1 /* 2 * linux/include/linux/cpufreq.h 3 * 4 * Copyright (C) 2001 Russell King 5 * (C) 2002 - 2003 Dominik Brodowski <[email protected]> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11 #ifndef _LINUX_CPUFREQ_H 12 #define _LINUX_CPUFREQ_H 13 14 #include <linux/clk.h> 15 #include <linux/cpumask.h> 16 #include <linux/completion.h> 17 #include <linux/kobject.h> 18 #include <linux/notifier.h> 19 #include <linux/spinlock.h> 20 #include <linux/sysfs.h> 21 22 /********************************************************************* 23 * CPUFREQ INTERFACE * 24 *********************************************************************/ 25 /* 26 * Frequency values here are CPU kHz 27 * 28 * Maximum transition latency is in nanoseconds - if it's unknown, 29 * CPUFREQ_ETERNAL shall be used. 30 */ 31 32 #define CPUFREQ_ETERNAL (-1) 33 #define CPUFREQ_NAME_LEN 16 34 /* Print length for names. Extra 1 space for accommodating '\n' in prints */ 35 #define CPUFREQ_NAME_PLEN (CPUFREQ_NAME_LEN + 1) 36 37 struct cpufreq_governor; 38 39 enum cpufreq_table_sorting { 40 CPUFREQ_TABLE_UNSORTED, 41 CPUFREQ_TABLE_SORTED_ASCENDING, 42 CPUFREQ_TABLE_SORTED_DESCENDING 43 }; 44 45 struct cpufreq_freqs { 46 unsigned int cpu; /* cpu nr */ 47 unsigned int old; 48 unsigned int new; 49 u8 flags; /* flags of cpufreq_driver, see below. */ 50 }; 51 52 struct cpufreq_cpuinfo { 53 unsigned int max_freq; 54 unsigned int min_freq; 55 56 /* in 10^(-9) s = nanoseconds */ 57 unsigned int transition_latency; 58 }; 59 60 struct cpufreq_user_policy { 61 unsigned int min; /* in kHz */ 62 unsigned int max; /* in kHz */ 63 }; 64 65 struct cpufreq_policy { 66 /* CPUs sharing clock, require sw coordination */ 67 cpumask_var_t cpus; /* Online CPUs only */ 68 cpumask_var_t related_cpus; /* Online + Offline CPUs */ 69 cpumask_var_t real_cpus; /* Related and present */ 70 71 unsigned int shared_type; /* ACPI: ANY or ALL affected CPUs 72 should set cpufreq */ 73 unsigned int cpu; /* cpu managing this policy, must be online */ 74 75 struct clk *clk; 76 struct cpufreq_cpuinfo cpuinfo;/* see above */ 77 78 unsigned int min; /* in kHz */ 79 unsigned int max; /* in kHz */ 80 unsigned int cur; /* in kHz, only needed if cpufreq 81 * governors are used */ 82 unsigned int restore_freq; /* = policy->cur before transition */ 83 unsigned int suspend_freq; /* freq to set during suspend */ 84 85 unsigned int policy; /* see above */ 86 unsigned int last_policy; /* policy before unplug */ 87 struct cpufreq_governor *governor; /* see below */ 88 void *governor_data; 89 char last_governor[CPUFREQ_NAME_LEN]; /* last governor used */ 90 91 struct work_struct update; /* if update_policy() needs to be 92 * called, but you're in IRQ context */ 93 94 struct cpufreq_user_policy user_policy; 95 struct cpufreq_frequency_table *freq_table; 96 enum cpufreq_table_sorting freq_table_sorted; 97 98 struct list_head policy_list; 99 struct kobject kobj; 100 struct completion kobj_unregister; 101 102 /* 103 * The rules for this semaphore: 104 * - Any routine that wants to read from the policy structure will 105 * do a down_read on this semaphore. 106 * - Any routine that will write to the policy structure and/or may take away 107 * the policy altogether (eg. CPU hotplug), will hold this lock in write 108 * mode before doing so. 109 */ 110 struct rw_semaphore rwsem; 111 112 /* 113 * Fast switch flags: 114 * - fast_switch_possible should be set by the driver if it can 115 * guarantee that frequency can be changed on any CPU sharing the 116 * policy and that the change will affect all of the policy CPUs then. 117 * - fast_switch_enabled is to be set by governors that support fast 118 * frequency switching with the help of cpufreq_enable_fast_switch(). 119 */ 120 bool fast_switch_possible; 121 bool fast_switch_enabled; 122 123 /* 124 * Preferred average time interval between consecutive invocations of 125 * the driver to set the frequency for this policy. To be set by the 126 * scaling driver (0, which is the default, means no preference). 127 */ 128 unsigned int transition_delay_us; 129 130 /* 131 * Remote DVFS flag (Not added to the driver structure as we don't want 132 * to access another structure from scheduler hotpath). 133 * 134 * Should be set if CPUs can do DVFS on behalf of other CPUs from 135 * different cpufreq policies. 136 */ 137 bool dvfs_possible_from_any_cpu; 138 139 /* Cached frequency lookup from cpufreq_driver_resolve_freq. */ 140 unsigned int cached_target_freq; 141 int cached_resolved_idx; 142 143 /* Synchronization for frequency transitions */ 144 bool transition_ongoing; /* Tracks transition status */ 145 spinlock_t transition_lock; 146 wait_queue_head_t transition_wait; 147 struct task_struct *transition_task; /* Task which is doing the transition */ 148 149 /* cpufreq-stats */ 150 struct cpufreq_stats *stats; 151 152 /* For cpufreq driver's internal use */ 153 void *driver_data; 154 }; 155 156 /* Only for ACPI */ 157 #define CPUFREQ_SHARED_TYPE_NONE (0) /* None */ 158 #define CPUFREQ_SHARED_TYPE_HW (1) /* HW does needed coordination */ 159 #define CPUFREQ_SHARED_TYPE_ALL (2) /* All dependent CPUs should set freq */ 160 #define CPUFREQ_SHARED_TYPE_ANY (3) /* Freq can be set from any dependent CPU*/ 161 162 #ifdef CONFIG_CPU_FREQ 163 struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu); 164 struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu); 165 void cpufreq_cpu_put(struct cpufreq_policy *policy); 166 #else 167 static inline struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu) 168 { 169 return NULL; 170 } 171 static inline struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu) 172 { 173 return NULL; 174 } 175 static inline void cpufreq_cpu_put(struct cpufreq_policy *policy) { } 176 #endif 177 178 static inline bool policy_is_shared(struct cpufreq_policy *policy) 179 { 180 return cpumask_weight(policy->cpus) > 1; 181 } 182 183 /* /sys/devices/system/cpu/cpufreq: entry point for global variables */ 184 extern struct kobject *cpufreq_global_kobject; 185 186 #ifdef CONFIG_CPU_FREQ 187 unsigned int cpufreq_get(unsigned int cpu); 188 unsigned int cpufreq_quick_get(unsigned int cpu); 189 unsigned int cpufreq_quick_get_max(unsigned int cpu); 190 void disable_cpufreq(void); 191 192 u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy); 193 int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu); 194 void cpufreq_update_policy(unsigned int cpu); 195 bool have_governor_per_policy(void); 196 struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy); 197 void cpufreq_enable_fast_switch(struct cpufreq_policy *policy); 198 void cpufreq_disable_fast_switch(struct cpufreq_policy *policy); 199 #else 200 static inline unsigned int cpufreq_get(unsigned int cpu) 201 { 202 return 0; 203 } 204 static inline unsigned int cpufreq_quick_get(unsigned int cpu) 205 { 206 return 0; 207 } 208 static inline unsigned int cpufreq_quick_get_max(unsigned int cpu) 209 { 210 return 0; 211 } 212 static inline void disable_cpufreq(void) { } 213 #endif 214 215 #ifdef CONFIG_CPU_FREQ_STAT 216 void cpufreq_stats_create_table(struct cpufreq_policy *policy); 217 void cpufreq_stats_free_table(struct cpufreq_policy *policy); 218 void cpufreq_stats_record_transition(struct cpufreq_policy *policy, 219 unsigned int new_freq); 220 #else 221 static inline void cpufreq_stats_create_table(struct cpufreq_policy *policy) { } 222 static inline void cpufreq_stats_free_table(struct cpufreq_policy *policy) { } 223 static inline void cpufreq_stats_record_transition(struct cpufreq_policy *policy, 224 unsigned int new_freq) { } 225 #endif /* CONFIG_CPU_FREQ_STAT */ 226 227 /********************************************************************* 228 * CPUFREQ DRIVER INTERFACE * 229 *********************************************************************/ 230 231 #define CPUFREQ_RELATION_L 0 /* lowest frequency at or above target */ 232 #define CPUFREQ_RELATION_H 1 /* highest frequency below or at target */ 233 #define CPUFREQ_RELATION_C 2 /* closest frequency to target */ 234 235 struct freq_attr { 236 struct attribute attr; 237 ssize_t (*show)(struct cpufreq_policy *, char *); 238 ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count); 239 }; 240 241 #define cpufreq_freq_attr_ro(_name) \ 242 static struct freq_attr _name = \ 243 __ATTR(_name, 0444, show_##_name, NULL) 244 245 #define cpufreq_freq_attr_ro_perm(_name, _perm) \ 246 static struct freq_attr _name = \ 247 __ATTR(_name, _perm, show_##_name, NULL) 248 249 #define cpufreq_freq_attr_rw(_name) \ 250 static struct freq_attr _name = \ 251 __ATTR(_name, 0644, show_##_name, store_##_name) 252 253 #define cpufreq_freq_attr_wo(_name) \ 254 static struct freq_attr _name = \ 255 __ATTR(_name, 0200, NULL, store_##_name) 256 257 struct global_attr { 258 struct attribute attr; 259 ssize_t (*show)(struct kobject *kobj, 260 struct attribute *attr, char *buf); 261 ssize_t (*store)(struct kobject *a, struct attribute *b, 262 const char *c, size_t count); 263 }; 264 265 #define define_one_global_ro(_name) \ 266 static struct global_attr _name = \ 267 __ATTR(_name, 0444, show_##_name, NULL) 268 269 #define define_one_global_rw(_name) \ 270 static struct global_attr _name = \ 271 __ATTR(_name, 0644, show_##_name, store_##_name) 272 273 274 struct cpufreq_driver { 275 char name[CPUFREQ_NAME_LEN]; 276 u8 flags; 277 void *driver_data; 278 279 /* needed by all drivers */ 280 int (*init)(struct cpufreq_policy *policy); 281 int (*verify)(struct cpufreq_policy *policy); 282 283 /* define one out of two */ 284 int (*setpolicy)(struct cpufreq_policy *policy); 285 286 /* 287 * On failure, should always restore frequency to policy->restore_freq 288 * (i.e. old freq). 289 */ 290 int (*target)(struct cpufreq_policy *policy, 291 unsigned int target_freq, 292 unsigned int relation); /* Deprecated */ 293 int (*target_index)(struct cpufreq_policy *policy, 294 unsigned int index); 295 unsigned int (*fast_switch)(struct cpufreq_policy *policy, 296 unsigned int target_freq); 297 298 /* 299 * Caches and returns the lowest driver-supported frequency greater than 300 * or equal to the target frequency, subject to any driver limitations. 301 * Does not set the frequency. Only to be implemented for drivers with 302 * target(). 303 */ 304 unsigned int (*resolve_freq)(struct cpufreq_policy *policy, 305 unsigned int target_freq); 306 307 /* 308 * Only for drivers with target_index() and CPUFREQ_ASYNC_NOTIFICATION 309 * unset. 310 * 311 * get_intermediate should return a stable intermediate frequency 312 * platform wants to switch to and target_intermediate() should set CPU 313 * to to that frequency, before jumping to the frequency corresponding 314 * to 'index'. Core will take care of sending notifications and driver 315 * doesn't have to handle them in target_intermediate() or 316 * target_index(). 317 * 318 * Drivers can return '0' from get_intermediate() in case they don't 319 * wish to switch to intermediate frequency for some target frequency. 320 * In that case core will directly call ->target_index(). 321 */ 322 unsigned int (*get_intermediate)(struct cpufreq_policy *policy, 323 unsigned int index); 324 int (*target_intermediate)(struct cpufreq_policy *policy, 325 unsigned int index); 326 327 /* should be defined, if possible */ 328 unsigned int (*get)(unsigned int cpu); 329 330 /* optional */ 331 int (*bios_limit)(int cpu, unsigned int *limit); 332 333 int (*exit)(struct cpufreq_policy *policy); 334 void (*stop_cpu)(struct cpufreq_policy *policy); 335 int (*suspend)(struct cpufreq_policy *policy); 336 int (*resume)(struct cpufreq_policy *policy); 337 338 /* Will be called after the driver is fully initialized */ 339 void (*ready)(struct cpufreq_policy *policy); 340 341 struct freq_attr **attr; 342 343 /* platform specific boost support code */ 344 bool boost_enabled; 345 int (*set_boost)(int state); 346 }; 347 348 /* flags */ 349 #define CPUFREQ_STICKY (1 << 0) /* driver isn't removed even if 350 all ->init() calls failed */ 351 #define CPUFREQ_CONST_LOOPS (1 << 1) /* loops_per_jiffy or other 352 kernel "constants" aren't 353 affected by frequency 354 transitions */ 355 #define CPUFREQ_PM_NO_WARN (1 << 2) /* don't warn on suspend/resume 356 speed mismatches */ 357 358 /* 359 * This should be set by platforms having multiple clock-domains, i.e. 360 * supporting multiple policies. With this sysfs directories of governor would 361 * be created in cpu/cpu<num>/cpufreq/ directory and so they can use the same 362 * governor with different tunables for different clusters. 363 */ 364 #define CPUFREQ_HAVE_GOVERNOR_PER_POLICY (1 << 3) 365 366 /* 367 * Driver will do POSTCHANGE notifications from outside of their ->target() 368 * routine and so must set cpufreq_driver->flags with this flag, so that core 369 * can handle them specially. 370 */ 371 #define CPUFREQ_ASYNC_NOTIFICATION (1 << 4) 372 373 /* 374 * Set by drivers which want cpufreq core to check if CPU is running at a 375 * frequency present in freq-table exposed by the driver. For these drivers if 376 * CPU is found running at an out of table freq, we will try to set it to a freq 377 * from the table. And if that fails, we will stop further boot process by 378 * issuing a BUG_ON(). 379 */ 380 #define CPUFREQ_NEED_INITIAL_FREQ_CHECK (1 << 5) 381 382 /* 383 * Set by drivers to disallow use of governors with "dynamic_switching" flag 384 * set. 385 */ 386 #define CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING (1 << 6) 387 388 int cpufreq_register_driver(struct cpufreq_driver *driver_data); 389 int cpufreq_unregister_driver(struct cpufreq_driver *driver_data); 390 391 const char *cpufreq_get_current_driver(void); 392 void *cpufreq_get_driver_data(void); 393 394 static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy, 395 unsigned int min, unsigned int max) 396 { 397 if (policy->min < min) 398 policy->min = min; 399 if (policy->max < min) 400 policy->max = min; 401 if (policy->min > max) 402 policy->min = max; 403 if (policy->max > max) 404 policy->max = max; 405 if (policy->min > policy->max) 406 policy->min = policy->max; 407 return; 408 } 409 410 static inline void 411 cpufreq_verify_within_cpu_limits(struct cpufreq_policy *policy) 412 { 413 cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, 414 policy->cpuinfo.max_freq); 415 } 416 417 #ifdef CONFIG_CPU_FREQ 418 void cpufreq_suspend(void); 419 void cpufreq_resume(void); 420 int cpufreq_generic_suspend(struct cpufreq_policy *policy); 421 #else 422 static inline void cpufreq_suspend(void) {} 423 static inline void cpufreq_resume(void) {} 424 #endif 425 426 /********************************************************************* 427 * CPUFREQ NOTIFIER INTERFACE * 428 *********************************************************************/ 429 430 #define CPUFREQ_TRANSITION_NOTIFIER (0) 431 #define CPUFREQ_POLICY_NOTIFIER (1) 432 433 /* Transition notifiers */ 434 #define CPUFREQ_PRECHANGE (0) 435 #define CPUFREQ_POSTCHANGE (1) 436 437 /* Policy Notifiers */ 438 #define CPUFREQ_ADJUST (0) 439 #define CPUFREQ_NOTIFY (1) 440 441 #ifdef CONFIG_CPU_FREQ 442 int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list); 443 int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list); 444 445 void cpufreq_freq_transition_begin(struct cpufreq_policy *policy, 446 struct cpufreq_freqs *freqs); 447 void cpufreq_freq_transition_end(struct cpufreq_policy *policy, 448 struct cpufreq_freqs *freqs, int transition_failed); 449 450 #else /* CONFIG_CPU_FREQ */ 451 static inline int cpufreq_register_notifier(struct notifier_block *nb, 452 unsigned int list) 453 { 454 return 0; 455 } 456 static inline int cpufreq_unregister_notifier(struct notifier_block *nb, 457 unsigned int list) 458 { 459 return 0; 460 } 461 #endif /* !CONFIG_CPU_FREQ */ 462 463 /** 464 * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch 465 * safe) 466 * @old: old value 467 * @div: divisor 468 * @mult: multiplier 469 * 470 * 471 * new = old * mult / div 472 */ 473 static inline unsigned long cpufreq_scale(unsigned long old, u_int div, 474 u_int mult) 475 { 476 #if BITS_PER_LONG == 32 477 u64 result = ((u64) old) * ((u64) mult); 478 do_div(result, div); 479 return (unsigned long) result; 480 481 #elif BITS_PER_LONG == 64 482 unsigned long result = old * ((u64) mult); 483 result /= div; 484 return result; 485 #endif 486 } 487 488 /********************************************************************* 489 * CPUFREQ GOVERNORS * 490 *********************************************************************/ 491 492 /* 493 * If (cpufreq_driver->target) exists, the ->governor decides what frequency 494 * within the limits is used. If (cpufreq_driver->setpolicy> exists, these 495 * two generic policies are available: 496 */ 497 #define CPUFREQ_POLICY_POWERSAVE (1) 498 #define CPUFREQ_POLICY_PERFORMANCE (2) 499 500 /* 501 * The polling frequency depends on the capability of the processor. Default 502 * polling frequency is 1000 times the transition latency of the processor. The 503 * ondemand governor will work on any processor with transition latency <= 10ms, 504 * using appropriate sampling rate. 505 */ 506 #define LATENCY_MULTIPLIER (1000) 507 508 struct cpufreq_governor { 509 char name[CPUFREQ_NAME_LEN]; 510 int (*init)(struct cpufreq_policy *policy); 511 void (*exit)(struct cpufreq_policy *policy); 512 int (*start)(struct cpufreq_policy *policy); 513 void (*stop)(struct cpufreq_policy *policy); 514 void (*limits)(struct cpufreq_policy *policy); 515 ssize_t (*show_setspeed) (struct cpufreq_policy *policy, 516 char *buf); 517 int (*store_setspeed) (struct cpufreq_policy *policy, 518 unsigned int freq); 519 /* For governors which change frequency dynamically by themselves */ 520 bool dynamic_switching; 521 struct list_head governor_list; 522 struct module *owner; 523 }; 524 525 /* Pass a target to the cpufreq driver */ 526 unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy, 527 unsigned int target_freq); 528 int cpufreq_driver_target(struct cpufreq_policy *policy, 529 unsigned int target_freq, 530 unsigned int relation); 531 int __cpufreq_driver_target(struct cpufreq_policy *policy, 532 unsigned int target_freq, 533 unsigned int relation); 534 unsigned int cpufreq_driver_resolve_freq(struct cpufreq_policy *policy, 535 unsigned int target_freq); 536 unsigned int cpufreq_policy_transition_delay_us(struct cpufreq_policy *policy); 537 int cpufreq_register_governor(struct cpufreq_governor *governor); 538 void cpufreq_unregister_governor(struct cpufreq_governor *governor); 539 540 struct cpufreq_governor *cpufreq_default_governor(void); 541 struct cpufreq_governor *cpufreq_fallback_governor(void); 542 543 static inline void cpufreq_policy_apply_limits(struct cpufreq_policy *policy) 544 { 545 if (policy->max < policy->cur) 546 __cpufreq_driver_target(policy, policy->max, CPUFREQ_RELATION_H); 547 else if (policy->min > policy->cur) 548 __cpufreq_driver_target(policy, policy->min, CPUFREQ_RELATION_L); 549 } 550 551 /* Governor attribute set */ 552 struct gov_attr_set { 553 struct kobject kobj; 554 struct list_head policy_list; 555 struct mutex update_lock; 556 int usage_count; 557 }; 558 559 /* sysfs ops for cpufreq governors */ 560 extern const struct sysfs_ops governor_sysfs_ops; 561 562 void gov_attr_set_init(struct gov_attr_set *attr_set, struct list_head *list_node); 563 void gov_attr_set_get(struct gov_attr_set *attr_set, struct list_head *list_node); 564 unsigned int gov_attr_set_put(struct gov_attr_set *attr_set, struct list_head *list_node); 565 566 /* Governor sysfs attribute */ 567 struct governor_attr { 568 struct attribute attr; 569 ssize_t (*show)(struct gov_attr_set *attr_set, char *buf); 570 ssize_t (*store)(struct gov_attr_set *attr_set, const char *buf, 571 size_t count); 572 }; 573 574 static inline bool cpufreq_can_do_remote_dvfs(struct cpufreq_policy *policy) 575 { 576 /* 577 * Allow remote callbacks if: 578 * - dvfs_possible_from_any_cpu flag is set 579 * - the local and remote CPUs share cpufreq policy 580 */ 581 return policy->dvfs_possible_from_any_cpu || 582 cpumask_test_cpu(smp_processor_id(), policy->cpus); 583 } 584 585 /********************************************************************* 586 * FREQUENCY TABLE HELPERS * 587 *********************************************************************/ 588 589 /* Special Values of .frequency field */ 590 #define CPUFREQ_ENTRY_INVALID ~0u 591 #define CPUFREQ_TABLE_END ~1u 592 /* Special Values of .flags field */ 593 #define CPUFREQ_BOOST_FREQ (1 << 0) 594 595 struct cpufreq_frequency_table { 596 unsigned int flags; 597 unsigned int driver_data; /* driver specific data, not used by core */ 598 unsigned int frequency; /* kHz - doesn't need to be in ascending 599 * order */ 600 }; 601 602 #if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP) 603 int dev_pm_opp_init_cpufreq_table(struct device *dev, 604 struct cpufreq_frequency_table **table); 605 void dev_pm_opp_free_cpufreq_table(struct device *dev, 606 struct cpufreq_frequency_table **table); 607 #else 608 static inline int dev_pm_opp_init_cpufreq_table(struct device *dev, 609 struct cpufreq_frequency_table 610 **table) 611 { 612 return -EINVAL; 613 } 614 615 static inline void dev_pm_opp_free_cpufreq_table(struct device *dev, 616 struct cpufreq_frequency_table 617 **table) 618 { 619 } 620 #endif 621 622 /* 623 * cpufreq_for_each_entry - iterate over a cpufreq_frequency_table 624 * @pos: the cpufreq_frequency_table * to use as a loop cursor. 625 * @table: the cpufreq_frequency_table * to iterate over. 626 */ 627 628 #define cpufreq_for_each_entry(pos, table) \ 629 for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++) 630 631 /* 632 * cpufreq_for_each_valid_entry - iterate over a cpufreq_frequency_table 633 * excluding CPUFREQ_ENTRY_INVALID frequencies. 634 * @pos: the cpufreq_frequency_table * to use as a loop cursor. 635 * @table: the cpufreq_frequency_table * to iterate over. 636 */ 637 638 #define cpufreq_for_each_valid_entry(pos, table) \ 639 for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++) \ 640 if (pos->frequency == CPUFREQ_ENTRY_INVALID) \ 641 continue; \ 642 else 643 644 int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy, 645 struct cpufreq_frequency_table *table); 646 647 int cpufreq_frequency_table_verify(struct cpufreq_policy *policy, 648 struct cpufreq_frequency_table *table); 649 int cpufreq_generic_frequency_table_verify(struct cpufreq_policy *policy); 650 651 int cpufreq_table_index_unsorted(struct cpufreq_policy *policy, 652 unsigned int target_freq, 653 unsigned int relation); 654 int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy, 655 unsigned int freq); 656 657 ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf); 658 659 #ifdef CONFIG_CPU_FREQ 660 int cpufreq_boost_trigger_state(int state); 661 int cpufreq_boost_enabled(void); 662 int cpufreq_enable_boost_support(void); 663 bool policy_has_boost_freq(struct cpufreq_policy *policy); 664 665 /* Find lowest freq at or above target in a table in ascending order */ 666 static inline int cpufreq_table_find_index_al(struct cpufreq_policy *policy, 667 unsigned int target_freq) 668 { 669 struct cpufreq_frequency_table *table = policy->freq_table; 670 struct cpufreq_frequency_table *pos, *best = table - 1; 671 unsigned int freq; 672 673 cpufreq_for_each_valid_entry(pos, table) { 674 freq = pos->frequency; 675 676 if (freq >= target_freq) 677 return pos - table; 678 679 best = pos; 680 } 681 682 return best - table; 683 } 684 685 /* Find lowest freq at or above target in a table in descending order */ 686 static inline int cpufreq_table_find_index_dl(struct cpufreq_policy *policy, 687 unsigned int target_freq) 688 { 689 struct cpufreq_frequency_table *table = policy->freq_table; 690 struct cpufreq_frequency_table *pos, *best = table - 1; 691 unsigned int freq; 692 693 cpufreq_for_each_valid_entry(pos, table) { 694 freq = pos->frequency; 695 696 if (freq == target_freq) 697 return pos - table; 698 699 if (freq > target_freq) { 700 best = pos; 701 continue; 702 } 703 704 /* No freq found above target_freq */ 705 if (best == table - 1) 706 return pos - table; 707 708 return best - table; 709 } 710 711 return best - table; 712 } 713 714 /* Works only on sorted freq-tables */ 715 static inline int cpufreq_table_find_index_l(struct cpufreq_policy *policy, 716 unsigned int target_freq) 717 { 718 target_freq = clamp_val(target_freq, policy->min, policy->max); 719 720 if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING) 721 return cpufreq_table_find_index_al(policy, target_freq); 722 else 723 return cpufreq_table_find_index_dl(policy, target_freq); 724 } 725 726 /* Find highest freq at or below target in a table in ascending order */ 727 static inline int cpufreq_table_find_index_ah(struct cpufreq_policy *policy, 728 unsigned int target_freq) 729 { 730 struct cpufreq_frequency_table *table = policy->freq_table; 731 struct cpufreq_frequency_table *pos, *best = table - 1; 732 unsigned int freq; 733 734 cpufreq_for_each_valid_entry(pos, table) { 735 freq = pos->frequency; 736 737 if (freq == target_freq) 738 return pos - table; 739 740 if (freq < target_freq) { 741 best = pos; 742 continue; 743 } 744 745 /* No freq found below target_freq */ 746 if (best == table - 1) 747 return pos - table; 748 749 return best - table; 750 } 751 752 return best - table; 753 } 754 755 /* Find highest freq at or below target in a table in descending order */ 756 static inline int cpufreq_table_find_index_dh(struct cpufreq_policy *policy, 757 unsigned int target_freq) 758 { 759 struct cpufreq_frequency_table *table = policy->freq_table; 760 struct cpufreq_frequency_table *pos, *best = table - 1; 761 unsigned int freq; 762 763 cpufreq_for_each_valid_entry(pos, table) { 764 freq = pos->frequency; 765 766 if (freq <= target_freq) 767 return pos - table; 768 769 best = pos; 770 } 771 772 return best - table; 773 } 774 775 /* Works only on sorted freq-tables */ 776 static inline int cpufreq_table_find_index_h(struct cpufreq_policy *policy, 777 unsigned int target_freq) 778 { 779 target_freq = clamp_val(target_freq, policy->min, policy->max); 780 781 if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING) 782 return cpufreq_table_find_index_ah(policy, target_freq); 783 else 784 return cpufreq_table_find_index_dh(policy, target_freq); 785 } 786 787 /* Find closest freq to target in a table in ascending order */ 788 static inline int cpufreq_table_find_index_ac(struct cpufreq_policy *policy, 789 unsigned int target_freq) 790 { 791 struct cpufreq_frequency_table *table = policy->freq_table; 792 struct cpufreq_frequency_table *pos, *best = table - 1; 793 unsigned int freq; 794 795 cpufreq_for_each_valid_entry(pos, table) { 796 freq = pos->frequency; 797 798 if (freq == target_freq) 799 return pos - table; 800 801 if (freq < target_freq) { 802 best = pos; 803 continue; 804 } 805 806 /* No freq found below target_freq */ 807 if (best == table - 1) 808 return pos - table; 809 810 /* Choose the closest freq */ 811 if (target_freq - best->frequency > freq - target_freq) 812 return pos - table; 813 814 return best - table; 815 } 816 817 return best - table; 818 } 819 820 /* Find closest freq to target in a table in descending order */ 821 static inline int cpufreq_table_find_index_dc(struct cpufreq_policy *policy, 822 unsigned int target_freq) 823 { 824 struct cpufreq_frequency_table *table = policy->freq_table; 825 struct cpufreq_frequency_table *pos, *best = table - 1; 826 unsigned int freq; 827 828 cpufreq_for_each_valid_entry(pos, table) { 829 freq = pos->frequency; 830 831 if (freq == target_freq) 832 return pos - table; 833 834 if (freq > target_freq) { 835 best = pos; 836 continue; 837 } 838 839 /* No freq found above target_freq */ 840 if (best == table - 1) 841 return pos - table; 842 843 /* Choose the closest freq */ 844 if (best->frequency - target_freq > target_freq - freq) 845 return pos - table; 846 847 return best - table; 848 } 849 850 return best - table; 851 } 852 853 /* Works only on sorted freq-tables */ 854 static inline int cpufreq_table_find_index_c(struct cpufreq_policy *policy, 855 unsigned int target_freq) 856 { 857 target_freq = clamp_val(target_freq, policy->min, policy->max); 858 859 if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING) 860 return cpufreq_table_find_index_ac(policy, target_freq); 861 else 862 return cpufreq_table_find_index_dc(policy, target_freq); 863 } 864 865 static inline int cpufreq_frequency_table_target(struct cpufreq_policy *policy, 866 unsigned int target_freq, 867 unsigned int relation) 868 { 869 if (unlikely(policy->freq_table_sorted == CPUFREQ_TABLE_UNSORTED)) 870 return cpufreq_table_index_unsorted(policy, target_freq, 871 relation); 872 873 switch (relation) { 874 case CPUFREQ_RELATION_L: 875 return cpufreq_table_find_index_l(policy, target_freq); 876 case CPUFREQ_RELATION_H: 877 return cpufreq_table_find_index_h(policy, target_freq); 878 case CPUFREQ_RELATION_C: 879 return cpufreq_table_find_index_c(policy, target_freq); 880 default: 881 pr_err("%s: Invalid relation: %d\n", __func__, relation); 882 return -EINVAL; 883 } 884 } 885 886 static inline int cpufreq_table_count_valid_entries(const struct cpufreq_policy *policy) 887 { 888 struct cpufreq_frequency_table *pos; 889 int count = 0; 890 891 if (unlikely(!policy->freq_table)) 892 return 0; 893 894 cpufreq_for_each_valid_entry(pos, policy->freq_table) 895 count++; 896 897 return count; 898 } 899 #else 900 static inline int cpufreq_boost_trigger_state(int state) 901 { 902 return 0; 903 } 904 static inline int cpufreq_boost_enabled(void) 905 { 906 return 0; 907 } 908 909 static inline int cpufreq_enable_boost_support(void) 910 { 911 return -EINVAL; 912 } 913 914 static inline bool policy_has_boost_freq(struct cpufreq_policy *policy) 915 { 916 return false; 917 } 918 #endif 919 920 extern void arch_freq_prepare_all(void); 921 extern unsigned int arch_freq_get_on_cpu(int cpu); 922 923 extern void arch_set_freq_scale(struct cpumask *cpus, unsigned long cur_freq, 924 unsigned long max_freq); 925 926 /* the following are really really optional */ 927 extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs; 928 extern struct freq_attr cpufreq_freq_attr_scaling_boost_freqs; 929 extern struct freq_attr *cpufreq_generic_attr[]; 930 int cpufreq_table_validate_and_show(struct cpufreq_policy *policy, 931 struct cpufreq_frequency_table *table); 932 933 unsigned int cpufreq_generic_get(unsigned int cpu); 934 int cpufreq_generic_init(struct cpufreq_policy *policy, 935 struct cpufreq_frequency_table *table, 936 unsigned int transition_latency); 937 #endif /* _LINUX_CPUFREQ_H */ 938