![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
667 lines
16 KiB
C
667 lines
16 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 <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_DRIVER_NAME "ACPI Processor Driver"
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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 ("acpi_processor")
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static DECLARE_MUTEX(performance_sem);
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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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#define PPC_REGISTERED 1
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#define PPC_IN_USE 2
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static int acpi_processor_ppc_status = 0;
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static int acpi_processor_ppc_notifier(struct notifier_block *nb,
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unsigned long event,
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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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down(&performance_sem);
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if (event != CPUFREQ_INCOMPATIBLE)
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goto out;
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pr = 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)
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goto out;
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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].core_frequency * 1000);
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out:
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up(&performance_sem);
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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
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acpi_processor_get_platform_limit (
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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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ACPI_FUNCTION_TRACE("acpi_processor_get_platform_limit");
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if (!pr)
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return_VALUE(-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_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PPC\n"));
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return_VALUE(-ENODEV);
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}
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pr->performance_platform_limit = (int) ppc;
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return_VALUE(0);
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}
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int acpi_processor_ppc_has_changed(
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struct acpi_processor *pr)
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{
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int 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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if (!cpufreq_register_notifier(&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 "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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if (acpi_processor_ppc_status & PPC_REGISTERED)
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cpufreq_unregister_notifier(&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER);
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acpi_processor_ppc_status &= ~PPC_REGISTERED;
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}
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/*
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* when registering a cpufreq driver with this ACPI processor driver, the
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* _PCT and _PSS structures are read out and written into struct
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* acpi_processor_performance.
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*/
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static int acpi_processor_set_pdc (struct acpi_processor *pr)
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{
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acpi_status status = AE_OK;
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u32 arg0_buf[3];
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union acpi_object arg0 = {ACPI_TYPE_BUFFER};
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struct acpi_object_list no_object = {1, &arg0};
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struct acpi_object_list *pdc;
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ACPI_FUNCTION_TRACE("acpi_processor_set_pdc");
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arg0.buffer.length = 12;
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arg0.buffer.pointer = (u8 *) arg0_buf;
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arg0_buf[0] = ACPI_PDC_REVISION_ID;
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arg0_buf[1] = 0;
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arg0_buf[2] = 0;
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pdc = (pr->performance->pdc) ? pr->performance->pdc : &no_object;
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status = acpi_evaluate_object(pr->handle, "_PDC", pdc, NULL);
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if ((ACPI_FAILURE(status)) && (pr->performance->pdc))
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Error evaluating _PDC, using legacy perf. control...\n"));
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return_VALUE(status);
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}
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static int
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acpi_processor_get_performance_control (
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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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ACPI_FUNCTION_TRACE("acpi_processor_get_performance_control");
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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_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PCT\n"));
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return_VALUE(-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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ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "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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ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
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"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, 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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ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
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"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, sizeof(struct acpi_pct_register));
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end:
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acpi_os_free(buffer.pointer);
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return_VALUE(result);
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}
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static int
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acpi_processor_get_performance_states (
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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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ACPI_FUNCTION_TRACE("acpi_processor_get_performance_states");
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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_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PSS\n"));
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return_VALUE(-ENODEV);
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}
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pss = (union acpi_object *) buffer.pointer;
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if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "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 = kmalloc(sizeof(struct acpi_processor_px) * pss->package.count, 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_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSS data\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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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,
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(u32) px->status));
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if (!px->core_frequency) {
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "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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acpi_os_free(buffer.pointer);
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return_VALUE(result);
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}
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static int
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acpi_processor_get_performance_info (
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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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ACPI_FUNCTION_TRACE("acpi_processor_get_performance_info");
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if (!pr || !pr->performance || !pr->handle)
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return_VALUE(-EINVAL);
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acpi_processor_set_pdc(pr);
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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_VALUE(-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_VALUE(result);
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result = acpi_processor_get_performance_states(pr);
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if (result)
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return_VALUE(result);
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result = acpi_processor_get_platform_limit(pr);
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if (result)
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return_VALUE(result);
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return_VALUE(0);
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}
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int acpi_processor_notify_smm(struct module *calling_module) {
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acpi_status status;
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static int is_done = 0;
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ACPI_FUNCTION_TRACE("acpi_processor_notify_smm");
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if (!(acpi_processor_ppc_status & PPC_REGISTERED))
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return_VALUE(-EBUSY);
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if (!try_module_get(calling_module))
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return_VALUE(-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_VALUE(0);
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}
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else if (is_done < 0) {
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module_put(calling_module);
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return_VALUE(is_done);
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}
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is_done = -EIO;
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/* Can't write pstate_cnt to smi_cmd if either value is zero */
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if ((!acpi_fadt.smi_cmd) ||
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(!acpi_fadt.pstate_cnt)) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"No SMI port or pstate_cnt\n"));
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module_put(calling_module);
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return_VALUE(0);
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}
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Writing pstate_cnt [0x%x] to smi_cmd [0x%x]\n", acpi_fadt.pstate_cnt, acpi_fadt.smi_cmd));
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/* FADT v1 doesn't support pstate_cnt, many BIOS vendors use
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* it anyway, so we need to support it... */
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if (acpi_fadt_is_v1) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Using v1.0 FADT reserved value for pstate_cnt\n"));
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}
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status = acpi_os_write_port (acpi_fadt.smi_cmd,
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(u32) acpi_fadt.pstate_cnt, 8);
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if (ACPI_FAILURE (status)) {
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
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"Failed to write pstate_cnt [0x%x] to "
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"smi_cmd [0x%x]\n", acpi_fadt.pstate_cnt, acpi_fadt.smi_cmd));
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module_put(calling_module);
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return_VALUE(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_VALUE(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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.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 = (struct acpi_processor *)seq->private;
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int i;
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ACPI_FUNCTION_TRACE("acpi_processor_perf_seq_show");
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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,
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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, " %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_VALUE(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 ssize_t
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acpi_processor_write_performance (
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struct file *file,
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const char __user *buffer,
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size_t count,
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loff_t *data)
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{
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int result = 0;
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struct seq_file *m = (struct seq_file *) file->private_data;
|
|
struct acpi_processor *pr = (struct acpi_processor *) m->private;
|
|
struct acpi_processor_performance *perf;
|
|
char state_string[12] = {'\0'};
|
|
unsigned int new_state = 0;
|
|
struct cpufreq_policy policy;
|
|
|
|
ACPI_FUNCTION_TRACE("acpi_processor_write_performance");
|
|
|
|
if (!pr || (count > sizeof(state_string) - 1))
|
|
return_VALUE(-EINVAL);
|
|
|
|
perf = pr->performance;
|
|
if (!perf)
|
|
return_VALUE(-EINVAL);
|
|
|
|
if (copy_from_user(state_string, buffer, count))
|
|
return_VALUE(-EFAULT);
|
|
|
|
state_string[count] = '\0';
|
|
new_state = simple_strtoul(state_string, NULL, 0);
|
|
|
|
if (new_state >= perf->state_count)
|
|
return_VALUE(-EINVAL);
|
|
|
|
cpufreq_get_policy(&policy, pr->id);
|
|
|
|
policy.cpu = pr->id;
|
|
policy.min = perf->states[new_state].core_frequency * 1000;
|
|
policy.max = perf->states[new_state].core_frequency * 1000;
|
|
|
|
result = cpufreq_set_policy(&policy);
|
|
if (result)
|
|
return_VALUE(result);
|
|
|
|
return_VALUE(count);
|
|
}
|
|
|
|
static void
|
|
acpi_cpufreq_add_file (
|
|
struct acpi_processor *pr)
|
|
{
|
|
struct proc_dir_entry *entry = NULL;
|
|
struct acpi_device *device = NULL;
|
|
|
|
ACPI_FUNCTION_TRACE("acpi_cpufreq_addfile");
|
|
|
|
if (acpi_bus_get_device(pr->handle, &device))
|
|
return_VOID;
|
|
|
|
/* add file 'performance' [R/W] */
|
|
entry = create_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
|
|
S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device));
|
|
if (!entry)
|
|
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
|
|
"Unable to create '%s' fs entry\n",
|
|
ACPI_PROCESSOR_FILE_PERFORMANCE));
|
|
else {
|
|
entry->proc_fops = &acpi_processor_perf_fops;
|
|
entry->proc_fops->write = acpi_processor_write_performance;
|
|
entry->data = acpi_driver_data(device);
|
|
entry->owner = THIS_MODULE;
|
|
}
|
|
return_VOID;
|
|
}
|
|
|
|
static void
|
|
acpi_cpufreq_remove_file (
|
|
struct acpi_processor *pr)
|
|
{
|
|
struct acpi_device *device = NULL;
|
|
|
|
ACPI_FUNCTION_TRACE("acpi_cpufreq_addfile");
|
|
|
|
if (acpi_bus_get_device(pr->handle, &device))
|
|
return_VOID;
|
|
|
|
/* remove file 'performance' */
|
|
remove_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
|
|
acpi_device_dir(device));
|
|
|
|
return_VOID;
|
|
}
|
|
|
|
#else
|
|
static void acpi_cpufreq_add_file (struct acpi_processor *pr) { return; }
|
|
static void acpi_cpufreq_remove_file (struct acpi_processor *pr) { return; }
|
|
#endif /* CONFIG_X86_ACPI_CPUFREQ_PROC_INTF */
|
|
|
|
|
|
int
|
|
acpi_processor_register_performance (
|
|
struct acpi_processor_performance * performance,
|
|
unsigned int cpu)
|
|
{
|
|
struct acpi_processor *pr;
|
|
|
|
ACPI_FUNCTION_TRACE("acpi_processor_register_performance");
|
|
|
|
if (!(acpi_processor_ppc_status & PPC_REGISTERED))
|
|
return_VALUE(-EINVAL);
|
|
|
|
down(&performance_sem);
|
|
|
|
pr = processors[cpu];
|
|
if (!pr) {
|
|
up(&performance_sem);
|
|
return_VALUE(-ENODEV);
|
|
}
|
|
|
|
if (pr->performance) {
|
|
up(&performance_sem);
|
|
return_VALUE(-EBUSY);
|
|
}
|
|
|
|
pr->performance = performance;
|
|
|
|
if (acpi_processor_get_performance_info(pr)) {
|
|
pr->performance = NULL;
|
|
up(&performance_sem);
|
|
return_VALUE(-EIO);
|
|
}
|
|
|
|
acpi_cpufreq_add_file(pr);
|
|
|
|
up(&performance_sem);
|
|
return_VALUE(0);
|
|
}
|
|
EXPORT_SYMBOL(acpi_processor_register_performance);
|
|
|
|
|
|
void
|
|
acpi_processor_unregister_performance (
|
|
struct acpi_processor_performance * performance,
|
|
unsigned int cpu)
|
|
{
|
|
struct acpi_processor *pr;
|
|
|
|
ACPI_FUNCTION_TRACE("acpi_processor_unregister_performance");
|
|
|
|
down(&performance_sem);
|
|
|
|
pr = processors[cpu];
|
|
if (!pr) {
|
|
up(&performance_sem);
|
|
return_VOID;
|
|
}
|
|
|
|
kfree(pr->performance->states);
|
|
pr->performance = NULL;
|
|
|
|
acpi_cpufreq_remove_file(pr);
|
|
|
|
up(&performance_sem);
|
|
|
|
return_VOID;
|
|
}
|
|
EXPORT_SYMBOL(acpi_processor_unregister_performance);
|