drivers/cpufreq/acpi-cpufreq.c

   1 /*
   2  * acpi-cpufreq.c - ACPI Processor P-States Driver
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *  Copyright (C) 2002 - 2004 Dominik Brodowski <linux@brodo.de>
   7  *  Copyright (C) 2006       Denis Sadykov <denis.m.sadykov@intel.com>
   8  *
   9  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  10  *
  11  *  This program is free software; you can redistribute it and/or modify
  12  *  it under the terms of the GNU General Public License as published by
  13  *  the Free Software Foundation; either version 2 of the License, or (at
  14  *  your option) any later version.
  15  *
  16  *  This program is distributed in the hope that it will be useful, but
  17  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  *  General Public License for more details.
  20  *
  21  *  You should have received a copy of the GNU General Public License along
  22  *  with this program; if not, write to the Free Software Foundation, Inc.,
  23  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  24  *
  25  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  26  */
  27
  28 #include <linux/kernel.h>
  29 #include <linux/module.h>
  30 #include <linux/init.h>
  31 #include <linux/smp.h>
  32 #include <linux/sched.h>
  33 #include <linux/cpufreq.h>
  34 #include <linux/compiler.h>
  35 #include <linux/dmi.h>
  36 #include <linux/slab.h>
  37
  38 #include <linux/acpi.h>
  39 #include <linux/io.h>
  40 #include <linux/delay.h>
  41 #include <linux/uaccess.h>
  42
  43 #include <acpi/processor.h>
  44
  45 #include <asm/msr.h>
  46 #include <asm/processor.h>
  47 #include <asm/cpufeature.h>
  48 #include "mperf.h"
  49
  50 MODULE_AUTHOR("Paul Diefenbaugh, Dominik Brodowski");
  51 MODULE_DESCRIPTION("ACPI Processor P-States Driver");
  52 MODULE_LICENSE("GPL");
  53
  54 #define PFX "acpi-cpufreq: "
  55
  56 enum {
  57         UNDEFINED_CAPABLE = 0,
  58         SYSTEM_INTEL_MSR_CAPABLE,
  59         SYSTEM_AMD_MSR_CAPABLE,
  60         SYSTEM_IO_CAPABLE,
  61 };
  62
  63 #define INTEL_MSR_RANGE         (0xffff)
  64 #define AMD_MSR_RANGE           (0x7)
  65
  66 #define MSR_K7_HWCR_CPB_DIS     (1ULL << 25)
  67
  68 struct acpi_cpufreq_data {
  69         struct acpi_processor_performance *acpi_data;
  70         struct cpufreq_frequency_table *freq_table;
  71         unsigned int resume;
  72         unsigned int cpu_feature;
  73 };
  74
  75 static DEFINE_PER_CPU(struct acpi_cpufreq_data *, acfreq_data);
  76
  77 /* acpi_perf_data is a pointer to percpu data. */
  78 static struct acpi_processor_performance __percpu *acpi_perf_data;
  79
  80 static struct cpufreq_driver acpi_cpufreq_driver;
  81
  82 static unsigned int acpi_pstate_strict;
  83 static bool boost_enabled, boost_supported;
  84 static struct msr __percpu *msrs;
  85
  86 static bool boost_state(unsigned int cpu)
  87 {
  88         u32 lo, hi;
  89         u64 msr;
  90
  91         switch (boot_cpu_data.x86_vendor) {
  92         case X86_VENDOR_INTEL:
  93                 rdmsr_on_cpu(cpu, MSR_IA32_MISC_ENABLE, &lo, &hi);
  94                 msr = lo | ((u64)hi << 32);
  95                 return !(msr & MSR_IA32_MISC_ENABLE_TURBO_DISABLE);
  96         case X86_VENDOR_AMD:
  97                 rdmsr_on_cpu(cpu, MSR_K7_HWCR, &lo, &hi);
  98                 msr = lo | ((u64)hi << 32);
  99                 return !(msr & MSR_K7_HWCR_CPB_DIS);
 100         }
 101         return false;
 102 }
 103
 104 static void boost_set_msrs(bool enable, const struct cpumask *cpumask)
 105 {
 106         u32 cpu;
 107         u32 msr_addr;
 108         u64 msr_mask;
 109
 110         switch (boot_cpu_data.x86_vendor) {
 111         case X86_VENDOR_INTEL:
 112                 msr_addr = MSR_IA32_MISC_ENABLE;
 113                 msr_mask = MSR_IA32_MISC_ENABLE_TURBO_DISABLE;
 114                 break;
 115         case X86_VENDOR_AMD:
 116                 msr_addr = MSR_K7_HWCR;
 117                 msr_mask = MSR_K7_HWCR_CPB_DIS;
 118                 break;
 119         default:
 120                 return;
 121         }
 122
 123         rdmsr_on_cpus(cpumask, msr_addr, msrs);
 124
 125         for_each_cpu(cpu, cpumask) {
 126                 struct msr *reg = per_cpu_ptr(msrs, cpu);
 127                 if (enable)
 128                         reg->q &= ~msr_mask;
 129                 else
 130                         reg->q |= msr_mask;
 131         }
 132
 133         wrmsr_on_cpus(cpumask, msr_addr, msrs);
 134 }
 135
 136 static ssize_t _store_boost(const char *buf, size_t count)
 137 {
 138         int ret;
 139         unsigned long val = 0;
 140
 141         if (!boost_supported)
 142                 return -EINVAL;
 143
 144         ret = kstrtoul(buf, 10, &val);
 145         if (ret || (val > 1))
 146                 return -EINVAL;
 147
 148         if ((val && boost_enabled) || (!val && !boost_enabled))
 149                 return count;
 150
 151         get_online_cpus();
 152
 153         boost_set_msrs(val, cpu_online_mask);
 154
 155         put_online_cpus();
 156
 157         boost_enabled = val;
 158         pr_debug("Core Boosting %sabled.\n", val ? "en" : "dis");
 159
 160         return count;
 161 }
 162
 163 static ssize_t store_global_boost(struct kobject *kobj, struct attribute *attr,
 164                                   const char *buf, size_t count)
 165 {
 166         return _store_boost(buf, count);
 167 }
 168
 169 static ssize_t show_global_boost(struct kobject *kobj,
 170                                  struct attribute *attr, char *buf)
 171 {
 172         return sprintf(buf, "%u\n", boost_enabled);
 173 }
 174
 175 static struct global_attr global_boost = __ATTR(boost, 0644,
 176                                                 show_global_boost,
 177                                                 store_global_boost);
 178
 179 #ifdef CONFIG_X86_ACPI_CPUFREQ_CPB
 180 static ssize_t store_cpb(struct cpufreq_policy *policy, const char *buf,
 181                          size_t count)
 182 {
 183         return _store_boost(buf, count);
 184 }
 185
 186 static ssize_t show_cpb(struct cpufreq_policy *policy, char *buf)
 187 {
 188         return sprintf(buf, "%u\n", boost_enabled);
 189 }
 190
 191 static struct freq_attr cpb = __ATTR(cpb, 0644, show_cpb, store_cpb);
 192 #endif
 193
 194 static int check_est_cpu(unsigned int cpuid)
 195 {
 196         struct cpuinfo_x86 *cpu = &cpu_data(cpuid);
 197
 198         return cpu_has(cpu, X86_FEATURE_EST);
 199 }
 200
 201 static int check_amd_hwpstate_cpu(unsigned int cpuid)
 202 {
 203         struct cpuinfo_x86 *cpu = &cpu_data(cpuid);
 204
 205         return cpu_has(cpu, X86_FEATURE_HW_PSTATE);
 206 }
 207
 208 static unsigned extract_io(u32 value, struct acpi_cpufreq_data *data)
 209 {
 210         struct acpi_processor_performance *perf;
 211         int i;
 212
 213         perf = data->acpi_data;
 214
 215         for (i = 0; i < perf->state_count; i++) {
 216                 if (value == perf->states[i].status)
 217                         return data->freq_table[i].frequency;
 218         }
 219         return 0;
 220 }
 221
 222 static unsigned extract_msr(u32 msr, struct acpi_cpufreq_data *data)
 223 {
 224         int i;
 225         struct acpi_processor_performance *perf;
 226
 227         if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
 228                 msr &= AMD_MSR_RANGE;
 229         else
 230                 msr &= INTEL_MSR_RANGE;
 231
 232         perf = data->acpi_data;
 233
 234         for (i = 0; data->freq_table[i].frequency != CPUFREQ_TABLE_END; i++) {
 235                 if (msr == perf->states[data->freq_table[i].index].status)
 236                         return data->freq_table[i].frequency;
 237         }
 238         return data->freq_table[0].frequency;
 239 }
 240
 241 static unsigned extract_freq(u32 val, struct acpi_cpufreq_data *data)
 242 {
 243         switch (data->cpu_feature) {
 244         case SYSTEM_INTEL_MSR_CAPABLE:
 245         case SYSTEM_AMD_MSR_CAPABLE:
 246                 return extract_msr(val, data);
 247         case SYSTEM_IO_CAPABLE:
 248                 return extract_io(val, data);
 249         default:
 250                 return 0;
 251         }
 252 }
 253
 254 struct msr_addr {
 255         u32 reg;
 256 };
 257
 258 struct io_addr {
 259         u16 port;
 260         u8 bit_width;
 261 };
 262
 263 struct drv_cmd {
 264         unsigned int type;
 265         const struct cpumask *mask;
 266         union {
 267                 struct msr_addr msr;
 268                 struct io_addr io;
 269         } addr;
 270         u32 val;
 271 };
 272
 273 /* Called via smp_call_function_single(), on the target CPU */
 274 static void do_drv_read(void *_cmd)
 275 {
 276         struct drv_cmd *cmd = _cmd;
 277         u32 h;
 278
 279         switch (cmd->type) {
 280         case SYSTEM_INTEL_MSR_CAPABLE:
 281         case SYSTEM_AMD_MSR_CAPABLE:
 282                 rdmsr(cmd->addr.msr.reg, cmd->val, h);
 283                 break;
 284         case SYSTEM_IO_CAPABLE:
 285                 acpi_os_read_port((acpi_io_address)cmd->addr.io.port,
 286                                 &cmd->val,
 287                                 (u32)cmd->addr.io.bit_width);
 288                 break;
 289         default:
 290                 break;
 291         }
 292 }
 293
 294 /* Called via smp_call_function_many(), on the target CPUs */
 295 static void do_drv_write(void *_cmd)
 296 {
 297         struct drv_cmd *cmd = _cmd;
 298         u32 lo, hi;
 299
 300         switch (cmd->type) {
 301         case SYSTEM_INTEL_MSR_CAPABLE:
 302                 rdmsr(cmd->addr.msr.reg, lo, hi);
 303                 lo = (lo & ~INTEL_MSR_RANGE) | (cmd->val & INTEL_MSR_RANGE);
 304                 wrmsr(cmd->addr.msr.reg, lo, hi);
 305                 break;
 306         case SYSTEM_AMD_MSR_CAPABLE:
 307                 wrmsr(cmd->addr.msr.reg, cmd->val, 0);
 308                 break;
 309         case SYSTEM_IO_CAPABLE:
 310                 acpi_os_write_port((acpi_io_address)cmd->addr.io.port,
 311                                 cmd->val,
 312                                 (u32)cmd->addr.io.bit_width);
 313                 break;
 314         default:
 315                 break;
 316         }
 317 }
 318
 319 static void drv_read(struct drv_cmd *cmd)
 320 {
 321         int err;
 322         cmd->val = 0;
 323
 324         err = smp_call_function_any(cmd->mask, do_drv_read, cmd, 1);
 325         WARN_ON_ONCE(err);      /* smp_call_function_any() was buggy? */
 326 }
 327
 328 static void drv_write(struct drv_cmd *cmd)
 329 {
 330         int this_cpu;
 331
 332         this_cpu = get_cpu();
 333         if (cpumask_test_cpu(this_cpu, cmd->mask))
 334                 do_drv_write(cmd);
 335         smp_call_function_many(cmd->mask, do_drv_write, cmd, 1);
 336         put_cpu();
 337 }
 338
 339 static u32 get_cur_val(const struct cpumask *mask)
 340 {
 341         struct acpi_processor_performance *perf;
 342         struct drv_cmd cmd;
 343
 344         if (unlikely(cpumask_empty(mask)))
 345                 return 0;
 346
 347         switch (per_cpu(acfreq_data, cpumask_first(mask))->cpu_feature) {
 348         case SYSTEM_INTEL_MSR_CAPABLE:
 349                 cmd.type = SYSTEM_INTEL_MSR_CAPABLE;
 350                 cmd.addr.msr.reg = MSR_IA32_PERF_STATUS;
 351                 break;
 352         case SYSTEM_AMD_MSR_CAPABLE:
 353                 cmd.type = SYSTEM_AMD_MSR_CAPABLE;
 354                 cmd.addr.msr.reg = MSR_AMD_PERF_STATUS;
 355                 break;
 356         case SYSTEM_IO_CAPABLE:
 357                 cmd.type = SYSTEM_IO_CAPABLE;
 358                 perf = per_cpu(acfreq_data, cpumask_first(mask))->acpi_data;
 359                 cmd.addr.io.port = perf->control_register.address;
 360                 cmd.addr.io.bit_width = perf->control_register.bit_width;
 361                 break;
 362         default:
 363                 return 0;
 364         }
 365
 366         cmd.mask = mask;
 367         drv_read(&cmd);
 368
 369         pr_debug("get_cur_val = %u\n", cmd.val);
 370
 371         return cmd.val;
 372 }
 373
 374 static unsigned int get_cur_freq_on_cpu(unsigned int cpu)
 375 {
 376         struct acpi_cpufreq_data *data = per_cpu(acfreq_data, cpu);
 377         unsigned int freq;
 378         unsigned int cached_freq;
 379
 380         pr_debug("get_cur_freq_on_cpu (%d)\n", cpu);
 381
 382         if (unlikely(data == NULL ||
 383                      data->acpi_data == NULL || data->freq_table == NULL)) {
 384                 return 0;
 385         }
 386
 387         cached_freq = data->freq_table[data->acpi_data->state].frequency;
 388         freq = extract_freq(get_cur_val(cpumask_of(cpu)), data);
 389         if (freq != cached_freq) {
 390                 /*
 391                  * The dreaded BIOS frequency change behind our back.
 392                  * Force set the frequency on next target call.
 393                  */
 394                 data->resume = 1;
 395         }
 396
 397         pr_debug("cur freq = %u\n", freq);
 398
 399         return freq;
 400 }
 401
 402 static unsigned int check_freqs(const struct cpumask *mask, unsigned int freq,
 403                                 struct acpi_cpufreq_data *data)
 404 {
 405         unsigned int cur_freq;
 406         unsigned int i;
 407
 408         for (i = 0; i < 100; i++) {
 409                 cur_freq = extract_freq(get_cur_val(mask), data);
 410                 if (cur_freq == freq)
 411                         return 1;
 412                 udelay(10);
 413         }
 414         return 0;
 415 }
 416
 417 static int acpi_cpufreq_target(struct cpufreq_policy *policy,
 418                                unsigned int target_freq, unsigned int relation)
 419 {
 420         struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu);
 421         struct acpi_processor_performance *perf;
 422         struct cpufreq_freqs freqs;
 423         struct drv_cmd cmd;
 424         unsigned int next_state = 0; /* Index into freq_table */
 425         unsigned int next_perf_state = 0; /* Index into perf table */
 426         unsigned int i;
 427         int result = 0;
 428
 429         pr_debug("acpi_cpufreq_target %d (%d)\n", target_freq, policy->cpu);
 430
 431         if (unlikely(data == NULL ||
 432              data->acpi_data == NULL || data->freq_table == NULL)) {
 433                 return -ENODEV;
 434         }
 435
 436         perf = data->acpi_data;
 437         result = cpufreq_frequency_table_target(policy,
 438                                                 data->freq_table,
 439                                                 target_freq,
 440                                                 relation, &next_state);
 441         if (unlikely(result)) {
 442                 result = -ENODEV;
 443                 goto out;
 444         }
 445
 446         next_perf_state = data->freq_table[next_state].index;
 447         if (perf->state == next_perf_state) {
 448                 if (unlikely(data->resume)) {
 449                         pr_debug("Called after resume, resetting to P%d\n",
 450                                 next_perf_state);
 451                         data->resume = 0;
 452                 } else {
 453                         pr_debug("Already at target state (P%d)\n",
 454                                 next_perf_state);
 455                         goto out;
 456                 }
 457         }
 458
 459         switch (data->cpu_feature) {
 460         case SYSTEM_INTEL_MSR_CAPABLE:
 461                 cmd.type = SYSTEM_INTEL_MSR_CAPABLE;
 462                 cmd.addr.msr.reg = MSR_IA32_PERF_CTL;
 463                 cmd.val = (u32) perf->states[next_perf_state].control;
 464                 break;
 465         case SYSTEM_AMD_MSR_CAPABLE:
 466                 cmd.type = SYSTEM_AMD_MSR_CAPABLE;
 467                 cmd.addr.msr.reg = MSR_AMD_PERF_CTL;
 468                 cmd.val = (u32) perf->states[next_perf_state].control;
 469                 break;
 470         case SYSTEM_IO_CAPABLE:
 471                 cmd.type = SYSTEM_IO_CAPABLE;
 472                 cmd.addr.io.port = perf->control_register.address;
 473                 cmd.addr.io.bit_width = perf->control_register.bit_width;
 474                 cmd.val = (u32) perf->states[next_perf_state].control;
 475                 break;
 476         default:
 477                 result = -ENODEV;
 478                 goto out;
 479         }
 480
 481         /* cpufreq holds the hotplug lock, so we are safe from here on */
 482         if (policy->shared_type != CPUFREQ_SHARED_TYPE_ANY)
 483                 cmd.mask = policy->cpus;
 484         else
 485                 cmd.mask = cpumask_of(policy->cpu);
 486
 487         freqs.old = perf->states[perf->state].core_frequency * 1000;
 488         freqs.new = data->freq_table[next_state].frequency;
 489         for_each_cpu(i, policy->cpus) {
 490                 freqs.cpu = i;
 491                 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
 492         }
 493
 494         drv_write(&cmd);
 495
 496         if (acpi_pstate_strict) {
 497                 if (!check_freqs(cmd.mask, freqs.new, data)) {
 498                         pr_debug("acpi_cpufreq_target failed (%d)\n",
 499                                 policy->cpu);
 500                         result = -EAGAIN;
 501                         goto out;
 502                 }
 503         }
 504
 505         for_each_cpu(i, policy->cpus) {
 506                 freqs.cpu = i;
 507                 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
 508         }
 509         perf->state = next_perf_state;
 510
 511 out:
 512         return result;
 513 }
 514
 515 static int acpi_cpufreq_verify(struct cpufreq_policy *policy)
 516 {
 517         struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu);
 518
 519         pr_debug("acpi_cpufreq_verify\n");
 520
 521         return cpufreq_frequency_table_verify(policy, data->freq_table);
 522 }
 523
 524 static unsigned long
 525 acpi_cpufreq_guess_freq(struct acpi_cpufreq_data *data, unsigned int cpu)
 526 {
 527         struct acpi_processor_performance *perf = data->acpi_data;
 528
 529         if (cpu_khz) {
 530                 /* search the closest match to cpu_khz */
 531                 unsigned int i;
 532                 unsigned long freq;
 533                 unsigned long freqn = perf->states[0].core_frequency * 1000;
 534
 535                 for (i = 0; i < (perf->state_count-1); i++) {
 536                         freq = freqn;
 537                         freqn = perf->states[i+1].core_frequency * 1000;
 538                         if ((2 * cpu_khz) > (freqn + freq)) {
 539                                 perf->state = i;
 540                                 return freq;
 541                         }
 542                 }
 543                 perf->state = perf->state_count-1;
 544                 return freqn;
 545         } else {
 546                 /* assume CPU is at P0... */
 547                 perf->state = 0;
 548                 return perf->states[0].core_frequency * 1000;
 549         }
 550 }
 551
 552 static void free_acpi_perf_data(void)
 553 {
 554         unsigned int i;
 555
 556         /* Freeing a NULL pointer is OK, and alloc_percpu zeroes. */
 557         for_each_possible_cpu(i)
 558                 free_cpumask_var(per_cpu_ptr(acpi_perf_data, i)
 559                                  ->shared_cpu_map);
 560         free_percpu(acpi_perf_data);
 561 }
 562
 563 static int boost_notify(struct notifier_block *nb, unsigned long action,
 564                       void *hcpu)
 565 {
 566         unsigned cpu = (long)hcpu;
 567         const struct cpumask *cpumask;
 568
 569         cpumask = get_cpu_mask(cpu);
 570
 571         /*
 572          * Clear the boost-disable bit on the CPU_DOWN path so that
 573          * this cpu cannot block the remaining ones from boosting. On
 574          * the CPU_UP path we simply keep the boost-disable flag in
 575          * sync with the current global state.
 576          */
 577
 578         switch (action) {
 579         case CPU_UP_PREPARE:
 580         case CPU_UP_PREPARE_FROZEN:
 581                 boost_set_msrs(boost_enabled, cpumask);
 582                 break;
 583
 584         case CPU_DOWN_PREPARE:
 585         case CPU_DOWN_PREPARE_FROZEN:
 586                 boost_set_msrs(1, cpumask);
 587                 break;
 588
 589         default:
 590                 break;
 591         }
 592
 593         return NOTIFY_OK;
 594 }
 595
 596
 597 static struct notifier_block boost_nb = {
 598         .notifier_call          = boost_notify,
 599 };
 600
 601 /*
 602  * acpi_cpufreq_early_init - initialize ACPI P-States library
 603  *
 604  * Initialize the ACPI P-States library (drivers/acpi/processor_perflib.c)
 605  * in order to determine correct frequency and voltage pairings. We can
 606  * do _PDC and _PSD and find out the processor dependency for the
 607  * actual init that will happen later...
 608  */
 609 static int __init acpi_cpufreq_early_init(void)
 610 {
 611         unsigned int i;
 612         pr_debug("acpi_cpufreq_early_init\n");
 613
 614         acpi_perf_data = alloc_percpu(struct acpi_processor_performance);
 615         if (!acpi_perf_data) {
 616                 pr_debug("Memory allocation error for acpi_perf_data.\n");
 617                 return -ENOMEM;
 618         }
 619         for_each_possible_cpu(i) {
 620                 if (!zalloc_cpumask_var_node(
 621                         &per_cpu_ptr(acpi_perf_data, i)->shared_cpu_map,
 622                         GFP_KERNEL, cpu_to_node(i))) {
 623
 624                         /* Freeing a NULL pointer is OK: alloc_percpu zeroes. */
 625                         free_acpi_perf_data();
 626                         return -ENOMEM;
 627                 }
 628         }
 629
 630         /* Do initialization in ACPI core */
 631         acpi_processor_preregister_performance(acpi_perf_data);
 632         return 0;
 633 }
 634
 635 #ifdef CONFIG_SMP
 636 /*
 637  * Some BIOSes do SW_ANY coordination internally, either set it up in hw
 638  * or do it in BIOS firmware and won't inform about it to OS. If not
 639  * detected, this has a side effect of making CPU run at a different speed
 640  * than OS intended it to run at. Detect it and handle it cleanly.
 641  */
 642 static int bios_with_sw_any_bug;
 643
 644 static int sw_any_bug_found(const struct dmi_system_id *d)
 645 {
 646         bios_with_sw_any_bug = 1;
 647         return 0;
 648 }
 649
 650 static const struct dmi_system_id sw_any_bug_dmi_table[] = {
 651         {
 652                 .callback = sw_any_bug_found,
 653                 .ident = "Supermicro Server X6DLP",
 654                 .matches = {
 655                         DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
 656                         DMI_MATCH(DMI_BIOS_VERSION, "080010"),
 657                         DMI_MATCH(DMI_PRODUCT_NAME, "X6DLP"),
 658                 },
 659         },
 660         { }
 661 };
 662
 663 static int acpi_cpufreq_blacklist(struct cpuinfo_x86 *c)
 664 {
 665         /* Intel Xeon Processor 7100 Series Specification Update
 666          * http://www.intel.com/Assets/PDF/specupdate/314554.pdf
 667          * AL30: A Machine Check Exception (MCE) Occurring during an
 668          * Enhanced Intel SpeedStep Technology Ratio Change May Cause
 669          * Both Processor Cores to Lock Up. */
 670         if (c->x86_vendor == X86_VENDOR_INTEL) {
 671                 if ((c->x86 == 15) &&
 672                     (c->x86_model == 6) &&
 673                     (c->x86_mask == 8)) {
 674                         printk(KERN_INFO "acpi-cpufreq: Intel(R) "
 675                             "Xeon(R) 7100 Errata AL30, processors may "
 676                             "lock up on frequency changes: disabling "
 677                             "acpi-cpufreq.\n");
 678                         return -ENODEV;
 679                     }
 680                 }
 681         return 0;
 682 }
 683 #endif
 684
 685 static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy)
 686 {
 687         unsigned int i;
 688         unsigned int valid_states = 0;
 689         unsigned int cpu = policy->cpu;
 690         struct acpi_cpufreq_data *data;
 691         unsigned int result = 0;
 692         struct cpuinfo_x86 *c = &cpu_data(policy->cpu);
 693         struct acpi_processor_performance *perf;
 694 #ifdef CONFIG_SMP
 695         static int blacklisted;
 696 #endif
 697
 698         pr_debug("acpi_cpufreq_cpu_init\n");
 699
 700 #ifdef CONFIG_SMP
 701         if (blacklisted)
 702                 return blacklisted;
 703         blacklisted = acpi_cpufreq_blacklist(c);
 704         if (blacklisted)
 705                 return blacklisted;
 706 #endif
 707
 708         data = kzalloc(sizeof(struct acpi_cpufreq_data), GFP_KERNEL);
 709         if (!data)
 710                 return -ENOMEM;
 711
 712         data->acpi_data = per_cpu_ptr(acpi_perf_data, cpu);
 713         per_cpu(acfreq_data, cpu) = data;
 714
 715         if (cpu_has(c, X86_FEATURE_CONSTANT_TSC))
 716                 acpi_cpufreq_driver.flags |= CPUFREQ_CONST_LOOPS;
 717
 718         result = acpi_processor_register_performance(data->acpi_data, cpu);
 719         if (result)
 720                 goto err_free;
 721
 722         perf = data->acpi_data;
 723         policy->shared_type = perf->shared_type;
 724
 725         /*
 726          * Will let policy->cpus know about dependency only when software
 727          * coordination is required.
 728          */
 729         if (policy->shared_type == CPUFREQ_SHARED_TYPE_ALL ||
 730             policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) {
 731                 cpumask_copy(policy->cpus, perf->shared_cpu_map);
 732         }
 733         cpumask_copy(policy->related_cpus, perf->shared_cpu_map);
 734
 735 #ifdef CONFIG_SMP
 736         dmi_check_system(sw_any_bug_dmi_table);
 737         if (bios_with_sw_any_bug && !policy_is_shared(policy)) {
 738                 policy->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 739                 cpumask_copy(policy->cpus, cpu_core_mask(cpu));
 740         }
 741
 742         if (check_amd_hwpstate_cpu(cpu) && !acpi_pstate_strict) {
 743                 cpumask_clear(policy->cpus);
 744                 cpumask_set_cpu(cpu, policy->cpus);
 745                 cpumask_copy(policy->related_cpus, cpu_sibling_mask(cpu));
 746                 policy->shared_type = CPUFREQ_SHARED_TYPE_HW;
 747                 pr_info_once(PFX "overriding BIOS provided _PSD data\n");
 748         }
 749 #endif
 750
 751         /* capability check */
 752         if (perf->state_count <= 1) {
 753                 pr_debug("No P-States\n");
 754                 result = -ENODEV;
 755                 goto err_unreg;
 756         }
 757
 758         if (perf->control_register.space_id != perf->status_register.space_id) {
 759                 result = -ENODEV;
 760                 goto err_unreg;
 761         }
 762
 763         switch (perf->control_register.space_id) {
 764         case ACPI_ADR_SPACE_SYSTEM_IO:
 765                 if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
 766                     boot_cpu_data.x86 == 0xf) {
 767                         pr_debug("AMD K8 systems must use native drivers.\n");
 768                         result = -ENODEV;
 769                         goto err_unreg;
 770                 }
 771                 pr_debug("SYSTEM IO addr space\n");
 772                 data->cpu_feature = SYSTEM_IO_CAPABLE;
 773                 break;
 774         case ACPI_ADR_SPACE_FIXED_HARDWARE:
 775                 pr_debug("HARDWARE addr space\n");
 776                 if (check_est_cpu(cpu)) {
 777                         data->cpu_feature = SYSTEM_INTEL_MSR_CAPABLE;
 778                         break;
 779                 }
 780                 if (check_amd_hwpstate_cpu(cpu)) {
 781                         data->cpu_feature = SYSTEM_AMD_MSR_CAPABLE;
 782                         break;
 783                 }
 784                 result = -ENODEV;
 785                 goto err_unreg;
 786         default:
 787                 pr_debug("Unknown addr space %d\n",
 788                         (u32) (perf->control_register.space_id));
 789                 result = -ENODEV;
 790                 goto err_unreg;
 791         }
 792
 793         data->freq_table = kmalloc(sizeof(struct cpufreq_frequency_table) *
 794                     (perf->state_count+1), GFP_KERNEL);
 795         if (!data->freq_table) {
 796                 result = -ENOMEM;
 797                 goto err_unreg;
 798         }
 799
 800         /* detect transition latency */
 801         policy->cpuinfo.transition_latency = 0;
 802         for (i = 0; i < perf->state_count; i++) {
 803                 if ((perf->states[i].transition_latency * 1000) >
 804                     policy->cpuinfo.transition_latency)
 805                         policy->cpuinfo.transition_latency =
 806                             perf->states[i].transition_latency * 1000;
 807         }
 808
 809         /* Check for high latency (>20uS) from buggy BIOSes, like on T42 */
 810         if (perf->control_register.space_id == ACPI_ADR_SPACE_FIXED_HARDWARE &&
 811             policy->cpuinfo.transition_latency > 20 * 1000) {
 812                 policy->cpuinfo.transition_latency = 20 * 1000;
 813                 printk_once(KERN_INFO
 814                             "P-state transition latency capped at 20 uS\n");
 815         }
 816
 817         /* table init */
 818         for (i = 0; i < perf->state_count; i++) {
 819                 if (i > 0 && perf->states[i].core_frequency >=
 820                     data->freq_table[valid_states-1].frequency / 1000)
 821                         continue;
 822
 823                 data->freq_table[valid_states].index = i;
 824                 data->freq_table[valid_states].frequency =
 825                     perf->states[i].core_frequency * 1000;
 826                 valid_states++;
 827         }
 828         data->freq_table[valid_states].frequency = CPUFREQ_TABLE_END;
 829         perf->state = 0;
 830
 831         result = cpufreq_frequency_table_cpuinfo(policy, data->freq_table);
 832         if (result)
 833                 goto err_freqfree;
 834
 835         if (perf->states[0].core_frequency * 1000 != policy->cpuinfo.max_freq)
 836                 printk(KERN_WARNING FW_WARN "P-state 0 is not max freq\n");
 837
 838         switch (perf->control_register.space_id) {
 839         case ACPI_ADR_SPACE_SYSTEM_IO:
 840                 /* Current speed is unknown and not detectable by IO port */
 841                 policy->cur = acpi_cpufreq_guess_freq(data, policy->cpu);
 842                 break;
 843         case ACPI_ADR_SPACE_FIXED_HARDWARE:
 844                 acpi_cpufreq_driver.get = get_cur_freq_on_cpu;
 845                 policy->cur = get_cur_freq_on_cpu(cpu);
 846                 break;
 847         default:
 848                 break;
 849         }
 850
 851         /* notify BIOS that we exist */
 852         acpi_processor_notify_smm(THIS_MODULE);
 853
 854         /* Check for APERF/MPERF support in hardware */
 855         if (boot_cpu_has(X86_FEATURE_APERFMPERF))
 856                 acpi_cpufreq_driver.getavg = cpufreq_get_measured_perf;
 857
 858         pr_debug("CPU%u - ACPI performance management activated.\n", cpu);
 859         for (i = 0; i < perf->state_count; i++)
 860                 pr_debug("     %cP%d: %d MHz, %d mW, %d uS\n",
 861                         (i == perf->state ? '*' : ' '), i,
 862                         (u32) perf->states[i].core_frequency,
 863                         (u32) perf->states[i].power,
 864                         (u32) perf->states[i].transition_latency);
 865
 866         cpufreq_frequency_table_get_attr(data->freq_table, policy->cpu);
 867
 868         /*
 869          * the first call to ->target() should result in us actually
 870          * writing something to the appropriate registers.
 871          */
 872         data->resume = 1;
 873
 874         return result;
 875
 876 err_freqfree:
 877         kfree(data->freq_table);
 878 err_unreg:
 879         acpi_processor_unregister_performance(perf, cpu);
 880 err_free:
 881         kfree(data);
 882         per_cpu(acfreq_data, cpu) = NULL;
 883
 884         return result;
 885 }
 886
 887 static int acpi_cpufreq_cpu_exit(struct cpufreq_policy *policy)
 888 {
 889         struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu);
 890
 891         pr_debug("acpi_cpufreq_cpu_exit\n");
 892
 893         if (data) {
 894                 cpufreq_frequency_table_put_attr(policy->cpu);
 895                 per_cpu(acfreq_data, policy->cpu) = NULL;
 896                 acpi_processor_unregister_performance(data->acpi_data,
 897                                                       policy->cpu);
 898                 kfree(data->freq_table);
 899                 kfree(data);
 900         }
 901
 902         return 0;
 903 }
 904
 905 static int acpi_cpufreq_resume(struct cpufreq_policy *policy)
 906 {
 907         struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu);
 908
 909         pr_debug("acpi_cpufreq_resume\n");
 910
 911         data->resume = 1;
 912
 913         return 0;
 914 }
 915
 916 static struct freq_attr *acpi_cpufreq_attr[] = {
 917         &cpufreq_freq_attr_scaling_available_freqs,
 918         NULL,   /* this is a placeholder for cpb, do not remove */
 919         NULL,
 920 };
 921
 922 static struct cpufreq_driver acpi_cpufreq_driver = {
 923         .verify         = acpi_cpufreq_verify,
 924         .target         = acpi_cpufreq_target,
 925         .bios_limit     = acpi_processor_get_bios_limit,
 926         .init           = acpi_cpufreq_cpu_init,
 927         .exit           = acpi_cpufreq_cpu_exit,
 928         .resume         = acpi_cpufreq_resume,
 929         .name           = "acpi-cpufreq",
 930         .owner          = THIS_MODULE,
 931         .attr           = acpi_cpufreq_attr,
 932 };
 933
 934 static void __init acpi_cpufreq_boost_init(void)
 935 {
 936         if (boot_cpu_has(X86_FEATURE_CPB) || boot_cpu_has(X86_FEATURE_IDA)) {
 937                 msrs = msrs_alloc();
 938
 939                 if (!msrs)
 940                         return;
 941
 942                 boost_supported = true;
 943                 boost_enabled = boost_state(0);
 944
 945                 get_online_cpus();
 946
 947                 /* Force all MSRs to the same value */
 948                 boost_set_msrs(boost_enabled, cpu_online_mask);
 949
 950                 register_cpu_notifier(&boost_nb);
 951
 952                 put_online_cpus();
 953         } else
 954                 global_boost.attr.mode = 0444;
 955
 956         /* We create the boost file in any case, though for systems without
 957          * hardware support it will be read-only and hardwired to return 0.
 958          */
 959         if (sysfs_create_file(cpufreq_global_kobject, &(global_boost.attr)))
 960                 pr_warn(PFX "could not register global boost sysfs file\n");
 961         else
 962                 pr_debug("registered global boost sysfs file\n");
 963 }
 964
 965 static void __exit acpi_cpufreq_boost_exit(void)
 966 {
 967         sysfs_remove_file(cpufreq_global_kobject, &(global_boost.attr));
 968
 969         if (msrs) {
 970                 unregister_cpu_notifier(&boost_nb);
 971
 972                 msrs_free(msrs);
 973                 msrs = NULL;
 974         }
 975 }
 976
 977 static int __init acpi_cpufreq_init(void)
 978 {
 979         int ret;
 980
 981         if (acpi_disabled)
 982                 return 0;
 983
 984         pr_debug("acpi_cpufreq_init\n");
 985
 986         ret = acpi_cpufreq_early_init();
 987         if (ret)
 988                 return ret;
 989
 990 #ifdef CONFIG_X86_ACPI_CPUFREQ_CPB
 991         /* this is a sysfs file with a strange name and an even stranger
 992          * semantic - per CPU instantiation, but system global effect.
 993          * Lets enable it only on AMD CPUs for compatibility reasons and
 994          * only if configured. This is considered legacy code, which
 995          * will probably be removed at some point in the future.
 996          */
 997         if (check_amd_hwpstate_cpu(0)) {
 998                 struct freq_attr **iter;
 999
1000                 pr_debug("adding sysfs entry for cpb\n");
1001
1002                 for (iter = acpi_cpufreq_attr; *iter != NULL; iter++)
1003                         ;
1004
1005                 /* make sure there is a terminator behind it */
1006                 if (iter[1] == NULL)
1007                         *iter = &cpb;
1008         }
1009 #endif
1010
1011         ret = cpufreq_register_driver(&acpi_cpufreq_driver);
1012         if (ret)
1013                 free_acpi_perf_data();
1014         else
1015                 acpi_cpufreq_boost_init();
1016
1017         return ret;
1018 }
1019
1020 static void __exit acpi_cpufreq_exit(void)
1021 {
1022         pr_debug("acpi_cpufreq_exit\n");
1023
1024         acpi_cpufreq_boost_exit();
1025
1026         cpufreq_unregister_driver(&acpi_cpufreq_driver);
1027
1028         free_acpi_perf_data();
1029 }
1030
1031 module_param(acpi_pstate_strict, uint, 0644);
1032 MODULE_PARM_DESC(acpi_pstate_strict,
1033         "value 0 or non-zero. non-zero -> strict ACPI checks are "
1034         "performed during frequency changes.");
1035
1036 late_initcall(acpi_cpufreq_init);
1037 module_exit(acpi_cpufreq_exit);
1038
1039 static const struct x86_cpu_id acpi_cpufreq_ids[] = {
1040         X86_FEATURE_MATCH(X86_FEATURE_ACPI),
1041         X86_FEATURE_MATCH(X86_FEATURE_HW_PSTATE),
1042         {}
1043 };
1044 MODULE_DEVICE_TABLE(x86cpu, acpi_cpufreq_ids);
1045
1046 MODULE_ALIAS("acpi");