drivers/cpufreq/intel_pstate.c

   1 /*
   2  * intel_pstate.c: Native P state management for Intel processors
   3  *
   4  * (C) Copyright 2012 Intel Corporation
   5  * Author: Dirk Brandewie <dirk.j.brandewie@intel.com>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * as published by the Free Software Foundation; version 2
  10  * of the License.
  11  */
  12
  13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  14
  15 #include <linux/kernel.h>
  16 #include <linux/kernel_stat.h>
  17 #include <linux/module.h>
  18 #include <linux/ktime.h>
  19 #include <linux/hrtimer.h>
  20 #include <linux/tick.h>
  21 #include <linux/slab.h>
  22 #include <linux/sched/cpufreq.h>
  23 #include <linux/list.h>
  24 #include <linux/cpu.h>
  25 #include <linux/cpufreq.h>
  26 #include <linux/sysfs.h>
  27 #include <linux/types.h>
  28 #include <linux/fs.h>
  29 #include <linux/debugfs.h>
  30 #include <linux/acpi.h>
  31 #include <linux/vmalloc.h>
  32 #include <trace/events/power.h>
  33
  34 #include <asm/div64.h>
  35 #include <asm/msr.h>
  36 #include <asm/cpu_device_id.h>
  37 #include <asm/cpufeature.h>
  38 #include <asm/intel-family.h>
  39
  40 #define INTEL_PSTATE_SAMPLING_INTERVAL  (10 * NSEC_PER_MSEC)
  41
  42 #define INTEL_CPUFREQ_TRANSITION_LATENCY        20000
  43 #define INTEL_CPUFREQ_TRANSITION_DELAY          500
  44
  45 #ifdef CONFIG_ACPI
  46 #include <acpi/processor.h>
  47 #include <acpi/cppc_acpi.h>
  48 #endif
  49
  50 #define FRAC_BITS 8
  51 #define int_tofp(X) ((int64_t)(X) << FRAC_BITS)
  52 #define fp_toint(X) ((X) >> FRAC_BITS)
  53
  54 #define EXT_BITS 6
  55 #define EXT_FRAC_BITS (EXT_BITS + FRAC_BITS)
  56 #define fp_ext_toint(X) ((X) >> EXT_FRAC_BITS)
  57 #define int_ext_tofp(X) ((int64_t)(X) << EXT_FRAC_BITS)
  58
  59 static inline int32_t mul_fp(int32_t x, int32_t y)
  60 {
  61         return ((int64_t)x * (int64_t)y) >> FRAC_BITS;
  62 }
  63
  64 static inline int32_t div_fp(s64 x, s64 y)
  65 {
  66         return div64_s64((int64_t)x << FRAC_BITS, y);
  67 }
  68
  69 static inline int ceiling_fp(int32_t x)
  70 {
  71         int mask, ret;
  72
  73         ret = fp_toint(x);
  74         mask = (1 << FRAC_BITS) - 1;
  75         if (x & mask)
  76                 ret += 1;
  77         return ret;
  78 }
  79
  80 static inline int32_t percent_fp(int percent)
  81 {
  82         return div_fp(percent, 100);
  83 }
  84
  85 static inline u64 mul_ext_fp(u64 x, u64 y)
  86 {
  87         return (x * y) >> EXT_FRAC_BITS;
  88 }
  89
  90 static inline u64 div_ext_fp(u64 x, u64 y)
  91 {
  92         return div64_u64(x << EXT_FRAC_BITS, y);
  93 }
  94
  95 static inline int32_t percent_ext_fp(int percent)
  96 {
  97         return div_ext_fp(percent, 100);
  98 }
  99
 100 /**
 101  * struct sample -      Store performance sample
 102  * @core_avg_perf:      Ratio of APERF/MPERF which is the actual average
 103  *                      performance during last sample period
 104  * @busy_scaled:        Scaled busy value which is used to calculate next
 105  *                      P state. This can be different than core_avg_perf
 106  *                      to account for cpu idle period
 107  * @aperf:              Difference of actual performance frequency clock count
 108  *                      read from APERF MSR between last and current sample
 109  * @mperf:              Difference of maximum performance frequency clock count
 110  *                      read from MPERF MSR between last and current sample
 111  * @tsc:                Difference of time stamp counter between last and
 112  *                      current sample
 113  * @time:               Current time from scheduler
 114  *
 115  * This structure is used in the cpudata structure to store performance sample
 116  * data for choosing next P State.
 117  */
 118 struct sample {
 119         int32_t core_avg_perf;
 120         int32_t busy_scaled;
 121         u64 aperf;
 122         u64 mperf;
 123         u64 tsc;
 124         u64 time;
 125 };
 126
 127 /**
 128  * struct pstate_data - Store P state data
 129  * @current_pstate:     Current requested P state
 130  * @min_pstate:         Min P state possible for this platform
 131  * @max_pstate:         Max P state possible for this platform
 132  * @max_pstate_physical:This is physical Max P state for a processor
 133  *                      This can be higher than the max_pstate which can
 134  *                      be limited by platform thermal design power limits
 135  * @scaling:            Scaling factor to  convert frequency to cpufreq
 136  *                      frequency units
 137  * @turbo_pstate:       Max Turbo P state possible for this platform
 138  * @max_freq:           @max_pstate frequency in cpufreq units
 139  * @turbo_freq:         @turbo_pstate frequency in cpufreq units
 140  *
 141  * Stores the per cpu model P state limits and current P state.
 142  */
 143 struct pstate_data {
 144         int     current_pstate;
 145         int     min_pstate;
 146         int     max_pstate;
 147         int     max_pstate_physical;
 148         int     scaling;
 149         int     turbo_pstate;
 150         unsigned int max_freq;
 151         unsigned int turbo_freq;
 152 };
 153
 154 /**
 155  * struct vid_data -    Stores voltage information data
 156  * @min:                VID data for this platform corresponding to
 157  *                      the lowest P state
 158  * @max:                VID data corresponding to the highest P State.
 159  * @turbo:              VID data for turbo P state
 160  * @ratio:              Ratio of (vid max - vid min) /
 161  *                      (max P state - Min P State)
 162  *
 163  * Stores the voltage data for DVFS (Dynamic Voltage and Frequency Scaling)
 164  * This data is used in Atom platforms, where in addition to target P state,
 165  * the voltage data needs to be specified to select next P State.
 166  */
 167 struct vid_data {
 168         int min;
 169         int max;
 170         int turbo;
 171         int32_t ratio;
 172 };
 173
 174 /**
 175  * struct global_params - Global parameters, mostly tunable via sysfs.
 176  * @no_turbo:           Whether or not to use turbo P-states.
 177  * @turbo_disabled:     Whethet or not turbo P-states are available at all,
 178  *                      based on the MSR_IA32_MISC_ENABLE value and whether or
 179  *                      not the maximum reported turbo P-state is different from
 180  *                      the maximum reported non-turbo one.
 181  * @min_perf_pct:       Minimum capacity limit in percent of the maximum turbo
 182  *                      P-state capacity.
 183  * @max_perf_pct:       Maximum capacity limit in percent of the maximum turbo
 184  *                      P-state capacity.
 185  */
 186 struct global_params {
 187         bool no_turbo;
 188         bool turbo_disabled;
 189         int max_perf_pct;
 190         int min_perf_pct;
 191 };
 192
 193 /**
 194  * struct cpudata -     Per CPU instance data storage
 195  * @cpu:                CPU number for this instance data
 196  * @policy:             CPUFreq policy value
 197  * @update_util:        CPUFreq utility callback information
 198  * @update_util_set:    CPUFreq utility callback is set
 199  * @iowait_boost:       iowait-related boost fraction
 200  * @last_update:        Time of the last update.
 201  * @pstate:             Stores P state limits for this CPU
 202  * @vid:                Stores VID limits for this CPU
 203  * @last_sample_time:   Last Sample time
 204  * @aperf_mperf_shift:  Number of clock cycles after aperf, merf is incremented
 205  *                      This shift is a multiplier to mperf delta to
 206  *                      calculate CPU busy.
 207  * @prev_aperf:         Last APERF value read from APERF MSR
 208  * @prev_mperf:         Last MPERF value read from MPERF MSR
 209  * @prev_tsc:           Last timestamp counter (TSC) value
 210  * @prev_cummulative_iowait: IO Wait time difference from last and
 211  *                      current sample
 212  * @sample:             Storage for storing last Sample data
 213  * @min_perf_ratio:     Minimum capacity in terms of PERF or HWP ratios
 214  * @max_perf_ratio:     Maximum capacity in terms of PERF or HWP ratios
 215  * @acpi_perf_data:     Stores ACPI perf information read from _PSS
 216  * @valid_pss_table:    Set to true for valid ACPI _PSS entries found
 217  * @epp_powersave:      Last saved HWP energy performance preference
 218  *                      (EPP) or energy performance bias (EPB),
 219  *                      when policy switched to performance
 220  * @epp_policy:         Last saved policy used to set EPP/EPB
 221  * @epp_default:        Power on default HWP energy performance
 222  *                      preference/bias
 223  * @epp_saved:          Saved EPP/EPB during system suspend or CPU offline
 224  *                      operation
 225  *
 226  * This structure stores per CPU instance data for all CPUs.
 227  */
 228 struct cpudata {
 229         int cpu;
 230
 231         unsigned int policy;
 232         struct update_util_data update_util;
 233         bool   update_util_set;
 234
 235         struct pstate_data pstate;
 236         struct vid_data vid;
 237
 238         u64     last_update;
 239         u64     last_sample_time;
 240         u64     aperf_mperf_shift;
 241         u64     prev_aperf;
 242         u64     prev_mperf;
 243         u64     prev_tsc;
 244         u64     prev_cummulative_iowait;
 245         struct sample sample;
 246         int32_t min_perf_ratio;
 247         int32_t max_perf_ratio;
 248 #ifdef CONFIG_ACPI
 249         struct acpi_processor_performance acpi_perf_data;
 250         bool valid_pss_table;
 251 #endif
 252         unsigned int iowait_boost;
 253         s16 epp_powersave;
 254         s16 epp_policy;
 255         s16 epp_default;
 256         s16 epp_saved;
 257 };
 258
 259 static struct cpudata **all_cpu_data;
 260
 261 /**
 262  * struct pstate_funcs - Per CPU model specific callbacks
 263  * @get_max:            Callback to get maximum non turbo effective P state
 264  * @get_max_physical:   Callback to get maximum non turbo physical P state
 265  * @get_min:            Callback to get minimum P state
 266  * @get_turbo:          Callback to get turbo P state
 267  * @get_scaling:        Callback to get frequency scaling factor
 268  * @get_val:            Callback to convert P state to actual MSR write value
 269  * @get_vid:            Callback to get VID data for Atom platforms
 270  *
 271  * Core and Atom CPU models have different way to get P State limits. This
 272  * structure is used to store those callbacks.
 273  */
 274 struct pstate_funcs {
 275         int (*get_max)(void);
 276         int (*get_max_physical)(void);
 277         int (*get_min)(void);
 278         int (*get_turbo)(void);
 279         int (*get_scaling)(void);
 280         int (*get_aperf_mperf_shift)(void);
 281         u64 (*get_val)(struct cpudata*, int pstate);
 282         void (*get_vid)(struct cpudata *);
 283 };
 284
 285 static struct pstate_funcs pstate_funcs __read_mostly;
 286
 287 static int hwp_active __read_mostly;
 288 static bool per_cpu_limits __read_mostly;
 289
 290 static struct cpufreq_driver *intel_pstate_driver __read_mostly;
 291
 292 #ifdef CONFIG_ACPI
 293 static bool acpi_ppc;
 294 #endif
 295
 296 static struct global_params global;
 297
 298 static DEFINE_MUTEX(intel_pstate_driver_lock);
 299 static DEFINE_MUTEX(intel_pstate_limits_lock);
 300
 301 #ifdef CONFIG_ACPI
 302
 303 static bool intel_pstate_get_ppc_enable_status(void)
 304 {
 305         if (acpi_gbl_FADT.preferred_profile == PM_ENTERPRISE_SERVER ||
 306             acpi_gbl_FADT.preferred_profile == PM_PERFORMANCE_SERVER)
 307                 return true;
 308
 309         return acpi_ppc;
 310 }
 311
 312 #ifdef CONFIG_ACPI_CPPC_LIB
 313
 314 /* The work item is needed to avoid CPU hotplug locking issues */
 315 static void intel_pstste_sched_itmt_work_fn(struct work_struct *work)
 316 {
 317         sched_set_itmt_support();
 318 }
 319
 320 static DECLARE_WORK(sched_itmt_work, intel_pstste_sched_itmt_work_fn);
 321
 322 static void intel_pstate_set_itmt_prio(int cpu)
 323 {
 324         struct cppc_perf_caps cppc_perf;
 325         static u32 max_highest_perf = 0, min_highest_perf = U32_MAX;
 326         int ret;
 327
 328         ret = cppc_get_perf_caps(cpu, &cppc_perf);
 329         if (ret)
 330                 return;
 331
 332         /*
 333          * The priorities can be set regardless of whether or not
 334          * sched_set_itmt_support(true) has been called and it is valid to
 335          * update them at any time after it has been called.
 336          */
 337         sched_set_itmt_core_prio(cppc_perf.highest_perf, cpu);
 338
 339         if (max_highest_perf <= min_highest_perf) {
 340                 if (cppc_perf.highest_perf > max_highest_perf)
 341                         max_highest_perf = cppc_perf.highest_perf;
 342
 343                 if (cppc_perf.highest_perf < min_highest_perf)
 344                         min_highest_perf = cppc_perf.highest_perf;
 345
 346                 if (max_highest_perf > min_highest_perf) {
 347                         /*
 348                          * This code can be run during CPU online under the
 349                          * CPU hotplug locks, so sched_set_itmt_support()
 350                          * cannot be called from here.  Queue up a work item
 351                          * to invoke it.
 352                          */
 353                         schedule_work(&sched_itmt_work);
 354                 }
 355         }
 356 }
 357 #else
 358 static void intel_pstate_set_itmt_prio(int cpu)
 359 {
 360 }
 361 #endif
 362
 363 static void intel_pstate_init_acpi_perf_limits(struct cpufreq_policy *policy)
 364 {
 365         struct cpudata *cpu;
 366         int ret;
 367         int i;
 368
 369         if (hwp_active) {
 370                 intel_pstate_set_itmt_prio(policy->cpu);
 371                 return;
 372         }
 373
 374         if (!intel_pstate_get_ppc_enable_status())
 375                 return;
 376
 377         cpu = all_cpu_data[policy->cpu];
 378
 379         ret = acpi_processor_register_performance(&cpu->acpi_perf_data,
 380                                                   policy->cpu);
 381         if (ret)
 382                 return;
 383
 384         /*
 385          * Check if the control value in _PSS is for PERF_CTL MSR, which should
 386          * guarantee that the states returned by it map to the states in our
 387          * list directly.
 388          */
 389         if (cpu->acpi_perf_data.control_register.space_id !=
 390                                                 ACPI_ADR_SPACE_FIXED_HARDWARE)
 391                 goto err;
 392
 393         /*
 394          * If there is only one entry _PSS, simply ignore _PSS and continue as
 395          * usual without taking _PSS into account
 396          */
 397         if (cpu->acpi_perf_data.state_count < 2)
 398                 goto err;
 399
 400         pr_debug("CPU%u - ACPI _PSS perf data\n", policy->cpu);
 401         for (i = 0; i < cpu->acpi_perf_data.state_count; i++) {
 402                 pr_debug("     %cP%d: %u MHz, %u mW, 0x%x\n",
 403                          (i == cpu->acpi_perf_data.state ? '*' : ' '), i,
 404                          (u32) cpu->acpi_perf_data.states[i].core_frequency,
 405                          (u32) cpu->acpi_perf_data.states[i].power,
 406                          (u32) cpu->acpi_perf_data.states[i].control);
 407         }
 408
 409         /*
 410          * The _PSS table doesn't contain whole turbo frequency range.
 411          * This just contains +1 MHZ above the max non turbo frequency,
 412          * with control value corresponding to max turbo ratio. But
 413          * when cpufreq set policy is called, it will call with this
 414          * max frequency, which will cause a reduced performance as
 415          * this driver uses real max turbo frequency as the max
 416          * frequency. So correct this frequency in _PSS table to
 417          * correct max turbo frequency based on the turbo state.
 418          * Also need to convert to MHz as _PSS freq is in MHz.
 419          */
 420         if (!global.turbo_disabled)
 421                 cpu->acpi_perf_data.states[0].core_frequency =
 422                                         policy->cpuinfo.max_freq / 1000;
 423         cpu->valid_pss_table = true;
 424         pr_debug("_PPC limits will be enforced\n");
 425
 426         return;
 427
 428  err:
 429         cpu->valid_pss_table = false;
 430         acpi_processor_unregister_performance(policy->cpu);
 431 }
 432
 433 static void intel_pstate_exit_perf_limits(struct cpufreq_policy *policy)
 434 {
 435         struct cpudata *cpu;
 436
 437         cpu = all_cpu_data[policy->cpu];
 438         if (!cpu->valid_pss_table)
 439                 return;
 440
 441         acpi_processor_unregister_performance(policy->cpu);
 442 }
 443 #else
 444 static inline void intel_pstate_init_acpi_perf_limits(struct cpufreq_policy *policy)
 445 {
 446 }
 447
 448 static inline void intel_pstate_exit_perf_limits(struct cpufreq_policy *policy)
 449 {
 450 }
 451 #endif
 452
 453 static inline void update_turbo_state(void)
 454 {
 455         u64 misc_en;
 456         struct cpudata *cpu;
 457
 458         cpu = all_cpu_data[0];
 459         rdmsrl(MSR_IA32_MISC_ENABLE, misc_en);
 460         global.turbo_disabled =
 461                 (misc_en & MSR_IA32_MISC_ENABLE_TURBO_DISABLE ||
 462                  cpu->pstate.max_pstate == cpu->pstate.turbo_pstate);
 463 }
 464
 465 static int min_perf_pct_min(void)
 466 {
 467         struct cpudata *cpu = all_cpu_data[0];
 468         int turbo_pstate = cpu->pstate.turbo_pstate;
 469
 470         return turbo_pstate ?
 471                 (cpu->pstate.min_pstate * 100 / turbo_pstate) : 0;
 472 }
 473
 474 static s16 intel_pstate_get_epb(struct cpudata *cpu_data)
 475 {
 476         u64 epb;
 477         int ret;
 478
 479         if (!static_cpu_has(X86_FEATURE_EPB))
 480                 return -ENXIO;
 481
 482         ret = rdmsrl_on_cpu(cpu_data->cpu, MSR_IA32_ENERGY_PERF_BIAS, &epb);
 483         if (ret)
 484                 return (s16)ret;
 485
 486         return (s16)(epb & 0x0f);
 487 }
 488
 489 static s16 intel_pstate_get_epp(struct cpudata *cpu_data, u64 hwp_req_data)
 490 {
 491         s16 epp;
 492
 493         if (static_cpu_has(X86_FEATURE_HWP_EPP)) {
 494                 /*
 495                  * When hwp_req_data is 0, means that caller didn't read
 496                  * MSR_HWP_REQUEST, so need to read and get EPP.
 497                  */
 498                 if (!hwp_req_data) {
 499                         epp = rdmsrl_on_cpu(cpu_data->cpu, MSR_HWP_REQUEST,
 500                                             &hwp_req_data);
 501                         if (epp)
 502                                 return epp;
 503                 }
 504                 epp = (hwp_req_data >> 24) & 0xff;
 505         } else {
 506                 /* When there is no EPP present, HWP uses EPB settings */
 507                 epp = intel_pstate_get_epb(cpu_data);
 508         }
 509
 510         return epp;
 511 }
 512
 513 static int intel_pstate_set_epb(int cpu, s16 pref)
 514 {
 515         u64 epb;
 516         int ret;
 517
 518         if (!static_cpu_has(X86_FEATURE_EPB))
 519                 return -ENXIO;
 520
 521         ret = rdmsrl_on_cpu(cpu, MSR_IA32_ENERGY_PERF_BIAS, &epb);
 522         if (ret)
 523                 return ret;
 524
 525         epb = (epb & ~0x0f) | pref;
 526         wrmsrl_on_cpu(cpu, MSR_IA32_ENERGY_PERF_BIAS, epb);
 527
 528         return 0;
 529 }
 530
 531 /*
 532  * EPP/EPB display strings corresponding to EPP index in the
 533  * energy_perf_strings[]
 534  *      index           String
 535  *-------------------------------------
 536  *      0               default
 537  *      1               performance
 538  *      2               balance_performance
 539  *      3               balance_power
 540  *      4               power
 541  */
 542 static const char * const energy_perf_strings[] = {
 543         "default",
 544         "performance",
 545         "balance_performance",
 546         "balance_power",
 547         "power",
 548         NULL
 549 };
 550 static const unsigned int epp_values[] = {
 551         HWP_EPP_PERFORMANCE,
 552         HWP_EPP_BALANCE_PERFORMANCE,
 553         HWP_EPP_BALANCE_POWERSAVE,
 554         HWP_EPP_POWERSAVE
 555 };
 556
 557 static int intel_pstate_get_energy_pref_index(struct cpudata *cpu_data)
 558 {
 559         s16 epp;
 560         int index = -EINVAL;
 561
 562         epp = intel_pstate_get_epp(cpu_data, 0);
 563         if (epp < 0)
 564                 return epp;
 565
 566         if (static_cpu_has(X86_FEATURE_HWP_EPP)) {
 567                 if (epp == HWP_EPP_PERFORMANCE)
 568                         return 1;
 569                 if (epp <= HWP_EPP_BALANCE_PERFORMANCE)
 570                         return 2;
 571                 if (epp <= HWP_EPP_BALANCE_POWERSAVE)
 572                         return 3;
 573                 else
 574                         return 4;
 575         } else if (static_cpu_has(X86_FEATURE_EPB)) {
 576                 /*
 577                  * Range:
 578                  *      0x00-0x03       :       Performance
 579                  *      0x04-0x07       :       Balance performance
 580                  *      0x08-0x0B       :       Balance power
 581                  *      0x0C-0x0F       :       Power
 582                  * The EPB is a 4 bit value, but our ranges restrict the
 583                  * value which can be set. Here only using top two bits
 584                  * effectively.
 585                  */
 586                 index = (epp >> 2) + 1;
 587         }
 588
 589         return index;
 590 }
 591
 592 static int intel_pstate_set_energy_pref_index(struct cpudata *cpu_data,
 593                                               int pref_index)
 594 {
 595         int epp = -EINVAL;
 596         int ret;
 597
 598         if (!pref_index)
 599                 epp = cpu_data->epp_default;
 600
 601         mutex_lock(&intel_pstate_limits_lock);
 602
 603         if (static_cpu_has(X86_FEATURE_HWP_EPP)) {
 604                 u64 value;
 605
 606                 ret = rdmsrl_on_cpu(cpu_data->cpu, MSR_HWP_REQUEST, &value);
 607                 if (ret)
 608                         goto return_pref;
 609
 610                 value &= ~GENMASK_ULL(31, 24);
 611
 612                 if (epp == -EINVAL)
 613                         epp = epp_values[pref_index - 1];
 614
 615                 value |= (u64)epp << 24;
 616                 ret = wrmsrl_on_cpu(cpu_data->cpu, MSR_HWP_REQUEST, value);
 617         } else {
 618                 if (epp == -EINVAL)
 619                         epp = (pref_index - 1) << 2;
 620                 ret = intel_pstate_set_epb(cpu_data->cpu, epp);
 621         }
 622 return_pref:
 623         mutex_unlock(&intel_pstate_limits_lock);
 624
 625         return ret;
 626 }
 627
 628 static ssize_t show_energy_performance_available_preferences(
 629                                 struct cpufreq_policy *policy, char *buf)
 630 {
 631         int i = 0;
 632         int ret = 0;
 633
 634         while (energy_perf_strings[i] != NULL)
 635                 ret += sprintf(&buf[ret], "%s ", energy_perf_strings[i++]);
 636
 637         ret += sprintf(&buf[ret], "\n");
 638
 639         return ret;
 640 }
 641
 642 cpufreq_freq_attr_ro(energy_performance_available_preferences);
 643
 644 static ssize_t store_energy_performance_preference(
 645                 struct cpufreq_policy *policy, const char *buf, size_t count)
 646 {
 647         struct cpudata *cpu_data = all_cpu_data[policy->cpu];
 648         char str_preference[21];
 649         int ret, i = 0;
 650
 651         ret = sscanf(buf, "%20s", str_preference);
 652         if (ret != 1)
 653                 return -EINVAL;
 654
 655         while (energy_perf_strings[i] != NULL) {
 656                 if (!strcmp(str_preference, energy_perf_strings[i])) {
 657                         intel_pstate_set_energy_pref_index(cpu_data, i);
 658                         return count;
 659                 }
 660                 ++i;
 661         }
 662
 663         return -EINVAL;
 664 }
 665
 666 static ssize_t show_energy_performance_preference(
 667                                 struct cpufreq_policy *policy, char *buf)
 668 {
 669         struct cpudata *cpu_data = all_cpu_data[policy->cpu];
 670         int preference;
 671
 672         preference = intel_pstate_get_energy_pref_index(cpu_data);
 673         if (preference < 0)
 674                 return preference;
 675
 676         return  sprintf(buf, "%s\n", energy_perf_strings[preference]);
 677 }
 678
 679 cpufreq_freq_attr_rw(energy_performance_preference);
 680
 681 static struct freq_attr *hwp_cpufreq_attrs[] = {
 682         &energy_performance_preference,
 683         &energy_performance_available_preferences,
 684         NULL,
 685 };
 686
 687 static void intel_pstate_get_hwp_max(unsigned int cpu, int *phy_max,
 688                                      int *current_max)
 689 {
 690         u64 cap;
 691
 692         rdmsrl_on_cpu(cpu, MSR_HWP_CAPABILITIES, &cap);
 693         if (global.no_turbo)
 694                 *current_max = HWP_GUARANTEED_PERF(cap);
 695         else
 696                 *current_max = HWP_HIGHEST_PERF(cap);
 697
 698         *phy_max = HWP_HIGHEST_PERF(cap);
 699 }
 700
 701 static void intel_pstate_hwp_set(unsigned int cpu)
 702 {
 703         struct cpudata *cpu_data = all_cpu_data[cpu];
 704         int max, min;
 705         u64 value;
 706         s16 epp;
 707
 708         max = cpu_data->max_perf_ratio;
 709         min = cpu_data->min_perf_ratio;
 710
 711         if (cpu_data->policy == CPUFREQ_POLICY_PERFORMANCE)
 712                 min = max;
 713
 714         rdmsrl_on_cpu(cpu, MSR_HWP_REQUEST, &value);
 715
 716         value &= ~HWP_MIN_PERF(~0L);
 717         value |= HWP_MIN_PERF(min);
 718
 719         value &= ~HWP_MAX_PERF(~0L);
 720         value |= HWP_MAX_PERF(max);
 721
 722         if (cpu_data->epp_policy == cpu_data->policy)
 723                 goto skip_epp;
 724
 725         cpu_data->epp_policy = cpu_data->policy;
 726
 727         if (cpu_data->epp_saved >= 0) {
 728                 epp = cpu_data->epp_saved;
 729                 cpu_data->epp_saved = -EINVAL;
 730                 goto update_epp;
 731         }
 732
 733         if (cpu_data->policy == CPUFREQ_POLICY_PERFORMANCE) {
 734                 epp = intel_pstate_get_epp(cpu_data, value);
 735                 cpu_data->epp_powersave = epp;
 736                 /* If EPP read was failed, then don't try to write */
 737                 if (epp < 0)
 738                         goto skip_epp;
 739
 740                 epp = 0;
 741         } else {
 742                 /* skip setting EPP, when saved value is invalid */
 743                 if (cpu_data->epp_powersave < 0)
 744                         goto skip_epp;
 745
 746                 /*
 747                  * No need to restore EPP when it is not zero. This
 748                  * means:
 749                  *  - Policy is not changed
 750                  *  - user has manually changed
 751                  *  - Error reading EPB
 752                  */
 753                 epp = intel_pstate_get_epp(cpu_data, value);
 754                 if (epp)
 755                         goto skip_epp;
 756
 757                 epp = cpu_data->epp_powersave;
 758         }
 759 update_epp:
 760         if (static_cpu_has(X86_FEATURE_HWP_EPP)) {
 761                 value &= ~GENMASK_ULL(31, 24);
 762                 value |= (u64)epp << 24;
 763         } else {
 764                 intel_pstate_set_epb(cpu, epp);
 765         }
 766 skip_epp:
 767         wrmsrl_on_cpu(cpu, MSR_HWP_REQUEST, value);
 768 }
 769
 770 static int intel_pstate_hwp_save_state(struct cpufreq_policy *policy)
 771 {
 772         struct cpudata *cpu_data = all_cpu_data[policy->cpu];
 773
 774         if (!hwp_active)
 775                 return 0;
 776
 777         cpu_data->epp_saved = intel_pstate_get_epp(cpu_data, 0);
 778
 779         return 0;
 780 }
 781
 782 static int intel_pstate_resume(struct cpufreq_policy *policy)
 783 {
 784         if (!hwp_active)
 785                 return 0;
 786
 787         mutex_lock(&intel_pstate_limits_lock);
 788
 789         all_cpu_data[policy->cpu]->epp_policy = 0;
 790         intel_pstate_hwp_set(policy->cpu);
 791
 792         mutex_unlock(&intel_pstate_limits_lock);
 793
 794         return 0;
 795 }
 796
 797 static void intel_pstate_update_policies(void)
 798 {
 799         int cpu;
 800
 801         for_each_possible_cpu(cpu)
 802                 cpufreq_update_policy(cpu);
 803 }
 804
 805 /************************** sysfs begin ************************/
 806 #define show_one(file_name, object)                                     \
 807         static ssize_t show_##file_name                                 \
 808         (struct kobject *kobj, struct attribute *attr, char *buf)       \
 809         {                                                               \
 810                 return sprintf(buf, "%u\n", global.object);             \
 811         }
 812
 813 static ssize_t intel_pstate_show_status(char *buf);
 814 static int intel_pstate_update_status(const char *buf, size_t size);
 815
 816 static ssize_t show_status(struct kobject *kobj,
 817                            struct attribute *attr, char *buf)
 818 {
 819         ssize_t ret;
 820
 821         mutex_lock(&intel_pstate_driver_lock);
 822         ret = intel_pstate_show_status(buf);
 823         mutex_unlock(&intel_pstate_driver_lock);
 824
 825         return ret;
 826 }
 827
 828 static ssize_t store_status(struct kobject *a, struct attribute *b,
 829                             const char *buf, size_t count)
 830 {
 831         char *p = memchr(buf, '\n', count);
 832         int ret;
 833
 834         mutex_lock(&intel_pstate_driver_lock);
 835         ret = intel_pstate_update_status(buf, p ? p - buf : count);
 836         mutex_unlock(&intel_pstate_driver_lock);
 837
 838         return ret < 0 ? ret : count;
 839 }
 840
 841 static ssize_t show_turbo_pct(struct kobject *kobj,
 842                                 struct attribute *attr, char *buf)
 843 {
 844         struct cpudata *cpu;
 845         int total, no_turbo, turbo_pct;
 846         uint32_t turbo_fp;
 847
 848         mutex_lock(&intel_pstate_driver_lock);
 849
 850         if (!intel_pstate_driver) {
 851                 mutex_unlock(&intel_pstate_driver_lock);
 852                 return -EAGAIN;
 853         }
 854
 855         cpu = all_cpu_data[0];
 856
 857         total = cpu->pstate.turbo_pstate - cpu->pstate.min_pstate + 1;
 858         no_turbo = cpu->pstate.max_pstate - cpu->pstate.min_pstate + 1;
 859         turbo_fp = div_fp(no_turbo, total);
 860         turbo_pct = 100 - fp_toint(mul_fp(turbo_fp, int_tofp(100)));
 861
 862         mutex_unlock(&intel_pstate_driver_lock);
 863
 864         return sprintf(buf, "%u\n", turbo_pct);
 865 }
 866
 867 static ssize_t show_num_pstates(struct kobject *kobj,
 868                                 struct attribute *attr, char *buf)
 869 {
 870         struct cpudata *cpu;
 871         int total;
 872
 873         mutex_lock(&intel_pstate_driver_lock);
 874
 875         if (!intel_pstate_driver) {
 876                 mutex_unlock(&intel_pstate_driver_lock);
 877                 return -EAGAIN;
 878         }
 879
 880         cpu = all_cpu_data[0];
 881         total = cpu->pstate.turbo_pstate - cpu->pstate.min_pstate + 1;
 882
 883         mutex_unlock(&intel_pstate_driver_lock);
 884
 885         return sprintf(buf, "%u\n", total);
 886 }
 887
 888 static ssize_t show_no_turbo(struct kobject *kobj,
 889                              struct attribute *attr, char *buf)
 890 {
 891         ssize_t ret;
 892
 893         mutex_lock(&intel_pstate_driver_lock);
 894
 895         if (!intel_pstate_driver) {
 896                 mutex_unlock(&intel_pstate_driver_lock);
 897                 return -EAGAIN;
 898         }
 899
 900         update_turbo_state();
 901         if (global.turbo_disabled)
 902                 ret = sprintf(buf, "%u\n", global.turbo_disabled);
 903         else
 904                 ret = sprintf(buf, "%u\n", global.no_turbo);
 905
 906         mutex_unlock(&intel_pstate_driver_lock);
 907
 908         return ret;
 909 }
 910
 911 static ssize_t store_no_turbo(struct kobject *a, struct attribute *b,
 912                               const char *buf, size_t count)
 913 {
 914         unsigned int input;
 915         int ret;
 916
 917         ret = sscanf(buf, "%u", &input);
 918         if (ret != 1)
 919                 return -EINVAL;
 920
 921         mutex_lock(&intel_pstate_driver_lock);
 922
 923         if (!intel_pstate_driver) {
 924                 mutex_unlock(&intel_pstate_driver_lock);
 925                 return -EAGAIN;
 926         }
 927
 928         mutex_lock(&intel_pstate_limits_lock);
 929
 930         update_turbo_state();
 931         if (global.turbo_disabled) {
 932                 pr_warn("Turbo disabled by BIOS or unavailable on processor\n");
 933                 mutex_unlock(&intel_pstate_limits_lock);
 934                 mutex_unlock(&intel_pstate_driver_lock);
 935                 return -EPERM;
 936         }
 937
 938         global.no_turbo = clamp_t(int, input, 0, 1);
 939
 940         if (global.no_turbo) {
 941                 struct cpudata *cpu = all_cpu_data[0];
 942                 int pct = cpu->pstate.max_pstate * 100 / cpu->pstate.turbo_pstate;
 943
 944                 /* Squash the global minimum into the permitted range. */
 945                 if (global.min_perf_pct > pct)
 946                         global.min_perf_pct = pct;
 947         }
 948
 949         mutex_unlock(&intel_pstate_limits_lock);
 950
 951         intel_pstate_update_policies();
 952
 953         mutex_unlock(&intel_pstate_driver_lock);
 954
 955         return count;
 956 }
 957
 958 static ssize_t store_max_perf_pct(struct kobject *a, struct attribute *b,
 959                                   const char *buf, size_t count)
 960 {
 961         unsigned int input;
 962         int ret;
 963
 964         ret = sscanf(buf, "%u", &input);
 965         if (ret != 1)
 966                 return -EINVAL;
 967
 968         mutex_lock(&intel_pstate_driver_lock);
 969
 970         if (!intel_pstate_driver) {
 971                 mutex_unlock(&intel_pstate_driver_lock);
 972                 return -EAGAIN;
 973         }
 974
 975         mutex_lock(&intel_pstate_limits_lock);
 976
 977         global.max_perf_pct = clamp_t(int, input, global.min_perf_pct, 100);
 978
 979         mutex_unlock(&intel_pstate_limits_lock);
 980
 981         intel_pstate_update_policies();
 982
 983         mutex_unlock(&intel_pstate_driver_lock);
 984
 985         return count;
 986 }
 987
 988 static ssize_t store_min_perf_pct(struct kobject *a, struct attribute *b,
 989                                   const char *buf, size_t count)
 990 {
 991         unsigned int input;
 992         int ret;
 993
 994         ret = sscanf(buf, "%u", &input);
 995         if (ret != 1)
 996                 return -EINVAL;
 997
 998         mutex_lock(&intel_pstate_driver_lock);
 999
1000         if (!intel_pstate_driver) {
1001                 mutex_unlock(&intel_pstate_driver_lock);
1002                 return -EAGAIN;
1003         }
1004
1005         mutex_lock(&intel_pstate_limits_lock);
1006
1007         global.min_perf_pct = clamp_t(int, input,
1008                                       min_perf_pct_min(), global.max_perf_pct);
1009
1010         mutex_unlock(&intel_pstate_limits_lock);
1011
1012         intel_pstate_update_policies();
1013
1014         mutex_unlock(&intel_pstate_driver_lock);
1015
1016         return count;
1017 }
1018
1019 show_one(max_perf_pct, max_perf_pct);
1020 show_one(min_perf_pct, min_perf_pct);
1021
1022 define_one_global_rw(status);
1023 define_one_global_rw(no_turbo);
1024 define_one_global_rw(max_perf_pct);
1025 define_one_global_rw(min_perf_pct);
1026 define_one_global_ro(turbo_pct);
1027 define_one_global_ro(num_pstates);
1028
1029 static struct attribute *intel_pstate_attributes[] = {
1030         &status.attr,
1031         &no_turbo.attr,
1032         &turbo_pct.attr,
1033         &num_pstates.attr,
1034         NULL
1035 };
1036
1037 static const struct attribute_group intel_pstate_attr_group = {
1038         .attrs = intel_pstate_attributes,
1039 };
1040
1041 static void __init intel_pstate_sysfs_expose_params(void)
1042 {
1043         struct kobject *intel_pstate_kobject;
1044         int rc;
1045
1046         intel_pstate_kobject = kobject_create_and_add("intel_pstate",
1047                                                 &cpu_subsys.dev_root->kobj);
1048         if (WARN_ON(!intel_pstate_kobject))
1049                 return;
1050
1051         rc = sysfs_create_group(intel_pstate_kobject, &intel_pstate_attr_group);
1052         if (WARN_ON(rc))
1053                 return;
1054
1055         /*
1056          * If per cpu limits are enforced there are no global limits, so
1057          * return without creating max/min_perf_pct attributes
1058          */
1059         if (per_cpu_limits)
1060                 return;
1061
1062         rc = sysfs_create_file(intel_pstate_kobject, &max_perf_pct.attr);
1063         WARN_ON(rc);
1064
1065         rc = sysfs_create_file(intel_pstate_kobject, &min_perf_pct.attr);
1066         WARN_ON(rc);
1067
1068 }
1069 /************************** sysfs end ************************/
1070
1071 static void intel_pstate_hwp_enable(struct cpudata *cpudata)
1072 {
1073         /* First disable HWP notification interrupt as we don't process them */
1074         if (static_cpu_has(X86_FEATURE_HWP_NOTIFY))
1075                 wrmsrl_on_cpu(cpudata->cpu, MSR_HWP_INTERRUPT, 0x00);
1076
1077         wrmsrl_on_cpu(cpudata->cpu, MSR_PM_ENABLE, 0x1);
1078         cpudata->epp_policy = 0;
1079         if (cpudata->epp_default == -EINVAL)
1080                 cpudata->epp_default = intel_pstate_get_epp(cpudata, 0);
1081 }
1082
1083 #define MSR_IA32_POWER_CTL_BIT_EE       19
1084
1085 /* Disable energy efficiency optimization */
1086 static void intel_pstate_disable_ee(int cpu)
1087 {
1088         u64 power_ctl;
1089         int ret;
1090
1091         ret = rdmsrl_on_cpu(cpu, MSR_IA32_POWER_CTL, &power_ctl);
1092         if (ret)
1093                 return;
1094
1095         if (!(power_ctl & BIT(MSR_IA32_POWER_CTL_BIT_EE))) {
1096                 pr_info("Disabling energy efficiency optimization\n");
1097                 power_ctl |= BIT(MSR_IA32_POWER_CTL_BIT_EE);
1098                 wrmsrl_on_cpu(cpu, MSR_IA32_POWER_CTL, power_ctl);
1099         }
1100 }
1101
1102 static int atom_get_min_pstate(void)
1103 {
1104         u64 value;
1105
1106         rdmsrl(MSR_ATOM_CORE_RATIOS, value);
1107         return (value >> 8) & 0x7F;
1108 }
1109
1110 static int atom_get_max_pstate(void)
1111 {
1112         u64 value;
1113
1114         rdmsrl(MSR_ATOM_CORE_RATIOS, value);
1115         return (value >> 16) & 0x7F;
1116 }
1117
1118 static int atom_get_turbo_pstate(void)
1119 {
1120         u64 value;
1121
1122         rdmsrl(MSR_ATOM_CORE_TURBO_RATIOS, value);
1123         return value & 0x7F;
1124 }
1125
1126 static u64 atom_get_val(struct cpudata *cpudata, int pstate)
1127 {
1128         u64 val;
1129         int32_t vid_fp;
1130         u32 vid;
1131
1132         val = (u64)pstate << 8;
1133         if (global.no_turbo && !global.turbo_disabled)
1134                 val |= (u64)1 << 32;
1135
1136         vid_fp = cpudata->vid.min + mul_fp(
1137                 int_tofp(pstate - cpudata->pstate.min_pstate),
1138                 cpudata->vid.ratio);
1139
1140         vid_fp = clamp_t(int32_t, vid_fp, cpudata->vid.min, cpudata->vid.max);
1141         vid = ceiling_fp(vid_fp);
1142
1143         if (pstate > cpudata->pstate.max_pstate)
1144                 vid = cpudata->vid.turbo;
1145
1146         return val | vid;
1147 }
1148
1149 static int silvermont_get_scaling(void)
1150 {
1151         u64 value;
1152         int i;
1153         /* Defined in Table 35-6 from SDM (Sept 2015) */
1154         static int silvermont_freq_table[] = {
1155                 83300, 100000, 133300, 116700, 80000};
1156
1157         rdmsrl(MSR_FSB_FREQ, value);
1158         i = value & 0x7;
1159         WARN_ON(i > 4);
1160
1161         return silvermont_freq_table[i];
1162 }
1163
1164 static int airmont_get_scaling(void)
1165 {
1166         u64 value;
1167         int i;
1168         /* Defined in Table 35-10 from SDM (Sept 2015) */
1169         static int airmont_freq_table[] = {
1170                 83300, 100000, 133300, 116700, 80000,
1171                 93300, 90000, 88900, 87500};
1172
1173         rdmsrl(MSR_FSB_FREQ, value);
1174         i = value & 0xF;
1175         WARN_ON(i > 8);
1176
1177         return airmont_freq_table[i];
1178 }
1179
1180 static void atom_get_vid(struct cpudata *cpudata)
1181 {
1182         u64 value;
1183
1184         rdmsrl(MSR_ATOM_CORE_VIDS, value);
1185         cpudata->vid.min = int_tofp((value >> 8) & 0x7f);
1186         cpudata->vid.max = int_tofp((value >> 16) & 0x7f);
1187         cpudata->vid.ratio = div_fp(
1188                 cpudata->vid.max - cpudata->vid.min,
1189                 int_tofp(cpudata->pstate.max_pstate -
1190                         cpudata->pstate.min_pstate));
1191
1192         rdmsrl(MSR_ATOM_CORE_TURBO_VIDS, value);
1193         cpudata->vid.turbo = value & 0x7f;
1194 }
1195
1196 static int core_get_min_pstate(void)
1197 {
1198         u64 value;
1199
1200         rdmsrl(MSR_PLATFORM_INFO, value);
1201         return (value >> 40) & 0xFF;
1202 }
1203
1204 static int core_get_max_pstate_physical(void)
1205 {
1206         u64 value;
1207
1208         rdmsrl(MSR_PLATFORM_INFO, value);
1209         return (value >> 8) & 0xFF;
1210 }
1211
1212 static int core_get_tdp_ratio(u64 plat_info)
1213 {
1214         /* Check how many TDP levels present */
1215         if (plat_info & 0x600000000) {
1216                 u64 tdp_ctrl;
1217                 u64 tdp_ratio;
1218                 int tdp_msr;
1219                 int err;
1220
1221                 /* Get the TDP level (0, 1, 2) to get ratios */
1222                 err = rdmsrl_safe(MSR_CONFIG_TDP_CONTROL, &tdp_ctrl);
1223                 if (err)
1224                         return err;
1225
1226                 /* TDP MSR are continuous starting at 0x648 */
1227                 tdp_msr = MSR_CONFIG_TDP_NOMINAL + (tdp_ctrl & 0x03);
1228                 err = rdmsrl_safe(tdp_msr, &tdp_ratio);
1229                 if (err)
1230                         return err;
1231
1232                 /* For level 1 and 2, bits[23:16] contain the ratio */
1233                 if (tdp_ctrl & 0x03)
1234                         tdp_ratio >>= 16;
1235
1236                 tdp_ratio &= 0xff; /* ratios are only 8 bits long */
1237                 pr_debug("tdp_ratio %x\n", (int)tdp_ratio);
1238
1239                 return (int)tdp_ratio;
1240         }
1241
1242         return -ENXIO;
1243 }
1244
1245 static int core_get_max_pstate(void)
1246 {
1247         u64 tar;
1248         u64 plat_info;
1249         int max_pstate;
1250         int tdp_ratio;
1251         int err;
1252
1253         rdmsrl(MSR_PLATFORM_INFO, plat_info);
1254         max_pstate = (plat_info >> 8) & 0xFF;
1255
1256         tdp_ratio = core_get_tdp_ratio(plat_info);
1257         if (tdp_ratio <= 0)
1258                 return max_pstate;
1259
1260         if (hwp_active) {
1261                 /* Turbo activation ratio is not used on HWP platforms */
1262                 return tdp_ratio;
1263         }
1264
1265         err = rdmsrl_safe(MSR_TURBO_ACTIVATION_RATIO, &tar);
1266         if (!err) {
1267                 int tar_levels;
1268
1269                 /* Do some sanity checking for safety */
1270                 tar_levels = tar & 0xff;
1271                 if (tdp_ratio - 1 == tar_levels) {
1272                         max_pstate = tar_levels;
1273                         pr_debug("max_pstate=TAC %x\n", max_pstate);
1274                 }
1275         }
1276
1277         return max_pstate;
1278 }
1279
1280 static int core_get_turbo_pstate(void)
1281 {
1282         u64 value;
1283         int nont, ret;
1284
1285         rdmsrl(MSR_TURBO_RATIO_LIMIT, value);
1286         nont = core_get_max_pstate();
1287         ret = (value) & 255;
1288         if (ret <= nont)
1289                 ret = nont;
1290         return ret;
1291 }
1292
1293 static inline int core_get_scaling(void)
1294 {
1295         return 100000;
1296 }
1297
1298 static u64 core_get_val(struct cpudata *cpudata, int pstate)
1299 {
1300         u64 val;
1301
1302         val = (u64)pstate << 8;
1303         if (global.no_turbo && !global.turbo_disabled)
1304                 val |= (u64)1 << 32;
1305
1306         return val;
1307 }
1308
1309 static int knl_get_aperf_mperf_shift(void)
1310 {
1311         return 10;
1312 }
1313
1314 static int knl_get_turbo_pstate(void)
1315 {
1316         u64 value;
1317         int nont, ret;
1318
1319         rdmsrl(MSR_TURBO_RATIO_LIMIT, value);
1320         nont = core_get_max_pstate();
1321         ret = (((value) >> 8) & 0xFF);
1322         if (ret <= nont)
1323                 ret = nont;
1324         return ret;
1325 }
1326
1327 static int intel_pstate_get_base_pstate(struct cpudata *cpu)
1328 {
1329         return global.no_turbo || global.turbo_disabled ?
1330                         cpu->pstate.max_pstate : cpu->pstate.turbo_pstate;
1331 }
1332
1333 static void intel_pstate_set_pstate(struct cpudata *cpu, int pstate)
1334 {
1335         trace_cpu_frequency(pstate * cpu->pstate.scaling, cpu->cpu);
1336         cpu->pstate.current_pstate = pstate;
1337         /*
1338          * Generally, there is no guarantee that this code will always run on
1339          * the CPU being updated, so force the register update to run on the
1340          * right CPU.
1341          */
1342         wrmsrl_on_cpu(cpu->cpu, MSR_IA32_PERF_CTL,
1343                       pstate_funcs.get_val(cpu, pstate));
1344 }
1345
1346 static void intel_pstate_set_min_pstate(struct cpudata *cpu)
1347 {
1348         intel_pstate_set_pstate(cpu, cpu->pstate.min_pstate);
1349 }
1350
1351 static void intel_pstate_max_within_limits(struct cpudata *cpu)
1352 {
1353         int pstate;
1354
1355         update_turbo_state();
1356         pstate = intel_pstate_get_base_pstate(cpu);
1357         pstate = max(cpu->pstate.min_pstate, cpu->max_perf_ratio);
1358         intel_pstate_set_pstate(cpu, pstate);
1359 }
1360
1361 static void intel_pstate_get_cpu_pstates(struct cpudata *cpu)
1362 {
1363         cpu->pstate.min_pstate = pstate_funcs.get_min();
1364         cpu->pstate.max_pstate = pstate_funcs.get_max();
1365         cpu->pstate.max_pstate_physical = pstate_funcs.get_max_physical();
1366         cpu->pstate.turbo_pstate = pstate_funcs.get_turbo();
1367         cpu->pstate.scaling = pstate_funcs.get_scaling();
1368         cpu->pstate.max_freq = cpu->pstate.max_pstate * cpu->pstate.scaling;
1369         cpu->pstate.turbo_freq = cpu->pstate.turbo_pstate * cpu->pstate.scaling;
1370
1371         if (pstate_funcs.get_aperf_mperf_shift)
1372                 cpu->aperf_mperf_shift = pstate_funcs.get_aperf_mperf_shift();
1373
1374         if (pstate_funcs.get_vid)
1375                 pstate_funcs.get_vid(cpu);
1376
1377         intel_pstate_set_min_pstate(cpu);
1378 }
1379
1380 static inline void intel_pstate_calc_avg_perf(struct cpudata *cpu)
1381 {
1382         struct sample *sample = &cpu->sample;
1383
1384         sample->core_avg_perf = div_ext_fp(sample->aperf, sample->mperf);
1385 }
1386
1387 static inline bool intel_pstate_sample(struct cpudata *cpu, u64 time)
1388 {
1389         u64 aperf, mperf;
1390         unsigned long flags;
1391         u64 tsc;
1392
1393         local_irq_save(flags);
1394         rdmsrl(MSR_IA32_APERF, aperf);
1395         rdmsrl(MSR_IA32_MPERF, mperf);
1396         tsc = rdtsc();
1397         if (cpu->prev_mperf == mperf || cpu->prev_tsc == tsc) {
1398                 local_irq_restore(flags);
1399                 return false;
1400         }
1401         local_irq_restore(flags);
1402
1403         cpu->last_sample_time = cpu->sample.time;
1404         cpu->sample.time = time;
1405         cpu->sample.aperf = aperf;
1406         cpu->sample.mperf = mperf;
1407         cpu->sample.tsc =  tsc;
1408         cpu->sample.aperf -= cpu->prev_aperf;
1409         cpu->sample.mperf -= cpu->prev_mperf;
1410         cpu->sample.tsc -= cpu->prev_tsc;
1411
1412         cpu->prev_aperf = aperf;
1413         cpu->prev_mperf = mperf;
1414         cpu->prev_tsc = tsc;
1415         /*
1416          * First time this function is invoked in a given cycle, all of the
1417          * previous sample data fields are equal to zero or stale and they must
1418          * be populated with meaningful numbers for things to work, so assume
1419          * that sample.time will always be reset before setting the utilization
1420          * update hook and make the caller skip the sample then.
1421          */
1422         if (cpu->last_sample_time) {
1423                 intel_pstate_calc_avg_perf(cpu);
1424                 return true;
1425         }
1426         return false;
1427 }
1428
1429 static inline int32_t get_avg_frequency(struct cpudata *cpu)
1430 {
1431         return mul_ext_fp(cpu->sample.core_avg_perf, cpu_khz);
1432 }
1433
1434 static inline int32_t get_avg_pstate(struct cpudata *cpu)
1435 {
1436         return mul_ext_fp(cpu->pstate.max_pstate_physical,
1437                           cpu->sample.core_avg_perf);
1438 }
1439
1440 static inline int32_t get_target_pstate(struct cpudata *cpu)
1441 {
1442         struct sample *sample = &cpu->sample;
1443         int32_t busy_frac, boost;
1444         int target, avg_pstate;
1445
1446         busy_frac = div_fp(sample->mperf << cpu->aperf_mperf_shift,
1447                            sample->tsc);
1448
1449         boost = cpu->iowait_boost;
1450         cpu->iowait_boost >>= 1;
1451
1452         if (busy_frac < boost)
1453                 busy_frac = boost;
1454
1455         sample->busy_scaled = busy_frac * 100;
1456
1457         target = global.no_turbo || global.turbo_disabled ?
1458                         cpu->pstate.max_pstate : cpu->pstate.turbo_pstate;
1459         target += target >> 2;
1460         target = mul_fp(target, busy_frac);
1461         if (target < cpu->pstate.min_pstate)
1462                 target = cpu->pstate.min_pstate;
1463
1464         /*
1465          * If the average P-state during the previous cycle was higher than the
1466          * current target, add 50% of the difference to the target to reduce
1467          * possible performance oscillations and offset possible performance
1468          * loss related to moving the workload from one CPU to another within
1469          * a package/module.
1470          */
1471         avg_pstate = get_avg_pstate(cpu);
1472         if (avg_pstate > target)
1473                 target += (avg_pstate - target) >> 1;
1474
1475         return target;
1476 }
1477
1478 static int intel_pstate_prepare_request(struct cpudata *cpu, int pstate)
1479 {
1480         int max_pstate = intel_pstate_get_base_pstate(cpu);
1481         int min_pstate;
1482
1483         min_pstate = max(cpu->pstate.min_pstate, cpu->min_perf_ratio);
1484         max_pstate = max(min_pstate, cpu->max_perf_ratio);
1485         return clamp_t(int, pstate, min_pstate, max_pstate);
1486 }
1487
1488 static void intel_pstate_update_pstate(struct cpudata *cpu, int pstate)
1489 {
1490         if (pstate == cpu->pstate.current_pstate)
1491                 return;
1492
1493         cpu->pstate.current_pstate = pstate;
1494         wrmsrl(MSR_IA32_PERF_CTL, pstate_funcs.get_val(cpu, pstate));
1495 }
1496
1497 static void intel_pstate_adjust_pstate(struct cpudata *cpu)
1498 {
1499         int from = cpu->pstate.current_pstate;
1500         struct sample *sample;
1501         int target_pstate;
1502
1503         update_turbo_state();
1504
1505         target_pstate = get_target_pstate(cpu);
1506         target_pstate = intel_pstate_prepare_request(cpu, target_pstate);
1507         trace_cpu_frequency(target_pstate * cpu->pstate.scaling, cpu->cpu);
1508         intel_pstate_update_pstate(cpu, target_pstate);
1509
1510         sample = &cpu->sample;
1511         trace_pstate_sample(mul_ext_fp(100, sample->core_avg_perf),
1512                 fp_toint(sample->busy_scaled),
1513                 from,
1514                 cpu->pstate.current_pstate,
1515                 sample->mperf,
1516                 sample->aperf,
1517                 sample->tsc,
1518                 get_avg_frequency(cpu),
1519                 fp_toint(cpu->iowait_boost * 100));
1520 }
1521
1522 static void intel_pstate_update_util(struct update_util_data *data, u64 time,
1523                                      unsigned int flags)
1524 {
1525         struct cpudata *cpu = container_of(data, struct cpudata, update_util);
1526         u64 delta_ns;
1527
1528         /* Don't allow remote callbacks */
1529         if (smp_processor_id() != cpu->cpu)
1530                 return;
1531
1532         if (flags & SCHED_CPUFREQ_IOWAIT) {
1533                 cpu->iowait_boost = int_tofp(1);
1534                 cpu->last_update = time;
1535                 /*
1536                  * The last time the busy was 100% so P-state was max anyway
1537                  * so avoid overhead of computation.
1538                  */
1539                 if (fp_toint(cpu->sample.busy_scaled) == 100)
1540                         return;
1541
1542                 goto set_pstate;
1543         } else if (cpu->iowait_boost) {
1544                 /* Clear iowait_boost if the CPU may have been idle. */
1545                 delta_ns = time - cpu->last_update;
1546                 if (delta_ns > TICK_NSEC)
1547                         cpu->iowait_boost = 0;
1548         }
1549         cpu->last_update = time;
1550         delta_ns = time - cpu->sample.time;
1551         if ((s64)delta_ns < INTEL_PSTATE_SAMPLING_INTERVAL)
1552                 return;
1553
1554 set_pstate:
1555         if (intel_pstate_sample(cpu, time))
1556                 intel_pstate_adjust_pstate(cpu);
1557 }
1558
1559 static struct pstate_funcs core_funcs = {
1560         .get_max = core_get_max_pstate,
1561         .get_max_physical = core_get_max_pstate_physical,
1562         .get_min = core_get_min_pstate,
1563         .get_turbo = core_get_turbo_pstate,
1564         .get_scaling = core_get_scaling,
1565         .get_val = core_get_val,
1566 };
1567
1568 static const struct pstate_funcs silvermont_funcs = {
1569         .get_max = atom_get_max_pstate,
1570         .get_max_physical = atom_get_max_pstate,
1571         .get_min = atom_get_min_pstate,
1572         .get_turbo = atom_get_turbo_pstate,
1573         .get_val = atom_get_val,
1574         .get_scaling = silvermont_get_scaling,
1575         .get_vid = atom_get_vid,
1576 };
1577
1578 static const struct pstate_funcs airmont_funcs = {
1579         .get_max = atom_get_max_pstate,
1580         .get_max_physical = atom_get_max_pstate,
1581         .get_min = atom_get_min_pstate,
1582         .get_turbo = atom_get_turbo_pstate,
1583         .get_val = atom_get_val,
1584         .get_scaling = airmont_get_scaling,
1585         .get_vid = atom_get_vid,
1586 };
1587
1588 static const struct pstate_funcs knl_funcs = {
1589         .get_max = core_get_max_pstate,
1590         .get_max_physical = core_get_max_pstate_physical,
1591         .get_min = core_get_min_pstate,
1592         .get_turbo = knl_get_turbo_pstate,
1593         .get_aperf_mperf_shift = knl_get_aperf_mperf_shift,
1594         .get_scaling = core_get_scaling,
1595         .get_val = core_get_val,
1596 };
1597
1598 static const struct pstate_funcs bxt_funcs = {
1599         .get_max = core_get_max_pstate,
1600         .get_max_physical = core_get_max_pstate_physical,
1601         .get_min = core_get_min_pstate,
1602         .get_turbo = core_get_turbo_pstate,
1603         .get_scaling = core_get_scaling,
1604         .get_val = core_get_val,
1605 };
1606
1607 #define ICPU(model, policy) \
1608         { X86_VENDOR_INTEL, 6, model, X86_FEATURE_APERFMPERF,\
1609                         (unsigned long)&policy }
1610
1611 static const struct x86_cpu_id intel_pstate_cpu_ids[] = {
1612         ICPU(INTEL_FAM6_SANDYBRIDGE,            core_funcs),
1613         ICPU(INTEL_FAM6_SANDYBRIDGE_X,          core_funcs),
1614         ICPU(INTEL_FAM6_ATOM_SILVERMONT1,       silvermont_funcs),
1615         ICPU(INTEL_FAM6_IVYBRIDGE,              core_funcs),
1616         ICPU(INTEL_FAM6_HASWELL_CORE,           core_funcs),
1617         ICPU(INTEL_FAM6_BROADWELL_CORE,         core_funcs),
1618         ICPU(INTEL_FAM6_IVYBRIDGE_X,            core_funcs),
1619         ICPU(INTEL_FAM6_HASWELL_X,              core_funcs),
1620         ICPU(INTEL_FAM6_HASWELL_ULT,            core_funcs),
1621         ICPU(INTEL_FAM6_HASWELL_GT3E,           core_funcs),
1622         ICPU(INTEL_FAM6_BROADWELL_GT3E,         core_funcs),
1623         ICPU(INTEL_FAM6_ATOM_AIRMONT,           airmont_funcs),
1624         ICPU(INTEL_FAM6_SKYLAKE_MOBILE,         core_funcs),
1625         ICPU(INTEL_FAM6_BROADWELL_X,            core_funcs),
1626         ICPU(INTEL_FAM6_SKYLAKE_DESKTOP,        core_funcs),
1627         ICPU(INTEL_FAM6_BROADWELL_XEON_D,       core_funcs),
1628         ICPU(INTEL_FAM6_XEON_PHI_KNL,           knl_funcs),
1629         ICPU(INTEL_FAM6_XEON_PHI_KNM,           knl_funcs),
1630         ICPU(INTEL_FAM6_ATOM_GOLDMONT,          bxt_funcs),
1631         ICPU(INTEL_FAM6_ATOM_GEMINI_LAKE,       bxt_funcs),
1632         {}
1633 };
1634 MODULE_DEVICE_TABLE(x86cpu, intel_pstate_cpu_ids);
1635
1636 static const struct x86_cpu_id intel_pstate_cpu_oob_ids[] __initconst = {
1637         ICPU(INTEL_FAM6_BROADWELL_XEON_D, core_funcs),
1638         ICPU(INTEL_FAM6_BROADWELL_X, core_funcs),
1639         ICPU(INTEL_FAM6_SKYLAKE_X, core_funcs),
1640         {}
1641 };
1642
1643 static const struct x86_cpu_id intel_pstate_cpu_ee_disable_ids[] = {
1644         ICPU(INTEL_FAM6_KABYLAKE_DESKTOP, core_funcs),
1645         {}
1646 };
1647
1648 static int intel_pstate_init_cpu(unsigned int cpunum)
1649 {
1650         struct cpudata *cpu;
1651
1652         cpu = all_cpu_data[cpunum];
1653
1654         if (!cpu) {
1655                 cpu = kzalloc(sizeof(*cpu), GFP_KERNEL);
1656                 if (!cpu)
1657                         return -ENOMEM;
1658
1659                 all_cpu_data[cpunum] = cpu;
1660
1661                 cpu->epp_default = -EINVAL;
1662                 cpu->epp_powersave = -EINVAL;
1663                 cpu->epp_saved = -EINVAL;
1664         }
1665
1666         cpu = all_cpu_data[cpunum];
1667
1668         cpu->cpu = cpunum;
1669
1670         if (hwp_active) {
1671                 const struct x86_cpu_id *id;
1672
1673                 id = x86_match_cpu(intel_pstate_cpu_ee_disable_ids);
1674                 if (id)
1675                         intel_pstate_disable_ee(cpunum);
1676
1677                 intel_pstate_hwp_enable(cpu);
1678         }
1679
1680         intel_pstate_get_cpu_pstates(cpu);
1681
1682         pr_debug("controlling: cpu %d\n", cpunum);
1683
1684         return 0;
1685 }
1686
1687 static void intel_pstate_set_update_util_hook(unsigned int cpu_num)
1688 {
1689         struct cpudata *cpu = all_cpu_data[cpu_num];
1690
1691         if (hwp_active)
1692                 return;
1693
1694         if (cpu->update_util_set)
1695                 return;
1696
1697         /* Prevent intel_pstate_update_util() from using stale data. */
1698         cpu->sample.time = 0;
1699         cpufreq_add_update_util_hook(cpu_num, &cpu->update_util,
1700                                      intel_pstate_update_util);
1701         cpu->update_util_set = true;
1702 }
1703
1704 static void intel_pstate_clear_update_util_hook(unsigned int cpu)
1705 {
1706         struct cpudata *cpu_data = all_cpu_data[cpu];
1707
1708         if (!cpu_data->update_util_set)
1709                 return;
1710
1711         cpufreq_remove_update_util_hook(cpu);
1712         cpu_data->update_util_set = false;
1713         synchronize_sched();
1714 }
1715
1716 static int intel_pstate_get_max_freq(struct cpudata *cpu)
1717 {
1718         return global.turbo_disabled || global.no_turbo ?
1719                         cpu->pstate.max_freq : cpu->pstate.turbo_freq;
1720 }
1721
1722 static void intel_pstate_update_perf_limits(struct cpufreq_policy *policy,
1723                                             struct cpudata *cpu)
1724 {
1725         int max_freq = intel_pstate_get_max_freq(cpu);
1726         int32_t max_policy_perf, min_policy_perf;
1727         int max_state, turbo_max;
1728
1729         /*
1730          * HWP needs some special consideration, because on BDX the
1731          * HWP_REQUEST uses abstract value to represent performance
1732          * rather than pure ratios.
1733          */
1734         if (hwp_active) {
1735                 intel_pstate_get_hwp_max(cpu->cpu, &turbo_max, &max_state);
1736         } else {
1737                 max_state = intel_pstate_get_base_pstate(cpu);
1738                 turbo_max = cpu->pstate.turbo_pstate;
1739         }
1740
1741         max_policy_perf = max_state * policy->max / max_freq;
1742         if (policy->max == policy->min) {
1743                 min_policy_perf = max_policy_perf;
1744         } else {
1745                 min_policy_perf = max_state * policy->min / max_freq;
1746                 min_policy_perf = clamp_t(int32_t, min_policy_perf,
1747                                           0, max_policy_perf);
1748         }
1749
1750         pr_debug("cpu:%d max_state %d min_policy_perf:%d max_policy_perf:%d\n",
1751                  policy->cpu, max_state,
1752                  min_policy_perf, max_policy_perf);
1753
1754         /* Normalize user input to [min_perf, max_perf] */
1755         if (per_cpu_limits) {
1756                 cpu->min_perf_ratio = min_policy_perf;
1757                 cpu->max_perf_ratio = max_policy_perf;
1758         } else {
1759                 int32_t global_min, global_max;
1760
1761                 /* Global limits are in percent of the maximum turbo P-state. */
1762                 global_max = DIV_ROUND_UP(turbo_max * global.max_perf_pct, 100);
1763                 global_min = DIV_ROUND_UP(turbo_max * global.min_perf_pct, 100);
1764                 global_min = clamp_t(int32_t, global_min, 0, global_max);
1765
1766                 pr_debug("cpu:%d global_min:%d global_max:%d\n", policy->cpu,
1767                          global_min, global_max);
1768
1769                 cpu->min_perf_ratio = max(min_policy_perf, global_min);
1770                 cpu->min_perf_ratio = min(cpu->min_perf_ratio, max_policy_perf);
1771                 cpu->max_perf_ratio = min(max_policy_perf, global_max);
1772                 cpu->max_perf_ratio = max(min_policy_perf, cpu->max_perf_ratio);
1773
1774                 /* Make sure min_perf <= max_perf */
1775                 cpu->min_perf_ratio = min(cpu->min_perf_ratio,
1776                                           cpu->max_perf_ratio);
1777
1778         }
1779         pr_debug("cpu:%d max_perf_ratio:%d min_perf_ratio:%d\n", policy->cpu,
1780                  cpu->max_perf_ratio,
1781                  cpu->min_perf_ratio);
1782 }
1783
1784 static int intel_pstate_set_policy(struct cpufreq_policy *policy)
1785 {
1786         struct cpudata *cpu;
1787
1788         if (!policy->cpuinfo.max_freq)
1789                 return -ENODEV;
1790
1791         pr_debug("set_policy cpuinfo.max %u policy->max %u\n",
1792                  policy->cpuinfo.max_freq, policy->max);
1793
1794         cpu = all_cpu_data[policy->cpu];
1795         cpu->policy = policy->policy;
1796
1797         mutex_lock(&intel_pstate_limits_lock);
1798
1799         intel_pstate_update_perf_limits(policy, cpu);
1800
1801         if (cpu->policy == CPUFREQ_POLICY_PERFORMANCE) {
1802                 /*
1803                  * NOHZ_FULL CPUs need this as the governor callback may not
1804                  * be invoked on them.
1805                  */
1806                 intel_pstate_clear_update_util_hook(policy->cpu);
1807                 intel_pstate_max_within_limits(cpu);
1808         } else {
1809                 intel_pstate_set_update_util_hook(policy->cpu);
1810         }
1811
1812         if (hwp_active)
1813                 intel_pstate_hwp_set(policy->cpu);
1814
1815         mutex_unlock(&intel_pstate_limits_lock);
1816
1817         return 0;
1818 }
1819
1820 static void intel_pstate_adjust_policy_max(struct cpufreq_policy *policy,
1821                                          struct cpudata *cpu)
1822 {
1823         if (cpu->pstate.max_pstate_physical > cpu->pstate.max_pstate &&
1824             policy->max < policy->cpuinfo.max_freq &&
1825             policy->max > cpu->pstate.max_freq) {
1826                 pr_debug("policy->max > max non turbo frequency\n");
1827                 policy->max = policy->cpuinfo.max_freq;
1828         }
1829 }
1830
1831 static int intel_pstate_verify_policy(struct cpufreq_policy *policy)
1832 {
1833         struct cpudata *cpu = all_cpu_data[policy->cpu];
1834
1835         update_turbo_state();
1836         cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
1837                                      intel_pstate_get_max_freq(cpu));
1838
1839         if (policy->policy != CPUFREQ_POLICY_POWERSAVE &&
1840             policy->policy != CPUFREQ_POLICY_PERFORMANCE)
1841                 return -EINVAL;
1842
1843         intel_pstate_adjust_policy_max(policy, cpu);
1844
1845         return 0;
1846 }
1847
1848 static void intel_cpufreq_stop_cpu(struct cpufreq_policy *policy)
1849 {
1850         intel_pstate_set_min_pstate(all_cpu_data[policy->cpu]);
1851 }
1852
1853 static void intel_pstate_stop_cpu(struct cpufreq_policy *policy)
1854 {
1855         pr_debug("CPU %d exiting\n", policy->cpu);
1856
1857         intel_pstate_clear_update_util_hook(policy->cpu);
1858         if (hwp_active)
1859                 intel_pstate_hwp_save_state(policy);
1860         else
1861                 intel_cpufreq_stop_cpu(policy);
1862 }
1863
1864 static int intel_pstate_cpu_exit(struct cpufreq_policy *policy)
1865 {
1866         intel_pstate_exit_perf_limits(policy);
1867
1868         policy->fast_switch_possible = false;
1869
1870         return 0;
1871 }
1872
1873 static int __intel_pstate_cpu_init(struct cpufreq_policy *policy)
1874 {
1875         struct cpudata *cpu;
1876         int rc;
1877
1878         rc = intel_pstate_init_cpu(policy->cpu);
1879         if (rc)
1880                 return rc;
1881
1882         cpu = all_cpu_data[policy->cpu];
1883
1884         cpu->max_perf_ratio = 0xFF;
1885         cpu->min_perf_ratio = 0;
1886
1887         policy->min = cpu->pstate.min_pstate * cpu->pstate.scaling;
1888         policy->max = cpu->pstate.turbo_pstate * cpu->pstate.scaling;
1889
1890         /* cpuinfo and default policy values */
1891         policy->cpuinfo.min_freq = cpu->pstate.min_pstate * cpu->pstate.scaling;
1892         update_turbo_state();
1893         policy->cpuinfo.max_freq = global.turbo_disabled ?
1894                         cpu->pstate.max_pstate : cpu->pstate.turbo_pstate;
1895         policy->cpuinfo.max_freq *= cpu->pstate.scaling;
1896
1897         intel_pstate_init_acpi_perf_limits(policy);
1898
1899         policy->fast_switch_possible = true;
1900
1901         return 0;
1902 }
1903
1904 static int intel_pstate_cpu_init(struct cpufreq_policy *policy)
1905 {
1906         int ret = __intel_pstate_cpu_init(policy);
1907
1908         if (ret)
1909                 return ret;
1910
1911         if (IS_ENABLED(CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE))
1912                 policy->policy = CPUFREQ_POLICY_PERFORMANCE;
1913         else
1914                 policy->policy = CPUFREQ_POLICY_POWERSAVE;
1915
1916         return 0;
1917 }
1918
1919 static struct cpufreq_driver intel_pstate = {
1920         .flags          = CPUFREQ_CONST_LOOPS,
1921         .verify         = intel_pstate_verify_policy,
1922         .setpolicy      = intel_pstate_set_policy,
1923         .suspend        = intel_pstate_hwp_save_state,
1924         .resume         = intel_pstate_resume,
1925         .init           = intel_pstate_cpu_init,
1926         .exit           = intel_pstate_cpu_exit,
1927         .stop_cpu       = intel_pstate_stop_cpu,
1928         .name           = "intel_pstate",
1929 };
1930
1931 static int intel_cpufreq_verify_policy(struct cpufreq_policy *policy)
1932 {
1933         struct cpudata *cpu = all_cpu_data[policy->cpu];
1934
1935         update_turbo_state();
1936         cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
1937                                      intel_pstate_get_max_freq(cpu));
1938
1939         intel_pstate_adjust_policy_max(policy, cpu);
1940
1941         intel_pstate_update_perf_limits(policy, cpu);
1942
1943         return 0;
1944 }
1945
1946 static int intel_cpufreq_target(struct cpufreq_policy *policy,
1947                                 unsigned int target_freq,
1948                                 unsigned int relation)
1949 {
1950         struct cpudata *cpu = all_cpu_data[policy->cpu];
1951         struct cpufreq_freqs freqs;
1952         int target_pstate;
1953
1954         update_turbo_state();
1955
1956         freqs.old = policy->cur;
1957         freqs.new = target_freq;
1958
1959         cpufreq_freq_transition_begin(policy, &freqs);
1960         switch (relation) {
1961         case CPUFREQ_RELATION_L:
1962                 target_pstate = DIV_ROUND_UP(freqs.new, cpu->pstate.scaling);
1963                 break;
1964         case CPUFREQ_RELATION_H:
1965                 target_pstate = freqs.new / cpu->pstate.scaling;
1966                 break;
1967         default:
1968                 target_pstate = DIV_ROUND_CLOSEST(freqs.new, cpu->pstate.scaling);
1969                 break;
1970         }
1971         target_pstate = intel_pstate_prepare_request(cpu, target_pstate);
1972         if (target_pstate != cpu->pstate.current_pstate) {
1973                 cpu->pstate.current_pstate = target_pstate;
1974                 wrmsrl_on_cpu(policy->cpu, MSR_IA32_PERF_CTL,
1975                               pstate_funcs.get_val(cpu, target_pstate));
1976         }
1977         freqs.new = target_pstate * cpu->pstate.scaling;
1978         cpufreq_freq_transition_end(policy, &freqs, false);
1979
1980         return 0;
1981 }
1982
1983 static unsigned int intel_cpufreq_fast_switch(struct cpufreq_policy *policy,
1984                                               unsigned int target_freq)
1985 {
1986         struct cpudata *cpu = all_cpu_data[policy->cpu];
1987         int target_pstate;
1988
1989         update_turbo_state();
1990
1991         target_pstate = DIV_ROUND_UP(target_freq, cpu->pstate.scaling);
1992         target_pstate = intel_pstate_prepare_request(cpu, target_pstate);
1993         intel_pstate_update_pstate(cpu, target_pstate);
1994         return target_pstate * cpu->pstate.scaling;
1995 }
1996
1997 static int intel_cpufreq_cpu_init(struct cpufreq_policy *policy)
1998 {
1999         int ret = __intel_pstate_cpu_init(policy);
2000
2001         if (ret)
2002                 return ret;
2003
2004         policy->cpuinfo.transition_latency = INTEL_CPUFREQ_TRANSITION_LATENCY;
2005         policy->transition_delay_us = INTEL_CPUFREQ_TRANSITION_DELAY;
2006         /* This reflects the intel_pstate_get_cpu_pstates() setting. */
2007         policy->cur = policy->cpuinfo.min_freq;
2008
2009         return 0;
2010 }
2011
2012 static struct cpufreq_driver intel_cpufreq = {
2013         .flags          = CPUFREQ_CONST_LOOPS,
2014         .verify         = intel_cpufreq_verify_policy,
2015         .target         = intel_cpufreq_target,
2016         .fast_switch    = intel_cpufreq_fast_switch,
2017         .init           = intel_cpufreq_cpu_init,
2018         .exit           = intel_pstate_cpu_exit,
2019         .stop_cpu       = intel_cpufreq_stop_cpu,
2020         .name           = "intel_cpufreq",
2021 };
2022
2023 static struct cpufreq_driver *default_driver = &intel_pstate;
2024
2025 static void intel_pstate_driver_cleanup(void)
2026 {
2027         unsigned int cpu;
2028
2029         get_online_cpus();
2030         for_each_online_cpu(cpu) {
2031                 if (all_cpu_data[cpu]) {
2032                         if (intel_pstate_driver == &intel_pstate)
2033                                 intel_pstate_clear_update_util_hook(cpu);
2034
2035                         kfree(all_cpu_data[cpu]);
2036                         all_cpu_data[cpu] = NULL;
2037                 }
2038         }
2039         put_online_cpus();
2040         intel_pstate_driver = NULL;
2041 }
2042
2043 static int intel_pstate_register_driver(struct cpufreq_driver *driver)
2044 {
2045         int ret;
2046
2047         memset(&global, 0, sizeof(global));
2048         global.max_perf_pct = 100;
2049
2050         intel_pstate_driver = driver;
2051         ret = cpufreq_register_driver(intel_pstate_driver);
2052         if (ret) {
2053                 intel_pstate_driver_cleanup();
2054                 return ret;
2055         }
2056
2057         global.min_perf_pct = min_perf_pct_min();
2058
2059         return 0;
2060 }
2061
2062 static int intel_pstate_unregister_driver(void)
2063 {
2064         if (hwp_active)
2065                 return -EBUSY;
2066
2067         cpufreq_unregister_driver(intel_pstate_driver);
2068         intel_pstate_driver_cleanup();
2069
2070         return 0;
2071 }
2072
2073 static ssize_t intel_pstate_show_status(char *buf)
2074 {
2075         if (!intel_pstate_driver)
2076                 return sprintf(buf, "off\n");
2077
2078         return sprintf(buf, "%s\n", intel_pstate_driver == &intel_pstate ?
2079                                         "active" : "passive");
2080 }
2081
2082 static int intel_pstate_update_status(const char *buf, size_t size)
2083 {
2084         int ret;
2085
2086         if (size == 3 && !strncmp(buf, "off", size))
2087                 return intel_pstate_driver ?
2088                         intel_pstate_unregister_driver() : -EINVAL;
2089
2090         if (size == 6 && !strncmp(buf, "active", size)) {
2091                 if (intel_pstate_driver) {
2092                         if (intel_pstate_driver == &intel_pstate)
2093                                 return 0;
2094
2095                         ret = intel_pstate_unregister_driver();
2096                         if (ret)
2097                                 return ret;
2098                 }
2099
2100                 return intel_pstate_register_driver(&intel_pstate);
2101         }
2102
2103         if (size == 7 && !strncmp(buf, "passive", size)) {
2104                 if (intel_pstate_driver) {
2105                         if (intel_pstate_driver == &intel_cpufreq)
2106                                 return 0;
2107
2108                         ret = intel_pstate_unregister_driver();
2109                         if (ret)
2110                                 return ret;
2111                 }
2112
2113                 return intel_pstate_register_driver(&intel_cpufreq);
2114         }
2115
2116         return -EINVAL;
2117 }
2118
2119 static int no_load __initdata;
2120 static int no_hwp __initdata;
2121 static int hwp_only __initdata;
2122 static unsigned int force_load __initdata;
2123
2124 static int __init intel_pstate_msrs_not_valid(void)
2125 {
2126         if (!pstate_funcs.get_max() ||
2127             !pstate_funcs.get_min() ||
2128             !pstate_funcs.get_turbo())
2129                 return -ENODEV;
2130
2131         return 0;
2132 }
2133
2134 static void __init copy_cpu_funcs(struct pstate_funcs *funcs)
2135 {
2136         pstate_funcs.get_max   = funcs->get_max;
2137         pstate_funcs.get_max_physical = funcs->get_max_physical;
2138         pstate_funcs.get_min   = funcs->get_min;
2139         pstate_funcs.get_turbo = funcs->get_turbo;
2140         pstate_funcs.get_scaling = funcs->get_scaling;
2141         pstate_funcs.get_val   = funcs->get_val;
2142         pstate_funcs.get_vid   = funcs->get_vid;
2143         pstate_funcs.get_aperf_mperf_shift = funcs->get_aperf_mperf_shift;
2144 }
2145
2146 #ifdef CONFIG_ACPI
2147
2148 static bool __init intel_pstate_no_acpi_pss(void)
2149 {
2150         int i;
2151
2152         for_each_possible_cpu(i) {
2153                 acpi_status status;
2154                 union acpi_object *pss;
2155                 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
2156                 struct acpi_processor *pr = per_cpu(processors, i);
2157
2158                 if (!pr)
2159                         continue;
2160
2161                 status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
2162                 if (ACPI_FAILURE(status))
2163                         continue;
2164
2165                 pss = buffer.pointer;
2166                 if (pss && pss->type == ACPI_TYPE_PACKAGE) {
2167                         kfree(pss);
2168                         return false;
2169                 }
2170
2171                 kfree(pss);
2172         }
2173
2174         return true;
2175 }
2176
2177 static bool __init intel_pstate_has_acpi_ppc(void)
2178 {
2179         int i;
2180
2181         for_each_possible_cpu(i) {
2182                 struct acpi_processor *pr = per_cpu(processors, i);
2183
2184                 if (!pr)
2185                         continue;
2186                 if (acpi_has_method(pr->handle, "_PPC"))
2187                         return true;
2188         }
2189         return false;
2190 }
2191
2192 enum {
2193         PSS,
2194         PPC,
2195 };
2196
2197 /* Hardware vendor-specific info that has its own power management modes */
2198 static struct acpi_platform_list plat_info[] __initdata = {
2199         {"HP    ", "ProLiant", 0, ACPI_SIG_FADT, all_versions, 0, PSS},
2200         {"ORACLE", "X4-2    ", 0, ACPI_SIG_FADT, all_versions, 0, PPC},
2201         {"ORACLE", "X4-2L   ", 0, ACPI_SIG_FADT, all_versions, 0, PPC},
2202         {"ORACLE", "X4-2B   ", 0, ACPI_SIG_FADT, all_versions, 0, PPC},
2203         {"ORACLE", "X3-2    ", 0, ACPI_SIG_FADT, all_versions, 0, PPC},
2204         {"ORACLE", "X3-2L   ", 0, ACPI_SIG_FADT, all_versions, 0, PPC},
2205         {"ORACLE", "X3-2B   ", 0, ACPI_SIG_FADT, all_versions, 0, PPC},
2206         {"ORACLE", "X4470M2 ", 0, ACPI_SIG_FADT, all_versions, 0, PPC},
2207         {"ORACLE", "X4270M3 ", 0, ACPI_SIG_FADT, all_versions, 0, PPC},
2208         {"ORACLE", "X4270M2 ", 0, ACPI_SIG_FADT, all_versions, 0, PPC},
2209         {"ORACLE", "X4170M2 ", 0, ACPI_SIG_FADT, all_versions, 0, PPC},
2210         {"ORACLE", "X4170 M3", 0, ACPI_SIG_FADT, all_versions, 0, PPC},
2211         {"ORACLE", "X4275 M3", 0, ACPI_SIG_FADT, all_versions, 0, PPC},
2212         {"ORACLE", "X6-2    ", 0, ACPI_SIG_FADT, all_versions, 0, PPC},
2213         {"ORACLE", "Sudbury ", 0, ACPI_SIG_FADT, all_versions, 0, PPC},
2214         { } /* End */
2215 };
2216
2217 static bool __init intel_pstate_platform_pwr_mgmt_exists(void)
2218 {
2219         const struct x86_cpu_id *id;
2220         u64 misc_pwr;
2221         int idx;
2222
2223         id = x86_match_cpu(intel_pstate_cpu_oob_ids);
2224         if (id) {
2225                 rdmsrl(MSR_MISC_PWR_MGMT, misc_pwr);
2226                 if ( misc_pwr & (1 << 8))
2227                         return true;
2228         }
2229
2230         idx = acpi_match_platform_list(plat_info);
2231         if (idx < 0)
2232                 return false;
2233
2234         switch (plat_info[idx].data) {
2235         case PSS:
2236                 return intel_pstate_no_acpi_pss();
2237         case PPC:
2238                 return intel_pstate_has_acpi_ppc() && !force_load;
2239         }
2240
2241         return false;
2242 }
2243
2244 static void intel_pstate_request_control_from_smm(void)
2245 {
2246         /*
2247          * It may be unsafe to request P-states control from SMM if _PPC support
2248          * has not been enabled.
2249          */
2250         if (acpi_ppc)
2251                 acpi_processor_pstate_control();
2252 }
2253 #else /* CONFIG_ACPI not enabled */
2254 static inline bool intel_pstate_platform_pwr_mgmt_exists(void) { return false; }
2255 static inline bool intel_pstate_has_acpi_ppc(void) { return false; }
2256 static inline void intel_pstate_request_control_from_smm(void) {}
2257 #endif /* CONFIG_ACPI */
2258
2259 static const struct x86_cpu_id hwp_support_ids[] __initconst = {
2260         { X86_VENDOR_INTEL, 6, X86_MODEL_ANY, X86_FEATURE_HWP },
2261         {}
2262 };
2263
2264 static int __init intel_pstate_init(void)
2265 {
2266         int rc;
2267
2268         if (no_load)
2269                 return -ENODEV;
2270
2271         if (x86_match_cpu(hwp_support_ids)) {
2272                 copy_cpu_funcs(&core_funcs);
2273                 if (!no_hwp) {
2274                         hwp_active++;
2275                         intel_pstate.attr = hwp_cpufreq_attrs;
2276                         goto hwp_cpu_matched;
2277                 }
2278         } else {
2279                 const struct x86_cpu_id *id;
2280
2281                 id = x86_match_cpu(intel_pstate_cpu_ids);
2282                 if (!id)
2283                         return -ENODEV;
2284
2285                 copy_cpu_funcs((struct pstate_funcs *)id->driver_data);
2286         }
2287
2288         if (intel_pstate_msrs_not_valid())
2289                 return -ENODEV;
2290
2291 hwp_cpu_matched:
2292         /*
2293          * The Intel pstate driver will be ignored if the platform
2294          * firmware has its own power management modes.
2295          */
2296         if (intel_pstate_platform_pwr_mgmt_exists())
2297                 return -ENODEV;
2298
2299         if (!hwp_active && hwp_only)
2300                 return -ENOTSUPP;
2301
2302         pr_info("Intel P-state driver initializing\n");
2303
2304         all_cpu_data = vzalloc(sizeof(void *) * num_possible_cpus());
2305         if (!all_cpu_data)
2306                 return -ENOMEM;
2307
2308         intel_pstate_request_control_from_smm();
2309
2310         intel_pstate_sysfs_expose_params();
2311
2312         mutex_lock(&intel_pstate_driver_lock);
2313         rc = intel_pstate_register_driver(default_driver);
2314         mutex_unlock(&intel_pstate_driver_lock);
2315         if (rc)
2316                 return rc;
2317
2318         if (hwp_active)
2319                 pr_info("HWP enabled\n");
2320
2321         return 0;
2322 }
2323 device_initcall(intel_pstate_init);
2324
2325 static int __init intel_pstate_setup(char *str)
2326 {
2327         if (!str)
2328                 return -EINVAL;
2329
2330         if (!strcmp(str, "disable")) {
2331                 no_load = 1;
2332         } else if (!strcmp(str, "passive")) {
2333                 pr_info("Passive mode enabled\n");
2334                 default_driver = &intel_cpufreq;
2335                 no_hwp = 1;
2336         }
2337         if (!strcmp(str, "no_hwp")) {
2338                 pr_info("HWP disabled\n");
2339                 no_hwp = 1;
2340         }
2341         if (!strcmp(str, "force"))
2342                 force_load = 1;
2343         if (!strcmp(str, "hwp_only"))
2344                 hwp_only = 1;
2345         if (!strcmp(str, "per_cpu_perf_limits"))
2346                 per_cpu_limits = true;
2347
2348 #ifdef CONFIG_ACPI
2349         if (!strcmp(str, "support_acpi_ppc"))
2350                 acpi_ppc = true;
2351 #endif
2352
2353         return 0;
2354 }
2355 early_param("intel_pstate", intel_pstate_setup);
2356
2357 MODULE_AUTHOR("Dirk Brandewie <dirk.j.brandewie@intel.com>");
2358 MODULE_DESCRIPTION("'intel_pstate' - P state driver Intel Core processors");
2359 MODULE_LICENSE("GPL");