1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/drivers/thermal/cpufreq_cooling.c 4 * 5 * Copyright (C) 2012 Samsung Electronics Co., Ltd(http://www.samsung.com) 6 * 7 * Copyright (C) 2012-2018 Linaro Limited. 8 * 9 * Authors: Amit Daniel <amit.kachhap@linaro.org> 10 * Viresh Kumar <viresh.kumar@linaro.org> 11 * 12 */ 13 #include <linux/cpu.h> 14 #include <linux/cpufreq.h> 15 #include <linux/cpu_cooling.h> 16 #include <linux/device.h> 17 #include <linux/energy_model.h> 18 #include <linux/err.h> 19 #include <linux/export.h> 20 #include <linux/pm_opp.h> 21 #include <linux/pm_qos.h> 22 #include <linux/slab.h> 23 #include <linux/thermal.h> 24 25 #include <trace/events/thermal.h> 26 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 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 51 /** 52 * struct cpufreq_cooling_device - data for cooling device with cpufreq 53 * @last_load: load measured by the latest call to cpufreq_get_requested_power() 54 * @cpufreq_state: integer value representing the current state of cpufreq 55 * cooling devices. 56 * @max_level: maximum cooling level. One less than total number of valid 57 * cpufreq frequencies. 58 * @em: Reference on the Energy Model of the device 59 * @cdev: thermal_cooling_device pointer to keep track of the 60 * registered cooling device. 61 * @policy: cpufreq policy. 62 * @cooling_ops: cpufreq callbacks to thermal cooling device ops 63 * @idle_time: idle time stats 64 * @qos_req: PM QoS contraint to apply 65 * 66 * This structure is required for keeping information of each registered 67 * cpufreq_cooling_device. 68 */ 69 struct cpufreq_cooling_device { 70 u32 last_load; 71 unsigned int cpufreq_state; 72 unsigned int max_level; 73 struct em_perf_domain *em; 74 struct cpufreq_policy *policy; 75 struct thermal_cooling_device_ops cooling_ops; 76 #ifndef CONFIG_SMP 77 struct time_in_idle *idle_time; 78 #endif 79 struct freq_qos_request qos_req; 80 }; 81 82 #ifdef CONFIG_THERMAL_GOV_POWER_ALLOCATOR 83 /** 84 * get_level: Find the level for a particular frequency 85 * @cpufreq_cdev: cpufreq_cdev for which the property is required 86 * @freq: Frequency 87 * 88 * Return: level corresponding to the frequency. 89 */ 90 static unsigned long get_level(struct cpufreq_cooling_device *cpufreq_cdev, 91 unsigned int freq) 92 { 93 int i; 94 95 for (i = cpufreq_cdev->max_level - 1; i >= 0; i--) { 96 if (freq > cpufreq_cdev->em->table[i].frequency) 97 break; 98 } 99 100 return cpufreq_cdev->max_level - i - 1; 101 } 102 103 static u32 cpu_freq_to_power(struct cpufreq_cooling_device *cpufreq_cdev, 104 u32 freq) 105 { 106 int i; 107 108 for (i = cpufreq_cdev->max_level - 1; i >= 0; i--) { 109 if (freq > cpufreq_cdev->em->table[i].frequency) 110 break; 111 } 112 113 return cpufreq_cdev->em->table[i + 1].power; 114 } 115 116 static u32 cpu_power_to_freq(struct cpufreq_cooling_device *cpufreq_cdev, 117 u32 power) 118 { 119 int i; 120 121 for (i = cpufreq_cdev->max_level; i > 0; i--) { 122 if (power >= cpufreq_cdev->em->table[i].power) 123 break; 124 } 125 126 return cpufreq_cdev->em->table[i].frequency; 127 } 128 129 /** 130 * get_load() - get load for a cpu 131 * @cpufreq_cdev: struct cpufreq_cooling_device for the cpu 132 * @cpu: cpu number 133 * @cpu_idx: index of the cpu in time_in_idle array 134 * 135 * Return: The average load of cpu @cpu in percentage since this 136 * function was last called. 137 */ 138 #ifdef CONFIG_SMP 139 static u32 get_load(struct cpufreq_cooling_device *cpufreq_cdev, int cpu, 140 int cpu_idx) 141 { 142 unsigned long max = arch_scale_cpu_capacity(cpu); 143 unsigned long util; 144 145 util = sched_cpu_util(cpu, max); 146 return (util * 100) / max; 147 } 148 #else /* !CONFIG_SMP */ 149 static u32 get_load(struct cpufreq_cooling_device *cpufreq_cdev, int cpu, 150 int cpu_idx) 151 { 152 u32 load; 153 u64 now, now_idle, delta_time, delta_idle; 154 struct time_in_idle *idle_time = &cpufreq_cdev->idle_time[cpu_idx]; 155 156 now_idle = get_cpu_idle_time(cpu, &now, 0); 157 delta_idle = now_idle - idle_time->time; 158 delta_time = now - idle_time->timestamp; 159 160 if (delta_time <= delta_idle) 161 load = 0; 162 else 163 load = div64_u64(100 * (delta_time - delta_idle), delta_time); 164 165 idle_time->time = now_idle; 166 idle_time->timestamp = now; 167 168 return load; 169 } 170 #endif /* CONFIG_SMP */ 171 172 /** 173 * get_dynamic_power() - calculate the dynamic power 174 * @cpufreq_cdev: &cpufreq_cooling_device for this cdev 175 * @freq: current frequency 176 * 177 * Return: the dynamic power consumed by the cpus described by 178 * @cpufreq_cdev. 179 */ 180 static u32 get_dynamic_power(struct cpufreq_cooling_device *cpufreq_cdev, 181 unsigned long freq) 182 { 183 u32 raw_cpu_power; 184 185 raw_cpu_power = cpu_freq_to_power(cpufreq_cdev, freq); 186 return (raw_cpu_power * cpufreq_cdev->last_load) / 100; 187 } 188 189 /** 190 * cpufreq_get_requested_power() - get the current power 191 * @cdev: &thermal_cooling_device pointer 192 * @power: pointer in which to store the resulting power 193 * 194 * Calculate the current power consumption of the cpus in milliwatts 195 * and store it in @power. This function should actually calculate 196 * the requested power, but it's hard to get the frequency that 197 * cpufreq would have assigned if there were no thermal limits. 198 * Instead, we calculate the current power on the assumption that the 199 * immediate future will look like the immediate past. 200 * 201 * We use the current frequency and the average load since this 202 * function was last called. In reality, there could have been 203 * multiple opps since this function was last called and that affects 204 * the load calculation. While it's not perfectly accurate, this 205 * simplification is good enough and works. REVISIT this, as more 206 * complex code may be needed if experiments show that it's not 207 * accurate enough. 208 * 209 * Return: 0 on success, -E* if getting the static power failed. 210 */ 211 static int cpufreq_get_requested_power(struct thermal_cooling_device *cdev, 212 u32 *power) 213 { 214 unsigned long freq; 215 int i = 0, cpu; 216 u32 total_load = 0; 217 struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata; 218 struct cpufreq_policy *policy = cpufreq_cdev->policy; 219 u32 *load_cpu = NULL; 220 221 freq = cpufreq_quick_get(policy->cpu); 222 223 if (trace_thermal_power_cpu_get_power_enabled()) { 224 u32 ncpus = cpumask_weight(policy->related_cpus); 225 226 load_cpu = kcalloc(ncpus, sizeof(*load_cpu), GFP_KERNEL); 227 } 228 229 for_each_cpu(cpu, policy->related_cpus) { 230 u32 load; 231 232 if (cpu_online(cpu)) 233 load = get_load(cpufreq_cdev, cpu, i); 234 else 235 load = 0; 236 237 total_load += load; 238 if (load_cpu) 239 load_cpu[i] = load; 240 241 i++; 242 } 243 244 cpufreq_cdev->last_load = total_load; 245 246 *power = get_dynamic_power(cpufreq_cdev, freq); 247 248 if (load_cpu) { 249 trace_thermal_power_cpu_get_power(policy->related_cpus, freq, 250 load_cpu, i, *power); 251 252 kfree(load_cpu); 253 } 254 255 return 0; 256 } 257 258 /** 259 * cpufreq_state2power() - convert a cpu cdev state to power consumed 260 * @cdev: &thermal_cooling_device pointer 261 * @state: cooling device state to be converted 262 * @power: pointer in which to store the resulting power 263 * 264 * Convert cooling device state @state into power consumption in 265 * milliwatts assuming 100% load. Store the calculated power in 266 * @power. 267 * 268 * Return: 0 on success, -EINVAL if the cooling device state could not 269 * be converted into a frequency or other -E* if there was an error 270 * when calculating the static power. 271 */ 272 static int cpufreq_state2power(struct thermal_cooling_device *cdev, 273 unsigned long state, u32 *power) 274 { 275 unsigned int freq, num_cpus, idx; 276 struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata; 277 278 /* Request state should be less than max_level */ 279 if (state > cpufreq_cdev->max_level) 280 return -EINVAL; 281 282 num_cpus = cpumask_weight(cpufreq_cdev->policy->cpus); 283 284 idx = cpufreq_cdev->max_level - state; 285 freq = cpufreq_cdev->em->table[idx].frequency; 286 *power = cpu_freq_to_power(cpufreq_cdev, freq) * num_cpus; 287 288 return 0; 289 } 290 291 /** 292 * cpufreq_power2state() - convert power to a cooling device state 293 * @cdev: &thermal_cooling_device pointer 294 * @power: power in milliwatts to be converted 295 * @state: pointer in which to store the resulting state 296 * 297 * Calculate a cooling device state for the cpus described by @cdev 298 * that would allow them to consume at most @power mW and store it in 299 * @state. Note that this calculation depends on external factors 300 * such as the cpu load or the current static power. Calling this 301 * function with the same power as input can yield different cooling 302 * device states depending on those external factors. 303 * 304 * Return: 0 on success, -ENODEV if no cpus are online or -EINVAL if 305 * the calculated frequency could not be converted to a valid state. 306 * The latter should not happen unless the frequencies available to 307 * cpufreq have changed since the initialization of the cpu cooling 308 * device. 309 */ 310 static int cpufreq_power2state(struct thermal_cooling_device *cdev, 311 u32 power, unsigned long *state) 312 { 313 unsigned int target_freq; 314 u32 last_load, normalised_power; 315 struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata; 316 struct cpufreq_policy *policy = cpufreq_cdev->policy; 317 318 last_load = cpufreq_cdev->last_load ?: 1; 319 normalised_power = (power * 100) / last_load; 320 target_freq = cpu_power_to_freq(cpufreq_cdev, normalised_power); 321 322 *state = get_level(cpufreq_cdev, target_freq); 323 trace_thermal_power_cpu_limit(policy->related_cpus, target_freq, *state, 324 power); 325 return 0; 326 } 327 328 static inline bool em_is_sane(struct cpufreq_cooling_device *cpufreq_cdev, 329 struct em_perf_domain *em) { 330 struct cpufreq_policy *policy; 331 unsigned int nr_levels; 332 333 if (!em || em_is_artificial(em)) 334 return false; 335 336 policy = cpufreq_cdev->policy; 337 if (!cpumask_equal(policy->related_cpus, em_span_cpus(em))) { 338 pr_err("The span of pd %*pbl is misaligned with cpufreq policy %*pbl\n", 339 cpumask_pr_args(em_span_cpus(em)), 340 cpumask_pr_args(policy->related_cpus)); 341 return false; 342 } 343 344 nr_levels = cpufreq_cdev->max_level + 1; 345 if (em_pd_nr_perf_states(em) != nr_levels) { 346 pr_err("The number of performance states in pd %*pbl (%u) doesn't match the number of cooling levels (%u)\n", 347 cpumask_pr_args(em_span_cpus(em)), 348 em_pd_nr_perf_states(em), nr_levels); 349 return false; 350 } 351 352 return true; 353 } 354 #endif /* CONFIG_THERMAL_GOV_POWER_ALLOCATOR */ 355 356 #ifdef CONFIG_SMP 357 static inline int allocate_idle_time(struct cpufreq_cooling_device *cpufreq_cdev) 358 { 359 return 0; 360 } 361 362 static inline void free_idle_time(struct cpufreq_cooling_device *cpufreq_cdev) 363 { 364 } 365 #else 366 static int allocate_idle_time(struct cpufreq_cooling_device *cpufreq_cdev) 367 { 368 unsigned int num_cpus = cpumask_weight(cpufreq_cdev->policy->related_cpus); 369 370 cpufreq_cdev->idle_time = kcalloc(num_cpus, 371 sizeof(*cpufreq_cdev->idle_time), 372 GFP_KERNEL); 373 if (!cpufreq_cdev->idle_time) 374 return -ENOMEM; 375 376 return 0; 377 } 378 379 static void free_idle_time(struct cpufreq_cooling_device *cpufreq_cdev) 380 { 381 kfree(cpufreq_cdev->idle_time); 382 cpufreq_cdev->idle_time = NULL; 383 } 384 #endif /* CONFIG_SMP */ 385 386 static unsigned int get_state_freq(struct cpufreq_cooling_device *cpufreq_cdev, 387 unsigned long state) 388 { 389 struct cpufreq_policy *policy; 390 unsigned long idx; 391 392 #ifdef CONFIG_THERMAL_GOV_POWER_ALLOCATOR 393 /* Use the Energy Model table if available */ 394 if (cpufreq_cdev->em) { 395 idx = cpufreq_cdev->max_level - state; 396 return cpufreq_cdev->em->table[idx].frequency; 397 } 398 #endif 399 400 /* Otherwise, fallback on the CPUFreq table */ 401 policy = cpufreq_cdev->policy; 402 if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING) 403 idx = cpufreq_cdev->max_level - state; 404 else 405 idx = state; 406 407 return policy->freq_table[idx].frequency; 408 } 409 410 /* cpufreq cooling device callback functions are defined below */ 411 412 /** 413 * cpufreq_get_max_state - callback function to get the max cooling state. 414 * @cdev: thermal cooling device pointer. 415 * @state: fill this variable with the max cooling state. 416 * 417 * Callback for the thermal cooling device to return the cpufreq 418 * max cooling state. 419 * 420 * Return: 0 on success, an error code otherwise. 421 */ 422 static int cpufreq_get_max_state(struct thermal_cooling_device *cdev, 423 unsigned long *state) 424 { 425 struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata; 426 427 *state = cpufreq_cdev->max_level; 428 return 0; 429 } 430 431 /** 432 * cpufreq_get_cur_state - callback function to get the current cooling state. 433 * @cdev: thermal cooling device pointer. 434 * @state: fill this variable with the current cooling state. 435 * 436 * Callback for the thermal cooling device to return the cpufreq 437 * current cooling state. 438 * 439 * Return: 0 on success, an error code otherwise. 440 */ 441 static int cpufreq_get_cur_state(struct thermal_cooling_device *cdev, 442 unsigned long *state) 443 { 444 struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata; 445 446 *state = cpufreq_cdev->cpufreq_state; 447 448 return 0; 449 } 450 451 /** 452 * cpufreq_set_cur_state - callback function to set the current cooling state. 453 * @cdev: thermal cooling device pointer. 454 * @state: set this variable to the current cooling state. 455 * 456 * Callback for the thermal cooling device to change the cpufreq 457 * current cooling state. 458 * 459 * Return: 0 on success, an error code otherwise. 460 */ 461 static int cpufreq_set_cur_state(struct thermal_cooling_device *cdev, 462 unsigned long state) 463 { 464 struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata; 465 struct cpumask *cpus; 466 unsigned int frequency; 467 int ret; 468 469 /* Request state should be less than max_level */ 470 if (state > cpufreq_cdev->max_level) 471 return -EINVAL; 472 473 /* Check if the old cooling action is same as new cooling action */ 474 if (cpufreq_cdev->cpufreq_state == state) 475 return 0; 476 477 frequency = get_state_freq(cpufreq_cdev, state); 478 479 ret = freq_qos_update_request(&cpufreq_cdev->qos_req, frequency); 480 if (ret >= 0) { 481 cpufreq_cdev->cpufreq_state = state; 482 cpus = cpufreq_cdev->policy->related_cpus; 483 arch_update_thermal_pressure(cpus, frequency); 484 ret = 0; 485 } 486 487 return ret; 488 } 489 490 /** 491 * __cpufreq_cooling_register - helper function to create cpufreq cooling device 492 * @np: a valid struct device_node to the cooling device device tree node 493 * @policy: cpufreq policy 494 * Normally this should be same as cpufreq policy->related_cpus. 495 * @em: Energy Model of the cpufreq policy 496 * 497 * This interface function registers the cpufreq cooling device with the name 498 * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq 499 * cooling devices. It also gives the opportunity to link the cooling device 500 * with a device tree node, in order to bind it via the thermal DT code. 501 * 502 * Return: a valid struct thermal_cooling_device pointer on success, 503 * on failure, it returns a corresponding ERR_PTR(). 504 */ 505 static struct thermal_cooling_device * 506 __cpufreq_cooling_register(struct device_node *np, 507 struct cpufreq_policy *policy, 508 struct em_perf_domain *em) 509 { 510 struct thermal_cooling_device *cdev; 511 struct cpufreq_cooling_device *cpufreq_cdev; 512 unsigned int i; 513 struct device *dev; 514 int ret; 515 struct thermal_cooling_device_ops *cooling_ops; 516 char *name; 517 518 dev = get_cpu_device(policy->cpu); 519 if (unlikely(!dev)) { 520 pr_warn("No cpu device for cpu %d\n", policy->cpu); 521 return ERR_PTR(-ENODEV); 522 } 523 524 if (IS_ERR_OR_NULL(policy)) { 525 pr_err("%s: cpufreq policy isn't valid: %p\n", __func__, policy); 526 return ERR_PTR(-EINVAL); 527 } 528 529 i = cpufreq_table_count_valid_entries(policy); 530 if (!i) { 531 pr_debug("%s: CPUFreq table not found or has no valid entries\n", 532 __func__); 533 return ERR_PTR(-ENODEV); 534 } 535 536 cpufreq_cdev = kzalloc(sizeof(*cpufreq_cdev), GFP_KERNEL); 537 if (!cpufreq_cdev) 538 return ERR_PTR(-ENOMEM); 539 540 cpufreq_cdev->policy = policy; 541 542 ret = allocate_idle_time(cpufreq_cdev); 543 if (ret) { 544 cdev = ERR_PTR(ret); 545 goto free_cdev; 546 } 547 548 /* max_level is an index, not a counter */ 549 cpufreq_cdev->max_level = i - 1; 550 551 cooling_ops = &cpufreq_cdev->cooling_ops; 552 cooling_ops->get_max_state = cpufreq_get_max_state; 553 cooling_ops->get_cur_state = cpufreq_get_cur_state; 554 cooling_ops->set_cur_state = cpufreq_set_cur_state; 555 556 #ifdef CONFIG_THERMAL_GOV_POWER_ALLOCATOR 557 if (em_is_sane(cpufreq_cdev, em)) { 558 cpufreq_cdev->em = em; 559 cooling_ops->get_requested_power = cpufreq_get_requested_power; 560 cooling_ops->state2power = cpufreq_state2power; 561 cooling_ops->power2state = cpufreq_power2state; 562 } else 563 #endif 564 if (policy->freq_table_sorted == CPUFREQ_TABLE_UNSORTED) { 565 pr_err("%s: unsorted frequency tables are not supported\n", 566 __func__); 567 cdev = ERR_PTR(-EINVAL); 568 goto free_idle_time; 569 } 570 571 ret = freq_qos_add_request(&policy->constraints, 572 &cpufreq_cdev->qos_req, FREQ_QOS_MAX, 573 get_state_freq(cpufreq_cdev, 0)); 574 if (ret < 0) { 575 pr_err("%s: Failed to add freq constraint (%d)\n", __func__, 576 ret); 577 cdev = ERR_PTR(ret); 578 goto free_idle_time; 579 } 580 581 cdev = ERR_PTR(-ENOMEM); 582 name = kasprintf(GFP_KERNEL, "cpufreq-%s", dev_name(dev)); 583 if (!name) 584 goto remove_qos_req; 585 586 cdev = thermal_of_cooling_device_register(np, name, cpufreq_cdev, 587 cooling_ops); 588 kfree(name); 589 590 if (IS_ERR(cdev)) 591 goto remove_qos_req; 592 593 return cdev; 594 595 remove_qos_req: 596 freq_qos_remove_request(&cpufreq_cdev->qos_req); 597 free_idle_time: 598 free_idle_time(cpufreq_cdev); 599 free_cdev: 600 kfree(cpufreq_cdev); 601 return cdev; 602 } 603 604 /** 605 * cpufreq_cooling_register - function to create cpufreq cooling device. 606 * @policy: cpufreq policy 607 * 608 * This interface function registers the cpufreq cooling device with the name 609 * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq 610 * cooling devices. 611 * 612 * Return: a valid struct thermal_cooling_device pointer on success, 613 * on failure, it returns a corresponding ERR_PTR(). 614 */ 615 struct thermal_cooling_device * 616 cpufreq_cooling_register(struct cpufreq_policy *policy) 617 { 618 return __cpufreq_cooling_register(NULL, policy, NULL); 619 } 620 EXPORT_SYMBOL_GPL(cpufreq_cooling_register); 621 622 /** 623 * of_cpufreq_cooling_register - function to create cpufreq cooling device. 624 * @policy: cpufreq policy 625 * 626 * This interface function registers the cpufreq cooling device with the name 627 * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq 628 * cooling devices. Using this API, the cpufreq cooling device will be 629 * linked to the device tree node provided. 630 * 631 * Using this function, the cooling device will implement the power 632 * extensions by using a simple cpu power model. The cpus must have 633 * registered their OPPs using the OPP library. 634 * 635 * It also takes into account, if property present in policy CPU node, the 636 * static power consumed by the cpu. 637 * 638 * Return: a valid struct thermal_cooling_device pointer on success, 639 * and NULL on failure. 640 */ 641 struct thermal_cooling_device * 642 of_cpufreq_cooling_register(struct cpufreq_policy *policy) 643 { 644 struct device_node *np = of_get_cpu_node(policy->cpu, NULL); 645 struct thermal_cooling_device *cdev = NULL; 646 647 if (!np) { 648 pr_err("cpufreq_cooling: OF node not available for cpu%d\n", 649 policy->cpu); 650 return NULL; 651 } 652 653 if (of_find_property(np, "#cooling-cells", NULL)) { 654 struct em_perf_domain *em = em_cpu_get(policy->cpu); 655 656 cdev = __cpufreq_cooling_register(np, policy, em); 657 if (IS_ERR(cdev)) { 658 pr_err("cpufreq_cooling: cpu%d failed to register as cooling device: %ld\n", 659 policy->cpu, PTR_ERR(cdev)); 660 cdev = NULL; 661 } 662 } 663 664 of_node_put(np); 665 return cdev; 666 } 667 EXPORT_SYMBOL_GPL(of_cpufreq_cooling_register); 668 669 /** 670 * cpufreq_cooling_unregister - function to remove cpufreq cooling device. 671 * @cdev: thermal cooling device pointer. 672 * 673 * This interface function unregisters the "thermal-cpufreq-%x" cooling device. 674 */ 675 void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev) 676 { 677 struct cpufreq_cooling_device *cpufreq_cdev; 678 679 if (!cdev) 680 return; 681 682 cpufreq_cdev = cdev->devdata; 683 684 thermal_cooling_device_unregister(cdev); 685 freq_qos_remove_request(&cpufreq_cdev->qos_req); 686 free_idle_time(cpufreq_cdev); 687 kfree(cpufreq_cdev); 688 } 689 EXPORT_SYMBOL_GPL(cpufreq_cooling_unregister); 690