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0fac9e2f | 1 | // SPDX-License-Identifier: GPL-2.0 |
02361418 | 2 | /* |
23affa2e | 3 | * linux/drivers/thermal/cpufreq_cooling.c |
02361418 ADK |
4 | * |
5 | * Copyright (C) 2012 Samsung Electronics Co., Ltd(http://www.samsung.com) | |
02361418 | 6 | * |
42cd9b04 DL |
7 | * Copyright (C) 2012-2018 Linaro Limited. |
8 | * | |
9 | * Authors: Amit Daniel <amit.kachhap@linaro.org> | |
10 | * Viresh Kumar <viresh.kumar@linaro.org> | |
73904cbc | 11 | * |
02361418 | 12 | */ |
5ccb451e | 13 | #include <linux/cpu.h> |
02361418 | 14 | #include <linux/cpufreq.h> |
5ccb451e AK |
15 | #include <linux/cpu_cooling.h> |
16 | #include <linux/energy_model.h> | |
02361418 | 17 | #include <linux/err.h> |
c65f83c0 | 18 | #include <linux/export.h> |
ae606089 | 19 | #include <linux/idr.h> |
c36cf071 | 20 | #include <linux/pm_opp.h> |
5130802d | 21 | #include <linux/pm_qos.h> |
02361418 | 22 | #include <linux/slab.h> |
5ccb451e | 23 | #include <linux/thermal.h> |
02361418 | 24 | |
6828a471 JM |
25 | #include <trace/events/thermal.h> |
26 | ||
07d888d8 VK |
27 | /* |
28 | * Cooling state <-> CPUFreq frequency | |
29 | * | |
30 | * Cooling states are translated to frequencies throughout this driver and this | |
31 | * is the relation between them. | |
32 | * | |
33 | * Highest cooling state corresponds to lowest possible frequency. | |
34 | * | |
35 | * i.e. | |
36 | * level 0 --> 1st Max Freq | |
37 | * level 1 --> 2nd Max Freq | |
38 | * ... | |
39 | */ | |
40 | ||
81ee14da VK |
41 | /** |
42 | * struct time_in_idle - Idle time stats | |
43 | * @time: previous reading of the absolute time that this cpu was idle | |
44 | * @timestamp: wall time of the last invocation of get_cpu_idle_time_us() | |
45 | */ | |
46 | struct time_in_idle { | |
47 | u64 time; | |
48 | u64 timestamp; | |
49 | }; | |
50 | ||
02361418 | 51 | /** |
3b3c0748 | 52 | * struct cpufreq_cooling_device - data for cooling device with cpufreq |
02361418 ADK |
53 | * @id: unique integer value corresponding to each cpufreq_cooling_device |
54 | * registered. | |
d72b4015 | 55 | * @last_load: load measured by the latest call to cpufreq_get_requested_power() |
02361418 ADK |
56 | * @cpufreq_state: integer value representing the current state of cpufreq |
57 | * cooling devices. | |
dcc6c7fd VK |
58 | * @max_level: maximum cooling level. One less than total number of valid |
59 | * cpufreq frequencies. | |
a4e893e8 | 60 | * @em: Reference on the Energy Model of the device |
d72b4015 VK |
61 | * @cdev: thermal_cooling_device pointer to keep track of the |
62 | * registered cooling device. | |
63 | * @policy: cpufreq policy. | |
fc4de356 | 64 | * @node: list_head to link all cpufreq_cooling_device together. |
81ee14da | 65 | * @idle_time: idle time stats |
7b4e7f07 | 66 | * @qos_req: PM QoS contraint to apply |
02361418 | 67 | * |
beca6053 VK |
68 | * This structure is required for keeping information of each registered |
69 | * cpufreq_cooling_device. | |
02361418 ADK |
70 | */ |
71 | struct cpufreq_cooling_device { | |
72 | int id; | |
d72b4015 | 73 | u32 last_load; |
02361418 | 74 | unsigned int cpufreq_state; |
dcc6c7fd | 75 | unsigned int max_level; |
a4e893e8 | 76 | struct em_perf_domain *em; |
d72b4015 | 77 | struct cpufreq_policy *policy; |
2dcd851f | 78 | struct list_head node; |
81ee14da | 79 | struct time_in_idle *idle_time; |
3000ce3c | 80 | struct freq_qos_request qos_req; |
02361418 | 81 | }; |
02361418 | 82 | |
fb8ea308 | 83 | static DEFINE_IDA(cpufreq_ida); |
02373d7c | 84 | static DEFINE_MUTEX(cooling_list_lock); |
1dea432a | 85 | static LIST_HEAD(cpufreq_cdev_list); |
02361418 | 86 | |
5a4e5b78 | 87 | #ifdef CONFIG_THERMAL_GOV_POWER_ALLOCATOR |
02361418 | 88 | /** |
4843c4a1 | 89 | * get_level: Find the level for a particular frequency |
1dea432a | 90 | * @cpufreq_cdev: cpufreq_cdev for which the property is required |
4843c4a1 | 91 | * @freq: Frequency |
82b9ee40 | 92 | * |
da27f69d | 93 | * Return: level corresponding to the frequency. |
02361418 | 94 | */ |
1dea432a | 95 | static unsigned long get_level(struct cpufreq_cooling_device *cpufreq_cdev, |
4843c4a1 | 96 | unsigned int freq) |
02361418 | 97 | { |
a4e893e8 | 98 | int i; |
a116776f | 99 | |
a4e893e8 QP |
100 | for (i = cpufreq_cdev->max_level - 1; i >= 0; i--) { |
101 | if (freq > cpufreq_cdev->em->table[i].frequency) | |
4843c4a1 | 102 | break; |
c36cf071 | 103 | } |
02361418 | 104 | |
a4e893e8 | 105 | return cpufreq_cdev->max_level - i - 1; |
c36cf071 JM |
106 | } |
107 | ||
1dea432a | 108 | static u32 cpu_freq_to_power(struct cpufreq_cooling_device *cpufreq_cdev, |
c36cf071 JM |
109 | u32 freq) |
110 | { | |
111 | int i; | |
c36cf071 | 112 | |
a4e893e8 QP |
113 | for (i = cpufreq_cdev->max_level - 1; i >= 0; i--) { |
114 | if (freq > cpufreq_cdev->em->table[i].frequency) | |
c36cf071 | 115 | break; |
a4e893e8 | 116 | } |
c36cf071 | 117 | |
a4e893e8 | 118 | return cpufreq_cdev->em->table[i + 1].power; |
c36cf071 JM |
119 | } |
120 | ||
1dea432a | 121 | static u32 cpu_power_to_freq(struct cpufreq_cooling_device *cpufreq_cdev, |
c36cf071 JM |
122 | u32 power) |
123 | { | |
124 | int i; | |
c36cf071 | 125 | |
371a3bc7 FX |
126 | for (i = cpufreq_cdev->max_level; i >= 0; i--) { |
127 | if (power >= cpufreq_cdev->em->table[i].power) | |
c36cf071 | 128 | break; |
a4e893e8 | 129 | } |
c36cf071 | 130 | |
371a3bc7 | 131 | return cpufreq_cdev->em->table[i].frequency; |
c36cf071 JM |
132 | } |
133 | ||
134 | /** | |
135 | * get_load() - get load for a cpu since last updated | |
1dea432a | 136 | * @cpufreq_cdev: &struct cpufreq_cooling_device for this cpu |
c36cf071 | 137 | * @cpu: cpu number |
ba76dd9d | 138 | * @cpu_idx: index of the cpu in time_in_idle* |
c36cf071 JM |
139 | * |
140 | * Return: The average load of cpu @cpu in percentage since this | |
141 | * function was last called. | |
142 | */ | |
1dea432a | 143 | static u32 get_load(struct cpufreq_cooling_device *cpufreq_cdev, int cpu, |
a53b8394 | 144 | int cpu_idx) |
c36cf071 JM |
145 | { |
146 | u32 load; | |
147 | u64 now, now_idle, delta_time, delta_idle; | |
81ee14da | 148 | struct time_in_idle *idle_time = &cpufreq_cdev->idle_time[cpu_idx]; |
c36cf071 JM |
149 | |
150 | now_idle = get_cpu_idle_time(cpu, &now, 0); | |
81ee14da VK |
151 | delta_idle = now_idle - idle_time->time; |
152 | delta_time = now - idle_time->timestamp; | |
c36cf071 JM |
153 | |
154 | if (delta_time <= delta_idle) | |
155 | load = 0; | |
156 | else | |
157 | load = div64_u64(100 * (delta_time - delta_idle), delta_time); | |
158 | ||
81ee14da VK |
159 | idle_time->time = now_idle; |
160 | idle_time->timestamp = now; | |
c36cf071 JM |
161 | |
162 | return load; | |
163 | } | |
164 | ||
c36cf071 JM |
165 | /** |
166 | * get_dynamic_power() - calculate the dynamic power | |
1dea432a | 167 | * @cpufreq_cdev: &cpufreq_cooling_device for this cdev |
c36cf071 JM |
168 | * @freq: current frequency |
169 | * | |
170 | * Return: the dynamic power consumed by the cpus described by | |
1dea432a | 171 | * @cpufreq_cdev. |
c36cf071 | 172 | */ |
1dea432a | 173 | static u32 get_dynamic_power(struct cpufreq_cooling_device *cpufreq_cdev, |
c36cf071 JM |
174 | unsigned long freq) |
175 | { | |
176 | u32 raw_cpu_power; | |
177 | ||
1dea432a VK |
178 | raw_cpu_power = cpu_freq_to_power(cpufreq_cdev, freq); |
179 | return (raw_cpu_power * cpufreq_cdev->last_load) / 100; | |
02361418 ADK |
180 | } |
181 | ||
c36cf071 JM |
182 | /** |
183 | * cpufreq_get_requested_power() - get the current power | |
184 | * @cdev: &thermal_cooling_device pointer | |
185 | * @tz: a valid thermal zone device pointer | |
186 | * @power: pointer in which to store the resulting power | |
187 | * | |
188 | * Calculate the current power consumption of the cpus in milliwatts | |
189 | * and store it in @power. This function should actually calculate | |
190 | * the requested power, but it's hard to get the frequency that | |
191 | * cpufreq would have assigned if there were no thermal limits. | |
192 | * Instead, we calculate the current power on the assumption that the | |
193 | * immediate future will look like the immediate past. | |
194 | * | |
195 | * We use the current frequency and the average load since this | |
196 | * function was last called. In reality, there could have been | |
197 | * multiple opps since this function was last called and that affects | |
198 | * the load calculation. While it's not perfectly accurate, this | |
199 | * simplification is good enough and works. REVISIT this, as more | |
200 | * complex code may be needed if experiments show that it's not | |
201 | * accurate enough. | |
202 | * | |
203 | * Return: 0 on success, -E* if getting the static power failed. | |
204 | */ | |
205 | static int cpufreq_get_requested_power(struct thermal_cooling_device *cdev, | |
206 | struct thermal_zone_device *tz, | |
207 | u32 *power) | |
208 | { | |
209 | unsigned long freq; | |
84fe2cab VK |
210 | int i = 0, cpu; |
211 | u32 total_load = 0; | |
1dea432a | 212 | struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata; |
ba76dd9d | 213 | struct cpufreq_policy *policy = cpufreq_cdev->policy; |
6828a471 | 214 | u32 *load_cpu = NULL; |
c36cf071 | 215 | |
ba76dd9d | 216 | freq = cpufreq_quick_get(policy->cpu); |
c36cf071 | 217 | |
6828a471 | 218 | if (trace_thermal_power_cpu_get_power_enabled()) { |
ba76dd9d | 219 | u32 ncpus = cpumask_weight(policy->related_cpus); |
6828a471 | 220 | |
a71544cd | 221 | load_cpu = kcalloc(ncpus, sizeof(*load_cpu), GFP_KERNEL); |
6828a471 JM |
222 | } |
223 | ||
ba76dd9d | 224 | for_each_cpu(cpu, policy->related_cpus) { |
c36cf071 JM |
225 | u32 load; |
226 | ||
227 | if (cpu_online(cpu)) | |
1dea432a | 228 | load = get_load(cpufreq_cdev, cpu, i); |
c36cf071 JM |
229 | else |
230 | load = 0; | |
231 | ||
232 | total_load += load; | |
bf45ac18 | 233 | if (load_cpu) |
6828a471 JM |
234 | load_cpu[i] = load; |
235 | ||
236 | i++; | |
c36cf071 JM |
237 | } |
238 | ||
1dea432a | 239 | cpufreq_cdev->last_load = total_load; |
c36cf071 | 240 | |
84fe2cab | 241 | *power = get_dynamic_power(cpufreq_cdev, freq); |
6828a471 JM |
242 | |
243 | if (load_cpu) { | |
ba76dd9d | 244 | trace_thermal_power_cpu_get_power(policy->related_cpus, freq, |
84fe2cab | 245 | load_cpu, i, *power); |
6828a471 | 246 | |
a71544cd | 247 | kfree(load_cpu); |
6828a471 | 248 | } |
c36cf071 | 249 | |
c36cf071 JM |
250 | return 0; |
251 | } | |
252 | ||
253 | /** | |
254 | * cpufreq_state2power() - convert a cpu cdev state to power consumed | |
255 | * @cdev: &thermal_cooling_device pointer | |
256 | * @tz: a valid thermal zone device pointer | |
257 | * @state: cooling device state to be converted | |
258 | * @power: pointer in which to store the resulting power | |
259 | * | |
260 | * Convert cooling device state @state into power consumption in | |
261 | * milliwatts assuming 100% load. Store the calculated power in | |
262 | * @power. | |
263 | * | |
264 | * Return: 0 on success, -EINVAL if the cooling device state could not | |
265 | * be converted into a frequency or other -E* if there was an error | |
266 | * when calculating the static power. | |
267 | */ | |
268 | static int cpufreq_state2power(struct thermal_cooling_device *cdev, | |
269 | struct thermal_zone_device *tz, | |
270 | unsigned long state, u32 *power) | |
271 | { | |
a4e893e8 | 272 | unsigned int freq, num_cpus, idx; |
1dea432a | 273 | struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata; |
c36cf071 | 274 | |
cb1b6318 | 275 | /* Request state should be less than max_level */ |
40ea5685 | 276 | if (state > cpufreq_cdev->max_level) |
cb1b6318 VK |
277 | return -EINVAL; |
278 | ||
ba76dd9d | 279 | num_cpus = cpumask_weight(cpufreq_cdev->policy->cpus); |
c36cf071 | 280 | |
a4e893e8 QP |
281 | idx = cpufreq_cdev->max_level - state; |
282 | freq = cpufreq_cdev->em->table[idx].frequency; | |
84fe2cab | 283 | *power = cpu_freq_to_power(cpufreq_cdev, freq) * num_cpus; |
c36cf071 | 284 | |
84fe2cab | 285 | return 0; |
c36cf071 JM |
286 | } |
287 | ||
288 | /** | |
289 | * cpufreq_power2state() - convert power to a cooling device state | |
290 | * @cdev: &thermal_cooling_device pointer | |
291 | * @tz: a valid thermal zone device pointer | |
292 | * @power: power in milliwatts to be converted | |
293 | * @state: pointer in which to store the resulting state | |
294 | * | |
295 | * Calculate a cooling device state for the cpus described by @cdev | |
296 | * that would allow them to consume at most @power mW and store it in | |
297 | * @state. Note that this calculation depends on external factors | |
298 | * such as the cpu load or the current static power. Calling this | |
299 | * function with the same power as input can yield different cooling | |
300 | * device states depending on those external factors. | |
301 | * | |
302 | * Return: 0 on success, -ENODEV if no cpus are online or -EINVAL if | |
303 | * the calculated frequency could not be converted to a valid state. | |
304 | * The latter should not happen unless the frequencies available to | |
305 | * cpufreq have changed since the initialization of the cpu cooling | |
306 | * device. | |
307 | */ | |
308 | static int cpufreq_power2state(struct thermal_cooling_device *cdev, | |
309 | struct thermal_zone_device *tz, u32 power, | |
310 | unsigned long *state) | |
311 | { | |
e0fda737 | 312 | unsigned int target_freq; |
84fe2cab | 313 | u32 last_load, normalised_power; |
1dea432a | 314 | struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata; |
ba76dd9d | 315 | struct cpufreq_policy *policy = cpufreq_cdev->policy; |
c36cf071 | 316 | |
1dea432a | 317 | last_load = cpufreq_cdev->last_load ?: 1; |
84fe2cab | 318 | normalised_power = (power * 100) / last_load; |
1dea432a | 319 | target_freq = cpu_power_to_freq(cpufreq_cdev, normalised_power); |
c36cf071 | 320 | |
3e08b2df | 321 | *state = get_level(cpufreq_cdev, target_freq); |
ba76dd9d VK |
322 | trace_thermal_power_cpu_limit(policy->related_cpus, target_freq, *state, |
323 | power); | |
c36cf071 JM |
324 | return 0; |
325 | } | |
a4e893e8 QP |
326 | |
327 | static inline bool em_is_sane(struct cpufreq_cooling_device *cpufreq_cdev, | |
328 | struct em_perf_domain *em) { | |
329 | struct cpufreq_policy *policy; | |
330 | unsigned int nr_levels; | |
331 | ||
332 | if (!em) | |
333 | return false; | |
334 | ||
335 | policy = cpufreq_cdev->policy; | |
521b512b | 336 | if (!cpumask_equal(policy->related_cpus, em_span_cpus(em))) { |
a4e893e8 | 337 | pr_err("The span of pd %*pbl is misaligned with cpufreq policy %*pbl\n", |
521b512b | 338 | cpumask_pr_args(em_span_cpus(em)), |
a4e893e8 QP |
339 | cpumask_pr_args(policy->related_cpus)); |
340 | return false; | |
341 | } | |
342 | ||
343 | nr_levels = cpufreq_cdev->max_level + 1; | |
521b512b LL |
344 | if (em_pd_nr_perf_states(em) != nr_levels) { |
345 | pr_err("The number of performance states in pd %*pbl (%u) doesn't match the number of cooling levels (%u)\n", | |
346 | cpumask_pr_args(em_span_cpus(em)), | |
347 | em_pd_nr_perf_states(em), nr_levels); | |
a4e893e8 QP |
348 | return false; |
349 | } | |
350 | ||
351 | return true; | |
352 | } | |
5a4e5b78 QP |
353 | #endif /* CONFIG_THERMAL_GOV_POWER_ALLOCATOR */ |
354 | ||
a4e893e8 QP |
355 | static unsigned int get_state_freq(struct cpufreq_cooling_device *cpufreq_cdev, |
356 | unsigned long state) | |
357 | { | |
358 | struct cpufreq_policy *policy; | |
359 | unsigned long idx; | |
360 | ||
361 | #ifdef CONFIG_THERMAL_GOV_POWER_ALLOCATOR | |
362 | /* Use the Energy Model table if available */ | |
363 | if (cpufreq_cdev->em) { | |
364 | idx = cpufreq_cdev->max_level - state; | |
365 | return cpufreq_cdev->em->table[idx].frequency; | |
366 | } | |
367 | #endif | |
368 | ||
369 | /* Otherwise, fallback on the CPUFreq table */ | |
370 | policy = cpufreq_cdev->policy; | |
371 | if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING) | |
372 | idx = cpufreq_cdev->max_level - state; | |
373 | else | |
374 | idx = state; | |
375 | ||
376 | return policy->freq_table[idx].frequency; | |
377 | } | |
378 | ||
5a4e5b78 QP |
379 | /* cpufreq cooling device callback functions are defined below */ |
380 | ||
381 | /** | |
382 | * cpufreq_get_max_state - callback function to get the max cooling state. | |
383 | * @cdev: thermal cooling device pointer. | |
384 | * @state: fill this variable with the max cooling state. | |
385 | * | |
386 | * Callback for the thermal cooling device to return the cpufreq | |
387 | * max cooling state. | |
388 | * | |
389 | * Return: 0 on success, an error code otherwise. | |
390 | */ | |
391 | static int cpufreq_get_max_state(struct thermal_cooling_device *cdev, | |
392 | unsigned long *state) | |
393 | { | |
394 | struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata; | |
395 | ||
396 | *state = cpufreq_cdev->max_level; | |
397 | return 0; | |
398 | } | |
399 | ||
400 | /** | |
401 | * cpufreq_get_cur_state - callback function to get the current cooling state. | |
402 | * @cdev: thermal cooling device pointer. | |
403 | * @state: fill this variable with the current cooling state. | |
404 | * | |
405 | * Callback for the thermal cooling device to return the cpufreq | |
406 | * current cooling state. | |
407 | * | |
408 | * Return: 0 on success, an error code otherwise. | |
409 | */ | |
410 | static int cpufreq_get_cur_state(struct thermal_cooling_device *cdev, | |
411 | unsigned long *state) | |
412 | { | |
413 | struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata; | |
414 | ||
415 | *state = cpufreq_cdev->cpufreq_state; | |
416 | ||
417 | return 0; | |
418 | } | |
419 | ||
420 | /** | |
421 | * cpufreq_set_cur_state - callback function to set the current cooling state. | |
422 | * @cdev: thermal cooling device pointer. | |
423 | * @state: set this variable to the current cooling state. | |
424 | * | |
425 | * Callback for the thermal cooling device to change the cpufreq | |
426 | * current cooling state. | |
427 | * | |
428 | * Return: 0 on success, an error code otherwise. | |
429 | */ | |
430 | static int cpufreq_set_cur_state(struct thermal_cooling_device *cdev, | |
431 | unsigned long state) | |
432 | { | |
433 | struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata; | |
f12e4f66 TG |
434 | struct cpumask *cpus; |
435 | unsigned int frequency; | |
436 | unsigned long max_capacity, capacity; | |
437 | int ret; | |
5a4e5b78 QP |
438 | |
439 | /* Request state should be less than max_level */ | |
40ea5685 | 440 | if (state > cpufreq_cdev->max_level) |
5a4e5b78 QP |
441 | return -EINVAL; |
442 | ||
443 | /* Check if the old cooling action is same as new cooling action */ | |
444 | if (cpufreq_cdev->cpufreq_state == state) | |
445 | return 0; | |
446 | ||
447 | cpufreq_cdev->cpufreq_state = state; | |
448 | ||
f12e4f66 TG |
449 | frequency = get_state_freq(cpufreq_cdev, state); |
450 | ||
451 | ret = freq_qos_update_request(&cpufreq_cdev->qos_req, frequency); | |
452 | ||
453 | if (ret > 0) { | |
454 | cpus = cpufreq_cdev->policy->cpus; | |
455 | max_capacity = arch_scale_cpu_capacity(cpumask_first(cpus)); | |
456 | capacity = frequency * max_capacity; | |
457 | capacity /= cpufreq_cdev->policy->cpuinfo.max_freq; | |
458 | arch_set_thermal_pressure(cpus, max_capacity - capacity); | |
34183ddd | 459 | ret = 0; |
f12e4f66 TG |
460 | } |
461 | ||
462 | return ret; | |
5a4e5b78 | 463 | } |
c36cf071 | 464 | |
02361418 | 465 | /* Bind cpufreq callbacks to thermal cooling device ops */ |
a305a438 | 466 | |
c36cf071 | 467 | static struct thermal_cooling_device_ops cpufreq_cooling_ops = { |
a305a438 BJ |
468 | .get_max_state = cpufreq_get_max_state, |
469 | .get_cur_state = cpufreq_get_cur_state, | |
470 | .set_cur_state = cpufreq_set_cur_state, | |
a305a438 BJ |
471 | }; |
472 | ||
02361418 | 473 | /** |
39d99cff EV |
474 | * __cpufreq_cooling_register - helper function to create cpufreq cooling device |
475 | * @np: a valid struct device_node to the cooling device device tree node | |
4d753aa7 | 476 | * @policy: cpufreq policy |
405fb825 | 477 | * Normally this should be same as cpufreq policy->related_cpus. |
a4e893e8 | 478 | * @em: Energy Model of the cpufreq policy |
12cb08ba EV |
479 | * |
480 | * This interface function registers the cpufreq cooling device with the name | |
481 | * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq | |
39d99cff EV |
482 | * cooling devices. It also gives the opportunity to link the cooling device |
483 | * with a device tree node, in order to bind it via the thermal DT code. | |
12cb08ba EV |
484 | * |
485 | * Return: a valid struct thermal_cooling_device pointer on success, | |
486 | * on failure, it returns a corresponding ERR_PTR(). | |
02361418 | 487 | */ |
39d99cff EV |
488 | static struct thermal_cooling_device * |
489 | __cpufreq_cooling_register(struct device_node *np, | |
a4e893e8 QP |
490 | struct cpufreq_policy *policy, |
491 | struct em_perf_domain *em) | |
02361418 | 492 | { |
04bdbdf9 | 493 | struct thermal_cooling_device *cdev; |
1dea432a | 494 | struct cpufreq_cooling_device *cpufreq_cdev; |
02361418 | 495 | char dev_name[THERMAL_NAME_LENGTH]; |
a4e893e8 | 496 | unsigned int i, num_cpus; |
5130802d | 497 | struct device *dev; |
405fb825 | 498 | int ret; |
a305a438 | 499 | struct thermal_cooling_device_ops *cooling_ops; |
5130802d VK |
500 | |
501 | dev = get_cpu_device(policy->cpu); | |
502 | if (unlikely(!dev)) { | |
503 | pr_warn("No cpu device for cpu %d\n", policy->cpu); | |
504 | return ERR_PTR(-ENODEV); | |
505 | } | |
506 | ||
02361418 | 507 | |
4d753aa7 | 508 | if (IS_ERR_OR_NULL(policy)) { |
b2fd708f | 509 | pr_err("%s: cpufreq policy isn't valid: %p\n", __func__, policy); |
4d753aa7 | 510 | return ERR_PTR(-EINVAL); |
f8bfc116 VK |
511 | } |
512 | ||
55d85293 VK |
513 | i = cpufreq_table_count_valid_entries(policy); |
514 | if (!i) { | |
515 | pr_debug("%s: CPUFreq table not found or has no valid entries\n", | |
516 | __func__); | |
4d753aa7 | 517 | return ERR_PTR(-ENODEV); |
02361418 | 518 | } |
0f1be51c | 519 | |
1dea432a | 520 | cpufreq_cdev = kzalloc(sizeof(*cpufreq_cdev), GFP_KERNEL); |
4d753aa7 VK |
521 | if (!cpufreq_cdev) |
522 | return ERR_PTR(-ENOMEM); | |
02361418 | 523 | |
b12b6519 | 524 | cpufreq_cdev->policy = policy; |
4d753aa7 | 525 | num_cpus = cpumask_weight(policy->related_cpus); |
81ee14da VK |
526 | cpufreq_cdev->idle_time = kcalloc(num_cpus, |
527 | sizeof(*cpufreq_cdev->idle_time), | |
528 | GFP_KERNEL); | |
529 | if (!cpufreq_cdev->idle_time) { | |
04bdbdf9 | 530 | cdev = ERR_PTR(-ENOMEM); |
c36cf071 JM |
531 | goto free_cdev; |
532 | } | |
533 | ||
55d85293 VK |
534 | /* max_level is an index, not a counter */ |
535 | cpufreq_cdev->max_level = i - 1; | |
dcc6c7fd | 536 | |
ae606089 MW |
537 | ret = ida_simple_get(&cpufreq_ida, 0, 0, GFP_KERNEL); |
538 | if (ret < 0) { | |
04bdbdf9 | 539 | cdev = ERR_PTR(ret); |
a4e893e8 | 540 | goto free_idle_time; |
02361418 | 541 | } |
1dea432a | 542 | cpufreq_cdev->id = ret; |
02361418 | 543 | |
349d39dc VK |
544 | snprintf(dev_name, sizeof(dev_name), "thermal-cpufreq-%d", |
545 | cpufreq_cdev->id); | |
546 | ||
5a4e5b78 QP |
547 | cooling_ops = &cpufreq_cooling_ops; |
548 | ||
549 | #ifdef CONFIG_THERMAL_GOV_POWER_ALLOCATOR | |
a4e893e8 QP |
550 | if (em_is_sane(cpufreq_cdev, em)) { |
551 | cpufreq_cdev->em = em; | |
5a4e5b78 QP |
552 | cooling_ops->get_requested_power = cpufreq_get_requested_power; |
553 | cooling_ops->state2power = cpufreq_state2power; | |
554 | cooling_ops->power2state = cpufreq_power2state; | |
a4e893e8 | 555 | } else |
5a4e5b78 | 556 | #endif |
a4e893e8 QP |
557 | if (policy->freq_table_sorted == CPUFREQ_TABLE_UNSORTED) { |
558 | pr_err("%s: unsorted frequency tables are not supported\n", | |
559 | __func__); | |
560 | cdev = ERR_PTR(-EINVAL); | |
561 | goto remove_ida; | |
562 | } | |
f840ab18 | 563 | |
3000ce3c RW |
564 | ret = freq_qos_add_request(&policy->constraints, |
565 | &cpufreq_cdev->qos_req, FREQ_QOS_MAX, | |
a4e893e8 | 566 | get_state_freq(cpufreq_cdev, 0)); |
5130802d VK |
567 | if (ret < 0) { |
568 | pr_err("%s: Failed to add freq constraint (%d)\n", __func__, | |
569 | ret); | |
570 | cdev = ERR_PTR(ret); | |
571 | goto remove_ida; | |
572 | } | |
573 | ||
04bdbdf9 VK |
574 | cdev = thermal_of_cooling_device_register(np, dev_name, cpufreq_cdev, |
575 | cooling_ops); | |
576 | if (IS_ERR(cdev)) | |
5130802d | 577 | goto remove_qos_req; |
92e615ec | 578 | |
02373d7c | 579 | mutex_lock(&cooling_list_lock); |
1dea432a | 580 | list_add(&cpufreq_cdev->node, &cpufreq_cdev_list); |
088db931 | 581 | mutex_unlock(&cooling_list_lock); |
02373d7c | 582 | |
4d753aa7 | 583 | return cdev; |
730abe06 | 584 | |
5130802d | 585 | remove_qos_req: |
3000ce3c | 586 | freq_qos_remove_request(&cpufreq_cdev->qos_req); |
ae606089 | 587 | remove_ida: |
1dea432a | 588 | ida_simple_remove(&cpufreq_ida, cpufreq_cdev->id); |
81ee14da VK |
589 | free_idle_time: |
590 | kfree(cpufreq_cdev->idle_time); | |
730abe06 | 591 | free_cdev: |
1dea432a | 592 | kfree(cpufreq_cdev); |
04bdbdf9 | 593 | return cdev; |
02361418 | 594 | } |
39d99cff EV |
595 | |
596 | /** | |
597 | * cpufreq_cooling_register - function to create cpufreq cooling device. | |
4d753aa7 | 598 | * @policy: cpufreq policy |
39d99cff EV |
599 | * |
600 | * This interface function registers the cpufreq cooling device with the name | |
601 | * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq | |
602 | * cooling devices. | |
603 | * | |
604 | * Return: a valid struct thermal_cooling_device pointer on success, | |
605 | * on failure, it returns a corresponding ERR_PTR(). | |
606 | */ | |
607 | struct thermal_cooling_device * | |
4d753aa7 | 608 | cpufreq_cooling_register(struct cpufreq_policy *policy) |
39d99cff | 609 | { |
a4e893e8 | 610 | return __cpufreq_cooling_register(NULL, policy, NULL); |
39d99cff | 611 | } |
243dbd9c | 612 | EXPORT_SYMBOL_GPL(cpufreq_cooling_register); |
02361418 | 613 | |
39d99cff EV |
614 | /** |
615 | * of_cpufreq_cooling_register - function to create cpufreq cooling device. | |
4d753aa7 | 616 | * @policy: cpufreq policy |
39d99cff EV |
617 | * |
618 | * This interface function registers the cpufreq cooling device with the name | |
619 | * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq | |
620 | * cooling devices. Using this API, the cpufreq cooling device will be | |
621 | * linked to the device tree node provided. | |
622 | * | |
c36cf071 JM |
623 | * Using this function, the cooling device will implement the power |
624 | * extensions by using a simple cpu power model. The cpus must have | |
625 | * registered their OPPs using the OPP library. | |
626 | * | |
f5f263fe VK |
627 | * It also takes into account, if property present in policy CPU node, the |
628 | * static power consumed by the cpu. | |
c36cf071 JM |
629 | * |
630 | * Return: a valid struct thermal_cooling_device pointer on success, | |
f5f263fe | 631 | * and NULL on failure. |
c36cf071 JM |
632 | */ |
633 | struct thermal_cooling_device * | |
3ebb62ff | 634 | of_cpufreq_cooling_register(struct cpufreq_policy *policy) |
c36cf071 | 635 | { |
f5f263fe VK |
636 | struct device_node *np = of_get_cpu_node(policy->cpu, NULL); |
637 | struct thermal_cooling_device *cdev = NULL; | |
f5f263fe VK |
638 | |
639 | if (!np) { | |
23affa2e | 640 | pr_err("cpufreq_cooling: OF node not available for cpu%d\n", |
f5f263fe VK |
641 | policy->cpu); |
642 | return NULL; | |
643 | } | |
c36cf071 | 644 | |
f5f263fe | 645 | if (of_find_property(np, "#cooling-cells", NULL)) { |
a4e893e8 | 646 | struct em_perf_domain *em = em_cpu_get(policy->cpu); |
f5f263fe | 647 | |
a4e893e8 | 648 | cdev = __cpufreq_cooling_register(np, policy, em); |
f5f263fe | 649 | if (IS_ERR(cdev)) { |
23affa2e | 650 | pr_err("cpufreq_cooling: cpu%d failed to register as cooling device: %ld\n", |
f5f263fe VK |
651 | policy->cpu, PTR_ERR(cdev)); |
652 | cdev = NULL; | |
653 | } | |
654 | } | |
655 | ||
656 | of_node_put(np); | |
657 | return cdev; | |
c36cf071 | 658 | } |
3ebb62ff | 659 | EXPORT_SYMBOL_GPL(of_cpufreq_cooling_register); |
c36cf071 | 660 | |
02361418 ADK |
661 | /** |
662 | * cpufreq_cooling_unregister - function to remove cpufreq cooling device. | |
663 | * @cdev: thermal cooling device pointer. | |
135266b4 EV |
664 | * |
665 | * This interface function unregisters the "thermal-cpufreq-%x" cooling device. | |
02361418 ADK |
666 | */ |
667 | void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev) | |
668 | { | |
1dea432a | 669 | struct cpufreq_cooling_device *cpufreq_cdev; |
02361418 | 670 | |
50e66c7e EV |
671 | if (!cdev) |
672 | return; | |
673 | ||
1dea432a | 674 | cpufreq_cdev = cdev->devdata; |
02361418 | 675 | |
ae606089 | 676 | mutex_lock(&cooling_list_lock); |
1dea432a | 677 | list_del(&cpufreq_cdev->node); |
088db931 MW |
678 | mutex_unlock(&cooling_list_lock); |
679 | ||
72554a75 | 680 | thermal_cooling_device_unregister(cdev); |
3000ce3c | 681 | freq_qos_remove_request(&cpufreq_cdev->qos_req); |
1dea432a | 682 | ida_simple_remove(&cpufreq_ida, cpufreq_cdev->id); |
81ee14da | 683 | kfree(cpufreq_cdev->idle_time); |
1dea432a | 684 | kfree(cpufreq_cdev); |
02361418 | 685 | } |
243dbd9c | 686 | EXPORT_SYMBOL_GPL(cpufreq_cooling_unregister); |