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778 lines
19 KiB
778 lines
19 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* processor_perflib.c - ACPI Processor P-States Library ($Revision: 71 $) |
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* |
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* Copyright (C) 2001, 2002 Andy Grover <[email protected]> |
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <[email protected]> |
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* Copyright (C) 2004 Dominik Brodowski <[email protected]> |
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* Copyright (C) 2004 Anil S Keshavamurthy <[email protected]> |
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* - Added processor hotplug support |
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*/ |
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|
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#define pr_fmt(fmt) "ACPI: " fmt |
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|
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/cpufreq.h> |
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#include <linux/slab.h> |
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#include <linux/acpi.h> |
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#include <acpi/processor.h> |
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#ifdef CONFIG_X86 |
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#include <asm/cpufeature.h> |
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#endif |
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#define ACPI_PROCESSOR_FILE_PERFORMANCE "performance" |
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static DEFINE_MUTEX(performance_mutex); |
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/* |
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* _PPC support is implemented as a CPUfreq policy notifier: |
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* This means each time a CPUfreq driver registered also with |
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* the ACPI core is asked to change the speed policy, the maximum |
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* value is adjusted so that it is within the platform limit. |
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* |
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* Also, when a new platform limit value is detected, the CPUfreq |
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* policy is adjusted accordingly. |
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*/ |
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/* ignore_ppc: |
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* -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet |
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* ignore _PPC |
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* 0 -> cpufreq low level drivers initialized -> consider _PPC values |
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* 1 -> ignore _PPC totally -> forced by user through boot param |
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*/ |
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static int ignore_ppc = -1; |
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module_param(ignore_ppc, int, 0644); |
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MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \ |
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"limited by BIOS, this should help"); |
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static bool acpi_processor_ppc_in_use; |
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static int acpi_processor_get_platform_limit(struct acpi_processor *pr) |
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{ |
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acpi_status status = 0; |
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unsigned long long ppc = 0; |
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int ret; |
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if (!pr) |
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return -EINVAL; |
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|
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/* |
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* _PPC indicates the maximum state currently supported by the platform |
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* (e.g. 0 = states 0..n; 1 = states 1..n; etc. |
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*/ |
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status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc); |
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if (status != AE_NOT_FOUND) { |
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acpi_processor_ppc_in_use = true; |
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if (ACPI_FAILURE(status)) { |
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acpi_evaluation_failure_warn(pr->handle, "_PPC", status); |
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return -ENODEV; |
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} |
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} |
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pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id, |
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(int)ppc, ppc ? "" : "not"); |
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pr->performance_platform_limit = (int)ppc; |
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if (ppc >= pr->performance->state_count || |
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unlikely(!freq_qos_request_active(&pr->perflib_req))) |
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return 0; |
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ret = freq_qos_update_request(&pr->perflib_req, |
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pr->performance->states[ppc].core_frequency * 1000); |
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if (ret < 0) { |
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pr_warn("Failed to update perflib freq constraint: CPU%d (%d)\n", |
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pr->id, ret); |
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} |
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return 0; |
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} |
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#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80 |
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/* |
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* acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status |
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* @handle: ACPI processor handle |
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* @status: the status code of _PPC evaluation |
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* 0: success. OSPM is now using the performance state specified. |
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* 1: failure. OSPM has not changed the number of P-states in use |
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*/ |
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static void acpi_processor_ppc_ost(acpi_handle handle, int status) |
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{ |
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if (acpi_has_method(handle, "_OST")) |
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acpi_evaluate_ost(handle, ACPI_PROCESSOR_NOTIFY_PERFORMANCE, |
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status, NULL); |
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} |
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void acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag) |
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{ |
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int ret; |
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if (ignore_ppc || !pr->performance) { |
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/* |
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* Only when it is notification event, the _OST object |
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* will be evaluated. Otherwise it is skipped. |
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*/ |
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if (event_flag) |
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acpi_processor_ppc_ost(pr->handle, 1); |
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return; |
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} |
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ret = acpi_processor_get_platform_limit(pr); |
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/* |
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* Only when it is notification event, the _OST object |
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* will be evaluated. Otherwise it is skipped. |
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*/ |
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if (event_flag) { |
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if (ret < 0) |
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acpi_processor_ppc_ost(pr->handle, 1); |
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else |
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acpi_processor_ppc_ost(pr->handle, 0); |
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} |
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if (ret >= 0) |
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cpufreq_update_limits(pr->id); |
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} |
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int acpi_processor_get_bios_limit(int cpu, unsigned int *limit) |
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{ |
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struct acpi_processor *pr; |
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pr = per_cpu(processors, cpu); |
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if (!pr || !pr->performance || !pr->performance->state_count) |
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return -ENODEV; |
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*limit = pr->performance->states[pr->performance_platform_limit]. |
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core_frequency * 1000; |
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return 0; |
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} |
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EXPORT_SYMBOL(acpi_processor_get_bios_limit); |
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void acpi_processor_ignore_ppc_init(void) |
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{ |
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if (ignore_ppc < 0) |
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ignore_ppc = 0; |
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} |
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void acpi_processor_ppc_init(struct cpufreq_policy *policy) |
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{ |
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unsigned int cpu; |
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for_each_cpu(cpu, policy->related_cpus) { |
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struct acpi_processor *pr = per_cpu(processors, cpu); |
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int ret; |
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if (!pr) |
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continue; |
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ret = freq_qos_add_request(&policy->constraints, |
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&pr->perflib_req, |
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FREQ_QOS_MAX, INT_MAX); |
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if (ret < 0) |
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pr_err("Failed to add freq constraint for CPU%d (%d)\n", |
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cpu, ret); |
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} |
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} |
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void acpi_processor_ppc_exit(struct cpufreq_policy *policy) |
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{ |
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unsigned int cpu; |
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for_each_cpu(cpu, policy->related_cpus) { |
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struct acpi_processor *pr = per_cpu(processors, cpu); |
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if (pr) |
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freq_qos_remove_request(&pr->perflib_req); |
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} |
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} |
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static int acpi_processor_get_performance_control(struct acpi_processor *pr) |
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{ |
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int result = 0; |
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acpi_status status = 0; |
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
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union acpi_object *pct = NULL; |
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union acpi_object obj = { 0 }; |
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status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer); |
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if (ACPI_FAILURE(status)) { |
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acpi_evaluation_failure_warn(pr->handle, "_PCT", status); |
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return -ENODEV; |
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} |
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pct = (union acpi_object *)buffer.pointer; |
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if (!pct || (pct->type != ACPI_TYPE_PACKAGE) |
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|| (pct->package.count != 2)) { |
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pr_err("Invalid _PCT data\n"); |
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result = -EFAULT; |
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goto end; |
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} |
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/* |
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* control_register |
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*/ |
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obj = pct->package.elements[0]; |
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if ((obj.type != ACPI_TYPE_BUFFER) |
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|| (obj.buffer.length < sizeof(struct acpi_pct_register)) |
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|| (obj.buffer.pointer == NULL)) { |
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pr_err("Invalid _PCT data (control_register)\n"); |
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result = -EFAULT; |
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goto end; |
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} |
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memcpy(&pr->performance->control_register, obj.buffer.pointer, |
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sizeof(struct acpi_pct_register)); |
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/* |
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* status_register |
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*/ |
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obj = pct->package.elements[1]; |
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if ((obj.type != ACPI_TYPE_BUFFER) |
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|| (obj.buffer.length < sizeof(struct acpi_pct_register)) |
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|| (obj.buffer.pointer == NULL)) { |
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pr_err("Invalid _PCT data (status_register)\n"); |
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result = -EFAULT; |
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goto end; |
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} |
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memcpy(&pr->performance->status_register, obj.buffer.pointer, |
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sizeof(struct acpi_pct_register)); |
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end: |
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kfree(buffer.pointer); |
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return result; |
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} |
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#ifdef CONFIG_X86 |
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/* |
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* Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding |
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* in their ACPI data. Calculate the real values and fix up the _PSS data. |
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*/ |
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static void amd_fixup_frequency(struct acpi_processor_px *px, int i) |
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{ |
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u32 hi, lo, fid, did; |
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int index = px->control & 0x00000007; |
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if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD) |
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return; |
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if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10) |
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|| boot_cpu_data.x86 == 0x11) { |
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rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi); |
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/* |
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* MSR C001_0064+: |
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* Bit 63: PstateEn. Read-write. If set, the P-state is valid. |
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*/ |
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if (!(hi & BIT(31))) |
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return; |
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fid = lo & 0x3f; |
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did = (lo >> 6) & 7; |
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if (boot_cpu_data.x86 == 0x10) |
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px->core_frequency = (100 * (fid + 0x10)) >> did; |
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else |
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px->core_frequency = (100 * (fid + 8)) >> did; |
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} |
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} |
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#else |
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static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {}; |
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#endif |
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static int acpi_processor_get_performance_states(struct acpi_processor *pr) |
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{ |
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int result = 0; |
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acpi_status status = AE_OK; |
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
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struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" }; |
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struct acpi_buffer state = { 0, NULL }; |
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union acpi_object *pss = NULL; |
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int i; |
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int last_invalid = -1; |
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status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer); |
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if (ACPI_FAILURE(status)) { |
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acpi_evaluation_failure_warn(pr->handle, "_PSS", status); |
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return -ENODEV; |
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} |
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pss = buffer.pointer; |
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if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) { |
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pr_err("Invalid _PSS data\n"); |
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result = -EFAULT; |
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goto end; |
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} |
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acpi_handle_debug(pr->handle, "Found %d performance states\n", |
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pss->package.count); |
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pr->performance->state_count = pss->package.count; |
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pr->performance->states = |
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kmalloc_array(pss->package.count, |
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sizeof(struct acpi_processor_px), |
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GFP_KERNEL); |
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if (!pr->performance->states) { |
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result = -ENOMEM; |
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goto end; |
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} |
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for (i = 0; i < pr->performance->state_count; i++) { |
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struct acpi_processor_px *px = &(pr->performance->states[i]); |
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state.length = sizeof(struct acpi_processor_px); |
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state.pointer = px; |
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acpi_handle_debug(pr->handle, "Extracting state %d\n", i); |
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status = acpi_extract_package(&(pss->package.elements[i]), |
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&format, &state); |
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if (ACPI_FAILURE(status)) { |
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acpi_handle_warn(pr->handle, "Invalid _PSS data: %s\n", |
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acpi_format_exception(status)); |
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result = -EFAULT; |
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kfree(pr->performance->states); |
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goto end; |
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} |
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amd_fixup_frequency(px, i); |
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acpi_handle_debug(pr->handle, |
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"State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n", |
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i, |
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(u32) px->core_frequency, |
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(u32) px->power, |
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(u32) px->transition_latency, |
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(u32) px->bus_master_latency, |
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(u32) px->control, (u32) px->status); |
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/* |
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* Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq |
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*/ |
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if (!px->core_frequency || |
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((u32)(px->core_frequency * 1000) != |
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(px->core_frequency * 1000))) { |
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pr_err(FW_BUG |
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"Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n", |
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pr->id, px->core_frequency); |
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if (last_invalid == -1) |
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last_invalid = i; |
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} else { |
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if (last_invalid != -1) { |
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/* |
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* Copy this valid entry over last_invalid entry |
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*/ |
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memcpy(&(pr->performance->states[last_invalid]), |
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px, sizeof(struct acpi_processor_px)); |
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++last_invalid; |
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} |
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} |
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} |
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if (last_invalid == 0) { |
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pr_err(FW_BUG |
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"No valid BIOS _PSS frequency found for processor %d\n", pr->id); |
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result = -EFAULT; |
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kfree(pr->performance->states); |
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pr->performance->states = NULL; |
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} |
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if (last_invalid > 0) |
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pr->performance->state_count = last_invalid; |
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end: |
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kfree(buffer.pointer); |
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return result; |
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} |
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int acpi_processor_get_performance_info(struct acpi_processor *pr) |
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{ |
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int result = 0; |
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if (!pr || !pr->performance || !pr->handle) |
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return -EINVAL; |
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if (!acpi_has_method(pr->handle, "_PCT")) { |
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acpi_handle_debug(pr->handle, |
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"ACPI-based processor performance control unavailable\n"); |
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return -ENODEV; |
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} |
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result = acpi_processor_get_performance_control(pr); |
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if (result) |
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goto update_bios; |
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result = acpi_processor_get_performance_states(pr); |
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if (result) |
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goto update_bios; |
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/* We need to call _PPC once when cpufreq starts */ |
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if (ignore_ppc != 1) |
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result = acpi_processor_get_platform_limit(pr); |
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return result; |
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/* |
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* Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that |
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* the BIOS is older than the CPU and does not know its frequencies |
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*/ |
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update_bios: |
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#ifdef CONFIG_X86 |
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if (acpi_has_method(pr->handle, "_PPC")) { |
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if(boot_cpu_has(X86_FEATURE_EST)) |
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pr_warn(FW_BUG "BIOS needs update for CPU " |
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"frequency support\n"); |
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} |
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#endif |
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return result; |
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} |
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EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info); |
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int acpi_processor_pstate_control(void) |
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{ |
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acpi_status status; |
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if (!acpi_gbl_FADT.smi_command || !acpi_gbl_FADT.pstate_control) |
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return 0; |
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pr_debug("Writing pstate_control [0x%x] to smi_command [0x%x]\n", |
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acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command); |
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status = acpi_os_write_port(acpi_gbl_FADT.smi_command, |
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(u32)acpi_gbl_FADT.pstate_control, 8); |
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if (ACPI_SUCCESS(status)) |
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return 1; |
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pr_warn("Failed to write pstate_control [0x%x] to smi_command [0x%x]: %s\n", |
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acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command, |
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acpi_format_exception(status)); |
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return -EIO; |
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} |
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int acpi_processor_notify_smm(struct module *calling_module) |
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{ |
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static int is_done; |
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int result; |
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if (!acpi_processor_cpufreq_init) |
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return -EBUSY; |
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if (!try_module_get(calling_module)) |
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return -EINVAL; |
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/* is_done is set to negative if an error occurred, |
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* and to postitive if _no_ error occurred, but SMM |
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* was already notified. This avoids double notification |
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* which might lead to unexpected results... |
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*/ |
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if (is_done > 0) { |
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module_put(calling_module); |
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return 0; |
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} else if (is_done < 0) { |
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module_put(calling_module); |
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return is_done; |
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} |
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is_done = -EIO; |
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result = acpi_processor_pstate_control(); |
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if (!result) { |
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pr_debug("No SMI port or pstate_control\n"); |
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module_put(calling_module); |
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return 0; |
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} |
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if (result < 0) { |
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module_put(calling_module); |
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return result; |
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} |
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/* Success. If there's no _PPC, we need to fear nothing, so |
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* we can allow the cpufreq driver to be rmmod'ed. */ |
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is_done = 1; |
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|
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if (!acpi_processor_ppc_in_use) |
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module_put(calling_module); |
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return 0; |
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} |
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EXPORT_SYMBOL(acpi_processor_notify_smm); |
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|
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int acpi_processor_get_psd(acpi_handle handle, struct acpi_psd_package *pdomain) |
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{ |
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int result = 0; |
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acpi_status status = AE_OK; |
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struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; |
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struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"}; |
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struct acpi_buffer state = {0, NULL}; |
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union acpi_object *psd = NULL; |
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status = acpi_evaluate_object(handle, "_PSD", NULL, &buffer); |
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if (ACPI_FAILURE(status)) { |
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return -ENODEV; |
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} |
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psd = buffer.pointer; |
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if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) { |
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pr_err("Invalid _PSD data\n"); |
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result = -EFAULT; |
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goto end; |
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} |
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if (psd->package.count != 1) { |
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pr_err("Invalid _PSD data\n"); |
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result = -EFAULT; |
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goto end; |
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} |
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state.length = sizeof(struct acpi_psd_package); |
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state.pointer = pdomain; |
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|
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status = acpi_extract_package(&(psd->package.elements[0]), |
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&format, &state); |
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if (ACPI_FAILURE(status)) { |
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pr_err("Invalid _PSD data\n"); |
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result = -EFAULT; |
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goto end; |
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} |
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if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) { |
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pr_err("Unknown _PSD:num_entries\n"); |
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result = -EFAULT; |
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goto end; |
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} |
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if (pdomain->revision != ACPI_PSD_REV0_REVISION) { |
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pr_err("Unknown _PSD:revision\n"); |
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result = -EFAULT; |
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goto end; |
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} |
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|
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if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL && |
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pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY && |
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pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) { |
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pr_err("Invalid _PSD:coord_type\n"); |
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result = -EFAULT; |
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goto end; |
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} |
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end: |
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kfree(buffer.pointer); |
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return result; |
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} |
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EXPORT_SYMBOL(acpi_processor_get_psd); |
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|
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int acpi_processor_preregister_performance( |
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struct acpi_processor_performance __percpu *performance) |
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{ |
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int count_target; |
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int retval = 0; |
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unsigned int i, j; |
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cpumask_var_t covered_cpus; |
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struct acpi_processor *pr; |
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struct acpi_psd_package *pdomain; |
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struct acpi_processor *match_pr; |
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struct acpi_psd_package *match_pdomain; |
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|
|
if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL)) |
|
return -ENOMEM; |
|
|
|
mutex_lock(&performance_mutex); |
|
|
|
/* |
|
* Check if another driver has already registered, and abort before |
|
* changing pr->performance if it has. Check input data as well. |
|
*/ |
|
for_each_possible_cpu(i) { |
|
pr = per_cpu(processors, i); |
|
if (!pr) { |
|
/* Look only at processors in ACPI namespace */ |
|
continue; |
|
} |
|
|
|
if (pr->performance) { |
|
retval = -EBUSY; |
|
goto err_out; |
|
} |
|
|
|
if (!performance || !per_cpu_ptr(performance, i)) { |
|
retval = -EINVAL; |
|
goto err_out; |
|
} |
|
} |
|
|
|
/* Call _PSD for all CPUs */ |
|
for_each_possible_cpu(i) { |
|
pr = per_cpu(processors, i); |
|
if (!pr) |
|
continue; |
|
|
|
pr->performance = per_cpu_ptr(performance, i); |
|
pdomain = &(pr->performance->domain_info); |
|
if (acpi_processor_get_psd(pr->handle, pdomain)) { |
|
retval = -EINVAL; |
|
continue; |
|
} |
|
} |
|
if (retval) |
|
goto err_ret; |
|
|
|
/* |
|
* Now that we have _PSD data from all CPUs, lets setup P-state |
|
* domain info. |
|
*/ |
|
for_each_possible_cpu(i) { |
|
pr = per_cpu(processors, i); |
|
if (!pr) |
|
continue; |
|
|
|
if (cpumask_test_cpu(i, covered_cpus)) |
|
continue; |
|
|
|
pdomain = &(pr->performance->domain_info); |
|
cpumask_set_cpu(i, pr->performance->shared_cpu_map); |
|
cpumask_set_cpu(i, covered_cpus); |
|
if (pdomain->num_processors <= 1) |
|
continue; |
|
|
|
/* Validate the Domain info */ |
|
count_target = pdomain->num_processors; |
|
if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL) |
|
pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; |
|
else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL) |
|
pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW; |
|
else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY) |
|
pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY; |
|
|
|
for_each_possible_cpu(j) { |
|
if (i == j) |
|
continue; |
|
|
|
match_pr = per_cpu(processors, j); |
|
if (!match_pr) |
|
continue; |
|
|
|
match_pdomain = &(match_pr->performance->domain_info); |
|
if (match_pdomain->domain != pdomain->domain) |
|
continue; |
|
|
|
/* Here i and j are in the same domain */ |
|
|
|
if (match_pdomain->num_processors != count_target) { |
|
retval = -EINVAL; |
|
goto err_ret; |
|
} |
|
|
|
if (pdomain->coord_type != match_pdomain->coord_type) { |
|
retval = -EINVAL; |
|
goto err_ret; |
|
} |
|
|
|
cpumask_set_cpu(j, covered_cpus); |
|
cpumask_set_cpu(j, pr->performance->shared_cpu_map); |
|
} |
|
|
|
for_each_possible_cpu(j) { |
|
if (i == j) |
|
continue; |
|
|
|
match_pr = per_cpu(processors, j); |
|
if (!match_pr) |
|
continue; |
|
|
|
match_pdomain = &(match_pr->performance->domain_info); |
|
if (match_pdomain->domain != pdomain->domain) |
|
continue; |
|
|
|
match_pr->performance->shared_type = |
|
pr->performance->shared_type; |
|
cpumask_copy(match_pr->performance->shared_cpu_map, |
|
pr->performance->shared_cpu_map); |
|
} |
|
} |
|
|
|
err_ret: |
|
for_each_possible_cpu(i) { |
|
pr = per_cpu(processors, i); |
|
if (!pr || !pr->performance) |
|
continue; |
|
|
|
/* Assume no coordination on any error parsing domain info */ |
|
if (retval) { |
|
cpumask_clear(pr->performance->shared_cpu_map); |
|
cpumask_set_cpu(i, pr->performance->shared_cpu_map); |
|
pr->performance->shared_type = CPUFREQ_SHARED_TYPE_NONE; |
|
} |
|
pr->performance = NULL; /* Will be set for real in register */ |
|
} |
|
|
|
err_out: |
|
mutex_unlock(&performance_mutex); |
|
free_cpumask_var(covered_cpus); |
|
return retval; |
|
} |
|
EXPORT_SYMBOL(acpi_processor_preregister_performance); |
|
|
|
int |
|
acpi_processor_register_performance(struct acpi_processor_performance |
|
*performance, unsigned int cpu) |
|
{ |
|
struct acpi_processor *pr; |
|
|
|
if (!acpi_processor_cpufreq_init) |
|
return -EINVAL; |
|
|
|
mutex_lock(&performance_mutex); |
|
|
|
pr = per_cpu(processors, cpu); |
|
if (!pr) { |
|
mutex_unlock(&performance_mutex); |
|
return -ENODEV; |
|
} |
|
|
|
if (pr->performance) { |
|
mutex_unlock(&performance_mutex); |
|
return -EBUSY; |
|
} |
|
|
|
WARN_ON(!performance); |
|
|
|
pr->performance = performance; |
|
|
|
if (acpi_processor_get_performance_info(pr)) { |
|
pr->performance = NULL; |
|
mutex_unlock(&performance_mutex); |
|
return -EIO; |
|
} |
|
|
|
mutex_unlock(&performance_mutex); |
|
return 0; |
|
} |
|
|
|
EXPORT_SYMBOL(acpi_processor_register_performance); |
|
|
|
void acpi_processor_unregister_performance(unsigned int cpu) |
|
{ |
|
struct acpi_processor *pr; |
|
|
|
mutex_lock(&performance_mutex); |
|
|
|
pr = per_cpu(processors, cpu); |
|
if (!pr) { |
|
mutex_unlock(&performance_mutex); |
|
return; |
|
} |
|
|
|
if (pr->performance) |
|
kfree(pr->performance->states); |
|
pr->performance = NULL; |
|
|
|
mutex_unlock(&performance_mutex); |
|
|
|
return; |
|
} |
|
|
|
EXPORT_SYMBOL(acpi_processor_unregister_performance);
|
|
|