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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; |
d1515851 | 79 | #ifndef CONFIG_SMP |
81ee14da | 80 | struct time_in_idle *idle_time; |
d1515851 | 81 | #endif |
3000ce3c | 82 | struct freq_qos_request qos_req; |
02361418 | 83 | }; |
02361418 | 84 | |
fb8ea308 | 85 | static DEFINE_IDA(cpufreq_ida); |
02373d7c | 86 | static DEFINE_MUTEX(cooling_list_lock); |
1dea432a | 87 | static LIST_HEAD(cpufreq_cdev_list); |
02361418 | 88 | |
5a4e5b78 | 89 | #ifdef CONFIG_THERMAL_GOV_POWER_ALLOCATOR |
02361418 | 90 | /** |
4843c4a1 | 91 | * get_level: Find the level for a particular frequency |
1dea432a | 92 | * @cpufreq_cdev: cpufreq_cdev for which the property is required |
4843c4a1 | 93 | * @freq: Frequency |
82b9ee40 | 94 | * |
da27f69d | 95 | * Return: level corresponding to the frequency. |
02361418 | 96 | */ |
1dea432a | 97 | static unsigned long get_level(struct cpufreq_cooling_device *cpufreq_cdev, |
4843c4a1 | 98 | unsigned int freq) |
02361418 | 99 | { |
a4e893e8 | 100 | int i; |
a116776f | 101 | |
a4e893e8 QP |
102 | for (i = cpufreq_cdev->max_level - 1; i >= 0; i--) { |
103 | if (freq > cpufreq_cdev->em->table[i].frequency) | |
4843c4a1 | 104 | break; |
c36cf071 | 105 | } |
02361418 | 106 | |
a4e893e8 | 107 | return cpufreq_cdev->max_level - i - 1; |
c36cf071 JM |
108 | } |
109 | ||
1dea432a | 110 | static u32 cpu_freq_to_power(struct cpufreq_cooling_device *cpufreq_cdev, |
c36cf071 JM |
111 | u32 freq) |
112 | { | |
113 | int i; | |
c36cf071 | 114 | |
a4e893e8 QP |
115 | for (i = cpufreq_cdev->max_level - 1; i >= 0; i--) { |
116 | if (freq > cpufreq_cdev->em->table[i].frequency) | |
c36cf071 | 117 | break; |
a4e893e8 | 118 | } |
c36cf071 | 119 | |
a4e893e8 | 120 | return cpufreq_cdev->em->table[i + 1].power; |
c36cf071 JM |
121 | } |
122 | ||
1dea432a | 123 | static u32 cpu_power_to_freq(struct cpufreq_cooling_device *cpufreq_cdev, |
c36cf071 JM |
124 | u32 power) |
125 | { | |
126 | int i; | |
c36cf071 | 127 | |
371a3bc7 FX |
128 | for (i = cpufreq_cdev->max_level; i >= 0; i--) { |
129 | if (power >= cpufreq_cdev->em->table[i].power) | |
c36cf071 | 130 | break; |
a4e893e8 | 131 | } |
c36cf071 | 132 | |
371a3bc7 | 133 | return cpufreq_cdev->em->table[i].frequency; |
c36cf071 JM |
134 | } |
135 | ||
136 | /** | |
d1515851 VK |
137 | * get_load() - get load for a cpu |
138 | * @cpufreq_cdev: struct cpufreq_cooling_device for the cpu | |
139 | * @cpu: cpu number | |
140 | * @cpu_idx: index of the cpu in time_in_idle array | |
c36cf071 JM |
141 | * |
142 | * Return: The average load of cpu @cpu in percentage since this | |
143 | * function was last called. | |
144 | */ | |
d1515851 VK |
145 | #ifdef CONFIG_SMP |
146 | static u32 get_load(struct cpufreq_cooling_device *cpufreq_cdev, int cpu, | |
147 | int cpu_idx) | |
148 | { | |
149 | unsigned long max = arch_scale_cpu_capacity(cpu); | |
150 | unsigned long util; | |
151 | ||
152 | util = sched_cpu_util(cpu, max); | |
153 | return (util * 100) / max; | |
154 | } | |
155 | #else /* !CONFIG_SMP */ | |
1dea432a | 156 | static u32 get_load(struct cpufreq_cooling_device *cpufreq_cdev, int cpu, |
a53b8394 | 157 | int cpu_idx) |
c36cf071 JM |
158 | { |
159 | u32 load; | |
160 | u64 now, now_idle, delta_time, delta_idle; | |
81ee14da | 161 | struct time_in_idle *idle_time = &cpufreq_cdev->idle_time[cpu_idx]; |
c36cf071 JM |
162 | |
163 | now_idle = get_cpu_idle_time(cpu, &now, 0); | |
81ee14da VK |
164 | delta_idle = now_idle - idle_time->time; |
165 | delta_time = now - idle_time->timestamp; | |
c36cf071 JM |
166 | |
167 | if (delta_time <= delta_idle) | |
168 | load = 0; | |
169 | else | |
170 | load = div64_u64(100 * (delta_time - delta_idle), delta_time); | |
171 | ||
81ee14da VK |
172 | idle_time->time = now_idle; |
173 | idle_time->timestamp = now; | |
c36cf071 JM |
174 | |
175 | return load; | |
176 | } | |
d1515851 | 177 | #endif /* CONFIG_SMP */ |
c36cf071 | 178 | |
c36cf071 JM |
179 | /** |
180 | * get_dynamic_power() - calculate the dynamic power | |
1dea432a | 181 | * @cpufreq_cdev: &cpufreq_cooling_device for this cdev |
c36cf071 JM |
182 | * @freq: current frequency |
183 | * | |
184 | * Return: the dynamic power consumed by the cpus described by | |
1dea432a | 185 | * @cpufreq_cdev. |
c36cf071 | 186 | */ |
1dea432a | 187 | static u32 get_dynamic_power(struct cpufreq_cooling_device *cpufreq_cdev, |
c36cf071 JM |
188 | unsigned long freq) |
189 | { | |
190 | u32 raw_cpu_power; | |
191 | ||
1dea432a VK |
192 | raw_cpu_power = cpu_freq_to_power(cpufreq_cdev, freq); |
193 | return (raw_cpu_power * cpufreq_cdev->last_load) / 100; | |
02361418 ADK |
194 | } |
195 | ||
c36cf071 JM |
196 | /** |
197 | * cpufreq_get_requested_power() - get the current power | |
198 | * @cdev: &thermal_cooling_device pointer | |
c36cf071 JM |
199 | * @power: pointer in which to store the resulting power |
200 | * | |
201 | * Calculate the current power consumption of the cpus in milliwatts | |
202 | * and store it in @power. This function should actually calculate | |
203 | * the requested power, but it's hard to get the frequency that | |
204 | * cpufreq would have assigned if there were no thermal limits. | |
205 | * Instead, we calculate the current power on the assumption that the | |
206 | * immediate future will look like the immediate past. | |
207 | * | |
208 | * We use the current frequency and the average load since this | |
209 | * function was last called. In reality, there could have been | |
210 | * multiple opps since this function was last called and that affects | |
211 | * the load calculation. While it's not perfectly accurate, this | |
212 | * simplification is good enough and works. REVISIT this, as more | |
213 | * complex code may be needed if experiments show that it's not | |
214 | * accurate enough. | |
215 | * | |
216 | * Return: 0 on success, -E* if getting the static power failed. | |
217 | */ | |
218 | static int cpufreq_get_requested_power(struct thermal_cooling_device *cdev, | |
c36cf071 JM |
219 | u32 *power) |
220 | { | |
221 | unsigned long freq; | |
84fe2cab VK |
222 | int i = 0, cpu; |
223 | u32 total_load = 0; | |
1dea432a | 224 | struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata; |
ba76dd9d | 225 | struct cpufreq_policy *policy = cpufreq_cdev->policy; |
6828a471 | 226 | u32 *load_cpu = NULL; |
c36cf071 | 227 | |
ba76dd9d | 228 | freq = cpufreq_quick_get(policy->cpu); |
c36cf071 | 229 | |
6828a471 | 230 | if (trace_thermal_power_cpu_get_power_enabled()) { |
ba76dd9d | 231 | u32 ncpus = cpumask_weight(policy->related_cpus); |
6828a471 | 232 | |
a71544cd | 233 | load_cpu = kcalloc(ncpus, sizeof(*load_cpu), GFP_KERNEL); |
6828a471 JM |
234 | } |
235 | ||
ba76dd9d | 236 | for_each_cpu(cpu, policy->related_cpus) { |
c36cf071 JM |
237 | u32 load; |
238 | ||
239 | if (cpu_online(cpu)) | |
1dea432a | 240 | load = get_load(cpufreq_cdev, cpu, i); |
c36cf071 JM |
241 | else |
242 | load = 0; | |
243 | ||
244 | total_load += load; | |
bf45ac18 | 245 | if (load_cpu) |
6828a471 JM |
246 | load_cpu[i] = load; |
247 | ||
248 | i++; | |
c36cf071 JM |
249 | } |
250 | ||
1dea432a | 251 | cpufreq_cdev->last_load = total_load; |
c36cf071 | 252 | |
84fe2cab | 253 | *power = get_dynamic_power(cpufreq_cdev, freq); |
6828a471 JM |
254 | |
255 | if (load_cpu) { | |
ba76dd9d | 256 | trace_thermal_power_cpu_get_power(policy->related_cpus, freq, |
84fe2cab | 257 | load_cpu, i, *power); |
6828a471 | 258 | |
a71544cd | 259 | kfree(load_cpu); |
6828a471 | 260 | } |
c36cf071 | 261 | |
c36cf071 JM |
262 | return 0; |
263 | } | |
264 | ||
265 | /** | |
266 | * cpufreq_state2power() - convert a cpu cdev state to power consumed | |
267 | * @cdev: &thermal_cooling_device pointer | |
c36cf071 JM |
268 | * @state: cooling device state to be converted |
269 | * @power: pointer in which to store the resulting power | |
270 | * | |
271 | * Convert cooling device state @state into power consumption in | |
272 | * milliwatts assuming 100% load. Store the calculated power in | |
273 | * @power. | |
274 | * | |
275 | * Return: 0 on success, -EINVAL if the cooling device state could not | |
276 | * be converted into a frequency or other -E* if there was an error | |
277 | * when calculating the static power. | |
278 | */ | |
279 | static int cpufreq_state2power(struct thermal_cooling_device *cdev, | |
c36cf071 JM |
280 | unsigned long state, u32 *power) |
281 | { | |
a4e893e8 | 282 | unsigned int freq, num_cpus, idx; |
1dea432a | 283 | struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata; |
c36cf071 | 284 | |
cb1b6318 | 285 | /* Request state should be less than max_level */ |
40ea5685 | 286 | if (state > cpufreq_cdev->max_level) |
cb1b6318 VK |
287 | return -EINVAL; |
288 | ||
ba76dd9d | 289 | num_cpus = cpumask_weight(cpufreq_cdev->policy->cpus); |
c36cf071 | 290 | |
a4e893e8 QP |
291 | idx = cpufreq_cdev->max_level - state; |
292 | freq = cpufreq_cdev->em->table[idx].frequency; | |
84fe2cab | 293 | *power = cpu_freq_to_power(cpufreq_cdev, freq) * num_cpus; |
c36cf071 | 294 | |
84fe2cab | 295 | return 0; |
c36cf071 JM |
296 | } |
297 | ||
298 | /** | |
299 | * cpufreq_power2state() - convert power to a cooling device state | |
300 | * @cdev: &thermal_cooling_device pointer | |
c36cf071 JM |
301 | * @power: power in milliwatts to be converted |
302 | * @state: pointer in which to store the resulting state | |
303 | * | |
304 | * Calculate a cooling device state for the cpus described by @cdev | |
305 | * that would allow them to consume at most @power mW and store it in | |
306 | * @state. Note that this calculation depends on external factors | |
307 | * such as the cpu load or the current static power. Calling this | |
308 | * function with the same power as input can yield different cooling | |
309 | * device states depending on those external factors. | |
310 | * | |
311 | * Return: 0 on success, -ENODEV if no cpus are online or -EINVAL if | |
312 | * the calculated frequency could not be converted to a valid state. | |
313 | * The latter should not happen unless the frequencies available to | |
314 | * cpufreq have changed since the initialization of the cpu cooling | |
315 | * device. | |
316 | */ | |
317 | static int cpufreq_power2state(struct thermal_cooling_device *cdev, | |
ecd1d2a3 | 318 | u32 power, unsigned long *state) |
c36cf071 | 319 | { |
e0fda737 | 320 | unsigned int target_freq; |
84fe2cab | 321 | u32 last_load, normalised_power; |
1dea432a | 322 | struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata; |
ba76dd9d | 323 | struct cpufreq_policy *policy = cpufreq_cdev->policy; |
c36cf071 | 324 | |
1dea432a | 325 | last_load = cpufreq_cdev->last_load ?: 1; |
84fe2cab | 326 | normalised_power = (power * 100) / last_load; |
1dea432a | 327 | target_freq = cpu_power_to_freq(cpufreq_cdev, normalised_power); |
c36cf071 | 328 | |
3e08b2df | 329 | *state = get_level(cpufreq_cdev, target_freq); |
ba76dd9d VK |
330 | trace_thermal_power_cpu_limit(policy->related_cpus, target_freq, *state, |
331 | power); | |
c36cf071 JM |
332 | return 0; |
333 | } | |
a4e893e8 QP |
334 | |
335 | static inline bool em_is_sane(struct cpufreq_cooling_device *cpufreq_cdev, | |
336 | struct em_perf_domain *em) { | |
337 | struct cpufreq_policy *policy; | |
338 | unsigned int nr_levels; | |
339 | ||
340 | if (!em) | |
341 | return false; | |
342 | ||
343 | policy = cpufreq_cdev->policy; | |
521b512b | 344 | if (!cpumask_equal(policy->related_cpus, em_span_cpus(em))) { |
a4e893e8 | 345 | pr_err("The span of pd %*pbl is misaligned with cpufreq policy %*pbl\n", |
521b512b | 346 | cpumask_pr_args(em_span_cpus(em)), |
a4e893e8 QP |
347 | cpumask_pr_args(policy->related_cpus)); |
348 | return false; | |
349 | } | |
350 | ||
351 | nr_levels = cpufreq_cdev->max_level + 1; | |
521b512b LL |
352 | if (em_pd_nr_perf_states(em) != nr_levels) { |
353 | pr_err("The number of performance states in pd %*pbl (%u) doesn't match the number of cooling levels (%u)\n", | |
354 | cpumask_pr_args(em_span_cpus(em)), | |
355 | em_pd_nr_perf_states(em), nr_levels); | |
a4e893e8 QP |
356 | return false; |
357 | } | |
358 | ||
359 | return true; | |
360 | } | |
5a4e5b78 QP |
361 | #endif /* CONFIG_THERMAL_GOV_POWER_ALLOCATOR */ |
362 | ||
d1515851 VK |
363 | #ifdef CONFIG_SMP |
364 | static inline int allocate_idle_time(struct cpufreq_cooling_device *cpufreq_cdev) | |
365 | { | |
366 | return 0; | |
367 | } | |
368 | ||
369 | static inline void free_idle_time(struct cpufreq_cooling_device *cpufreq_cdev) | |
370 | { | |
371 | } | |
372 | #else | |
373 | static int allocate_idle_time(struct cpufreq_cooling_device *cpufreq_cdev) | |
374 | { | |
375 | unsigned int num_cpus = cpumask_weight(cpufreq_cdev->policy->related_cpus); | |
376 | ||
377 | cpufreq_cdev->idle_time = kcalloc(num_cpus, | |
378 | sizeof(*cpufreq_cdev->idle_time), | |
379 | GFP_KERNEL); | |
380 | if (!cpufreq_cdev->idle_time) | |
381 | return -ENOMEM; | |
382 | ||
383 | return 0; | |
384 | } | |
385 | ||
386 | static void free_idle_time(struct cpufreq_cooling_device *cpufreq_cdev) | |
387 | { | |
388 | kfree(cpufreq_cdev->idle_time); | |
389 | cpufreq_cdev->idle_time = NULL; | |
390 | } | |
391 | #endif /* CONFIG_SMP */ | |
392 | ||
a4e893e8 QP |
393 | static unsigned int get_state_freq(struct cpufreq_cooling_device *cpufreq_cdev, |
394 | unsigned long state) | |
395 | { | |
396 | struct cpufreq_policy *policy; | |
397 | unsigned long idx; | |
398 | ||
399 | #ifdef CONFIG_THERMAL_GOV_POWER_ALLOCATOR | |
400 | /* Use the Energy Model table if available */ | |
401 | if (cpufreq_cdev->em) { | |
402 | idx = cpufreq_cdev->max_level - state; | |
403 | return cpufreq_cdev->em->table[idx].frequency; | |
404 | } | |
405 | #endif | |
406 | ||
407 | /* Otherwise, fallback on the CPUFreq table */ | |
408 | policy = cpufreq_cdev->policy; | |
409 | if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING) | |
410 | idx = cpufreq_cdev->max_level - state; | |
411 | else | |
412 | idx = state; | |
413 | ||
414 | return policy->freq_table[idx].frequency; | |
415 | } | |
416 | ||
5a4e5b78 QP |
417 | /* cpufreq cooling device callback functions are defined below */ |
418 | ||
419 | /** | |
420 | * cpufreq_get_max_state - callback function to get the max cooling state. | |
421 | * @cdev: thermal cooling device pointer. | |
422 | * @state: fill this variable with the max cooling state. | |
423 | * | |
424 | * Callback for the thermal cooling device to return the cpufreq | |
425 | * max cooling state. | |
426 | * | |
427 | * Return: 0 on success, an error code otherwise. | |
428 | */ | |
429 | static int cpufreq_get_max_state(struct thermal_cooling_device *cdev, | |
430 | unsigned long *state) | |
431 | { | |
432 | struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata; | |
433 | ||
434 | *state = cpufreq_cdev->max_level; | |
435 | return 0; | |
436 | } | |
437 | ||
438 | /** | |
439 | * cpufreq_get_cur_state - callback function to get the current cooling state. | |
440 | * @cdev: thermal cooling device pointer. | |
441 | * @state: fill this variable with the current cooling state. | |
442 | * | |
443 | * Callback for the thermal cooling device to return the cpufreq | |
444 | * current cooling state. | |
445 | * | |
446 | * Return: 0 on success, an error code otherwise. | |
447 | */ | |
448 | static int cpufreq_get_cur_state(struct thermal_cooling_device *cdev, | |
449 | unsigned long *state) | |
450 | { | |
451 | struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata; | |
452 | ||
453 | *state = cpufreq_cdev->cpufreq_state; | |
454 | ||
455 | return 0; | |
456 | } | |
457 | ||
458 | /** | |
459 | * cpufreq_set_cur_state - callback function to set the current cooling state. | |
460 | * @cdev: thermal cooling device pointer. | |
461 | * @state: set this variable to the current cooling state. | |
462 | * | |
463 | * Callback for the thermal cooling device to change the cpufreq | |
464 | * current cooling state. | |
465 | * | |
466 | * Return: 0 on success, an error code otherwise. | |
467 | */ | |
468 | static int cpufreq_set_cur_state(struct thermal_cooling_device *cdev, | |
469 | unsigned long state) | |
470 | { | |
471 | struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata; | |
f12e4f66 TG |
472 | struct cpumask *cpus; |
473 | unsigned int frequency; | |
474 | unsigned long max_capacity, capacity; | |
475 | int ret; | |
5a4e5b78 QP |
476 | |
477 | /* Request state should be less than max_level */ | |
40ea5685 | 478 | if (state > cpufreq_cdev->max_level) |
5a4e5b78 QP |
479 | return -EINVAL; |
480 | ||
481 | /* Check if the old cooling action is same as new cooling action */ | |
482 | if (cpufreq_cdev->cpufreq_state == state) | |
483 | return 0; | |
484 | ||
f12e4f66 TG |
485 | frequency = get_state_freq(cpufreq_cdev, state); |
486 | ||
487 | ret = freq_qos_update_request(&cpufreq_cdev->qos_req, frequency); | |
a51afb13 | 488 | if (ret >= 0) { |
236761f1 | 489 | cpufreq_cdev->cpufreq_state = state; |
f12e4f66 TG |
490 | cpus = cpufreq_cdev->policy->cpus; |
491 | max_capacity = arch_scale_cpu_capacity(cpumask_first(cpus)); | |
492 | capacity = frequency * max_capacity; | |
493 | capacity /= cpufreq_cdev->policy->cpuinfo.max_freq; | |
494 | arch_set_thermal_pressure(cpus, max_capacity - capacity); | |
34183ddd | 495 | ret = 0; |
f12e4f66 TG |
496 | } |
497 | ||
498 | return ret; | |
5a4e5b78 | 499 | } |
c36cf071 | 500 | |
02361418 | 501 | /* Bind cpufreq callbacks to thermal cooling device ops */ |
a305a438 | 502 | |
c36cf071 | 503 | static struct thermal_cooling_device_ops cpufreq_cooling_ops = { |
a305a438 BJ |
504 | .get_max_state = cpufreq_get_max_state, |
505 | .get_cur_state = cpufreq_get_cur_state, | |
506 | .set_cur_state = cpufreq_set_cur_state, | |
a305a438 BJ |
507 | }; |
508 | ||
02361418 | 509 | /** |
39d99cff EV |
510 | * __cpufreq_cooling_register - helper function to create cpufreq cooling device |
511 | * @np: a valid struct device_node to the cooling device device tree node | |
4d753aa7 | 512 | * @policy: cpufreq policy |
405fb825 | 513 | * Normally this should be same as cpufreq policy->related_cpus. |
a4e893e8 | 514 | * @em: Energy Model of the cpufreq policy |
12cb08ba EV |
515 | * |
516 | * This interface function registers the cpufreq cooling device with the name | |
517 | * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq | |
39d99cff EV |
518 | * cooling devices. It also gives the opportunity to link the cooling device |
519 | * with a device tree node, in order to bind it via the thermal DT code. | |
12cb08ba EV |
520 | * |
521 | * Return: a valid struct thermal_cooling_device pointer on success, | |
522 | * on failure, it returns a corresponding ERR_PTR(). | |
02361418 | 523 | */ |
39d99cff EV |
524 | static struct thermal_cooling_device * |
525 | __cpufreq_cooling_register(struct device_node *np, | |
a4e893e8 QP |
526 | struct cpufreq_policy *policy, |
527 | struct em_perf_domain *em) | |
02361418 | 528 | { |
04bdbdf9 | 529 | struct thermal_cooling_device *cdev; |
1dea432a | 530 | struct cpufreq_cooling_device *cpufreq_cdev; |
02361418 | 531 | char dev_name[THERMAL_NAME_LENGTH]; |
d1515851 | 532 | unsigned int i; |
5130802d | 533 | struct device *dev; |
405fb825 | 534 | int ret; |
a305a438 | 535 | struct thermal_cooling_device_ops *cooling_ops; |
5130802d VK |
536 | |
537 | dev = get_cpu_device(policy->cpu); | |
538 | if (unlikely(!dev)) { | |
539 | pr_warn("No cpu device for cpu %d\n", policy->cpu); | |
540 | return ERR_PTR(-ENODEV); | |
541 | } | |
542 | ||
4d753aa7 | 543 | if (IS_ERR_OR_NULL(policy)) { |
b2fd708f | 544 | pr_err("%s: cpufreq policy isn't valid: %p\n", __func__, policy); |
4d753aa7 | 545 | return ERR_PTR(-EINVAL); |
f8bfc116 VK |
546 | } |
547 | ||
55d85293 VK |
548 | i = cpufreq_table_count_valid_entries(policy); |
549 | if (!i) { | |
550 | pr_debug("%s: CPUFreq table not found or has no valid entries\n", | |
551 | __func__); | |
4d753aa7 | 552 | return ERR_PTR(-ENODEV); |
02361418 | 553 | } |
0f1be51c | 554 | |
1dea432a | 555 | cpufreq_cdev = kzalloc(sizeof(*cpufreq_cdev), GFP_KERNEL); |
4d753aa7 VK |
556 | if (!cpufreq_cdev) |
557 | return ERR_PTR(-ENOMEM); | |
02361418 | 558 | |
b12b6519 | 559 | cpufreq_cdev->policy = policy; |
d1515851 VK |
560 | |
561 | ret = allocate_idle_time(cpufreq_cdev); | |
562 | if (ret) { | |
563 | cdev = ERR_PTR(ret); | |
c36cf071 JM |
564 | goto free_cdev; |
565 | } | |
566 | ||
55d85293 VK |
567 | /* max_level is an index, not a counter */ |
568 | cpufreq_cdev->max_level = i - 1; | |
dcc6c7fd | 569 | |
ae606089 MW |
570 | ret = ida_simple_get(&cpufreq_ida, 0, 0, GFP_KERNEL); |
571 | if (ret < 0) { | |
04bdbdf9 | 572 | cdev = ERR_PTR(ret); |
a4e893e8 | 573 | goto free_idle_time; |
02361418 | 574 | } |
1dea432a | 575 | cpufreq_cdev->id = ret; |
02361418 | 576 | |
349d39dc VK |
577 | snprintf(dev_name, sizeof(dev_name), "thermal-cpufreq-%d", |
578 | cpufreq_cdev->id); | |
579 | ||
5a4e5b78 QP |
580 | cooling_ops = &cpufreq_cooling_ops; |
581 | ||
582 | #ifdef CONFIG_THERMAL_GOV_POWER_ALLOCATOR | |
a4e893e8 QP |
583 | if (em_is_sane(cpufreq_cdev, em)) { |
584 | cpufreq_cdev->em = em; | |
5a4e5b78 QP |
585 | cooling_ops->get_requested_power = cpufreq_get_requested_power; |
586 | cooling_ops->state2power = cpufreq_state2power; | |
587 | cooling_ops->power2state = cpufreq_power2state; | |
a4e893e8 | 588 | } else |
5a4e5b78 | 589 | #endif |
a4e893e8 QP |
590 | if (policy->freq_table_sorted == CPUFREQ_TABLE_UNSORTED) { |
591 | pr_err("%s: unsorted frequency tables are not supported\n", | |
592 | __func__); | |
593 | cdev = ERR_PTR(-EINVAL); | |
594 | goto remove_ida; | |
595 | } | |
f840ab18 | 596 | |
3000ce3c RW |
597 | ret = freq_qos_add_request(&policy->constraints, |
598 | &cpufreq_cdev->qos_req, FREQ_QOS_MAX, | |
a4e893e8 | 599 | get_state_freq(cpufreq_cdev, 0)); |
5130802d VK |
600 | if (ret < 0) { |
601 | pr_err("%s: Failed to add freq constraint (%d)\n", __func__, | |
602 | ret); | |
603 | cdev = ERR_PTR(ret); | |
604 | goto remove_ida; | |
605 | } | |
606 | ||
04bdbdf9 VK |
607 | cdev = thermal_of_cooling_device_register(np, dev_name, cpufreq_cdev, |
608 | cooling_ops); | |
609 | if (IS_ERR(cdev)) | |
5130802d | 610 | goto remove_qos_req; |
92e615ec | 611 | |
02373d7c | 612 | mutex_lock(&cooling_list_lock); |
1dea432a | 613 | list_add(&cpufreq_cdev->node, &cpufreq_cdev_list); |
088db931 | 614 | mutex_unlock(&cooling_list_lock); |
02373d7c | 615 | |
4d753aa7 | 616 | return cdev; |
730abe06 | 617 | |
5130802d | 618 | remove_qos_req: |
3000ce3c | 619 | freq_qos_remove_request(&cpufreq_cdev->qos_req); |
ae606089 | 620 | remove_ida: |
1dea432a | 621 | ida_simple_remove(&cpufreq_ida, cpufreq_cdev->id); |
81ee14da | 622 | free_idle_time: |
d1515851 | 623 | free_idle_time(cpufreq_cdev); |
730abe06 | 624 | free_cdev: |
1dea432a | 625 | kfree(cpufreq_cdev); |
04bdbdf9 | 626 | return cdev; |
02361418 | 627 | } |
39d99cff EV |
628 | |
629 | /** | |
630 | * cpufreq_cooling_register - function to create cpufreq cooling device. | |
4d753aa7 | 631 | * @policy: cpufreq policy |
39d99cff EV |
632 | * |
633 | * This interface function registers the cpufreq cooling device with the name | |
634 | * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq | |
635 | * cooling devices. | |
636 | * | |
637 | * Return: a valid struct thermal_cooling_device pointer on success, | |
638 | * on failure, it returns a corresponding ERR_PTR(). | |
639 | */ | |
640 | struct thermal_cooling_device * | |
4d753aa7 | 641 | cpufreq_cooling_register(struct cpufreq_policy *policy) |
39d99cff | 642 | { |
a4e893e8 | 643 | return __cpufreq_cooling_register(NULL, policy, NULL); |
39d99cff | 644 | } |
243dbd9c | 645 | EXPORT_SYMBOL_GPL(cpufreq_cooling_register); |
02361418 | 646 | |
39d99cff EV |
647 | /** |
648 | * of_cpufreq_cooling_register - function to create cpufreq cooling device. | |
4d753aa7 | 649 | * @policy: cpufreq policy |
39d99cff EV |
650 | * |
651 | * This interface function registers the cpufreq cooling device with the name | |
652 | * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq | |
653 | * cooling devices. Using this API, the cpufreq cooling device will be | |
654 | * linked to the device tree node provided. | |
655 | * | |
c36cf071 JM |
656 | * Using this function, the cooling device will implement the power |
657 | * extensions by using a simple cpu power model. The cpus must have | |
658 | * registered their OPPs using the OPP library. | |
659 | * | |
f5f263fe VK |
660 | * It also takes into account, if property present in policy CPU node, the |
661 | * static power consumed by the cpu. | |
c36cf071 JM |
662 | * |
663 | * Return: a valid struct thermal_cooling_device pointer on success, | |
f5f263fe | 664 | * and NULL on failure. |
c36cf071 JM |
665 | */ |
666 | struct thermal_cooling_device * | |
3ebb62ff | 667 | of_cpufreq_cooling_register(struct cpufreq_policy *policy) |
c36cf071 | 668 | { |
f5f263fe VK |
669 | struct device_node *np = of_get_cpu_node(policy->cpu, NULL); |
670 | struct thermal_cooling_device *cdev = NULL; | |
f5f263fe VK |
671 | |
672 | if (!np) { | |
23affa2e | 673 | pr_err("cpufreq_cooling: OF node not available for cpu%d\n", |
f5f263fe VK |
674 | policy->cpu); |
675 | return NULL; | |
676 | } | |
c36cf071 | 677 | |
f5f263fe | 678 | if (of_find_property(np, "#cooling-cells", NULL)) { |
a4e893e8 | 679 | struct em_perf_domain *em = em_cpu_get(policy->cpu); |
f5f263fe | 680 | |
a4e893e8 | 681 | cdev = __cpufreq_cooling_register(np, policy, em); |
f5f263fe | 682 | if (IS_ERR(cdev)) { |
23affa2e | 683 | pr_err("cpufreq_cooling: cpu%d failed to register as cooling device: %ld\n", |
f5f263fe VK |
684 | policy->cpu, PTR_ERR(cdev)); |
685 | cdev = NULL; | |
686 | } | |
687 | } | |
688 | ||
689 | of_node_put(np); | |
690 | return cdev; | |
c36cf071 | 691 | } |
3ebb62ff | 692 | EXPORT_SYMBOL_GPL(of_cpufreq_cooling_register); |
c36cf071 | 693 | |
02361418 ADK |
694 | /** |
695 | * cpufreq_cooling_unregister - function to remove cpufreq cooling device. | |
696 | * @cdev: thermal cooling device pointer. | |
135266b4 EV |
697 | * |
698 | * This interface function unregisters the "thermal-cpufreq-%x" cooling device. | |
02361418 ADK |
699 | */ |
700 | void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev) | |
701 | { | |
1dea432a | 702 | struct cpufreq_cooling_device *cpufreq_cdev; |
02361418 | 703 | |
50e66c7e EV |
704 | if (!cdev) |
705 | return; | |
706 | ||
1dea432a | 707 | cpufreq_cdev = cdev->devdata; |
02361418 | 708 | |
ae606089 | 709 | mutex_lock(&cooling_list_lock); |
1dea432a | 710 | list_del(&cpufreq_cdev->node); |
088db931 MW |
711 | mutex_unlock(&cooling_list_lock); |
712 | ||
72554a75 | 713 | thermal_cooling_device_unregister(cdev); |
3000ce3c | 714 | freq_qos_remove_request(&cpufreq_cdev->qos_req); |
1dea432a | 715 | ida_simple_remove(&cpufreq_ida, cpufreq_cdev->id); |
d1515851 | 716 | free_idle_time(cpufreq_cdev); |
1dea432a | 717 | kfree(cpufreq_cdev); |
02361418 | 718 | } |
243dbd9c | 719 | EXPORT_SYMBOL_GPL(cpufreq_cooling_unregister); |