Commit | Line | Data |
---|---|---|
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 | |
1afb9c53 VK |
232 | /* |
233 | * policy->max is the maximum allowed frequency defined by user | |
234 | * and clipped_freq is the maximum that thermal constraints | |
235 | * allow. | |
236 | * | |
237 | * If clipped_freq is lower than policy->max, then we need to | |
238 | * readjust policy->max. | |
239 | * | |
240 | * But, if clipped_freq is greater than policy->max, we don't | |
241 | * need to do anything. | |
242 | */ | |
abcbcc25 | 243 | clipped_freq = cpufreq_dev->clipped_freq; |
c36cf071 | 244 | |
1afb9c53 | 245 | if (policy->max > clipped_freq) |
abcbcc25 | 246 | cpufreq_verify_within_limits(policy, 0, clipped_freq); |
c36cf071 | 247 | break; |
c36cf071 | 248 | } |
a24af233 | 249 | mutex_unlock(&cooling_list_lock); |
c36cf071 JM |
250 | |
251 | return NOTIFY_OK; | |
252 | } | |
253 | ||
254 | /** | |
255 | * build_dyn_power_table() - create a dynamic power to frequency table | |
256 | * @cpufreq_device: the cpufreq cooling device in which to store the table | |
257 | * @capacitance: dynamic power coefficient for these cpus | |
258 | * | |
259 | * Build a dynamic power to frequency table for this cpu and store it | |
260 | * in @cpufreq_device. This table will be used in cpu_power_to_freq() and | |
261 | * cpu_freq_to_power() to convert between power and frequency | |
262 | * efficiently. Power is stored in mW, frequency in KHz. The | |
263 | * resulting table is in ascending order. | |
264 | * | |
459ac375 JM |
265 | * Return: 0 on success, -EINVAL if there are no OPPs for any CPUs, |
266 | * -ENOMEM if we run out of memory or -EAGAIN if an OPP was | |
267 | * added/enabled while the function was executing. | |
c36cf071 JM |
268 | */ |
269 | static int build_dyn_power_table(struct cpufreq_cooling_device *cpufreq_device, | |
270 | u32 capacitance) | |
271 | { | |
272 | struct power_table *power_table; | |
273 | struct dev_pm_opp *opp; | |
274 | struct device *dev = NULL; | |
eba4f88d | 275 | int num_opps = 0, cpu, i, ret = 0; |
c36cf071 JM |
276 | unsigned long freq; |
277 | ||
c36cf071 JM |
278 | for_each_cpu(cpu, &cpufreq_device->allowed_cpus) { |
279 | dev = get_cpu_device(cpu); | |
280 | if (!dev) { | |
281 | dev_warn(&cpufreq_device->cool_dev->device, | |
282 | "No cpu device for cpu %d\n", cpu); | |
2dcd851f | 283 | continue; |
c36cf071 | 284 | } |
2dcd851f | 285 | |
c36cf071 | 286 | num_opps = dev_pm_opp_get_opp_count(dev); |
459ac375 | 287 | if (num_opps > 0) |
c36cf071 | 288 | break; |
459ac375 JM |
289 | else if (num_opps < 0) |
290 | return num_opps; | |
c36cf071 | 291 | } |
02361418 | 292 | |
459ac375 JM |
293 | if (num_opps == 0) |
294 | return -EINVAL; | |
02361418 | 295 | |
c36cf071 | 296 | power_table = kcalloc(num_opps, sizeof(*power_table), GFP_KERNEL); |
459ac375 JM |
297 | if (!power_table) |
298 | return -ENOMEM; | |
299 | ||
300 | rcu_read_lock(); | |
c36cf071 JM |
301 | |
302 | for (freq = 0, i = 0; | |
303 | opp = dev_pm_opp_find_freq_ceil(dev, &freq), !IS_ERR(opp); | |
304 | freq++, i++) { | |
305 | u32 freq_mhz, voltage_mv; | |
306 | u64 power; | |
307 | ||
459ac375 JM |
308 | if (i >= num_opps) { |
309 | rcu_read_unlock(); | |
eba4f88d JM |
310 | ret = -EAGAIN; |
311 | goto free_power_table; | |
459ac375 JM |
312 | } |
313 | ||
c36cf071 JM |
314 | freq_mhz = freq / 1000000; |
315 | voltage_mv = dev_pm_opp_get_voltage(opp) / 1000; | |
316 | ||
317 | /* | |
318 | * Do the multiplication with MHz and millivolt so as | |
319 | * to not overflow. | |
320 | */ | |
321 | power = (u64)capacitance * freq_mhz * voltage_mv * voltage_mv; | |
322 | do_div(power, 1000000000); | |
323 | ||
324 | /* frequency is stored in power_table in KHz */ | |
325 | power_table[i].frequency = freq / 1000; | |
326 | ||
327 | /* power is stored in mW */ | |
328 | power_table[i].power = power; | |
329 | } | |
330 | ||
459ac375 JM |
331 | rcu_read_unlock(); |
332 | ||
eba4f88d JM |
333 | if (i != num_opps) { |
334 | ret = PTR_ERR(opp); | |
335 | goto free_power_table; | |
336 | } | |
c36cf071 JM |
337 | |
338 | cpufreq_device->cpu_dev = dev; | |
339 | cpufreq_device->dyn_power_table = power_table; | |
340 | cpufreq_device->dyn_power_table_entries = i; | |
341 | ||
459ac375 | 342 | return 0; |
eba4f88d JM |
343 | |
344 | free_power_table: | |
345 | kfree(power_table); | |
346 | ||
347 | return ret; | |
c36cf071 JM |
348 | } |
349 | ||
350 | static u32 cpu_freq_to_power(struct cpufreq_cooling_device *cpufreq_device, | |
351 | u32 freq) | |
352 | { | |
353 | int i; | |
354 | struct power_table *pt = cpufreq_device->dyn_power_table; | |
355 | ||
356 | for (i = 1; i < cpufreq_device->dyn_power_table_entries; i++) | |
357 | if (freq < pt[i].frequency) | |
358 | break; | |
359 | ||
360 | return pt[i - 1].power; | |
361 | } | |
362 | ||
363 | static u32 cpu_power_to_freq(struct cpufreq_cooling_device *cpufreq_device, | |
364 | u32 power) | |
365 | { | |
366 | int i; | |
367 | struct power_table *pt = cpufreq_device->dyn_power_table; | |
368 | ||
369 | for (i = 1; i < cpufreq_device->dyn_power_table_entries; i++) | |
370 | if (power < pt[i].power) | |
371 | break; | |
372 | ||
373 | return pt[i - 1].frequency; | |
374 | } | |
375 | ||
376 | /** | |
377 | * get_load() - get load for a cpu since last updated | |
378 | * @cpufreq_device: &struct cpufreq_cooling_device for this cpu | |
379 | * @cpu: cpu number | |
a53b8394 | 380 | * @cpu_idx: index of the cpu in cpufreq_device->allowed_cpus |
c36cf071 JM |
381 | * |
382 | * Return: The average load of cpu @cpu in percentage since this | |
383 | * function was last called. | |
384 | */ | |
a53b8394 JM |
385 | static u32 get_load(struct cpufreq_cooling_device *cpufreq_device, int cpu, |
386 | int cpu_idx) | |
c36cf071 JM |
387 | { |
388 | u32 load; | |
389 | u64 now, now_idle, delta_time, delta_idle; | |
390 | ||
391 | now_idle = get_cpu_idle_time(cpu, &now, 0); | |
a53b8394 JM |
392 | delta_idle = now_idle - cpufreq_device->time_in_idle[cpu_idx]; |
393 | delta_time = now - cpufreq_device->time_in_idle_timestamp[cpu_idx]; | |
c36cf071 JM |
394 | |
395 | if (delta_time <= delta_idle) | |
396 | load = 0; | |
397 | else | |
398 | load = div64_u64(100 * (delta_time - delta_idle), delta_time); | |
399 | ||
a53b8394 JM |
400 | cpufreq_device->time_in_idle[cpu_idx] = now_idle; |
401 | cpufreq_device->time_in_idle_timestamp[cpu_idx] = now; | |
c36cf071 JM |
402 | |
403 | return load; | |
404 | } | |
405 | ||
406 | /** | |
407 | * get_static_power() - calculate the static power consumed by the cpus | |
408 | * @cpufreq_device: struct &cpufreq_cooling_device for this cpu cdev | |
409 | * @tz: thermal zone device in which we're operating | |
410 | * @freq: frequency in KHz | |
411 | * @power: pointer in which to store the calculated static power | |
412 | * | |
413 | * Calculate the static power consumed by the cpus described by | |
414 | * @cpu_actor running at frequency @freq. This function relies on a | |
415 | * platform specific function that should have been provided when the | |
416 | * actor was registered. If it wasn't, the static power is assumed to | |
417 | * be negligible. The calculated static power is stored in @power. | |
418 | * | |
419 | * Return: 0 on success, -E* on failure. | |
420 | */ | |
421 | static int get_static_power(struct cpufreq_cooling_device *cpufreq_device, | |
422 | struct thermal_zone_device *tz, unsigned long freq, | |
423 | u32 *power) | |
424 | { | |
425 | struct dev_pm_opp *opp; | |
426 | unsigned long voltage; | |
427 | struct cpumask *cpumask = &cpufreq_device->allowed_cpus; | |
428 | unsigned long freq_hz = freq * 1000; | |
429 | ||
430 | if (!cpufreq_device->plat_get_static_power || | |
431 | !cpufreq_device->cpu_dev) { | |
432 | *power = 0; | |
433 | return 0; | |
434 | } | |
435 | ||
436 | rcu_read_lock(); | |
437 | ||
438 | opp = dev_pm_opp_find_freq_exact(cpufreq_device->cpu_dev, freq_hz, | |
439 | true); | |
440 | voltage = dev_pm_opp_get_voltage(opp); | |
441 | ||
442 | rcu_read_unlock(); | |
443 | ||
444 | if (voltage == 0) { | |
445 | dev_warn_ratelimited(cpufreq_device->cpu_dev, | |
446 | "Failed to get voltage for frequency %lu: %ld\n", | |
447 | freq_hz, IS_ERR(opp) ? PTR_ERR(opp) : 0); | |
448 | return -EINVAL; | |
449 | } | |
450 | ||
451 | return cpufreq_device->plat_get_static_power(cpumask, tz->passive_delay, | |
452 | voltage, power); | |
453 | } | |
454 | ||
455 | /** | |
456 | * get_dynamic_power() - calculate the dynamic power | |
457 | * @cpufreq_device: &cpufreq_cooling_device for this cdev | |
458 | * @freq: current frequency | |
459 | * | |
460 | * Return: the dynamic power consumed by the cpus described by | |
461 | * @cpufreq_device. | |
462 | */ | |
463 | static u32 get_dynamic_power(struct cpufreq_cooling_device *cpufreq_device, | |
464 | unsigned long freq) | |
465 | { | |
466 | u32 raw_cpu_power; | |
467 | ||
468 | raw_cpu_power = cpu_freq_to_power(cpufreq_device, freq); | |
469 | return (raw_cpu_power * cpufreq_device->last_load) / 100; | |
02361418 ADK |
470 | } |
471 | ||
1b9e3526 | 472 | /* cpufreq cooling device callback functions are defined below */ |
02361418 ADK |
473 | |
474 | /** | |
475 | * cpufreq_get_max_state - callback function to get the max cooling state. | |
476 | * @cdev: thermal cooling device pointer. | |
477 | * @state: fill this variable with the max cooling state. | |
62c00421 EV |
478 | * |
479 | * Callback for the thermal cooling device to return the cpufreq | |
480 | * max cooling state. | |
481 | * | |
482 | * Return: 0 on success, an error code otherwise. | |
02361418 ADK |
483 | */ |
484 | static int cpufreq_get_max_state(struct thermal_cooling_device *cdev, | |
485 | unsigned long *state) | |
486 | { | |
160b7d80 | 487 | struct cpufreq_cooling_device *cpufreq_device = cdev->devdata; |
9c51b05a | 488 | |
dcc6c7fd VK |
489 | *state = cpufreq_device->max_level; |
490 | return 0; | |
02361418 ADK |
491 | } |
492 | ||
493 | /** | |
494 | * cpufreq_get_cur_state - callback function to get the current cooling state. | |
495 | * @cdev: thermal cooling device pointer. | |
496 | * @state: fill this variable with the current cooling state. | |
3672552d EV |
497 | * |
498 | * Callback for the thermal cooling device to return the cpufreq | |
499 | * current cooling state. | |
500 | * | |
501 | * Return: 0 on success, an error code otherwise. | |
02361418 ADK |
502 | */ |
503 | static int cpufreq_get_cur_state(struct thermal_cooling_device *cdev, | |
504 | unsigned long *state) | |
505 | { | |
160b7d80 | 506 | struct cpufreq_cooling_device *cpufreq_device = cdev->devdata; |
02361418 | 507 | |
160b7d80 | 508 | *state = cpufreq_device->cpufreq_state; |
79491e53 | 509 | |
160b7d80 | 510 | return 0; |
02361418 ADK |
511 | } |
512 | ||
513 | /** | |
514 | * cpufreq_set_cur_state - callback function to set the current cooling state. | |
515 | * @cdev: thermal cooling device pointer. | |
516 | * @state: set this variable to the current cooling state. | |
56e05fdb EV |
517 | * |
518 | * Callback for the thermal cooling device to change the cpufreq | |
519 | * current cooling state. | |
520 | * | |
521 | * Return: 0 on success, an error code otherwise. | |
02361418 ADK |
522 | */ |
523 | static int cpufreq_set_cur_state(struct thermal_cooling_device *cdev, | |
524 | unsigned long state) | |
525 | { | |
160b7d80 | 526 | struct cpufreq_cooling_device *cpufreq_device = cdev->devdata; |
5194fe46 VK |
527 | unsigned int cpu = cpumask_any(&cpufreq_device->allowed_cpus); |
528 | unsigned int clip_freq; | |
4843c4a1 VK |
529 | |
530 | /* Request state should be less than max_level */ | |
531 | if (WARN_ON(state > cpufreq_device->max_level)) | |
532 | return -EINVAL; | |
5194fe46 VK |
533 | |
534 | /* Check if the old cooling action is same as new cooling action */ | |
535 | if (cpufreq_device->cpufreq_state == state) | |
536 | return 0; | |
02361418 | 537 | |
4843c4a1 | 538 | clip_freq = cpufreq_device->freq_table[state]; |
5194fe46 | 539 | cpufreq_device->cpufreq_state = state; |
59f0d218 | 540 | cpufreq_device->clipped_freq = clip_freq; |
5194fe46 VK |
541 | |
542 | cpufreq_update_policy(cpu); | |
543 | ||
544 | return 0; | |
02361418 ADK |
545 | } |
546 | ||
c36cf071 JM |
547 | /** |
548 | * cpufreq_get_requested_power() - get the current power | |
549 | * @cdev: &thermal_cooling_device pointer | |
550 | * @tz: a valid thermal zone device pointer | |
551 | * @power: pointer in which to store the resulting power | |
552 | * | |
553 | * Calculate the current power consumption of the cpus in milliwatts | |
554 | * and store it in @power. This function should actually calculate | |
555 | * the requested power, but it's hard to get the frequency that | |
556 | * cpufreq would have assigned if there were no thermal limits. | |
557 | * Instead, we calculate the current power on the assumption that the | |
558 | * immediate future will look like the immediate past. | |
559 | * | |
560 | * We use the current frequency and the average load since this | |
561 | * function was last called. In reality, there could have been | |
562 | * multiple opps since this function was last called and that affects | |
563 | * the load calculation. While it's not perfectly accurate, this | |
564 | * simplification is good enough and works. REVISIT this, as more | |
565 | * complex code may be needed if experiments show that it's not | |
566 | * accurate enough. | |
567 | * | |
568 | * Return: 0 on success, -E* if getting the static power failed. | |
569 | */ | |
570 | static int cpufreq_get_requested_power(struct thermal_cooling_device *cdev, | |
571 | struct thermal_zone_device *tz, | |
572 | u32 *power) | |
573 | { | |
574 | unsigned long freq; | |
6828a471 | 575 | int i = 0, cpu, ret; |
c36cf071 JM |
576 | u32 static_power, dynamic_power, total_load = 0; |
577 | struct cpufreq_cooling_device *cpufreq_device = cdev->devdata; | |
6828a471 | 578 | u32 *load_cpu = NULL; |
c36cf071 | 579 | |
dd658e02 KS |
580 | cpu = cpumask_any_and(&cpufreq_device->allowed_cpus, cpu_online_mask); |
581 | ||
582 | /* | |
583 | * All the CPUs are offline, thus the requested power by | |
584 | * the cdev is 0 | |
585 | */ | |
586 | if (cpu >= nr_cpu_ids) { | |
587 | *power = 0; | |
588 | return 0; | |
589 | } | |
590 | ||
591 | freq = cpufreq_quick_get(cpu); | |
c36cf071 | 592 | |
6828a471 JM |
593 | if (trace_thermal_power_cpu_get_power_enabled()) { |
594 | u32 ncpus = cpumask_weight(&cpufreq_device->allowed_cpus); | |
595 | ||
a71544cd | 596 | load_cpu = kcalloc(ncpus, sizeof(*load_cpu), GFP_KERNEL); |
6828a471 JM |
597 | } |
598 | ||
c36cf071 JM |
599 | for_each_cpu(cpu, &cpufreq_device->allowed_cpus) { |
600 | u32 load; | |
601 | ||
602 | if (cpu_online(cpu)) | |
a53b8394 | 603 | load = get_load(cpufreq_device, cpu, i); |
c36cf071 JM |
604 | else |
605 | load = 0; | |
606 | ||
607 | total_load += load; | |
6828a471 JM |
608 | if (trace_thermal_power_cpu_limit_enabled() && load_cpu) |
609 | load_cpu[i] = load; | |
610 | ||
611 | i++; | |
c36cf071 JM |
612 | } |
613 | ||
614 | cpufreq_device->last_load = total_load; | |
615 | ||
616 | dynamic_power = get_dynamic_power(cpufreq_device, freq); | |
617 | ret = get_static_power(cpufreq_device, tz, freq, &static_power); | |
6828a471 | 618 | if (ret) { |
a71544cd | 619 | kfree(load_cpu); |
c36cf071 | 620 | return ret; |
6828a471 JM |
621 | } |
622 | ||
623 | if (load_cpu) { | |
624 | trace_thermal_power_cpu_get_power( | |
625 | &cpufreq_device->allowed_cpus, | |
626 | freq, load_cpu, i, dynamic_power, static_power); | |
627 | ||
a71544cd | 628 | kfree(load_cpu); |
6828a471 | 629 | } |
c36cf071 JM |
630 | |
631 | *power = static_power + dynamic_power; | |
632 | return 0; | |
633 | } | |
634 | ||
635 | /** | |
636 | * cpufreq_state2power() - convert a cpu cdev state to power consumed | |
637 | * @cdev: &thermal_cooling_device pointer | |
638 | * @tz: a valid thermal zone device pointer | |
639 | * @state: cooling device state to be converted | |
640 | * @power: pointer in which to store the resulting power | |
641 | * | |
642 | * Convert cooling device state @state into power consumption in | |
643 | * milliwatts assuming 100% load. Store the calculated power in | |
644 | * @power. | |
645 | * | |
646 | * Return: 0 on success, -EINVAL if the cooling device state could not | |
647 | * be converted into a frequency or other -E* if there was an error | |
648 | * when calculating the static power. | |
649 | */ | |
650 | static int cpufreq_state2power(struct thermal_cooling_device *cdev, | |
651 | struct thermal_zone_device *tz, | |
652 | unsigned long state, u32 *power) | |
653 | { | |
654 | unsigned int freq, num_cpus; | |
655 | cpumask_t cpumask; | |
656 | u32 static_power, dynamic_power; | |
657 | int ret; | |
658 | struct cpufreq_cooling_device *cpufreq_device = cdev->devdata; | |
659 | ||
660 | cpumask_and(&cpumask, &cpufreq_device->allowed_cpus, cpu_online_mask); | |
661 | num_cpus = cpumask_weight(&cpumask); | |
662 | ||
663 | /* None of our cpus are online, so no power */ | |
664 | if (num_cpus == 0) { | |
665 | *power = 0; | |
666 | return 0; | |
667 | } | |
668 | ||
669 | freq = cpufreq_device->freq_table[state]; | |
670 | if (!freq) | |
671 | return -EINVAL; | |
672 | ||
673 | dynamic_power = cpu_freq_to_power(cpufreq_device, freq) * num_cpus; | |
674 | ret = get_static_power(cpufreq_device, tz, freq, &static_power); | |
675 | if (ret) | |
676 | return ret; | |
677 | ||
678 | *power = static_power + dynamic_power; | |
679 | return 0; | |
680 | } | |
681 | ||
682 | /** | |
683 | * cpufreq_power2state() - convert power to a cooling device state | |
684 | * @cdev: &thermal_cooling_device pointer | |
685 | * @tz: a valid thermal zone device pointer | |
686 | * @power: power in milliwatts to be converted | |
687 | * @state: pointer in which to store the resulting state | |
688 | * | |
689 | * Calculate a cooling device state for the cpus described by @cdev | |
690 | * that would allow them to consume at most @power mW and store it in | |
691 | * @state. Note that this calculation depends on external factors | |
692 | * such as the cpu load or the current static power. Calling this | |
693 | * function with the same power as input can yield different cooling | |
694 | * device states depending on those external factors. | |
695 | * | |
696 | * Return: 0 on success, -ENODEV if no cpus are online or -EINVAL if | |
697 | * the calculated frequency could not be converted to a valid state. | |
698 | * The latter should not happen unless the frequencies available to | |
699 | * cpufreq have changed since the initialization of the cpu cooling | |
700 | * device. | |
701 | */ | |
702 | static int cpufreq_power2state(struct thermal_cooling_device *cdev, | |
703 | struct thermal_zone_device *tz, u32 power, | |
704 | unsigned long *state) | |
705 | { | |
706 | unsigned int cpu, cur_freq, target_freq; | |
707 | int ret; | |
708 | s32 dyn_power; | |
709 | u32 last_load, normalised_power, static_power; | |
710 | struct cpufreq_cooling_device *cpufreq_device = cdev->devdata; | |
711 | ||
712 | cpu = cpumask_any_and(&cpufreq_device->allowed_cpus, cpu_online_mask); | |
713 | ||
714 | /* None of our cpus are online */ | |
715 | if (cpu >= nr_cpu_ids) | |
716 | return -ENODEV; | |
717 | ||
718 | cur_freq = cpufreq_quick_get(cpu); | |
719 | ret = get_static_power(cpufreq_device, tz, cur_freq, &static_power); | |
720 | if (ret) | |
721 | return ret; | |
722 | ||
723 | dyn_power = power - static_power; | |
724 | dyn_power = dyn_power > 0 ? dyn_power : 0; | |
725 | last_load = cpufreq_device->last_load ?: 1; | |
726 | normalised_power = (dyn_power * 100) / last_load; | |
727 | target_freq = cpu_power_to_freq(cpufreq_device, normalised_power); | |
728 | ||
729 | *state = cpufreq_cooling_get_level(cpu, target_freq); | |
730 | if (*state == THERMAL_CSTATE_INVALID) { | |
731 | dev_warn_ratelimited(&cdev->device, | |
732 | "Failed to convert %dKHz for cpu %d into a cdev state\n", | |
733 | target_freq, cpu); | |
734 | return -EINVAL; | |
735 | } | |
736 | ||
6828a471 JM |
737 | trace_thermal_power_cpu_limit(&cpufreq_device->allowed_cpus, |
738 | target_freq, *state, power); | |
c36cf071 JM |
739 | return 0; |
740 | } | |
741 | ||
02361418 | 742 | /* Bind cpufreq callbacks to thermal cooling device ops */ |
c36cf071 | 743 | static struct thermal_cooling_device_ops cpufreq_cooling_ops = { |
02361418 ADK |
744 | .get_max_state = cpufreq_get_max_state, |
745 | .get_cur_state = cpufreq_get_cur_state, | |
746 | .set_cur_state = cpufreq_set_cur_state, | |
747 | }; | |
748 | ||
749 | /* Notifier for cpufreq policy change */ | |
750 | static struct notifier_block thermal_cpufreq_notifier_block = { | |
751 | .notifier_call = cpufreq_thermal_notifier, | |
752 | }; | |
753 | ||
f6859014 VK |
754 | static unsigned int find_next_max(struct cpufreq_frequency_table *table, |
755 | unsigned int prev_max) | |
756 | { | |
757 | struct cpufreq_frequency_table *pos; | |
758 | unsigned int max = 0; | |
759 | ||
760 | cpufreq_for_each_valid_entry(pos, table) { | |
761 | if (pos->frequency > max && pos->frequency < prev_max) | |
762 | max = pos->frequency; | |
763 | } | |
764 | ||
765 | return max; | |
766 | } | |
767 | ||
02361418 | 768 | /** |
39d99cff EV |
769 | * __cpufreq_cooling_register - helper function to create cpufreq cooling device |
770 | * @np: a valid struct device_node to the cooling device device tree node | |
02361418 | 771 | * @clip_cpus: cpumask of cpus where the frequency constraints will happen. |
405fb825 | 772 | * Normally this should be same as cpufreq policy->related_cpus. |
c36cf071 JM |
773 | * @capacitance: dynamic power coefficient for these cpus |
774 | * @plat_static_func: function to calculate the static power consumed by these | |
775 | * cpus (optional) | |
12cb08ba EV |
776 | * |
777 | * This interface function registers the cpufreq cooling device with the name | |
778 | * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq | |
39d99cff EV |
779 | * cooling devices. It also gives the opportunity to link the cooling device |
780 | * with a device tree node, in order to bind it via the thermal DT code. | |
12cb08ba EV |
781 | * |
782 | * Return: a valid struct thermal_cooling_device pointer on success, | |
783 | * on failure, it returns a corresponding ERR_PTR(). | |
02361418 | 784 | */ |
39d99cff EV |
785 | static struct thermal_cooling_device * |
786 | __cpufreq_cooling_register(struct device_node *np, | |
c36cf071 JM |
787 | const struct cpumask *clip_cpus, u32 capacitance, |
788 | get_static_t plat_static_func) | |
02361418 ADK |
789 | { |
790 | struct thermal_cooling_device *cool_dev; | |
5d3bdb89 | 791 | struct cpufreq_cooling_device *cpufreq_dev; |
02361418 | 792 | char dev_name[THERMAL_NAME_LENGTH]; |
dcc6c7fd | 793 | struct cpufreq_frequency_table *pos, *table; |
c36cf071 | 794 | unsigned int freq, i, num_cpus; |
405fb825 | 795 | int ret; |
02361418 | 796 | |
dcc6c7fd VK |
797 | table = cpufreq_frequency_get_table(cpumask_first(clip_cpus)); |
798 | if (!table) { | |
0f1be51c EV |
799 | pr_debug("%s: CPUFreq table not found\n", __func__); |
800 | return ERR_PTR(-EPROBE_DEFER); | |
02361418 | 801 | } |
0f1be51c | 802 | |
98d522f0 | 803 | cpufreq_dev = kzalloc(sizeof(*cpufreq_dev), GFP_KERNEL); |
02361418 ADK |
804 | if (!cpufreq_dev) |
805 | return ERR_PTR(-ENOMEM); | |
806 | ||
c36cf071 JM |
807 | num_cpus = cpumask_weight(clip_cpus); |
808 | cpufreq_dev->time_in_idle = kcalloc(num_cpus, | |
809 | sizeof(*cpufreq_dev->time_in_idle), | |
810 | GFP_KERNEL); | |
811 | if (!cpufreq_dev->time_in_idle) { | |
812 | cool_dev = ERR_PTR(-ENOMEM); | |
813 | goto free_cdev; | |
814 | } | |
815 | ||
816 | cpufreq_dev->time_in_idle_timestamp = | |
817 | kcalloc(num_cpus, sizeof(*cpufreq_dev->time_in_idle_timestamp), | |
818 | GFP_KERNEL); | |
819 | if (!cpufreq_dev->time_in_idle_timestamp) { | |
820 | cool_dev = ERR_PTR(-ENOMEM); | |
821 | goto free_time_in_idle; | |
822 | } | |
823 | ||
dcc6c7fd VK |
824 | /* Find max levels */ |
825 | cpufreq_for_each_valid_entry(pos, table) | |
826 | cpufreq_dev->max_level++; | |
827 | ||
f6859014 VK |
828 | cpufreq_dev->freq_table = kmalloc(sizeof(*cpufreq_dev->freq_table) * |
829 | cpufreq_dev->max_level, GFP_KERNEL); | |
830 | if (!cpufreq_dev->freq_table) { | |
f6859014 | 831 | cool_dev = ERR_PTR(-ENOMEM); |
c36cf071 | 832 | goto free_time_in_idle_timestamp; |
f6859014 VK |
833 | } |
834 | ||
dcc6c7fd VK |
835 | /* max_level is an index, not a counter */ |
836 | cpufreq_dev->max_level--; | |
837 | ||
02361418 ADK |
838 | cpumask_copy(&cpufreq_dev->allowed_cpus, clip_cpus); |
839 | ||
c36cf071 JM |
840 | if (capacitance) { |
841 | cpufreq_cooling_ops.get_requested_power = | |
842 | cpufreq_get_requested_power; | |
843 | cpufreq_cooling_ops.state2power = cpufreq_state2power; | |
844 | cpufreq_cooling_ops.power2state = cpufreq_power2state; | |
845 | cpufreq_dev->plat_get_static_power = plat_static_func; | |
846 | ||
847 | ret = build_dyn_power_table(cpufreq_dev, capacitance); | |
848 | if (ret) { | |
849 | cool_dev = ERR_PTR(ret); | |
850 | goto free_table; | |
851 | } | |
852 | } | |
853 | ||
02361418 ADK |
854 | ret = get_idr(&cpufreq_idr, &cpufreq_dev->id); |
855 | if (ret) { | |
730abe06 | 856 | cool_dev = ERR_PTR(ret); |
eba4f88d | 857 | goto free_power_table; |
02361418 ADK |
858 | } |
859 | ||
f6859014 VK |
860 | /* Fill freq-table in descending order of frequencies */ |
861 | for (i = 0, freq = -1; i <= cpufreq_dev->max_level; i++) { | |
862 | freq = find_next_max(table, freq); | |
863 | cpufreq_dev->freq_table[i] = freq; | |
864 | ||
865 | /* Warn for duplicate entries */ | |
866 | if (!freq) | |
867 | pr_warn("%s: table has duplicate entries\n", __func__); | |
868 | else | |
869 | pr_debug("%s: freq:%u KHz\n", __func__, freq); | |
02361418 | 870 | } |
f6859014 | 871 | |
f840ab18 LL |
872 | snprintf(dev_name, sizeof(dev_name), "thermal-cpufreq-%d", |
873 | cpufreq_dev->id); | |
874 | ||
875 | cool_dev = thermal_of_cooling_device_register(np, dev_name, cpufreq_dev, | |
876 | &cpufreq_cooling_ops); | |
877 | if (IS_ERR(cool_dev)) | |
878 | goto remove_idr; | |
879 | ||
59f0d218 | 880 | cpufreq_dev->clipped_freq = cpufreq_dev->freq_table[0]; |
02361418 | 881 | cpufreq_dev->cool_dev = cool_dev; |
92e615ec | 882 | |
02361418 | 883 | mutex_lock(&cooling_cpufreq_lock); |
02361418 | 884 | |
02373d7c RK |
885 | mutex_lock(&cooling_list_lock); |
886 | list_add(&cpufreq_dev->node, &cpufreq_dev_list); | |
887 | mutex_unlock(&cooling_list_lock); | |
888 | ||
02361418 | 889 | /* Register the notifier for first cpufreq cooling device */ |
02373d7c | 890 | if (!cpufreq_dev_count++) |
02361418 | 891 | cpufreq_register_notifier(&thermal_cpufreq_notifier_block, |
5fda7f68 | 892 | CPUFREQ_POLICY_NOTIFIER); |
02361418 | 893 | mutex_unlock(&cooling_cpufreq_lock); |
79491e53 | 894 | |
730abe06 VK |
895 | return cool_dev; |
896 | ||
897 | remove_idr: | |
898 | release_idr(&cpufreq_idr, cpufreq_dev->id); | |
eba4f88d JM |
899 | free_power_table: |
900 | kfree(cpufreq_dev->dyn_power_table); | |
f6859014 VK |
901 | free_table: |
902 | kfree(cpufreq_dev->freq_table); | |
c36cf071 JM |
903 | free_time_in_idle_timestamp: |
904 | kfree(cpufreq_dev->time_in_idle_timestamp); | |
905 | free_time_in_idle: | |
906 | kfree(cpufreq_dev->time_in_idle); | |
730abe06 VK |
907 | free_cdev: |
908 | kfree(cpufreq_dev); | |
909 | ||
02361418 ADK |
910 | return cool_dev; |
911 | } | |
39d99cff EV |
912 | |
913 | /** | |
914 | * cpufreq_cooling_register - function to create cpufreq cooling device. | |
915 | * @clip_cpus: cpumask of cpus where the frequency constraints will happen. | |
916 | * | |
917 | * This interface function registers the cpufreq cooling device with the name | |
918 | * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq | |
919 | * cooling devices. | |
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 | cpufreq_cooling_register(const struct cpumask *clip_cpus) | |
926 | { | |
c36cf071 | 927 | return __cpufreq_cooling_register(NULL, clip_cpus, 0, NULL); |
39d99cff | 928 | } |
243dbd9c | 929 | EXPORT_SYMBOL_GPL(cpufreq_cooling_register); |
02361418 | 930 | |
39d99cff EV |
931 | /** |
932 | * of_cpufreq_cooling_register - function to create cpufreq cooling device. | |
933 | * @np: a valid struct device_node to the cooling device device tree node | |
934 | * @clip_cpus: cpumask of cpus where the frequency constraints will happen. | |
935 | * | |
936 | * This interface function registers the cpufreq cooling device with the name | |
937 | * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq | |
938 | * cooling devices. Using this API, the cpufreq cooling device will be | |
939 | * linked to the device tree node provided. | |
940 | * | |
941 | * Return: a valid struct thermal_cooling_device pointer on success, | |
942 | * on failure, it returns a corresponding ERR_PTR(). | |
943 | */ | |
944 | struct thermal_cooling_device * | |
945 | of_cpufreq_cooling_register(struct device_node *np, | |
946 | const struct cpumask *clip_cpus) | |
947 | { | |
948 | if (!np) | |
949 | return ERR_PTR(-EINVAL); | |
950 | ||
c36cf071 | 951 | return __cpufreq_cooling_register(np, clip_cpus, 0, NULL); |
39d99cff EV |
952 | } |
953 | EXPORT_SYMBOL_GPL(of_cpufreq_cooling_register); | |
954 | ||
c36cf071 JM |
955 | /** |
956 | * cpufreq_power_cooling_register() - create cpufreq cooling device with power extensions | |
957 | * @clip_cpus: cpumask of cpus where the frequency constraints will happen | |
958 | * @capacitance: dynamic power coefficient for these cpus | |
959 | * @plat_static_func: function to calculate the static power consumed by these | |
960 | * cpus (optional) | |
961 | * | |
962 | * This interface function registers the cpufreq cooling device with | |
963 | * the name "thermal-cpufreq-%x". This api can support multiple | |
964 | * instances of cpufreq cooling devices. Using this function, the | |
965 | * cooling device will implement the power extensions by using a | |
966 | * simple cpu power model. The cpus must have registered their OPPs | |
967 | * using the OPP library. | |
968 | * | |
969 | * An optional @plat_static_func may be provided to calculate the | |
970 | * static power consumed by these cpus. If the platform's static | |
971 | * power consumption is unknown or negligible, make it NULL. | |
972 | * | |
973 | * Return: a valid struct thermal_cooling_device pointer on success, | |
974 | * on failure, it returns a corresponding ERR_PTR(). | |
975 | */ | |
976 | struct thermal_cooling_device * | |
977 | cpufreq_power_cooling_register(const struct cpumask *clip_cpus, u32 capacitance, | |
978 | get_static_t plat_static_func) | |
979 | { | |
980 | return __cpufreq_cooling_register(NULL, clip_cpus, capacitance, | |
981 | plat_static_func); | |
982 | } | |
983 | EXPORT_SYMBOL(cpufreq_power_cooling_register); | |
984 | ||
985 | /** | |
986 | * of_cpufreq_power_cooling_register() - create cpufreq cooling device with power extensions | |
987 | * @np: a valid struct device_node to the cooling device device tree node | |
988 | * @clip_cpus: cpumask of cpus where the frequency constraints will happen | |
989 | * @capacitance: dynamic power coefficient for these cpus | |
990 | * @plat_static_func: function to calculate the static power consumed by these | |
991 | * cpus (optional) | |
992 | * | |
993 | * This interface function registers the cpufreq cooling device with | |
994 | * the name "thermal-cpufreq-%x". This api can support multiple | |
995 | * instances of cpufreq cooling devices. Using this API, the cpufreq | |
996 | * cooling device will be linked to the device tree node provided. | |
997 | * Using this function, the cooling device will implement the power | |
998 | * extensions by using a simple cpu power model. The cpus must have | |
999 | * registered their OPPs using the OPP library. | |
1000 | * | |
1001 | * An optional @plat_static_func may be provided to calculate the | |
1002 | * static power consumed by these cpus. If the platform's static | |
1003 | * power consumption is unknown or negligible, make it NULL. | |
1004 | * | |
1005 | * Return: a valid struct thermal_cooling_device pointer on success, | |
1006 | * on failure, it returns a corresponding ERR_PTR(). | |
1007 | */ | |
1008 | struct thermal_cooling_device * | |
1009 | of_cpufreq_power_cooling_register(struct device_node *np, | |
1010 | const struct cpumask *clip_cpus, | |
1011 | u32 capacitance, | |
1012 | get_static_t plat_static_func) | |
1013 | { | |
1014 | if (!np) | |
1015 | return ERR_PTR(-EINVAL); | |
1016 | ||
1017 | return __cpufreq_cooling_register(np, clip_cpus, capacitance, | |
1018 | plat_static_func); | |
1019 | } | |
1020 | EXPORT_SYMBOL(of_cpufreq_power_cooling_register); | |
1021 | ||
02361418 ADK |
1022 | /** |
1023 | * cpufreq_cooling_unregister - function to remove cpufreq cooling device. | |
1024 | * @cdev: thermal cooling device pointer. | |
135266b4 EV |
1025 | * |
1026 | * This interface function unregisters the "thermal-cpufreq-%x" cooling device. | |
02361418 ADK |
1027 | */ |
1028 | void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev) | |
1029 | { | |
50e66c7e | 1030 | struct cpufreq_cooling_device *cpufreq_dev; |
02361418 | 1031 | |
50e66c7e EV |
1032 | if (!cdev) |
1033 | return; | |
1034 | ||
1035 | cpufreq_dev = cdev->devdata; | |
02361418 ADK |
1036 | |
1037 | /* Unregister the notifier for the last cpufreq cooling device */ | |
02373d7c RK |
1038 | mutex_lock(&cooling_cpufreq_lock); |
1039 | if (!--cpufreq_dev_count) | |
02361418 | 1040 | cpufreq_unregister_notifier(&thermal_cpufreq_notifier_block, |
5fda7f68 | 1041 | CPUFREQ_POLICY_NOTIFIER); |
02373d7c RK |
1042 | |
1043 | mutex_lock(&cooling_list_lock); | |
1044 | list_del(&cpufreq_dev->node); | |
1045 | mutex_unlock(&cooling_list_lock); | |
1046 | ||
02361418 | 1047 | mutex_unlock(&cooling_cpufreq_lock); |
160b7d80 | 1048 | |
02361418 ADK |
1049 | thermal_cooling_device_unregister(cpufreq_dev->cool_dev); |
1050 | release_idr(&cpufreq_idr, cpufreq_dev->id); | |
eba4f88d | 1051 | kfree(cpufreq_dev->dyn_power_table); |
c36cf071 JM |
1052 | kfree(cpufreq_dev->time_in_idle_timestamp); |
1053 | kfree(cpufreq_dev->time_in_idle); | |
f6859014 | 1054 | kfree(cpufreq_dev->freq_table); |
02361418 ADK |
1055 | kfree(cpufreq_dev); |
1056 | } | |
243dbd9c | 1057 | EXPORT_SYMBOL_GPL(cpufreq_cooling_unregister); |