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![Rafael J. Wysocki](/assets/img/avatar_default.png)
Modify acpi_processor_get_platform_limit() to avoid updating its frequency QoS request when the _PPC return value has not changed by comparing that value to the previous _PPC return value stored in the performance_platform_limit field of the struct acpi_processor corresponding to the given CPU. While at it, do the _PPC return value check against the state count earlier, to avoid setting performance_platform_limit to an invalid value, and make acpi_processor_ppc_init() use FREQ_QOS_MAX_DEFAULT_VALUE as the "no limit" frequency QoS for consistency. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
790 lines
19 KiB
C
790 lines
19 KiB
C
// 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 <andrew.grover@intel.com>
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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* Copyright (C) 2004 Dominik Brodowski <linux@brodo.de>
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* Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
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* - Added processor hotplug support
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*/
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#define pr_fmt(fmt) "ACPI: " fmt
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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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s32 qos_value;
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int index;
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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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* _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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index = ppc;
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if (pr->performance_platform_limit == index ||
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ppc >= pr->performance->state_count)
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return 0;
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pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
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index, index ? "is" : "is not");
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pr->performance_platform_limit = index;
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if (unlikely(!freq_qos_request_active(&pr->perflib_req)))
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return 0;
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/*
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* If _PPC returns 0, it means that all of the available states can be
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* used ("no limit").
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*/
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if (index == 0)
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qos_value = FREQ_QOS_MAX_DEFAULT_VALUE;
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else
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qos_value = pr->performance->states[index].core_frequency * 1000;
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ret = freq_qos_update_request(&pr->perflib_req, qos_value);
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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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/*
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* Reset performance_platform_limit in case there is a stale
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* value in it, so as to make it match the "no limit" QoS value
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* below.
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*/
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pr->performance_platform_limit = 0;
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ret = freq_qos_add_request(&policy->constraints,
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&pr->perflib_req, FREQ_QOS_MAX,
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FREQ_QOS_MAX_DEFAULT_VALUE);
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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 || 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.buffer.pointer || obj.type != ACPI_TYPE_BUFFER ||
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obj.buffer.length < sizeof(struct acpi_pct_register)) {
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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.buffer.pointer || obj.type != ACPI_TYPE_BUFFER ||
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obj.buffer.length < sizeof(struct acpi_pct_register)) {
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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) != 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 = 0;
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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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/*
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* is_done is set to negative if an error occurs and to 1 if no error
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* occurrs, but SMM has been notified already. This avoids repeated
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* notification which might lead to unexpected results.
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*/
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if (is_done != 0) {
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if (is_done < 0)
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result = is_done;
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goto out_put;
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}
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result = acpi_processor_pstate_control();
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if (result <= 0) {
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if (result) {
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is_done = result;
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} else {
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pr_debug("No SMI port or pstate_control\n");
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is_done = 1;
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}
|
|
goto out_put;
|
|
}
|
|
|
|
is_done = 1;
|
|
/*
|
|
* Success. If there _PPC, unloading the cpufreq driver would be risky,
|
|
* so disallow it in that case.
|
|
*/
|
|
if (acpi_processor_ppc_in_use)
|
|
return 0;
|
|
|
|
out_put:
|
|
module_put(calling_module);
|
|
return result;
|
|
}
|
|
EXPORT_SYMBOL(acpi_processor_notify_smm);
|
|
|
|
int acpi_processor_get_psd(acpi_handle handle, struct acpi_psd_package *pdomain)
|
|
{
|
|
int result = 0;
|
|
acpi_status status = AE_OK;
|
|
struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
|
|
struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
|
|
struct acpi_buffer state = {0, NULL};
|
|
union acpi_object *psd = NULL;
|
|
|
|
status = acpi_evaluate_object(handle, "_PSD", NULL, &buffer);
|
|
if (ACPI_FAILURE(status)) {
|
|
return -ENODEV;
|
|
}
|
|
|
|
psd = buffer.pointer;
|
|
if (!psd || psd->type != ACPI_TYPE_PACKAGE) {
|
|
pr_err("Invalid _PSD data\n");
|
|
result = -EFAULT;
|
|
goto end;
|
|
}
|
|
|
|
if (psd->package.count != 1) {
|
|
pr_err("Invalid _PSD data\n");
|
|
result = -EFAULT;
|
|
goto end;
|
|
}
|
|
|
|
state.length = sizeof(struct acpi_psd_package);
|
|
state.pointer = pdomain;
|
|
|
|
status = acpi_extract_package(&(psd->package.elements[0]), &format, &state);
|
|
if (ACPI_FAILURE(status)) {
|
|
pr_err("Invalid _PSD data\n");
|
|
result = -EFAULT;
|
|
goto end;
|
|
}
|
|
|
|
if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
|
|
pr_err("Unknown _PSD:num_entries\n");
|
|
result = -EFAULT;
|
|
goto end;
|
|
}
|
|
|
|
if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
|
|
pr_err("Unknown _PSD:revision\n");
|
|
result = -EFAULT;
|
|
goto end;
|
|
}
|
|
|
|
if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
|
|
pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
|
|
pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
|
|
pr_err("Invalid _PSD:coord_type\n");
|
|
result = -EFAULT;
|
|
goto end;
|
|
}
|
|
end:
|
|
kfree(buffer.pointer);
|
|
return result;
|
|
}
|
|
EXPORT_SYMBOL(acpi_processor_get_psd);
|
|
|
|
int acpi_processor_preregister_performance(
|
|
struct acpi_processor_performance __percpu *performance)
|
|
{
|
|
int count_target;
|
|
int retval = 0;
|
|
unsigned int i, j;
|
|
cpumask_var_t covered_cpus;
|
|
struct acpi_processor *pr;
|
|
struct acpi_psd_package *pdomain;
|
|
struct acpi_processor *match_pr;
|
|
struct acpi_psd_package *match_pdomain;
|
|
|
|
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)
|
|
goto unlock;
|
|
|
|
if (pr->performance)
|
|
kfree(pr->performance->states);
|
|
|
|
pr->performance = NULL;
|
|
|
|
unlock:
|
|
mutex_unlock(&performance_mutex);
|
|
}
|
|
EXPORT_SYMBOL(acpi_processor_unregister_performance);
|