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