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         cpumask_var_t freqdomain_cpus;
  74 };
  75
  76 static DEFINE_PER_CPU(struct acpi_cpufreq_data *, acfreq_data);
  77
  78 /* acpi_perf_data is a pointer to percpu data. */
  79 static struct acpi_processor_performance __percpu *acpi_perf_data;
  80
  81 static struct cpufreq_driver acpi_cpufreq_driver;
  82
  83 static unsigned int acpi_pstate_strict;
  84 static bool boost_enabled, boost_supported;
  85 static struct msr __percpu *msrs;
  86
  87 static bool boost_state(unsigned int cpu)
  88 {
  89         u32 lo, hi;
  90         u64 msr;
  91
  92         switch (boot_cpu_data.x86_vendor) {
  93         case X86_VENDOR_INTEL:
  94                 rdmsr_on_cpu(cpu, MSR_IA32_MISC_ENABLE, &lo, &hi);
  95                 msr = lo | ((u64)hi << 32);
  96                 return !(msr & MSR_IA32_MISC_ENABLE_TURBO_DISABLE);
  97         case X86_VENDOR_AMD:
  98                 rdmsr_on_cpu(cpu, MSR_K7_HWCR, &lo, &hi);
  99                 msr = lo | ((u64)hi << 32);
 100                 return !(msr & MSR_K7_HWCR_CPB_DIS);
 101         }
 102         return false;
 103 }
 104
 105 static void boost_set_msrs(bool enable, const struct cpumask *cpumask)
 106 {
 107         u32 cpu;
 108         u32 msr_addr;
 109         u64 msr_mask;
 110
 111         switch (boot_cpu_data.x86_vendor) {
 112         case X86_VENDOR_INTEL:
 113                 msr_addr = MSR_IA32_MISC_ENABLE;
 114                 msr_mask = MSR_IA32_MISC_ENABLE_TURBO_DISABLE;
 115                 break;
 116         case X86_VENDOR_AMD:
 117                 msr_addr = MSR_K7_HWCR;
 118                 msr_mask = MSR_K7_HWCR_CPB_DIS;
 119                 break;
 120         default:
 121                 return;
 122         }
 123
 124         rdmsr_on_cpus(cpumask, msr_addr, msrs);
 125
 126         for_each_cpu(cpu, cpumask) {
 127                 struct msr *reg = per_cpu_ptr(msrs, cpu);
 128                 if (enable)
 129                         reg->q &= ~msr_mask;
 130                 else
 131                         reg->q |= msr_mask;
 132         }
 133
 134         wrmsr_on_cpus(cpumask, msr_addr, msrs);
 135 }
 136
 137 static ssize_t _store_boost(const char *buf, size_t count)
 138 {
 139         int ret;
 140         unsigned long val = 0;
 141
 142         if (!boost_supported)
 143                 return -EINVAL;
 144
 145         ret = kstrtoul(buf, 10, &val);
 146         if (ret || (val > 1))
 147                 return -EINVAL;
 148
 149         if ((val && boost_enabled) || (!val && !boost_enabled))
 150                 return count;
 151
 152         get_online_cpus();
 153
 154         boost_set_msrs(val, cpu_online_mask);
 155
 156         put_online_cpus();
 157
 158         boost_enabled = val;
 159         pr_debug("Core Boosting %sabled.\n", val ? "en" : "dis");
 160
 161         return count;
 162 }
 163
 164 static ssize_t store_global_boost(struct kobject *kobj, struct attribute *attr,
 165                                   const char *buf, size_t count)
 166 {
 167         return _store_boost(buf, count);
 168 }
 169
 170 static ssize_t show_global_boost(struct kobject *kobj,
 171                                  struct attribute *attr, char *buf)
 172 {
 173         return sprintf(buf, "%u\n", boost_enabled);
 174 }
 175
 176 static struct global_attr global_boost = __ATTR(boost, 0644,
 177                                                 show_global_boost,
 178                                                 store_global_boost);
 179
 180 static ssize_t show_freqdomain_cpus(struct cpufreq_policy *policy, char *buf)
 181 {
 182         struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu);
 183
 184         return cpufreq_show_cpus(data->freqdomain_cpus, buf);
 185 }
 186
 187 cpufreq_freq_attr_ro(freqdomain_cpus);
 188
 189 #ifdef CONFIG_X86_ACPI_CPUFREQ_CPB
 190 static ssize_t store_cpb(struct cpufreq_policy *policy, const char *buf,
 191                          size_t count)
 192 {
 193         return _store_boost(buf, count);
 194 }
 195
 196 static ssize_t show_cpb(struct cpufreq_policy *policy, char *buf)
 197 {
 198         return sprintf(buf, "%u\n", boost_enabled);
 199 }
 200
 201 static struct freq_attr cpb = __ATTR(cpb, 0644, show_cpb, store_cpb);
 202 #endif
 203
 204 static int check_est_cpu(unsigned int cpuid)
 205 {
 206         struct cpuinfo_x86 *cpu = &cpu_data(cpuid);
 207
 208         return cpu_has(cpu, X86_FEATURE_EST);
 209 }
 210
 211 static int check_amd_hwpstate_cpu(unsigned int cpuid)
 212 {
 213         struct cpuinfo_x86 *cpu = &cpu_data(cpuid);
 214
 215         return cpu_has(cpu, X86_FEATURE_HW_PSTATE);
 216 }
 217
 218 static unsigned extract_io(u32 value, struct acpi_cpufreq_data *data)
 219 {
 220         struct acpi_processor_performance *perf;
 221         int i;
 222
 223         perf = data->acpi_data;
 224
 225         for (i = 0; i < perf->state_count; i++) {
 226                 if (value == perf->states[i].status)
 227                         return data->freq_table[i].frequency;
 228         }
 229         return 0;
 230 }
 231
 232 static unsigned extract_msr(u32 msr, struct acpi_cpufreq_data *data)
 233 {
 234         int i;
 235         struct acpi_processor_performance *perf;
 236
 237         if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
 238                 msr &= AMD_MSR_RANGE;
 239         else
 240                 msr &= INTEL_MSR_RANGE;
 241
 242         perf = data->acpi_data;
 243
 244         for (i = 0; data->freq_table[i].frequency != CPUFREQ_TABLE_END; i++) {
 245                 if (msr == perf->states[data->freq_table[i].driver_data].status)
 246                         return data->freq_table[i].frequency;
 247         }
 248         return data->freq_table[0].frequency;
 249 }
 250
 251 static unsigned extract_freq(u32 val, struct acpi_cpufreq_data *data)
 252 {
 253         switch (data->cpu_feature) {
 254         case SYSTEM_INTEL_MSR_CAPABLE:
 255         case SYSTEM_AMD_MSR_CAPABLE:
 256                 return extract_msr(val, data);
 257         case SYSTEM_IO_CAPABLE:
 258                 return extract_io(val, data);
 259         default:
 260                 return 0;
 261         }
 262 }
 263
 264 struct msr_addr {
 265         u32 reg;
 266 };
 267
 268 struct io_addr {
 269         u16 port;
 270         u8 bit_width;
 271 };
 272
 273 struct drv_cmd {
 274         unsigned int type;
 275         const struct cpumask *mask;
 276         union {
 277                 struct msr_addr msr;
 278                 struct io_addr io;
 279         } addr;
 280         u32 val;
 281 };
 282
 283 /* Called via smp_call_function_single(), on the target CPU */
 284 static void do_drv_read(void *_cmd)
 285 {
 286         struct drv_cmd *cmd = _cmd;
 287         u32 h;
 288
 289         switch (cmd->type) {
 290         case SYSTEM_INTEL_MSR_CAPABLE:
 291         case SYSTEM_AMD_MSR_CAPABLE:
 292                 rdmsr(cmd->addr.msr.reg, cmd->val, h);
 293                 break;
 294         case SYSTEM_IO_CAPABLE:
 295                 acpi_os_read_port((acpi_io_address)cmd->addr.io.port,
 296                                 &cmd->val,
 297                                 (u32)cmd->addr.io.bit_width);
 298                 break;
 299         default:
 300                 break;
 301         }
 302 }
 303
 304 /* Called via smp_call_function_many(), on the target CPUs */
 305 static void do_drv_write(void *_cmd)
 306 {
 307         struct drv_cmd *cmd = _cmd;
 308         u32 lo, hi;
 309
 310         switch (cmd->type) {
 311         case SYSTEM_INTEL_MSR_CAPABLE:
 312                 rdmsr(cmd->addr.msr.reg, lo, hi);
 313                 lo = (lo & ~INTEL_MSR_RANGE) | (cmd->val & INTEL_MSR_RANGE);
 314                 wrmsr(cmd->addr.msr.reg, lo, hi);
 315                 break;
 316         case SYSTEM_AMD_MSR_CAPABLE:
 317                 wrmsr(cmd->addr.msr.reg, cmd->val, 0);
 318                 break;
 319         case SYSTEM_IO_CAPABLE:
 320                 acpi_os_write_port((acpi_io_address)cmd->addr.io.port,
 321                                 cmd->val,
 322                                 (u32)cmd->addr.io.bit_width);
 323                 break;
 324         default:
 325                 break;
 326         }
 327 }
 328
 329 static void drv_read(struct drv_cmd *cmd)
 330 {
 331         int err;
 332         cmd->val = 0;
 333
 334         err = smp_call_function_any(cmd->mask, do_drv_read, cmd, 1);
 335         WARN_ON_ONCE(err);      /* smp_call_function_any() was buggy? */
 336 }
 337
 338 static void drv_write(struct drv_cmd *cmd)
 339 {
 340         int this_cpu;
 341
 342         this_cpu = get_cpu();
 343         if (cpumask_test_cpu(this_cpu, cmd->mask))
 344                 do_drv_write(cmd);
 345         smp_call_function_many(cmd->mask, do_drv_write, cmd, 1);
 346         put_cpu();
 347 }
 348
 349 static u32 get_cur_val(const struct cpumask *mask)
 350 {
 351         struct acpi_processor_performance *perf;
 352         struct drv_cmd cmd;
 353
 354         if (unlikely(cpumask_empty(mask)))
 355                 return 0;
 356
 357         switch (per_cpu(acfreq_data, cpumask_first(mask))->cpu_feature) {
 358         case SYSTEM_INTEL_MSR_CAPABLE:
 359                 cmd.type = SYSTEM_INTEL_MSR_CAPABLE;
 360                 cmd.addr.msr.reg = MSR_IA32_PERF_CTL;
 361                 break;
 362         case SYSTEM_AMD_MSR_CAPABLE:
 363                 cmd.type = SYSTEM_AMD_MSR_CAPABLE;
 364                 cmd.addr.msr.reg = MSR_AMD_PERF_CTL;
 365                 break;
 366         case SYSTEM_IO_CAPABLE:
 367                 cmd.type = SYSTEM_IO_CAPABLE;
 368                 perf = per_cpu(acfreq_data, cpumask_first(mask))->acpi_data;
 369                 cmd.addr.io.port = perf->control_register.address;
 370                 cmd.addr.io.bit_width = perf->control_register.bit_width;
 371                 break;
 372         default:
 373                 return 0;
 374         }
 375
 376         cmd.mask = mask;
 377         drv_read(&cmd);
 378
 379         pr_debug("get_cur_val = %u\n", cmd.val);
 380
 381         return cmd.val;
 382 }
 383
 384 static unsigned int get_cur_freq_on_cpu(unsigned int cpu)
 385 {
 386         struct acpi_cpufreq_data *data = per_cpu(acfreq_data, cpu);
 387         unsigned int freq;
 388         unsigned int cached_freq;
 389
 390         pr_debug("get_cur_freq_on_cpu (%d)\n", cpu);
 391
 392         if (unlikely(data == NULL ||
 393                      data->acpi_data == NULL || data->freq_table == NULL)) {
 394                 return 0;
 395         }
 396
 397         cached_freq = data->freq_table[data->acpi_data->state].frequency;
 398         freq = extract_freq(get_cur_val(cpumask_of(cpu)), data);
 399         if (freq != cached_freq) {
 400                 /*
 401                  * The dreaded BIOS frequency change behind our back.
 402                  * Force set the frequency on next target call.
 403                  */
 404                 data->resume = 1;
 405         }
 406
 407         pr_debug("cur freq = %u\n", freq);
 408
 409         return freq;
 410 }
 411
 412 static unsigned int check_freqs(const struct cpumask *mask, unsigned int freq,
 413                                 struct acpi_cpufreq_data *data)
 414 {
 415         unsigned int cur_freq;
 416         unsigned int i;
 417
 418         for (i = 0; i < 100; i++) {
 419                 cur_freq = extract_freq(get_cur_val(mask), data);
 420                 if (cur_freq == freq)
 421                         return 1;
 422                 udelay(10);
 423         }
 424         return 0;
 425 }
 426
 427 static int acpi_cpufreq_target(struct cpufreq_policy *policy,
 428                                unsigned int target_freq, unsigned int relation)
 429 {
 430         struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu);
 431         struct acpi_processor_performance *perf;
 432         struct cpufreq_freqs freqs;
 433         struct drv_cmd cmd;
 434         unsigned int next_state = 0; /* Index into freq_table */
 435         unsigned int next_perf_state = 0; /* Index into perf table */
 436         int result = 0;
 437
 438         pr_debug("acpi_cpufreq_target %d (%d)\n", target_freq, policy->cpu);
 439
 440         if (unlikely(data == NULL ||
 441              data->acpi_data == NULL || data->freq_table == NULL)) {
 442                 return -ENODEV;
 443         }
 444
 445         perf = data->acpi_data;
 446         result = cpufreq_frequency_table_target(policy,
 447                                                 data->freq_table,
 448                                                 target_freq,
 449                                                 relation, &next_state);
 450         if (unlikely(result)) {
 451                 result = -ENODEV;
 452                 goto out;
 453         }
 454
 455         next_perf_state = data->freq_table[next_state].driver_data;
 456         if (perf->state == next_perf_state) {
 457                 if (unlikely(data->resume)) {
 458                         pr_debug("Called after resume, resetting to P%d\n",
 459                                 next_perf_state);
 460                         data->resume = 0;
 461                 } else {
 462                         pr_debug("Already at target state (P%d)\n",
 463                                 next_perf_state);
 464                         goto out;
 465                 }
 466         }
 467
 468         switch (data->cpu_feature) {
 469         case SYSTEM_INTEL_MSR_CAPABLE:
 470                 cmd.type = SYSTEM_INTEL_MSR_CAPABLE;
 471                 cmd.addr.msr.reg = MSR_IA32_PERF_CTL;
 472                 cmd.val = (u32) perf->states[next_perf_state].control;
 473                 break;
 474         case SYSTEM_AMD_MSR_CAPABLE:
 475                 cmd.type = SYSTEM_AMD_MSR_CAPABLE;
 476                 cmd.addr.msr.reg = MSR_AMD_PERF_CTL;
 477                 cmd.val = (u32) perf->states[next_perf_state].control;
 478                 break;
 479         case SYSTEM_IO_CAPABLE:
 480                 cmd.type = SYSTEM_IO_CAPABLE;
 481                 cmd.addr.io.port = perf->control_register.address;
 482                 cmd.addr.io.bit_width = perf->control_register.bit_width;
 483                 cmd.val = (u32) perf->states[next_perf_state].control;
 484                 break;
 485         default:
 486                 result = -ENODEV;
 487                 goto out;
 488         }
 489
 490         /* cpufreq holds the hotplug lock, so we are safe from here on */
 491         if (policy->shared_type != CPUFREQ_SHARED_TYPE_ANY)
 492                 cmd.mask = policy->cpus;
 493         else
 494                 cmd.mask = cpumask_of(policy->cpu);
 495
 496         freqs.old = perf->states[perf->state].core_frequency * 1000;
 497         freqs.new = data->freq_table[next_state].frequency;
 498         cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
 499
 500         drv_write(&cmd);
 501
 502         if (acpi_pstate_strict) {
 503                 if (!check_freqs(cmd.mask, freqs.new, data)) {
 504                         pr_debug("acpi_cpufreq_target failed (%d)\n",
 505                                 policy->cpu);
 506                         result = -EAGAIN;
 507                         freqs.new = freqs.old;
 508                 }
 509         }
 510
 511         cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
 512
 513         if (!result)
 514                 perf->state = next_perf_state;
 515
 516 out:
 517         return result;
 518 }
 519
 520 static int acpi_cpufreq_verify(struct cpufreq_policy *policy)
 521 {
 522         struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu);
 523
 524         pr_debug("acpi_cpufreq_verify\n");
 525
 526         return cpufreq_frequency_table_verify(policy, data->freq_table);
 527 }
 528
 529 static unsigned long
 530 acpi_cpufreq_guess_freq(struct acpi_cpufreq_data *data, unsigned int cpu)
 531 {
 532         struct acpi_processor_performance *perf = data->acpi_data;
 533
 534         if (cpu_khz) {
 535                 /* search the closest match to cpu_khz */
 536                 unsigned int i;
 537                 unsigned long freq;
 538                 unsigned long freqn = perf->states[0].core_frequency * 1000;
 539
 540                 for (i = 0; i < (perf->state_count-1); i++) {
 541                         freq = freqn;
 542                         freqn = perf->states[i+1].core_frequency * 1000;
 543                         if ((2 * cpu_khz) > (freqn + freq)) {
 544                                 perf->state = i;
 545                                 return freq;
 546                         }
 547                 }
 548                 perf->state = perf->state_count-1;
 549                 return freqn;
 550         } else {
 551                 /* assume CPU is at P0... */
 552                 perf->state = 0;
 553                 return perf->states[0].core_frequency * 1000;
 554         }
 555 }
 556
 557 static void free_acpi_perf_data(void)
 558 {
 559         unsigned int i;
 560
 561         /* Freeing a NULL pointer is OK, and alloc_percpu zeroes. */
 562         for_each_possible_cpu(i)
 563                 free_cpumask_var(per_cpu_ptr(acpi_perf_data, i)
 564                                  ->shared_cpu_map);
 565         free_percpu(acpi_perf_data);
 566 }
 567
 568 static int boost_notify(struct notifier_block *nb, unsigned long action,
 569                       void *hcpu)
 570 {
 571         unsigned cpu = (long)hcpu;
 572         const struct cpumask *cpumask;
 573
 574         cpumask = get_cpu_mask(cpu);
 575
 576         /*
 577          * Clear the boost-disable bit on the CPU_DOWN path so that
 578          * this cpu cannot block the remaining ones from boosting. On
 579          * the CPU_UP path we simply keep the boost-disable flag in
 580          * sync with the current global state.
 581          */
 582
 583         switch (action) {
 584         case CPU_UP_PREPARE:
 585         case CPU_UP_PREPARE_FROZEN:
 586                 boost_set_msrs(boost_enabled, cpumask);
 587                 break;
 588
 589         case CPU_DOWN_PREPARE:
 590         case CPU_DOWN_PREPARE_FROZEN:
 591                 boost_set_msrs(1, cpumask);
 592                 break;
 593
 594         default:
 595                 break;
 596         }
 597
 598         return NOTIFY_OK;
 599 }
 600
 601
 602 static struct notifier_block boost_nb = {
 603         .notifier_call          = boost_notify,
 604 };
 605
 606 /*
 607  * acpi_cpufreq_early_init - initialize ACPI P-States library
 608  *
 609  * Initialize the ACPI P-States library (drivers/acpi/processor_perflib.c)
 610  * in order to determine correct frequency and voltage pairings. We can
 611  * do _PDC and _PSD and find out the processor dependency for the
 612  * actual init that will happen later...
 613  */
 614 static int __init acpi_cpufreq_early_init(void)
 615 {
 616         unsigned int i;
 617         pr_debug("acpi_cpufreq_early_init\n");
 618
 619         acpi_perf_data = alloc_percpu(struct acpi_processor_performance);
 620         if (!acpi_perf_data) {
 621                 pr_debug("Memory allocation error for acpi_perf_data.\n");
 622                 return -ENOMEM;
 623         }
 624         for_each_possible_cpu(i) {
 625                 if (!zalloc_cpumask_var_node(
 626                         &per_cpu_ptr(acpi_perf_data, i)->shared_cpu_map,
 627                         GFP_KERNEL, cpu_to_node(i))) {
 628
 629                         /* Freeing a NULL pointer is OK: alloc_percpu zeroes. */
 630                         free_acpi_perf_data();
 631                         return -ENOMEM;
 632                 }
 633         }
 634
 635         /* Do initialization in ACPI core */
 636         acpi_processor_preregister_performance(acpi_perf_data);
 637         return 0;
 638 }
 639
 640 #ifdef CONFIG_SMP
 641 /*
 642  * Some BIOSes do SW_ANY coordination internally, either set it up in hw
 643  * or do it in BIOS firmware and won't inform about it to OS. If not
 644  * detected, this has a side effect of making CPU run at a different speed
 645  * than OS intended it to run at. Detect it and handle it cleanly.
 646  */
 647 static int bios_with_sw_any_bug;
 648
 649 static int sw_any_bug_found(const struct dmi_system_id *d)
 650 {
 651         bios_with_sw_any_bug = 1;
 652         return 0;
 653 }
 654
 655 static const struct dmi_system_id sw_any_bug_dmi_table[] = {
 656         {
 657                 .callback = sw_any_bug_found,
 658                 .ident = "Supermicro Server X6DLP",
 659                 .matches = {
 660                         DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
 661                         DMI_MATCH(DMI_BIOS_VERSION, "080010"),
 662                         DMI_MATCH(DMI_PRODUCT_NAME, "X6DLP"),
 663                 },
 664         },
 665         { }
 666 };
 667
 668 static int acpi_cpufreq_blacklist(struct cpuinfo_x86 *c)
 669 {
 670         /* Intel Xeon Processor 7100 Series Specification Update
 671          * http://www.intel.com/Assets/PDF/specupdate/314554.pdf
 672          * AL30: A Machine Check Exception (MCE) Occurring during an
 673          * Enhanced Intel SpeedStep Technology Ratio Change May Cause
 674          * Both Processor Cores to Lock Up. */
 675         if (c->x86_vendor == X86_VENDOR_INTEL) {
 676                 if ((c->x86 == 15) &&
 677                     (c->x86_model == 6) &&
 678                     (c->x86_mask == 8)) {
 679                         printk(KERN_INFO "acpi-cpufreq: Intel(R) "
 680                             "Xeon(R) 7100 Errata AL30, processors may "
 681                             "lock up on frequency changes: disabling "
 682                             "acpi-cpufreq.\n");
 683                         return -ENODEV;
 684                     }
 685                 }
 686         return 0;
 687 }
 688 #endif
 689
 690 static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy)
 691 {
 692         unsigned int i;
 693         unsigned int valid_states = 0;
 694         unsigned int cpu = policy->cpu;
 695         struct acpi_cpufreq_data *data;
 696         unsigned int result = 0;
 697         struct cpuinfo_x86 *c = &cpu_data(policy->cpu);
 698         struct acpi_processor_performance *perf;
 699 #ifdef CONFIG_SMP
 700         static int blacklisted;
 701 #endif
 702
 703         pr_debug("acpi_cpufreq_cpu_init\n");
 704
 705 #ifdef CONFIG_SMP
 706         if (blacklisted)
 707                 return blacklisted;
 708         blacklisted = acpi_cpufreq_blacklist(c);
 709         if (blacklisted)
 710                 return blacklisted;
 711 #endif
 712
 713         data = kzalloc(sizeof(struct acpi_cpufreq_data), GFP_KERNEL);
 714         if (!data)
 715                 return -ENOMEM;
 716
 717         if (!zalloc_cpumask_var(&data->freqdomain_cpus, GFP_KERNEL)) {
 718                 result = -ENOMEM;
 719                 goto err_free;
 720         }
 721
 722         data->acpi_data = per_cpu_ptr(acpi_perf_data, cpu);
 723         per_cpu(acfreq_data, cpu) = data;
 724
 725         if (cpu_has(c, X86_FEATURE_CONSTANT_TSC))
 726                 acpi_cpufreq_driver.flags |= CPUFREQ_CONST_LOOPS;
 727
 728         result = acpi_processor_register_performance(data->acpi_data, cpu);
 729         if (result)
 730                 goto err_free_mask;
 731
 732         perf = data->acpi_data;
 733         policy->shared_type = perf->shared_type;
 734
 735         /*
 736          * Will let policy->cpus know about dependency only when software
 737          * coordination is required.
 738          */
 739         if (policy->shared_type == CPUFREQ_SHARED_TYPE_ALL ||
 740             policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) {
 741                 cpumask_copy(policy->cpus, perf->shared_cpu_map);
 742         }
 743         cpumask_copy(data->freqdomain_cpus, perf->shared_cpu_map);
 744
 745 #ifdef CONFIG_SMP
 746         dmi_check_system(sw_any_bug_dmi_table);
 747         if (bios_with_sw_any_bug && !policy_is_shared(policy)) {
 748                 policy->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 749                 cpumask_copy(policy->cpus, cpu_core_mask(cpu));
 750         }
 751
 752         if (check_amd_hwpstate_cpu(cpu) && !acpi_pstate_strict) {
 753                 cpumask_clear(policy->cpus);
 754                 cpumask_set_cpu(cpu, policy->cpus);
 755                 cpumask_copy(data->freqdomain_cpus, cpu_sibling_mask(cpu));
 756                 policy->shared_type = CPUFREQ_SHARED_TYPE_HW;
 757                 pr_info_once(PFX "overriding BIOS provided _PSD data\n");
 758         }
 759 #endif
 760
 761         /* capability check */
 762         if (perf->state_count <= 1) {
 763                 pr_debug("No P-States\n");
 764                 result = -ENODEV;
 765                 goto err_unreg;
 766         }
 767
 768         if (perf->control_register.space_id != perf->status_register.space_id) {
 769                 result = -ENODEV;
 770                 goto err_unreg;
 771         }
 772
 773         switch (perf->control_register.space_id) {
 774         case ACPI_ADR_SPACE_SYSTEM_IO:
 775                 if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
 776                     boot_cpu_data.x86 == 0xf) {
 777                         pr_debug("AMD K8 systems must use native drivers.\n");
 778                         result = -ENODEV;
 779                         goto err_unreg;
 780                 }
 781                 pr_debug("SYSTEM IO addr space\n");
 782                 data->cpu_feature = SYSTEM_IO_CAPABLE;
 783                 break;
 784         case ACPI_ADR_SPACE_FIXED_HARDWARE:
 785                 pr_debug("HARDWARE addr space\n");
 786                 if (check_est_cpu(cpu)) {
 787                         data->cpu_feature = SYSTEM_INTEL_MSR_CAPABLE;
 788                         break;
 789                 }
 790                 if (check_amd_hwpstate_cpu(cpu)) {
 791                         data->cpu_feature = SYSTEM_AMD_MSR_CAPABLE;
 792                         break;
 793                 }
 794                 result = -ENODEV;
 795                 goto err_unreg;
 796         default:
 797                 pr_debug("Unknown addr space %d\n",
 798                         (u32) (perf->control_register.space_id));
 799                 result = -ENODEV;
 800                 goto err_unreg;
 801         }
 802
 803         data->freq_table = kmalloc(sizeof(struct cpufreq_frequency_table) *
 804                     (perf->state_count+1), GFP_KERNEL);
 805         if (!data->freq_table) {
 806                 result = -ENOMEM;
 807                 goto err_unreg;
 808         }
 809
 810         /* detect transition latency */
 811         policy->cpuinfo.transition_latency = 0;
 812         for (i = 0; i < perf->state_count; i++) {
 813                 if ((perf->states[i].transition_latency * 1000) >
 814                     policy->cpuinfo.transition_latency)
 815                         policy->cpuinfo.transition_latency =
 816                             perf->states[i].transition_latency * 1000;
 817         }
 818
 819         /* Check for high latency (>20uS) from buggy BIOSes, like on T42 */
 820         if (perf->control_register.space_id == ACPI_ADR_SPACE_FIXED_HARDWARE &&
 821             policy->cpuinfo.transition_latency > 20 * 1000) {
 822                 policy->cpuinfo.transition_latency = 20 * 1000;
 823                 printk_once(KERN_INFO
 824                             "P-state transition latency capped at 20 uS\n");
 825         }
 826
 827         /* table init */
 828         for (i = 0; i < perf->state_count; i++) {
 829                 if (i > 0 && perf->states[i].core_frequency >=
 830                     data->freq_table[valid_states-1].frequency / 1000)
 831                         continue;
 832
 833                 data->freq_table[valid_states].driver_data = i;
 834                 data->freq_table[valid_states].frequency =
 835                     perf->states[i].core_frequency * 1000;
 836                 valid_states++;
 837         }
 838         data->freq_table[valid_states].frequency = CPUFREQ_TABLE_END;
 839         perf->state = 0;
 840
 841         result = cpufreq_frequency_table_cpuinfo(policy, data->freq_table);
 842         if (result)
 843                 goto err_freqfree;
 844
 845         if (perf->states[0].core_frequency * 1000 != policy->cpuinfo.max_freq)
 846                 printk(KERN_WARNING FW_WARN "P-state 0 is not max freq\n");
 847
 848         switch (perf->control_register.space_id) {
 849         case ACPI_ADR_SPACE_SYSTEM_IO:
 850                 /* Current speed is unknown and not detectable by IO port */
 851                 policy->cur = acpi_cpufreq_guess_freq(data, policy->cpu);
 852                 break;
 853         case ACPI_ADR_SPACE_FIXED_HARDWARE:
 854                 acpi_cpufreq_driver.get = get_cur_freq_on_cpu;
 855                 policy->cur = get_cur_freq_on_cpu(cpu);
 856                 break;
 857         default:
 858                 break;
 859         }
 860
 861         /* notify BIOS that we exist */
 862         acpi_processor_notify_smm(THIS_MODULE);
 863
 864         /* Check for APERF/MPERF support in hardware */
 865         if (boot_cpu_has(X86_FEATURE_APERFMPERF))
 866                 acpi_cpufreq_driver.getavg = cpufreq_get_measured_perf;
 867
 868         pr_debug("CPU%u - ACPI performance management activated.\n", cpu);
 869         for (i = 0; i < perf->state_count; i++)
 870                 pr_debug("     %cP%d: %d MHz, %d mW, %d uS\n",
 871                         (i == perf->state ? '*' : ' '), i,
 872                         (u32) perf->states[i].core_frequency,
 873                         (u32) perf->states[i].power,
 874                         (u32) perf->states[i].transition_latency);
 875
 876         cpufreq_frequency_table_get_attr(data->freq_table, policy->cpu);
 877
 878         /*
 879          * the first call to ->target() should result in us actually
 880          * writing something to the appropriate registers.
 881          */
 882         data->resume = 1;
 883
 884         return result;
 885
 886 err_freqfree:
 887         kfree(data->freq_table);
 888 err_unreg:
 889         acpi_processor_unregister_performance(perf, cpu);
 890 err_free_mask:
 891         free_cpumask_var(data->freqdomain_cpus);
 892 err_free:
 893         kfree(data);
 894         per_cpu(acfreq_data, cpu) = NULL;
 895
 896         return result;
 897 }
 898
 899 static int acpi_cpufreq_cpu_exit(struct cpufreq_policy *policy)
 900 {
 901         struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu);
 902
 903         pr_debug("acpi_cpufreq_cpu_exit\n");
 904
 905         if (data) {
 906                 cpufreq_frequency_table_put_attr(policy->cpu);
 907                 per_cpu(acfreq_data, policy->cpu) = NULL;
 908                 acpi_processor_unregister_performance(data->acpi_data,
 909                                                       policy->cpu);
 910                 free_cpumask_var(data->freqdomain_cpus);
 911                 kfree(data->freq_table);
 912                 kfree(data);
 913         }
 914
 915         return 0;
 916 }
 917
 918 static int acpi_cpufreq_resume(struct cpufreq_policy *policy)
 919 {
 920         struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu);
 921
 922         pr_debug("acpi_cpufreq_resume\n");
 923
 924         data->resume = 1;
 925
 926         return 0;
 927 }
 928
 929 static struct freq_attr *acpi_cpufreq_attr[] = {
 930         &cpufreq_freq_attr_scaling_available_freqs,
 931         &freqdomain_cpus,
 932         NULL,   /* this is a placeholder for cpb, do not remove */
 933         NULL,
 934 };
 935
 936 static struct cpufreq_driver acpi_cpufreq_driver = {
 937         .verify         = acpi_cpufreq_verify,
 938         .target         = acpi_cpufreq_target,
 939         .bios_limit     = acpi_processor_get_bios_limit,
 940         .init           = acpi_cpufreq_cpu_init,
 941         .exit           = acpi_cpufreq_cpu_exit,
 942         .resume         = acpi_cpufreq_resume,
 943         .name           = "acpi-cpufreq",
 944         .owner          = THIS_MODULE,
 945         .attr           = acpi_cpufreq_attr,
 946 };
 947
 948 static void __init acpi_cpufreq_boost_init(void)
 949 {
 950         if (boot_cpu_has(X86_FEATURE_CPB) || boot_cpu_has(X86_FEATURE_IDA)) {
 951                 msrs = msrs_alloc();
 952
 953                 if (!msrs)
 954                         return;
 955
 956                 boost_supported = true;
 957                 boost_enabled = boost_state(0);
 958
 959                 get_online_cpus();
 960
 961                 /* Force all MSRs to the same value */
 962                 boost_set_msrs(boost_enabled, cpu_online_mask);
 963
 964                 register_cpu_notifier(&boost_nb);
 965
 966                 put_online_cpus();
 967         } else
 968                 global_boost.attr.mode = 0444;
 969
 970         /* We create the boost file in any case, though for systems without
 971          * hardware support it will be read-only and hardwired to return 0.
 972          */
 973         if (cpufreq_sysfs_create_file(&(global_boost.attr)))
 974                 pr_warn(PFX "could not register global boost sysfs file\n");
 975         else
 976                 pr_debug("registered global boost sysfs file\n");
 977 }
 978
 979 static void __exit acpi_cpufreq_boost_exit(void)
 980 {
 981         cpufreq_sysfs_remove_file(&(global_boost.attr));
 982
 983         if (msrs) {
 984                 unregister_cpu_notifier(&boost_nb);
 985
 986                 msrs_free(msrs);
 987                 msrs = NULL;
 988         }
 989 }
 990
 991 static int __init acpi_cpufreq_init(void)
 992 {
 993         int ret;
 994
 995         if (acpi_disabled)
 996                 return 0;
 997
 998         pr_debug("acpi_cpufreq_init\n");
 999
1000         ret = acpi_cpufreq_early_init();
1001         if (ret)
1002                 return ret;
1003
1004 #ifdef CONFIG_X86_ACPI_CPUFREQ_CPB
1005         /* this is a sysfs file with a strange name and an even stranger
1006          * semantic - per CPU instantiation, but system global effect.
1007          * Lets enable it only on AMD CPUs for compatibility reasons and
1008          * only if configured. This is considered legacy code, which
1009          * will probably be removed at some point in the future.
1010          */
1011         if (check_amd_hwpstate_cpu(0)) {
1012                 struct freq_attr **iter;
1013
1014                 pr_debug("adding sysfs entry for cpb\n");
1015
1016                 for (iter = acpi_cpufreq_attr; *iter != NULL; iter++)
1017                         ;
1018
1019                 /* make sure there is a terminator behind it */
1020                 if (iter[1] == NULL)
1021                         *iter = &cpb;
1022         }
1023 #endif
1024
1025         ret = cpufreq_register_driver(&acpi_cpufreq_driver);
1026         if (ret)
1027                 free_acpi_perf_data();
1028         else
1029                 acpi_cpufreq_boost_init();
1030
1031         return ret;
1032 }
1033
1034 static void __exit acpi_cpufreq_exit(void)
1035 {
1036         pr_debug("acpi_cpufreq_exit\n");
1037
1038         acpi_cpufreq_boost_exit();
1039
1040         cpufreq_unregister_driver(&acpi_cpufreq_driver);
1041
1042         free_acpi_perf_data();
1043 }
1044
1045 module_param(acpi_pstate_strict, uint, 0644);
1046 MODULE_PARM_DESC(acpi_pstate_strict,
1047         "value 0 or non-zero. non-zero -> strict ACPI checks are "
1048         "performed during frequency changes.");
1049
1050 late_initcall(acpi_cpufreq_init);
1051 module_exit(acpi_cpufreq_exit);
1052
1053 static const struct x86_cpu_id acpi_cpufreq_ids[] = {
1054         X86_FEATURE_MATCH(X86_FEATURE_ACPI),
1055         X86_FEATURE_MATCH(X86_FEATURE_HW_PSTATE),
1056         {}
1057 };
1058 MODULE_DEVICE_TABLE(x86cpu, acpi_cpufreq_ids);
1059
1060 static const struct acpi_device_id processor_device_ids[] = {
1061         {ACPI_PROCESSOR_OBJECT_HID, },
1062         {ACPI_PROCESSOR_DEVICE_HID, },
1063         {},
1064 };
1065 MODULE_DEVICE_TABLE(acpi, processor_device_ids);
1066
1067 MODULE_ALIAS("acpi");