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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> | |
c36cf071 | 29 | #include <linux/pm_opp.h> |
02361418 ADK |
30 | #include <linux/slab.h> |
31 | #include <linux/cpu.h> | |
32 | #include <linux/cpu_cooling.h> | |
33 | ||
6828a471 JM |
34 | #include <trace/events/thermal.h> |
35 | ||
07d888d8 VK |
36 | /* |
37 | * Cooling state <-> CPUFreq frequency | |
38 | * | |
39 | * Cooling states are translated to frequencies throughout this driver and this | |
40 | * is the relation between them. | |
41 | * | |
42 | * Highest cooling state corresponds to lowest possible frequency. | |
43 | * | |
44 | * i.e. | |
45 | * level 0 --> 1st Max Freq | |
46 | * level 1 --> 2nd Max Freq | |
47 | * ... | |
48 | */ | |
49 | ||
c36cf071 JM |
50 | /** |
51 | * struct power_table - frequency to power conversion | |
52 | * @frequency: frequency in KHz | |
53 | * @power: power in mW | |
54 | * | |
55 | * This structure is built when the cooling device registers and helps | |
56 | * in translating frequency to power and viceversa. | |
57 | */ | |
58 | struct power_table { | |
59 | u32 frequency; | |
60 | u32 power; | |
61 | }; | |
62 | ||
02361418 | 63 | /** |
3b3c0748 | 64 | * struct cpufreq_cooling_device - data for cooling device with cpufreq |
02361418 ADK |
65 | * @id: unique integer value corresponding to each cpufreq_cooling_device |
66 | * registered. | |
3b3c0748 EV |
67 | * @cool_dev: thermal_cooling_device pointer to keep track of the |
68 | * registered cooling device. | |
02361418 ADK |
69 | * @cpufreq_state: integer value representing the current state of cpufreq |
70 | * cooling devices. | |
59f0d218 | 71 | * @clipped_freq: integer value representing the absolute value of the clipped |
02361418 | 72 | * frequency. |
dcc6c7fd VK |
73 | * @max_level: maximum cooling level. One less than total number of valid |
74 | * cpufreq frequencies. | |
02361418 | 75 | * @allowed_cpus: all the cpus involved for this cpufreq_cooling_device. |
fc4de356 | 76 | * @node: list_head to link all cpufreq_cooling_device together. |
c36cf071 JM |
77 | * @last_load: load measured by the latest call to cpufreq_get_actual_power() |
78 | * @time_in_idle: previous reading of the absolute time that this cpu was idle | |
79 | * @time_in_idle_timestamp: wall time of the last invocation of | |
80 | * get_cpu_idle_time_us() | |
81 | * @dyn_power_table: array of struct power_table for frequency to power | |
82 | * conversion, sorted in ascending order. | |
83 | * @dyn_power_table_entries: number of entries in the @dyn_power_table array | |
84 | * @cpu_dev: the first cpu_device from @allowed_cpus that has OPPs registered | |
85 | * @plat_get_static_power: callback to calculate the static power | |
02361418 | 86 | * |
beca6053 VK |
87 | * This structure is required for keeping information of each registered |
88 | * cpufreq_cooling_device. | |
02361418 ADK |
89 | */ |
90 | struct cpufreq_cooling_device { | |
91 | int id; | |
92 | struct thermal_cooling_device *cool_dev; | |
93 | unsigned int cpufreq_state; | |
59f0d218 | 94 | unsigned int clipped_freq; |
dcc6c7fd | 95 | unsigned int max_level; |
f6859014 | 96 | unsigned int *freq_table; /* In descending order */ |
02361418 | 97 | struct cpumask allowed_cpus; |
2dcd851f | 98 | struct list_head node; |
c36cf071 JM |
99 | u32 last_load; |
100 | u64 *time_in_idle; | |
101 | u64 *time_in_idle_timestamp; | |
102 | struct power_table *dyn_power_table; | |
103 | int dyn_power_table_entries; | |
104 | struct device *cpu_dev; | |
105 | get_static_t plat_get_static_power; | |
02361418 | 106 | }; |
02361418 | 107 | static DEFINE_IDR(cpufreq_idr); |
160b7d80 | 108 | static DEFINE_MUTEX(cooling_cpufreq_lock); |
02361418 | 109 | |
02373d7c RK |
110 | static unsigned int cpufreq_dev_count; |
111 | ||
112 | static DEFINE_MUTEX(cooling_list_lock); | |
2dcd851f | 113 | static LIST_HEAD(cpufreq_dev_list); |
02361418 ADK |
114 | |
115 | /** | |
116 | * get_idr - function to get a unique id. | |
117 | * @idr: struct idr * handle used to create a id. | |
118 | * @id: int * value generated by this function. | |
79491e53 EV |
119 | * |
120 | * This function will populate @id with an unique | |
121 | * id, using the idr API. | |
122 | * | |
123 | * Return: 0 on success, an error code on failure. | |
02361418 ADK |
124 | */ |
125 | static int get_idr(struct idr *idr, int *id) | |
126 | { | |
6deb69fa | 127 | int ret; |
02361418 ADK |
128 | |
129 | mutex_lock(&cooling_cpufreq_lock); | |
6deb69fa | 130 | ret = idr_alloc(idr, NULL, 0, 0, GFP_KERNEL); |
02361418 | 131 | mutex_unlock(&cooling_cpufreq_lock); |
6deb69fa TH |
132 | if (unlikely(ret < 0)) |
133 | return ret; | |
134 | *id = ret; | |
79491e53 | 135 | |
02361418 ADK |
136 | return 0; |
137 | } | |
138 | ||
139 | /** | |
140 | * release_idr - function to free the unique id. | |
141 | * @idr: struct idr * handle used for creating the id. | |
142 | * @id: int value representing the unique id. | |
143 | */ | |
144 | static void release_idr(struct idr *idr, int id) | |
145 | { | |
146 | mutex_lock(&cooling_cpufreq_lock); | |
147 | idr_remove(idr, id); | |
148 | mutex_unlock(&cooling_cpufreq_lock); | |
149 | } | |
150 | ||
151 | /* Below code defines functions to be used for cpufreq as cooling device */ | |
152 | ||
153 | /** | |
4843c4a1 | 154 | * get_level: Find the level for a particular frequency |
b9f8b416 | 155 | * @cpufreq_dev: cpufreq_dev for which the property is required |
4843c4a1 | 156 | * @freq: Frequency |
82b9ee40 | 157 | * |
4843c4a1 | 158 | * Return: level on success, THERMAL_CSTATE_INVALID on error. |
02361418 | 159 | */ |
4843c4a1 VK |
160 | static unsigned long get_level(struct cpufreq_cooling_device *cpufreq_dev, |
161 | unsigned int freq) | |
02361418 | 162 | { |
4843c4a1 | 163 | unsigned long level; |
a116776f | 164 | |
4843c4a1 VK |
165 | for (level = 0; level <= cpufreq_dev->max_level; level++) { |
166 | if (freq == cpufreq_dev->freq_table[level]) | |
167 | return level; | |
02361418 | 168 | |
4843c4a1 VK |
169 | if (freq > cpufreq_dev->freq_table[level]) |
170 | break; | |
fc35b35c | 171 | } |
02361418 | 172 | |
4843c4a1 | 173 | return THERMAL_CSTATE_INVALID; |
fc35b35c ZR |
174 | } |
175 | ||
44952d33 | 176 | /** |
728c03c9 | 177 | * cpufreq_cooling_get_level - for a given cpu, return the cooling level. |
44952d33 EV |
178 | * @cpu: cpu for which the level is required |
179 | * @freq: the frequency of interest | |
180 | * | |
181 | * This function will match the cooling level corresponding to the | |
182 | * requested @freq and return it. | |
183 | * | |
184 | * Return: The matched cooling level on success or THERMAL_CSTATE_INVALID | |
185 | * otherwise. | |
186 | */ | |
57df8106 ZR |
187 | unsigned long cpufreq_cooling_get_level(unsigned int cpu, unsigned int freq) |
188 | { | |
b9f8b416 | 189 | struct cpufreq_cooling_device *cpufreq_dev; |
02361418 | 190 | |
02373d7c | 191 | mutex_lock(&cooling_list_lock); |
b9f8b416 VK |
192 | list_for_each_entry(cpufreq_dev, &cpufreq_dev_list, node) { |
193 | if (cpumask_test_cpu(cpu, &cpufreq_dev->allowed_cpus)) { | |
02373d7c | 194 | mutex_unlock(&cooling_list_lock); |
4843c4a1 | 195 | return get_level(cpufreq_dev, freq); |
b9f8b416 | 196 | } |
02361418 | 197 | } |
02373d7c | 198 | mutex_unlock(&cooling_list_lock); |
02361418 | 199 | |
b9f8b416 VK |
200 | pr_err("%s: cpu:%d not part of any cooling device\n", __func__, cpu); |
201 | return THERMAL_CSTATE_INVALID; | |
02361418 | 202 | } |
243dbd9c | 203 | EXPORT_SYMBOL_GPL(cpufreq_cooling_get_level); |
02361418 ADK |
204 | |
205 | /** | |
206 | * cpufreq_thermal_notifier - notifier callback for cpufreq policy change. | |
207 | * @nb: struct notifier_block * with callback info. | |
208 | * @event: value showing cpufreq event for which this function invoked. | |
209 | * @data: callback-specific data | |
bab30554 | 210 | * |
9746b6e7 | 211 | * Callback to hijack the notification on cpufreq policy transition. |
bab30554 EV |
212 | * Every time there is a change in policy, we will intercept and |
213 | * update the cpufreq policy with thermal constraints. | |
214 | * | |
215 | * Return: 0 (success) | |
02361418 ADK |
216 | */ |
217 | static int cpufreq_thermal_notifier(struct notifier_block *nb, | |
5fda7f68 | 218 | unsigned long event, void *data) |
02361418 ADK |
219 | { |
220 | struct cpufreq_policy *policy = data; | |
abcbcc25 | 221 | unsigned long clipped_freq; |
2dcd851f | 222 | struct cpufreq_cooling_device *cpufreq_dev; |
02361418 | 223 | |
a24af233 VK |
224 | if (event != CPUFREQ_ADJUST) |
225 | return NOTIFY_DONE; | |
02361418 | 226 | |
a24af233 VK |
227 | mutex_lock(&cooling_list_lock); |
228 | list_for_each_entry(cpufreq_dev, &cpufreq_dev_list, node) { | |
229 | if (!cpumask_test_cpu(policy->cpu, &cpufreq_dev->allowed_cpus)) | |
230 | continue; | |
c36cf071 | 231 | |
abcbcc25 | 232 | clipped_freq = cpufreq_dev->clipped_freq; |
c36cf071 | 233 | |
abcbcc25 VK |
234 | if (policy->max != clipped_freq) |
235 | cpufreq_verify_within_limits(policy, 0, clipped_freq); | |
c36cf071 | 236 | break; |
c36cf071 | 237 | } |
a24af233 | 238 | mutex_unlock(&cooling_list_lock); |
c36cf071 JM |
239 | |
240 | return NOTIFY_OK; | |
241 | } | |
242 | ||
243 | /** | |
244 | * build_dyn_power_table() - create a dynamic power to frequency table | |
245 | * @cpufreq_device: the cpufreq cooling device in which to store the table | |
246 | * @capacitance: dynamic power coefficient for these cpus | |
247 | * | |
248 | * Build a dynamic power to frequency table for this cpu and store it | |
249 | * in @cpufreq_device. This table will be used in cpu_power_to_freq() and | |
250 | * cpu_freq_to_power() to convert between power and frequency | |
251 | * efficiently. Power is stored in mW, frequency in KHz. The | |
252 | * resulting table is in ascending order. | |
253 | * | |
254 | * Return: 0 on success, -E* on error. | |
255 | */ | |
256 | static int build_dyn_power_table(struct cpufreq_cooling_device *cpufreq_device, | |
257 | u32 capacitance) | |
258 | { | |
259 | struct power_table *power_table; | |
260 | struct dev_pm_opp *opp; | |
261 | struct device *dev = NULL; | |
262 | int num_opps = 0, cpu, i, ret = 0; | |
263 | unsigned long freq; | |
264 | ||
265 | rcu_read_lock(); | |
266 | ||
267 | for_each_cpu(cpu, &cpufreq_device->allowed_cpus) { | |
268 | dev = get_cpu_device(cpu); | |
269 | if (!dev) { | |
270 | dev_warn(&cpufreq_device->cool_dev->device, | |
271 | "No cpu device for cpu %d\n", cpu); | |
2dcd851f | 272 | continue; |
c36cf071 | 273 | } |
2dcd851f | 274 | |
c36cf071 JM |
275 | num_opps = dev_pm_opp_get_opp_count(dev); |
276 | if (num_opps > 0) { | |
277 | break; | |
278 | } else if (num_opps < 0) { | |
279 | ret = num_opps; | |
280 | goto unlock; | |
281 | } | |
282 | } | |
02361418 | 283 | |
c36cf071 JM |
284 | if (num_opps == 0) { |
285 | ret = -EINVAL; | |
286 | goto unlock; | |
2dcd851f | 287 | } |
02361418 | 288 | |
c36cf071 | 289 | power_table = kcalloc(num_opps, sizeof(*power_table), GFP_KERNEL); |
0cdf97e1 JM |
290 | if (!power_table) { |
291 | ret = -ENOMEM; | |
292 | goto unlock; | |
293 | } | |
c36cf071 JM |
294 | |
295 | for (freq = 0, i = 0; | |
296 | opp = dev_pm_opp_find_freq_ceil(dev, &freq), !IS_ERR(opp); | |
297 | freq++, i++) { | |
298 | u32 freq_mhz, voltage_mv; | |
299 | u64 power; | |
300 | ||
301 | freq_mhz = freq / 1000000; | |
302 | voltage_mv = dev_pm_opp_get_voltage(opp) / 1000; | |
303 | ||
304 | /* | |
305 | * Do the multiplication with MHz and millivolt so as | |
306 | * to not overflow. | |
307 | */ | |
308 | power = (u64)capacitance * freq_mhz * voltage_mv * voltage_mv; | |
309 | do_div(power, 1000000000); | |
310 | ||
311 | /* frequency is stored in power_table in KHz */ | |
312 | power_table[i].frequency = freq / 1000; | |
313 | ||
314 | /* power is stored in mW */ | |
315 | power_table[i].power = power; | |
316 | } | |
317 | ||
318 | if (i == 0) { | |
319 | ret = PTR_ERR(opp); | |
320 | goto unlock; | |
321 | } | |
322 | ||
323 | cpufreq_device->cpu_dev = dev; | |
324 | cpufreq_device->dyn_power_table = power_table; | |
325 | cpufreq_device->dyn_power_table_entries = i; | |
326 | ||
327 | unlock: | |
328 | rcu_read_unlock(); | |
329 | return ret; | |
330 | } | |
331 | ||
332 | static u32 cpu_freq_to_power(struct cpufreq_cooling_device *cpufreq_device, | |
333 | u32 freq) | |
334 | { | |
335 | int i; | |
336 | struct power_table *pt = cpufreq_device->dyn_power_table; | |
337 | ||
338 | for (i = 1; i < cpufreq_device->dyn_power_table_entries; i++) | |
339 | if (freq < pt[i].frequency) | |
340 | break; | |
341 | ||
342 | return pt[i - 1].power; | |
343 | } | |
344 | ||
345 | static u32 cpu_power_to_freq(struct cpufreq_cooling_device *cpufreq_device, | |
346 | u32 power) | |
347 | { | |
348 | int i; | |
349 | struct power_table *pt = cpufreq_device->dyn_power_table; | |
350 | ||
351 | for (i = 1; i < cpufreq_device->dyn_power_table_entries; i++) | |
352 | if (power < pt[i].power) | |
353 | break; | |
354 | ||
355 | return pt[i - 1].frequency; | |
356 | } | |
357 | ||
358 | /** | |
359 | * get_load() - get load for a cpu since last updated | |
360 | * @cpufreq_device: &struct cpufreq_cooling_device for this cpu | |
361 | * @cpu: cpu number | |
362 | * | |
363 | * Return: The average load of cpu @cpu in percentage since this | |
364 | * function was last called. | |
365 | */ | |
366 | static u32 get_load(struct cpufreq_cooling_device *cpufreq_device, int cpu) | |
367 | { | |
368 | u32 load; | |
369 | u64 now, now_idle, delta_time, delta_idle; | |
370 | ||
371 | now_idle = get_cpu_idle_time(cpu, &now, 0); | |
372 | delta_idle = now_idle - cpufreq_device->time_in_idle[cpu]; | |
373 | delta_time = now - cpufreq_device->time_in_idle_timestamp[cpu]; | |
374 | ||
375 | if (delta_time <= delta_idle) | |
376 | load = 0; | |
377 | else | |
378 | load = div64_u64(100 * (delta_time - delta_idle), delta_time); | |
379 | ||
380 | cpufreq_device->time_in_idle[cpu] = now_idle; | |
381 | cpufreq_device->time_in_idle_timestamp[cpu] = now; | |
382 | ||
383 | return load; | |
384 | } | |
385 | ||
386 | /** | |
387 | * get_static_power() - calculate the static power consumed by the cpus | |
388 | * @cpufreq_device: struct &cpufreq_cooling_device for this cpu cdev | |
389 | * @tz: thermal zone device in which we're operating | |
390 | * @freq: frequency in KHz | |
391 | * @power: pointer in which to store the calculated static power | |
392 | * | |
393 | * Calculate the static power consumed by the cpus described by | |
394 | * @cpu_actor running at frequency @freq. This function relies on a | |
395 | * platform specific function that should have been provided when the | |
396 | * actor was registered. If it wasn't, the static power is assumed to | |
397 | * be negligible. The calculated static power is stored in @power. | |
398 | * | |
399 | * Return: 0 on success, -E* on failure. | |
400 | */ | |
401 | static int get_static_power(struct cpufreq_cooling_device *cpufreq_device, | |
402 | struct thermal_zone_device *tz, unsigned long freq, | |
403 | u32 *power) | |
404 | { | |
405 | struct dev_pm_opp *opp; | |
406 | unsigned long voltage; | |
407 | struct cpumask *cpumask = &cpufreq_device->allowed_cpus; | |
408 | unsigned long freq_hz = freq * 1000; | |
409 | ||
410 | if (!cpufreq_device->plat_get_static_power || | |
411 | !cpufreq_device->cpu_dev) { | |
412 | *power = 0; | |
413 | return 0; | |
414 | } | |
415 | ||
416 | rcu_read_lock(); | |
417 | ||
418 | opp = dev_pm_opp_find_freq_exact(cpufreq_device->cpu_dev, freq_hz, | |
419 | true); | |
420 | voltage = dev_pm_opp_get_voltage(opp); | |
421 | ||
422 | rcu_read_unlock(); | |
423 | ||
424 | if (voltage == 0) { | |
425 | dev_warn_ratelimited(cpufreq_device->cpu_dev, | |
426 | "Failed to get voltage for frequency %lu: %ld\n", | |
427 | freq_hz, IS_ERR(opp) ? PTR_ERR(opp) : 0); | |
428 | return -EINVAL; | |
429 | } | |
430 | ||
431 | return cpufreq_device->plat_get_static_power(cpumask, tz->passive_delay, | |
432 | voltage, power); | |
433 | } | |
434 | ||
435 | /** | |
436 | * get_dynamic_power() - calculate the dynamic power | |
437 | * @cpufreq_device: &cpufreq_cooling_device for this cdev | |
438 | * @freq: current frequency | |
439 | * | |
440 | * Return: the dynamic power consumed by the cpus described by | |
441 | * @cpufreq_device. | |
442 | */ | |
443 | static u32 get_dynamic_power(struct cpufreq_cooling_device *cpufreq_device, | |
444 | unsigned long freq) | |
445 | { | |
446 | u32 raw_cpu_power; | |
447 | ||
448 | raw_cpu_power = cpu_freq_to_power(cpufreq_device, freq); | |
449 | return (raw_cpu_power * cpufreq_device->last_load) / 100; | |
02361418 ADK |
450 | } |
451 | ||
1b9e3526 | 452 | /* cpufreq cooling device callback functions are defined below */ |
02361418 ADK |
453 | |
454 | /** | |
455 | * cpufreq_get_max_state - callback function to get the max cooling state. | |
456 | * @cdev: thermal cooling device pointer. | |
457 | * @state: fill this variable with the max cooling state. | |
62c00421 EV |
458 | * |
459 | * Callback for the thermal cooling device to return the cpufreq | |
460 | * max cooling state. | |
461 | * | |
462 | * Return: 0 on success, an error code otherwise. | |
02361418 ADK |
463 | */ |
464 | static int cpufreq_get_max_state(struct thermal_cooling_device *cdev, | |
465 | unsigned long *state) | |
466 | { | |
160b7d80 | 467 | struct cpufreq_cooling_device *cpufreq_device = cdev->devdata; |
9c51b05a | 468 | |
dcc6c7fd VK |
469 | *state = cpufreq_device->max_level; |
470 | return 0; | |
02361418 ADK |
471 | } |
472 | ||
473 | /** | |
474 | * cpufreq_get_cur_state - callback function to get the current cooling state. | |
475 | * @cdev: thermal cooling device pointer. | |
476 | * @state: fill this variable with the current cooling state. | |
3672552d EV |
477 | * |
478 | * Callback for the thermal cooling device to return the cpufreq | |
479 | * current cooling state. | |
480 | * | |
481 | * Return: 0 on success, an error code otherwise. | |
02361418 ADK |
482 | */ |
483 | static int cpufreq_get_cur_state(struct thermal_cooling_device *cdev, | |
484 | unsigned long *state) | |
485 | { | |
160b7d80 | 486 | struct cpufreq_cooling_device *cpufreq_device = cdev->devdata; |
02361418 | 487 | |
160b7d80 | 488 | *state = cpufreq_device->cpufreq_state; |
79491e53 | 489 | |
160b7d80 | 490 | return 0; |
02361418 ADK |
491 | } |
492 | ||
493 | /** | |
494 | * cpufreq_set_cur_state - callback function to set the current cooling state. | |
495 | * @cdev: thermal cooling device pointer. | |
496 | * @state: set this variable to the current cooling state. | |
56e05fdb EV |
497 | * |
498 | * Callback for the thermal cooling device to change the cpufreq | |
499 | * current cooling state. | |
500 | * | |
501 | * Return: 0 on success, an error code otherwise. | |
02361418 ADK |
502 | */ |
503 | static int cpufreq_set_cur_state(struct thermal_cooling_device *cdev, | |
504 | unsigned long state) | |
505 | { | |
160b7d80 | 506 | struct cpufreq_cooling_device *cpufreq_device = cdev->devdata; |
5194fe46 VK |
507 | unsigned int cpu = cpumask_any(&cpufreq_device->allowed_cpus); |
508 | unsigned int clip_freq; | |
4843c4a1 VK |
509 | |
510 | /* Request state should be less than max_level */ | |
511 | if (WARN_ON(state > cpufreq_device->max_level)) | |
512 | return -EINVAL; | |
5194fe46 VK |
513 | |
514 | /* Check if the old cooling action is same as new cooling action */ | |
515 | if (cpufreq_device->cpufreq_state == state) | |
516 | return 0; | |
02361418 | 517 | |
4843c4a1 | 518 | clip_freq = cpufreq_device->freq_table[state]; |
5194fe46 | 519 | cpufreq_device->cpufreq_state = state; |
59f0d218 | 520 | cpufreq_device->clipped_freq = clip_freq; |
5194fe46 VK |
521 | |
522 | cpufreq_update_policy(cpu); | |
523 | ||
524 | return 0; | |
02361418 ADK |
525 | } |
526 | ||
c36cf071 JM |
527 | /** |
528 | * cpufreq_get_requested_power() - get the current power | |
529 | * @cdev: &thermal_cooling_device pointer | |
530 | * @tz: a valid thermal zone device pointer | |
531 | * @power: pointer in which to store the resulting power | |
532 | * | |
533 | * Calculate the current power consumption of the cpus in milliwatts | |
534 | * and store it in @power. This function should actually calculate | |
535 | * the requested power, but it's hard to get the frequency that | |
536 | * cpufreq would have assigned if there were no thermal limits. | |
537 | * Instead, we calculate the current power on the assumption that the | |
538 | * immediate future will look like the immediate past. | |
539 | * | |
540 | * We use the current frequency and the average load since this | |
541 | * function was last called. In reality, there could have been | |
542 | * multiple opps since this function was last called and that affects | |
543 | * the load calculation. While it's not perfectly accurate, this | |
544 | * simplification is good enough and works. REVISIT this, as more | |
545 | * complex code may be needed if experiments show that it's not | |
546 | * accurate enough. | |
547 | * | |
548 | * Return: 0 on success, -E* if getting the static power failed. | |
549 | */ | |
550 | static int cpufreq_get_requested_power(struct thermal_cooling_device *cdev, | |
551 | struct thermal_zone_device *tz, | |
552 | u32 *power) | |
553 | { | |
554 | unsigned long freq; | |
6828a471 | 555 | int i = 0, cpu, ret; |
c36cf071 JM |
556 | u32 static_power, dynamic_power, total_load = 0; |
557 | struct cpufreq_cooling_device *cpufreq_device = cdev->devdata; | |
6828a471 | 558 | u32 *load_cpu = NULL; |
c36cf071 | 559 | |
dd658e02 KS |
560 | cpu = cpumask_any_and(&cpufreq_device->allowed_cpus, cpu_online_mask); |
561 | ||
562 | /* | |
563 | * All the CPUs are offline, thus the requested power by | |
564 | * the cdev is 0 | |
565 | */ | |
566 | if (cpu >= nr_cpu_ids) { | |
567 | *power = 0; | |
568 | return 0; | |
569 | } | |
570 | ||
571 | freq = cpufreq_quick_get(cpu); | |
c36cf071 | 572 | |
6828a471 JM |
573 | if (trace_thermal_power_cpu_get_power_enabled()) { |
574 | u32 ncpus = cpumask_weight(&cpufreq_device->allowed_cpus); | |
575 | ||
576 | load_cpu = devm_kcalloc(&cdev->device, ncpus, sizeof(*load_cpu), | |
577 | GFP_KERNEL); | |
578 | } | |
579 | ||
c36cf071 JM |
580 | for_each_cpu(cpu, &cpufreq_device->allowed_cpus) { |
581 | u32 load; | |
582 | ||
583 | if (cpu_online(cpu)) | |
584 | load = get_load(cpufreq_device, cpu); | |
585 | else | |
586 | load = 0; | |
587 | ||
588 | total_load += load; | |
6828a471 JM |
589 | if (trace_thermal_power_cpu_limit_enabled() && load_cpu) |
590 | load_cpu[i] = load; | |
591 | ||
592 | i++; | |
c36cf071 JM |
593 | } |
594 | ||
595 | cpufreq_device->last_load = total_load; | |
596 | ||
597 | dynamic_power = get_dynamic_power(cpufreq_device, freq); | |
598 | ret = get_static_power(cpufreq_device, tz, freq, &static_power); | |
6828a471 JM |
599 | if (ret) { |
600 | if (load_cpu) | |
601 | devm_kfree(&cdev->device, load_cpu); | |
c36cf071 | 602 | return ret; |
6828a471 JM |
603 | } |
604 | ||
605 | if (load_cpu) { | |
606 | trace_thermal_power_cpu_get_power( | |
607 | &cpufreq_device->allowed_cpus, | |
608 | freq, load_cpu, i, dynamic_power, static_power); | |
609 | ||
610 | devm_kfree(&cdev->device, load_cpu); | |
611 | } | |
c36cf071 JM |
612 | |
613 | *power = static_power + dynamic_power; | |
614 | return 0; | |
615 | } | |
616 | ||
617 | /** | |
618 | * cpufreq_state2power() - convert a cpu cdev state to power consumed | |
619 | * @cdev: &thermal_cooling_device pointer | |
620 | * @tz: a valid thermal zone device pointer | |
621 | * @state: cooling device state to be converted | |
622 | * @power: pointer in which to store the resulting power | |
623 | * | |
624 | * Convert cooling device state @state into power consumption in | |
625 | * milliwatts assuming 100% load. Store the calculated power in | |
626 | * @power. | |
627 | * | |
628 | * Return: 0 on success, -EINVAL if the cooling device state could not | |
629 | * be converted into a frequency or other -E* if there was an error | |
630 | * when calculating the static power. | |
631 | */ | |
632 | static int cpufreq_state2power(struct thermal_cooling_device *cdev, | |
633 | struct thermal_zone_device *tz, | |
634 | unsigned long state, u32 *power) | |
635 | { | |
636 | unsigned int freq, num_cpus; | |
637 | cpumask_t cpumask; | |
638 | u32 static_power, dynamic_power; | |
639 | int ret; | |
640 | struct cpufreq_cooling_device *cpufreq_device = cdev->devdata; | |
641 | ||
642 | cpumask_and(&cpumask, &cpufreq_device->allowed_cpus, cpu_online_mask); | |
643 | num_cpus = cpumask_weight(&cpumask); | |
644 | ||
645 | /* None of our cpus are online, so no power */ | |
646 | if (num_cpus == 0) { | |
647 | *power = 0; | |
648 | return 0; | |
649 | } | |
650 | ||
651 | freq = cpufreq_device->freq_table[state]; | |
652 | if (!freq) | |
653 | return -EINVAL; | |
654 | ||
655 | dynamic_power = cpu_freq_to_power(cpufreq_device, freq) * num_cpus; | |
656 | ret = get_static_power(cpufreq_device, tz, freq, &static_power); | |
657 | if (ret) | |
658 | return ret; | |
659 | ||
660 | *power = static_power + dynamic_power; | |
661 | return 0; | |
662 | } | |
663 | ||
664 | /** | |
665 | * cpufreq_power2state() - convert power to a cooling device state | |
666 | * @cdev: &thermal_cooling_device pointer | |
667 | * @tz: a valid thermal zone device pointer | |
668 | * @power: power in milliwatts to be converted | |
669 | * @state: pointer in which to store the resulting state | |
670 | * | |
671 | * Calculate a cooling device state for the cpus described by @cdev | |
672 | * that would allow them to consume at most @power mW and store it in | |
673 | * @state. Note that this calculation depends on external factors | |
674 | * such as the cpu load or the current static power. Calling this | |
675 | * function with the same power as input can yield different cooling | |
676 | * device states depending on those external factors. | |
677 | * | |
678 | * Return: 0 on success, -ENODEV if no cpus are online or -EINVAL if | |
679 | * the calculated frequency could not be converted to a valid state. | |
680 | * The latter should not happen unless the frequencies available to | |
681 | * cpufreq have changed since the initialization of the cpu cooling | |
682 | * device. | |
683 | */ | |
684 | static int cpufreq_power2state(struct thermal_cooling_device *cdev, | |
685 | struct thermal_zone_device *tz, u32 power, | |
686 | unsigned long *state) | |
687 | { | |
688 | unsigned int cpu, cur_freq, target_freq; | |
689 | int ret; | |
690 | s32 dyn_power; | |
691 | u32 last_load, normalised_power, static_power; | |
692 | struct cpufreq_cooling_device *cpufreq_device = cdev->devdata; | |
693 | ||
694 | cpu = cpumask_any_and(&cpufreq_device->allowed_cpus, cpu_online_mask); | |
695 | ||
696 | /* None of our cpus are online */ | |
697 | if (cpu >= nr_cpu_ids) | |
698 | return -ENODEV; | |
699 | ||
700 | cur_freq = cpufreq_quick_get(cpu); | |
701 | ret = get_static_power(cpufreq_device, tz, cur_freq, &static_power); | |
702 | if (ret) | |
703 | return ret; | |
704 | ||
705 | dyn_power = power - static_power; | |
706 | dyn_power = dyn_power > 0 ? dyn_power : 0; | |
707 | last_load = cpufreq_device->last_load ?: 1; | |
708 | normalised_power = (dyn_power * 100) / last_load; | |
709 | target_freq = cpu_power_to_freq(cpufreq_device, normalised_power); | |
710 | ||
711 | *state = cpufreq_cooling_get_level(cpu, target_freq); | |
712 | if (*state == THERMAL_CSTATE_INVALID) { | |
713 | dev_warn_ratelimited(&cdev->device, | |
714 | "Failed to convert %dKHz for cpu %d into a cdev state\n", | |
715 | target_freq, cpu); | |
716 | return -EINVAL; | |
717 | } | |
718 | ||
6828a471 JM |
719 | trace_thermal_power_cpu_limit(&cpufreq_device->allowed_cpus, |
720 | target_freq, *state, power); | |
c36cf071 JM |
721 | return 0; |
722 | } | |
723 | ||
02361418 | 724 | /* Bind cpufreq callbacks to thermal cooling device ops */ |
c36cf071 | 725 | static struct thermal_cooling_device_ops cpufreq_cooling_ops = { |
02361418 ADK |
726 | .get_max_state = cpufreq_get_max_state, |
727 | .get_cur_state = cpufreq_get_cur_state, | |
728 | .set_cur_state = cpufreq_set_cur_state, | |
729 | }; | |
730 | ||
731 | /* Notifier for cpufreq policy change */ | |
732 | static struct notifier_block thermal_cpufreq_notifier_block = { | |
733 | .notifier_call = cpufreq_thermal_notifier, | |
734 | }; | |
735 | ||
f6859014 VK |
736 | static unsigned int find_next_max(struct cpufreq_frequency_table *table, |
737 | unsigned int prev_max) | |
738 | { | |
739 | struct cpufreq_frequency_table *pos; | |
740 | unsigned int max = 0; | |
741 | ||
742 | cpufreq_for_each_valid_entry(pos, table) { | |
743 | if (pos->frequency > max && pos->frequency < prev_max) | |
744 | max = pos->frequency; | |
745 | } | |
746 | ||
747 | return max; | |
748 | } | |
749 | ||
02361418 | 750 | /** |
39d99cff EV |
751 | * __cpufreq_cooling_register - helper function to create cpufreq cooling device |
752 | * @np: a valid struct device_node to the cooling device device tree node | |
02361418 | 753 | * @clip_cpus: cpumask of cpus where the frequency constraints will happen. |
405fb825 | 754 | * Normally this should be same as cpufreq policy->related_cpus. |
c36cf071 JM |
755 | * @capacitance: dynamic power coefficient for these cpus |
756 | * @plat_static_func: function to calculate the static power consumed by these | |
757 | * cpus (optional) | |
12cb08ba EV |
758 | * |
759 | * This interface function registers the cpufreq cooling device with the name | |
760 | * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq | |
39d99cff EV |
761 | * cooling devices. It also gives the opportunity to link the cooling device |
762 | * with a device tree node, in order to bind it via the thermal DT code. | |
12cb08ba EV |
763 | * |
764 | * Return: a valid struct thermal_cooling_device pointer on success, | |
765 | * on failure, it returns a corresponding ERR_PTR(). | |
02361418 | 766 | */ |
39d99cff EV |
767 | static struct thermal_cooling_device * |
768 | __cpufreq_cooling_register(struct device_node *np, | |
c36cf071 JM |
769 | const struct cpumask *clip_cpus, u32 capacitance, |
770 | get_static_t plat_static_func) | |
02361418 ADK |
771 | { |
772 | struct thermal_cooling_device *cool_dev; | |
5d3bdb89 | 773 | struct cpufreq_cooling_device *cpufreq_dev; |
02361418 | 774 | char dev_name[THERMAL_NAME_LENGTH]; |
dcc6c7fd | 775 | struct cpufreq_frequency_table *pos, *table; |
c36cf071 | 776 | unsigned int freq, i, num_cpus; |
405fb825 | 777 | int ret; |
02361418 | 778 | |
dcc6c7fd VK |
779 | table = cpufreq_frequency_get_table(cpumask_first(clip_cpus)); |
780 | if (!table) { | |
0f1be51c EV |
781 | pr_debug("%s: CPUFreq table not found\n", __func__); |
782 | return ERR_PTR(-EPROBE_DEFER); | |
02361418 | 783 | } |
0f1be51c | 784 | |
98d522f0 | 785 | cpufreq_dev = kzalloc(sizeof(*cpufreq_dev), GFP_KERNEL); |
02361418 ADK |
786 | if (!cpufreq_dev) |
787 | return ERR_PTR(-ENOMEM); | |
788 | ||
c36cf071 JM |
789 | num_cpus = cpumask_weight(clip_cpus); |
790 | cpufreq_dev->time_in_idle = kcalloc(num_cpus, | |
791 | sizeof(*cpufreq_dev->time_in_idle), | |
792 | GFP_KERNEL); | |
793 | if (!cpufreq_dev->time_in_idle) { | |
794 | cool_dev = ERR_PTR(-ENOMEM); | |
795 | goto free_cdev; | |
796 | } | |
797 | ||
798 | cpufreq_dev->time_in_idle_timestamp = | |
799 | kcalloc(num_cpus, sizeof(*cpufreq_dev->time_in_idle_timestamp), | |
800 | GFP_KERNEL); | |
801 | if (!cpufreq_dev->time_in_idle_timestamp) { | |
802 | cool_dev = ERR_PTR(-ENOMEM); | |
803 | goto free_time_in_idle; | |
804 | } | |
805 | ||
dcc6c7fd VK |
806 | /* Find max levels */ |
807 | cpufreq_for_each_valid_entry(pos, table) | |
808 | cpufreq_dev->max_level++; | |
809 | ||
f6859014 VK |
810 | cpufreq_dev->freq_table = kmalloc(sizeof(*cpufreq_dev->freq_table) * |
811 | cpufreq_dev->max_level, GFP_KERNEL); | |
812 | if (!cpufreq_dev->freq_table) { | |
f6859014 | 813 | cool_dev = ERR_PTR(-ENOMEM); |
c36cf071 | 814 | goto free_time_in_idle_timestamp; |
f6859014 VK |
815 | } |
816 | ||
dcc6c7fd VK |
817 | /* max_level is an index, not a counter */ |
818 | cpufreq_dev->max_level--; | |
819 | ||
02361418 ADK |
820 | cpumask_copy(&cpufreq_dev->allowed_cpus, clip_cpus); |
821 | ||
c36cf071 JM |
822 | if (capacitance) { |
823 | cpufreq_cooling_ops.get_requested_power = | |
824 | cpufreq_get_requested_power; | |
825 | cpufreq_cooling_ops.state2power = cpufreq_state2power; | |
826 | cpufreq_cooling_ops.power2state = cpufreq_power2state; | |
827 | cpufreq_dev->plat_get_static_power = plat_static_func; | |
828 | ||
829 | ret = build_dyn_power_table(cpufreq_dev, capacitance); | |
830 | if (ret) { | |
831 | cool_dev = ERR_PTR(ret); | |
832 | goto free_table; | |
833 | } | |
834 | } | |
835 | ||
02361418 ADK |
836 | ret = get_idr(&cpufreq_idr, &cpufreq_dev->id); |
837 | if (ret) { | |
730abe06 | 838 | cool_dev = ERR_PTR(ret); |
f6859014 | 839 | goto free_table; |
02361418 ADK |
840 | } |
841 | ||
99871a71 EV |
842 | snprintf(dev_name, sizeof(dev_name), "thermal-cpufreq-%d", |
843 | cpufreq_dev->id); | |
02361418 | 844 | |
39d99cff EV |
845 | cool_dev = thermal_of_cooling_device_register(np, dev_name, cpufreq_dev, |
846 | &cpufreq_cooling_ops); | |
730abe06 VK |
847 | if (IS_ERR(cool_dev)) |
848 | goto remove_idr; | |
849 | ||
f6859014 VK |
850 | /* Fill freq-table in descending order of frequencies */ |
851 | for (i = 0, freq = -1; i <= cpufreq_dev->max_level; i++) { | |
852 | freq = find_next_max(table, freq); | |
853 | cpufreq_dev->freq_table[i] = freq; | |
854 | ||
855 | /* Warn for duplicate entries */ | |
856 | if (!freq) | |
857 | pr_warn("%s: table has duplicate entries\n", __func__); | |
858 | else | |
859 | pr_debug("%s: freq:%u KHz\n", __func__, freq); | |
02361418 | 860 | } |
f6859014 | 861 | |
59f0d218 | 862 | cpufreq_dev->clipped_freq = cpufreq_dev->freq_table[0]; |
02361418 | 863 | cpufreq_dev->cool_dev = cool_dev; |
92e615ec | 864 | |
02361418 | 865 | mutex_lock(&cooling_cpufreq_lock); |
02361418 | 866 | |
02373d7c RK |
867 | mutex_lock(&cooling_list_lock); |
868 | list_add(&cpufreq_dev->node, &cpufreq_dev_list); | |
869 | mutex_unlock(&cooling_list_lock); | |
870 | ||
02361418 | 871 | /* Register the notifier for first cpufreq cooling device */ |
02373d7c | 872 | if (!cpufreq_dev_count++) |
02361418 | 873 | cpufreq_register_notifier(&thermal_cpufreq_notifier_block, |
5fda7f68 | 874 | CPUFREQ_POLICY_NOTIFIER); |
02361418 | 875 | mutex_unlock(&cooling_cpufreq_lock); |
79491e53 | 876 | |
730abe06 VK |
877 | return cool_dev; |
878 | ||
879 | remove_idr: | |
880 | release_idr(&cpufreq_idr, cpufreq_dev->id); | |
f6859014 VK |
881 | free_table: |
882 | kfree(cpufreq_dev->freq_table); | |
c36cf071 JM |
883 | free_time_in_idle_timestamp: |
884 | kfree(cpufreq_dev->time_in_idle_timestamp); | |
885 | free_time_in_idle: | |
886 | kfree(cpufreq_dev->time_in_idle); | |
730abe06 VK |
887 | free_cdev: |
888 | kfree(cpufreq_dev); | |
889 | ||
02361418 ADK |
890 | return cool_dev; |
891 | } | |
39d99cff EV |
892 | |
893 | /** | |
894 | * cpufreq_cooling_register - function to create cpufreq cooling device. | |
895 | * @clip_cpus: cpumask of cpus where the frequency constraints will happen. | |
896 | * | |
897 | * This interface function registers the cpufreq cooling device with the name | |
898 | * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq | |
899 | * cooling devices. | |
900 | * | |
901 | * Return: a valid struct thermal_cooling_device pointer on success, | |
902 | * on failure, it returns a corresponding ERR_PTR(). | |
903 | */ | |
904 | struct thermal_cooling_device * | |
905 | cpufreq_cooling_register(const struct cpumask *clip_cpus) | |
906 | { | |
c36cf071 | 907 | return __cpufreq_cooling_register(NULL, clip_cpus, 0, NULL); |
39d99cff | 908 | } |
243dbd9c | 909 | EXPORT_SYMBOL_GPL(cpufreq_cooling_register); |
02361418 | 910 | |
39d99cff EV |
911 | /** |
912 | * of_cpufreq_cooling_register - function to create cpufreq cooling device. | |
913 | * @np: a valid struct device_node to the cooling device device tree node | |
914 | * @clip_cpus: cpumask of cpus where the frequency constraints will happen. | |
915 | * | |
916 | * This interface function registers the cpufreq cooling device with the name | |
917 | * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq | |
918 | * cooling devices. Using this API, the cpufreq cooling device will be | |
919 | * linked to the device tree node provided. | |
920 | * | |
921 | * Return: a valid struct thermal_cooling_device pointer on success, | |
922 | * on failure, it returns a corresponding ERR_PTR(). | |
923 | */ | |
924 | struct thermal_cooling_device * | |
925 | of_cpufreq_cooling_register(struct device_node *np, | |
926 | const struct cpumask *clip_cpus) | |
927 | { | |
928 | if (!np) | |
929 | return ERR_PTR(-EINVAL); | |
930 | ||
c36cf071 | 931 | return __cpufreq_cooling_register(np, clip_cpus, 0, NULL); |
39d99cff EV |
932 | } |
933 | EXPORT_SYMBOL_GPL(of_cpufreq_cooling_register); | |
934 | ||
c36cf071 JM |
935 | /** |
936 | * cpufreq_power_cooling_register() - create cpufreq cooling device with power extensions | |
937 | * @clip_cpus: cpumask of cpus where the frequency constraints will happen | |
938 | * @capacitance: dynamic power coefficient for these cpus | |
939 | * @plat_static_func: function to calculate the static power consumed by these | |
940 | * cpus (optional) | |
941 | * | |
942 | * This interface function registers the cpufreq cooling device with | |
943 | * the name "thermal-cpufreq-%x". This api can support multiple | |
944 | * instances of cpufreq cooling devices. Using this function, the | |
945 | * cooling device will implement the power extensions by using a | |
946 | * simple cpu power model. The cpus must have registered their OPPs | |
947 | * using the OPP library. | |
948 | * | |
949 | * An optional @plat_static_func may be provided to calculate the | |
950 | * static power consumed by these cpus. If the platform's static | |
951 | * power consumption is unknown or negligible, make it NULL. | |
952 | * | |
953 | * Return: a valid struct thermal_cooling_device pointer on success, | |
954 | * on failure, it returns a corresponding ERR_PTR(). | |
955 | */ | |
956 | struct thermal_cooling_device * | |
957 | cpufreq_power_cooling_register(const struct cpumask *clip_cpus, u32 capacitance, | |
958 | get_static_t plat_static_func) | |
959 | { | |
960 | return __cpufreq_cooling_register(NULL, clip_cpus, capacitance, | |
961 | plat_static_func); | |
962 | } | |
963 | EXPORT_SYMBOL(cpufreq_power_cooling_register); | |
964 | ||
965 | /** | |
966 | * of_cpufreq_power_cooling_register() - create cpufreq cooling device with power extensions | |
967 | * @np: a valid struct device_node to the cooling device device tree node | |
968 | * @clip_cpus: cpumask of cpus where the frequency constraints will happen | |
969 | * @capacitance: dynamic power coefficient for these cpus | |
970 | * @plat_static_func: function to calculate the static power consumed by these | |
971 | * cpus (optional) | |
972 | * | |
973 | * This interface function registers the cpufreq cooling device with | |
974 | * the name "thermal-cpufreq-%x". This api can support multiple | |
975 | * instances of cpufreq cooling devices. Using this API, the cpufreq | |
976 | * cooling device will be linked to the device tree node provided. | |
977 | * Using this function, the cooling device will implement the power | |
978 | * extensions by using a simple cpu power model. The cpus must have | |
979 | * registered their OPPs using the OPP library. | |
980 | * | |
981 | * An optional @plat_static_func may be provided to calculate the | |
982 | * static power consumed by these cpus. If the platform's static | |
983 | * power consumption is unknown or negligible, make it NULL. | |
984 | * | |
985 | * Return: a valid struct thermal_cooling_device pointer on success, | |
986 | * on failure, it returns a corresponding ERR_PTR(). | |
987 | */ | |
988 | struct thermal_cooling_device * | |
989 | of_cpufreq_power_cooling_register(struct device_node *np, | |
990 | const struct cpumask *clip_cpus, | |
991 | u32 capacitance, | |
992 | get_static_t plat_static_func) | |
993 | { | |
994 | if (!np) | |
995 | return ERR_PTR(-EINVAL); | |
996 | ||
997 | return __cpufreq_cooling_register(np, clip_cpus, capacitance, | |
998 | plat_static_func); | |
999 | } | |
1000 | EXPORT_SYMBOL(of_cpufreq_power_cooling_register); | |
1001 | ||
02361418 ADK |
1002 | /** |
1003 | * cpufreq_cooling_unregister - function to remove cpufreq cooling device. | |
1004 | * @cdev: thermal cooling device pointer. | |
135266b4 EV |
1005 | * |
1006 | * This interface function unregisters the "thermal-cpufreq-%x" cooling device. | |
02361418 ADK |
1007 | */ |
1008 | void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev) | |
1009 | { | |
50e66c7e | 1010 | struct cpufreq_cooling_device *cpufreq_dev; |
02361418 | 1011 | |
50e66c7e EV |
1012 | if (!cdev) |
1013 | return; | |
1014 | ||
1015 | cpufreq_dev = cdev->devdata; | |
02361418 ADK |
1016 | |
1017 | /* Unregister the notifier for the last cpufreq cooling device */ | |
02373d7c RK |
1018 | mutex_lock(&cooling_cpufreq_lock); |
1019 | if (!--cpufreq_dev_count) | |
02361418 | 1020 | cpufreq_unregister_notifier(&thermal_cpufreq_notifier_block, |
5fda7f68 | 1021 | CPUFREQ_POLICY_NOTIFIER); |
02373d7c RK |
1022 | |
1023 | mutex_lock(&cooling_list_lock); | |
1024 | list_del(&cpufreq_dev->node); | |
1025 | mutex_unlock(&cooling_list_lock); | |
1026 | ||
02361418 | 1027 | mutex_unlock(&cooling_cpufreq_lock); |
160b7d80 | 1028 | |
02361418 ADK |
1029 | thermal_cooling_device_unregister(cpufreq_dev->cool_dev); |
1030 | release_idr(&cpufreq_idr, cpufreq_dev->id); | |
c36cf071 JM |
1031 | kfree(cpufreq_dev->time_in_idle_timestamp); |
1032 | kfree(cpufreq_dev->time_in_idle); | |
f6859014 | 1033 | kfree(cpufreq_dev->freq_table); |
02361418 ADK |
1034 | kfree(cpufreq_dev); |
1035 | } | |
243dbd9c | 1036 | EXPORT_SYMBOL_GPL(cpufreq_cooling_unregister); |