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0fac9e2f | 1 | // SPDX-License-Identifier: GPL-2.0 |
02361418 ADK |
2 | /* |
3 | * linux/drivers/thermal/cpu_cooling.c | |
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 | */ |
02361418 ADK |
13 | #include <linux/module.h> |
14 | #include <linux/thermal.h> | |
02361418 ADK |
15 | #include <linux/cpufreq.h> |
16 | #include <linux/err.h> | |
ae606089 | 17 | #include <linux/idr.h> |
c36cf071 | 18 | #include <linux/pm_opp.h> |
5130802d | 19 | #include <linux/pm_qos.h> |
02361418 ADK |
20 | #include <linux/slab.h> |
21 | #include <linux/cpu.h> | |
22 | #include <linux/cpu_cooling.h> | |
23 | ||
6828a471 JM |
24 | #include <trace/events/thermal.h> |
25 | ||
07d888d8 VK |
26 | /* |
27 | * Cooling state <-> CPUFreq frequency | |
28 | * | |
29 | * Cooling states are translated to frequencies throughout this driver and this | |
30 | * is the relation between them. | |
31 | * | |
32 | * Highest cooling state corresponds to lowest possible frequency. | |
33 | * | |
34 | * i.e. | |
35 | * level 0 --> 1st Max Freq | |
36 | * level 1 --> 2nd Max Freq | |
37 | * ... | |
38 | */ | |
39 | ||
c36cf071 | 40 | /** |
349d39dc | 41 | * struct freq_table - frequency table along with power entries |
c36cf071 JM |
42 | * @frequency: frequency in KHz |
43 | * @power: power in mW | |
44 | * | |
45 | * This structure is built when the cooling device registers and helps | |
349d39dc | 46 | * in translating frequency to power and vice versa. |
c36cf071 | 47 | */ |
349d39dc | 48 | struct freq_table { |
c36cf071 JM |
49 | u32 frequency; |
50 | u32 power; | |
51 | }; | |
52 | ||
81ee14da VK |
53 | /** |
54 | * struct time_in_idle - Idle time stats | |
55 | * @time: previous reading of the absolute time that this cpu was idle | |
56 | * @timestamp: wall time of the last invocation of get_cpu_idle_time_us() | |
57 | */ | |
58 | struct time_in_idle { | |
59 | u64 time; | |
60 | u64 timestamp; | |
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. | |
d72b4015 | 67 | * @last_load: load measured by the latest call to cpufreq_get_requested_power() |
02361418 ADK |
68 | * @cpufreq_state: integer value representing the current state of cpufreq |
69 | * cooling devices. | |
dcc6c7fd VK |
70 | * @max_level: maximum cooling level. One less than total number of valid |
71 | * cpufreq frequencies. | |
d72b4015 VK |
72 | * @freq_table: Freq table in descending order of frequencies |
73 | * @cdev: thermal_cooling_device pointer to keep track of the | |
74 | * registered cooling device. | |
75 | * @policy: cpufreq policy. | |
fc4de356 | 76 | * @node: list_head to link all cpufreq_cooling_device together. |
81ee14da | 77 | * @idle_time: idle time stats |
02361418 | 78 | * |
beca6053 VK |
79 | * This structure is required for keeping information of each registered |
80 | * cpufreq_cooling_device. | |
02361418 ADK |
81 | */ |
82 | struct cpufreq_cooling_device { | |
83 | int id; | |
d72b4015 | 84 | u32 last_load; |
02361418 | 85 | unsigned int cpufreq_state; |
dcc6c7fd | 86 | unsigned int max_level; |
349d39dc | 87 | struct freq_table *freq_table; /* In descending order */ |
d72b4015 | 88 | struct cpufreq_policy *policy; |
2dcd851f | 89 | struct list_head node; |
81ee14da | 90 | struct time_in_idle *idle_time; |
5130802d | 91 | struct dev_pm_qos_request qos_req; |
02361418 | 92 | }; |
02361418 | 93 | |
fb8ea308 | 94 | static DEFINE_IDA(cpufreq_ida); |
02373d7c | 95 | static DEFINE_MUTEX(cooling_list_lock); |
1dea432a | 96 | static LIST_HEAD(cpufreq_cdev_list); |
02361418 | 97 | |
02361418 ADK |
98 | /* Below code defines functions to be used for cpufreq as cooling device */ |
99 | ||
100 | /** | |
4843c4a1 | 101 | * get_level: Find the level for a particular frequency |
1dea432a | 102 | * @cpufreq_cdev: cpufreq_cdev for which the property is required |
4843c4a1 | 103 | * @freq: Frequency |
82b9ee40 | 104 | * |
da27f69d | 105 | * Return: level corresponding to the frequency. |
02361418 | 106 | */ |
1dea432a | 107 | static unsigned long get_level(struct cpufreq_cooling_device *cpufreq_cdev, |
4843c4a1 | 108 | unsigned int freq) |
02361418 | 109 | { |
da27f69d | 110 | struct freq_table *freq_table = cpufreq_cdev->freq_table; |
4843c4a1 | 111 | unsigned long level; |
a116776f | 112 | |
da27f69d VK |
113 | for (level = 1; level <= cpufreq_cdev->max_level; level++) |
114 | if (freq > freq_table[level].frequency) | |
4843c4a1 | 115 | break; |
02361418 | 116 | |
da27f69d | 117 | return level - 1; |
fc35b35c ZR |
118 | } |
119 | ||
c36cf071 | 120 | /** |
349d39dc VK |
121 | * update_freq_table() - Update the freq table with power numbers |
122 | * @cpufreq_cdev: the cpufreq cooling device in which to update the table | |
c36cf071 JM |
123 | * @capacitance: dynamic power coefficient for these cpus |
124 | * | |
349d39dc VK |
125 | * Update the freq table with power numbers. This table will be used in |
126 | * cpu_power_to_freq() and cpu_freq_to_power() to convert between power and | |
127 | * frequency efficiently. Power is stored in mW, frequency in KHz. The | |
128 | * resulting table is in descending order. | |
c36cf071 | 129 | * |
459ac375 | 130 | * Return: 0 on success, -EINVAL if there are no OPPs for any CPUs, |
349d39dc | 131 | * or -ENOMEM if we run out of memory. |
c36cf071 | 132 | */ |
349d39dc VK |
133 | static int update_freq_table(struct cpufreq_cooling_device *cpufreq_cdev, |
134 | u32 capacitance) | |
c36cf071 | 135 | { |
349d39dc | 136 | struct freq_table *freq_table = cpufreq_cdev->freq_table; |
c36cf071 JM |
137 | struct dev_pm_opp *opp; |
138 | struct device *dev = NULL; | |
349d39dc | 139 | int num_opps = 0, cpu = cpufreq_cdev->policy->cpu, i; |
c36cf071 | 140 | |
02bacb21 VK |
141 | dev = get_cpu_device(cpu); |
142 | if (unlikely(!dev)) { | |
72554a75 | 143 | pr_warn("No cpu device for cpu %d\n", cpu); |
02bacb21 | 144 | return -ENODEV; |
c36cf071 | 145 | } |
02361418 | 146 | |
02bacb21 VK |
147 | num_opps = dev_pm_opp_get_opp_count(dev); |
148 | if (num_opps < 0) | |
149 | return num_opps; | |
150 | ||
349d39dc VK |
151 | /* |
152 | * The cpufreq table is also built from the OPP table and so the count | |
153 | * should match. | |
154 | */ | |
155 | if (num_opps != cpufreq_cdev->max_level + 1) { | |
156 | dev_warn(dev, "Number of OPPs not matching with max_levels\n"); | |
459ac375 | 157 | return -EINVAL; |
349d39dc | 158 | } |
02361418 | 159 | |
349d39dc VK |
160 | for (i = 0; i <= cpufreq_cdev->max_level; i++) { |
161 | unsigned long freq = freq_table[i].frequency * 1000; | |
162 | u32 freq_mhz = freq_table[i].frequency / 1000; | |
c36cf071 | 163 | u64 power; |
349d39dc | 164 | u32 voltage_mv; |
c36cf071 | 165 | |
349d39dc VK |
166 | /* |
167 | * Find ceil frequency as 'freq' may be slightly lower than OPP | |
168 | * freq due to truncation while converting to kHz. | |
169 | */ | |
170 | opp = dev_pm_opp_find_freq_ceil(dev, &freq); | |
171 | if (IS_ERR(opp)) { | |
172 | dev_err(dev, "failed to get opp for %lu frequency\n", | |
173 | freq); | |
174 | return -EINVAL; | |
459ac375 JM |
175 | } |
176 | ||
c36cf071 | 177 | voltage_mv = dev_pm_opp_get_voltage(opp) / 1000; |
8a31d9d9 | 178 | dev_pm_opp_put(opp); |
c36cf071 JM |
179 | |
180 | /* | |
181 | * Do the multiplication with MHz and millivolt so as | |
182 | * to not overflow. | |
183 | */ | |
184 | power = (u64)capacitance * freq_mhz * voltage_mv * voltage_mv; | |
185 | do_div(power, 1000000000); | |
186 | ||
c36cf071 | 187 | /* power is stored in mW */ |
349d39dc | 188 | freq_table[i].power = power; |
eba4f88d | 189 | } |
c36cf071 | 190 | |
459ac375 | 191 | return 0; |
c36cf071 JM |
192 | } |
193 | ||
1dea432a | 194 | static u32 cpu_freq_to_power(struct cpufreq_cooling_device *cpufreq_cdev, |
c36cf071 JM |
195 | u32 freq) |
196 | { | |
197 | int i; | |
349d39dc | 198 | struct freq_table *freq_table = cpufreq_cdev->freq_table; |
c36cf071 | 199 | |
349d39dc VK |
200 | for (i = 1; i <= cpufreq_cdev->max_level; i++) |
201 | if (freq > freq_table[i].frequency) | |
c36cf071 JM |
202 | break; |
203 | ||
349d39dc | 204 | return freq_table[i - 1].power; |
c36cf071 JM |
205 | } |
206 | ||
1dea432a | 207 | static u32 cpu_power_to_freq(struct cpufreq_cooling_device *cpufreq_cdev, |
c36cf071 JM |
208 | u32 power) |
209 | { | |
210 | int i; | |
349d39dc | 211 | struct freq_table *freq_table = cpufreq_cdev->freq_table; |
c36cf071 | 212 | |
349d39dc VK |
213 | for (i = 1; i <= cpufreq_cdev->max_level; i++) |
214 | if (power > freq_table[i].power) | |
c36cf071 JM |
215 | break; |
216 | ||
349d39dc | 217 | return freq_table[i - 1].frequency; |
c36cf071 JM |
218 | } |
219 | ||
220 | /** | |
221 | * get_load() - get load for a cpu since last updated | |
1dea432a | 222 | * @cpufreq_cdev: &struct cpufreq_cooling_device for this cpu |
c36cf071 | 223 | * @cpu: cpu number |
ba76dd9d | 224 | * @cpu_idx: index of the cpu in time_in_idle* |
c36cf071 JM |
225 | * |
226 | * Return: The average load of cpu @cpu in percentage since this | |
227 | * function was last called. | |
228 | */ | |
1dea432a | 229 | static u32 get_load(struct cpufreq_cooling_device *cpufreq_cdev, int cpu, |
a53b8394 | 230 | int cpu_idx) |
c36cf071 JM |
231 | { |
232 | u32 load; | |
233 | u64 now, now_idle, delta_time, delta_idle; | |
81ee14da | 234 | struct time_in_idle *idle_time = &cpufreq_cdev->idle_time[cpu_idx]; |
c36cf071 JM |
235 | |
236 | now_idle = get_cpu_idle_time(cpu, &now, 0); | |
81ee14da VK |
237 | delta_idle = now_idle - idle_time->time; |
238 | delta_time = now - idle_time->timestamp; | |
c36cf071 JM |
239 | |
240 | if (delta_time <= delta_idle) | |
241 | load = 0; | |
242 | else | |
243 | load = div64_u64(100 * (delta_time - delta_idle), delta_time); | |
244 | ||
81ee14da VK |
245 | idle_time->time = now_idle; |
246 | idle_time->timestamp = now; | |
c36cf071 JM |
247 | |
248 | return load; | |
249 | } | |
250 | ||
c36cf071 JM |
251 | /** |
252 | * get_dynamic_power() - calculate the dynamic power | |
1dea432a | 253 | * @cpufreq_cdev: &cpufreq_cooling_device for this cdev |
c36cf071 JM |
254 | * @freq: current frequency |
255 | * | |
256 | * Return: the dynamic power consumed by the cpus described by | |
1dea432a | 257 | * @cpufreq_cdev. |
c36cf071 | 258 | */ |
1dea432a | 259 | static u32 get_dynamic_power(struct cpufreq_cooling_device *cpufreq_cdev, |
c36cf071 JM |
260 | unsigned long freq) |
261 | { | |
262 | u32 raw_cpu_power; | |
263 | ||
1dea432a VK |
264 | raw_cpu_power = cpu_freq_to_power(cpufreq_cdev, freq); |
265 | return (raw_cpu_power * cpufreq_cdev->last_load) / 100; | |
02361418 ADK |
266 | } |
267 | ||
1b9e3526 | 268 | /* cpufreq cooling device callback functions are defined below */ |
02361418 ADK |
269 | |
270 | /** | |
271 | * cpufreq_get_max_state - callback function to get the max cooling state. | |
272 | * @cdev: thermal cooling device pointer. | |
273 | * @state: fill this variable with the max cooling state. | |
62c00421 EV |
274 | * |
275 | * Callback for the thermal cooling device to return the cpufreq | |
276 | * max cooling state. | |
277 | * | |
278 | * Return: 0 on success, an error code otherwise. | |
02361418 ADK |
279 | */ |
280 | static int cpufreq_get_max_state(struct thermal_cooling_device *cdev, | |
281 | unsigned long *state) | |
282 | { | |
1dea432a | 283 | struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata; |
9c51b05a | 284 | |
1dea432a | 285 | *state = cpufreq_cdev->max_level; |
dcc6c7fd | 286 | return 0; |
02361418 ADK |
287 | } |
288 | ||
289 | /** | |
290 | * cpufreq_get_cur_state - callback function to get the current cooling state. | |
291 | * @cdev: thermal cooling device pointer. | |
292 | * @state: fill this variable with the current cooling state. | |
3672552d EV |
293 | * |
294 | * Callback for the thermal cooling device to return the cpufreq | |
295 | * current cooling state. | |
296 | * | |
297 | * Return: 0 on success, an error code otherwise. | |
02361418 ADK |
298 | */ |
299 | static int cpufreq_get_cur_state(struct thermal_cooling_device *cdev, | |
300 | unsigned long *state) | |
301 | { | |
1dea432a | 302 | struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata; |
02361418 | 303 | |
1dea432a | 304 | *state = cpufreq_cdev->cpufreq_state; |
79491e53 | 305 | |
160b7d80 | 306 | return 0; |
02361418 ADK |
307 | } |
308 | ||
309 | /** | |
310 | * cpufreq_set_cur_state - callback function to set the current cooling state. | |
311 | * @cdev: thermal cooling device pointer. | |
312 | * @state: set this variable to the current cooling state. | |
56e05fdb EV |
313 | * |
314 | * Callback for the thermal cooling device to change the cpufreq | |
315 | * current cooling state. | |
316 | * | |
317 | * Return: 0 on success, an error code otherwise. | |
02361418 ADK |
318 | */ |
319 | static int cpufreq_set_cur_state(struct thermal_cooling_device *cdev, | |
320 | unsigned long state) | |
321 | { | |
1dea432a | 322 | struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata; |
4843c4a1 VK |
323 | |
324 | /* Request state should be less than max_level */ | |
1dea432a | 325 | if (WARN_ON(state > cpufreq_cdev->max_level)) |
4843c4a1 | 326 | return -EINVAL; |
5194fe46 VK |
327 | |
328 | /* Check if the old cooling action is same as new cooling action */ | |
1dea432a | 329 | if (cpufreq_cdev->cpufreq_state == state) |
5194fe46 | 330 | return 0; |
02361418 | 331 | |
1dea432a | 332 | cpufreq_cdev->cpufreq_state = state; |
5194fe46 | 333 | |
5130802d VK |
334 | return dev_pm_qos_update_request(&cpufreq_cdev->qos_req, |
335 | cpufreq_cdev->freq_table[state].frequency); | |
02361418 ADK |
336 | } |
337 | ||
c36cf071 JM |
338 | /** |
339 | * cpufreq_get_requested_power() - get the current power | |
340 | * @cdev: &thermal_cooling_device pointer | |
341 | * @tz: a valid thermal zone device pointer | |
342 | * @power: pointer in which to store the resulting power | |
343 | * | |
344 | * Calculate the current power consumption of the cpus in milliwatts | |
345 | * and store it in @power. This function should actually calculate | |
346 | * the requested power, but it's hard to get the frequency that | |
347 | * cpufreq would have assigned if there were no thermal limits. | |
348 | * Instead, we calculate the current power on the assumption that the | |
349 | * immediate future will look like the immediate past. | |
350 | * | |
351 | * We use the current frequency and the average load since this | |
352 | * function was last called. In reality, there could have been | |
353 | * multiple opps since this function was last called and that affects | |
354 | * the load calculation. While it's not perfectly accurate, this | |
355 | * simplification is good enough and works. REVISIT this, as more | |
356 | * complex code may be needed if experiments show that it's not | |
357 | * accurate enough. | |
358 | * | |
359 | * Return: 0 on success, -E* if getting the static power failed. | |
360 | */ | |
361 | static int cpufreq_get_requested_power(struct thermal_cooling_device *cdev, | |
362 | struct thermal_zone_device *tz, | |
363 | u32 *power) | |
364 | { | |
365 | unsigned long freq; | |
84fe2cab VK |
366 | int i = 0, cpu; |
367 | u32 total_load = 0; | |
1dea432a | 368 | struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata; |
ba76dd9d | 369 | struct cpufreq_policy *policy = cpufreq_cdev->policy; |
6828a471 | 370 | u32 *load_cpu = NULL; |
c36cf071 | 371 | |
ba76dd9d | 372 | freq = cpufreq_quick_get(policy->cpu); |
c36cf071 | 373 | |
6828a471 | 374 | if (trace_thermal_power_cpu_get_power_enabled()) { |
ba76dd9d | 375 | u32 ncpus = cpumask_weight(policy->related_cpus); |
6828a471 | 376 | |
a71544cd | 377 | load_cpu = kcalloc(ncpus, sizeof(*load_cpu), GFP_KERNEL); |
6828a471 JM |
378 | } |
379 | ||
ba76dd9d | 380 | for_each_cpu(cpu, policy->related_cpus) { |
c36cf071 JM |
381 | u32 load; |
382 | ||
383 | if (cpu_online(cpu)) | |
1dea432a | 384 | load = get_load(cpufreq_cdev, cpu, i); |
c36cf071 JM |
385 | else |
386 | load = 0; | |
387 | ||
388 | total_load += load; | |
bf45ac18 | 389 | if (load_cpu) |
6828a471 JM |
390 | load_cpu[i] = load; |
391 | ||
392 | i++; | |
c36cf071 JM |
393 | } |
394 | ||
1dea432a | 395 | cpufreq_cdev->last_load = total_load; |
c36cf071 | 396 | |
84fe2cab | 397 | *power = get_dynamic_power(cpufreq_cdev, freq); |
6828a471 JM |
398 | |
399 | if (load_cpu) { | |
ba76dd9d | 400 | trace_thermal_power_cpu_get_power(policy->related_cpus, freq, |
84fe2cab | 401 | load_cpu, i, *power); |
6828a471 | 402 | |
a71544cd | 403 | kfree(load_cpu); |
6828a471 | 404 | } |
c36cf071 | 405 | |
c36cf071 JM |
406 | return 0; |
407 | } | |
408 | ||
409 | /** | |
410 | * cpufreq_state2power() - convert a cpu cdev state to power consumed | |
411 | * @cdev: &thermal_cooling_device pointer | |
412 | * @tz: a valid thermal zone device pointer | |
413 | * @state: cooling device state to be converted | |
414 | * @power: pointer in which to store the resulting power | |
415 | * | |
416 | * Convert cooling device state @state into power consumption in | |
417 | * milliwatts assuming 100% load. Store the calculated power in | |
418 | * @power. | |
419 | * | |
420 | * Return: 0 on success, -EINVAL if the cooling device state could not | |
421 | * be converted into a frequency or other -E* if there was an error | |
422 | * when calculating the static power. | |
423 | */ | |
424 | static int cpufreq_state2power(struct thermal_cooling_device *cdev, | |
425 | struct thermal_zone_device *tz, | |
426 | unsigned long state, u32 *power) | |
427 | { | |
428 | unsigned int freq, num_cpus; | |
1dea432a | 429 | struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata; |
c36cf071 | 430 | |
cb1b6318 VK |
431 | /* Request state should be less than max_level */ |
432 | if (WARN_ON(state > cpufreq_cdev->max_level)) | |
433 | return -EINVAL; | |
434 | ||
ba76dd9d | 435 | num_cpus = cpumask_weight(cpufreq_cdev->policy->cpus); |
c36cf071 | 436 | |
349d39dc | 437 | freq = cpufreq_cdev->freq_table[state].frequency; |
84fe2cab | 438 | *power = cpu_freq_to_power(cpufreq_cdev, freq) * num_cpus; |
c36cf071 | 439 | |
84fe2cab | 440 | return 0; |
c36cf071 JM |
441 | } |
442 | ||
443 | /** | |
444 | * cpufreq_power2state() - convert power to a cooling device state | |
445 | * @cdev: &thermal_cooling_device pointer | |
446 | * @tz: a valid thermal zone device pointer | |
447 | * @power: power in milliwatts to be converted | |
448 | * @state: pointer in which to store the resulting state | |
449 | * | |
450 | * Calculate a cooling device state for the cpus described by @cdev | |
451 | * that would allow them to consume at most @power mW and store it in | |
452 | * @state. Note that this calculation depends on external factors | |
453 | * such as the cpu load or the current static power. Calling this | |
454 | * function with the same power as input can yield different cooling | |
455 | * device states depending on those external factors. | |
456 | * | |
457 | * Return: 0 on success, -ENODEV if no cpus are online or -EINVAL if | |
458 | * the calculated frequency could not be converted to a valid state. | |
459 | * The latter should not happen unless the frequencies available to | |
460 | * cpufreq have changed since the initialization of the cpu cooling | |
461 | * device. | |
462 | */ | |
463 | static int cpufreq_power2state(struct thermal_cooling_device *cdev, | |
464 | struct thermal_zone_device *tz, u32 power, | |
465 | unsigned long *state) | |
466 | { | |
e0fda737 | 467 | unsigned int target_freq; |
84fe2cab | 468 | u32 last_load, normalised_power; |
1dea432a | 469 | struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata; |
ba76dd9d | 470 | struct cpufreq_policy *policy = cpufreq_cdev->policy; |
c36cf071 | 471 | |
1dea432a | 472 | last_load = cpufreq_cdev->last_load ?: 1; |
84fe2cab | 473 | normalised_power = (power * 100) / last_load; |
1dea432a | 474 | target_freq = cpu_power_to_freq(cpufreq_cdev, normalised_power); |
c36cf071 | 475 | |
3e08b2df | 476 | *state = get_level(cpufreq_cdev, target_freq); |
ba76dd9d VK |
477 | trace_thermal_power_cpu_limit(policy->related_cpus, target_freq, *state, |
478 | power); | |
c36cf071 JM |
479 | return 0; |
480 | } | |
481 | ||
02361418 | 482 | /* Bind cpufreq callbacks to thermal cooling device ops */ |
a305a438 | 483 | |
c36cf071 | 484 | static struct thermal_cooling_device_ops cpufreq_cooling_ops = { |
02361418 ADK |
485 | .get_max_state = cpufreq_get_max_state, |
486 | .get_cur_state = cpufreq_get_cur_state, | |
487 | .set_cur_state = cpufreq_set_cur_state, | |
488 | }; | |
489 | ||
a305a438 BJ |
490 | static struct thermal_cooling_device_ops cpufreq_power_cooling_ops = { |
491 | .get_max_state = cpufreq_get_max_state, | |
492 | .get_cur_state = cpufreq_get_cur_state, | |
493 | .set_cur_state = cpufreq_set_cur_state, | |
494 | .get_requested_power = cpufreq_get_requested_power, | |
495 | .state2power = cpufreq_state2power, | |
496 | .power2state = cpufreq_power2state, | |
497 | }; | |
498 | ||
f6859014 VK |
499 | static unsigned int find_next_max(struct cpufreq_frequency_table *table, |
500 | unsigned int prev_max) | |
501 | { | |
502 | struct cpufreq_frequency_table *pos; | |
503 | unsigned int max = 0; | |
504 | ||
505 | cpufreq_for_each_valid_entry(pos, table) { | |
506 | if (pos->frequency > max && pos->frequency < prev_max) | |
507 | max = pos->frequency; | |
508 | } | |
509 | ||
510 | return max; | |
511 | } | |
512 | ||
02361418 | 513 | /** |
39d99cff EV |
514 | * __cpufreq_cooling_register - helper function to create cpufreq cooling device |
515 | * @np: a valid struct device_node to the cooling device device tree node | |
4d753aa7 | 516 | * @policy: cpufreq policy |
405fb825 | 517 | * Normally this should be same as cpufreq policy->related_cpus. |
c36cf071 | 518 | * @capacitance: dynamic power coefficient for these cpus |
12cb08ba EV |
519 | * |
520 | * This interface function registers the cpufreq cooling device with the name | |
521 | * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq | |
39d99cff EV |
522 | * cooling devices. It also gives the opportunity to link the cooling device |
523 | * with a device tree node, in order to bind it via the thermal DT code. | |
12cb08ba EV |
524 | * |
525 | * Return: a valid struct thermal_cooling_device pointer on success, | |
526 | * on failure, it returns a corresponding ERR_PTR(). | |
02361418 | 527 | */ |
39d99cff EV |
528 | static struct thermal_cooling_device * |
529 | __cpufreq_cooling_register(struct device_node *np, | |
84fe2cab | 530 | struct cpufreq_policy *policy, u32 capacitance) |
02361418 | 531 | { |
04bdbdf9 | 532 | struct thermal_cooling_device *cdev; |
1dea432a | 533 | struct cpufreq_cooling_device *cpufreq_cdev; |
02361418 | 534 | char dev_name[THERMAL_NAME_LENGTH]; |
c36cf071 | 535 | unsigned int freq, i, num_cpus; |
5130802d | 536 | struct device *dev; |
405fb825 | 537 | int ret; |
a305a438 | 538 | struct thermal_cooling_device_ops *cooling_ops; |
5130802d VK |
539 | |
540 | dev = get_cpu_device(policy->cpu); | |
541 | if (unlikely(!dev)) { | |
542 | pr_warn("No cpu device for cpu %d\n", policy->cpu); | |
543 | return ERR_PTR(-ENODEV); | |
544 | } | |
545 | ||
02361418 | 546 | |
4d753aa7 | 547 | if (IS_ERR_OR_NULL(policy)) { |
b2fd708f | 548 | pr_err("%s: cpufreq policy isn't valid: %p\n", __func__, policy); |
4d753aa7 | 549 | return ERR_PTR(-EINVAL); |
f8bfc116 VK |
550 | } |
551 | ||
55d85293 VK |
552 | i = cpufreq_table_count_valid_entries(policy); |
553 | if (!i) { | |
554 | pr_debug("%s: CPUFreq table not found or has no valid entries\n", | |
555 | __func__); | |
4d753aa7 | 556 | return ERR_PTR(-ENODEV); |
02361418 | 557 | } |
0f1be51c | 558 | |
1dea432a | 559 | cpufreq_cdev = kzalloc(sizeof(*cpufreq_cdev), GFP_KERNEL); |
4d753aa7 VK |
560 | if (!cpufreq_cdev) |
561 | return ERR_PTR(-ENOMEM); | |
02361418 | 562 | |
b12b6519 | 563 | cpufreq_cdev->policy = policy; |
4d753aa7 | 564 | num_cpus = cpumask_weight(policy->related_cpus); |
81ee14da VK |
565 | cpufreq_cdev->idle_time = kcalloc(num_cpus, |
566 | sizeof(*cpufreq_cdev->idle_time), | |
567 | GFP_KERNEL); | |
568 | if (!cpufreq_cdev->idle_time) { | |
04bdbdf9 | 569 | cdev = ERR_PTR(-ENOMEM); |
c36cf071 JM |
570 | goto free_cdev; |
571 | } | |
572 | ||
55d85293 VK |
573 | /* max_level is an index, not a counter */ |
574 | cpufreq_cdev->max_level = i - 1; | |
dcc6c7fd | 575 | |
f19b1a17 VK |
576 | cpufreq_cdev->freq_table = kmalloc_array(i, |
577 | sizeof(*cpufreq_cdev->freq_table), | |
578 | GFP_KERNEL); | |
1dea432a | 579 | if (!cpufreq_cdev->freq_table) { |
04bdbdf9 | 580 | cdev = ERR_PTR(-ENOMEM); |
81ee14da | 581 | goto free_idle_time; |
f6859014 VK |
582 | } |
583 | ||
ae606089 MW |
584 | ret = ida_simple_get(&cpufreq_ida, 0, 0, GFP_KERNEL); |
585 | if (ret < 0) { | |
04bdbdf9 | 586 | cdev = ERR_PTR(ret); |
349d39dc | 587 | goto free_table; |
02361418 | 588 | } |
1dea432a | 589 | cpufreq_cdev->id = ret; |
02361418 | 590 | |
349d39dc VK |
591 | snprintf(dev_name, sizeof(dev_name), "thermal-cpufreq-%d", |
592 | cpufreq_cdev->id); | |
593 | ||
f6859014 | 594 | /* Fill freq-table in descending order of frequencies */ |
1dea432a | 595 | for (i = 0, freq = -1; i <= cpufreq_cdev->max_level; i++) { |
55d85293 | 596 | freq = find_next_max(policy->freq_table, freq); |
349d39dc | 597 | cpufreq_cdev->freq_table[i].frequency = freq; |
f6859014 VK |
598 | |
599 | /* Warn for duplicate entries */ | |
600 | if (!freq) | |
601 | pr_warn("%s: table has duplicate entries\n", __func__); | |
602 | else | |
603 | pr_debug("%s: freq:%u KHz\n", __func__, freq); | |
02361418 | 604 | } |
f6859014 | 605 | |
349d39dc | 606 | if (capacitance) { |
349d39dc VK |
607 | ret = update_freq_table(cpufreq_cdev, capacitance); |
608 | if (ret) { | |
609 | cdev = ERR_PTR(ret); | |
610 | goto remove_ida; | |
611 | } | |
612 | ||
613 | cooling_ops = &cpufreq_power_cooling_ops; | |
614 | } else { | |
615 | cooling_ops = &cpufreq_cooling_ops; | |
616 | } | |
f840ab18 | 617 | |
5130802d VK |
618 | ret = dev_pm_qos_add_request(dev, &cpufreq_cdev->qos_req, |
619 | DEV_PM_QOS_MAX_FREQUENCY, | |
620 | cpufreq_cdev->freq_table[0].frequency); | |
621 | if (ret < 0) { | |
622 | pr_err("%s: Failed to add freq constraint (%d)\n", __func__, | |
623 | ret); | |
624 | cdev = ERR_PTR(ret); | |
625 | goto remove_ida; | |
626 | } | |
627 | ||
04bdbdf9 VK |
628 | cdev = thermal_of_cooling_device_register(np, dev_name, cpufreq_cdev, |
629 | cooling_ops); | |
630 | if (IS_ERR(cdev)) | |
5130802d | 631 | goto remove_qos_req; |
92e615ec | 632 | |
02373d7c | 633 | mutex_lock(&cooling_list_lock); |
1dea432a | 634 | list_add(&cpufreq_cdev->node, &cpufreq_cdev_list); |
088db931 | 635 | mutex_unlock(&cooling_list_lock); |
02373d7c | 636 | |
4d753aa7 | 637 | return cdev; |
730abe06 | 638 | |
5130802d VK |
639 | remove_qos_req: |
640 | dev_pm_qos_remove_request(&cpufreq_cdev->qos_req); | |
ae606089 | 641 | remove_ida: |
1dea432a | 642 | ida_simple_remove(&cpufreq_ida, cpufreq_cdev->id); |
f6859014 | 643 | free_table: |
1dea432a | 644 | kfree(cpufreq_cdev->freq_table); |
81ee14da VK |
645 | free_idle_time: |
646 | kfree(cpufreq_cdev->idle_time); | |
730abe06 | 647 | free_cdev: |
1dea432a | 648 | kfree(cpufreq_cdev); |
04bdbdf9 | 649 | return cdev; |
02361418 | 650 | } |
39d99cff EV |
651 | |
652 | /** | |
653 | * cpufreq_cooling_register - function to create cpufreq cooling device. | |
4d753aa7 | 654 | * @policy: cpufreq policy |
39d99cff EV |
655 | * |
656 | * This interface function registers the cpufreq cooling device with the name | |
657 | * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq | |
658 | * cooling devices. | |
659 | * | |
660 | * Return: a valid struct thermal_cooling_device pointer on success, | |
661 | * on failure, it returns a corresponding ERR_PTR(). | |
662 | */ | |
663 | struct thermal_cooling_device * | |
4d753aa7 | 664 | cpufreq_cooling_register(struct cpufreq_policy *policy) |
39d99cff | 665 | { |
84fe2cab | 666 | return __cpufreq_cooling_register(NULL, policy, 0); |
39d99cff | 667 | } |
243dbd9c | 668 | EXPORT_SYMBOL_GPL(cpufreq_cooling_register); |
02361418 | 669 | |
39d99cff EV |
670 | /** |
671 | * of_cpufreq_cooling_register - function to create cpufreq cooling device. | |
4d753aa7 | 672 | * @policy: cpufreq policy |
39d99cff EV |
673 | * |
674 | * This interface function registers the cpufreq cooling device with the name | |
675 | * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq | |
676 | * cooling devices. Using this API, the cpufreq cooling device will be | |
677 | * linked to the device tree node provided. | |
678 | * | |
c36cf071 JM |
679 | * Using this function, the cooling device will implement the power |
680 | * extensions by using a simple cpu power model. The cpus must have | |
681 | * registered their OPPs using the OPP library. | |
682 | * | |
f5f263fe VK |
683 | * It also takes into account, if property present in policy CPU node, the |
684 | * static power consumed by the cpu. | |
c36cf071 JM |
685 | * |
686 | * Return: a valid struct thermal_cooling_device pointer on success, | |
f5f263fe | 687 | * and NULL on failure. |
c36cf071 JM |
688 | */ |
689 | struct thermal_cooling_device * | |
3ebb62ff | 690 | of_cpufreq_cooling_register(struct cpufreq_policy *policy) |
c36cf071 | 691 | { |
f5f263fe VK |
692 | struct device_node *np = of_get_cpu_node(policy->cpu, NULL); |
693 | struct thermal_cooling_device *cdev = NULL; | |
694 | u32 capacitance = 0; | |
695 | ||
696 | if (!np) { | |
697 | pr_err("cpu_cooling: OF node not available for cpu%d\n", | |
698 | policy->cpu); | |
699 | return NULL; | |
700 | } | |
c36cf071 | 701 | |
f5f263fe VK |
702 | if (of_find_property(np, "#cooling-cells", NULL)) { |
703 | of_property_read_u32(np, "dynamic-power-coefficient", | |
704 | &capacitance); | |
705 | ||
84fe2cab | 706 | cdev = __cpufreq_cooling_register(np, policy, capacitance); |
f5f263fe | 707 | if (IS_ERR(cdev)) { |
bf78f133 | 708 | pr_err("cpu_cooling: cpu%d failed to register as cooling device: %ld\n", |
f5f263fe VK |
709 | policy->cpu, PTR_ERR(cdev)); |
710 | cdev = NULL; | |
711 | } | |
712 | } | |
713 | ||
714 | of_node_put(np); | |
715 | return cdev; | |
c36cf071 | 716 | } |
3ebb62ff | 717 | EXPORT_SYMBOL_GPL(of_cpufreq_cooling_register); |
c36cf071 | 718 | |
02361418 ADK |
719 | /** |
720 | * cpufreq_cooling_unregister - function to remove cpufreq cooling device. | |
721 | * @cdev: thermal cooling device pointer. | |
135266b4 EV |
722 | * |
723 | * This interface function unregisters the "thermal-cpufreq-%x" cooling device. | |
02361418 ADK |
724 | */ |
725 | void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev) | |
726 | { | |
1dea432a | 727 | struct cpufreq_cooling_device *cpufreq_cdev; |
02361418 | 728 | |
50e66c7e EV |
729 | if (!cdev) |
730 | return; | |
731 | ||
1dea432a | 732 | cpufreq_cdev = cdev->devdata; |
02361418 | 733 | |
ae606089 | 734 | mutex_lock(&cooling_list_lock); |
1dea432a | 735 | list_del(&cpufreq_cdev->node); |
088db931 MW |
736 | mutex_unlock(&cooling_list_lock); |
737 | ||
72554a75 | 738 | thermal_cooling_device_unregister(cdev); |
5130802d | 739 | dev_pm_qos_remove_request(&cpufreq_cdev->qos_req); |
1dea432a | 740 | ida_simple_remove(&cpufreq_ida, cpufreq_cdev->id); |
81ee14da | 741 | kfree(cpufreq_cdev->idle_time); |
1dea432a VK |
742 | kfree(cpufreq_cdev->freq_table); |
743 | kfree(cpufreq_cdev); | |
02361418 | 744 | } |
243dbd9c | 745 | EXPORT_SYMBOL_GPL(cpufreq_cooling_unregister); |