drivers/cpufreq/cpufreq_interactive.c

   1 /*
   2  * drivers/cpufreq/cpufreq_interactive.c
   3  *
   4  * Copyright (C) 2010 Google, Inc.
   5  *
   6  * This software is licensed under the terms of the GNU General Public
   7  * License version 2, as published by the Free Software Foundation, and
   8  * may be copied, distributed, and modified under those terms.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * Author: Mike Chan (mike@android.com)
  16  *
  17  */
  18
  19 #include <linux/cpu.h>
  20 #include <linux/cpumask.h>
  21 #include <linux/cpufreq.h>
  22 #ifdef CONFIG_ARCH_ROCKCHIP
  23 #include <linux/input.h>
  24 #endif
  25 #include <linux/module.h>
  26 #include <linux/moduleparam.h>
  27 #include <linux/rwsem.h>
  28 #include <linux/sched.h>
  29 #include <linux/sched/rt.h>
  30 #include <linux/tick.h>
  31 #include <linux/time.h>
  32 #include <linux/timer.h>
  33 #include <linux/workqueue.h>
  34 #include <linux/kthread.h>
  35 #include <linux/slab.h>
  36
  37 #define CREATE_TRACE_POINTS
  38 #include <trace/events/cpufreq_interactive.h>
  39
  40 struct cpufreq_interactive_cpuinfo {
  41         struct timer_list cpu_timer;
  42         struct timer_list cpu_slack_timer;
  43         spinlock_t load_lock; /* protects the next 4 fields */
  44         u64 time_in_idle;
  45         u64 time_in_idle_timestamp;
  46         u64 cputime_speedadj;
  47         u64 cputime_speedadj_timestamp;
  48         struct cpufreq_policy *policy;
  49         struct cpufreq_frequency_table *freq_table;
  50         spinlock_t target_freq_lock; /*protects target freq */
  51         unsigned int target_freq;
  52         unsigned int floor_freq;
  53         u64 pol_floor_val_time; /* policy floor_validate_time */
  54         u64 loc_floor_val_time; /* per-cpu floor_validate_time */
  55         u64 pol_hispeed_val_time; /* policy hispeed_validate_time */
  56         u64 loc_hispeed_val_time; /* per-cpu hispeed_validate_time */
  57         struct rw_semaphore enable_sem;
  58         int governor_enabled;
  59 };
  60
  61 static DEFINE_PER_CPU(struct cpufreq_interactive_cpuinfo, cpuinfo);
  62
  63 /* realtime thread handles frequency scaling */
  64 static struct task_struct *speedchange_task;
  65 static cpumask_t speedchange_cpumask;
  66 static spinlock_t speedchange_cpumask_lock;
  67 static struct mutex gov_lock;
  68
  69 /* Target load.  Lower values result in higher CPU speeds. */
  70 #define DEFAULT_TARGET_LOAD 90
  71 static unsigned int default_target_loads[] = {DEFAULT_TARGET_LOAD};
  72
  73 #define DEFAULT_TIMER_RATE (20 * USEC_PER_MSEC)
  74 #define DEFAULT_ABOVE_HISPEED_DELAY DEFAULT_TIMER_RATE
  75 static unsigned int default_above_hispeed_delay[] = {
  76         DEFAULT_ABOVE_HISPEED_DELAY };
  77
  78 struct cpufreq_interactive_tunables {
  79         int usage_count;
  80         /* Hi speed to bump to from lo speed when load burst (default max) */
  81         unsigned int hispeed_freq;
  82         /* Go to hi speed when CPU load at or above this value. */
  83 #define DEFAULT_GO_HISPEED_LOAD 99
  84         unsigned long go_hispeed_load;
  85         /* Target load. Lower values result in higher CPU speeds. */
  86         spinlock_t target_loads_lock;
  87         unsigned int *target_loads;
  88         int ntarget_loads;
  89         /*
  90          * The minimum amount of time to spend at a frequency before we can ramp
  91          * down.
  92          */
  93 #define DEFAULT_MIN_SAMPLE_TIME (80 * USEC_PER_MSEC)
  94         unsigned long min_sample_time;
  95         /*
  96          * The sample rate of the timer used to increase frequency
  97          */
  98         unsigned long timer_rate;
  99         /*
 100          * Wait this long before raising speed above hispeed, by default a
 101          * single timer interval.
 102          */
 103         spinlock_t above_hispeed_delay_lock;
 104         unsigned int *above_hispeed_delay;
 105         int nabove_hispeed_delay;
 106         /* Non-zero means indefinite speed boost active */
 107         int boost_val;
 108         /* Duration of a boot pulse in usecs */
 109         int boostpulse_duration_val;
 110         /* End time of boost pulse in ktime converted to usecs */
 111         u64 boostpulse_endtime;
 112 #ifdef CONFIG_ARCH_ROCKCHIP
 113         /* Frequency to which a touch boost takes the cpus to */
 114         unsigned long touchboost_freq;
 115         /* Duration of a touchboost pulse in usecs */
 116         int touchboostpulse_duration_val;
 117         /* End time of touchboost pulse in ktime converted to usecs */
 118         u64 touchboostpulse_endtime;
 119 #endif
 120         bool boosted;
 121         /*
 122          * Max additional time to wait in idle, beyond timer_rate, at speeds
 123          * above minimum before wakeup to reduce speed, or -1 if unnecessary.
 124          */
 125 #define DEFAULT_TIMER_SLACK (4 * DEFAULT_TIMER_RATE)
 126         int timer_slack_val;
 127         bool io_is_busy;
 128 };
 129
 130 /* For cases where we have single governor instance for system */
 131 static struct cpufreq_interactive_tunables *common_tunables;
 132
 133 static struct attribute_group *get_sysfs_attr(void);
 134
 135 static void cpufreq_interactive_timer_resched(
 136         struct cpufreq_interactive_cpuinfo *pcpu)
 137 {
 138         struct cpufreq_interactive_tunables *tunables =
 139                 pcpu->policy->governor_data;
 140         unsigned long expires;
 141         unsigned long flags;
 142
 143         spin_lock_irqsave(&pcpu->load_lock, flags);
 144         pcpu->time_in_idle =
 145                 get_cpu_idle_time(smp_processor_id(),
 146                                   &pcpu->time_in_idle_timestamp,
 147                                   tunables->io_is_busy);
 148         pcpu->cputime_speedadj = 0;
 149         pcpu->cputime_speedadj_timestamp = pcpu->time_in_idle_timestamp;
 150         expires = jiffies + usecs_to_jiffies(tunables->timer_rate);
 151         mod_timer_pinned(&pcpu->cpu_timer, expires);
 152
 153         if (tunables->timer_slack_val >= 0 &&
 154             pcpu->target_freq > pcpu->policy->min) {
 155                 expires += usecs_to_jiffies(tunables->timer_slack_val);
 156                 mod_timer_pinned(&pcpu->cpu_slack_timer, expires);
 157         }
 158
 159         spin_unlock_irqrestore(&pcpu->load_lock, flags);
 160 }
 161
 162 /* The caller shall take enable_sem write semaphore to avoid any timer race.
 163  * The cpu_timer and cpu_slack_timer must be deactivated when calling this
 164  * function.
 165  */
 166 static void cpufreq_interactive_timer_start(
 167         struct cpufreq_interactive_tunables *tunables, int cpu)
 168 {
 169         struct cpufreq_interactive_cpuinfo *pcpu = &per_cpu(cpuinfo, cpu);
 170         unsigned long expires = jiffies +
 171                 usecs_to_jiffies(tunables->timer_rate);
 172         unsigned long flags;
 173
 174         pcpu->cpu_timer.expires = expires;
 175         add_timer_on(&pcpu->cpu_timer, cpu);
 176         if (tunables->timer_slack_val >= 0 &&
 177             pcpu->target_freq > pcpu->policy->min) {
 178                 expires += usecs_to_jiffies(tunables->timer_slack_val);
 179                 pcpu->cpu_slack_timer.expires = expires;
 180                 add_timer_on(&pcpu->cpu_slack_timer, cpu);
 181         }
 182
 183         spin_lock_irqsave(&pcpu->load_lock, flags);
 184         pcpu->time_in_idle =
 185                 get_cpu_idle_time(cpu, &pcpu->time_in_idle_timestamp,
 186                                   tunables->io_is_busy);
 187         pcpu->cputime_speedadj = 0;
 188         pcpu->cputime_speedadj_timestamp = pcpu->time_in_idle_timestamp;
 189         spin_unlock_irqrestore(&pcpu->load_lock, flags);
 190 }
 191
 192 static unsigned int freq_to_above_hispeed_delay(
 193         struct cpufreq_interactive_tunables *tunables,
 194         unsigned int freq)
 195 {
 196         int i;
 197         unsigned int ret;
 198         unsigned long flags;
 199
 200         spin_lock_irqsave(&tunables->above_hispeed_delay_lock, flags);
 201
 202         for (i = 0; i < tunables->nabove_hispeed_delay - 1 &&
 203                         freq >= tunables->above_hispeed_delay[i+1]; i += 2)
 204                 ;
 205
 206         ret = tunables->above_hispeed_delay[i];
 207         spin_unlock_irqrestore(&tunables->above_hispeed_delay_lock, flags);
 208         return ret;
 209 }
 210
 211 static unsigned int freq_to_targetload(
 212         struct cpufreq_interactive_tunables *tunables, unsigned int freq)
 213 {
 214         int i;
 215         unsigned int ret;
 216         unsigned long flags;
 217
 218         spin_lock_irqsave(&tunables->target_loads_lock, flags);
 219
 220         for (i = 0; i < tunables->ntarget_loads - 1 &&
 221                     freq >= tunables->target_loads[i+1]; i += 2)
 222                 ;
 223
 224         ret = tunables->target_loads[i];
 225         spin_unlock_irqrestore(&tunables->target_loads_lock, flags);
 226         return ret;
 227 }
 228
 229 /*
 230  * If increasing frequencies never map to a lower target load then
 231  * choose_freq() will find the minimum frequency that does not exceed its
 232  * target load given the current load.
 233  */
 234 static unsigned int choose_freq(struct cpufreq_interactive_cpuinfo *pcpu,
 235                 unsigned int loadadjfreq)
 236 {
 237         unsigned int freq = pcpu->policy->cur;
 238         unsigned int prevfreq, freqmin, freqmax;
 239         unsigned int tl;
 240         int index;
 241
 242         freqmin = 0;
 243         freqmax = UINT_MAX;
 244
 245         do {
 246                 prevfreq = freq;
 247                 tl = freq_to_targetload(pcpu->policy->governor_data, freq);
 248
 249                 /*
 250                  * Find the lowest frequency where the computed load is less
 251                  * than or equal to the target load.
 252                  */
 253
 254                 if (cpufreq_frequency_table_target(
 255                             pcpu->policy, pcpu->freq_table, loadadjfreq / tl,
 256                             CPUFREQ_RELATION_L, &index))
 257                         break;
 258                 freq = pcpu->freq_table[index].frequency;
 259
 260                 if (freq > prevfreq) {
 261                         /* The previous frequency is too low. */
 262                         freqmin = prevfreq;
 263
 264                         if (freq >= freqmax) {
 265                                 /*
 266                                  * Find the highest frequency that is less
 267                                  * than freqmax.
 268                                  */
 269                                 if (cpufreq_frequency_table_target(
 270                                             pcpu->policy, pcpu->freq_table,
 271                                             freqmax - 1, CPUFREQ_RELATION_H,
 272                                             &index))
 273                                         break;
 274                                 freq = pcpu->freq_table[index].frequency;
 275
 276                                 if (freq == freqmin) {
 277                                         /*
 278                                          * The first frequency below freqmax
 279                                          * has already been found to be too
 280                                          * low.  freqmax is the lowest speed
 281                                          * we found that is fast enough.
 282                                          */
 283                                         freq = freqmax;
 284                                         break;
 285                                 }
 286                         }
 287                 } else if (freq < prevfreq) {
 288                         /* The previous frequency is high enough. */
 289                         freqmax = prevfreq;
 290
 291                         if (freq <= freqmin) {
 292                                 /*
 293                                  * Find the lowest frequency that is higher
 294                                  * than freqmin.
 295                                  */
 296                                 if (cpufreq_frequency_table_target(
 297                                             pcpu->policy, pcpu->freq_table,
 298                                             freqmin + 1, CPUFREQ_RELATION_L,
 299                                             &index))
 300                                         break;
 301                                 freq = pcpu->freq_table[index].frequency;
 302
 303                                 /*
 304                                  * If freqmax is the first frequency above
 305                                  * freqmin then we have already found that
 306                                  * this speed is fast enough.
 307                                  */
 308                                 if (freq == freqmax)
 309                                         break;
 310                         }
 311                 }
 312
 313                 /* If same frequency chosen as previous then done. */
 314         } while (freq != prevfreq);
 315
 316         return freq;
 317 }
 318
 319 static u64 update_load(int cpu)
 320 {
 321         struct cpufreq_interactive_cpuinfo *pcpu = &per_cpu(cpuinfo, cpu);
 322         struct cpufreq_interactive_tunables *tunables =
 323                 pcpu->policy->governor_data;
 324         u64 now;
 325         u64 now_idle;
 326         unsigned int delta_idle;
 327         unsigned int delta_time;
 328         u64 active_time;
 329
 330         now_idle = get_cpu_idle_time(cpu, &now, tunables->io_is_busy);
 331         delta_idle = (unsigned int)(now_idle - pcpu->time_in_idle);
 332         delta_time = (unsigned int)(now - pcpu->time_in_idle_timestamp);
 333
 334         if (delta_time <= delta_idle)
 335                 active_time = 0;
 336         else
 337                 active_time = delta_time - delta_idle;
 338
 339         pcpu->cputime_speedadj += active_time * pcpu->policy->cur;
 340
 341         pcpu->time_in_idle = now_idle;
 342         pcpu->time_in_idle_timestamp = now;
 343         return now;
 344 }
 345
 346 static void cpufreq_interactive_timer(unsigned long data)
 347 {
 348         u64 now;
 349         unsigned int delta_time;
 350         u64 cputime_speedadj;
 351         int cpu_load;
 352         struct cpufreq_interactive_cpuinfo *pcpu =
 353                 &per_cpu(cpuinfo, data);
 354         struct cpufreq_interactive_tunables *tunables =
 355                 pcpu->policy->governor_data;
 356         unsigned int new_freq;
 357         unsigned int loadadjfreq;
 358         unsigned int index;
 359         unsigned long flags;
 360         u64 max_fvtime;
 361
 362         if (!down_read_trylock(&pcpu->enable_sem))
 363                 return;
 364         if (!pcpu->governor_enabled)
 365                 goto exit;
 366
 367         spin_lock_irqsave(&pcpu->load_lock, flags);
 368         now = update_load(data);
 369         delta_time = (unsigned int)(now - pcpu->cputime_speedadj_timestamp);
 370         cputime_speedadj = pcpu->cputime_speedadj;
 371         spin_unlock_irqrestore(&pcpu->load_lock, flags);
 372
 373         if (WARN_ON_ONCE(!delta_time))
 374                 goto rearm;
 375
 376         spin_lock_irqsave(&pcpu->target_freq_lock, flags);
 377         do_div(cputime_speedadj, delta_time);
 378         loadadjfreq = (unsigned int)cputime_speedadj * 100;
 379         cpu_load = loadadjfreq / pcpu->policy->cur;
 380         tunables->boosted = tunables->boost_val || now < tunables->boostpulse_endtime;
 381
 382         if (cpu_load >= tunables->go_hispeed_load || tunables->boosted) {
 383                 if (pcpu->policy->cur < tunables->hispeed_freq) {
 384                         new_freq = tunables->hispeed_freq;
 385                 } else {
 386                         new_freq = choose_freq(pcpu, loadadjfreq);
 387
 388                         if (new_freq < tunables->hispeed_freq)
 389                                 new_freq = tunables->hispeed_freq;
 390                 }
 391         } else {
 392                 new_freq = choose_freq(pcpu, loadadjfreq);
 393                 if (new_freq > tunables->hispeed_freq &&
 394                                 pcpu->policy->cur < tunables->hispeed_freq)
 395                         new_freq = tunables->hispeed_freq;
 396         }
 397 #ifdef CONFIG_ARCH_ROCKCHIP
 398         if ((now < tunables->touchboostpulse_endtime) &&
 399             (new_freq < tunables->touchboost_freq)) {
 400                 new_freq = tunables->touchboost_freq;
 401         }
 402 #endif
 403         if (pcpu->policy->cur >= tunables->hispeed_freq &&
 404             new_freq > pcpu->policy->cur &&
 405             now - pcpu->pol_hispeed_val_time <
 406             freq_to_above_hispeed_delay(tunables, pcpu->policy->cur)) {
 407                 trace_cpufreq_interactive_notyet(
 408                         data, cpu_load, pcpu->target_freq,
 409                         pcpu->policy->cur, new_freq);
 410                 spin_unlock_irqrestore(&pcpu->target_freq_lock, flags);
 411                 goto rearm;
 412         }
 413
 414         pcpu->loc_hispeed_val_time = now;
 415
 416         if (cpufreq_frequency_table_target(pcpu->policy, pcpu->freq_table,
 417                                            new_freq, CPUFREQ_RELATION_L,
 418                                            &index)) {
 419                 spin_unlock_irqrestore(&pcpu->target_freq_lock, flags);
 420                 goto rearm;
 421         }
 422
 423         new_freq = pcpu->freq_table[index].frequency;
 424
 425         /*
 426          * Do not scale below floor_freq unless we have been at or above the
 427          * floor frequency for the minimum sample time since last validated.
 428          */
 429         max_fvtime = max(pcpu->pol_floor_val_time, pcpu->loc_floor_val_time);
 430         if (new_freq < pcpu->floor_freq &&
 431             pcpu->target_freq >= pcpu->policy->cur) {
 432                 if (now - max_fvtime < tunables->min_sample_time) {
 433                         trace_cpufreq_interactive_notyet(
 434                                 data, cpu_load, pcpu->target_freq,
 435                                 pcpu->policy->cur, new_freq);
 436                         spin_unlock_irqrestore(&pcpu->target_freq_lock, flags);
 437                         goto rearm;
 438                 }
 439         }
 440
 441         /*
 442          * Update the timestamp for checking whether speed has been held at
 443          * or above the selected frequency for a minimum of min_sample_time,
 444          * if not boosted to hispeed_freq.  If boosted to hispeed_freq then we
 445          * allow the speed to drop as soon as the boostpulse duration expires
 446          * (or the indefinite boost is turned off).
 447          */
 448
 449         if (!tunables->boosted || new_freq > tunables->hispeed_freq) {
 450                 pcpu->floor_freq = new_freq;
 451                 if (pcpu->target_freq >= pcpu->policy->cur ||
 452                     new_freq >= pcpu->policy->cur)
 453                         pcpu->loc_floor_val_time = now;
 454         }
 455
 456         if (pcpu->target_freq == new_freq &&
 457                         pcpu->target_freq <= pcpu->policy->cur) {
 458                 trace_cpufreq_interactive_already(
 459                         data, cpu_load, pcpu->target_freq,
 460                         pcpu->policy->cur, new_freq);
 461                 spin_unlock_irqrestore(&pcpu->target_freq_lock, flags);
 462                 goto rearm;
 463         }
 464
 465         trace_cpufreq_interactive_target(data, cpu_load, pcpu->target_freq,
 466                                          pcpu->policy->cur, new_freq);
 467
 468         pcpu->target_freq = new_freq;
 469         spin_unlock_irqrestore(&pcpu->target_freq_lock, flags);
 470         spin_lock_irqsave(&speedchange_cpumask_lock, flags);
 471         cpumask_set_cpu(data, &speedchange_cpumask);
 472         spin_unlock_irqrestore(&speedchange_cpumask_lock, flags);
 473         wake_up_process(speedchange_task);
 474
 475 rearm:
 476         if (!timer_pending(&pcpu->cpu_timer))
 477                 cpufreq_interactive_timer_resched(pcpu);
 478
 479 exit:
 480         up_read(&pcpu->enable_sem);
 481         return;
 482 }
 483
 484 static void cpufreq_interactive_idle_end(void)
 485 {
 486         struct cpufreq_interactive_cpuinfo *pcpu =
 487                 &per_cpu(cpuinfo, smp_processor_id());
 488
 489         if (!down_read_trylock(&pcpu->enable_sem))
 490                 return;
 491         if (!pcpu->governor_enabled) {
 492                 up_read(&pcpu->enable_sem);
 493                 return;
 494         }
 495
 496         /* Arm the timer for 1-2 ticks later if not already. */
 497         if (!timer_pending(&pcpu->cpu_timer)) {
 498                 cpufreq_interactive_timer_resched(pcpu);
 499         } else if (time_after_eq(jiffies, pcpu->cpu_timer.expires)) {
 500                 del_timer(&pcpu->cpu_timer);
 501                 del_timer(&pcpu->cpu_slack_timer);
 502                 cpufreq_interactive_timer(smp_processor_id());
 503         }
 504
 505         up_read(&pcpu->enable_sem);
 506 }
 507
 508 static void cpufreq_interactive_get_policy_info(struct cpufreq_policy *policy,
 509                                                 unsigned int *pmax_freq,
 510                                                 u64 *phvt, u64 *pfvt)
 511 {
 512         struct cpufreq_interactive_cpuinfo *pcpu;
 513         unsigned int max_freq = 0;
 514         u64 hvt = ~0ULL, fvt = 0;
 515         unsigned int i;
 516
 517         for_each_cpu(i, policy->cpus) {
 518                 pcpu = &per_cpu(cpuinfo, i);
 519
 520                 fvt = max(fvt, pcpu->loc_floor_val_time);
 521                 if (pcpu->target_freq > max_freq) {
 522                         max_freq = pcpu->target_freq;
 523                         hvt = pcpu->loc_hispeed_val_time;
 524                 } else if (pcpu->target_freq == max_freq) {
 525                         hvt = min(hvt, pcpu->loc_hispeed_val_time);
 526                 }
 527         }
 528
 529         *pmax_freq = max_freq;
 530         *phvt = hvt;
 531         *pfvt = fvt;
 532 }
 533
 534 static void cpufreq_interactive_adjust_cpu(unsigned int cpu,
 535                                            struct cpufreq_policy *policy)
 536 {
 537         struct cpufreq_interactive_cpuinfo *pcpu;
 538         u64 hvt, fvt;
 539         unsigned int max_freq;
 540         int i;
 541
 542         cpufreq_interactive_get_policy_info(policy, &max_freq, &hvt, &fvt);
 543
 544         for_each_cpu(i, policy->cpus) {
 545                 pcpu = &per_cpu(cpuinfo, i);
 546                 pcpu->pol_floor_val_time = fvt;
 547         }
 548
 549         if (max_freq != policy->cur) {
 550                 __cpufreq_driver_target(policy, max_freq, CPUFREQ_RELATION_H);
 551                 for_each_cpu(i, policy->cpus) {
 552                         pcpu = &per_cpu(cpuinfo, i);
 553                         pcpu->pol_hispeed_val_time = hvt;
 554                 }
 555         }
 556
 557         trace_cpufreq_interactive_setspeed(cpu, max_freq, policy->cur);
 558 }
 559
 560 static int cpufreq_interactive_speedchange_task(void *data)
 561 {
 562         unsigned int cpu;
 563         cpumask_t tmp_mask;
 564         unsigned long flags;
 565         struct cpufreq_interactive_cpuinfo *pcpu;
 566
 567         while (1) {
 568                 set_current_state(TASK_INTERRUPTIBLE);
 569                 spin_lock_irqsave(&speedchange_cpumask_lock, flags);
 570
 571                 if (cpumask_empty(&speedchange_cpumask)) {
 572                         spin_unlock_irqrestore(&speedchange_cpumask_lock,
 573                                                flags);
 574                         schedule();
 575
 576                         if (kthread_should_stop())
 577                                 break;
 578
 579                         spin_lock_irqsave(&speedchange_cpumask_lock, flags);
 580                 }
 581
 582                 set_current_state(TASK_RUNNING);
 583                 tmp_mask = speedchange_cpumask;
 584                 cpumask_clear(&speedchange_cpumask);
 585                 spin_unlock_irqrestore(&speedchange_cpumask_lock, flags);
 586
 587                 for_each_cpu(cpu, &tmp_mask) {
 588                         pcpu = &per_cpu(cpuinfo, cpu);
 589
 590                         down_write(&pcpu->policy->rwsem);
 591
 592                         if (likely(down_read_trylock(&pcpu->enable_sem))) {
 593                                 if (likely(pcpu->governor_enabled))
 594                                         cpufreq_interactive_adjust_cpu(cpu,
 595                                                         pcpu->policy);
 596                                 up_read(&pcpu->enable_sem);
 597                         }
 598
 599                         up_write(&pcpu->policy->rwsem);
 600                 }
 601         }
 602
 603         return 0;
 604 }
 605
 606 static void cpufreq_interactive_boost(struct cpufreq_interactive_tunables *tunables)
 607 {
 608         int i;
 609         int anyboost = 0;
 610         unsigned long flags[2];
 611         struct cpufreq_interactive_cpuinfo *pcpu;
 612
 613         tunables->boosted = true;
 614
 615         spin_lock_irqsave(&speedchange_cpumask_lock, flags[0]);
 616
 617         for_each_online_cpu(i) {
 618                 pcpu = &per_cpu(cpuinfo, i);
 619
 620                 if (!down_read_trylock(&pcpu->enable_sem))
 621                         continue;
 622
 623                 if (!pcpu->governor_enabled) {
 624                         up_read(&pcpu->enable_sem);
 625                         continue;
 626                 }
 627
 628                 if (tunables != pcpu->policy->governor_data) {
 629                         up_read(&pcpu->enable_sem);
 630                         continue;
 631                 }
 632
 633                 spin_lock_irqsave(&pcpu->target_freq_lock, flags[1]);
 634                 if (pcpu->target_freq < tunables->hispeed_freq) {
 635                         pcpu->target_freq = tunables->hispeed_freq;
 636                         cpumask_set_cpu(i, &speedchange_cpumask);
 637                         pcpu->pol_hispeed_val_time =
 638                                 ktime_to_us(ktime_get());
 639                         anyboost = 1;
 640                 }
 641                 spin_unlock_irqrestore(&pcpu->target_freq_lock, flags[1]);
 642
 643                 up_read(&pcpu->enable_sem);
 644         }
 645
 646         spin_unlock_irqrestore(&speedchange_cpumask_lock, flags[0]);
 647
 648         if (anyboost)
 649                 wake_up_process(speedchange_task);
 650 }
 651
 652 static int cpufreq_interactive_notifier(
 653         struct notifier_block *nb, unsigned long val, void *data)
 654 {
 655         struct cpufreq_freqs *freq = data;
 656         struct cpufreq_interactive_cpuinfo *pcpu;
 657         int cpu;
 658         unsigned long flags;
 659
 660         if (val == CPUFREQ_POSTCHANGE) {
 661                 pcpu = &per_cpu(cpuinfo, freq->cpu);
 662                 if (!down_read_trylock(&pcpu->enable_sem))
 663                         return 0;
 664                 if (!pcpu->governor_enabled) {
 665                         up_read(&pcpu->enable_sem);
 666                         return 0;
 667                 }
 668
 669                 for_each_cpu(cpu, pcpu->policy->cpus) {
 670                         struct cpufreq_interactive_cpuinfo *pjcpu =
 671                                 &per_cpu(cpuinfo, cpu);
 672                         if (cpu != freq->cpu) {
 673                                 if (!down_read_trylock(&pjcpu->enable_sem))
 674                                         continue;
 675                                 if (!pjcpu->governor_enabled) {
 676                                         up_read(&pjcpu->enable_sem);
 677                                         continue;
 678                                 }
 679                         }
 680                         spin_lock_irqsave(&pjcpu->load_lock, flags);
 681                         update_load(cpu);
 682                         spin_unlock_irqrestore(&pjcpu->load_lock, flags);
 683                         if (cpu != freq->cpu)
 684                                 up_read(&pjcpu->enable_sem);
 685                 }
 686
 687                 up_read(&pcpu->enable_sem);
 688         }
 689         return 0;
 690 }
 691
 692 static struct notifier_block cpufreq_notifier_block = {
 693         .notifier_call = cpufreq_interactive_notifier,
 694 };
 695
 696 static unsigned int *get_tokenized_data(const char *buf, int *num_tokens)
 697 {
 698         const char *cp;
 699         int i;
 700         int ntokens = 1;
 701         unsigned int *tokenized_data;
 702         int err = -EINVAL;
 703
 704         cp = buf;
 705         while ((cp = strpbrk(cp + 1, " :")))
 706                 ntokens++;
 707
 708         if (!(ntokens & 0x1))
 709                 goto err;
 710
 711         tokenized_data = kmalloc(ntokens * sizeof(unsigned int), GFP_KERNEL);
 712         if (!tokenized_data) {
 713                 err = -ENOMEM;
 714                 goto err;
 715         }
 716
 717         cp = buf;
 718         i = 0;
 719         while (i < ntokens) {
 720                 if (sscanf(cp, "%u", &tokenized_data[i++]) != 1)
 721                         goto err_kfree;
 722
 723                 cp = strpbrk(cp, " :");
 724                 if (!cp)
 725                         break;
 726                 cp++;
 727         }
 728
 729         if (i != ntokens)
 730                 goto err_kfree;
 731
 732         *num_tokens = ntokens;
 733         return tokenized_data;
 734
 735 err_kfree:
 736         kfree(tokenized_data);
 737 err:
 738         return ERR_PTR(err);
 739 }
 740
 741 static ssize_t show_target_loads(
 742         struct cpufreq_interactive_tunables *tunables,
 743         char *buf)
 744 {
 745         int i;
 746         ssize_t ret = 0;
 747         unsigned long flags;
 748
 749         spin_lock_irqsave(&tunables->target_loads_lock, flags);
 750
 751         for (i = 0; i < tunables->ntarget_loads; i++)
 752                 ret += sprintf(buf + ret, "%u%s", tunables->target_loads[i],
 753                                i & 0x1 ? ":" : " ");
 754
 755         sprintf(buf + ret - 1, "\n");
 756         spin_unlock_irqrestore(&tunables->target_loads_lock, flags);
 757         return ret;
 758 }
 759
 760 static ssize_t store_target_loads(
 761         struct cpufreq_interactive_tunables *tunables,
 762         const char *buf, size_t count)
 763 {
 764         int ntokens;
 765         unsigned int *new_target_loads = NULL;
 766         unsigned long flags;
 767
 768         new_target_loads = get_tokenized_data(buf, &ntokens);
 769         if (IS_ERR(new_target_loads))
 770                 return PTR_RET(new_target_loads);
 771
 772         spin_lock_irqsave(&tunables->target_loads_lock, flags);
 773         if (tunables->target_loads != default_target_loads)
 774                 kfree(tunables->target_loads);
 775         tunables->target_loads = new_target_loads;
 776         tunables->ntarget_loads = ntokens;
 777         spin_unlock_irqrestore(&tunables->target_loads_lock, flags);
 778         return count;
 779 }
 780
 781 static ssize_t show_above_hispeed_delay(
 782         struct cpufreq_interactive_tunables *tunables, char *buf)
 783 {
 784         int i;
 785         ssize_t ret = 0;
 786         unsigned long flags;
 787
 788         spin_lock_irqsave(&tunables->above_hispeed_delay_lock, flags);
 789
 790         for (i = 0; i < tunables->nabove_hispeed_delay; i++)
 791                 ret += sprintf(buf + ret, "%u%s",
 792                                tunables->above_hispeed_delay[i],
 793                                i & 0x1 ? ":" : " ");
 794
 795         sprintf(buf + ret - 1, "\n");
 796         spin_unlock_irqrestore(&tunables->above_hispeed_delay_lock, flags);
 797         return ret;
 798 }
 799
 800 static ssize_t store_above_hispeed_delay(
 801         struct cpufreq_interactive_tunables *tunables,
 802         const char *buf, size_t count)
 803 {
 804         int ntokens;
 805         unsigned int *new_above_hispeed_delay = NULL;
 806         unsigned long flags;
 807
 808         new_above_hispeed_delay = get_tokenized_data(buf, &ntokens);
 809         if (IS_ERR(new_above_hispeed_delay))
 810                 return PTR_RET(new_above_hispeed_delay);
 811
 812         spin_lock_irqsave(&tunables->above_hispeed_delay_lock, flags);
 813         if (tunables->above_hispeed_delay != default_above_hispeed_delay)
 814                 kfree(tunables->above_hispeed_delay);
 815         tunables->above_hispeed_delay = new_above_hispeed_delay;
 816         tunables->nabove_hispeed_delay = ntokens;
 817         spin_unlock_irqrestore(&tunables->above_hispeed_delay_lock, flags);
 818         return count;
 819
 820 }
 821
 822 static ssize_t show_hispeed_freq(struct cpufreq_interactive_tunables *tunables,
 823                 char *buf)
 824 {
 825         return sprintf(buf, "%u\n", tunables->hispeed_freq);
 826 }
 827
 828 static ssize_t store_hispeed_freq(struct cpufreq_interactive_tunables *tunables,
 829                 const char *buf, size_t count)
 830 {
 831         int ret;
 832         long unsigned int val;
 833
 834         ret = kstrtoul(buf, 0, &val);
 835         if (ret < 0)
 836                 return ret;
 837         tunables->hispeed_freq = val;
 838         return count;
 839 }
 840
 841 static ssize_t show_go_hispeed_load(struct cpufreq_interactive_tunables
 842                 *tunables, char *buf)
 843 {
 844         return sprintf(buf, "%lu\n", tunables->go_hispeed_load);
 845 }
 846
 847 static ssize_t store_go_hispeed_load(struct cpufreq_interactive_tunables
 848                 *tunables, const char *buf, size_t count)
 849 {
 850         int ret;
 851         unsigned long val;
 852
 853         ret = kstrtoul(buf, 0, &val);
 854         if (ret < 0)
 855                 return ret;
 856         tunables->go_hispeed_load = val;
 857         return count;
 858 }
 859
 860 static ssize_t show_min_sample_time(struct cpufreq_interactive_tunables
 861                 *tunables, char *buf)
 862 {
 863         return sprintf(buf, "%lu\n", tunables->min_sample_time);
 864 }
 865
 866 static ssize_t store_min_sample_time(struct cpufreq_interactive_tunables
 867                 *tunables, const char *buf, size_t count)
 868 {
 869         int ret;
 870         unsigned long val;
 871
 872         ret = kstrtoul(buf, 0, &val);
 873         if (ret < 0)
 874                 return ret;
 875         tunables->min_sample_time = val;
 876         return count;
 877 }
 878
 879 static ssize_t show_timer_rate(struct cpufreq_interactive_tunables *tunables,
 880                 char *buf)
 881 {
 882         return sprintf(buf, "%lu\n", tunables->timer_rate);
 883 }
 884
 885 static ssize_t store_timer_rate(struct cpufreq_interactive_tunables *tunables,
 886                 const char *buf, size_t count)
 887 {
 888         int ret;
 889         unsigned long val, val_round;
 890
 891         ret = kstrtoul(buf, 0, &val);
 892         if (ret < 0)
 893                 return ret;
 894
 895         val_round = jiffies_to_usecs(usecs_to_jiffies(val));
 896         if (val != val_round)
 897                 pr_warn("timer_rate not aligned to jiffy. Rounded up to %lu\n",
 898                         val_round);
 899
 900         tunables->timer_rate = val_round;
 901         return count;
 902 }
 903
 904 static ssize_t show_timer_slack(struct cpufreq_interactive_tunables *tunables,
 905                 char *buf)
 906 {
 907         return sprintf(buf, "%d\n", tunables->timer_slack_val);
 908 }
 909
 910 static ssize_t store_timer_slack(struct cpufreq_interactive_tunables *tunables,
 911                 const char *buf, size_t count)
 912 {
 913         int ret;
 914         unsigned long val;
 915
 916         ret = kstrtol(buf, 10, &val);
 917         if (ret < 0)
 918                 return ret;
 919
 920         tunables->timer_slack_val = val;
 921         return count;
 922 }
 923
 924 static ssize_t show_boost(struct cpufreq_interactive_tunables *tunables,
 925                           char *buf)
 926 {
 927         return sprintf(buf, "%d\n", tunables->boost_val);
 928 }
 929
 930 static ssize_t store_boost(struct cpufreq_interactive_tunables *tunables,
 931                            const char *buf, size_t count)
 932 {
 933         int ret;
 934         unsigned long val;
 935
 936         ret = kstrtoul(buf, 0, &val);
 937         if (ret < 0)
 938                 return ret;
 939
 940         tunables->boost_val = val;
 941
 942         if (tunables->boost_val) {
 943                 trace_cpufreq_interactive_boost("on");
 944                 if (!tunables->boosted)
 945                         cpufreq_interactive_boost(tunables);
 946         } else {
 947                 tunables->boostpulse_endtime = ktime_to_us(ktime_get());
 948                 trace_cpufreq_interactive_unboost("off");
 949         }
 950
 951         return count;
 952 }
 953
 954 static ssize_t store_boostpulse(struct cpufreq_interactive_tunables *tunables,
 955                                 const char *buf, size_t count)
 956 {
 957         int ret;
 958         unsigned long val;
 959
 960         ret = kstrtoul(buf, 0, &val);
 961         if (ret < 0)
 962                 return ret;
 963
 964         tunables->boostpulse_endtime = ktime_to_us(ktime_get()) +
 965                 tunables->boostpulse_duration_val;
 966         trace_cpufreq_interactive_boost("pulse");
 967         if (!tunables->boosted)
 968                 cpufreq_interactive_boost(tunables);
 969         return count;
 970 }
 971
 972 static ssize_t show_boostpulse_duration(struct cpufreq_interactive_tunables
 973                 *tunables, char *buf)
 974 {
 975         return sprintf(buf, "%d\n", tunables->boostpulse_duration_val);
 976 }
 977
 978 static ssize_t store_boostpulse_duration(struct cpufreq_interactive_tunables
 979                 *tunables, const char *buf, size_t count)
 980 {
 981         int ret;
 982         unsigned long val;
 983
 984         ret = kstrtoul(buf, 0, &val);
 985         if (ret < 0)
 986                 return ret;
 987
 988         tunables->boostpulse_duration_val = val;
 989         return count;
 990 }
 991
 992 static ssize_t show_io_is_busy(struct cpufreq_interactive_tunables *tunables,
 993                 char *buf)
 994 {
 995         return sprintf(buf, "%u\n", tunables->io_is_busy);
 996 }
 997
 998 static ssize_t store_io_is_busy(struct cpufreq_interactive_tunables *tunables,
 999                 const char *buf, size_t count)
1000 {
1001         int ret;
1002         unsigned long val;
1003
1004         ret = kstrtoul(buf, 0, &val);
1005         if (ret < 0)
1006                 return ret;
1007         tunables->io_is_busy = val;
1008         return count;
1009 }
1010
1011 /*
1012  * Create show/store routines
1013  * - sys: One governor instance for complete SYSTEM
1014  * - pol: One governor instance per struct cpufreq_policy
1015  */
1016 #define show_gov_pol_sys(file_name)                                     \
1017 static ssize_t show_##file_name##_gov_sys                               \
1018 (struct kobject *kobj, struct attribute *attr, char *buf)               \
1019 {                                                                       \
1020         return show_##file_name(common_tunables, buf);                  \
1021 }                                                                       \
1022                                                                         \
1023 static ssize_t show_##file_name##_gov_pol                               \
1024 (struct cpufreq_policy *policy, char *buf)                              \
1025 {                                                                       \
1026         return show_##file_name(policy->governor_data, buf);            \
1027 }
1028
1029 #define store_gov_pol_sys(file_name)                                    \
1030 static ssize_t store_##file_name##_gov_sys                              \
1031 (struct kobject *kobj, struct attribute *attr, const char *buf,         \
1032         size_t count)                                                   \
1033 {                                                                       \
1034         return store_##file_name(common_tunables, buf, count);          \
1035 }                                                                       \
1036                                                                         \
1037 static ssize_t store_##file_name##_gov_pol                              \
1038 (struct cpufreq_policy *policy, const char *buf, size_t count)          \
1039 {                                                                       \
1040         return store_##file_name(policy->governor_data, buf, count);    \
1041 }
1042
1043 #define show_store_gov_pol_sys(file_name)                               \
1044 show_gov_pol_sys(file_name);                                            \
1045 store_gov_pol_sys(file_name)
1046
1047 show_store_gov_pol_sys(target_loads);
1048 show_store_gov_pol_sys(above_hispeed_delay);
1049 show_store_gov_pol_sys(hispeed_freq);
1050 show_store_gov_pol_sys(go_hispeed_load);
1051 show_store_gov_pol_sys(min_sample_time);
1052 show_store_gov_pol_sys(timer_rate);
1053 show_store_gov_pol_sys(timer_slack);
1054 show_store_gov_pol_sys(boost);
1055 store_gov_pol_sys(boostpulse);
1056 show_store_gov_pol_sys(boostpulse_duration);
1057 show_store_gov_pol_sys(io_is_busy);
1058
1059 #define gov_sys_attr_rw(_name)                                          \
1060 static struct global_attr _name##_gov_sys =                             \
1061 __ATTR(_name, 0644, show_##_name##_gov_sys, store_##_name##_gov_sys)
1062
1063 #define gov_pol_attr_rw(_name)                                          \
1064 static struct freq_attr _name##_gov_pol =                               \
1065 __ATTR(_name, 0644, show_##_name##_gov_pol, store_##_name##_gov_pol)
1066
1067 #define gov_sys_pol_attr_rw(_name)                                      \
1068         gov_sys_attr_rw(_name);                                         \
1069         gov_pol_attr_rw(_name)
1070
1071 gov_sys_pol_attr_rw(target_loads);
1072 gov_sys_pol_attr_rw(above_hispeed_delay);
1073 gov_sys_pol_attr_rw(hispeed_freq);
1074 gov_sys_pol_attr_rw(go_hispeed_load);
1075 gov_sys_pol_attr_rw(min_sample_time);
1076 gov_sys_pol_attr_rw(timer_rate);
1077 gov_sys_pol_attr_rw(timer_slack);
1078 gov_sys_pol_attr_rw(boost);
1079 gov_sys_pol_attr_rw(boostpulse_duration);
1080 gov_sys_pol_attr_rw(io_is_busy);
1081
1082 static struct global_attr boostpulse_gov_sys =
1083         __ATTR(boostpulse, 0200, NULL, store_boostpulse_gov_sys);
1084
1085 static struct freq_attr boostpulse_gov_pol =
1086         __ATTR(boostpulse, 0200, NULL, store_boostpulse_gov_pol);
1087
1088 /* One Governor instance for entire system */
1089 static struct attribute *interactive_attributes_gov_sys[] = {
1090         &target_loads_gov_sys.attr,
1091         &above_hispeed_delay_gov_sys.attr,
1092         &hispeed_freq_gov_sys.attr,
1093         &go_hispeed_load_gov_sys.attr,
1094         &min_sample_time_gov_sys.attr,
1095         &timer_rate_gov_sys.attr,
1096         &timer_slack_gov_sys.attr,
1097         &boost_gov_sys.attr,
1098         &boostpulse_gov_sys.attr,
1099         &boostpulse_duration_gov_sys.attr,
1100         &io_is_busy_gov_sys.attr,
1101         NULL,
1102 };
1103
1104 static struct attribute_group interactive_attr_group_gov_sys = {
1105         .attrs = interactive_attributes_gov_sys,
1106         .name = "interactive",
1107 };
1108
1109 /* Per policy governor instance */
1110 static struct attribute *interactive_attributes_gov_pol[] = {
1111         &target_loads_gov_pol.attr,
1112         &above_hispeed_delay_gov_pol.attr,
1113         &hispeed_freq_gov_pol.attr,
1114         &go_hispeed_load_gov_pol.attr,
1115         &min_sample_time_gov_pol.attr,
1116         &timer_rate_gov_pol.attr,
1117         &timer_slack_gov_pol.attr,
1118         &boost_gov_pol.attr,
1119         &boostpulse_gov_pol.attr,
1120         &boostpulse_duration_gov_pol.attr,
1121         &io_is_busy_gov_pol.attr,
1122         NULL,
1123 };
1124
1125 static struct attribute_group interactive_attr_group_gov_pol = {
1126         .attrs = interactive_attributes_gov_pol,
1127         .name = "interactive",
1128 };
1129
1130 static struct attribute_group *get_sysfs_attr(void)
1131 {
1132         if (have_governor_per_policy())
1133                 return &interactive_attr_group_gov_pol;
1134         else
1135                 return &interactive_attr_group_gov_sys;
1136 }
1137
1138 static int cpufreq_interactive_idle_notifier(struct notifier_block *nb,
1139                                              unsigned long val,
1140                                              void *data)
1141 {
1142         if (val == IDLE_END)
1143                 cpufreq_interactive_idle_end();
1144
1145         return 0;
1146 }
1147
1148 static struct notifier_block cpufreq_interactive_idle_nb = {
1149         .notifier_call = cpufreq_interactive_idle_notifier,
1150 };
1151
1152 #ifdef CONFIG_ARCH_ROCKCHIP
1153 static void cpufreq_interactive_input_event(struct input_handle *handle,
1154                                             unsigned int type,
1155                                             unsigned int code,
1156                                             int value)
1157 {
1158         u64 now, endtime;
1159         int i;
1160         int anyboost = 0;
1161         unsigned long flags[2];
1162         struct cpufreq_interactive_cpuinfo *pcpu;
1163         struct cpufreq_interactive_tunables *tunables;
1164
1165         if ((type != EV_ABS) && (type != EV_KEY))
1166                 return;
1167
1168         trace_cpufreq_interactive_boost("touch");
1169         spin_lock_irqsave(&speedchange_cpumask_lock, flags[0]);
1170
1171         now = ktime_to_us(ktime_get());
1172         for_each_online_cpu(i) {
1173                 pcpu = &per_cpu(cpuinfo, i);
1174                 if (have_governor_per_policy())
1175                         tunables = pcpu->policy->governor_data;
1176                 else
1177                         tunables = common_tunables;
1178                 if (!tunables)
1179                         continue;
1180
1181                 endtime = now + tunables->touchboostpulse_duration_val;
1182                 if (endtime < (tunables->touchboostpulse_endtime +
1183                                10 * USEC_PER_MSEC))
1184                         continue;
1185                 tunables->touchboostpulse_endtime = endtime;
1186
1187                 spin_lock_irqsave(&pcpu->target_freq_lock, flags[1]);
1188                 if (pcpu->target_freq < tunables->touchboost_freq) {
1189                         pcpu->target_freq = tunables->touchboost_freq;
1190                         cpumask_set_cpu(i, &speedchange_cpumask);
1191                         pcpu->loc_hispeed_val_time =
1192                                         ktime_to_us(ktime_get());
1193                         anyboost = 1;
1194                 }
1195
1196                 pcpu->floor_freq = tunables->touchboost_freq;
1197                 pcpu->loc_floor_val_time = ktime_to_us(ktime_get());
1198
1199                 spin_unlock_irqrestore(&pcpu->target_freq_lock, flags[1]);
1200         }
1201
1202         spin_unlock_irqrestore(&speedchange_cpumask_lock, flags[0]);
1203
1204         if (anyboost)
1205                 wake_up_process(speedchange_task);
1206 }
1207
1208 static int cpufreq_interactive_input_connect(struct input_handler *handler,
1209                                              struct input_dev *dev,
1210                                              const struct input_device_id *id)
1211 {
1212         struct input_handle *handle;
1213         int error;
1214
1215         handle = kzalloc(sizeof(*handle), GFP_KERNEL);
1216         if (!handle)
1217                 return -ENOMEM;
1218
1219         handle->dev = dev;
1220         handle->handler = handler;
1221         handle->name = "cpufreq";
1222
1223         error = input_register_handle(handle);
1224         if (error)
1225                 goto err2;
1226
1227         error = input_open_device(handle);
1228         if (error)
1229                 goto err1;
1230
1231         return 0;
1232 err1:
1233         input_unregister_handle(handle);
1234 err2:
1235         kfree(handle);
1236         return error;
1237 }
1238
1239 static void cpufreq_interactive_input_disconnect(struct input_handle *handle)
1240 {
1241         input_close_device(handle);
1242         input_unregister_handle(handle);
1243         kfree(handle);
1244 }
1245
1246 static const struct input_device_id cpufreq_interactive_ids[] = {
1247         {
1248                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1249                         INPUT_DEVICE_ID_MATCH_ABSBIT,
1250                 .evbit = { BIT_MASK(EV_ABS) },
1251                 .absbit = { [BIT_WORD(ABS_MT_POSITION_X)] =
1252                         BIT_MASK(ABS_MT_POSITION_X) |
1253                         BIT_MASK(ABS_MT_POSITION_Y) },
1254         },
1255         {
1256                 .flags = INPUT_DEVICE_ID_MATCH_KEYBIT |
1257                         INPUT_DEVICE_ID_MATCH_ABSBIT,
1258                 .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) },
1259                 .absbit = { [BIT_WORD(ABS_X)] =
1260                         BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) },
1261         },
1262         {
1263                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT,
1264                 .evbit = { BIT_MASK(EV_KEY) },
1265         },
1266         { },
1267 };
1268
1269 static struct input_handler cpufreq_interactive_input_handler = {
1270         .event          = cpufreq_interactive_input_event,
1271         .connect        = cpufreq_interactive_input_connect,
1272         .disconnect     = cpufreq_interactive_input_disconnect,
1273         .name           = "cpufreq_interactive",
1274         .id_table       = cpufreq_interactive_ids,
1275 };
1276
1277 static void rockchip_cpufreq_policy_init(struct cpufreq_policy *policy)
1278 {
1279         struct cpufreq_interactive_tunables *tunables = policy->governor_data;
1280
1281         tunables->min_sample_time = 40 * USEC_PER_MSEC;
1282         tunables->boostpulse_duration_val = 40 * USEC_PER_MSEC;
1283         if (policy->cpu == 0) {
1284                 tunables->hispeed_freq = 1008000;
1285                 tunables->touchboostpulse_duration_val = 500 * USEC_PER_MSEC;
1286                 tunables->touchboost_freq = 1200000;
1287         } else {
1288                 tunables->hispeed_freq = 816000;
1289         }
1290 }
1291 #endif
1292
1293 static int cpufreq_governor_interactive(struct cpufreq_policy *policy,
1294                 unsigned int event)
1295 {
1296         int rc;
1297         unsigned int j;
1298         struct cpufreq_interactive_cpuinfo *pcpu;
1299         struct cpufreq_frequency_table *freq_table;
1300         struct cpufreq_interactive_tunables *tunables;
1301         unsigned long flags;
1302
1303         if (have_governor_per_policy())
1304                 tunables = policy->governor_data;
1305         else
1306                 tunables = common_tunables;
1307
1308         WARN_ON(!tunables && (event != CPUFREQ_GOV_POLICY_INIT));
1309
1310         switch (event) {
1311         case CPUFREQ_GOV_POLICY_INIT:
1312                 if (have_governor_per_policy()) {
1313                         WARN_ON(tunables);
1314                 } else if (tunables) {
1315                         tunables->usage_count++;
1316                         policy->governor_data = tunables;
1317                         return 0;
1318                 }
1319
1320                 tunables = kzalloc(sizeof(*tunables), GFP_KERNEL);
1321                 if (!tunables) {
1322                         pr_err("%s: POLICY_INIT: kzalloc failed\n", __func__);
1323                         return -ENOMEM;
1324                 }
1325
1326                 tunables->usage_count = 1;
1327                 tunables->above_hispeed_delay = default_above_hispeed_delay;
1328                 tunables->nabove_hispeed_delay =
1329                         ARRAY_SIZE(default_above_hispeed_delay);
1330                 tunables->go_hispeed_load = DEFAULT_GO_HISPEED_LOAD;
1331                 tunables->target_loads = default_target_loads;
1332                 tunables->ntarget_loads = ARRAY_SIZE(default_target_loads);
1333                 tunables->min_sample_time = DEFAULT_MIN_SAMPLE_TIME;
1334                 tunables->timer_rate = DEFAULT_TIMER_RATE;
1335                 tunables->boostpulse_duration_val = DEFAULT_MIN_SAMPLE_TIME;
1336                 tunables->timer_slack_val = DEFAULT_TIMER_SLACK;
1337
1338                 spin_lock_init(&tunables->target_loads_lock);
1339                 spin_lock_init(&tunables->above_hispeed_delay_lock);
1340
1341                 policy->governor_data = tunables;
1342                 if (!have_governor_per_policy()) {
1343                         common_tunables = tunables;
1344                 }
1345
1346 #ifdef CONFIG_ARCH_ROCKCHIP
1347                 rockchip_cpufreq_policy_init(policy);
1348 #endif
1349
1350                 rc = sysfs_create_group(get_governor_parent_kobj(policy),
1351                                 get_sysfs_attr());
1352                 if (rc) {
1353                         kfree(tunables);
1354                         policy->governor_data = NULL;
1355                         if (!have_governor_per_policy()) {
1356                                 common_tunables = NULL;
1357                         }
1358                         return rc;
1359                 }
1360
1361                 if (!policy->governor->initialized) {
1362                         idle_notifier_register(&cpufreq_interactive_idle_nb);
1363                         cpufreq_register_notifier(&cpufreq_notifier_block,
1364                                         CPUFREQ_TRANSITION_NOTIFIER);
1365 #ifdef CONFIG_ARCH_ROCKCHIP
1366                         rc = input_register_handler(&cpufreq_interactive_input_handler);
1367 #endif
1368
1369                 }
1370
1371                 break;
1372
1373         case CPUFREQ_GOV_POLICY_EXIT:
1374                 if (!--tunables->usage_count) {
1375                         if (policy->governor->initialized == 1) {
1376 #ifdef CONFIG_ARCH_ROCKCHIP
1377                                 input_unregister_handler(&cpufreq_interactive_input_handler);
1378 #endif
1379                                 cpufreq_unregister_notifier(&cpufreq_notifier_block,
1380                                                 CPUFREQ_TRANSITION_NOTIFIER);
1381                                 idle_notifier_unregister(&cpufreq_interactive_idle_nb);
1382                         }
1383
1384                         sysfs_remove_group(get_governor_parent_kobj(policy),
1385                                         get_sysfs_attr());
1386
1387                         kfree(tunables);
1388                         common_tunables = NULL;
1389                 }
1390
1391                 policy->governor_data = NULL;
1392                 break;
1393
1394         case CPUFREQ_GOV_START:
1395                 mutex_lock(&gov_lock);
1396
1397                 freq_table = cpufreq_frequency_get_table(policy->cpu);
1398                 if (!tunables->hispeed_freq)
1399                         tunables->hispeed_freq = policy->max;
1400
1401                 for_each_cpu(j, policy->cpus) {
1402                         pcpu = &per_cpu(cpuinfo, j);
1403                         pcpu->policy = policy;
1404                         pcpu->target_freq = policy->cur;
1405                         pcpu->freq_table = freq_table;
1406                         pcpu->floor_freq = pcpu->target_freq;
1407                         pcpu->pol_floor_val_time =
1408                                 ktime_to_us(ktime_get());
1409                         pcpu->loc_floor_val_time = pcpu->pol_floor_val_time;
1410                         pcpu->pol_hispeed_val_time = pcpu->pol_floor_val_time;
1411                         pcpu->loc_hispeed_val_time = pcpu->pol_floor_val_time;
1412                         down_write(&pcpu->enable_sem);
1413                         del_timer_sync(&pcpu->cpu_timer);
1414                         del_timer_sync(&pcpu->cpu_slack_timer);
1415                         cpufreq_interactive_timer_start(tunables, j);
1416                         pcpu->governor_enabled = 1;
1417                         up_write(&pcpu->enable_sem);
1418                 }
1419
1420                 mutex_unlock(&gov_lock);
1421                 break;
1422
1423         case CPUFREQ_GOV_STOP:
1424                 mutex_lock(&gov_lock);
1425                 for_each_cpu(j, policy->cpus) {
1426                         pcpu = &per_cpu(cpuinfo, j);
1427                         down_write(&pcpu->enable_sem);
1428                         pcpu->governor_enabled = 0;
1429                         del_timer_sync(&pcpu->cpu_timer);
1430                         del_timer_sync(&pcpu->cpu_slack_timer);
1431                         up_write(&pcpu->enable_sem);
1432                 }
1433
1434                 mutex_unlock(&gov_lock);
1435                 break;
1436
1437         case CPUFREQ_GOV_LIMITS:
1438                 if (policy->max < policy->cur)
1439                         __cpufreq_driver_target(policy,
1440                                         policy->max, CPUFREQ_RELATION_H);
1441                 else if (policy->min > policy->cur)
1442                         __cpufreq_driver_target(policy,
1443                                         policy->min, CPUFREQ_RELATION_L);
1444                 for_each_cpu(j, policy->cpus) {
1445                         pcpu = &per_cpu(cpuinfo, j);
1446
1447                         down_read(&pcpu->enable_sem);
1448                         if (pcpu->governor_enabled == 0) {
1449                                 up_read(&pcpu->enable_sem);
1450                                 continue;
1451                         }
1452
1453                         spin_lock_irqsave(&pcpu->target_freq_lock, flags);
1454                         if (policy->max < pcpu->target_freq)
1455                                 pcpu->target_freq = policy->max;
1456                         else if (policy->min > pcpu->target_freq)
1457                                 pcpu->target_freq = policy->min;
1458
1459                         spin_unlock_irqrestore(&pcpu->target_freq_lock, flags);
1460                         up_read(&pcpu->enable_sem);
1461                 }
1462                 break;
1463         }
1464         return 0;
1465 }
1466
1467 #ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_INTERACTIVE
1468 static
1469 #endif
1470 struct cpufreq_governor cpufreq_gov_interactive = {
1471         .name = "interactive",
1472         .governor = cpufreq_governor_interactive,
1473         .max_transition_latency = 10000000,
1474         .owner = THIS_MODULE,
1475 };
1476
1477 static void cpufreq_interactive_nop_timer(unsigned long data)
1478 {
1479 }
1480
1481 static int __init cpufreq_interactive_init(void)
1482 {
1483         unsigned int i;
1484         struct cpufreq_interactive_cpuinfo *pcpu;
1485         struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
1486
1487         /* Initalize per-cpu timers */
1488         for_each_possible_cpu(i) {
1489                 pcpu = &per_cpu(cpuinfo, i);
1490                 init_timer_deferrable(&pcpu->cpu_timer);
1491                 pcpu->cpu_timer.function = cpufreq_interactive_timer;
1492                 pcpu->cpu_timer.data = i;
1493                 init_timer(&pcpu->cpu_slack_timer);
1494                 pcpu->cpu_slack_timer.function = cpufreq_interactive_nop_timer;
1495                 spin_lock_init(&pcpu->load_lock);
1496                 spin_lock_init(&pcpu->target_freq_lock);
1497                 init_rwsem(&pcpu->enable_sem);
1498         }
1499
1500         spin_lock_init(&speedchange_cpumask_lock);
1501         mutex_init(&gov_lock);
1502         speedchange_task =
1503                 kthread_create(cpufreq_interactive_speedchange_task, NULL,
1504                                "cfinteractive");
1505         if (IS_ERR(speedchange_task))
1506                 return PTR_ERR(speedchange_task);
1507
1508         sched_setscheduler_nocheck(speedchange_task, SCHED_FIFO, &param);
1509         get_task_struct(speedchange_task);
1510
1511         /* NB: wake up so the thread does not look hung to the freezer */
1512         wake_up_process(speedchange_task);
1513
1514         return cpufreq_register_governor(&cpufreq_gov_interactive);
1515 }
1516
1517 #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_INTERACTIVE
1518 fs_initcall(cpufreq_interactive_init);
1519 #else
1520 module_init(cpufreq_interactive_init);
1521 #endif
1522
1523 static void __exit cpufreq_interactive_exit(void)
1524 {
1525         cpufreq_unregister_governor(&cpufreq_gov_interactive);
1526         kthread_stop(speedchange_task);
1527         put_task_struct(speedchange_task);
1528 }
1529
1530 module_exit(cpufreq_interactive_exit);
1531
1532 MODULE_AUTHOR("Mike Chan <mike@android.com>");
1533 MODULE_DESCRIPTION("'cpufreq_interactive' - A cpufreq governor for "
1534         "Latency sensitive workloads");
1535 MODULE_LICENSE("GPL");