drivers/cpufreq/intel_pstate.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * intel_pstate.c: Native P state management for Intel processors
   4  *
   5  * (C) Copyright 2012 Intel Corporation
   6  * Author: Dirk Brandewie <dirk.j.brandewie@intel.com>
   7  */
   8
   9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  10
  11 #include <linux/kernel.h>
  12 #include <linux/kernel_stat.h>
  13 #include <linux/module.h>
  14 #include <linux/ktime.h>
  15 #include <linux/hrtimer.h>
  16 #include <linux/tick.h>
  17 #include <linux/slab.h>
  18 #include <linux/sched/cpufreq.h>
  19 #include <linux/list.h>
  20 #include <linux/cpu.h>
  21 #include <linux/cpufreq.h>
  22 #include <linux/sysfs.h>
  23 #include <linux/types.h>
  24 #include <linux/fs.h>
  25 #include <linux/acpi.h>
  26 #include <linux/vmalloc.h>
  27 #include <linux/pm_qos.h>
  28 #include <trace/events/power.h>
  29
  30 #include <asm/div64.h>
  31 #include <asm/msr.h>
  32 #include <asm/cpu_device_id.h>
  33 #include <asm/cpufeature.h>
  34 #include <asm/intel-family.h>
  35 #include "../drivers/thermal/intel/thermal_interrupt.h"
  36
  37 #define INTEL_PSTATE_SAMPLING_INTERVAL  (10 * NSEC_PER_MSEC)
  38
  39 #define INTEL_CPUFREQ_TRANSITION_LATENCY        20000
  40 #define INTEL_CPUFREQ_TRANSITION_DELAY_HWP      5000
  41 #define INTEL_CPUFREQ_TRANSITION_DELAY          500
  42
  43 #ifdef CONFIG_ACPI
  44 #include <acpi/processor.h>
  45 #include <acpi/cppc_acpi.h>
  46 #endif
  47
  48 #define FRAC_BITS 8
  49 #define int_tofp(X) ((int64_t)(X) << FRAC_BITS)
  50 #define fp_toint(X) ((X) >> FRAC_BITS)
  51
  52 #define ONE_EIGHTH_FP ((int64_t)1 << (FRAC_BITS - 3))
  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 u64 mul_ext_fp(u64 x, u64 y)
  81 {
  82         return (x * y) >> EXT_FRAC_BITS;
  83 }
  84
  85 static inline u64 div_ext_fp(u64 x, u64 y)
  86 {
  87         return div64_u64(x << EXT_FRAC_BITS, y);
  88 }
  89
  90 /**
  91  * struct sample -      Store performance sample
  92  * @core_avg_perf:      Ratio of APERF/MPERF which is the actual average
  93  *                      performance during last sample period
  94  * @busy_scaled:        Scaled busy value which is used to calculate next
  95  *                      P state. This can be different than core_avg_perf
  96  *                      to account for cpu idle period
  97  * @aperf:              Difference of actual performance frequency clock count
  98  *                      read from APERF MSR between last and current sample
  99  * @mperf:              Difference of maximum performance frequency clock count
 100  *                      read from MPERF MSR between last and current sample
 101  * @tsc:                Difference of time stamp counter between last and
 102  *                      current sample
 103  * @time:               Current time from scheduler
 104  *
 105  * This structure is used in the cpudata structure to store performance sample
 106  * data for choosing next P State.
 107  */
 108 struct sample {
 109         int32_t core_avg_perf;
 110         int32_t busy_scaled;
 111         u64 aperf;
 112         u64 mperf;
 113         u64 tsc;
 114         u64 time;
 115 };
 116
 117 /**
 118  * struct pstate_data - Store P state data
 119  * @current_pstate:     Current requested P state
 120  * @min_pstate:         Min P state possible for this platform
 121  * @max_pstate:         Max P state possible for this platform
 122  * @max_pstate_physical:This is physical Max P state for a processor
 123  *                      This can be higher than the max_pstate which can
 124  *                      be limited by platform thermal design power limits
 125  * @perf_ctl_scaling:   PERF_CTL P-state to frequency scaling factor
 126  * @scaling:            Scaling factor between performance and frequency
 127  * @turbo_pstate:       Max Turbo P state possible for this platform
 128  * @min_freq:           @min_pstate frequency in cpufreq units
 129  * @max_freq:           @max_pstate frequency in cpufreq units
 130  * @turbo_freq:         @turbo_pstate frequency in cpufreq units
 131  *
 132  * Stores the per cpu model P state limits and current P state.
 133  */
 134 struct pstate_data {
 135         int     current_pstate;
 136         int     min_pstate;
 137         int     max_pstate;
 138         int     max_pstate_physical;
 139         int     perf_ctl_scaling;
 140         int     scaling;
 141         int     turbo_pstate;
 142         unsigned int min_freq;
 143         unsigned int max_freq;
 144         unsigned int turbo_freq;
 145 };
 146
 147 /**
 148  * struct vid_data -    Stores voltage information data
 149  * @min:                VID data for this platform corresponding to
 150  *                      the lowest P state
 151  * @max:                VID data corresponding to the highest P State.
 152  * @turbo:              VID data for turbo P state
 153  * @ratio:              Ratio of (vid max - vid min) /
 154  *                      (max P state - Min P State)
 155  *
 156  * Stores the voltage data for DVFS (Dynamic Voltage and Frequency Scaling)
 157  * This data is used in Atom platforms, where in addition to target P state,
 158  * the voltage data needs to be specified to select next P State.
 159  */
 160 struct vid_data {
 161         int min;
 162         int max;
 163         int turbo;
 164         int32_t ratio;
 165 };
 166
 167 /**
 168  * struct global_params - Global parameters, mostly tunable via sysfs.
 169  * @no_turbo:           Whether or not to use turbo P-states.
 170  * @turbo_disabled:     Whether or not turbo P-states are available at all,
 171  *                      based on the MSR_IA32_MISC_ENABLE value and whether or
 172  *                      not the maximum reported turbo P-state is different from
 173  *                      the maximum reported non-turbo one.
 174  * @turbo_disabled_mf:  The @turbo_disabled value reflected by cpuinfo.max_freq.
 175  * @min_perf_pct:       Minimum capacity limit in percent of the maximum turbo
 176  *                      P-state capacity.
 177  * @max_perf_pct:       Maximum capacity limit in percent of the maximum turbo
 178  *                      P-state capacity.
 179  */
 180 struct global_params {
 181         bool no_turbo;
 182         bool turbo_disabled;
 183         bool turbo_disabled_mf;
 184         int max_perf_pct;
 185         int min_perf_pct;
 186 };
 187
 188 /**
 189  * struct cpudata -     Per CPU instance data storage
 190  * @cpu:                CPU number for this instance data
 191  * @policy:             CPUFreq policy value
 192  * @update_util:        CPUFreq utility callback information
 193  * @update_util_set:    CPUFreq utility callback is set
 194  * @iowait_boost:       iowait-related boost fraction
 195  * @last_update:        Time of the last update.
 196  * @pstate:             Stores P state limits for this CPU
 197  * @vid:                Stores VID limits for this CPU
 198  * @last_sample_time:   Last Sample time
 199  * @aperf_mperf_shift:  APERF vs MPERF counting frequency difference
 200  * @prev_aperf:         Last APERF value read from APERF MSR
 201  * @prev_mperf:         Last MPERF value read from MPERF MSR
 202  * @prev_tsc:           Last timestamp counter (TSC) value
 203  * @prev_cummulative_iowait: IO Wait time difference from last and
 204  *                      current sample
 205  * @sample:             Storage for storing last Sample data
 206  * @min_perf_ratio:     Minimum capacity in terms of PERF or HWP ratios
 207  * @max_perf_ratio:     Maximum capacity in terms of PERF or HWP ratios
 208  * @acpi_perf_data:     Stores ACPI perf information read from _PSS
 209  * @valid_pss_table:    Set to true for valid ACPI _PSS entries found
 210  * @epp_powersave:      Last saved HWP energy performance preference
 211  *                      (EPP) or energy performance bias (EPB),
 212  *                      when policy switched to performance
 213  * @epp_policy:         Last saved policy used to set EPP/EPB
 214  * @epp_default:        Power on default HWP energy performance
 215  *                      preference/bias
 216  * @epp_cached          Cached HWP energy-performance preference value
 217  * @hwp_req_cached:     Cached value of the last HWP Request MSR
 218  * @hwp_cap_cached:     Cached value of the last HWP Capabilities MSR
 219  * @last_io_update:     Last time when IO wake flag was set
 220  * @sched_flags:        Store scheduler flags for possible cross CPU update
 221  * @hwp_boost_min:      Last HWP boosted min performance
 222  * @suspended:          Whether or not the driver has been suspended.
 223  * @hwp_notify_work:    workqueue for HWP notifications.
 224  *
 225  * This structure stores per CPU instance data for all CPUs.
 226  */
 227 struct cpudata {
 228         int cpu;
 229
 230         unsigned int policy;
 231         struct update_util_data update_util;
 232         bool   update_util_set;
 233
 234         struct pstate_data pstate;
 235         struct vid_data vid;
 236
 237         u64     last_update;
 238         u64     last_sample_time;
 239         u64     aperf_mperf_shift;
 240         u64     prev_aperf;
 241         u64     prev_mperf;
 242         u64     prev_tsc;
 243         u64     prev_cummulative_iowait;
 244         struct sample sample;
 245         int32_t min_perf_ratio;
 246         int32_t max_perf_ratio;
 247 #ifdef CONFIG_ACPI
 248         struct acpi_processor_performance acpi_perf_data;
 249         bool valid_pss_table;
 250 #endif
 251         unsigned int iowait_boost;
 252         s16 epp_powersave;
 253         s16 epp_policy;
 254         s16 epp_default;
 255         s16 epp_cached;
 256         u64 hwp_req_cached;
 257         u64 hwp_cap_cached;
 258         u64 last_io_update;
 259         unsigned int sched_flags;
 260         u32 hwp_boost_min;
 261         bool suspended;
 262         struct delayed_work hwp_notify_work;
 263 };
 264
 265 static struct cpudata **all_cpu_data;
 266
 267 /**
 268  * struct pstate_funcs - Per CPU model specific callbacks
 269  * @get_max:            Callback to get maximum non turbo effective P state
 270  * @get_max_physical:   Callback to get maximum non turbo physical P state
 271  * @get_min:            Callback to get minimum P state
 272  * @get_turbo:          Callback to get turbo P state
 273  * @get_scaling:        Callback to get frequency scaling factor
 274  * @get_cpu_scaling:    Get frequency scaling factor for a given cpu
 275  * @get_aperf_mperf_shift: Callback to get the APERF vs MPERF frequency difference
 276  * @get_val:            Callback to convert P state to actual MSR write value
 277  * @get_vid:            Callback to get VID data for Atom platforms
 278  *
 279  * Core and Atom CPU models have different way to get P State limits. This
 280  * structure is used to store those callbacks.
 281  */
 282 struct pstate_funcs {
 283         int (*get_max)(void);
 284         int (*get_max_physical)(void);
 285         int (*get_min)(void);
 286         int (*get_turbo)(void);
 287         int (*get_scaling)(void);
 288         int (*get_cpu_scaling)(int cpu);
 289         int (*get_aperf_mperf_shift)(void);
 290         u64 (*get_val)(struct cpudata*, int pstate);
 291         void (*get_vid)(struct cpudata *);
 292 };
 293
 294 static struct pstate_funcs pstate_funcs __read_mostly;
 295
 296 static int hwp_active __read_mostly;
 297 static int hwp_mode_bdw __read_mostly;
 298 static bool per_cpu_limits __read_mostly;
 299 static bool hwp_boost __read_mostly;
 300
 301 static struct cpufreq_driver *intel_pstate_driver __read_mostly;
 302
 303 #ifdef CONFIG_ACPI
 304 static bool acpi_ppc;
 305 #endif
 306
 307 static struct global_params global;
 308
 309 static DEFINE_MUTEX(intel_pstate_driver_lock);
 310 static DEFINE_MUTEX(intel_pstate_limits_lock);
 311
 312 #ifdef CONFIG_ACPI
 313
 314 static bool intel_pstate_acpi_pm_profile_server(void)
 315 {
 316         if (acpi_gbl_FADT.preferred_profile == PM_ENTERPRISE_SERVER ||
 317             acpi_gbl_FADT.preferred_profile == PM_PERFORMANCE_SERVER)
 318                 return true;
 319
 320         return false;
 321 }
 322
 323 static bool intel_pstate_get_ppc_enable_status(void)
 324 {
 325         if (intel_pstate_acpi_pm_profile_server())
 326                 return true;
 327
 328         return acpi_ppc;
 329 }
 330
 331 #ifdef CONFIG_ACPI_CPPC_LIB
 332
 333 /* The work item is needed to avoid CPU hotplug locking issues */
 334 static void intel_pstste_sched_itmt_work_fn(struct work_struct *work)
 335 {
 336         sched_set_itmt_support();
 337 }
 338
 339 static DECLARE_WORK(sched_itmt_work, intel_pstste_sched_itmt_work_fn);
 340
 341 #define CPPC_MAX_PERF   U8_MAX
 342
 343 static void intel_pstate_set_itmt_prio(int cpu)
 344 {
 345         struct cppc_perf_caps cppc_perf;
 346         static u32 max_highest_perf = 0, min_highest_perf = U32_MAX;
 347         int ret;
 348
 349         ret = cppc_get_perf_caps(cpu, &cppc_perf);
 350         if (ret)
 351                 return;
 352
 353         /*
 354          * On some systems with overclocking enabled, CPPC.highest_perf is hardcoded to 0xff.
 355          * In this case we can't use CPPC.highest_perf to enable ITMT.
 356          * In this case we can look at MSR_HWP_CAPABILITIES bits [8:0] to decide.
 357          */
 358         if (cppc_perf.highest_perf == CPPC_MAX_PERF)
 359                 cppc_perf.highest_perf = HWP_HIGHEST_PERF(READ_ONCE(all_cpu_data[cpu]->hwp_cap_cached));
 360
 361         /*
 362          * The priorities can be set regardless of whether or not
 363          * sched_set_itmt_support(true) has been called and it is valid to
 364          * update them at any time after it has been called.
 365          */
 366         sched_set_itmt_core_prio(cppc_perf.highest_perf, cpu);
 367
 368         if (max_highest_perf <= min_highest_perf) {
 369                 if (cppc_perf.highest_perf > max_highest_perf)
 370                         max_highest_perf = cppc_perf.highest_perf;
 371
 372                 if (cppc_perf.highest_perf < min_highest_perf)
 373                         min_highest_perf = cppc_perf.highest_perf;
 374
 375                 if (max_highest_perf > min_highest_perf) {
 376                         /*
 377                          * This code can be run during CPU online under the
 378                          * CPU hotplug locks, so sched_set_itmt_support()
 379                          * cannot be called from here.  Queue up a work item
 380                          * to invoke it.
 381                          */
 382                         schedule_work(&sched_itmt_work);
 383                 }
 384         }
 385 }
 386
 387 static int intel_pstate_get_cppc_guaranteed(int cpu)
 388 {
 389         struct cppc_perf_caps cppc_perf;
 390         int ret;
 391
 392         ret = cppc_get_perf_caps(cpu, &cppc_perf);
 393         if (ret)
 394                 return ret;
 395
 396         if (cppc_perf.guaranteed_perf)
 397                 return cppc_perf.guaranteed_perf;
 398
 399         return cppc_perf.nominal_perf;
 400 }
 401
 402 static u32 intel_pstate_cppc_nominal(int cpu)
 403 {
 404         u64 nominal_perf;
 405
 406         if (cppc_get_nominal_perf(cpu, &nominal_perf))
 407                 return 0;
 408
 409         return nominal_perf;
 410 }
 411 #else /* CONFIG_ACPI_CPPC_LIB */
 412 static inline void intel_pstate_set_itmt_prio(int cpu)
 413 {
 414 }
 415 #endif /* CONFIG_ACPI_CPPC_LIB */
 416
 417 static void intel_pstate_init_acpi_perf_limits(struct cpufreq_policy *policy)
 418 {
 419         struct cpudata *cpu;
 420         int ret;
 421         int i;
 422
 423         if (hwp_active) {
 424                 intel_pstate_set_itmt_prio(policy->cpu);
 425                 return;
 426         }
 427
 428         if (!intel_pstate_get_ppc_enable_status())
 429                 return;
 430
 431         cpu = all_cpu_data[policy->cpu];
 432
 433         ret = acpi_processor_register_performance(&cpu->acpi_perf_data,
 434                                                   policy->cpu);
 435         if (ret)
 436                 return;
 437
 438         /*
 439          * Check if the control value in _PSS is for PERF_CTL MSR, which should
 440          * guarantee that the states returned by it map to the states in our
 441          * list directly.
 442          */
 443         if (cpu->acpi_perf_data.control_register.space_id !=
 444                                                 ACPI_ADR_SPACE_FIXED_HARDWARE)
 445                 goto err;
 446
 447         /*
 448          * If there is only one entry _PSS, simply ignore _PSS and continue as
 449          * usual without taking _PSS into account
 450          */
 451         if (cpu->acpi_perf_data.state_count < 2)
 452                 goto err;
 453
 454         pr_debug("CPU%u - ACPI _PSS perf data\n", policy->cpu);
 455         for (i = 0; i < cpu->acpi_perf_data.state_count; i++) {
 456                 pr_debug("     %cP%d: %u MHz, %u mW, 0x%x\n",
 457                          (i == cpu->acpi_perf_data.state ? '*' : ' '), i,
 458                          (u32) cpu->acpi_perf_data.states[i].core_frequency,
 459                          (u32) cpu->acpi_perf_data.states[i].power,
 460                          (u32) cpu->acpi_perf_data.states[i].control);
 461         }
 462
 463         /*
 464          * The _PSS table doesn't contain whole turbo frequency range.
 465          * This just contains +1 MHZ above the max non turbo frequency,
 466          * with control value corresponding to max turbo ratio. But
 467          * when cpufreq set policy is called, it will call with this
 468          * max frequency, which will cause a reduced performance as
 469          * this driver uses real max turbo frequency as the max
 470          * frequency. So correct this frequency in _PSS table to
 471          * correct max turbo frequency based on the turbo state.
 472          * Also need to convert to MHz as _PSS freq is in MHz.
 473          */
 474         if (!global.turbo_disabled)
 475                 cpu->acpi_perf_data.states[0].core_frequency =
 476                                         policy->cpuinfo.max_freq / 1000;
 477         cpu->valid_pss_table = true;
 478         pr_debug("_PPC limits will be enforced\n");
 479
 480         return;
 481
 482  err:
 483         cpu->valid_pss_table = false;
 484         acpi_processor_unregister_performance(policy->cpu);
 485 }
 486
 487 static void intel_pstate_exit_perf_limits(struct cpufreq_policy *policy)
 488 {
 489         struct cpudata *cpu;
 490
 491         cpu = all_cpu_data[policy->cpu];
 492         if (!cpu->valid_pss_table)
 493                 return;
 494
 495         acpi_processor_unregister_performance(policy->cpu);
 496 }
 497 #else /* CONFIG_ACPI */
 498 static inline void intel_pstate_init_acpi_perf_limits(struct cpufreq_policy *policy)
 499 {
 500 }
 501
 502 static inline void intel_pstate_exit_perf_limits(struct cpufreq_policy *policy)
 503 {
 504 }
 505
 506 static inline bool intel_pstate_acpi_pm_profile_server(void)
 507 {
 508         return false;
 509 }
 510 #endif /* CONFIG_ACPI */
 511
 512 #ifndef CONFIG_ACPI_CPPC_LIB
 513 static inline int intel_pstate_get_cppc_guaranteed(int cpu)
 514 {
 515         return -ENOTSUPP;
 516 }
 517 #endif /* CONFIG_ACPI_CPPC_LIB */
 518
 519 /**
 520  * intel_pstate_hybrid_hwp_adjust - Calibrate HWP performance levels.
 521  * @cpu: Target CPU.
 522  *
 523  * On hybrid processors, HWP may expose more performance levels than there are
 524  * P-states accessible through the PERF_CTL interface.  If that happens, the
 525  * scaling factor between HWP performance levels and CPU frequency will be less
 526  * than the scaling factor between P-state values and CPU frequency.
 527  *
 528  * In that case, adjust the CPU parameters used in computations accordingly.
 529  */
 530 static void intel_pstate_hybrid_hwp_adjust(struct cpudata *cpu)
 531 {
 532         int perf_ctl_max_phys = cpu->pstate.max_pstate_physical;
 533         int perf_ctl_scaling = cpu->pstate.perf_ctl_scaling;
 534         int perf_ctl_turbo = pstate_funcs.get_turbo();
 535         int turbo_freq = perf_ctl_turbo * perf_ctl_scaling;
 536         int scaling = cpu->pstate.scaling;
 537
 538         pr_debug("CPU%d: perf_ctl_max_phys = %d\n", cpu->cpu, perf_ctl_max_phys);
 539         pr_debug("CPU%d: perf_ctl_max = %d\n", cpu->cpu, pstate_funcs.get_max());
 540         pr_debug("CPU%d: perf_ctl_turbo = %d\n", cpu->cpu, perf_ctl_turbo);
 541         pr_debug("CPU%d: perf_ctl_scaling = %d\n", cpu->cpu, perf_ctl_scaling);
 542         pr_debug("CPU%d: HWP_CAP guaranteed = %d\n", cpu->cpu, cpu->pstate.max_pstate);
 543         pr_debug("CPU%d: HWP_CAP highest = %d\n", cpu->cpu, cpu->pstate.turbo_pstate);
 544         pr_debug("CPU%d: HWP-to-frequency scaling factor: %d\n", cpu->cpu, scaling);
 545
 546         /*
 547          * If the product of the HWP performance scaling factor and the HWP_CAP
 548          * highest performance is greater than the maximum turbo frequency
 549          * corresponding to the pstate_funcs.get_turbo() return value, the
 550          * scaling factor is too high, so recompute it to make the HWP_CAP
 551          * highest performance correspond to the maximum turbo frequency.
 552          */
 553         cpu->pstate.turbo_freq = cpu->pstate.turbo_pstate * scaling;
 554         if (turbo_freq < cpu->pstate.turbo_freq) {
 555                 cpu->pstate.turbo_freq = turbo_freq;
 556                 scaling = DIV_ROUND_UP(turbo_freq, cpu->pstate.turbo_pstate);
 557                 cpu->pstate.scaling = scaling;
 558
 559                 pr_debug("CPU%d: refined HWP-to-frequency scaling factor: %d\n",
 560                          cpu->cpu, scaling);
 561         }
 562
 563         cpu->pstate.max_freq = rounddown(cpu->pstate.max_pstate * scaling,
 564                                          perf_ctl_scaling);
 565
 566         cpu->pstate.max_pstate_physical =
 567                         DIV_ROUND_UP(perf_ctl_max_phys * perf_ctl_scaling,
 568                                      scaling);
 569
 570         cpu->pstate.min_freq = cpu->pstate.min_pstate * perf_ctl_scaling;
 571         /*
 572          * Cast the min P-state value retrieved via pstate_funcs.get_min() to
 573          * the effective range of HWP performance levels.
 574          */
 575         cpu->pstate.min_pstate = DIV_ROUND_UP(cpu->pstate.min_freq, scaling);
 576 }
 577
 578 static inline void update_turbo_state(void)
 579 {
 580         u64 misc_en;
 581         struct cpudata *cpu;
 582
 583         cpu = all_cpu_data[0];
 584         rdmsrl(MSR_IA32_MISC_ENABLE, misc_en);
 585         global.turbo_disabled =
 586                 (misc_en & MSR_IA32_MISC_ENABLE_TURBO_DISABLE ||
 587                  cpu->pstate.max_pstate == cpu->pstate.turbo_pstate);
 588 }
 589
 590 static int min_perf_pct_min(void)
 591 {
 592         struct cpudata *cpu = all_cpu_data[0];
 593         int turbo_pstate = cpu->pstate.turbo_pstate;
 594
 595         return turbo_pstate ?
 596                 (cpu->pstate.min_pstate * 100 / turbo_pstate) : 0;
 597 }
 598
 599 static s16 intel_pstate_get_epb(struct cpudata *cpu_data)
 600 {
 601         u64 epb;
 602         int ret;
 603
 604         if (!boot_cpu_has(X86_FEATURE_EPB))
 605                 return -ENXIO;
 606
 607         ret = rdmsrl_on_cpu(cpu_data->cpu, MSR_IA32_ENERGY_PERF_BIAS, &epb);
 608         if (ret)
 609                 return (s16)ret;
 610
 611         return (s16)(epb & 0x0f);
 612 }
 613
 614 static s16 intel_pstate_get_epp(struct cpudata *cpu_data, u64 hwp_req_data)
 615 {
 616         s16 epp;
 617
 618         if (boot_cpu_has(X86_FEATURE_HWP_EPP)) {
 619                 /*
 620                  * When hwp_req_data is 0, means that caller didn't read
 621                  * MSR_HWP_REQUEST, so need to read and get EPP.
 622                  */
 623                 if (!hwp_req_data) {
 624                         epp = rdmsrl_on_cpu(cpu_data->cpu, MSR_HWP_REQUEST,
 625                                             &hwp_req_data);
 626                         if (epp)
 627                                 return epp;
 628                 }
 629                 epp = (hwp_req_data >> 24) & 0xff;
 630         } else {
 631                 /* When there is no EPP present, HWP uses EPB settings */
 632                 epp = intel_pstate_get_epb(cpu_data);
 633         }
 634
 635         return epp;
 636 }
 637
 638 static int intel_pstate_set_epb(int cpu, s16 pref)
 639 {
 640         u64 epb;
 641         int ret;
 642
 643         if (!boot_cpu_has(X86_FEATURE_EPB))
 644                 return -ENXIO;
 645
 646         ret = rdmsrl_on_cpu(cpu, MSR_IA32_ENERGY_PERF_BIAS, &epb);
 647         if (ret)
 648                 return ret;
 649
 650         epb = (epb & ~0x0f) | pref;
 651         wrmsrl_on_cpu(cpu, MSR_IA32_ENERGY_PERF_BIAS, epb);
 652
 653         return 0;
 654 }
 655
 656 /*
 657  * EPP/EPB display strings corresponding to EPP index in the
 658  * energy_perf_strings[]
 659  *      index           String
 660  *-------------------------------------
 661  *      0               default
 662  *      1               performance
 663  *      2               balance_performance
 664  *      3               balance_power
 665  *      4               power
 666  */
 667
 668 enum energy_perf_value_index {
 669         EPP_INDEX_DEFAULT = 0,
 670         EPP_INDEX_PERFORMANCE,
 671         EPP_INDEX_BALANCE_PERFORMANCE,
 672         EPP_INDEX_BALANCE_POWERSAVE,
 673         EPP_INDEX_POWERSAVE,
 674 };
 675
 676 static const char * const energy_perf_strings[] = {
 677         [EPP_INDEX_DEFAULT] = "default",
 678         [EPP_INDEX_PERFORMANCE] = "performance",
 679         [EPP_INDEX_BALANCE_PERFORMANCE] = "balance_performance",
 680         [EPP_INDEX_BALANCE_POWERSAVE] = "balance_power",
 681         [EPP_INDEX_POWERSAVE] = "power",
 682         NULL
 683 };
 684 static unsigned int epp_values[] = {
 685         [EPP_INDEX_DEFAULT] = 0, /* Unused index */
 686         [EPP_INDEX_PERFORMANCE] = HWP_EPP_PERFORMANCE,
 687         [EPP_INDEX_BALANCE_PERFORMANCE] = HWP_EPP_BALANCE_PERFORMANCE,
 688         [EPP_INDEX_BALANCE_POWERSAVE] = HWP_EPP_BALANCE_POWERSAVE,
 689         [EPP_INDEX_POWERSAVE] = HWP_EPP_POWERSAVE,
 690 };
 691
 692 static int intel_pstate_get_energy_pref_index(struct cpudata *cpu_data, int *raw_epp)
 693 {
 694         s16 epp;
 695         int index = -EINVAL;
 696
 697         *raw_epp = 0;
 698         epp = intel_pstate_get_epp(cpu_data, 0);
 699         if (epp < 0)
 700                 return epp;
 701
 702         if (boot_cpu_has(X86_FEATURE_HWP_EPP)) {
 703                 if (epp == epp_values[EPP_INDEX_PERFORMANCE])
 704                         return EPP_INDEX_PERFORMANCE;
 705                 if (epp == epp_values[EPP_INDEX_BALANCE_PERFORMANCE])
 706                         return EPP_INDEX_BALANCE_PERFORMANCE;
 707                 if (epp == epp_values[EPP_INDEX_BALANCE_POWERSAVE])
 708                         return EPP_INDEX_BALANCE_POWERSAVE;
 709                 if (epp == epp_values[EPP_INDEX_POWERSAVE])
 710                         return EPP_INDEX_POWERSAVE;
 711                 *raw_epp = epp;
 712                 return 0;
 713         } else if (boot_cpu_has(X86_FEATURE_EPB)) {
 714                 /*
 715                  * Range:
 716                  *      0x00-0x03       :       Performance
 717                  *      0x04-0x07       :       Balance performance
 718                  *      0x08-0x0B       :       Balance power
 719                  *      0x0C-0x0F       :       Power
 720                  * The EPB is a 4 bit value, but our ranges restrict the
 721                  * value which can be set. Here only using top two bits
 722                  * effectively.
 723                  */
 724                 index = (epp >> 2) + 1;
 725         }
 726
 727         return index;
 728 }
 729
 730 static int intel_pstate_set_epp(struct cpudata *cpu, u32 epp)
 731 {
 732         int ret;
 733
 734         /*
 735          * Use the cached HWP Request MSR value, because in the active mode the
 736          * register itself may be updated by intel_pstate_hwp_boost_up() or
 737          * intel_pstate_hwp_boost_down() at any time.
 738          */
 739         u64 value = READ_ONCE(cpu->hwp_req_cached);
 740
 741         value &= ~GENMASK_ULL(31, 24);
 742         value |= (u64)epp << 24;
 743         /*
 744          * The only other updater of hwp_req_cached in the active mode,
 745          * intel_pstate_hwp_set(), is called under the same lock as this
 746          * function, so it cannot run in parallel with the update below.
 747          */
 748         WRITE_ONCE(cpu->hwp_req_cached, value);
 749         ret = wrmsrl_on_cpu(cpu->cpu, MSR_HWP_REQUEST, value);
 750         if (!ret)
 751                 cpu->epp_cached = epp;
 752
 753         return ret;
 754 }
 755
 756 static int intel_pstate_set_energy_pref_index(struct cpudata *cpu_data,
 757                                               int pref_index, bool use_raw,
 758                                               u32 raw_epp)
 759 {
 760         int epp = -EINVAL;
 761         int ret;
 762
 763         if (!pref_index)
 764                 epp = cpu_data->epp_default;
 765
 766         if (boot_cpu_has(X86_FEATURE_HWP_EPP)) {
 767                 if (use_raw)
 768                         epp = raw_epp;
 769                 else if (epp == -EINVAL)
 770                         epp = epp_values[pref_index];
 771
 772                 /*
 773                  * To avoid confusion, refuse to set EPP to any values different
 774                  * from 0 (performance) if the current policy is "performance",
 775                  * because those values would be overridden.
 776                  */
 777                 if (epp > 0 && cpu_data->policy == CPUFREQ_POLICY_PERFORMANCE)
 778                         return -EBUSY;
 779
 780                 ret = intel_pstate_set_epp(cpu_data, epp);
 781         } else {
 782                 if (epp == -EINVAL)
 783                         epp = (pref_index - 1) << 2;
 784                 ret = intel_pstate_set_epb(cpu_data->cpu, epp);
 785         }
 786
 787         return ret;
 788 }
 789
 790 static ssize_t show_energy_performance_available_preferences(
 791                                 struct cpufreq_policy *policy, char *buf)
 792 {
 793         int i = 0;
 794         int ret = 0;
 795
 796         while (energy_perf_strings[i] != NULL)
 797                 ret += sprintf(&buf[ret], "%s ", energy_perf_strings[i++]);
 798
 799         ret += sprintf(&buf[ret], "\n");
 800
 801         return ret;
 802 }
 803
 804 cpufreq_freq_attr_ro(energy_performance_available_preferences);
 805
 806 static struct cpufreq_driver intel_pstate;
 807
 808 static ssize_t store_energy_performance_preference(
 809                 struct cpufreq_policy *policy, const char *buf, size_t count)
 810 {
 811         struct cpudata *cpu = all_cpu_data[policy->cpu];
 812         char str_preference[21];
 813         bool raw = false;
 814         ssize_t ret;
 815         u32 epp = 0;
 816
 817         ret = sscanf(buf, "%20s", str_preference);
 818         if (ret != 1)
 819                 return -EINVAL;
 820
 821         ret = match_string(energy_perf_strings, -1, str_preference);
 822         if (ret < 0) {
 823                 if (!boot_cpu_has(X86_FEATURE_HWP_EPP))
 824                         return ret;
 825
 826                 ret = kstrtouint(buf, 10, &epp);
 827                 if (ret)
 828                         return ret;
 829
 830                 if (epp > 255)
 831                         return -EINVAL;
 832
 833                 raw = true;
 834         }
 835
 836         /*
 837          * This function runs with the policy R/W semaphore held, which
 838          * guarantees that the driver pointer will not change while it is
 839          * running.
 840          */
 841         if (!intel_pstate_driver)
 842                 return -EAGAIN;
 843
 844         mutex_lock(&intel_pstate_limits_lock);
 845
 846         if (intel_pstate_driver == &intel_pstate) {
 847                 ret = intel_pstate_set_energy_pref_index(cpu, ret, raw, epp);
 848         } else {
 849                 /*
 850                  * In the passive mode the governor needs to be stopped on the
 851                  * target CPU before the EPP update and restarted after it,
 852                  * which is super-heavy-weight, so make sure it is worth doing
 853                  * upfront.
 854                  */
 855                 if (!raw)
 856                         epp = ret ? epp_values[ret] : cpu->epp_default;
 857
 858                 if (cpu->epp_cached != epp) {
 859                         int err;
 860
 861                         cpufreq_stop_governor(policy);
 862                         ret = intel_pstate_set_epp(cpu, epp);
 863                         err = cpufreq_start_governor(policy);
 864                         if (!ret)
 865                                 ret = err;
 866                 }
 867         }
 868
 869         mutex_unlock(&intel_pstate_limits_lock);
 870
 871         return ret ?: count;
 872 }
 873
 874 static ssize_t show_energy_performance_preference(
 875                                 struct cpufreq_policy *policy, char *buf)
 876 {
 877         struct cpudata *cpu_data = all_cpu_data[policy->cpu];
 878         int preference, raw_epp;
 879
 880         preference = intel_pstate_get_energy_pref_index(cpu_data, &raw_epp);
 881         if (preference < 0)
 882                 return preference;
 883
 884         if (raw_epp)
 885                 return  sprintf(buf, "%d\n", raw_epp);
 886         else
 887                 return  sprintf(buf, "%s\n", energy_perf_strings[preference]);
 888 }
 889
 890 cpufreq_freq_attr_rw(energy_performance_preference);
 891
 892 static ssize_t show_base_frequency(struct cpufreq_policy *policy, char *buf)
 893 {
 894         struct cpudata *cpu = all_cpu_data[policy->cpu];
 895         int ratio, freq;
 896
 897         ratio = intel_pstate_get_cppc_guaranteed(policy->cpu);
 898         if (ratio <= 0) {
 899                 u64 cap;
 900
 901                 rdmsrl_on_cpu(policy->cpu, MSR_HWP_CAPABILITIES, &cap);
 902                 ratio = HWP_GUARANTEED_PERF(cap);
 903         }
 904
 905         freq = ratio * cpu->pstate.scaling;
 906         if (cpu->pstate.scaling != cpu->pstate.perf_ctl_scaling)
 907                 freq = rounddown(freq, cpu->pstate.perf_ctl_scaling);
 908
 909         return sprintf(buf, "%d\n", freq);
 910 }
 911
 912 cpufreq_freq_attr_ro(base_frequency);
 913
 914 static struct freq_attr *hwp_cpufreq_attrs[] = {
 915         &energy_performance_preference,
 916         &energy_performance_available_preferences,
 917         &base_frequency,
 918         NULL,
 919 };
 920
 921 static void __intel_pstate_get_hwp_cap(struct cpudata *cpu)
 922 {
 923         u64 cap;
 924
 925         rdmsrl_on_cpu(cpu->cpu, MSR_HWP_CAPABILITIES, &cap);
 926         WRITE_ONCE(cpu->hwp_cap_cached, cap);
 927         cpu->pstate.max_pstate = HWP_GUARANTEED_PERF(cap);
 928         cpu->pstate.turbo_pstate = HWP_HIGHEST_PERF(cap);
 929 }
 930
 931 static void intel_pstate_get_hwp_cap(struct cpudata *cpu)
 932 {
 933         int scaling = cpu->pstate.scaling;
 934
 935         __intel_pstate_get_hwp_cap(cpu);
 936
 937         cpu->pstate.max_freq = cpu->pstate.max_pstate * scaling;
 938         cpu->pstate.turbo_freq = cpu->pstate.turbo_pstate * scaling;
 939         if (scaling != cpu->pstate.perf_ctl_scaling) {
 940                 int perf_ctl_scaling = cpu->pstate.perf_ctl_scaling;
 941
 942                 cpu->pstate.max_freq = rounddown(cpu->pstate.max_freq,
 943                                                  perf_ctl_scaling);
 944                 cpu->pstate.turbo_freq = rounddown(cpu->pstate.turbo_freq,
 945                                                    perf_ctl_scaling);
 946         }
 947 }
 948
 949 static void intel_pstate_hwp_set(unsigned int cpu)
 950 {
 951         struct cpudata *cpu_data = all_cpu_data[cpu];
 952         int max, min;
 953         u64 value;
 954         s16 epp;
 955
 956         max = cpu_data->max_perf_ratio;
 957         min = cpu_data->min_perf_ratio;
 958
 959         if (cpu_data->policy == CPUFREQ_POLICY_PERFORMANCE)
 960                 min = max;
 961
 962         rdmsrl_on_cpu(cpu, MSR_HWP_REQUEST, &value);
 963
 964         value &= ~HWP_MIN_PERF(~0L);
 965         value |= HWP_MIN_PERF(min);
 966
 967         value &= ~HWP_MAX_PERF(~0L);
 968         value |= HWP_MAX_PERF(max);
 969
 970         if (cpu_data->epp_policy == cpu_data->policy)
 971                 goto skip_epp;
 972
 973         cpu_data->epp_policy = cpu_data->policy;
 974
 975         if (cpu_data->policy == CPUFREQ_POLICY_PERFORMANCE) {
 976                 epp = intel_pstate_get_epp(cpu_data, value);
 977                 cpu_data->epp_powersave = epp;
 978                 /* If EPP read was failed, then don't try to write */
 979                 if (epp < 0)
 980                         goto skip_epp;
 981
 982                 epp = 0;
 983         } else {
 984                 /* skip setting EPP, when saved value is invalid */
 985                 if (cpu_data->epp_powersave < 0)
 986                         goto skip_epp;
 987
 988                 /*
 989                  * No need to restore EPP when it is not zero. This
 990                  * means:
 991                  *  - Policy is not changed
 992                  *  - user has manually changed
 993                  *  - Error reading EPB
 994                  */
 995                 epp = intel_pstate_get_epp(cpu_data, value);
 996                 if (epp)
 997                         goto skip_epp;
 998
 999                 epp = cpu_data->epp_powersave;
1000         }
1001         if (boot_cpu_has(X86_FEATURE_HWP_EPP)) {
1002                 value &= ~GENMASK_ULL(31, 24);
1003                 value |= (u64)epp << 24;
1004         } else {
1005                 intel_pstate_set_epb(cpu, epp);
1006         }
1007 skip_epp:
1008         WRITE_ONCE(cpu_data->hwp_req_cached, value);
1009         wrmsrl_on_cpu(cpu, MSR_HWP_REQUEST, value);
1010 }
1011
1012 static void intel_pstate_disable_hwp_interrupt(struct cpudata *cpudata);
1013
1014 static void intel_pstate_hwp_offline(struct cpudata *cpu)
1015 {
1016         u64 value = READ_ONCE(cpu->hwp_req_cached);
1017         int min_perf;
1018
1019         intel_pstate_disable_hwp_interrupt(cpu);
1020
1021         if (boot_cpu_has(X86_FEATURE_HWP_EPP)) {
1022                 /*
1023                  * In case the EPP has been set to "performance" by the
1024                  * active mode "performance" scaling algorithm, replace that
1025                  * temporary value with the cached EPP one.
1026                  */
1027                 value &= ~GENMASK_ULL(31, 24);
1028                 value |= HWP_ENERGY_PERF_PREFERENCE(cpu->epp_cached);
1029                 /*
1030                  * However, make sure that EPP will be set to "performance" when
1031                  * the CPU is brought back online again and the "performance"
1032                  * scaling algorithm is still in effect.
1033                  */
1034                 cpu->epp_policy = CPUFREQ_POLICY_UNKNOWN;
1035         }
1036
1037         /*
1038          * Clear the desired perf field in the cached HWP request value to
1039          * prevent nonzero desired values from being leaked into the active
1040          * mode.
1041          */
1042         value &= ~HWP_DESIRED_PERF(~0L);
1043         WRITE_ONCE(cpu->hwp_req_cached, value);
1044
1045         value &= ~GENMASK_ULL(31, 0);
1046         min_perf = HWP_LOWEST_PERF(READ_ONCE(cpu->hwp_cap_cached));
1047
1048         /* Set hwp_max = hwp_min */
1049         value |= HWP_MAX_PERF(min_perf);
1050         value |= HWP_MIN_PERF(min_perf);
1051
1052         /* Set EPP to min */
1053         if (boot_cpu_has(X86_FEATURE_HWP_EPP))
1054                 value |= HWP_ENERGY_PERF_PREFERENCE(HWP_EPP_POWERSAVE);
1055
1056         wrmsrl_on_cpu(cpu->cpu, MSR_HWP_REQUEST, value);
1057 }
1058
1059 #define POWER_CTL_EE_ENABLE     1
1060 #define POWER_CTL_EE_DISABLE    2
1061
1062 static int power_ctl_ee_state;
1063
1064 static void set_power_ctl_ee_state(bool input)
1065 {
1066         u64 power_ctl;
1067
1068         mutex_lock(&intel_pstate_driver_lock);
1069         rdmsrl(MSR_IA32_POWER_CTL, power_ctl);
1070         if (input) {
1071                 power_ctl &= ~BIT(MSR_IA32_POWER_CTL_BIT_EE);
1072                 power_ctl_ee_state = POWER_CTL_EE_ENABLE;
1073         } else {
1074                 power_ctl |= BIT(MSR_IA32_POWER_CTL_BIT_EE);
1075                 power_ctl_ee_state = POWER_CTL_EE_DISABLE;
1076         }
1077         wrmsrl(MSR_IA32_POWER_CTL, power_ctl);
1078         mutex_unlock(&intel_pstate_driver_lock);
1079 }
1080
1081 static void intel_pstate_hwp_enable(struct cpudata *cpudata);
1082
1083 static void intel_pstate_hwp_reenable(struct cpudata *cpu)
1084 {
1085         intel_pstate_hwp_enable(cpu);
1086         wrmsrl_on_cpu(cpu->cpu, MSR_HWP_REQUEST, READ_ONCE(cpu->hwp_req_cached));
1087 }
1088
1089 static int intel_pstate_suspend(struct cpufreq_policy *policy)
1090 {
1091         struct cpudata *cpu = all_cpu_data[policy->cpu];
1092
1093         pr_debug("CPU %d suspending\n", cpu->cpu);
1094
1095         cpu->suspended = true;
1096
1097         /* disable HWP interrupt and cancel any pending work */
1098         intel_pstate_disable_hwp_interrupt(cpu);
1099
1100         return 0;
1101 }
1102
1103 static int intel_pstate_resume(struct cpufreq_policy *policy)
1104 {
1105         struct cpudata *cpu = all_cpu_data[policy->cpu];
1106
1107         pr_debug("CPU %d resuming\n", cpu->cpu);
1108
1109         /* Only restore if the system default is changed */
1110         if (power_ctl_ee_state == POWER_CTL_EE_ENABLE)
1111                 set_power_ctl_ee_state(true);
1112         else if (power_ctl_ee_state == POWER_CTL_EE_DISABLE)
1113                 set_power_ctl_ee_state(false);
1114
1115         if (cpu->suspended && hwp_active) {
1116                 mutex_lock(&intel_pstate_limits_lock);
1117
1118                 /* Re-enable HWP, because "online" has not done that. */
1119                 intel_pstate_hwp_reenable(cpu);
1120
1121                 mutex_unlock(&intel_pstate_limits_lock);
1122         }
1123
1124         cpu->suspended = false;
1125
1126         return 0;
1127 }
1128
1129 static void intel_pstate_update_policies(void)
1130 {
1131         int cpu;
1132
1133         for_each_possible_cpu(cpu)
1134                 cpufreq_update_policy(cpu);
1135 }
1136
1137 static void __intel_pstate_update_max_freq(struct cpudata *cpudata,
1138                                            struct cpufreq_policy *policy)
1139 {
1140         policy->cpuinfo.max_freq = global.turbo_disabled_mf ?
1141                         cpudata->pstate.max_freq : cpudata->pstate.turbo_freq;
1142         refresh_frequency_limits(policy);
1143 }
1144
1145 static void intel_pstate_update_max_freq(unsigned int cpu)
1146 {
1147         struct cpufreq_policy *policy = cpufreq_cpu_acquire(cpu);
1148
1149         if (!policy)
1150                 return;
1151
1152         __intel_pstate_update_max_freq(all_cpu_data[cpu], policy);
1153
1154         cpufreq_cpu_release(policy);
1155 }
1156
1157 static void intel_pstate_update_limits(unsigned int cpu)
1158 {
1159         mutex_lock(&intel_pstate_driver_lock);
1160
1161         update_turbo_state();
1162         /*
1163          * If turbo has been turned on or off globally, policy limits for
1164          * all CPUs need to be updated to reflect that.
1165          */
1166         if (global.turbo_disabled_mf != global.turbo_disabled) {
1167                 global.turbo_disabled_mf = global.turbo_disabled;
1168                 arch_set_max_freq_ratio(global.turbo_disabled);
1169                 for_each_possible_cpu(cpu)
1170                         intel_pstate_update_max_freq(cpu);
1171         } else {
1172                 cpufreq_update_policy(cpu);
1173         }
1174
1175         mutex_unlock(&intel_pstate_driver_lock);
1176 }
1177
1178 /************************** sysfs begin ************************/
1179 #define show_one(file_name, object)                                     \
1180         static ssize_t show_##file_name                                 \
1181         (struct kobject *kobj, struct kobj_attribute *attr, char *buf)  \
1182         {                                                               \
1183                 return sprintf(buf, "%u\n", global.object);             \
1184         }
1185
1186 static ssize_t intel_pstate_show_status(char *buf);
1187 static int intel_pstate_update_status(const char *buf, size_t size);
1188
1189 static ssize_t show_status(struct kobject *kobj,
1190                            struct kobj_attribute *attr, char *buf)
1191 {
1192         ssize_t ret;
1193
1194         mutex_lock(&intel_pstate_driver_lock);
1195         ret = intel_pstate_show_status(buf);
1196         mutex_unlock(&intel_pstate_driver_lock);
1197
1198         return ret;
1199 }
1200
1201 static ssize_t store_status(struct kobject *a, struct kobj_attribute *b,
1202                             const char *buf, size_t count)
1203 {
1204         char *p = memchr(buf, '\n', count);
1205         int ret;
1206
1207         mutex_lock(&intel_pstate_driver_lock);
1208         ret = intel_pstate_update_status(buf, p ? p - buf : count);
1209         mutex_unlock(&intel_pstate_driver_lock);
1210
1211         return ret < 0 ? ret : count;
1212 }
1213
1214 static ssize_t show_turbo_pct(struct kobject *kobj,
1215                                 struct kobj_attribute *attr, char *buf)
1216 {
1217         struct cpudata *cpu;
1218         int total, no_turbo, turbo_pct;
1219         uint32_t turbo_fp;
1220
1221         mutex_lock(&intel_pstate_driver_lock);
1222
1223         if (!intel_pstate_driver) {
1224                 mutex_unlock(&intel_pstate_driver_lock);
1225                 return -EAGAIN;
1226         }
1227
1228         cpu = all_cpu_data[0];
1229
1230         total = cpu->pstate.turbo_pstate - cpu->pstate.min_pstate + 1;
1231         no_turbo = cpu->pstate.max_pstate - cpu->pstate.min_pstate + 1;
1232         turbo_fp = div_fp(no_turbo, total);
1233         turbo_pct = 100 - fp_toint(mul_fp(turbo_fp, int_tofp(100)));
1234
1235         mutex_unlock(&intel_pstate_driver_lock);
1236
1237         return sprintf(buf, "%u\n", turbo_pct);
1238 }
1239
1240 static ssize_t show_num_pstates(struct kobject *kobj,
1241                                 struct kobj_attribute *attr, char *buf)
1242 {
1243         struct cpudata *cpu;
1244         int total;
1245
1246         mutex_lock(&intel_pstate_driver_lock);
1247
1248         if (!intel_pstate_driver) {
1249                 mutex_unlock(&intel_pstate_driver_lock);
1250                 return -EAGAIN;
1251         }
1252
1253         cpu = all_cpu_data[0];
1254         total = cpu->pstate.turbo_pstate - cpu->pstate.min_pstate + 1;
1255
1256         mutex_unlock(&intel_pstate_driver_lock);
1257
1258         return sprintf(buf, "%u\n", total);
1259 }
1260
1261 static ssize_t show_no_turbo(struct kobject *kobj,
1262                              struct kobj_attribute *attr, char *buf)
1263 {
1264         ssize_t ret;
1265
1266         mutex_lock(&intel_pstate_driver_lock);
1267
1268         if (!intel_pstate_driver) {
1269                 mutex_unlock(&intel_pstate_driver_lock);
1270                 return -EAGAIN;
1271         }
1272
1273         update_turbo_state();
1274         if (global.turbo_disabled)
1275                 ret = sprintf(buf, "%u\n", global.turbo_disabled);
1276         else
1277                 ret = sprintf(buf, "%u\n", global.no_turbo);
1278
1279         mutex_unlock(&intel_pstate_driver_lock);
1280
1281         return ret;
1282 }
1283
1284 static ssize_t store_no_turbo(struct kobject *a, struct kobj_attribute *b,
1285                               const char *buf, size_t count)
1286 {
1287         unsigned int input;
1288         int ret;
1289
1290         ret = sscanf(buf, "%u", &input);
1291         if (ret != 1)
1292                 return -EINVAL;
1293
1294         mutex_lock(&intel_pstate_driver_lock);
1295
1296         if (!intel_pstate_driver) {
1297                 mutex_unlock(&intel_pstate_driver_lock);
1298                 return -EAGAIN;
1299         }
1300
1301         mutex_lock(&intel_pstate_limits_lock);
1302
1303         update_turbo_state();
1304         if (global.turbo_disabled) {
1305                 pr_notice_once("Turbo disabled by BIOS or unavailable on processor\n");
1306                 mutex_unlock(&intel_pstate_limits_lock);
1307                 mutex_unlock(&intel_pstate_driver_lock);
1308                 return -EPERM;
1309         }
1310
1311         global.no_turbo = clamp_t(int, input, 0, 1);
1312
1313         if (global.no_turbo) {
1314                 struct cpudata *cpu = all_cpu_data[0];
1315                 int pct = cpu->pstate.max_pstate * 100 / cpu->pstate.turbo_pstate;
1316
1317                 /* Squash the global minimum into the permitted range. */
1318                 if (global.min_perf_pct > pct)
1319                         global.min_perf_pct = pct;
1320         }
1321
1322         mutex_unlock(&intel_pstate_limits_lock);
1323
1324         intel_pstate_update_policies();
1325         arch_set_max_freq_ratio(global.no_turbo);
1326
1327         mutex_unlock(&intel_pstate_driver_lock);
1328
1329         return count;
1330 }
1331
1332 static void update_qos_request(enum freq_qos_req_type type)
1333 {
1334         struct freq_qos_request *req;
1335         struct cpufreq_policy *policy;
1336         int i;
1337
1338         for_each_possible_cpu(i) {
1339                 struct cpudata *cpu = all_cpu_data[i];
1340                 unsigned int freq, perf_pct;
1341
1342                 policy = cpufreq_cpu_get(i);
1343                 if (!policy)
1344                         continue;
1345
1346                 req = policy->driver_data;
1347                 cpufreq_cpu_put(policy);
1348
1349                 if (!req)
1350                         continue;
1351
1352                 if (hwp_active)
1353                         intel_pstate_get_hwp_cap(cpu);
1354
1355                 if (type == FREQ_QOS_MIN) {
1356                         perf_pct = global.min_perf_pct;
1357                 } else {
1358                         req++;
1359                         perf_pct = global.max_perf_pct;
1360                 }
1361
1362                 freq = DIV_ROUND_UP(cpu->pstate.turbo_freq * perf_pct, 100);
1363
1364                 if (freq_qos_update_request(req, freq) < 0)
1365                         pr_warn("Failed to update freq constraint: CPU%d\n", i);
1366         }
1367 }
1368
1369 static ssize_t store_max_perf_pct(struct kobject *a, struct kobj_attribute *b,
1370                                   const char *buf, size_t count)
1371 {
1372         unsigned int input;
1373         int ret;
1374
1375         ret = sscanf(buf, "%u", &input);
1376         if (ret != 1)
1377                 return -EINVAL;
1378
1379         mutex_lock(&intel_pstate_driver_lock);
1380
1381         if (!intel_pstate_driver) {
1382                 mutex_unlock(&intel_pstate_driver_lock);
1383                 return -EAGAIN;
1384         }
1385
1386         mutex_lock(&intel_pstate_limits_lock);
1387
1388         global.max_perf_pct = clamp_t(int, input, global.min_perf_pct, 100);
1389
1390         mutex_unlock(&intel_pstate_limits_lock);
1391
1392         if (intel_pstate_driver == &intel_pstate)
1393                 intel_pstate_update_policies();
1394         else
1395                 update_qos_request(FREQ_QOS_MAX);
1396
1397         mutex_unlock(&intel_pstate_driver_lock);
1398
1399         return count;
1400 }
1401
1402 static ssize_t store_min_perf_pct(struct kobject *a, struct kobj_attribute *b,
1403                                   const char *buf, size_t count)
1404 {
1405         unsigned int input;
1406         int ret;
1407
1408         ret = sscanf(buf, "%u", &input);
1409         if (ret != 1)
1410                 return -EINVAL;
1411
1412         mutex_lock(&intel_pstate_driver_lock);
1413
1414         if (!intel_pstate_driver) {
1415                 mutex_unlock(&intel_pstate_driver_lock);
1416                 return -EAGAIN;
1417         }
1418
1419         mutex_lock(&intel_pstate_limits_lock);
1420
1421         global.min_perf_pct = clamp_t(int, input,
1422                                       min_perf_pct_min(), global.max_perf_pct);
1423
1424         mutex_unlock(&intel_pstate_limits_lock);
1425
1426         if (intel_pstate_driver == &intel_pstate)
1427                 intel_pstate_update_policies();
1428         else
1429                 update_qos_request(FREQ_QOS_MIN);
1430
1431         mutex_unlock(&intel_pstate_driver_lock);
1432
1433         return count;
1434 }
1435
1436 static ssize_t show_hwp_dynamic_boost(struct kobject *kobj,
1437                                 struct kobj_attribute *attr, char *buf)
1438 {
1439         return sprintf(buf, "%u\n", hwp_boost);
1440 }
1441
1442 static ssize_t store_hwp_dynamic_boost(struct kobject *a,
1443                                        struct kobj_attribute *b,
1444                                        const char *buf, size_t count)
1445 {
1446         unsigned int input;
1447         int ret;
1448
1449         ret = kstrtouint(buf, 10, &input);
1450         if (ret)
1451                 return ret;
1452
1453         mutex_lock(&intel_pstate_driver_lock);
1454         hwp_boost = !!input;
1455         intel_pstate_update_policies();
1456         mutex_unlock(&intel_pstate_driver_lock);
1457
1458         return count;
1459 }
1460
1461 static ssize_t show_energy_efficiency(struct kobject *kobj, struct kobj_attribute *attr,
1462                                       char *buf)
1463 {
1464         u64 power_ctl;
1465         int enable;
1466
1467         rdmsrl(MSR_IA32_POWER_CTL, power_ctl);
1468         enable = !!(power_ctl & BIT(MSR_IA32_POWER_CTL_BIT_EE));
1469         return sprintf(buf, "%d\n", !enable);
1470 }
1471
1472 static ssize_t store_energy_efficiency(struct kobject *a, struct kobj_attribute *b,
1473                                        const char *buf, size_t count)
1474 {
1475         bool input;
1476         int ret;
1477
1478         ret = kstrtobool(buf, &input);
1479         if (ret)
1480                 return ret;
1481
1482         set_power_ctl_ee_state(input);
1483
1484         return count;
1485 }
1486
1487 show_one(max_perf_pct, max_perf_pct);
1488 show_one(min_perf_pct, min_perf_pct);
1489
1490 define_one_global_rw(status);
1491 define_one_global_rw(no_turbo);
1492 define_one_global_rw(max_perf_pct);
1493 define_one_global_rw(min_perf_pct);
1494 define_one_global_ro(turbo_pct);
1495 define_one_global_ro(num_pstates);
1496 define_one_global_rw(hwp_dynamic_boost);
1497 define_one_global_rw(energy_efficiency);
1498
1499 static struct attribute *intel_pstate_attributes[] = {
1500         &status.attr,
1501         &no_turbo.attr,
1502         NULL
1503 };
1504
1505 static const struct attribute_group intel_pstate_attr_group = {
1506         .attrs = intel_pstate_attributes,
1507 };
1508
1509 static const struct x86_cpu_id intel_pstate_cpu_ee_disable_ids[];
1510
1511 static struct kobject *intel_pstate_kobject;
1512
1513 static void __init intel_pstate_sysfs_expose_params(void)
1514 {
1515         int rc;
1516
1517         intel_pstate_kobject = kobject_create_and_add("intel_pstate",
1518                                                 &cpu_subsys.dev_root->kobj);
1519         if (WARN_ON(!intel_pstate_kobject))
1520                 return;
1521
1522         rc = sysfs_create_group(intel_pstate_kobject, &intel_pstate_attr_group);
1523         if (WARN_ON(rc))
1524                 return;
1525
1526         if (!boot_cpu_has(X86_FEATURE_HYBRID_CPU)) {
1527                 rc = sysfs_create_file(intel_pstate_kobject, &turbo_pct.attr);
1528                 WARN_ON(rc);
1529
1530                 rc = sysfs_create_file(intel_pstate_kobject, &num_pstates.attr);
1531                 WARN_ON(rc);
1532         }
1533
1534         /*
1535          * If per cpu limits are enforced there are no global limits, so
1536          * return without creating max/min_perf_pct attributes
1537          */
1538         if (per_cpu_limits)
1539                 return;
1540
1541         rc = sysfs_create_file(intel_pstate_kobject, &max_perf_pct.attr);
1542         WARN_ON(rc);
1543
1544         rc = sysfs_create_file(intel_pstate_kobject, &min_perf_pct.attr);
1545         WARN_ON(rc);
1546
1547         if (x86_match_cpu(intel_pstate_cpu_ee_disable_ids)) {
1548                 rc = sysfs_create_file(intel_pstate_kobject, &energy_efficiency.attr);
1549                 WARN_ON(rc);
1550         }
1551 }
1552
1553 static void __init intel_pstate_sysfs_remove(void)
1554 {
1555         if (!intel_pstate_kobject)
1556                 return;
1557
1558         sysfs_remove_group(intel_pstate_kobject, &intel_pstate_attr_group);
1559
1560         if (!boot_cpu_has(X86_FEATURE_HYBRID_CPU)) {
1561                 sysfs_remove_file(intel_pstate_kobject, &num_pstates.attr);
1562                 sysfs_remove_file(intel_pstate_kobject, &turbo_pct.attr);
1563         }
1564
1565         if (!per_cpu_limits) {
1566                 sysfs_remove_file(intel_pstate_kobject, &max_perf_pct.attr);
1567                 sysfs_remove_file(intel_pstate_kobject, &min_perf_pct.attr);
1568
1569                 if (x86_match_cpu(intel_pstate_cpu_ee_disable_ids))
1570                         sysfs_remove_file(intel_pstate_kobject, &energy_efficiency.attr);
1571         }
1572
1573         kobject_put(intel_pstate_kobject);
1574 }
1575
1576 static void intel_pstate_sysfs_expose_hwp_dynamic_boost(void)
1577 {
1578         int rc;
1579
1580         if (!hwp_active)
1581                 return;
1582
1583         rc = sysfs_create_file(intel_pstate_kobject, &hwp_dynamic_boost.attr);
1584         WARN_ON_ONCE(rc);
1585 }
1586
1587 static void intel_pstate_sysfs_hide_hwp_dynamic_boost(void)
1588 {
1589         if (!hwp_active)
1590                 return;
1591
1592         sysfs_remove_file(intel_pstate_kobject, &hwp_dynamic_boost.attr);
1593 }
1594
1595 /************************** sysfs end ************************/
1596
1597 static void intel_pstate_notify_work(struct work_struct *work)
1598 {
1599         struct cpudata *cpudata =
1600                 container_of(to_delayed_work(work), struct cpudata, hwp_notify_work);
1601         struct cpufreq_policy *policy = cpufreq_cpu_acquire(cpudata->cpu);
1602
1603         if (policy) {
1604                 intel_pstate_get_hwp_cap(cpudata);
1605                 __intel_pstate_update_max_freq(cpudata, policy);
1606
1607                 cpufreq_cpu_release(policy);
1608         }
1609
1610         wrmsrl_on_cpu(cpudata->cpu, MSR_HWP_STATUS, 0);
1611 }
1612
1613 static DEFINE_SPINLOCK(hwp_notify_lock);
1614 static cpumask_t hwp_intr_enable_mask;
1615
1616 void notify_hwp_interrupt(void)
1617 {
1618         unsigned int this_cpu = smp_processor_id();
1619         struct cpudata *cpudata;
1620         unsigned long flags;
1621         u64 value;
1622
1623         if (!READ_ONCE(hwp_active) || !boot_cpu_has(X86_FEATURE_HWP_NOTIFY))
1624                 return;
1625
1626         rdmsrl_safe(MSR_HWP_STATUS, &value);
1627         if (!(value & 0x01))
1628                 return;
1629
1630         spin_lock_irqsave(&hwp_notify_lock, flags);
1631
1632         if (!cpumask_test_cpu(this_cpu, &hwp_intr_enable_mask))
1633                 goto ack_intr;
1634
1635         /*
1636          * Currently we never free all_cpu_data. And we can't reach here
1637          * without this allocated. But for safety for future changes, added
1638          * check.
1639          */
1640         if (unlikely(!READ_ONCE(all_cpu_data)))
1641                 goto ack_intr;
1642
1643         /*
1644          * The free is done during cleanup, when cpufreq registry is failed.
1645          * We wouldn't be here if it fails on init or switch status. But for
1646          * future changes, added check.
1647          */
1648         cpudata = READ_ONCE(all_cpu_data[this_cpu]);
1649         if (unlikely(!cpudata))
1650                 goto ack_intr;
1651
1652         schedule_delayed_work(&cpudata->hwp_notify_work, msecs_to_jiffies(10));
1653
1654         spin_unlock_irqrestore(&hwp_notify_lock, flags);
1655
1656         return;
1657
1658 ack_intr:
1659         wrmsrl_safe(MSR_HWP_STATUS, 0);
1660         spin_unlock_irqrestore(&hwp_notify_lock, flags);
1661 }
1662
1663 static void intel_pstate_disable_hwp_interrupt(struct cpudata *cpudata)
1664 {
1665         unsigned long flags;
1666
1667         if (!boot_cpu_has(X86_FEATURE_HWP_NOTIFY))
1668                 return;
1669
1670         /* wrmsrl_on_cpu has to be outside spinlock as this can result in IPC */
1671         wrmsrl_on_cpu(cpudata->cpu, MSR_HWP_INTERRUPT, 0x00);
1672
1673         spin_lock_irqsave(&hwp_notify_lock, flags);
1674         if (cpumask_test_and_clear_cpu(cpudata->cpu, &hwp_intr_enable_mask))
1675                 cancel_delayed_work(&cpudata->hwp_notify_work);
1676         spin_unlock_irqrestore(&hwp_notify_lock, flags);
1677 }
1678
1679 static void intel_pstate_enable_hwp_interrupt(struct cpudata *cpudata)
1680 {
1681         /* Enable HWP notification interrupt for guaranteed performance change */
1682         if (boot_cpu_has(X86_FEATURE_HWP_NOTIFY)) {
1683                 unsigned long flags;
1684
1685                 spin_lock_irqsave(&hwp_notify_lock, flags);
1686                 INIT_DELAYED_WORK(&cpudata->hwp_notify_work, intel_pstate_notify_work);
1687                 cpumask_set_cpu(cpudata->cpu, &hwp_intr_enable_mask);
1688                 spin_unlock_irqrestore(&hwp_notify_lock, flags);
1689
1690                 /* wrmsrl_on_cpu has to be outside spinlock as this can result in IPC */
1691                 wrmsrl_on_cpu(cpudata->cpu, MSR_HWP_INTERRUPT, 0x01);
1692                 wrmsrl_on_cpu(cpudata->cpu, MSR_HWP_STATUS, 0);
1693         }
1694 }
1695
1696 static void intel_pstate_update_epp_defaults(struct cpudata *cpudata)
1697 {
1698         cpudata->epp_default = intel_pstate_get_epp(cpudata, 0);
1699
1700         /*
1701          * If this CPU gen doesn't call for change in balance_perf
1702          * EPP return.
1703          */
1704         if (epp_values[EPP_INDEX_BALANCE_PERFORMANCE] == HWP_EPP_BALANCE_PERFORMANCE)
1705                 return;
1706
1707         /*
1708          * If powerup EPP is something other than chipset default 0x80 and
1709          * - is more performance oriented than 0x80 (default balance_perf EPP)
1710          * - But less performance oriented than performance EPP
1711          *   then use this as new balance_perf EPP.
1712          */
1713         if (cpudata->epp_default < HWP_EPP_BALANCE_PERFORMANCE &&
1714             cpudata->epp_default > HWP_EPP_PERFORMANCE) {
1715                 epp_values[EPP_INDEX_BALANCE_PERFORMANCE] = cpudata->epp_default;
1716                 return;
1717         }
1718
1719         /*
1720          * Use hard coded value per gen to update the balance_perf
1721          * and default EPP.
1722          */
1723         cpudata->epp_default = epp_values[EPP_INDEX_BALANCE_PERFORMANCE];
1724         intel_pstate_set_epp(cpudata, cpudata->epp_default);
1725 }
1726
1727 static void intel_pstate_hwp_enable(struct cpudata *cpudata)
1728 {
1729         /* First disable HWP notification interrupt till we activate again */
1730         if (boot_cpu_has(X86_FEATURE_HWP_NOTIFY))
1731                 wrmsrl_on_cpu(cpudata->cpu, MSR_HWP_INTERRUPT, 0x00);
1732
1733         wrmsrl_on_cpu(cpudata->cpu, MSR_PM_ENABLE, 0x1);
1734
1735         intel_pstate_enable_hwp_interrupt(cpudata);
1736
1737         if (cpudata->epp_default >= 0)
1738                 return;
1739
1740         intel_pstate_update_epp_defaults(cpudata);
1741 }
1742
1743 static int atom_get_min_pstate(void)
1744 {
1745         u64 value;
1746
1747         rdmsrl(MSR_ATOM_CORE_RATIOS, value);
1748         return (value >> 8) & 0x7F;
1749 }
1750
1751 static int atom_get_max_pstate(void)
1752 {
1753         u64 value;
1754
1755         rdmsrl(MSR_ATOM_CORE_RATIOS, value);
1756         return (value >> 16) & 0x7F;
1757 }
1758
1759 static int atom_get_turbo_pstate(void)
1760 {
1761         u64 value;
1762
1763         rdmsrl(MSR_ATOM_CORE_TURBO_RATIOS, value);
1764         return value & 0x7F;
1765 }
1766
1767 static u64 atom_get_val(struct cpudata *cpudata, int pstate)
1768 {
1769         u64 val;
1770         int32_t vid_fp;
1771         u32 vid;
1772
1773         val = (u64)pstate << 8;
1774         if (global.no_turbo && !global.turbo_disabled)
1775                 val |= (u64)1 << 32;
1776
1777         vid_fp = cpudata->vid.min + mul_fp(
1778                 int_tofp(pstate - cpudata->pstate.min_pstate),
1779                 cpudata->vid.ratio);
1780
1781         vid_fp = clamp_t(int32_t, vid_fp, cpudata->vid.min, cpudata->vid.max);
1782         vid = ceiling_fp(vid_fp);
1783
1784         if (pstate > cpudata->pstate.max_pstate)
1785                 vid = cpudata->vid.turbo;
1786
1787         return val | vid;
1788 }
1789
1790 static int silvermont_get_scaling(void)
1791 {
1792         u64 value;
1793         int i;
1794         /* Defined in Table 35-6 from SDM (Sept 2015) */
1795         static int silvermont_freq_table[] = {
1796                 83300, 100000, 133300, 116700, 80000};
1797
1798         rdmsrl(MSR_FSB_FREQ, value);
1799         i = value & 0x7;
1800         WARN_ON(i > 4);
1801
1802         return silvermont_freq_table[i];
1803 }
1804
1805 static int airmont_get_scaling(void)
1806 {
1807         u64 value;
1808         int i;
1809         /* Defined in Table 35-10 from SDM (Sept 2015) */
1810         static int airmont_freq_table[] = {
1811                 83300, 100000, 133300, 116700, 80000,
1812                 93300, 90000, 88900, 87500};
1813
1814         rdmsrl(MSR_FSB_FREQ, value);
1815         i = value & 0xF;
1816         WARN_ON(i > 8);
1817
1818         return airmont_freq_table[i];
1819 }
1820
1821 static void atom_get_vid(struct cpudata *cpudata)
1822 {
1823         u64 value;
1824
1825         rdmsrl(MSR_ATOM_CORE_VIDS, value);
1826         cpudata->vid.min = int_tofp((value >> 8) & 0x7f);
1827         cpudata->vid.max = int_tofp((value >> 16) & 0x7f);
1828         cpudata->vid.ratio = div_fp(
1829                 cpudata->vid.max - cpudata->vid.min,
1830                 int_tofp(cpudata->pstate.max_pstate -
1831                         cpudata->pstate.min_pstate));
1832
1833         rdmsrl(MSR_ATOM_CORE_TURBO_VIDS, value);
1834         cpudata->vid.turbo = value & 0x7f;
1835 }
1836
1837 static int core_get_min_pstate(void)
1838 {
1839         u64 value;
1840
1841         rdmsrl(MSR_PLATFORM_INFO, value);
1842         return (value >> 40) & 0xFF;
1843 }
1844
1845 static int core_get_max_pstate_physical(void)
1846 {
1847         u64 value;
1848
1849         rdmsrl(MSR_PLATFORM_INFO, value);
1850         return (value >> 8) & 0xFF;
1851 }
1852
1853 static int core_get_tdp_ratio(u64 plat_info)
1854 {
1855         /* Check how many TDP levels present */
1856         if (plat_info & 0x600000000) {
1857                 u64 tdp_ctrl;
1858                 u64 tdp_ratio;
1859                 int tdp_msr;
1860                 int err;
1861
1862                 /* Get the TDP level (0, 1, 2) to get ratios */
1863                 err = rdmsrl_safe(MSR_CONFIG_TDP_CONTROL, &tdp_ctrl);
1864                 if (err)
1865                         return err;
1866
1867                 /* TDP MSR are continuous starting at 0x648 */
1868                 tdp_msr = MSR_CONFIG_TDP_NOMINAL + (tdp_ctrl & 0x03);
1869                 err = rdmsrl_safe(tdp_msr, &tdp_ratio);
1870                 if (err)
1871                         return err;
1872
1873                 /* For level 1 and 2, bits[23:16] contain the ratio */
1874                 if (tdp_ctrl & 0x03)
1875                         tdp_ratio >>= 16;
1876
1877                 tdp_ratio &= 0xff; /* ratios are only 8 bits long */
1878                 pr_debug("tdp_ratio %x\n", (int)tdp_ratio);
1879
1880                 return (int)tdp_ratio;
1881         }
1882
1883         return -ENXIO;
1884 }
1885
1886 static int core_get_max_pstate(void)
1887 {
1888         u64 tar;
1889         u64 plat_info;
1890         int max_pstate;
1891         int tdp_ratio;
1892         int err;
1893
1894         rdmsrl(MSR_PLATFORM_INFO, plat_info);
1895         max_pstate = (plat_info >> 8) & 0xFF;
1896
1897         tdp_ratio = core_get_tdp_ratio(plat_info);
1898         if (tdp_ratio <= 0)
1899                 return max_pstate;
1900
1901         if (hwp_active) {
1902                 /* Turbo activation ratio is not used on HWP platforms */
1903                 return tdp_ratio;
1904         }
1905
1906         err = rdmsrl_safe(MSR_TURBO_ACTIVATION_RATIO, &tar);
1907         if (!err) {
1908                 int tar_levels;
1909
1910                 /* Do some sanity checking for safety */
1911                 tar_levels = tar & 0xff;
1912                 if (tdp_ratio - 1 == tar_levels) {
1913                         max_pstate = tar_levels;
1914                         pr_debug("max_pstate=TAC %x\n", max_pstate);
1915                 }
1916         }
1917
1918         return max_pstate;
1919 }
1920
1921 static int core_get_turbo_pstate(void)
1922 {
1923         u64 value;
1924         int nont, ret;
1925
1926         rdmsrl(MSR_TURBO_RATIO_LIMIT, value);
1927         nont = core_get_max_pstate();
1928         ret = (value) & 255;
1929         if (ret <= nont)
1930                 ret = nont;
1931         return ret;
1932 }
1933
1934 static inline int core_get_scaling(void)
1935 {
1936         return 100000;
1937 }
1938
1939 static u64 core_get_val(struct cpudata *cpudata, int pstate)
1940 {
1941         u64 val;
1942
1943         val = (u64)pstate << 8;
1944         if (global.no_turbo && !global.turbo_disabled)
1945                 val |= (u64)1 << 32;
1946
1947         return val;
1948 }
1949
1950 static int knl_get_aperf_mperf_shift(void)
1951 {
1952         return 10;
1953 }
1954
1955 static int knl_get_turbo_pstate(void)
1956 {
1957         u64 value;
1958         int nont, ret;
1959
1960         rdmsrl(MSR_TURBO_RATIO_LIMIT, value);
1961         nont = core_get_max_pstate();
1962         ret = (((value) >> 8) & 0xFF);
1963         if (ret <= nont)
1964                 ret = nont;
1965         return ret;
1966 }
1967
1968 #ifdef CONFIG_ACPI_CPPC_LIB
1969 static u32 hybrid_ref_perf;
1970
1971 static int hybrid_get_cpu_scaling(int cpu)
1972 {
1973         return DIV_ROUND_UP(core_get_scaling() * hybrid_ref_perf,
1974                             intel_pstate_cppc_nominal(cpu));
1975 }
1976
1977 static void intel_pstate_cppc_set_cpu_scaling(void)
1978 {
1979         u32 min_nominal_perf = U32_MAX;
1980         int cpu;
1981
1982         for_each_present_cpu(cpu) {
1983                 u32 nominal_perf = intel_pstate_cppc_nominal(cpu);
1984
1985                 if (nominal_perf && nominal_perf < min_nominal_perf)
1986                         min_nominal_perf = nominal_perf;
1987         }
1988
1989         if (min_nominal_perf < U32_MAX) {
1990                 hybrid_ref_perf = min_nominal_perf;
1991                 pstate_funcs.get_cpu_scaling = hybrid_get_cpu_scaling;
1992         }
1993 }
1994 #else
1995 static inline void intel_pstate_cppc_set_cpu_scaling(void)
1996 {
1997 }
1998 #endif /* CONFIG_ACPI_CPPC_LIB */
1999
2000 static void intel_pstate_set_pstate(struct cpudata *cpu, int pstate)
2001 {
2002         trace_cpu_frequency(pstate * cpu->pstate.scaling, cpu->cpu);
2003         cpu->pstate.current_pstate = pstate;
2004         /*
2005          * Generally, there is no guarantee that this code will always run on
2006          * the CPU being updated, so force the register update to run on the
2007          * right CPU.
2008          */
2009         wrmsrl_on_cpu(cpu->cpu, MSR_IA32_PERF_CTL,
2010                       pstate_funcs.get_val(cpu, pstate));
2011 }
2012
2013 static void intel_pstate_set_min_pstate(struct cpudata *cpu)
2014 {
2015         intel_pstate_set_pstate(cpu, cpu->pstate.min_pstate);
2016 }
2017
2018 static void intel_pstate_max_within_limits(struct cpudata *cpu)
2019 {
2020         int pstate = max(cpu->pstate.min_pstate, cpu->max_perf_ratio);
2021
2022         update_turbo_state();
2023         intel_pstate_set_pstate(cpu, pstate);
2024 }
2025
2026 static void intel_pstate_get_cpu_pstates(struct cpudata *cpu)
2027 {
2028         int perf_ctl_max_phys = pstate_funcs.get_max_physical();
2029         int perf_ctl_scaling = pstate_funcs.get_scaling();
2030
2031         cpu->pstate.min_pstate = pstate_funcs.get_min();
2032         cpu->pstate.max_pstate_physical = perf_ctl_max_phys;
2033         cpu->pstate.perf_ctl_scaling = perf_ctl_scaling;
2034
2035         if (hwp_active && !hwp_mode_bdw) {
2036                 __intel_pstate_get_hwp_cap(cpu);
2037
2038                 if (pstate_funcs.get_cpu_scaling) {
2039                         cpu->pstate.scaling = pstate_funcs.get_cpu_scaling(cpu->cpu);
2040                         if (cpu->pstate.scaling != perf_ctl_scaling)
2041                                 intel_pstate_hybrid_hwp_adjust(cpu);
2042                 } else {
2043                         cpu->pstate.scaling = perf_ctl_scaling;
2044                 }
2045         } else {
2046                 cpu->pstate.scaling = perf_ctl_scaling;
2047                 cpu->pstate.max_pstate = pstate_funcs.get_max();
2048                 cpu->pstate.turbo_pstate = pstate_funcs.get_turbo();
2049         }
2050
2051         if (cpu->pstate.scaling == perf_ctl_scaling) {
2052                 cpu->pstate.min_freq = cpu->pstate.min_pstate * perf_ctl_scaling;
2053                 cpu->pstate.max_freq = cpu->pstate.max_pstate * perf_ctl_scaling;
2054                 cpu->pstate.turbo_freq = cpu->pstate.turbo_pstate * perf_ctl_scaling;
2055         }
2056
2057         if (pstate_funcs.get_aperf_mperf_shift)
2058                 cpu->aperf_mperf_shift = pstate_funcs.get_aperf_mperf_shift();
2059
2060         if (pstate_funcs.get_vid)
2061                 pstate_funcs.get_vid(cpu);
2062
2063         intel_pstate_set_min_pstate(cpu);
2064 }
2065
2066 /*
2067  * Long hold time will keep high perf limits for long time,
2068  * which negatively impacts perf/watt for some workloads,
2069  * like specpower. 3ms is based on experiements on some
2070  * workoads.
2071  */
2072 static int hwp_boost_hold_time_ns = 3 * NSEC_PER_MSEC;
2073
2074 static inline void intel_pstate_hwp_boost_up(struct cpudata *cpu)
2075 {
2076         u64 hwp_req = READ_ONCE(cpu->hwp_req_cached);
2077         u64 hwp_cap = READ_ONCE(cpu->hwp_cap_cached);
2078         u32 max_limit = (hwp_req & 0xff00) >> 8;
2079         u32 min_limit = (hwp_req & 0xff);
2080         u32 boost_level1;
2081
2082         /*
2083          * Cases to consider (User changes via sysfs or boot time):
2084          * If, P0 (Turbo max) = P1 (Guaranteed max) = min:
2085          *      No boost, return.
2086          * If, P0 (Turbo max) > P1 (Guaranteed max) = min:
2087          *     Should result in one level boost only for P0.
2088          * If, P0 (Turbo max) = P1 (Guaranteed max) > min:
2089          *     Should result in two level boost:
2090          *         (min + p1)/2 and P1.
2091          * If, P0 (Turbo max) > P1 (Guaranteed max) > min:
2092          *     Should result in three level boost:
2093          *        (min + p1)/2, P1 and P0.
2094          */
2095
2096         /* If max and min are equal or already at max, nothing to boost */
2097         if (max_limit == min_limit || cpu->hwp_boost_min >= max_limit)
2098                 return;
2099
2100         if (!cpu->hwp_boost_min)
2101                 cpu->hwp_boost_min = min_limit;
2102
2103         /* level at half way mark between min and guranteed */
2104         boost_level1 = (HWP_GUARANTEED_PERF(hwp_cap) + min_limit) >> 1;
2105
2106         if (cpu->hwp_boost_min < boost_level1)
2107                 cpu->hwp_boost_min = boost_level1;
2108         else if (cpu->hwp_boost_min < HWP_GUARANTEED_PERF(hwp_cap))
2109                 cpu->hwp_boost_min = HWP_GUARANTEED_PERF(hwp_cap);
2110         else if (cpu->hwp_boost_min == HWP_GUARANTEED_PERF(hwp_cap) &&
2111                  max_limit != HWP_GUARANTEED_PERF(hwp_cap))
2112                 cpu->hwp_boost_min = max_limit;
2113         else
2114                 return;
2115
2116         hwp_req = (hwp_req & ~GENMASK_ULL(7, 0)) | cpu->hwp_boost_min;
2117         wrmsrl(MSR_HWP_REQUEST, hwp_req);
2118         cpu->last_update = cpu->sample.time;
2119 }
2120
2121 static inline void intel_pstate_hwp_boost_down(struct cpudata *cpu)
2122 {
2123         if (cpu->hwp_boost_min) {
2124                 bool expired;
2125
2126                 /* Check if we are idle for hold time to boost down */
2127                 expired = time_after64(cpu->sample.time, cpu->last_update +
2128                                        hwp_boost_hold_time_ns);
2129                 if (expired) {
2130                         wrmsrl(MSR_HWP_REQUEST, cpu->hwp_req_cached);
2131                         cpu->hwp_boost_min = 0;
2132                 }
2133         }
2134         cpu->last_update = cpu->sample.time;
2135 }
2136
2137 static inline void intel_pstate_update_util_hwp_local(struct cpudata *cpu,
2138                                                       u64 time)
2139 {
2140         cpu->sample.time = time;
2141
2142         if (cpu->sched_flags & SCHED_CPUFREQ_IOWAIT) {
2143                 bool do_io = false;
2144
2145                 cpu->sched_flags = 0;
2146                 /*
2147                  * Set iowait_boost flag and update time. Since IO WAIT flag
2148                  * is set all the time, we can't just conclude that there is
2149                  * some IO bound activity is scheduled on this CPU with just
2150                  * one occurrence. If we receive at least two in two
2151                  * consecutive ticks, then we treat as boost candidate.
2152                  */
2153                 if (time_before64(time, cpu->last_io_update + 2 * TICK_NSEC))
2154                         do_io = true;
2155
2156                 cpu->last_io_update = time;
2157
2158                 if (do_io)
2159                         intel_pstate_hwp_boost_up(cpu);
2160
2161         } else {
2162                 intel_pstate_hwp_boost_down(cpu);
2163         }
2164 }
2165
2166 static inline void intel_pstate_update_util_hwp(struct update_util_data *data,
2167                                                 u64 time, unsigned int flags)
2168 {
2169         struct cpudata *cpu = container_of(data, struct cpudata, update_util);
2170
2171         cpu->sched_flags |= flags;
2172
2173         if (smp_processor_id() == cpu->cpu)
2174                 intel_pstate_update_util_hwp_local(cpu, time);
2175 }
2176
2177 static inline void intel_pstate_calc_avg_perf(struct cpudata *cpu)
2178 {
2179         struct sample *sample = &cpu->sample;
2180
2181         sample->core_avg_perf = div_ext_fp(sample->aperf, sample->mperf);
2182 }
2183
2184 static inline bool intel_pstate_sample(struct cpudata *cpu, u64 time)
2185 {
2186         u64 aperf, mperf;
2187         unsigned long flags;
2188         u64 tsc;
2189
2190         local_irq_save(flags);
2191         rdmsrl(MSR_IA32_APERF, aperf);
2192         rdmsrl(MSR_IA32_MPERF, mperf);
2193         tsc = rdtsc();
2194         if (cpu->prev_mperf == mperf || cpu->prev_tsc == tsc) {
2195                 local_irq_restore(flags);
2196                 return false;
2197         }
2198         local_irq_restore(flags);
2199
2200         cpu->last_sample_time = cpu->sample.time;
2201         cpu->sample.time = time;
2202         cpu->sample.aperf = aperf;
2203         cpu->sample.mperf = mperf;
2204         cpu->sample.tsc =  tsc;
2205         cpu->sample.aperf -= cpu->prev_aperf;
2206         cpu->sample.mperf -= cpu->prev_mperf;
2207         cpu->sample.tsc -= cpu->prev_tsc;
2208
2209         cpu->prev_aperf = aperf;
2210         cpu->prev_mperf = mperf;
2211         cpu->prev_tsc = tsc;
2212         /*
2213          * First time this function is invoked in a given cycle, all of the
2214          * previous sample data fields are equal to zero or stale and they must
2215          * be populated with meaningful numbers for things to work, so assume
2216          * that sample.time will always be reset before setting the utilization
2217          * update hook and make the caller skip the sample then.
2218          */
2219         if (cpu->last_sample_time) {
2220                 intel_pstate_calc_avg_perf(cpu);
2221                 return true;
2222         }
2223         return false;
2224 }
2225
2226 static inline int32_t get_avg_frequency(struct cpudata *cpu)
2227 {
2228         return mul_ext_fp(cpu->sample.core_avg_perf, cpu_khz);
2229 }
2230
2231 static inline int32_t get_avg_pstate(struct cpudata *cpu)
2232 {
2233         return mul_ext_fp(cpu->pstate.max_pstate_physical,
2234                           cpu->sample.core_avg_perf);
2235 }
2236
2237 static inline int32_t get_target_pstate(struct cpudata *cpu)
2238 {
2239         struct sample *sample = &cpu->sample;
2240         int32_t busy_frac;
2241         int target, avg_pstate;
2242
2243         busy_frac = div_fp(sample->mperf << cpu->aperf_mperf_shift,
2244                            sample->tsc);
2245
2246         if (busy_frac < cpu->iowait_boost)
2247                 busy_frac = cpu->iowait_boost;
2248
2249         sample->busy_scaled = busy_frac * 100;
2250
2251         target = global.no_turbo || global.turbo_disabled ?
2252                         cpu->pstate.max_pstate : cpu->pstate.turbo_pstate;
2253         target += target >> 2;
2254         target = mul_fp(target, busy_frac);
2255         if (target < cpu->pstate.min_pstate)
2256                 target = cpu->pstate.min_pstate;
2257
2258         /*
2259          * If the average P-state during the previous cycle was higher than the
2260          * current target, add 50% of the difference to the target to reduce
2261          * possible performance oscillations and offset possible performance
2262          * loss related to moving the workload from one CPU to another within
2263          * a package/module.
2264          */
2265         avg_pstate = get_avg_pstate(cpu);
2266         if (avg_pstate > target)
2267                 target += (avg_pstate - target) >> 1;
2268
2269         return target;
2270 }
2271
2272 static int intel_pstate_prepare_request(struct cpudata *cpu, int pstate)
2273 {
2274         int min_pstate = max(cpu->pstate.min_pstate, cpu->min_perf_ratio);
2275         int max_pstate = max(min_pstate, cpu->max_perf_ratio);
2276
2277         return clamp_t(int, pstate, min_pstate, max_pstate);
2278 }
2279
2280 static void intel_pstate_update_pstate(struct cpudata *cpu, int pstate)
2281 {
2282         if (pstate == cpu->pstate.current_pstate)
2283                 return;
2284
2285         cpu->pstate.current_pstate = pstate;
2286         wrmsrl(MSR_IA32_PERF_CTL, pstate_funcs.get_val(cpu, pstate));
2287 }
2288
2289 static void intel_pstate_adjust_pstate(struct cpudata *cpu)
2290 {
2291         int from = cpu->pstate.current_pstate;
2292         struct sample *sample;
2293         int target_pstate;
2294
2295         update_turbo_state();
2296
2297         target_pstate = get_target_pstate(cpu);
2298         target_pstate = intel_pstate_prepare_request(cpu, target_pstate);
2299         trace_cpu_frequency(target_pstate * cpu->pstate.scaling, cpu->cpu);
2300         intel_pstate_update_pstate(cpu, target_pstate);
2301
2302         sample = &cpu->sample;
2303         trace_pstate_sample(mul_ext_fp(100, sample->core_avg_perf),
2304                 fp_toint(sample->busy_scaled),
2305                 from,
2306                 cpu->pstate.current_pstate,
2307                 sample->mperf,
2308                 sample->aperf,
2309                 sample->tsc,
2310                 get_avg_frequency(cpu),
2311                 fp_toint(cpu->iowait_boost * 100));
2312 }
2313
2314 static void intel_pstate_update_util(struct update_util_data *data, u64 time,
2315                                      unsigned int flags)
2316 {
2317         struct cpudata *cpu = container_of(data, struct cpudata, update_util);
2318         u64 delta_ns;
2319
2320         /* Don't allow remote callbacks */
2321         if (smp_processor_id() != cpu->cpu)
2322                 return;
2323
2324         delta_ns = time - cpu->last_update;
2325         if (flags & SCHED_CPUFREQ_IOWAIT) {
2326                 /* Start over if the CPU may have been idle. */
2327                 if (delta_ns > TICK_NSEC) {
2328                         cpu->iowait_boost = ONE_EIGHTH_FP;
2329                 } else if (cpu->iowait_boost >= ONE_EIGHTH_FP) {
2330                         cpu->iowait_boost <<= 1;
2331                         if (cpu->iowait_boost > int_tofp(1))
2332                                 cpu->iowait_boost = int_tofp(1);
2333                 } else {
2334                         cpu->iowait_boost = ONE_EIGHTH_FP;
2335                 }
2336         } else if (cpu->iowait_boost) {
2337                 /* Clear iowait_boost if the CPU may have been idle. */
2338                 if (delta_ns > TICK_NSEC)
2339                         cpu->iowait_boost = 0;
2340                 else
2341                         cpu->iowait_boost >>= 1;
2342         }
2343         cpu->last_update = time;
2344         delta_ns = time - cpu->sample.time;
2345         if ((s64)delta_ns < INTEL_PSTATE_SAMPLING_INTERVAL)
2346                 return;
2347
2348         if (intel_pstate_sample(cpu, time))
2349                 intel_pstate_adjust_pstate(cpu);
2350 }
2351
2352 static struct pstate_funcs core_funcs = {
2353         .get_max = core_get_max_pstate,
2354         .get_max_physical = core_get_max_pstate_physical,
2355         .get_min = core_get_min_pstate,
2356         .get_turbo = core_get_turbo_pstate,
2357         .get_scaling = core_get_scaling,
2358         .get_val = core_get_val,
2359 };
2360
2361 static const struct pstate_funcs silvermont_funcs = {
2362         .get_max = atom_get_max_pstate,
2363         .get_max_physical = atom_get_max_pstate,
2364         .get_min = atom_get_min_pstate,
2365         .get_turbo = atom_get_turbo_pstate,
2366         .get_val = atom_get_val,
2367         .get_scaling = silvermont_get_scaling,
2368         .get_vid = atom_get_vid,
2369 };
2370
2371 static const struct pstate_funcs airmont_funcs = {
2372         .get_max = atom_get_max_pstate,
2373         .get_max_physical = atom_get_max_pstate,
2374         .get_min = atom_get_min_pstate,
2375         .get_turbo = atom_get_turbo_pstate,
2376         .get_val = atom_get_val,
2377         .get_scaling = airmont_get_scaling,
2378         .get_vid = atom_get_vid,
2379 };
2380
2381 static const struct pstate_funcs knl_funcs = {
2382         .get_max = core_get_max_pstate,
2383         .get_max_physical = core_get_max_pstate_physical,
2384         .get_min = core_get_min_pstate,
2385         .get_turbo = knl_get_turbo_pstate,
2386         .get_aperf_mperf_shift = knl_get_aperf_mperf_shift,
2387         .get_scaling = core_get_scaling,
2388         .get_val = core_get_val,
2389 };
2390
2391 #define X86_MATCH(model, policy)                                         \
2392         X86_MATCH_VENDOR_FAM_MODEL_FEATURE(INTEL, 6, INTEL_FAM6_##model, \
2393                                            X86_FEATURE_APERFMPERF, &policy)
2394
2395 static const struct x86_cpu_id intel_pstate_cpu_ids[] = {
2396         X86_MATCH(SANDYBRIDGE,          core_funcs),
2397         X86_MATCH(SANDYBRIDGE_X,        core_funcs),
2398         X86_MATCH(ATOM_SILVERMONT,      silvermont_funcs),
2399         X86_MATCH(IVYBRIDGE,            core_funcs),
2400         X86_MATCH(HASWELL,              core_funcs),
2401         X86_MATCH(BROADWELL,            core_funcs),
2402         X86_MATCH(IVYBRIDGE_X,          core_funcs),
2403         X86_MATCH(HASWELL_X,            core_funcs),
2404         X86_MATCH(HASWELL_L,            core_funcs),
2405         X86_MATCH(HASWELL_G,            core_funcs),
2406         X86_MATCH(BROADWELL_G,          core_funcs),
2407         X86_MATCH(ATOM_AIRMONT,         airmont_funcs),
2408         X86_MATCH(SKYLAKE_L,            core_funcs),
2409         X86_MATCH(BROADWELL_X,          core_funcs),
2410         X86_MATCH(SKYLAKE,              core_funcs),
2411         X86_MATCH(BROADWELL_D,          core_funcs),
2412         X86_MATCH(XEON_PHI_KNL,         knl_funcs),
2413         X86_MATCH(XEON_PHI_KNM,         knl_funcs),
2414         X86_MATCH(ATOM_GOLDMONT,        core_funcs),
2415         X86_MATCH(ATOM_GOLDMONT_PLUS,   core_funcs),
2416         X86_MATCH(SKYLAKE_X,            core_funcs),
2417         X86_MATCH(COMETLAKE,            core_funcs),
2418         X86_MATCH(ICELAKE_X,            core_funcs),
2419         {}
2420 };
2421 MODULE_DEVICE_TABLE(x86cpu, intel_pstate_cpu_ids);
2422
2423 static const struct x86_cpu_id intel_pstate_cpu_oob_ids[] __initconst = {
2424         X86_MATCH(BROADWELL_D,          core_funcs),
2425         X86_MATCH(BROADWELL_X,          core_funcs),
2426         X86_MATCH(SKYLAKE_X,            core_funcs),
2427         X86_MATCH(ICELAKE_X,            core_funcs),
2428         X86_MATCH(SAPPHIRERAPIDS_X,     core_funcs),
2429         {}
2430 };
2431
2432 static const struct x86_cpu_id intel_pstate_cpu_ee_disable_ids[] = {
2433         X86_MATCH(KABYLAKE,             core_funcs),
2434         {}
2435 };
2436
2437 static const struct x86_cpu_id intel_pstate_hwp_boost_ids[] = {
2438         X86_MATCH(SKYLAKE_X,            core_funcs),
2439         X86_MATCH(SKYLAKE,              core_funcs),
2440         {}
2441 };
2442
2443 static int intel_pstate_init_cpu(unsigned int cpunum)
2444 {
2445         struct cpudata *cpu;
2446
2447         cpu = all_cpu_data[cpunum];
2448
2449         if (!cpu) {
2450                 cpu = kzalloc(sizeof(*cpu), GFP_KERNEL);
2451                 if (!cpu)
2452                         return -ENOMEM;
2453
2454                 WRITE_ONCE(all_cpu_data[cpunum], cpu);
2455
2456                 cpu->cpu = cpunum;
2457
2458                 cpu->epp_default = -EINVAL;
2459
2460                 if (hwp_active) {
2461                         const struct x86_cpu_id *id;
2462
2463                         intel_pstate_hwp_enable(cpu);
2464
2465                         id = x86_match_cpu(intel_pstate_hwp_boost_ids);
2466                         if (id && intel_pstate_acpi_pm_profile_server())
2467                                 hwp_boost = true;
2468                 }
2469         } else if (hwp_active) {
2470                 /*
2471                  * Re-enable HWP in case this happens after a resume from ACPI
2472                  * S3 if the CPU was offline during the whole system/resume
2473                  * cycle.
2474                  */
2475                 intel_pstate_hwp_reenable(cpu);
2476         }
2477
2478         cpu->epp_powersave = -EINVAL;
2479         cpu->epp_policy = 0;
2480
2481         intel_pstate_get_cpu_pstates(cpu);
2482
2483         pr_debug("controlling: cpu %d\n", cpunum);
2484
2485         return 0;
2486 }
2487
2488 static void intel_pstate_set_update_util_hook(unsigned int cpu_num)
2489 {
2490         struct cpudata *cpu = all_cpu_data[cpu_num];
2491
2492         if (hwp_active && !hwp_boost)
2493                 return;
2494
2495         if (cpu->update_util_set)
2496                 return;
2497
2498         /* Prevent intel_pstate_update_util() from using stale data. */
2499         cpu->sample.time = 0;
2500         cpufreq_add_update_util_hook(cpu_num, &cpu->update_util,
2501                                      (hwp_active ?
2502                                       intel_pstate_update_util_hwp :
2503                                       intel_pstate_update_util));
2504         cpu->update_util_set = true;
2505 }
2506
2507 static void intel_pstate_clear_update_util_hook(unsigned int cpu)
2508 {
2509         struct cpudata *cpu_data = all_cpu_data[cpu];
2510
2511         if (!cpu_data->update_util_set)
2512                 return;
2513
2514         cpufreq_remove_update_util_hook(cpu);
2515         cpu_data->update_util_set = false;
2516         synchronize_rcu();
2517 }
2518
2519 static int intel_pstate_get_max_freq(struct cpudata *cpu)
2520 {
2521         return global.turbo_disabled || global.no_turbo ?
2522                         cpu->pstate.max_freq : cpu->pstate.turbo_freq;
2523 }
2524
2525 static void intel_pstate_update_perf_limits(struct cpudata *cpu,
2526                                             unsigned int policy_min,
2527                                             unsigned int policy_max)
2528 {
2529         int perf_ctl_scaling = cpu->pstate.perf_ctl_scaling;
2530         int32_t max_policy_perf, min_policy_perf;
2531
2532         max_policy_perf = policy_max / perf_ctl_scaling;
2533         if (policy_max == policy_min) {
2534                 min_policy_perf = max_policy_perf;
2535         } else {
2536                 min_policy_perf = policy_min / perf_ctl_scaling;
2537                 min_policy_perf = clamp_t(int32_t, min_policy_perf,
2538                                           0, max_policy_perf);
2539         }
2540
2541         /*
2542          * HWP needs some special consideration, because HWP_REQUEST uses
2543          * abstract values to represent performance rather than pure ratios.
2544          */
2545         if (hwp_active && cpu->pstate.scaling != perf_ctl_scaling) {
2546                 int scaling = cpu->pstate.scaling;
2547                 int freq;
2548
2549                 freq = max_policy_perf * perf_ctl_scaling;
2550                 max_policy_perf = DIV_ROUND_UP(freq, scaling);
2551                 freq = min_policy_perf * perf_ctl_scaling;
2552                 min_policy_perf = DIV_ROUND_UP(freq, scaling);
2553         }
2554
2555         pr_debug("cpu:%d min_policy_perf:%d max_policy_perf:%d\n",
2556                  cpu->cpu, min_policy_perf, max_policy_perf);
2557
2558         /* Normalize user input to [min_perf, max_perf] */
2559         if (per_cpu_limits) {
2560                 cpu->min_perf_ratio = min_policy_perf;
2561                 cpu->max_perf_ratio = max_policy_perf;
2562         } else {
2563                 int turbo_max = cpu->pstate.turbo_pstate;
2564                 int32_t global_min, global_max;
2565
2566                 /* Global limits are in percent of the maximum turbo P-state. */
2567                 global_max = DIV_ROUND_UP(turbo_max * global.max_perf_pct, 100);
2568                 global_min = DIV_ROUND_UP(turbo_max * global.min_perf_pct, 100);
2569                 global_min = clamp_t(int32_t, global_min, 0, global_max);
2570
2571                 pr_debug("cpu:%d global_min:%d global_max:%d\n", cpu->cpu,
2572                          global_min, global_max);
2573
2574                 cpu->min_perf_ratio = max(min_policy_perf, global_min);
2575                 cpu->min_perf_ratio = min(cpu->min_perf_ratio, max_policy_perf);
2576                 cpu->max_perf_ratio = min(max_policy_perf, global_max);
2577                 cpu->max_perf_ratio = max(min_policy_perf, cpu->max_perf_ratio);
2578
2579                 /* Make sure min_perf <= max_perf */
2580                 cpu->min_perf_ratio = min(cpu->min_perf_ratio,
2581                                           cpu->max_perf_ratio);
2582
2583         }
2584         pr_debug("cpu:%d max_perf_ratio:%d min_perf_ratio:%d\n", cpu->cpu,
2585                  cpu->max_perf_ratio,
2586                  cpu->min_perf_ratio);
2587 }
2588
2589 static int intel_pstate_set_policy(struct cpufreq_policy *policy)
2590 {
2591         struct cpudata *cpu;
2592
2593         if (!policy->cpuinfo.max_freq)
2594                 return -ENODEV;
2595
2596         pr_debug("set_policy cpuinfo.max %u policy->max %u\n",
2597                  policy->cpuinfo.max_freq, policy->max);
2598
2599         cpu = all_cpu_data[policy->cpu];
2600         cpu->policy = policy->policy;
2601
2602         mutex_lock(&intel_pstate_limits_lock);
2603
2604         intel_pstate_update_perf_limits(cpu, policy->min, policy->max);
2605
2606         if (cpu->policy == CPUFREQ_POLICY_PERFORMANCE) {
2607                 /*
2608                  * NOHZ_FULL CPUs need this as the governor callback may not
2609                  * be invoked on them.
2610                  */
2611                 intel_pstate_clear_update_util_hook(policy->cpu);
2612                 intel_pstate_max_within_limits(cpu);
2613         } else {
2614                 intel_pstate_set_update_util_hook(policy->cpu);
2615         }
2616
2617         if (hwp_active) {
2618                 /*
2619                  * When hwp_boost was active before and dynamically it
2620                  * was turned off, in that case we need to clear the
2621                  * update util hook.
2622                  */
2623                 if (!hwp_boost)
2624                         intel_pstate_clear_update_util_hook(policy->cpu);
2625                 intel_pstate_hwp_set(policy->cpu);
2626         }
2627
2628         mutex_unlock(&intel_pstate_limits_lock);
2629
2630         return 0;
2631 }
2632
2633 static void intel_pstate_adjust_policy_max(struct cpudata *cpu,
2634                                            struct cpufreq_policy_data *policy)
2635 {
2636         if (!hwp_active &&
2637             cpu->pstate.max_pstate_physical > cpu->pstate.max_pstate &&
2638             policy->max < policy->cpuinfo.max_freq &&
2639             policy->max > cpu->pstate.max_freq) {
2640                 pr_debug("policy->max > max non turbo frequency\n");
2641                 policy->max = policy->cpuinfo.max_freq;
2642         }
2643 }
2644
2645 static void intel_pstate_verify_cpu_policy(struct cpudata *cpu,
2646                                            struct cpufreq_policy_data *policy)
2647 {
2648         int max_freq;
2649
2650         update_turbo_state();
2651         if (hwp_active) {
2652                 intel_pstate_get_hwp_cap(cpu);
2653                 max_freq = global.no_turbo || global.turbo_disabled ?
2654                                 cpu->pstate.max_freq : cpu->pstate.turbo_freq;
2655         } else {
2656                 max_freq = intel_pstate_get_max_freq(cpu);
2657         }
2658         cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, max_freq);
2659
2660         intel_pstate_adjust_policy_max(cpu, policy);
2661 }
2662
2663 static int intel_pstate_verify_policy(struct cpufreq_policy_data *policy)
2664 {
2665         intel_pstate_verify_cpu_policy(all_cpu_data[policy->cpu], policy);
2666
2667         return 0;
2668 }
2669
2670 static int intel_cpufreq_cpu_offline(struct cpufreq_policy *policy)
2671 {
2672         struct cpudata *cpu = all_cpu_data[policy->cpu];
2673
2674         pr_debug("CPU %d going offline\n", cpu->cpu);
2675
2676         if (cpu->suspended)
2677                 return 0;
2678
2679         /*
2680          * If the CPU is an SMT thread and it goes offline with the performance
2681          * settings different from the minimum, it will prevent its sibling
2682          * from getting to lower performance levels, so force the minimum
2683          * performance on CPU offline to prevent that from happening.
2684          */
2685         if (hwp_active)
2686                 intel_pstate_hwp_offline(cpu);
2687         else
2688                 intel_pstate_set_min_pstate(cpu);
2689
2690         intel_pstate_exit_perf_limits(policy);
2691
2692         return 0;
2693 }
2694
2695 static int intel_pstate_cpu_online(struct cpufreq_policy *policy)
2696 {
2697         struct cpudata *cpu = all_cpu_data[policy->cpu];
2698
2699         pr_debug("CPU %d going online\n", cpu->cpu);
2700
2701         intel_pstate_init_acpi_perf_limits(policy);
2702
2703         if (hwp_active) {
2704                 /*
2705                  * Re-enable HWP and clear the "suspended" flag to let "resume"
2706                  * know that it need not do that.
2707                  */
2708                 intel_pstate_hwp_reenable(cpu);
2709                 cpu->suspended = false;
2710         }
2711
2712         return 0;
2713 }
2714
2715 static int intel_pstate_cpu_offline(struct cpufreq_policy *policy)
2716 {
2717         intel_pstate_clear_update_util_hook(policy->cpu);
2718
2719         return intel_cpufreq_cpu_offline(policy);
2720 }
2721
2722 static int intel_pstate_cpu_exit(struct cpufreq_policy *policy)
2723 {
2724         pr_debug("CPU %d exiting\n", policy->cpu);
2725
2726         policy->fast_switch_possible = false;
2727
2728         return 0;
2729 }
2730
2731 static int __intel_pstate_cpu_init(struct cpufreq_policy *policy)
2732 {
2733         struct cpudata *cpu;
2734         int rc;
2735
2736         rc = intel_pstate_init_cpu(policy->cpu);
2737         if (rc)
2738                 return rc;
2739
2740         cpu = all_cpu_data[policy->cpu];
2741
2742         cpu->max_perf_ratio = 0xFF;
2743         cpu->min_perf_ratio = 0;
2744
2745         /* cpuinfo and default policy values */
2746         policy->cpuinfo.min_freq = cpu->pstate.min_freq;
2747         update_turbo_state();
2748         global.turbo_disabled_mf = global.turbo_disabled;
2749         policy->cpuinfo.max_freq = global.turbo_disabled ?
2750                         cpu->pstate.max_freq : cpu->pstate.turbo_freq;
2751
2752         policy->min = policy->cpuinfo.min_freq;
2753         policy->max = policy->cpuinfo.max_freq;
2754
2755         intel_pstate_init_acpi_perf_limits(policy);
2756
2757         policy->fast_switch_possible = true;
2758
2759         return 0;
2760 }
2761
2762 static int intel_pstate_cpu_init(struct cpufreq_policy *policy)
2763 {
2764         int ret = __intel_pstate_cpu_init(policy);
2765
2766         if (ret)
2767                 return ret;
2768
2769         /*
2770          * Set the policy to powersave to provide a valid fallback value in case
2771          * the default cpufreq governor is neither powersave nor performance.
2772          */
2773         policy->policy = CPUFREQ_POLICY_POWERSAVE;
2774
2775         if (hwp_active) {
2776                 struct cpudata *cpu = all_cpu_data[policy->cpu];
2777
2778                 cpu->epp_cached = intel_pstate_get_epp(cpu, 0);
2779         }
2780
2781         return 0;
2782 }
2783
2784 static struct cpufreq_driver intel_pstate = {
2785         .flags          = CPUFREQ_CONST_LOOPS,
2786         .verify         = intel_pstate_verify_policy,
2787         .setpolicy      = intel_pstate_set_policy,
2788         .suspend        = intel_pstate_suspend,
2789         .resume         = intel_pstate_resume,
2790         .init           = intel_pstate_cpu_init,
2791         .exit           = intel_pstate_cpu_exit,
2792         .offline        = intel_pstate_cpu_offline,
2793         .online         = intel_pstate_cpu_online,
2794         .update_limits  = intel_pstate_update_limits,
2795         .name           = "intel_pstate",
2796 };
2797
2798 static int intel_cpufreq_verify_policy(struct cpufreq_policy_data *policy)
2799 {
2800         struct cpudata *cpu = all_cpu_data[policy->cpu];
2801
2802         intel_pstate_verify_cpu_policy(cpu, policy);
2803         intel_pstate_update_perf_limits(cpu, policy->min, policy->max);
2804
2805         return 0;
2806 }
2807
2808 /* Use of trace in passive mode:
2809  *
2810  * In passive mode the trace core_busy field (also known as the
2811  * performance field, and lablelled as such on the graphs; also known as
2812  * core_avg_perf) is not needed and so is re-assigned to indicate if the
2813  * driver call was via the normal or fast switch path. Various graphs
2814  * output from the intel_pstate_tracer.py utility that include core_busy
2815  * (or performance or core_avg_perf) have a fixed y-axis from 0 to 100%,
2816  * so we use 10 to indicate the normal path through the driver, and
2817  * 90 to indicate the fast switch path through the driver.
2818  * The scaled_busy field is not used, and is set to 0.
2819  */
2820
2821 #define INTEL_PSTATE_TRACE_TARGET 10
2822 #define INTEL_PSTATE_TRACE_FAST_SWITCH 90
2823
2824 static void intel_cpufreq_trace(struct cpudata *cpu, unsigned int trace_type, int old_pstate)
2825 {
2826         struct sample *sample;
2827
2828         if (!trace_pstate_sample_enabled())
2829                 return;
2830
2831         if (!intel_pstate_sample(cpu, ktime_get()))
2832                 return;
2833
2834         sample = &cpu->sample;
2835         trace_pstate_sample(trace_type,
2836                 0,
2837                 old_pstate,
2838                 cpu->pstate.current_pstate,
2839                 sample->mperf,
2840                 sample->aperf,
2841                 sample->tsc,
2842                 get_avg_frequency(cpu),
2843                 fp_toint(cpu->iowait_boost * 100));
2844 }
2845
2846 static void intel_cpufreq_hwp_update(struct cpudata *cpu, u32 min, u32 max,
2847                                      u32 desired, bool fast_switch)
2848 {
2849         u64 prev = READ_ONCE(cpu->hwp_req_cached), value = prev;
2850
2851         value &= ~HWP_MIN_PERF(~0L);
2852         value |= HWP_MIN_PERF(min);
2853
2854         value &= ~HWP_MAX_PERF(~0L);
2855         value |= HWP_MAX_PERF(max);
2856
2857         value &= ~HWP_DESIRED_PERF(~0L);
2858         value |= HWP_DESIRED_PERF(desired);
2859
2860         if (value == prev)
2861                 return;
2862
2863         WRITE_ONCE(cpu->hwp_req_cached, value);
2864         if (fast_switch)
2865                 wrmsrl(MSR_HWP_REQUEST, value);
2866         else
2867                 wrmsrl_on_cpu(cpu->cpu, MSR_HWP_REQUEST, value);
2868 }
2869
2870 static void intel_cpufreq_perf_ctl_update(struct cpudata *cpu,
2871                                           u32 target_pstate, bool fast_switch)
2872 {
2873         if (fast_switch)
2874                 wrmsrl(MSR_IA32_PERF_CTL,
2875                        pstate_funcs.get_val(cpu, target_pstate));
2876         else
2877                 wrmsrl_on_cpu(cpu->cpu, MSR_IA32_PERF_CTL,
2878                               pstate_funcs.get_val(cpu, target_pstate));
2879 }
2880
2881 static int intel_cpufreq_update_pstate(struct cpufreq_policy *policy,
2882                                        int target_pstate, bool fast_switch)
2883 {
2884         struct cpudata *cpu = all_cpu_data[policy->cpu];
2885         int old_pstate = cpu->pstate.current_pstate;
2886
2887         target_pstate = intel_pstate_prepare_request(cpu, target_pstate);
2888         if (hwp_active) {
2889                 int max_pstate = policy->strict_target ?
2890                                         target_pstate : cpu->max_perf_ratio;
2891
2892                 intel_cpufreq_hwp_update(cpu, target_pstate, max_pstate, 0,
2893                                          fast_switch);
2894         } else if (target_pstate != old_pstate) {
2895                 intel_cpufreq_perf_ctl_update(cpu, target_pstate, fast_switch);
2896         }
2897
2898         cpu->pstate.current_pstate = target_pstate;
2899
2900         intel_cpufreq_trace(cpu, fast_switch ? INTEL_PSTATE_TRACE_FAST_SWITCH :
2901                             INTEL_PSTATE_TRACE_TARGET, old_pstate);
2902
2903         return target_pstate;
2904 }
2905
2906 static int intel_cpufreq_target(struct cpufreq_policy *policy,
2907                                 unsigned int target_freq,
2908                                 unsigned int relation)
2909 {
2910         struct cpudata *cpu = all_cpu_data[policy->cpu];
2911         struct cpufreq_freqs freqs;
2912         int target_pstate;
2913
2914         update_turbo_state();
2915
2916         freqs.old = policy->cur;
2917         freqs.new = target_freq;
2918
2919         cpufreq_freq_transition_begin(policy, &freqs);
2920
2921         switch (relation) {
2922         case CPUFREQ_RELATION_L:
2923                 target_pstate = DIV_ROUND_UP(freqs.new, cpu->pstate.scaling);
2924                 break;
2925         case CPUFREQ_RELATION_H:
2926                 target_pstate = freqs.new / cpu->pstate.scaling;
2927                 break;
2928         default:
2929                 target_pstate = DIV_ROUND_CLOSEST(freqs.new, cpu->pstate.scaling);
2930                 break;
2931         }
2932
2933         target_pstate = intel_cpufreq_update_pstate(policy, target_pstate, false);
2934
2935         freqs.new = target_pstate * cpu->pstate.scaling;
2936
2937         cpufreq_freq_transition_end(policy, &freqs, false);
2938
2939         return 0;
2940 }
2941
2942 static unsigned int intel_cpufreq_fast_switch(struct cpufreq_policy *policy,
2943                                               unsigned int target_freq)
2944 {
2945         struct cpudata *cpu = all_cpu_data[policy->cpu];
2946         int target_pstate;
2947
2948         update_turbo_state();
2949
2950         target_pstate = DIV_ROUND_UP(target_freq, cpu->pstate.scaling);
2951
2952         target_pstate = intel_cpufreq_update_pstate(policy, target_pstate, true);
2953
2954         return target_pstate * cpu->pstate.scaling;
2955 }
2956
2957 static void intel_cpufreq_adjust_perf(unsigned int cpunum,
2958                                       unsigned long min_perf,
2959                                       unsigned long target_perf,
2960                                       unsigned long capacity)
2961 {
2962         struct cpudata *cpu = all_cpu_data[cpunum];
2963         u64 hwp_cap = READ_ONCE(cpu->hwp_cap_cached);
2964         int old_pstate = cpu->pstate.current_pstate;
2965         int cap_pstate, min_pstate, max_pstate, target_pstate;
2966
2967         update_turbo_state();
2968         cap_pstate = global.turbo_disabled ? HWP_GUARANTEED_PERF(hwp_cap) :
2969                                              HWP_HIGHEST_PERF(hwp_cap);
2970
2971         /* Optimization: Avoid unnecessary divisions. */
2972
2973         target_pstate = cap_pstate;
2974         if (target_perf < capacity)
2975                 target_pstate = DIV_ROUND_UP(cap_pstate * target_perf, capacity);
2976
2977         min_pstate = cap_pstate;
2978         if (min_perf < capacity)
2979                 min_pstate = DIV_ROUND_UP(cap_pstate * min_perf, capacity);
2980
2981         if (min_pstate < cpu->pstate.min_pstate)
2982                 min_pstate = cpu->pstate.min_pstate;
2983
2984         if (min_pstate < cpu->min_perf_ratio)
2985                 min_pstate = cpu->min_perf_ratio;
2986
2987         max_pstate = min(cap_pstate, cpu->max_perf_ratio);
2988         if (max_pstate < min_pstate)
2989                 max_pstate = min_pstate;
2990
2991         target_pstate = clamp_t(int, target_pstate, min_pstate, max_pstate);
2992
2993         intel_cpufreq_hwp_update(cpu, min_pstate, max_pstate, target_pstate, true);
2994
2995         cpu->pstate.current_pstate = target_pstate;
2996         intel_cpufreq_trace(cpu, INTEL_PSTATE_TRACE_FAST_SWITCH, old_pstate);
2997 }
2998
2999 static int intel_cpufreq_cpu_init(struct cpufreq_policy *policy)
3000 {
3001         struct freq_qos_request *req;
3002         struct cpudata *cpu;
3003         struct device *dev;
3004         int ret, freq;
3005
3006         dev = get_cpu_device(policy->cpu);
3007         if (!dev)
3008                 return -ENODEV;
3009
3010         ret = __intel_pstate_cpu_init(policy);
3011         if (ret)
3012                 return ret;
3013
3014         policy->cpuinfo.transition_latency = INTEL_CPUFREQ_TRANSITION_LATENCY;
3015         /* This reflects the intel_pstate_get_cpu_pstates() setting. */
3016         policy->cur = policy->cpuinfo.min_freq;
3017
3018         req = kcalloc(2, sizeof(*req), GFP_KERNEL);
3019         if (!req) {
3020                 ret = -ENOMEM;
3021                 goto pstate_exit;
3022         }
3023
3024         cpu = all_cpu_data[policy->cpu];
3025
3026         if (hwp_active) {
3027                 u64 value;
3028
3029                 policy->transition_delay_us = INTEL_CPUFREQ_TRANSITION_DELAY_HWP;
3030
3031                 intel_pstate_get_hwp_cap(cpu);
3032
3033                 rdmsrl_on_cpu(cpu->cpu, MSR_HWP_REQUEST, &value);
3034                 WRITE_ONCE(cpu->hwp_req_cached, value);
3035
3036                 cpu->epp_cached = intel_pstate_get_epp(cpu, value);
3037         } else {
3038                 policy->transition_delay_us = INTEL_CPUFREQ_TRANSITION_DELAY;
3039         }
3040
3041         freq = DIV_ROUND_UP(cpu->pstate.turbo_freq * global.min_perf_pct, 100);
3042
3043         ret = freq_qos_add_request(&policy->constraints, req, FREQ_QOS_MIN,
3044                                    freq);
3045         if (ret < 0) {
3046                 dev_err(dev, "Failed to add min-freq constraint (%d)\n", ret);
3047                 goto free_req;
3048         }
3049
3050         freq = DIV_ROUND_UP(cpu->pstate.turbo_freq * global.max_perf_pct, 100);
3051
3052         ret = freq_qos_add_request(&policy->constraints, req + 1, FREQ_QOS_MAX,
3053                                    freq);
3054         if (ret < 0) {
3055                 dev_err(dev, "Failed to add max-freq constraint (%d)\n", ret);
3056                 goto remove_min_req;
3057         }
3058
3059         policy->driver_data = req;
3060
3061         return 0;
3062
3063 remove_min_req:
3064         freq_qos_remove_request(req);
3065 free_req:
3066         kfree(req);
3067 pstate_exit:
3068         intel_pstate_exit_perf_limits(policy);
3069
3070         return ret;
3071 }
3072
3073 static int intel_cpufreq_cpu_exit(struct cpufreq_policy *policy)
3074 {
3075         struct freq_qos_request *req;
3076
3077         req = policy->driver_data;
3078
3079         freq_qos_remove_request(req + 1);
3080         freq_qos_remove_request(req);
3081         kfree(req);
3082
3083         return intel_pstate_cpu_exit(policy);
3084 }
3085
3086 static int intel_cpufreq_suspend(struct cpufreq_policy *policy)
3087 {
3088         intel_pstate_suspend(policy);
3089
3090         if (hwp_active) {
3091                 struct cpudata *cpu = all_cpu_data[policy->cpu];
3092                 u64 value = READ_ONCE(cpu->hwp_req_cached);
3093
3094                 /*
3095                  * Clear the desired perf field in MSR_HWP_REQUEST in case
3096                  * intel_cpufreq_adjust_perf() is in use and the last value
3097                  * written by it may not be suitable.
3098                  */
3099                 value &= ~HWP_DESIRED_PERF(~0L);
3100                 wrmsrl_on_cpu(cpu->cpu, MSR_HWP_REQUEST, value);
3101                 WRITE_ONCE(cpu->hwp_req_cached, value);
3102         }
3103
3104         return 0;
3105 }
3106
3107 static struct cpufreq_driver intel_cpufreq = {
3108         .flags          = CPUFREQ_CONST_LOOPS,
3109         .verify         = intel_cpufreq_verify_policy,
3110         .target         = intel_cpufreq_target,
3111         .fast_switch    = intel_cpufreq_fast_switch,
3112         .init           = intel_cpufreq_cpu_init,
3113         .exit           = intel_cpufreq_cpu_exit,
3114         .offline        = intel_cpufreq_cpu_offline,
3115         .online         = intel_pstate_cpu_online,
3116         .suspend        = intel_cpufreq_suspend,
3117         .resume         = intel_pstate_resume,
3118         .update_limits  = intel_pstate_update_limits,
3119         .name           = "intel_cpufreq",
3120 };
3121
3122 static struct cpufreq_driver *default_driver;
3123
3124 static void intel_pstate_driver_cleanup(void)
3125 {
3126         unsigned int cpu;
3127
3128         cpus_read_lock();
3129         for_each_online_cpu(cpu) {
3130                 if (all_cpu_data[cpu]) {
3131                         if (intel_pstate_driver == &intel_pstate)
3132                                 intel_pstate_clear_update_util_hook(cpu);
3133
3134                         spin_lock(&hwp_notify_lock);
3135                         kfree(all_cpu_data[cpu]);
3136                         WRITE_ONCE(all_cpu_data[cpu], NULL);
3137                         spin_unlock(&hwp_notify_lock);
3138                 }
3139         }
3140         cpus_read_unlock();
3141
3142         intel_pstate_driver = NULL;
3143 }
3144
3145 static int intel_pstate_register_driver(struct cpufreq_driver *driver)
3146 {
3147         int ret;
3148
3149         if (driver == &intel_pstate)
3150                 intel_pstate_sysfs_expose_hwp_dynamic_boost();
3151
3152         memset(&global, 0, sizeof(global));
3153         global.max_perf_pct = 100;
3154
3155         intel_pstate_driver = driver;
3156         ret = cpufreq_register_driver(intel_pstate_driver);
3157         if (ret) {
3158                 intel_pstate_driver_cleanup();
3159                 return ret;
3160         }
3161
3162         global.min_perf_pct = min_perf_pct_min();
3163
3164         return 0;
3165 }
3166
3167 static ssize_t intel_pstate_show_status(char *buf)
3168 {
3169         if (!intel_pstate_driver)
3170                 return sprintf(buf, "off\n");
3171
3172         return sprintf(buf, "%s\n", intel_pstate_driver == &intel_pstate ?
3173                                         "active" : "passive");
3174 }
3175
3176 static int intel_pstate_update_status(const char *buf, size_t size)
3177 {
3178         if (size == 3 && !strncmp(buf, "off", size)) {
3179                 if (!intel_pstate_driver)
3180                         return -EINVAL;
3181
3182                 if (hwp_active)
3183                         return -EBUSY;
3184
3185                 cpufreq_unregister_driver(intel_pstate_driver);
3186                 intel_pstate_driver_cleanup();
3187                 return 0;
3188         }
3189
3190         if (size == 6 && !strncmp(buf, "active", size)) {
3191                 if (intel_pstate_driver) {
3192                         if (intel_pstate_driver == &intel_pstate)
3193                                 return 0;
3194
3195                         cpufreq_unregister_driver(intel_pstate_driver);
3196                 }
3197
3198                 return intel_pstate_register_driver(&intel_pstate);
3199         }
3200
3201         if (size == 7 && !strncmp(buf, "passive", size)) {
3202                 if (intel_pstate_driver) {
3203                         if (intel_pstate_driver == &intel_cpufreq)
3204                                 return 0;
3205
3206                         cpufreq_unregister_driver(intel_pstate_driver);
3207                         intel_pstate_sysfs_hide_hwp_dynamic_boost();
3208                 }
3209
3210                 return intel_pstate_register_driver(&intel_cpufreq);
3211         }
3212
3213         return -EINVAL;
3214 }
3215
3216 static int no_load __initdata;
3217 static int no_hwp __initdata;
3218 static int hwp_only __initdata;
3219 static unsigned int force_load __initdata;
3220
3221 static int __init intel_pstate_msrs_not_valid(void)
3222 {
3223         if (!pstate_funcs.get_max() ||
3224             !pstate_funcs.get_min() ||
3225             !pstate_funcs.get_turbo())
3226                 return -ENODEV;
3227
3228         return 0;
3229 }
3230
3231 static void __init copy_cpu_funcs(struct pstate_funcs *funcs)
3232 {
3233         pstate_funcs.get_max   = funcs->get_max;
3234         pstate_funcs.get_max_physical = funcs->get_max_physical;
3235         pstate_funcs.get_min   = funcs->get_min;
3236         pstate_funcs.get_turbo = funcs->get_turbo;
3237         pstate_funcs.get_scaling = funcs->get_scaling;
3238         pstate_funcs.get_val   = funcs->get_val;
3239         pstate_funcs.get_vid   = funcs->get_vid;
3240         pstate_funcs.get_aperf_mperf_shift = funcs->get_aperf_mperf_shift;
3241 }
3242
3243 #ifdef CONFIG_ACPI
3244
3245 static bool __init intel_pstate_no_acpi_pss(void)
3246 {
3247         int i;
3248
3249         for_each_possible_cpu(i) {
3250                 acpi_status status;
3251                 union acpi_object *pss;
3252                 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
3253                 struct acpi_processor *pr = per_cpu(processors, i);
3254
3255                 if (!pr)
3256                         continue;
3257
3258                 status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
3259                 if (ACPI_FAILURE(status))
3260                         continue;
3261
3262                 pss = buffer.pointer;
3263                 if (pss && pss->type == ACPI_TYPE_PACKAGE) {
3264                         kfree(pss);
3265                         return false;
3266                 }
3267
3268                 kfree(pss);
3269         }
3270
3271         pr_debug("ACPI _PSS not found\n");
3272         return true;
3273 }
3274
3275 static bool __init intel_pstate_no_acpi_pcch(void)
3276 {
3277         acpi_status status;
3278         acpi_handle handle;
3279
3280         status = acpi_get_handle(NULL, "\\_SB", &handle);
3281         if (ACPI_FAILURE(status))
3282                 goto not_found;
3283
3284         if (acpi_has_method(handle, "PCCH"))
3285                 return false;
3286
3287 not_found:
3288         pr_debug("ACPI PCCH not found\n");
3289         return true;
3290 }
3291
3292 static bool __init intel_pstate_has_acpi_ppc(void)
3293 {
3294         int i;
3295
3296         for_each_possible_cpu(i) {
3297                 struct acpi_processor *pr = per_cpu(processors, i);
3298
3299                 if (!pr)
3300                         continue;
3301                 if (acpi_has_method(pr->handle, "_PPC"))
3302                         return true;
3303         }
3304         pr_debug("ACPI _PPC not found\n");
3305         return false;
3306 }
3307
3308 enum {
3309         PSS,
3310         PPC,
3311 };
3312
3313 /* Hardware vendor-specific info that has its own power management modes */
3314 static struct acpi_platform_list plat_info[] __initdata = {
3315         {"HP    ", "ProLiant", 0, ACPI_SIG_FADT, all_versions, NULL, PSS},
3316         {"ORACLE", "X4-2    ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
3317         {"ORACLE", "X4-2L   ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
3318         {"ORACLE", "X4-2B   ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
3319         {"ORACLE", "X3-2    ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
3320         {"ORACLE", "X3-2L   ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
3321         {"ORACLE", "X3-2B   ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
3322         {"ORACLE", "X4470M2 ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
3323         {"ORACLE", "X4270M3 ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
3324         {"ORACLE", "X4270M2 ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
3325         {"ORACLE", "X4170M2 ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
3326         {"ORACLE", "X4170 M3", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
3327         {"ORACLE", "X4275 M3", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
3328         {"ORACLE", "X6-2    ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
3329         {"ORACLE", "Sudbury ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
3330         { } /* End */
3331 };
3332
3333 #define BITMASK_OOB     (BIT(8) | BIT(18))
3334
3335 static bool __init intel_pstate_platform_pwr_mgmt_exists(void)
3336 {
3337         const struct x86_cpu_id *id;
3338         u64 misc_pwr;
3339         int idx;
3340
3341         id = x86_match_cpu(intel_pstate_cpu_oob_ids);
3342         if (id) {
3343                 rdmsrl(MSR_MISC_PWR_MGMT, misc_pwr);
3344                 if (misc_pwr & BITMASK_OOB) {
3345                         pr_debug("Bit 8 or 18 in the MISC_PWR_MGMT MSR set\n");
3346                         pr_debug("P states are controlled in Out of Band mode by the firmware/hardware\n");
3347                         return true;
3348                 }
3349         }
3350
3351         idx = acpi_match_platform_list(plat_info);
3352         if (idx < 0)
3353                 return false;
3354
3355         switch (plat_info[idx].data) {
3356         case PSS:
3357                 if (!intel_pstate_no_acpi_pss())
3358                         return false;
3359
3360                 return intel_pstate_no_acpi_pcch();
3361         case PPC:
3362                 return intel_pstate_has_acpi_ppc() && !force_load;
3363         }
3364
3365         return false;
3366 }
3367
3368 static void intel_pstate_request_control_from_smm(void)
3369 {
3370         /*
3371          * It may be unsafe to request P-states control from SMM if _PPC support
3372          * has not been enabled.
3373          */
3374         if (acpi_ppc)
3375                 acpi_processor_pstate_control();
3376 }
3377 #else /* CONFIG_ACPI not enabled */
3378 static inline bool intel_pstate_platform_pwr_mgmt_exists(void) { return false; }
3379 static inline bool intel_pstate_has_acpi_ppc(void) { return false; }
3380 static inline void intel_pstate_request_control_from_smm(void) {}
3381 #endif /* CONFIG_ACPI */
3382
3383 #define INTEL_PSTATE_HWP_BROADWELL      0x01
3384
3385 #define X86_MATCH_HWP(model, hwp_mode)                                  \
3386         X86_MATCH_VENDOR_FAM_MODEL_FEATURE(INTEL, 6, INTEL_FAM6_##model, \
3387                                            X86_FEATURE_HWP, hwp_mode)
3388
3389 static const struct x86_cpu_id hwp_support_ids[] __initconst = {
3390         X86_MATCH_HWP(BROADWELL_X,      INTEL_PSTATE_HWP_BROADWELL),
3391         X86_MATCH_HWP(BROADWELL_D,      INTEL_PSTATE_HWP_BROADWELL),
3392         X86_MATCH_HWP(ANY,              0),
3393         {}
3394 };
3395
3396 static bool intel_pstate_hwp_is_enabled(void)
3397 {
3398         u64 value;
3399
3400         rdmsrl(MSR_PM_ENABLE, value);
3401         return !!(value & 0x1);
3402 }
3403
3404 static const struct x86_cpu_id intel_epp_balance_perf[] = {
3405         /*
3406          * Set EPP value as 102, this is the max suggested EPP
3407          * which can result in one core turbo frequency for
3408          * AlderLake Mobile CPUs.
3409          */
3410         X86_MATCH_INTEL_FAM6_MODEL(ALDERLAKE_L, 102),
3411         {}
3412 };
3413
3414 static int __init intel_pstate_init(void)
3415 {
3416         static struct cpudata **_all_cpu_data;
3417         const struct x86_cpu_id *id;
3418         int rc;
3419
3420         if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
3421                 return -ENODEV;
3422
3423         id = x86_match_cpu(hwp_support_ids);
3424         if (id) {
3425                 bool hwp_forced = intel_pstate_hwp_is_enabled();
3426
3427                 if (hwp_forced)
3428                         pr_info("HWP enabled by BIOS\n");
3429                 else if (no_load)
3430                         return -ENODEV;
3431
3432                 copy_cpu_funcs(&core_funcs);
3433                 /*
3434                  * Avoid enabling HWP for processors without EPP support,
3435                  * because that means incomplete HWP implementation which is a
3436                  * corner case and supporting it is generally problematic.
3437                  *
3438                  * If HWP is enabled already, though, there is no choice but to
3439                  * deal with it.
3440                  */
3441                 if ((!no_hwp && boot_cpu_has(X86_FEATURE_HWP_EPP)) || hwp_forced) {
3442                         WRITE_ONCE(hwp_active, 1);
3443                         hwp_mode_bdw = id->driver_data;
3444                         intel_pstate.attr = hwp_cpufreq_attrs;
3445                         intel_cpufreq.attr = hwp_cpufreq_attrs;
3446                         intel_cpufreq.flags |= CPUFREQ_NEED_UPDATE_LIMITS;
3447                         intel_cpufreq.adjust_perf = intel_cpufreq_adjust_perf;
3448                         if (!default_driver)
3449                                 default_driver = &intel_pstate;
3450
3451                         if (boot_cpu_has(X86_FEATURE_HYBRID_CPU))
3452                                 intel_pstate_cppc_set_cpu_scaling();
3453
3454                         goto hwp_cpu_matched;
3455                 }
3456                 pr_info("HWP not enabled\n");
3457         } else {
3458                 if (no_load)
3459                         return -ENODEV;
3460
3461                 id = x86_match_cpu(intel_pstate_cpu_ids);
3462                 if (!id) {
3463                         pr_info("CPU model not supported\n");
3464                         return -ENODEV;
3465                 }
3466
3467                 copy_cpu_funcs((struct pstate_funcs *)id->driver_data);
3468         }
3469
3470         if (intel_pstate_msrs_not_valid()) {
3471                 pr_info("Invalid MSRs\n");
3472                 return -ENODEV;
3473         }
3474         /* Without HWP start in the passive mode. */
3475         if (!default_driver)
3476                 default_driver = &intel_cpufreq;
3477
3478 hwp_cpu_matched:
3479         /*
3480          * The Intel pstate driver will be ignored if the platform
3481          * firmware has its own power management modes.
3482          */
3483         if (intel_pstate_platform_pwr_mgmt_exists()) {
3484                 pr_info("P-states controlled by the platform\n");
3485                 return -ENODEV;
3486         }
3487
3488         if (!hwp_active && hwp_only)
3489                 return -ENOTSUPP;
3490
3491         pr_info("Intel P-state driver initializing\n");
3492
3493         _all_cpu_data = vzalloc(array_size(sizeof(void *), num_possible_cpus()));
3494         if (!_all_cpu_data)
3495                 return -ENOMEM;
3496
3497         WRITE_ONCE(all_cpu_data, _all_cpu_data);
3498
3499         intel_pstate_request_control_from_smm();
3500
3501         intel_pstate_sysfs_expose_params();
3502
3503         if (hwp_active) {
3504                 const struct x86_cpu_id *id = x86_match_cpu(intel_epp_balance_perf);
3505
3506                 if (id)
3507                         epp_values[EPP_INDEX_BALANCE_PERFORMANCE] = id->driver_data;
3508         }
3509
3510         mutex_lock(&intel_pstate_driver_lock);
3511         rc = intel_pstate_register_driver(default_driver);
3512         mutex_unlock(&intel_pstate_driver_lock);
3513         if (rc) {
3514                 intel_pstate_sysfs_remove();
3515                 return rc;
3516         }
3517
3518         if (hwp_active) {
3519                 const struct x86_cpu_id *id;
3520
3521                 id = x86_match_cpu(intel_pstate_cpu_ee_disable_ids);
3522                 if (id) {
3523                         set_power_ctl_ee_state(false);
3524                         pr_info("Disabling energy efficiency optimization\n");
3525                 }
3526
3527                 pr_info("HWP enabled\n");
3528         } else if (boot_cpu_has(X86_FEATURE_HYBRID_CPU)) {
3529                 pr_warn("Problematic setup: Hybrid processor with disabled HWP\n");
3530         }
3531
3532         return 0;
3533 }
3534 device_initcall(intel_pstate_init);
3535
3536 static int __init intel_pstate_setup(char *str)
3537 {
3538         if (!str)
3539                 return -EINVAL;
3540
3541         if (!strcmp(str, "disable"))
3542                 no_load = 1;
3543         else if (!strcmp(str, "active"))
3544                 default_driver = &intel_pstate;
3545         else if (!strcmp(str, "passive"))
3546                 default_driver = &intel_cpufreq;
3547
3548         if (!strcmp(str, "no_hwp"))
3549                 no_hwp = 1;
3550
3551         if (!strcmp(str, "force"))
3552                 force_load = 1;
3553         if (!strcmp(str, "hwp_only"))
3554                 hwp_only = 1;
3555         if (!strcmp(str, "per_cpu_perf_limits"))
3556                 per_cpu_limits = true;
3557
3558 #ifdef CONFIG_ACPI
3559         if (!strcmp(str, "support_acpi_ppc"))
3560                 acpi_ppc = true;
3561 #endif
3562
3563         return 0;
3564 }
3565 early_param("intel_pstate", intel_pstate_setup);
3566
3567 MODULE_AUTHOR("Dirk Brandewie <dirk.j.brandewie@intel.com>");
3568 MODULE_DESCRIPTION("'intel_pstate' - P state driver Intel Core processors");
3569 MODULE_LICENSE("GPL");