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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * processor_perflib.c - ACPI Processor P-States Library ($Revision: 71 $)4 *5 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>7 * Copyright (C) 2004 Dominik Brodowski <linux@brodo.de>8 * Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>9 * - Added processor hotplug support10 */11 12#define pr_fmt(fmt) "ACPI: " fmt13 14#include <linux/kernel.h>15#include <linux/module.h>16#include <linux/init.h>17#include <linux/cpufreq.h>18#include <linux/slab.h>19#include <linux/acpi.h>20#include <acpi/processor.h>21#ifdef CONFIG_X8622#include <asm/cpufeature.h>23#endif24 25#define ACPI_PROCESSOR_FILE_PERFORMANCE "performance"26 27static DEFINE_MUTEX(performance_mutex);28 29/*30 * _PPC support is implemented as a CPUfreq policy notifier:31 * This means each time a CPUfreq driver registered also with32 * the ACPI core is asked to change the speed policy, the maximum33 * value is adjusted so that it is within the platform limit.34 *35 * Also, when a new platform limit value is detected, the CPUfreq36 * policy is adjusted accordingly.37 */38 39/* ignore_ppc:40 * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet41 * ignore _PPC42 * 0 -> cpufreq low level drivers initialized -> consider _PPC values43 * 1 -> ignore _PPC totally -> forced by user through boot param44 */45static int ignore_ppc = -1;46module_param(ignore_ppc, int, 0644);47MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \48 "limited by BIOS, this should help");49 50static bool acpi_processor_ppc_in_use;51 52static int acpi_processor_get_platform_limit(struct acpi_processor *pr)53{54 acpi_status status = 0;55 unsigned long long ppc = 0;56 s32 qos_value;57 int index;58 int ret;59 60 if (!pr)61 return -EINVAL;62 63 /*64 * _PPC indicates the maximum state currently supported by the platform65 * (e.g. 0 = states 0..n; 1 = states 1..n; etc.66 */67 status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);68 if (status != AE_NOT_FOUND) {69 acpi_processor_ppc_in_use = true;70 71 if (ACPI_FAILURE(status)) {72 acpi_evaluation_failure_warn(pr->handle, "_PPC", status);73 return -ENODEV;74 }75 }76 77 index = ppc;78 79 if (pr->performance_platform_limit == index ||80 ppc >= pr->performance->state_count)81 return 0;82 83 pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,84 index, index ? "is" : "is not");85 86 pr->performance_platform_limit = index;87 88 if (unlikely(!freq_qos_request_active(&pr->perflib_req)))89 return 0;90 91 /*92 * If _PPC returns 0, it means that all of the available states can be93 * used ("no limit").94 */95 if (index == 0)96 qos_value = FREQ_QOS_MAX_DEFAULT_VALUE;97 else98 qos_value = pr->performance->states[index].core_frequency * 1000;99 100 ret = freq_qos_update_request(&pr->perflib_req, qos_value);101 if (ret < 0) {102 pr_warn("Failed to update perflib freq constraint: CPU%d (%d)\n",103 pr->id, ret);104 }105 106 return 0;107}108 109#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80110/*111 * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status112 * @handle: ACPI processor handle113 * @status: the status code of _PPC evaluation114 * 0: success. OSPM is now using the performance state specified.115 * 1: failure. OSPM has not changed the number of P-states in use116 */117static void acpi_processor_ppc_ost(acpi_handle handle, int status)118{119 if (acpi_has_method(handle, "_OST"))120 acpi_evaluate_ost(handle, ACPI_PROCESSOR_NOTIFY_PERFORMANCE,121 status, NULL);122}123 124void acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)125{126 int ret;127 128 if (ignore_ppc || !pr->performance) {129 /*130 * Only when it is notification event, the _OST object131 * will be evaluated. Otherwise it is skipped.132 */133 if (event_flag)134 acpi_processor_ppc_ost(pr->handle, 1);135 return;136 }137 138 ret = acpi_processor_get_platform_limit(pr);139 /*140 * Only when it is notification event, the _OST object141 * will be evaluated. Otherwise it is skipped.142 */143 if (event_flag) {144 if (ret < 0)145 acpi_processor_ppc_ost(pr->handle, 1);146 else147 acpi_processor_ppc_ost(pr->handle, 0);148 }149 if (ret >= 0)150 cpufreq_update_limits(pr->id);151}152 153int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)154{155 struct acpi_processor *pr;156 157 pr = per_cpu(processors, cpu);158 if (!pr || !pr->performance || !pr->performance->state_count)159 return -ENODEV;160 161 *limit = pr->performance->states[pr->performance_platform_limit].162 core_frequency * 1000;163 return 0;164}165EXPORT_SYMBOL(acpi_processor_get_bios_limit);166 167void acpi_processor_ignore_ppc_init(void)168{169 if (ignore_ppc < 0)170 ignore_ppc = 0;171}172 173void acpi_processor_ppc_init(struct cpufreq_policy *policy)174{175 unsigned int cpu;176 177 for_each_cpu(cpu, policy->related_cpus) {178 struct acpi_processor *pr = per_cpu(processors, cpu);179 int ret;180 181 if (!pr)182 continue;183 184 /*185 * Reset performance_platform_limit in case there is a stale186 * value in it, so as to make it match the "no limit" QoS value187 * below.188 */189 pr->performance_platform_limit = 0;190 191 ret = freq_qos_add_request(&policy->constraints,192 &pr->perflib_req, FREQ_QOS_MAX,193 FREQ_QOS_MAX_DEFAULT_VALUE);194 if (ret < 0)195 pr_err("Failed to add freq constraint for CPU%d (%d)\n",196 cpu, ret);197 }198}199 200void acpi_processor_ppc_exit(struct cpufreq_policy *policy)201{202 unsigned int cpu;203 204 for_each_cpu(cpu, policy->related_cpus) {205 struct acpi_processor *pr = per_cpu(processors, cpu);206 207 if (pr)208 freq_qos_remove_request(&pr->perflib_req);209 }210}211 212static int acpi_processor_get_performance_control(struct acpi_processor *pr)213{214 int result = 0;215 acpi_status status = 0;216 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };217 union acpi_object *pct = NULL;218 union acpi_object obj = { 0 };219 220 status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);221 if (ACPI_FAILURE(status)) {222 acpi_evaluation_failure_warn(pr->handle, "_PCT", status);223 return -ENODEV;224 }225 226 pct = (union acpi_object *)buffer.pointer;227 if (!pct || pct->type != ACPI_TYPE_PACKAGE || pct->package.count != 2) {228 pr_err("Invalid _PCT data\n");229 result = -EFAULT;230 goto end;231 }232 233 /*234 * control_register235 */236 237 obj = pct->package.elements[0];238 239 if (!obj.buffer.pointer || obj.type != ACPI_TYPE_BUFFER ||240 obj.buffer.length < sizeof(struct acpi_pct_register)) {241 pr_err("Invalid _PCT data (control_register)\n");242 result = -EFAULT;243 goto end;244 }245 memcpy(&pr->performance->control_register, obj.buffer.pointer,246 sizeof(struct acpi_pct_register));247 248 /*249 * status_register250 */251 252 obj = pct->package.elements[1];253 254 if (!obj.buffer.pointer || obj.type != ACPI_TYPE_BUFFER ||255 obj.buffer.length < sizeof(struct acpi_pct_register)) {256 pr_err("Invalid _PCT data (status_register)\n");257 result = -EFAULT;258 goto end;259 }260 261 memcpy(&pr->performance->status_register, obj.buffer.pointer,262 sizeof(struct acpi_pct_register));263 264end:265 kfree(buffer.pointer);266 267 return result;268}269 270#ifdef CONFIG_X86271/*272 * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding273 * in their ACPI data. Calculate the real values and fix up the _PSS data.274 */275static void amd_fixup_frequency(struct acpi_processor_px *px, int i)276{277 u32 hi, lo, fid, did;278 int index = px->control & 0x00000007;279 280 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)281 return;282 283 if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10) ||284 boot_cpu_data.x86 == 0x11) {285 rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);286 /*287 * MSR C001_0064+:288 * Bit 63: PstateEn. Read-write. If set, the P-state is valid.289 */290 if (!(hi & BIT(31)))291 return;292 293 fid = lo & 0x3f;294 did = (lo >> 6) & 7;295 if (boot_cpu_data.x86 == 0x10)296 px->core_frequency = (100 * (fid + 0x10)) >> did;297 else298 px->core_frequency = (100 * (fid + 8)) >> did;299 }300}301#else302static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};303#endif304 305static int acpi_processor_get_performance_states(struct acpi_processor *pr)306{307 int result = 0;308 acpi_status status = AE_OK;309 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };310 struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };311 struct acpi_buffer state = { 0, NULL };312 union acpi_object *pss = NULL;313 int i;314 int last_invalid = -1;315 316 status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);317 if (ACPI_FAILURE(status)) {318 acpi_evaluation_failure_warn(pr->handle, "_PSS", status);319 return -ENODEV;320 }321 322 pss = buffer.pointer;323 if (!pss || pss->type != ACPI_TYPE_PACKAGE) {324 pr_err("Invalid _PSS data\n");325 result = -EFAULT;326 goto end;327 }328 329 acpi_handle_debug(pr->handle, "Found %d performance states\n",330 pss->package.count);331 332 pr->performance->state_count = pss->package.count;333 pr->performance->states =334 kmalloc_array(pss->package.count,335 sizeof(struct acpi_processor_px),336 GFP_KERNEL);337 if (!pr->performance->states) {338 result = -ENOMEM;339 goto end;340 }341 342 for (i = 0; i < pr->performance->state_count; i++) {343 344 struct acpi_processor_px *px = &(pr->performance->states[i]);345 346 state.length = sizeof(struct acpi_processor_px);347 state.pointer = px;348 349 acpi_handle_debug(pr->handle, "Extracting state %d\n", i);350 351 status = acpi_extract_package(&(pss->package.elements[i]),352 &format, &state);353 if (ACPI_FAILURE(status)) {354 acpi_handle_warn(pr->handle, "Invalid _PSS data: %s\n",355 acpi_format_exception(status));356 result = -EFAULT;357 kfree(pr->performance->states);358 goto end;359 }360 361 amd_fixup_frequency(px, i);362 363 acpi_handle_debug(pr->handle,364 "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",365 i,366 (u32) px->core_frequency,367 (u32) px->power,368 (u32) px->transition_latency,369 (u32) px->bus_master_latency,370 (u32) px->control, (u32) px->status);371 372 /*373 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq374 */375 if (!px->core_frequency ||376 (u32)(px->core_frequency * 1000) != px->core_frequency * 1000) {377 pr_err(FW_BUG378 "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",379 pr->id, px->core_frequency);380 if (last_invalid == -1)381 last_invalid = i;382 } else {383 if (last_invalid != -1) {384 /*385 * Copy this valid entry over last_invalid entry386 */387 memcpy(&(pr->performance->states[last_invalid]),388 px, sizeof(struct acpi_processor_px));389 ++last_invalid;390 }391 }392 }393 394 if (last_invalid == 0) {395 pr_err(FW_BUG396 "No valid BIOS _PSS frequency found for processor %d\n", pr->id);397 result = -EFAULT;398 kfree(pr->performance->states);399 pr->performance->states = NULL;400 }401 402 if (last_invalid > 0)403 pr->performance->state_count = last_invalid;404 405end:406 kfree(buffer.pointer);407 408 return result;409}410 411int acpi_processor_get_performance_info(struct acpi_processor *pr)412{413 int result = 0;414 415 if (!pr || !pr->performance || !pr->handle)416 return -EINVAL;417 418 if (!acpi_has_method(pr->handle, "_PCT")) {419 acpi_handle_debug(pr->handle,420 "ACPI-based processor performance control unavailable\n");421 return -ENODEV;422 }423 424 result = acpi_processor_get_performance_control(pr);425 if (result)426 goto update_bios;427 428 result = acpi_processor_get_performance_states(pr);429 if (result)430 goto update_bios;431 432 /* We need to call _PPC once when cpufreq starts */433 if (ignore_ppc != 1)434 result = acpi_processor_get_platform_limit(pr);435 436 return result;437 438 /*439 * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that440 * the BIOS is older than the CPU and does not know its frequencies441 */442 update_bios:443#ifdef CONFIG_X86444 if (acpi_has_method(pr->handle, "_PPC")) {445 if(boot_cpu_has(X86_FEATURE_EST))446 pr_warn(FW_BUG "BIOS needs update for CPU "447 "frequency support\n");448 }449#endif450 return result;451}452EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);453 454int acpi_processor_pstate_control(void)455{456 acpi_status status;457 458 if (!acpi_gbl_FADT.smi_command || !acpi_gbl_FADT.pstate_control)459 return 0;460 461 pr_debug("Writing pstate_control [0x%x] to smi_command [0x%x]\n",462 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command);463 464 status = acpi_os_write_port(acpi_gbl_FADT.smi_command,465 (u32)acpi_gbl_FADT.pstate_control, 8);466 if (ACPI_SUCCESS(status))467 return 1;468 469 pr_warn("Failed to write pstate_control [0x%x] to smi_command [0x%x]: %s\n",470 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command,471 acpi_format_exception(status));472 return -EIO;473}474 475int acpi_processor_notify_smm(struct module *calling_module)476{477 static int is_done;478 int result = 0;479 480 if (!acpi_processor_cpufreq_init)481 return -EBUSY;482 483 if (!try_module_get(calling_module))484 return -EINVAL;485 486 /*487 * is_done is set to negative if an error occurs and to 1 if no error488 * occurrs, but SMM has been notified already. This avoids repeated489 * notification which might lead to unexpected results.490 */491 if (is_done != 0) {492 if (is_done < 0)493 result = is_done;494 495 goto out_put;496 }497 498 result = acpi_processor_pstate_control();499 if (result <= 0) {500 if (result) {501 is_done = result;502 } else {503 pr_debug("No SMI port or pstate_control\n");504 is_done = 1;505 }506 goto out_put;507 }508 509 is_done = 1;510 /*511 * Success. If there _PPC, unloading the cpufreq driver would be risky,512 * so disallow it in that case.513 */514 if (acpi_processor_ppc_in_use)515 return 0;516 517out_put:518 module_put(calling_module);519 return result;520}521EXPORT_SYMBOL(acpi_processor_notify_smm);522 523int acpi_processor_get_psd(acpi_handle handle, struct acpi_psd_package *pdomain)524{525 int result = 0;526 acpi_status status = AE_OK;527 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};528 struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};529 struct acpi_buffer state = {0, NULL};530 union acpi_object *psd = NULL;531 532 status = acpi_evaluate_object(handle, "_PSD", NULL, &buffer);533 if (ACPI_FAILURE(status)) {534 return -ENODEV;535 }536 537 psd = buffer.pointer;538 if (!psd || psd->type != ACPI_TYPE_PACKAGE) {539 pr_err("Invalid _PSD data\n");540 result = -EFAULT;541 goto end;542 }543 544 if (psd->package.count != 1) {545 pr_err("Invalid _PSD data\n");546 result = -EFAULT;547 goto end;548 }549 550 state.length = sizeof(struct acpi_psd_package);551 state.pointer = pdomain;552 553 status = acpi_extract_package(&(psd->package.elements[0]), &format, &state);554 if (ACPI_FAILURE(status)) {555 pr_err("Invalid _PSD data\n");556 result = -EFAULT;557 goto end;558 }559 560 if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {561 pr_err("Unknown _PSD:num_entries\n");562 result = -EFAULT;563 goto end;564 }565 566 if (pdomain->revision != ACPI_PSD_REV0_REVISION) {567 pr_err("Unknown _PSD:revision\n");568 result = -EFAULT;569 goto end;570 }571 572 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&573 pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&574 pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {575 pr_err("Invalid _PSD:coord_type\n");576 result = -EFAULT;577 goto end;578 }579end:580 kfree(buffer.pointer);581 return result;582}583EXPORT_SYMBOL(acpi_processor_get_psd);584 585int acpi_processor_preregister_performance(586 struct acpi_processor_performance __percpu *performance)587{588 int count_target;589 int retval = 0;590 unsigned int i, j;591 cpumask_var_t covered_cpus;592 struct acpi_processor *pr;593 struct acpi_psd_package *pdomain;594 struct acpi_processor *match_pr;595 struct acpi_psd_package *match_pdomain;596 597 if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))598 return -ENOMEM;599 600 mutex_lock(&performance_mutex);601 602 /*603 * Check if another driver has already registered, and abort before604 * changing pr->performance if it has. Check input data as well.605 */606 for_each_possible_cpu(i) {607 pr = per_cpu(processors, i);608 if (!pr) {609 /* Look only at processors in ACPI namespace */610 continue;611 }612 613 if (pr->performance) {614 retval = -EBUSY;615 goto err_out;616 }617 618 if (!performance || !per_cpu_ptr(performance, i)) {619 retval = -EINVAL;620 goto err_out;621 }622 }623 624 /* Call _PSD for all CPUs */625 for_each_possible_cpu(i) {626 pr = per_cpu(processors, i);627 if (!pr)628 continue;629 630 pr->performance = per_cpu_ptr(performance, i);631 pdomain = &(pr->performance->domain_info);632 if (acpi_processor_get_psd(pr->handle, pdomain)) {633 retval = -EINVAL;634 continue;635 }636 }637 if (retval)638 goto err_ret;639 640 /*641 * Now that we have _PSD data from all CPUs, lets setup P-state642 * domain info.643 */644 for_each_possible_cpu(i) {645 pr = per_cpu(processors, i);646 if (!pr)647 continue;648 649 if (cpumask_test_cpu(i, covered_cpus))650 continue;651 652 pdomain = &(pr->performance->domain_info);653 cpumask_set_cpu(i, pr->performance->shared_cpu_map);654 cpumask_set_cpu(i, covered_cpus);655 if (pdomain->num_processors <= 1)656 continue;657 658 /* Validate the Domain info */659 count_target = pdomain->num_processors;660 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)661 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;662 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)663 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;664 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)665 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;666 667 for_each_possible_cpu(j) {668 if (i == j)669 continue;670 671 match_pr = per_cpu(processors, j);672 if (!match_pr)673 continue;674 675 match_pdomain = &(match_pr->performance->domain_info);676 if (match_pdomain->domain != pdomain->domain)677 continue;678 679 /* Here i and j are in the same domain */680 681 if (match_pdomain->num_processors != count_target) {682 retval = -EINVAL;683 goto err_ret;684 }685 686 if (pdomain->coord_type != match_pdomain->coord_type) {687 retval = -EINVAL;688 goto err_ret;689 }690 691 cpumask_set_cpu(j, covered_cpus);692 cpumask_set_cpu(j, pr->performance->shared_cpu_map);693 }694 695 for_each_possible_cpu(j) {696 if (i == j)697 continue;698 699 match_pr = per_cpu(processors, j);700 if (!match_pr)701 continue;702 703 match_pdomain = &(match_pr->performance->domain_info);704 if (match_pdomain->domain != pdomain->domain)705 continue;706 707 match_pr->performance->shared_type =708 pr->performance->shared_type;709 cpumask_copy(match_pr->performance->shared_cpu_map,710 pr->performance->shared_cpu_map);711 }712 }713 714err_ret:715 for_each_possible_cpu(i) {716 pr = per_cpu(processors, i);717 if (!pr || !pr->performance)718 continue;719 720 /* Assume no coordination on any error parsing domain info */721 if (retval) {722 cpumask_clear(pr->performance->shared_cpu_map);723 cpumask_set_cpu(i, pr->performance->shared_cpu_map);724 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_NONE;725 }726 pr->performance = NULL; /* Will be set for real in register */727 }728 729err_out:730 mutex_unlock(&performance_mutex);731 free_cpumask_var(covered_cpus);732 return retval;733}734EXPORT_SYMBOL(acpi_processor_preregister_performance);735 736int acpi_processor_register_performance(struct acpi_processor_performance737 *performance, unsigned int cpu)738{739 struct acpi_processor *pr;740 741 if (!acpi_processor_cpufreq_init)742 return -EINVAL;743 744 mutex_lock(&performance_mutex);745 746 pr = per_cpu(processors, cpu);747 if (!pr) {748 mutex_unlock(&performance_mutex);749 return -ENODEV;750 }751 752 if (pr->performance) {753 mutex_unlock(&performance_mutex);754 return -EBUSY;755 }756 757 WARN_ON(!performance);758 759 pr->performance = performance;760 761 if (acpi_processor_get_performance_info(pr)) {762 pr->performance = NULL;763 mutex_unlock(&performance_mutex);764 return -EIO;765 }766 767 mutex_unlock(&performance_mutex);768 return 0;769}770EXPORT_SYMBOL(acpi_processor_register_performance);771 772void acpi_processor_unregister_performance(unsigned int cpu)773{774 struct acpi_processor *pr;775 776 mutex_lock(&performance_mutex);777 778 pr = per_cpu(processors, cpu);779 if (!pr)780 goto unlock;781 782 if (pr->performance)783 kfree(pr->performance->states);784 785 pr->performance = NULL;786 787unlock:788 mutex_unlock(&performance_mutex);789}790EXPORT_SYMBOL(acpi_processor_unregister_performance);791