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 /* Cached frequency lookup from cpufreq_driver_resolve_freq. */ 124 unsigned int cached_target_freq; 125 int cached_resolved_idx; 126 127 /* Synchronization for frequency transitions */ 128 bool transition_ongoing; /* Tracks transition status */ 129 spinlock_t transition_lock; 130 wait_queue_head_t transition_wait; 131 struct task_struct *transition_task; /* Task which is doing the transition */ 132 133 /* cpufreq-stats */ 134 struct cpufreq_stats *stats; 135 136 /* For cpufreq driver's internal use */ 137 void *driver_data; 138 }; 139 140 /* Only for ACPI */ 141 #define CPUFREQ_SHARED_TYPE_NONE (0) /* None */ 142 #define CPUFREQ_SHARED_TYPE_HW (1) /* HW does needed coordination */ 143 #define CPUFREQ_SHARED_TYPE_ALL (2) /* All dependent CPUs should set freq */ 144 #define CPUFREQ_SHARED_TYPE_ANY (3) /* Freq can be set from any dependent CPU*/ 145 146 #ifdef CONFIG_CPU_FREQ 147 struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu); 148 struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu); 149 void cpufreq_cpu_put(struct cpufreq_policy *policy); 150 #else 151 static inline struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu) 152 { 153 return NULL; 154 } 155 static inline struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu) 156 { 157 return NULL; 158 } 159 static inline void cpufreq_cpu_put(struct cpufreq_policy *policy) { } 160 #endif 161 162 static inline bool policy_is_shared(struct cpufreq_policy *policy) 163 { 164 return cpumask_weight(policy->cpus) > 1; 165 } 166 167 /* /sys/devices/system/cpu/cpufreq: entry point for global variables */ 168 extern struct kobject *cpufreq_global_kobject; 169 170 #ifdef CONFIG_CPU_FREQ 171 unsigned int cpufreq_get(unsigned int cpu); 172 unsigned int cpufreq_quick_get(unsigned int cpu); 173 unsigned int cpufreq_quick_get_max(unsigned int cpu); 174 void disable_cpufreq(void); 175 176 u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy); 177 int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu); 178 void cpufreq_update_policy(unsigned int cpu); 179 bool have_governor_per_policy(void); 180 struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy); 181 void cpufreq_enable_fast_switch(struct cpufreq_policy *policy); 182 void cpufreq_disable_fast_switch(struct cpufreq_policy *policy); 183 #else 184 static inline unsigned int cpufreq_get(unsigned int cpu) 185 { 186 return 0; 187 } 188 static inline unsigned int cpufreq_quick_get(unsigned int cpu) 189 { 190 return 0; 191 } 192 static inline unsigned int cpufreq_quick_get_max(unsigned int cpu) 193 { 194 return 0; 195 } 196 static inline void disable_cpufreq(void) { } 197 #endif 198 199 #ifdef CONFIG_CPU_FREQ_STAT 200 void cpufreq_stats_create_table(struct cpufreq_policy *policy); 201 void cpufreq_stats_free_table(struct cpufreq_policy *policy); 202 void cpufreq_stats_record_transition(struct cpufreq_policy *policy, 203 unsigned int new_freq); 204 #else 205 static inline void cpufreq_stats_create_table(struct cpufreq_policy *policy) { } 206 static inline void cpufreq_stats_free_table(struct cpufreq_policy *policy) { } 207 static inline void cpufreq_stats_record_transition(struct cpufreq_policy *policy, 208 unsigned int new_freq) { } 209 #endif /* CONFIG_CPU_FREQ_STAT */ 210 211 /********************************************************************* 212 * CPUFREQ DRIVER INTERFACE * 213 *********************************************************************/ 214 215 #define CPUFREQ_RELATION_L 0 /* lowest frequency at or above target */ 216 #define CPUFREQ_RELATION_H 1 /* highest frequency below or at target */ 217 #define CPUFREQ_RELATION_C 2 /* closest frequency to target */ 218 219 struct freq_attr { 220 struct attribute attr; 221 ssize_t (*show)(struct cpufreq_policy *, char *); 222 ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count); 223 }; 224 225 #define cpufreq_freq_attr_ro(_name) \ 226 static struct freq_attr _name = \ 227 __ATTR(_name, 0444, show_##_name, NULL) 228 229 #define cpufreq_freq_attr_ro_perm(_name, _perm) \ 230 static struct freq_attr _name = \ 231 __ATTR(_name, _perm, show_##_name, NULL) 232 233 #define cpufreq_freq_attr_rw(_name) \ 234 static struct freq_attr _name = \ 235 __ATTR(_name, 0644, show_##_name, store_##_name) 236 237 #define cpufreq_freq_attr_wo(_name) \ 238 static struct freq_attr _name = \ 239 __ATTR(_name, 0200, NULL, store_##_name) 240 241 struct global_attr { 242 struct attribute attr; 243 ssize_t (*show)(struct kobject *kobj, 244 struct attribute *attr, char *buf); 245 ssize_t (*store)(struct kobject *a, struct attribute *b, 246 const char *c, size_t count); 247 }; 248 249 #define define_one_global_ro(_name) \ 250 static struct global_attr _name = \ 251 __ATTR(_name, 0444, show_##_name, NULL) 252 253 #define define_one_global_rw(_name) \ 254 static struct global_attr _name = \ 255 __ATTR(_name, 0644, show_##_name, store_##_name) 256 257 258 struct cpufreq_driver { 259 char name[CPUFREQ_NAME_LEN]; 260 u8 flags; 261 void *driver_data; 262 263 /* needed by all drivers */ 264 int (*init)(struct cpufreq_policy *policy); 265 int (*verify)(struct cpufreq_policy *policy); 266 267 /* define one out of two */ 268 int (*setpolicy)(struct cpufreq_policy *policy); 269 270 /* 271 * On failure, should always restore frequency to policy->restore_freq 272 * (i.e. old freq). 273 */ 274 int (*target)(struct cpufreq_policy *policy, 275 unsigned int target_freq, 276 unsigned int relation); /* Deprecated */ 277 int (*target_index)(struct cpufreq_policy *policy, 278 unsigned int index); 279 unsigned int (*fast_switch)(struct cpufreq_policy *policy, 280 unsigned int target_freq); 281 282 /* 283 * Caches and returns the lowest driver-supported frequency greater than 284 * or equal to the target frequency, subject to any driver limitations. 285 * Does not set the frequency. Only to be implemented for drivers with 286 * target(). 287 */ 288 unsigned int (*resolve_freq)(struct cpufreq_policy *policy, 289 unsigned int target_freq); 290 291 /* 292 * Only for drivers with target_index() and CPUFREQ_ASYNC_NOTIFICATION 293 * unset. 294 * 295 * get_intermediate should return a stable intermediate frequency 296 * platform wants to switch to and target_intermediate() should set CPU 297 * to to that frequency, before jumping to the frequency corresponding 298 * to 'index'. Core will take care of sending notifications and driver 299 * doesn't have to handle them in target_intermediate() or 300 * target_index(). 301 * 302 * Drivers can return '0' from get_intermediate() in case they don't 303 * wish to switch to intermediate frequency for some target frequency. 304 * In that case core will directly call ->target_index(). 305 */ 306 unsigned int (*get_intermediate)(struct cpufreq_policy *policy, 307 unsigned int index); 308 int (*target_intermediate)(struct cpufreq_policy *policy, 309 unsigned int index); 310 311 /* should be defined, if possible */ 312 unsigned int (*get)(unsigned int cpu); 313 314 /* optional */ 315 int (*bios_limit)(int cpu, unsigned int *limit); 316 317 int (*exit)(struct cpufreq_policy *policy); 318 void (*stop_cpu)(struct cpufreq_policy *policy); 319 int (*suspend)(struct cpufreq_policy *policy); 320 int (*resume)(struct cpufreq_policy *policy); 321 322 /* Will be called after the driver is fully initialized */ 323 void (*ready)(struct cpufreq_policy *policy); 324 325 struct freq_attr **attr; 326 327 /* platform specific boost support code */ 328 bool boost_enabled; 329 int (*set_boost)(int state); 330 }; 331 332 /* flags */ 333 #define CPUFREQ_STICKY (1 << 0) /* driver isn't removed even if 334 all ->init() calls failed */ 335 #define CPUFREQ_CONST_LOOPS (1 << 1) /* loops_per_jiffy or other 336 kernel "constants" aren't 337 affected by frequency 338 transitions */ 339 #define CPUFREQ_PM_NO_WARN (1 << 2) /* don't warn on suspend/resume 340 speed mismatches */ 341 342 /* 343 * This should be set by platforms having multiple clock-domains, i.e. 344 * supporting multiple policies. With this sysfs directories of governor would 345 * be created in cpu/cpu<num>/cpufreq/ directory and so they can use the same 346 * governor with different tunables for different clusters. 347 */ 348 #define CPUFREQ_HAVE_GOVERNOR_PER_POLICY (1 << 3) 349 350 /* 351 * Driver will do POSTCHANGE notifications from outside of their ->target() 352 * routine and so must set cpufreq_driver->flags with this flag, so that core 353 * can handle them specially. 354 */ 355 #define CPUFREQ_ASYNC_NOTIFICATION (1 << 4) 356 357 /* 358 * Set by drivers which want cpufreq core to check if CPU is running at a 359 * frequency present in freq-table exposed by the driver. For these drivers if 360 * CPU is found running at an out of table freq, we will try to set it to a freq 361 * from the table. And if that fails, we will stop further boot process by 362 * issuing a BUG_ON(). 363 */ 364 #define CPUFREQ_NEED_INITIAL_FREQ_CHECK (1 << 5) 365 366 int cpufreq_register_driver(struct cpufreq_driver *driver_data); 367 int cpufreq_unregister_driver(struct cpufreq_driver *driver_data); 368 369 const char *cpufreq_get_current_driver(void); 370 void *cpufreq_get_driver_data(void); 371 372 static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy, 373 unsigned int min, unsigned int max) 374 { 375 if (policy->min < min) 376 policy->min = min; 377 if (policy->max < min) 378 policy->max = min; 379 if (policy->min > max) 380 policy->min = max; 381 if (policy->max > max) 382 policy->max = max; 383 if (policy->min > policy->max) 384 policy->min = policy->max; 385 return; 386 } 387 388 static inline void 389 cpufreq_verify_within_cpu_limits(struct cpufreq_policy *policy) 390 { 391 cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, 392 policy->cpuinfo.max_freq); 393 } 394 395 #ifdef CONFIG_CPU_FREQ 396 void cpufreq_suspend(void); 397 void cpufreq_resume(void); 398 int cpufreq_generic_suspend(struct cpufreq_policy *policy); 399 #else 400 static inline void cpufreq_suspend(void) {} 401 static inline void cpufreq_resume(void) {} 402 #endif 403 404 /********************************************************************* 405 * CPUFREQ NOTIFIER INTERFACE * 406 *********************************************************************/ 407 408 #define CPUFREQ_TRANSITION_NOTIFIER (0) 409 #define CPUFREQ_POLICY_NOTIFIER (1) 410 411 /* Transition notifiers */ 412 #define CPUFREQ_PRECHANGE (0) 413 #define CPUFREQ_POSTCHANGE (1) 414 415 /* Policy Notifiers */ 416 #define CPUFREQ_ADJUST (0) 417 #define CPUFREQ_NOTIFY (1) 418 419 #ifdef CONFIG_CPU_FREQ 420 int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list); 421 int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list); 422 423 void cpufreq_freq_transition_begin(struct cpufreq_policy *policy, 424 struct cpufreq_freqs *freqs); 425 void cpufreq_freq_transition_end(struct cpufreq_policy *policy, 426 struct cpufreq_freqs *freqs, int transition_failed); 427 428 #else /* CONFIG_CPU_FREQ */ 429 static inline int cpufreq_register_notifier(struct notifier_block *nb, 430 unsigned int list) 431 { 432 return 0; 433 } 434 static inline int cpufreq_unregister_notifier(struct notifier_block *nb, 435 unsigned int list) 436 { 437 return 0; 438 } 439 #endif /* !CONFIG_CPU_FREQ */ 440 441 /** 442 * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch 443 * safe) 444 * @old: old value 445 * @div: divisor 446 * @mult: multiplier 447 * 448 * 449 * new = old * mult / div 450 */ 451 static inline unsigned long cpufreq_scale(unsigned long old, u_int div, 452 u_int mult) 453 { 454 #if BITS_PER_LONG == 32 455 u64 result = ((u64) old) * ((u64) mult); 456 do_div(result, div); 457 return (unsigned long) result; 458 459 #elif BITS_PER_LONG == 64 460 unsigned long result = old * ((u64) mult); 461 result /= div; 462 return result; 463 #endif 464 } 465 466 /********************************************************************* 467 * CPUFREQ GOVERNORS * 468 *********************************************************************/ 469 470 /* 471 * If (cpufreq_driver->target) exists, the ->governor decides what frequency 472 * within the limits is used. If (cpufreq_driver->setpolicy> exists, these 473 * two generic policies are available: 474 */ 475 #define CPUFREQ_POLICY_POWERSAVE (1) 476 #define CPUFREQ_POLICY_PERFORMANCE (2) 477 478 /* 479 * The polling frequency depends on the capability of the processor. Default 480 * polling frequency is 1000 times the transition latency of the processor. The 481 * ondemand governor will work on any processor with transition latency <= 10ms, 482 * using appropriate sampling rate. 483 * 484 * For CPUs with transition latency > 10ms (mostly drivers with CPUFREQ_ETERNAL) 485 * the ondemand governor will not work. All times here are in us (microseconds). 486 */ 487 #define MIN_SAMPLING_RATE_RATIO (2) 488 #define LATENCY_MULTIPLIER (1000) 489 #define MIN_LATENCY_MULTIPLIER (20) 490 #define TRANSITION_LATENCY_LIMIT (10 * 1000 * 1000) 491 492 struct cpufreq_governor { 493 char name[CPUFREQ_NAME_LEN]; 494 int (*init)(struct cpufreq_policy *policy); 495 void (*exit)(struct cpufreq_policy *policy); 496 int (*start)(struct cpufreq_policy *policy); 497 void (*stop)(struct cpufreq_policy *policy); 498 void (*limits)(struct cpufreq_policy *policy); 499 ssize_t (*show_setspeed) (struct cpufreq_policy *policy, 500 char *buf); 501 int (*store_setspeed) (struct cpufreq_policy *policy, 502 unsigned int freq); 503 unsigned int max_transition_latency; /* HW must be able to switch to 504 next freq faster than this value in nano secs or we 505 will fallback to performance governor */ 506 struct list_head governor_list; 507 struct module *owner; 508 }; 509 510 /* Pass a target to the cpufreq driver */ 511 unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy, 512 unsigned int target_freq); 513 int cpufreq_driver_target(struct cpufreq_policy *policy, 514 unsigned int target_freq, 515 unsigned int relation); 516 int __cpufreq_driver_target(struct cpufreq_policy *policy, 517 unsigned int target_freq, 518 unsigned int relation); 519 unsigned int cpufreq_driver_resolve_freq(struct cpufreq_policy *policy, 520 unsigned int target_freq); 521 int cpufreq_register_governor(struct cpufreq_governor *governor); 522 void cpufreq_unregister_governor(struct cpufreq_governor *governor); 523 524 struct cpufreq_governor *cpufreq_default_governor(void); 525 struct cpufreq_governor *cpufreq_fallback_governor(void); 526 527 static inline void cpufreq_policy_apply_limits(struct cpufreq_policy *policy) 528 { 529 if (policy->max < policy->cur) 530 __cpufreq_driver_target(policy, policy->max, CPUFREQ_RELATION_H); 531 else if (policy->min > policy->cur) 532 __cpufreq_driver_target(policy, policy->min, CPUFREQ_RELATION_L); 533 } 534 535 /* Governor attribute set */ 536 struct gov_attr_set { 537 struct kobject kobj; 538 struct list_head policy_list; 539 struct mutex update_lock; 540 int usage_count; 541 }; 542 543 /* sysfs ops for cpufreq governors */ 544 extern const struct sysfs_ops governor_sysfs_ops; 545 546 void gov_attr_set_init(struct gov_attr_set *attr_set, struct list_head *list_node); 547 void gov_attr_set_get(struct gov_attr_set *attr_set, struct list_head *list_node); 548 unsigned int gov_attr_set_put(struct gov_attr_set *attr_set, struct list_head *list_node); 549 550 /* Governor sysfs attribute */ 551 struct governor_attr { 552 struct attribute attr; 553 ssize_t (*show)(struct gov_attr_set *attr_set, char *buf); 554 ssize_t (*store)(struct gov_attr_set *attr_set, const char *buf, 555 size_t count); 556 }; 557 558 /********************************************************************* 559 * FREQUENCY TABLE HELPERS * 560 *********************************************************************/ 561 562 /* Special Values of .frequency field */ 563 #define CPUFREQ_ENTRY_INVALID ~0u 564 #define CPUFREQ_TABLE_END ~1u 565 /* Special Values of .flags field */ 566 #define CPUFREQ_BOOST_FREQ (1 << 0) 567 568 struct cpufreq_frequency_table { 569 unsigned int flags; 570 unsigned int driver_data; /* driver specific data, not used by core */ 571 unsigned int frequency; /* kHz - doesn't need to be in ascending 572 * order */ 573 }; 574 575 #if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP) 576 int dev_pm_opp_init_cpufreq_table(struct device *dev, 577 struct cpufreq_frequency_table **table); 578 void dev_pm_opp_free_cpufreq_table(struct device *dev, 579 struct cpufreq_frequency_table **table); 580 #else 581 static inline int dev_pm_opp_init_cpufreq_table(struct device *dev, 582 struct cpufreq_frequency_table 583 **table) 584 { 585 return -EINVAL; 586 } 587 588 static inline void dev_pm_opp_free_cpufreq_table(struct device *dev, 589 struct cpufreq_frequency_table 590 **table) 591 { 592 } 593 #endif 594 595 /* 596 * cpufreq_for_each_entry - iterate over a cpufreq_frequency_table 597 * @pos: the cpufreq_frequency_table * to use as a loop cursor. 598 * @table: the cpufreq_frequency_table * to iterate over. 599 */ 600 601 #define cpufreq_for_each_entry(pos, table) \ 602 for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++) 603 604 /* 605 * cpufreq_for_each_valid_entry - iterate over a cpufreq_frequency_table 606 * excluding CPUFREQ_ENTRY_INVALID frequencies. 607 * @pos: the cpufreq_frequency_table * to use as a loop cursor. 608 * @table: the cpufreq_frequency_table * to iterate over. 609 */ 610 611 #define cpufreq_for_each_valid_entry(pos, table) \ 612 for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++) \ 613 if (pos->frequency == CPUFREQ_ENTRY_INVALID) \ 614 continue; \ 615 else 616 617 int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy, 618 struct cpufreq_frequency_table *table); 619 620 int cpufreq_frequency_table_verify(struct cpufreq_policy *policy, 621 struct cpufreq_frequency_table *table); 622 int cpufreq_generic_frequency_table_verify(struct cpufreq_policy *policy); 623 624 int cpufreq_table_index_unsorted(struct cpufreq_policy *policy, 625 unsigned int target_freq, 626 unsigned int relation); 627 int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy, 628 unsigned int freq); 629 630 ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf); 631 632 #ifdef CONFIG_CPU_FREQ 633 int cpufreq_boost_trigger_state(int state); 634 int cpufreq_boost_enabled(void); 635 int cpufreq_enable_boost_support(void); 636 bool policy_has_boost_freq(struct cpufreq_policy *policy); 637 638 /* Find lowest freq at or above target in a table in ascending order */ 639 static inline int cpufreq_table_find_index_al(struct cpufreq_policy *policy, 640 unsigned int target_freq) 641 { 642 struct cpufreq_frequency_table *table = policy->freq_table; 643 struct cpufreq_frequency_table *pos, *best = table - 1; 644 unsigned int freq; 645 646 cpufreq_for_each_valid_entry(pos, table) { 647 freq = pos->frequency; 648 649 if (freq >= target_freq) 650 return pos - table; 651 652 best = pos; 653 } 654 655 return best - table; 656 } 657 658 /* Find lowest freq at or above target in a table in descending order */ 659 static inline int cpufreq_table_find_index_dl(struct cpufreq_policy *policy, 660 unsigned int target_freq) 661 { 662 struct cpufreq_frequency_table *table = policy->freq_table; 663 struct cpufreq_frequency_table *pos, *best = table - 1; 664 unsigned int freq; 665 666 cpufreq_for_each_valid_entry(pos, table) { 667 freq = pos->frequency; 668 669 if (freq == target_freq) 670 return pos - table; 671 672 if (freq > target_freq) { 673 best = pos; 674 continue; 675 } 676 677 /* No freq found above target_freq */ 678 if (best == table - 1) 679 return pos - table; 680 681 return best - table; 682 } 683 684 return best - table; 685 } 686 687 /* Works only on sorted freq-tables */ 688 static inline int cpufreq_table_find_index_l(struct cpufreq_policy *policy, 689 unsigned int target_freq) 690 { 691 target_freq = clamp_val(target_freq, policy->min, policy->max); 692 693 if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING) 694 return cpufreq_table_find_index_al(policy, target_freq); 695 else 696 return cpufreq_table_find_index_dl(policy, target_freq); 697 } 698 699 /* Find highest freq at or below target in a table in ascending order */ 700 static inline int cpufreq_table_find_index_ah(struct cpufreq_policy *policy, 701 unsigned int target_freq) 702 { 703 struct cpufreq_frequency_table *table = policy->freq_table; 704 struct cpufreq_frequency_table *pos, *best = table - 1; 705 unsigned int freq; 706 707 cpufreq_for_each_valid_entry(pos, table) { 708 freq = pos->frequency; 709 710 if (freq == target_freq) 711 return pos - table; 712 713 if (freq < target_freq) { 714 best = pos; 715 continue; 716 } 717 718 /* No freq found below target_freq */ 719 if (best == table - 1) 720 return pos - table; 721 722 return best - table; 723 } 724 725 return best - table; 726 } 727 728 /* Find highest freq at or below target in a table in descending order */ 729 static inline int cpufreq_table_find_index_dh(struct cpufreq_policy *policy, 730 unsigned int target_freq) 731 { 732 struct cpufreq_frequency_table *table = policy->freq_table; 733 struct cpufreq_frequency_table *pos, *best = table - 1; 734 unsigned int freq; 735 736 cpufreq_for_each_valid_entry(pos, table) { 737 freq = pos->frequency; 738 739 if (freq <= target_freq) 740 return pos - table; 741 742 best = pos; 743 } 744 745 return best - table; 746 } 747 748 /* Works only on sorted freq-tables */ 749 static inline int cpufreq_table_find_index_h(struct cpufreq_policy *policy, 750 unsigned int target_freq) 751 { 752 target_freq = clamp_val(target_freq, policy->min, policy->max); 753 754 if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING) 755 return cpufreq_table_find_index_ah(policy, target_freq); 756 else 757 return cpufreq_table_find_index_dh(policy, target_freq); 758 } 759 760 /* Find closest freq to target in a table in ascending order */ 761 static inline int cpufreq_table_find_index_ac(struct cpufreq_policy *policy, 762 unsigned int target_freq) 763 { 764 struct cpufreq_frequency_table *table = policy->freq_table; 765 struct cpufreq_frequency_table *pos, *best = table - 1; 766 unsigned int freq; 767 768 cpufreq_for_each_valid_entry(pos, table) { 769 freq = pos->frequency; 770 771 if (freq == target_freq) 772 return pos - table; 773 774 if (freq < target_freq) { 775 best = pos; 776 continue; 777 } 778 779 /* No freq found below target_freq */ 780 if (best == table - 1) 781 return pos - table; 782 783 /* Choose the closest freq */ 784 if (target_freq - best->frequency > freq - target_freq) 785 return pos - table; 786 787 return best - table; 788 } 789 790 return best - table; 791 } 792 793 /* Find closest freq to target in a table in descending order */ 794 static inline int cpufreq_table_find_index_dc(struct cpufreq_policy *policy, 795 unsigned int target_freq) 796 { 797 struct cpufreq_frequency_table *table = policy->freq_table; 798 struct cpufreq_frequency_table *pos, *best = table - 1; 799 unsigned int freq; 800 801 cpufreq_for_each_valid_entry(pos, table) { 802 freq = pos->frequency; 803 804 if (freq == target_freq) 805 return pos - table; 806 807 if (freq > target_freq) { 808 best = pos; 809 continue; 810 } 811 812 /* No freq found above target_freq */ 813 if (best == table - 1) 814 return pos - table; 815 816 /* Choose the closest freq */ 817 if (best->frequency - target_freq > target_freq - freq) 818 return pos - table; 819 820 return best - table; 821 } 822 823 return best - table; 824 } 825 826 /* Works only on sorted freq-tables */ 827 static inline int cpufreq_table_find_index_c(struct cpufreq_policy *policy, 828 unsigned int target_freq) 829 { 830 target_freq = clamp_val(target_freq, policy->min, policy->max); 831 832 if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING) 833 return cpufreq_table_find_index_ac(policy, target_freq); 834 else 835 return cpufreq_table_find_index_dc(policy, target_freq); 836 } 837 838 static inline int cpufreq_frequency_table_target(struct cpufreq_policy *policy, 839 unsigned int target_freq, 840 unsigned int relation) 841 { 842 if (unlikely(policy->freq_table_sorted == CPUFREQ_TABLE_UNSORTED)) 843 return cpufreq_table_index_unsorted(policy, target_freq, 844 relation); 845 846 switch (relation) { 847 case CPUFREQ_RELATION_L: 848 return cpufreq_table_find_index_l(policy, target_freq); 849 case CPUFREQ_RELATION_H: 850 return cpufreq_table_find_index_h(policy, target_freq); 851 case CPUFREQ_RELATION_C: 852 return cpufreq_table_find_index_c(policy, target_freq); 853 default: 854 pr_err("%s: Invalid relation: %d\n", __func__, relation); 855 return -EINVAL; 856 } 857 } 858 #else 859 static inline int cpufreq_boost_trigger_state(int state) 860 { 861 return 0; 862 } 863 static inline int cpufreq_boost_enabled(void) 864 { 865 return 0; 866 } 867 868 static inline int cpufreq_enable_boost_support(void) 869 { 870 return -EINVAL; 871 } 872 873 static inline bool policy_has_boost_freq(struct cpufreq_policy *policy) 874 { 875 return false; 876 } 877 #endif 878 879 /* the following are really really optional */ 880 extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs; 881 extern struct freq_attr cpufreq_freq_attr_scaling_boost_freqs; 882 extern struct freq_attr *cpufreq_generic_attr[]; 883 int cpufreq_table_validate_and_show(struct cpufreq_policy *policy, 884 struct cpufreq_frequency_table *table); 885 886 unsigned int cpufreq_generic_get(unsigned int cpu); 887 int cpufreq_generic_init(struct cpufreq_policy *policy, 888 struct cpufreq_frequency_table *table, 889 unsigned int transition_latency); 890 #endif /* _LINUX_CPUFREQ_H */ 891