Mike Chan | ef96969 | 2010-06-22 11:26:45 -0700 | [diff] [blame] | 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 | #include <linux/module.h> |
| 23 | #include <linux/mutex.h> |
| 24 | #include <linux/sched.h> |
| 25 | #include <linux/sched/rt.h> |
| 26 | #include <linux/tick.h> |
| 27 | #include <linux/time.h> |
| 28 | #include <linux/timer.h> |
| 29 | #include <linux/workqueue.h> |
| 30 | #include <linux/kthread.h> |
| 31 | #include <linux/mutex.h> |
Todd Poynor | ab8dc40 | 2012-04-02 17:17:14 -0700 | [diff] [blame] | 32 | #include <linux/slab.h> |
| 33 | #include <linux/input.h> |
Todd Poynor | 15a9ea0 | 2012-04-23 20:42:41 -0700 | [diff] [blame] | 34 | #include <asm/cputime.h> |
Mike Chan | ef96969 | 2010-06-22 11:26:45 -0700 | [diff] [blame] | 35 | |
Todd Poynor | ae01047 | 2012-02-16 16:27:59 -0800 | [diff] [blame] | 36 | #define CREATE_TRACE_POINTS |
| 37 | #include <trace/events/cpufreq_interactive.h> |
| 38 | |
Mike Chan | ef96969 | 2010-06-22 11:26:45 -0700 | [diff] [blame] | 39 | static atomic_t active_count = ATOMIC_INIT(0); |
| 40 | |
| 41 | struct cpufreq_interactive_cpuinfo { |
| 42 | struct timer_list cpu_timer; |
| 43 | int timer_idlecancel; |
| 44 | u64 time_in_idle; |
| 45 | u64 idle_exit_time; |
| 46 | u64 timer_run_time; |
| 47 | int idling; |
Todd Poynor | 1f408dc | 2012-04-06 19:59:36 -0700 | [diff] [blame] | 48 | u64 target_set_time; |
| 49 | u64 target_set_time_in_idle; |
Mike Chan | ef96969 | 2010-06-22 11:26:45 -0700 | [diff] [blame] | 50 | struct cpufreq_policy *policy; |
| 51 | struct cpufreq_frequency_table *freq_table; |
| 52 | unsigned int target_freq; |
Todd Poynor | 6d15fa3 | 2012-04-26 21:41:40 -0700 | [diff] [blame] | 53 | unsigned int floor_freq; |
| 54 | u64 floor_validate_time; |
Todd Poynor | 1a0389a | 2012-05-10 23:28:06 -0700 | [diff] [blame] | 55 | u64 hispeed_validate_time; |
Mike Chan | ef96969 | 2010-06-22 11:26:45 -0700 | [diff] [blame] | 56 | int governor_enabled; |
| 57 | }; |
| 58 | |
| 59 | static DEFINE_PER_CPU(struct cpufreq_interactive_cpuinfo, cpuinfo); |
| 60 | |
| 61 | /* Workqueues handle frequency scaling */ |
| 62 | static struct task_struct *up_task; |
| 63 | static struct workqueue_struct *down_wq; |
| 64 | static struct work_struct freq_scale_down_work; |
| 65 | static cpumask_t up_cpumask; |
| 66 | static spinlock_t up_cpumask_lock; |
| 67 | static cpumask_t down_cpumask; |
| 68 | static spinlock_t down_cpumask_lock; |
| 69 | static struct mutex set_speed_lock; |
| 70 | |
| 71 | /* Hi speed to bump to from lo speed when load burst (default max) */ |
| 72 | static u64 hispeed_freq; |
| 73 | |
| 74 | /* Go to hi speed when CPU load at or above this value. */ |
Todd Poynor | a380aa8 | 2012-04-17 17:39:34 -0700 | [diff] [blame] | 75 | #define DEFAULT_GO_HISPEED_LOAD 85 |
Mike Chan | ef96969 | 2010-06-22 11:26:45 -0700 | [diff] [blame] | 76 | static unsigned long go_hispeed_load; |
| 77 | |
| 78 | /* |
| 79 | * The minimum amount of time to spend at a frequency before we can ramp down. |
| 80 | */ |
Todd Poynor | a380aa8 | 2012-04-17 17:39:34 -0700 | [diff] [blame] | 81 | #define DEFAULT_MIN_SAMPLE_TIME (80 * USEC_PER_MSEC) |
Mike Chan | ef96969 | 2010-06-22 11:26:45 -0700 | [diff] [blame] | 82 | static unsigned long min_sample_time; |
| 83 | |
| 84 | /* |
| 85 | * The sample rate of the timer used to increase frequency |
| 86 | */ |
Todd Poynor | a380aa8 | 2012-04-17 17:39:34 -0700 | [diff] [blame] | 87 | #define DEFAULT_TIMER_RATE (20 * USEC_PER_MSEC) |
Mike Chan | ef96969 | 2010-06-22 11:26:45 -0700 | [diff] [blame] | 88 | static unsigned long timer_rate; |
| 89 | |
Todd Poynor | cbbe17d | 2012-04-13 20:18:02 -0700 | [diff] [blame] | 90 | /* |
| 91 | * Wait this long before raising speed above hispeed, by default a single |
| 92 | * timer interval. |
| 93 | */ |
| 94 | #define DEFAULT_ABOVE_HISPEED_DELAY DEFAULT_TIMER_RATE |
| 95 | static unsigned long above_hispeed_delay_val; |
| 96 | |
Todd Poynor | ab8dc40 | 2012-04-02 17:17:14 -0700 | [diff] [blame] | 97 | /* |
Todd Poynor | 15a9ea0 | 2012-04-23 20:42:41 -0700 | [diff] [blame] | 98 | * Boost pulse to hispeed on touchscreen input. |
Todd Poynor | ab8dc40 | 2012-04-02 17:17:14 -0700 | [diff] [blame] | 99 | */ |
| 100 | |
| 101 | static int input_boost_val; |
| 102 | |
| 103 | struct cpufreq_interactive_inputopen { |
| 104 | struct input_handle *handle; |
| 105 | struct work_struct inputopen_work; |
| 106 | }; |
| 107 | |
| 108 | static struct cpufreq_interactive_inputopen inputopen; |
| 109 | |
Todd Poynor | 15a9ea0 | 2012-04-23 20:42:41 -0700 | [diff] [blame] | 110 | /* |
| 111 | * Non-zero means longer-term speed boost active. |
| 112 | */ |
| 113 | |
| 114 | static int boost_val; |
| 115 | |
Mike Chan | ef96969 | 2010-06-22 11:26:45 -0700 | [diff] [blame] | 116 | static int cpufreq_governor_interactive(struct cpufreq_policy *policy, |
| 117 | unsigned int event); |
| 118 | |
| 119 | #ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_INTERACTIVE |
| 120 | static |
| 121 | #endif |
| 122 | struct cpufreq_governor cpufreq_gov_interactive = { |
| 123 | .name = "interactive", |
| 124 | .governor = cpufreq_governor_interactive, |
| 125 | .max_transition_latency = 10000000, |
| 126 | .owner = THIS_MODULE, |
| 127 | }; |
| 128 | |
| 129 | static void cpufreq_interactive_timer(unsigned long data) |
| 130 | { |
| 131 | unsigned int delta_idle; |
| 132 | unsigned int delta_time; |
| 133 | int cpu_load; |
| 134 | int load_since_change; |
| 135 | u64 time_in_idle; |
| 136 | u64 idle_exit_time; |
| 137 | struct cpufreq_interactive_cpuinfo *pcpu = |
| 138 | &per_cpu(cpuinfo, data); |
| 139 | u64 now_idle; |
| 140 | unsigned int new_freq; |
| 141 | unsigned int index; |
| 142 | unsigned long flags; |
| 143 | |
| 144 | smp_rmb(); |
| 145 | |
| 146 | if (!pcpu->governor_enabled) |
| 147 | goto exit; |
| 148 | |
| 149 | /* |
| 150 | * Once pcpu->timer_run_time is updated to >= pcpu->idle_exit_time, |
| 151 | * this lets idle exit know the current idle time sample has |
| 152 | * been processed, and idle exit can generate a new sample and |
| 153 | * re-arm the timer. This prevents a concurrent idle |
| 154 | * exit on that CPU from writing a new set of info at the same time |
| 155 | * the timer function runs (the timer function can't use that info |
| 156 | * until more time passes). |
| 157 | */ |
| 158 | time_in_idle = pcpu->time_in_idle; |
| 159 | idle_exit_time = pcpu->idle_exit_time; |
| 160 | now_idle = get_cpu_idle_time_us(data, &pcpu->timer_run_time); |
| 161 | smp_wmb(); |
| 162 | |
| 163 | /* If we raced with cancelling a timer, skip. */ |
| 164 | if (!idle_exit_time) |
| 165 | goto exit; |
| 166 | |
| 167 | delta_idle = (unsigned int)(now_idle - time_in_idle); |
| 168 | delta_time = (unsigned int)(pcpu->timer_run_time - idle_exit_time); |
| 169 | |
| 170 | /* |
| 171 | * If timer ran less than 1ms after short-term sample started, retry. |
| 172 | */ |
| 173 | if (delta_time < 1000) |
| 174 | goto rearm; |
| 175 | |
| 176 | if (delta_idle > delta_time) |
| 177 | cpu_load = 0; |
| 178 | else |
| 179 | cpu_load = 100 * (delta_time - delta_idle) / delta_time; |
| 180 | |
Todd Poynor | 1f408dc | 2012-04-06 19:59:36 -0700 | [diff] [blame] | 181 | delta_idle = (unsigned int)(now_idle - pcpu->target_set_time_in_idle); |
| 182 | delta_time = (unsigned int)(pcpu->timer_run_time - |
| 183 | pcpu->target_set_time); |
Mike Chan | ef96969 | 2010-06-22 11:26:45 -0700 | [diff] [blame] | 184 | |
| 185 | if ((delta_time == 0) || (delta_idle > delta_time)) |
| 186 | load_since_change = 0; |
| 187 | else |
| 188 | load_since_change = |
| 189 | 100 * (delta_time - delta_idle) / delta_time; |
| 190 | |
| 191 | /* |
| 192 | * Choose greater of short-term load (since last idle timer |
| 193 | * started or timer function re-armed itself) or long-term load |
| 194 | * (since last frequency change). |
| 195 | */ |
| 196 | if (load_since_change > cpu_load) |
| 197 | cpu_load = load_since_change; |
| 198 | |
Todd Poynor | 15a9ea0 | 2012-04-23 20:42:41 -0700 | [diff] [blame] | 199 | if (cpu_load >= go_hispeed_load || boost_val) { |
Todd Poynor | d932f22 | 2012-04-19 12:52:48 -0700 | [diff] [blame] | 200 | if (pcpu->target_freq <= pcpu->policy->min) { |
Mike Chan | ef96969 | 2010-06-22 11:26:45 -0700 | [diff] [blame] | 201 | new_freq = hispeed_freq; |
Todd Poynor | f87b9d5 | 2012-04-06 19:50:12 -0700 | [diff] [blame] | 202 | } else { |
Mike Chan | ef96969 | 2010-06-22 11:26:45 -0700 | [diff] [blame] | 203 | new_freq = pcpu->policy->max * cpu_load / 100; |
Todd Poynor | f87b9d5 | 2012-04-06 19:50:12 -0700 | [diff] [blame] | 204 | |
| 205 | if (new_freq < hispeed_freq) |
| 206 | new_freq = hispeed_freq; |
Todd Poynor | cbbe17d | 2012-04-13 20:18:02 -0700 | [diff] [blame] | 207 | |
| 208 | if (pcpu->target_freq == hispeed_freq && |
| 209 | new_freq > hispeed_freq && |
Todd Poynor | 1a0389a | 2012-05-10 23:28:06 -0700 | [diff] [blame] | 210 | pcpu->timer_run_time - pcpu->hispeed_validate_time |
Todd Poynor | cbbe17d | 2012-04-13 20:18:02 -0700 | [diff] [blame] | 211 | < above_hispeed_delay_val) { |
| 212 | trace_cpufreq_interactive_notyet(data, cpu_load, |
| 213 | pcpu->target_freq, |
| 214 | new_freq); |
| 215 | goto rearm; |
| 216 | } |
Todd Poynor | f87b9d5 | 2012-04-06 19:50:12 -0700 | [diff] [blame] | 217 | } |
Mike Chan | ef96969 | 2010-06-22 11:26:45 -0700 | [diff] [blame] | 218 | } else { |
Todd Poynor | c1128fc | 2012-04-06 01:13:09 -0700 | [diff] [blame] | 219 | new_freq = pcpu->policy->max * cpu_load / 100; |
Mike Chan | ef96969 | 2010-06-22 11:26:45 -0700 | [diff] [blame] | 220 | } |
| 221 | |
Todd Poynor | 1a0389a | 2012-05-10 23:28:06 -0700 | [diff] [blame] | 222 | if (new_freq <= hispeed_freq) |
| 223 | pcpu->hispeed_validate_time = pcpu->timer_run_time; |
| 224 | |
Mike Chan | ef96969 | 2010-06-22 11:26:45 -0700 | [diff] [blame] | 225 | if (cpufreq_frequency_table_target(pcpu->policy, pcpu->freq_table, |
| 226 | new_freq, CPUFREQ_RELATION_H, |
| 227 | &index)) { |
| 228 | pr_warn_once("timer %d: cpufreq_frequency_table_target error\n", |
| 229 | (int) data); |
| 230 | goto rearm; |
| 231 | } |
| 232 | |
| 233 | new_freq = pcpu->freq_table[index].frequency; |
| 234 | |
Mike Chan | ef96969 | 2010-06-22 11:26:45 -0700 | [diff] [blame] | 235 | /* |
Todd Poynor | 6d15fa3 | 2012-04-26 21:41:40 -0700 | [diff] [blame] | 236 | * Do not scale below floor_freq unless we have been at or above the |
| 237 | * floor frequency for the minimum sample time since last validated. |
Mike Chan | ef96969 | 2010-06-22 11:26:45 -0700 | [diff] [blame] | 238 | */ |
Todd Poynor | 6d15fa3 | 2012-04-26 21:41:40 -0700 | [diff] [blame] | 239 | if (new_freq < pcpu->floor_freq) { |
John Stultz | 0b950bb | 2012-05-01 14:10:31 -0700 | [diff] [blame] | 240 | if (pcpu->timer_run_time - pcpu->floor_validate_time |
Todd Poynor | ae01047 | 2012-02-16 16:27:59 -0800 | [diff] [blame] | 241 | < min_sample_time) { |
| 242 | trace_cpufreq_interactive_notyet(data, cpu_load, |
| 243 | pcpu->target_freq, new_freq); |
Mike Chan | ef96969 | 2010-06-22 11:26:45 -0700 | [diff] [blame] | 244 | goto rearm; |
Todd Poynor | ae01047 | 2012-02-16 16:27:59 -0800 | [diff] [blame] | 245 | } |
Mike Chan | ef96969 | 2010-06-22 11:26:45 -0700 | [diff] [blame] | 246 | } |
| 247 | |
Todd Poynor | 6d15fa3 | 2012-04-26 21:41:40 -0700 | [diff] [blame] | 248 | pcpu->floor_freq = new_freq; |
| 249 | pcpu->floor_validate_time = pcpu->timer_run_time; |
Todd Poynor | 1f408dc | 2012-04-06 19:59:36 -0700 | [diff] [blame] | 250 | |
| 251 | if (pcpu->target_freq == new_freq) { |
| 252 | trace_cpufreq_interactive_already(data, cpu_load, |
| 253 | pcpu->target_freq, new_freq); |
| 254 | goto rearm_if_notmax; |
| 255 | } |
| 256 | |
Todd Poynor | ae01047 | 2012-02-16 16:27:59 -0800 | [diff] [blame] | 257 | trace_cpufreq_interactive_target(data, cpu_load, pcpu->target_freq, |
| 258 | new_freq); |
Todd Poynor | 8a833f1 | 2012-04-20 13:18:32 -0700 | [diff] [blame] | 259 | pcpu->target_set_time_in_idle = now_idle; |
| 260 | pcpu->target_set_time = pcpu->timer_run_time; |
Todd Poynor | ae01047 | 2012-02-16 16:27:59 -0800 | [diff] [blame] | 261 | |
Mike Chan | ef96969 | 2010-06-22 11:26:45 -0700 | [diff] [blame] | 262 | if (new_freq < pcpu->target_freq) { |
| 263 | pcpu->target_freq = new_freq; |
| 264 | spin_lock_irqsave(&down_cpumask_lock, flags); |
| 265 | cpumask_set_cpu(data, &down_cpumask); |
| 266 | spin_unlock_irqrestore(&down_cpumask_lock, flags); |
| 267 | queue_work(down_wq, &freq_scale_down_work); |
| 268 | } else { |
| 269 | pcpu->target_freq = new_freq; |
| 270 | spin_lock_irqsave(&up_cpumask_lock, flags); |
| 271 | cpumask_set_cpu(data, &up_cpumask); |
| 272 | spin_unlock_irqrestore(&up_cpumask_lock, flags); |
| 273 | wake_up_process(up_task); |
| 274 | } |
| 275 | |
| 276 | rearm_if_notmax: |
| 277 | /* |
| 278 | * Already set max speed and don't see a need to change that, |
| 279 | * wait until next idle to re-evaluate, don't need timer. |
| 280 | */ |
| 281 | if (pcpu->target_freq == pcpu->policy->max) |
| 282 | goto exit; |
| 283 | |
| 284 | rearm: |
| 285 | if (!timer_pending(&pcpu->cpu_timer)) { |
| 286 | /* |
| 287 | * If already at min: if that CPU is idle, don't set timer. |
| 288 | * Else cancel the timer if that CPU goes idle. We don't |
| 289 | * need to re-evaluate speed until the next idle exit. |
| 290 | */ |
| 291 | if (pcpu->target_freq == pcpu->policy->min) { |
| 292 | smp_rmb(); |
| 293 | |
| 294 | if (pcpu->idling) |
| 295 | goto exit; |
| 296 | |
| 297 | pcpu->timer_idlecancel = 1; |
| 298 | } |
| 299 | |
| 300 | pcpu->time_in_idle = get_cpu_idle_time_us( |
| 301 | data, &pcpu->idle_exit_time); |
| 302 | mod_timer(&pcpu->cpu_timer, |
| 303 | jiffies + usecs_to_jiffies(timer_rate)); |
| 304 | } |
| 305 | |
| 306 | exit: |
| 307 | return; |
| 308 | } |
| 309 | |
| 310 | static void cpufreq_interactive_idle_start(void) |
| 311 | { |
| 312 | struct cpufreq_interactive_cpuinfo *pcpu = |
| 313 | &per_cpu(cpuinfo, smp_processor_id()); |
| 314 | int pending; |
| 315 | |
| 316 | if (!pcpu->governor_enabled) |
| 317 | return; |
| 318 | |
| 319 | pcpu->idling = 1; |
| 320 | smp_wmb(); |
| 321 | pending = timer_pending(&pcpu->cpu_timer); |
| 322 | |
| 323 | if (pcpu->target_freq != pcpu->policy->min) { |
| 324 | #ifdef CONFIG_SMP |
| 325 | /* |
| 326 | * Entering idle while not at lowest speed. On some |
| 327 | * platforms this can hold the other CPU(s) at that speed |
| 328 | * even though the CPU is idle. Set a timer to re-evaluate |
| 329 | * speed so this idle CPU doesn't hold the other CPUs above |
| 330 | * min indefinitely. This should probably be a quirk of |
| 331 | * the CPUFreq driver. |
| 332 | */ |
| 333 | if (!pending) { |
| 334 | pcpu->time_in_idle = get_cpu_idle_time_us( |
| 335 | smp_processor_id(), &pcpu->idle_exit_time); |
| 336 | pcpu->timer_idlecancel = 0; |
| 337 | mod_timer(&pcpu->cpu_timer, |
| 338 | jiffies + usecs_to_jiffies(timer_rate)); |
| 339 | } |
| 340 | #endif |
| 341 | } else { |
| 342 | /* |
| 343 | * If at min speed and entering idle after load has |
| 344 | * already been evaluated, and a timer has been set just in |
| 345 | * case the CPU suddenly goes busy, cancel that timer. The |
| 346 | * CPU didn't go busy; we'll recheck things upon idle exit. |
| 347 | */ |
| 348 | if (pending && pcpu->timer_idlecancel) { |
| 349 | del_timer(&pcpu->cpu_timer); |
| 350 | /* |
| 351 | * Ensure last timer run time is after current idle |
| 352 | * sample start time, so next idle exit will always |
| 353 | * start a new idle sampling period. |
| 354 | */ |
| 355 | pcpu->idle_exit_time = 0; |
| 356 | pcpu->timer_idlecancel = 0; |
| 357 | } |
| 358 | } |
| 359 | |
| 360 | } |
| 361 | |
| 362 | static void cpufreq_interactive_idle_end(void) |
| 363 | { |
| 364 | struct cpufreq_interactive_cpuinfo *pcpu = |
| 365 | &per_cpu(cpuinfo, smp_processor_id()); |
| 366 | |
Sam Leffler | 3ab7c2b | 2012-06-27 10:12:04 -0700 | [diff] [blame] | 367 | if (!pcpu->governor_enabled) |
| 368 | return; |
| 369 | |
Mike Chan | ef96969 | 2010-06-22 11:26:45 -0700 | [diff] [blame] | 370 | pcpu->idling = 0; |
| 371 | smp_wmb(); |
| 372 | |
| 373 | /* |
| 374 | * Arm the timer for 1-2 ticks later if not already, and if the timer |
| 375 | * function has already processed the previous load sampling |
| 376 | * interval. (If the timer is not pending but has not processed |
| 377 | * the previous interval, it is probably racing with us on another |
| 378 | * CPU. Let it compute load based on the previous sample and then |
| 379 | * re-arm the timer for another interval when it's done, rather |
| 380 | * than updating the interval start time to be "now", which doesn't |
| 381 | * give the timer function enough time to make a decision on this |
| 382 | * run.) |
| 383 | */ |
| 384 | if (timer_pending(&pcpu->cpu_timer) == 0 && |
| 385 | pcpu->timer_run_time >= pcpu->idle_exit_time && |
| 386 | pcpu->governor_enabled) { |
| 387 | pcpu->time_in_idle = |
| 388 | get_cpu_idle_time_us(smp_processor_id(), |
| 389 | &pcpu->idle_exit_time); |
| 390 | pcpu->timer_idlecancel = 0; |
| 391 | mod_timer(&pcpu->cpu_timer, |
| 392 | jiffies + usecs_to_jiffies(timer_rate)); |
| 393 | } |
| 394 | |
| 395 | } |
| 396 | |
| 397 | static int cpufreq_interactive_up_task(void *data) |
| 398 | { |
| 399 | unsigned int cpu; |
| 400 | cpumask_t tmp_mask; |
| 401 | unsigned long flags; |
| 402 | struct cpufreq_interactive_cpuinfo *pcpu; |
| 403 | |
| 404 | while (1) { |
| 405 | set_current_state(TASK_INTERRUPTIBLE); |
| 406 | spin_lock_irqsave(&up_cpumask_lock, flags); |
| 407 | |
| 408 | if (cpumask_empty(&up_cpumask)) { |
| 409 | spin_unlock_irqrestore(&up_cpumask_lock, flags); |
| 410 | schedule(); |
| 411 | |
| 412 | if (kthread_should_stop()) |
| 413 | break; |
| 414 | |
| 415 | spin_lock_irqsave(&up_cpumask_lock, flags); |
| 416 | } |
| 417 | |
| 418 | set_current_state(TASK_RUNNING); |
| 419 | tmp_mask = up_cpumask; |
| 420 | cpumask_clear(&up_cpumask); |
| 421 | spin_unlock_irqrestore(&up_cpumask_lock, flags); |
| 422 | |
| 423 | for_each_cpu(cpu, &tmp_mask) { |
| 424 | unsigned int j; |
| 425 | unsigned int max_freq = 0; |
| 426 | |
| 427 | pcpu = &per_cpu(cpuinfo, cpu); |
| 428 | smp_rmb(); |
| 429 | |
| 430 | if (!pcpu->governor_enabled) |
| 431 | continue; |
| 432 | |
| 433 | mutex_lock(&set_speed_lock); |
| 434 | |
| 435 | for_each_cpu(j, pcpu->policy->cpus) { |
| 436 | struct cpufreq_interactive_cpuinfo *pjcpu = |
| 437 | &per_cpu(cpuinfo, j); |
| 438 | |
| 439 | if (pjcpu->target_freq > max_freq) |
| 440 | max_freq = pjcpu->target_freq; |
| 441 | } |
| 442 | |
| 443 | if (max_freq != pcpu->policy->cur) |
| 444 | __cpufreq_driver_target(pcpu->policy, |
| 445 | max_freq, |
| 446 | CPUFREQ_RELATION_H); |
| 447 | mutex_unlock(&set_speed_lock); |
Todd Poynor | ae01047 | 2012-02-16 16:27:59 -0800 | [diff] [blame] | 448 | trace_cpufreq_interactive_up(cpu, pcpu->target_freq, |
| 449 | pcpu->policy->cur); |
Mike Chan | ef96969 | 2010-06-22 11:26:45 -0700 | [diff] [blame] | 450 | } |
| 451 | } |
| 452 | |
| 453 | return 0; |
| 454 | } |
| 455 | |
| 456 | static void cpufreq_interactive_freq_down(struct work_struct *work) |
| 457 | { |
| 458 | unsigned int cpu; |
| 459 | cpumask_t tmp_mask; |
| 460 | unsigned long flags; |
| 461 | struct cpufreq_interactive_cpuinfo *pcpu; |
| 462 | |
| 463 | spin_lock_irqsave(&down_cpumask_lock, flags); |
| 464 | tmp_mask = down_cpumask; |
| 465 | cpumask_clear(&down_cpumask); |
| 466 | spin_unlock_irqrestore(&down_cpumask_lock, flags); |
| 467 | |
| 468 | for_each_cpu(cpu, &tmp_mask) { |
| 469 | unsigned int j; |
| 470 | unsigned int max_freq = 0; |
| 471 | |
| 472 | pcpu = &per_cpu(cpuinfo, cpu); |
| 473 | smp_rmb(); |
| 474 | |
| 475 | if (!pcpu->governor_enabled) |
| 476 | continue; |
| 477 | |
| 478 | mutex_lock(&set_speed_lock); |
| 479 | |
| 480 | for_each_cpu(j, pcpu->policy->cpus) { |
| 481 | struct cpufreq_interactive_cpuinfo *pjcpu = |
| 482 | &per_cpu(cpuinfo, j); |
| 483 | |
| 484 | if (pjcpu->target_freq > max_freq) |
| 485 | max_freq = pjcpu->target_freq; |
| 486 | } |
| 487 | |
| 488 | if (max_freq != pcpu->policy->cur) |
| 489 | __cpufreq_driver_target(pcpu->policy, max_freq, |
| 490 | CPUFREQ_RELATION_H); |
| 491 | |
| 492 | mutex_unlock(&set_speed_lock); |
Todd Poynor | ae01047 | 2012-02-16 16:27:59 -0800 | [diff] [blame] | 493 | trace_cpufreq_interactive_down(cpu, pcpu->target_freq, |
| 494 | pcpu->policy->cur); |
Mike Chan | ef96969 | 2010-06-22 11:26:45 -0700 | [diff] [blame] | 495 | } |
| 496 | } |
| 497 | |
Todd Poynor | ab8dc40 | 2012-04-02 17:17:14 -0700 | [diff] [blame] | 498 | static void cpufreq_interactive_boost(void) |
| 499 | { |
| 500 | int i; |
| 501 | int anyboost = 0; |
| 502 | unsigned long flags; |
| 503 | struct cpufreq_interactive_cpuinfo *pcpu; |
| 504 | |
Todd Poynor | ab8dc40 | 2012-04-02 17:17:14 -0700 | [diff] [blame] | 505 | spin_lock_irqsave(&up_cpumask_lock, flags); |
| 506 | |
| 507 | for_each_online_cpu(i) { |
| 508 | pcpu = &per_cpu(cpuinfo, i); |
| 509 | |
| 510 | if (pcpu->target_freq < hispeed_freq) { |
| 511 | pcpu->target_freq = hispeed_freq; |
| 512 | cpumask_set_cpu(i, &up_cpumask); |
| 513 | pcpu->target_set_time_in_idle = |
| 514 | get_cpu_idle_time_us(i, &pcpu->target_set_time); |
Todd Poynor | 1a0389a | 2012-05-10 23:28:06 -0700 | [diff] [blame] | 515 | pcpu->hispeed_validate_time = pcpu->target_set_time; |
Todd Poynor | ab8dc40 | 2012-04-02 17:17:14 -0700 | [diff] [blame] | 516 | anyboost = 1; |
| 517 | } |
| 518 | |
| 519 | /* |
Todd Poynor | 6d15fa3 | 2012-04-26 21:41:40 -0700 | [diff] [blame] | 520 | * Set floor freq and (re)start timer for when last |
| 521 | * validated. |
Todd Poynor | ab8dc40 | 2012-04-02 17:17:14 -0700 | [diff] [blame] | 522 | */ |
| 523 | |
Todd Poynor | 6d15fa3 | 2012-04-26 21:41:40 -0700 | [diff] [blame] | 524 | pcpu->floor_freq = hispeed_freq; |
| 525 | pcpu->floor_validate_time = ktime_to_us(ktime_get()); |
Todd Poynor | ab8dc40 | 2012-04-02 17:17:14 -0700 | [diff] [blame] | 526 | } |
| 527 | |
| 528 | spin_unlock_irqrestore(&up_cpumask_lock, flags); |
| 529 | |
| 530 | if (anyboost) |
| 531 | wake_up_process(up_task); |
| 532 | } |
| 533 | |
Todd Poynor | 15a9ea0 | 2012-04-23 20:42:41 -0700 | [diff] [blame] | 534 | /* |
| 535 | * Pulsed boost on input event raises CPUs to hispeed_freq and lets |
| 536 | * usual algorithm of min_sample_time decide when to allow speed |
| 537 | * to drop. |
| 538 | */ |
| 539 | |
Todd Poynor | ab8dc40 | 2012-04-02 17:17:14 -0700 | [diff] [blame] | 540 | static void cpufreq_interactive_input_event(struct input_handle *handle, |
| 541 | unsigned int type, |
| 542 | unsigned int code, int value) |
| 543 | { |
Todd Poynor | 442a312 | 2012-05-03 00:16:55 -0700 | [diff] [blame] | 544 | if (input_boost_val && type == EV_SYN && code == SYN_REPORT) { |
| 545 | trace_cpufreq_interactive_boost("input"); |
Todd Poynor | ab8dc40 | 2012-04-02 17:17:14 -0700 | [diff] [blame] | 546 | cpufreq_interactive_boost(); |
Todd Poynor | 442a312 | 2012-05-03 00:16:55 -0700 | [diff] [blame] | 547 | } |
Todd Poynor | ab8dc40 | 2012-04-02 17:17:14 -0700 | [diff] [blame] | 548 | } |
| 549 | |
| 550 | static void cpufreq_interactive_input_open(struct work_struct *w) |
| 551 | { |
| 552 | struct cpufreq_interactive_inputopen *io = |
| 553 | container_of(w, struct cpufreq_interactive_inputopen, |
| 554 | inputopen_work); |
| 555 | int error; |
| 556 | |
| 557 | error = input_open_device(io->handle); |
| 558 | if (error) |
| 559 | input_unregister_handle(io->handle); |
| 560 | } |
| 561 | |
| 562 | static int cpufreq_interactive_input_connect(struct input_handler *handler, |
| 563 | struct input_dev *dev, |
| 564 | const struct input_device_id *id) |
| 565 | { |
| 566 | struct input_handle *handle; |
| 567 | int error; |
| 568 | |
| 569 | pr_info("%s: connect to %s\n", __func__, dev->name); |
| 570 | handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL); |
| 571 | if (!handle) |
| 572 | return -ENOMEM; |
| 573 | |
| 574 | handle->dev = dev; |
| 575 | handle->handler = handler; |
| 576 | handle->name = "cpufreq_interactive"; |
| 577 | |
| 578 | error = input_register_handle(handle); |
| 579 | if (error) |
| 580 | goto err; |
| 581 | |
| 582 | inputopen.handle = handle; |
| 583 | queue_work(down_wq, &inputopen.inputopen_work); |
| 584 | return 0; |
| 585 | err: |
| 586 | kfree(handle); |
| 587 | return error; |
| 588 | } |
| 589 | |
| 590 | static void cpufreq_interactive_input_disconnect(struct input_handle *handle) |
| 591 | { |
| 592 | input_close_device(handle); |
| 593 | input_unregister_handle(handle); |
| 594 | kfree(handle); |
| 595 | } |
| 596 | |
| 597 | static const struct input_device_id cpufreq_interactive_ids[] = { |
| 598 | { |
| 599 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT | |
| 600 | INPUT_DEVICE_ID_MATCH_ABSBIT, |
| 601 | .evbit = { BIT_MASK(EV_ABS) }, |
| 602 | .absbit = { [BIT_WORD(ABS_MT_POSITION_X)] = |
| 603 | BIT_MASK(ABS_MT_POSITION_X) | |
| 604 | BIT_MASK(ABS_MT_POSITION_Y) }, |
| 605 | }, /* multi-touch touchscreen */ |
| 606 | { |
| 607 | .flags = INPUT_DEVICE_ID_MATCH_KEYBIT | |
| 608 | INPUT_DEVICE_ID_MATCH_ABSBIT, |
| 609 | .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) }, |
| 610 | .absbit = { [BIT_WORD(ABS_X)] = |
| 611 | BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) }, |
| 612 | }, /* touchpad */ |
| 613 | { }, |
| 614 | }; |
| 615 | |
| 616 | static struct input_handler cpufreq_interactive_input_handler = { |
| 617 | .event = cpufreq_interactive_input_event, |
| 618 | .connect = cpufreq_interactive_input_connect, |
| 619 | .disconnect = cpufreq_interactive_input_disconnect, |
| 620 | .name = "cpufreq_interactive", |
| 621 | .id_table = cpufreq_interactive_ids, |
| 622 | }; |
| 623 | |
Mike Chan | ef96969 | 2010-06-22 11:26:45 -0700 | [diff] [blame] | 624 | static ssize_t show_hispeed_freq(struct kobject *kobj, |
| 625 | struct attribute *attr, char *buf) |
| 626 | { |
| 627 | return sprintf(buf, "%llu\n", hispeed_freq); |
| 628 | } |
| 629 | |
| 630 | static ssize_t store_hispeed_freq(struct kobject *kobj, |
| 631 | struct attribute *attr, const char *buf, |
| 632 | size_t count) |
| 633 | { |
| 634 | int ret; |
| 635 | u64 val; |
| 636 | |
| 637 | ret = strict_strtoull(buf, 0, &val); |
| 638 | if (ret < 0) |
| 639 | return ret; |
| 640 | hispeed_freq = val; |
| 641 | return count; |
| 642 | } |
| 643 | |
| 644 | static struct global_attr hispeed_freq_attr = __ATTR(hispeed_freq, 0644, |
| 645 | show_hispeed_freq, store_hispeed_freq); |
| 646 | |
| 647 | |
| 648 | static ssize_t show_go_hispeed_load(struct kobject *kobj, |
| 649 | struct attribute *attr, char *buf) |
| 650 | { |
| 651 | return sprintf(buf, "%lu\n", go_hispeed_load); |
| 652 | } |
| 653 | |
| 654 | static ssize_t store_go_hispeed_load(struct kobject *kobj, |
| 655 | struct attribute *attr, const char *buf, size_t count) |
| 656 | { |
| 657 | int ret; |
| 658 | unsigned long val; |
| 659 | |
| 660 | ret = strict_strtoul(buf, 0, &val); |
| 661 | if (ret < 0) |
| 662 | return ret; |
| 663 | go_hispeed_load = val; |
| 664 | return count; |
| 665 | } |
| 666 | |
| 667 | static struct global_attr go_hispeed_load_attr = __ATTR(go_hispeed_load, 0644, |
| 668 | show_go_hispeed_load, store_go_hispeed_load); |
| 669 | |
| 670 | static ssize_t show_min_sample_time(struct kobject *kobj, |
| 671 | struct attribute *attr, char *buf) |
| 672 | { |
| 673 | return sprintf(buf, "%lu\n", min_sample_time); |
| 674 | } |
| 675 | |
| 676 | static ssize_t store_min_sample_time(struct kobject *kobj, |
| 677 | struct attribute *attr, const char *buf, size_t count) |
| 678 | { |
| 679 | int ret; |
| 680 | unsigned long val; |
| 681 | |
| 682 | ret = strict_strtoul(buf, 0, &val); |
| 683 | if (ret < 0) |
| 684 | return ret; |
| 685 | min_sample_time = val; |
| 686 | return count; |
| 687 | } |
| 688 | |
| 689 | static struct global_attr min_sample_time_attr = __ATTR(min_sample_time, 0644, |
| 690 | show_min_sample_time, store_min_sample_time); |
| 691 | |
Todd Poynor | cbbe17d | 2012-04-13 20:18:02 -0700 | [diff] [blame] | 692 | static ssize_t show_above_hispeed_delay(struct kobject *kobj, |
| 693 | struct attribute *attr, char *buf) |
| 694 | { |
| 695 | return sprintf(buf, "%lu\n", above_hispeed_delay_val); |
| 696 | } |
| 697 | |
| 698 | static ssize_t store_above_hispeed_delay(struct kobject *kobj, |
| 699 | struct attribute *attr, |
| 700 | const char *buf, size_t count) |
| 701 | { |
| 702 | int ret; |
| 703 | unsigned long val; |
| 704 | |
| 705 | ret = strict_strtoul(buf, 0, &val); |
| 706 | if (ret < 0) |
| 707 | return ret; |
| 708 | above_hispeed_delay_val = val; |
| 709 | return count; |
| 710 | } |
| 711 | |
| 712 | define_one_global_rw(above_hispeed_delay); |
| 713 | |
Mike Chan | ef96969 | 2010-06-22 11:26:45 -0700 | [diff] [blame] | 714 | static ssize_t show_timer_rate(struct kobject *kobj, |
| 715 | struct attribute *attr, char *buf) |
| 716 | { |
| 717 | return sprintf(buf, "%lu\n", timer_rate); |
| 718 | } |
| 719 | |
| 720 | static ssize_t store_timer_rate(struct kobject *kobj, |
| 721 | struct attribute *attr, const char *buf, size_t count) |
| 722 | { |
| 723 | int ret; |
| 724 | unsigned long val; |
| 725 | |
| 726 | ret = strict_strtoul(buf, 0, &val); |
| 727 | if (ret < 0) |
| 728 | return ret; |
| 729 | timer_rate = val; |
| 730 | return count; |
| 731 | } |
| 732 | |
| 733 | static struct global_attr timer_rate_attr = __ATTR(timer_rate, 0644, |
| 734 | show_timer_rate, store_timer_rate); |
| 735 | |
Todd Poynor | ab8dc40 | 2012-04-02 17:17:14 -0700 | [diff] [blame] | 736 | static ssize_t show_input_boost(struct kobject *kobj, struct attribute *attr, |
| 737 | char *buf) |
| 738 | { |
| 739 | return sprintf(buf, "%u\n", input_boost_val); |
| 740 | } |
| 741 | |
| 742 | static ssize_t store_input_boost(struct kobject *kobj, struct attribute *attr, |
| 743 | const char *buf, size_t count) |
| 744 | { |
| 745 | int ret; |
| 746 | unsigned long val; |
| 747 | |
| 748 | ret = strict_strtoul(buf, 0, &val); |
| 749 | if (ret < 0) |
| 750 | return ret; |
| 751 | input_boost_val = val; |
| 752 | return count; |
| 753 | } |
| 754 | |
| 755 | define_one_global_rw(input_boost); |
| 756 | |
Todd Poynor | 15a9ea0 | 2012-04-23 20:42:41 -0700 | [diff] [blame] | 757 | static ssize_t show_boost(struct kobject *kobj, struct attribute *attr, |
| 758 | char *buf) |
| 759 | { |
| 760 | return sprintf(buf, "%d\n", boost_val); |
| 761 | } |
| 762 | |
| 763 | static ssize_t store_boost(struct kobject *kobj, struct attribute *attr, |
| 764 | const char *buf, size_t count) |
| 765 | { |
| 766 | int ret; |
| 767 | unsigned long val; |
| 768 | |
| 769 | ret = kstrtoul(buf, 0, &val); |
| 770 | if (ret < 0) |
| 771 | return ret; |
| 772 | |
| 773 | boost_val = val; |
| 774 | |
Todd Poynor | 442a312 | 2012-05-03 00:16:55 -0700 | [diff] [blame] | 775 | if (boost_val) { |
| 776 | trace_cpufreq_interactive_boost("on"); |
Todd Poynor | 15a9ea0 | 2012-04-23 20:42:41 -0700 | [diff] [blame] | 777 | cpufreq_interactive_boost(); |
Todd Poynor | 442a312 | 2012-05-03 00:16:55 -0700 | [diff] [blame] | 778 | } else { |
| 779 | trace_cpufreq_interactive_unboost("off"); |
| 780 | } |
Todd Poynor | 15a9ea0 | 2012-04-23 20:42:41 -0700 | [diff] [blame] | 781 | |
| 782 | return count; |
| 783 | } |
| 784 | |
| 785 | define_one_global_rw(boost); |
| 786 | |
Todd Poynor | 442a312 | 2012-05-03 00:16:55 -0700 | [diff] [blame] | 787 | static ssize_t store_boostpulse(struct kobject *kobj, struct attribute *attr, |
| 788 | const char *buf, size_t count) |
| 789 | { |
| 790 | int ret; |
| 791 | unsigned long val; |
| 792 | |
| 793 | ret = kstrtoul(buf, 0, &val); |
| 794 | if (ret < 0) |
| 795 | return ret; |
| 796 | |
| 797 | trace_cpufreq_interactive_boost("pulse"); |
| 798 | cpufreq_interactive_boost(); |
| 799 | return count; |
| 800 | } |
| 801 | |
| 802 | static struct global_attr boostpulse = |
| 803 | __ATTR(boostpulse, 0200, NULL, store_boostpulse); |
| 804 | |
Mike Chan | ef96969 | 2010-06-22 11:26:45 -0700 | [diff] [blame] | 805 | static struct attribute *interactive_attributes[] = { |
| 806 | &hispeed_freq_attr.attr, |
| 807 | &go_hispeed_load_attr.attr, |
Todd Poynor | cbbe17d | 2012-04-13 20:18:02 -0700 | [diff] [blame] | 808 | &above_hispeed_delay.attr, |
Mike Chan | ef96969 | 2010-06-22 11:26:45 -0700 | [diff] [blame] | 809 | &min_sample_time_attr.attr, |
| 810 | &timer_rate_attr.attr, |
Todd Poynor | ab8dc40 | 2012-04-02 17:17:14 -0700 | [diff] [blame] | 811 | &input_boost.attr, |
Todd Poynor | 15a9ea0 | 2012-04-23 20:42:41 -0700 | [diff] [blame] | 812 | &boost.attr, |
Todd Poynor | 442a312 | 2012-05-03 00:16:55 -0700 | [diff] [blame] | 813 | &boostpulse.attr, |
Mike Chan | ef96969 | 2010-06-22 11:26:45 -0700 | [diff] [blame] | 814 | NULL, |
| 815 | }; |
| 816 | |
| 817 | static struct attribute_group interactive_attr_group = { |
| 818 | .attrs = interactive_attributes, |
| 819 | .name = "interactive", |
| 820 | }; |
| 821 | |
Sam Leffler | 3ab7c2b | 2012-06-27 10:12:04 -0700 | [diff] [blame] | 822 | static int cpufreq_interactive_idle_notifier(struct notifier_block *nb, |
| 823 | unsigned long val, |
| 824 | void *data) |
| 825 | { |
| 826 | switch (val) { |
| 827 | case IDLE_START: |
| 828 | cpufreq_interactive_idle_start(); |
| 829 | break; |
| 830 | case IDLE_END: |
| 831 | cpufreq_interactive_idle_end(); |
| 832 | break; |
| 833 | } |
| 834 | |
| 835 | return 0; |
| 836 | } |
| 837 | |
| 838 | static struct notifier_block cpufreq_interactive_idle_nb = { |
| 839 | .notifier_call = cpufreq_interactive_idle_notifier, |
| 840 | }; |
| 841 | |
Mike Chan | ef96969 | 2010-06-22 11:26:45 -0700 | [diff] [blame] | 842 | static int cpufreq_governor_interactive(struct cpufreq_policy *policy, |
| 843 | unsigned int event) |
| 844 | { |
| 845 | int rc; |
| 846 | unsigned int j; |
| 847 | struct cpufreq_interactive_cpuinfo *pcpu; |
| 848 | struct cpufreq_frequency_table *freq_table; |
| 849 | |
| 850 | switch (event) { |
| 851 | case CPUFREQ_GOV_START: |
| 852 | if (!cpu_online(policy->cpu)) |
| 853 | return -EINVAL; |
| 854 | |
| 855 | freq_table = |
| 856 | cpufreq_frequency_get_table(policy->cpu); |
| 857 | |
| 858 | for_each_cpu(j, policy->cpus) { |
| 859 | pcpu = &per_cpu(cpuinfo, j); |
| 860 | pcpu->policy = policy; |
| 861 | pcpu->target_freq = policy->cur; |
| 862 | pcpu->freq_table = freq_table; |
Todd Poynor | 1f408dc | 2012-04-06 19:59:36 -0700 | [diff] [blame] | 863 | pcpu->target_set_time_in_idle = |
Mike Chan | ef96969 | 2010-06-22 11:26:45 -0700 | [diff] [blame] | 864 | get_cpu_idle_time_us(j, |
Todd Poynor | 1f408dc | 2012-04-06 19:59:36 -0700 | [diff] [blame] | 865 | &pcpu->target_set_time); |
Todd Poynor | 6d15fa3 | 2012-04-26 21:41:40 -0700 | [diff] [blame] | 866 | pcpu->floor_freq = pcpu->target_freq; |
| 867 | pcpu->floor_validate_time = |
Todd Poynor | 8a833f1 | 2012-04-20 13:18:32 -0700 | [diff] [blame] | 868 | pcpu->target_set_time; |
Todd Poynor | 1a0389a | 2012-05-10 23:28:06 -0700 | [diff] [blame] | 869 | pcpu->hispeed_validate_time = |
| 870 | pcpu->target_set_time; |
Mike Chan | ef96969 | 2010-06-22 11:26:45 -0700 | [diff] [blame] | 871 | pcpu->governor_enabled = 1; |
| 872 | smp_wmb(); |
| 873 | } |
| 874 | |
| 875 | if (!hispeed_freq) |
| 876 | hispeed_freq = policy->max; |
| 877 | |
| 878 | /* |
| 879 | * Do not register the idle hook and create sysfs |
| 880 | * entries if we have already done so. |
| 881 | */ |
| 882 | if (atomic_inc_return(&active_count) > 1) |
| 883 | return 0; |
| 884 | |
| 885 | rc = sysfs_create_group(cpufreq_global_kobject, |
| 886 | &interactive_attr_group); |
| 887 | if (rc) |
| 888 | return rc; |
| 889 | |
Todd Poynor | ab8dc40 | 2012-04-02 17:17:14 -0700 | [diff] [blame] | 890 | rc = input_register_handler(&cpufreq_interactive_input_handler); |
| 891 | if (rc) |
| 892 | pr_warn("%s: failed to register input handler\n", |
| 893 | __func__); |
| 894 | |
Sam Leffler | 3ab7c2b | 2012-06-27 10:12:04 -0700 | [diff] [blame] | 895 | idle_notifier_register(&cpufreq_interactive_idle_nb); |
Mike Chan | ef96969 | 2010-06-22 11:26:45 -0700 | [diff] [blame] | 896 | break; |
| 897 | |
| 898 | case CPUFREQ_GOV_STOP: |
| 899 | for_each_cpu(j, policy->cpus) { |
| 900 | pcpu = &per_cpu(cpuinfo, j); |
| 901 | pcpu->governor_enabled = 0; |
| 902 | smp_wmb(); |
| 903 | del_timer_sync(&pcpu->cpu_timer); |
| 904 | |
| 905 | /* |
| 906 | * Reset idle exit time since we may cancel the timer |
| 907 | * before it can run after the last idle exit time, |
| 908 | * to avoid tripping the check in idle exit for a timer |
| 909 | * that is trying to run. |
| 910 | */ |
| 911 | pcpu->idle_exit_time = 0; |
| 912 | } |
| 913 | |
| 914 | flush_work(&freq_scale_down_work); |
| 915 | if (atomic_dec_return(&active_count) > 0) |
| 916 | return 0; |
| 917 | |
Sam Leffler | 3ab7c2b | 2012-06-27 10:12:04 -0700 | [diff] [blame] | 918 | idle_notifier_unregister(&cpufreq_interactive_idle_nb); |
Todd Poynor | ab8dc40 | 2012-04-02 17:17:14 -0700 | [diff] [blame] | 919 | input_unregister_handler(&cpufreq_interactive_input_handler); |
Mike Chan | ef96969 | 2010-06-22 11:26:45 -0700 | [diff] [blame] | 920 | sysfs_remove_group(cpufreq_global_kobject, |
| 921 | &interactive_attr_group); |
| 922 | |
| 923 | break; |
| 924 | |
| 925 | case CPUFREQ_GOV_LIMITS: |
| 926 | if (policy->max < policy->cur) |
| 927 | __cpufreq_driver_target(policy, |
| 928 | policy->max, CPUFREQ_RELATION_H); |
| 929 | else if (policy->min > policy->cur) |
| 930 | __cpufreq_driver_target(policy, |
| 931 | policy->min, CPUFREQ_RELATION_L); |
| 932 | break; |
| 933 | } |
| 934 | return 0; |
| 935 | } |
| 936 | |
Mike Chan | ef96969 | 2010-06-22 11:26:45 -0700 | [diff] [blame] | 937 | static int __init cpufreq_interactive_init(void) |
| 938 | { |
| 939 | unsigned int i; |
| 940 | struct cpufreq_interactive_cpuinfo *pcpu; |
| 941 | struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 }; |
| 942 | |
| 943 | go_hispeed_load = DEFAULT_GO_HISPEED_LOAD; |
| 944 | min_sample_time = DEFAULT_MIN_SAMPLE_TIME; |
Todd Poynor | cbbe17d | 2012-04-13 20:18:02 -0700 | [diff] [blame] | 945 | above_hispeed_delay_val = DEFAULT_ABOVE_HISPEED_DELAY; |
Mike Chan | ef96969 | 2010-06-22 11:26:45 -0700 | [diff] [blame] | 946 | timer_rate = DEFAULT_TIMER_RATE; |
| 947 | |
| 948 | /* Initalize per-cpu timers */ |
| 949 | for_each_possible_cpu(i) { |
| 950 | pcpu = &per_cpu(cpuinfo, i); |
| 951 | init_timer(&pcpu->cpu_timer); |
| 952 | pcpu->cpu_timer.function = cpufreq_interactive_timer; |
| 953 | pcpu->cpu_timer.data = i; |
| 954 | } |
| 955 | |
Sam Leffler | 5c9b827 | 2012-06-27 12:55:56 -0700 | [diff] [blame^] | 956 | spin_lock_init(&up_cpumask_lock); |
| 957 | spin_lock_init(&down_cpumask_lock); |
| 958 | mutex_init(&set_speed_lock); |
| 959 | |
Mike Chan | ef96969 | 2010-06-22 11:26:45 -0700 | [diff] [blame] | 960 | up_task = kthread_create(cpufreq_interactive_up_task, NULL, |
| 961 | "kinteractiveup"); |
| 962 | if (IS_ERR(up_task)) |
| 963 | return PTR_ERR(up_task); |
| 964 | |
| 965 | sched_setscheduler_nocheck(up_task, SCHED_FIFO, ¶m); |
| 966 | get_task_struct(up_task); |
| 967 | |
| 968 | /* No rescuer thread, bind to CPU queuing the work for possibly |
| 969 | warm cache (probably doesn't matter much). */ |
| 970 | down_wq = alloc_workqueue("knteractive_down", 0, 1); |
| 971 | |
| 972 | if (!down_wq) |
| 973 | goto err_freeuptask; |
| 974 | |
Sam Leffler | 5c9b827 | 2012-06-27 12:55:56 -0700 | [diff] [blame^] | 975 | INIT_WORK(&freq_scale_down_work, cpufreq_interactive_freq_down); |
Todd Poynor | ab8dc40 | 2012-04-02 17:17:14 -0700 | [diff] [blame] | 976 | INIT_WORK(&inputopen.inputopen_work, cpufreq_interactive_input_open); |
Sam Leffler | 5c9b827 | 2012-06-27 12:55:56 -0700 | [diff] [blame^] | 977 | |
| 978 | /* NB: wake up so the thread does not look hung to the freezer */ |
| 979 | wake_up_process(up_task); |
| 980 | |
Mike Chan | ef96969 | 2010-06-22 11:26:45 -0700 | [diff] [blame] | 981 | return cpufreq_register_governor(&cpufreq_gov_interactive); |
| 982 | |
| 983 | err_freeuptask: |
| 984 | put_task_struct(up_task); |
| 985 | return -ENOMEM; |
| 986 | } |
| 987 | |
| 988 | #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_INTERACTIVE |
| 989 | fs_initcall(cpufreq_interactive_init); |
| 990 | #else |
| 991 | module_init(cpufreq_interactive_init); |
| 992 | #endif |
| 993 | |
| 994 | static void __exit cpufreq_interactive_exit(void) |
| 995 | { |
| 996 | cpufreq_unregister_governor(&cpufreq_gov_interactive); |
| 997 | kthread_stop(up_task); |
| 998 | put_task_struct(up_task); |
| 999 | destroy_workqueue(down_wq); |
| 1000 | } |
| 1001 | |
| 1002 | module_exit(cpufreq_interactive_exit); |
| 1003 | |
| 1004 | MODULE_AUTHOR("Mike Chan <mike@android.com>"); |
| 1005 | MODULE_DESCRIPTION("'cpufreq_interactive' - A cpufreq governor for " |
| 1006 | "Latency sensitive workloads"); |
| 1007 | MODULE_LICENSE("GPL"); |