VK |
221 | num_opps = dev_pm_opp_get_opp_count(dev); |
222 | if (num_opps < 0) | |
223 | return num_opps; | |
224 | ||
349d39dc VK |
225 | /* |
226 | * The cpufreq table is also built from the OPP table and so the count | |
227 | * should match. | |
228 | */ | |
229 | if (num_opps != cpufreq_cdev->max_level + 1) { | |
230 | dev_warn(dev, "Number of OPPs not matching with max_levels\n"); | |
459ac375 | 231 | return -EINVAL; |
349d39dc | 232 | } |
02361418 | 233 | |
349d39dc VK |
234 | for (i = 0; i <= cpufreq_cdev->max_level; i++) { |
235 | unsigned long freq = freq_table[i].frequency * 1000; | |
236 | u32 freq_mhz = freq_table[i].frequency / 1000; | |
c36cf071 | 237 | u64 power; |
349d39dc | 238 | u32 voltage_mv; |
c36cf071 | 239 | |
349d39dc VK |
240 | /* |
241 | * Find ceil frequency as 'freq' may be slightly lower than OPP | |
242 | * freq due to truncation while converting to kHz. | |
243 | */ | |
244 | opp = dev_pm_opp_find_freq_ceil(dev, &freq); | |
245 | if (IS_ERR(opp)) { | |
246 | dev_err(dev, "failed to get opp for %lu frequency\n", | |
247 | freq); | |
248 | return -EINVAL; | |
459ac375 JM |
249 | } |
250 | ||
c36cf071 | 251 | voltage_mv = dev_pm_opp_get_voltage(opp) / 1000; |
8a31d9d9 | 252 | dev_pm_opp_put(opp); |
c36cf071 JM |
253 | |
254 | /* | |
255 | * Do the multiplication with MHz and millivolt so as | |
256 | * to not overflow. | |
257 | */ | |
258 | power = (u64)capacitance * freq_mhz * voltage_mv * voltage_mv; | |
259 | do_div(power, 1000000000); | |
260 | ||
c36cf071 | 261 | /* power is stored in mW */ |
349d39dc | 262 | freq_table[i].power = power; |
eba4f88d | 263 | } |
c36cf071 | 264 | |
1dea432a | 265 | cpufreq_cdev->cpu_dev = dev; |
c36cf071 | 266 | |
459ac375 | 267 | return 0; |
c36cf071 JM |
268 | } |
269 | ||
1dea432a | 270 | static u32 cpu_freq_to_power(struct cpufreq_cooling_device *cpufreq_cdev, |
c36cf071 JM |
271 | u32 freq) |
272 | { | |
273 | int i; | |
349d39dc | 274 | struct freq_table *freq_table = cpufreq_cdev->freq_table; |
c36cf071 | 275 | |
349d39dc VK |
276 | for (i = 1; i <= cpufreq_cdev->max_level; i++) |
277 | if (freq > freq_table[i].frequency) | |
c36cf071 JM |
278 | break; |
279 | ||
349d39dc | 280 | return freq_table[i - 1].power; |
c36cf071 JM |
281 | } |
282 | ||
1dea432a | 283 | static u32 cpu_power_to_freq(struct cpufreq_cooling_device *cpufreq_cdev, |
c36cf071 JM |
284 | u32 power) |
285 | { | |
286 | int i; | |
349d39dc | 287 | struct freq_table *freq_table = cpufreq_cdev->freq_table; |
c36cf071 | 288 | |
349d39dc VK |
289 | for (i = 1; i <= cpufreq_cdev->max_level; i++) |
290 | if (power > freq_table[i].power) | |
c36cf071 JM |
291 | break; |
292 | ||
349d39dc | 293 | return freq_table[i - 1].frequency; |
c36cf071 JM |
294 | } |
295 | ||
296 | /** | |
297 | * get_load() - get load for a cpu since last updated | |
1dea432a | 298 | * @cpufreq_cdev: &struct cpufreq_cooling_device for this cpu |
c36cf071 | 299 | * @cpu: cpu number |
ba76dd9d | 300 | * @cpu_idx: index of the cpu in time_in_idle* |
c36cf071 JM |
301 | * |
302 | * Return: The average load of cpu @cpu in percentage since this | |
303 | * function was last called. | |
304 | */ | |
1dea432a | 305 | static u32 get_load(struct cpufreq_cooling_device *cpufreq_cdev, int cpu, |
a53b8394 | 306 | int cpu_idx) |
c36cf071 JM |
307 | { |
308 | u32 load; | |
309 | u64 now, now_idle, delta_time, delta_idle; | |
81ee14da | 310 | struct time_in_idle *idle_time = &cpufreq_cdev->idle_time[cpu_idx]; |
c36cf071 JM |
311 | |
312 | now_idle = get_cpu_idle_time(cpu, &now, 0); | |
81ee14da VK |
313 | delta_idle = now_idle - idle_time->time; |
314 | delta_time = now - idle_time->timestamp; | |
c36cf071 JM |
315 | |
316 | if (delta_time <= delta_idle) | |
317 | load = 0; | |
318 | else | |
319 | load = div64_u64(100 * (delta_time - delta_idle), delta_time); | |
320 | ||
81ee14da VK |
321 | idle_time->time = now_idle; |
322 | idle_time->timestamp = now; | |
c36cf071 JM |
323 | |
324 | return load; | |
325 | } | |
326 | ||
327 | /** | |
328 | * get_static_power() - calculate the static power consumed by the cpus | |
1dea432a | 329 | * @cpufreq_cdev: struct &cpufreq_cooling_device for this cpu cdev |
c36cf071 JM |
330 | * @tz: thermal zone device in which we're operating |
331 | * @freq: frequency in KHz | |
332 | * @power: pointer in which to store the calculated static power | |
333 | * | |
334 | * Calculate the static power consumed by the cpus described by | |
335 | * @cpu_actor running at frequency @freq. This function relies on a | |
336 | * platform specific function that should have been provided when the | |
337 | * actor was registered. If it wasn't, the static power is assumed to | |
338 | * be negligible. The calculated static power is stored in @power. | |
339 | * | |
340 | * Return: 0 on success, -E* on failure. | |
341 | */ | |
1dea432a | 342 | static int get_static_power(struct cpufreq_cooling_device *cpufreq_cdev, |
c36cf071 JM |
343 | struct thermal_zone_device *tz, unsigned long freq, |
344 | u32 *power) | |
345 | { | |
346 | struct dev_pm_opp *opp; | |
347 | unsigned long voltage; | |
ba76dd9d | 348 | struct cpumask *cpumask = cpufreq_cdev->policy->related_cpus; |
c36cf071 JM |
349 | unsigned long freq_hz = freq * 1000; |
350 | ||
1dea432a | 351 | if (!cpufreq_cdev->plat_get_static_power || !cpufreq_cdev->cpu_dev) { |
c36cf071 JM |
352 | *power = 0; |
353 | return 0; | |
354 | } | |
355 | ||
1dea432a | 356 | opp = dev_pm_opp_find_freq_exact(cpufreq_cdev->cpu_dev, freq_hz, |
c36cf071 | 357 | true); |
3ea3217c | 358 | if (IS_ERR(opp)) { |
1dea432a | 359 | dev_warn_ratelimited(cpufreq_cdev->cpu_dev, |
3ea3217c VK |
360 | "Failed to find OPP for frequency %lu: %ld\n", |
361 | freq_hz, PTR_ERR(opp)); | |
362 | return -EINVAL; | |
363 | } | |
364 | ||
c36cf071 | 365 | voltage = dev_pm_opp_get_voltage(opp); |
8a31d9d9 | 366 | dev_pm_opp_put(opp); |
c36cf071 JM |
367 | |
368 | if (voltage == 0) { | |
1dea432a | 369 | dev_err_ratelimited(cpufreq_cdev->cpu_dev, |
3ea3217c VK |
370 | "Failed to get voltage for frequency %lu\n", |
371 | freq_hz); | |
c36cf071 JM |
372 | return -EINVAL; |
373 | } | |
374 | ||
1dea432a VK |
375 | return cpufreq_cdev->plat_get_static_power(cpumask, tz->passive_delay, |
376 | voltage, power); | |
c36cf071 JM |
377 | } |
378 | ||
379 | /** | |
380 | * get_dynamic_power() - calculate the dynamic power | |
1dea432a | 381 | * @cpufreq_cdev: &cpufreq_cooling_device for this cdev |
c36cf071 JM |
382 | * @freq: current frequency |
383 | * | |
384 | * Return: the dynamic power consumed by the cpus described by | |
1dea432a | 385 | * @cpufreq_cdev. |
c36cf071 | 386 | */ |
1dea432a | 387 | static u32 get_dynamic_power(struct cpufreq_cooling_device *cpufreq_cdev, |
c36cf071 JM |
388 | unsigned long freq) |
389 | { | |
390 | u32 raw_cpu_power; | |
391 | ||
1dea432a VK |
392 | raw_cpu_power = cpu_freq_to_power(cpufreq_cdev, freq); |
393 | return (raw_cpu_power * cpufreq_cdev->last_load) / 100; | |
02361418 ADK |
394 | } |
395 | ||
1b9e3526 | 396 | /* cpufreq cooling device callback functions are defined below */ |
02361418 ADK |
397 | |
398 | /** | |
399 | * cpufreq_get_max_state - callback function to get the max cooling state. | |
400 | * @cdev: thermal cooling device pointer. | |
401 | * @state: fill this variable with the max cooling state. | |
62c00421 EV |
402 | * |
403 | * Callback for the thermal cooling device to return the cpufreq | |
404 | * max cooling state. | |
405 | * | |
406 | * Return: 0 on success, an error code otherwise. | |
02361418 ADK |
407 | */ |
408 | static int cpufreq_get_max_state(struct thermal_cooling_device *cdev, | |
409 | unsigned long *state) | |
410 | { | |
1dea432a | 411 | struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata; |
9c51b05a | 412 | |
1dea432a | 413 | *state = cpufreq_cdev->max_level; |
dcc6c7fd | 414 | return 0; |
02361418 ADK |
415 | } |
416 | ||
417 | /** | |
418 | * cpufreq_get_cur_state - callback function to get the current cooling state. | |
419 | * @cdev: thermal cooling device pointer. | |
420 | * @state: fill this variable with the current cooling state. | |
3672552d EV |
421 | * |
422 | * Callback for the thermal cooling device to return the cpufreq | |
423 | * current cooling state. | |
424 | * | |
425 | * Return: 0 on success, an error code otherwise. | |
02361418 ADK |
426 | */ |
427 | static int cpufreq_get_cur_state(struct thermal_cooling_device *cdev, | |
428 | unsigned long *state) | |
429 | { | |
1dea432a | 430 | struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata; |
02361418 | 431 | |
1dea432a | 432 | *state = cpufreq_cdev->cpufreq_state; |
79491e53 | 433 | |
160b7d80 | 434 | return 0; |
02361418 ADK |
435 | } |
436 | ||
437 | /** | |
438 | * cpufreq_set_cur_state - callback function to set the current cooling state. | |
439 | * @cdev: thermal cooling device pointer. | |
440 | * @state: set this variable to the current cooling state. | |
56e05fdb EV |
441 | * |
442 | * Callback for the thermal cooling device to change the cpufreq | |
443 | * current cooling state. | |
444 | * | |
445 | * Return: 0 on success, an error code otherwise. | |
02361418 ADK |
446 | */ |
447 | static int cpufreq_set_cur_state(struct thermal_cooling_device *cdev, | |
448 | unsigned long state) | |
449 | { | |
1dea432a | 450 | struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata; |
5194fe46 | 451 | unsigned int clip_freq; |
4843c4a1 VK |
452 | |
453 | /* Request state should be less than max_level */ | |
1dea432a | 454 | if (WARN_ON(state > cpufreq_cdev->max_level)) |
4843c4a1 | 455 | return -EINVAL; |
5194fe46 VK |
456 | |
457 | /* Check if the old cooling action is same as new cooling action */ | |
1dea432a | 458 | if (cpufreq_cdev->cpufreq_state == state) |
5194fe46 | 459 | return 0; |
02361418 | 460 | |
349d39dc | 461 | clip_freq = cpufreq_cdev->freq_table[state].frequency; |
1dea432a VK |
462 | cpufreq_cdev->cpufreq_state = state; |
463 | cpufreq_cdev->clipped_freq = clip_freq; | |
5194fe46 | 464 | |
ba76dd9d | 465 | cpufreq_update_policy(cpufreq_cdev->policy->cpu); |
5194fe46 VK |
466 | |
467 | return 0; | |
02361418 ADK |
468 | } |
469 | ||
c36cf071 JM |
470 | /** |
471 | * cpufreq_get_requested_power() - get the current power | |
472 | * @cdev: &thermal_cooling_device pointer | |
473 | * @tz: a valid thermal zone device pointer | |
474 | * @power: pointer in which to store the resulting power | |
475 | * | |
476 | * Calculate the current power consumption of the cpus in milliwatts | |
477 | * and store it in @power. This function should actually calculate | |
478 | * the requested power, but it's hard to get the frequency that | |
479 | * cpufreq would have assigned if there were no thermal limits. | |
480 | * Instead, we calculate the current power on the assumption that the | |
481 | * immediate future will look like the immediate past. | |
482 | * | |
483 | * We use the current frequency and the average load since this | |
484 | * function was last called. In reality, there could have been | |
485 | * multiple opps since this function was last called and that affects | |
486 | * the load calculation. While it's not perfectly accurate, this | |
487 | * simplification is good enough and works. REVISIT this, as more | |
488 | * complex code may be needed if experiments show that it's not | |
489 | * accurate enough. | |
490 | * | |
491 | * Return: 0 on success, -E* if getting the static power failed. | |
492 | */ | |
493 | static int cpufreq_get_requested_power(struct thermal_cooling_device *cdev, | |
494 | struct thermal_zone_device *tz, | |
495 | u32 *power) | |
496 | { | |
497 | unsigned long freq; | |
6828a471 | 498 | int i = 0, cpu, ret; |
c36cf071 | 499 | u32 static_power, dynamic_power, total_load = 0; |
1dea432a | 500 | struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata; |
ba76dd9d | 501 | struct cpufreq_policy *policy = cpufreq_cdev->policy; |
6828a471 | 502 | u32 *load_cpu = NULL; |
c36cf071 | 503 | |
ba76dd9d | 504 | freq = cpufreq_quick_get(policy->cpu); |
c36cf071 | 505 | |
6828a471 | 506 | if (trace_thermal_power_cpu_get_power_enabled()) { |
ba76dd9d | 507 | u32 ncpus = cpumask_weight(policy->related_cpus); |
6828a471 | 508 | |
a71544cd | 509 | load_cpu = kcalloc(ncpus, sizeof(*load_cpu), GFP_KERNEL); |
6828a471 JM |
510 | } |
511 | ||
ba76dd9d | 512 | for_each_cpu(cpu, policy->related_cpus) { |
c36cf071 JM |
513 | u32 load; |
514 | ||
515 | if (cpu_online(cpu)) | |
1dea432a | 516 | load = get_load(cpufreq_cdev, cpu, i); |
c36cf071 JM |
517 | else |
518 | load = 0; | |
519 | ||
520 | total_load += load; | |
6828a471 JM |
521 | if (trace_thermal_power_cpu_limit_enabled() && load_cpu) |
522 | load_cpu[i] = load; | |
523 | ||
524 | i++; | |
c36cf071 JM |
525 | } |
526 | ||
1dea432a | 527 | cpufreq_cdev->last_load = total_load; |
c36cf071 | 528 | |
1dea432a VK |
529 | dynamic_power = get_dynamic_power(cpufreq_cdev, freq); |
530 | ret = get_static_power(cpufreq_cdev, tz, freq, &static_power); | |
6828a471 | 531 | if (ret) { |
a71544cd | 532 | kfree(load_cpu); |
c36cf071 | 533 | return ret; |
6828a471 JM |
534 | } |
535 | ||
536 | if (load_cpu) { | |
ba76dd9d VK |
537 | trace_thermal_power_cpu_get_power(policy->related_cpus, freq, |
538 | load_cpu, i, dynamic_power, | |
539 | static_power); | |
6828a471 | 540 | |
a71544cd | 541 | kfree(load_cpu); |
6828a471 | 542 | } |
c36cf071 JM |
543 | |
544 | *power = static_power + dynamic_power; | |
545 | return 0; | |
546 | } | |
547 | ||
548 | /** | |
549 | * cpufreq_state2power() - convert a cpu cdev state to power consumed | |
550 | * @cdev: &thermal_cooling_device pointer | |
551 | * @tz: a valid thermal zone device pointer | |
552 | * @state: cooling device state to be converted | |
553 | * @power: pointer in which to store the resulting power | |
554 | * | |
555 | * Convert cooling device state @state into power consumption in | |
556 | * milliwatts assuming 100% load. Store the calculated power in | |
557 | * @power. | |
558 | * | |
559 | * Return: 0 on success, -EINVAL if the cooling device state could not | |
560 | * be converted into a frequency or other -E* if there was an error | |
561 | * when calculating the static power. | |
562 | */ | |
563 | static int cpufreq_state2power(struct thermal_cooling_device *cdev, | |
564 | struct thermal_zone_device *tz, | |
565 | unsigned long state, u32 *power) | |
566 | { | |
567 | unsigned int freq, num_cpus; | |
c36cf071 JM |
568 | u32 static_power, dynamic_power; |
569 | int ret; | |
1dea432a | 570 | struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata; |
c36cf071 | 571 | |
ba76dd9d | 572 | num_cpus = cpumask_weight(cpufreq_cdev->policy->cpus); |
c36cf071 | 573 | |
349d39dc | 574 | freq = cpufreq_cdev->freq_table[state].frequency; |
ba76dd9d VK |
575 | if (!freq) |
576 | return -EINVAL; | |
c36cf071 | 577 | |
1dea432a VK |
578 | dynamic_power = cpu_freq_to_power(cpufreq_cdev, freq) * num_cpus; |
579 | ret = get_static_power(cpufreq_cdev, tz, freq, &static_power); | |
c36cf071 | 580 | if (ret) |
ba76dd9d | 581 | return ret; |
c36cf071 JM |
582 | |
583 | *power = static_power + dynamic_power; | |
d9cc34a6 | 584 | return ret; |
c36cf071 JM |
585 | } |
586 | ||
587 | /** | |
588 | * cpufreq_power2state() - convert power to a cooling device state | |
589 | * @cdev: &thermal_cooling_device pointer | |
590 | * @tz: a valid thermal zone device pointer | |
591 | * @power: power in milliwatts to be converted | |
592 | * @state: pointer in which to store the resulting state | |
593 | * | |
594 | * Calculate a cooling device state for the cpus described by @cdev | |
595 | * that would allow them to consume at most @power mW and store it in | |
596 | * @state. Note that this calculation depends on external factors | |
597 | * such as the cpu load or the current static power. Calling this | |
598 | * function with the same power as input can yield different cooling | |
599 | * device states depending on those external factors. | |
600 | * | |
601 | * Return: 0 on success, -ENODEV if no cpus are online or -EINVAL if | |
602 | * the calculated frequency could not be converted to a valid state. | |
603 | * The latter should not happen unless the frequencies available to | |
604 | * cpufreq have changed since the initialization of the cpu cooling | |
605 | * device. | |
606 | */ | |
607 | static int cpufreq_power2state(struct thermal_cooling_device *cdev, | |
608 | struct thermal_zone_device *tz, u32 power, | |
609 | unsigned long *state) | |
610 | { | |
ba76dd9d | 611 | unsigned int cur_freq, target_freq; |
c36cf071 JM |
612 | int ret; |
613 | s32 dyn_power; | |
614 | u32 last_load, normalised_power, static_power; | |
1dea432a | 615 | struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata; |
ba76dd9d | 616 | struct cpufreq_policy *policy = cpufreq_cdev->policy; |
c36cf071 | 617 | |
ba76dd9d | 618 | cur_freq = cpufreq_quick_get(policy->cpu); |
1dea432a | 619 | ret = get_static_power(cpufreq_cdev, tz, cur_freq, &static_power); |
c36cf071 JM |
620 | if (ret) |
621 | return ret; | |
622 | ||
623 | dyn_power = power - static_power; | |
624 | dyn_power = dyn_power > 0 ? dyn_power : 0; | |
1dea432a | 625 | last_load = cpufreq_cdev->last_load ?: 1; |
c36cf071 | 626 | normalised_power = (dyn_power * 100) / last_load; |
1dea432a | 627 | target_freq = cpu_power_to_freq(cpufreq_cdev, normalised_power); |
c36cf071 | 628 | |
3e08b2df | 629 | *state = get_level(cpufreq_cdev, target_freq); |
c36cf071 | 630 | if (*state == THERMAL_CSTATE_INVALID) { |
9aec9082 VK |
631 | dev_err_ratelimited(&cdev->device, |
632 | "Failed to convert %dKHz for cpu %d into a cdev state\n", | |
ba76dd9d | 633 | target_freq, policy->cpu); |
c36cf071 JM |
634 | return -EINVAL; |
635 | } | |
636 | ||
ba76dd9d VK |
637 | trace_thermal_power_cpu_limit(policy->related_cpus, target_freq, *state, |
638 | power); | |
c36cf071 JM |
639 | return 0; |
640 | } | |
641 | ||
02361418 | 642 | /* Bind cpufreq callbacks to thermal cooling device ops */ |
a305a438 | 643 | |
c36cf071 | 644 | static struct thermal_cooling_device_ops cpufreq_cooling_ops = { |
02361418 ADK |
645 | .get_max_state = cpufreq_get_max_state, |
646 | .get_cur_state = cpufreq_get_cur_state, | |
647 | .set_cur_state = cpufreq_set_cur_state, | |
648 | }; | |
649 | ||
a305a438 BJ |
650 | static struct thermal_cooling_device_ops cpufreq_power_cooling_ops = { |
651 | .get_max_state = cpufreq_get_max_state, | |
652 | .get_cur_state = cpufreq_get_cur_state, | |
653 | .set_cur_state = cpufreq_set_cur_state, | |
654 | .get_requested_power = cpufreq_get_requested_power, | |
655 | .state2power = cpufreq_state2power, | |
656 | .power2state = cpufreq_power2state, | |
657 | }; | |
658 | ||
02361418 ADK |
659 | /* Notifier for cpufreq policy change */ |
660 | static struct notifier_block thermal_cpufreq_notifier_block = { | |
661 | .notifier_call = cpufreq_thermal_notifier, | |
662 | }; | |
663 | ||
f6859014 VK |
664 | static unsigned int find_next_max(struct cpufreq_frequency_table *table, |
665 | unsigned int prev_max) | |
666 | { | |
667 | struct cpufreq_frequency_table *pos; | |
668 | unsigned int max = 0; | |
669 | ||
670 | cpufreq_for_each_valid_entry(pos, table) { | |
671 | if (pos->frequency > max && pos->frequency < prev_max) | |
672 | max = pos->frequency; | |
673 | } | |
674 | ||
675 | return max; | |
676 | } | |
677 | ||
02361418 | 678 | /** |
39d99cff EV |
679 | * __cpufreq_cooling_register - helper function to create cpufreq cooling device |
680 | * @np: a valid struct device_node to the cooling device device tree node | |
4d753aa7 | 681 | * @policy: cpufreq policy |
405fb825 | 682 | * Normally this should be same as cpufreq policy->related_cpus. |
c36cf071 JM |
683 | * @capacitance: dynamic power coefficient for these cpus |
684 | * @plat_static_func: function to calculate the static power consumed by these | |
685 | * cpus (optional) | |
12cb08ba EV |
686 | * |
687 | * This interface function registers the cpufreq cooling device with the name | |
688 | * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq | |
39d99cff EV |
689 | * cooling devices. It also gives the opportunity to link the cooling device |
690 | * with a device tree node, in order to bind it via the thermal DT code. | |
12cb08ba EV |
691 | * |
692 | * Return: a valid struct thermal_cooling_device pointer on success, | |
693 | * on failure, it returns a corresponding ERR_PTR(). | |
02361418 | 694 | */ |
39d99cff EV |
695 | static struct thermal_cooling_device * |
696 | __cpufreq_cooling_register(struct device_node *np, | |
4d753aa7 | 697 | struct cpufreq_policy *policy, u32 capacitance, |
c36cf071 | 698 | get_static_t plat_static_func) |
02361418 | 699 | { |
04bdbdf9 | 700 | struct thermal_cooling_device *cdev; |
1dea432a | 701 | struct cpufreq_cooling_device *cpufreq_cdev; |
02361418 | 702 | char dev_name[THERMAL_NAME_LENGTH]; |
c36cf071 | 703 | unsigned int freq, i, num_cpus; |
405fb825 | 704 | int ret; |
a305a438 | 705 | struct thermal_cooling_device_ops *cooling_ops; |
088db931 | 706 | bool first; |
02361418 | 707 | |
4d753aa7 VK |
708 | if (IS_ERR_OR_NULL(policy)) { |
709 | pr_err("%s: cpufreq policy isn't valid: %p", __func__, policy); | |
710 | return ERR_PTR(-EINVAL); | |
f8bfc116 VK |
711 | } |
712 | ||
55d85293 VK |
713 | i = cpufreq_table_count_valid_entries(policy); |
714 | if (!i) { | |
715 | pr_debug("%s: CPUFreq table not found or has no valid entries\n", | |
716 | __func__); | |
4d753aa7 | 717 | return ERR_PTR(-ENODEV); |
02361418 | 718 | } |
0f1be51c | 719 | |
1dea432a | 720 | cpufreq_cdev = kzalloc(sizeof(*cpufreq_cdev), GFP_KERNEL); |
4d753aa7 VK |
721 | if (!cpufreq_cdev) |
722 | return ERR_PTR(-ENOMEM); | |
02361418 | 723 | |
b12b6519 | 724 | cpufreq_cdev->policy = policy; |
4d753aa7 | 725 | num_cpus = cpumask_weight(policy->related_cpus); |
81ee14da VK |
726 | cpufreq_cdev->idle_time = kcalloc(num_cpus, |
727 | sizeof(*cpufreq_cdev->idle_time), | |
728 | GFP_KERNEL); | |
729 | if (!cpufreq_cdev->idle_time) { | |
04bdbdf9 | 730 | cdev = ERR_PTR(-ENOMEM); |
c36cf071 JM |
731 | goto free_cdev; |
732 | } | |
733 | ||
55d85293 VK |
734 | /* max_level is an index, not a counter */ |
735 | cpufreq_cdev->max_level = i - 1; | |
dcc6c7fd | 736 | |
55d85293 VK |
737 | cpufreq_cdev->freq_table = kmalloc(sizeof(*cpufreq_cdev->freq_table) * i, |
738 | GFP_KERNEL); | |
1dea432a | 739 | if (!cpufreq_cdev->freq_table) { |
04bdbdf9 | 740 | cdev = ERR_PTR(-ENOMEM); |
81ee14da | 741 | goto free_idle_time; |
f6859014 VK |
742 | } |
743 | ||
ae606089 MW |
744 | ret = ida_simple_get(&cpufreq_ida, 0, 0, GFP_KERNEL); |
745 | if (ret < 0) { | |
04bdbdf9 | 746 | cdev = ERR_PTR(ret); |
349d39dc | 747 | goto free_table; |
02361418 | 748 | } |
1dea432a | 749 | cpufreq_cdev->id = ret; |
02361418 | 750 | |
349d39dc VK |
751 | snprintf(dev_name, sizeof(dev_name), "thermal-cpufreq-%d", |
752 | cpufreq_cdev->id); | |
753 | ||
f6859014 | 754 | /* Fill freq-table in descending order of frequencies */ |
1dea432a | 755 | for (i = 0, freq = -1; i <= cpufreq_cdev->max_level; i++) { |
55d85293 | 756 | freq = find_next_max(policy->freq_table, freq); |
349d39dc | 757 | cpufreq_cdev->freq_table[i].frequency = freq; |
f6859014 VK |
758 | |
759 | /* Warn for duplicate entries */ | |
760 | if (!freq) | |
761 | pr_warn("%s: table has duplicate entries\n", __func__); | |
762 | else | |
763 | pr_debug("%s: freq:%u KHz\n", __func__, freq); | |
02361418 | 764 | } |
f6859014 | 765 | |
349d39dc VK |
766 | if (capacitance) { |
767 | cpufreq_cdev->plat_get_static_power = plat_static_func; | |
768 | ||
769 | ret = update_freq_table(cpufreq_cdev, capacitance); | |
770 | if (ret) { | |
771 | cdev = ERR_PTR(ret); | |
772 | goto remove_ida; | |
773 | } | |
774 | ||
775 | cooling_ops = &cpufreq_power_cooling_ops; | |
776 | } else { | |
777 | cooling_ops = &cpufreq_cooling_ops; | |
778 | } | |
f840ab18 | 779 | |
04bdbdf9 VK |
780 | cdev = thermal_of_cooling_device_register(np, dev_name, cpufreq_cdev, |
781 | cooling_ops); | |
782 | if (IS_ERR(cdev)) | |
ae606089 | 783 | goto remove_ida; |
f840ab18 | 784 | |
349d39dc | 785 | cpufreq_cdev->clipped_freq = cpufreq_cdev->freq_table[0].frequency; |
04bdbdf9 | 786 | cpufreq_cdev->cdev = cdev; |
92e615ec | 787 | |
02373d7c | 788 | mutex_lock(&cooling_list_lock); |
088db931 | 789 | /* Register the notifier for first cpufreq cooling device */ |
1dea432a VK |
790 | first = list_empty(&cpufreq_cdev_list); |
791 | list_add(&cpufreq_cdev->node, &cpufreq_cdev_list); | |
088db931 | 792 | mutex_unlock(&cooling_list_lock); |
02373d7c | 793 | |
088db931 | 794 | if (first) |
02361418 | 795 | cpufreq_register_notifier(&thermal_cpufreq_notifier_block, |
5fda7f68 | 796 | CPUFREQ_POLICY_NOTIFIER); |
79491e53 | 797 | |
4d753aa7 | 798 | return cdev; |
730abe06 | 799 | |
ae606089 | 800 | remove_ida: |
1dea432a | 801 | ida_simple_remove(&cpufreq_ida, cpufreq_cdev->id); |
f6859014 | 802 | free_table: |
1dea432a | 803 | kfree(cpufreq_cdev->freq_table); |
81ee14da VK |
804 | free_idle_time: |
805 | kfree(cpufreq_cdev->idle_time); | |
730abe06 | 806 | free_cdev: |
1dea432a | 807 | kfree(cpufreq_cdev); |
04bdbdf9 | 808 | return cdev; |
02361418 | 809 | } |
39d99cff EV |
810 | |
811 | /** | |
812 | * cpufreq_cooling_register - function to create cpufreq cooling device. | |
4d753aa7 | 813 | * @policy: cpufreq policy |
39d99cff EV |
814 | * |
815 | * This interface function registers the cpufreq cooling device with the name | |
816 | * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq | |
817 | * cooling devices. | |
818 | * | |
819 | * Return: a valid struct thermal_cooling_device pointer on success, | |
820 | * on failure, it returns a corresponding ERR_PTR(). | |
821 | */ | |
822 | struct thermal_cooling_device * | |
4d753aa7 | 823 | cpufreq_cooling_register(struct cpufreq_policy *policy) |
39d99cff | 824 | { |
4d753aa7 | 825 | return __cpufreq_cooling_register(NULL, policy, 0, NULL); |
39d99cff | 826 | } |
243dbd9c | 827 | EXPORT_SYMBOL_GPL(cpufreq_cooling_register); |
02361418 | 828 | |
39d99cff EV |
829 | /** |
830 | * of_cpufreq_cooling_register - function to create cpufreq cooling device. | |
831 | * @np: a valid struct device_node to the cooling device device tree node | |
4d753aa7 | 832 | * @policy: cpufreq policy |
39d99cff EV |
833 | * |
834 | * This interface function registers the cpufreq cooling device with the name | |
835 | * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq | |
836 | * cooling devices. Using this API, the cpufreq cooling device will be | |
837 | * linked to the device tree node provided. | |
838 | * | |
839 | * Return: a valid struct thermal_cooling_device pointer on success, | |
840 | * on failure, it returns a corresponding ERR_PTR(). | |
841 | */ | |
842 | struct thermal_cooling_device * | |
843 | of_cpufreq_cooling_register(struct device_node *np, | |
4d753aa7 | 844 | struct cpufreq_policy *policy) |
39d99cff EV |
845 | { |
846 | if (!np) | |
847 | return ERR_PTR(-EINVAL); | |
848 | ||
4d753aa7 | 849 | return __cpufreq_cooling_register(np, policy, 0, NULL); |
39d99cff EV |
850 | } |
851 | EXPORT_SYMBOL_GPL(of_cpufreq_cooling_register); | |
852 | ||
c36cf071 JM |
853 | /** |
854 | * cpufreq_power_cooling_register() - create cpufreq cooling device with power extensions | |
4d753aa7 | 855 | * @policy: cpufreq policy |
c36cf071 JM |
856 | * @capacitance: dynamic power coefficient for these cpus |
857 | * @plat_static_func: function to calculate the static power consumed by these | |
858 | * cpus (optional) | |
859 | * | |
860 | * This interface function registers the cpufreq cooling device with | |
861 | * the name "thermal-cpufreq-%x". This api can support multiple | |
862 | * instances of cpufreq cooling devices. Using this function, the | |
863 | * cooling device will implement the power extensions by using a | |
864 | * simple cpu power model. The cpus must have registered their OPPs | |
865 | * using the OPP library. | |
866 | * | |
867 | * An optional @plat_static_func may be provided to calculate the | |
868 | * static power consumed by these cpus. If the platform's static | |
869 | * power consumption is unknown or negligible, make it NULL. | |
870 | * | |
871 | * Return: a valid struct thermal_cooling_device pointer on success, | |
872 | * on failure, it returns a corresponding ERR_PTR(). | |
873 | */ | |
874 | struct thermal_cooling_device * | |
4d753aa7 | 875 | cpufreq_power_cooling_register(struct cpufreq_policy *policy, u32 capacitance, |
c36cf071 JM |
876 | get_static_t plat_static_func) |
877 | { | |
4d753aa7 | 878 | return __cpufreq_cooling_register(NULL, policy, capacitance, |
c36cf071 JM |
879 | plat_static_func); |
880 | } | |
881 | EXPORT_SYMBOL(cpufreq_power_cooling_register); | |
882 | ||
883 | /** | |
884 | * of_cpufreq_power_cooling_register() - create cpufreq cooling device with power extensions | |
885 | * @np: a valid struct device_node to the cooling device device tree node | |
4d753aa7 | 886 | * @policy: cpufreq policy |
c36cf071 JM |
887 | * @capacitance: dynamic power coefficient for these cpus |
888 | * @plat_static_func: function to calculate the static power consumed by these | |
889 | * cpus (optional) | |
890 | * | |
891 | * This interface function registers the cpufreq cooling device with | |
892 | * the name "thermal-cpufreq-%x". This api can support multiple | |
893 | * instances of cpufreq cooling devices. Using this API, the cpufreq | |
894 | * cooling device will be linked to the device tree node provided. | |
895 | * Using this function, the cooling device will implement the power | |
896 | * extensions by using a simple cpu power model. The cpus must have | |
897 | * registered their OPPs using the OPP library. | |
898 | * | |
899 | * An optional @plat_static_func may be provided to calculate the | |
900 | * static power consumed by these cpus. If the platform's static | |
901 | * power consumption is unknown or negligible, make it NULL. | |
902 | * | |
903 | * Return: a valid struct thermal_cooling_device pointer on success, | |
904 | * on failure, it returns a corresponding ERR_PTR(). | |
905 | */ | |
906 | struct thermal_cooling_device * | |
907 | of_cpufreq_power_cooling_register(struct device_node *np, | |
4d753aa7 | 908 | struct cpufreq_policy *policy, |
c36cf071 JM |
909 | u32 capacitance, |
910 | get_static_t plat_static_func) | |
911 | { | |
912 | if (!np) | |
913 | return ERR_PTR(-EINVAL); | |
914 | ||
4d753aa7 | 915 | return __cpufreq_cooling_register(np, policy, capacitance, |
c36cf071 JM |
916 | plat_static_func); |
917 | } | |
918 | EXPORT_SYMBOL(of_cpufreq_power_cooling_register); | |
919 | ||
02361418 ADK |
920 | /** |
921 | * cpufreq_cooling_unregister - function to remove cpufreq cooling device. | |
922 | * @cdev: thermal cooling device pointer. | |
135266b4 EV |
923 | * |
924 | * This interface function unregisters the "thermal-cpufreq-%x" cooling device. | |
02361418 ADK |
925 | */ |
926 | void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev) | |
927 | { | |
1dea432a | 928 | struct cpufreq_cooling_device *cpufreq_cdev; |
088db931 | 929 | bool last; |
02361418 | 930 | |
50e66c7e EV |
931 | if (!cdev) |
932 | return; | |
933 | ||
1dea432a | 934 | cpufreq_cdev = cdev->devdata; |
02361418 | 935 | |
ae606089 | 936 | mutex_lock(&cooling_list_lock); |
1dea432a | 937 | list_del(&cpufreq_cdev->node); |
02361418 | 938 | /* Unregister the notifier for the last cpufreq cooling device */ |
1dea432a | 939 | last = list_empty(&cpufreq_cdev_list); |
088db931 MW |
940 | mutex_unlock(&cooling_list_lock); |
941 | ||
942 | if (last) | |
02361418 | 943 | cpufreq_unregister_notifier(&thermal_cpufreq_notifier_block, |
5fda7f68 | 944 | CPUFREQ_POLICY_NOTIFIER); |
02373d7c | 945 | |
04bdbdf9 | 946 | thermal_cooling_device_unregister(cpufreq_cdev->cdev); |
1dea432a | 947 | ida_simple_remove(&cpufreq_ida, cpufreq_cdev->id); |
81ee14da | 948 | kfree(cpufreq_cdev->idle_time); |
1dea432a VK |
949 | kfree(cpufreq_cdev->freq_table); |
950 | kfree(cpufreq_cdev); | |
02361418 | 951 | } |
243dbd9c | 952 | EXPORT_SYMBOL_GPL(cpufreq_cooling_unregister); |