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