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