![Thomas Renninger](/assets/img/avatar_default.png)
Signed-off-by: Thomas Renninger <trenn@suse.de> Cc: Andi Kleen <andi@firstfloor.org> Cc: Len Brown <lenb@kernel.org> Cc: Dave Jones <davej@codemonkey.org.uk> Cc: Ingo Molnar <mingo@elte.hu> Cc: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
798 lines
19 KiB
C
798 lines
19 KiB
C
/*
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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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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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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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#ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/mutex.h>
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#include <asm/uaccess.h>
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#endif
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#include <acpi/acpi_bus.h>
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#include <acpi/processor.h>
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#define ACPI_PROCESSOR_COMPONENT 0x01000000
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#define ACPI_PROCESSOR_CLASS "processor"
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#define ACPI_PROCESSOR_FILE_PERFORMANCE "performance"
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#define _COMPONENT ACPI_PROCESSOR_COMPONENT
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ACPI_MODULE_NAME("processor_perflib");
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static DEFINE_MUTEX(performance_mutex);
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/* Use cpufreq debug layer for _PPC changes. */
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#define cpufreq_printk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_CORE, \
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"cpufreq-core", msg)
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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 unsigned int ignore_ppc = -1;
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module_param(ignore_ppc, uint, 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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#define PPC_REGISTERED 1
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#define PPC_IN_USE 2
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static int acpi_processor_ppc_status;
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static int acpi_processor_ppc_notifier(struct notifier_block *nb,
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unsigned long event, void *data)
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{
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struct cpufreq_policy *policy = data;
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struct acpi_processor *pr;
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unsigned int ppc = 0;
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if (event == CPUFREQ_START && ignore_ppc <= 0) {
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ignore_ppc = 0;
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return 0;
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}
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if (ignore_ppc)
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return 0;
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if (event != CPUFREQ_INCOMPATIBLE)
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return 0;
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mutex_lock(&performance_mutex);
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pr = per_cpu(processors, policy->cpu);
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if (!pr || !pr->performance)
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goto out;
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ppc = (unsigned int)pr->performance_platform_limit;
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if (ppc >= pr->performance->state_count)
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goto out;
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cpufreq_verify_within_limits(policy, 0,
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pr->performance->states[ppc].
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core_frequency * 1000);
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out:
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mutex_unlock(&performance_mutex);
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return 0;
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}
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static struct notifier_block acpi_ppc_notifier_block = {
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.notifier_call = acpi_processor_ppc_notifier,
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};
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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 ppc = 0;
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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_status |= PPC_IN_USE;
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if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
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ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC"));
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return -ENODEV;
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}
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cpufreq_printk("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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return 0;
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}
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int acpi_processor_ppc_has_changed(struct acpi_processor *pr)
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{
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int ret;
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if (ignore_ppc)
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return 0;
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ret = acpi_processor_get_platform_limit(pr);
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if (ret < 0)
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return (ret);
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else
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return cpufreq_update_policy(pr->id);
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}
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void acpi_processor_ppc_init(void)
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{
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if (!cpufreq_register_notifier
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(&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
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acpi_processor_ppc_status |= PPC_REGISTERED;
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else
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printk(KERN_DEBUG
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"Warning: Processor Platform Limit not supported.\n");
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}
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void acpi_processor_ppc_exit(void)
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{
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if (acpi_processor_ppc_status & PPC_REGISTERED)
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cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
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CPUFREQ_POLICY_NOTIFIER);
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acpi_processor_ppc_status &= ~PPC_REGISTERED;
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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_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
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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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printk(KERN_ERR PREFIX "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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printk(KERN_ERR PREFIX "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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printk(KERN_ERR PREFIX "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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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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status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
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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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printk(KERN_ERR PREFIX "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_DEBUG_PRINT((ACPI_DB_INFO, "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(sizeof(struct acpi_processor_px) * pss->package.count,
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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_DEBUG_PRINT((ACPI_DB_INFO, "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_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
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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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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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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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if (!px->core_frequency) {
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printk(KERN_ERR PREFIX
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"Invalid _PSS data: freq is zero\n");
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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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}
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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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static 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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acpi_status status = AE_OK;
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acpi_handle handle = NULL;
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if (!pr || !pr->performance || !pr->handle)
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return -EINVAL;
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status = acpi_get_handle(pr->handle, "_PCT", &handle);
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if (ACPI_FAILURE(status)) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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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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return result;
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result = acpi_processor_get_performance_states(pr);
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if (result)
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return result;
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return 0;
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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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acpi_status status;
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static int is_done = 0;
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if (!(acpi_processor_ppc_status & PPC_REGISTERED))
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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 occured,
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* and to postitive if _no_ error occured, 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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/* Can't write pstate_control to smi_command if either value is zero */
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if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "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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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"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_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status,
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"Failed to write pstate_control [0x%x] to "
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"smi_command [0x%x]", acpi_gbl_FADT.pstate_control,
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acpi_gbl_FADT.smi_command));
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module_put(calling_module);
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return status;
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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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if (!(acpi_processor_ppc_status & 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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#ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF
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/* /proc/acpi/processor/../performance interface (DEPRECATED) */
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static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file);
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static struct file_operations acpi_processor_perf_fops = {
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.owner = THIS_MODULE,
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.open = acpi_processor_perf_open_fs,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static int acpi_processor_perf_seq_show(struct seq_file *seq, void *offset)
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{
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struct acpi_processor *pr = seq->private;
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int i;
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if (!pr)
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goto end;
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if (!pr->performance) {
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seq_puts(seq, "<not supported>\n");
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goto end;
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}
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seq_printf(seq, "state count: %d\n"
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"active state: P%d\n",
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pr->performance->state_count, pr->performance->state);
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seq_puts(seq, "states:\n");
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for (i = 0; i < pr->performance->state_count; i++)
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seq_printf(seq,
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" %cP%d: %d MHz, %d mW, %d uS\n",
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(i == pr->performance->state ? '*' : ' '), i,
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(u32) pr->performance->states[i].core_frequency,
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(u32) pr->performance->states[i].power,
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(u32) pr->performance->states[i].transition_latency);
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end:
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return 0;
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}
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static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file)
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{
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return single_open(file, acpi_processor_perf_seq_show,
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PDE(inode)->data);
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}
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static void acpi_cpufreq_add_file(struct acpi_processor *pr)
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{
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struct acpi_device *device = NULL;
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if (acpi_bus_get_device(pr->handle, &device))
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return;
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/* add file 'performance' [R/W] */
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proc_create_data(ACPI_PROCESSOR_FILE_PERFORMANCE, S_IFREG | S_IRUGO,
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acpi_device_dir(device),
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&acpi_processor_perf_fops, acpi_driver_data(device));
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return;
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}
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static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
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{
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struct acpi_device *device = NULL;
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if (acpi_bus_get_device(pr->handle, &device))
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return;
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/* remove file 'performance' */
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remove_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
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acpi_device_dir(device));
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return;
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}
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#else
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static void acpi_cpufreq_add_file(struct acpi_processor *pr)
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{
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return;
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}
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static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
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{
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return;
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}
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#endif /* CONFIG_X86_ACPI_CPUFREQ_PROC_INTF */
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static int acpi_processor_get_psd(struct acpi_processor *pr)
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{
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int result = 0;
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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;
|
|
struct acpi_psd_package *pdomain;
|
|
|
|
status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
|
|
if (ACPI_FAILURE(status)) {
|
|
return -ENODEV;
|
|
}
|
|
|
|
psd = buffer.pointer;
|
|
if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
|
|
result = -EFAULT;
|
|
goto end;
|
|
}
|
|
|
|
if (psd->package.count != 1) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
|
|
result = -EFAULT;
|
|
goto end;
|
|
}
|
|
|
|
pdomain = &(pr->performance->domain_info);
|
|
|
|
state.length = sizeof(struct acpi_psd_package);
|
|
state.pointer = pdomain;
|
|
|
|
status = acpi_extract_package(&(psd->package.elements[0]),
|
|
&format, &state);
|
|
if (ACPI_FAILURE(status)) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
|
|
result = -EFAULT;
|
|
goto end;
|
|
}
|
|
|
|
if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:num_entries\n"));
|
|
result = -EFAULT;
|
|
goto end;
|
|
}
|
|
|
|
if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:revision\n"));
|
|
result = -EFAULT;
|
|
goto end;
|
|
}
|
|
|
|
end:
|
|
kfree(buffer.pointer);
|
|
return result;
|
|
}
|
|
|
|
int acpi_processor_preregister_performance(
|
|
struct acpi_processor_performance *performance)
|
|
{
|
|
int count, count_target;
|
|
int retval = 0;
|
|
unsigned int i, j;
|
|
cpumask_t covered_cpus;
|
|
struct acpi_processor *pr;
|
|
struct acpi_psd_package *pdomain;
|
|
struct acpi_processor *match_pr;
|
|
struct acpi_psd_package *match_pdomain;
|
|
|
|
mutex_lock(&performance_mutex);
|
|
|
|
retval = 0;
|
|
|
|
/* Call _PSD for all CPUs */
|
|
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;
|
|
continue;
|
|
}
|
|
|
|
if (!performance || !percpu_ptr(performance, i)) {
|
|
retval = -EINVAL;
|
|
continue;
|
|
}
|
|
|
|
pr->performance = percpu_ptr(performance, i);
|
|
cpu_set(i, pr->performance->shared_cpu_map);
|
|
if (acpi_processor_get_psd(pr)) {
|
|
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;
|
|
|
|
/* Basic validity check for domain info */
|
|
pdomain = &(pr->performance->domain_info);
|
|
if ((pdomain->revision != ACPI_PSD_REV0_REVISION) ||
|
|
(pdomain->num_entries != ACPI_PSD_REV0_ENTRIES)) {
|
|
retval = -EINVAL;
|
|
goto err_ret;
|
|
}
|
|
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) {
|
|
retval = -EINVAL;
|
|
goto err_ret;
|
|
}
|
|
}
|
|
|
|
cpus_clear(covered_cpus);
|
|
for_each_possible_cpu(i) {
|
|
pr = per_cpu(processors, i);
|
|
if (!pr)
|
|
continue;
|
|
|
|
if (cpu_isset(i, covered_cpus))
|
|
continue;
|
|
|
|
pdomain = &(pr->performance->domain_info);
|
|
cpu_set(i, pr->performance->shared_cpu_map);
|
|
cpu_set(i, covered_cpus);
|
|
if (pdomain->num_processors <= 1)
|
|
continue;
|
|
|
|
/* Validate the Domain info */
|
|
count_target = pdomain->num_processors;
|
|
count = 1;
|
|
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;
|
|
}
|
|
|
|
cpu_set(j, covered_cpus);
|
|
cpu_set(j, pr->performance->shared_cpu_map);
|
|
count++;
|
|
}
|
|
|
|
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;
|
|
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) {
|
|
cpus_clear(pr->performance->shared_cpu_map);
|
|
cpu_set(i, pr->performance->shared_cpu_map);
|
|
pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
|
|
}
|
|
pr->performance = NULL; /* Will be set for real in register */
|
|
}
|
|
|
|
mutex_unlock(&performance_mutex);
|
|
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_ppc_status & PPC_REGISTERED))
|
|
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;
|
|
}
|
|
|
|
acpi_cpufreq_add_file(pr);
|
|
|
|
mutex_unlock(&performance_mutex);
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL(acpi_processor_register_performance);
|
|
|
|
void
|
|
acpi_processor_unregister_performance(struct acpi_processor_performance
|
|
*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;
|
|
|
|
acpi_cpufreq_remove_file(pr);
|
|
|
|
mutex_unlock(&performance_mutex);
|
|
|
|
return;
|
|
}
|
|
|
|
EXPORT_SYMBOL(acpi_processor_unregister_performance);
|